Reliability and Efficiency of Electric Vehicle Transmissions

电动汽车变速器的可靠性和效率

• 批准号: 2436033
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2436033
• 关键词: Reliability; Efficiency; Electric; Vehicle; Transmissions

Electric vehicle (EV) design imposes particularly harsh tribological conditions on EV gearboxes. This includes the combination of high torque and low gear speed at one extreme and very high speeds with relatively low torques at another. In addition, cooling requirement call for unconventional lubricating fluids, with some of the latest lubricants developed specifically for this application containing significant amounts of water. This results in harsh tribological conditions in transmission elements such as bearings and gears while also increasing oil churning losses. This project is concerned with optimising efficiency and reliability of EV transmissions. It proposes to devise a model which is able to predict the tribological conditions and the overall power losses in transmissions suitable for use in electric vehicles. Crucially, the approach will include a detailed treatment of gear and bearing operation in order to accurately predict operational lifetimes and friction losses in these components. This will include the use of measured rheological properties of lubricants currently used or being developed for use in EV transmissions.The overall aims of this project are:- To improve the efficiency and hence increase the range of EVs through optimising transmission architecture (number of ratios, ratio split, weight) required to provide adequate input-output matching for a given vehicle duty. - To optimise EV lubricant formulation to minimise gearbox power losses (and hence extend vehicle range) while maintaining durability. Lubricant considerations will address tribological performance, cooling, electrical properties and material compatibility.

电动汽车 (EV) 设计对 EV 变速箱施加了特别严酷的摩擦条件。这包括在一个极端情况下高扭矩和低齿轮速度的组合，以及在另一种极端情况下非常高的速度和相对较低扭矩的组合。此外，冷却要求需要非常规的润滑液，一些专门为此应用开发的最新润滑剂含有大量的水。这会导致轴承和齿轮等传动元件出现恶劣的摩擦条件，同时还会增加油搅动损失。该项目致力于优化电动汽车变速箱的效率和可靠性。它建议设计一种模型，能够预测适用于电动汽车的变速器的摩擦条件和总体功率损耗。至关重要的是，该方法将包括对齿轮和轴承操作的详细处理，以便准确预测这些部件的使用寿命和摩擦损失。这将包括使用测量的当前用于或正在开发的用于电动汽车变速箱的润滑油的流变特性。该项目的总体目标是： - 通过优化变速箱架构（传动比数量、传动比分配、重量）来提高效率，从而增加电动汽车的续航里程，从而为给定的车辆任务提供足够的输入输出匹配。 - 优化电动汽车润滑油配方，最大限度地减少变速箱功率损失（从而延长车辆行驶里程），同时保持耐用性。润滑剂的考虑因素将涉及摩擦学性能、冷却、电气性能和材料兼容性。