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Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold

Author

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  • Zewen Meng

    (College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
    Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China)

  • Tiezhu Zhang

    (College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
    Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China)

  • Hongxin Zhang

    (College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
    Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China)

  • Qinghai Zhao

    (College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
    Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China)

  • Jian Yang

    (College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
    Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China)

Abstract

Considering the problems of the low energy recovery efficiency and the short driving range of pure electric vehicles, a new electromechanical–hydraulic coupled power electric vehicle is proposed. First, we develop an electromechanical–hydraulic coupled power electric vehicle model and design an energy management strategy to match it. On this basis, an optimization strategy is proposed with the goal of improving the braking energy recovery efficiency and avoiding the impact of high-speed braking energy recovery on the hydraulic system. The energy recovery mode conversion is optimized for different vehicle speeds when braking. Finally, the proposed optimization strategy is verified by joint simulation. The results show that when the vehicle speed is higher than 10 m/s for energy recovery mode switching, the total recovery efficiency of the whole vehicle increases to 97.273% and the SOC of the power battery increases by 0.14%. This provides strong support for improving the driving range of electromechanical–hydraulic coupled power electric vehicles.

Suggested Citation

  • Zewen Meng & Tiezhu Zhang & Hongxin Zhang & Qinghai Zhao & Jian Yang, 2021. "Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold," Energies, MDPI, vol. 14(17), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5300-:d:622495
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    References listed on IDEAS

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