NOx Emission Reduction Effect under Joint Control of SCR and EGR

PENG Meichun; CHEN Yue; ZOU Kangcong; HUANG Wenwei

doi:10.3969/j.issn.1001-2222.2020.05.014

Vehicle Engine ›› 2020, Vol. 0 ›› Issue (5) : 87-92. DOI: 10.3969/j.issn.1001-2222.2020.05.014

NO_x Emission Reduction Effect under Joint Control of SCR and EGR

PENG Meichun¹,CHEN Yue¹,ZOU Kangcong¹,HUANG Wenwei²

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Abstract

The RDE test of a heavyduty diesel truck was carried out in order to study the effects of EGR and SCR control techniques on improving NO_xemission in real conditions. Three test schemes were designed including single EGR, SCR and EGR, and uncontrolled measures. The vehicle ran along the urban, suburb and high way and the instantaneous NO_x emission concentration, vehicle speed, exhaust temperature, EGR rate, engine speed and load were measured. The analysis was conducted to find the relationship between NO_x emission and vehicle speed, engine operating conditions, EGR rate and exhaust temperature, and the comparison was conducted to find the differences of NO_x emission between different control configurations. The results show that NO_x emission increases with the increase of vehicle speed without any emission controls, decreases with the increase of vehicle speed and has a higher concentration in high speed region with EGR and SCR controls. In addition, the high exhaust temperature can lead to a better efficiency of SCR and the increase of EGR rate can also lead to the reduction of NO_x. It is found that the EGR rate is the highest at low speed. The reductions of NO_x emission for EGR, SCR, and EGR and SCR were over 16%, 51% and 92% respectively.

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heavy-duty diesel vehicle / nitrogen oxide / EGR / SCR / emission

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PENG Meichun,CHEN Yue,ZOU Kangcong,HUANG Wenwei. NO_x Emission Reduction Effect under Joint Control of SCR and EGR[J]. Vehicle Engine. 2020, 0(5): 87-92 https://doi.org/10.3969/j.issn.1001-2222.2020.05.014