A tire ground contact pressure detection method, system and vehicle

Abstract

The present disclosure relates to a tire ground pressure detection method, system and vehicle, wherein the method comprises: obtaining a sensing signal of a piezoresistor matrix in a tire; determining the ground pressure of each matrix point in a ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix; wherein the tire is provided with a plurality of piezoresistor matrices; the plurality of piezoresistor matrices are arranged along the circumference of the tire; each piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix. The present disclosure realizes real-time and accurate detection of the stress condition of each point in the ground range of the tire during driving.

Description

Technical Field

[0001] The present disclosure relates to the technical field of tire performance testing, and in particular to a tire ground contact pressure detection method, system and vehicle. Background Art

[0002] As the only part of the vehicle that contacts the ground, the force applied to the tire during driving determines the performance of the vehicle to a certain extent. All the forces acting on the road surface during driving act on the contact area between the tire and the road surface, so it is particularly important to analyze the distribution of ground pressure within the tire contact area.

[0003] However, the existing technology generally tests the tire ground pressure indirectly, such as by using a non-contact measurement bench to achieve non-contact measurement of the tire ground pressure. Although the existing technology has achieved the measurement of the tire ground pressure, it requires an additional measurement device and can only measure the ground pressure of the tire when it is static, which greatly limits its scope of application. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a tire ground contact pressure detection method, system and vehicle.

[0005] The present disclosure provides a tire ground contact pressure detection method, comprising:

[0006] Acquire a sensing signal of a piezoresistor matrix in a tire;

[0007] Determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix according to the sensing signal of the varistor matrix;

[0008] Wherein, the tire is provided with a plurality of the varistor matrices; the plurality of the varistor matrices are arranged along the circumference of the tire; and each of the varistor matrices includes a plurality of varistors arranged in a matrix.

[0009] Optionally, before acquiring the sensing signal of at least one piezoresistor matrix in the tire, the method further comprises:

[0010] Identify the vehicle's driving direction based on the vehicle's driving state;

[0011] The step of obtaining a sensing signal of a piezoresistor matrix in a tire comprises:

[0012] Powering each row of the varistor matrix with power in sequence according to the power supply sequence corresponding to the driving direction of the vehicle;

[0013] After power is supplied to each row of varistors, a sensing signal of each column of the varistors in the row is obtained.

[0014] Optionally, the vehicle travels in a forward direction; and the step of sequentially supplying power to each row of the varistor matrix according to a power supply sequence corresponding to the vehicle travel direction includes:

[0015] Power is supplied to each row of the varistor matrix in sequence according to the power supply sequence of the forward row number corresponding to the forward direction.

[0016] Optionally, the vehicle is traveling in a reverse direction; and the step of sequentially supplying power to each row of the varistor matrix according to a power supply sequence corresponding to the vehicle's traveling direction includes:

[0017] Power is supplied to each row of the varistor matrix in sequence according to the power supply sequence of the reverse row number corresponding to the reversing direction.

[0018] Optionally, also include:

[0019] Get tire speed;

[0020] The power supply frequency for the varistor matrix is ​​determined according to the tire rotation speed and the number of matrix rows of the varistor matrix.

[0021] Optionally, after determining the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix, the method further includes:

[0022] A tire state adjustment signal is generated according to the ground contact pressure of each matrix point within the ground contact range corresponding to the varistor matrix.

[0023] The embodiment of the present disclosure also provides a tire ground contact pressure detection system, comprising:

[0024] Multiple varistor matrices and processing modules;

[0025] A plurality of the piezoresistor matrices are located in the tire and arranged along the circumference of the tire; each of the piezoresistor matrices includes a plurality of piezoresistors arranged in a matrix; the piezoresistor matrix is ​​used to obtain sensing signals of each matrix point within a corresponding grounding range;

[0026] The processing module is used to determine the grounding pressure of each matrix point within the grounding range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix.

[0027] Optionally, the varistors in the same row of the varistor matrix are connected in series; and the varistors in the same column of the varistor matrix are connected in series.

[0028] Optionally, a diode is arranged between adjacent varistors in the same row; a diode is arranged between adjacent varistors in the same column; the conduction directions of the diodes in the same row are the same; and the conduction directions of the diodes in the same column are the same.

[0029] Optionally, a power supply module is also included, and the power supply module is electrically connected to each of the varistors in the varistor matrix.

[0030] Optionally, the power supply module includes a power supply, a speed sensor and a processing unit; the speed sensor is used to obtain the tire speed; the processing unit is used to determine the power supply frequency of the varistor matrix according to the tire speed and the number of matrix rows of the varistor matrix, and based on the power supply frequency, sequentially supply power to each row of varistors in the varistor matrix in a power supply order corresponding to the vehicle's driving direction.

[0031] Optionally, the processing module includes a detection and recording unit and a vehicle unit;

[0032] The detection and recording unit is used to obtain and record the sensing signal and send the sensing signal to the vehicle unit; the vehicle unit is used to determine the grounding pressure of each matrix point within the corresponding grounding range of the varistor matrix according to the sensing signal of the varistor matrix.

[0033] The present disclosure also provides a vehicle, comprising the above-mentioned tire contact pressure detection system.

[0034] The technical solution provided by the present disclosure has the following advantages over the prior art: the present disclosure provides a tire ground pressure detection method, which obtains the sensing signal of the piezoresistor matrix in the tire; determines the ground pressure of each matrix point in the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix; wherein the tire is provided with a plurality of the piezoresistor matrices; the plurality of the piezoresistor matrices are arranged along the circumference of the tire; each of the piezoresistor matrix comprises a plurality of piezoresistors arranged in a matrix. . By adopting the above technical solution, the sensing signal can be obtained in real time through the piezoresistor matrix in the tire, so the ground pressure of each matrix point in the ground range corresponding to the piezoresistor matrix can be determined in real time and dynamically according to the acquired sensing signal, without the need for detection by an additional measuring device. And the plurality of piezoresistors in the embodiment of the present disclosure are arranged in a matrix to form a piezoresistor matrix, which can more accurately obtain the ground pressure of each position in the ground range of the tire, thereby realizing the real-time and accurate detection of the force condition of each point in the ground range of the tire in each state. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 present disclosure.

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 A schematic flow chart of a tire ground contact pressure detection method provided in an embodiment of the present disclosure;

[0038] Figure 2 A schematic diagram of the structure of a varistor matrix provided in an embodiment of the present disclosure;

[0039] Figure 3 A schematic diagram of the side structure of a tire provided in an embodiment of the present disclosure;

[0040] Figure 4 A schematic diagram of a partial cross-sectional structure of a tire provided in an embodiment of the present disclosure;

[0041] Figure 5 A schematic structural diagram of a tire ground contact pressure detection system provided in an embodiment of the present disclosure;

[0042] Figure 6 A schematic structural diagram of another tire ground contact pressure detection system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0045] Tires are the only parts of the vehicle that come into contact with the ground. The stress on the tires during the driving process determines the performance of the vehicle to a certain extent. During the driving process of the vehicle, various forces acting on the road surface act on the contact area between the tire and the road surface. Therefore, it is particularly important to dynamically analyze the distribution of ground pressure within the tire contact area in real time. In response to the above technical problems, the present disclosure provides a tire ground pressure detection method, which can accurately detect the stress conditions of each point within the tire contact range under dynamic conditions in real time. The method is introduced in conjunction with specific embodiments below.

[0046] Figure 1 A schematic diagram of a tire ground contact pressure detection method provided by an embodiment of the present disclosure is shown in FIG. Figure 1 and Figure 2 As shown, the method includes:

[0047] Step 101: Acquire a sensing signal of a piezoresistor matrix in a tire.

[0048] Specifically, at least one piezoresistor matrix 201 may be provided in the tire. The piezoresistor matrix 201 includes a plurality of piezoresistors 202 arranged in a matrix. Figure 2 The exemplary arrangement of the piezoresistors matrix 201 includes 4 rows and 5 columns, with a total of 20 piezoresistors 202. The matrix arrangement plane may be parallel to the tread of the tire. A piezoresistors 202 is arranged at each matrix point. When the tire contacts the ground and generates ground pressure, each piezoresistors 202 of the piezoresistors matrix 201 may sense a sensing signal generated by the contact between the tire and the ground.

[0049] Optional, such as Figure 3 as well as Figure 4 As shown, for a non-pneumatic tire, several piezoresistor matrices 201 can be evenly arranged along the circumference of the tire under the tread 203. For a pneumatic tire, the piezoresistor matrix 201 can be arranged under the tread, and can also be arranged on the belt layer, carcass layer, or inner surface of the tire according to actual conditions.

[0050] Step 102 : determining the grounding pressure of each matrix point within the grounding range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix 201 .

[0051] Based on this, the present disclosure can realize real-time dynamic detection of tire ground pressure by setting a piezoresistor matrix 201 in the tire, and no additional measuring equipment is required. Since each piezoresistor 202 of the piezoresistor matrix 201 can detect the sensing signal when the tire contacts the ground in real time, the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix 201 can be determined based on the sensing signal. Therefore, the present disclosure can also realize accurate detection of the force condition of each matrix point within the ground range of the tire by setting a piezoresistor matrix 201 composed of a plurality of piezoresistors 202 matrix arrangements.

[0052] Specifically, when the tire contacts the ground and generates ground pressure, the varistor 202 in the present disclosure is subjected to different ground pressures and has different resistance values. After being powered, the sensing signals it generates are also different, so the ground pressure of the tire can be calculated accordingly.

[0053] In some embodiments, before acquiring the sensing signal of the piezoresistor matrix 201 in the tire, the following steps are included:

[0054] Identify the vehicle's driving direction based on the vehicle's driving state;

[0055] Correspondingly, obtaining the sensing signal of the varistor matrix in the tire includes: powering each row of varistors in the varistor matrix in sequence according to the power supply sequence corresponding to the vehicle's driving direction; after powering each row of varistors, obtaining the sensing signal of each column of the varistors in the row.

[0056] Specifically, the vehicle can be driven in two directions: forward and reverse. When the vehicle is in different driving directions, the rotation direction of the tire is also different, and the order in which the piezoresistors 202 on the tire contact the ground is also different. Therefore, before obtaining the sensing signal of the piezoresistor matrix 201 in the tire, the vehicle driving direction is first determined, and each row of piezoresistors 202 is powered in sequence according to the vehicle driving direction. After each row of piezoresistors 202 is powered, the sensing signal of each column of the piezoresistors in the row is obtained.

[0057] The embodiment of the present disclosure can avoid the problem of ground pressure detection error caused by the difference between the contact sequence between the varistors 202 and the ground and the power supply sequence by sequentially supplying power to the varistors 202 in each row of the varistor matrix 201 based on the vehicle's driving direction.

[0058] In some embodiments, if the vehicle is traveling in a forward direction, then, correspondingly, powering each row of the varistor matrix in sequence according to the power supply sequence corresponding to the vehicle's traveling direction includes:

[0059] According to the power supply sequence of the forward row number corresponding to the forward direction, power is supplied to each row of the varistor matrix in sequence.

[0060] Exemplarily, before obtaining the sensing signal of the varistor matrix 201 in the tire, the driving direction of the vehicle is first determined. If the driving direction of the vehicle is the forward direction, the tire rotation direction is the counterclockwise direction. The rows of varistors 202 in the varistor matrix 201 are marked with row numbers in the counterclockwise direction, and the counterclockwise direction is defined as the positive direction of the row number of the varistor matrix 201. When the driving direction of the vehicle is the forward direction, the varistor 202 in each row of the varistor matrix 201 is powered in sequence according to the power supply sequence of the positive row number, that is, when the driving direction of the vehicle is the forward direction, the varistor 202 in each row of the varistor matrix 201 is powered in sequence in the counterclockwise direction.

[0061] In some embodiments, if the vehicle is traveling in a reverse direction, then, correspondingly, powering each row of the varistor matrix in sequence according to the power supply sequence corresponding to the vehicle's traveling direction includes:

[0062] According to the power supply sequence of the reverse row number corresponding to the reversing direction, power is supplied to each row of the varistor matrix in sequence.

[0063] Exemplarily, before obtaining the sensing signal of the varistor matrix 201 in the tire, the driving direction of the vehicle is first determined. If the driving direction of the vehicle is the reverse direction, the rotation direction of the tire is the clockwise direction. The rows of varistors 202 in the varistor matrix 201 are marked with row numbers in a counterclockwise direction, and the counterclockwise direction is defined as the positive direction of the row number of the varistor matrix 201, and the clockwise direction is defined as the reverse direction of the row number of the varistor matrix 201. When the driving direction of the vehicle is the reverse direction, the varistor 202 in each row of the varistor matrix 201 is powered in sequence according to the power supply sequence of the reverse row number, that is, when the driving direction of the vehicle is the reverse direction, the varistor 202 in each row of the varistor matrix 201 is powered in sequence according to the clockwise direction.

[0064] by Figure 2 For example, the varistor matrix 201 is composed of 4 rows and 5 columns of varistors 202 in a matrix structure. Among them, 4 rows are arranged along the rolling direction of the tire, and 5 columns are arranged along the axial direction of the tire. Among them, the X and Y axis directions refer to the SAE (Society of Automotive Engineers) coordinate system. The X axis is the direction of the intersection of the wheel plane and the road plane, also known as the contact line. The positive direction of X represents the direction in which the tire rolls. The Y axis is the projection direction of the wheel axle on the road plane. The positive direction of Y is to the right when looking at the positive direction of X from the rear side of the coordinate system. If the vehicle is traveling in the forward direction, power is supplied in a single row in the direction of row 1-row 2-row 3-row 4. If the vehicle is traveling in the reverse direction, power is supplied in a single row in the direction of row 4-row 3-row 2-row 1. When power is supplied to one row, the remaining rows are not powered.

[0065] In some embodiments, it also includes:

[0066] Get tire speed;

[0067] The frequency of power supply to the varistor matrix is ​​determined according to the tire rotation speed and the number of matrix rows of the varistor matrix.

[0068] Specifically, since it is necessary to supply power at least once within the grounding range corresponding to the varistor matrix, the faster the tire speed during the vehicle driving process, the greater the power supply frequency of the varistor matrix; the more matrix rows of the varistor matrix 201, the greater the power supply frequency of the varistor matrix. For example, the power supply frequency of the varistor matrix can be set to be positively correlated with the product of the tire speed and the number of matrix rows of the varistor matrix 201. The rotation time of the tire per unit angle t = 1 / (2πλ), so in order to make the varistor matrix corresponding to the grounding range powered at least once, the power supply frequency of the varistor matrix can be set to be f≥2πλm. Among them, t is the rotation time of the tire per unit angle, λ is the tire speed, m is the number of matrix rows of the varistor matrix 201, and f is the power supply frequency of the varistor matrix.

[0069] Still Figure 2For example, when the piezoresistors 202 in the first row are powered, the sensing signals I11, I21, I31, I41, and I51 of each column of the piezoresistors 202 in the row can be obtained. Among them, I11 is the sensing signal of the piezoresistors in the first column obtained by powering the piezoresistors in the first row; I21 is the sensing signal of the piezoresistors in the second column obtained by powering the piezoresistors in the first row; I31 is the sensing signal of the piezoresistors in the third column obtained by powering the piezoresistors in the first row; I41 is the sensing signal of the piezoresistors in the fourth column obtained by powering the piezoresistors in the first row; I51 is the sensing signal of the piezoresistors in the fifth column obtained by powering the piezoresistors in the first row. When the piezoresistors 202 in the second row are powered, the sensing signals I12, I22, I32, I42, and I52 of each column of the piezoresistors in the row can be obtained. Among them, I12 is the sensing signal of the first column of the varistor obtained by powering the varistor in the second row; I22 is the sensing signal of the second column of the varistor obtained by powering the varistor in the second row; I32 is the sensing signal of the third column of the varistor obtained by powering the varistor in the second row; I42 is the sensing signal of the fourth column of the varistor obtained by powering the varistor in the second row; I52 is the sensing signal of the fifth column of the varistor obtained by powering the varistor in the second row. When power is supplied to the varistor 202 in the third row, the sensing signals I13, I23, I33, I43, and I53 of each column of the varistor 202 in this row can be obtained. Among them, I13 is the sensing signal of the first column of the varistor obtained by powering the varistor in the third row; I23 is the sensing signal of the second column of the varistor obtained by powering the varistor in the third row; I33 is the sensing signal of the third column of the varistor obtained by powering the varistor in the third row; I43 is the sensing signal of the fourth column of the varistor obtained by powering the varistor in the third row; I53 is the sensing signal of the fifth column of the varistor obtained by powering the varistor in the third row. When power is supplied to the varistor 202 in the fourth row, the sensing signals I14, I24, I34, I44, and I54 of each column of the varistor 202 in this row can be obtained. Among them, I14 is the sensing signal of the 1st column varistor obtained by powering the 4th row varistor; I24 is the sensing signal of the 2nd column varistor obtained by powering the 4th row varistor; I34 is the sensing signal of the 3rd column varistor obtained by powering the 4th row varistor; I44 is the sensing signal of the 4th column varistor obtained by powering the 4th row varistor; I54 is the sensing signal of the 5th column varistor obtained by powering the 4th row varistor. The disclosed embodiment can determine the ground pressure of each matrix point according to the power supply voltage, I11, I21, I31, I41, I51, I12, I22, I32, I42, I52, I13, I23, I33, I43, I53, I14, I24, I34, I44, I54.

[0070] Based on this, the resistance of the varistor changes when it is subjected to pressure, and there is a specific relationship between the resistance value R and the pressure F. The resistance value R can be obtained by the pressure F, and the pressure F can also be inversely calculated by the resistance value R. When the set supply voltage is provided, the sensing signal is a current signal. The current signal can be used to know the current resistance value, and the ground pressure can be calculated based on the current resistance value.

[0071] If the varistors in the same row of the varistor matrix are connected in series; the varistors in the same column of the varistor matrix are connected in series. According to the above method, when the 1st row is powered, R11 (the resistance of the 1st row and 1st column varistor) can be known from the current signal I11, and then the ground pressure F11 at the matrix point where the varistor in the 1st row and 1st column is located can be calculated through the relationship between resistance and pressure. F12 (the ground pressure at the matrix point where the varistor in the 1st row and 2nd column is located) can be obtained through the current signals I11 and I12, and so on, until F15 (the ground pressure at the matrix point where the varistor in the 1st row and 5th column is located) is obtained. When the second row is powered, the current is output by the varistor in the second row through the varistor in the first row, and the current signals I12, I22, I32, I42, and I52 of each column are obtained. According to I11, I21, I31, I41, I51, I12, I22, I32, I42, and I52, Fi2 can be determined. Among them, Fi2 is the grounding pressure at the matrix point where the varistor in the second row and the i-th column is located. i is a positive integer from 1 to 5. By analogy, the grounding pressure of each matrix point in the accurate grounding range can be obtained.

[0072] In some embodiments, after determining the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix 201, the method further includes:

[0073] A tire state adjustment signal is generated according to the ground contact pressure of each matrix point within the ground contact range corresponding to the varistor matrix.

[0074] Specifically, the ground pressure within the contact area will directly affect the performance of the tire, such as tire wear, traction, braking, handling stability, rolling resistance and other performance. Therefore, after determining the ground pressure of each matrix point within the ground range corresponding to the varistor matrix, the embodiment of the present disclosure can generate a tire state adjustment signal according to the ground pressure of each matrix point within the ground range corresponding to the varistor matrix, thereby adjusting the ground state of the tire and improving the wear, handling stability and other applicable performance of the tire. In addition, each varistor in the multiple varistor matrices within the contact area is in a real-time high-frequency sampling state, so that the varistor matrix can detect the contact area and ground pressure of the tire during driving in a more real-time and accurate manner, so that the tire contact state can be accurately obtained under any complex road conditions or driving conditions, and then the tire contact state can be adjusted to improve the performance of the tire.

[0075] For example, after determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix, a corresponding wheel angle adjustment signal can be generated by analyzing the tire grounding pressure, and the wheel toe angle δ or the roll angle γ can be adjusted by the adjustment mechanism. The tire grounding state can be adjusted by adjusting the toe angle δ or the roll angle γ, so as to improve the tire wear, handling stability and other applicable performance. For pneumatic tires, the change of tire pressure has a great influence on the tire grounding area and grounding pressure. The larger the tire pressure, the smaller the grounding area, and the lower the grip performance. The smaller the tire pressure, the larger the grounding area, and the rolling resistance will also increase accordingly. Therefore, after determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix, a corresponding tire state adjustment signal (such as a tire pressure adjustment signal) can be generated by analyzing the tire grounding pressure, and the tire pressure can be adjusted by the adjustment mechanism to maintain the stability of the tire pressure and ensure the performance of the tire.

[0076] Based on the same inventive concept, the present disclosure also provides an exemplary tire ground contact pressure detection system, such as Figure 5 As shown, Figure 5 A schematic diagram of a tire ground contact pressure detection system provided in an embodiment of the present disclosure, the system comprising:

[0077] A plurality of piezoresistor matrices 201 and a processing module 204;

[0078] A plurality of piezoresistance matrices 201 are located in the tire and arranged along the circumference of the tire; the piezoresistance matrix 201 includes a plurality of piezoresistors arranged in a matrix; the piezoresistance matrix 201 is used to obtain sensing signals of each matrix point within a corresponding grounding range;

[0079] The processing module 204 is used to determine the grounding pressure of each matrix point within the corresponding grounding range of the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix.

[0080] Multiple piezoresistors are arranged along the circumference of the tire. The arrangement of the piezoresistors in each piezoresistors matrix 201 can be seen, for example, in Figure 2 As shown, each piezoresistor matrix 201 is composed of a plurality of piezoresistors 202 arranged in a matrix. The processing module 204 is used to determine the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix 201 according to the sensing signal of the piezoresistor matrix. Such a setting can realize accurate detection of the stress condition of each point within the ground range of the tire under various conditions.

[0081] In some embodiments, the varistors in the varistor matrix may be independent of each other, that is, after power is supplied to each varistor, each varistor outputs a sensing signal independently.

[0082] In some embodiments, the varistors in the same row of the varistor matrix are connected in series; the varistors in the same column of the varistor matrix are connected in series. The arrangement and connection method of the varistors provided in the embodiments of the present disclosure can make the sensing signal of the varistor in the next row be affected by the sensing signal of the varistor in the previous row, and can calculate the grounding pressure of each matrix point in the corresponding grounding range of the varistor matrix based on the sensing signal output by each row of varistors.

[0083] In some embodiments, diodes are arranged between adjacent varistors in the same row; diodes are arranged between adjacent varistors in the same column; the conduction directions of the diodes in the same row are the same; and the conduction directions of the diodes in the same column are the same.

[0084] Specifically, Figure 2 As shown, a diode is arranged between adjacent varistors in the same row, and the conduction direction of each diode in the same row is the same, ensuring that the current can only flow in one direction between each row; a diode is arranged between adjacent varistors in the same column, and the conduction direction of each diode in the same column is the same, ensuring that the current can only flow in one direction between each column, further ensuring the accuracy of ground pressure detection. Figure 2 As shown, diodes are arranged between adjacent varistors in each row, which ensures that current can only flow in one direction between each row, for example, along the positive direction of the Y axis. Diodes are also arranged between adjacent varistors in each column, which ensures that current can only flow in one direction between each column. When power is supplied, the current between each column flows along the positive direction of the X axis.

[0085] In some embodiments, see Figure 6 The tire ground contact pressure detection system further includes a power supply module 205, which is electrically connected to each varistor in the varistor matrix 201. The power supply module is used to supply power to each varistor in the varistor matrix.

[0086] Optionally, the processing module may also identify the vehicle's driving direction based on the vehicle's driving state.

[0087] The power supply module can sequentially supply power to each row of varistors in the varistor matrix according to the power supply sequence corresponding to the vehicle's driving direction; after supplying power to each row of varistors, the processing module obtains the sensing signal of each column of the varistor in the row, so the processing module can determine the ground pressure of each matrix point in the corresponding ground range of the varistor matrix according to the sensing signal of the varistor matrix. Specifically, when the vehicle is driving, it can be divided into two driving directions: forward and reverse. When the vehicle is in different driving directions, the rotation direction of the tire is also different, and the order in which the varistor 202 on the tire contacts the ground is also different. Therefore, in order to avoid the ground pressure detection error caused by the difference between the contact sequence of the varistor 202 and the ground and the power supply sequence, the present disclosure can also give priority to judging the vehicle's driving direction before obtaining the sensing signal of at least one varistor matrix 201 in the tire, and sequentially supply power to each row of varistors 202 through the power supply module 205 according to the vehicle's driving direction.

[0088] Specifically, the power supply module is further used to sequentially supply power to the varistor 202 in each row of the varistor matrix 201 according to the power supply sequence of the forward row number corresponding to the forward direction.

[0089] Specifically, the power supply module is further used to sequentially supply power to the varistor 202 in each row of the varistor matrix 201 according to the power supply sequence of the reverse row number corresponding to the reversing direction.

[0090] In some embodiments, see Figure 6 The power supply module 205 may also include a power supply 2051, a speed sensor 2052 and a processing unit 2053. The power supply 2051 is used to supply power to the speed sensor 2052, the processing unit 2053 and the varistor matrix 201. The speed sensor 2052 is used to obtain the tire speed. The processing unit 2053 is used to determine the power supply frequency of the varistor matrix according to the tire speed and the number of matrix rows of the varistor matrix, and based on the power supply frequency, in accordance with the power supply sequence corresponding to the vehicle driving direction, sequentially supply power to each row of varistors in the varistor matrix.

[0091] Specifically, since it is necessary to supply power at least once within the grounding range corresponding to the varistor matrix, the faster the tire speed during the vehicle driving process, the greater the power supply frequency of the varistor matrix; the more matrix rows of the varistor matrix 201, the greater the power supply frequency of the varistor matrix. For example, the power supply frequency of the varistor matrix can be set to be positively correlated with the product of the tire speed and the number of matrix rows of the varistor matrix 201. The rotation time of the tire per unit angle t = 1 / (2πλ), so in order to make the varistor matrix corresponding to the grounding range powered at least once, the power supply frequency of the varistor matrix can be set to be f≥2πλm. Among them, t is the rotation time of the tire per unit angle, λ is the tire speed, m is the number of matrix rows of the varistor matrix 201, and f is the power supply frequency of the varistor matrix.

[0092] It should be noted that the power supply module 205 can be set in the tire or outside the tire, and the embodiment of the present disclosure does not limit the setting position of the power supply module 205.

[0093] In some embodiments, see Figure 6 , the processing module 204 includes a detection and recording unit 2041 and a vehicle unit 2042;

[0094] The detection and recording unit 2041 is used to obtain and record the sensing signal and send the sensing signal to the vehicle unit; the vehicle unit 2042 is used to determine the grounding pressure of each matrix point within the corresponding grounding range of the varistor matrix according to the sensing signal of the varistor matrix.

[0095] In the disclosed embodiment, the vehicle's vehicle unit can be used to process and analyze the sensing signal of the varistor matrix to determine the ground pressure of each matrix point within the ground range corresponding to the varistor matrix. This configuration eliminates the need for an additional processor for analyzing and processing the sensing signal, thereby reducing costs, and can also reduce the number of components and wiring in the vehicle.

[0096] Optionally, the detection and recording unit 2041 may include a receiver, a storage unit and a transmitter. The receiver receives the sensing signal from the piezoresistor matrix 201 and sends it to the storage unit for storage and recording. The receiver may 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 within the corresponding grounding range of the piezoresistor matrix according to the sensing signal of the piezoresistor matrix.

[0097] In some embodiments, the processing module 204 is further configured to generate a tire state adjustment signal according to the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix after determining the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix. The tire state adjustment signal may be, for example, a wheel angle adjustment signal, a tire pressure adjustment signal, etc.

[0098] Specifically, the ground pressure within the contact area will directly affect the performance of the tire, such as tire wear, traction, braking, handling stability, rolling resistance and other performance. Therefore, after determining the ground pressure of each matrix point within the ground range corresponding to the varistor matrix, the embodiment of the present disclosure can generate a tire state adjustment signal according to the ground pressure of each matrix point within the ground range corresponding to the varistor matrix, thereby adjusting the ground state of the tire and improving the wear, handling stability and other applicable performance of the tire. In addition, each varistor in the multiple varistor matrices within the contact area is in a real-time high-frequency sampling state, so that the varistor matrix can detect the contact area and ground pressure of the tire during driving in a more real-time and accurate manner, so that the vehicle unit can accurately obtain the tire contact state under any complex road conditions or driving conditions, and then adjust the tire contact state to improve the performance of the tire.

[0099] For example, after determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix, a corresponding wheel angle adjustment signal can be generated by analyzing the tire grounding pressure, and the wheel toe angle δ or the roll angle γ can be adjusted through the vehicle's adjustment mechanism. The tire grounding state can be adjusted by adjusting the toe angle δ or the roll angle γ, thereby improving the tire's wear, handling stability and other applicable performance. For pneumatic tires, changes in tire pressure have a great impact on the tire grounding area and grounding pressure. When the tire pressure is large, the grounding area is small, and the grip performance is reduced. When the tire pressure is small, the grounding area is increased, and the rolling resistance will also increase accordingly. Therefore, after determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix, a corresponding tire state adjustment signal (such as a tire pressure adjustment signal) can be generated by analyzing the tire grounding pressure. The tire pressure is adjusted through the adjustment mechanism to maintain the stability of the tire pressure and ensure the performance of the tire.

[0100] The disclosed embodiments further provide a vehicle, which includes the tire contact pressure detection system described in any of the above embodiments, and thus has the beneficial effects described in the above embodiments, which will not be described in detail here.

[0101] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0102] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tire ground contact pressure detection method, characterized in that: include: Acquire a sensing signal of a piezoresistor matrix in a tire; Determining the grounding pressure of each matrix point within the grounding range corresponding to the varistor matrix according to the sensing signal of the varistor matrix; Wherein, the tire is provided with a plurality of the piezoresistance matrices; the plurality of the piezoresistance matrices are arranged along the circumference of the tire; each of the piezoresistance matrices includes a plurality of piezoresistors arranged in a matrix; Before acquiring the sensing signal of the piezoresistor matrix in the tire, the method includes: Identify the vehicle's driving direction based on the vehicle's driving state; The step of obtaining a sensing signal of a piezoresistor matrix in a tire comprises: Powering each row of the varistor matrix with power in sequence according to the power supply sequence corresponding to the driving direction of the vehicle; After power is supplied to each row of varistors, a sensing signal of each column of the varistors in the row is obtained.

2. The tire ground contact pressure detection method according to claim 1, characterized in that: The vehicle driving direction is a forward direction; and the powering each row of the varistor matrix is ​​powered in sequence according to the power supply sequence corresponding to the vehicle driving direction, including: Power is supplied to each row of the varistor matrix in sequence according to the power supply sequence of the forward row number corresponding to the forward direction.

3. The tire ground contact pressure detection method according to claim 1, characterized in that: The vehicle driving direction is a reverse direction; and the powering each row of the varistor matrix is ​​powered in sequence according to the power supply sequence corresponding to the vehicle driving direction, including: Power is supplied to each row of the varistor matrix in sequence according to the power supply sequence of the reverse row number corresponding to the reversing direction.

4. The tire ground contact pressure detection method according to claim 1, characterized in that: Also includes: Get tire speed; The power supply frequency for the varistor matrix is ​​determined according to the tire rotation speed and the number of matrix rows of the varistor matrix.

5. The tire ground contact pressure detection method according to claim 1, characterized in that: After determining the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix, the method further includes: A tire state adjustment signal is generated according to the ground contact pressure of each matrix point within the ground contact range corresponding to the varistor matrix.

6. A tire ground contact pressure detection system, characterized in that: include: Multiple varistor matrices and processing modules; A plurality of piezoresistor matrices are located in the tire and arranged along the circumference of the tire; Each of the varistor matrices includes a plurality of varistors arranged in a matrix; The varistor matrix is ​​used to obtain sensing signals of each matrix point within the corresponding ground range; The processing module is used to determine the ground pressure of each matrix point within the ground range corresponding to the piezoresistor matrix according to the sensing signal of the piezoresistor matrix; It also includes a power supply module, the power supply module is electrically connected to each of the varistors in the varistor matrix; The power supply module includes a power supply, a speed sensor and a processing unit; the speed sensor is used to obtain the tire speed; the processing unit is used to determine the power supply frequency of the varistor matrix according to the tire speed and the number of matrix rows of the varistor matrix, and based on the power supply frequency, sequentially supply power to each row of varistors in the varistor matrix in a power supply order corresponding to the vehicle's driving direction.

7. The tire contact pressure detection system according to claim 6, characterized in that: The varistors in the same row of the varistor matrix are connected in series; and the varistors in the same column of the varistor matrix are connected in series.

8. The tire contact pressure detection system according to claim 7, characterized in that: A diode is arranged between adjacent varistors in the same row; a diode is arranged between adjacent varistors in the same column; the conduction directions of the diodes in the same row are the same; and the conduction directions of the diodes in the same column are the same.

9. The tire contact pressure detection system according to claim 6, characterized in that: The processing module includes a detection and recording unit and a vehicle unit; The detection and recording unit is used to obtain and record the sensing signal and send the sensing signal to the vehicle unit; the vehicle unit is used to determine the grounding pressure of each matrix point within the corresponding grounding range of the varistor matrix according to the sensing signal of the varistor matrix.

10. A vehicle, characterized in that: A tire ground contact pressure detection system comprising any one of claims 6-9.

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