REDUCING NOX EMISSIONS

The article examines design changes on air pollution control equipment introduced on Japanese car engines to meet 1978 regulations. From March 1978 Japanese emission regulations limited CO to 2.1 g/km, HC to 0.25 g/km and NOx to 0.25 g/km. The emission levels are designed to reduce health hazards in conditions of extreme city centre traffic congestion. To meet the emission requirements the Honda CVCC engine has auxiliary chamber modifications to obtain complete combustion and now operates on an air: fuel ratio in the main chamber of 22-23:1. The Nissan fast burn engine incorporates dual-sparking plugs and operates at an air fuel ratio of 14.5:1 with a limit of 33% egr (exhaust gas recirculation). These developments and also those by Mitsubishi and Toyota show that reasonable fuel consumption can be obtained at relatively low emission levels - by European standards - without a catalyst. /TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Mechanical Engineers

    1 Birdcage Walk
    London SW1H 9JJ,   England 
  • Authors:
    • Hartley, J
  • Publication Date: 1978-8-9

Media Info

  • Features: Figures;
  • Pagination: p. 68-70
  • Serial:
    • AUTOMOTIVE ENGINEER
    • Volume: 3
    • Issue Number: 4
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00184546
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 3 1979 12:00AM