A tire pressure collecting method and system based on a bluetooth wireless sensor network

Abstract

The application discloses a tire pressure collection method and system based on a Bluetooth wireless sensor network, which comprises the following steps: a center device judges and filters a broadcast, acquires a wireless sensing terminal required by itself, and sends filtered data to a production device related to an OBD-II interface through a reserved interface; after the wireless sensing terminal required is acquired, the center device includes the wireless sensing terminal into a white list of itself, and automatically disconnects after next power-on; after connection binding is completed, the center device periodically scans data of the wireless sensing terminal, acquires a tire pressure value of an attribute table, and automatically receives notification data from the wireless sensing terminal outside the periodical scanning. The application saves wire materials and manpower consumed in a production process based on the problem of wiring required by tire pressure detection, and is also beneficial to vehicle maintenance in a later period. Meanwhile, the application saves certain electric power resources compared with wired communication or other wireless communication schemes.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a tire pressure acquisition method and system based on a Bluetooth wireless sensor network. Background Technology

[0002] Traditional automotive status or information collection, such as tire pressure, relies on a wired method. The ECU (Electronic Control Unit) that collects the data connects to the relevant domain controller via a CAN / LIN bus, ultimately sending the collected data to the vehicle's display interface and uploading it to the cloud via a T-BOX. It's evident that wired communication requires cables and manual wiring during production and manufacturing. Furthermore, during post-shipment maintenance, wired communication necessitates extensive vehicle disassembly, increasing maintenance costs compared to wireless methods. Additionally, wired communication requires a power source to maintain the entire communication link, incurring electricity costs. Summary of the Invention

[0003] The purpose of this invention is to provide a tire pressure acquisition method and system based on a Bluetooth wireless sensor network to overcome the shortcomings of the prior art.

[0004] This invention is implemented by the following technical solution: a tire pressure acquisition method based on a Bluetooth wireless sensor network, comprising the following steps:

[0005] Set the wireless sensor terminal to factory configuration mode, which includes broadcast mode or installation mode; set the central device to listening mode.

[0006] The central equipment judges and filters the broadcasts it is monitoring, obtains the wireless sensing terminals it needs, and sends the filtered data to the production equipment related to the OBD-II interface through the reserved interface.

[0007] After acquiring the required wireless sensor terminal, the central device adds the required wireless sensor terminal to its own whitelist and automatically connects to it the next time it is powered on.

[0008] The central device and the wireless sensor terminal establish a communication connection exchange, and the binding is successful after the connection exchange is completed.

[0009] After binding is completed, the central device periodically scans the data from the wireless sensor terminal to obtain the tire pressure value from the attribute table, and automatically receives notification data from the wireless sensor terminal outside of the periodic scanning period.

[0010] Furthermore, the broadcast mode of the central device will not exceed 30 seconds; if it exceeds 30 seconds, the device will automatically shut down.

[0011] Furthermore, the reading and writing of the memory of the central device is controlled only by the production equipment.

[0012] Furthermore, the central device is set to a listening mode, specifically by using dedicated production equipment to connect directly or indirectly to the communication interface of the central device via the vehicle's OBD-II interface. The protocol used by the production equipment includes, but is not limited to, setting the central device to a listening mode and deleting any already bound wireless sensor terminals.

[0013] Furthermore, the central device judges and filters the monitored broadcasts to obtain the wireless sensor terminals it needs. This includes: the central device performing relevant filtering based on the device's MAC address, transmitting the filtering result to a device connected to OBD-II that configures the central device, the production device having a built-in decryption key, parsing the encrypted data packet of the filtered MAC address, obtaining the SN number of the wireless sensor terminal, the production device calculating the SN number and MAC address, and if they match, the production device identifying the target wireless sensor terminal as a device it supports.

[0014] Furthermore, the cardiac device and the wireless sensor terminal establish a communication connection and exchange, specifically as follows:

[0015] The wireless sensor terminal broadcasts relevant information during the production and installation process. After receiving the information from the wireless sensor terminal, the central device confirms the data of the wireless sensor terminal and stores the MAC address of the bound wireless sensor terminal in the whitelist of the central device.

[0016] Furthermore, the wireless sensing terminal determines whether the central device is powered on based on the scanning time window of the central device, and ultimately decides the frequency of sending tire pressure data. The scanning time window of the central device is determined by whether the time of the previous scan and the current scan have exceeded the time limit.

[0017] Furthermore, when the central device is online, the wireless sensing terminal sends tire pressure data to the central device every 5 seconds; when the central device is offline, the wireless sensing terminal sends tire pressure data to the central device every 1 minute.

[0018] This invention also provides a tire pressure acquisition system based on a Bluetooth wireless sensor network, comprising: a wireless sensing terminal and a central device, wherein:

[0019] The wireless sensing terminal includes a first MCU module, a tire pressure sensor, a first BLE wireless module, and a reset button;

[0020] The central equipment includes a second MCU module, a reserved communication interface, a second BLE wireless module, and a vehicle start DI module;

[0021] The first BLE wireless module and the second BLE wireless module exchange communication connections to achieve communication connection binding between the wireless sensing terminal and the central device, and to collect tire pressure data. Specifically, the communication connection binding and tire pressure data collection are as follows:

[0022] Set the wireless sensor terminal to factory configuration mode, which includes broadcast mode or installation mode; set the central device to listening mode.

[0023] The central equipment judges and filters the broadcasts it is monitoring, obtains the wireless sensing terminals it needs, and sends the filtered data to the production equipment related to the OBD-II interface through the reserved interface.

[0024] After acquiring the required wireless sensor terminal, the central device adds the required wireless sensor terminal to its own whitelist and automatically connects to it the next time it is powered on.

[0025] The central device and the wireless sensor terminal establish a communication connection exchange, and the binding is successful after the connection exchange is completed.

[0026] After binding is completed, the central device periodically scans the data from the wireless sensor terminal to obtain the tire pressure value from the attribute table, and automatically receives notification data from the wireless sensor terminal outside of the periodic scanning period.

[0027] Both the first and second BLE wireless modules are powered by button batteries.

[0028] Advantages of this invention:

[0029] This invention, based on low-power Bluetooth wireless sensor technology, solves the problem of wiring required for tire pressure monitoring in actual production processes, saving on wiring and manpower during production, and also facilitating later vehicle maintenance. Furthermore, it saves on power resources compared to wired communication or other wireless communication solutions. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a block diagram illustrating the principle of a wireless sensing terminal in a tire pressure acquisition system based on a Bluetooth wireless sensor network, according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the central device of a tire pressure acquisition system based on a Bluetooth wireless sensor network, according to an embodiment of the present invention.

[0033] Figure 3 This is a flowchart of a tire pressure acquisition method based on a Bluetooth wireless sensor network according to an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This invention relates to a tire pressure monitoring system based on a Bluetooth wireless sensor network, mainly consisting of two parts. The first part is a wireless sensor terminal responsible for collecting tire pressure, such as... Figure 1 As shown; the other part is the central equipment responsible for collecting data from the terminal's wireless sensors, such as... Figure 2 As shown.

[0036] The wireless sensing terminal includes a first MCU module, a tire pressure sensor, a first BLE wireless module, and a reset button;

[0037] The central equipment includes a second MCU module, a reserved communication interface, a second BLE wireless module, and a vehicle start DI module;

[0038] The first BLE wireless module and the second BLE wireless module exchange communication connections to achieve communication connection binding and tire pressure data acquisition between the wireless sensing terminal and the central device. Specifically, the communication connection binding and tire pressure data acquisition are as follows:

[0039] Set the wireless sensor terminal to factory configuration mode, which includes broadcast mode or installation mode; set the central device to listening mode.

[0040] The central equipment judges and filters the broadcasts it is monitoring, obtains the wireless sensing terminals it needs, and sends the filtered data to the production equipment related to the OBD-II interface through the reserved interface.

[0041] After acquiring the required wireless sensor terminal, the central device will add the required wireless sensor terminal to its own whitelist and automatically connect to it the next time it is powered on.

[0042] The central device and the wireless sensor terminal establish a communication connection exchange, and the binding is successful after the connection exchange is completed.

[0043] After binding is completed, the central device periodically scans the data from the wireless sensor terminal to obtain the tire pressure value from the attribute table, and automatically receives notification data from the wireless sensor terminal outside of the periodic scanning period.

[0044] The first and second BLE wireless modules are powered by button batteries.

[0045] like Figure 3 As shown, the communication mechanism between the wireless sensing terminal and the central device is as follows:

[0046] 1. In production mode, first set the wireless sensor terminal to factory configuration mode (broadcast mode or installation mode). Press and hold the reset button on the wireless sensor terminal for 12 seconds to enter broadcast mode. The broadcast mode of the wireless sensor terminal shall not exceed 30 seconds. If this time is exceeded, the wireless sensor terminal will automatically shut down. In addition, the storage used by the wireless sensor terminal is a one-time device (stored in ROM). Once the device is successfully bound, it can only communicate with the corresponding central device and cannot be erased or modified.

[0047] 2. Set the central device to listening mode using the defined protocol through the central device's communication interface.

[0048] This process uses dedicated production equipment and connects directly or indirectly to the communication interface of the central device via the vehicle's OBD-II interface. The protocols used include, but are not limited to, setting the central device to eavesdropping and deleting the already bound wireless sensor terminals.

[0049] 3. The central equipment judges and filters the broadcasts it is monitoring, selects the wireless sensing terminals it needs instead of other unnecessary terminals, and sends the filtered data to the production equipment related to the OBD-II interface through the reserved interface.

[0050] How does the central device identify its own wireless sensor terminals from those of others? Step 1: The central device performs filtering based on the device's MAC address. Step 2: The filtered result is transmitted to the OBD-II connection device. This device, with its built-in decryption key, parses the encrypted data packet of the filtered MAC address to obtain the target device's serial number (SN). The OBD-II interface device calculates the SN and MAC address; if they match, the device identifies the target wireless sensor terminal as a supported device. This involves a cryptographic method: using the built-in key, a random MAC address is calculated to obtain the SN, which is the essence of the device's identification of the wireless sensor terminal as its own, rather than someone else's.

[0051] 4. The central device will add the wireless sensor terminal to its whitelist and automatically connect to it the next time it is powered on.

[0052] 5. The wireless sensor terminal and the central device are successfully bound. The wireless sensor terminal broadcasts necessary information during production and installation. After receiving the information from the wireless sensor terminal, the central device confirms the data and stores the MAC address of the bound device in the central device's whitelist for subsequent automatic connection.

[0053] 6. During normal vehicle use, the vehicle needs to send a DO signal to the central device upon power-up. The central device receives the relevant signal and communication instructions upon receiving the DI signal, enabling it to start working and quickly establish a connection with the wireless sensor terminal. When the wireless sensor terminal malfunctions and needs replacement, the replacement procedure follows the factory-bonded steps.

[0054] 7. Data Acquisition and Transmission. The MCU of the wireless sensor terminal filters the acquired sensor data, calculates the final data information, and stores it in the Bluetooth attribute table in a specific format. After powering on, the central device periodically (for extended periods, like a heartbeat) scans the data from the wireless sensor terminal to obtain the tire pressure value from the attribute table. At other times, it automatically receives notifications from the wireless sensor terminal (containing tire pressure sensor data). The wireless sensor terminal determines whether the central device is powered on based on the scanning time window (whether the time of the previous scan exceeds the time of the current scan), ultimately deciding the acquisition frequency to reduce power consumption. For example, when the central device is online, the wireless sensor terminal sends tire pressure data to the central device every 5 seconds. When the central device is offline, the wireless sensor terminal sends tire pressure data to the central device every 1 minute.

[0055] In summary, this invention, based on low-power Bluetooth wireless sensor technology, solves the problem of wiring required for tire pressure monitoring in actual production processes, saving on wiring and manpower during production, and also facilitating later vehicle maintenance. Furthermore, it saves on power resources compared to wired communication or other wireless communication solutions.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tire pressure acquisition method based on a Bluetooth wireless sensor network, characterized in that, Includes the following steps: Set the wireless sensor terminal to factory configuration mode, which includes broadcast mode; set the central device to listening mode, specifically: use dedicated production equipment to connect directly or indirectly to the reserved communication interface of the central device through the vehicle's OBD-II interface, and the protocol used by the production equipment includes setting the central device to listening mode and deleting the already bound wireless sensor terminal. The central device judges and filters the broadcasts it is monitoring, and sends the filtered data to the production equipment related to the OBD-II interface through a reserved communication interface to obtain the wireless sensor terminal it needs. This process includes: the central device performing filtering based on the device's MAC address, transmitting the filtering result to the production equipment connected to the OBD-II interface that configures the central device, the production equipment using a built-in decryption key, parsing the encrypted data packet of the filtered MAC address to obtain the serial number (SN) of the wireless sensor terminal, and the production equipment calculating the SN and MAC address. If they match, the production equipment identifies the target wireless sensor terminal as a supported device. After acquiring the required wireless sensing terminal, the central device adds the required wireless sensing terminal to its own whitelist and automatically connects to it the next time it is powered on. The central device and the wireless sensing terminal exchange communication connections, and the binding is successful after the connection exchange is completed. After binding is completed, the central device periodically scans the data of the wireless sensor terminal to obtain the tire pressure value in the attribute table, and automatically receives notification data from the wireless sensor terminal outside of the periodic scanning time.

2. The tire pressure acquisition method based on a Bluetooth wireless sensor network according to claim 1, characterized in that, The broadcast mode of the wireless sensing terminal shall not exceed 30 seconds. If the broadcast exceeds 30 seconds, the wireless sensing terminal will automatically shut down.

3. The tire pressure acquisition method based on a Bluetooth wireless sensor network according to claim 1, characterized in that, The reading and writing of the memory of the central device are controlled only by the production equipment.

4. The tire pressure acquisition method based on a Bluetooth wireless sensor network according to claim 1, characterized in that, The wireless sensing terminal determines whether the central device is powered on based on the scanning time window of the central device, and ultimately decides the frequency of sending tire pressure data.

5. The tire pressure acquisition method based on a Bluetooth wireless sensor network according to claim 4, characterized in that, When the central device is online, the wireless sensor terminal sends tire pressure data to the central device every 5 seconds; when the central device is offline, the wireless sensor terminal sends tire pressure data to the central device every 1 minute.

6. A tire pressure acquisition system based on a Bluetooth wireless sensor network, employing the tire pressure acquisition method as described in claim 1, characterized in that, include: Wireless sensing terminals and central equipment, including: The wireless sensing terminal includes a first MCU module, a tire pressure sensor, a first BLE wireless module, and a reset button; The central equipment includes a second MCU module, a reserved communication interface, a second BLE wireless module, and a vehicle start DI module; The first BLE wireless module and the second BLE wireless module exchange communication connections to achieve communication connection binding between the wireless sensing terminal and the central device, and to collect tire pressure data. Specifically, the communication connection binding and tire pressure data collection are as follows: Set the wireless sensor terminal to factory configuration mode, which includes broadcast mode; set the central device to listening mode; The central equipment judges and filters the broadcasts it is monitoring, and sends the filtered data to the production equipment related to the OBD-II interface through the reserved communication interface to obtain the wireless sensing terminal it needs. After acquiring the required wireless sensing terminal, the central device adds the required wireless sensing terminal to its own whitelist and automatically connects to it the next time it is powered on. The central device and the wireless sensing terminal exchange communication connections, and the binding is successful after the connection exchange is completed. After binding is completed, the central device periodically scans the data of the wireless sensor terminal to obtain the tire pressure value in the attribute table, and automatically receives notification data from the wireless sensor terminal outside of the periodic scanning time.

7. A tire pressure acquisition system based on a Bluetooth wireless sensor network according to claim 6, characterized in that, The first and second BLE wireless modules are powered by button batteries.

Images