| 摘要 |
PROBLEM TO BE SOLVED: To more favourably carry out lift quantity holding control through a valve lift quantity variable mechanism constituted by having a three- dimensional cam. SOLUTION: Valve lift quantity in a driving state of an engine 11 is computed as a target value VLA by an electronic control unit(ECU) 130. A valve characteristic of a suction valve 20 is detected as a detected value VLR by detecting displacement quantity of a camshaft 22. A controlled variable of valve lift quantity variable mechanisms 22a, 36 is computed as a driving duty ratio DVL in accordance with a detected value VLA and a target value VLR by an ECU 130, and valve lift quantity variable mechanisms 22a, 36 are controlled by the driving duty ratio DVL. Even when variation of the detected value VLR becomes zero, in the case when a difference exists between the detected value VLR and the target value VLA, the driving duty ratio DVL at the time is learned and renewed as a holding command value KVL.
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