电动汽车多速变速器结构无急动换档的基本限制
Fundamental limitations to no-jerk gearshifts of multi-speed transmission architectures in electric vehicles
摘要：
多速变速器可以提高性能并降低电动汽车的总体成本，但它们也带来了一个挑战：避免换档急动，这有时在电机和离合器饱和的情况下可能被证明是不可能的。在这篇文章中，我们介绍了三个定理，明确定义的基本限制，无加加速度换档电机或致动器饱和。我们比较换档，包括从一个摩擦离合器传递扭矩到另一个，在这种情况下，其中一个离合器是单向离合器。我们表明，系统与单向离合器更容易电机饱和，导致换档颠簸往往是不可避免的。我们还研究了行星齿轮组对换档动力学轨迹的影响，并揭示了对无冲击极限的影响。这项工作提供了工具，比较传输架构在概念设计阶段的一个新的电动汽车。
英文摘要：
Multi-speed transmissions can enhance the performance and reduce the overall cost of an electric vehicle, but they also introduce a challenge: avoiding gearshift jerk, which may sometimes prove to be impossible in the presence of motor and clutch saturation. In this article, we introduce three theorems that explicitly define the fundamental limitations to no-jerk gearshifts resulting from motor or actuator saturation. We compare gearshifts that consist of transferring transmission torque from one friction clutch to another, to the case in which one of the clutches is a one-way clutch. We show that systems with a one-way clutch are more prone to motor saturation, causing gearshift jerk to be more often inevitable. We also study the influence of planetary gearsets on the gearshift dynamical trajectories, and expose the impact on the no-jerk limitations. This work offers tools to compare transmission architectures during the conceptual design phase of a new electric vehicle.
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