흡기 선회유동 및 연소인자가 V8형 TCI 디젤엔진의 성능 및 배출가스특성에 미치는 영향

윤준규(Junkyu Yoon),차경옥(Kyungok Cha) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.4

The Effects of intake swirl and combustion parameters on the performance and emission characteristics in a V8 type turbocharged intercooler D.I. diesel engine of the displacement 16.7ℓ were studied experimentally in this paper. Generally the swirl in the combustion process of diesel engine promotes mixing of the injection fuel and the intake air. Also, TCI diesel engine is put to practically use intercooler in order to increase boost efficiency which is cooled boost air. As a result of steady flow test, when the swirl ratio is increased, the mean flow coefficient is decreased, whereas the Gulf factor is increased. And through engine test, its can be expected to meet performance and emission by optimizing the main parameters; the swirl ratio is 2.25, compression ratio is 17.5, combustion bowl is re-entrant 8.5°, nozzle hole diameter is ø0.33*3+ø0.35*2, injection timing is BTDC 12°CA and turbocharger is T02 model which are compressor 0.6A/R+46trim and turbine 1.0A/R+57trim.

[디젤엔진부문] 흡기유동 및 연료분사계가 과급식 디젤엔진의 성능에 미치는 영향에 관한 연구

윤준규(Junkyu Yoon),이준서(Jooseo Lee),차경옥(Kyungok Cha) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1

The effects of intake port flow and fuel injection system on the performance of turbocharged 01 diesel engine was studied in this paper. Intake flow and fuel injection system are important factors which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the atomization characteristics. Through these experiments its can be expected to meet performance and emission by optimizing the parameters; the swirl ratio of intake port, injection timing, compression ratio, nozzle hole diameter, and so on. The swirl ratio for ports was modified by hand-working and measured by impulse swirl meter. For the effects on performance and emission, the brake torque, BSFC were measured by engine dynamometer and NOx, smoke were measured by gas analyzer and smoke meter.<br/> The optimum results which is tested as available parameters for better performance and emission are as follows; the swirl ratio is 2.43, injection timing is BTOC 13' CA, compression ratio is 15.5, nozzle holder spring is 2 stage, nozzle hole diameter is Φ 0.31*5<br/>

[디젤엔진부문] 터보과급 디젤엔진의 성능 및 배기가스특성에 관한 연구

윤준규(Junkyu Yoon),차경옥(Kyungok Cha) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The characteristics of performance and exhaust emission in a turbocharged D.I. diesel engine was studied experimentally in this paper. The system of intake port, fuel injection and turbocharger are very important factors which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the combustion characteristics.<br/> The optimum results which is tested as available parameters for better performance and emission are as follows; the swirl ratio is 2.43, injection timing is BTDC 13' CA, compression ratio is 16, combustion bowl is re-entrant 5' , nozzle hole diameter is ?? 0.28*6, turbocharger is GT40 model which are compressor A/R 0.58 and turbine A/R 1.19.<br/>

다성분 혼합연료를 이용한 디젤 분무 및 연소특성의 광계측 진단

윤준규(Junkyu Yoon),명광재(Kwangjae Myong),千田 二郞(Jiro Senda),藤本 元(Hajime Fujimoto),차경옥(Kyungok Cha) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.5

This study was to analyze the effect of mixed fuel composition and mass fraction on the characteristics of evaporating diesel spray and combustion under the various ambient conditions. The characteristics of vaporization distribution and combustion were visualized by laser induced fluorescent method and direct photography. The experiments were conducted in the constant volume vessel and rapid compression expansion machine with optical access. Multi-component fuels mixed i-octane, n-dodecane and n-hexadecane were injected the vessel and rapid compression expansion machine with electronically controlled common rail injector. Experimental results show that fuel vapor formed stratified distribution. And vaporization and diffusion are become actively increasing in mass fraction of low boiling point component. Consequently multi-component fuels were expected to control the evaporating behavior according to their suitable mass fraction.

과급식 디젤 엔진의 성능개선 및 배기가스 저감에 관한 실험적 연구

윤준규(Junkyu Yoon),차경옥(Kyungok Cha) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.5

The performance improvement and emission reduction in a turbocharged D.I. diesel engine was studied experimentally in this paper. The system of intake port, fuel injection and turbochager are very important factors which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the combustion characteristics. Through these experiments it can be expected to meet performance and emission by optimizing the main parameters; the swirl ratio of intake port, fuel injection system and turbocharger. The swirl ratio of intake port was modified by hand-working and measured by impulse swirl meter.<br/> Through this steady flow test, we knew that the increase of swirl ratio is decreasing the mean flow coefficient, whereas the gulf factor is increasing. And the optimum results of engine<br/> performance and emission are as follows; the swirl ratio is 2.43, injection timing is BTDC 13?? <br/> CA, compression ratio is 16, combustion bowl is re-entrant 5?? , nozzle hole diameter is ?? 0.28*6, turbocharger is GT40 model which are compressor A/R 0.58 and turbine A/R 1.19.

EDR 데이터를 활용한 프로그램 신뢰성에 관한 연구

최용순(Yongsoon Choi),윤준규(Junkyu Yoon) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

사고기록장치(EDR)는 2015년 12월부터 자동차관리법규정으로 시행되어 교통사고 발생 시 EDR를 추출하여 사용하고 있다. EDR은 교통사고 발생 상황인 에어백이 전개된 경우, Pre-tensioner가 작동된 경우, 속도변화 누계가 8km/h 이상인 경우에 따라 충돌 이전 -5sec까지의 차량 속도(km/h), 엔진회전수(rpm), 스로틀밸브 열림량(%), 가속페달 변위량(%), 제동페달 작동여부, ABS 작동여부, ESC 작동여부, 핸들 각도(deg) 등으로 필수 데이터 15개와 선택적 추가 데이터로 나타나 있어 교통사고 발생 시 핵심적인 역할을 하고 있다. EDR를 활용한 연구는 교통사고 분석 프로그램 PC-Crash를 활용한 신뢰성 평가가 연구된 바 있지만, 각 제조사에서 개발되고 있는 자율주행차의 핵심 센서인 카메라(Camera), 레이다(Radar), 라이다(Lidar), 초음파(ultrasonic)센서 등을 반영한 교통사고 시뮬레이션이 필요한 상황이다. PC-Crash의 Active Safety기능으로 첨단운전보조시스템(ADAS)의 자동긴급제동장치(AEB)는 적용할 수 있지만 카메라, 라이다, 초음파센서를 활용하기는 어렵다. 이로 인해 자율주행차의 각 센서를 반영할 수 있는 IPG사의 CARMAKER 프로그램으로 자율주행차 분석이 필요한 상황이다. 본 연구에서는 (유)삼송에서 국내 교통사고 데이터베이스(ACCC)화 자료와 미국 도로교통안전국(NHTSA)의 EDR 데이터를 기반으로 두 프로그램 PC-Crash, CARMAKER에 적용한 결과 EDR의 속도 1km/h ~ 210km/h까지 속도 별 오차 확인 결과 저속일 때 오차율은 크게 나타나는 것을 확인할 수 있지만 속도 오차는 크지 않은 것으로 EDR를 바탕으로 두 프로그램의 신뢰성을 확인할 수 있었다. 따라서 본 연구에서 사용한 EDR 데이터로 두 프로그램의 신뢰성 연구를 통해 자율주행차 사고 시 활용 될 수 있을 것으로 기대된다.

머신러닝을 이용한 후미추돌 사고의 차량 유효충돌속도 예측 모델 개발에 대한 연구

백세룡(Seryong Baek),윤준규(Junkyu Yoon),임종한(Jonghan Lim) 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.3

With the increasing number of vehicles equipped with ADAS(Advanced Driver Assistance Systems), passenger injury characteristics are changing in the event of a collision. AEBS(Autonomous Emergency Braking System) is the representative ADAS. It is a system that activates the brake to avoid collision, or mitigate impact in a collision risk situation. Recent rear-end collisions tend to be low-speed collisions because collisions are completely unavoidable in all accident situations. Low-speed collisions have a relatively higher risk of causing neck injuries than other types of injuries. The characteristics of neck injuries vary from person to person. Neck injuries are generally known to occur at an effective collision speed of 8 km/h or higher. In this study, actual crash test data were programmed as machine learning techniques to derive effective collision speeds under collision conditions. As a result, we have developed a model that could induce effective collision speeds from vehicle collisions. The developed model can calculate an effective collision speed by taking into account the speed, weight, angle, and offset of the vehicle. Using the developed model, it is possible to estimate the seriousness of a passengers neck injuries in traffic accidents without using any other analysis program.

보행신호를 대기하는 보행자의 안전에 관한 연구

김한솔,백세룡,최용순,윤준규,임종한,Kim, Hansol,Baek, Seryong,Choi, Yongsoon,Yoon, Junkyu,Lim, Jonghan 한국자동차안전학회 2021 자동차안전학회지 Vol.13 No.3

The number of big traffic accident cases of pedestrian death appeared to be minor, however compared to death rate in car to car accidents is very high and quite a few of the pedestrian death rates among all traffic accidents are counted to be almost 40%. Previous pedestrian safety studies were mostly aimed at reducing the degree of pedestrian injuries from a vehicle to pedestrian collision, and less at preventing a collision itself. This research was conducted with a method of using road facilities to prevent vehicles from rushing into the sidewalk. This research used one of the collision analyzing programs, called PC-Crash to simulate the vehicle rushing into the sidewalk. Based on the program, it could derive an optimal safe zone location where the pedestrian can wait for the pedestrian light safely. Also, changing road facilities such as pedestrian light pillars or signal controllers can widen 440% compared to the present safe zone. Accordingly, researchers have to consider a method to analyze and apply pedestrian safe zones along with road facilities location when designing a road.

실린더 라이너의 열변형에 대한 수치적 해석 및 측정에 관한 연구

천동준(Dongjoon Chun),윤준규(Junkyu Yoon),임종한(Jonghan Lim) 한국항공우주학회 1998 韓國航空宇宙學會誌 Vol.26 No.2

CNG 발열량 변화가 Diesel-천연가스 혼소엔진 배기 특성에 미치는 영향

장형준(Hyongjun Jang),윤준규(Junkyu Yoon),이선엽(Sunyoup Lee),김용래(Yongrae Kim),김정환(Junghwan Kim),김창기(Changgi Kim) 한국가스학회 2016 한국가스학회지 Vol.20 No.6

전 세계적인 천연가스 저열량화 추세에 따라 우리나라 천연가스 열량 기준이 기존의 표준 열량제에서 보다 유연한 열량범위제로 개선되었다. 이 같은 변화는 가정이나 산업체 전반에 걸쳐 가스기기 성능에 직접적인 영향을 미치기 때문에 이를 규명하고자 하는 연구가 필요하다. 특히 열병합 발전용 엔진으로 사용되는 디젤-CNG 혼소엔진의 경우 도시가스를 주 연료로 사용하기 때문에 발열량 변화는 발전 사업자의 수익성 확보와 연관되는 중요한 사안이다. 따라서 본 연구에서는 열량범위제 내에서 허용하는 CNG 발열량 변화가 디젤-CNG 혼소엔진의 배기특성에 주는 영향에 대해 조사하였다. 도시가스 발열량 변화를 모사하기 위해 열량 범위 상한선인 10,400 kcal/Nm³의 CNG 연료에 질소를 희석시켜 발열량을 10,400 kcal/Nm³에서 9,400 kcal/Nm³까지 변경하였다. 혼소율 80% 조건에서 디젤 연료 분사 시기는 16 CAD BTDC, 분사압력은 110 MPa로 고정하고 엔진회전수 및 토크는 1800 rpm/500 Nm으로 설정하여 시험을 수행하였다. 엔진시험 결과 발열량이 감소할수록 불완전연소가 증가하여 THC, CH₄ 및 CO 배출량은 증가하는 반면 NOx 배출량은 감소함을 확인하였다. 그리고 이 같은 결과를 바탕으로 배기 특성 변화에 대해 대응할 수 있는 방안에 대해 고찰하였다. In this paper, purpose of study is emissions characteristics according to effects of heating value variations of CNG fuel in a dual-fuel engine fueled by diesel and natural gas. For heating value variation of CNG fuel, nitrogen gas was mixed with pure CNG fuel. So the higher heating value was changed from 10,400 kcal/N㎥ to 9,400 kcal/N㎥. Under one condition of CNG substitution rate was fixed at 80%, diesel fuel was injected at a fixed injection timing of 16 CAD BTDC and fuel pressure was also fixed at 110 MPa. The condition of tested engine was 1800 rpm and 500Nm. Emissions were sampled in exhaust pipe was located at downstream turbocharger. As a result, emissions characteristics were checked in heating value variations of CNG fuel with mixed nitrogen gas THC, CH₄ and CO emissions decreased and NOx and CO₂ increased.