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이헌균(Heonkyun Lee),허형석(Hyungseok Heo),황재순(Jaesoon Hwang),배석정(Sukjung Bae),정재우(Jaewoo Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, improvement of vehicle economy at low temperature operating condition has become an issue. Utilizing waste heat of exhaust gas is effective to improve the overall vehicle economy. The exhaust heat recovery system transfers the thermal energy from “hot” exhaust gas to “cold” engine coolant, and heated coolant reduces engine warm-up time. Therefore, it is possible that vehicle economy is enhanced by reduced engine fiction loss. The current work evaluated the effect of the exhaust heat recovery system applied to the PHEV engine. Results showed an improvement of warm-up time for the engine thermal management system by use of the heat recovery system. Moreover, the warm-up characteristics were analyzed according to the variation of the thermal management system layout.
스풀 밸브 적용을 위한 텍스처링 표면의 마찰 특성 해석에 대한 연구
이헌균(Heonkyun Lee),이준용(Junyong Lee),허형석(Hyungseok Heo),한정민(Jungmin Han) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The oil leakage of control valves is the major cause of energy loss in a automatic transmission. Applying the micro texturing technology to the spool surface of control valves is effective to improve the lubricating characteristics of the spool and decreasing the oil leakage from the automatic transmission parts. In this study, the flow characteristics of the textured surface were analyzed by the computational fluid dynamic method and the friction characteristics of the textured surface were analyzed by the tribological experiments. Also, the influence on the flow and friction characteristics of the various textured shape and arrangement have been investigated.
이헌균(Heonkyun Lee),봉선우(Seonwoo Bong),허형석(Hyungseok Heo),권혁주(Hyuckju Kwon),한정명(Jungmyeongn Han) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
Reducing engine warming up time is one of the best way to improve fuel economy. High viscosity at low temperature of ATF oil takes up energy loss in a automatic transmission system and deteriorates gas mileage. An ATF heat exchanger reduces engine warming up time by elevating the ATF temperature quickly and regulates the temperature appropriately to ensure lubricating characteristics by heat transfer between the coolant and ATF. In this study, the heat transfer characteristics of the plate type ATF heat exchanger is analyzed by the computational fluid dynamic method. The influence on heat transfer characteristics have been investigated with respect to various design parameters of the heat transfer fin.
커먼레일 시스템의 고압 연료 배관 체결부 축력 예측에 관한 연구
이헌균(Heonkyun Lee),김현철(Hyunchul Kim),허형석(Hyungseok Heo),나병철(Byungchul Na),이봉현(Bonghyun Lee),추성화(Seonghwa Choo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Tube fitting is the one of the basic element in the vehicle. Tube fitting adopted in common rail system is exposed in high pressure above 1,300bar in continuance. Particularly, operating condition of common rail is tending severe, because fuel injection pressure of engine is elevating on demand for vehicle performance improvement. The key point of tube fitting design to prevent the leakage is appropriate assembly torque and axial force. This paper mentions estimation method of axial force in high pressure tube fitting for common rail system and relationship between the torque and axial force. In proportion to tightening nut, the plastic deformation behavior of high pressure tube fitting has analyzed by FEM(finite element method) and axial force has estimated by computation result of reaction force between common rail and tube end.
이헌균(Heonkyun Lee),이준용(Junyong Lee),허형석(Hyungseok Heo),황병성(Byeongseong Hwang),이재문(Jaemoon Lee),김홍기(Hongki Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Recently, the electric driven auxiliary vacuum pump is becoming widely used to assist braking performance of vehicle. In this paper, the performance of the vane type vacuum pump is analyzed by computational fluid dynamic method. The characteristic of the flow rate and pulsation of discharge pressure is predicted on the vacuum pump including an vane, rotor and cam ring. Also, the influence on the performance of the various design factors of discharge port has been investigated such as position size and number of hall.
냉각수 제어 밸브 일체형 ATF 열교환기 적용이 연비에 미치는 영향에 대한 연구
이헌균(Heonkyun Lee),봉선우(Seonwoo Bong),권혁주(Hyuckju Kwon),한정명(Jungmyeongn Han),정진규(Jinkyu Jung) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
An ATF heat exchanger reduces transmission warming up time by elevating the ATF temperature quickly and regulates the temperature appropriately to ensure lubricating characteristics by heat transfer between the coolant and ATF. In another aspect, heat transfer from the coolant to the ATF causes insufficient energy to heat the cabin. In this study, the heat transfer characteristics of the plate type ATF heat exchanger is analyzed. the flow pattern of Coolant control valve is analyzed by the computational fluid dynamic method. The influence on fuel economy vehicles With a plate type ATF heat exchanger integrating a coolant control valve have been investigated.
이헌균(Heonkyun Lee),이준용(Junyong Lee),허형석(Hyungseok Heo),강융환(Yunghwan Kang),성창원(Changwon Sung),정홍진(Hongjin Jung) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Corresponding to the regulations with noise fuel consumption, the semi-active muffler applying the exhaust valve is becoming widely used. The exhaust valve is seated on the inside of the muffler for achieving the function of noise reduction and enhanced back pressure. In this paper, the performance of the butterfly type exhaust valve is analyzed by computational fluid dynamic method. The characteristic of the flow pattern and applied hydraulic torque is predicted on the exhaust valve with respect to a opening ratio. Also, the influence on the performance of the various operating condition and design factor has been investigated such as exhaust gas flow rate and temperature.
엔진 급속 웜업을 위한 배기열 재순환 장치의 열유동 특성 평가
이헌균(Heonkyun Lee),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),배석정(Sukjung Bae),황재순(Jaesoon Hwang),정영대(Youngdae Choung),이상헌(Sanghun Lee),김태진(Taejin Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, A number of researchers have focus their attention on reusing thermal energy of waste heat in exhaust gas. The exhaust heat recirculation system is one of the waste heat recovery system. It reduces engine warming up time by elevating coolant temperature quickly by heat transfer between coolant and exhaust gas. Therefore, it is possible that vehicle economy is enhanced by the reduced engine fiction loss. This paper presents the performance estimation of exhaust heat recirculation device by computational fluid dynamic method. Moreover, heat transfer characteristics are analytically investigated via operating conditions.
무용접 경량화 자동차 조향 샤프트의 설계 변수 변화에 따른 구조 해석
이헌균(Heonkyun Lee),김현철(Hyunchul Kim),김충희(Chunghui Kim),나병철(Byungchul Na),허형석(Hyungseok Heo),이봉현(Bonghyun Lee),이기수(Geesoo Lee),배석정(Sukjung Bae),김홍근(Hongkeun Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steering system is a one of major safe device in vehicle. Universal shaft adopted in steering system transmits steering torque between steering column and steering gear and protect the driver from being damaged by an accident. Conventionally, universal shaft is composed of two components, i.e. shaft and pipe. Two components are connected by a bellows or serration linkage. In this paper, structural analysis is achieved for a serration type non-weld forged universal joint. A simple universal shaft model is proposed to simplify the structural analysis process, the parameter study is performed to evaluate the effect on the structural analysis of the design parameters such as thickness of universal shaft, shape and length of serration.