Ignition timing control system for internal combustion engine

Abstract

A system for controlling an ignition timing of an internal combustion engine, in which an ignition timing advancing correction amount is determined based on at least the detected engine coolant temperature, and it is determined whether the engine is under a predetermined cold starting condition. When the result is affirmative, the ignition timing is advanced beyond the MBT. This arrangement is based on the inventors finding that the gas temperature rises at the combustion stroke, but drops little after the expansion stroke. With this, the increased fuel amount for compensating the engine output loss caused by ignition timing advancement can effectively be utilized to heat the engine coolant, thereby facilitating and improving the engine warm-up.

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