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Method For Estimating Temperature of 4WD Coupling Device Wet Clutches in Severe Operating Condition
Seo, Howon,Cha, Suk Won,Lim, Wonsik,Han, Sangchul Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.1
Due to the increasing demand for multi-purpose vehicles, there has been a noticeable increase in the sales volume of 4-wheel-drive (4WD) vehicles such as Sports Utility Vehicles (SUV). Most 4WD vehicles are equipped with a coupling device which transfers driving power to the rear drive shaft. In some severe operating condition, wet friction clutches in a coupling device generate enormous heat from friction and cause a sharp temperature increase. Excessive heat can cause thermal damage on the surface material of the clutch. Therefore, a method estimating temperature of the clutch is required to avoid thermal damage. This study suggests a method for estimating temperature of clutch. A full car dynamic model was constructed to simulate the severe driving conditions of a 4WD vehicle and the results of the experimental validation of the temperature estimation model are presented.
서호원(Howon Seo),이현섭(Hyunsub Lee),임원식(Wonsik Lim),차석원(Suk Won Cha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Most of driven power transferring devices are composed with multi plate clutches. In some severe operating condition in which high slip angular speed occurs, wet clutches generate enormous heat by friction and cause sharp temperature increase. Excessive heat can cause thermal damage on clutch material. Therefore method for prediction of clutch temperature is needed to avoid thermal damage. This study suggests a method for prediction of clutch temperature and a full car dynamic model which can simulate severe operating conditions.
상태 방정식을 이용한 습식 다판 클러치의 동적 거동 해석
서호원(Howon Seo),김기영(Kiyoung Kim),임원식(Wonsik Lim),차석원(Suk Won Cha),공진형(Jinhyung Kong) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Almost every modern passenger vehicle has an automatic transmission or power split device in case of Toyota Prius HEV which is constructed with planetary gears and wet clutches. It is important to develop a model which can analysis dynamic state of clutch in shifting phase to evaluate performance of control logics in real time situation. The model needs to be simulated in real time or semi-real time because every TCU is operating in fixed time step. Dynamic analysis simulation software like MSC.ADAMS or AMESIM does not satisfy real time performance. This research suggests a clutch analysis method that determines stick and slip state of wet clutches in an automatic transmission using state equation based on fixed step solver. A dynamic simulator model is constructed as a reference using MATLAB/SIMULNK simdriveline library. Result of simulator model is also compared with result of state equation analysis model based on fixed time step solver.
습식 클러치의 고정 시간 솔버 기반 동적 거동 해석 기술 개발
서호원(Howon Seo),임원식(Wonsik Lim),차석원(Suk Won Cha),강상욱(Sangwook Kang),공진형(Jinhyung Kong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Almost every modern vehicle has an automatic transmission(or power split device in case of Toyota Prius HEV)which is constructed with planetary gears and wet clutches. It is important to develop a model which can analysis dynamic state of clutch in shifting phase to evaluate performance of control logics. The model needs to be simulated in real time or semi-real time because every TCU is operating in fixed time step. Dynamic analysis simulation software like MSC.ADAMS or AMESIM does not satisfy real time performance. This research suggests a clutch analysis method that determines stick and slip state of clutches in an automatic transmission based on fixed step solver. A simulator model is constructed as a reference using MATLAB/SIMULNK simdriveline library. Result of simulator model is also compared with result of fixed time step analysis model.
병렬형 하이브리드 자동차의 엔진 동력을 이용한 발진 주행 동적 해석 모델 개발 및 엔진 클러치 제어
서호원(Howon Seo),김기영(Kiyoung Kim),임원식(Wonsik Lim),차석원(Suk Won Cha),정석민(Seokmin Jeong),오종한(Jonghan Oh) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
When a traction motor of a parallel type HEV(Hybrid Electric Vehicle) could not generate torque to launch, the HEV should start only with engine power. Because the engine rotates with idle speed the relative rotational speed of clutch input and output shaft starts from engine idle speed and ends to zero when clutches engaged. In this study a method for control pressure command of engine clutch is proposed to satisfy desired clutch engagement time and decrease shock. A dynamic model of a parallel type HEV powertrain (including hydraulic clutch control components) is constructed to validate the method proposed.
하이브리드 전기 자동차의 주행 모드에 따른 회생제동 토크 분석
서호원(Howon Seo),이윤호(Yoon Ho Lee),차석원(Suk Won Cha),최종대(Jongdae Choi),양시우(Si Woo Yang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Regenerative Braking is main issue of Hybrid Electric Vehicles(HEV). To analysis regenerative braking torque of HEV driving experiment is performed by using a test HEV in various driving modes. Driving modes are CITY MODE, HIGHWAY MODE and ROUTE MODE. Torque is measured by torque sensor attached to driving shaft during experiments. In this study, sheer type strain gages are used to construct torque sensor and telemetric signal amp is used to transport and amplify sensor signal of rotating drive shaft. Torque data of each cycle are sorted by vehicle speed and applied torque range. Characteristic of torque data of each driving mode is represented by time distribution map. Torque data of each driving mode can be used for development of control strategy and criteria of durability test for HEV mechanical components.
서호원(Howon Seo),이대흥(Daehueng Lee),김남욱(Namwook Kim),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In these days, how to use hybrid system technology , which has been successfully used in automobiles, in construction machinery become an issue. The primary focus of this study is to construct a computational model that can be operated like a conventional hydraulic machine, by using AMESim the hydraulic analysis tool. Then by adding compound type hybrid powertrain which contains electric swing motor, this study completes a hybrid hydraulic system model. And this model show us a resonable prediction of the dynamic performance of hybrid hydraulic machine.
순간적으로 병진운동하는 2차원 원형실린더 주위 유동장의 확산와류방법 연구
서호원(Howon Seo) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.6
순간적으로 병진운동하는 2차원 원형실린더 주위의 점성유동장을 확산와류방법에 의해 계산하였다. 선두후류와 주후류의 상세한 발달 상태를 조사하였으며 Re=1200, 9500의 유선형상, 주후류의 크기, 후방 대칭축 축방향속도 계산는 보고된 실험결과와 근접하였다. Re=1200 유동장 후류의 τ=50까지의 장기간 동안의 발달 상태를 조사하였다. 후방후류의 와류이탈주파수는 보고된 결과와 근접 하게 나왔다. In this study the development of the two dimensional flowfield around an impulsively translated circular cylinder is numerically simulated using the diffusion vortex method. A detailed streamline pattern of fore wake and main wake of Re=1200, 9500 flowfields are investigated. The results of streamline pattern, the size of main wake and the axial velocities along the rear symmetry axis of the circular cylinder show good agreement with the reported experimental results. The long term wake delvelopment for Re=1200 flow field was calculated up to τ=50. The vortex shedding frequency shows the similar value as that of reported.
Fixed time step solver 기반의 준 실시간 클러치 해석 모델 개발
서호원(Howon Seo),김남욱(Namwook Kim),이대흥(Daehueng Lee),임원식(Wonsik Lim),차석원(Suk Won Cha) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
It is important to develop a model that can characterize dynamic features of transmission in shifting phase to evaluate performance of a controller for an automatic transmission system. And it is very essential to develop a technique that realize dynamic features of clutches that construct a transmission to develop that model. Moreover that model needs to be simulated in real time or semi-real time. But other dynamic analytic simulator software like MSC.ADAMS or AMESim can’t satisfy that feature. So in this research we develop a clutch model that determines stick and slip state of clutches included in a transmission based on fixed step solver.