Abstract This paper studies the shifting strategy and energy management of a two-motor drive powertrain for extended-range electric buses. To do this, a multibody dynamic model is first established for transient investigation. A novel shift schedule is second proposed by integrating a priority factor for the engaging gear into the equivalent motor efficiency. According to vehicle speed and power, the shift schedule results in two possible cases: single-gear and double-gear change. Optimal shifting strategies are third recommended to eliminate the torque interruption under those possible gear changes. To optimize the torque allocation to two motors and minimize fuel consumption, a model predictive control-based energy management strategy is then developed. Finally, this paper simulates shift quality and energy economy in comparison with a conventional one-motor drive powertrain. The results show that torque interruptions generate large jerks in the one-motor configuration. Conversely, the two-motor configuration achieves great shift quality by eliminating the torque interruptions mostly during single-gear upshift or entirely under double-gear downshift. The two-motor drive powertrain also improves energy economy significantly by 9.1% compared to the conventional configuration.

中文翻译：

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增程式电动客车双电机驱动动力系统换挡策略及能量管理

摘要 本文研究了增程式电动客车双电机驱动动力总成的换档策略和能量管理。为此，首先建立多体动力学模型用于瞬态研究。通过将啮合齿轮的优先因素整合到等效电机效率中，第二个提出了新颖的换档计划。根据车速和功率，换档方案导致两种可能的情况：单档和双档。第三推荐最佳换档策略，以消除那些可能换档时的扭矩中断。为了优化两个电机的扭矩分配并最小化燃料消耗，随后开发了基于模型预测控制的能量管理策略。最后，本文模拟了与传统单电机驱动动力系统相比的换档质量和能源经济性。结果表明，在单电机配置中，扭矩中断会产生较大的冲击。相反，双电机配置通过消除主要在单档升档或完全在双档降档期间的扭矩中断来实现出色的换档质量。与传统配置相比，双电机驱动动力总成还显着提高了 9.1% 的能源经济性。