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http://dx.doi.org/10.7467/KSAE.2012.20.5.130

NOx Conversion Characteristics of HC-LNT System according to Secondary Injection Conditions in a Diesel Engine  

Park, Jin-Kyu (Department of Mechanical Engineering, Hanyang University)
Oh, Jung-Mo (Department of Mechanical Engineering, Hanyang University)
Lee, Ki-Hyung (Department of Mechanical Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.20, no.5, 2012 , pp. 130-137 More about this Journal
Abstract
Automotive engines need strategies to satisfy with the emission regulations in terms of PM and NOx. HC-LNT (Hydrocarbon-Lean NOx Trap) with secondary injection system is considered as more practical technology in order to cope with emission regulations. The HC-LNT system, which is using diesel fuel itself as a reducing agent, absorbs NOx in lean exhaust gas condition and releases NOx in rich exhaust gas conditions. In this system, inappropriate amounts of reducing agent will slip through the LNT without the profits of conversion and cause additional emission problems. Therefore, the suitable amount of reducing agent should be supplied into the catalytic converter. In this research, engine emission test was conducted to optimize injection quantity at the various engine test conditions. Different exhaust layouts and catalyst shapes have been studied and extension unit which makes better uniformity of exhaust gas was used for HC-LNT system. From this results, the effect of secondary injection conditions on NOx conversion characteristics of HC-LNT was clarified.
Keywords
HC-LNT(Hydrocarbon-lean NOx Trap); Secondary injection system; NOx; E-unit(Extension unit); Diesel engine;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 J. M. Oh, W. K. Mun, K. B Kim, J. H. Lee and K. Y. Lee, "Study on the Optimal Injection Condition for HC-LNT Catalyst System for Diesel Engines with a Gasoline PFI Type Injector," Transactions of KSME(B), Vol.35, No.2, pp.121-127, 2011.   과학기술학회마을   DOI
2 H. Weltens, "Optimisation of Catalyfic Converter Gas Flow Distribution By CFD Prediction," SAE 930780, 1993.
3 J. M. Oh, W. S. Cha, K. B Kim, J. H. Lee and K. Y. Lee, "A Study on the Characteristic and Droplet Uniformity of Spray Injection to Exhaust Gas Flow from Urea Solution Injector," Transactions of KSAE, Vol.19, No.3, pp.83-89, 2011.   과학기술학회마을
4 Y. R. Kim, M. S. Kim, H. Cho and K. D. Min, "A Study on the Characteristics of an Evaporating Diesel Spary Using Life Technique," Journal of ILASS-Korea, Vol.7, No.3, pp.18- 23, 2002.
5 J. M. Storey, "Hydrocarbon Species in the Exhaust of Diesel Engines Equipped with Advanced Emissions Control Devices," Coordinating Research Council, Inc. CRC Project No.AVFL-10b-2, 2005.
6 G. W. Nam, J. W. Park, J. H. Lee and G. K. Yeo, "The Effect of an External Fuel Injection on the Control of LNT System ; the Diesel NOx Reduction System," SAE 2007-01-1242, 2007.
7 T. Morita, N. Suzuki, N. Satoh, K. Wada and H. Ohno, "Study on Low NOx Emission Control Using Newly Developed Lean NOx Catalyst for Diesel Engine," SAE 2007-01-0239, 2007.
8 N. Kondo, Y. Takeda, Y. Tsutsui, K. Suzuki, Y. Takahashi and M. Murata, "Development of Lean NOx Trap System for Commercial Vehicle- Application to Multi Cylinder Engine and Development," SAE 2005-01-3875, 2005.
9 I. Hachisuka, T. Yoshida, H. Ueno, N. Takahashi, A. Suda and M. Sugiura, "Improvement of NOx Storage-reduction Catalyst," SAE 2002- 01-0732, 2002.
10 J. S. Park, S. M. Lee, H. K. Lee, J.-W. Park, J. Lee and H.-J. Kim, "Development of Control Logic and Optimization of Catalyst in DeNOx System with Secondary Injection for Euro 6," SAE 2010-01-1067, 2010.
11 J. M. Oh, K. Y. Lee and J. H. Lee, "A Study on the Optimal Injection Conditions for an HCLNT Catalyst System with a 12-hole Type Injector," Journal of Thermal Science and Technology, Vol.3, No.2, pp.278- 291, 2008.   DOI
12 J. M. Oh, K. H. Lee and H. Y. Jeong, "Study on the Spray Behavior and Diesel Fuel Distribution Characteristics of a Secondary Injector for a Lean NOx Trap Catalyst," Energy & Fuels, Vol.22, pp.1527-1534, 2008.   DOI