Expert controller mainly plays the function of retaining temperature invariable when the measured
temperature reaches the range of experimental precision. Therefore, it can make the furnace temperature stabile and avoid the temperature shock in the error range, rapidly meeting the test requirements. Expert
PID controller is mainly composed of expert decision in form of the program statements “if-then”.
The expert fuzzy PID controller is mainly composes of fuzzification, fuzzy reasoning, defuzzification
and expert decision, and the design process can be described as follows.