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Optimal Design of Power-On Downshift Control of Series-Parallel Hybrid Transmission Based on Motor Active Speed Regulation

Author

Listed:
  • Xiangyang Xu

    (School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
    Ningbo Institute of Technology, Beihang University, Ningbo 315832, China)

  • Kun Guo

    (School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
    Ningbo Institute of Technology, Beihang University, Ningbo 315832, China)

  • Xuewu Liu

    (School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
    GAC Automotive Research and Development Center, Guangzhou 511434, China)

  • Hongzhong Qi

    (GAC Automotive Research and Development Center, Guangzhou 511434, China)

  • Peng Dong

    (School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
    Ningbo Institute of Technology, Beihang University, Ningbo 315832, China)

  • Shuhan Wang

    (School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
    Ningbo Institute of Technology, Beihang University, Ningbo 315832, China)

  • Wei Guo

    (Ningbo Institute of Technology, Beihang University, Ningbo 315832, China)

Abstract

Multi-speed transmission is the main development direction of hybrid transmission, which has brought higher shift quality requirements than traditional fuel vehicle transmission. However, there is less research on the shifting control of hybrid transmission, especially for the shifting control of dedicated hybrid transmission (DHT), which uses the wet clutch as a shift element. This paper studies the power-on downshift process of a two-speed series-parallel hybrid transmission, proposes a shifting control strategy based on motor active speed regulation, and deeply analyzes the causes of maximum impact during the shifting process. The results show that the reverse torque produced in the process of eliminating the remaining slip is the root cause of the maximum impact. On this basis, two optimization strategies are proposed to reduce the shift impact and improve the shift quality. The simulation results show that the proposed optimization strategies can effectively suppress the shift impact. In the meanwhile, for any control pressure of the OG (off-going) clutch in the speed phase within the range of (2.44–2.53 bar), a high shift quality in which the maximum impact is controlled lower than 10 m/s 3 can be achieved, which has high engineering value and practical significance.

Suggested Citation

  • Xiangyang Xu & Kun Guo & Xuewu Liu & Hongzhong Qi & Peng Dong & Shuhan Wang & Wei Guo, 2022. "Optimal Design of Power-On Downshift Control of Series-Parallel Hybrid Transmission Based on Motor Active Speed Regulation," Energies, MDPI, vol. 15(17), pages 1-18, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6214-:d:898379
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    References listed on IDEAS

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    1. Waruna Maddumage & Malika Perera & Rahula Attalage & Patrick Kelly, 2021. "Power Management Strategy of a Parallel Hybrid Three-Wheeler for Fuel and Emission Reduction," Energies, MDPI, vol. 14(7), pages 1-30, March.
    2. Xie, Shaobo & Hu, Xiaosong & Xin, Zongke & Brighton, James, 2019. "Pontryagin’s Minimum Principle based model predictive control of energy management for a plug-in hybrid electric bus," Applied Energy, Elsevier, vol. 236(C), pages 893-905.
    3. Tang, Xiaolin & Zhang, Dejiu & Liu, Teng & Khajepour, Amir & Yu, Haisheng & Wang, Hong, 2019. "Research on the energy control of a dual-motor hybrid vehicle during engine start-stop process," Energy, Elsevier, vol. 166(C), pages 1181-1193.
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