• Journal of the korean Society of Automotive Engineers
• /
• v.17 no.3
• /
• pp.1-10
• /
• 1995

디젤자동차로부터 배출되는 입자상 물질은 건강에 나쁘기 때문에 1980년에 미국환경보호청(EPA)에 의해서 디젤승용차 및 디젤 소형트럭의 입자상 물질 규제가 제정되고 이의 대책으로서 엔진 개조와 병행해서 후처리장치, 주로 입자상 물질 트랩 시스템의 개발이 미국, 유럽, 일본에서 시작되었다. 트랩시스템은 아직 개발단계에 있고 여러가지로 개발과 개량이 계속되고 있다. 여기에서는 그들의 개발의 동향을 소개한다. 1. 입자상 물질 트랩 시스템. 2. 입자상 물질 트랩 시스템의 개발 상황.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.4
• /
• pp.641-647
• /
• 2017

In order to meet the stricter emission regulations, the proportion of after-treatments for vehicles and vessels has been increasing gradually. The objective of this study is to investigate the physicochemical properties according to ash cleaning agents of CDPF for Diesel Engines. Penetrating agents with strong penetration into ash and a surfactant component to mix water and oil were prepared properly. The cleaning characteristics of S1 sample were good. Washcoat loss rate of S1 sample was lower by about 2.2% because of less KOH component and lower Na2SiO3 content. Washcoat loss rate of S4 sample with an added KOH and Na2SiO3 components by penetration agents was increased by about 13%. In terms of less than about 13% of CDPF's washcoat loss rate, it was able to reduce the harmful gas components.

• Journal of Advanced Marine Engineering and Technology
• /
• v.41 no.4
• /
• pp.362-367
• /
• 2017

This study was conducted to compare the particulate removal efficiency of the developed diesel particulate filter using various measurement methods in a high-speed marine diesel engine. A four-stroke mechanical marine diesel engine is used for the test, which has a maximum output of 403 kW and is coupled to an AC dynamometer to control engine speed and load. The test was conducted based on four steady-state engine operating conditions of E3 engine test cycle for the measurement of PM and soot removal efficiency using partial dilution method considered as gravimetric method and filter smoke number method as light absorption method, respectively. As a result of the removal efficiency measurement according to the application of diesel particulate filter, particulate matter was reduced from 76% to 91% and the soot was reduced by more than 90% while meeting the permissible engine back pressure. From these results, the applicability of diesel particulate filter adopted in high-speed marine diesel engines could be confirmed. In addition, based on the result that the particulate removal efficiency varies with different measurement methods, the necessity of unification of these methods could be identified.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.3 no.6
• /
• pp.41-54
• /
• 1995

A mathematical model for wall-flow monolith ceramic diesel particulate filter was developed in order to describe the processes which take place in the filter during regeneration. The major output of the model comprises ceramic wall temperature and regeneration time(soot reduction). Various numerical tests were performed to demonstrate how the gas oxygen concentration, flow rate and the initial particulate trap loading affect the regeneration time and peak trap temperature. The model is shown to b in reasonable agreement with the published experimental results. This model can be applied to predict the thermal shock failure due to high temperature during combustion regeneration process.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2000.04a
• /
• pp.361-363
• /
• 2000

디젤 자동차는 가솔린 자동차에 비하여 연료소비효율이 높고, 경제성이 좋으며 고출력을 낼 수 있어 이에 대한 수요가 증가하고 있지만, 디젤엔진에서 배출되는 매연과 가스로 인한 오염도 심각한 수준에 달하였다. 엔진의 전자화, 고압분사기술등 여러 자동차 관련기술의 발달로 배출오염물질의 저감에 큰 발전을 이루어 왔으나, 계속적으로 강화되어지는 배출규제에 맞추기 위해서는 입자상 물질 후처리 장치의 개발이 가장 현실적인 대안으로 제기되고 있다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.05b
• /
• pp.327-328
• /
• 2003

경유자동차는 연료 특성상 매연을 포함한 입자상물질을 다량 배출하고 있으며, 이러한 디젤입자상물질은 인체에 유해한 발암성 및 돌연변이원성 물질들을 함유하고 있기 때문에 호흡 등을 통한 인체 유입시 건강에 매우 유해하다. 그러므로 디젤입자상물질을 저감시키기 위한 여러 가지 기술들 중 발생된 배출가스가 배기관을 통해 대기중으로 배출되기 전에 엔진 연소실과 배기관 사이에 후처리장치와 같은 기술들을 이용하여 이를 저감시키고 있다. 본 연구에서는 후처리장치들 중 세라믹필터에 백금과 같은 산화성이 우수한 촉매를 코팅하여 만든 촉매식 매연여과장치(DPF ; diesel particulate filter, SK제공)를 사용하였을 때 입자저감성능 및 입자크기별 분포특성을 살펴보고자 하였다. 이를 통해 도시대기오염 저감대책을 기초자료 및 환경학적, 보건학적 연구에 적극 활용하고자 한다. (중략)

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.39 no.4
• /
• pp.351-358
• /
• 2015

In the recent times, the use of gasoline direct injection (GDI) engines has been regarded as a means of enhancing conformance to emission regulations and improving fuel efficiency. GDI engines have been widely adopted in the recent years for their better engine performance and fuel economy compared to those of conventional MPI gasoline engines. However, they present some disadvantages related to the mass and quantity of particulate matter generated during their use. This study investigated the nanoparticle characteristics of the particulate matter exhausted from a GDI engine vehicle installed with different types of gasoline particulate filters, after subjecting it to ultra-lean burn driving conditions. Three metal foam and metal fiber filters were used for each experimental condition. The number concentrations of particles were analyzed for understanding their behavior, and the reduction characteristics were obtained for each type of filter.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.14 no.4
• /
• pp.68-76
• /
• 2006

The minimization of maximum DPF wall temperature and the fast Light-off during regeneration are the targets for the high durability of the DPF system and the high efficiency of regeneration. In order to predict transient thermal response of DPF, one-channel numerical modeling has been adopted. The effect of the ratio of length to diameter(L/D), cell density, the amount of soot loading on temporal thermal response and regeneration characteristics has been numerically investigated under two different running conditions: city driving mode and high speed mode. The results indicate that the maximum wall temperature of DPF increase with increasing 'L/D' in 'High speed mode'. For 'City driving mode', the maximum wall temperature decreases with increasing 'L/D' in the range of $'L/D{\geq}0.6'$. The maximum temperature decreases with increasing cell density because heat conduction and heat capacity are increased. It is also found that the effect of amount of soot loading on light-off time is negligible.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.25 no.7
• /
• pp.974-981
• /
• 2019

Fine dust has become a significant social problem. Diesel engines are used as the main propulsion power source in ships. This study introduces a diesel particulate filter (DPF) that is used as an exhaust after-treatment system for diesel engines to reduce particulate matter known as diesel fine dust. Two materials are used for the DPF: Cordierite and silicon carbide (SiC). In this study, to improve the physical properties of the binder used in the SiC DPF, cordialite was used instead of the SiC-based materials used as the conventional binder to evaluate the thermal durability against high-temperature deformation through the change of the coefficient of thermal expansion. In addition, the physical properties of the silica sol, as a main component of the base coating solution for determining the bond between the binder and the segment, were confirmed. Based on this, the change effect of the binder physical properties was confirmed through experiments by either adding a silane coupling agent or SiC to increase the reactivity of the silica sol.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.5
• /
• pp.176-180
• /
• 2013

After-treatment apparatus ceramic DPF (diesel particulate filter) have been applied to reduce harmful particulate matters(PM) among emissions from diesel engines so far, but they are easy to be fragile and weak in thermal shock. This research aims to investigate a metal type filter which is superior in mechanical strength and heat conduction rate and is beneficial economically in manufacturing. Basic performance of metal DPF such asloading test, temperature gradient test, thermal shock test, heat resistant test and back pressure was carried out. And then their experimental data provided key informations in designing and manufacturing such as detailed structures of metal mesh filter. Also diesel engine and vehicle of 2957cc displacement was tested under lug-down 3 mode and CVS-75 mode. PM reduction efficiency was 54.5% using metal DPF without loss of performance and fuel consumption.