• Title/Summary/Keyword: LPG 엔진

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Feasibility Test of LPG Vehicles by Using DME-LPG Blends (DME-LPG 혼합연료를 사용한 LPG 차량의 실증평가)

  • Youn, Jumin;Lee, Minho;Park, Cheonkyu;Hwang, Inha;Ha, Jonghan;Kang, Yong
    • Journal of Energy Engineering
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    • v.24 no.4
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    • pp.33-41
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    • 2015
  • Dimethyl ether (DME) can be used as a clean diesel alternative fuel due to the high cetane number and low emission, it can also be applied to automotive fuel as a blended liquefied petroleum gas (LPG) because physical properties are similar to those of LPG. In this study, feasibility test of LPG vehicle using blended DME-LPG fuel was investigated. Three types of fuel supply such as LPLi (Liquid phase LPG injection), LPGi (Liquid phase gas injection) and mixer type were selected to consider the LPG fuel-injection system. The performance characteristics of LPG vehicle were examined by using LPG and blended DME-LPG fuel in order to compare the exhaust emissions (CO, THC, $NO_X$) and fuel economy. The emissions and fuel economy of DME-LPG blend fuel were comparable to those of LPG with increasing driving distance.

LPG/CNG Interface Box Hardware Design (LPG/CNG Interface Box 제품 Hardware 설계)

  • An, Jeong-Hoon;Jung, Jae-Min
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.6
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    • pp.23-29
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    • 2007
  • In Korea, the number of LPG vehicles is increasing continuously because LPG is cheaper than Gasoline. Also in Europe, the CNG fuel is a good solution to meet $CO_2$ regulation. In order to use LPG/CNG fuel, new EMS ECU must be developed for every type of vehicles and it requires huge development cost. In order to reduce development cost and time, SIEMENS VDO has developed an Interface Box. It supports EMS ECU in the car and manages LPG/CNG fuel injection system. Basically the Interface box can be used with any kind of EMS ECU. The Interface Box controls LPG/CNG injector through the injection command of gasoline EMS ECU. It calculates required amount of based on the fuel temperature and pressure and sends feedback signal to ECU for fuel correction. Also, it controls LPG/CNG specific actuator such a Shut off valves and LPG switch inputs.

A Study on the Combustion Characteristics and the Control on the Fuel Flow Rate of LPG Intake Port Injection Engine (흡기포트 분사식 LPG 엔진의 연료량 제어 및 연소 특성에 관한 연구)

  • 김우석;이종화;정창현
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.6
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    • pp.31-39
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    • 2000
  • In this paper, characteristics of a port injection type LPG fuel system were investigated to adopt the system to a spark ignition engine through rig test. Engine combustion characteristics for limited conditions and the precise control method of LPG fuel supply were also studied. As a basic experiment, the effects and the relationships of parameters such as orifice area, fuel delivery pressure, fuel temperature and flow coefficient were established. From this, one dimensional compressible flow equation can be applied to control gaseous fuel flow rate by setting pressure difference between vaporizer and manifold to a certain range, for example about 1.2 bar in a naturally aspirated engine. The combustion analysis results of LPG engine were also compared with those of gasoline engine according to spark timing and load change. At part load and stoichiometric condition, the MBT spark timing of LPG fueled engine is retarded by 2$^{\circ}$ - 4$^{\circ}$CA compared to that of gasoline engine. On the contrary, the spark timing of LPG fueled engine can be advanced by 5$^{\circ}$- 10$^{\circ}$ CA at WOT, which results from higher Octane Number and burned fraction of LPG fuel compared to gasoline.

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Fuel Stratification Effects of LPG-DME Compression Ignition Engine (LPG-DME 압축착화 엔진의 성층화 영향)

  • Yeom, Ki-Tae;Bae, Choong-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.1
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    • pp.78-85
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    • 2008
  • The exhaust emission characteristics of a liquefied petroleum gas-di-methyl ether (LPG-DME) compression ignition engine was investigated under homogeneous charge, stratified charge and diffusion combustion conditions. LPG was used as the main fuel and injected into the combustion chamber directly. DME was used as an ignition promoter and injected into the intake port. Different LPG injection timings were tested to verify the combustion characteristics of the LPG-DME compression ignition engine. The combustion was divided into three region which are homogeneous charge, stratified charge, and diffusion combustion region according to the injection timing of LPG. The HC emission was reduced with LPG stratification. However, the carbon monoxide and particulate matter emissions were increased. The ignition timing was advanced with LPG stratification. This advance combustion was because of charge temperature and cetane number stratification with LPG.

The Effect of N-butane and Propane on Performance and Emissions of a SI Engine Operated with LPG/DME Blended Fuel (LPG/DME 혼합연료를 사용하는 전기점화 기관에서 LPG 성분이 엔진 성능 및 배기특성에 미치는 영향)

  • Lee, Seok-Hwan;Oh, Seung-Mook;Choi, Young;Kang, Kern-Yong;Choi, Won-Hak;Cha, Kyoung-Ok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.35-42
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    • 2009
  • In this study, a spark ignition engine operated with LPG and DME blended fuel was studied experimentally. The effect of n-butane and propane on performance and emissions of a SI engine fuelled by LPG/DME blended fuel were examined. Stable engine operation was achieved for a wide range of engine loads with propane containing LPG/DME blended fuel compare to butane containing LPG/DME blended fuel since octane number of propane was much higher than that of butane. Also, engine output operated with propane containing blended fuel was comparable to pure LPG fuel operation. Engine output power was decreased and break specific fuel consumption (BSFC) was increased with the blended fuel since the energy content of DME was much lower than that of LPG. Considering the results of engine output power, bsfc, and exhaust emissions, the propane containing LPG/DME blended fuel could be used as an alternative fuel for LPG.

An Experimental Study on Engine Performance of LPG/Gasoline Bi-Fuel (LPG/가솔린 Bi-Fuel 엔진성능에 관한 실험적 고찰)

  • Jun, Bong-Jun;Park, Myung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1433-1438
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    • 2009
  • The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. We propose the control system which can advance the ignition spark timing in LPG fuel mode more than used in gasoline fuel mode. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000) and the ignition timing advance($5^{\circ}$,$10^{\circ}$,$15^{\circ}$,$20^{\circ}$) As the result, between 1500rpm and 2000rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at $20^{\circ}$was smaller value. Also, the heat release rate at 1500rpm was increased but it was lower around $20^{\circ}$at 2000rpm.

Various Injection Conditions and Fuel Control of an LPG Liquid Injection Engine (다양한 분사조건과 LPG 액상분사엔진의 연료량 제어)

  • Sim Hansub
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.1
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    • pp.28-35
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    • 2005
  • Fuel injection rate of an injector is affected by various injection conditions such as injection duration, fuel temperature, injection pressure, and voltage in LPG liquid injection systems for either a port-fuel-injection(PFI) or a direct injection(DI) in a cylinder. Even fuel injection conditions are changed, the air-fuel ratio should be accurately controlled to educe exhaust emissions. In this study, correction factor for the fuel injection rate of an injector is derived from the density ratio and the pressure difference ratio. A voltage correction factor is researched from injection test results on an LPG liquid injection engine. A compensation method of the fuel injection rate is proposed for a fuel injection control system. The experimental results for the LPG liquid injection system in a SI-engine show that this system works well on experimental range of engine speed and load conditions. And the fuel injection rate is accurately controlled by the proposed compensation method.

Development of Flow Rate Model of a Liquid Phase LPG Injector (액상 LPG 인젝터의 유량 모델 개발)

  • 조성우;민경덕
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.22-28
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    • 2003
  • Flash boiling mechanism in the injector interferes with fine fuel metering in a liquid phase LPG injection engine. This study presents a mathematical model to precisely predict an injection quantity. A calibration procedure of injection quantity, which is very prompt and precise in measuring, is developed using a gas analyzer. According to this procedure, injection quantity can be obtained under various fuel compositions, temperatures and injection pressures. The release pressure of liquid phase LPG is estimated based on these experimental data. Although the release pressure is much lower than the saturation pressure, it is linearly proportional to the saturation pressure.

A Study of CO2 Emission Characteristics on the Vehicle with LPG Direct Injection and Mild Hybrid System (LPG 직분사 엔진과 마일드 하이브리드 시스템 적용 차량의 CO2배출 특성 연구)

  • An, Young kuk;Byeonggyu, Yang;Jinil, Park
    • Journal of ILASS-Korea
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    • v.27 no.4
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    • pp.211-218
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    • 2022
  • Recent vehicle regulations have become increasingly stringent in order to reduce greenhouse gases. Then not only movement to replace internal combustion engine vehicles with hybrid vehicles, but also studies of replacing internal combustion engine fuels with low-pollution fuels are increasing. In this study, the characteristics of a vehicle with LPG fuel engine and mild hybrid system is investigated. To avoid shortage of maximum power on LPG engine, a direct injection system of LPG is applied. In addition, P0 mild hybrid system is adopted to enhence the efficiency of the vehicle. The vehicle model is developed in order to predict fuel economy and CO2 emission of LPDi MHEV.