Tire condition monitoring method and tire condition detection apparatus

Abstract

A tire condition monitoring method, comprising: in an operation state, setting the sampling period of a tire condition detection apparatus to be T1 and the sending period of the tire condition detection apparatus to be T2; on the basis of a change of tire pressure sampling values, determining whether a first set condition is satisfied; and if the first set condition is satisfied, the tire condition detection apparatus entering a tire burst monitoring state; and, in the tire burst monitoring state, setting the sending period of the tire condition detection apparatus to be T3, T3 being less than T2; on the basis of the change of the tire pressure sampling values, determining whether a second set condition is satisfied; and if the second set condition is satisfied, the tire condition detection apparatus outputting a tire burst alarm flag bit. Further disclosed is a tire condition detection device using the described monitoring method. The present monitoring method can achieve the function of rapid tire burst monitoring.

Description

Tire condition monitoring method and tire condition detection device Technical Field

[0001] The present invention relates to the field of vehicle automatic driving technology, and in particular to a tire condition monitoring method and a tire condition detection device. Background Art

[0002] Tire condition monitoring systems (TCMs) are safety systems that ensure the smooth operation of vehicles. As a regulatory requirement, they have seen rapid growth in the automotive market in recent years. By monitoring tire health in real time and promptly alerting drivers to abnormal conditions such as leaks or excessive temperatures, they minimize tire damage and provide a strong guarantee for safe vehicle operation. However, the number of accidents caused by tire blowouts, due to various reasons, remains high each year, posing significant threats to life and property losses for both individuals and society.

[0003] Among them, tire blowout is the phenomenon that a car tire loses most of the air in a very short time. It is the most dangerous condition for tires. When a car tire blows out, the running state of the car changes dramatically. If timely braking or steering control is not performed, the car will be in danger of yaw, rollover or tailspin, which seriously threatens the safety of the car. Therefore, the research on tire blowout warning and control is of great significance to the safety function of the whole vehicle.

[0004] When a tire blows out while driving, the dynamics of the vehicle indicate that it takes time for the vehicle's control to become unbalanced and its operating state to change dramatically. This short window of time often allows human control to lose its initiative, leading to accidents. Therefore, ensuring that the entire vehicle receives timely notification of tire blowouts and can quickly and automatically respond to prevent accidents is an urgent issue.

[0005] Summary of the Invention

[0006] In response to the above-mentioned problems in the prior art, the present invention proposes a tire condition monitoring method and a tire condition detection device, which can quickly collect tire pressure in a low-power mode and determine whether a tire blowout occurs by the drop in tire pressure, thereby achieving the function of rapid tire blowout monitoring.

[0007] Specifically, the present invention provides a tire condition monitoring method applicable to a tire condition detection device, wherein the tire condition detection device is used to periodically detect tire conditions and send detection data externally. The tire condition monitoring method includes the following steps:

[0008] In the running state, set the sampling period of the tire condition detection device to T1 and the transmission period to T2; the tire condition detection device determines whether it meets the first set condition based on the change in the tire pressure sampling value. If it meets the first set condition, the tire condition detection device enters the tire burst monitoring state;

[0009] In the tire burst monitoring state, set the transmission period of the tire condition detection device to T3, where T3 < T2. The tire condition detection device determines whether it meets the second set condition based on the change in the tire pressure sampling value. If it meets the second set condition, the tire condition detection device outputs a tire burst alarm flag bit.

[0010] According to an embodiment of the present invention, the first set condition is:

[0011] The difference between the tire pressure sampling value of the current sampling period and the tire pressure sampling value transmitted in the previous transmission period is less than or equal to the first threshold value a.

[0012] According to an embodiment of the present invention, -30 kPa ≤ the first threshold value a ≤ -7 kPa.

[0013] According to an embodiment of the present invention, the second set condition includes:

[0014] Condition 1: The difference between the current tire pressure sampling value collected in m1 consecutive sampling periods and the tire pressure sampling value of the previous sampling period is less than or equal to the second threshold value b;

[0015] If condition 1 is satisfied, it is considered to meet the second set condition.

[0016] According to an embodiment of the present invention, the second threshold value b ≤ -7 kPa, and m1 is a natural number and m1 ≤ 4.

[0017] According to an embodiment of the present invention, the second set condition further includes:

[0018] Condition 2: The difference between the tire pressure sampling value collected in the current sampling period and the tire pressure sampling value transmitted in the last transmission period T2 before the tire condition detection device enters the tire burst monitoring state is less than or equal to the third threshold value c;

[0019] If condition 1 is satisfied, then it is judged whether condition 2 is satisfied. If both condition 2 are satisfied, it is considered to meet the second set condition.

[0020] According to an embodiment of the present invention, the third threshold value c ≤ -40 kPa.

[0021] According to an embodiment of the present invention, if condition 1 is satisfied, then it is judged whether condition 2 is satisfied. If condition 2 is not satisfied, wait for m2 sampling periods T1;

[0022] If condition 2 is satisfied within m2 sampling periods, it is considered that the second set condition is met.

[0023] According to one embodiment of the present invention, the third threshold c≤-40 kPa, m2 is a natural number and m2≤4.

[0024] The present invention further provides a tire condition detection device for implementing the aforementioned tire condition monitoring method, the tire condition detection device comprising:

[0025] The sampling module collects tire pressure based on the sampling period T1 and obtains the tire pressure sampling value;

[0026] A sending module, configured to send the tire pressure sampling value based on a sending period T2, send the tire pressure sampling value based on a sending period T3, or send a tire blowout alarm flag;

[0027] A comparison module is used to compare changes in tire pressure sampling values;

[0028] a first judging module, for judging whether a first set condition is met based on the comparison result of the comparing module;

[0029] The second judging module judges whether a second set condition is met based on the comparison result of the comparing module.

[0030] The present invention provides a tire condition monitoring method and a tire condition detection device, which enable the tire condition detection device to switch from an operating state to a tire blowout monitoring state. During this process, an appropriate sampling period T1 is maintained, and the sending period T2 is adjusted to the sending period T3 to increase the sending frequency, thereby meeting the requirements of rapid tire pressure collection in a low-power mode. At the moment of a tire blowout, the tire blowout monitoring state is entered based on the tire pressure change, and the tire pressure change is continuously judged. The tire blowout alarm flag can be quickly output to the outside through the sending period T3, thereby achieving the function of rapid tire blowout monitoring, so that the entire vehicle can receive the tire blowout alarm information in time and quickly make an emergency automatic response to achieve the purpose of protecting vehicle safety.

[0031] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are included to provide further explanation of the present invention and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention.

[0033] In the attached figure:

[0034] FIG1 shows a schematic structural diagram of a complete vehicle assembly according to an embodiment of the present invention.

[0035] FIG2 shows a flowchart of a tire condition monitoring method according to an embodiment of the present invention.

[0036] FIG3 shows a schematic diagram of tire pressure sampling data with a sampling period T1 of 50 ms.

[0037] FIG4A shows a first schematic diagram of tire pressure change after a tire blowout occurs with a sampling period T1 of 50 ms.

[0038] FIG4B shows a second schematic diagram of tire pressure changes after a tire blowout occurs with a sampling period T1 of 50 ms.

[0039] FIG4C shows a third schematic diagram of tire pressure changes after a tire blowout occurs with a sampling period T1 of 50 ms.

[0040] FIG4D shows a fourth schematic diagram of tire pressure changes after a tire blowout occurs with a sampling period T1 of 50 ms.

[0041] FIG5A shows a first schematic diagram of tire pressure value changes when a sampling period T1 of 50 ms is observed on a pothole-prone road.

[0042] FIG5B shows a second schematic diagram of tire pressure value changes after a pothole road surface with a sampling period T1 of 50 ms.

[0043] FIG6 shows a schematic structural diagram of a tire condition detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0048] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0050] FIG1 shows a schematic structural diagram of a vehicle assembly according to an embodiment of the present invention. As shown in the figure, taking a four-wheeled vehicle as an example, a tire condition detection device 102 is installed in each of the four tires 101 of the vehicle body 100. The device is primarily used to collect information such as tire pressure and transmit it externally. Accordingly, a signal receiving processor (ECU) 103 is disposed on the side of the vehicle body 100. The tire condition detection device 102 typically includes a pressure detection sensor and a power module, which is a built-in battery. The pressure detection sensor periodically detects the air pressure inside the tire 101, and the tire condition detection device 102 transmits the detection information to the signal receiving processor 103 via a wireless signal. When a tire 101 blew, the tire condition detection device 101 quickly responded by detecting the change in tire 101's air pressure and promptly transmitted the bleed information via a wireless signal. The signal receiving processor 103 then received the information and transmitted it to the vehicle via the CAN bus 104.

[0051] Figure 2 shows a flowchart of a tire condition monitoring method according to an embodiment of the present invention. As shown in the figure, the present invention provides a tire condition monitoring method applicable to a tire condition detection device. The tire condition detection device is configured to periodically detect tire conditions and transmit detection data. The tire condition monitoring method includes the following steps:

[0052] In the operating state, the tire condition detection device has a sampling period of T1, i.e., a period for collecting tire pressure; a transmission period of T2, i.e., a period for transmitting the collected signal. The tire condition detection device determines whether a first set condition is met based on changes in the sampled tire pressure values. If the first set condition is met, the tire condition detection device enters a tire blowout monitoring state.

[0053] It should be noted that in existing technologies, the acquisition cycle of tire condition monitoring devices is generally set between 1s and 30s, and the transmission cycle is set between 30s and 60s. This is primarily due to the small and lightweight size of the pressure detection sensor, which is powered by a 2032 button cell battery, which has limited battery capacity. This creates a conflict between the pursuit of timely data updates and ensuring a long service life. Currently, OEMs require a 10-year service life for pressure detection sensors. While using a larger-capacity battery would increase the acquisition and transmission frequency, this would significantly increase costs. Therefore, it is crucial to select appropriate sampling and transmission cycles to minimize the power consumption of the tire condition monitoring device. When the vehicle is operating normally, a 30s acquisition cycle and a 60s transmission cycle are used as the parameters. Based on a two-hour daily driving evaluation, achieving a 10-year service life is not difficult. However, based on the time requirement for tire blowout response (defined as the time from when a blowout occurs to when the vehicle receives the blowout notification), most OEMs require this response time to be within 300ms. If the tire pressure sampling cycle remains constant at 1s to 30s, this requirement for response time will not be met. Maintaining a short transmission cycle (300ms) is limited by power consumption and service life. Therefore, to meet the required response time to a tire blowout, the present invention sets sampling cycle T1 to 20ms to 100ms (relative to traditional pressure sensors, the pressure sampling cycle is faster); and transmission cycle T2 is set to 30s to 60s, consistent with traditional pressure sensors. By detecting changes in tire pressure, the tire condition detection device enters a tire blowout monitoring state, thereby adjusting the transmission cycle to meet the required response time.

[0054] Furthermore, in the tire blowout monitoring state, the sampling period T1 remains unchanged, and the transmission period of the tire condition detection device is set to T3, which is significantly shorter than T2. ​​Transmission period T3 is preferably set to 50ms to 150ms. The tire condition detection device determines whether the second set condition is met based on the change in the tire pressure sample value. If the second set condition is met, the tire condition detection device outputs a tire blowout alarm flag.

[0055] It is easy to understand that the tire condition monitoring method provided by the present invention enables the tire condition detection device to switch from the operating state to the tire blowout monitoring state, shortening the transmission cycle, thereby meeting the tire blowout reaction time requirement under low energy consumption usage state.

[0056] Preferably, the first set condition is: the difference between the tire pressure sample value P_Cur in the current sampling cycle and the tire pressure sample value P_Tx transmitted in the previous transmission cycle is less than or equal to a first threshold value a. If the first set condition is met, it indicates a significant drop in tire pressure, and the tire condition detection device enters the tire blowout monitoring state. More preferably, -30kPa ≤ first threshold value a ≤ -7kPa. The first threshold value a is primarily used to determine whether there is a change in tire pressure. When a change occurs, the tire condition detection device enters the tire blowout monitoring state and increases the transmission frequency (transmission cycle), allowing real-time transmission of tire pressure values ​​to the entire vehicle. The value of the first threshold value a is affected by pressure sampling accuracy, tire pressure changes during normal driving, and other factors. To meet the requirements of tire blowout monitoring, the first threshold value a is set to a negative value based on the physical characteristics of pressure changes during a blowout. If the value is set too large (in absolute value), it will be difficult to enter the tire blowout monitoring state; if it is set too small, it will frequently enter the tire blowout monitoring state, seriously consuming power and affecting the overall product lifespan.

[0057] Figure 3 shows a schematic diagram of tire pressure sampling data with a sampling period T1 of 50ms. As shown in the figure, a tire with a 19-inch rim is inflated to 260kPa and driven normally. The detected pressure value is sampled and outputted every 50ms. The horizontal axis in the figure represents sampling time, and the vertical axis represents tire pressure. The curve shows that the detected tire pressure fluctuates, but remains within a reasonable range. This fluctuation should be considered when setting the first threshold a to avoid frequent triggering. The total time it takes for the tire pressure to change after a blowout is related to the blowout hole diameter and pressure. For a 155R12C tire inflated to 220kPa, the blowout lasts approximately 1.6s with a flow cross-section diameter of 10mm; approximately 0.6s with a flow cross-section diameter of 15mm; approximately 0.3s with a flow cross-section diameter of 20mm; and approximately 0.16s with a flow cross-section diameter of 25mm.

[0058] The theoretical model of tire pressure change is as follows:

[0059] where n i is the change in tire gas volume; R s =8.31441J / (mol*K), which is the thermodynamic constant of air; T is the thermodynamic temperature of gas; S t is the tire flow cross-sectional area; V a is the gas flow velocity; ρ a is the gas density; M = 0.029 kg / mol, is the molar mass of air; V t is the tire carcass gas volume; △t is the time change.

[0060] When the tire and environment are determined, △P / △t is only related to S t , V aA positive correlation exists: the larger the leak diameter, the shorter the total leakage time and the greater the pressure drop per unit time. The pressure curves for different cross-sectional diameters show that the pressure drop rate is greatest at the moment of a blowout, and the leakage rate gradually decreases as the total pressure decreases. Based on the pressure curve and pressure sampling fluctuations during a blowout, the range is set to -30kPa ≤ the first threshold a ≤ -7kPa to ensure effectiveness and timeliness of blowout detection.

[0061] Preferably, the second setting condition includes:

[0062] Condition 1: The difference between the current tire pressure sampling value collected in m1 consecutive sampling cycles and the tire pressure sampling value in the previous sampling cycle is less than or equal to the second threshold value b;

[0063] If condition 1 is satisfied, it is considered that the second set condition is met, and the tire condition detection device outputs a tire blowout alarm flag.

[0064] The second threshold b and parameter m1 serve as condition 1 for determining a tire blowout. After entering the tire blowout monitoring state, the sampling period is T1 and the transmission period is T3. At this time, the current sample value P_Cur and the sample value P_Former from the previous sampling period are the tire pressure samples from two times before and after sampling period T1. The second threshold b represents the tire pressure drop during time T1 and is a negative value. m1 is the number of times P_Cur - P_Former ≤ b is satisfied. m1 is a positive integer. If m1 is 2, it means that P_Cur - P_Former ≤ b has been satisfied twice in a row.

[0065] Figure 4A shows a schematic diagram of tire pressure changes after a tire blowout with a sampling period T1 of 50ms. Figure 4B shows a schematic diagram of tire pressure changes after a tire blowout with a sampling period T1 of 50ms. Figure 4C shows a schematic diagram of tire pressure changes after a tire blowout with a sampling period T1 of 50ms. Figure 4D shows a schematic diagram of tire pressure changes after a tire blowout with a sampling period T1 of 50ms. Figures 4A to 4D record the results of four tests. When the tire was inflated to 270kPa, an actual tire blowout test was performed with a sampling period T1 of 50ms, and the pressure change curves before and after were recorded. The horizontal axis in the figure is the number of times, and the vertical axis is the tire pressure change value each time (P_Cur-P_Former). This shows that the pressure change rate will be relatively large in the first few times when the tire blows out, and then gradually slows down.

[0066] Here, we also need to consider the pressure changes of the tires when they pass through potholes or are impacted in a short period of time. Figure 5A shows a schematic diagram of the change of tire pressure values ​​when passing through potholes with a sampling period T1 of 50ms. Figure 5B shows a schematic diagram of the change of tire pressure values ​​when passing through potholes with a sampling period T1 of 50ms. Figures 5A and 5B record the results of two tests, with the horizontal axis representing the number of times and the vertical axis representing the tire pressure change value each time. As shown in the figure, when the tire passes through potholes or is impacted, the force applied for a short period of time will cause the tire pressure to rise first and then fall, and this impact time is generally relatively short. From the sampling data, when the sampling period is 50ms, the change value is generally positive (increase), then negative (fall), and then maintains stability, and it is difficult to have a continuous downward trend. We can avoid the problem of abnormal pressure changes caused by passing through potholes or being impacted by the judgment requirement of continuous decline.

[0067] Taking into account tire pressure changes caused by a tire blowout and driving over potholes, the second threshold b and parameter m1 serve as condition 1 for determining a tire blowout. A large value for m1 can affect the timing of the tire blowout status output. Therefore, the second threshold b is set to ≤ -7 kPa, and m1 is a natural number with a value of m1 ≤ 4. The preferred value is b = -7 kPa, and m1 is 2.

[0068] Preferably, the second setting condition further includes:

[0069] Condition 2: The difference between the tire pressure sample value P_Cur collected in the current sampling period and the tire pressure sample value P_Tx0 sent in the last sending period T2 before the tire condition detection device enters the tire blowout monitoring state is less than or equal to the third threshold value c;

[0070] If condition 1 is met, it is determined whether condition 2 is met. If condition 2 is met at the same time, it is considered that the second set condition is met.

[0071] To ensure the reliability of the tire blowout warning flag output, condition 2 is set. In addition to meeting condition 1, P_Cur - P_Tx0 ≤ third threshold c. That is, in the tire blowout monitoring state, the tire warning flag is only output if condition 2, corresponding to the tire pressure change, is met. More preferably, third threshold c ≤ -40 kPa.

[0072] Optionally, if condition 1 is met, determine whether condition 2 is met; if condition 2 is not met, wait for m2 sampling periods T1;

[0073] If condition 2 is satisfied within m2 sampling periods T1, it is considered that the second set condition is met.

[0074] Due to certain special circumstances, the rate of decrease in tire pressure is relatively slow. In order to avoid missed reports, a sampling period wait is set, and the waiting time is m2 sampling periods T1. That is, for the case where condition 1 is met but condition 2 is not met at the same time, P_Cur is updated with the next sampled air pressure value, and then it is judged that P_Cur-P_Tx0≤the third threshold c; in the m2 waiting periods, if there is a situation where both condition 1 and condition 2 are met at the same time, the tire alarm flag is output, if not, the judgment of condition 1 is returned to the judgment. More preferably, the third threshold c≤-40kPa, m2 is a natural number and m2≤4. Preferably, the third threshold c=-40kPa, and m2 is 2. It should be noted that when it is judged that the tire pressure change meets the output alarm condition, the alarm flag is output immediately without waiting for the next transmission period.

[0075] As will be readily understood, the tire condition monitoring device can be configured to exit the tire blowout monitoring state. For example, if the first threshold a and second threshold b conditions are not met, the device can exit the tire blowout monitoring state after sampling data n times. The device then enters the operating state, reducing power consumption by shortening the transmission period from T3 to T2. n is a preset integer value, and its duration can be set to an integer multiple of the sampling period T1, for example, 2 seconds.

[0076] Theoretically, the tire condition monitoring device sets the pressure sampling period T1 to 50ms while the vehicle is in motion, with t0 being the first sampling moment. Event changes starting at t0 are observed. Assuming a tire blowout occurs between t0 and t1, an abnormal change in tire pressure is confirmed at t1. Condition 1 is confirmed at t2 and t3, and condition 2 is confirmed at T3. When the set conditions are met, the total tire blowout response time is calculated as follows:

[0077] S1: The time from the occurrence of a tire blowout to the tire condition detection device sending out a tire blowout alarm flag is less than 150ms (t0~t3)

[0078] S2: The wireless signal transmission time of the tire condition detection device. Since the signal receiving processor is installed on the vehicle body side, the transmission distance is relatively short, generally less than 5 meters within the vehicle range. The time from the tire condition detection device to the signal receiving processor can be ignored.

[0079] S3: Signal receiving processor processing time, which is determined by the transmission baud rate and MCU processing. The total time is generally less than 20ms.

[0080] Theoretically, the total time from the occurrence of a tire blowout event to the output of the tire blowout status by the signal receiving processor is less than 170ms. Considering the need for conditions 2 to pass through times t4 and t5, this adds 100ms. The tire blowout status can be output within 270ms, thus meeting the design requirement of a 300ms tire blowout response time.

[0081] In actual vehicle testing, a vehicle driving at speeds exceeding 60 km / h through a tire blowout test device was subjected to a tire blowout event. The vehicle's ABS vibration was used as a reference to determine when the blowout occurred, and the reaction time was calculated after receiving the blowout status signal. Using the tire condition monitoring method of the present invention, the blowout reaction time met the expected response time, meeting the overall requirement of outputting the blowout status within 300 milliseconds.

[0082] FIG6 shows a schematic diagram of the structure of a tire condition detection device according to an embodiment of the present invention. As shown in the figure, the present invention further provides a tire condition detection device 600 for implementing the aforementioned tire condition monitoring method. The tire condition detection device 600 includes:

[0083] The sampling module 601 is used to collect tire pressure based on the sampling period T1 to obtain tire pressure sampling values. The sampling module can be a pressure monitoring sensor.

[0084] The sending module 602 is configured to send the collected tire pressure sample values ​​based on the sending period T2, or send the collected tire pressure sample values ​​based on the sending period T3, or send a tire blowout alarm flag to the signal receiving processor;

[0085] Comparison module 603, used to compare changes in tire pressure sampling values;

[0086] A first judging module 604 is configured to judge whether a first set condition is met based on the comparison result of the comparing module 603;

[0087] The second judgment module 605 is configured to judge whether a second set condition is met based on the comparison result of the comparison module 603 .

[0088] The specific implementation and technical effects of the tire condition detection device 600 may be referred to the embodiment of the tire condition monitoring method provided by the present invention, and will not be described in detail here.

[0089] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A tire condition monitoring method, applicable to a tire condition detection device, wherein the tire condition detection device is used to periodically detect tire conditions and send detection data externally, the tire condition monitoring method comprising the steps of: In the running state, the sampling period of the tire condition detection device is set to T1, and the sending period is set to T2; the tire condition detection device determines whether the first set condition is met based on the change of the tire pressure sampling value, and if the first set condition is met, the tire condition detection device enters the tire blowout monitoring state; In the tire blowout monitoring state, the sending period of the tire condition detection device is set to T3, T3<T2, and the tire condition detection device determines whether the second set condition is met based on the change of the tire pressure sampling value. If the second set condition is met, the tire condition detection device outputs a tire blowout alarm flag.

2. The tire condition monitoring method according to claim 1, characterized in that: The first setting condition is: The difference between the tire pressure sampling value of the current sampling cycle and the tire pressure sampling value sent in the previous sending cycle is less than or equal to the first threshold a.

3. The tire condition monitoring method according to claim 2, characterized in that: -30kPa≤first threshold a≤-7kPa.

4. The tire condition monitoring method according to claim 1, characterized in that: The second setting condition includes: Condition 1: the difference between the current tire pressure sampling value collected in m1 consecutive sampling cycles and the tire pressure sampling value in the previous sampling cycle is less than or equal to the second threshold value b; If condition 1 is met, it is considered that the second setting condition is met.

5. The tire condition monitoring method according to claim 4, characterized in that: The second threshold value b≤-7kPa, m1 is a natural number and m1≤4.

6. The tire condition monitoring method according to claim 4, characterized in that: The second setting condition also includes: Condition 2: the difference between the tire pressure sampling value collected in the current sampling cycle and the tire pressure sampling value sent in the last sending cycle T2 before the tire condition detection device enters the tire blowout monitoring state is less than or equal to the third threshold value c; If condition 1 is met, it is determined whether condition 2 is met. If condition 2 is met at the same time, it is considered that the second set condition is met.

7. The tire condition monitoring method according to claim 6, characterized in that: The third threshold value c≤-40kPa.

8. The tire condition monitoring method according to claim 6, characterized in that: If condition 1 is met, determine whether condition 2 is met. If condition 2 is not met, wait for m2 sampling cycles T1; If condition 2 is satisfied within m2 sampling periods, it is considered that the second set condition is met.

9. The tire condition monitoring method according to claim 8, characterized in that: The third threshold c≤-40kPa, m2 is a natural number and m2≤4.

10. A tire condition detection device, used to implement the tire condition monitoring method according to claim 1, characterized in that: The tire condition detection device comprises: The sampling module collects tire pressure based on the sampling period T1 and obtains tire pressure sampling values; A sending module, which sends the tire pressure sampling value based on a sending period T2, sends the tire pressure sampling value based on a sending period T3, or sends a tire blowout alarm flag; A comparison module, used to compare changes in tire pressure sampling values; A first judging module, for judging whether a first setting condition is met based on the comparison result of the comparing module; The second judging module judges whether a second setting condition is met based on the comparison result of the comparing module.

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