Evaluation of the real-time de-NOx performance characteristics of a LNT-equipped Euro-6 diesel passenger car with various vehicle emissions certification cycles
- Authors
- Myung, Cha-Lee; Jang, Wonwook; Kwon, Sangil; Ko, Jinyoung; Jin, Dongyoung; Park, Simsoo
- Issue Date
- 1-8월-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Diesel NOx emissions; Lean NOx trap; Vehicle test modes; Conversion efficiency; Regeneration
- Citation
- ENERGY, v.132, pp.356 - 369
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY
- Volume
- 132
- Start Page
- 356
- End Page
- 369
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82589
- DOI
- 10.1016/j.energy.2017.05.089
- ISSN
- 0360-5442
- Abstract
- Advanced nitrogen oxides (NOx) after-treatment systems for diesel cars are effectively reducing tailpipe NOx emissions in laboratory test cycles; however, some de-NOx systems showed limitation for passing environmental standards during real-world driving conditions. In this study, the NOx concentration of a lean NOx trap (LNT)-equipped diesel engine were investigated over various vehicle certification cycles. The LNT performance was compared to the new European driving cycle (NEDC), world-harmonized light duty vehicle test cycle (WLTC), federal test procedure (FTP)-75, highway fuel economy test (HWFET), and U506. The real-time NOx concentration behaviors were tracked using NOx sensors at the engine-out and downstream of the LNT to determine the NOx storage and regeneration phase. The NOx conversion efficiencies were 36.3-71.7% of which reflecting the mode severity and cycle duration of the diesel engine. The tailpipe NOx emissions were 0.059 g/km during the NEDC which was within the Euro-6 emissions regulations. The NOx emissions in the WLTC, FTP-75, and US06 modes were approximately 1.9, 1.5, and 6.6 times higher than the NEDC due to the higher frequency of LNT purge and higher engine-out NOx formation. During the diesel particulate filter (DPF) regenerating stage in WLTC mode, tailpipe NOx emissions substantially increased by more than 8.8-fold. The exhaust gas recirculation (EGR) supply and lambda control scheme were closely related with strong NOx increment at de-NOx and de-PM processes. (C) 2017 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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