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Powersplit design and simulation

机译：Powersplit设计与仿真

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There are now three commercially available types of hydromechanical powersplit transmissions, following the announcement of the Steyr tractor CVT, joining the CLAAS HM8 and the Fendt Vario. Hydromechanical transmissions utilise the well known variable ratio benefits of hydrostatic pumps and motors combined with an epicyclic split path arrangement. This can reduce the proportion of power flowing through the variator, with consequent improvements in overall efficiency. Although the first application for these stepless transmissions has been in the tractor environment, these types of stepless concept have possibilities ins ome on-highway applications. These transmissions have complex powerflows which produce some unusual effects; on efficiency for example. This paper illustrates how Boeing EASY5 Dynamic Simulation with Ricardo Powertrain library can highlight many aspects of powersplit performance, permitting a valuable insight into the transmission's dynamic behaviour. The paper pocuses on a single application, an urban refuse collection vehicle; and a single test cycle. Three types of typical powersplit transmissions have been installed in the vehicle and are compared for their performance in terms of efficiency and fuel consumption.
机译：随着斯太尔拖拉机CVT的发布，现在加入了CLAAS HM8和Fendt Vario，共有三种商业上可买到的液压机械式动力分配变速器。液压机械变速器利用了与周转的分流路径装置相结合的静液压泵和电动机的可变比优势。这样可以减少流经变速器的功率比例，从而提高整体效率。尽管这些无级变速器的第一个应用是在拖拉机环境中，但这些类型的无级概念在公路应用中仍有可能。这些传输具有复杂的功率流，会产生一些异常的影响。例如效率。本文说明了带有Ricardo动力总成库的波音EASY5动态仿真如何突出显示动力分流性能的许多方面，从而为变速箱的动态性能提供了宝贵的见解。本文只讨论一种应用，即城市垃圾收集车；和一个测试周期。车辆中已安装了三种典型的动力总成变速器，并在效率和燃油消耗方面对它们的性能进行了比较。

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