Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on NOx Reduction Characteristics of LNT Catalyst with Fuel Injection Control in Light-duty Diesel Engine

승용디젤엔진의 연료분사 제어를 통한 LNT 촉매의 NOx 저감 특성에 관한 연구

  • 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.)
  • 황승권 (고려대학교 대학원 기계공학부) ;
  • 고아현 (고려대학교 대학원 기계공학부) ;
  • 윤주웅 (고려대학교 대학원 기계공학부) ;
  • 명차리 (고려대학교 기계공학부) ;
  • 박심수 (고려대학교 기계공학부) ;
  • 김은석 (희성촉매 기술연구소)
  • Received : 2011.12.14
  • Accepted : 2011.12.30
  • Published : 2012.07.01
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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.

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References

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