EMISSION AND FUEL ECONOMY SENSITIVITY TO CHANGES IN LIGHT DUTY VEHICLE TEST PROCEDURES

This report describes the laboratory and statistical results of Task Number 10. Five light duty vehicles present and projected vehicle populations and emission control systems were used to investigate emission and fuel economy sensitivity to changes in current test procedures for light duty vehicles. The length of soak period preceding the EPA Urban Dynamometer Driving Schedule (UDDS), and the speed versus time characteristics of the UDDS and EPA Highway Fuel Economy Test (FET) were varied. A 't' test was used to test for significant differences between baseline results and results obtained with modified driving cycles. Means, standard deviations, and coefficients of variation were calculated for groups of tests for each particular vehicle at each test condition.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  USA  78228-0510

    Environmental Protection Agency

    Emission Control Technology Division, 2565 Plymounth Road
    Ann Arbor, MI  USA  48105
  • Authors:
    • Srubar, R L
  • Publication Date: 1977-5

Media Info

  • Pagination: 252 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00176150
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA-460-3-77-024 Final Rpt.
  • Contract Numbers: EPA-68-03-2196
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM