| 摘要 |
PURPOSE:To prevent overleanness from occurring, by selection a feedforward correction factor at the load variation initial stage and also a feedback correction factor afterward, respectively, while compensating it to the rich side when a speed variation is large, in case of a device performing control over a lean side air-fuel ratio. CONSTITUTION:A feedback correction factor setting device G sets a feedback correction factor on the basis of each output out of an air-fuel ratio detecting device A and a desired lean air-fuel ratio setting device B and a feed forward correction factor setting device sets a feedforward correction factor so as to become the set desired lean air-fuel ratio. When a load variation judging device E has judged that a load variation is more than the specified one on the basis of variations in a fundamental fuel injection quantity, a first selector device H selects the feedforward correction factor as long as the specified time, and afterward it selects the feedback correction factor. When a speed variation detecting device L detects a speed variation of more than the specified one, each correction factor or the desired lean air-fuel ratio is compensated and the promotion of richness is carried out.
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