EVALUATION OF FUEL CONSUMPTION RATES AND THERMAL EFFICIENCY OF AUTOMOBILES BY APPLICATION OF FURNACE ANALYSIS

Analysis of automobile fuel consumption data reported by COPE (1973) has shown that behavior obeys a simple relation between fuel consumption rate (in gal/hr/) and speed (in m.p.h.) for all vehicles tested, with and without air conditioning, with vehicles differentiated by different experimental values of three equation constants: an intrinsic efficiency parameter, a theoretical maximum velocity, and the idle consumption. These parameters determine the optimum speed for the best m.p.g. The results show that the optimum speed increases with idle losses; however, the proportional efficiency also falls. The effect of some other factors can also be identified in the equations and parameter values: air conditioning, for example, can have a large effect on a small engine or on a highly tuned engine in a light weight car, but quite minor effect on a large engine in a heavy car. Implications for the future are also discussed. /Author/TRRL/

  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Essenhigh, R H
  • Publication Date: 1974-10

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 457-464
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095852
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 2 1975 12:00AM