Title: Bond graph dynamics of a rubber-belt continuously variable transmission

Authors: Y.H. Hung, C.W. Hong

Addresses: Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan. ' Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan

Abstract: This paper analyses the system dynamics of a rubber-belt continuously variable transmission (CVT), which is widely adopted in the modern scooter powertrain systems. Dynamic mathematical models were derived from the physical configuration of the CVT directly via a bond graph approach. The CVT mainly consists of a varying-diameter driving pulley and another flange-moveable driven pulley, interconnected by a V-shaped rubber belt. Effective belt diameters of both driving and driven pulleys are controlled by a speed governor and a torque regulator, respectively. Each component was functionally analysed, employing the field theory in the bond graph technique. Mathematical equations were derived and then solved on a Matlab platform. Both static and dynamic performance simulations were examined for future electronic control implementation.

Keywords: continuously variable transmission; rubber belt CVT; bond graph approach; system dynamics; scooter powertrain; simulation; electronic control.

DOI: 10.1504/IJVD.2004.005246

International Journal of Vehicle Design, 2004 Vol.35 No.4, pp.383 - 398

Published online: 15 Sep 2004 *

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