Research And Development Of The Energy Flow Control Of A Fuel Cell Electric Vehicle

As one of the important three types of electric vehicles (EV), the fuel fell electric vehicle (FCEV) with hydrogen fuel has become the focus of research for its unique advantages. The energy flow control system, one of the key technologies of FCEV, is studied and developed in this paper, and the related achievements are shown as follows.Firstly, based on the systematic study and synthetic analysis of the relative literatures, in this paper, key technologies and developing tendency of EVs are introduced, the technical features and the energy consumptive characteristics of FCEV are analyzed. Also, a systematic framework is established according to their control requests and characteristics.Secondly, the general structure of the energy flow control system with two kinds of power units (the battery and the fuel cell) is designed in modules, the functions and realizing method of different module are described in detail, and also the related hardware and software are developed. Furthermore, in this paper, the DSP-based control circuit, the DC/DC convertor and implement circuit of high voltage are analyzed for the hardware system of FCEV, and the control idea and the flow chart are analyzed for the software system. Some anti-interference methods are used to improve the reliability of whole system.Thirdly, to guarantee the performances and the efficiency of FCEV, an optimal control strategy is proposed for distributing the energy between the fuel cell and the battery. Also, a related control algorithm for FCEV is put forward.Finally, simulations and experiments are made respectively on the energy flow control system to prove the validity of the total scheme,the control strategy and the control algorithm. Furthermore, some new attempts are carried out for the energy flow control system of FCEV.In this paper, all the researches and practices for the development of an energy flow control system of FCEV will benefit the development of the commercial EVs with good performance and appropriate price.