Vehicle-mounted OBD locator and positioning method based on Beidou positioning chip

Abstract

The present invention discloses a vehicle-mounted OBD locator and a positioning method based on a Beidou positioning chip, relates to the technical field of vehicle-mounted OBD locators, and includes an OBD connector, a main positioning unit, and a secondary positioning unit. The present invention adopts an OBD connector and a vehicle-mounted OBD interface to realize communication connection, and adopts the setting of two sets of positioning units. When the positioning signal of the main positioning unit still fails to meet the requirements after adjustment, the secondary positioning units installed at different positions provide positioning signals, so that normal positioning under some abnormal interference conditions can be achieved; the signal adjustment of the main positioning unit is based on the positioning chip moving mechanism, and the change of the positioning signal is monitored during the movement process, so that the positioning signal can be improved, and the moving part of the positioning chip moving mechanism is controlled to be in a position where the positioning signal is improved, so that the positioning interference sources at some specific positions can be physically avoided, and higher-precision satellite positioning can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted OBD locators, and in particular to a vehicle-mounted OBD locator and a positioning method based on a Beidou positioning chip. Background Art

[0002] The vehicle OBD locator is a vehicle anti-theft tracking device that can locate the vehicle through the OBD interface locator. The OBD interface locator is a plug-and-play locator that does not require complicated installation steps. Just plug it into the car's OBD interface. The OBD interface location of various models may be different, but the installation is very simple. Just draw power directly from the car's OBD interface. No wiring is required, and no regular charging is required. You can use it after plugging it in.

[0003] The car OBD interface can detect the engine electronic control system during the operation of the car, as well as the working conditions of other functional modules of the vehicle. By connecting to the computer, we can view the car data, detect car faults, and perform car repairs, function development, equipment modification and other operations. In addition, inserting the anti-theft locator into the car OBD can realize the function of tracking and locating the vehicle.

[0004] At present, the existing vehicle-mounted locators have the following disadvantages: they rely on GPS signals, and the car's OBD interface happens to be located below the steering wheel of the driver's seat. Therefore, the positioning accuracy is greatly affected by the environment when it is working, and the communication module has high power consumption. When the car is parked, it will continue to consume the battery power, affecting the battery life of the vehicle. The data processing speed is slow, the real-time performance is poor, the anti-interference ability is weak, and it is easily interfered by other signals. Summary of the invention

[0005] In order to solve the technical problems of the existing vehicle-mounted OBD locator, the present invention provides a vehicle-mounted OBD locator and a positioning method based on a Beidou positioning chip. The following technical solutions are adopted:

[0006] The vehicle-mounted OBD locator based on Beidou positioning chip comprises an OBD connector, a main positioning unit and a secondary positioning unit, wherein the OBD connector is connected to the vehicle-mounted OBD interface, the main positioning unit comprises a positioning chip moving mechanism, a positioning signal circuit board based on the positioning chip and a positioning unit controller, the positioning chip moving mechanism is installed at a fixed position in the vehicle, the positioning signal circuit board is installed at the moving part of the positioning chip moving mechanism and moves with the moving part, the positioning unit controller is integrated at the positioning signal circuit board and is communicatively connected with the positioning signal circuit board, the execution action of the positioning chip moving mechanism is controlled based on the strength of the positioning signal, the moving part of the positioning chip moving mechanism drives the positioning signal circuit board to move the position to improve the positioning signal, the secondary positioning unit has the same structure as the main positioning unit, and the installation position is set at a distance from the center point of the positioning chip moving mechanism.

[0007] By adopting the above technical solution, the OBD connector is used to realize the communication connection with the vehicle-mounted OBD interface, and the positioning signal is exchanged with the vehicle computer. Two sets of positioning units are set. The auxiliary positioning unit has the same structure as the main positioning unit, and the installation position is set at a distance from the center point of the positioning chip moving mechanism. When the positioning signal of the main positioning unit still does not meet the requirements after adjustment, the auxiliary positioning unit installed at different positions provides the positioning signal, so that normal positioning can be achieved under some abnormal interference conditions.

[0008] Usually, the secondary positioning unit and the main positioning unit are installed at different positions in the car. For example, the main positioning unit is located on the inner wall of the main driving seat, and the secondary positioning unit is located in the trunk. Communication interaction is achieved through a communication line.

[0009] The signal adjustment of the main positioning unit is implemented based on the positioning chip moving mechanism. For example, in the initial working state, the moving part of the positioning chip moving mechanism is in the original position. At this time, the positioning signal circuit board can analyze the positioning signal strength. If the analyzed positioning signal strength is lower than the set positioning signal threshold, it is considered that the current position of the positioning signal circuit board based on the positioning chip may be subject to directional interference or other influences, resulting in a weak positioning signal. By controlling the movement of the moving part of the positioning chip moving mechanism, the positioning signal circuit board is driven to move, and the changes in the positioning signal are monitored during the movement. If the positioning signal can be improved during the movement of the moving part of the positioning chip moving mechanism from the initial position to the maximum stroke, then the moving part of the positioning chip moving mechanism is controlled to be in a position where the positioning signal is improved, thereby physically avoiding positioning interference sources at some specific locations and achieving higher-precision satellite positioning.

[0010] Optionally, the positioning chip moving mechanism is a DC reciprocating electric push rod, and the positioning signal circuit board is installed at the end of the telescopic rod of the DC reciprocating electric push rod. When the telescopic rod of the DC reciprocating electric push rod is extended, the positioning signal circuit board is driven to move between an initial position and a maximum stroke. The positioning unit controller controls the telescopic rod of the positioning chip moving mechanism to extend a set distance each time, records the positioning signal strength of the positioning signal circuit board, obtains the position with the maximum signal strength, and controls the telescopic rod of the positioning chip moving mechanism to remain at the position with the maximum signal strength.

[0011] By adopting the above technical solution, the positioning chip moving mechanism adopts a DC reciprocating electric push rod, and a DC reciprocating electric push rod with a miniature size is selected as much as possible, with a stroke of one hundred millimeters. The adjustment distance can be set to ten millimeters or twenty millimeters each time. After each adjustment, the positioning signal circuit board will feedback a positioning signal strength, and finally the position with the largest positioning signal strength can be selected for locking.

[0012] Sufficient space should be reserved for the telescopic rod direction of the miniature DC reciprocating electric push rod at the installation position to achieve extension and retraction. For example, it can be installed on the side of the inner wall of the driving position. When the telescopic rod of the DC reciprocating electric push rod is extended or retracted, the position of the positioning signal circuit board can be changed, thereby realizing the change of the positioning signal.

[0013] Optionally, the positioning signal circuit board includes a circuit substrate and a positioning chip, wherein the circuit substrate is fixedly mounted on the end of a telescopic rod of the positioning chip moving mechanism, and the positioning chip is integrated on the circuit substrate for sending and receiving positioning signals.

[0014] Optionally, the positioning chip is a Beidou positioning chip.

[0015] By adopting the above technical solution, it is necessary to select a Beidou positioning chip that supports outputting signal strength information.

[0016] Optionally, the positioning unit controller includes a positioning signal buffer, a data analysis chip and a control chip. The positioning signal buffer is communicated with the positioning chip based on the NMEA protocol to collect NMEA data. The data analysis chip is communicated with the positioning signal buffer. The data analysis chip parses the NMEA sentences received from the positioning chip to extract signal strength information and feeds back the signal strength information to the control chip. The control chip controls the execution action of the positioning chip moving mechanism according to the signal strength information.

[0017] By adopting the above technical solution, the positioning unit controller has two functions: one is that the data analysis chip analyzes the changes in the positioning signal strength of the positioning chip, and the other is that the control chip controls the execution action of the positioning chip moving mechanism based on the positioning signal strength analysis results.

[0018] Many BeiDou chips support the NMEA (National Marine Electronics Association) protocol, which is a standard data communication protocol. Signal strength information is usually included in certain NMEA sentences, such as GPGSV (GPSSatellites in View) or BDGSV (BeiDou Satellites in View).

[0019] The data analysis chip parses the NMEA sentences or responses to specific commands received from the Beidou chip and extracts signal strength information.

[0020] Optionally, the installation position of the center point of the positioning chip moving mechanism of the auxiliary positioning unit is at least one meter away from the center point of the positioning chip moving mechanism of the main positioning unit, and the positioning unit controller controls the working states of the main positioning unit and the auxiliary positioning unit.

[0021] By adopting the above technical solution, the auxiliary positioning unit and the main positioning unit are installed separately in physical distance, preferably in different areas, such as the main driving seat and the trunk.

[0022] Optionally, it also includes a power supply unit, which supplies power to the main positioning unit and at least one auxiliary positioning unit respectively.

[0023] Optionally, the power supply unit includes a small lithium battery and a charging module, wherein the small lithium battery supplies power to the main positioning unit and the auxiliary positioning unit respectively, and when the car is in a moving state, the charging module charges the small lithium battery through the OBD connector.

[0024] By adopting the above technical solution and using a separate power supply unit, a small lithium battery can support the positioning of various electrical components when the car is parked. When the car is in a moving state, the charging module charges the small lithium battery through the OBD connector to supplement the battery life.

[0025] The vehicle-mounted positioning method based on Beidou positioning chip adopts the vehicle-mounted OBD locator based on Beidou positioning chip for positioning, and includes the following steps:

[0026] In the default state, the positioning unit controller controls the main positioning unit to be in working state and the auxiliary positioning unit to be in standby state;

[0027] Every ten seconds, the data analysis chip parses the NMEA sentence received from the positioning chip to extract the positioning signal strength information, and compares it with the positioning signal strength threshold. If it is less than the positioning signal strength threshold, a signal indicating that the positioning signal strength is weak is fed back to the control chip, and the control chip controls the telescopic rod of the positioning chip moving mechanism to extend 10 mm. The data analysis chip parses the signal strength information again, and the control chip controls the positioning chip moving mechanism to repeat the action multiple times until the maximum stroke is reached. The positioning signal strength information after multiple actions is compared respectively, and the position with the maximum positioning signal strength is taken as the adjustment working position. The control chip controls the telescopic rod of the positioning chip moving mechanism to work at the adjustment working position;

[0028] When the vehicle computer requests an interactive positioning signal from the on-board OBD locator, the positioning chip receives the positioning signal from the Beidou satellite, processes it, and transmits it to the vehicle computer through the OBD connector to achieve high-precision positioning of the Beidou satellite.

[0029] Optionally, if the multiple positioning signal strengths obtained after the control chip controls the positioning chip moving mechanism to repeat the action multiple times are all lower than the positioning signal strength threshold, the positioning unit controller controls the main positioning unit to be in a standby state and the auxiliary positioning unit to be in a working state;

[0030] If the positioning chip moving mechanism of the auxiliary positioning unit is in the initial state, and the positioning signal strength obtained by the data analysis chip of the auxiliary positioning unit is greater than the positioning signal strength threshold, the positioning chip of the auxiliary positioning unit receives the positioning signal of the Beidou satellite and transmits it to the vehicle computer through the OBD connector after processing.

[0031] In summary, the present invention includes at least one of the following beneficial technical effects:

[0032] The present invention can provide a vehicle-mounted OBD locator and a positioning method based on a Beidou positioning chip, adopt an OBD connector and a vehicle-mounted OBD interface to achieve communication connection, adopt the setting of two sets of positioning units, the auxiliary positioning unit has the same structure as the main positioning unit, and the installation position is set at a distance from the center point of the positioning chip moving mechanism. When the positioning signal of the main positioning unit still fails to meet the requirements after adjustment, the positioning signal is provided by the auxiliary positioning unit installed at different positions, so that normal positioning can be achieved under some abnormal interference conditions;

[0033] The signal adjustment of the main positioning unit is realized based on the positioning chip moving mechanism. In the initial working state, the moving part of the positioning chip moving mechanism is in the original position, and the positioning signal circuit board analyzes the positioning signal strength. If the analyzed positioning signal strength is lower than the set positioning signal threshold, it is considered that the current position of the positioning signal circuit board based on the positioning chip may be subject to directional interference or other influences, resulting in a weak positioning signal. The positioning signal circuit board is driven to move by controlling the moving part of the positioning chip moving mechanism, and the changes in the positioning signal are monitored during the movement. If the positioning signal can be improved during the process of the moving part of the positioning chip moving mechanism moving from the initial position to the maximum stroke, the moving part of the positioning chip moving mechanism is controlled to be in a position where the positioning signal is improved, thereby physically avoiding positioning interference sources at some specific positions and achieving higher-precision satellite positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the component connection principle of the vehicle-mounted OBD locator based on the Beidou positioning chip of the present invention;

[0035] Figure 2 This is a schematic diagram of the connection principle of the main positioning unit components of the vehicle-mounted OBD locator based on the Beidou positioning chip of the present invention;

[0036] Figure 3 It is a schematic diagram of the installation method of the main positioning unit of the vehicle-mounted OBD locator based on the Beidou positioning chip of the present invention.

[0037] Explanation of the accompanying drawings: 1. OBD connector; 2. Main positioning unit; 21. Positioning chip moving mechanism; 22. Positioning signal circuit board; 221. Circuit substrate; 222. Positioning chip; 23. Positioning unit controller; 231. Positioning signal buffer; 232. Data analysis chip; 233. Control chip; 3. Auxiliary positioning unit; 4. Power supply unit; 41. Small lithium battery; 42. Charging module; 100. Vehicle-mounted OBD interface; 101. Vehicle computer. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] The embodiment of the present invention discloses a vehicle-mounted OBD locator and a positioning method based on a Beidou positioning chip.

[0040] Reference Figure 1-Figure 3 Embodiment 1, a vehicle-mounted OBD locator based on Beidou positioning chip, includes an OBD connector 1, a main positioning unit 2 and a secondary positioning unit 3, the OBD connector 1 is connected to the vehicle-mounted OBD interface 100, the main positioning unit 2 includes a positioning chip moving mechanism 21, a positioning signal circuit board 22 based on the positioning chip and a positioning unit controller 23, the positioning chip moving mechanism 21 is installed at a fixed position in the vehicle, the positioning signal circuit board 22 is installed in the moving part of the positioning chip moving mechanism 21, and moves with the moving part, the positioning unit controller 23 is integrated at the positioning signal circuit board 22, and is communicatively connected with the positioning signal circuit board 22, the execution action of the positioning chip moving mechanism 21 is controlled based on the strength of the positioning signal, the moving part of the positioning chip moving mechanism 21 drives the positioning signal circuit board 22 to move the position to improve the positioning signal, the secondary positioning unit 3 has the same structure as the main positioning unit 2, and the installation position is set at a distance from the center point of the positioning chip moving mechanism 21.

[0041] The OBD connector 1 is used to realize communication connection with the vehicle-mounted OBD interface 100, and realizes the interactive positioning signal with the vehicle computer 101. Two sets of positioning units are set. The auxiliary positioning unit 3 has the same structure as the main positioning unit 2, and the installation position is set at a distance from the center point of the positioning chip moving mechanism 21. When the positioning signal of the main positioning unit 2 still does not meet the requirements after adjustment, the auxiliary positioning unit 3 installed at different positions provides a positioning signal, so that normal positioning can be achieved under some abnormal interference conditions;

[0042] Usually, the secondary positioning unit 3 and the main positioning unit 2 are installed at different positions in the car. For example, the main positioning unit 2 is located on the inner wall of the main driving seat, and the secondary positioning unit 3 is located in the trunk, and communication interaction is achieved through a communication line;

[0043] The signal adjustment of the main positioning unit 2 is implemented based on the positioning chip moving mechanism 21. For example, in the initial working state, the moving part of the positioning chip moving mechanism 21 is in the original position. At this time, the positioning signal circuit board 22 can analyze the positioning signal strength. If the analyzed positioning signal strength is lower than the set positioning signal threshold, it is considered that the current position of the positioning signal circuit board 22 based on the positioning chip may be affected by directional interference or other influences, resulting in a weak positioning signal. By controlling the moving part of the positioning chip moving mechanism 21 to move, the positioning signal circuit board 22 is driven to move, and the changes in the positioning signal are monitored during the movement. If the positioning signal can be improved during the process of the moving part of the positioning chip moving mechanism 21 from the initial position to the maximum stroke, then the moving part of the positioning chip moving mechanism 21 is controlled to be in a position where the positioning signal is improved, so that the positioning interference sources at some specific positions can be physically avoided to achieve higher-precision satellite positioning.

[0044] The positioning chip moving mechanism 21 is a DC reciprocating electric push rod, and the positioning signal circuit board 22 is installed at the end of the telescopic rod of the DC reciprocating electric push rod. When the telescopic rod of the DC reciprocating electric push rod is extended, the positioning signal circuit board 22 is driven to move between the initial position and the maximum stroke. The positioning unit controller 23 controls the telescopic rod of the positioning chip moving mechanism 21 to extend a set distance each time, records the positioning signal strength of the positioning signal circuit board 22, obtains the position with the maximum signal strength, and controls the telescopic rod of the positioning chip moving mechanism 21 to remain at the position with the maximum signal strength.

[0045] The positioning chip moving mechanism 21 adopts a DC reciprocating electric push rod. Try to choose a DC reciprocating electric push rod with a miniature size, with a stroke of one hundred millimeters. The adjustment distance can be set to ten millimeters or twenty millimeters each time. After each adjustment, the positioning signal circuit board 22 will feedback a positioning signal strength, and finally select the position with the largest positioning signal strength to lock.

[0046] Sufficient space should be reserved for the telescopic rod direction of the miniature DC reciprocating electric push rod at the installation position to achieve telescopic, for example, it can be installed on the side of the inner wall of the driving position. When the telescopic rod of the DC reciprocating electric push rod is extended or retracted, the position of the positioning signal circuit board 22 can be changed, thereby realizing the change of the positioning signal.

[0047] The positioning signal circuit board 22 includes a circuit substrate 221 and a positioning chip 222 . The circuit substrate 221 is fixedly mounted on the end of the telescopic rod of the positioning chip moving mechanism 21 . The positioning chip 222 is integrated on the circuit substrate 221 for sending and receiving positioning signals.

[0048] The positioning chip 222 is a Beidou positioning chip.

[0049] You need to choose a Beidou positioning chip that supports outputting signal strength information.

[0050] The positioning unit controller 23 includes a positioning signal buffer 231, a data analysis chip 232 and a control chip 233. The positioning signal buffer 231 is connected to the positioning chip 222 for communication based on the NMEA protocol to collect NMEA data. The data analysis chip 232 is connected to the positioning signal buffer 231 for communication. The data analysis chip 232 parses the NMEA sentences received from the positioning chip 222 to extract signal strength information, and feeds back the signal strength information to the control chip 233. The control chip 233 controls the execution action of the positioning chip moving mechanism 21 according to the signal strength information.

[0051] The positioning unit controller 23 has two functions. First, the data analysis chip 232 analyzes the change of the positioning signal strength of the positioning chip 222. Second, the control chip 233 controls the execution action of the positioning chip moving mechanism 21 based on the positioning signal strength analysis result.

[0052] Many BeiDou chips support the NMEA (National Marine Electronics Association) protocol, which is a standard data communication protocol. Signal strength information is usually included in certain NMEA sentences, such as GPGSV (GPSSatellites in View) or BDGSV (BeiDou Satellites in View).

[0053] The following is an example procedure based on the NMEA protocol:

[0054] Step 1: Configure the Beidou chip to output NMEA data

[0055] Make sure the BeiDou chip is configured to output NMEA sentences that contain signal strength information. For example, the GPGSV sentence provides information about visible satellites, including their signal strength (C / No, i.e. carrier-to-noise density ratio).

[0056] Step 2: Read NMEA Data

[0057] Read the NMEA data stream output by the Beidou chip through the serial port. The following is an example of a GPGSV sentence:

[0058] $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74;

[0059] In this example, 03,03,111 indicates the third satellite and the signal strength is 111 (in dBHz).

[0060] Step 3: Parsing NMEA sentences:

[0061] Write code to parse NMEA sentences and extract signal strength information. The following is a simplified parsing process:

[0062] def parse_gpgsv(nmea_sentence):

[0063] parts=nmea_sentence.split(',')

[0064] num_sentences = int(parts[1])

[0065] sentence_number=int(parts[2])

[0066] satellites_in_view=int(parts[3])

[0067] signal_strengths=[]

[0068] #Each satellite's information occupies 4 elements, starting from the 4th element

[0069] for iin range(4,len(parts)-3,4):

[0070] satellite_id = int(parts[i])

[0071] elevation = int(parts[i+1])

[0072] azimuth = int(parts[i+2])

[0073] signal_strength = int(parts[i+3]) # C / No (signal strength)

[0074] signal_strengths.append((satellite_id,signal_strength))

[0075] return signal_strengths

[0076] # Example NMEA sentences

[0077] nmea_sentence="$GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74"

[0078] signal_strengths=parse_gpgsv(nmea_sentence)

[0079] print(signal_strengths);

[0080] Different Beidou chips and modules may have different output formats and command sets, so for specific implementation details, you need to refer to the official documentation and data manual of the Beidou chip you are using.

[0081] The data analysis chip 232 parses the NMEA sentences or responses to specific commands received from the Beidou chip 222 and extracts signal strength information.

[0082] The center point of the positioning chip moving mechanism 21 of the auxiliary positioning unit 3 is installed at a position at least one meter away from the center point of the positioning chip moving mechanism 21 of the main positioning unit 2 . The positioning unit controller 23 controls the working states of the main positioning unit 2 and the auxiliary positioning unit 3 .

[0083] The secondary positioning unit 3 is installed physically apart from the primary positioning unit 2, preferably in different areas, such as the main driving seat and the trunk.

[0084] It also includes a power supply unit 4, which supplies power to the main positioning unit 2 and at least one auxiliary positioning unit 3 respectively.

[0085] The power supply unit 4 includes a small lithium battery 41 and a charging module 42 . The small lithium battery 41 supplies power to the main positioning unit 2 and the auxiliary positioning unit 3 , respectively. When the vehicle is in a moving state, the charging module 42 charges the small lithium battery 41 through the OBD connector 1 .

[0086] By using a separate power supply unit 4, a small lithium battery 41 can support the positioning of various electrical components when the car is parked. When the car is in a moving state, the charging module 42 charges the small lithium battery 41 through the OBD connector 1 to supplement the battery life.

[0087] The vehicle-mounted positioning method based on Beidou positioning chip adopts the vehicle-mounted OBD locator based on Beidou positioning chip for positioning, and includes the following steps:

[0088] In the default state, the positioning unit controller 23 controls the main positioning unit 2 to be in the working state and the auxiliary positioning unit 3 to be in the standby state;

[0089] Every ten seconds, the data analysis chip 232 parses the NMEA sentence received from the positioning chip 222 to extract the positioning signal strength information, and compares it with the positioning signal strength threshold. If it is less than the positioning signal strength threshold, a signal indicating that the positioning signal strength is weak is fed back to the control chip 233. The control chip 233 controls the telescopic rod of the positioning chip moving mechanism 21 to extend 10 mm. The data analysis chip 232 parses the signal strength information again. The control chip 233 controls the positioning chip moving mechanism 21 to repeat the action multiple times until the maximum stroke is reached. The positioning signal strength information after multiple actions is compared respectively. The position with the maximum positioning signal strength is taken as the adjustment working position. The control chip 233 controls the telescopic rod of the positioning chip moving mechanism 21 to work at the adjustment working position.

[0090] When the vehicle computer 101 requests an interactive positioning signal from the vehicle-mounted OBD locator, the positioning chip 222 receives the positioning signal of the Beidou satellite, and transmits it to the vehicle computer 101 through the OBD connector 1 after processing, thereby realizing high-precision positioning of the Beidou satellite.

[0091] If the control chip 233 controls the positioning chip moving mechanism 21 to repeat the action for multiple times and the multiple positioning signal strengths obtained are all lower than the positioning signal strength threshold, the positioning unit controller 23 controls the main positioning unit 2 to be in the standby state and the auxiliary positioning unit 3 to be in the working state;

[0092] If the positioning chip moving mechanism 21 of the auxiliary positioning unit 3 is in the initial state, and the positioning signal strength obtained by the data analysis chip 232 of the auxiliary positioning unit 3 is greater than the positioning signal strength threshold, the positioning chip 222 of the auxiliary positioning unit 3 receives the positioning signal of the Beidou satellite and transmits it to the vehicle computer 101 through the OBD connector 1 after processing.

[0093] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The vehicle-mounted OBD locator based on Beidou positioning chip is characterized by: The invention comprises an OBD connector (1), a main positioning unit (2) and a secondary positioning unit (3), wherein the OBD connector (1) is connected to an on-board OBD interface (100), the main positioning unit (2) comprises a positioning chip moving mechanism (21), a positioning signal circuit board (22) based on the positioning chip and a positioning unit controller (23), the positioning chip moving mechanism (21) is installed at a fixed position in the vehicle, the positioning signal circuit board (22) is installed at a moving part of the positioning chip moving mechanism (21) and moves following the moving part, the positioning unit controller (23) is integrated at the positioning signal circuit board (22) and is communicatively connected with the positioning signal circuit board (22), and the execution action of the positioning chip moving mechanism (21) is controlled based on the strength of the positioning signal, the moving part of the positioning chip moving mechanism (21) drives the positioning signal circuit board (22) to move to improve the positioning signal, and the secondary positioning unit (3) has the same structure as the main positioning unit (2), and the installation position is set at a distance from the center point of the positioning chip moving mechanism (21); The positioning chip moving mechanism (21) is a DC reciprocating electric push rod, and the positioning signal circuit board (22) is installed at the end of the telescopic rod of the DC reciprocating electric push rod. When the telescopic rod of the DC reciprocating electric push rod is extended, the positioning signal circuit board (22) is driven to move between an initial position and a maximum stroke. The positioning unit controller (23) controls the telescopic rod of the positioning chip moving mechanism (21) to extend a set distance each time, records the positioning signal strength of the positioning signal circuit board (22), obtains the position with the maximum signal strength, and controls the telescopic rod of the positioning chip moving mechanism (21) to remain at the position with the maximum signal strength.

2. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 1 is characterized in that: The positioning signal circuit board (22) comprises a circuit substrate (221) and a positioning chip (222); the circuit substrate (221) is fixedly mounted on the end of a telescopic rod of a positioning chip moving mechanism (21); the positioning chip (222) is integrated on the circuit substrate (221) and is used to send and receive positioning signals.

3. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 2 is characterized in that: The positioning chip (222) is a Beidou positioning chip.

4. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 3 is characterized in that: The positioning unit controller (23) comprises a positioning signal buffer (231), a data analysis chip (232) and a control chip (233); the positioning signal buffer (231) is connected to the positioning chip (222) in communication based on the NMEA protocol to collect NMEA data; the data analysis chip (232) is connected to the positioning signal buffer (231) in communication; the data analysis chip (232) parses the NMEA sentence received from the positioning chip (222) to extract signal strength information, and feeds back the signal strength information to the control chip (233); the control chip (233) controls the execution action of the positioning chip moving mechanism (21) according to the signal strength information.

5. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 4 is characterized in that: The installation position of the center point of the positioning chip moving mechanism (21) of the auxiliary positioning unit (3) is at least one meter away from the center point of the positioning chip moving mechanism (21) of the main positioning unit (2), and the positioning unit controller (23) controls the working state of the main positioning unit (2) and the auxiliary positioning unit (3).

6. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 5 is characterized in that: It also comprises a power supply unit (4), wherein the power supply unit (4) supplies power to the main positioning unit (2) and at least one auxiliary positioning unit (3).

7. The vehicle-mounted OBD locator based on Beidou positioning chip according to claim 6 is characterized in that: The power supply unit (4) comprises a small lithium battery (41) and a charging module (42); the small lithium battery (41) supplies power to the main positioning unit (2) and the auxiliary positioning unit (3) respectively; when the vehicle is in a running state, the charging module (42) charges the small lithium battery (41) through the OBD connector (1).

8. The vehicle-mounted positioning method based on Beidou positioning chip is characterized by: The vehicle-mounted OBD locator based on the Beidou positioning chip described in claim 7 is used for positioning, comprising the following steps: In a default state, the positioning unit controller (23) controls the main positioning unit (2) to be in a working state and the auxiliary positioning unit (3) to be in a standby state; Every ten seconds, the data analysis chip (232) analyzes the NMEA sentence received from the positioning chip (222) to extract the positioning signal strength information, and compares it with the positioning signal strength threshold. If it is less than the positioning signal strength threshold, a signal indicating that the positioning signal strength is weak is fed back to the control chip (233). The control chip (233) controls the telescopic rod of the positioning chip moving mechanism (21) to extend 10 mm. The data analysis chip (232) analyzes the signal strength information again. The control chip (233) controls the positioning chip moving mechanism (21) to repeat the action multiple times until the maximum stroke is reached. The positioning signal strength information after the multiple actions is compared respectively. The position with the maximum positioning signal strength is taken as the adjustment working position. The control chip (233) controls the telescopic rod of the positioning chip moving mechanism (21) to work at the adjustment working position. When the vehicle computer (101) requests an interactive positioning signal from the vehicle-mounted OBD locator, the positioning chip (222) receives the positioning signal of the Beidou satellite and transmits it to the vehicle computer (101) through the OBD connector (1) after processing, thereby realizing high-precision Beidou satellite positioning.

9. The vehicle-mounted positioning method based on Beidou positioning chip according to claim 8, characterized in that: If the control chip (233) controls the positioning chip moving mechanism (21) to repeat the action multiple times and the strength of multiple positioning signals obtained are all lower than the positioning signal strength threshold, the positioning unit controller (23) controls the main positioning unit (2) to be in a standby state and the auxiliary positioning unit (3) to be in a working state; If the positioning chip moving mechanism (21) of the auxiliary positioning unit (3) is in an initial state, and the positioning signal strength obtained by the analysis of the data analysis chip (232) of the auxiliary positioning unit (3) is greater than the positioning signal strength threshold, the positioning chip (222) of the auxiliary positioning unit (3) receives the positioning signal of the Beidou satellite, and transmits it to the vehicle computer (101) through the OBD connector (1) after processing.

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