Abstract: The problem of vehicle energy consumption and exhaust pollution has caused wide public concern over recent years, and the use of hydrogen fuel has been repeatedly demonstrated to be a viable approach to achieving near-zero emission from fuel cell vehicle. In fuel cell hybrid electric bus, the fuel economy and the durability and reliability of fuel cell engine depend largely on the complete vehicle energy management strategy. The energy management strategy based on voltage control is compared with the energy management strategy based on current control. The comparison result shows that the latter strategy is more suitable for the energy hybrid bus, because battery current is sensitive to bus voltage variation. In order to ensure the optimal operation of fuel cell engine and battery sets, energy distribution and dynamic filtering methods are included in the energy management strategy based on current control. Finally road test results show that complete vehicle fuel economy and reliability have been greatly improved.

Key words: Energy management, Fuel cell, Hybrid electric vehicle