Diagnoseeinrichtung zum Überwachen eines Abgasrückführsystems einer Brennkraftmaschine

摘要

This invention concerns a diagnostic device for monitoring an exhaust gas return system which has elements for determining a diagnostic value (EGR_VER, EGR_DIF) of the exhaust gas return system without influencing the operation of the internal combustion engine. The diagnostic value (EGR_VER, EGR_DIF) depends upon the suction pipe pressure (MAP_MES) and upon a suction pipe pressure (MAP_MDL, MAP_EGR_MDL) determined by a monitoring device (25) from at least one of the additional operating parameters of the internal combustion machine. The diagnostic device has elements as well for recognizing the exhaust gas return system as defective, if the diagnostic value (EGR_VER, EGR_DIF) lies outside of range dependent upon at least an operating parameter.