A health monitoring device and method for an aircraft hydraulic system

Abstract

This invention belongs to the technical field of aircraft hydraulic systems, and particularly relates to a health monitoring device and method for aircraft hydraulic systems. The device includes: a hydraulic oil tank, a liquid level sensor, a temperature sensor, a hydraulic pump, a first pressure sensor, a first flow sensor, a check valve, a first differential pressure sensor, a safety valve, a second flow sensor, a pressure oil filter, an accumulator, a pressure switch, a second pressure sensor, a return oil filter, an actuator, a second differential pressure sensor, and a third differential pressure sensor; accurately monitoring the service life of hydraulic components.

Description

Technical Field

[0001] This invention belongs to the field of aircraft hydraulic system technology, and particularly relates to an aircraft hydraulic system health monitoring device and method. Background Technology

[0002] Existing aircraft hydraulic systems lack timely and effective health monitoring devices, particularly for monitoring the lifespan and malfunctions of hydraulic components. The lifespan of hydraulic components includes operating hours and number of operations, which were previously calculated using flight hours, a method that is not very accurate. Furthermore, existing aircraft hydraulic systems lack timely and effective means of monitoring component malfunctions, meaning that a faulty hydraulic component is only discovered when a function of the hydraulic system fails, significantly increasing aircraft operating and maintenance costs. Summary of the Invention

[0003] The technical problems solved by this invention are: (1) The service life of existing aircraft hydraulic components is usually calculated based on flight hours, which is not very accurate. This invention can more accurately monitor the service life of hydraulic components and provide warning information about the end of the service life of hydraulic components; (2) Existing aircraft hydraulic systems lack timely and effective monitoring methods for hydraulic component failures, so that the relevant hydraulic components are only found to be in a faulty state when a certain function of the hydraulic system is lost, which greatly increases the operating and maintenance costs of aircraft; (3) The failure mechanism of aircraft hydraulic systems is relatively complex, and fault diagnosis is often very difficult after a fault occurs. This invention can accurately locate faults based on the status information of the product, thereby improving the fault diagnosis level of hydraulic systems.

[0004] The technical solution of this invention:

[0005] In a first aspect, the present invention provides a health monitoring device for an aircraft hydraulic system, the device comprising:

[0006] Hydraulic oil tank 1, liquid level sensor 2, temperature sensor 3, hydraulic pump 4, first pressure sensor 5, first flow sensor 6, check valve 7, first differential pressure sensor 8, safety valve 9, second flow sensor 10, pressure oil filter 11, accumulator 12, pressure switch 13, second pressure sensor 14, return oil filter 15, actuator cylinder 16, second differential pressure sensor 17, third differential pressure sensor 18;

[0007] Port A of hydraulic oil tank 1 is connected to temperature sensor 3, and liquid level sensor 2 is installed inside hydraulic oil tank 1.

[0008] The A port of hydraulic pump 4 is connected to the A port of hydraulic oil tank 1, and the B port of hydraulic pump 4 is connected to the A port of first pressure sensor 5, first flow sensor 6, and one-way valve 7.

[0009] Port B of check valve 7 is connected to port A of pressure oil filter 11 and port A of safety valve 9; port A of first differential pressure sensor 8 is connected to port A of check valve 7, and port B of first differential pressure sensor 8 is connected to port B of check valve 7.

[0010] Port B of safety valve 9 is connected to port A of second flow sensor 10, return oil filter 15, and port B of actuator cylinder 16;

[0011] The B port of the pressure oil filter 11 is connected to the accumulator 12;

[0012] The A port of the second differential pressure sensor 17 is connected to the A port of the pressure oil filter 11, and the B port of the second differential pressure sensor 17 is connected to the B port of the pressure oil filter 11.

[0013] The accumulator 12 is connected to the pressure switch 13, the second pressure sensor 14, and port A of the actuator 16;

[0014] Port B of the return oil filter 15 is connected to port B of the hydraulic oil tank 1;

[0015] Port A of the third differential pressure sensor 18 is connected to port A of the return oil filter 15, and port B of the third differential pressure sensor 18 is connected to port B of the return oil filter 15.

[0016] Furthermore,

[0017] Temperature sensor 3 is used to monitor the outlet oil temperature of hydraulic oil tank 1, transmit the data to the data acquisition and management system, and give a prompt or alarm message when the oil temperature reaches a certain specified value.

[0018] The liquid level sensor 2 is used to monitor the liquid level in the hydraulic oil tank 1, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the liquid level in the hydraulic oil tank 1 reaches a certain specified value.

[0019] Furthermore,

[0020] The first pressure sensor 5 is used to monitor the outlet pressure of the hydraulic pump 4, and the first flow sensor 6 is used to monitor the outlet flow of the hydraulic pump 4. The data is transmitted to the data acquisition and management system, and prompts or alarms are given when the outlet pressure and flow of the hydraulic pump 4 are abnormal.

[0021] Furthermore,

[0022] The first differential pressure sensor 8 is used to monitor the pressure difference between the inlet and outlet of the check valve 7, transmit the data to the data acquisition and management system, and give a prompt or alarm message when the pressure difference between the inlet and outlet of the check valve 7 reaches a certain specified value.

[0023] The second flow sensor 10 is used to monitor the outlet flow of the safety valve 9, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the inlet and outlet flow of the safety valve 9 is abnormal.

[0024] Furthermore,

[0025] The pressure oil filter 11 is used to filter the flowing pressure oil, maintain the cleanliness of the oil, and monitor the oil contamination level of the hydraulic system. When the oil contamination level reaches a certain level, it will give a prompt or alarm message.

[0026] The second differential pressure sensor 17 is used to monitor the pressure difference between the inlet and outlet of the pressure oil filter 11, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the pressure difference between the inlet and outlet of the pressure oil filter 11 reaches a certain specified value.

[0027] Furthermore,

[0028] Pressure switch 13 is used to control the start and stop of hydraulic pump 4. Each time pressure switch 13 switches, it provides a signal to data acquisition and management system. The data acquisition and management system records the number of times pressure switch 13 operates, the working time of hydraulic pump 4, and the working time of accumulator 12, and monitors the service life of these hydraulic components. When the service life of the hydraulic components reaches 80%, a prompt message is given.

[0029] Furthermore,

[0030] The second pressure sensor 14 is used to monitor the hydraulic pressure of the accumulator 12, transmit the data to the data acquisition and management system, and give a prompt or alarm message when the hydraulic pressure of the accumulator 12 reaches a certain specified value.

[0031] Furthermore,

[0032] The return oil filter 15 is used to filter the hydraulic oil flowing back to the hydraulic oil tank 1, maintain the cleanliness of the oil, and monitor the oil contamination level of the hydraulic system. When the oil contamination level reaches a certain level, it will give a prompt message or alarm message.

[0033] Furthermore,

[0034] The third differential pressure sensor 18 is used to monitor the pressure difference between the inlet and outlet of the return oil filter 15, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the pressure difference between the inlet and outlet of the return oil filter 15 reaches a certain specified value.

[0035] Secondly, the present invention also provides a method for health monitoring of an aircraft hydraulic system, the method comprising:

[0036] When the actuator cylinder 16 is working, the accumulator 12 releases pressure to provide pressurized oil to the actuator cylinder 16. When the pressure released by the accumulator 12 reaches a certain specified value, the pressure switch 13 is triggered and controls the hydraulic pump 4 to start working. The hydraulic pump 4 draws oil from the hydraulic oil tank 1 and flows through the first pressure sensor 5, the first flow sensor 6, the check valve 7, and the pressure oil filter 11 to pressurize the accumulator 12. When the hydraulic pressure of the accumulator 12 rises to a certain specified value, the pressure switch 13 is triggered and controls the hydraulic pump 4 to stop working. The safety valve 9 is used to prevent system overpressure and plays a protective role.

[0037] The advantages of this invention are:

[0038] (1) This invention can more accurately monitor the service life of hydraulic components and provide a warning message when the hydraulic components are nearing the end of their service life. Based on the warning message, maintenance personnel can make full preparations for maintenance and repair in advance, which can greatly reduce operating and maintenance costs.

[0039] (2) The present invention can accurately locate faults based on the status information of the product, thereby improving the fault diagnosis level of the hydraulic system.

[0040] (3) Real-time monitoring of the usage status and fault conditions of hydraulic components can help detect potential faults and malfunctions in the hydraulic system in a timely manner, thereby reducing the occurrence of hydraulic system failures and lowering aircraft operation and maintenance costs. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the aircraft hydraulic system health monitoring device provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the electrical control cylinder structure provided in an embodiment of the present invention. Detailed Implementation

[0043] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] The principle of aircraft hydraulic system health monitoring provided in this embodiment of the invention is as follows: Figure 1 As shown, the simplified electrical control diagram is as follows: Figure 2 As shown.

[0045] The liquid level sensor 2 is used to monitor the liquid level in the hydraulic oil tank 1; the temperature sensor 3 is used to monitor the oil temperature at the outlet of the hydraulic oil tank 1; the first pressure sensor 5 is used to monitor the working pressure of the hydraulic pump 4; the first flow sensor 6 is used to monitor the working flow of the hydraulic pump 4; the first differential pressure sensor 8 is used to monitor the pressure difference between the inlet and outlet of the check valve 7; the second flow sensor 10 is used to monitor the outlet flow of the safety valve 9; the pressure oil filter 11 and the return oil filter 15 are used to monitor the oil contamination level in the hydraulic system; the second differential pressure sensor 17 is used to monitor the pressure difference between the inlet and outlet of the pressure oil filter 11; the third differential pressure sensor 18 is used to monitor the pressure difference between the inlet and outlet of the return oil filter 15; the pressure switch 13 is used to monitor the service life of the hydraulic pump 4 and the accumulator 12; and the second pressure sensor 14 is used to monitor the pressure of the accumulator 12.

[0046] Specifically, port A of hydraulic oil tank 1 is connected to temperature sensor 3. Temperature sensor 3 monitors the outlet oil temperature of hydraulic oil tank 1, transmits the data to the data acquisition and management system, and provides a prompt or alarm message when the oil temperature reaches a certain specified value. Liquid level sensor 2 is installed inside hydraulic oil tank 1 to monitor the liquid level height of hydraulic oil tank 1, transmits the data to the data acquisition and management system, and provides a prompt or alarm message when the liquid level height of hydraulic oil tank 1 reaches a certain specified value. Port A of hydraulic pump 4 is connected to port A of hydraulic oil tank 1, and port B of hydraulic pump 4 is connected to the first pressure sensor 5, the first flow sensor 6, and port A of check valve 7. The first pressure sensor 5 monitors the outlet pressure of hydraulic pump 4, the first flow sensor 6 monitors the outlet pressure of hydraulic pump 4, and port B of check valve 7. Sensor 6 is used to monitor the outlet flow of hydraulic pump 4, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the outlet pressure and flow of hydraulic pump 4 are abnormal; Port B of check valve 7 is connected to Port A of pressure oil filter 11 and Port A of safety valve 9; Port A of first differential pressure sensor 8 is connected to Port A of check valve 7, and Port B of first differential pressure sensor 8 is connected to Port B of check valve 7, used to monitor the pressure difference between the inlet and outlet of check valve 7, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the pressure difference between the inlet and outlet of check valve 7 reaches a certain specified value; Port B of safety valve 9 is connected to second flow sensor 10, Port A of return oil filter 15, and Port B of actuator cylinder 16, and second flow sensor 10 is ... The system monitors the outlet flow of safety valve 9, transmits the data to the data acquisition and management system, and provides prompt or alarm information when the inlet and outlet flow of safety valve 9 is abnormal. The B port of pressure oil filter 11 is connected to accumulator 12 to filter the flowing pressure oil, maintain oil cleanliness, and monitor the oil contamination level in the hydraulic system. When the oil contamination level reaches a certain level, it provides prompt or alarm information. The A port of the second differential pressure sensor 17 is connected to the A port of pressure oil filter 11, and the B port of the second differential pressure sensor 17 is connected to the B port of pressure oil filter 11. This is used to monitor the pressure difference between the inlet and outlet of pressure oil filter 11, transmit the data to the data acquisition and management system, and provide prompt or alarm information when the pressure difference between the inlet and outlet of pressure oil filter 11 reaches a certain specified value. The system provides prompts or alarms. The accumulator 12 is connected to the pressure switch 13, the second pressure sensor 14, and port A of the actuator 16. The pressure switch 13 controls the start and stop of the hydraulic pump 4. Each time the pressure switch 13 switches, it provides a signal to the data acquisition and management system. The system records the number of times the pressure switch 13 operates, the operating time of the hydraulic pump 4, and the operating time of the accumulator 12, monitoring the service life of these hydraulic components. When the service life of a hydraulic component reaches 80%, a prompt is given. The second pressure sensor 14 monitors the hydraulic pressure of the accumulator 12, transmits the data to the data acquisition and management system, and provides prompts or alarms when the hydraulic pressure of the accumulator 12 reaches a certain specified value.Port B of the return oil filter 15 is connected to port B of the hydraulic oil tank 1. It is used to filter the hydraulic oil flowing back to the hydraulic oil tank 1, maintaining the cleanliness of the oil and monitoring the oil contamination level in the hydraulic system. When the oil contamination level reaches a certain level, it provides a prompt or alarm message. Port A of the third differential pressure sensor 18 is connected to port A of the return oil filter 15, and port B of the third differential pressure sensor 18 is connected to port B of the return oil filter 15. It is used to monitor the pressure difference between the inlet and outlet of the return oil filter 15, transmit the data to the data acquisition and management system, and provide a prompt or alarm message when the pressure difference between the inlet and outlet of the return oil filter 15 reaches a certain specified value.

[0047] When the actuator cylinder 16 operates, the accumulator 12 releases pressure to supply pressurized oil to the actuator cylinder 16. When the pressure released by the accumulator 12 reaches a certain specified value, the pressure switch 13 is triggered and controls the hydraulic pump 4 to start working. The hydraulic pump 4 draws oil from the hydraulic oil tank 1, flows through the first pressure sensor 5, the first flow sensor 6, the check valve 7, and the pressure oil filter 11, and pressurizes the accumulator 12. When the hydraulic pressure of the accumulator 12 rises to a certain specified value, the pressure switch 13 is triggered and controls the hydraulic pump 4 to stop working. The safety valve 9 is used to prevent system overpressure and plays a protective role.

[0048] The data acquisition and management system is used to collect signal data from the aforementioned sensors and pressure switches, process the data, and display the working status information and service life of the hydraulic components on the system interface.

[0049] The advantages of this invention are:

[0050] (1) This invention can more accurately monitor the service life of hydraulic components and provide a warning message when the hydraulic components are nearing the end of their service life. Based on the warning message, maintenance personnel can make full preparations for maintenance and repair in advance, which can greatly reduce operating and maintenance costs.

[0051] (2) The present invention can accurately locate faults based on the status information of the product, thereby improving the fault diagnosis level of the hydraulic system.

[0052] (3) Real-time monitoring of the usage status and fault conditions of hydraulic components can help detect potential faults and malfunctions in the hydraulic system in a timely manner, thereby reducing the occurrence of hydraulic system failures and lowering aircraft operation and maintenance costs.

Claims

1. A health monitoring device for an aircraft hydraulic system, characterized in that, The device includes: Hydraulic oil tank (1), liquid level sensor (2), temperature sensor (3), hydraulic pump (4), first pressure sensor (5), first flow sensor (6), check valve (7), first differential pressure sensor (8), safety valve (9), second flow sensor (10), pressure oil filter (11), accumulator (12), pressure switch (13), second pressure sensor (14), return oil filter (15), actuator (16), second differential pressure sensor (17), third differential pressure sensor (18); The A port of the hydraulic oil tank (1) is connected to the temperature sensor (3), and the liquid level sensor (2) is installed inside the hydraulic oil tank (1); The A port of the hydraulic pump (4) is connected to the A port of the hydraulic oil tank (1), and the B port of the hydraulic pump (4) is connected to the A port of the first pressure sensor (5), the first flow sensor (6), and the one-way valve (7). The B port of the check valve (7) is connected to the A port of the pressure oil filter (11) and the A port of the safety valve (9); The A port of the first differential pressure sensor (8) is connected to the A port of the one-way valve (7), and the B port of the first differential pressure sensor (8) is connected to the B port of the one-way valve (7). The B port of the safety valve (9) is connected to the second flow sensor (10), the A port of the return oil filter (15), and the B port of the actuator (16); The B port of the pressure oil filter (11) is connected to the accumulator (12); The A port of the second differential pressure sensor (17) is connected to the A port of the pressure oil filter (11), and the B port of the second differential pressure sensor (17) is connected to the B port of the pressure oil filter (11). The accumulator (12) is connected to the pressure switch (13), the second pressure sensor (14), and the A port of the actuator (16); The B port of the return oil filter (15) is connected to the B port of the hydraulic oil tank (1); The A port of the third differential pressure sensor (18) is connected to the A port of the return oil filter (15), and the B port of the third differential pressure sensor (18) is connected to the B port of the return oil filter (15).

2. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The temperature sensor (3) is used to monitor the outlet oil temperature of the hydraulic oil tank (1), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the oil temperature reaches a certain specified value. The liquid level sensor (2) is used to monitor the liquid level in the hydraulic oil tank (1), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the liquid level in the hydraulic oil tank (1) reaches a certain specified value.

3. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The first pressure sensor (5) is used to monitor the outlet pressure of the hydraulic pump (4), and the first flow sensor (6) is used to monitor the outlet flow of the hydraulic pump (4). The data is transmitted to the data acquisition and management system, and prompts or alarms are given when the outlet pressure and flow of the hydraulic pump (4) are abnormal.

4. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The first differential pressure sensor (8) is used to monitor the pressure difference between the inlet and outlet of the check valve (7), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the pressure difference between the inlet and outlet of the check valve (7) reaches a certain specified value. The second flow sensor (10) is used to monitor the outlet flow of the safety valve (9), transmit the data to the data acquisition and management system, and provide prompt or alarm information when the inlet and outlet flow of the safety valve (9) is abnormal.

5. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The pressure oil filter (11) is used to filter the pressure oil flowing through it, maintain the cleanliness of the oil, and monitor the oil contamination level of the hydraulic system. When the oil contamination level reaches a certain level, it will give a prompt or alarm message. The second differential pressure sensor (17) is used to monitor the pressure difference between the inlet and outlet of the pressure oil filter (11), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the pressure difference between the inlet and outlet of the pressure oil filter (11) reaches a certain specified value.

6. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The pressure switch (13) is used to control the start and stop of the hydraulic pump (4). Each time the pressure switch (13) switches, it provides a signal to the data acquisition and management system. The data acquisition and management system records the number of times the pressure switch (13) works, the working time of the hydraulic pump (4), and the working time of the accumulator (12). It monitors the service life of these hydraulic components and gives a prompt message when the service life of the hydraulic components reaches 80%.

7. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The second pressure sensor (14) is used to monitor the hydraulic pressure of the accumulator (12), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the hydraulic pressure of the accumulator (12) reaches a certain specified value.

8. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The return oil filter (15) is used to filter the hydraulic oil flowing back to the hydraulic oil tank (1), maintain the cleanliness of the oil, and monitor the oil contamination level of the hydraulic system. When the oil contamination level reaches a certain level, it will give a prompt or alarm message.

9. The aircraft hydraulic system health monitoring device according to claim 1, characterized in that, The third differential pressure sensor (18) is used to monitor the pressure difference between the inlet and outlet of the return oil filter (15), transmit the data to the data acquisition and management system, and give a prompt or alarm message when the pressure difference between the inlet and outlet of the return oil filter (15) reaches a certain specified value.

10. A method for health monitoring of an aircraft hydraulic system, characterized in that, The method is applied to the apparatus as described in any one of claims 1-9, the method comprising: When the actuator (16) is working, the accumulator (12) releases pressure to provide pressurized oil to the actuator (16). When the pressure released by the accumulator (12) reaches a certain specified value, the pressure switch (13) is triggered and controls the hydraulic pump (4) to start working. The hydraulic pump (4) draws oil from the hydraulic oil tank (1) and flows through the first pressure sensor (5), the first flow sensor (6), the check valve (7), and the pressure oil filter (11) to pressurize the accumulator (12). When the hydraulic pressure of the accumulator (12) rises to a certain specified value, the pressure switch (13) is triggered and controls the hydraulic pump (4) to stop working. The safety valve (9) is used to prevent the system from overpressure and plays a protective role.

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