Relay valve fault diagnosis and positioning method and device

Abstract

The present invention provides a relay valve fault diagnosis and location method and device. This relay valve fault diagnosis and location method is used to determine the fault status and location of a relay valve having multiple chambers. The method comprises the following steps: collecting actual internal pressure data for each chamber and actual external pressure data corresponding to each chamber; comparing the collected actual internal pressure data and actual external pressure data with pre-acquired fault data; and determining the relay valve fault status and location. This invention solves the technical problems of relay valve fault diagnosis and location, which are difficult, inaccurate, and labor-intensive.

Description

Technical Field

[0001] The present invention relates to the field of vehicle braking technology, and further to a relay valve fault diagnosis and positioning method and device, and in particular to a relay valve fault diagnosis and positioning method and device capable of multi-level pressure output. Background Art

[0002] The relay valve in the rail vehicle braking system outputs the corresponding brake cylinder pressure according to the pre-control pressure and amplifies the flow, thereby achieving the purpose of rapid action of the brake system actuator.

[0003] Simple relay valves maintain a fixed ratio between output pressure and input pressure (typically 1:1, meaning the output pressure matches the pre-controlled pressure). More complex multi-stage pressure output relay valves incorporate additional chambers and piston diaphragms within the relay valve. By controlling the flow of air into each chamber, the ratio of output pressure to input pressure can be varied. This ratio increases with the number of chambers and piston diaphragms. Due to this more complex internal structure, locating a fault in a multi-stage pressure output relay valve can be more difficult.

[0004] Existing relay valve fault diagnosis methods generally detect the external pressure of the relay valve (such as total air pressure, pre-control pressure, output pressure, etc.), compare it with the fault model, or determine its deviation from the normal state pressure for fault diagnosis.

[0005] For example: Publication No.: CN108874741A, Publication Date: 2018.11.23, Name: A Chinese patent for a relay valve leakage fault detection method based on an SPRT algorithm, which discloses that according to the input and output characteristics of the relay valve, the SPRT algorithm is used to detect leakage based on the difference in the output pressure change amplitude between the normal and leaking conditions of the relay valve, thereby achieving the effect of relay valve leakage fault detection and early warning. However, the disadvantage of this method is that it can only judge leakage through the output pressure data. Therefore, it can diagnose or predict leakage faults, but cannot locate the faulty parts inside the valve; another example: Publication No.: CN111308909A, Publication Date: 2 June 19, 2020, Title: A Chinese patent for a relay valve fault diagnosis method and device. This patent discloses obtaining pressure time series of the main air cylinder, equalizing air cylinder, and train pipe from a real train equalizing module and a train equalizing module simulation platform when the relay valve has different fault types. Pressure characteristic values ​​are extracted from these pressure series to construct training data, train a neural network model, and obtain a relay valve fault diagnosis model. This model is used to diagnose the fault type of the relay valve under test. Similarly, this method only collects data on the main air cylinder, equalizing air cylinder, and train pipe pressures outside the relay valve. By analyzing this data, a diagnostic model is obtained, which can be used to diagnose the fault type, but it still cannot locate the faulty component inside the valve. Therefore, both of the above methods can only diagnose relay valve faults, but cannot accurately locate the faulty component inside the valve.

[0006] Currently, the fault diagnosis and location method for multi-stage pressure output relay valves is to test on a test bench, collect the pressure of each external gas line, analyze the pressure data based on the valve principle, and preliminarily determine the approximate range of the faulty component. The valve is then disassembled, and the suspected faulty components are replaced one by one, locating the faulty component through elimination. This method has the following disadvantages:

[0007] 1. Disassembling the valve will cause the state of the faulty parts to change (for example, if some seals leak, the position and shape of the seals will change after disassembly), causing the valve to return to normal and the fault to be impossible to reproduce.

[0008] Second, it consumes a lot of manpower. For a multi-stage pressure output relay valve with a complex structure, there are many internal parts that may cause the same failure phenomenon. Replacing and assembling them one by one for testing will consume a lot of time and manpower.

[0009] 3. Currently, automated fault detection is not possible. Identifying faulty parts by replacing parts requires manual intervention, and fault determination also requires manual analysis based on the principles. Automated fault diagnosis and location are not possible, and the efficiency is extremely low.

[0010] Currently, no effective solution has been provided for the problems in related technologies of difficulty, low accuracy, and high labor intensity in fault diagnosis and positioning of relay valves.

[0011] Therefore, the inventors, relying on their many years of experience and practice in related industries, have proposed a relay valve fault diagnosis and positioning method and device to overcome the defects of the prior art. Summary of the Invention

[0012] The purpose of the present invention is to provide a relay valve fault diagnosis and positioning method and device, which can diagnose faults of multi-stage pressure output relay valves and accurately locate the fault position inside the valve body. The diagnosis accuracy is high, and there is no need to disassemble the valve body, thereby improving efficiency, saving time and manpower.

[0013] The purpose of the present invention can be achieved by adopting the following scheme:

[0014] The present invention provides a relay valve fault diagnosis and positioning method for determining the fault state and fault location of a relay valve having multiple chambers. The relay valve fault diagnosis and positioning method comprises the following steps:

[0015] respectively collecting actual internal pressure data of each of the chambers and actual external pressure data corresponding to each of the chambers;

[0016] comparing the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data;

[0017] Determine the fault status and fault location of the relay valve.

[0018] In a preferred embodiment of the present invention, the actual internal pressure data of the chamber is the internal pressure of the chamber or the output pressure of the chamber under actual working conditions.

[0019] In a preferred embodiment of the present invention, a pressure collection hole is reserved on each of the chambers or at the exhaust port of each of the chambers, and the actual internal pressure data of the corresponding chamber is collected through the pressure collection hole.

[0020] In a preferred embodiment of the present invention, the actual external pressure data of the chamber is the input pressure of the chamber under actual working conditions.

[0021] In a preferred embodiment of the present invention, the air inlet of each chamber is connected to the corresponding external air circuit, and the pressure in the corresponding external air circuit or the pressure at the air inlet of the chamber is collected as the actual external pressure data of the corresponding chamber.

[0022] In a preferred embodiment of the present invention, before respectively collecting the actual internal pressure data of each chamber and the actual external pressure data corresponding to each chamber, the method further includes:

[0023] Simulating states where failures occur at different locations in the relay valve;

[0024] respectively collecting simulated internal pressure data and simulated external pressure data of each chamber when a fault occurs at different locations;

[0025] A fault model of the relay valve is established based on the collected simulated internal pressure data and simulated external pressure data.

[0026] In a preferred embodiment of the present invention, the comparing the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data includes:

[0027] comparing the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model;

[0028] Selecting, from the fault model, the simulated internal pressure data and the simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data as the fault data;

[0029] According to the fault data, the fault state corresponding to the relay valve and the fault location in the fault model are determined.

[0030] In a preferred embodiment of the present invention, the fault state and the fault location corresponding to the relay valve in the fault model are the fault state and the fault location of the relay valve under actual working conditions.

[0031] The present invention provides a relay valve fault diagnosis and positioning device for determining the fault state and fault location of a relay valve having multiple chambers. The relay valve fault diagnosis and positioning device includes:

[0032] a data acquisition unit, configured to respectively acquire actual internal pressure data of each of the chambers and actual external pressure data corresponding to each of the chambers;

[0033] a data processing unit, configured to compare the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data;

[0034] The fault determination unit is used to determine the fault state and fault location of the relay valve.

[0035] In a preferred embodiment of the present invention, the relay valve fault diagnosis and positioning device further includes:

[0036] a fault state simulation unit, used to simulate the state of faults occurring at different positions in the relay valve;

[0037] a simulation data acquisition unit, for respectively acquiring simulated internal pressure data and simulated external pressure data of each of the chambers when a fault occurs at different locations;

[0038] The fault model establishing unit is used to establish a fault model of the relay valve according to the collected simulated internal pressure data and simulated external pressure data.

[0039] In a preferred embodiment of the present invention, the data processing unit includes:

[0040] a data comparison module, configured to compare the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model;

[0041] a fault data determination module, configured to select, from the fault model, the simulated internal pressure data and the simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data, as the fault data;

[0042] The fault determination module is used to determine the fault state corresponding to the relay valve and the fault location in the fault model according to the fault data.

[0043] In a preferred embodiment of the present invention, the data acquisition unit includes a pressure sensor, a pressure collection hole is reserved on each of the chambers or at the exhaust port of each of the chambers, and the pressure sensor is arranged at the pressure collection hole.

[0044] In a preferred embodiment of the present invention, the relay valve fault diagnosis and positioning device also includes a test device, which is provided with an air circuit interface that can supply air to the outside. The air circuit interface is connected to one end of the external air circuit, and the other end of the external air circuit is respectively connected to the air inlet of each of the chambers. The air supply pressure into each of the chambers is controlled and collected by the test equipment to simulate the working condition of the relay valve when it is in a fault.

[0045] In a preferred embodiment of the present invention, the relay valve fault diagnosis and positioning device also includes a data analysis device, which includes at least a data processing unit and a fault determination unit. The data analysis device is used to analyze the collected actual internal pressure data and the actual external pressure data according to the fault model to determine the fault state of the relay valve and the location of the fault.

[0046] As described above, the characteristics and advantages of the relay valve fault diagnosis and positioning method and device of the present invention are: the actual internal pressure data of each chamber in the relay valve and the actual external pressure data corresponding to each chamber can be collected separately, and the collected actual internal pressure data and actual external pressure data are compared with the pre-acquired fault data, and the fault state of the relay valve and the location of the fault are determined according to the comparison results. The present invention can perform fault diagnosis on the multi-stage pressure output relay valve through the above method, and accurately locate the location of the fault inside the multi-stage pressure output relay valve, thereby improving the accuracy of fault judgment without disassembling the multi-stage pressure output relay valve, effectively improving the efficiency of fault detection, saving time and reducing manpower consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0048] in:

[0049] Figure 1 : This is one of the flow charts of the relay valve fault diagnosis and positioning method of the present invention.

[0050] Figure 2 : This is the second flow chart of the relay valve fault diagnosis and positioning method of the present invention.

[0051] Figure 3 : This is the third flow chart of the relay valve fault diagnosis and positioning method of the present invention.

[0052] Figure 4 : This is one of the structural block diagrams of the relay valve fault diagnosis and positioning device of the present invention.

[0053] Figure 5 : This is the second structural block diagram of the relay valve fault diagnosis and positioning device of the present invention.

[0054] Figure 6 : This is the third structural block diagram of the relay valve fault diagnosis and positioning device of the present invention.

[0055] Figure 7 : This is the fourth structural block diagram of the relay valve fault diagnosis and positioning device of the present invention.

[0056] Figure 8 : is a structural diagram of a relay valve in one embodiment of the present invention.

[0057] Figure 9 : It is a structural schematic diagram of a relay valve provided with a pressure collection hole in one embodiment of the present invention.

[0058] The accompanying drawings in the present invention are:

[0059] 100. Data acquisition unit; 200. Data processing unit;

[0060] 2001. Data comparison module; 2002. Fault data determination module;

[0061] 2003, fault determination module; 300, fault determination unit;

[0062] 400, fault state simulation unit; 500, simulation data acquisition unit;

[0063] 600. Fault model building unit; 700. Data analysis equipment;

[0064] 800. Test equipment;

[0065] 1. Relay valve; 2. First diaphragm piston;

[0066] 3. Second diaphragm piston; 4. First return spring;

[0067] 5. Second return spring; 6. First elastic seal;

[0068] 7. Second elastic sealing member; 8. First plate surface;

[0069] 9. Second board surface; 10. Third board surface;

[0070] 11. Fourth board; 12. Fifth board;

[0071] 13. Sixth plate surface; 14. Valve seat;

[0072] 15. Valve core; 16. Third return spring;

[0073] 17. Shrinkage and blockage; 18. Intake valve port;

[0074] 19. Air outlet valve; 20. First proportional switching control valve;

[0075] 21. Second proportional switching control valve; 22. Third proportional switching control valve;

[0076] 23. Regulating piston; 24. Pressure regulating channel;

[0077] 25. Fourth return spring; 26. First pressure regulating chamber;

[0078] 27. Second pressure regulating chamber; 28. First valve stem;

[0079] 29. Second valve stem; 30. First pressure collection hole;

[0080] 31. Second pressure collection hole; 32. Third pressure collection hole;

[0081] 33. Fourth pressure collection hole; 34. Fifth pressure collection hole;

[0082] 35. Sixth pressure collection hole; 36. Seventh pressure collection hole;

[0083] 37. Eighth pressure collection hole; 38. Ninth pressure collection hole;

[0084] C1, output cavity; C2, feedback cavity;

[0085] Cv1, first pressure chamber; Cv2, second pressure chamber;

[0086] Cv3, third pressure chamber; Cv4, fourth pressure chamber;

[0087] Cv5, fifth pressure chamber; Cv6, sixth pressure chamber;

[0088] Cv7, seventh pressure chamber; R, total wind pressure chamber;

[0089] R0, total air inlet channel; C0, output channel;

[0090] Cv0, pre-control pressure channel; T1, first pressure control channel;

[0091] T2, the second pressure control channel; T3, the third pressure control channel. DETAILED DESCRIPTION

[0092] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0093] Implementation Method 1

[0094] like Figure 1 As shown, the present invention provides a relay valve fault diagnosis and positioning method for determining the fault state and fault location of a relay valve 1 having multiple chambers (multi-stage pressure output relay valve). The relay valve fault diagnosis and positioning method includes the following steps:

[0095] Step S1: respectively collecting actual internal pressure data of each chamber in the relay valve 1 and actual external pressure data corresponding to each chamber;

[0096] Furthermore, in step S1 , the actual internal pressure data of the chamber is: the internal pressure of the chamber or the output pressure of the chamber under actual working conditions.

[0097] Specifically, a corresponding pressure collection hole can be reserved on each chamber or at the exhaust port of each chamber, and a pressure collection element such as but not limited to a pressure sensor can be set at the pressure collection hole to collect the actual internal pressure data of the corresponding chamber through the pressure collection hole.

[0098] Furthermore, in step S1 , the actual external pressure data of the chamber is: the input pressure of the chamber under actual working conditions.

[0099] Specifically, the air inlet of each chamber can be connected to the corresponding external air circuit, and the pressure in the corresponding external air circuit or the pressure at the air inlet of the chamber can be collected. The collected pressure in the external air circuit or the pressure at the air inlet of the chamber is the actual external pressure data of the corresponding chamber.

[0100] In various fault conditions of the multi-stage pressure output relay valve, collecting actual external pressure data can only determine whether the multi-stage pressure output relay valve has failed, but cannot locate the location of the fault. Therefore, it is also necessary to collect the actual internal pressure data of each chamber and determine the location of the chamber where the fault is located based on the actual internal pressure data.

[0101] In an optional embodiment of the present invention, Figure 2 As shown, before step S1, a fault model of the relay valve 1 needs to be established, and the specific steps include:

[0102] Step S01: simulating the state of failure at different positions of the relay valve 1;

[0103] Before actual use, each possible fault condition (including component failure and chamber failure) in the multi-stage pressure output relay valve is simulated one by one.

[0104] Step S02: collecting simulated internal pressure data and simulated external pressure data of each chamber when a fault occurs at different locations;

[0105] Under each fault condition, simulated internal and external pressure data of each chamber are collected. The simulated internal and external pressure data can be the instantaneous value of the pressure at a certain point in time or the pressure change trend in each time period.

[0106] Step S03: establishing a fault model of the relay valve 1 according to the collected simulated internal pressure data and simulated external pressure data.

[0107] Specifically, the simulated internal pressure data and the simulated external pressure data of each chamber under various simulated fault conditions are summarized and recorded, thereby establishing a fault model of the relay valve 1 .

[0108] Step S2: comparing the collected actual internal pressure data and actual external pressure data with the pre-acquired fault data;

[0109] Further, such as Figure 3 As shown, step S2 includes:

[0110] Step S201: comparing the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model;

[0111] Step S202: Selecting simulated internal pressure data and simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data from the fault model as fault data;

[0112] Step S203: Determine the fault state and fault location corresponding to the relay valve 1 in the fault model according to the fault data.

[0113] Step S3: Determine the fault state and fault location of the relay valve 1.

[0114] Specifically, the fault state and fault location corresponding to the relay valve 1 in the fault model are: the fault state and fault location of the relay valve 1 under actual working conditions.

[0115] The characteristics and advantages of the relay valve fault diagnosis and positioning method of the present invention are:

[0116] 1. This relay valve fault diagnosis and positioning method collects the actual internal pressure data of each chamber in the relay valve 1 and the actual external pressure data corresponding to each chamber, and compares the collected actual internal pressure data and actual external pressure data with the pre-acquired fault data, thereby determining the fault state and fault location of the relay valve 1. There is no need to disassemble the multi-stage pressure output relay valve 1, which effectively improves the fault detection efficiency, saves time, and reduces manpower consumption.

[0117] 2. The relay valve fault diagnosis and positioning method locates the fault state and the fault location by combining the actual internal pressure data of the chamber and the actual external pressure data corresponding to each chamber. For a multi-stage pressure output relay valve 1 with a complex internal structure, the fault location can be accurately located.

[0118] 3. The relay valve fault diagnosis and positioning method can automatically perform fault diagnosis and positioning, realize automated fault diagnosis and positioning, and achieve standardized and automated operations without human intervention.

[0119] Implementation Method 2

[0120] like Figure 4 As shown, the present invention provides a relay valve fault diagnosis and positioning device for determining the fault state and fault location of a relay valve 1 having multiple chambers. The relay valve fault diagnosis and positioning device includes a data acquisition unit 100, a data processing unit 200 and a fault determination unit 300, wherein:

[0121] The data acquisition unit 100 is used to respectively acquire actual internal pressure data of each chamber and actual external pressure data corresponding to each chamber;

[0122] Furthermore, the actual internal pressure data of the chamber is: the internal pressure of the chamber or the output pressure of the chamber under actual working conditions.

[0123] Furthermore, the actual external pressure data of the chamber is: the input pressure of the chamber under actual working conditions.

[0124] The data processing unit 200 is used to compare the collected actual internal pressure data and actual external pressure data with the pre-acquired fault data;

[0125] The fault determination unit 300 is used to determine the fault state and fault location of the relay valve 1 .

[0126] In an optional embodiment of the present invention, Figure 5 As shown, the relay valve fault diagnosis and positioning device further includes a fault state simulation unit 400, a simulation data acquisition unit 500 and a fault model establishment unit 600, wherein:

[0127] The fault state simulation unit 400 is used to simulate the state of faults occurring at different positions in the relay valve 1;

[0128] Before actual use, each possible fault condition (including component failure and chamber failure) in the multi-stage pressure output relay valve is simulated one by one.

[0129] The simulation data acquisition unit 500 is used to respectively collect the simulated internal pressure data and simulated external pressure data of each chamber when a fault occurs at different locations;

[0130] Under each fault condition, simulated internal and external pressure data of each chamber are collected. The simulated internal and external pressure data can be the instantaneous value of the pressure at a certain point in time or the pressure change trend in each time period.

[0131] The fault model establishing unit 600 is used to establish a fault model of the relay valve 1 according to the collected simulated internal pressure data and simulated external pressure data.

[0132] Specifically, the simulated internal pressure data and the simulated external pressure data of each chamber under various simulated fault conditions are summarized and recorded, thereby establishing a fault model of the relay valve 1 .

[0133] In an optional embodiment of the present invention, Figure 6As shown, the data processing unit 200 includes a data comparison module 2001, a fault data determination module 2002 and a fault determination module 2003, wherein:

[0134] The data comparison module 2001 is used to compare the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model;

[0135] The fault data determination module 2002 is configured to select, from the fault model, simulated internal pressure data and simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data, as the fault data;

[0136] The fault determination module 2003 is used to determine the fault state and fault location corresponding to the relay valve 1 in the fault model according to the fault data.

[0137] In an optional embodiment of the present invention, Figure 7 As shown, the data acquisition unit 100 includes a pressure sensor. A pressure acquisition hole is reserved on each chamber or at the exhaust port of each chamber, and the pressure sensor is arranged at the pressure acquisition hole. Of course, other pressure detection elements can also be used to collect the pressure in each chamber or at the exhaust port of each chamber.

[0138] Further, such as Figure 7 As shown, the relay valve fault diagnosis and positioning device also includes a test device 800, which is provided with an air circuit interface that can supply air to the outside. The air circuit interface is connected to the air source, and the air circuit interface is also connected to one end of the external air circuit. The other end of the external air circuit is respectively connected to the air inlet of each chamber. The air supply pressure into each chamber is controlled and collected by the test device 800 to simulate the working condition of the relay valve when it is in a fault.

[0139] Further, such as Figure 7 As shown, the relay valve fault diagnosis and positioning device also includes a data analysis device 700, which includes at least a data processing unit 200 and a fault determination unit 300. The data analysis device 700 is used to analyze the collected actual internal pressure data and actual external pressure data according to the fault model to determine the fault state of the relay valve 1 and the location of the fault.

[0140] The following is an example of a relay valve 1 (a multi-stage pressure output relay valve) to illustrate the fault judgment process of the relay valve 1.

[0141] like Figure 8Figure 2 shows the specific structure of the relay valve 1 (multi-stage pressure output relay valve) in this embodiment. The relay valve 1 includes a valve core 15, a first diaphragm piston 2, and a second diaphragm piston 3. The positions of the first diaphragm piston 2 and the second diaphragm piston 3 within the relay valve 1 can be adjusted by controlling the air pressure within the relay valve 1. Among them, the valve core 15, the first diaphragm piston 2 and the second diaphragm piston 3 are all movably arranged in the relay valve 1, and the valve core 15, the first diaphragm piston 2 and the second diaphragm piston 3 are respectively adapted to the space set in the relay valve 1, the first diaphragm piston 2 has a first plate surface 8, a second plate surface 9, a third plate surface 10 and a fourth plate surface 11, the second diaphragm piston 3 has a fifth plate surface 12 and a sixth plate surface 13, a feedback chamber C2 for inputting pre-control pressure is formed between the first plate surface 8 and the inner wall of the relay valve 1, a first pressure chamber Cv1 for inputting pre-control pressure is formed between the second plate surface 9 and the inner wall of the relay valve 1, a second pressure chamber Cv2 for inputting pre-control pressure is formed between the third plate surface 10 and the inner wall of the relay valve 1, a third pressure chamber Cv3 for inputting pre-control pressure is formed between the fourth plate surface 11 and the inner wall of the relay valve 1, and a feedback chamber C2 for inputting pre-control pressure is formed between the fifth plate surface 12 and the inner wall of the relay valve 1 The fourth pressure chamber Cv4 of the pre-control pressure, the fifth pressure chamber Cv5 for inputting the pre-control pressure is formed between the sixth plate surface 13 and the inner wall of the relay valve 1, the first pressure chamber Cv1 is connected to the second pressure chamber Cv2, and the other pressure chambers are separated; one end of the first diaphragm piston 2 is in contact with the valve core 15, and the other end of the first diaphragm piston 2 can be in contact with one end of the second diaphragm piston 3, so that the second diaphragm piston 3 can be pushed to move during the movement of the first diaphragm piston 2 (since there is no fixed connection between the first diaphragm piston 2 and the second diaphragm piston 3, the first diaphragm piston 2 cannot pull the second diaphragm piston 3 to move), and a total wind pressure chamber R and an output chamber C1 that can control the on and off are formed between the valve core 15 and the inner wall of the relay valve 1, the output chamber C1 and the feedback chamber C2 can be connected on and off, and the output chamber C1 is also connected to the brake cylinder, and the total wind pressure chamber R is connected to the total wind pressure source of the vehicle. During use, by adjusting the pre-control pressure input into each chamber (i.e., the feedback chamber C2, the first pressure chamber Cv1, the second pressure chamber Cv2, the third pressure chamber Cv3, the fourth pressure chamber Cv4 and the fifth pressure chamber Cv5), the force applied to each diaphragm piston can be changed respectively, thereby being able to output six different proportions of brake cylinder pressures to the brake cylinder.

[0142] In this embodiment, if Figure 8As shown, the relay valve 1 also includes a coaxially arranged first valve stem 28 and second valve stem 29. A first diaphragm piston 2 is mounted on the first valve stem 28, and a second diaphragm piston 3 is mounted on the second valve stem 29. One end of the first valve stem 28 forms a valve seat 14 that abuts the valve core 15, while the other end of the first valve stem 28 abuts one end of the second valve stem 29. Seal rings are provided on the first valve stem 28 near the output chamber C1, and on the second valve stem 29 near the third pressure chamber Cv3. Movement of the second valve stem 29 drives the first valve stem 28, thereby driving the valve core 15. Alternatively, the second valve stem 29 can remain stationary, with movement of the first valve stem 28 alone driving the valve core 15. Both of these approaches can control the movement of the valve core 15, thereby achieving total air input and output of brake pressure to the brake cylinder.

[0143] In this embodiment, if Figure 8 As shown, a first return spring 4 is sleeved around the first valve stem 28 located within the second pressure chamber Cv2. One end of the first return spring 4 abuts the third plate surface 10, while the other end abuts the inner wall of the relay valve 1. When no pre-control pressure is input into the relay valve 1, the first return spring 4 pushes the first diaphragm piston 2 back to its original position (i.e., to its preset position), thereby ensuring pressure balance within the relay valve 1.

[0144] In this embodiment, if Figure 8 As shown, a second return spring 5 is sleeved around the second valve stem 29 located in the fourth pressure chamber Cv4. One end of the second return spring 5 abuts the fifth plate surface 12, and the other end of the second return spring 5 abuts the inner wall of the relay valve 1. When no pre-control pressure is input into the relay valve 1, the second return spring 5 can push the second diaphragm piston 3 to reset (i.e., return to the preset position) to ensure pressure balance within the relay valve 1.

[0145] In this embodiment, if Figure 8As shown, an inlet valve port 18 is formed between the valve core 15 and the inner wall of the relay valve 1. Moving the valve core 15 allows the output chamber C1 to communicate with the total air pressure chamber R. Pushing the valve core 15 within the relay valve 1 controls the opening and closing of the inlet valve port 18, thereby allowing compressed air to be input. An outlet valve port 19 is formed between the valve core 15 and the first valve stem 28. Moving the valve core 15 allows the output chamber C1 to communicate with the outside. Pushing the valve core 15 within the relay valve 1 controls the opening and closing of the outlet valve port 19, thereby allowing exhaust to the outside. When the valve seat 14 abuts against the valve core 15 and pushes the valve core 15 to move, the air outlet valve port 19 is closed and the air inlet valve port 18 is opened. At this time, the output chamber C1 is isolated from the outside atmosphere, and the total air pressure chamber R is connected to the output chamber C1; when the pressure is stable, the valve seat 14 and the valve core 15 maintain contact. At this time, the air outlet valve port 19 and the air inlet valve port 18 are both closed, the total air pressure chamber R is isolated from the output chamber C1, and the output chamber C1 is isolated from the outside atmosphere; when the valve seat 14 and the valve core 15 are separated, the air outlet valve port 19 is opened and the air inlet valve port 18 is closed. At this time, the total air pressure chamber R is isolated from the output chamber C1, and the output chamber C1 is connected to the outside atmosphere.

[0146] In this embodiment, if Figure 8 As shown, in order to ensure the separation effect between the pressure chambers and ensure that the first diaphragm piston 2 and the second diaphragm piston 3 can obtain the desired moving position and motion state under the action of the pre-control pressure, a plurality of first elastic seals 6 are respectively arranged between the feedback chamber C2 and the first pressure chamber Cv1 and between the second pressure chamber Cv2 and the third pressure chamber Cv3 for separation, one end of each first elastic seal 6 is respectively embedded in the interior of the first diaphragm piston 2, and the other end of each first elastic seal 6 is respectively embedded in the interior of the relay valve 1; and a plurality of second elastic seals 7 are respectively arranged between the fourth pressure chamber Cv4 and the fifth pressure chamber Cv5 for separation, one end of each second elastic seal 7 is respectively embedded in the interior of the second diaphragm piston 3, and the other end of each second elastic seal 7 is respectively embedded in the interior of the relay valve 1.

[0147] In this embodiment, if Figure 8 As shown, a third return spring 16 is sleeved around the valve core 15. One end of the third return spring 16 abuts against an annular boss formed on the valve core 15, while the other end abuts against the inner wall of the relay valve 1. In the absence of pre-control pressure Pcv, the third return spring 16 pushes the valve core 15 back to its original position. At this point, the inlet valve port 18 is closed, and the total pressure air in the total air pressure chamber R does not enter the output chamber C1.

[0148] In this embodiment, if Figure 8 As shown, the relay valve 1 is provided with a total air inlet channel R0 and an output channel C0. The total air inlet channel R0 is communicated with the total air pressure chamber R, and the output channel C0 is communicated with the output chamber C1.

[0149] In this embodiment, if Figure 8 As shown, a feedback channel is provided between the output chamber C1 and the feedback chamber C2. Its two ends communicate with the output channel C0 and the feedback chamber C2, respectively. The air pressure output to the brake cylinder enters the feedback chamber C2 through the feedback channel, serving as feedback pressure to establish the final pressure balance within the relay valve 1. A plug 17 is provided in the feedback channel. By adjusting the aperture of plug 17, the flow rate of compressed air from the output chamber C1 into the feedback chamber C2 can be controlled.

[0150] In this embodiment, if Figure 8 As shown, the relay valve capable of multi-stage pressure output also includes a first proportional switching control valve 20, a second proportional switching control valve 21, and a third proportional switching control valve 22 for controlling pre-control pressure. Relay valve 1 is provided with a pre-control pressure channel Cv0, a first pressure control channel T1, a second pressure control channel T2, and a third pressure control channel T3. Pre-control pressure channel Cv0 communicates with the second pressure chamber Cv2, and with the third pressure chamber Cv3 via the first proportional switching control valve 20. Pre-control pressure channel Cv0 communicates with the fourth pressure chamber Cv4 via the second proportional switching control valve 21, and with the fifth pressure chamber Cv5 via the third proportional switching control valve 22. Under the control of the corresponding control pressure, each proportional switching control valve can input pre-control pressure into each pressure chamber through its corresponding pre-control pressure channel, thereby regulating the output pressure of the brake cylinder.

[0151] In this embodiment, if Figure 8As shown, the third proportional switching control valve 22 includes a regulating piston 23 movably arranged in the third proportional switching control valve 22, and a first pressure regulating chamber 26 and a second pressure regulating chamber 27 are respectively formed between the two ends of the regulating piston 23 in the third proportional switching control valve 22 and the inner wall of the third proportional switching control valve 22. A fourth return spring 25 is provided in the second pressure regulating chamber 27 of the third proportional switching control valve 22, and one end of the fourth return spring 25 abuts against the regulating piston 23 in the third proportional switching control valve 22, and the other end of the fourth return spring 25 abuts against the inner wall of the third proportional switching control valve 22. The first pressure regulating chamber 26 of the third proportional switching control valve 22 is connected to the third pressure control channel T3, and a pressure regulating channel 27 is provided on the regulating piston 23 of the third proportional switching control valve 22. 4. Move the regulating piston 23 in the third proportional switching control valve 22 upward and compress the fourth return spring 25, so as to control the pressure regulating channel 24 of the third proportional switching control valve 22 to be connected to the external atmosphere. At this time, the pressure regulating channel 24 in the third proportional switching control valve 22 is connected to the fifth pressure chamber Cv5, and the pressure in the fifth pressure chamber Cv5 is exhausted; move the regulating piston 23 in the third proportional switching control valve 22 downward and restore the fourth return spring 25 to its original position under the action of its own elastic force, and the pre-control pressure channel Cv0 is connected to the fifth pressure chamber Cv5 through the pressure regulating channel 24 in the third proportional switching control valve 22. The pre-control pressure channel Cv0 fills the fifth pressure chamber Cv5 with the pre-control pressure Pcv, and the pre-control pressure Pcv is input into the fifth pressure chamber Cv5 and acts on the sixth plate surface 13.

[0152] In this embodiment, if Figure 8As shown, the first proportional switching control valve 20 and the third proportional switching control valve 22 have the same structure. That is, the first proportional switching control valve 20 includes a regulating piston 23 movably disposed in the first proportional switching control valve 20. A first pressure regulating chamber 26 and a second pressure regulating chamber 27 are formed between the two ends of the regulating piston 23 in the first proportional switching control valve 20 and the inner wall of the first proportional switching control valve 20, respectively. A fourth return spring 25 is disposed in the second pressure regulating chamber 27 of the first proportional switching control valve 20. One end of the fourth return spring 25 abuts against the regulating piston 23 in the first proportional switching control valve 20, and the other end of the fourth return spring 25 abuts against the inner wall of the first proportional switching control valve 20. The first pressure regulating chamber 26 of the first proportional switching control valve 20 is connected to the first pressure control channel T1, and a pressure regulating channel 24 is disposed on the regulating piston 23 of the first proportional switching control valve 20. , move the regulating piston 23 in the first proportional switching control valve 20 upward and compress the fourth return spring 25, which can control the pressure regulating channel 24 of the first proportional switching control valve 20 to be connected to the external atmosphere. At this time, the pressure regulating channel 24 in the first proportional switching control valve 20 is connected to the third pressure chamber Cv3, and the pressure in the third pressure chamber Cv3 is discharged; move the regulating piston 23 in the first proportional switching control valve 20 downward and restore the fourth return spring 25 to its original position under the action of its own elastic force, the pre-control pressure channel Cv0 is connected to the third pressure chamber Cv3 through the pressure regulating channel 24 in the first proportional switching control valve 20, and the pre-control pressure channel Cv0 fills the third pressure chamber Cv3 with the pre-control pressure Pcv, and the pre-control pressure Pcv is input into the third pressure chamber Cv3 and acts on the fourth plate surface 11.

[0153] In this embodiment, if Figure 8As shown, the second proportional switching control valve 21 and the third proportional switching control valve 22 have different structures. The second proportional switching control valve 21 includes a regulating piston 23 movably arranged in the second proportional switching control valve 21. A first pressure regulating chamber 26 and a second pressure regulating chamber 27 are respectively formed between the two ends of the regulating piston 23 in the second proportional switching control valve 21 and the inner wall of the second proportional switching control valve 21. A fourth return spring 25 is provided in the second pressure regulating chamber 27 of the second proportional switching control valve 21. One end of the fourth return spring 25 abuts against the regulating piston 23 in the second proportional switching control valve 21, and the other end of the fourth return spring 25 abuts against the inner wall of the second proportional switching control valve 21. The first pressure regulating chamber 26 of the second proportional switching control valve 21 is connected to the second pressure control channel T2. A pressure regulating channel 24 is provided on the regulating piston 23. By moving the regulating piston 23 in the second proportional switching control valve 21 upward and compressing the fourth return spring 25, the pre-control pressure channel Cv0 can be controlled to be connected with the fourth pressure chamber Cv4 through the pressure regulating channel 24 in the second proportional switching control valve 21. The pre-control pressure channel Cv0 fills the fourth pressure chamber Cv4 with the pre-control pressure Pcv, and the pre-control pressure Pcv is input into the fourth pressure chamber Cv4 and acts on the fifth plate surface 12; by moving the regulating piston 23 in the second proportional switching control valve 21 downward and restoring the fourth return spring 25 to its original position under the action of its own elastic force, the pressure regulating channel 24 of the second proportional switching control valve 21 can be controlled to be connected with the external atmosphere. At this time, the pressure regulating channel 24 in the second proportional switching control valve 21 is connected with the fourth pressure chamber Cv4, and the pressure in the fourth pressure chamber Cv4 is discharged.

[0154] During the operation of the relay valve 1 of this embodiment, the function of each proportional switching control valve (i.e., the first proportional switching control valve 20, the second proportional switching control valve 21 and the third proportional switching control valve 22) is to control the inflation or exhaust of the third pressure chamber Cv3, the fourth pressure chamber Cv4 and the fifth pressure chamber Cv5 in the relay valve 1 by controlling the pressure (PT1, PT2, PT3) according to the control signal given by the braking system, so as to achieve the effect of changing the output ratio. The working principle of the first proportional switching control valve 20 is as follows: when the braking system gives a control pressure signal, the regulating piston 23 of the first proportional switching control valve 20 overcomes the elastic force of the fourth return spring 25 of the first proportional switching control valve 20 and moves upward under the action of the control pressure PT1. After reaching the working position, the third pressure chamber Cv3 is connected to the external atmosphere, and the third pressure chamber Cv3 is emptied at this time; when the pressure signal disappears, the regulating piston 23 of the first proportional switching control valve 20 moves downward to the initial position under the action of the fourth return spring 25, and the pre-control pressure channel Cv is connected to the third pressure chamber Cv3, and the pre-control pressure enters the third pressure chamber Cv3. At this time, the fourth plate surface 11 of the first diaphragm piston 2 is subjected to force and participates in pressure balance. The working principle of the second proportional switching control valve 21 is as follows: when the braking system gives a control pressure signal, the regulating piston 23 of the second proportional switching control valve 21 overcomes the elastic force of the fourth return spring 25 of the second proportional switching control valve 21 and moves upward under the action of the control pressure PT2. After reaching the working position, the pre-control pressure channel Cv is connected with the fourth pressure chamber Cv4, and the pre-control pressure enters the fourth pressure chamber Cv4. At this time, the fifth plate surface 12 of the second diaphragm piston 3 is subjected to force and participates in pressure balance. The working principle of the third proportional switching control valve 22 is the same as that of the first proportional switching control valve 20, that is: when the braking system gives a control pressure signal, the regulating piston 23 of the third proportional switching control valve 22 overcomes the elastic force of the fourth return spring 25 of the third proportional switching control valve 22 and moves upward under the action of the control pressure PT3. After reaching the working position, the fifth pressure chamber Cv5 is connected to the external atmosphere, and the fifth pressure chamber Cv5 is emptied at this time; when the pressure signal disappears, the regulating piston 23 of the third proportional switching control valve 22 moves downward to the initial position under the action of the fourth return spring 25, and the pre-control pressure channel Cv0 is connected to the fifth pressure chamber Cv5, and the pre-control pressure enters the fifth pressure chamber Cv5. At this time, the sixth plate surface 13 of the second diaphragm piston 3 is subjected to force and participates in pressure balance.

[0155] like Figure 9As shown, a first pressure collection hole 30 is provided on the first proportional switching control valve 20, a second pressure collection hole 31 is provided on the second proportional switching control valve 21, a third pressure collection hole 32 is provided on the third proportional switching control valve 22, a fourth pressure collection hole 33 is provided on the relay valve 1 and is connected to the total air pressure chamber R, a fifth pressure collection hole 34 is provided on the relay valve 1 and is connected to the sixth pressure chamber Cv6 (the sealed chamber between the second pressure chamber Cv2 and the third pressure chamber Cv3), and a pressure collecting hole 36 is provided on the relay valve 1. A sixth pressure collection hole 35 is provided which is connected to the seventh pressure chamber Cv7 (the sealed chamber between the fourth pressure chamber Cv4 and the fifth pressure chamber Cv5), a seventh pressure collection hole 36 is provided on the relay valve 1 which is connected to the third pressure chamber Cv3, an eighth pressure collection hole 37 is provided on the relay valve 1 which is connected to the fourth pressure chamber Cv4, and a ninth pressure collection hole 38 is provided on the relay valve 1 which is connected to the fifth pressure chamber Cv5. Pressure sensors or other pressure detection elements are provided at each pressure collection hole, such as Figure 7 As shown, the collected pressure signal is transmitted to the data analysis device 700 via the data acquisition unit 100. The test equipment (such as a test bench) serves as the air supply and control equipment of the multi-stage pressure output relay valve, so that the multi-stage pressure output relay valve is in a faulty working condition (reproducing the faulty state). At the same time, the pressures at the total air inlet channel R0, the output channel C0, the pre-control pressure channel Cv0, the first pressure control channel T1, the second pressure control channel T2 and the third pressure control channel T3 connected to the external air circuit are collected, and the collected pressures of each external air circuit are transmitted to the data analysis device 700. The data analysis device 700 can compare the collected actual internal pressure data and actual external pressure data with the simulated internal pressure data and simulated external pressure data in the pre-established fault model through a preset program, thereby completing fault diagnosis and positioning.

[0156] Taking the aforementioned multi-stage pressure output relay valve structure as an example, if a leakage fault occurs in the pre-control pressure channel Cv0 under the conditions of proportional switching control pressures T1 = 0, T2 = 0, and T3 = 0, and the fault occurs while all air paths are ventilated and pressure maintained, then by collecting the actual external pressure data of the pre-control pressure channel Cv0 during installation, it can be determined that the pressure in the pre-control pressure channel Cv0 continues to decrease. The fault points causing the leakage in the pre-control pressure channel Cv0 may be the seals between the feedback chamber C2 and the first pressure chamber Cv1, the seals between the second pressure chamber Cv2 and the sixth pressure chamber Cv6, the seals between the sixth pressure chamber Cv6 and the third pressure chamber Cv3, the seals between the fourth pressure chamber Cv4 and the seventh pressure chamber Cv7, the seals between the seventh pressure chamber Cv7 and the fifth pressure chamber Cv5, and the seals between the third pressure chamber Cv3 and the fourth pressure chamber Cv4. By collecting the actual external and internal pressure data of each chamber and comparing them with the fault model, the fault location can be determined:

[0157] Possible fault location 1: If the seal between the feedback chamber C2 and the first pressure chamber Cv1 fails, the compressed air in the first pressure chamber Cv1 will enter the feedback chamber C2. From the collected data, the pressure of the pre-control pressure channel Cv0 will drop, and the pressure of the output channel C0 will increase.

[0158] Possible fault location two: If the seal between the second pressure chamber Cv2 and the sixth pressure chamber Cv6 or the seal between the sixth pressure chamber Cv6 and the third pressure chamber Cv3 fails, the compressed air in the first pressure chamber Cv1 will be discharged through the fifth pressure collection hole 34. From the collected data, the pressure of the pre-control pressure channel Cv0 decreases and the pressure of the fifth pressure collection hole 34 increases. At this time, the pressure in the third pressure chamber Cv3 can be evacuated by controlling the first proportional switching control valve 20; if the pressure of the fifth pressure collection hole 34 continues to rise at this time, it can be determined that the seal between the second pressure chamber Cv2 and the sixth pressure chamber Cv6 has failed; if the pressure of the fifth pressure collection hole 34 continues to drop to 0 at this time, it can be determined that the seal between the sixth pressure chamber Cv6 and the third pressure chamber Cv3 has failed.

[0159] Possible fault location three: If the seal between the third pressure chamber Cv3 and the fourth pressure chamber Cv4 fails, the compressed air in the third pressure chamber Cv3 will enter the fourth pressure chamber Cv4. From the collected data, the pressure at the seventh pressure collection hole 36 drops, and the pressure at the eighth pressure collection hole 37 increases.

[0160] Possible fault location four: If the seal between the seventh pressure chamber Cv7 and the fifth pressure chamber Cv5 fails, the compressed air in the fifth pressure chamber Cv5 will be discharged through the sixth pressure collection hole 35. From the collected data, the pressure of the pre-control pressure channel Cv0 drops and the pressure at the sixth pressure collection hole 35 rises.

[0161] From the above analysis, it can be seen that when a fault occurs in the above-mentioned pre-control pressure channel Cv0, only by collecting the actual external pressure data can the fault state (i.e., the pressure drop in the pre-control pressure channel Cv0) be diagnosed, and the specific location of the fault cannot be accurately located. However, through the fault diagnosis and positioning method of the present invention, the location of the fault can be accurately located.

[0162] Taking the aforementioned multi-stage pressure output relay valve structure as an example, if a fault occurs where the second proportional switching control valve 21 switches abnormally, resulting in a failure in the brake ratio switching, pressure is introduced to the second proportional switching control valve 21 through the second pressure control channel T2, but the brake ratio of the multi-stage pressure output relay valve changes abnormally. The fault location is determined by collecting the actual external and internal pressure data of each chamber and comparing them with the fault model:

[0163] One possible cause of the failure is that the piston in the second proportional switching control valve 21 is stuck, causing intermittent communication between the pre-control pressure channel Cv0 and the fourth pressure chamber Cv4, resulting in the pressure in the fourth pressure chamber Cv4 being unequal to the pressure at the pre-control pressure channel Cv0, causing an abnormal braking ratio. In this case, the pressure in the chamber connected to the second pressure collection hole 31 in the second proportional switching control valve 21 and the pressure in the fourth pressure chamber Cv4 are collected. If the pressure in the chamber connected to the second pressure collection hole 31 in the second proportional switching control valve 21 and the pressure in the fourth pressure chamber Cv4 rise from time to time, it proves that the piston in the second proportional switching control valve 21 is stuck and cannot move to its full position, causing the chamber in the second proportional switching control valve 21 connected to the second pressure collection hole 31 in the second proportional switching control valve 21 to communicate with the fourth pressure chamber Cv4 from time to time, and the pre-control pressure channel Cv0 to communicate with the fourth pressure chamber Cv4 from time to time, thereby causing intermittent communication between the pre-control pressure channel Cv0 and the fourth pressure chamber Cv4.

[0164] A second possible cause of the failure is a seal leak in the piston of the second proportional switching control valve 21. Although the pre-control pressure channel Cv0 is connected to the fourth pressure chamber Cv4, the pressure in the pre-control pressure channel Cv0 passes through the leaking point of the piston in the second proportional switching control valve 21 and leaks out of the second pressure collection hole 31 of the second proportional switching control valve 21, resulting in an abnormal pressure in the fourth pressure chamber Cv4. In this case, the pressure in the chamber connected to the second pressure collection hole 31 in the second proportional switching control valve 21 is collected. If the pressure in the chamber connected to the second pressure collection hole 31 in the second proportional switching control valve 21 increases, it indicates that the seal of the piston in the second proportional switching control valve 21 is leaking. The pressure in the pre-control pressure channel Cv0 passes through the leaking point of the piston in the second proportional switching control valve 21 and is discharged to the atmosphere through the second pressure collection hole 31 of the second proportional switching control valve 21.

[0165] Possible cause of failure: Leakage in the seal between the third and fourth pressure chambers Cv3 and Cv4, causing compressed air in the fourth pressure chamber Cv4 to enter the third pressure chamber Cv3, resulting in abnormal pressure in the third pressure chamber Cv3. This, in turn, causes abnormal pressure balance in the multi-stage pressure output relay valve, leading to abnormal braking ratio. In this case, the pressure in the third pressure chamber Cv3 is collected. If the pressure in the third pressure chamber Cv3 rises, it indicates that the seal separating the third and fourth pressure chambers Cv3 and Cv4 is leaking, causing compressed air in the fourth pressure chamber Cv4 to enter the third pressure chamber Cv3.

[0166] Possible cause of failure: The seal between the fourth pressure chamber Cv4 and the seventh pressure chamber Cv7 leaks, causing the pressure in the fourth pressure chamber Cv4 to leak into the atmosphere through the sixth pressure collection hole 35 via the leak point in the seal between the fourth and seventh pressure chambers Cv4 and Cv7. In this case, the pressure in the seventh pressure chamber Cv7 is collected. If the pressure in the seventh pressure chamber Cv7 rises, it indicates that the seal between the fourth and seventh pressure chambers Cv4 and Cv7 has leaked. The pressure in the fourth pressure chamber Cv4 leaks into the atmosphere through the leak point in the seal between the fourth and seventh pressure chambers Cv4 and Cv7 via the sixth pressure collection hole 35.

[0167] From the above analysis, it can be seen that for the fault of the second proportional switching control valve 21 switching abnormality resulting in the failure of the brake proportion switching, only by collecting the actual external pressure data can only complete the diagnosis of the fault state (i.e.: the second proportional switching control valve 21 switching abnormality) and cannot accurately locate the specific location of the fault. However, through the fault diagnosis and positioning method of the present invention, the location of the fault can be accurately located.

[0168] The characteristics and advantages of the relay valve fault diagnosis and positioning device of the present invention are:

[0169] The relay valve fault diagnosis and positioning device can respectively collect the actual internal pressure data of each chamber in the relay valve 1 and the actual external pressure data corresponding to each chamber, compare the collected actual internal pressure data and actual external pressure data with the pre-acquired fault data, and determine the fault state and fault location of the relay valve 1 according to the comparison result. The present invention can diagnose faults of multi-stage pressure output relay valves and accurately locate the fault location inside the multi-stage pressure output relay valves, thereby improving the accuracy of fault judgment without disassembling the multi-stage pressure output relay valves, effectively improving fault detection efficiency, saving time, and reducing manpower consumption.

[0170] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A relay valve fault diagnosis and location method for determining the fault state and fault location of a relay valve having multiple chambers, characterized in that: The relay valve fault diagnosis and positioning method comprises the following steps: Simulating states where failures occur at different locations in the relay valve; respectively collecting simulated internal pressure data and simulated external pressure data of each chamber when a fault occurs at different locations; wherein the simulated internal pressure data and the simulated external pressure data are instantaneous values ​​of the pressure at a time point or a change trend within a time period; Establishing a fault model of the relay valve based on the collected simulated internal pressure data and simulated external pressure data; respectively collecting actual internal pressure data of each of the chambers and actual external pressure data corresponding to each of the chambers; comparing the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data; The comparing the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data includes: comparing the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model; Selecting, from the fault model, the simulated internal pressure data and the simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data as the fault data; Determining, based on the fault data, a fault state corresponding to the relay valve and a fault location in the fault model; Determine the fault status and fault location of the relay valve.

2. The relay valve fault diagnosis and positioning method according to claim 1, characterized in that: The actual internal pressure data of the chamber is the internal pressure of the chamber or the output pressure of the chamber under actual working conditions.

3. The relay valve fault diagnosis and positioning method according to claim 2, characterized in that: A pressure collection hole is reserved on each chamber or at the exhaust port of each chamber, and the actual internal pressure data of the corresponding chamber is collected through the pressure collection hole.

4. The relay valve fault diagnosis and positioning method according to claim 1, characterized in that: The actual external pressure data of the chamber is the input pressure of the chamber under actual working conditions.

5. The relay valve fault diagnosis and positioning method according to claim 4, characterized in that: The air inlet of each chamber is connected to the corresponding external air circuit respectively, and the pressure in the corresponding external air circuit or the pressure at the air inlet of the chamber is collected as the actual external pressure data of the corresponding chamber.

6. The relay valve fault diagnosis and positioning method according to claim 1, characterized in that: The fault state and fault location corresponding to the relay valve in the fault model are the fault state and fault location of the relay valve under actual working conditions.

7. A relay valve fault diagnosis and positioning device, which uses the relay valve fault diagnosis and positioning method according to any one of claims 1 to 6 to determine the fault state and fault location of a relay valve having multiple chambers, characterized in that: The relay valve fault diagnosis and positioning device includes: a data acquisition unit, configured to respectively acquire actual internal pressure data of each of the chambers and actual external pressure data corresponding to each of the chambers; a data processing unit, configured to compare the collected actual internal pressure data and the actual external pressure data with pre-acquired fault data; The fault determination unit is used to determine the fault state and fault location of the relay valve.

8. The relay valve fault diagnosis and positioning device according to claim 7, characterized in that: The relay valve fault diagnosis and positioning device further includes: a fault state simulation unit, used to simulate the state of faults occurring at different positions in the relay valve; a simulation data acquisition unit, for respectively acquiring simulated internal pressure data and simulated external pressure data of each of the chambers when a fault occurs at different locations; The fault model establishing unit is used to establish a fault model of the relay valve according to the collected simulated internal pressure data and simulated external pressure data.

9. The relay valve fault diagnosis and positioning device according to claim 8, characterized in that: The data processing unit includes: a data comparison module, configured to compare the actual internal pressure data and the actual external pressure data with the simulated internal pressure data and the simulated external pressure data in the fault model; a fault data determination module, configured to select, from the fault model, the simulated internal pressure data and the simulated external pressure data having the same pressure value or the same pressure value change trend as the actual internal pressure data and the actual external pressure data, as the fault data; The fault determination module is used to determine the fault state corresponding to the relay valve and the fault location in the fault model according to the fault data.

10. The relay valve fault diagnosis and positioning device according to claim 8, characterized in that: The data acquisition unit includes a pressure sensor. A pressure acquisition hole is reserved on each chamber or at the exhaust port of each chamber, and the pressure sensor is arranged at the pressure acquisition hole.

11. The relay valve fault diagnosis and positioning device according to claim 8, characterized in that: The relay valve fault diagnosis and positioning device also includes a test device, which is provided with an air circuit interface that can supply air to the outside. The air circuit interface is connected to one end of the external air circuit, and the other end of the external air circuit is respectively connected to the air inlet of each of the chambers. The air supply pressure into each of the chambers is controlled and collected by the test equipment to simulate the working condition of the relay valve when it is in a fault.

12. The relay valve fault diagnosis and positioning device according to claim 8, characterized in that: The relay valve fault diagnosis and positioning device also includes a data analysis device, which includes at least a data processing unit and a fault determination unit. The data analysis device is used to analyze the collected actual internal pressure data and the actual external pressure data according to the fault model to determine the fault state of the relay valve and the location of the fault.

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