SAE J2188:2018 pdf free

SAE J2188:2018 pdf free.Commercial Truck and Bus SAE Recommended Procedure for Vehicle Performance Prediction and Charting
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.
AlI 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.
The following diagrams represent a recommended standard format for ilustrating vehicle performance with tables and graphs.’ They also represent a recommended standardized form for presenting vehicle performance in a general manner.It should be recognized that there are special vehicles, powertrains, and operating conditions that may require a different form of presentation, such as those presented in SAE J1489 Vehicle Downhill Performance Mapping Procedure.SAE J2188 pdf free download.