Study on pressure control strategy of high-altitude multi-environmental parameter simulation cabin system

The high-altitude multi-environmental parameter (temperature, pressure and humidity) simulation cabin is of far reaching significance for studying the plane environmental control system. It is very difficult for the traditional test approach and control method to realize decoupling control of pressure and other environmental parameters and multi-parameter simulation fast and exactly. For this reason, the testing method in which the environmental cabin pressure is controlled only by an air evacuation valve and the two degree of freedom PID pressure control strategy based on nonlinear compensation were proposed to control pressure in the cabin fast. The controller can overcome the nonlinear flow character of the air evacuation valve with the nonlinear compensation part and pressure control overshoot with the two degree of freedom PID structure. The simulation results show that the multi-parameters simulation and decoupling control can be realized and the pressure control precision and respond speed can be improved by the new test approach and pressure control strategy, which is also suitable for other occasions of controlling the pressure.