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DI 압축착화기관에서 함산소 첨가제와 EGR의 동시 적용에 따른 배출특성
문학훈,이상근 한국기계기술학회 2010 한국기계기술학회지 Vol.12 No.3
In this paper, the effects of oxygen component in oxygenated additives blended fuels on the exhaust emissions have been investigated for direct injection diesel engine. It tested to estimate changes of engine performance and exhaust emission characteristics for the commercial diesel fuel and oxygenated additives blended fuels which have four kinds of fuel and various mixed rates. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission and brake specific fuel consumption rate also have been investigated. The results of this study show that individual hydrocarbons as well as total hydrocarbon of oxygenated blended fuels are reduced remarkably compared with diesel fuel. It was found that simultaneous reduction of smoke and NOx emission was achieved with oxygenated blended fuels and cooled EGR metho
문학훈(Hak Hoon Moon) 한국가스학회 2016 한국가스학회지 Vol.20 No.1
이 연구의 목적은 브레이크 저더가 자동차 브레이크 시스템에서 나타나는 많은 문제중에 하나 이며,연구자들이나 엔지니어가 브레이크 저더를 최소화하기 위하여 원인과 메카니즘에 대해 연구하고 있음에도 불구하고 나타나는 현상이다.운전자들이 느끼는 것은 핸들이나 브레이크 페달 또는 차체 바닥에서 오는 높은 주파수의 진동으로 느낄수 있으며 소음도 같이 동반하게 된다.따라서 고장사례를 통하여 운전자가 디스크 브레이크의 길들이기를 하거나 디스크의 열변형 부분을 제거하여 브레이크 저더를 저감 할수 있도록 조치방법에 대해서 고장사례연구를 하였다. Brake judder is one of the most serous problems in automotive-brake systems.it has not been eradicated despite all the efforts that many researchers and engineers have made the reduce it by studying its causes and mechanisms. Brake discs play a significant role in judder.The driver experiences judder as vibrations in the steering wheel,brake pedal and floor.in the higher freqency range.the structural vibrations are accompanied by a sound. Brake judder primarily affects the comfort but could,when confronting an inexperienced driver for the first time,lead to faulty reactions and reduced driving safety.
다공성 펠렛을 포집재로 사용하는 매연여과장치의 배압 및 재생 특성에 관한 연구
金鎭玄,柳鍾植,文學勳,車京玉 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-
Diesel particulate trap is a core technology for the reduction of PM from diesel vehicles. This study presents the features and the characteristics of DPF system when using pellet type filters. In comparison with wall-flow filter, the pellet filter has the advantages of cracking free during regeneration and shape flexibility. Experiments are conducted in a test bench simulated as diesel engine exhaust condition. Pressure drop and particle loading rate was compared by using two pellet filters having the porosity of 70% and 0%. Also its regeneration was tested.
자동차 드라이브 샤프트와 액슬 시스템의 트라이볼로지적인 특성에 관한 고장사례 고찰
이일권(IL Kwon Lee),문학훈(Hak Hoon Moon),염광욱(Kwang Wook Youm) 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.6
This study examined the tribological characteristics of the drive shaft and axle system in vehicles. The first drive shaft example contained end play for a CV joint that transferred part of the transmission power to the wheel. The joint part of the drive shaft was deformed because of reduced durability due to wear. Thus, vibrations caused the body to shake and become unbalanced when the drive shaft transferred the power. The second example was the cross-section of a shaft that connected the slip-connection of the propeller shaft on the input side to the yoke flange of the output side; the durability was reduced because of corrosion. End play caused by wear between the bearing and cross-section shaft appeared to cause shaking. In the third example, a grease leak reduced lubrication and thus caused damage to the hub bearing and inside the knuckle. The failure was produced by sticking. The fourth example had noise produced by the gear and gear transfer. This was due to the backlash of the pinion and few ring gears for the differential gear. Therefore, drive shaft and axle systems must be thoroughly checked and managed to minimize and reduce failure phenomena.
스월 제어 밸브를 적용한 직접분사식 가솔린 엔진의 희박연소 특성
이민호 ( Min Ho Lee ),문학훈 ( Hak Hoon Moon ),차경옥 ( Kyung Ok Cha ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.2
N/A The performance characteristics of lean burn system in gasoline engine are mainly affected by the air-fuel mixture in cylinder, gas exchange process of manifold system, exhaust emission of engine, and the electronic engine control system. In order to obtain the effect of performance factors on the optimum conditions of lean burn engine, this study deal with the behavior of mixture formation, gas flow characteristics of air, flow and evaporation analysis of spray droplet in cylinder, vaporization and burning characteristics of lean mixture in the engine, and the control performance of electronic engine control system. The optimum flow conditions were investigated with the swirl and tumble flows in the combustion chamber with swirl control valve. The performance characteristics and optimum condition of flow field in intake system were analyzed by the investigation of inlet flow of air and combustion stabilization on cylinder.
자동차 클러치, 수동변속기, 타이어 시스템의 마찰에 관련된 화재사례 연구
이일권(Il Kwon Lee),문학훈(Hak Hoon Moon),김진준(Jin Jun Kim) 한국가스학회 2015 한국가스학회지 Vol.19 No.3
이 논문의 목적은 자동차 클러치, 수동변속기와 타이어 시스템의 마찰에 관련된 화재에 대한 고장사례를 분석하고 연구하는 것이다. 첫 번째 사례는 반복적으로 클러칭하면서 자동차의 클러치 디스크가 플라이 휠의 접촉면과 접촉하면서 열에 의해 과열되어 이 열이 수동변속기의 외부로 흘러 고착된 오일 찌꺼기에 옮겨 붙어 화재가 발생된 것으로 확인되었다. 두 번째, 사례로 변속 장치는 기어와 기어의 접촉에 의해 동력을 전달한다. 변속기 오일이 변속기 케이스의 균열로 인해 오일 부족 현상이 일어나 변속기 케이스 상단의 퇴적물에 의해 화재가 발생된 것을 확인하였다. 세번째 사례는 건조한 구덩이에서 빠져나오려고 반복적으로 가속페달을 작동시키면서 타이어와 도로의 마찰이 반복되면서 내부의 축적된 열에 의해서 화재가 발생된 것으로 확인되었다. 따라서, 운전자는 운전중 마찰부에 화재가 발생하지 않도록 세심하게 관리하여야 한다. The purpose of this paper is to study and analyze the failure examples for fire by friction on clutch, manual transmission and tire system in a car. In the first example, the driver took the pedal with foot to act the clutch. But the clutch disk did not return from flywheel by leakage of clutch hydraulic line. The heat was produced between clutch disk and flywheel by surface contacting. As a result, it was produced the fire by oil sludge sticked with transmission. In the second example, the transmission system was operated to transfer power of engine by contacting with gear and gear. But, as if the oil of transmission was caused the oil insufficiency because of leaking by crack of transmission case, it found the fact that was produced the fire by deposit material on transmission case. In the third example, when the car’s driver continuously pushed an accelerator pedal for escaping from dry pit, the tire took the heat by the friction force between tire and surface of road. As a result, it became the direct cause for the fire. Therefore the driver must manage not to produce the fire with friction parts by heating during running.