Method for detecting signal-to-noise ratio attenuation of vehicle bumper to millimeter-wave radar

Abstract

The invention provides a method for detecting signal-to-noise ratio attenuation of a millimeter-wave radar by a bumper of a vehicle, the millimeter-wave radar is arranged on the vehicle, and the method comprises the following steps: compiling a test routine for signal-to-noise ratio detection in the millimeter-wave radar; a corner reflector is arranged, the corner reflector and the millimeter-wave radar are spaced by a preset distance, and when the bumper is installed on the vehicle, the bumper is located between the corner reflector and the millimeter-wave radar; controlling the millimeter wave radar to execute a test routine in the direction of the corner reflector to obtain a first signal-to-noise ratio; mounting a bumper on the vehicle, and then controlling the millimeter-wave radar to execute the test routine again towards the direction of the corner reflector to obtain a second signal-to-noise ratio; and determining signal-to-noise ratio attenuation of the bumper to the millimeter wave radar based on a difference value between the first signal-to-noise ratio and the second signal-to-noise ratio.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method for detecting attenuation of millimeter-wave radar signal-to-noise ratio caused by a vehicle bumper. Background Art

[0002] Millimeter-wave radar, with its excellent detection performance for moving objects, plays a crucial role in active safety and intelligent driving, and its installation rate is increasing year by year. Millimeter-wave radars are typically mounted on the inside of front and rear bumpers or on the bodywork. In either case, the bumper blocks the millimeter-wave radar. Under normal circumstances, the bumper's attenuation of millimeter-wave radar detection performance (signal-to-noise ratio) should be less than 5dB. Otherwise, the radar's detection performance will be weakened, affecting both the number of objects detected and its accuracy. The bumper's shape (whether the millimeter-wave radar's projection on the bumper is smooth) and the paint properties (paint thickness and metal content) can affect the millimeter-wave radar's signal-to-noise ratio. Before a vehicle leaves the factory, the vehicle manufacturer can ensure that the bumper's impact on the millimeter-wave radar's signal-to-noise ratio is less than 5dB through 100% inspection with dedicated equipment (worth more than 1 million yuan). However, after the vehicle leaves the factory, if an accident occurs and repairs are required, uneven polishing of the bumper base or excessive paint spraying will cause the bumper's signal-to-noise ratio to be attenuated by more than 5dB, resulting in reduced millimeter-wave radar performance and limited functionality, which in turn affects the vehicle's driving safety.

[0003] In the related art, each 4S shop can be equipped with dedicated equipment to test the attenuation value of the bumper to the millimeter wave radar signal-to-noise ratio. However, the dedicated equipment is very expensive and bulky, making it inconvenient to use. Summary of the Invention

[0004] To at least partially address the above-mentioned problems, an embodiment of the present application provides a method for detecting the attenuation of a vehicle's bumper's signal-to-noise ratio with respect to a millimeter-wave radar. The millimeter-wave radar is disposed on the vehicle, and the method comprises: compiling a test routine for performing signal-to-noise ratio detection in the millimeter-wave radar; providing a corner reflector, and separating the corner reflector from the millimeter-wave radar by a preset distance, so that when the bumper is installed on the vehicle, the bumper is located between the corner reflector and the millimeter-wave radar; controlling the millimeter-wave radar to execute the test routine in the direction of the corner reflector to obtain a first signal-to-noise ratio; installing the bumper on the vehicle, and then controlling the millimeter-wave radar to execute the test routine again in the direction of the corner reflector to obtain a second signal-to-noise ratio; and determining the attenuation of the millimeter-wave radar's signal-to-noise ratio with respect to the bumper based on the difference between the first signal-to-noise ratio and the second signal-to-noise ratio.

[0005] In some embodiments, the method further includes: determining that the bumper meets repair requirements based on the difference being less than a preset threshold.

[0006] In some embodiments, the preset threshold is 5db.

[0007] In some embodiments, based on the difference being greater than or equal to a preset threshold, the bumper is reworked until the difference is less than the preset threshold.

[0008] In some embodiments, the corner reflector is fixed by a bracket, and the height of the corner reflector on the bracket is the same as the height of the millimeter wave radar on the vehicle.

[0009] In some embodiments, the distance between the corner reflector and the millimeter wave radar is 1.9 to 2.1 meters.

[0010] In some embodiments, when the millimeter-wave radar is controlled to execute a test routine in the direction of the corner reflector, there is no object interference within a range of 1.45 to 1.55 meters around the corner reflector.

[0011] In some embodiments, when the millimeter-wave radar is controlled to execute the test routine in the direction of the corner reflector, there is no object blocking the corner reflector and the millimeter-wave radar except the bumper.

[0012] In some embodiments, communication is established between the vehicle fault diagnosis instrument and the millimeter-wave radar to control the millimeter-wave radar to execute a test routine in the direction of the corner reflector.

[0013] The method provided in the embodiments of the present application for detecting the attenuation of the millimeter-wave radar signal-to-noise ratio caused by a vehicle bumper only utilizes simple tools such as corner reflectors, fully utilizing the radar's own signal-to-noise ratio measurement capability to measure the impact of the bumper on the radar signal-to-noise ratio, and solving the problem with relatively small investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 is a schematic diagram of a corner reflector provided in an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of a corner reflector provided in an embodiment of the present application installed on a bracket.

[0017] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions of the preferred embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection claimed in this application.

[0019] The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "include" or "comprises" mean that the elements preceding the term encompass the elements listed after the term, and do not exclude the possibility of also encompassing other elements. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0020] Combine Figure 1 and Figure 2 An embodiment of the present application provides a method for detecting the attenuation of a vehicle's bumper's signal-to-noise ratio to a millimeter-wave radar. The millimeter-wave radar is installed on the vehicle and can detect objects for active safety and intelligent driving. The method includes: compiling a test routine for signal-to-noise ratio detection in the millimeter-wave radar; setting a corner reflector and separating the corner reflector from the millimeter-wave radar by a preset distance. When the bumper is installed on the vehicle, the bumper is located between the corner reflector and the millimeter-wave radar; controlling the millimeter-wave radar to execute the test routine in the direction of the corner reflector to obtain a first signal-to-noise ratio; installing the bumper on the vehicle, and then controlling the millimeter-wave radar to execute the test routine again in the direction of the corner reflector to obtain a second signal-to-noise ratio; and determining the attenuation of the bumper's signal-to-noise ratio to the millimeter-wave radar based on the difference between the first signal-to-noise ratio and the second signal-to-noise ratio. The test routine can be preset in the millimeter-wave radar through software programming. For example, a test routine based on UDS can be developed in advance.

[0021] The method provided in the embodiments of the present application for detecting the attenuation of the millimeter-wave radar signal-to-noise ratio caused by a vehicle bumper only utilizes simple tools such as corner reflectors, fully utilizing the radar's own signal-to-noise ratio measurement capability to measure the impact of the bumper on the radar signal-to-noise ratio, and solving the problem with relatively small investment.

[0022] In some embodiments, the method further includes: determining that the bumper meets the repair requirements based on the difference being less than a preset threshold. In some embodiments, the preset threshold may be 5db. The method provided in the embodiments of the present application can be mainly used in scenarios where a vehicle needs repair after leaving the factory due to an accident, to verify whether the repair quality of the bumper meets the repair requirements. In some embodiments, based on the difference being greater than or equal to a preset threshold, the bumper is re-repaired until the difference is less than the preset threshold. In this way, it is ensured that the repaired bumper can meet the signal-to-noise ratio attenuation requirements of the millimeter-wave radar, thereby ensuring the accuracy and safety of the millimeter-wave radar.

[0023] Combine Figure 2 In some embodiments, the corner reflector is fixed by a bracket, and the height of the corner reflector on the bracket is the same as the height of the millimeter-wave radar on the vehicle. In some embodiments, the distance between the corner reflector and the millimeter-wave radar is 1.9 to 2.1 meters. Preferably, the distance between the corner reflector and the millimeter-wave radar is 2 meters. In some embodiments, when the millimeter-wave radar is controlled to perform a test routine in the direction of the corner reflector, there is no object interference within a range of 1.45 to 1.55 meters around the corner reflector. In some embodiments, when the millimeter-wave radar is controlled to perform a test routine in the direction of the corner reflector, there is no object blocking the corner reflector and the millimeter-wave radar except the bumper. The operating method in the above embodiment can make the measurement results more accurate.

[0024] In some embodiments, a vehicle diagnostic instrument establishes communication with the millimeter-wave radar to control the millimeter-wave radar to execute a test routine in the direction of the corner reflector. Vehicle diagnostic instruments are often essential tools for 4S dealerships. In this embodiment, simple communication with the instrument can trigger the radar's corresponding routine, thereby completing the test. The following table illustrates exemplary communication methods between the vehicle diagnostic instrument and the millimeter-wave radar.

[0025] step Request command (sent by the diagnostic instrument) describe Response command (radar reply) 1 10 03 Enter the expansion session 50 03 2 27 01 Secure access (request seed) 67 01 3 27 02 Secure access (reply key) 67 02 4 31 01 38 08 01 Radar signal-to-noise ratio detection without bumper 71 01 38 08 XX 5 31 01 38 08 02 When there is a bumper, the radar's signal-to-noise ratio detection 71 01 38 08 XX

[0026] The method for detecting attenuation of millimeter-wave radar signal-to-noise ratio due to a vehicle bumper provided in the embodiments of the present application can be performed according to the following steps in actual operation:

[0027] 1. Place the corner reflector 2 meters behind the millimeter-wave radar, ensuring that the corner reflector is at the same height as the millimeter-wave radar. Ensure that there are no objects within 1.5 meters of the corner reflector, and that there are no objects blocking the millimeter-wave radar and the corner reflector.

[0028] 2. When only the millimeter-wave radar is installed without the bumper, send a test command to the millimeter-wave radar through the vehicle fault diagnosis instrument to test the corner reflector signal-to-noise ratio.

[0029] 3. After installing the bumper, send a test command to the millimeter-wave radar again through the vehicle fault diagnosis instrument to test the corner reflector signal-to-noise ratio.

[0030] 4. Record the signal-to-noise ratio difference returned by the millimeter-wave radar and compare it with the upper limit of 5db. If it is less than 5db, it means that the bumper meets the requirements and can be used normally. If it is greater than 5db, it needs to be repaired until the test result is less than 5db.

[0031] The embodiments of the present application provide a method for detecting the attenuation of a vehicle's bumper's millimeter-wave radar signal-to-noise ratio. This method does not require the addition of expensive testing equipment and can be completed using only a reflector and a bracket (valued at less than RMB 200). This method fully utilizes the radar's inherent signal-to-noise ratio measurement capability to measure the bumper's impact on the radar's signal-to-noise ratio, solving the problem with minimal investment.

[0032] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0033] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present application. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for detecting the attenuation of the signal-to-noise ratio of a millimeter-wave radar by a bumper of a vehicle, wherein the millimeter-wave radar is arranged on the vehicle, characterized in that: include: Compiling a test routine for performing signal-to-noise ratio detection in the millimeter-wave radar; A corner reflector is provided, and the corner reflector is spaced apart from the millimeter-wave radar by a preset distance, and when the bumper is installed on the vehicle, the bumper is located between the corner reflector and the millimeter-wave radar; Controlling the millimeter wave radar to execute the test routine in the direction of the corner reflector to obtain a first signal-to-noise ratio; Installing the bumper on the vehicle, and then controlling the millimeter-wave radar to execute the test routine again in the direction of the corner reflector to obtain a second signal-to-noise ratio; The signal-to-noise ratio attenuation of the millimeter-wave radar by the bumper is determined based on a difference between the first signal-to-noise ratio and the second signal-to-noise ratio.

2. The method according to claim 1, characterized in that Also includes: Based on the difference being less than a preset threshold, it is determined that the bumper meets maintenance requirements.

3. The method according to claim 2, characterized in that The preset threshold is 5db.

4. The method according to claim 2, characterized in that: Based on the difference being greater than or equal to the preset threshold, the bumper is re-repaired until the difference is less than the preset threshold.

5. The method according to claim 1, characterized in that The corner reflector is fixed by a bracket, and the height of the corner reflector on the bracket is the same as the height of the millimeter wave radar on the vehicle.

6. The method according to claim 1, characterized in that The distance between the corner reflector and the millimeter wave radar is 1.9 to 2.1 meters.

7. The method according to claim 6, characterized in that When the millimeter-wave radar is controlled to execute the test routine in the direction of the corner reflector, there is no object interference within a range of 1.45 to 1.55 meters around the corner reflector.

8. The method according to claim 6, characterized in that When the millimeter-wave radar is controlled to execute the test routine in the direction of the corner reflector, there is no object blocking the corner reflector and the millimeter-wave radar except the bumper.

9. The method according to claim 2, characterized in that: The automobile fault diagnosis instrument establishes communication with the millimeter-wave radar to control the millimeter-wave radar to execute the test routine in the direction of the corner reflector.

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