A high-precision wheel speed sensor

Abstract

The present invention discloses a high-precision wheel speed sensor, which relates to the field of wheel speed sensors, including a front wheel sensor assembly and a rear wheel sensor assembly, wherein the front wheel sensor assembly includes a front sensor head, the rear end of the front sensor head is provided with a front sensor housing, and the front end of the front sensor head is provided with a toothed disc. The present invention sets the front wheel sensor assembly and the rear wheel sensor assembly, wherein the front wheel sensor assembly is based on an electromagnetic sensor, and the magnetoelectric wheel speed sensor has a strong dynamic measurement capability, and is installed on the front wheel, which is more reliable and safe, and the rear wheel sensor assembly is based on a Hall wheel speed sensor, and the output signal voltage amplitude is not affected by the vehicle speed and has a high frequency response, and is installed on the rear wheel, which can detect the rotation speed of the rear wheel more timely, clean the protective cover with air, remove metal debris, extend the service life of the wheel speed sensor, and avoid the impact and damage to the socket caused by gravel and other shadow objects splashed during the vehicle driving.

Description

Technical Field

[0001] The invention relates to the technical field of wheel speed sensors, in particular to a high-precision wheel speed sensor. Background Art

[0002] Wheel speed sensors, also known as wheel speed sensors, are mainly used to measure the speed of car wheels. This information is crucial for modern cars, and the vehicle dynamic control system (VDC), electronic stability program (ESP), anti-lock braking system (ABS), automatic transmission control system, etc. all require wheel speed information.

[0003] At present, most of the wheel speed sensors of automobiles are of a fixed type. However, since the front wheels of the automobile involve steering, the wheel speed sensors may be affected by more lateral forces and vibrations. Therefore, the wheel speed sensors are required to have better dynamic measurement capabilities. The rear wheels of the automobile are mainly responsible for driving and supporting the weight of the vehicle body. Therefore, the sensors require a higher response frequency. Fixed wheel speed sensors cannot achieve the above effects. In addition, since the installation position of the wheel speed sensor is close to the brake disc of the automobile, the sensor installation position is close to the brake disc, and metal debris can easily adhere to the front end of the protective cover, thereby affecting the sensitivity of the sensor. Metal debris attached to the front end of the protective cover for a long time may also corrode the protective cover and cause damage to the sensor. Summary of the invention

[0004] The object of the present invention is to provide a high-precision wheel speed sensor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a high-precision wheel speed sensor, comprising a front wheel sensor assembly and a rear wheel sensor assembly, wherein the front wheel sensor assembly comprises a front sensor sensor head, a front sensor housing is disposed at the rear end of the front sensor sensor head, and a toothed disc is disposed at the front end of the front sensor sensor head; the rear wheel sensor assembly comprises a rear sensor sensor head, a rear sensor housing is disposed at the rear end of the rear sensor sensor head, and a Hall plate is disposed at the front end of the rear sensor sensor head; the front sensor sensor head and the rear sensor sensor head are connected to each other. Chips are installed inside the sensor heads, power sockets are provided inside the front sensor housing and the rear sensor housing, signal sockets are provided inside the front sensor housing and the rear sensor housing near the power sockets, protective covers are installed at the front ends of the front sensor heads and the rear sensor heads, two brackets are provided on one side of the protective cover, an air inlet is hingedly installed between the two brackets, a hose is provided at one end of the air inlet, a through pipe is provided at one end of the hose, and a plurality of air pipes are equidistantly arranged in a ring at one end of the through pipe.

[0006] Preferably, a front mounting frame is provided at the bottom end of the front sensor housing, and a front mounting hole is formed through the bottom of the front mounting frame. The front mounting frame installs the front wheel sensor assembly near the wheel hub or brake drum of the front wheel through the front mounting hole to ensure the stability of the installation so that the front wheel sensor assembly can monitor the wheel speed.

[0007] Preferably, a rear mounting frame is provided at the bottom end of the rear sensor housing, and a rear mounting hole is opened through the bottom of the rear mounting frame. The rear mounting frame installs the rear wheel sensor assembly near the wheel hub or differential through the rear mounting hole to ensure the stability of the installation so that the rear wheel sensor assembly can monitor the wheel speed.

[0008] Preferably, screws are threadedly installed on both sides of the air inlet, and one end of the screw extends through the corresponding bracket. Since the front wheel speed sensor assembly is installed vertically above the front wheel, the air inlet needs to be adjusted to a perpendicular state with the protective cover so that the opening of the air inlet faces the front of the vehicle. When the vehicle is running at high speed, air will enter the hose through the opening of the air inlet. The rear wheel speed sensor assembly is installed on one side of the rear wheel. Therefore, the air inlet needs to be adjusted to a parallel state with the protective cover so that the opening of the air inlet faces the front of the vehicle. When the vehicle is running at high speed, air will enter the hose through the opening of the air inlet.

[0009] Preferably, one end of several of the air pipes extends out of the front end of the protective cover, and several of the extended ends of the air pipes are provided with air jets at the middle position toward the front end of the protective cover. When the air pipe is used for air transmission, the air pipe transports the gas to the position of the air jet for blowing to clean the front end of the protective cover.

[0010] Preferably, the interior of the front sensor housing and the rear sensor housing are both connected to a transmission line group, and the outer surface of the transmission line group is connected to a movable protective shell. The transmission line group is connected to the power socket and the signal socket to ensure that the electromagnetic signals received by the front wheel speed sensor and the rear wheel speed sensor can be transmitted to the vehicle's ABS system, ensuring a quick response in emergency braking or vehicle skidding to maintain the stability and controllability of the vehicle. The movable protective shell protects the rear ends of the front sensor housing and the rear sensor housing to avoid impact damage to the socket when the vehicle is driving.

[0011] Preferably, both sides of the movable protective shell are installed with card blocks, and both sides of the front sensor shell and the rear sensor shell are installed with plug blocks, ensuring that the movable protective shell can be docked and fitted with the corresponding front sensor shell and the rear sensor shell to ensure the protective effect.

[0012] Preferably, a slot is provided at one end of the card block, a locking block matching the slot is provided at one end of the insert block, a spring button is provided at the top of the locking block, a hole matching the spring button is provided at the top of the slot, and when the locking block is inserted into the slot, the spring button overlaps with the hole to lock the movable protective shell, thereby ensuring that the movable protective shell will not fall off. When the movable protective shell needs to be opened, the spring button can be pressed and the movable protective shell can be pulled to be disassembled.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The high-precision wheel speed sensor is provided with a front wheel sensor assembly and a rear wheel sensor assembly. The front wheel sensor assembly is installed near the front wheel hub. The front sensor rotates synchronously with the front wheel through a sprocket. The teeth and gaps of the sprocket pass through the sensor's magnetic field in sequence and quickly, changing the magnetic resistance of the magnetic circuit, causing the induced potential in the coil to change, generating a potential pulse of a certain amplitude and frequency. The frequency of the pulse reflects the speed of wheel rotation. It is a magnetoelectric wheel speed sensor with a simple structure and easy maintenance. Since the front wheel involves steering, the magnetoelectric wheel speed sensor has a strong dynamic measurement capability. It is installed on the front wheel, which is more reliable and safe. The front wheel sensor assembly is installed near the rear wheel hub. The Hall disk that rotates with the rear wheel causes a change in the magnetic field strength to detect the rear wheel speed. The output signal voltage amplitude is not affected by the vehicle speed and has a high frequency response. It is installed on the rear wheel to detect the rear wheel speed more timely.

[0015] The high-precision wheel speed sensor is provided with an air inlet and a plurality of air pipes extending out of the front end of the protective cover. The sensor is installed near the brake disc, and metal debris is easily attached to the front end of the protective cover. When the vehicle is running, high-pressure air enters the hose 7 through the air inlet, and then passes through the through pipe and the air pipe to guide the air to the front end surface of the protective cover, so as to clean the protective cover with air, remove the metal debris, and extend the service life of the wheel speed sensor.

[0016] The high-precision wheel speed sensor is provided with a movable protective shell to protect the wheel speed sensor socket position, which is convenient for disassembly and assembly, and prevents the socket from being damaged by impact caused by gravel and other objects splashed during the driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the front wheel sensor assembly of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the rear wheel sensor assembly of the present invention;

[0019] Figure 3 It is a schematic diagram of the front wheel sensor assembly and the sprocket installation position structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the installation position structure of the rear wheel sensor assembly and the Hall plate of the present invention;

[0021] Figure 5 It is a schematic top view of the front wheel sensor assembly structure of the present invention;

[0022] Figure 6 It is a top plan view of the rear wheel sensor assembly structure of the present invention;

[0023] Figure 7 It is a rear view plan view of the front wheel sensor assembly structure of the present invention;

[0024] Figure 8 It is a schematic diagram of the protective cover structure of the present invention;

[0025] Fig. 9 It is a plan view schematic diagram of the movable protective shell structure of the present invention;

[0026] Fig.10 For the present invention Fig. 9 A schematic diagram of the enlarged structure in the middle.

[0027] In the figure: 1. front wheel sensor assembly; 101. front sensor head; 102. front sensor housing; 103. front mounting frame; 104. toothed disc; 105. front mounting hole; 2. rear wheel sensor assembly; 201. rear sensor head; 202. rear sensor housing; 203. rear mounting frame; 204. Hall plate; 205. rear mounting hole; 3. chip; 4. air pipe; 5. through pipe; 6. protective cover; 7. hose; 8. air inlet; 9. power socket; 10. signal socket; 11. jet nozzle; 12. bracket; 13. screw; 14. slot; 15. block; 16. transmission line group; 17. movable protective shell; 18. plug block; 19. locking block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figures 1 to 10As shown, the high-precision wheel speed sensor of this embodiment includes a front wheel sensor assembly 1 and a rear wheel sensor assembly 2. The front wheel sensor assembly 1 includes a front sensor head 101. The rear end of the front sensor head 101 is provided with a front sensor housing 102. The front end of the front sensor head 101 is provided with a toothed disc 104. The toothed disc 104 is installed near the brake disc or the wheel hub of the front wheel. Then the front wheel sensor assembly 1 is installed near the wheel hub of the front wheel and the differential, so that the air gap between the front sensor head 101 and the toothed disc 104 is 0.2-1.0mm. When the front wheel rotates, the teeth and gaps on the toothed disc 104 pass through the magnetic field of the sensor head 101 in sequence and quickly, changing the magnetic resistance of the magnetic circuit, thereby causing the coil The induced potential changes, generating a potential pulse of a certain amplitude and frequency. The frequency of the pulse reflects the speed of wheel rotation. The rear wheel sensor assembly 2 includes a rear sensor head 201. The rear end of the rear sensor head 201 is provided with a rear sensor housing 202. The front end of the rear sensor head 201 is provided with a Hall plate 204. The Hall plate 204 is installed at the hub position of the rear wheel and rotates synchronously with the rear wheel hub. The rear wheel sensor assembly 2 is installed near the rear wheel hub or the differential, so that the air gap between the rear sensor head 201 and the Hall plate 204 is 0.2-1.5mm. When the rear wheel hub drives the Hall plate 204 to rotate, it will cause a change in the magnetic field strength to detect the rear wheel speed. The front sensor sensor The front sensor head 101 and the rear sensor head 201 are both installed with a chip 3, and the chip 3 is used to record the electromagnetic field change data. The front sensor housing 102 and the rear sensor housing 202 are both provided with a power socket 9. The front sensor housing 102 and the rear sensor housing 202 are both provided with a signal socket 10 near the power socket 9. The power socket 9 and the signal socket 10 can be externally connected to a transmission line group 16, which is electrically connected to the chip 3 to transmit the signal to the vehicle's ABS system for data analysis. The front end of the front sensor head 101 and the rear sensor head 201 are both installed with a protective cover 6, and two brackets 12 are provided on one side of the protective cover 6. An air inlet 8 is hingedly installed between the two brackets 12. The air inlet 8 A hose 7 is provided at one end, a through pipe 5 is provided at one end of the hose 7, and a plurality of air pipes 4 are arranged in an equidistant circular pattern at one end of the through pipe 5. The protective cover 6 protects the front sensor head 101 and the rear sensor head 201. When the vehicle brakes during driving, the brake disc of the vehicle may be worn and small metal debris may appear. Since the sensor is installed close to the brake disc, the metal debris is easily attached to the front end of the protective cover 6. When the vehicle is driving, the opening position of the air inlet 8 faces the front direction of the vehicle. During driving, the wind pressure is relatively large and will enter the hose 7 through the air inlet 8, and then pass through the through pipe 5 and the air pipe 4 to guide the air to the front end surface of the protective cover 6, so as to clean the protective cover 6 and remove the metal debris, thereby extending the service life of the wheel speed sensor.

[0032] Specifically, a front mounting frame 103 is provided at the bottom end of the front sensor housing 102, and a front mounting hole 105 is opened through the bottom of the front mounting frame 103. The front mounting frame 103 installs the front wheel sensor assembly 1 near the wheel hub or brake drum of the front wheel through the front mounting hole 105 to ensure the stability of the installation so that the front wheel sensor assembly 1 can monitor the wheel speed.

[0033] Furthermore, a rear mounting frame 203 is provided at the bottom end of the rear sensor housing 202, and a rear mounting hole 205 is opened through the bottom of the rear mounting frame 203. The rear mounting frame 203 installs the rear wheel sensor assembly 2 near the wheel hub or differential through the rear mounting hole 205 to ensure the stability of the installation, so that the rear wheel sensor assembly 2 can monitor the wheel speed.

[0034] Furthermore, screws 13 are threadedly installed on both sides of the air inlet 8, and one end of the screw 13 extends through the corresponding bracket 12. Since the front wheel speed sensor assembly is installed vertically above the front wheel, the air inlet 8 needs to be adjusted to a perpendicular state with the protective cover 6 so that the opening of the air inlet 8 faces the front of the vehicle. When the vehicle is running at high speed, air will enter the hose 7 through the opening of the air inlet 8. The rear wheel speed sensor assembly is installed on one side of the rear wheel. Therefore, the air inlet 8 needs to be adjusted to a parallel state with the protective cover 6 so that the opening of the air inlet 8 faces the front of the vehicle. When the vehicle is running at high speed, air will enter the hose 7 through the opening of the air inlet 8.

[0035] Furthermore, one end of several air pipes 4 extends out of the front end of the protective cover 6, and a jet port 11 is opened at the extended end of several air pipes 4 toward the middle position of the front end of the protective cover 6. When the through pipe 5 transmits air, the air pipe 4 transports the gas to the position of the jet port 11 for blowing to clean the front end of the protective cover 6.

[0036] Furthermore, the interior of the front sensor housing 102 and the rear sensor housing 202 are both connected to a transmission line group 16, and the outer surface of the transmission line group 16 is connected to a movable protective shell 17. The transmission line group 16 is connected to the power socket 9 and the signal socket 10 to ensure that the electromagnetic signals received by the front wheel speed sensor and the rear wheel speed sensor can be transmitted to the vehicle's ABS system to ensure a rapid response in emergency braking or vehicle skidding to maintain vehicle stability and controllability. The movable protective shell 17 protects the rear ends of the front sensor housing 102 and the rear sensor housing 202 to prevent impact damage to the socket when the vehicle is driving.

[0037] Furthermore, clamping blocks 15 are installed on both sides of the movable protective shell 17, and plug-in blocks 18 are installed on both sides of the front sensor shell 102 and the rear sensor shell 202, to ensure that the movable protective shell 17 can be docked and fitted with the corresponding front sensor shell 102 and the rear sensor shell 202 to ensure the protective effect.

[0038] Furthermore, a slot 14 is provided at one end of the card block 15, a locking block 19 matching the slot 14 is provided at one end of the insert block 18, a spring button is provided at the top of the locking block 19, and a hole matching the spring button is provided at the top of the slot 14. When the locking block 19 is inserted into the slot 14, the spring button coincides with the hole to lock it, thereby ensuring that the movable protective shell 17 will not fall off. When the movable protective shell needs to be opened, the spring button is pressed and the movable protective shell can be pulled to be disassembled.

[0039] The method of using this embodiment is as follows: when installing the wheel speed sensor, install the toothed disc 104 near the brake disc or the wheel hub of the front wheel, and then install the front wheel sensor assembly 1 near the wheel hub of the front wheel and the differential, so that the air gap between the front sensor sensor head 101 and the toothed disc 104 is 0.2-1.0mm. When the front wheel rotates, the teeth and gaps on the toothed disc 104 pass through the magnetic field of the sensor head 101 of the sensor in sequence and quickly, changing the magnetic resistance of the magnetic circuit, thereby causing the induced potential in the coil to change, generating a certain amplitude. The frequency of the electric potential pulse reflects the speed of wheel rotation. The Hall plate 204 is installed at the hub of the rear wheel and rotates synchronously with the rear wheel hub. The rear wheel sensor assembly 2 is installed near the rear wheel hub or the differential, so that the air gap between the rear sensor head 201 and the Hall plate 204 is 0.2-1.5mm. When the rear wheel hub drives the Hall plate 204 to rotate, it will cause a change in the magnetic field strength to detect the rear wheel speed. The front wheel sensor assembly 1 and the rear wheel sensor assembly 2 are connected to the transmission The wire group 16 transmits the signal to the automobile ABS system through the chip 3 for data analysis. When the transmission wire group 16 is installed, the movable protective shell 17 protects the rear ends of the front sensor housing 102 and the rear sensor housing 202. The top of the slot 14 is provided with a hole matching the spring button, and when the locking block 19 is inserted into the slot 14, the spring button overlaps with the hole to lock it, thereby ensuring that the movable protective shell 17 will not fall off, and avoiding impact and damage to the socket when the vehicle is driving. When the vehicle brakes during driving, the brake disc of the vehicle may be worn and small metal debris may appear. Since the sensor is installed near the brake disc, the metal debris is very easy to adhere to the front end of the protective cover 6. When the vehicle is driving, the opening position of the air inlet 8 faces the direction of the front of the vehicle. During driving, the wind pressure is relatively large, and it will enter the hose 7 through the air inlet 8, and then through the through pipe 5 and the air pipe 4. The jet port 11 opened at the front end of the air pipe 4 guides the air to the front end surface of the protective cover 6, and the protective cover 6 is cleaned with air to remove the metal debris, thereby extending the service life of the wheel speed sensor.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-precision wheel speed sensor, comprising a front wheel sensor assembly (1) and a rear wheel sensor assembly (2), characterized in that: The front wheel sensor assembly (1) comprises a front sensor head (101), a front sensor housing (102) is provided at the rear end of the front sensor head (101), and a toothed disc (104) is provided at the front end of the front sensor head (101); the rear wheel sensor assembly (2) comprises a rear sensor head (201), a rear sensor housing (202) is provided at the rear end of the rear sensor head (201), and a Hall plate (204) is provided at the front end of the rear sensor head (201); a chip (3) is installed inside the front sensor head (101) and the rear sensor head (201); a power socket (9) is provided inside the front sensor housing (102) and the rear sensor housing (202); and the front sensor housing (102) and the rear sensor housing (202) are connected to the front sensor head (201). A signal socket (10) is provided inside the housing (202) near the power socket (9); a protective cover (6) is installed at the front end of the front sensor head (101) and the rear sensor head (201); two brackets (12) are provided on one side of the protective cover (6); an air inlet (8) is hingedly installed between the two brackets (12); a hose (7) is provided at one end of the air inlet (8); a through pipe (5) is provided at one end of the hose (7); a plurality of air pipes (4) are equidistantly arranged in a circular pattern at one end of the through pipe (5); the opening position of the air inlet (8) faces the direction of the front of the vehicle; one end of the plurality of air pipes (4) extends out of the front end of the protective cover (6); and a plurality of air pipes (4) are provided with jet nozzles (11) at the extended ends facing the middle position of the front end of the protective cover (6).

2. The high-precision wheel speed sensor according to claim 1, characterized in that: A front mounting frame (103) is provided at the bottom end of the front sensor housing (102), and a front mounting hole (105) is provided through the bottom of the front mounting frame (103).

3. The high-precision wheel speed sensor according to claim 1, characterized in that: A rear mounting frame (203) is provided at the bottom end of the rear sensor housing (202), and a rear mounting hole (205) is provided through the bottom of the rear mounting frame (203).

4. The high-precision wheel speed sensor according to claim 1, characterized in that: Screws (13) are threadedly mounted on both sides of the air inlet (8), and one end of the screw (13) extends through the corresponding bracket (12).

5. The high-precision wheel speed sensor according to claim 1, characterized in that: The interiors of the front sensor housing (102) and the rear sensor housing (202) are both connected to a transmission line group (16), and the outer surfaces of the transmission line groups (16) are both connected to a movable protective shell (17).

6. The high-precision wheel speed sensor according to claim 5, characterized in that: Blocks (15) are installed on both sides of the movable protective shell (17), and plug blocks (18) are installed on both sides of the front sensor shell (102) and the rear sensor shell (202).

7. The high-precision wheel speed sensor according to claim 6, characterized in that: One end of the card block (15) is provided with a slot (14), and one end of the insert block (18) is provided with a locking block (19) matching the slot (14).

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