Zündzeitpunktsteuersystem, Verfahren und Steuereinheit für interne Brennkraftmaschine

摘要

There is provided an ignition timing control system and method and an engine control unit for an internal combustion engine, which are capable of setting optimum timing for execution of retardation of ignition timing when a vehicle on which the engines is installed is accelerated, thereby effectively reducing longitudinal vibrations of the vehicle, which might be caused by torque fluctuations, and maintaining acceleration performance. An acceleration demand-detecting module detects a demand of acceleration of the engine. A rotational speed-detecting module detects a rotational speed of the engine. A rotational variation amount-calculating module calculates a variation amount of the rotational speed of the engine, based on the detected rotational speed of the engine. A rotational variation amount differential value-calculating module calculates a differential value of the variation amount of the rotational speed of the engine, based on the calculated variation amount of the rotational speed of the engine. A retard amount-calculating module calculates a retard amount for retarding the ignition timing. A retardation execution module executes retardation of the ignition timing by the retard amount, on condition that the demand of the acceleration is detected, that the variation amount of the rotational speed of the engine is larger than a predetermined amount, and that the differential value of the variation amount of the rotational speed of the engine is smaller than a predetermined value.