Valve timing control apparatus for internal combustion engines

Abstract

A valve timing control apparatus for internal combustion engines, capable of obtaining a stable responsibility, and correcting a scatter of the characteristics of the apparatus and the variation thereof occurring with the lapse of time is provided. A valve timing control apparatus is provided with a valve opening and closing cam adapted to be driven by a crankshaft of an internal combustion engine, a valve timing varying means adapted to vary a rotational phase between the (cam and crankshaft, a detector adapted to detect an acting position of the valve timing varying means, and a control means adapted to output a control variable with respect to the valve timing varying means, the control means storing normative characteristics of the valve timing varying means, computing a target valve timing position, comparing a valve timing position detected by the acting position detector and a valve timing position of the normative characteristics with each other with respect to a target valve timing position, and determining a control variable with respect to the valve timing varying means on the basis of the results of the comparison.

Dependencies are inferred from the claim text.