| 摘要 |
A variable valve timing system includes a hydraulic pressure circuit for controlling an operation fluid supply/discharge of the relative rotation controlling mechanism and for controlling an operation fluid supply/discharge of each of the advanced angle chamber and the retarded angle chamber. The hydraulic pressure circuit, upon initiation of the internal combustion engine, discharges the operation fluid from the relative rotation controlling mechanism and the advanced and retarded angle chambers until a pressure of the operation fluid reaches a controllable pressure value. The hydraulic pressure circuit, after the pressure of the operation fluid reaches the controllable pressure value, effecting filling of one of the advanced and retarded angle chambers which is at the superior side of in phase transfer response with operation fluid, subsequently effecting filling of the other of the advanced and retarded angle chambers, and being adapted to supply the operation fluid to the relative rotation controlling mechanism.
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