| 摘要 |
<p>A power-assisted bicycle(10)(60) includes a bicycle body (11) with a power assistance provider (12) and a derailleur (16), a microcomputer (21), a gear-shift control driver (31), and sensors (41). When the microcomputer (21) decides to perform gear shifting, it controls the power assistance provider (12) to provide an assistant power output and the gear-shift control driver (31) to drive the derailleur (16) to shift gears properly subject to a before-shifting time period, an in-shifting time period and an after-shifting time period. Further, the microcomputer (21) controls the power assistance provider (12) to change the current assistant power to a predetermined low assistant power during the before-shifting time period, or to maintain the predetermined low assistant power during the in-shifting time period, or to change the assistant power output to a level higher than the current assistant power and then to return to the said current assistant power after the end of the after-shifting time period.</p> |
