SYSTEM AND METHOD FOR DIAGNOSIS OF RUSS ASSEMBLY ON AN EXHAUST GAS RECYCLING VALVE

摘要

Methods and systems are provided for determining changes in a flow area of an exhaust gas recirculation (EGR) valve for EGR flow estimates due to soot accumulation on the EGR valve. In one example, a method includes displaying soot accumulation at the EGR valve based on a difference in EGR flow estimated with an intake oxygen sensor and a pressure sensor coupled via the EGR valve. The determination of the difference in EGR flow estimates may occur when the engine is not boosted.