Recently, a lot of attention has been paid to variable engine valve control because it can make the pumping losses smaller and improve torque performance. Variable valve timing permits the control of internal exhaust gas recirculation, so making fuel economy better and making less NOx emissions. In this chapter we present some results for designing and operating a special linear electromagnetic motor as variable engine valve actuator. Based on a non-linear model a particular sliding controller is presented to be applied for the designed actuator. A cascade PID-PID controllers is taken into account for its control. The cascade structure consists of an external PID controller and an internal one. The two loops are analyzed using a Lyapunov approach to obtain stable loop controls. A steady-state error equal to zero is achieved using a feedforward
control which is applied. Computer simulations of the controlled system are presented which demonstrate the effectiveness of the proposed sliding mode control scheme.