Patent ID: 7152574

Claim:
A control apparatus for an internal combustion engine including a first fuel injection mechanism for injecting fuel into a cylinder, and a second fuel injection mechanism for injecting fuel into an intake manifold, operating the fuel injection mechanism based on a fuel injection timing and fuel injection period, and carrying out knock determination based on an output signal from a knock sensor in a knock determination period, said control apparatus comprising: a determination unit for determining whether a noise generated by an operation of said first fuel injection mechanism overlaps with an output signal from said knock sensor in said knock determination period, a modification unit for modifying at least one of the fuel injection timing and fuel injection period of said first fuel injection mechanism so as to avoid an event of the noise generated by an operation of said first fuel injection mechanism overlapping with the output signal of said knock sensor in said knock determination period, based on a determination result from said determination unit, and a control unit for controlling said second fuel injection mechanism so as to compensate for insufficiency when a required fuel injection quantity will be insufficient under a modified fuel injection state.