Motorcycle wheel speed signal acquisition sensor

Abstract

The utility model discloses a motorcycle wheel speed signal acquisition sensor, which comprises an induction magnetic seat and a signal acquisition device positioned on one side of the induction magnetic seat, a magnetic ring is sleeved on the outer ring of the induction magnetic seat, and the magnetic ring consists of a plurality of permanent magnets which are uniformly distributed along the circumferential direction; the radial magnetic poles of the circumferential surfaces and the axial magnetic poles of the shaft ends of every two adjacent permanent magnets are opposite in direction; along with the rotation of the magnetic ring, the Hall element sequentially encounters the permanent magnets with different magnetizing directions, so that the polarity of the output Hall voltage is changed, a pulse signal is formed, and the rotation speed of the wheel is further obtained by measuring the frequency of the pulse signal. The wheel speed signal acquisition sensor is compact in structure and convenient to install, can effectively and accurately detect wheel speed signals, and can adapt to measurement of wheel speeds of various vehicles.

Description

Technical Field

[0001] This utility model relates to the field of wheel speed signal acquisition technology, and in particular to a motorcycle wheel speed signal acquisition sensor. Background Technology

[0002] Currently, motorcycle wheel speed signals are typically acquired using a combination of wheel speed sensors and sensing gear rings, such as... Figure 1 As shown, the wheel speed sensor's sensing head consists of a permanent magnet, a Hall element, and electronic circuitry. When the motorcycle wheel rotates, the teeth on the sensing ring cut through the magnetic field generated by the permanent magnet, thus producing a changing electrical signal on the Hall element. This electrical signal changes with the rotation of the motorcycle wheel, reflecting the wheel's rotational speed. The electronic circuitry processes and amplifies the voltage signal generated by the Hall element, making it a signal that can be recognized by the motorcycle's control system.

[0003] However, some motorcycles have limited space near the wheel hub, making it impossible to directly install wheel speed sensors and sensing gear rings for wheel speed signal acquisition. If they are forcibly installed, it will cause conflicts with other components (such as the braking system and suspension system), affecting the normal operation of these components. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a motorcycle wheel speed signal acquisition sensor that is compact in structure, easy to install, and can effectively and accurately detect wheel speed signals.

[0005] Technical solution: To achieve the above objective, the present invention provides a motorcycle wheel speed signal acquisition sensor, including a sensing magnetic base and a signal acquisition device located on one side of the sensing magnetic base. A magnetic ring is fitted on the outer ring of the sensing magnetic base. The magnetic ring is composed of multiple permanent magnets evenly arranged along the circumference. The radial magnetic poles on the circumferential surface and the axial magnetic poles at the shaft end of each pair of adjacent permanent magnets are in opposite directions.

[0006] The induction magnetic base is fixed on the axle and rotates around its own central axis as the axle rotates.

[0007] The signal acquisition device is fixed on the vehicle frame.

[0008] The magnetic ring is made of magnetic material and magnetized to form a structure with a multi-pole magnetic field.

[0009] The internal magnetic flux at the shaft end of the magnetic ring is axially magnetized.

[0010] The signal acquisition device includes a Hall element that senses the change in the direction of the magnetic field of the magnetic ring and an electronic circuit that generates a pulse signal by changing the polarity of the Hall voltage output by the Hall element.

[0011] The Hall element includes a Hall plate with four leads, two of which are used for input excitation current and the other two for output Hall voltage. The magnetic field direction of the magnetic ring is perpendicular to the direction of the current on the Hall plate.

[0012] The outer ring of the induction magnetic base is provided with a slot or groove, and the magnetic ring is fixed in the slot or groove of the induction magnetic base by a buckle or screw.

[0013] An adhesive layer is provided between the inner ring of the magnetic ring and the outer ring of the induction magnetic base.

[0014] Beneficial effects: The present invention has the following advantages: 1. The wheel speed signal acquisition sensor has a compact structure and is easy to install, and can effectively and accurately detect wheel speed signals; 2. It can adapt to the measurement of wheel speed of various vehicles. Attached Figure Description

[0015] Figure 1 A schematic diagram illustrating the mechanism combination of wheel speed sensor and sensing gear ring in the prior art for acquiring wheel speed signals;

[0016] Figure 2 This is a schematic diagram of the wheel speed signal acquisition sensor structure;

[0017] Figure 3 This is a schematic diagram of the magnetic ring polarity distribution;

[0018] Figure 4 This is a schematic diagram of the signal acquisition device. Detailed Implementation

[0019] The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings.

[0020] like Figure 2-4 As shown, the wheel speed signal acquisition sensor includes a sensing magnetic base 1 fixed on the wheel axle and a signal acquisition device 2 located on one side of the sensing magnetic base 1. The sensing magnetic base 1 can rotate around its own central axis as the wheel axle rotates. A magnetic ring 3 is fitted on the outer ring of the sensing magnetic base 1. The magnetic ring 3 can be made of ferrite, neodymium iron boron or other magnetic materials. After being magnetized, the magnetic ring 3 forms a structure with a multi-pole magnetic field. Specifically, it is subjected to external multi-pole magnetization (radial external magnetization) using a magnetization device. That is, the internal magnetic flux of the circumferential surface of the magnetic ring is radially magnetized, and the internal magnetic flux of the axial end of the magnetic ring is axially magnetized. Finally, a structure of multiple permanent magnets evenly arranged along the circumferential direction is formed. The radial magnetization direction of the circumferential surface of each two adjacent permanent magnets is opposite, and the axial magnetization direction of the axial end of each two adjacent permanent magnets is opposite.

[0021] The signal acquisition device 2 is fixed to the frame on one side of the induction magnetic base 1 and remains stationary. The signal acquisition device 2 includes a Hall element 2.1 and an electronic circuit 2.2. The Hall element 2.1 uses the Hall effect to detect the magnetic field and its changes. Specifically, when current passes through the Hall element 2.1, if a magnetic field exists, the Hall element 2.1 will generate a potential difference in the direction perpendicular to the current and the magnetic field. This potential difference is called the Hall voltage. By measuring this Hall voltage, the strength and direction of the magnetic field can be determined.

[0022] In this embodiment, the Hall element 2.1 includes a Hall plate made of semiconductor material (such as indium arsenide, indium antimonide, etc.). The Hall plate has four leads, two of which are used for input excitation current, and the other two are used for output Hall voltage. When the excitation current passes through the Hall plate, the charge carriers (electrons or holes) in the current move along the current direction under the influence of the electric field. If a magnetic field is applied to the Hall plate in a direction perpendicular to the current, the charge carriers will be subjected to the Lorentz force. Due to the Lorentz force, the charge carriers will accumulate on one side of the Hall plate, forming charge accumulation, thereby generating a potential difference in the direction of the Hall plate perpendicular to both the current and the magnetic field. This potential difference is the Hall voltage. By changing the direction of the magnetic field, the polarity of the Hall voltage will change.

[0023] In this embodiment, since the radial magnetization directions of the circumferential surfaces of every two adjacent permanent magnets in the magnetic ring 3 are opposite, and the axial magnetization directions of the shaft ends of every two adjacent permanent magnets are opposite, the Hall element 2.1 is placed on one side of the magnetic ring 3. That is, the magnetic field direction of each permanent magnet is perpendicular to the surface of the Hall plate, and the magnetic field directions of two adjacent permanent magnets perpendicular to the surface of the Hall plate are opposite. As the magnetic ring 3 rotates, the Hall element 2.1 will encounter permanent magnets with different magnetization directions in sequence, causing the polarity of the Hall voltage to change.

[0024] Electronic circuit 2.2 generates a pulse signal by acquiring the polarity change of the Hall voltage output from Hall element 2.1. The frequency of the pulse signal is proportional to the rotational speed of magnetic ring 3. By measuring the frequency of the pulse signal, the rotational speed of magnetic ring 3 can be calculated.

[0025] In this embodiment, the outer ring of the sensing magnetic base 1 is provided with a slot or groove, and the magnetic ring 3 is fixed to the sensing magnetic base 1 by a snap-fit ​​or threaded connection. In some scenarios where frequent adjustment or replacement of the magnetic ring 3 is not required, the magnetic ring 3 can be fixed to the sensing magnetic base 1 by adhesive bonding to ensure its stability.

[0026] In this embodiment, the signal acquisition device 2 can be fixed to the vehicle frame using screws, clips, adhesive, or other connection methods. Simultaneously, the fixing position of the signal acquisition device 2 needs to ensure that it is accurately aligned with the magnetic ring so that the Hall element can effectively detect changes in the polarity of the magnetic field.

Claims

1. A motorcycle wheel speed signal acquisition sensor, characterized in that, Includes an induction magnetic base (1) and a signal acquisition device (2) located on one side of the induction magnetic base (1). A magnetic ring (3) is fitted on the outer ring of the induction magnetic base (1). The magnetic ring (3) is composed of multiple permanent magnets evenly arranged along the circumference. The radial magnetic poles on the circumferential surface and the axial magnetic poles at the shaft end of each two adjacent permanent magnets are opposite in direction.

2. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, The induction magnetic base (1) is fixed on the axle and rotates around its own central axis as the axle rotates.

3. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, The signal acquisition device (2) is fixed on the vehicle frame.

4. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, The magnetic ring (3) is made of magnetic material and magnetized to form a structure with a multi-pole magnetic field.

5. The motorcycle wheel speed signal acquisition sensor according to claim 4, characterized in that, The internal magnetic flux at the shaft end of the magnetic ring (3) is axially magnetized.

6. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, The signal acquisition device (2) includes a Hall element (2.1) that senses the change in the magnetic field direction of the magnetic ring (3) and an electronic circuit (2.2) that forms a pulse signal by changing the polarity of the Hall voltage output by the Hall element (2.1).

7. The motorcycle wheel speed signal acquisition sensor according to claim 6, characterized in that, The Hall element (2.1) includes a Hall plate with four leads, two of which are used to input excitation current and the other two are used to output Hall voltage. The magnetic field direction of the magnetic ring (3) is perpendicular to the direction of the current on the Hall plate.

8. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, The outer ring of the induction magnetic base (1) is provided with a slot or groove, and the magnetic ring (3) is fixed in the slot or groove of the induction magnetic base (1) by a buckle or screw.

9. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that, An adhesive layer is provided between the inner ring of the magnetic ring (3) and the outer ring of the induction magnetic base (1).

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