An independent heat dissipation hydraulic system fault automatic diagnosis system, method and device

Abstract

The application discloses an independent heat dissipation hydraulic system fault automatic diagnosis system, method and device in the technical field of engineering machinery, and aims to solve the problems of inconvenient operation, low applicability and inaccurate determination result in the prior art independent heat dissipation hydraulic system fault diagnosis. The application comprises an independent heat dissipation hydraulic system, a controller and a data acquisition unit, wherein the independent heat dissipation hydraulic system comprises a power source, a heat dissipation pump, a fan valve group and a fan motor; the input end of the controller is electrically connected with the data acquisition unit, and the output end is electrically connected with the power source and the heat dissipation pump. The application is suitable for excavators, can realize fault diagnosis of the heat dissipation pump, the fan valve group and the fan motor through pressure change, has many diagnosis items, has high applicability, reduces fault troubleshooting time, improves machine attendance rate, considers the influence of hydraulic oil temperature change on pressure change, and improves fault diagnosis accuracy.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to an automatic fault diagnosis system, method and device for an independent cooling hydraulic system. Background Technology

[0002] The independent cooling hydraulic system of an excavator includes major hydraulic components such as a power source, cooling pump, fan valve assembly, and fan motor. Currently, troubleshooting of these components often only occurs when hydraulic oil or water temperature alarms are triggered. This requires maintenance personnel to segment and shield the connecting pipelines between components and measure the pressure of each section individually to pinpoint the specific faulty component. In contrast, the self-diagnosis system for tunneling machines applies a fixed load of 100 bar to the motor and sets a fixed speed of 1000 rpm. By measuring the leakage at the motor's oil leakage port, a leakage rate greater than 3 L / min is considered a motor failure.

[0003] However, the above method can only diagnose motor faults, and cannot automatically diagnose faults in pumps and reversing devices. Its applicability is limited and cannot meet actual usage needs. Furthermore, it does not consider the influence of hydraulic oil temperature, resulting in low accuracy of the diagnosis. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic fault diagnosis system, method and device for independent cooling hydraulic systems, solving the problems of cumbersome operation, low applicability and inaccurate judgment results in the current fault diagnosis of independent cooling hydraulic systems.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides an automatic fault diagnosis system for an independent cooling hydraulic system, the independent cooling hydraulic system comprising: a power source, a cooling pump, a fan valve assembly, and a fan motor; the power source is connected to the cooling pump for driving the cooling pump to rotate, the oil outlet of the cooling pump is connected to the first oil port of the fan valve assembly, the second oil port of the fan valve assembly is connected to the first oil port of the fan motor, and the third oil port of the fan valve assembly is connected to the second oil port of the fan motor.

[0007] It also includes: a controller and a data acquisition unit, wherein the data acquisition unit is used to acquire the hydraulic oil temperature at the outlet of the cooling pump, the pressure at the drain port of the cooling pump, the pressure at the drain port of the fan motor, the pressure at the first port of the fan valve assembly, the pressure at the second port of the fan valve assembly, and the pressure at the third port of the fan valve assembly.

[0008] The controller's input terminal is electrically connected to the data acquisition unit, and its output terminal is electrically connected to the power source and the cooling pump. It is used to control the power source speed and the cooling pump's operating status. At the same time, it outputs corresponding fault diagnosis results based on the cooling pump's outlet hydraulic oil temperature, cooling pump's drain port pressure, fan motor's drain port pressure, fan valve group's first port pressure, fan valve group's second port pressure, and fan valve group's third port pressure.

[0009] Furthermore, the data acquisition unit includes: a first pressure sensor for acquiring the pressure at the drain port of the cooling pump, a second pressure sensor for acquiring the pressure at the drain port of the fan motor, a third pressure sensor for acquiring the pressure at the first oil port of the fan valve assembly, a fourth pressure sensor for acquiring the pressure at the second oil port of the fan valve assembly, a fifth pressure sensor for acquiring the pressure at the third oil port of the fan valve assembly, and an oil temperature sensor for acquiring the hydraulic oil temperature at the outlet of the cooling pump.

[0010] Furthermore, the cooling pump is a variable pump using a pressure electro-proportional control method. When the set pressure of the proportional relief valve of the cooling pump is greater than the outlet pressure of the cooling pump, the cooling pump will maintain the maximum displacement working state.

[0011] Secondly, the present invention will provide an automatic fault diagnosis method for an independent cooling hydraulic system, employing the automatic fault diagnosis system for an independent cooling hydraulic system described in the first aspect, comprising the following steps:

[0012] The power source is made to rotate at a set speed and the cooling pump is put into maximum displacement operation.

[0013] The pressure at the drain port of the cooling pump, the pressure at the drain port of the fan motor, the pressure at the first oil port of the fan valve assembly, the pressure at the second oil port of the fan valve assembly, the pressure at the third oil port of the fan valve assembly, and the hydraulic oil temperature at the outlet of the cooling pump are obtained.

[0014] Based on the hydraulic oil temperature at the outlet of the cooling pump, and combined with the predetermined correlation between hydraulic oil temperature and safety judgment range, the safety judgment range of the cooling pump, fan motor and fan valve assembly at the current moment is obtained.

[0015] Based on the oil drain port pressure of the radiator pump, the oil drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, the third oil port pressure of the fan valve assembly, and the fault diagnosis logic, the safety judgment values ​​of the radiator pump, fan motor, and fan valve assembly are obtained.

[0016] The safety judgment value is compared with the corresponding safety judgment interval, and the corresponding fault diagnosis result is output based on the comparison result.

[0017] Furthermore, the method for determining the correlation between the hydraulic oil temperature and the safety judgment range includes:

[0018] The power source is made to rotate at a set speed and the cooling pump is put into maximum displacement operation.

[0019] The hydraulic oil temperature is divided into equal intervals according to its high and low temperatures to obtain multiple oil temperature calibration ranges;

[0020] The pressure values ​​of the drain port pressure of the cooling pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly at different times were measured and statistically analyzed within each oil temperature calibration range.

[0021] Based on the fault diagnosis logic and the pressure values ​​at different times of the drain port pressure of the radiator pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly within each oil temperature calibration range, the safety judgment range of the radiator pump, fan motor, and fan valve assembly is calibrated.

[0022] Furthermore, the fault diagnosis logic includes:

[0023] If SP1 > SP1 MAX If *(100+X)%, it is determined that the cooling pump has an internal leakage fault;

[0024] If SP1 MAX <SP1≤SP1 MAX If *(100+X)%, it is determined that the cooling pump has slight wear, and an early warning reminder is issued to repair the cooling pump.

[0025] If SP1≤SP1 MAX If so, the cooling pump is considered to be in normal condition;

[0026] In the formula, SP1 represents the drain port pressure of the radiator pump. MAX This indicates the maximum pressure at the drain port of the cooling pump.

[0027] Furthermore, the fault diagnosis logic includes:

[0028] If SP2 > SP2 MAX If *(100+Y)%, then the fan motor is determined to have an internal leakage fault.

[0029] If SP2 MAX <SP2≤SP2 MAX If *(100+Y)%, it is determined that the fan motor is slightly worn, and an early warning is issued to remind the fan motor to be repaired.

[0030] If SP2≤SP2 MAX If so, the fan motor is considered to be in normal condition;

[0031] If SP3 - SP4 < (SP3 - SP4) MIN And SP4 > SP4 MAX If so, it is determined that the fan motor is stuck.

[0032] In the formula, SP2 represents the oil drain port pressure of the fan motor, SP4 represents the second oil port pressure of the fan valve assembly, and SP2 MAX SP4 indicates the maximum pressure at the fan motor's drain port. MAX This indicates the maximum pressure at the second port of the fan valve assembly, (SP3-SP4). MIN This represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly.

[0033] Furthermore, the fault diagnosis logic includes:

[0034] If SP3 - SP4 > (SP3 - SP4) MAX If so, it is determined that the fan valve assembly has a jamming fault;

[0035] If (SP3-SP4) MIN <SP3-SP4<(SP3-SP4) MAX If so, the fan valve assembly is determined to be in normal condition;

[0036] If SP1≤SP1 MAX And SP2≤SP2 MAX And SP4 < SP4 MIN If so, it is determined that the fan valve assembly has an internal leakage fault;

[0037] If SP5 > SP5 MAX If so, it is determined that the fan valve assembly is stuck or the oil return circuit is blocked;

[0038] In the formula, SP3 represents the first port pressure of the fan valve assembly, SP4 represents the second port pressure of the fan valve assembly, SP5 represents the third port pressure of the fan valve assembly, and (SP3-SP4) MAX This represents the maximum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly, (SP3-SP4). MIN SP4 represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly. MIN SP5 indicates the minimum pressure at the second port of the fan valve assembly. MAX This indicates the maximum pressure at the third port of the fan valve assembly.

[0039] Thirdly, the present invention provides an automatic fault diagnosis device for an independent cooling hydraulic system, comprising a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method described in the first aspect.

[0040] Fourthly, the present invention provides a computer-readable storage medium for storing one or more programs, said one or more programs including instructions that, when executed by a computing device, cause the computing device to perform any of the methods according to the first aspect.

[0041] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0042] 1. This invention uses pressure sensors to detect the pressure values ​​at the oil drain port of the cooling pump, the oil drain port of the fan motor, the oil outlet of the cooling pump, the second oil port of the fan valve assembly, the second oil port of the fan valve assembly, and the third oil port of the fan valve assembly. By measuring pressure changes, it enables fault diagnosis of multiple components, including the cooling pump, the fan valve assembly, and the fan motor. It has a wide range of diagnostic items, high applicability, reduces troubleshooting time, improves machine uptime, and can meet actual usage needs.

[0043] 2. This invention collects the hydraulic oil temperature at the outlet of the cooling pump using a temperature sensor. It takes into account the impact of hydraulic oil temperature changes on pressure changes, thereby improving the accuracy of fault diagnosis and reducing the complexity of data testing and analysis.

[0044] 3. This invention can provide early warning of malfunctions in the cooling pump and fan motor of an independent cooling hydraulic system, reduce the risk of hydraulic system contamination caused by destructive malfunctions, and reduce economic losses caused by malfunctions. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a schematic diagram of the structure of an automatic fault diagnosis system for an independent cooling hydraulic system provided in an embodiment of the present invention;

[0047] Figure 2 yes Figure 1 The diagram shows the connection of the controller in the automatic fault diagnosis system for the independent cooling hydraulic system.

[0048] Figure 3 This is a schematic diagram of the structure of an automatic fault diagnosis system for an independent cooling hydraulic system provided in an embodiment of the present invention;

[0049] In the diagram: 1. Cooling pump; 1a. Cooling pump oil outlet; 1b. Cooling pump oil drain port; 2. Fan valve assembly; 2a. Fan valve assembly first oil port; 2b. Fan valve assembly second oil port; 2c. Fan valve assembly third oil port; 3. Fan motor; 3a. Fan motor first oil port; 3b. Fan motor second oil port; 3c. Fan motor oil drain port; 4. Controller; 5. Data acquisition unit; 51. First pressure sensor; 52. Second pressure sensor; 53. Third pressure sensor; 54. Fourth pressure sensor; 55. Fifth pressure sensor; 56. Oil temperature sensor; 6. Power source. Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0051] Example 1:

[0052] This invention provides an automatic fault diagnosis system for an independent cooling hydraulic system. The independent cooling hydraulic system includes: a power source 6, a cooling pump 1, a fan valve assembly 2, and a fan motor 3. The power source 6 is connected to the cooling pump 1 for driving the cooling pump 1 to rotate. The oil outlet 1a of the cooling pump 1 is connected to the first oil outlet 2a of the fan valve assembly 2, the second oil outlet 2b of the fan valve assembly 2 is connected to the first oil outlet 3a of the fan motor 3, and the third oil outlet 2c of the fan valve assembly 2 is connected to the second oil outlet 3b of the fan motor 3.

[0053] It also includes: controller 4 and data acquisition unit 5. Data acquisition unit 5 is used to collect the hydraulic oil temperature at the outlet 1a of the cooling pump 1, the pressure at the drain port 1b of the cooling pump 1, the pressure at the drain port 3c of the fan motor 3, the pressure at the first port 2a of the fan valve group 2, the pressure at the second port 2b of the fan valve group 2, and the pressure at the third port 2c of the fan valve group 2.

[0054] The input terminal of the controller 4 is electrically connected to the data acquisition unit 5, and the output terminal is electrically connected to the power source 6 and the cooling pump 1. It is used to control the speed of the power source 6 and the working status of the cooling pump 1. At the same time, it outputs the corresponding fault diagnosis results based on the hydraulic oil temperature at the outlet 1a of the cooling pump 1, the pressure at the drain port 1b of the cooling pump 1, the pressure at the drain port 3c of the fan motor 3, the pressure at the first oil port 2a of the fan valve group 2, the pressure at the second oil port 2b of the fan valve group 2, and the pressure at the third oil port 2c of the fan valve group 2.

[0055] In this embodiment, the data acquisition unit 5 includes: a first pressure sensor 51 for acquiring the pressure of the drain port 1b of the cooling pump 1, a second pressure sensor 52 for acquiring the pressure of the drain port 3c of the fan motor 3, a third pressure sensor 53 for acquiring the pressure of the first oil port 2a of the fan valve assembly 2, a fourth pressure sensor 54 for acquiring the pressure of the second oil port 2b of the fan valve assembly 2, a fifth pressure sensor 55 for acquiring the pressure of the third oil port 2c of the fan valve assembly 2, and an oil temperature sensor 56 for acquiring the hydraulic oil temperature of the outlet port 1a of the cooling pump 1.

[0056] In this embodiment, the heat pump 1 is a variable pump using a pressure electro-proportional control method. When the set pressure of the proportional relief valve of the heat pump 1 is greater than the outlet pressure of the heat pump 1, the heat pump 1 will maintain the maximum displacement working state.

[0057] It should be noted that if the cooling pump 1 is a variable pump using a pressure electro-proportional control method, then if the outlet pressure of the cooling pump 1 does not reach the set pressure of the cooling pump proportional relief valve, the cooling pump 1 will always maintain the maximum displacement operating state. Based on this characteristic, by setting the operating parameters of the power source 6 speed n0 and the cooling pump 1 control current I0, the cooling pump 1 can maintain the maximum displacement state under the above parameter conditions, achieving the effect of stable output flow. This ensures the stability of the fan motor 3 and the fan speed, and without considering the change in fan resistance caused by radiator surface blockage, it can ensure the stability of the load, further guaranteeing the stability and accuracy of the pressure values ​​at various points in the independent cooling hydraulic system at a certain hydraulic oil temperature value.

[0058] Example 2:

[0059] like Figure 3 As shown, this embodiment provides an automatic fault diagnosis method for an independent cooling hydraulic system, including the following steps:

[0060] Step 1: Rotate the power source at the set speed and put the cooling pump at maximum displacement.

[0061] Understandably, step 1 is used to ensure that the cooling pump always outputs a constant flow rate, thereby improving the accuracy of the diagnosis by controlling the variables.

[0062] Step 2: Obtain the drain port pressure of the cooling pump, the drain port pressure of the fan motor, the first port pressure of the fan valve assembly, the second port pressure of the fan valve assembly, the third port pressure of the fan valve assembly, and the hydraulic oil temperature at the outlet of the cooling pump.

[0063] Step 3: Based on the hydraulic oil temperature at the outlet of the cooling pump, and combined with the predetermined correlation between hydraulic oil temperature and safety judgment range, obtain the current safety judgment range for the cooling pump, fan motor, and fan valve assembly.

[0064] Step 4: Based on the drain port pressure of the radiator pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, the third oil port pressure of the fan valve assembly, and the fault diagnosis logic, obtain the safety judgment values ​​for the radiator pump, fan motor, and fan valve assembly.

[0065] Step 5: Compare the safety judgment value with the corresponding safety judgment interval, and output the corresponding fault diagnosis result based on the comparison result.

[0066] In this embodiment, the method for determining the correlation between hydraulic oil temperature and the safety judgment range in step 3 includes:

[0067] S1: Make the power source rotate at the set speed and put the cooling pump in the maximum displacement working state.

[0068] Understandably, step S1 is used to ensure that the cooling pump always outputs a constant flow rate.

[0069] S2: Divide the hydraulic oil temperature into equal intervals according to the temperature range to obtain multiple oil temperature calibration ranges.

[0070] It should be noted that, for precise control, the safety judgment range can be calibrated for every 1°C change in temperature; for simpler control, the safety judgment range can be calibrated for every 5°C change in temperature; however, this is not the only option. The hydraulic oil temperature range can be adjusted according to actual needs, and there are no specific limitations.

[0071] S3: Measure and statistically analyze the pressure values ​​at different times for the drain port pressure of the cooling pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly within each oil temperature calibration range.

[0072] S4: Based on the fault diagnosis logic and the pressure values ​​of the drain port pressure of the radiator pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly at different times within each oil temperature calibration range, calibrate the safety judgment range of the radiator pump, the fan motor, and the fan valve assembly.

[0073] In this embodiment, the fault diagnosis logic includes:

[0074] If SP1 > SP1 MAX If *(100+X)%, it is determined that the cooling pump has an internal leakage fault;

[0075] If SP1 MAX <SP1≤SP1 MAXIf *(100+X)%, it is determined that the cooling pump has slight wear, and an early warning reminder is issued to repair the cooling pump.

[0076] If SP1≤SP1 MAX If so, the cooling pump is considered to be in normal condition;

[0077] In the formula, SP1 represents the drain port pressure of the radiator pump. MAX This indicates the maximum pressure at the drain port of the cooling pump.

[0078] Understandably, the purpose of issuing a warning to inspect the cooling pump is to prevent further wear and tear on components, which could lead to contamination of the hydraulic system and ensure the stability of the independent cooling hydraulic system.

[0079] Specifically, X is set to 5 in this embodiment, but it is not limited to this and can be adjusted accordingly based on the actual application.

[0080] In this embodiment, the fault diagnosis logic includes:

[0081] If SP2 > SP2 MAX If *(100+Y)%, then the fan motor is determined to have an internal leakage fault.

[0082] If SP2 MAX <SP2≤SP2 MAX If *(100+Y)%, it is determined that the fan motor is slightly worn, and an early warning is issued to remind the fan motor to be repaired.

[0083] If SP2≤SP2 MAX If so, the fan motor is considered to be in normal condition;

[0084] If SP3 - SP4 < (SP3 - SP4) MIN And SP4 > SP4 MAX If so, it is determined that the fan motor is stuck.

[0085] In the formula, SP2 represents the oil drain port pressure of the fan motor, SP4 represents the second oil port pressure of the fan valve assembly, and SP2 MAX SP4 indicates the maximum pressure at the fan motor's drain port. MAX This indicates the maximum pressure at the second port of the fan valve assembly, (SP3-SP4). MIN This represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly.

[0086] Understandably, the purpose of issuing a warning to inspect the cooling pump is to prevent further wear and tear on components, which could lead to contamination of the hydraulic system and ensure the stability of the independent cooling hydraulic system.

[0087] Specifically, Y is set to 5 in this embodiment, but it is not limited to this and can be adjusted accordingly based on the actual application.

[0088] In this embodiment, the fault diagnosis logic includes:

[0089] If SP3 - SP4 > (SP3 - SP4) MAX If so, it is determined that the fan valve assembly has a jamming fault;

[0090] If (SP3-SP4) MIN <SP3-SP4<(SP3-SP4) MAX If so, the fan valve assembly is determined to be in normal condition;

[0091] If SP1≤SP1 MAX And SP2≤SP2 MAX And SP4 < SP4 MIN If so, it is determined that the fan valve assembly has an internal leakage fault;

[0092] If SP5 > SP5 MAX If so, it is determined that the fan valve assembly is stuck or the oil return circuit is blocked;

[0093] In the formula, SP3 represents the first port pressure of the fan valve assembly, SP4 represents the second port pressure of the fan valve assembly, SP5 represents the third port pressure of the fan valve assembly, and (SP3-SP4) MAX This represents the maximum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly, (SP3-SP4). MIN SP4 represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly. MIN SP5 indicates the minimum pressure at the second port of the fan valve assembly. MAX This indicates the maximum pressure at the third port of the fan valve assembly.

[0094] Example 3:

[0095] This embodiment provides an automatic fault diagnosis device for an independent cooling hydraulic system, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method described in Embodiment 2.

[0096] Example 4:

[0097] This embodiment provides a computer-readable storage medium for storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform the method according to Embodiment 2.

[0098] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0099] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0100] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0101] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0102] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic fault diagnosis system for an independent cooling hydraulic system, characterized in that, The independent cooling hydraulic system includes: a power source (6), a cooling pump (1), a fan valve assembly (2), and a fan motor (3); the power source (6) is connected to the cooling pump (1) for driving the cooling pump (1) to rotate; the oil outlet (1a) of the cooling pump (1) is connected to the first oil outlet (2a) of the fan valve assembly (2); the second oil outlet (2b) of the fan valve assembly (2) is connected to the first oil outlet (3a) of the fan motor (3); and the third oil outlet (2c) of the fan valve assembly (2) is connected to the second oil outlet (3b) of the fan motor (3). It also includes: a controller (4) and a data acquisition unit (5), the data acquisition unit (5) being used to acquire the hydraulic oil temperature at the outlet (1a) of the cooling pump (1), the pressure at the drain port (1b) of the cooling pump (1), the pressure at the drain port (3c) of the fan motor (3), the pressure at the first port (2a) of the fan valve group (2), the pressure at the second port (2b) of the fan valve group (2), and the pressure at the third port (2c) of the fan valve group (2); The input terminal of the controller (4) is electrically connected to the data acquisition unit (5), and the output terminal is electrically connected to the power source (6) and the cooling pump (1). It is used to control the speed of the power source (6) and the working state of the cooling pump (1). At the same time, according to the hydraulic oil temperature at the outlet (1a) of the cooling pump (1), the pressure at the drain port (1b) of the cooling pump (1), the pressure at the drain port (3c) of the fan motor (3), the pressure at the first oil port (2a) of the fan valve group (2), the pressure at the second oil port (2b) of the fan valve group (2), and the pressure at the third oil port (2c) of the fan valve group (2), the corresponding fault diagnosis results are output. The controller (4) is also used to perform the following steps: The power source is made to rotate at a set speed and the cooling pump is put into maximum displacement operation. The pressure at the drain port of the cooling pump, the pressure at the drain port of the fan motor, the pressure at the first oil port of the fan valve assembly, the pressure at the second oil port of the fan valve assembly, the pressure at the third oil port of the fan valve assembly, and the hydraulic oil temperature at the outlet of the cooling pump are obtained. Based on the hydraulic oil temperature at the outlet of the cooling pump, and combined with the predetermined correlation between hydraulic oil temperature and safety judgment range, the safety judgment range of the cooling pump, fan motor and fan valve assembly at the current moment is obtained. Based on the oil drain port pressure of the radiator pump, the oil drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, the third oil port pressure of the fan valve assembly, and the fault diagnosis logic, the safety judgment values ​​of the radiator pump, fan motor, and fan valve assembly are obtained. The safety judgment value is compared with the corresponding safety judgment interval, and the corresponding fault diagnosis result is output based on the comparison result. The fault diagnosis logic includes: like If so, it is determined that the fan motor has an internal leakage fault; like If the fan motor is slightly worn, an early warning will be issued to remind the fan motor to be repaired. like If so, the fan motor is considered to be in normal condition; like and If so, it is determined that the fan motor is stuck. In the formula, This represents a preset constant. This indicates the oil drain pressure of the fan motor. This indicates the pressure at the first oil port of the fan valve assembly. This indicates the pressure at the second port of the fan valve assembly. This indicates the maximum pressure at the fan motor's drain port. This indicates the maximum pressure at the second port of the fan valve assembly. This represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly.

2. The automatic fault diagnosis system for an independent cooling hydraulic system according to claim 1, characterized in that, The data acquisition unit (5) includes: a first pressure sensor (51) for acquiring the pressure of the drain port (1b) of the cooling pump (1), a second pressure sensor (52) for acquiring the pressure of the drain port (3c) of the fan motor (3), a third pressure sensor (53) for acquiring the pressure of the first oil port (2a) of the fan valve group (2), a fourth pressure sensor (54) for acquiring the pressure of the second oil port (2b) of the fan valve group (2), a fifth pressure sensor (55) for acquiring the pressure of the third oil port (2c) of the fan valve group (2), and an oil temperature sensor (56) for acquiring the hydraulic oil temperature of the outlet port (1a) of the cooling pump (1).

3. The automatic fault diagnosis system for an independent cooling hydraulic system according to claim 1, characterized in that, The heat pump (1) is a variable pump using a pressure electro-proportional control method. When the pressure set by the proportional relief valve of the heat pump (1) is greater than the outlet pressure of the heat pump (1), the heat pump (1) will maintain the maximum displacement working state.

4. An automatic fault diagnosis method for an independent cooling hydraulic system, characterized in that, The automatic fault diagnosis system for an independent cooling hydraulic system as described in any one of claims 1 to 3 includes the following steps: The power source is made to rotate at a set speed and the cooling pump is put into maximum displacement operation. The pressure at the drain port of the cooling pump, the pressure at the drain port of the fan motor, the pressure at the first oil port of the fan valve assembly, the pressure at the second oil port of the fan valve assembly, the pressure at the third oil port of the fan valve assembly, and the hydraulic oil temperature at the outlet of the cooling pump are obtained. Based on the hydraulic oil temperature at the outlet of the cooling pump, and combined with the predetermined correlation between hydraulic oil temperature and safety judgment range, the safety judgment range of the cooling pump, fan motor and fan valve assembly at the current moment is obtained. Based on the drain port pressure of the radiator pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly, as well as the fault diagnosis logic, the safety judgment values ​​of the radiator pump, fan motor, and fan valve assembly are obtained. The safety judgment value is compared with the corresponding safety judgment interval, and the corresponding fault diagnosis result is output based on the comparison result. The fault diagnosis logic includes: like If so, it is determined that the fan motor has an internal leakage fault; like If the fan motor is slightly worn, an early warning will be issued to remind the fan motor to be repaired. like If so, the fan motor is considered to be in normal condition; like and If so, it is determined that the fan motor is stuck. In the formula, This represents a preset constant. This indicates the oil drain pressure of the fan motor. This indicates the pressure at the first oil port of the fan valve assembly. This indicates the pressure at the second port of the fan valve assembly. This indicates the maximum pressure at the fan motor's drain port. This indicates the maximum pressure at the second port of the fan valve assembly. This represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly.

5. The automatic fault diagnosis method for an independent cooling hydraulic system according to claim 4, characterized in that, The method for determining the correlation between the hydraulic oil temperature and the safety judgment range includes: The power source is made to rotate at a set speed and the cooling pump is put into maximum displacement operation. The hydraulic oil temperature is divided into equal intervals according to its high and low temperatures to obtain multiple oil temperature calibration ranges; The pressure values ​​of the drain port pressure of the cooling pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly at different times were measured and statistically analyzed within each oil temperature calibration range. Based on the fault diagnosis logic and the pressure values ​​at different times of the drain port pressure of the radiator pump, the drain port pressure of the fan motor, the first oil port pressure of the fan valve assembly, the second oil port pressure of the fan valve assembly, and the third oil port pressure of the fan valve assembly within each oil temperature calibration range, the safety judgment range of the radiator pump, fan motor, and fan valve assembly is calibrated.

6. The automatic fault diagnosis method for an independent cooling hydraulic system according to claim 4, characterized in that, The fault diagnosis logic includes: like If so, it is determined that the cooling pump has an internal leakage fault; like If the condition is found to be slightly worn, a warning will be issued to remind the user to repair the cooling pump. like If so, the cooling pump is considered to be in normal condition; In the formula, This represents a preset constant. This indicates the pressure at the drain port of the radiator pump. This indicates the maximum pressure at the drain port of the cooling pump.

7. The automatic fault diagnosis method for an independent cooling hydraulic system according to claim 4, characterized in that, The fault diagnosis logic includes: like If so, it is determined that the fan valve assembly has a jamming fault; like If so, the fan valve assembly is determined to be in normal condition; like and and If so, it is determined that the fan valve assembly has an internal leakage fault; if If so, it is determined that the fan valve assembly is stuck or the oil return circuit is blocked; In the formula, This indicates the pressure at the drain port of the radiator pump. This indicates the maximum pressure at the drain port of the radiator pump. This indicates the pressure at the first oil port of the fan valve assembly. This indicates the pressure at the second port of the fan valve assembly. This indicates the pressure at the third port of the fan valve assembly. This indicates the maximum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly. This represents the minimum difference between the pressure at the first port of the fan valve assembly and the pressure at the second port of the fan valve assembly. This indicates the minimum pressure at the second port of the fan valve assembly. This indicates the maximum pressure at the third port of the fan valve assembly.

8. An automatic fault diagnosis device for an independent cooling hydraulic system, characterized in that, It includes a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the method according to any one of claims 4 to 7.

9. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform the method of any one of claims 4 to 7.

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