US Patent No. 10,408,140

ENGINE CONTROL IN FUEL AND/OR CYLINDER CUT OFF MODES BASED ON INTAKE MANIFOLD PRESSURE


Patent No. 10,408,140
Issue Date September 10, 2019
Title Engine Control In Fuel And/or Cylinder Cut Off Modes Based On Intake Manifold Pressure
Inventorship Xin Yuan, Palo Alto, CA (US)
Louis J. Serrano, Los Gatos, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,408,140

1. A controller configured to control operation of an engine in a vehicle, the controller configured to:deactivate all working chambers of the engine in a cylinder cut off mode such that none of the working chambers are fired and no air is pumped through the working chambers from an air intake manifold to an exhaust system of the vehicle;
determining when the operation of the engine is to transition from the cylinder cut off mode to a second operational mode in response to an input to the controller;
measure intake manifold absolute pressure (MAP) in the air intake manifold; and
if the measured MAP is larger than a threshold MAP:
determine, based on the measured MAP, a number of working cycle(s) needed to pump down the measured MAP to below the threshold MAP;
operate the engine so as to pump air from the air intake manifold to the exhaust system through one or more of the working chambers of the engine for the determined number of working cycle(s); and
operate the engine in the second operational mode after the pumping of the air for the determined number of working cycle(s).