Patent ID: 7406933

Claim:
A variable valve timing apparatus changing an opening/closing timing of at least any one of an intake valve and an exhaust valve provided to an engine, comprising: an actuator, a change mechanism changing said opening/closing timing by changing difference in rotational phase of a camshaft driving the valve having said opening/closing timing changed, from a rotational phase of a crankshaft, at an amount of change according to an operation amount of said actuator; and an actuator operation amount setting portion setting the operation amount of said actuator, based on a deviation between said opening/closing timing at present of the valve having said opening/closing timing changed and a target value thereof, said actuator operation amount setting portion including convergence determination means for setting the operation amount of said actuator to approximately zero, when an absolute value of said deviation is equal to or smaller than a determination value, and determination value switching means for setting, in changing said opening/closing timing during a course of engine stop, said determination value in said convergence determination means at a value larger than said determination value in changing said opening/closing timing at a time of engine operation.