EVALUATION OF BURNED GAS RATIO (BGR) AS A PREDOMINANT FACTOR TO NOX

Experiments were conducted with four cylinder production engines to evaluate the effect of EGR and mixture stoichiometry on NOx by measuring the burned gas ratio in the cylinder (BGR) by using a gas sampling valve and CO//2 gas analyzer. The total gas fuel ratio (G/F) in the cylinder, which is a function of air-fuel ratio (A/F) and BGR and is some measure of adiabatic combustion peak temperature of charge, was introduced as a new measure to evaluate the combustion in the cylinder. G/F ratio coupled with A/F could be utilized to evaluate the combustion characteristics such as NOx emission, misfire limit, etc. in various combustion chamber configurations. NOx emission and misfire limit are strongly affected by the BGR in the cylinder. Stoichiometrically burned gas EGR has the best potential to reduce NOx together with power for a fixed engine displacement, but from the point of view of fuel economy and misfire limit indicated by G/F, its mixture is the second to leanest A/F, when the critical constraint of NOx and better fuel economy were considered.

  • Supplemental Notes:
    • Presented at SAE Meeting, October 18-22, 1976.
  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Toda, T
    • Nohira, H
    • Kobashi, K
  • Publication Date: 1976

Media Info

  • Features: References;
  • Pagination: 13 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00159690
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 760765 Preprint
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM