Tire pressure monitoring system and calibration method for BLE tire pressure sensor

Abstract

A tire pressure monitoring system (100) and a calibration method for a BLE tire pressure sensor (102). The tire pressure monitoring system (100) comprises: a BLE master node (101); BLE tire pressure sensors (102), which are arranged on wheels, and are configured to acquire state information of corresponding tires and send same to the BLE master node (101); and BLE positioning anchors (103), which are mounted on a vehicle body of a vehicle, and are connected to a vehicle network by means of physical connections, wherein the BLE positioning anchors (103) send ID identifiers thereof and scanned RSSI data of the BLE tire pressure sensors (102) to the BLE master node (101) by means of the vehicle network, and on the basis of the ID identifiers of the BLE positioning anchors (103) and the RSSI data, the BLE master node (101) calibrates the positions of the tires on which the BLE tire pressure sensors (102) are located. The present tire pressure monitoring system (100) is capable of automatically calibrating the tire pressure sensors (102), and can relay data from the tire pressure sensors (102), thereby improving the safety and reliability of vehicle operation.

Description

A tire pressure monitoring system and a calibration method for a BLE tire pressure sensor Technical Field

[0001] The present 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 Art

[0002] With the advancement of automotive technology, vehicle safety and convenience are receiving increasing attention. Two key technologies are Bluetooth Low Energy (BLE) digital keys and tire pressure monitoring systems (TPMS). BLE digital keys enable keyless entry and starting, improving the user experience; while TPMS monitors tire pressure and temperature in real time to ensure driving safety. However, these two systems are typically independent, requiring their own 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 vehicle that needs to use data such as wheel speed while the vehicle is running, as well as Bluetooth received signal strength indication (RSSI) and angle of arrival (AOA) data to calibrate the position of the tire pressure sensor. Since the wheel speed and RSSI are not synchronized, RSSI is greatly affected by the environment when in motion. The calibration process using this method is complex, and it is technically impossible to make an accurate calibration. At the same time, the patented technology also requires calibration of each tire position while the vehicle is running. For unskilled car owners, it is very difficult to recalibrate the data after replacing the mobile device.

[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 primarily utilizes a low-frequency signal to wake up the tire pressure sensor, increasing system costs.

[0005] Summary of the Invention

[0006] In response to the above-mentioned problems in the prior art, the present 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.

[0007] Specifically, the present invention provides a tire pressure monitoring system, comprising:

[0008] BLE master node;

[0009] A BLE tire pressure sensor is provided on a wheel and is used to obtain status information of a corresponding tire, and the BLE tire pressure sensor sends the obtained tire status information to the BLE master node;

[0010] The BLE positioning anchor point is installed on the body of the vehicle and connected to the vehicle network through a physical connection. The BLE positioning anchor point sends its own ID identifier 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 identifier and RSSI data of the BLE positioning anchor point.

[0011] 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, and the BLE master node filters and analyzes the received RSSI data and sorts it according to signal strength. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the position of the BLE positioning anchor point on the vehicle body and the signal strength.

[0012] According to one embodiment of the present invention, if the corresponding tire acceleration acquired by the BLE tire pressure sensor is 0, a slow Bluetooth broadcast is started to broadcast a Bluetooth signal, wherein the Bluetooth signal includes an ID identifier of the BLE tire pressure sensor;

[0013] 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 the ID identifier.

[0014] 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 according to the corresponding tire pressure and / or acceleration changes.

[0015] According to one embodiment of the present invention, the BLE tire pressure sensor is powered by an independent power supply.

[0016] 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 a 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;

[0017] The body control unit unlocks the door locks and / or starts the vehicle based on the recognition result of the BLE digital key by the BLE master node.

[0018] According to one embodiment of the present invention, the BLE master node sends the position of the tire where the BLE tire pressure sensor is located and the corresponding tire status information to the vehicle body control unit through the vehicle network.

[0019] The present invention also provides a calibration method for a BLE tire pressure sensor, which is applicable to the aforementioned tire pressure monitoring system, comprising the steps of:

[0020] S1, installing the BLE tire pressure sensor on a wheel to obtain status information of the corresponding tire;

[0021] 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;

[0022] S3, installing multiple BLE positioning anchor points on the vehicle body and connecting them to the vehicle network through physical connections, wherein the BLE positioning anchor points send their own ID identifiers to the BLE master node through the vehicle network; the BLE master node obtains the relative position of the BLE positioning anchor points on the vehicle body based on the ID identifiers of the BLE positioning anchor points;

[0023] S4, the BLE master node sends a calibration notification to each of the BLE positioning anchor points. After receiving the calibration notification, the BLE positioning anchor point starts a Bluetooth broadcast to scan 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 via 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 anchor point.

[0024] S5, the BLE master node saves the ID of the BLE tire pressure sensor and the location of the tire where it is located.

[0025] According to one 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. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the position of the BLE positioning anchor point on the vehicle body and the signal strength.

[0026] According to one embodiment of the present invention, the calibration method further includes step S6, wherein the BLE master node sends the position of the tire where the BLE tire pressure sensor is located and the tire status information obtained through the vehicle network according to the vehicle operating status.

[0027] According to one embodiment of the present invention, if a certain BLE tire pressure sensor is replaced, when the BLE master node finds that there is no ID identifier of the BLE tire pressure sensor, 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 location of the tire where it is located.

[0028] According to one embodiment of the present invention, based on the diagnostic requirements of the vehicle network system, the BLE tire pressure sensor is upgraded OTA through the vehicle network.

[0029] According to one 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:

[0030] T1, traverse all BLE positioning anchor points, and the BLE master node sends a calibration notification to the BLE positioning anchor point closest to the BLE tire pressure sensor;

[0031] T2, the BLE positioning anchor point starts scanning the Bluetooth broadcast of the BLE tire pressure sensor. If the BLE positioning anchor point establishes a connection with the BLE tire pressure sensor, the BLE positioning anchor point sends its own ID identifier and the scanned RSSI data of the BLE tire pressure sensor to the BLE master node through the vehicle network; if the connection fails due to timeout, the BLE master node is fed back and the process returns to step T1.

[0032] According to one embodiment of the present invention, if the BLE master node is unable to collect the tire status information of a certain BLE tire pressure sensor, the BLE master node designates one or several BLE positioning anchor points to receive the tire status information of the BLE tire pressure sensor based on the proximity principle. The BLE positioning anchor point then serves as a relay node of the BLE master node, and is used to transmit the tire status information of the BLE tire pressure sensor to the BLE master node.

[0033] The present invention provides a tire pressure monitoring system and a BLE tire pressure sensor calibration method. By installing multiple BLE positioning anchor points on a vehicle, the BLE positioning anchor points scan the RSSI data of the BLE tire pressure sensor, and calibrate the position of the tire where the BLE tire pressure sensor is located based on the ID identification and RSSI data of the BLE positioning anchor points, thereby automatically calibrating the tire pressure sensor and improving the safety and reliability of vehicle operation.

[0034] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are included to provide further explanation of the present invention, are incorporated into and constitute a part of this application, illustrate embodiments of the present invention, and together with this specification serve to explain the principles of the present invention. In the drawings:

[0036] FIG1 shows a schematic structural diagram of a tire pressure monitoring system according to an embodiment of the present invention.

[0037] FIG2 shows a flowchart of a calibration method for a BLE tire pressure sensor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0039] 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 a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0043] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0044] Figure 1 shows a schematic diagram of the structure of a tire pressure monitoring system according to an embodiment of the present invention. 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 each wheel and are used to obtain status information for the corresponding tires. Conventionally, one BLE tire pressure sensor 102 is installed on each tire of the vehicle. The number m of BLE tire pressure sensors 102 is determined based on the number of tires on the vehicle. For a four-wheeled vehicle, m is 4, indicating four BLE tire pressure sensors 102. The BLE tire pressure sensors 102 transmit the acquired tire status information to the BLE master node 101.

[0046] Multiple BLE positioning anchor points 103 are installed on the body of the vehicle and connected to the vehicle network through physical connections. The number of BLE positioning anchor points 103 is n, where n is greater than or equal to m, to ensure that each BLE tire pressure sensor 102 can be located by a BLE positioning anchor point 103. The BLE positioning anchor point 103 sends its own ID identification 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 identification and RSSI data of the BLE positioning anchor point 103, so as to automatically calibrate the BLE tire pressure sensor 102.

[0047] Preferably, the BLE master node 101 determines the position of the BLE positioning anchor point 103 on the vehicle body based on the ID identifier of the BLE positioning anchor point 103. Since the BLE positioning anchor point 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 point 103 on the vehicle body. The BLE master node 101 filters and analyzes the received RSSI data and sorts them according to signal strength. The BLE master node 101 calibrates the position of the tire where the BLE tire pressure sensor 102 is located based on the position of the BLE positioning anchor point 103 on the vehicle body and the signal strength. For example, if a BLE positioning anchor point 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. The BLE master node 101 calibrates the corresponding BLE tire pressure sensor 102 at the right rear wheel based on the BLE positioning anchor point 103 and the RSSI data received.

[0048] Preferably, if the corresponding 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 from the BLE tire pressure sensor 102 and establishes a Bluetooth connection with the BLE tire pressure sensor 102 based on the ID. At this point, 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 BLE positioning anchor point 103 is required to determine the location of the BLE tire pressure sensor 102.

[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 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 supply. The BLE positioning anchor point 103 can be powered by 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 starts a Bluetooth broadcast to broadcast an ID identifier containing the BLE digital key 105, and the BLE master node 101 scans the Bluetooth signal and establishes a Bluetooth connection based on the ID identifier of the BLE digital key 105. The body control unit 104 unlocks the door locks and / or starts the vehicle based on the recognition result of the BLE digital key 105 by the BLE master node 101. Specifically, the BLE master node 101 can be used to calibrate the BLE tire pressure sensor 102, and can also be used to calibrate the BLE digital key 105. The reuse of the BLE master node 101 reduces equipment and installation costs, reduces the number of devices, and reduces 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 body control unit 104 through the vehicle network. The body control unit 104 can execute vehicle control strategies based on the tire status information to improve driving safety.

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

[0054] S1, installing the BLE tire pressure sensor 102 on the wheel to obtain 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) to the BLE master node 101;

[0056] In step S3, multiple BLE positioning anchor points 103 are installed on the vehicle body and connected to the vehicle network via physical connections. The BLE positioning anchor point 103 sends its own ID identifier to the BLE master node 101 via the vehicle network; the BLE master node 101 obtains the relative position of the BLE positioning anchor point 103 on the vehicle body based on the ID identifier of the BLE positioning anchor point 103. As mentioned above, since the BLE positioning anchor point 103 is connected to the BLE master node 101 via 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 point 103 on the vehicle body.

[0057] In step S4, the BLE master node 101 sends a calibration notification to each BLE positioning anchor point 103. After receiving the calibration notification, the BLE positioning anchor point 103 starts scanning the Bluetooth broadcast of the BLE tire pressure sensor 102. The BLE positioning anchor point 103 sends its own ID identifier, the RSSI data of the scanned BLE tire pressure sensor 102, and the ID identifier of the BLE tire pressure sensor 102 to the BLE master node 101 via 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 identifier and RSSI data of the BLE positioning anchor point 103. For example, if a BLE positioning anchor point 103 is installed on the wheel arch of the right rear wheel of the vehicle, 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 RSSI data of the strongest signal received by the BLE positioning anchor point 103 with the received tire status information, and then calibrates the corresponding BLE tire pressure sensor 102 on the right rear wheel.

[0058] S5, the BLE master node 101 saves the ID of the BLE tire pressure sensor 102 and the location of the tire. Based on the ID of the BLE tire pressure sensor 102, the BLE master node 101 determines the source of the received tire status information and the BLE tire pressure sensor 102 on which vehicle tire.

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

[0060] Preferably, the calibration method of the BLE tire pressure sensor 102 also includes step S6, where the BLE master node 101 sends the position of the tire where the BLE tire pressure sensor 102 is located and the tire status information obtained through the vehicle network according to the vehicle operation status, so as to facilitate subsequent vehicle operation control.

[0061] Preferably, if a BLE tire pressure sensor 102 is replaced, when the BLE master node 101 detects that there is no ID for the BLE tire pressure sensor 102 (i.e., obtains a signal for an ID that is not in the original stored information), steps S4 and S5 are executed to calibrate the BLE tire pressure sensor 102 and save the ID of the BLE tire pressure sensor 102 and the location of the tire on which it is located. In other words, when a BLE tire pressure sensor 102 is replaced, the BLE master node 101 automatically initiates calibration to identify the new location of the BLE tire pressure sensor 102.

[0062] Preferably, according to the diagnostic requirements of the vehicle network system, the BLE tire pressure sensor 102 is upgraded over the air through the vehicle network. In other words, the BLE master node 101 can implement over-the-air upgrades for the BLE tire pressure sensor 102, further improving vehicle safety.

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

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

[0065] At T2, based on the calibration notification, the BLE positioning anchor point 103 starts scanning the Bluetooth broadcast of the BLE tire pressure sensor 102. If a connection is established between the BLE positioning anchor point 103 and the BLE tire pressure sensor 102, the BLE positioning anchor point 103 sends its own ID and the RSSI data of the scanned BLE tire pressure sensor 102 to the BLE master node 101 via the vehicle network. In other words, the BLE master node 101 recalibrates the BLE tire pressure sensor 102 to obtain the corresponding tire status information.

[0066] If the connection fails due to timeout, the BLE master node is fed back and the process returns to step T1. The BLE master node 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 T2.

[0067] Preferably, if the BLE master node is unable to collect the tire status information of a certain BLE tire pressure sensor, the BLE master node designates one or several BLE positioning anchor points based on the proximity principle to receive the tire status information of the BLE tire pressure sensor. The designated BLE positioning anchor point then serves as a relay node of the BLE master node, and is used to transmit the tire status information of the BLE tire pressure sensor to the BLE master node. For example, when the vehicle body is long, the BLE master node is unable to collect the tire status information of a certain BLE tire pressure sensor due to distance reasons. The BLE master node designates one or several BLE positioning anchor points close to the BLE tire pressure sensor based on the proximity principle to receive the tire status information of the BLE tire pressure sensor. If the designated BLE positioning anchor point can receive the tire status information of the BLE tire pressure sensor, it acts as a relay node of the BLE master node and transmits the received tire status information of the BLE tire pressure sensor to the BLE master node. In other words, the tire status information from the BLE tire pressure sensor is transmitted via Bluetooth signals to the BLE positioning anchor point, which is then sent to the BLE master node via 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 the vehicle control strategy based on the tire status information from the BLE master node to ensure safe and reliable vehicle operation.

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

[0069] Automatically and accurately calibrate the BLE tire pressure sensor. The BLE master node automatically calibrates the position of the BLE tire pressure sensor of 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 can be accurately calibrated.

[0070] BLE positioning anchors can be used as proxy relay services. If a BLE master node fails to 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. This not only enhances data security, but also allows for multi-channel reception of Bluetooth tire pressure device data.

[0071] Through the BLE master node, each Bluetooth tire pressure device can be upgraded over the air, improving vehicle safety.

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

[0073] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A tire pressure monitoring system, comprising: A BLE master node; A BLE tire pressure sensor, which is arranged on a wheel and is used to obtain the status information of the corresponding tire, and the BLE tire pressure sensor sends the obtained tire status information to the BLE master node; A BLE positioning anchor, which is installed on the vehicle body and is connected to the vehicle network through a physical connection. The BLE positioning anchor sends its own ID identifier and the RSSI data of the scanned BLE tire pressure sensor to the BLE master node through the vehicle network, and the BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the ID identifier and RSSI data of the BLE positioning anchor.

2. The tire pressure monitoring system according to claim 1, characterized in that, The BLE master node determines the position of the BLE positioning anchor on the vehicle body according to the ID identifier of the BLE positioning anchor. The BLE master node filters and analyzes the received RSSI data and sorts it according to the signal strength. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the position of the BLE positioning anchor on the vehicle body and the signal strength.

3. The tire pressure monitoring system according to claim 1, wherein If the acceleration of the corresponding tire obtained by the BLE tire pressure sensor is 0, start slow Bluetooth broadcasting to broadcast a Bluetooth signal, and the Bluetooth signal includes the ID identifier of the BLE tire pressure sensor; The BLE master node scans the Bluetooth signal and makes a Bluetooth connection based on the ID identifier of the BLE tire pressure sensor.

4. The tire pressure monitoring system according to claim 3, wherein, After the BLE master node establishes a connection with the BLE tire pressure sensor, the BLE tire pressure sensor sends the obtained tire status information to the BLE master node according to the change of the corresponding tire pressure and / or acceleration.

5. The tire pressure monitoring system according to claim 1, characterized in that, The BLE tire pressure sensor is powered by an independent power supply.

6. The tire pressure monitoring system according to claim 4, wherein, The tire pressure monitoring system further includes a body control unit and a BLE digital key. The BLE digital key starts Bluetooth broadcasting to broadcast the ID identifier including the BLE digital key. The BLE master node scans the Bluetooth signal and makes a Bluetooth connection based on the ID identifier of the BLE digital key; The body control unit executes unlocking the vehicle door lock and / or starting the vehicle according to the recognition result of the BLE digital key by the BLE master node.

7. The tire pressure monitoring system according to claim 6, characterized in that, The BLE master node sends the position of the tire where the BLE tire pressure sensor is located and the corresponding tire status information to the body control unit through the vehicle network.

8. 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 steps: S1, set the BLE tire pressure sensor 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 obtained tire status information to the BLE master node; S3, install a plurality of the BLE positioning anchors on the vehicle body and connect them to the vehicle network through a physical connection. The BLE positioning anchor sends its own ID identifier to the BLE master node through the vehicle network; the BLE master node obtains the relative position of the BLE positioning anchor on the vehicle body based on the ID identifier of the BLE positioning anchor; In 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 Bluetooth broadcasts of the BLE tire pressure sensors. The BLE positioning anchors send their own ID identifiers and the RSSI data of the scanned BLE tire pressure sensors to the BLE master node via 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 identifier and RSSI data of the BLE positioning anchor. In S5, the BLE master node saves the ID identifier of the BLE tire pressure sensor and the position of the tire where it is located.

9. The calibration method of the BLE tire pressure sensor according to claim 8, wherein, In step S4, the BLE master node filters and analyzes the received RSSI data and sorts it according to signal strength. The BLE master node calibrates the position of the tire where the BLE tire pressure sensor is located based on the position of the BLE positioning anchor on the vehicle body and the signal strength.

10. The calibration method of the BLE tire pressure sensor according to claim 9, characterized in that, It further includes step S6. The BLE master node sends the position of the tire where the BLE tire pressure sensor is located and the tire status information obtained thereby to the outside via the vehicle network according to the vehicle operating state.

11. The calibration method of the BLE tire pressure sensor according to claim 9, characterized in that, If a certain BLE tire pressure sensor is replaced, the BLE master node will find that there is no ID identifier of the BLE tire pressure sensor. Execute steps S4 and S5 to calibrate the BLE tire pressure sensor and save the ID identifier of the BLE tire pressure sensor and the position of the tire where it is located.

12. The calibration method of the BLE tire pressure sensor according to claim 9, wherein According to the diagnostic requirements of the vehicle network system, the BLE tire pressure sensor realizes OTA upgrade via the vehicle network.

13. The calibration method of the BLE tire pressure sensor according to claim 9, characterized in that, If the tire status information of the BLE tire pressure sensor obtained by the BLE master node is abnormal or cannot be collected, execute the steps: T1. Traverse all BLE positioning anchors. 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 starts scanning the Bluetooth broadcasts of the BLE tire pressure sensor. If the BLE positioning anchor establishes a connection with the BLE tire pressure sensor, the BLE positioning anchor sends its own ID identifier and the RSSI data of the scanned BLE tire pressure sensor to the BLE master node via the vehicle network. If the connection times out, it feeds back to the BLE master node and returns to step T1.

14. The calibration method of the BLE tire pressure sensor according to claim 9, characterized in that, 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 several of the BLE positioning anchors to receive the tire status information of the BLE tire pressure sensor according to the proximity principle. Then the BLE positioning anchor serves as a relay node of the BLE master node and is used to transmit the tire status information of the BLE tire pressure sensor to the BLE master node.

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