A tire condition monitoring method and a tire condition monitoring device

Abstract

The application relates to a tire condition monitoring method and a tire condition detection device. The tire condition monitoring method comprises the following steps: in a running state, setting a sampling period of the tire condition detection device as T1 and a sending period as T2; judging whether a change of a tire pressure sampling value meets a first set condition, if the first set condition is met, the tire condition detection device enters a tire burst monitoring state; in the tire burst monitoring state, setting a sending period of the tire condition detection device as T3, T3 < T2, judging whether a change of the tire pressure sampling value meets a second set condition, if the second set condition is met, the tire condition detection device outputs a tire burst alarm mark bit. The application provides a tire condition monitoring method and a tire condition detection device, and the tire burst rapid monitoring function can be realized.

Description

Technical Field

[0001] This invention relates to the field of autonomous driving technology, and in particular to a tire condition monitoring method and a tire condition detection device. Background Technology

[0002] Tire condition monitoring systems (TVMs) are essential safety systems for ensuring the proper functioning of vehicles. As a legally mandated feature, TVMs have seen rapid development in the automotive market in recent years. Because they can monitor the real-time condition of tires, they can promptly warn drivers of abnormal conditions such as leaks or overheating, thus minimizing tire damage and providing a strong guarantee for safe vehicle operation. However, accidents caused by tire blowouts due to various reasons remain high each year, posing a significant threat to life and causing substantial property damage to society and individuals.

[0003] Tire blowout is the phenomenon of a car tire losing most of its air in a very short time, and it is the most dangerous situation a tire can experience. When a tire blows out, the car's operating state changes drastically. If timely braking or steering control is not performed, the car may veer, roll over, or fishtail, seriously threatening the safety of the vehicle. Therefore, research on tire blowout warning and control is of great significance to the overall safety function of the vehicle.

[0004] When a tire blows out while a vehicle is in motion, according to vehicle dynamics, there is a very short time between the onset of the blowout and the vehicle's loss of control, resulting in a rapid change in the vehicle's operating state. Human intervention often misses this window, leading to an accident. Therefore, how to enable the vehicle to promptly receive information about a tire blowout and quickly implement an automatic emergency response to protect vehicle safety is a pressing issue that needs to be addressed. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention proposes a tire condition monitoring method and a tire condition detection device, which can rapidly collect tire pressure in a low-power mode and determine whether a tire blowout has occurred by detecting a drop in tire pressure, thereby achieving the function of rapid tire blowout detection.

[0006] Specifically, this invention proposes a tire condition monitoring method, applicable to a tire condition detection device, which is used to periodically detect tire condition and send detection data externally. The tire condition monitoring method includes the following steps: In operation, the sampling period of the tire condition detection device is set to T1 and the transmission period is set to T2. The tire condition detection device determines whether the first set condition is met based on the change in the tire pressure sampling value. 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 cycle of the tire condition detection device is set to T3, where T3 < T2. The tire condition detection device determines whether the second set condition is met based on the change in the tire pressure sampling value. If the second set condition is met, the tire condition detection device outputs a tire blowout alarm flag.

[0007] According to one embodiment of the present invention, the first set condition is: The difference between the tire pressure sample value in the current sampling period and the tire pressure sample value sent in the previous sending period is less than or equal to the first threshold a.

[0008] According to one embodiment of the present invention, -30kPa ≤ first threshold a ≤ -7kPa.

[0009] According to one embodiment of the present invention, the second set condition includes: Condition 1: The difference between the current tire pressure sample value collected in m1 consecutive sampling cycles and the tire pressure sample value of the previous sampling cycle is less than or equal to the second threshold b. If condition 1 is met, then the second condition is considered to be met.

[0010] According to one embodiment of the present invention, the second threshold b ≤ -7 kPa, and m1 is a natural number and m1 ≤ 4.

[0011] According to one embodiment of the present invention, the second setting condition further includes: Condition 2: The difference between the tire pressure sample value collected in the current sampling cycle and the tire pressure sample value sent in the last transmission cycle T2 before the tire condition detection device enters the blowout monitoring state is less than or equal to the third threshold c. If condition 1 is met, then it is determined whether condition 2 is met. If both conditions 2 and condition 2 are met, then it is considered to meet the second set condition.

[0012] According to one embodiment of the present invention, the third threshold c ≤ -40 kPa.

[0013] According to one embodiment of the present invention, if condition 1 is satisfied, then it is determined whether condition 2 is satisfied; if condition 2 is not satisfied, then wait for m2 sampling periods T1. If condition 2 is met within m2 sampling periods, then the second set condition is considered to be met.

[0014] According to one embodiment of the present invention, the third threshold c ≤ -40 kPa, and m2 is a natural number and m2 ≤ 4.

[0015] The present invention also provides a tire condition detection device for implementing the aforementioned tire condition monitoring method, the tire condition detection device comprising: The sampling module collects tire pressure based on the sampling period T1 to obtain the tire pressure sampling value; The sending module sends the tire pressure sampling value based on the sending period T2, sends the tire pressure sampling value based on the sending period T3, or sends the tire blowout alarm flag bit; The comparison module is used to compare changes in tire pressure sampling values; The first judgment module determines whether the first set condition is met based on the comparison result of the comparison module; The second judgment module determines whether the second set condition is met based on the comparison result of the comparison module.

[0016] This invention provides a tire condition monitoring method and a tire condition detection device, enabling 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 transmission period T2 is adjusted to a transmission period T3 to increase the transmission frequency. This satisfies the requirement of rapid tire pressure acquisition in low-power mode. At the moment of a tire blowout, the device enters the tire blowout monitoring state based on tire pressure changes and continuously judges tire pressure changes. Through the transmission period T3, a tire blowout alarm flag can be quickly output, thereby achieving the function of rapid tire blowout monitoring. This allows the vehicle to receive tire blowout alarm information in a timely manner and quickly make an emergency automatic response to protect vehicle safety.

[0017] It should be understood that the above general description and the following detailed description of the present invention are exemplary and illustrative, and are intended to provide further explanation of the present invention. Attached Figure Description

[0018] The accompanying drawings are included to provide further explanation of the invention; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention. In the drawings: Figure 1 A schematic diagram of the vehicle assembly structure according to an embodiment of the present invention is shown.

[0019] Figure 2 A flowchart of a tire condition monitoring method according to an embodiment of the present invention is shown.

[0020] Figure 3 A schematic diagram of tire pressure sampling data with a sampling period T1 of 50ms is shown.

[0021] Figure 4A This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 1 .

[0022] Figure 4B This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 2 .

[0023] Figure 4C This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 3 .

[0024] Figure 4D The diagram below shows the tire pressure change after a tire blowout with a sampling period T1 of 50ms.

[0025] Figure 5A This diagram illustrates the change in tire pressure over a sampling period T1 of 50ms on a bumpy road surface. Figure 1 .

[0026] Figure 5B This diagram illustrates the change in tire pressure over a sampling period T1 of 50ms on a bumpy road surface. Figure 2 .

[0027] Figure 6 A schematic diagram of a tire condition detection device according to an embodiment of the present invention is shown. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0032] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely 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. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0034] Figure 1A schematic diagram of the vehicle assembly according to an embodiment of the present invention is shown. As shown, 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, mainly used to collect information such as tire pressure and transmit it outwards. Correspondingly, a signal receiving processor (ECU) 103 is arranged on the side of the vehicle body 100. The tire condition detection device 102 typically contains a pressure detection sensor and a power module, with the power module being 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 wireless signal. When a tire 101 blows out, the tire condition detection device 101 reacts quickly by detecting the change in tire pressure and promptly transmits the blowout information via wireless signal. The signal receiving processor 103 receives the information and transmits it to the entire vehicle via the CAN bus 104.

[0035] Figure 2 A flowchart of a tire condition monitoring method according to an embodiment of the present invention is shown. As shown, the present invention provides a tire condition monitoring method applicable to a tire condition detection device. The tire condition detection device is used to periodically detect tire condition and transmit detection data externally. The tire condition monitoring method includes the following steps: In operation, the sampling period of the tire condition detection device is set to T1, meaning the period for collecting tire pressure data is T1; the transmission period is set to T2, meaning the period for transmitting the collected signals is T2. The tire condition detection device determines whether a first set condition is met based on changes in the tire pressure sampling value. If the first set condition is met, the tire condition detection device enters the tire blowout monitoring state.

[0036] It should be noted that in existing technologies, the data acquisition cycle of tire condition detection devices is generally set to 1-30 seconds, and the transmission cycle to 30-60 seconds. This is mainly due to the small size and light weight of the pressure sensors, which are powered by 2032 button batteries with limited capacity. There is a conflict between pursuing timely data updates and ensuring lifespan. Currently, OEMs require pressure sensors to have a lifespan of 10 years. While using large-capacity batteries could increase the acquisition and transmission frequency, it would significantly increase costs. Therefore, choosing appropriate sampling and transmission cycles to reduce the power consumption of the tire condition detection device is crucial. When the vehicle is driving normally, using a 30-second acquisition cycle and a 60-second transmission cycle as settings, and assessing 2 hours of driving per day, achieving a 10-year lifespan is not difficult. However, based on the time requirements for tire blowout response (defined as the time from the occurrence of a blowout to the vehicle receiving the blowout information), most OEMs require this response time to be within 300ms. If the tire pressure sampling cycle remains unchanged at 1-30 seconds, it will be impossible to meet the requirements for blowout response time. Maintaining a short transmission cycle (300ms) is limited by power consumption and lifespan. Therefore, in this invention, to meet the time requirements for tire blowout response, the sampling period T1 is set to 20ms–100ms (faster than traditional pressure sensors); the transmission period T2 is set to 30s–60s, consistent with traditional pressure sensors. By detecting changes in tire pressure, the tire condition detection device enters blowout monitoring mode, thereby changing the transmission cycle to meet the blowout response time requirements.

[0037] Furthermore, under tire blowout monitoring conditions, the sampling period T1 remains unchanged, and the transmission period of the tire condition detection device is set to T3, where T3 is much smaller than T2. ​​The 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 changes in the tire pressure sampling value. If the second set condition is met, the tire condition detection device outputs a tire blowout alarm flag.

[0038] 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 blowout monitoring state, shortening the transmission cycle, thereby meeting the requirements for blowout response time under low energy consumption conditions.

[0039] Preferably, the first setting condition is: the difference between the tire pressure sampling value P_Cur in the current sampling cycle and the tire pressure sampling value P_Tx sent in the previous sending cycle is less than or equal to the first threshold a. If the first setting condition is met, it indicates that the tire pressure has dropped significantly, and the tire condition detection device enters the tire blowout monitoring state. More preferably, -30kPa ≤ first threshold a ≤ -7kPa. The first threshold a is mainly used to determine whether there is a change in tire pressure. When there is a change, the tire condition detection device enters the tire blowout monitoring state and increases the transmission frequency (transmission cycle), which can send the tire pressure value to the vehicle in real time. The value of the first threshold a is affected by the air pressure sampling accuracy, tire pressure changes during normal driving, etc. For the tire blowout monitoring requirements, based on the physical characteristics of air pressure changes during a blowout, the first threshold a is set to a negative value. If it is set too large (absolute value), it will be difficult to enter the tire blowout monitoring state; if it is set too small, it will lead to frequent entry into the tire blowout monitoring state, seriously consuming power and affecting the entire product life.

[0040] Figure 3 This diagram illustrates tire pressure sampling data with a sampling period T1 of 50ms. As shown, a tire fitted with a 19-inch rim, inflated to 260kPa, is driven normally. The detected tire pressure value is measured using a 50ms sampling period. The horizontal axis represents sampling time, and the vertical axis represents tire pressure. According to the curve, the detected tire pressure value fluctuates, but within a reasonable range. Setting the first threshold 'a' needs to account for this fluctuation to avoid frequent triggering. The total time of tire pressure change after a tire blowout is related to the blowout orifice diameter and tire pressure. With a 155R12C tire inflated to 220kPa, the blowout duration is approximately 1.6s when the orifice diameter is 10mm; approximately 0.6s when the orifice diameter is 15mm; approximately 0.3s when the orifice diameter is 20mm; and approximately 0.16s when the orifice diameter is 25mm.

[0041] The theoretical model for tire pressure changes is as follows: △P=△ =

[0042] in This represents the change in gas volume inside the tire. =8.31441 J / (mol) K) is the thermodynamic constant of air; T is the thermodynamic temperature of the gas. The cross-sectional area of ​​the tire for airflow. The gas flow velocity; Where is the gas density; M = 0.029 kg / mol, and is the molar mass of air; Δt represents the volume of gas in the tire body; Δt represents the change over time.

[0043] Once the tires and environment are determined, ΔP / Δt only relates to... , A positive correlation exists: the larger the leakage orifice diameter, the shorter the total leakage time and the greater the pressure drop per unit time. Pressure change curves for different cross-sectional diameters show that the pressure drop rate is greatest at the moment of tire blowout, and the leakage rate gradually decreases as the total pressure decreases. Based on the pressure change curves during tire blowout and pressure sampling fluctuations, a range of -30kPa ≤ first threshold a ≤ -7kPa was set to ensure the effectiveness and timeliness of the response to tire blowouts.

[0044] Preferably, the second condition includes: Condition 1: The difference between the current tire pressure sample value collected in m1 consecutive sampling cycles and the tire pressure sample value of the previous sampling cycle is less than or equal to the second threshold b. If condition 1 is met, then the second set condition is considered to be met, and the tire condition detection device outputs a tire blowout alarm flag.

[0045] The second threshold b and parameter m1 are set as condition 1 for determining that a tire blowout has occurred. After entering the blowout monitoring state, the sampling period is T1 and the transmission period is T3. At this time, the current sampled value P_Cur and the sampled value P_Former of the previous sampling period are the air pressure sampling values ​​before and after sampling period T1. The second threshold b represents the tire air pressure drop value within time T1, which is a negative value. m1 is the number of times P_Cur-P_Former≤b is satisfied. m1 takes the value of a positive integer. If m1 is 2, it means that P_Cur-P_Former≤b is satisfied twice consecutively.

[0046] Figure 4A This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 1 . Figure 4B This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 2 . Figure 4C This diagram illustrates the tire pressure change over a sampling period T1 of 50ms after a tire blowout. Figure 3 . Figure 4D The diagram below shows the tire pressure change after a tire blowout with a sampling period T1 of 50ms. Figures 4A to 4D The results of four tests were recorded. An actual tire blowout test was conducted when the tire was inflated to 270 kPa, with a sampling period T1 of 50 ms. The pressure change curves before and after the blowout were recorded. In the graph, the horizontal axis represents the number of tests, and the vertical axis represents the tire pressure change value (P_Cur - P_Former) for each test. It can be seen that the initial pressure change rate is relatively large during the first few blowouts, then gradually slows down.

[0047] Here, it is also necessary to consider the pressure changes of the tires in a short period of time when they pass over potholes or are subjected to impacts. Figure 5AThis diagram illustrates the change in tire pressure over a sampling period T1 of 50ms on a bumpy road surface. Figure 1 . Figure 5B This diagram illustrates the change in tire pressure over a sampling period T1 of 50ms on a bumpy road surface. Figure 2 . Figure 5A and 5B The results of two tests were recorded, with the horizontal axis representing the number of tests and the vertical axis representing the tire pressure change per test. As shown in the figure, when a tire travels over potholes or experiences an impact, the pressure will initially rise and then fall due to the short-term stress. This impact time is generally quite brief. Based on the sampling data, with a sampling period of 50ms, the change value typically follows a pattern of first being positive (increase), then negative (decrease), and then remaining stable, rarely exhibiting a continuous downward trend. We can use the requirement of a continuous decrease to avoid the problem of abnormal tire pressure changes caused by traveling over potholes or experiencing impacts.

[0048] Taking into account both tire blowout and tire pressure changes caused by driving over potholes, a second threshold b and parameter m1 are set as condition 1 for determining whether a blowout has occurred. A large value for m1 will affect the output time of the blowout status. Therefore, the second threshold b is set to ≤ -7 kPa, and m1 is a natural number ≤ 4. Preferably, the second threshold b = -7 kPa and m1 is 2.

[0049] Preferably, the second condition also includes: Condition 2: The difference between the tire pressure sampling value P_Cur collected in the current sampling cycle and the tire pressure sampling value P_Tx0 sent in the last transmission cycle T2 before the tire condition detection device enters the blowout monitoring state is less than or equal to the third threshold c. If condition 1 is met, then it is determined whether condition 2 is met. If both conditions 2 and condition 2 are met, then it is considered to meet the second set condition.

[0050] To ensure the reliability of the tire blowout warning signal output, condition 2 is set. In addition to satisfying condition 1, it is also necessary to satisfy P_Cur - P_Tx0 ≤ third threshold c. That is, in tire blowout monitoring mode, condition 2 corresponding to the tire pressure change must be met before the tire warning signal is output. More preferably, the third threshold c ≤ -40 kPa.

[0051] Optionally, if condition 1 is met, then it is determined whether condition 2 is met; if condition 2 is not met, then wait for m2 sampling periods T1. If condition 2 can be satisfied within m2 sampling periods T1, then it is considered to meet the second set condition.

[0052] Due to certain special circumstances, the rate of tire pressure decrease is relatively slow. To avoid missed alarms, a sampling period wait is set, with a wait time of m2 sampling periods T1. That is, for cases that meet condition 1 but not condition 2, P_Cur is updated with the next sampled tire pressure value, and then it is determined that P_Cur - P_Tx0 ≤ the third threshold c. Within the m2 waiting periods, if both condition 1 and condition 2 are met simultaneously, a tire alarm flag is output; otherwise, the process returns to the condition 1 check. Preferably, the third threshold c ≤ -40 kPa, and m2 is a natural number ≤ 4. Preferably, the third threshold c = -40 kPa, and m2 is 2. It should be noted that when the tire pressure change is determined to meet the alarm output condition, the alarm flag is output immediately without waiting for the next transmission cycle.

[0053] As is easily understood, the tire condition detection device can be set to exit the blowout monitoring state. For example, if the first threshold 'a' and the second threshold 'b' are not met, the device can exit the blowout monitoring state after n data samplings, and the tire condition detection device will enter the operating state, changing the transmission cycle from T3 to T2 to reduce power consumption. 'n' is a preset value, an integer, and its duration can be set to an integer multiple of the sampling cycle T1, such as 2 seconds.

[0054] Theoretically, the tire condition detection device sets the tire pressure sampling period T1 to 50ms while the vehicle is in motion, with t0 as the first sampling time, observing event changes starting from t0. Assuming a tire blowout occurs between t0 and t1, an abnormal change in tire pressure is confirmed at t1, and condition 1 is confirmed at t2 and t3; condition 2 is confirmed at t3. When the set conditions are met, the total blowout reaction time is calculated as follows: S1: The time from the occurrence of a tire blowout to the tire condition detection device issuing a blowout alarm is <150ms (t0~t3). S2: The wireless signal transmission time of the tire condition detection device is relatively short because the signal receiving processor is located on the side of the vehicle body. The transmission distance is generally less than 5 meters throughout the vehicle. The time from the tire condition detection device to the signal receiving processor can be ignored.

[0055] S3: Signal receiving processor processing time. This time is determined by the transmit baud rate and MCU processing, and the total time is generally <20ms.

[0056] Theoretical calculations show that the total time from the occurrence of a tire blowout to the output of the blowout status by the signal receiver processor is within 170ms. If condition 2 is considered, which requires the passage of times t4 and t5, it will add 100ms. The blowout status can then be output within 270ms, thus meeting the design requirement of a 300ms blowout response time.

[0057] Real-vehicle testing involved driving at speeds exceeding 60 km / h past a tire blowout testing device to induce a tire blowout. The timing of the blowout was determined by monitoring the vehicle's ABS vibration as a reference, and the reaction time was calculated upon receiving a blowout status signal. Using the tire condition monitoring method of this invention, the blowout reaction time met expectations, satisfying the overall requirement of outputting the blowout status within 300ms.

[0058] Figure 6 A schematic diagram of a tire condition detection device according to an embodiment of the present invention is shown. As shown, the present invention also provides a tire condition detection device 600 for implementing the aforementioned tire condition monitoring method. The tire condition detection device 600 includes: The sampling module 601 is used to collect tire pressure based on a sampling period T1 to obtain tire pressure sample values. The sampling module can be a pressure monitoring sensor.

[0059] The transmitting module 602 is used to transmit the collected tire pressure sample value based on the transmitting period T2, or to transmit the collected tire pressure sample value based on the transmitting period T3, or to send a tire blowout alarm flag bit to the signal receiving processor. Comparison module 603 is used to compare changes in tire pressure sampling values; The first judgment module 604 is used to determine whether the first set condition is met based on the comparison result of the comparison module 603. The second judgment module 605 is used to determine whether the second set condition is met based on the comparison result of the comparison module 603.

[0060] The specific implementation and technical effects of the tire condition detection device 600 can be found in the embodiments of the tire condition monitoring method provided by the present invention, and will not be repeated here.

[0061] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A tire condition monitoring method, applicable to a tire condition detection device, wherein the tire condition detection device rapidly acquires tire pressure in a low-power mode and is used to periodically detect tire condition and transmit the detection data externally, the tire condition monitoring method comprising the steps of: In operation, the sampling period of the tire condition detection device is set to T1 and the transmission period is set to T2. The tire condition detection device determines whether the first set condition is met based on the change in the tire pressure sampling value. 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 sampling period T1 is kept constant, and the transmission period of the tire condition detection device is set to T3, where T3 < T2. The tire condition detection device determines whether the second set condition is met based on the change in the tire pressure sampling value. If the second set condition is met, the tire condition detection device outputs a tire blowout alarm flag. The sampling period T1 is set to 20ms to 100ms, and the transmission period T3 is set to 50ms to 150ms. The first set condition is: The difference between the tire pressure sample value in the current sampling period and the tire pressure sample value sent in the previous sending period is less than or equal to a first threshold a, where the first threshold a is a negative value.

2. The tire condition monitoring method as described in claim 1, characterized in that, -30kPa≤First threshold a≤-7kPa.

3. The tire condition monitoring method as described in claim 1, characterized in that, The second set of conditions includes: Condition 1: The difference between the current tire pressure sample value collected in m1 consecutive sampling cycles and the tire pressure sample value of the previous sampling cycle is less than or equal to the second threshold b. If condition 1 is met, then the second condition is considered to be met.

4. The tire condition monitoring method as described in claim 3, characterized in that, The second threshold is b≤-7kPa, and m1 is a natural number and m1≤4.

5. The tire condition monitoring method as described in claim 3, characterized in that, The second setting condition also includes: Condition 2: The difference between the tire pressure sample value collected in the current sampling cycle and the tire pressure sample value sent in the last transmission cycle T2 before the tire condition detection device enters the blowout monitoring state is less than or equal to the third threshold c. If condition 1 is met, then it is determined whether condition 2 is met. If both conditions 2 and condition 2 are met, then it is considered to meet the second set condition.

6. The tire condition monitoring method as described in claim 5, characterized in that, The third threshold is c ≤ -40 kPa.

7. The tire condition monitoring method as described in claim 5, characterized in that, If condition 1 is met, then determine whether condition 2 is met. If condition 2 is not met, then wait for m2 sampling periods T1. If condition 2 is met within m2 sampling periods, then the second set condition is considered to be met.

8. The tire condition monitoring method as described in claim 7, characterized in that, The third threshold is c≤-40kPa, where m2 is a natural number and m2≤4.

9. A tire condition detection device for implementing the tire condition monitoring method of claim 1, characterized in that, The tire condition detection device includes: The sampling module collects tire pressure based on the sampling period T1 to obtain the tire pressure sampling value; The sending module sends the tire pressure sampling value based on the sending period T2, sends the tire pressure sampling value based on the sending period T3, or sends the tire blowout alarm flag bit; The comparison module is used to compare changes in tire pressure sampling values; The first judgment module determines whether the first set condition is met based on the comparison result of the comparison module; The second judgment module determines whether the second set condition is met based on the comparison result of the comparison module.

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