TY - EJOU AU - Zhu, Jinliang AU - Wang, Xiulei AU - Wang, Guihua AU - Zhong, Xianglin AU - Li, Zhenguo AU - Wang, Zhiming AU - Sun, Ke AU - Bai, Shuzhan TI - Experimental Analysis of the Influence of Exhaust Thermal Management on Engine NOx Emission T2 - Fluid Dynamics \& Materials Processing PY - 2022 VL - 18 IS - 3 SN - 1555-2578 AB - 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 NOx 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 NOx. 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 NOx 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 NO2/NOx ratio, and the urea consumption has been observed to be relatively limited. KW - Intake throttling valve; NOx emissions; overrun; diesel DO - 10.32604/fdmp.2022.019311