Design of temperature control system for environment simulation test based on fuzzy PID

A design method of temperature control system based on fuzzy PID is proposed in this paper with the purpose of tacking problems such as nonlinear, time-delay, time-varying in a temperature control system for environment simulation test. Control objects include chilled water and electric heating. Design approach consists of the flowing two steps: (1) find out the fuzzy relations between PID control parameters and corresponding deviations; (2) adjust PID parameters adaptively according to fuzzy rules. This method is applied in a large environment simulation test system successfully, it has a good stability and accuracy.