TIRE-DYNAMOMETER ROLL EFFECTS
The Federal Government currently determines light-duty vehicle fuel economy and emissions on the twin small-roll dynamometer. The geometry of the dynamometer-vehicle system is one which cannot be duplicated under actual driving conditions because only the rear tires are placed on the dynamometer and the surface upon which they are placed is curved. Recently, questions have been raised as to the validity of the assumption that two tires on the dynamometer equals four tires on the road with regard to all tire construction types. However, it has been suggested that when radial tires are operated on the twin small-roll dynamometer they exhibit higher rolling resistance than the other construction types under the same conditions. Lack of information prompted an in-house investigation into the effects of the twin-small-roll dynamometer on tires.
Environmental Protection AgencyStandards Development & Support Branch, 2565 Plymouth Road
Ann Arbor, MI United States 48105
- Burgeson, R N
- Publication Date: 1978-3
- Pagination: 69 p.
- TRT Terms: Aerodynamic force; Analysis of variance; Automobiles; Data collection; Dynamometers; Exhaust gases; Fuel consumption; Live loads; Performance tests; Rolling; Rolling contact; Rolling friction; Tires; Validity
- Old TRIS Terms: Resistance
- Subject Areas: Data and Information Technology; Energy; Highways; Vehicles and Equipment; I95: Vehicle Inspection;
- Accession Number: 00313514
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: EPA-AA-LDTP-77-4 Tech Rpt.
- Files: TRIS
- Created Date: Jun 26 1980 12:00AM