Tire pressure anomaly detection method and device

Abstract

The invention discloses a tire pressure anomaly detection method and device, which can be applied to the technical field of vehicles, and comprises the following steps: determining the ratio of the environment temperature to the current temperature of each tire; determining an underpressure alarm threshold value corresponding to each tire according to the product of each specific value and a recommended air pressure value of the whole vehicle, determining a tire pressure value corresponding to each tire according to the inflation pressure recommended by a vehicle manufacturer for the vehicle model according to the expected application condition of the given vehicle, and determining an underpressure alarm threshold value corresponding to each tire according to the tire pressure value. And comparing the tire pressure value of each tire with the corresponding under-pressure alarm threshold value, and if the tire pressure value is greater than or equal to the under-pressure alarm threshold value, determining that the tire pressure of the corresponding tire is abnormal. According to the method, the environment temperature and the tire temperature are combined for calculation, the environment temperature is considered, the influence of the external environment temperature on the tire pressure can be reduced, the accuracy of tire pressure anomaly detection can be improved, potential safety hazards are reduced, and the experience feeling of a user is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method and device for detecting abnormal tire pressure. Background Art

[0002] Tires are important components in automobiles. Tire pressure will affect the service life of the tires, and abnormal tire pressure will pose a safety hazard and lead to safety accidents.

[0003] At present, cars are equipped with TPMS systems to monitor and detect tire pressure data and provide abnormal information to drivers in a timely manner. However, in areas with large temperature differences between day and night, tire pressure will change significantly with temperature, and the TPMS system will misjudge, which may bring safety risks on the one hand and reduce the user experience on the other.

[0004] Therefore, how to improve the accuracy of abnormal tire pressure detection, thereby reducing safety hazards and improving user experience is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The present application provides a tire pressure abnormality detection method to improve the accuracy of tire pressure abnormality detection, thereby reducing safety hazards and improving user experience. The present application also provides a tire pressure abnormality detection device.

[0006] In a first aspect, the present application provides a method for detecting abnormal tire pressure, comprising:

[0007] Determining a ratio of the ambient temperature to the current temperature of each tire;

[0008] Determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle;

[0009] Determine a tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with a corresponding under-pressure alarm threshold;

[0010] If the tire pressure value is greater than or equal to the under-pressure warning threshold, it is determined that the tire pressure of the corresponding tire is abnormal.

[0011] Optionally, determining the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the vehicle includes:

[0012] Determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the vehicle;

[0013] The underpressure alarm threshold corresponding to each tire is determined according to each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs.

[0014] Optionally, the ambient temperature is determined by:

[0015] Obtaining a first frame of message data reported by a sensor after the vehicle is powered on, wherein the first frame of message data includes an initial temperature of each tire of the vehicle;

[0016] The lowest initial temperature among the initial temperatures is determined as the ambient temperature.

[0017] Optionally, the operating pressure corresponding to the tire is determined according to the product of the ratio and the recommended air pressure value of the vehicle, and the formula is:

[0018]

[0019] Among them, P rec P is the recommended air pressure value for the vehicle. atm ——Absolute atmospheric pressure, take 100KPa;

[0020] T tire is the current temperature of the tire, the temperature unit is Kelvin = Celsius + 273, T tire-min is the lowest initial temperature among each initial temperature, the temperature unit is Kelvin = Celsius + 273, T warm The operating pressure of the tire.

[0021] Optionally, when it is determined that there is a tire with abnormal tire pressure, the method further includes:

[0022] Abnormal information of a tire with abnormal tire pressure is sent to a display system so that the display system displays and warns according to the abnormal information, wherein the abnormal information at least includes a tire identification and a tire pressure value.

[0023] In a second aspect, the present application further provides a tire pressure abnormality detection device, the device comprising:

[0024] A first determination unit, used to determine a ratio of the ambient temperature to the current temperature of each tire;

[0025] A second determination unit is used to determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle;

[0026] A comparison unit, used to determine the tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with the corresponding under-pressure alarm threshold;

[0027] The third determination unit is used to determine that the tire pressure of the corresponding tire is abnormal if the tire pressure value is greater than or equal to the under-pressure alarm threshold.

[0028] Optionally, the second determining unit is specifically configured to:

[0029] Determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the vehicle;

[0030] The underpressure alarm threshold corresponding to each tire is determined according to each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs.

[0031] Optionally, the first determining unit is specifically configured to:

[0032] Obtaining a first frame of message data reported by a sensor after the vehicle is powered on, wherein the first frame of message data includes an initial temperature of each tire of the vehicle;

[0033] The lowest initial temperature among the initial temperatures is determined as the ambient temperature.

[0034] Optionally, the device further comprises:

[0035] The sending unit is used to send abnormal information of the tire with abnormal tire pressure to the display system, so that the display system displays and warns according to the abnormal information, and the abnormal information at least includes the tire identification and tire pressure value.

[0036] Optionally, the operating pressure corresponding to the tire is determined according to the product of the ratio and the recommended air pressure value of the vehicle, and the formula is:

[0037]

[0038] Among them, P rec P is the recommended air pressure value for the vehicle. atm ——Absolute atmospheric pressure, take 100KPa;

[0039] T tire is the current temperature of the tire, the temperature unit is Kelvin = Celsius + 273, T tire-min is the lowest initial temperature among each initial temperature, the temperature unit is Kelvin = Celsius + 273, T warm The operating pressure of the tire.

[0040] In a third aspect, an embodiment of the present application provides a vehicle controller, including: a processor and a memory;

[0041] Wherein, one or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the vehicle controller executes the method described in the first aspect.

[0042] In a fourth aspect, an embodiment of the present application provides a computer storage medium, in which a code is stored. When the code is executed, a device executing the code implements the method described in the first aspect above.

[0043] In a fifth aspect, an embodiment of the present application provides a vehicle, comprising the device described in the second aspect.

[0044] Compared with the prior art, this application has the following beneficial effects:

[0045] Determine the ratio of the ambient temperature to the current temperature of each tire; determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the vehicle, wherein the recommended air pressure value of the vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model for the expected application conditions of a given vehicle; determine the tire pressure value corresponding to each tire, compare the tire pressure value of each tire with the corresponding underpressure alarm threshold, and if there is a situation where the tire pressure value is greater than or equal to the underpressure alarm threshold, determine that the tire pressure of the corresponding tire is abnormal. In this application, the ambient temperature and the tire temperature are combined for calculation, and the ambient temperature is taken into account, thereby reducing the impact of the external ambient temperature on the tire pressure, thereby improving the accuracy of tire pressure abnormality detection, thereby reducing safety hazards and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A flowchart of a tire pressure abnormality detection method provided in an embodiment of the present application;

[0048] Figure 2 A schematic structural diagram of a specific implementation of the tire pressure abnormality detection device provided in this application. DETAILED DESCRIPTION

[0049] 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] Tires are important components in automobiles. Tire pressure will affect the service life of the tires, and abnormal tire pressure will pose a safety hazard and lead to safety accidents.

[0051] At present, cars are equipped with TPMS systems to monitor and detect tire pressure data and provide abnormal information to drivers in a timely manner. At present, the TPMS sensor in the TPMS system collects tire pressure and tire temperature data, but the TPMS controller in the TPMS system does not process the tire temperature data in any way, and only sends and displays it to the driver. When the tire pressure drops with the temperature, it is easy to trigger the set underpressure alarm line, resulting in false alarms, and then the TPMS system will misjudge, which may bring safety hazards on the one hand, and reduce the user experience on the other.

[0052] In view of this, the present application provides a method for detecting abnormal tire pressure, including: determining the ratio of the ambient temperature to the current temperature of each tire; determining the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model for the expected application conditions of a given vehicle, determining the tire pressure value corresponding to each tire, comparing the tire pressure value of each tire with the corresponding underpressure alarm threshold, and if there is a situation where the tire pressure value is greater than or equal to the underpressure alarm threshold, then determining that the tire pressure of the corresponding tire is abnormal. In the present application, the ambient temperature and the tire temperature are combined for calculation, and the ambient temperature is taken into account, thereby reducing the impact of the external ambient temperature on the tire pressure, thereby improving the accuracy of abnormal tire pressure detection, thereby reducing safety hazards and improving the user experience.

[0053] It should be noted that the tire pressure abnormality detection method and device provided in this application can be used in the field of vehicle technology. The above is only an example and does not limit the application field of the method and device provided in this application.

[0054] The method provided in the embodiment of the present application can be executed by a computing device with computing functions in a vehicle, for example, it can be executed on a TPMS (Tire Pressure Monitoring System) controller of the vehicle, wherein the TPMS controller is installed on the vehicle and is used to analyze and process data such as tire pressure and temperature sent by the TPMS sensor in real time, and send abnormal information to a display system.

[0055] In order to make the technical personnel in this field better understand the present application, the present application is further described in detail below in combination with the drawings and specific implementation methods. The method provided in the present application embodiment is described below by taking the first device as an example.

[0056] Figure 1 A flow chart of a tire pressure abnormality detection method provided in an embodiment of the present application. Figure 1 As shown, the method includes:

[0057] S101: Determine the ratio of the ambient temperature to the current temperature of each tire.

[0058] The first device may determine the ambient temperature and may obtain the current temperature of each tire of the vehicle.

[0059] For example, after the vehicle is powered on, the first device may obtain the first frame of message data reported by the sensor, wherein the first frame of message data may include the initial temperature of each tire of the vehicle. Then, the lowest initial temperature among each initial temperature may be determined as the ambient temperature. The sensor here may be a TPMS sensor, which is installed in the tire and can monitor tire pressure and temperature, etc. and can be sent to the TPMS controller in the form of a wireless signal.

[0060] After determining the ambient temperature, the ratio of the ambient temperature to the current temperature of each tire can be determined. For example, taking a vehicle including four wheels (each wheel corresponding to a tire) as an example, the ratio of the ambient temperature to the current temperature of each of the four tires can be determined.

[0061] S102: Determine the underpressure warning threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the vehicle.

[0062] The first device can determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle.

[0063] Exemplarily, the first device can determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the whole vehicle, and then determine the under-pressure alarm threshold corresponding to each tire based on each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs. For example, in China's JT / T1178.2-2019 standard, the under-pressure alarm threshold is based on 75% of the operating pressure P. The operating pressure refers to the inflation pressure at each tire position after the inflation pressure is increased from the cold tire due to temperature effects during vehicle operation.

[0064] Taking the preset ratio of 75% as an example, if the operating pressure corresponding to each tire is determined by multiplying each ratio by the recommended air pressure value of the vehicle, the operating pressure of the left front tire is 200KPa, the operating pressure of the right front tire is 200KPa, the operating pressure of the left rear tire is 220KPa, and the operating pressure of the right rear tire is 180KPa, then the under-pressure alarm threshold of the left front tire is 150KPa, the operating pressure of the right front tire is 150KPa, the under-pressure alarm threshold of the left rear tire is 165KPa, and the under-pressure alarm threshold of the right rear tire is 135KPa. In this case, the measured tire operating pressure is the pressure relative to the external atmospheric pressure, that is, the relative difference between the internal air pressure of the tire and the external atmospheric pressure. It will be affected by the change of the external atmospheric pressure, that is, the measurement result of the tire operating pressure will change with the change of the external atmospheric pressure. Therefore, under different altitudes and climate conditions, the same relative pressure value may represent different actual tire pressures. Since changes in external atmospheric pressure may affect the measurement results, measurements that do not take absolute atmospheric pressure into account may not be accurate and reliable in some cases.

[0065] Therefore, the present application can also determine the operating pressure of the tire in combination with the absolute atmospheric pressure, and the specific formula can be:

[0066]

[0067] Among them, P rec P is the recommended air pressure value for the vehicle. atm ——Absolute atmospheric pressure, take 100KPa;

[0068] T tire is the current temperature of the tire, the temperature unit is Kelvin = degrees Celsius + 273, Ttire-min is the lowest initial temperature among each initial temperature, the temperature unit is Kelvin = degrees Celsius + 273, and Twarm is the operating pressure of the tire. The operating pressure of the tire calculated in this case is the pressure relative to a complete vacuum, that is, the difference between the internal air pressure of the tire and the external atmospheric pressure. This measurement method obtains the actual pressure inside the tire and is not affected by changes in the external atmospheric pressure. That is, the measurement result of the operating pressure of the tire is not affected by changes in the atmospheric pressure at the measurement location, and is more suitable for use at different altitudes and climatic conditions. Using absolute atmospheric pressure as a reference can provide more accurate and reliable tire pressure measurement results because it eliminates the errors caused by changes in external atmospheric pressure.

[0069] S103: Determine the tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with the corresponding under-pressure alarm threshold.

[0070] The first device may determine the tire pressure value of each tire at the current moment, and then compare the tire pressure value of each tire with the corresponding under-pressure alarm threshold. It should be noted that a corresponding under-pressure alarm threshold is calculated for each tire, and the under-pressure alarm threshold of each tire may be different, so it is necessary to compare the tire pressure value of each tire with the corresponding under-pressure alarm threshold.

[0071] S104: If the tire pressure value is greater than or equal to the under-pressure alarm threshold, determine that the tire pressure of the corresponding tire is abnormal.

[0072] If the tire pressure value is greater than or equal to the under-pressure alarm threshold, the tire pressure of the corresponding tire is determined to be abnormal. For example, if the under-pressure alarm threshold of the left front tire is 150KPa, and the tire pressure value corresponding to the left front tire is determined to be 160, the tire pressure of the left front tire is determined to be abnormal. If the under-pressure alarm threshold of the left front tire is 150KPa, and the tire pressure value corresponding to the left front tire is determined to be 140, the tire pressure of the left front tire is determined to be normal.

[0073] In an embodiment of the present application, when it is determined that there is a tire with abnormal tire pressure, abnormal information of the tire with abnormal tire pressure can also be sent to the display system so that the display system can display and warn according to the abnormal information, wherein the abnormal information at least includes the tire identification and tire pressure value.

[0074] For example, if it is determined that the tire pressure of the left front tire is abnormal, the identification and tire pressure value of the left front tire can be reported to the display system, and the display system can display the tire pressure abnormality of the left front tire and the tire pressure value of the left front tire.

[0075] Determine the ratio of the ambient temperature to the current temperature of each tire; determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the vehicle, wherein the recommended air pressure value of the vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model for the expected application conditions of a given vehicle; determine the tire pressure value corresponding to each tire, compare the tire pressure value of each tire with the corresponding underpressure alarm threshold, and if there is a situation where the tire pressure value is greater than or equal to the underpressure alarm threshold, determine that the tire pressure of the corresponding tire is abnormal. In this application, the ambient temperature and the tire temperature are combined for calculation, and the ambient temperature is taken into account, thereby reducing the impact of the external ambient temperature on the tire pressure, thereby improving the accuracy of tire pressure abnormality detection, thereby reducing safety hazards and improving the user experience.

[0076] The above are some specific implementations of the tire pressure abnormality detection method provided in the embodiment of the present application. Based on this, the present application also provides a corresponding device. The device provided in the embodiment of the present application will be introduced from the perspective of functional modularization. The device and the tire pressure abnormality detection method described above can be referred to each other.

[0077] Figure 2 The structural block diagram of the tire pressure abnormality detection device provided by the embodiment of the present invention is referred to as the specific implementation mode 2. Figure 2 The device may include:

[0078] A first determination unit 210, configured to determine a ratio of the ambient temperature to the current temperature of each tire;

[0079] A second determination unit 220 is used to determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the vehicle recommended air pressure value, wherein the vehicle recommended air pressure value is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle;

[0080] A comparison unit 230, used to determine a tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with a corresponding under-pressure alarm threshold;

[0081] The third determination unit 240 is configured to determine that the tire pressure of the corresponding tire is abnormal if the tire pressure value is greater than or equal to the under-pressure alarm threshold.

[0082] Optionally, the second determining unit is specifically configured to:

[0083] Determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the vehicle;

[0084] The underpressure alarm threshold corresponding to each tire is determined according to each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs.

[0085] Optionally, the first determining unit is specifically configured to:

[0086] Obtaining a first frame of message data reported by a sensor after the vehicle is powered on, wherein the first frame of message data includes an initial temperature of each tire of the vehicle;

[0087] The lowest initial temperature among the initial temperatures is determined as the ambient temperature.

[0088] Optionally, the device further comprises:

[0089] The sending unit is used to send abnormal information of the tire with abnormal tire pressure to the display system, so that the display system displays and warns according to the abnormal information, and the abnormal information at least includes the tire identification and tire pressure value.

[0090] Optionally, the operating pressure corresponding to the tire is determined according to the product of the ratio and the recommended air pressure value of the vehicle, and the formula is:

[0091]

[0092] Among them, P rec P is the recommended air pressure value for the vehicle. atm ——Absolute atmospheric pressure, take 100KPa;

[0093] T tire is the current temperature of the tire, the temperature unit is Kelvin = Celsius + 273, T tire-min is the lowest initial temperature among each initial temperature, the temperature unit is Kelvin = Celsius + 273, T warm The operating pressure of the tire.

[0094] An embodiment of the present application provides a vehicle controller, including: a processor and a memory;

[0095] Wherein, one or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the vehicle controller executes the method described in the first aspect.

[0096] An embodiment of the present application provides a computer storage medium, in which codes are stored. When the codes are executed, a device executing the codes implements the method described in the first aspect above.

[0097] An embodiment of the present application provides a vehicle, which includes the device described in the second aspect.

[0098] The "first" and "second" in the names such as "first" and "second" (if any) mentioned in the embodiments of the present application are only used as name identifiers and do not represent the first or second in order.

[0099] Through the description of the above implementation methods, it can be known that those skilled in the art can clearly understand that all or part of the steps in the above-mentioned embodiment method can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in each embodiment of the present application or some parts of the embodiments.

[0100] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0101] The above description is merely an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A method for detecting abnormal tire pressure, characterized in that: include: determining a ratio of the ambient temperature to the current temperature of each tire; Determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle; Determine a tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with a corresponding under-pressure alarm threshold; If the tire pressure value is greater than or equal to the under-pressure warning threshold, it is determined that the tire pressure of the corresponding tire is abnormal.

2. The method according to claim 1, characterized in that The method of determining the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the vehicle includes: Determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the vehicle; The underpressure alarm threshold corresponding to each tire is determined according to each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs.

3. The method according to claim 1, characterized in that The ambient temperature is determined by: Obtaining a first frame of message data reported by a sensor after the vehicle is powered on, wherein the first frame of message data includes an initial temperature of each tire of the vehicle; The lowest initial temperature among the initial temperatures is determined as the ambient temperature.

4. The method according to claim 3, characterized in that The operating pressure corresponding to the tire is determined by multiplying the ratio by the recommended air pressure value of the vehicle, and the formula is: Among them, P rec P is the recommended air pressure value for the vehicle. atm ——Absolute atmospheric pressure, take 100KPa; T tire is the current temperature of the tire, the temperature unit is Kelvin = Celsius + 273, T tire-min is the lowest initial temperature among each initial temperature, the temperature unit is Kelvin = Celsius + 273, T warm The operating pressure of the tire.

5. The method according to claim 1, characterized in that When it is determined that there is a tire with abnormal tire pressure, the method further includes: Abnormal information of a tire with abnormal tire pressure is sent to a display system so that the display system displays and warns according to the abnormal information, wherein the abnormal information at least includes a tire identification and a tire pressure value.

6. A tire pressure abnormality detection device, characterized in that: include: A first determination unit, used to determine a ratio of the ambient temperature to the current temperature of each tire; A second determination unit is used to determine the underpressure alarm threshold corresponding to each tire according to the product of each ratio and the recommended air pressure value of the whole vehicle, wherein the recommended air pressure value of the whole vehicle is the inflation pressure recommended by the vehicle manufacturer for the vehicle model according to the expected application conditions of the given vehicle; A comparison unit, used to determine the tire pressure value corresponding to each tire, and compare the tire pressure value of each tire with the corresponding under-pressure alarm threshold; The third determination unit is used to determine that the tire pressure of the corresponding tire is abnormal if the tire pressure value is greater than or equal to the under-pressure alarm threshold.

7. The device according to claim 6, characterized in that The second determining unit is specifically configured to: Determine the operating pressure corresponding to each tire based on the product of each ratio and the recommended air pressure value of the vehicle; The underpressure alarm threshold corresponding to each tire is determined according to each operating pressure and a preset fixed ratio value, wherein the preset fixed ratio value is determined according to the automobile standard of the region to which the vehicle belongs.

8. The device according to claim 6, characterized in that The first determining unit is specifically configured to: Obtaining a first frame of message data reported by a sensor after the vehicle is powered on, wherein the first frame of message data includes an initial temperature of each tire of the vehicle; The lowest initial temperature among the initial temperatures is determined as the ambient temperature.

9. The device according to claim 6, characterized in that The device also includes: The sending unit is used to send abnormal information of the tire with abnormal tire pressure to the display system, so that the display system displays and warns according to the abnormal information, and the abnormal information at least includes the tire identification and tire pressure value.

10. A vehicle controller, characterized in that: include: Processor and memory; Wherein, one or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the vehicle controller executes the method as described in any one of claims 1-5.

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