US Patent No. 9,267,377

COUPLING DEVICE FOR CONNECTING A BRAKE INPUT ELEMENT TO A MAIN BRAKE CYLINDER AND METHOD FOR OPERATING SUCH A COUPLING DEVICE


Patent No. 9,267,377
Issue Date February 23, 2016
Title Coupling Device For Connecting A Brake Input Element To A Main Brake Cylinder And Method For Operating Such A Coupling Device
Inventorship Timo Jahnz, Hessigheim (DE)
Assignee ROBERT BOSCH GMBH, Stuttgart (DE)

Claim of US Patent No. 9,267,377

15. A method for operating a coupling apparatus with which a braking input element is connected to a brake master cylinder
of a vehicle, the coupling apparatus having (i) an input piston disposed on the braking input element in such a way that upon
actuation of the braking input element, the input piston is displaced out of an initial position over a brake application
distance, and (ii) an output piston to which a driver braking force exerted onto the braking input element is transferred
via the input piston displaced out of the initial position over at least one predefined first minimum brake application distance,
the output piston being disposed on the brake master cylinder in such a way that an internal pressure in the brake master
cylinder is increased by way of the driver braking force transferred via the input piston to the output piston, the method
comprising:
operating the coupling apparatus in a first operating mode in which the input piston displaced out of the initial position
over a brake application distance less than the predefined first minimum brake application distance is spaced apart from the
output piston in such a way that a force transfer from the input piston to the output piston is suppressed; and

selectively switching the coupling apparatus into at least a second operating mode having a second minimum brake application
distance less than the first minimum brake application distance, wherein in the second operating mode the input piston displaced
out of the initial position over a brake application distance less than the predefined second minimum brake application distance
is spaced apart from the output piston in such a way that a force transfer from the input piston to the output piston is suppressed,
and the driver braking force is transferred via the input piston displaced out of the initial position over a brake application
distance between the predefined second minimum brake application distance and the predefined first minimum brake application
distance, to the output piston.