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김필구(Pilgu Kim),류완식(Wansik Ryu),김현석(Hyunsuk Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In this paper, pressure characteristics for an independent pressure control type CVT are investigated, and (j solution to reduce the pressure fluctuation at steady state is proposed. From the experiments, a pressure fluctuation is observed at some secondary pressure range. In order to analyze the pressure characteristics, dynamic models of the hydraulic control system including the CVT variator are obtained. Using the dynamic models, the parameters that affect the pressure fluctuation are investigated. From the simulations, it is found that the change of the hydraulic stiffness is the main reason for the pressure fluctuation. Modification of the notch area of the SCV supply p0l1 is proposed to decrease the hydraulic stiffness gradient of the supply line from the SCV to the CVT variator. From the simulation and the experiment, it is found that the pressure fluctuation can be reduced effectively by the hydraulic stiffness control.
전동식 부스터 브레이크를 이용한 병렬형 HEV의 회생제동 협조제어 알고리즘 개발
김정욱(Jungwook Kim),고성연(Sungyeon Ko),이가온(Gaeun Lee),여훈(Hoon Yeo),김필구(Pilgu Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, a co-operative regenerative braking control algorithm for the HEV with an electric booster brake was proposed and its performance was evaluated. A dynamic model for the electric booster performance simulator and its performance was investigated. In addition, a dynamic model for the 6-speed AT based hybird vehicle was established to develop a performance simulator, and it was combined with the electric booster brake performance simulator. Considering the electric booster brake structure, a strategy was proposed to distribute the braking force and regenerative braking force using the electric booster brake. A co-operative regenerative braking control algorithm was proposed, wherein the regenerative torque is cut off to ensure ride comfort and maintain the braking force during downshift for braking, and then regenerative torque is controlled considering the electric booster brake response characteristic. The combined performance simulator was used to evaluate the performance of the electric booster brake and the co-operative control algorithm, and the results indicated that the desired braking force was maintained and that the deceleration change decreased.
류완식(Wansik Ryu),김필구(Pilgu Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.3
In this paper, the belt-pulley mechanical loss is investigated. A bondgraph model for the mechanical loss is developed from the viewpoint of the power flow by assuming that all power losses are attributed to the torque loss. The mechanical loss model consists of transient and steady state part. The coefficients of the power loss model are obtained from the experiments. It is found from the simulations and experiments that the steady state loss depends on the line pressure, input torque and rotational speed while the transient loss depends on the rotational speed, shift speed and the inertial torque.
최승렬(Seungryul Choi),김필구(Pilgu Kim),최경록(Kyungrok Choi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently, electromechanical power steering systems have begun to displace hydraulic power assistance, particularly in small and light passenger cars. However, rattle phenomenon have become chronic in MDPS (Motor Driven Power Steering) system and will likely worsen as steering assist power increases. This paper discusses an actual case study of the resolution of rattle vibration in the column assist type MDPS. In this study, ADAMS model of the MDPS system was built and correlated with test results. The model has been validated through the correlation in the low & mid frequency range and a listing of generic guidelines to address MDPS rattles is also suggested. In summary these are the application of the skew angle in the oval ring and anti-rattle spring attachments to dampen vertical impact due to the pressure angle and the helix angle of worm gear set when the direction of the worm gear rotation is reversed. This approach using MBD software (ADAMS) will help us to design the better anti-rattle mechanism components in MDPS system and solve the similar contact problems like a rattle vibration.