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http://dx.doi.org/10.7467/KSAE.2012.20.4.150

A Study on NOx Reduction Characteristics of LNT Catalyst with Fuel Injection Control in Light-duty Diesel Engine  

Hwang, Seung-Kwon (School of Mechanical Engineering, Graduate School of Korea University)
Ko, A-Hyun (School of Mechanical Engineering, Graduate School of Korea University)
Yoon, Joo-Wung (School of Mechanical Engineering, Graduate School of Korea University)
Myung, Cha-Lee (School of Mechanical Engineering, Korea University)
Park, Sim-Soo (School of Mechanical Engineering, Korea University)
Kim, Eun-Seok (R&D Center, Heesung Catalysts Corp.)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.20, no.4, 2012 , pp. 150-155 More about this Journal
Abstract
Lean NOx Trap (LNT) catalysts are capable of reducing exhaust NOx emissions from diesel engines. LNT stores NOx in lean condition and exhausts N2 by reducing NOx in rich condition. NOx reduction characteristic of LNT catalysts using throttle position sensor and fuel injection timing control for light-duty diesel engine was investigated. In contrast to SCR system, LNT catalyst uses diesel fuel in resuctant. Also if the concentration of reductant is exceeded, excessive amount of reductant will slip throughout LNT and cause another emission problem. Thus LNT regeneration with precise engine control established that can make higher NOx conversion efficiency and lower fuel penalty, prevent another emission problem. NOx and reductant concentration were measured by the NOx sensor and Mexa7100D equipped inlet and outlet of catalyst. As a result of engine test, regeneration strategy has reached high of 77.8% NOx conversion efficiency according to engine operation condition. Moreover, we have proved that it is possible to use regeneration strategy of LNT within 5% fuel penalty.
Keywords
LNT; NOx; Regeneration; Lambda; Reductant; Conversion efficiency;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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