| 摘要 |
Conventional valve timing control is improved upon so that a locking mechanism unit carries out a lock release operation with certainty. A valve timing adjusting system includes a displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft, a locking mechanism unit that locks the rotational phase, and a control unit that controls operations of a hydraulic control valve. The control unit includes a property obtainment unit that obtains property information regarding hydraulic properties, and a lock release process completes the locking release by supplying oil pressure to the locking mechanism unit for moving the rotational phase from an intermediate locked phase toward one of a retard position and an advance position, and then supplying oil pressure to the locking mechanism unit for moving the rotational phase toward the other of the retard position and the advance position; the rotational phase is caused to stand by at a predetermined position of the one of the retard position and the advance position past the intermediate locked phase during the lock release process, until a standby time has elapsed; and the system further includes a standby time changing unit that changes the standby time based on the property information. |
