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김재업(J.U.Kim),박동선(D.S.Park),이만복(M.B.Lee),김응서(E.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The regeneration characteristics of the burner type particulater trap system were investigated. The key point that guarantees the durability of the filter is to lower the peak temperature, the axial and radial themperature gradients in the filter during regeneration. In this study we introduced the feedback control of the bypass valve to keep the burned gas temperature to be constant in front of the filter.<br/> Regeneration of the particulates starts near center of front side and ends around the circumference of rear one. As the closing clearance angle decreases, the peak temperature and the maximum temperature gradients are reduced and the regenertion time increases. When the burned gas temperature is kept to 700℃ and the closing<br/> clearance angle is set to 5°, the maximum temperature doesn't exceed 8OO℃ and the thermal gradients are limited to ±35℃/cm.<br/>
디젤 입자상물질 후처리 장치에서 입자상물질의 연소에 미치는 재생 인자의 영향
김재업(J.U.Kim),조훈(H.Cho),김형욱(H.U.Kim),박동선(D.S.Park),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The effects of the regeneration parameters such as inlet gas temperature, space velocity, oxygen concentration of the exhaust gas, and initial particulate loading on the oxidation of the particulate inside ceramic cordierite filter have been investigated through an engine experiment. As the inlet gas temperature increases, the remarkable filter temperature occurs owing to the rapid combustion rate. Though the higher space velocity affirms the safe regeneration, it also requires much fuel consumption of the burner. For that reason, the space velocity should be compromised considering the fuel economy. The excessive accumulation of the particulate may cause undesirable regeneration temperatures inside filter even under the optimized regeneration condition.<br/> The inlet gas temperature should be selected to overcome the variation of the oxygen concentration which is inherent feature of the diesel engine. It is the most important factor in the regeneration control techniques.<br/>
이형승(H.S.Yi),김재업(J.U.Kim),김한조(H.J.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To overcome such problems as lower power and abnormal combustion at the intake port injection type hydrogen supply system. we designed and constructed solenoid driven in-cylinder injection type hydrogen injector. Injection quantity and leakage amount were measured through the rig test. To predict the effects of design factors. the performance of injector was numerically analyzed.<br/>
버너방식 DPF 시스템의 재생과정 중 발생하는 내부 온도분포 및 온도구배에 관한 고찰(Ⅱ)
박동선(D.S.Park),김재업(J.U.Kim),조훈(H.Cho),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
A method to control the combustion rate of the filtrated particulate matter (PM) in the ceramic filter of the diesel particulate filter (DPF) system was studied in this work. Ceramic cordierite filter is a major component of the DPF system and susceptible to thermal shock. In this point of view, a stable regeneartion of the filter is the most important thing in commercialization of the DPF system. There are four factors that govern the regeneration process like as a initial particulate loading weight, a space velocity, an oxygen concentration and a temperature of the gas that entrained into the filter during regeneration. The first and second have been considered as main factors from early studies. The third was realized in the vehicle for the first time by Pattas. However the last was not yet considered as a controllable factor which would be realized in the vehicle.<br/> In this work, a method to control the gas temperature entrained into the filter during regeneration was designed and the results by the method in steady state engine conditions were analyzed. Finally it was considered that this method was very effective to control the combustion rate of the PM during regeneration in almost engine conditions.<br/>