Aircraft brake servo valve performance monitoring and health management method

Abstract

The invention relates to the technical field of aircraft brake, in particular to an aircraft brake servo valve performance monitoring and health management method, which comprises the following steps of: acquiring a servo valve theoretical output current and a servo valve recovery current; according to the theoretical output current of each channel of the servo valve and the recovery current of the servo valve, whether brake current output loops of the two channels are abnormal or not is judged; when one channel of brake current output loop is abnormal, whether the other channel of brake current output loop is abnormal or not is judged according to the actual brake pressure and the theoretical pressure; and when the brake pressure output loop of the other channel is normal, brake control is carried out on the servo valve through the channel. By monitoring the performance of the servo valve in real time, it is guaranteed that dynamic switching can be achieved when the performance of the servo valve drifts in the airplane braking process, the influence of the performance drifting of the servo valve on the airplane braking effect is avoided, and the safety of a braking system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft brakes, and in particular to a method for performance monitoring and health management of an aircraft brake servo valve. Background Art

[0002] An aircraft's braking system is a crucial component of the aircraft's electromechanical system, primarily providing braking functions during landing and rollout, shortening the aircraft's rollout distance. Braking systems generally include common functions such as normal landing braking, takeoff line braking, emergency braking, landing gear retraction braking, wheel protection, fault detection, ground contact protection, anti-skid function, and margin switching. The servo valve is an integral component of the braking system. After receiving the braking current signal from the braking system, the servo valve outputs the corresponding braking pressure to the brake device, making it an essential component in achieving the braking function of the braking system. Therefore, monitoring the performance of the servo valve is crucial to managing the health of the braking system.

[0003] Currently, the commonly used servo valve fault detection methods in aircraft brake systems are servo valve open circuit fault detection, servo valve short circuit fault detection, and servo valve drive circuit detection. The logic is as follows: (1) Servo valve open circuit fault: If the servo valve recovery voltage is greater than the open circuit threshold and the servo valve recovery current is less than the open circuit threshold, it is considered that the servo valve has an open circuit fault; (2) Servo valve short circuit fault: The brake system outputs a fixed detection current to the servo valve. If the servo valve recovery voltage is less than the short circuit threshold, it is considered that the servo valve has a short circuit fault; (3) Servo valve drive circuit failure: When neither the servo valve open circuit failure nor the servo valve short circuit failure is detected, the brake system outputs a fixed detection current to the servo valve. If the servo valve recovery current is less than the drive circuit failure threshold, it is considered that the servo valve drive circuit failure has occurred. Summary of the Invention

[0004] The present invention mainly solves the following drawbacks of the currently used fault detection logic: (1) Only extreme faults such as open circuit and short circuit are detected, and the linearity of the servo valve output is not determined: When analyzing the fault mode of the brake current output, only extreme fault conditions such as open circuit and short circuit are currently identified. However, working conditions such as voltage output failure and servo valve drift are not effectively identified from the servo valve performance level.

[0005] (2) Failure to handle single-point faults in the servo valve drive circuit: The servo valve drive circuit is used to output current to the servo valve. If a fault occurs in the servo valve drive circuit, it may output abnormal braking current, and the software cannot cut off the abnormal current, causing the brake system to output abnormal braking pressure, posing 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 abnormal current is detected, the solenoid valve is closed to ensure the safety of the brake system.

[0006] The present invention provides a method for monitoring the performance and health management of an aircraft brake servo valve. The method monitors the servo valve performance in real time to ensure that when the servo valve performance drifts during the aircraft braking process, it can be dynamically switched, thereby avoiding the impact of the servo valve performance drift on the aircraft braking effect and improving the safety of the brake system.

[0007] A first object of the present invention is to provide a method for monitoring the performance and health management of an aircraft brake servo valve, wherein the control servo valve includes two channels, a main channel and a backup channel. The method comprises: Obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal. When the brake pressure output circuit of the other channel is normal, the brake control of the servo valve is performed through the channel.

[0008] Preferably, determining whether the brake current output circuits of the two channels are abnormal includes: When the error between the theoretical output current of each channel of the servo valve and the servo valve recovery current is greater than the threshold and lasts for a period of time, the brake current output circuit of the channel is reported to be abnormal.

[0009] Preferably, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of another channel is abnormal, including: when the deviation between the actual brake pressure and the theoretical pressure of another channel is greater than a threshold and maintained for a period of time, it is determined that the brake pressure output circuit of the other channel is abnormal.

[0010] Preferably, when a channel is judged to be normal through the brake current output circuit and the brake pressure output circuit of the channel is also judged to be normal, the channel is used for brake control.

[0011] Preferably, when judging whether the brake current output circuits of the two channels are abnormal, When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal, and the brake control is performed through the emergency channel.

[0012] Preferably, when determining whether the brake current output circuits of the two channels are abnormal, if both the brake current output circuits of the two channels are abnormal, the brake control is performed through the emergency channel.

[0013] A second object of the present invention is to provide a computer program product, comprising a computer program, which, when executed by a processor, implements a method for monitoring the performance and health management of an aircraft brake servo valve.

[0014] A third object of the present invention is to provide an electronic device comprising: processor; and a memory for storing executable instructions of the processor; The processor is configured to execute the aircraft brake servo valve performance monitoring and health management method by executing the executable instructions.

[0015] A fourth object of the present invention is to provide an aircraft brake servo valve performance monitoring and health management system, comprising: Braking current module, used to obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; The brake pressure module is used to determine whether the brake pressure output circuit of another channel is abnormal based on the actual brake pressure and theoretical pressure when the brake current output circuit of one channel is abnormal; The redundancy switching module is used to control the brake pressure of the servo valve through the channel when the brake pressure output circuit of the other channel is normal.

[0016] The present invention has at least the following beneficial effects: The present invention provides a method for monitoring the performance and health management of an aircraft brake servo valve. The method's primary function in an aircraft brake system is to manage the servo valve's health while effectively preventing single-point failures from causing brake system malfunctions, reducing the impact of the servo valve's performance on the aircraft's braking effect, and leveraging the advantages of the current brake system's electrical dual-redundancy design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the brake current consistency detection provided by the present invention.

[0018] Figure 2 This is another channel brake current consistency detection flow chart provided by the present invention.

[0019] Figure 3 This is a flow chart of the brake pressure consistency detection provided by the present invention. DETAILED DESCRIPTION

[0020] In order to illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description with reference to the embodiments.

[0021] The main function of the present invention in an aircraft braking system is to achieve servo valve health status management while effectively avoiding single point failures that may cause brake system function failure, reduce the impact of servo valve performance on aircraft braking effect, and give full play to the advantages of the current brake system electrical dual redundancy design.

[0022] To achieve the above objectives, a method for monitoring the performance and health management of an aircraft brake servo valve is provided, wherein the control servo valve includes two channels, a main channel and a backup channel. The method comprises: S1. Obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; Determine whether 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 recovery current is greater than the threshold and lasts for a period of time, the brake current output circuit of the channel is reported to be abnormal.

[0023] S2. When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal. Whether the brake pressure output circuit of another channel is abnormal is judged by comparing the actual brake pressure and the theoretical pressure, including: when the deviation between the actual brake pressure and the theoretical pressure of another channel is greater than a threshold and lasts for a period of time, it is judged that the brake pressure output circuit of the other channel is abnormal.

[0024] When judging whether the brake current output circuits of the two channels are abnormal, When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal, and the brake control is performed through the emergency channel.

[0025] When judging whether the brake current output circuits of the two channels are abnormal, if both the brake current output circuits of the two channels are abnormal, the brake control is performed through the emergency channel.

[0026] S3. When the brake pressure output circuit of the other channel is normal, the brake control of the servo valve is performed through the channel.

[0027] When a channel is judged to be normal through the brake current output circuit and the brake pressure output circuit of the channel is also judged to be normal, the channel is used for brake control.

[0028] It should be noted that the servo valve targeted by the present invention includes two channels, a main channel and a backup channel; the two channels simultaneously monitor current consistency, and the current data of the current channel is received by the other channel through inter-board communication.

[0029] In order to illustrate the aircraft brake servo valve performance monitoring and health management method provided by the present invention, an example is provided for illustration.

[0030] First, the brake current consistency test See also Figure 1 As shown in the figure, during the software cycle operation, the consistency between the servo valve theoretical output current and the servo valve recovery current is judged in real time. When the servo valve theoretical output current or the servo valve recovery current is greater than the threshold and the anti-skid function is not working, (1) during the shutdown braking period: if the servo valve recovery current is less than the threshold, (2) during the non-shutdown braking period: if the error between the servo valve theoretical output current and the servo valve recovery current is greater than the threshold for a period of time, the "brake current output circuit abnormality" is reported and the fault is locked.

[0031] By setting the precondition that the theoretical output current of the servo valve or the servo valve recovery current is greater than the threshold, comprehensive consideration can be given to working conditions such as output with no current, and no output with current.

[0032] See also Figure 2 As shown, "theoretical output current of servo valve" and "anti-slip working status" are added through inter-board communication. In the channel that controls the output, when the inter-board communication is normal, the theoretical output current of the servo valve of another channel and the servo valve recovery current are received through inter-board communication to judge the consistency of the current output. If the error between the theoretical output current of the servo valve of another channel and the servo valve recovery current of another channel is greater than the threshold for a period of time, it will be reported that "the brake current output circuit of the other channel is abnormal" and the fault is locked.

[0033] Secondly, brake pressure consistency test See also Figure 3As shown, since the servo valve back-collection current of the other channel may have abnormal data but actually has no significant impact on the brake pressure, a pressure signal judgment is added on the basis of the "another channel brake current output circuit abnormality" logic. When the conditions for reporting "brake current output circuit abnormality" are met and the oil source and pressure sensor are normal, when the landing gear brake is retracted, if the deviation between the actual brake pressure and the command theoretical pressure is greater than the threshold and maintained for a period of time, the "another channel brake pressure output circuit abnormality" is reported; when braking normally and the command sensor and command acquisition circuit are normal, if the deviation between the actual brake pressure and the command theoretical pressure is greater than the threshold and maintained for a period of time, the "another channel brake pressure output circuit abnormality" is reported.

[0034] Finally, redundancy switching optimization When the aircraft has "brake current output circuit abnormality" or "another channel brake pressure output circuit abnormality", the solenoid valves of both the main and standby channels are closed, and the brake alarm is eventually reported. You can try to clear the fault by cycling power and retracting the landing gear. If the fault cannot be cleared or in an emergency, use the emergency brake for braking.

[0035] When the machine has "brake current output circuit abnormality", it reports a shutdown brake failure and performs redundancy switching during the shutdown brake period, with the control output channel controlled by the other channel brake.

[0036] The present invention provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, a method for monitoring the performance and health management of an aircraft brake servo valve is implemented.

[0037] The present invention provides an electronic device, comprising: processor; and a memory for storing executable instructions of the processor; The processor is configured to execute the aircraft brake servo valve performance monitoring and health management method by executing the executable instructions.

[0038] The present invention provides an aircraft brake servo valve performance monitoring and health management system, comprising: Braking current module, used to obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; The brake pressure module is used to determine whether the brake pressure output circuit of another channel is abnormal based on the actual brake pressure and theoretical pressure when the brake current output circuit of one channel is abnormal; The redundancy switching module is used to control the brake pressure of the servo valve through the channel when the brake pressure output circuit of the other channel is normal.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for monitoring the performance and health management of an aircraft brake servo valve, characterized in that: Used for monitoring a servo valve, wherein the control servo valve includes two channels, a main channel and a backup channel; the method comprises: Obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal. When the brake pressure output circuit of the other channel is normal, the brake control of the servo valve is performed through the channel.

2. The aircraft brake servo valve performance monitoring and health management method according to claim 1, characterized in that: Determine whether 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 recovery current is greater than the threshold and lasts for a period of time, the brake current output circuit of the channel is reported to be abnormal.

3. The aircraft brake servo valve performance monitoring and health management method according to claim 1, characterized in that: The actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of another channel is abnormal, including: when the deviation between the actual brake pressure and the theoretical pressure of another channel is greater than a threshold and lasts for a period of time, it is determined that the brake pressure output circuit of the other channel is abnormal.

4. The aircraft brake servo valve performance monitoring and health management method according to claim 1, characterized in that: When a channel is judged to be normal through the brake current output circuit and the brake pressure output circuit of the channel is also judged to be normal, the channel is used for brake control.

5. The aircraft brake servo valve performance monitoring and health management method according to claim 1, characterized in that: When judging whether the brake current output circuits of the two channels are abnormal, When the brake current output circuit of one channel is abnormal, the actual brake pressure and theoretical pressure are used to determine whether the brake pressure output circuit of the other channel is abnormal, and the brake control is performed through the emergency channel.

6. The aircraft brake servo valve performance monitoring and health management method according to claim 1, characterized in that: When judging whether the brake current output circuits of the two channels are abnormal, if both the brake current output circuits of the two channels are abnormal, the brake control is performed through the emergency channel.

7. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the aircraft brake servo valve performance monitoring and health management method according to any one of claims 1 to 6 is implemented.

8. An electronic device, characterized in that: include: processor; as well as a memory for storing 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 6 by executing the executable instructions.

9. An aircraft brake servo valve performance monitoring and health management system, characterized in that: include: Braking current module, used to obtain the theoretical output current of the servo valve and the servo valve recovery current; According to the theoretical output current of each channel of the servo valve and the servo valve recovery current, determine whether the brake current output circuits of the two channels are abnormal; The brake pressure module is used to determine whether the brake pressure output circuit of another channel is abnormal based on the actual brake pressure and theoretical pressure when the brake current output circuit of one channel is abnormal; The redundancy switching module is used to control the brake pressure of the servo valve through the channel when the brake pressure output circuit of the other channel is normal.

Images