Time delay temperature control with IMC and closed-loop identification

For systems with time delay, several control strategies have been developed, for example, Smith predictor control, IMC (Internal Model Control), LQG and so on. IMC is one of the simple design methods for systems with time delay, however, the above model based controller requires exactly parameter, including the value of time delay. Time delay systems exist in the process control and it is difficult for the process system to make a mathematical model. In order to derive a good closed-loop property, closed-loop identification is one of the strongly strategy. This paper deals with experimental results for a cooling temperature control systems with an input time delay by using a joint design method of closed-loop identification and IMC. The results show that the closed-loop has good performance with easily parameter setting compared with ordinary PID control.