Modeling and Simulation for Temperature Control System of Environmental Control System Functional Test

In order to ensure the units of environmental control system working well before the first flight of the aircraft,ground heat air source is simulated the engine source for conducting environmental control function test of high temperature,high pressure and high flow rate gas in the stage of final assembly and test.However,the temperature control system has large inertia and lag,and aircraft inlet temperature control precision obtained in the traditional way of using manual modulation is often difficult to meet the test requirements.Hence then the model of temperature control system of ground testing equipment is built and simulated under the MATLAB environment by using PID automatic control,which contains the effects caused by the dynamic characteristics of pneumatic diaphragm control valve.The simulation results show that the test temperature obtained by PID controller can meet the technical requirements.