A detailed simulation of a turbocharged spark-ignition engine is presented. The model is based on the "control volume" concept, yet includes pressure wave action effects in manifold pipes. Each cylinder is considered as a thermodynamic control volume. Manifolds are considered as pipes bounded by volumes (which may be small enough to represent pipe junctions). The program is of modular form, hence any number of cylinders may be specified, along with pipes, turbocharger, waste-gate, EGR system and throttle in almost any arrangement. Energy mass flow and gas dynamic equations are solved in a quasi-steady manner at 1 deg crank angle steps. The accuracy of the simulation is illustrated over a wide range of speed and load, by comparison with detailed test results, from an Audi 200T engine. The utility of the model is shown by predicting the effect of design changes aimed at improving low engine speed boost pressure and turbocharger response, plus boost control at higher speeds.

  • Supplemental Notes:
    • Twentieth FISITA Congress, (SAE P-143), The Automotive Future, Volume 2, Austria, 6-11 May 1984.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Watson, N
  • Publication Date: 1984-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00392484
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 845042, HS-037 440
  • Files: HSL, USDOT
  • Created Date: Feb 28 1985 12:00AM