THE ART OF CHOOSING A MODEL

Information to be gained using an air-standard model of an engine is discussed as well as the thermodynamic inconsistencies of the model. A number of useful trends arrived at by use of a time-independent fuel-air model are presented. The thermodynamic rate model, made possible by the advent of high speed computers, provides a great deal more insight on engine behavior than the fuel-air model but still has serious deficiencies. Progress towards expanding the thermodynamic rate model to include transient operation, multidimensions and Second Law analysis is discussed. Lack of experimental data on which to base sound models is progress limiting for the first two; obtaining these data should be given high priority. Second Law analysis is of potential help in understanding losses and improving fuel economy.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • International Congress and Exposition, Detroit, Michigan, February 25-March 1, 1985. Reprinted from P-156, Engine Combustion Analysis: New Approaches.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Myers, P
• Publication Date: 1985-2

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1-14
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Engine performance; Engines; Fuel air mixtures; Fuel conservation; Mathematical models; Thermodynamics; Transient analyzers
• Uncontrolled Terms: Air fuel ratio; Transient response
• Old TRIS Terms: High speed computers
• Subject Areas: Energy; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00452378
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 850341 Reprint, HS-039 392
• Files: HSL, USDOT
• Created Date: Jan 31 1986 12:00AM