On-board measurement of particle numbers and their size distribution from a light-duty diesel vehicle: Influences of VSP and altitude

Jia Liu, Yunshan Ge, Xin Wang*, Lijun Hao, Jianwei Tan, Zihang Peng, Chuanzhen Zhang, Huiming Gong, Ying Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

In this study, the particle size-resolved distribution from a China-3 certificated light-duty diesel vehicle was measured by using a portable emission measurement system (PEMS). In order to examine the influences of vehicle specific power (VSP) and high-altitude operation, measurements were conducted at 8 constant speeds, which ranged from 10 to 80 km/hr at 10 km/hr intervals, and two different high altitudes, namely 2200 and 3200 m. The results demonstrated that the numbers of particles in all size ranges decreased significantly as VSP increased when the test vehicle was running at lower speeds (< 20 km/hr), while at a moderate speed (between 30 and 60 km/hr), the particle number was statistically insensitive to increase VSP. Under high-speed cruising conditions, the numbers of ultrafine particles and PM2.5 were insensitive to changes in VSP, but the numbers of nanoparticles and PM10 surged considerably. An increase in the operational altitude of the test vehicle resulted in increased particle number emissions at low and high driving speeds; however, particle numbers obtained at moderate speeds decreased as altitude rose. When the test vehicle was running at moderate speeds, particle numbers measured at the two altitudes were very close, except for comparatively higher number concentrations of nanoparticles measured at 2200 m.

Original languageEnglish
Pages (from-to)238-248
Number of pages11
JournalJournal of Environmental Sciences (China)
Volume57
DOIs
Publication statusPublished - Jul 2017

Keywords

  • Diesel
  • High altitude
  • On-board measurement
  • Particle number
  • Size distribution
  • VSP

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