Modeling method of test bed for semi-physical simulation and engine coupling performance model

The invention relates to a modeling method of a test bed for semi-physical simulation and an engine coupling performance model. The invention relates to the technical field of engineering system modeling. According to the method, the flow of an outlet, the rear total pressure of a valve, a total pressure loss coefficient and a speed coefficient are determined by establishing a pressure inlet, back pressure and valve opening given by a total valve mathematical model; a heater model is established, and the heater temperature after alcohol combustion is determined through heat release of alcohol and temperature rise of gas; and PID controller parameters of the engine test bed coupling model are determined, a transfer function of the total temperature test bed is determined, and parameters used by the controller are set. According to the modeling and control strategy, the rapidity of model calculation is taken into consideration, the calculation accuracy is ensured by using the integral relation of pressure and f