Patent ID: 6810841
Filing Date: 2004-11-02
Classification: F01L

Abstract:
A system for controlling a valve of an internal combustion engine, comprising: a feedback control system, comprising:an electromagnetic actuator comprising an electromagnet having a coil and an armature magnetically coupled to the coil, such armature being coupled to the valve to stroke the valve between an open and closed position in response to a drive signal fed to the coil; a feedforward controller, wherein the feedback control produces an error signal as a function of a difference between a predetermined desired position trajectory for the armature for each stroke of the armature and the actual position trajectory of the armature during such stroke, such error signal being used to produce a feedforward command signal to the feedforward controller, such feedforward controller to produce the drive signal to the coil during a subsequent stroke; and wherein the response of the feedforward controller to the error signal in providing the drive signal is an inverse function of the relationship between a change in armature position in response to a change in the drive signal.