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대형 상용 엔진에서 SCR의 클리닝 주기 선정 및 저감효율에 따른 내구신뢰성 특성 연구
신재식(Jaesik Shin),강정호(Jungho Kang),김형준(Hyongjun Kim) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.1
Purpose: Performance recovered from SCR through cleaning was studied, measuring differential pressure, NOx reduction efficiency, fuel consumption and engine power before and after cleaning. Ideal cleaning intervals are proposed based on SCR mileage and differential pressure. SCR endurance and reliability improvements through cleaning were studied through physicochemical testing of SCR durability at 43,000km 50,000km, and 110,000km respectively. Methods: Engine power, fuel consumption and exhaust gas were measured using engine full load tests and ND-13 MODE by installing the SCR before cleaned at total engine mileages of 400,000 km, 300,000km and 200,000km. The same tests were performed after cleaning the SCR catalytic converter. Endurance and reliability of the SCR cleaning was studied through the same test by SCR catalyst after each 43,000km 50,000km, 110,000km, durability test on SCR cleaning. Conclusion: We confirmed the low-performance of the SCR due to clogging is restored by SCR cleaning technology. The NOx reduction efficiency was restored to 82%, 86% and 88% from 69%, 72% and 79%. As well as the NOx reduction efficiency, it was confirmed that the engine power, fuel consumption and back pressure was restored to fresh SCR levels. As a result of the durability and reliability achieved through SCR cleaning, we confined the appearance and reduction efficiency through visual inspection and ND-13 MODE are similar to new SCR catalysts. Finally, it was judged that there was no change in performance even when driving the SCR without cleaning throughout the 100,000 km mileage warranty.
Off-road 엔진에서 WGT와 VGT장착에 따른 효율 및 특성 비교
신재식(Jaesik Shin),강정호(Jungho kang),하형수(Hyeongsoo Ha),정학섭(Haksup Jung),표수강(Sukang Pyo) 한국연소학회 2016 한국연소학회지 Vol.21 No.4
The aim of this study is to compare the effectiveness of turbo chargers on engines for off-road use when combined with WGT and VGT technologies. The effectiveness of turbo chargers was measured and performance was compared using a functional model. Exhaust characteristics were compared using WGT and VGT technologies through a gas analyzer. Results showed VGT technology was more effective at high RPM compared to WGT technology. When it came to maximising turbo performance, VGT was more effective than WGT in every test. WGT and VGT produced similar exhaust NOx levels, whereas the VGT was more effective on the PM.
Off-road 엔진의 EGR율에 따른 촉매코팅 DPF의 자연재생율 예측
신재식(Jaesik Shin),강정호(Jungho Kang),하형수(Hyrengsoo Ha),정학섭(Haksup Jung),표수강(Sukang Pyo) 한국연소학회 2016 한국연소학회지 Vol.21 No.3
This paper aims to predict oxidation amounts of catalyst and heat produced through passive regeneration on DPF according to different EGR rates and loads of off-road engines. Soot oxidation model and parameter assumption model were used for the test. Engine data were measureed with 25%, 50% and 75% of 1600 RPM loads and with 0% and 30% of EGR rates in order to estimate parameters. Oxygen levels calculated on the DPF downstream and oxygen levels measured were compared through all of the experimental conditions for validating the model. Oxidation rates on DPF according to different EGR rates and oxygen levels on the DPF downstream were estimateed successfully, which can be applied for off-road vehicles.
Lambda 센서를 이용한 DPF 재생시 압력강하 예측 모델링
신재식(Jaesik Shin),한만배(Manbae Han) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
This study aims to predict a pressure drop through a diesel particulate filter(DPF) and a width of soot layer deposited on the DPF during the regeneration by estimating the oxygen concentration using a lambda sensor. The model in this study consists of several submodels such as an oxygen estimation model, a soot width model, a soot oxidation model, and a pressure drop model. To estimate the model parameters, the DPF was loaded at 2000RPM BMEP 5.5 bar and regenerated at 15000RPM BMEP 8bar. Then the model was validated at two regeneration conditions: 1750RPM BMEP 6bar and 2000RPM 8bar. The soot width and the pressure drop through the DPF during the regeneration was successfully estimated by using the lambda sensor which can be applied for the vehicle application.
운행 경유자동차의 과급기 장착유무에 따른 매연 검사기준 개선방안 연구
신재식(Jaesik Shin),양진호(jinho Yang),여운석(Unseok Yeo),김현준(Hyunjun Kim),오세인(Sein Oh),이효열(Hyoyeol Lee),최수광(Sookwang choi) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Currently, emission inspections of operating vehicles are regularly conducted to improve the air environment. In particular, diesel vehicles are inspected by measuring smoke in free acceleration smoke test procedure through a smoke meter. In addition, if a turbocharger is equipped, the emission standard is relaxed in free acceleration smoke test procedure inspection. However, most currently vehicles are equipped with turbocharger so the standard is not effective. In addition, it is difficult to identify failure of the diesel particulate filter during the inspection. In this study, analyzed the feasibility of abolishing the emission standard according to the turbocharger equipped status based on the inspection data of domestic diesel vehicles. As a result, the smoke emission average increased by 3% according to the equipped of the turbocharger. However, emission standard application errors were found at the level of 20%. In addition, it is not effective because all vehicles manufactured after 2004 are equipped with turbocharger. and it is difficult to check the failure of diesel particulate filter during the inspection. Therefore, it is considered reasonable to abolish the relaxation of the emission standard of diesel vehicles in free acceleration smoke test procedure.