| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control system for easily grasping the cause when causing abnormality of engine speed control such as reducing output of an engine and performing control for properly reducing a deviation between a moving average engine speed increasing with the lapse of time and a target engine speed and a deviation between an actual engine speed and the target engine speed. SOLUTION: An ECU 10 (an electronic control device) calculates the deviation on the basis of the actual engine speed of the engine 50 acquired from an engine speed sensor 44 and the target engine speed, and also calculates an engine speed deviation integral value being a moving average value of the calculated deviation. Then, the ECU 10 determines whether or not the calculated engine speed deviation integral value is a threshold value or less predetermined in the ECU 10. COPYRIGHT: (C)2005,JPO&NCIPI
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