A tire pressure monitoring system and a calibration method of a BLE tire pressure sensor

Abstract

The present application relates to a kind of tire pressure monitoring system and the calibration method of BLE tire pressure sensor.The tire pressure monitoring system includes: BLE master node;BLE tire pressure sensor, is arranged on the wheel and is used to obtain the state information of corresponding tire and send to BLE master node;BLE positioning anchor point, is installed to the body of vehicle, and is accessed to vehicle network by physical connection, the ID identification of BLE positioning anchor point and the RSSI data of scanned BLE tire pressure sensor are sent to BLE master node by vehicle network, the position of the tire of BLE tire pressure sensor based on the ID identification of BLE positioning anchor point and RSSI data calibration is marked.The present application proposes a kind of tire pressure monitoring system and the calibration method of BLE tire pressure sensor, can automatically realize the calibration of tire pressure sensor, while it can be realized to the relay of tire pressure sensor data, improve the safety and reliability of vehicle operation.

Description

Technical Field

[0001] This invention relates to the field of vehicle autonomous driving technology, and in particular to a tire pressure monitoring system and a calibration method for a BLE tire pressure sensor. Background Technology

[0002] With the development of automotive technology, vehicle safety and convenience have received increasing attention. Among these, BLE digital keys and tire pressure monitoring systems (TPMS) are two important technologies. BLE digital keys enable keyless entry and start, improving the user experience; while TPMS monitors tire pressure and temperature in real time, ensuring driving safety. However, these two systems are typically independent, requiring separate hardware and software support, increasing cost and complexity. Therefore, it is necessary to develop a system that combines these two functions to reduce costs and improve integration.

[0003] Chinese patent application CN116424265A discloses a smart key entry and start device with integrated tire pressure monitoring, a control method, and a method for calibrating the tire pressure sensor position using data such as wheel speed, Bluetooth Received Signal Strength Indication (RSSI), and Angle-of-Arrival (AOA). Since wheel speed and RSSI are asynchronous, RSSI is highly susceptible to environmental influences during vehicle movement. The calibration process using this method is complex and, theoretically, cannot achieve precise calibration. Furthermore, this patented technology requires calibration of each tire's position while the vehicle is in motion. For inexperienced car owners, recalibrating data after changing mobile devices is a difficult task.

[0004] Chinese patent application CN116424265A discloses a smart key entry and start device, control method, and vehicle with integrated tire pressure monitoring. Its technical solution mainly utilizes low-frequency signals to activate the tire pressure sensor, increasing system cost. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention proposes a tire pressure monitoring system and a calibration method for a BLE tire pressure sensor, which can automatically calibrate the tire pressure sensor and improve the safety and reliability of vehicle operation.

[0006] Specifically, the present invention proposes a tire pressure monitoring system, comprising:

[0007] BLE master node;

[0008] The BLE tire pressure sensor is installed on the wheel and used to acquire the status information of the corresponding tire. The BLE tire pressure sensor sends the acquired tire status information to the BLE master node.

[0009] BLE positioning anchors are installed on the vehicle body and connected to the vehicle network via physical connections. The BLE positioning anchors send their own ID and the RSSI data of the scanned BLE tire pressure sensor to the BLE master node through the vehicle network. The BLE master node determines the position of the tire where the BLE tire pressure sensor is located based on the ID and RSSI data of the BLE positioning anchors.

[0010] According to one embodiment of the present invention, the BLE master node determines the position of the BLE positioning anchor point on the vehicle body based on the ID identifier of the BLE positioning anchor point. The BLE master node filters and analyzes the received RSSI data and sorts it according to signal strength. Based on the position of the BLE positioning anchor point on the vehicle body and the signal strength, the BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located.

[0011] According to one embodiment of the present invention, if the corresponding tire acceleration obtained by the BLE tire pressure sensor is 0, then slow Bluetooth broadcast is initiated to broadcast a Bluetooth signal, the Bluetooth signal containing the ID identifier of the BLE tire pressure sensor;

[0012] The BLE master node scans the Bluetooth signal of the BLE tire pressure sensor and establishes a Bluetooth connection with the BLE tire pressure sensor based on its ID identifier.

[0013] According to one embodiment of the present invention, after the BLE master node establishes a connection with the BLE tire pressure sensor, the BLE tire pressure sensor sends the acquired tire status information to the BLE master node based on the corresponding tire pressure and / or acceleration changes.

[0014] According to one embodiment of the present invention, the BLE tire pressure sensor is powered by an independent power supply.

[0015] According to one embodiment of the present invention, the tire pressure monitoring system further includes a vehicle body control unit and a BLE digital key, wherein the BLE digital key initiates Bluetooth broadcast to broadcast an ID identifier containing the BLE digital key, and the BLE master node scans the Bluetooth signal and establishes a Bluetooth connection based on the ID identifier of the BLE digital key;

[0016] The vehicle body control unit performs actions such as unlocking the door locks and / or starting the vehicle based on the BLE master node's recognition result of the BLE digital key.

[0017] According to one embodiment of the present invention, the BLE master node sends the location of the tire where the BLE tire pressure sensor is located and the corresponding tire status information to the vehicle control unit via the vehicle network.

[0018] This invention also provides a calibration method for a BLE tire pressure sensor, applicable to the aforementioned tire pressure monitoring system, comprising the following steps:

[0019] S1, The BLE tire pressure sensor is set on the wheel to obtain the status information of the corresponding tire;

[0020] S2, the BLE tire pressure sensor establishes a Bluetooth connection with the BLE master node, and the BLE tire pressure sensor sends the acquired tire status information to the BLE master node;

[0021] S3, install multiple BLE positioning anchors onto the vehicle body and connect them to the vehicle network via physical connections. The BLE positioning anchors send their ID identifiers to the BLE master node through the vehicle network. The BLE master node obtains the relative position of the BLE positioning anchors on the vehicle body based on the ID identifiers of the BLE positioning anchors.

[0022] S4, the BLE master node sends a calibration notification to each of the BLE positioning anchors. After receiving the calibration notification, the BLE positioning anchors start scanning the BLE tire pressure sensor via Bluetooth broadcast. The BLE positioning anchors send their own ID and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the ID and RSSI data of the BLE positioning anchors.

[0023] S5, the BLE master node stores the ID identifier of the BLE tire pressure sensor and the location of the tire it is located on.

[0024] According to an embodiment of the present invention, in step S4, the BLE master node filters and analyzes the received RSSI data and sorts it according to signal strength. Based on the position of the BLE positioning anchor point on the vehicle body and the signal strength, the BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located.

[0025] According to an embodiment of the present invention, the calibration method further includes step S6, in which the BLE master node sends the location of the tire where the BLE tire pressure sensor is located and the tire status information obtained therefrom to the outside via the vehicle network according to the vehicle operating status.

[0026] According to one embodiment of the present invention, if a BLE tire pressure sensor is replaced, and the BLE master node finds that there is no ID identifier for the BLE tire pressure sensor, then steps S4 and S5 are executed to calibrate the BLE tire pressure sensor and save the ID identifier of the BLE tire pressure sensor and the position of the tire in which it is located.

[0027] According to one embodiment of the present invention, the BLE tire pressure sensor is upgraded via OTA through the vehicle network according to the diagnostic requirements of the vehicle network system.

[0028] According to an embodiment of the present invention, if the tire status information of the BLE tire pressure sensor obtained by the BLE master node is abnormal or cannot be collected, the following steps are performed:

[0029] T1, traverse all BLE positioning anchors, and the BLE master node sends a calibration notification to the BLE positioning anchor closest to the BLE tire pressure sensor;

[0030] T2, the BLE positioning anchor point starts scanning the BLE tire pressure sensor via Bluetooth broadcast. If the BLE positioning anchor point establishes a connection with the BLE tire pressure sensor, the BLE positioning anchor point sends its own ID and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network. If the connection fails to connect after a timeout, the anchor point sends a feedback to the BLE master node and returns to step T1.

[0031] According to one embodiment of the present invention, if the BLE master node cannot collect the tire status information of a certain BLE tire pressure sensor, the BLE master node designates one or more BLE positioning anchor points to receive the tire status information of the BLE tire pressure sensor according to the proximity principle. The BLE positioning anchor points serve as relay nodes of the BLE master node and are used to transmit the tire status information of the BLE tire pressure sensor to the BLE master node.

[0032] This invention provides a tire pressure monitoring system and a calibration method for a BLE tire pressure sensor. By installing multiple BLE positioning anchors on the vehicle, the BLE positioning anchors scan the RSSI data of the BLE tire pressure sensor. Based on the ID of the BLE positioning anchors and the RSSI data, the position of the tire where the BLE tire pressure sensor is located is calibrated, thereby automatically calibrating the tire pressure sensor and improving the safety and reliability of vehicle operation.

[0033] It should be understood that the above general description and the following detailed description of the invention are exemplary and illustrative, and are intended to provide further explanation of the invention as described in the claims. Attached Figure Description

[0034] 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.

[0035] In the attached image:

[0036] Figure 1 A schematic diagram of a tire pressure monitoring system according to an embodiment of the present invention is shown.

[0037] Figure 2 A flowchart of a calibration method for a BLE tire pressure sensor according to an embodiment of the present invention is shown. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0039] 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 a part of the embodiments of this application, and not all of them. 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Figure 1 A schematic diagram of a tire pressure monitoring system according to an embodiment of the present invention is shown. As shown in the figure, a tire pressure monitoring system 100 mainly includes a BLE master node 101, a BLE tire pressure sensor 102, and a BLE positioning anchor point 103.

[0045] Multiple BLE tire pressure sensors 102 are installed on the wheels to acquire the status information of the corresponding tires. Typically, one BLE tire pressure sensor 102 is installed on each tire of the vehicle. The number of BLE tire pressure sensors 102, m, is determined by the number of tires on the vehicle. Taking a four-wheeled vehicle as an example, m is 4, meaning four BLE tire pressure sensors 102 are configured. The BLE tire pressure sensors 102 send the acquired tire status information to the BLE master node 101.

[0046] Multiple BLE positioning anchors 103 are installed on the vehicle body and connected to the vehicle network via physical wiring. The number of BLE positioning anchors 103 is n, where n is greater than or equal to m, to ensure that each BLE tire pressure sensor 102 can be positioned by one BLE positioning anchor 103. The BLE positioning anchor 103 sends its own ID and the RSSI data of the scanned BLE tire pressure sensor 102 to the BLE master node 101 through the vehicle network. The BLE master node 101 calibrates the position of the tire where the BLE tire pressure sensor 102 is located based on the ID and RSSI data of the BLE positioning anchor 103, thereby automatically calibrating the BLE tire pressure sensor 102.

[0047] Preferably, the BLE master node 101 determines the position of the BLE positioning anchor 103 on the vehicle body based on the ID identifier of the BLE positioning anchor 103. Since the BLE positioning anchor 103 is connected to the BLE master node 101 through the vehicle network, its position and distance relative to the BLE master node 101 are determined. That is, the BLE master node 101 can know the position of each BLE positioning anchor 103 on the vehicle body. The BLE master node 101 filters and analyzes the received RSSI data and sorts it according to signal strength. Based on the position of the BLE positioning anchor 103 on the vehicle body and the signal strength, the BLE master node 101 calibrates the position of the tire where the BLE tire pressure sensor 102 is located. For example, if a BLE positioning anchor 103 is installed on the wheel arch of the right rear wheel of the vehicle, the RSSI data of the strongest signal received should come from the BLE tire pressure sensor 102 installed on the right rear wheel. Based on the BLE positioning anchor point 103 and the RSSI data it receives, the BLE master node 101 calibrates the corresponding BLE tire pressure sensor 102 on the right rear wheel.

[0048] Preferably, if the tire acceleration acquired by the BLE tire pressure sensor 102 is 0, a slow Bluetooth broadcast is initiated to broadcast a Bluetooth signal containing the ID of the BLE tire pressure sensor 102. The BLE master node 101 scans the Bluetooth signal of the BLE tire pressure sensor 102 and establishes a Bluetooth connection with the BLE tire pressure sensor 102 based on the ID. At this time, although the BLE master node 101 establishes a Bluetooth connection with the BLE tire pressure sensor 102, it cannot determine the location of the BLE tire pressure sensor 102. The location of the BLE tire pressure sensor 102 needs to be determined through the BLE positioning anchor point 103.

[0049] Preferably, after the BLE master node 101 establishes a connection with the BLE tire pressure sensor 102, the BLE tire pressure sensor 102 sends the acquired tire status information and its own ID identifier to the BLE master node 101 according to the corresponding tire pressure and / or acceleration changes.

[0050] Preferably, the BLE tire pressure sensor 102 is powered by an independent power source. The BLE positioning anchor 103 can be powered via the vehicle network.

[0051] Preferably, the tire pressure monitoring system 100 also includes a body control unit 104 and a BLE digital key 105. The BLE digital key 105 initiates Bluetooth broadcasting to broadcast its ID identifier. The BLE master node 101 scans Bluetooth signals and establishes a Bluetooth connection based on the BLE digital key 105's ID identifier. The body control unit 104, based on the BLE master node 101's recognition of the BLE digital key 105, performs actions such as unlocking the doors and / or starting the vehicle. Specifically, the BLE master node 101 can be used to calibrate both the BLE tire pressure sensor 102 and the BLE digital key 105. This reuse of the BLE master node 101 reduces equipment and installation costs, decreases the number of devices, and lowers the overall complexity of the vehicle system.

[0052] Preferably, the BLE master node 101 sends the location of the tire where the BLE tire pressure sensor 102 is located and the corresponding tire status information to the vehicle control unit 104 via the vehicle network. The vehicle control unit 104 can then execute vehicle control strategies based on the tire status information to improve driving safety.

[0053] Figure 2 A flowchart illustrating a calibration method for a BLE tire pressure sensor according to an embodiment of the present invention is shown. As shown, the present invention also provides a calibration method for a BLE tire pressure sensor, applicable to the aforementioned tire pressure monitoring system 100, comprising the following steps:

[0054] S1, Set the BLE tire pressure sensor 102 to the wheel to obtain the status information of the corresponding tire;

[0055] S2, the BLE tire pressure sensor 102 establishes a Bluetooth connection with the BLE master node 101, and the BLE tire pressure sensor 102 sends the acquired tire status information (including its own ID identifier) ​​to the BLE master node 101;

[0056] S3, multiple BLE positioning anchors 103 are installed on the vehicle body and connected to the vehicle network via physical connections. Each BLE positioning anchor 103 sends its ID identifier to the BLE master node 101 through the vehicle network. The BLE master node 101 obtains the relative position of each BLE positioning anchor 103 on the vehicle body based on its ID identifier. As mentioned earlier, since each BLE positioning anchor 103 is connected to the BLE master node 101 through the vehicle network, its position and distance relative to the BLE master node 101 are determined. In other words, the BLE master node 101 can know the position of each BLE positioning anchor 103 on the vehicle body.

[0057] S4, the BLE master node 101 sends a calibration notification to each BLE positioning anchor 103. Upon receiving the calibration notification, each BLE positioning anchor 103 initiates Bluetooth broadcasting to scan the BLE tire pressure sensor 102. The BLE positioning anchor 103 sends its own ID, the scanned RSSI data of the BLE tire pressure sensor 102, and the ID of the BLE tire pressure sensor 102 to the BLE master node 101 via the vehicle network. The BLE master node 101 calibrates the tire position of the BLE tire pressure sensor 102 based on the ID and RSSI data of the BLE positioning anchor 103. For example, if a BLE positioning anchor 103 is installed on the right rear wheel arch, the strongest RSSI data it receives should come from the BLE tire pressure sensor 102 installed on the right rear wheel. The BLE master node 101 matches the ID identifier of the BLE tire pressure sensor 102 corresponding to the BLE positioning anchor point 103 and the RSSI data of the strongest signal it receives with the received tire status information, and then calibrates the corresponding BLE tire pressure sensor 102 to the right rear wheel.

[0058] S5, the BLE master node 101 stores the ID of the BLE tire pressure sensor 102 and the location of the tire it is on. The BLE master node 101 determines the source of the received tire status information and which tire of the vehicle has the BLE tire pressure sensor 102 based on the ID of the BLE tire pressure sensor 102.

[0059] Preferably, in step S4, the BLE master node 101 filters and analyzes the received RSSI data and sorts it according to signal strength. Based on the position of the BLE positioning anchor point 103 on the vehicle body and the signal strength, the BLE master node 101 calibrates the position of the tire where the BLE tire pressure sensor 102 is located. It should be noted that a strong RSSI signal indicates a close distance, and a weak signal indicates a far distance.

[0060] Preferably, the calibration method for the BLE tire pressure sensor 102 further includes step S6, whereby the BLE master node 101 sends the location of the tire where the BLE tire pressure sensor 102 is located and the tire status information it has acquired to the outside of the vehicle network according to the vehicle's operating status, so as to facilitate subsequent vehicle operation control.

[0061] Preferably, if a BLE tire pressure sensor 102 is replaced, and the BLE master node 101 detects that the ID identifier of the BLE tire pressure sensor 102 is missing (i.e., a signal indicating an ID identifier not present in the original stored information), then steps S4 and S5 are executed to calibrate the BLE tire pressure sensor 102, saving the ID identifier of the BLE tire pressure sensor 102 and the location of the tire it is located on. In other words, when the BLE tire pressure sensor 102 is replaced, the BLE master node 101 automatically initiates calibration to identify the location of the new BLE tire pressure sensor 102.

[0062] Preferably, the BLE tire pressure sensor 102 is upgraded over-the-air (OTA) via the vehicle network according to the diagnostic requirements of the vehicle network system. In other words, the BLE master node 101 can perform over-the-air upgrades on the BLE tire pressure sensor 102, further enhancing vehicle safety.

[0063] Preferably, if the tire status information obtained by the BLE master node 101 from the BLE tire pressure sensor 102 is abnormal or cannot be collected, the following steps are executed:

[0064] T1, traverse all BLE positioning anchors 103, and BLE master node 101 sends a calibration notification to the BLE positioning anchor 103 closest to the BLE tire pressure sensor 102.

[0065] T2, according to the calibration notification, BLE positioning anchor 103 starts Bluetooth broadcasting to scan BLE tire pressure sensor 102. If BLE positioning anchor 103 establishes a connection with BLE tire pressure sensor 102, BLE positioning anchor 103 sends its own ID and the scanned RSSI data of BLE tire pressure sensor 102 to BLE master node 101 through the vehicle network. That is, BLE master node 101 recalibrates BLE tire pressure sensor 102 to obtain the corresponding tire status information.

[0066] If the connection fails to connect within a timeout period, feedback is sent to the BLE master node, returning to step T1. The BLE master node then sends a calibration notification to the BLE positioning anchor point closest to the BLE tire pressure sensor among the remaining BLE positioning anchor points, and executes step T2.

[0067] Preferably, if the BLE master node cannot collect tire status information from a particular BLE tire pressure sensor, it designates one or more BLE anchor points to receive the tire status information from that sensor, based on proximity. These designated BLE anchor points then act as relay nodes for the BLE master node, transmitting the tire status information to it. For example, if the vehicle is long and the BLE master node cannot collect tire status information from a particular BLE tire pressure sensor due to distance, it designates one or more BLE anchor points near the sensor to receive the information. If the designated anchor point can receive the tire status information, it acts as a relay node for the BLE master node, transmitting the received information to it. In other words, the tire status information from the BLE tire pressure sensors is transmitted to the BLE positioning anchor point via Bluetooth, and then sent to the BLE master node through the vehicle network. This ensures that the BLE master node can obtain tire status information from all BLE tire pressure sensors on the vehicle. The vehicle control system can adjust its vehicle control strategy based on the tire status information from the BLE master node to ensure the safety and reliability of vehicle operation.

[0068] The tire pressure monitoring system and BLE tire pressure sensor calibration method provided by this invention have the following advantages:

[0069] The BLE tire pressure sensor is automatically and accurately calibrated. The BLE master node automatically calibrates the position of the BLE tire pressure sensor for each vehicle tire. The RSSI value of each BLE tire pressure sensor is collected through different BLE positioning anchor points. By comparing the strength of the RSSI data, the position of the BLE tire pressure sensor is accurately calibrated.

[0070] BLE positioning anchors can be used for proxy relay services; if the BLE master node cannot receive or needs to verify tire pressure sensor data within a certain period of time, it can use a nearby BLE positioning anchor as a proxy relay to read tire pressure data from the BLE tire pressure sensor; on the one hand, it enhances data security, and on the other hand, it can receive Bluetooth tire pressure device data through multiple channels.

[0071] Over-the-air (OTA) upgrades can be performed on various Bluetooth tire pressure monitoring devices via the BLE master node, improving vehicle safety.

[0072] The BLE master node is reused in the BLE digital key, which reduces equipment and installation costs, reduces the number of devices, and lowers the overall complexity of the vehicle system.

[0073] 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 pressure monitoring system, comprising: BLE master node; The BLE tire pressure sensor is installed on the wheel and used to acquire the status information of the corresponding tire. The BLE tire pressure sensor sends the acquired tire status information to the BLE master node. BLE positioning anchors are installed on the vehicle body and connected to the vehicle network via physical connections. The BLE positioning anchors send their own ID and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network. The BLE master node determines the position of the tire where the BLE tire pressure sensor is located based on the ID and RSSI data of the BLE positioning anchors. The BLE master node determines the position of the BLE positioning anchor point on the vehicle body based on the ID identifier of the BLE positioning anchor point. The BLE master node filters and analyzes the received RSSI data and sorts it according to the signal strength. Based on the position of the BLE positioning anchor point on the vehicle body and the signal strength, the BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located. During the calibration phase, if the corresponding tire acceleration obtained by the BLE tire pressure sensor is 0, then slow Bluetooth broadcast is initiated to broadcast a Bluetooth signal, which includes the ID identifier of the BLE tire pressure sensor. The BLE master node scans the Bluetooth signal and establishes a Bluetooth connection based on the ID of the BLE tire pressure sensor.

2. The tire pressure monitoring system as described in claim 1, characterized in that, After the BLE master node establishes a connection with the BLE tire pressure sensor, the BLE tire pressure sensor sends the acquired tire status information to the BLE master node based on the corresponding tire pressure and / or acceleration changes.

3. The tire pressure monitoring system as described in claim 1, characterized in that, The BLE tire pressure sensor is powered by an independent power source.

4. The tire pressure monitoring system as described in claim 1, characterized in that, The tire pressure monitoring system also includes a vehicle body control unit and a BLE digital key. The BLE digital key initiates Bluetooth broadcasting to broadcast an ID identifier containing the BLE digital key. The BLE master node scans the Bluetooth signal and establishes a Bluetooth connection based on the ID identifier of the BLE digital key. The vehicle body control unit performs actions such as unlocking the door locks and / or starting the vehicle based on the BLE master node's recognition result of the BLE digital key.

5. The tire pressure monitoring system as described in claim 4, characterized in that, The BLE master node sends the location of the tire where the BLE tire pressure sensor is located and the corresponding tire status information to the vehicle control unit via the vehicle network.

6. A calibration method for a BLE tire pressure sensor, applicable to the tire pressure monitoring system as described in claim 1, characterized in that, Including the following steps: S1, The BLE tire pressure sensor is set on the wheel to obtain the status information of the corresponding tire; S2, the BLE tire pressure sensor establishes a Bluetooth connection with the BLE master node, and the BLE tire pressure sensor sends the acquired tire status information to the BLE master node; S3, install multiple BLE positioning anchors onto the vehicle body and connect them to the vehicle network via physical connections. The BLE positioning anchors send their ID identifiers to the BLE master node through the vehicle network. The BLE master node obtains the relative position of the BLE positioning anchors on the vehicle body based on the ID identifiers of the BLE positioning anchors. S4, the BLE master node sends a calibration notification to each of the BLE positioning anchors. After receiving the calibration notification, the BLE positioning anchors start Bluetooth broadcasting to scan the BLE tire pressure sensor. The BLE positioning anchors send their own ID and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the ID and RSSI data of the BLE positioning anchors. S5, the BLE master node stores the ID identifier of the BLE tire pressure sensor and the location of the tire it is located on; In step S4, the BLE master node filters and analyzes the received RSSI data and sorts it according to signal strength. Based on the position of the BLE positioning anchor point on the vehicle body and the signal strength, the BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located. If the tire status information obtained by the BLE master node from the BLE tire pressure sensor is abnormal or cannot be collected, the following steps are executed: T1, traverse all BLE positioning anchors, and the BLE master node sends a calibration notification to the BLE positioning anchor closest to the BLE tire pressure sensor; T2, the BLE positioning anchor point starts scanning the BLE tire pressure sensor via Bluetooth broadcast. If the BLE positioning anchor point establishes a connection with the BLE tire pressure sensor, the BLE positioning anchor point sends its own ID and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network. If the connection fails to connect after a timeout, the BLE master node is notified and the process returns to step T1. If the BLE master node cannot collect tire status information from a certain BLE tire pressure sensor, the BLE master node will designate one or more BLE positioning anchor points to receive the tire status information from the BLE tire pressure sensor according to the proximity principle. The BLE positioning anchor points will then serve as relay nodes of the BLE master node to transmit the tire status information from the BLE tire pressure sensor to the BLE master node.

7. The calibration method for a BLE tire pressure sensor as described in claim 6, characterized in that, It also includes step S6, in which the BLE master node sends the location of the tire where the BLE tire pressure sensor is located and the tire status information it has acquired to the outside world through the vehicle network according to the vehicle's operating status.

8. The calibration method for a BLE tire pressure sensor as described in claim 6, characterized in that, If one of the BLE tire pressure sensors is replaced, the BLE master node will find that the ID of the BLE tire pressure sensor is missing. Perform steps S4 and S5 to calibrate the BLE tire pressure sensor and save the ID identifier of the BLE tire pressure sensor and the location of the tire.

9. The calibration method for a BLE tire pressure sensor as described in claim 6, characterized in that, According to the diagnostic requirements of the vehicle network system, the BLE tire pressure sensor can be upgraded via OTA through the vehicle network.

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