Heavy-Duty Aerodynamic Testing for CO2 Certification: A Methodology Comparison
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.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
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Supplemental Notes:
- Abstract reprinted with permission of SAE International.
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Authors:
- Rodriguez, J
- Delgado, Oscar
- Demirgok, Berk
- Baki, Cem
- Besch , Marc
- Thiruvengadam, Arvind
- Rexeis, Martin
- Röck, Martin
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Conference:
- WCX SAE World Congress Experience
- Location: Detroit Michigan, United States
- Date: 2019-4-9 to 2019-4-11
- Publication Date: 2019-4-2
Language
- English
Media Info
- Media Type: Web
- Features: References;
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Serial:
- SAE Technical Paper
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Aerodynamics; Axles; Carbon dioxide; Certification; Drag; Manual transmissions; Transmissions; Trucks; Yaw
- Subject Areas: Environment; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01703075
- Record Type: Publication
- Source Agency: SAE International
- Report/Paper Numbers: 2019-01-0649
- Files: TRIS, SAE
- Created Date: Apr 26 2019 11:29AM