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Control system for a hybrid powertrain system

United States Patent

8,827,865
September 9, 2014
View the Complete Patent at the US Patent & Trademark Office
A vehicle includes a powertrain with an engine, first and second torque machines, and a hybrid transmission. A method for operating the vehicle includes operating the engine in an unfueled state, releasing an off-going clutch which when engaged effects operation of the hybrid transmission in a first continuously variable mode, and applying a friction braking torque to a wheel of the vehicle to compensate for an increase in an output torque of the hybrid transmission resulting from releasing the off-going clutch. Subsequent to releasing the off-going clutch, an oncoming clutch which when engaged effects operation of the hybrid transmission in a second continuously variable mode is synchronized. Subsequent to synchronization of the oncoming clutch, the oncoming clutch is engaged.
Naqvi; Ali K. (White Lake, MI), Demirovic; Besim (Troy, MI), Gupta; Pinaki (Wixom, MI), Kaminsky; Lawrence A. (White Lake, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 223,052
August 31, 2011
GOVERNMENT CONTRACT RIGHTS This invention was made with U.S. Government support under Agreement No. DE-FC26-08NT04386, awarded by the U.S. Department of Energy The U.S. Government may have certain rights in this invention.