| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable valve timing device capable of stopping a spool of a control valve at a holding position even in a case where oil viscosity is high or the like. SOLUTION: This variable valve timing device is provided with: an OCV 10 controlling supply and discharge of hydraulic oil to/from a hydraulic actuator 20 by the position of a spool 12 in a sleeve 18; and a control device 40 controlling the operation of the hydraulic actuator 20 by outputting OCV drive duty based on deviation of a target displacement angle from a control displacement angle to the OCV 10. The control device 40 outputs the OCV drive duty based on the deviation of the target displacement angle from the control displacement angle to the OCV 10 when the spool 12 is moved from a working position to the holding position, and outputs OCV drive duty of polarity reverse to that of the OCV drive duty for restoring the spool 12 to the holding position. COPYRIGHT: (C)2009,JPO&INPIT
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