| 摘要 |
A power assistance control device and control method for a power-assisted bicycle, and an automatic speed change method therefor. The power assistance control device comprises a fixed disk (13), a rotary disk (11) and a control unit, the fixed disk comprising a sensor, used for producing a pulse sequence, the rotary disk (11) comprising a grid ring, the grid ring rotating around the rotary disk (11) so that the sensor on the fixed disk (13) produces the pulse sequence, the control unit being used for controlling the bicycle speed according to a power assistance value corresponding to the pulse sequence. The power assistance control device is essentially not affected by environmental factors, thereby enabling the power assistance accuracy of the present invention to be high and the costs to be low. The power assistance control device is mounted at the positions of the rotary disk (11) and the fixed disk (13), and has an aesthetic appearance and a relatively small size. |
