Patent ID: 6494172
Filing Date: 2002-12-17
Classification: F01L,F02D,Y02T

Abstract:
An electromagnetically operable engine valve assembly for an internal combustion engine, comprising:a movable element; a spring element to bias the movable element at a neutral position; an electromagnet unit faced against the movable element; a control apparatus to control a current supplied to the electromagnet unit to drive the movable element so as to regulate a displacement of a valve body associated with the movable element, the control apparatus comprising: an initialization control section that repeatedly executes an initialization control such that the current is supplied for the electromagnet unit to move the movable element rested at the neutral position to an initial position; a position detector enabled to detect a position of the movable element with respect to the electromagnet unit; a first current supply control section that performs a feedback control of the current supplied to the electromagnet unit during the execution of the initialization control by a feedback control gain; and a feedback control gain varying section that varies the feedback control gain for each execution of the initialization control.