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Method and apparatus for executing an asynchronous clutch-to-clutch shift in a hybrid transmission

United States Patent

August 12, 2014
View the Complete Patent at the US Patent & Trademark Office
A hybrid transmission includes first and second electric machines. A method for operating the hybrid transmission in response to a command to execute a shift from an initial continuously variable mode to a target continuously variable mode includes increasing torque of an oncoming clutch associated with operating in the target continuously variable mode and correspondingly decreasing a torque of an off-going clutch associated with operating in the initial continuously variable mode. Upon deactivation of the off-going clutch, torque outputs of the first and second electric machines and the torque of the oncoming clutch are controlled to synchronize the oncoming clutch. Upon synchronization of the oncoming clutch, the torque for the oncoming clutch is increased and the transmission is operated in the target continuously variable mode.
Demirovic; Besim (Troy, MI), Gupta; Pinaki (Wixom, MI), Kaminsky; Lawrence A. (White Lake, MI), Naqvi; Ali K. (White Lake, MI), Heap; Anthony H. (Ann Arbor, MI), Sah; Jy-Jen F. (West Bloomfield, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 398,993
February 17, 2012
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.