Patent ID: 7143730

Claim:
A system for controlling a valve timing for an internal combustion engine, comprising: a driving rotator which is rotated by a crankshaft of the engine; a driven rotator which follows the driving rotator, the driven rotator causing rotation transmitted to a camshaft; a phase alteration mechanism interposed between the driving rotator and the driven rotator, the phase alteration mechanism comprising a movable portion, the movable portion traveling between a beginning end and a termination end to cause relative rotation between the driving rotator and the driven rotator, the phase alteration mechanism having a direction turning point at which a phase alteration direction is reversed when the movable portion travels from the beginning end to the termination end; and an operation control device which displaces the movable portion of the phase alteration mechanism when undergoing an energization control, the movable portion being displaced toward the beginning end when the energization control fails to be carried out, wherein a rotation phase of the driven rotator with respect to the driving rotator is configured to be set at a middle position between a maximum retard position and a maximum advance position when the movable portion is displaced maximally to be located at the beginning end.