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여훈(Hoon Yeo),김동현(Donghyun Kim),김달철(Talchol Kim),김철수(Chulsoo Kim),황성호(Sungho Hwang),김현수(Hyunsoo Kim) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
In this paper, a regenerative braking algorithm is proposed to make the maximum use of the regenerative braking energy for an independent front and rear motor drive parallel HEV. In the regenerative braking algorithm, the regenerative torque is determined by considering the motor capacity, motor efficiency, battery SOC, gear ratio, clutch state, engine speed and vehicle velocity. To implement the regenerative braking algorithm, HEV powertrain models including the internal combustion engine, electric motor, battery, manual transmission and the regenerative braking system are developed using MATLAB, and the regenerative braking performance is investigated by the simulator. Simulation results show that the proposed regenerative braking algorithm contributes to increasing the battery SOC, which recuperates 60 percent of the total braking energy while satisfying the design specification of the control logic. In addition, a control algorithm which limits the regenerative braking is suggested by considering the battery power capacity and dynamic response characteristics of the hydraulic control module.
HILS 를 이용한 CVT 장착 병렬형 하이브리드 차량의 변속제어 성능해석
여훈(Hoon Yeo),류완식(Wansik Ryu),이희라(Heera Lee),김달철(Talchol Kim),김철수(Chulsoo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In this paper, performance of CVT ratio control system is investigated for a parallel hybrid electric vehicle(HEV) .<br/> Since the CVT shift dynamics has a nonlinear characteristics due to the time delay of the shift mechanism, belt<br/> elasticity, and the inherent nonlinearity of the hydraulic system, a hardware in the loop simulation(HILS) is used to<br/> evaluate the dynamic characteristics of the ratio control system on the engine performance of the HEV. In the HILS,<br/> the CVT belt-pulley and the hydraulic control valves are used as hardwares and other powertrain components of the<br/> HEV such as engine, motor, battery are used as software models using MATLAB SIMULINK. From HILS, it is<br/> found that the dynamic response of the CVT system affects the optimal operation of the engine and closed-loop<br/> control of the CVT ratio gives better engine performance on the optimal operation line.
여훈(Hoon Yeo),김달철(Talchol Kim),김철수(chulsoo kim),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
A regenerative braking algorithm and a hydraulic module are proposed for a parallel hybrid electric vehicle equipped with a CVT. The regenerative algorithm is developed by considering the battery state of charge, vehicle velocity and motor capacity. The hydraulic module consists of a reducing valve and a power unit to supply the front wheel brake pressure according to the control algorithm. In addition, a stroke simulator is designed to provide a similar pedal operation feeling. In order to evaluate the performance of the regenerative braking algorithm and the hydraulic module, a hardware in the loop simulation(HILS) is performed. In the HILS, hardwares of the brake system which consists of four wheel brakes and the hydraulic module are used. Dynamic characteristics of the HEV is simulated using a HEV simulator. In the HEV simulator, each element of the HEV powertrain such as Ie engine, motor, battery, eVT is modeled using MATLAB SIMULINK. In the HILS, a driver operates the brake pedal by his foot work while the vehicle speed is displayed on the monitor in the real time. It is found from the HILS that the regenerative braking algorithm and the hydraulic module suggested in this paper provide a satisfactory braking performance in tracking the driving schedule and maintaining the battery SOC.<br/>
회생제동 전자제어 유압모듈을 이용한 하이브리드 차량의 에너지 회수 알고리즘 개발
여훈(H. Yeo),김현수(H. S. Kim),황성호(S. H. Hwang) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.4
In this paper, an energy regeneration algorithm is proposed to make the maximum use of the regenerative braking energy for a parallel hybrid electric vehicle(HEV) equipped with a continuous variable transmission(CVT). The regenerative algorithm is developed by considering the battery state of charge(SOC), vehicle velocity and motor capacity. The hydraulic module consists of a reducing valve and a power unit to supply the front wheel brake pressure according to the control algorithm. In order to evaluate the performance of the regenerative braking algorithm and the hydraulic module, a hardware-in-the-loop simulation (HILS) is performed. In the HILS system, the brake system consists of four wheel brakes and the hydraulic module. Dynamic characteristics of the HEY are simulated using an HEY simulator. In the HEY simulator, each element of the HEY powertrain such as internal combustion engine, motor, battery and CVT is modelled using MATLAB/Simulink<SUP>®</SUP>. In the HILS, a driver operates the brake pedal with Ius or her foot while the vehicle speed is displayed on the monitor in real time. It is found from the HILS that the regenerative braking algorithm and the hydraulic module suggested in this paper provide a satisfactory braking performance in tracking the driving schedule and maintaining the battery state of charge.
여훈(Hoon Yeo),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In this paper, a regenerative braking performance is investigated for a parallel hybrid electric vehicle(HEV). Firstly, a HEV performance simulator is developed and dynamic model of the brake system is obtained. Using the HEV simulator, master cylinder input force is determined. In addition, wheel cylinder pressure and the oil flow to the wheel cylinder are calculated for the front and the rear wheel. Since the oil flow to the front wheel is shut off when the regenerative braking is carried out, a device to waste the oil flow is required to provide a familiar brake pedal feeling to the driver. In this study, a stroke simulator is designed for the regenerative braking system. It is found that the stroke simulator provides a similar flow change characteristic with the existing wheel cylinder.<br/> <br/> <br/>