| 摘要 |
A controller 21 controls an intake air flow rate via an electronic throttle 14 based on a feedback correction amount set so that a rotation speed (NE) of an internal combustion engine ( 11 ) during idle running gradually approaches a target value (tNE). When the deviation (DeltaNE) between the rotation speed (NE) and the target value (tNE) becomes equal to or greater than a predetermined value (XNE), increase correction of the intake air flow rate is performed according to the deviation (DeltaNE). When the deviation (DeltaNE) falls below the predetermined value (XNE), a value corresponding to the increase correction amount at that time is added to the feedback correction amount, and subsequent increase correction amounts are set to zero, so the decreased engine rotation speed (NE) can be returned to the target value (tNE) with a rapid response, and future drops of the returned engine rotation speed (NE) are prevented.
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