@Article{fdmp.2022.019311,
AUTHOR = {Jinliang Zhu, Xiulei Wang, Guihua Wang, Xianglin Zhong, Zhenguo Li, Zhiming Wang, Ke Sun, Shuzhan Bai},
TITLE = {Experimental Analysis of the Influence of Exhaust Thermal Management on Engine NO<sub>x</sub> Emission},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {18},
YEAR = {2022},
NUMBER = {3},
PAGES = {701--711},
URL = {http://www.techscience.com/fdmp/v18n3/46807},
ISSN = {1555-2578},
ABSTRACT = {Exhaust thermal management is essential to allow engines to meet the Euro VI emissions standards and reducing
nitrogen oxide emissions is one of the most important targets being pursued nowadays. Along these lines, in the
present study, engine’s thermal performances have been evaluated on the basis of a WHTC test, namely a transient engine dynamometer schedule defined by the global technical regulation (GTR) developed by the UN ECE
GRPE group (the GTR is covering a world-wide harmonized heavy-duty certification (WHDC) procedure for
engine exhaust emissions). The influence of thermal management on fuel consumption, intake, and tailpipe
NO<sub>x</sub> have been quantitatively analyzed for the overrun state. The results have shown that there can be a strong
influence on the after-treatment temperatures and tailpipe NO<sub>x</sub>. In particular, the average temperature upstream
of the diesel oxidation catalyst (DOC) has been found to increase from 245°C to 254°C, the average temperature
of the selective catalytic reduction (SCR) to increase from 248°C to 253°C, the SCR’s minimum temperature to
increase from 196°C to 204°C, and the peak value of the NO<sub>x</sub> emissions in the low-temperature region to decrease
from 73 to 51 mg/s. However, the influence of the overrun state’s thermal management strategy on the fuel consumption, the air intake, the ammonia storage, the NO<sub>2</sub>/NO<sub>x</sub> ratio, and the urea consumption has been observed
to be relatively limited.},
DOI = {10.32604/fdmp.2022.019311}
}