Patent ID: 8649957

Claim:
A control device for an internal combustion engine, comprising: requirement acquiring means that acquires a required torque and a required air-fuel ratio of the internal combustion engine; target air-fuel ratio generating means that generates a target air-fuel ratio by lessening a change speed of the required air-fuel ratio; target air quantity calculating means that calculates a target air quantity for realizing the required torque under the target air-fuel ratio, based on data in which a relationship of torque generated by the internal combustion engine and an air quantity which is taken into a cylinder is fixed by being related to an air-fuel ratio; air quantity control means that manipulates an actuator for air quantity control in accordance with the target air quantity; fuel injection quantity control means that manipulates an actuator for fuel injection quantity control in accordance with the target air-fuel ratio; and determination means that acquires information relating to a deterioration degree of a catalyst which is disposed in an exhaust passage of the internal combustion engine, and determines the deterioration degree of the catalyst based on the acquired information, wherein the target air-fuel ratio generating means stops lessening of the change speed of the required air-fuel ratio, or decreases a lessening degree of the change speed of the required air-fuel ratio, when the deterioration degree of the catalyst is a predetermined reference or more.