Experimental Analysis of the Influence of Exhaust Thermal Management on Engine NO_(x) Emission  

作　　者：Jinliang Zhu Xiulei Wang Guihua Wang Xianglin Zhong Zhenguo Li Zhiming Wang Ke Sun Shuzhan Bai 

机构地区：[1]School of Energy and Power Engineering,Shandong University,Jinan,250061,China [2]China Automotive Technology&Research Center Co.,Ltd.,Tianjin,300300,China [3]National Engineering Laboratory of Mobile Source Emission Control Technology,Tianjin,300300,China

出　　处：《Fluid Dynamics & Materials Processing》2022年第3期701-711,共11页流体力学与材料加工（英文）

基　　金：This work was supported by the Natural Science Foundation Project of Shandong Provincial(Grant No.ZR2019MEE041);the open funds of National Engineering Laboratory of Mobile Source Emission Control Technology(Grant No.NELMS2019A01)。

摘　　要：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_(x) 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_(x).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_(x) 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_(2)/NO_(x) ratio,and the urea consumption has been observed to be relatively limited.

关 键 词：Intake throttling valve NO_(x)emissions OVERRUN diesel 

分 类 号：TG1[金属学及工艺—金属学]