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.

• Record URL:
  https://doi.org/10.4271/2019-01-0649
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Rodriguez, J
  • Delgado, Oscar
  • Demirgok, Berk
  • Baki, Cem
  • Besch , Marc
  • Thiruvengadam, Arvind
  • Rexeis, Martin
  • Röck, Martin
• 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;
• 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