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송한림(H.L.Song),김정철(J.C.Kim),김현수(H.S.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this work. A simulation tool “CVTFLOW” is developed for calculation of the required flow rate of CVT hydraulic system. CVTFLOW is designed using the CVT geometry. Shift dynamics and vehicle dynamics. CVTFLOW consists of: (1) basic flow rate calculation module. (2) design flow rate calculation module and (3) flow rate calculation module for the given vehicle test data. It is found that the simulation results of CVTFLOW are in good agreement with the test resulte. It is expected that CVTFLOW can be used in design of the required flow rate of the CVT hydraulic system.<br/>
금속벨트 CVT의 전달함수 도출과 변속비 LQG/LTR 제어
김종준(J.J.Kim),송한림(H.L.Song),김현수(H.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
In this paper, a transfer function was obtained for a PWM solenoid controlled metal pushing belt CVT system. The transfer function was defined as the ratio of speed ratio to PWM duty ratio and derived in time domain by linear regression analysis from the experimental results. The transfer function obtained showed different dynamic characteristics for the up and down shift. Also, LQG/LTR controller was designed for the CVT system using the transfer function. It is seen from the experimental results that LQG/LTR control showed good performance for the speed ratio tracking and disturbance rejection.<br/>