| 摘要 |
An apparatus for detecting abnormalities in a valve timing control apparatus comprises a variable valve timing control mechanism that controls a valve timing of an internal combustion engine through a controlled supply of oil via an oil control valve, means for detecting deviation between a target valve timing and an actual valve timing, means for detecting an amount of change of the actual valve timing, means for force-driving the oil control valve and means for judging that an abnormality has occurred in the valve timing control apparatus based on detection, after the oil control valve has been force driven, of an abnormal deviation between the target valve timing and the actual valve timing and an abnormal amount of change of the actual valve timing.
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