Patent ID: 7440836

Claim:
A control system for an internal combustion engine, which controls an amount of intake air drawn into a cylinder of the engine by a variable intake mechanism and controls an amount of fuel to be supplied to a combustion chamber, to thereby control an air-fuel ratio of a mixture in the combustion chamber, comprising: operating condition parameter-detecting means for detecting an operating condition parameter indicative of an operating condition of the variable intake mechanism; air-fuel ratio parameter-detecting means for detecting an air-fuel ratio parameter indicative of an air-fuel ratio of exhaust gases flowing through an exhaust passage of the engine; target air-fuel ratio-calculating means for calculating a target air-fuel ratio to which the air-fuel ratio of the mixture is to be controlled; air-fuel ratio control parameter-calculating means for calculating an air-fuel ratio control parameter for controlling an air-fuel ratio of the mixture such that the air-fuel ratio becomes equal to the target air-fuel ratio, according to the air-fuel ratio parameter; correction means for correcting the operating condition parameter according to one of the air-fuel ratio control parameter and the air-fuel ratio parameter; and fuel amount-determining means for determining the amount of fuel according to the corrected operating condition parameter and the air-fuel ratio control parameter.