| 摘要 |
The present invention relates to a power-assisted electric bicycle, which comprises a bicycle frame, a rear wheel, a driving unit, with the bicycle frame including a bottom bracket and a chain stay connected, the rear wheel being mounted on the chain stay via a rear shaft; the driving unit includes a central shaft, a pedal chain wheel, a pedal device, a freewheel and a chain; the central shaft is mounted in the bottom bracket, and the pedal chain wheel is mounted on the central shaft, with the pedal devices mounted at both ends of the central shaft, respectively; the freewheel is mounted on the rear shaft to drive the rear wheel to rotate; the chain transmits the driving force of the pedal chain wheel to the freewheel; the electric power-assisted device includes a torque sensing unit, an electric power-assisted unit and a control unit; the torque sensing unit is mounted in the bottom bracket, so as to sense the torque generated on the central shaft by the pedal device; the control unit, according to the information of torque sensed by the torque sensing unit, outputs a control signal to the electric power-assisted unit mounted on the chain stay, so as to output the corresponding driving force to the chain according to the control signal. |
