Patent ID: 6386158
Filing Date: 2002-05-14
Classification: F01L,F02D,Y02T

Abstract:
A valve timing control apparatus for internal combustion engines comprising;a cam adapted to be driven by a crankshaft of an internal combustion engine and open and close an intake valve, a cam adapted to be driven by the crankshaft of the engine and open and close an exhaust valve, a valve timing varying means adapted to vary a rotational phase of at least one of the two cams with respect to the 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 for the valve timing varying means, wherein the control means stores the characteristics constituting a norm for the valve timing varying means, computes a target valve operating position corresponding to the operating condition of the engine, and determines the control variable of the valve timing varying means with respect to the target valve operating position on the basis of the results of a comparison between a valve timing position detected by the acting position detector and a valve timing position included in the norm-constituting characteristics.