• Journal of Advanced Marine Engineering and Technology
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• v.41 no.3
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• pp.216-221
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• 2017

Diesel engines have the highest brake thermal efficiency among internal combustion engines. Therefore, they are utilized in medium and large transportation vehicles requiring large amounts of power such as heavy trucks, ships, power generation systems, etc. However, diesel engines have a disadvantage of generating large quantities of nitrogen oxides during the combustion process. Therefore, the authors tried to reduce the amount of nitrogen oxides in marine diesel engines using a wet-type exhaust gas cleaning system utilizing the undivided electrolyzed seawater method. In this method, electrolyzed seawater in injected into the harmful gas discharge from the diesel engine using real seawater. The authors investigated the reduction of NO and NOx from the pH value, available chlorine concentration, and the temperature of electrolyzed seawater. The results of this experiment indicated that when the electrolyzed seawater is acidic, the NO oxidation rate in the oxidation tower is higher than that when the electrolyzed seawater has a neutral pH. Likewise, the NO oxidation rate increased with the increase in concentration of chlorine. Further, it was confirmed that the electrolyzed seawater temperature had no effect on the NO oxidation rate. Thus, the NOx exhaust emission value produced by the diesel engine was reduced by means of electrolyzed seawater treatment.

• Journal of the Korean Society of Safety
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• v.12 no.3
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• pp.17-22
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• 1997

This paper reals with the structure and function of duel mass flywheel. Damping effects of engine rotational fluctuation are compared with those of pre-damper clutch and duel mass flywheel and driven- system behavior is estimated engine idle r.p.m. The reason of gear rattle noise is higher in summer than winter and driving longer period than initial driving is due to affection by drag torque changing. The above-contents can be used on the design of clutch system and transmission matching including engine and duel mass flywheel.

• Korea Petroleum Association Journal
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• s.287
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• pp.59-64
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• 2012

금년초부터 지식경제부의 발주로 한국석유관리원(이하 석관)에서 RFS(신재생연료의무보급제도) 국내 도입방안 연구를 수행중에 있으며, 연료업계, 지동차업계, 전문가 등이 참여하는 TF가 구성 운영되고 있다. 이미 2007 년부터 바이오디젤 0.5%가 자동차용경유에 혼합되어 사용되고 있는 가운데, 지경부에서는 신재생에너지법 상에 동 제도를 담아 고시가 아닌 법의 형태로 운용하려는 계획을 갖고 있다. 또한, 국회 지경위에서도 RFS 제도 시행 법안이 논의되었으나 계류된 바 있다. 국내 전체 차량이 1,870만대에 달하고 있는 상황에서 바이오연료 의무보급제도 시행은 전체 국민에게 영향을 미치는 중요사항이나 만큼 반드시 사전검토가 필요한 사항 등에 대해 논하고자 한다.

• Journal of the korean Society of Automotive Engineers
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• v.13 no.3
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• pp.76-81
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• 1991

1. 서론. 2. 가솔린 자동차. 3. 디젤 자동차. 4. 메탄올 엔진. 5. 결어 자동차 보유대수가 급격히 증가하고 대도시에서의 평균속도가 매년 떨어지며 가솔린의 유황 및 납 함량이 매우 높은 우리의 실정에서는 기존의 삼원촉배에서 귀금속사용량을 줄이고 급격한 가속이나 비정상적인 운전에 의하여 삼원촉매의 용융 및 파괴가 일어나지 않도록 내열성, 내충격성 및 소결성이 우수한 삼원촉매를 개발하며 연료속에 포함된 높은 농도의 피독물질에 의하여 삼원촉매의 성능이 떨어지지 않도록 하는 삼원촉매에 대한 연구가 필요하다. 또한 삼원촉매를 테스트하는 우리의 실정에 맞는 driving cycle의 확립과 이를 시뮬레이션 할 수 있는 모델의 개발도 시도되어야 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.321-324
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• 2013

디젤엔진에서 노킹 현상은 엔진의 성능 및 수명에 직접적인 영향을 주는 중요한 인자이며, 엔진 밸런스 또한 엔진 출력 및 내구성에 직접적인 영향을 미치는 중요한 인자이다. 따라서 노킹 진단 및 엔진 밸런스 보정 알고리즘을 적용하여 ECU를 최적화 하고자 한다. 또한 OBD-II 표준을 사용하여 차량 위주의 진단기를 개발하여 운전자 중심의 진단 서비스를 제공하며, 자동차 고장진단 신호 및 센서 출력 신호를 실시간 통신이 제공 될 수 있게 한다. 이를 위해 자동차 고장진단 신호 및 센서출력 신호를 유선시스템과 무선 시스템인 블루투스 모듈을 이용하여 실시간 통신이 제공 될 수 있는 OBD-II 진단기 S/W를 설계 및 구현하였다.

• Transactions of the Korean Society of Automotive Engineers
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• v.16 no.5
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• pp.44-48
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• 2008

This paper describes on studies of the heavy duty engine calibration for better fuel economy based on real driving conditions. Using testbed validated software simulation of the engine and turbocharger system, an alternative turbocharger specification, with potential to improve fuel economy was identified. Secondly, the engine calibration was modified to optimize vehicle fuel economy over a typical customer drive cycle whilst still meeting the steady-state (testbed) emissions legislation. These results were confirmed by field testing of a vehicle equipped with the updated specifications. This study found good agreements between the prediction and the field test on the vehicle fuel economy improvements of the express bus with updated calibration and turbocharger.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.6
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• pp.96-102
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• 2004

The diesel particulate filter(DPF) is effective for particulate removal from diesel engine under a variety of conditions, and then the regeneration strategies is very important in the aspects of engine fuel consumption and engine durability. This paper addresses the changes of Peugeot 406 vehicle engine parameters(fuel injection timing, period, rail pressure, emissions exhaust temperature so on) during DPF regeneration. additionally, checked the soot loading mass with mileage and the change of fuel consumption and performance with ash accumulation.

• Journal of the Korean Institute of Gas
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• v.24 no.6
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• pp.77-82
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• 2020

In this paper, we developed a cooling system for the refrigeration truck using natural carbon dioxide refrigerant which is attracting attention as an environmentally-friendly refrigerant. We developed a high efficient environmentally-friendly refrigerated truck that converted the existing diesel vehicle into an LNG vehicle to improve emissions of truck and improved the efficiency of the cooling system by utilizing a heat of LNG vaporization. The COP of refrigerated truck system was increased 144%.

• Journal of the Korea Convergence Society
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• v.11 no.1
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• pp.181-186
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• 2020

Civil technologies and parts occupy big ratio in military vehicle as military supply goods were commercialized. In case of the military vehicle engine, the civil purposed engine has been militarized without developing engine for defense industry. Because of this, it happens that Euro-5 version is mounted in spite of Euro-6 at present because the civil laws on the civil purpose engine and required operational capability for militarization are applied by overlapping. Therefore, this study focused on current situation and issues on the military vehicle emission regulation and suggested how to improve through analyzing the theses, articles, Korean laws and systems. For improving methods, imposing the emission certification duty and exempting the certification for the vehicle of high strategical importance were suggested through aligning the related laws. Consequently, it is expected that this study will be used for basics of checking the civil laws and connection with military systems for commercialization of military supplied goods.

• Journal of the Korean Applied Science and Technology
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• v.32 no.2
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• pp.348-361
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• 2015

To reduce the effects of greenhouse gas (GHG) emissions, the government has announced the special platform of technologies as parts of an effort to minimize global climate change, and the government distributed biodiesel since 2006 as the further efforts. Although there are some debates about some quality specifications and unbalanced of source (44% from palm oil), more than 400kton/year of biodiesel was produced in 2013. Moreover the amounts will be increased when the RFS is activated. To solve the unbalanced situation and to achieve the diversity of feeds, it is essential that many researches should be considered. Especially, free and bond glycerines are one of the important properties seriously affected to the combustion system in vehicle & cold properties. Previous method (KS M 2412) couldn't cover the biodiesel derived from lauric oil($C_{12:0}$) such as PKO (Palm Kernel Oil), Coconut oil because those compositions are lighter than other conventional biodiesel sources. In this study, we review the existed method and figure out the factors should improve to analysis the glycerine from PKO and Coconut oil biodiesel. Modifying the analysis conditions to enhance the resolution and change the internal standards to avoid the overlapped- peaks between Capric acid ME ($C_{10:0}$) and standard#1(1,2,4-butantriol). From this revised method, we could solve the restrictions of previous methods. And check the possibility of new method to analyze the glycerine in biodiesel regardless of sources.