Abstract
This paper is based on the use of a personal computer (PC-AT), ADDA (analogue to digital/digital to analogue card) and an electro-pneumatic transducer to control an aseptic processing high-temperature short-time (HTST) system, which requires accurate temperature control. In this study fuzzy algorithms based on linguistic rules describing the operator's control strategy were applied to temperature control. The controller, with suitable membership functions, rules and defuzzification mechanism, was a simple controller for regulation of the HTST temperature and can be compared to the conventional proportional-integral-derivative (PID) method which controlled temperature within ±0.5°C. Some results were not better than obtained with a traditional PID controller but in certain temperature ranges it could control the system temperature as well as the PID controller based on self-tuning of the rules and membership functions for the system.
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