| 摘要 |
<p>A gear-shifting system (10)(10') for a power-assisted bicycle (90) includes: a power supply module (11); a microcomputer (21)(21'); a gear-shifting driver (31); and a pedal position sensing module (41) for detecting an angular position of a crank (95) of the power-assisted bicycle (90). The microcomputer (21)(21') has a gear-shifting operation logic (22)(22') and is configured to execute the gear-shifting operation logic (22)(22') before performing a gear-shifting operation. Steps for executing the gear-shifting operation logic (22) include: (1) when the angular position of the crank (95) passes through a first angular position (P1), reducing the assisting power output by the motor (91) to a first power value; (2) when the angular position of the crank (95) leaves the first angular position (P1) and passes through a dead point (Pd), minimizing the assisting power output by the motor (91); (3) performing the gear-shifting operation; (4) when the gear-shifting operation is finished, returning the assisting power output by the motor (91) to a level of the assisting power before the step (1).</p> |
