Switched PID control of motor-load system

The position control problem of motor-load system is considered, and switched PID controllers are designed for different reference input signals. A new PID design method is developed according to model-matching principle and the problem of PID controller design is converted into fitting problem of magnitude-phase curve for restricted frequency range, first, the second-order reference model is selected to achieve performance index, and then the parameters of PID controller are obtained by solving a group of equations. Further, the reset stabilization problem of switched PID control systems is investigated, and stability of switched PID control systems is guaranteed by using controller state reset technique.