Patent ID: 7011060

Claim:
A valve timing control apparatus for an internal combustion engine comprising: a variable valve timing mechanism which varies an opening-and-closing timing of an intake valve or an exhaust valve due to a rotational phase of a camshaft with respect to a crankshaft of an engine being varied; a crank angle sensor which detects a reference rotational position of said crankshaft; a cam sensor which detects a reference rotational position of said camshaft; a first rotational phase detecting unit which detects said rotational phase at each rotational period of said camshaft on the basis of output signals from said crank angle sensor and said cam sensor; a second rotational phase detecting unit which can detect said rotational phase in an arbitrary timing regardless of the rotational period of said camshaft; and a correcting unit which corrects the rotational phase detected by said second rotational phase detecting unit with the rotational phase detected by said first rotational phase detecting unit.