Cold temperature PM emissions measurement

Method evaluation and application to light duty vehicles

Jyrki Ristimäki, Jorma Keskinen, Annele Virtanen, Matti Maricq, Päivi Aakko

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

This work examines the methodology to sample and measure the number and size of motor vehicle particulate emissions (PM) at subambient temperatures. The study has two principal objectives. The first is to address the following question: which aspects of the particle sampling, dilution, and size measurement process must be made at the vehicle test temperature to obtain an accurate representation of the PM emissions? The second is to perform a preliminary overview of how subambient temperature operation affects PM emissions from the major classes of current model light duty vehicles. The principal findings are the following: (1) The temperature of the particle size instruments, test cell versus room temperature, has little effect on the measurements. (2) Once the engine has warmed, solid particle (soot) mode emissions in the cold test cell are similar to those at room temperature. The first finding simplifies cold temperature emissions testing because it allows particle sizing instruments to be placed outside the cold test cell and operated at room temperature. The latter is consistent with the expectation that solid particles are formed in the engine and are therefore relatively unaffected by ambient conditions after engine warm-up. Use of cold dilution air in the room-temperature test cell increases the number and size of nuclei particles; however, the effect of dilution air temperature was inconclusive in the cold test cell.

Original languageEnglish
Pages (from-to)9424-9430
Number of pages7
JournalEnvironmental Science & Technology
Volume39
Issue number24
DOIs
Publication statusPublished - 15 Dec 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

measurement method
temperature
Temperature
engine
Dilution
dilution
Engines
cold
evaluation
vehicle
Soot
Particulate emissions
soot
Air
test
air temperature
particle size
Particle size
Sampling
methodology

Keywords

  • nanoparticles
  • particle emissions
  • fine particles
  • emission
  • low temperatures

Cite this

Ristimäki, Jyrki ; Keskinen, Jorma ; Virtanen, Annele ; Maricq, Matti ; Aakko, Päivi. / Cold temperature PM emissions measurement : Method evaluation and application to light duty vehicles. In: Environmental Science & Technology. 2005 ; Vol. 39, No. 24. pp. 9424-9430.
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Cold temperature PM emissions measurement : Method evaluation and application to light duty vehicles. / Ristimäki, Jyrki; Keskinen, Jorma; Virtanen, Annele; Maricq, Matti; Aakko, Päivi.

In: Environmental Science & Technology, Vol. 39, No. 24, 15.12.2005, p. 9424-9430.

Research output: Contribution to journalArticleScientificpeer-review

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