Heavy-Duty Aerodynamic Testing for CO2 Certification: A Methodology Comparison
Published April 2, 2019 by SAE International in United States
Downloadable datasets for this paper availableAnnotation of this paper is available
Aerodynamic drag testing is a key component of the CO2 certification schemes for heavy-duty vehicles around the world. This paper presents and compares the regulatory approaches for measuring the drag coefficient of heavy-duty vehicles in Europe, which uses a constant-speed test, and in the United States and Canada, which use a coastdown test. Two European trucks and one North American truck were tested using the constant-speed and coastdown methods. When corrected to zero yaw angle, a difference of up to 12% was observed in the measured drag coefficients from the US coastdown procedure and the EU constant-speed test. The differences in the measured drag coefficient can be attributed, among others, to the assumptions in the speed-dependence of the tire rolling resistance and axle spin losses, the data post-processing required by each methodology, unaccounted frictional losses in the transmission, the behavior of the automated manual transmission during the coastdown run, and the yaw angle correction.
- J. Felipe Rodriguez - Intl. Council on Clean Transportation
- Oscar Delgado - Intl. Council on Clean Transportation
- Berk Demirgok - West Virginia University
- Cem Baki - West Virginia University
- Marc Besch - West Virginia University
- Arvind Thiruvengadam - West Virginia University
- Martin Rexeis - University of Technology Graz
- Martin Röck - University of Technology Graz
CitationRodriguez, J., Delgado, O., Demirgok, B., Baki, C. et al., "Heavy-Duty Aerodynamic Testing for CO2 Certification: A Methodology Comparison," SAE Technical Paper 2019-01-0649, 2019, https://doi.org/10.4271/2019-01-0649.
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