WO2020119410A1

WO2020119410A1 - Tire thickness measuring method and monitoring system

Info

Publication number: WO2020119410A1
Application number: PCT/CN2019/119804
Authority: WO
Inventors: 尤山泉; 沈燕霞; 林东峰; 陈豪; 洪英杰; 金传兵
Original assignee: 上海为彪汽配制造有限公司
Priority date: 2018-12-14
Filing date: 2019-11-20
Publication date: 2020-06-18
Also published as: CN109532353B; CN109532353A

Abstract

A tire thickness measuring method and a monitoring system, the method comprising: on the basis of the current monitored tire pressure of a tire and the model number of the tire, analyzing to obtain a first time required for ultrasound waves to travel from an ultrasonic sensor (20) to the tire; acquiring a second time required for ultrasound waves to travel to and from the ultrasonic sensor (20) and the floor; on the basis of the first time and the second time, calculating tire propagation time; and on the basis of the tire propagation time and a second preset propagation speed, calculating the thickness of the tire.

Description

Tire thickness detection method and monitoring system

Technical field

The invention relates to the field of vehicles, in particular to a tire thickness detection method and monitoring system.

Background technique

With the development of technology, people's daily travel is becoming more and more convenient. The emergence of cars has greatly reduced the time people travel to the two places and facilitated people's travel. But for the long-term use of vehicles, the tires of vehicles are also constantly worn. When the tires are seriously worn, it is easy to cause insufficient grip of the ground on the vehicle, which in turn is likely to cause traffic accidents.

At present, the user usually directly observes whether the tire is close to the wear mark through the naked eye. However, since the precision when the wear mark is observed through the naked eye is low, and the user often needs to observe the tire, the operation is cumbersome, which is not conducive to the user's operation.

Summary of the invention

The purpose of the present invention is to provide a tire thickness detection method and monitoring system. The tire thickness calculation is relatively simple, and the user can view the tire thickness in the control module without observing the tire, and the control module has high monitoring accuracy.

The technical solutions provided by the present invention are as follows:

A tire thickness detection method includes: according to the current tire pressure of the monitored tire and the type of tire, the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor is analyzed and obtained; The second time required for the round trip between the ground; based on the first time and the second time, the tire propagation time is calculated; based on the tire propagation time and the second preset propagation velocity, the tire's thickness.

Further, according to the monitored current tire pressure of the tire and the type of the tire, the first time required for the analysis to obtain the ultrasonic wave from the ultrasonic sensor to the tire specifically includes: acquiring the monitored current tire pressure of the tire; The stored tire model is analyzed to obtain the deformation of the tire under the current tire pressure; based on the deformation of the tire and the initial distance between the ultrasonic sensor and the tire, the analysis is performed to obtain the relationship between the ultrasonic sensor and the tire The minimum distance between the ultrasonic sensor and the tire; the minimum distance is used as the first distance between the ultrasonic sensor and the tire; based on the first preset propagation speed and the first distance, calculate the ultrasonic wave from the ultrasonic sensor to the The first time it takes to tire.

Further, the step of acquiring the second time required for the ultrasonic waves to travel back and forth between the ultrasonic sensor and the ground specifically includes: the ultrasonic sensor emits ultrasonic waves, and the time for transmitting the ultrasonic waves is used as the starting time; when the ultrasonic sensor receives the reflected ultrasonic waves At the time, the time of the received reflected ultrasonic wave is used as the end time; based on the start time and the end time, the time difference between the start time and the end time is calculated; the time difference is used as the ultrasonic sensor The second time required to travel to and from the ground.

Further, after calculating the time difference between the start time and the end time according to the start time and the end time, the method further includes: analyzing whether a second time already exists; when there is no second time, performing steps Use the time difference as the second time required to travel back and forth between the ultrasonic sensor and the ground; when the second time already exists, analyze whether the time difference is less than the second time; when the time difference is less than the second time Time, replace the second time with the time difference.

Further, according to the current tire pressure of the monitored tire and the model of the tire, the step first analyzes and obtains the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor, and then the step of acquiring the ultrasonic wave travels between the ultrasonic sensor and the ground. Before the second time required, it also includes: obtaining the driving speed of the vehicle; calculating the rotation cycle of the tire according to the driving speed of the vehicle and the type of the tire; according to the rotation cycle and the preset monitoring frequency, The monitoring frequency is calculated; the ultrasonic sensor is controlled to emit ultrasonic waves according to the monitoring frequency.

One of the objects of the present invention is also to provide a tire thickness detection system, including a tire pressure monitor, an ultrasonic sensor, and a control module; the tire pressure monitor can be used to monitor the current tire pressure of the tire and the monitored tire The current tire pressure is sent to the control module; the control module is used to analyze the first time required for the ultrasound to reach the tire from the ultrasound sensor according to the current tire pressure of the tire and the model of the tire; and It is used to control the ultrasonic sensor to emit ultrasonic waves; the ultrasonic sensor is used to obtain the second time required for the ultrasonic waves to travel back and forth between the ultrasonic sensor and the ground, and the tire propagation is calculated according to the first time and the second time Time, and send the tire propagation time to the control module; the control module is also used to calculate the thickness of the tire based on the tire propagation time and the second preset propagation speed.

Further, the control module includes: a first receiving unit for receiving the current tire pressure of the tire sent by the tire pressure monitor; a deformation storage unit for storing the model of the tire and the tire under various tire pressures Deformation variable; Deformation analysis unit, based on the stored tire model, analyzes and obtains the deformation variable of the tire under the current tire pressure; Spacing analysis unit, according to the deformation variable of the tire and between the ultrasonic sensor and the tire The initial distance is analyzed to obtain the minimum distance between the ultrasonic sensor and the tire; the minimum distance is used as the first distance between the ultrasonic sensor and the tire; the time calculation unit is based on the first preset propagation speed and For the first distance, the first time required for ultrasonic waves to reach the tire from the ultrasonic sensor is calculated.

Further, the control module includes: an ultrasonic control unit for controlling the ultrasonic sensor to emit ultrasonic waves and receiving a feedback signal sent by the ultrasonic sensor; and a time unit for taking the time for controlling the ultrasonic sensor to emit ultrasonic waves as a starting time ; And the time of receiving the feedback signal sent by the ultrasonic sensor as the end time; based on the start time and the end time, the time difference between the start time and the end time is calculated; the time difference is used as The second time required to travel back and forth between the ultrasonic sensor and the ground.

Further, the control module further includes: a time analysis unit for analyzing whether a second time already exists; when the second time does not exist, the time unit uses the time difference as a round trip required between the ultrasonic sensor and the ground The second time; when the second time already exists, the time unit analyzes whether the time difference is less than the second time; when the time difference is less than the second time, the time unit replaces the time difference The second time.

Further, it also includes a speed monitor for monitoring the speed of the vehicle and sending the monitored speed of the vehicle to the control module; the control module includes: a second receiving unit that receives the speed monitoring The speed of the vehicle sent by the device; the cycle analysis unit, based on the running speed of the vehicle and the type of the tire, calculates the rotation cycle of the tire; the frequency analysis unit, based on the rotation cycle and the preset monitoring frequency, calculates Obtain the monitoring frequency; an ultrasonic control unit for controlling the ultrasonic sensor to emit ultrasonic waves.

Compared with the prior art, the tire thickness detection method and monitoring system provided by the present invention have the following beneficial effects:

1. Through the monitoring of tire pressure, the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor, that is, the deformation of the tire, and then the second time required for the round trip between the ultrasonic sensor and the ground according to the ultrasonic wave can be The thickness of the tire is obtained, and the calculation of the thickness of the tire is relatively simple, and the user can view the thickness of the tire in the control module without observing the tire, and the monitoring accuracy of the control module is high.

2. When the tire signal and the current tire pressure are obtained, the control module can analyze the deformation variable of the tire. Based on the distance between the control module and the tire stored in the control module, the deformed tire and ultrasound can be calculated The minimum distance between sensors.

3. Through the setting of the start time and the end time, the second time required for the control module to obtain the ultrasonic wave to and fro between the ultrasonic sensor and the ground can be realized, and the monitoring process is relatively simple, and no other control operations are required.

4. During the side view, the control module cannot know whether the ultrasonic sensor has moved to the position directly below, that is, it cannot know whether the second time obtained by the previous test is required for the round trip between the ultrasonic sensor and the ground The minimum time, therefore, the control module can compare the second time with the time difference obtained in this test.

5. When monitoring the time when the ultrasonic wave is transmitted between the ultrasonic sensor and the ground, that is, the second time, it is difficult for the control module to ensure that the ultrasonic sensor is at the bottom of the bottom to start monitoring. Therefore, the control module can implement multiple monitoring to Further increase the accuracy of the acquired second time.

BRIEF DESCRIPTION

In the following, the preferred embodiments will be described in a clear and easy-to-understand manner with reference to the drawings, and the above-mentioned characteristics, technical features, advantages and implementations of a tire thickness detection method and monitoring system will be further described.

1 is a schematic flowchart of a tire thickness detection method of the present invention;

2 is a schematic flowchart of another tire thickness detection method of the present invention;

3 is a schematic flowchart of step S3 in a tire thickness detection method of the present invention;

4 is a schematic flowchart of another tire thickness detection method of the present invention;

5 is a schematic structural diagram of a tire thickness detection system of the present invention;

6 is a schematic structural diagram of a control module in a tire thickness detection system of the present invention;

7 is a schematic structural diagram of a control module in another tire thickness detection system of the present invention;

8 is a schematic structural diagram of a control module in another tire thickness detection system of the present invention.

Description of reference numerals: 10. Tire pressure monitor, 20. Ultrasonic sensor, 30. Control module, 301. First receiving unit, 302. Deformation storage unit, 303. Deformation analysis unit, 304. Spacing analysis unit, 305. Time Calculation unit, 306. Ultrasonic control unit, 307. Time unit, 308. Time analysis unit, 309. Second receiving unit, 310. Period analysis unit, 311. Frequency analysis unit, 40. Speed monitor.

detailed description

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative labor, other drawings can also be obtained from these drawings and obtained Other implementations.

In order to make the drawings concise, the figures only show parts related to the invention, and they do not represent their actual structure as a product. In addition, in order to make the drawings concise and easy to understand, in some drawings, components having the same structure or function are only schematically illustrated, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one".

According to an embodiment provided by the present invention, as shown in FIG. 1, a tire thickness detection method includes:

S1. According to the monitored current tire pressure of the tire and the type of the tire, analyze and obtain the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor.

When the control module obtains the tire pressure, the control module can calculate the deformation of the tire based on the stored tire signal. Since the ultrasonic sensor is installed in the tire in advance, the distance between the ultrasonic sensor and the tire is obtained. Therefore, After calculating the deformation of the tire, the distance between the ultrasonic wave and the tire can be obtained.

According to the speed of the ultrasonic wave, the propagation time of the ultrasonic wave in the tire can be analyzed, that is, the first time t1 required for the ultrasonic wave to reach the tire from the ultrasonic sensor.

S3. Acquire the second time required for ultrasonic waves to travel between the ultrasonic sensor and the ground.

When the user needs to monitor the thickness of the tire, or when the tire thickness needs to be monitored under any conditions, the ultrasonic sensor can send ultrasonic waves, and the ultrasonic sensor can control the power it receives, used to receive the ultrasonic waves reflected on the ground, and acquire the ultrasonic waves. The second time t2 required for the round trip between the ground.

S4. According to the first time and the second time, calculate the tire propagation time.

The propagation time t3 is the propagation time of ultrasonic waves in the tire, and the propagation time t3=t2-2*t1.

S5. According to the tire propagation time and the second preset propagation velocity, calculate the thickness of the tire.

The second preset propagation speed is the propagation speed of ultrasonic waves in the tire v3, so the thickness of the tire s3=t3*v3.

In this embodiment, the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor can be obtained through the monitoring of the tire pressure, that is, the deformation amount of the tire, and then the second time required for the round trip between the ultrasonic sensor and the ground according to the ultrasonic wave , The thickness of the tire can be obtained, and the user can know the wear of the tire. The calculation of the thickness of the tire is relatively simple, and the user can view the thickness of the tire in the control module without observing the tire, and the monitoring accuracy of the control module is relatively low high.

According to another embodiment provided by the present invention, as shown in FIG. 2, a tire thickness detection method includes:

S11. Obtain the current tire pressure of the monitored tire.

S12. According to the stored tire type, analyze and obtain the deformation amount of the tire under the current tire pressure.

S13. According to the deformation amount of the tire and the initial distance between the ultrasonic sensor and the tire, analyze and obtain the minimum distance between the ultrasonic sensor and the tire.

S14. Use the minimum distance as the first distance between the ultrasonic sensor and the tire.

S15. Calculate the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor according to the first preset propagation speed and the first distance.

Since the tire abuts on the ground and then deforms, when the tire is rotating, the ultrasonic sensor is located at the lowermost side, and the distance between the ultrasonic sensor and the tire is the smallest. When the tire model and current tire pressure are obtained, the control module can analyze the deformation variables of the tire. Based on the initial distance between the ultrasonic sensor and the tire stored in the control module, the deformed tire and the ultrasonic sensor can be calculated The minimum spacing between.

After taking the above minimum distance as the first distance, the first preset propagation speed refers to the propagation speed of ultrasonic waves in the air. Therefore, the control module can calculate the first time required for the ultrasonic waves to reach the tire from the ultrasonic sensor.

Preferably, a temperature sensor can also be provided in the tire pressure monitoring for monitoring the temperature of the air in the tire, and when the temperature is monitored, the monitored temperature is sent to the control module. When the control module receives the temperature, the corresponding Updating the propagation speed of ultrasonic waves in the air, that is, the first preset propagation speed, increases the accuracy of the obtained first pitch, which in turn increases the accuracy of the thickness of the obtained tire.

According to yet another embodiment provided by the present invention, as shown in FIGS. 1 and 3, a tire thickness detection method includes:

S31. The ultrasonic sensor emits ultrasonic waves, and the time for transmitting the ultrasonic waves is used as the start time.

S32. When the ultrasonic sensor receives the reflected ultrasonic wave, use the time of the received reflected ultrasonic wave as the termination time.

S33. Calculate the time difference between the start time and the end time according to the start time and the end time.

S35. Use the time difference as the second time required for the round trip between the ultrasonic sensor and the ground.

Preferably, after step S33, it further includes:

S34. Analyze whether the second time already exists.

When there is no second time, step S35 is executed.

S36. When the second time already exists, analyze whether the time difference is less than the second time.

S37. When the time difference is less than the second time, replace the time difference with the second time.

When the control module needs to detect the distance between the ultrasonic sensor and the ground, the ultrasonic wave can start emitting ultrasonic waves to achieve distance measurement, and the time difference between the time when the ultrasonic wave is emitted and the time when the ultrasonic wave is received is taken as the second time.

In this embodiment, by setting the start time and the end time, the second time required for the control module to obtain the ultrasonic wave to and fro between the ultrasonic sensor and the ground can be achieved, and the monitoring process is relatively simple, and no other control operations are required.

Preferably, when the control module acquires the time required for the ultrasonic wave to travel between the ultrasonic sensor and the ground multiple times during the monitoring process, the control module can first analyze whether there is a second time. When there is no second time, it indicates that this time The test is the first test, and the control module can directly use the acquired time difference as the second time.

And when it is detected that there is a second time, this test is not the first side view. During the side view, the control module cannot know whether the ultrasonic sensor moves to the position directly below, that is, it cannot know whether the second time obtained by the previous test is the minimum required for the round trip between the ultrasonic sensor and the ground Time, therefore, the control module can compare the second time with the time difference obtained in this test. When the time difference is less than the second time, the ultrasonic sensor at the second time obtained before the surface is moved to the position directly below. Therefore, this time In the test state, the distance between the ultrasonic sensor and the ground is smaller, and the time difference obtained in this test is taken as the second time.

When the time difference obtained in this test is greater than the second time, it means that the distance between the ultrasonic sensor and the ground in this test state is greater than the distance between the ultrasonic sensor and the ground when the second time is obtained, so there is no need to replace the second time.

According to yet another embodiment provided by the present invention, as shown in FIG. 4, a tire thickness detection method includes:

S21. Obtain the driving speed of the vehicle.

S22. Calculate the rotation period of the tire according to the running speed of the vehicle and the type of the tire.

S23. Calculate the monitoring frequency according to the rotation period and the preset monitoring frequency.

S24. Control the ultrasonic sensor to emit ultrasonic waves according to the monitoring frequency.

The control module can be electrically connected to the speed sensor. Therefore, the control module can obtain the running speed of the vehicle, and then calculate the rotation cycle of the tire.

When monitoring the time when the ultrasonic wave is transmitted between the ultrasonic sensor and the ground, that is, the second time, it is difficult for the control module to ensure that the ultrasonic sensor is located at the bottom of the bottom to start monitoring, so the control module can implement multiple monitoring to further increase The accuracy obtained in the second time.

The control module can have a built-in preset monitoring frequency. The preset monitoring frequency refers to the number of time monitoring in one rotation cycle of the tire. The preset monitoring frequency can be 5 to 10 times, and can be changed according to the needs of the user. Therefore, the monitoring frequency can be obtained by combining the obtained rotation cycle and the preset monitoring frequency, and the higher the preset frequency, the measured tire The accuracy at the second time is also higher, so the accuracy of the measured tire thickness is also higher, but the load on the control module is also greater.

Preferably, the control module can also set the total monitoring time or the number of monitoring or the monitoring period, the tire thickness can be monitored within a certain period of time, and unnecessary waste is reduced, and the monitoring parameters can be changed according to the needs of the user .

According to an embodiment provided by the present invention, as shown in FIG. 5, a tire thickness detection system includes a tire pressure monitor 10, an ultrasonic sensor 20 and a control module 30.

The tire pressure monitor 10 can be used to monitor the current tire pressure of the tire and send the monitored current tire pressure to the control module 30.

The control module 30 is used to analyze and obtain the first time required for ultrasonic waves to reach the tire from the ultrasonic sensor 20 according to the current tire pressure of the tire and the type of the tire; and to control the ultrasonic sensor 20 to emit Ultrasound.

The ultrasonic sensor 20 is used to obtain a second time required for ultrasonic waves to travel back and forth between the ultrasonic sensor 20 and the ground, and according to the first time and the second time, calculate the tire propagation time and propagate the tire Time is sent to the control module 30.

The control module 30 is also used to calculate the thickness of the tire according to the tire propagation time and the second preset propagation velocity.

When the control module 30 obtains the tire pressure, the control module 30 can calculate the deformation of the tire according to the stored tire signal. Since the ultrasonic sensor 20 is installed in the tire in advance, the distance between the ultrasonic sensor and the tire is obtained Therefore, after calculating the deformation of the tire, the distance between the ultrasonic wave and the tire can be obtained.

According to the speed of the ultrasonic wave, the transmission time of the ultrasonic wave in the tire can be analyzed and obtained, that is, the first time t1 required for the ultrasonic wave to reach the tire from the ultrasonic sensor 20.

When the user needs to monitor the thickness of the tire, or when the thickness of the tire needs to be monitored under any conditions, the ultrasonic sensor 20 can send ultrasonic waves, and the ultrasonic sensor 20 can control the power it receives, used to receive the ultrasonic waves reflected on the ground, and acquire the ultrasonic waves. The second time t2 required for the round trip between the sensor 20 and the ground.

The second preset propagation speed is the propagation speed v3 of the ultrasonic waves in the tire, so the thickness of the tire s3=t3*v3.

In this embodiment, the first time required for the ultrasonic waves to reach the tire from the ultrasonic sensor 20 can be obtained through the monitoring of the tire pressure, that is, the deformation amount of the tire, and then according to the ultrasonic wave between the ultrasonic sensor 20 and the ground Two times, the thickness of the tire can be obtained, and the user can know the wear of the tire. The thickness of the tire is relatively simple to calculate, and the user can view the thickness of the tire in the control module 30 without observing the tire, and the control module 30 Monitoring accuracy is high.

Specifically, the tire pressure monitor 10 and the ultrasonic sensor 20 can be provided at the same position of the wheel, or the ultrasonic transmitter can be directly built into the tire pressure monitor 10 to facilitate the installation of the ultrasonic sensor 20.

According to another embodiment provided by the present invention, as shown in FIGS. 5 and 6, a tire thickness detection system includes a tire pressure monitor 10, an ultrasonic sensor 20 and a control module 30.

The control module 30 is also used to calculate the thickness of the tire based on the tire propagation time and the second preset propagation velocity.

The control module 30 includes:

The first receiving unit 301 is configured to receive the current tire pressure of the tire sent by the tire pressure monitor 10.

The deformation storage unit 302 is used to store the tire model and the deformation amount of the tire under various tire pressures.

The deformation analysis unit 303 analyzes and obtains the deformation amount of the tire under the current tire pressure according to the stored tire model.

The distance analysis unit 304 analyzes and obtains the minimum distance between the ultrasonic sensor 20 and the tire according to the deformation amount of the tire and the initial distance between the ultrasonic sensor 20 and the tire; The first distance between the ultrasonic sensor 20 and the tire.

The time calculation unit 305 calculates the first time required for ultrasonic waves to reach the tire from the ultrasonic sensor 20 according to the first preset propagation speed and the first distance.

Since the tire abuts on the ground and then deforms, the ultrasonic sensor 20 is positioned at the lowermost side when the tire is rotating, and the distance between the ultrasonic sensor 20 and the tire is the smallest. When obtaining the tire model and the current tire pressure, the control module 30 can analyze and obtain the deformation variable of the tire. Based on the initial distance between the ultrasonic sensor 20 and the tire stored in the control module 30, the deformed tire can be calculated The minimum distance from the ultrasonic sensor 20.

After taking the above minimum distance as the first distance, the first preset propagation speed refers to the propagation speed of ultrasonic waves in the air. Therefore, the control module 30 can calculate the first time required for the ultrasonic waves to reach the tire from the ultrasonic sensor 20.

Preferably, a temperature sensor can also be provided in the tire pressure monitoring for monitoring the temperature of the air in the tire, and when the temperature is monitored, the monitored temperature is sent to the control module 30, and when the control module 30 receives the temperature, The corresponding updated propagation speed of ultrasonic waves in the air, that is, the first preset propagation speed, increases the accuracy of the obtained first pitch, which in turn increases the accuracy of the obtained tire thickness.

According to yet another embodiment provided by the present invention, as shown in FIGS. 5 and 7, a tire thickness detection system includes a tire pressure monitor 10, an ultrasonic sensor 20, and a control module 30.

The control module 30 includes:

The ultrasound control unit 306 is configured to control the ultrasound sensor 20 to emit ultrasound and receive the feedback signal sent by the ultrasound sensor 20.

The time unit 307 takes the time for controlling the ultrasonic sensor 20 to emit ultrasonic waves as the starting time; and the time for receiving the feedback signal sent by the ultrasonic sensor 20 as the ending time; based on the starting time and the ending time, The time difference between the start time and the end time is calculated; the time difference is used as the second time required for the round trip between the ultrasonic sensor 20 and the ground.

Preferably, the control module 30 further includes:

The time analysis unit 308 is used to analyze whether the second time already exists.

When there is no second time, the time unit 307 uses the time difference as the second time required for the round trip between the ultrasonic sensor 20 and the ground.

When the second time already exists, the time unit 307 analyzes whether the time difference is less than the second time.

When the time difference is less than the second time, the time unit 307 replaces the time difference with the second time.

When the control module 30 needs to detect the distance between the ultrasonic sensor 20 and the ground, the ultrasonic wave can start emitting ultrasonic waves to achieve distance measurement, and the time difference between the time when the ultrasonic wave is emitted and the time when the ultrasonic wave is received is used as the second time.

In this embodiment, by setting the start time and the end time, the second time required for the control module 30 to obtain the round trip of the ultrasonic wave between the ultrasonic sensor 20 and the ground can be achieved, and the monitoring process is relatively simple, and no other control is required operating.

Preferably, when the control module 30 acquires the time required for ultrasonic waves to travel between the ultrasonic sensor 20 and the ground multiple times during the monitoring process, the control module 30 can first analyze whether there is a second time, and when there is no second time, This indicates that this test is the first test, and the control module 30 can directly use the acquired time difference as the second time.

And when it is detected that there is a second time, this test is not the first side view. During the side view, the control module 30 cannot know whether the ultrasonic sensor 20 moves to the position directly below, that is, it cannot know whether the second time obtained by the previous test is required for the round trip between the ultrasonic sensor 20 and the ground The minimum time, therefore, the control module 30 can compare the second time with the time difference obtained in this test. When the time difference is less than the second time, the ultrasonic sensor 20 at the second time obtained before the surface is moved to the position directly below Therefore, the distance between the ultrasonic sensor 20 and the ground in this test state is smaller, and the time difference obtained in this test is taken as the second time.

When the time difference obtained in this test is greater than the second time, it indicates that the distance between the ultrasonic sensor 20 and the ground is greater than the distance between the ultrasonic sensor 20 and the ground when the second time is obtained during the test, so there is no need to replace The second time.

The control module 30 can be electrically connected to the speed sensor. Therefore, the control module 30 can obtain the running speed of the vehicle, and then calculate the rotation cycle of the tire.

When monitoring the time when the ultrasonic wave is transmitted between the ultrasonic sensor 20 and the ground, that is, the second time, it is difficult for the control module 30 to ensure that the ultrasonic sensor 20 is located at the lowermost end to start monitoring. To further increase the accuracy of the acquired second time.

The control module 30 can have a preset monitoring frequency built in. The preset monitoring frequency refers to the number of time monitoring in one rotation cycle of the tire. The preset monitoring frequency can be 5 to 10 times, and can be changed according to the needs of the user. Therefore, the monitoring frequency can be obtained by combining the obtained rotation cycle and the preset monitoring frequency, and the higher the preset frequency, the measured tire The accuracy of the second time is also higher, so the accuracy of the measured tire thickness is also higher, but the load on the control module 30 is also greater.

Preferably, the control module 30 can also set the total monitoring time or the number of monitoring or the monitoring period, and the tire thickness can be monitored within a certain period of time, which also reduces unnecessary waste, and the monitoring parameters can be carried out according to the needs of the user change.

According to yet another embodiment provided by the present invention, as shown in FIGS. 5 and 8, a tire thickness detection system includes a tire pressure monitor 10, an ultrasonic sensor 20, a control module 30, and a speed monitor 40.

The control module 30 is also used to depend on the tire propagation time and the second preset propagation speed.

The speed monitor 40 is used to monitor the speed of the vehicle and send the monitored speed of the vehicle to the control module 30.

The control module 30 includes:

The second receiving unit 309 receives the speed of the vehicle sent by the speed monitor 40.

The cycle analysis unit 310 calculates the rotation cycle of the tire according to the running speed of the vehicle and the type of the tire.

The frequency analysis unit 311 calculates the monitoring frequency according to the rotation period and the preset monitoring frequency.

The ultrasound control unit 306 is used to control the ultrasound sensor 20 to emit ultrasound.

When monitoring the time when the ultrasonic wave is transmitted between the ultrasonic sensor 20 and the ground, that is, the second time, it is difficult for the control module 30 to ensure that the ultrasonic sensor 20 is located at the lowermost end to start monitoring, therefore, the control module 30 can implement multiple monitoring To further increase the accuracy of the acquired second time.

It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made. These improvements and retouches also It should be regarded as the protection scope of the present invention.

Claims

A tire thickness detection method, which includes:

According to the monitored current tire pressure of the tire and the type of the tire, analyze and obtain the first time required for the ultrasonic wave to reach the tire from the ultrasonic sensor;

Obtain the second time required for ultrasonic waves to travel between the ultrasonic sensor and the ground;

Calculating the tire propagation time according to the first time and the second time;

According to the tire propagation time and the second preset propagation velocity, the thickness of the tire is calculated.
A tire thickness detection method according to claim 1, characterized in that, based on the monitored current tire pressure of the tire and the type of tire, the first A specific time includes:

Obtain the current tire pressure of the monitored tire;

According to the stored tire model, the deformation of the tire under the current tire pressure is analyzed;

According to the deformation amount of the tire and the initial distance between the ultrasonic sensor and the tire, the minimum distance between the ultrasonic sensor and the tire is analyzed and obtained;

Using the minimum distance as the first distance between the ultrasonic sensor and the tire;

According to the first preset propagation speed and the first distance, the first time required for the ultrasonic waves to reach the tire from the ultrasonic sensor is calculated.
The tire thickness detection method according to claim 1, wherein the step of acquiring the second time required for the ultrasonic wave to travel between the ultrasonic sensor and the ground specifically includes:

The ultrasonic sensor emits ultrasonic waves, and the time for transmitting the ultrasonic waves is used as the starting time;

When the ultrasonic sensor receives the reflected ultrasonic wave, the time of the received reflected ultrasonic wave is used as the termination time;

Calculating the time difference between the start time and the end time according to the start time and the end time;

Let the time difference be the second time required for the round trip between the ultrasonic sensor and the ground.
The tire thickness detection method according to claim 3, wherein after calculating the time difference between the start time and the end time according to the start time and the end time, the method further includes:

Analyze whether there is already a second time;

When there is no second time, perform the step of using the time difference as the second time required for the round trip between the ultrasonic sensor and the ground;

When the second time already exists, analyze whether the time difference is less than the second time;

When the time difference is less than the second time, the time difference is replaced with the second time.
The tire thickness detection method according to claim 1, characterized in that the step is based on the monitored current tire pressure of the tire and the type of the tire to analyze and obtain the ultrasonic wave required from the ultrasonic sensor to the tire After the first time, the step of acquiring ultrasonic waves before the second time required for the round trip between the ultrasonic sensor and the ground also includes:

Get the driving speed of the vehicle;

Calculate the rotation cycle of the tire according to the running speed of the vehicle and the type of the tire;

Based on the rotation period and the preset monitoring frequency, the monitoring frequency is calculated;

The ultrasonic sensor is controlled to emit ultrasonic waves according to the monitoring frequency.
A tire thickness detection system, characterized by comprising a tire pressure monitor, an ultrasonic sensor and a control module;

The tire pressure monitor can be used to monitor the current tire pressure of the tire and send the monitored current tire pressure to the control module;

The control module is used to analyze and obtain the first time required for ultrasonic waves to reach the tire from the ultrasonic sensor according to the current tire pressure of the tire and the type of the tire; and to control the ultrasonic sensor to emit ultrasonic waves;

The ultrasonic sensor is used to obtain the second time required for the ultrasonic wave to travel between the ultrasonic sensor and the ground, according to the first time and the second time, calculate the tire propagation time, and send the tire propagation time To the control module;

The control module is also used to calculate the thickness of the tire based on the tire propagation time and the second preset propagation velocity.
A tire thickness detection system according to claim 6, wherein the control module comprises:

A first receiving unit, configured to receive the current tire pressure of the tire sent by the tire pressure monitor;

Deformation storage unit, used to store the model of the tire and the deformation of the tire under various tire pressures;

The deformation analysis unit analyzes and obtains the deformation variable of the tire under the current tire pressure according to the stored tire model;

The distance analysis unit analyzes and obtains the minimum distance between the ultrasonic sensor and the tire based on the deformation amount of the tire and the initial distance between the ultrasonic sensor and the tire; the minimum distance is used as the ultrasonic sensor The first distance from the tire;

The time calculation unit calculates the first time required for ultrasonic waves to reach the tire from the ultrasonic sensor according to the first preset propagation speed and the first distance.
A tire thickness detection system according to claim 6, wherein the control module comprises:

An ultrasound control unit, configured to control the ultrasound sensor to emit ultrasound and receive the feedback signal sent by the ultrasound sensor;

The time unit takes the time for controlling the ultrasonic sensor to emit ultrasonic waves as the starting time; and the time for receiving the feedback signal sent by the ultrasonic sensor as the ending time; based on the starting time and the ending time, the The time difference between the start time and the end time; use the time difference as the second time required for the round trip between the ultrasonic sensor and the ground.
The tire thickness detection system according to claim 8, wherein the control module further comprises:

Time analysis unit, used to analyze whether the second time already exists;

When there is no second time, the time unit uses the time difference as the second time required for the round trip between the ultrasonic sensor and the ground;

When the second time already exists, the time unit analyzes whether the time difference is less than the second time;

When the time difference is less than the second time, the time unit replaces the time difference with the second time.
A tire thickness detection system according to claim 6, wherein:

It also includes a speed monitor, which is used to monitor the speed of the vehicle and send the monitored speed of the vehicle to the control module;

The control module includes:

The second receiving unit receives the speed of the vehicle sent by the speed monitor;

The cycle analysis unit calculates the rotation cycle of the tire according to the running speed of the vehicle and the type of the tire;

The frequency analysis unit calculates the monitoring frequency according to the rotation period and the preset monitoring frequency;

An ultrasonic control unit is used to control the ultrasonic sensor to emit ultrasonic waves.