CN115752856A

CN115752856A - Tire grounding pressure detection method and system and vehicle

Info

Publication number: CN115752856A
Application number: CN202211577175.XA
Authority: CN
Inventors: 钟浩龙; 孙猛; 徐婷
Original assignee: Ji Hua Laboratory
Current assignee: Ji Hua Laboratory
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-03-07

Abstract

The present disclosure relates to a tire ground contact pressure detection method, system and vehicle, wherein the method comprises: acquiring a sensing signal of a piezoresistor matrix in a tire; determining the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix according to the sensing signal of the piezoresistor matrix; wherein the tyre is provided with a plurality of piezoresistive matrices; a plurality of varistor matrices arranged in the circumferential direction of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix. The real-time accurate detection of the stress condition of each point in the grounding range of the tire in the running process is realized.

Description

Tire grounding pressure detection method and system and vehicle

Technical Field

The disclosure relates to the technical field of tire performance testing, in particular to a method and a system for detecting tire ground contact pressure and a vehicle.

Background

The tire is used as the only part of the whole vehicle contacting with the ground, and the stress condition of the tire in the running process of the vehicle determines the performance of the whole vehicle to a certain extent. Various forces with the road surface during the running of the vehicle act on the contact area between the tire and the road surface, so that it is important to analyze the distribution of the contact pressure in the contact area of the tire.

However, the prior art tests for the ground contact pressure of the tire generally achieve non-contact measurement of the ground contact pressure of the tire by indirect means, such as by using a non-contact measurement bench. Although the prior art realizes the measurement of the tire grounding pressure, an additional measuring device is needed, and the grounding pressure of the tire in a static state can be measured only, so that the application range of the tire grounding pressure measuring device is greatly limited.

Disclosure of Invention

In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a tire ground contact pressure detection method, a system and a vehicle.

The present disclosure provides a tire ground contact pressure detection method, including:

acquiring a sensing signal of a piezoresistor matrix in a tire;

determining the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix;

wherein the tyre is provided with a plurality of said piezoresistive matrices; a plurality of the piezoresistor matrices are arranged along the circumferential direction of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix.

Optionally, before the acquiring the sensing signal of at least one piezoresistor matrix in the tire, the method includes:

identifying a vehicle travel direction based on a vehicle travel state;

the acquiring sensing signals of the piezoresistor matrix in the tire comprises the following steps:

sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction;

after each row of piezoresistors is powered, a sensing signal of each column of the piezoresistors in the row is acquired.

Optionally, the vehicle driving direction is a forward direction; the step of sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction comprises the following steps:

and sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the forward row serial number power supply sequence corresponding to the forward direction.

Optionally, the vehicle driving direction is a reversing direction; the step of sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction comprises the following steps:

and sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the reverse row serial number power supply sequence corresponding to the reversing direction.

Optionally, the method further includes:

obtaining the rotating speed of the tire;

and determining the power supply frequency of the piezoresistor matrix according to the tire rotating speed and the matrix row number of the piezoresistor matrix.

Optionally, after determining the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix, the method further includes:

and generating a tire state adjusting signal according to the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix.

The embodiment of the present disclosure further provides a tire ground pressure detection system, including:

a plurality of piezoresistive matrices and a processing module;

a plurality of the piezoresistor matrixes are positioned in the tire and arranged along the circumferential direction of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix; the piezoresistor matrix is used for acquiring sensing signals of matrix points in a corresponding grounding range;

the processing module is used for determining the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix according to the sensing signal of the piezoresistor matrix.

Optionally, the piezoresistors in the same row in the piezoresistor matrix are connected in series; the piezoresistors in the same column in the piezoresistor matrix are connected in series.

Optionally, a diode is arranged between adjacent piezoresistors in the same row; diodes are arranged between adjacent piezoresistors in the same column; the conducting directions of the diodes in the same row are the same; the conducting directions of the diodes in the same column are the same.

Optionally, the voltage-dependent resistor matrix further comprises a power supply module, and the power supply module is electrically connected with each voltage-dependent resistor in the voltage-dependent resistor matrix.

Optionally, the power supply module includes a power supply, a rotation speed sensor and a processing unit; the rotating speed sensor is used for acquiring the rotating speed of the tire; the processing unit is used for determining power supply frequency of the piezoresistor matrix according to the tire rotating speed and the matrix row number of the piezoresistor matrix, and sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction based on the power supply frequency.

Optionally, the processing module includes a detection recording unit and a vehicle-mounted unit;

the detection recording unit is used for acquiring and recording the sensing signal and sending the sensing signal to the vehicle-mounted unit; and the vehicle unit is used for determining the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix according to the sensing signal of the piezoresistor matrix.

The present disclosure also provides a vehicle including the tire ground pressure detection system.

Compared with the prior art, the technical scheme provided by the disclosure has the following advantages: the utility model provides a tire ground pressure detection method, which comprises the steps of obtaining a sensing signal of a piezoresistor matrix in a tire; determining the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix; wherein the tyre is provided with a plurality of said piezoresistive matrices; a plurality of the piezoresistor matrices are arranged along the circumferential direction of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix. . By adopting the technical scheme, the sensing signals can be obtained in real time through the piezoresistor matrix in the tire, so that the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix can be dynamically determined in real time according to the obtained sensing signals, and detection is not required to be carried out through an additional measuring device. In addition, the piezoresistors in the embodiment of the disclosure are arranged in a matrix to form a piezoresistor matrix, so that the grounding pressure of each position in the tire grounding range can be more accurately obtained, and further, the real-time accurate detection of the stress condition of each point in the tire grounding range in each state is realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the embodiments or technical solutions in the prior art description will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic flow chart of a method for detecting a tire ground contact pressure according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a varistor matrix according to an embodiment of the present disclosure;

FIG. 3 is a schematic side view of a tire according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a partial cross-sectional structure of a tire provided in accordance with an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a tire ground contact pressure detection system provided in an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a further tire ground contact pressure detection system provided in the embodiment of the present disclosure.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

The tire is used as the only part for contacting the whole vehicle with the ground, and the stress condition of the tire in the running process of the vehicle determines the performance of the whole vehicle to a certain extent. Various acting forces with the road surface during the running process of the vehicle act on the contact area between the tire and the road surface, so that the real-time dynamic analysis of the distribution of the contact pressure in the contact area of the tire is particularly important. In view of the above technical problems, the present disclosure provides a method for detecting a tire ground contact pressure, which can accurately detect the stress condition of each point in a ground contact range of a tire under a dynamic condition in real time, and is described below with reference to specific embodiments.

Fig. 1 is a schematic flow chart of a method for detecting a ground contact pressure of a tire according to an embodiment of the present disclosure, as shown in fig. 1 and fig. 2, the method includes:

step 101, acquiring a sensing signal of a piezoresistor matrix in the tire.

In particular, at least one piezoresistive matrix 201 may be provided within the tyre. The varistor matrix 201 includes a plurality of varistors 202 arranged in a matrix. The exemplary arrangement of the varistor matrix 201 of fig. 2 comprises 4 rows and 5 columns of 20 varistors 202. The plane of the matrix arrangement may be parallel to the tread of the tire. One piezo-resistor 202 is provided per matrix point. When the tire contacts with the ground to generate the ground contact pressure, each piezo-resistor 202 of the piezo-resistor matrix 201 can sense the sensing signal generated by the contact of the tire with the ground.

Alternatively, as shown in fig. 3 and 4, for a non-pneumatic tire, a plurality of piezoresistor matrices 201 can be uniformly arranged under the tread 203 along the tire circumferential direction. For pneumatic tires, the piezoresistive matrix 201 may be disposed under the tread, and may also be disposed on the belt, carcass, or tire interior surfaces of the tire, as the case may be.

Step 102, determining the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix 201.

Based on this, the present disclosure can realize real-time dynamic detection of the tire ground contact pressure without adopting an additional measuring device by providing the piezoresistor matrix 201 in the tire. Since each piezoresistor 202 of the piezoresistor matrix 201 can detect the sensing signal when the tire is in contact with the ground in real time, the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix 201 can be determined according to the sensing signal. Therefore, the pressure sensitive resistor matrix 201 formed by arranging and combining a plurality of pressure sensitive resistors 202 can be arranged, so that the stress condition of each matrix point in the tire grounding range can be accurately detected.

Specifically, when the tire contacts with the ground to generate the ground contact pressure, the piezoresistor 202 in the present disclosure receives different ground contact pressures, and the resistance values thereof are different, and after power is supplied thereto, the generated sensing signals are also different, so that the ground contact pressure of the tire can be calculated accordingly.

In some embodiments, before acquiring the sensing signals of the piezoresistive matrix 201 in the tire, the method includes:

identifying a vehicle travel direction based on the vehicle travel state;

accordingly, acquiring the sensing signal of the piezoresistor matrix in the tire comprises: sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction; after each row of piezoresistors is powered, a sensing signal of each column of the piezoresistors in the row is acquired.

Specifically, the vehicle can be divided into two driving directions of forward driving and backward driving, when the vehicle is in different driving directions, the rotation direction of the tire is different, and therefore the sequence of the contact of the piezoresistors 202 on the tire with the ground is different, so before the sensing signals of the piezoresistor matrix 201 in the tire are acquired, the driving direction of the vehicle is firstly judged, and power is supplied to each row of piezoresistors 202 in sequence according to the driving direction of the vehicle. When power is applied to each row of piezoresistors 202, a sensing signal is obtained for each column of the row of piezoresistors.

According to the embodiment of the disclosure, the power is supplied to each row of the piezoresistors 202 of the piezoresistor matrix 201 in sequence based on the vehicle running direction, so that the problem of the ground pressure detection error caused by the fact that the contact sequence of the piezoresistors 202 and the ground is different from the power supply sequence can be avoided.

In some embodiments, if the vehicle driving direction is a forward direction, the sequentially supplying power to each row of the piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle driving direction comprises:

For example, the driving direction of the vehicle is first determined before the sensing signals of the piezoresistor matrix 201 in the tire are acquired, and if the driving direction of the vehicle is the forward direction, the rotating direction of the tire is counterclockwise. The piezoresistors 202 in each row of the piezoresistor matrix 201 are marked with row numbers in the counterclockwise direction, and the counterclockwise direction is defined as the positive direction of the row numbers of the piezoresistor matrix 201. When the vehicle running direction is a forward direction, each row of the piezoresistors 202 of the piezoresistor matrix 201 is sequentially supplied with power according to a forward row sequence number power supply sequence, namely, when the vehicle running direction is the forward direction, each row of the piezoresistors 202 of the piezoresistor matrix 201 is sequentially supplied with power according to a counterclockwise direction.

In some embodiments, if the vehicle driving direction is a reverse direction, the sequentially supplying power to each row of the piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle driving direction correspondingly comprises:

For example, the driving direction of the vehicle is first determined before the sensing signals of the piezoresistor matrix 201 in the tire are acquired, and if the driving direction of the vehicle is the reverse direction, the rotating direction of the tire is clockwise. The piezoresistors 202 in each row of the piezoresistor matrix 201 are marked with row serial numbers in the counterclockwise direction, the counterclockwise direction is defined as the forward direction of the row serial numbers of the piezoresistor matrix 201, and the forward direction is defined as the reverse direction of the row serial numbers of the piezoresistor matrix 201. When the vehicle driving direction is the reverse direction, each row of the piezoresistors 202 of the piezoresistor matrix 201 is sequentially supplied with power according to the reverse row sequence number power supply sequence, that is, when the vehicle driving direction is the reverse direction, each row of the piezoresistors 202 of the piezoresistor matrix 201 is sequentially supplied with power according to the clockwise direction.

Taking fig. 2 as an example, the piezoresistor matrix 201 is a matrix structure formed by 4 rows and 5 columns of piezoresistors 202. Wherein 4 rows are arranged in the tire rolling direction and 5 columns are arranged in the tire axial direction. Wherein the X and Y directions are referenced to SAE (Society of Automotive Engineers) coordinate system. The X-axis is along the direction of the intersection of the wheel plane and the road plane, also called the contact line. The positive direction of X represents the direction in which the tire is rolling. The Y-axis is along the projection of the wheel axis onto the road plane. The positive direction of Y is to the right when looking in the positive direction of X at the rear side of the coordinate system. If the vehicle driving direction is the advancing direction, power is supplied in a single row along the direction of the 1 st row, the 2 nd row, the 3 rd row and the 4 th row. If the vehicle running direction is the reversing direction, power is supplied to the vehicle in a single row in sequence along the 4 th row-3 rd row-2 nd row-1 st row direction, and when power is supplied to one row, the rest rows are not supplied with power.

In some embodiments, further comprising:

obtaining the rotating speed of the tire;

Specifically, as power needs to be supplied at least once in the corresponding grounding range of the piezoresistor matrix, the faster the tire rotating speed is in the running process of the vehicle, the higher the power supply frequency of the piezoresistor matrix is; the larger the number of rows of the varistor matrix 201, the larger the supply frequency of the varistor matrix. For example, the power supply frequency of the varistor matrix may be positively correlated with the product of the tire rotation speed and the number of matrix rows of the varistor matrix 201. The rotation time t = 1/(2 pi λ) of the tire per unit angle, then the supply frequency f of the piezoresistor matrix can be set to be not less than 2 pi λ m in order to supply power to the piezoresistor matrix at least once corresponding to the grounding range. Where t is the rotation time of the tire in a unit angle, λ is the tire rotation speed, m is the number of rows of the piezoresistor matrix 201, and f is the power supply frequency of the piezoresistor matrix.

Still taking fig. 2 as an example, when power is supplied to the row 1 piezoresistor 202, the sensing signals I11, I21, I31, I41, I51 of each column of the row piezoresistor 202 can be obtained. Wherein I11 is a sensing signal of the piezoresistor in the 1 st column obtained by supplying power to the piezoresistor in the 1 st row; i21 is a sensing signal of a piezoresistor in a 2 nd column, which is obtained by supplying power to the piezoresistor in the 1 st row; i31 is a sensing signal of a piezoresistor in a 3 rd column obtained by supplying power to the piezoresistor in the 1 st row; i41 is a sensing signal of a piezoresistor in a 4 th column obtained by supplying power to the piezoresistor in the 1 st row; i51 is a sensing signal of a piezoresistor of a 5 th column obtained by supplying power to the piezoresistor of the 1 st row. When power is supplied to the row 2 piezo-resistor 202, the sense signals I12, I22, I32, I42, I52 for each column of the row piezo-resistor 202 may be obtained. I12 is a sensing signal of a piezoresistor in a 1 st column, which is obtained by supplying power to the piezoresistor in the 2 nd row; i22, supplying power to the piezoresistor in the 2 nd row to obtain a sensing signal of the piezoresistor in the 2 nd column; i32 is a sensing signal of a piezoresistor in a 3 rd column obtained by supplying power to the piezoresistor in the 2 nd row; i42, supplying power to the piezoresistor in the 2 nd row to obtain a sensing signal of the piezoresistor in the 4 th column; i52 is a sensing signal of a piezoresistor of a 5 th column obtained by supplying power to the piezoresistor of the 2 nd row. When power is supplied to the row 3 piezoresistor 202, the sensing signals I13, I23, I33, I43, I53 of each column of the row piezoresistor 202 can be obtained. I13 is a sensing signal of a piezoresistor in a 1 st column, which is obtained by supplying power to the piezoresistor in the 3 rd row; i23, supplying power to the piezoresistor in the 3 rd row to obtain a sensing signal of the piezoresistor in the 2 nd row; i33 is a sensing signal of a piezoresistor in a 3 rd column obtained by supplying power to the piezoresistor in the 3 rd row; i43 is a sensing signal of a piezoresistor in a 4 th column, which is obtained by supplying power to the piezoresistor in the 3 rd row; i53 is a sensing signal of a piezoresistor of a 5 th column obtained by supplying power to the piezoresistor of the 3 rd row. When power is supplied to the row 4 piezo-resistor 202, the sense signals I14, I24, I34, I44, I54 for each column of the row piezo-resistor 202 may be obtained. I14 is a sensing signal of the piezoresistor in the 1 st column, which is obtained by supplying power to the piezoresistor in the 4 th row; i24, supplying power to the piezoresistor in the 4 th row to obtain a sensing signal of the piezoresistor in the 2 nd row; i34, supplying power to the piezoresistor in the 4 th row to obtain a sensing signal of the piezoresistor in the 3 rd column; i44 is a sensing signal of a piezoresistor in a 4 th column obtained by supplying power to the piezoresistor in the 4 th row; i54 is a sensing signal of the piezoresistor of the 5 th column obtained by supplying power to the piezoresistor of the 4 th row. The embodiment of the disclosure may determine the grounding pressure of each matrix point according to the supply voltage, I11, I21, I31, I41, I51, I12, I22, I32, I42, I52, I13, I23, I33, I43, I53, I14, I24, I34, I44, I54.

Therefore, the piezoresistor is subjected to the change of the piezoresistor, and the specific relation exists between the magnitude of the resistance value R and the magnitude of the received pressure F, namely the resistance value R can be obtained according to the magnitude of the received pressure F, and the pressure F can also be obtained by reversing the magnitude of the resistance value R. When the set power supply voltage is provided, the sensing signal is a current signal, the current resistance value can be known by the current signal, and the grounding pressure can be calculated based on the current resistance value.

If the piezoresistors in the same row in the piezoresistor matrix are connected in series; the piezoresistors in the same column in the piezoresistor matrix are connected in series. In the above manner, when power is supplied to the 1 st row, R11 (the resistance of the 1 st row and 1 st column piezoresistors) is known by the current signal I11, and further the grounding pressure F11 at the matrix point where the 1 st row and 1 st column piezoresistors are located can be calculated according to the relationship between the resistance and the pressure. F12 (the grounding pressure of the piezoresistor in the 1 st row and the 2 nd column at the matrix point) can be obtained through the current signals I11 and I12, and the like until F15 (the grounding pressure of the piezoresistor in the 1 st row and the 5 th column at the matrix point) is obtained. When power is supplied to the 2 nd row, current is output from the 2 nd row piezoresistor through the 1 st row piezoresistor, current signals I12, I22, I32, I42 and I52 of each column are obtained, and Fi2 can be determined according to I11, I21, I31, I41, I51, I12, I22, I32, I42 and I52. Fi2 is grounding pressure at a matrix point where piezoresistors in the ith row and the ith column of the 2 nd row are located. i is a positive integer from 1 to 5. And the like, so that the grounding pressure of each matrix point in the accurate grounding range can be obtained.

In some embodiments, after determining the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix, the method further includes:

Specifically, the ground contact pressure within the ground contact area directly affects the tire performance, such as the performance characteristics of the tire, such as wear, traction, braking, handling, and rolling resistance. Therefore, after the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix is determined, the tire state adjusting signal can be generated according to the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix, so that the grounding state of the tire is adjusted, and the applicable performances of abrasion, operation stability and the like of the tire are improved. In addition, each piezoresistor in the piezoresistor matrixes is in a real-time high-frequency sampling state in the grounding area, so that the piezoresistor matrixes can detect the grounding area and the grounding pressure of the tire in the driving process more timely and accurately, the grounding state of the tire can be accurately acquired under any complex road condition or driving condition, the grounding state of the tire is adjusted, and the use performance of the tire is improved.

For example, after the ground contact pressure of each matrix point in the ground contact range corresponding to the piezoresistor matrix is determined, a corresponding wheel angle adjusting signal can be generated through the analysis of the tire ground contact pressure, the toe angle δ or the roll angle γ of the wheel is adjusted through the adjusting mechanism, and the ground contact state of the tire is adjusted through the adjustment of the toe angle δ or the roll angle γ, so that the application performances of abrasion, operation stability and the like of the tire are improved. For the pneumatic tire, the change of the tire pressure has great influence on both the tire grounding area and the grounding pressure, the tire pressure is large, the grounding area is small, the ground gripping performance is reduced, the tire pressure is small, the grounding area is increased, and the rolling resistance is correspondingly increased, so that after the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix is determined, a corresponding tire state adjusting signal (such as a tire pressure adjusting signal) can be generated through analyzing the tire grounding pressure, the tire pressure of the tire is adjusted through an adjusting mechanism, the stability of the tire pressure is maintained, and the performance of the tire is ensured.

Based on the same inventive concept, the present disclosure further provides an exemplary tire ground contact pressure detection system, as shown in fig. 5, fig. 5 is a schematic structural diagram of a tire ground contact pressure detection system provided in an embodiment of the present disclosure, and the system includes:

a plurality of varistor matrices 201 and a processing module 204;

a plurality of piezoresistor matrixes 201 are positioned in the tire and arranged along the circumferential direction of the tire; the varistor matrix 201 includes a plurality of varistors arranged in a matrix; the piezoresistor matrix 201 is used for acquiring sensing signals corresponding to matrix points in a grounding range;

the processing module 204 is configured to determine a grounding pressure of each matrix point in a grounding range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix.

The piezoresistor matrixes are arranged along the circumferential direction of the tire, and the arrangement mode of the piezoresistors in each piezoresistor matrix 201 can be seen from the figure 2, for example, and each piezoresistor matrix 201 is composed of a plurality of piezoresistors 202 arranged in a matrix. The processing module 204 is configured to determine a grounding pressure of each matrix point in a grounding range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix. According to the arrangement, the stress condition of each point in the grounding range of the tire under various state conditions can be accurately detected.

In some embodiments, the piezoresistors in the piezoresistor matrix can be independent of each other, that is, after power is supplied to each piezoresistor, each piezoresistor outputs a sensing signal independently.

In some embodiments, the piezoresistors in the same row in the piezoresistor matrix are connected in series; the piezoresistors in the same column in the piezoresistor matrix are connected in series. According to the arrangement connection mode of the piezoresistors, the sensing signals of the piezoresistors in the next row are influenced by the sensing signals of the piezoresistors in the previous row, and the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix can be calculated based on the sensing signals output by the piezoresistors in each row.

In some embodiments, diodes are arranged between adjacent piezoresistors in the same row; diodes are arranged between adjacent piezoresistors in the same column; the conducting directions of the diodes in the same row are the same; the conducting directions of the diodes in the same column are the same.

Specifically, as shown in fig. 2, diodes are disposed between adjacent piezoresistors in the same row, and the conduction directions of the diodes in the same row are the same, so that the current can only flow in one direction between the rows; the diodes are arranged between the adjacent piezoresistors in the same row, the conduction directions of the diodes in the same row are the same, the current can only flow in a single direction between the rows, and the accuracy of the grounding pressure detection is further ensured. As shown in fig. 2, diodes are placed between adjacent piezoresistors in each row, which ensures that current can only flow in one direction, e.g., in the positive Y-axis direction, between each row. And a diode is arranged between every two adjacent piezoresistors, so that the current can only flow in one direction between every two adjacent piezoresistors, and the current flows in the positive direction of the X axis between every two adjacent piezoresistors when power is supplied.

In some embodiments, referring to fig. 6, the tire ground contact pressure detection system further comprises a power module 205 electrically connected to each piezoresistor in the piezoresistor matrix 201. The power supply module is used for supplying power to each piezoresistor in the piezoresistor matrix.

Optionally, the processing module may also identify a vehicle driving direction based on the vehicle driving state,

the power supply module can sequentially supply power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction; after each row of piezoresistors is powered, the processing module acquires the sensing signal of each column of the piezoresistors in the row, so that the processing module can determine the grounding pressure of each matrix point in the corresponding grounding range of the piezoresistor matrix according to the sensing signal of the piezoresistor matrix. Specifically, when the vehicle runs, the vehicle can be divided into two running directions of forward running and backward running, when the vehicle is in different running directions, the rotation directions of tires are different, the contact sequence of the piezoresistors 202 on the tires is different, and therefore, in order to avoid ground contact pressure detection errors caused by the fact that the piezoresistors 202 and the contact sequence of the ground are different from the power supply sequence, the vehicle running direction can be preferentially judged before the sensing signal of at least one piezoresistor matrix 201 in the tires is acquired, and power is supplied to each row of piezoresistors 202 sequentially through the power supply module 205 according to the vehicle running direction.

Specifically, the power supply module is further configured to sequentially supply power to each row of the piezoresistors 202 of the piezoresistor matrix 201 according to the forward row sequence number power supply sequence corresponding to the forward direction.

Specifically, the power supply module is further configured to sequentially supply power to each row of the piezoresistors 202 of the piezoresistor matrix 201 according to a reverse row sequence number power supply sequence corresponding to the reversing direction.

In some embodiments, referring to fig. 6, the power module 205 may further include a power supply 2051, a tachometer sensor 2052, and a processing unit 2053. The power supply 2051 is used for supplying power to the rotation speed sensor 2052, the processing unit 2053 and the piezoresistor matrix 201. The rotation speed sensor 2052 is used to acquire the tire rotation speed. The processing unit 2053 is configured to determine a power supply frequency for the piezoresistive matrix according to the tire rotation speed and the number of rows of the piezoresistive matrix, and sequentially supply power to each row of the piezoresistive matrix according to a power supply sequence corresponding to the vehicle driving direction based on the power supply frequency.

Specifically, as the power needs to be supplied at least once in the corresponding grounding range of the piezoresistor matrix, the faster the tire rotating speed is in the running process of the vehicle, the higher the power supply frequency of the piezoresistor matrix is; the larger the number of matrix rows of the varistor matrix 201, the larger the supply frequency of the varistor matrix. For example, the power supply frequency of the varistor matrix may be positively correlated with the product of the tire rotation speed and the number of matrix rows of the varistor matrix 201. The rotation time t = 1/(2 pi λ) of the tire per unit angle, then the supply frequency f of the piezoresistor matrix can be set to be not less than 2 pi λ m in order to supply power to the piezoresistor matrix at least once corresponding to the grounding range. Where t is the rotation time of the tire in a unit angle, λ is the tire rotation speed, m is the number of rows of the piezoresistor matrix 201, and f is the power supply frequency of the piezoresistor matrix.

It should be noted that the power supply module 205 may be disposed in a tire, or may be disposed outside the tire, and the disposition position of the power supply module 205 is not limited in the embodiment of the present disclosure.

In some embodiments, referring to fig. 6, the processing module 204 includes a detection recording unit 2041 and a car machine unit 2042;

the detection recording unit 2041 is used for acquiring and recording the sensing signal, and sending the sensing signal to the vehicle unit; the in-vehicle unit 2042 is configured to determine the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistive matrix according to the sensing signal of the piezoresistive matrix.

In the embodiment of the disclosure, a vehicle-mounted unit of a vehicle may be used to process and analyze the sensing signal of the piezoresistor matrix, and determine the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix. The arrangement can avoid the need of additionally arranging a processor for analyzing and processing the sensing signals, thereby reducing the cost, reducing the number of the arranged components in the vehicle and reducing the wiring.

Alternatively, the detection recording unit 2041 may include a receiver, a storage unit, and a transmitter. The receiver receives the sensing signal from the piezoresistor matrix 201, sends the sensing signal to the storage unit and performs storage recording, and the receiver can also send the sensing signal to the vehicle unit through the transmitter, so that the vehicle unit determines the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix.

In some embodiments, the processing module 204 is further configured to generate the tire condition adjustment signal based on the ground contact pressure of each matrix point in the ground contact range corresponding to the piezoresistive matrix after determining the ground contact pressure of each matrix point in the ground contact range corresponding to the piezoresistive matrix based on the sensed signal of the piezoresistive matrix. The tire condition adjustment signal may be, for example, a wheel angle adjustment signal, a tire pressure adjustment signal, or the like.

Specifically, the ground contact pressure within the ground contact area directly affects the performance of the tire, such as the performance characteristics of the tire, such as wear, traction, braking, handling, and rolling resistance. Therefore, after the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix is determined, the tire state adjusting signal can be generated according to the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix, so that the grounding state of the tire is adjusted, and the application performances of abrasion, operation stability and the like of the tire are improved. In addition, each piezoresistor in the piezoresistor matrixes in the grounding area is in a real-time high-frequency sampling state, so that the piezoresistor matrixes can detect the grounding area and the grounding pressure of the tire in the driving process more accurately in real time, the vehicle unit can accurately acquire the grounding state of the tire under any complex road condition or driving condition, the grounding state of the tire is further adjusted, and the use performance of the tire is improved.

For example, after determining the ground contact pressure of each matrix point in the ground contact range corresponding to the piezoresistor matrix, a corresponding wheel angle adjusting signal can be generated through the analysis of the tire ground contact pressure, the toe angle δ or the roll angle γ of the wheel is adjusted through an adjusting mechanism of the vehicle, and the ground contact state of the tire is adjusted through the adjustment of the toe angle δ or the roll angle γ, so that the application performances of abrasion, operation stability and the like of the tire are improved. For the pneumatic tire, the change of the tire pressure has great influence on both the tire grounding area and the grounding pressure, the tire pressure is large, the grounding area is small, the ground gripping performance is reduced, the tire pressure is small, the grounding area is increased, and the rolling resistance is correspondingly increased, so that after the grounding pressure of each matrix point in the grounding range corresponding to the piezoresistor matrix is determined, a corresponding tire state adjusting signal (such as a tire pressure adjusting signal) can be generated through analyzing the tire grounding pressure, the tire pressure of the tire is adjusted through an adjusting mechanism, the stability of the tire pressure is maintained, and the performance of the tire is ensured.

The embodiment of the disclosure further provides a vehicle, which includes the tire ground contact pressure detection system described in any of the above embodiments, and therefore has the beneficial effects described in the above embodiments, and details are not repeated here.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tire ground contact pressure detection method is characterized by comprising the following steps:

acquiring a sensing signal of a piezoresistor matrix in a tire;

wherein the tire is provided with a plurality of said piezoresistive matrices; a plurality of the piezoresistor matrices are arranged along the circumferential direction of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix.

2. The method of claim 1, wherein before the obtaining the sensing signal of the piezoresistor matrix in the tire, the method comprises:

identifying a vehicle travel direction based on the vehicle travel state;

3. The tire ground contact pressure detecting method according to claim 2, wherein the vehicle running direction is a forward direction; the step of sequentially supplying power to each row of the piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction comprises the following steps:

4. The tire ground contact pressure detecting method according to claim 2, wherein the vehicle running direction is a reverse direction; the step of sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction comprises the following steps:

5. The tire ground contact pressure detecting method according to claim 2, further comprising:

obtaining the rotating speed of the tire;

6. The method of detecting the ground contact pressure of a tire according to claim 1, further comprising, after determining the ground contact pressure of each matrix point in the ground contact range corresponding to the piezoresistor matrix from the sensing signal of the piezoresistor matrix:

7. A tire ground contact pressure detection system, comprising:

a plurality of piezoresistive matrices and a processing module;

8. The tire ground contact pressure detection system of claim 7, wherein the piezoresistors in the same row of the piezoresistor matrix are connected in series; the piezoresistors in the same column in the piezoresistor matrix are connected in series.

9. The tire grounding pressure detecting system of claim 8, wherein a diode is disposed between adjacent piezoresistors in the same row; diodes are arranged between adjacent piezoresistors in the same column; the conducting directions of the diodes in the same row are the same; the conducting directions of the diodes in the same column are the same.

10. The tire ground contact pressure detection system of claim 7, further comprising a power module electrically connected to each of the piezoresistors in the piezoresistor matrix.

11. The tire ground contact pressure detection system of claim 10, wherein the power module includes a power source, a rotational speed sensor, and a processing unit; the rotating speed sensor is used for acquiring the rotating speed of the tire; the processing unit is used for determining power supply frequency of the piezoresistor matrix according to the tire rotating speed and the matrix row number of the piezoresistor matrix, and sequentially supplying power to each row of piezoresistors of the piezoresistor matrix according to the power supply sequence corresponding to the vehicle running direction based on the power supply frequency.

12. The tire ground contact pressure detection system of claim 7, wherein the processing module comprises a detection recording unit and a vehicle machine unit;

13. A vehicle characterized by comprising the tire ground contact pressure detecting system according to any one of claims 7 to 12.