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윤원석(Wongseok Yoon),조성태(Sungtae Cho),임원식(Wonsik Lim),박영일(Yeong-il Park),이장무(Jang Moo Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Toyota Hybrid System (THS) of Toyota Prius combinates its three power sources (engine, motor and generator) in a highly efficient way using the planetary gear. To analyze the dynamic characteristics of the system, authors made a mathematical model of the system and developed a simulator using the model. We presented several driving conditions of the vehicle, such as ZEV mode, HEV mode and conducted simulations of THS according to the driving conditions. The torque and the speed of each power sources were predicted in the simulations and suggestions for the HEV control algorithm were made with the results. Also, directions for the sizing of the generator were developed for the optimal engine operation.
하이브리드 자동차용 듀얼 유성기어 시스템 제어 알고리즘 개발
김남두(Namdoo Kim),김정민(Jeongmin Kim),조성태(Sungtae Cho),김현수(Hyunsoo Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a control algorithm on how to operate the IC engine and motors is proposed for a dual mode electro-mechanical variable transmission(EVT) from the viewpoint of the overall powertrain system efficiency. First, a dual mode EVT is designed, which consists of 3 planetary gears and two motors. In order to develop the control algorithm, power characteristic of the dual mode EVT is investigated by network analysis. It found from the network analysis that the speed ratio should be controlled in the range where the dual mode EVT efficiency is relatively high. Since the two motor torques depend on the EVT powertrain characteristics, dynamic equations of the EVT powertrain need to be obtained. To find out motor torques that provide the desired engine speed for high system efficiency, the motor torque control algorithm developed by inversion-based control. In order to evaluate the performance of the motor control algorithm, a performance simulator for the HEV adopting the dual mode EVT is developed using Cruise. It is found from the simulation results that the motor control algorithm proposed in this study shows improved fuel economy compared with the conventional control since the EVT is able to provide the IC engine operation on the speed ratio range, which gives high powertrain system efficiency.
인젝터 노즐 변경과 VGT 적용이 Common Rail HSDI 디젤 엔진의 부분 부하 성능에 미치는 영향
권욱(Wook Kwon),김형욱(Hyunguk Kim),조성태(Sungtae Cho),김철수(Chulsoo Kim),조성우(Sungwoo Cho),민경덕(Kyoungdoug Min) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, common rail HSDI diesel engines are expanding their applications backed by the technological innovations in air charging and high pressure fuel injection systems. VGT and common rail fuel injection systems which expand the flexibility of engine operation have become the main keyword of latest HSDI technology. In this paper the effects of using VGT and small hole injectors on emissions and fuel economy were discussed. The effects of engine operation parameters such as boost pressure. EGR fate, injection timing, injection pressure on the part load emissions and fuel economy were investigated. As a result, improvement of bsfc and NOx and noticeable large improvement of PM was possible.<br/>
네트워크 해석 기법을 이용한 도요타 하이브리드 시스템 동력 특성 해석 및 제어 알고리즘 개발
김남두(Namdoo Kim),김정민(Jeongmin Kim),이상문(Sangmoon Lee),조성태(Sungtae Cho),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Toyota Hybrid System(THS) of Toyota Prius combines its three power sources(engine, motor, and generator) in a highly efficient way using a planetary gear. The power characteristics of the THS is analyzed by the network analysis. From the network analysis, it is found that the THS should be operated in low to medium speed range due to the power circulation on high speed range, which causes the decreased system efficiency. A static simulator is developed using the network analysis and performance of the THS is evaluated in context of the base vehicle for drive line efficiency, vehicle acceleration. In addition, a THS control algorithm is presented for the control parameters using the ZEV to HEV mode change velocity, accelerator pedal opening and battery SOC. Based on the dynamic model of the THS powertrain, a dynamic performance simulator is developed using Cruise. Simulation results show that the THS is able to operate the engine at the optimal point for the best fuel efficiency according the control algorithm.