R.K.Mudi, “Self-Tuning Fuzzy PI controller and its application to HVAC system

is used for the supply air pressure control loop for Heating, Ventilation and Air-Conditioning (HVAC) system. The self-tuning Fuzzy PI controller (STFPIC) is adjusted the output scaling factor on-line by fuzzy rules according to the current trend of the controlled process. The rule-base for tuning the output-scaling factor is defined on error and change of error of the controlled variable. Ziegler-Nichols tuned PI or PID controller performs well around normal working conditions, but its tolerance to process parameter variations are severely affected. The STFPIC is used here to overcome these shortcomings. Comparing with PID and Adaptive Neuro-Fuzzy (ANF) Controllers, simulations results show that STFPIC performances are better under normal conditions as well as when the HVAC system encounters larg