| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable valve timing device capable of preventing an unintended change of valve timing from occurring when an engine is stopped. SOLUTION: The variable valve timing device changes a valve phase by reducing the operating amount of an actuator with a reduction ratio different depending on a phase area. When a valve phase is out of the range of a large reduction ratio 2500 in which the ratio of the changed amount of phase to the operating amount of the actuator is small when the engine is stopped, the actuator is operated by the reaction force of a camshaft, and an unintended phase change may occur. When an engine stop instruction may be given while the engine is operating during the starting of the engine and the stoppage of a vehicle, a target phase position is limited to the area on the retard angle side of the phase limit value IVlmt set in consideration of the valve timing amount changeable between the occurrence of the engine stop instruction and the engine stop. COPYRIGHT: (C)2008,JPO&INPIT
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