| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a valve timing control device that accurately controls valve timing while preventing rapid changes in the operation state of an internal combustion engine. <P>SOLUTION: When the temperature of a working oil exceeds a predetermined temperature st, and the engine operation conditions for shifting an engine to a high rotation state equal to or higher than a predetermined rotation speed N after the engine continuously has a low rotation state lower than the predetermined rotation speed N for a predetermined period CT or more, are satisfied (Yes in S101, S102, S103), the flow of the working oil relative to each operation chambers 22, 23, 24, 26, 27, 28 is controlled so that the rotational phase of a vane rotor 14 is compulsorily changed between an advance phase and a retard phase with respect to a housing 12 alternately (S104). <P>COPYRIGHT: (C)2012,JPO&INPIT |
