An aircraft brake pressure servo valve contamination tolerance test system

Abstract

This invention belongs to the field of aviation hydraulics and realizes the inspection of the performance of pressure servo valves and the assessment of their tolerance to polluted environments. It relates to a pollution tolerance test system for aircraft brake pressure servo valves, comprising: a pressure servo valve (7) mounted on a pressure servo valve mounting platform (5); the pressure supply port of the pressure servo valve (7) connected to the oil supply outlet of a high-pressure hydraulic oil source system (1); the return port of the pressure servo valve (7) connected to the return port of the high-pressure hydraulic oil source system (1); the brake port of the pressure servo valve (7) connected to the hydraulic interface of the wheel (8); an oil contamination control facility (2) connected to the oil tank of the high-pressure hydraulic oil source system (1); and electrical interfaces of the high-pressure hydraulic oil source system (1), the oil contamination control facility (2), and the pressure servo valve (7) connected to a real-time monitoring and control system (4). This invention is applicable to various aircraft.

Description

Technical Field

[0001] This invention belongs to the field of aviation hydraulics and relates to a contamination tolerance test system for an aircraft brake pressure servo valve. Background Technology

[0002] The braking system plays a crucial role in the safe takeoff and landing of aircraft, and outputting the corresponding braking pressure as instructed is a key requirement of the system. The electro-hydraulic pressure servo valve used to regulate braking pressure in the braking system has a delicate internal structure and is sensitive to oil contaminants. During use, contamination can easily cause malfunctions. Therefore, there is an urgent need for a test method to simulate the onboard environment to evaluate the contamination tolerance of the electro-hydraulic pressure servo valve, serving as a basis for the contamination resistance of the electro-hydraulic servo valve and for the system's contamination-proof design, use, and maintenance. Summary of the Invention

[0003] The purpose of this invention is to provide a contamination tolerance test system for aircraft brake pressure servo valves, enabling the inspection of the performance of pressure servo valves and the evaluation of their tolerance to polluted environments.

[0004] The technical solution of the present invention:

[0005] A contamination tolerance test system for an aircraft brake pressure servo valve includes:

[0006] High-pressure hydraulic oil source system 1. Oil contamination control facility 2. Oil contamination online monitoring system 3. Real-time measurement and control system 4. Pressure servo valve installation platform 5. Servo valve testing equipment 6. Pressure servo valve 7. Machine wheel 8. Pressure sensor 11.

[0007] The pressure servo valve 7 is installed on the pressure servo valve mounting platform 5. The pressure supply port of the pressure servo valve 7 is connected to the oil supply outlet of the high-pressure hydraulic oil source system 1 through the hydraulic pipeline 9. The return port of the pressure servo valve 7 is connected to the return port of the high-pressure hydraulic oil source system 1 through the hydraulic pipeline 9. The brake port of the pressure servo valve 7 is connected to the hydraulic interface of the wheel 8 through the hydraulic pipeline 9. The oil contamination online monitoring system 3 is connected to the pressure supply port pipeline of the pressure servo valve 7 through the adapter and the hydraulic pipeline 9. Pressure sensors 11 are installed on the pressure supply port pipeline, return pipeline, and brake port pipeline of the pressure servo valve 7 through the adapter. The oil contamination control facility 2 is connected to the oil tank of the high-pressure hydraulic oil source system 1 through the hydraulic pipeline 9. The electrical interfaces of the high-pressure hydraulic oil source system 1, the oil contamination control facility 2, all pressure sensors 11, and the pressure servo valve 7 are connected to the real-time measurement and control system 4 through the cable 10. The electrical interface of the pressure servo valve 7 can also be connected to the servo valve testing equipment 6 through the cable 10.

[0008] Real-time monitoring and control system 4 includes:

[0009] The control and measurement chassis 4.1 contains a data acquisition board 4.1.1, a digital-to-analog signal conversion board 4.1.2, a host computer 4.2, and a host computer display interface 4.3. The display interface mainly includes a servo valve control command setting box and command signal curve 4.3.1, an oil solid particulate matter quantity and contamination level curve 4.3.2, and a pressure servo valve pressure curve 4.3.3.

[0010] The online oil contamination monitoring system 3, pressure sensor 11, and high-pressure hydraulic oil source system 1 are connected to the data acquisition board 4.1.1 via cables. The digital-to-analog signal conversion board 4.1.2 is connected to the pressure servo valve 7 via cables. The data acquisition board 4.1.1 and the digital-to-analog signal conversion board 4.1.2 are connected to the measurement and control chassis 4.1 via internal slots. The measurement and control chassis 4.1 is connected to the host computer 4.2 via cables. The host computer 4.2 sends power to the display interface 4.3 via cables.

[0011] The electrical signal indicating pressure from pressure sensor 11 is transmitted via cable to the data acquisition board 4.1.1, where it is converted into a digital signal and transmitted to the host computer 4.2. After being processed by the host computer, the pressure curve of the pressure servo valve is displayed on the display interface 4.3.

[0012] The signal indicating the number of solid particulate matter in the online oil contamination monitoring system 3 is transmitted to the data acquisition board 4.1.1 via cable. After being processed by the host computer, the signal is displayed on the display interface 4.3 as a curve showing the number of solid particulate matter in the oil and the contamination level 4.3.2.

[0013] The current signal from the pressure servo valve 7 is transmitted via cable to the data acquisition board 4.1.1, where it is converted into a digital signal and transmitted to the host computer 4.2. After plotting and processing by the host computer, the curve is displayed on the display interface 4.3 in the servo valve control command setting box and the command signal curve 4.3.1. Commands are input via the host computer 4.2 into the command boxes of the servo valve control command setting box and the command signal curve 4.3.1 on the display interface 4.3. After data processing, the signals are transmitted to the digital-to-analog signal conversion board 4.1.2 in the control and measurement chassis 4.1, where they are converted into a current signal and transmitted via cable to the pressure servo valve 7 to control the pressure output.

[0014] After the high-pressure hydraulic oil source system 1 starts working, the high-pressure hydraulic oil enters the pressure sensor 11 through the oil supply outlet of the high-pressure hydraulic oil source system 1 and the hydraulic pipeline 9, which converts the oil into an electrical signal indicating the pressure. The oil then enters the oil contamination control facility 2 to obtain the hydraulic oil contamination level and enters the pressure servo valve 7 supply port to supply pressure to the pressure servo valve 7. The hydraulic oil then enters the pressure sensor 11 through the hydraulic pipeline 9 through the return port of the pressure servo valve 7, which converts the oil into an electrical signal indicating the pressure and enters the return port of the high-pressure hydraulic oil source system 1.

[0015] When braking, hydraulic oil flows from the brake port of pressure servo valve 7 through hydraulic pipeline 9 into pressure sensor 11, which converts into an electrical signal indicating pressure. This signal then enters the hydraulic interface of wheel 8 to push the piston to brake. When releasing the brake, hydraulic oil flows from the hydraulic interface of wheel 8 through hydraulic pipeline 9 into pressure sensor 11, which converts into an electrical signal indicating pressure. This signal then enters the brake port of pressure servo valve 7.

[0016] Oil contamination control facility 2 adds contaminant concentrate to the return oil line of high-pressure hydraulic oil source system 1 through hydraulic line 9. The oil containing contaminants enters the oil tank through the return oil line of high-pressure hydraulic oil source system 1; or oil contamination control facility 2 opens the internal filter circulation bypass, and the hydraulic oil of high-pressure hydraulic oil source system 1 enters the internal filter circulation bypass of oil contamination control facility 2 through hydraulic line 9 for filtration, and then enters the oil tank.

[0017] Based on the real oil contamination result measured by the real-time monitoring and control system 4 from the online oil contamination monitoring system 3, the pollutant concentrate is dynamically added or the filter bypass is opened; to ensure that the number of oil particles and the oil contamination degree per unit volume meet the test requirements during the test.

[0018] The requirements for dynamically adding contaminant concentrate or opening the filter bypass are as follows: before the oil particulate matter contamination level changes, add contaminant concentrate when the amount reaches 40% of the lower limit specified for the contamination level; open the filter bypass when the amount reaches 70% of the upper limit specified for the contamination level; the observation and control system 4 obtains real-time data from the online oil contamination monitoring system 3, and stops adding contaminant concentrate once the amount of particulate matter meets the requirements; the observation and control system 4 obtains real-time data from the online oil contamination monitoring system 3, and closes the bypass once the amount of particulate matter meets the requirements.

[0019] The real-time monitoring and control system 4 sends a current control command to the pressure servo valve 7 via cable 10 to control the pressure of the output brake port; or the servo valve testing equipment 6 sends a current control command to the pressure servo valve 7 via cable 10 to control the pressure of the output brake port.

[0020] The beneficial effects of this invention are as follows: By establishing a test method to simulate the oil contamination environment during the operation of an aircraft brake pressure servo valve in an onboard system, the performance of the pressure servo valve can be checked and its tolerance to contamination can be evaluated under this environment. This method has been applied to the contamination tolerance test of a certain type of brake electro-hydraulic pressure servo valve, realizing the assessment of the contamination tolerance of the brake electro-hydraulic pressure servo valve. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the composition and control principle of the contamination tolerance test system for the aircraft brake pressure servo valve of this patent.

[0022] Figure 2 This diagram shows the installation requirements for the pressure servo valve tested in this patent application.

[0023] Figure 3 This is a schematic diagram of the control system for the contamination tolerance test of the brake pressure servo valve, which is the subject of this patent.

[0024] Figure 4 This is a test command spectrum for the pressure servo valve control in this patent. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] A contamination tolerance test system for aircraft brake pressure servo valves, such as Figure 1 As shown, it includes:

[0027] High-pressure hydraulic oil source system 1. Oil contamination control facility 2. Oil contamination online monitoring system 3. Real-time measurement and control system 4. Pressure servo valve installation platform 5. Servo valve testing equipment 6. Pressure servo valve 7. Machine wheel 8. Pressure sensor 11.

[0028] The pressure servo valve 7 is installed on the pressure servo valve mounting platform 5. The pressure servo valve mounting platform 5 should ensure that the height difference h between the pressure servo valve 7 and the wheel 8 is consistent with that on the machine. The mounting point of the pressure servo valve 7 is determined and set, referring to... Figure 2The pressure servo valve 7's supply port is connected to the oil supply outlet of the high-pressure hydraulic oil source system 1 via hydraulic pipeline 9. The return port of the pressure servo valve 7 is also connected to the return port of the high-pressure hydraulic oil source system 1 via hydraulic pipeline 9. The brake port of the pressure servo valve 7 is connected to the hydraulic interface of the impeller 8 via hydraulic pipeline 9. The inner and outer diameters and material specifications of the hydraulic pipeline 9 connecting the pressure servo valve 7 and the impeller 8 should be consistent with those on the machine. The length, inner and outer diameters, and material specifications of the hydraulic pipeline connecting the pressure servo valve 7 and the impeller 8 should also be consistent with those on the machine. The oil contamination online monitoring system 3 is connected to the pressure servo valve 7's supply port via an adapter and hydraulic pipeline 9. The oil contamination online monitoring system 3 is equipped with the pressure servo valve 7. On the oil supply line, it should be placed as close as possible to the pressure servo valve 7 without affecting its operation. Pressure sensors 11 are installed on the pressure supply port line, return oil line, and brake port line connected to the pressure servo valve 7 via adapters. Temperature and flow sensors are arranged in the system according to the needs of the test. The oil contamination control facility 2 is connected to the oil tank of the high-pressure hydraulic oil source system 1 via hydraulic line 9. The electrical interfaces of the high-pressure hydraulic oil source system 1, the oil contamination control facility 2, all pressure sensors 11, and the pressure servo valve 7 are connected to the real-time measurement and control system 4 via cable 10. The electrical interface of the pressure servo valve 7 can also be connected to the servo valve testing equipment 6 via cable 10.

[0029] like Figure 3 As shown, the real-time monitoring and control system 4 includes:

[0030] The control and measurement chassis 4.1 contains a data acquisition board 4.1.1, a digital-to-analog signal conversion board 4.1.2, a host computer 4.2, and a host computer display interface 4.3. The display interface mainly includes a servo valve control command setting box and command signal curve 4.3.1, an oil solid particulate matter quantity and contamination level curve 4.3.2, and a pressure servo valve pressure curve 4.3.3.

[0031] The online oil contamination monitoring system 3, pressure sensor 11, and high-pressure hydraulic oil source system 1 have their electrical interfaces connected to the data acquisition board 4.1.1 via cables. The digital-to-analog signal conversion board 4.1.2 is connected to the pressure servo valve 7 via cables. The data acquisition board 4.1.1 and the digital-to-analog signal conversion board 4.1.2 are connected to the control and measurement chassis 4.1 via internal slots. The control and measurement chassis 4.1 is connected to the host computer 4.2 via cables. The host computer 4.2 sends signals to the display interface 4.3 via cables.

[0032] The real-time monitoring and control system 4 is powered on first. After startup, it sends a start command to the high-pressure hydraulic oil source system 1. After the high-pressure hydraulic oil source system 1 starts working, the real-time monitoring and control system 4 sends a speed adjustment signal until the oil pump of the high-pressure hydraulic oil source system 1 reaches a stable speed. The speed, temperature, and pressure signals in the high-pressure hydraulic oil source system 1 are also output to the real-time monitoring and control system 4 for display via cable. The high-pressure hydraulic oil enters the pressure sensor 11 through the oil supply outlet of the high-pressure hydraulic oil source system 1 and is converted into an electrical signal indicating the pressure via the hydraulic pipeline 9. This signal then enters the oil contamination degree online monitoring system 3 to obtain the hydraulic oil contamination degree level and enters the pressure servo valve 7 for pressure supply. The pressure servo valve 7 supplies pressure; hydraulic oil from the return port of the pressure servo valve 7 enters the pressure sensor 11 through the hydraulic pipeline 9 and is converted into an electrical signal indicating the pressure, which then enters the return port of the high-pressure hydraulic oil source system 1; the electrical signal indicating the pressure from the pressure sensor 11 is transmitted to the data acquisition board 4.1.1 via cable and converted into a digital signal, which is then transmitted to the host computer 4.2. After the host computer performs drawing processing, the signal is displayed on the display interface 4.3. The normal operation of the high-pressure hydraulic oil source system 1 is confirmed by the displayed servo valve supply and return pressures. Visual inspection of all hydraulic pipeline 9 connections reveals no oil leakage, confirming that the high-pressure hydraulic oil source system 1 is operating normally.

[0033] The signal indicating the number of solid particulate matter in the online oil contamination monitoring system 3 is transmitted to the data acquisition board 4.1.1 via cable. After being plotted and processed by the host computer, the signal is displayed on the display interface 4.3 showing the number of solid particulate matter and the contamination level curve 4.3.2. Based on the real oil contamination result measured by the online oil contamination monitoring system 3 from the real-time measurement and control system 4, the system dynamically adds contaminant concentrate or opens the filter bypass. This ensures that the number of oil particulate matter and the oil contamination level per unit volume meet the test requirements during the test. The dynamic control requirement is that before the oil solid particulate matter contamination level changes, it generally reaches 40% of the lower limit of the contamination level as a typical value, and adjustments can be made according to the actual situation to add contaminant concentrate. When it reaches 70% of the upper limit of the contamination level as a typical value, adjustments can be made according to the actual situation to open the filter bypass. Adding contaminant concentrate aims to increase the number of contaminant particles per unit volume in the oil. The total amount of concentrate added each time should not exceed the amount that would change the current oil contamination level. When adding concentrate, it should be done gradually, and real-time data obtained from the online oil contamination monitoring system 3 should be observed by the monitoring and control system 4. Adding should stop once the required number of solid particles is reached. Opening the filter bypass aims to filter and reduce the number of contaminant particles in the high-pressure hydraulic oil source system 1. When opening the bypass, real-time data obtained from the online oil contamination monitoring system 3 should be observed by the monitoring and control system 4. The bypass should be closed once the required number of solid particles is reached. The high-pressure hydraulic oil source system 1 should be able to operate for an extended period under the contamination level conditions set in the test, and sufficient spare hydraulic pumps should be available to ensure the test can proceed.

[0034] Once the high-pressure hydraulic oil source system 1 provides stable pressure and the contamination level meets the test requirements, the data is first saved on the display interface 4.3 via the upper computer input device 4.2. Then, command parameters are input into the servo valve control command setting box and the command signal curve 4.3.1 command box. The average switching frequency 24 of the maximum brake pressure command 21 and brake release command 22 during each takeoff and landing, and the average switching frequency 25 of the rated brake pressure command 23 and brake release command 22 during each takeoff and landing, obtained from actual flight data statistics, are input to form a cyclic command spectrum, such as... Figure 4As shown, after the command spectrum is saved, an alarm value can be set through the corresponding brake pressure index. If the alarm value is continuously exceeded, a text prompt will be displayed on the interface. After setting, the command spectrum is confirmed and the command is output. After data processing, it is transmitted to the digital-to-analog signal conversion board 4.1.2 in the control and measurement box 4.1, converted into a current signal, and transmitted to the pressure servo valve 7 via cable to control the pressure output. When braking, hydraulic oil enters the pressure sensor 11 from the brake port of the pressure servo valve 7 through the hydraulic pipeline 9, and is converted into an electrical signal indicating the pressure. This signal then enters the hydraulic interface of the wheel 8 to push the piston brake. When releasing the brake, hydraulic oil enters the pressure sensor 11 from the hydraulic interface of the wheel 8 through the hydraulic pipeline 9, and is converted into an electrical signal indicating the pressure. This signal then enters the brake port of the pressure servo valve 7. In addition, the servo valve testing equipment 6 can further test the performance of the servo valve when connected to the electro-hydraulic pressure servo valve 7. The servo valve testing equipment is consistent with the equipment used by the brake pressure servo valve manufacturer to test the product performance indicators. It can detect various output indicators of the brake pressure servo valve so as to compare the indicators on the same platform.

[0035] During the test, the supply pressure, return oil, and brake pressure signals, contamination level, command current signal, and pressure, temperature, and speed signals of the high-pressure hydraulic oil source system 1 are monitored through the display interface 4.3. The contamination level is continuously stabilized through the oil contamination control facility 2. The test stops when the specified requirements are met or when an alarm is triggered and confirmed by the electro-hydraulic pressure servo valve 7. All recorded test data can be replayed through the host computer 4.2.

[0036] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An aircraft brake pressure servo valve contamination tolerance test system characterized by, include: High-pressure hydraulic oil source system (1), oil contamination control facility (2), oil contamination online monitoring system (3), real-time measurement and control system (4), pressure servo valve installation platform (5), servo valve testing equipment (6), pressure servo valve (7), impeller (8), pressure sensor (11); The pressure servo valve (7) is installed on the pressure servo valve mounting platform (5). The pressure supply port of the pressure servo valve (7) is connected to the oil supply outlet of the high-pressure hydraulic oil source system (1) through the hydraulic pipeline (9). The return port of the pressure servo valve (7) is connected to the return port of the high-pressure hydraulic oil source system (1) through the hydraulic pipeline (9). The brake port of the pressure servo valve (7) is connected to the hydraulic interface of the wheel (8) through the hydraulic pipeline (9). The oil contamination online monitoring system (3) is connected to the pressure supply port pipeline of the pressure servo valve (7) through the adapter and the hydraulic pipeline (9). Pressure sensors (11) are installed on the pressure supply port pipeline, return oil pipeline and brake port pipeline of the pressure servo valve (7) through adapters. The oil contamination control facility (2) is connected to the oil tank of the high-pressure hydraulic oil source system (1) through the hydraulic pipeline (9). The electrical interfaces of the high-pressure hydraulic oil source system (1), the oil contamination control facility (2), all pressure sensors (11) and the pressure servo valve (7) are connected to the real-time measurement and control system (4) through the cable (10). The electrical interface of the pressure servo valve (7) is connected to the servo valve testing equipment (6) through the cable (10). The oil contamination control facility (2) adds contaminant concentrate to the return oil line of the high-pressure hydraulic oil source system (1) through the hydraulic pipeline (9). The oil containing contaminants enters the oil tank through the return oil of the high-pressure hydraulic oil source system (1); or the oil contamination control facility (2) opens the internal filter circulation bypass, and the hydraulic oil of the high-pressure hydraulic oil source system (1) enters the internal filter circulation bypass of the oil contamination control facility (2) through the hydraulic pipeline (9) for filtration, and then enters the oil tank. Based on the real oil contamination result measured by the real-time monitoring and control system (4) from the online oil contamination monitoring system (3), the pollutant concentrate is dynamically added or the filter bypass is opened; to ensure that the number of oil particles and the oil contamination degree per unit volume meet the test requirements during the test. The requirements for dynamically adding contaminant concentrate or opening the filter bypass are as follows: before the oil solid particulate matter pollution level changes, add contaminant concentrate when the amount reaches 40% of the lower limit specified for the pollution level; open the filter bypass when the amount reaches 70% of the upper limit specified for the pollution level. Observe the real-time data obtained by the real-time measurement and control system (4) from the online oil contamination monitoring system (3). If the amount of solid particles meets the requirements, stop adding. Observe the real-time data obtained by the real-time measurement and control system (4) from the online oil contamination monitoring system (3). If the amount of solid particles meets the requirements, close the bypass.

2. A system for testing the contamination tolerance of an aircraft brake pressure servo valve as in claim 1, wherein, The real-time measurement and control system (4) includes: a measurement and control chassis (4.1), a host computer (4.2), and a host computer display interface (4.3); The control and measurement chassis includes a data acquisition board (4.1.1) and a digital-to-analog signal conversion board (…). 4.1.2) The host computer display interface includes a servo valve control command setting box and command signal curve (4.3.1), oil solid particulate matter quantity and contamination level curve (4.3.2), and pressure servo valve pressure curve (4.3.3). The online oil contamination monitoring system (3), pressure sensor (11), and high-pressure hydraulic oil source system (1) are connected to the data acquisition board via cables. 4.1.1) Connected, the digital-to-analog signal conversion board (4.1.2) is connected to the electrical interface of the pressure servo valve (7) via a cable; the data acquisition board (4.1.1) and the digital-to-analog signal conversion board (4.1.2) are connected to the measurement and control chassis (4.1) via internal slots; the measurement and control chassis (4.1) is connected to the host computer (4.2) via a cable; the host computer (4.2) sends data to the display interface (4.3) via a cable.

3. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 2, characterized in that, The electrical signal indicating pressure from the pressure sensor (11) is transmitted to the data acquisition board (4.1.1) via cable, converted into a digital signal, and transmitted to the host computer (4.2). After the host computer performs plotting processing, the pressure curve of the pressure servo valve (4.3.3) is displayed on the display interface (4.3).

4. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 2, characterized in that the signal indicating the number of solid contaminant particles in the online oil contamination monitoring system (3) is transmitted to the data acquisition board (4.1.1) via cable, and after being plotted by the host computer, the number of solid contaminant particles and the contamination level curve (4.3.2) of the oil are displayed on the display interface (4.3).

5. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 2, characterized in that the current signal of the pressure servo valve (7) is transmitted to the data acquisition board (4.1.1) via cable and converted into a digital signal, which is then transmitted to the host computer (4.2). After the host computer performs drawing processing, the curve is displayed in the servo valve control command setting box and the command signal curve (4.3.1) on the display interface (4.3). The host computer (4.2) inputs the command in the command box of the servo valve control command setting box and the command signal curve (4.3.1) on the display interface (4.3). After data processing, the command is transmitted to the digital-to-analog signal conversion board (4.1.2) in the control and measurement box (4.1) and converted into a current signal, which is then transmitted to the pressure servo valve (7) via cable to control the pressure output.

6. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 1, characterized in that, After the high-pressure hydraulic oil source system (1) starts working, the high-pressure hydraulic oil enters the pressure sensor (11) through the oil supply outlet of the high-pressure hydraulic oil source system (1) and enters the hydraulic pipeline (9) to be converted into an electrical signal indicating the pressure. It then enters the oil contamination control facility (2) to obtain the hydraulic oil contamination level and enters the pressure servo valve (7) supply port to supply pressure to the pressure servo valve (7). The hydraulic oil returns from the pressure servo valve (7) through the hydraulic pipeline (9) and enters the pressure sensor (11) to be converted into an electrical signal indicating the pressure. It then enters the return port of the high-pressure hydraulic oil source system (1).

7. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 1, characterized in that, When braking, hydraulic oil flows from the brake port of the pressure servo valve (7) through the hydraulic pipeline (9) into the pressure sensor (11), which converts into an electrical signal indicating the pressure, and then into the hydraulic interface of the wheel (8) to push the piston to brake; when releasing the brake, hydraulic oil flows from the hydraulic interface of the wheel (8) through the hydraulic pipeline (9) into the pressure sensor (11), which converts into an electrical signal indicating the pressure, and then into the brake port of the pressure servo valve (7).

8. The contamination tolerance test system for an aircraft brake pressure servo valve as described in claim 1, characterized in that, The real-time measurement and control system (4) sends a current control command to the pressure servo valve (7) via cable (10) to control the pressure of the output brake port; or the servo valve testing equipment (6) sends a current control command to the pressure servo valve (7) via cable (10) to control the pressure of the output brake port.

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