A program for computing continuously the instantaneous fuel consumption and emissions of passenger cars has been constructed. The program includes the modeling of the dynamic interactions within the powerplant and chassis, making it possible to investigate transient effects that are masked with simulation models based on the assumption of operation at a series of steady-state conditions. An all-digital batch version is used for fast evaluation of changes in fuel economy, emissions, etc., caused by vehicle component changes. A real-time hybrid computer version, in combination with a "driver compartment simulator", allows drivability and other human factors to be evaluated, and is particularly useful in the study of advanced and unorthodox concepts. Good results have been obtained in the prediction of fuel consumption over various driving cycles, in determining changes in fuel consumption from changes in vehicle component parameters, and in studying power train dynamics. The program keeps a running account throughout the driving cycle of where the energy from the prime mover goes, i.e., how much is lost in each component of the drive train, in rolling resistance, in aerodynamic drag, how much is thrown away in braking, etc. Another feature found very useful is a joint probability density print-out for the engine. This allows one to determine the fraction of time spent at each torque-speed condition over a driving cycle.

  • Supplemental Notes:
    • Sponsored by the Department of Transportation. Proceedings of the Intersociety Energy Conversion Engineering Conference, 10th August, 1975, Newark, Delaware.
  • Corporate Authors:

    University of Wisconsin, Madison

    Department of Civil and Environmental Engineering
    1415 Engineering Drive
    Madison, WI  United States  53706

    Shell Development Compnay

    Wood River, IL  United States 
  • Authors:
    • Radtke, R
    • Kapellen, D
    • FRANK, A
    • Beachley, N
  • Publication Date: 1975

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00134732
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Contract Numbers: DOT-OS-30112
  • Files: TRIS
  • Created Date: Jul 22 1976 12:00AM