| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine ignition timing control device capable of effectively suppressing rotation fluctuation by enabling high response ignition timing feed back control. SOLUTION: The ignition timing control device re-calculates an ignition timing feed back control correction quantityθfb and final ignition timing (S112) when it is determined that re-calculation process is executable during a period from the timing of the regular calculation of the final ignition timing until the final ignition timing (yes in S108, yes in S110). Since engine speed NE at timing closer to actual ignition timing is reflected to the final ignition timing, overshoot does not easily occurs even if a feed back gain is increased, high response ignition timing feed back control is enabled and engine speed fluctuation can be effectively suppressed. When re-calculation process is not executed (no in S108, no in S110), accuracy at the final ignition timing is maintained to some extent and abnormal ignition such as a misfire does not occur since the final ignition timing based on the ignition timing feed back control correction quantityθfb calculated at a regular time is used (S102-S106). COPYRIGHT: (C)2009,JPO&INPIT
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