METHOD FOR DETERMINING THE NOx CRUDE EMISSION OF AN INTERNAL COMBUSTION ENGINE OPERATED WITH AN EXCESS OF AIR

摘要

According to the inventive method, an internal combustion engine is operated in the stratified charge operation and a base value for the NOx crude emission is determined which depends on the amount of fuel (MFF) injected into the cylinders of the internal combustion engine and the speed (N) of the internal combustion engine. A correction factor is added to the base value. Said correction factor takes into consideration the exhaust gas recirculation ratio (EGR_RATIO), the temperature of the intake air (TIA) and the position of the throttle device (20) in the stratified charge operation.