Patent ID: 7096861
Filing Date: 2006-08-29
Classification: F02D,F02M,Y02T

Abstract:
1. A control system for an internal combustion engine provided with an exhaust gas recirculation device including an exhaust gas recirculation passage for recirculating exhaust gases from the engine to an intake system of the engine, and an exhaust gas recirculation control valve provided in said exhaust gas recirculation passage, for controlling the flow rate of the exhaust gases, said control system comprising: an air-fuel ratio sensor provided in the exhaust system of the engine; air-fuel ratio control means for implementing feedback control of the air-fuel ratio of an air-fuel mixture supplied to the engine based on the output of said air-fuel ratio sensor; and failure determining means for determining a failure of said exhaust gas recirculation device based on a changing component of the air-fuel ratio control amount calculated by the air-fuel ratio control means when changing the opening of said exhaust gas recirculation control valve in a predetermined cycle.