Intelligent monitoring device, method and equipment for tire sidewall scratching

Abstract

The invention discloses an intelligent monitoring device, method and equipment for tire sidewall scratching, and belongs to the field of tire sidewall scratching monitoring. The problems that due to the fact that the number of monitoring devices and methods for the tire side wall is small, when the tire side wall is abraded or even damaged, early warning cannot be conducted in time, potential safety hazards cannot be checked, and driving safety is reduced are solved. According to the tire sidewall scratching intelligent monitoring device, method and equipment, a resistance strain type sensor module detects tire sidewall deformation quantity and converts the tire sidewall deformation quantity into a voltage signal, a signal processing module compares the voltage signal with a set threshold value, and when a control module controls a monitoring module to output a high-level signal, the monitoring module outputs the high-level signal; when the tire climbs the curb and is possibly scratched, the control module activates the tire climbing curb scratching alarm system and sends out alarm information such as alarm ringtone to prompt a driver to take necessary measures to enable the vehicle to be away from the curb, and then the monitoring module outputs a low-level signal.

Description

Technical Field

[0001] The present invention relates to a tire scratch monitoring device and a monitoring method, and in particular to an intelligent tire sidewall scratch monitoring device, method and equipment. Background Art

[0002] In recent years, smart tires, a crucial component of modern vehicles, have seen their development driven by advances in sensor technology. Currently, the core component of smart tires is the sensor, which monitors tire pressure, temperature, and wear in real time. This data is transmitted to the vehicle's electronic control unit (ECU) via wired or wireless technology. Existing smart tire monitoring devices primarily focus on monitoring various tread parameters. This is because the tread directly contacts the road surface, and its wear, pressure, and temperature are crucial to the vehicle's driving performance and safety. Tread monitoring primarily includes parameters such as pressure, temperature, and wear, which affect the tire's grip, steering sensitivity, and overall service life. In contrast, monitoring of the tire sidewall is less common. This results in a lack of timely warning and troubleshooting of safety hazards when the sidewall becomes worn or even damaged, thereby compromising driving safety.

[0003] The sidewalls of tires are relatively thin and prone to scratches, which affects the driving safety of the vehicle. When a car climbs over a curb, it is particularly important to detect whether the tire sidewalls are scratched or damaged. Whether the sidewalls are damaged is determined by the integrity of the tire cord layer, which is related to whether the tire can be used normally, thereby affecting driving safety. The raw materials of the tire cord layer include cotton, rayon, polyamide, polyester, aromatic polyamide, steel wire, etc. The resistive strain sensor can measure its tiny distance changes and ensure the driving safety of the vehicle to a greater extent. Therefore, the present invention designs a monitoring device and a monitoring method for when a vehicle climbs over a curb and when a scratch occurs on the sidewall of an intelligent tire. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that due to the lack of existing monitoring devices and methods for tire sidewalls, when the sidewalls are worn or even damaged, it is impossible to timely warn and check for safety hazards, resulting in reduced driving safety, and to propose an intelligent monitoring device, method and equipment for tire sidewall scratches.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A tire sidewall scratch intelligent monitoring device comprises a monitoring module, a control module, an information processing module, an early warning module, a power supply module and a set of resistance strain sensor modules;

[0007] The resistance strain sensor module is used to convert the deformation of the tire sidewall into the resistance value change of the wire strain gauge, and then output the circuit change voltage caused by the resistance value change obtained by the wire strain gauge as a signal to the information processing module; and the resistance strain sensor module is arranged on the inner side of the tire sidewall cord layer; each resistance strain sensor module includes a flexible circuit board, a wire strain gauge and a bridge circuit, the wire strain gauge and the bridge circuit are attached to the flexible circuit board, and the wire strain gauge is used to convert the deformation of the tire sidewall into the voltage of the wire strain gauge. The bridge circuit is used to output the circuit change voltage caused by the resistance change obtained by the metal wire strain gauge as a signal to the information processing module; every four resistance strain sensor modules constitute a sensor unit, and each resistance strain sensor module includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit;

[0008] The information processing module is used to convert the changing voltage output by the bridge circuit into a rectangular wave output voltage of a certain frequency, and transmit the rectangular wave output voltage to the monitoring module for threshold comparison; the changing voltage output by the bridge circuit is represented as U0, and the rectangular wave output voltage is represented as

[0009] The monitoring module is used to compare the frequency of the target signal with the frequency threshold set in the monitoring module and output a corresponding electrical signal; the monitoring module includes a 74HC123 dual monostable trigger, pins 1 and 2 of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and a sinusoidal signal added to pin 15 of the 74HC123 dual monostable trigger through the VD terminal is used as the set frequency threshold;

[0010] The control module is used to perform logical operations on the output results of the information processing module and the monitoring data of the monitoring module, evaluate the obtained result information according to the established logic, and then decide whether to activate the early warning module to implement the early warning operation; the control module adopts a single-chip microcomputer;

[0011] The power supply module is used to provide operating voltage for the entire system;

[0012] The early warning module is used to receive instructions from the control module and issue an alarm. The early warning module includes a tire climbing curb scratch alarm system and an alarm terminal. After receiving the instructions from the control module, the tire climbing curb scratch alarm system will trigger the alarm mechanism and issue an alarm bell and other warning information through the alarm terminal.

[0013] Furthermore, the information processing module adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator;

[0014] The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13 , the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier;

[0015] The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module.

[0016] Furthermore, the metal wire strain gauge adopts a metal wire structure that is coiled in a quasi-sine wave shape; and the bridge circuit adopts a full-bridge differential bridge circuit.

[0017] A tire sidewall scratch intelligent monitoring method, the monitoring method comprising:

[0018] The resistance strain sensor module converts the deformation of the tire sidewall into the resistance value change of the wire strain gauge, and then outputs the circuit change voltage caused by the resistance value change of the wire strain gauge as a signal to the information processing module;

[0019] The changing voltage output by the bridge circuit is converted into a rectangular wave output voltage of a certain frequency through the information processing module, and the rectangular wave output voltage is transmitted to the monitoring module for threshold comparison; the changing voltage output by the bridge circuit is expressed as U0, and the rectangular wave output voltage is expressed as Rectangular wave output voltage The threshold signal set by the 74HC123 dual monostable trigger For comparison, when When the 74HC123 dual monostable trigger outputs a high level, 74HC123 dual monostable trigger outputs low level;

[0020] The monitoring module compares the frequency of the target signal with the frequency threshold set in the monitoring module and outputs a corresponding electrical signal; the monitoring module includes a 74HC123 dual monostable trigger, pins 1 and 2 of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and a sinusoidal signal is added to pin 15 of the 74HC123 dual monostable trigger through the VD end as the set frequency threshold; when the rectangular wave output voltage After inputting into the 74HC123 dual monostable trigger, if the rectangular wave output voltage When the frequency is higher than the frequency threshold set by 74HC123 dual monostable trigger, 74HC123 dual monostable trigger outputs high level; on the contrary, if the rectangular wave output voltage is When the frequency is lower than the set threshold, the output is low level;

[0021] The control module performs logical operations on the output results of the information processing module and the monitoring data of the monitoring module, evaluates the obtained result information according to the established logic, and then decides whether to activate the early warning module to implement the early warning operation; the control module adopts a single chip microcomputer;

[0022] The warning module receives the command from the control module and issues an alarm. The warning module includes a tire climbing curb scratch alarm system and an alarm terminal. After receiving the command from the control module, the tire climbing curb scratch alarm system will trigger an alarm mechanism and issue an alarm bell and other warning information through the alarm terminal;

[0023] Providing operating voltage to the entire system through the power supply module;

[0024] When the monitoring module outputs a high-level signal, it indicates that the tire has climbed onto the curb and may have scratched it. At this time, the control module activates the tire climbing and curb scratch alarm system, triggering the alarm mechanism and sending an alarm bell and other warning information through the alarm terminal. After receiving the warning information, the driver takes necessary measures to move the vehicle away from the curb, and then the monitoring module will output a low-level signal. After that, the control module stops the alarm when it detects the low-level signal. Conversely, if the control module detects that the monitoring module outputs a continuous low-level signal, the tire climbing and curb scratch alarm system remains silent and does not trigger the alarm.

[0025] Wherein, the resistance strain sensor module is arranged on the inner side of the tire sidewall cord layer; each of the resistance strain sensor modules includes a flexible circuit board, a metal wire strain gauge and a bridge circuit, the metal wire strain gauge and the bridge circuit are pasted on the flexible circuit board, the metal wire strain gauge is used to convert the deformation of the tire sidewall into a change in the resistance value of the metal wire strain gauge, and the bridge circuit is used to output the circuit change voltage caused by the change in the resistance value obtained by the metal wire strain gauge as a signal to the information processing module; every four resistance strain sensor modules are a sensor unit, and each resistance strain sensor module 6 includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit;

[0026] Furthermore, the resistance strain sensor module converts the deformation of the tire sidewall into a resistance change of the wire strain gauge, and then outputs the circuit change voltage caused by the resistance change of the wire strain gauge as a signal to the information processing module in the following process:

[0027] When external force acts on the tire sidewall, the change in resistance reflects the deformation of the strain gauge, as shown in formula (1):

[0028]

[0029] Where: R is the original resistance of the strain gauge; ΔR is the change in the resistance of the strain gauge; l is the original length of the strain gauge; Δl is the change in the length of the strain gauge; r is the original radius of the material used in the strain gauge; Δr is the change in the radius of the material used in the strain gauge; ρ is the original density of the material used in the strain gauge; Δρ is the change in the density of the material used in the strain gauge;

[0030] The sensitivity coefficient of the resistance strain sensor is:

[0031]

[0032] Where ε is the axial strain of the wire, The sensitivity coefficient K1 of metal materials is approximately between 1.7 and 3.6, and the sensitivity coefficient K2 of semiconductor materials is approximately 100.

[0033] Radial strain of the wire ε r The relationship between the axial strain ε is:

[0034] ε r =-με (3)

[0035] μ is the Poisson coefficient, and from formulas (1) and (3) we can get:

[0036]

[0037] Where (1+2μ)ε represents the geometric deformation effect when the resistance value changes relative to the resistor. Indicates the piezoresistive effect when the resistance value changes relative to the resistor;

[0038] Use metal strain gauges to sense the relative change in resistance caused by strain. If the ambient temperature changes, the resistance will also change relatively. Since the strain gauges of resistance strain sensors have temperature characteristics:

[0039]

[0040] Where, Indicates the relative change in the resistance of the strain gauge caused by the strain change. Indicates the relative change in the resistance of the strain gauge caused by temperature changes; a full-bridge differential bridge is used for temperature compensation to reduce errors; the output voltage of the Wheatstone bridge circuit to which the resistance strain gauge is connected is recorded as U0, and the input voltage of the bridge is U. The DC bridge balance condition yields:

[0041]

[0042] In a DC bridge: R1R4=R2R3 or Bridge arm ratio The voltage sensitivity of the single-arm bridge is given by:

[0043]

[0044] The combined results are:

[0045]

[0046] In formula (8), the denominator Smaller ones can be ignored;

[0047]

[0048] From formula (9), it can be seen that when n=1, the voltage sensitivity K μ A maximum value can be obtained

[0049] In the actual case of U0 in formula (8), the simplification process, the denominator The actual existence causes the relative change of the actual output voltage U0 and the resistance to be not in a linear relationship. There is a nonlinear error between the two, namely:

[0050] Actual output voltage:

[0051] Ideal output voltage:

[0052] Nonlinear error:

[0053] Temperature compensation of strain gauges;

[0054] In a full-bridge differential bridge, the bridge arms meet the balance conditions of the bridge under initial conditions; during operation, the resistance of all four bridge arms changes, then:

[0055]

[0056] Where,

[0057] like Then η=0;

[0058] Therefore, when the bridge arm ratio n=1, the expression of the output voltage is:

[0059]

[0060] Full-bridge differential bridge, where:

[0061]

[0062] Combining formulas (2), (15), and (16), we can obtain:

[0063]

[0064] From this, we can see that when the resistance strain gauge is deformed due to scratches on the tire sidewall and its resistance changes, the two bridges of the Wheatstone bridge will no longer be balanced, and the voltage output of the bridge will change accordingly based on the deformation.

[0065] Furthermore, the information processing module adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator;

[0066] The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13, the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier;

[0067] The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module;

[0068] When the output voltage of the bridge circuit changes, the signal is transmitted to the input of the first operational amplifier, that is, U3, to generate an inverting input, and the interference signal is removed at U1; the output of the first operational amplifier circuit is connected to the hysteresis comparator to generate an output square wave signal of a certain frequency.

[0069] Furthermore, the metal wire strain gauge adopts a metal wire structure that is coiled in a quasi-sine wave shape; and the bridge circuit adopts a full-bridge differential bridge circuit.

[0070] A device for intelligently monitoring tire sidewall scratches, comprising:

[0071] processor;

[0072] a memory storing executable instructions for the processor;

[0073] The processor is configured to perform the steps of a tire sidewall scratch intelligent monitoring method by executing the executable instructions.

[0074] A computer-readable storage medium is used to store a program, which, when executed, implements the steps of a tire sidewall scratch intelligent monitoring method.

[0075] The beneficial effects of the present invention are:

[0076] The present invention significantly reduces the risk of damage to the tire sidewalls when the vehicle climbs the curb, and ensures the safety of vehicle driving. It has the advantages of fast detection speed and high detection accuracy. Specifically, the present invention uses the resistance strain effect to detect the degree of scratching of the tire sidewall and whether it is damaged when the tire climbs the curb. The resistance strain sensor can respond to tiny stress changes, has a relatively simple structure, and can be made very small, which is convenient for integration into the tire, and does not require complex signal conditioning circuits. It can monitor the status of the tire cord layer in real time during driving; respond quickly and assist driving decisions in time; improve driving safety and efficiency, and reduce traffic accidents. When the tire sidewall is deformed, the resistance strain sensor and the monitoring and early warning system can realize real-time monitoring and early warning of the tire sidewall. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is a principle block diagram of the device involved in the present invention;

[0078] Figure 2 This is a schematic diagram of the installation of the resistance strain sensor module of the present invention on the inner side of the tire sidewall ply;

[0079] Figure 3 This is a schematic diagram of the arrangement of the resistance strain sensor module involved in the present invention;

[0080] Figure 4 This is a circuit schematic diagram of an information processing module according to the present invention;

[0081] Figure 5 The present invention relates to a method flow chart. DETAILED DESCRIPTION

[0082] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention. Specific implementation method one:

[0084] The present embodiment provides an intelligent tire sidewall scratch monitoring device, which comprises a monitoring module 1, a control module 2, an information processing module 3, an early warning module 4, a power supply module 5 and a set of resistance strain sensor modules 6;

[0085] The resistance strain sensor module 6 is used to convert the deformation of the tire sidewall into the resistance value change of the wire strain gauge, and then output the circuit change voltage caused by the resistance value change of the wire strain gauge as a signal to the information processing module 3; Figure 2 As shown, the tire cross-section structure is composed of a carcass layer 7, a steel belt layer 8, and a cap layer 9 from the inside to the outside. The side of the cap layer 9 is a shoulder 10, and the front part of the cap layer 9 that contacts the road surface is a crown 12. The resistance strain sensor module 6 is arranged on the inner side of the tire side carcass layer 7; each of the resistance strain sensor modules 6 includes a flexible printed circuit (FPC), a metal wire strain gauge and a bridge circuit. The metal wire strain gauge and the bridge circuit are attached to the flexible printed circuit (FPC). On a FPC (Frequency Printed Circuit), a wire strain gauge is used to convert the deformation of the tire sidewall into a change in the resistance value of the wire strain gauge, and a bridge circuit is used to output a circuit change voltage caused by the change in the resistance value obtained by the wire strain gauge to the information processing module 3 as a signal; each resistance strain sensor module 6 includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit;

[0086] Flexible printed circuits (FPCs) are lightweight, thin, and flexible in three dimensions. They are attached to the center of the inner side of the tire's sidewall ply, ensuring a stable sensor operating environment while reducing the risk of circuit damage caused by mechanical stress and protecting the integrity of the tire's ply structure. Resistive strain sensors accurately reflect the degree of tire sidewall deformation by monitoring changes in the resistance of the strain gauge.

[0087] The information processing module 3 is used to convert the changing voltage output by the Wheatstone bridge circuit into a rectangular wave output voltage of a certain frequency, and transmit the rectangular wave output voltage to the monitoring module 1 for threshold comparison; the changing voltage output by the bridge circuit is represented as U0, and the rectangular wave output voltage is represented as

[0088] The monitoring module 1 is used to compare the frequency of the target signal with the frequency threshold set in the monitoring module 1 and output a corresponding electrical signal; the monitoring module 1 includes a 74HC123 dual monostable trigger, pins 1 and 2 of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and a sinusoidal signal is added to pin 15 of the 74HC123 dual monostable trigger through the VD end as the set frequency threshold; when the rectangular wave output voltage After inputting into the 74HC123 dual monostable trigger, if the rectangular wave output voltage When the frequency is higher than the frequency threshold set by 74HC123 dual monostable trigger, 74HC123 dual monostable trigger outputs high level; on the contrary, if the rectangular wave output voltage is When the frequency is lower than the set threshold, the output is low level;

[0089] The control module 2 is used to perform logical operations on the output results of the information processing module 3 and the monitoring data of the monitoring module 1, evaluate the obtained result information according to the established logic, and then decide whether to activate the early warning module 4 to implement the early warning operation; the control module 2 adopts a single-chip microcomputer;

[0090] The power supply module 5 is used to provide the operating voltage for the entire system; the power supply module 5 includes a main power supply and a backup power supply, and the backup power supply is used to prevent power outage when the main power supply is cut off;

[0091] The warning module 4 is configured to receive commands from the control module 2 and issue an alarm. It includes a tire-climbing curb-scratching alarm system and an alarm terminal. Upon receiving the command from the control module 2, the tire-climbing curb-scratching alarm system triggers an alarm mechanism, which emits an alarm tone and other warning information through the alarm terminal to alert the driver to take appropriate evasive measures. Once the driver performs an adjustment operation and the tire is no longer in contact with the curb, the scratch is resolved, and the alarm system ceases to sound. Specific implementation method two:

[0093] The tire sidewall scratch intelligent monitoring device of this embodiment is different from the specific embodiment 1 in that Figure 4 As shown, the information processing module 3 adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator;

[0094] The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13, the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module 1; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier;

[0095] The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module 1;

[0096] When the output voltage of the bridge circuit changes, the signal is transmitted to the input of the first operational amplifier, that is, U3, to generate an inverting input, and U1 can remove the interference signal. The output of the first operational amplifier is connected to the hysteresis comparator composed of the second operational amplifier to generate a square wave signal of a certain frequency. Thus, the voltage-frequency conversion circuit converts the input signal U3 into a square wave voltage with a certain frequency. And transmit the voltage signal to the monitoring module 1. Specific implementation method three:

[0098] This embodiment of an intelligent tire sidewall scratch monitoring device differs from the second embodiment in that, in my country, curb height is generally between 10 and 12 centimeters. To improve the accuracy of the resistive strain sensor in detecting tire sidewall deformation, the wire strain gauge utilizes a quasi-sine-wave coiled wire structure to optimize its ability to sense stress changes. The bridge circuit utilizes a full-bridge differential bridge circuit to accurately capture and reflect tire sidewall deformation information. Specific implementation method four:

[0100] This embodiment provides a tire sidewall scratch intelligent monitoring method, the monitoring method comprising:

[0101] The resistance strain sensor module 6 converts the tire sidewall deformation into a change in the resistance value of a wire strain gauge. The circuit voltage change caused by the change in the resistance value of the wire strain gauge is then output as a signal to the information processing module 3. The resistance strain sensor module 6 can effectively convert the detected tire deformation information into a change in the resistance value.

[0102] The changing voltage output by the Wheatstone bridge circuit is converted into a rectangular wave output voltage of a certain frequency through the information processing module 3, and the rectangular wave output voltage is transmitted to the monitoring module 1 for threshold comparison; the changing voltage output by the bridge circuit is represented as U0, and the rectangular wave output voltage is represented as Rectangular wave output voltage The threshold signal set by the 74HC123 dual monostable trigger For comparison, when When the 74HC123 dual monostable trigger outputs a high level, 74HC123 dual monostable trigger outputs low level;

[0103] The monitoring module 1 compares the frequency of the target signal with the frequency threshold set in the monitoring module 1 and outputs a corresponding electrical signal; the monitoring module 1 includes a 74HC123 dual monostable trigger, the 1st and 2nd pins of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and the sine signal added to the 15th pin of the 74HC123 dual monostable trigger through the VD terminal is used as the set frequency threshold; when the rectangular wave output voltage After inputting into the 74HC123 dual monostable trigger, if the rectangular wave output voltage When the frequency is higher than the frequency threshold set by 74HC123 dual monostable trigger, 74HC123 dual monostable trigger outputs high level; on the contrary, if the rectangular wave output voltage is When the frequency is lower than the set threshold, the output is low level;

[0104] The control module 2 performs logical operations on the output of the information processing module 3 and the monitoring data of the monitoring module 1, evaluates the obtained result information according to the established logic, and then decides whether to activate the early warning module 4 to implement the early warning operation; the control module 2 adopts a single-chip microcomputer;

[0105] The warning module 4 receives the command from the control module 2 and issues an alarm. The warning module 4 includes a tire climbing curb scratch alarm system and an alarm terminal. Upon receiving the command from the control module 2, the tire climbing curb scratch alarm system triggers an alarm mechanism, and the alarm terminal issues an alarm tone and other warning information to warn the driver to take appropriate evasive measures. Once the driver performs an adjustment operation and the tire no longer contacts the curb, the scratch is resolved, and the alarm system stops sounding.

[0106] The power supply module 5 provides the operating voltage for the entire system; the power supply module 5 includes a main power supply and a backup power supply, and the backup power supply prevents power outage when the main power supply is cut off;

[0107] When the monitoring module 1 outputs a high-level signal, it indicates that the tire has climbed the curb and may cause a scratch. At this time, the control module 2 activates the tire climbing and curb scratch alarm system, triggers the alarm mechanism, and sends an alarm bell and other warning information through the alarm terminal; after receiving the warning information, the driver takes necessary measures to keep the vehicle away from the curb, and then the monitoring module 1 will output a low-level signal; thereafter, the control module 2 stops the alarm when it detects the low-level signal; conversely, if the control module 2 detects that the monitoring module 1 outputs a continuous low-level signal, the tire climbing and curb scratch alarm system remains silent and does not trigger the alarm.

[0108] The resistance change caused by deformation detected by the resistance strain sensor is converted into voltage-frequency conversion using a voltage-frequency conversion circuit, and the output signal is converted into a voltage-frequency conversion signal through a 74HC123 dual monostable trigger. The signal is compared with a set threshold and a corresponding potential is generated. After receiving the electrical signal output by monitoring module 1, control module 2 analyzes and processes it, deciding whether to activate warning module 4 to issue an alarm, prompting the driver to take necessary evasive measures. This design significantly reduces the risk of tire sidewall damage when climbing curbs and ensures vehicle safety to a certain extent.

[0109] Wherein, the resistive strain sensor module 6 is arranged on the inner side of the tire sidewall cord layer; each of the resistive strain sensor modules 6 includes a flexible printed circuit (FPC), a metal wire strain gauge and a bridge circuit, the metal wire strain gauge and the bridge circuit are attached to the flexible printed circuit (FPC), the metal wire strain gauge is used to convert the deformation of the tire sidewall into a change in the resistance value of the metal wire strain gauge, and the bridge circuit is used to output the circuit change voltage caused by the resistance value change obtained by the metal wire strain gauge as a signal to the information processing module 3; each resistive strain sensor module 6 includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit;

[0110] Flexible printed circuits (FPCs) are lightweight, thin, and flexible in three dimensions. They are attached to the center of the inner side of the tire's sidewall ply, ensuring a stable sensor operating environment while reducing the risk of circuit damage caused by mechanical stress and protecting the integrity of the tire's ply structure. Resistive strain sensors accurately reflect the degree of tire sidewall deformation by monitoring changes in the resistance of the strain gauge. Specific implementation method five:

[0112] The present embodiment is a method for intelligently monitoring tire sidewall scratches. Unlike the fourth embodiment, the resistive strain sensor module 6 converts the tire sidewall deformation into a resistance change of a wire strain gauge, and then outputs the circuit voltage change caused by the resistance change of the wire strain gauge as a signal to the information processing module 3 in the following process:

[0113] When external force acts on the tire sidewall, the change in resistance reflects the deformation of the strain gauge, as shown in formula (1):

[0114]

[0115] Where: R is the original resistance of the strain gauge; ΔR is the change in the resistance of the strain gauge; l is the original length of the strain gauge; Δl is the change in the length of the strain gauge; r is the original radius of the material used in the strain gauge; Δr is the change in the radius of the material used in the strain gauge; ρ is the original density of the material used in the strain gauge; Δρ is the change in the density of the material used in the strain gauge;

[0116] The sensitivity coefficient of the resistance strain sensor is:

[0117]

[0118] Where ε is the axial strain of the wire, The sensitivity coefficient K1 of metal materials is approximately between 1.7 and 3.6, and the sensitivity coefficient K2 of semiconductor materials is approximately 100.

[0119] Radial strain of the wire ε r The relationship between the axial strain ε is:

[0120] ε r =-με (3)

[0121] μ is the Poisson coefficient, and from formulas (1) and (3) we can get:

[0122]

[0123] Where (1+2μ)ε represents the geometric deformation effect when the resistance value changes relative to the resistor. Represents the piezoresistive effect when the resistance value changes relatively; on the basis of the resistance strain effect, the response of metal materials is mainly manifested as a deformation effect, while the response of semiconductor materials is mainly manifested as a piezoresistive effect. Although semiconductor materials show high sensitivity, their resistance values ​​are extremely sensitive to temperature changes, and thus will change significantly. In contrast, the sensitivity coefficient of metal materials is relatively less dependent on temperature changes. Because when the temperature changes, the resistance value and resistance strain sensitivity coefficient of the semiconductor strain gauge will change significantly. Relatively speaking, the resistance strain coefficient of the metal strain gauge changes relatively little with temperature. At the same time, combined with the values ​​of the material sensitivity coefficients K1 and K2, it is finally determined that the resistance strain sensor of the present invention adopts a metal strain gauge. In order to make a single metal wire with a large resistance value accurately measure the strain amount of the tire sidewall, the present invention coils the metal wire of the strain gauge in a quasi-sine wave shape. This method not only ensures that the metal wire has the resistance value required to measure the voltage of the full-bridge circuit, but also accurately controls the length of the metal wire within an appropriate range to optimize its performance.

[0124] The metal strain gauge can sense the relative change of resistance caused by strain. On the other hand, if the ambient temperature changes, the resistance will also change relatively. Since the strain gauge of the resistance strain sensor has temperature characteristics:

[0125]

[0126] Where, Indicates the relative change in the resistance of the strain gauge caused by the strain change. represents the relative change in the resistance of the strain gauge caused by temperature changes. The temperature characteristics of metal strain gauges may cause "false strain", so the present invention uses a full-bridge differential bridge for temperature compensation to reduce errors. The output voltage of the Wheatstone bridge circuit connected to the resistance strain gauge is recorded as U0, and the input voltage of the bridge is U. The DC bridge balance condition can be obtained:

[0127]

[0128] In a DC bridge: R1R4=R2R3 or Bridge arm ratio The voltage sensitivity of a single-arm bridge (where only R1 changes resistance) is given by:

[0129]

[0130] The combined results are:

[0131]

[0132] In formula (8), the denominator Smaller ones can be ignored;

[0133]

[0134] From formula (9), it can be seen that when n=1, the voltage sensitivity K μ A maximum value can be obtained

[0135] In the actual case of U0 in formula (8), the simplification process, the denominator The actual existence causes the relative change of the actual output voltage U0 and the resistance to be not in a linear relationship. There is a certain nonlinear error between the two, namely:

[0136] Actual output voltage:

[0137] Ideal output voltage:

[0138] Nonlinear error:

[0139] Therefore, the magnitude of the bridge's nonlinear error depends on the magnitude of the relative change in the resistance. In order to keep the bridge operating in an unbalanced state with a small deviation, the strain gauge must be temperature compensated.

[0140] In a full-bridge differential bridge, the bridge arms meet the balance conditions of the bridge under initial conditions; during operation, the resistance of all four bridge arms changes, then:

[0141]

[0142] Where,

[0143] like Then η=0;

[0144] Therefore, in particular, when the bridge arm ratio n = 1, the output voltage expression is:

[0145]

[0146] The present invention adopts a full-bridge differential bridge, wherein:

[0147]

[0148] Combining formulas (2), (15), and (16), we can obtain:

[0149]

[0150] From this, we can see that when the resistance strain gauge is deformed due to scratches on the tire sidewall and its resistance changes, the two bridges of the Wheatstone bridge will no longer be balanced, and the voltage output of the bridge will change accordingly based on the deformation. Specific implementation method six:

[0152] The tire sidewall scratch intelligent monitoring method of this embodiment is different from the specific embodiment 5 in that: Figure 4 As shown, the information processing module 3 adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator;

[0153] The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13 , the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module 1; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier;

[0154] The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module 1;

[0155] When the output voltage of the bridge circuit changes, the signal is transmitted to the input of the first operational amplifier, that is, U3, to generate an inverting input, and the interference signal is removed at U1; the output of the first operational amplifier circuit is connected to the hysteresis comparator to generate an output square wave signal of a certain frequency. The voltage-frequency conversion circuit converts the input signal U3 into a square wave voltage with a certain frequency. And transmit the voltage signal to the monitoring module 1. Specific implementation method seven:

[0157] This embodiment of the intelligent tire sidewall scratch monitoring method differs from the sixth embodiment in that, in my country, curb height is generally between 10 and 12 centimeters. To improve the accuracy of the resistive strain sensor in detecting tire sidewall deformation, the wire strain gauge utilizes a quasi-sine-wave coiled wire structure to optimize its ability to sense stress changes. The bridge circuit utilizes a full-bridge differential bridge circuit to accurately capture and reflect tire sidewall deformation information. Specific implementation method eight:

[0159] The device for intelligently monitoring tire sidewall scratches according to this embodiment is characterized by comprising:

[0160] processor;

[0161] a memory storing executable instructions for the processor;

[0162] Wherein, the processor is configured to execute the steps of the tire sidewall scratch intelligent monitoring method as described in any one of claims 4 to 7 by executing the executable instructions. Specific implementation method nine:

[0164] A computer-readable storage medium of this embodiment is used to store a program, which, when executed, implements the steps of a tire sidewall scratch intelligent monitoring method according to any one of claims 4 to 7.

[0165] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A tire sidewall scratch intelligent monitoring device, characterized by: Its components include monitoring module, control module, information processing module, early warning module, power supply module and a group of resistance strain sensor modules; The resistance strain sensor module is used to convert the deformation of the tire sidewall into the resistance value change of the wire strain gauge, and then output the circuit change voltage caused by the resistance value change obtained by the wire strain gauge as a signal to the information processing module; and the resistance strain sensor module is arranged on the inner side of the tire sidewall cord layer; each resistance strain sensor module includes a flexible circuit board, a wire strain gauge and a bridge circuit, the wire strain gauge and the bridge circuit are attached to the flexible circuit board, and the wire strain gauge is used to convert the deformation of the tire sidewall into the voltage of the wire strain gauge. The bridge circuit is used to output the circuit change voltage caused by the resistance change obtained by the metal wire strain gauge as a signal to the information processing module; every four resistance strain sensor modules constitute a sensor unit, and each resistance strain sensor module includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit; The information processing module is used to convert the changing voltage output by the bridge circuit into a rectangular wave output voltage of a certain frequency, and transmit the rectangular wave output voltage to the monitoring module for threshold comparison; the changing voltage output by the bridge circuit is represented as U0, and the rectangular wave output voltage is represented as The monitoring module is used to compare the frequency of the target signal with the frequency threshold set in the monitoring module and output a corresponding electrical signal; the monitoring module includes a 74HC123 dual monostable trigger, pins 1 and 2 of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and a sinusoidal signal added to pin 15 of the 74HC123 dual monostable trigger through the VD terminal is used as the set frequency threshold; The control module is used to perform logical operations on the output results of the information processing module and the monitoring data of the monitoring module, evaluate the obtained result information according to the established logic, and then decide whether to activate the early warning module to implement the early warning operation; the control module adopts a single-chip microcomputer; The power supply module is used to provide operating voltage for the entire system; The early warning module is used to receive instructions from the control module and issue an alarm. The early warning module includes a tire climbing curb scratch alarm system and an alarm terminal. After receiving the instructions from the control module, the tire climbing curb scratch alarm system will trigger the alarm mechanism and issue an alarm bell and other warning information through the alarm terminal.

2. The intelligent tire sidewall scratch monitoring device according to claim 1, characterized in that: The information processing module adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator; The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13 , the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier; The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module.

3. The intelligent tire sidewall scratch monitoring device according to claim 2, characterized in that: The metal wire strain gauge adopts a metal wire structure that is coiled in a sine wave shape; and the bridge circuit adopts a full-bridge differential bridge circuit.

4. An intelligent monitoring method performed by the device according to any one of claims 1 to 3, characterized in that: The monitoring method comprises: The resistance strain sensor module converts the deformation of the tire sidewall into the resistance value change of the wire strain gauge, and then outputs the circuit change voltage caused by the resistance value change of the wire strain gauge as a signal to the information processing module; The changing voltage output by the bridge circuit is converted into a rectangular wave output voltage of a certain frequency through the information processing module, and the rectangular wave output voltage is transmitted to the monitoring module for threshold comparison; the changing voltage output by the bridge circuit is expressed as U0, and the rectangular wave output voltage is expressed as Rectangular wave output voltage The threshold signal set by the 74HC123 dual monostable trigger For comparison, when When the 74HC123 dual monostable trigger outputs a high level, 74HC123 dual monostable trigger outputs low level; The monitoring module compares the frequency of the target signal with the frequency threshold set in the monitoring module and outputs a corresponding electrical signal; the monitoring module includes a 74HC123 dual monostable trigger, pins 1 and 2 of the 74HC123 dual monostable trigger are connected to the output end of the hysteresis comparator, and a sinusoidal signal is added to pin 15 of the 74HC123 dual monostable trigger through the VD end as the set frequency threshold; when the rectangular wave output voltage After inputting into the 74HC123 dual monostable trigger, if the rectangular wave output voltage When the frequency is higher than the frequency threshold set by 74HC123 dual monostable trigger, 74HC123 dual monostable trigger outputs high level; on the contrary, if the rectangular wave output voltage is When the frequency is lower than the set threshold, the output is low level; The control module performs logical operations on the output results of the information processing module and the monitoring data of the monitoring module, evaluates the obtained result information according to the established logic, and then decides whether to activate the early warning module to implement the early warning operation; the control module adopts a single chip microcomputer; The warning module receives the command from the control module and issues an alarm. The warning module includes a tire climbing curb scratch alarm system and an alarm terminal. After receiving the command from the control module, the tire climbing curb scratch alarm system will trigger an alarm mechanism and issue an alarm bell and other warning information through the alarm terminal; Providing operating voltage to the entire system through the power supply module; When the monitoring module outputs a high-level signal, it indicates that the tire has climbed onto the curb and may have scratched it. At this time, the control module activates the tire climbing and curb scratch alarm system, triggering the alarm mechanism and sending an alarm bell and other warning information through the alarm terminal. After receiving the warning information, the driver takes necessary measures to move the vehicle away from the curb, and then the monitoring module will output a low-level signal. After that, the control module stops the alarm when it detects the low-level signal. Conversely, if the control module detects that the monitoring module outputs a continuous low-level signal, the tire climbing and curb scratch alarm system remains silent and does not trigger the alarm. Among them, the resistance strain sensor module is arranged on the inner side of the tire sidewall cord layer; each of the resistance strain sensor modules includes a flexible circuit board, a metal wire strain gauge and a bridge circuit, the metal wire strain gauge and the bridge circuit are pasted on the flexible circuit board, the metal wire strain gauge is used to convert the deformation of the tire sidewall into a change in the resistance value of the metal wire strain gauge, and the bridge circuit is used to output the circuit change voltage caused by the resistance value change obtained by the metal wire strain gauge as a signal to the information processing module; every four resistance strain sensor modules are a sensor unit, and each resistance strain sensor module 6 includes resistors R1, R2, R3, and R4, the strain grid directions of R1 and R3 are parallel to the stretching direction of the tire sidewall cord layer, the strain grid directions of R2 and R4 are perpendicular to the stretching direction of the tire sidewall cord layer, and R1 and R4 are connected to one diagonal direction of the bridge circuit, and R2 and R3 are connected to one diagonal direction of the bridge circuit.

5. The tire sidewall scratch intelligent monitoring method according to claim 4, characterized in that: The resistance strain sensor module converts the tire sidewall deformation into a resistance change of a wire strain gauge, and then outputs the circuit change voltage caused by the resistance change of the wire strain gauge as a signal to the information processing module as follows: When external force acts on the tire sidewall, the change in resistance reflects the deformation of the strain gauge, as shown in formula (1): Where: R is the original resistance of the strain gauge; ΔR is the change in the resistance of the strain gauge; l is the original length of the strain gauge; Δl is the change in the length of the strain gauge; r is the original radius of the material used in the strain gauge; Δr is the change in the radius of the material used in the strain gauge; ρ is the original density of the material used in the strain gauge; Δρ is the change in the density of the material used in the strain gauge; The sensitivity coefficient of the resistance strain sensor is: Where ε is the axial strain of the wire, The sensitivity coefficient K1 of metal materials is approximately between 1.7 and 3.6, and the sensitivity coefficient K2 of semiconductor materials is approximately 100. Radial strain of the wire ε r The relationship between the axial strain ε is: e r =-with (3) μ is the Poisson coefficient, and from formulas (1) and (3) we can get: Where (1+2μ)ε represents the geometric deformation effect when the resistance value changes relative to the resistor. Indicates the piezoresistive effect when the resistance value changes relative to the resistor; Use metal strain gauges to sense the relative change in resistance caused by strain. If the ambient temperature changes, the resistance will also change relatively. Since the strain gauges of resistance strain sensors have temperature characteristics: Where, Indicates the relative change in the resistance of the strain gauge caused by the strain change. Indicates the relative change in the resistance of the strain gauge caused by temperature changes; a full-bridge differential bridge is used for temperature compensation to reduce errors; the output voltage of the Wheatstone bridge circuit to which the resistance strain gauge is connected is recorded as U0, and the input voltage of the bridge is U. The DC bridge balance condition yields: In a DC bridge: R1R4=R2R3 or Bridge arm ratio The voltage sensitivity of the single-arm bridge is given by: The combined results are: In formula (8), the denominator Smaller ones can be ignored; From formula (9), it can be seen that when n=1, the voltage sensitivity K μ A maximum value can be obtained In the actual case of U0 in formula (8), the simplification process, the denominator The actual existence causes the relative change of the actual output voltage U0 and the resistance to be not in a linear relationship. There is a nonlinear error between the two, namely: Actual output voltage: Ideal output voltage: Nonlinear error: Temperature compensation of strain gauges; In a full-bridge differential bridge, the bridge arms meet the balance conditions of the bridge under initial conditions; during operation, the resistance of all four bridge arms changes, then: Where, like Then η=0; Therefore, when the bridge arm ratio n=1, the expression of the output voltage is: Full-bridge differential bridge, where: Combining formulas (2), (15), and (16), we can obtain: From this, we can see that when the resistance strain gauge is deformed due to scratches on the tire sidewall and its resistance changes, the two bridges of the Wheatstone bridge will no longer be balanced, and the voltage output of the bridge will change accordingly based on the deformation.

6. The tire sidewall scratch intelligent monitoring method according to claim 5, characterized in that: The information processing module adopts a voltage-frequency conversion circuit, including an integrator and a hysteresis comparator; the integrator includes a first operational amplifier, the hysteresis comparator includes a second operational amplifier, and the output end of the first operational amplifier is connected to the input end of the hysteresis comparator; The non-inverting input terminal of the first operational amplifier is grounded through the resistor R9, and the inverting input terminal of the first operational amplifier is connected to the switch SR1, the resistor R8, the resistor R5, the resistor R6, the resistor R 13 , the other end of the switch SR1 is connected to the output end of the second operational amplifier, the other end of the resistor R8 is connected to the voltage signal to be detected, the other end of the resistor R5 is connected to the voltage signal to be detected, the resistor R6 is connected in parallel to the first operational amplifier and the second operational amplifier in series, and the other end of the resistor R6 is connected to the monitoring module; the resistor R 13 The first operational amplifier and the second operational amplifier are connected in parallel; the capacitor C1 is connected in parallel to the inverting input and output of the first operational amplifier, and the output of the first operational amplifier is connected through the resistor R 10 connected to the non-inverting input terminal of the second operational amplifier; The inverting input terminal of the second operational amplifier is grounded; the output terminal of the second operational amplifier is connected to the resistor R 12 , resistor R 11 connected in parallel to the second operational amplifier and resistor R 12 , and the resistor R 11 One end is connected to the non-inverting input of the second operational amplifier, and the resistor R 11 The other end is connected to the monitoring module; When the output voltage of the bridge circuit changes, the signal is transmitted to the input of the first operational amplifier, that is, U3, to generate an inverting input, and the interference signal is removed at U1; the output of the first operational amplifier circuit is connected to the hysteresis comparator to generate an output square wave signal of a certain frequency.

7. The tire sidewall scratch intelligent monitoring method according to claim 6, characterized in that: The metal wire strain gauge adopts a metal wire structure that is coiled in a sine wave shape; and the bridge circuit adopts a full-bridge differential bridge circuit.

8. A device for intelligent monitoring of tire sidewall scratches, characterized in that: include: processor; a memory storing executable instructions for the processor; Wherein, the processor is configured to execute the steps of the tire sidewall scratch intelligent monitoring method as described in any one of claims 4 to 7 by executing the executable instructions.

9. A computer-readable storage medium for storing a program, characterized in that: When the program is executed, the steps of a tire sidewall scratch intelligent monitoring method described in any one of claims 4 to 7 are implemented.

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