| 摘要 |
PROBLEM TO BE SOLVED: To control an engine by using alcohol concentration of fuel injected from a fuel injection valve even in a period when an alcohol concentration detection value of the fuel detected by an alcohol concentration sensor is different from the alcohol concentration of the fuel injected from the fuel injection valve.SOLUTION: In this control device, the alcohol concentration detection value is different from the alcohol concentration of the fuel injected from the fuel injection valve 21 for a while after the alcohol concentration detection value of the alcohol concentration sensor 37 is varied after fuel supply, but an air-fuel ratio F/B (feedback) correction amount is varied in accordance with the variation when the alcohol concentration of the fuel injected from the fuel injection valve 21 is varied after the alcohol concentration detection value is varied, and alcohol concentration for control (alcohol concentration of the fuel injected from the fuel injection valve 21) is updated in accordance with the presence or the absence of the variation in the alcohol concentration detection value and the air-fuel ratio F/B correction amount, and thus, the alcohol concentration for control can be accurately calculated. |
