| AUTOMOTIVE ENGINEERING |
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Control algorithm for a seamless shifting 2-speed transmission based on the optimal trajectory |
| TAI Yuzhuo, SONG Jian, LU Zhenghong, FANG Shengnan, NGUYEN Truong Sinh |
| State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China |
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Abstract To improve the dynamics and energy efficiencies of electric vehicles (EVs), many researchers have decided to equip EVs with seamless shifting transmission. This paper focuses on the control algorithm for a seamless shifting transmission that reduces the shock and friction losses during shifting. An EV powertrain model is developed that includes the seamless shifting transmission and then discretized. The discrete time algebraic equation and the objective function are then used to calculate the optimal control vectors and reference trajectories of the rotational speeds. The control vectors and trajectories are then used to develop a control algorithm which contains both feed forward and feed backward parts to control the transmission. Simulations show that the algorithm not only reduces the friction loss, but also lessens the shock during shifting.
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| Keywords
transmission
electric vehicle
optimal trajectory
gear shifting control
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Issue Date: 15 April 2018
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2018,
Vol. 58
