This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Quantitative Estimate of the Relation Between Rolling Resistance on Fuel Consumption of Class 8 Tractor Trailers Using Both New and Retreaded Tires
Technical Paper
2014-01-2425
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Road tests of class 8 tractor trailers were conducted by the US Environmental Protection Agency (EPA) on a new and retreaded tires of varying rolling resistance in order to provide estimates of the quantitative relation between rolling resistance and fuel consumption. Reductions in fuel consumption were measured using the SAE J1231 (reaffirmation of 1986) test method. Vehicle rolling resistance was calculated as a load-weighted average of the rolling resistance (as measured by ISO28580) of the tires in each axle position. Both new and retreaded tires were tested in different combinations to obtain a range of vehicle coefficient of rolling resistance from a baseline of 7.7 kg/ton to 5.3 kg/ton. Reductions in fuel consumption displayed a strong linear relationship with coefficient of rolling resistance, with a maximum reduction of fuel consumption of 10 percent relative to the baseline. The return factor for the new tires was 1: 3.1, that is, a one percent decrease in fuel consumption is obtained by a 3.1 percent decrease in rolling resistance. These results are consistent with earlier studies conducted in the 1980s despite the numerous changes in truck design made since that time. Equipping a tractor with low rolling resistance tires provided 7.4 percent of the reduction of fuel consumption, even when baseline tires were used on the trailer. Retreaded tires provided a lower reduction in fuel consumption, with a return factor of 1:4. Retesting of both new and retreaded tires provided reductions in fuel consumption of 7.3 to 7.6 percent suggesting that the first test result may have been an anomaly. The results demonstrate the value of conducting multiple SAE J1321 tests to evaluate variability in on-road testing.
The relationships derived from the tests approximate what would be expected based on mathematical models. These results can be used to estimate reductions in fuel consumption and emissions from tires without additional road testing, and they can be used to characterize potential benefits using vehicle models of fuel consumption and emissions.
Recommended Content
Authors
Topic
Citation
Bachman, L., Erb, A., and Sellers, J., "Quantitative Estimate of the Relation Between Rolling Resistance on Fuel Consumption of Class 8 Tractor Trailers Using Both New and Retreaded Tires," SAE Technical Paper 2014-01-2425, 2014, https://doi.org/10.4271/2014-01-2425.Also In
References
- U.S. Department of Energy Technology Roadmap for the 21 st Century Truck Program: A Government-Research Partnership Report 21CT-001 Office of Heavy Vehicle Technologies 2000
- Schuring , D.J. , and Futamura , S. Rolling Loss of Pneumatic Highway Tires in the Eighties Rubber Chemistry and Technology 63 315 367 1990
- LaClair , T. and Truemner , R. Modeling of Fuel Consumption for Heavy-Duty Trucks and the Impact of Tire Rolling Resistance SAE Technical Paper 2005-01-3550 2005 10.4271/2005-01-3550
- Bachman , L. , Erb , A. , and Bynum , C. Effect of Single Wide Tires and Trailer Aerodynamics on Fuel Economy and NOx Emissions of Class 8 Line-Haul Tractor-Trailers SAE Technical Paper 2005-01-3551 2005 10.4271/2005-01-3551
- Bachman , L. , Erb , A. , Bynum , C. , Shoffner , B. et al. Fuel Economy Improvements and NOx Reduction by Reduction of Parasitic Losses: Effect of Engine Design SAE Technical Paper 2006-01-3474 2006 10.4271/2006-01-3474
- United States National Archives and Records Administration Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and heavy-Duty Engines and Vehicles Federal Register 76 179 57106 2011
- United States Environmental Protection Agency Greenhouse Gas Emissions Model (GEM) User Guide 2011
- http://www.epa.gov/smartway/forpartners/documents/verified/retread-perform-req.pdf Jun 20 2014