Abstract This paper compares a conventional PI control and a fuzzy logic control of an air flow pressure process in a laboratory tank system. The plant is inherently nonlinear due to a control valve, air tanks and air flow dynamic characteristics. Experimental results for each control scheme are presented. The robustness of the control systems relative to process delay time was investigated. Stability analysis of the fuzzy control system was performed in the frequency domain. Tuning of the fuzzy logic controller parameters for the desired transient response is discussed. Experimental results supported that the overall performance of the fuzzy logic controller was better than that of the PI controller . To improve the performance of the process with large process delay time, the fuzzy control system was further extended to include a predictor in the fuzzy logic control loop. The fuzzy logic-predictor control system showed effective compensation for process delay time is possible.
Wang et al. (Sun,) studied this question.