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통합 제어 밸브 적용 가솔린차량의 냉각수 온도 제어 전략 개발
안영국(Youngkuk An),박진일(Jinil Park),이종화(Jonghwa Lee),최두원(Duwon Choi),하승찬(Seungchan Ha) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
차량 열관리시스템(VTMS)은 보다 엄격한 CO2규제에 대응하고 차량의 성능을 개선하기 위해 채택이 확대되고 있는 기술이다. VTMS 기술 중 하나인 전자식 통합유량밸브(ECV)는 기계식 서머스탯을 대체하여 차량의 냉각시스템을 보다 효과적으로 제어하며, 이를 통해 자동차의 연비향상에 기여하는 시스템이다. ECV 시스템은 엔진 오일 온도와 냉각수 온도를 기계식 시스템보다 높은 온도에서 제어하여 엔진의 마찰손실을 줄이고, 필요 시 즉각적인 밸브 개도 제어를 통해 냉각 유량을 확보해 엔진의 온도를 안정적으로 유지함을 목적으로 한다. 기계식 시스템과 달리 ECV 적용 시스템에서는 전자제어장치와 제어전략이 요구되며 제어전략에 따라 그 성능도 달라지게 된다. 본 연구는 ECV 시스템이 적용된 1L급 가솔린 차량의 온도제어 전략을 수립하는 것을 목표로 한다. 이를 위해 먼저 차량의 요소별 온도거동을 예측하는 시뮬레이션 환경을 구축한다. 이를 활용하여 다양한 제어전략의 특성 및 결과를 비교, 분석하고 최적제어전략을 도출하고자 한다. 제어 대상 차량은 1L급 가솔린 차량으로 기계식 서머스탯을 제거하고 ECV 시스템을 적용하였으며, 차량시험과 단품시험을 통해 온도 예측 시뮬레이션을 위한 냉각시스템 모델링을 수행한다, 시뮬레이션 성능 및 오차는 차량 모드 주행시험(FTP-7, HWFET)과 실도로 시험 결과를 비교하여 검증하였다. 완성된 시뮬레이션 환경을 활용하여 ECV 시스템의 제어 로직 및 제어변수값에 따른 온도거동을 비교 분석 하였다. 적용된 제어로직은 PID제어와 모델기반 제어이다.
원통형 리튬 이온 배터리 셀의 방전 조건에 따른 열적 특성 모델링
최원세(Won-Se Choi),김한상(Han-Sang Kim),임종훈(Jong-Hoon Im),최승현(Seung-Hyon Choi) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
With growing concerns over fossil fuel depletion and the increasing price of crude oil, hybrid electric vehicles (HEVs), electric vehicles (EVs) and fuel cell vehicles (FCEVs) have gained more interest as a mode of transportation. Especially EV is spotlighted because platform is simple and can be easily tuned with different size motors, batteries and gear ratio. The battery is the main energy provider which is responsible for the supply of all the electric components. But the battery cell voltage and life time are various depending on the temperature and SOC at charging-discharging conditions due to internal resistance. Hence a battery thermal management system that can provide a suitable temperature environment for working batteries is important. This paper will build an electro-thermal model which can simulate a thermal performance of NCR18650B Li-ion battery cell and developed electro-thermal model will be applied to 1D and 3D CFD codes, CRUISE M and FIRE.
한수동,김성균,김치명,박용선,안병기 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5
The TMS(Thermal Management System) heater in a fuel cell vehicle has been developed to prevent a decline of fuel cell durability and cold start durability. Main functions of the COD(Cathode Oxygen Depletion)heater are depletion of oxygen in a cathode as heat energy and consumption of electric power for rapid warming up of a fuel cell stack. This paper covers subjects including the design specification of a heater, heater controller for detection of overheat and reliability assessment including coolant pressure cycle test of a heater. To verify the design concept, burst pressure and deformation analysis of plastic housing were carried out. Also, temperature distribution analysis of heater surface and coolant inside of housing were carried out to verify the design concept. By designing the plastic housing instead of a steel housing, the 30% weight lightening and 50% cost reduction were attained. A module-based design of a TMS system including a heater or reducing the watt density of a heater is a problem to be solved in the near future work.
리튬 이온 배터리의 열적 특성을 고려한 전기자동차 시뮬레이션 모델링 및 성능 분석
최원세(Wonse Choi),박태상(Taesang Park) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
With growing concerns over fossil fuel depletion and the increasing price of crude oil, hybrid electric vehicles (HEVs), electric vehicles (EVs) and fuel cell vehicles (FCEVs) have gained more interest as a mode of transportation. Especially EV is spotlighted because platform is simple and can be easily tuned with different size motors, batteries and gear ratio. Among electric vehicle components, batteries play an increasingly critical role because the performance of EV is highly dependent on battery capacity. Specially the battery temperature is critical factor for battery operating performance. In order to investigate EV performance according to battery temperatures, this paper builds an electro-thermal model of Li-ion battery and EV powertrain using 0D/1D simulation code, AVL CRUISE M. The EV powertrain model is validated with energy consumption and 0-100km/h performance. Also, 3D CFD model of battery using AVL FIRE M is modeled which uses the same electro-thermal model and parameters with 1D battery model. This model will be used as battery cells of battery module in future research to model the battery thermal management systems (BTMS) in 0D/1D and 3D.
100kw급 수소전기차용 열관리시스템의 최적제어를 위한 통합유량제어밸브의 수치모델 검증
정수진(Soo-Jin Jeong),문성준(Seong-Joon Moon),최지현(Ji-Hyun Choi),강지훈(Jihoon Kang),이검수(GumSu Lee) 한국자동차공학회 2022 한국자동차공학회 지부 학술대회 논문집 Vol.2022 No.5
The ever growing importance of effective and efficient thermal management will no doubt benefit the quest for more efficient fuel-cell vehicle. Therefore, delicate electrical based cooling system enhanced functionalities are in high demand. To meet such demand, an ICCV(integrated coolant control valve) which will replace the former wax thermostat has been developed. Analysis of cooling system at initial phase of product development will help in optimum design of the system and better performance of engine. Hence, 1D (one dimensional) simulation tools place a major role. The aim of this study is to validate several thermodynamic and 3D CFD models of Penta-Control Coolant Valve in terms of accuracy and cost-effectiveness by comparing each models. PCCV was numerically modeled based on junction and chamber with 1D pipes and its prediction performance is validated by the results of 3D CFD simulations. The results show that thermodynamic models produced very large discrepancies ranging from 30% to 150% in case of large opening area of stack port because of strong three-dimensional turbulence effect. From the results of this study, it is found that thermodynamic models is not able to reflect the complex three dimensional flow characteristics in PCCV leading to a erroneous pressure drop and flow distribution in case of large opening area of stack port.
움직임 격자법을 이용한 100kW 수소연료전지 자동차용 5방향 냉각수 제어밸브의 비정상 동적 내부 유동특성 해석
정수진(Soo-Jin Jeong),문성준(Seong-Joon Moon),이검수(GumSu Lee),강지훈(Jihoon Kang) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
The aim of this study is to investigate dynamic flow characteristics of the fluid flow through Penta-Control Coolant Valve by comparing to steady state CFD simulation. To achieve this goal, the present paper attempts the dynamic simulation of the fluid flow through PCCV using a commercial CFD solver with moving mesh technique. Firstly, dynamic flow characteristics and the energy loss inside the PCCV ball valve during the opening and closing process was analyzed. It is found that the discrepancies between dynamic and steady state simulation is larger when the rotating degree is in ranging from 40 to 50 degree, while the fluid resistance is very small at the rest of the degree. Then, the dynamic flow characteristics of the PCCV ball valve at different spool rotational speeds were investigated. It is found that the velocity value and the flow turbulence are gradually increased when the spool rotational speed increases from 94 deg/s to 47 deg/s. It is also founded that faster rotating speed of ball valve leads to larger discrepancies between dynamic and steady CFD simulation in terms of accuracy of mass flow prediction. Finally, dynamic thermal mixing characteristics during the valve opening and closing process with different rotating velocity were analyzed. It is found that the difference between dynamic and steady simulation is increased with increasing rotating speed. It is helpful for the design of ball valves opening strategy and the improvement of the whole FCEV thermal management system.