Patent ID: 6213070
Filing Date: 2001-04-10
Classification: F02D,Y02T

Abstract:
A control apparatus for an internal combustion engine, comprising:an operating condition detector for detecting an operating condition of the internal combustion engine;a crank angle position detector for detecting a crank angle position of the engine;a variable valve timing mechanism for changing a valve timing of at least one of an intake valve and an exhaust valve so as to change a valve overlap amount of said intake and exhaust valves;an actual advance amount detector for detecting an actual valve timing position every predetermined crank angle position;a target advance amount setter for setting a target valve timing based upon a detection result of said operating condition detector;a controller for controlling said variable valve timing mechanism in such a manner that the actual advance amount detected by said actual advance amount detector is changed into the target advance amount set by said target advance amount setter;an advance amount deviation calculator for calculating a deviation between said target advance amount and said actual advance amount every predetermined crank angle position;a differential value calculator for calculating, at every predetermined time interval, a deviation between a current value of advance amount deviation and a preceding value thereof, which are calculated by said advance amount deviation calculator; anda control amount calculator for calculating a control amount used in said controller based upon both the advance amount deviation calculated by said advance amount deviation calculator and the differential value calculated by said differential value calculator.