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/

Media Info

  • Pagination: 7 p.

Subject/Index Terms

Filing Info

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