Fuzzy PID based digital control technology for aircraft cabin pressure

The pressure of aircraft cabins is closely related to the flight altitude, flight speed and gas flow of aircraft. To improve comfort and security during flight, pressure and pressure change rate should not only satisfy the requirements of structure but also the demand of aerospace physiology. Therefore, the control system for aircraft cabin pressure is one typical nonlinear time varying system with multitasks and transient response. Reliably, rapidly and stably are the key performances of control system for aircraft cabin pressure. This paper put forward an all-digital control technology for large aircraft cabin pressure. Control algorithm based on fuzzy PID was used and adjusted by rule-based expert systems. Simulation test and ground experiment are presented. The method this paper described can carry out control of aircraft cabin pressure rapidly and stably.