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자동변속기용 리듀싱형 압력제어밸브의 설계인자에 대한 감도분석
정규홍(G. H. Jung),이교일(K. I. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Almost all automatic transmissions utilize the hydraulic power in changing gears and as the performance requirement of the automatic transmission has become more rigorous in recent years, there is trend toward the application of electrohydraulic control systems to improve shift quality during gear shift. In that TCU control algorithm should be developed based on the dynamic characteristics of pressure control system, it is important to ensure the good control performance and stability of the hydraulic systems. This paper deals with the sensitivity analysis for variations of design parameters relevant to pressure control system which consists of electrically operated solenoid valve and reducing type valve. From the sensitivity analysis result, sensitivity function and the difference in the lowest eigenvalue could be a measure of sensitivity of the system's response to a parameter variations. Computer simulations for nonlinear pressure control system are also performed to prove the validitY of the linear system analysis result.<br/> <br/>
정규홍(G. H. Jung),이교일(K. I. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
The shift quality of an automatic transmission which results from the rotational speed difference before and after the shift could occur during both the torque phase and the inertia phase. its magnitude is a function of engine driving torque, clutch or brake applying control torque and load torque. Hence, in order to achieve the good shift quality, it is necessary to utilize all the information that affects the shifting process. However, current shift control algorithm cannot take into account the effect of load<br/> torque since no information about it is available. In this paper, a real-time estimation algorithm for the grade and/or braking resistance of a driving car is proposed to improve the shift quality. From the computer simulation result, it was shown that the estimated load torque converged to its real value within acceptable time period and was not influenced by the initial condition difference.<br/> <br/>
INVECS-Ⅱ 자동 변속기의 동특성분석 및 토크영역에서의 개루프 변속제어기법
정규홍(G.H.Jung),조백현(B.H.Cho),이교일(K.I.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Nowadays. most automatic transmissions of passenger cars adopt an electronically controlled shifting mechanism to enhance the driveability and fuel economy. INVECS-II automatic transmission is developed by Mitsubishi Motor Company and equipped with electronic control system. Its major design features are that clutch-to-clutch shifting mechanism is employed for simplified construction and lighter weight and four independently operated PWM solenoid valves control the applying pressure on the friction elements during shift. In this paper. a dynamic model of INVECS-II automatic transmission is established to investigate the shifting characteristics and verify the validity of the proposed open-loop pressure control strategy in torque phase. The shifting response of simulation model shows good agreement with experimental result and static torque analysis results for torque phase are proved to be useful in terms of computer simlation.
비례제어 솔레노이드 밸브가 적용된 INVECS-Ⅱ 자동변속기의 관성영역 폐루프 변속제어기법
정규홍(G.H.Jung),조백현(B.H.Cho),허재웅(J.W.Huh),이교일(K.I.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
INVECS-Ⅱ AUTOMATIC TRANSMISSION IS RECENTLY DEVELOPED BY Mitsubishi Motor Company and equipped with full electronic control system. Its major design features are that clutch-to-clutch shifting mechanism for simplified construction and lighter weight and four independently operated PWM solenoid valves control the applying pressure on the friction elements during shift. However. Since flow control characteristic of the solenoid valve itself is not enough to meet the required pressure dynamics for shifting control. Second stage pressure control valve for each solenoid valve is designed in order to amplify the control flow. Besides. For each control element. There is a accumulator to ger rid of the ripple pressure due to the low carrier frequency of PWM driving circuit. Hence. In view of these aspects. Hydraulic control system have complicated design with many elements.<br/> In this paper. INVECS-Ⅱ automatic transmission was redesigned with proportional control soldenoid valves which control pressures are directly applied to control elements and modified transmission was tested on dynamometer to investigate its shifting characteristics. We adopted closed-loop control algorithm and designed a controller based on the linearized turbine dynamics model that is proposed in this paper.<br/>
조백현(B.H.Cho),정규홍(G.H.Jung),이교일(K.I.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In general. the electronically controlled pulse width modulation (PWM) solenoid valve as a hydraulic actuator in the automatic transmission has only small capacity because of the limited size and electric power consumption. So it is necessary to combine with a reducing type second stage valve. so called pressure control valve(PCV). to amplify the pressure and the flow rate. The behavior of the PCV which is driven by the PWM solenoid valve is quite different from the normal reducing type valve. In this paper. a theoretical model of the PCV considering flow forces is presented. and its steady state characteristics are analyzed to predict the dynamics. Also. we find that there are good matches between the dynamic simulation results and the experimantal data. Therefore. the model constructed in this article 'can be used to predict a macroscopic performance of the PCV.
조백현(B.H.Cho),정규홍(G.H.Jung),허재웅(J.W.Hur),이교일(K.I.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
As most of today’s automatic transmissions in passenger cars adopt a electro-hydraulic control system, the role of electronically controlled solenoid valves occupies an important position and it is essential to predict the transient characteristics of the solenoid valves in order to design and evaluate the performance of the hydraulic control system. However. In general. Both the magnetic and electrical parameters of the solenoid system are hardly known and it is not easy to model this section with moderate complexity. This paper presents a dynamic modeling technique of a proportional control solenoid valve(PCSV) for an automatic transmission in terms of system identification theory. We can find that this approach make a good result to represent the performance of PCSV.<br/>
임시형(S.H.Lim),정순배(S.B.Chung),이교일(G.I.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
For rigoruos analysis of lockup engaging system, the lockup clutch system model, which considered hydraulic components and lockup spring-damper clutch, was set up. The dynamic equation of lockup solenoid valve and hydraulic valve was established. The piecewise linear model of lockup spring damper was applied in the transient torque simulation. 20th-order state equations including nonlinear model of hydraulic valve were established. The simulation of lockup clutch system was carried out and compared with the experimental result on engaging the lockup clutch of automatic transmission.<br/>