手动变速箱和变速差速器效率以及附加损失测量

[中文适用范围]： 由于对 CAFE 和燃油排放标准的高度关注，汽车传动系统的优化势在必行。有鉴于此，零部件效率已成为传动系统决策过程中的一个重要因素。因此，有必要制定一个通用的标准来判断传输效率。本 SAE 推荐实践规定了测功机测试程序，该程序映射了手动变速箱的效率。该文档分为两部分。第一个比较整个指定输入速度范围内的输入和输出扭矩，以确定“挂档”传动效率。第二个程序测量标称怠速下空档时所经历的寄生损失以及挂档时的搅动损失。本文件适用于乘用车和轻型卡车。本文档中所有提及变速器的内容均包括变速驱动桥。 [外文原描述]： Because of the intense focus on CAFE and fuel emission StandardDetails, optimization of the automobile drivetrain is imperative. In light of this, component efficiencies have become an important factor in the drivetrain decision-making process. It has therefore become necessary to develop a universal standard to judge transmission efficiency.This SAE Recommended Practice specifies the dynamometer test procedure which maps a manual transmission’s efficiency. The document is separated into two parts. The first compares input and output torque throughout a specified input speed range in order to determine “in-gear” transmission efficiency. The second procedure measures parasitic losses experienced while in neutral at nominal idling speeds and also churning losses while in gear.The application of this document is intended for passenger car and light truck.All references to transmissions throughout this document include transaxles.Cross Reference: 820741,840054