| 摘要 |
PROBLEM TO BE SOLVED: To inhibit exhaust atmosphere from becoming lean in transition to an operating mode where the number of operating cylinders is decreased. SOLUTION: A control device for an internal combustion engine is provided with a fuel injection valve for directly injecting fuel to a combustion chamber of the internal combustion engine, an ignition device for burning air-fuel mixture containing fuel injected from the fuel injection valve, and a variable cylinder management mechanism capable of changing the number of operating cylinders. The control device includes a cylinder decrease transition means making a transition to an operating mode where the number of operating cylinders is decreased through the variable cylinder management mechanism, a prediction means predicting based on an operating condition of the internal combustion engine that air-fuel ratio of exhaust atmosphere of the internal combustion engine becomes lean due to a stop of the fuel injection into one or more cylinders to be halted by the transition, and an additional fuel control means injecting additional fuel from the fuel injection valve to the one or more cylinders to be halted after ignition performed by the ignition device in a combustion cycle where the prediction is made if the prediction means predicts that the air-fuel ratio of the exhaust atmosphere of the engine becomes lean. COPYRIGHT: (C)2009,JPO&INPIT
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