To provide an ignition timing control apparatus for an internal combustion engine preventing engine stall and knock in an idling operation state.
This ignition timing control apparatus 1 for an internal combustion engine controlling ignition timing in an idling operation state is provided with a fundamental ignition timing calculating means 2 for calculating fundamental ignition timing IGMAP depending on the operated condition of the internal combustion engine 3, a rotational speed detecting means 2 for detecting rotational speed NE, a target rotational frequency setting means 2 for setting target rotational frequency NOBJ, a final ignition timing calculating means 2 for calculating final ignition timing IGLOG by correcting the fundamental ignition timing IGMAP depending on the deviation DNOBJ between the target rotational frequency NOBJ and the rotational speed NE, a delay side limiting value setting means 2 for setting delay side limiting value IGLGG of the ignition timing depending on atmospheric pressure PA and a limiting means 2 for limiting the final ignition timing IGLOG by the delay side limiting value IGLGG.
MATSUBARA ATSUSHI
NAKAUNE HIROSHI
FUKUCHI HIRONAO
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