Control method and apparatus for radio frequency broadcast signals, and tire pressure monitoring system

Abstract

A control method for radio frequency broadcast signals. The method comprises: acquiring tire pressure information and the wheel speed of a vehicle (1) (S100); on the basis of the tire pressure information and the wheel speed, determining the operational status of tire pressure measurement devices (11, 12, 13, 14) (S200); and on the basis of the operational status of the tire pressure measurement devices (11, 12, 13, 14), enabling or disabling the transmission of radio frequency broadcast signals. In the method, a radio frequency broadcast function is intelligently enabled or disabled on the basis of the operational status of tire pressure measurement devices (11, 12, 13, 14), thereby ensuring the reliability, efficiency and safety of a system and also reducing the unnecessary energy consumption of the devices in each operating stage, and thus prolonging the service life of the devices; and a whitelist mechanism is combined with an identity authentication process within a limited time period to provide a safer and more efficient authentication method for the tire pressure measurement devices (11, 12, 13, 14), thereby preventing access by unauthorized devices, and also enhancing the user convenience for authenticated devices by means of a simplified reconnection process. Further disclosed are a control apparatus for radio frequency broadcast signals, and a tire pressure monitoring system.

Description

Control methods and devices for radio frequency broadcast signals, tire pressure monitoring systems Technical Field

[0001] This application belongs to the field of radio frequency broadcasting technology, and in particular relates to a control method and device for radio frequency broadcasting signals and a tire pressure monitoring system. Background Technology

[0002] A Tire Pressure Monitoring System (TPMS) typically consists of a tire pressure measuring device and a tire pressure receiving device. The tire pressure measuring device monitors and collects tire status data in real time using multiple integrated sensors, and transmits this data to the tire pressure receiving device via radio frequency technology. The tire pressure receiving device is responsible for processing and displaying the tire status data and issuing fault alarms when necessary.

[0003] The tire pressure monitoring system (TPMS) is installed inside the wheel and powered by a passive button battery. When the vehicle is stationary, to reduce energy consumption and extend the button battery life, the TPMS automatically switches to a sleep mode, during which its radio frequency (RF) transmission function is temporarily disabled. However, even in this state, the TPMS still needs to communicate with external devices, such as for upgrading the TPMS system software, tire alignment, and scanning for nearby RF devices and diagnosing tire pressure sensors.

[0004] Currently, wake-up mechanisms for tire pressure monitoring systems (TPMS) include using Near Field Communication (NFC) technology or triggering a low-frequency 433MHz microcontroller unit (MCU) system to initiate wireless radio frequency (RF) communication. However, these methods require additional hardware modules to enable the RF module wake-up operation of the TPMS. Furthermore, the TPMS RF module may also include receiving a specific frequency OOK (On-Off Keying) signal to trigger the TPMS wake-up. OOK RF wake-up technology uses a signal strength range of -18dBm to -30dBm, with a communication distance typically less than 10 cm. However, in TPMS systems, the distance between the TPMS receiver and the TPMS measuring device is often greater, which may cause attenuation of the OOK signal transmitted by the TPMS receiver, affecting the wake-up effect.

[0005] Therefore, in order to effectively manage the energy consumption of tire pressure measurement equipment at different operating stages, it is particularly important to design reasonable wake-up strategies, radio frequency broadcasting and connection timing, and service management strategies. Summary of the Invention

[0006] The purpose of this application is to provide a method and apparatus for controlling radio frequency broadcast signals and a tire pressure monitoring system, which can reduce the ineffective power consumption of tire pressure measuring equipment at different working stages and extend the service life of the equipment.

[0007] In a first aspect, this application provides a method for controlling radio frequency broadcast signals, applied to a tire pressure measuring device located inside the tire rim of a vehicle. The method includes: acquiring tire pressure information and wheel speed of the vehicle; determining the life status of the tire pressure measuring device based on the tire pressure information and the wheel speed; and starting or stopping the transmission of radio frequency broadcast signals based on the life status of the tire pressure measuring device.

[0008] In one implementation of the first aspect, determining the life status of the tire pressure measuring device based on the tire pressure information and the wheel speed includes:

[0009] The tire pressure information is compared with a preset threshold value;

[0010] If the tire pressure information is lower than the preset threshold, the tire pressure measuring device enters factory mode; otherwise, the tire pressure measuring device enters vehicle-installed mode.

[0011] In the factory mode, if a first radio frequency wake-up signal is received, the tire pressure measuring device enters the interrupt wake-up mode;

[0012] In the vehicle-installed mode, if a first radio frequency wake-up signal or a second radio frequency wake-up signal is received, the tire pressure measuring device enters the vehicle-installed pairing mode.

[0013] In the interrupted wake-up mode and / or the vehicle-installed pairing mode, the connection and identity authentication are performed with the tire pressure receiving device;

[0014] If authentication is successful, the tire pressure measuring device enters paired mode; otherwise, the tire pressure measuring device enters unpaired mode.

[0015] In the paired mode, it is determined whether the wheel speed has changed;

[0016] If the wheel speed remains unchanged, the tire pressure measuring device enters a stationary mode; otherwise, the tire pressure measuring device enters a moving mode.

[0017] One implementation of the first aspect also includes:

[0018] Obtain the power of the tire pressure measuring device;

[0019] If the battery level is lower than a preset threshold, the tire pressure measuring device enters a low battery mode.

[0020] In one implementation of the first aspect, the process of acquiring the first radio frequency wake-up signal includes: receiving the first radio frequency wake-up signal sent by a wireless radio frequency device; the process of acquiring the second radio frequency wake-up signal includes: generating the second radio frequency wake-up signal based on the change in wheel speed when the wheel speed changes.

[0021] In one implementation of the first aspect, the first radio frequency wake-up signal is used to wake up the radio frequency broadcast based on modulation techniques of different frequencies, wherein the modulation techniques of different frequencies include amplitude shift keying, on / off keying, frequency shift keying, Gaussian frequency shift keying, and phase shift keying.

[0022] One implementation of the first aspect also includes:

[0023] A timer is started simultaneously with the tire pressure measuring device entering the interrupt wake-up mode;

[0024] If the timer expires, the tire pressure measuring device will re-enter factory mode.

[0025] In one implementation of the first aspect, in the interrupted wake-up mode and / or the vehicle-installed pairing mode, the connection authentication with the tire pressure receiving device includes:

[0026] Determine whether the tire pressure receiving device is a whitelisted device;

[0027] If so, no identity authentication is required, and it is assumed that the tire pressure measuring device and the tire pressure receiving device have been successfully authenticated.

[0028] Otherwise, authentication with the tire pressure receiving device must be performed within a specified time period.

[0029] In one implementation of the first aspect, authentication with the tire pressure receiving device within a limited time period includes:

[0030] A local random number is sent to the tire pressure receiving device, which then encrypts the local random number to obtain an encrypted random number.

[0031] Receive the encrypted random number sent by the tire pressure receiving device;

[0032] The encrypted random number is decrypted to obtain the decrypted random number;

[0033] The decrypted random number is matched with the local random number;

[0034] If the decrypted random number matches the local random number, the authentication is successful; otherwise, the authentication fails.

[0035] Secondly, this application provides a control device for a radio frequency broadcast signal, comprising: a processor and a memory; the memory storing program instructions; the processor being configured to execute the program instructions to perform the control method for the radio frequency broadcast signal as described in any of the preceding claims.

[0036] Thirdly, this application provides a tire pressure monitoring system, comprising: a tire pressure measuring device located inside the tire rim of a vehicle; the tire pressure measuring device includes a pressure sensor, a strain sensor, a first radio frequency module, a passive battery, and a control device for the radio frequency broadcast signal as described above, wherein the pressure sensor is used to monitor the tire pressure information of the vehicle, the strain sensor is used to monitor the wheel speed of the vehicle, the first radio frequency module is used to transmit or interrupt the radio frequency broadcast signal under the control of the control device for the radio frequency broadcast signal, and the passive battery is used to power the pressure sensor, the strain sensor, the first radio frequency module, and the control device for the radio frequency broadcast signal; a tire pressure receiving device installed on the vehicle network bus; the tire pressure receiving device includes a second radio frequency module, an active battery, and a receiving control unit, wherein the receiving control unit is communicatively connected to the second radio frequency module, used to acquire a power-on command from the vehicle, and based on the power-on command from the vehicle, activate the second radio frequency module to scan the radio frequency broadcast signal, and the active battery is used to power the second radio frequency module and the receiving control unit; and a wireless radio frequency device, wirelessly connected to the control device for the radio frequency broadcast signal based on radio frequency communication technology, used to send a first radio frequency wake-up signal to the control device for the radio frequency broadcast signal.

[0037] As described above, the radio frequency broadcast signal control method and apparatus, and the tire pressure monitoring system of this application have the following beneficial effects:

[0038] (1) It can intelligently start or stop the radio frequency broadcast function according to the life status of the tire pressure measurement device, which not only ensures the reliability, efficiency and safety of the system, but also significantly reduces the unnecessary energy consumption of the equipment in each working stage, thereby extending the life of the equipment.

[0039] (2) By combining a whitelist mechanism with an identity authentication process within a limited time period, a safer and more efficient authentication method is provided for tire pressure measurement devices. This not only prevents unauthorized devices from accessing the device, but also enhances the user convenience of authenticated devices by simplifying the reconnection process. Attached Figure Description

[0040] Figure 1 shows a schematic diagram of an application scenario of the tire pressure measuring device described in this application.

[0041] Figure 2 shows a flowchart of one embodiment of the radio frequency broadcast signal control method described in this application.

[0042] Figure 3 shows a schematic diagram of the life state transition of the tire pressure measurement device described in one embodiment of this application.

[0043] Figure 4 shows a waveform of the OOK modulation signal described in one embodiment of this application.

[0044] Figure 5 shows an authentication flowchart of the tire pressure measuring device and the tire pressure receiving device in one embodiment of this application.

[0045] Figure 6 shows a schematic diagram of the structure of the radio frequency broadcast signal control device described in one embodiment of this application.

[0046] Figure 7 shows a schematic diagram of the tire pressure monitoring system described in one embodiment of this application.

[0047] Figure 8 shows a schematic diagram of the tire pressure measuring device described in one embodiment of this application.

[0048] Figure 9 shows a schematic diagram of the tire pressure receiving device described in one embodiment of this application.

[0049] Figure 10 shows a schematic diagram of the tire pressure monitoring system described in this application in another embodiment. Detailed Implementation

[0050] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0051] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0053] The following embodiments of this application provide a method and apparatus for controlling radio frequency broadcast signals, and a tire pressure monitoring system, for reducing the ineffective power consumption of tire pressure measuring equipment at different working stages and extending the battery life of the equipment.

[0054] Figure 1 illustrates a scenario where the tire pressure measurement device described in this application is applied to a vehicle. In the example shown in Figure 1, a vehicle 1 is exemplarily depicted with four tires: left front (FL), left rear (RL), right front (FR), and right rear (RR). The tire pressure measurement devices 11, 12, 13, and 14 of this application are respectively located inside the rims of the four tires of the vehicle 1. A tire pressure receiving device 15 is also provided on the vehicle body. The tire pressure receiving device 15 is mounted on the vehicle network bus and communicates with the tire pressure measurement devices via wireless radio frequency technology.

[0055] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0056] As shown in Figure 2, this embodiment provides a method for controlling radio frequency broadcast signals, which is applied to a tire pressure measurement device. The method includes the following steps S100 to S300.

[0057] In step S100, the tire pressure information and wheel speed of the vehicle are obtained.

[0058] In step S200, the life status of the tire pressure measuring device is determined based on the tire pressure information and the wheel speed.

[0059] In step S300, the transmission of the radio frequency broadcast signal is started or stopped according to the life status of the tire pressure measuring device.

[0060] In one embodiment of this application, the tire pressure measuring device integrates multiple sensors, including a temperature sensor, a humidity sensor, a pressure sensor, and a strain sensor.

[0061] In this embodiment, a pressure sensor is used to monitor the vehicle's tire pressure information, and a strain sensor is used to monitor the vehicle's motion status data, such as wheel speed and displacement data. Wheel speed can be either the speed of wheel movement or the acceleration of movement. One purpose of obtaining wheel speed in this application is to detect whether the vehicle is moving; therefore, both wheel speed and acceleration are applicable to this application.

[0062] Figure 3 shows a schematic diagram illustrating the life state transition of the tire pressure measuring device described in this application embodiment.

[0063] Table 1 shows the life status table of the tire pressure measuring device described in the embodiments of this application.

[0064] In one embodiment of this application, step S200, which determines the life status of the tire pressure measuring device based on the tire pressure information and the wheel speed, includes the following steps S201 to S208.

[0065] In step S201, the tire pressure information is compared with a preset threshold value.

[0066] Specifically, the preset threshold value can be pre-set according to tire safety standards before the tire pressure measuring device leaves the factory.

[0067] In step S202, if the tire pressure information is lower than the preset threshold, the tire pressure measuring device enters factory mode; otherwise, the tire pressure measuring device enters vehicle-installed mode.

[0068] Specifically, if the tire pressure information detected by the pressure sensor is lower than a preset threshold, it indicates that the tire is not fully inflated and the device has not yet been installed on the tire. In this case, the tire pressure measurement device will enter factory mode. In factory mode, the device's wireless radio frequency function remains off to save power and avoid sending erroneous data when not installed.

[0069] Conversely, if the tire pressure information is higher than or equal to a preset threshold, it indicates that the tire has been inflated to sufficient pressure and the device has been installed on the tire. At this point, the tire pressure measuring device will enter the vehicle-mounted mode and activate the wireless radio frequency function.

[0070] In this implementation, the wireless radio frequency function is activated only when the tire pressure measurement device is correctly installed and under safe air pressure conditions, thereby avoiding the transmission of erroneous data and potential false alarms, and improving the reliability of the system and the convenience of the user.

[0071] In step S203, in the factory mode, if a first radio frequency wake-up signal is received, the tire pressure measuring device enters the interrupt wake-up mode.

[0072] In one embodiment of this application, the process of acquiring the first radio frequency wake-up signal includes: receiving the first radio frequency wake-up signal sent by a wireless radio frequency device.

[0073] Specifically, the wireless radio frequency device is a portable terminal. When testing is required, the operator can activate the device's wireless radio frequency function by holding the wireless radio frequency device close to it and sending a radio frequency wake-up signal.

[0074] In this embodiment, after receiving the first radio frequency wake-up signal, the tire pressure measurement device in factory mode is woken up and enters interrupt wake-up mode. In interrupt wake-up mode, the device initiates a limited-duration radio frequency broadcast and allows limited-duration connection services such as updating firmware, updating device parameters, tire alignment and pairing processing, and saving a whitelist of connectable devices.

[0075] In one embodiment of this application, a timer is started when the tire pressure measuring device enters the interrupt wake-up mode; if the timer expires, the tire pressure measuring device enters the factory mode again.

[0076] In this implementation, the device's wireless radio frequency function is periodically woken up according to the built-in timer, which can effectively save energy and reduce costs.

[0077] In step S204, in the vehicle-installed mode, if a first radio frequency wake-up signal or a second radio frequency wake-up signal is received, the tire pressure measuring device enters the vehicle-installed pairing mode.

[0078] In one embodiment of this application, the process of acquiring the second radio frequency wake-up signal includes: generating the second radio frequency wake-up signal based on the change value of the wheel speed when the wheel speed changes.

[0079] Specifically, the tire pressure measurement device of this application can not only respond to the first radio frequency wake-up signal sent by an external wireless radio frequency device, but also achieve self-wake-up by periodically monitoring changes in wheel speed. When a change in wheel speed is detected, the device automatically activates the wireless radio frequency function, broadcasts tire pressure data, and establishes a connection with the tire pressure receiving device to conduct connection and interaction services.

[0080] In this embodiment, after receiving the second radio frequency wake-up signal, the tire pressure measurement device in the vehicle-installed mode is woken up and enters the vehicle-installed pairing mode. In the vehicle-installed pairing mode, the device will initiate a limited-duration radio frequency broadcast and allow limited-duration connection services such as updating firmware, updating device parameters, tire alignment pairing processing, and saving a whitelist of connectable devices.

[0081] In one embodiment of this application, the first radio frequency wake-up signal is used to wake up radio frequency broadcasting based on modulation techniques of different frequencies, wherein the modulation techniques of different frequencies include amplitude shift keying (ASK), on / off keying (OOK), frequency shift keying (FSK), Gaussian frequency shift keying (GFSK), and phase shift keying (PSK).

[0082] Taking OOK modulation technology as an example, its modulation principle mainly involves controlling the amplitude of the carrier signal to transmit information. Specifically, as shown in Figure 4, v m (t) is the digital signal to be transmitted, Acos(2πf) c t) is the unmodulated carrier wave, v AM (t) is the carrier signal modulated by OOK.

[0083] In OOK modulation, one state of the signal corresponds to a carrier amplitude of 0, and another state corresponds to a carrier amplitude of 1. This modulation is also known as binary amplitude keying (2ASK), in which a unipolar non-return-to-zero code sequence is used to control the on and off of the sinusoidal carrier.

[0084] When using OOK modulation technology to wake up radio frequency broadcasts, based on experience, the receiving power should generally be set between -19dBm and -30dBm, and the frequency should be set to 1kHz to ensure effective signal reception and processing.

[0085] In step S205, during the interrupted wake-up mode and / or the vehicle-installed pairing mode, connection authentication is performed with the tire pressure receiving device.

[0086] In one embodiment of this application, in the interrupt wake-up mode and / or the vehicle-mounted pairing mode, the connection authentication with the tire pressure receiving device includes: determining whether the tire pressure receiving device is a whitelisted device; if so, no authentication is performed, and it is assumed that the tire pressure measuring device and the tire pressure receiving device have been successfully authenticated; otherwise, authentication is performed with the tire pressure receiving device within a limited time period.

[0087] Specifically, if the tire pressure receiving device is a whitelisted device, its address is stored when it is first paired with the tire pressure measuring device. This mechanism ensures that only previously authenticated and trusted devices can connect without further authentication. Conversely, if the tire pressure receiving device attempting to connect is not on the whitelist, i.e., it is a non-whitelisted device, the tire pressure measuring device will authenticate with that device within a limited time period.

[0088] As shown in Figure 5, in one embodiment of this application, authentication with the tire pressure receiving device within a limited time period includes: sending a local random number to the tire pressure receiving device, which then encrypts the local random number to obtain an encrypted random number; receiving the encrypted random number sent by the tire pressure receiving device; decrypting the encrypted random number to obtain a decrypted random number; matching the decrypted random number with the local random number; if the decrypted random number matches the local random number, authentication is successful; otherwise, authentication fails.

[0089] Specifically, the tire pressure receiving device encrypts the local random number using a password or certificate. If the tire pressure receiving device can be authenticated within a limited time period, it will be added to a whitelist, and future connection attempts will not require re-authentication. If authentication fails, the tire pressure measuring device will interrupt or refuse connection to the tire pressure receiving device.

[0090] This implementation combines a whitelist mechanism with a limited-time identity authentication process, providing a more secure and efficient authentication method for tire pressure measurement devices. This not only prevents unauthorized devices from accessing the device but also enhances user convenience for authenticated devices by simplifying the reconnection process.

[0091] In step S206, if the identity authentication is successful, the tire pressure measuring device enters the paired mode; otherwise, the tire pressure measuring device enters the unpaired mode.

[0092] Specifically, in paired mode, the tire pressure measurement device adjusts its business logic processing according to the negotiated parameters after pairing with the tire pressure receiving device. These negotiated parameters include: the limited duration of radio frequency broadcasts, the limited duration of communication services, the update acquisition frequency and broadcast data frequency, whether long connections are allowed, various judgment thresholds, and the OTA upgrade timing, such as enabling a limited-duration connectable broadcast for OTA services after acceleration has been in a stopped state for N minutes. Furthermore, if pairing is successful, the tire pressure measurement device continues to receive configuration business data, such as broadcast intervals, broadcast data, and whether long connections are allowed for sending broadcast data. It also saves the configuration parameters and broadcasts or sends data according to these parameters.

[0093] In unpaired mode, the device does not perform any business logic processing and continues to wait for the next authentication request.

[0094] In one embodiment of this application, the tire pressure measurement device in the wake-up state broadcasts tire pressure data and pairing status. During this process, the broadcast frequency will follow a default setting or a frequency determined through negotiation. When the negotiation parameters include an option to allow long-connection mode for sending tire pressure data, the tire pressure measurement device can send tire pressure data to whitelisted devices.

[0095] In step S207, in the paired mode, it is determined whether the wheel speed has changed.

[0096] Specifically, this application incorporates a timer within the tire pressure measurement device, which is responsible for time-limited operations; the microcontroller unit (MCU) of the tire pressure measurement device acquires speed data from the strain sensor in real time and analyzes the data to determine whether there are significant changes in wheel speed.

[0097] In step S208, if the wheel speed does not change, the tire pressure measuring device enters a stationary mode; otherwise, the tire pressure measuring device enters a moving mode.

[0098] In stationary mode, the tire pressure monitoring system uses radio frequency (RF) functionality to broadcast and provide connectivity services for a limited time. If a change in wheel speed is detected in stationary mode, the system will switch from stationary mode to sport mode.

[0099] In Sport mode, the tire pressure monitoring system automatically broadcasts the collected data and allows whitelisted devices to connect for an unlimited amount of time.

[0100] In this embodiment, the tire pressure measurement device in stationary mode is allowed to anchor other devices or perform radio frequency relay services; while in motion mode, the tire pressure measurement device is not allowed to perform OTA services, pairing operations, or accept whitelist update services.

[0101] Table 1. Life Status Table of Tire Pressure Measurement Equipment

[0102] In one embodiment of this application, the control method for the radio frequency broadcast signal provided in this embodiment further includes: acquiring the power level of the tire pressure measuring device; if the power level is lower than a preset threshold, the tire pressure measuring device enters a low power mode.

[0103] Typically, after several years of use, the device may become insufficient in power supply due to battery performance degradation, or it may enter a low-battery state due to continuous power consumption while in a vehicle standby state for a long time.

[0104] In low-power mode, to reduce energy consumption, the tire pressure measurement device is restricted to low-speed broadcast transmission. During this mode, the device will broadcast tire pressure data at a reduced frequency and disable any connectivity services to ensure the device can continue operating for a longer period with limited energy supply.

[0105] In one embodiment of this application, the method for controlling radio frequency broadcast signals provided in this application further includes: if the wheel speed is lower than a preset value within a preset time period, the tire pressure measuring device enters a sleep mode. For example, if the wheel speed remains at 0 for one minute, the tire pressure measuring device enters a sleep mode.

[0106] It should be noted that the priority of the tire pressure monitoring device entering sleep mode is generally lower than that of the timer. In other words, if the timer prompts the tire pressure monitoring device to broadcast, or if the tire pressure monitoring device and the tire pressure receiving device are in a connected state, then the tire pressure monitoring device will not enter sleep mode.

[0107] It should be noted that the protection scope of the radio frequency broadcast signal control method described in the embodiments of this application is not limited to the execution order of the steps listed in this embodiment. Any solution implemented by adding, subtracting, or replacing steps in the prior art based on the principles of this application is included within the protection scope of this application.

[0108] As shown in Figure 6, this embodiment provides a control device for radio frequency broadcast signals, including a processor and a memory.

[0109] The memory stores program instructions.

[0110] The processor is used to run the program instructions to perform the control method for the radio frequency broadcast signal as described in any of the preceding claims.

[0111] Preferably, the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0112] The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0113] It should be noted that the radio frequency broadcast signal control device provided in this application embodiment can implement the radio frequency broadcast signal control method described in this application. However, the implementation device of the radio frequency broadcast signal control method described in this application includes, but is not limited to, the structure of the radio frequency broadcast signal control device listed in this embodiment. All structural modifications and substitutions of the prior art made based on the principles of this application are included within the protection scope of this application.

[0114] As shown in Figure 7, this embodiment provides a tire pressure monitoring system, including a tire pressure measuring device, a tire pressure receiving device, and a wireless radio frequency device.

[0115] Figure 8 shows a schematic diagram of the tire pressure measuring device in an embodiment of this application.

[0116] In one embodiment of this application, the tire pressure measuring device is located inside the tire rim of the vehicle; the tire pressure measuring device includes a pressure sensor, a strain sensor, a first radio frequency module, a passive battery, and a control device for the radio frequency broadcast signal as described above, wherein the pressure sensor is used to monitor the tire pressure information of the vehicle, the strain sensor is used to monitor the wheel speed of the vehicle, the first radio frequency module is used to transmit or interrupt the radio frequency broadcast signal under the control of the control device for the radio frequency broadcast signal, and the passive battery is used to power the pressure sensor, the strain sensor, the first radio frequency module, and the control device for the radio frequency broadcast signal.

[0117] Figure 9 shows a schematic diagram of the tire pressure receiving device in an embodiment of this application.

[0118] In one embodiment of this application, the tire pressure receiving device is installed on the vehicle network bus; the tire pressure receiving device includes a second radio frequency module, an active battery, and a receiving control unit, wherein the receiving control unit is communicatively connected to the second radio frequency module, and is used to obtain the vehicle's power-on command, and based on the vehicle's power-on command, to start the second radio frequency module to scan the radio frequency broadcast signal, and the active battery is used to power the second radio frequency module and the receiving control unit.

[0119] Figure 10 shows a schematic diagram of the tire pressure monitoring system in another embodiment of this application.

[0120] In one embodiment of this application, the wireless radio frequency device is wirelessly connected to the control device of the radio frequency broadcast signal based on radio frequency communication technology, and is used to send a first radio frequency wake-up signal to the control device of the radio frequency broadcast signal.

[0121] In this embodiment, the first radio frequency module of the tire pressure measuring device transmits data to the second radio frequency module of the tire pressure receiving device via low-power wireless radio frequency technology.

[0122] Specifically, the low-power wireless radio frequency technologies include BLE (Bluetooth Low Energy), SLE (Smart Link Enhanced), and 433MHz RF.

[0123] In the application protocol stacks of low-power RF devices such as BLE and SLE, RF filtering wake-up capability in the range of 100MHz to 5GHz is typically provided. This design allows the device to be woken up by modulated radio waves of different frequencies (ASK, OOK, FSK, GFSK, PSK) when the wireless RF is in an extremely low-power state.

[0124] Specifically, radio frequency (RF) filtering wake-up capability refers to the fact that BLE and SLE application protocol stacks typically have RF filters that can detect signals within a specific frequency range. This means that the device can remain in a low-power standby state but can still detect changes in RF signals within a specific frequency range, thereby achieving wake-up.

[0125] Different frequency modulation refers to the ability of devices to be woken up by radio waves using modulation techniques at different frequencies. This includes amplitude modulation (AM), frequency modulation (FM), and the intensity measurement or radio frequency on / off keying (OOK) modulation techniques mentioned by the user. Intensity measurement is a common radio frequency signal wake-up technique where the device measures the strength of the received signal. Once the received signal strength falls within a preset threshold within a certain time stamp, the device is woken up. This method is highly sensitive to distinguishing intensity changes from different signal sources. Alternatively, radio frequency on / off keying (OOK) modulation can be used. OOK modulation allows identifiable information to be embedded in the radio frequency signal in a modulated manner. In this case, specific information patterns are embedded in the radio frequency signal, which the device can identify and respond to by demodulation. Users can send specific radio frequency signals using mobile terminals or handheld devices to wake up specific BLE or SLE low-power devices. This provides users with flexibility and convenience, especially suitable for scenarios requiring near-field wake-up, such as tire pressure monitoring devices.

[0126] In one embodiment of this application, the control device for the radio frequency broadcast signal is a microcontroller (MCU), which integrates a timer. The timer can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0127] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, or methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or units may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of apparatuses or modules or units may be electrical, mechanical, or other forms.

[0128] The modules / units described as separate components may or may not be physically separate. The components shown as modules / units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules / units can be selected to achieve the objectives of the embodiments of this application, depending on actual needs. For example, the functional modules / units in the various embodiments of this application may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0129] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0130] This application also provides a computer-readable storage medium. Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing a processor. The program can be stored in a computer-readable storage medium, which is a non-transitory medium, such as random access memory, read-only memory, flash memory, hard disk, solid-state drive, magnetic tape, floppy disk, optical disk, and any combination thereof. The storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (DVD)), or a semiconductor medium (e.g., solid-state drive (SSD)).

[0131] This application embodiment may also provide a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this application embodiment are generated. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0132] When the computer program product is executed by a computer, the computer performs the method described in the foregoing method embodiments. The computer program product can be a software installation package; when the foregoing method is required, the computer program product can be downloaded and executed on the computer.

[0133] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0134] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for controlling radio frequency broadcast signals, applied to a tire pressure measuring device, wherein the tire pressure measuring device is located inside the tire rim of a vehicle, characterized in that, The method includes: Obtain vehicle tire pressure and wheel speed information; The life status of the tire pressure measuring device is determined based on the tire pressure information and the wheel speed. The transmission of radio frequency broadcast signals is activated or deactivated based on the life status of the tire pressure measuring device.

2. The method according to claim 1, characterized in that, Determining the operational status of the tire pressure measuring device based on the tire pressure information and the wheel speed includes: The tire pressure information is compared with a preset threshold value; If the tire pressure information is lower than the preset threshold, the tire pressure measuring device enters factory mode; otherwise, the tire pressure measuring device enters vehicle-installed mode. In the factory mode, if a first radio frequency wake-up signal is received, the tire pressure measuring device enters the interrupt wake-up mode; In the vehicle-installed mode, if a first radio frequency wake-up signal or a second radio frequency wake-up signal is received, the tire pressure measuring device enters the vehicle-installed pairing mode. In the interrupted wake-up mode and / or the vehicle-installed pairing mode, the connection and identity authentication are performed with the tire pressure receiving device; If authentication is successful, the tire pressure measuring device enters paired mode; otherwise, the tire pressure measuring device enters unpaired mode. In the paired mode, it is determined whether the wheel speed has changed; If the wheel speed remains unchanged, the tire pressure measuring device enters a stationary mode; otherwise, the tire pressure measuring device enters a moving mode.

3. The method according to claim 2, characterized in that, Also includes: Obtain the power of the tire pressure measuring device; If the battery level is lower than a preset threshold, the tire pressure measuring device enters a low battery mode.

4. The method according to claim 2, characterized in that, The process of acquiring the first radio frequency wake-up signal includes: receiving the first radio frequency wake-up signal sent by the wireless radio frequency device; the process of acquiring the second radio frequency wake-up signal includes: generating the second radio frequency wake-up signal based on the change value of the wheel speed when the wheel speed changes.

5. The method according to claim 2, characterized in that, The first radio frequency wake-up signal is used to wake up radio frequency broadcasts based on modulation techniques of different frequencies, wherein the modulation techniques of different frequencies include amplitude shift keying, on / off keying, frequency shift keying, Gaussian frequency shift keying, and phase shift keying.

6. The method according to claim 2, characterized in that, Also includes: A timer is started simultaneously with the tire pressure measuring device entering the interrupt wake-up mode; If the timer expires, the tire pressure measuring device will re-enter factory mode.

7. The method according to claim 2, characterized in that, In the interrupted wake-up mode and / or the vehicle-installed pairing mode, the connection authentication with the tire pressure receiving device includes: Determine whether the tire pressure receiving device is a whitelisted device; If so, no identity authentication is required, and it is assumed that the tire pressure measuring device and the tire pressure receiving device have been successfully authenticated. Otherwise, authentication with the tire pressure receiving device must be performed within a specified time period.

8. The method according to claim 7, characterized in that, Within a defined time period, authentication with the tire pressure receiving device includes: A local random number is sent to the tire pressure receiving device, which then encrypts the local random number to obtain an encrypted random number. Receive the encrypted random number sent by the tire pressure receiving device; The encrypted random number is decrypted to obtain the decrypted random number; The decrypted random number is matched with the local random number; If the decrypted random number matches the local random number, the authentication is successful; otherwise, the authentication fails.

9. A control device for radio frequency broadcast signals, characterized in that, include: Processor and memory; The memory stores program instructions; The processor is used to run the program instructions to perform the control method for the radio frequency broadcast signal as described in any one of claims 1 to 8.

10. A tire pressure monitoring system, characterized in that, include: A tire pressure measuring device is located inside the tire rim of a vehicle; the tire pressure measuring device includes a pressure sensor, a strain sensor, a first radio frequency module, a passive battery, and a control device for a radio frequency broadcast signal as described in claim 9, wherein the pressure sensor is used to monitor the tire pressure information of the vehicle, the strain sensor is used to monitor the wheel speed of the vehicle, the first radio frequency module is used to transmit or interrupt the radio frequency broadcast signal under the control of the control device for the radio frequency broadcast signal, and the passive battery is used to power the pressure sensor, the strain sensor, the first radio frequency module, and the control device for the radio frequency broadcast signal; A tire pressure receiving device is installed on the vehicle network bus. The tire pressure receiving device includes a second radio frequency module, an active battery, and a receiving control unit. The receiving control unit is communicatively connected to the second radio frequency module and is used to obtain the vehicle's power-on command. Based on the vehicle's power-on command, the second radio frequency module is activated to scan the radio frequency broadcast signal. The active battery is used to power the second radio frequency module and the receiving control unit. A wireless radio frequency device, based on radio frequency communication technology, is wirelessly connected to the control device of the radio frequency broadcast signal and is used to send a first radio frequency wake-up signal to the control device of the radio frequency broadcast signal.

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