Method and apparatus of ignition timing control.

摘要

An ignition timing control method compensates for the variations in characteristic among different knock sensors and for the aging of a knock sensor (7) of an engine (1) by detecting the output of the knock sensor (7) under an engine operating condition which is less conductive to knocking phenomenon, e.g., the idling operation, comparing the detected sensor output with a plurality of preliminarily stored reference values (Vsp) to detect and store the sensitivity of the sensor (7), computing an amount of retard in accordance with a knock intensity detected under a knock control condition and the stored sensor sensitivity, obtaining a correction amount in accordance with the retard amount, and correcting a basic ignition timing in accordance with the correction amount thereby determining a final ignition timing, and an apparatus carrying out the method.