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Title Effect of B20 and low aromatic diesel on transit bus NOx emissions over driving cycles with a range of kinetic intensity / Michael P. Lammert ... [and others].
Imprint [Warrendale, PA] : SAE International ; [Golden, Colo. :] : [National Renewable Energy Laboratory], [2012]

Series NREL/CP ; 5400-55672
Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP 5400-55672.
Subject Buses -- Motors (Diesel) -- Exhaust gas -- Analysis.
Biodiesel fuels -- Analysis.
Diesel motor exhaust gas -- Analysis.
Nitrogen oxides.
Air -- Pollution.
Alt Name Lammert, Michael Dean, 1949-
National Renewable Energy Laboratory (U.S.)
Commercial Vehicle Engineering Congress and Exhibition (2012 : Rosemont, Ill.)
Description 1 online resource (15 pages) : color illustrations.
Note Title from PDF title screen (viewed on Dec. 11, 2012).
"Published 09/24/2012."
"Presented at the SAE 2012 Commercial Vehicle Engineering Congress."
Summary Oxides of nitrogen (NOx) emissions for transit buses for up to five different fuels and three standard transit duty cycles were compared to establish whether there is a real-world biodiesel NOx increase for transit bus duty cycles and engine calibrations. Six buses representing the majority of the current national transit fleet and including hybrid and selective catalyst reduction systems were tested on a heavy-duty chassis dynamometer with certification diesel, certification B20 blend, low aromatic (California Air Resources Board) diesel, low aromatic B20 blend, and B100 fuels over the Manhattan, Orange County and UDDS test cycles. Engine emissions certification level had the dominant effect on NOx; kinetic intensity was the secondary driving factor. The biodiesel effect on NOx emissions was not statistically significant for most buses and duty cycles for blends with certification diesel, except for a 2008 model year bus. CARB fuel had many more instances of a statistically significant effect of reducing NOx. SCR systems proved effective at reducing NOx to near the detection limit on all duty cycles and fuels, including B100. While offering a fuel economy benefit, a hybrid system significantly increased NOx emissions over a same year bus with a conventional drivetrain and the same engine.
Bibliography Note Includes bibliographical references (p. 9).
OCLC # 820886745