US Pat. No. 9,506,222

DRIVE CONTROL METHOD AND SYSTEM FOR OPERATING A HYDRAULIC DRIVEN WORK MACHINE

Volvo Construction Equipm...

15. A travel system for operating a work machine having an open loop, closed center load sensing hydraulic system, the work
machine comprising a hydraulic pump driven by a prime mover, and a hydraulic travel motor having a variable displacement and
being drivable by a hydraulic fluid supplied from the hydraulic pump, wherein the travel motor is provided with a travel motor
control valve which is electrically controlled and the hydraulic pump is provided with a hydraulic pump controller controlling
the hydraulic pump depending on a load signal generated by a travel control valve, wherein the displacement of the travel
motor is continuously adjustable between a maximum displacement and a minimum displacement, and adjustability of the travel
motor's displacement is independent of an actual pressure in the travel motor.

US Pat. No. 9,659,415

APPARATUS FOR WARNING OF OCCURRENCE OF ERROR OF DEVICE

VOLVO CONSTRUCTION EQUIPM...

1. A warning system comprising:
a warning device comprising at least one of a warning sound generator, a warning light generator, and a vibrator;
a display device configured to notify a user of information regarding operating conditions and an error message;
an instrument cluster central processing unit configured to control operations of the display device and the warning device;
a master electronic control unit configured to be connected to the instrument cluster central processing unit through a communication
channel and connected to at least one of the warning light generator, the warning sound generator, and the vibration through
a hardware channel, the master electronic control unit controlling the operation of the warning device using the instrument
cluster central processing unit,

wherein the master electronic control unit comprises:
an abnormality detection module periodically monitoring validity of data through the communication channel and responses of
the warning device and the instrument cluster central processing unit and

an on/off module operating the warning device, and
wherein, when the abnormality detection module detects an abnormality in the validity of data through the communication channel
or in the response of the warning device or the instrument cluster central processing unit, the master electronic control
unit controls the on/off module to directly operate the warning device through the hardware channel.

US Pat. No. 9,067,575

BRAKE SYSTEM AND VEHICLE COMPRISING A BRAKE SYSTEM

Volvo Construction Equipm...

1. A vehicle comprising:
a powertrain; and
a brake system comprising at least one hydraulic pump coupled to a power-take-off unit of the powertrain, wherein the at least
one hydraulic pump is connected to an input fluid conduit and an output fluid conduit using a controllable valve, and a flow
resistance unit is arranged in the output fluid conduit, wherein the controllable valve, is arranged in the input fluid conduit
and the output fluid conduit, the at least one hydraulic pump being adapted to be

selectively coupled into the output fluid conduit when brake torque is requested, and
selectively coupled to at least one hydraulic cylinder, and to provide fluid to the at least one hydraulic cylinder, whenever
no brake torque is requested.

US Pat. No. 9,365,154

METHOD FOR ACTUATING A BRAKE LIGHT OF A HYDRAULIC DRIVEN WORKING MACHINE

Volvo Construction Equipm...

1. A method for actuating a brake light of a hydraulic driven working machine, the machine comprising equipment to detect
a condition of travel including a travel speed sensor, a gear selector switch, a travel direction switch and a travel pedal
pressure sensor, comprising
automatically activating, via the equipment, the brake light via a control circuit depending on a selected gear if the machine
decelerates without a brake pedal being pushed, wherein depending on a selection between at least three different gears the
equipment automatically activates the brake light via the control circuit if a gear greater than a lowest gear of the machine
is selected and the travel direction switch is changed.

US Pat. No. 9,187,879

METHOD FOR CONTROLLING OPERATION OF DUMP FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A method for controlling dump driving for a construction machine including a lower driving structure, an upper swing structure
mounted on the lower driving structure to swing according to an operation of a swing joystick, a cab mounted on the upper
swing structure, and an attachment including a boom fixed to a front end of the upper swing structure to be driven according
to an operation of an attachment joystick, the method comprising:
a first step of setting a semi-auto dumping mode according to an operation of an input device;
a second step of setting a swing direction of the upper swing structure for a dumping work and a boom-up dumping height;
a third step of determining the swing direction of the upper swing structure through determination of whether operation signal
values, which are input to a controller to correspond to an operation amount in the case where the swing joystick is operated
in left and right directions, are larger than predetermined values;

a fourth step of controlling a corresponding swing valve according to the operation signal value of the swing joystick in
the swing direction determined in the third step and driving boom-up according to the operation signal value obtained through
the operation of the swing joystick;

a fifth step of stopping the boom-up driving when the boom-up height reaches a predetermined dumping height, and making the
upper swing structure swing to a dumping position according to the operation signal value of the swing joystick;

a sixth step of driving the corresponding swing valve according to the operation signal value of the swing joystick so that
the upper swing structure swings in an opposite direction to the swing direction of the upper swing structure; and

a seventh step of stopping the boom-up and the swing driving if the operation signal value of the swing joystick is not input.

US Pat. No. 9,334,630

ALL-ROUND HAZARD SENSING DEVICE FOR CONSTRUCTION APPARATUS

VOLVO CONSTRUCTION EQUIPM...

1. An everywhere risk detection apparatus for construction equipment comprising:
an instrumental electronic control unit (IECU) receiving an input of an image from a camera and generating a prevent signal;
and

a vehicle electronic control unit (VECU) including at least one of a first stop controller for generating a control signal
for turning off an engine and outputting the control signal to an engine start on/off device when the prevent signal is input
from the IECU and a second stop controller for generating a control signal for compulsorily intercepting a flow of hydraulic
fluid and outputting the control signal to a hydraulic interception device when the prevent signal is input from the IECU,

wherein the IECU includes at least one of a first signal generator for generating and outputting the prevent signal to the
VECU if a moving object in the image input from the camera is positioned within a set radius (or area) from the equipment
and a second signal generator for generating and outputting the prevent signal to the VECU if a distance between the moving
object in the image input from the camera and the equipment is shorter than a set distance;

wherein the first stop controller or the second stop controller generates the control signal only in the case where a speed
of the equipment is determined to be lower than a set speed, and a case where the speed of the equipment is lower than the
set speed corresponds to any one of a case where a discharge hydraulic flow rate is lower than a set flow rate, a case where
an angle of a joystick is smaller than a set angle, a case where a position value of a forward/backward pedal is smaller than
a set position value, and a case where an input revolutions per minute (RPM) value is smaller than a set value.

US Pat. No. 9,153,800

BATTERY COVER PROVIDED WITH FIRE EXTINGUISHING FUNCTION

VOLVO CONSTRUCTION EQUIPM...

1. A fire-extinguishing battery cover comprising:
a main body including an outer surface and an inner surface opposite to the outer surface, the inner surface configured to
face an interior of a battery case when the fire-extinguishing battery cover is coupled to the battery case;

a side portion extending from an outer edge of the inner surface of the main body;
a fire-extinguishing tank on the inner surface of the main body and configured to store fire-extinguishing fluid therein;
a filling portion extending from the fire-extinguishing tank to the side portion and through the side portion, the filling
portion in fluid communication with the fire-extinguishing tank to convey the fire-extinguishing fluid into the fire-extinguishing
tank; and

a plurality of fluid tubes on the inner surface of the main body and in fluid communication with the fire-extinguishing tank
to distribute the fire-extinguishing fluid stored in the fire-extinguishing tank over the inner surface;

wherein the fire-extinguishing tank and the plurality of fluid tubes are configured to burst when the fire-extinguishing fluid
rises to a predetermined pressure in response to a fire such that the fire-extinguishing fluid is dispersed into the battery
case and onto a battery therein when the fire-extinguishing battery cover is coupled to the battery case.

US Pat. No. 9,428,942

DOOR LOCKING DEVICE AND CONSTRUCTION MACHINE INCLUDING SAME

VOLVO CONSTRUCTION EQUIPM...

1. A door locking device comprising:
a locking device case mounted on a side door;
a manipulation handle rotatably fixed to the case;
a striker mounted on a door frame that openably/closably supports the side door;
a link rotatably fixed to the case and connected at a lower end thereof to a rotary plate that operates in cooperation with
the manipulation handle upon manipulating the manipulation handle; and

a locking unit connected to an upper end of the link so as to be separated from the manipulation handle and mounted on an
inner surface of the side door so as to positioned above the case so that the locking unit is operated in cooperation with
the manipulation handle by the link so as to be locked to or unlocked from the striker when the manipulation handle is manipulated.

US Pat. No. 9,349,532

TURNING JOINT FOR ELECTRIC EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A turning joint for an electric excavator, comprising:
a DC/AC converter positioned at an upper swing structure of the excavator and configured to convert DC electric energy of
an electric energy storage device into AC electric energy;

an upper coil wound around the upper swing structure and configured to transfer an AC component converted by the DC/AC converter
to a lower traveling structure by electromagnetic induction;

a lower coil wound around the lower traveling structure and configured to receive an electromotive force of the AC component
transferred from the upper coil; and

an inverter configured to supply the electromotive force of the AC component transferred from the lower coil to an electric
motor for traveling the lower traveling structure, as power required for operation of the electric motor; and

a power interruption means for supplying the power only when the electric motor for traveling of the lower traveling structure
requires the power by interrupting the power from the DC/AC converter so as to reduce an energy loss.

US Pat. No. 9,255,383

DEVICE FOR FIXING THE HYDRAULIC PIPING OF CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic piping fixing device for a construction machine, including a piping seat weldingly fixed to a boom structure,
a pair of upper and lower clamps having a fixing portion fixed onto the piping seat and arc-shaped grooves symmetrically formed
on the left and right sides of the fixing portion to support hydraulic piping arranged on the boom structure, and a fastening
member configured to securely fix the fixing portion of the upper and lower clamps to the piping seat, the hydraulic piping
fixing device comprising:
a hydraulic piping fixing plate mounted on the piping seat;
a connector configured to joint-connect a main piping that is connected to a main control valve mounted on an upper swing
structure and a hydraulic piping that is arranged on the boom structure; and

a bolt and a nut configured to securely fix the connector to the hydraulic piping fixing plate;
whereby when the fastening member is loosened due to vibration occurring during work, the hydraulic piping are prevented from
drooping by the connector fixed to the hydraulic piping fixing plate.

US Pat. No. 9,085,875

HYDRAULIC CONTROL VALVE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic control valve for a construction machine that controls hydraulic fluid supplied to a hydraulic cylinder to
drive a working device, the hydraulic control valve comprising:
a valve block comprising:
an inlet port; and
an outlet port configured to communicate with the inlet port;
a check valve configured to open and close an intersection portion of a first path communicating with the inlet port and a
second path communicating with the outlet port, wherein the check valve comprises:

a first throttling portion configured to
permit a flow of the hydraulic fluid from the inlet port to the outlet port, and
variably control a flow of the hydraulic fluid from the outlet port to the inlet port;
a spool slidably coupled to the valve block, and comprising a second throttling portion configured to variably control the
flow of the hydraulic fluid from the outlet port to the inlet port through the check, wherein the check valve is configured
to be opened when the spool is shifted by pilot signal pressure; and

a third throttling portion disposed in the check valve, and configured to
variably control the flow of the hydraulic fluid from the outlet port to the inlet port, and
control the hydraulic fluid that flows from the second path to the first path to correspond to an amount of spool shift of
the spool.

US Pat. No. 9,347,360

STRUCTURE FOR PREVENTING HEAT OF MUFFLER FOR CONSTRUCTION MACHINE FROM BEING DIFFUSED

VOLVO CONSTRUCTION EQUIPM...

1. A structure for preventing the diffusion of heat generated from a muffler mounted inside an engine room of a construction
machine, comprising:
a plurality of frames mounted on a bottom of the engine room at an outside of the muffler;
a shielding film supported by the frames to surround an outer wall of the muffler to define a shielding area in the engine
room; and

a detachable means formed at one side of the shielding film.

US Pat. No. 9,400,003

HYDRAULIC PUMP CONTROL SYSTEM FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic pump control system for a construction machine for minimizing hydraulic fluid flow loss when an upper swivel
body of the construction machine is made to swivel abruptly, comprising:
a variable displacement hydraulic pump and a pilot pump, which are connected to an engine;
a swing motor connected to and driven by the hydraulic pump;
a control spool along a center bypass path of the hydraulic pump, the control spool configured to shift to control a start,
a stop, and a direction change of the swing motor;

a remote control valve configured to supply a pilot signal pressure to the control spool to shift the control spool and drive
the swing motor;

an orifice installed on a lowermost stream side of the center bypass path to generate a negative signal pressure;
a regulator configured to: receive the negative signal pressure generated by the orifice; and control a swivel angle of a
swash plate of the hydraulic pump to control a discharge flow rate of the hydraulic pump;

a swing manipulation signal detector configured to: detect a swing manipulation signal output from the remote control valve;
and output a detection signal based on the swing manipulation signal;

a control unit configured: to receive the detection signal from the swing manipulation signal detector; and output a control
signal to the regulator based on the detection signal, the control signal configured to reduce the discharge flow rate of
the hydraulic pump;

an electro proportional pressure reducing valve configured to generate a secondary pressure proportionate to the detection
signal;

a shuttle valve including: a first input connected to the orifice for receipt of the negative signal pressure; a second input
connected to the electro proportional pressure reducing valve for receipt of the secondary pressure; and

an output connected to the regulator;
wherein:
if the detection signal is greater than a predetermined change rate, or if a predicted discharge flow rate of the hydraulic
pump based on the detection signal is greater than the predetermined change rate, the control unit outputs the control signal
to the electro proportional pressure reducing valve so that the discharge flow rate of the hydraulic pump is limited to the
predetermined change rate, thereby reducing the flow rate of hydraulic fluid supplied to the swing motor from a time point
when the upper swivel body starts to swing after detection of the swing manipulation signal, to when the upper swivel body
is accelerated in order to minimize hydraulic fluid flow loss; and

the shuttle valve is configured to supply the higher one of the negative signal pressure versus the secondary pressure to
the regulator to control the discharge flow rate of the hydraulic pump.

US Pat. No. 9,388,779

FUEL SYSTEM FOR AN EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A fuel system for an excavator comprising:
a fuel tank, a water separator, an engine, and fuel supply lines configured to conduct fuel from the fuel tank to the water
separator, from the water separator to the engine, and from the engine back to the fuel tank;

a hand pump included with the water separator, the hand pump configured such that actuation of the hand pump removes water
from the fuel;

a fuel supply pump included with the engine, the fuel supply pump configured to pump fuel from the fuel tank, through the
water separator, and to the engine;

common rail fuel injectors included with the engine and configured to deliver fuel to combustion chambers of the engine;
an injection pump included with the engine and configured to pump fuel to the common rail fuel injectors;
a fuel control unit that is included with the engine and controls the injection pump, the fuel control unit is configured
to: (A) direct fuel from the water separator back to the fuel tank without the fuel flowing to the common rail injectors;
or (B) activate the injection pump to direct fuel from the water separator to the common rail fuel injectors and the combustion
chambers, the fuel is combusted in the combustion chambers and any fuel remaining after combustion is directed back to the
fuel tank;

a pressure sensor included with the engine and configured to input fuel pressure readings to the fuel control unit, the fuel
control unit is configured to control fuel flow to the common rail fuel injectors based on the fuel pressure readings input
to the fuel control unit;

a check valve included with the engine, the check valve is positioned along the fuel supply line exiting the engine to the
fuel tank and is positioned to receive: (A) fuel that the fuel control unit directed to the common rail fuel injectors; and
(B) fuel that the fuel control unit directed around the common rail fuel injectors;

wherein:
the check valve is configured to retain fuel within the engine upstream of the common rail injectors after the engine has
been shut off, the retained fuel having been previously processed by the water separator to remove water therefrom; and

upon restarting of the engine the retained fuel having water already removed therefrom is directed to the common rail injectors
for combustion by the engine, thus making it unnecessary to actuate the hand pump at engine restart to remove water from fuel.

US Pat. No. 9,068,322

DOUBLE CHECK VALVE FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A double check valve for a construction machine comprising:
a hydraulic pump;
a hydraulic cylinder connected to the hydraulic pump to drive a working device;
a control valve installed in a flow path between the hydraulic pump and the hydraulic cylinder and shifted to control a start,
a stop, and a direction change of the hydraulic cylinder;

a pair of pistons installed on one side of a piston cylinder to open and close first flow paths and second flow paths provided
between the control valve and the hydraulic cylinder, provided with plunger ground portions and notch portions, respectively,
and dividedly formed to be shifted in opposite directions to each other when signal pressure that is introduced from any one
of the first and second flow paths acts on check hydraulic pressure portions during temporary descending of the working device;

a pair of check valves of which checking functions are released when the check valves are pressed through the shifting of
the pistons; and

a plunger installed inside the piston cylinder to move the pistons in a checking function release direction of the check valves
while a flow rate of hydraulic fluid, having passed through the notch portions, forms pressure in the plunger ground portions
of the pistons.

US Pat. No. 9,492,788

METHOD FOR DIAGNOSING A SELECTIVE CATALYTIC REDUCTION CATALYST

Volvo Construction Equipm...

1. A method for determining an ammonia (NH3) storage capacity of a selective catalytic reduction (SCR) catalyst of an exhaust
aftertreatment system of an internal combustion engine, wherein the exhaust aftertreatment system comprises a SCR catalyst,
an reductant injector arranged upstream of the SCR catalyst for injecting a reductant into an exhaust gas, and an exhaust
gas sensor arranged downstream of the SCR catalyst, which exhaust gas sensor being cross-sensitive to nitrogen oxide (NOx)
and NH3 present within the exhaust gas leaving the SCR catalyst, wherein the method comprises the steps of:
ensuring that a SCR catalyst NH3 storage level is substantially below a current maximal NH3 storage capacity of the SCR catalyst;
initiating over-injection of reductant by the injector;
stopping reductant injection in response to registering, by the exhaust gas sensor, an increasing NOx+NH3 emission level and
an NOx+NH3 emission level exceeding a predefined threshold value, and when the reduction injection is stopped recording an
output signal of the exhaust gas sensor until an indication of a minimal negligible SCR catalyst NH3 storage level is determined; and

calculating a SCR catalyst NH3 storage capacity on a basis of the recorded output signal, wherein the storage capacity is
calculated by integrating a difference between an estimated or recorded level of nitrogen oxide (NOx) having entered the SCR
catalyst and a recorded level of nitrogen oxide (NOx) having been emitted from the SCR catalyst.

US Pat. No. 9,306,272

DEVICE FOR FIXING A SATELLITE ANTENNA FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for fixing a satellite antenna for a construction machine that is mounted outside a cab to receive a signal
of a satellite receiver installed inside the cab, comprising:
a bracket mounted to the cab and including a first mount portion mounted on an outer surface of the cab, a second mount portion
formed to extend from the first mount portion to be bent, and a third mount portion formed to be bent against the second mount
portion, the bracket mounting a warning lamp to the cab;

a satellite antenna mounted on the second mount portion to receive a satellite signal, the satellite antenna including a pole;
and

a hanger including a tension coil spring movable between an antenna fixing position and a storage position, in the antenna
fixing position a first end of the tension coil spring is coupled to the third mount portion and a second end of the tension
coil spring is coupled to the pole of the satellite antenna to retain the pole in an elastically laid down position away from
the warning lamp to prevent the satellite antenna from shaking and contacting the warning lamp when the machine is being transported
or operated;

a hook groove defined by a side surface of the second mount portion of the bracket, in the storage position of the hanger
the second end of the tension coil spring is seated in the hook groove to prevent the hanger from sliding down and seceding
from the second mount portion due to vibrations generated during working of the construction machine.

US Pat. No. 9,228,599

HYDRAULIC CIRCUIT FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic circuit for construction equipment comprising:
first and second variable displacement hydraulic pumps and a third fixed displacement hydraulic pump connected to an engine;
a first control valve installed in a flow path of the first hydraulic pump and shifted to control hydraulic fluid supplied
to respective hydraulic actuators that drive working devices and a traveling device;

a second control valve installed in a flow path of the second hydraulic pump and shifted to control hydraulic fluid supplied
to respective hydraulic actuators that drive a swing device, a working device, and the traveling device;

a hydraulic motor connected to the third hydraulic pump;
a cooling fan connected to the hydraulic motor to discharge cooling wind to an oil cooler installed in a return flow path
of the first and second hydraulic pumps so as to cool the hydraulic fluid returning to a hydraulic tank;

a temperature sensor detecting a temperature of the hydraulic fluid in the hydraulic tank;
an electric relief valve installed in a discharge flow path of the third hydraulic pump to control a set pressure of the hydraulic
fluid supplied to the hydraulic motor so as to variably control a rotating speed of the cooling fan;

a controller controlling hydraulic pressure that drives the hydraulic motor by varying the set pressure of the electric relief
valve in accordance with a detection signal from the temperature sensor;

a first shuttle valve installed upstream of the first control valve, the first shuttle valve including one input portion connected
to the flow path of the first variable displacement hydraulic pump and the other input portion connected to the discharge
flow path of the third fixed hydraulic pump, and outputting high-pressure hydraulic fluid of the hydraulic fluids of the first
hydraulic pump and the third hydraulic pump;

a second shuttle valve installed upstream of the second control valve, the second shuttle valve including one input portion
connected to the flow path of the second variable displacement hydraulic pump and the other input portion connected to the
discharge flow path of the third fixed hydraulic pump, and outputting high-pressure hydraulic fluid of the hydraulic fluids
of the second variable displacement hydraulic pump and the third fixed hydraulic pump;

a pilot pressure generation device installed in a pilot flow path connected to the output portions of the first and second
shuttle valves and shifted to supply the hydraulic fluid having a relatively high pressure among the hydraulic fluids of the
first to third hydraulic pumps to the first and second control valves as pilot signal pressure; and

a pressure reducing valve installed in the pilot flow path, and shifted to supply the hydraulic fluid having a relatively
high pressure among the hydraulic fluids of the first to third hydraulic pumps to the pilot pressure generation device as
the pilot signal pressure by a set pressure of a valve spring, and shifted to drain the hydraulic fluid to the hydraulic tank
when a load that exceeds the set pressure of the valve spring occurs in the pilot pressure generation device.

US Pat. No. 9,163,383

METHOD FOR CONTROLLING A POWER SOURCE

Volvo Construction Equipm...

29. A working machine comprising a vehicle control system comprising an Electronic Control Unit (ECU) comprising an accelerator
signal converter configured to perform a method for controlling a speed of a power source adapted to drive at least one ground
engaging element of a working machine, the method comprising:
receiving an operator control input from an accelerator pedal, the operator control input being indicative of the control
of the speed of the power source,

receiving a state input indicative of an operating state of the working machine,
determining an operation signal in response to the operator control input and the operating state input the operation signal
controlling the speed of the power source, thereby modifying a relationship between an accelerator pedal angle and the speed
of the power source in order to assist a driver of the working machine when maneuvering the working machine, and

sending the determined operation signal for controlling the speed of the power source accordingly,
providing at least two operation modes comprising at least one specific control mode and selecting one of operation modes
based on the operating state input, wherein the operation signal is determined in at least one specific control mode,

wherein at least two operation modes comprises a standard mode representing a default control of the power source, and wherein
an effect of the operation signal is reduced in a first part of an operation area of the power source in relation to the standard
mode and increased in a second part the operation area of the power source in relation to the standard mode.

US Pat. No. 9,133,600

METHOD FOR SELECTING AN ATTACK POSE FOR A WORKING MACHINE HAVING A BUCKET

Volvo Construction Equipm...

1. Method for selecting an attack pose, when loading piled materials, for a working machine having a bucket, the method comprising:
acquiring three dimensional pile data (P);
generating a set of attack poses;
generating a bucket trajectory through the pile for each attack pose;
for each attack pose in the set of attack poses, calculating a measure of a convexity (CC) of the pile surface for an area
of the pile surface delimited by a bucket width and a vertical projection of the bucket trajectory; and

selecting an attack pose based on the measure of convexity (CC).

US Pat. No. 9,106,011

ELECTRICAL CONNECTION ARRANGEMENT HAVING A FASTENER ABUTTING AN UNCOATED PORTION OF A SLEEVE

Volvo Construction Equipm...

1. Electrical connection arrangement comprising a first member, a second member, and a fastening element, the first member
being made of electrically conductive material provided with a coating layer and a first hole, wherein a sleeve is arranged
in the first hole prior to application of the coating layer, such that the first member is electrically connected to the sleeve,
a head of the fastening element is arranged to abut an uncoated surface portion of the sleeve to provide electrical contact
between the sleeve and the fastening element, and the fastening element is engaged with the second member, such that the fastening
element is electrically connected to the second member, thereby providing an electrical connection between the first member
and the second member.

US Pat. No. 9,656,573

METHOD AND DEVICE FOR SENSORY CONTROL OF HYBRID OPERATION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A hybrid construction machine in which an electric motor is operated by at least one of an electric generator that is driven
by an engine and an energy storage system that stores regenerative energy, the hybrid construction machine comprising:
a motor drive configured to drive the electric motor;
an acceleration sensor configured to sense an acceleration pedal command; and
a controller configured to map the acceleration pedal command to a speed command and to control a traveling unit through the
motor drive during a low speed traveling operation of the machine,

wherein the controller controls acceleration/deceleration of the electric motor based on the mapped speed command, and generates
the regenerative energy in response to the deceleration of the electric motor.

US Pat. No. 9,506,225

ACTUATOR DISPLACEMENT MEASUREMENT SYSTEM IN ELECTRONIC HYDRAULIC SYSTEM OF CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. An actuator displacement measuring system in an electro-hydraulic system for a construction machine, including an electric
motor, a hydraulic pump driven by the electric motor, a hydraulic actuator connected to the hydraulic pump, a load holding
valve installed in a flow path between the hydraulic pump and the actuator, a relief valve installed in a branch flow path
connected in parallel to the flow path, and a controller controlling driving of the electric motor, the actuator displacement
measuring system comprising:
controlling the driving of the electric motor according to a control signal from the controller;
determining whether the electric motor is driven, and if the electric motor is driven, calculating a flow rate of the hydraulic
pump;

determining whether a displacement value of the actuator that is always detected by a detection signal input from a position
detection sensor to the controller deviates from a zero value that is set as a reference position;

determining whether a set pressure value of the relief valve is larger than or equal to a measured pressure value of the hydraulic
system if the actuator displacement value deviates from the set zero value;

setting the actuator displacement value to a previous value if the pressure value of the hydraulic system is larger than or
equal to the pressure value of the relief valve, and calculating the actuator displacement value using a rotating speed of
the electric motor, a sectional area of the actuator, and a supply flow rate of the hydraulic pump if the pressure value of
the hydraulic system is smaller than the pressure value of the relief valve; and

finishing the calculation after storing the actuator displacement value calculated up to now in the controller if a power-off
request of the hydraulic system is input, and moving to an initial stage if the power-off request of the hydraulic system
is not input.

US Pat. No. 9,145,657

SYSTEM FOR CONTROLLING LAND LEVELING WORK WHICH USES AN EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A grading control system for an excavator comprising:
a variable displacement hydraulic pump, at least one hydraulic actuator connected to the hydraulic pump, an attachment including
a boom and an arm driven by the actuator, a control valve installed in a flow path between the hydraulic pump and the actuator
and shifted to drive the actuator, at least one electric joystick, a pressure detection means for detecting pressure generated
in the actuator, a means for setting a working mode, and a controller outputting a control signal for shifting the control
valve;

wherein the grading control system is configured to repeatedly perform the following:
receiving a control signal value through an operation of the joystick, a pressure value of an arm cylinder detected by the
pressure detection means, and information on whether to set the working mode, the pressure detection means including at least
one pressure sensor that detects a hydraulic pressure generated in the head side and the rod side of the arm cylinder and
transmits a detected signal of the hydraulic pressure to the controller;

calculating, by the controller, an external force that is applied to the attachment by the pressure value generated in the
arm cylinder if a grading mode is set;

estimating whether a pose of the arm cylinder is in an arm-in driving state or in an arm-out driving state, depending on the
calculated external force value;

performing a signal process of the control valve through filtering of the pose of the arm; and
calculating, by the controller, operation amounts of the boom and the arm by combining the estimated pose of the arm and the
control signal value according to an operator's operation of the joystick, the operation amounts of the arm and the boom are
determined according to predefined table values based on the estimated pose of the arm and the control signal value of the
joystick, and proceeding to an initial stage.

US Pat. No. 9,133,603

CONSTRUCTION MACHINE CAB HAVING A ROLLOVER PROTECTION STRUCTURE

VOLVO CONSTRUCTION EQUIPM...

1. A cab having a rollover protection structure for a construction machine, comprising:
a front right pole positioned on the front right side of the cab and formed to extend upwardly from a bottom frame;
a front left pole positioned on the front left side of the cab and formed to be spaced apart from the front right pole;
a front upper end lateral pole connecting upper ends of the front right pole and the front left pole to each other;
a first reinforcement member inserted into an upper portion of the front right pole; and
a second reinforcement member inserted into a lower portion of the front left pole;
a third reinforcement member installed in a center of a ceiling portion of the cab and spaced apart from the front upper end
lateral pole;

a lateral cross-sectional area of the third reinforcement member is larger than a lateral cross-sectional area of the front
upper end lateral pole;

wherein:
the first reinforcement member terminates prior to reaching a midpoint of the front right pole and prior to reaching a lower
end of the front right pole, and the second reinforcement member terminates after crossing a midpoint of the front left pole
and prior to reaching an upper end of the front left pole; and

the second reinforcement member having a cross-sectional area that gradually and uniformly decreases in size along a length
of the second reinforcement member in a direction from a lower end of the second reinforcement member to an upper end of the
second reinforcement member, such that the size of the cross-sectional area at any point along the length is directly proportionate
to a distance from the lower end of the second reinforcement member.

US Pat. No. 9,108,670

METHOD FOR CONTROLLING A HYDRAULIC SYSTEM OF A WORKING MACHINE

Volvo Construction Equipm...

1. A method for controlling a hydraulic system of a working machine, the hydraulic system comprising a first hydraulic machine
for providing hydraulic fluid to a first actuator of the working machine, and a second hydraulic machine for providing hydraulic
fluid to a second actuator of the working machine and for providing hydraulic fluid to the first actuator, the method comprising:
using a first control mode, and in the first control mode allowing a flow of hydraulic fluid from the second hydraulic machine
solely to the second actuator and thus no hydraulic flow is allowed from the second hydraulic machine to the first actuator,
the pump pressure of the second hydraulic machine being selected based on the load pressure of the second actuator independently
of the load pressure of the first actuator, and

using a second control mode provided that the requested flow to the first actuator exceeds a predetermined threshold value,
and in the second control mode allowing a flow of hydraulic fluid from the second hydraulic machine to the first actuator,
the pump pressure of the second hydraulic machine being selected based on the highest value of the load pressure of the second
actuator and the load pressure of the first actuator.

US Pat. No. 9,260,144

LOWER TRACK OF CRAWLER EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A lower track of a crawler type excavator, comprising:
a pair of first and second rubber pads which are dividedly formed;
a first steel plate configured to surroundingly support the underside of the first rubber pad, the first steel plate having
one or more first hooks formed on the underside thereof so as to allow one end of a track shoe to be supportingly seated thereon,
and a joint stepped portion having one or more fastening holes formed thereon, the joint stepped portion being formed on an
opposite side of the first hook;

a second steel plate configured to surroundingly support the underside of the second rubber pad, the second steel plate having
one or more second hooks formed on the underside thereof so as to allow the other end of the track shoe to be supportingly
seated thereon, and a joint projection portion having one or more through-holes formed thereon to correspond to the fastening
holes, the joint projection portion being formed on an opposite side of the second hook so as to be seated on the joint stepped
portion; and

one or more fastening members fixedly engaged into the fastening holes of the first steel plate after passing through one
or more through-holes formed in the second rubber pad and the through-holes of the second steel plate in this order,

wherein the track shoe is supported by hooking the first and second hooks on both ends of the track shoe, the first and second
steel plates are assembled into a single unit by superimposing the joint projection portion of the second steel plate on the
corresponding joint stepped portion of the first steel plate, and the first and second rubber pads having the undersides on
which the first and second steel plates are supported are detachably mounted on the track shoe by the fastening members fixedly
engaged into the fastening holes of the first steel plate after passing through the through-holes of the second rubber pad
and the through-holes of the second steel plate.

US Pat. No. 9,309,899

CONTROL DEVICE FOR A HYDRAULIC PUMP OF CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic pump control device for a construction machine including an engine, a variable displacement hydraulic pump
connected to the engine, an operation lever generating a secondary signal pressure in proportion to an operation amount, a
control valve installed in a bypass path of the hydraulic pump to control a flow rate discharged from the hydraulic pump in
accordance with an operation of the operation lever, a hydraulic actuator driven by hydraulic fluid supplied when the control
valve is shifted, an orifice installed on a downstream side of the bypass path to form a negative signal pressure, and a regulator
controlling a discharge flow rate by controlling an inclination angle of a swash plate of the hydraulic pump, the hydraulic
pump control device comprising:
an accumulator storing a signal pressure of pump control;
a solenoid valve movable between a first position and a second position, in the first position the solenoid valve directs
through the solenoid valve signal pressure from the accumulator to the regulator, in the second position the solenoid valve
directs through the solenoid valve the negative signal pressure generated by the orifice to the regulator; and

a safety lever configured to be manually actuated by an operator to apply a solenoid control signal to the solenoid valve
for moving the solenoid valve between the first position and the second position,

wherein movement of the solenoid valve manually by the operator during engine start to the first position to direct signal
pressure from the accumulator to the regulator results in the regulator maintaining the inclination angle of the swash plate
of the hydraulic pump at minimum capacity by compensating for the negative signal pressure; and

the safety lever comprises a switch which is switched on to supply the solenoid control signal to the solenoid valve so that
the solenoid valve is shifted when the safety lever is shifted to a locking position.

US Pat. No. 9,230,761

EMERGENCY STOP SYSTEM FOR A HYBRID EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. An emergency stop system for a hybrid excavator comprising:
an emergency switch notifying of equipment abnormality and emergency situation occurrence;
an emergency stop unit including a first contact which is turned on in a normal operation state to provide an input power
supply to a hybrid controller and an engine controller and is turned off when the emergency switch is pressed to intercept
the input power supply to the hybrid controller and the engine controller, and a second contact which is turned on when the
emergency switch is pressed to provide the input power supply through another path; and

an energy discharge unit connected to the second contact of the emergency stop unit to discharge energy of an energy storage
device by the input power supply applied thereto through the second contact when the input power supply to the hybrid controller
and the engine controller is intercepted;

wherein at least one of an electric motor/generator controller, a swing electric motor controller, a swing electric motor
parking brake, and energy storage device contactors, which are connected to the hybrid controller, interlocks with the input
power supply, and is intercepted when the input power supply to the hybrid controller and the engine controller is intercepted.

US Pat. No. 9,103,355

FLOW CONTROL VALVE FOR CONSTRUCTION MACHINE

Volvo Construction Equipm...

1. A flow control valve for a construction machine, including a valve body in which a supply passage communicating with a
pump passage through which hydraulic fluid from a hydraulic pump is supplied and actuator ports connected to a hydraulic actuator
are formed, and a spool installed in the valve body and shifted to make the supply passage communicate with the actuator ports
so as to supply the hydraulic fluid from the hydraulic pump to the hydraulic actuator through a first actuator port of the
actuator ports and to return the hydraulic fluid discharged from the hydraulic actuator to a tank passage through a second
actuator port of the actuator ports, the flow control valve comprising:
a flow control spool shifted in the spool to variably control the hydraulic fluid that flows to the first actuator port if
a flow rate of the hydraulic fluid that flows through the supply passage is higher than a set flow rate;

a first passage formed on the spool to communicate with the supply passage;
a second passage formed on the spool to communicate with the first actuator port and having a cross-sectional area that is
varied depending on the shifting of the flow control spool;

a first flow control passage formed on the flow control spool to communicate with the first passage;
a second flow control passage formed on the flow control spool to communicate with the second passage;
a third passage formed on the flow control spool to communicate with the first and second flow control passages;
a first signal pressure passage formed on the flow control spool to make the first flow control passage and a pressure chamber
communicate with each other; and

a second signal pressure passage formed on the flow control spool to make the third passage and a back pressure chamber communicate
with each other.

US Pat. No. 9,309,901

FLOW CONTROL VALVE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A flow control valve for a construction machine configured to control hydraulic fluid that is distributed and supplied
from a hydraulic pump to a hydraulic actuator and a swing device, comprising:
a valve block in which a pump path connected to the hydraulic pump and connection ports communicating with the hydraulic actuator
are formed;

a spool slidably installed inside the valve block and shifted according to pilot signal pressure applied thereto to control
hydraulic fluid that is supplied from the pump path connected to the swing device side to the connection port side;

a priority valve mounted on the valve block to limit a flow rate that is supplied from the pump path to the connection port
side when the control spool is shifted according to applied pilot signal pressure of the swing device side; and

a piston slidably installed inside a sleeve that is mounted on the priority valve and shifted according to applied pilot signal
pressure to shift the control spool to a neutral position so as to release the function of limiting the hydraulic fluid that
is supplied from the pump path to the connection port side.

US Pat. No. 9,303,659

METHOD OF CONTROLLING THE FLOW RATE OF A VARIABLE CAPACITY HYDRAULIC PUMP FOR A CONSTRUCTION APPARATUS

VOLVO CONSTRUCTION EQUIPM...

1. A method of controlling a flow rate of a variable displacement hydraulic pump for a construction machine which comprises:
a variable displacement hydraulic pump, a hydraulic actuator connected to the hydraulic pump, a manipulation lever configured
to output a manipulation signal that is in proportion to a manipulation amount of the manipulation lever by a user, a control
valve configured to control a start, a stop, and a direction change of the hydraulic actuator when it is shifted in response
to the manipulation signal outputted from the manipulation lever, a manipulation amount detector configured to detect the
manipulation amount of the manipulation lever and electrically connected to a controller, a discharge pressure detection sensor
configured to detect a pressure of a hydraulic fluid discharged from the hydraulic pump, and a controller configured to control
a discharge flow rate of the hydraulic pump in response to detection signals outputted from the manipulation amount detection
detector and the discharge pressure detection sensor, the method comprising:
a first step of calculating a discharge flow rate of the hydraulic fluid, which is required by the hydraulic pump according
to the manipulation amount of the manipulation lever by a user;

a second step of calculating an allowable discharge flow rate within a range that does not exceed a preset specific horsepower
or torque of the hydraulic pump, relative to the discharge pressure of the hydraulic fluid detected by the discharge pressure
detection sensor; and

a third step of controlling a discharge flow rate of the hydraulic pump in proportion to the manipulation amount of the manipulation
lever within a range of the allowable discharge flow rate value calculated in the second step;

wherein the discharge flow rate of the hydraulic pump is calculated by calculating the discharge flow rate required by the
hydraulic pump according to the manipulation amount of the manipulation lever as a percentage under the no-load condition
and multiplying the allowable discharge flow rate of the hydraulic pump relative to the preset discharge pressure by the calculated
percentage.

US Pat. No. 9,182,263

LEVEL GAUGE

VOLVO CONSTRUCTION EQUIPM...

1. A level gauge that comprises a tube disposed on an engine of a vehicle and a gauge part accommodatably joined to the tube
and configured to check the state of oil contained in the engine,
wherein the tube comprises an air hole formed on an outer circumferential surface thereof so as to allow the air inside the
engine to be discharged to the outside therethrough, and

wherein the gauge part comprises: a sealing member insertingly fitted into an upper end of the tube and configured to hermetically
seal the tube; a hole shield formed integrally with the sealing member and fitted around an outer circumferential surface
of the tube to shield the air hole; and an inspection part joined at one end thereof to one side of the sealing member and
longitudinally extending at the other end thereof to the inside of an oil tank;

wherein the sealing member has a shape corresponding to that of a hollow portion formed on an inner circumferential surface
of the tube and comprises an extension portion formed at the other side thereof;

the air hole is formed on the outer circumferential surface of the tube at a position spaced apart from the one side of the
sealing member fitted into the tube so that the air hole is not shielded by the sealing member when the sealing member is
insertingly fitted into the tube; and

the hole shield is formed integrally with the sealing member in such a manner as to have a cylindrical shape that is connected
at one end thereof to the extension portion of the sealing member and downwardly extends at the other end thereof in juxtaposition
with the outer circumferential surface of the sealing member, so that the hole shield shields the air hole when the sealing
member is insertingly fitted into the tube.

US Pat. No. 9,481,980

DEVICE FOR FIXING A LOWER GLASS FOR A CONSTRUCTION MACHINERY CABIN

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for detachably fixing a glass on a window frame of a cab for a construction machine according to a working
environment, the apparatus comprising:
a lower bracket fixedly installed on a lower side of the window frame;
a knob support plate including
a fixing plate having a guide groove and a position setting hole, and
a support plate extended from the fixing plate and having a compression pad,
wherein the fixing plate is coupled to an upper side of the window frame and the support plate compressively supports one
side of an upper portion of the glass;

an adjustment knob having a projection portion and rotatably coupled to the fixing plate, wherein the projection portion is
fitted into the guide groove to slidably guide a rotation of the adjustment knob on the fixing plate;

a spacer inserted between the fixing plate and the adjustment knob, and configured to provide a predetermined gap between
the fixing plate and the adjustment knob; and

a fixing member extending through the adjustment knob and the spacer, and coupled to the position setting hole to rotatably
couple the adjustment knob to the fixing plate.

US Pat. No. 9,285,015

CONTINUOUSLY VARIABLE TRANSMISSION AND A WORKING MACHINE INCLUDING A CONTINUOUSLY VARIABLE TRANSMISSION

Volvo Construction Equipm...

1. A continuously variable transmission including a variator unit having a variator input shaft and a variator output shaft,
and a first, a second, a third and a fourth planetary gear set, wherein each of the first and second planetary gear sets has
a first member being operatively connected to a common transmission input shaft which common transmission input shaft is common
to the first and second planetary gear sets and a second member being operatively connected to an output shaft which output
shaft is common to the first and second planetary gear sets, each of the first and second planetary gear sets further including
a third member, and the third planetary gear set having a first, a second and a third member, wherein the variator input shaft
is operatively connected to the third member of the second planetary gear set and that the variator output shaft is operatively
connected to the third member of the first planetary gear set, that the first member of the third planetary gear set is operatively
connected to the variator output shaft, that the second member of the third planetary gear set is selectively connectable
to the third member of the second planetary gear set and selectively connectable to a transmission housing, that the third
member of the third planetary gear set is selectively connectable to a transmission output shaft and that a first member of
the fourth planetary gear set being selectively connectable to the output shaft and selectively connectable to the third member
of the third planetary gear set, a second member of the fourth planetary gear set being selectively connectable to the transmission
housing and a third member of the fourth planetary gear set being operatively connected to the transmission output shaft.

US Pat. No. 9,261,114

HYDRAULIC PRESSURE-REGULATING VALVE FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic control valve for controlling hydraulic fluid supplied to an actuator in a construction machine, the hydraulic
control valve comprising:
a mono type valve block;
a boom spool for actuating a boom, the boom spool slidably coupled to the mono type valve block and configured to be shifted
to control the hydraulic fluid supplied from a first hydraulic pump and a second hydraulic pump to the actuator, and comprising
an internal path disposed in an axis direction thereof;

wherein the hydraulic pump comprises a first supply path, and the second hydraulic pump comprises a second supply path, and
wherein the first supply path and the second supply path are vertically symmetrical with respect to each other about an axis
of the boom spool;

first check valves elastically supported, and configured to open or close each of the supply path and the second supply path;
bridge paths disposed to be horizontally and vertically symmetrical with respect to each other about a path disposed on a
sliding surface of the mono type valve block, in which the boom spool is shifted, to supply the hydraulic fluid from the first
supply path and the second supply path to the actuator;

cylinder paths configured to supply the hydraulic fluid from the first hydraulic pump to the actuator when the boom spool
is shifted to a first side to make the cylinder paths communicate with the bridge paths;

a connection path configured to supply the hydraulic fluid from the second hydraulic pump to the internal path of the boom
spool when the boom spool is shifted to the first side to make the connection path communicate with the bridge path; and

a spool land of the boom spool, the spool land configured to clog the bridge paths so that, when the boom spool is shifted
for lowering the boom, the hydraulic fluid of the second hydraulic pump is not supplied to the actuator of the boom,

wherein, only when the boom spool is shifted for lifting up the actuator of the boom, the hydraulic fluids from the first
and second hydraulic pumps are in a confluent state via the bridge paths.

US Pat. No. 9,222,240

APPARATUS FOR PROTECTING COMPONENTS OF AN EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A component protection apparatus for an excavator, which protects internal components of an upper swing structure from
foreign substances including pieces of rocks and stones that fall in a rear of a boom during a scratch work of the excavator,
the apparatus comprising:
an upper frame including a boom base that supports a lower portion of the boom, a left center frame that extends from one
side of the boom base, and a right center frame extending from an opposite side of the boom base;

a left cover support frame installed to extend upwardly from the left center frame;
a right cover support frame installed to extend upwardly from the right center frame; and
a protective cover body detachably installed on the top surfaces of the left and right cover support frames,
wherein the protective cover body includes a fitting part adjacent to a rear portion of the boom, a damping plate that absorbs
an impact during the falling of the foreign substances, and a bottom plate formed on an underside of the damping plate in
such a manner to be contactingly supported on the top surfaces of the left and right cover support frames.

US Pat. No. 9,556,583

AUTOMATIC GRADING SYSTEM FOR CONSTRUCTION MACHINE AND METHOD FOR CONTROLLING THE SAME

VOLVO CONSTRUCTION EQUIPM...

1. An automatic grading system for a construction machine, comprising:
a work apparatus having a boom connected pivotally to one side of a vehicle body, an arm connected pivotally to a front end
portion of the boom, and a bucket connected pivotally to a front end portion of the arm;

a boom angle detection sensor mounted on one side of the boom so as to sense the angular movement of the boom with respect
to the vehicle body;

an arm angle detection sensor mounted on one side of the arm so as to sense the angular movement of the arm with respect to
the boom;

a switch panel on which a standard grading mode switch, a grading history storage switch, and a history grading mode switch
selected for a grading work are disposed;

an electronic control unit adapted to receive grade input signals applied from the angle detection sensors at the time when
the grading mode switches and a joystick for controlling the work apparatus are manipulated and to calculate the grade input
signals in accordance with a predetermined control algorithm to output grade control signals for controlling the angular movements
of the boom, arm and bucket, so that the angular movement of the bucket is fixed to a given starting angle from an initial
grading position to a final grading position and the angular movements of the boom and arm are determined as variable angles
to maintain the given starting angle; and

work apparatus control valves adapted to control the hydraulic pressures for driving a boom cylinder, an arm cylinder and
a bucket cylinder in response to the grade control signals; and

a swing angle detection sensor mounted on one side of the vehicle body; wherein:
when the standard grading mode switch is turned on, the boom, arm, and bucket are moved to an initial grading area and the
angular movement of the bucket is fixed to a given starting angle; and

when the history grading mode switch is manipulated, the grade control signals determined by the angular movements of the
boom, arm, and bucket within the initial grading area from the initial grading position to the final grading position are
recorded as grading history data in the electronic control unit, and through the grading history data the work apparatus is
repeatedly operated in a continuous grading area from the initial grading area.

US Pat. No. 9,242,633

METHOD AND A CONTROL SYSTEM FOR CONTROLLING A WORK MACHINE

Volvo Construction Equipm...

1. A method for controlling a hybrid work machine during operation in a repeated work cycle of the work machine, the hybrid
work machine comprising an energy storage means and a power consuming system, the power consuming system comprising a powertrain
for propelling the work machine and as system for moving a work implement of the work machine, the work cycle comprising a
route of the work machine and a movement of the implement, the method comprising
controlling transfer of power from the energy storage means to the power consuming system and from the power consuming system
to the energy storage means in the work machine according to a predetermined control strategy, which control strategy is adapted
for characteristics of the work cycle and based on work cycle knowledge achieved from a previously performed lap of the specific
work cycle, wherein the control strategy comprises information with regard to operating the work implement and the method
comprises controlling operation of the work implement.

US Pat. No. 9,071,054

DEVICE AND METHOD FOR CONTROLLING POWER ACCORDING TO A LOAD OF A HYBRID EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A power control apparatus according to a load of a hybrid excavator, comprising:
an ESS (Energy Storage System);
a SW PEC (Swing Motor Power Electric Controller) and an ISAM PEC (Integrated Starter & Alternator Motor Power Electric Controller)
connected to the ESS; and

a H-ECU (H-Electronic Control Unit) comparing an actual power value (P3), which is obtained by adding a power value (P1) calculated
by a voltage or current value input to or output from the SW PEC to a power value (P2) calculated by a voltage or current
value input to or output from the ISAM PEC, with a power value required for a load (P4) that is a function of an operation
amount of a RCV lever and an engine RPM value, determining there is abnormality in the case where a difference between the
two power values exceeds a set error range, and operating to cut off a power supplied from the ESS to the PECs and a power
supplied between the PECs, or comparing a power value (P5) calculated by a voltage or current value input to or output from
the ESS with the power value (P4) required for the load, determining there is abnormality in the case where a difference between
the two power values exceeds the set error range, and operating to cut off the power supplied from the ESS to the PECs and
the power supplied between the PECs.

US Pat. No. 9,482,214

HYDRAULIC CIRCUIT FOR CONTROLLING BOOMS OF CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic circuit for controlling a boom of a construction machine, comprising:
a hydraulic pump connected to an engine;
a boom cylinder connected to the hydraulic pump through a first path and a second path;
a boom control valve shiftably installed in a flow path provided between the hydraulic pump 1 and the boom cylinder and configured to be shifted to control a start, a stop, and a direction change of the boom cylinder;

a holding valve including a holding poppet installed between the boom control valve and the first flow path of the boom cylinder
and a drain valve configured to supply or discharge a hydraulic fluid to or from a back pressure chamber of the holding poppet
so that the natural descending movement of the boom is prevented when the boom control valve is in a neutral state;

a port relief valve installed in the first path at the downstream side of the holding poppet and configured to relieve the
hydraulic fluid when an overload occurs in the first path; and

an orifice valve installed at the downstream side of the port relief valve and configured such that when the boom control
valve is in a neutral state, the hydraulic fluid passing through the port relief valve passes through an orifice to relieve
the hydraulic fluid, and when the boom control valve is shifted by a boom-up pilot signal pressure that is applied thereto
and a part of the boom-up pilot signal pressure is applied to a signal pressure-receiving portion of the orifice valve, the
hydraulic fluid passing through the port relief valve is discharged to a hydraulic tank.

US Pat. No. 9,446,699

FOOTREST FOR CONSTRUCTION MACHINE OPERATING ROOM

VOLVO CONSTRUCTION EQUIPM...

1. A footrest for an operator's cab of a construction machine, on which an operator in the cab can put his or her feet, the
footrest comprising:
a pair of opposed foothold supports, each of which is rotatably fixed at one end thereof to each of a pair of opposed front
pole members of the cab by a hinge pin;

a fixing grip mounted on each of the pole members and under the hinge pin and configured to detachably fix each of the foothold
supports;

a fixing pin coupled to any one of a pair of brackets, which is extendingly mounted on each of the front pole members to allow
the foothold supports to be fixed to the brackets, in a forwardly and rearwardly movable manner and configured to advance
forwardly to press the top surfaces of the foothold supports when each of the foothold supports is pivotally rotated to a
horizontal position; and

a stopper formed protrudingly inwardly from a lower inner surface of any one of the brackets to which the foothold supports
is rotatably fixed, and a locking piece formed to extend from one side surface of each of the foothold supports so as to prevent
an excessive pivotal rotation thereof over a predetermined angle through the stopper when the foothold supports are pivotally
rotated to the horizontal position, as means for preventing the excessive pivotal rotation of the foothold supports over the
predetermined angle when the foothold supports are pivotally rotated to the horizontal position.

US Pat. No. 9,074,347

HYDRAULIC SYSTEM AND A WORKING MACHINE COMPRISING SUCH A HYDRAULIC SYSTEM

Volvo Construction Equipm...

1. A hydraulic system for a working machine, comprising at least one work function and a control valve unit for controlling
hydraulic fluid to and from the work function, and a recovery unit connected to a return port of the control valve unit for
recovering energy from the work function, and a means for limiting the pressure of the hydraulic fluid at the return port,
wherein the pressure limiting means comprises a pilot-operated valve arranged to set a maximum allowable pressure at the return
port of the control valve unit, which pressure is variable by controlling the pilot-operated valve by means of a control unit,
wherein the maximum allowable pressure at the return port of the control valve unit is continuously variable by means of the
pilot-operated valve.

US Pat. No. 9,068,614

ARRANGEMENT FOR SUPPLYING OIL TO A BRAKE

Volvo Construction Equipm...

15. An axle casing for a working machine, the working machine comprising an arrangement for supplying oil to a brake, the
brake comprising one or more brake discs, the brake being arranged for braking an output shaft of a planetary gear where the
planetary gear is a reduction gear, the arrangement comprising a rotatable impeller for supplying oil to the brake, wherein
the impeller is comprised in a centrifugal oil pump and is arranged to be rotated by rotating an input shaft of the planetary
gear, the centrifugal oil pump having a pump housing, the impeller being positioned in the pump housing and the brake discs
being located outside the pump housing, where the input shaft of the planetary gear is arranged to drive a sun gear of the
planetary gear and where the impeller is mounted to the sun gear, wherein the axle casing is provided with at least one channel
in fluid communication with the brake for transportation of oil from the brake to an interior of the axle casing so as to
enable circulation of oil through the brake from the arrangement.

US Pat. No. 9,359,800

HOOD OPENING AND CLOSING DEVICE FOR ZERO TAIL TYPE CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hood opening and closing apparatus for a construction machine of a type having a swing radius at the rear, the apparatus
comprising:
a first seat installed on an outer surface of a fuel tank;
a rotary plate rotatably mounted to a hinge portion installed on the first seat;
a swing hood connected to an upper end of the rotary plate and configured to perform a circular motion around the hinge portion
so as to be opened and closed in left and right directions;

a second seat installed on a top surface of the fuel tank;
a gas spring fixed at a first end thereof to the second seat and fixed at a second end thereof to an underside of the swing
hood, the gas spring being configured to openably and closeably support the swing hood; and

a locking device for opening and closing the swing hood;
wherein the locking device includes:
a latch knob unit installed on one side of the swing hood and having an inner side to which one end of a wire cable is connected;
a latch unit including a latch bracket installed on the fuel tank or a counterweight and a striker installed on the latch
bracket; and

a catch unit including first and second catch brackets installed on an inner side of the swing hood to face each other, a
lock guard rotatably installed between the first and second catch brackets so as to be locked on or unlocked from the striker
depending on the opening and closing of the swing hood, a catch lever rotatably installed on an outer surface of the second
catch bracket and connected to the other end of the wire cable, a locker operated in cooperation with a rotation of the catch
lever to cause the lock guard to be unlocked from the striker when the locked state of the locker is released, and an elastic
member provided on the wire cable and configured to elastically support an initial locking state in which the lock guard is
locked on the striker by pressing the catch lever.

US Pat. No. 9,248,855

STEERING SYSTEM FOR WHEELED CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A steering system for a wheeled construction machine, the steering system comprising:
a hydraulic pump configured to be operably connected to an engine;
a steering motor operably connected to the hydraulic pump;
a steering cylinder configured to operably pivot wheels of the construction machine upon receiving hydraulic fluid;
a steering handle configured to operate the steering motor and a steering valve in response to an operator's steering manipulation
of the steering handle;

wherein the steering valve is disposed in a hydraulic fluid flow path between the hydraulic pump and the steering motor to
control drive of the steering motor, the steering valve is movable between:

a first steering position in which the steering valve directs hydraulic fluid from the hydraulic pump to a first side chamber
of the steering cylinder to pivot the wheels in a first direction;

a second steering position in which the steering valve directs hydraulic fluid from the hydraulic pump to a second side chamber
of the steering cylinder by way of the steering motor to pivot the wheels in a second direction opposite to the first direction;

a first neutral position in which the steering valve blocks hydraulic fluid flow from the hydraulic pump to the steering motor,
and blocks hydraulic fluid flow from the steering motor to the steering cylinder such that force from the wheels is not transmitted
to the steering motor and driving straightness restoring force is not provided to the wheels;

a second neutral position in which the steering valve blocks hydraulic fluid flow from the hydraulic pump to the steering
motor, and permits hydraulic fluid flow between the steering cylinder and the steering motor such that force from the wheels
is transmitted to the steering motor to provide driving straightness restoring force to the wheels;

a link connecting the steering motor and the steering valve to shift the steering valve between the first steering position
and the second steering position; and

a neutral mode controller configured to shift the steering valve between the first neutral position and the second neutral
position;

wherein:
the steering valve is moved to the first neutral position by the neutral mode controller when the steering handle is in a
neutral position and a working mode is selected by an operator of the construction machine in which both a working operation
and a traveling operation can be performed by the construction machine; and

the steering valve is moved to the second neutral position by the neutral mode controller when a travel-dedicated mode is
selected by the operator of the construction machine in which a traveling operation and not a working operation can be performed.

US Pat. No. 9,249,812

HYDRAULIC CIRCUIT FOR PIPE LAYER

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic circuit for a pipe layer, in which a discharge flow rate of a hydraulic pump is controlled by a negative flow
control system, the hydraulic circuit comprising:
first and second hydraulic pumps and a pilot pump, which are configured to be connected to an engine;
one or more first control valves installed in a center bypass path of the first hydraulic pump and configured to be shifted
to control a flow direction and a flow rate of a hydraulic fluid that is supplied to a left traveling motor and a first work
apparatus;

one or more second control valves installed in a center bypass path of the second hydraulic pump and configured to be shifted
to control a flow direction and a flow rate of a hydraulic fluid that is supplied to a right traveling motor and a second
work apparatus;

a straight traveling valve installed at the upstream side of the center bypass path of the second hydraulic pump, and configured
to be shifted by a pilot signal pressure from the pilot pump to cause the hydraulic fluid discharged from the first hydraulic
pump to be distributed and supplied to the control valves for the left and right traveling motors and to cause the hydraulic
fluid discharged from the second hydraulic pump to be distributed and supplied to the control valves for the first and second
work apparatuses when a combined operation mode for simultaneously driving the work apparatus and a traveling apparatus is
selected;

a pair of unloading valves configured to linearly control the closing of a flow path extending from the center bypass paths
of the first and second hydraulic pumps to a hydraulic tank when the work apparatus or the traveling apparatus is finely manipulated
in a pipe-laying operation mode;

a pilot valve configured to be shifted by the pilot signal pressure for shifting the straight traveling valve to cause a signal
pressure that corresponds to a manipulation signal of the traveling apparatus to be supplied to the unloading valve to close
the flow path extending from the center bypass path of the first hydraulic pump to the hydraulic tank and to cause a signal
pressure that corresponds to a manipulation signal of the work apparatus to be supplied to the unloading valve to close the
flow path extending from the center bypass path of the second hydraulic pump to the hydraulic tank; and

an operation mode switching valve configured to be shifted in response to an electrical signal applied thereto from the outside
when a combined operation mode for simultaneously driving the work apparatus and the traveling apparatus is selected to cause
the pilot signal pressure from the pilot pump to be supplied to the straight traveling valve, the pilot valve, and valve spools
installed at a downstream side of the center bypass paths of the first and second hydraulic pumps, respectively.

US Pat. No. 9,157,621

DEVICE FOR FIXING WARNING LAMP OF A CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A flashing lamp fixing device for a construction machine, which is installed at one side of a cab frame, the flashing lamp
fixing device comprising:
an upper sleeve securely fixed at a side of an outer circumferential surface thereof to a flashing lamp mounting plate and
having a first pin-retaining indent formed at a front circumferential edge thereof;

a fixing bracket having a fixed body part and a sleeve mounting part, the fixed body part being mounted to the one side of
the cab frame;

a lower sleeve securely fixed at a side of an outer circumferential surface thereof to the sleeve mounting part of the fixing
bracket and having a second pin-retaining indent formed at a front circumferential edge thereof;

a support lever having an upper adjusting pin and a lower adjusting pin mounted adjacent to opposing ends thereof in such
a manner that the upper adjusting pin is resiliently fit into the first pin-retaining indent of the upper sleeve and the lower
adjusting pin is resiliently fit into the second pin-retaining indent of the lower sleeve, the support lever being configured
to rotatably support the upper sleeve and the lower sleeve in such a manner that the upper sleeve and the lower sleeve are
spaced apart from each other at a predetermined interval; and

upper and lower elastic members adjacent to opposing ends of the support lever and configured to elastically support the upper
sleeve and the lower sleeve.

US Pat. No. 9,598,835

CONTINUOUSLY VARIABLE TRANSMISSION AND A WORKING MACHINE INCLUDING A CONTINUOUSLY VARIABLE TRANSMISSION

Volvo Construction Equipm...

1. A continuously variable transmission, comprising:
a variator unit having a variator input shaft and a variator output shaft;
a first planetary gear set having a first, a second and a third planetary member, the first planetary member being one of
a ring wheel and a planet carrier, the second planetary member being the other one of the ring wheel and the planet carrier,
and the third planetary member being a sun wheel, wherein the first planetary member of the first planetary gear set is operatively
connected to a transmission input shaft; and

a second planetary gear set having a sun wheel, a ring wheel and a planet carrier, the planet carrier being operatively connected
to a transmission output shaft; wherein

the variator input shaft is operatively connected to the second planetary member of the first planetary gear set;
the variator output shaft is operatively connected to the sun wheel of the first planetary gear set, the sun wheel of the
first planetary gear set being further operatively connected to the sun wheel of the second planetary gear set while having
a variable gear ratio between the transmission input shaft and the transmission output shaft; and

the ring wheel of the second planetary gear set being selectively connectable to the second planetary member of the first
planetary gear set and to a gearbox housing of the continuously variable transmission.

US Pat. No. 9,499,084

APPARATUS FOR ADJUSTING HEIGHT AND ANGLE OF FOOTREST SUPPORT FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for adjusting a height and an angle of a footrest support for a construction machine, comprising:
a pair of pedal plates on which an operator's foot is put;
a first bracket formed on the other side of the pedal plate and having a first through-hole formed in the center thereof and
a through-hole for adjustment of an angle of the pedal plate formed on the circumference thereof outside the first through-hole;

a second bracket formed on the other side of the pedal plate to face the first bracket and having a second through-hole formed
in the center thereof;

a pedal arm having one end fixed to the second bracket through the first through-hole and the other end having a through-hole
for adjustment of a height of the pedal plate formed thereon;

a fixing plate installed in a predetermined position of the pedal arm and having a through-hole formed thereon;
a fixing pin coupled to the through-hole of the fixing plate and the through-hole for adjustment of the angle of the pedal
plate, which selectively coincides with the through-hole, to keep the adjusted angle of the pedal plate;

a fastening plate installed in predetermined positions of left and right sides in a cabin and having fastening holes for adjustment
of the height of the pedal plate formed thereon at equal intervals in upward and downward directions; and

a fastening member coupled to the through-hole for adjustment of the height of the pedal plate and the fastening holes for
adjustment of the height of the pedal plate, which selectively coincides with the through-hole, to fix the other end of the
pedal arm to the fastening plate in order to adjust the height of the pedal plate.

US Pat. No. 9,248,764

APPARATUS FOR ADJUSTING HEIGHT OF ARMREST OF CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for adjusting the height of armrests installed on the left and right sides of an operator's seat for a construction
machine, the apparatus comprising:
an inner rail mounted on both sides of the operator's seat and including a guide rail part which has one or more engagement
projections are formed thereon in such a manner as to be spaced apart from each other at equal intervals in a vertical direction;

an outer rail coupled to the inner rail in a vertically slidable manner and mounted on both sides of the armrests;
a locker rotatably mounted on an outer surface of the outer rail and having one or more locking grooves formed on a lower
end thereof so as to allow the engagement projections of the inner rail to be fittingly engaged therein;

an adjustment lever fixed to the locker and having a handle grip formed at one side thereof so that when the handle grip is
pressed to cause the locker to be rotated about a fixing pin, the engagement projections are disengaged from the locking grooves;
and

a connection member configured to connect the lower end portion of the locker to a lower end portion of the outer rail.

US Pat. No. 9,182,312

CONTROL SYSTEM FOR A HYBRID EXCAVATOR

VOLVO CONSTRUCTION EQUIPM...

1. A control system for a hybrid excavator including an engine, a hydraulic pump driven by the engine to drive a hydraulic
actuator by hydraulic fluid discharged therefrom, an electric generator driven by the engine to generate electric energy,
and an electric energy storage device for storing the electric energy generated by the electric generator and supplying the
electric energy to an electric actuator, the control system comprising:
a torque detector configured to detect a torque that is required to drive the hydraulic pump;
a charge detector configured to detect a charge rate (or charge amount) of the electric energy storage device;
a storage device configured to store a degree of electricity generation (or amount of electricity generation) based on the
torque and the charge rate (or charge amount); and

a hybrid controller configured to control the electric generator based on the amount of electricity generation stored in the
storage device, which corresponds to both the torque value detected by the torque detector and the charge rate (or charge
amount) value detected by the charge detector; and

an engine revolution adjuster configured to adjust engine revolution;
wherein:
the electric generator attached to and driven by the engine acts as a motor, to which electric energy is supplied from the
electric energy storage device, and operates the hydraulic pump together with the engine;

if the torque detector detects a torque that is lower than a predetermined level, which is determined to correspond to a standby
state in which no work is being done by the hybrid excavator, the hybrid controller performs a hybrid control including the
following:

when the charge rate or charge amount detected by the charge detector is higher than a predetermined level, the engine revolution
adjuster reduces the engine revolution to a low RPM with low fuel consumption; and

when the charge rate or charge amount detected by the charge detector is lower than the predetermined level, the electric
generator is driven by operating the engine in an appropriate torque region of a different revolution that is suitable for
electricity generation, generates and charges the electric energy storage device, and after the charge rate or charge amount
detected by the charge detector becomes higher than the predetermined level, the engine revolution adjuster reduces the engine
revolution to a low RPM with low fuel consumption.

US Pat. No. 9,518,621

CLUTCH ARRANGEMENT COMPRISING A SHIFT PISTON AND A PISTON HOUSING

Volvo Construction Equipm...

1. A clutch arrangement comprising a shift piston and a piston housing, the shift piston being arranged to be displaced in
an axial direction relative to the piston housing between at least one gear position and a neutral position, the clutch arrangement
further comprising a spring element for forcing the shift piston towards the neutral position, wherein the clutch arrangement
comprises a first return piston and a second return piston arranged on opposite sides of the spring element, and the spring
element is accommodated within a recess of the shift piston, wherein in the neutral position the first return piston is forced
by the spring element against a first stop element of the shift piston, defining an end position for the first return piston
relative to the shift piston, and the second return piston is forced by the spring element against a second stop element of
the shift piston, defining an end position for the second return piston relative to the shift piston, wherein the spring element
is pretensioned between the first return piston and the second return piston such that the shift piston will not be displaced
from the neutral position until a three acting upon the shift piston exceeds a pretensioning force of the spring element.

US Pat. No. 9,504,960

EXHAUST GAS REDUCTION DEVICE FOR HEAVY EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for reducing an exhaust gas that is provided on one end portion of an exhaust pipe of which the other end
portion is connected to an engine mounted on a main frame of heavy equipment, comprising:
a cowl frame mounted on one side of the main frame that is adjacent to the engine to reduce an influence due to vibration
of the engine;

a diesel particulate filter (DPF) having one end portion that communicates with the other end portion of the exhaust pipe
and is mounted on an upper end portion of the cowl frame, having diesel oxidation catalyst (DOC) provided therein, and capturing
particulate matters;

a mixing pipe having one end portion that communicates with the other end portion of the diesel particulate filter, one side
of which communicates with an injection device injecting a reducing agent; and

a selective catalytic reduction (SCR) device mounted on an upper end portion of the cowl frame to communicate with the other
end portion of the mixing pipe to accelerate a reduction reaction between the injected reducing agent and nitrogen oxides
(NOx) in the exhaust gas;

wherein the diesel particulate filter (DPF) and the selective catalytic reduction (SCR) device are cylindrical, have both
end portions which are in hemispheric shapes that are opposed to each other, and are mounted in parallel on the cowl frame.

US Pat. No. 9,540,789

SWING CONTROL SYSTEM FOR CONSTRUCTION MACHINES

VOLVO CONSTRUCTION EQUIPM...

1. A swing control system for construction machines, comprising: a hydraulic pump;
a swing motor driven by a hydraulic fluid supplied from the hydraulic pump and configured to swing an upper swing structure;
a swing control valve installed between the hydraulic pump and the swing motor, and configured to control the flow rate of
the hydraulic fluid supplied and returned to the swing motor via a pair of hydraulic lines;

swing manipulation means configured to apply a spool shift signal corresponding to a manipulated variable of an operator to
the swing control valve;

a shuttle valve installed on a relief line branched off from the hydraulic lines, and configured to select a higher pressure
of the pressures of the hydraulic lines and drain a hydraulic fluid of the selected hydraulic line having the higher pressure
to the relief line;

a relief valve installed on the relief line at the downstream side of the shuttle valve, and configured to control a required
flow rate for a soft swing start to drain the hydraulic fluid through a first cutoff valve to a hydraulic tank, when the first
cutoff valve is opened during swing start acceleration;

a first cutoff valve installed between the shuttle valve and the relief valve, and configured to selectively control the required
flow rate for the soft swing start through the shuttle valve during swing start acceleration;

a second cutoff valve installed on a connection line branched off from the pair of hydraulic lines, and configured to selectively
control a required flow rate for a soft swing stop on the connection line during swing stop deceleration;

a pair of pressure detecting means configured to sense the signal pressure provided to the swing control valve to shift or
switch a spool; and

an electric controller electrically connected to the relief valve, the first cutoff valve, the second cutoff valve, and the
pressure sensors, the electric controller being configured to determine whether the upper swing structure is in the soft swing
start or stop, based on a potential pressure difference between the pressure detecting means, an inertial transform function
and a derivative function operated by a predetermined algorithm, and selectively output valve control signals for controlling
the valves during the swing start acceleration and the swing stop deceleration.

US Pat. No. 9,618,019

HYDRAULIC PRESSURE CONTROL DEVICE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic control apparatus for a construction machine, comprising:
a pilot pump configured to provide a pilot hydraulic pressure;
a swing motor configured to swingably rotate an upper swing structure;
a swing motor brake coupled to the swing motor to brake the swing motor at a normal condition and configured to be released
to rotate the swing motor when the pilot hydraulic pressure is supplied thereto;

a brake control valve installed between the pilot pump and the swing motor brake and configured to control a direction of
the pilot hydraulic pressure to allow for the braking and release of the swing motor brake;

a controller configured to receive a command signal for driving the swing motor and apply the received command signal to the
brake control valve;

a relief valve installed between the brake control valve and the pilot pump and, if a hydraulic pressure that exceeds a predetermined
relief pressure is generated between the brake control valve and the pilot pump, configured to allow the hydraulic pressure
to be returned to a hydraulic tank; and

a drain control valve installed in parallel with the brake control valve and configured to be opened or closed so that the
pilot hydraulic pressure is selectively returned to the hydraulic tank depending on a state of the brake control valve,

wherein if the brake control valve is shifted to rotate the swing motor, the drain control valve is closed, while if the brake
control valve is shifted to brake the swing motor, the drain control valve is opened so that the hydraulic pressure is drained
to the hydraulic tank without passing through the relief valve.

US Pat. No. 9,611,870

CONSTRUCTION EQUIPMENT PRESSURE CONTROL VALVE

VOLVO CONSTRUCTION EQUIPM...

1. A pressure control valve for a construction machine, comprising:
a holding valve block having a pilot signal pressure port and a drain flow path formed thereon and installed between a hydraulic
actuator and a control valve;

a holding poppet having a back pressure chamber formed therein to intercept leakage of hydraulic fluid from the hydraulic
actuator to the control valve in a neutral state;

a first elastic member pressing the holding poppet and elastically biasing an intercepted path between the hydraulic actuator
and the control valve in an initial state;

a piston sliding in the holding valve block when pilot signal pressure is input through the pilot signal pressure port;
a pilot poppet shifted along an inner surface of a sleeve of the holding valve block to drain the hydraulic fluid in the back
pressure chamber toward a first drain flow path of the control valve in response to movement of the piston;

a second elastic member pressing the pilot poppet and elastically biasing an intercepted path between the back pressure chamber
of the holding poppet and the first drain flow path of the control valve in an initial state; and

an auxiliary drain path draining the leaking hydraulic fluid through a second drain path of the holding valve block after
passing through the pilot poppet if the leakage of the hydraulic fluid occurs on a valve seat surface of a check valve that
opens or closes the path between the back pressure chamber of the holding poppet and the first drain flow path of the control
valve.

US Pat. No. 9,328,478

METHOD FOR CONTROLLING A WORKING MACHINE

Volvo Construction Equipm...

1. A method for controlling a working machine provided with a bucket as a work implement by which a lifting force can be exerted
on an object such as a gravel pile, and at least one ground engaging element by which a traction force can be exerted on the
same object, wherein the lifting force is an upward-directed lifting force experienced by the object, comprising:
receiving a state input indicative of a current bucket state, a bucket height being a parameter of the current bucket state,
determining a lifting force eliminating, speed of a power source (LFES) at the current bucket state, the LFES being the speed
at and above which no lifting force could be achieved considering, a reaction force acting on the bucket caused by the traction
force, and

controlling the speed of the power source not to reach the LFES in order that at least some lifting force could be achieved,
wherein a bucket angle is an additional parameter of the current bucket state.

US Pat. No. 9,228,529

ENGINE PROTECTING APPARATUS FOR PREVENTING THE INFLOW OF MOISTURE

VOLVO CONSTRUCTION EQUIPM...

1. An engine protection apparatus for preventing inflow of water, comprising:
a time count unit configured to count time starting from the time point at which a water detection signal is received thereto
from a WIF (Water In Fuel) sensor installed in a water separator;

an RPM (Revolution Per Minute) drop request unit configured to check whether or not water drain occurs at the time point when
the counted accumulated time period exceeds a preset time period, generate an RPM drop request signal if the water drain does
not occur, and cancel the RPM drop request signal if the water drain occurs; and

an engine RPM drop processing unit configured to drop the engine RPM in response to the generated RPM drop request signal;
wherein the engine RPM drop processing unit assigns a predetermined reference drop RPM to a current engine RPM, and the engine
RPM drop processing unit drops the current engine RPM to the reference drop RPM when the RPM drop request signal is received
by the engine RPM drop processing unit.

US Pat. No. 9,649,925

VEHICLE DRIVE TRAIN CONTROL METHOD

Volvo Construction Equipm...

1. A heavy road vehicle comprising a hybrid propulsion system, system comprising
a first traction wheel forming part of a first propulsion system comprising a mechanical drive train including an internal
combustion engine which provides a traction force to the first traction wheel via a gearbox,

a second traction wheel forming part of a second propulsion system comprising a hydraulic pump unit for powering a hydraulic
motor in order to provide a traction force to the second traction wheel,

a control unit for controlling the second propulsion system,
a hydraulic pressure accumulator which is connected to the second propulsion system, the pressure accumulator being connected
to the hydraulic motor in order to maintain a pressure in the hydraulic motor,

wherein the pump unit comprises a main pump, delivering a high pressure flow, and a charge pump, delivering a low pressure
flow.

US Pat. No. 9,371,629

GOOD-EFFICIENCY RPM ZONE DISPLAY DEVICE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for displaying an RPM section having a good efficiency for a construction machine, comprising:
a control unit outputting different control signals depending on whether a current engine RPM belongs to a preset RPM section
having the good efficiency; and

a good-efficiency display unit selectively turning on or off an LED lamp according to the control signal output from the control
unit.

US Pat. No. 9,562,345

DRIVING CONTROL METHOD FOR CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A traveling control method for a construction machine including first and second hydraulic pumps, a left traveling control
valve installed in a discharge flow path of the first hydraulic pump, a right traveling control valve installed in a discharge
flow path of the second hydraulic pump, a first working device control valve installed in a parallel flow path of the first
hydraulic pump, a second working device control valve installed in a parallel flow path of the second hydraulic pump, a traveling
switching valve switched when traveling and working devices are simultaneously operated to distribute and supply hydraulic
fluid from the first hydraulic pump to a left traveling motor and a right traveling motor and to distribute and supply hydraulic
fluid from the second hydraulic pump to the first working device control valve and the second working device control valve
so as to prevent eccentric traveling, an electronic valve switching the traveling switching valve, and a controller controlling
the electronic valve, the traveling control method comprising:
a first step of inputting a set value of a delay time of a traveling switching function of the traveling switching valve;
a second step of inputting in real time an operation signal value according to a user's operation of a joystick and a traveling
pedal;

a third step of determining whether to operate the traveling and working devices according to the operation of the traveling
pedal and the joystick;

a fourth step of switching the traveling switching valve to a traveling switching mode through control of the electronic valve
and returning to the second step repeatedly when the traveling pedal and the joystick are simultaneously operated;

a fifth step of determining whether the traveling pedal is operated and the operation of the joystick is temporarily stopped
for a predetermined time;

a sixth step of determining whether the set value of the delay time of the traveling switching function is larger than an
initially set time required and switching the traveling switching valve to the traveling switching mode if the set value is
relatively larger than the initially set time; and

a seventh step of releasing the traveling switching mode of the traveling switching valve through control of the electronic
valve and repeating returning to the second step in the case where the traveling pedal is not initially operated, in the case
where the traveling pedal is operated and the joystick operation has been stopped over the predetermined time, or in the case
where the initially set time required is larger than the set value of the delay time.

US Pat. No. 9,810,244

FLOW CONTROL VALVE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A flow rate control valve for a construction machine, which is configured to control the supply of a hydraulic fluid to
a hydraulic actuator from first and second hydraulic pumps, the control valve comprising:
a first boom valve block connected to the first hydraulic pump;
a second boom valve block connected to the second hydraulic pump;
a first boom spool slidably coupled to the first boom valve block and configured to be shifted by the supply of a pilot signal
pressure to control the supply of the hydraulic fluid to a boom cylinder from the first hydraulic pump so as to perform a
boom-up or boom-down operation;

a second boom spool slidably coupled to the boom second valve block and configured to be shifted by the supply of the pilot
signal pressure to control the supply of the hydraulic fluid to the boom cylinder from the second hydraulic pump so as to
perform the boom-up or boom-down operation;

a boom-up flow rate adjustment means configured to supply the hydraulic fluid from the first and second hydraulic pumps to
a large chamber of the boom cylinder via the first and second boom spools and allow a part of the hydraulic fluid from the
second hydraulic pump to join the hydraulic fluid being supplied from the first hydraulic pump to the large chamber of the
boom cylinder via the second boom spool through the shift of the first boom spool when the first and second boom spools are
shifted to perform the boom-up operation; and

a boom-down flow rate adjustment means configured to allow a part of the hydraulic fluid being fed back from the large chamber
of the boom cylinder to be returned to the hydraulic tank via the first and second boom spools and allow a part of the hydraulic
fluid being fed back from the large chamber of the boom cylinder to join the hydraulic fluid on a small chamber side of the
boom cylinder as a regenerative hydraulic fluid when the first and second boom spools are shifted to perform the boom-down
operation;

wherein the boom-up flow rate adjustment means allows the part of the hydraulic fluid from the second hydraulic pump to join
the hydraulic fluid at the outside via the shifted second boom spool so as to be supplied to the large chamber of the boom
cylinder, and allows the part of the hydraulic fluid from the second hydraulic pump to be supplied through a confluence line
that fluidically communicates with a cylinder passage in the first boom valve block via a poppet installed in the second boom
valve block to cause the part of the hydraulic fluid to join the hydraulic fluid that is supplied from the first hydraulic
pump to the large chamber of the boom cylinder via the first boom spool; and

wherein the boom-down flow rate adjustment means comprises:
a regenerating poppet mounted on one side of the inside of the first boom spool to allow the part of the hydraulic fluid being
fed back from the large changer of the boom cylinder to join the hydraulic fluid being supplied to the small chamber of the
boom cylinder as the regenerative hydraulic fluid when the first boom spool is shifted;

a boom booster poppet mounted on the first boom valve block in such a manner as to be positioned in a path along which the
hydraulic fluid being fed back from the larger chamber of the boom cylinder returns to the hydraulic tank via the first boom
spool during the boom-down operation, and configured to generate a back pressure to control the boom drop speed to prevent
a boom from dropping down abruptly by its own weight during the boom-down operation; and

a boom booster poppet mounted on the second boom valve block in such a manner as to be positioned in a path along which the
hydraulic fluid being fed back from the larger chamber of the boom cylinder returns to the hydraulic tank via the second boom
spool during the boom-down operation, and configured to generate a back pressure to control the boom drop speed to prevent
a boom from dropping down abruptly by its own weight during the boom-down operation.

US Pat. No. 9,495,615

METHOD FOR AUTOMATICALLY RECOGNIZING AND SETTING ATTACHMENT AND DEVICE THEREFOR

VOLVO CONSTRUCTION EQUIPM...

1. A method for automatically recognizing and setting an attachment for a construction machine including an image capturing
device, the method comprising:
detecting a kind and a type of the attachment using an attachment image captured by the image capturing device;
determining whether the detected attachment is a registered attachment; and
automatically setting inherent functional values that match the attachment if the attachment is a registered attachment as
the result of determination, and automatically setting a user input attachment ID and functional values if the attachment
is not a registered attachment;

wherein the step of automatically setting the user input attachment ID and functional values automatically recognizes and
sets the corresponding attachment ID and inherent functional values, which are recommended by a supplier and match the attachment
in a product specification input table, which is captured by the image capturing device, and automatically setting the user
input attachment ID and the functional values if there is not the product specification input table.

US Pat. No. 10,001,146

FLOW CONTROL DEVICE AND FLOW CONTROL METHOD FOR CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A flow control apparatus for a construction machine comprising:an engine;
a variable displacement hydraulic pump connected to the engine;
a first hydraulic cylinder and a second hydraulic cylinder, which are connected to the hydraulic pump;
a first control valve installed in a center bypass path of the hydraulic pump, the first control valve being configured to allow hydraulic fluid discharged from the hydraulic pump to be returned to a hydraulic tank in its neutral state and configured to control a start, a stop, and a direction change of the first hydraulic cylinder in its shifted state;
a second control valve installed on a downstream side of the center bypass path of the hydraulic pump, the second control valve being configured to allow the hydraulic fluid discharged from the hydraulic pump to be returned to the hydraulic tank in its neutral state and configured to control a start, a stop, and a direction change of the second hydraulic cylinder in its shifted state;
a regeneration flow path configured to supplement and reuse the hydraulic fluid that returns to the hydraulic tank during a retractable drive of the first hydraulic cylinder, and a regeneration valve installed in the regeneration flow path; and
a pressure compensation type flow control valve installed in a meter-in flow path of a spool of the first control valve and configured to limit the flow rate of the hydraulic fluid supplied from the hydraulic pump to the first hydraulic cylinder during a combined operation of the first and second hydraulic cylinders;
wherein the pressure compensation type flow control valve comprises a spool having a first position in which the meter-in flow path is opened by a pressure passing through a meter-in orifice installed in the meter-in flow path and an elastic force of a valve spring, and a second position in which the flow rate of the hydraulic fluid is limited through the shift of the spool in a direction in which an opening portion of the meter-in orifice is reduced if the pressure in the meter-in flow path is higher than the elastic force of the valve spring.

US Pat. No. 9,725,880

APPARATUS FOR CONTROLLING A CASCADED HYBRID CONSTRUCTION MACHINE SYSTEM AND A METHOD THEREFOR

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for controlling a hybrid construction machine in a series type and capable of performing a regenerative operation
during at least one of a boom-down, an arm-in, a bucket-in, and a swing stop operation of the machine controlled by employing
an electric joystick manipulation for an operation of an actuator, the apparatus comprising:
a control unit including a first module, a second module, a first control module, and a second control module, and installed
at the machine and configured to differently control an electric motor electrically connected to the actuator and configured
to drive the actuator based on a result of determining whether the actuator performs the regenerative operation and whether
an energy storage device is in an unchargeable state; and

a motor driver connected to the electric motor and configured to be switched under the control of the control unit to drive
or stop the electric motor;

wherein:
the first module is configured to identify whether the actuator of the construction machine performs the regenerative operation
based on a value obtained by converting the electric joystick manipulation for the operation of the actuator into a digital
value;

the second module is configured to determine whether the energy storage device is in the unchargeable state based on an SOC
(State of Charge) value obtained from the energy storage device;

the first control module is configured to control the motor driver to stop the electric motor that drives the actuator if
it is identified that the actuator of the construction machine performs the regenerative operation and the energy storage
device is in the unchargeable state as a result of determination by the first and second modules; and

the second control module is configured to perform a discharge priority control of the energy storage device according to
a discharge priority mode that is set after the stop of the electric motor.

US Pat. No. 9,522,445

CAULKING METHOD FOR PREVENTING PISTON OF HYDRAULIC/PNEUMATIC CYLINDER FROM BEING LOOSENED

VOLVO CONSTRUCTION EQUIPM...

1. A caulking method for preventing a piston from being loosened in a hydraulic or pneumatic cylinder including a tube, a
cylinder rod that linearly reciprocates in the tube, the piston fastened to a screw portion of the cylinder rod, and a set
screw that prevents the piston from being loosened from the cylinder rod, the method comprising the steps of:
forming a screw hole in a mutual screw engagement portion of the cylinder rod and the piston and fasteningly engaging the
set screw with the screw hole; and

pressing a remaining space portion of the screw hole in an engagement direction of the set screw using a press mechanism after
fasteningly engaging the set screw with the screw hole to change a pitch of a screw thread of an inlet portion of the screw
hole;

wherein the press mechanism includes:
a hammer; and
a press tool detachably mounted on the hammer, the press tool including a caulking guide portion coupled to a wrench hole
of the set screw to secure a center position of caulking around the set screw and the screw hole during the caulking, and
a stopper formed so as to extend from an inner end of the caulking guide portion to adjust a depth of the remaining space
portion during the caulking.

US Pat. No. 9,435,103

APPARATUS FOR SEMI-AUTOMATICALLY OPENING/CLOSING DOOR OF CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A semi-automatic door closing apparatus for a construction machine having a door openably and closably mounted on an operator's
cab, the apparatus comprising:
an upper hinge configured to be mounted on the door, the upper hinge having a first seating hole formed therein and a first
rotation prevention member formed on an underside thereof;

an upper sleeve having a second rotation prevention member formed on a top surface thereof, which is in close contact with
the underside of the upper hinge to prevent idling of the upper sleeve during the opening and closing of the door, a first
plane formed on an underside thereof, a first inclined surface formed on the underside thereof so as to extend directly from
the first plane, and a first vertical surface to which the first inclined surface extends directly to, the first vertical
surface extends from the first inclined surface to the first plane in a direction perpendicular to the first plane, the upper
sleeve being penetratingly formed internally;

a lower hinge configured to be mounted on the cab so as to perform a relative rotation with respect to the upper hinge, the
lower hinge having a second seating hole formed therein and a third rotation prevention member formed on a top surface thereof;

a lower sleeve having a fourth rotation prevention member formed on an underside thereof, which is in close contact with the
top surface of the lower hinge to prevent idling of the lower sleeve during the opening and closing of the door, a second
plane formed on a top surface thereof, a second inclined surface formed on the top surface thereof so as to extend directly
from the second plane, and a second vertical surface to which the second inclined surface extends directly to, the second
vertical surface extends from the second inclined surface to the second plane in a direction perpendicular to the second plane,
the lower sleeve being penetratingly formed internally; and

a guide pin having an upper end coupled to the first seating hole of the upper hinge so as to penetrate through the upper
sleeve and a lower end coupled to the second seating hole of the lower hinge so as to penetrate through the lower sleeve;

wherein when an external force applied to the door is removed after opening the door in a state where the lower hinge is securely
fixed to the cab and the upper hinge is mounted on the door, the first inclined surface of the upper sleeve is rotated to
slide along the second inclined surface of the lower sleeve by the door's own weight, so that the door is semi-automatically
closed in a preset section; and

wherein a width of the first plane of the upper sleeve is formed to be relatively smaller than a width of the second plane
of the lower sleeve, and an inclination angle of a closed section in which the door is semi-automatically closed is variably
adjusted depending on the adjustment of the width of the second plane.

US Pat. No. 9,926,005

PRESSURIZED MEDIUM ASSEMBLY

Volvo Construction Equipm...

12. A method for controlling a pressurized medium assembly comprising a first working chamber and a second working chamber in order to produce a load, the method comprising:controlling a fluid communication between the first working chamber and a pressure line in an on/off manner such that the first working chambers is pressurized to a finite number of pressure levels;
providing a fluid communication between the second working chamber and a pressure line; and
proportionally regulating the pressure in the second working chamber.

US Pat. No. 9,565,739

LAMP CONTROL DEVICE OF CONSTRUCTION MACHINE AND LAMP CONTROL METHOD THEREFOR

VOLVO CONSTRUCTION EQUIPM...

1. A lamp control apparatus for a construction machine, which is connected to respective relays of construction machine lamps,
and configured to control the on/off operation of the relays, the apparatus comprising:
a first key input means configured to bring a screen for setting the on/off state of the respective lamps and drive the relays
to correspond to the on/off state of the lamps which is set to turn on/off the lamps;

a second key input means including keys for instructing the shift between display objects corresponding to the respective
lamps and setting an on/off state of the corresponding object on the set screen; and

a controller configured to alternately control the on state of the corresponding relay and the off state of the whole lamp
relays using a toggle method according to preset lamp on/off combination information of the construction machine if an input
operation of a first key is repeatedly performed in a state where a first key-pressing time of the first key input means is
limited within a first predetermined time range, the controller being configured to bring the set screen, perform the shift
of the object that corresponds to the lamp designated by an operator's input of the second key input means and set the on/off
state of the corresponding lamp, and store the preset lamp on/off combination information if an input operation of the first
key is performed in a state where the first key-pressing time is limited within a second predetermined time range that is
different from the first predetermined time range.

US Pat. No. 9,523,184

HYBRID EXCAVATOR HAVING A SYSTEM FOR REDUCING ACTUATOR SHOCK

VOLVO CONSTRUCTION EQUIPM...

1. A hybrid excavator provided with an actuator impact reduction system, wherein the actuator impact reduction system comprises:
an electric motor;
a hydraulic pump-motor connected to the electric motor and configured to be driven in a forward or reverse direction;
a hydraulic cylinder configured to be expanded and contracted by a hydraulic fluid that is supplied along first and second
flow paths connected to the hydraulic pump-motor;

first and second hydraulic valves installed in the first and second flow paths between the hydraulic pump-motor and the hydraulic
cylinder, respectively, and configured to be shifted to control the first and second flow paths in response to a control signal
applied thereto from outside;

a third hydraulic valve installed in a connection path connected to first and second branch flow paths that are branch-connected
to the first and second flow paths on an upstream side of the first and second hydraulic valves and the first and second flow
paths on a downstream side of the first and second hydraulic valves, respectively, and configured to be shifted to compensate
for or bypass a flow rate of the hydraulic fluid in order to overcome a difference in flow rate of the hydraulic fluid, which
occurs due to a difference in cross section between a large chamber and a small chamber of the hydraulic cylinder; and

first and second pilot chambers configured to supply a pressure of the first and second flow paths to the third hydraulic
valve as a pilot signal pressure so as to shift the third hydraulic valve, the first and second pilot chambers being formed
to have different cross sections,

wherein a ratio of the cross section between the first and second pilot chambers of the third hydraulic valve is made equal
to a ratio of the cross section between the small chamber and the large chamber of the hydraulic cylinder.

US Pat. No. 9,308,936

METHOD FOR CONTROLLING A WORKING MACHINE, AND A WORKING MACHINE

Volvo Construction Equipm...

1. A method for controlling a working machine, the working machine comprising a front section having a frame and a pair of
wheels arranged on a geometrical front wheel axis, and a rear section having a frame and a pair of wheels arranged on a first
geometrical rear wheel axis and a pair of wheels arranged on a second geometrical rear wheel axis arranged behind the first
geometrical rear wheel axis, the front section and the rear section being pivotally connected to each other for pivoting about
a substantially vertical pivot axis, the distance from the geometrical front wheel axis to the vertical pivot axis being shorter
than the distance from the vertical pivot axis to the second geometrical rear wheel axis, comprising:
determining an operation parameter value indicative of the traction between a driven wheel of the rear section and the ground,
and based on the determined parameter value selecting between a first control mode and a second control mode, and

in the first control mode steering the wheels of the second geometrical rear wheel axis to substantially follow the same tracks
as the wheels of the geometrical front wheel axis when driving the working machine during cornering, and

in the second control mode steering the wheels of the second geometrical rear wheel axis to follow tracks which are different
from the tracks of the wheels of the geometrical front wheel axis when driving the working machine during cornering, wherein
the second control mode is selected when the operation parameter value is indicative of the traction for one or more wheels
of the rear section and the ground is not sufficient when the front and rear wheels are following the same tracks.

US Pat. No. 9,663,919

CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A construction machine comprising:
a lower driving structure;
an upper frame mounted on the lower driving structure to horizontally swivel;
a cab mounted on one side of an upper surface of the upper frame;
a mounting portion formed to extend from a rearmost side of a center frame of the upper frame;
a counterweight detachably installed on the mounting portion through a first fastening member, and having a storage space
portion of which a front surface and an upper surface are opened;

a fuel tank coupled to the storage space portion and detachably fixed to the mounting portion through a second fastening member
that fixes the counterweight to the mounting portion in a state where the fuel tank is mounted on the mounting portion and
disposed in the storage space;

an engine room mounted in front of the fuel tank of the upper frame; and
a hydraulic fluid tank installed on one side of a front portion of the engine room.

US Pat. No. 9,534,545

METHOD FOR PROTECTING ENGINE FROM SHORT CIRCUITING AND WIRE FAILURE OF FAN CLUTCH, AND DEVICE THEREOF

VOLVO CONSTRUCTION EQUIPM...

1. A method for protecting an engine from a wiring short-circuit and failure of a fan clutch in a system configured to drive
a cooling fan at a preset minimum RPM when the wiring short-circuit and failure of the fan clutch occurs, the method comprising
the steps of:
detecting a temperature of a cooling water if the cooling fan is rotated at the preset minimum RPM due to the wiring short-circuit
and failure of the fan clutch;

comparing the detected cooling water temperature with a preset dangerous temperature; and
defaulting an engine RPM if the detected cooling water temperature is lower than the preset dangerous temperature as a result
of the comparison and reducing the engine RPM if the detected cooling water temperature is equal to or higher than the preset
dangerous temperature.

US Pat. No. 9,932,721

SYSTEM, WORKING MACHINE COMPRISING THE SYSTEM, AND METHOD OF SPRINGING AN IMPLEMENT OF A WORKING MACHINE DURING TRANSPORT

Volvo Construction Equipm...

1. System for a working machine, wherein the system is configured to spring the movement of a load during transport, wherein the system comprisesat least one hydraulic cylinder for operating the load,
an accumulator,
a pump configured to supply the hydraulic cylinder with pressurized hydraulic fluid via one of a first control valve and a second control valve, which pump is controllable via an electrical signal,
wherein the first control valve is arranged on a conduit connecting to the piston side of the hydraulic cylinder, which first control valve is configured to control a flow communication between the pump and a piston side of the hydraulic cylinder,
the second control valve is arranged on a conduit connecting to a piston rod side of the hydraulic cylinder, the second control valve being configured to control a flow communication between a tank and the piston rod side of the hydraulic cylinder,
a valve configured to control a flow communication between the piston side of the hydraulic cylinder and the accumulator, the valve being connected to a conduit portion fluidly connecting the first control valve to the piston side of the hydraulic cylinder such that, when the valve is open, a fluid communication path is provided between the piston side of the hydraulic cylinder and the accumulator, which fluid communication path does not pass through the first control valve,
a first pressure sensor for detecting a load pressure of the hydraulic cylinder,
a second pressure sensor for detecting a charge pressure of the accumulator, and
a control unit configured to receive signals with information about the pressures detected by the pressure sensors and to generate control signals corresponding to the detected pressures for controlling a springing function by means of the accumulator by allowing fluid communication between the piston side of the hydraulic cylinder and the accumulator via the valve and also allowing fluid communication between the piston rod side of the hydraulic cylinder and the tank via the second control valve, and for controlling the first, control valve in order to achieve a pressure equalization between the accumulator and the piston side of the hydraulic cylinder before the springing function is activated.

US Pat. No. 9,664,208

ENGINE CONTROL METHOD OF CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. An engine control system for a construction machine including a lower driving structure, an upper swing structure mounted
on the lower driving structure, an attachment mounted on the upper swing structure, a main hydraulic pump connected to an
engine, a detection means for detecting pressure on an outlet side of the main hydraulic pump, a detector for detecting whether
the attachment, a traveling device, and a swing, device are intended to operate a main control valve, and a controller, the
engine control system comprising:
determining whether pilot signal pressure, which is detected when at least one of an operation lever and a traveling pedal
for respectively operating the attachment, the swing device, and the traveling device is operated, exceeds a first set pressure;
and

determining whether the pressure on the outlet side of the main hydraulic pump exceeds a second set pressure,
wherein if the pilot signal pressure detected in the first step does not exceed the first pressure and the pressure of the
main hydraulic pump detected in the second step exceeds the second pressure, engine driving is compulsorily stopped by means
of a control signal from the controller.

US Pat. No. 10,018,207

ARRANGEMENT FOR CHARGING AN ACCUMULATOR

Volvo Construction Equipm...

1. An arrangement for charging an accumulator with hydraulic fluid, wherein the accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle, the arrangement comprisinga first hydraulic pump arranged to supply hydraulic fluid to a hydraulic cylinder system of the lift arm,
a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system, wherein the second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator,
a first charging function adapted to charge the accumulator to a first pressure using the second pump by ramping up the pressure in the second pump according to a predefined pressure ramp function to a first pressure when the boom suspension system is inactivated, and
a second charging function adapted to charge the accumulator to a second pressure using the second pump by further ramping up the pressure in the second pump according to a second predefined pressure ramp function to a level which is greater than the first pressure and substantially equal to a current load pressure in the lift arm hydraulic cylinder system when a control signal indicates that the boom suspension system is to be activated.

US Pat. No. 9,334,883

METHOD FOR CONTROLLING A HYDRAULIC SYSTEM OF A WORKING MACHINE

Volvo Construction Equipm...

1. A method for controlling a hydraulic system of a working machine, the hydraulic system comprising a hydraulic machine for
providing hydraulic fluid to one or more actuators of the working machine, the method comprising:
receiving a signal requesting a pump pressure from the hydraulic machine based on the load pressure of a first actuator of
the one or more actuators which first actuator has the highest load pressure of the one or more actuators,

discriminating the pressure request from the first actuator provided that the first actuator is stalled due to overload or
geometrical limitations, and provided that the load pressure of the first actuator is above a maximal pump pressure due to
a propulsion force of the working machine or due to a force from another of the one or more actuators, and

controlling the hydraulic machine to provide a pump pressure based on the load pressure of a second actuator of the one or
more actuators which second actuator is in operation and has the second highest load pressure of the one or more actuators,
or, if no actuator in addition to the first actuator is present and in operation, controlling the hydraulic machine to provide
a predetermined idle pump pressure.

US Pat. No. 9,903,098

PILOT PRESSURE CONTROL SYSTEM

Volvo Construction Equipm...

1. A pilot pressure control system for controlling a pilot signal pressure at a pilot inlet of a control valve, the pilot
pressure control system comprising a pilot outlet adapted to be connected to the pilot inlet, wherein the pilot pressure control
system further comprises a first pilot valve assembly and a second pilot valve assembly, each one of the first and second
pilot valve assemblies being individually controllable so as to selectively provide a first fluid flow direction from a pressure
line to the pilot outlet and a second fluid flow direction from the pilot outlet to a drain line, at least the first pilot
valve assembly being adapted to assume a maximum pressure supply condition so as to supply a first pilot valve assembly maximum
pressure to the pilot outlet, at least the second pilot valve assembly being adapted to provide a pressure drop from the pilot
outlet to the drain line via the second pilot valve assembly, the pilot pressure control system being configured such that,
when the pilot pressure control system is connected to the pressure and drain lines and when the first pilot valve assembly
is controlled so as to assume the maximum pressure supply condition and the second pilot valve assembly provides a fluid flow
in the second fluid direction with a minimum pressure drop, the pressure at the pilot outlet is equal to or above 20% of the
first pilot valve assembly maximum pressure.

US Pat. No. 9,821,698

DUMP BODY FOR A WORKING MACHINE

Volvo Construction Equipm...

1. A dump body for a working machine, the dump body being adapted to assume a loaded condition in which one or more objects
are loaded onto an interior load receiving surface of the dump body, the dump body comprising two main plates that form the
interior load receiving surface of the dump body, the two main plates being joined to each other by a weld joint, wherein
the dump body comprises a backing plate arranged on the two main plates at the inside of the dump body, the backing plate
covering the weld joint and being joined to the two main plates by the weld joint, wherein the backing plate comprises free
longitudinal edges, wherein a width of the backing plate in a direction perpendicular to the longitudinal extension direction
of the weld joint is less than 0.2 times a width of the load receiving surface of the dump body in the direction perpendicular
to the longitudinal extension direction of the weld joint.

US Pat. No. 9,644,650

DRIVER SELF-TUNING METHOD USING ELECTRO-HYDRAULIC ACTUATOR SYSTEM

VOLVO CONSTRUCTION EQUIPM...

1. An operator self-tuning method using an electro-hydraulic actuator system comprising:
a step of receiving, by a human machine interface (HMI), a user's manipulation to select any one of a plurality of electro-hydraulic
actuator (EHA) systems in response to the user's manipulation on a display instrument;

a step of displaying, by the display instrument, a graph in which a mapping relationship of a joystick command vs. an actuator
speed command of the selected EHA system is defined;

a step of, if a predetermined button (or key) is pressed by the user, tuning a maximum speed of a corresponding actuator by
multiplying a pre-stored maximum speed value of an actuator of the selected EHA system by a gain that is increased or decreased
in proportion to the number of pressings of the button (or key), by an upper controller; and

a step of storing, by the HMI, the tuned maximum speed of the corresponding actuator to the upper controller of the corresponding
EHA system,

wherein the corresponding actuator is operated based on the tuned maximum speed.

US Pat. No. 9,618,017

HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic system for a construction machine, comprising:
a variable displacement hydraulic pump connected to an engine;
an attachment operation device and a swing operation device outputting operation signals in proportion to operator's operation
amounts;

at least one attachment actuator connected to a discharge flow path of the hydraulic pump to be driven by the operation of
the attachment operation device;

a first control valve installed in the discharge flow path and shifted to control a start, a stop, and a direction change
of the actuator in response to the operation of the attachment operation device;

a swing motor connected to a flow path branched from the discharge flow path to be driven by the operation of the swing operation
device;

a second control valve installed in the flow path and shifted to control a start, a stop, and a direction change of the swing
motor in response to the operation of the swing operation device;

a first pressure compensation valve installed on a downstream side of the discharge flow path to have an opening amount that
is controlled by a difference between a maximum load sensing pressure and a pressure on the downstream side of the discharge
flow path;

a second pressure compensation valve installed on the downstream side of the flow path to have an opening amount that is controlled
by a difference between the maximum load sensing pressure and a pressure on the downstream side of the flow path;

a pressure sensor detecting a discharge pressure of the hydraulic pump;
a maximum load pressure sensor detecting a pressure of a maximum load sensing pressure line;
an attachment operation amount detection means for detecting the operation amount of the attachment operation device;
a swing operation amount detection means for detecting the operation amount of the swing operation device; and
a control unit receiving an input of detection values of the pressure sensor of the hydraulic pump, the maximum load pressure
sensor, the attachment operation amount detection means, and the swing operation amount detection means, and outputting a
control signal for controlling a discharge flow rate of the hydraulic pump,

wherein one of output ports of the first pressure compensation valve is connected to the attachment actuator through a spool
of the first control valve, and another of the output ports thereof is connected to the maximum load sensing pressure line,
and

wherein one of output ports of the second pressure compensation valve is connected to the swing motor through a spool of the
second control valve, and another of the output ports thereof is not connected to the maximum load sensing pressure line,
but is connected to a swing load pressure sensor for detecting a load pressure of the swing motor.

US Pat. No. 9,416,900

INPUT/OUTPUT PIPE REINFORCING DEVICE FOR VEHICLE COMPRESSOR

VOLVO CONSTRUCTION EQUIPM...

1. A reinforcement device in combination with a compressor and an inlet/outlet pipe, the device comprising:
a body unit including a first body configured surroundingly to support the outer periphery of the inlet/outlet pipe and a
second body having a shape corresponding to that of the first body;

a hinge shaft fixedly mounted at one longitudinal side of the body unit so as to extend in a longitudinal direction of the
body unit to cause the first body and the second body to be pivotally rotated with respect to each other thereabout; and

a flange including a first extension portion formed to extend outwardly radially from one circumferential end of the first
body, a second extension portion formed on the second body to correspond to the first extension portion, and a fixing portion
formed at a joint where the first extension portion and the second extension portion abuts against each other to securely
fix the first body and the second body, so that the flange is coupled to the compressor.

US Pat. No. 10,119,249

CONTROL DEVICE FOR CONFLUENCE FLOW RATE OF WORKING DEVICE FOR CONSTRUCTION MACHINERY AND CONTROL METHOD THEREFOR

VOLVO CONSTRUCTION EQUIPM...

1. A confluent flow control device for a working device of a construction machine, the device comprising:a first variable displacement hydraulic pump, a second variable displacement hydraulic pump, and a pilot pump;
a first hydraulic control lever and a second hydraulic control lever outputting control signals corresponding to degrees of manipulation;
a first working device being actuated by hydraulic fluid supplied by the first hydraulic pump;
a second working device being actuated by hydraulic fluid supplied by the second hydraulic pump;
a first working device control valve disposed on a supply passage between the first hydraulic pump and the first working device to control a direction and flow rate of hydraulic fluid supplied to the first working device when switched by pilot pressure applied thereto in response to the first hydraulic control lever being manipulated;
a second working device control valve disposed on a supply passage between the second hydraulic pump and the second working device to control a direction and flow rate of hydraulic fluid supplied to the second working device when switched by pilot pressure applied thereto in response to the second hydraulic control lever being manipulated;
a confluence valve disposed on the supply passage between the second hydraulic pump and the second working device, upstream of the second working device control valve, wherein the confluence valve, when switched by pilot pressure supplied by the pilot pump, allows a portion of hydraulic fluid discharged from the second hydraulic pump to flow through a confluence passage to join hydraulic fluid discharged from the first hydraulic pump, whereby the first and second working devices perform complex operations;
a first proportional control valve disposed on a pilot line between the pilot pump and the confluence valve to convert pilot pressure supplied to the confluence valve by the pilot pump to a secondary pressure corresponding to an electrical signal applied to first proportional control valve and applying the converted secondary pressure to the confluence valve; and
a controller calculating the electrical signal from pilot pressure applied to the first working device control valve and the second working device control valve to be proportional to degrees of manipulation of the first hydraulic control lever and the second hydraulic control lever and applying the calculated electrical signals to the first proportional control valve.

US Pat. No. 9,863,449

HYDRAULIC SYSTEM AND A METHOD FOR CONTROLLING A HYDRAULIC SYSTEM

Volvo Construction Equipm...

1. A hydraulic system for a working machine, the hydraulic system comprising
a hydraulic actuator and a first hydraulic machine for supplying fluid to the hydraulic actuator,
a hydraulic transformer for supplying fluid to the hydraulic actuator in parallel with the first hydraulic machine, and an
accumulator for fluid, the hydraulic transformer comprising a first port, a second port, and a third port and being adapted
to transform a first pressure and a first flow at the first port to a second pressure and a second flow at the second port,
the third port being in fluid communication with a tank, the second port of the hydraulic transformer being in fluid communication
with the hydraulic actuator and the first port being in communication with the accumulator, and

a hydraulic actuator controller being adapted to determine a required hydraulic power for the hydraulic actuator, wherein
the hydraulic actuator controller further is adapted to request a first power portion of the required hydraulic power from
the hydraulic transformer and a second power portion of the required hydraulic power from the first hydraulic machine,

wherein the hydraulic system comprises a first conduit assembly, the first conduit assembly comprising one or more conduits
and a main control valve connected to the actuator, and the first hydraulic machine is adapted to supply fluid to the hydraulic
actuator via the first conduit assembly, the second port of the hydraulic transformer being in parallel with the first hydraulic
machine in the first conduit assembly on a side of the main control valve opposite the actuator.

US Pat. No. 9,561,826

DEVICE FOR OPENING AND CLOSING THE ENGINE HOOD OF A CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. An apparatus for opening and closing an engine hood for a construction machine, in which an engine room is mounted on an
upper swing structure and the engine hood is mounted on a cowl frame that forms the engine room to be opened and closed through
a gas spring, comprising:
a frame having a first side fixed to the upper swing structure and a second side fixed to the cowl frame;
a stay rod having a free end slidably positioned along a guide rail, and a fixed end rotatably fixed to the engine hood;
the guide rail fixed to one of the first side or the second side, and having a guide groove formed in a length direction and
a plurality of seat portions downwardly formed to be separately situated in the guide groove so as to communicate with the
guide groove, thus maintaining the stay rod in a predetermined opening angle that is to be adjusted with the plurality of
seat portions, separately;

the plurality of seat portions formed on the guide rail include:
a first seat portion on which the free end of the stay rod is seated to maintain the engine hood at a first predetermined
opening angle; and

a second seat portion on which the free end of the stay rod is seated to maintain the engine hood at a second predetermined
opening angle, the second seat portion is formed apart from the first seat portion;

the first seat portion and the second seat portion extend from a first side of the guide groove which is opposite to a second
side of the guide groove, the first side of the guide groove is further from the engine hood than the second side of the guide
groove;

the guide groove formed on the guide rail includes:
a first sliding surface extending in a first plane from an end of the guide groove to the first seat portion, the engine hood
being closed at a location where the stay rod is positioned on the end of the guide groove;

a second sliding surface extending in a second plane between the first seat portion and the second seat portion, the second
plane is closer to the second side of the guide groove than the first plane; and

a third sliding surface extending in a third plane from the second seat groove to a second end of the guide groove, the engine
hood being opened at a location where the stay rod is positioned on the second end of the guide groove at a predetermined
maximum angle, and the third plane is closer to the second side of the guide groove than each of the first plane and the second
plane.

US Pat. No. 9,970,163

INFINITELY VARIABLE ECCENTRIC DEVICE FOR VIBRATORY COMPACTOR

VOLVO CONSTRUCTION EQUIPM...

1. A vibratory compactor that generates vibrations by rotation of eccentric masses, comprising:an inner eccentric rod positioned inside a roller drum of the vibratory compactor and provided with a rack formed on one side of the inner eccentric rod;
a pinion engaged with the rack;
a variable eccentric weight engaged with the pinion so that a distance between the variable eccentric weight and a rotation axis of the inner eccentric rod is changed as the pinion is rotated; and
an outer eccentric tube including a hole for guiding movement of the rack back and forth and a support fixture for fixing a shaft of the pinion so that the pinion is rotated in engagement with the rack,
wherein when the inner eccentric rod moves back and forth, the pinion that is engaged with the rack is rotated as much as the movement of the rack, and as a position of the variable eccentric weight is changed, an amplitude of vibration of the roller drum is changed.

US Pat. No. 9,926,675

SURFACE COMPACTOR AND METHOD OF OPERATION

VOLVO CONSTRUCTION EQUIPM...

1. A surface compactor, comprising:at least one compacting surface for compacting a substrate;
an excitation system that generates a substantially square wave vibrational displacement or force that vibrates the least one compacting surface and includes:
a first exciter that generates a first sine wave vibrational force;
a second exciter that generates a second sine wave vibrational force;
a third exciter that generates a third sine wave vibrational force; and
the first sine wave vibrational force, the second sine wave vibrational force, and the third sine wave vibrational force combine to generate the substantially square wave vibrational displacement or force.

US Pat. No. 9,856,806

INTERNAL COMBUSTION ENGINE AND A METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE

Volvo Construction Equipm...

1. An internal combustion engine having a plurality of cylinders, the internal combustion engine being provided with an arrangement
for exhaust gas recirculation, the plurality of cylinders being divided into a first group and a second group of cylinders,
the internal combustion engine having a control device arranged to provide a heating mode of the internal combustion engine
where the first group cylinders are deactivated and the second group cylinders are activated, wherein, in the heating mode
the control device is arranged to provide more recirculated exhaust gas than inlet air to the first group cylinders, wherein
the control device comprises an EGR valve such that a flow of recirculated exhaust gas can be divided into a first flow of
EGR to the first group of cylinders and a second flow of EGR to the second group of cylinders.

US Pat. No. 9,850,918

HYDRAULIC SYSTEM FOR A WORKING MACHINE AND A METHOD FOR CONTROLLING A HYDRAULIC SYSTEM

Volvo Construction Equipm...

1. A hydraulic system comprising:
a first rotating hydraulic machine and a second rotating hydraulic machine, the first and second hydraulic machine being arranged
to provide a torque via a common output shaft;

first valve means for providing a differential hydraulic pressure level over the first hydraulic machine by using a plurality
of sources of hydraulic fluid having different hydraulic pressure levels;

second valve means for providing a differential hydraulic pressure level over the second hydraulic machine by using the plurality
of sources of hydraulic fluid having different hydraulic pressure levels; and

a control unit configured to control the first valve means and the second valve means such that different discrete levels
of torque are provided via the output shaft of the hydraulic system,

wherein the hydraulic system comprises sources of fluid at at least three different pressure levels.

US Pat. No. 9,784,266

APPARATUS AND METHOD FOR CONTROLLING PREFERENTIAL FUNCTION OF CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A control apparatus for construction machine, comprising:
a variable displacement hydraulic pump and a pilot pump connected to an engine;
an optional device and an attachment connected to the hydraulic pump;
an attachment operation lever outputting an operation signal that corresponds to an operation amount when an operator performs
an operation;

an optional device spool installed in a flow path between the hydraulic pump and the optional device and shifted to control
a flow direction of hydraulic fluid that is supplied to the optional device in response to signal pressure from an outside;

an attachment spool installed in a flow path between the hydraulic pump and the attachment and shifted to control a start,
a stop, and a direction change of the attachment in response to operation of the attachment operation lever;

an electrical operation device for the optional device outputting an operation signal in accordance with an operator's operation;
an electro proportional reducing valve installed in a signal path between the pilot pump and the optional device spool to
output secondary signal pressure that corresponds to an operation signal of the electrical operation device for the optional
device;

a first pressure detection sensor installed in a signal path between the attachment operation lever and the attachment spool
to detect in real time signal pressure depending on the operation amount of the attachment operation lever and to output a
detection signal; and

a controller presetting a priority value or a ratio by the operator in consideration of load pressure of the optional device,
and limiting the signal pressure that is applied from the electro proportional reducing valve to the optional device spool
by operation of the electrical operation device for the optional device to a preset signal pressure depending on the operation
amount of the attachment through detection of the first pressure detection sensor.

US Pat. No. 9,737,910

SIMPLE STRUCTURED ECCENTRIC ASSEMBLY WITH ENHANCED LUBRICATION

VOLVO CONSTRUCTION EQUIPM...

1. An eccentric assembly for vibratory compaction comprising:
an outer eccentric member that is longitudinally elongated cylinder shaped and has a partial longitudinal opening through
the length;

an inner eccentric member that is longitudinally elongated cylinder shaped and has a partial longitudinal opening through
the length and rotatably connected inside of said outer eccentric member so that the inner eccentric member can rotate with
respect to the outer eccentric member around the same axis of rotation;

a pin member that is fitted into the bores of the inner eccentric member and outer eccentric member thus rotatably connects
said inner eccentric member and said outer eccentric member together; and

bushings that are press fitted between the inner eccentric member and said pin member so that the bushings give enough friction
to the inner eccentric member to rotate with respect to the outer eccentric member.

US Pat. No. 9,759,238

HYDRAULIC CONTROL VALVE FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic control valve for a construction machine, comprising:
a valve body including a port Pi for a pilot pump, through which a pilot pressure is introduced, a tank port T through which
the pilot pressure is drained, and a secondary pilot pressure port C configured to selectively fluidically communicate with
the port Pi for the pilot pump or the tank port T;

a shifting device rotatably mounted on the valve body;
a rod configured to be shifted in cooperation with the shifting device when the shifting device is pressedly rotated;
a pilot control valve including a spool that configured to be shifted in response to the shifting of the rod to cause the
port Pi for the pilot pump and the secondary pilot pressure port C to fluidically communicate with each other to set a secondary
pilot pressure in proportion to a shifting amount of the shifting device;

a valve spring configured to elastically support the spool to cause the secondary pilot pressure port C and the tank port
T to fluidically communicate with each other;

a pilot path including an inlet that fluidically communicates with the secondary pilot pressure port C and an outlet that
fluidically communicates with the port Pi for the pilot pump; and

a check poppet openably or closably installed in the pilot path so as to allow for the uni-directional movement of a hydraulic
fluid from the secondary pilot pressure port C to the port Pi for the pilot pump.

US Pat. No. 9,303,636

SYSTEM FOR CONTROLLING HYDRAULIC PUMP IN CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic pump control system for a construction machine, comprising a variable displacement hydraulic pump, at least
one hydraulic actuator connected to the hydraulic pump, a spool configured to control hydraulic fluid supplied to the actuator
when the spool is shifted by a signal pressure that is supplied to the spool in proportion to a manipulation amount of a manipulation
lever, a discharge pressure detection sensor installed in a discharge flow path of the hydraulic pump and configured to detect
a discharge pressure of the hydraulic pump, a signal pressure detection sensor configured to detect the signal pressure based
on the manipulation amount of the manipulation lever, and a control unit configured to control a discharge flow rate of the
hydraulic pump in response to the discharge pressure detection sensor and a signal pressure detection signal from the detection
sensors, the hydraulic pump control system comprising:
a first step of detecting the discharge pressure of the hydraulic pump and the manipulation amount of the operation lever
by the discharge pressure detection sensor and the signal pressure detection sensor;

a second step of calculating a flow rate required by the hydraulic pump based on the manipulation amount of the manipulation
lever;

a third step of comparing the sizes of the detected discharge pressure of the hydraulic pump and a preset pressure value;
a fourth step of proportionally reducing, if the detected discharge pressure of the hydraulic pump is more than the preset
pressure value, a maximum dischargeable flow rate of the hydraulic pump based on a difference between the detected discharge
pressure and the preset pressure value, the maximum dischargeable flow rate of the hydraulic pump is reduced using a proportional
control valve;

a fifth step of comparing a currently required flow rate of the hydraulic pump with the maximum dischargeable flow rate of
the hydraulic pump; and

a sixth step of controlling the discharge flow rate of the hydraulic pump to be the maximum dischargeable flow rate if the
currently required flow rate of the hydraulic pump exceeds the maximum dischargeable flow rate, while controlling the discharge
flow rate of the hydraulic pump to be the flow rate required by the hydraulic pump, which is calculated based on the manipulation
amount, if the currently required flow rate of the hydraulic pump is less than the maximum dischargeable flow rate;

wherein if the detected discharge pressure is more than the preset pressure value even in the case where the discharge flow
rate required by the hydraulic pump does not reach the maximum dischargeable flow rate in the sixth step, the discharge flow
rate required by the hydraulic pump is proportionally reduced based on a difference between the detected discharge pressure
and the preset pressure value in such a manner that the degree of reduction is proportionally controlled based on the size
of the discharge flow rate so that the reduction rate of the discharge flow rate is controlled to be equal to, or to approximate
the size of, the discharge flow rate required by the hydraulic pump.

US Pat. No. 9,725,855

ASSEMBLY FOR VIBRATING A COMPACTING DRUM OF A COMPACTING MACHINE

Volvo Construction Equipm...

1. An assembly for vibrating a compacting drum of a compacting machine, the assembly comprising a shaft rotatably mountable
to a compacting drum of the compacting machine, the centre of mass of the shaft being offset from the geometrical rotation
axis of the shaft, and an outer eccentric member separate from the shaft, the centre of mass of the outer eccentric member
being offset from the geometrical rotation axis of the shaft, and the outer eccentric member being displaceably mounted relative
to the shaft for adjustment of the eccentricity of the assembly, wherein an extension of the outer eccentric member in a direction
parallel with the geometrical rotation axis of the shaft is at least two times an average extension of the outer eccentric
member in a radial direction perpendicular to the geometrical rotation axis of the shaft, such that a mass of the outer eccentric
member forms a distributed load along the geometrical rotation axis of the shaft, wherein the shaft comprises a first stop
arrangement for preventing relative rotation between the shaft and the outer eccentric member in a first angular direction
at a first end position, and a second stop arrangement for preventing relative rotation between the shaft and the outer eccentric
member in a second angular direction, opposite to the first angular direction, at the second end position.

US Pat. No. 9,725,885

HYDRAULIC CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic construction machine comprising:
first and second hydraulic pumps;
a traveling motor and a swing motor, which are operated by hydraulic fluid supplied from the first hydraulic pump;
one or more hydraulic actuators, which are operated by hydraulic fluid supplied from the second hydraulic pump;
a main control valve including first control valves configured to control a flow direction of the hydraulic fluid supplied
from the first hydraulic pump to the traveling motor 3 and the swing motor, and second control valves configured to control a flow direction of the hydraulic fluid supplied from
the second hydraulic pump to the hydraulic actuators;

a first control valve installed on the most upstream side of a supply flow path of the second hydraulic pump and configured
to be shifted to supply the hydraulic fluid from the first hydraulic pump to the traveling motor and to supply the hydraulic
fluid from the second hydraulic pump to the swing motor in response to a control signal that is applied thereto when the traveling
motor and the swing motor are simultaneously operated;

a second control valve installed on the most downstream side of the supply flow path of the second hydraulic pump and configured
to be shifted to close an opening of the most downstream side of the supply flow path of the second hydraulic pump in response
to the control signal that is applied thereto when the traveling motor 3 and the swing motor are simultaneously operated;

a controller configured to receive a detected manipulation signal from a sensing means that senses the traveling and swing
operations; and

an electronic proportional valve configured to output a control signal, which is generated to correspond to an electrical
control signal output from the controller, to the first control valve and the second control valve to shift the first control
valve and the second control valve when it is determined that a combined operation is performed in which the traveling motor
and the swing motor are operated based on the manipulation signal input to the controller from the sensing means.

US Pat. No. 10,019,012

SYSTEM FOR CALCULATING DESIRED ESTIMATED TIME OF ARRIVAL

Volvo Construction Equipm...

1. A system for calculating a desired time of arrival to a target destination of a working site for a working machine, comprising a device mountable to a first vehicle being a working machine, the device comprises:a transmitter;
a receiver; and
a logic unit configured to receive signals for determining a current position and a current vehicle speed of the first vehicle, the logic unit being further configured to determine an estimated time of arrival at a target destination for the first vehicle based on predetermined route information, the current position of the first vehicle and the target destination of the first vehicle;characterized in that the device is configured to:transmit the estimated time of arrival at the target destination for the first vehicle;
receive, from a second vehicle being a working machine, an estimated time of arrival at the target destination for the second vehicle;
calculate a desired estimated time of arrival at the target destination for the first vehicle based on the received estimated time of arrival at the target destination for the second vehicle; and
calculate a desired vehicle speed for the first vehicle for achieving the desired estimated time of arrival at the target destination for the first vehicle,
wherein the device is further configured to:
receive signals indicative of a weight of a load on a platform of the respective first and the second vehicle, and
calculate a desired estimated time of arrival at the target destination for the first vehicle based on the received estimated time of arrival at the target destination for the second vehicle and a weight ratio between the weight of the load on the platform of the first vehicle and the weight of the load on the platform of the second vehicle.

US Pat. No. 9,790,965

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE, PROVIDED WITH PROTECTION DEVICE

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic system for a construction machine having a protection device, comprising:
a variable displacement hydraulic pump operated by an engine;
a hydraulic actuator operated by hydraulic fluid that is supplied from the hydraulic pump;
a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator to control a flow rate of the
hydraulic fluid that is supplied from the hydraulic pump to the hydraulic actuator;

an oil cooler installed in a return flow path from the control valve to a hydraulic fluid tank to cool the hydraulic fluid;
a hydraulic fluid temperature sensor detecting in real time a hydraulic fluid temperature of the hydraulic fluid tank;
a hydraulic pump regulator controlling a discharge flow rate of the hydraulic pump through adjustment of an inclination angle
of a swash plate of the hydraulic pump; and

a controller comparing the hydraulic fluid temperature detected by the hydraulic fluid temperature sensor with a predetermined
hydraulic fluid temperature, and outputting a control signal to an engine revolution control device of the engine so as to
limit the discharge flow rate of the hydraulic pump to or below a predetermined flow rate through adjustment of an engine
revolution of the engine if the detected hydraulic fluid temperature is equal to or lower than a predetermined lower limit
value, or equal to or higher than a predetermined upper limit value.

US Pat. No. 9,765,503

HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A method for controlling a pressure control system for a construction machine, including a variable displacement hydraulic
pump, a hydraulic actuator connected to the hydraulic pump, a plurality of joysticks configured to respectively output control
signals according to a manipulation amount, a flow rate control valve configured to be shifted to control the drive of the
actuator, a relief valve configured to return a hydraulic fluid to a hydraulic tank when pressure of the hydraulic fluid exceeds
a relief pressure of the relief valve during a high load construction work or a low load construction work, a pressure adjustment
means configured to adjust the relief pressure of the relief valve in response to a pressure relief signal applied from a
controller, a pressure detection means configured to detect a system pressure of the hydraulic fluid on a discharge side of
the hydraulic pump, the pressure control method comprising:
the controller determines a normal required relief pressure based on the output control signals generated in response to the
manipulation amount of the plurality of joysticks and the system pressure;

determining whether a function of performing an automatic variable adjustment of the required relief pressure is activated,
based on whether an automatic variable adjustment mode has been selected by a user through a user setting means;

setting the pressure relief signal to the normal relief pressure, when the function of performing an automatic variable adjustment
of the required relief pressure is not activated;

setting the pressure relief signal to a higher relief pressure, higher than the normal relief pressure, during the high load
construction work, when the function of performing an automatic variable adjustment of the required relief pressure is activated;

setting the pressure relief signal to a lower relief pressure, lower than the normal relief pressure, during the low load
construction work, when the function of performing an automatic variable adjustment of the required relief pressure is activated;

outputting the pressure relief signal from the controller to the pressure adjustment means instructing the pressure adjustment
means to adjust the relief pressure of the main relief valve according to the pressure relief signal; and

resetting the pressure adjustment means by outputting the pressure relief signal from the controller after the pressure relief
signal is reset from the higher relief pressure to a decreased relief pressure, lower than the higher relief pressure, when
the relief pressure of the main relief valve has been the higher relief pressure for a predetermined period of time.

US Pat. No. 9,725,882

DEVICE AND METHOD FOR CONTROLLING FLOW RATE IN CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A flow control apparatus for a construction machine comprising:
a hydraulic pump connected to an engine;
a hydraulic actuator connected to the hydraulic pump;
a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator and switched to control a start,
a stop, and a direction change of the hydraulic actuator;

a work mode switching valve installed in a flow path between the control valve and the hydraulic actuator and switched to
a normal work mode or a floating mode;

an electronic valve switching the work mode switching valve to the normal work mode or the floating mode:
an automatic mode setting switch for selecting activation or inactivation of a function of the work mode switching valve;
a detection means for detecting an operation amount of an operation lever operated by an operator;
a pressure detection means for detecting a load pressure of the hydraulic actuator; and
a controller outputting a control signal to the electronic valve so as to automatically switch the work mode switching valve
to the normal work mode or the floating mode in accordance with working conditions that are determined by an operation of
the operation lever input through the detection means and the load pressure of the hydraulic actuator input through the pressure
detection means when the operator sets a function of the work mode switching valve to an automatic mode through an operation
of the automatic mode setting switch;

wherein:
the controller is configured to automatically switch the work mode switching valve to the normal work mode when the automatic
mode is set by the operation of the automatic mode setting switch, a boom-down operation signal is input by the operation
of the operation lever, and pressure in a large chamber of a boom cylinder that is detected by the pressure detection means
is lower than a set pressure; and

the controller is configured to automatically switch the work mode switching valve to the floating mode when the automatic
mode is set by the operation of the automatic mode setting switch, a boom-up operation signal is input once or more by the
operation of the operation lever, the boom-down operation signal is not input by the operation of the operation lever, and
the pressure in the large chamber of the boom cylinder that is detected by the pressure detection means is higher than the
set pressure.

US Pat. No. 9,802,610

METHOD FOR CONTROLLING THE SPEED OF A VEHICLE

Volvo Construction Equipm...

1. A method for controlling the speed of a vehicle, the vehicle comprising a drive train for driving the vehicle, the vehicle
comprising a predetermined preferred speed set, the method comprising:
determining whether or not a substantially constant speed of the vehicle is requested;
if it is determined that a substantially constant speed is requested, determining whether the requested speed lies within
or outside of the predetermined preferred speed set, wherein the predetermined speed set is established based on at least
one vehicle characteristics value indicative of at least one of: wear of one or more components of the vehicle, an amount
of vibrations in one or more components of the vehicle, a noise level within and/or outside of the vehicle and a power loss
of the drive train of the vehicle, and

if it is determined that the requested speed lies outside of the predetermined speed set, automatically adjusting the speed
of the vehicle to a substantially constant vehicle speed that is within the predetermined speed set.

US Pat. No. 9,670,944

METHOD FOR CONTROLLING A HYDRAULIC CYLINDER IN A WORK MACHINE AND CONTROL SYSTEM FOR A WORK MACHINE

Volvo Construction Equipm...

1. A control system for a work machine comprising
a hydraulic machine and at least one hydraulic cylinder, wherein a first port of the hydraulic machine is connected to the
hydraulic cylinder via a first line,

a line that connects the first port of the hydraulic machine and a tank,
an electric machine arranged to drive the hydraulic machine,
control means arranged in the line to drain the first port of the hydraulic machine, and
a control unit programmed to detect that a lifting movement of the implement is to be initiated and, after detecting that
a lifting movement of the implement is to be initiated, before the lifting movement takes place by supplying fluid to the
hydraulic cylinder, control the control means to provide a leakage flow from the hydraulic machine so that a basic speed of
the hydraulic machine is attained,

wherein the hydraulic machine is connected to a piston side of the hydraulic cylinder via the first line and a piston-rod
side of the hydraulic cylinder via a second line, the hydraulic machine has a second port which is connected to the piston-rod
side of the hydraulic cylinder via the second line, and the hydraulic machine is arranged to be driven in two different directions,
with one direction being associated with a flow out from the first port and the second direction being associated with a flow
out from the second port.

US Pat. No. 10,125,798

METHOD FOR CONTROLLING LOWERING OF AN IMPLEMENT OF A WORKING MACHINE

Volvo Construction Equipm...

1. A method for controlling lowering of an implement of a working machine, the working machine having a hydraulic system comprising a hydraulic cylinder for moving the implement and a first control valve for controlling the flow of hydraulic fluid from a piston side of the hydraulic cylinder, and a recovery unit connected to the control valve for recovering energy by receiving a return flow from the piston side of the hydraulic cylinder, the piston side of the hydraulic cylinder and the control valve being connected to each other, and a piston rod side of the hydraulic cylinder being connected to the control valve and to the recovery unit at a point between the control valve and the recovery unit, the method comprising:identifying a requested lowering speed of the implement,
identifying a desired pressure at the piston side of the hydraulic cylinder based on the requested lowering speed and controlling a counter pressure provided by the recovery unit to provide a counter pressure at the piston rod side resulting in the desired pressure at the piston side of the hydraulic cylinder,
enabling fluid communication between the piston side of the hydraulic cylinder and the recovery unit, and between the piston side of the hydraulic cylinder and the piston rod side of the hydraulic cylinder, via the control valve, and
controlling the control valve in such a way that the flow through the control valve corresponds to the requested lowering speed of the implement.

US Pat. No. 10,047,769

FLOW CONTROL VALVE FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A flow control valve for a construction equipment comprising; a valve body installed on the path between a hydraulic pump and a hydraulic actuator and configured with a supply path communicating with a pump path supplying the hydraulic oil from the hydraulic pump and actuator ports connected to the hydraulic actuator;a spool provided within the valve body so that by switching, the hydraulic oil of the hydraulic pump is supplied to the hydraulic actuator, and a hydraulic oil discharged from the hydraulic actuator is returned to a hydraulic oil tank;
a pressure chamber provided within the spool, which communicates with the supply path and an actuator port on one side;
a signal pressure path provided within the spool, which communicates with the actuator port on the other side and the pressure chamber; and
a flow control valve provided within the pressure chamber, wherein when the pressure of the hydraulic oil returning to the hydraulic oil tank from the hydraulic actuator exceeds a predetermined pressure, the flow control valve is switched by the hydraulic oil discharged from the hydraulic actuator supplied through the signal pressure path and blocks an opening area of the flow control valve.

US Pat. No. 9,970,541

GEAR BOX FOR A WORKING MACHINE AND A METHOD FOR CONTROLLING A GEAR BOX

Volvo Construction Equipm...

1. A gear box for a working machine, the gear box being configurable to provide a first set of speed-changing gears having a first set of gear ratios and a second set of speed-changing gears having a second set of gear ratios, wherein the first set of gear ratios comprises a plurality of lower gear ratios and the second set of gear ratios comprises a plurality of higher gear ratios higher than the first set of gear ratios, comprising:a gear box housing,
an output shaft for supplying torque out from the gear box, wherein the output shaft is connected to a planetary gear set of the gear box, the lower gear ratios providing a higher rotational speed ratio between an input shaft and the output shaft in comparison to the higher gear ratios,
a friction disc clutch arrangement which is arranged between a ring gear of the planetary gear set and the gear box housing for enabling connection of the ring gear to the gear box housing, the friction disc clutch arrangement being positioned in an engaged state for the first set of speed-changing gears and positioned in a disengaged state for the second set of speed-changing gears, and
a control unit configured to controllably alternate the friction disc clutch arrangement between:
the engaged state and an at least partially engaged state when the gear box is configured to provide the first set of gear ratios, and between
the disengaged state and the at least partially engaged state when the gear box is configured to provide the second set of gear ratios,wherein the control unit is further configured to position the friction disc clutch arrangement in the at least partially engaged state when changing gear within at least one of the first set of speed-changing gears and the second set of speed-changing gears.

US Pat. No. 9,765,502

POWER SYSTEM FOR A WORKING MACHINE

Volvo Construction Equipm...

1. A power system for a working machine, the power system comprising:
a transmission for driving the working machine, the transmission comprising a continuously variable gear box having a gear
unit and a hydraulic variator unit;

a work hydraulic circuit for controlling at least one hydraulic actuator of the working machine;
wherein the hydraulic variator unit is hydraulically connected to the work hydraulic circuit to hydraulically transfer energy
from the hydraulic variator unit to the work hydraulic circuit, wherein the hydraulic variator unit comprises a primary hydraulic
machine and a secondary hydraulic machine, wherein at least one of the primary hydraulic machine and the secondary hydraulic
machine is hydraulically connected to the work hydraulic circuit; and

wherein the primary and secondary hydraulic machine comprises:
a first rotating hydraulic machine and a second rotating hydraulic machine, the first rotating hydraulic machine and second
rotating hydraulic machine being arranged to provide a torque via a common output shaft;

a first valve means for providing a differential hydraulic pressure level over the first rotating hydraulic machine by using
two sources of hydraulic fluid having different hydraulic pressure levels;

a second valve means for providing a differential hydraulic pressure level over the second rotating hydraulic machine by using
two sources of hydraulic fluid having different hydraulic pressure levels; and

a control unit configured to control the first valve means and the second valve means such that different discrete levels
of torque are provided via the output shaft,

wherein the first rotating hydraulic machine and the second rotating hydraulic machine are separate machines.

US Pat. No. 9,651,063

PRIORITY CONTROL SYSTEM FOR CONSTRUCTION MACHINE

VOLVO CONSTRUCTION EQUIPM...

1. A priority control system for a construction machine, comprising:
an engine;
first and second variable displacement hydraulic pumps connected to the engine and a pilot pump;
a boom control valve configured to control the drive of a boom cylinder, a bucket control valve configured to control the
drive of a bucket cylinder, and a first traveling control valve configured to control the drive of a left traveling motor,
wherein the boom control valve, the bucket control valve, and the first traveling control valve are installed in a first center
bypass path of the first hydraulic pump so as to be connected to each other through a first parallel flow path;

a swing control valve configured to control the drive of a swing motor, an arm control valve configured to control the drive
of an arm cylinder, and a second traveling control valve configured to control the drive of a right traveling motor, wherein
the swing control valve, the arm control value, and the second traveling control valve are installed in a second center bypass
path of the second hydraulic pump so as to be connected to each other through a second parallel flow path;

first and second pressure generation devices configured to output a control signal corresponding to a manipulation amount,
respectively;

a shuttle valve configured to output a selected first pilot signal pressure applied to the swing control valve so that the
swing motor can be swung in a left or right direction in response to the manipulation of the first pressure generation device;
and

a priority control valve installed in a flow path between the second parallel flow path on the second hydraulic pump side
and an inlet port of the arm control valve, and configured to be switched between a throttle state and a throttle release
state,

wherein
the priority control valve is shifted to the throttle state by the first pilot signal pressure output from the shuttle valve
when a swing operation of a first actuator and an arm-in driving operation of a second actuator are simultaneously performed,
and

the priority control valve is shifted to the throttle release state by the elastic force of a valve spring of the priority
control valve and a second pilot signal pressure applied to the priority control valve opposing the first pilot signal pressure,
the second pilot signal pressure being applied to the arm control valve to perform an arm-out driving operation of the second
actuator when the swing operation and the arm-out driving operation are simultaneously performed.

US Pat. No. 10,508,415

SWING CONTROL APPARATUS OF CONSTRUCTION EQUIPMENT AND CONTROL METHOD THEREOF

VOLVO CONSTRUCTION EQUIPM...

1. A swing control apparatus for construction equipment comprising;first and second hydraulic pumps and a pilot pump;
a work device including a boom, an arm and a bucket, which are operated by a boom cylinder, an arm cylinder and a bucket cylinder, respectively, driven by hydraulic fluid of the first and second hydraulic pumps;
a work device control valve which is configured to control hydraulic fluid supplied from the first and second hydraulic pumps to the boom cylinder, arm cylinder and bucket cylinder, respectively;
a swing motor for swinging an upper swing body which is driven by hydraulic fluid supplied from one of the first and second hydraulic pumps;
a swing control valve for controlling the hydraulic fluid supplied to the swing motor from the first or second hydraulic pump;
a swing operation lever;
a direction control valve for applying to the swing control valve a pilot pressure supplied by operating the swing operation lever, or a pilot pressure supplied by selecting a semiautomatic swing mode;
at least one electronic proportional variable relief valve installed in the swing motor, which variably controls a preset relief pressure so as to vary a braking torque of the swing motor; and
a controller for applying an electric control signal to the electronic proportional variable relief valve to be relieved so that the relief pressure of the electronic proportional variable relief valve is preset to increase or decrease in order to make a target swing angle become the sum of a swing braking angle predicted from the inertia moment of the upper swing body plus a swing angle detected of the upper swing body, when the semiautomatic mode is selected and the work device is operated during a return swing of the upper swing body;
wherein the controller includes a PD controller for applying a calculated electrical current value to the electronic proportional variable relief valve to be relieved, in which the PD controller is performed with the target swing angle of PD control inputted by the sum of the swing braking angle predicted from the inertia moment of the upper swing body plus the swing angle detected of the upper swing body so that the target swing angle can be reached by compensating the inertia moment of the upper swing body, which varies when the work device is operated during the return swing of the upper swing body.

US Pat. No. 9,937,844

METHOD FOR TIPPING A LOAD AND A TIPPING DEVICE

Volvo Construction Equipm...

1. A method for tipping a load by a working machine, where the working machine comprises a load carrier and at least one lift cylinder adapted to raise the load carrier for tipping the load, comprising:obtaining a measure for the inclination angle of the working machine, where the inclination of the working machine is such that the rear end of the working machine is higher than the front end thereof,
allowing a first maximal tipping pressure to the lift cylinder for raising the load carrier when the inclination angle is smaller than a predefined inclination angle, and
allowing a second maximal tipping pressure to the lift cylinder for raising the load carrier when the inclination angle is greater than the predefined inclination angle, the second maximal tipping pressure exceeding the maximal tipping pressure.

US Pat. No. 9,915,039

DEVICE FOR CLEANING THE DRUM SURFACE OF ASPHALT COMPACTORS

Volvo Construction Equipm...

1. A device for cleaning a drum surface of an asphalt compactor, comprising:
a first and a second brackets fixed to a body of said compactor, said brackets being spaced from each other and extending
downward;

a first supporting arm pivotably connected to said first bracket, said first supporting arm extending downward toward said
drum;

a second supporting arm pivotably connected to said second bracket, said second supporting arm extending downward toward said
drum;

a roller shaft supported by said supporting arms, said roller shaft being parallel to the rotation axis of said drum and extending
along the width of said drum;

a roller wiper mounted to said roller shaft, said roller wiper extending along the width of said drum and contacting the surface
of said drum;

a first elastic member engaged between said first bracket and said first supporting arm and elastically pressing said roller
wiper against the surface of said drum; and

a second elastic member engaged between said second bracket and said second supporting arm and elastically pressing said roller
wiper against the surface of said drum;

wherein said first elastic member is a first compression spring with a first end fixed to said first bracket and a second
end engaged with one of a plurality of apertures formed on said first supporting arm along the width thereof; and

said second elastic member is a second compression spring with a first end fixed to said second bracket and a second end engaged
with one of a plurality of apertures formed on said second supporting arm along the width thereof.

US Pat. No. 10,280,948

HYDRAULIC SYSTEM AND METHOD FOR CONTROLLING AN IMPLEMENT OF A WORKING MACHINE

Volvo Construction Equipm...

16. A method for controlling an implement of a working machine comprising a hydraulic cylinder for raising and lowering the implement, the method comprising:comparing a pressure value in the hydraulic cylinder with a preset target pressure level range; and
controlling the pressure in the hydraulic cylinder to be within the preset target pressure level range by adding or draining hydraulic fluid to/from a pressure side of the hydraulic cylinder solely by receiving hydraulic fluid from a hydraulic accumulator unit or by providing hydraulic fluid to the hydraulic accumulator unit for maintaining a substantially constant ground contact force between the implement and the ground.

US Pat. No. 10,208,456

FLOW CONTROL VALVE FOR CONSTRUCTION EQUIPMENT, HAVING FLOATING FUNCTION

VOLVO CONSTRUCTION EQUIPM...

1. A flow control valve for construction equipment having a floating function, comprising:a valve body defining
a supply passage communicating with a pump passage through which working fluid is supplied from a hydraulic pump and
first and second actuator passages connected to a hydraulic cylinder actuated by working fluid supplied from the hydraulic pump;
a spool switchably disposed within the valve body, wherein the spool is switched to allow the supply passage to communicate with the first or second actuator passage, such that working fluid from the hydraulic pump is supplied to the hydraulic cylinder through the supply passage and the first actuator passage, and working fluid discharged from the hydraulic cylinder returns to a tank passage through the second actuator passage;
a regeneration passage through which a portion of working fluid returning to the tank passage from a large chamber of the hydraulic cylinder is supplied to a small chamber of the hydraulic cylinder such that the portion of working fluid is regenerated; and
a floating switching valve disposed in the regeneration passage, wherein the floating switching valve is switched to a floating position in response to a pilot pressure applied thereto,
thereby causing the large chamber and the small chamber of the hydraulic cylinder to communicate with each other, and
causing the second actuator passage, through which working fluid is supplied to the small chamber of the hydraulic cylinder, and the regeneration passage to communicate with each other, such that an amount of working fluid is allowed to flow in both directions;
wherein the floating switching valve comprises:
a logic valve opening and closing the regeneration passage; and
a control valve disposed in a passage between a back pressure chamber of the logic valve and a working fluid tank,
wherein, when the control valve is switched in response to the pilot pressure applied thereto to switch the floating switching valve to the floating position, working fluid drains from the back pressure chamber of the logic valve, thereby allowing an amount of working fluid to flow to the regeneration passage from the second actuator passage through which working fluid is supplied to the small chamber of the hydraulic cylinder; and
wherein a drain line, through which the working fluid drains from the back pressure chamber of the logic valve, is connected to the tank passage within the valve body.

US Pat. No. 10,184,499

HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE

Volvo Construction Equipm...

1. A hydraulic circuit for a construction machine comprising:a variable displacement hydraulic pump;
at least two hydraulic actuators driven by hydraulic fluid that is supplied from the hydraulic pump;
control valves installed in a center bypass path of the hydraulic pump and shifted to control a start, stop, and direction change of the hydraulic actuators;
a parallel flow path having inlets branched and connected to predetermined positions on an uppermost stream side of the center bypass path and outlets connected to inlet ports of the control valves;
bleed-off paths formed on the control valves excluding the lowermost downstream side control valve among the control valves to selectively communicate with the center bypass path, the bleed-off paths communicating with the center bypass path when the control valves are shifted for a combined work;
a switching valve installed on a lowermost downstream side of the center bypass path to intercept the center bypass path when a pilot signal pressure is applied; and
for applying the pilot signal pressure to shift the switching valve, a shuttle valve selecting the relatively higher pilot signal pressure of the pilot signal pressures applied to the upstream and downstream side control valves on which the bleed-off paths are formed and applying the selected pilot signal pressure to the switching valve.

US Pat. No. 10,100,977

LIQUID DISTRIBUTION SYSTEM

Volvo Construction Equipm...

1. A liquid distribution system for a hub, the liquid distribution system comprising a liquid supply portion arranged to supply liquid to at least one component located within the hub, the liquid distribution system further comprising a liquid evacuator portion arranged to act on liquid being inside the hub for evacuating liquid from the hub, wherein the liquid evacuator portion is arranged to be driven by liquid that flows via the liquid supply portion for evacuating liquid from the hub, wherein the liquid evacuator portion comprises a liquid pump, and wherein the liquid evacuator portion, including the liquid pump, is adapted to be accommodated within the hub.

US Pat. No. 9,951,482

VIBRATION ISOLATION FOR COMPACTOR

Volvo Construction Equipm...

1. A vibratory compactor, comprising:a drum;
a propulsion motor configured to rotate the drum;
a drive plate disposed between the propulsion motor and the drum in such a way as to be connected to the propulsion motor to transmit a rotating force to the drum;
a drum support configured to rotatably support the drum;
a first active isolation mass disposed between the drum support and the drum;
a second active isolation mass disposed between the drive plate and the drum;
a plurality of connectors disposed between the drum support and the first active isolation mass, between the first active isolation mass and the drum, between the drum and the second active isolation mass, and between the second active isolation mass and the drive plate;
an eccentric shaft configured to be rotated while penetrating through the first active isolation mass, the drum, and the second active isolation mass;
a primary eccentric weight attached to the eccentric shaft inside the drum;
an active isolation eccentric weight attached to the each of the eccentric shaft inside the first active isolation mass and the second active isolation mass; and
a vibration motor configured to rotate the eccentric shaft,
wherein when the eccentric shaft is rotated, a phase of a vibration generated by the active isolation eccentric weights is opposite to that of a vibration generated by the primary eccentric weight, and the vibration generated by the active isolation eccentric weights cancels the vibration generated by the primary eccentric weight.

US Pat. No. 9,765,504

HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic system for a construction machine comprising:
first and second hydraulic pumps P1 and P2 and a pilot pump, which are connected to an engine;

an arm cylinder connected to a discharge flow path of the first hydraulic pump P1;

a boom cylinder connected to a discharge flow path of the second hydraulic pump P2;

a first boom control valve installed on an upstream side of the discharge flow path of the second hydraulic pump P2 and configured to be shifted to control a start, a stop, and a direction change of the boom cylinder;

a second boom control valve installed on an upstream side of the discharge flow path of the first hydraulic pump P1 and configured to be shifted to allow a hydraulic fluid discharged from the first hydraulic pump P1 to join a hydraulic fluid supplied to the boom cylinder from the second hydraulic pump P2 through a boom-up confluence flow path;

a first arm control valve installed on a downstream side of the discharge flow path of the first hydraulic pump P1 and configured to be shifted to control a start, a stop, and a direction change of the arm cylinder;

a second arm control valve installed on a downstream side of the discharge flow path of the second hydraulic pump P2 and configured to be shifted to allow a hydraulic fluid discharged from the second hydraulic pump P2 to join a hydraulic fluid supplied to the arm cylinder from the first hydraulic pump P1 through an arm-in confluence flow path;

a valve installed in a flow path between a hydraulic fluid inlet port of the first arm control valve and a hydraulic tank;
and

a spool for the second boom control valve composed of a first port configured to be shifted depending on whether an arm-in
pilot pressure is higher or lower than a set pressure to allow the second boom control valve to be shifted to a neutral position
if the arm-in pilot pressure is equal to or higher than the set pressure, a second port configured to form a parallel pressure
section in which the pilot pressure is not increased relative to a boom-up stroke, and a third port configured to shift the
second boom control valve to allow the hydraulic fluid from the first hydraulic pump P1 to join the hydraulic fluid from the second hydraulic pump P2 if the arm-in pilot pressure is lower than the set pressure.

US Pat. No. 10,106,936

VIBRATION ISOLATION FOR COMPACTOR

Volvo Construction Equipm...

1. A vibratory compactor, comprising:a drum;
a frame supporting the drum;
an eccentric shaft configured to be rotated;
a primary eccentric weight attached to the eccentric shaft inside the drum;
a vibration motor configured to rotate the eccentric shaft,
at least one active isolation eccentric weight located outside the drum that generates a phase of a vibration that is substantially opposite to that of a vibration generated by the primary eccentric weight as the primary eccentric weight is rotated inside the drum.

US Pat. No. 10,094,092

HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY HAVING FLOATING FUNCTION AND METHOD FOR CONTROLLING FLOATING FUNCTION

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic circuit for a construction machine having a floating function, comprising:at least two hydraulic pumps;
a hydraulic cylinder driven by hydraulic fluids supplied from the hydraulic pumps;
a boom driving control valve installed in a flow path between any one of the hydraulic pumps and the hydraulic cylinder and configured to be shifted to control a start, a stop, and a direction change of the hydraulic cylinder;
a boom confluence control valve installed in a flow path between another of the hydraulic pumps and the hydraulic cylinder and configured to be shifted to allow the hydraulic fluids discharged from the hydraulic pumps to join together so as to be supplied to a large chamber of the hydraulic cylinder or to allow hydraulic fluids of the large chamber and a small chamber of the hydraulic cylinder to join together so as to be supplied to a hydraulic tank;
a manipulation lever (RCV) configured to output a manipulation signal corresponding to a manipulation amount;
a first pressure sensor configured to measure a pressure of the hydraulic fluid on the large chamber of the hydraulic cylinder;
a second pressure sensor configured to measure a boom-down pilot pressure that is applied to an end of the boom driving control valve; and
a control valve installed in a flow path between the manipulation lever and the boom driving control valve, and installed in another flow path between the manipulation lever and the boom confluence control valve, and configured to be shifted in response to the application of electrical signals that correspond to the pressure and the boom-down pilot pressure detected by the first and second pressure sensors to shift the boom confluence control valve to a floating state through application of the boom-down pilot pressure to the boom confluence control valve, or to supply the hydraulic fluid of the one of the hydraulic pumps to the small chamber of the hydraulic cylinder by the shift of the boom driving control valve through application of the boom-down pilot pressure to the boom driving control valve.

US Pat. No. 10,082,159

TWIN PRIORITY VALVE

Volvo Construction Equipm...

1. A hydraulic system for a work machine, comprising a first hydraulic actuator for controlling a first function and a second hydraulic actuator for controlling a second function, the first hydraulic actuator being provided with an inlet valve, the hydraulic system further comprising:a first hydraulic machine for providing hydraulic fluid to at least one of the first actuator and the second actuator via a first priority valve;
a second hydraulic machine for providing hydraulic fluid to at least one of the first actuator and the second actuator of the working machine via a second priority valve;
wherein each of the first priority valve and the second priority valve is configured to be controlled by a pressure drop over the inlet valve of the first actuator; wherein the pressure drop is measured as a difference between a pressure within the first actuator and a pressure upstream of the inlet valve such that when the pressure drop is lower than a first threshold value, a flow of hydraulic fluid is allowed only to the first actuator;
the second priority valve is further configured to allow a flow of hydraulic fluid to both of the first actuator and the second actuator for a pressure drop higher than the first threshold value;
the first priority valve is further configured to allow a flow of hydraulic fluid to both of the first actuator and the second actuator for a pressure drop higher than a second threshold value; and
wherein the second threshold value is higher than the first threshold value.

US Pat. No. 10,343,481

HYDRAULIC SUSPENSION SYSTEM FOR A VEHICLE, A VEHICLE BEING PROVIDED WITH SUCH A SYSTEM AND A METHOD FOR DAMPING AN ANTI-ROLL FUNCTION OF A VEHICLE

Volvo Construction Equipm...

1. An articulated hauler comprising a hydraulic suspension system, the articulated hauler comprising a front section with a cab for an operator, and a rear section with a receiver for a load and two pairs of wheels, the front section is connected to the rear section by a pivot joint such that the front section and the rear section may pivot relative each other about a horizontal pivot axis extending in the longitudinal direction of the articulated hauler, the system being arranged between a pair of wheels of the front section, the system comprises a first hydraulic cylinder and a second hydraulic cylinder, each of the hydraulic cylinders comprising a first chamber and a second chamber (2b, 3b),at least four hydraulic accumulators, and
at least a first and a second fluid communication path,
wherein the first chamber of the first hydraulic cylinder and the second chamber of the second hydraulic cylinder are in fluid communication with each other by means of the first fluid communication path, and the first chamber of the second hydraulic cylinder and the second chamber the first hydraulic cylinder are in fluid communication with each other by means of the second fluid communication path, wherein a first hydraulic accumulator of the at least four hydraulic accumulators is in fluid communication with the first fluid communication path by means of a first accumulator fluid communication path and a second hydraulic accumulator of the at least four hydraulic accumulators is in fluid communication with the first fluid communication path by means of a second accumulator fluid communication path, wherein a connection point between the first accumulator fluid communication path and the first fluid communication path is distanced from a connection point between the second accumulator fluid communication path and the first fluid communication path, and wherein a third hydraulic accumulator of the at least four hydraulic accumulators is in fluid communication with the second fluid communication path by means of a third accumulator fluid communication path and a fourth hydraulic accumulator of the at least four hydraulic accumulators is in fluid communication with the second fluid communication path by means of a fourth accumulator fluid communication path, wherein a connection point between the third accumulator fluid communication path and the second fluid communication path is distanced from a connection point between the fourth accumulator fluid communication path and the second fluid communication path wherein the first fluid communication path has at a portion of the extension between the connection point to the first accumulator fluid communication path and the connection point to the second accumulator fluid communication path a cross-sectional area that is smaller than the smallest cross-sectional area of each one of:
the extension between the connection point to the first accumulator fluid communication path and the first chamber of the first hydraulic cylinder,
the extension between the connection point to the second accumulator fluid communication path and the second chamber of the second hydraulic cylinder, and
the first and second accumulator fluid communication paths (6a, 7a),andthe second fluid communication path has at a portion of the extension between the connection pointer to the third accumulator fluid communication path and the connection point to the fourth accumulator fluid communication path a cross-sectional area that is smaller than the smallest cross-sectional area of each one of:
the extension between the connection point to the third accumulator fluid communication path and the first chamber of the second hydraulic cylinder,
the extension between the connection point between the fourth accumulator fluid communication path and the second chamber of the first hydraulic cylinder, and
the third and fourth accumulator fluid communication fluid paths (8a, 9a).

US Pat. No. 10,337,172

HYDRAULIC CONTROL SYSTEM

Volvo Construction Equipm...

1. A hydraulic control system comprising:a flow control valve;
a variable displacement hydraulic pump connected to the flow control valve to discharge pressurized fluid toward the flow control valve;
a pump discharge pressure detector disposed on a passage between the flow control valve and the variable displacement hydraulic pump, the pump discharge pressure detector detecting a discharge pressure of the pressurized fluid discharged toward the flow control valve by the variable displacement hydraulic pump; and
a hydraulic controller comprising:
a detector connected to the pump discharge pressure detector to convert the detected discharge pressure to a pump discharge pressure value,
a comparator receiving the pump discharge pressure value from the detector, comparing the pump discharge pressure value with a pre-stored lowest recognition pressure value, and determining whether the pump discharge pressure value is higher or lower than the pre-stored lowest recognition pressure value,
a calculator cooperating with the comparator to calculate a control pressure which the variable displacement hydraulic pump is controlled based on, wherein, when the pump discharge pressure value is lower than the pre-stored lowest recognition pressure value, the calculator recognizes the control pressure as having the pre-stored lowest recognition pressure value, and
an electro-proportional pressure reducing valve connected to the variable displacement hydraulic pump to change pump displacement of the variable displacement hydraulic pump according to opening and closing operations of the electro-proportional pressure reducing valve,
wherein the calculator
receives a value of pilot pressure,
calculates a pump displacement from the value of pilot pressure with reference to a pre-stored pilot pressure-pump displacement relationship,
calculates a torque of the variable displacement hydraulic pump from the calculated pump displacement and the calculated control pressure, and
transmits a control signal to the electro-proportional pressure reducing valve such that the variable displacement hydraulic pump operates within a maximum allowable torque value.

US Pat. No. 10,337,391

DEVICE FOR COOLING AND HEATING UREA SOLUTION FOR CONSTRUCTION MACHINE, AND CONTROL METHOD THEREFOR

Volvo Construction Equipm...

1. A device for cooling and heating a urea solution for a construction machine, the device comprising:an engine including a cooling fan, a coolant pump, and a main cooler;
a urea solution tank storing the urea solution and provided with an embedded heat exchange pipe through which first coolant or second coolant circulates;
an additional coolant tank storing the second coolant for cooling the urea solution stored in the urea solution tank;
a water pump supplying the second coolant from the additional coolant tank to the heat exchange pipe;
a valve configured to be opened or closed in order to supply the first coolant by driving of the coolant pump and the second coolant of the additional coolant tank by driving of the water pump to the heat exchange pipe of the urea solution tank through a supply line, and in order to move the first coolant and the second coolant, which are heat-exchanged at the heat exchange pips of the urea solution tank, to the coolant pump and to the additional coolant tank, respectively; and
a controller outputting drive: signals to a driver of the water pump in order to supply the second coolant of the additional coolant, tank by the water pump through the valve and the supply line when a temperature of the urea solution in the urea solution tank exceeds a set temperature and to a driver of the coolant pump in order to supply the first coolant by the coolant pump to the heat exchange pipe of the urea solution tank through the valve and the supply line when the temperature of the urea solution in the urea solution tank is equal to or lower than the set temperature, and opening or closing the valve.

US Pat. No. 10,208,458

METHOD FOR COMPENSATING FOR FLOW RATE OF HYDRAULIC PUMP OF CONSTRUCTION MACHINE

Volvo Construction Equipm...

1. A method for compensating a discharge flow rate of a hydraulic pump for a construction machine, the construction machine includinga hydraulic pump connected to an engine;
a hydraulic actuator that drives the working device by operating hydraulic fluid;
a control valve installed in a flow path of the hydraulic pump;
an operation lever outputting a signal pressure corresponding to an operation amount;
means for detecting the operation amount of the operation lever;
means for detecting an engine rpm; and
a controller for controlling the control valve in response to the signal pressure corresponding to the operation amount and a detected signal corresponding to an engine rpm, the method comprising;
detecting the signal pressure corresponding to the operation amount of the operation lever, and the engine rpm;
determining a required discharge volume corresponding to the operation amount of the operation lever and a compensation ratio, and
determining a required discharge volume that compensates for the engine rpm, and
controlling a discharge flow rate of the hydraulic pump,
wherein the controlling step includes controlling the hydraulic pump so that the discharge flow rate derived from a sum of a required volume corresponding to the operation amount of the operation lever and a calculated volume that is obtained by multiplying a percentile compensation ratio by a difference value between the required volume corresponding to the operation amount of the operation lever and the required volume that compensates for the engine rpm.

US Pat. No. 10,166,573

ECCENTRIC ASSEMBLY FOR A VIBRATION COMPACTING MACHINE

Volvo Construction Equipm...

1. An eccentric assembly for a vibration compacting machine, the eccentric assembly comprising:a housing driven and rotated by a motor;
an eccentric shaft installed in the housing so as to have a changeable angular position by rotating relative to the housing;
a locking device adopted to lock the eccentric shaft by engaging with one side of the eccentric shaft, and to unlock the eccentric shaft when a rotational speed of the housing is greater than a predetermined locking critical speed ??;
a clamping device adopted to clamp an opposite side of the one side of the eccentric shaft that engages with the locking device, and to release clamping to the eccentric shaft when a rotational speed of the housing is greater than a predetermined clamping critical speed ox; and
a stopper installed in the housing so as to limit a rotation angle of the eccentric shaft generated when locking and clamping to the eccentric shaft are released.

US Pat. No. 10,144,410

APPARATUS FOR CALCULATING OPERATIONAL TIME OF HYBRID CONSTRUCTION MACHINE AND METHOD THEREFOR

VOLVO CONSTRUCTION EQUIPM...

1. A hybrid construction machine comprising;an engine;
a generator connected to the engine;
a converter connected to the generator, and an electrical storage system (“ESS”) connected to the converter, a converter current detector that is positioned between the converter and the generator and detects a current flowing from the generator to the converter and from the converter to the generator;
an ESS current detector that is positioned between the converter and the ESS, and
detects the current flowing from the converter to the ESS and from the ESS to the converter: and
a processing unit that receives the currents detected by the converter current detector as well as the ESS current detector, and calculates an operation time of a respective component;
wherein the processing unit sets the current level of ‘a’ as a current level that is generated by an electric line noise and an error, and
when RMS (Root Mean Square) value of the current detected by the converter current detector is more than 0+a,
the processing unit recognizes that the converter is under operation and counts the operation time of the converter: and
wherein the processing unit sets the current level of ‘a* as a current level that is generated by said electric line noise and said error, and
when said RMS (Root Mean Square) value of the current detected by the ESS current detector is more than 0+a, the processing unit recognizes that the ESS is under operation and counts the operation time of the ESS”.

US Pat. No. 9,926,678

FLEXIBLE SCREED

VOLVO CONSTRUCTION EQUIPM...

1. A screed for a paving machine, comprising:a flexible smoothing plate provided with a longitudinal length and an outer longitudinal end;
a vertex block located on top of the flexible smoothing plate;
a first actuator connected to the outer longitudinal end and adapted to selectively adjust an elevation of the outer longitudinal end so that the outer longitudinal end of the flexible smoothing plate forms a berm provided with a length by flexing about the vertex block and extending upward at an angle relative to an inner portion of the flexible smoothing plate; and
a second actuator connected to the vertex block that is configured to adjust the length of the berm by selectively repositioning the vertex block along the longitudinal length of the flexible smoothing plate.

US Pat. No. 10,443,522

ENGINE IDLING CONTROL SYSTEM OF CONSTRUCTION MACHINE

Volvo Construction Equipm...

1. An engine idling control method for a construction machine, the method comprising:setting, by an E-ECU, an initial engine RPM as a starting mode (S mode) by receiving a signal from a V-ECU when an engine starts;
receiving, by the E-ECU, a first instruction via an engine speed control switch in a state other than automatic idle mode;
activating the automatic idle mode when the first instruction is not input to the machine for a certain time period, and setting, by the E-ECU, the engine RPM as the starting mode (S mode);
deactivating the automatic idle mode when a second instruction is input to the machine via the engine speed control switch while the automatic idle mode is activated; and calculating, by the V-ECU, an actual torque required for a pump for operating the machine according to the second instruction when the automatic idle mode is deactivated, and sending the calculated actual torque to the E-ECU,
the method, further comprising: after setting, by the E-ECU, the initial engine RPM as the starting mode (S mode) by receiving the signal from V-ECU when the engine starts, setting, by the E-ECU, the engine RPM as a pre-mode (PreMode) when a lockout lever is input to be at a rising edge,
wherein the pre-mode is a mode in which engine speed is adapted to be changed by the engine speed control switch, and
wherein, when the lockout lever is at the rising edge, the machine enters a work mode.

US Pat. No. 10,378,184

LOAD SENSING HYDRAULIC SYSTEM FOR A WORKING MACHINE

Volvo Construction Equipm...

1. A hydraulic system for a working machine, the hydraulic system being a load sensing (LS) system and comprisinga first hydraulic actuator and a first control valve for controlling the flow of hydraulic fluid from a pump, to the first hydraulic actuator and for draining hydraulic fluid from the first hydraulic actuator, respectively,
a second hydraulic actuator and a second control valve for controlling the flow of hydraulic fluid from the pump to the second hydraulic actuator and for draining hydraulic fluid from the second hydraulic actuator, respectively,
a first hydraulic circuit for providing an LS pressure for the first actuator and a second hydraulic circuit for providing an LS pressure for the second actuator,
wherein at least one of the first and second circuits comprises an offset valve for increasing the LS pressure before providing the LS pressure to the pump, wherein the offset valve comprises
a first port for connection to the incoming LS pressure and a second port for connection to a pressure source having higher pressure than the incoming LS pressure, and
a port for providing an increased LS pressure,
a spool for selecting between a first state, where the first port is closed and the second port is opened, and a second state, where the first port is opened and the second port is closed, and
a spring arranged to apply a force on the spool in a first direction to yards the first state,
a conduit connecting the first hydraulic circuit and the spool for applying the incoming LS pressure to the spool for creating, a force in the first direction towards the first state, and
a conduit connecting the port and the spool for applying the increased LS pressure to the spool for creating a force in a second direction towards the second state.

US Pat. No. 10,377,223

WORKING MACHINE ARRANGED WITH MEANS TO DRIVE AND CONTROL A HYDRAULIC PUMP

Volvo Construction Equipm...

1. A working machine comprising an internal combustion engine, a generator, an energy storage and an electric motor for driving one or more wheels of the working machine, the internal combustion engine being arranged to drive the generator and the generator being arranged to supply power to the electric motor via the energy storage, the working machine further comprising an accelerator for controlling the electric motor, and a hydraulic pump for driving a hydraulic actuator, wherein the hydraulic pump is directly driven by the internal combustion engine, and the accelerator is arranged for controlling the speed (if the hydraulic pump by controlling the speed off the internal combustion engine, wherein the speed control of the hydraulic pump is configured such that a greater accelerator stroke corresponds to a higher pump speed.

US Pat. No. 10,337,170

DRIVING STRAIGHT AHEAD DEVICE FOR CONSTRUCTION MACHINE AND CONTROL METHOD THEREFOR

Volvo Construction Equipm...

1. A straight traveling apparatus for a construction machine comprising:a first and a second variable displacement hydraulic pumps and a pilot pump;
a left travel motor and a first working device that are operated by the first variable displacement hydraulic pump;
a plurality of control valves that are installed in a flow path of the first variable displacement hydraulic pump and control the hydraulic oil supplied to the left travel motor or the first working device;
a right travel motor and a second working device that are operated by the second variable displacement hydraulic pump;
a plurality of control valves that are installed in a flow path of the second variable displacement hydraulic pump and control the hydraulic oil supplied to the right travel motor or the second working device;
a straight travel valve that is switched by a pilot pressure induced from an electrical control valve, the straight travel valve, when being switched, supplying the hydraulic oil of one of the first and second variable displacement hydraulic pumps to the left and right travel motors while supplying the hydraulic oil of the other of the first and second variable displacement hydraulic pumps to the left and right working devices:
a pressure detection sensor for detecting a pilot pressure applied to the left and right travel motor control valves and the pilot pressure applied to the first and second working device control valves; and
a controller that outputs a control signal to the electrical control valve so that the pilot pressure applied to the straight travel valve is blocked in case that a pressure difference between the pilot pressures applied to the left and right travel motor control valves is larger than a pre-set pressure value, when the first and second working devices are operated during a travel.

US Pat. No. 10,300,759

METHOD FOR DETERMINING WHETHER OR NOT GROUND CONTACT LOSS IS IMMINENT FOR A WHEEL OF A VEHICLE

Volvo Construction Equipm...

1. A method for determining whether or not ground contact loss is imminent for a wheel of a vehicle, the vehicle comprising a vehicle body having a vertical extension in a vertical direction, the wheel being allowed to be subjected to a relative vertical displacement, in the vertical direction, in relation to the vehicle body, wherein the vehicle further is such that a maximum value of a vertical displacement of the wheel relative to the vehicle body is limited to a relative vertical displacement limit, the method comprising:determining an actual relative vertical displacement of the wheel relative to the vehicle body,
determining a limit margin as the difference between the actual relative vertical displacement and the relative vertical position limit,
determining that ground contact loss is imminent for the wheel if the limit margin is within a predetermined vertical threshold range, and
upon determining that ground contact loss is imminent, reducing torque that is transmitted to the wheel,
wherein the vehicle comprises a bogie system, the bogie system comprising a plurality of wheels and the bogie system being such that each one of the wheels is allowed to be subjected to a relative vertical displacement in relation to the vehicle body.

US Pat. No. 10,119,248

GUARDRAIL FOR CONSTRUCTION EQUIPMENT

VOLVO CONSTRUCTION EQUIPM...

1. A guardrail for construction equipment comprising:a lower guardrail part attachable to a construction equipment;
an upper guardrail part connected to an upper portion of the lower guardrail part; and
a connector disposed between the lower guardrail part and the upper guardrail part to connect the lower guardrail part and the upper guardrail part, the connector allowing the upper guardrail part to move in a direction of the lower guardrail part such that a height of the guardrail including the upper guardrail part and the lower guardrail part is adjustable, the connector allowing the upper guardrail part to slide in a top-bottom direction with respect to the lower guardrail part acting as a fixed shaft, the connector including a first bracket and a second bracket, the first bracket connecting one side of the lower guardrail part and one side of the upper guardrail part, the second bracket connecting the other side of the lower guardrail part and the other side of the upper guardrail part, the first bracket being welded to the lower guardrail part and connected to the upper guardrail part using a bolt, the first bracket having a rail hole to guide a movement of the bolt,
wherein the rail hole comprises a horizontal section, a first vertical section extending from one end of the horizontal section, and a second vertical section extending from the other end of the horizontal section to be parallel to an longer than the first vertical section.

US Pat. No. 10,494,791

FLOW CONTROL VALVE FOR CONSTRUCTION MACHINE

Volvo Construction Equipm...

1. A flow control valve for a construction machine, the flow control valve controlling hydraulic fluid supplied from a hydraulic pump to a hydraulic actuator, the flow control valve comprising:a boom valve block connected to the hydraulic pump;
a boom spool slidably installed in the boom valve block and shifted to control hydraulic fluid supplied from the hydraulic pump to a boom cylinder in response to pilot signal pressure supplied to perform a boom-up or boom-down operation; and
a boom-down flow control system for returning a first part of hydraulic fluid returning from a large chamber of the boom cylinder to a hydraulic tank, through the boom spool only at a predetermined pressure or higher when the boom spool is shifted to perform the boom-down operation, for returning a second part of the hydraulic fluid returning from the large chamber of the boom cylinder directly to the hydraulic tank through the boom spool, and for allowing a third part of the hydraulic fluid returning from the large chamber of the boom cylinder to join a small chamber of the boom cylinder as a regeneration flow when the boom spool moves over a predetermined section;
wherein the boom-down flow control system includes a boom booster poppet mounted on the boom valve block in a first path for returning the first part of the hydraulic fluid returning from the large chamber of the boom cylinder to the hydraulic tank through a first spool notch of the boom spool, the boom booster poppet to be opened only at the predetermined pressure or higher during the boom-down operation; and
wherein the boom-down flow control system includes a second spool notch provided to be spaced apart from the first spool notch of the boom spool and to communicate with a second path for returning the second part of the hydraulic fluid returning from the large chamber of the boom cylinder to the hydraulic tank so as to return the second part of the hydraulic fluid directly to the hydraulic tank without passing through the boom booster poppet when the boom spool moves over the predetermined section during the boom-down operation.

US Pat. No. 10,422,416

TRANSMISSION ARRANGEMENT FOR A VEHICLE

Volvo Construction Equipm...

1. A transmission arrangement for a vehicle, the transmission arrangement comprising a first, a second, a third, and a fourth planetary gear set comprising a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further comprises a transmission housing, an input shaft and an output shaft, whereinthe ring gear of the first planetary gear set and the input shaft are operatively connected to each other;
the planet carrier of the first planetary gear set and the planet carrier of the second planetary gear set are operatively connected to each other;
the sun gear of the first planetary gear set and the ring gear of the third planetary gear set are operatively connected to each other;
the ring gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other;
the planet carrier of the third planetary gear set and the sun gear of the fourth planetary gear set are operatively connected to each other; and
the planet carrier of the fourth planetary gear set and the output shaft are operatively connected each other.

US Pat. No. 10,655,297

HYDRAULIC SYSTEM AND A METHOD FOR MOVING AN IMPLEMENT OF A WORKING MACHINE

Volvo Construction Equipm...

1. A hydraulic system for moving an implement of a working machine, the hydraulic system comprising:a hydraulic cylinder with a cylinder and a piston which is adapted to move in the cylinder to thereby move the implement relative to a body structure of the working machine,
an actuator pump arranged to provide hydraulic fluid to the hydraulic cylinder the hydraulic cylinder having a first port and a second port adapted to be in fluid communication with the actuator pump, the hydraulic cylinder and the actuator pump being arranged so that the hydraulic cylinder is directly controlled by the actuator pump so that the rate of movement of the piston of the hydraulic cylinder is purely pump controlled,
a hydraulic accumulator for suspension of the implement,
an electronically controlled suspension control valve arranged in fluid communication between the first port and the hydraulic accumulator, wherein the hydraulic accumulator is arranged to be selectively connectable to the first port,
a further pump in addition to the actuator pump, the hydraulic accumulator being arranged to be pressurised by the further pump, and
a control unit arranged to control the electronically suspension control valve to disconnect the hydraulic accumulator from the first port.

US Pat. No. 10,550,868

LOAD SENSING HYDRAULIC SYSTEM FOR A WORKING MACHINE, AND A METHOD FOR CONTROLLING A LOAD SENSING HYDRAULIC SYSTEM

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic system for a working machine, the hydraulic system being a load sensing system and comprising a hydraulic actuator for movement of an implement and a control valve having an inlet valve and an outlet valve for controlling the flow of hydraulic fluid from a pump to the hydraulic actuator and for draining hydraulic fluid from the hydraulic actuator, respectively, and a means for determining the load on the hydraulic actuator, wherein the hydraulic system comprises a valve for disconnecting the flow of hydraulic fluid from the pump to the hydraulic actuator, while allowing another flow of hydraulic fluid to the hydraulic actuator, provided that the determined load on the hydraulic actuator exceeds a threshold value, wherein the hydraulic system comprises a valve for preventing an LS-signal based on the load on the hydraulic actuator from reaching the pump when the pump is disconnected, wherein the valve for preventing an LS-signal based on the load on the hydraulic actuator from reaching the pump when the pump is disconnected and the valve for disconnecting the flow of hydraulic fluid from the pump to the hydraulic actuator provided that a determined load on the hydraulic actuator exceeds a threshold value, is one and the same valve.

US Pat. No. 10,428,491

FLOW RATE CONTROL APPARATUS OF CONSTRUCTION EQUIPMENT AND CONTROL METHOD THEREFOR

Volvo Construction Equipm...

1. A flow rate control apparatus for construction equipment, the apparatus comprising:first and, second variable displacement hydraulic pumps and a pilot pump;
a boom cylinder driven by a hydraulic fluid of the first hydraulic pump;
a first control valve controlling a flow of the hydraulic fluid supplied from the first hydraulic pump to the boom cylinder;
an option actuator driven by a hydraulic fluid of the second hydraulic pump;
a second control valve controlling a flow of the hydraulic fluid supplied from the second hydraulic pump to the option actuator;
a boom cylinder manipulation lever for inputting a manipulation signal to control the first control valve, and an option actuator manipulation lever for inputting a manipulation signal to control the second control valve;
a confluence line connected at an inlet port thereof to a downstream side of a supply path of the first hydraulic pump, and connected at an outlet port thereof to a meter-in port of the second control valve;
a center bypass switching valve provided in the furthest downstream side of the supply path of the first hydraulic pump, and operated to close an opening port thereof by a pilot pressure applied thereto;
a confluence switching valve provided in the confluence line, and joining a part of the hydraulic fluid supplied from the first hydraulic pump to the boom cylinder with the hydraulic fluid of the option actuator when the confluence switching valve is operated to open an opening port thereof;
a confluence selection valve provided in a fluid path between the pilot pump and the confluence switching valve, and applying the pilot pressure to the confluence switching valve when the confluence switching valve is operated; and
a controller controlling the confluence selection valve to block the pilot pressure supplied from the pilot pump to the confluence switching valve so that the confluence line becomes closed when combined work of the boom cylinder and the option actuator is performed.

US Pat. No. 10,392,782

CONTROL VALVE FOR CONSTRUCTION EQUIPMENT

Volvo Construction Equipm...

1. A control valve for construction equipment comprising;a valve body having a primp passage to which hydraulic fluid is supplied from a hydraulic pump, a supply passage that is configured to communicate with the pump passage, and actuator ports that is connected to an actuator;
a spool that is installed within the valve body and shifted to enable the hydraulic fluid of the hydraulic pump to be supplied to the actuator through one of the actuator ports, and to return the hydraulic fluid discharged from the actuator to the tank passage through the other of the actuator ports;
a holding valve that is provided with a holding poppet which is formed on one of the actuator ports and an auxiliary spool which is connected to a back pressure chamber of the holding poppet and shifted by a pilot pressure so as to release a holding load of the actuator; and
a pilot pressure control valve that is shiftably installed within the holding valve and configured to apply or block the pilot pressure to the control valve through flow paths, wherein the pilot pressure control valve is to be shifted by a pressure of hydraulic fluid drained from the back pressure chamber of the holding poppet when the auxiliary spool is shifted.

US Pat. No. 10,352,023

POWER CONNECTION DEVICE

Volvo Construction Equipm...

1. A power connection device for transmitting electric power from an external power source to a working machine having an undercarriage and a superstructure, the undercarriage and the superstructure being pivotable relative to each other about a substantially vertical pivot axis, wherein the power connection device comprisesa first power conductor member which is configured to be pivotally arranged relative to the undercarriage and the superstructure about the substantially vertical pivot axis,
a lower attachment component configured to be attached to a upper surface of the undercarriage, and
an upper attachment component configured to be attached to a lower surface of the superstructure, the first power conductor member being slidingly arranged between the lower and upper attachment components allowing the first power conductor member to pivot relative to the lower and upper attachment components.

US Pat. No. 10,294,637

TOOTH AND ADAPTOR FOR ATTACHMENT OF THE TOOTH TO A WORKING MACHINE

Volvo Construction Equipm...

1. A tooth (1) for attachment to the lip of a bucket of a working machine via an adaptor,the tooth having an exterior surface comprising two externally opposed outer working surfaces, namely a first working surface (12) and a second working surface (14), the working surfaces (12, 14) having a width (W) in a horizontal direction (H), intended to extend along said lip of a bucket, and having a length (L) extending between an attachment end and a tip (16) of said tooth, the working surfaces (12, 14) extending along said length (L) while converging in a vertical direction (V) to be connected at said tip (16) of the tooth, the tooth (1) further comprising:
a cavity (103) for receiving a portion of said adaptor, the cavity (103) extending between said first and second opposed outer working surfaces (12, 14) from an open end (104), at said attachment end of the tooth, to a bottom end (105); the cavity (103) being delimited by inner walls (102);
said inner walls (102) comprising:
first and second internally facing inner walls (106, 107), which define internal surfaces associated with said first outer working surface and said second working outer surface (12,14), respectively; and
opposing side walls (108), interconnecting said first and second inner walls (106, 107),
the opposing side walls (108) delimiting opposing through holes (109) for receiving a pin extending through the cavity (103) for attachment of the tooth (1) to the adaptor portion;
a first axis X being defined extending through the centres of the opposite through holes (109);
a second axis Y extending along the cavity (103) from the open end (104) of the cavity towards the bottom end (105) of the cavity; and
a third axis Z being orthogonal to said first and second axes X, Y;
the three axes X, Y, Z thereby forming an orthogonal axes system, meeting at an origo, whereby each point of the inner wall (102) may be defined by Cartesian coordinates (x, y, z);
wherein
the cavity defining:
a back portion (BP) extending along the Y axis, the back portion being at least partially located between the plane spanned by the X and Z axes and the open end (104) of the cavity,
a front portion (FP) extending along the Y axis, the front portion being located between the plane spanned by the X and Z axes and the bottom end (105) of the cavity; and
a stepped portion (SP), interconnecting the back portion and the front portion;
in the back portion, the first and second inner walls (106, 107), each comprises a pair of essentially planar back contact surfaces (130a, b; 140a,b), each pair of back contact surfaces being symmetrical about, and facing away from, the plane spanned by the Z and Y axes, so as to form an angle (beta, gamma) with the plane spanned by the X and Y axes being less than 35 degrees, each pair of back contact surfaces (130a, b; 140 a,b) being separated by a back divider region (132, 142), extending beyond the pair of back contact surfaces (130a, b) in the Z direction away from the XY plane;
in the front portion, the first and second inner wall (106, 107) each comprises a pair of essentially planar front contact surfaces (110a,b, 120a,b), being symmetrical about the plane spanned by the Z and Y axes;
all contact surfaces forming an angle (alfa) less than 5 degrees with the Y axis, as seen in any plane parallel to the plane spanned by the Z and Y axes;
the front contact surfaces of the first inner wall and/or second inner wall (110a,b; 120a,b) being located closer to the plane spanned by the X and Y axes than the corresponding back contact surfaces (130a,b, 140 a,b); and
in the stepped portion, the first and/or second inner wall (106, 107) forming a slope (150a,b) wherein at least a portion of the inner wall approaches the XY plane towards the bottom wall (105), interconnecting said back contact surfaces (130a,b, 140a,b) of the first inner wall and/or second inner wall and the corresponding front contact surface (110a,b; 120a,b);
wherein a first stepped distance (D1) along the Z axis is bridged by the first inner wall (106) along the stepped portion (SP), between the first back contact surfaces (130) and the first front contact surfaces (110); and
wherein a second stepped distance (D2) along the Z axis is bridged by the second inner wall (107) along the stepped portion (SP), between the second back contact surfaces (140) and the second front contact surfaces (120); wherein 0<=D2<=0.80 D1.

US Pat. No. 10,633,824

CONTROL METHOD FOR CONTROLLING A MOVABLE MEMBER OF AN EXCAVATOR AND EXCAVATOR COMPRISING A CONTROL UNIT IMPLEMENTING SUCH A CONTROL METHOD

VOLVO CONSTRUCTION EQUIPM...

1. A control method, for controlling a movable member of an excavator, the control method including a step of:providing the excavator including at least:
the movable member configured to hold a load when the excavator is in service,
an electric actuator configured to actuate the movable member, the electric actuator comprising: i) an electric motor which is reversible and which is configured to apply a motor force on the electric actuator, and ii) a static brake configured to generate a brake force so as to brake the electric actuator,
a control unit configured to control, the electric motor and the static brake, and
a motion sensor unit configured to detect a motion of the electric actuator and to send motion signals to the control unit,
wherein the static brake is configured to generate an upper threshold brake force and the electric motor is configured to generate an upper threshold motor force, the upper threshold brake force being inferior to the upper threshold motor force, and
wherein the control method includes at least:
performing an immobilization step wherein the control unit controls the static brake to generate the upper threshold brake force,
performing a slippage detection step wherein the control unit checks the motion signals in order to detect whether the electric actuator is moving in a slippage direction despite the static brake generating the upper threshold brake force,
in case the control unit detects that the electric actuator is moving in the slippage direction, performing a motor energizing step wherein the control unit controls a power supply to the electric motor so that the electric motor generates a motor force substantially equal or superior to the upper threshold brake force in a direction opposite to the slippage direction, and
after start of the motor energizing step and in case the electric motor generates a non null motor force, performing a brake release step wherein the control unit releases at least partially the static brake.

US Pat. No. 10,633,829

SPOOL VALVE

Volvo Construction Equipm...

1. A spool valve comprising:a valve block;
a first spool disposed on one side within the valve block to be reciprocally movable in a longitudinal direction, and having a first notch provided in an outer circumferential surface thereof to be aligned with a first pump path and a first cylinder path provided within the valve block, wherein the first spool controls a connection between the first pump path and the first cylinder path using the first notch when moving in response to a change in a stroke thereof;
a second spool disposed in the other side within the valve block to be reciprocally movable in a longitudinal direction, and having a second notch provided in an outer circumferential surface thereof to be aligned with a second cylinder path and a first tank path provided within the valve block, wherein the second spool controls a connection between the second cylinder path and the first tank path using the second notch when moving in response a change in a stroke thereof;
a third spool disposed within the valve block to face the second spool in a top-bottom direction and to be reciprocally movable in a longitudinal direction, and having a third notch provided in an outer circumferential surface thereof to be aligned with a second pump path and a third cylinder path provided within the valve block, wherein the third spool controls a connection between the second pump path and the third cylinder path using the third notch when moving in response to a change in a stroke thereof;
a fourth spool disposed within the valve block to face the first spool in a top-bottom direction and to be reciprocally movable in a longitudinal direction, and having a fourth notch provided in an outer circumferential surface thereof to be aligned with a fourth cylinder path and a second tank path provided within the valve block, wherein the fourth spool controls a connection between the fourth cylinder path and the second tank path using the fourth notch when moving in response to a change in a stroke thereof;
a first spool cap coupled to the valve block, connected to the first spool, and providing a first port through which a pilot pressure is applied to change the stroke of the first spool;
a second spool cap coupled to the valve block, connected to the second spool, and providing a second port through which a pilot pressure is applied to change the stroke of the second spool;
a third spool cap coupled to the valve block, connected to the third spool, and providing a third port through which a pilot pressure is applied to change the stroke of the third spool; and
a fourth spool cap coupled to the valve block, connected to the fourth spool, and providing a fourth port through which a pilot pressure is applied to change the stroke of the fourth spool.

US Pat. No. 10,533,641

TRANSMISSION ARRANGEMENT FOR A VEHICLE

VOLVO CONSTRUCTION EQUIPM...

1. A transmission arrangement for a vehicle, the transmission arrangement comprising a first, a second, a third, and a fourth planetary gear set comprising a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further comprises a transmission housing, an input shaft and an output shaft, whereinthe planet carrier of the first planetary gear set and the output shaft are operatively connected to each other;
the ring gear of the first planetary gear set and the planet carrier of the second planetary gear set are operatively connected to each other;
the sun gear of the first planetary gear set and the sun gear of the second planetary gear set are operatively connected to each other; and
the ring gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other,
wherein one of the sun gear, the planet carrier and the ring gear of the fourth planetary gear set is operatively connected to one of the input shaft, the sun gear, the planet carrier and the ring gear of the third planetary gear set,
wherein another one of the sun gear, the planet carrier and the ring gear of the fourth planetary gear set is operatively connected to one of the input shaft, the sun gear, the planet carrier and the ring gear of the third planetary gear set,
wherein the transmission arrangement comprises a first connecting mechanism for selectively connecting the planet carrier of the second planetary gear set to the ring gear of the third planetary gear set, and
wherein the transmission arrangement comprises a second connecting mechanism for selectively connecting the sun gear of the third planetary gear set to the planet carrier of the second planetary gear set and to the ring gear of the first planetary gear set.

US Pat. No. 10,519,622

EXCAVATOR ARM, EXCAVATOR CANTILEVER MEMBER INCLUDING SUCH AN EXCAVATOR ARM AND EXCAVATOR INCLUDING SUCH AN EXCAVATOR CANTILEVER MEMBER

VOLVO CONSTRUCTION EQUIPM...

1. An excavator arm, configured to equip an excavator, the excavator arm including at least:a frame comprising i) a boom linkage part configured to swingably link the excavator arm to an excavator boom about a boom axis, and ii) a tool linkage part configured to swingably link the excavator arm to a tool about a tool axis, the boom axis and the tool axis substantially extending in a frame plane,
an arm linear actuator extending substantially along a longitudinal axis, the arm linear actuator having i) a proximal linkage part linked to the frame about a proximal linkage axis and ii) a distal linkage part linked to the frame about a distal linkage axis, the proximal linkage axis and the distal linkage axis extending substantially in an actuator plane, and
an electric motor configured to drive the arm linear actuator, wherein the electric motor is arranged on the side of the frame plane with respect to the actuator plane.

US Pat. No. 10,495,188

TRANSMISSION ARRANGEMENT FOR A VEHICLE

Volvo Construction Equipm...

1. A transmission arrangement for a vehicle, the transmission arrangement comprising a first, a second, a third, and a fourth planetary gear set comprising a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further comprises a transmission housing, an input shaft and an output shaft, whereinthe ring gear of the first planetary gear set and the input shaft are operatively connected to each other;
the planet carrier of the first planetary gear set and the planet carrier of the second planetary gear set are operatively connected to each other;
the sun gear of the first planetary gear set and the ring gear of the third planetary gear set are operatively connected to each other;
the ring gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other;
the planet carrier of the third planetary gear set and the sun gear of the fourth planetary gear set are operatively connected to each other; and
the planet carrier of the fourth planetary gear set and the output shaft are operatively connected each other.

US Pat. No. 10,487,461

ECCENTRIC ASSEMBLY FOR OSCILLATING A COMPACTING DRUM OF A COMPACTING MACHINE

Volvo Construction Equipm...

1. An eccentric assembly for oscillating a compacting drum of a compacting machine, the eccentric assembly comprising:a central disk rotatably mounted to the compacting drum to have an axis disposed in juxtaposition with an axis of the compacting drum, and configured to be rotatably driven by a motor;
a pair of opposed eccentric shafts, each axis of which is disposed equidistantly from the center of the axis of the central disk, the eccentric shafts being rotatably mounted to the compacting drum such that the three axes of the central disk and the eccentric shafts are in the same plane; and
a yoke disposed between the central disk and the two eccentric shafts in such a manner as to be connected to the central disk and the two eccentric shafts, respectively, by means of three connecting members, wherein one end of each of the connecting members is rotatably coupled to different positions of the yoke, and the other end thereof is fixed to a corresponding one of the central disk and the two eccentric shafts such that the two eccentric shafts rotate synchronously by the rotation of the central disk.

US Pat. No. 10,472,801

SYSTEM FOR MEASURING FRICTION FORCE OF EXCAVATOR SWING DEVICE FOR SUPPLYING LUBRICATING OIL

Volvo Construction Equipm...

1. An excavator comprising:at least one gyro configured to detect a slope of an excavator;
a swing motor that rotates an upper body of the excavator;
a first pressure sensor that detects an operational hydraulic pressure value applied to the swing motor;
a swing joystick for driving the swing motor;
a second pressure sensor that detects an operational value inputted to the swing joystick; and,
a controller that receives an information detected by the gyro sensor, the first pressure sensor, and the second pressure sensor, and detects the operational hydraulic pressure value of the swing motor by the first pressure sensor when a maximum manipulation is applied to the joystick for more than a minimum measurement time at a swing measurement mode,
wherein the minimum measurement time is set to be longer than a time taken for the swing motor to reach a maximum speed when the swing motor swings the upper body of the excavator, for which the upper body of the excavator maintains a posture having a minimum inertia moment of rotation in which a working device of the excavator is disposed proximate a rotation axis of the upper body of the excavator and the swing joystick is manipulated to a maximum extent.

US Pat. No. 10,472,802

LEAK PREVENTION APPARATUS FOR OPERATOR CABIN OF CONSTRUCTION EQUIPMENT

Volvo Construction Equipm...

1. A leakage prevention apparatus for a cabin of construction equipment, comprising:a first plate configured to be coupled to a frame of a cabin of a piece of construction equipment;
a second plate configured to extend from the first plate such as to face a lower windshield of the cabin;
a damper configured to press the lower windshield, the damper displaceably coupled to the second plate to adjust an amount of force pressing the lower windshield;
block walls provided at distances from both sidewalls of the frame to face the both sidewalls, respectively, the both sidewalls guiding side portions of the lower windshield; and
a weather strip arranged along peripheral portions of the lower windshield in contact with the lower windshield and connected to the block walls, thereby forming flow paths in a vertical direction between the block walls and the both sidewalls of the frame.

US Pat. No. 10,414,402

METHOD FOR CONTROLLING GEAR SHIFTING OF A WORKING MACHINE

Volvo Construction Equipm...

1. Method for controlling gear shifting of a working machine, wherein the working machine is provided with a set of drive units, each drive unit comprising at least one drive wheel and a drive motor capable of applying a torque to the drive wheel that results in a traction force of the drive wheel, and wherein at least a first drive unit comprises a gearbox providing at least two forward gears for the at least one drive wheel,the method comprising:determining a representation of a first total tractive force of the working machine for the entire set of drive units,
initiating a procedure for redistributing the tractive force while maintaining the first total tractive force, comprising
decreasing, at least partly down towards a level suitable for shifting gear, the torque and tractive force of at least the first drive unit, and
increasing, in a compensational manner, the torque and tractive force of at least one of the other drive units not subject to gear shifting,
monitoring, during the redistribution procedure, a representation of a second total tractive force of the working machine for the other drive units not subject to gear shifting, and, provided that the second total tractive force exceeds a threshold limit that forms a function of the first total tractive force:
decreasing the torque and tractive force of at least the first drive unit down to the level suitable for shifting gear and performing gear shifting for at least the first drive unit.

US Pat. No. 10,358,960

TORQUE CONTROL SYSTEM FOR DPF REGENERATION

Volvo Construction Equipm...

1. An engine torque control method for calibrating an engine torque optimized for DPF regeneration, comprising:entering DPF regeneration mode;
detecting outputs of gear pump and main pump as parameters for calibrating conditions of DPF regeneration condition;
increasing flow rate of gear pump or main hydraulic pump;
controlling an engine torque to reach a predetermined target engine torque value according to the increase of the flow rate of the gear pump or the main hydraulic pump;
starting the DPF regeneration if the engine torque reaches the predetermined target engine torque value;
increasing an engine rpm based on the predetermined target engine torque value during the DPF regeneration;
carrying out the DPF regeneration until an exhaust gas temperature reaches a predetermined target temperature;
checking if a vehicle is under a state possible for the DPF regeneration when the DPF regeneration is required;
checking if a precondition for the DPF regeneration is satisfied, wherein the DPF regeneration mode gets started if the precondition is satisfied, wherein the step of checking if the precondition for the DPF regeneration is satisfied comprises checking whether or not a control lock-out lever is released, and checking whether or not an idling mode exists; and
cancelling the regeneration if the engine torque value does not reach a predetermined target engine torque value in the step of controlling the engine torque to reach the predetermined target engine torque value according to the increase of the flow rates of the gear pump or the main hydraulic pump.

US Pat. No. 10,655,527

ARRANGEMENT AND A METHOD FOR CONTROLLING THE TEMPERATURE OF AIR BEING FED TO A VEHICLE ENGINE

Volvo Construction Equipm...

1. An arrangement for controlling the temperature of air being fed to a vehicle engine, the arrangement comprising an engine compartment in which the engine is arranged, the engine compartment being provided with an ambient air intake allowing an airflow into the engine compartment, the engine being provided with an engine air intake arranged inside the engine compartment, and an air fan for forcing the airflow via the ambient air intake into the inside of the engine compartment, the engine air intake being arranged in a position allowing at least a substantial part of the airflow to enter the engine air intake wherein the air fan is arranged for selectively being operated in:a first mode of operation with a relatively high speed for providing an airflow from the ambient air intake to the engine air intake, thereby decreasing the temperature of the air flowing into the engine air intake; or
a second mode of operation with a relatively low speed for providing an airflow from within the engine compartment to the engine air intake, thereby increasing the temperature of the air flowing into the engine air intake.

US Pat. No. 10,639,982

WORKING MACHINE AND A METHOD FOR OPERATING A WORKING MACHINE

Volvo Construction Equipm...

1. A working machine comprisinga prime mover for supplying torque to driving wheels of the working machine, and
a transmission line arranged between the prime mover and the driving wheels for transmitting torque from the prime mover to the driving wheels, the transmission line comprising a gearbox arranged between the prime mover and the wheels,
at least one hydraulic machine in a hydraulic system for moving an implement arranged on the working machine and/or steering the working machine, and
an electric machine for driving or braking the driving wheels and/or for driving or braking the at least one hydraulic machine, the electric machine being arranged in parallel with the prime mover with respect to the transmission line such that torque can be provided to the wheels by either one or both of the prime mover and the electric machine, and being mechanically connected to the transmission line between the prime mover and the gearbox,
wherein the transmission line comprises a transmission component for engagement and disengagement of the prime mover relative to the driving wheels, the transmission component being arranged between the prime mover and the electric machine, the hydraulic machine is mechanically connected to the transmission line between the prime mover and the gearbox, and the gearbox is a continuously variable transmission having a variator unit, and the gearbox has an operation mode where the rotation speed of an output shaft of the gearbox is zero or close to zero independently of the rotation speed of an input shaft of the gearbox at the same time as torque can be transmitted from the input shaft to the output shaft.

US Pat. No. 10,584,771

TRANSMISSION ARRANGEMENT FOR A VEHICLE

VOLVO CONSTRUCTION EQUIPM...

1. A transmission arrangement for a vehicle, the transmission arrangement comprising a first, a second, a third, and a fourth planetary gear set comprising a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further comprises a transmission housing, an input shaft and an output shaft, whereinthe ring gear of the first planetary gear set and the input shaft are operatively connected to each other;
the sun gear of the first planetary gear set and the sun gear of the second planetary gear set are operatively connected to each other;
the planet carrier of the second planetary gear set and the ring gear of the third planetary gear set are operatively connected to each other;
the planet carrier of the third planetary gear set is operatively connected to the transmission housing;
the sun gear of the third planetary gear set and the sun gear of the fourth planetary gear set are operatively connected to each other; and
the planet carrier of the fourth planetary gear set and the output shaft are operatively connected to each other.

US Pat. No. 10,584,772

TRANSMISSION ARRANGEMENT FOR A VEHICLE

VOLVO CONSTRUCTION EQUIPM...

1. A transmission arrangement for a vehicle, the transmission arrangement comprising a first, a second, a third, and a fourth planetary gear set comprising a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further comprises a transmission housing, an input shaft and an output shaft, whereinthe sun gear of the first planetary gear set and the input shaft are operatively connected to each other;
the ring gear of the first planetary gear set and the ring gear of the second planetary gear set are operatively connected to each other;
the planet carrier of the second planetary gear set and the sun gear of the third planetary gear set are operatively connected to each other;
the sun gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other;
the planet carrier of the third planetary gear set and the ring gear of the fourth planetary gear set are operatively connected to each other; and
the planet carrier of the fourth planetary gear set and the output shaft are operatively connected to each other.

US Pat. No. 10,576,820

WHEEL HUB UNIT

VOLVO CONSTRUCTION EQUIPM...

1. A wheel hub unit comprisingat least one planetary gear set comprising a sun gear, one set of planet gears, a carrier, and a ring gear, wherein each of the planet gears of the set of planet gears is provided with planet gear teeth adapted for engagement with corresponding ring gear teeth of the ring gear, wherein the ring gear teeth of the ring gear are directed inwards as seen in the radial direction of the wheel hub unit, wherein the ring gear teeth engage the planet gear teeth at an engagement area in which the planet gear teeth of the planet gears overlap the ring gear teeth of the ring gear,
a bearing, comprising an inner bearing ring, an outer bearing ring and rolling elements,
wherein the inner bearing ring is formed by a surface of the ring gear of the planetary gear set, the surface being directed outwards as seen in the radial direction of the wheel hub unit,
wherein each of the respective rolling elements is in contact with the surface of the inner bearing ring,
wherein a center of each of the respective rolling elements is axially displaced in relation to the engagement area, and
wherein the inner ring of the bearing is a split inner ring comprising two parts, wherein both parts of the split inner bearing ring are in contact with the rolling elements of the bearing.

US Pat. No. 10,578,136

HYDRAULIC FLUID TANK ARRANGEMENT

VOLVO CONSTRUCTION EQUIPM...

1. A hydraulic fluid tank arrangement for a working machine, the arrangement comprisinga hydraulic fluid tank;
an inlet portion, wherein the inlet portion receives hydraulic fluid into the hydraulic fluid tank;
an oil filter arranged in fluid communication with the inlet portion;
a cyclone deaerator arranged in fluid communication with the oil filter downstream the inlet portion and upstream the oil filter, wherein the cyclone deaerator removes gas from the hydraulic fluid before the hydraulic fluid reaches the oil filter,
the hydraulic fluid tank comprising a first hydraulic fluid chamber,
the cyclone deaerator being arranged in fluid communication with the first hydraulic fluid chamber, wherein the cyclone deaerator provides gas removed from the hydraulic fluid into the first hydraulic fluid chamber,
a venting filter arranged in communication with the first hydraulic fluid chamber, wherein the venting filter directs gas in the first hydraulic fluid chamber out from the hydraulic fluid tank arrangement,
a second hydraulic fluid chamber, the second hydraulic fluid chamber being arranged downstream the oil filter in fluid communication with the oil filter and the outlet portion of the hydraulic fluid tank arrangement, and
a separation wall dividing the hydraulic fluid tank into the first hydraulic fluid chamber and the second hydraulic fluid chambers, the separation wall extending from an upper wall of the hydraulic fluid tank to a level below the gas outlet portion, wherein the first hydraulic fluid chamber is in filter-free fluid communication with the second hydraulic fluid chamber.

US Pat. No. 10,458,095

CONTROL METHOD FOR CONTROLLING AN EXCAVATOR AND EXCAVATOR COMPRISING A CONTROL UNIT IMPLEMENTING SUCH A CONTROL METHOD

VOLVO CONSTRUCTION EQUIPM...

1. A control method, for controlling an excavator, the control method including a step of:providing an excavator including at least:
several movable members, each movable member being configured to move at least a part of the excavator,
at least one actuating set comprising at least two actuators, the at least two actuators including at least one electric actuator, each actuator being configured to actuate at least one of the movable members,
at least one static brake movable between: i) a locking position where the at least one static brake locks the at least one electric actuator, and ii) an unlocking position where the at least one static brake unlocks the at least one electric actuator,
a command device configured to receive commands from an operator and to generate command signals based on the commands,
a control unit configured to receive the command signals and to control the actuators and the at least one static brake based on the command signals,
the control method further including at least:
a reception step wherein the control unit receives a command signal,
an actuation check step wherein the control unit checks whether the command signal requires the control unit to actuate at least one actuator belonging to the at least one actuating set, and
an unlocking step, after the command signal requires the control unit to actuate an actuator belonging to the at least one actuating set, wherein the control unit controls the at least one static brake so that the at least one static brake moves towards its unlocking position.