论文标题
通过分析建模和优化的电动汽车的传输比率设计
Transmission Ratio Design for Electric Vehicles via Analytical Modeling and Optimization
论文作者
论文摘要
在本文中，我们提出了一种有效的分析建模方法，用于设计电动汽车的传输。具体而言，我们首先设计了电动机的分析损失模型，并表明只能通过对原始电机图中的三个点进行采样来精确拟合。其次，我们利用此模型来得出最佳的传输比，这是车轮速度和扭矩的函数，并使用它来优化传输比。最后，我们使用现实世界中的案例研究展示了我们的分析方法，该方法比较了BMW i3上的两种不同的传输技术：固定齿轮传输（FGT）和连续可变的传输（CVT）。我们的结果表明，即使是针对FGT设计的电子机器，CVT的实施也可以显着提高其运营效率超过3％。提供的模型最终将弥合差距，以了解如何以综合方式有效地指定电子机器和传输技术，并能够有效地比较单速和多速的电动动力总成。
In this paper we present an effective analytical modeling approach for the design of the transmission of electric vehicles. Specifically, we first devise an analytical loss model for an electric machine and show that it can be accurately fitted by only sampling three points from the original motor map. Second, we leverage this model to derive the optimal transmission ratio as a function of the wheels' speed and torque, and use it to optimize the transmission ratio. Finally, we showcase our analytical approach with a real-world case-study comparing two different transmission technologies on a BMW i3: a fixed-gear transmission (FGT) and a continuously variable transmission (CVT). Our results show that even for e-machines intentionally designed for a FGT, the implementation of a CVT can significantly improve their operational efficiency by more than 3%. The provided model will ultimately bridge the gap in understanding how to efficiently specify the e-machine and the transmission technology in an integrated fashion, and enable to effectively compare single- and multi-speed-based electric powertrains.
