Patent ID: 7066160
Filing Date: 2006-06-27
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A failure diagnosis system for an exhaust gas recirculation device provided in an internal combustion engine for recirculating a part of an exhaust gas into an intake pipe of the internal combustion engine via a recirculation valve, comprising: a detection unit that detects a condition of air flowing through the intake pipe of the internal combustion engine; a control unit that interrupts a control executed by a variable intake air flow rate device that varies a flow rate of intake air introduced into a combustion chamber of the internal combustion engine; and a diagnosis unit that diagnoses a failure in the exhaust gas recirculation device, wherein the control unit sets a variable valve timing mechanism to the most retarded position before the detection unit detects the condition flowing through the intake pipe, and the diagnosis of the diagnosis unit is based on the detected condition of air.