Valve timing adjusting system
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jun 5, 2014
app pub date -
Jul 5, 2012
filing date -
Jul 12, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A valve timing adjusting system includes a displacement mechanism unit that displaces a camshaft rotational phase 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 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/advance position, and then supplying oil pressure to the locking mechanism unit for moving the rotational phase toward the other of the retard/advance position; the rotational phase stands by at a predetermined position of the one of the retard/advance position past the intermediate locked phase during the lock release process, until a standby time has elapsed.
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