SAE J2188 – Commercial Truck and Bus SAE Recommended Procedure for Vehicle Performance Prediction and Charting (Stabilized: Jul 2018)

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.