Vehicle intelligent key system based on multi-mode communication and vehicle searching method

Abstract

The invention provides a vehicle intelligent key system based on multi-mode communication and a vehicle searching method, and belongs to the technical field of vehicle searching. When the relative position of the vehicle intelligent key and the vehicle is a long distance, the control module obtains the positioning of the current vehicle intelligent key through the wireless cellular network module, calculates the distance and direction of the vehicle in combination with the positioning of the vehicle, displays the distance and direction in the display module, and updates data in real time according to the movement of a user; when the relative position of the vehicle intelligent key and the vehicle is at a medium distance, the control module receives a signal of the Bluetooth antenna through the Bluetooth module, calculates the relative position of the vehicle intelligent key and the vehicle, displays the relative position through the display module, and updates data in real time according to the movement of a user; and when the relative position of the vehicle intelligent key and the vehicle is close, the vehicle intelligent key communicates with the ultra wide band anchor point through the ultra wide band module to position the vehicle. When a user forgets the position of the vehicle, the user can find the vehicle according to the instruction of the vehicle key.

Description

Technical Field

[0001] This invention belongs to the field of vehicle locator technology. Specifically, this invention relates to a vehicle smart key system and vehicle locator method based on multi-mode communication. Background Technology

[0002] With the rapid development of automotive electronics and intelligence, in-vehicle smart keys have become one of the core configurations of automobiles. Their functions have gradually expanded from traditional door unlocking and vehicle starting to include diverse scenarios such as vehicle location and remote control. Currently, when users search for their vehicles in complex environments such as large parking lots and densely populated high-rise buildings, they often face problems such as low vehicle positioning accuracy, limited search distance, and poor communication stability. Traditional in-vehicle vehicle location technology can no longer meet users' needs for an efficient and accurate vehicle location experience.

[0003] Chinese Patent 116013104B discloses a parking lot car finding method, device, and system. The method includes: acquiring a user's car finding request; determining the user's current location and parking location based on the user's car finding request; determining a corresponding parking lot car finding strategy based on the current location and parking location, the parking lot car finding strategy including a cross-floor car finding strategy and a same-floor car finding strategy, the cross-floor car finding strategy being implemented based on the passage node information of each floor; and determining the user's final car finding path based on the parking lot car finding strategy and the parking lot map data, so that the user can reach the parking location according to the final car finding path.

[0004] Existing vehicle locating methods are quite complex and do not provide a method for locating a vehicle based on its key. Summary of the Invention

[0005] The present invention aims to provide a vehicle smart key system and vehicle locator method based on multi-mode communication, enabling the locator to find the vehicle based on the instructions of the vehicle key when the user forgets the vehicle's location.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a vehicle smart key system based on multi-mode communication, including a control module, a wireless cellular network module, a Bluetooth module, an ultra-wideband module, a wireless transceiver module, and a display module. The control module is electrically connected to the wireless cellular network module, Bluetooth module, ultra-wideband module, wireless transceiver module, and display module. The vehicle using the vehicle smart key system includes an on-board base station, a Bluetooth antenna, and an ultra-wideband anchor point. The signal receiver is used to receive signals emitted by the wireless transceiver module, the Bluetooth antenna is used to emit Bluetooth signals, and the ultra-wideband anchor point is used to receive ultra-wideband signals.

[0008] There are four Bluetooth antennas, which are installed around the vehicle.

[0009] Ultra-wideband anchor points use UWB signal response equipment.

[0010] This invention provides a vehicle locator method based on multi-mode communication, comprising the following steps: based on the distance between the vehicle smart key and the vehicle, the control module collects information through a wireless cellular network module, a Bluetooth module, and an ultra-wideband module respectively, and calculates the relative position between the vehicle smart key and the vehicle.

[0011] When the relative position of the vehicle smart key and the vehicle is far apart, the control module obtains the current location of the vehicle smart key through the wireless cellular network module, calculates the distance and direction of the vehicle in combination with the vehicle's location, and displays it in the display module, and updates the data in real time according to the user's movement.

[0012] When the relative position of the vehicle smart key and the vehicle is at a medium distance, the control module receives the signal from the Bluetooth antenna through the Bluetooth module, calculates the relative position of the vehicle smart key and the vehicle, displays it through the display module, and updates the data in real time according to the user's movement.

[0013] When the vehicle smart key is close to the vehicle, it uses an ultra-wideband module to communicate with an ultra-wideband anchor point to locate the vehicle.

[0014] The control module determines the distance between the vehicle's smart key and the vehicle in real time, and switches to position detection mode when the distance reaches the determination threshold.

[0015] The wireless cellular network positioning method is as follows: The control module collects the positioning data of the vehicle smart key through the wireless cellular network module, including satellite positioning data and base station positioning data, and calculates the final positioning data of the vehicle smart key through a weighted average algorithm, and calculates the relative position of the vehicle smart key and the vehicle by combining the vehicle's positioning data.

[0016] The vehicle's position is calculated as follows: the signal strength value of the Bluetooth antenna is converted into a distance value, and the relative coordinates of the vehicle's smart key are calculated using the fixed coordinates of the four antennas to determine the vehicle's direction relative to the smart key.

[0017] The vehicle's location is calculated by taking the flight time of the ultra-wideband signal from the smart key to the anchor point, and combining this with the propagation speed of the ultra-wideband signal to calculate the distance.

[0018] When the distance between the vehicle's smart key and the vehicle reaches a set value, the vehicle triggers the welcome function, and the doors automatically unlock.

[0019] The technical effects of this invention are as follows:

[0020] (1) By combining three modes, namely wireless cellular network, BLE and UWB, this invention can achieve a car-finding function without line of sight or obstacles. No matter when or where, it can locate the car and guide the car owner to find the car's location, thus solving the problem of difficulty in finding the car with existing car keys.

[0021] (2) By applying multiple communication modes, this invention improves the reliability and stability of communication between the smart key and the vehicle, and can ensure good performance under different environmental and distance conditions.

[0022] (3) This invention integrates multiple functions, such as automatically unlocking the vehicle and turning on the interior lights when the user approaches the vehicle, providing the user with a more convenient and comfortable user experience and improving the intelligence level of the car. Attached Figure Description

[0023] This manual includes the following figures, which illustrate the following:

[0024] Figure 1 This is a logical structure block diagram of a vehicle smart key system and vehicle finding method based on multi-mode communication according to the present invention. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0026] This invention provides a vehicle smart key system based on multi-mode communication, including a control module, a wireless cellular network module, a Bluetooth module, an ultra-wideband module, a wireless transceiver module, and a display module. The control module is electrically connected to the wireless cellular network module, Bluetooth module, ultra-wideband module, wireless transceiver module, and display module. The vehicle using the vehicle smart key system includes an on-board base station, a Bluetooth antenna, and an ultra-wideband anchor point. The signal receiver is used to receive signals emitted by the wireless transceiver module, the Bluetooth antenna is used to emit Bluetooth signals, and the ultra-wideband anchor point is used to receive ultra-wideband signals.

[0027] There are four Bluetooth antennas, which are installed around the vehicle.

[0028] Ultra-wideband anchor points use UWB signal response equipment.

[0029] This invention provides a vehicle locator method based on multi-mode communication, comprising the following steps: based on the distance between the vehicle smart key and the vehicle, the control module collects information through a wireless cellular network module, a Bluetooth module, and an ultra-wideband module respectively, and calculates the relative position between the vehicle smart key and the vehicle.

[0030] When the relative position of the vehicle smart key and the vehicle is far apart, the control module obtains the current location of the vehicle smart key through the wireless cellular network module, calculates the distance and direction of the vehicle in combination with the vehicle's location, and displays it in the display module, and updates the data in real time according to the user's movement.

[0031] When the relative position of the vehicle smart key and the vehicle is at a medium distance, the control module receives the signal from the Bluetooth antenna through the Bluetooth module, calculates the relative position of the vehicle smart key and the vehicle, displays it through the display module, and updates the data in real time according to the user's movement.

[0032] When the vehicle smart key is close to the vehicle, it uses an ultra-wideband module to communicate with an ultra-wideband anchor point to locate the vehicle.

[0033] The control module determines the distance between the vehicle's smart key and the vehicle in real time, and switches to position detection mode when the distance reaches the determination threshold.

[0034] The wireless cellular network positioning method is as follows: The control module collects the positioning data of the vehicle smart key through the wireless cellular network module, including satellite positioning data and base station positioning data, and calculates the final positioning data of the vehicle smart key through a weighted average algorithm, and calculates the relative position of the vehicle smart key and the vehicle by combining the vehicle's positioning data.

[0035] The vehicle's position is calculated as follows: the signal strength value of the Bluetooth antenna is converted into a distance value, and the relative coordinates of the vehicle's smart key are calculated using the fixed coordinates of the four antennas to determine the vehicle's direction relative to the smart key.

[0036] The vehicle's location is calculated by taking the flight time of the ultra-wideband signal from the smart key to the anchor point, and combining this with the propagation speed of the ultra-wideband signal to calculate the distance.

[0037] When the distance between the vehicle's smart key and the vehicle reaches a set value, the vehicle triggers the welcome function, and the doors automatically unlock.

[0038] The present invention will now be described in detail.

[0039] The vehicle smart key system based on multi-mode communication disclosed in this invention adopts a highly integrated hardware architecture, integrating the control module, wireless cellular network module, Bluetooth module, ultra-wideband module, wireless transceiver module, battery module, display module and all of them into a single vehicle smart key.

[0040] The control module uses the STM32H743VIT6 microcontroller, which has multi-core processing capabilities, high-speed computing performance, and rich peripheral interfaces. It can simultaneously control multiple communication modules, support real-time signal processing and algorithm operation, and meet the needs of multi-mode collaborative work. The chip has a built-in hardware encryption module to ensure the security of communication between the key and the vehicle.

[0041] The wireless cellular network module uses the Quectel EC200S 4G module, which supports full network compatibility and can access the networks of China Mobile, China Unicom, and China Telecom operators. The module has a built-in GPS / BeiDou positioning unit, which can accurately record the latitude and longitude information of the vehicle when it is parked. Through base station-assisted positioning technology, it can still obtain the user's current location information in indoor or obstructed environments, and realize the determination of the vehicle's location range over long distances.

[0042] The Bluetooth module used is the Nordic nRF52840 model, which supports the BLE 5.2 protocol, has a communication distance of up to 250m, and features strong anti-interference capabilities. The Bluetooth module and the control module are connected via an SPI interface, which can transmit BLE antenna signal values ​​in real time.

[0043] The ultra-wideband module uses the Decawave DW1000 model ultra-wideband module, which supports the TOF (Time of Flight) ranging algorithm and has a communication distance of up to 20m.

[0044] The wireless transceiver module uses the TI CC1101 RF module, which operates at a frequency of 433MHz, supports bidirectional data transmission, and has a transmission rate of up to 500kbps. It is mainly used for command interaction between the smart key and the vehicle base station to ensure reliable transmission of control commands such as unlocking and starting.

[0045] The display module uses a 0.96-inch OLED display screen, which can clearly display vehicle distance, battery level, vehicle direction, and vehicle status (lock / unlock) information.

[0046] The electrical connections between modules are made by welding shielded wires, and the power supply layer and grounding layer are set up separately to reduce signal interference.

[0047] One Bluetooth antenna is installed in each of the four locations on the vehicle: the front bumper, the rear bumper, the left rearview mirror, and the right rearview mirror, forming all-around signal coverage. The antennas adopt an external design to ensure signal transmission quality within a range of 250m. Each antenna is connected to the vehicle's Bluetooth controller via a shielded cable, and the controller is installed inside the vehicle's center console.

[0048] Ultra-wideband (UWB) anchors are installed on the driver's side door, passenger side door, center console, and trunk of the vehicle, providing full indoor and outdoor coverage. The UWB anchors utilize the Decawave DW1000 UWB transceiver chip to generate and transmit UWB pulse signals in the 3.5-6.5 GHz frequency band.

[0049] An onboard base station is installed inside the vehicle's center console to receive commands sent by the smart key and control the vehicle to perform corresponding functions, such as unlocking, starting, and turning on the lights.

[0050] After the user exits the vehicle, the smart key uses the GPS / BeiDou positioning system via the wireless cellular network module to locate the vehicle's position after the user locks the car, and stores this information in the control module. Once the user leaves the vehicle, the smart key activates, locating and displaying the vehicle's position based on the distance to the car.

[0051] When the distance between the vehicle smart key and the vehicle is long (in this embodiment, long distance is defined as greater than 250m), the wireless cellular network module simultaneously obtains the user's current location via GPS / BeiDou positioning and combines it with base station positioning data. A weighted average algorithm is then used to calculate the distance range between the user and the vehicle, where GPS / BeiDou positioning data and base station positioning data each account for half the weight in the weighted average algorithm. The control module displays "Distance XX meters, Direction XX" on the screen and adjusts the navigation arrow direction in real time via a gyroscope as the user moves, updating the location information synchronously with the distance and orientation changes.

[0052] When the distance between the vehicle smart key and the vehicle is at a moderate distance (in this embodiment of the invention, moderate distance is less than or equal to 250m and greater than 20m), the vehicle smart key collects signals emitted by the vehicle's four BLE antennas via a Bluetooth module. Based on the RSSI signal strength of the four Bluetooth antennas, equal weights are assigned, and a weighted average algorithm is used to calculate the owner's relative coordinates. The vehicle smart key displays navigation arrows and the vehicle's distance and direction information on a screen. A gyroscope, combined with the user's movement posture, adjusts the navigation guidance in real time to guide the user closer to the vehicle.

[0053] When the distance between the vehicle smart key and the vehicle is close (in this embodiment, close distance is less than or equal to 20m), the control module sends a ranging signal through the ultra-wideband module. Using a Time-of-Flight (TOF) ranging algorithm, the distance is calculated by measuring the time of flight of the ultra-wideband signal between the key and the vehicle's UWB anchor point, and then displayed on the screen. In this embodiment, when the vehicle smart key is 6m away from the vehicle, it triggers the automatic activation of the interior lighting; when the vehicle smart key is less than 3m away, it triggers the automatic unlocking of the vehicle doors and the automatic unfolding of the rearview mirrors.

[0054] This invention combines three modes—wireless cellular network, BLE, and UWB—to achieve a line-of-sight and obstacle-free vehicle location function. It can locate the vehicle's position anytime and anywhere and guide the owner to find the vehicle, solving the problem of difficulty in finding the car using existing car keys.

[0055] This invention improves the reliability and stability of communication between the smart key and the vehicle by applying multiple communication modes, ensuring good performance under different environmental and distance conditions.

[0056] This invention integrates multiple functions, such as automatically unlocking the vehicle and turning on the interior lights when the user approaches, providing a more convenient and comfortable user experience and improving the intelligence level of the car.

[0057] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A vehicle smart key system based on multi-mode communication, characterized in that, The system includes a control module, a wireless cellular network module, a Bluetooth module, an ultra-wideband module, a wireless transceiver module, and a display module. The control module is electrically connected to the wireless cellular network module, Bluetooth module, ultra-wideband module, wireless transceiver module, and display module, respectively. Vehicles using the smart key system include an on-board base station, a Bluetooth antenna, and an ultra-wideband anchor point. The signal receiver is used to receive signals emitted by the wireless transceiver module, the Bluetooth antenna is used to emit Bluetooth signals, and the ultra-wideband anchor point is used to receive ultra-wideband signals.

2. The vehicle smart key system as described in claim 1, characterized in that: There are four Bluetooth antennas, which are installed around the vehicle.

3. The vehicle smart key system as described in claim 1, characterized in that: Ultra-wideband anchor points use UWB signal transmitting equipment.

4. A vehicle-finding method based on multi-mode communication, characterized in that, The vehicle smart key system according to any one of claims 1-3 includes the following steps: based on the distance between the vehicle smart key and the vehicle, the control module collects information and calculates the relative position between the vehicle smart key and the vehicle through the wireless cellular network module, Bluetooth module, and ultra-wideband module respectively. When the relative position of the vehicle smart key and the vehicle is far apart, the control module obtains the current location of the vehicle smart key through the wireless cellular network module, calculates the distance and direction of the vehicle in combination with the vehicle's location, and displays it in the display module, and updates the data in real time according to the user's movement. When the relative position of the vehicle smart key and the vehicle is at a medium distance, the control module receives the signal from the Bluetooth antenna through the Bluetooth module, calculates the relative position of the vehicle smart key and the vehicle, displays it through the display module, and updates the data in real time according to the user's movement. When the vehicle smart key is close to the vehicle, it uses an ultra-wideband module to communicate with an ultra-wideband anchor point to locate the vehicle.

5. The vehicle locating method as described in claim 4, characterized in that: The control module determines the distance between the vehicle's smart key and the vehicle in real time, and switches to position detection mode when the distance reaches the determination threshold.

6. The vehicle locating method as described in claim 4, characterized in that: The wireless cellular network positioning method is as follows: the control module collects the positioning data of the vehicle smart key through the wireless cellular network module, including satellite positioning data and base station positioning data, and calculates the final positioning data of the vehicle smart key through a weighted average algorithm, and calculates the relative position of the vehicle smart key and the vehicle by combining the vehicle's positioning data.

7. The vehicle locating method as described in claim 4, characterized in that: The vehicle's position is calculated as follows: the signal strength value of the Bluetooth antenna is converted into a distance value, and the relative coordinates of the vehicle's smart key are calculated using the fixed coordinates of the four antennas to determine the vehicle's direction relative to the smart key.

8. The vehicle locating method as described in claim 4, characterized in that: The vehicle's location is calculated by taking the flight time of the ultra-wideband signal from the smart key to the anchor point, and combining this with the propagation speed of the ultra-wideband signal to calculate the distance.

9. The vehicle locating method as described in claim 4, characterized in that: When the distance between the vehicle's smart key and the vehicle reaches a set value, the vehicle triggers the welcome function, and the doors automatically unlock.

Images