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[디젤엔진부문] 대형 단기통 디젤엔진에서 Mixer 방식과 LPi 방식에 따른 연소 및 배출가스 특성에 관한 연구
김진호(jinho Kim),정연종(yonjong Chung),최경호(gyeungho Choi),이상준(sangjun Lee),이병호(byungho Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The purpose of the study is analyzing combustion and emission characteristic in Heavy-duty SCDE (Single Cylinder Diesel Engine) with Mixer and LPi(Liquid propane injection) system. The Mixer and LPi system provides LPG in vapor and liquid phase throughout intake manifold. Sensors such as crank shaft position sensor (CPS) and hall sensor supply spark and injection timing data to the ignition controller. SCDE runs with engine speed of from 800 to 1400rpm, CR of 8, λ value 0.8 ~ 1.3. The major conclusions of this work include i) LPi and Mixer system are similar to BSFC as 275g/kw-h. ii) It is shown CO emissions are lowered as value is increased in rich condition.
[디젤엔진부문] 개조된 디젤 LPG엔진에서 부탄 및 프로판연료의 연소특성 연구
조웅래(Unglae Cho),정연종(yonjong Chung),최경호(Gyeungho Choi) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The purpose of this study was to investigate characteristics of combustion and exhaust gas temperature with butane and propane fuel in LPG conversion engine from diesel. A conventional diesel engine was modified to a LPG(Liquified Petroleum Gas) engine that LPG fuel system was set instead of diesel fuel injection pump. Study was performed with different compositions of butane and propane such as butane 100%, propane 100%, .butane 50% propane 50%, butane 70% - propane 30% and butane 30% - propane 70% fuel blends. The major conclusion of this work include; (i) MET spark ignition timing was same with different butane/propane fuel blends except butane 1000/0, 1200 rpm condition. (ii) engine torque and power were not influenced by varied butane/propane fuel blends. (iii) finally, exhaust gas temperature was increased by higher engine speed, it also was decreased by maximum 15℃ with different butane/propane fuel blends.<br/>
조웅래(Unglae Cho),권태윤(Taeyun Kwon),정연종(Yonjong Chung),최경호(Cyeungho Choi) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The purpose of this study was to investigate reduction of exhaust gas temperature in LPG engine. A conventional diesel engine was modified to a LPG(Liquified Petrolewn Gas) engine that LPG fuel system was set instead of diesel fuel injection pump. The research was performed with measure of exhaust gas temperature by varying spark ignition timing. The ignition timing was changed by ECU that was new designed and fabricated for controlling spark ignition timing. The major conclusion of this work include; ( i ) exhaust gas temperature was decreased and power was increased with the advanced spark ignition timing. (ii) exhaust gas temperature was more decreased with controled spark ignition timing by ECU at mid-ranged engine speeds comparing with mechanical distributor.
LPi엔진의 인젝터 연료누출이 엔진성능에 미치는 영향에 관한 연구
신성근(Seongkeun Shin),이주희(Juhee Lee),최경호(Gyeungho Choi),정연종(Yonjong Chung) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
To follow the continually and gradually fortifying regulations for the leakage of noxious emission, the low-pollutant LPG, as fuel, rs becoming popular by days. LPi engine has better ability to excrete the exhaust gas because when the LPG is being injected to the suction port, the suction air's temperature drops by the process of potential heat. However the pressured fuel remains inside the fuel line after the engine rums off and flows into the tiny gaps of the injector. This remaining fuel creates a thick compound of gases in the intake manifold which lowers the efficiency when the engine starts. It is expected that the unburned gas will be exposed and increase the amount of harmful gas in the air. Therefore in this experiment, the basic data to research how the leaking fuel from the LPi engine affects the engine's starting ability is provided. The result of the experimentation for the critical point of the Injector leakage was 21L and the 14th cycle for the starting cycle. Also when 1 ~6L of fuel is leaked, the starting cycle increases to 3rd~7th cycle in a shape of a fan, and the discharge of HC with it as well. The engine started faster when 0.2L of fuel is leaked in the testing for leakage of less than 1L, but as the amount of fuel transpiration increased, the HC emission did the same.