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Method and apparatus for executing a shift in a hybrid transmission

United States Patent

September 3, 2013
View the Complete Patent at the US Patent & Trademark Office
A method for executing a transmission shift in a hybrid transmission including first and second electric machines includes executing a shift-through-neutral sequence from an initial transmission state to a target transmission state including executing an intermediate shift to neutral. Upon detecting a change in an output torque request while executing the shift-through-neutral sequence, possible recovery shift paths are identified. Available ones of the possible recovery shift paths are identified and a shift cost for each said available recovery shift path is evaluated. The available recovery shift path having a minimum shift cost is selected as a preferred recovery shift path and is executed to achieve a non-neutral transmission state.
Gupta; Pinaki (Wixom, MI), Kaminsky; Lawrence A. (White Lake, MI), Demirovic; Besim (Troy, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 402,946
February 23, 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.