A Feedback Hierarchical Operation based Energy Management Strategy for Hybrid Electrical Vehicle

Energy management strategy (EMS) is a key element for the total cost of hybrid electric vehicle (HEV). The total cost is composed of fuel and electric energy consumption of the HEV. In order to improve the economy of the vehicle significantly, the start-up cost of the internal combustion engine (ICE) and electric motor (EM) need to be considered adequately when studying the EMS. But, start-up cost is dependent on time, which makes it difficult to apply dynamic programming (DP) to the EMS. To make the start-up cost relatively easy to handle, the HEV control problem is converted to an optimal switch problem in this paper. Then, we proposes a feedback hierarchical operation (FHO) algorithm, which can get optimal schedule of HEV. In the end, simulations are presented to verify the effectiveness of the FHO algorithm.