| 摘要 |
A variable valve timing mechanism control apparatus which enables a valve timing of an intake valve of an internal combustion engine and a valve timing of an exhaust valve of the internal combustion engine to be varied individually, prohibits a change in the valve timing of the intake valve and changes only the valve timing of the exhaust valve when a valve overlap amount is negative. As a result, the required ignition timing will not change in a complex manner in the region where the valve overlap amount is negative so the ignition timing can be easily optimized even when the valve overlap amount is negative.
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