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김종필(Jongpil Kim),이우영(Woo-young Lee),김삼균(Samgyun Kim),하승우(Seungwoo Ha),김석준(Seokjoon Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
A two-stage LDC(Low Voltage DC-DC Converter) which has the boost converter interleaved between the high voltage battery output and full-bridge converter input is proposed in this paper. This two-stage LDC has the transformer with the high turn ratio in order to decrease the semi-conductor devices losses and increase the entire LDC efficiency finally. Using the synchronous MOSFET instead of the rectifier diode in the secondary is also proposed to maximize the total efficiency. The proposed two-stage LDC was designed to meet the condition of not only the HEV but also the PHEV. It was demonstrated by PSIM simulations and experiments that the two-stage LDC has the increased average efficiency of 94.5% and increased peak efficiency of 95.7% (which were 91.2% and 92.9% respectively in the existing LDC).
모델링 기법과 에너지 흐름 측정 방법을 활용한 하이브리드 차량의 연비 분석 및 개발
박태식(Taesic Park),김석준(Seokjoon Kim),이종호(Jongho Lee),민병순(Byungsoon Min) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
As oil prices rise and the government strengthens fuel economy regulation, fuel economy became an important factor in buying a car. To develop high mileage vehicles, analysis of effect of each component on fuel economy is needed. Effect of each component on fuel economy is calculated by measuring energy flow between components and it depends on efficiency of component and control logic of system. In this paper, analysis method for different kinds of systems such as series, parallel and power-split was described and it applied on developing vehicle. Through comparison between competitive vehicle and developing vehicle, strength and weakness of system were found and effect of system improvement was measured. Modeling technique was used to analyze control logic of competitive vehicle and show fuel economy effect of control logic.
민병순(Byungsoon Min),김인섭(Ilnsup Kim),김석준(Seokjoon Kim),이종호(Jongho Lee),이수방(Soobang Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Benchmarking is necessary for every development. Especially, its importance is emphasized in system like hybrid vehicle in which diverse parts operate complexly and make a result. Many optimization methods are used to map out driving strategy as pre-process for making driving control logic. In addition to the optimization the reverse engineered strategy of the competition vehicle with similar architecture is also used to build control logic. In this paper, optimization method, experiment data of competition vehicle, and reverse engineering process and the result of assuming driving strategy are addressed. The measurement technology to see what's happening in the competition vehicle was developed experimental results. Based on the experimental results a simulation model was built and validated.
하이브리드 자동차의 효율적 배기열회수시스템 개발을 통한 연비 개선
이재헌(Jaeheon Lee),온형석(Hyungseok Ohn),최재형(Jaeyoung Choi),김석준(Seokjoon Kim),민병순(Byungsoon Min) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Since the propulsion systems of vehicle have changed from a single energy source based on conventional internal combustion engine to hybrid system including more electrical system such as full type of hybrid electric vehicle or plug-in hybrid electric vehicles, a new transition associated with vehicle thermal management arises. The success of improved fuel economy is the proper integration of thermal management components which are appropriately performed to reduce friction and wasted energy. The thermal management systems of vehicle are able to balance the multiple needs such as heating, cooling, or appropriate operation within specified temperature ranges of propulsion systems. More efficient thermal management systems are required to improve the fuel economy in the hybrid electric vehicles because of the driving of electric traction motor and the increase of engine off time. The decrease of engine operation time may not sustain the proper temperature ranges of engine and gearbox. As an engine starts at low ambient temperature, heat from the wasted heat of exhausted gas can be supplied to engine and gearbox at initial warm-up. This research describes the one of cost effective thermal management solutions recovering exhaust gas heat exchanging system with coolant and gear box oil simultaneously. It is more advantageous to increase the temperature of the engine oil or gear box oil rather than to increase the coolant temperature. Consequently, the experimental result of this system improved 2.5% of fuel economy at UDDS drive cycles. The main benefit using exhaust gas heat recovery system is fuel economy improvement. However, to practically apply recent thermal management technologies in commercial use, not only improved performance for the low energy density but also cost in a viable vehicle package are necessary in general. Developed exhaust gas heat recovery system of integrated heat exchanger type is 6 times more competitive than coolant only type’s and more effective solution than Rankine cycle type’s in passenger vehicle.
주행 상황 예측을 통한 하이브리드 차량의 연비 향상 기술 개발
민병순(Byungsoon Min),박태식(Taesic Park),김인섭(Insup Kim),서범주(BuhmJoo Suh),이재헌(Jaeheon Lee),김석준(Seokjoon Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
It is well known that the hybrid electric vehicle (HEV) which can improve the efficiency of power train by the control of electric power source has better fuel economy than the conventional vehicles. However, the electric power source can be limited because of stability of PE components and continuity of control satisfying any driving condition so that the fuel economy may be lowered according to driving condition. At this moment, if the driving condition such as road and traffic condition can be predicted, the use of electric power source will be controlled appropriately in order to improve the fuel economy of HEV. For example, if a hill road is expected in a few minutes, the controller of HEV will charge a battery sufficiently in order to avoid operating at full load part of engine as driving on the uphill road. When the vehicle is expected to drive downhill, the battery of HEV will be discharged to low SOC so that the battery is more charged from regenerative braking than a HEV with normal control strategy during downhill. Consequently, the fuel economy of HEV is improved. Additionally, while the vehicle is predicted to meet congestion, charging the battery and discharge during congestion improve the efficiency of vehicle. This paper proposes the fuel economy improvement technique for hybrid electric vehicle by using driving condition prediction. The effectiveness of the algorithm and method for using driving environment prediction has been confirmed by PSAT simulation as well as driving test. After collecting the GPS data of a specific route, the improvement of fuel economy is confirmed by using simulation model of Sonata Hybrid at PSAT and by fleet test of Sonata HEV.
신창우(Changwoo Shin),임종욱(Jongwook Lim),이대흥(Daeheung Lee),임원식(Wonsik Lim),차석원(Sukwon Cha),박태식(Taesik Park),김석준(Seokjoon Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Drivability is an important evaluation of vehicle performance and means subjective perception for dynamic performance of a vehicle in response to driver input. For the present, drivability evaluation is subjectively evaluated by professional test drivers. This paper proposed the method for quantification of drivability in Hybrid Electric Vehicles (HEV). Proposed quantitative evaluation method consisted of five evaluation indices. The indices for drivability evaluation were selected through references which are related to ride comfort and shift quality. Based on the proposed method, drivability of HEV was evaluated quantitatively under various operation conditions. The results of these evaluations were similar to that of subjective evaluations under the same conditions.