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

Patent · 12 August 2014

OSTI ID:1150211

Demirovic, Besim; Gupta, Pinaki; Kaminsky, Lawrence A.; Naqvi, Ali K.; Heap, Anthony H.; Sah, Jy-Jen F.

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.

• Research Organization: NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-08NT04386
• Assignee: GM Global Technology Operations LLC (Detroit, MI)
• Patent Number(s): 8,801,567
• Application Number: 13/398,993
• OSTI ID: 1150211
• Country of Publication: United States
• Language: English

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