| 摘要 |
A control device and control method for an internal combustion engine capable of using a gasoline and alcohol blend as fuel. The control device includes: an air-fuel ratio correction device that performs an air-fuel ratio feedback correction process calculating an air-fuel ratio feedback correction amount for compensating for a divergence between a target value and an actually measured value of an air-fuel ratio of the engine; an air-fuel ratio learning device that performs an air-fuel ratio learning process calculating an air-fuel ratio learned value for converging the calculated air-fuel ratio feedback correction amount into a predetermined range from a predetermined correction reference amount; and an alcohol determination device that makes an alcohol determination that a concentration of the alcohol blended is greater than a predetermined concentration if a deviation of the calculated air-fuel ratio learned value being greater than a predetermined threshold value continues longer than a predetermined period.
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