Title: Model based control for a pressure control type CVT

Authors: Wansik Ryu, Juhyun Nam, Yongjoon Lee, Hyunsoo Kim

Addresses: School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Suwon, 440-746, Korea. ' School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Suwon, 440-746, Korea. ' Hyundai Motor Company, 772-1 Jangduk-dong, Whasung-si, Gyunggi-do, 445-706, Korea. ' School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Suwon, 440-746, Korea

Abstract: A model based control algorithm for the pressure control type CVT has been developed. Firstly, a P-line is proposed from the steady state relationship between the primary and secondary pressure for the given speed ratio to predict the shift performance. It is found from the P-line that the bigger the pressure difference, the faster the shift speed. Based on the steady state characteristics of the pressure control type ratio control valve, the model based control algorithm is proposed. It is found from the experiments that the model based control is able to provide the improved tracking performance and robustness.

Keywords: CVT ratio control; model based control; pressure control; shift performance; tracking performance; ratio control valve; hydraulic control; dynamic modelling; metal belt CVT; continuously variable transmission; vehicle design.

DOI: 10.1504/IJVD.2005.008470

International Journal of Vehicle Design, 2005 Vol.39 No.3, pp.175 - 188

Published online: 21 Dec 2005 *

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