Transfer Function Derivation and LQG/LTR Speed Ratio Control for a Metal Belt CVT

금속벨트 CVT의 전달함수 도출과 변속비 LQG/LTR 제어

  • 김종준 (성균관대학교 대학원) ;
  • 송한림 (성균관대학교 대학원) ;
  • 김현수 (정회원, 성균관대학교 기계과)
  • Published : 1997.01.01


In this paper, a transfer function was obtained for a PWM high speed solenoid valve controlled metal 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. The phase difference and relatively slow response are considered due to the inaccuracy os the transfer functions, which resulted from the inherent nonlinearities of the transmission characteristics of the metal belt CVT.


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