Road Load Measurement Using Coastdown Techniques

Scope:

To establish a procedure for determination of truck and bus vehicle road load force. It employs the coastdown method and applies to truck and bus vehicles designed for on-road operation. The final result is a model of road load force (as a function of speed) during operation on a dry, level road under reference conditions and the transmission in neutral.

Rationale:

This document will fill a void in the test procedures available to the truck and bus community.

AKA:
  • SAE J 2978
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