STUDY OF MODELS FOR THE PREDICTION OF AVERAGE ROAD LOAD OF IN-USE DELIVERY TRUCKS

Coast-down studies of Class 6 trucks were conducted at near-zero road grade and wind conditions. Speed-versus-time data were recorded, smoothed to a quadratic equation to calculate deceleration rates, and reduced by the least-square method using two-, three-, and five-parameter linear models. The estimated parameters were analyzed statistically and compared to the U. S. Environmental Protection Agency (EPA) recommended procedure. The averages of the individual truck road loads for the three models were consistent within 4% when reference conditions of 40 mi/h, 15,000 lb weight, and 65 sq ft projected frontal area were used. These reference conditions represent the median values of experiment conditions that were varied during coast-down tests. At these conditions, road load variations among the trucks averaged 10% and 16% for the two- and five-parameter models, respectively. The coefficients of the five-parameter model displayed instability during sequential estimation, showing multicollinearity. Because of this instability and the significance of the truck-to-truck variations, the two-parameter model seemed most appropriate for predicting the truck road load. At reference conditions, the two-parameter model road load was 10% greater than that from the EPA recommended procedure.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Truck and Bus Meeting and Exposition Cleveland, Ohio, November 7-10, 1983.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Cha, S
  • Sloan, R L
  • Black, F M
• Publication Date: 1983

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 17 p.
• 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: Forecasting; Friction; Mathematical models; Trucks
• Uncontrolled Terms: Models
• Old TRIS Terms: Driving resistance; Friction forces; Road load
• Subject Areas: Motor Carriers; Safety and Human Factors;

Filing Info

• Accession Number: 00381955
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 831799, HS-036 099
• Files: HSL, USDOT
• Created Date: Mar 30 1984 12:00AM