Method, system, device, storage medium and vehicle for determining whether a tire is deflated

Abstract

The present application belongs to the field of vehicles, and discloses a method, system, device, storage medium and vehicle for judging whether a tire is deflated. The present application solves the jitter problem by periodically collecting tire pressure, selecting the median value of the tire pressure display data of each collection period as a standard tire gas tire pressure representative, then excluding the interference caused by the pressure generated by the body load through cross operation on each calculation period, and then according to the charlie law, operating on each calculation period to obtain the result, and comparing whether the difference between the standard tire pressure and the average tire pressure exceeds the preset threshold to achieve the purpose of judging whether the tire is deflated. The present application can judge the slow deflation of the tire in advance through calculation, improve the accuracy of judging whether the tire is deflated, and improve the driving safety.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more specifically to a method, system, device, storage medium, and vehicle for determining whether a tire is leaking air. Background Technology

[0002] Tire pressure is one of the most important safety monitoring data points during vehicle operation. Tire pressure fluctuates continuously with changes in light, temperature, and external forces during high-speed driving, making it inaccurate to judge solely based on whether the real-time tire pressure is within the normal range. For example, during high-speed driving, a tire pressure might increase from 220 kPa to 230 kPa, but according to calculations, its actual pressure should have increased to 235 kPa. This indicates a minor leak, but traditional tire pressure monitoring systems (TPMS) will not trigger the warning, posing a safety hazard. Summary of the Invention

[0003] Therefore, to address the aforementioned shortcomings, this invention provides a method, system, device, storage medium, and vehicle for determining whether a tire is leaking air. Specifically, it relates to a solution suitable for detecting slow tire leaks at high speeds by monitoring tire pressure changes. This solution calculates and anticipates slow leaks during tire pressure changes, and then issues a warning.

[0004] The first aspect of this application provides a method for determining whether a tire is leaking air, including: The tire pressure display value and the corresponding tire internal temperature value are collected in each calculation cycle to obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N collection cycles, and the collection frequency in each collection cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. Take the median of each group of tire pressure display data to obtain N tire pressure display median values. Calculate the above N tire pressure display median values ​​using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculation values, 1≤i≤N, where i represents the i-th collection cycle. The most stable set of data is selected from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and the average value of the actual tire pressure data of the judgment standard set is calculated as the average tire pressure for each calculation cycle; the temperature value corresponding to the median value of the tire pressure display of the judgment standard set is obtained, and the standard tire pressure for each calculation cycle is calculated using this temperature value and Charles's Law formula. Calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air.

[0005] Optionally, in one embodiment of this application, obtaining N median values ​​of tire pressure display data by taking the median of each group of tire pressure display data includes the following operation: sorting the N groups of tire pressure display data in ascending order of value within each group, and taking the value located in the middle of each group as the median value of the tire pressure display for that group.

[0006] Optionally, in one embodiment of this application, the actual tire pressure value is calculated as follows: Formula 1 The actual tire pressure values ​​at times Ta and Tb can be calculated using Formula 1. The calculation process is as follows: Formula 2 Formula 3 Where P0 is the tire pressure of the tire gas at 0℃, t is the temperature of the gas inside the tire, P (gas) is the actual tire pressure, P (load) is the tire pressure of the load-bearing part of the tire, Pa (gas) and Pb (gas) are the actual tire pressures at times Ta and Tb, respectively, and t1 and t2 represent the temperatures of the gas inside the tire at times Ta and Tb, respectively. By substituting the median values ​​of N tire pressure readings into Formula 2 and Formula 3 respectively and performing pairwise cross-calculation, N sets of actual tire pressure data can be obtained. Each set of actual tire pressure data includes N-1 actual tire pressure calculation values.

[0007] Optionally, in one embodiment of this application, the method for selecting the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle is as follows: The mean squared error is calculated for each set of actual tire pressure data, and the set with the smallest variance is the most stable set of data. The formula for calculating the mean square error is:

[0008] Where: x n This represents the nth element.

[0009] Optionally, in one embodiment of this application, it further includes: issuing a warning when it is determined that there is a tire leak.

[0010] A second aspect of this application provides a system for determining whether a tire is leaking air, comprising: The data acquisition module is used to collect the tire pressure display value and the corresponding tire internal temperature value in each calculation cycle, and obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N acquisition cycles, and the acquisition frequency in each acquisition cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. The first calculation module is used to take the median of each group of tire pressure display data to obtain N tire pressure display median values. The above N tire pressure display median values ​​are calculated using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculated values, 1≤i≤N, where i represents the i-th acquisition cycle. The second calculation module is used to select the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and calculate the average value of the actual tire pressure data of the judgment standard set as the average tire pressure for each calculation cycle; obtain the temperature value corresponding to the median value of the tire pressure display of the judgment standard set, and calculate the standard tire pressure for each calculation cycle using the temperature value and Charles's Law formula. The judgment module is used to calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air.

[0011] A third aspect of this application provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the methods described above.

[0012] A fourth aspect of this application provides a storage medium including a stored program, wherein the program, when running, controls the device where the storage medium is located to execute any of the methods described above.

[0013] A fifth aspect of this application describes a vehicle including a memory and a processor. The memory stores information including program instructions, and the processor controls the execution of the program instructions, which, when loaded and executed by the processor, implement the steps of any of the methods described above.

[0014] The present invention has the following advantages: This application addresses the vibration problem by periodically collecting tire pressure data and selecting the median value of the tire pressure display data in each collection cycle as a standard tire pressure representative. Then, it eliminates interference caused by the pressure generated by the vehicle's load through cross-calculation in each calculation cycle. Finally, it calculates the results for each subsequent calculation cycle according to Charles's Law. By comparing the difference between the standard tire pressure and the average tire pressure to see if it exceeds a preset threshold, it determines whether there is a leak.

[0015] This application uses calculations to predict slow tire leaks in advance, improving the accuracy of tire leak detection and enhancing driving safety. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the method for determining whether a tire is leaking air, as provided in an embodiment of this application. Figure 2 This is a schematic diagram of the system structure for determining whether a tire is leaking air, provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of the terminal device provided in the embodiments of this application; Figure 4 This is a schematic diagram of the vehicle structure provided in the embodiments of this application. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0020] It should be noted that, according to Charles's Law, for a given mass of gas with a constant volume, its pressure is directly proportional to its thermodynamic temperature. That is, P = P0(1+βt), where P0 is the pressure at 0℃, t is the temperature in Celsius, and β is the coefficient of gas expansion. β is independent of the type of gas and the temperature range, and β = 1 / 273. Therefore, P = P0(1+t / 273), where P is the gas pressure when the temperature rises to t℃, P0 is the gas pressure at 0℃, and t is the increase in gas temperature (℃).

[0021] As can be seen from the above, under normal circumstances, if the total amount of gas in the tire remains constant, the tire pressure data will be positively correlated with the temperature of the gas inside the tire. Tire pressure P1 and temperature t1 can be collected at time point 1, and tire pressure P2 and temperature t2 can be collected at time point 2. Then, according to Charles's Law, P1 = P0(1+t1 / 273), P2 = P0(1+t2 / 273), that is, P1 / P2 = (273+t1) / (273+t2). If this condition is not met, it indicates that the total amount of gas has changed, meaning the tire is leaking air.

[0022] However, in actual driving, tire pressure is generated by the gas inside the tire and the weight on the vehicle body, which can be expressed as P(displayed) = P(gas) + P(weight). Here, P(displayed) is the tire pressure directly monitored and displayed; P(gas) is the pressure generated by the gas inside the tire, i.e., the inflated tire pressure, or actual tire pressure; and P(weight) is the pressure generated by the weight on the vehicle body. Therefore, the tire pressure monitoring data seen by the user is not solely due to the gas inside the tire. Thus, the formula P(displayed) = P0(1+t / 273) cannot be directly applied. Instead, the pressure increase due to the weight must be subtracted: P(gas) = ​​P(displayed) - P(weight) = P0(1+t / 273). Even at high speeds, P(weight) will slightly change due to occasional uphill or downhill inclines.

[0023] In addition, during vehicle operation, encountering subsidence areas or momentarily running over hard objects like stones can cause instantaneous tire pressure fluctuations. The tire pressure monitoring data at the moment of these fluctuations is generated by three components, which can be represented as P(displayed) = P(gas pressure) + P(load) + P(external force). When the vehicle is subsided, the downward acceleration due to gravity causes a momentary increase in tire pressure, resulting in a positive P(external force). Conversely, when the vehicle is rising, the upward acceleration due to the rebound causes a momentary decrease in tire pressure, resulting in a negative P(external force). Running over a hard object causes a momentary increase in tire pressure followed by a return to normal.

[0024] Based on the above, this application provides a method, system, device, storage medium, and vehicle for determining whether a tire is leaking air. The embodiments of this application can predict slow tire leaks in advance through calculation during tire pressure changes, improving the accuracy of tire leak detection and enhancing driving safety.

[0025] The following description, with reference to the accompanying drawings, describes a method, system, device, storage medium, and vehicle for determining whether a tire is leaking air, according to embodiments of this application.

[0026] The first aspect of this application provides a method for determining whether a tire is leaking air. Figure 1 This is a flowchart illustrating the method for determining whether a tire is leaking air, as provided in an embodiment of this application.

[0027] like Figure 1 As shown, the method for determining whether a tire is leaking air includes the following steps: Step S101: Collect the tire pressure display value and the tire internal temperature value at the corresponding time in each calculation cycle to obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N collection cycles, and the collection frequency in each collection cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1.

[0028] The tire pressure display data is represented by P (display), and the tire internal temperature value is represented by t.

[0029] Understandably, the acquisition period, acquisition frequency, and calculation period can be set according to actual conditions. For example, the acquisition frequency within each acquisition period is 1 acquisition per second, each acquisition period is 10 seconds, and each calculation period is 60 seconds.

[0030] Step S102: Take the median of each group of tire pressure display data to obtain N tire pressure display median values. Calculate the above N tire pressure display median values ​​using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculation values, 1≤i≤N, where i represents the i-th acquisition cycle.

[0031] In a preferred embodiment, obtaining N median tire pressure display values ​​by taking the median of each group of tire pressure display data includes the following operation: sorting the N groups of tire pressure display data in ascending order within each group, and taking the value located in the middle of each group as the median tire pressure display value for that group. For example, if a group of tire pressure display data is sorted in ascending order as 201, 201, 202, 203, 205, the median tire pressure display value for this group is 202.

[0032] In a preferred embodiment, after determining the median value of the tire pressure display for each group, a total of N median tire pressure display values ​​are obtained. Based on these N median tire pressure display values, N sets of actual tire pressure data are calculated. The specific calculation process is as follows: Based on Charles's Law, we can deduce and calculate: Formula 1 The actual tire pressure values ​​at times Ta and Tb can be calculated using Formula 1. The calculation process is as follows: Formula 2 Formula 3 Where P0 is the tire pressure of the tire gas at 0℃, t is the temperature of the gas inside the tire, P (gas) is the actual tire pressure, P (load) is the tire pressure of the load-bearing part of the tire, Pa (gas) and Pb (gas) are the actual tire pressures at times Ta and Tb, respectively, and t1 and t2 represent the temperatures of the gas inside the tire at times Ta and Tb, respectively. By substituting the median values ​​of N tire pressure readings into Formula 2 and Formula 3 respectively and performing pairwise cross-calculation, N sets of actual tire pressure data can be obtained. Each set of actual tire pressure data includes N-1 actual tire pressure calculation values.

[0033] Taking "the sampling frequency within each sampling cycle is 1 second / sampling, each sampling cycle is 10 seconds, and each calculation cycle is 60 seconds" as an example, the actual tire pressure data calculation process can be as follows: Based on P1(gas) + P(load) = P1(display) and P2(gas) + P(load) = P2(display), we can obtain: P1(gas) = ​​P1(display) - P2(display) + P2(gas). According to Charles's Law, P = P0(1 + t / 273), that is, P1(gas) = ​​P0(1 + t1 / 273) and P2(gas) = ​​P0(1 + t2 / 273), we can obtain: P1(gas) = ​​(273 + t1) / (273 + t2) * P2(gas). Since P1(display), P2(display), t1, and t2 can all be directly read from the monitoring data, P1(gas) and P2(gas) can be calculated.

[0034] Since the load-bearing capacity (P) may vary slightly due to occasional uphill or downhill slopes in actual calculations, pairwise cross-calculation is performed on the six data points P1 (display), P2 (display), P3 (display), P4 (display), P5 (display), and P6 (display) generated after median filtering within each calculation cycle (60 seconds). The specific calculation method is described above, and the detailed calculation process for pairwise cross-calculation is as follows: P1 (display) and P2 (display) are used to calculate P1 (gas) and P2 (gas); P1 (display) and P3 (display) are used to calculate P1 (gas) and P3 (gas); P1 (display) and P4 (display) are used to calculate P1 (gas) and P4 (gas); P1 (display) and P5 (display) are used to calculate P1 (gas) and P5 (gas); P1 (display) and P6 (display) are used to calculate P1 (gas) and P6 (gas); P2 (display) and P3 (display) are used to calculate P2 (gas) and P3 (gas); ……… Following this pattern, after completing 30 sets of calculations, each tire pressure reading will yield 5 data points (all in kPa) depending on the pair of calculation objects. The 5 different P1 (gas) values ​​are: 210, 211, 209, 210, 211; the 5 different P2 (gas) values ​​are: 210, 210, 209, 210, 211; the 5 different P3 (gas) values ​​are: 210, 210, 210, 210, 211; the 5 different P4 (gas) values ​​are: 210, 210, 211, 210, 211; the 5 different P5 (gas) values ​​are: 210, 210, 210, 209, 211; and the 5 different P6 (gas) values ​​are: 211, 211, 211, 211, 211. A total of 6 sets of actual tire pressure data were obtained.

[0035] Step S103: Select the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and calculate the average value of the actual tire pressure data of the judgment standard set as the average tire pressure for each calculation cycle; obtain the temperature value corresponding to the median value of the tire pressure display of the judgment standard set, and calculate the standard tire pressure for each calculation cycle using the temperature value and Charles's Law formula.

[0036] In a preferred embodiment, the method for selecting the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle is as follows: The mean squared error is calculated for each set of actual tire pressure data, and the set with the smallest variance is the most stable set of data. The formula for calculating the mean square error is:

[0037] Where: x n This represents the nth element.

[0038] Taking the above example of "the sampling frequency within each sampling cycle is 1 second / time, each sampling cycle is 10 seconds, and each calculation cycle is 60 seconds", the most stable set of data is selected from the 6 sets of actual tire pressure data obtained from the calculation. That is, the set of data with the smallest calculation error and interference from other factors is selected as the judgment standard set within the calculation cycle. After calculation, the above P6 (gas) group has the smallest variance, that is, the smallest fluctuation and the most stable. This group is selected as the judgment standard set, and the average value of this group is calculated as 211 as the average tire pressure within the calculation cycle. The temperature value corresponding to the median value of the tire pressure display is obtained. According to the Charles formula P = P0(1+t / 273), the standard tire pressure at the median value is calculated. The pressure P0 of the tire at 0℃ is a fixed value.

[0039] Step S104: Calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air.

[0040] For example, if the preset threshold is 1 kPa, during continuous driving, the standard tire pressure P (standard) is calculated to be 231.00 kPa at a certain temperature, but the actual average tire pressure is only 229.50 kPa. At this time, the difference exceeds 1 kPa, indicating that the gas volume has decreased, and it is determined that there is a leak in the tire.

[0041] In a preferred embodiment, when a tire leak is detected, a voice prompt is given. For example, the driver can be reminded, and the reminder can be given by voice, such as "Please check for tire leaks", or by a text prompt that pops up on the screen, or by other warning sounds or warning lights.

[0042] In summary, the method for determining whether a tire is leaking air provided in this application solves the vibration problem by periodically collecting tire pressure data and selecting the median value of the tire pressure display data in each collection cycle as a standard tire pressure representative. Then, it eliminates the interference caused by P (load) by performing cross-calculation on each calculation cycle, and then calculates the result for each subsequent calculation cycle according to Charles's Law. The purpose of determining whether there is a leak is achieved by comparing whether the difference between the standard tire pressure and the average tire pressure exceeds a preset threshold.

[0043] A second aspect of this application provides a system for determining whether a tire is leaking air. Figure 2 This is a schematic diagram of the system structure for determining tire leaks provided in an embodiment of this application.

[0044] like Figure 2 As shown, the system 20 for determining whether a tire is leaking air includes a data acquisition module 201, a first calculation module 202, a second calculation module 203, and a judgment module 204. The specific functions of each module are as follows: The data acquisition module 201 is used to acquire the tire pressure display value and the corresponding tire internal temperature value in each calculation cycle, and obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N acquisition cycles, and the acquisition frequency in each acquisition cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. The first calculation module 202 is used to take the median of each group of tire pressure display data to obtain N tire pressure display median values. The above N tire pressure display median values ​​are calculated using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculated values, 1≤i≤N, where i represents the i-th acquisition cycle. The second calculation module 203 is used to select the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and calculate the average value of the actual tire pressure data of the judgment standard set as the average tire pressure for each calculation cycle; obtain the temperature value corresponding to the median value of the tire pressure display of the judgment standard set, and calculate the standard tire pressure for each calculation cycle using the temperature value and Charles's Law formula. The judgment module 204 is used to calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that there is a leak in the tire.

[0045] In a preferred embodiment, the system for determining whether a tire is leaking air may further include a voice module for providing a voice prompt when a tire leak is detected. It may also include a display module for displaying relevant text or indicator lights when a tire leak is detected.

[0046] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. In the embodiments, each functional unit or module can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of each functional unit and module are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0047] Figure 3 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. Figure 3 As shown, the terminal device 3 in this embodiment includes: at least one processor 30 ( Figure 3 (Only one is shown in the diagram) a processor, a memory 31, and a computer program 32 stored in the memory 31 and executable on the at least one processor 30, wherein the processor 30 executes the computer program 32 to implement the steps in any of the above embodiments of the vehicle radio performance testing method.

[0048] The terminal device 3 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud terminal device. This terminal device may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 3This is merely an example of terminal device 3 and does not constitute a limitation on terminal device 3. It may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, it may also include input / output devices, network access devices, etc.

[0049] The processor 30 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0050] In some embodiments, the memory 31 may be an internal storage unit of the terminal device 3, such as a hard disk or memory of the terminal device 3. In other embodiments, the memory 31 may be an external storage device of the terminal device 3, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the terminal device 3. Furthermore, the memory 31 may include both internal storage units and external storage devices of the terminal device 3. The memory 31 is used to store the operating system, applications, boot loader, data, and other programs, such as the program code of the computer program. The memory 31 may also be used to temporarily store data that has been output or will be output.

[0051] For example, the computer program 32 can be divided into one or more units, which are stored in the memory 31 and executed by the processor 30 to complete this application. The one or more units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program 32 in the terminal device 3. For example, the computer program 32 can be divided into a data acquisition module 201, a first calculation module 202, a second calculation module 203, and a judgment module 204, with the specific functions of each module as follows: The data acquisition module is used to collect the tire pressure display value and the corresponding tire internal temperature value in each calculation cycle, and obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N acquisition cycles, and the acquisition frequency in each acquisition cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. The first calculation module is used to take the median of each group of tire pressure display data to obtain N tire pressure display median values. The above N tire pressure display median values ​​are calculated using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculated values, 1≤i≤N, where i represents the i-th acquisition cycle. The second calculation module is used to select the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and calculate the average value of the actual tire pressure data of the judgment standard set as the average tire pressure for each calculation cycle; obtain the temperature value corresponding to the median value of the tire pressure display of the judgment standard set, and calculate the standard tire pressure for each calculation cycle using the temperature value and Charles's Law formula. The judgment module is used to calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air.

[0052] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various method embodiments above.

[0053] Figure 4 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application. Figure 4 As shown, this application embodiment provides a vehicle 4, including a memory 41 and a processor 40. The memory 40 is used to store the execution of program instructions 42. When the program instructions 42 are loaded and executed by the processor, they implement the steps in the above-described method embodiments.

[0054] This application also provides a computer program product that, when run on a mobile terminal, enables the mobile terminal to implement the steps described in the above-described method embodiments.

[0055] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying the computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0057] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0058] In the embodiments provided in this application, it should be understood that the disclosed apparatus / network devices and methods can be implemented in other ways. For example, the apparatus / network device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0059] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for determining whether a tire is leaking air, characterized in that, include: The tire pressure display value and the corresponding tire internal temperature value are collected in each calculation cycle to obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N collection cycles, and the collection frequency in each collection cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. Take the median of each group of tire pressure display data to obtain N tire pressure display median values. Calculate the above N tire pressure display median values ​​using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculation values, 1≤i≤N, where i represents the i-th collection cycle. The most stable set of data is selected from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and the average value of the actual tire pressure data of the judgment standard set is calculated as the average tire pressure for each calculation cycle; the temperature value corresponding to the median value of the tire pressure display of the judgment standard set is obtained, and the standard tire pressure for each calculation cycle is calculated using this temperature value and Charles's Law formula. Calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air. The calculation process for the actual tire pressure data is as follows: Official 1, The actual tire pressure values ​​at times Ta and Tb are calculated using Formula 1. The calculation process is as follows: Official 2, Official 3, Where P0 is the tire pressure at 0℃, t is the temperature of the gas inside the tire, the actual tire pressure of a vehicle during driving is generated by the gas inside the tire and the weight on the vehicle body, P (display) is the tire pressure directly monitored and displayed, P (gas) is the pressure generated by the gas inside the tire, i.e. the actual tire pressure, P (weight) is the tire pressure of the load-bearing part of the tire, Pa (gas) and Pb (gas) are the actual tire pressures at times Ta and Tb, respectively, and t1 and t2 represent the temperatures of the gas inside the tire at times Ta and Tb, respectively. By substituting the median values ​​of N tire pressure readings into Formula 2 and Formula 3 respectively and performing pairwise cross-calculation, N sets of actual tire pressure data can be obtained. Each set of actual tire pressure data includes N-1 actual tire pressure calculation values.

2. The method for determining whether a tire is leaking air according to claim 1, characterized in that, The step of obtaining the median of each group of tire pressure display data to obtain N median tire pressure display values ​​includes the following operations: sorting the N groups of tire pressure display data in ascending order within each group, and taking the value located in the middle of each group as the median tire pressure display value of that group.

3. The method for determining whether a tire is leaking air according to claim 1, characterized in that, The method for selecting the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle is as follows: For each set of actual tire pressure data, the standard deviation is calculated, and the set with the smallest standard deviation is the most stable set of data; the formula for calculating the standard deviation is: ， in: xn This represents the nth element.

4. A method for determining whether a tire is leaking air according to any one of claims 1-3, characterized in that, Also includes: It will alert you when a tire leak is detected.

5. A system for determining whether a tire is leaking air, characterized in that, include: The data acquisition module is used to collect the tire pressure display value and the corresponding tire internal temperature value in each calculation cycle, and obtain N sets of tire pressure display data and tire internal temperature data. Each calculation cycle includes N acquisition cycles, and the acquisition frequency in each acquisition cycle is M seconds / time; N is a positive integer ≥3, and M is a positive integer ≥1. The first calculation module is used to take the median of each group of tire pressure display data to obtain N tire pressure display median values. The above N tire pressure display median values ​​are then calculated using the Charles's Law formula and cross-operation method to obtain N groups of actual tire pressure data. Each group of actual tire pressure data includes N-1 actual tire pressure calculated values, 1≤i≤N, where i represents the i-th acquisition cycle. The second calculation module is used to select the most stable set of data from N sets of actual tire pressure data as the judgment standard set for each calculation cycle, and calculate the average value of the actual tire pressure data of the judgment standard set as the average tire pressure for each calculation cycle; obtain the temperature value corresponding to the median value of the tire pressure display of the judgment standard set, and calculate the standard tire pressure for each calculation cycle using the temperature value and Charles's Law formula. The judgment module is used to calculate the difference between the standard tire pressure and the average tire pressure in the current calculation cycle. If the difference exceeds a preset threshold, it is determined that the tire is leaking air. The calculation process for the actual tire pressure data is as follows: Official 1, The actual tire pressure values ​​at times Ta and Tb are calculated using Formula 1. The calculation process is as follows: Official 2, Official 3, Where P0 is the tire pressure at 0℃, t is the temperature of the gas inside the tire, the actual tire pressure of a vehicle during driving is generated by the gas inside the tire and the weight on the vehicle body, P (display) is the tire pressure directly monitored and displayed, P (gas) is the pressure generated by the gas inside the tire, i.e. the actual tire pressure, P (weight) is the tire pressure of the load-bearing part of the tire, Pa (gas) and Pb (gas) are the actual tire pressures at times Ta and Tb, respectively, and t1 and t2 represent the temperatures of the gas inside the tire at times Ta and Tb, respectively. By substituting the median values ​​of N tire pressure readings into Formula 2 and Formula 3 respectively and performing pairwise cross-calculation, N sets of actual tire pressure data can be obtained. Each set of actual tire pressure data includes N-1 actual tire pressure calculation values.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

7. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the storage medium is located to perform the method according to any one of claims 1 to 4.

8. A vehicle comprising a memory and a processor, the memory for storing information including program instructions, the processor for controlling the execution of the program instructions, characterized in that, When the program instructions are loaded and executed by the processor, they implement the steps of the method according to any one of claims 1 to 4.

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