THE EFFECT OF ACCELERATION RATE ON AUTOMATIC TRANSMISSION SHIFT-SPEEDS FOR TWO 1979 NOVAS

Variations in acceleration rates will result in variations in vehicle fuel economy. If typical vehicle acceleration rates are distributed in the same manner as the accelerations are distributed on the EPA test cycles, or if the vehicle operational characteristics do not significantly change with acceleration rate, then results from the EPA cycles should be representative of average vehicle use. However, if vehicle operational characteristics change with changing acceleration rates, and if vehicle accelerations in consumer use are not distributed in the same manner as the accelerations of the EPA test cycle, then significant differences between EPA estimated fuel economy and actual vehicle fuel consumption may result. One vehicle characteristic which often changes with acceleration rate is the transmission shift speed for vehicles with automatic transmissions. To determine the effects of acceleration rates on transmission shift speeds, EPA recently conducted a short test sequence on two vehicles with automatic transmissions. These tests determined the relation between vehicle acceleration rate and transmission shift speed for acceleration rates from 1 to 6 mph/sec.

  • Corporate Authors:

    Environmental Protection Agency

    Standards Development & Support Branch, 2565 Plymouth Road
    Ann Arbor, MI  United States  48105
  • Authors:
    • Jones, R
  • Publication Date: 1980-1

Media Info

  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318727
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA-AA-SDSB-80-3 Tech Rpt.
  • Files: TRIS
  • Created Date: Oct 27 1981 12:00AM