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Control System Design of Power Assisted Bike Based on Planetary Gear

A planetary gear based transmission system for the power assisted bike (PAB) is proposed in this study because of its appealing 2-input/1-output transmission feature. Considering the practical requirements for power assistance, the electronically controlled continuously variable transmission (ECVT) and the torque assistance modes were realized for the PAB system. Unlike the conventional approaches which only provides either torque assistance or automated gear-shifting function, the planetary gear based transmission enables the PAB to provide a suitable power assistance mode in accordance with different riding conditions. The feasibility and effectiveness of this study is verified by experiment.