This report is about emission measurements of two heavy duty road engines. They have been performed at reduced ambient temperatures. Turbocharged direct injected six in line cylinder diesel engines made by Volvo with a swept volume of 5.5 and 9.6 cubic decimeter were used. The tests were accomplished on engine transient test bed using mainly the US transient cycle. The achieved temperatures at start of the engines were around 10-15 degree Celcius. As references, ordinary test procedures according to US regulations were used, that is 12 hour cold soak at room temperature and engine start with engine temperature between 20 and 24 degree Celcius. Only standard regulated emissions were analysed and a limited number of test were done. The results are presented as total emissions in g/kWh per test cycle as well as integrated gaseous emissions in grams emitted during the first five minutes of each test cycle. The analysis of the results from the the test program indicate that even at these rather small temperature reductions compared to tests at start temperatures of 23 degree Celcius, the CO emissions are increased by 10-30% and hydrocarbon emissions may be far than doubled during the first five minutes of the test cycle. Increases of carbon dioxide, and particulates can also be measured, while the nitric oxide levels stays approximately unchanged. If cold starts at 10-15 degree Celsius are compared to starts with a warm engine instead, the CO emissions during the first five minutes of the test cycle may also be doubled.(A)

  • Availability:
  • Corporate Authors:

    AB Svensk Bilprovning Motortestcenter

    Box 223
    Haninge,   Sweden 
  • Authors:
    • HEDBOM, A
  • Publication Date: 1994


  • English

Media Info

  • Pagination: 28 p.
  • Serial:
    • Issue Number: 1994:11
    • Publisher: AB Svensk Bilprovning Motortestcenter
    • ISSN: 1103-0240

Subject/Index Terms

Filing Info

  • Accession Number: 00717889
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD
  • Created Date: Mar 20 1996 12:00AM