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2.2L 디젤 엔진에서 NO<SUB>x</SUB> 흡장률 기반 LNT 재생 조건 결정
천봉수(Bongsu Chun),이정우(Jungwoo Lee),한만배(Manbae Han) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.3
This study was carried out to determine an optimal lean NO<SUB>x</SUB> trap (LNT) regeneration condition based on a NO<SUB>x</SUB> storage fraction. The LNT regeneration was performed by an in-cylinder post fuel injection method. A NO<SUB>x</SUB> storage fraction is defined by the ratio of current cumulated NO<SUB>x</SUB> amount in the LNT to the NO<SUB>x</SUB> storage capacity: 0 means empty and 1 fully loaded. In this study five engine operating conditions were chosen to represent the New European Driving Cycle. With various NO<SUB>x</SUB> storage fractions each engine operating condition, the LNT regeneration was executed and then NO<SUB>x</SUB> conversion efficiency, additional fuel consumption, CO and THC slip, peak catalyst temperature were measured. The results showed that there exist an optimal condition to regenerate the LNT, eg. 1500 rpm 6 bar BMEP with below 0.7 NO<SUB>x</SUB> storage fraction in this experimental constraint.
2.2L 직분사 디젤 엔진에서 LNT 촉매의 재생 시기 결정
천봉수(Bongsu Chun),한만배(Manbae Han) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study is to investigate the timing of the initiation of the LNT regeneration based on the cumulatively stored NOx amount. Three engine operating conditions were explored through the study, 6 bar BMEP at 1500 RPM, 1750 RPM, 2000 RPM. When a relative NOx amount to the maximum reaches 25%, 50%, 75%, 100%, a regeneration of the LNT was executed at each engine operating condition. Then we determine which relative NOx amount would be best with maintaining a NOx conversion efficiency high. Given engine operating conditions and LNT composition, it is found that the initiation of the LNT regeneration should be executed at lower than a relative NOx amount of 50% to keep a NOx conversion efficiency higher than 70%.
김현준(Hyunjun Kim),천봉수(Bongsu Chun),한만배(Manbae Han),한문식(Moonsik Han),김용래(Yongrae Kim),이용규(Yonggyu Lee),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2
In this study we analyzed the on-road driving performance of two parallel-type diesel-hybrid buses which have been driven in Daegu metropolitan area. A real-time on-board data logger was facilitated to measure the vehicle information such as vehicle speed, idle stop, state of charge of battery, and engine operating conditions. These diesel-hybrid buses ran as a commuter at Daegu Exco area and Dalsung industrial complex. The driving pattern in Exco area comprised more frequent idle stop and relatively lower speed than at Dalsung area, where comprised no idle stop. Due to those different driving patterns, the fuel economy at Dalsung showed 3.7 km/ℓ, which is about 8% higher than that of Exco. The main causes of this come from the higher portion of regenerative braking and higher speed which moves to the operating points of diesel engine with a lower fuel consumption.
금속분말사출성형공법을 이용한 가솔린 터보차저의 웨이스트 게이트 밸브 어셈블리 열 충격 내구 시험
남충우(Chungwoo Nam),한만배(Manbae Han),천봉수(Bongsu Chun),신재식(jaesik Shin),김종하(Jongha Kim),민두식(Doosik Min) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.4
A waste gate valve (WGV) assembly for a gasoline turbocharger is typically manufactured by means of precision casting. In this study, however, it was newly manufactured in a more innovative way, metal injection molding (MIM) using Inconel 713C alloy, and its performance was tested in a 1.6L direct injection gasoline engine by a thermal shock durability test that lasted 300 hours, after which the results were compared to those of a precision-cast WGV assembly with regard to the engine intake boost pressure, turbine wheel speed, and transient intake pressure. It was found that the two WGV assemblies showed similar performance levels throughout the durability test.