Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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NOx Conversion Characteristics of HC-LNT System according to Secondary Injection Conditions in a Diesel Engine

디젤엔진에서 2차 분사조건에 따른 HC-LNT 시스템의 NOx 변환 특성

  • 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)
  • Received : 2012.01.26
  • Accepted : 2012.04.02
  • Published : 2012.09.01
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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

References

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