Patent ID: 7441401

Claim:
A control apparatus for an internal combustion engine, comprising: intake air amount control means for controlling an intake air amount of the internal combustion engine; ignition timing control means for controlling an ignition timing of the internal combustion engine; catalyst heat-up control means for increasing the intake air amount after cold start of the internal combustion engine and performing control for retarding the ignition timing; air-fuel ratio detecting means for detecting an air-fuel ratio of exhaust gas in the internal combustion engine; and fuel property determining means for making a determination on fuel property through a comparison between a parameter value calculated from the air-fuel ratio and a preset reference value when the catalyst heat-up control means performs the control for retarding the ignition timing, further comprising: fuel property storing means for storing a result of a determination made by the fuel property determining means: and fuel injection amount changeover means for making a changeover in a fuel injection amount based on the result of the determination, wherein the fuel injection amount changeover means increases the fuel injection amount when the result of the determination made by the fuel property determining means indicates low volatile fuel, in comparison with a fuel injection amount at a time when the result of the determination made by the fuel property determining means indicates standard fuel.