A vehicle mounted unit

Abstract

The present application discloses a vehicle-mounted unit, including a first printed circuit board and a second printed circuit board, wherein the first printed circuit board includes: a system on chip SOC and a microcontroller MCU, the former is used to support the protocol stack of V2X communication, to send and receive related data and perform upper-layer processing, and the latter is used to expand the communication interface; the second printed circuit board includes: a communication module, which is used to realize V2X communication and locate the vehicle, and is also used to support the functions of T‑BOX; the communication module is compatible with supporting 4G and 5G communications in terms of packaging. Since V2X communication and traditional T‑BOX functions can be realized by the same vehicle-mounted unit, users do not need to use independent vehicle-mounted units and T‑BOX respectively, saving space in the car. The same packaging of the communication module in the second printed circuit board is compatible with supporting 4G and 5G communications, so switching between 4G and 5G communications can be realized without changing the hardware of the vehicle-mounted unit, which is very convenient.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle-mounted unit. Background Art

[0002] The vehicle-mounted T-BOX (full name Telematics BOX) is an important component of the Internet of Vehicles system. It is used to communicate with the application (Application, APP) of the backend system or user terminal devices such as mobile phones, so as to display vehicle information in the APP or control the vehicle through the APP. When the user sends a control command through the APP, the automotive telematics service provider (Telematics Service Provider, TSP) background sends a monitoring request instruction to the vehicle-mounted T-BOX. After the vehicle obtains the control command, it sends a control message through the CAN bus and realizes the control of the vehicle, and finally feeds back the operation results to the user's mobile phone APP. This function can help users remotely start the vehicle, turn on the air conditioner, adjust the seat to a suitable position, etc.

[0003] Vehicle to Everything (V2X) is a new generation of information and communication technology that connects vehicles to everything else. In V2X, V stands for vehicle, and X stands for any object that interacts with the vehicle, such as vehicles, people, roadside infrastructure, and networks. V2X functions can be implemented in vehicles through on-board units (OBUs).

[0004] The vehicle-mounted T-BOX and vehicle-mounted unit OBU on the market are sold as independent products. However, users have an increasing demand for miniaturized functional devices in vehicles. As the space in the vehicle is limited, users usually hope that the functional devices in the vehicle will occupy as little space as possible, so as to meet their other needs for the space in the vehicle. Summary of the invention

[0005] Based on the above problems, the present application provides a vehicle-mounted unit to solve the problem that the independent vehicle-mounted T-BOX and OBU occupy too much space in the vehicle.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] The present application provides a vehicle-mounted unit, comprising: a first printed circuit board and a second printed circuit board; the first printed circuit board comprises: a system on chip SOC and a microcontroller MCU;

[0008] The SOC supports a protocol stack for V2X communication, and the SOC is used for sending and receiving data and performing data processing;

[0009] The MCU is used to expand the communication interface;

[0010] The second printed circuit board includes: a communication module;

[0011] The communication module is used to realize V2X communication and cellular communication, to locate the vehicle, and to support the function of T-BOX; the cellular communication includes at least: 4G communication and 5G communication; the communication module is compatible with supporting 4G communication and 5G communication in packaging.

[0012] Optionally, the first printed circuit board further includes: a hardware security module HSM; the HSM is connected to the SOC via an SPI interface, a USB interface or an SDIO interface;

[0013] The hardware security module is used to sign the sent messages using an asymmetric encryption algorithm, verify the signatures of received messages, and store private keys.

[0014] Optionally, the first printed circuit board also includes: a spare global satellite navigation system GNSS module, the spare GNSS module is connected to the SOC via a universal asynchronous transceiver transmitter UART, supports centimeter-level precision positioning, and supports SBAS, DR and RTK services; the spare GNSS module is used to provide the vehicle's position, direction and speed, as well as timing.

[0015] Optionally, the first printed circuit board further comprises: an indicator light, a button, an audio collection device and an audio output device; the second printed circuit board further comprises: a switch, a power amplifier and a codec of the audio collection device; the codec is connected to the communication module;

[0016] The indicator light and the button are used in conjunction with the E-CALL service in the function of the T-BOX, wherein the button is specifically used to switch or start the state of the E-CALL, and the indicator light is used to indicate the current state of the E-CALL;

[0017] The MCU is used to output an indication signal to the indicator light and to receive an input signal from the button;

[0018] The audio acquisition device is used to acquire analog audio signals;

[0019] The switch of the audio acquisition device is used to switch the transmission direction of the analog audio signal. When the switch is in a first state, it is used to transmit the analog audio signal to the codec; when the switch is in a second state, it is used to send the analog audio signal to the vehicle computer;

[0020] The encoder / decoder is used to perform analog / digital conversion on the analog audio signal collected by the audio collection device, and transmit the converted digital audio signal to the communication module; it is also used to perform digital / analog conversion on the audio data to be played, and send the converted audio data to the power amplifier;

[0021] The power amplifier is used to amplify the received audio data to drive the audio output device to work.

[0022] Optionally, the first printed circuit board further includes: a power management circuit and a backup battery BUB; the MCU is used to implement power management through the power management circuit;

[0023] The power management circuit is used to charge and manage the charging of the BUB according to the control signal of the MCU, discharge and manage the discharge of the BUB, manage the switching between the main power supply and the BUB power supply, and supply and manage the power supply for the SOC, the MCU and the communication module.

[0024] Optionally, at least one of the following is integrated on the SOC or the MCU:

[0025] USB hub, vehicle Ethernet interface, CAN interface.

[0026] Optionally, the SOC also includes a reserved memory.

[0027] Optionally, the second printed circuit board also includes: a six-axis sensor, the six-axis sensor specifically includes: a three-axis gyroscope and a three-axis accelerometer; the six-axis sensor communicates with the communication module via an I2C interface or an SPI interface; the six-axis sensor is used to send a posture wake-up signal to the MCU to wake up the MCU, and is also used to provide data for inertial navigation.

[0028] Optionally, the second printed circuit board also includes: a WIFI and Bluetooth module connected to the communication module, and the WIFI and Bluetooth module are used to establish a WIFI connection with other terminal devices and perform Bluetooth communication.

[0029] Optionally, the second printed circuit board further includes: a radio frequency interface circuit for connecting and matching the communication module and an external antenna; the external antenna includes:

[0030] A first antenna, a V2X antenna, a positioning antenna, and a WIFI and Bluetooth antenna; the first antenna includes a 4G antenna and / or a 5G antenna; the WIFI and Bluetooth antennas correspond to the WIFI and Bluetooth modules.

[0031] Optionally, the first printed circuit board and the second printed circuit board are two different parts of the same circuit board; or, the first printed circuit board and the second printed circuit board are connected via a flexible circuit board; or, the first printed circuit board and the second printed circuit board are connected via a board-to-board connector.

[0032] Compared with the prior art, this application has the following beneficial effects:

[0033] The vehicle-mounted unit provided in the present application includes a first printed circuit board and a second printed circuit board, wherein the first printed circuit board includes: a system on chip SOC and a microcontroller MCU; the SOC is used to support the protocol stack of V2X communication, to send and receive related data and perform upper-layer processing, and the MCU is used to expand the communication interface; the second printed circuit board includes: a communication module, which is used to realize V2X communication and locate the vehicle, and is also used to support the function of T-BOX; the communication module is compatible with 4G and 5G communications in packaging. Since V2X communication and traditional T-BOX functions can be realized by the same vehicle-mounted unit, users do not need to use independent vehicle-mounted units and T-BOX respectively, saving space in the car. In addition, since the same packaging of the communication module in the second printed circuit board is compatible with 4G and 5G communications, it is possible to switch between 4G communication and 5G communication without changing the hardware of the vehicle-mounted unit, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 A schematic diagram of the structure of a vehicle-mounted unit provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of another vehicle-mounted unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] As described above, the vehicle-mounted unit OBU and vehicle-mounted T-BOX are currently independent of each other, so if users want the vehicle to have V2X and T-BOX functions, they need to configure independent OBU and T-BOX. However, the existence of two functional devices further reduces the remaining space in the car, which restricts the user's freedom of movement in the car on the one hand, and is not conducive to the realization and expansion of other vehicle functions on the other hand.

[0038] In view of the above problems, the inventor has provided a new type of vehicle-mounted unit (OBU) after research. The vehicle-mounted unit has both V2X communication function and traditional function of T-BOX. Since the above functions are implemented on the same OBU, it saves space in the vehicle and improves user experience.

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1 , which is a schematic diagram of the structure of a vehicle-mounted unit provided in an embodiment of the present application.

[0041] like Figure 1 As shown, the on-board unit OBU includes a first printed circuit board PCB1 and a second printed circuit board PCB2. PCB1 and PCB2 can be made in the form of a circuit board, that is, PCB1 and PCB2 are two different parts of the same circuit board. When PCB1 and PCB2 are made into two independent circuit boards, the two printed circuit boards can be connected in a variety of possible ways. The two circuit boards adopt a stacked board design. As an example, PCB1 and PCB2 are connected through a flexible printed circuit (FPC); as another example, PCB1 and PCB2 are connected through a board to board (B2B) connector. The connection method between PCB1 and PCB2 is described through the above two examples, but it can be understood that the connection method between PCB1 and PCB2 is not limited to the above two, so this embodiment does not limit this.

[0042] The first printed circuit board PCB1 includes: a system on chip (System on chip, SOC) and a microcontroller unit (Microcontroller Unit, MCU), which are connected via an SPI interface. It should be noted that the system on chip in this embodiment can also be called an application processor (Application Processor, AP). As an example, the SOC can use a processor of the model i.MX8DXP of NXP; the MCU can use a microcontroller of the model S32K14x series. The microcontroller of the S32K14x series has lower power consumption, and the processor of the model i.MX8DXP has higher performance.

[0043] In the OBU provided in this embodiment, the SOC is used to support the protocol stack of V2X communication and perform the sending and receiving of relevant data and upper-layer processing.

[0044] The MCU is used to expand communication interfaces, which may include but are not limited to CAN interface, SPI interface, UART interface and I2C interface.

[0045] The second printed circuit board PCB2 includes: a communication module. As an example, the module can be a combo module from suppliers such as Qualcomm, Huawei or Datang. The combo module can support versions for use in multiple regions, such as CN (China), NA (North America), EU (Europe, Middle East and Africa), etc. The communication module used in this embodiment can specifically be the Quectel AG520R module, which uses the SA415M model chip of Qualcomm; it can also be the Quectel AG550Q module, which uses the SA515M model chip of Qualcomm.

[0046] The communication module is used to realize V2X communication and locate the vehicle, and is also used to support the functions of T-BOX. As an example, the functions of T-BOX may include but are not limited to: E-CALL function, B-CALL function, I-CALL function and data upload function. Since the E-CALL function, B-CALL function, I-CALL function and data upload function are functions well known to those skilled in the art, the specific implementation methods of these functions will not be repeated here.

[0047] In addition, the communication module is used to realize cellular communication, such as 2G, 3G, 4G and 5G communication. Moreover, the communication module is compatible with 2G, 3G, 4G and 5G communication in packaging. In other words, when it is necessary to switch from 4G function to 5G function, or from 5G function to 4G function, there is no need to change the hardware packaging structure of the communication module, thereby saving modification costs and shortening the product development cycle.

[0048] From the above description, it can be seen that V2X communication and traditional T-BOX functions can be realized by the same vehicle-mounted unit. Therefore, users do not need to use independent vehicle-mounted units and T-BOXs respectively, saving space in the car. In addition, since the same package of the communication module in the second printed circuit board is compatible with 4G and 5G communications, it is possible to switch between 4G and 5G communications without changing the hardware of the vehicle-mounted unit, which is very convenient. It can be seen that the OBU can improve the user experience and save the cost of modifying the OBU when switching between 4G and 5G.

[0049] The present application also provides another vehicle-mounted unit. Figure 2 This figure is a schematic diagram of the structure of another vehicle-mounted unit provided in this embodiment.

[0050] like Figure 2 As shown, the first printed circuit board PCB1 also includes: a hardware security module (HSM); the HSM is connected to the SOC via an SPI interface, a USB interface or an SDIO interface. The HSM is used to sign the sent message using an asymmetric encryption algorithm, verify the signature of the received message and store the private key. As an example, the asymmetric encryption algorithm can be an elliptic curve encryption algorithm (ECC). The HSM meets the user's needs for OBU security, and improves the security performance of the OBU, such as the startup security and communication security.

[0051] As described above, the communication module of the second printed circuit board PCB2 has a high-precision positioning function. In order to prevent the high-precision positioning function of the communication module from being limited due to abnormal conditions or failures, a spare Global Navigation Satellite System (GNSS) module is added to the first printed circuit board PCB1 in this embodiment. Figure 2 As shown in the upper left corner of PCB2.

[0052] The backup GNSS module is connected to the SOC via a Universal Asynchronous Receiver / Transmitter (UART). The backup GNSS module supports centimeter-level precision positioning, SBAS, inertial navigation DR and RTK services, and is used to provide the vehicle's position, direction and speed, as well as precise timing.

[0053] It is understandable that the standby GNSS module can improve the reliability of the OBU positioning function, that is to say, as long as the standby GNSS module and the communication module have any normal positioning function, it can be ensured that the OBU has the demand of normal high-precision positioning. It should be noted that the data provided by the standby GNSS module can also be used to correct the positioning data provided by the communication module. In practical applications, the performance of the standby GNSS module is better than the GNSS function inside the communication module, and the cost is high. In some cases, the GNSS function inside the communication module can be used only without assembling the standby GNSS module on PCB1, thereby reducing the cost of the OBU.

[0054] It is understandable that, in order to realize the positioning function of the spare GNSS module, the PCB1 may further include an antenna ANT005 for connecting and matching with the spare GNSS module. The antenna ANT005 can send and receive signals.

[0055] Optionally, in this embodiment, the first printed circuit board PCB1 further includes: an indicator light, a button, an audio acquisition device and an audio output device. Among them, the second printed circuit board PCB2 further includes: a switch of the audio acquisition device, a power amplifier AMP and a codec Codec; the codec is connected to the communication module. As an example, the audio acquisition device can be a microphone, and the audio output device can be a speaker.

[0056] The indicator light and the button are used in conjunction with the E-CALL service in the T-BOX function, wherein the button is specifically used to switch or start the state of the E-CALL, and the indicator light is used to indicate the current state of the E-CALL. As an example, the on or off of the indicator light indicates different states of the E-CALL, or different colors of the indicator light indicate different states of the E-CALL.

[0057] In this embodiment, the button generates an input signal in response to the trigger of the pressing operation of the user in the car, and sends it to the MCU; the MCU is used to receive the input signal from the button and output an indication signal to the indicator light. Then, the indicator light lights up or displays different colors according to the indication signal.

[0058] The audio acquisition device is specifically used to acquire analog audio signals. As an example, the analog audio signal may be the voice of an emergency call. The switch MIC SWITCH of the audio acquisition device is used to switch the transmission direction of the analog audio signal. The switch MIC SWITCH of the audio acquisition device can be in two different states, which are referred to as the first state and the second state in this embodiment. When the switch MIC SWITCH of the audio acquisition device is in the first state, it is specifically used to transmit the analog audio signal to the codec; when the switch MIC SWITCH is in the second state, it is specifically used to send the analog audio signal to the vehicle computer.

[0059] As an example scenario, when the microphone of the vehicle computer fails or fails, the switch MIC SWITCH is manually set to the second state, and at this time, the vehicle computer can use the audio acquisition device of the vehicle-mounted unit to obtain the analog audio signal. In this scenario, the communication module does not obtain the audio signal, and the switch MIC SWITCH forwards the analog audio signal, specifically forwarding it to the vehicle computer, so that the vehicle computer uses the audio signal for corresponding processing and analysis.

[0060] The codec is used to perform analog / digital conversion on the analog audio signal collected by the audio collection device, that is, conversion from analog to digital, and transmit the converted digital audio signal to the communication module; the codec is also used to perform digital / analog conversion on the audio data to be played, that is, conversion from digital to analog, and send the converted audio data to the power amplifier AMP;

[0061] The power amplifier AMP is used to amplify the received audio data to drive the audio output device to play the amplified audio data.

[0062] Optionally, the first printed circuit board PCB1 also includes: a power management circuit and a backup battery (Backup Battery, BUB); the power management circuit is used to charge and manage the charging of the BUB, discharge and manage the discharge of the BUB, manage the switching of the main power supply BATT and the BUB, and supply and manage the power supply to the SOC, MCU and communication module.

[0063] exist Figure 2 In the OBU shown, the power management circuit is controlled by the MCU, and the MCU sends a power control signal to the power management circuit. In practical applications, the power management circuit may include two components, one of which is Figure 2 The other component is the "Power Management" shown in Figure 2 In the PMIC shown in the figure, "power management" is a special circuit composed of some devices, and PMIC is a chip. Among them, the power management can establish a connection with the main power supply and BUB, and can be powered by the main power supply BATT or the backup battery BUB. When the main power supply BATT supplies power to the power management, the diode between the main power supply BATT and the power management is turned on or conducted; when the BUB supplies power to the power management, the diode between the BUB and the power management is turned on or conducted. A power line is connected between the power management and the PMIC. The PMIC is dedicated to powering the SOC and peripherals such as the double-rate synchronous dynamic random access memory DDR SDRAM (DDR for short), and the non-volatile memory EMMC.

[0064] It should be noted that in actual applications, the backup battery BUB does not work in normal working scenarios; the backup battery BUB starts and works only when the main power supply BATT is abnormally disconnected or the voltage is too low. For example, when the vehicle collides, the backup battery BUB works.

[0065] There are multiple interfaces integrated on the SOC or MCU, including: USB hub, vehicle Ethernet interface, and CAN interface. Among them, the USB hub supports USB3.0; the vehicle Ethernet interface is compatible with 1000base-T1 and 100base-T1 interfaces; the CAN interface includes: CAN FD and CAN HS.

[0066] In addition, the SOC also includes reserved memory, such as Figure 2 8GB memory card shown in . It should be noted that the reserved memory is not limited to 8GB, but can also be 16GB, 32GB, 64GB, etc. Therefore, the specific size of the reserved memory is not limited here.

[0067] In addition, the communication module can also be inserted with a SIM card. Figure 2 As shown, the SIM card can be specifically inserted into the SIM card interface of the communication module. In practical applications, an eUICC type SIM card can also be used.

[0068] like Figure 2 As shown, the second printed circuit board PCB2 also includes: a six-axis sensor 6D, which specifically includes: a three-axis gyroscope and a three-axis accelerometer; the six-axis sensor 6D communicates with the communication module through an I2C interface or an SPI interface; the six-axis sensor 6D is used to send a posture wake-up signal to the MCU to wake up the MCU through the posture wake-up signal, and is also used to provide data input for inertial navigation (Dead Reckoning, DR). In addition, the communication module can also wake up the MCU through a text message, or wake up the MCU through an Ethernet physical layer (Ethernet PHY) network port.

[0069] The second printed circuit board PCB2 may also include: a WIFI and Bluetooth module connected to the communication module, and the WIFI and Bluetooth modules are used to establish a WIFI connection with other terminal devices and perform Bluetooth communication. It should be noted that the WIFI and Bluetooth modules are modules that integrate WIFI functions and Bluetooth functions, and the modules exist independently of the communication module. In this embodiment, the WIFI and Bluetooth modules can be connected to the communication module via a PCIE interface.

[0070] In this embodiment, the second printed circuit board PCB2 may further include: a radio frequency interface circuit. Figure 2 RF is used to represent it. The communication module and the external antenna are connected and matched through RF. Figure 2 As shown, there are four types of external antennas, namely:

[0071] The first antenna ANT001, the V2X antenna ANT002, the positioning antenna ANT003, and the WIFI and Bluetooth antenna ANT004.

[0072] When the OBU is used to implement 4G communication, the first antenna ANT001 specifically includes a 4G antenna; when the OBU is used to implement 5G communication, the first antenna ANT001 specifically includes a 5G antenna. Since the communication module can smoothly switch from 4G mode to 5G mode Pin to Pin, the first antenna ANT001 can include both a 4G antenna and a 5G antenna. The V2X antenna ANT002 corresponds to the implementation of the V2X communication function of the communication module. The positioning antenna ANT003 corresponds to the implementation of the high-precision positioning function of the communication module. The WIFI and Bluetooth antenna ANT004 ​​corresponds to the implementation of the corresponding functions of the WIFI and Bluetooth modules connected to the communication module.

[0073] In addition, the WIFI and Bluetooth modules can also be connected and matched with its internal WIFI and Bluetooth antenna ANT006.

[0074] In this embodiment, there is no limitation on the number of the first antenna ANT001, the V2X antenna ANT002, the positioning antenna ANT003, and the WIFI and Bluetooth antenna ANT004. As an example, in actual applications, two first antennas ANT001, two V2X antennas ANT002, one positioning antenna (i.e., GNSS antenna) ANT003, and one WIFI and Bluetooth antenna ANT004 ​​can be used. These antennas can respectively transmit and receive radio frequency signals.

[0075] like Figure 2 As shown, the first printed circuit board PCB1 may also include a clock chip RTC, a watchdog WatchDog and an electrically erasable read-only memory EEPROM. The clock chip RTC and the electrically erasable read-only memory EEPROM are respectively connected to the MCU via an I2C interface; the watchdog WatchDog is connected to the MCU via a general purpose input and output GPIO interface.

[0076] It can be seen from the OBU structure described above that the OBU provided in this embodiment has a very high degree of integration and can integrate T-BOX functions and V2X communication functions. In addition, the HSM makes the OBU more reliable in security.

[0077] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle-mounted unit, characterized in that: include: a first printed circuit board and a second printed circuit board; The first printed circuit board includes: a system on chip SOC and a microcontroller MCU; The SOC supports a protocol stack for V2X communication, and the SOC is used for sending and receiving data and performing data processing; The MCU is used to expand the communication interface, and the SOC or the MCU is integrated with at least one of the following: USB hub, vehicle Ethernet interface, CAN interface; The second printed circuit board includes: a communication module; The communication module is used to implement V2X communication and cellular communication, to locate the vehicle, and to support the function of T-BOX; the cellular communication includes at least: 4G communication and 5G communication; the communication module is compatible with supporting 4G communication and 5G communication in packaging; The first printed circuit board further includes: an indicator light, a button, an audio collection device and an audio output device; the second printed circuit board further includes: a switch, a power amplifier and a codec of the audio collection device; the codec is connected to the communication module; The indicator light and the button are used in conjunction with the E-CALL service in the function of the T-BOX, wherein the button is specifically used to switch or start the state of the E-CALL, and the indicator light is used to indicate the current state of the E-CALL; The MCU is used to output an indication signal to the indicator light and to receive an input signal from the button; The audio acquisition device is used to acquire analog audio signals; The switch of the audio acquisition device is used to switch the transmission direction of the analog audio signal. When the switch is in a first state, it is used to transmit the analog audio signal to the codec; when the switch is in a second state, it is used to send the analog audio signal to the vehicle computer; The encoder / decoder is used to perform analog / digital conversion on the analog audio signal collected by the audio collection device, and transmit the converted digital audio signal to the communication module; it is also used to perform digital / analog conversion on the audio data to be played, and send the converted audio data to the power amplifier; The power amplifier is used to amplify the received audio data to drive the audio output device to work.

2. The vehicle-mounted unit according to claim 1, characterized in that: The first printed circuit board further comprises: a hardware security module HSM; the HSM is connected to the SOC via an SPI interface, a USB interface or an SDIO interface; The hardware security module is used to sign the sent messages using an asymmetric encryption algorithm, verify the signatures of received messages, and store private keys.

3. The vehicle-mounted unit according to claim 1, characterized in that: The first printed circuit board also includes: a spare global satellite navigation system GNSS module, which is connected to the SOC via a universal asynchronous transceiver transmitter UART, supports centimeter-level precision positioning, and supports SBAS, DR and RTK services; the spare GNSS module is used to provide the vehicle's position, direction and speed, as well as timing.

4. The vehicle-mounted unit according to claim 1, characterized in that: The first printed circuit board also includes: a power management circuit and a backup battery BUB; the MCU is used to implement power management through the power management circuit; The power management circuit is used to charge and manage the charging of the BUB according to the control signal of the MCU, discharge and manage the discharge of the BUB, manage the switching between the main power supply and the BUB power supply, and supply and manage the power supply for the SOC, the MCU and the communication module.

5. The vehicle-mounted unit according to claim 1, characterized in that: The SOC also includes a reserved memory.

6. The vehicle-mounted unit according to claim 1, characterized in that: The second printed circuit board also includes: a six-axis sensor, which specifically includes: a three-axis gyroscope and a three-axis accelerometer; the six-axis sensor communicates with the communication module via an I2C interface or an SPI interface; the six-axis sensor is used to send a posture wake-up signal to the MCU to wake up the MCU, and is also used to provide data for inertial navigation.

7. The vehicle-mounted unit according to claim 1, characterized in that: The second printed circuit board also includes: a WIFI and Bluetooth module connected to the communication module, and the WIFI and Bluetooth module are used to establish a WIFI connection with other terminal devices and perform Bluetooth communication.

8. The vehicle-mounted unit according to claim 7, characterized in that: The second printed circuit board also includes: a radio frequency interface circuit for connecting and matching the communication module and the external antenna; the external antenna includes: A first antenna, a V2X antenna, a positioning antenna, and a WIFI and Bluetooth antenna; the first antenna includes a 4G antenna and / or a 5G antenna; the WIFI and Bluetooth antennas correspond to the WIFI and Bluetooth modules.

9. The vehicle-mounted unit according to any one of claims 1 to 8, characterized in that: The first printed circuit board and the second printed circuit board are two different parts of the same circuit board; or, the first printed circuit board and the second printed circuit board are connected via a flexible circuit board; or, the first printed circuit board and the second printed circuit board are connected via a board-to-board connector.

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