Impacts of Exhaust Transfer System Contamination on Particulate Matter Measurements

Jiacheng Yang, Liem Pham, Kent C. Johnson, Thomas D. Durbin, Georgios Karavalakis, David Kittelson, Heejung Jung

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

As the measurement of low levels of particulate matter (PM) and solid particulate number (PN) from light-duty vehicles becomes more critical, it is becoming more important to understand the potential impacts of exhaust transfer system contamination. This phenomenon occurs when, as it relates to vehicle emission testing, particles deposit and semi-volatile materials are adsorb onto the inner surfaces of the exhaust transfer system, which includes the vehicle exhaust pipe, the exhaust transfer line, and the constant volume sampling (CVS) system, and may subsequently re-entrain and desorb in subsequent vehicle tests. A soot loading cycle was successfully developed and resulted in 36 to 8600 mg of PM mass passing through the CVS tunnel. The results from cleaning tests suggested that majority of particles released during the cleaning tests are semi-volatiles with little presence of soot. A series of chassis dynamometer tests were conducted to characterize the differences between “clean” and “contaminated” sampling system and their impact on low level PM measurements. The results from this study show no measurable PM mass impacts between the “dirty” and clean tunnel conditions that were observed until after a high emitter was tested (80–120 mg/mi diesel vehicle). [Figure not available: see fulltext.].

Original languageEnglish (US)
Pages (from-to)163-177
Number of pages15
JournalEmission Control Science and Technology
Volume6
Issue number2
DOIs
StatePublished - Jun 1 2020

Bibliographical note

Funding Information:
We received funding from the Coordinating Research Council (Project E-99-2).

Funding Information:
The authors thank the following organizations and individuals for their valuable contributions to this project. We acknowledge Mr. Mark Villela and Mr. Daniel Gomez of the University of California, Riverside for their contributions in conducting the emissions testing for this program. The authors also acknowledge the help of the E-99-2 project advisory panel, including Mr. Don Nagy from General Motors, Dr. Mahmoud Yassine from Fiat Chrysler Automobiles, and Dr. Matti Maricq from Ford Motors.

Publisher Copyright:
© 2020, Springer Nature Switzerland AG.

Keywords

  • Emission control
  • Particle emission
  • Particle measurements
  • Vehicle emission

Fingerprint

Dive into the research topics of 'Impacts of Exhaust Transfer System Contamination on Particulate Matter Measurements'. Together they form a unique fingerprint.

Cite this