Sliding mode servo control with feedforward compensation for Electromagnetic engine Valve

An electromagnetic engine valve (EMV) has received a great deal of attention due to the growing importance of issues such as fuel economy and environmental protection in the automotive. In this paper we propose a new positioning control method for a prototype linear motor developed for the EMV. This linear motor has nonlinear properties due to the detent force, the force ripple and the friction. We design a positioning controller using a sliding mode servo control in order to reduce the degradation of control performances caused by nonlinear properties of the prototype linear motor for the EMV. And we use a feed forward compensator in order to accomplish both high speed response and short settling time. A high pass notch filter is used as the feedforward compensator. The effectiveness of the proposed control methods are confirmed by some experiments using prototype linear motor for the EMV.