Impacts of ambient temperature, DPF regeneration, and traffic congestion on NOx emissions from a Euro 6-compliant diesel vehicle equipped with an LNT under real-world driving conditions
- Authors
- Ko, Jinyoung; Myung, Cha-Lee; Park, Simsoo
- Issue Date
- 1-3월-2019
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Real driving emissions (RDE); NOx emission; Lean NOx trap (LNT); Ambient temperature; Diesel particulate filter (DPF) regeneration; Traffic congestion
- Citation
- ATMOSPHERIC ENVIRONMENT, v.200, pp.1 - 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- ATMOSPHERIC ENVIRONMENT
- Volume
- 200
- Start Page
- 1
- End Page
- 14
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67042
- DOI
- 10.1016/j.atmosenv.2018.11.029
- ISSN
- 1352-2310
- Abstract
- A real driving emissions test procedure was introduced as a supplement to the chassis dynamometer test to diminish the discrepancy between on-road emissions and type approval certification emissions. In this study, on-road NOx emissions from a 2.2 L diesel vehicle equipped with a lean NOx trap were measured not by a portable emissions measurement system but by NOx sensors and an exhaust flow meter. This method provides a strategy for analyzing on-road NOx emissions with a measurement system that is relatively cheap, light and simple. The effects of ambient temperature, diesel particulate filter regeneration, traffic congestion, NOx conversion efficiency and uphill/downhill sections on NOx emissions were evaluated by comparing the NOx emissions characteristics using engine-out and lean NOx trap-out NOx sensors. NOx emissions in congested traffic conditions were 29% higher than those in smooth traffic conditions. NOx emissions at 33 degrees C were 55% higher than those at 27 degrees C. Additionally, NOx emissions under specific conditions with diesel particulate filter regeneration were 30% higher than those under normal conditions. The average on-road NOx emission factor for all test cases was 7.35, but this value decreased to 5.7 when an ambient temperature corrective factor (1.6) was applied for extended test conditions.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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