Japanese Patent JPH0315036

B2

Engine operating parameters are detected to see whether the engine is in idle state or not. Then the speed of the engine is detected to determine whether engine speed is varying or not. To this end, a plurality of engine speed data are averaged to find an average engine speed which will be used as a reference value for the comparison with respect to a latest instantaneous engine speed. Ignition timing is either retarded or advanced for maintaining the engine speed at a desired value in such a manner that the amount of correction of the ignition timing is determined by deriving data from a memory in which relationship between the engine speed variation and ignition timing correction amount is stored in the form of a map. In the case that the average engine speed is far deviated from a setting engine speed, the average value is not used as the reference value, but rather the setting speed is used to find the difference. In the case that no setting engine speed is provided, the average engine speed is always used as the reference value. In addition to ignition timing control, the airflow bypassing the throttle valve may be controlled so that idle engine speed does not fluctuate.

MURAKAMI KAZUHIRO
YAMAZOE HISAMITSU
MIZUNO TOSHIAKI

JP1389882A

February 28, 1991

January 29, 1982

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NIPPON DENSO CO

F02D31/00; F02D41/14; F02D41/16; F02D43/00; F02P5/15; F02P5/155

Next Patent: JPH0315037