• Title/Summary/Keyword: LPG 엔진

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Development of an LPG Engine for Medium-Duty Commercial Vehicles (중형상용차량용 LPG엔진의 개발에 관한 연구)

  • Seo, Young-Ho;Kang, Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.5
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    • pp.1-11
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    • 2000
  • This study is aimed to develop a proto-type LPG engine for medium-duty commercial vehicles in order to substitute for conventional diesel engine. Recently, it is recognized that diesel engines are main cause for smoke pollution in urban site. So, it is expected to reduce this environmental emission by developing and substituting LPG engine which has the advantage of practical use in a short development period in aspects of infrastructures. For that, after analysing the specifications and performance characteristics of a base diesel engine, parts of combustion chamber, intake system, fuel supply and ignition systems suitable for LPG combustion were re-designed and manufactured. And and engine controller for fuel supply and ignition distributions was matched by feedback mapping based on the speed-load conditions. The torque and power of LPG engine were increased by 6∼12% on the overall driving conditions compared to the base diesel engine, and fuel consumption rate marked the similar level based on the fuel price. Exhaust emissions such as THC, CO, NOx recorded the same order with conventional LPG engine for passenger car.

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An Study on Spray and Combustion Characteristics of Direct Injection LPG under Low Pressure Injection Condition (저압 분사조건에 따른 직접분사 LPG의 분무 및 연소특성 연구)

  • Hwang, Seong-Ill;Chung, Sung-Sik;Yeom, Jeong-Kuk;Lee, Jin-Hyun
    • Journal of the Korean Institute of Gas
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    • v.20 no.1
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    • pp.52-61
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    • 2016
  • Liquefied petroleum gas is regarded as a promising alternative fuel as it is eco-friendly, has good energy efficiency and output performance, practically and has high cost competitiveness over competing fuels. In spark-ignition engine, direct injection technology improves engine volumetric efficiency apparently and operates engine using the stratified charge that has relatively higher combustion efficiency. This study designed a combustion chamber equipped with visualization system by applying gasoline direct injection engine principle. In doing so, the study recorded and analyzed ignition probability and flame propagation process of spark-ignited direct injection LPG in a digital way. The result can contribute as a basic resource widespread for spark-ignited direct injection LPG engine design and optimization extensively.

Influence of Compression Ratio on Engine Performance in a LPG Engine Converted from a Diesel Engine (디젤엔진을 개조한 LPG엔진의 기관성능에 미치는 압축비의 영향)

  • Choi Gyeung Ho;Kim Jin Ho;Chung Yon Jong;Han Sung Bin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.10
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    • pp.1178-1183
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    • 2004
  • The purpose of this study was to investigate the influence of compression ratio on engine performance in a LPG(Liquefied Petroleum Gas) engine converted from a diesel engine. In ordor to determine the ideal compression ratio, a variable compression ratio 4-cylinder engine was developed. Retrofitting a diesel engine into a LPG engine is technically very complicated compared to a gasoline to LPG conversion. The cylinder head and the piston crown were modified to bum LPG in the engine. Compression ratios were increased from 8 to 10 in an increment of 0.5, the ignition timing was controlled to be at MBT(Minimum Spark Advance for Best Torque) for each case.

Performance and Emission Characteristics of Liquid-Phase LPG Injection Engine with Different EGR Rate (EGR율 변화에 대한 액상 LPG분사 엔진의 운전 및 배출가스특성)

  • 염기태;우영민;장진영;박용국;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.7-14
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    • 2003
  • Exhaust Gas Recirculation (EGR) system is used to reduce NOx emission, to improve fuel economy, and to suppress knock since it offers the benefits of the inlet charge dilution. The effects of EGR was investigated on the performance and emission to reduce exhaust thermal load with a single cylinder liquid-phase LPG injection engine, in a wide range of EGR rate, engine conditions and LPG proportions. As EGR rate was increased, NOx was reduced while HC was increased. Pumping loss reduction by EGR improved bsfc and increased EGR lowered exhaust gas temperature. And, LPG proportions were made a difference on the performance and emission characteristics.

Injector Control Logic for a Liquid Phase LPG Injection Engine (액상 LPG 분사 엔진의 인젝터 제어 로직)

  • 조성우;민경덕
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.15-21
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    • 2003
  • The liquid phase LPG injection engine is a new technology to make good use of LPG as a clean energy. However, it is difficult to precisely control air/fuel ratio in the system because of variation of fuel composition, change of temperature and flash boiling injection mechanism. This study newly suggests an injector control logic for liquid phase LPG injection systems. This logic compensates a number of effects such as variations of density, stoichiometric air/fuel ratio, injection delay time, injection pressure, release pressure which is formed by flash boiling of fuel at nozzle exit. This logic can precisely control air/fuel ratio with only two parameters of intake air flow rate and injection pressure without considering fuel composition, fuel temperature.

Combustion Characteristics Study of an SI Engine Operated with DME Blended LPG Fuel (LPG-DME 혼합연료를 사용하는 전기점화 기관의 연소특성 연구)

  • Lee, Seok-Hwan;Oh, Seung-Mook;Choi, Young;Kang, Kern-Yong;Choi, Won-Hak;Cha, Kyoung-Ok
    • Journal of the Korean Institute of Gas
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    • v.12 no.3
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    • pp.7-12
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    • 2008
  • In this study, a spark ignition engine operated with the DME blended LPG fuel was investigated experimentally. Performance, emissions characteristics including hydrocarbon, CO, NOx, and combustion stability of an SI engine fuelled with DME blended LPG fuel were examined at $1200{\sim}5200\;rpm$. Results showed that stable engine operation was possible for a wide range of engine loads within 20% mass content of DME fuel. Also, engine output power within 10% mass content of DME fuel was comparable to that of pure LPG fuel operation. However, engine output power was decreased and break specific fuel consumption (BSFC) was severely increased with the amount of blended fuel as the energy content of DME was much lower than that of LPG. DME blended LPG fuel is expected to be potential for enlarging DME market.

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The Development of the Ignition Spark Timing Conversion System for LPG/Gasoline Bi-fuel Vehicle (LPG 및 Gasoline 겸용 차량의 엔진 점화시기 변환 제어시스템 개발)

  • 전봉준;양인권;김재국;김성준
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.1
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    • pp.117-123
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    • 2003
  • In a bi-fuel engine using gasoline and LPG fuel, with the current ignition timing for gasoline being used, the effective performance could not be taken in LPG fuel supply mode. The ignition timing in LPG fuel mode must be advanced much more than that of gasoline mode for the compensation of its lower flame speed, due to engine torque drop. This study aims to develop the control system for ignition spark timing conversion which is composed of hardwares and control algorithm for gasoline/LPG engine. We propose the control system which can advance the ignition spark timing in LPG fuel mode more than used in gasoline fuel mode. The advance of ignition timing is achieved by change of the ignition dwell time of coil igniter. The engine torque and F/E(Fuel-Economy) in LPG fuel mode are measured to evaluate the difference of engine performance between before and alter changing ignition spark timings. The engine torque and F/E are increased respectively, which proves the developed control system is effective so much for gasoline and LPG bi-fuel engine.

Study of Combustion Characteristics with Compression Ratio Change in Ultra-Lean LPG Direct Injection Engine (압축비 변화에 따른 초희박 직접분사식 LPG엔진의 연소특성 연구)

  • Cho, See Hyeon;Yoon, Jun Kyu;Park, Cheol Woong;Oh, Seung Mook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.10
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    • pp.837-844
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    • 2014
  • Automotive manufacturers have recently developed various technologies for improving fuel economy and satisfying enhanced emission regulations. The ultra-lean direct injection engine is a promising technology because it has the advantage of improving thermal efficiency through the deliberate control of ignition. A conventional LPG engine has been redesigned to an ultra-lean-burn LPG direct injection engine in order to adopt combustion system of ultra-lean-burn. This study is aimed at investigating the effect of a change in the compression ratio on the performance and emission characteristics of a lean-burn LPG engine. The fuel consumption, heat release rate, combustion pressure, and emission characteristics are estimated depending on changing the effect of compression ratio. When the compression ratio is increased, it is difficult to improve the fuel consumption owing to an unstable combustion state, but the total hydrocarbon and nitrogen oxide emissions are reduced.

Applicability to Gas Engine and Small Sized Generator of Low Caloric Synthetic Gas Fuel from Coal Gasification (저발열량 석탄가스화연료의 가스엔진 및 소형발전기 적용연구)

  • Kim Tae-Kwon;Kim Sung-Roon;Jang Jun-Young
    • Journal of the Korean Institute of Gas
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    • v.10 no.3 s.32
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    • pp.1-6
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    • 2006
  • This paper presents the applicability of low caloric synthetic gas from coal gasification to a gas engine system and small sized generator. A commercial LPG engine is modified to use the low caloric synthetic gas from coal gasification as the gas engine fuel. The modification is focused on the fuel supplying system, which includes air flowrate adjusting orifice, gas mixer, vaporizer, preheater, regulators, and fuel tank. From the results of engine performance data, we have demonstrated that the engine modified by using the coal gasification gas is well operated from idle to wide open throttle conditions although the engine power is somewhat reduced relative to LPG fueled engine. And we have also demonstrated that the generator is well operated with various loads.

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Lean Burn Characteristics in a Heavy Duty Liquid Phase LPG Injection SI Engine (대형 액상분사식 LPG 엔진의 희박연소특성에 관한 연구)

  • 오승묵;김창업;강건용;우영민;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.4
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    • pp.1-11
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    • 2004
  • Combustion and fuel distribution characteristics of heavy duty engine with the liquid phase LPG injection(LPLI) were studied in a single cylinder engine, Swirl ratio were varied between 1.2, 2.3, and 3.4 following Ricardo swirl number(Rs) definition, Rs=2.3 showed the best results with lower cycle-by-cycle variation and shorter burning duration in the lean region while strong swirl(Rs=3.4) made these worse for combustion enhancement. Excessive swirl resulted in reverse effects due to high heat transfer and initial flame kernel quenching. Fuel injection timings were categorized with open valve injection(OVI) and closed valve injection(CVI). Open valve injection showed shorter combustion duration and extended lean limit. The formation of rich mixture in the spark plug vicinity was achieved by open valve injection. With higher swirl strength(Rs=3.4) and open valve injection, the cloud of fuel followed the flow direction and the radial air/fuel mixing was limited by strong swirl flow. It was expected that axial stratification was maintained with open-valve injection if the radial component of the swirling motion was stronger than the axial components. The axial fuel stratification and concentration were sensitive to fuel injection timing in case of Rs=3.4 while those were relatively independent of the injection timing in case of Rs=2.3.