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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.
듀얼 포트 분사식 인젝터와 흡기 밸브 열림 시기 연료 분사 전략 사용에 따른 포트분사식 가솔린 엔진의 전부하 성능 향상에 대한 연구
김남호(Namho Kim),이경현(Kyeonghyeon Lee),민경덕(Kyoungdoug Min),강경균(Kyeongkyun Kang),신문성(Moonsung Shin),김형진(Hyoungjin Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The DISI (Direct injection Spark Ignition) engines are becoming widely adopted as the higher specific power can be realized for DISI engines compared to the former PFI (Port Fuel Injection) engines. The underlying mechanisms of higher specific power of DISI engines are cooling effect of air due to evaporation of injected fuel and advancement of ignition timing due to fuel stratification. In DISI engines, however, wall impingement of fuel and formation of locally rich air-fuel mixture lead to increase in the THC (Total Hydrocarbon) and PM emission. If the fuel is injected when the intake vales are open in PFI engines, it is possible to utilize the cooling effect and ignition timing advancement like in DISI engines and increase the maximum power of engine. Such injection strategy is called OVI (Open Valve Injection). Previous studies on OVI were focused on the emission characteristics of engines rather than the power output of engine. Therefore, in this research, the effect of OVI on both the engine out emission and maximum power of engine was observed. The experiments to were conducted at WOT (Wide Open Throttle) condition, and increase in IMEP was observed while PM emission was lower than that of DISI engines at the same experimental condition.
박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi),백승국(Seungkook Baik),신문성(Moonsung Shin) 한국가스학회 2012 한국가스학회지 Vol.16 No.2
근래 들어 강화되는 배출가스 규제에 대응하기 위한 대책으로 LPG 차량에 적용되고 있는 제3세대 LPG 연료공급방식인 Lpi(Liquid phase LPG injection)는 펌프를 이용해서 고압의 액상연료를 공급하는 것이 가장 핵심적인 기술이다. Lpi 시스템은 액상연료분사의 전자식 정밀제어를 통해 출력이 상승하고 유해배출가스가 현저하게 저감되는 장점이 있으나, 가장 핵심적인 부품인 연료펌프 및 인젝터의 경우 대부분 수입에 의존하고 있어 시스템 설계에 유연하지 못하다. 본 연구에서는 인젝터의 국산화 개발을 위해 Lpi 시스템에 적합한 연료공급방법의 인젝터 디자인 및 최적의 작동조건 확보를 목표로 Lpi용 인젝터의 설계 및 시작품을 제작하여 누설 및 유량특성을 살펴보았다. In recent years, the need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as Lpi (Liquid phase LPG injection) which uses pump for the high pressure supply of liquid LPG fuel and is able to meet the limits of better emission levels while it has an advantage of higher power. Although it has the advantage of power and lower emission levels, the characteristics of LPG, such as high vapor pressure, lower viscosity and surface tension than gasoline fuels makes it difficult design system. Therefore most fuel pumps and injectors are imported. In the present study, in order to domestically develop LPG injector which guarantees flow rates and optimal operation, the experimental investigation on leakage and flow rate characteristics of developed prototype injector was carried out at the bench test rig for developed injector.
김상민(SANGMIN KIM),김진성(JINSUNG KIM),조영준(YOUNGJUN CHO),양시원(SIWON YANG),신문성(MOONSUNG SHIN) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
The high-pressure hydrogen valve is intended to supply hydrogen charged at high pressure in the hydrogen tank to the fuel cell stack, which decompresses high-pressure hydrogen gas to low pressure and primarily limits the excessive flow. It consists of a pilot valve, a main valve, and a excessive flow valve to operate in a wide pressure range from 2 to 70 MPa of charging pressure. The opening characteristics of the valve were confirmed by computation fluid dynamics applying the moving grid technique. The behavior of the valve was predicted by predicting the force acting on the valve over time. In addition, the difference in behavior according to supply pressure was compared.