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Chassis Dynamometer Simulation of Road Load Using Coastdown Techniques

This procedure covers two-wheel drive vehicle operation and single-axle electric dynamometer load coefficient adjustment to simulate track road load within the speed range of track testing and the dynamometer inertia and road load simulation capabilities. The purpose is to provide a uniform procedure for adjusting an electric chassis roll dynamometer to provide accurate simulation of the resistance which must be overcome by the vehicle powertrain to maintain steady speed on a flat road, as determined by track coastdown tests on that vehicle.

Road Load Measurement Using Onboard Anemometry and Coastdown Techniques

This SAE Recommended Practice establishes a procedure for determination of vehicle road load force for speeds between 115 and 15 km/h (71.5 and 9.3 mi/h). It employs the coastdown method and applies to vehicles designed for onroad 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 of 20 °C (68 °F), 98.21 kPa (29.00 in-Hg), no wind, no precipitation, and the transmission in neutral. This document supplements SAE J1263 FEB96. SAE J1263 remains an alternative method for evaluating vehicle road load force during low wind conditions. This procedure incorporates recent advances in test equipment and data analysis; it defines vehicle road load force over an extended speed interval.