Hydraulic oil leakage monitoring method and system for A320 hydraulic system

Abstract

The invention relates to a hydraulic oil leakage monitoring method and system for an A320 hydraulic system. The method comprises the steps that after oil mass parameter data and auxiliary parameter data of an A320 hydraulic system are obtained, a normal state message is obtained and sent through a preset hydraulic oil leakage normal state message triggering model, meanwhile, whether the current oil mass parameter data exceed a current preset threshold value or not is judged through a preset hydraulic oil leakage alarm message triggering model, and if yes, the normal state message is sent to the A320 hydraulic system; if yes, generating and sending a hydraulic oil leakage alarm message based on the current oil quantity parameter data and the auxiliary parameter data, otherwise, returning to obtain the parameter data, and correcting the preset threshold by the current auxiliary parameter data; receiving and analyzing the current normal message and the hydraulic oil leakage alarm message, and correcting and filtering the current hydraulic oil leakage alarm message by using the normal message to obtain an effective message; and displaying and sending the effective message. Compared with the prior art, the method has the advantages that the real-time performance and the accuracy of leakage detection of the A320 hydraulic system are improved, and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of Airbus aircraft, and in particular to a method and system for monitoring hydraulic oil leakage in an A320 hydraulic system. Background Art

[0002] In modern civil aircraft control technology, the hydraulic system used to realize the actuation of aircraft control surfaces is one of the important systems. The working principle of the hydraulic system can be simply summarized as follows: the liquid pressure is converted into mechanical energy through the hydraulic pump, and then the liquid is transmitted to the required position through the hydraulic pipeline, and finally the liquid energy is converted into mechanical energy through the hydraulic actuator to operate the aircraft in the air to complete various necessary flight trajectories. The A320 hydraulic system is divided into three independent systems: green, yellow and blue. The failure of any system among them will not affect the operation of other systems. The green and yellow systems are connected by a liquid-isolated PTU transmission device, which can perform power conversion between them.

[0003] The hydraulic system has a simple structure, low cost, high reliability, and no operational delay. It is widely used in modern large and medium-sized transport aircraft. The three hydraulic systems used by the A320 all have a pressure of 3000psi. High hydraulic pressure can bring flexible and convenient operating force, but it also has a very fatal defect, namely hydraulic oil leakage. Once the pipeline leaks, when the oil volume in the tank is not enough to maintain the normal hydraulic pressure of 3000psi, the pressure will drop sharply to 0, and the hydraulic system will lose its function. The aircraft control surfaces operated by the system will also stop moving, which is very dangerous for flight safety. Generally, after a hydraulic system is lost in the air, some key aircraft operating systems will also work at half speed, such as the flap and slat system of the A320. There will also be time delays in the retraction and extension of the landing gear. The aircraft needs to land immediately. If two hydraulic systems are lost in the air at the same time, the aircraft will become very difficult to operate. If three hydraulic systems are lost in the air at the same time, the aircraft will become uncontrollable, and a flight accident with aircraft destruction and death may occur.

[0004] At present, there is no reliable and mature technology for preventing hydraulic oil leakage. Domestic airlines rely on the warning standards set by aircraft manufacturers. This warning will only be issued when a large amount of hydraulic oil leaks in the air, causing low oil level or low pressure in the tank. Often at this time, the relevant hydraulic system has lost its function and the aircraft needs to return to the airport for emergency landing and troubleshooting. Another method is relatively primitive, which is to conduct regular visual inspections of various hydraulic areas and components of the aircraft during regular inspections according to the CMP maintenance plan. On the one hand, this method has a long inspection cycle and is prone to omissions. On the other hand, large-area visual inspections are cursory and cannot achieve the desired preventive effect. Therefore, how to improve the real-time and accuracy of A320 hydraulic system leakage monitoring has become a problem that needs to be solved in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a hydraulic oil leakage monitoring method and system for an A320 hydraulic system, which can effectively improve the real-time and accuracy of leakage monitoring of the A320 hydraulic system.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to a first aspect of the present invention, a method for monitoring hydraulic oil leakage of an A320 hydraulic system is provided, comprising the following steps: S1, obtaining oil quantity parameter data and auxiliary parameter data of the A320 hydraulic system; S2, based on the oil quantity parameter data, obtaining and sending a normal message using a preset hydraulic oil leakage normal message trigger model, and at the same time, using a preset hydraulic oil leakage alarm message trigger model to determine whether the current oil quantity parameter data exceeds the current preset threshold value, if yes, executing S3, otherwise returning to S1, wherein the preset threshold value is corrected by the current auxiliary parameter data; S3, generating and sending a hydraulic oil leakage alarm message based on the current oil quantity parameter data and the auxiliary parameter data; S4, receiving and parsing the current normal message and the hydraulic oil leakage alarm message, and using the normal message to correct and filter the current hydraulic oil leakage alarm message to obtain a valid message; S5, displaying and sending the valid message.

[0008] As a preferred technical solution, the fuel quantity parameter data includes a first fuel quantity difference and a second fuel quantity difference. The first fuel quantity difference is the difference of the same fuel quantity parameter within a preset first time interval during the flight operation, and the second fuel quantity difference is the difference of the same fuel quantity parameter between the flight starting point and the flight end point.

[0009] As a preferred technical solution, S3 specifically includes: obtaining landing gear handle position data; when the landing gear handle position data meets the preset position condition and the first oil quantity difference exceeds the current first preset threshold, determining the generation time of the hydraulic oil leakage alarm message, and generating the hydraulic oil leakage alarm message from the generation time.

[0010] As a preferred technical solution, the S3 specifically includes: obtaining the current A320 hydraulic system pressure; when the A320 hydraulic system pressure is less than or equal to 100 and the second oil volume difference exceeds the current second preset threshold, generating a hydraulic oil leakage alarm message.

[0011] As a preferred technical solution, when the A320 hydraulic system is a green system or a yellow system, the auxiliary parameter data includes landing gear handle position data, aircraft braking data and turning data.

[0012] As a preferred technical solution, the normal message is captured by the hydraulic oil leakage normal message triggering model at the best time point of each flight segment, and the best time point is the working time of the A320 hydraulic system.

[0013] As a preferred technical solution, the normal message is generated and sent after each flight segment ends.

[0014] As a preferred technical solution, the hydraulic oil leakage normal message trigger model and the hydraulic oil leakage alarm message trigger model are established through big data collection and analysis.

[0015] According to a second aspect of the present invention, a hydraulic oil leakage monitoring system for an A320 hydraulic system is provided, the system being used to implement the method described, comprising a data acquisition and processing module and a message parsing and displaying module which are communicatively connected; the data acquisition and processing module being used to obtain oil quantity parameter data and auxiliary parameter data of the A320 hydraulic system; based on the oil quantity parameter data, a preset hydraulic oil leakage normal message triggering model is used to obtain and send a normal message, and at the same time, a preset hydraulic oil leakage alarm message triggering model is used to determine whether the current oil quantity parameter data exceeds the current preset threshold value, if so, a hydraulic oil leakage alarm message is generated and sent based on the current oil quantity parameter data and auxiliary parameter data, otherwise the parameter data is re-acquired, wherein the preset threshold value is corrected by the current auxiliary parameter data; the message parsing and displaying module is used to receive and parse the current normal message and hydraulic oil leakage alarm message, and the current hydraulic oil leakage alarm message is corrected and filtered using the normal message, and after obtaining a valid message, the valid message is displayed and sent.

[0016] As a preferred technical solution, the data acquisition and processing module includes ground loading equipment and an onboard computer flight data interface component, and the message parsing and display module includes an aircraft communication addressing and reporting system and a ground control terminal.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The hydraulic oil leakage monitoring method for the A320 hydraulic system proposed by the present invention not only considers key parameters such as oil volume parameter data, but also considers auxiliary parameter data, and uses a preset hydraulic oil leakage normal message trigger model to obtain and send normal messages, so as to realize real-time monitoring of key parameters of the A320 hydraulic system. At the same time, the hydraulic oil leakage alarm message trigger model is used to determine whether the current oil volume parameter data exceeds the current preset threshold value, and the preset oil volume threshold value is corrected by using real-time auxiliary parameter data, so as to improve the rationality of the preset oil volume threshold value. In addition, the normal message is also used to correct and filter the hydraulic oil leakage alarm message, which is more conducive to ensuring that the crew is reminded in real time and sent to the ground control center before the oil volume leaks but has not reached the low oil level warning, that is, the A320 hydraulic system pipeline leakage can be predicted in advance, and corrective measures can be taken before the aircraft loses the corresponding hydraulic system, so as to realize the real-time and accurate monitoring of the hydraulic oil leakage of the A320 aircraft, and provide a basis for the crew to take measures in time and for the technical support of engineers;

[0019] 2. The present invention provides two trigger conditions when generating and sending hydraulic oil leakage alarm messages based on the current oil quantity parameter data and auxiliary parameter data. One is to generate a hydraulic oil leakage alarm message based on the first oil quantity difference and the landing gear handle position data, and the other is to generate a hydraulic oil leakage alarm message based on the second oil quantity difference and the A320 hydraulic system pressure condition, which can further improve the accuracy of monitoring the hydraulic oil leakage of the A320 aircraft and reduce omissions;

[0020] 3. The present invention can select different auxiliary parameter data to participate in modeling and assist in generating hydraulic oil leakage alarm messages for different A320 hydraulic systems, which can reduce the influence of auxiliary parameter data on leakage prediction during actual prediction, reduce errors, and improve the accuracy of monitoring the hydraulic oil leakage of A320 aircraft, making it convenient for engineers to take maintenance measures in time to ensure flight safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the system architecture and communication transmission relationship in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the method flow in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0024] Example

[0025] This embodiment provides a hydraulic oil leakage monitoring system and method for an A320 hydraulic system. The system includes a data acquisition and processing module and a message parsing and display module that are communicatively connected. The data acquisition and processing module includes a ground loading device (GLS) and an onboard computer flight data interface unit (i.e., an onboard computer FDIMU). The message parsing and display module includes an aircraft communications addressing and reporting system (Aircraft Communications Addressing and Reporting System, ACARS) and a ground control terminal (GCD). The data acquisition and processing module is used to implement steps S1 to S3, and the message parsing and display module is used to implement steps S4 to S5. In actual application, the communication transmission relationship between each hardware is as follows: Figure 1 As shown. Figure 2 As shown, based on this system, the execution steps of the method provided in this embodiment are as follows:

[0026] Step S1, the onboard computer FDIMU obtains the oil quantity parameter data and auxiliary parameter data of the A320 hydraulic system.

[0027] The oil quantity parameter data is the key parameter data for predicting the leakage of hydraulic oil in the A320 hydraulic system, including the first oil quantity difference and the second oil quantity difference. For the key parameters of the A320 hydraulic system oil quantity QG, ​​QY, QB: the first oil quantity difference is the difference Δm of the same oil quantity parameter in the follow-up time range (i.e. the preset first time interval, for example, 10 minutes) preset by the ground control end during the flight operation (since the A320 hydraulic oil displays the value every 4 seconds, after completing the difference Δm1 between the 1st second and the 600th second, the difference Δm2 between the 4th second and the 604th second is executed, and so on...), and the second oil quantity difference is: the difference Δn of the same oil quantity parameter between the flight start point and the flight end point.

[0028] The auxiliary parameter data is determined according to different A320 hydraulic systems: when the A320 hydraulic system is a green system, the auxiliary parameter data can select landing gear handle position data, flaps and slats data or rudder data; when the A320 hydraulic system is a yellow system, the auxiliary parameter data can select aircraft braking data, turning data, flaps and slats data or rudder data.

[0029] The difference in auxiliary parameter data under different hydraulic systems is determined by the working principle of the A320 hydraulic system. The A320 hydraulic system uses three independent systems, namely the green, yellow and blue hydraulic systems. The green and yellow systems are driven by the left and right engine hydraulic pumps respectively. In normal configuration, they are independent of each other, and a failure on one side will not affect the other system. The green and yellow hydraulic systems are connected by PTU. The function of PTU is to allow the two systems to use the kinetic energy of the hydraulic oil on one side to drive the other hydraulic system to work when the hydraulic oil is independent. The blue system is driven by an electric pump. According to the working principle of hydraulic oil, the main loads of the green system are landing gear, flaps and rudders, the main loads of the yellow system are brakes, turns, flaps and rudders, and the main loads of the blue system are flaps and rudders. When these loads are working, the amount of hydraulic oil will change. Therefore, for the green and yellow systems with large changes in fuel volume, it is necessary to consider the influence of landing gear retraction and extension, braking and front wheel turning. The influence can be filtered out by using other auxiliary parameters to perform modeling within the following time range. For example, the above-mentioned influencing factors can be filtered out by judging the landing gear handle position data. When on the ground, the turning data and braking data can be referred to. The influence of flaps and slats and rudders in the air on fuel volume fluctuations can be filtered out by using the first fuel volume difference obtained within the following time range. For the blue system with small changes in fuel volume, direct modeling is sufficient.

[0030] Step S2, the onboard computer FDIMU obtains and sends normal messages based on the oil quantity parameter data using the preset hydraulic oil leakage normal message trigger model. At the same time, it uses the preset hydraulic oil leakage alarm message trigger model to determine whether the current oil quantity parameter data exceeds the current preset threshold. If so, execute step S3, otherwise return to step S1, wherein the preset threshold is corrected by the current auxiliary parameter data.

[0031] In other words, after receiving the oil quantity parameter data and the required auxiliary parameter data, the onboard computer FDIMU generates a normal message and determines whether the oil quantity parameter data exceeds the current preset threshold. Among them, the normal message is generated after the end of each flight segment and sent to the ground control terminal (GCD) through ACARS. The hydraulic oil leakage normal message trigger model captures the best time point in each flight segment, and the best time point is the working time of the A320 hydraulic system. At the same time, the onboard computer FDIMU compares the received oil quantity parameter data with the pre-installed message logic in the hydraulic oil leakage alarm message trigger model to determine whether the current oil quantity parameter data exceeds the current preset threshold. In addition, the hydraulic oil leakage normal message trigger model and the hydraulic oil leakage alarm message trigger model are established based on big data collection and analysis, and normal messages for supplementation and hydraulic oil leakage alarm messages for early warning are written; before executing step S2, the written hydraulic oil leakage alarm message and normal message have been installed in the onboard computer FDIMU using the ground loading equipment (GLS), that is, the hydraulic oil leakage normal message trigger model and the hydraulic oil leakage alarm message trigger model are installed on the aircraft and the required parameters are collected according to the instructions.

[0032] In this embodiment, for the green system or the yellow system, the first preset threshold is 0.5L, and the second preset threshold is 1.8L. The onboard computer FDIMU calculates the first fuel volume difference Δm within 10 minutes and the second fuel volume difference Δn between the flight start point and the flight end point. When Δm is greater than or equal to 0.5L or Δn is greater than or equal to 1.8L, step S3 is executed, otherwise, the system returns to the beginning and execution of step S1 is restarted. If the hydraulic system is a blue system, the second preset threshold is 1.3L.

[0033] Step S3, generating and sending a hydraulic oil leakage alarm message based on the current oil volume parameter data and the auxiliary parameter data.

[0034] According to the comparison result obtained in step S2, the execution of step S3 includes two cases:

[0035] (1) When Δm is greater than or equal to 0.5L, the onboard computer FDIMU calculates the landing gear handle position and determines whether the landing gear handle is in the up position based on the calculation result. If so, it delays 60 seconds before starting to generate the hydraulic oil leakage alarm message to eliminate the interference of the landing gear, turning, and braking on the oil volume of the green / yellow system. Otherwise, it returns to and restarts step S1.

[0036] (2) When Δn is greater than or equal to 1.8 L, the aircraft is on the ground, the current A320 hydraulic system pressure is obtained and it is determined whether it is less than or equal to 100 psi. If so, a hydraulic oil leakage alarm message is generated, otherwise the process returns to and restarts step S1.

[0037] If any of the above conditions are met, the corresponding hydraulic oil leakage alarm message will be generated, and the generated hydraulic oil leakage alarm message will be sent to the ground control terminal (GCD) through ACARS. The data transmission method based on the ACARS system can use VHF communication transmission (generally suitable for short-distance flights) or satellite communication transmission (generally suitable for transoceanic or intercontinental flights). Both data transmissions are bidirectional transmission data links.

[0038] Step S4, the ground control terminal (GCD) receives and analyzes the current normal message and the hydraulic oil leakage alarm message, and uses the normal message to correct and filter the current hydraulic oil leakage alarm message to obtain a valid message.

[0039] Among them, the ground control terminal (GCD) needs to determine whether the correction has been completed. If not, it will continue to correct. If it has been completed, it will continue to execute the subsequent steps. The ground control terminal (GCD) includes a ground software platform. The software platform is a visual processing and display system that is used to parse the original message data, filter false messages according to the preset logic, so that the final message accuracy rate reaches more than 85%, and visualize the key parameters of the final message to form curves, points and other trend graphics for engineers to monitor.

[0040] Step S5, display and send valid messages. Specifically, the display terminal receives valid messages sent by the ground control terminal and automatically outputs them to the client. The client is a user's mobile phone, corporate WeChat, email, etc., and the display terminal can be part of the ground software platform.

[0041] In summary, the monitoring system and method provided in this embodiment use the hydraulic oil volume of the A320 aircraft within a certain period of time as a reference point, and compare the corresponding difference between the oil volume a few seconds before the start of the flight and the last few seconds after the end of the flight to eliminate the interference of large system users (such as retracting and extending the landing gear, retracting and extending the flaps, turning, braking, air maneuvers, etc.) on the oil volume. The onboard computer FDIMU senses the working status of the aircraft hydraulic system, uses the preset model to obtain key parameters and trigger messages, and uses the ACARS system to send them to the ground control center in real time. The hydraulic oil leakage alarm message is transmitted to the ground control end in real time for early warning, so that the ground control end can take response measures in time in an emergency. The normal message is automatically generated after each flight segment and sent to the ground control center. The working status of the hydraulic system of the aircraft within a period is monitored, and the deficiencies of the alarm message are improved to ensure that the hydraulic system leakage can be fully identified, so as to know the existence of hydraulic oil leakage in advance and accurately.

[0042] In addition, the monitoring system and method provided by the present invention also have the following advantages:

[0043] 1. The hydraulic oil leakage monitoring system for the A320 hydraulic system provided by the present invention adopts ACARS to realize the reception and transmission of messages, that is, the ground control end adopts the ACARS system, and the data collection and completion are both carried out in real time, keeping synchronization with the aircraft, so there is no delay, which improves the overall synchronization performance;

[0044] 2. The present invention adopts relatively mature devices, such as the onboard computer flight data interface unit FDIMU (onboard computer FDIMU), mobile phone, mailbox, etc., which is low in cost and high in reliability;

[0045] 3. The hydraulic oil leakage normal message trigger model and the hydraulic oil leakage alarm message trigger model in the present invention both have preset message logics, and the preset models can be installed on other aircraft of the same configuration, that is, using a point / surface mode, the number of aircraft can be increased without restriction, and it has good scalability, which is convenient for large fleet operations.

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for monitoring hydraulic oil leakage in an A320 hydraulic system, characterized in that: The following steps are involved: S1, obtaining oil volume parameter data and auxiliary parameter data of the A320 hydraulic system; S2, based on the oil quantity parameter data, using the preset hydraulic oil leakage normal message trigger model to obtain and send a normal message, and at the same time, using the preset hydraulic oil leakage alarm message trigger model to determine whether the current oil quantity parameter data exceeds the current preset threshold value, if yes, then execute S3, otherwise return to S1, wherein the preset threshold value is corrected by the current auxiliary parameter data; S3, generating and sending a hydraulic oil leakage alarm message based on the current oil volume parameter data and auxiliary parameter data; S4, receiving and parsing the current normal message and the hydraulic oil leakage alarm message, and using the normal message to correct and filter the current hydraulic oil leakage alarm message to obtain a valid message; S5, display and send the valid message.

2. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 1, characterized in that: The fuel quantity parameter data includes a first fuel quantity difference and a second fuel quantity difference. The first fuel quantity difference is the difference of the same fuel quantity parameter within a preset first time interval during the flight operation, and the second fuel quantity difference is the difference of the same fuel quantity parameter between the flight starting point and the flight ending point.

3. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 2, characterized in that: The S3 specifically includes: Get the landing gear handle position data; When the landing gear handle position data meets the preset position condition and the first oil quantity difference exceeds the current first preset threshold, the generation time of the hydraulic oil leakage alarm message is determined, and the hydraulic oil leakage alarm message is generated starting from the generation time.

4. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 2, characterized in that: The S3 specifically includes: Get the current A320 hydraulic system pressure; When the A320 hydraulic system pressure is less than or equal to 100, and the second oil quantity difference exceeds the current second preset threshold, a hydraulic oil leakage alarm message is generated.

5. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 1, characterized in that: When the A320 hydraulic system is a green system or a yellow system, the auxiliary parameter data includes landing gear handle position data, aircraft braking data and turning data.

6. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 1, characterized in that: The normal message is captured by the hydraulic oil leakage normal message triggering model at the best time point of each flight segment, and the best time point is the working time of the A320 hydraulic system.

7. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 6, characterized in that: The normal message is generated and sent after each flight segment ends.

8. The method for monitoring hydraulic oil leakage for an A320 hydraulic system according to claim 1, characterized in that: The hydraulic oil leakage normal message trigger model and the hydraulic oil leakage alarm message trigger model are established through big data collection and analysis.

9. A hydraulic oil leakage monitoring system for an A320 hydraulic system, characterized in that: The system is used to implement the method according to any one of claims 1 to 8, comprising a data acquisition and processing module and a message parsing and display module connected in communication; The data acquisition and processing module is used to obtain the oil quantity parameter data and auxiliary parameter data of the A320 hydraulic system; based on the oil quantity parameter data, a preset hydraulic oil leakage normal message trigger model is used to obtain and send a normal message, and at the same time, a preset hydraulic oil leakage alarm message trigger model is used to determine whether the current oil quantity parameter data exceeds the current preset threshold value, if yes, then based on the current oil quantity parameter data and auxiliary parameter data, a hydraulic oil leakage alarm message is generated and sent, otherwise the parameter data is re-acquired, wherein the preset threshold value is corrected by the current auxiliary parameter data; The message parsing and display module is used to receive and parse the current normal message and hydraulic oil leakage alarm message, use the normal message to correct and filter the current hydraulic oil leakage alarm message, and after obtaining the valid message, display and send the valid message.

10. The hydraulic oil leakage monitoring system for the A320 hydraulic system according to claim 9, characterized in that: The data acquisition and processing module includes ground loading equipment and an onboard computer flight data interface component, and the message parsing and display module includes an aircraft communication addressing and reporting system and a ground control terminal.

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