Valve timing control apparatus for internal combustion engine

A valve timing control apparatus for controlling an opening and closing timing of a valve of an internal combustion engine comprising:

• a driving side rotational member synchronously rotated with a crankshaft;
• a driven side rotational member provided coaxially with the driving side rotational member and synchronously rotated with a camshaft;
• a fluid pressure chamber formed on at least one of the driving side rotational member and the driven side rotational member, the fluid pressure chamber being separated into an advanced angle chamber and a retarded angle chamber;
• a phase control apparatus controlling supply and discharge of an operation fluid relative to one of, or both of the advanced angle chamber and the retarded angle chamber, for displacing a relative rotational phase between the driving side rotational member and the driven side rotational member;
• a locking mechanism having a movable member movable in a radial direction of the driving side rotational member and the driven side rotational member, the locking mechanism being at a lock state for restraining a displacement of the relative rotational phase when the movable member moves inwardly in the radial direction, and the locking mechanism being at an unlock state for allowing the displacement of the relative rotational phase when the movable member moves outwardly in the radial direction;
• a judging means for judging a supply condition of the operation fluid relative to the fluid pressure chamber;
• and
• a control means for controlling, after the internal combustion engine is started, a rotational speed of the crankshaft less than or equal to a predetermined rotational speed, until the judging means judges that the operation fluid is supplied into the fluid pressure chamber.