Digital vehicle key, vehicle-mounted communication system and method

Abstract

The embodiment of the invention discloses a digital vehicle key and a vehicle-mounted communication system and method. The digital vehicle key can comprise a power supply module, a sensor and a first wireless communication module. The sensor is coupled with the power supply module and the first wireless communication module and used for collecting mobile data of the digital car key and sending the mobile data to the first wireless communication module, and the mobile data comprises the mobile speed and the mobile direction; and the first wireless communication module is used for scanning a first wireless broadcast signal sent by a target vehicle and performing pairing connection with the target vehicle so as to send mobile data to the target vehicle and further determine the current distance between the digital vehicle key and the target vehicle. According to the method provided by the embodiment of the invention, the distance between the digital vehicle key and the vehicle is determined in an auxiliary manner by using the mobile data of the digital vehicle key, so that the problem of inaccurate distance measurement and calculation caused by obstacles on a wireless broadcast signal transmission path or jumping of the measurement and calculation distance in a short time can be solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a digital vehicle key, a vehicle-mounted communication system and a method. Background Art

[0002] At present, the first Bluetooth module is used for distance measurement at long distances (such as when the distance between the digital car key and the target vehicle is greater than 20 meters and less than 60 meters), and the UWB module is used for distance measurement at close distances (such as when the distance between the digital car key and the target vehicle is less than 20 meters). However, vehicles are mostly used in complex environments, and there are many factors that lead to poor communication signals and inability to achieve accurate positioning. Therefore, how to provide a method to ensure the accuracy of distance measurement in different communication signal transmission environments is a problem that technicians in this field urgently need to solve. Summary of the invention

[0003] One purpose of the present application is to provide a digital car key, a vehicle-mounted communication system and a method, which can utilize the movement data of the digital car key (such as the movement direction and / or the movement speed) to assist in determining the actual distance between the digital car key and the vehicle, thereby helping to avoid a large deviation between the measured distance and the actual distance caused by obstacles in the wireless broadcast signal transmission path, thereby further ensuring the normal interaction between the vehicle and other functions of the data car key.

[0004] In a first aspect, the present application provides a digital car key, which may include a power supply module, a sensor, and a first wireless communication module;

[0005] The power supply module is coupled with the sensor and the first wireless communication module, and can be used to provide power to the digital car key;

[0006] The sensor is coupled to the first wireless communication module and can be used to collect movement data of the digital car key and send the movement data to the first wireless communication module, where the movement data includes movement speed and movement direction;

[0007] The first wireless communication module is used to scan the first wireless broadcast signal emitted by the target vehicle and pair with the target vehicle to send movement data to the target vehicle and thereby determine the current distance between the digital car key and the target vehicle; wherein the current distance between the digital car key and the target vehicle is determined based on the moving direction, moving speed and signal strength of the paired connection between the first wireless communication module and the target vehicle.

[0008] In a possible embodiment, the first wireless communication module includes a first Bluetooth module and a first positioning module. When the distance between the digital car key and the target vehicle is within a first preset range, the first Bluetooth module sends a pairing signal to pair with the target vehicle; when the distance between the digital car key and the target vehicle is within a second preset range, the first positioning module sends a pairing signal to pair with the target vehicle to transmit a positioning signal, and the first preset range is larger than the second preset range.

[0009] In one possible implementation, the sensor is a six-axis gyroscope.

[0010] In another possible implementation, the six-axis gyroscope includes an acquisition chip, a first resistor and a first capacitor, and the acquisition chip includes a first data output pin, a second data output pin, an operating voltage input / output pin, a programming / erase voltage pin, a pull-down interrupt pin, a first empty pin, a clock pin, a second empty pin, a current sampling pin, a ground pin, a third empty pin and an operating voltage pin;

[0011] The first data output pin, the second data output pin, the clock pin and the current sampling pin of the acquisition chip can be used to connect to the first Bluetooth module;

[0012] The programming / erasing voltage pin of the acquisition chip is grounded, and the interrupt pin is pulled down to couple with the working voltage pin via the first resistor;

[0013] The working voltage input / output pin of the acquisition chip is coupled to the working voltage pin, the working voltage pin is grounded via the first capacitor, and the working voltage pin is coupled to the low voltage difference linear regulator, and can be used to receive the stable voltage transmitted by the low voltage difference linear regulator;

[0014] The pull-down interrupt pin of the acquisition chip is connected to the input end of the first Bluetooth module.

[0015] In another possible implementation, the digital car key further includes: a voltage detection unit and a first wireless charging module;

[0016] The two ends of the voltage detection unit are respectively coupled to the power supply module and the first Bluetooth module, and can be used to collect voltage data of the power supply module at a first preset frequency after receiving a detection indication signal sent by the first wireless communication module;

[0017] The first wireless charging module is coupled to the power supply module and can be used to charge the power supply module.

[0018] In another possible implementation, the first wireless charging module includes a charging control unit, a wireless charging coil, and a coil management chip;

[0019] The two ends of the charging control unit are respectively coupled to the power supply module and the coil management chip, and can be used to send an indication signal to the first wireless communication module, and the indication signal can be used to transmit the status information of the power supply module to the first Bluetooth module;

[0020] The wireless charging coil is coupled to the coil management chip, and can be used to receive electromagnetic energy sent by the second wireless charging module of the target vehicle and convert the electromagnetic energy into electrical energy;

[0021] The coil management chip can be used to monitor the working status of the wireless charging coil and convert the electric energy converted by the wireless charging coil into a stable output voltage. The stable output voltage flows to the power supply module through the charging control unit.

[0022] In another possible implementation, the digital vehicle key further includes: a data encryption module and a low-dropout linear regulator;

[0023] The data encryption module is coupled with a low voltage dropout linear regulator and can be used to obtain a stable voltage via the low voltage dropout linear regulator;

[0024] The low voltage difference linear regulator is coupled with the power supply module, the first wireless communication module and the six-axis gyroscope, and can be used to convert the unstable voltage output by the power supply module into a stable voltage, and transmit the stable voltage to the data encryption module, the first wireless communication module and the six-axis gyroscope.

[0025] In another possible implementation, the data encryption module includes an encryption chip and an encryption switch circuit;

[0026] The encryption switch circuit can be used to turn on the circuit between the encryption chip and the low-dropout linear regulator when the second wireless broadcast signal sent by the target vehicle contains an unlocking instruction signal, so that the encryption chip is in a working state;

[0027] The encryption chip is coupled with the encryption switch circuit and the first wireless communication module, and can be used to store an unlocking key, and can be used to send the unlocking key to the first wireless communication module. The unlocking key can be used to instruct the target vehicle to open the door.

[0028] In another possible implementation, the digital vehicle key further includes: a button and a lamp;

[0029] The lamp is coupled with the button and the first Bluetooth module, and can be used to flash when the user presses and / or clicks the button; based on the control instructions of the first Bluetooth module, it can be used to flash when the digital car key is charging, and can be used to flash when the voltage of the digital car key is lower than a preset threshold.

[0030] In a second aspect, the present application provides a vehicle-mounted communication system, including:

[0031] A digital car key as described in the first aspect and any possible implementation manner of the first aspect;

[0032] A target vehicle is communicatively connected to the digital vehicle key.

[0033] In a third aspect, the present application provides a vehicle-mounted communication method, which can be used in the vehicle-mounted communication system as described in the second aspect, and the method may include:

[0034] Collecting movement data of the digital car key through the sensor of the digital car key, where the movement data includes movement speed and movement direction;

[0035] Wirelessly pairing with a target vehicle through a first wireless communication module of the digital car key, and sending mobile data to the target vehicle through the first wireless communication module;

[0036] The distance between the digital car key and the target vehicle is determined by the target vehicle according to the moving direction, moving speed and the signal strength of the paired connection between the first wireless communication module and the target vehicle.

[0037] In a possible implementation, determining the current distance between the digital vehicle key and the target vehicle according to the moving direction, moving speed, and signal strength of the paired connection between the first wireless communication module and the target vehicle by the target vehicle may include:

[0038] Obtaining a first estimated distance value between the digital car key and the vehicle according to the signal strength of the digital car key at a first position of the target vehicle, wherein the first position is an initial position where the digital car key scans the first wireless broadcast signal and achieves pairing with the target vehicle;

[0039] Obtaining a motion trajectory of the digital car key from a first position to a second position according to a moving direction and a moving speed of the target vehicle, and determining a displacement value of the digital car key from the first position to the second position based on the motion trajectory, wherein the second position is a current position of the digital car key;

[0040] The second estimated distance between the digital car key and the target vehicle when the digital car key is at the second position is obtained by using the signal strength of the target vehicle according to the digital car key being at the second position.

[0041] Determine an obstacle parameter by using the target vehicle according to the displacement value, the first estimated distance value, and the second estimated distance value; the obstacle parameter is used to indicate the degree of signal obstruction when the digital car key is paired with the target vehicle;

[0042] The current distance between the digital vehicle key and the target vehicle is determined by the target vehicle based on the second estimated distance value and the obstacle parameters.

[0043] In a possible implementation, determining the displacement value of the digital vehicle key from the first position to the second position according to the movement data by the target vehicle includes:

[0044] Determine the moving trajectory of the digital car key according to the moving direction of the pre-digital car key at the first position and the second position by the target vehicle;

[0045] The displacement value of the digital car key is determined by the target vehicle according to the moving trajectory, the moving speed of the digital car key at the first position and the second position, and the time interval for obtaining the movement data corresponding to the digital car key at the first position and the second position.

[0046] In a possible implementation, the current distance between the digital vehicle key and the target vehicle is determined by the target vehicle based on the second estimated distance value and the obstacle parameter, satisfying the following formula:

[0047] y=L×a

[0048] y is the current distance between the digital car key and the target vehicle; L is the second estimated distance value; a is the obstacle parameter.

[0049] In a possible implementation, the obstacle parameter is determined by the target vehicle according to the displacement value, the first estimated distance value, and the second estimated distance value;

[0050]

[0051] S is the first estimated distance value, and D is the displacement value.

[0052] In another possible implementation, the method may further include:

[0053] When the current distance between the digital car key and the target vehicle is less than a predetermined value, an unlocking key is sent to the target vehicle via the digital car key;

[0054] The unlock key is received through the target vehicle and the door of the target vehicle closest to the digital vehicle key is unlocked.

[0055] It can be seen that the present application can utilize the mobile data of the digital car key to assist in determining the distance between the digital car key and the vehicle, which helps to solve the problem of inaccurate distance measurement caused by obstacles in the wireless broadcast signal transmission path and / or the measured distance jumping in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 A schematic diagram of the architecture of an in-vehicle communication system provided in an embodiment of the present application;

[0058] Figure 2 A schematic diagram of the composition of a digital car key provided in an embodiment of the present application;

[0059] Figure 3 A schematic diagram of a circuit for enhancing Bluetooth communication distance provided in an embodiment of the present application;

[0060] Figure 4 A schematic diagram of the structure of a sensor provided in an embodiment of the present application;

[0061] Figure 5 A schematic diagram of the structure of an encryption chip provided in an embodiment of the present application;

[0062] Figure 6 A schematic diagram of the structure of an encryption switch circuit provided in an embodiment of the present application;

[0063] Figure 7 A schematic diagram of the structure of a voltage detection unit provided in an embodiment of the present application;

[0064] Figure 8 A schematic diagram of the structure of a target vehicle provided in an embodiment of the present application;

[0065] Fig. 9 A schematic diagram of a vehicle communication system provided in an embodiment of the present application;

[0066] Fig.10 A schematic diagram of the composition of another digital car key provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0069] Reference to "embodiments" herein means that a particular feature, result, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In order to better understand the technical solution of the embodiment of the present application, Figure 1 The vehicle-mounted communication system involved in the embodiment of the present application is described in detail.

[0071] See also Figure 1 , is a schematic diagram of the architecture of an in-vehicle communication system provided in an embodiment of the present application, the system may include: a digital car key 110 and a target vehicle 120.

[0072] Among them, see Figure 2 , Figure 2 A schematic diagram of the composition of a digital car key provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the digital car key 110 may include a wireless charging module 210 (which may include a charging control unit 211, a wireless charging coil 212 and a coil management chip 213), a voltage detection unit 220, a power supply module 230, a data encryption module 240 (which may include an encryption chip 241 and an encryption switch circuit 242), a low-voltage difference linear regulator 250, a first Bluetooth module 260, a first positioning module 270, a sensor 280, a lamp 290 and a button 291.

[0073] The wireless charging module 210 is coupled with the power supply module 230 and can be used to charge the power supply module 230. The wireless charging module 210 can include a charging control unit 211, a wireless charging coil 212 and a coil management chip 213. The two ends of the charging control unit 211 are respectively coupled with the power supply module 230 and the coil management chip 213, and can be used to manage the charging operation of the power supply module 230. When the digital car key is being charged, the charging control unit 211 can send an indication signal of "charging" to the first Bluetooth module 260; when the digital car key is fully charged, the charging control unit can send an indication signal of "charging completed" to the first Bluetooth module 260. The wireless charging coil 212 is coupled with the coil management chip 213 and can be used to receive the electromagnetic energy sent by the vehicle wireless charging module and convert the electromagnetic energy into electrical energy. The coil management chip 213 can be used to monitor the working state of the wireless charging coil 212 and convert the electrical energy converted by the wireless charging coil 212 into a stable output voltage, which can flow to the power supply module 230 via the charging control unit 211. Possibly, the power supply module 230 may be in the form of a rechargeable lithium battery.

[0074] Furthermore, the two ends of the voltage detection unit 220 are respectively coupled to the power supply module 230 and the first Bluetooth module 260. When the sensor 280 detects that the digital car key is in a moving state, the first Bluetooth module 260 will send an indication signal to the voltage detection unit 220, which can instruct the voltage detection unit 220 to collect the voltage data of the power supply module 230 at a certain frequency (such as once every 30 seconds).

[0075] The data encryption module 240 is coupled with the low-dropout linear regulator 250, and a stable voltage can be obtained through the low-dropout linear regulator 250. The data encryption module 240 may include an encryption chip 241 and an encryption switch circuit 242. The data encryption module 240 may be used to store an unlocking key. In this case, when the wireless broadcast signal sent by the vehicle contains an indication signal of "sending an unlocking key", the encryption switch circuit 242 will conduct the circuit line between the encryption chip 241 and the low-dropout linear regulator 250, so that the encryption chip 241 is in a working state, so that the encryption chip 241 will transmit the unlocking key to the vehicle via the corresponding wireless communication module, thereby achieving the purpose of unlocking the vehicle. Possibly, the data encryption module 240 can also be used to encrypt the wireless broadcast signals of the first Bluetooth module 260 and / or the first positioning module 270 in a specific manner. In this case, in response to the first Bluetooth module 260 and / or the first positioning module 270 generating wireless broadcast signals, the encryption switch circuit 242 will turn on the circuit line between the encryption chip 241 and the low-voltage difference linear regulator 250, so that the encryption chip 241 is in a working state, so that the encryption chip 241 will encrypt the relevant wireless broadcast signals and return the encrypted wireless broadcast signals to the corresponding wireless communication module.

[0076] The low voltage difference linear regulator 250 is coupled to the power supply module 230, the data encryption module 240, the first Bluetooth module 260, the first positioning module 270 and the sensor 280 respectively, and can convert the unstable voltage output by the power supply module 230 into a stable voltage of 3V. The data encryption module 240, the first Bluetooth module 260, the first positioning module 270 and the sensor 280 obtain a stable voltage via the low voltage difference linear regulator 250, which helps to ensure that the frequency of the wireless broadcast signal transmitted by the first Bluetooth module 260 and the first positioning module 270 will not change due to changes in voltage, thereby helping the vehicle to more accurately calculate the actual distance between it and the digital car key, thereby improving the accuracy and stability of distance estimation.

[0077] The first Bluetooth module 260 and the first positioning module 270 can be collectively referred to as the first wireless communication module of the digital car key. When the distance between the digital car key 110 and the target vehicle 120 is within a first preset range, the first Bluetooth module 260 sends a pairing signal to pair with the target vehicle 120; when the distance between the digital car key 110 and the target vehicle 120 is within a second preset range, the first positioning module 270 sends a pairing signal to pair with the target vehicle 120 to transmit a positioning signal, the first preset range is larger than the second preset range, and the maximum value in the second preset range is a predetermined value.

[0078] The first Bluetooth module 260 may be a Bluetooth Microcontroller Unit (BTMCU), which may be used to send Bluetooth signals via an antenna 261 coupled thereto, and may also receive various indication signals in the digital car key (such as a "charging" indication signal sent by the charging control unit 211, etc.), and / or receive indication signals sent by the vehicle via the antenna 261 coupled thereto (such as an indication signal for instructing the digital car key to send a wireless broadcast signal in a specific wireless communication manner, etc., which may be referred to in detail in the accompanying drawings). Figure 1 and / or Figure 2 The first Bluetooth module 260 can be used to process the first wireless broadcast signal sent by the target vehicle 120, and can also send an indication signal to the components in the digital car key (such as instructing the voltage detection unit 220 to collect the voltage data of the power supply module 230, instructing the encryption chip 241 to turn on the circuit between the encryption chip 241 and the low voltage difference linear regulator 250, and instructing the data encryption module to encrypt the wireless broadcast data, etc.). Furthermore, the first Bluetooth module 260 can also be used to scan the first wireless broadcast signal sent by the target vehicle 120, and pair with the target vehicle 120 to send movement data to the target vehicle 120, so that the target vehicle 120 can determine the distance between the digital car key 110 and the target vehicle 120; wherein the distance between the digital car key 110 and the target vehicle 120 is determined based on the moving direction, the moving speed, and the signal strength of the pairing connection between the first wireless communication module and the target vehicle.

[0079] The first positioning module 270 may be an ultra wide band (UWB) module, which may send a wireless broadcast signal to the vehicle via an antenna 271 coupled thereto based on the indication signal of the first Bluetooth module 260, thereby helping the vehicle to more accurately calculate the actual distance between the digital car key and the vehicle.

[0080] The sensor 280 may be a six-axis gyroscope, coupled with the low-dropout linear regulator 250, the first Bluetooth module 260, and the first positioning module 270, and may collect movement data of the digital car key, and the movement data may include movement speed and movement direction, and may also include movement acceleration, etc. The sensor 280 may also send the movement data of the digital car key to the vehicle via the first Bluetooth module 260 and the first positioning module 270. The sensor 280 may also send an indication signal indicating "the vehicle is moving" information to the first Bluetooth module 260 when detecting that the digital car key is in a moving state.

[0081] The lamp 290 is coupled to the first Bluetooth module 260, and when the user presses / clicks the button 291 of the digital car key, the first Bluetooth module 260 will indicate that the lamp 290 flashes; when the digital car key is charging, the first Bluetooth module 260 will indicate that the lamp 290 flashes; when the voltage of the digital car key is lower than a preset threshold and the digital car key is in a moving state, the first Bluetooth module 260 will indicate that the lamp 290 flashes through a control command. In addition, the number of buttons 291 can be 4.

[0082] based on Figure 2 , this application also provides Figures 3 to 7 Related circuit or structure diagram.

[0083] in, Figure 3 The schematic diagram of the structure of a circuit for enhancing the Bluetooth communication distance provided by the embodiment of the present application is as follows. Figure 3 As shown, the circuit includes a signal power amplifier chip 310, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a resistor R1 and an antenna ANT.

[0084] Among them, the communication port of the first Bluetooth module 260 can be connected to the TXEN and RXEN terminals of the signal power amplifier chip, and the high and low levels output by the first Bluetooth module 260 can be used to control the working state of the signal power amplifier chip 310. When the digital car key needs to transmit a Bluetooth wireless broadcast signal, the TXEN terminal of the signal power amplifier chip 310 is high and the RXEN terminal is low; when the Bluetooth wireless broadcast signal is transmitted and the digital car key needs to receive the wireless broadcast signal sent by the vehicle, the RXEN of the signal power amplifier chip 310 is high and the TXEN terminal is low; when the first Bluetooth module 260 is in a dormant state (neither receiving nor transmitting wireless broadcast signals), the RXEN terminal of the signal power amplifier chip 310 is grounded and the TXEN terminal is low. Figure 3 The circuit shown also adds a double π-type signal filtering circuit between the signal power amplifier circuit and the antenna ANT. This circuit can filter out signals outside the Bluetooth frequency band, which helps to improve the signal reception effect and enhance the ability of the Bluetooth chip to receive wireless broadcast signals. Figure 3 The processing of the circuit shown can increase the communication coverage range of the Bluetooth wireless broadcast signal to 70 meters.

[0085] The double-π signal filtering and finishing circuit is composed of capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6 and resistor R1. The two ends of capacitor C1 are respectively coupled to the antenna ANT pin of the signal power amplifier chip 310 and the ground wire, the two ends of resistor R1 are respectively coupled to the antenna ANT pin of the signal power amplifier chip 310 and one end of capacitor C2, the other end of capacitor C2 is coupled to the ground wire, one end of capacitor C3 is coupled to the connection point of resistor R1 and capacitor C2, the other end of capacitor C3 is coupled to capacitor C4, the other end of capacitor C4 is coupled to the ground wire, capacitor C5 is coupled to the connection point of capacitor C3 and capacitor C4, the other end of capacitor C5 is coupled to capacitor C6, and the other end of capacitor C6 is coupled to the ground wire.

[0086] More specifically, one end of the antenna ANT is coupled to the connection point of the capacitor C5 and the capacitor C6, and the other end is coupled to one end of the capacitor C7. The other end of the capacitor C7 is coupled to the ground line.

[0087] Will Figure 3 The circuit shown is added to Figure 2 The corresponding position (between the first Bluetooth module 260 and the antenna 261) helps to improve Figure 3 The effect of the digital car key signal reception shown enhances the ability of the first Bluetooth module 260 (which can be understood as a BTMCU module) in the digital car key to receive wireless broadcast signals.

[0088] in, Figure 4 This is a schematic diagram of the structure of a sensor provided in an embodiment of the present application. Figure 4 As shown, the data acquisition module may include an acquisition chip 281, a resistor R2 and a capacitor C8.

[0089] Among them, the first data output pin (i.e. Figure 4 SPIDATAOUT pin in the SPIDATAOUT pin), the second data output pin (i.e. Figure 4 SPIDATAIN pin in the clock pin (ie Figure 4 SPICLK pin in the Figure 4 The CS pin in the acquisition chip 281 is used to connect to the first Bluetooth module 260, so that the collected mobile data of the digital car key can be transmitted to the first Bluetooth module 260. In addition, the programming / erasing voltage pin (i.e. Figure 4 The VPP pin in the Figure 4 The INTN pin in the circuit is connected to the working voltage pin (i.e. Figure 4 VDD pin in the Figure 4The VDDIO pin in the first Bluetooth module 260 is coupled to the working voltage pin, and the working voltage pin is grounded via capacitor C8. The working voltage pin can receive a 3V stable voltage transmitted by a low voltage difference linear regulator. The pull-down interrupt pin can be connected to the general input / output port of the first Bluetooth module 260. When the key is in a moving state, the pull-down interrupt pin becomes a high level, thereby triggering the first Bluetooth module 260 to start working (i.e., start receiving the vehicle's wireless broadcast signal); when the key is in a stationary state, the pull-down interrupt pin becomes a low level, thereby instructing the first Bluetooth module 260 to stop working, which helps to reduce the power consumption of the digital car key.

[0090] During the production of digital car keys, the factory can use encryption chips to achieve signal encryption. For details, please refer to Figure 5 , is a schematic diagram of the structure of an encryption chip provided in an embodiment of the present application. Figure 5 As shown, the reset pin (i.e. Figure 5 RST pin in), clock pin (i.e. Figure 5 CLK pin in the Figure 5 The encryption chip 241 can write the encryption-related program and the initial key (which can be considered as the unlocking key) into the encryption chip 241 through the general input / output pin (i.e. Figure 5 GPIO2 pin in the Figure 5 GPIO0 pin in the Figure 5 GPIO1 pin in the Figure 5 The GPIO3 pin in the Bluetooth module communicates with the first Bluetooth module 260.

[0091] See also Figure 6 , is a schematic diagram of the structure of an encryption switch circuit provided in an embodiment of the present application. Figure 6 As shown, the encryption switch circuit includes a diode D1, a resistor R3, a resistor R4, a MOS tube Q1, a transistor Q2, a resistor R5, a resistor R6, a capacitor C9 and a capacitor C10.

[0092] Among them, the positive electrode of the diode D1 is coupled with the drain of the MOS tube Q1, and the negative electrode of the diode D1 is coupled with the source of the MOS tube Q1. One end of the resistor R3 is coupled with the source of the MOS tube for receiving the 3V stable voltage transmitted by the low voltage difference linear regulator, and the other end is coupled with the gate of the MOS tube Q1. One end of the resistor R4 is coupled with the gate of the MOS tube Q1, and the other end is coupled with the collector of the transistor Q2. One end of the capacitor C9 is coupled with the drain of the MOS tube Q1, and the other end is grounded. One end of the capacitor C10 is coupled with the drain of the MOS tube Q1, and the other end is grounded. The base of the transistor Q2 is coupled with the encryption chip via the resistor R5, and the emitter of the transistor Q2 is grounded. One end of the resistor R6 is coupled with the base of the transistor Q2, and the other end is coupled with the emitter of the transistor Q2.

[0093] Exemplarily, the first Bluetooth module 260 can control whether the encryption chip works by controlling the conduction of the transistor Q2. For example, when the first Bluetooth module 260 outputs a high level to the base of the transistor Q2, the transistor Q2 is turned on, so the gate of the MOS transistor Q1 is grounded, so that the MOS transistor Q1 is turned on at a low level, so that the encryption chip can obtain voltage via the resistor R5 and start working. Conversely, when the first Bluetooth module 260 outputs a low level to the transistor Q2, the transistor Q2 is powered off, so the encryption chip stops working because it cannot obtain voltage.

[0094] in, Figure 7 This is a schematic diagram of the structure of a voltage detection unit provided in an embodiment of the present application. Figure 7 As shown, the voltage detection unit may include a diode D2, a resistor R7, a resistor R8, a MOS transistor Q3, a transistor Q4, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C11 and a capacitor C12.

[0095] Among them, the positive electrode of the diode D2 is coupled with the drain of the MOS tube Q3, and the negative electrode of the diode D2 is coupled with the source of the MOS tube Q3. One end of the resistor R7 is coupled with the source of the MOS tube for receiving the 3V stable voltage transmitted by the low voltage difference linear regulator, and the other end is coupled with the gate of the MOS tube Q3. One end of the resistor R8 is coupled with the gate of the MOS tube Q3, and the other end is coupled with the collector of the triode Q4. One end of the capacitor C11 is coupled with the drain of the MOS tube Q3, and the other end is grounded. One end of the capacitor 12 is coupled with the drain of the MOS tube Q3, and the other end is grounded. The drain of the MOS tube Q3 is grounded via the resistor R11 and the resistor R12, and the analog / digital converter ADC port of the first Bluetooth module 260 is coupled with the connection point of the resistor R11 and the resistor R12, so that the analog / digital converter ADC port of the first Bluetooth module 260 can measure VBAT_DET, and VBAT_DET can be used to determine the voltage of the battery. The base of transistor Q4 is coupled to the encryption chip via resistor R9, and the emitter of transistor Q4 is grounded. One end of resistor R10 is coupled to the base of transistor Q4, and the other end is coupled to the emitter of transistor Q4.

[0096] In order to avoid unnecessary energy consumption caused by frequent reading of VBAT_DET, the embodiment of the present application uses transistor Q4 to adjust the working state of the voltage detection unit. When the battery voltage needs to be detected, when the first Bluetooth module 260 outputs a high level to the base of the transistor Q4, the transistor Q4 is turned on, so the gate grounding of the MOS tube Q3 becomes a low level, so that the source to drain of the MOS tube Q3 is turned on, and the battery voltage is connected to the ground via the resistor R11 and the resistor R12. The first Bluetooth module 260 can detect the VBAT_DET voltage through the analog / digital converter ADC port. It should be noted that the VBAT_DET voltage is half of the actual battery voltage.

[0097] For more information, see Figure 8 , Figure 8 A schematic diagram of the structure of a target vehicle provided in an embodiment of the present application is shown in FIG. Figure 8 As shown, the target vehicle 120 may include a second wireless communication module 810 , a computing module 820 , a control module 830 , and a wireless charging module 840 .

[0098] The second wireless communication module 810 is coupled with the computing module 820, and may include a second Bluetooth module and a second positioning module, wherein the second Bluetooth module is used to communicate with the first Bluetooth module of the digital car key, and the second positioning module is used to communicate with the first positioning module of the digital car key. The second wireless communication module 810 may be used to broadcast a first wireless broadcast signal to the outside at a first preset period before establishing a communication connection with the digital car key; after the digital car key scans the first wireless broadcast signal sent by the target vehicle 120, the digital car key will send a matching signal to the target vehicle 120 to establish a communication connection with the target vehicle 120. After establishing a communication connection with the digital car key, the target vehicle 120 may send a second wireless broadcast signal to the digital car key at a second preset period, which may be used to indicate the wireless communication mode of the digital car key and the transmission frequency of the third wireless broadcast signal.

[0099] The second wireless communication module 810 may also be used to receive a third wireless broadcast signal sent by the digital car key according to a second preset period, where the third wireless broadcast signal may include movement data of the digital car key, where the movement data may include a movement direction and a movement speed, and where the movement data may also include a movement acceleration;

[0100] In a possible implementation, the calculation module 820 may obtain a first estimated distance value between the digital car key and the vehicle according to the signal strength of the digital car key at a first position; the first position is an initial position where the digital car key scans the first wireless broadcast signal and achieves pairing with the target vehicle;

[0101] The calculation module 820 may also determine a motion trajectory of the digital car key from the first position to the second position according to the movement data, and determine a displacement value of the digital car key from the first position to the second position based on the motion trajectory, where the second position is the current position of the digital car key;

[0102] The calculation module 820 can also obtain a second estimated distance value between the digital car key and the target vehicle when the digital car key is at the second position according to the signal strength of the digital car key at the second position;

[0103] The calculation module 820 can also determine the obstacle parameters according to the displacement value, the first estimated distance value and the second estimated distance value, and determine the current distance between the digital car key and the target vehicle based on the second estimated distance value and the obstacle parameters through the target vehicle.

[0104] The calculation module 820 may also determine the current distance between the digital vehicle key and the target vehicle based on the second estimated distance value and the obstacle parameter, satisfying the following formula:

[0105] y=L×a

[0106] y is the current distance between the digital car key and the target vehicle; L is the second estimated distance value; a is the obstacle parameter.

[0107] The calculation module 820 may also determine obstacle parameters according to the displacement value, the first estimated distance value, and the second estimated distance value;

[0108]

[0109] S is the first estimated distance value, and D is the displacement value.

[0110] For example, see Fig. 9 , Fig. 9 A schematic diagram of a vehicle communication system provided in an embodiment of the present application. Fig. 9 As shown, the first position is the position where the digital car key can establish the farthest Bluetooth connection with the target vehicle (the distance between the first position and the target vehicle can be regarded as 70 meters), and the second position is the position where the digital car key can establish the farthest UWB connection with the target vehicle (the distance between the second position and the target vehicle can be regarded as 10 meters). The target vehicle can determine the possible movement trajectory of the digital car key according to the movement direction of the digital car key at the first position and the second position ( Fig. 9 Only one possible movement trajectory of the digital car key is shown in FIG. 1 ). If the displacement value of the digital car key from the first position to the second position is 55; the obstacle parameter can be calculated Furthermore, the distance from the digital car key to the target vehicle in the second position can be calculated according to the formula y=L×a, and y=10×91.2%=9.12m, that is, the current distance between the digital car key and the target vehicle is 9.12 meters. In the embodiment provided in the present application, the actual distance between the digital car key and the target vehicle in the second position is less than 10 meters, so that the displacement direction of the digital car key from the first position to the second position is close to the displacement direction of the digital car key from the first position to the target vehicle. The determined obstacle parameters can roughly express the degree of obstruction encountered by the car key during pairing. The purpose of the present application to determine the current distance between the digital car key and the target vehicle when the actual distance between the digital car key and the vehicle is less than 10 meters is to send an unlock key to the target vehicle through the digital car key when the current distance between the digital car key and the target vehicle is less than a predetermined value; receive the unlock key through the target vehicle and unlock the door of the target vehicle closest to the digital car key.

[0111] In another possible implementation, the calculation module 820 is coupled to the control module 830 and can be used to determine the distance between the digital vehicle key and the vehicle according to the third wireless broadcast signal received at each time node, and obtain a first estimated distance value corresponding to each time node;

[0112] The calculation module 820 can also be used to determine the displacement value of the digital car key according to the first time node, the second time node and the movement data, the first time node is the time node when the target vehicle first receives the third wireless broadcast signal, and the second time node is the time node when the target vehicle receives the third wireless broadcast signal the latest. Exemplarily, assuming that the first time node is 10:12:10 in the morning (the corresponding moving direction is due north, and the corresponding moving speed is 1 meter / second), and the second time node is 10:12:15 in the morning (the corresponding moving direction is due north, and the corresponding moving speed is 1 meter / second), it can be considered that the digital car key is in a state of uniform motion toward the due north direction during the time period from 10:12:10 to 10:12:15, and it can be concluded that the displacement value of the digital car key in the time period from the first time node to the second time node is 5 meters.

[0113] The calculation module 820 can also be used to calculate a first difference between a first estimated distance value corresponding to a first time node and a first estimated distance value corresponding to a second time node. For example, if the vehicle determines that the first estimated distance value corresponding to the first time point is 50 meters, and the first estimated distance value determined at the second time node is 42 meters, then the first difference can be determined to be 8 meters; if the vehicle determines that the first estimated distance value corresponding to the first time point is 50 meters, and the first estimated distance value determined at the second time node is 55 meters, then the first difference can be determined to be -5 meters.

[0114] The calculation module 820 can also be used to determine the obstacle parameter according to the absolute value of the first difference and the displacement value when the absolute value of the first difference and the absolute value of the second difference of the displacement value is greater than or equal to the first preset value, and determine the current distance between the digital car key and the target vehicle according to the obstacle parameter. The obstacle parameter can be used to indicate the degree to which the third wireless broadcast signal is obstructed in the propagation path.

[0115] Among them, the current distance between the digital car key and the target vehicle is obtained by the vehicle based on the first difference between the first estimated distance value (generated according to the strength of the first wireless broadcast signal) and the displacement value (generated according to the movement data of the digital car key) corresponding to two time nodes, which can be expressed as the result of the vehicle estimating the distance between itself and the digital car key, aiming to obtain a value closer to the actual distance between the vehicle and the digital car key. It should be noted that the obstacle parameter can be used to indicate the degree to which the third wireless broadcast signal is obstructed in the propagation path.

[0116] It can be seen that the embodiment of the present application can calculate the degree of obstruction of the third wireless broadcast signal in the propagation path according to relevant data and obtain obstacle parameters, and then estimate the actual distance between the digital car key and the vehicle according to the obstacle parameters, which helps to avoid the situation where there is a large deviation between the measured distance and the actual distance due to obstacles in the wireless broadcast signal transmission path, thereby further ensuring the normal interaction between the vehicle and other functions of the digital car key.

[0117] In a possible implementation manner, the target vehicle may further include:

[0118] The calculation module 820 may also be configured to send a second wireless broadcast signal when the absolute value of the difference between the absolute value of the first difference and the absolute value of the displacement is greater than or equal to a first preset value; or

[0119] The calculation module 820 may also be configured to send a second wireless broadcast signal when the absolute value of the difference between the first difference and the displacement value is smaller than a first preset value.

[0120] Exemplarily, when the current distance between the digital car key and the target vehicle is less than or equal to the first preset distance (such as 70 meters) and greater than the second preset distance (such as 10 meters), the third wireless broadcast signal can be used to instruct the digital car key to send the first wireless broadcast signal once every 2 seconds in the first wireless communication mode (such as Bluetooth); when the current distance between the digital car key and the target vehicle is less than or equal to the second preset distance (such as 10 meters), the second wireless broadcast signal can be used to instruct the digital car key to send the first wireless broadcast signal once every 1 second in the second wireless communication mode (such as UWB). Furthermore, when the current distance between the digital car key and the target vehicle is less than or equal to the third preset distance (such as 4 meters), the second wireless broadcast signal can be used to instruct the digital car key to send the third wireless broadcast signal once every 0.05 seconds in the second wireless communication mode (such as UWB). It should be noted that compared with the first wireless communication mode, the second wireless communication mode enables the vehicle to more accurately calculate the current distance between the digital car key and the target vehicle. Furthermore, the above examples of preset distances (first preset distance, second preset distance and third preset distance) and transmission frequencies (such as "every 2 seconds", "every 1 second" and "every 0.05 seconds") are only for illustrating the embodiment method of the present application in more detail and should not constitute a limitation on the present application. The specific preset distances and transmission frequencies are set by technicians according to actual conditions.

[0121] In another possible embodiment, the wireless communication method may include a first wireless communication method (such as using a first Bluetooth module to send a third wireless broadcast signal) and a second wireless communication method (such as using a second positioning module to send a third wireless broadcast signal). The second wireless communication module 810 may include a second Bluetooth module 811 that communicates using the first wireless communication method and a second positioning module 812 that communicates using the second wireless communication method. The second positioning module 812 is located at the four ends of the vehicle.

[0122] In another possible implementation, the target vehicle may further include: a control module 830;

[0123] When the current distance between the digital car key and the target vehicle is less than a second preset value, the second wireless broadcast signal may also be used to instruct the digital car key to send an unlocking key;

[0124] The second wireless communication module 810 may also be used to receive an unlocking key from a digital vehicle key;

[0125] The control module 830 can be used to unlock the vehicle door when the encryption algorithm of the unlocking key is the same as the preset encryption algorithm.

[0126] In another possible implementation, the target vehicle may further include:

[0127] The calculation module 820 may also be used to generate a reminder message according to the voltage of the digital car key when the voltage of the digital car key is lower than a second preset value;

[0128] The control module 830 may also be used to present reminder information in response to the user entering the vehicle.

[0129] In another possible implementation, the target vehicle may further include: a wireless charging module 840;

[0130] The wireless charging module 840 is coupled to the control module 830 , and can be used to charge the digital car key in response to the digital car key establishing a wireless connection with the wireless charging module 840 .

[0131] See also Fig.10 , is a schematic diagram of another digital car key provided in an embodiment of the present application, the device may include:

[0132] Processor 910, memory 920 and I / O interface 930. The processor 910, memory 920 and I / O interface 930 can be connected to each other in a communicative manner. The memory 920 is used to store instructions, and the processor 910 is used to execute the instructions stored in the memory 920 to implement the following. Figure 3 The corresponding steps performed by the described digital car key.

[0133] The processor 910 is used to execute the instructions stored in the memory 920 to control the I / O interface 930 to receive and send signals and complete the steps in the above method. The memory 920 can be integrated in the processor 910 or set separately from the processor 910.

[0134] The memory 920 may also include a storage system 921, a cache 922, and a RAM 923. The cache 922 is a primary memory between the RAM 923 and the CPU, which is composed of a static memory chip (SRAM). It has a relatively small capacity but a much higher speed than the main memory, close to the speed of the CPU; the RAM 923 is an internal memory that directly exchanges data with the CPU, which can be read and written at any time (except when refreshed), and has a very high speed. It is usually used as a temporary data storage medium for the operating system or other running programs. The three are combined to realize the functions of the memory 920.

[0135] As an implementation, the function of the I / O interface 930 may be implemented by a transceiver circuit or a dedicated transceiver chip. The processor 910 may be implemented by a dedicated processing chip, a processing circuit, a processor or a general-purpose chip.

[0136] As another implementation method, it is possible to use a general-purpose computer to implement the device provided in the embodiment of the present application. That is, the program code that implements the functions of the processor 910 and the I / O interface 930 is stored in the memory 920, and the general-purpose processor implements the functions of the processor 910 and the I / O interface 930 by executing the code in the memory 920.

[0137] For the concepts, explanations, detailed descriptions and other steps involved in the device and related to the technical solutions provided in the embodiments of the present application, please refer to the description of the method steps performed by the device in the aforementioned method or other embodiments, which will not be repeated here.

[0138] As another implementation of this embodiment, a computer-readable storage medium is provided, on which instructions are stored. When the instructions are executed, the method in the above method embodiment is executed.

[0139] As another implementation of this embodiment, a computer program product including instructions is provided, and when the instructions are executed, the method in the above method embodiment is performed.

[0140] Those skilled in the art will appreciate that for ease of description, Fig.10 Only one memory and processor are shown. In an actual terminal or server, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiments of the present application.

[0141] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.

[0142] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM).

[0143] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor.

[0144] It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0145] In addition to the data bus, the bus may also include a power bus, a control bus, a status signal bus, etc. However, for the sake of clarity, various buses are marked as buses in the figure.

[0146] It should also be understood that the first, second, third, fourth and various numerical numbers involved in this document are only distinctions made for the convenience of description and are not intended to limit the scope of the present application.

[0147] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0148] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0149] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0150] Those skilled in the art will appreciate that the various illustrative logical blocks (ILBs) and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0151] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0152] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0154] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0155] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. The computer program is executed by a processor to implement part or all of the steps of any distance estimation method recorded in the above method embodiments.

[0156] An embodiment of the present application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute part or all of the steps of any distance estimation method recorded in the above method embodiments.

[0157] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A digital car key, characterized in that: The digital car key includes a power supply module, a sensor and a first wireless communication module; The power supply module is coupled to the sensor and the first wireless communication module, and is used to provide power to the digital car key; The sensor is coupled to the first wireless communication module, and is used to collect movement data of the digital car key and send the movement data to the first wireless communication module, wherein the movement data includes movement speed and movement direction; The first wireless communication module is used to scan the first wireless broadcast signal emitted by the target vehicle and pair with the target vehicle to send movement data to the target vehicle and thereby determine the current distance between the digital car key and the target vehicle; wherein the distance between the digital car key and the target vehicle is determined based on the moving direction, the moving speed and the signal strength of the current pairing connection between the first wireless communication module and the target vehicle.

2. The digital car key according to claim 1, characterized in that: The first wireless communication module includes a first Bluetooth module and a first positioning module. When the distance between the digital car key and the target vehicle is within a first preset range, the first Bluetooth module sends a pairing signal to pair with the target vehicle; when the distance between the digital car key and the target vehicle is within a second preset range, the first positioning module sends a pairing signal to pair with the target vehicle to transmit a positioning signal. The first preset range is larger than the second preset range.

3. The digital car key according to claim 2, characterized in that: The sensor is a six-axis gyroscope.

4. The digital car key according to claim 3, characterized in that: The six-axis gyroscope includes an acquisition chip, a first resistor and a first capacitor, and the acquisition chip includes a first data output pin, a second data output pin, an operating voltage input / output pin, a programming / erase voltage pin, a pull-down interrupt pin, a first empty pin, a clock pin, a second empty pin, a current sampling pin, a ground pin, a third empty pin and an operating voltage pin; The first data output pin, the second data output pin, the clock pin and the current sampling pin of the acquisition chip are used to be connected to the first Bluetooth module; The programming / erasing voltage pin of the acquisition chip is grounded, and the pull-down interrupt pin is coupled to the working voltage pin via a first resistor; The working voltage input / output pin of the acquisition chip is coupled to the working voltage pin, the working voltage pin is grounded via the first capacitor, and the working voltage pin is coupled to the low voltage difference linear regulator to receive the stable voltage transmitted by the low voltage difference linear regulator; The pull-down interrupt pin of the acquisition chip is connected to the input end of the first Bluetooth module.

5. The digital car key according to claim 4, characterized in that: The digital car key further includes: a voltage detection unit and a first wireless charging module; The two ends of the voltage detection unit are respectively coupled to the power supply module and the first Bluetooth module, and are used to collect voltage data of the power supply module at a first preset frequency after receiving the detection indication signal sent by the first wireless communication module; The first wireless charging module is coupled to the power supply module and is used to charge the power supply module.

6. The digital car key according to claim 5, characterized in that: The first wireless charging module includes a charging control unit, a wireless charging coil and a coil management chip; Two ends of the charging control unit are respectively coupled to the power supply module and the coil management chip, and are used to send an indication signal to the first wireless communication module, and the indication signal is used to transmit the status information of the power supply module to the first Bluetooth module; The wireless charging coil is coupled to the coil management chip, and is used to receive electromagnetic energy sent by the second wireless charging module of the target vehicle and convert the electromagnetic energy into electrical energy; The coil management chip is used to monitor the working state of the wireless charging coil and convert the electric energy converted by the wireless charging coil into a stable output voltage, and the stable output voltage flows to the power supply module via the charging control unit.

7. The digital car key according to claim 6, characterized in that: The digital car key also includes: a data encryption module and a low-dropout linear regulator; The data encryption module is coupled to the low voltage dropout linear regulator and is used to obtain a stable voltage via the low voltage dropout linear regulator; The low voltage difference linear regulator is coupled to the power supply module, the first wireless communication module and the six-axis gyroscope, and is used to convert the unstable voltage output by the power supply module into a stable voltage, and transmit the stable voltage to the data encryption module, the first wireless communication module and the six-axis gyroscope.

8. The digital car key according to claim 7, characterized in that: The data encryption module includes an encryption chip and an encryption switch circuit; The encryption switch circuit is used to conduct the circuit between the encryption chip and the low-dropout linear regulator to put the encryption chip into working state when the second wireless broadcast signal sent by the target vehicle contains an unlock instruction signal; The encryption chip is coupled to the encryption switch circuit and the first wireless communication module, and is used to store an unlocking key and send the unlocking key to the first wireless communication module. The unlocking key is used to instruct the target vehicle to open a door.

9. The digital car key according to claim 8, characterized in that: The digital car key also includes: a button and a lamp; The lamp is coupled to the button and the first Bluetooth module, and is used to flash when the user presses and / or clicks the button; based on the control instructions of the first Bluetooth module, it is used to flash when the digital car key is charging, and is used to flash when the voltage of the digital car key is lower than a preset threshold.

10. A vehicle-mounted communication system, characterized in that: include: The digital car key according to any one of claims 1 to 9; A target vehicle is communicatively connected to the digital vehicle key.

11. A vehicle-mounted communication method, characterized in that: The method is applied to the vehicle communication system according to claim 10, and the method comprises: Collecting movement data of the digital car key through a sensor of the digital car key, wherein the movement data includes movement speed and movement direction; Wirelessly pairing and connecting with a target vehicle through a first wireless communication module of the digital car key, and sending the mobile data to the target vehicle through the first wireless communication module; The target vehicle determines the current distance between the digital vehicle key and the target vehicle according to the moving direction, the moving speed, and the signal strength of the paired connection between the first wireless communication module and the target vehicle.

12. The method according to claim 11, characterized in that The determining the current distance between the digital vehicle key and the target vehicle according to the moving direction, the moving speed, and the signal strength of the paired connection between the first wireless communication module and the target vehicle by the target vehicle includes: Obtaining, by the target vehicle, a first estimated distance value between the digital car key and the vehicle according to the signal strength of the digital car key at a first position, wherein the first position is an initial position where the digital car key scans a first wireless broadcast signal and achieves pairing with the target vehicle; obtaining a motion trajectory of the digital car key from the first position to the second position according to the moving direction and the moving speed by the target vehicle, and determining a displacement value of the digital car key from the first position to the second position based on the motion trajectory, wherein the second position is a current position of the digital car key; Obtaining, by the target vehicle, a second estimated distance value between the digital car key and the target vehicle when the digital car key is at the second position according to the signal strength of the digital car key at the second position; determining an obstacle parameter by the target vehicle according to the displacement value, the first estimated distance value, and the second estimated distance value; the obstacle parameter is used to indicate the degree of signal obstruction when the digital car key is paired with the target vehicle; The current distance between the digital vehicle key and the target vehicle is determined by the target vehicle based on the second estimated distance value and the obstacle parameter.

13. The method according to claim 12, characterized in that The current distance between the digital vehicle key and the target vehicle is determined by the target vehicle based on the second estimated distance value and the obstacle parameter, satisfying the following formula: y=L×a y is the current distance between the digital car key and the target vehicle; L is the second estimated distance value; a is the obstacle parameter.

14. The method according to claim 13, characterized in that Determining obstacle parameters by the target vehicle according to the displacement value, the first estimated distance value, and the second estimated distance value; S is the first estimated distance value, and D is the displacement value.

15. The method according to any one of claims 12 to 14, characterized in that: The method further comprises: When the current distance between the digital vehicle key and the target vehicle is less than a predetermined value, sending an unlocking key to the target vehicle via the digital vehicle key; The unlock key is received by the target vehicle and a door of the target vehicle closest to the digital vehicle key is unlocked.

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