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

• TRT Terms: Combustion; Cylinder heads; Exhaust gases; Testing; Time; Vehicle power plants
• Old TRIS Terms: Automobile engines; Time factor
• Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

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