| 摘要 |
Idling speed of the internal combustion engine is controlled to a predetermined engine speed by correcting an engine operating parameter, such as, an ignition timing, the quantity of fuel injection, etc., to suppress a variation rate of the engine torque. Instead of detecting the torque variation rate directly, an engine speed variation rate is detected, and a correction value of the engine parameter is determined as a function of the engine speed variation rate based on the finding that the torque variation rate can be approximated as the engine speed variation rate with a fixed phase difference therebetween. Since the phase difference is determined by the engine speed, a correction value at the present moment is obtained from the previously obtained correction value which is preceding by the phase difference.
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