CYCLE BY CYCLE VARIABILITY IN EMISSIONS OF A SPARK IGNITION ENGINE

The exhaust emissions from a single-cylinder spark ignition engine were measured as a function of burning time. Tests were carried out at full throttle, for lean, optimum, and rich A/F. The exhaust components measured were CO, HC, 02, H2, N2 using a gas chromatograph. The emission most affected by CBCV is CO. Cycles that are either faster or slower than the mean cycle have increased CO, particularly at lean A/F where a five-fold difference in CO concentration was measured. HC emissions show a 150% change for the same conditions. A reduction in CBCV would also reduce overall CO and HC emissions, particularly for very lean operation. /GMRL/

  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • MILKINS, E E
    • WATSON, H C
    • Goldsworthy, L C
    • Hallworth, R J
  • Publication Date: 1974-10

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00096088
  • Record Type: Publication
  • Report/Paper Numbers: SAE Paper No. 741034
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM