Patent ID: 6644253
Filing Date: 2003-11-11
Classification: F01L

Abstract:
A method of controlling an electromagnetic valve actuator having a valve head that moves between an open position and a closed position against a valve seat, an armature coupled to the valve head, and a solenoid coil near the armature, said method comprising:measuring the position of the armature and the current of the solenoid coil; estimating the speed of the armature based on the measured position of the armature; estimating a disturbance force based on the measured position of the armature and the measured current of the solenoid coil; computing a desired signal based on the measured position, the estimated speed, the disturbance force and a reference trajectory; and controlling the solenoid coil to softly seat the armature against the solenoid coil and the valve head against the valve seat based on the computed desired signal.