Method of controlling energization of electro-magnetically driven valve with variable feedback gain

摘要

A control method with variable feedback gain for energization of an electro-magnetically driven intake/exhaust valve of an internal combustion engine increases opening and closing speeds of the intake/exhaust valve driven with electromagnets having small capacity and improves the control performance in bringing the final speed of the opening and closing action of the valve close to zero. According to the variable feedback gain energization control method, a target moving speed of the armature relative to the electromagnets is determined dependent upon a spacing distance of the armature from the electromagnet; at least a part of energization of the electro-magnetically driven valve is controlled through feedforward control so as to make an actual moving speed of the armature relative to the electromagnets in conformity with the target moving speed while at least the other part of the energization is controlled through feedback control based upon a deviation of the actual moving speed from the target moving speed. And a gain of the feedback control is changed based upon a relation between the actual moving speed and the target moving speed. The energization control is modified through learning modification based upon the deviation between the actual and target moving speeds and the actual value of the final speed of opening and closing the valve.