Details are given of a report issued by General Motors which discusses the various devices under consideration by the company to meet the requirements of the proposed 1975 and 1976 U.S. Federal Emission Standards which call for approximately 90% reductions in emissions below 1970 levels. Possible approaches include improved ignition and fuel injection systems to increase reliability and performance, and reduce emissions, and the use of lead-free fuel to reduce particulate matter in exhaust products. To meet the proposed 1975 standards a catalytic converter to reduce hydrocarbons & carbon monoxide to water & carbon dioxide, would be very effective once the catalyst is warm (usually within 2 minutes of starting the engine). An air injection pump would supply the additional air required. A possible alternative is a thermal reactor but this has problems of size, high working temperature and fuel consumption. The control of oxides of nitrogen, required by the 1976 standards, is a more serious problem. The two chief methods are to lower compression ratios, which General Motors did in 1971, and to reduce the combustion temperature by injection of water or cooled exhaust gas. This has side effects including higher fuel consumption. Catalytic converters, to change the oxides to nitrogen & oxygen are being considered but all catalysts known at present result in some ammonia production.

  • Corporate Authors:

    Design Engineering Publications Limited

    89 Blackfriars Road
    London SE1,   England 
  • Authors:
    • Janicki, E
  • Publication Date: 1973-10

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00260775
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 20 1974 12:00AM