• 한국신재생에너지학회:학술대회논문집
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• 2008.05a
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• pp.513-513
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• 2008

• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.113-113
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• 2000

LPG 및 석유류는 온도에 따라서 유량의 변화가 LPG의 경우는 ±0.23%/℃, 무연은 ±0.11%/℃, 등유는 ±0.10%/℃, 경유의 경우는 ±0.09%/℃로 특히 LPG의 경우가 그 변화가 심하므로 정확한 충전량을 계량하는 것이 중요하다. 이는 공정거래 확립의 차원에서 공급자와 소비자 입장에서 반드시 요구되는 사항이다. 이를 위해 본 논문에서는 LPG 충전기의 충전제어 및 자동 온도 보정의 알고리즘을 개발하고 이를 프로그래밍한 후 온도센서와 16-bit 마이크로프로세서(intel 80C196)로 자동 온도 보정이 가능한 LPG 충전기의 충전제어 시스템을 설계 및 제작하였다. 설계 제작된 시스템은 프로세서부, I/O 입ㆍ출력부, VFD(vacuum fluorescent display) 디스플레이 구동부로 구성된다. 충전제어 동작은 LPG 유량계의 encoder로부터의 유량(유속)신호와 기차 보정값 및 15℃를 기준으로 한 온도 센서부의 온도 보정값을 입력받아 솔레노이드 밸브를 제어하여 충전을 제어하게 된다. 온도 보정은 80C196 프로세서의 내부 10-bit A/D 변환기를 사용하여 0.5℃ 분해능으로 온도제어를 할 수 있다. VFD 디스플레이는 유량, 금액, 단가가 표시되며 그 값을 누적시켜 일계, 월계를 알 수 있게 하였다. 그 외에 시스템 진단기능 및 컴퓨터통신, POS 통신이 가능하도록 하였다. 제작된 시스템을 LPG 충전기에 실장하여 시험한 결과 목표한 정확도로 유량이 제어됨을 알 수 있었다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.33 no.4
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• pp.272-277
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• 2009

The liquid phase LPG injection (LPLi) system (the 3rd generation technology) has been considered as one of the most promising fuel supply systems for LPG vehicles. To investigate the reaction characteristics of LPG with rubber parts in LPLi system, various rubbers were tested. The results showed that the amount of residue from the cover rubber of a fuel pump was increased about 10 times after testing. Furthermore, the amount of sulfur and nitrogen species which are considered as main sources of deposit formation in LPLi fuel injectors were also found to be higher than those in original LPG fuel. In addition, these residues made the core parts of LPLi injector such as needle and nozzle, partially worn, which eventually causes leakage in LPLi injectors.

• Journal of the Korean Institute of Gas
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• v.16 no.6
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• pp.23-28
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• 2012

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.

• Journal of ILASS-Korea
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• v.12 no.2
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• pp.94-100
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• 2007

The liquid phase LPG injection (LPLi) system (the third generation technology) has been considered as one of the next generation fuel supply systems for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type (the second generation technology) fuel supply system. To investigate the characteristics of LPG residue in liquid phase LPG injection system, various rubbers in LPG fuel system were reacted with LPG fuels during 3 months. The experimental results showed that the residue of a cover rubber in a fuel pump after test increased 10 times higher than that before test. Furthermore, the amount of sulfur, nitrogen species which are considered as main sources in deposit formation in the LPLi fuel injector were also found to be higher than that in original LPG fuel. And rubber properties of fuel pump cover were decreased after reaction test compared with those of the original rubber. Therefore, the rubber for fuel pump cover is not suitable for a proper material in LPLi fuel system. And these results can provide more information if a motor company shares the data of core rubber parts in field test LPLi vehicles.

• The Safety technology
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• no.172
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• pp.62-63
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• 2012

• Journal of Energy Engineering
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• v.21 no.3
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• pp.301-308
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• 2012

This paper attempts to estimate the demand function for the transport LPG and to analyze long-run and short-run price and income elasticities. In addition, the paper measures consumer surplus and economic value ensuing from the transport LPG consumption by utilizing the estimated long-run price elasticity. The price and the income data are the monthly real transport LPG price and the monthly composite index adjusted by real transport LPG price from 2003 to 2012. Unit root test, co-integration test and error correction model are to take the procedure of estimation of demand curve. The demand for transport LPG is considered to be inelastic and the long-run demand is more elasticity than that of short-run. Price elasticity of demand estimate here is -0.422, and the estimated consumer surplus and economic value in 2010/03 are 966 and 1,781 billion won, respectively.

• Journal of the Institute of Convergence Signal Processing
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• v.3 no.2
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• pp.83-88
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• 2002

In this paper, a POS interfacing and temperature compensable LPG dispensing control system(LDCS) has been developed. A LDCS includes a 16-bit 80C196 microprocessor, RAM, ROM, video driver, and programmable peripheral devices. Based on gas flow encoding pulse, temperature-voltage conversion values and apparatus calibration values, the LDCS controls the LPG dispensing quantity with switching on or off the solenoid valves. The temperature compensation is performed with a 10-bit A/D conversion and its range is from +7$0^{\circ}C$ to -3$0^{\circ}C$ with a 0.5$^{\circ}C$ resolution.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.32 no.12
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• pp.907-914
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• 2008

This study is mainly focused on the assessment of return, semi return, and returnless fuel supply system for an LPi engine. In order to compare the return type with returnless one with various LPG blends, combustion analysis and cyclic THC emission characteristic were tested at the part load operating condition of the LPi engine. Considering heat balance of each fuel supply systems, pressure and temperature increment of return type showed lower at the fuel rail during idle warm up operation. However, those of returnless type at LPG tank maintained stable and slow increment because the heat transfer from the LPi engine was minimized. Finally, hot restartability of each fuel supply systems were evaluated with the various LPG blends and fuel temperatures. As a result, semi return type has equivalent performance to return type considering combustion and emission characteristic, hot restartability performance for LPi engine.

• LP가스
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• s.82
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• pp.44-62
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• 2002

지난 2월20일 LPG수입양사와 우리회가 한국환경정책평가연구원과 연구용역계약을 체결했던 "저공해차량의 균형보급방안 연구"에 대한 최종 결과가 나와 요약분을 제기한다.