METHOD FOR INTERNAL COMBUSTION ENGINE WITH EXHAUST RECIRCULATION

摘要

The invention relates to method for maintaining the heat in an exhaust after treatment system (23) connected to the exhaust pipe (22) of an internal combustion engine (10) . The engine is used to propel a vehicle and is equipped with a valve-controlled EGR duct (24) for the adjustable recirculation of exhaust gases from the exhaust side (14) of the engine to its induction side (13) . According to the invention, it is detected that neither the braking system nor the throttle control mechanism (29) of the vehicle is activated and that the vehicle is being driven at a speed in excess of a a predetermined value. After this, the gas flow through the EGR duct (24) is regulated so that the gas flow to the exhaust aftertreatment system (23) is reduced to a level which is less than about 50% of the gas flow to the exhaust aftertreatment system with shut-off EGR valve .