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Title: Studies of diesel engine particle emissions during transient operations using an Engine Exhaust Particle Sizer

Journal Article · · Aerosol Science & Technology
 [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. ORNL
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Diesel engine particle emissions during transient operations, includingemissions during FTP transient cycles and during activeregenerations of a NOx adsorber, were studied using a fast EngineExhaust Particle Sizer (EEPS). For both fuels tested, a No. 2 certificationdiesel and a low sulfur diesel (BP-15), high particle concentrationsand emission rates were mainly associated with heavyengine acceleration, high speed, and high torque during transientcycles. Averaged over the FTP transient cycle, the particle numberconcentration during tests with the certification fuel was 1.2e8/cm3,about four times the particle number concentration observed duringtests using the BP-15 fuel. The effect of each engine parameteron particle emissions was studied. During tests using BP-15, theparticle number emission rate was mainly controlled by the enginespeed and torque, whereas for Certification fuel, the engineacceleration also had a strong effect on number emission rates.The effects of active regenerations of a diesel NOx adsorber onparticle emissions were also characterized for two catalyst regenerationstrategies: Delayed Extended Main (DEM) and Post 80 injection(Post80). Particle volume concentrations observed duringDEM regenerations were much higher than those during Post80 regenerations, and the minimum air to fuel ratio achieved duringthe regenerations had little effect on particle emission for bothstrategies. This study provides valuable information for developingstrategies that minimize the particle formation during activeregenerations of NOx adsorbers.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
930752
Journal Information:
Aerosol Science & Technology, Vol. 40, Issue 11; ISSN 0278-6826
Country of Publication:
United States
Language:
English

References (12)

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Investigation of Ultrafine Particle Formation during Diesel Exhaust Dilution journal November 1999
The sources of polycyclic aromatic compounds in diesel engine emissions☆ journal March 2003
Electrical aerosol spectrometer of Tartu University journal June 2002
Comparison of sequential and parallel measurementprinciples in aerosol spectrometry journal January 1991
Number size distribution of particulate emissions of heavy-duty engines in real world test cycles journal December 2003
Scanning Electrical Mobility Spectrometer journal January 1990
Fast Mixing Condensation Nucleus Counter: Application to Rapid Scanning Differential Mobility Analyzer Measurements journal June 2002
A Fast Scanning Mobility Particle Spectrometer for Monitoring Transient Particle Size Distributions journal June 2005
Ultrafine PM Emissions from Natural Gas, Oxidation-Catalyst Diesel, and Particle-Trap Diesel Heavy-Duty Transit Buses journal December 2002
Uncertainty in Particle Number Modal Analysis during Transient Operation of Compressed Natural Gas, Diesel, and Trap-Equipped Diesel Transit Buses journal April 2004
Survival of Polycyclic Aromatic Hydrocarbons during Diesel Combustion journal November 1995

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33 ADVANCED PROPULSION SYSTEMS
AIR
CATALYSTS
DIESEL ENGINES
ENGINES
REGENERATION
SULFUR
TORQUE
TRANSIENTS
PARTICLE SIZE
PARTICLE SIZE CLASSIFIERS
aerosol
diesel particle