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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.
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.
하이브리드 자동차용 EVT(electro-mechanical variable transmission)의 특성해석
김정민(Jeongmin Kim),김남두(Namdoo Kim),이상문(Sangmoon Lee),조성태(Sungtae Cho),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In design of the hybrid electric vehicles(HEVs), a power mixing unit(PMU) which combines or splits the power of the IC engine and the motor is an integral element. In this paper, a comparative analysis of the hybrid PMU has been performed for one mode and two mode EVT(electro-mechanical variable transmission). One mode EVT consists of one planetary gear and two motors, which can be found in Toyota hybrid system(THS). The two mode EVT consists of two planetary gears, two clutches and two motors. The two mode EVT is able to offer two power transmission modes by controlling the clutch combination. In order to investigate the torque and speed characteristics of the both EVT, the network analysis is carried out. It is seen from the network analysis, that the two mode EVT shows better fuel economy and requires relatively smaller electric machine size.
자동변속기 토크컨버터 록업 및 연비 성능 시뮬레이터 개발
김태성(Taesung Kim),김남두(Namdoo Kim),장재덕(Jaeduk Jang),김현수(Hyunsoo Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a AMESim vehicle performance simulator is developed for automatic transmission with torque converter. Using the simulator lock-up and slip control area of the torque converter derived for a given torque converter. It is found that the fuel economy by the simulation is in good accordance with the test results which demonstrates the validity of the simulator. It is also found that the fuel economy can be improved approximately 3% in case of slip control of the lock-up clutch. It is expected developed in this paper can be used to design and evaluate the performance of the lock-up clutch and torque converter for automatic transmission vehicle.
이상문(Sangmoon Lee),김정민(Jeongmin Kim),김남두(Namdoo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a power mixing unit(PMU) which combines or divides the power from the IC engine and the motor for a hard type parallel hybrid electric vehicle. The PMU consists of compound planetary gear and 4clutches to provide the operation mode such as EV, HEV, and Engine only mode. In order to investigate the power flow characteristics of the PMU, dynamic models of the hard type HEV with the PMU are obtained. It is found from the simulation results that the PMU developed in this study is able to provide EV mode, HEV mode and Engine only mode according the shift schedule.