Unified PID Tuning Approach for Stable, Integrative and Unstable Dead-Time Processes

This paper presents a unified approach for tuning PID controllers for stable, integrative and unstable dead-time processes. The approach is based on a PID approximation of the Filtered Smith Predictor that allows to control this kind of processes looking for a trade-off between performance and robustness. The proposed control tuning method is simple to analyze and use. Cases studies are included to illustrate the advantages of the proposed tuning rules. Furthermore, comparisons with other existing methods are presented to show that the proposed unified method provides promising results.