CONTROLLING INTERNAL COMBUSTION ENGINE EMISSIONS

摘要

The invention relates to a method for heating a catalyst. When the engine is started, engine speed is maintain at high rpm. This high rpm is maintained even if the driver shifts the transmission out of neutral, at time (A). Engine speed is lowered if an indication that the driver wishes to drive off is detected, at time (C), e.g. release of the brake pedal. The shaded area shows the additional contribution to catalyst warm up. The high rpm may be disabled if catalyst temperature is high enough or if the vehicle is parked on a slope. The invention also relates to a vehicle carrying out the method.

主权项

1. A method of initiating treatment of the exhaust stream of an internal combustion engine of a vehicle having wheel brakes and a drive line, the method comprising:
starting the vehicle engine; running the vehicle engine at a first idle speed; detecting movement of a drive line selector from a neutral to a drive condition while vehicle wheel brakes are activated; delaying enablement of said drive line until at least one indication that a driver desires that the vehicle start moving is detected, so as to prolong duration of said first idle speed; and reducing engine speed from the first idle speed to second, lower idle speed for drive line enablement.