THE EFFECTS OF ENGINE VARIABLES AND EXHAUST GAS RECIRCULATION ON EMISSIONS, FUEL ECONOMY, AND KNOCK, PART 2

Steady-state data obtained from a 400 CID V-8 conventional engine at one speed/load/compression ratio combination are reported to show the effect of engine emission constraints on fuel consumption and octane number for trace knock. Various calibration combinations of air/fuel (A/F) ratio, exhaust gas recirculation (EGR), and spark retard can be used to control NO sub x emissions. When both HC (hydrocarbons) and NO sub x (nitrogen oxide) emissions were reduced by optimal adjustments of EGR and spark timing, fuel consumption was increased, but octane number for trace knock was decreased. Substantial reduction is engine emissions of HC and NO sub x was associated with a fuel consumption penalty and with a reduction in the octane number for trace knock measured under the emission test conditions. /GMRL/

  • Supplemental Notes:
    • From: Inter-Industry Emission Control Program 2..., SAE SP-403, February 1976, pp 27-34.
  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Morgan, C R
    • Hetrick, S S
  • Publication Date: 1976-2

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00139754
  • Record Type: Publication
  • Report/Paper Numbers: SAE #760198
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM