Power-on downshift analysis of a seamless two-speed transmission in electric vehicles
- Publisher:
- Inderscience Publishers
- Publication Type:
- Journal Article
- Citation:
- International Journal of Vehicle Design, 2023, 92, (2-4), pp. 236-260
- Issue Date:
- 2023-01-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| tian-et-al-2023-power-on-downshift-analysis-of-a-seamless-two-speed-transmission-in-electric-vehicles.pdf | Published version | 3.77 MB |
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Electric vehicles (EVs) have many advantages over internal combustion engine vehicles (ICEs) and have caught the interest of academics and industry together. The two-speed transmission of electric vehicles improves the overall power and expands the mileage of EVs. In this paper, the power-on downshifting tactics of a seamless two-speed transmission are studied. The seamless two-speed transmission is controlled by a one-way clutch and two brakes for shifting gears. Three control strategies are proposed to achieve a smooth downshifting process. Firstly, the mathematical model of the two-speed transmission for electric vehicles is constructed. Then, three downshift strategies are analysed based on a simplified mathematical model. In this study, the difference between vehicle jerk and friction work in different downshifting strategies is explored by keeping the gearshift time unchanged. After analysing the simulation results, the advantages and disadvantages of different gear downshift strategies are summarised.
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