| 摘要 |
PURPOSE:To prevent frequent changes which are made between the first target of a mixture ratio and the second target of a richer mixture ratio according to the variation in operational state of an engine without degrading the acceleration performance by reducing a delay in the changing period at the high loading time with respect to the low loading time. CONSTITUTION:A controller 18 receives the data detected by an air flow meter 9, a water temperature sensor 15, a crank angle sensor 16, an O2 sensor 40 and the like, calculates a reference fuel injection amount on the basis of the intake amount and the revolution number and sets a compensative coefficient for the high load run according to the reference fuel injection amount and the revolution number. At the high load time when the reference fuel injection amount is higher than the specified value, the compensative coefficient depending on the reference fuel injection amount and the revolution number is changed with a shorter delay. At the low load time the compensative coefficient is changed with a delay longer than that at the time of high load.
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