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Method and apparatus for effecting light-off of a catalytic converter in a hybrid powertrain system

United States Patent

8,475,333
July 2, 2013
View the Complete Patent at the US Patent & Trademark Office
A powertrain system includes a hybrid transmission and an internal combustion engine coupled to an exhaust aftertreatment device. A method for operating the powertrain system includes operating the hybrid transmission to generate tractive torque responsive to an operator torque request with the internal combustion engine in an engine-off state so long as the tractive torque is less than a threshold. The internal combustion engine is operated in an engine-on state at preferred operating conditions to effect light-off of the exhaust aftertreatment device and the hybrid transmission is coincidentally operated to generate tractive torque responsive to the operator torque request when the operator torque request exceeds the threshold. The internal combustion engine is then operated in the engine-on state to generate tractive torque responsive to the operator torque request.
Roos; Bryan Nathaniel (West Bloomfield, MI), Spohn; Brian L. (Holly, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 101,341
20120283067
May 5, 2011
GOVERNMENT CONTRACT RIGHTS The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Project Number DE-FC26-08NT04386 awarded by the U.S. Department of Energy.