Method and device for positioning vehicle key area, processor and computer readable storage medium thereof

Abstract

The invention relates to a method for positioning a vehicle key area, which comprises the following steps of: respectively dividing four low-frequency antenna positioning nodes outside an armrest box, a driving side, a co-driving side and a trunk in a vehicle into a first antenna, a second antenna, a third antenna and a fourth antenna, and calibrating an area boundary threshold value by drawing a circle for each antenna; determining field intensity values of positions where keys of the first antenna, the second antenna, the third antenna and the fourth antenna are located; and judging the position of the key area according to the field intensity values of the first antenna, the second antenna, the third antenna and the fourth antenna. The invention further relates to a device for positioning the vehicle key area, a processor and a computer readable storage medium of the processor. According to the method and the device for positioning the vehicle key area, the processor and the computer readable storage medium thereof, based on the obtained RSSI field intensity value, multiple circle drawing combined judgment is performed through different boundary thresholds, so that the identification of a special area outside the vehicle is increased, the blind area and overflow area range of position judgment by a single circle drawing method is reduced, and the positioning accuracy of the vehicle key area is improved. The positioning accuracy of the intelligent key is improved, and more accurate control over the vehicle is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to the field of vehicle key positioning, and specifically refers to a method, device, processor and computer-readable storage medium thereof for realizing vehicle key area positioning. Background Art

[0002] With the continuous development of modern automobile technology, the original mechanical car key has gradually evolved into a smart key for touchless entry and start. Compared with the traditional mechanical key, the keyless entry (Passive Entry, PE) and keyless start (Passive Start, PS) functions of the smart key have realized more intelligent access control management and a more touchless user experience.

[0003] The basic working principle of the PEPS system is that when the module receives a request to find the key (pressing the start switch or other triggers), it drives the low-frequency antenna to transmit a low-frequency signal. After the antenna inside the key receives it, it converts the signal strength in the x, y, and z axis directions into a voltage signal according to a certain algorithm, also known as RSSI (Received Signal Strength Indicator), and then transmits it back to the PEPS system via high frequency. After receiving it, the system determines the current key position based on the internally set algorithm and calibration data, and executes the start or unlock function.

[0004] The PEPS system locates the user's smart key through wireless technology and gives corresponding control instructions based on the located position. It can be seen that the detection accuracy of the key position is one of the important parameters to measure the quality of a PEPS system. The traditional key position is divided into areas by drawing circles with the antenna boundary. The judgment of the in-car area is determined by the intersection of the in-car antenna within the body boundary, and the out-of-car area is determined by removing the in-car part from the farthest position of the corresponding door-side antenna. However, when dividing the actual area, since the cross-section of the vehicle is almost square, in addition to the normal in-car and out-of-car coverage areas, there are also special areas such as blind spots and overflow areas that are difficult to detect by drawing circles with a single antenna. How to design reasonable blind spots and overflow areas without affecting the normal use of functions and user experience is a technical problem that needs to be improved at present. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, device, processor and computer-readable storage medium for realizing vehicle key area positioning which are simple to operate, highly accurate and have a wide range of applications.

[0006] In order to achieve the above-mentioned purpose, the method, device, processor and computer-readable storage medium for realizing vehicle key area positioning of the present invention are as follows:

[0007] The method for realizing vehicle key area positioning has the following main features:

[0008] (1) The four low-frequency antenna positioning nodes in the armrest box, the driver's side exterior, the passenger side exterior, and the trunk exterior are divided into the first antenna, the second antenna, the third antenna, and the fourth antenna, respectively, and the area boundary threshold is calibrated by drawing a circle for each antenna;

[0009] (2) Determine the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the key location of the first antenna, the second antenna, the third antenna and the fourth antenna;

[0010] (3) Determine the key area position according to the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the first antenna, the second antenna, the third antenna and the fourth antenna.

[0011] Preferably, the first antenna is divided into three areas according to different thresholds, namely INT1OUT, INT1Thread2 and INT1Thread3, wherein INT1OUT is the first in-car antenna threshold, covering the front windshield and trunk; INT1Thread2 is the second in-car antenna threshold, including the front windshield; INT1Thread3 is the third in-car antenna threshold, between the two side windows.

[0012] Preferably, the second antenna and the third antenna are divided into five areas according to different thresholds, namely EXTOUT, EXTThread2, EXTThread3, EXTThread4 and EXTSideOUT, wherein EXTOUT is the first external antenna threshold, covering all areas of the vehicle; EXTThread2 is the second external antenna threshold, covering the opposite side window; EXTThread3 is the third external antenna threshold, covering the rearview mirror; EXTThread4 is the fourth external antenna threshold, which is the area near the antenna; EXTSideOUT is the antenna side PE effective distance threshold.

[0013] Preferably, the fourth antenna is divided into an area according to a threshold value, which is EXTRearOUT, that is, the trunk PE effective distance threshold.

[0014] Preferably, the area divisions of the first antenna, the second antenna, the third antenna and the fourth antenna are superimposed to form a plurality of special identification areas outside the vehicle.

[0015] Preferably, the step (3) specifically comprises the following steps:

[0016] (3.1) Determine whether RSSI_1 is less than INT1OUT, RSSI_2 is less than EXTSideOUT, RSSI_3 is less than EXTSideOUT, and RSSI_4 is less than EXTRearOUT. If yes, the key is currently in the invalid area; otherwise, proceed to step (3.2);

[0017] (3.2) Determine whether any of the conditions of RSSI_1 being less than INT1OUT or RSSI_2 being less than EXTOUT or RSSI_3 being less than EXTOUT is satisfied. If so, the key is in the effective area outside the vehicle, and proceed to step (3.3); otherwise, proceed to step (3.4);

[0018] (3.3) Determine the location of the key outside the vehicle;

[0019] (3.4) Determine whether RSSI_1 is greater than or equal to INT1Thread3. If so, the key is in the car; otherwise, continue to step (3.5);

[0020] (3.5) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.6);

[0021] (3.6) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.7);

[0022] (3.7) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread3 and RSSI_3 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.8);

[0023] (3.8) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread3 and RSSI_2 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.9);

[0024] (3.9) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is at a specific location outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.10);

[0025] (3.10) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If so, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with the key being in the vehicle.

[0026] Preferably, the step (3.3) specifically comprises the following steps:

[0027] (3.3.1) Determine whether RSSI_2 is greater than or equal to RSSI_3 and RSSI_2 is greater than or equal to RSSI_4. If so, the key is in the driver's side PE area; otherwise, continue to step (3.3.2);

[0028] (3.3.2) Determine whether RSSI_3 is greater than or equal to RSSI_2 and RSSI_3 is greater than or equal to RSSI_4. If so, the key is in the PE area on the passenger side; otherwise, proceed to step (3.3.3);

[0029] (3.3.3) Determine whether RSSI_4 is greater than or equal to RSSI_2 and RSSI_4 is greater than or equal to RSSI_3. If so, the key is in the tailgate PE area; otherwise, end the step.

[0030] The main feature of the device for realizing vehicle key area positioning is that the device comprises:

[0031] a processor configured to execute computer-executable instructions;

[0032] The memory stores one or more computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the above-mentioned method for locating the vehicle key area are implemented.

[0033] The main feature of the processor for realizing vehicle key area positioning is that the processor is configured to execute computer executable instructions, and when the computer executable instructions are executed by the processor, the various steps of the above-mentioned method for realizing vehicle key area positioning are realized.

[0034] The main feature of the computer-readable storage medium is that a computer program is stored thereon, and the computer program can be executed by a processor to implement the various steps of the above-mentioned method for locating the vehicle key area.

[0035] The method, device, processor and computer-readable storage medium for realizing vehicle key area positioning of the present invention are adopted. Based on the acquired RSSI field strength value, multiple circles with different boundary thresholds are used for joint judgment, which increases the recognition of special areas outside the vehicle, reduces the blind spots and overflow areas of the position determined by a single circle drawing method, improves the positioning accuracy of the smart key, and facilitates more accurate control of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the division of the in-vehicle antenna coverage area for the method for realizing vehicle key area positioning of the present invention.

[0037] Figure 2 A schematic diagram of dividing the coverage area of ​​an external vehicle antenna taking the driver's side as an example of the method for realizing vehicle key area positioning of the present invention.

[0038] Figure 3 It is a special determined effective identification area outside the vehicle for realizing the method for locating the vehicle key area of ​​the present invention.

[0039] Figure 4 The present invention is a flow chart of a key area positioning method for realizing a vehicle key area positioning method.

[0040] Reference numerals:

[0041] 1 First Antenna

[0042] 2 Second Antenna

[0043] 3 Third Antenna

[0044] 4 Fourth Antenna DETAILED DESCRIPTION

[0045] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0046] The method for realizing vehicle key area positioning of the present invention comprises the following steps:

[0047] (1) The four low-frequency antenna positioning nodes in the armrest box, the driver's side exterior, the passenger side exterior, and the trunk exterior are divided into the first antenna, the second antenna, the third antenna, and the fourth antenna, respectively, and the area boundary threshold is calibrated by drawing a circle for each antenna;

[0048] (2) Determine the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the key location of the first antenna, the second antenna, the third antenna and the fourth antenna;

[0049] (3) Determine the key area position according to the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the first antenna, the second antenna, the third antenna and the fourth antenna.

[0050] As a preferred embodiment of the present invention, the first antenna is divided into three areas according to different thresholds, namely INT1OUT, INT1Thread2 and INT1Thread3, wherein INT1OUT is the first in-vehicle antenna threshold, covering the front windshield and trunk; INT1Thread2 is the second in-vehicle antenna threshold, including the front windshield; INT1Thread3 is the third in-vehicle antenna threshold, between the two side windows.

[0051] As a preferred embodiment of the present invention, the second antenna and the third antenna are divided into five areas according to different thresholds, namely EXTOUT, EXTThread2, EXTThread3, EXTThread4 and EXTSideOUT, wherein EXTOUT is the first external antenna threshold, covering all areas of the vehicle; EXTThread2 is the second external antenna threshold, covering the opposite side window; EXTThread3 is the third external antenna threshold, covering the rearview mirror; EXTThread4 is the fourth external antenna threshold, which is the area near the antenna; EXTSideOUT is the antenna side PE effective distance threshold.

[0052] As a preferred implementation manner of the present invention, the fourth antenna is divided into an area according to a threshold value, which is EXTRearOUT, that is, the trunk PE effective distance threshold.

[0053] As a preferred embodiment of the present invention, the area divisions of the first antenna, the second antenna, the third antenna and the fourth antenna are superimposed to form a plurality of special identification areas outside the vehicle.

[0054] As a preferred embodiment of the present invention, the step (3) specifically comprises the following steps:

[0055] (3.1) Determine whether RSSI_1 is less than INT1OUT, RSSI_2 is less than EXTSideOUT, RSSI_3 is less than EXTSideOUT, and RSSI_4 is less than EXTRearOUT. If yes, the key is currently in the invalid area; otherwise, proceed to step (3.2);

[0056] (3.2) Determine whether any of the conditions of RSSI_1 being less than INT1OUT or RSSI_2 being less than EXTOUT or RSSI_3 being less than EXTOUT is satisfied. If so, the key is in the effective area outside the vehicle, and proceed to step (3.3); otherwise, proceed to step (3.4);

[0057] (3.3) Determine the location of the key outside the vehicle;

[0058] (3.4) Determine whether RSSI_1 is greater than or equal to INT1Thread3. If so, the key is in the car; otherwise, continue to step (3.5);

[0059] (3.5) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.6);

[0060] (3.6) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.7);

[0061] (3.7) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread3 and RSSI_3 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.8);

[0062] (3.8) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread3 and RSSI_2 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.9);

[0063] (3.9) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is at a specific location outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.10);

[0064] (3.10) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If so, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with the key being in the vehicle.

[0065] As a preferred embodiment of the present invention, the step (3.3) specifically includes the following steps:

[0066] (3.3.1) Determine whether RSSI_2 is greater than or equal to RSSI_3 and RSSI_2 is greater than or equal to RSSI_4. If so, the key is in the driver's side PE area; otherwise, continue to step (3.3.2);

[0067] (3.3.2) Determine whether RSSI_3 is greater than or equal to RSSI_2 and RSSI_3 is greater than or equal to RSSI_4. If so, the key is in the PE area on the passenger side; otherwise, proceed to step (3.3.3);

[0068] (3.3.3) Determine whether RSSI_4 is greater than or equal to RSSI_2 and RSSI_4 is greater than or equal to RSSI_3. If so, the key is in the tailgate PE area; otherwise, end the step.

[0069] The device for realizing vehicle key area positioning of the present invention, wherein the device comprises:

[0070] a processor configured to execute computer-executable instructions;

[0071] The memory stores one or more computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the above-mentioned method for locating the vehicle key area are implemented.

[0072] The processor for realizing vehicle key area positioning of the present invention, wherein the processor is configured to execute computer executable instructions, and when the computer executable instructions are executed by the processor, the various steps of the above-mentioned method for realizing vehicle key area positioning are realized.

[0073] The computer-readable storage medium of the present invention stores a computer program thereon, and the computer program can be executed by a processor to implement the various steps of the above-mentioned method for locating a vehicle key area.

[0074] In a specific embodiment of the present invention, a software positioning algorithm is provided to improve the key position determination area. By increasing the recognition of special areas outside the vehicle, reducing the range of blind spots and overflow areas, the problem of the software being unable to recognize the smart key normally when it is placed in a legal area is reduced, and the accuracy of key area positioning is improved.

[0075] The determination of the key position includes: drawing multiple circles according to boundary thresholds of different areas. After the field strength value is obtained, the key positioning method determines the specific position of the key.

[0076] The key positioning method recognizes the special area outside the vehicle. Combined with the key positioning method, the area outside the vehicle close to the vehicle body is specially identified, reducing the overflow area of ​​the key position determination inside the vehicle.

[0077] Combined with the key positioning method, since special identification is made for the area outside the car close to the car body, the boundary threshold of the interior area can be reasonably enlarged, reducing the blind spots where the position of the key inside the car is difficult to determine the boundaries of the four corners of the car: the left front, left rear, right front, and right rear.

[0078] In order to achieve the above object, a method for locating a key area of ​​a vehicle is provided, which determines the key area position by obtaining the intersection of effective areas in mathematical concepts through multiple circle drawing.

[0079] Figure 1 This is a schematic diagram of the division of the antenna coverage area in the car.

[0080] The four low-frequency antenna positioning nodes located in the armrest box, the driver's side, the co-pilot's side, and the trunk are respectively referred to as the first antenna 1, the second antenna 2, the third antenna 3, and the fourth antenna 4. The following are the area boundary thresholds of each antenna marked by a circle:

[0081] like Figure 1As shown, the first antenna (in-car armrest box) is divided into three areas according to different thresholds, namely:

[0082] INT1OUT: The first in-car antenna threshold, which requires that the front windshield and the trunk are fully covered;

[0083] INT1Thread2: The second in-car antenna threshold, which requires the front windshield to be included;

[0084] INT1Thread3: The third in-car antenna threshold is required to reach the windows on both sides.

[0085] Figure 2 This is a schematic diagram of the coverage area of ​​the external antenna (taking the driver's side as an example). Figure 2 As shown, the second antenna (outside the driver's side) is divided into five areas according to different thresholds, namely:

[0086] EXTOUT: The first external antenna threshold, which is required to cover all areas of the vehicle;

[0087] EXTThread2: The second vehicle exterior antenna threshold, which is required to cover the opposite side window;

[0088] EXTThread3: The third vehicle exterior antenna threshold, which is required to cover the rearview mirror;

[0089] EXTThread4: The fourth external antenna threshold, taking the area near the antenna;

[0090] EXTSideOUT: Antenna side PE effective distance threshold.

[0091] The third antenna (outside the co-pilot side) is similar to the second antenna and is divided into five areas according to different thresholds.

[0092] The fourth antenna (outside the trunk) is divided into an area according to the threshold, which is:

[0093] EXTRearOUT: Trunk PE effective distance threshold.

[0094] Among them, RSSI_1, RSSI_2, RSSI_3, and RSSI_4 represent the field strength values ​​of the key positions of the first low-frequency antenna, the second low-frequency antenna, the third low-frequency antenna, and the fourth low-frequency antenna, respectively. The larger the field strength value, the closer the key is to the antenna, and the smaller the field strength value, the farther the key is from the antenna.

[0095] The division and superposition of each antenna area are visible Figure 3 The part marked with color blocks in the figure is the special identification area outside the vehicle of this judgment method.

[0096] Determination of the position of the key outside the vehicle: Through the field strength threshold circles of each antenna defined above, the intersection of multiple threshold circles of the effective area outside the vehicle is obtained (detailed description in the specific implementation method). When the field strength values ​​of each antenna replied by the key are within the above-divided effective area, the key is considered to be within the effective distance outside the vehicle. At this time, when the field strength value of a certain outer antenna is greater than the field strength values ​​of the other two outer antennas, the key is considered to be near this outer antenna.

[0097] Determination of the key position in the car: When the field strength values ​​of the left and right external antennas are greater than EXTOUT and the field strength value of the internal antenna is greater than INT1OUT and the key is not in the effective area outside the car, it is considered that the key is in the car.

[0098] Figure 3 The areas 11, 22, 33, 44, 55, and 66 above refer to the first outside vehicle special identification area, the second outside vehicle special identification area, the third outside vehicle special identification area, the fourth outside vehicle special identification area, and the fifth outside vehicle special identification area, respectively.

[0099] Get the field strength values ​​RSSI_1, RSSI_2, RSSI_3, and RSSI_4 of the first, second, third, and fourth low-frequency antennas to determine the key area position. For the determination process, see Figure 4 .

[0100] S101: If RSSI_1 is less than INT1OUT, RSSI_2 is less than EXTSideOUT, RSSI_3 is less than EXTSideOUT, and RSSI_4 is less than EXTRearOUT, the above conditions are met, and the key is outside the boundary intersection of the maximum circle area of ​​each antenna, and it is considered that the key is currently in an invalid area. If the above conditions are not met, execute S102.

[0101] S102: If RSSI_1 is less than INT1OUT or RSSI_2 is less than EXTOUT or RSSI_3 is less than EXTOUT, and any of the conditions are met, it is considered that the key is in the effective area outside the vehicle, and S110, S111, and S112 are executed. When the field strength value of a certain outer antenna is greater than the field strength values ​​of the other two outer antennas, it is considered that the key is near the outer area of ​​the outer antenna. If S102 is not met, S103 is executed.

[0102] S103: If RSSI_1 is greater than or equal to INT1Thread3, it is considered that the key is in the car and the condition is not met, and S104 is executed.

[0103] S104: If RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4, the above conditions are met and the key is in the sixth special identification area outside the vehicle. Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S104 is not satisfied, execute S105.

[0104] S105: If RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4, the above conditions are met and the key is in the third special identification area outside the vehicle. Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S105 is not satisfied, execute S106.

[0105] S106: If RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread3 and RSSI_3 is less than EXTThread4, the above conditions are met and the key is in the fourth special identification area outside the vehicle, see Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S106 is not satisfied, execute S107.

[0106] S107: If RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread3 and RSSI_2 is less than EXTThread4, the above conditions are met and the key is in the first special identification area outside the vehicle. Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S107 is not satisfied, execute S108.

[0107] S108: If RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4, the above conditions are met and the key is in the fifth special identification area outside the vehicle. Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S108 is not satisfied, execute S109.

[0108] S109: If RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4, the above conditions are met and the key is in the second special identification area outside the vehicle. Figure 3 , execute S110, S111, S112 to determine the specific location of the key outside the vehicle. If S109 is not satisfied, it is considered that the key is inside the vehicle.

[0109] The present invention applies radio frequency identification positioning technology, abbreviated as RFID, also known as wireless radio frequency identification, which is a technology that uses wireless communication of radio frequency signals to achieve automatic target identification. The characteristics of the target RFID tag are read by a set of fixed readers, thereby realizing object identification and data transmission, without the need to establish mechanical or optical contact between the identification system and the specific target.

[0110] The present invention is based on the acquired RSSI field strength value, takes the antenna as the center and different field strength thresholds as the radius to divide the boundary circle area. Each circle area can be divided into different area positions in the mathematical concepts of intersection, union and complement. Based on this principle, the acquired RSSI field strength value is compared with the corresponding boundary threshold through an algorithm to determine the current area where the key is located and locate the key.

[0111] The present invention uses different thresholds as radii, draws multiple circles, and uses the intersection, union, and complement of each circular area to jointly divide it into different areas for judgment. The present invention also combines the intersection and complement of the area in mathematical concepts to make more detailed area division judgment.

[0112] The present invention provides a detailed description of the algorithm for determining the key area position. Based on the RSSI field strength values ​​obtained from different antennas, in the judgment process, it provides a detailed description of which threshold the obtained field strength value should be compared with, how to compare it, and the key position determined after the comparison.

[0113] The present invention uses wireless radio frequency identification and field strength positioning algorithm to determine the key position. Although the positioning principles of the two are different, they will inevitably have positioning blind spots and overflow areas. Based on field strength positioning, the present invention increases the recognition of special areas outside the vehicle through software positioning algorithm, which can effectively reduce the scope of blind spots and overflow areas generated by field strength positioning.

[0114] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0115] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0116] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0117] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0118] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution device. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0119] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the corresponding program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0120] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0121] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0122] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0123] The method, device, processor and computer-readable storage medium for realizing vehicle key area positioning of the present invention are adopted. Based on the acquired RSSI field strength value, multiple circles with different boundary thresholds are used for joint judgment, which increases the recognition of special areas outside the vehicle, reduces the blind spots and overflow areas of the position determined by a single circle drawing method, improves the positioning accuracy of the smart key, and facilitates more accurate control of the vehicle.

[0124] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A method for locating a vehicle key area, characterized in that: The method comprises the following steps: (1) The four low-frequency antenna positioning nodes in the armrest box, the driver's side exterior, the passenger side exterior, and the trunk exterior are divided into the first antenna, the second antenna, the third antenna, and the fourth antenna, respectively, and the area boundary threshold is calibrated by drawing a circle for each antenna; (2) Determine the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the key location of the first antenna, the second antenna, the third antenna and the fourth antenna; (3) Determine the key area position according to the field strength values ​​RSSI_1, RSSI_2, RSSI_3 and RSSI_4 of the first antenna, the second antenna, the third antenna and the fourth antenna.

2. The method for realizing vehicle key area positioning according to claim 1, characterized in that: The first antenna is divided into three areas according to different thresholds, namely INT1OUT, INT1Thread2 and INT1Thread3, where INT1OUT is the first in-car antenna threshold, covering the front windshield and trunk; INT1Thread2 is the second in-car antenna threshold, including the front windshield; INT1Thread3 is the third in-car antenna threshold, between the two side windows.

3. The method for realizing vehicle key area positioning according to claim 1, characterized in that: The second antenna and the third antenna are divided into five areas according to different thresholds, namely EXTOUT, EXTThread2, EXTThread3, EXTThread4 and EXTSideOUT, where EXTOUT is the first external antenna threshold, covering all areas of the vehicle; EXTThread2 is the second external antenna threshold, covering the opposite side window; EXTThread3 is the third external antenna threshold, covering the rearview mirror; EXTThread4 is the fourth external antenna threshold, which is the area near the antenna; EXTSideOUT is the antenna side PE effective distance threshold.

4. The method for realizing vehicle key area positioning according to claim 1, characterized in that: The fourth antenna is divided into an area according to the threshold, which is EXTRearOUT, that is, the trunk PE effective distance threshold.

5. The method for realizing vehicle key area positioning according to claim 1, characterized in that: The area divisions of the first antenna, the second antenna, the third antenna and the fourth antenna are superimposed to form a plurality of special identification areas outside the vehicle.

6. The method for realizing vehicle key area positioning according to claim 1, characterized in that: The step (3) specifically comprises the following steps: (3.1) Determine whether RSSI_1 is less than INT1OUT, RSSI_2 is less than EXTSideOUT, RSSI_3 is less than EXTSideOUT, and RSSI_4 is less than EXTRearOUT. If yes, the key is currently in the invalid area; otherwise, proceed to step (3.2); (3.2) Determine whether any of the conditions of RSSI_1 being less than INT1OUT or RSSI_2 being less than EXTOUT or RSSI_3 being less than EXTOUT is satisfied. If so, the key is in the effective area outside the vehicle, and proceed to step (3.3); otherwise, proceed to step (3.4); (3.3) Determine the location of the key outside the vehicle; (3.4) Determine whether RSSI_1 is greater than or equal to INT1Thread3. If so, the key is in the car; otherwise, continue to step (3.5); (3.5) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.6); (3.6) Determine whether RSSI_1 is greater than or equal to INT1OUT and RSSI_1 is less than INT1Thread2 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.7); (3.7) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread3 and RSSI_3 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.8); (3.8) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread3 and RSSI_2 is less than EXTThread4. If yes, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.9); (3.9) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_2 is greater than or equal to EXTOUT and RSSI_2 is less than EXTThread2 and RSSI_3 is greater than or equal to EXTThread4. If yes, the key is at a specific location outside the vehicle, and continue with step (3.3); otherwise, continue with step (3.10); (3.10) Determine whether RSSI_1 is greater than or equal to INT1Thread2 and RSSI_1 is less than INT1Thread3 and RSSI_3 is greater than or equal to EXTOUT and RSSI_3 is less than EXTThread2 and RSSI_2 is greater than or equal to EXTThread4. If so, the key is in the special identification area outside the vehicle, and continue with step (3.3); otherwise, continue with the key being in the vehicle.

7. The method for realizing vehicle key area positioning according to claim 6, characterized in that: The step (3.3) specifically comprises the following steps: (3.3.1) Determine whether RSSI_2 is greater than or equal to RSSI_3 and RSSI_2 is greater than or equal to RSSI_4. If so, the key is in the driver's side PE area; otherwise, continue to step (3.3.2); (3.3.2) Determine whether RSSI_3 is greater than or equal to RSSI_2 and RSSI_3 is greater than or equal to RSSI_4. If so, the key is in the PE area on the passenger side; otherwise, proceed to step (3.3.3); (3.3.3) Determine whether RSSI_4 is greater than or equal to RSSI_2 and RSSI_4 is greater than or equal to RSSI_3. If so, the key is in the tailgate PE area; otherwise, end the step.

8. A device for realizing vehicle key area positioning, characterized in that: The device comprises: a processor configured to execute computer executable instructions; A memory storing one or more computer executable instructions, wherein when the computer executable instructions are executed by the processor, each step of the method for locating a vehicle key area according to any one of claims 1 to 7 is implemented.

9. A processor for realizing vehicle key area positioning, characterized in that: The processor is configured to execute computer executable instructions. When the computer executable instructions are executed by the processor, the various steps of the method for locating a vehicle key area described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program can be executed by a processor to implement the various steps of the method for locating a vehicle key area according to any one of claims 1 to 7.

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