Chassis Dynamometer Test Procedure-Heavy-Duty Road Vehicles
J2177
This SAE Recommended Practice has been adopted by SAE to specify:
a. A standard procedure for chassis dynamometer testing of heavy-duty road vehicles for the purpose of determining power delivered through the drive tires.
b. A method of correcting observed power to reference test conditions.
c. A method of analyzing the test data to determine if the test results are within expected power ranges.
This document is applicable to DOT Class 6, 7, and 8 and on and on/off highway heavy-duty road vehicles equiped with compression ignition engines, manual or automatic transmissions, and single or tandem rear drive axles.
Rationale: This procedure covers technology and processes which are mature and not likely to change in the foreseeable future. The committee could also not confirm any current users of this procedure. It is assumed that all heavy-duty vehicle engine power testing is conducted on dynamometer and not in-vehicle on a chassis dynamometer.
