Torque control of power-assisted bike via planetary gear mechanism

This paper presents an electronically controlled continuously variable transmission (E-CVT) function for a power-assisted system designed for use in a bike and implemented by a single planetary gear and an electric motor. The kinematic analysis of the planetary gear is investigated based on the block diagram representation. Moreover, the design of feedforward controlled speed ratio of the power-assisted bike is coordinated with pedaling speed. The performance of the E-CVT power-assisted system is evaluated experimentally in this study.