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대형 디젤 엔진 후처리 Plasma/Oxidation Catalyst/DPF 시스템의 재생 성능에 관한 연구
서형만(Hyongman Seo),이재욱(Jeawook Lee),이형상(Hyungsang Lee),전광민(Kwang Min Chun) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Oxidation catalyst and plasma assisted oxidation catalyst were tested about its ability to regenerate diesel particulate filter system in a heavy duty diesel engine at the engine speed of 1260rpm. The gaseous emissions and the back pressure were measured to investigate the NO/NO₂ conversion and to determine DPF regeneration in the tests. NO/NO₂ conversion with oxidation catalyst began at 220℃ and increased up to 300℃ with the maximum conversion efficiency of 60%. And by assisting the oxidation catalyst with plasma reaction, the NO/NO₂ conversion increased about 10% and resulted in the improvement of DPF regeneration speed.
승용디젤 차량의 DPF Soot량 검출 최적화에 관한 연구
서형만(Hyongman Seo),한석재(Sukjae Han),배기송(Kisong Bae),정철화(Chulhwa Jung),김충공(Chungkong Kim),김원근(Wonkun Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Period of regenerations has great effects on fuel consumption and durability of DPF. Shorter period of regeneration increases fuel consumption and longer period of regeneration causes uncontrolled burning during regeneration phases. Therefore, the proper detection of soot mass in DPF is a very important factor for regeneration strategy. Currently used differential pressure model can not properly detect the soot mass during CRT(Continuous Regeneration Trap) regeneration. It detects soot mass lighter than actual soot mass. Differential pressure model can be optimized by correcting value depending on the driving condition. This paper presents a procedure and calibration method which can enhance an accuracy of soot mass detection in vehicle condition.
SCR촉매 열화도에 따른 암모니아 목표흡장량 다원화를 위한 SCR aging factor 개발
김희중(Huijung Kim),김미진(Mijin Kim),서형만(Hyongman Seo),김영진(Youngjin Kim),김평순(Pyungsoon Kim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
NOx conversion efficiency of Cu-Zeolite SCR catalysts in diesel engines decreases as the catalyst aging progresses. In order to optimize the NOx conversion performance, it is necessary to apply various NH₃ storage amount suitable for degree of aging of the catalyst. In this study, sensitivity coefficient for SCR is derived and by using this coefficient, the amount of NH₃ storage can be calculated according to thermal load. Finally, the development of SCR aging factor for predicting NH₃ storage amount according to degree of catalyst aging was improved NOx conversion performance at real road driving exhaust gas test