Dynamic mathematic modeling of fuel cell vehicle powertrain

Constructed here is dynamic mathematic model of the fuel cell vehicle powertrain which is composed of fuel cell engine, DC/DC, power battery, DC motor and its controller, To model the powertrain, the equivalent physical model of the powertrain was abstracted firstly. Based on the equivalent physical model and characteristics of main components of the powertrain, state equations of the each component were listed, which constitute the dynamic mathematic model of the powertrain. To estimate the unknown parameters of the equations, the least square parameters estimation method was employed. Based on the mathematic model, control method of the powertrain was developed, which uses full-states close-loop feedback. The results of simulation and field test are illustrated. The results show that the control method performs well and the mathematic model constructed can represent characteristics of the powertrain approximately, and the model can be applied in subsequent design of control strategy for the fuel cell vehicle powertrain.