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- 2018
基于最优轨迹的两挡无动力中断变速器控制方法
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Abstract:
为了改善电动汽车的动力性和经济性，越来越多的研究者选择在电动汽车上加装无动力中断变速器。该文关注无动力中断变速器的换挡过程的控制方法，以减少换挡过程中的冲击和滑摩功；展示了一种无动力中断变速器的结构，并建立电动汽车传动系统的模型；然后对模型进行离散化，针对特定的评价函数进行最优化分析，得到最优控制序列和轨迹。在此基础上，应用一种结合前馈控制和反馈控制的控制方法对变速器进行控制。仿真结果表明：该控制方法能够减少换挡过程的滑摩损失，降低换挡过程中车辆冲击度。
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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