| 摘要 |
There is provided a valve timing control system for an internal combustion engine, which is capable of enhancing the accuracy of valve timing control. The valve timing control system 1 for the internal combustion engine 3 changes the cam phase of an intake cam 6a relative to a crankshaft 9, to thereby control the valve timing of an intake valve 4. The valve timing control system 1 fixes a desired cam phase CAINCMD at a value CAINCMDFC during an fuel cut-off, and controls a cam phase change mechanism 8 such that from a time t2 during the fuel cut-off, the cam phase is held at a value assumed at the time t2. Further, the valve timing control system 1 calculates a learned value DCALEARN of the amount of deviation of an actual cam phase CAIN based on a plurality of values of the actual cam phase CAIN detected at and after the time t2, and the constant value CAINCMDFC of the desired cam phase CAINCMD (step S5).
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