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.

Media Info

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

Subject/Index Terms

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