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진동내구 시험에 대한 엔진 부품 브라켓의 피로수명 해석
김남규(Namkyu Kim),최원석(Wonseog Choi),백승국(Seungkook Baik) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
The function of bracket is not only to put components on the engine but also to support it stably to maintain a regular its capacity for vehicle movement. The high performance bracket to be able to guarantee the durability for severe vibration condition is demanded by customer's quality strengthening policy. Because the variables for a design of bracket shape are very limited in order to avoid interference among components in the engine-room, a designer has been experienced many trial and error at the fist step of bracket development. The development of a stress and fatigue analysis method lately can make it possible to reduce the development cost and the time loss due to trial and error of the fist step of bracket development. Through the basis of S-N curve data for SPCC; the material of bracket, the shape design and the fatigue life expectation of bracket in the vibration test condition has been performed in this paper.
포트분사식 이륜차용 엔진의 가변밸브타이밍 및 리프트에 따른 성능특성에 관한 연구
김기봉(Kibong Kim),이기형(Kihyung Lee),백승국(Seungkook Baik),정동수(Dongsoo Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the international regulations about the exhaust emission of the motorcycle have been strengthened. Therefore, motorcycle engineers has interests in a technology that applied to automotive. The typical examples are electronic injection control system and VVT system. Among them, electronic injection control system has been studied a lot, but VVT system has not as much as others. The reasons are not only cost problem but also spacially limited space to install these systems. However VVT system has good enough value to be studied for improving engine power and decreasing emissions. That is why, in this study VVT system was applied to a electronically controlled prototype motorcycle engine using numerical analysis program "Ricardo WAVE" and also engine performance test was done experimentally to verify the numerically analyzed result. In addition steady state flow experiment was conducted to achieve intake air flux that is closely related to engine performance and efficiency.
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.
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.
전자제어식 이륜차 엔진의 연료 분사시기에 따른 증발 특성
강인보(Inbo Kang),이기형(Kihyung Lee),김용래(Yonglae Kim),백승국(Seungkook Baik) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study investigates the spray characteristics such as evaporation rate and trajectory between twin spray for the 4-hole injector which it is applied to 4-valve motorcycle gasoline engine. Three dimensional, unsteady, compressible flow and spray behavior within the port and cylinder has been simulated using the VECTIS code. The spray characteristics were investigated at 6000RPM engine speed. Furthermore, we visualized fuel behavior in the intake port by using CCD camera synchronized with the stroboscope in order to compare with simulated result. Boundary and intial conditions were employed by complete 1-D simulation of the engine using the WAVE CFD code. Fuel was injected into the port at two time interval relative to the position of the intake valves so that the spray arrived when the valves were closed and fully open. The results showed that the trajectory of the spray was directed towards the lower wall of the port with injection against the closed valves. With open valve injection, a large portion or the fuel was lifted by the co-flowing air towards the upper half of the port, this was confirmed by simulation and visualization.
[가솔린엔진부문] Bench Test에 의한 가솔린직분식 인젝터 선단면의 Deposit 누적에 대한 온도와 Ni코팅의 영향
김용태(Yongtae Kim),김병수(Byeongsoo Kim),배재일(Jaeil Bae),백승국(Seungkook Baik),최승연(Seungyeon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, gasoline direct injection (GOD engine was developed for increasing of its power, fuel economy and decreasing of engine emissions. It requires high-pressure fuel supply system because fuel is directly injected into combustion chamber with high pressure. Previous authors reported soot and deposit formation on the wall of combustion chamber and injector tip surface because of its injector exposed into combustion chamber. Specially deposit formation on the injector tip surface induced fuel spray pattern change and fuel quantity fluctuation, therefore it is generated unstable combustion.<br/> High-pressure injection injector's performance is very important because directly affect to performance of GDI engine. In this study, we tried panel coking test method for investigate of deposit accumulation on the injector tip surface<br/>
한승훈(Seunghun Han),김완기(Wankee Kim),공기재(Kijae Kong),백승국(Seungkook Baik),박성민(Seongmin Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper investigates the factors which may cause the carbon deposit at ISCA. The effect of each factor is verified through uHC concentration measurement at ISCA inlet and outlet using FRFID. As a result of test, blow-by gas emitted from the crank case passes by the ISCA during the fast acceleration and WOT mode. Finally the improved method to reduce or eliminate the root cause is proposed.
Hall IC 가변적 프로그래밍 기법을 통한 CMP 센서의 최적 조건 구현
조수만(Sooman Cho),김남일(Namil Kim),이상조(Sangjo Lee),백승국(Seungkook Baik) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
The Engine Management System(EMS) of an automobile engine is introduced to increase the engine efficiency and to reduce the exhaust emission. This system perceives engine conditions using output of sensors, so it is able to control the fuel injection and ignition timing. Especially, the camshaft position sensor provides the reference signal to detect the top dead center position of the first cylinder in compression stroke using the Hall IC. By means of combining it with a signal of the crankshaft position sensor, it is possible to achieve quick syncronization and precise control of ignition timing. In this paper, programming techniques of the Hall IC are developed by testing the magnetic flux according to the air gap.