Fuzzy control of aircraft environmental control system

Ground-tests proved that aircraft ECS (environmental control system) with conventional PID (proportional-integral-differential) controlling means could not refrigerate the electronic equipment and cabin satisfactorily. A new fuzzy control model is proposed which consists of some membership functions expressed by triangle function or trapezoid function. According to ECS operation tasks, two different fuzzy control rule bases are adopted in system process control. Genetic algorithm is utilized for tuning the parameters of the membership functions of the antecedent and the consequent. Compared computer simulation with ground-tests, the aircraft ECS with new fuzzy controller could satisfy aircraft system design demands. And it is demonstrated that the new fuzzy controlling means based on genetic algorithm is more stable and faster than PID controlling means in the existing system.