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디젤 산화촉매의 귀금속 함량에 따른 NO₂ 배출랑 변화 특성
김훈명(Hoonmyung Kim),박용성(Yongsung Park),최승환(Seunghwan Choi),이광구(Gwang-Goo Lee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
Emission characteristics of NO₂ are carefully investigated with the contents of precious metal in diesel catalyst system, which consists of oxidation catalyst and diesel particulate filter in a single can. The diesel engine is tested by three types of experimental methods. From the NO₂ conversion test at the rated RPM, the conversion rare of NOx, into NO₂ decreases in lower precious metal case (Catalyst B) compared with base case (Catalyst A). The increase rate of NO₂ is calculated using the measured NOx(NO, NO₂) concentrations in ETC mode test. It is lowered by 6% in Catalyst B because of its larger light-off time. BPT test consisting of 10 load stages at the rated RPM shows that balance point temperature of PM increases with the lower content of precious metal. All the experimental results consistently indicate that it is possible to satisfy NOx regulation by properly lowering content of precious metal in diesel catalyst system.
Off-Road 기계식 디젤엔진의 EGR Map 적용에 따른 배출가스 특성 연구
김훈명(HoonMyung Kim),강정호(JeongHo Kang),한다혜(DaHye Han),하형수(HyeongSoo Ha),표수강(SuKang Pyo),안중규(JuengKyu Ahn) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.8
최근 대기환경 개선에 대한 관심이 대두되면서 화석연료를 사용 하는 기관에 대한 배출가스 저감연구가 활발하게 진행 되고 있다. 본 연구는 이러한 저감 기술 중 NOx를 저감하기 위해 가장 많이 적용 되고 있는 EGR system을 Off-road 기계식 디젤엔진에 적용하였을 때 나타나는 배출가스 특성을 파악하기 위하여 진행되었다. EGR system 적용을 위하여 먼저 엔진의 운전영역에 대한 배출가스 특성을 파악하였고, 각각의 엔진회전수 조건에서 다양한 EGR 조건을 적용하여 NOx 저감을 위한 최적 EGR 율을 도출하였다. 이에 따라 수정된 EGR 맵 적용 조건의 엔진 배기 특성에 대해 NRTC 모드를 구현하여 EGR 미적용 조건 및 기존 맵과 비교 및 고찰하였으며, 그 결과로 EGR 미적용 조건 대비 NOx가 약 42% 저감됨을 보였다. Because reducing atmospheric pollution is becoming a serious issue, studies are actively focusing on exhaust gas reduction. This study was conducted to determine the emission characteristics when applying an EGR system, the main approach used for NOx reduction, to an off-road mechanical diesel engine. For the application of the EGR system, the emission characteristics in consideration of the engine conditions were analyzed. The optimum EGR ratio for NOx emission reduction was determined by applying variable EGR conditions for each engine speed condition. Considering the above process, the emission characteristics of the modified EGR condition are compared with those of other conditions (non-EGR and existing EGR condition) in the NRTC mode. Consequently, NOx emission was reduced by around 42 compared with the non-EGR condition when using the modified EGR map.
디젤 산화촉매의 귀금속 함량에 따른 NO₂ 배출량 변화 특성
김훈명(Hoonmyung Kim),박용성(Yongsung Park),최승환(Seunghwan Choi),이광구(Gwang-Goo Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.4
Emission characteristics of NO₂ are carefully investigated with the contents of precious metal in diesel catalyst system, which consists of oxidation catalyst and diesel particulate filter in a single can. The diesel engine is tested by three types of experimental methods. From the NO₂ conversion test at the rated RPM, the conversion rate of NO<SUB>x</SUB> into NO₂ decreases in lower precious metal case (Catalyst B) compared with base case (Catalyst A). The increase rate of NO₂ is calculated using the measured NO<SUB>x</SUB>(NO, NO₂) concentrations in ETC mode test. It is lowered by 6 % in Catalyst B because of its larger light-off time. BPT test consisting of 10 load stages at the rated RPM shows that balance point temperature of PM increases with the lower content of precious metal. All the experimental results consistently indicate that it is possible to satisfy NO<SUB>x</SUB> regulation by properly lowering content of precious metal in diesel catalyst system.
Tier 4 배기규제 만족을 위한 오프로드 엔진 전처리 기술 및 배출가스 특성에 관한 연구
김훈명(HoonMyung Kim),한다혜(DaHye Han),강정호(JeongHo kang),표수강(SuKang Pyo),정학섭(HakSup Jung) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Due to problems such as environmental problems caused by toxic exhaust emissions from internal combustion engines, the regulations on off-road diesel engines are being tightened and pre-processing and post-processing technology to meet the requirements of the regulations are being developed at the present. This study applied the improved turbocharger that increased the supercharged pressure of the turbocharger, which is a pre-processing technology, to identify the characteristics of the increase of the supercharged pressure. In addition, the characteristics of the emission gas based on the control of the injection timing and the EGR rates were analyzed. When equipped with the improved turbocharger, it was identified that the THC, CO and smoke decreased and the NOx was increased in comparison to the existing turbocharger. It was further identified that the NOx was reduced due to the ultimate increase of the EGR.
56kw 오프로드 디젤엔진 인터쿨러 장착에 따른 배출가스 특성에 관한 연구
김훈명(HoonMyung Kim),한다혜(DaHye Han),강정호(JeongHo kang),표수강(SuKang Pyo),정학섭(HakSup Jung) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The off-road vehicles generally use diesel engines, that have lats of particulate matter(PM) and nitrogen oxide(NOx) when burned in an engine. And what"s more the emission NOx by increase as engine efficiency increases. In this paper, the combustion and emission characteristics of intake air temperature use 56kW off-road engine install intercooler at full road and non-road transient cycle mode. measure the engine performance and emission amount due to a variety of efficiency. and analyzing those matters.
비도로용 디젤엔진의 Urea SCR system 적용을 위한 NO<sub>2</sub>/NOx ratio 예측모델 개발에 관한 연구
강석호 ( Seokho Kang ),김훈명 ( Hoonmyung Kim ),강정호 ( Jeongho Kang ),박은용 ( Eunyong Park ),권오현 ( Ohyun Kwon ),김대열 ( Daeyeol Kim ) 한국분무공학회 2020 한국액체미립화학회지 Vol.25 No.4
The current emission regulations, US Tier-4 and EU Stage-V, are only able to satisfy the regulations when all currently mass-produced emission reduction technologies such as EGR, DOC, DPF, and SCR are applied. Therefore, in this study, for the application of the Urea-SCR system to non-road diesel engines, the database was established by measuring the NO, NO<sub>2</sub> concentration and calculating the NO<sub>2</sub>/NO<sub>x</sub> ratio based on the catalyst temperature and exhaust mass flow rate. Also, based on the measured NO<sub>2</sub>/NO<sub>x</sub> ratio data, a mathematical model was proposed to predict the NO<sub>2</sub>/NO<sub>x</sub> ratio at SCR catalyst, and the suitability of the model was verified through steady-state and transient mode. As a result of comparing the NO<sub>2</sub>/NO<sub>x</sub> ratio measured at the DOC outlet under the steady-state condition to two model values separately, the R<sup>2</sup> was 0.9811 for the 3D map model and 0.9303 for the mathematical model. And in the case of the NO<sub>2</sub>/NO<sub>x</sub> ratio measured at the DPF outlet, the R<sup>2</sup> was 0.9797 for the 3D map model and 0.935 for the mathematical model. It was confirmed that the R<sup>2</sup> with the model value of the 3D Map of the mathematical model in the transient mode is 0.957, which shows high reliability.
Urea-SCR System의 NH₃ Slip 저감을 위한 NOx Sensor 기반 폐루프 제어기 개발에 관한 연구
강석호(Seokho Kang),오승영(Seungyoung Oh),이민광(Minkwang Lee),김훈명(Hoonmyung Kim),강정호(Jeongho Kang) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.2
For non-road diesel engines of 56 kW or higher, the application of SCR is essential in order to comply with the NOx regulation of the current emission regulations. In order to maximize the NOx reduction efficiency of the SCR system, the NH₃ adsorption characteristics of the SCR catalyst can be utilized. Since the NH₃ adsorbed on the SCR catalyst has no direct measurement method, it is inevitable to rely on the NH₃ adsorption estimation model, and there is a possibility that NH₃ slip may occur due to model error. Therefore, this study proposed a closed loop control method in order to minimize NH₃ slip by utilizing the NOx sensor signal at the SCR catalyst outlet. It was verified through the NRTC mode, the certification test mode for non-road diesel engines. As a result of the test, it was confirmed that the closed loop controller proposed in this study can reduce NH₃ slip through detailed calibration.