CN109466506B

CN109466506B - Vehicle keyless control system and method based on multiple Bluetooth signal strengths

Info

Publication number: CN109466506B
Application number: CN201811091383.2A
Authority: CN
Inventors: 刘威亚; 王庆; 陈义贤; 汪东红; 吴志波; 刘恒健; 王国强; 谭文; 赵元波; 胡谨锋; 林平
Original assignee: Yuanfeng Technology Co Ltd
Current assignee: Yuanfeng Technology Co Ltd
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2021-06-22
Anticipated expiration: 2038-09-18
Also published as: CN109466506A

Abstract

The invention discloses a vehicle keyless control system based on multiple Bluetooth received signal strengths, which comprises a main Bluetooth module arranged in a vehicle and a plurality of slave Bluetooth modules arranged on different sides outside the vehicle and respectively electrically connected with the main Bluetooth module, wherein the main Bluetooth module acquires signals sent by a calibrated virtual key to obtain main received signal strength, each slave Bluetooth module acquires signals sent by the virtual key to obtain slave received signal strength of a corresponding side, the orientation and the distance of the virtual key relative to the vehicle are judged according to the main received signal strength, the slave received signal strength of the corresponding side, the main received signal strength and the slave received signal strength of the corresponding side, and a corresponding control command is sent to a vehicle control system according to the judgment result. The invention can judge that the virtual key is arranged on a certain side of the vehicle or in the vehicle, and generates different control commands according to the specific direction of the virtual key, thereby having accurate control and high safety. The invention also discloses a corresponding vehicle keyless control method.

Description

Vehicle keyless control system and method based on multiple Bluetooth signal strengths

Technical Field

The invention relates to an automobile automatic control technology, in particular to a vehicle keyless control based on multiple Bluetooth receiving signal strengths.

Background

In the conventional art, a user must carry a conventional key at all times to have authority to use a vehicle. With the development of mobile phone technology, people have higher and higher dependence on mobile phones. Those skilled in the art have tried to implement all the functions of the conventional key as long as the user carries the mobile phone, which is a breakthrough point for the innovation of the automobile industry. The existing hardware platform of the mobile phone can be used for the functions of ranging and positioning, and is only BLE (Bluetooth technology) and GPS. The positioning accuracy of the GPS is about 10-20 m, and the safety requirement of a PEPS system is not met. Therefore, in the prior art, a bluetooth technology is tried to control a vehicle by using a mobile phone, so that a user does not need to carry a vehicle key, however, BLE adopts electromagnetic wave propagation with a frequency of 2.4GHZ, the wavelength of BLE is one ten thousandth of a frequency of 125KHZ, and the shorter the wavelength, the weaker the penetration capability, the more easily the BLE the mobile phone is, so that the existing vehicle keyless control system cannot accurately distinguish the distance and the position of the mobile phone from the vehicle, misoperation is easily caused, and the safety during control cannot be guaranteed.

Therefore, a vehicle keyless control system and method with accurate control and strong safety is urgently needed.

Disclosure of Invention

The invention aims to provide a vehicle keyless control system and method with accurate control and strong safety.

In order to realize the aim, the invention discloses a vehicle keyless control system based on multi-Bluetooth received signal strength, which comprises a main Bluetooth module arranged in a vehicle and a plurality of slave Bluetooth modules arranged on different sides outside the vehicle and respectively electrically connected with the main Bluetooth module, in the working mode, the master Bluetooth module collects signals sent by a calibrated virtual key to obtain master received signal strength, each slave Bluetooth module collects signals sent by the virtual key to obtain slave received signal strength of a corresponding side and transmits the slave received signal strength to the master Bluetooth module, the master Bluetooth module judges the orientation and the distance of the virtual key relative to the vehicle according to the master received signal strength, the slave received signal strength of the corresponding side, the master received signal strength and the magnitude relation between the slave received signal strengths of the corresponding sides, and sends a corresponding control command to a vehicle control system according to the judgment result; in the working mode, the main Bluetooth module sends a specific message to the virtual key, receives the specific message forwarded by the virtual key in response, calculates the distance d between the virtual key and the vehicle by measuring the arrival time of the specific message, and corrects the distance d1 according to the distance d.

Compared with the prior art, the method has the advantages that the slave Bluetooth modules are arranged on different sides outside the vehicle to respectively acquire the slave Received Signal Strength of the corresponding side, the corresponding Received Signal Strength (RSSI for short) acquired by the master Bluetooth module and the slave Bluetooth module of the corresponding side is compared, and the virtual key is judged to be positioned on one side of the vehicle or in the vehicle by comparing the magnitude relation between the master Received Signal Strength and the slave Received Signal Strength of the corresponding side, so that different control commands can be generated according to the specific direction of the virtual key, accurate control is realized, misoperation is avoided, and the use safety of a user is improved.

Preferably, the slave bluetooth module comprises a left bluetooth module installed on the left side of the vehicle, a right bluetooth module installed on the right side of the vehicle, and a rear bluetooth module installed on the rear side of the vehicle.

Specifically, left side bluetooth module and right bluetooth module install respectively in handlebar department, outer footboard department, car pillar department or outside rear-view mirror department, back bluetooth module install in outer bumper department of the rear of a vehicle or trunk button department, main bluetooth module installs in handrail case department in the car.

Preferably, the master bluetooth module determines whether the virtual key is located within a first preset distance of the corresponding side of the vehicle according to a magnitude relationship between the slave received signal strength of the side where the virtual key is located and a preset boundary strength of the side where the virtual key is located, and if so, sends a corresponding control command to the vehicle control system.

Specifically, in the initial mode, each slave bluetooth module acquires a signal sent by a virtual key calibrated in a first preset distance of the corresponding side within a preset time and acquires the received signal strength of the signal, so as to acquire the boundary strength of the corresponding side and transmit the boundary strength to the master bluetooth module for storage. According to the invention, in an initial mode, the virtual key is directly arranged at a first preset distance from the Bluetooth module to the corresponding side for acquiring the received signal strength, so that the corresponding boundary strength is generated, the influence of different Bluetooth modules and different virtual keys (electronic equipment loaded with the virtual key) on the received signal strength is reduced, the detection result is more accurate, and misoperation is difficult.

Specifically, the master bluetooth module judges that the virtual key is located within a first preset distance on the left side of the vehicle when the left received signal strength is greater than the right received signal strength, the rear received signal strength and the master received signal strength and is greater than the left limit strength; the main Bluetooth module judges that the virtual key is positioned in a first preset distance on the right side of the vehicle when the right received signal strength is greater than the left received signal strength, the rear received signal strength and the main received signal strength and is greater than the right limit strength; and the main Bluetooth module judges that the virtual key is positioned in a first preset distance at the rear side of the vehicle when the rear received signal strength is greater than the left received signal strength, the right received signal strength and the main received signal strength and is greater than the rear limit strength.

Preferably, the master bluetooth module determines that the virtual key is located at the side where the strongest slave received signal strength is located when the slave received signal strength of one side is greater than the slave received signal strengths of other sides and the master received signal strength, and determines that the virtual key is located in the vehicle when the master received signal strength is greater than each slave received signal strength.

Preferably, the master bluetooth module sends a corresponding access permission command to a vehicle control system within a first preset distance of the virtual key at the corresponding side of the vehicle to allow the corresponding vehicle door or trunk to be opened; the master Bluetooth module issues a start allowing command to the vehicle control system to allow the vehicle to start when the virtual key is in the vehicle. According to the scheme, the corresponding door or trunk is controlled to be opened according to the position of the virtual key, so that accurate control is realized.

Preferably, in the operating mode, the master bluetooth module determines that the virtual key is in the keyless entry zone when the virtual key is within a first preset distance of the slave bluetooth module on the corresponding side of the vehicle or in the vehicle, when the virtual key is between a second preset distance of the vehicle and the keyless entry zone, judging that the virtual key is in the instruction sending zone, when the virtual key is positioned between a third preset distance of the vehicle and the instruction sending area, the virtual key is judged to be positioned in the signal connecting area, determining that the virtual key is in a sleep zone when the virtual key is outside a third preset distance of the vehicle, the master Bluetooth module and the slave Bluetooth module carry out corresponding working modes according to the area where the virtual key is located, the second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance.

Specifically, the working modes include a sleep mode, a connection mode and a control mode, and the master bluetooth module controls itself and the slave bluetooth module to enter the corresponding working modes according to the area where the virtual key is located: the main Bluetooth module enters a sleep mode when the virtual key is in a sleep zone: the master Bluetooth module is in a dormant state and is used for waking up and sending a broadcast message at regular time so as to receive a signal sent by the virtual key, and the slave Bluetooth module is in the dormant state; the main Bluetooth module enters a connection mode when the virtual key is in a signal connection zone: the master Bluetooth module is connected with the virtual key, and the slave Bluetooth module is in a dormant state; the main Bluetooth module enters a control mode when the virtual key is in an instruction sending area and a keyless entry area: the master Bluetooth module and the slave Bluetooth module are respectively connected with the virtual key.

Preferably, the master bluetooth module is in communication with the vehicle control system and the slave control module through a communication network, and when the virtual key is in a dormant area and a signal connection area, the master bluetooth module controls the communication network to be in a dormant state, wakes up the communication network when receiving a vehicle control instruction or a wake-up command sent by the virtual key, and controls the communication network to be in the dormant state when the virtual key enters an instruction sending area and a keyless entry area for a preset time and does not receive the vehicle control instruction or the wake-up command sent by the virtual key.

Preferably, the master bluetooth module communicates with the vehicle control system and the slave control module through a communication network, the slave bluetooth module is further provided with a wake-up switch, the wake-up switch outputs a wake-up command, the slave bluetooth module wakes up the communication network according to the wake-up command and outputs the wake-up command to the master bluetooth module, and the master bluetooth module exits from a sleep state according to the wake-up command.

Preferably, the master bluetooth module enters an initial mode at the time of initial use or upon an initial command: the master Bluetooth module receives a calibration signal sent by electronic equipment with a virtual key and establishes a calibration relation between a vehicle and the virtual key according to the calibration signal, and each slave Bluetooth module acquires a signal sent by the virtual key calibrated within a preset time at a first preset distance of a corresponding side and acquires the received signal intensity of the signal so as to acquire the boundary intensity of the corresponding side and transmit the boundary intensity to the master Bluetooth module for storage.

Specifically, the main bluetooth module stores virtual key information corresponding to a vehicle type and the calibration parameters corresponding to virtual key types, searches for electronic equipment with virtual keys around in an initial mode, receives calibration signals sent by the virtual keys, identifies the virtual key types according to the calibration signals and the virtual key information, obtains the calibration parameters corresponding to the virtual keys, and establishes a calibration relationship between the vehicle and the virtual keys according to the calibration signals and the calibration parameters.

Preferably, the electronic device with the virtual key is a mobile terminal, a watch or an electronic bracelet.

Preferably, the master bluetooth module further determines a distance d1 between the virtual key and the vehicle according to the strength of the slave received signal, the strength of the master received signal, and the strength of the corresponding side boundary, and in the operating mode, the master bluetooth module sends a specific message to the virtual key and records a sending time, and receives specific message information forwarded by the virtual key and records an accepting time, where the specific message information includes the specific message, a specific message receiving time of the virtual key, and a specific message sending time of the virtual key, the master bluetooth module further calculates a distance d between the virtual key and the vehicle according to the measured arrival time, corrects the distance d1 according to the distance d, where the distance d is c x (Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of the electromagnetic wave in the air, and Ttxb is the specific message sending time of the master bluetooth module, trxb is the time when the main Bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message. Although one master bluetooth module and a plurality of slave bluetooth modules have strong interference resistance on distinguishing the inside and outside of the vehicle, the specific received signal strength value is still relied on the outside positioning of the vehicle. The different states of the electronic equipment where the user holds the virtual key or the shielding of any liquid or metal barrier can attenuate the intensity of the received signal, and the intensity of the received signal is extremely easy to be amplified by the repeater, so that the safety of the user in using the vehicle is influenced (the user is far away from the vehicle and the intensity of the received signal is in an area where the vehicle door can be opened or started after being amplified by the repeater, and the vehicle door can be opened).

Specifically, the master bluetooth module further sends an alarm signal to the virtual key to warn the user when the error between the distance d and the distance d1 is greater than a predetermined value.

The invention also discloses a vehicle keyless control method based on the multi-Bluetooth received signal intensity, wherein a main Bluetooth module is arranged in the vehicle, and a plurality of slave Bluetooth modules electrically connected with the main Bluetooth module are respectively arranged at different sides outside the vehicle; the method comprises the following steps: (1) acquiring signals sent by the calibrated virtual keys through the master Bluetooth module to obtain master received signal strength, and acquiring signals sent by the calibrated virtual keys through each slave Bluetooth module to obtain slave received signal strength of the corresponding side; (2) judging the direction and the distance of the virtual key relative to the vehicle according to the main received signal strength, the slave received signal strength of the corresponding side, the main received signal strength and the slave received signal strength of the corresponding side, and sending a corresponding control command to a vehicle control system according to a judgment result; in the working mode, a specific message is sent to the virtual key through the main Bluetooth module, the specific message forwarded by the virtual key in response is received, the distance d between the virtual key and the vehicle is calculated by measuring the arrival time of the specific message, and the distance d1 is corrected according to the distance d.

Compared with the prior art, the auxiliary Bluetooth modules are arranged on different sides outside the vehicle to respectively acquire the corresponding side auxiliary receiving signal strength, the corresponding side auxiliary receiving signal strength is acquired by comparing the main Bluetooth module with the corresponding side auxiliary Bluetooth module, and the virtual key is judged to be positioned on a certain side of the vehicle or in the vehicle by comparing the magnitude relation between the main receiving signal strength and the corresponding side auxiliary receiving signal strength, so that different control commands can be generated according to the specific direction of the virtual key, accurate control is performed, misoperation is avoided, and the use safety of a user is improved.

Preferably, in the step (2), whether the virtual key is located within a first preset distance of the corresponding side of the vehicle is determined according to a magnitude relationship between the received signal strength of the side where the virtual key is located and a preset limit strength of the side where the virtual key is located, and if so, a corresponding control command is sent to a vehicle control system.

Specifically, before the step (1), the method further includes entering an initial mode according to an initial command when the bluetooth module is used for the first time or when the initial command is received, acquiring, in the initial mode, a signal sent by a virtual key calibrated within a first preset distance from the corresponding side through each slave bluetooth module to obtain and store the boundary strength of the corresponding side, and the steps (1) and (2) are performed in the working mode. According to the invention, in an initial mode, the virtual key is directly arranged at a first preset distance from the Bluetooth module to the corresponding side for acquiring the received signal strength, so that the corresponding boundary strength is generated, the influence of different Bluetooth modules and different virtual keys (electronic equipment loaded with the virtual key) on the received signal strength is reduced, the detection result is more accurate, and misoperation is difficult.

Preferably, in the step (2), when the slave received signal strength of one side is greater than the slave received signal strength and the master received signal strength of the other sides, it is determined that the virtual key is located at the side where the strongest slave received signal strength is located, and when the master received signal strength is greater than each slave received signal strength, it is determined that the virtual key is located in the vehicle.

Preferably, the step of issuing a corresponding control command to the vehicle control system specifically includes: sending a corresponding access permission command to a vehicle control system within a first preset distance of the virtual key at the corresponding side of the vehicle to allow a corresponding vehicle door or a trunk to be opened; and issuing a start permission command to the vehicle control system to allow the vehicle to start when the virtual key is in the vehicle.

Preferably, the step (2) further determines a location area of the virtual key according to a distance between the virtual key and the vehicle, and controls the operating modes of the master bluetooth module and the slave bluetooth module according to the location area of the virtual key, wherein a specific method for determining the location area of the virtual key according to the distance between the virtual key and the vehicle includes: the method comprises the steps of judging that a virtual key is located in a keyless entry area when the virtual key is located in a first preset distance of a corresponding side of a vehicle from a Bluetooth module or in the vehicle, judging that the virtual key is located in an instruction sending area when the virtual key is located between a second preset distance of the vehicle and the keyless entry area, judging that the virtual key is located in a signal connection area when the virtual key is located between a third preset distance of the vehicle and the instruction sending area, judging that the virtual key is located in a dormant area when the virtual key is located outside the third preset distance of the vehicle, wherein the second preset distance is larger than the first preset distance, and the third preset distance is larger than the second preset distance.

Specifically, the step of controlling the working modes of the master bluetooth module and the slave bluetooth module according to the area where the virtual key is located specifically includes: entering a sleep mode when the virtual key is in a sleep zone: the master Bluetooth module is in a dormant state and is awakened to send a broadcast message at regular time, the intensity of a received signal sent by a virtual key is collected when a signal sent by the virtual key is received so as to judge the area where the virtual key is located, and the slave Bluetooth module is in the dormant state; entering a connection mode when the virtual key is in a signal connection zone: the master Bluetooth module is connected with the virtual key and acquires the received signal strength of the virtual key to judge the area of the virtual key, and the slave Bluetooth module is in a dormant state; entering a control mode when the virtual key is in a command sending zone and a keyless entry zone: the master Bluetooth module and the slave Bluetooth module are respectively connected with the virtual key.

Preferably, the master bluetooth module communicates with the vehicle control system and the slave control module through communication networks, respectively, and step (2) further includes: when the virtual key is in a dormant area and a signal connection area, controlling the communication network to be in a dormant state, awakening the communication network when receiving a vehicle control instruction or an awakening command sent by the virtual key, and controlling the communication network to be in the dormant state when the virtual key enters a command sending area and a keyless entry area for preset time and does not receive the vehicle control instruction or the awakening command sent by the virtual key.

Preferably, the master bluetooth module communicates with the vehicle control system and the slave control module through a communication network, respectively, and further includes the steps of: and a wake-up switch for outputting a wake-up command is arranged on the slave Bluetooth module, and the communication network, the master Bluetooth module and the slave Bluetooth module are awakened according to the wake-up command when the wake-up command is received.

Preferably, before the step (1), the method further comprises the steps of: the method comprises the steps that when the vehicle is used for the first time or an initial command is received, the vehicle enters an initial mode according to the initial command, in the initial mode, a calibration signal sent by electronic equipment with a virtual key is received through a main Bluetooth module, a calibration relation is established between the vehicle and the virtual key according to the calibration signal, and the steps (1) and (2) are executed in a working mode.

Specifically, virtual key information corresponding to a vehicle type and the calibration parameters corresponding to the virtual key type are stored in advance, electronic equipment with a virtual key around is searched in an initial mode, a calibration signal sent by the virtual key is received, the virtual key type is identified according to the calibration signal and the virtual key information, the calibration parameters corresponding to the virtual key are obtained, and a calibration relation is established between the vehicle and the virtual key according to the calibration signal and the calibration parameters.

Preferably, the step (1) further comprises: sending a specific message to the virtual key through the main Bluetooth module and recording sending time, receiving specific message information forwarded by the virtual key through the main Bluetooth module and recording receiving time, wherein the specific message information comprises the specific message, the time for the virtual key to receive the specific message and the time for the virtual key to send the specific message, and the step (2) further comprises the following steps: and judging the distance d1 between the virtual key and the vehicle according to the strength of the slave received signal, the strength of the master received signal and the strength of the corresponding side limit, calculating the distance d between the virtual key and the vehicle according to the measured arrival time, and correcting the distance d1 according to the distance d, wherein the distance d is c (Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of electromagnetic waves in the air, Ttxb is the time when the master Bluetooth module sends the specific message, Trxb is the time when the master Bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message. Although one master bluetooth module and a plurality of slave bluetooth modules have strong interference resistance on distinguishing the inside and outside of the vehicle, the specific received signal strength value is still relied on the outside positioning of the vehicle. The different states of the electronic equipment where the user holds the virtual key or the shielding of any liquid or metal barrier can attenuate the intensity of the received signal, and the intensity of the received signal is extremely easy to be amplified by the repeater, so that the safety of the user in using the vehicle is influenced (the user is far away from the vehicle and the intensity of the received signal is in an area where the vehicle door can be opened or started after being amplified by the repeater, and the vehicle door can be opened).

Specifically, in the step (2), it is further determined whether a difference between the distance d and the distance d1 is greater than a predetermined value, and if so, an alarm signal is sent to the virtual key through the master bluetooth module to warn a user.

The invention also discloses electronic equipment which comprises a main Bluetooth module arranged in the automobile and a plurality of auxiliary Bluetooth modules which are arranged on different sides outside the automobile and are respectively and electrically connected with the main Bluetooth module; one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the multiple bluetooth received signal strength based vehicle keyless control method as described above.

The invention also discloses a computer readable storage medium, which comprises a computer program used in combination with a master bluetooth module installed in a vehicle and a plurality of slave bluetooth modules installed at different sides outside the vehicle and respectively electrically connected with the master bluetooth module, wherein the computer program can be executed by a processor to realize the vehicle keyless control method based on the multiple bluetooth received signal strength.

Drawings

Fig. 1 is a block diagram showing the configuration of a keyless control system for a vehicle according to the present invention.

Fig. 2 is a schematic view of the vehicle keyless control system of the present invention mounted on a vehicle.

FIG. 3 is a schematic view of the present invention at a first predetermined distance from a corresponding side of the vehicle.

Fig. 4 is a schematic view of the area around the vehicle of the present invention.

Fig. 5 is a schematic diagram of the switching of the working modes of the vehicle keyless control system according to the invention.

Fig. 6 is a flowchart of a vehicle keyless control method according to the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 and 2, the invention discloses a vehicle keyless control system 100 based on multiple bluetooth received signal strengths, which comprises a master bluetooth module 10 installed inside a vehicle 200 and a plurality of slave bluetooth modules 20 installed on different sides outside the vehicle 200 and respectively electrically connected with the master bluetooth module 10. The slave bluetooth module 20 is a directional antenna facing the corresponding side, and the master bluetooth module 10 is an omnidirectional antenna.

In the operating mode, the main bluetooth module 10 collects a signal sent by the calibrated virtual key 30, and obtains a Received Signal Strength (RSSI) of the signal according to the signal, which is referred to as a main received signal strength. Each of the slave bluetooth modules 20 collects a signal sent by the virtual key 30, obtains a Received Signal Strength (RSSI) of the signal according to the signal, and sends the RSSI to the master bluetooth module 10, and the master bluetooth module 10 determines an orientation and a distance (including one of an inside and an outside of the vehicle) of the virtual key relative to the vehicle according to the magnitude relationship between the master signal strength, the slave signal strength of the corresponding side, the master signal strength, and the slave signal strength of the corresponding side, and sends a corresponding control command to the vehicle control system 300 according to the determination result.

Referring to fig. 1 and 2, in the present embodiment, the master bluetooth module 10 is installed at a point a in the vehicle 200, and the slave bluetooth module 20 includes a left slave bluetooth module 21 installed at a point B on the left outer side of the vehicle 200, a right slave bluetooth module 22 installed at a point C on the right outer side of the vehicle 200, and a rear slave bluetooth module 23 installed at a point D on the rear outer side of the vehicle 200. Of course, the slave bluetooth module 20 may also include only the left bluetooth module 21 and the right bluetooth module 22, or the left bluetooth module 21 and the rear bluetooth module 23, etc. in combination, as long as at least two slave bluetooth modules 20 in at least two directions are included. The slave bluetooth module 20 may further include a front bluetooth module (not shown) provided in front of the vehicle 200. The corresponding side of the vehicle may be installed in one slave bluetooth module 20, or may be installed in a plurality of slave bluetooth modules 20, and the slave received signal strength of the corresponding side at this time takes the intermediate value of the plurality of slave bluetooth modules 20, or is calculated by other calculation methods.

Specifically, in the present embodiment, the left bluetooth module 21 and the right bluetooth module 22 are respectively installed at the handle of the corresponding side of the vehicle 200, and the rear bluetooth module 23 is installed at the bumper outside the vehicle tail. The main Bluetooth module 10 is installed at an armrest box in the vehicle. Of course, the left bluetooth module 21 and the right bluetooth module 22 may also be installed at the external foot pedal, the pillar (pillar B) or the external rearview mirror, and if the left bluetooth module 21 and the right bluetooth module 22 are installed at the pillar (pillar B), a metal plate is added between the bluetooth module 20 and the pillar to reduce the radiation intensity of the inside of the vehicle from the bluetooth module 20 at the position, and it should be noted that there is no metal medium shielding outside the antennas of the left bluetooth module 21 and the right bluetooth module 22. Of course, the rear bluetooth module 23 may also be mounted at the trunk button or the like. The master bluetooth module 10 may also be mounted in other locations in the vehicle.

Referring to fig. 1, in the operating mode, the master bluetooth module 10 collects signals sent by the calibrated virtual key 30 to obtain a master received signal strength M, the left bluetooth module 21 collects signals sent by the calibrated virtual key 30 to obtain a left received signal strength S1 and transmits the left received signal strength S1 to the master bluetooth module 10, the right bluetooth module 22 collects signals sent by the virtual key 30 to obtain a right received signal strength S2 and transmits the right received signal strength S2 to the master bluetooth module 10, the rear bluetooth module 23 collects signals sent by the virtual key 30 to obtain a rear-side received signal strength S3, the master bluetooth module 10 determines the distance of the virtual key 30 with respect to the vehicle 200 according to the strengths of the master received signal strength M, the left received signal strength S1, the right received signal strength S2 and the rear-side received signal strength S3, the position of the virtual key 30 relative to the vehicle 200 is determined according to the magnitude relationship among the main received signal strength M, the left received signal strength S1, the right received signal strength S2, and the rear received signal strength S3, and a corresponding control command is issued to the vehicle control system according to the position and distance of the virtual key 30 relative to the vehicle 200.

Specifically, the orientation of the virtual key 30 with respect to the vehicle 200 may be determined first, and then the distance between the virtual key 300 and the vehicle 200 may be determined. The position of the maximum value among the main received signal strength M, the left received signal strength S1, the right received signal strength S2, and the rear received signal strength S3 corresponds to the position of the virtual key 30 relative to the vehicle 200, for example, when S1> max (S2, S3, M), it is determined that the virtual key 30 is located on the left side of the vehicle 200, and then it is determined whether S1 is greater than a preset left limit strength L, and if so, it is determined that the virtual key 30 is located within a first preset distance, that is, in a region Q1 in fig. 3. When S2> max (S1, S3, M), it is determined that the virtual key 30 is located on the right side of the vehicle 200, and then it is determined whether S2 is greater than the preset right limit strength R, and if so, it is determined that the virtual key 30 is located within the first preset distance, i.e., in the Q2 area in fig. 3. When S3> max (S1, S2, M), it is determined that the virtual signal is located at the rear side of the vehicle 200, and then it is determined whether S3 is greater than the preset rear limit intensity H, and if so, it is determined that the virtual key 30 is located within the first preset distance, i.e., in the region Q3 in fig. 3. When M > max (S1, S2, S3), the virtual key 30 is located in the vehicle 200, that is, the virtual key 30 is located in the Q4 region.

Wherein the master bluetooth module 10 issues a left door admission command to the vehicle control system 300 to allow the left side door to be opened when the virtual key 30 is in the Q1 area. The master bluetooth module 10 issues a right door admission command to the vehicle control system 300 to allow the right vehicle door to be opened when the virtual key 30 is in the Q2 area. The master bluetooth module 10 issues a rear door admission command to the vehicle control system 300 to allow the opening of a rear side door or trunk when the virtual key 30 is in the Q3 area. The master bluetooth module 10 issues a start permission command to the vehicle control system 300 to allow the vehicle 200 to start when the virtual key 30 is in the Q4 area.

Preferably, in the initial mode, each slave bluetooth module 20 collects a signal sent by the virtual key 30 calibrated within a preset time at a first preset distance from the corresponding side and obtains the received signal strength of the signal, so as to obtain the boundary strength of the corresponding side and transmit the boundary strength to the master bluetooth module 10 for storage. In operation, the vehicle keyless control system 100 based on multiple bluetooth received signal strength enters an initial mode during initial use or upon an initial command, which may be triggered by a corresponding key on the vehicle 200 or transmitted by the virtual key 30. After entering the initial mode and establishing calibration between the vehicle keyless control system 100 based on multiple bluetooth received signal strengths and the virtual key 30, the virtual key 30 may be instructed to move to a side corresponding to the vehicle 200 (the user station is on the side corresponding to the vehicle 200), at this time, the distance between the virtual key 30 and the vehicle 200 may be customized or determined according to the system instruction, for example, 1 meter, and then the left side collects a signal emitted by the virtual key 30 calibrated within a preset time from the bluetooth module 21 to obtain the Received Signal Strength (RSSI) of the signal, and after filtering processing, a statistical value is obtained as the limit strength L on the left side. The right boundary strength R and the rear boundary strength H are obtained in this order in the manner described above. Of course, the limit strength of the corresponding side may be stored in advance immediately before shipment.

Wherein, the master bluetooth module 10 enters an initial mode when it is used for the first time or according to an initial command: the master bluetooth module 10 receives a calibration signal from an electronic device 500 having a virtual key 30 and establishes a calibration relationship between the vehicle 200 and the virtual key 30 according to the calibration signal. The working mode is a default mode and is in the working mode unless the initial command is used for the first time or received. In the initial mode, the working mode can be entered according to an initial ending command or a working command.

Specifically, the main bluetooth module 10 stores therein virtual key information corresponding to a vehicle type and the calibration parameters corresponding to virtual key types, and the main bluetooth module 10 searches for the electronic device 500 having the virtual key around in an initial mode, receives a calibration signal sent by the virtual key, identifies the virtual key type according to the calibration signal and the virtual key information, obtains the calibration parameters corresponding to the virtual key, and establishes a calibration relationship between the vehicle 200 and the virtual key 30 according to the calibration signal and the calibration parameters.

Referring to fig. 4, in the normal operation mode, the vehicle surroundings and the vehicle interior are divided into four regions, the master bluetooth module 10 determines that the virtual key is in the keyless entry region R1 when the virtual key 30 is located within the first preset distance of the slave bluetooth module on the corresponding side of the vehicle 200 or within the vehicle, determines that the virtual key 30 is in the command transmission region R2 when the virtual key 30 is located between the second preset distance of the vehicle 200 and the keyless entry region R1, determines that the virtual key 30 is in the signal connection region R3 when the virtual key 30 is located between the third preset distance of the vehicle 200 and the command transmission region R2, determines that the virtual key 30 is in the sleep region R4 when the virtual key 30 is located outside the third preset distance of the vehicle 200, and the master bluetooth module 10 and the slave bluetooth module 20 perform the corresponding operation modes according to the region where the virtual key 30 is located, the second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance. When the virtual key 30 is in the sleep region R4, the master bluetooth module 10 issues an entry prohibition and start command to the vehicle control system 300 to prohibit the doors and the trunk from being opened and prohibit the vehicle 200 from being started.

Referring to fig. 5, the operation modes include a sleep mode P1, a connection mode P2 and a control mode P3, the master bluetooth module 10 controls itself and the slave bluetooth module 20 to enter the corresponding operation modes according to the zone where the virtual key 30 is located: the master bluetooth module 10 enters a sleep mode P1 when the virtual key 30 is in the sleep region R4: the master bluetooth module 10 is in a sleep state and periodically wakes up to send a broadcast message to receive a signal sent by the virtual key 30, and the slave bluetooth module 20 is in the sleep state; the master bluetooth module 10 enters a connected mode P2 when the virtual key 30 is in a signal connection region R3: the master bluetooth module 10 is connected with the virtual key 30, and the slave bluetooth module 20 is in a dormant state; the master bluetooth module 10 enters a control mode P3 when the virtual key 30 is in the command issuing zone R2 and the keyless entry zone R1: the master bluetooth module 10 and the slave bluetooth module 20 are respectively connected to the virtual key 30, so as to acquire signals sent by the virtual key 30 in real time and obtain the received signal strength of the signals.

With continued reference to fig. 5, the master bluetooth module 10 communicates with the slave control module 20 through a communication network (CAN/LIN network), and the master bluetooth module 10 controls the communication network to be in a dormant state when the virtual key 30 is in the dormant region R4 and the signal connection region R3, and wakes up the communication network when receiving a vehicle control command or a wake-up command sent by the virtual key 30, as shown from the working mode P5 to the working mode P3 (control mode) in fig. 5, and wakes up the communication network when receiving the vehicle control command or the wake-up command sent by the virtual key 30 when the system is in the working mode P5, so as to enable the system to enter the working mode P3. When the system is in the working mode P1 (sleep mode), the system wakes up the communication network and the master bluetooth module 10 to enter the working mode P2 (connected mode) when receiving the wake-up command sent by the virtual key 30, as shown in fig. 5 from the working mode P1 to the working mode P2. Referring to FIG. 5, the operation modes P4 to P2 (connection mode) are shown, when the system is in the operation mode P4, the system wakes up the communication network when receiving the wake-up command sent by the virtual key 30.

With reference to fig. 5, the master bluetooth module 10 controls the communication network to be in a dormant state when the vehicle control command or the wake-up command sent by the virtual key 30 is not received within a preset time (long time) or the door opening action is not detected. As shown in fig. 5 from the operation mode P3 to the operation mode P5, the master bluetooth module 10 controls the communication network to be in the sleep state when the virtual key 30 is in the command sending area R2 and the keyless entry area R1 for a predetermined time and the vehicle control command or the wake-up command sent by the virtual key 30 is not received or the door opening action is not detected. As shown in fig. 5, the operating modes P2 to P1, the master bluetooth module 10 controls the communication network to be in a sleep state when the virtual key 30 is in the signal connection region R3 for a predetermined time and does not receive the vehicle control command or the wake-up command sent by the virtual key 30. As shown in fig. 5, the operation modes P2 to P4 control the communication network to be in the sleep state when the virtual key 30 is in the sleep region R4 for a predetermined time and the vehicle control command or the wake-up command sent by the virtual key 30 is not received.

Preferably, the slave bluetooth module 20 further has a wake-up switch (which may be disposed in the door handle), the wake-up switch outputs a wake-up command, the slave bluetooth module 20 wakes up the communication network according to the wake-up command and outputs the wake-up command to the master bluetooth module, and the master bluetooth module 20 exits from the sleep state according to the wake-up command. The wake-up switch may be a mechanical switch, or may be a wake-up sensor (e.g., a capacitor contactor, an inductive switch, etc.).

Referring to fig. 1, the master bluetooth module includes a control unit 11, a storage unit 13 and a bluetooth signal transceiver unit 12, which are electrically connected to the control unit 11, respectively, the bluetooth signal transceiver unit 12 receives a signal sent by a virtual key 30 and sends a broadcast message to the outside, and the storage unit 13 stores data.

With continued reference to fig. 1, the master bluetooth module 10 supplies power to the CAN unit from the power supply system of the vehicle through the LDO unit, and supplies power to the control unit 11 from the power supply system of the vehicle through the DCDC unit. The master bluetooth module 10 supplies power to the slave bluetooth module through the power supply unit 14, so that the slave bluetooth module 20 is in a working state or a sleep state, communicates with the slave bluetooth module 20 and the vehicle control system 300 through an LIN/CAN Network, and CAN control a communication Network (LIN/CAN Network) to sleep or wake up, wherein the master bluetooth module 10 communicates with the vehicle control system 30 through a Controller Area Network (CAN) and communicates with the slave control module through a Local Interconnect Network (LIN).

Preferably, the master bluetooth module 10 further determines the distance d1 between the virtual key 30 and the vehicle 200 according to the slave received signal strength, the master received signal strength, and the corresponding side boundary strength, in the operating mode, the master bluetooth module 10 sends a specific message to the virtual key 30 and records the sending time, the virtual key 30 records the receiving time after receiving the specific message and forwards the corresponding specific message information (the specific message, the receiving time, and the sending time), the master bluetooth module 10 receives the specific message information forwarded by the virtual key 30 and records the receiving time of the master bluetooth module, the specific message information includes the specific message, the time when the virtual key receives the specific message, and the time when the virtual key sends the specific message, the master bluetooth module 10 further calculates the distance d between the virtual key 30 and the vehicle 200 according to the measured arrival time, and correcting the distance d1 according to the distance d, wherein the distance d is c x ((Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of the electromagnetic wave in the air, Ttxb is the time when the main bluetooth module sends the specific message, Trxb is the time when the main bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message.

Preferably, the master bluetooth module 10 further sends an alarm signal to the virtual key 30 when the error between the distance d and the distance d1 is greater than a predetermined value. The virtual key 30 alerts the user according to the alarm signal.

Referring to fig. 6, the invention also discloses a vehicle keyless control method 400 based on multiple bluetooth received signal strengths, referring to fig. 2, a master bluetooth module 10 is installed in a vehicle 200, and a plurality of slave bluetooth modules 20 electrically connected with the master bluetooth module 10 are respectively installed at different sides outside the vehicle; the vehicle keyless control method 400 includes the steps of: (41) the master Bluetooth module collects signals sent by the calibrated virtual keys to obtain master received signal strength, and each slave Bluetooth module collects signals sent by the calibrated virtual keys to obtain slave received signal strength of the corresponding side; (42) and (43) judging the direction and distance of the virtual key relative to the vehicle according to the main received signal strength, the slave received signal strength of the corresponding side and the magnitude relation between the main received signal strength and the slave received signal strength of the corresponding side, and sending a corresponding control command to a vehicle control system according to the judgment result.

Referring to fig. 2, the types of installation positions of the slave bluetooth module 20 and the master bluetooth module 10 are as described above.

The step (42) specifically includes determining whether the virtual key is located within a first preset distance of the corresponding side of the vehicle according to a magnitude relationship between the received signal strength of the corresponding side and a preset limit strength of the corresponding side, and if so, sending a corresponding control command to a vehicle control system. And when the main received signal strength is greater than the left received signal strength, the right received signal strength and the rear received signal strength, judging that the virtual key is in the vehicle.

Before the step (41), the method further includes entering an initial mode according to the initial command when the bluetooth module is used for the first time or when the initial command is received, acquiring, in the initial mode, a signal sent by each virtual key calibrated within a preset time at a first preset distance from the corresponding side through each bluetooth module to obtain and store the boundary strength of the corresponding side, and the steps (41) and (42) are performed in an operating mode, which is a default mode in this embodiment and is in the operating mode unless the bluetooth module is used for the first time or the initial command is received. In the initial mode, the working mode can be entered according to an initial ending command or a working command.

Wherein, sending a corresponding control command to the vehicle control system specifically comprises: sending a corresponding access permission command to a vehicle control system within a first preset distance of the virtual key at the corresponding side of the vehicle to allow a corresponding vehicle door or a trunk to be opened; and issuing a start permission command to the vehicle control system to allow the vehicle to start when the virtual key is in the vehicle.

Referring to fig. 4, the step (42) further determines a location area of the virtual key according to a distance between the virtual key and the vehicle, and controls the operating modes of the master bluetooth module and the slave bluetooth module according to the location area of the virtual key, wherein a specific method for determining the location area of the virtual key according to the distance between the virtual key and the vehicle includes: the method comprises the steps of judging that a virtual key is located in a keyless entry area when the virtual key is located in a first preset distance of a corresponding side of a vehicle from a Bluetooth module or in the vehicle, judging that the virtual key is located in an instruction sending area when the virtual key is located between a second preset distance of the vehicle and the keyless entry area, judging that the virtual key is located in a signal connection area when the virtual key is located between a third preset distance of the vehicle and the instruction sending area, judging that the virtual key is located in a dormant area when the virtual key is located outside the third preset distance of the vehicle, wherein the second preset distance is larger than the first preset distance, and the third preset distance is larger than the second preset distance.

Referring to fig. 5, specifically, the controlling the working modes of the master bluetooth module and the slave bluetooth module according to the area where the virtual key is located includes: entering a sleep mode when the virtual key is in a sleep zone: the master Bluetooth module is in a dormant state and is awakened to send a broadcast message at regular time, the intensity of a received signal sent by a virtual key is collected when a signal sent by the virtual key is received so as to judge the area where the virtual key is located, and the slave Bluetooth module is in the dormant state; entering a connection mode when the virtual key is in a signal connection zone: the master Bluetooth module is connected with the virtual key and acquires the received signal strength of the virtual key to judge the area of the virtual key, and the slave Bluetooth module is in a dormant state; entering a control mode when the virtual key is in a command sending zone and a keyless entry zone: the master Bluetooth module and the slave Bluetooth module are respectively connected with the virtual key.

Wherein, the master bluetooth module communicates with the vehicle control system and the slave control module through the communication network respectively, step (42) further includes: when the virtual key is in a dormant area and a signal connection area, controlling the communication network to be in a dormant state, awakening the communication network when receiving a vehicle control instruction or an awakening command sent by the virtual key, and controlling the communication network to be in the dormant state when the virtual key enters a command sending area and a keyless entry area for preset time and does not receive the vehicle control instruction or the awakening command sent by the virtual key.

Wherein, main bluetooth module respectively through communication network with vehicle control system and follow control module carry out the communication, set up the awakening switch of output awakening command on following bluetooth module, still include the step: and awakening the communication network, the master Bluetooth module and the slave Bluetooth module according to the awakening command when the awakening command is received.

Wherein before the step (41), the method further comprises the steps of: the method comprises the steps that an initial mode is entered according to an initial command when the vehicle is used for the first time or the initial command is received, and in the initial mode, a calibration signal sent by an electronic device 500 with a virtual key is received through the main Bluetooth module, and a calibration relation is established between the vehicle and the virtual key according to the calibration signal. Specifically, virtual key information corresponding to a vehicle type and the calibration parameters corresponding to a virtual key type are stored in advance, in an initial mode, the electronic device 500 having the virtual key 30 around is searched, a calibration signal sent by the virtual key is received, the virtual key type is identified according to the calibration signal and the virtual key information, the calibration parameters corresponding to the virtual key are obtained, and a calibration relationship is established between the vehicle and the virtual key according to the calibration signal and the calibration parameters.

In this embodiment, the electronic device 500 having the virtual key 30 is a mobile terminal, but the electronic device may also be a watch or an electronic bracelet.

Wherein the step (41) further comprises: sending a specific message to the virtual key through the main bluetooth module and recording sending time, receiving specific message information forwarded by the virtual key through the main bluetooth module and recording receiving time, wherein the specific message information comprises the specific message, the time for the virtual key to receive the specific message and the time for the virtual key to send the specific message, and the step (42) further comprises: and judging the distance d1 between the virtual key and the vehicle according to the strength of the slave received signal, the strength of the master received signal and the strength of the corresponding side limit, calculating the distance d between the virtual key and the vehicle according to the measured arrival time, and correcting the distance d1 according to the distance d, wherein the distance d is c (Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of electromagnetic waves in the air, Ttxb is the time when the master Bluetooth module sends the specific message, Trxb is the time when the master Bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message.

Specifically, in the step (42), it is further determined whether a difference between the distance d and the distance d1 is greater than a predetermined value, and if so, an alarm signal is sent to the virtual key through the master bluetooth module to warn a user.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. The utility model provides a vehicle keyless control system based on many bluetooth received signal intensity which characterized in that: the system comprises a main Bluetooth module arranged in a vehicle and a plurality of slave Bluetooth modules arranged on different sides outside the vehicle and respectively electrically connected with the main Bluetooth module, wherein the main Bluetooth module collects signals sent by a calibrated virtual key to obtain main received signal strength in a working mode, each slave Bluetooth module collects signals sent by the virtual key to obtain slave received signal strength of a corresponding side and transmits the slave received signal strength to the main Bluetooth module, the main Bluetooth module judges the orientation and distance d1 of the virtual key relative to the vehicle according to the main received signal strength, the slave received signal strength of the corresponding side, the main received signal strength and the slave received signal strength of the corresponding side, and sends a corresponding control command to a vehicle control system according to the judgment result;

in the working mode, the main Bluetooth module sends a specific message to the virtual key, receives the specific message forwarded by the virtual key in response, calculates the distance d between the virtual key and the vehicle by measuring the arrival time of the specific message, and corrects the distance d1 according to the distance d.

2. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein:

the slave Bluetooth module comprises a left Bluetooth module arranged on the left side of the vehicle, a right Bluetooth module arranged on the right side of the vehicle and a rear Bluetooth module arranged on the rear side of the vehicle.

3. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 2 wherein: left side bluetooth module and right bluetooth module install respectively in handlebar department, outer running-board department, car post department or outside rear-view mirror department, back bluetooth module installs in rear of a vehicle outer bumper department or trunk button department, main bluetooth module installs in handrail case department in the car.

4. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: and the main Bluetooth module judges whether the virtual key is positioned in a first preset distance of the corresponding side of the vehicle according to the magnitude relation between the slave received signal strength of the side where the virtual key is positioned and the preset boundary strength of the side where the virtual key is positioned, and if so, sends a corresponding control command to a vehicle control system.

5. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 4 wherein: in an initial mode, each slave Bluetooth module collects signals sent by virtual keys calibrated in a first preset distance of the corresponding side within preset time and obtains the received signal strength of the signals so as to obtain the boundary strength of the corresponding side and transmit the boundary strength to the master Bluetooth module for storage.

6. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: and the master Bluetooth module judges that the virtual key is positioned at the side where the strongest slave received signal strength is positioned when the slave received signal strength of one side is greater than the slave received signal strengths of other sides and the master received signal strength, and judges that the virtual key is positioned in the vehicle when the master received signal strength is greater than each slave received signal strength.

7. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the main Bluetooth module sends a corresponding access permission command to a vehicle control system within a first preset distance when the virtual key is located at the corresponding side of the vehicle so as to allow a corresponding vehicle door or a trunk to be opened; the master Bluetooth module issues a start allowing command to the vehicle control system to allow the vehicle to start when the virtual key is in the vehicle.

8. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: in the working mode, the master Bluetooth module judges that the virtual key is in a keyless entry area when the virtual key is in a first preset distance of a slave Bluetooth module on the corresponding side of the vehicle or in the vehicle, when the virtual key is between a second preset distance of the vehicle and the keyless entry zone, judging that the virtual key is in the instruction sending zone, when the virtual key is positioned between a third preset distance of the vehicle and the instruction sending area, the virtual key is judged to be positioned in the signal connecting area, determining that the virtual key is in a sleep zone when the virtual key is outside a third preset distance of the vehicle, the master Bluetooth module and the slave Bluetooth module carry out corresponding working modes according to the area where the virtual key is located, the second preset distance is greater than the first preset distance, and the third preset distance is greater than the second preset distance.

9. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 8 wherein: the master Bluetooth module controls the master Bluetooth module and the slave Bluetooth module to enter corresponding working modes according to the area where the virtual key is located:

the main Bluetooth module enters a sleep mode when the virtual key is in a sleep zone: the master Bluetooth module is in a dormant state and is used for waking up and sending a broadcast message at regular time so as to receive a signal sent by the virtual key, and the slave Bluetooth module is in the dormant state;

the main Bluetooth module enters a connection mode when the virtual key is in a signal connection zone: the master Bluetooth module is connected with the virtual key, and the slave Bluetooth module is in a dormant state;

the main Bluetooth module enters a control mode when the virtual key is in an instruction sending area and a keyless entry area: the master Bluetooth module and the slave Bluetooth module are respectively connected with the virtual key.

10. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the master Bluetooth module is respectively communicated with the vehicle control system and the slave control module through communication networks, the master Bluetooth module controls the communication networks to be in a dormant state when the virtual key is in a dormant area and a signal connection area, and awakens the communication networks when receiving a vehicle control instruction or an awakening command sent by the virtual key, and controls the communication networks to be in the dormant state when the virtual key enters the instruction sending area and the keyless entry area for preset time and does not receive the vehicle control instruction or the awakening command sent by the virtual key.

11. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the main Bluetooth module is communicated with the vehicle control system and the slave control module through communication networks respectively, the slave Bluetooth module is further provided with a wake-up switch, the wake-up switch outputs a wake-up command, the slave Bluetooth module wakes up the communication networks according to the wake-up command and outputs the wake-up command to the main Bluetooth module, and the main Bluetooth module exits from a sleep state according to the wake-up command.

12. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the main Bluetooth module enters an initial mode when being used for the first time or according to an initial command: the main Bluetooth module receives a calibration signal sent by electronic equipment with a virtual key and establishes a calibration relation between a vehicle and the virtual key according to the calibration signal.

13. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 12 wherein: the main Bluetooth module is used for searching electronic equipment with virtual keys around in an initial mode, receiving calibration signals sent by the virtual keys, identifying the types of the virtual keys according to the calibration signals and the virtual key information, acquiring calibration parameters corresponding to the virtual keys, and establishing a calibration relation between the vehicle and the virtual keys according to the calibration signals and the calibration parameters.

14. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the electronic equipment with the virtual key is a mobile terminal, a watch or an electronic bracelet.

15. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 1 wherein: the master Bluetooth module further determines a distance d1 between the virtual key and the vehicle according to the strength of the slave received signal, the strength of the master received signal, and the strength of the corresponding side boundary, and in an operating mode, the master Bluetooth module sends a specific message to the virtual key and records a sending time, and receives specific message information forwarded by the virtual key and records an receiving time, wherein the specific message information includes the specific message, the time when the virtual key receives the specific message, and the time when the virtual key sends the specific message, the master Bluetooth module further calculates a distance d between the virtual key and the vehicle according to the measured arrival time, corrects the distance d1 according to the distance d, the distance d is c x (Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of the electromagnetic wave in the air, and Ttxb is the time when the master Bluetooth module sends the specific message, trxb is the time when the main Bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message.

16. The vehicle keyless control system based on multiple bluetooth received signal strengths of claim 15 wherein: the master Bluetooth module also sends an alarm signal to the virtual key to warn a user when the error between the distance d and the distance d1 is larger than a preset value.

17. A vehicle keyless control method based on multiple Bluetooth receiving signal intensity is characterized in that:

a master Bluetooth module is installed in the vehicle, and a plurality of slave Bluetooth modules electrically connected with the master Bluetooth module are respectively installed on different sides outside the vehicle;

the method comprises the following steps:

(1) acquiring signals sent by the calibrated virtual keys through the master Bluetooth module to obtain master received signal strength, and acquiring signals sent by the calibrated virtual keys through each slave Bluetooth module to obtain slave received signal strength of the corresponding side;

(2) judging the direction and the distance of the virtual key relative to the vehicle according to the main received signal strength, the slave received signal strength of the corresponding side, the main received signal strength and the slave received signal strength of the corresponding side, and sending a corresponding control command to a vehicle control system according to a judgment result;

in the working mode, a specific message is sent to the virtual key through the main Bluetooth module, the specific message forwarded by the virtual key in response is received, the distance d between the virtual key and the vehicle is calculated by measuring the arrival time of the specific message, and the distance d1 is corrected according to the distance d.

18. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the slave Bluetooth module comprises a left Bluetooth module arranged on the left side of the vehicle, a right Bluetooth module arranged on the right side of the vehicle and a rear Bluetooth module arranged on the rear side of the vehicle.

19. The method of claim 18 for keyless control of a vehicle based on multiple bluetooth received signal strengths, wherein: left side bluetooth module and right bluetooth module install respectively in handlebar department, outer running-board department, car post department or outside rear-view mirror department, back bluetooth module installs in rear of a vehicle outer bumper department or trunk button department, main bluetooth module installs in handrail case department in the car.

20. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: in the step (2), whether the virtual key is located within a first preset distance of the corresponding side of the vehicle is judged according to the magnitude relation between the received signal strength of the side where the virtual key is located and the preset limit strength of the side where the virtual key is located, and if yes, a corresponding control command is sent to a vehicle control system.

21. The method of claim 20, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: before the step (1), the method further comprises the steps of entering an initial mode according to an initial command when the method is used for the first time or when the initial command is received, acquiring signals sent by virtual keys calibrated within a first preset distance of the corresponding side from the Bluetooth module and obtaining received signal strength of the signals so as to obtain and store limit strength of the corresponding side in the initial mode, and executing the steps (1) and (2) in a working mode.

22. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: in the step (2), when the slave received signal strength of one side is greater than the slave received signal strength and the master received signal strength of the other sides, it is determined that the virtual key is located at the side where the strongest slave received signal strength is located, and when the master received signal strength is greater than each slave received signal strength, it is determined that the virtual key is located in the vehicle.

23. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the step of sending a corresponding control command to the vehicle control system specifically includes:

sending a corresponding access permission command to a vehicle control system within a first preset distance of the virtual key at the corresponding side of the vehicle to allow a corresponding vehicle door or a trunk to be opened;

and issuing a start permission command to the vehicle control system to allow the vehicle to start when the virtual key is in the vehicle.

24. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the step (2) further comprises the steps of judging the area of the virtual key according to the distance of the virtual key relative to the vehicle, and controlling the working modes of the master Bluetooth module and the slave Bluetooth module according to the area of the virtual key, wherein the specific method for judging the area of the virtual key according to the distance of the virtual key relative to the vehicle comprises the following steps: the method comprises the steps of judging that a virtual key is located in a keyless entry area when the virtual key is located in a first preset distance of a corresponding side of a vehicle from a Bluetooth module or in the vehicle, judging that the virtual key is located in an instruction sending area when the virtual key is located between a second preset distance of the vehicle and the keyless entry area, judging that the virtual key is located in a signal connection area when the virtual key is located between a third preset distance of the vehicle and the instruction sending area, judging that the virtual key is located in a dormant area when the virtual key is located outside the third preset distance of the vehicle, wherein the second preset distance is larger than the first preset distance, and the third preset distance is larger than the second preset distance.

25. The method of claim 22, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the method specifically comprises the following steps of controlling the working modes of the master Bluetooth module and the slave Bluetooth module according to the area where the virtual key is located:

entering a sleep mode when the virtual key is in a sleep zone: the master Bluetooth module is in a dormant state and is awakened to send a broadcast message at regular time, the intensity of a received signal sent by a virtual key is collected when a signal sent by the virtual key is received so as to judge the area where the virtual key is located, and the slave Bluetooth module is in the dormant state;

entering a connection mode when the virtual key is in a signal connection zone: the master Bluetooth module is connected with the virtual key and acquires the received signal strength of the virtual key to judge the area of the virtual key, and the slave Bluetooth module is in a dormant state;

entering a control mode when the virtual key is in a command sending zone and a keyless entry zone: the master Bluetooth module and the slave Bluetooth module are respectively connected with the virtual key.

26. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the master bluetooth module communicates with the vehicle control system and the slave control module through a communication network, respectively, step (2) further includes: when the virtual key is in a dormant area and a signal connection area, controlling the communication network to be in a dormant state, awakening the communication network when receiving a vehicle control instruction or an awakening command sent by the virtual key, and controlling the communication network to be in the dormant state when the virtual key enters a command sending area and a keyless entry area for preset time and does not receive the vehicle control instruction or the awakening command sent by the virtual key.

27. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the main bluetooth module respectively through communication network with vehicle control system and slave control module carry out the communication, still include the step: and a wake-up switch for outputting a wake-up command is arranged on the slave Bluetooth module, and the communication network, the master Bluetooth module and the slave Bluetooth module are awakened according to the wake-up command when the wake-up command is received.

28. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the method also comprises the following steps before the step (1): the method comprises the steps that when the vehicle is used for the first time or an initial command is received, the vehicle enters an initial mode according to the initial command, in the initial mode, a calibration signal sent by electronic equipment with a virtual key is received through a main Bluetooth module, a calibration relation is established between the vehicle and the virtual key according to the calibration signal, and the steps (1) and (2) are executed in a working mode.

29. The method of claim 28, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the method comprises the steps of storing virtual key information corresponding to a vehicle type and calibration parameters corresponding to the virtual key type in advance, searching electronic equipment with virtual keys around through a main Bluetooth module in an initial mode, receiving calibration signals sent by the virtual keys, identifying the virtual key type according to the calibration signals and the virtual key information, obtaining the calibration parameters corresponding to the virtual keys, and establishing a calibration relation between a vehicle and the virtual keys according to the calibration signals and the calibration parameters.

30. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the electronic equipment with the virtual key is a mobile terminal, a watch or an electronic bracelet.

31. The method of claim 17, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: the step (1) further comprises: sending a specific message to the virtual key through the main Bluetooth module and recording sending time, receiving specific message information forwarded by the virtual key through the main Bluetooth module and recording receiving time, wherein the specific message information comprises the specific message, the time for the virtual key to receive the specific message and the time for the virtual key to send the specific message, and the step (2) further comprises the following steps: and judging the distance d1 between the virtual key and the vehicle according to the strength of the slave received signal, the strength of the master received signal and the strength of the corresponding side limit, calculating the distance d between the virtual key and the vehicle according to the measured arrival time, and correcting the distance d1 according to the distance d, wherein the distance d is c (Trxb-Ttxb) - (Ttxp-Trxp))/2, c is the propagation speed of electromagnetic waves in the air, Ttxb is the time when the master Bluetooth module sends the specific message, Trxb is the time when the master Bluetooth module receives the specific message forwarded by the virtual key, Trxp is the time when the virtual key receives the specific message, and Ttxp is the time when the virtual key forwards the specific message.

32. The method of claim 31, wherein the vehicle keyless control based on multiple bluetooth received signal strengths comprises: and judging whether the difference between the distance d and the distance d1 is greater than a preset value, and if so, sending an alarm signal to the virtual key through the main Bluetooth module to warn a user.

33. An electronic device, comprising:

the Bluetooth car comprises a main Bluetooth module arranged in a car and a plurality of slave Bluetooth modules which are arranged on different sides outside the car and are respectively and electrically connected with the main Bluetooth module;

one or more processors;

a memory; and

one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors, the programs comprising instructions for performing the multi-bluetooth received signal strength based vehicle keyless control method of any of claims 17-32.

34. A computer-readable storage medium comprising a computer program for use in conjunction with a master bluetooth module installed in a vehicle and a plurality of slave bluetooth modules installed on different sides of the vehicle and electrically connected to the master bluetooth module, respectively, characterized in that: the computer program is executable by a processor to implement the multiple bluetooth received signal strength based vehicle keyless control method as claimed in any one of claims 17 to 32.