Motorcycle wheel speed signal acquisition sensor

Abstract

A motorcycle wheel speed signal acquisition sensor disclosed by the present invention comprises an induction magnetic seat and a signal acquisition device located at one side of the induction magnetic seat, the outer ring of the induction magnetic seat is sleeved with a magnetic ring, and the magnetic ring is composed of a plurality of permanent magnets uniformly arranged 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] The invention relates to the technical field of wheel speed signal acquisition, in particular to a wheel speed signal acquisition sensor for a motorcycle. Background Art

[0002] At present, the wheel speed signal of motorcycle is usually collected by using a combination of wheel speed sensor and induction gear ring, such as Figure 1 As shown in the figure, the sensor head in the wheel speed sensor consists of a permanent magnet, a Hall element and an electronic circuit. When the motorcycle wheel rotates, the teeth on the induction ring will cut the magnetic field generated by the permanent magnet, thereby generating a changing electrical signal on the Hall element. This electrical signal will change as the motorcycle wheel rotates, thus reflecting the rotation speed of the wheel. The electronic circuit processes and amplifies the voltage signal generated by the Hall element, making it a signal that can be recognized by the motorcycle control system.

[0003] However, the space near the wheel hub of some motorcycles is limited, and the wheel speed sensor and induction ring gear cannot be directly installed to collect the wheel speed signal. If they are forcibly installed, it will cause conflicts with other components (such as the brake system, suspension system, etc.), affecting the normal operation of these components. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a motorcycle wheel speed signal acquisition sensor which has a compact structure, is easy to install, and can effectively and accurately detect wheel speed signals.

[0005] Technical solution: To achieve the above-mentioned purpose, a motorcycle wheel speed signal acquisition sensor described in the present invention includes an induction magnetic base and a signal collector located on one side of the induction magnetic base. A magnetic ring is mounted on the outer ring of the induction magnetic base. The magnetic ring is composed of a plurality of permanent magnets evenly arranged along the circumferential direction. The radial magnetic poles on the circumferential surfaces of each two adjacent permanent magnets and the axial magnetic poles at the shaft end are in opposite directions.

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

[0007] Wherein, the signal collector is fixed on the vehicle frame.

[0008] Wherein, the magnetic ring is made of magnetic material and is magnetized to form a structure with a multi-polar magnetic field.

[0009] Wherein, the internal magnetic flux of the axial end of the magnetic ring is axial magnetization.

[0010] The signal collector includes a Hall element that senses the change in direction of the magnetic field of the magnetic ring and an electronic circuit that changes the polarity of the Hall voltage output by the Hall element to form a pulse signal.

[0011] The Hall element 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 is perpendicular to the direction of the current on the Hall plate.

[0012] Wherein, the outer ring of the induction magnetic base is provided with a slot or a groove, and the magnetic ring is fixed in the slot or the groove of the induction magnetic base by means of buckles or screws.

[0013] Wherein, an adhesive layer is arranged between the inner ring of the magnetic ring and the outer ring of the induction magnetic seat.

[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 the wheel speed signal; 2. It can adapt to the measurement of wheel speeds of various vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a wheel speed sensor and an induction gear ring mechanism combination for collecting wheel speed signals in the prior art;

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

[0017] Figure 3 Schematic diagram of magnetic ring polarity distribution;

[0018] Figure 4 This is a schematic diagram of the signal collector structure. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below in conjunction with the embodiments and drawings.

[0020] like Figure 2-4 As shown, the wheel speed signal acquisition sensor includes an induction magnetic base 1 fixed on the wheel axle, and a signal collector 2 located on one side of the induction magnetic base 1. The induction magnetic base 1 can rotate around its own central axis as the wheel axle rotates, and a magnetic ring 3 is mounted on the outer ring of the induction magnetic base 1. The magnetic ring 3 can be made of ferrite, neodymium iron boron or other magnetic materials. After the magnetic ring 3 is magnetized, a structure with a multi-pole magnetic field is formed. Specifically, the magnetization equipment is used to perform external multi-pole magnetization (radial external magnetization), that is, the internal magnetic flux of the circumferential surface of the magnetic ring is radial magnetization, and the internal magnetic flux of the axial end of the magnetic ring is axial magnetization, and finally a structure of multiple permanent magnets uniformly arranged in the circumferential direction is formed, and the radial magnetization directions of the circumferential surfaces of each two adjacent permanent magnets are opposite, and the axial magnetization directions of the axial ends of each two adjacent permanent magnets are opposite.

[0021] The signal collector 2 is fixed on the frame on one side of the induction magnetic base 1 and remains stationary. The signal collector 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 there is a magnetic field, 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 known.

[0022] In this embodiment, the Hall element 2.1 includes a Hall plate made of semiconductor materials (such as indium arsenide, indium antimonide, etc.), and there are four leads on the Hall plate, two of which are used to input the excitation current, and the other two are used to output the Hall voltage. When the excitation current passes through the Hall plate, the carriers (electrons or holes) in the current move along the current direction under the action of the electric field. If a magnetic field is applied to the Hall plate in a direction perpendicular to the current, the carriers will be affected by the Lorentz force. Due to the action of the Lorentz force, the carriers will accumulate on one side of the Hall plate to form charge accumulation, thereby generating a potential difference in the direction of the Hall plate perpendicular to 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 each two adjacent permanent magnets in the magnetic ring 3 are opposite, and the axial magnetization directions of the axial ends of each 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 the 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 successively encounter permanent magnets with different magnetization directions, resulting in a change in the polarity of the Hall voltage.

[0024] The electronic circuit 2.2 collects the polarity change of the Hall voltage output by the Hall element 2.1 to form a pulse signal, and the frequency of the pulse signal is proportional to the rotation speed of the magnetic ring 3. By measuring the frequency of the pulse signal, the rotation speed of the magnetic ring 3 can be calculated.

[0025] In this embodiment, the outer ring of the induction magnetic base 1 is provided with a slot or groove, and the magnetic ring 3 is fixed to the induction magnetic base 1 by a snap or threaded connection. In some scenarios where the magnetic ring 3 does not need to be frequently adjusted or replaced, the magnetic ring 3 can be fixed to the induction magnetic base 1 by an adhesive connection to ensure its stability.

[0026] In this embodiment, the signal collector 2 can be fixed on the vehicle frame by screws, buckles, bonding, etc. At the same time, the fixing position of the signal collector 2 needs to ensure that it can accurately align with the magnetic ring so that the Hall element can effectively detect the polarity change of the magnetic field.

Claims

1. A motorcycle wheel speed signal acquisition sensor, characterized in that: The invention comprises an induction magnetic base (1) and a signal collector (2) located on one side of the induction magnetic base (1); a magnetic ring (3) is mounted on the outer ring of the induction magnetic base (1); the magnetic ring (3) is composed of a plurality of permanent magnets evenly arranged along the circumferential direction; the radial magnetic poles on the circumferential surfaces of each two adjacent permanent magnets and the axial magnetic poles at the shaft ends are in opposite directions.

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

3. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that: The signal collector (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 is 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 axial 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 collector (2) comprises a Hall element (2.1) for sensing changes in the direction of the magnetic field of a magnetic ring (3) and an electronic circuit (2.2) for changing the polarity of a Hall voltage output by the Hall element (2.1) to form a pulse signal.

7. The motorcycle wheel speed signal acquisition sensor according to claim 1, characterized in that: The Hall element (2.1) comprises a Hall plate, on which there are 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 a groove, and the magnetic ring (3) is fixed in the slot or the groove of the induction magnetic base (1) by means of buckles or screws.

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 seat (1).

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