• Journal of the korean Society of Automotive Engineers
• /
• v.14 no.3
• /
• pp.32-42
• /
• 1992

본 연구는 1차년도 사업으로 저공해 연료 및 저공해 자동차의 특성을 조사하고 국내외 저공해 연료 및 저공해 자동차의 연구개발 동향을 파악하여 문제점을 분석 정리함으로써 궁극적으로 대체연료 자동차의 실용화에 따른 자동차 연료의 다원화 및 탈석유화 실현에 공헌하고자 한다.

• Journal of the korean Society of Automotive Engineers
• /
• v.9 no.4
• /
• pp.23-34
• /
• 1987

연소 기관용 연료의 효율적 이용과 연소 효율 향상을 위한 연소 기술의 개발에 더욱 노력을 경주 하여야 한다. 이러한 관점에서 연소 기술의 개발과 더불어 새로운 대체연료에 관한 연구가 더욱 활발히 이루어 져야 할 것으로 생각된다. 그러므로 여기서는 대체 연료로 기대되는 석탄액화유, 알코올연료, 태양에너지 중에서 연소 기관용 연료로 주목되고 있는 알코올연료의 특성과 연소 기관의 적용성과 그 문제점에 대하여 살펴 보기로 한다.

• Journal of Energy Engineering
• /
• v.17 no.4
• /
• pp.227-232
• /
• 2008

Carbon dioxide is considered a major greenhouse gas that contributes to global wanning. $CO_2$ is a major component of the exhaust in the combustion of any hydrocarbon fuel. The regulation for $CO_2$ emission from vehicles has become much more stringent in recent years. These more stringent regulations require vehicle manufacturers to develop alternative fuels that reduce exhaust emissions. This paper evaluated the correlation of $CO_2$ emission and fuel economy in the Gasoline, Diesel, and LPG vehicles according to FTP-75 and NEDC(ECE15+EUDC) driving mode. From this study, we discovered that the decrease rate of $CO_2$ emission is higher for fuels of lower carbon concentration. When the relationship between $CO_2$ emission and fuel consumption rate according to used fuels is expressed as a function, one can find out that they have a high correlation. LPG vehicles produce less $CO_2$ emission than gasoline and diesel vehicles.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.5
• /
• pp.145-150
• /
• 2013

Recently, many vehicles have applied electric parts for saving fuel consumption and reducing levels of environmental pollution. ISG (integrated starter & generator) is one of main electric parts and can improve fuel efficiency by using idle stop & go function and regenerative braking system. However, if ISG driving inverter works under the continuously high load condition, it will make the performance and durability of the inverter decreased with rising temperature. In this study, we carried out the analysis on the fluid flow and thermal characteristics of the inverter. As a result, we found the MOSFET of the air cooled inverter was increased up to $116^{\circ}C$ over the limit temperature. On the other hand, the liquid cooled type inverter's MOSFET was decreased by about $17^{\circ}C$ compared to that of the air cooled inverter. Therefore, we verified the feasibility of the liquid cooled type using the present cooling structure.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.23 no.1
• /
• pp.34-40
• /
• 2015

A stack in the proton exchange membrane fuel cell (PEMFC) consists of bipolar plates, a membrane electrode assembly, a gas diffusion layer, a collector and end plates. High current density is usually obtainable partially from uniform temperature distribution in the fuel cell. A size optimization method considering the thermal expansion effect of stacked plates was developed on the basis of finite element analyses. The thermal stresses in end, bipolar, and cooling plates were calculated based on temperature distribution obtained from thermal analyses. Finally, the optimization method was applied and optimum thicknesses of the three plates were calculated considering both fastening bolt tension and thermal expansion of each unit cell (72 cells, 5kW). The optimum design considering both thermal and mechanical loads increases the thickness of an end plate by 0.64-0.83% the case considering only mechanical load. The effect can be enlarged if the number of stack increases as in an automotive application to 200-300 stacks.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2012.05a
• /
• pp.933-934
• /
• 2012

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.12 no.3
• /
• pp.41-47
• /
• 2013

This study was carried out to improve the design of fuel injection nozzle for marine medium speed diesel engine. For this purpose, fuel injection nozzle was modeled and simulated using CATIA V5R19 and FLUENT & MSC Nastran. Analyses of flow and heat transfer, respectively, were performed to find the optimal design of fuel injection nozzle. As the results, big pressure drop, which may lead to cavitation damage, was occurred at inlet of fuel injection hole with diameter 0.3mm. Furthermore, it was confirmed that the increase of mean temperature of fuel injection nozzle was almost a half in comparison with that of fuel injection nozzle tip.

• Journal of the korean Society of Automotive Engineers
• /
• v.3 no.3
• /
• pp.8-13
• /
• 1981

종래 자동차용 엔진유에 요구되었던 주요기능으로서는 마찰부위에서 발생되는 마찰저항이나 마 모를 감소시키는데에 국한하여 연구개발되어 왔었지만 12973년의 석유의기를 계기로 하여 이와 같은 기능외에도 소비에너지를 최소화 할려는 노력의 일환으로서 연비절약형의 엔진유는 물론 내구서어이 양호한 롱라이프(long life)유가 등장되었을뿐만 아니라 날로 심각해져가고 있는 자 동차배기가스에 의한 대기오염과도 적합성을 고겨한 새로운 기능의 엔진유가 개발됨에 따라 이와 관련하여 자동차엔지유를 통해본 연료비절감효과와 그 문제점을 검토해 보고자 한다.

• Transactions of Materials Processing
• /
• v.11 no.4
• /
• pp.295-301
• /
• 2002

Recently, design concepts of vehicle will have to consider the safty and economy of fuel consumtion. The hydroforming technology has applied to increase strength, and to decrease weight, cost and part count. The hydroforming has been recognized as general technique in automotive industry. This paper deals with the trends of automotive application of hydroforming, new hydroforming technologies, facilities.

• Journal of the korean Society of Automotive Engineers
• /
• v.26 no.3
• /
• pp.21-25
• /
• 2004

연료전지의 종류는 전해질의 종류로 나누는 것이 일반적으로, 운전 및 정지를 반복하는 자동차용에는 작동 온도까지 상변화가 없는 고체 전해질이 유리하다고 할 수 있는데 프로톤 교환막과 고체산화물이 바로 그것이다. 프로톤 교환막 연료전지는 다른 종류의 연료전지 보다 작동온도가 8$0^{\circ}C$ 내외로 낮고, 단위전지 면출력밀도가 커서 현재 자동차용으로 가장 많이 개발되고 있다. 그 결과 자동차 구동에 적당한 80㎾급의 연료전지 스택이 자동차에 장착될 수 있는 크기로 개발되어 적용되고 있다. (중략)