CLEAN AIR SNAGS SOLVED BY STRATIFIED CHARGE

Volkswagen's biggest export market is in the United States; and because of this, a large proportion of its research department's work is aimed at solving problems of safety and exhaust emission in order to meet U.S. Regulations. The main emphasis has thus been on the development of a low emission engine; and the author discusses the VW stratified charge programme, which has led to the production of a stratified charge unit, based on precombustion injection - PCI. A compromise was found necessary in the design of the precombustion chamber to cater for both low emission levels and economy. The emission characteristics of the engine are given as being inherently low in carbon monoxide, low on nitrous oxides-the reason the engine has been developed- but not especially low on hydrocarbons. The levels quoted are 0.6-0.9 g/mile hydrocarbons, 3-6 g/mile carbon monoxide, and 1.2-1.6 g/mile nitrous oxides, which are low enough to meet California standards without catalysts. The complication and expense of the PCI engine lies almost totally in the fuel system-two fuel delivery systems are needed, and as such it is felt to be too costly for the European market with its present emission levels. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Publication Date: 1976-3

Media Info

  • Features: Photos;
  • Pagination: p. 28-29
  • Serial:
    • ENGINEER
    • Volume: 242
    • Issue Number: 6261
    • Publisher: Morgan-Grampian Limited
    • ISSN: 0013-7758

Subject/Index Terms

Filing Info

  • Accession Number: 00137730
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 13 1977 12:00AM