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Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Optimization of Shift Control to Improve Driving Efficiency of Battery Electric Vehicles with Two-speed Transmission

2단 변속기 적용 전기차의 구동 효율 향상을 위한 변속 제어 최적화

  • 정택호 (국립환경과학원) ;
  • 김영희 (호서대학교 벤처대학원 융합공학과)
  • Received : 2023.04.19
  • Accepted : 2023.05.30
  • Published : 2023.06.30
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Abstract

Recently, the global automobile industry is aiming for a transition from internal combustion locomotives to zero-emission vehicles. Electric vehicles powered by battery energy can operate at peak performance and improve fuel economy by applying multiple motors or multi-speed transmissions. In order to design a two-speed transmission, it is necessary to evaluate and analyze the application system and performance of electric vehicles. In this study, control performance optimization of a twostage battery electric vehicle equipped with an AMT-based automatic transmission was performed and performance according to control pattern changes was analyzed. In order to improve the operating efficiency of the motor, the shift control that sets the optimal operating point according to the vehicle speed and required torque was derived from the motor efficiency map. The performance of battery energy consumption and transmission loss energy according to the hysteresis interval was analyzed and optimized. The hysteresis interval applied to the optimal shift map acted as a factor in reducing the frequency and loss of shifts. It has been shown that keeping the hysteresis interval at about 4 km/h can reduce energy consumption while reducing the number of shifts.

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References

  1. M. R. Ahssan, M. M. Ektesabi and S. A. Gorju, "Electric Vehicle with Multi-Speed Transmission: A Review on Performances and Complexities," SAE Int. J. Alt. Power, Vol. 7, No. 2, 2018, pp. 169~181. https://doi.org/10.4271/08-07-02-0011
  2. Wu G, Zhang X and Dong Z, "Impacts of Two-Speed Gearbox on Electric Vehicle's Fuel Economy and Performance," SAE Technical Paper, 2013-01-0349, 2013.
  3. D. V. Ngo, "Gear shift strategies for automotive transmissions," Eindhoven Univ. Technol., 2012.
  4. M. R. Ahssan, M. Ektesabi and S. Gorji, "Gear Ratio Optimization along with a Novel Gearshift Scheduling Strategy for a Two-Speed Transmission System in Electric Vehicle," Energies 13, No. 19, 5073, 2020.
  5. B. Zhu, N. Zhang, P. Walker, X. Zhou, W. Zhan, Y. Y. Wei and N. Ke, "Gear shift schedule design for multispeed pure electric vehicles," P. I. Mech. Eng., Vol. 229, No. 1, 2015, pp. 70~82. https://doi.org/10.1177/0954407014521395
  6. B. Skugor, J. Deur and V. Ivanovic, "Dynamic Programming-Based Design of Shift Scheduling Map Taking into Account Clutch Energy Losses During Shift Transients," SAE Technical Paper, 2016-01-1116, 2016.
  7. N. Kim, A. Rousseau, and E. Rask, "Parameter Estimation for a Lithium-Ion Battery From Chassis Dynamometer Tests," IEEE Trans. Veh. Technol., Vol. 65 No. 6, 2016, pp. 4393~4400. https://doi.org/10.1109/TVT.2015.2495322