Downshifting Strategy Using Gear Skipping During Normal Braking in Electric Vehicles Equipped with AMT

Year : 2025 | Volume : 12 | Issue : 02 | Page : 8 19
    By

    Ryong Kim,

  • Kyong Su Ri,

  • Myong Ho Kwon,

  • Jong Chol Kil,

  1. Assistant Professor, Department of Mechanical Engineering, KimChaek University of Technology, Pyongyang, DPR, Korea
  2. Assistant Professor, Department of Mechanical Engineering, KimChaek University of Technology, Pyongyang, DPR, Korea
  3. Assistant Professor, Department of Mechanical Engineering, KimChaek University of Technology, Pyongyang, DPR, Korea
  4. Assistant Professor, Department of Mechanical Engineering, KimChaek University of Technology, Pyongyang, DPR, Korea

Abstract

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In this paper, the regenerative braking method using optimal downshifting is investigated to increase the recovering energy during normal braking in an electric vehicle equipped with Automatic Manual Transmission (AMT). First, the modeling of the electric vehicle powertrain and consideration of brake force distribution was carried out. Based on these, the method to select general downshifting points was mentioned in the electric vehicle. Second, the effect of power interruption on the selection of the gear shifting points was considered, due to the power interruption during the downshift in the AMT. The necessity of gear skipping was considered because of the presence of energy that was not recovered during the gear shifting process. A reasonable downshifting strategy was established under normal braking condition. Then, using Isight and Matlab co-simulation, the optimal downshifting points were selected and the optimal shift gear order was determined to maximize the braking energy recovery in the given initial braking velocity and gears using shift gear order matrix. Finally, the simulation of the running process was carried out using Matlab/Simulink simulation interface, and a comparative analysis of the recovered energy was performed for the case of a sequential downshifting strategy and downshifting strategy with gear skipping in the normal braking condition. The simulation result shows that the proposed downshifting strategy increased 10.9% for the fixed initial braking speed and braking strength and 5.93% for the Urban Dynamometer Driving Schedule (UDDS) operating cycle condition compared to the sequential downshifting strategy. Through the simulation, it shows that downshifting strategy proposed in this paper can effectively recover the energy during braking process.

 

Keywords: AMT, gear skipping, regenerative braking, power interruption, electric vehicle

[This article belongs to Journal of Automobile Engineering and Applications ]

How to cite this article:
Ryong Kim, Kyong Su Ri, Myong Ho Kwon, Jong Chol Kil. Downshifting Strategy Using Gear Skipping During Normal Braking in Electric Vehicles Equipped with AMT. Journal of Automobile Engineering and Applications. 2025; 12(02):8-19.
How to cite this URL:
Ryong Kim, Kyong Su Ri, Myong Ho Kwon, Jong Chol Kil. Downshifting Strategy Using Gear Skipping During Normal Braking in Electric Vehicles Equipped with AMT. Journal of Automobile Engineering and Applications. 2025; 12(02):8-19. Available from: https://journals.stmjournals.com/joaea/article=2025/view=0


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Regular Issue Subscription Original Research
Volume 12
Issue 02
Received 26/03/2025
Accepted 04/06/2025
Published 14/06/2025
Publication Time 80 Days
25

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