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베인형 바이너리 브레이크 진공 펌프에 관한 해석적 연구
이준용(Junyong Lee),이헌균(Heonkyun Lee),허형석(Hyungseok Heo),황병성(Byeongseong Hwang),이재문(Jaemoon Lee),김홍기(Hongki Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Vane type binary vacuum pump is the equipment that make vacuum in the brake booster using the negative pressure caused by the rotation of the rotor for decelerating or stopping the vehicle. Mechanical vacuum pump in diesel engine, the negative pressure of engine intake manifold in the gasoline engine is used as the primary vacuum source. Recently, according to the introducing engine downsizing and turbo charger technology for improving fuel efficiency, electric vacuum pump is used as additional vacuum source. In this study, the effect on flow rate and outlet pressure with respect to the design parameter such as clearance, vane angle and outlet position has been examined using CFD analysis.
자동변속기용 단독 구동 동축 2단 전동식 오일펌프 특성 분석
이준용(Junyong Lee),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이병석(Byeongseok Lee),이호식(Hosic Yi),심정민(Jeongmin Shim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Automatic oil pump pressurizes oil for transmission components to operate under high pressure and circulates oil to the lubricating part under low pressure. The oil pump elevates oil pressure to high level to be possible to transfer torque. Pressure control valves in the valve body reduces the pressure of some of the pressurized oil to low level. That is, over-design of the oil pump is a major cause of power loss and it is possible to reduce power loss by separating oil pump into the high pressure pump and low pressure pump. This paper introduces the 2-stage oil pump which has two oil pump in one housing and is driven by the same shaft, the low pressure pump supplies lubricating oil and the high pressure pump generates transmission oil pressure. In this paper the performance of th 2-stage oil pump for automatic transmission system is analyzed by computational fluid dynamic method.
단흡입 양토출 2단 오일펌프의 유량 분배 특성에 관한 해석적 연구
이준용(Junyong Lee),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이병석(Byeongseok Lee),심정민(Jeongmin Sim),전문수(Munsoo Chon) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently, To improve fuel efficiency and power consumption reduction technology in automobile parts is the issue. Automatic transmission oil pump for electric vehicles(EV) generates high pressure(HP) for shifting and low pressure(LP) for lubrication. There is the problem that unnecessary power loss by reducing automatic transmission fluid(ATF) pressure HP to LP. Power loss of the oil pump is a cause of deteriorating the fuel consumption of automobiles. In the case of EV, it is necessary to large capacity of the electric motor. and it grows the power consumption of the pump. Double discharge single suction 2-stage oil pump configures the HP pump and LP pump part to the single axis. It is possible to pressing the pressure required and reduce unnecessary power loss. In this study, HP, LP line pressure rotational speed of the rotor, ATF oil temperature of 2-stage oil pump has confirmed the effects on flow rate by using the CFD analysis. The pump characteristic according to the change in the rotational speed of the rotor was compared by experimental researching.
실린더 압력 기반 실시간 가상 NOx센서 개발 - Part 2
이준용(Junyong Lee),박원아(Wonah Park),이정우(Jeongwoo Lee),이승하(Seungha Lee),이승현(Seunghyun Lee),민경덕(Kyoungdoyg Min),유준(Jun Yu),조성환(Sunghwan Cho) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
디젤 엔진에 대한 배기 규제가 강화됨에 따라 새로운 연소 기법을 이용하여 엔진 자체의 배출물을 줄이거나 후처리 장치 등을 이용하여 최종 배출물을 줄이는 등의 노력이 이루어지고 있다. 특히, 질소 산화물(NOx) 감소를 위한 실린더 내 연소제어와 후처리 장치의 효율을 최적화하기 위해서는 실시간으로 배출되는 NOx 에 대한 정보가 필요하다. 따라서 본 연구(Part 1)에서는 실린더 압력과 ECU에서 활용 가능한 정보들을 이용하여 실시간으로 발생하는 NO 를 예측할 수 있는 모델을 개발하였다. 모델은 확장 Zeldovich 메커니즘에 기반한 0-D 모델로 엔진 운전 상태에서 ECU 자체에서 계산될 수 있도록 단순화 되었다. 개발된 모델은 CFD 모델 결과를 이용하여 동일하게 주어진 조건 하에서 모델 자체의 신뢰성을 검증되었다. Part 2 에서는 실험적 검증을 위해 2.2L 디젤 엔진을 이용하여 다양한 운전조건(RPM, 부하, EGR, 주분사시기 등)에서 배기가스 분석기 결과와 모델을 비교 검증하였다. 정상상태와 과도상태 실험 결과 넓은 운전영역에서 모델이 실험 값을 잘 예측함을 확인할 수 있었다.
디젤엔진의 DPF 재생 시 입자상 물질의 크기 분포 및 개수 특성
김동수(Dongsu Kim),이정우(Jeongwoo Lee),이준용(Junyong Lee),이승하(Seungha Lee),이승현(Seunghyun Lee),이정연(Jungyeon Lee),이윤우(Yoonwoo Lee),최회명(Hoimyung Choi),민경덕(Kyungdoug Min) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
EGR is a promising technique to meet the demand of stringent emission regulations. For example, the new upcoming emissions regulation, EURO 6, requires reduction of NOx emissions by 55% while maintaining the same level of PM emissions. However, reducing NOx emissions by applying a higher EGR rate inevitably yields higher PM emissions due to NOx-PM trade-off relationship. Hence, increased PM emissions caused by the use of higher EGR rate lead to more frequent DPF regeneration. Therefore, it is necessary to have a look at emission characteristics during the regeneration event. However, most of recent studies focus on downstream emissions of after-treatment system. Thus, in this research, not only the distribution of downstream PM particle size is studied but also the distribution of upstream PM particle size is investigated so that future strategies and data for DPF regeneration can be established. In general, DPF regeneration is favored at high speed and load conditions.
Lee, Seongsoo,Park, Junyong,Cho, Kyungjun,Lee, Hyunsuk,Seo, Chulhun,Ahn, Seungyoung,Kim, Joungho,Kim, Dong-Hyun,Cho, Yeonje,Kim, Hongseok,Song, Chiuk,Jeong, Seungtaek,Song, Jinwook,Park, Gyeyoung,Hong Institute of Electrical and Electronics Engineers 2019 IEEE transactions on industrial electronics Vol.66 No.6
<P>In this paper, we first proposed a novel hybrid loop array (HLA) for low leakage electromagnetic field (EMF) level and high efficiency in a wireless high power transfer system. The proposed HLA effectively enhances the system efficiency and shields leakage EMF in a wireless power transfer (WPT) system using kHz range resonant frequency. The key originality of the proposed HLA is the combination of two types of loop coil; shielding loop coil (SLC) and amplifying loop coil (ALC). SLCs reduce leakage EMF, and ALCs significantly enhance the magnetic field from a Tx coil. The simulation and experiment results show that the proposed solution successfully overcomes the limitations of the existing solutions. Analytical modeling and design procedure are introduced and discussed. In addition, the experimental verification of the simulation result is included. We first designed and modeled an HLA considering the coupling effect of neighboring loop coils to evaluate its efficiency and leakage EMF. With the proposed HLA, we demonstrated a 9.36% improvement in the efficiency and 3 dBm reduction in the leakage EMF near the WPT system.</P>
Junyong Jang,Su-gil Cho,Su-Jin Lee,Kyu-Seob Kim,Ji-Min Kim,Jung-Pyo Hong,Tae Hee Lee IEEE 2015 IEEE transactions on magnetics Vol.51 No.3
<P>Reliability-based robust design optimization (RBRDO) is a notable method to secure the quality and feasibility of performances from uncertainties. In this paper, geometric uncertainties of a stator sheet that can occur during a stamping process are considered as the uncertainty of controllable variables. Then, as the uncertainty of uncontrollable variables, skew angle due to inexact lamination is considered. No researches on the effect of this uncertainty have been performed. To analyze the effects of the uncertainties, the kernel density estimation (KDE) was employed to estimate the distribution because of its convenience, flexibility, and robustness. Then, RBRDO with the KDE is performed and the optimum results are compared with real data measured from manufactured motors.</P>