Valve timing control apparatus and method for internal combustion engine
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United States of America Patent
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-
Nov 12, 2002
Grant Date -
Feb 7, 2002
app pub date -
Jul 11, 2001
filing date -
Jul 31, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
During a course of stopping an engine, the oil pressure in a timing advance-side hydraulic chamber and the oil pressure in a timing retard-side hydraulic chamber of a variable valve timing mechanism are adjusted so that the relative rotation phase of an intake camshaft changes to the timing advanced side of a phase (predetermined advanced state) corresponding to the engine start-up timing. After the relative rotation phase has changed to the advanced side of the predetermined advanced state, the duty ratio D, that is, a control quantity used to adjust the oil pressure, is fixed to a value that holds the relative rotation phase.
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