Patent ID: 8322472
Filing Date: 2012-12-04
Classification: B01D,B60L,B60W,F01N,F02D,Y02A,Y02T

Abstract:
1. A method comprising: operating a hybrid vehicle in a first mode during which a combustion engine is off and an electric motor propels the hybrid vehicle; energizing an electrically heated selective catalytic reduction catalyst (EHSCR) during the first mode; operating the vehicle in a second mode after the first mode during which the engine propels the hybrid vehicle; determining a first operating temperature of a passive selective catalytic reduction catalyst (PSCR) in communication with exhaust gas from the combustion engine and located downstream of the EHSCR; and operating the vehicle in a catalyst combustion mode during the second mode when the first operating temperature is below a first predetermined limit, wherein the catalyst combustion mode includes injecting fuel into exhaust gas from the engine at a location before the PSCR.