The research of energy management strategy for HEV

The driving performance and fuel economy of hybrid electric vehicle(HEV) largely depend on energy management strategy. The principle of power system energy management for HEV is presented in this paper, and energy management strategies from the country and the abroad are reviewed, their advantages and disadvantages are also analyzed. The paper concludes the existing problems of those strategies, and looks forward to the development trends of energy management strategy. Aiming at the problem of the misbalance in practical and global optimization using traditional energy management strategies, a new energy management strategy for HEV based on Pontryagin's Minimum Principle (PMP) is developed, which research the intent of the driver and the operation state identification of HEV based on Markov theory, in full consideration of the people-vehicle-road influence on power management control system, and finally, the problem of global optimum in energy management in case of variation of real operating conditions is solved.