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Energies
Volume 14
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10.3390/en14175300
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Article

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

by
Zewen Meng
1,2,
Tiezhu Zhang
1,2,
Hongxin Zhang
1,2,*,
Qinghai Zhao
1,2 and
Jian Yang
1,2
1
College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
2
Power Integration and Energy Storage Systems Engineering Technology Center (Qingdao), Qingdao 260071, China
*
Author to whom correspondence should be addressed.
Energies 2021, 14(17), 5300; https://doi.org/10.3390/en14175300
Submission received: 31 July 2021 / Revised: 18 August 2021 / Accepted: 22 August 2021 / Published: 26 August 2021
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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.
Keywords: electromechanical–hydraulic coupled power electric vehicle; energy management strategy; vehicle speed threshold; energy recovery efficiency electromechanical–hydraulic coupled power electric vehicle; energy management strategy; vehicle speed threshold; energy recovery efficiency

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MDPI and ACS Style

Meng, Z.; Zhang, T.; Zhang, H.; Zhao, Q.; Yang, J. Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold. Energies 2021, 14, 5300. https://doi.org/10.3390/en14175300

AMA Style

Meng Z, Zhang T, Zhang H, Zhao Q, Yang J. Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold. Energies. 2021; 14(17):5300. https://doi.org/10.3390/en14175300

Chicago/Turabian Style

Meng, Zewen, Tiezhu Zhang, Hongxin Zhang, Qinghai Zhao, and Jian Yang. 2021. "Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold" Energies 14, no. 17: 5300. https://doi.org/10.3390/en14175300

APA Style

Meng, Z., Zhang, T., Zhang, H., Zhao, Q., & Yang, J. (2021). Energy Management Strategy for an Electromechanical-Hydraulic Coupled Power Electric Vehicle Considering the Optimal Speed Threshold. Energies, 14(17), 5300. https://doi.org/10.3390/en14175300

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