Patent ID: 6830027
Filing Date: 2004-12-14
Classification: F02D

Abstract:
A control system for an internal combustion engine having a plurality of cylinders and switching means for switching between an all-cylinder operation in which all of said cylinders is operated and a partial-cylinder operation in which at least one of said plurality of cylinders is halted, said control system comprising:operating parameter detecting means for detecting operating parameters of a vehicle driven by said engine, said operating parameters including at least one operating parameter of said engine; instructing means for instructing said switching means to perform the all-cylinder operation or the partial-cylinder operation according to the operating parameters; an oxygen concentration sensor provided in an exhaust system corresponding to said at least one cylinder which is halted during the partial-cylinder operation, for detecting an oxygen concentration in exhaust gases; diagnosing means for diagnosing a failure of said oxygen concentration sensor in a predetermined operating condition including a fuel-cut operation of said engine upon deceleration, in which fuel supply to said engine is stopped; and permitting means for permitting the partial-cylinder operation after completion of the failure diagnosis by said diagnosing means.