A Robust Automatic Tuning for Process with Dominant Dead Time

This paper presents a new algorithm for robust automatic tuning of first order process with dominating delay. At first, the controller is replaced by a relay, thus generating a stable limit cycle. A simple identification method based on time response is derived. Then, for enhancing the system robustness, a novel dead time compensator (DTC) with 2^nd Butterworth filter (2BF) is proposed. The data of the responses is used to tune the DTC. Simulations show effectiveness and robustness of the auto-tuner as well as the improved performance gained by the automatic tuned DTC with 2BF for high-order process with long dead time though it contains a simple model (FOPDT).