Dynamic characteristics of a three-speed uninterrupted powertrain AMT
Fei LI1,2,Jian SONG1,*(),Shengnan FANG1,Haijun SONG1,Truong Sinh NGUYEN1
1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China 2. Department of Mechanized Infantry, Shijiazhuang School of Army Infantry Academy, Shijiazhuang 050083, China
This study analyzes the dynamic characteristics of a three-speed uninterrupted powertrain automatic mechanical transmission (AMT) for an electric bus. The AMT structure reduces the power interruption during shifting. A Lagrange equation is developed for the three-speed uninterrupted powertrain AMT that includes the target vehicle performance characteristics. The model is solved in MATLAB/Simulink to compare the performance characteristics of the target vehicle with this three-speed uninterrupted powertrain AMT and without a transmission with simulations of the entire acceleration and deceleration ranges of the target vehicle. The model predicts the clutch and brake torque curves during shifting and predicts the drive motor input torque and final output torque. The dynamic equations are also used to verify the feasibility of power recovery during shifting. The results show that the three-speed uninterrupted powertrain AMT improves the vehicle dynamics of electric buses and maintains power during shifting.
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2021, Vol. 61 
),方圣楠1,宋海军1
