Diagnostisches Verfahren zur Feststellung von Fehlern in einem Luftzufuhrsystem für Verbrennungskraftmaschinen

摘要

Method for diagnosis of the faults in units of an internal combustion engine (1) air supply system, comprising a flow meter (11), which provides a measured flow rate signal (QAM) which is correlated to a flow rate of fresh air admitted by the engine, and a valve (24) for recirculation of the exhaust gases, to supply the engine in a controlled manner with a fraction of the exhaust gases. The method consists of carrying out first checks (100-120), in conditions which are independent from the operative state of the valve (24), in order to verify a first level of efficiency of the flow meter (11); if the first level of efficiency of the said flow meter (11) is verified, carrying out second checks (130-140), in conditions which are compatible with the first level of efficiency of the flow meter (11), in order to verify a first level of efficiency of the valve (24).