An automatic control system for electric doors based on Bluetooth connection status triggering

Abstract

This invention relates to the field of automatic control technology for electric doors, specifically to an automatic control system for electric doors based on Bluetooth connection status triggering. The system includes: a Bluetooth module for establishing a Bluetooth connection with a vehicle or mobile terminal and monitoring the connection status in real time; a relay control module connected to the Bluetooth module for continuously sending an opening control signal to the door control module during the Bluetooth connection; and a door control module that receives drive signals from the relay control module and controls the electric door motor to perform opening or closing actions. When the Bluetooth connection is interrupted, the relay control module immediately cuts off the output of the opening control signal and triggers a closing control signal. This invention solves the core problems of low security, response delay, and high cost in existing door control technologies through a hard-link logic of Bluetooth connection status and physical power failure. It is particularly suitable for scenarios with stringent security and real-time requirements, such as underground parking garages and villas, and possesses significant technological advancement and market competitiveness.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for electric doors, and more specifically, to an automatic control system for electric doors based on Bluetooth connection status triggering. Background Technology

[0002] In recent years, Bluetooth technology has been widely used in smart access control systems, especially in scenarios such as garage doors and villa doors, allowing users to enter and exit without keys via their mobile phones or vehicle Bluetooth. Currently, most mainstream Bluetooth door control solutions employ a single-trigger + state-based self-locking mechanism, with a typical workflow as follows:

[0003] When connected via Bluetooth, a single door opening command is sent to drive the motor or electromagnetic lock to open the door. The door is then kept open by mechanical structure or electronic self-locking circuit.

[0004] The door closing is triggered by additional conditions, such as: triggering the door to close after detecting the user leaving via an infrared sensor; setting a countdown timer so that the door automatically closes after a delay after being opened; or the user manually closing the door by sending a second Bluetooth command.

[0005] However, the above solution has the following technical drawbacks:

[0006] Firstly, the level of automation is low: users need to manually trigger the door to close or rely on sensor detection, which cannot achieve "seamless passage". At the same time, the countdown mechanism cannot adapt to dynamic scenarios (such as short-term user stays) and the time parameters need to be adjusted repeatedly.

[0007] Secondly, there are insufficient security issues: mechanical self-locking mechanisms may fail due to aging or external impact, leading to accidental opening of the door; software-controlled closing actions may be bypassed due to system crashes, network delays, or hacker attacks.

[0008] Third, response delay: Sensor detection or countdown mechanisms cause a delay in the closing action, posing a risk of tailgating and intrusion;

[0009] Fourth, high cost and complexity: It requires the integration of additional hardware such as sensors and timing modules, which increases system cost and potential failure points;

[0010] Fifth, weak anti-interference capability: When the Bluetooth signal is interfered with by the 2.4GHz band, it may lead to misjudgment or connection interruption.

[0011] Therefore, an automatic control system for electric doors based on Bluetooth connection status is proposed. Summary of the Invention

[0012] The purpose of this invention is to provide an automatic control system for electric doors based on Bluetooth connection status triggering, so as to solve the problems of low automation, insufficient security, response delay, high cost and complexity, and weak anti-interference in existing automatic control systems for electric doors based on Bluetooth connection status triggering.

[0013] To solve the above-mentioned technical problems, the present invention provides an automatic control system for electric doors based on Bluetooth connection status triggering, applied to electric door control scenarios, including:

[0014] The Bluetooth module is used to establish a Bluetooth connection with the vehicle or mobile terminal and monitor the connection status in real time.

[0015] The relay control module is connected to the Bluetooth module and continuously sends door opening control signals to the door control module during the Bluetooth connection.

[0016] The door control module receives drive signals from the relay control module and controls the electric door motor to perform opening or closing actions; wherein, when the Bluetooth connection is interrupted, the relay control module immediately cuts off the output of the opening control signal and triggers the closing control signal.

[0017] As a further improvement to this technical solution, the Bluetooth module is a low-power Bluetooth module, and the Bluetooth connection is determined to be valid when either the signal strength threshold or the preset distance threshold is met.

[0018] As a further improvement to this technical solution, the Bluetooth module integrates an authentication unit, which establishes a connection only when an authorized vehicle Bluetooth MAC address or a unique identifier of a mobile terminal device is recognized.

[0019] As a further improvement to this technical solution, the Bluetooth module includes a priority connection logic unit. When multiple authorized Bluetooth devices are detected simultaneously, the priority connection logic unit responds to a preset master device signal and switches to a backup device to maintain the connection after the master device disconnects.

[0020] As a further improvement to this technical solution, the Bluetooth module includes an interference subunit. The interference subunit scans the 2.4GHz frequency band using dynamic frequency selection technology and automatically switches to an idle channel to avoid channel conflicts with Wi-Fi or microwave devices.

[0021] As a further improvement to this technical solution, the relay control module includes a delay subunit, which is used to delay the triggering of the door closing control signal for a preset time after the Bluetooth connection is interrupted.

[0022] As a further improvement to this technical solution, the relay control module adopts a normally closed relay, which remains energized and engaged during Bluetooth connection to maintain the door opening signal, and automatically resets to the power-off state after Bluetooth disconnection to trigger the door closing.

[0023] As a further improvement to this technical solution, the Bluetooth module and the relay control module adopt a dynamic power consumption adjustment protocol, which reduces the signal transmission frequency to a preset Hz after the Bluetooth connection is stable in order to save energy.

[0024] As a further improvement to this technical solution, the door control module includes a status indicator unit, which uses LED lights or a buzzer to indicate the current Bluetooth connection status and the door's movement progress.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In this automatic control system for electric doors triggered by Bluetooth connection status, the opening and closing of the electric door can be directly and automatically controlled by connecting and disconnecting Bluetooth, thus eliminating the need for manual control of the electric door opening and closing. Compared with existing opening and closing methods, this is more efficient and convenient.

[0027] 2. In this automatic control system for electric doors triggered by Bluetooth connection status, the relay directly cuts off the power supply after the Bluetooth connection is interrupted, and the door closes immediately, avoiding the risk of mechanical self-locking failure or software vulnerability. At the same time, it is suitable for high-security scenarios such as basements and villas, avoiding the tailgating hazard caused by door closing delay in traditional solutions.

[0028] 3. In this automatic control system for electric doors triggered by Bluetooth connection status, by setting priority connection logic units and status indication units, when multiple vehicles enter and exit the underground parking garage, the main device automatically switches to the backup device signal after leaving, avoiding frequent opening and closing of the door. LEDs / buzzers indicate connection and door actions, improving user experience and operational transparency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all secondary embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Currently, Bluetooth technology is widely used in smart access control systems, especially in scenarios such as garage doors and villa doors, where users can achieve keyless entry and exit via their mobile phones or vehicle Bluetooth. Existing technologies, most mainstream Bluetooth door control solutions employ a single-trigger + state-based self-locking mechanism, but these suffer from technical drawbacks such as low automation, insufficient security, response delay, high cost and complexity, and weak anti-interference capabilities.

[0032] In view of this, please refer to Figure 1 As shown, the purpose of this invention is to provide an automatic control system for electric doors triggered by Bluetooth connection status. This automatic control system for electric doors, applied in electric door control scenarios, includes:

[0033] The Bluetooth module is used to establish a Bluetooth connection with the vehicle or mobile terminal and monitor the connection status in real time.

[0034] The relay control module is connected to the Bluetooth module and continuously sends door opening control signals to the door control module during the Bluetooth connection.

[0035] The door control module receives drive signals from the relay control module and controls the electric door motor to perform opening or closing actions. When the Bluetooth connection is interrupted, the relay control module immediately cuts off the output of the opening control signal and triggers the closing control signal.

[0036] This automatic control system for electric doors, triggered by Bluetooth connection status, can directly and automatically control the opening and closing of the electric door by connecting and disconnecting via Bluetooth, eliminating the need for manual control. Compared to existing opening and closing methods, this system is more efficient and convenient. When the Bluetooth connection is interrupted, the relay directly cuts off the power supply, and the door closes immediately, avoiding the risks of mechanical self-locking failure or software vulnerabilities. It is suitable for high-security scenarios such as underground parking garages and villas, avoiding the tailgating hazard caused by delayed closing in traditional solutions. Furthermore, by setting priority connection logic units and status indicator units, when multiple vehicles enter and exit the underground parking garage, the system automatically switches to the backup device signal after the main device leaves, preventing frequent door opening and closing. LEDs / buzzers indicate connection status and door actions, improving user experience and operational transparency.

[0037] Considering that traditional Bluetooth modules (such as Classic Bluetooth) have high power consumption, making it difficult to meet the long standby power requirements of basement / villa access control systems, and also have limitations in multi-platform compatibility, the Bluetooth module is a low-power Bluetooth module, using the Bluetooth Low Energy protocol (BLE 5.0 and above). BLE standby power consumption is only 0.01-0.5mA, which is a significant improvement compared to the 1-30mA of traditional Bluetooth. At the same time, BLE supports iOS / Android devices and in-vehicle Bluetooth systems (such as Tesla and BMW iDrive), ensuring seamless cross-terminal compatibility.

[0038] In complex environments such as metal electric doors and multi-obstacle parking garages, relying solely on signal strength (RSSI) is prone to misjudgment due to multipath reflection and signal attenuation (e.g., a weak signal of -80dBm triggering the door to open). Relying solely on a fixed distance threshold cannot accommodate the differences in Bluetooth transmission power between different vehicles (e.g., electric vehicles typically have a Bluetooth power of +4dBm, while gasoline vehicles have 0dBm), leading to insufficient reliability of the control logic. Therefore, a dual-mode triggering logic is adopted, simultaneously satisfying either of the following conditions to determine a valid Bluetooth connection: Signal strength threshold: RSSI ≥ -70dBm (effectively filtering weak signal interference caused by wall obstructions); Dynamic distance threshold: Based on the Bluetooth 5.1 angle of arrival (AoA) / angle of departure (AoD) ranging algorithm, a 10-meter effective triggering range is set (±0.3-meter accuracy), with real-time spatial distance calibration. Through the dual-mode triggering logic, connection stability is improved in environments with metal doors and multi-obstacle parking garages, while also being compatible with the differences in Bluetooth transmission power between different vehicles (e.g., electric vehicles and gasoline vehicles), enhancing scenario adaptability.

[0039] Traditional Bluetooth gate systems rely on app dynamic codes or password verification, which has the following drawbacks: First, the success rate of man-in-the-middle (MITM) attacks is as high as 35% (based on Shodan test data), allowing hackers to intercept Bluetooth communication data packets and forge authorization signals. Second, unauthorized devices can impersonate authorized devices by randomizing MAC addresses (such as iOS private addresses), resulting in a high rate of spoofing. Third, users must manually open the app for verification each time they pass through, taking an average of 5.3 seconds (average of iOS / Android tests), leading to a fragmented user experience. Therefore, the Bluetooth module integrates an authentication unit, establishing a connection only when an authorized vehicle Bluetooth MAC address or a unique identifier for the mobile terminal device is recognized. By using a pre-authorized vehicle Bluetooth MAC address (such as 00:1A:7D:DA:71:13 in Tesla Model Y) or a fixed identifier from a mobile phone (such as an iPhone Bluetooth address), device signature verification (such as the ECDSA algorithm) is required during connection to prevent one-way authentication from being bypassed. Simultaneously, the device unique identifier can be extended; for example, iOS devices can extract a "custom device fingerprint" (such as DeviceCheck) from Apple advertising data. The unique ID generated by the API can be combined with the Bluetooth address and the device hardware serial number (such as IMEI) to generate a composite identifier. This composite identifier must satisfy both the address and the hardware fingerprint, making the access rate of unauthorized devices almost zero. Moreover, users do not need to do anything; they can bring an authorized device close and it will be automatically verified, improving passage efficiency.

[0040] In scenarios with multiple devices coexisting in basements or villas, traditional Bluetooth door control systems suffer from three major drawbacks: First, multiple devices simultaneously initiating connection requests (e.g., 3 cars + 2 mobile phones in a household) leads to frequent opening and closing of the door per hour, shortening the motor's lifespan. Second, visitor devices can momentarily seize control due to a temporary advantage in signal strength (RSSI), obstructing the owner's passage. Third, after the primary device (e.g., the owner's vehicle) leaves, the backup device needs to manually reconnect (averaging 5 seconds), increasing the risk of accidental door closure and injury. Therefore, the Bluetooth module includes a priority connection logic unit. When multiple authorized Bluetooth devices are detected simultaneously, the priority connection logic unit responds to the preset primary device signal and switches to the backup device to maintain the connection after the primary device disconnects. Specifically, the owner's vehicle / mobile phone is set to the highest priority (Priority 1), and the backup device (e.g., the visitor's mobile phone) is set to the second highest priority (Priority 2). Based on a comprehensive score of Bluetooth signal strength (RSSI), connection stability (packet loss rate), and device movement speed (Doppler shift), the device is prioritized in the second highest priority (Priority 2). 2) Select the optimal device; when the main device signal disappears, the system detects the disconnection within 100ms and automatically switches to the backup device; the backup device continuously scans the main device signal during the connection period, and immediately switches back to the main connection once the main device returns; through this technology, when multiple devices coexist, only the device with the highest priority is responded to, the door remains open, the motor life is extended, and the owner's device always has priority to pass through, preventing visitor devices from taking over control. At the same time, after the main device leaves, the backup device quickly takes over to prevent the door from closing unexpectedly.

[0041] In environments such as basements and villas, the 2.4GHz band is densely populated with devices (Wi-Fi cameras, wireless remote controls, microwave radar). Traditional Bluetooth modules, using fixed channels, are susceptible to interference. For example, Wi-Fi channels (such as 1 / 6 / 11) partially overlap with Bluetooth channels (0-79), leading to increased packet loss rates. Devices like microwave ovens and wireless doorbells temporarily occupy the entire band, causing intermittent Bluetooth connections. The metal material of basement electric doors exacerbates signal reflection, resulting in significant multipath interference. Therefore, Bluetooth modules include an interference subunit. This subunit uses dynamic frequency selection technology to scan the 2.4GHz band and automatically switches to an idle channel, avoiding interference with Wi-Fi or other devices. Channel conflict in microwave equipment; specifically: real-time monitoring of the 2.4GHz band (2402-2480MHz), identifying the signal strength and occupancy rate of each sub-channel, distinguishing Wi-Fi signals (20MHz bandwidth), Bluetooth signals (1MHz), and microwave pulses (full-band transient) using FFT (Fast Fourier Transform), identifying interference sources, avoiding the main channel occupied by Wi-Fi (such as 1 / 6 / 11), switching to idle sub-channels (such as 15 / 20 / 25), and pausing transmission for 50ms and retrying when transient interference from the microwave oven is detected to avoid continuous collisions; thereby reducing the number of accidental door closing events caused by interference and the data packet loss rate;

[0042] Because Bluetooth connections may be unintentionally lost due to short-term signal interference (such as human obstruction or sudden Wi-Fi interference) or users briefly leaving the coverage area (such as briefly stopping at a parking garage entrance), immediately triggering a door-closing action would cause the following problems: First, the door may accidentally close, potentially injuring the user or vehicle (e.g., while a driver is getting in or out of their car); second, frequent false triggers would shorten the lifespan of components such as motors and relays; and third, users would need to repeatedly trigger the door to open, impairing smooth passage and reducing user experience. Therefore, the relay control module includes a delay subunit, which is used to handle Bluetooth connection interruptions. The door closing control signal is triggered after a preset delay. Specifically, based on the RC charging and discharging principle or a digital timer (such as a 555 chip / TIM microcontroller module), a delay time (adjustable from 0 to 10 seconds) is set. After Bluetooth disconnection, a countdown begins. If the connection is successfully reconnected within the delay period, the door closing command is canceled. At the same time, the delay is automatically extended (e.g., from 2 seconds to 5 seconds) based on the historical frequency of false triggers (e.g., more than 3 false triggers in the past hour). This reduces the number of false door closings caused by short-term interference, keeping the door open during short periods of user stay (e.g., moving items), reducing the risk of being pinched.

[0043] Traditional door control systems use normally open relays, which require continuous power to maintain the open state. This presents several problems: First, if the system power supply is interrupted (e.g., power failure, battery depletion), the normally open relay resets to the open state, causing the door to close unexpectedly and potentially trapping people or vehicles. Second, maintaining the open state requires continuous power to the relay coil (typical power consumption 0.5-2W), increasing the workload on battery-powered systems. Third, normally open relays are prone to failure due to contact oxidation during frequent engagement and disengagement. Therefore, the relay control module uses normally closed relays. During Bluetooth connection, the relay remains energized and engaged to maintain the open signal, and automatically resets to the de-energized state after Bluetooth disconnection to trigger the closing. Specifically: during Bluetooth connection, power is supplied to the relay coil → contacts open. Open → The door control module receives a continuous high-level signal → drives the electric door to open and maintain its position; When Bluetooth is disconnected or power is lost: The relay coil is de-energized → The contacts automatically close → The door control module receives a low-level signal → Immediately triggers the door closing action. This technical solution ensures that any system power outage (including malicious damage) will trigger door closing, improving safety. The normally closed relay only needs power during Bluetooth connection and consumes zero power after disconnection. Simultaneously, the contacts only open during Bluetooth connection and close naturally after disconnection, reducing the number of actions and extending mechanical lifespan. Through the technical combination of normally closed relay reverse control, fail-safe hardware binding, and contact reinforcement technology, this embodiment achieves an absolute safety mechanism of "closing the door upon power failure," while significantly reducing energy consumption and extending equipment lifespan. It is particularly suitable for scenarios with stringent safety and reliability requirements, such as basements and villas, solving the industry pain points of traditional solutions relying on software logic and being susceptible to power outages, providing a hardware-level safety benchmark for intelligent door control systems.

[0044] Traditional Bluetooth protocol stacks cannot enter deep sleep mode during the connection maintenance phase, resulting in high static power consumption. Therefore, a dynamic power consumption adjustment protocol is used between the Bluetooth module and the relay control module. After the Bluetooth connection is stable, the signal transmission frequency is reduced to a preset Hz (e.g., 1Hz) to save energy. Specifically, after the connection is stable, the Bluetooth module enters a "sleep mode," waking up every 100ms for 2ms to check the channel status and reserving a dedicated broadcast channel (Advertising Channel). 39) Emergency commands (such as door closing trigger) can immediately wake up the module, packaging multiple control commands into a single data packet for transmission, reducing the number of RF activations. Considering that excessive frequency reduction may lead to signal delay or connection loss, causing malfunctions, a dual-threshold fault-tolerance mechanism is added to the dynamic power consumption adjustment protocol. Specifically, if packets are lost for three consecutive cycles, the frequency is automatically increased to the next higher level. When RSSI < -80dBm, frequency backoff is triggered and a signal enhancement mode is activated (such as increasing the transmit power to +4dBm). Reed-Solomon encoding is introduced in low-frequency communication, improving error correction capability to 3 bits per packet. Through the combination of adaptive frequency adjustment, protocol stack sleep optimization, and dual-threshold fault tolerance, this embodiment reduces system power consumption while ensuring real-time and reliable communication, resolving the long-standing contradiction of "high power consumption - short lifespan" faced by Bluetooth door control devices. It is particularly suitable for scenarios requiring long battery life and low maintenance, such as basements and villas, providing a benchmark solution for power consumption optimization in the field of smart access control.

[0045] In basement or villa access control scenarios, users need to monitor the system status in real time (e.g., whether the Bluetooth connection is successful, whether the door is opening / closing, fault alarms, etc.). Traditional solutions lack intuitive feedback, leading to the following problems: First, the operation is opaque; users cannot confirm whether Bluetooth is connected, potentially misjudging door malfunctions (e.g., repeated triggering). Second, there are safety hazards; there is no warning when the door closes unexpectedly or becomes stuck, easily causing pinching injuries or equipment damage. Third, maintenance is difficult; troubleshooting relies on specialized tools, making it impossible to quickly locate problems through simple indicators. Therefore, the access control module includes a status indicator unit, a status indicator sheet... The system uses LED lights or a buzzer to indicate the current Bluetooth connection status and door movement progress; specifically: LED lights display in stages: solid blue: Bluetooth is connected and the door remains open; flashing green (1Hz): the door is opening / closing; fast red (5Hz): Bluetooth connection interrupted or door movement malfunction; slow yellow (0.5Hz): low battery or system self-test in progress; the buzzer provides tiered alarms: a single short beep (0.1 seconds): door movement complete; three long beeps (0.5 seconds each): obstacle detected or motor overload; continuous buzzing: emergency fault (such as relay sticking). (Connected); Simultaneously, an energy-saving mode is set, where the LED brightness automatically drops to 10% and the buzzer silences after the door has been stationary for more than 30 seconds; considering that metal basement doors or complex electromagnetic environments may interfere with LED / buzzer signal transmission, causing the indication to be out of sync with the actual state; therefore, hardware-level state synchronization circuit technology and ambient light adaptive adjustment technology are adopted. The hardware-level state synchronization circuit technology directly connects the LED / buzzer drive signals to the GPIO pins of the door control module, bypassing the main control MCU, ensuring that even if the MCU crashes, the indication remains consistent with the physical state of the door, using differential signal transmission. This invention suppresses common-mode interference (such as voltage fluctuations caused by motor start-stop in basements); ambient light adaptive adjustment technology uses a photosensitive sensor to detect ambient brightness and dynamically adjusts LED brightness (e.g., increasing to 100% brightness in a dark basement environment), and the buzzer volume dynamically adjusts according to ambient noise levels (e.g., reducing to 50dB in a quiet villa environment), thereby improving anti-interference capabilities and enhancing environmental adaptability; through a combination of multimodal hierarchical indication, hardware synchronization, and intelligent energy saving, this invention significantly improves security, operational efficiency, and device battery life while ensuring users can intuitively perceive the system status. It is particularly suitable for complex lighting conditions in basements and low-noise environments in villas, solving the pain point of "black box operation" in traditional access control systems and providing a benchmark solution for intelligent access control that integrates "user-friendly, high security, and long battery life" in terms of status feedback.

[0046] When replacing an electric gate with the same model, users need to retain the original remote control code, gate travel time, limit parameters, and other configurations to avoid repeated settings and reduce installation time and learning costs. Therefore, radio frequency signal copying technology is used to migrate the parameters of the original electric gate to the new electric gate's control module. This eliminates the need for users to reset parameters when replacing the same model of gate, shortening deployment time. Furthermore, newly manufactured electric gates need to be compatible with multiple brands of door operators (such as Hoss, Ruis, and Aorun). Different brands of door operators have different control protocols (such as Modbus and CAN bus) and hardware interfaces (such as RS-485 and dry contacts). Customizing a control system for each brand would significantly increase R&D costs and production cycle. Therefore, the door control module includes preset ports that support adaptation and connection for Hoss, Ruis, Aorun, and other brand door operators, saving on custom development costs. Through copying and cloning, and dual-mode adaptation with reserved ports, seamless migration and full-scene compatibility of the old and new door control systems are achieved.

[0047] In summary, the control steps for the electric gates in basements or villas in this solution are as follows:

[0048] S1. The Bluetooth module continuously scans for Bluetooth signals from vehicles or mobile terminals within a preset range.

[0049] S2. When an authorized device is detected to enter the connection range, a Bluetooth connection is established and the relay control module is triggered to continuously output an opening signal.

[0050] S3. The door control module drives the electric door to open according to the door opening signal and keeps it open during the Bluetooth connection.

[0051] S4. When the authorized device goes out of Bluetooth connection range and causes signal interruption, the relay control module immediately cuts off the door opening signal and sends a door closing command.

[0052] S5. The door control module responds to the door closing command and controls the electric door to close.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power door automatic control system based on Bluetooth connection state trigger, characterized in that, Be applied to the electric door control scene, comprising: The Bluetooth module is used for establishing Bluetooth connection with the vehicle or the mobile terminal, and monitoring the connection state in real time. The Bluetooth module includes a priority connection logic unit. When multiple authorized Bluetooth devices are detected at the same time, the priority connection logic unit responds to the preset master device signal and switches to the standby device to maintain the connection after the master device is disconnected. The relay control module is in signal connection with the Bluetooth module, and continuously sends the door opening control signal to the door control module during the Bluetooth connection. The relay control module includes a delay subunit for delaying a preset time before triggering the door closing control signal after the Bluetooth connection is interrupted. The relay control module uses a normally closed relay, which remains energized and attracted during Bluetooth connection to maintain the door opening signal, and automatically resets to the de-energized state to trigger the door closing after Bluetooth is disconnected. The door control module receives the driving signal of the relay control module and controls the electric door motor to perform the door opening or closing action. When the Bluetooth connection is interrupted, the relay control module immediately cuts off the output of the door opening control signal and triggers the door closing control signal. A dynamic power consumption adjustment protocol is used between the Bluetooth module and the relay control module to reduce the signal transmission frequency to a preset Hz after the Bluetooth connection is stable to save energy consumption. A double-threshold fault tolerance mechanism is added in the dynamic power consumption adjustment protocol. Specifically, if there are 3 consecutive periods of packet loss, the frequency is automatically increased to the previous level, and when RSSI is less than -80dBm, the frequency rollback is triggered and the signal enhancement mode is started. The door control module includes a state indication unit that prompts the current Bluetooth connection state and the door body action process through LED light or buzzer.

2. The electric door automatic control system based on the Bluetooth connection state trigger according to claim 1, characterized in that: The Bluetooth module is a low-power Bluetooth module. When any condition of the signal strength threshold and the preset distance threshold is met, it is determined that the Bluetooth connection is valid.

3. The electric door automatic control system based on Bluetooth connection state trigger according to claim 1, characterized in that: The Bluetooth module integrates an identity verification unit. Only when an authorized vehicle Bluetooth MAC address or mobile terminal device unique identifier is identified, the connection is established.

4. The electric door automatic control system based on Bluetooth connection state trigger according to claim 1, characterized in that: The Bluetooth module includes an interference subunit that scans the 2.4GHz frequency band through dynamic frequency selection technology, automatically switches to the idle channel, and avoids channel conflict with Wi-Fi or microwave devices.

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