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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.
오경철(Kyoungcheol Oh),김동현(Donghyun Kim),이희라(Heera Lee),김현수(Hyunsoo Kim),김달철(Talchol Kim),김철수(Chulsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, operating algorithms are investigated for a parallel hybrid electric vehicle (HEV). In order to estimate the performance of the HEV, a HEV simulator is developed using MA TLAB SIMULINK. Simulations are carried out for the following three algorithms: (1) power assist, (2) equivalent fuel and (3) power distribution. The simulation results show that the equivalent fuel and power distribution algorithm do not provide an improvement of the fuel economy due to the decreasing battery SOC. It is found that the power assist algorithm is best suited for a parallel HEV studied, which consists of relatively small motor and battery.
장성욱(Sungwook Jang),김달철(Talchol Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, regenerative braking system is developed for a hybrid electric vehicle. Regenerative braking system consists of BCU, hydraulic modulator and stroke simulator. In order to obtain a braking force,' a control algorithm is suggested. The hydraulic modulator modulates the brake pressure corresponding to the brake pedal operation. The stroke simulator is required to ensure the brake pedal operation felling. Using AMESim, dynamic models of a parallel hybrid vehicle with regenerative braking system are obtained including CVT. It is found from simulation results that the regenerative braking system works according to the control strategy, which promises an improved fuel economy of the HEV.
김용기(Yong-gi Kim),이희라(Heera Lee),송성재(Seongjae Song),김달철(Talchol Kim),민병순(Byungsoon Min) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this study, the optimized supervisory control strategy for full function parallel type hybrid electric vehicle (HEV) was developed. We adopted model-based optimal control, not often used rule-based control. This control structure and parameters were extracted from the results of local optimization using fuel equivalent factor. These local optimized results were compared with global optimized ones using dynamic programming, and it was confirmed that the operations from these two methods were very similar. Developed control strategy was validated by forward looking simulation, and now being tested on a prototype vehicle.
이희라(Heera Lee),김달철(Talchol Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, simplified dynamic models of line pressure and ratio control valve are suggested for a metal belt CVT. It is seen from the simulation and experimental results that simplified models describe nonlinear characteristics quite well such as narrow duty range of the ratio control valve. Based on the dynamic models, PID and fuzzy controllers are designed for the line pressure and the ratio control. In addition, line pressure control strategy are suggested for the faster shift speed. It is found from the simulation results that faster shift speed can be achieved by increasing the line pressure.
오경철(Kyoungcheol 0h),김달철(Talchol Kim),김철수(Chulsoo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Fuel economy of a hybrid electric vehicle (HEV) is directly related to operation algorithm. In this paper, operation algorithms for a parallel HEV equipped with relatively small motor are investigated to achieve minimum fuel consumption. Generally, the HEV with relatively small motor adopts a power assist algorithm in which the motor is used to assist the engine power. In order to obtain minimum fuel consumption, an equivalent fuel algorithm is proposed. In this algorithm, the electrical energy stored in the battery is considered to be an equivalent fuel and an equivalent brake specific fuel consumption (ebsfc) for the electrical energy is proposed, which is a function of the battery state of charge (SOC). In addition, in order to maintain the battery sac, weight factors are suggested. It is found from the simulations that the equivalent fuel algorithm shows almost same fuel economy and battery SOC compared to those of the power assist algorithm.