Controlled engine shutdown for a hybrid electric vehicle

Details Controlled engine shutdown for a hybrid electric vehicle Controlled engine shutdown for a hybrid electric vehicle

F - Mech Eng,Light,Heat,Weapons

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F02D 28/00 (2006.01) F02D 17/04 (2006.01) F02D 37/02 (2006.01) F02D 41/00 (2006.01) F02D 41/04 (2006.01) F02D 35/00 (2006.01) F02D 41/12 (2006.01) F02M 25/07 (2006.01) F02M 25/08 (2006.01) B60K 6/02 (2006.01) B60K 6/04 (2006.01)

Patent

CA 2384542

This invention is a method and system to control engine shutdown in a hybrid electric vehicle (HEV). The invention allows for reduced tailpipe emissions during the many engine shutdowns and subsequent restarts during the course of an HEV drive cycle and reduced evaporative emissions, during an HEV "soak" (inactive) period. The engine shutdown routine can ramp off fuel injectors, control engine torque (via electronic throttle control), control engine speed, stop spark delivery by disabling the ignition system, stop purge vapor flow by closing a vapor management valve (VMV), stop exhaust gas recirculation (EGR) flow by closing an EGR valve, and flush the intake manifold of residual fuel (vapor and puddles) into the combustion chamber to be combusted. The resulting exhaust gas byproducts are then converted in the catalytic converter.

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