A method, system, equipment, and medium for diagnosing multiple brake pressures of a wheel.

Abstract

This invention provides a method, system, device, and medium for diagnosing various brake pressures on aircraft wheels. The method analyzes the failure modes and corresponding pressure anomalies of the brake channels to identify the main factors causing tire blowouts. Monitoring strategies are then set for pressure over-limit, pressure deviation, and system residual pressure, among the main factors causing tire blowouts. By monitoring the final pressure output state of the brake channels through these strategies, the existence of brake faults can be diagnosed, effectively preventing tire blowouts and improving system safety.

Description

Technical Field

[0001] This invention belongs to the field of wheel brake control technology, specifically relating to a method, system, equipment, and medium for diagnosing various brake pressures of a wheel. Background Technology

[0002] Aircraft brake control is primarily used to ensure the safety and heading consistency of aircraft during landing braking and taxiing under various runway conditions, and to automatically adjust brake pressure to prevent wheel slippage or even tire blowouts. A tire blowout can cause the aircraft to yaw, especially at high speeds, potentially leading to runway overrun and serious accidents. Tire debris can also damage the fuselage, causing secondary damage. Therefore, tire blowouts are a serious threat to aviation safety, requiring thorough analysis of potential causes during system design and the implementation of effective preventative measures.

[0003] Currently, mainstream aircraft wheel braking control systems typically employ fly-by-wire braking systems, which consist of two parts: a hydraulic system and an electrical control system. In the hydraulic system, shut-off valves control the flow of hydraulic fluid, while servo valves regulate the fluid flow. The electrical system, based on braking commands and wheel speed, controls the shut-off and servo valves of the hydraulic system, thereby converting electro-hydraulic signals and regulating the braking pressure applied to the wheels to achieve braking and anti-skid operation.

[0004] When braking pressure is too high and the wheels lock up, the friction between the tire and the ground changes from rolling friction to sliding friction, causing slippage. Severe slippage can lead to tire damage and a blowout. Therefore, it is clear that braking pressure is the direct cause of wheel blowouts.

[0005] Both hydraulic system malfunctions and electrical control system malfunctions can cause abnormal brake pressure, leading to tire blowouts. Existing fault detection methods only detect the electrical status of the shut-off valve and servo valve control coils, but cannot detect abnormal states such as valve jamming or valve drift. They cannot cover all fault modes that may cause tire blowouts and cannot effectively prevent tire blowouts from occurring. Summary of the Invention

[0006] To address the technical problem in existing technologies where tire blowout detection based on the electrical state of valves in the braking system fails to detect braking problems caused by mechanical faults in the valves themselves, thus failing to effectively prevent tire blowouts, this invention provides a method, system, device, and medium for diagnosing various brake pressures of a wheel.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect, embodiments of this disclosure provide a method for diagnosing various brake pressures on a wheel, comprising the following steps:

[0009] Step S1: Analyze the failure modes of the brake channel and the corresponding abnormal pressure conditions to obtain the main factors of tire blowout. The main factors include excessive pressure, pressure deviation and residual pressure in the system.

[0010] Step S2: For the pressure exceeding the limit, a maximum braking pressure is preset, and the actual braking pressure is periodically detected. If the pressure exceeds the maximum braking pressure, a brake malfunction is diagnosed.

[0011] Step S3: For the pressure deviation, a preset pressure deviation threshold is set. In the non-braking state, the actual braking pressure is detected. If the difference between the actual braking pressure and the expected pressure is greater than the pressure deviation threshold, a brake failure is diagnosed.

[0012] Step S4: For the system residual pressure, a preset system residual pressure threshold is set. When there is no braking command, the actual braking pressure is periodically detected. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

[0013] Furthermore, the fault modes include servo valve spool sticking, shut-off valve spool sticking, servo valve drift, abnormal braking quantity, servo valve coil open circuit or short circuit, and shut-off valve coil open circuit or short circuit.

[0014] If the fault mode is servo valve spool sticking, the corresponding abnormal pressure conditions include:

[0015] The valve core jamming caused the servo valve to become unadjustable and output the maximum oil source pressure, resulting in the brake pressure exceeding the limit;

[0016] The valve core is stuck and cannot return to its original position, resulting in residual braking pressure in the system during the release process, which serves as residual pressure in the system.

[0017] The valve core is stuck and cannot be opened, resulting in no pressure during braking.

[0018] If the fault mode is shut-off valve spool sticking, the corresponding abnormal pressure conditions include:

[0019] The valve core is stuck and cannot return to its original position, resulting in residual pressure in the system during the brake release process;

[0020] The valve core is stuck and cannot be opened, resulting in no pressure during braking.

[0021] If the fault mode is servo valve drift, the corresponding abnormal pressure conditions include:

[0022] The actual braking pressure deviates from the expected pressure during braking.

[0023] If the fault mode is abnormal braking amount, the corresponding abnormal pressure conditions include:

[0024] Abnormal brake output caused by brake control unit hardware results in excessive brake pressure, pressure deviation, or residual pressure in the system.

[0025] Abnormal brake output caused by brake control software leads to excessive brake pressure, pressure deviation, or residual pressure in the system.

[0026] If the fault mode is an open circuit or short circuit in the servo valve coil, the corresponding abnormal pressure conditions include:

[0027] The servo valve was fully open, causing the brake pressure to exceed the limit.

[0028] With the servo valve fully closed, there is no pressure during braking.

[0029] If the fault mode is an open circuit or short circuit in the shut-off valve coil, the corresponding abnormal pressure conditions include:

[0030] The shut-off valve is normally open, and residual pressure may occur in the system during the release process.

[0031] The shut-off valve is normally closed, and there is no pressure during braking.

[0032] In the corresponding abnormal pressure conditions, pressure over-limit, pressure deviation, and system residual pressure were selected as the main factors for tire blowout.

[0033] Furthermore, the maximum braking pressure is the sum of the maximum allowable braking pressure value, the servo valve pressure control accuracy, and the sensor fluctuation error. A pressure over-limit filtering period is preset. If the actual braking pressure detected during the pressure over-limit filtering period continues for a preset time, it is diagnosed as a brake malfunction.

[0034] Furthermore, the servo valve pressure control accuracy is ±1 MPa, the pressure over-limit filtering period is 1 second, and if the actual brake pressure continues for a preset time of 0.6 seconds during the pressure over-limit filtering period, it is diagnosed as a brake malfunction.

[0035] Furthermore, the non-braking state includes the calculation of the desired pressure based on the servo valve control current before the braking system is powered on or before landing, and the actual braking pressure is collected by the braking control software within a preset pressure deviation filtering period. The difference between the actual braking pressure and the desired pressure is compared with a pressure deviation threshold. If the actual braking pressure continues for a preset time within the pressure deviation filtering period, a braking malfunction is diagnosed.

[0036] Furthermore, the pressure deviation threshold is obtained based on the control accuracy of the servo valve, as well as the fluctuation of the system oil source and the acquisition error. The pressure deviation threshold is ±2 MPa, and the pressure deviation filtering period is 1 second. If the actual brake pressure continues for a preset time of 0.8 seconds within the 1 second pressure deviation filtering period, it is diagnosed as a brake failure.

[0037] Furthermore, if, 3 seconds after the absence of a braking command or the cancellation of a braking command, within 2 seconds of the preset system residual pressure filtering period, the actual braking pressure is collected for more than 1 second and is greater than the system residual pressure threshold of 3 MPa, then a braking fault is diagnosed.

[0038] In a second aspect, embodiments of this disclosure provide a system for diagnosing various brake pressures on a wheel, comprising:

[0039] The analysis unit is configured to analyze the failure modes of the brake channel and the corresponding pressure anomalies to obtain the main factors of tire blowout, including pressure over-limit, pressure deviation and system residual pressure.

[0040] The pressure over-limit judgment unit is configured to, for the pressure over-limit, preset a maximum braking pressure, periodically detect the actual braking pressure, and if it exceeds the maximum braking pressure, diagnose a brake failure.

[0041] The pressure deviation judgment unit is configured to preset a pressure deviation threshold for the pressure deviation, detect the actual brake pressure in a non-braking state, and diagnose a brake malfunction if the difference between the actual brake pressure and the expected pressure is greater than the pressure deviation threshold.

[0042] The system residual pressure judgment unit is configured to preset a system residual pressure threshold for the system residual pressure, and periodically detect the actual braking pressure when there is no braking command. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

[0043] In a third aspect, embodiments of this disclosure provide an electronic device, characterized in that the electronic device comprises:

[0044] At least one processor; and,

[0045] The memory is communicatively connected to the at least one processor; wherein,

[0046] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform various methods for diagnosing the brake pressure of the wheel.

[0047] In a fourth aspect, embodiments of this disclosure provide a non-transitory computer-readable storage medium, characterized in that the non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method for diagnosing various brake pressures of the said wheel.

[0048] Compared with the prior art, the present invention has the following beneficial technical effects:

[0049] This invention provides a method, system, device, and medium for diagnosing various brake pressures on aircraft wheels. The method analyzes the fault modes and corresponding pressure anomalies in the brake channels to identify the main factors contributing to wheel blowouts. Monitoring strategies are then established for pressure over-limit, pressure deviation, and system residual pressure, among these main factors. By monitoring the final pressure output state of the brake channels, the method diagnoses the presence of brake faults, effectively preventing wheel blowouts and improving system safety. This invention addresses the problem of traditional fault detection methods that only test the electrical characteristics of servo valves and shut-off valves to determine their status. However, electrical characteristics cannot reflect the mechanical state of the valve core. This leads to situations where electrical testing shows both the servo valve and shut-off valve are normal, but the servo valve output exceeds the upper limit of braking pressure due to valve core jamming, and is not adjustable. Similarly, electrical testing cannot detect valve drift and residual pressure. Valve drift can cause prolonged tire drag at low speeds, eventually leading to tire breakage, while residual pressure can prevent the wheels from rolling sufficiently during landing, causing slippage and a blowout. This method targets the main factors causing tire blowouts by monitoring the final pressure output state of the brake channel through a monitoring strategy. It can bypass electrical testing and directly determine whether there is a brake malfunction, making the detection method simpler and more reliable. Attached Figure Description

[0050] Figure 1 A flowchart 100 illustrates a method for diagnosing multiple brake pressures on a wheel according to an embodiment of the present disclosure;

[0051] Figure 2 A diagram of an apparatus for diagnosing multiple brake pressures on a wheel, according to an embodiment of the present disclosure, is shown. Detailed Implementation

[0052] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0053] Figure 1 A flowchart 100 of a method for diagnosing multiple brake pressures of a wheel, as shown in the first embodiment of this disclosure, is illustrated. Figure 1 As shown, it includes the following steps:

[0054] In step S101, the failure modes of the brake channel and the corresponding abnormal pressure conditions are analyzed to obtain the main factors of tire blowout. The main factors include pressure over-limit, pressure deviation and system residual pressure.

[0055] Specifically, the fault modes include servo valve spool sticking, shut-off valve spool sticking, servo valve drift, abnormal braking quantity, servo valve coil open circuit or short circuit, and shut-off valve coil open circuit or short circuit.

[0056] If the fault mode is servo valve spool sticking, the corresponding abnormal pressure conditions include:

[0057] The valve core jamming caused the servo valve to become unadjustable and output the maximum oil source pressure, resulting in the brake pressure exceeding the limit;

[0058] The valve core is stuck and cannot return to its original position, resulting in residual braking pressure in the system during the release process, which serves as residual pressure in the system.

[0059] The valve core is stuck and cannot be opened, resulting in no pressure during braking.

[0060] If the fault mode is shut-off valve spool sticking, the corresponding abnormal pressure conditions include:

[0061] The valve core is stuck and cannot return to its original position, resulting in residual pressure in the system during the brake release process;

[0062] The valve core is stuck and cannot be opened, resulting in no pressure during braking.

[0063] If the fault mode is servo valve drift, the corresponding abnormal pressure conditions include:

[0064] The actual braking pressure deviates from the expected pressure during braking.

[0065] If the fault mode is abnormal braking amount, the corresponding abnormal pressure conditions include:

[0066] Abnormal brake output caused by brake control unit hardware results in excessive brake pressure, pressure deviation, or residual pressure in the system.

[0067] Abnormal brake output caused by brake control software leads to excessive brake pressure, pressure deviation, or residual pressure in the system.

[0068] If the fault mode is an open circuit or short circuit in the servo valve coil, the corresponding abnormal pressure conditions include:

[0069] The servo valve was fully open, causing the brake pressure to exceed the limit.

[0070] With the servo valve fully closed, there is no pressure during braking.

[0071] If the fault mode is an open circuit or short circuit in the shut-off valve coil, the corresponding abnormal pressure conditions include:

[0072] The shut-off valve is normally open, and residual pressure may occur in the system during the release process.

[0073] The shut-off valve is normally closed, and there is no pressure during braking.

[0074] Table 1 shows the main factors for tire blowout in the corresponding abnormal pressure conditions, including excessive pressure, pressure deviation, and residual system pressure.

[0075] Table 1. Relationship between failure modes and pressure anomalies

[0076]

[0077] It should be noted that the servo valve is responsible for precisely regulating the brake pressure. Based on the current commands from the electronic brake control unit, it continuously and proportionally controls the pressure and flow of the output hydraulic oil, thereby achieving precise control of the braking force, such as anti-slip control and smooth deceleration. The shut-off valve is responsible for on / off control and plays a safety role. The shut-off valve is typically an on / off type valve used to connect or disconnect the hydraulic supply to the brake servo valve. When the brake needs to be locked or an abnormality is detected in the servo valve, it quickly cuts off the hydraulic pressure to prevent accidental braking or hydraulic leakage. A stuck valve core may result in no pressure supply (no brake) or failure to shut off (brake cannot be released); a coil malfunction will cause the shut-off valve to not act according to commands.

[0078] Next, proceed to step S102.

[0079] In step S102, for the pressure exceeding the limit, a maximum braking pressure is preset, and the actual braking pressure is periodically detected. If the pressure exceeds the maximum braking pressure, a brake malfunction is diagnosed.

[0080] Specifically, the maximum braking pressure is the sum of the maximum allowable braking pressure value, the servo valve pressure control accuracy, and the sensor fluctuation error. A pressure over-limit filtering period is preset. If the actual braking pressure detected during the pressure over-limit filtering period continues for a preset time, it is diagnosed as a brake malfunction.

[0081] In this embodiment, the maximum pressure of the brake system oil source is 21 MPa, the maximum allowable pressure of the wheel brake is 12.8 MPa, and the pressure control accuracy of the servo valve is ±1 MPa. The initial maximum allowable brake pressure is determined to be 13.8 MPa. Considering the fluctuation of the system oil source pressure and the sensor error, the final maximum allowable brake pressure is determined to be 14 MPa. At any time, if the detected actual brake pressure is greater than the final determined maximum allowable brake pressure, and if the actual brake pressure continues for a preset time of 0.6 seconds within 1 second of the pressure over-limit filtering period, a brake failure is diagnosed.

[0082] Next, proceed to step S103.

[0083] In step S103, for the pressure deviation, a preset pressure deviation threshold is set. In the non-braking state, the actual braking pressure is detected. If the difference between the actual braking pressure and the expected pressure is greater than the pressure deviation threshold, a brake malfunction is diagnosed.

[0084] Specifically, the non-braking state includes the period before the braking system is powered on or before landing. Under the premise of ensuring that the system oil supply is normal, the desired pressure is calculated based on the servo valve control current. The actual braking pressure is collected by the braking control software within a preset pressure deviation filtering period. The difference between the actual braking pressure and the desired pressure is compared with the pressure deviation threshold. If the actual braking pressure continues for a preset time within the pressure deviation filtering period, a braking malfunction is diagnosed.

[0085] In this embodiment, the pressure deviation threshold is obtained based on the control accuracy of the servo valve, as well as the fluctuation of the system oil source and the acquisition error. The pressure deviation threshold is ±2 MPa, and the pressure deviation filtering period is 1 second. If the actual brake pressure lasts for a preset time of 0.8 seconds within the 1 second pressure deviation filtering period, it is diagnosed as a brake failure.

[0086] Next, proceed to step S104.

[0087] In step S104, for the system residual pressure, a preset system residual pressure threshold is set. When there is no braking command, the actual braking pressure is periodically detected. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

[0088] Specifically, in this embodiment, if, 3 seconds after the absence of a braking command or the cancellation of a braking command, within a 2-second preset system residual pressure filtering period, the actual braking pressure is collected and remains above the system residual pressure threshold of 3 MPa for more than 1 second, then a brake malfunction is diagnosed. It should be noted that the system residual pressure threshold is set based on the maximum residual pressure value that, when residual pressure exists, prevents the wheel from bursting while sliding under that pressure, or the maximum residual pressure that significantly affects the wheel, such as situations where the frictional force on the wheel surface is extremely high, leading to significant wear or deformation of the wheel surface.

[0089] A second embodiment of the present invention also provides a system for diagnosing various brake pressures of a wheel, comprising:

[0090] The analysis unit is configured to analyze the failure modes of the brake channel and the corresponding pressure anomalies to obtain the main factors of tire blowout, including pressure over-limit, pressure deviation and system residual pressure.

[0091] The pressure over-limit judgment unit is configured to, for the pressure over-limit, preset a maximum braking pressure, periodically detect the actual braking pressure, and if it exceeds the maximum braking pressure, diagnose a brake failure.

[0092] The pressure deviation judgment unit is configured to preset a pressure deviation threshold for the pressure deviation, detect the actual brake pressure in a non-braking state, and diagnose a brake malfunction if the difference between the actual brake pressure and the expected pressure is greater than the pressure deviation threshold.

[0093] The system residual pressure judgment unit is configured to preset a system residual pressure threshold for the system residual pressure, and periodically detect the actual braking pressure when there is no braking command. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

[0094] A third embodiment of the present invention also provides an electronic device, the electronic device comprising:

[0095] At least one processor; and,

[0096] The memory is communicatively connected to the at least one processor; wherein,

[0097] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform a method for diagnosing various brake pressures of the wheel in any of the foregoing embodiments.

[0098] The fourth embodiment of the present invention also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the method for diagnosing various brake pressures of a wheel as described in any of the foregoing embodiments.

[0099] The fifth embodiment of the present invention also provides a computer program product, which includes a computing program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform a method for diagnosing multiple brake pressures of a wheel according to any of the foregoing embodiments.

[0100] Figure 2 The illustration shows a method or device 1000 implementing an embodiment of the present invention. In some embodiments, more or fewer devices may be included than illustrated. In some embodiments, it may be implemented using a single or multiple devices. In some embodiments, it may be implemented using cloud-based or distributed devices.

[0101] like Figure 2As shown, device 1000 includes a processor 1001 for performing various appropriate operations and processes based on programs and / or data stored in read-only memory (ROM) 1002 or programs and / or data loaded from storage portion 1008 into random access memory (RAM) 1003. Processor 1001 may be a multi-core processor or may contain multiple processors. In some embodiments, processor 1001 may include a general-purpose main processor and one or more special coprocessors, such as a central processing unit (CPU), graphics processing unit (GPU), neural network processor (NPU), digital signal processor (DSP), etc. Various programs and data required for the operation of device 1000 are also stored in RAM 1003. Processor 1001, ROM 1002, and RAM 1003 are interconnected via bus 1004. Input / output (I / O) interface 1005 is also connected to bus 1004.

[0102] The processor and memory described above are used together to execute programs stored in the memory. When the program is executed by a computer, it can implement the methods, steps, or functions described in the above embodiments.

[0103] The following components are connected to I / O interface 1005: an input section 1006 including a keyboard, mouse, touchscreen, etc.; an output section 1007 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1008 including a hard disk, etc.; and a communication section 1009 including a network interface card such as a LAN card, modem, etc. The communication section 1009 performs communication processing via a network such as the Internet. A drive 1010 is also connected to I / O interface 1005 as needed. A removable medium 1011, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 1010 as needed so that computer programs read from it can be installed into storage section 1008 as needed. Figure 2 The diagram only shows a portion of the components and does not imply that the device 1000 only includes... Figure 2 The components shown.

[0104] The systems, devices, modules, or units described in the above embodiments can be implemented by a computer or its associated components. The computer may be, for example, a mobile terminal, smartphone, personal computer, laptop computer, in-vehicle human-machine interface device, personal digital assistant, media player, navigation device, game console, tablet computer, wearable device, smart TV, Internet of Things system, smart home, industrial computer, server, or a combination thereof.

[0105] Although not shown, in this embodiment of the invention, a computer-readable storage medium is provided having a computer program / instruction stored thereon, which, when executed by a processor, implements the method for diagnosing various brake pressures of the wheel as described in the embodiment.

[0106] Storage media in embodiments of the present invention include articles that are permanent and non-permanent, removable and non-removable, capable of storing information by any method or technology. Examples of storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0107] Although not shown, embodiments of the present invention also provide a computer program product, including: a computer program / instructions that, when executed by a processor, implement the method for diagnosing various brake pressures of a wheel as described in the embodiments.

[0108] The methods, programs, systems, apparatuses, etc., in embodiments of the present invention can be executed or implemented in one or more networked computers, or practiced in a distributed computing environment. In the embodiments of this specification, in these distributed computing environments, tasks can be performed by remote processing devices connected via a communication network.

Claims

1. A method for diagnosing multiple brake pressures on a wheel, characterized in that, Includes the following steps: Step S1: Analyze the failure modes of the brake channel and the corresponding abnormal pressure conditions to obtain the main factors of tire blowout. The main factors include excessive pressure, pressure deviation and residual pressure in the system. Step S2: For the pressure exceeding the limit, a maximum braking pressure is preset, and the actual braking pressure is periodically detected. If the pressure exceeds the maximum braking pressure, a brake malfunction is diagnosed. Step S3: For the pressure deviation, a preset pressure deviation threshold is set. In the non-braking state, the actual braking pressure is detected. If the difference between the actual braking pressure and the expected pressure is greater than the pressure deviation threshold, a brake failure is diagnosed. Step S4: For the system residual pressure, a preset system residual pressure threshold is set. When there is no braking command, the actual braking pressure is periodically detected. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

2. The method for diagnosing various brake pressures of a wheel according to claim 1, characterized in that, The fault modes include servo valve core jamming, shut-off valve core jamming, servo valve drift, abnormal braking quantity, servo valve coil open circuit or short circuit, and shut-off valve coil open circuit or short circuit. If the fault mode is servo valve spool sticking, the corresponding abnormal pressure conditions include: The valve core jamming caused the servo valve to become unadjustable and output the maximum oil source pressure, resulting in the brake pressure exceeding the limit; The valve core is stuck and cannot return to its original position, resulting in residual braking pressure in the system during the release process, which serves as residual pressure in the system. The valve core is stuck and cannot be opened, resulting in no pressure during braking. If the fault mode is shut-off valve spool sticking, the corresponding abnormal pressure conditions include: The valve core is stuck and cannot return to its original position, resulting in residual pressure in the system during the brake release process; The valve core is stuck and cannot be opened, resulting in no pressure during braking. If the fault mode is servo valve drift, the corresponding abnormal pressure conditions include: The actual braking pressure deviates from the expected pressure during braking. If the fault mode is abnormal braking amount, the corresponding abnormal pressure conditions include: Abnormal brake output caused by brake control unit hardware results in excessive brake pressure, pressure deviation, or residual pressure in the system. Abnormal brake output caused by brake control software leads to excessive brake pressure, pressure deviation, or residual pressure in the system. If the fault mode is an open circuit or short circuit in the servo valve coil, the corresponding abnormal pressure conditions include: The servo valve was fully open, causing the brake pressure to exceed the limit. With the servo valve fully closed, there is no pressure during braking. If the fault mode is an open circuit or short circuit in the shut-off valve coil, the corresponding abnormal pressure conditions include: The shut-off valve is normally open, and residual pressure may occur in the system during the release process. The shut-off valve is normally closed, and there is no pressure during braking. In the corresponding abnormal pressure conditions, pressure over-limit, pressure deviation, and system residual pressure were selected as the main factors for tire blowout.

3. The method for diagnosing various brake pressures of a wheel according to claim 1, characterized in that, The maximum braking pressure is the sum of the maximum allowable braking pressure value, the servo valve pressure control accuracy, and the sensor fluctuation error. A pressure over-limit filtering period is preset. If the actual braking pressure detected during the pressure over-limit filtering period continues for a preset time, it is diagnosed as a brake malfunction.

4. The method for diagnosing various brake pressures of the wheel according to claim 3, characterized in that, The servo valve has a pressure control accuracy of ±1 MPa and a pressure over-limit filtering period of 1 second. If the actual brake pressure persists for a preset time of 0.6 seconds during the pressure over-limit filtering period, it is diagnosed as a brake malfunction.

5. The method for diagnosing various brake pressures of a wheel according to claim 1, characterized in that, The non-braking state includes the period before the braking system is powered on or before landing. The desired pressure is calculated based on the servo valve control current, and the actual braking pressure is collected by the braking control software within a preset pressure deviation filtering period. The difference between the actual braking pressure and the desired pressure is compared with a pressure deviation threshold. If the actual braking pressure continues for a preset time within the pressure deviation filtering period, a braking malfunction is diagnosed.

6. The method for diagnosing various brake pressures of a wheel according to claim 5, characterized in that, The pressure deviation threshold is obtained based on the control accuracy of the servo valve, as well as the fluctuation of the system oil source and the acquisition error. The pressure deviation threshold is ±2 MPa. The pressure deviation filtering period is 1 second. If the actual brake pressure continues for a preset time of 0.8 seconds within the 1 second pressure deviation filtering period, it is diagnosed as a brake failure.

7. The method for diagnosing various brake pressures of a wheel according to claim 1, characterized in that, If, after 3 seconds of no braking command or cancellation of braking command, within 2 seconds of the preset system residual pressure filtering period, the actual braking pressure is collected for more than 1 second and is greater than the system residual pressure threshold of 3 MPa, then a braking fault is diagnosed.

8. A system for diagnosing multiple brake pressures on a wheel, characterized in that, A method for diagnosing multiple brake pressures of a wheel according to any one of claims 1-7, comprising: The analysis unit is configured to analyze the failure modes of the brake channel and the corresponding pressure anomalies to obtain the main factors of tire blowout, including pressure over-limit, pressure deviation and system residual pressure. The pressure over-limit judgment unit is configured to, for the pressure over-limit, preset a maximum braking pressure, periodically detect the actual braking pressure, and if it exceeds the maximum braking pressure, diagnose a brake failure. The pressure deviation judgment unit is configured to preset a pressure deviation threshold for the pressure deviation, detect the actual brake pressure in a non-braking state, and diagnose a brake malfunction if the difference between the actual brake pressure and the expected pressure is greater than the pressure deviation threshold. The system residual pressure judgment unit is configured to preset a system residual pressure threshold for the system residual pressure, and periodically detect the actual braking pressure when there is no braking command. If the actual braking pressure is greater than the system residual pressure threshold, a braking fault is diagnosed.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and, The memory is communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method for diagnosing various brake pressures of the wheel as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method for diagnosing various brake pressures of the wheel as described in any one of claims 1 to 7.

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