TWI532642B - Electric bike bi-magnetic ring after the step on the power interruption system - Google Patents

Description

Electric power bicycle double magnetic ring after stepping power interruption system

The invention relates to an electric assist bicycle, in particular to a double magnetic ring rear stepping assist interruption system of an electric assist bicycle.

A conventional electric assist bicycle having a rear brake design, such as PCT Patent No. WO2012035682A, discloses a rear-step power assist motor control device. It uses the anti-stepping pedal to brake; the case is combined with a control device to control the motor to generate regenerative braking, motor braking or motor stopping when the pedal brake is reversed, thus exposing the foot brake and the motor brake Technology.

6A and 6B in the foregoing case show a buffer device provided between the crank shaft and the toothed disc, which is composed of the elements of the numbers 51 and 52, and can provide the buffer space 51c at the time of reverse stepping, and can be made The control device can make the motor power off, and avoid the user from being uncomfortable by pushing back the brake when the brake is reversed.

A similar cushioning mechanism is also disclosed in PCT Patent No. WO 2012/125165 A1 and European Patent No. 2,380,806, A.

The prior art described above only reveals techniques for controlling motor power-off, braking, or brake power generation, and does not have the technique of controlling motor reversal during reverse pedaling.

In addition, in the electric bicycle that is being stepped on, if the speed of stepping is slower than the speed corresponding to the speed of the vehicle, the speed of the toothed disc will be greater than the rotational speed of the crankshaft, and the buffer space of the buffer mechanism will be consumed, and then the driving will continue. The sprocket and the pedal continue to rotate forward, creating an improper drive condition. This may cause the user to be uncomfortable or even cause an accident in which the muscle is pulled or the pedal is unstable and the electric bicycle is dropped. At this time, even if the user reverses the pedal, since there is no buffer space, the motor still has no power to power off and still drives the chainring and the pedal to continue to rotate forward, and there is still the possibility of an accident.

Known electric assist bicycles have not disclosed the technique of controlling the motor reversal when stepping on the rear, but also have the problem of slow pedaling but the motor is still driven normally and may cause an accident. Therefore, techniques to solve the aforementioned problems have to be developed.

The double magnetic ring rear stepping assist interruption system of the electric assist bicycle includes: a microcomputer having a relative rotation reference table; and a motor electrically connected to the microcomputer by a motor driver, thereby The microcomputer controls the motor by the motor driver; the large toothed disc is fixed to a sleeve which is unidirectionally coupled to the motor and is driven by the motor during forward rotation, the motor When the reverse rotation is idling with respect to the sleeve; a crank shaft is rotatably disposed through the sleeve; a drive ring is sleeved and fixed to the crank shaft, and a delay mechanism is provided between the drive ring and the sleeve When the crankshaft rotates forward, the drive ring rotates with the forward rotation of the crankshaft to rotate the sleeve to rotate forward synchronously; when the crankshaft is reversed during forward rotation, the drive loop borrows The delay mechanism rotates the crank shaft by a first angle with respect to the sleeve to drive the sleeve together with the large toothed disc. Two magnetic units each have a magnet holder and a magnet holder. a magnetic field on the magnet holder The two magnet fixing bases are respectively fixed to the sleeve and the driving ring, and respectively rotate with the sleeve and the driving ring; and the two magnetic sensors are electrically connected to the microcomputer and respectively correspond to the two magnetic rings The microcomputer determines whether the two magnetic rings are relatively rotated by the signal sensed by the two magnetic sensor, thereby determining whether the sleeve and the driving ring have relative rotation; wherein the microcomputer is Relative rotation relationship table is used to compare the relative rotation relationship between the sleeve and the driving ring; when the relative rotation relationship shows that the driving ring is not moving relative to the sleeve, the microcomputer drives the motor according to a normal riding state; The relative rotation relationship is that the driving ring is reversed relative to the sleeve, and when the relative reverse angle is greater than or equal to a second angle, the microcomputer controls the motor to reverse to a first rotation speed, thereby interrupting the assisting force. Wherein the second angle is less than the first angle.

The invention can control the motor reversal when the vehicle is stepped on, and can control the horse during the slow pedaling Deceleration or reversal, thereby preventing improper driving conditions and avoiding accidents that may occur due to improper driving.

10‧‧‧Electric power bicycle double magnetic ring rear step assisted interruption system

11‧‧‧Microcomputer

12‧‧‧ Relative rotation table

21‧‧‧Motor

22‧‧‧Motor drive

31‧‧‧Spindle

32‧‧‧Sleeve

34‧‧‧One-way device

41‧‧‧ crankshaft

51‧‧‧ drive ring

52‧‧‧Delayed institutions

521‧‧‧Inlay

522‧‧‧Block

61‧‧‧Magnetic unit

62‧‧‧Magnetic mount

64‧‧‧ magnetic ring

71‧‧‧Magnetic sensor

θ 1‧‧‧ first angle

θ 2‧‧‧second angle

θ 3‧‧‧ third angle

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the present invention.

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

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

Figure 4 is similar to Figure 3, showing the combined state of another perspective.

Figure 5 is an exploded view of Figure 3.

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

Figure 7 is a 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 of the first angle, the second angle, and the third angle.

Figure 8 is a schematic view showing the operation of a preferred embodiment of the present invention, showing the state in which the drive ring drives the sleeve to rotate forward.

Figure 9 is a schematic view showing another operation of a preferred embodiment of the present invention, showing a state in which the drive ring and the sleeve are relatively rotated.

Fig. 10 is a schematic view showing still another operation of a preferred embodiment of the present invention, showing a state in which the driving ring drives the sleeve to be reversed.

As shown in FIG. 1 to FIG. 6 , a double magnetic ring rear stepping assist system 10 for an electric assist bicycle according to a preferred embodiment of the present invention is mainly composed of a microcomputer 11 , a motor 21 , and a large tooth. Disk 31, a crank shaft 41, a drive ring 51, two magnetic units 61 and two The magnetic sensor 71 is composed of: the microcomputer 11 has a relative rotation comparison table 12. The contents are shown in Table 1 below.

The motor 21 is electrically connected to the microcomputer 11 by a motor driver 22, whereby the microcomputer 11 controls the motor 21 by the motor driver 22.

The large toothed disc 31 is fixed to a sleeve 32. The sleeve 32 is unidirectionally coupled to the motor 21 and is driven by the motor 21 during forward rotation. The motor 21 is reversed relative to the motor 21 The sleeve 32 is idling. In the present embodiment, the sleeve 32 is coupled to the motor 21 by a one-way device 34 to achieve a one-way rotational relationship. It is to be noted that if the motor 21 has a speed reduction mechanism, the one-way device 34 can be disposed between the motor 21 and the sleeve 32, or between the speed reduction mechanism and the sleeve 32, and It is limited to be provided in the motor 21.

The crank shaft 41 is rotatably inserted through the sleeve 32.

The driving ring 51 is sleeved and fixed to the crank shaft 41. The driving ring 51 and the sleeve 32 have a delay mechanism 52. When the crankshaft 41 rotates forward, the drive ring 51 carries the sleeve 32 along with the forward rotation of the crankshaft 41 to rotate the large toothed disc 31 synchronously. When the crankshaft 41 is reversed during the forward rotation, the drive ring 51 rotates the crankshaft 41 by a first angle θ 1 with respect to the sleeve 32 by the delay mechanism 52. The barrel 32 is reversed along with the large chainring 31. The first angle θ 1 may be between 25 degrees and 90 degrees when implemented, and 30 degrees in the present case.

In the embodiment, the delay mechanism 52 is composed of at least one of the inner cavities 521 of the sleeve 32 (for example, two cavities in the figure) and at least the outer ring surface of the drive ring 51. A block 522 (in the figure, the two blocks are taken as an example), the two blocks 522 are respectively located in the two slots 521, and the space of the slot 521 is larger than the block 522. Therefore, the insert block 522 can freely move within the first angle θ 1 in the recess 521 without contacting the recess 521. The wall of the groove, and the space in which the block 522 can move, 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 disposed on the magnet holder 62. The two magnet holders 62 are respectively fixed to the sleeve 32 and the crank shaft 41, respectively. The barrel 32 and the crank shaft 41 rotate. In the present embodiment, a magnet holder 62 is integrally formed with the sleeve 32. This means that the magnet holder 62 can be integrally formed with the sleeve or can be combined with different components.

The two magnetic sensor 71 is a Hall element electrically connected to the microcomputer 11 and corresponding to the two magnetic rings 64 respectively. The microcomputer 11 is a signal sensed by the two magnetic sensor 71. It is determined whether the two magnetic rings 64 are relatively rotated. Since the driving ring 51 rotates with the crank shaft 41, it can be determined whether the sleeve 32 and the driving ring 51 are relatively rotated by the sensing relationship described above.

The microcomputer 11 compares the relative rotation relationship between the sleeve 32 and the driving ring 51 by the relative rotation comparison table 12. When the relative rotation relationship shows that the driving ring 51 is not moved relative to the sleeve 32, the microcomputer 11 drives the motor 21 according to a normal riding state; in the relative rotation relationship, the driving ring 51 is presented with respect to the sleeve. When the cylinder 32 is reversed and the relative reverse angle is greater than or equal to a second angle θ 2 , the microcomputer 11 controls the motor 21 to reverse the first rotation speed, thereby interrupting the assist. The second angle θ 2 is smaller than the first angle θ 1 . In the present embodiment, the first rotational speed is greater than the actual reversal speed of the drive ring 51, such as 80 rpm (80 rpm is necessarily greater than the normal post-step speed), or, for example, the actual reversal speed plus 10 rpm. The actual reverse speed refers to the rotational speed of the drive ring 51 relative to the electric assist bicycle body (not shown).

In addition, in this embodiment, in the relative rotational relationship, the driving ring 51 is reversed with respect to the sleeve 32, and the relative reverse angle is greater than or equal to the second angle θ 2 The condition of the three-angle θ 3, that is, when the relative inversion angle is greater than or equal to a third angle θ 3 , the microcomputer 11 controls the motor 21 in the forward rotation to decelerate, thereby interrupting the assist, and the relative reversal When the angle is greater than or equal to the second angle θ 2 , the motor 21 is again controlled to perform the reverse rotation. The third angle θ 3 is smaller than the second angle θ 2 ; the second angle θ 2 is located in the interval of the second angle θ 2 and overlaps the first angle θ 1 ; the third angle θ 3 is Located within the interval of the second angle θ 2 and overlapping the second angle θ 2 . For example, 7 In the figure, the starting point of the first angle θ 1 is A, and the ending point is B; and the starting point of the second angle θ 2 is also A but the ending point is C; the starting point of the third angle θ 3 is also A But the end point is D. The second angle θ 2 is between 10 degrees and 20 degrees, and is taken as an example of 16 degrees; the third angle θ 3 is between 5 degrees and 10 degrees, and 8 degrees is taken as an example.

In terms of detection, the magnetic sensor is used to sense the number of magnetic poles passing through the magnetic ring and the angle between each magnetic pole, so that 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 44 magnetic poles or more, 44 positive triggers and 44 negative triggers can be detected, and there are 88 triggers. In terms of 360 degrees of circumference, the angle represented by each trigger is 4.09 degrees. This is just the case where the second angle θ 2 described above is taken as an example and the third angle θ 3 is taken as an example of 8 degrees.

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

Referring to FIG. 8 , during the riding process, if the user steps on it normally, that is, when the user steps on, the insert 522 of the drive ring 51 is against the slot 521 of the sleeve 32. Therefore, the large toothed disc 31 (shown in FIG. 1) is rotated forward. At this time, the driving ring 51 and the sleeve 32 are in the same dynamic state without relative rotation relationship. The microcomputer 11 (shown in FIG. 2) That is, the motor 21 is driven in a normal riding state (shown in Fig. 6).

As shown in FIG. 9, when the user steps on the tread speed corresponding to the vehicle speed, the rotation speed of the large toothed disc 31 is greater than the rotation speed of the crankshaft 41, so the drive ring 51 is generated relative to the sleeve. The relative rotation relationship of the cylinder 32 is reversed, and the two magnetic rings 64 are misaligned. When the angle of the reversal is greater than or equal to the third angle θ 3 and less than the second angle θ 2 , the motor 21 is controlled to decelerate, thereby slowing down the rotation speed of the sleeve 32 , and at this time, the rotation speed of the motor 21 should be The driving speed corresponding to the actual pedaling speed of the user is reduced; thereby, the increasing speed of the reversing angle can be slowed down, that is, the consumption speed of the buffer space of the insert 522 in the recess 521 can be slowed down. . When the angle of the reversal is greater than or equal to the second angle θ 2 , that is, the motor 21 is controlled to be reversed to the first rotation speed, the motor 21 cannot drive the sleeve 32 to rotate forward. Thereby, it is ensured that the motor 21 does not generate an improper drive at a slow pedaling, thereby avoiding the possibility of accidents.

As also shown in FIG. 10, during normal pedaling, when the user wants to brake and then pedals, the drive ring 51 is rapidly reversed relative to the sleeve 32. And like the above move For example, when the relative reversal angle is greater than the third angle θ 3 , that is, the motor 21 is controlled to decelerate; and when the relative reversal angle is greater than the second angle θ 2 , the motor 21 is controlled to be reversed. Thereby, it is still ensured that the motor 21 does not cause improper driving of the sleeve 32, avoiding the possibility of accidents.

It is worth mentioning that the design of the third angle θ 3 is mainly for the motor 21 to be decelerated before the reversal, and thus can be faster in controlling the reversal of the motor 21 . However, it is also feasible to design the third angle θ 3 without retaining the second angle θ 2 . In this case, as long as the relative reversal angle is greater than the second angle θ 2 , that is, the motor 21 that is being rotated forward is directly controlled to be reversed, the effect of preventing improper driving in the present case can be achieved, thereby avoiding the possibility of accidents. .

32‧‧‧Sleeve

41‧‧‧ crankshaft

51‧‧‧ drive ring

52‧‧‧Delayed institutions

521‧‧‧Inlay

522‧‧‧Block

61‧‧‧Magnetic unit

62‧‧‧Magnetic mount

64‧‧‧ magnetic ring

71‧‧‧Magnetic sensor

Claims (9)

The utility model relates to a double magnetic ring rear stepping assisting interruption system for an electric assist bicycle, comprising: a microcomputer having a relative rotation reference table; a motor electrically connected to the microcomputer by a motor driver, whereby the microcomputer is a motor driver controls the motor; a large toothed disc is fixed to a sleeve, the sleeve is unidirectionally coupled to the motor, and is driven by the motor during forward rotation, and the motor is reversed when the motor is reversed The sleeve is idling; a crank shaft is rotatably disposed on the sleeve; a drive ring is sleeved and fixed to the crank shaft, and a delay mechanism is disposed between the drive ring and the sleeve; In the forward rotation, the driving ring drives the sleeve with the forward rotation of the crank shaft to rotate the large toothed disc synchronously; when the crank shaft is reversed during the forward rotation, the driving ring is driven by the delay mechanism. After the crankshaft is reversed by a first angle with respect to the sleeve, the sleeve is driven to reverse with the large toothed disc; and the magnetic unit has a magnet fixing seat and is disposed on the magnet fixing seat. a magnetic ring on the upper The base is fixed to the sleeve and the driving ring respectively, and rotates with the sleeve and the driving ring respectively; and the two magnetic sensors are electrically connected to the microcomputer and respectively correspond to the two magnetic rings, and the microcomputer is borrowed Determining whether the two magnetic rings have relative rotation by the signal sensed by the two magnetic detectors, thereby determining whether the sleeve and the driving ring have relative rotation; wherein the microcomputer is controlled by the relative rotation table Comparing the relative rotation relationship between the sleeve and the driving ring; when the relative rotation relationship shows that the driving ring is not moving relative to the sleeve, the microcomputer drives the motor according to a normal riding state; in the relative rotation relationship When the drive ring is reversed relative to the sleeve, and the relative reverse angle is greater than or equal to a second angle, the The microcomputer controls the motor to reverse at a first rotational speed to interrupt the assist; wherein the second angle is less than the first angle. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to the first aspect of the patent application, wherein: the delay mechanism has at least one slot formed by the inner ring surface of the sleeve and the outer ring surface of the drive ring Forming at least one of the inserts, the at least one insert being located in the at least one insert, and the space of the at least one insert is larger than the at least one insert, thereby enabling the at least one insert to be at least A recess is free to move within the first angle without contacting the slotted wall. According to the patent application scope 2, the double magnetic ring rear step assisted interruption system of the electric assist bicycle, wherein: the first angle is between 25 degrees and 90 degrees. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to the first application of the patent scope, wherein: the first rotation speed is greater than the actual reversal speed of the drive ring, and the actual reversal speed refers to the drive ring relative to The electric power assists the speed of the bicycle body. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to the first aspect of the patent application, wherein: in the relative rotation relationship, the driving ring is reversed with respect to the sleeve, and the relative reverse angle is greater than or equal to At a third angle, the microcomputer controls the motor in the forward rotation to decelerate, thereby interrupting the assist; the third angle is smaller than the second angle. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to claim 5, wherein the second angle is located in the interval of the first angle and overlaps the first angle. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to claim 6 is characterized in that: the third angle is located in the interval of the second angle and overlaps the second angle. A double magnetic ring rear step assisted interruption system for an electric assist bicycle according to claim 5, wherein: the second angle is between 10 degrees and 20 degrees; and the third angle is between 5 degrees and 10 degrees between. The double magnetic ring rear step assisted interruption system of the electric assist bicycle according to the first aspect of the patent application, wherein the sleeve is connected to the motor by a one-way device.