Electronic valve actuator control system and method

摘要

A method and system for controlling a valve of an internal combustion engine. The system includes an electromagnet actuator having a coil and an armature magnetically coupled to the coil. The armature is coupled to the valve to stroke the valve between an open and closed position in response to a drive signal fed to the coil. The system produces an error signal as a function of a difference between a predetermined desired position time history (i.e., position trajectory), yd, for the armature for each stroke of the armature and the actual position trajectory of the armature, y, during such stroke. The error signal is used to produce a feedforward command signal to a feedfoward controller for use in providing the drive signal to the coil during a subsequent stroke. 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.