A method for heating a catalyst includes maintaining engine speed at a high rpm when the engine is started. The high rpm is maintained even if the driver shifts the transmission out of neutral. Engine speed is lowered when there is an indication that the driver wishes to drive off, such as the driver releasing the brake pedal. Maintaining the high rpm during the time between shifting the transmission out of neutral and providing an indication that drive off is desired contributes to additional catalyst warm up. The high rpm may be disabled if the catalyst temperature is sufficiently high or if the vehicle is parked on a slope, for example.
IMPROVEMENTS IN CONTROLLING INTERNAL COMBUSTION ENGINE EMISSIONS
VERBESSERTE KONTROLLE DER EMISSIONEN BEI EINER BRENNKRAFTMASCHINE
PERFECTIONNEMENTS APPORTÉS À LA LUTTE CONTRE LES ÉMISSIONS D'UN MOTEUR À COMBUSTION INTERNE
2018-03-28
Patent
Electronic Resource
English
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