Patent ID: 7011055

Claim:
A variable valve operating control apparatus for an internal combustion engine comprising: a Variable valve Timing Control mechanism which makes a centric phase of an operating angle of an engine valve variable due to a rotational phase of a camshaft with respect to a crankshaft being varied; a first detecting unit which detects a centric phase of an operating angle of the engine valve on the basis of an interval between a reference rotational position of the crankshaft and a reference rotational position of the camshaft; a second detecting unit which detects a centric phase of an operating angle of the engine valve at a period shorter than that by the first detecting unit; a selecting unit which selects one of the centric phase detected of late by the first detecting unit and the centric phase detected of late by the second detecting unit, on the basis of a predetermined regulation; and an operating unit which operates an opening characteristic of the engine valve on the basis of the centric phase selected by the selecting unit.