Low frequency wake-up communication method and system for bluetooth smart tire pressure sensor

Abstract

The application provides a low-frequency wake-up communication method and system of a Bluetooth smart tire pressure sensor, and relates to the technical field of wireless communication.The method comprises the following steps: a Bluetooth smart tire pressure sensor receives a low-frequency trigger signal through a low-frequency module unit; the low-frequency trigger signal is decoded by an integrated chip unit, and the Bluetooth smart tire pressure sensor is controlled to switch from a low-power standby mode to a working mode according to the signal decoding result; in the working mode, real-time collection of tire state parameters is performed to identify an edge state, and a localized tire state identification result is generated; and the Bluetooth antenna module unit is used to send the tire state identification result to a target device in a Bluetooth communication mode.The application solves the technical problem of data transmission redundancy in the prior art, because the Bluetooth tire pressure sensor directly sends original collected data after low-frequency wake-up, and ensures accurate data transmission and improves the reliability of the Bluetooth smart tire pressure sensor through a low-frequency wake-up mechanism and edge state identification.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, specifically to a low-frequency wake-up communication method and system for Bluetooth smart tire pressure sensors. Background Technology

[0002] Existing original equipment tire pressure sensors mostly use a radio frequency one-way communication solution, requiring a dedicated radio frequency receiver and complex wiring harness to be installed in the vehicle body. This not only increases the overall material cost and weight of the vehicle but also poses a serious risk of co-channel interference. Another option is a low-frequency wake-up Bluetooth tire pressure sensor, which wakes up the sensor on demand via a low-frequency transmitter in the vehicle body, and then the sensor sends the collected raw data to the receiver via Bluetooth. However, after being woken up, the sensor only performs data acquisition and raw value transmission. The determination of tire status depends entirely on the receiver, which requires the transmission of complete raw pressure and temperature data packets for each wake-up. This results in long transmission times and high power consumption. At the same time, the receiver needs to perform real-time threshold comparison and status calculation on raw data from multiple tires, which significantly increases the processing burden, especially in multi-sensor concurrent scenarios.

[0003] In summary, existing technologies suffer from technical problems such as data transmission redundancy and high power consumption of Bluetooth smart tire pressure sensors, which are caused by Bluetooth tire pressure sensors directly sending the raw collected data after low-frequency wake-up. Summary of the Invention

[0004] The purpose of this application is to provide a low-frequency wake-up communication method and system for Bluetooth smart tire pressure sensors, in order to solve the technical problems in the prior art where Bluetooth tire pressure sensors only send the original collected data directly after low-frequency wake-up, resulting in data transmission redundancy and high power consumption of Bluetooth smart tire pressure sensors.

[0005] To achieve the above objectives, this application provides a low-frequency wake-up communication method and system for a Bluetooth smart tire pressure sensor.

[0006] In a first aspect, this application provides a low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor. This method is implemented through a Bluetooth smart tire pressure sensor low-frequency wake-up communication system. The method includes: the Bluetooth smart tire pressure sensor comprising a low-frequency module unit, an integrated chip unit, and a Bluetooth antenna module unit; the Bluetooth smart tire pressure sensor receiving a low-frequency trigger signal sent by an external device through the low-frequency module unit; the integrated chip unit decoding the low-frequency trigger signal and controlling the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode based on the decoding result; in the working mode, the integrated chip unit controlling the smart sensing module to collect tire state parameters in real time and performing edge state recognition based on the tire state parameters to generate a localized tire state recognition result; and the integrated chip unit transmitting the tire state recognition result to a target device via Bluetooth communication through the Bluetooth antenna module unit.

[0007] Optionally, the integrated chip unit demodulates the low-frequency trigger signal and extracts instruction encoding information; based on a preset instruction mapping relationship, it parses the instruction encoding information and generates a corresponding signal decoding instruction, which includes the type of operation to be performed; according to the signal decoding instruction, it sends a mode switching control signal to the power management circuit and functional unit circuit of the Bluetooth smart tire pressure sensor, so that the Bluetooth smart tire pressure sensor responds to the mode switching control signal and switches from low-power standby mode to working mode.

[0008] Optionally, the signal decoding instruction includes at least one of the following operation types: immediate reporting, delayed reporting, and self-test. If the signal decoding instruction is an immediate reporting instruction, the Bluetooth smart tire pressure sensor immediately performs tire status parameter acquisition after entering the working mode. If the signal decoding instruction is a delayed reporting instruction, the integrated chip unit starts an internal timer after entering the working mode, and performs tire status parameter acquisition only after the timer reaches a preset delay time. If the signal decoding instruction is a self-test instruction, the integrated chip unit performs battery voltage and chip operating status detection after entering the working mode, and generates self-test status information as part of the tire status identification result.

[0009] Optionally, in the operating mode, the integrated chip unit sends a data acquisition command to the intelligent sensing module; the intelligent sensing module responds to the data acquisition command by simultaneously acquiring the current pressure data and current temperature data of the tire, and sends the current pressure data and current temperature data as tire status parameters to the integrated chip unit; the integrated chip unit compares the received current pressure data and current temperature data with preset pressure thresholds and preset temperature thresholds respectively, and determines the tire status based on the comparison results, generating a tire status identification result, wherein the tire status identification result is associated with a tire status classification label.

[0010] Optionally, when the tire condition classification label indicates an abnormal tire condition, the integrated chip unit generates an anomaly monitoring instruction; based on the anomaly monitoring instruction, the Bluetooth antenna module unit is controlled to increase the transmission power or shorten the transmission interval to send the tire condition identification result at a higher frequency.

[0011] Optionally, the integrated chip unit combines and encapsulates the tire status recognition result, the unique identification information of the Bluetooth smart tire pressure sensor, and the data generation time point into a transmission data packet; the integrated chip unit calls the driver of the Bluetooth antenna module unit to frame the transmission data packet according to a predetermined Bluetooth communication protocol format to generate a Bluetooth data frame; and controls the Bluetooth antenna module unit to send the Bluetooth data frame to the target device.

[0012] Optionally, the external device is a low-frequency triggering device of a digital key system or a mobile smart terminal with low-frequency communication function; the target device is a digital key control module or a mobile smart terminal of a vehicle.

[0013] Secondly, this application also provides a low-frequency wake-up communication system for a Bluetooth smart tire pressure sensor, used to execute the low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in the first aspect, wherein the low-frequency wake-up communication system for the Bluetooth smart tire pressure sensor includes: a signal receiving module, used for the Bluetooth smart tire pressure sensor to receive a low-frequency trigger signal sent by an external device through the low-frequency module unit; a signal decoding module, used for the integrated chip unit to decode the low-frequency trigger signal, and to control the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode according to the signal decoding result; an edge state recognition module, used for the integrated chip unit to control the smart sensing module to collect tire state parameters in real time in the working mode, and to perform edge state recognition based on the tire state parameters to generate a localized tire state recognition result; and a data transmission module, used for the integrated chip unit to send the tire state recognition result to a target device through the Bluetooth antenna module unit in a Bluetooth communication manner.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages: The Bluetooth smart tire pressure sensor includes a low-frequency module unit, an integrated chip unit, and a Bluetooth antenna module unit. The Bluetooth smart tire pressure sensor receives low-frequency trigger signals sent by external devices through the low-frequency module unit. The integrated chip unit decodes the low-frequency trigger signals and controls the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode based on the decoding result. In the working mode, the integrated chip unit controls the smart sensing module to collect tire status parameters in real time and performs edge state recognition based on these parameters to generate localized tire status recognition results. The integrated chip unit then transmits the tire status recognition results to the target device via Bluetooth communication through the Bluetooth antenna module unit. In other words, by integrating edge state recognition functionality at the sensor end, and generating localized tire status recognition results with classification tags based on the collected tire status parameters, the amount of Bluetooth data transmitted is reduced, the processing load at the receiving end is lowered, and the autonomy and timeliness of anomaly detection and reporting are improved, thereby enhancing the reliability and stability of the Bluetooth smart tire pressure sensor.

[0015] The above description is merely an overview of the technical solution of this application. To better understand the technical means of this application and to facilitate its implementation according to the description, and to make the above and other objects, features, and advantages of this application more apparent, specific embodiments of this application are described below. It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent through the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application 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 merely exemplary. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the low-frequency wake-up communication method of the Bluetooth smart tire pressure sensor of this application.

[0018] Figure 2 This is a schematic diagram of the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor of this application.

[0019] Explanation of reference numerals in the attached diagram: Signal receiving module 11, signal decoding module 12, edge state recognition module 13, data transmission module 14. Detailed Implementation

[0020] This application provides a low-frequency wake-up communication method and system for Bluetooth smart tire pressure sensors, solving the technical problems in existing technologies where Bluetooth tire pressure sensors only send the raw collected data directly after low-frequency wake-up, leading to data transmission redundancy and high power consumption. By integrating edge state recognition functionality at the sensor end, localized tire state recognition results with classification labels are generated based on the collected tire state parameters. This reduces the amount of Bluetooth data transmitted, lowers the processing load on the receiving end, improves the autonomy and timeliness of anomaly detection and reporting, and enhances the reliability and stability of the Bluetooth smart tire pressure sensor.

[0021] The technical solutions of this application will now be clearly and completely described 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. It should be understood that this application is not limited to the exemplary embodiments described herein. 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. It should also be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all of them.

[0022] Example 1, please refer to the appendix. Figure 1 This application provides a low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor. The method is applied to a low-frequency wake-up communication system for the Bluetooth smart tire pressure sensor and specifically includes the following steps: S100: The Bluetooth smart tire pressure sensor includes a low-frequency module unit, an integrated chip unit, and a Bluetooth antenna module unit. The Bluetooth smart tire pressure sensor receives low-frequency trigger signals sent by external devices through the low-frequency module unit.

[0023] Specifically, the Bluetooth smart tire pressure sensor is programmed with a unique identifier and preset operating parameters at the factory. When the vehicle is not running or tire pressure monitoring is not required, the Bluetooth smart tire pressure sensor enters a low-power standby mode. In this mode, only the low-frequency module unit is powered, while most functional modules and smart sensing modules in the integrated chip unit are powered off or in a clock-gated state, with the overall static current controlled below 1 microamp. The Bluetooth smart tire pressure sensor includes a low-frequency module unit, an integrated chip unit, a Bluetooth antenna module unit, a battery module unit, and a crystal oscillator module unit. The integrated chip unit is used to collect data such as temperature, pressure, and battery voltage during different operating modes of the Bluetooth smart tire pressure sensor. The low-frequency module unit performs low-frequency wake-up and related data communication with triggering devices or smart devices. The sensors inside the integrated chip unit collect and process tire temperature and pressure data. The Bluetooth antenna module unit outputs processed information to smart devices (not limited to smartphones / smartwatches / smartbands) to achieve Bluetooth communication or digital security modules. The battery module unit provides power input to the integrated chip unit and other units. The crystal oscillator module provides a fixed-period crystal oscillation source for the integrated chip unit. The low-frequency module provides a low-frequency trigger wake-up and low-frequency signal communication interface for data transmission of the Bluetooth smart tire pressure sensor. The Bluetooth antenna module is used for transmitting and receiving data from the Bluetooth smart tire pressure sensor.

[0024] When tire status needs to be read, an external device generates a 125kHz sinusoidal carrier wave and modulates a pre-programmed digital command sequence onto this carrier wave using amplitude shift keying (APS-K). A low-frequency trigger signal is transmitted to the sensor location via spatial magnetic field coupling. Inside the sensor, the inductor in the low-frequency module induces a weak voltage proportional to the rate of change of the magnetic field. This voltage is rectified, filtered, and amplified internally before being sent to a comparator. When the induced voltage amplitude exceeds a set detection threshold, the low-frequency module determines that a valid low-frequency carrier wave has been received and initiates the demodulation circuit to extract the digital encoded sequence from the carrier wave. The low-frequency module then transmits the demodulated raw bitstream to the integrated chip unit.

[0025] After receiving the bitstream, the integrated chip unit decodes it according to preset encoding rules to recover the instruction byte sequence. The integrated chip unit extracts the target sensor identifier field from the instruction and compares it with its own stored unique identifier. If they do not match, the integrated chip unit ignores the instruction, does not perform any mode switching operation, and the sensor continues to maintain low-power standby mode. If the identifiers match, the operation type code is further parsed, such as requiring immediate reporting, delayed reporting, or performing a self-test. After confirming the instruction is valid, the integrated chip unit sends an enable signal to the on-chip power management circuit, gradually activating the internal clock oscillator, reference voltage source, analog-to-digital converter, Bluetooth baseband, and RF circuitry, while simultaneously providing operating voltage to the smart sensing module, thereby switching the entire sensor from low-power standby mode to full-function operating mode. The typical time window for the switching process is 1ms to 5ms, depending on the chip's startup characteristics.

[0026] S200: The integrated chip unit decodes the low-frequency trigger signal and controls the Bluetooth smart tire pressure sensor to switch from low-power standby mode to working mode based on the signal decoding result.

[0027] Furthermore, S200 of this application includes: demodulating the low-frequency trigger signal by the integrated chip unit and extracting instruction encoding information; parsing the instruction encoding information based on a preset instruction mapping relationship and generating a corresponding signal decoding instruction, wherein the signal decoding instruction contains the operation type to be executed; and sending a mode switching control signal to the power management circuit and functional unit circuit of the Bluetooth smart tire pressure sensor according to the signal decoding instruction, so that the Bluetooth smart tire pressure sensor responds to the mode switching control signal and switches from a low-power standby mode to a working mode.

[0028] Furthermore, this application also includes the following steps: the operation type included in the signal decoding instruction includes at least one of immediate reporting, delayed reporting, and self-test; if the signal decoding instruction is an immediate reporting instruction, the Bluetooth smart tire pressure sensor immediately performs tire status parameter acquisition after entering the working mode; if the signal decoding instruction is a delayed reporting instruction, the integrated chip unit starts an internal timer after entering the working mode, and performs tire status parameter acquisition only after the timer reaches a preset delay time; if the signal decoding instruction is a self-test instruction, the integrated chip unit performs battery voltage and chip operating status detection after entering the working mode, and generates self-test status information as part of the tire status identification result.

[0029] Specifically, after receiving the demodulated binary bitstream from the low-frequency module unit, the integrated chip unit performs frame synchronization processing. The digital logic within the integrated chip unit continuously monitors the bitstream for a predetermined preamble end marker. Upon detecting this marker, the integrated chip unit begins receiving subsequent data byte-by-byte according to the frame format until the complete frame length is received. After reception, the integrated chip unit uses cyclic redundancy check (CRC) to verify the correctness of the received data frame. If the check passes, the integrated chip unit extracts the opcode byte from the fixed offset position of the frame; if the check fails, the frame is discarded without any mode switching.

[0030] The instruction encoding information is a demodulated binary bit sequence organized according to a predefined frame format. It typically includes a preamble, start-of-frame flag, sensor identifier field, opcode field, parameter field, and checksum field. The opcode field is the core content, specifying the specific task to be performed after the sensor is activated. The instruction encoding information is the raw digital signal, not yet given semantic meaning, and requires further parsing to be converted into executable instructions.

[0031] The integrated chip unit uses the opcode byte as an index to access the internally stored instruction mapping table. The instruction mapping table is typically implemented as a lookup table, where each possible opcode value corresponds to a predefined function entry address or task descriptor. The integrated chip unit compares the opcode value sequentially with the entries in the table. If a match is found, a corresponding signal decoding instruction object is generated, containing an operation type field and possible parameter fields. The preset instruction mapping relationship is a fixed correspondence table or logical rule stored in the integrated chip unit's internal non-volatile memory, defining the correspondence between each binary opcode and a specific operation. For example, binary code 00000001 corresponds to immediate reporting, 00000010 corresponds to delayed reporting, and 00000011 corresponds to self-test. Unlike the original binary instruction encoding information, the signal decoding instruction is already a machine instruction or function call parameter that the chip's central processing unit can understand, containing a clear operation type and necessary additional parameters.

[0032] Before executing signal decoding commands, the integrated chip unit switches the sensor from low-power standby mode to operating mode, as most functional units are currently powered down. Based on the command type and predefined power management strategies, the integrated chip unit generates a series of mode-switching control signals. For immediate reporting commands, the integrated chip unit sends an enable signal to the power management circuitry, requesting the rapid activation of all necessary functional units, including the sensor module, Bluetooth RF, and crystal oscillator. For delayed reporting commands, the integrated chip unit first starts a low-power timer, then sends a partial enable signal to the power management circuitry, and finally sends the complete mode-switching signal after the timer reaches its delay. For self-test commands, the integrated chip unit only needs to activate the units related to the self-test; it does not need to activate the Bluetooth RF unless a self-test result is requested.

[0033] The integrated chip unit is connected to the various enable terminals of the power management circuit via general-purpose input / output pins. For example, pin P1 connects to the power switch of the sensor module, pin P2 connects to the power switch of the Bluetooth RF circuit, and pin P3 connects to the enable terminal of the crystal oscillator circuit. When the integrated chip unit needs to switch modes, it sequentially sets the corresponding pins to a high level and maintains sufficient stabilization time, such as waiting 1ms for the crystal oscillator to start oscillating and 2ms for the RF circuit to initialize. After detecting the pin level change, the power management circuit closes the corresponding electronic switch, supplying the battery voltage to the corresponding functional unit. After each functional unit is powered on, it sequentially completes reset and initialization, entering a standby state. When all necessary functional units are ready, the integrated chip unit confirms that the sensor has fully entered the working mode and then begins to execute the specific operations in the signal decoding instructions, such as data acquisition, reporting, or self-testing.

[0034] The signal decoding command includes at least one of the following operation types: immediate reporting, delayed reporting, and self-testing. Immediate reporting requires the sensor to immediately initiate the tire status parameter acquisition process without any waiting after switching from low-power standby mode to operating mode, and then transmit the acquired data via Bluetooth. Delayed reporting typically includes an additional delay time parameter, meaning that after entering operating mode, data acquisition is not performed immediately; instead, an internal timer is started, and data acquisition and reporting are triggered only after a preset delay time has elapsed. The self-test command requires the sensor to not acquire tire pressure and temperature data after entering operating mode, but instead to check the sensor's own hardware health.

[0035] If the signal decoding command is an immediate reporting command, the integrated chip unit, after confirming that all necessary functional units are powered on and stable, immediately sends a data acquisition start command to the intelligent sensing module via the internal bus. This triggers the sensing module to excite the pressure sensor and read the temperature sensor. After the physical quantity conversion is complete, the integrated chip unit reads the pressure and temperature values ​​from the sensor module's output register. Upon completion of the reading, the integrated chip unit then performs edge state recognition, generates a tire state recognition result, and calls the Bluetooth transmission procedure to send the result out. No artificial waiting delays are inserted throughout the entire process.

[0036] If the signal decoding command is a delayed reporting command, the integrated chip unit will not immediately send a data acquisition command to the sensor module after entering the working mode. Instead, it will first extract the value of the preset delay time from the command, such as 500ms. The integrated chip unit configures the initial count and comparison value of its internal timer, causing the timer to generate an interrupt after the delay time. To save power, the integrated chip unit can choose to temporarily keep the sensor module and Bluetooth RF in a power-off state, maintaining only the minimum system clock required by the timer. The timer starts counting down, and the sensor is in a quasi-standby state, with power consumption far lower than in full working mode. When the timer count reaches the preset value, the timer hardware sends an interrupt signal to the integrated chip unit. After responding to the interrupt, the integrated chip unit will then enable the sensor module and Bluetooth RF in sequence, and then execute the same data acquisition, identification, and transmission process as immediate reporting.

[0037] If the signal decoding command is a self-test command, the integrated chip unit, after entering the working mode, will skip the acquisition command of the intelligent sensing module and instead execute a series of internal diagnostic procedures. The analog-to-digital converter inside the integrated chip unit switches to the battery voltage detection channel, samples the battery voltage multiple times, and averages the results to obtain the voltage value. Simultaneously, the temperature sensor inside the integrated chip unit outputs a voltage corresponding to the chip junction temperature, which is converted to a Celsius value after analog-to-digital conversion. The integrated chip unit performs cyclic redundancy check calculations on critical areas of the program memory and compares the calculation results with the values ​​pre-stored at the factory. The integrated chip unit checks whether the low-frequency receiving path is normal, such as by reading the register status of the low-frequency module unit and whether the Bluetooth RF phase-locked loop is locked. After all tests are completed, the integrated chip unit packages this information into self-test status information. This information does not replace tire status parameters but is part of the tire status identification result, such as adding a self-test status field to the normally reported pressure and temperature data. If the self-test detects an anomaly, such as a low battery voltage, the integrated chip unit can mark the anomaly as high priority and report it promptly via Bluetooth to prompt the user for maintenance.

[0038] By subdividing low-frequency wake-up commands into three operation types—immediate reporting, delayed reporting, and self-testing—and specifying differentiated behaviors of sensors after entering operating mode for each, external devices can autonomously select the command type based on the current scenario. Immediate reporting is used when rapid acquisition of current tire pressure is required; delayed reporting is used when the vehicle has just started, the tires are still unstable, or off-peak transmission is needed; and self-testing is used when a sensor malfunction is suspected.

[0039] S300: In the operating mode, the integrated chip unit controls the intelligent sensing module to collect tire status parameters in real time, and performs edge status recognition based on the tire status parameters to generate localized tire status recognition results.

[0040] Furthermore, in the working mode, S300 of this application includes: the integrated chip unit sending a collection command to the intelligent sensing module; the intelligent sensing module responding to the collection command, synchronously collecting the current pressure data and current temperature data of the tire, and sending the current pressure data and current temperature data as tire state parameters to the integrated chip unit; the integrated chip unit comparing the received current pressure data and current temperature data with preset pressure thresholds and preset temperature thresholds respectively, and judging the tire state according to the comparison result, generating a tire state identification result, wherein the tire state identification result is associated with a tire state classification label.

[0041] Furthermore, this application also includes the following steps: when the tire condition classification label indicates an abnormal tire condition, the integrated chip unit generates an abnormality monitoring instruction; based on the abnormality monitoring instruction, the Bluetooth antenna module unit is controlled to increase the transmission power or shorten the transmission interval to send the tire condition identification result at a higher frequency.

[0042] Specifically, after completing the mode switch and confirming that the Bluetooth smart tire pressure sensor is in working mode, the integrated chip unit sends a data acquisition command to the smart sensing module via its internal integrated circuit bus or serial peripheral interface. The data acquisition command is a specific digital command code sent by the integrated chip unit to the smart sensing module via its internal bus. The smart sensing module is a miniaturized, low-power pressure and temperature composite sensing chip integrated within the sensor, including a pressure-sensitive element, a temperature-sensitive element, an analog front-end amplifier, an analog-to-digital converter, and a digital interface.

[0043] Upon receiving a data acquisition command, the intelligent sensing module immediately triggers its internal state machine, simultaneously energizing the pressure-sensitive resistor bridge and the temperature-sensitive diode. After the energization stabilizes, the analog-to-digital converter inside the intelligent sensing module synchronously samples and converts the analog voltages of the pressure and temperature channels. The conversion process requires a fixed time, such as 4ms. After conversion, the sensing module stores the pressure and temperature values ​​in fixed locations in its output registers and indicates to the integrated chip unit that the data is ready via an interrupt pin or a ready flag in the status register. Upon detecting this indication, the integrated chip unit reads the values ​​from the two registers via the bus to obtain the current pressure and temperature data, which are used as tire status parameters.

[0044] The integrated chip unit reads pre-programmed pressure and temperature thresholds from its internal flash memory, including minimum pressure threshold, maximum pressure threshold, and maximum allowable temperature. It compares the current pressure value with these threshold ranges: if it's less than the minimum pressure threshold, it's considered underpressure; if not, it compares it with the maximum pressure threshold; if so, it's considered overpressure; if neither is true, the pressure is considered normal. Simultaneously, the integrated chip unit compares the current temperature value with the temperature threshold: if it's greater, it's considered high temperature; otherwise, the temperature is normal. Based on the pressure and temperature comparisons, the integrated chip unit generates a comprehensive tire condition identification result, including the original pressure value, the original temperature value, and a combined condition classification label. The classification label can be encoded using bit mapping, such as the least significant bit indicating underpressure, the second least significant bit indicating overpressure, and the third least significant bit indicating excessive temperature.

[0045] The integrated chip unit checks the classification label of the tire condition recognition result. If all the abnormal bits of the label are zero, it means that the tire condition is normal. In this case, the integrated chip unit will not generate any special instructions, and the Bluetooth antenna module unit will send out the tire condition recognition result according to the default transmission parameters. After the transmission is completed, the sensor returns to low-power standby mode.

[0046] If any abnormal bit in the classification tag is set, such as undervoltage, overvoltage, or high temperature flags being set to 1, the integrated chip unit immediately generates an anomaly monitoring command internally. This anomaly monitoring command is a software-triggered event. First, it modifies the transmit power configuration field in the Bluetooth control register, increasing the power value from the default 0 dBmW to a preset high power value, such as 4 dBmW. The anomaly monitoring command then modifies the repeat count and interval parameters of the transmit scheduler, changing the original single transmission to multiple repeated transmissions and shortening the interval between each transmission. Increasing the transmit power increases the output amplitude of the Bluetooth RF front-end power amplifier; shortening the transmission interval temporarily reduces the time interval between two Bluetooth transmissions. For example, it might be set to transmit every 2 seconds for 5 consecutive transmissions; or, depending on the severity of the anomaly, to transmit every 1 second until acknowledgment is received from the receiver or a timeout occurs. After completing these register modifications, the integrated chip unit calls the transmit function of the Bluetooth protocol stack, packages the tire status identification results into Bluetooth broadcast packets or data packets according to the new enhanced parameters, and transmits them sequentially through the Bluetooth antenna module unit.

[0047] If the sensor is woken up again while the abnormal state persists, the integrated chip unit continues to maintain the enhanced transmission strategy. Once the abnormal state disappears, the integrated chip unit will detect that the classification tag has returned to normal in subsequent wake-up cycles. At this point, it automatically clears the abnormal monitoring command and restores the Bluetooth transmission power and interval to their default values ​​to conserve battery power.

[0048] After detecting abnormal tire conditions locally, the sensor can autonomously change its communication strategy immediately without waiting for further instructions from external devices, reducing the response time for abnormal alarms from several seconds or even longer in traditional solutions to milliseconds. By increasing transmission power, the Bluetooth signal's ability to penetrate tires, rims, and obstacles under the vehicle is significantly enhanced. The data transmission rate is 1 Mbit / s, more than five times faster than wireless tire pressure sensors.

[0049] S400: The integrated chip unit transmits the tire status recognition result to the target device via Bluetooth communication through the Bluetooth antenna module unit.

[0050] Furthermore, S400 of this application includes: the integrated chip unit combining and encapsulating the tire state recognition result, the unique identification information of the Bluetooth smart tire pressure sensor, and the data generation time point into a transmission data packet; the integrated chip unit calling the driver of the Bluetooth antenna module unit to frame the transmission data packet according to a predetermined Bluetooth communication protocol format to generate a Bluetooth data frame; and controlling the Bluetooth antenna module unit to send the Bluetooth data frame to the target device.

[0051] Specifically, the integrated chip unit reads the pre-programmed unique identification information from its internal memory. Simultaneously, it reads the current count value from its internal real-time clock or high-precision timer as the data generation time point. This time point is typically the absolute timestamp of the sensor's completion of data acquisition after wake-up. The integrated chip unit allocates a transmission buffer in memory and sequentially writes the frame header, the sensor's unique identification information, the tire status recognition result, the data generation time point, and the checksum byte at the end of the frame according to a predefined data packet format, forming a complete transmission data packet.

[0052] The integrated chip unit needs to convert the transmitted data packets into Bluetooth data frames that conform to the Bluetooth Low Energy protocol specification. The integrated chip unit calls the driver initialization function of the Bluetooth antenna module unit to ensure the Bluetooth baseband is in an idle state and that transmission parameters, such as the operating channel and transmission power, are configured. The driver layer requires the integrated chip unit to write the transmitted data packets into the Bluetooth protocol stack's transmit queue. The protocol stack automatically assembles the frames according to the requirements of the Bluetooth link layer, adding a 1-byte preamble, a 4-byte access address, a 2-byte protocol data unit header, and then filling the protocol data unit with the transmitted data packets as payload. Finally, a 3-byte cyclic redundancy check value is appended. In broadcast mode, the Bluetooth data frame will also include optional header fields to indicate the send address type, etc. The length of the complete framed Bluetooth data frame is typically several tens of bytes. The integrated chip unit does not need to construct these frames bit by bit; instead, it does so automatically through the underlying hardware link controller by calling the protocol stack application programming interface.

[0053] After framing is complete, the integrated chip unit sends a start transmission command to the Bluetooth baseband. The Bluetooth baseband begins operation according to the specified parameters. The RF phase-locked loop locks to the target channel frequency, such as 2402MHz on broadcast channel 37. The baseband performs Gaussian frequency shift keying modulation on the Bluetooth data frame at a rate of 1Mbt / s, converting the digital signal into an analog baseband signal. The RF upconverter shifts the baseband signal to a 2.4GHz carrier, amplifies it through a power amplifier, and feeds it to the Bluetooth antenna module unit. The antenna converts the RF current into electromagnetic waves and radiates them into space. After transmission is complete, the Bluetooth baseband generates a transmission completion interrupt to notify the integrated chip unit that the transmission has ended. If a collision or failure occurs during transmission, the baseband will automatically retry, or in broadcast mode, it will not retry but will only notify of the failure. The integrated chip unit can decide whether to retransmit as needed. After transmission is complete, the sensor can immediately return to low-power standby mode or wait for the next instruction before going into sleep mode.

[0054] Furthermore, this application also includes the following steps: the external device is a low-frequency triggering device of a digital key system or a mobile smart terminal with low-frequency communication function; the target device is a digital key control module or a mobile smart terminal of a vehicle.

[0055] Specifically, the system identifies the type of the currently connected external device. If it is a low-frequency trigger device of the digital key system, the integrated chip unit, upon receiving a wake-up signal, matches the parsed vehicle identity information with the internally stored binding information. After confirming legitimacy, a communication link is established. If it is a mobile smart terminal with low-frequency communication capabilities, the sensor enters a special direct connection mode, allowing the terminal to directly read the underlying data stream. During data transmission, the integrated chip unit sends the generated tire status recognition results through the Bluetooth antenna module unit according to preset routing rules. If the target device is the vehicle's digital key control module, the data is directly uploaded to the dashboard display; if the target device is a mobile smart terminal, the data is pushed to the mobile app interface.

[0056] In summary, the low-frequency wake-up communication method for the Bluetooth smart tire pressure sensor provided in this application has the following technical effects: The Bluetooth smart tire pressure sensor includes a low-frequency module unit, an integrated chip unit, and a Bluetooth antenna module unit. The Bluetooth smart tire pressure sensor receives low-frequency trigger signals sent by external devices through the low-frequency module unit. The integrated chip unit decodes the low-frequency trigger signals and controls the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode based on the decoding result. In the working mode, the integrated chip unit controls the smart sensing module to collect tire state parameters in real time and performs edge state recognition based on the tire state parameters to generate a localized tire state recognition result. The integrated chip unit sends the tire state recognition result to the target device via Bluetooth communication through the Bluetooth antenna module unit. In other words, by integrating edge state recognition functionality at the sensor end, generating a localized tire state recognition result with classification tags based on the collected tire state parameters reduces the amount of Bluetooth data transmitted, lowers the processing load at the receiving end, improves the autonomy and timeliness of anomaly detection and reporting, and enhances the reliability and stability of the Bluetooth smart tire pressure sensor.

[0057] Example 2: Based on the same inventive concept as the low-frequency wake-up communication method for the Bluetooth smart tire pressure sensor in Example 1, this application also provides a low-frequency wake-up communication system for the Bluetooth smart tire pressure sensor. Please refer to the appendix. Figure 2The low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor includes: a signal receiving module 11, used for the Bluetooth smart tire pressure sensor to receive a low-frequency trigger signal sent by an external device through the low-frequency module unit; a signal decoding module 12, used for the integrated chip unit to decode the low-frequency trigger signal, and to control the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode according to the signal decoding result; an edge state recognition module 13, used for the integrated chip unit to control the smart sensing module to collect tire state parameters in real time in the working mode, and to perform edge state recognition based on the tire state parameters to generate a localized tire state recognition result; and a data transmission module 14, used for the integrated chip unit to send the tire state recognition result to the target device through the Bluetooth antenna module unit via Bluetooth communication.

[0058] Furthermore, the signal decoding module 12 in the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor is also used for: demodulating the low-frequency trigger signal by the integrated chip unit and extracting instruction encoding information; parsing the instruction encoding information based on a preset instruction mapping relationship and generating a corresponding signal decoding instruction, wherein the signal decoding instruction contains the operation type to be executed; and sending a mode switching control signal to the power management circuit and functional unit circuit of the Bluetooth smart tire pressure sensor according to the signal decoding instruction, so that the Bluetooth smart tire pressure sensor responds to the mode switching control signal and switches from low-power standby mode to working mode.

[0059] Furthermore, the signal decoding module 12 in the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor is also used for: the operation type included in the signal decoding instruction includes at least one of immediate reporting, delayed reporting, and self-test; if the signal decoding instruction is an immediate reporting instruction, the Bluetooth smart tire pressure sensor immediately performs tire status parameter acquisition after entering the working mode; if the signal decoding instruction is a delayed reporting instruction, the integrated chip unit starts an internal timer after entering the working mode, and performs tire status parameter acquisition after the timer reaches a preset delay time; if the signal decoding instruction is a self-test instruction, the integrated chip unit performs battery voltage and chip operating status detection after entering the working mode, and generates self-test status information as part of the tire status identification result.

[0060] Furthermore, the edge state recognition module 13 in the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor is also used for: in the working mode, the integrated chip unit sends a collection command to the smart sensing module; the smart sensing module responds to the collection command, synchronously collects the current pressure data and current temperature data of the tire, and sends the current pressure data and current temperature data as tire state parameters to the integrated chip unit; the integrated chip unit compares the received current pressure data and current temperature data with preset pressure thresholds and preset temperature thresholds respectively, and judges the tire state according to the comparison result, generates a tire state recognition result, and the tire state recognition result is associated with a tire state classification label.

[0061] Furthermore, the edge state recognition module 13 in the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor is also used to: when the tire state classification label indicates an abnormal tire state, the integrated chip unit generates an abnormality monitoring instruction; based on the abnormality monitoring instruction, control the Bluetooth antenna module unit to increase the transmission power or shorten the transmission interval, and send the tire state recognition result at a higher frequency.

[0062] Furthermore, the data transmission module 14 in the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor is also used for: the integrated chip unit combining and encapsulating the tire status recognition result, the unique identification information of the Bluetooth smart tire pressure sensor, and the data generation time point into a transmission data packet; the integrated chip unit calling the driver of the Bluetooth antenna module unit to frame the transmission data packet according to a predetermined Bluetooth communication protocol format to generate a Bluetooth data frame; and controlling the Bluetooth antenna module unit to send the Bluetooth data frame to the target device.

[0063] Furthermore, the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor also includes: the external device is a low-frequency triggering device of a digital key system or a mobile smart terminal with low-frequency communication function; the target device is a vehicle's digital key control module or a mobile smart terminal.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The low-frequency wake-up communication method and specific examples of the Bluetooth smart tire pressure sensor in the foregoing embodiment one are also applicable to the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor in this embodiment. Through the foregoing detailed description of the low-frequency wake-up communication method of the Bluetooth smart tire pressure sensor, those skilled in the art can clearly understand the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0066] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application also intends to include such modifications and variations.

Claims

1. A low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor, characterized in that, The method is applied to a Bluetooth smart tire pressure sensor comprising a low-frequency module unit, an integrated chip unit, and a Bluetooth antenna module unit, and the method includes: The Bluetooth smart tire pressure sensor receives low-frequency trigger signals sent by external devices through the low-frequency module unit; The integrated chip unit decodes the low-frequency trigger signal and controls the Bluetooth smart tire pressure sensor to switch from low-power standby mode to working mode based on the signal decoding result. In the operating mode, the integrated chip unit controls the intelligent sensing module to collect tire status parameters in real time, and performs edge status recognition based on the tire status parameters to generate localized tire status recognition results. The integrated chip unit transmits the tire status identification result to the target device via Bluetooth communication through the Bluetooth antenna module unit.

2. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 1, characterized in that, The external device is a low-frequency triggering device for a digital key system or a mobile smart terminal with low-frequency communication function. The target device is a vehicle's digital key control module or a mobile smart terminal.

3. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 1, characterized in that, The integrated chip unit decodes the low-frequency trigger signal and controls the Bluetooth smart tire pressure sensor to switch from a low-power standby mode to a working mode based on the signal decoding result, including: The integrated chip unit demodulates the low-frequency trigger signal and extracts the instruction encoding information; Based on a preset instruction mapping relationship, the instruction encoding information is parsed to generate a corresponding signal decoding instruction, which includes the type of operation to be performed. According to the signal decoding instruction, a mode switching control signal is sent to the power management circuit and functional unit circuit of the Bluetooth smart tire pressure sensor, so that the Bluetooth smart tire pressure sensor responds to the mode switching control signal and switches from low power standby mode to working mode.

4. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 3, characterized in that, The signal decoding command includes at least one of the following operation types: immediate reporting, delayed reporting, and self-testing. If the signal decoding command is an immediate reporting command, the Bluetooth smart tire pressure sensor will immediately perform tire status parameter acquisition after entering the working mode; If the signal decoding instruction is a delayed reporting instruction, the integrated chip unit starts an internal timer after entering the working mode, and performs tire status parameter acquisition after the timer reaches the preset delay time. If the signal decoding instruction is a self-test instruction, then after entering the working mode, the integrated chip unit performs detection of battery voltage and chip operating status, and generates self-test status information as part of the tire status identification result.

5. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 1, characterized in that, In the stated operating mode, the integrated chip unit controls the intelligent sensing module to collect tire state parameters in real time, and performs edge state recognition based on the tire state parameters to generate localized tire state recognition results, including: In the operating mode, the integrated chip unit sends a data acquisition command to the intelligent sensing module; The intelligent sensing module responds to the acquisition command by simultaneously acquiring the current pressure data and current temperature data of the tire, and sends the current pressure data and current temperature data as tire status parameters to the integrated chip unit. The integrated chip unit compares the received current pressure data and current temperature data with preset pressure thresholds and preset temperature thresholds, respectively, and determines the tire condition based on the comparison results, generating a tire condition identification result. The tire condition identification result is associated with a tire condition classification label.

6. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 5, characterized in that, The method further includes: When the tire condition classification label indicates an abnormal tire condition, the integrated chip unit generates an abnormality monitoring instruction; Based on the anomaly monitoring command, the Bluetooth antenna module unit is controlled to increase the transmission power or shorten the transmission interval to send the tire status identification results at a higher frequency.

7. The low-frequency wake-up communication method for a Bluetooth smart tire pressure sensor as described in claim 1, characterized in that, The integrated chip unit transmits the tire status recognition result to the target device via Bluetooth communication through the Bluetooth antenna module unit, including: The integrated chip unit combines and encapsulates the tire condition recognition result, the unique identification information of the Bluetooth smart tire pressure sensor, and the data generation time point into a transmission data packet. The integrated chip unit calls the driver of the Bluetooth antenna module unit to frame the transmission data packet according to the predetermined Bluetooth communication protocol format and generate a Bluetooth data frame. The Bluetooth antenna module unit is controlled to send the Bluetooth data frame to the target device.

8. A low-frequency wake-up communication system for a Bluetooth smart tire pressure sensor, characterized in that, The steps for implementing the low-frequency wake-up communication method of the Bluetooth smart tire pressure sensor according to any one of claims 1 to 7, wherein the low-frequency wake-up communication system of the Bluetooth smart tire pressure sensor comprises: A signal receiving module is used for the Bluetooth smart tire pressure sensor to receive low-frequency trigger signals sent by external devices through the low-frequency module unit; The signal decoding module is used to decode the low-frequency trigger signal by the integrated chip unit and control the Bluetooth smart tire pressure sensor to switch from low-power standby mode to working mode according to the signal decoding result. An edge state recognition module is used in the working mode to control the intelligent sensing module to collect tire state parameters in real time, and to perform edge state recognition based on the tire state parameters to generate localized tire state recognition results. The data transmission module is used by the integrated chip unit to send the tire status identification result to the target device via Bluetooth communication through the Bluetooth antenna module unit.

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