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김창업(Changup Kim),박철웅(Cheolwoong Park),강건용(Kernyong Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The liquid phase LPG injection (LPLi) system (the 3rd generation technology) has been considered as one of the more promising fuel supply systems for LPG vehicles. To investigate the characteristics of LPG residue in LPLi system, various rubbers were reacted with LPG fuels. The results showed that the residue of a cover rubber in a fuel pump after test increased 10 times higher than that before test. Furthermore, the amount of sulfur, nitrogen species which are considered as main sources in deposit formation in the LPLi fuel injector were also found to be higher than that in original LPG fuel. And these residues made the core parts of LPLi injector such as a neddle and a nozzle, partially worn, which eventually causes a leakage in LPLi injectors.
김창업(Changup Kim),오승묵(Seungmook Oh),강건용(Kemyong Kang) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
An LPG engine for heavy duty vehicles has been developed using liquid phase LPG injection (hereafter LPLI) system, which has regarded as one of the next generation LPG fuel supply systems. In this work to investigate the lean burn characteristics of heavy duty LPLI engine, various injection timing (SOl, start of injection) and double ignition method were tested. The results showed that lean misfire limit could be extended, by 0.2λ value, using the optimal SOl timing and engine performances were increased as well. Double ignition method was carried out by installing the second spark plug and modified ignition circuit to ignite the two spark plug simultaneously. Double ignition resulted in the stable combustion under ultra lean bum condition, below λ=1.7, and extension of lean misfire limit, by 0.2 λ value, compare to ordinary case. Therefore, LPLI engine with optimal SOl and double ignition method could be normally operated at around λ = 1.9 and showed higher engine performance.
[가솔린엔진부문] 엔진 운전변수가 가스연료 엔진의 HC 배출물에 미치는 영향
김창업(Changup Kim),배충식(Choongsik Bae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
Measurements of the concentrations of individual exhaust hydrocarbon species have been made under various engine operating in a 2-liter 4-cylinder engine for natural gas and LPG. Tests were performed at constant engine speed, 1800 rpm for two compression ratios(8.6 and 10.6), with various operating parameters, such as excess air ratio(1.0-1.6), bmeps(250-800 kPa) and spark timings(BTDC 10-55).<br/> It was found that the natural gas gave the less ozone formation than LPG in various operating conditions. This was accomplished by reducing the emissions of propylene(C₃H), which has relatively high MIR factor, and propane(C₃H) that originally has large portion of LPG. In addition, the natural gas show lower values in the SR and BSRs. Higher compression ratio showed higher NMHC emissions. However, SR decreased since fuel species of HC emissions increase BSRs showed almost same values under high bmep, over 500kPa for both fuels. This means that effect of increasing of NMHC emissions and effect of decreasing of SRs with higher bmep affect each other simultaneously. With advanced spark timing, BSRs of LPG were increased while those of natural gas showed almost constant values
[가솔린엔진부문] 여러 가지 운전조건에 따른 액상분사식 LPG 대형 단기통 연소엔진의 성능변화에 대한 연구
김창업(Changup Kim),오승묵(Seungmook Oh),강건용(Kemyoung Kang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As a fundamental study on LPi system application to heavy duty LPG engine, engine output and combustion performance were investigated with various operating conditions using a single cylinder combustion engine equipped with LPi fuel supply system. Experimental results revealed that no problems were occurred in application of the LPG fuel to heavy duty engine, and that volumetric efficiency and engine output, by 10% approximately, were increased with the LPi system. It was resulted from the decrease of the intake manifold temperature through liquid phase LPG fuel injection. These results provided an advantage in the decrease of the exhaust gas temperature, in the control of knocking phenomena, spark timing and compression ratio. The LPi engine could normally operated under λ =1.5 or EGR 30% condition. The optimized swirl ratio for the heavy duty LPG engine was found around Rs = 2.0.
김창업(Changup Kim),오승묵(Seungmook Oh),강건용(Kemyong Kang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The liquid phase LPG injection (LPLI) system (the third generation technology) has been considered as one of the next generation fuel supply systems for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type(the second generation technology) fuel supply system. However, when a liquid LPG fuel is injected into the inlet duct of an engine, a large quantity of heat is extracted due to evaporation of fuel. This leads to freezing of the moisture in the air around the outlet of a nozzle, which is called icing phenomenon It may cause damage to the outlet nozzle of an injector or inlet valve seat. In this work, the experimental investigation of the icing phenomenon was carried out. The results showed that the icing phenomenon and process were mainly affected by humidity of inlet air instead of air temperature in the inlet duct. Also, it was observed that the total ice formed around the nozzle weighs at about l50mg-260mg after injection for ten minutes. And some fuel species were found in the ice attached at the front side of a nozzle, while frozen ice attached at the back of a nozzle was mostly consisted of moisture of inlet air. Therefore, some frozen ice deposit, detached from front nozzle of an injector, may cause a problem of unfavorable air fuel ratio control in the small LPLI engine.
김창업(Changup Kim),이대훈(Deahoon Lee) 한국가스학회 2014 한국가스학회지 Vol.18 No.1
본 연구에서는 LPG자동차용 LPG 액상분사 인젝터의 분사구 앞에 장착할 수 있는 플라즈마 개질기의 개발을 진행하였다. 이 개질기는 플라즈마 방전이 발생하는 영역에 공기와 LPG 연료를 분사시켜 고분자 탄소연료를 열해리시키고 추가로 수소를 발생시키기 위한 목적으로 개발되었다. 인젝터와 플라즈마 발생부와의 거리와 기하학적인 방전길을 최적화하여 개질 반응이 일어나는 인젝터 개질기를 완성하였으며, 개질 결과 공급 전력 70 ~ 100W 일 때 HC은 전체 개질가스의 약 0.7% 이며, 수소는 1.2 ~1.5% 발생하였다. In this study, plasma reformer technology with a LPG injector was investigated. It was developed with injection of LPG fuel and air in a region where the plasma discharge to make the thermal decomposition carbon fuel and to generate additional hydrogen. As a result of reforming test, when power is 70 ~ 100W supply, about HC 0.7% of the full reformed gas and hydrogen was generated from 1.2 to 1.5 %.
김창업(Changup Kim),신문성(Moonsung Shin),백승국(SeungKook Baik) 한국가스학회 2012 한국가스학회지 Vol.16 No.6
우리나라의 LPG자동차 기술은 2003년 LPG액상분사방식 차량의 양산을 계기로 크게 발전하기 시작하였으며, 지금까지 관련기술의 발전을 거치면서 SULEV 배출가스 규제를 만족하는 수준에 이르렀다. 우리나라의 LPG자동차 등록수는 240여만 대를 넘어서면서 세계 1위의 LPG자동차 보유수를 보이고 있다. 그러나 이러한 많은 대수를 보유하고 있음에도 불구하고, 지금까지 LPG자동차의 핵심 연료시스템은 외산기술을 이용하는 라이센스 제작, 조립 및 판매를 진행하고 있다. 특히 LPG액상분사식 자동차의 핵심부품인 LPG인젝터는 국제 부품공급사인 C사의 D 인젝터를 이용하여 왔다. 이에 본 연구에서는 국산 LPG인젝터의 개발을 이루고자 하며, 개발과정에서 가장 핵심적인 LPG 누설성능 개선에 영향을 미치는 코팅기술의 성능향상연구를 집중하였다. 본 연구에서 WCC 코팅 및 구조 최적화를 통하여 기존의 D 인젝터의 0.06cc/min 누설성능을 0.04cc/min 수준 이하로 낮출 수 있었다. The LPG engine technology in Korea has made significant advances with the mass production of LPG vehicle with liquid phase LPG injection system, and have reached to satisfy the SULEV emission regulations. As of now, domestic production of LPG fuelled vehicles in Korea have reached more than 2.4 millions, which is the best in the world. But in the technical point of view, the key technologies for fuel injection system of LPG fuelled engine are mainly dependent on foreign license. Especially, fuel injector in the liquid phase LPG injection system has been imported from C company, which supplies LPG injector worldwide in the name of model D. In the context, it is quite urgent to develop the LPG injector technology in Korea. In this study, WCC coating which is key technology to develop LPG injector by reducing the fuel leakage was developed and tested. Considering the fuel leakage of 0.06cc/min in commercial LPG injector, fuel leakage was reduced down to 0.04cc/min with WCC coating technology and optimization of injector structure.