An aircraft brake servo valve performance monitoring and health management method

Abstract

The present application relates to the technical field of aircraft brake, in particular to a kind of aircraft brake servo valve performance monitoring and health management method, the method includes obtaining servo valve theoretical output current and servo valve back extraction current;According to the theoretical output current of each channel of servo valve and servo valve back extraction current, whether the brake current output loop of two channels is abnormal is judged;When one channel brake current output loop is abnormal, whether the brake pressure output loop of another channel is abnormal is judged by actual brake pressure and theoretical pressure;When the brake pressure output loop of the other channel is normal, the servo valve is controlled by the channel for braking. The present application monitors the performance of servo valve in real time, ensures that when the performance of servo valve drifts during the process of aircraft brake, it can be dynamically switched, avoids the influence of servo valve performance drift on the effect of aircraft brake, and improves the safety of brake system.

Description

Technical Field

[0001] This invention relates to the field of aircraft braking technology, specifically to a method for monitoring the performance and health management of an aircraft brake servo valve. Background Technology

[0002] The aircraft braking system is a crucial component of the aircraft's electromechanical system, primarily responsible for braking during landing and takeoff phases to shorten the aircraft's runway distance. Braking systems generally possess common functions such as normal landing braking, takeoff line braking, emergency braking, landing gear retraction braking, wheel-to-wheel protection, fault detection, grounding protection, anti-skid functionality, and redundancy switching. The servo valve is an indispensable part of the braking system. After receiving the braking current signal from the braking system, the servo valve outputs the corresponding braking pressure to the braking device, making it essential for the braking function of the system. Therefore, monitoring the performance of the servo valve is a vital aspect of braking system health management.

[0003] Currently, the commonly used methods for servo valve fault detection in aircraft braking systems are servo valve open circuit fault detection, servo valve short circuit fault detection, and servo valve drive circuit detection, with the following logic:

[0004] (1) Servo valve open circuit fault: If the servo valve sampling voltage is greater than the open circuit threshold and the servo valve sampling current is less than the open circuit threshold, the servo valve is considered to have an open circuit fault.

[0005] (2) Servo valve short circuit fault: The braking system outputs a fixed detection current to the servo valve. If the servo valve sampling voltage is less than the short circuit threshold, the servo valve is considered to have a short circuit fault.

[0006] (3) Servo valve drive circuit failure: When neither the open circuit failure nor the short circuit failure of the servo valve is detected, the braking system outputs a fixed detection current to the servo valve. If the current sampled by the servo valve is less than the fault threshold of the drive circuit, the servo valve is considered to have a drive circuit failure. Summary of the Invention

[0007] This invention primarily addresses the following drawbacks of currently used fault detection logic:

[0008] (1) Only open circuit and short circuit extreme faults are detected, and the linearity of the servo valve output is not judged: Analyzing the fault modes of the brake current output, currently only open circuit and short circuit extreme faults are identified, but voltage output failure, servo valve drift and other conditions are not effectively identified from the servo valve performance level.

[0009] (2) Lack of single-point fault handling in the servo valve drive circuit: The servo valve drive circuit is used to output current to the servo valve. If the servo valve drive circuit fails, it may output abnormal braking current, and the software cannot cut off the abnormal current, causing the braking system to output abnormal braking pressure, which poses a risk of tire blowout. There is room for improvement and optimization. This can be achieved by detecting the current consistency of another channel in the control output channel. If an abnormal current is detected, the solenoid valve is shut down to ensure the safety of the braking system.

[0010] This invention provides a method for monitoring and managing the performance and health of an aircraft brake servo valve. By monitoring the servo valve performance in real time, this method ensures that when the servo valve performance drifts during aircraft braking, it can be dynamically switched, thus avoiding the impact of servo valve performance drift on the aircraft braking effect and improving the safety of the braking system.

[0011] The first objective of this invention is to provide a method for monitoring the performance and health management of an aircraft brake servo valve, used for monitoring the servo valve, wherein the control servo valve includes two channels: a main channel and a backup channel; the method includes:

[0012] Obtain the theoretical output current and the servo valve feedback current of the servo valve;

[0013] Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal.

[0014] If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is judged to be abnormal by comparing the actual brake pressure with the theoretical pressure.

[0015] When the brake pressure output circuit of the other channel is normal, the brake is controlled through the servo valve via this channel.

[0016] Preferably, determining whether the two channel braking current output circuits are abnormal includes:

[0017] When the error between the theoretical output current of each channel of the servo valve and the servo valve sampling current exceeds the threshold for a period of time, an abnormality is reported in the brake current output circuit of that channel.

[0018] Preferably, determining whether the brake pressure output circuit of another channel is abnormal by comparing the actual brake pressure with the theoretical pressure includes: if the deviation between the actual brake pressure and the theoretical pressure of the other channel is greater than a threshold and remains for a period of time, then the brake pressure output circuit of the other channel is determined to be abnormal.

[0019] Preferably, when a channel is judged to be normal by the brake current output circuit and then judged to be normal by the brake pressure output circuit of the same channel, then the channel is used for brake control.

[0020] Preferably, when determining whether the brake current output circuits of the two channels are abnormal,

[0021] If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is determined to be abnormal by comparing the actual brake pressure with the theoretical pressure. In this case, brake control is performed through the emergency channel.

[0022] Preferably, when determining whether the two channel brake current output circuits are abnormal, if both channel brake current output circuits are abnormal, then brake control is performed through the emergency channel.

[0023] The second objective of this invention is to provide a computer program product, including a computer program that, when executed by a processor, implements a method for monitoring the performance and health management of an aircraft brake servo valve.

[0024] A third objective of this invention is to provide an electronic device comprising:

[0025] Processor; and

[0026] Memory for storing the executable instructions of the processor;

[0027] The processor is configured to execute an aircraft brake servo valve performance monitoring and health management method by executing the executable instructions.

[0028] The fourth objective of this invention is to provide an aircraft brake servo valve performance monitoring and health management system, comprising:

[0029] The brake current module is used to obtain the theoretical output current of the servo valve and the servo valve feedback current.

[0030] Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal.

[0031] The brake pressure module is used to determine whether the brake pressure output circuit of the other channel is abnormal when one of the brake current output circuits is abnormal, by comparing the actual brake pressure with the theoretical pressure.

[0032] The redundancy switching module is used to control the servo valve through the other channel when the brake pressure output circuit of the other channel is normal.

[0033] The present invention has at least the following beneficial effects:

[0034] This invention provides a method for monitoring the performance and health management of aircraft brake servo valves. The main function of this method in aircraft braking systems is to effectively prevent single-point failures from causing brake system malfunctions while managing the health status of servo valves, reducing the impact of servo valve performance on aircraft braking effects, and leveraging the advantages of current electrical dual-redundancy design in braking systems. Attached Figure Description

[0035] Figure 1 The flowchart for brake current consistency detection provided by the present invention.

[0036] Figure 2 This invention provides a flowchart for another channel brake current consistency detection.

[0037] Figure 3 A flowchart for brake pressure consistency detection provided by the present invention. Detailed Implementation

[0038] In order to illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description is provided in conjunction with the embodiments.

[0039] The purpose of this invention is to enable the servo valve to manage its health status while effectively preventing single-point failures that could lead to brake system malfunctions, reducing the impact of servo valve performance on aircraft braking effectiveness, and leveraging the advantages of current dual-redundancy electrical design in braking systems.

[0040] To achieve the above objectives, a method for monitoring the performance and health management of an aircraft brake servo valve is provided. This method monitors the servo valve, which includes two channels: a main channel and a backup channel. The method comprises:

[0041] S1. Obtain the theoretical output current of the servo valve and the servo valve sampling current.

[0042] Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal.

[0043] Determine if the brake current output circuits of the two channels are abnormal, including:

[0044] When the error between the theoretical output current of each channel of the servo valve and the servo valve sampling current exceeds the threshold for a period of time, an abnormality is reported in the brake current output circuit of that channel.

[0045] S2. If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is judged to be abnormal by comparing the actual brake pressure with the theoretical pressure.

[0046] Determine whether the brake pressure output circuit of another channel is abnormal by comparing the actual brake pressure with the theoretical pressure. This includes determining whether the brake pressure output circuit of the other channel is abnormal if the deviation between the actual brake pressure and the theoretical pressure of the other channel is greater than a threshold and remains so for a period of time.

[0047] When determining whether the brake current output circuits of the two channels are abnormal.

[0048] If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is determined to be abnormal by comparing the actual brake pressure with the theoretical pressure. In this case, brake control is performed through the emergency channel.

[0049] When determining whether the brake current output circuits of the two channels are abnormal, if both brake current output circuits are abnormal, brake control is performed through the emergency channel.

[0050] S3. When the brake pressure output circuit of the other channel is normal, brake control is performed on its servo valve through this channel.

[0051] If the brake current output circuit of a channel is normal, and the brake pressure output circuit of the same channel is also normal, then that channel is used for brake control.

[0052] It should be noted that the servo valve targeted by this invention includes two channels: a main channel and a backup channel. Both channels monitor current consistency simultaneously, and this channel receives current data from the other channel through inter-board communication.

[0053] To illustrate the method for monitoring the performance and health management of an aircraft brake servo valve provided by this invention, examples are provided.

[0054] First, brake current consistency detection

[0055] See Figure 1 As shown, during the software cycle operation, the consistency between the theoretical output current of the servo valve and the servo valve feedback current is judged in real time. When the theoretical output current of the servo valve or the servo valve feedback current is greater than the threshold and the anti-slip is not working, (1) During the shutdown braking period: if the servo valve feedback current is less than the threshold, (2) During the non-shutdown braking period: if the error between the theoretical output current of the servo valve and the servo valve feedback current is greater than the threshold for a period of time, "brake current output circuit abnormal" is reported, and the fault is locked.

[0056] By setting a precondition that the theoretical output current of the servo valve or the servo valve feedback current is greater than a threshold, we can comprehensively consider operating conditions such as having output but no current and having no output but current.

[0057] See Figure 2As shown, "theoretical output current of servo valve" and "anti-slip working status" are added through inter-board communication. In the control output channel, when the inter-board communication is normal, the theoretical output current of the servo valve in another channel is received through inter-board communication and the servo valve feedback current is used to judge the consistency of the current output. If the error between the theoretical output current of the servo valve in another channel and the feedback current of the servo valve in another channel is greater than the threshold for a period of time, "abnormal brake current output circuit in another channel" is reported, and the fault is locked.

[0058] Secondly, brake pressure consistency test

[0059] See Figure 3 As shown, since there may be abnormal data in the current sampled by the other servo valve, but it does not actually have a significant impact on the brake pressure, a pressure signal judgment is added to the logic of "abnormal brake current output circuit of the other channel". When the conditions for reporting "abnormal brake current output circuit" are met and the oil source and pressure sensor are normal, if the actual brake pressure deviates from the theoretical command pressure for a period of time when the landing gear is retracted and braking, the "abnormal brake pressure output circuit of the other channel" will be reported. Under normal braking conditions and with the command sensor and command acquisition circuit normal, if the actual brake pressure deviates from the theoretical command pressure for a period of time, the "abnormal brake pressure output circuit of the other channel" will be reported.

[0060] Finally, redundancy switching optimization

[0061] When the machine encounters "abnormal brake current output circuit" or "abnormal brake pressure output circuit of another channel", both the main and backup channels will shut down the solenoid valves, eventually reporting a brake alarm. The fault can be cleared by restarting the power supply and retracting the landing gear. If the fault cannot be cleared or in an emergency, the emergency brake can be used for braking.

[0062] When the machine experiences an "abnormal brake current output circuit", it reports a stop brake fault and performs redundancy switching during the stop brake period, with the control output channel being controlled by another brake channel.

[0063] This invention provides a computer program product, including a computer program that, when executed by a processor, implements a method for monitoring the performance and health management of an aircraft brake servo valve.

[0064] This invention provides an electronic device, comprising:

[0065] Processor; and

[0066] Memory for storing the executable instructions of the processor;

[0067] The processor is configured to execute an aircraft brake servo valve performance monitoring and health management method by executing the executable instructions.

[0068] This invention provides a performance monitoring and health management system for aircraft brake servo valves, comprising:

[0069] The brake current module is used to obtain the theoretical output current of the servo valve and the servo valve feedback current.

[0070] Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal.

[0071] The brake pressure module is used to determine whether the brake pressure output circuit of the other channel is abnormal when one of the brake current output circuits is abnormal, by comparing the actual brake pressure with the theoretical pressure.

[0072] The redundancy switching module is used to control the servo valve through the other channel when the brake pressure output circuit of the other channel is normal.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for performance monitoring and health management of an aircraft brake servo valve, characterized in that, This method is used for monitoring servo valves, wherein the servo valve control includes two channels: main and backup. Obtain the theoretical output current and the servo valve feedback current of the servo valve; Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal. If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is judged to be abnormal by comparing the actual brake pressure with the theoretical pressure. When the brake pressure output circuit of the other channel is normal, the brake is controlled through the servo valve via this channel; If the brake current output circuit of a channel is normal, and the brake pressure output circuit of the same channel is also normal, then the channel is used for brake control. When determining whether the brake current output circuits of the two channels are abnormal. If one of the brake current output circuits is abnormal, the brake pressure output circuit of the other channel is determined to be abnormal by comparing the actual brake pressure with the theoretical pressure. In this case, brake control is performed through the emergency channel. When determining whether the brake current output circuits of the two channels are abnormal, if both brake current output circuits are abnormal, brake control is performed through the emergency channel.

2. The method for monitoring and managing the performance and health of an aircraft brake servo valve according to claim 1, characterized in that, Determine if the brake current output circuits of the two channels are abnormal, including: When the error between the theoretical output current of each channel of the servo valve and the servo valve sampling current exceeds the threshold for a period of time, an abnormality is reported in the brake current output circuit of that channel.

3. The method for monitoring and managing the performance and health of an aircraft brake servo valve according to claim 1, characterized in that, Determine whether the brake pressure output circuit of another channel is abnormal by comparing the actual brake pressure with the theoretical pressure. This includes determining whether the brake pressure output circuit of the other channel is abnormal if the deviation between the actual brake pressure and the theoretical pressure of the other channel is greater than a threshold and remains so for a period of time.

4. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the aircraft brake servo valve performance monitoring and health management method as described in any one of claims 1 to 3.

5. An electronic device, characterized in that, include: processor; as well as Memory for storing the executable instructions of the processor; The processor is configured to execute the aircraft brake servo valve performance monitoring and health management method according to any one of claims 1 to 3 by executing the executable instructions.

6. A system for monitoring the performance and health management of an aircraft brake servo valve as described in claim 1, characterized in that, include: The brake current module is used to obtain the theoretical output current of the servo valve and the servo valve feedback current. Based on the theoretical output current of each channel of the servo valve and the servo valve feedback current, determine whether the brake current output circuit of the two channels is abnormal. The brake pressure module is used to determine whether the brake pressure output circuit of the other channel is abnormal when one of the brake current output circuits is abnormal, by comparing the actual brake pressure with the theoretical pressure. The redundancy switching module is used to control the servo valve through the other channel when the brake pressure output circuit of the other channel is normal.

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