Modeling and parameters identification of high pressure fuel cell back-pressure valve

The reactant pressure of the fuel cell stack is crucial to the efficiency and lifespan of high pressure fuel cell engine. Plenty of researches have done to achieve precisely pressure control, and taking electronic throttle (ET) as back-pressure valve to control pressure is one of the most ideal techniques. In this paper, a detailed nonlinear dynamic model of back-pressure valve is provided firstly. Then, several algorithms are designed to estimate the unknown parameters in the model. Finally, the previous model and identified parameters are verified based on the xPC Target technique. The simulations show that the model and identified parameters provided in this paper have certain reliability and are important to the development of high-performance fuel cell engine controller.