Ultrasonic radar system silicon microphone sensor installation method and installation device

Abstract

The invention discloses an ultrasonic radar system silicon microphone sensor mounting method and device, and the method comprises the steps: enabling a sound input hole of a silicon microphone sensor to be communicated with an opening of a protection rod, enabling the opening of the protection rod to be inclined relative to the horizontal direction, and / or enabling a waterproof breathable film to be disposed at the outer side of the opening of the protection rod. The problem that the detection function of the silicon microphone sensor fails or the performance of the silicon microphone sensor is reduced due to the fact that the hole of the protection rod is blocked by water or mud can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ultrasonic technology, in particular to a method and device for installing a silicon microphone sensor of an ultrasonic radar system. BACKGROUND

[0002] The ultrasonic radar sensor for vehicles is installed in an aluminum shell to achieve receiving and transmitting functions and waterproofing.

[0003] Referring to Figure 1 The ultrasonic radar sensor, referred to as an ultrasonic sensor 10, includes a ceramic sheet 11 arranged in an aluminum shell 12 and fixed by waterproof glue 13. The working principle of the ultrasonic sensor is to apply an alternating voltage pulse (such as 51 KHz, 58 KHz, etc.) to the ceramic sheet 11, which causes mechanical deformation of the ceramic sheet 11, and the aluminum shell in close contact with the ceramic sheet deforms, and the aluminum shell 12 drives the surrounding air to deform and transmit signals to the air. When the deformed air encounters an obstacle 20, it is reflected back to the surface of the aluminum shell 12, causing the aluminum shell 12 to deform slightly and the ceramic sheet 11 to deform mechanically to generate a small voltage signal. The voltage signal is amplified and processed by a DSP to identify the obstacle signal and its distance, direction, etc., thereby achieving the ultrasonic sensor detection function.

[0004] To achieve better transmitting power and receiving sensitivity, referring to Figure 2 Generally, a hole is opened in the retaining rod 30 to expose the aluminum shell of the ultrasonic sensor to the air, which has the following disadvantages:

[0005] Disadvantage 1: If the retaining rod needs to be opened, the retaining rod manufacturer needs to open a punching die, which is not cheap and will also increase the cost of punching time;

[0006] Disadvantage 2: The retaining rod of the car is generally the same color as the car body. The car body is painted in a certain color, and the retaining rod is also painted in the same color. Since the ultrasonic sensor is attached to the retaining rod, the surface of the ultrasonic sensor aluminum shell also needs to be painted in the same color as the retaining rod, i.e. the ultrasonic sensor also needs to be painted, resulting in an increase in the cost of the ultrasonic sensor;

[0007] Disadvantage 3: Because the retaining rod needs to be opened, there will be a gap between the ultrasonic sensor and the retaining rod, which will make the appearance of the retaining rod not as good as when there is no opening;

[0008] Disadvantage 4: The horizontal angle of the existing ultrasonic sensor is generally only about 120 degrees. To achieve the detection of the surrounding of the vehicle, 12 sensors are generally installed in the system, resulting in a high system cost;

[0009] Deficiency 5: In order to meet the requirements of vehicle use (such as waterproofing requirements), the existing ultrasonic sensor adopts a transceiver integrated body, and the maximum detection distance is only about 5 meters.

[0010] In order to solve the above deficiencies, a silicon microphone sensor is generally introduced to solve the problem, but the silicon microphone sensor has a sound input hole on the surface, which is generally installed on the guard rod in the following way Figure 3 .

[0011] Referring to Figure 3 , the silicon microphone sensor 40 is attached to the PCBA 50, and the silicon microphone sensor 40 has a sound input hole 41 on the surface, which is connected to the waterproof and breathable film 60 attached to the inner side of the guard rod through a sound guide pipe 42, and the hole of the sound guide pipe 42 is opposite to the opening 31 on the guard rod 30, which is a parallel hole (see Figure 4 for reference). The signal reflected by the obstacle passes through the opening 31 on the guard rod, penetrates through the waterproof and breathable film 60, and then passes through the sound guide pipe 42 and the sound input hole 41 to enter the silicon microphone sensor 40 for identification.

[0012] The above is the application of the silicon microphone sensor in the ultrasonic radar system, and from the working process, the following deficiencies can be seen:

[0013] The hole opened by the guard rod for the silicon microphone sensor is about 1 cm in diameter, which is a parallel opening, as shown in Figure 4 . And it is exposed outside the guard rod, so when it rains, washes the car, or passes through the muddy road, the hole opened on the guard rod is easy to be blocked by water or mud, causing functional failure or performance decline, and some methods are needed to solve or alleviate this deficiency. SUMMARY

[0014] Therefore, in order to solve the above technical problems, the purpose of the present application is to provide a silicon microphone sensor installation method and installation device for an ultrasonic radar system, which can reduce or solve the problem of the opening of the guard rod being blocked by water or mud.

[0015] The technical scheme adopted is:

[0016] The silicon microphone sensor installation method of the present application, the installation method comprises making the sound input hole of the silicon microphone sensor communicate with the opening of the guard rod, and making the opening of the guard rod be inclined relative to the horizontal direction, and / or arranging a waterproof and breathable film outside the opening of the guard rod.

[0017] The application discloses an ultrasonic radar system silicon microphone sensor mounting device, which is characterized by comprising a protecting rod, a silicon microphone sensor and a waterproof and breathable film.

[0018] Further, the opening is a slant hole, and an axis of the slant hole is arranged to be inclined to a horizontal plane at an acute angle, so that an opening direction of the slant hole is inclined to the ground.

[0019] Further, the opening is a half moon hole, a hole diameter radius of the half moon hole on an inner side of the protecting rod is r, and a hole on an outer side of the protecting rod is composed of a half circle with a radius of r on an upper part and a half circle with a radius of R on a lower part, wherein R>r, and a hole opening of the half circle on the lower part is inclined to the ground.

[0020] Further, the protecting rod is not bored, the silicon microphone sensor is located below the ultrasonic sensor, and a sound input hole of the silicon microphone sensor is directed to a lower inner side of the protecting rod.

[0021] The application has the following beneficial effects:

[0022] The mounting method of the application comprises the following steps: making a sound input hole of the silicon microphone sensor communicate with an opening of the protecting rod, and making the opening of the protecting rod be arranged to be inclined to a horizontal direction, and / or arranging the waterproof and breathable film on an outer side of the opening of the protecting rod, so that the problem that the opening of the protecting rod is blocked by water or mud is reduced or solved by changing the opening mode of the protecting rod or the mounting position of the waterproof and breathable film, and the problem that the silicon microphone sensor fails to detect or has a reduced performance due to the opening of the protecting rod being blocked by water or mud is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the application, the drawings needed to be used in the background and the specific embodiments will be briefly introduced below, and the drawings in the description are only for the convenience of technical understanding, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0024] Figure 1 It is a schematic diagram of the working principle of the ultrasonic sensor in the background.

[0025] Figure 2 It is a schematic diagram of the mounting structure of the ultrasonic sensor in the background.

[0026] Figure 3 It is a schematic diagram of the structure in which the silicon microphone sensor and the ultrasonic sensor are mounted in the background.

[0027] Figure 4 Structure diagram of the opening of the guard pole in the background technology is a parallel hole structure.

[0028] Figure 5 Structure diagram of the opening of the guard pole in Example 1 is a slant hole.

[0029] Figure 6 Side view diagram of the opening of the guard pole in Example 2 is a half moon hole.

[0030] Figure 7 Front view diagram of the opening of the guard pole in Example 2 is a half moon hole.

[0031] Figure 8 Structure diagram of the installation of the silicon microphone sensor and the ultrasonic sensor in Example 3.

[0032] Figure 9 Structure diagram of the waterproof and breathable film attached to the outer side of the guard pole and covering the opening in Example 3.

[0033] Figure 10 Structure diagram of the guard pole without opening in Example 4, and the silicon microphone sensor is located below the ultrasonic sensor. DETAILED DESCRIPTION

[0034] The application will be described in detail below through specific examples, but the purpose and purpose of these exemplary embodiments are only used to exemplify the application, and do not constitute any form of any limitation on the actual protection scope of the application, and do not limit the protection scope of the application.

[0035] Example 1

[0036] The silicon microphone sensor installation method of the ultrasonic radar system of the present embodiment comprises that the sound input hole of the silicon microphone sensor is communicated with the opening of the guard pole, and the opening of the guard pole is inclined relative to the horizontal direction.

[0037] The silicon microphone sensor installation device of the ultrasonic radar system realized according to the installation method comprises a guard pole, a silicon microphone sensor and a waterproof and breathable film; the guard pole is provided with an opening for conducting ultrasonic waves, the silicon microphone sensor is communicated with the opening on the guard pole through a sound guide pipe, and the passage of the opening is inclined relative to the horizontal direction.

[0038] Specifically, the opening of the guard pole of the present embodiment is a slant hole, the axis of the slant hole forms an acute angle with the horizontal plane, so that the opening direction of the slant hole is inclined towards the ground.

[0039] Combination and comparison Figure 4 The opening of the guard pole is a parallel hole. Referring to Figure 5 Because the slant hole is inclined downward to the ground, if the slant hole has water or mud, compared withFigure 4 the inclined hole, if the water or mud cannot flow out or fall off, the system will remind the driver to clean the water or mud in the inclined hole in time when the system diagnoses that the inclined hole is blocked. Since the inclined hole is inclined downward, the water or mud is easy to flow out or fall off from the hole when the hole is cleaned with a small and sharp object, or the water or mud is easy to flow out or fall off from the inclined hole when the guard rod is tapped by hand.

[0040] Embodiment 2

[0041] Referring to Embodiment 1, the inclined hole of Embodiment 1 is inclined, and the inclined hole can have a top edge with a burr. This embodiment is different from Embodiment 1 in that, as shown in Figure 6 and Figure 7 , a half-moon form is adopted. That is, the hole is a half-moon shaped hole, the hole diameter radius of the inside of the guard rod is r, and the hole on the outside of the guard rod is composed of a half circle with a radius of r on the top and a half circle with a radius of R on the bottom, where R>r, and the hole opening of the bottom half circle is inclined toward the ground.

[0042] As shown in Figure 6 and Figure 7 , the hole diameter radius of the inside of the guard rod is r, the radius of the upper half hole on the outside is r, and the radius of the lower half hole is R, where R>r, so that the phenomenon of burr on the hole is avoided, and the lower half hole is inclined downward, which is beneficial to the water or mud flowing out or falling off from the lower half hole.

[0043] Embodiment 3

[0044] The silicon microphone sensor mounting method of the ultrasonic radar system of this embodiment is to arrange a waterproof and breathable film on the outside of the hole of the guard rod.

[0045] The silicon microphone sensor mounting device of the ultrasonic radar system realized according to the mounting method comprises a guard rod, a silicon microphone sensor, and a waterproof and breathable film. The guard rod is provided with a hole for conducting ultrasonic waves, the silicon microphone sensor is connected in communication with the hole on the guard rod through a sound guide pipe, and the waterproof and breathable film is attached to the outside of the guard rod and covers the hole.

[0046] As shown in Figure 3 , the waterproof and breathable film is attached to the inside of the guard rod; as shown in Figure 8-9 , the waterproof and breathable film of this embodiment is attached to the outside of the guard rod and covers the hole, which can effectively avoid the condition of being blocked by water or mud. Since the waterproof and breathable film is exposed on the outside of the guard rod, a waterproof and breathable film with good sun protection, wear resistance, and anti-falling properties needs to be selected, and the size of the selected waterproof and breathable film needs to be selected according to the principle of attaching to the hole and not falling off.

[0047] Embodiment 4

[0048] As an alternative, the ultrasonic radar system silicon microphone sensor mounting device of the present embodiment does not have a hole in the guard rod, and the silicon microphone sensor is located below the ultrasonic sensor, with the sound input hole of the silicon microphone sensor facing the inside of the guard rod. The present embodiment uses the diffraction effect of ultrasonic waves to receive the ultrasonic signals reflected from obstacles.

[0049] Referring to Figure 10 As shown, to prevent the hole in the guard rod from being blocked by water or mud, and considering that sound signals can be diffracted, the present embodiment opens the sound input hole of the silicon microphone sensor on the inside of the guard rod, below the ultrasonic sensor. In this way, when the ultrasonic sensor transmits ultrasonic signals that are reflected by obstacles, in addition to returning to the front of the guard rod, they will also be diffracted to the inside of the guard rod and received by the silicon microphone sensor. Although the received signals are attenuated to some extent due to diffraction, this effectively solves the problem of the silicon microphone sensor losing its detection function or performance degradation due to the hole in the guard rod being blocked by water or mud when it rains, when the car is washed, or when the car is driven on a muddy road.

[0050] It should be noted that the embodiment 1 or embodiment 2 can be combined with embodiment 3 to form a new embodiment, which is also within the protection scope of the present application.

[0051] The above series of detailed descriptions are merely specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. An ultrasonic wave radar system silicon microphone sensor mounting method, characterized by, The installation method comprises: making the sound input hole of the silicon microphone sensor communicate with the opening of the guard rod, and making the opening of the guard rod be arranged obliquely relative to the horizontal direction, and / or arranging the waterproof and breathable film outside the opening of the guard rod.

2. The ultrasonic radar system silicon microphone sensor mounting device realized by the mounting method according to claim 1, characterized by The installation method comprises: The guard rod is provided with an opening for conducting ultrasonic waves, the silicon microphone sensor communicates with the opening of the guard rod through the sound guide pipe, the passage of the opening is arranged obliquely relative to the horizontal direction, and / or the waterproof and breathable film is attached to the outside of the guard rod and covers the opening.

3. The ultrasonic radar system silicon microphone sensor mounting device of claim 2, wherein, The opening is a slant hole, the axis of the slant hole forms an acute angle with the horizontal plane, and the opening direction of the slant hole is inclined towards the ground.

4. The ultrasonic radar system silicon microphone sensor mounting apparatus of claim 2, wherein, The opening is a half moon hole, the hole diameter radius of the half moon hole on the inside of the guard rod is r, the hole on the outside of the guard rod is composed of a half circle with a radius of r on the upper part and a half circle with a radius of R on the lower part, wherein R>r, and the hole opening of the half circle on the lower part is inclined towards the ground.

5. The ultrasonic radar system silicon microphone sensor mounting apparatus of claim 2, wherein, The guard rod is not provided with an opening, the silicon microphone sensor is located below the ultrasonic sensor, and the sound input hole of the silicon microphone sensor is directed towards the lower inside of the guard rod.

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