Patent ID: 8190349

Claim:
A control device of an internal combustion engine comprising: an air-fuel ratio modulator, compulsorily performing modulation of an air-fuel ratio of an exhaust which flows in a three-way catalyst provided in an exhaust system of the internal combustion engine to activate the three-way catalyst; a fluctuation detector, detecting a fluctuation of the internal combustion engine due to the modulation of the air-fuel ratio performed by the air-fuel ratio modulator; a feed-back controller, performing feed-back control of a driving control parameter of the internal combustion engine so as to suppress the fluctuation detected by the fluctuation detector; a determiner, determining whether or not a driving state of the internal combustion engine is in an operating area of the feed-back controller; and an operator, setting a target revolution of the internal combustion engine, which is a target value for suppressing the fluctuation of the internal combustion engine, to operate the feed-back controller based on the target value, when the determiner determines that the driving state of the internal combustion engine is not in the operating area of the feed-back controller, while the air-fuel modulator performs the modulation of the air-fuel ratio.