| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine capable of correcting a control value of air-fuel ratio control according to the degree of degradation of a combustion state of the internal combustion engine. SOLUTION: An engine ECU calculates rotation fluctuation rate based on ratio of rotation required time in a case of occurrence of complete misfire in a cylinder, rotation required time in a case of occurrence of complete combustion, and rotation required time in a present combustion stroke (step S11) and accumulates the calculated rotation fluctuation rate (step S12). The engine ECU calculates learning value slippage quantity from the accumulated rotation fluctuation rate (step S14) if it is judged that number of accumulation of rotation fluctuation rate reaches 1,000 times (Yes in step S13), and corrects learning value of feedback control to air-fuel ratio (step S16) if the learning value slippage quantity is not less than a fixed value (Yes in step S15). COPYRIGHT: (C)2010,JPO&INPIT
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