CN104002916B - Double magnetic ring rear pedal assist interruption system for electric assist bicycle - Google Patents

Abstract

The present invention is a double-magnetic ring rear pedaling assistance interruption system for an electric power-assisted bicycle, comprising: a microcomputer having a relative rotation comparison table; a motor; a large toothed disc fixedly arranged on a sleeve, the sleeve being unidirectionally rotatably connected to the motor; a crankshaft rotatably passed through the sleeve; a drive ring sleeved and fixed on the crankshaft, a delay mechanism being arranged between the drive ring and the sleeve; two magnetic units; and two magnetic sensors; wherein, when the drive ring is reversed relative to the sleeve, and the relative reversal angle is greater than or equal to a second angle, the microcomputer controls the motor to be reversed at a first speed, thereby interrupting the assistance; wherein, the second angle is smaller than the first angle.

Description

Double magnetic ring rear pedal assist interruption system for electric assist bicycle

technical field

The invention relates to electric power-assisted bicycles, in particular to an electric power-assisted bicycle double-magnetic-ring back-pedal power-assist interruption system.

Background technique

Existing electric power-assisted bicycles have the design of a rear pedal brake, for example, PCT Patent No. WO2012035682A, which discloses a rear pedal-type power-assisted motor control device. It uses anti-pedaling to brake; this case also cooperates with a control device to control the motor to generate regenerative braking, motor braking or motor stop when the anti-pedal brake is applied. Therefore, it discloses foot braking and motor braking. Technology.

Figure 6A and Figure 6B in the aforementioned case show a buffer device arranged between the crankshaft and the chainring, which is composed of the elements of figure numbers 51 and 52, which can provide a buffer space 51c when stepping back, and allow The control device can cut off the power of the motor in time, so as to prevent the user from being pushed back by the thrust of the motor and causing discomfort when the user depresses the brake.

PCT Patent No. WO 2012/125165A1 and European Patent No. EP 2380806A also disclose similar buffer mechanisms.

The above-mentioned prior art at most only discloses technologies such as controlling motor power-off, braking, or braking power generation, and does not have the technology of controlling the reverse rotation of the motor when stepping back.

In addition, if the pedaling speed of an electric-assisted bicycle is slower than the pedaling speed corresponding to the vehicle speed, the rotation speed of the chainring will be greater than the rotation speed of the crankshaft, which will consume the buffer space of the buffer mechanism and continue to drive The chainring continues to rotate forward together with the pedal, forming an improper driving condition. This may cause discomfort to the user, and even result in accidents such as muscle strain or pedaling instability resulting in the electric assist bicycle falling off. At this time, even if the user depresses the pedals, there is no buffer space, so the motor still has no time to cut off the power and still drives the chainring and the pedals to continue forward rotation, and there is still the possibility of accidents.

Contents of the invention

Known electric assist bicycles have not disclosed the technology of controlling the reverse rotation of the motor when stepping back in the handling of the brakes on the back, and there is also the problem of slow pedaling but the motor is still driving normally, which may cause accidents. Therefore, a technology capable of solving the aforementioned problems has been developed.

The present invention provides a double-magnetic-ring back-pedal power-assist interruption system for an electric-assist bicycle, which includes: a microcomputer with a relative rotation comparison table; a motor electrically connected to the microcomputer through a motor driver, so that the The microcomputer controls the motor through the motor driver; a large toothed plate is fixed on a sleeve, and the sleeve can be connected to the motor in one-way rotation, and can be driven by the motor when it rotates forward, and the motor reverses When rotating, it idles relative to the sleeve; a crank shaft is rotatably passed through the sleeve; a drive ring is sleeved and fixed on the crank shaft, and there is a delay mechanism between the drive ring and the sleeve; When the crankshaft rotates forward, the drive ring drives the sleeve with the forward rotation of the crankshaft to make the large toothed plate rotate forward synchronously; mechanism to make the crankshaft reverse a first angle relative to the sleeve, and then drive the sleeve and the large chainring to reverse; two magnetic units, each of which has a magnet fixing seat and is located on the magnet A magnetic ring on the fixing base, the two magnet fixing bases are respectively fixed on the sleeve and the driving ring, and rotate with the sleeve and the driving ring respectively; and two magnetic sensors are electrically connected to the microcomputer and correspond to For the two magnetic rings, the microcomputer judges whether the two magnetic rings have relative rotation through the signals sensed by the two magnetic sensors, and then judges whether the sleeve and the drive ring have relative rotation; Turn the comparison table to compare the relative rotation relationship between the sleeve and the drive ring; when the relative rotation relationship shows that the drive ring is stationary relative to the sleeve, the microcomputer drives the motor according to the normal riding state; When the relative rotation switch shows that the drive ring is reversed relative to the sleeve, and the relative reversed angle is greater than or equal to a second angle, the microcomputer controls the motor to reverse at a first rotational speed, and then interrupts the power assist; Wherein, the second angle is smaller than the first angle.

The invention can control the reverse rotation of the motor when pedaling backward, and can control the deceleration or reverse rotation of the motor when pedaling at a slow speed, thereby preventing improper driving and avoiding accidents that may occur due to improper driving.

Description of drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

FIG. 2 is a circuit block diagram of a preferred embodiment of the present invention.

Fig. 3 is a partial perspective view of a preferred embodiment of the present invention; showing the assembled state of the magnetic unit, the magnetic sensor, the crankshaft and the drive ring.

Fig. 4 is similar to Fig. 3, showing another combined state from another viewing angle.

FIG. 5 is an exploded view of FIG. 3 .

Fig. 6 is a schematic cross-sectional view of a preferred embodiment of the present invention, mainly showing the connection state between the motor and the one-way device.

7 is a schematic cross-sectional view of a preferred embodiment of the present invention, showing the delay mechanism between the drive ring and the sleeve, and showing the relationship among the first angle, the second angle and the third angle.

Fig. 8 is a schematic diagram of the action of a preferred embodiment of the present invention, showing the state where the drive ring drives the sleeve to rotate forward.

Fig. 9 is another schematic diagram of the action of a preferred embodiment of the present invention, showing the relative rotation of the drive ring and the sleeve.

Fig. 10 is another schematic diagram of the action of a preferred embodiment of the present invention, showing the state in which the drive ring drives the sleeve to reverse.

【Symbol Description】

10 Double magnetic ring rear pedal power interruption system of electric assist bicycle

11 microcomputer

12 Relative rotation comparison table

21 motor

22 motor driver

31 chainring

32 sleeve

34 one-way device

41 crankshaft

51 drive ring

52 delay mechanism

521 socket

522 inserts

61 magnetic unit

62 Magnet holder

64 magnetic ring

71 Magnetic sensor

θ1 first angle

θ2 second angle

θ3 third angle

detailed description

As shown in Fig. 1 to Fig. 6, according to a preferred embodiment of the present invention, a dual-magnet rear pedal assist interruption system 10 for an electric power-assisted bicycle is mainly composed of a microcomputer 11, a motor 21, and a large chainring 31. A crank shaft 41, a drive ring 51, two magnetic units 61 and two magnetic sensors 71, wherein:

The microcomputer 11 has a relative rotation comparison table 12 . Its contents are shown in Table 1 below.

Table 1

The motor 21 is electrically connected to the microcomputer 11 through a motor driver 22 , so that the microcomputer 11 controls the motor 21 through the motor driver 22 .

The large toothed plate 31 is fixed on a sleeve 32, and the sleeve 32 is connected to the motor 21 in a one-way rotation, and can be driven by the motor 21 when it is rotating forward. The sleeve 32 idles. In this embodiment, the sleeve 32 is connected to the motor 21 through a one-way device 34 to achieve a one-way rotation relationship. It is worth adding that if the motor 21 has a speed reduction mechanism, the one-way device 34 can be arranged between the motor 21 and the sleeve 32, or between the speed reduction mechanism and the sleeve 32. It is limited to be installed on the motor 21 .

The crankshaft 41 is rotatably passed through the sleeve 32 .

The drive ring 51 is sheathed and fixed on the crankshaft 41 , and a delay mechanism 52 is disposed between the drive ring 51 and the sleeve 32 . When the crankshaft 41 rotates forward, the drive ring 51 drives the sleeve 32 with the crankshaft 41 forwardly rotates to make the large chainring 31 rotate forwardly synchronously. When the crankshaft 41 rotates from forward to reverse, the drive ring 51 drives the sleeve 32 after the crankshaft 41 reverses a first angle θ1 relative to the sleeve 32 through the delay mechanism 52 Together with the large toothed disc 31 reverse. The first angle θ1 may be between 25 degrees and 90 degrees during implementation, and 30 degrees is taken as an example in this case.

In this embodiment, the delay mechanism 52 consists of at least one slot 521 on the inner ring surface of the sleeve 32 (two slots are used as an example in the figure) and at least one slot 521 on the outer ring surface of the drive ring 51. Inlays 522 (taking two inlays as an example among the figures) are formed, and the two inlays 522 are respectively positioned in the two inlay grooves 521, and the space of one of the inlays 521 is larger than that of one of the inlays 522, thus making a The slug 522 can move freely within the first angle θ1 in the slit 521 without contacting the wall of the slit 521 , and the movable space of the slug 522 is like the buffer space in the prior art.

Each of the magnetic units 61 has a magnet holder 62 and a magnetic ring 64 located on the magnet holder 62. The two magnet holders 62 are respectively fixed on the sleeve 32 and the crankshaft 41, and respectively follow the sleeve. The cylinder 32 and the crankshaft 41 rotate. In this embodiment, the magnet fixing base 62 and the sleeve 32 are integrally formed, which means that the magnet fixing base 62 can be integrally formed with the sleeve, or can be combined with different components.

The two magnetic sensors 71 are Hall elements, electrically connected to the microcomputer 11 and respectively corresponding to the two magnetic rings 64, and the microcomputer 11 judges whether the two magnetic rings 64 are There is relative rotation, because the drive ring 51 rotates with the crankshaft 41 , so it can be judged whether the sleeve 32 and the drive ring 51 have relative rotation through the above sensing relationship.

Wherein, the microcomputer 11 compares the relative rotation relationship between the sleeve 32 and the driving ring 51 through the relative rotation comparison table 12 . When the relative rotation relationship shows that the drive ring 51 is stationary relative to the sleeve 32, the microcomputer 11 drives the motor 21 according to the normal riding state; When the cylinder 32 is reversed, and the relative reversed angle is greater than or equal to a second angle θ2, the microcomputer 11 controls the motor 21 to reverse at a first rotational speed, and then the power assist is interrupted. Wherein, the second angle θ2 is smaller than the first angle θ1. In this embodiment, the first rotational speed is greater than the actual reverse speed of the driving ring 51, for example 80 rpm reverse (80 rpm must be greater than the normal kickback speed), or for example the actual reverse speed plus 10 rpm. The actual reverse speed refers to the rotational speed of the drive ring 51 relative to the body (not shown in the figure) of the electric assist bicycle.

In addition, in this embodiment, before the relative rotation relationship shows that the driving ring 51 is reversed relative to the sleeve 32, and the relative reversed angle is greater than or equal to the second angle θ2, a third third angle can also be added. The condition of the angle θ3, that is, when the relative reverse angle is greater than or equal to a third angle θ3, the microcomputer 11 controls the motor 21 in the forward rotation to decelerate, and then interrupts the power assist, and the relative reverse angle is greater than Or when it is equal to the second angle θ2, the motor 21 is controlled to reverse. Wherein the third angle θ3 is smaller than the second angle θ2; the second angle θ2 is located in the interval of the second angle θ2, and overlaps the first angle θ1; the third angle θ3 is located in the interval of the second angle θ2 , while overlapping the second angle θ2. For example, in Figure 7, the starting point of the first angle θ1 is A and the ending point is B; the starting point of the second angle θ2 is also A but the ending point is C; the starting point of the third angle θ3 is also A but ends The point is D. The second angle θ2 is between 10 degrees and 20 degrees, and 16 degrees is taken as an example; the third angle θ3 is between 5 degrees and 10 degrees, and 8 degrees is taken as an example.

As far as detection is concerned, the magnetic sensor is mainly used to sense the number of magnetic poles on the magnetic ring and the angle between each magnetic pole, and then the angle of rotation can be calculated. Therefore, the number of magnetic poles on a magnetic ring determines the resolution of the sensing angle. In this case, using a magnetic ring with more than 44 magnetic poles, 44 positive triggers and 44 negative triggers can be detected, and there are 88 triggers in total. In terms of a 360-degree circle, the angle represented by each trigger is 4.09 degrees. Therefore, it can just correspond to the aforementioned situations where the second angle θ2 is 16 degrees as an example and the third angle θ3 is 8 degrees as an example.

The structure of the present invention has been described above, and the operation state of the present invention will be described next.

Please refer to FIG. 8 , in the process of riding, if the user is stepping on normally, that is, when stepping forward, since the insert 522 of the drive ring 51 is against the groove wall of the socket 521 of the sleeve 32, that is, Drive this large gear plate 31 (shown in Fig. 1) forward rotation, this moment this moment this driving ring 51 and this sleeve 32 promptly are in the co-moving state and have no relative rotation relation, this microcomputer 11 (shown in Fig. 2) promptly follows normal riding Drive the motor 21 (shown in FIG. 6 ) in a multiplied state.

As shown in Figure 9, when the user pedals at a speed slower than the speed corresponding to the vehicle speed, the rotation speed of the large chainring 31 will be greater than the rotation speed of the crankshaft 41, so the drive ring 51 will produce a rotation speed relative to the sleeve. 32 reverse relative rotation relationship, the two magnetic rings 64 will produce misalignment. And when the reverse angle is greater than or equal to the third angle θ3 and less than the second angle θ2, the motor 21 is controlled to decelerate, and then the rotation speed of the sleeve 32 is slowed down. At this time, the rotation speed of the motor 21 should be reduced to The driving speed should correspond to the user's actual pedaling speed; thus, the increasing speed of the reverse angle can be slowed down, that is, the consumption speed of the buffer space of the insert 522 in the slot 521 can be slowed down. And when the reverse angle is greater than or equal to the second angle θ2, the motor 21 is controlled to reverse at the first rotational speed, and the motor 21 cannot drive the sleeve 32 to rotate forward. Thus, it can be ensured that the motor 21 will not be driven improperly when pedaling at a slow speed, thereby avoiding the possibility of accidents.

Also as shown in FIG. 10 , during normal pedaling, when the user wants to brake and then pedals, the drive ring 51 reverses quickly relative to the sleeve 32 . As above, when the relative reverse angle is greater than the third angle θ3, the motor 21 is controlled to decelerate; and when the relative reverse angle is greater than the second angle θ2, the motor 21 is controlled to reverse. In this way, it can still be ensured that the motor 21 will not drive the sleeve 32 improperly, avoiding the possibility of accidents.

It is worth mentioning that the design of the third angle θ3 is mainly to allow the motor 21 to decelerate first before reversing, so as to control the reversing of the motor 21 more quickly. However, it is also feasible to design only the second angle θ2 without designing the third angle θ3. In this case, as long as the relative reverse angle is greater than the second angle θ2, the forward-rotating motor 21 is directly controlled to reverse, which can still achieve the effect of preventing improper driving in this case, thereby avoiding the possibility of accidents.

Claims (9)

1. step on power-assisted after double magnet rings of an electric booster bicycle and interrupt system, it is characterised in that include:

One micro computer, has one and relatively rotates synopsis；

One motor, is electrically connected at this micro computer by a motor driver, and thus this micro computer is the most logical Cross this motor driver to control this motor；

One large fluted disc, is fixedly arranged on a sleeve, is connected to this motor to this sleeve energy one-directional rotation, can be subject to The driving when rotating forward of this motor, dallies relative to this sleeve during the reversion of this motor；

One crank axle, can be arranged in this sleeve rotationally；

One drives ring, sheathed is fixed on this crank axle, has a delay between this driving ring and this sleeve Mechanism；When this crank axle rotates forward, this driving ring drives with the rotating forward of this crank axle that this sleeve is related to be made This large fluted disc synchronizes to rotate forward；When changing reversion into during this crank axle rotates forward, this driving ring is prolonged by this After mechanism makes this crank axle relative to this sleeve reversion one first angle late, just drive this sleeve even Invert with this large fluted disc；

Two magnet units, respectively this magnet unit has a Magnet and fixes seat and be located at this Magnet and fix seat On a magnet ring, this two Magnet fixes seat and is individually fixed in this sleeve and this driving ring, and respectively with This sleeve and this driving ring rotate；And

Two magnetic sensors, are electrically connected at this micro computer and correspond respectively to this two magnet ring, this micro-electricity Nicergoline crosses signal that this two magnetic sensor sensed to judge whether this two magnet ring relatively rotates, And then judge whether this sleeve and this driving ring relatively rotate；

Wherein, this micro computer relatively rotates synopsis by this and compares the phase of this sleeve and this driving ring To rotation relation；This relatively rotate relation present this driving ring motionless relative to this sleeve time, should Micro computer drives this motor according to normal riding configuration；Relatively rotate relation present this driving ring at this Invert relative to this sleeve, and when the angle of reversion relatively is more than or equal to second angle, this micro-electricity Brain i.e. controls this motor and carries out inverting in one first rotating speed, and then interrupts power-assisted；Wherein, this second jiao Degree is less than this first angle.

2., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 1, it is special Levy and be: outside at least one caulking groove that this delay device is had by this sleeve inner ring surface and this driving ring At least one abaculus that anchor ring is had is formed, and this at least one abaculus is positioned at this at least one caulking groove, and The space of this at least one caulking groove is more than this at least one abaculus, thus makes this at least one abaculus can in this at least In one caulking groove the most movable and do not contact this caulking groove cell wall in this first angle.

3., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 2, it is special Levy and be: this first angle is between 25 degree to 90 degree.

4., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 1, it is special Levy and be: this first rotating speed is more than the actual speed reversal of this driving ring, and this actual speed reversal is Refer to this driving ring rotating speed relative to this electric booster bicycle car body.

5., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 1, it is special Levy and be: relatively rotate relation and present this driving ring at this and invert relative to this sleeve, and the most anti- When the angle turned is more than or equal to a third angle, this motor that this micro computer i.e. controls in rotating forward enters Row slows down, and then interrupts power-assisted；This third angle is less than this second angle.

6., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 5, it is special Levy and be: this second angle is positioned at the interval of this first angle, and with the part of this first angle Produce overlap.

7., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 6, it is special Levy and be: this third angle is positioned at the interval of this second angle, and with the part of this second angle Produce overlap.

8., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 5, it is special Levy and be: this second angle is between 10 degree to 20 degree；This third angle is between 5 degree to 10 Between degree.

9., according to stepping on power-assisted interruption system after double magnet rings of the electric booster bicycle of claim 1, it is special Levy and be: this sleeve is connected to this motor by an isolator.