Air conditioning unit fault identification method and device, electronic equipment, medium and product

Abstract

The invention provides an air conditioning unit fault identification method and device, electronic equipment, a medium and a product, and relates to the field of air conditioners. The method comprises the steps that the sound frequency band and sound pressure of the air conditioning unit are obtained; when the air conditioning unit is in the running state, in response to the fact that the sound frequency band is located between the third frequency band and the fourth frequency band and the sound pressure is larger than or equal to the sound pressure threshold value, it is determined that the air conditioning unit is in the refrigerant leakage state, and the air conditioning unit is controlled to stop; and when the air conditioning unit is not in the running state, in response to the fact that the sound frequency band is located between the third frequency band and the fourth frequency band and the sound pressure is larger than or equal to the sound pressure threshold value, it is determined that the air conditioning unit is in the refrigerant leakage state, and starting of the air conditioning unit is forbidden.

Description

[0001] This application is a divisional application of the invention patent application filed on October 10, 2025, with application number 202511440710.0 and entitled "Air Conditioning Unit Fault Identification Method, Apparatus, Electronic Equipment, Medium and Product". Technical Field

[0002] This disclosure relates to the field of air conditioning, and more particularly to a method, apparatus, electronic equipment, medium, and product for identifying faults in air conditioning units. Background Technology

[0003] During the operation of an air conditioning system, liquid may be drawn in during air intake. Liquid incompressible refrigerant entering the compressor can directly damage the internal parts of the compressor and cause the compressor motor to overload and burn out. At this time, the system efficiency will decrease and lubrication will fail. If this situation occurs for a long time, it will shorten the life of the air conditioning unit. Summary of the Invention

[0004] One technical problem this disclosure aims to solve is to provide a method, apparatus, electronic device, medium, and product for identifying faults in air conditioning units, which can improve the accuracy and timeliness of fault identification.

[0005] According to one aspect of this disclosure, a method for identifying faults in an air conditioning unit is proposed, comprising: acquiring first acoustic parameters and suction superheat parameters under the operating state of the air conditioning unit, wherein the first acoustic parameters include a first acoustic frequency band; determining that the air conditioning unit is in a suction liquid-carrying fault state in response to the first acoustic frequency band being located between a first frequency band and a second frequency band, and the duration of the first acoustic frequency band being greater than or equal to a time threshold, or the number of occurrences of the first acoustic frequency band being greater than or equal to a number of occurrences threshold within a predetermined time period; and identifying whether the air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameters when the duration is less than the time threshold and the number of occurrences is less than the number of occurrences threshold.

[0006] In some embodiments, in response to a first audio frequency band being less than a first frequency band or greater than a second frequency band, the system identifies whether the air conditioning unit is in a state of liquid carryover during air intake based on the intake superheat parameter, wherein the second frequency band is greater than the first frequency band.

[0007] In some embodiments, identifying whether an air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameter includes: determining that the air conditioning unit is in a suction liquid-carrying fault state in response to the suction superheat parameter being less than a first superheat threshold; and determining that the air conditioning unit is not in a suction liquid-carrying fault state in response to the suction superheat parameter being greater than or equal to the first superheat threshold and less than or equal to a second superheat threshold.

[0008] In some embodiments, identifying whether the air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameter further includes: in response to the suction superheat parameter being greater than a second superheat threshold, determining that the air conditioning unit is not in a suction liquid-carrying fault state, but the energy efficiency of the air conditioning unit is less than the energy efficiency threshold.

[0009] In some embodiments, when the air conditioning unit is in a state of suction liquid failure, the opening of the expansion valve is reduced to make the opening of the expansion valve greater than the opening threshold, and the saturation temperature corresponding to the high-pressure side of the compressor is detected; in response to the saturation temperature being greater than the temperature threshold, the air conditioning unit is controlled to shut down.

[0010] In some embodiments, in response to a first audio frequency band being less than a first frequency band or greater than a second frequency band, and a saturation temperature being less than or equal to a temperature threshold, if the intake superheat parameter is greater than or equal to a first superheat threshold, the first superheat threshold and the second superheat threshold are increased, and the second superheat threshold is greater than the first superheat threshold.

[0011] In some embodiments, in response to the intake superheat parameter being less than a first superheat threshold, the opening of the expansion valve is reduced so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to a second superheat threshold; in response to the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, the opening of the expansion valve is maintained.

[0012] In some embodiments, in response to the intake superheat parameter being greater than a second superheat threshold, the opening of the expansion valve is increased so that the intake superheat parameter is greater than or equal to a first superheat threshold and less than or equal to a second superheat threshold.

[0013] In some embodiments, the first acoustic parameter further includes a first sound pressure level, and the air conditioning unit fault identification method further includes: in response to the first acoustic frequency band being located between the third frequency band and the fourth frequency band, and the first sound pressure level being greater than or equal to the sound pressure threshold, determining that the air conditioning unit is in a refrigerant leakage state.

[0014] In some embodiments, the air conditioning unit is controlled to shut down in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being greater than or equal to the sound pressure threshold; the air conditioning unit is controlled to continue operating in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being less than the sound pressure threshold, or the first audio frequency band being less than the third frequency band or greater than the fourth frequency band.

[0015] In some embodiments, a second acoustic parameter is obtained when the air conditioning unit is not in operation. The second acoustic parameter includes a second acoustic frequency band and a second sound pressure level. In response to the second acoustic frequency band being located between a third frequency band and a fourth frequency band, and the second sound pressure level being greater than or equal to a sound pressure level threshold, it is determined that the air conditioning unit is in a refrigerant leakage state.

[0016] In some embodiments, the air conditioning unit is prohibited from starting when the second audio frequency band is located between the third and fourth frequency bands and the second sound pressure is greater than or equal to the sound pressure threshold; the air conditioning unit is allowed to start when the second audio frequency band is located between the third and fourth frequency bands and the second sound pressure is less than the sound pressure threshold, or when the second audio frequency band is less than the third frequency band or greater than the fourth frequency band.

[0017] According to another aspect of this disclosure, a method for identifying faults in air conditioning units is also proposed, comprising: acquiring the sound frequency band and sound pressure of the air conditioning unit; and determining that the air conditioning unit is in a refrigerant leakage state in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

[0018] In some embodiments, when the air conditioning unit is in operation, the air conditioning unit is controlled to stop in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold; when the air conditioning unit is not in operation, the air conditioning unit is prohibited from starting in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

[0019] In some embodiments, in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band, it is determined that the air conditioning unit is not in a refrigerant leakage state.

[0020] In some embodiments, when the air conditioning unit is in operation, the air conditioning unit is controlled to remain in operation in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band; when the air conditioning unit is not in operation, the air conditioning unit is allowed to start in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band.

[0021] According to another aspect of this disclosure, an air conditioning unit fault identification device is also proposed, comprising: an acquisition module configured to acquire first acoustic parameters and suction superheat parameters under the operating state of the air conditioning unit, the first acoustic parameters including a first acoustic frequency band; and a processing module configured to determine that the air conditioning unit is in a suction liquid-carrying fault state in response to the first acoustic frequency band being located between a first frequency band and a second frequency band, and the duration of the first acoustic frequency band being greater than or equal to a time threshold, or the number of occurrences of the first acoustic frequency band being greater than or equal to a number of occurrences threshold within a predetermined time period; and, if the duration is less than the time threshold and the number of occurrences is less than the number of occurrences threshold, to identify whether the air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameters.

[0022] According to another aspect of this disclosure, an air conditioning unit fault identification device is also proposed, comprising: an acquisition module configured to acquire the sound frequency band and sound pressure of the air conditioning unit; and a processing module configured to determine that the air conditioning unit is in a refrigerant leakage state in response to the sound frequency band being located between a third frequency band and a fourth frequency band and the sound pressure being greater than or equal to a sound pressure threshold.

[0023] According to another aspect of this disclosure, an electronic device is also proposed, comprising: a processor; and a memory coupled to the processor for storing instructions, which, when executed by the processor, cause the processor to perform the air conditioning unit fault identification method as described above.

[0024] According to another aspect of this disclosure, a computer-readable storage medium is also proposed, on which computer instructions are stored, wherein the computer instructions, when executed by a processor, implement the above-described air conditioning unit fault identification method.

[0025] According to another aspect of this disclosure, a computer program product is also proposed, comprising: computer instructions that, when executed by a processor, implement the above-described air conditioning unit fault identification method.

[0026] In this embodiment of the disclosure, the acoustic parameters of the air conditioning unit and the real-time monitored intake superheat parameters are combined to jointly determine whether the air conditioning unit is in a state of intake liquid carrying fault. This can reduce the misjudgment rate of a single parameter. Furthermore, since acoustic parameters are used for judgment, there is no lag in acoustic parameters. Therefore, the real-time performance of fault detection can also be improved.

[0027] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0029] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0030] Figure 1 The following are schematic flowcharts illustrating some embodiments of the air conditioning unit fault identification method disclosed herein;

[0031] Figure 2 This is a flowchart illustrating the determination process for identifying whether an air conditioning unit is in a state of liquid carryover during air intake, as shown in some embodiments of this disclosure.

[0032] Figure 3 The following are schematic flowcharts illustrating other embodiments of the air conditioning unit fault identification method disclosed herein;

[0033] Figure 4This is a flowchart illustrating some further embodiments of the air conditioning unit fault identification method disclosed herein;

[0034] Figure 5 This disclosure provides a process for determining whether an air conditioning unit is in a refrigerant leakage fault state in some embodiments of the present disclosure.

[0035] Figure 6 Schematic diagrams of some embodiments of the air conditioning unit fault identification device disclosed herein;

[0036] Figure 7 This is a schematic diagram of some embodiments of the electronic device disclosed herein. Detailed Implementation

[0037] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0038] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0044] Liquid carryover in the suction line refers to the refrigerant entering the compressor containing liquid refrigerant. In related technologies, relying solely on superheat for judgment of liquid carryover in the suction line is time-consuming and can easily lead to liquid slugging in the compressor. This disclosure provides a fault identification method for air conditioning units, capable of timely and accurate identification of whether the air conditioning unit is in a faulty state. The solution of this disclosure will be described below with reference to the accompanying drawings.

[0045] Figure 1 This is a flowchart illustrating some embodiments of the air conditioning unit fault identification method disclosed herein, which includes steps S11-S12.

[0046] In step S11, the first acoustic parameters and intake superheat parameters of the air conditioning unit under operating conditions are obtained.

[0047] The first acoustic parameter is, for example, the sound frequency band. For instance, an acoustic sensor array can be arranged around the air conditioning unit to detect compressor operating noise, fan and blower noise, refrigerant flow noise in the finned heat exchanger, and vibration and refrigerant leakage noise at pipe joints.

[0048] Analysis of the thermodynamic pressure-enthalpy diagram reveals that after the evaporation process in the heat exchanger ends, insufficient suction superheat can lead to some liquid refrigerant entering the compressor, resulting in liquid carryover in the suction. Therefore, a low-pressure sensor is installed on the compressor's suction side to detect the corresponding saturation temperature, and a temperature sensor, such as a temperature bulb, is installed on the compressor's suction line to detect the system's suction temperature. This allows for the calculation of the suction superheat parameter. For example, the suction superheat parameter = suction temperature - corresponding saturation temperature on the low-pressure side.

[0049] In step S12, based on the first acoustic parameters and the intake superheat parameters, it is determined whether the air conditioning unit is in a state of intake liquid carry-over fault.

[0050] In this embodiment, the acoustic parameters of the air conditioning unit and the real-time monitored intake superheat parameters are combined to jointly determine whether the air conditioning unit is in a state of intake liquid carrying fault. This can reduce the misjudgment rate of a single parameter. Furthermore, since acoustic parameters are used for judgment, there is no lag in acoustic parameters, which can also improve the real-time performance of fault detection.

[0051] In some embodiments of this disclosure, the first acoustic parameter includes a first audio frequency band. Identifying whether the air conditioning unit is in a suction liquid-carrying fault state based on the first acoustic parameter and the suction superheat parameter includes: in response to the first audio frequency band being located between a first frequency band and a second frequency band, determining the duration of the first audio frequency band and the number of occurrences within a predetermined time period; determining that the air conditioning unit is in a suction liquid-carrying fault state if the duration is greater than or equal to a time threshold, or the number of occurrences is greater than or equal to a frequency threshold; and identifying whether the air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameter if the duration is less than the time threshold and the number of occurrences is less than the frequency threshold. The first audio frequency band is the sound frequency band when the air conditioning unit is in operation.

[0052] For example, after the air conditioning unit is turned on, the sound frequency band under normal operation is detected. Then, the expansion valve is adjusted so that the refrigerant entering the compressor contains liquid refrigerant, and the sound frequency band at this time is recorded. This allows us to obtain the acoustic parameter thresholds under the suction liquid-containing state. If the first sound frequency band of the air conditioning unit is greater than or equal to the first frequency band aHz and less than or equal to the second frequency band bHz, and the duration is greater than or equal to the time threshold t1 seconds; or, if the first sound frequency band of the air conditioning unit is greater than or equal to the first frequency band aHz and less than or equal to the second frequency band bHz, and the number of times this frequency band appears within the time period t2 is greater than or equal to the number of occurrences threshold c, then the air conditioning unit is directly determined to be in the suction liquid-containing state.

[0053] If the first audio frequency band of the air conditioning unit is greater than or equal to the first frequency band aHz and less than or equal to the second frequency band bHz, but the duration is less than the time threshold t1 seconds, and the number of times this frequency band appears within the time period t2 is less than the number of times threshold c, then it is impossible to directly determine whether the air conditioning unit is in the state of suction with liquid, and further joint judgment is required based on the suction superheat parameter.

[0054] In this embodiment, the first acoustic parameter of the air conditioning unit is compared with the acoustic parameter when the suction is in a liquid-carrying fault state. If the two match and the duration or number of occurrences meets the predetermined conditions, the air conditioning unit is identified as being in a liquid-carrying state in a timely manner, which facilitates subsequent measures to reduce the impact on the equipment. If the duration or number of occurrences does not meet the predetermined conditions, the suction superheat parameter can be used for joint judgment, which further improves the accuracy of suction liquid-carrying fault judgment.

[0055] In some embodiments, when the air conditioning unit is identified as being in a state of suction liquid entrapment fault by the first acoustic parameter, the opening of the expansion valve is reduced to make the opening of the expansion valve greater than the opening threshold, and the saturation temperature corresponding to the high-pressure side of the compressor is detected; in response to the saturation temperature being greater than the temperature threshold, the air conditioning unit is controlled to shut down.

[0056] When the opening of the expansion valve decreases, a minimum opening threshold needs to be set. If the opening of the expansion valve is less than this threshold, the saturation temperature on the high-pressure side of the compressor will be too high, causing the air conditioning unit to malfunction and trigger protection.

[0057] In this embodiment, reducing the opening of the expansion valve reduces the refrigerant flow into the evaporator, promoting full evaporation of the refrigerant within the evaporator and preventing liquid refrigerant from being carried into the compressor. While closing the expansion valve, the suction superheat parameter and the corresponding saturation temperature on the high-pressure side of the compressor can be continuously monitored. If the saturation temperature exceeds the temperature threshold when the expansion valve is closed to its minimum opening, it indicates excessive refrigerant charge, requiring shutdown to reduce damage to the compressor and extend the service life of the air conditioning unit.

[0058] In other embodiments, when the air conditioning unit is in a state of suction liquid failure, the opening of the expansion valve is reduced and made to be greater than the opening threshold. The saturation temperature corresponding to the high-pressure side of the compressor is detected. In response to the first audio frequency band being less than the first frequency band or greater than the second frequency band, and the saturation temperature being less than or equal to the temperature threshold, if the suction superheat parameter is greater than or equal to the first superheat threshold, the first superheat threshold and the second superheat threshold are increased, and the second superheat threshold is greater than the first superheat threshold.

[0059] For example, if the opening of the expansion valve is reduced so that the sound frequency band of the air conditioning unit is within the sound frequency band threshold range under the condition of no suction liquid fault, and the suction superheat parameter is greater than or equal to the first superheat threshold, the program will automatically record and change the first superheat threshold and the second superheat threshold.

[0060] Because air conditioning units are installed in different locations and outdoor conditions vary, and there are slight differences between each unit, when an abnormality is detected by acoustic parameters, the intake superheat parameter may not be within the default superheat threshold range. Therefore, the superheat threshold is updated to more accurately adjust the opening of the expansion valve next time, thus achieving autonomous learning and improved control.

[0061] In some embodiments, if the duration is less than a time threshold and the number of occurrences is less than a number of occurrences threshold, the air conditioning unit is determined to be in a suction liquid-carrying fault state in response to the suction superheat parameter being less than a first superheat threshold; and the air conditioning unit is determined not to be in a suction liquid-carrying fault state in response to the suction superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold.

[0062] For example, based on extensive experimental data combined with the reliability and energy efficiency of the air conditioning unit, the range of suction superheat thresholds can be determined when the air conditioning unit is not in a suction liquid-carrying fault state. These can be categorized into a first superheat threshold and a second superheat threshold, where the second superheat threshold is greater than the first superheat threshold. If the obtained suction superheat parameter falls within the range of the first and second superheat thresholds, it indicates that the air conditioning unit is not in a suction liquid-carrying fault state. If the obtained suction superheat parameter is less than the first superheat threshold, it indicates that the air conditioning unit is in a suction liquid-carrying fault state. In this embodiment, when the first acoustic parameters cannot directly identify whether the air conditioning unit is in a suction liquid-carrying fault state, further judgment based on the suction superheat parameter can reduce the probability of misjudgment.

[0063] In some embodiments, in response to the suction superheat parameter being greater than a second superheat threshold, it is determined that the air conditioning unit is not in a suction liquid-carrying fault state, but the air conditioning unit's energy efficiency is less than the energy efficiency threshold. In this embodiment, it is possible to identify that the air conditioning unit is not in a suction liquid-carrying fault state, and further, the suction superheat parameter can be used to identify whether the air conditioning unit is in an optimal energy efficiency state, thereby providing a basis for the efficient operation of the air conditioning unit in the future.

[0064] In other embodiments of this disclosure, in response to a first audio frequency band being less than a first frequency band or greater than a second frequency band, the air conditioning unit is identified as being in a suction liquid-carrying fault state based on the suction superheat parameter, wherein the second frequency band is greater than the first frequency band.

[0065] The first and second frequency bands are the frequency band thresholds corresponding to the suction liquid carry-over fault state. If the first acoustic parameter of the air conditioning unit does not fall within the frequency band threshold range corresponding to the suction liquid carry-over fault state, the air conditioning unit can be directly judged from the suction liquid carry-over fault state to reduce the possibility of inaccurate judgment based on a single parameter.

[0066] For example, if the suction superheat parameter is less than a first superheat threshold, the air conditioning unit is determined to be in a suction liquid-carrying fault state; if the suction superheat parameter is greater than or equal to the first superheat threshold and less than or equal to a second superheat threshold, the air conditioning unit is determined not to be in a suction liquid-carrying fault state. When it is impossible to directly identify whether the air conditioning unit is in a suction liquid-carrying fault state based on the first acoustic parameter, further judgment based on the suction superheat parameter can reduce the probability of misjudgment.

[0067] For example, in response to the suction superheat parameter being greater than the second superheat threshold, it is determined that the air conditioning unit is not in a suction liquid-carrying fault state, but the air conditioning unit's energy efficiency is less than the energy efficiency threshold. In this embodiment, it is possible to identify that the air conditioning unit is not in a suction liquid-carrying fault state, and further, the suction superheat parameter can be used to identify whether the air conditioning unit is in the optimal energy efficiency state, thereby providing a basis for the efficient operation of the air conditioning unit in the future.

[0068] In some embodiments, in response to the intake superheat parameter being less than a first superheat threshold, the opening of the expansion valve is reduced so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to a second superheat threshold; in response to the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, the opening of the expansion valve is maintained.

[0069] If the suction superheat parameter is less than the first superheat threshold, it indicates that the air conditioning unit is in a suction liquid-carrying fault state. By adjusting the opening of the expansion valve, the suction superheat parameter is made greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold. At this point, the air conditioning unit is no longer in a suction liquid-carrying fault state, and the opening of the expansion valve is maintained. If the suction superheat parameter is detected from the beginning as greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, it indicates that the air conditioning unit is no longer in a suction liquid-carrying fault state. Therefore, the opening of the expansion valve is maintained, allowing the air conditioning unit to operate normally.

[0070] While reducing the opening of the expansion valve, the saturation temperature corresponding to the high-pressure side of the compressor can be detected to prevent the saturation temperature on the high-pressure side of the compressor from being too high, which could lead to unit failure and protection.

[0071] In some embodiments, in response to the intake superheat parameter being greater than a second superheat threshold, the opening of the expansion valve is increased so that the intake superheat parameter is greater than or equal to a first superheat threshold and less than or equal to a second superheat threshold.

[0072] If the intake superheat parameter is greater than the second superheat threshold, it indicates that the air conditioning unit has low energy efficiency. Therefore, it is necessary to increase the opening of the expansion valve to improve the energy efficiency of the air conditioning unit and put the unit in a high-efficiency state.

[0073] The following will use a specific embodiment as an example to describe how this disclosure identifies whether an air conditioning unit is in a state of liquid carryover during air intake.

[0074] Figure 2 The flowchart below shows the determination process for identifying whether an air conditioning unit is in a state of liquid carry-in during air intake, as described in some embodiments of this disclosure. This embodiment includes steps S21-S233.

[0075] When the unit is in operation, in step S21, the unit's audio frequency band is determined. If the unit's audio frequency band is within the range of the first frequency band aHz to the second frequency band bHz, then step S22 is executed; otherwise, step S23 is executed.

[0076] In step S22, the duration and frequency of occurrence are determined. If the duration of the audio frequency band in the range from aHz in the first frequency band to bHz in the second frequency band is greater than or equal to the time threshold t1s, or the number of occurrences in the predetermined time period t2 is greater than or equal to the number of occurrences threshold c, then step S221 is executed. If the duration of the audio frequency band in the range from aHz in the first frequency band to bHz in the second frequency band is less than the time threshold t1s, and the number of occurrences in the predetermined time period t2 is less than the number of occurrences threshold c, then step S224 is executed.

[0077] In step S221, it is determined that the air conditioning unit is in a state of liquid leakage during air intake.

[0078] In step S222, the opening of the expansion valve is reduced, and the superheat of the unit's suction gas and the corresponding saturation temperature on the high-pressure side of the compressor are detected.

[0079] In step S223, when the expansion valve is opened to the minimum opening j, if the saturation temperature corresponding to the high-pressure side of the compressor is greater than the temperature threshold k, then step S2231 is executed. If the unit's audio frequency band is not within the range of the first frequency band aHz to the second frequency band bHz, and the saturation temperature corresponding to the high-pressure side of the compressor is less than or equal to the temperature threshold k, then step S2232 is executed.

[0080] In step S2231, the air conditioning unit is shut down and an excessive refrigerant fault is output.

[0081] In step S2232, if the intake superheat is greater than or equal to the first superheat threshold h, update the first superheat threshold h and the second superheat threshold i.

[0082] In step S224, if the intake superheat is less than the first superheat threshold h, then step S2241 is executed; if the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i, then step S2242 is executed; if the intake superheat is greater than the second superheat threshold i, then step S2243 is executed.

[0083] In step S2241, the opening of the expansion valve is reduced until the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i. At this time, the opening of the expansion valve is maintained.

[0084] In step S2242, the opening of the expansion valve is maintained.

[0085] In step S2243, the opening of the expansion valve is increased until the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i, at which point the opening of the expansion valve is maintained.

[0086] In step S23, the intake superheat is determined. If the intake superheat is less than the first superheat threshold h, then step S231 is executed. If the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i, then step S232 is executed. If the intake superheat is greater than the second superheat threshold i, then step S233 is executed.

[0087] In step S231, the opening of the expansion valve is reduced until the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i. At this time, the opening of the expansion valve is maintained.

[0088] In step S232, the opening of the expansion valve is maintained.

[0089] In step S233, the opening of the expansion valve is increased until the intake superheat is greater than or equal to the first superheat threshold h and less than or equal to the second superheat threshold i, at which point the opening of the expansion valve is maintained.

[0090] During the process of reducing the opening degree of the expansion valve, the opening degree must always be greater than the opening threshold. This is to prevent the expansion valve opening from being too small, which could lead to excessively high saturation temperatures on the high-pressure side of the compressor, causing unit malfunctions and triggering protection mechanisms. While reducing the expansion valve opening degree, the saturation temperature on the high-pressure side of the compressor can also be monitored. If the saturation temperature on the high-pressure side exceeds the temperature threshold, the compressor should be shut down immediately for protection.

[0091] In the above embodiments, by detecting the acoustic parameters and suction superheat of the air conditioning unit, it is possible to comprehensively determine whether the unit is in a state of suction liquid failure, thereby enabling the early detection of potential faults. By controlling the unit's operating parameters, the lifespan of the unit and compressor can be extended. Furthermore, this solution can also autonomously learn to automatically update the suction superheat threshold, improving the accuracy of subsequent detection.

[0092] Air conditioning units not only pose a risk of refrigerant carryover during air intake, but also risk refrigerant leaks due to pipe damage or poor sealing caused by prolonged use. This can lead to reduced unit capacity, compressor wear, and even safety hazards for users. Most related technologies rely on pressure sensors and leak detectors, which cannot predict early, minute leaks. Furthermore, environmental noise interference and equipment aging can affect the stability of related algorithms, hindering accurate and rapid refrigerant leak detection. The following will combine... Figure 3 Identify refrigerant leaks in air conditioning units.

[0093] Figure 3 This is a flowchart illustrating some other embodiments of the air conditioning unit fault identification method disclosed herein, which includes steps S31-S32.

[0094] In step S31, the first acoustic parameters of the air conditioning unit under operating conditions are obtained. The first acoustic parameters include the first sound frequency band and the first sound pressure level.

[0095] In step S32, in response to the first sound frequency band being located between the third and fourth frequency bands and the first sound pressure being greater than or equal to the sound pressure threshold, it is determined that the air conditioning unit is in a refrigerant leakage state.

[0096] For example, the sound frequency band and sound pressure level of the air conditioning unit under normal conditions, as well as the sound frequency band and sound pressure level during refrigerant leakage, are detected in advance to determine the sound frequency band threshold and sound pressure level threshold during refrigerant leakage. The sound frequency band threshold includes the third and fourth frequency bands. The real-time detected sound frequency band is compared with the sound frequency band threshold, and the real-time detected sound pressure level is compared with the sound threshold. If the sound frequency band is between the third and fourth frequency bands, and the sound pressure level is greater than or equal to the sound pressure level threshold, then the air conditioning unit is determined to be in a refrigerant leakage state. In this embodiment, by comprehensively judging the sound frequency band and sound pressure level, it is possible to quickly identify whether the air conditioning unit is in a refrigerant leakage state, thereby facilitating subsequent measures to reduce the operational risks of the air conditioning unit.

[0097] In some embodiments, the air conditioning unit is controlled to shut down in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being greater than or equal to the sound pressure threshold; the air conditioning unit is controlled to continue operating in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being less than the sound pressure threshold, or the first audio frequency band being less than the third frequency band or greater than the fourth frequency band.

[0098] For example, if the first sound frequency band is between the third and fourth frequency bands, and the first sound pressure level is greater than or equal to the sound pressure threshold, it indicates that the air conditioning unit is in a refrigerant leak state. In this case, the air conditioning unit needs to be shut down to reduce safety hazards. If the first sound frequency band is between the third and fourth frequency bands and the first sound pressure level is less than the sound pressure threshold, or if the first sound frequency band is less than the third frequency band or greater than the fourth frequency band, it indicates that the air conditioning unit is not in a refrigerant leak state and can be kept running.

[0099] In some embodiments, a second acoustic parameter is obtained when the air conditioning unit is not in operation. The second acoustic parameter includes a second acoustic frequency band and a second sound pressure level. In response to the second acoustic frequency band being located between a third frequency band and a fourth frequency band, and the second sound pressure level being greater than or equal to a sound pressure level threshold, it is determined that the air conditioning unit is in a refrigerant leakage state.

[0100] When the air conditioning unit is not running, the sound frequency range and sound pressure can be used to quickly identify whether the air conditioning unit is in a refrigerant leak state, so as to facilitate subsequent measures to reduce the hidden dangers caused by refrigerant leaks.

[0101] For example, in response to the second audio frequency band being located between the third and fourth frequency bands and the second sound pressure level being greater than or equal to the sound pressure threshold, the air conditioning unit is prohibited from starting; in response to the second audio frequency band being located between the third and fourth frequency bands and the second sound pressure level being less than the sound pressure threshold, or the second audio frequency band being less than the third frequency band or greater than the fourth frequency band, the air conditioning unit is allowed to start.

[0102] For example, if the second audio frequency band is between the third and fourth frequency bands, and the second sound pressure level is greater than or equal to the sound pressure threshold, it indicates that the air conditioning unit is in a refrigerant leak state. In this case, the air conditioning unit should not be turned on and should output a refrigerant leak fault to reduce safety hazards. If the second audio frequency band is between the third and fourth frequency bands and the second sound pressure level is less than the sound pressure threshold, or if the second audio frequency band is less than the third frequency band or greater than the fourth frequency band, it indicates that the air conditioning unit is not in a refrigerant leak state and can be turned on normally.

[0103] Figure 4 This is a flowchart illustrating some further embodiments of the air conditioning unit fault identification method disclosed herein, which includes steps S41-S42.

[0104] In step S41, the sound frequency band and sound pressure of the air conditioning unit are obtained.

[0105] For example, an array of sound sensors can detect the sound frequency bands and sound pressure levels when the air conditioning unit is running, as well as when the air conditioning unit is not running.

[0106] In step S42, in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold, it is determined that the air conditioning unit is in a refrigerant leakage state.

[0107] In this embodiment, the air conditioning unit is judged to be in a refrigerant leakage state based on the sound frequency band and sound pressure of the air conditioning unit, so as to facilitate subsequent measures to reduce the operating risk of the air conditioning unit.

[0108] In some embodiments, when the air conditioning unit is in operation, the air conditioning unit is controlled to stop in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold; when the air conditioning unit is not in operation, the air conditioning unit is prohibited from starting in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

[0109] In this embodiment, when the air conditioning unit is in a refrigerant leakage state, if the air conditioning unit is in operation, the air conditioning unit is controlled to stop; if the air conditioning unit is not in operation, the air conditioning unit is prohibited from being turned on, thereby reducing the probability of damage to the air conditioning unit and reducing safety hazards.

[0110] In some embodiments, in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band, it is determined that the air conditioning unit is not in a refrigerant leakage state.

[0111] In this embodiment, even if the sound frequency band of the air conditioning unit is within the refrigerant leakage sound threshold range, but the sound pressure is less than the sound pressure threshold, it is still considered that the air conditioning unit is not in a refrigerant leakage state, thus reducing the possibility of misjudgment. If the sound frequency band is less than the third frequency band or greater than the fourth frequency band, it can be directly determined that the air conditioning unit is not in a refrigerant leakage state.

[0112] When the air conditioning unit is in operation, if the sound frequency band is between the third and fourth frequency bands and the sound pressure is less than the sound pressure threshold, or if the sound frequency band is less than the third frequency band or greater than the fourth frequency band, the air conditioning unit is controlled to remain in operation; when the air conditioning unit is not in operation, if the sound frequency band is between the third and fourth frequency bands and the sound pressure is less than the sound pressure threshold, or if the sound frequency band is less than the third frequency band or greater than the fourth frequency band, the air conditioning unit is allowed to start.

[0113] In this embodiment, the air conditioning unit is not in a refrigerant leakage state. If the air conditioning unit is in operation, it can be kept running. If the air conditioning unit is not in operation, it is allowed to be turned on.

[0114] The identification of refrigerant leakage in this disclosure will be described below using a specific embodiment as an example.

[0115] Figure 5 The present invention provides a process for determining whether an air conditioning unit is in a refrigerant leakage fault state in some embodiments of the present disclosure. This embodiment includes steps S51-S522.

[0116] If the air conditioning unit is running, proceed to step S51; if the air conditioning unit is not running, proceed to step S52.

[0117] In step S51, the sound frequency band of the air conditioning unit is identified. If the sound frequency band is within the range of the third frequency band dHz to the fourth frequency band eHz, then step S511 is executed; otherwise, step S512 is executed.

[0118] In step S511, it is determined whether the sound pressure is greater than or equal to the sound pressure threshold fdB / s. If so, step S5111 is executed; otherwise, step S5112 is executed.

[0119] In step S5111, the air conditioning unit is controlled to stop and a refrigerant leakage fault is output.

[0120] In step S5112, the air conditioning unit is controlled to operate normally.

[0121] In step S512, the air conditioning unit is controlled to operate normally.

[0122] In step S52, the sound frequency band of the air conditioning unit is identified. If the sound frequency band is within the range of the third frequency band dHz to the fourth frequency band eHz, then step S521 is executed; otherwise, step S522 is executed.

[0123] In step S521, it is determined whether the sound pressure is greater than or equal to the sound pressure threshold fdB / s. If so, step S5211 is executed; otherwise, step S5212 is executed.

[0124] In step S5211, the air conditioning unit is prevented from starting and a refrigerant leak fault is output.

[0125] In step S5212, the air conditioning unit is allowed to start normally.

[0126] In step S522, the air conditioning unit is allowed to start normally.

[0127] In the above embodiments, by utilizing the sound frequency band and sound pressure of the air conditioning unit, refrigerant leakage faults of the air conditioning unit can be identified in a timely manner, thereby controlling the operating parameters of the air conditioning unit, reducing the probability of damage to the air conditioning unit, and suppressing the deterioration of the fault.

[0128] The above is an introduction to the fault identification method for air conditioning units. The following section will further explain the fault identification device for air conditioning units with reference to the attached diagram.

[0129] Figure 6 The diagram shows some embodiments of the air conditioning unit fault identification device disclosed herein, which includes an acquisition module 61 and a processing module 62.

[0130] The acquisition module 61 is configured to acquire the first acoustic parameters and the intake superheat parameters of the air conditioning unit under operating conditions.

[0131] The processing module 62 is configured to identify whether the air conditioning unit is in a state of liquid carry-in during intake based on the first acoustic parameters and the intake superheat parameters.

[0132] In this embodiment, the acoustic parameters of the air conditioning unit and the real-time monitored intake superheat parameters are combined to jointly determine whether the air conditioning unit is in a state of intake liquid carrying fault. This can reduce the misjudgment rate of a single parameter. Furthermore, since acoustic parameters are used for judgment, there is no lag in acoustic parameters, which can also improve the real-time performance of fault detection.

[0133] In some embodiments, the first acoustic parameter includes a first audio frequency band. The processing module 62 is configured to, in response to the first audio frequency band being located between a first frequency band and a second frequency band, determine the duration of the first audio frequency band and the number of occurrences within a predetermined time period; if the duration is greater than or equal to a time threshold, or the number of occurrences is greater than or equal to a frequency threshold, determine that the air conditioning unit is in a suction liquid-carrying fault state; if the duration is less than the time threshold and the number of occurrences is less than the frequency threshold, identify whether the air conditioning unit is in a suction liquid-carrying fault state based on the suction superheat parameter.

[0134] In this embodiment, the first acoustic parameter of the air conditioning unit is compared with the acoustic parameter when the suction is in a liquid-carrying fault state. If the two match and the duration or number of occurrences meets the predetermined conditions, the air conditioning unit is identified as being in a liquid-carrying state in a timely manner, which facilitates subsequent measures to reduce the impact on the equipment. If the duration or number of occurrences does not meet the predetermined conditions, the suction superheat parameter can be used for joint judgment, which further improves the accuracy of suction liquid-carrying fault judgment.

[0135] In some embodiments, the processing module 62 is configured to identify whether the air conditioning unit is in a suction liquid fault state based on the suction superheat parameter in response to a first audio frequency band being less than a first frequency band or greater than a second frequency band, wherein the second frequency band is greater than the first frequency band.

[0136] If the first acoustic parameter of the air conditioning unit does not fall within the frequency band threshold range corresponding to the suction liquid fault state, the air conditioning unit can be directly judged from the suction liquid fault state to reduce the possibility of inaccurate judgment based on a single parameter.

[0137] In some embodiments, the processing module 62 is configured to determine that the air conditioning unit is in a suction liquid-carrying fault state in response to the suction superheat parameter being less than a first superheat threshold; and to determine that the air conditioning unit is not in a suction liquid-carrying fault state in response to the suction superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold.

[0138] In this embodiment, when it is impossible to directly identify whether the air conditioning unit is in a state of liquid carry-in during intake based on the first acoustic parameters, further judgment can be made based on the intake superheat parameter, which can reduce the probability of misjudgment.

[0139] In some embodiments, the processing module 62 is configured to determine that the air conditioning unit is not in a suction liquid-carrying fault state, but the air conditioning unit's energy efficiency is less than the energy efficiency threshold, in response to a suction superheat parameter greater than a second superheat threshold. In this embodiment, it is possible to identify that the air conditioning unit is not in a suction liquid-carrying fault state, and further, the suction superheat parameter can be used to identify whether the air conditioning unit is in an optimal energy efficiency state, thereby providing a basis for subsequent improvement.

[0140] In some embodiments, the processing module 62 is further configured to, when the air conditioning unit is in a state of suction liquid failure, reduce the opening of the expansion valve and make the opening of the expansion valve greater than the opening threshold, detect the saturation temperature corresponding to the high-pressure side of the compressor; and control the air conditioning unit to shut down in response to the saturation temperature being greater than the temperature threshold.

[0141] In this embodiment, reducing the opening of the expansion valve decreases the refrigerant flow into the evaporator, promoting full evaporation of the refrigerant within the evaporator and preventing liquid refrigerant from being carried into the compressor. While closing the expansion valve, the suction superheat parameter and the corresponding saturation temperature on the high-pressure side of the compressor can continue to be monitored. If the saturation temperature exceeds the temperature threshold when the expansion valve is closed to its minimum opening, it indicates excessive refrigerant charge, requiring the compressor to be shut down to minimize damage.

[0142] In some embodiments, the processing module 62 is further configured to, in response to a first audio frequency band being less than a first frequency band or greater than a second frequency band, and a saturation temperature being less than or equal to a temperature threshold, increase the first superheat threshold and the second superheat threshold, wherein the second superheat threshold is greater than the first superheat threshold, when the intake superheat parameter is greater than or equal to the first superheat threshold.

[0143] When an abnormality is detected in the air conditioning unit through acoustic parameters, the intake superheat parameter may not be within the default superheat threshold range. Therefore, the superheat threshold is updated to more accurately adjust the opening of the expansion valve next time, thereby achieving autonomous learning and improvement control.

[0144] In some embodiments, the processing module 62 is further configured to reduce the opening of the expansion valve in response to the intake superheat parameter being less than a first superheat threshold, so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to a second superheat threshold; and to maintain the opening of the expansion valve in response to the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold.

[0145] If the suction superheat parameter is less than the first superheat threshold, it indicates that the air conditioning unit is in a suction liquid-carrying fault state. By adjusting the opening of the expansion valve, the suction superheat parameter is made greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold. At this point, the air conditioning unit is no longer in a suction liquid-carrying fault state, and the opening of the expansion valve is maintained. If the suction superheat parameter is detected from the beginning as greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, it indicates that the air conditioning unit is no longer in a suction liquid-carrying fault state. Therefore, the opening of the expansion valve is maintained, allowing the air conditioning unit to operate normally.

[0146] In some embodiments, the processing module 62 is further configured to increase the opening of the expansion valve in response to the intake superheat parameter being greater than the second superheat threshold, so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold.

[0147] If the intake superheat parameter is greater than the second superheat threshold, it indicates that the air conditioning unit has low energy efficiency. Therefore, it is necessary to increase the opening of the expansion valve to improve the energy efficiency of the air conditioning unit and put the unit in a high-efficiency state.

[0148] In some other embodiments of this disclosure, the first acoustic parameters include a first audio frequency band and a first sound pressure level. The processing module 62 is further configured to determine that the air conditioning unit is in a refrigerant leakage state in response to the first audio frequency band being located between a third frequency band and a fourth frequency band and the first sound pressure level being greater than or equal to a sound pressure level threshold.

[0149] In this embodiment, by comprehensively judging the sound frequency band and sound pressure, it is possible to quickly identify whether the air conditioning unit is in a refrigerant leakage state, thereby facilitating subsequent measures to reduce the operating risk of the air conditioning unit.

[0150] In some embodiments, the processing module 62 is further configured to control the air conditioning unit to stop in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being greater than or equal to the sound pressure threshold; and to control the air conditioning unit to continue operating in response to the first audio frequency band being located between the third and fourth frequency bands and the first sound pressure being less than the sound pressure threshold, or the first audio frequency band being less than the third frequency band or greater than the fourth frequency band.

[0151] In some embodiments, the processing module 62 is further configured to acquire a second acoustic parameter when the air conditioning unit is not in operation, the second acoustic parameter including a second acoustic frequency band and a second sound pressure level; in response to the second acoustic frequency band being located between a third frequency band and a fourth frequency band, and the second sound pressure level being greater than or equal to a sound pressure level threshold, it is determined that the air conditioning unit is in a refrigerant leakage state.

[0152] In some embodiments, the processing module 62 is further configured to prohibit the air conditioning unit from starting in response to the second audio frequency band being located between the third and fourth frequency bands and the second sound pressure being greater than or equal to the sound pressure threshold; and to allow the air conditioning unit to start in response to the second audio frequency band being located between the third and fourth frequency bands and the second sound pressure being less than the sound pressure threshold, or the second audio frequency band being less than the third frequency band or greater than the fourth frequency band.

[0153] In some embodiments of this disclosure, the acquisition module 61 is configured to acquire the sound frequency band and sound pressure of the air conditioning unit; the processing module 62 is configured to determine that the air conditioning unit is in a refrigerant leakage state in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

[0154] In this embodiment, the air conditioning unit is judged to be in a refrigerant leakage state based on the sound frequency band and sound pressure of the air conditioning unit, so as to facilitate subsequent measures to reduce the operating risk of the air conditioning unit.

[0155] In some embodiments, the processing module 62 is configured to, when the air conditioning unit is in operation, control the air conditioning unit to stop in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold; and when the air conditioning unit is not in operation, prohibit the air conditioning unit from starting in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

[0156] In some embodiments, the processing module 62 is configured to determine that the air conditioning unit is not in a refrigerant leakage state in response to the acoustic frequency band being between the third frequency band and the fourth frequency band and the sound pressure being less than the sound pressure threshold, or the acoustic frequency band being less than the third frequency band or greater than the fourth frequency band.

[0157] In some embodiments, the processing module 62 is configured to, when the air conditioning unit is in operation, control the air conditioning unit to continue operating in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band; and when the air conditioning unit is not in operation, allow the air conditioning unit to start in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band.

[0158] It should be noted that the above modules are logical modules divided according to their specific functions, and are not used to restrict the specific implementation method. For example, they can be implemented in software, hardware, or a combination of software and hardware. In actual implementation, the above modules can be implemented as independent physical entities, or they can be implemented by a single entity (e.g., a processor (CPU or DSP, etc.), integrated circuit, etc.).

[0159] In some embodiments, the air conditioning unit fault identification method can also be implemented in electronic devices, such as... Figure 7 As shown, Figure 7 This is a schematic diagram of some embodiments of the electronic device disclosed herein. The electronic device 700 includes a memory 710 and a processor 720. The memory 710 may be a disk, flash memory, or any other non-volatile storage medium. The memory 710 is used to store instructions in the above embodiments. The processor 720 is coupled to the memory 710 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 720 is used to execute the instructions stored in the memory.

[0160] In some embodiments, the processor 720 is coupled to the memory 710 via a BUS bus 730. The electronic device 700 can also be connected to an external storage device 750 via a storage interface 740 to access external data, and can also be connected to a network or another computer system (not shown) via a network interface 760, which will not be described in detail here.

[0161] It should be noted that Figure 7 The components of the electronic device 700 shown are merely exemplary and not limiting. The electronic device 700 may have other components as needed for the actual application. The processor 720 can control other components in the electronic device 700 to perform desired functions.

[0162] In this embodiment, data instructions are stored in a memory and then processed by a processor. Through multimodal data fusion, the false positive rate of a single parameter can be reduced and the efficiency of detecting potential faults can be improved.

[0163] In other embodiments, a computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the steps of the methods described above. Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0164] In some embodiments, a computer program product is protected, comprising a computer program or instructions that, when executed by a processor, implement the methods described above. The computer program product includes a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device, or installed from ROM. When the computer program is executed by a CPU, it performs the functions defined in the methods of embodiments of this disclosure.

[0165] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. 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, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0166] 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.

[0167] 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.

[0168] It should be noted that the above modules are logical modules divided according to their specific functions, and are not intended to limit the specific implementation method. For example, they can be implemented in software, hardware, or a combination of both. In actual implementation, the above modules can be implemented as independent physical entities, or they can be implemented by a single entity (e.g., a processor (CPU or DSP, etc.), integrated circuit, etc.). Furthermore, the modules shown in the accompanying drawings with dashed lines indicate that these modules may not actually exist, and the operations / functions they perform can be implemented by the processing circuitry itself.

[0169] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0170] The methods and apparatus of this disclosure may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, this disclosure may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this disclosure. Thus, this disclosure also covers recording media storing programs for performing the methods according to this disclosure.

[0171] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A method for fault identification of an air conditioning unit, characterized in that, include: Acquire the sound frequency band and sound pressure level of the air conditioning unit; When the air conditioning unit is in operation, in response to the sound frequency band being between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold, it is determined that the air conditioning unit is in a refrigerant leakage state, and the air conditioning unit is controlled to shut down. When the air conditioning unit is not in operation, in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold, it is determined that the air conditioning unit is in a refrigerant leakage state, and the air conditioning unit is prohibited from being turned on.

2. The air conditioning unit fault identification method according to claim 1, characterized in that, Also includes: In response to the sound frequency band being located between the third frequency band and the fourth frequency band and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band, it is determined that the air conditioning unit is not in a refrigerant leakage state.

3. The air conditioning unit fault identification method according to claim 1 or 2, characterized in that, Also includes: When the air conditioning unit is in operation, in response to the sound frequency band being between the third frequency band and the fourth frequency band and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band, the air conditioning unit is controlled to continue operating. When the air conditioning unit is not in operation, in response to the sound frequency band being between the third frequency band and the fourth frequency band and the sound pressure being less than the sound pressure threshold, or the sound frequency band being less than the third frequency band or greater than the fourth frequency band, the air conditioning unit is allowed to be turned on.

4. The air conditioning unit fault identification method according to claim 1, characterized in that, Also includes: Obtain the intake superheat of the air conditioning unit under operating conditions; When the air conditioning unit is in operation, in response to the sound frequency band being located between the first frequency band and the second frequency band, the duration of the sound frequency band and the number of times it occurs within a predetermined time period are determined; If the duration is greater than or equal to a time threshold, or the number of occurrences is greater than or equal to a number threshold, the air conditioning unit is determined to be in a state of liquid intake failure. If the duration is less than the time threshold and the number of occurrences is less than the number of occurrences threshold, in response to the intake superheat parameter being less than the first superheat threshold, it is determined that the air conditioning unit is in an intake liquid-carrying fault state. In response to the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, it is determined that the air conditioning unit is not in an intake liquid-carrying fault state. In response to the intake superheat parameter being greater than the second superheat threshold, it is determined that the air conditioning unit is not in an intake liquid-carrying fault state, but the energy efficiency of the air conditioning unit is less than the energy efficiency threshold.

5. The air conditioning unit fault identification method according to claim 1, characterized in that, Also includes: Obtain the intake superheat of the air conditioning unit under operating conditions; When the air conditioning unit is in operation, if the sound frequency band is lower than the first frequency band or higher than the second frequency band, and the intake superheat parameter is lower than the first superheat threshold, it is determined that the air conditioning unit is in a state of intake liquid carry-over fault. In response to the sound frequency band being less than the first frequency band or greater than the second frequency band, and the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, it is determined that the air conditioning unit is not in a state of intake liquid carryover fault.

6. The air conditioning unit fault identification method according to claim 4 or 5, characterized in that, Also includes: In response to the intake superheat parameter being less than the first superheat threshold, the opening of the expansion valve is reduced so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold. In response to the intake superheat parameter being greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold, the opening of the expansion valve is maintained.

7. The air conditioning unit fault identification method according to claim 4 or 5, characterized in that, Also includes: In response to the intake superheat parameter being greater than the second superheat threshold, the opening of the expansion valve is increased so that the intake superheat parameter is greater than or equal to the first superheat threshold and less than or equal to the second superheat threshold.

8. A fault identification device for an air conditioning unit, characterized in that, include: The acquisition module is configured to acquire the sound frequency band and sound pressure level of the air conditioning unit. The processing module is configured to determine that the air conditioning unit is in a refrigerant leakage state in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold. Specifically, when the air conditioning unit is in operation, the module controls the air conditioning unit to stop in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold. When the air conditioning unit is not in operation, the module prohibits the air conditioning unit from starting in response to the sound frequency band being located between the third and fourth frequency bands and the sound pressure being greater than or equal to the sound pressure threshold.

9. An electronic device, characterized in that, include: processor; as well as A memory coupled to the processor is used to store instructions that, when executed by the processor, cause the processor to perform the air conditioning unit fault identification method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the computer instruction is executed by the processor, it implements the air conditioning unit fault identification method according to any one of claims 1 to 7.

11. A computer program product, characterized in that, include: It includes computer instructions, which, when executed by a processor, implement the air conditioning unit fault identification method according to any one of claims 1 to 7.

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