PMID- 25976488
OWN - NLM
STAT- MEDLINE
DCOM- 20150929
LR  - 20150515
IS  - 1096-2247 (Print)
IS  - 1096-2247 (Linking)
VI  - 65
IP  - 6
DP  - 2015 Jun
TI  - Temperature effects on particulate emissions from DPF-equipped diesel trucks 
      operating on conventional and biodiesel fuels.
PG  - 751-8
LID - 10.1080/10962247.2014.984817 [doi]
AB  - Emissions tests were conducted on two medium heavy-duty diesel trucks equipped 
      with a particulate filter (DPF), with one vehicle using a NOx absorber and the 
      other a selective catalytic reduction (SCR) system for control of nitrogen oxides 
      (NOx). Both vehicles were tested with two different fuels (ultra-low-sulfur 
      diesel [ULSD] and biodiesel [B20]) and ambient temperatures (70 masculineF and 20 masculineF), 
      while the truck with the NOx absorber was also operated at two loads (a heavy 
      weight and a light weight). The test procedure included three driving cycles, a 
      cold start with low transients (CSLT), the federal heavy-duty urban dynamometer 
      driving schedule (UDDS), and a warm start with low transients (WSLT). Particulate 
      matter (PM) emissions were measured second-by-second using an Aethalometer for 
      black carbon (BC) concentrations and an engine exhaust particle sizer (EEPS) for 
      particle count measurements between 5.6 and 560 nm. The DPF/NOx absorber vehicle 
      experienced increased BC and particle number concentrations during cold starts 
      under cold ambient conditions, with concentrations two to three times higher than 
      under warm starts at higher ambient temperatures. The average particle count for 
      the UDDS showed an opposite trend, with an approximately 27% decrease when 
      ambient temperatures decreased from 70 masculineF to 20 masculineF. This vehicle experienced 
      decreased emissions when going from ULSD to B20. The DPF/SCR vehicle tested had 
      much lower emissions, with many of the BC and particle number measurements below 
      detectable limits. However, both vehicles did experience elevated emissions 
      caused by DPF regeneration. All regeneration events occurred during the UDDS 
      cycle. Slight increases in emissions were measured during the WSLT cycles after 
      the regeneration. However, the day after a regeneration occurred, both vehicles 
      showed significant increases in particle number and BC for the CSLT drive cycle, 
      with increases from 93 to 1380% for PM number emissions compared with tests 
      following a day with no regeneration. IMPLICATIONS: The use of diesel particulate 
      filters (DPFs) on trucks is becoming more common throughout the world. 
      Understanding how DPFs affect air pollution emissions under varying operating 
      conditions will be critical in implementing effective air quality standards. This 
      study evaluated particulate matter (PM) and black carbon (BC) emissions with two 
      DPF-equipped heavy-duty diesel trucks operating on conventional fuel and a 
      biodiesel fuel blend at varying ambient temperatures, loads, and drive cycles.
FAU - Book, Emily K
AU  - Book EK
AD  - a North Carolina State University, Mechanical and Aerospace Engineering , Raleigh 
      , NC , USA.
FAU - Snow, Richard
AU  - Snow R
FAU - Long, Thomas
AU  - Long T
FAU - Fang, Tiegang
AU  - Fang T
FAU - Baldauf, Richard
AU  - Baldauf R
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - United States
TA  - J Air Waste Manag Assoc
JT  - Journal of the Air & Waste Management Association (1995)
JID - 9503111
RN  - 0 (Air Pollutants)
RN  - 0 (Biofuels)
RN  - 0 (Gasoline)
RN  - 0 (Particulate Matter)
RN  - 0 (Vehicle Emissions)
SB  - IM
MH  - Air Pollutants/*analysis
MH  - Air Pollution/*prevention & control
MH  - Biofuels/analysis
MH  - *Environmental Monitoring
MH  - Environmental Restoration and Remediation
MH  - Gasoline/analysis
MH  - Particulate Matter/*analysis
MH  - *Temperature
MH  - Vehicle Emissions/*analysis
EDAT- 2015/05/16 06:00
MHDA- 2015/09/30 06:00
CRDT- 2015/05/16 06:00
PHST- 2015/05/16 06:00 [entrez]
PHST- 2015/05/16 06:00 [pubmed]
PHST- 2015/09/30 06:00 [medline]
AID - 10.1080/10962247.2014.984817 [doi]
PST - ppublish
SO  - J Air Waste Manag Assoc. 2015 Jun;65(6):751-8. doi: 10.1080/10962247.2014.984817.