A vehicle searching method and system, and a vehicle

Abstract

The present invention provides a method for finding a vehicle, comprising: within the vehicle's orientation indication area, the vehicle-side Bluetooth antenna continuously receives a first Bluetooth signal emitted by a first Bluetooth module, the orientation indication area being an area greater than a first distance threshold from the vehicle; calculating the signal strength indication of the first Bluetooth signal, and the changing trend of the signal strength indication over time; determining the relative position of the first Bluetooth module and the vehicle according to the changing trend to determine the position of the vehicle. After adopting the above technical solution, the defect of Bluetooth signal instability at the far end can be effectively overcome; at the same time, with the help of a stable Bluetooth signal, the fuzzy positioning of the vehicle can be quickly realized so that the user can quickly find the vehicle; there is no need for the vehicle to make actions such as honking or flashing lights to remind the user of the current position of the vehicle, and there is no noise or light impact on the surrounding environment.

Description

Technical Field

[0001] The present invention relates to a vehicle, and in particular to a vehicle finding method and system, and a vehicle. Background Art

[0002] In the vehicle digital key system, the vehicle is usually the center, and the mobile phone is positioned within a radius of 10 to 15 meters using the RSSI of the vehicle-side Bluetooth antenna and the software positioning algorithm in the Bluetooth control module, thereby realizing functions such as keyless start and entry.

[0003] However, for car search scenarios including underground garages and indoor parking lots, existing vehicle digital keys usually only use the Bluetooth communication channel between the vehicle-side Bluetooth control module and the mobile phone to send RKE commands (remote vehicle control commands) to make the vehicle honk or flash lights, thereby achieving the purpose of notifying the owner of the vehicle's location. The disadvantage of this method of finding a car is that it cannot quickly and effectively find the car in a garage or parking lot with a complex environment, and it has a certain degree of noise impact on the surrounding environment.

[0004] On the other hand, some vehicles use mobile phones and vehicle cellular network communications to send remote vehicle control commands. This method cannot achieve the purpose of finding the vehicle in places such as underground garages where cellular network base station signals cannot be stably received. Summary of the invention

[0005] In order to overcome the above technical defects, the purpose of the present invention is to provide a vehicle finding method that can achieve fast and stable vehicle positioning without relying on cellular network communication, and can also achieve vehicle positioning in places where cellular network base station signals cannot be stably received.

[0006] Specifically, the present invention discloses a vehicle finding method, comprising: within a position indication area of ​​the vehicle, a vehicle-mounted Bluetooth antenna continuously receives a first Bluetooth signal transmitted by a first Bluetooth module, wherein the position indication area is an area greater than a first distance threshold from the vehicle; calculating a signal strength indication of the first Bluetooth signal, and a changing trend of the signal strength indication over time; determining the relative position of the first Bluetooth module and the vehicle according to the changing trend to determine the position of the vehicle.

[0007] Preferably, within the vehicle's direction indication area, the vehicle-mounted Bluetooth antenna continuously receives the first Bluetooth signal; calculates the signal indication strength RSSI0 of the first Bluetooth signal; calculates a first change curve of the signal strength indication RSSI0 changing with time, and obtains a second change curve after performing a first-order filtering process on the first change curve; calculates the slope of the second change curve, and when the slope is a positive number, the first Bluetooth module is close to the vehicle, and when the slope is a negative number, the first Bluetooth module is far away from the vehicle.

[0008] Preferably, within the vehicle's direction indication area, the plurality of vehicle-mounted Bluetooth antennas continuously receive the first Bluetooth signal; the plurality of vehicle-mounted Bluetooth antennas respectively calculate the first signal indication strength RSSI1 of the first Bluetooth signal; and the average value of the first signal indication strength RSSI1 is calculated as the signal indication strength RSSI0.

[0009] Preferably, the multiple vehicle-mounted Bluetooth antennas include a main Bluetooth antenna and n slave Bluetooth antennas, and the main Bluetooth antenna receives a first signal indication strength RSSI1 sent by the n slave Bluetooth antennas;

[0010] The main Bluetooth antenna calculates an average value of the first signal indication strength RSSI1 as signal indication strength RSSI0.

[0011] In the vehicle's position indication area, the main Bluetooth antenna establishes a Bluetooth connection with the first Bluetooth module;

[0012] The main Bluetooth antenna wakes up the n slave Bluetooth antennas to adjust the signal mode to the sniffing mode, and the main Bluetooth antenna and the n slave Bluetooth antennas continue to receive the first Bluetooth signal;

[0013] The n slave Bluetooth antennas respectively calculate a first signal indication strength RSSI1 of the first Bluetooth signal.

[0014] Preferably, when the slope is a positive number, the vehicle sends a first signal to the first Bluetooth module, and the first signal indicates that the vehicle is approaching;

[0015] When the slope is a negative number, the vehicle sends a second signal to the first Bluetooth module, and the second signal indicates that the vehicle is moving away from the vehicle;

[0016] When the slope is zero, the vehicle sends a third signal to the first Bluetooth module, and the third signal indicates that the first Bluetooth module needs to adjust its direction.

[0017] Preferably, within the area indication zone of the vehicle, the vehicle continuously receives the second Bluetooth signal transmitted by the first Bluetooth module, and locates the first Bluetooth module according to the second Bluetooth signal, and the area indication zone is an area whose distance from the vehicle is not greater than the first distance threshold.

[0018] Preferably, the direction indication area is an area whose distance from the vehicle is greater than a first distance threshold and less than a second distance threshold; the second distance threshold is the farthest coverage distance of the first Bluetooth signal.

[0019] Another aspect of the present invention provides a vehicle finding system, which applies any of the vehicle finding methods described above.

[0020] Another aspect of the present invention provides a vehicle, comprising the vehicle finding system as described above.

[0021] After adopting the above technical solution, compared with the prior art, the technical solution in the present invention can effectively overcome the defect of unstable Bluetooth signal at the remote end; at the same time, with the help of stable Bluetooth signal, the fuzzy positioning of the vehicle can be quickly realized, so that the user can quickly find the vehicle. In addition, there is no need for the vehicle to make actions such as honking or flashing lights to remind the user of the current location of the vehicle, and there is no noise or light impact on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a process flow of a vehicle search method according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the position indication area in the embodiment;

[0024] Figure 3 A schematic diagram of a change curve of the signal indication strength before and after processing in another embodiment;

[0025] Figure 4 A schematic diagram of a flow chart of a vehicle-finding method in another embodiment of the present invention;

[0026] Figure 5 Schematic diagram of a vehicle finding system in one embodiment of the present invention. DETAILED DESCRIPTION

[0027] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0029] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0030] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0031] Figure 1 The flowchart of the vehicle search method in one embodiment of the present invention specifically includes: within the vehicle's position indication area, the vehicle continuously receives a first Bluetooth signal transmitted by a first Bluetooth module, the position indication area being an area with a distance from the vehicle greater than a first distance threshold; calculating a signal strength indication of the first Bluetooth signal, and a change trend of the signal strength indication over time; determining the relative position of the first Bluetooth module and the vehicle according to the change trend, so as to determine the position of the vehicle.

[0032] In this embodiment, the vehicle position indication area is divided according to the distance range, such as Figure 2 As shown, it is a schematic diagram of the position indication area in this embodiment. In this embodiment, the position indication area is an area greater than the first distance threshold and less than the second distance threshold from the vehicle; the second distance threshold is the farthest coverage distance of the first Bluetooth signal. The first distance threshold is 15 meters and the second distance threshold is 80 meters. In the area 15-80 meters away from the vehicle, the vehicle search method in this embodiment is used to indicate the position of the user holding the first Bluetooth module according to the change trend of the signal indication strength of the Bluetooth signal over time. The area indication area in the figure is an area not greater than the first distance threshold from the vehicle. In this area, the vehicle continuously receives the second Bluetooth signal transmitted by the first Bluetooth module, and locates the first Bluetooth module according to the second Bluetooth signal. Since the distance between the vehicle and the first Bluetooth module is relatively close in this area, the Bluetooth signal is also relatively stable, and the first Bluetooth module can be directly located by the Bluetooth signal. In this area, the relative distance between the vehicle and the first Bluetooth module can also be calculated using common algorithms in this field, such as multilateral weight positioning.

[0033] It should be noted that the first Bluetooth module in the present invention can be a user's smart terminal, such as a Bluetooth module that comes with a smart phone, or a Bluetooth module installed on a vehicle key, and the present invention is not limited here. The first threshold distance and the second threshold distance can also be other values, wherein the area less than the first threshold distance from the vehicle is the area indication area, which is usually the vehicle's welcome area or automatic unlocking area, and no longer requires a direction indication. Therefore, the specific value of the first threshold distance can be determined based on the farthest distance of the vehicle's welcome area, and the specific value of the second threshold distance can be based on the farthest distance that the Bluetooth signal can be transmitted, or the distance of a stable signal that can be detected. The present invention does not limit the specific values ​​of the first threshold distance and the second threshold distance.

[0034] Compared to the prior art, in which RKE is sent to the vehicle to make the vehicle honk or flash lights to remind the user of the vehicle's location, the vehicle search method in this embodiment does not require the vehicle to make any sound or light, will not affect the surrounding environment, and will not miss the vehicle's horn sound and flashing light due to noisy environment.

[0035] At the same time, due to the multipath effect of electromagnetic waves, Bluetooth signals are usually unstable at the far end, which may cause the signal strength indication of the first Bluetooth signal to change with time to be unstable, so the relative position information between the first Bluetooth module and the vehicle received by the user is unstable and jumps. In one embodiment of the present invention, the vehicle search method further includes:

[0036] In the vehicle's direction indication area, the vehicle-mounted Bluetooth antenna continuously receives the first Bluetooth signal; calculates the signal indication strength RSSI0 of the first Bluetooth signal; calculates a first change curve of the signal strength indication RSSI0 changing with time, and obtains a second change curve after performing a first-order filtering process on the first change curve; calculates the slope of the second change curve, and when the slope is a positive number, the first Bluetooth module is close to the vehicle, and when the slope is a negative number, the first Bluetooth module is far away from the vehicle.

[0037] That is, in this embodiment, if Figure 3 The figure shows a schematic diagram of the first change curve and the second change curve before and after the first-order filtering process. It can be seen from the figure that by performing the first-order filtering process on the first change curve, a second change curve with a smoother change trend is obtained. The change trend is determined according to the processed second change curve, thereby determining the relative position relationship between the first Bluetooth module and the vehicle.

[0038] Vehicles are usually equipped with multiple Bluetooth antennas located at different positions of the vehicle to sense environmental information around the vehicle. Therefore, in another embodiment, multiple vehicle-mounted Bluetooth antennas continuously receive the first Bluetooth signal in the orientation indication area; multiple vehicle-mounted Bluetooth antennas respectively calculate the first signal indication strength RSSI1 of the first Bluetooth signal; and the average value of the first signal indication strength RSSI1 is calculated as the signal indication strength RSSI0. In actual use, unstable Bluetooth connection may cause frame loss. If a single Bluetooth antenna is used to receive the first Bluetooth signal, data will be missing. In this embodiment, multiple vehicle-mounted Bluetooth antennas are used to avoid this situation. Even if a Bluetooth antenna loses a frame, other Bluetooth antennas can still provide valid data.

[0039] In another embodiment, the multiple vehicle-mounted Bluetooth antennas include a main Bluetooth antenna and n slave Bluetooth antennas, the main Bluetooth antenna receives the first signal indication strength RSSI1 sent by the n slave Bluetooth antennas; the main Bluetooth antenna calculates the average value of the first signal indication strength RSSI1 as the signal indication strength RSSI0.

[0040] In another embodiment of the present invention, Figure 4 As shown, within the vehicle's direction indication area, the main Bluetooth antenna establishes a Bluetooth connection with the first Bluetooth module; the main Bluetooth antenna wakes up the n slave Bluetooth antennas to adjust the signal mode to the sniffing mode, and the main Bluetooth antenna and the n slave Bluetooth antennas continue to receive the first Bluetooth signal; the n slave Bluetooth antennas respectively calculate the first signal indication strength RSSI1 of the first Bluetooth signal.

[0041] In this embodiment, the main Bluetooth antenna is the vehicle's on-board Bluetooth control module, which is used to establish a Bluetooth connection with the first Bluetooth module and wake up the slave Bluetooth antenna to adjust the signal mode after receiving the first Bluetooth signal; and is used to receive the first signal indication strength RSSI1 sent by other slave Bluetooth antennas, calculate the average value of the first signal indication strength RSSI1 of other slave Bluetooth antennas and the main Bluetooth antenna, and calculate the slope of the second change curve obtained after first-order filtering.

[0042] In this embodiment, when the slope of the second change curve calculated by the main Bluetooth antenna is a positive number, it indicates that the first Bluetooth module is approaching the vehicle, and the vehicle sends a first signal to the first Bluetooth module, and the first signal indicates that the vehicle is approaching; similarly, when the slope is a negative number, the vehicle sends a second signal to the first Bluetooth module, and the second signal indicates that the vehicle is moving away from the vehicle; when the slope is zero, the vehicle sends a third signal to the first Bluetooth module, and the third signal indicates that the first Bluetooth module, i.e., the user's mobile phone, needs to adjust its direction.

[0043] In this embodiment, on the one hand, the first signal indication strength RSSI1 of the first Bluetooth signal received by multiple slave Bluetooth antennas and the main Bluetooth antenna installed in the vehicle is collected, and the first signal indication strength RSSI1 is averaged; at the same time, the first change curve of the signal strength indication RSSI0 changing with time is first-order filtered to make the first change curve closer to a smooth curve. This improves the instability of the Bluetooth signal at the far end, so as to obtain more stable location information. The user can achieve fuzzy positioning of the vehicle in the area indication area by relying on information such as "close", "far away", and "adjustment method".

[0044] In another embodiment of the present invention, a vehicle finding system is provided, which uses the vehicle finding method as described above. Figure 5 As shown, it includes a vehicle-mounted Bluetooth module, including a main Bluetooth antenna and 4 slave Bluetooth antennas, and the 4 slave Bluetooth antennas are respectively arranged at different positions of the vehicle; a main Bluetooth antenna and 4 slave Bluetooth antennas are used to receive the first Bluetooth signal of the first Bluetooth module on the mobile phone end, and calculate the first signal strength indication of the first Bluetooth signal, the main Bluetooth antenna is used to receive the first signal strength indication calculated by the 4 slave Bluetooth antennas, and calculate the average value of the first signal strength indication calculated by the 5 Bluetooth antennas including the main Bluetooth antenna, and the first change curve of the signal strength indication changing with time, and obtain the second change curve after a filtering process; the main Bluetooth antenna is further used to calculate the slope of the second change curve, when the slope is a positive number, the mobile phone is close to the vehicle, and the mobile phone displays information representing "close"; when the slope is a negative number, the mobile phone is far away from the vehicle, and the mobile phone displays information representing "far away"; when the slope is 0, the mobile phone needs to adjust the direction, and the mobile phone displays information representing "adjust direction". It can be understood that the mobile phone can display the above relative position information through the mobile phone application, and can also display the above position information through other display methods.

[0045] Another embodiment of the present invention provides a vehicle, comprising the above-mentioned vehicle finding system. The technical features of the vehicle finding system are similar to those of the above-mentioned vehicle finding method, and the present invention will not be described in detail here.

[0046] The vehicle search method of the present invention does not use the cellular network to transmit signals, thus avoiding the situation where the signal cannot be sent stably in the scenario where the cellular communication signal is unstable. At the same time, the relative distance between the user and the vehicle is determined by using the change trend of the Bluetooth signal indication strength over time in the azimuth indication area far from the vehicle, and further using a first-order filtering method and a method of calculating the average signal indication strength of the signals received by multiple Bluetooth antennas to reduce the interference of external factors and the instability of the Bluetooth signal at the far end, thereby obtaining stable and accurate positioning information. The vehicle search method of the present invention can be combined with the Bluetooth signal positioning method in the prior art, so that users can quickly and conveniently find vehicles.

[0047] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for finding a vehicle, characterized in that: include: In a position indication area of ​​the vehicle, the vehicle-mounted Bluetooth antenna continuously receives a first Bluetooth signal transmitted by a first Bluetooth module, wherein the position indication area is an area that is greater than a first distance threshold from the vehicle; Calculating a signal strength indicator of the first Bluetooth signal and a changing trend of the signal strength indicator over time; The relative position of the first Bluetooth module and the vehicle is determined according to the change trend to determine the position of the vehicle.

2. The vehicle searching method according to claim 1, characterized in that: In the vehicle's direction indication area, the vehicle-mounted Bluetooth antenna continuously receives the first Bluetooth signal; Calculate the signal indication strength RSSI0 of the first Bluetooth signal; Calculating a first variation curve of the signal strength indication RSSI0 varying with time, and obtaining a second variation curve after performing a first-order filtering process on the first variation curve; The slope of the second change curve is calculated. When the slope is a positive number, the first Bluetooth module is close to the vehicle. When the slope is a negative number, the first Bluetooth module is far away from the vehicle.

3. The vehicle searching method according to claim 2, characterized in that: In the direction indication area, the plurality of vehicle-mounted Bluetooth antennas continuously receive the first Bluetooth signal; The plurality of vehicle-mounted Bluetooth antennas respectively calculate a first signal indication strength RSSI1 of the first Bluetooth signal; The average value of the first signal indication strength RSSI1 is calculated as the signal indication strength RSSI0.

4. The vehicle searching method according to claim 3, characterized in that: The multiple vehicle-mounted Bluetooth antennas include a main Bluetooth antenna and n slave Bluetooth antennas, and the main Bluetooth antenna receives a first signal indication strength RSSI1 sent by the n slave Bluetooth antennas; The main Bluetooth antenna calculates an average value of the first signal indication strength RSSI1 as signal indication strength RSSI0.

5. The vehicle searching method according to claim 4, characterized in that: In the vehicle's position indication area, the main Bluetooth antenna establishes a Bluetooth connection with the first Bluetooth module; The main Bluetooth antenna wakes up the n slave Bluetooth antennas to adjust the signal mode to the sniffing mode, and the main Bluetooth antenna and the n slave Bluetooth antennas continue to receive the first Bluetooth signal; The n slave Bluetooth antennas respectively calculate a first signal indication strength RSSI1 of the first Bluetooth signal.

6. The vehicle searching method according to any one of claims 1 to 5, characterized in that: When the slope is a positive number, the vehicle sends a first signal to the first Bluetooth module, and the first signal indicates that the vehicle is approaching; When the slope is a negative number, the vehicle sends a second signal to the first Bluetooth module, and the second signal indicates that the vehicle is moving away from the vehicle; When the slope is zero, the vehicle sends a third signal to the first Bluetooth module, and the third signal indicates that the first Bluetooth module needs to adjust its direction.

7. The vehicle searching method according to claim 6, characterized in that: In the area indicating area of ​​the vehicle, the vehicle continuously receives the second Bluetooth signal transmitted by the first Bluetooth module and locates the first Bluetooth module according to the second Bluetooth signal. The area indicating area is an area whose distance from the vehicle is not greater than the first distance threshold.

8. The vehicle searching method according to claim 7, characterized in that: The direction indication area is an area that is greater than a first distance threshold and less than a second distance threshold from the vehicle; The second distance threshold is the farthest coverage distance of the first Bluetooth signal.

9. A vehicle finding system, characterized in that: Apply the vehicle finding method as described in any one of claims 1-8.

10. A vehicle, characterized in that: It comprises the vehicle finding system as claimed in claim 9.

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