A design method of self-tuning Smith predictor for unknown time delay system

A design method of the self-tuning Smith predictor for an unknown time delay system is proposed. The Smith predictor is used instead of the k-step ahead predictor for overcoming the assumption that the dead-time of the plant is unknown. The validity of the proposed method has been investigated by numerical simulation. The self-tuning dead-time control (ST-DTC) is shown to be applicable to non-minimum phase systems, and to unknown time delay systems. The control rule of ST-DTC is simple, and the calculation time of control variables is short. A numerical example indicates that the control ability of ST-DTC is superior to other design techniques, for example, the fixed PID (proportional plus integral plus derivative) controller