THE EFFECT OF EXHAUST RECYCLE ON KNOCK_LIMITED SI ENGINE PERFORMANCE

This paper reports on some recent work performed to establish the effectiveness of exhaust gas recycle as a knock suppressant in spark ignition engines, and to determine the effect of fuel and engine operating conditions on knock-limited engine performance and NOX emissions. With ASTM 80 octane fuel, operating near stoichiometric, the higher knock-limited compression ratio (klcr)resulted in a break mean effective pressure (bmep) which was constant for moderate recycle, falling only with high recycle rates. Brake specific fuel consumption (bsfc) decreased with recycle to a minimum, and then increased for higher recycle rates. For lean mixtures, however, bsfc increased steadily with recycle. Performance was similar with the isoctane. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Hodges, J L
• Publication Date: 1975-2

Media Info

• Pagination: 7 p.

Subject/Index Terms

• TRT Terms: Compression; Engines; Exhaust gases; Fuel consumption; Fuels; Nitric oxide; Nitrogen oxides; Octane number; Performance; Recycling; Spark ignition engines; Testing
• Old TRIS Terms: Compression ratio; Octane rating
• Subject Areas: Energy; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00099532
• Record Type: Publication
• Report/Paper Numbers: SAE #750025
• Files: TRIS
• Created Date: Nov 5 1975 12:00AM