| 摘要 |
A power-assist bicycle using a sensor having multiple magnet blocks evenly distributed in a housing, related to electric power-assisted bicycles that provide a power-assist signal with multipoint magnetic induction. The sensor comprises, sequentially connected, a sensing element, a power-assist model processor (21), a digital-to-analog converter (27), and an operational amplifier (28). The sensing element comprises a rotating disk (1) and a fixed disk (40) fitted with each other, and permanent magnet blocks (2) and a Hall element (3) arranged in a cavity of the rotating disk (1) and of the fixed disk (40). Arranged on the rotating disk (1) are the multiple permanent magnet blocks (2) that are opposite in adjacent magnetic polarities. The Hall element (3) on the fixed disk (40) is arranged at a position in proximity to the permanent magnet blocks (2). The sensor is sleeved on the exterior of a central shaft (51) of the bicycle. The operational amplifier (28) is connected to a motor controller (29). The relative positions of the permanent magnet blocks (2) and of the Hall element (3) are fixed, the Hall element (3) is allowed to acquire a rectangular wave signal, thereby facilitating the sensor to output via digital processing an adjustable and artificial setting-added power-assist model, thus allowing for optimal matching between human and machine and for electricity conservation. |
