Although studies of alternative propulsion systems were initiated by the introduction of stringent emission standards in the USA and elsewhere, solutions have been found by development of the spark ignition engine itself. The author briefly reviews a number of these developments aimed at reducing fuel consumption and control of exhaust emissions. Such developments require precise electronic mixture control by an oxygen probe combined with exhaust gas treatment in a three-way catalytic reactor. This system is able to reduce nitrogen oxide to nitrogen and oxygen, and also to oxidise unburned hydrocarbons and carbon monoxide. The air/fuel mixture has to be regulated within narrow limits and the use of a catalytic material requires lead-free fuel with consequently lower thermal efficiency due to reduced compression ratio. The efficiency of spark-ignition engines is compared to diesel engines for car use and methods of increasing part-load efficiency discussed. (TRRL)

  • Availability:
  • Supplemental Notes:
    • Adapted from lecture presented to International Automobile Fuel Economy Research Conference (1st), Arlington, Virginia, 1 November 1979, and to Institution of Mechanical Engineers, Automobile Division, London, 3 March 1980.
  • Corporate Authors:

    Mechanical Engineering Publications Limited

    P.O. Box 24, Northgate Avenue
    Bury St Edmunds, Suffolk IP32 6BW,   England 
  • Authors:
    • Forster, H
  • Publication Date: 1980-4-5

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 23-26
  • Serial:
    • Volume: 5
    • Issue Number: 2
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00325939
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: HS-029 210
  • Files: HSL, ITRD, TRIS
  • Created Date: Apr 15 1984 12:00AM