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활성탄을 이용한 액상분사 LPG엔진의 누설연료 제순환시스템에 관한 연구
명차리(Cha-Lee Myung),최성원(Seongwon Choi),박심수(Simsoo Park),한도(Doh Han) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Mechanical fuel supply system of conventional LPG engine is simple, but on the other hand it isn't good at accurate fuel control. From this reason, LPG engine vehicles have been showed a poor catalytic efficiency and low engine power characteristics. Thus, LPLi(Liquid Phase LPG injection) engine which equipped a electro controlled fuel supply system has been used for better engine performance and emission characteristics. But the fuel leakage phenomena of LPLi engine are still pointed out. Fuel which remained in fuel rail after engine stop is evaporated by heat transfer from engine body and leaked out through injector in a gas phases. Leaked fuel causes a rich mixture and makes a dense THC emission during engine start phase. To meet future stringent emission standards, THC emission during start phase must be reduced. This study devised a leakage fuel recirculation system. Leakage fuel recirculation system absorbs a leaked fuel with a activated carbon canister after engine stop and releases a fuel to engine intake manifold at next engine start.
터빈방식 연료펌프로 구성된 LPi 연료공급 시스템의 LPG 조성비에 따른 토출성능 및 엔진적용성에 관한 연구
임무창,명차리,박심수,박정남,김성근,Lim, Mu-Chang,Myung, Cha-Lee,Park, Sim-Soo,Park, Jeong-Nam,Kim, Sung-Kun 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
Currently, BLDC fuel pump was applied on LPi vehicle using 3rd fuel supply system as liquified phase LPG injection method had already shown better performance than others. Its cost, however, is rather expensive because of drawbacks such as complicated structure, a fault of localization of system. In this work, demonstration system for a developed turbine type fuel pump to replace BLDC system was setup and investigated. This study results that fuel mass flow rate of turbine type pump and injection performance of injector were better compared to BLDC type. Comparing flow rate of summer LPG with that of winter LPG, the flow rate decreased about 25% using winter LPG. Performance applying turbine type LPi fuel pump to engine is confirmed.
가솔린 엔진에서 연료분사 압력이 천이운전시 배출가스 특성에 미치는 영향
이형민(Hyungmin Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park),임혁(Hyuk Im),한승국(Seung Kook Han),김우태(Wootai Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This work was investigated time resolved emissions behavior such as THC, NOx, and smoke emitted from tail-pipe on CVVT gasoline engine under fast transient operation with different fuel injection pressures. Transient operation type was simulated into very fast transient considering acceleration, steady, deceleration with automatically controlled servo motor which is coupled to throttle valve. Simultaneously measuring emissions with fast response gas analyzer and high sensitivity opacimeter, various sensor and actuating signals of a gasoline engine were diagnosed to verify the emission formation mechanism during transient operation. Consequently, high pressure injection plays a major role in emissions reduction during transient operation.
입자상 물질 수량 규제 대응을 위한 디젤 승용자동차의 국내연구기관간 입자상 물질 배출 상관성 시험 및 평가
이형민(Hyungmin Lee),권상일(Sangil Kwon),이상민(Sangmin Lee),전종익(Jongik Jun),우영민(Youngmin Woo),이민호(Minho Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In early 2008, the ILCE (Inter-Laboratory Correlation Exercise) was performed by the Korea Particle Measurement Program (KPMP) with a domestic diesel passenger vehicle equipped with a catalyzed DPF between three certification laboratories and the research center of an automotive manufacturer to meet EURO 5 and EURO 6 of particle number concentration for light-duty vehicles. This paper focused on measuring the particle number and mass levels from a representative light-duty diesel passenger vehicle during new European driving cycle (NEDC) mode to analyze the repeatability and reproducibility between laboratories in Korea. In addition, particle size distribution characteristics from ILCE test vehicle were compared with LPG, gasoline, and non-DPF diesel vehicles. From the ILCE test results in Korea, the mean total particle number concentration levels ranged from 5.43E+10 #/㎞ to 1.58E+11 #/㎞ and 0.0003 g/㎞ to 0.0036 g/㎞ for particle mass. Repeatability between participating laboratories ranged from 32% to 66% for particle number, 11% to 70% for particle mass; the reproducibility level was 46% for particle number, and 66% for particle mass emission.
누설연료 재순환 시스템이 LPLi 엔진의 THC 저감에 미치는 영향
이형민(Hyungmin Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
LPLi (Liquid Phase LPG injection) systems have the advantage of more precise air/fuel ratio control than that of conventional mixer type. However, LPLi systems have the problem to meet the future more stringent low emission standards because of the leakage phenomenon at the injector tip that produces excessive amount of THC exhaust during cold start and hot restart. Therefore, LPLi systems need additional help to adsorb the leakage fuel in intake manifold. This study was investigated the effects of THC reduction during cranking at variable soaking time from LPLi research engine, designed leakage fuel recirculation system. THC measurements were made after warm-up and soaking with conventional and high speed THC analyzer.<br/> In addition to real engine work. rig tests have been performed to estimate leakage fuel level at injector tip and working capacity of activated carbon canister. The main conclusion of this work shows that THC concentration was reduced about 60 % during cranking after absorbing leakage fuel in activated carbon canister
GDI 엔진의 연료 분사 제어 로직에 따른 나노입자 배출 특성에 관한 연구
이효근(Hyokeun Lee),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),박종일(Jongil Park),한승국(Seung Kook Han) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Nano-particle characteristics were investigated in the gasoline direct injection engine, for various air fuel ratios, fuel pressures and fuel injection timings in the part load condition. PN concentration and size distribution were measured by the DMS-500 equipped upstream of catalyst. Nano particle emission was closely related with fuel injection timing and in-cylinder flow motion in GDI engine. As a result, PN was decreased with increasing air fuel ratio and fuel pressure. And fuel injection timing was retarded over the middle intake stroke, particle emission was increased but reduced PN during the early intake stroke. In conclusion, optimization of the ECU control strategy on the fuel injection pressure, injection timing as well as air fuel ratio was needed to improve the nano particle emissions in GDI engine.
터빈방식 펌프 LPi연료공급 시스템의 엔진 고온재시동 시 LPG 조성비에 따른 연료레일에서의 압력 및 온도특성에 관한 연구
이강주(Kangju Lee),김주원(Juwon Kim),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Conventional LPG pump for Liquified Petroleum injection(LPi) engine has been adopted vane type. But the BLDC type fuel pump for LPi system has complicated structure and its price is high. Therefore, as a alternative, this study has mainly focused on the development of turbine type LPG pump which has lower cost and simple structure than conventional BLDC type. To verify the possibility of substitute the performance tests were performed for each fuel pump. The comparative items were pressure settling time, variation of fuel outlet temperature and engine performance of hot restart ability. As a result, performances of turbine type LPG pump were equivalent or high comparing to the BLDC type all over the tests for different fuel composition.
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.