Bluetooth-based unlocking and locking system
By combining built-in and external antennas and a signal processing module, the problem of insensitive operation and misoperation caused by weak Bluetooth signals has been solved, resulting in a more stable and secure car unlocking and locking system.
Patent Information
- Application Number
- CN202520150412.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Existing Bluetooth-based car unlocking and locking systems are easily interfered with when the signal strength is weak, resulting in insensitive operation or misoperation, and insufficient functional integrity and stability.
It adopts a design that combines built-in and external antennas, along with signal processing and control modules. Through adaptive filtering algorithms and multi-identity authentication mechanisms, it improves signal stability and coverage, and enhances signal reception capabilities by automatically switching antennas.
It improves the stability and coverage of Bluetooth signals, ensures operational sensitivity and safety, reduces misoperation, and enhances the functional integrity of the system and the overall safety of the vehicle.
Smart Images
Figure CN223926941U_ABST
Abstract
Description
Technical Field
[0001] This application relates to an unlocking and locking system, and more particularly to a Bluetooth-based unlocking and locking system, belonging to the field of vehicle auxiliary technology. Background Technology
[0002] In modern society, cars have become an indispensable means of transportation. With the widespread use of smartphones and other mobile devices, Bluetooth technology is increasingly being applied in the automotive field. Traditional car remote keys require users to manually press a button to unlock or lock the doors, which is relatively cumbersome. Bluetooth contactless locking technology, however, allows users to operate the doors without manual intervention, making it much more convenient and faster.
[0003] Currently, some high-end car brands have begun to adopt similar technologies, but these systems still have some issues regarding functional integrity, stability, and security. Some systems have weak Bluetooth signal strength, making them susceptible to interference, which can lead to unresponsive locks or malfunctions. Utility Model Content
[0004] In view of this, this application provides a Bluetooth-based unlocking and closing system to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.
[0005] The technical solution of this application embodiment is implemented as follows:
[0006] This application provides a Bluetooth-based unlocking and locking system, which includes at least a Bluetooth module, a signal processing module, and a control module.
[0007] The Bluetooth module is used to communicate with a smart terminal to receive and send Bluetooth signals; wherein the Bluetooth module includes at least a built-in antenna and an external antenna.
[0008] The signal processing module is used to extract the unlocking control signal or the locking control signal based on the Bluetooth signal.
[0009] The control module is used to control the door lock actuator to perform the corresponding unlocking or locking operation according to the unlocking control signal or the locking control signal.
[0010] A further preferred embodiment: the built-in antenna is disposed at a first preset position inside the target vehicle, and the external antenna is disposed at a second preset position outside the target vehicle.
[0011] Further preferred: the built-in antenna and the external antenna have the same circuit composition, including at least an ANT interface, capacitors C8, C9, C36, and C37, inductors L2 and L3, resistors R38 and R39, light-emitting diode LED10, and chip BT1.
[0012] A further preferred embodiment: the ANT interface is connected to capacitor C37, the other end of capacitor C37 is connected to capacitor C9, inductor L2 and inductor L3 respectively, and capacitor C9, inductor L2 and inductor L3 connected in series with capacitor C8 are connected in parallel; any point where capacitor C8 and inductor L3 are connected in series is connected to port ANT of chip BT1; the negative terminal of light-emitting diode LED10 is connected in series with resistor R39 to port PA5 of chip BT1, and the positive terminal of light-emitting diode LED10 is connected to an external power supply; resistor R38 and capacitor C36 are connected in parallel and then connected to port RESET and port GND of chip BT1 respectively; port GND of chip BT1 is grounded; port VBAT of chip BT1 is connected to the external power supply.
[0013] Further preferably, the Bluetooth module is also used to obtain a corresponding signal state based on the Bluetooth signal, so as to obtain the Bluetooth signal received by the external antenna based on the signal state.
[0014] Further preferably, the UART0_RXD and ART0_TXD ports of the chip BT1 are connected to the signal processing module.
[0015] Further preferred: The control module includes at least relay DJ9, relay DJ10, diode D3, diode D4, diode D5, diode D6, transistor Q1, transistor Q2, resistor R3, resistor R40, resistor R41 and resistor R42.
[0016] Further preferably: the positive terminal of diode D5 is connected to relay DJ9 and pin LOCK_PIN respectively; wherein, pin LOCK_PIN is used to issue a lockout control signal; the positive terminal of diode D6 is connected to relay DJ10 and pin UNLOCK_PIN respectively; wherein, pin UNLOCK_PIN is used to issue an unlocking control signal; the negative terminals of diodes D5 and D6, as well as relays DJ9 and DJ10, are also grounded.
[0017] A further preferred embodiment: One end of resistor R40 is connected to the signal processing module to receive the lockout control signal. The other end of resistor R40 is connected to resistor R3 and the base of transistor Q1, and the other end of resistor R3 is grounded to the emitter of transistor Q1. Simultaneously, the collector of transistor Q1 is connected to the anode of diode D5 and then connected to relay DJ9. One end of resistor R41 is connected to the signal processing module to receive the unlocking control signal. The other end of resistor R41 is connected to resistor R42 and the base of transistor Q2, and the other end of resistor R42 is grounded to the emitter of transistor Q2. Simultaneously, the collector of transistor Q2 is connected to the anode of diode D4 and then connected to relay DJ10.
[0018] Further preferred: the relays DJ9 and DJ10 are also connected to the external power supply.
[0019] The embodiments of this application have the following advantages due to the adoption of the above technical solutions:
[0020] This application improves the stability and coverage of Bluetooth signals through a combination of built-in and external Bluetooth antenna design.
[0021] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a framework diagram of the Bluetooth-based unlocking and locking system described in this application.
[0024] Figure 2 This is a schematic diagram of the Bluetooth module described in this application.
[0025] Figure 3 This is a schematic diagram of the signal processing module described in this application.
[0026] Figure 4 This is a schematic diagram of the control module described in this application. Detailed Implementation
[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0028] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0029] like Figure 1 As shown in the figure, this application provides a Bluetooth-based unlocking and locking system, which includes at least a Bluetooth module, a signal processing module, and a control module.
[0030] The Bluetooth module is used to communicate with a smart terminal to receive and send Bluetooth signals; wherein the Bluetooth module includes at least a built-in antenna and an external antenna.
[0031] The signal processing module is used to extract the unlocking control signal or the locking control signal based on the Bluetooth signal.
[0032] The control module is used to control the door lock actuator to perform the corresponding unlocking or locking operation according to the unlocking control signal or the locking control signal.
[0033] In this embodiment, specifically: the built-in antenna is disposed at a first preset position inside the target vehicle, and the external antenna is disposed at a second preset position outside the target vehicle.
[0034] In this embodiment, specifically: the built-in antenna and the external antenna have the same circuit composition, including at least an ANT interface, capacitors C8, C9, C36, and C37, inductors L2 and L3, resistors R38 and R39, light-emitting diode LED10, and chip BT1.
[0035] In this embodiment, specifically: the ANT interface is connected to capacitor C37, and the other end of capacitor C37 is connected to capacitor C9, inductor L2, and inductor L3 respectively. Capacitor C9, inductor L2, and inductor L3 (connected in series with capacitor C8) are connected in parallel. Any point where capacitor C8 and inductor L3 are connected in series is connected to port ANT of chip BT1. The negative terminal of LED10 is connected in series with resistor R39 to port PA5 of chip BT1, and the positive terminal of LED10 is connected to an external power supply. Resistor R38 and capacitor C36 are connected in parallel to ports RESET and GND of chip BT1 respectively. Port GND of chip BT1 is grounded. Port VBAT of chip BT1 is connected to the external power supply.
[0036] In this embodiment, specifically: the Bluetooth module is further configured to obtain the corresponding signal state based on the Bluetooth signal, so as to obtain the Bluetooth signal received by the external antenna based on the signal state.
[0037] In this embodiment, specifically: the UART0_RXD and ART0_TXD ports of the chip BT1 are connected to the signal processing module.
[0038] In this embodiment, specifically: the control module includes at least relay DJ9, relay DJ10, diode D3, diode D4, diode D5, diode D6, transistor Q1, transistor Q2, resistor R3, resistor R40, resistor R41, and resistor R42.
[0039] In this embodiment, specifically: the positive terminal of diode D5 is connected to relay DJ9 and pin LOCK_PIN; wherein, pin LOCK_PIN is used to issue a lockout control signal; the positive terminal of diode D6 is connected to relay DJ10 and pin UNLOCK_PIN; wherein, pin UNLOCK_PIN is used to issue an unlocking control signal; the negative terminals of diodes D5 and D6, as well as relays DJ9 and DJ10, are also grounded.
[0040] In this embodiment, specifically: one end of resistor R40 is connected to the signal processing module to receive the lockout control signal; the other end of resistor R40 is connected to resistor R3 and the base of transistor Q1, and the other end of resistor R3 is grounded to the emitter of transistor Q1. Simultaneously, the collector of transistor Q1 is connected to the anode of diode D5 and then connected to relay DJ9. One end of resistor R41 is connected to the signal processing module to receive the unlocking control signal; the other end of resistor R41 is connected to resistor R42 and the base of transistor Q2, and the other end of resistor R42 is grounded to the emitter of transistor Q2. Simultaneously, the collector of transistor Q2 is connected to the anode of diode D4 and then connected to relay DJ10.
[0041] In this embodiment, specifically: relays DJ9 and DJ10 are also connected to the external power supply.
[0042] When in operation, this application enables the automatic opening and closing of vehicle locks by detecting the proximity and distance of smart terminals (such as mobile phones).
[0043] Furthermore, the Bluetooth module employs a high-performance Bluetooth chip, boasting strong signal reception and transmission capabilities. The Bluetooth module's antenna design combines internal and external antennas to enhance signal coverage and stability. The internal antenna is installed inside the vehicle, while the external antenna is mounted on the exterior. Automatic switching between the internal and external antennas is achieved through a signal processing module. For example, when the car is parked in an indoor parking lot or other environment with weak signal, the system automatically switches to the external antenna to improve signal reception.
[0044] It should be noted that those skilled in the art can set the specific installation location of the antenna according to the actual application requirements. For example, the built-in antenna can be installed near the door control module, inside the center console, or under the seat to ensure signal coverage of the door control area. The external antenna can be installed on the roof, rear windshield, or front bumper to enhance signal reception, especially in environments with weak signals.
[0045] The Bluetooth module also features automatic pairing and connection capabilities. When a user approaches the car with their smartphone, the Bluetooth module can quickly identify and pair with the user's phone. Furthermore, the Bluetooth module can store information about multiple paired devices, allowing users to easily switch between different devices.
[0046] Furthermore, the BT1 chip mainly consists of a second-order LC-π filter. The LC filter circuit utilizes the characteristics of inductors L3 / L2 (high AC impedance, low DC impedance) and capacitors C8 / C37 / C9 (open circuit for DC, low AC impedance) to achieve filtering. In the LC filter circuit, when the frequency of the input signal changes, the impedance of the inductor and capacitor also changes accordingly, thus presenting different impedances for signals of different frequencies. The amplifier, located inside the BT1 chip, amplifies the Bluetooth signal and enhances its strength.
[0047] Furthermore, the chip BT1 analyzes and processes the filtered and amplified signal to extract information such as signal strength and device identification, and transmits this information to the signal control module.
[0048] The BT1 chip employs advanced digital signal processing technology and algorithms. For example, it uses an adaptive filtering algorithm to automatically adjust filter parameters based on changes in the surrounding environment to adapt to different signal interference conditions. Simultaneously, it uses a signal strength weighted averaging algorithm to perform weighted averaging of multiple Bluetooth signal strength values, improving the accuracy of signal strength assessment.
[0049] In addition to adaptive filtering and signal strength weighted averaging algorithms, other signal processing algorithms, such as machine learning and neural network algorithms, can also be considered. These algorithms can learn and train on large amounts of Bluetooth signal data to automatically adjust system parameters, thereby improving the accuracy and stability of signal processing.
[0050] Furthermore, the signal processing module adopts a high-performance microcontroller with powerful data processing capabilities and abundant interface resources. Based on the information provided by the Bluetooth module, it determines whether the user is approaching or moving away from the car, and issues an unlocking control signal or a locking control signal based on the determination result.
[0051] The signal processing module employs a multi-factor authentication mechanism. When a smartphone approaches the car, the control unit not only detects the Bluetooth signal strength but also verifies the device identifier, password, and other information to ensure that only authorized users can unlock the vehicle. Simultaneously, the signal processing module can also integrate with other vehicle security systems, such as anti-theft alarm systems and engine immobilizers, to enhance overall vehicle security.
[0052] Furthermore, the signal processing module communicates with the Bluetooth module via "TX" / "RX" to determine the current distance. When the identity information and distance are close enough, the main control "UNLOCK_C" pin goes high, causing the control module's transistor Q2 to conduct, relay DJ10 to close, VIN to "UNLOCK_C", and current flows from "UNLOCK_C" through the motor to "LOCK_C" and finally back to GND, completing the motor unlocking process.
[0053] Similarly, when the distance is determined to be far away, the main control "LOCK_C" pin goes high, causing the transistor Q1 of the control module to conduct, the relay DJ9 to close, VIN to "LOCK_C", and the current flows from "LOCK_C" through the motor to "UNLOCK_C" and finally back to GND, and the motor completes the lockout.
[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A Bluetooth based lock system, characterized in that, At least comprising a Bluetooth module, a signal processing module and a control module; The Bluetooth module is used for communicating with a smart terminal to receive and send Bluetooth signals; wherein the Bluetooth module at least comprises a built-in antenna and an external antenna; The signal processing module is used for extracting an unlocking control signal or a locking control signal based on the Bluetooth signals; The control module is used for controlling a vehicle door lock actuator to perform a corresponding unlocking operation or locking operation according to the unlocking control signal or the locking control signal.
2. The Bluetooth based lock / unlock system according to claim 1, wherein, The built-in antenna is arranged at a first preset position inside a target vehicle, and the external antenna is arranged at a second preset position outside the target vehicle.
3. The Bluetooth based lock / unlock system according to claim 2, wherein, The built-in antenna and the external antenna have the same circuit composition, at least comprising an ANT interface, a capacitor C8, a capacitor C9, a capacitor C36, a capacitor C37, an inductor L2, an inductor L3, a resistor R38, a resistor R39, a light-emitting diode LED10 and a chip BT1.
4. The Bluetooth based lock / unlock system according to claim 3, wherein, The ANT interface accesses the capacitor C37, the other end of the capacitor C37 accesses the capacitor C9, the inductor L2 and the inductor L3 respectively, and the capacitor C9 and the inductor L2 are connected in parallel with the inductor L3 connected with the capacitor C8 in series; Any point of the capacitor C8 and the inductor L3 in series connection accesses the port ANT of the chip BT1; The negative electrode of the light-emitting diode LED10 is connected in series with the resistor R39 to access the port PA5 of the chip BT1, and the positive electrode of the light-emitting diode LED10 is connected with an external power supply; The resistor R38 and the capacitor C36 are connected in parallel and then access the port RESET and the port GND of the chip BT1 respectively; The port GND of the chip BT1 is grounded; The port VBAT of the chip BT1 accesses the external power supply.
5. The Bluetooth based lock / unlock system according to claim 1, wherein, The Bluetooth module is also used for obtaining a corresponding signal state based on the Bluetooth signals, to obtain the Bluetooth signals received by the external antenna based on the signal state.
6. The Bluetooth based lock / unlock system according to claim 3, wherein, The port UART0_RXD and the port ART0_TXD of the chip BT1 are connected with the signal processing module.
7. The Bluetooth based lock / unlock system of claim 1, wherein, The control module at least comprises a relay DJ9, a relay DJ10, a diode D3, a diode D4, a diode D5, a diode D6, a triode Q1, a triode Q2, a resistor R3, a resistor R40, a resistor R41 and a resistor R42.
8. The Bluetooth based lock / unlock system of claim 7, wherein, The positive electrode of the diode D5 accesses the relay DJ9 and a pin LOCK_PIN respectively; wherein the pin LOCK_PIN is used for issuing a locking control signal; The positive electrode of the diode D6 accesses the relay DJ10 and a pin UNLOCK_PIN respectively; wherein the pin UNLOCK_PIN is used for issuing an unlocking control signal; The negative electrodes of the diode D5 and the diode D6, and the relays DJ9 and DJ10 are also grounded.
9. The Bluetooth based lock system according to claim 8, wherein, One end of the resistor R40 is connected with the signal processing module, for receiving the locking control signal, the other end of the resistor R40 is connected with the resistor R3 and the base of the transistor Q1, and the other end of the resistor R3 is connected with the emitter of the transistor Q1 and grounded, and the collector of the transistor Q1 is connected with the positive electrode of the diode D5 and the relay DJ9; One end of the resistor R41 is connected with the signal processing module, for receiving the unlocking control signal, the other end of the resistor R41 is connected with the resistor R42 and the base of the transistor Q2, and the other end of the resistor R42 is connected with the emitter of the transistor Q2 and grounded, and the collector of the transistor Q2 is connected with the positive electrode of the diode D4 and the relay DJ10.
10. The Bluetooth based lock / unlock system of claim 7, wherein, The relay DJ9 and the relay DJ10 are also connected with the external power supply.