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NOx 정화효율 향상을 위한 승용 디젤 엔진의 Urea SCR 시스템 유동 및 분무 특성에 관한 연구
황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),이강수(Kang-Soo Lee),박재인(Jae In Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In recent years, green house gas (GHG) was mainly interested topic all over the world and CO₂ emission from the automotive field is an important issue. Diesel engine has a good point in point of fuel economy or CO₂ emission than gasoline engine, but it has a problem reducing NOx emission. As the Urea-SCR (Selective Catalytic Reduction) system is most useful technology to reduce NOx emission from diesel engine, many vehicle maker was produced the heavy duty diesel engine for EURO 4 with Urea-SCR system. However, light duty diesel engine was achieved emission regulation with EGR (Exhaust Gas Recirculation), many vehicle manufactures considered Urea-SCR system in light diesel engine to meet EURO 5 or futhermore. In this paper, 3D computational analysis was performed in light duty diesel engine exhaust system with SCR catalyst and uniformity index at the SCR catalyst was calculated. And spray pattern and SMD (Sauter Mean Diameter) of the urea droplet were analyzed with PMAS (Particle Motion Analysis System). The spray model in the commercial code was modified with measured SMD and evaporation characteristic was analyzed. And ammonia uniformity index was calculated at the SCR catalyst. Moreover static mixer was designed to enhance urea droplet evaporation. Finally engine experiment was performed with urea dosing unit and the NOx conversion efficiency was measured. And the results from the analysis was validated with experimental results.
LPI 엔진 가솔린 연료 착화 시험 및 가능성 평가를 위한 연구
황인구(In-Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),이종수(Jong-Soo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to perform firing test of the LPI engine using gasoline fuel and to evaluate the effect on the LPI engine. Gasoline fuel supplies at 3 bar with commercial gasoline fuel pump and supply method is reverse direction : 3-4-2-1 cylinder. Engine test performs at idle, 1500 rpm and 2000 rpm. Air excess ratio difference of individual cylinder is 0.1 and maximum combustion pressure difference is 1~2 bar. Coolant temperature is 25℃. After firing test, residual gasoline volume at fuel line is about 32 cc. Purging fuel line with compressed air, residual gasoline volume is less than 2 cc. Restarting engine using LPG fuel, engine start time is 0.58 second and other problems are not occurred.
바이오에탄올 연료의 엔진성능 및 배기 배출물에 관한 연구
황인구(In-Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),이수룡(Su-Ryong Lee),이진휘(Jin Hui Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The purpose of this study is to investigate engine performance and pollutant emission of commercial gasoline engine using bio-ethanol The blending rate of bio-ethanol are 10 and 20 percent. Bio-ethanol addition to pure gasoline increases octane number, reid vapor pressure and volumetric efficiency. The result of cycle simulation is that the indicated mean effective pressure and thermal efficiency are same level for pure gasoline and bio-ethanol blended fuel. Using bio-ethanol blended fuel, brake specific fuel consumption of the engine increases, MBT of the engine slightly advances, THC and CO emission level decrease as a result of the oxygen atom in the ethanol molecule. And exhaust gas temperature and NOx emission decrease because of high latent heat of vaporization of the ethanol.
에탄올 가솔린 혼합연료를 이용한 엔진의 성능 및 배출물 특성에 대한 연구
황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In recent years, as the regulatory standards for vehicle emissions have become increasingly more stringent and fossil fuels have been depleted year by year, much attention has been moved to the development of alternative automotive fuels among car makers. Ethanol is considered as one of the most promising alternative automotive fuels in worldwide. Ethanol is the bio-energy produced from grains and organic waste materials such as sugarcane and waste products. The advantages of ethanol as an automotive fuel are high octane number and high latent heat of evaporation, potential emission reduction and economical fuel price over gasoline. However, heating value is lower than gasoline and large amount of toxic acetaldehyde is emitted. The purpose of this paper is that assesses the engine performance and exhaust emission characteristics using ethanol gasoline mixture. The ethanol was blended with gasoline 0, 10 and 20 vol.%. This study is focused on the engine performance, fuel economy and emission characteristics compared with using gasoline. Moreover, unburned ethanol and acetaldehyde are analyzed with gas chromatography and liquid chromatography.
황인구(In Goo Hwang),명차리(Cha-Lee Myung),김성근(Sungkun Kim),박심수(Simsoo Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This study is focused on the nano particle emission characteristics from a side mounted GDI (Gasoline Direct Injection) and LPG-DI (Liquefied Petroleum Gas Direct Injection) engine and vehicle. The fuel supply system of commercial GDI vehicle is reworked to a return type liquid phase LPG fuel injection system. The LPG tank with low pressure BLDC pump and pressure regulator were installed in the test vehicle. Engine operation variables of GDI engine were calibrated to optimal value for LPG fuel. Nano-particle number concentration from the GDI and LPG-DI engine were analyzed with DMS500. Regulated emission (THC, CO, CO₂, NOx) and nano particle number concentration from GDI and LPG-DI vehicle were analyzed of vehicle certification mode.
엔진 생산라인의 착화 시스템 표준화를 위한 범용 ECU 로직 및 운영 소프트웨어 개발에 관한 연구
황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),이내현(Nae Hyun Lee),이종수(Jong Soo Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is needed much time and cost for automotive manufacturer to apply various stages of End of Line (EOL) testing to the development, validation, and assembly of their production power-train. The application of EOL at various stages of the assembly line process ensures that family power-trains are produced to a common set of performance and reliability standards. However, the conventional EOL system has been constructed to cover the specific engines in checking the engine startability and diagnostic trouble code (DTC) using the separate ECU and data acquisition equipment which has no cost effectiveness. Therefore, improvement on the productivity of the EOL with universal ECU and control could confirm the quality of production engine and minimize the facility cost for revising period of production line when the additional power-train production would require in future. The purpose of this paper is mainly focused on the development of the real time monitoring system composed of universal ECU and S/W to enhance the productivity and reduce the investment on the EOL.
EGR cooler로 유입되는 냉각수 온도의 변화에 따른 NOx 및 PM의 배출 특성에 관한 실험적 연구
공호정(Hojeong Gong),황인구(In Goo Hwang),박심수(Simsoo Park),장용수(Yongsoo Jang),임창식(Changsik Lim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Diesel engine has advantages in point of carbon dioxide reduction than gasoline engine. But NOx emitted from diesel engine is still an important issue, Cooled EGR System is widely used in diesel engine for reducing NOx, As EGR rate is incresed, combustion stability was worse and PM level was increased. So it is important to determine optimal control point of EGR rate. In this research, NOx and PM emission was analyzed with various coolant temperature supplied to the EGR cooler at several positions such as downstream of turbocharger and upstream and downstream of DPF. And CO₂ was measured in exhaust pipe and intake manifold to calculate EGR rate at each engine operating condition. Also combustion analysis was performed in each engine operating condition.