WO2019127830A1

WO2019127830A1 - Tire monitoring method, slip rate calculation device, system, vehicle, and storage device

Info

Publication number: WO2019127830A1
Application number: PCT/CN2018/074829
Authority: WO
Inventors: 陈明星; 阳光; 李玥
Original assignee: 深圳配天智能技术研究院有限公司
Priority date: 2017-12-29
Filing date: 2018-01-31
Publication date: 2019-07-04
Also published as: WO2019127506A1; CN109843609A; CN109843609B

Abstract

A tire pressure monitoring method, comprising: collecting tire pressure information when a tire is rotating and in contact with the ground; acquiring the amount of deformation of the tire according to the tire pressure information; calculating the equivalent radius of the tire according to the amount of deformation; and calculating the slip rate of the tire according to the equivalent radius of the tire. Further disclosed are a calculation device for the tire slip rate, a vehicle anti-lock system, a vehicle comprising the anti-lock system and a device having a storage function.

Description

Tire monitoring method, slip ratio calculation device, system, vehicle, storage device

【技术领域】[Technical Field]

The invention relates to the technical field of tire information monitoring, in particular to a tire monitoring method, a slip ratio calculating device, a system, a vehicle and a storage device.

【背景技术】【Background technique】

With the development of society, the problem of traffic safety has become a big problem in the world, and the impact of the safety of automobiles on human life and property is self-evident. In the process of driving a car, the tire slip rate is too large. As the car is completely locked, or the tire slip rate is too small, the car can not stop the car, easily lead to the car out of control and cause traffic accidents, so car safe driving is getting more and more attention. Traditional passive safety is far from being able to avoid traffic accidents, so active safety has become more and more important.

【发明内容】 [Summary of the Invention]

Based on the above technical problems, the present invention provides a tire monitoring method, a slip ratio calculating device, a system, a vehicle, and a storage device, which are capable of knowing the tire slip ratio in time and alerting the driver to safe driving according to the slip ratio.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a tire information monitoring method, the method comprising:

Collecting tire pressure information when the tire is in contact with the ground during the rotation;

Obtaining a shape variable of the tire according to the tire pressure information;

Calculating an equivalent radius of the tire according to the shape variable;

The slip ratio of the tire is calculated based on the equivalent radius.

The application also provides a tire slip ratio calculation device, comprising:

The tire pressure information collecting module is configured to collect tire pressure information when the tire is in contact with the ground during the rotating process;

The calculation module is configured to acquire a deformation amount of the tire according to the tire pressure information, calculate an equivalent radius of the tire according to the deformation amount, and calculate a slip ratio of the tire according to the equivalent radius.

The present application also provides a vehicle anti-lock braking system including a tire slip ratio calculating device as described above.

The application also provides a vehicle, including a tire and a vehicle anti-lock braking system as described above.

The present application also provides a computer storage device storing program data that, when executed, implements the method as described above.

The present application calculates the tire radial pressure information when the tire is in contact with the ground, and calculates the equivalent radius of the tire based on the tire shape variable reflected by the tire pressure information, and finally calculates the slip ratio of the tire. According to the calculated slip rate, you can understand the safety factor of the tire. For example, when the slip ratio exceeds the safe range, the driver should be reminded to slow down to avoid the situation that the car is locked or difficult to brake, and the probability of a safety accident is reduced. .

【附图说明】 [Description of the Drawings]

1 is a partial cross-sectional structural view of an embodiment of a tire of the present application;

2 is a partial cross-sectional structural view of another embodiment of the present application;

3 is a schematic structural diagram of a sensor distribution in still another embodiment of the present application;

4 is a schematic flow chart of an embodiment of a tire pressure monitoring method of the present application;

5 is a schematic flow chart of another embodiment of a tire pressure monitoring method of the present application;

6 is a schematic flow chart of still another embodiment of a tire tire pressure monitoring method of the present application;

7 is a schematic flow chart of still another embodiment of a tire pressure monitoring method of the present application;

Fig. 8 is a schematic structural view of an embodiment of a tire slip ratio calculating device of the present application.

【具体实施方式】【Detailed ways】

The structure of the tire and the tire tire pressure monitoring method will be described below with reference to the embodiments through the accompanying drawings.

Referring to Figure 1, the tire 100 provided herein is applied to a vehicle. The inside of the tire 100 is provided with a plurality of piezoelectric film sensors 10 in the circumferential direction of the tire 100. Each piezoelectric film sensor 10 is used to detect tire pressure information on a segmented area of the tire 100 corresponding to its position, respectively.

Since the piezoelectric film sensor 10 can be powered by the piezoelectric current generated by its own deformation, it is not necessary to additionally supply power. The inconvenient operation of replacing the battery or charging the battery is omitted because the tire 100 is inconvenient to open once it is finished, and if it is opened, the tire 100 itself is damaged.

Specifically, the tire 100 includes a crown 20 having an outer surface provided with a plurality of tread patterns 22 disposed along the circumference of the tire 100. Further, the tread pattern 22 is divided into at least two sets of mutually parallel tread band belts 222 along the axial direction of the tire 100, and the tread pattern band 222 is laterally provided with a smoothing belt 242, that is, the outer surface is a smooth portion . The interior of the tire 100 includes a make layer 30, a crown protection layer 40 on the inside of the make layer 30, and a crown belt layer 50.

In one embodiment, the piezoelectric film sensor 10 is disposed at a position at least corresponding to one tread pattern 22 inside the tire 100 to detect tire tread information of the tread pattern 22 when the tread pattern 22 is deformed. As shown in Fig. 2, it is a tread pattern 22 on the surface of the crown 20. Further, in order to better detect the tire air pressure information throughout the tire 100, in another embodiment, a piezoelectric film sensor 10 is disposed at the position of each tread pattern 22. In this way, the tire pressure change of all the tread patterns 22 on the tire 100 can be detected, the data is more complete, and the state of the tire, the driving condition of the vehicle, and the road condition are determined based on the detected tire pressure information or the deformation information calculated by the tire pressure information. The accuracy. In each of the different embodiments, a piezoelectric film sensor 10 is not necessarily disposed on each of the tread patterns 22, and one of the plurality of tread patterns 22 may be disposed at a predetermined number, which is not specifically limited.

Specifically, in the present embodiment, the piezoelectric film sensor 10 is disposed between the tread pattern 22 and the primer layer 30. Thus, the piezoelectric film sensor 10 is closest to the tread pattern 22, and the detected tire pressure information is the most accurate. In other embodiments, the piezoelectric film sensor 10 can also be disposed between the crown protective layer 40 and the make layer 30. Or disposed between the crown protective layer 40 and the crown belt layer 50.

In one embodiment, a plurality of piezoelectric film sensors 10 may be provided in each of at least two tread band bands 222. Specifically, each tread pattern 22 on each tread band 222 is correspondingly provided with a piezoelectric film sensor 10, or a piezoelectric film sensor 10 is disposed at intervals of two or more tread patterns 22. Further, in another embodiment, the smoothing band 242 is also provided with a plurality of piezoelectric film sensors 10 in sections.

In the embodiment shown in FIG. 1, the smooth annulus 242 is located on both side edges of the crown 20 and the tread band 222 is located between the smooth annulus 242. Other embodiments may also be that the tread band 222 is located on either side of the crown 20, the smooth annulus 242 is located between the tread band 222, or the tread band 222 and the smooth annulus 242 are spaced apart.

Further referring to FIG. 3 is a schematic diagram of a distribution structure of a piezoelectric film. Corresponding to the embodiment shown in FIG. 1, in this embodiment, the tread pattern ring band 222 is provided with three groups, and the piezoelectric films 10 of the A area, the B area, and the C area shown in FIG. 3 are respectively disposed corresponding to the three sets of tires. The masked band 222 corresponds to the position. In another embodiment, FIG. 3 can also represent another distribution. For example, the piezoelectric films 10 of the A region and the C region are respectively disposed corresponding to the corresponding positions of the smoothing ring 242; the piezoelectric film 10 of the B region is correspondingly disposed at The tread pattern band 222 corresponds to the position.

Further, in the embodiment, the tire 100 further includes an information sampling module 70 and an information transmitting module 80 electrically connected to each other. As shown in FIG. 3, the piezoelectric film sensor 10 on the same endless belt is electrically connected by a wire 60 and electrically connected to the information sampling module 70. The information sampling module 70 is configured to collect the tire pressure information sequentially sent by the piezoelectric film sensor 10. . The information transmitting module 80 is configured to send the tire pressure information or the deformation information obtained by the tire pressure information to the outside. Specifically, the information collection module 70 and the information sending module 80 may be wired, or may be transmitted through Bluetooth or wireless signals.

It can be understood that, in other embodiments, the information collecting module 70 and the information transmitting module 80 may not be included, but the detected tire pressure information is transmitted by the piezoelectric film sensor 10 itself through Bluetooth or wireless signals.

The application adopts such a structural design, has the characteristics of simple structure, high integration, fast response, and no external power supply for detecting the tire pressure.

The application also provides a vehicle comprising the tire 100 described in the above embodiments.

The present application provides a piezoelectric film sensor 10 inside the tire 100. On the one hand, no external power supply is required when detecting the tire pressure of the tire 100, and deformation information obtained by calculating the tire pressure information or the tire pressure information can be calculated on the other hand. Determine the state of the tire, the driving situation of the vehicle, and the road conditions. Therefore, the use of the tire 100 can greatly increase driving safety.

Based on the structure of various tires provided by the above embodiments, the present application also provides a tire information monitoring method.

4 is a schematic flow chart of a tire tire pressure monitoring method according to an embodiment of the present application. The method includes the following steps:

S110: Collecting tire pressure information when the tire is in contact with the ground during the rotation.

Specifically, in different embodiments, it may be that tire pressure information of one or more positions of the tire is collected. It can be understood that, in one embodiment, only the tire pressure corresponding to a certain point in the tire is difficult to reflect the overall condition of the entire tire. Therefore, in this embodiment, the tire pressure of a plurality of segmented regions in the tire circumferential direction is counted. It is convenient to judge the state of the tire by means of averaging or comparison of each segment area. Specifically, in an embodiment, the step includes: detecting tire pressure information of the corresponding segment region by using a plurality of sensors disposed inside the tire and segmented. It can be understood that the specific sensor may be the piezoelectric film sensor in the tire of the above embodiment, or may be one or more of other pressure sensors or pressure transmitters.

Referring to FIG. 5, in another embodiment, step S110 specifically includes the following steps:

S1101: Select one tire segment in the tire as the measurement identification block.

Pick one of the tire segments as a node that counts the beginning and end of Monday. Specifically, one of the tread patterns can be selected as the measurement identification block by comparing the ring bands on the same circumference.

S1102: Start a current statistical period when the tire pressure information on the measurement identification block is greater than or equal to the threshold, and collect tire pressure information on the measurement identification block and tire pressure on other segment regions that are in contact with the ground following the rotation of the tire. information.

S1103: End the current statistical period when the tire pressure information on the measurement identification block is greater than or equal to the threshold again.

That is, when the corresponding tire pressure information on the measurement identification block of the tire is greater than or equal to the threshold value until the tire pressure information of the measurement identification block is greater than or equal to the threshold value, the tire is contacted with the bottom surface and rotated one time.

Specifically, in different embodiments, the tire pressure information when the tire collected in step S110 is in contact with the ground during the rotation may be tire pressure information at one position during tire rotation, or tire pressure information at multiple positions, or It is the tire pressure information collected by the tire rotating one week, and it can also be the tire pressure information collected by the tire rotating for many weeks.

S120: Obtain a shape variable of the tire according to the tire pressure information.

During the rotation of the tire, the part of the tire that is in contact with the ground is deformed to generate the tire pressure, so that the shape variable of the tire can be reversed according to the collected tire pressure information.

After the tire has been used for a period of time, the degree of friction between the various parts and the bottom surface is different, so the thickness of each part will also vary. Different thickness parts are different in shape and local pressure when the ground contacts, so the tire shape variable of each part can be reflected according to the tire pressure information of each part of the tire.

In an embodiment, step S120 may specifically be pre-storing a mapping relationship between a tire pressure size and a tire shape variable. Then, at the same time as or after counting the tire pressure information of each part of the tire, the corresponding tire shape variable can be searched from the pre-stored mapping relationship table according to the tire pressure information.

S130: Calculate the equivalent radius of the tire according to the shape variable calculation.

Specifically, each tire has a calibration radius, which is the calibration radius of the tire when it leaves the factory. Each tread pattern is part of the tire, that is, each tread pattern corresponds to a small arc length. When one or more tread patterns are subjected to ground pressure, a corresponding deformation occurs, according to which The shape variable of the tread pattern can be calculated to obtain the equivalent radius corresponding to the tread pattern. Specifically, during the rolling process of the tire, during the process of pressing each tread pattern on the ground, the deformation of the shape is a curve, which is gradually increased until the maximum shape variable. As the tire continues to roll, the contact position of the tire with the ground gradually The transition from the current tread pattern position to the next tread pattern, so the shape of the current tread pattern gradually decreases from the maximum. The shape variable used to calculate the equivalent radius is the largest shape variable of the tread pattern. Further, the equivalent radius is equal to the difference between the nominal radius minus the maximum shape variable of the corresponding tread pattern.

S140: Calculate the slip ratio of the tire according to the equivalent radius.

In one embodiment, the step of calculating the slip ratio of the tire based on the equivalent radius includes:

The slip ratio is calculated according to the following formula:

S = |R2-R1|/R2;

Where S is the slip ratio, R1 is the equivalent radius, and R2 is the nominal radius of the tire. The nominal radius of a tire refers to the distance from the center of the tire to the outer surface of the crown.

The present application calculates the tire tire pressure information when the tire is in contact with the bottom surface during the rotation of the tire, and calculates the equivalent radius of the tire based on the tire shape variable reflected by the tire pressure information, and finally calculates the slip ratio of the tire. According to the calculated slip rate, the safety factor of the tire can be understood. For example, when the slip ratio is greater than or equal to the preset threshold, the safety factor of the tire is low, there is a big safety hazard, and it needs to be repaired or replaced to reduce safety. The probability of an accident.

Referring to FIG. 6, in another embodiment, specifically, after calculating the slip ratio of the tire, the following steps are further included:

S210: Determine whether the slip ratio is in a first threshold range.

Specifically, if the slip ratio of the tire is too large, it means that the tire is easily locked and the lateral adhesion coefficient is small. For example, when the slip ratio of the tire is 100%, it means that the tire is completely locked, and the lateral adhesion coefficient is 0, that is, the tire is in operation, and only the sliding does not rotate. On the contrary, if the slip ratio of the tire is too low, the brake adhesion coefficient of the tire is low, and it is likely to be difficult to brake. For example, when the slip ratio of the tire is 0%, it means that the brake adhesion coefficient of the tire is 0, and the brake is disabled. Both of these situations are very dangerous situations, so the slip ratio needs to be kept within a safe threshold.

S220: If the slip ratio is not within the first threshold range, a danger alarm is issued.

When the tire is rubbed with the ground during the rotation process, one or more sections of the tire pressure information are abnormal, and finally it is reflected that the slip rate of the tire exceeds the first threshold range, and a dangerous alarm is issued, prompting the driver to drive. Safe, even repair or replace the tire.

Further, in still another embodiment, after calculating the slip ratio of the tire, the method further comprises: determining a state in which the tire is located or a driving road condition according to a difference in tire pressure information of the plurality of segment regions in the same tire. For example, when the tire is rotated one week, the tire pressure of each section on one side of each tire is significantly larger than the tire pressure on the other side of the tire, then it can be judged that the road surface is a slope, so that a reminder can be issued, for example : The section you are driving is a sloping section, please slow down and wait.

For another example, when the difference between the maximum tire pressure and the minimum tire pressure in the plurality of segmented regions in the tire is greater than or equal to a preset threshold, it is determined that the tire is partially damaged. It can prompt the tire to be partially damaged, or the partial damage will occur soon, please promptly replace the reminder.

Further, in still another embodiment, the driving condition can be identified by comparing the slip ratio or tire pressure information corresponding to the front and rear tires of the vehicle. For example, when a vehicle enters another type of road section from one type of road section, the road surface conditions of the front and rear road sections are different, and the measured tire pressure information is different, that is, the slip ratio is different. For example, when the vehicle is driven from a smooth road into a rough road, the tire pressure of the first two tires must be greater than the tire pressure of the two tires.

Further, the driving habits of the driver can be analyzed by analyzing the driving road conditions identified in the preset time period. Specifically, the preset time may be one month, three months, six months, or one year, depending on the actual situation. According to the analysis, the driver likes to drive on a rural dirt road, road, sand, or lawn, then the user can be pushed to the user through other systems or platforms.

In one embodiment, in order to make the resulting slip ratio more accurate, a plurality of sensors 10 may be segmented and looped at corresponding positions of the tread band 222 and/or the smoothing band 242 of the tire 100 to detect different The tire pressure information of each section of the belt is obtained, thereby obtaining the slip ratio of the different belts. Finally, the average of the slip ratios corresponding to the different zones is obtained to obtain the final slip ratio of the tire.

Referring to FIG. 7, in an embodiment, calculating the final slip ratio of the tire includes the following steps:

S310: Calculating a slip ratio corresponding to the tread pattern band 222

S320: Calculate the slip ratio corresponding to the smoothing zone 242

S330: Calculate the final slip ratio of the tire by the following formula:

S3=S1×(1/A)+ S2×(1/B)

Where S1 is the slip ratio corresponding to the tread pattern band 222, S2 is the slip ratio corresponding to the smooth band 242, A is the standard pressure value of the tread band 222, and B is the standard of the smooth band 242. Pressure value. Specifically, the standard pressure values of the tread band 222 and the smoothing band 242 are determined when the tire is shipped from the factory.

In the prior art, a method of indirectly calculating a slip ratio by using a combination of a wheel speed sensor and an acceleration sensor is mainly used. The system device using the combination of the wheel speed sensor and the acceleration sensor is relatively scattered, which easily leads to the signal transmission delay. Therefore, the tire slip ratio calculated by the present application is more rapid and accurate, and is more responsive to various aspects of the tire.

Further, referring to FIG. 8 , the present application further provides a tire slip ratio calculating device 200 , which includes a tire pressure information collecting module 90 and a calculating module 91 electrically connected to each other. Specifically, the tire pressure information collecting module 90 is configured to collect tire pressure information when the tire is in contact with the ground during the rotation process. The calculation module 91 is configured to acquire a deformation amount of the tire according to the tire pressure information, calculate an equivalent radius of the tire according to the deformation amount, and calculate a slip ratio of the tire according to the equivalent radius.

The present application also provides a vehicle anti-lock braking system including a tire slip ratio calculating device as described in the above embodiments.

A vehicle in an embodiment of the present application includes a tire and the vehicle anti-lock brake system. Specifically, in an embodiment, a plurality of piezoelectric film sensors are disposed inside the tire along the circumferential direction of the tire, and each piezoelectric film sensor is respectively used to detect the segmented area of the tire corresponding thereto. Tire pressure information. In turn, the tire pressure information throughout the tire can be obtained in a timely and comprehensive manner during the tire rotation process. The collected tire pressure information is more accurate and comprehensive.

Further, the present application also provides an apparatus having a storage function, the apparatus storing program data, wherein the program data is executed to implement the method as described in any of the above embodiments. Optionally, the device having the storage function may be one of an in-vehicle device, a personal computer, a server, a network device, or a USB flash drive.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A tire information monitoring method, characterized in that the method comprises:

Collecting tire pressure information when the tire is in contact with the ground during the rotation;

Obtaining a shape variable of the tire according to the tire pressure information;

Calculating an equivalent radius of the tire according to the shape variable;

The slip ratio of the tire is calculated based on the equivalent radius.
The tire information monitoring method according to claim 1, wherein the tire tire pressure information when the tire is in contact with the ground during the rotation process comprises:

The tire pressure information of the corresponding segmented region is detected by a plurality of sensors located inside the tire and segmented.
The tire information monitoring method according to claim 1, wherein the obtaining a shape variable of the tire according to the tire air pressure information comprises:

The tire shape variable corresponding to the tire pressure is obtained by searching the pre-stored mapping relationship table according to the tire pressure information.
The tire information monitoring method according to claim 1, wherein the calculating the slip ratio of the tire according to the equivalent radius comprises:

The slip ratio is calculated according to the following formula:

S = |R2-R1|/R2;

Where S is the slip ratio, R1 is the equivalent radius, and R2 is the nominal radius of the tire.
The tire information monitoring method according to claim 1, wherein the calculating the slip ratio of the tire according to the equivalent radius further comprises:

Determining whether the slip ratio is within a first threshold range;

A hazard alert is issued if the slip ratio is not within the first threshold range.
The tire information monitoring method according to claim 1, wherein the calculating the slip ratio of the tire according to the equivalent radius further comprises:

The slip ratio or tire pressure information corresponding to the front and rear tires of the vehicle is compared to identify the driving road condition.
The tire information monitoring method according to claim 6, wherein the calculating the slip ratio of the tire according to the equivalent radius further comprises: counting driving road conditions identified in the preset time period, and analyzing driving habits of the driver .
The tire information monitoring method according to claim 1, wherein the method further comprises:

The state of the tire or the driving road condition is judged based on the difference in the tire pressure information of the plurality of segmented regions in the same tire.
The tire information monitoring method according to claim 8, wherein the difference in tire pressure information based on the plurality of segment regions in the same tire to determine the state in which the tire is located or the driving road condition includes:

If the difference between the maximum tire pressure and the minimum tire pressure in the plurality of segment regions is greater than or equal to a preset threshold, it is determined that the tire is partially damaged.
The tire information monitoring method according to claim 1, wherein the calculating a slip ratio of the tire according to the equivalent radius comprises:

The slip ratios corresponding to the different annuluses disposed parallel to each other along the axial direction of the tire are calculated based on the equivalent radius, and averaged to obtain a final slip ratio.
The tire information monitoring method according to claim 10, wherein said endless belt comprises a tread band and a smoothing belt, said calculating according to said equivalent radius being parallel to each other along an axial direction of said tire The slip ratio corresponding to the different zones and averaged to obtain the final slip ratio includes:

Calculating the slip ratio corresponding to the tread band;

Calculating the slip ratio corresponding to the smoothing band;

Calculate the final slip ratio of the tire by the following formula:

S3=S1×(1/A)+ S2×(1/B);

Where S1 is the slip ratio corresponding to the tread band, S2 is the slip ratio corresponding to the smooth band, A is the standard pressure value of the tread band, and B is the smooth band Standard pressure value.
The tire information monitoring method according to claim 1, wherein the tire tire pressure information when the tire is in contact with the ground during the rotation process comprises:

Selecting one of the tire segments as the measurement identification block;

Generating a current statistical period when the tire pressure information on the measurement identification block is greater than or equal to a threshold value, and collecting tire pressure information on the measurement identification block and other points that are in contact with the ground following the rotation of the tire Tire pressure information on the segment area;

When the tire pressure information on the measurement identification block is again greater than or equal to the threshold, the current statistical period is ended.
A tire slip ratio calculating device, comprising:

The tire pressure information collecting module is configured to collect tire pressure information when the tire is in contact with the ground during the rotating process;

And a calculating module, configured to acquire a deformation variable of the tire according to the tire pressure information, calculate an equivalent radius of the tire according to the deformation variable, and calculate a slip ratio of the tire according to the equivalent radius.
A vehicle anti-lock braking system, comprising the tire slip ratio calculating device according to claim 13.
A vehicle characterized by comprising a tire and the vehicle anti-lock brake system of claim 14.
The vehicle according to claim 15, wherein said tire interior is provided with a plurality of piezoelectric film sensors along a circumferential direction of said tire, each of said piezoelectric film sensors being respectively used for detecting a corresponding one thereof Tire pressure information on the segmented area of the tire.
A device having a storage function, characterized in that program data is stored, and when the program data is executed, the method according to any one of claims 1 to 12 is implemented.