| 主权项 |
1. A power-assistance bicycle, using a sensor having multiple magnet blocks evenly distributed in a housing of the power-assistance bicycle, comprising: an electric bicycle and a sensor;
wherein said electric bicycle has a medial shaft (51), a casing (52) is sleeved on a middle section of said medial shaft (51), said medial shaft (51) is rotationally connected with said casing (52); a chain wheel (53) is fixed on said medial shaft (51), and two pedals (54) are respectively fixed on two ends of said medial shaft (51); a battery (55) is connected with a motor controller (29), and said motor controller (29) is connected with a motor (30) on a wheel of said power-assistance bicycle; wherein said sensor comprises a sensing element, a power assistance model processor (21), a digital-to-analog converter (27) and an operational amplifier (28) connected in sequence, wherein said sensing element is adapted for transforming rotational motions of an annular-groove rotating disk (1) to rectangular wave output signals; wherein said sensing element comprises said annular-groove rotating disk (1), an annular-groove fixing disk (40), a Hall element (3) and a plurality of permanent magnetic blocks (2) which have identical sizes, identical shapes and identical magnetic flux; a concave of said annular-groove rotating disk (1) is opposite to a concave of said annular-groove fixing disk (40), and said annular-groove fixing disk 40 is inserted into an annular groove of said annular-groove rotating disk (1) to form a fitting interior-empty housing in which two disks are capable of relatively rotating with each other, said concave of said annular-groove rotating disk (1) and said concave of said annular-groove fixing disk (40) form a hollow ring (41); said plurality of permanent magnetic blocks (2) are fixedly arranged on a portion of said annular-groove rotating disk (1) within said hollow ring (41), and said plurality of permanent magnetic blocks (2) are distributed along a circular trajectory, wherein: distances of all permanent magnetic blocks (2) to a center of said circular trajectory (5) are identical; lengths of two adjacent permanent magnetic block intervals are identical; pole N and pole S of each permanent magnetic block (2) are respectively provided on two surfaces of said annular-groove rotating disk (1), magnetic polarities of every two adjacent permanent magnetic blocks (2) are opposite, said magnetic polarities of said adjacent permanent magnetic blocks (2) on said annular-groove rotating disk (1) are distributed in a pattern of pole N, pole S, pole N, pole S, pole N, pole S; said Hall element (3) is fixedly located on a portion of said annular-groove fixing disk (40) within said hollow ring (41), and is located at a position which is close to said permanent magnetic blocks (2) and capable of inducting said magnetic flux of each of said permanent magnetic blocks (2), a distance is provided between said Hall element (3) and said permanent magnetic blocks (2); said Hall element (3) is adapted for generating said rectangular wave output signals under two opposite magnetic polarities; said power assistance model processor (21) is a signal form converter adapted for converting rotating digital signals of said annular-groove rotating disk (1) to power assistance model digital signals; wherein said power assistance model processor (21) comprises an analog-digital conversion and rate calculator (24), a power assistance model storage (25) and a power assistance model calculator (26); said analog-to-digital conversion and rate calculator (24) is connected with said Hall element (3), said analog-to-digital conversion and rate calculator (24) calculates rectangular wave signals inputted by said Hall element (3) to obtain rates of change for representing a rotating speed of said annular-groove rotating disk (1); said analog-to-digital conversion and rate calculator (24) is connected with said power assistance model calculator (26), and said power assistance model storage (25) is also connected with said power assistance model calculator (26); said power assistance model calculator (26) selects a certain power assistance model function of said power assistance model storage (25) via said rotation rate of said annular-groove rotating disk (1) of said analog-to-digital conversion and rate calculator (24) and said rotation rate of said annular-groove rotating disk (1) calculated by said analog-to-digital conversion and rate calculator (24) of said annular-groove rotating disk (1) is inputted into said power assistance model function to calculate a power assistance model digital signal, said power assistance model calculator (26) outputs said power assistance model digital signals; said digital-to-analog converter (27) is adapted for converting said power assistance model digital signals to power assistance model analog signals; wherein said power assistance model calculator (26) is connected with said digital-to-analog converter (27), and said digital-to-analog converter (27) converts said power assistance model digital signals of said power assistance model calculator (26) to said power assistance model analog signals; wherein said sensor comprises a mechanical part and a sensing part, said annular-groove rotating disk (1) and said annular-groove fixing disk (40) are respectively sleeved outside said medial shaft (51) of said electric bicycle, said annular-groove fixing disk (40) is fixedly mounted on said casing (52) of said medial shaft (51), said annular-groove rotating disk (1) of said sensor is mounted on said medial shaft (51) of said electric bicycle, said annular-groove rotating disk (1) rotates synchronously with said medial shaft (51), said annular-groove rotating disk (1) is sleeved outside said annular-groove fixing disk (40) to form an inserted rotation connection, said annular-groove rotating disk (1) and said medial shaft (51) have a common rotation center, and a signal output wire of said operational amplifier (28) is connected with a signal input end of said motor controller (29) of said electric bicycle. |
