• Title/Summary/Keyword: 연료소비율

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Status of Technology Standard about Fuel Consumption Measurement for HFCVs (수소연료전지자동차 연료소비율 측정방법에 대한 기술 기준 동향)

  • Lee, Hyun-Woo;Kwon, Hae-Boung;Kim, Kwang-Il;Lim, Jong-Soon;Sin, Young-Bok;Maeng, Jeong-Yeol
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.530-533
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    • 2008
  • 배출가스 및 이산화탄소 등 환경규제 강화와 에너지 고갈 문제는 기존의 내연기관, 동력전달장치, 소재 등의 성능 향상과 함께 대체에너지를 사용하는 자동차의 필요성이 증가하고 있으며, 이에 따라 수소연료전지자동차 등의 상용화가 요구되고 있다. 기존 자동차와는 패러다임이 전혀 다른 수소연료전지자동차는 현재 다양한 방향으로 연구 개발되고 있으므로 수소연료전지자동차 관련 평가기술 중 연료소비율 측정방법도 그에 따라 개발되고 진행되어야 할 것이나 현재 국내에 이와 관련한 체계적인 연구가 미미한 실정이며, 국제적인 표준도 현재 설정되어 있지 않은 상황이다. 따라서 현재까지 진행 중인 수소연료전지자동차 연료소비율 측정방법에 대한 기준 동향 및 연구 사례 조사를 통해 관련 연구 계획의 수립과 향후 수소연료전지자동차 연료소비율에 대한 평가기술 도출을 위한 기초 자료로 활용하기 위하여 본 연구를 수행하였다.

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자동차용 엔진의 연구동향

  • 이성렬
    • Journal of the KSME
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    • v.28 no.5
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    • pp.469-475
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    • 1988
  • 연료소비율의 향상은 점차 감소되어 가는 경향에 있다. 그 원인은 3원촉매변환기 채용에 의한 이론공기연료비의 사용, 기관의 연소개선이 발전하여 고압축비화에 의한 연료소비율 향상이 더 이상 어렵게 되었다는 점을 들 수 있다. 한편, 고압축비화의 역효과로는 연소실내 최고압력이 증가하여 각부의 강도나 기관 소음의 문제가 대두된다. 이들 역효과를 타파하여 충분한 연료 소비 향상을 얻을 수 있는 수단이 단기적인 과제가 될 것이다. 전자제어, 희박연소, 마찰저감 등 통상의 엔진의 개량에 대한 노력이 계속될 것이다.

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A Study on the Energy Efficiency Operational Indicator for CO2 Reduction from Ships (선박기인 CO2 저감을 위한 에너지효율 운항지표에 관한 연구)

  • Choi, Jea-Seong;Rho, Beom-Seok
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.8
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    • pp.1035-1040
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    • 2011
  • In this study, many researches have been carried out against Energy Efficiency Operational Indicator(EEOI) of existing ships under discussion by IMO. This research is examined the method for the polices about IMO's greenhouse gas reducing emissions among them, we were analyzed the EEOI for existing ships. we have analyzed the result about applying EEOI using the calculation method of the rate of fuel consumption for cargo quantities to the actual existing ships and raised the problem. Based on this research, we were presented the improved EEOI about the engine load using fuel consumption and applied the existing ships. As a result, we concluded that the improved EEOI can define a resonable rate of $CO_2$ emissions.

The Experimental Study of SOC and Measurement Results on Fuel Economy of the Hybrid Electric Vehicle (하이브리드자동차의 연료소비율 시험 시 초기 SOC와 측정결과에 대한 실험적 연구)

  • Kim, Kwang-Il;Kwon, Hae-Boung;Lee, Hyun-Woo;Lim, Jong-Soon;Shin, Young-Bok
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.534-537
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    • 2008
  • 하이브리드자동차의 연료소비율 시험 시 초기 SOC 조건에 따른 SOC와 연비 변화 특성을 파악하기 위해 2종의 차종을 선택하여 UDDS 모드주행 실험을 실시하였다. 실험결과 Strong type 자동차는 주행시작 약 550초 경과 후 SOC 52 $\sim$ 54%로 수렴하였다. 또한 일반 시가지 주행조건에서는 SOC를 50$\sim$55 % 범위에서 제어함을 알 수 있으며, 초기 SOC 조건에 따라 연비는 약 79%의 편차가 나타났다. 이는 저속구간에서 순수 전기자동차 구동이 구현됨으로써 SOC 70%에서 큰 연비 상승 효과가 나타나는 것으로 판단 된다. Mild type 자동차는 연비가 초기 SOC 조건에 따라 약 5%의 편차가 나타남을 알 수 있었으며, SOC 변화특성은 배터리 충전상태에 따라 충전량 제어는 이루어지나 가속 시 어시스트만 이루어지는 시스템적 특성상 효율적인 SOC 제어가 이루어지지 않아 연비에는 큰 영향을 주지 않는 것으로 생각된다.

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Development of Fuel Economy Measurement Method for Hydrogen Fuel Cell Vehicles (수소연료전지자동차 연료소비율 측정방법에 대한 연구)

  • Lim, Jong-Soon;Choi, Young-Tae;Yong, Gee-Joong;Kwon, Hae-Boung;Lee, Hyun-Woo;Maeng, Jeong-Yoel
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.636-639
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    • 2009
  • Fuel consumption measurement of Hydrogen fuel cell vehicle is considerably different form internal combustion engine vehicle such as carbon balance method. A practical method of fuel Consumption measurement has been developed for Hydrogen fuel cell vehicles. There are three method of hydrogen fuel consumption testing, gravimetric, PVT(Pressure, Volume and temperature), and Coriolis mass flow, all of which necessitate physical measurements of the fuel supply. The purpose of this research is to measure the fuel consumption of hydrogen fuel cell vehicles on chassis-dynamometer and to give information when the research is intended to develop method to measure hydrogen fuel consumption.

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Study on Emission Reduction with Injection Strategy and Exhaust-Gas Recirculation in Gasoline Direct Injection Engine (직접분사식 가솔린 엔진의 분사전략 변경 및 EGR 적용을 통한 배기저감에 관한 연구)

  • Park, Cheol-Woong;Kim, Hong-Suk;Woo, Se-Jong;Kim, Yong-Rae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.3
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    • pp.335-342
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    • 2012
  • Nowadays, automobile manufacturers are focusing on the reduction of exhaust-gas emissions because of the harmful effects on humans and the environment, such as global warming by greenhouse gases. Gasoline direct injection (GDI) combustion is a promising technology that can improve fuel economy significantly compared to conventional port fuel injection (PFI) gasoline engines. In the present study, ultra-lean combustion with an excess air ratio of over 2.0 is realized with a spray-guided-type GDI combustion system, so that the fuel consumption is improved by about 13%. The level of exhaust-gas emissions and the operation performance with the multiple injection strategy and exhaust-gas recirculation (EGR) are examined in comparison with the emission regulations and from the point of view of commercialization.

Comparison of characteristics between cam and electric control type of 2 stroke diesel engine for ship propulsion (캠 및 전자제어식 선박추진용 저속 2행정 디젤엔진의 성능 비교)

  • Lee, Sang Deuk;Jung, Suk Ho;Koh, Dae Kwon
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.8
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    • pp.849-854
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    • 2013
  • Many researches on green ship with increasing on economics, efficiency and convenience have been carried out consistently. One of them is development of diesel engines with electronic control. While small duty one for automobiles had been adopted mainly already, disseminating heavy duty one for ships has trouble due to safety and reliability. In order to solve these problem in this study, performance of electronic control and cam type engine installed in parallel on training ship HANBADA of korea maritime university was analyzed and compared. It is certain that specific fuel oil consumption of the electronic control type is lower than cam type and excellent at lower engine load, especially. And the electronic control type shows more effective characteristic at sea trial on specific fuel oil consumption.

The effect of heat exchanger type for exhaust heat recovery system on diesel engine performance (배기 열 회수 열교환기 형식이 디젤 엔진 성능에 미치는 영향)

  • Kim, Cheol-Jeong;Choi, Byung-Chul;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.6
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    • pp.639-647
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    • 2014
  • Due to global warming and depletion of fossil fuels, technologies reducing $CO_2$ emission and increasing fuel efficiency simultaneously are required. An exhaust gas heat recovery system is a technology to satisfy both issues. This study analyses three types of heat exchanger installed on an exhaust pipe. In case of plate type heat exchanger, back pressure rapidly increased and maximum cylinder pressure reduced in high speed and maximum load, and back pressure increased over twice and specific fuel consumption also increased up to 2% which were the highest increasing rate. In case of fin tube type, the amounts of exhaust emissions and specific fuel consumption rate were less than the other two types. The effect of shell and tube was in the middle. Making a decision by only the effect on engine performance, a fin tube type is the best for exhaust heat recovery systems.

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.