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Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques
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English
Abstract
Reduction of vehicle road load is important in the overall effort to improve fuel economy in motor vehicles. The ability to accurately simulate vehicle road load on a chassis dynamometer is similarly critical in the process of measuring fuel economy on such a dynamometer. This paper discusses coastdown techniques of road load measurement and dynamometer simulation from the standpoint of SAE Recommended Practice J1263 developed by an SAE Task Force between 1976 and 1979. These techniques are compared to other methods and the equations used to determine the absorber setting which duplicates vehicle road load for a single parameter chassis dynamometer are developed.
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Authors
Citation
Chapin, C., "Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques," SAE Technical Paper 810828, 1981, https://doi.org/10.4271/810828.Also In
References
- White R. A. Korst H. H. “The Determination of Vehicle Drag Contributions from Coastdown Tests” SAE 720099 1972
- USEPA Office of Mobile Source Air Pollution Control Advisory Circular 55B December 6 1978
- Dayman B. Jr “Tire Rolling Resistance Measurements from Coastdown Tests” SAE 760153 1976
- Thompson G. D. “Prediction of Dynamometer Power Absorbtion to Simulate Light Duty Truck Road Load” SAE 770844 1977
- Smith J. R. Tracy J. C. Potter D. S. “Tire Rolling Resistance - A Speed Dependent Contribution” SAE 780255 1978
- Yasin T. P. “The Analytical Basis of Automobile Coastdown Testing” SAE 780334 1978
- Dayman B. Jr “Realistic Effects of Winds on the Aerodynamic Resistance of Automobiles” SAE 780337 1978
- Thompson G. D. “Prediction of Dynamometer Power Absorbtion to Simulate Light-Duty Vehicle Road Load” SAE 780617 1978
- Schurman D. Johnsson L. Berg W. “Calibration of Chassis Dynamometers for Emission and Fuel Economy Testing Using Wheel Torque Meters” SAE 800400 1980
- Vorelli A. Nuccio P. Visconti A. “Aerodynamic Drag on the Road Compared to Wind Tunnel Tests” SAE 810186 1981
- IS0/TC22/SC5/WG2 (Ann Arbor - 1979-3) N167E 1979
- Freas W. S. Task Force Correspondence 1978