Self-checking and early warning control system and method for filling equipment

Abstract

The invention discloses a self-checking and early warning control system and method for filling equipment, and belongs to the field of intelligent vehicle equipment. The system comprises a vacuum pipeline self-checking module, a filling pipeline self-checking module, a liquid back-suction pipeline self-checking module, a controller and a server, and the controller is connected with the vacuum pipeline self-checking module, the filling pipeline self-checking module, the liquid back-suction pipeline self-checking module and the server. The self-checking module is used for controlling the self-checking process of the vacuum pipeline self-checking module, the filling pipeline self-checking module and the liquid back-sucking pipeline self-checking module, collecting self-checking data and uploading the self-checking data to the server; and the server is used for generating an early warning report according to the self-inspection data. According to the invention, through self-inspection and early warning of the vehicle filling equipment, the long-term stable operation capability of the equipment and the efficiency and accuracy of equipment maintenance and management are improved.

Description

Technical Field

[0001] This invention belongs to the field of intelligent vehicle equipment. Specifically, this invention relates to a self-inspection and early warning control system and method for refueling equipment. Background Technology

[0002] In the automobile manufacturing process, the final assembly workshop has a high concentration of production personnel, and the equipment and lighting consume a lot of water, electricity and gas energy. Therefore, it is necessary to minimize the waste of production resources caused by production line abnormalities during the production process, and the phenomenon of equipment shutdowns and stoppages needs to be closely controlled.

[0003] In equipment management, although personnel perform maintenance and repairs, unforeseen equipment failures are inevitable in today's large-scale production processes. This is especially true for vehicle refueling equipment, including gear transmission lubrication systems such as the front / rear axle / transmission / engine, vehicle braking systems, engine (battery / motor) cooling systems, and cabin cooling systems—equipment that requires the refueling of various liquid media. Because relying solely on routine manual inspections of the sensors and hydraulic / pneumatic systems makes it difficult to identify potential and critical problems within the system, any equipment exceeding critical values ​​during production will immediately cause shutdowns and waste of production resources.

[0004] Therefore, this invention proposes a self-inspection and early warning control system and method for refueling equipment. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and proposes a self-inspection and early warning control system and method for refueling equipment, so as to achieve the following objectives: to realize the self-inspection and early warning of vehicle refueling equipment.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a self-inspection and early warning control system for a filling device, the system comprising a vacuum pipeline self-inspection module, a filling pipeline self-inspection module, a liquid backflow pipeline self-inspection module, a controller, and a server, wherein the controller is connected to the vacuum pipeline self-inspection module, the filling pipeline self-inspection module, the liquid backflow pipeline self-inspection module, and the server respectively, and is used to control the self-inspection process of the vacuum pipeline self-inspection module, the filling pipeline self-inspection module, and the liquid backflow pipeline self-inspection module and collect self-inspection data and upload it to the server; the server is used to generate an early warning report based on the self-inspection data.

[0007] Preferably, the vacuum pipeline self-test module includes a temperature sensor 1 installed on the vacuum pipeline, and a vacuum pump 2, a solenoid valve 3, a solenoid valve 7, and a vehicle system 21 connected in sequence through the vacuum pipeline. The vacuum pipeline between the solenoid valve 3 and the solenoid valve 7 is also connected to the vacuum sensor 6 through the solenoid valve 5, and to the liquid storage tank 8 through the solenoid valve 4. The control terminals of each solenoid valve, the vacuum pump 2, the vacuum sensor 6, and the temperature sensor 1 are all electrically connected to the controller.

[0008] Preferably, the self-test module for the filling pipeline includes a temperature sensor 10 installed on the filling pipeline, and a storage tank 8, a filling pump 11, a flow meter 12, a solenoid valve 14, and a vehicle system 21 connected sequentially through the filling pipeline. It also includes a liquid level sensor 9 installed on the storage tank 8, and a temperature sensor 10 and a pressure sensor 13 installed on the filling pipeline. The control terminals of each solenoid valve, the filling pump 11, the flow meter 12, the liquid level sensor 9, the temperature sensor 10, and the pressure sensor 13 are all electrically connected to the controller.

[0009] Preferably, the liquid backflow pipeline self-test module includes a vacuum sensor 16, a vacuum generator 17, a solenoid valve 18, a solenoid valve 20, and a vehicle system 21 connected sequentially through the liquid backflow pipeline; wherein, the liquid backflow pipeline between the solenoid valve 18 and the solenoid valve 20 is also connected to the liquid storage tank 8 through the solenoid valve 15 and to the atmosphere through the solenoid valve 19; the control terminals of each solenoid valve, the vacuum sensor 16, and the vacuum generator 17 are all electrically connected to the controller.

[0010] Preferably, the controller is a programmable logic controller (PLC).

[0011] Preferably, the server is also connected to the user terminal via a wireless communication network for sending early warning reports to the user terminal.

[0012] This invention also proposes a self-inspection and early warning control method for refueling equipment. Using the above-mentioned self-inspection and early warning control system for refueling equipment, the method includes the following steps:

[0013] Step S1: The controller controls the vacuum pipeline self-test module, the filling pipeline self-test module, and the liquid back suction pipeline self-test module to start self-testing based on the preset self-testing process, and samples the self-testing data in real time during the self-testing process;

[0014] Step S2: The controller sends the real-time sampled self-test data to the server;

[0015] Step S3: The server, in conjunction with the preset standard parameter range and process parameter requirements in its own database, analyzes and processes the self-inspection data to generate an equipment detection early warning report.

[0016] Preferably, the self-test steps of the vacuum pipeline self-test module include:

[0017] When the self-test begins, the controller closes solenoid valves 4 and 7 and opens solenoid valves 3 and 5, starts vacuum pump 2 to evacuate the current vacuum line. At the same time, temperature sensor 1 measures the temperature of the vacuum line in real time, and vacuum sensor 6 measures the negative pressure value of the vacuum line in real time. The corresponding temperature and negative pressure values ​​are sent to the controller.

[0018] When the controller detects that the negative pressure value has reached the preset negative pressure threshold, it controls the solenoid valve 3 to close. After the vacuum detection time reaches the preset time, the vacuum sensor 6 detects the current negative pressure value of the vacuum pipeline again and sends it to the controller, and the self-test ends.

[0019] Preferably, the self-test steps of the filling pipeline self-test module include:

[0020] The self-test begins when the controller closes the solenoid valve 14 and starts the filling pump 11. At the same time, the liquid level sensor 9 measures the liquid level in the storage tank 8 in real time, the temperature sensor 10 measures the temperature of the filling pipeline in real time, the flow meter 12 detects the filling volume in real time, and the pressure sensor 13 detects the pressure of the filling pipeline in real time. The corresponding liquid level, filling pipeline temperature, filling volume, and filling pipeline pressure values ​​are all sent to the controller. The self-test ends after the preset time has elapsed.

[0021] Preferably, the self-test steps of the liquid back suction line self-test module include:

[0022] The self-test begins when the controller starts the vacuum generator 117, opens the solenoid valve 18, and closes the solenoid valves 15, 19, and 20. At the same time, the vacuum sensor 16 detects the vacuum negative pressure value of the liquid return pipe in real time and sends it to the controller. The self-test ends after the preset time has elapsed.

[0023] The technical effects of this invention are as follows:

[0024] (1) This invention improves the long-term stable operation capability of the equipment: By regularly performing self-inspection on the key parameters of the filling equipment and the pipeline system, potential problems can be detected in advance. For example, in the self-inspection of the vacuum pipeline, filling pipeline and liquid back suction pipeline, the deviation from the standard parameters in the system can be detected in time. Before the problem worsens and causes equipment failure, the equipment's operational stability and reliability are enhanced, thereby improving the long-term stable operation capability of the equipment.

[0025] (2) The present invention improves the efficiency and accuracy of equipment maintenance management: the intelligent self-inspection mechanism automatically detects and generates detailed reports, which clearly show the parts and items that need maintenance. Maintenance personnel can carry out targeted work based on the reports without the need for comprehensive investigation, saving time and energy and improving the efficiency and accuracy of maintenance management.

[0026] (3) This invention reduces equipment maintenance costs and energy consumption: it detects and addresses potential equipment problems in advance, avoiding high maintenance costs and long-term downtime losses caused by sudden failures. At the same time, stable equipment operation reduces energy consumption caused by frequent start-ups and shutdowns due to failures, thereby reducing equipment maintenance costs and energy consumption.

[0027] (4) This invention can improve the quality of vehicle manufacturing: In the vehicle manufacturing filling process, when filling various liquid media, the vehicle system sealing and pressure resistance performance are ensured by steps such as negative pressure leak detection, positive pressure leak detection and liquid back suction, combined with the self-inspection of the filling equipment, so as to ensure the qualified output of the vehicle and improve the quality of vehicle manufacturing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the self-testing system structure of the filling equipment provided in this embodiment;

[0029] Figure 2 This embodiment provides a control principle diagram for a self-inspection and early warning control system for a refueling device.

[0030] Figure 1 In the middle: Temperature sensor 1; Vacuum pump 2; Solenoid valve 3; Solenoid valve 4; Solenoid valve 5; Vacuum sensor 6; Solenoid valve 7; Liquid storage tank 8; Liquid level sensor 9; Temperature sensor 10; Filling pump 11; Flow meter 12; Pressure sensor 13; Solenoid valve 14; Solenoid valve 15; Vacuum sensor 16; Vacuum generator 17; Solenoid valve 18; Solenoid valve 19; Solenoid valve 20; Vehicle system 21. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. This is to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solutions of the present invention, and to facilitate its implementation. It should be noted that the terms "first," "second," etc., used in this application are only for the convenience of describing the technical solutions and to distinguish components; the corresponding component configurations may be the same or different, and are not intended to limit the scope of this application. To make the technical solutions of the present invention clearer, the present invention will be explained and illustrated through the following embodiments.

[0032] This embodiment provides a self-test and early warning control system for a refueling device, such as... Figure 1 and Figure 2As shown, the system includes a vacuum pipeline self-test module, a filling pipeline self-test module, a liquid backflow pipeline self-test module, a controller, and a server. The controller is connected to the vacuum pipeline self-test module, the filling pipeline self-test module, the liquid backflow pipeline self-test module, and the server, respectively, and is used to control the self-test process of the vacuum pipeline self-test module, the filling pipeline self-test module, and the liquid backflow pipeline self-test module and collect self-test data and upload it to the server. The server is used to generate an early warning report based on the self-test data.

[0033] This invention employs an intelligent self-inspection and early warning mechanism. The controller performs self-inspections on the vacuum pipeline, filling pipeline, and liquid backflow pipeline of the filling equipment, primarily involving periodic monitoring of key parameters such as vacuum, pressure, and temperature. The corresponding detection data is transmitted to a server via the controller. The server then analyzes and processes the received data based on preset standard parameter ranges in its database, generating an early warning report. This report includes comparisons of each detection data point with the preset standard parameter ranges. Based on this report, abnormal data or data falling within a critical preset range can be identified, allowing users to perform targeted maintenance, repairs, and other operations. This automated process helps to detect potential equipment problems early, enhancing the stability and reliability of equipment operation and reducing downtime and losses caused by sudden failures.

[0034] Specifically, the vacuum pipeline self-test module of this embodiment includes a temperature sensor 1 installed on the vacuum pipeline, and a vacuum pump 2, a solenoid valve 3, a solenoid valve 7, and a vehicle system 21 connected in sequence through the vacuum pipeline. The vacuum pipeline between the solenoid valve 3 and the solenoid valve 7 is also connected to the vacuum sensor 6 through the solenoid valve 5, and to the liquid storage tank 8 through the solenoid valve 4. The control terminals of each solenoid valve, the vacuum pump 2, the vacuum sensor 6, and the temperature sensor 1 are all electrically connected to the controller, which is responsible for driving and data acquisition.

[0035] The self-test module for the filling pipeline includes a temperature sensor 10 installed on the filling pipeline, and a storage tank 8, a filling pump 11, a flow meter 12, a solenoid valve 14, and a vehicle system 21 connected sequentially through the filling pipeline. It also includes a liquid level sensor 9 installed on the storage tank 8, and a temperature sensor 10 and a pressure sensor 13 installed on the filling pipeline. The control terminals of each solenoid valve, the filling pump 11, the flow meter 12, the liquid level sensor 9, the temperature sensor 10, and the pressure sensor 13 are all electrically connected to the controller, which is responsible for driving and data acquisition.

[0036] The liquid backflow pipeline self-test module includes a vacuum sensor 16, a vacuum generator 17, a solenoid valve 18, a solenoid valve 20, and a vehicle system 21 connected sequentially through the liquid backflow pipeline. The liquid backflow pipeline between solenoid valve 18 and solenoid valve 20 is also connected to the liquid storage tank 8 through solenoid valve 15 and to the atmosphere through solenoid valve 19. The control terminals of each solenoid valve, vacuum sensor 16, and vacuum generator 17 are all electrically connected to the controller, which is responsible for driving and data acquisition.

[0037] The uses of each component in the refueling equipment are as follows:

[0038] Temperature sensor 1: measures the temperature of the vacuum line;

[0039] Vacuum pump 2: Evacuates the vacuum lines of the filling equipment;

[0040] Solenoid valve 3: controls the opening and closing of the vacuum pump 2 vacuum line;

[0041] Solenoid valve 4: controls the connection between the vacuum pipeline and the liquid storage tank 8;

[0042] Solenoid valve 5: controls the connection between vacuum sensor 6 and the vacuum pipeline;

[0043] Vacuum sensor 6: measures the negative pressure value inside the vacuum line;

[0044] Solenoid valve 7: controls the connection between the vacuum line and vehicle system 21;

[0045] Storage tank 8: Stores liquids to be added;

[0046] Liquid level sensor 9: detects the amount of liquid stored in storage tank 8;

[0047] Temperature sensor 10: detects the temperature of the filling pipeline;

[0048] Filling pump 11: pressurizes the filling line and fills the liquid into the vehicle system 21;

[0049] Flow meter 12: detects the liquid filling rate;

[0050] Pressure sensor 13: Detects pressure in the filling pipeline;

[0051] Solenoid valve 14: controls the on / off connection between the filling pipeline and the vehicle system 21;

[0052] Solenoid valve 15: controls the connection between the liquid back suction line and the storage tank 8;

[0053] Vacuum sensor 16: Detects the vacuum level in the liquid return line;

[0054] Vacuum generator 17: Makes the liquid return suction line reach a negative pressure state;

[0055] Solenoid valve 18: controls the on / off connection between vacuum generator 17 and liquid return line;

[0056] Solenoid valve 19: controls the opening and closing of the liquid return pipeline connection to the atmosphere, causing the returned liquid to flow into the storage tank 8;

[0057] Solenoid valve 20: controls the connection between the liquid return line and the vehicle system 21;

[0058] Vehicle System 21: Includes equipment that requires the addition of various liquid media, such as gear transmission lubrication systems (front axle / rear axle / transmission / engine), vehicle braking systems, engine (battery / motor) cooling systems, and cabin cooling systems.

[0059] The entire system structure of this invention is simple, covering the self-inspection requirements of vacuum pipeline, filling pipeline, and liquid back suction pipeline. Through the orderly control of various solenoid valves, the driving of corresponding equipment (vacuum pump, filling pump, vacuum generator), and the data detection and analysis of various sensors, the self-inspection of the filling equipment is realized.

[0060] In other embodiments of the present invention, the system is also used for testing the sealing and pressure resistance of the vehicle refueling process, thereby ensuring the qualified production of vehicles. This includes:

[0061] Negative pressure leak detection: This refers to a pressure-holding leak test conducted after a vehicle system has been evacuated.

[0062] Positive pressure leak detection: After filling the vehicle system with liquid, monitor the pressure inside the vehicle system and conduct a pressure resistance test;

[0063] Vehicle system fluid backflow: After the above positive pressure leak detection steps are passed, excess fluid needs to be recovered to ensure that the fluid level in the vehicle system is within the acceptable range.

[0064] In this embodiment, the controller adopts a programmable logic controller (PLC), which supports preset control programs, including multiple functions such as setting the start / stop sequence of solenoid valves, setting the self-test time, and data comparison, to meet various control requirements. At the same time, the PLC also has the advantages of simple deployment, fast response speed, and support for multiple data communication methods, which can reduce the cost of the self-test system, improve the real-time performance of the self-test system, and meet the data transmission requirements of the self-test system.

[0065] In this embodiment, the controller connects to the server via a wireless communication network. The server can collect parameters such as sensor values ​​and self-test time during the equipment's self-test process, analyze them, and generate early warning reports. Simultaneously, the server also connects to user terminals via the wireless communication network to send early warning reports to user terminals (including various production management systems). The wireless communication network can use cellular networks such as 4G / 5G to ensure stable and efficient communication. This embodiment delegates data analysis tasks to a remote server. Leveraging the server's powerful data processing capabilities, early warning reports can be quickly generated and distributed to various user terminals. Users can then promptly detect anomalies and take targeted measures, thereby improving the long-term stable operation of the equipment and enhancing the efficiency and accuracy of equipment maintenance management.

[0066] This embodiment also proposes a self-inspection and early warning control method for refueling equipment. Using the above-mentioned self-inspection and early warning control system for refueling equipment, the method includes the following steps:

[0067] Step S1: The controller controls the vacuum pipeline self-test module, the filling pipeline self-test module, and the liquid back suction pipeline self-test module to start self-testing based on the preset self-testing process, and samples the self-testing data in real time during the self-testing process;

[0068] Step S2: The controller sends the real-time sampled self-test data to the server;

[0069] Step S3: The server, in conjunction with the preset standard parameter range and process parameter requirements in its own database, analyzes and processes the self-inspection data to generate an equipment detection early warning report.

[0070] Specifically, the self-test of the vacuum pipeline self-test module involves using a vacuum pump to evacuate the vacuum pipeline of the filling equipment and using a vacuum sensor to detect the negative pressure value. The specific steps include:

[0071] When the self-test begins, the controller closes solenoid valves 4 and 7 and opens solenoid valves 3 and 5, starts vacuum pump 2 to evacuate the current vacuum line. At the same time, temperature sensor 1 measures the temperature of the vacuum line in real time, and vacuum sensor 6 measures the negative pressure value of the vacuum line in real time. The corresponding temperature and negative pressure values ​​are sent to the controller.

[0072] When the controller detects that the negative pressure value has reached the preset negative pressure threshold, it controls the solenoid valve 3 to close. The vacuum sensor 6 detects the current negative pressure value of the vacuum pipeline again and sends it to the controller. At this time, the vacuum pipeline between the solenoid valve 3 and the solenoid valve 7 is isolated. The detection of the vacuum sensor 6 at this time is used for pipeline airtightness detection. After the vacuum detection time reaches the preset time, the self-test ends.

[0073] The self-test of the filling pipeline self-test module involves using a filling pump to pressurize the filling equipment's filling pipeline, and then using a pressure sensor to detect the system pressure value and a temperature sensor to detect the system temperature value. Specific steps include:

[0074] The self-test begins when the controller closes the solenoid valve 14 and starts the filling pump 11. At the same time, the liquid level sensor 9 measures the liquid level in the storage tank 8 in real time, the temperature sensor 10 measures the temperature of the filling pipeline in real time, the flow meter 12 detects the filling volume in real time, and the pressure sensor 13 detects the pressure of the filling pipeline in real time. The corresponding liquid level, filling pipeline temperature, filling volume, and filling pipeline pressure values ​​are all sent to the controller. The self-test ends after the preset time has elapsed.

[0075] The self-test of the liquid back suction line self-test module involves using a vacuum generator to evacuate the liquid back suction line of the filling equipment, and then detecting the negative pressure value of the system using a vacuum sensor. Specific steps include:

[0076] The self-test begins when the controller starts the vacuum generator 117, opens the solenoid valve 18, and closes the solenoid valves 15, 19, and 20. At the same time, the vacuum sensor 16 detects the vacuum negative pressure value of the liquid return pipe in real time and sends it to the controller. The self-test ends after the preset time has elapsed.

[0077] In addition, in step S3, the server sets corresponding comparison thresholds for the data collected by the controller in each self-test process according to the preset standard parameter range and process parameter requirements in the database. By comparing each detection data with the threshold, the server can identify if the data is abnormal or in the critical preset range, and record the corresponding abnormal value and data source in the warning report, which facilitates the user's targeted equipment maintenance.

[0078] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A self-inspection and early warning control system for a refueling device, characterized in that: The system includes a vacuum pipeline self-test module, a filling pipeline self-test module, a liquid backflow pipeline self-test module, a controller, and a server. The controller is connected to the vacuum pipeline self-test module, the filling pipeline self-test module, the liquid backflow pipeline self-test module, and the server, respectively, and is used to control the self-test process of the vacuum pipeline self-test module, the filling pipeline self-test module, and the liquid backflow pipeline self-test module and collect self-test data and upload it to the server. The server is used to generate an early warning report based on the self-test data.

2. The self-inspection and early warning control system for a refueling device according to claim 1, characterized in that: The vacuum pipeline self-test module includes a temperature sensor (1) installed on the vacuum pipeline, and a vacuum pump (2), a solenoid valve (3), a solenoid valve (7), and a vehicle system (21) connected in sequence through the vacuum pipeline. The vacuum pipeline between the solenoid valve (3) and the solenoid valve (7) is also connected to the vacuum sensor (6) through the solenoid valve (5) and to the liquid storage tank (8) through the solenoid valve (4). The control terminals of each solenoid valve, the vacuum pump (2), the vacuum sensor (6), and the temperature sensor (1) are all electrically connected to the controller.

3. The self-inspection and early warning control system for a refueling device according to claim 1, characterized in that: The self-test module of the filling pipeline includes a temperature sensor (10) installed on the filling pipeline, and a storage tank (8), a filling pump (11), a flow meter (12), a solenoid valve (14), and a vehicle system (21) connected in sequence through the filling pipeline. It also includes a liquid level sensor (9) installed on the storage tank (8), a temperature sensor (10) installed on the filling pipeline, and a pressure sensor (13). The control terminals of each solenoid valve, the filling pump (11), the flow meter (12), the liquid level sensor (9), the temperature sensor (10), and the pressure sensor (13) are all electrically connected to the controller.

4. The self-inspection and early warning control system for a refueling device according to claim 1, characterized in that: The liquid backflow pipeline self-test module includes a vacuum sensor (16), a vacuum generator (17), a solenoid valve (18), a solenoid valve (20), and a vehicle system (21) connected in sequence through the liquid backflow pipeline; wherein, the liquid backflow pipeline between the solenoid valve (18) and the solenoid valve (20) is also connected to the storage tank (8) through the solenoid valve (15) and to the atmosphere through the solenoid valve (19); the control terminals of each solenoid valve, the vacuum sensor (16), and the vacuum generator (17) are all electrically connected to the controller.

5. A self-inspection and early warning control system for a refueling device according to any one of claims 1-4, characterized in that: The controller is a programmable logic controller (PLC).

6. A self-inspection and early warning control system for a refueling device according to any one of claims 1-4, characterized in that: The server is also connected to the user terminal via a wireless communication network to send early warning reports to the user terminal.

7. A self-inspection and early warning control method for a refueling equipment, using a self-inspection and early warning control system for a refueling equipment according to any one of claims 1-6, characterized in that: The method includes the following steps: Step S1: The controller controls the vacuum pipeline self-test module, the filling pipeline self-test module, and the liquid back suction pipeline self-test module to start self-testing based on the preset self-testing process, and samples the self-testing data in real time during the self-testing process; Step S2: The controller sends the real-time sampled self-test data to the server; Step S3: The server, in conjunction with the preset standard parameter range and process parameter requirements in its own database, analyzes and processes the self-inspection data to generate an equipment detection early warning report.

8. The self-inspection and early warning control method for a refueling device according to claim 7, characterized in that: The self-test steps of the vacuum pipeline self-test module include: When the self-test begins, the controller controls the solenoid valves (4) and (7) to close and the solenoid valves (3) and (5) to open, and starts the vacuum pump (2) to evacuate the current vacuum pipeline. At the same time, the temperature sensor (1) measures the temperature of the vacuum pipeline in real time, and the vacuum sensor (6) measures the negative pressure value of the vacuum pipeline in real time. The corresponding temperature and negative pressure values ​​are sent to the controller. When the controller detects that the negative pressure value has reached the preset negative pressure threshold, it controls the solenoid valve (3) to close. After the vacuum detection time reaches the preset time, the vacuum sensor (6) detects the current vacuum pipeline negative pressure value again and sends it to the controller, and the self-test ends.

9. The self-inspection and early warning control method for a refueling device according to claim 7, characterized in that: The self-test steps of the filling pipeline self-test module include: At the start of the self-test, the controller closes the solenoid valve (14) and starts the filling pump (11). At the same time, the liquid level sensor (9) measures the liquid storage volume of the storage tank (8) in real time, the temperature sensor (10) measures the temperature of the filling pipeline in real time, the flow meter (12) detects the filling volume in real time, and the pressure sensor (13) detects the pressure of the filling pipeline in real time. The corresponding liquid storage volume, filling pipeline temperature, filling volume, and filling pipeline pressure are all sent to the controller. The self-test ends after the self-test time reaches the preset time.

10. The self-inspection and early warning control method for a refueling device according to claim 7, characterized in that: The self-test steps of the liquid back suction line self-test module include: When the self-test begins, the controller starts the vacuum generator (117), opens the solenoid valve (18), and closes the solenoid valves (15), (19), and (20). At the same time, the vacuum sensor (16) detects the vacuum negative pressure value of the liquid return pipe in real time and sends it to the controller. After the self-test time reaches the preset time, the self-test ends.

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