Anti-interference wheel speed sensor

Abstract

The utility model relates to the technical field of automobile sensors. The anti-interference wheel speed sensor comprises a sensor body, the end face of the head end of the sensor body is in a spherical shape protruding outwards, a plurality of dust removal channels are evenly arranged on the circumferential face, close to the head end, of the sensor body, and the dust removal channels obliquely extend from the circumferential face of the sensor body to the end face of the head end. According to the utility model, the risk that scrap iron is accumulated at the head end of the sensor main body can be obviously reduced, and the anti-interference effect of the sensor is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive sensor technology, specifically to an anti-interference wheel speed sensor. Background Technology

[0002] Wheel speed sensors are key components of vehicle electronic control systems. They collect wheel speed data (such as revolutions per minute, angular velocity, etc.) in real time by sensing the rotation of the gear ring (or trigger impeller). Generally, each wheel is equipped with a separate sensor (some models share the front or rear wheels) to ensure independent monitoring of the motion status of each wheel.

[0003] It can provide data support for active safety systems, such as: ABS (Anti-lock Braking System): If a wheel is about to lock up during braking (sudden drop in speed), the sensor immediately sends a signal, and the system adjusts the braking pressure to prevent the tire from locking up and maintain steering ability. ESP (Electronic Stability Program): Monitors the speed difference between the wheels to determine if the vehicle is skidding or out of control, and stabilizes the vehicle by braking a single wheel or adjusting power output. TCS (Traction Control System): When starting or accelerating, if the drive wheels slip (speed higher than the non-drive wheels), the system will limit power output or brake the slipping wheel to restore traction.

[0004] In recent years, with the rapid development of driver assistance systems, support has been provided for driver assistance and comfort functions, such as: Automatic transmission control: combining wheel speed and engine speed to optimize shift timing and logic, improving smoothness and fuel economy. Cruise control and speedometer: directly providing vehicle speed signals to the cruise control system, while driving the speedometer pointer or digital display on the instrument panel. As a "bridge" connecting mechanical motion and electronic control, its accuracy directly affects braking safety, handling stability, and driving experience. Sensor malfunctions (such as signal interference or loose installation) may lead to problems such as ABS failure and abnormal fuel consumption.

[0005] Wheel speed sensors are installed near the vehicle's brake discs. Over long-term use, due to brake pad wear, metal shavings can easily accumulate on the head of the sensor body. Figure 1 As shown in the diagram, point A represents accumulated iron filings. Whether it's an electromagnetic sensor or a Hall effect sensor, accumulated iron filings can easily lead to changes in magnetic flux (electromagnetic type) or block the magnetic field of the permanent magnet (Hall effect type), causing sensor malfunction and affecting driving safety and the driving experience. Therefore, how to prevent iron filings from accumulating in a simple way is a crucial issue. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-interference wheel speed sensor that can reduce the accumulation of iron filings.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is: an anti-interference wheel speed sensor, comprising a sensor body, wherein the end face of the head end of the sensor body is a spherical shape protruding outward, and multiple dust removal channels are uniformly arranged on the circumferential surface near the head end, wherein the dust removal channels extend obliquely from the circumferential surface of the sensor body toward the end face of the head end.

[0008] Preferably, the number of dust removal tunnels is four.

[0009] Preferably, the number of dust removal tunnels is eight.

[0010] Preferably, the dust removal tunnel has rounded chamfers at both corners.

[0011] Preferably, a ring groove is provided on the circumference of the sensor body near the end of the dust removal tunnel, and the ring groove is connected to the end of the dust removal tunnel.

[0012] Preferably, an arc-shaped air guide plate is provided in the annular groove at the position corresponding to the dust removal channel to guide the airflow into the dust removal channel.

[0013] The beneficial effects of this invention are mainly reflected in its ability to significantly reduce the risk of iron filings accumulating at the tip of the sensor body and improve the sensor's anti-interference performance. Specifically, during use, when the vehicle is moving, airflow passes over the tip of the spherical sensor body. The airflow velocity at the tip is faster than in other parts of the sensor body, creating a low-pressure zone. The airflow flows from the periphery of the sensor body towards the tip, providing a certain scouring effect and preventing iron filings from depositing. The dust removal channel guides the airflow, enhancing the scouring effect and further reducing the risk of deposition. Compared to traditional flat-head sensor bodies, this invention has a lower overall risk of iron filings deposition, reducing the failure rate during long-term use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an existing wheel speed sensor;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model;

[0016] Figure 3 for Figure 2 The left view;

[0017] Figure 4 for Figure 3 A schematic diagram of a preferred embodiment of the structure shown in the figure;

[0018] Figure 5 for Figure 2 A schematic diagram of another preferred embodiment of the structure shown is presented. Detailed Implementation

[0019] like Figure 2-5 As shown, wheel speed sensors are installed at each wheel of the vehicle to detect wheel speed. They reduce the risk of brake pad wear and metal shavings buildup, and have strong anti-interference capabilities. Figure 2 As shown, this utility model includes a sensor body 1, which is mounted on the steering knuckle of the vehicle via a connecting piece on the side. Generally, the sensor body 1 is connected to various control modules, such as ABS, ESP, and TCU (Automatic Transmission Control Unit), via connecting wires.

[0020] The most significant difference in this invention lies in the fact that the end face of the sensor body 1 at its head end 0 is a spherical shape protruding outwards, and multiple dust removal channels 2 are evenly arranged on the circumferential surface near the head end 0, such as... Figure 3 and 4 As shown, four or eight channels are typically set, such as... Figure 2 As shown, the dust removal tunnel 2 extends obliquely from the circumferential surface of the sensor body 1 toward the end face of the head end 0.

[0021] During use, when the vehicle is moving, airflow passes over the end 0 of the spherical sensor body 1. The airflow velocity at end 0 is faster than at other parts of the sensor body 1, creating a low-pressure zone at end 0. The airflow flows from the periphery of the sensor body 1 towards end 0, providing a certain scouring effect and preventing iron filings from accumulating at the end. The dust removal channel 2 guides the airflow, enhancing the scouring effect and further reducing the risk of deposition. Compared to traditional flat-head sensor bodies, this invention has a lower overall risk of iron filings deposition, reducing the failure rate over long-term use.

[0022] To improve the airflow guiding performance of the dust collection duct 2, this invention can provide arc-shaped chamfers 3 at both corners of the dust collection duct 2 to reduce the occurrence of airflow dead zones and further improve the smoothness of airflow. In addition, this invention can also provide a chamfer 3 near the end of the dust collection duct 2 on the sensor body 1 (i.e.,...). Figure 2 A ring groove 4 is provided on the circumference of the right end of the dust removal tunnel 2. The ring groove 4 is connected to the tail end of the dust removal tunnel 2. The design of the ring groove 4 can increase the air intake at the tail end of the dust removal tunnel 2, thereby increasing the flow rate of the flushing airflow. At the same time, the present invention can also provide an arc-shaped air guide plate 5 in the ring groove 4 corresponding to the position of the dust removal tunnel 2 to guide the airflow into the dust removal tunnel 2, so as to further increase the flow rate of the flushing airflow.

Claims

1. An interference-immune wheel speed sensor, characterized by: The sensor body (1) has a head end (0) with an outwardly protruding spherical end face and multiple dust removal channels (2) are evenly arranged on the circumferential surface near the head end (0). The dust removal channels (2) extend obliquely from the circumferential surface of the sensor body (1) toward the head end (0) end face.

2. The tamper-resistant wheel speed sensor of claim 1, wherein: The number of dust removal passages (2) is four.

3. The tamper-resistant wheel speed sensor of claim 1, wherein: The number of dust removal passages (2) is eight.

4. The tamper-resistant wheel speed sensor of claim 1, wherein: The dust removal tunnel (2) has rounded chamfers (3) on both sides.

5. The tamper-resistant wheel speed sensor of claim 1, wherein: The sensor body (1) has a ring groove (4) on its circumference near the end of the dust removal tunnel (2), and the ring groove (4) is connected to the end of the dust removal tunnel (2).

6. The tamper-resistant wheel speed sensor of claim 5, wherein: An arc-shaped air guide plate (5) is provided in the annular groove (4) at the position corresponding to the dust removal channel (2) to guide the airflow into the dust removal channel (2).

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