Condenser fan contactor fault detection methods, apparatuses, devices, systems, and media

Abstract

The application provides a condensing fan contactor fault detection method, device, equipment, system and medium. In the condensing fan contactor fault detection method, after it is judged that there is a condensing fan starting demand, a starting control signal is output to control the condensing fan to start, and it is judged whether a contactor feedback signal is received within a preset time. According to the judgment result of the judgment and the current pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, it is determined whether the contactor of the condensing fan currently has a fault. In the application, the contactor is judged to currently have a fault only when the judgment result and the pressure detection data both satisfy the corresponding set conditions, the detection accuracy is high, the probability of false triggering of the contactor fault can be effectively reduced, and the safety and reliability in the refrigeration operation of the air conditioning system are improved. Therefore, the application can improve the problem of low accuracy of condensing fan contactor fault diagnosis in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a condenser fan contactor fault detection method, device, equipment, system and medium. BACKGROUND

[0002] In the existing rail transit air conditioning system, the diagnosis logic for condenser fan contactor faults is mainly based on the digital quantity opening signal output by the control system and the digital quantity feedback signal collected by the controller. Specifically, after the control system outputs the opening signal, if no digital quantity feedback signal is collected after a period of time, it is determined that the contactor of the condenser fan has failed, and relevant protection logic needs to be executed, such as stopping the compressor.

[0003] In the process of implementing the present application, the inventors have found that the existing diagnosis logic for condenser fan contactor faults only relies on the condenser fan contactor opening signal output by the control system and the collected contactor digital quantity feedback signal to determine whether the condenser fan contactor has failed. This diagnosis method has low accuracy and is prone to false triggering of condenser fan contactor fault warnings, so that the air conditioning system protection logic will also be executed when the condenser fan contactor is not truly failed, which affects the normal air conditioning system refrigeration function. SUMMARY

[0004] Therefore, the present application aims to provide a condenser fan contactor fault detection method, device, equipment, system and computer readable storage medium, which can improve the problem of low accuracy of condenser fan contactor fault diagnosis in the prior art.

[0005] According to a first aspect of an embodiment of the present application, a condenser fan contactor fault detection method is provided, which is applied to an air conditioning system. The air conditioning system includes a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser. The condenser fan contactor fault detection method includes:

[0006] determining whether the condenser fan currently has a start-up requirement;

[0007] after the condenser fan has a start-up requirement, outputting a start-up control signal to control the contactor of the condenser fan to close;

[0008] within a preset time after outputting the start-up control signal, determining whether a contactor feedback signal is received to obtain a determination result;

[0009] determining whether the contactor has failed according to the determination result and pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system.

[0010] From the above, the condenser fan contactor fault detection method provided by the application has at least the following advantages:

[0011] In the condenser fan contactor fault detection method provided by the application, after it is judged that there is a current condenser fan starting demand, a starting control signal is output to control the condenser fan to start, and it is judged whether a contactor feedback signal is received within a preset time, and according to the judgment result of the judgment and the current pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, it is determined whether the contactor of the condenser fan currently has a fault. Obviously, in the condenser fan contactor fault detection method provided by the application, the contactor is judged to have a current fault only when the judgment result and the pressure detection data both satisfy the corresponding set conditions, otherwise the diagnosis result of the contactor fault will not be triggered. Therefore, the condenser fan contactor fault detection method provided by the application can more accurately detect whether the contactor of the condenser fan currently has a fault, effectively reduces the probability of false triggering of the contactor fault, and improves the safety and reliability of the air conditioning system during refrigeration operation. In summary, the condenser fan contactor fault detection method provided by the application can improve the problem of low accuracy of condenser fan contactor fault diagnosis in the prior art.

[0012] According to a second aspect of an embodiment of the application, a condenser fan contactor fault detection device is provided, which is applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser connected with the compressor, and a condenser fan corresponding to the condenser, and the condenser fan contactor fault detection device comprises:

[0013] A first judgment module is configured to judge whether the condenser fan currently has a starting demand;

[0014] A starting control module is configured to output a starting control signal to control the contactor of the condenser fan to close after the condenser fan has a starting demand;

[0015] A second judgment module is configured to judge whether a contactor feedback signal is received within a preset time after the starting control signal is output, to obtain a judgment result;

[0016] A fault determination module is configured to determine whether the contactor has a fault according to the judgment result and pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system. Since the condenser fan contactor fault detection device provided by the application is a fault detection device corresponding to the condenser fan contactor fault detection method, and belongs to the same inventive concept, the condenser fan contactor fault detection device provided by the application has the same advantages as the condenser fan contactor fault detection method.

[0017] According to a third aspect of the embodiments of the present application, a condenser fan contactor fault detection device is provided, which is applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser connected with the compressor, and a condenser fan corresponding to the condenser, the condenser fan contactor fault detection device comprising a pressure detector and a controller connected with the pressure detector.

[0018] The pressure detector is configured to detect the pressure of refrigerant in a high-pressure side refrigerant pipeline of the air conditioning system, obtain the pressure detection data, and send the pressure detection data to the controller.

[0019] The controller comprises a memory and a processor, and the memory stores a computer program executable by the processor, and the computer program is executed by the processor to implement the condenser fan contactor fault detection method. Since the condenser fan contactor fault detection device provided by the present application can implement the condenser fan contactor fault detection method, the condenser fan contactor fault detection device provided by the present application has the same advantages as the condenser fan contactor fault detection method.

[0020] According to a fourth aspect of the embodiments of the present application, an air conditioning system is provided, comprising a compressor, a condenser connected with the compressor, and a condenser fan corresponding to the condenser, and the air conditioning system further comprises the condenser fan contactor fault detection device. Since the air conditioning system provided by the present application comprises the condenser fan contactor fault detection device, the air conditioning system provided by the present application has the same advantages as the condenser fan contactor fault detection device.

[0021] According to a fifth aspect of the embodiments of the present application, a vehicle control system is provided, comprising the condenser fan contactor fault detection device and a vehicle monitoring and maintenance system.

[0022] The controller reports contactor fault information to the vehicle monitoring and maintenance system when determining that the contactor is faulty.

[0023] The vehicle monitoring and maintenance system determines whether to provide a contactor fault prompt according to the category of the contactor fault information. Since the vehicle control system provided by the present application comprises the condenser fan contactor fault detection device, the vehicle control system provided by the present application has the same advantages as the condenser fan contactor fault detection device.

[0024] According to a third aspect of the embodiments of the present application, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the condenser fan contactor fault detection method. Since the computer readable storage medium provided by the present application can implement the condenser fan contactor fault detection method when executed by a processor, the computer readable storage medium provided by the present application has the same advantages as the condenser fan contactor fault detection method. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0026] Figure 1 A structure schematic diagram of a refrigerating unit in an air conditioning system according to some embodiments of the present application is provided;

[0027] Figure 2 A flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0028] Figure 3 A flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0029] Figure 4 A flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0030] Figure 5 A flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0031] Figure 6 A flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0032] Figure 7 A diagnostic execution flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0033] Figure 8 A diagnostic execution flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0034] Figure 9 A diagnostic execution flowchart of a condenser fan contactor fault detection method according to some embodiments of the present application is provided;

[0035] Figure 10 A structure schematic diagram of a condenser fan contactor fault detection device according to some embodiments of the present application is provided;

[0036] Figure 11 A structure diagram of a controller in a condenser fan contactor fault detection device according to some embodiments of the present application is provided.

[0037] Figure 12 A structure diagram of an air conditioning system according to some embodiments of the present application is provided. DETAILED DESCRIPTION

[0038] The rail transit air conditioning system is a mechatronic, software and hardware combined and integrated system. For the rail air conditioning system, in hot weather, in order to enable the environment temperature in the subway car to achieve the effect of ventilation and comfort, it is particularly important to ensure the normal refrigeration function of the refrigeration unit of the air conditioning system. The condenser fan contactor is an important component in the refrigeration unit of the air conditioning system. Once it fails, the compressor needs to be stopped, so that the refrigeration unit loses the refrigeration capacity and cannot operate in the refrigeration working condition. Therefore, the diagnosis logic of the condenser fan contactor fault is crucial to ensure the refrigeration stability of the air conditioning system.

[0039] In the related art, the diagnosis logic of the condenser fan contactor fault only relies on the condenser fan contactor opening signal output by the control system and the digital quantity feedback signal collected to determine whether the condenser fan contactor fails. This diagnosis method has low accuracy and is easy to trigger the condenser fan contactor fault warning, so that the air conditioning system protection logic is executed when the condenser fan contactor does not really fail. This affects the normal refrigeration function of the air conditioning system, causes the temperature in the passenger compartment to be uncomfortable, and easily causes passenger complaints and other problems.

[0040] To improve the above-mentioned problems, the present application provides a condenser fan contactor fault detection method, device, equipment, system and computer readable storage medium, which can improve the accuracy of the diagnosis of the condenser fan contactor fault.

[0041] The technical solutions of the present application are further described in detail below in combination with the drawings and specific embodiments of the specification.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application merely for the purpose of describing specific embodiments thereof is not intended to limit the implementation modes of the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0043] In the following description, the expression "some embodiments" refers to a subset of all possible embodiments, but it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other as long as there is no conflict.

[0044] Please refer to Figure 1 As shown in the structure schematic diagram of the air conditioning system provided by some embodiments of the present application. The air conditioning system provided by the embodiments of the present application comprises a refrigeration unit, which comprises a compressor 11, a condenser 12 connected with the compressor 11, and a condensing fan 13 corresponding to the condenser 12, that is, the air conditioning system comprises a compressor 11, a condenser 12 connected with the compressor 11, and a condensing fan 13 corresponding to the condenser 12. The compressor 11 and the condenser 12 are connected by a refrigerant pipeline, which is the high-pressure side refrigerant pipeline of the air conditioning system. The compressor 11 can compress the low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant, which can be transported to the condenser 12. The condenser 12 can condense the high-temperature and high-pressure gas refrigerant to form a liquid refrigerant at room temperature and high pressure. The condensing fan 13 can force air to flow through the condenser 12 to improve the heat dissipation efficiency of the condenser 13. Further, the refrigeration unit in the air conditioning system provided by the embodiments of the present application further comprises an evaporator 14 connected with the compressor 11, an evaporating fan 15 corresponding to the evaporator 14, and a throttling device 16 connected between the evaporator 14 and the condenser 12, that is, the air conditioning system further comprises an evaporator 14 connected with the compressor 11, an evaporating fan 15 corresponding to the evaporator 14, and a throttling device 16 connected between the evaporator 14 and the condenser 12. The outlet of the evaporator 15 is connected with the suction port of the compressor 11, the exhaust port of the compressor 11 is connected with the inlet of the condenser 12, the outlet of the condenser 12 is connected with the inlet of the throttling device 16, and the outlet of the throttling device 16 is connected with the inlet of the evaporator 14 to form a circulating loop (refrigerant loop). Among them, the throttling device 16 can throttle and depressurize the high-pressure liquid refrigerant output by the condenser 12 to output low-pressure liquid refrigerant (or gas-liquid mixture) to the evaporator 14. The evaporating fan 15 can force air to flow through the evaporator 14, and the evaporator 14 can absorb the heat of the air flowing therethrough to evaporate the liquid refrigerant flowing out of the throttling device 16 into low-temperature and low-pressure gas refrigerant. The cooled air flows into the space to be cooled, thereby realizing the cooling of the space to be cooled by the air conditioning system.

[0045] Please continue to refer to Figure 1As shown, in the refrigerating unit of the air conditioning system provided by some embodiments of the present application, a high-pressure switch 17 is further included, that is, the air conditioning system further includes the high-pressure switch 17. The high-pressure switch 17 is connected between the exhaust port of the compressor 11 and the inlet of the condenser 12, that is, the high-pressure switch 17 is arranged between the compressor 11 and the condenser 12. The high-pressure switch 17 can protect the air conditioning system from high pressure. When the pressure value of the refrigerant in the high-pressure side (between the exhaust port of the compressor 11 and the inlet of the condenser 12) of the air conditioning system exceeds the set threshold value, the high-pressure switch 17 will automatically be turned off to protect the air conditioning system from high pressure. Until the pressure value of the refrigerant in the high-pressure side is less than or equal to the set threshold value, the high-pressure switch 17 will be turned on again. Wherein, when the high-pressure switch 17 is turned off, the refrigerant circuit in the air conditioning system is disconnected, and when the high-pressure switch 17 is turned on, the refrigerant circuit in the air conditioning system is connected. Wherein, the refrigerant circuit is a refrigerant circulation circuit composed of the compressor 11, the condenser 12, the throttling device 16 and the evaporator 14.

[0046] The condenser fan 13 includes a motor and a contactor connected to the motor. When the condenser fan 13 needs to be started to work, the contactor needs to be controlled to be in a closed state. Obviously, whether the contactor of the condenser fan 13 can be normally closed is crucial to the refrigeration of the air conditioning system. Therefore, how to accurately diagnose whether the contactor of the condenser fan 13 is faulty is an urgent problem to be solved to improve the refrigeration stability of the air conditioning system. For this purpose, some embodiments of the present application provide a condenser fan contactor fault detection method for an air conditioning system as shown. Specifically, please refer to Figure 1 The condenser fan contactor fault detection method as shown. Specifically, please refer to Figure 2 The condenser fan contactor fault detection method as shown. Specifically, please refer to

[0047] S02: Determine whether the condenser fan currently has a starting requirement.

[0048] The current starting demand of the condensing fan 13 can be determined according to whether the starting instruction is received. If the starting instruction is received, it indicates that the condensing fan 13 currently has a starting demand, otherwise, it indicates that there is no starting demand. Since the air conditioning system needs to start the condensing fan 13 when there is a refrigeration demand, the aforementioned starting instruction can also be a refrigeration demand instruction indicating that the air conditioning system currently has a refrigeration demand. In addition, whether the condensing fan 13 currently needs to start can also be determined based on the operating condition data of the air conditioning system. The operating condition data is, for example, the current temperature data, target temperature data of the space to be temperature-regulated of the air conditioning system, and the current operating state of the corresponding refrigeration device in the refrigeration unit of the air conditioning system. Specifically, the refrigeration demand of the air conditioning system can be determined according to the current temperature and the target temperature to be temperature-regulated in the space to be temperature-regulated of the air conditioning system. When the refrigeration demand reaches the set demand, it is determined that the air conditioning system currently needs to start the refrigeration unit to refrigerate, that is, it is determined that the condensing fan 13 currently has a starting demand.

[0049] When the condensing fan 13 has a starting demand, it indicates that the condensing fan 13 currently needs to be started, and the corresponding devices in the refrigeration unit such as the compressor 11 and the throttling device 16 also need to be started to operate, so that the refrigeration unit of the air conditioning system starts to operate refrigeration, that is, the air conditioning system enters the refrigeration working mode.

[0050] S04: After determining that the condensing fan has a starting demand, output a starting control signal to control the contactor of the condensing fan to close.

[0051] The starting of the condensing fan 13 needs the contactor to be closed, so after determining that the condensing fan 13 currently needs to be started, a starting control signal for controlling the contactor of the condensing fan 13 to close needs to be output. Specifically, the starting control signal can be a main contact closing instruction of the contactor of the condensing fan 13, that is, when the contactor of the condensing fan 13 receives the starting control signal, if the contactor is in a normal state, the main contact will be closed under the control of the starting control signal.

[0052] Specifically, in some embodiments, the starting demand of the condensing fan can also be the starting demand of the refrigeration unit in the air conditioning system. When the refrigeration unit has a starting demand, the controller of the air conditioning system will output a starting control signal to the condensing fan 13, that is, a main contact closing instruction of the contactor of the condensing fan. According to the starting control signal, the contactor of the condensing fan can be closed, the condensing fan 13 can be powered to enter a starting state, and then the compressor 11, the throttling device 16 (such as an electronic expansion valve) and the like in the refrigeration unit perform corresponding starting actions, so that the refrigeration unit starts to operate refrigeration.

[0053] S06: Within a preset time after outputting the starting control signal, determine whether a contactor feedback signal is received to obtain a determination result.

[0054] In the output start control signal, if the contactor of the condenser fan 13 is in the normal state, it receives the start control signal, and then starts according to the start control signal and feeds back a contactor feedback signal representing that the contactor is currently in the normal state (can normally close). Therefore, if the contactor feedback signal is not received within the preset time, it means that the contactor may be currently malfunctioning, and if the contactor feedback signal is received within the preset time, it means that the contactor is currently in the normal state. The judgment result in S06 is that the contactor feedback signal is received within the preset time of the output start control signal, or that the contactor feedback signal is not received within the preset time of the output start control signal.

[0055] S08: According to the judgment result and the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, determine whether the contactor is malfunctioning.

[0056] The high-pressure side refrigerant pipeline of the air conditioning system refers to the refrigerant pipeline with relatively high refrigerant pressure in the air conditioning system in the refrigeration mode. Specifically, the high-pressure side refrigerant pipeline of the air conditioning system is the refrigerant pipeline between the exhaust port of the compressor 11 and the inlet of the condenser 12. The pressure detection data is data representing the current pressure of the refrigerant in the high-pressure side refrigerant pipeline. The pressure detection data is generally obtained by a pressure detector, and the pressure detector is usually arranged on the high-pressure side refrigerant pipeline. In this way, the pressure of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system can be detected by the pressure detector to obtain the pressure detection data.

[0057] The existing contactor fault diagnosis method only determines whether the contactor is malfunctioning based on the above-mentioned judgment result, which is too one-sided and easy to cause inaccurate judgment of whether the contactor is malfunctioning. Because in some cases, the contactor may be in the normal state, but it may also not receive the contactor feedback signal within the preset time due to some special reasons. The diagnosis logic of determining whether the contactor is malfunctioning based on the above-mentioned judgment result will judge that the contactor is currently malfunctioning, and then will protect the start logic of the air conditioning system, such as controlling the compressor 11 to stop. This misjudgment reduces the stability of the refrigeration work of the air conditioning system, and easily causes the compressor 11 to start and stop too much, and brings an unsuitable experience to the user of the air conditioning system.

[0058] However, in the condenser fan contactor fault detection method provided in the embodiments of the present application, the inventors found in the research process that when the air conditioning system is in the refrigeration operation mode, if the contactor of the condenser fan does not start normally, the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system is obviously abnormal, and if the contactor starts normally, the pressure detection data is within the normal range. Therefore, a new contactor fault diagnosis logic is provided, which not only judges whether the contactor is faulty based on the above judgment result, but also based on the above pressure detection data. Both need to meet the corresponding set conditions, otherwise the diagnosis result of the contactor fault will not be triggered. Therefore, the condenser fan contactor fault detection method provided in the embodiments of the present application can more accurately detect whether the contactor of the condenser fan is currently faulty, can effectively reduce the probability of false triggering of the contactor fault, and improves the safety and reliability of the air conditioning system in the refrigeration operation. In summary, the condenser fan contactor fault detection method provided in the present application can improve the problem of low accuracy of condenser fan contactor fault diagnosis in the prior art.

[0059] Please refer to Figure 3 Fig. 1 is a flowchart of a condenser fan contactor fault detection method provided according to some embodiments of the present application. In this embodiment, S04 further includes S041 and S042, which are described as follows.

[0060] S041: After determining that the condenser fan has a starting requirement, it is determined whether the starting control signal for controlling the closing of the contactor needs to be output.

[0061] S042: When it is determined that the starting control signal needs to be output, the starting control signal is output to control the closing of the contactor of the condenser fan.

[0062] In this embodiment, after determining that the condenser fan 13 has a starting requirement, the starting control signal is not directly output, but it is first determined whether the starting control signal needs to be output at present, so as to ensure that the starting control signal is output to control the condenser fan 13 to start only when it is determined that the refrigeration unit of the air conditioning system needs to be started to refrigerate, thereby improving the stability of the air conditioning system in the refrigeration operation. Because, in some cases, after determining that the condenser fan 13 has a starting requirement, if there are some other problems in the air conditioning system, the refrigeration unit may not be controlled to operate refrigeration, and therefore the condenser fan 13 does not need to be started at this time. Specifically, when it is determined that the condenser fan 13 has a starting requirement, the running condition parameter data of the air conditioning system can be used to determine whether the starting control signal for controlling the closing of the contactor of the condenser fan 13 needs to be output at present.

[0063] Further, please continue to refer to Figure 3As shown, in the present embodiment, S08 specifically comprises S081 and S082, which are specifically described as follows.

[0064] S081: judging whether the pressure detection data meets the first preset condition.

[0065] S082: determining that the contactor is faulty when the judgment result is that the contactor feedback signal is not received and the current pressure detection data meets the first preset condition.

[0066] Whether the pressure detection data meets the first preset condition can refer to whether the pressure represented by the pressure detection data is outside the normal pressure range, that is, the first preset condition can refer to that the pressure represented by the pressure detection data is outside the normal pressure range, and whether the pressure detection data meets the first preset condition is judged, if yes, it is judged that the pressure detection data meets the first preset condition, otherwise, it is judged that the pressure detection data does not meet the first preset condition. The normal pressure range refers to the pressure range of the refrigerant in the high-pressure side refrigerant pipeline when the contactor of the condenser fan is normally opened and other devices in the refrigerating unit are in the normal working state. The diagnostic logic in the condenser fan contactor fault detection method provided in the present application is that only when the pressure detection data meets the first preset condition, that is, the pressure represented by the pressure detection data is an abnormal pressure and the contactor feedback signal is not received within the preset time, the diagnostic result of the contactor fault is triggered, otherwise, it will not be triggered, which can effectively reduce the misdiagnosis rate of the contactor fault. In the present embodiment, S081 is executed after S06, and in other embodiments, S081 can also be executed before S06, or both.

[0067] In some embodiments, S081 specifically comprises: judging whether the current pressure detection data meets the first preset condition when the judgment result is that the contactor feedback signal is not received. In the condenser fan contactor fault detection method provided in the present application, it is necessary to determine whether the contactor is faulty based on the pressure detection data and the judgment result of whether the contactor feedback signal is received, so it needs to judge whether the contactor feedback signal is received and whether the pressure detection data meets the first preset condition. In the present embodiment, whether the contactor feedback signal is received within the preset time after the start control signal is output is judged first, and when the judgment result is that the contactor feedback signal is not received, the current pressure detection data is judged to determine whether the current pressure detection data meets the first preset condition.

[0068] In other embodiments, the step of judging the pressure detection data can also occur before judging whether the contactor feedback signal is received, or both are performed simultaneously, that is, the order of occurrence of the two is not particularly limited in the present application.

[0069] Please refer to Figure 4 Fig. 8 shows a flowchart of a method for detecting a fault of a condenser fan contactor according to some embodiments of the present application. In this embodiment, S08 specifically includes S083, which is described as follows.

[0070] S083: determining whether the contactor has a fault according to the judgment result, the pressure detection data, and operation time detection data of the air conditioning system.

[0071] The operation time detection data of the air conditioning system can represent a refrigeration operation time of the refrigeration unit of the air conditioning system starting refrigeration operation. When there is a refrigeration demand, the refrigeration unit of the air conditioning system will start and perform refrigeration operation according to the corresponding control instruction. The inventors of the present application found in the research process that when the refrigeration unit of the air conditioning system just starts refrigeration operation, the pressure detection data is prone to be abnormal due to the transient high-low pressure differential change, i.e., the pressure detection data is prone to meet the first preset condition. Therefore, according to the pressure detection data and the above-mentioned judgment result to determine whether the contactor has a fault, there is a certain misdiagnosis rate. However, the embodiment of the present application further determines whether the contactor has a fault based on the above-mentioned operation time detection data on the basis of the above-mentioned judgment result and pressure detection data, which can further improve the detection accuracy (or diagnosis accuracy) of the contactor fault.

[0072] Please continue to refer to Figure 4 Fig. 8 shows a flowchart of a method for detecting a fault of a condenser fan contactor according to some embodiments of the present application. In this embodiment, S08 specifically includes S083, which is described as follows.

[0073] S071: timing the operation time of the air conditioning system to obtain the operation time detection data.

[0074] When the refrigeration unit of the air conditioning system starts refrigeration operation, the refrigeration operation time of the refrigeration unit is timed to obtain the above-mentioned operation time detection data. The controller in the condenser fan contactor fault detection device provided by the embodiment of the present application can have a timing function to time the refrigeration operation time of the refrigeration unit, or an external timer can be used to time the refrigeration operation time, and then the operation time detection data obtained by timing is sent to the controller, so that the controller determines whether the contactor has a fault based on the operation time detection data, the pressure detection data, and the above-mentioned judgment result.

[0075] Please refer to Figure 5 Fig. 8 shows a flowchart of a method for detecting a fault of a condenser fan contactor according to some embodiments of the present application. In this embodiment, S08 specifically includes S083, which is described as follows.

[0076] S0831: determining whether the pressure detection data meets a first preset condition.

[0077] The first preset condition is the same as described above, and the way of determining whether the pressure detection data meets the first preset condition is also the same as described above, which will not be repeated here.

[0078] S0832: determining whether the running time detection data meets a second preset condition.

[0079] Whether the running time detection data meets the second preset condition can mean whether the running time detection data is greater than or equal to a running time threshold, that is, the second preset condition can mean that the running time detection data is greater than or equal to the running time threshold. When the running time detection data is greater than or equal to the running time threshold, it means that the running time detection data meets the second preset condition, otherwise it means that it does not meet. When the running time detection data meets the second preset condition, the pressure detection data of the high-pressure side refrigerant pipeline will not appear abnormal phenomenon due to the high-low pressure difference of the starting moment, so as to avoid the phenomenon that the pressure detection data does not match the actual pressure value in the high-pressure side refrigerant pipeline and may cause the contactor fault misdiagnosis.

[0080] S0833: when the determination result is that the contactor feedback signal is not received, if the current pressure detection data meets the first preset condition, and the current running time detection data meets the second preset condition, it is determined that the contactor is faulty.

[0081] When the determination result is that the contactor feedback signal is not received, and the pressure detection data and the running time detection data meet the first preset condition and the second preset condition respectively, the current fault of the contactor can be accurately determined. In this embodiment, the order of execution of S0831 and S0832 is not limited, and they can be executed in sequence or simultaneously, which is not particularly limited in this application. For example, in some embodiments, S0831 specifically includes: after outputting the start control signal, and when the running time detection data meets the second preset condition, determining whether the pressure detection data meets the first preset condition.

[0082] In some embodiments, S0832 is executed after S0831, that is, whether the pressure detection data meets the first preset condition is determined first, and then the pressure detection data is determined. Therefore, in this embodiment, S0832 specifically includes: when the determination result is that the contactor feedback signal is not received, and the current pressure detection data meets the first preset condition, determining whether the current running time detection data meets the second preset condition.

[0083] Of course, in other embodiments, the running time detection data can also be first judged whether it meets the second preset condition, and after meeting, the pressure detection data is judged whether it meets the first preset condition, that is, in other embodiments, the above S0831 can also include: when the judgment result is that the contactor feedback signal is not received, and the current running time detection data meets the second preset condition, it is judged whether the current pressure detection data meets the first running condition.

[0084] In addition, in some embodiments, the above S0831 and S0832 are executed when the judgment result is that the contactor feedback signal is not received, and when the judgment result is that the contactor feedback signal is received, S0831 and S0832 do not need to be executed again, and the diagnosis result of whether the contactor fails can be determined more quickly. Of course, in other embodiments, the pressure detection data can also be first judged whether it meets the first preset condition, and when it meets, it is judged whether the contactor feedback signal is received within the preset time of outputting the start control signal. In addition, in other embodiments, the running time detection data can also be first judged whether it meets the second preset condition, and when it meets, it is judged whether the contactor feedback signal is received within the preset time of outputting the start control signal. In short, the order of execution of the three steps of judging whether the pressure detection data meets the first preset condition, judging whether the running time detection data meets the second preset condition, and judging whether the contactor feedback signal is received within the preset time of outputting the start control signal is not particularly limited in the present application.

[0085] Please refer to Figure 6 Fig. 9 is a flowchart of a condenser fan contactor fault detection method provided by some embodiments of the present application. In the present embodiment, the condenser fan contactor fault detection method further includes S091, which is described as follows.

[0086] S091: After determining that the contactor fails, controlling the air conditioning system to exit the refrigeration operation mode.

[0087] After determining that the contactor of the condenser fan 13 fails, the protection logic of the refrigeration unit in the air conditioning system needs to be started, that is, the air conditioning system needs to be controlled to exit the refrigeration operation mode, such as controlling the compressor 11 in the refrigeration unit to stop and controlling other devices in the refrigeration unit to stop, so as to stop the current refrigeration operation, thereby avoiding the adverse effects on the refrigeration unit in the case of condenser fan contactor failure.

[0088] Please continue to refer to Figure 6 In the present embodiment, the condenser fan contactor fault detection method further includes S092, which is described as follows.

[0089] S092: After determining that the contactor fails, reporting the contactor fault information.

[0090] After determining that the contactor is faulty, the contactor fault information characterizing the contactor being faulty is further reported to the upper computer control system. The contactor fault information includes a fault category, an identifier and / or a location of the contactor being faulty, etc. The upper computer control system analyzes a processing strategy for the current contact fault according to the contactor fault information, such as determining whether a contactor fault warning prompt is needed at present to notify a maintenance personnel, or the current contactor fault is not processed.

[0091] Please continue to refer to Figure 6 In the embodiment shown, the condenser fan contactor fault detection method further includes S093, which is described as follows.

[0092] S093: After determining that the contactor is faulty, it is judged whether the fault of the contactor is removed.

[0093] The removal of the fault of the contactor means that the current contactor has been considered to be normal by the system. Whether the fault of the contactor is removed can be judged according to whether a contactor fault removal instruction is received at present. If the contactor fault removal instruction is received, it means that the fault is removed. Otherwise, it means that the fault is not removed. Based on the above judgment result, pressure detection data and running time detection data, it can be further diagnosed whether the contactor is faulty. If the diagnosis result is that the contactor is not faulty, it is judged that the fault of the contactor is removed. After the fault of the contactor is removed, the step S02 of judging whether the condenser fan has a starting demand at present is entered again, so as to control the air conditioning system to perform corresponding operation according to the demand.

[0094] Please refer to Figure 7As shown, it is a diagnostic execution flow diagram of the condenser fan contactor fault detection method provided according to some embodiments of the present application. In this embodiment, after starting to execute the condenser fan contactor fault detection flow, firstly, it is judged whether the condenser fan has a starting requirement, if yes, the control system of the condenser fan contactor fault detection method provided by the embodiments of the present application outputs a starting control signal; then, the contactor attraction link of the condenser fan is entered, if in this link, the contactor of the condenser fan is normal and will be normally attracted, the next link contactor will have a running feedback, otherwise, it is indicated that the contactor may have a fault, and the next link has no running feedback. After the contactor attraction link, it is entered to judge whether the contactor has a running feedback link, that is, whether the contactor feeds back the contactor feedback signal representing its normal operation to the control system, if the judgment result is yes, it is determined that the contactor currently has no fault, that is, the contactor fault is not triggered, if the judgment is no, it is necessary to further judge whether the high pressure detection is abnormal, that is, whether the pressure detection data meets the first preset condition, if yes, the fault diagnosis system outputs the diagnosis result of the condenser fan removing the fault. In addition, in this embodiment, it can also be executed firstly whether the high pressure detection is abnormal, if yes, then whether the contactor has a running feedback is executed, if not, the fault diagnosis system outputs the diagnosis result of the condenser fan removing the fault.

[0095] Please refer to Figure 8As shown, it is a diagnostic execution flow diagram of the condenser fan contactor fault detection method provided according to some embodiments of the present application. In this embodiment, after the air conditioning system is started, it is first judged whether there is a condenser fan starting requirement. If there is, the control system of the condenser fan contactor fault detection method provided by the present application outputs a starting control signal. If there is not, the contactor fault diagnosis logic is not executed. After the starting control signal is output, the condenser fan contactor closing link is entered. Thereafter, the compressor and the throttling device are sequentially turned on, and the refrigeration system of the air conditioning system runs, that is, the refrigeration unit of the air conditioning system starts to run refrigeration. After the refrigeration unit runs, high and low pressure detection, refrigeration unit running time detection, and whether the contactor normal feedback signal is received are performed. The high and low pressure detection is realized based on the pressure sensor and the high pressure switch arranged on the high pressure side refrigerant pipeline. The pressure detection data detected by the pressure sensor is further judged in the system high pressure abnormality link, that is, whether the first preset condition is met. If it is normal, it means that the high pressure of the air conditioning system is normal. Otherwise, it means that it is abnormal, which may be caused by the fact that the condenser fan is not actually running. In addition, if the high pressure switch is detected to be opened (tripped), it means that the current pressure detection data is also abnormal, causing the high pressure switch to be opened and the high pressure protection to be started. The refrigeration unit time detection link obtains running time detection data, and then judges the running time detection data to determine whether the running time meets the requirements, that is, whether the running time detection data meets the second preset condition. If it does not meet the requirements, it means that the refrigeration unit of the air conditioning system has not run refrigeration, that is, the air conditioning system has not actually run. When the system high pressure is abnormal, the contactor normal feedback signal is not received, and the running time meets the requirements, the diagnosis conditions and diagnosis time of the contactor fault diagnosis of the fault diagnosis system are determined to meet the requirements, the diagnosis result of the condenser fan contactor fault is triggered, and then the protection logic is started, that is, the refrigeration unit is stopped to run, so that the air conditioning system exits the refrigeration running mode. In addition, the condenser fan contactor fault detection method provided by the present application is applied to the air conditioning system in the rail transit vehicle, and then it further reports the triggered condenser fan contactor fault to the vehicle monitoring and maintenance system of the whole vehicle of the rail transit vehicle, so that the vehicle monitoring and maintenance system judges whether the maintenance personnel is notified based on the received contactor fault information. If it needs to be notified, the maintenance personnel is notified. Otherwise, it does not need to be notified and handled, and then the air conditioning system continues to run. In addition, after the protection logic is started, that is, after the air conditioning system is stopped, if it is determined that the contactor fault is removed, or after the contactor fault is not handled and the contactor fault is removed, the air conditioning system returns to normal, and then the air conditioning system performs the corresponding task according to the requirement.Obviously, in the embodiment, after the diagnostic system diagnoses the result, on the one hand, the control system needs to make protection logic to the compressor in the air conditioning system, for example, measures such as closing the compressor, reducing the frequency, limiting the frequency and the like, to prevent the high pressure from damaging the system components; on the other hand, in the air conditioning system of the rail transit vehicle, the running state of the refrigerating unit and the fault diagnosis information of the contactor in the air conditioning system are reported to the monitoring and maintenance system of the vehicle, so that the vehicle monitoring and maintenance system judges whether the train operation is affected, whether immediate repair processing is needed, and if immediate exit from operation into repair is needed, if the compressor is stopped for a period of time, the fault is removed, the air conditioning system returns to normal, and whether the condensing fan needs to be started again is decided according to whether there is a refrigeration demand at present.

[0096] Please refer to Figure 9As shown, it is a diagnostic execution flow diagram of the condenser fan contactor fault detection method provided according to some embodiments of the present application. When the fault detection method provided in this embodiment starts to execute, it first judges whether there is a refrigeration running requirement, that is, whether the condenser fan has a starting requirement. If the judgment is yes, it respectively executes the judgment of whether to output the starting control signal for closing the condenser fan contactor and the timing of the running time of the compressor, and compares it with the set value to judge whether the running time of the compressor is greater than the set value, that is, whether the running time detection data meets the second preset condition. In this embodiment, the running time detection data is the running time of the compressor. If it is judged that there is no refrigeration running requirement at present, the contactor fault diagnosis logic is not performed. When the judgment of whether to output the starting control signal for closing the condenser fan contactor is yes, the judgment of whether the high-voltage switch is tripped or the high-voltage pressure sensor data is too high is executed, and whether the auxiliary contact (and / or the main contact) of the condenser fan contactor feeds back normally is executed. If it is judged that the high-voltage switch is tripped, it means that the current high-pressure side pressure value is abnormal, that is, the pressure detection data is abnormal data, which meets the first preset condition. The high-voltage pressure sensor is a sensor for obtaining pressure detection data. If the value detected by the high-voltage pressure sensor is too high, it means that the pressure detection data meets the first preset condition, that is, the current pressure value on the high-pressure side is abnormal. If the auxiliary contact of the condenser fan contactor feeds back the contactor feedback signal, it means that the feedback of the auxiliary contact of the condenser fan contactor is normal at present, and the condenser fan contactor fault is not triggered. When there is a refrigeration running requirement, after the condenser fan contactor is closed and the set compressor running time is reached, that is, the compressor passes the starting time, the auxiliary contact of the condenser fan contactor feeds back normally in normal times, the condenser fan runs, the high-pressure pressure will not be too high, and the condenser fan contactor fault will not be diagnosed. If the auxiliary contact feeds back abnormally and the high-pressure pressure value is too high or the high-voltage switch is tripped, it is diagnosed as a condenser fan contactor fault, and the protection logic is executed. When the auxiliary contact of the condenser fan does not feed back normally and the high-voltage switch is tripped or the value of the high-voltage pressure sensor is too high, it is determined that the contactor of the condenser fan is faulty, and then the protection processing is started, such as controlling the air conditioning system to stop refrigeration running. After the protection processing, it is necessary to further determine whether the air conditioning system is restored. If it is restored, the refrigeration requirement judgment link can be re-executed, otherwise, it is maintained. In theory, after a period of compressor shutdown protection measures are executed, the system high and low pressure is restored to normal (high-voltage switch is normal / high-pressure pressure value is normal), and then whether the condenser fan can execute the starting logic again can be determined according to the current refrigeration requirement, so as to ensure the continuous refrigeration capacity of the compressor; if the system is always not restored to normal, the related maintenance system and maintenance unit need to be informed according to the agreed requirements, and they decide whether the train needs to exit the operation according to the fault level, and handle and maintain in time.

[0097] It should be noted that the condenser fan contactor fault detection method provided in the application is not only suitable for the air conditioning system running in the cooling mode, but also suitable for the air conditioning system running in the heating mode, and the implementation scheme refers to the condenser fan contactor fault detection method provided in any embodiment of the application, which will not be repeated here.

[0098] Please refer to Figure 10 The application embodiment provides a condenser fan contactor fault detection device structure diagram as shown in the figure. The condenser fan contactor fault diagnosis device provided in the application embodiment is applied to the air conditioning system provided in any embodiment of the application, which comprises a first judgment module 111, a start control module 112, a second judgment module 113 and a fault determination module 114. The first judgment module 111 is used to judge whether the condenser fan has a starting demand at present. The start control module 112 is used to output a start control signal to control the contactor of the condenser fan to close after the condenser fan has a starting demand. The second judgment module 113 is used to judge whether the contactor feedback signal is received within a preset time after the start control signal is outputted, and the judgment result is obtained. The fault determination module 114 is used to determine whether the contactor has a fault according to the judgment result and the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system. The condenser fan contactor fault detection device provided in the application embodiment achieves the same technical effect as the condenser fan contactor fault detection method provided in the application embodiment, which will not be repeated here.

[0099] Further, the first judgment module 111 is specifically used to judge whether the condenser fan has a starting demand according to the method of judging whether the condenser fan has a starting demand at present in any embodiment of the application.

[0100] Further, the start control module 112 is specifically used to output the start control signal according to the method of outputting the start control signal in any embodiment of the application.

[0101] Further, the second judgment module 113 is specifically used to judge whether the contactor feedback signal is received within a preset time after the start control signal is outputted according to the method of judging whether the contactor feedback signal is received in any embodiment.

[0102] Further, the fault determination module 114 is specifically used to determine whether the contactor has a fault according to the determination method of determining whether the contactor has a fault in any embodiment.

[0103] Please refer to Figure 11As shown, this is a schematic diagram of the controller in a condenser fan contactor fault detection device provided according to some embodiments of this application. The condenser fan contactor fault detection device provided in this application embodiment is applied to an air conditioning system provided according to any embodiment of this application. The condenser fan contactor fault detection device includes a pressure detector and a controller connected to the pressure detector as shown in the diagram. Figure 11 The controller shown is a pressure detector used to detect the pressure of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, obtain pressure detection data, and send it to the controller. The controller includes a memory 211 and a processor 212. The memory 211 stores a computer program that can be executed by the processor 212. When the computer program is executed by the processor 212, it implements the condenser fan contactor fault detection method provided in any embodiment of this application. The condenser fan contactor fault detection device provided according to the embodiments of this application achieves the same technical effect as the condenser fan contactor fault detection method provided in the embodiments of this application, and will not be described in detail here.

[0104] In some embodiments, the pressure detector may be a pressure sensor, such as a high-pressure pressure sensor.

[0105] Please see Figure 12 As shown, this is a schematic diagram of an air conditioning system structure provided according to some embodiments of this application. The air conditioning system provided in the embodiments of this application includes, as follows: Figure 1 The refrigeration unit 1 shown, i.e., the air conditioning system, may include a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, and also includes a condenser fan contactor fault detection device 2, wherein the condenser fan contactor fault detection device 2 includes a pressure detector 20 and such Figure 11 The controller 21 is shown. In other embodiments, the refrigeration unit 1 may also be the refrigeration unit provided in any embodiment of this application, and the condenser fan fault detection device 2 may also be the condenser fan fault detection device provided in any embodiment of this application. In some embodiments, the controller 21 is provided with a timing module to obtain running time detection data. In other embodiments, the condenser fan fault detection device further includes a timer to detect the running time of the air conditioning system, obtain running time detection data, and send it to the controller. The air conditioning system provided according to the embodiments of this application and the condenser fan contactor fault detection method provided according to the embodiments of this application achieve the same technical effect, and will not be described again here.

[0106] In some embodiments, the application also provides a vehicle control system, which comprises the condenser fan contactor fault detection device and the vehicle monitoring and maintenance system according to any one of the embodiments of the application. When the controller in the condenser fan contactor fault detection device determines that the contactor is faulty, the controller reports the contactor fault information to the vehicle monitoring and maintenance system. The vehicle monitoring and maintenance system determines whether the contactor fault prompt is needed according to the category of the contactor fault information.

[0107] The vehicle control system provided by the embodiments of the application can be a control system in a rail transit vehicle. The air conditioner controlled by the control system is an air conditioning system in the rail transit vehicle. The condenser fan contactor fault detection method can be designed based on the current hardware structure and conditions and optimized software logic design. The method can comprehensively consider the requirements for the continuous and stable air conditioning system of the train in normal operation and the effective measures for protecting the air conditioning system when the fault is triggered. The method can minimize the possibility of misdiagnosis, maintain the continuous reliability of the air conditioning system of the train in the hot summer, and provide a comfortable riding environment for passengers.

[0108] In some embodiments, the application also provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement each process in the condenser fan contactor fault detection method according to any one of the embodiments of the application and achieve the same technical effects. To avoid repetition, details are not described here. The computer readable storage medium can be a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0109] The above is only a specific implementation of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered by the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A condenser fan contactor fault detection method applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, characterized in that, The condenser fan contactor fault detection method comprises: determining whether the condenser fan has a starting requirement at present; after the condenser fan has a starting requirement, outputting a starting control signal to control the contactor of the condenser fan to close; within a preset time after the starting control signal is output, determining whether a contactor feedback signal is received to obtain a determination result; determining whether the contactor has a fault according to the determination result and pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, wherein the determination whether the contactor has a fault according to the determination result and the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system comprises: determining whether the pressure detection data meets a first preset condition; when the determination result is that the contactor feedback signal is not received and the current pressure detection data meets the first preset condition, determining that the contactor has a fault. The first preset condition refers to that the pressure represented by the pressure detection data is outside the normal pressure range. The determination whether the pressure detection data meets the first preset condition comprises:

2. The condenser fan contactor fault detection method of claim 1, wherein, when the determination result is that the contactor feedback signal is not received, determining whether the current pressure detection data meets the first preset condition. Further comprising:

3. The condenser fan contactor fault detection method of claim 1, wherein, after it is determined that the contactor has a fault, controlling the air conditioning system to exit the refrigeration operation mode. Further comprising:

4. The condenser fan contactor fault detection method of claim 1, wherein, after it is determined that the contactor has a fault, reporting contactor fault information. After it is determined that the contactor has a fault, determining whether the fault of the contactor is removed; 5. The condenser fan contactor fault detection method of claim 1, wherein, if yes, entering the step of determining whether the condenser fan has a starting requirement at present. The condenser fan contactor fault detection method comprises:

6. A method for detecting faults in a condenser fan contactor, applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, characterized in that, determining whether the condenser fan has a starting requirement at present; after the condenser fan has a starting requirement, outputting a starting control signal to control the contactor of the condenser fan to close; within a preset time after the starting control signal is output, determining whether a contactor feedback signal is received to obtain a determination result; determining whether the contactor has a fault according to the determination result, pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system and operation time detection data of the air conditioning system, wherein the determination whether the contactor has a fault according to the determination result, the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system and the operation time detection data comprises: determining whether the pressure detection data meets a first preset condition; determining whether the operation time detection data meets a second preset condition; when the determination result is that the contactor feedback signal is not received, if the current pressure detection data meets the first preset condition and the current operation time detection data meets the second preset condition, determining that the contactor has a fault. The first preset condition refers to that the pressure represented by the pressure detection data is outside the normal pressure range. The second preset condition refers to that the operation time detection data is greater than or equal to an operation time threshold. The determination whether the pressure detection data meets the first preset condition comprises: ​ 7. The condenser fan contactor fault detection method of claim 6, wherein, ​ After the output of the starting control signal, and when the running time detection data meets the second preset condition, it is judged whether the pressure detection data meets a first preset condition.

8. The condenser fan contactor fault detection method of claim 6, wherein, The judging whether the running time detection data meets the second preset condition comprises: When the judging result is that the contactor feedback signal is not received, and the current pressure detection data meets the first preset condition, it is judged whether the current running time detection data meets the second preset condition.

9. The condenser fan contactor fault detection method of claim 6, wherein, According to the judging result, the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, and the running time detection data of the air conditioning system, before determining whether the contactor fails, the method further comprises: Timing the running time of the air conditioning system to obtain the running time detection data.

10. The condenser fan contactor fault detection method of claim 6, wherein, The method further comprises: After determining that the contactor fails, controlling the air conditioning system to exit the refrigeration operation mode.

11. The condenser fan contactor fault detection method of claim 6, wherein, The method further comprises: After determining that the contactor fails, reporting contactor failure information.

12. The condenser fan contactor fault detection method of claim 6, wherein, After determining that the contactor fails, judging whether the failure of the contactor is removed; If yes, entering the step of judging whether the condenser fan currently has a starting demand.

13. A condenser fan contactor fault detection device applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, characterized in that, The method comprises: a first judging module, configured to judge whether the condenser fan currently has a starting demand; a starting control module, configured to output a starting control signal to control the contactor of the condenser fan to close after the condenser fan has a starting demand; a second judging module, configured to judge whether a contactor feedback signal is received within a preset time after the output of the starting control signal, to obtain a judging result; a failure determining module, configured to determine whether the contactor fails according to the judging result and the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, wherein the failure determining module judges whether the pressure detection data meets a first preset condition, and determines that the contactor fails when the judging result is that the contactor feedback signal is not received, and the current pressure detection data meets the first preset condition; wherein the first preset condition refers to that the pressure represented by the pressure detection data is outside a normal pressure range.

14. A condenser fan contactor fault detection device for an air conditioning system, the air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, the condenser fan contactor fault detection device comprising: a condenser fan contactor connected to the condenser fan; a condenser fan contactor sensor connected to the condenser fan contactor; a condenser fan contactor controller connected to the condenser fan contactor and the condenser fan contactor sensor; and a condenser fan contactor indicator connected to the condenser fan contactor controller. The method comprises: a first judging module, configured to judge whether the condenser fan currently has a starting demand; a starting control module, configured to output a starting control signal to control the contactor of the condenser fan to close after the condenser fan has a starting demand; a second judging module, configured to judge whether a contactor feedback signal is received within a preset time after the output of the starting control signal, to obtain a judging result; The fault determination module is configured to determine whether the contactor is faulty based on the judgment result, the pressure detection data of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, and the operation time detection data of the air conditioning system. The fault determination module is configured to determine whether the pressure detection data satisfies a first preset condition, and determine whether the operation time detection data satisfies a second preset condition. When the judgment result is that the feedback signal of the contactor is not received, if the current pressure detection data satisfies the first preset condition and the current operation time detection data satisfies the second preset condition, it is determined that the contactor is faulty. In the application, The first preset condition refers to that the pressure represented by the pressure detection data is outside the normal pressure range. The second preset condition refers to that the operation time detection data is greater than or equal to an operation time threshold.

15. A condenser fan contactor fault detection device for an air conditioning system, the air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, the condenser fan contactor fault detection device comprising: a condenser fan contactor connected to the condenser fan; a condenser fan contactor sensor connected to the condenser fan contactor; a condenser fan contactor controller connected to the condenser fan contactor and the condenser fan contactor sensor; and a condenser fan contactor indicator connected to the condenser fan contactor controller. The condenser fan contactor fault detection device comprises a pressure detector and a controller connected to the pressure detector. The pressure detector is configured to detect the pressure of the refrigerant in the high-pressure side refrigerant pipeline of the air conditioning system, obtain the pressure detection data, and send the pressure detection data to the controller. The controller comprises a memory and a processor. The memory stores a computer program executable by the processor. The computer program is executed by the processor to implement the condenser fan contactor fault detection method according to any one of claims 1 to 12.

16. An air conditioning system comprising a compressor, a condenser connected to the compressor, and a condenser fan corresponding to the condenser, characterized by, The application further discloses the condenser fan contactor fault detection device according to claim 15.

17. The air conditioning system of claim 16, wherein, The air conditioning system further comprises an evaporator, an evaporator fan corresponding to the evaporator, a throttling device connected between the evaporator and the condenser, and a high-pressure switch connected between the compressor and the condenser.

18. A vehicle control system characterized by comprising: The application further discloses a vehicle monitoring and maintenance system comprising the condenser fan contactor fault detection device according to claim 15. When the controller determines that the contactor is faulty, the controller reports contactor fault information to the vehicle monitoring and maintenance system. The vehicle monitoring and maintenance system determines whether a contactor fault prompt is needed based on the category of the contactor fault information.

19. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program. The computer program is executed by the processor to implement the condenser fan contactor fault detection method according to any one of claims 1 to 12.

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