• 한국공작기계학회논문집
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• 제10권1호
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• pp.10-15
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• 2001

Urgent increasing of the vehicles influence air pollution and the damage of the plants and animals. Particularly, exhaust-ing particulate of diesel vehicles give serious effect to human life. Therefore, this study aim to reduce amount of particulate and to contribute developing after-treatment in diesel engine. Through the experimental and theoretical study about charac-teristics of the electric heat regeneration, various results are obtained.

• 한국자동차공학회논문집
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• 제2권5호
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• pp.58-65
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• 1994

In order to reduce particulate emissions from diesel vehicles, mathematical model is established and analyzed on ceramic wall-flow monolith filter. A wall-flow monolith filter placed in the exhaust stream of a diesel engine can effectively limit the emission of diesel particulates through the monolith. The accumulated particulates can then be periodically combusted inside the monolith by directing hot gas to the monolith while normal engine exhaust is routed around the monolith system. The resulting low flow rates through the monolith require consideration of gas dynamics through the channels as well as particulate combustion to analyze this regeneration process. A mathematical model of the regeneration is formulated as a system of nonlinear partial differential equations describing the conservation of mass, momentum and energy. Numerical solutions are obtained by using a finite difference techniques for the spatial discretization. So we can use filter simulation program for the purpose of filter design and actual filter regeneration

• E2M - 전기 전자와 첨단 소재
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• 제8권2호
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• pp.144-150
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• 1995

Ceramic filter using energy trapping effect is used bandpass filter at high frequency. In this paper, the resonant points of the symmetrical modes and antisymmetrical modes were theoretically analyed and synthesized these modes in order to know the filter characteristics. We simulated them using the computer and also fabricated the ceramic filter using PZT-4 piezoelectric plate made by Valpey Fisher Co., The 1.5[.mu.m] - thick platinum electrode were deposited on the ceramic plates with the various masks. The characteristics of the fabricated filters were measured using the spectrum analyzer. Experimental data were compared with the theoretical results. The maximum-pass frequencies coinsided exactly. The bandwidths of the fabricated filters were slightly different between theoretical and experimental results. We found that these phenomenon were caused by the stray capacitance between the two neighbor electrodes..

• 한국생산제조학회지
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• 제8권2호
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• pp.50-55
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• 1999

The exhaust emissions from diesel vehicle are known to be harmful to human health and environment. Recently, one of the most environment problems is particulate matter. In this study, through the actual exper iment and heat transfer of exhaust pipe in light duty diesel engine equipped with the ceramic filter trap of throttling type, following results are obtained. 1. In case of light duty diesel engine equipped with ceramic filter trap of throttling type, Power and torque of engine were decreased about 5%, compared with the case without trap system. It means that was not so much effect on base engine performance.2. If the length of exhaust pipe when equipping with ceramic filter trap is suitably controlled, the range of regeneration will be expand much more.3. Particulate matter reduction efficiency of ceramic filter trap system was about 70%-80%, so it was proved a good system to reduce particulate matter.In experiment, test was conducted to estimate engine emission in 2,476cc light duty diesel engine which was equipped with ceramic filter trap.

• 대한전기학회논문지
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• 제40권1호
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• pp.73-81
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• 1991

In order to simulate the ceramic filter in the state of the one-strip electrode, the theory has been analyzed and a computer program has been developed using the energy trapping effect. The ceramic filters were fabricated using the PZT-4 specimen. The necessary condition that the ceramic filter has the energy trapping effect is that the electroded portion frequency should be smaller than the unelectroded portion frequency when the wave number is zero. Each of the average differences of the resonant point and bandwidth between by the theoretical calculations and by experiment results was 5.6[%] and 3.72[%]. It is considered that the one-strip ceramic filter having a desired characteristics and the lowest difference can be fabricated easily by means of the simulation developed in this paper and the fabrication methods.

• 한국자동차공학회논문집
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• 제4권4호
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• pp.164-170
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• 1996

Among after treatment devices which reduce exhaust gas of diesel engine, diesel oxidation catalyst(DOC) with high reduction efficiency for gaseous matter and particulate matter is now being studied actively. In this study, an experiment was conducted to analyze the effects on factors of oxidaton characteristics and conversion efficiency of DOC. We tested to estimate change of engine performance whether a 11,000cc diesel engine equipps with DOC or not. We conducted test to estimate the reduction efficiency of exhaust gas in P-5 mode, in D-13 mode of heavy duty diesel regulation mode and in somoke opacity mode for two samples and also we conducted test to analyze the effects about both exhaust gas velocities 1,100rpm and 2,200rpm

• 오토저널
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• 제10권5호
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• pp.54-60
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• 1988

This study is a theoretical analysis and experimental effect of oxygen concentration, exhaust velocity and trap inlet temperature on particulate ignition temperature with installation of ceramic filter trap in diesel engine. So the following results are obtained. 1, Based on the fundamental experiments of the regeneration process, the analytical model was developed and the results from the analytical model agreed with the experiments, then the validity of the model was proved. 2, The ignition temperature for accumulated particulate was proportional to the exhaust velocity and it was known that the optimum exhaust velocity was about 15m/sec. 3, The ignition temperature for accumulated particulate was inversely proportional to the oxygen concentration and the trap inlet temperature, and a minimum oxygen concentration of 5% was required to sustain regeneration. 4, This experimental filter trap(EX-66) is found about 30% of smoke reduction efficiency in comparison with existing muffler.