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[동력전단계부문] CVT 변속동역학을 고려한 라인 압력 및 변속비 제어 밸브의 응답 특성 해석
정근수(K.S.Jung),김달철(T.C.Kim),이희라(H.R.Lee),김현수(H.S.Kim),이재신(J.S.Lee),조희복(H.B.Cho) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dynamic models of line regulator valve(LRV) and ratio control valve(RCV) are obtained for an electronic controlled CVT. LRV and RCV are operated by variable force solenoid (VFSL Considering the CVT shift dynamics. oil pump's efficiency and saturation characteristics of VFS. simulations are performed and compared with test results. Simulation results are in good agreement with the experiments ‘ which shows the validity of the dynamic models of LRV and RCV obtained. In addition. the effects of the orifice size in the exhaust port of RCV are investigated. Simulation results show that as the orifice size decreases. the residual pressure in the primary actuator increases which insures the large torque transmission capacity. meanwhile the duration time for the downshift increases.