Patent ID: 8903633

Claim:
A control system for an internal combustion engine having an intake system for supplying an amount of air to at least one cylinder, at least one fuel injector for injecting fuel into said at least one cylinder, and an exhaust gas recirculation device for recirculating a portion of an exhaust gas to said intake system, said control system comprising: an air flow sensor that detects an intake air amount; a crank angle sensor that detects a rotational speed of said engine; and an electronic control unit (ECU) programmed to: calculate an amount of the exhaust gas recirculated by said exhaust gas recirculation device; calculate an in-cylinder oxygen amount correlated parameter which is correlated with an amount of oxygen existing in the at least one cylinder before fuel injection by said at least one fuel injector based on an oxygen amount contained in the detected intake air amount and an oxygen amount contained in the calculated amount of the recirculated exhaust gas; determine a fuel injection parameter by retrieving a fuel injection parameter map according to the in-cylinder oxygen amount correlated parameter and the engine rotational speed; correct a fuel injection timing, which is contained in the fuel injection parameter, so that a retard amount of the fuel injection timing increases as the in-cylinder oxygen amount correlated parameter correlated with an amount of oxygen existing in the at least one cylinder before fuel injection by said at least one fuel injector increases; and control said at least one fuel injector based on the corrected fuel injection parameter.