商用卡车和客车.车辆性能预测的SAE推荐规程和领航图

[中文适用范围]： 本 SAE 推荐做法考虑了收集和总结对车辆稳态性能有影响的数据的现代标准化方法@例如发动机输出（总输出和净输出）@传输损失@传动系统效率@各种车辆和车身的车辆空气动力装置配置@以及由海拔和气压影响引起的路面变化和空气密度变化。该程序不涉及车辆瞬态性能（加速@制动@和转弯）@，因为需要大量附加数据，例如所有旋转部件的转动惯量。它也不涉及带有变矩器和自动变速器的车辆。因此，本文件适用于具有固定传动比型变速器和强制接合离合器的车辆。本程序末尾的公制换算表中提供了公制和 ISO 单位换算（请参阅附录 B）。一些配备电子发动机控制装置的现代车辆能够改变每个档位@的最大发动机转数，并且如果爬坡时在较低档位@上花费更多时间，则允许功率或转速增加。这些特殊情况可以通过此过程@处理，只需定制每个传动比的数据并将长期数据叠加在瞬时数据之上。所有方程均以适合使用电子表格/数据库或高级语言@（例如Basic@Fortran@Pascal@C或Unix@等）编程到大型机或台式计算机@中的形式编写。但是@它们是足够简单@可以在手持计算器上执行。 [外文原描述]： This SAE Recommended Practice takes into account modern standardized methods for collecting and summarizing data that has an effect on vehicle steady-state performance, such as engine output (gross and net), transmission losses, drivetrain efficiency, vehicle aerodynamic devices for various vehicle and body configurations, as well as road surface variations and air density variations resulting from altitude and barometric effects. The procedure does not address vehicle transient performance (acceleration, braking, and cornering), because of the considerable amount of additional data required such as moment of inertia of all the rotating parts. Nor does it address vehicles with torque converters and automatic transmissions. This document is, therefore, intended for vehicles having fixed-ratio type transmissions and positive engagement clutches. Metric and ISO unit conversions are provided in the metric conversion tables at the end of this procedure (see Appendix B ).Some modern vehicles with electronic engine controls have the ability to vary the maximum engine revolutions for each gear, as well as permitting the power or rpm to increase if more time is spent in the lower gears, as when climbing a grade. These special cases can be handled by this procedure, just by customizing the data for each transmission ratio and superimposing the long-term data on top of the instantaneous data.All of the equations are written in a form suitable for programming into a mainframe or desk-top computer, using a spreadsheet/database or a higher level language, such as Basic, Fortran, Pascal, C or Unix, etc. However, they are simple enough, to be performed on a hand-held calculator.Cross Reference: J1489,J688