| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology that controls the ignition timing by approving fluctuation of engine rotational speed and correcting deviation of an ignition point caused by the fluctuation of the rotational speed. SOLUTION: The engine rotational speed is calculated from a pulse signal of an ignition cycle and a pulse signal of a reference cycle based on an output pulse of a crank angle sensor of an engine. An engine rotational speed correction valueΔNe(-1) is calculated from an engine rotational speed Ne(-1) calculated from a reference cycle of a previous combustion cycle and an engine rotational speed Neig(-1) calculated from an ignition cycle of the previous combustion cycle.ΔNe(-1) is added to an engine rotational speed Ne(0) calculated from a reference cycle of the present combustion cycle, and an estimated engine rotational speed Neig(0) of an ignition point of the present combustion cycle is calculated. The ignition point of the present combustion cycle is corrected based on Neig(0), and the ignition timing is controlled. COPYRIGHT: (C)2009,JPO&INPIT
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