Patent ID: 8594905

Claim:
A control system for an internal combustion engine, comprising: target intake air amount calculating means for calculating a target intake air amount according to a target output torque of said engine; intake air amount control means for controlling an intake air amount of said engine according to the target intake air amount; and ignition timing control means for controlling an ignition timing of said engine; wherein said target intake air amount calculating means repeatedly executes the following steps 1) to 3) until a convergence time at which a difference between an estimated output torque and the target output torque becomes equal to or less than a predetermined threshold value, after setting an initial value of a temporary target intake air amount, and sets the target intake air amount to the temporary target intake air amount at the convergence time: 1) calculating an estimated retard correction amount which is a retard correction amount of the ignition timing when supplying the temporary target intake air amount of air to said engine; 2) calculating the estimated output torque of said engine according to the temporary target intake air amount and the estimated retard correction amount; and 3) modifying the temporary target intake air amount so that the estimated output torque approaches the target output torque.