A vehicle-mounted Bluetooth connection system and method for connecting multiple terminal devices

Abstract

This invention belongs to the field of intelligent cockpit automotive technology, and discloses an in-vehicle Bluetooth connection system and method for connecting multiple terminal devices. The method includes: detecting whether the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if so, switching the connection between the target terminal device and the current terminal device through a target switching module; if not, connecting to the target terminal device until the preset value is reached; simultaneously, switching the terminal device functions according to the operating status of the current terminal device and the functional requests of the target terminal device, and displaying the results on the vehicle's infotainment display screen. This invention can connect multiple terminal devices through a Bluetooth connection module, and supports separate control of the connected terminal devices' telephone, music, and screen projection functions, meeting different user scenarios. Furthermore, this invention is characterized by low cost, suitability for various in-vehicle entertainment systems, and ease of promotion.

Description

Technical Field

[0001] This invention belongs to the field of intelligent cockpit automotive technology, and relates to an in-vehicle Bluetooth connection system and method for connecting multiple terminal devices. Background Technology

[0002] With the profound transformation of the automotive industry and the rapid development of automotive electronics technology, automobiles are no longer merely a means of transportation, but have gradually evolved into mobile living spaces integrating travel, entertainment, and work. As the core area of ​​this transformation, the car cabin is undergoing a comprehensive transformation from a traditional cockpit to an intelligent and digital cockpit, officially entering a new era of "cabin + electronic devices." This shift has not only greatly enriched in-vehicle functionality but also profoundly changed people's driving and riding experiences.

[0003] Within the architecture of an intelligent cockpit, seamless connectivity between smart terminals and the vehicle's infotainment system has become a key element in enhancing the driving experience. In-vehicle navigation, with its accurate and real-time traffic information, provides drivers with convenient and safe travel guidance; Bluetooth connectivity enables the sharing of functions such as voice calls and music playback between the phone and the vehicle, further enhancing interactivity and entertainment during the drive; and media playback functions, through a wealth of audio and video resources, meet the diverse entertainment needs of passengers. The realization of these functions all relies on the efficient connection between the smart terminal and the vehicle's infotainment system.

[0004] However, with the widespread adoption of smartphones, tablets, smartwatches, and other smart devices, and the increasing demand for personalized and diversified services, the traditional "one-to-one" connection method of smart car infotainment systems is clearly no longer sufficient to meet current market needs. In real-world scenarios, users may want to connect and use multiple devices simultaneously while driving, such as using one phone to play navigation information while using another to answer work calls, or even monitoring their health through a smartwatch. This demand for multi-device connectivity poses a significant challenge to existing smart car infotainment systems. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that existing intelligent vehicle systems can only connect to one intelligent terminal, which cannot meet the needs of users to connect multiple terminal devices. This invention provides an in-vehicle Bluetooth connection system and method for connecting multiple terminal devices.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] The present invention proposes an in-vehicle Bluetooth and multi-terminal device connection system, including a search module, a detection module, an alarm module, an in-vehicle display screen, a target switching module, and a function switching module;

[0008] The search module is used to search for target terminal devices that can be discovered within the effective range;

[0009] The detection module is used to detect whether the number of current vehicle Bluetooth connections to terminal devices has reached a preset value; if so, it sends a signal to the alarm module; if not, it connects to the target terminal device until the preset value is reached.

[0010] Both the alarm module and the target switching module are connected to the vehicle display screen. The vehicle display screen shows a pop-up window, which allows users to switch the connection between the target terminal device and the current terminal device through the target switching module.

[0011] The function switching module is connected to the vehicle display screen. The function switching module switches the terminal device functions according to the current operating status of the terminal device and the function request of the target terminal device, and displays the result on the vehicle display screen.

[0012] Preferably, the detection module is externally connected to a connection module. The connection module performs digital verification and pairing with the target terminal device to complete the connection between the vehicle Bluetooth and the target terminal device. The connection module generates a key, and the vehicle display shows a pairing prompt box, while requesting the user to verify the key on the target terminal device. If the verification is successful, the pairing connection is successful. If the verification fails, the verification is repeated or the next target terminal device is selected for verification.

[0013] Preferably, when pairing with a new terminal device, the connection module connects to either the HFP or A2DP protocol according to the user's selection; if the terminal device only allows connection to one protocol, then it connects to a terminal device that supports that protocol.

[0014] Preferably, the function switching module includes a screen mirroring switching module, a music switching module, and a phone switching module; the phone switching module is used to prompt the user to select the terminal device to be replaced when a new terminal device Bluetooth phone is connected after the maximum number of Bluetooth phone connections has been reached; the music switching module is used to prompt the user to disconnect the current terminal device and connect to the new terminal device Bluetooth music when a new terminal device Bluetooth music is connected while the current terminal device is connected; the screen mirroring switching module is used to connect a new terminal device for screen mirroring when the current terminal device is connected, and the user confirms to disconnect the current terminal device screen mirroring before screen mirroring to the new terminal device.

[0015] Preferably, the music switching module is used when a Bluetooth music function device is being connected and a new terminal device is being connected via Bluetooth music, and further includes: when the music switching module receives a connection request from the new terminal device, determining the type of the audio file when the new terminal device sends audio file data; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

[0016] Preferably, the target terminal device and the function switching module are connected via a wired data connection through USB.

[0017] Preferably, the target terminal device and the function switching module are connected wirelessly via WIFI.

[0018] A method for connecting in-vehicle Bluetooth to multiple terminal devices includes:

[0019] Search for target terminal devices that can be found within the effective search range;

[0020] Check if the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if yes, switch the connection between the target terminal device and the current terminal device; if no, connect to the target terminal device until the preset value is reached.

[0021] Based on the current operating status of the terminal device and the functional request of the target terminal device, the terminal device function is switched and displayed on the vehicle display screen.

[0022] Preferably, the connection to the target terminal device specifically involves: when pairing and connecting a new terminal device, connecting to either the HFP or A2DP protocol according to the user's selection; if the terminal device only allows connection to one protocol, then connecting to a terminal device that supports that protocol.

[0023] Preferably, the step of switching terminal device functions based on the current terminal device's operating status and the target terminal device's functional request specifically involves: when the number of Bluetooth phone devices connected reaches its maximum value, and a new Bluetooth phone terminal device is connected, the vehicle's display screen prompts the user to select the terminal device to be replaced; when a Bluetooth music device is connected, and a new Bluetooth music terminal device is connected, the vehicle's display screen prompts the user to disconnect the current terminal device and connect to the new terminal device's Bluetooth music; when the current terminal device is connected for screen mirroring, and a new terminal device is connected for screen mirroring, and the user confirms disconnecting the current terminal device's screen mirroring, screen mirroring is performed on the new terminal device; when a connection request from a new terminal device is received, the type of the audio file sent by the new terminal device is determined; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention proposes a vehicle-mounted Bluetooth and multi-terminal device connection system. It detects whether the number of connected terminal devices via Bluetooth has reached a preset value. If so, a target switching module switches the connection between the current terminal device and the target terminal device. If not, it connects to the target terminal device until the preset value is reached. Simultaneously, based on the operating status of the current terminal device and the functional requests of the target terminal device, it switches the terminal device functions and displays the results on the vehicle's infotainment screen. This invention can connect multiple terminal devices via Bluetooth and supports separate control of the connected terminal devices' phone calls, music playback, and screen mirroring functions, meeting diverse user scenarios. Furthermore, this invention is low-cost, suitable for various in-vehicle entertainment systems, and easy to promote.

[0026] Furthermore, the digital verification pairing and key verification mechanism ensures that the in-vehicle Bluetooth system only connects to authorized target terminal devices. This dual verification method significantly enhances the security of data transmission, preventing unauthorized access and data leakage risks. Displaying a pairing prompt on the vehicle's screen and requesting the user to verify the key on the target terminal device makes the entire pairing process more intuitive and user-friendly. Users can clearly see the current pairing status and perform corresponding operations according to the prompts, thus simplifying the pairing process and improving the user experience. The key verification mechanism not only enhances security but also increases the probability of successful pairing by ensuring that both devices correctly identify and confirm each other's identities. Even in complex or highly interference-prone environments, it effectively avoids pairing failures caused by signal interference or misoperation. This mechanism supports re-verification or selecting the next target terminal device for verification in case of verification failure, providing users with greater flexibility and convenience. Users can easily switch or add new target terminal devices as needed, achieving seamless connection and management between multiple devices.

[0027] Furthermore, users can choose to connect to either the HFP or A2DP protocol based on their actual needs. The HFP protocol is primarily used for hands-free calling, while the A2DP protocol focuses on high-quality audio transmission. These two protocols ensure that users can choose the most suitable connection method according to their usage scenario. By supporting both HFP and A2DP, the connectivity module is compatible with the vast majority of smart terminal devices on the market. When a terminal device only allows connection to one protocol, the connectivity module can intelligently identify and connect to terminal devices that support that protocol, ensuring connection stability and reliability. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the vehicle-mounted Bluetooth and multi-terminal device connection system of the present invention.

[0030] Among them, 1-search module; 2-detection module; 3-alarm module; 4-vehicle display screen; 5-connection module; 6-screen projection switching module; 7-music switching module; 8-telephone switching module; 9-target switching module. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings:

[0038] This invention proposes a vehicle-mounted Bluetooth connection system for multiple terminal devices, such as... Figure 1 As shown, it includes a search module 1, a detection module 2, an alarm module 3, a vehicle display screen 4, a target switching module 9, and a function switching module;

[0039] Search module 1 is used to search for target terminal devices that can be found within the effective range; detection module 2 is used to detect whether the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if yes, a signal is sent to alarm module 3; if no, the target terminal device is connected until the preset value is reached; alarm module 3 and target switching module 9 are both connected to the vehicle display screen 4, and the vehicle display screen 4 displays a pop-up window to facilitate users to switch the connection between the target terminal device and the current terminal device through the target switching module 9; function switching module is connected to vehicle display screen 4, and the function switching module switches the terminal device function according to the current terminal device's operating status and the target terminal device's function request, and displays it on vehicle display screen 4.

[0040] The detection module 2 is connected to the external connection module 5. The connection module 5 performs digital verification and pairing with the target terminal device. The connection module 5 generates a key, and the vehicle display screen shows a pairing prompt box, while requesting the user to verify the key on the target terminal device. If the verification is successful, the pairing and connection are successful. If the verification fails, the verification is performed again or the next target terminal device is selected for verification.

[0041] The function switching module includes a screen mirroring switching module 6, a music switching module 7, and a phone switching module 8. The phone switching module 8 is used to prompt the user on the vehicle's display screen 4 to select the terminal device to be replaced when a new Bluetooth phone terminal device is connected after the maximum number of connected Bluetooth phone devices has been reached. The music switching module 7 is used to prompt the user on the vehicle's display screen 4 to disconnect the current terminal device and connect to the new terminal device when a new Bluetooth music terminal device is connected while the current terminal device is already connected for screen mirroring. The screen mirroring switching module 6 is used to connect a new terminal device for screen mirroring when the user confirms disconnecting the current terminal device for screen mirroring, and then perform screen mirroring on the new terminal device.

[0042] The music switching module 7 is used when a Bluetooth music function device is being connected and a new terminal device is being connected via Bluetooth music. It further includes: when the music switching module 7 receives a connection request from the new terminal device, it determines the type of the audio file when it receives the audio file data sent by the new terminal device; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

[0043] The target terminal device and the function switching module establish a wired data connection via USB. Alternatively, they can establish a wireless data connection via Wi-Fi.

[0044] When pairing with a new terminal device, the connection module 5 connects to either the HFP or A2DP protocol depending on the user's choice; if the terminal device only allows connection to one protocol, it connects to a terminal device that supports that protocol.

[0045] A method for connecting in-vehicle Bluetooth to multiple terminal devices includes:

[0046] Search for target terminal devices that can be found within the effective search range;

[0047] Check if the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if yes, switch the connection between the target terminal device and the current terminal device; if no, connect to the target terminal device until the preset value is reached.

[0048] Based on the current operating status of the terminal device and the functional request of the target terminal device, the terminal device function is switched and displayed on the vehicle display screen.

[0049] Connecting to the target terminal device specifically involves: when pairing and connecting a new terminal device, connecting to either the HFP or A2DP protocol based on the user's choice; if the terminal device only allows connection to one protocol, then connecting to a terminal device that supports that protocol.

[0050] Based on the current operating status of the terminal device and the functional request of the target terminal device, the terminal device function is switched. Specifically: when the number of Bluetooth phone devices connected reaches the maximum value, when connecting a new Bluetooth phone terminal device, the vehicle display screen 4 prompts the user to select the terminal device to be replaced; when a Bluetooth music device is connected, when connecting a new Bluetooth music terminal device, the vehicle display screen 4 prompts the user to disconnect the current terminal device and connect to the new Bluetooth music terminal device; when the current terminal device is connected for screen mirroring, when connecting a new terminal device for screen mirroring, and the user confirms disconnecting the current terminal device for screen mirroring, screen mirroring is performed on the new terminal device; when a connection request is received from a new terminal device, the type of audio file sent by the new terminal device is determined; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

[0051] Example:

[0052] The terminal device can be a mobile phone, tablet, smart bracelet, or other smart device. According to an embodiment of the present invention, the in-vehicle Bluetooth connection method with multiple terminal devices is applied to an in-vehicle infotainment system, including: the in-vehicle infotainment system can connect individually to several mobile phones via connection module 5, wherein the number of mobile phones is set to 3; after the in-vehicle infotainment system connects to the mobile phones, its Bluetooth phone, Bluetooth music, and screen mirroring functions can be controlled separately. The overall principle for enabling these functions is that a maximum of two Bluetooth phone functions can be enabled, one Bluetooth music function can be enabled, and different screen mirroring functions are mutually exclusive, with the specific rules as follows:

[0053] (1) When there are two Bluetooth phone phones connected, when connecting a new Bluetooth phone, the system prompts the user to select the phone to be replaced.

[0054] (2) When there is currently one mobile phone screen mirroring and one Bluetooth phone connected, if a new Bluetooth phone is connected, the current Bluetooth phone will be disconnected directly. When connecting a new Bluetooth phone, the user will be prompted to connect to the phone.

[0055] (3) When there is a Bluetooth music function phone connected, and a new phone Bluetooth music is connected, after the user confirms, the current phone Bluetooth music connection is disconnected and the new Bluetooth music phone is connected.

[0056] (4) When there are two Bluetooth phone phones connected, when connecting a new device to the screen mirroring function, a pop-up window should be made to allow the user to choose which phone to replace;

[0057] (5) When there is currently one screen mirroring function connected, if a new screen mirroring function is connected, a pop-up window should be made to ask the user to confirm whether to disconnect the current screen mirroring function connected phone.

[0058] (6) When there is currently one screen mirroring phone, one Bluetooth phone and one Bluetooth music phone connected, a pop-up window should be displayed to allow the user to confirm disconnection when a new phone is connected.

[0059] Another embodiment of the present invention provides an in-vehicle Bluetooth and multi-terminal device connection system, including a search module 1, a detection module 2, an alarm module 3, an in-vehicle display screen 4, a target switching module 9, and a function switching module;

[0060] Search module 1 is used to search for target terminal devices that can be found within the effective range; detection module 2 is used to detect whether the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if yes, a signal is sent to alarm module 3; if no, the target terminal device is connected until the preset value is reached; alarm module 3 and target switching module 9 are connected to the vehicle display screen 4, and the vehicle display screen 4 displays a pop-up window to facilitate users to switch the connection between the target terminal device and the current terminal device through the target switching module 9; function switching module is connected to the vehicle display screen 4, and the function switching module switches the terminal device function according to the current terminal device's operating status and the target terminal device's function request, and displays it on the vehicle display screen 4.

[0061] When connecting to a target terminal device, the mobile phone is paired and connected via connection module 5. Two-way pairing is supported, meaning the mobile phone can be paired with the vehicle's infotainment system directly, or the mobile phone can be selected for pairing within the vehicle's infotainment system. During the digital verification pairing process, connection module 5 generates a 6-digit key, and the vehicle's main unit displays a pairing prompt, requesting the user to verify the key. When pairing with a new terminal device, the user selects either the HFP or A2DP protocol. If the remote device only allows one protocol, only terminal devices supporting that protocol will be connected. The vehicle's infotainment system allows users to switch between devices in the pairing list. If a device is already connected, clicking on another device to connect will disconnect the current terminal device before connecting to the target terminal device if the connection reaches its functional limit. Bluetooth phone calls, Bluetooth music, and screen mirroring from devices in the pairing list are supported; if the connection fails, it will automatically reconnect.

[0062] The function switching module includes a screen mirroring switching module 6, a music switching module 7, and a phone switching module 8. The phone switching module 8 is used to prompt the user on the vehicle's display screen 4 to select the terminal device to be replaced when a new Bluetooth phone terminal device is connected after the maximum number of connected Bluetooth phone devices has been reached. The music switching module 7 is used to prompt the user on the vehicle's display screen 4 to disconnect the current terminal device and connect to the new terminal device when a new Bluetooth music terminal device is connected while the current terminal device is already connected for screen mirroring. The screen mirroring switching module 6 is used to connect a new terminal device for screen mirroring when the user confirms disconnecting the current terminal device for screen mirroring, and then perform screen mirroring on the new terminal device.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle-mounted Bluetooth connection system for multiple terminal devices, characterized in that, It includes a search module (1), a detection module (2), an alarm module (3), a vehicle display screen (4), a target switching module (9), and a function switching module; The search module (1) is used to search for target terminal devices that can be discovered within the effective range; The detection module (2) is used to detect whether the number of current vehicle Bluetooth connections to the terminal device has reached a preset value; if yes, it sends a signal to the alarm module (3); if no, it connects to the target terminal device until the preset value is reached. Both the alarm module (3) and the target switching module (9) are connected to the vehicle display screen (4). The vehicle display screen (4) displays a pop-up window, which allows users to switch the connection between the target terminal device and the current terminal device through the target switching module (9). The function switching module is connected to the vehicle display screen (4). The function switching module switches the terminal device functions according to the current operating status of the terminal device and the function request of the target terminal device, and displays the switch on the vehicle display screen (4).

2. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 1, characterized in that, The detection module (2) is connected to an external connection module (5). The connection module (5) performs digital verification and pairing with the target terminal device to complete the connection between the vehicle Bluetooth and the target terminal device. The connection module (5) generates a key, and the vehicle display screen (4) displays a pairing prompt box, while requesting the user to verify the key on the target terminal device. If the verification is successful, the pairing and connection will be successful; if the verification fails, the verification will be performed again or the next target terminal device will be selected for verification.

3. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 2, characterized in that, When pairing and connecting a new terminal device, the connection module (5) connects to either the HFP or A2DP protocol according to the user's selection; if the terminal device only allows connection to one protocol, it connects to a terminal device that supports that protocol.

4. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 1, characterized in that, The function switching module includes a screen projection switching module (6), a music switching module (7), and a phone switching module (8). The phone switching module (8) is used to prompt the user to select the terminal device to be replaced when a new terminal device Bluetooth phone is connected after the number of Bluetooth phone devices connected reaches the maximum value. The music switching module (7) is used to prompt the user to disconnect the current terminal device and connect to the new terminal device Bluetooth music when a new terminal device Bluetooth music is connected after the Bluetooth music function device is connected. The screen projection switching module (6) is used to connect a new terminal device screen projection when the current terminal device screen projection is connected, and the user confirms to disconnect the current terminal device screen projection and then screen projection to the new terminal device.

5. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 4, characterized in that, The music switching module (7) is used to connect a new terminal device Bluetooth music when the Bluetooth music function device is already connected. It also includes: when the music switching module (7) receives a request from the new terminal device to connect, it determines the type of the audio file when it receives the data of the audio file sent by the new terminal device; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

6. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 1, characterized in that, The target terminal device and the function switching module are connected via a wired data connection through USB.

7. The in-vehicle Bluetooth and multi-terminal device connection system according to claim 1, characterized in that, The target terminal device and the function switching module are connected wirelessly via WIFI.

8. A method for connecting in-vehicle Bluetooth with multiple terminal devices, characterized in that, The in-vehicle Bluetooth and multi-terminal device connection system according to any one of claims 1 to 7 includes: Search for target terminal devices that can be found within the effective search range; Check if the number of current in-vehicle Bluetooth connections to terminal devices has reached a preset value; if yes, switch the connection between the target terminal device and the current terminal device; if no, connect to the target terminal device until the preset value is reached. Based on the current operating status of the terminal device and the functional request of the target terminal device, the terminal device function is switched and displayed on the vehicle display screen (4).

9. The method for connecting vehicle-mounted Bluetooth with multiple terminal devices according to claim 8, characterized in that, The connection to the target terminal device specifically involves: when pairing and connecting a new terminal device, connecting to either the HFP or A2DP protocol according to the user's selection; if the terminal device only allows connection to one protocol, then connecting to a terminal device that supports that protocol.

10. The method for connecting vehicle-mounted Bluetooth with multiple terminal devices according to claim 8, characterized in that, The method of switching terminal device functions based on the current terminal device's operating status and the target terminal device's function request is as follows: When the number of Bluetooth phone devices connected reaches the maximum value, when connecting a new terminal device Bluetooth phone, the vehicle display screen (4) prompts the user to select the terminal device to be replaced; when the Bluetooth music function device is connected, when connecting a new terminal device Bluetooth music, the vehicle display screen (4) prompts to disconnect the current terminal device and connect to the new terminal device Bluetooth music; when the current terminal device is connected for screen mirroring, when connecting a new terminal device for screen mirroring, and the user confirms disconnecting the current terminal device for screen mirroring, screen mirroring is performed on the new terminal device; when a request to connect to a new terminal device is received, the type of audio file is determined when judging the data of the audio file sent by the new terminal device; if the audio file is a non-music audio file, the non-music audio file is played through the terminal device.

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