Method and device for preventing and controlling leakage of normally closed valve of brake-by-wire system

Abstract

The invention provides a method and device for preventing and controlling leakage of normally closed valves of a brake-by-wire system, and the method comprises the steps: controlling filling equipment to fill brake fluid into the brake-by-wire system under the condition that no leakage exists in the brake-by-wire system, and controlling the brake-by-wire system to close all the normally closed valves; the control line control braking system is used for sequentially washing all the normally-closed valves for preset times; controlling leakage detection equipment to carry out valve body leakage detection on all normally closed valves in the brake-by-wire system; and under the condition that valve body leakage does not exist in all the normally-closed valves, it is determined that leakage detection is qualified. The sealing performance of the normally-closed valve can be kept in a good state all the time, leakage of the normally-closed valve of the brake-by-wire system is prevented, and the overall performance and safety of the brake-by-wire system are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile braking, and in particular to a method and device for preventing and controlling leakage of a normally closed valve of a wire-controlled brake system. Background Art

[0002] The brake-by-wire system is a major innovation in modern automotive braking technology. It realizes the electronic and intelligent braking operation through electrical signal transmission and control of actuators. Compared with the traditional mechanical brake-by-wire system, the brake-by-wire system has a faster and more precise braking response, as well as higher active safety and stability. However, this also puts higher requirements on the sealing and reliability of the system to prevent leakage of brake fluid or other media. The normally closed valve is a key component in the brake-by-wire system. It is usually in a closed state and will only open when it receives a specific electrical or mechanical signal to allow the brake fluid or air pressure to pass through. The sealing performance of the normally closed valve directly affects the overall performance and safety of the brake-by-wire system. Summary of the invention

[0003] In order to prevent leakage of the normally closed valve of the wire control brake system and ensure the overall performance and safety of the wire control brake system, the present invention provides a method and device for preventing leakage of the normally closed valve of the wire control brake system. The technical solution proposed by the present invention is as follows: In a first aspect, the present invention provides a method for preventing and controlling leakage of a normally closed valve of a wire control brake system, comprising: In the case where there is no leakage in the wire control brake system, controlling the filling device to fill the wire control brake system with brake fluid; Controlling the brake-by-wire system to close all normally closed valves; Controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times; Controlling the leakage detection equipment to perform valve body leakage detection on all normally closed valves in the brake-by-wire system; When there is no valve body leakage in all normally closed valves, it is determined that the leakage test is qualified.

[0004] Optionally, controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times includes: Controlling the brake-by-wire system to pressurize to a first preset pressure; controlling the brake-by-wire system to flush all normally closed valves in sequence according to a preset order under the first preset pressure; The above steps of controlling the brake-by-wire system to pressurize and flush the normally closed valve are repeated until a preset number of times is reached.

[0005] Optionally, the control leakage detection device performs valve body leakage detection on all normally closed valves in the brake-by-wire system, including: Controlling the brake-by-wire system to pressurize to a second preset pressure and stabilizing the pressure for a preset time; controlling the leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system in a preset order under the second preset pressure; When all normally closed valves have no valve body leakage at the second preset pressure, controlling the brake-by-wire system to be pressurized to a third preset pressure and stabilizing the pressure for a preset time; The control leakage detection device performs valve body leakage detection on all normally closed valves in the brake-by-wire system in a preset order under the third preset pressure, wherein the second preset pressure is greater than the third preset pressure.

[0006] Optionally, when there is no leakage in the brake-by-wire system, before controlling the filling device to fill the brake-by-wire system with brake fluid, the method further includes: Controlling the brake-by-wire system to open a normally closed valve; controlling the filling device to evacuate the brake-by-wire system; Control the leak detection equipment to perform leak detection on the brake-by-wire system.

[0007] Optionally, before controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times, the method further includes: Control the filling device to store the filling information and upload it to the associated device; Controlling the filling device to write a filling byte into the brake-by-wire system; The brake-by-wire system is controlled to feed back a filling byte writing completion signal to the filling device.

[0008] Optionally, the method further comprises: When all normally closed valves have no valve body leakage under the third preset pressure, controlling the filling device to read the internal fault of the brake-by-wire system; Controlling the filling device to clear the internal fault of the brake-by-wire system; Controlling the filling device to write function configuration bytes into the brake-by-wire system; The filling device is controlled to read the parts and software version number of the wire control brake system.

[0009] In a second aspect, the present invention provides a device for preventing and controlling leakage of a normally closed valve of a wire control brake system, comprising: A filling module, used for controlling the filling device to fill the brake fluid into the brake-by-wire system when there is no leakage in the brake-by-wire system; A closing module, used for controlling the brake-by-wire system to close all normally closed valves; A flushing module, used to control the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times; A detection module, used for controlling a leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system; The judgment module is used to determine that the leakage detection is qualified when there is no valve body leakage in all normally closed valves.

[0010] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for preventing and controlling leakage of a normally closed valve of a brake-by-wire system as described in the first aspect is implemented.

[0011] In a fourth aspect, the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for preventing and controlling leakage of a normally closed valve of a brake-by-wire system as described in the first aspect.

[0012] In a fifth aspect, the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method for preventing and controlling leakage of a normally closed valve of a wire control brake system as described in the first aspect.

[0013] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows: The method for preventing and controlling leakage of the normally closed valve of the brake-by-wire system provided in the embodiment of the present invention optimizes the filling strategy and method, receives the start filling signal of the filling device, controls the filling device to fill the brake-by-wire system with brake fluid, and after the filling is completed, controls the brake-by-wire system to close all its normally closed valves, requests the brake-by-wire system to be pressurized, and flushes all the normally closed valves in sequence for a preset number of times to ensure that foreign matter inside the normally closed valve of the brake-by-wire system is cleaned up, and prevents foreign matter in the brake fluid or brake fluid transmission device during the filling process from entering the normally closed valve, causing abnormal operation or leakage of the normally closed valve, thereby causing a failure of the brake-by-wire system. After the flushing is completed, the filling device will request the brake-by-wire system to perform a valve body leakage test on the normally closed valve, and enter the next link after the leakage test is qualified, which can ensure that the sealing performance of the normally closed valve is always kept in a good state, prevent the normally closed valve of the brake-by-wire system from leaking, and ensure the overall performance and safety of the brake-by-wire system.

[0014] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the vacuum filling process for conventional vehicles off the production line.

[0018] Figure 2 This is a schematic diagram of the brake fluid flow during the vacuum filling process of a conventional vehicle off-line.

[0019] Figure 3 It is one of the flow charts of the method for preventing and controlling leakage of the normally closed valve of the wire control brake system provided by the present invention.

[0020] Figure 4 It is a schematic diagram of the flow direction of the brake fluid during vacuum filling of a vehicle off-line according to the present invention.

[0021] Figure 5 It is a signal block diagram of the method for preventing and controlling leakage of a normally closed valve of a wire control brake system provided by the present invention.

[0022] Figure 6 This is the second flow chart of the method for preventing and controlling leakage of the normally closed valve of the wire control brake system provided by the present invention.

[0023] Figure 7 It is a structural schematic diagram of a device for preventing and controlling leakage of a normally closed valve of a brake-by-wire system provided by the present invention.

[0024] Figure 8 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1The figure shows the flow chart of vacuum filling of conventional vehicles off the line, that is, the vehicle exchanges signals with the filling equipment, connects the filling equipment to the oil tank port of the brake oil tank of the wire control brake system, and the wire control brake system opens the solenoid valve and the normally closed valve, and the filling equipment starts to evacuate the vacuum, and after the vacuum is completed, a leak test is performed. After the leak test is completed, the brake fluid is vacuum filled. After the filling is completed, the filling equipment stores the filling information and transmits it to the networked associated equipment. After the whole cycle is completed, the vacuum filling is completed and the vehicle enters the next link. During the vacuum filling process, the flow direction of the brake fluid in the wire control brake system refers to Figure 2 As shown. The inventor found in his work that since the four normally closed valves only have filters at the oil inlet and no filters at the outlet, during the filling process, the brake fluid and foreign matter of the transmission device may enter the four normally closed valves, causing the normally closed valves to work abnormally or leak, thereby causing the wire control brake system to malfunction. In order to prevent the leakage of the normally closed valves of the wire control brake system, the inventor further developed and optimized the vacuum filling control method to make the present invention.

[0027] Combine the following Figure 3-Figure 6 The invention describes a method for preventing and controlling leakage of a normally closed valve of a wire control brake system.

[0028] Figure 3 It is one of the flow charts of the method for preventing and controlling leakage of the normally closed valve of the wire control brake system provided by the present invention. The execution subject of the method can be any automobile electronic control system. The method includes the following.

[0029] Step 101 : When there is no leakage in the brake-by-wire system, control a filling device to fill the brake-by-wire system with brake fluid.

[0030] First, confirm through the system diagnostic tool or control unit (ECU) that all normally closed valves of the wire control brake system are open and the system is in a state where brake fluid can be safely added. Make sure that the filling equipment (such as a brake fluid filler) is connected to the brake fluid filling port of the wire control brake system and that the filling equipment has been calibrated and prepared in accordance with the manufacturer's requirements. Confirm that the brake fluid used meets the vehicle manufacturer's specifications and that the brake fluid is within the validity period and is not contaminated.

[0031] Secondly, start the filling device and set appropriate filling parameters such as filling speed and filling amount according to the instructions of the filling device. After confirming that everything is ready, send a start filling signal to the filling device. The filling device will start to inject brake fluid into the wire control brake system through the filling port. During the filling process, the operating status of the filling device and the response of the wire control brake system should be closely monitored. Pay attention to the changes in the brake fluid level and whether the system has any abnormal response such as leakage, abnormal pressure, etc. According to the actual needs of the system, adjust the filling amount of the filling device in time. Make sure that the amount of brake fluid added is neither too much nor too little to maintain the normal working pressure and performance of the system.

[0032] When the predetermined filling volume is reached or the system reaches full fluid status, turn off the filling equipment in time and disconnect the connection with the wire control brake system. Use appropriate tools to check whether the brake fluid level of the wire control brake system is within the normal range. If the fluid level is too low, continue to add brake fluid until it reaches the standard level. After filling, the wire control brake system should be fully tested, including brake performance test, pressure test, etc., to ensure that the system is working properly and there are no safety hazards such as leakage. Record the relevant data of the filling process such as filling volume, filling time, system response, etc., and feedback the filling results to the relevant personnel or system.

[0033] Step 102, controlling the brake-by-wire system to close all normally closed valves; First, the overall status of the brake-by-wire system is confirmed through the system diagnostic tool or control unit (ECU) of the vehicle's electronic control system to ensure that there are no faults or abnormal alarms. Receive instructions to close all normally closed valves, which may come from driver operation, vehicle control system or external diagnostic equipment.

[0034] Normally closed valves in a brake-by-wire system usually include but are not limited to pressure reducing valves, suction valves, etc. These valves are closed under normal circumstances to prevent unnecessary flow of brake fluid. Pressure reducing valves are used to adjust the pressure in the brake line to ensure precise control of braking force. Suction valves are usually used in conjunction with hydraulic components such as plunger pumps to provide brake fluid to the brake-by-wire system when needed. Closing the suction valve can prevent the unexpected flow of brake fluid in the system. The process of closing these valves is as follows: When receiving the closing command, the ECU will send a control signal to the actuator of the pressure reducing valve to close it. Similarly, the ECU will send a control signal to the actuator of the suction valve to close it. After closing all normally closed valves, the system should perform a safety verification to ensure that the brake-by-wire system is in a safe state and does not cause brake failure or other safety hazards due to valve closure. The operating results of closing the normally closed valve are fed back to the driver or vehicle control system, and the relevant operation logs are recorded for subsequent analysis and maintenance. It should be noted that since the normally closed valve is in a closed state under normal circumstances or without external force intervention, closing the normally closed valve in the present invention refers to restoring the normally closed valve to a closed state. Opening the normally closed valve is to put the normally closed valve in an open state.

[0035] Step 103: Control the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times.

[0036] First, confirm that the brake fluid filling has been completed and the system is in a stable state through the system diagnostic tool or control unit (ECU). Set the number of flushing times required for each normally closed valve, which is the preset number mentioned above, according to the vehicle manufacturer's recommendations or system maintenance manual. This number of flushing is usually determined based on the vehicle model, usage conditions and historical maintenance records. Make sure that the fluid used for flushing, such as brake fluid or special flushing agent, meets the vehicle manufacturer's specifications and that the fluid is within the validity period and is not contaminated.

[0037] Next, select the normally closed valve that needs to be flushed first. Send a signal to the ECU to start the flushing mode. The ECU will control the corresponding pump or actuator to make the flushing fluid pass through the selected normally closed valve. After the flushing of the first normally closed valve is completed, the system automatically switches to the next normally closed valve and repeats the above flushing steps. Repeat the flushing operation according to the preset flushing times. After each flushing, you can pause for a period of time to allow the flushing fluid to fully flow through the valve and carry away impurities. During the flushing process, the status of the flushing fluid can be monitored through a sensor or observation window to ensure the flushing effect.

[0038] When all normally closed valves have been flushed for the preset number of times, the system automatically ends the flushing process. After the flushing is completed, check the status of the wire control brake system through the system diagnostic tool or the control unit to ensure that all normally closed valves are working properly without leakage or abnormality. If a special flushing agent or other non-brake fluid is used as the flushing fluid, the flushing fluid in the system needs to be drained and refilled with brake fluid that meets the specifications.

[0039] Finally, the brake-by-wire system is fully tested, including brake performance test, pressure test, etc., to ensure that the system works properly and there are no safety hazards.

[0040] Step 104 : Controlling the leakage detection equipment to perform valve body leakage detection on all normally closed valves in the brake-by-wire system.

[0041] First, set the pressure value according to the vehicle manufacturer's recommendations or the system maintenance manual. This pressure value is usually determined according to the vehicle model, usage conditions and system requirements. This pressure should be high enough to detect small leaks, but also avoid exceeding the pressure limit of the system or valve. Make sure that the leak detection equipment used for leak detection, such as pressure gauges, leak detectors, etc., has been connected to the wire control brake system, and the equipment has been calibrated and prepared according to the manufacturer's requirements. Confirm that the wire control brake system is in a stable state and all normally closed valves are closed through the system diagnostic tool or control unit (ECU).

[0042] Secondly, according to the system layout, isolate the normally closed valve that needs to be tested by closing or isolating other valves so that its leakage can be detected more accurately. Slowly pressurize the brake-by-wire system until the preset pressure value is reached. During the pressurization process, the pressure gauge reading should be closely monitored to ensure that the pressure is stable and does not exceed the above preset pressure value. Maintain the preset pressure value for a period of time (usually ranging from a few minutes to a few hours) to observe whether the system has leaks. During this time, pay close attention to changes in the pressure gauge readings, and use a leak detector or other methods to detect whether there are gas or liquid leaks in the system. Based on the observations, record the leakage. If there is a body leak in the normally closed valve, the location, size, and degree of the leak should be recorded.

[0043] Step 105: When there is no valve body leakage in all normally closed valves, it is determined that the leakage detection is qualified.

[0044] If there is no body leakage in all normally closed valves, the leakage test is qualified. If there is a body leakage in one or more normally closed valves, it is necessary to repeat the above steps of normally closed valve flushing S103 and normally closed valve leakage detection S104 until all normally closed valves have no body leakage and the leakage test is determined to be qualified. This is an iterative process, which aims to remove impurities or damaged parts in the valve through repeated flushing and detection, thereby restoring the sealing of the system. The following is a detailed description of the process: First, conduct a detailed analysis of the leak to determine its exact location, cause, and possible solutions. Ensure flushing equipment and leak detection equipment are in place and meet the vehicle manufacturer's specifications.

[0045] Next, flush all normally closed valves again, following the flushing process described previously. Ensure that the quality and quantity of the flushing fluid meet the requirements, and that the number of flushings is sufficient to remove possible impurities or residues. After the flushing is completed, confirm the flushing effect by visual inspection or other methods such as using an endoscope to ensure that there are no obvious impurities or residues inside the valve.

[0046] Then, after the flushing is completed, perform a valve body leak test on all normally closed valves according to the leak detection process described previously. Based on the results of the leak test, evaluate whether the system still has a leak problem. If the leak has been resolved, proceed to the next step; if the leak still exists, continue to iterate the process. If the leak is not resolved, repeat the flushing and leak detection steps. During the iteration process, the system status should be continuously monitored to ensure that no new leak problems occur. If new leaks or abnormal conditions are found, timely measures should be taken to deal with them. When the leak test results show that the system has passed, that is, there is no obvious leakage in all normally closed valves, it is confirmed that the leak problem has been resolved.

[0047] The method for preventing and controlling leakage of normally closed valves of a brake-by-wire system provided by an embodiment of the present invention receives a start filling signal from a filling device, and controls the filling device to fill brake fluid into the brake-by-wire system. After the filling is completed, in addition, after the filling is completed, the brake-by-wire system is controlled to close all its normally closed valves, request the brake-by-wire system to be pressurized, and flush all normally closed valves in sequence for a preset number of times. By flushing for a preset number of times, impurities, sediments or tiny particles inside the normally closed valve can be effectively removed, and foreign matter existing in the brake fluid or brake fluid transmission device during the filling process can be prevented from entering the normally closed valve, causing abnormal operation or leakage of the normally closed valve, thereby causing a fault in the brake-by-wire system. At the same time, after the flushing is completed, the filling device will request a leakage detection of the normally closed valve in the brake-by-wire system, and enter the next link after the leakage detection is qualified, to ensure that the foreign matter (if any) inside the normally closed valve of the brake-by-wire system is cleaned up, to prevent the normally closed valve of the brake-by-wire system from leaking, thereby ensuring that the sealing performance of the normally closed valve is always kept in a good state, thereby improving the reliability and stability of the entire brake-by-wire system. Moreover, by checking and closing the normally closed valve, adding brake fluid, and performing flushing and leak detection, this method can proactively prevent the occurrence of leaks, and take timely measures to repair leaks when they are found, thereby avoiding safety issues such as reduced braking performance or failure due to leaks.

[0048] In addition, timely flushing and testing can reduce component wear and corrosion caused by leakage, thereby extending the service life of the normally closed valve and its related components. This not only reduces maintenance costs, but also reduces downtime and production losses caused by replacing parts. The wire control brake system is an important part of vehicle safety. Through this method, it can also ensure that the wire control brake system can respond quickly and accurately in an emergency, providing sufficient braking force to ensure the safety of the vehicle and passengers.

[0049] The method for preventing and controlling leakage of normally closed valves in a brake-by-wire system provided by the embodiment of the present invention optimizes the filling strategy and method, systematizes and processes the flushing, filling and leakage detection steps, and makes the maintenance work more standardized and efficient. At the same time, through automated control and signal response, the complexity and error rate of manual operation are reduced, and the accuracy and reliability of maintenance work are improved.

[0050] The method for preventing and controlling leakage of normally closed valves in a brake-by-wire system provided by the embodiment of the present invention is not only applicable to quality inspection of new vehicles before they leave the factory, but also to regular maintenance and troubleshooting during vehicle use. By adjusting parameters such as the number of flushing times and the detection pressure, it can meet the needs of different vehicle models and working conditions, and has strong adaptability and flexibility.

[0051] In summary, this method has shown significant beneficial effects in preventing leakage of the normally closed valve of the wire control brake system, and is of great significance for improving the safety, reliability and economy of the vehicle.

[0052] In an optional embodiment, when there is no leakage in the brake-by-wire system described in S101 above, before controlling the filling device to fill the brake-by-wire system with brake fluid, the method further includes: S1001, controlling the brake-by-wire system to open a normally closed valve.

[0053] When the filling equipment is ready and sends a signal requesting the opening of the normally closed valves, the system receives the signal and responds by requesting the brake-by-wire system to open all its normally closed valves. This step is to ensure that a clear passage is formed between the brake-by-wire system and the filling equipment during the vacuuming process.

[0054] S1002: Control the filling device to evacuate the brake-by-wire system.

[0055] After receiving the command to open the normally closed valve, the brake-by-wire system executes the command and feeds back a signal that the normally closed valve has been opened. After receiving this signal or after a preset waiting time, the filling device requests a vacuum operation on the brake-by-wire system. The purpose of vacuuming is to remove the air, moisture and other non-condensable gases inside the brake-by-wire system, creating good conditions for subsequent brake fluid filling and sealing testing.

[0056] S1003. Control the leakage detection equipment to perform leakage detection on the brake-by-wire system.

[0057] When the filling equipment completes the vacuuming operation, it will send a vacuuming completion signal. After receiving the signal or waiting for a period of time, the system controls the leak detection equipment to perform a leak detection on the brake-by-wire system. The purpose of this step is to verify whether the brake-by-wire system maintains a good seal after vacuuming to ensure that no air or other gases re-enter the system.

[0058] The present invention can remove air, moisture and other impurities inside the brake-by-wire system through vacuuming operation, creating a purer environment for subsequent brake fluid filling. This helps to improve the filling quality of the brake fluid and reduce performance degradation or failure caused by impurities. Through leak detection, potential leaks in the brake-by-wire system can be discovered and repaired in time, thereby ensuring that the brake-by-wire system can maintain good sealing performance after the brake fluid is filled. This helps to prevent brake fluid leakage and ensure the normal operation of the brake-by-wire system. Through this series of preparation steps, it can be ensured that the brake-by-wire system is more stable and reliable in subsequent operations. This not only helps to improve the overall safety of the vehicle, but also reduces the maintenance cost and downtime caused by the failure of the brake-by-wire system. The present invention incorporates steps such as vacuuming and leak detection into the maintenance process, making the maintenance work more systematic and standardized. This helps to improve the efficiency and quality of maintenance work and reduce the risks brought by human operation.

[0059] In summary, steps S1001 to S1003 play a vital role in the prevention and control of leakage of normally closed valves in brake-by-wire systems. They lay a solid foundation for subsequent steps such as filling, flushing and leakage detection.

[0060] In an optional embodiment, before controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times as described in S103 above, the method further includes: S1021. Control the filling device to store the filling information and upload it to the associated device.

[0061] After completing the filling operation of the brake fluid, the filling device will automatically or according to the control store the relevant filling information. The filling information includes key parameters such as filling time, filling amount, filling speed, filling pressure, etc. After storage, the filling device will upload the filling information to the equipment or system associated with the wire control brake system. These associated devices may be the vehicle's control unit, data center or remote monitoring platform, etc., for subsequent data analysis, fault diagnosis and maintenance management.

[0062] S1022: Control the filling device to write a filling byte into the brake-by-wire system.

[0063] When the refueling device confirms that the refueling information has been successfully uploaded to the associated device, it will send an upload completion signal. After the system receives the signal or waits for a period of time, it will control the refueling device to write specific refueling bytes into the wire control brake system. These refueling bytes may be special codes used to identify the refueling status, record the refueling history, or verify the refueling information. The purpose of writing the refueling bytes is to ensure that the wire control brake system can accurately record the status and results of the refueling operation so that it can be verified and traced in subsequent operations and maintenance.

[0064] S1023, controlling the brake-by-wire system to feed back a filling byte writing completion signal to the filling device.

[0065] After receiving the instruction to write the refueling byte, the brake-by-wire system will execute the instruction and feedback the write completion signal to the refueling device. After receiving this signal, the refueling device can confirm that the refueling byte has been successfully written into the brake-by-wire system, thus completing the entire refueling information recording and verification process.

[0066] By storing and uploading the filling information, the present invention can ensure the accuracy and completeness of the information, and provide a reliable basis for subsequent data analysis, fault diagnosis and maintenance management. In addition, the writing and feedback mechanism of the filling bytes makes the filling operation of the wire control brake system traceable, and once a problem occurs, the specific filling operation can be quickly located and processed. By ensuring the accuracy of the filling information and the traceability of the system, the overall safety of the wire control brake system can be improved, and the safety hazards caused by improper filling or erroneous information can be reduced. Moreover, incorporating the recording and verification of the filling information into the maintenance process can make the maintenance work more systematic and standardized, and improve the efficiency and quality of the maintenance work.

[0067] In summary, steps S1021 to S1023 play a key role in the prevention and control of leakage of the normally closed valve of the brake-by-wire system. They ensure the accuracy of the filling information and the traceability of the system, thereby improving the safety and maintenance efficiency of the system.

[0068] In an optional embodiment, the step of controlling the brake-by-wire system to flush all normally closed valves for a preset number of times in sequence in S103 specifically includes the following steps: S1031, controlling the brake-by-wire system to pressurize to a first preset pressure.

[0069] When the brake fluid of the wire control brake system is filled to the specified amount and confirmed to be correct, the system will receive a filling completion signal. After receiving the filling completion signal or waiting for a period of time, the system will automatically pressurize the wire control brake system until the first preset pressure is reached. This pressure value is usually set according to the system design and performance requirements to ensure that the brake fluid can flow fully during the flushing process and achieve a cleaning effect.

[0070] S1032: Control the brake-by-wire system to flush all normally closed valves in sequence under the first preset pressure in a preset order.

[0071] Each normally closed valve is selected and flushed in turn according to a preset order, which is usually selected based on valve location, importance or other factors. At the first preset pressure, the brake fluid will flow through the normally closed valve, flushing the inside of the valve through high-speed flow and possible pressure changes to remove possible impurities, sediments or residues. This process helps keep the valve clean and unobstructed, preventing performance degradation due to clogging or wear.

[0072] In order to ensure the flushing effect, the above-mentioned control of the wire control brake system to pressurize and flush the steps will be repeated multiple times until the preset number of times is reached. The preset number of times is determined according to the system design and maintenance requirements, and is usually sufficient to ensure that all normally closed valves are fully cleaned. When the preset number of flushing times is reached, the system will stop the flushing process and may perform a series of self-tests or confirmation operations to ensure that the flushing effect meets the requirements.

[0073] The present invention can remove impurities and sediments inside the valve by flushing the normally closed valve, thereby improving the cleanliness and performance of the system. Flushing the normally closed valve can also prevent the valve from failing prematurely due to blockage or wear, thereby extending the service life of the entire wire control brake system. Flushing the normally closed valve can also prevent the occurrence of faults, and can reduce the cost and time cost of repairing the faults. A clean valve can ensure smooth flow of brake fluid, improve the response speed and braking effect of the wire control brake system, and enhance the safety performance of the vehicle.

[0074] In summary, the process described in S103 is an effective maintenance method for the wire control brake system, which ensures the cleanliness and stable performance of the wire control brake system by regularly flushing the normally closed valve.

[0075] In an optional embodiment, the control leakage detection device described in S104 performs valve body leakage detection on all normally closed valves in the brake-by-wire system, specifically comprising the following steps: S1041, controlling the brake-by-wire system to increase the pressure to a second preset pressure, and maintaining the pressure for a preset time.

[0076] First, set the second preset pressure and the third preset pressure according to the vehicle manufacturer's recommendations or the system maintenance manual. These two pressure values ​​are usually determined according to the vehicle model, usage conditions, and system requirements. Make sure that the leak detection equipment used for leak detection, such as pressure gauges, leak detectors, etc., has been connected to the wire control brake system and that the equipment has been calibrated and prepared in accordance with the manufacturer's requirements. Confirm through the system diagnostic tool or control unit (ECU) that the wire control brake system is in a stable state and all normally closed valves are closed.

[0077] When the brake-by-wire system has completed flushing all normally closed valves, a flushing completion signal is sent. After receiving the flushing completion signal, the system will first control the brake-by-wire system to slowly pressurize until the second preset pressure is reached. During the pressurization process, the pressure gauge reading should be closely monitored to ensure that the pressure is stable and does not exceed the second preset pressure. Maintain the second preset pressure for a period of time (usually ranging from a few minutes to a few hours) to observe whether the system has leaks.

[0078] S1042, control the leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system in a preset order under the second preset pressure. If there is valve body leakage in the normally closed valve under the second preset pressure, repeat the above normally closed valve flushing and normally closed valve leakage detection steps. If there is no valve body leakage in all normally closed valves under the second preset pressure, execute S1043.

[0079] During the pressure stabilization period, the system will perform valve body leak detection on all normally closed valves in a preset sequence. This usually involves monitoring pressure changes, flow changes, or other relevant parameters. During this time, the changes in the pressure gauge readings should be closely monitored, and leak detectors or other methods should be used to detect whether there are gas or liquid leaks in the system. Based on the observations, the leakage at the second preset pressure is recorded. If a leak is found, the location, size, and extent of the leak should be recorded. If there is no leakage at the second preset pressure, the leak detection at the third preset pressure is carried out.

[0080] S1043, controlling the brake-by-wire system to increase the pressure to a third preset pressure, and maintaining the pressure for a preset time.

[0081] If all normally closed valves have no leakage at the second preset pressure, the pressure will continue to be increased to the third preset pressure. At the third preset pressure, the pressure will also be kept stable for a period of time.

[0082] S1044. Control the leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system in a preset order under the third preset pressure.

[0083] During the pressure stabilization period, all normally closed valves are tested for body leakage again in the preset order. Based on the observations, the leakage at the third preset pressure is recorded. If a normally closed valve body leakage is detected at any preset pressure, i.e., the second preset pressure or the third preset pressure, an error signal or warning is triggered. To resolve the problem, the previous normally closed valve flushing step and leakage detection step are repeated. This process may be repeated until all normally closed valves are confirmed to be leak-free.

[0084] The present invention can timely discover and solve possible leakage problems in the system by performing valve body leakage detection under different preset pressures, thereby improving the sealing and performance of the system. The sealing of the wire control brake system is directly related to the safety of the vehicle. By ensuring that all normally closed valves are leak-free, the braking performance and overall safety of the vehicle can be improved. In addition, by performing valve body leakage detection, failures caused by leakage can be prevented, and the cost and time cost of repairing the failure can be reduced. Moreover, timely discovery and resolution of leakage problems can prevent system components from being damaged due to long-term pressure or corrosion, thereby extending the service life of the entire wire control brake system.

[0085] The above-mentioned second preset pressure in the present invention is greater than the third preset pressure. The high-pressure detection can simulate the pressure state of the system under extreme working conditions such as high load or emergency braking, which is helpful to find high-pressure leakage caused by material fatigue, aging of seals or improper installation. Potential problems that may cause system failure or safety accidents can be discovered in advance, so that timely measures can be taken to repair them. Performing low-pressure testing after high-pressure testing can further verify the sealing performance of the system under normal working conditions to ensure that no small leaks are missed. Performing high-pressure testing first can quickly screen out normally closed valves with serious leaks, avoiding wasting time and resources in subsequent low-pressure testing. For normally closed valves that pass the high-pressure test, performing low-pressure testing can further confirm their sealing performance and ensure the comprehensiveness and accuracy of the test. Low-pressure testing is a supplement and verification of the high-pressure test results, ensuring that the system can maintain good sealing and braking performance under various working conditions.

[0086] In summary, the process described in S104 is an effective maintenance method for the brake-by-wire system, which ensures the sealing and stable performance of the system by performing valve body leakage detection at different preset pressures.

[0087] In an optional embodiment, the method further includes: S106: When there is no valve body leakage in all normally closed valves under a third preset pressure, control the filling device to read the internal fault of the brake-by-wire system.

[0088] When it is detected that there is no valve body leakage in the normally closed valve under the third preset pressure, it means that the sealing or pressure holding ability of this part is normal. The next step is to further diagnose other possible faults inside the system. Once it is confirmed that there is no leakage, the system will send instructions to the filling device. The purpose of this instruction is to require the filling device to perform a series of operations so that it can read or detect fault information inside the brake-by-wire system. After receiving the instruction, the filling device reads the fault code stored inside the system through the diagnostic interface (such as the OBD-II interface). These fault codes are automatically generated by the ECU when a system abnormality is detected. The fault code includes information such as the specific location of the leak, fault code, fault timestamp, etc. In addition to the fault code, the filling device may also collect real-time operating data of the system, such as pressure sensor readings, actuator status, battery voltage, etc., for more in-depth analysis. After reading the internal fault information, the system or technicians will analyze this information. This includes: Identify fault type: Based on the fault code and real-time data, determine the specific type of fault, such as sensor failure, actuator failure, software problem or communication failure.

[0089] Locate the fault location: Combine the system structure and fault code information to try to locate the specific location where the fault occurs.

[0090] Assess the impact of failures: Analyze the potential impact of failures on system performance and safety.

[0091] Based on the results of fault analysis and diagnosis, a detailed repair plan is developed. This may include replacing faulty parts, calibrating sensors, updating software, or performing other necessary repair operations. Perform actual operations according to the developed repair plan, and retest the system after the repair is completed to ensure that the fault has been completely eliminated and the system has returned to normal working condition.

[0092] S107: Control the filling device to clear the internal fault of the brake-by-wire system.

[0093] After reading and analyzing the fault information, the system will instruct the filling device to clear the fault record inside the wire control brake system. This step is to prepare for subsequent repair work, ensure that the system can be restored to a clean state, and avoid old fault information interfering with the new diagnostic process.

[0094] S108: Control the filling device to write function configuration bytes into the brake-by-wire system.

[0095] After the filling device completes the fault clearing, it will send a fault clearing signal to the system. After receiving this signal or waiting for a period of time, the system will confirm to ensure that the fault information has been successfully cleared. After confirming that the fault has been cleared, the system will instruct the filling device to write the functional configuration bytes to the wire control brake system. These configuration bytes may contain system setting parameters, operating modes, calibration data, etc., which are critical to ensure that the system can operate as expected.

[0096] S109, controlling the filling device to read the parts and software version number of the wire control brake system. This step is to verify whether the current configuration of the system is consistent with the expectation and whether there are any software or parts that need to be updated.

[0097] The present invention can significantly reduce the risk of failure of the brake-by-wire system and improve the safety of vehicle driving through timely leakage detection and fault handling. Clearing internal faults and updating function configuration bytes can ensure that the brake-by-wire system always remains in the expected working state, improving the stability and reliability of the system. By reading and recording parts and software version numbers, the change history of the system can be easily tracked, providing an important basis for subsequent fault analysis and system upgrades. The present invention reduces the need for manual intervention through automated diagnosis and repair processes, improves maintenance efficiency, and reduces maintenance costs. Rapid fault handling and repair can shorten the time the vehicle is down due to a fault and enhance the user experience.

[0098] In summary, this process effectively solves the leakage problem of the wire control brake system through a series of automated steps, and improves the safety, stability and maintenance efficiency of the system.

[0099] Reference Figure 4The figure shows the flow direction of the brake fluid for vacuum filling of the vehicle offline of the present invention. Since the four normally closed valves only have filters at the oil inlet and no filters at the outlet, in order to prevent the foreign matter of the brake fluid and the transmission device from entering the four normally closed valves during the filling process, the present invention optimizes the filling strategy and method. By receiving the start filling signal of the filling device, the wire control brake system is controlled to close the four normally closed valves to prevent the foreign matter in the brake fluid or the brake fluid transmission device from entering the normally closed valves during the filling process, causing the normally closed valves to work abnormally or leak, thereby causing system failure. During filling, if the four normally closed valves are not closed, the brake fluid and impurities in the transmission device may enter the normally closed valves, affecting the normal operation of the normally closed valves. The filling device is connected to the oil pot port of the brake oil pot of the wire control brake system, and the filling device sends a command to request the wire control brake system to open the solenoid valve, and then the filling device starts to vacuum fill the brake fluid. After the filling is completed, the filling equipment will request the brake-by-wire system to pressurize. The brake-by-wire system controls the motor to pressurize. When the pressure is pressurized to the first preset pressure, the normally closed valve will be controlled to open, and the four normally closed valves will be flushed 35 times in sequence. After the flushing is completed, the filling equipment will request the brake-by-wire system to perform high-pressure and low-pressure leakage detection on the four normally closed valves. After the leakage detection is qualified, it will enter the next link. Figure 2 and Figure 4 Among them, 10 and 11 are solenoid valves, 15-18 are pressure limiting valves, 19-22 are normally closed valves, and 23 is a motor.

[0100] Before the above-mentioned filling equipment and the brake-by-wire system interact, first, the filling equipment needs to identify and connect to the brake-by-wire system. This is usually achieved through a physical interface such as a cable connection or a wireless interface such as Bluetooth, Wi-Fi, etc. After the connection is established, a preliminary communication test will be performed between the devices to ensure that the connection is stable and reliable. The filling equipment and the brake-by-wire system need to follow the same communication protocol. These protocols define key parameters such as data format, transmission rate, verification method, etc. to ensure that both parties can correctly understand and process the data sent by each other.

[0101] Reference Figure 5 As shown in the figure, before data transmission begins, the filling device usually initiates a handshake signal as the sender. This signal is sent to the wire control brake system through the communication interface to confirm whether the other party is ready to receive data. The handshake signal usually contains a series of predefined signals or messages to indicate different states or requests. For example, it may include a signal requesting synchronization, a signal confirming that the receiver is ready, etc.

[0102] As the receiver, the brake-by-wire system will parse and process the handshake signal after receiving it. If it is ready to receive data, it will send a confirmation signal to the filling device, indicating that data transmission can begin. After confirming receipt, the brake-by-wire system may also send some status information to the filling device so that the filling device can understand the current system status or configuration.

[0103] Once the handshake is successful and both parties are confirmed to be ready, data transmission can begin between the filling device and the wire control brake system. This includes the filling device sending control instructions, parameter settings, fault diagnosis information and other data to the wire control brake system. During the data transmission process, both parties need to keep in sync and may use a verification mechanism to ensure the integrity and correctness of the data.

[0104] Reference Figure 5 and Figure 6 As shown, the control process of the above-mentioned filling equipment and wire control brake system is: a) When the filling equipment is ready, the control wire brake system is instructed to open the normally closed valve.

[0105] b) After receiving the command to open the normally closed valve, the brake-by-wire system executes the command and feeds back a signal indicating that the normally closed valve has been opened.

[0106] c) After receiving the normally closed valve opening signal of the wire control brake system or waiting for a period of time, the filling device is controlled to evacuate the wire control brake system. When the filling device completes the vacuuming operation, a vacuuming completion signal will be issued.

[0107] d) After receiving the vacuuming completion signal or waiting for a period of time, the leak detection device is controlled to perform leak detection on the brake-by-wire system.

[0108] e) When there is no leakage in the brake-by-wire system, controlling the filling device to fill the brake fluid into the brake-by-wire system.

[0109] f) Control the filling device to store the filling information and upload it to the associated device. When the filling device confirms that the filling information has been successfully uploaded to the associated device, it will send an upload completion signal.

[0110] g) After receiving the upload completion signal or waiting for a period of time, the control filling device writes the filling byte into the wire control brake system.

[0111] h) Control the brake-by-wire system to feed back a filling byte writing completion signal to the filling device.

[0112] i) Control the brake-by-wire system to close all normally closed valves. After receiving the command to close the normally closed valves, the brake-by-wire system executes the command and feeds back a signal that the normally closed valves have been closed.

[0113] j) controlling the brake-by-wire system to pressurize to a first preset pressure.

[0114] k) The control-by-wire brake system flushes the left front normally closed valve → the right rear normally closed valve → the right front normally closed valve → the left rear normally closed valve in sequence according to a preset order under a first preset pressure.

[0115] l) Repeat steps j and k above until the preset number of times is reached. When the brake-by-wire system completes flushing of all normally closed valves, a flushing completion signal is sent.

[0116] m) controlling the brake-by-wire system to increase the pressure to a second preset pressure and maintaining the pressure for a preset time.

[0117] n) Control the brake-by-wire control system to perform valve body leakage detection on the left front normally closed valve → the right rear normally closed valve → the right front normally closed valve → the left rear normally closed valve in sequence under the second preset pressure. If the normally closed valve has leakage under the second preset pressure, return to the above step j. If all normally closed valves have no valve body leakage under the second preset pressure, execute step o.

[0118] o) controlling the brake-by-wire system to pressurize to a third preset pressure and maintaining the pressure for a preset time.

[0119] p) Control the brake-by-wire system to perform valve body leakage detection on the left front normally closed valve → the right rear normally closed valve → the right front normally closed valve → the left rear normally closed valve in sequence under the third preset pressure. If the normally closed valve has leakage under the third preset pressure, return to the above step j. If all normally closed valves have no leakage under the third preset pressure, execute step q.

[0120] q) Control the filling device to read the internal fault of the wire control brake system. After receiving the command, the filling device reads the fault code stored in the system through the diagnostic interface (such as OBD-II interface).

[0121] r) Control the filling equipment to clear the internal fault of the wire control brake system.

[0122] s) Control the filling device to write the function configuration bytes to the wire control brake system.

[0123] t) Control the filling equipment to read the parts and software version number of the wire control brake system.

[0124] The first preset pressure, the second preset pressure, the third preset pressure and the preset number of times can be set according to actual needs and are not specifically limited here. Figure 6 The various pressures and flushing times are only examples.

[0125] The device for preventing and controlling leakage of the normally closed valve of the wire control brake system provided by the present invention is described below. The device for preventing and controlling leakage of the normally closed valve of the wire control brake system described below and the method for preventing and controlling leakage of the normally closed valve of the wire control brake system described above can be referenced to each other.

[0126] Reference Figure 7 As shown, the device comprises: A filling module 201, configured to control a filling device to fill the brake fluid into the brake-by-wire system when there is no leakage in the brake-by-wire system; A closing module 202, used to control the brake-by-wire system to close all normally closed valves; A flushing module 203, used to control the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times; A detection module 204, configured to control a leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system; The judgment module 205 is used to determine that the leakage detection is qualified when there is no valve body leakage in all normally closed valves.

[0127] Figure 8 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 8 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the above-mentioned method for preventing and controlling leakage of the normally closed valve of the wire control brake system.

[0128] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0129] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the above-mentioned method for preventing and controlling leakage of a normally closed valve of a wire control brake system.

[0130] On the other hand, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the above-mentioned method for preventing and controlling leakage of a normally closed valve of a wire control brake system.

[0131] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing and controlling leakage of a normally closed valve of a wire control brake system, characterized in that: include: In the case where there is no leakage in the wire control brake system, controlling the filling device to fill the wire control brake system with brake fluid; Controlling the brake-by-wire system to close all normally closed valves; Controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times; Controlling the leakage detection equipment to perform valve body leakage detection on all normally closed valves in the brake-by-wire system; When there is no valve body leakage in all normally closed valves, it is determined that the leakage test is qualified.

2. The method for preventing and controlling leakage of a normally closed valve of a wire control brake system according to claim 1, characterized in that: Controlling the brake-by-wire system to flush all normally closed valves for a preset number of times in sequence includes: Controlling the brake-by-wire system to pressurize to a first preset pressure; controlling the brake-by-wire system to flush all normally closed valves in sequence according to a preset order under the first preset pressure; The above steps of controlling the brake-by-wire system to pressurize and flush the normally closed valve are repeated until a preset number of times is reached.

3. The method for preventing and controlling leakage of a normally closed valve of a wire control brake system according to claim 1, characterized in that: The control leakage detection device performs valve body leakage detection on all normally closed valves in the wire control brake system, including: Controlling the brake-by-wire system to pressurize to a second preset pressure and stabilizing the pressure for a preset time; controlling the leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system in a preset order under the second preset pressure; When all normally closed valves have no valve body leakage at the second preset pressure, controlling the brake-by-wire system to be pressurized to a third preset pressure and stabilizing the pressure for a preset time; The control leakage detection device performs valve body leakage detection on all normally closed valves in the wire control brake system in a preset order under the third preset pressure; wherein the second preset pressure is greater than the third preset pressure.

4. The method for preventing and controlling leakage of a normally closed valve of a wire control brake system according to claim 1, characterized in that: In the case where there is no leakage in the brake-by-wire system, before controlling the filling device to fill the brake-by-wire system with brake fluid, the method further includes: Controlling the brake-by-wire system to open a normally closed valve; controlling the filling device to evacuate the brake-by-wire system; Control the leak detection equipment to perform leak detection on the brake-by-wire system.

5. The method for preventing and controlling leakage of a normally closed valve of a wire control brake system according to claim 1, characterized in that: Before controlling the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times, the method further includes: Control the filling device to store the filling information and upload it to the associated device; Controlling the filling device to write a filling byte into the brake-by-wire system; The brake-by-wire system is controlled to feed back a filling byte writing completion signal to the filling device.

6. The method for preventing and controlling leakage of a normally closed valve of a brake-by-wire system according to claim 3, characterized in that: The method further comprises: When all normally closed valves have no valve body leakage under the third preset pressure, controlling the filling device to read the internal fault of the brake-by-wire system; Controlling the filling device to clear the internal fault of the brake-by-wire system; Controlling the filling device to write function configuration bytes into the brake-by-wire system; The filling device is controlled to read the parts and software version number of the wire control brake system.

7. A device for preventing leakage of a normally closed valve of a wire control brake system, characterized in that: include: A filling module, used for controlling the filling device to fill the brake fluid into the brake-by-wire system when there is no leakage in the brake-by-wire system; A closing module, used for controlling the brake-by-wire system to close all normally closed valves; A flushing module, used to control the brake-by-wire system to flush all normally closed valves in sequence for a preset number of times; A detection module, used for controlling a leakage detection device to perform valve body leakage detection on all normally closed valves in the brake-by-wire system; The judgment module is used to determine that the leakage detection is qualified when there is no valve body leakage in all normally closed valves.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for preventing and controlling leakage of the normally closed valve of the wire control brake system as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for preventing and controlling leakage of a normally closed valve of a brake-by-wire system as claimed in any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for preventing and controlling leakage of a normally closed valve of a brake-by-wire system as claimed in any one of claims 1 to 6 is implemented.

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