• Journal of Power System Engineering
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• v.18 no.3
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• pp.14-19
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• 2014

The purpose of the study is to investigate the effect of additive catalyst according to the thermal aging of vanadia SCR catalysts. At a fresh condition, the $3V_2O_5-5WO_5-92TiO_2$ SCR showed the highest NOx conversion rate of about 30%, the performance of 5 kinds of SCR to which additive catalysts were added was not improved due to the insignificant effect of acid site control. For catalysts aged for 12h at $700^{\circ}C$, the SCR to which 3wt% Zeolite was added decreased in NOx conversion rate by 2.5% on average compared to the fresh SCR, it showed higher thermal durability than other additive catalyst. For 3Zeolite with high performance of NOx conversion rate during thermal aging, the Zeolite with stronger durability at a high temperature than other 5 kinds of SCR catalysts decreased the sintering of catalysts.

• Journal of Energy Engineering
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• v.24 no.2
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• pp.79-83
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• 2015

Hydrogen has long been recognized as a fuel having some unique and highly desirable properties, for application as a fuel in engines. Hydrogen has some remarkably high values of the key properties for transport processes, such as kinematic viscosity, thermal conductivity and diffusion coefficient, in comparison to those of the other fuels. Such differences together with its extremely low density and low luminosity help to give hydrogen its unique diffusive and heat transfer characteristics. The thermodynamic and heat transfer characteristics of hydrogen tend to produce high compression temperatures that contribute to improvements in engine efficiency and lean mixture operation.

• Transactions of Materials Processing
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• v.15 no.3 s.84
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• pp.226-231
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• 2006

The fuel injector is a pa.1 that controls the fuel supply of automotive engine. The housing of the fuel injector supports the rod, the needle valve and the solenoid. In this study, the rigid-plastic FE-analysis by using the design of experiments (DOE) and the response surface methodology (RSM) has been performed to produce the product reducing the under-fill and the maximum effective strain. From the results of DOE, the stem of counter punch and the face angle of punch at the $1^{st}$ process, and the stem of punch at the $2^{nd}$ process were determined as the significant design variables far each response such as the upper under-fill, lower under-fill and the maximum effective strain. From the results of RSM, the optimal values of the design variables have been also determined by simultaneously considering the responses.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.143-146
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• 2009

소형엔진은 매우 열악한 환경에서 작동하게 되는데, 이러한 엔진으로 흡입되는 공기를 정화하는 흡기시스템은 매우 중요한 설계인자이다. 본 연구는 이러한 소형엔진에 적용하기 위한 흡기시스템을 개발하고, 효율적인 개발 업무를 진행할 수 있도록 하는데 그 목적을 두었다. 기초 자료를 확보하기 위하여 3가지의 기본 모델을 제작하였다. 이를 바탕으로 유동 해석 및 엔진 특성 분석을 통해 기존 사양 대비, 우수한 성능을 보이는 모델을 제시하였다.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1133-1136
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• 2010

2600cc급 디젤엔진의 냉각수 유동특성 개선을 위한 수치해석적 방법을 제시하기 위하여 본 연구가 수행되었다. 실린더 블록 및 헤드의 유동특성 분석을 위하여 개스킷 냉각수 통로의 면적과 갯수가 중점적으로 고려되었다. 베이스 모델의 수치해석적 분석에서 입구측에 치우친 냉각수 홀의 배치에 의하여 1, 2번 실린더 헤드로만 주 유동이 발생되었다. 이러한 문제점을 개선하기 위하여 개스킷 냉각수 통로를 재설계하였다. 수정모델은 주 유동이 4번 실린더 측으로 유도되었으며, 배기밸브 사이의 유동도 개선되었다. 재설계과정에서 개스킷 냉각수통로의 전체면적을 고려치 않게 되면 유량이 줄어들게 되는 문제점이 발견되었다. 본 연구를 통하여 실린더 헤드와 블록사이의 냉각수 유동을 제어하는 개스킷의 중요성을 확인하였으며, 냉각수 유동특성 최적화는 개스킷 홀의 총 면적을 고려하여 냉각수의 총질량유량을 설계하여야 한다.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1000-1003
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• 2010

기존 Non-Road 가솔린 불꽃점화 소형엔진의 경우 대부분이 캬브레이터 연료 공급 방식으로 연비 및 배기가스 성분이 매우 열악한 실정이다. 본 연구에서는 이러한 단점을 극복하고 배기규제에 대응하기위하여 전자제어식 연료분사방식으로 엔진을 변경하고, 관련핵심 부품의 설계 및 개발을 수행하였다. 전자제어식 소형엔진에 적합한 인젝터, 연료펌프를 선정하였으며 연료레일은 새로이 설계하여 장착하였다. 최적의 인젝터, 연료펌프 및 흡기포트를 선정하기위해 각각의 핵심 부품에 대한 성능개발을 수행하였다. 제작된 소형엔진은 엔진성능 개발을 통하여 연비 및 배기가스를 개발할 예정이다.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1007-1009
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• 2010

실험을 통하여 엔진의 성능을 파악하고자 한다면 적지 않은 시간동안 많은 비용과 노력이 필요하다. 최근 연구에서는 이러한 단점을 해결하기 위해 CFD를 이용 선행해석을 통해 미리 그 엔진의 성능을 예측하여 실험에 들이는 시간과 비용을 줄여가고 있다. 본 연구는 실험을 통하여 소형엔진의 성능을 알아보기 이전에 선행해석을 통해 소형엔진의 성능을 예측하고자 한다. 소형엔진의 선행 해석을 위해 전자제어 연료분사 방식의 400cc급 소형엔진을 모델링하고 1D 해석프로그램인 GT-Power를 통하여 엔진의 Toque, Power 및 배기가스를 예측하였다.

• Transactions of Materials Processing
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• v.9 no.6
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• pp.644-652
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• 2000

Tube hydroforming is recently drawing attention of automotive industries due to its several advantages over conventional methods. It can produce wide range of products such as subframes, engine cradles, and exhaust manifolds with cheaper production cost by reducing overall number of processes. h successful tube hydroforming depends on the reasonable combination of the internal pressure and axial load at the tube ends. This paper deals with the optimal process design of hydroforming process using the genetic algorithm and neural network. An optimization technique is used in order to minimize the tube thickness variation by determining the optimal loading path in the tube expansion forming and the tube T-shape forming process.

• Journal of ILASS-Korea
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• v.22 no.2
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• pp.87-95
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• 2017

Recently, as the interest in environmental issues have increased around the world, the regulation on vehicle exhaust have been tightened in each country. To satisfy such tightened exhaust regulation, automotive manufactures are forced to equipped Diesel Particulate Filter (DPF) at Diesel vehicles. If DPF is used for a long time, DPF regeneration should be performed. The objective of this study is to research on post injection for DPF regeneration. The result of the study was that it was desired that retarding post injection timing, lower load of engine and smaller the amount of main fuel injection, for DPF regeneration. Oil dilution was tended to increase as load was lower, amount of post injection was increased, and post injection timing was retarded.

• 유공압시스템학회:학술대회논문집
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• 2010.06a
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• pp.25-32
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• 2010

A geortor type pump is widely used in lubrication and actuator systems. Especially the pump is an essential machine element of an automotive engine to feed lubrication oil and power source of automatic transmission. A gerotor is a planar mechanism consist of a pair of rotor and circular tooth of stator assembly which forms a closed space. However, related industries do not have necessary technology to design and optimize the pump and paid royalties of gerotor profile on an advanced company. Also, gerotor profiles with setting design parameter have not been sufficiently analyzed from a theoretical view. Therefore, it is very difficult for designer to decide the specifications of the gerotor profiles, and calculation and fluctuation of flow rate is not yet confirmed. In this study, theoretical analyses and optimal design of the gerotor profiles have been performed numerical method by mathematical base. An automated design system of the tooth profile has been developed through MATLAB GUI Program considering various design parameters.