| 摘要 |
An ignition timing control apparatus for an internal combustion engine is disclosed whereby ignition timing is set without incurring deviations from the desired ignition timing even under transient engine operating conditions. For each intake stroke of each cylinder of the engine, the apparatus determines a representative intake air amount value and a representative engine speed value for the intake valve open period of the cylinder, and, based on these values, sets the ignition timing for the combustion stroke associated with the intake stroke. The representative values are the average values of the intake air amounts and engine speeds at the intake valve opening and closing times, or the values of the intake air amount and engine speed obtained at an intermediate point through the intake valve open period. The intake air amount and engine speed at the intake valve closing time and the intake air amount and engine speed at the intermediate point of the intake valve open period may be obtained as values predicted on the basis of the values of the previously detected intake air amount and engine speed so that controllability can be preserved.
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