CN111561887A - Device and method for detecting fetal skin thickness by sound and readable recording medium - Google Patents

Abstract

The invention discloses a device, method and readable recording medium for detecting tire skin thickness using sound. The tire skin thickness detection device is arranged on a tire or inside the tire. The tire skin thickness detection device includes an audio receiver and A controller connected to the audio receiver. The audio receiver is used to receive environmental audio. The controller processes the ambient audio obtained through the audio receiver, and calculates the thickness parameter of the tire according to the amplitude or frequency of the ambient audio. The present invention detects the thickness of the tread in a non-invasive manner. On the other hand, it can operate in a low-power mode, greatly reducing the power required for active detection.

Description

Apparatus, method and readable recording medium for detecting tire skin thickness using sound

technical field

The present invention relates to a tire skin thickness detection device, method and non-temporary computer-readable recording medium, in particular to a device, method and non-temporary computer-readable recording medium for detecting tire skin thickness using sound.

Background technique

According to an investigation by the Road Traffic Safety Steering Committee of the Ministry of Transportation, in 2016, there were as many as 370 tire punctures on national highways, 200 of which were caused by separation of vehicles and tires, and as many as 7,585 cases of tire skin peeling; in addition, the survey pointed out that from 2009 to 2015 In 2018, there were 2,786 tire blowouts on national highways, of which 2,033 caused vehicle damage, and 753 casualties, with a casualty rate of 27%. In addition to affecting the safety of drivers themselves, What's more, it may further lead to a series of car accidents, resulting in serious casualties.

The occurrence of tire puncture, in addition to the foreign body invasion and the tire blowout caused by insufficient tire pressure, is mainly caused by the insufficient thickness of the tire skin. Insufficient tire skin thickness not only affects the grip of the vehicle's tires, but when the tire skin thickness is lower than the safety threshold, the tire will easily burst from the area with insufficient strength on the tread, resulting in a tire blowout.

In response to the above problems, the current mainstream method is to directly judge by visual inspection. The judgment standard is that the tread pattern of the tire must be 1.6mm above the safety line to meet the safety standard; in addition to the visual inspection method, the most mainstream method is to pass The tool (tread depth measurer) directly measures the depth of the tread to judge whether it meets the safety standards. The above two methods depend on the independent judgment of the owner or the maintenance staff. In the automatic detection technology, part of the technology is to set the wire inside the tire in an embedded way, and by judging whether the wire is broken, it is confirmed whether the tire has been used in the warning position, and the status of the tire is confirmed; in the non-invasive method, such as The CN106827974A patent is to actively send signals through ultrasonic waves, and calculate the thickness of the tire skin through the time difference between ultrasonic transmission and reception. However, the ultrasonic detection method requires considerable power to perform, and is not suitable for constant detection.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to solve the defect that ultrasonic detection in the conventional technology often requires considerable power to be performed and is not suitable for constant detection.

In order to achieve the above object, the present invention provides a device for detecting the thickness of the tire skin by sound, which is arranged on the tire or on the inner side of the tire. The tire skin thickness detection device includes an audio receiver and a controller connected to the audio receiver. The audio receiver is used for receiving ambient audio. The controller processes the obtained ambient audio through the audio receiver, and calculates a thickness parameter of the tire according to the amplitude or frequency of the ambient audio.

Further, after obtaining the environmental audio, the controller periodically records the constant amplitude or frequency, and outputs a foreign object warning message when an abnormal surge or frequency is detected.

Further, the device for detecting tire skin thickness by sound further comprises a communication module connected to the controller, after the controller calculates and obtains the thickness parameter, the thickness parameter is wirelessly transmitted through the communication module mode to a reader.

Further, the device for detecting the thickness of the tire skin by sound further comprises a power supply connected to the controller, the power supply is connected to the communication module and obtained by the communication module and coupled to the reader induced current.

Further, the communication protocol adopted by the communication module is radio frequency identification (RFID), wireless network (WiFi), Zigbee (Zigbee), Bluetooth (Bluetooth), global system for mobile communication (GSM), third generation communication system ( 3G) or the fourth generation communication system (4G).

Further, the audio receiver is a microphone.

Further, the controller obtains a look-up table after storing or loading the storage unit, and the look-up table includes a database indexed by the amplitude or frequency as the thickness parameter.

Further, when the amplitude or the frequency obtained through the audio receiver does not appear in the look-up table, the controller calculates and obtains the thickness parameter by interpolation.

Another object of the present invention is to provide a method for detecting the thickness of a tire skin by using sound, comprising: starting and enabling a controller via a remote reader; after the controller is started, starting a microphone to receive ambient audio ; Analyze the constant amplitude or frequency of the ambient audio, and obtain the average amplitude or average frequency within a fixed time interval; calculate the thickness parameter of the tire according to the average amplitude or average frequency.

Further, after obtaining the environmental audio, the controller periodically records the constant amplitude or frequency, and outputs a foreign object warning message when an abnormal surge or frequency is detected.

Further, the calculation method of the thickness parameter is as follows: load a look-up table, the look-up table includes a database indexed with amplitude or frequency as the thickness parameter; when the obtained average amplitude or average frequency does not appear in the look-up table, use The interpolation method calculates and obtains this thickness parameter.

Another object of the present invention is to provide a non-transitory computer-readable recording medium for storing a computer program. After the controller carries a human and executes the computer program, the above-mentioned method can be completed.

Therefore, the technology of the present invention can operate in a relatively low power mode, effectively reducing the operating power required by the sensor, and increasing the practicability and versatility of the product.

Description of drawings

FIG. 1 is a block schematic diagram of a device for detecting tire skin thickness by sound according to the present invention.

FIG. 2 is a working schematic diagram of the device for detecting tire skin thickness by sound according to the present invention.

FIG. 3 is a schematic diagram of a tire structure.

FIG. 4 is a schematic diagram (1) of the simulation of sound data.

FIG. 5 is a schematic diagram (1) of a look-up table.

FIG. 6 is a schematic diagram (2) of a look-up table.

FIG. 7 is a schematic diagram (2) of the simulation of sound data.

FIG. 8 is a schematic diagram (1) of the calculation flow of the method for detecting the thickness of the tire skin by sound according to the present invention.

FIG. 9 is a schematic diagram (2) of the calculation flow of the method for detecting the thickness of the tire skin by sound according to the present invention.

Description of reference numbers:

100 devices

10 Audio receiver

20 Communication module

30 Power Supply

40 Controllers

200 readers

T tire

T1 dentate structure

T2 groove

A1 Flat

A2 Surge area

S reference level

A Abnormal surge

Step S01 - Step S10

Step S71-Step S72.

Detailed ways

The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

The present invention can be used in conjunction with an on-board computer (ECU) or a vehicle head unit (Head Unit), and is set to meet the manufacturer's customized requirements when the vehicle leaves the factory. The system detects and cooperates with the operation of various components; the present invention can also be implemented through a third-party device attached to the vehicle, and the third-party control system cooperates with the original vehicle components or the auxiliary vehicle components, thereby obtaining various components on the vehicle. driving data.

The driving data that can be processed by the central control system or the third-party control system include the engine work index of the vehicle (such as fuel injection, air-fuel ratio control, engine speed, etc.), tire conditions (such as tire pressure index, tire abnormal state, tire skin thickness index, etc. ) or user experience equipment (such as air conditioning control, driving recorder, audio, navigation, display, etc.); through the central control system or third-party control system, the user can confirm the status of the vehicle in real time through the human-machine interface, or can directly When an abnormal state is detected by the human-machine interface, the system actively feeds back an abnormal prompt to the driver or user, allowing the user to perceive the vehicle's condition in real time and take necessary measures. In addition to the above structure, the central control system or the third-party control system can also link the user's mobile device through wireless means (such as Wi-Fi local area network, Bluetooth device, radio frequency identification, etc.), and detect the status of the vehicle through the mobile device.

The present invention can be applied to the above-mentioned structure to detect the thickness of the tire skin of the vehicle, and to detect the thickness parameter of the tire skin of the vehicle in real time through the central control system or the third-party control system. Please refer to FIG. 1 below, which is a block schematic diagram of the device for detecting tire skin thickness by sound, as shown in the figure:

This embodiment discloses a device 100 for detecting the thickness of tire skin by using sound, which can be installed on the tire or at the inner side of the tire to detect ambient audio, and obtain the sound (including the ambient audio) generated when the tire rolls from the ambient audio. Naturally generated ultrasound (non-active ultrasound)), and the tire pressure thickness is calculated based on the waveform generated by the sound. The position on the tire or the inner side of the tire includes being directly arranged on the tire, embedded in the inner side of the tire, attached to the wall surface of the inner side of the tire, attached to the wall surface of the inner rim of the tire, or arranged at a position close to the tire, The above-mentioned positions are not intended to limit the scope of the present invention.

The detailed structure of the apparatus 100 for detecting tire skin thickness by sound will be described below. The apparatus 100 of the present invention mainly includes an audio receiver 10, a communication module 20, a power supply 30, and a connection to the audio receiver. 10. The communication module 20 and the controller 40 of the power supply 30 .

The audio receiver 10 is used to receive ambient audio, convert the ambient audio into electrical signals, and then transmit them to the controller 40 for detection. In a preferred embodiment, the audio receiver 10 can be a microphone, which converts physical information into electronic signals through a diaphragm. The microphone can be, for example, a dynamic microphone, a condenser microphone, or a ribbon microphone, which is not limited in the present invention.

The communication module 20 is connected to the controller 40, and the communication module 20 is coupled to the reader 200 (central control system or third-party control system) by wireless transmission, whereby the reader 200 can access the controller 40 data to collect tire data. In a preferred embodiment, the communication protocol adopted by the communication module 20 is Radio Frequency Identification (RFID), Wireless Network (WiFi), Zigbee, Bluetooth, Global System for Mobile Communication (GSM) , the third generation communication system (3G) or the fourth generation communication system (4G). The reader 200 transmits signals to the communication module 20 by using high-frequency electromagnetic waves. After the antenna of the communication module 20 receives the high-frequency electromagnetic waves, a resonance current is formed through the resonance circuit, and the controller 40 is activated by the resonance current. After receiving the transmitted signal, the response signal is reversely transmitted to the reader 200 .

The power supply 30 is connected to the communication module 20, the power supply 30 is used to obtain the resonance current through the communication module 20, and feed the resonance current after preprocessing to start and enable the control device 40. In the preferred embodiment, the power supply 30 can be, for example, a filter, an AC-to-DC converter, a transformer or other such preprocessing circuits, which are not limited in the present invention.

The controller 40 is connected to the audio receiver 10 , the communication module 20 , and the power supply 30 for cooperating with the operation of these devices. In a preferred embodiment, the controller 40 can be a microprocessor (MicroProcessor), which is activated after being enabled by the power supply 30, and executes the corresponding algorithm. The controller 40 processes the obtained ambient audio through the audio receiver 10, and calculates a thickness parameter of the tire according to the amplitude or frequency of the ambient audio. After calculating and obtaining the thickness parameter, the controller 40 transmits the thickness parameter to the reader 200 via the communication module 20 through wireless transmission. The calculation method of the thickness parameter will be described in detail later by way of example.

Please refer to FIG. 2 together below, which is a working schematic diagram of the device for detecting tire skin thickness by sound, as shown in the figure:

The reader 200 can be implemented directly as the head unit of the vehicle, or by attaching the device to the vehicle in the form of a third-party device; the reader 200 can be connected to the devices 100 in several tires in the comparative example. In a preferred embodiment, an omnidirectional antenna can be used to output electromagnetic wave signals to connect several devices 100; although the position of the tire is fixed, the device 100 may change its position as the tire rotates when it is installed in the tire. In order to avoid the shielding phenomenon of the device 100 at some positions, it seems to be a more reasonable method to use an omnidirectional antenna. However, although the tires will change the position of the device 100 due to rolling, they are relatively fixed on the vehicle body. At the position where the directional antenna is implemented, the lobe angle of the lobe of the directional antenna can be appropriately expanded so as to be coupled to the plurality of devices 100 . In another preferred embodiment, the reader 200 can also use the sensor array to send and receive signals directionally through the beamforming technology and adjust the parameters of the basic unit of the phase array to make certain angles. The signal of the angle obtains constructive interference, and the signal of other angles obtains the destructive interference, thereby outputting several beams at the same time.

If so, the device 100 is located at a relatively stable location on the vehicle (eg, near the tires, but not on the tires). Then the reader 200 has the opportunity to be coupled to several of the devices 100 via a highly directional antenna.

The following describes the calculation method of the controller 40 for calculating the thickness of the tire skin in the present invention. Please refer to FIG. 3, FIG. 4 and FIG. Schematic diagram, as shown in the figure:

The detection method of the present invention can be calculated through the tread characteristics of the tire itself. It should be noted here that since the tread state of each tire is slightly different, the algorithm to be executed (for example, the parameters stored in the lookup table) There will also be different calculation methods according to different tires.

As shown in FIG. 3 , the disclosed tire T has several tooth-like structures T1 at positions corresponding to distances, and such structures are commonly found on the tread surface of existing tires. When the audio receiver 10 receives the ambient audio, after the noise is removed, corresponding surges will appear intermittently according to the rotation speed of the tire T. These surges are generated in the grooves T2 between the tooth-like structures T1 on the tire. The iso-groove T2 acts as a resonant cavity to cause resonance between the tire T and the ground when running in, thereby generating a corresponding surge on the sound signal.

Generally speaking, the amplitude of the surge will decrease as the tread decreases. By analyzing the amplitude of the decrease in amplitude, the usage status of the tire can be confirmed. Please also refer to FIG. 4 , the signal of the ambient audio is divided into two parts: the flat area A1 and the surge area A2. In this embodiment, the surge area A2 is the area of interest in the signal, which is used to analyze the thickness of the tire skin In principle, only the amplitude of the surge area A2 needs to be detected, and the tire skin thickness can be calculated by substituting the amplitude of the surge area A2; however, the relationship between the amplitude and the tire skin thickness may be caused by the difference of the ground material when the vehicle is running. In a preferred embodiment, the flat area A1 can be used as the reference level S to evaluate the ground condition, and the reference level S can be used as a parameter for correction.

In another preferred embodiment, in order to reduce the complexity of the operation and increase the speed of the operation, the controller 40 can store a look-up table or load a storage unit to obtain the look-up table, the look-up table includes the amplitude as the thickness parameter. Index the database and find the corresponding thickness parameter by substituting the detected amplitude into this look-up table.

For example, as shown in Figure 5, the obtained surge peak value is about 1.3mV. By looking up the content of 1.3mV in the lookup table, the corresponding tire skin thickness in the lookup table is 10mm, then the tire's The thickness is 10mm. The same as the situation described above, considering the different conditions of the ground, basically, the reference level S of the flat area A1 can be used as a parameter to be substituted into the correction, and the corrected result can be used as an index to confirm the corresponding thickness parameter through the look-up table, or you can directly Several look-up tables are stored in advance for various ground conditions, the corresponding look-up tables are directly confirmed by the reference level, and then the corresponding thickness parameters are found from the corresponding look-up tables.

Referring to FIG. 4 again, in another preferred embodiment, the frequency of the surge will also decrease as the tread is tapered. By analyzing the magnitude of the frequency reduction, the usage status of the tire can be confirmed. When performing the frequency calculation, the frequency may be calculated only for the smooth area A1 or only for the surge area A2 or the frequency may be calculated for the smooth area A1 and the surge area A2, which is not limited in the present invention. Similarly, when the vehicle is running, there may be a certain error in the correlation between the frequency and the thickness of the tire skin due to the different materials of the ground (change in environmental conditions). At this time, the flat area A1 can be used as the reference level S to evaluate the ground condition. , and substitute the reference level S as a parameter for correction.

The look-up table is shown in Figure 6. Assuming that the obtained frequency falls at a value of 100khz, the corresponding tire thickness in the look-up table is 9.7mm through the content of the look-up table 100khz, then the thickness of the tire is 9.7mm. The same as the situation described above, considering the different conditions of the ground, basically, the reference level S of the flat area A1 can be used as a parameter to be substituted into the correction, and the corrected result can be used as an index to confirm the corresponding thickness parameter through the look-up table, or you can directly Several look-up tables are stored in advance for various ground conditions, the corresponding look-up tables are directly confirmed by the reference level, and then the corresponding thickness parameters are found from the corresponding look-up tables.

In a preferred embodiment, when the amplitude or the frequency obtained by the audio receiver 10 does not appear in the look-up table, the controller 40 can calculate and obtain the thickness parameter by interpolation. The method of interpolation calculation can be calculated by linear calculation and interpolation, and can also be calculated by means of quadratic parabola, cubic or multiple parabolas, which is not limited in the present invention.

In a preferred embodiment, the abnormal sound can also be used to detect whether the tire has foreign objects or wear. Please also refer to Figure 7, which is a schematic diagram (2) of the simulation of sound data, as shown in the figure:

In order to detect the abnormal state of the tire, the controller 40 can periodically record the constant amplitude or frequency after obtaining the environmental audio, and output a foreign object warning message when abnormal surge or frequency is detected.

Specifically, the controller 40 can determine whether there is foreign matter intruding into the tire by analyzing the waveform or setting a threshold. Waveform analysis, for example, after periodically recording the waveform, compare the recorded waveform of the previous sampling band (or the normal waveform of the general band) with the waveform of the next sampling band. When the waveform of the band has a significant difference in characteristics such as amplitude or frequency (abnormal surge A in Figure 7), it is determined that there is an abnormality. The method of setting the threshold is relatively simple. The average value of the amplitude or frequency is periodically recorded and the upper and lower thresholds are set based on the average value. The amplitude or frequency of the next cycle is different from the amplitude and frequency of the previous cycle. And when it exceeds the threshold range, it can be determined that the tire has foreign matter intrusion.

For example, the cycle can record the sound with the unit time as the cycle, or the sound can be recorded by the number of tire laps; because the foreign matter on the tire generally produces an abnormal sound in the time period when the tire rotates one circle, it is better to implement For example, the calculation can be performed with each lap as a unit period, or it is better to perform periodic analysis with a time lower than a single lap rotation, or with a smaller unit as a period, for example, the time interval between the tread and the tread is The sound is recorded periodically and the calculation is performed once, which is not limited in the present invention.

The above algorithm can also be applied to tire puncture early warning detection. When the controller 40 detects an abnormal surge or when the tire skin thickness reaches a critical value, it can simultaneously evaluate several tire conditions to provide tire puncture early warning. The rate of decompression, and/or the squeak amplitude is taken into the formula as a parameter to obtain the remaining time to puncture and provide early warning of puncture.

The following is a detailed description of the method of the present invention for detecting the thickness of the tire skin by sound. Please refer to FIG. 8 together.

The present invention utilizes sound to detect the method for tire skin thickness, which mainly includes the following processes:

The reader 200 is activated, and the activation of the reader 200 may be a state in which power is supplied to the reader when the vehicle is started, or when a third-party device is turned on (step S01 );

When the reader 200 is activated, the reader 200 transmits an inquiry and response signal to the controller 40, and when the controller 40 receives the inquiry signal, it is activated and enabled via the remote reader 200 (step S02). );

After the controller 40 is started, the controller 40 first judges whether the vehicle is running, and executes the decision according to whether the vehicle is running (step S03); when it is confirmed that the vehicle is not running, the controller 40 feeds back the final tire skin thickness data obtained during the latest running. Go to the man-machine interface for the user to confirm (step S04), and repeat the decision of step S03; when it is confirmed that the vehicle is in a driving state, start the audio receiver 40 to receive environmental audio (step S05);

After receiving the ambient audio, analyze the constant amplitude or frequency of the ambient audio, and obtain an average amplitude or an average frequency within a fixed time interval (step S06 );

Calculate the thickness parameter of the tire according to the average amplitude or average frequency (step S07); it should be noted that step S06 or step S07 can be executed by the controller 40 or by the reader 200; when executed by the controller 40, the control The signal fed back by the controller 40 to the reader 200 is the thickness parameter; when executed by the reader 200, the signal fed back by the controller 40 to the reader 200 is ambient audio or average amplitude/average frequency.

In addition to the thickness detection, after receiving the environmental audio in step S05, the controller periodically records the constant amplitude or frequency (step S08); detects whether there is an abnormal surge or frequency according to the constant amplitude or frequency (step S09), and A decision is made; when an abnormal surge or frequency is detected, a foreign object warning message is output (step S10 ); if not detected, the actions from steps S08 to S09 are repeated.

Please also refer to FIG. 9 , in a preferred embodiment, the calculation method of the thickness parameter in step S07 is as follows: load a look-up table, the look-up table includes a database indexed by amplitude or frequency as the thickness parameter (step S71 ); When the obtained average amplitude or the average frequency does not appear in the look-up table, the thickness parameter is calculated and obtained by the interpolation method (step S72).

The above-mentioned method steps can be implemented by means of a computer-readable recording medium, such as a read-only memory, a flash memory, a floppy disk, a hard disk, a CD-ROM, a portable disk, a magnetic tape, a network-accessible recording medium, etc. Databases or those skilled in the art can easily contemplate storage media with the same function. When the computer program is loaded and executed by the controller, the method as described above can be accomplished.

To sum up, the technology of the present invention can operate in a relatively low power mode, effectively reducing the operating power required by the sensor, and increasing the practicability and versatility of the product.

The structure, features and effects of the present invention have been described in detail above according to the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention, but the scope of the present invention is not limited by the drawings. Changes made to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, shall fall within the protection scope of the present invention as long as they do not exceed the spirit covered by the description and drawings.

Claims (12)

1. A device for detecting a skin thickness by sound, provided on or inside a tire, the skin thickness detection device (100) comprising:

an audio receiver (10) for receiving environmental audio; and

a controller (40) connected to the audio receiver (10), wherein the controller (40) processes the obtained environmental audio through the audio receiver (10) and calculates the thickness parameter of the tire according to the amplitude or frequency of the environmental audio.

2. The apparatus of claim 1, wherein the controller periodically records the amplitude or frequency of the environmental audio signal and outputs a foreign object warning message when an abnormal surge or frequency is detected.

3. The device for detecting fetal skin thickness by sound according to claim 1, further comprising a communication module (20) connected to the controller, wherein the controller (40) calculates and obtains the thickness parameter and then transmits the thickness parameter to a reader (200) through the communication module (20) by wireless transmission.

4. The device for detecting fetal skin thickness by sound according to claim 3, further comprising a power supply (30) connected to the controller (40), wherein the power supply (30) is connected to the communication module (20) and obtains the induced current generated by the communication module (20) coupled to the reader (200).

5. The apparatus of claim 4, wherein the communication module employs a communication protocol selected from the group consisting of RFID, wireless, ZigBee, Bluetooth, GSM, RS, and RS.

6. The device for detecting fetal skin thickness by sound as claimed in claim 1, wherein the audio receiver (10) is a microphone.

7. The apparatus for detecting fetal skin thickness by sound as claimed in claim 1, wherein the controller (40) obtains a look-up table by storing or loading a storage unit, the look-up table comprising a database indexed by amplitude or frequency as a thickness parameter.

8. The apparatus for detecting fetal skin thickness by sound according to claim 7, wherein the controller (40) interpolates and obtains the thickness parameter when the amplitude or the frequency obtained by the audio receiver (10) does not appear in the look-up table.

9. A method for detecting fetal skin thickness using sound, comprising:

the controller (40) is activated and enabled via a remotely located reader (200);

after the controller (40) is started, starting an audio receiver (10) to receive the environmental audio;

analyzing the constant amplitude or frequency of the environment audio and obtaining the average amplitude or average frequency in a fixed time interval; and

and calculating the thickness parameter of the tire according to the average amplitude or the average frequency.

10. The method of claim 9, wherein after obtaining the environmental audio signal, the controller periodically records the amplitude or frequency of the environmental audio signal and outputs a foreign object warning message when detecting an abnormal surge or frequency.

11. The method for detecting the thickness of the fetal skin by using the sound as claimed in claim 9, wherein the thickness parameter is calculated as follows:

the controller (40) loads a look-up table comprising a database indexed by amplitude or frequency as a thickness parameter; and

the controller (40) interpolates and obtains the thickness parameter when the obtained average amplitude or the obtained average frequency does not appear in the look-up table.

12. A readable recording medium storing a computer program for performing the method according to any one of claims 9-10 when the computer program is loaded and executed by a controller.

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