| 摘要 |
An ignition controlling system has a first memory storing a plurality of upper limit ignition timings and lower limit ignition timings each of which is a maximum advance timing for high-octane gasoline and low-octane gasoline without causing knocking, and storing a plurality of maximum advance ignition timings. A second memory stores a coefficient for determining a dividing point between said upper and lower limit ignition timings. The coefficient is rewritten in accordance with occurrence of the knocking of the engine. A learning ignition timing is calculated from the upper and lower limit ignition timings and the coefficient derived from the first and second memory.
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