Research on Power Balance Strategy of Fuel Cell Vehicle Powertrain

A comprehensive procedure for math modeling and power balance control design of a fuel cell hybrid vehicle (FCHV) is presented in this paper. The subsystems are modeled based on the lab testing and field vehicle testing results from the Tongji University START3 prototype vehicle firstly. A simulation model is then constructed based on the math model. The power balance control strategy for FCHV is subsequently developed based on the math model, which uses full-state feedback algorithm. In the power balance control strategy a Luenberger state observer is designed by pole placement to estimate the open circuit voltage(OCV) of the battery, which make full-state feedback feasible and the control strategy robust to estimated error of the battery SOC(state of charge). The states feedback controller is then designed through analyzing step respond of the powertrain and testing data. At last of the paper, the results of simulation and field test are illustrated. The results show that, the power balance control strategy designed could take into account the performance and fuel economy of the subsystems of hybrid fuel cell powertrain and give feasible control results.