Abstract
For solving the problem of low engine fuel economy caused by the low average driving speed in the running process of the hybrid power city bus, a control strategy based on the speed and the state of charge (SOC) rule extraction is proposed for hybrid electric vehicle (HEV) in this paper. Combining different vehicle speeds and battery SOC feedback to find the best fuel economy engine and motor status based on the traditional power-based control strategy, and to enable the battery pack to prolong life. The control strategy model is built in MATLAB/SIMULINK software in order to verify the effectiveness of the control strategy, and imported into the Cruise software to carry out co-simulation with the built vehicle power system model. The simulation results show that the proposed control strategy has good working condition adaptability compared with other rule based control strategies and the balance control of SOC is within 5%. It is shown that the design of the hybrid electric bus control strategy not only improves the fuel economy of the engine, but also prolongs the battery life.
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