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A New Approach to Measuring Road Load by Chassis Dynamometer and Wind Tunnel Tests
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English
Abstract
Vehicle road load which must be simulated on a chassis dynamometer for exhaust emission and fuel economy tests is usually determined by on-road coastdown tests. In this study, we divided vehicle road load into rolling resistance and aerodynamic drag, and measured these forces in laboratory tests, using a high-precision chassis dynamometer and a full scale wind tunnel. However two problems arise. One of them is that tire loss measured on the curved drum of a chassis dynamometer is larger than on the road. Another is that aerodynamic drag measured in a closed-throat wind tunnel, which has blockage effects, is larger than on the road. To determine vehicle road load from laboratory tests, we therefore have to establish how to obtain a correction coefficient for tire loss between the actual road and the drum, and a correction coefficient for aerodynamic drag between the actual road and a wind tunnel. How we get these coefficients is described in this paper.
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Citation
Iwase, H., Yamada, S., and Koga, H., "A New Approach to Measuring Road Load by Chassis Dynamometer and Wind Tunnel Tests," SAE Technical Paper 820377, 1982, https://doi.org/10.4271/820377.Also In
References
- “Determination and Use of Alternative Dynamometer Power Absorption Values”
- Clark S.K. “Rolling Resistance Forces in Pneumatic Tires” University of Michigan Report: DOT-TSC-76-1
- DeRaad L.W. “The Influence of Road Surface Texture on Tire Rolling Resistance” SAE 780257
- Carr G.W. “Wind Tunnel Blockage Corrections for Road Vehicles” MIRA Report No.1971/4