Abs wheel speed sensor based on ak communication protocol

Abstract

The utility model discloses an ABS wheel speed sensor based on AK communication protocol, including framework spare, pin piece, difference hall sensor and shell, the utility model discloses the purpose is in difference hall sensor built -in signal amplification, filter, dynamic self -calibration function, the original signal of direct processing hall response department, need not external conditioning circuit, therefore difference hall sensor is directly connected with pin piece, and the additional PCB board structure in traditional scheme is saved, reduces the number of mounting procedure and the soldering tin point, reduces the risk of false soldering, makes the sensor more reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of sensors, and in particular to an ABS wheel speed sensor based on the AK communication protocol. Background Technology

[0002] In automotive anti-lock braking systems, wheel speed sensors are one of the core components, used to monitor wheel speed in real time and provide accurate signals to the control unit to ensure vehicle stability during braking. Traditional wheel speed sensors usually use magnetoresistive or Hall effect principles, and their signal amplification, filtering, and temperature compensation rely on external PCB boards, resulting in a more complex sensor structure and more solder joints, which increases the risk of failures such as cold solder joints and poor contact. Utility Model Content

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: an ABS wheel speed sensor based on the AK communication protocol, including a skeleton, a pin, a differential Hall sensor and a housing. The pin and the differential Hall sensor are formed by injection molding the skeleton in one step, and the pin and the differential Hall sensor are respectively located at both ends of the skeleton. The skeleton has an opening groove for cutting the pin and an opening groove for welding the pin and the differential Hall sensor. The skeleton is formed by injection molding the housing in a second step. The pin and the differential Hall sensor are both located inside the housing, and the tail of the pin is combined with the housing to form a socket for connecting to an external circuit.

[0004] Using the above technical solution, the differential Hall sensor has built-in signal amplification, filtering, and dynamic self-calibration functions, directly processing the raw signal of the Hall sensing unit without the need for external conditioning circuits. Therefore, the differential Hall sensor is directly connected to the pin assembly, eliminating the need for additional PCB board structure in traditional solutions, reducing installation steps and the number of solder points, lowering the risk of cold solder joints, and making the sensor more reliable.

[0005] The present invention is further configured such that the differential Hall sensor includes a sensing part, a first connecting part, a signal processing part, and a second connecting part. The sensing part is electrically connected to the signal processing part through the first connecting part, and the outer shell and the second connecting part are combined to form a socket part.

[0006] Using the above technical solution, the differential Hall sensor model TLE4941plusC adopts a 2P current interface, has stable signal output, strong anti-interference ability, and meets the requirements of the AK communication protocol.

[0007] The present invention is further configured such that the skeleton component includes an integrally formed side mounting portion, a cylindrical portion one and a cylindrical portion two, the sensing portion is disposed in the side mounting portion, the signal processing portion is embedded in the cylindrical portion one, the pin component extends through the cylindrical portion two to the cylindrical portion one, and the opening groove one and the opening groove two are disposed at one point in the cylindrical portion.

[0008] By adopting the above technical solution, a skeleton component is integrally injection molded on the basis of the pin component and the differential Hall sensor, so that the pin component and the differential Hall sensor are directly embedded in the skeleton component, simplifying the installation process.

[0009] The present invention is further configured such that the side mounting portion is provided with a stepped surface for abutting the sensing portion and an isolation groove for accommodating the connecting portion one, and positioning portions for controlling the flatness of the stepped surface are provided on both sides of the side mounting portion, the positioning portions extending outward through the outer shell.

[0010] Furthermore, the connecting part is provided with a mounting groove, and the isolation groove is provided with a positioning post that is adapted to the mounting groove.

[0011] By adopting the above technical solution, the sensing part is exposed during the first injection molding, and during the second injection molding, the thickness of the outer shell covering the sensing part is only 0.5mm, which reduces the attenuation effect of the plastic encapsulation on the magnetic field and improves the signal sensitivity.

[0012] The present invention is further configured such that the insert member has symmetrically distributed inserts, and a punched portion is provided between adjacent inserts. The punched portion is located at one of the opening slots. The insert has a connecting portion three corresponding to the connecting portion two, and the connecting portion three has a positioning hole.

[0013] Furthermore, the connecting portion three is provided with a solder layer.

[0014] Using the above technical solution, during welding, the high-temperature push rod passes through the second opening slot to abut against the pin, and the rod head disperses the pressure through the positioning hole to achieve rapid positioning, so that the solder layer on the surface of the pin melts quickly and is quickly pressure welded to the differential Hall sensor. The punching machine passes through the first opening slot to cut off the punching part of the pin, so that the pin is separated into an independent 2P pin. The production process is simple and meets the needs of mass production.

[0015] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model after one-time injection molding;

[0018] Figure 3 This is a front view of the differential Hall sensor of this utility model;

[0019] Figure 4 This is a structural schematic diagram of the skeleton component of this utility model;

[0020] Figure 5This is a front view of the pin component of this utility model;

[0021] Wherein: 1-Skeleton component, 2-Pin component, 3-Differential Hall sensor, 4-Housing shell, 5-Socket part, 11-Opening slot one, 12-Opening slot two, 13-Side mounting part, 14-Cylindrical part one, 15-Cylindrical part two, 16-Step surface, 17-Isolation groove, 18-Positioning part, 19-Positioning post, 21-Pin, 22-Punching part, 23-Connecting part three, 24-Positioning hole, 25-Solder layer, 31-Sensing part, 32-Connecting part one, 33-Signal processing part, 34-Connecting part two, 35-Mounting groove; Detailed Implementation

[0022] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0023] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0024] like Figure 1 , 2 As shown, this utility model discloses an ABS wheel speed sensor based on the AK communication protocol, including a frame 1, a pin 2, a differential Hall sensor 3, and a housing 4. The pin 2 and the differential Hall sensor 3 are formed by injection molding the frame 1 in one step, and the pin 2 and the differential Hall sensor 3 are respectively disposed at both ends of the frame 1. The frame 1 is provided with an opening groove 11 for cutting the pin 2 and an opening groove 12 for welding the pin 2 and the differential Hall sensor 3. The frame 1 is formed by injection molding the housing 4 in two steps. The pin 2 and the differential Hall sensor 3 are both disposed inside the housing 4, and the tail of the pin 2 is combined with the housing 4 to form a socket 5 for connecting to an external circuit.

[0025] Combination Figure 3 As shown, in this embodiment, the differential Hall sensor 3 includes a sensing part 31, a first connection part 32, a signal processing part 33, and a second connection part 34. The sensing part 31 is electrically connected to the signal processing part 33 through the first connection part 32. The housing 4 and the second connection part 34 are combined to form a socket part 5.

[0026] Combination Figure 4As shown, in this embodiment, the skeleton component 1 includes an integrally formed side mounting portion 13, a cylindrical portion 14, and a cylindrical portion 15. The sensing portion 31 is disposed in the side mounting portion 13, the signal processing portion 33 is embedded in the cylindrical portion 14, the pin component 2 extends through the cylindrical portion 15 to the cylindrical portion 14, and the opening slot 11 and the opening slot 2 12 are disposed at the cylindrical portion 14. The side mounting portion 13 is provided with a stepped surface 16 for abutting the sensing portion 31, and an isolation groove 17 for accommodating the connecting portion 32. The side mounting portion 13 is provided with positioning portions 18 on both sides for controlling the flatness of the stepped surface 16. The positioning portions 18 extend outward through the outer shell 4. The connecting portion 32 is provided with a mounting groove 35, and the isolation groove 17 is provided with a positioning post 19 adapted to the mounting groove 35. During the first injection molding, the sensing portion 31 is exposed. During the second injection molding, the thickness of the outer shell 4 covering the sensing portion 31 is only 0.5mm, reducing the attenuation effect of the plastic encapsulation on the magnetic field.

[0027] Combination Figure 5 As shown, in this embodiment, the pin member 2 is provided with symmetrically distributed pins 21, and a punched portion 22 is provided between adjacent pins 21. The punched portion 22 is provided at the opening slot 11. The pin 21 is provided with a connecting portion 3 23 corresponding to the connecting portion 2 34. The connecting portion 3 23 is provided with a positioning hole 24 and a solder layer 25.

[0028] In this invention, during the injection molding stage, the pin 2 and the differential Hall sensor 3 are fixed on the mold, and the connecting part 24 and the connecting part 33 form an overlapping docking structure, forming the skeleton 1 through an integral injection molding process. During the welding stage, the high-temperature ejector rod passes through the opening slot 22 to abut against the pin 21, and the rod head disperses the pressure through the positioning hole 24 to achieve rapid positioning, so that the solder layer 25 on the surface of the pin 21 melts quickly and is quickly pressure welded to the differential Hall sensor 3. The punching machine passes through the opening slot 11 to cut the punching part 22 of the pin 2, so that the pin 2 is separated into an independent 2P pin 21. After the pre-power-on test is qualified, the opening slot 22 is filled with resin to protect the solder joint. Finally, the shell 4 is formed by secondary injection molding on the skeleton 1. The overall production process is simple and suitable for mass production.

[0029] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ABS wheel speed sensor based on the AK communication protocol, characterized in that, The device includes a skeleton (1), a pin (2), a differential Hall sensor (3), and a housing (4). The pin (2) and the differential Hall sensor (3) are formed by injection molding the skeleton (1) in one step. The pin (2) and the differential Hall sensor (3) are respectively located at both ends of the skeleton (1). The skeleton (1) has an opening groove (11) for cutting the pin (2) and an opening groove (12) for welding the pin (2) and the differential Hall sensor (3). The skeleton (1) is formed by injection molding the housing (4) in two steps. The pin (2) and the differential Hall sensor (3) are both located inside the housing (4). The tail of the pin (2) is combined with the housing (4) to form a socket (5) for connecting to an external circuit.

2. The ABS wheel speed sensor based on the AK communication protocol according to claim 1, characterized in that: The differential Hall sensor (3) includes a sensing part (31), a first connection part (32), a signal processing part (33) and a second connection part (34). The sensing part (31) is electrically connected to the signal processing part (33) through the first connection part (32). The outer shell (4) and the second connection part (34) are combined to form a socket part (5).

3. An ABS wheel speed sensor based on the AK communication protocol according to claim 2, characterized in that: The skeleton component (1) includes an integrally formed side mounting part (13), a cylindrical part one (14) and a cylindrical part two (15). The sensing part (31) is disposed on the side mounting part (13), the signal processing part (33) is embedded in the cylindrical part one (14), the pin component (2) extends through the cylindrical part two (15) to the cylindrical part one (14), and the opening slot one (11) and the opening slot two (12) are disposed at the cylindrical part one (14).

4. An ABS wheel speed sensor based on the AK communication protocol according to claim 3, characterized in that: The side mounting portion (13) is provided with a stepped surface (16) for abutting the sensing portion (31) and an isolation groove (17) for accommodating the connecting portion (32). The side mounting portion (13) is provided with positioning portions (18) on both sides for controlling the flatness of the stepped surface (16). The positioning portions (18) extend outward through the outer shell (4).

5. An ABS wheel speed sensor based on the AK communication protocol according to claim 4, characterized in that: The connecting part (32) is provided with a mounting groove (35), and the isolation groove (17) is provided with a positioning post (19) that is adapted to the mounting groove (35).

6. An ABS wheel speed sensor based on the AK communication protocol according to claim 2, characterized in that: The insert (2) has symmetrically distributed inserts (21), and a punched portion (22) is provided between adjacent inserts (21). The punched portion (22) is located at the opening slot (11). The insert (21) has a connecting portion (23) corresponding to the connecting portion (34). The connecting portion (23) has a positioning hole (24).

7. An ABS wheel speed sensor based on the AK communication protocol according to claim 6, characterized in that: The connecting part three (23) is provided with a solder layer (25).

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