DETERMINATION OF AIR FUEL RATIO FROM EXHAUST GAS ANALYSIS

There are, and will continue to be, increasing pressures to improve the efficiency and reduce toxic emissions of automotive internal combustion engines. These aims of better economy and lower emissions can be achieved by better control of the mixture strength at all operating conditions of such engines. The engine mixture strength, expressed as air fuel ratio A/F, could be either directly calculated from separate measurements of air and fuel mass flow rates, or indirectly deduced from an analysis of the exhaust gas stream. A large number of methods for determination of air fuel ratio from exhaust gas analysis are now in use on test beds, or in test vehicles, by establishments in the automotive industry. Some of these methods have been reviewed and compared by several researchers. In this paper a different approach to the problem is adopted. The reasons for discrepancies between various methods are first identified and the sensitivity of these methods to the errors from a variety of sources are assessed. Methods which are accepted to have sound physical and empirical bases are considered.

• Supplemental Notes:
  • ISATA 84, "In Pursuit of Technical Excellence". Proceedings Volume 1. International Symposium on Automotive Technology and Automation with particular reference to Vehicle Management Systems and Flexible Manufacturing Systems, Milan, Italy 24-28 September 1984.
• Corporate Authors:

  Automotive Automotion Limited

  42 Lloyd Park Avenue
  Croydon CRO 5SB, Surrey,   England 

  Alfa Romeo Auto SpA

  Milan,   Italy 
• Authors:
  • Qasrawi, AMS
• Conference:
  • ISATA 84, "In Pursuit of Technical Excellence". Proceedings Volume 1. International Symposium on Automotive Technology and Automation with particular reference to Vehicle Management Systems and Flexible Manufacturing Systems, Milan, Italy 24-28 September
• Publication Date: 1984

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 421-437

Subject/Index Terms

• TRT Terms: Alternatives analysis; Errors; Exhaust gases; Fuel air mixtures; Internal combustion engines; Measurement; Methodology
• Uncontrolled Terms: Air fuel ratio
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00399902
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: ISATA 84025, HS-038 443
• Files: HSL, USDOT
• Created Date: Oct 31 1985 12:00AM