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송한림(Hanlim Song),김정철(Jungchul Kim),김현수(Hyunsoo Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
An electronic-hydraulic controlled line pressure system was suggested based on the mechanical controlled CVT base model. As a high level control strategy, a 3-D optimal line pressure map was obtained considering the driver's desire, driving conditions. Also, PID type low level controller was designed. Using the high level control strategy and the dynamic models of the base model CVT with electronic controlled line pressure system, performance simulations were carried out. It is seen from the simulation results that fuel economy of the electronic controlled line pressure CVT vehicle improved by 5% for FTP-75 drive mode since the electronic control strategy keeps the line pressure low, which results in the improved efficiency of the hydraulic system.
금속 벨트 CVT 차량의 동적응답특성과 변속비 제어 전자화
송한림(Hanlim Song),김정철(Jungchul Kim),김현수(Hyunsoo Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this paper, an improved dynamic shifting model for the metal v-belt(MVB) CVT was suggested. Based on the existing formula, the improved equation was derived by adding the effect of the torque transmitted and the rotational speed. Also, the dynamic models for the hydraulic control valves and the CVT vehicle were obtained. Using the dynamic equations obtained, simulation was performed to investigate the CVT vehicle performance. The variograms from the simulations were in good accordance with the test results. In addition, electronic control of the shift ratio was adopted using the existing mechanical controlled MVB CVT. Simulation results for the CVT vehicle with shift ratio electronic control showed that acceleration performance was improved by 8% and the fuel economy was improved by 18% for FTP-75 mode compared with those of the mechanical controlled CVT.
송한림(Hanlim Song),김현수(Hyunsoo Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this paper, bondgraph models were obtained for a hydro mechanical CVT including belt-pulley shift dynamics. Shift dynamics for the metal belt CVT was derived based on belt-pulley transmission mechanism and viscous oil shear stress model. Simulations were performed to investigate the influence of some design parameters on the system characteristics. It is considered that dynamic models and simulation results can be used as useful materials for the design of electronic-controlled CVT.<br/> <br/>
라인압력 전자제어화 CVT 성능해석(Ⅱ)- 실험적 연구
송한림(Hanlim Song),김정철(Jungchul Kim),김현수(Hyunsoo Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
A CVT with a line pressure electronic control system was developed using PWM solenoid valves based on the mechanical controlled CVT in order to improve the overall efficiency of the CVT hydraulic system. For the line pressure electronic controlled CVT, the optimal line pressure control strategy was suggested considering the driver's desire and driving conditions. Experimental results showed that the line pressure of the electronic controlled line pressure CVT developed in this study can be reduced by 5-18 bar compared with those of the mechanical CVT for the launching test, and by 5-10 bar in the cruising test. Also, it is observed that the hydraulic power loss was decreased by<br/> the electronic control, which results in the increased efficiency by 2.5% at 60 KPH cruising speed. It is expected that the reduced amount of the line pressure by electronic control strategy contributes to the improvement in the CVT system efficiency.
송찬혁(Chanhyuk Song),송한림(Hanlim Song),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In this paper, CVT oil flow characteristics arc investigated. In order to calculate the oil flow, dynamic models of the ratio control valve, line pressure control valve are obtained by considering the CVT shift dynamics. In addition, CVT vehicle powertrain models are derived. Based on the dynamic models, a CVT flow simulator is developed. It is found from the simulation results that oil pump capacity needs to be determined by the oil flow required for the panic braking and an insufficient flow prevents the CVT from full range downshift, which results in poor re-start performance. In addition, a tandum type oil pump arrangement is proposed to reduce the hydraulic loss as well as to cover the oil flow in the panic braking.<br/> <br/> <br/>
[동력전달계부문] 역방향 토크 시 CVT 동력전달특성해석
이희라(Heera Lee),송한림(Hanlim Song),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, the power transmitting mechanism for negative torque of the meta] V-belt (MVB) CVT were investigated by theoretically analyzing variation of band tension, block compression forces for each of the primary and secondary pulleys. An experimental study was performed to investigate the speed ratio - thrust characteristics for negative torque. The experimental results are in good accordance witl1 tl1e theoretical results. The results of this study can be used as basic design materials for developing the CVT control system for negative torque
김주형(Joohyung Kim),송한림(Hanlim Song),성덕환(Dukhwan Sung),임채홍(Chaehong Lim),김정준(Jungjune Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In this paper, a shift feeling simulator for manual transmission is developed with driver model. The shift feeling simulator consists of dynamic models of the linkage system, single, double and triple cone synchronizer, drivetrain and driver model. In order to describe the synchronizing motion, contact and impact models are introduced for the sleeve, outer ring, cone and gear. Synchronizing motion is modeled as II steps depending on the relative displacement of the sleeve to the other components. In addition, a driver model is developed, which is able to realize the driver's shift motion to react the shift force acting on the shift lever. Shift simulations are carried out using the shift feeling simulator developed with MATLAB SIMULINK. From the shift feeling simulation, shift force, sleeve force, cone torque, index torque, input and output shaft speed can be calculated. It is found that simulation results are good agreement with the test results and it is expected that the shift feeling simulator developed in this study can be used to design manual transmission in concept design stage.
김주형(Joohyung Kim),성덕환(Dukhwan Sung),송한림(Hanlim Song),임채홍(Chaehong Lim),김정준(Jungjune Kim),석창성(Changsung Seok),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
Shift force simulator for a manual transmission is developed to estimate the shift force that is transmitted to the drivers hand. In order to develop the simulator, dynamic models of the external linkage, internal linkage, synchronizer and drivetrain are obtained. The synchronizing motion is modelled as eleven steps depending on the relative displacement of the sleeve to the ring spring, outer ring chamfer, and gear chamfer. The contact mechanism between the chamfer to chamfer is modelled as a linear spring. Based on the dynamic model of each element, a shift force simulator is developed. The simulator calculates the sleeve displacement, cone torque, poppet ball torque, sleeve force, shift force and the speed of the input and output shaft. It is found that the shift force by the simulator shows a good correlation with the test results and it is expected that the shift force simulator developed in this study can be used as a useful design tool to evaluate the shift feeling in the initial design stage.