Rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for power-assisted bicycle

A technology for assisting bicycles and magnetic flux, which is applied in the direction of transmission of sensing components, vehicle components, transportation and packaging using electric/magnetic devices, and can solve the problems of different, no control signals, and inconsistencies.

Active Publication Date: 2012-11-28
徐州华创电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Disadvantages (1) Using two permanent magnets with no difference to represent the fixed positions of the two pedals, only multiple Halls can be used to represent the pedals Rotation position: There is no difference between the two permanent magnets. The advantage is that the fixed positions of the two pedals can be expressed regardless of the left and right feet, so that the left and right feet can generate power assistance requirements, which can produce the same motor power assistance effect; but the disadvantage is that The permanent magnetic steel itself cannot indicate the rotation position of the pedal, but can only use multiple Halls at different corner positions to indicate the rotation position of the pedal, so it is not possible to use only one Hall, but must use multiple Halls
[0016] Disadvantage (2) Only one Hall cannot be used, but three Halls will inevitably cause the original segmentation error of the three control signals, which will distort the power-assist demand model, naturally The generation of power output is inconsistent with the demand for power assistance: no matter whether the power-assisted bicycle has one or two motors, the sensor signal for controlling the motor can only be controlled by using one sensor signal input to the motor controller; and the patent uses three sensors. If Hall controls the motor, the three control signals of the three Halls must be combined into one combined control signal before it can be input to the motor controller
The sensing parameters of the three Halls cannot be the same, especially due to changes in ambient temperature and long-term use, the sensing parameters of the three Halls may vary greatly. The output voltages are different, resulting in different power output of the motor, and the power output is inconsistent with the power demand; similarly, when the power demand is the same, the outputs of different Halls may be the same voltage, resulting in the same power output of the motor, and also There is a problem that the power output is inconsistent with the power demand
[0017] Disadvantages (3) The combined control signal is prone to signal drift, which makes the combined control signal not match the motor controller, and the power-assisted demand model is distorted: due to changes in ambient temperature and use time After a long period of time, the sensing parameters of the three Halls may vary greatly, and the connection points of the three control signals of the three Halls will inevitably change, so the combined control signals generated by the same boosting demand will produce segmental signal drift. Combining the control signals as a whole produces signal distortion, that is, the power-assist demand model is distorted, causing the motor controller to choose any one of the three control signals as a reference, resulting in the inconsistency between the power-assisted output and the power-assisted demand
[0018] Disadvantages Sensing points cannot be increased arbitrarily, if there are too few sensing points, the operation of the motor will not be stable, making the rider feel very uncomfortable: due to the disadvantages (1) and disadvantage (2) are most caused by the number of Halls being greater than one. Obviously, the more the number of Halls, the more serious the disadvantages (1) and (2) are.
Therefore, the power-assisted bicycle provided by this patent can only be a very bad power-assisted bicycle that makes the rider feel comfortable.
[0019] Disadvantages (5) The signal blind area reaches 42 degrees, and when the power is needed when starting, it is impossible to get it: as we all know, the torque of the bicycle pedal is the smallest at the apex , from the angle of 10-45 degrees away from the top is the area that needs the most assistance, but the angle between the Halls in this patent is 42.5-43.5 degrees, and there is no Hall in the area of ​​10-42 degrees away from the top of the pedal. There is no control signal, and the result is when the assist is most needed, but the motor of the assist bicycle cannot assist
[0020] In short, this patent is a technical solution for using multiple Halls to control the booster mode, because only multiple Halls can be used to represent the rotation position of the pedal, and the multiple control signals of multiple Halls must have original errors, and the combined control signals It is also easy to produce signal drift, which can cause distortion of the assist demand model, that is, the same assist demand at different times, but different assist effects; the more the number of Halls, the more serious the distortion of the assist demand model, limiting the number of Halls, If the number of halls is too small, the motor will not run smoothly, which will make the rider feel very uncomfortable, and will not get assistance when starting
To make it undistorted to help the demand model, and to ensure the smooth operation of the motor, there are always two issues. It is impossible to have both.

Method used

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  • Rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for power-assisted bicycle
  • Rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for power-assisted bicycle
  • Rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for power-assisted bicycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Embodiment 1, multi-magnetic blocks for power-assisted bicycles Location and magnetic flux changes with a turntable sensor

[0107] Such as figure 1 , 3 , the sensor in this embodiment includes a sensor element connected in sequence, a booster model processor 21, a digital-to-analog converter 27 and an operational amplifier 28;

[0108] [1] The sensing element is an element that converts the rotational motion of the rotating disk 1 into a rectangular wave signal output;

[0109] The sensing element is to use a high-strength plastic rotating disk 1 with a diameter of 10.0 cm to set 20 permanent magnets 2 with a diameter of 0.8 cm on one surface, and the magnetic flux is 146---279 (B·H)max / KJ·m -3 Different selection values ​​within the range, and the magnetic flux of adjacent permanent magnet block 2 is not equal. The structure of rotating disk 1, permanent magnet block 2 and Hall 3 is as follows:

[0110] Each permanent magnet block 2 is fixed in the circle 6 range...

Embodiment 2

[0126] Embodiment 2, multi-magnetic blocks for high-density power-assisted bicycles Location and magnetic flux changes with a turntable sensor

[0127] Such as figure 2 , 3 1. A high-strength aluminum rotating disk 1 with a diameter of 10.0 cm is provided with 40 permanent magnet blocks 2 with a diameter of 0.6 cm. The magnetic flux of the permanent magnet block 2 is 146---279 (B·H)max / KJ·m -3 Different selection values ​​within the range, and the magnetic flux of adjacent permanent magnet block 2 is not equal , Hall 3 keeps a distance of 0.2 cm from each permanent magnet 2 in the rotating state, so that when each rotating permanent magnet 2 passes through Hall 3, Hall 3 can generate a corresponding rectangular wave signal output. Other structures are the same as in Embodiment 1.

Embodiment 3

[0128] Embodiment 3, the power-assisted bicycle with concrete circuit has multiple magnetic blocks Location and magnetic flux changes with a turntable sensor

[0129] Such as figure 1 , 4 , the sensor in this embodiment includes a sensor element connected in sequence, a booster model processor 21, a digital-to-analog converter 27 and an operational amplifier 28;

[0130] [1] The Hall 3 in the sensing element is UGN3075; the structure of other elements and elements in the sensing element is the same as that in Embodiment 1;

[0131] [2] The auxiliary model processor 21 selects the single-chip microcomputer 31 to complete all functions, and the single-chip microcomputer 31 selects AT89S52. That is, the AT89S52 single-chip microcomputer 31 completes all functions of the analog-to-digital conversion and the wave width peak recognizer 22 , the power-assisted starting point selector 23 , the magnet speed calculator 24 , the power-assisted model memory 25 and the power-assisted ...

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Abstract

The invention relates to a rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for a power-assisted bicycle, belonging to a technology for providing a control signal for multi-point position magnetic induction. The rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for the power-assisted bicycle disclosed by the invention comprises a sensing element, a power-assisted model processor, a digital-to-analog converter and an operational amplifier which are sequentially connected, wherein the sensing element comprises multiple permanent magnets which are arranged on a rotary table and are different from spaces and magnetic fluxes, magnetic polarities of adjacent permanent magnets are opposite, namely a distribution manner is an N pole, an S pole, an N pole...; and a Hall is arranged at a position close to the permanent magnets. The rotary table type sensor with multiple magnet positions and multiple magnetic flux variations for the power-assisted bicycle disclosed by the invention has the advantages that magnetic polarities of adjacent permanent magnets are in an NS opposite distribution manner, thus the Hall can acquire a square-wave signal, and digital processing on a signal can be carried out conveniently; and the spaces and the magnetic fluxes are different, thus the square-wave signal can show positions of the permanent magnets on the rotary table, applications of different square waves can be determined, and the sensor disclosed by the invention can output an electric signal which is matched with motion positions of the permanent magnets and has a manually set control model.

Description

Technical field [0001] The present invention belongs to the technology field of magnetic induction signal, especially involving a multi -bit magnetic induction technology to provide control signals on a rotor part. Background technique [0002] China Patent 201020295192.0 "Hook Claw Torque Sensing Device" applied for the China Patent Industry (Kunshan) Co., Ltd. revealed a sensing device for bicycles. The sensing device includes magnetic parts and elastic pieces.Sensing device.After a long period of use, the elastic coefficient change of elastic parts will cause the sensing signal and the control effect of the controlled motor to change, and the help effect becomes unsuccessful with the help of people.And the design structure of elasticity is complex and the manufacturing cost is high. [0003] The Chinese Patent 01201843.0 "Electric Help Automatically detecting Device" applied for Beijing University of Science and Technology has released an automatic detection device of electric...

Claims

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Application Information

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IPC IPC(8): B62M6/50G01D5/244
Inventor黄强
Owner徐州华创电子有限公司