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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/>
디젤 기관으로부터 배출되는 입자상물질의 제거 장치 개발에 관한 기초 연구 - 버너 방식
박동선(D.S.Park),김재업(J.U.Kim),이만복(M.B.Lee),김응서(E.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
In order to eliminate the TPM(total particulate matter) from diesel engine, we designed and manufactured the paniculate trap system using the burner. We also investigated burner characteristics according to the operating parameters.<br/> Burned gas temperature can be well controlled by the 2nd air flow rate than the 1st one. To lower axial and radial temperature gradient in the filter, the higher space velocity is needed.<br/>
버너방식 DPF 시스템에서 가스온도 제어를 통한 입자상물질 연소율제어의 실험적 검증
박동선(D.S.Park),김재업(J.U.Kim),현범용(B.Y.Hyeon),조훈(H.Cho),김응서(E.S.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
Work on the reduction of particulate matter(PM) from a diesel vehicle has led to a new trap system and a control method to control the combustion rate of the PM filtrated in the<br/> trap, which was named as 'Active exhaust feeding regeneration(AEFR) system' by its operation mechanism. Ceramic cordierite filter is a major component of the trap and susceptible to thermal shock. Thus system was designed to reduce the peak temperature and temperature gradients in the trap: these have been considered to be the main factors causing thermal shock of the filter during regeneration. It uses the engine's exhaust gas p3.rtially for regeneration of the ceramic filter. It controlled bypass flow rate of the engine's exhaust gas precisely to control the temperature of the gas entrained into the filter. Gas temperatures were measured inside filter. also the oxygen concentration at the outlet of the filter was monitored during regeneration to study combustion of the PM. The temperature distributions and temperature gradients in the filter during regeneration varied widely. according to the regeneration control schemes. Finally, this system shows relatively low peak temperature and temperature gradients in the filter during its regeneration. It is considered that this system uses a new method to control the combustion rate of the PM, which is different from the methods used by others.<br/>
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/>