Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses an air conditioner and a control method and device thereof, a storage medium and a computer program product.The method comprises the steps that after the air conditioner is started and runs in a heating mode, the absolute moisture content of outdoor air is determined according to the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner; under the condition that it is determined that the pipe temperature of the outdoor heat exchanger is smaller than or equal to 0, the humidity interval to which the absolute moisture content of outdoor air belongs in the preset humidity range is determined, and the air conditioner is controlled to enter a defrosting mode according to at least one of the air suction temperature and the air suction superheat degree of a compressor, the opening degree of a throttling device and the frequency of the compressor; and then the air conditioner is controlled to exit the defrosting mode according to the pipe temperature of the outdoor heat exchanger. According to the scheme, according to the humidity interval to which the absolute moisture content of the outdoor air belongs, the opportunities of entering the defrosting mode and exiting the defrosting mode of the air conditioner are accurately determined in a partitioned mode by combining control over the opening degree of the throttling device and the frequency of the compressor, the defrosting period is prolonged, and the comprehensive energy efficiency and the user experience of the air conditioner are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, an air conditioner, a storage medium, and a computer program product, in particular to an air conditioner defrosting control method and device based on machine learning and heating capacity decay, an air conditioner, a storage medium, and a computer program product. BACKGROUND

[0002] Frosting on the fins of the heat exchanger in the air conditioner is due to the fact that the humid air encounters the fins below zero degrees and the temperature of the fins is lower than the dew point temperature of the cold air, so that the water vapor in the humid air is condensed and cooled into frost at the fins. The outdoor heat exchanger of a water machine (i.e. a water air conditioner or a water-cooled air conditioner) is prone to frosting during the heating operation, and therefore needs to be periodically defrosted, and the heating mode is frequently switched to the defrosting mode, so that the periodic defrosting operation may cause the system to offset the cooling and heating, and reduce the overall energy efficiency of the system.

[0003] The above content is only used to assist in understanding the technical solutions of the present application, and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The present application aims to provide an air conditioner control method and device, an air conditioner, a storage medium, and a computer program product, to solve the problem that the outdoor heat exchanger of the air conditioner is prone to frosting during the heating operation, and needs to be periodically defrosted, but the periodic defrosting operation reduces the overall energy efficiency of the refrigerant system of the air conditioner and affects the user experience, so as to accurately determine the timing of the air conditioner entering and exiting the defrosting mode by dividing zones according to the absolute humidity content of the outdoor air, combining the control of the opening degree of the throttling device and the frequency of the compressor, lengthening the defrosting period, and improving the overall energy efficiency and user experience of the air conditioner.

[0005] The application provides a control method of an air conditioner, wherein an outdoor unit of the air conditioner has a compressor, an outdoor heat exchanger and a throttling device, and an indoor unit of the air conditioner has an indoor heat exchanger; the control method of the air conditioner comprises: acquiring an outdoor dry-bulb temperature of the air conditioner and an outdoor wet-bulb temperature of the air conditioner, acquiring a suction temperature of the compressor and a suction superheat degree of the compressor, acquiring a tube temperature of the outdoor heat exchanger, and acquiring a frequency of the compressor when the air conditioner is started and runs in a heating mode; determining an absolute humidity content of outdoor air of the air conditioner according to the outdoor dry-bulb temperature of the air conditioner and the outdoor wet-bulb temperature of the air conditioner; determining a humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs in a preset humidity range when the tube temperature of the outdoor heat exchanger is determined to be less than or equal to 0; controlling the air conditioner to enter a defrosting mode according to at least one of the suction temperature of the compressor, the suction superheat degree of the compressor, an opening degree of the throttling device and the frequency of the compressor based on the humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs in the preset humidity range; and controlling the air conditioner to exit the defrosting mode according to the tube temperature of the outdoor heat exchanger after the air conditioner is controlled to enter the defrosting mode.

[0006] In some embodiments, the preset humidity range comprises a humidity range composed of a first interval, a second interval and a third interval in which humidity increases sequentially; determining the humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs in the preset humidity range comprises: determining whether the absolute humidity content of outdoor air of the air conditioner is less than or equal to a lower limit of the preset humidity range and determining whether the absolute humidity content of outdoor air of the air conditioner is greater than an upper limit of the preset humidity range; if it is determined that the absolute humidity content of outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, the humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs is determined to be the first interval; if it is determined that the absolute humidity content of outdoor air of the air conditioner is greater than the lower limit of the preset humidity range and less than or equal to the upper limit of the preset humidity range, the humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs is determined to be the second interval; and if it is determined that the absolute humidity content of outdoor air of the air conditioner is greater than the upper limit of the preset humidity range, the humidity interval to which the absolute humidity content of outdoor air of the air conditioner belongs is determined to be the third interval.

[0007] In some embodiments, the preset humidity range comprises a humidity range composed of a first interval, a second interval and a third interval in ascending order of humidity; and the control of the air conditioner into the defrosting mode according to at least one of the suction temperature of the compressor, the suction superheat of the compressor, the opening degree of the throttling device and the frequency of the compressor based on the humidity interval to which the absolute humidity of the outdoor air of the air conditioner belongs in the preset humidity range comprises: if it is determined that the humidity interval to which the absolute humidity of the outdoor air of the air conditioner belongs is the first interval, determining whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold; if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, controlling the air conditioner to continue running in the heating mode; and if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, controlling the air conditioner into the defrosting mode.

[0008] In some embodiments, the preset humidity range comprises a humidity range composed of a first interval, a second interval and a third interval in ascending order of humidity; and the control of the air conditioner into the defrosting mode according to at least one of the suction temperature of the compressor, the suction superheat of the compressor, the opening degree of the throttling device and the frequency of the compressor based on the humidity interval to which the absolute humidity of the outdoor air of the air conditioner belongs in the preset humidity range further comprises: if it is determined that the humidity interval to which the absolute humidity of the outdoor air of the air conditioner belongs is the second interval, determining whether the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value; if it is determined that the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value, controlling the opening degree of the throttling device to increase by a preset opening degree threshold, and then returning to redetermine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; and if it is determined that the suction superheat of the compressor is less than the difference between the preset suction superheat threshold and the preset value, controlling the air conditioner into the defrosting mode according to the suction temperature of the compressor.

[0009] In some embodiments, the control of the air conditioner into the defrosting mode according to the suction temperature of the compressor comprises: determining whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold; if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, controlling the air conditioner to continue running in the heating mode; and if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, controlling the air conditioner into the defrosting mode.

[0010] In some embodiments, the preset humidity range includes: a humidity range consisting of a first interval, a second interval, and a third interval with sequentially increasing humidity; based on the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs within the preset humidity range, and according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency, controlling the air conditioner to enter defrost mode, further includes: if it is determined that the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third interval, then determining whether the frequency of the compressor is greater than or equal to a preset maximum frequency threshold; if it is determined that the frequency of the compressor is greater than or equal to the preset maximum frequency threshold, then limiting the frequency of the compressor to the preset maximum frequency threshold, and then determining the... The system checks whether the compressor's suction superheat is greater than or equal to the difference between a preset suction superheat threshold and a preset value. If the compressor's frequency is determined to be less than a preset maximum frequency threshold, the system directly checks whether the compressor's suction superheat is greater than or equal to the difference between the preset suction superheat threshold and a preset value. If the compressor's suction superheat is determined to be greater than or equal to the difference between the preset suction superheat threshold and a preset value, the system controls the opening of the throttling device to increase by a preset opening threshold, then returns to the previous state to re-determine whether the compressor's suction superheat is greater than or equal to the difference between the preset suction superheat threshold and a preset value. If the compressor's suction superheat is determined to be less than the difference between the preset suction superheat threshold and a preset value, the system controls the air conditioner to enter defrost mode based on the compressor's suction temperature.

[0011] In some implementations, controlling the air conditioner to enter defrost mode based on the compressor's suction temperature includes: determining whether the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and a preset third temperature difference threshold; if the compressor's suction temperature is greater than the difference between the air conditioner's outdoor dry-bulb temperature and the preset third temperature difference threshold, then controlling the air conditioner to continue operating in heating mode; if the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and the preset third temperature difference threshold, then controlling the air conditioner to enter defrost mode.

[0012] In some implementations, after controlling the air conditioner to enter defrost mode, controlling the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger includes: after controlling the air conditioner to enter defrost mode, determining whether the pipe temperature of the outdoor heat exchanger is greater than or equal to a preset pipe temperature threshold; if it is determined that the pipe temperature of the outdoor heat exchanger is less than the preset pipe temperature threshold, then controlling the air conditioner to continue running defrost mode; if it is determined that the pipe temperature of the outdoor heat exchanger is greater than or equal to the preset pipe temperature threshold, then controlling the air conditioner to exit defrost mode.

[0013] In conjunction with the above method, another aspect of the present invention provides a control device for an air conditioner, wherein the outdoor unit of the air conditioner has a compressor, an outdoor heat exchanger, and a throttling device, and the indoor unit of the air conditioner has an indoor heat exchanger; the control device for the air conditioner includes: an acquisition unit configured to acquire, when the air conditioner is turned on and running in heating mode, the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner, the suction temperature and the suction superheat of the compressor, the pipe temperature of the outdoor heat exchanger, and the frequency of the compressor; and a control unit configured to determine the outdoor air temperature of the air conditioner based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. The absolute moisture content; the control unit is further configured to, when determining that the pipe temperature of the outdoor heat exchanger is less than or equal to 0, determine the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs within a preset humidity range; the control unit is further configured to, based on the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs within the preset humidity range, control the air conditioner to enter defrost mode according to at least one of the following: the suction temperature of the compressor, the suction superheat of the compressor, the opening degree of the throttling device, and the frequency of the compressor; the control unit is further configured to, after controlling the air conditioner to enter defrost mode, control the air conditioner to exit defrost mode according to the pipe temperature of the outdoor heat exchanger.

[0014] In some embodiments, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval whose humidity increases sequentially. The control unit determines the humidity interval within the preset humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs, including: determining whether the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, and determining whether the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of the preset humidity range; if it is determined that the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, then the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the first interval; if it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the lower limit of the preset humidity range and less than or equal to the upper limit of the preset humidity range, then the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the second interval; if it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of the preset humidity range, then the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the third interval.

[0015] In some embodiments, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval with sequentially increasing humidity. The control unit, based on the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs within the preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the following: the suction temperature of the compressor, the suction superheat of the compressor, the opening degree of the throttling device, and the frequency of the compressor. This includes: if it is determined that the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is the first interval, then determining whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold; if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then controlling the air conditioner to continue operating in heating mode; if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then controlling the air conditioner to enter defrost mode.

[0016] In some embodiments, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval with sequentially increasing humidity. The control unit, based on the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs within the preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. The control unit further includes: if it is determined that the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is the second interval, then determining the compressor's... The system checks whether the suction superheat is greater than or equal to the difference between a preset suction superheat threshold and a preset value. If the suction superheat of the compressor is determined to be greater than or equal to the difference between the preset suction superheat threshold and the preset value, the opening of the throttling device is increased by the preset opening threshold, and then the process is repeated to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If the suction superheat of the compressor is determined to be less than the difference between the preset suction superheat threshold and the preset value, the air conditioner is controlled to enter defrost mode based on the suction temperature of the compressor.

[0017] In some embodiments, the control unit controls the air conditioner to enter defrost mode based on the compressor's suction temperature, including: determining whether the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and a preset second temperature difference threshold; if the compressor's suction temperature is greater than the difference between the air conditioner's outdoor dry-bulb temperature and the preset second temperature difference threshold, then controlling the air conditioner to continue operating in heating mode; if the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and the preset second temperature difference threshold, then controlling the air conditioner to enter defrost mode.

[0018] In some embodiments, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval with sequentially increasing humidity. The control unit, based on the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs within the preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. The control unit further includes: if it is determined that the humidity interval to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third interval, then determining whether the compressor's frequency is greater than or equal to a preset maximum frequency threshold; if it is determined that the compressor's frequency is greater than or equal to the preset maximum frequency threshold, then limiting the compressor's frequency to the preset maximum frequency threshold, and then... The system determines whether the compressor's suction superheat is greater than or equal to the difference between a preset suction superheat threshold and a preset value. If the compressor's frequency is determined to be less than a preset maximum frequency threshold, the system directly determines whether the compressor's suction superheat is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If the compressor's suction superheat is determined to be greater than or equal to the difference between the preset suction superheat threshold and the preset value, the system controls the opening of the throttling device to increase by a preset opening threshold, and then returns to re-determine whether the compressor's suction superheat is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If the compressor's suction superheat is determined to be less than the difference between the preset suction superheat threshold and the preset value, the system controls the air conditioner to enter defrost mode based on the compressor's suction temperature.

[0019] In some embodiments, the control unit controls the air conditioner to enter defrost mode based on the compressor's suction temperature, including: determining whether the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and a preset third temperature difference threshold; if the compressor's suction temperature is greater than the difference between the air conditioner's outdoor dry-bulb temperature and the preset third temperature difference threshold, then controlling the air conditioner to continue operating in heating mode; if the compressor's suction temperature is less than or equal to the difference between the air conditioner's outdoor dry-bulb temperature and the preset third temperature difference threshold, then controlling the air conditioner to enter defrost mode.

[0020] In some embodiments, after controlling the air conditioner to enter defrost mode, the control unit controls the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger, including: after controlling the air conditioner to enter defrost mode, determining whether the pipe temperature of the outdoor heat exchanger is greater than or equal to a preset pipe temperature threshold; if it is determined that the pipe temperature of the outdoor heat exchanger is less than the preset pipe temperature threshold, then controlling the air conditioner to continue running defrost mode; if it is determined that the pipe temperature of the outdoor heat exchanger is greater than or equal to the preset pipe temperature threshold, then controlling the air conditioner to exit defrost mode.

[0021] In conjunction with the above-described device, the present invention further provides an air conditioner, comprising: the control device for the air conditioner described above.

[0022] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the steps of the air conditioner control method described above.

[0023] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the air conditioner control method described above.

[0024] Therefore, the solution of the present invention addresses the defrosting control logic of an air conditioner (such as a water-cooled air conditioner). Upon receiving a start-up command in heating mode after the air conditioner is powered on, the defrosting control logic is adjusted based on the air conditioner's inlet water temperature (e.g., inlet water temperature T). 水 If the start-up conditions are met (e.g., the inlet water temperature of the air conditioner has not reached the user-set target outlet water temperature), the air conditioner will be turned on and run in heating mode; when the air conditioner is running in heating mode, the outdoor heat exchanger pipe temperature (e.g., the fin temperature T of outdoor heat exchanger 5) will be controlled to ensure the air conditioner is turned on and runs in heating mode. c When the absolute humidity content of outdoor air is less than or equal to 0, determine which of the three humidity ranges (first, second, and third ranges from low to high) the absolute humidity content of outdoor air (e.g., absolute humidity content d) belongs to based on the dry-bulb and wet-bulb temperatures of the outdoor environment; if the absolute humidity content of outdoor air belongs to the first range, then determine the humidity range based on the compressor's suction temperature (e.g., the low-pressure temperature T of compressor 7). l Determine when the air conditioner enters and exits defrost mode; if the outdoor air humidity range is the second range, then control the opening of the throttling device according to the compressor's suction superheat (e.g., suction superheat a of compressor 7), and then according to the compressor's suction temperature (e.g., low-pressure temperature T of compressor 7). l Determine when the air conditioner enters and exits defrost mode; if the outdoor air humidity range is the third range, then after controlling the compressor to reduce its frequency, control the opening of the throttling device according to the compressor's suction superheat (e.g., suction superheat a of compressor 7), and then according to the compressor's suction temperature (e.g., low-pressure temperature T of compressor 7). l This system determines when the air conditioner enters and exits defrost mode. By controlling the opening of the throttling device and the compressor frequency based on the humidity range of the outdoor air's absolute moisture content, the system can accurately determine when the air conditioner enters and exits defrost mode in different zones, thus extending the defrost cycle and improving the overall energy efficiency and user experience of the air conditioner.

[0025] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating an embodiment of the air conditioner control method of the present invention; Figure 2 This is a flowchart illustrating an embodiment of the method of the present invention for determining the humidity range to which the absolute humidity content of the outdoor air of the air conditioner falls within a preset humidity range; Figure 3 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a first interval of a preset humidity range. Figure 4 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a second interval of a preset humidity range. Figure 5 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode according to the suction temperature of the compressor in a second interval of a preset humidity range. Figure 6 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a third interval of a preset humidity range. Figure 7 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode according to the suction temperature of the compressor in a third interval within a preset humidity range. Figure 8 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the air conditioner to exit defrost mode; Figure 9 This is a schematic diagram of the structure of an embodiment of the air conditioner control device of the present invention; Figure 10 A schematic diagram of the system structure of an air conditioner (such as a water-cooled air conditioner); Figure 11 This is a flowchart illustrating an air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation according to the present invention.

[0028] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows: 1-Outlet water temperature sensor; 2-Gas-liquid separator; 3-Indoor heat exchanger; 4-Water pump; 5-Outdoor heat exchanger; 6-Liquid receiver; 7-Compressor; 8-Electronic expansion valve; 9-Finned temperature sensor; 10-Four-way reversing valve; 11-Inlet water temperature sensor; 12-Unit control module; 13-Thermostat; 14-Communication line; 15-Low pressure sensor; 16-Wet and dry bulb pressure sensor; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] Considering that outdoor heat exchangers are prone to frost buildup during air conditioning heating operation, requiring periodic defrosting, but periodic defrosting reduces the overall energy efficiency of the refrigerant system and affects user experience. To reduce accidental defrosting, many researchers use relative humidity as the criterion for initiating defrosting. However, in cold and dry regions, when the temperature is low and the relative humidity reaches 100%, the absolute moisture content is still low, resulting in only a thin layer of frost on the outdoor unit surface and a slow frost formation rate, still leading to "premature defrosting." In contrast, in more humid and milder regions, when the temperature is not very low but the relative humidity reaches 100%, the absolute moisture content is high, resulting in a rapid frost formation rate and causing "delayed defrosting."

[0031] When the outdoor heat exchanger of an air conditioning unit frosts over, the low-pressure side pressure will be low, and the corresponding low-pressure temperature will also be low. Therefore, by adjusting the difference between the outdoor dry-bulb temperature and the low-pressure temperature in stages based on the absolute moisture content, the frost status of the unit can be predicted, and it can be determined whether the unit should enter defrost mode. Therefore, this invention proposes an air conditioning control method, specifically an air conditioning defrost control method based on a combination of machine learning and heating capacity attenuation. By accurately identifying the frost status of the unit through staged adjustment of the absolute moisture content of the outdoor air, intelligently entering defrost mode can prevent situations where there is very little frost on the fins but the unit enters defrost mode.

[0032] Some solutions provide an air conditioner defrosting control method, device, storage medium, and air conditioner. The method includes: after the air conditioner is turned on for heating, determining whether the outdoor heat exchanger of the air conditioner has begun to frost; when it is determined that the outdoor heat exchanger has begun to frost, starting a timer for the frost formation, and obtaining the absolute humidity of the outdoor air after determining that the outdoor heat exchanger has begun to frost; determining whether the air conditioner meets the defrosting conditions based on the absolute humidity of the outdoor air and the frost formation time; and when it is determined that the air conditioner meets the defrosting conditions, controlling the air conditioner to begin defrosting. This solution is applicable to defrosting in regions with different climates, avoiding accidental defrosting. However, this solution has a single and imprecise condition for determining the defrosting status, while the solution of this invention can more intelligently and accurately identify the frost formation status of the unit. Specifically, the solution of this invention, through graded adjustment of the absolute humidity of the outdoor air, allows for different measures to prevent frost formation and different conditions for entering defrosting at different humidity levels, thus enabling more intelligent identification of the frost formation status of the unit.

[0033] The air conditioner described in the present invention is as follows: Figure 10 As shown. Figure 10 This is a schematic diagram of the system structure of an air conditioner (such as a water-cooled air conditioner). Figure 10 The air conditioner shown includes: a water outlet temperature sensor 1, a gas-liquid separator 2, an indoor heat exchanger 3, a water pump 4, an outdoor heat exchanger 5, a liquid receiver 6, a compressor 7, an electronic expansion valve 8, a finned temperature sensor 9, a four-way reversing valve 10, a water inlet temperature sensor 11, a unit control module 12, a thermostat 13, a communication line 14, a low-pressure sensor 15, and a wet-bulb / dry-bulb pressure sensor 16. The indoor heat exchanger 3 has water-side heat exchange piping and refrigerant-side heat exchange piping.

[0034] The compressor 7's exhaust port is connected to the first port of the four-way reversing valve 10; the second port of the four-way reversing valve 10 is connected to the fourth port of the four-way reversing valve 10 after passing through the refrigerant-side heat exchange pipeline in the indoor heat exchanger 3, the electronic expansion valve 8, the liquid receiver 6, and the outdoor heat exchanger 5; the third port of the four-way reversing valve 10 is connected to the suction port of the compressor 7 after passing through the gas-liquid separator 2. An inlet water temperature sensor 11 is installed on the inlet pipe of the water-side heat exchange pipeline in the indoor heat exchanger 3, an outlet water temperature sensor 1 is installed on the outlet pipe of the water-side heat exchange pipeline in the indoor heat exchanger 3, a low-pressure sensor 15 is installed on the pipeline where the compressor 7's suction port is located, and a finned temperature sensor 9 and a wet-bulb / dry-bulb pressure sensor 16 are installed on the outdoor heat exchanger 5. The inlet water temperature sensor 11, the outlet water temperature sensor 1, the low-pressure sensor 15, the finned temperature sensor 9, and the wet-bulb and dry-bulb pressure sensor 16 are all connected to the unit control module 12; the unit control module 12 is connected to the temperature controller 13 via the communication line 14.

[0035] According to embodiments of the present invention, an air conditioning control method is provided, such as... Figure 1The diagram shows a flow chart of an embodiment of the method of the present invention. The outdoor unit of the air conditioner has a compressor, an outdoor heat exchanger, and a throttling device; the indoor unit of the air conditioner has an indoor heat exchanger; the outdoor heat exchanger has fins; and the indoor heat exchanger has water-side heat exchange piping and refrigerant-side heat exchange piping; wherein, the compressor is as follows... Figure 10 The compressor 7 shown, the outdoor heat exchanger as... Figure 10 The outdoor heat exchanger 5 shown has a throttling device as described. Figure 10 The electronic expansion valve 8 shown, the indoor heat exchanger as... Figure 10 The indoor heat exchanger 3 is shown. In the embodiment of the present invention, as... Figure 1 As shown, the air conditioner control method includes steps S110 to S150.

[0036] In step S110, when the air conditioner is turned on and running in heating mode, the outdoor dry-bulb temperature and outdoor wet-bulb temperature of the air conditioner are acquired, the suction temperature and suction superheat of the compressor are acquired, the pipe temperature of the outdoor heat exchanger is acquired, and the frequency of the compressor is acquired. Alternatively, the following can be used: acquiring the outdoor dry-bulb temperature and outdoor wet-bulb temperature of the air conditioner, acquiring the suction temperature and suction superheat of the compressor, acquiring the pipe temperature of the outdoor heat exchanger, acquiring the opening degree of the throttling device, and acquiring the frequency of the compressor. The opening degree of the throttling device is acquired so that in subsequent control of increasing the opening degree of the throttling device, the set opening degree is increased based on the acquired opening degree. Wherein, the outdoor dry-bulb temperature and outdoor wet-bulb temperature of the air conditioner are as follows: Figure 10 The dry-bulb temperature T corresponding to the dry-bulb and wet-bulb pressure sensor 16 on the outdoor heat exchanger 5 shown is... d and wet-bulb temperature T w The suction temperature of the compressor is as follows: Figure 10 The low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of the compressor 7 is located. l The suction superheat of the compressor is as follows: Figure 10 The suction superheat 'a' of compressor 7 shown, and the tube temperature of the outdoor heat exchanger as shown... Figure 10 The outdoor heat exchanger 5 shown above has a fin temperature T detected by the fin sensing bulb 9. c .

[0037] In step S120, the absolute humidity content of the outdoor air is determined based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner; wherein, the absolute humidity content of the outdoor air is determined according to... Figure 5 The dry bulb temperature T on the outdoor heat exchanger 5 shown is... d and wet-bulb temperature Tw Calculate the corresponding absolute humidity d of the outdoor air.

[0038] In step S130, if the tube temperature of the outdoor heat exchanger is determined to be less than or equal to 0, the absolute humidity of the outdoor air of the air conditioner is determined to be within the humidity range of the preset humidity range.

[0039] In step S140, based on the outdoor air absolute humidity content of the air conditioner falling within a preset humidity range, the air conditioner is controlled to enter defrost mode according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. Specifically, the timing for the air conditioner to enter defrost mode is determined based on at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. And when the timing for the air conditioner to enter defrost mode has arrived, the air conditioner is controlled to enter defrost mode.

[0040] In step S150, after controlling the air conditioner to enter defrost mode, the air conditioner is controlled to exit defrost mode based on the pipe temperature of the outdoor heat exchanger. Then, the absolute humidity content of the outdoor air is determined again based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. Specifically, after the air conditioner enters defrost mode, the timing for the air conditioner to exit defrost mode is determined based on the pipe temperature of the outdoor heat exchanger. When the timing for the air conditioner to exit defrost mode has arrived, the air conditioner is controlled to exit defrost mode. Then, the absolute humidity content of the outdoor air is determined again based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner.

[0041] When the outdoor heat exchanger of a generator unit frosts over, it blocks the finned channels, increasing the heat exchanger's thermal resistance and thus reducing the evaporator-side pressure (i.e., the low-pressure side). Consequently, the saturation temperature corresponding to the low-pressure side also decreases. Therefore, the solution of this invention identifies whether the unit has entered defrosting mode based on the difference between the outdoor ambient dry-bulb temperature and the low-pressure temperature. The finned heat exchange channels, i.e., the heat exchange channels between the finned heat exchanger and the air, experience reduced heat exchange when the outdoor heat exchanger frosts over. However, experiments have shown that when the difference between the outdoor ambient dry-bulb temperature and the low-pressure temperature is the same, the frost formation varies under different absolute moisture contents: higher absolute moisture contents result in thicker frost, while lower absolute moisture contents result in less frost. Therefore, the solution of this invention uses the outdoor air absolute moisture content (d) to correlate with the outdoor ambient dry-bulb temperature (T). d The temperature difference between low pressure and high pressure, T lBy implementing tiered adjustments, the frosting status of the unit can be more accurately identified, preventing frequent switching of defrosting modes when the unit has little frosting, reducing unnecessary defrosting operations, and effectively saving unit energy consumption. Simultaneously, the solution of this invention adds anti-frosting measures in medium and high humidity conditions, including: increasing the opening of the electronic expansion valve, frequency limiting, etc. By adjusting these unit parameters, the defrosting cycle is extended to the maximum extent.

[0042] This invention proposes a defrosting control scheme for water-cooled air conditioners based on a combination of machine learning and heating capacity attenuation. By adjusting the difference between the outdoor dry-bulb temperature and the low-pressure temperature according to the absolute moisture content, the frost state of the unit can be predicted, and the entry of the unit into defrosting mode can be determined. The low-pressure temperature T before defrosting is determined when the absolute moisture content is at its lowest. l ≤T d -C min For example, in the judgment, C min It's not a fixed value; it adjusts based on the defrosting time and the defrosting cycle. This intelligent adjustment is achieved through machine learning. By accurately identifying the unit's frost status through tiered adjustment based on the absolute humidity of the outdoor air, it intelligently enters defrosting mode, preventing situations where there is very little frost on the fins but the unit enters defrosting mode anyway. This improves defrosting accuracy, enhances overall system energy efficiency, and improves user experience.

[0043] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0044] The specific process of determining the humidity range within the preset humidity range for the absolute humidity content of the outdoor air in step S130 is illustrated in the following exemplary description.

[0045] The following is combined with Figure 2 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for determining the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs within a preset humidity range. It further illustrates the specific process of determining the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs within the preset humidity range in step S130, including steps S210 to S240.

[0046] Step S210: Determine whether the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of a preset humidity range, and determine whether the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of a preset humidity range; wherein, the lower limit of the preset humidity range is as follows: min The upper limit of the preset humidity range is as follows: d mid .

[0047] Step S220: If it is determined that the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the first range.

[0048] Step S230: If it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the lower limit of the preset humidity range and less than or equal to the upper limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the second range.

[0049] Step S240: If it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the third range.

[0050] Figure 11 This is a flowchart illustrating an air conditioning defrosting control method based on a combination of machine learning and heating capacity attenuation, as per the present invention. The solution of this invention provides a method for accurately predicting the unit's frosting state by adjusting the absolute humidity content (d) of the outdoor air in stages, and taking different measures to reduce the frosting rate and extend the defrosting cycle for different humidity levels. Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention includes: Step 1: When starting the unit, set the heating mode and the user sets the target outlet water temperature T. 出水 Then proceed to step 2.

[0051] Step 2: Read the unit inlet water temperature T 水 The thermostat 13 is based on the inlet water temperature T 水 Determine if the unit start-up conditions are met: If the inlet water temperature T 水 If the start-up conditions are met, proceed to step 3; if the inlet water temperature T 水 If the power-on conditions are not met, return to step 2 and reread the water tank inlet temperature T. 水 This continues until the unit's start-up conditions are met. Step 2 is a pre-start system check, including water temperature (i.e., inlet water temperature T). 水 Once the user's requirements are met, the device will not be turned on, which can reduce power consumption and prevent the temperature sensor from malfunctioning.

[0052] For example: when the inlet water temperature T 水 >Target outlet water temperature T 出水 When the water temperature meets the user's requirements, the unit will not start. Therefore, starting the unit is not required and the start-up conditions are not met. Step 1, starting the unit, refers to the user controlling the air conditioner to start. Step 2, determining whether the unit's start-up conditions are met, refers to the start-up condition judgment procedure executed by the unit after receiving the start-up command. Taking question 1 as an example, when the inlet water temperature T... 水 >Target outlet water temperature T出水 If the unit is not started in step 2, the determination in step 2 will only be performed if the unit is started in step 1.

[0053] Step 3, if the inlet water temperature T 水 If the start-up conditions are met, the temperature controller 13 will start the unit and read the fin temperature T detected by the temperature sensor 9 on the outdoor heat exchanger 5. c Determine the fin temperature T of outdoor heat exchanger 5. c Does the relationship ≤0 hold true: If the fin temperature T of outdoor heat exchanger 5 is... c If the relationship ≤ 0 is not true, it indicates that there is no risk of frost formation on the fins of the outdoor heat exchanger 5 of the unit. The system then returns to the normal operating cycle of the unit, i.e., returns to step 3 to continue reading the fin temperature T. c If the fin temperature T of outdoor heat exchanger 5 c If the relation ≤0 is true, then proceed to step 4 to collect and judge subsequent parameters.

[0054] Step 4: Read the dry bulb temperature T corresponding to the dry bulb and wet bulb pressure sensor 16 on the outdoor heat exchanger 5. d and wet-bulb temperature T w According to the dry bulb temperature T on outdoor heat exchanger 5 d and wet-bulb temperature T w Calculate the corresponding absolute humidity d of the outdoor air, and then proceed to step 5. For example: based on the enthalpy-humidity chart, according to the dry-bulb temperature T... d and wet-bulb temperature T w Determine the location of the air state point on the enthalpy-humidity chart. Based on the air state point and the enthalpy-humidity chart, you can find the absolute moisture content, relative moisture content, enthalpy value, dew point temperature, and other state parameters of the air at this point.

[0055] Step 5: Determine if the absolute humidity of the outdoor air d ≤ d min Does the following relationship hold: If the absolute humidity of outdoor air d ≤ d min If the relationship holds, then execute step 6, using the humidity range to which the absolute humidity of the outdoor air d belongs as the first range; if the absolute humidity of the outdoor air d ≤ d min If the relationship does not hold, then step 7 is executed to implement the control logic that takes the humidity range to which the absolute humidity d of the outdoor air belongs as the second and third ranges.

[0056] Where, d min This refers to the absolute outdoor humidity when the unit is not prone to frost formation. Its value needs to be determined based on the experimental data of the specific unit.

[0057] In steps 1 to 5, the fin temperature T of the outdoor heat exchanger 5 cThe unit with a temperature greater than 0 will definitely not frost over; the fin temperature T of the outdoor heat exchanger 5 is... c Frost may form only on units with ≤0. In this case, subsequent parameter collection and judgment are carried out, the judgment logic is simplified, and energy consumption is reduced.

[0058] In the present invention, the unit status is divided into three types based on the absolute humidity of outdoor air: not easy to frost, relatively easy to frost, and very easy to frost. Different defrosting judgment conditions and anti-frost measures are adopted for different unit statuses, which makes the defrosting logic and anti-frost control more targeted.

[0059] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0060] Step S140, based on the absolute humidity content of the outdoor air in the air conditioner falling within a preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. This includes the process of controlling the air conditioner to enter defrost mode within a first interval of the preset humidity range.

[0061] The following is combined Figure 3 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a first interval of a preset humidity range. It further illustrates the specific process of controlling the air conditioner to enter the defrost mode in the first interval of the preset humidity range in step S140, including steps S310 to S330.

[0062] Step S310: If the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is determined to be the first range, then determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold; wherein, the preset first temperature difference threshold is as follows: C max The preset first temperature difference threshold is the threshold value of the difference between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters the defrosting mode, provided that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the first range.

[0063] Step S320: If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then the air conditioner is controlled to continue running in heating mode, and returns to continue to obtain the suction temperature of the compressor.

[0064] Step S330: If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode. After that, the pipe temperature of the outdoor heat exchanger is acquired, and the frequency of the compressor is acquired to determine when the air conditioner exits the defrosting mode.

[0065] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 5: Step 6: After step 5, if the absolute humidity of the outdoor air d ≤ d min If the relationship holds true, then the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located is read. l Then proceed to step 61. The pressure sensor detects the low-pressure level. The low-pressure level can be output as low-pressure temperature by referring to the refrigerant pressure and evaporation temperature table. The contents of these tables have been entered into the program. After the pressure sensor detects the low-pressure level, it can directly output the low-pressure temperature.

[0066] Step 61: Determine the low-pressure temperature T of compressor 7. l ≤Dry bulb temperature T d -C max Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C max If the relation holds true, then proceed to step 62; if the low-pressure temperature T of compressor 7 is... l ≤Dry bulb temperature T d -C max If the relationship does not hold, return to step 6 and continue reading the low-pressure temperature T corresponding to the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤Dry bulb temperature T d -C max If the relationship does not hold, then return to reading the low-pressure temperature T corresponding to low-pressure sensor 15. l In the logic of.

[0067] Among them, C max This refers to the difference between the ambient temperature and the low-pressure temperature when the absolute humidity of the outdoor air is low and the unit can enter defrosting mode. The value will vary for different units and different refrigerants. In the solution of this invention, it can be temporarily set to 12℃.

[0068] Step 62, if the low-pressure temperature T of compressor 7 l ≤Dry bulb temperature T d -Cmax If the relationship holds true, the unit enters defrosting mode, and then step 63 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0069] Steps 6 to 62 are the defrosting judgment logic for working conditions with low absolute humidity of the air, which can accurately defrost working conditions with low absolute humidity of the air and ensure the defrosting effect.

[0070] The solution of this invention, through graded adjustment of the absolute humidity d of outdoor air, can more accurately predict the frosting state of the unit and more intelligently enter the defrosting mode, preventing the unit from entering the defrosting mode when there is no frost on the fins, thus avoiding defrosting without frost.

[0071] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0072] Step S140, based on the absolute humidity content of the outdoor air in the air conditioner falling within a preset humidity range, and according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency, controls the air conditioner to enter defrost mode. It also includes the process of controlling the air conditioner to enter defrost mode within a second interval of the preset humidity range.

[0073] The following is combined with Figure 4 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a second interval of a preset humidity range. It further illustrates the specific process of controlling the air conditioner to enter the defrost mode in the second interval of the preset humidity range in step S140, including steps S410 to S430.

[0074] Step S410: If it is determined that the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is the second range, then determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; wherein, the preset suction superheat threshold is A, and the preset value is 1℃.

[0075] Step S420: If it is determined that the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value, then the opening degree of the throttling device is increased by a preset opening threshold. The process then returns to the previous step to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; wherein, the preset opening threshold is as follows: K i .

[0076] Step S430: If it is determined that the suction superheat of the compressor is less than the difference between the preset suction superheat threshold and the preset value, then if it is determined that the humidity range to which the absolute humidity of the outdoor air of the air conditioner belongs is the second range, the air conditioner is controlled to enter the defrosting mode according to the suction temperature of the compressor.

[0077] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes, after step 5: Step 7: After step 5, if the absolute humidity of the outdoor air d ≤ d min If the relationship is not valid, then judge d. min Outdoor air absolute humidity d≤d mid Does the relation hold true: If d min Outdoor air absolute humidity d≤d mid If the relation holds, then proceed to step 71; if d min Outdoor air absolute humidity d≤d mid If the relation is not true, proceed to step 8.

[0078] Where, d mid This refers to the absolute outdoor humidity when the unit is more prone to frost formation; its value needs to be determined based on the experimental data of the specific unit.

[0079] Step 71, if d min Outdoor air absolute humidity d≤d mid If the relationship is true, then read the suction superheat a of compressor 7 after the unit stabilizes, and determine whether the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is true: if the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is true, then execute step 72; if the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is not true, then execute step 73.

[0080] Where A is the set intake superheat of the unit, and A-1 is the minimum allowable intake superheat of the unit. The value of A is determined according to the unit's performance and other parameters, and can generally be 1℃ to 3℃.

[0081] Step 72: If the relationship a ≥ A-1 for the suction superheat of compressor 7 holds after the unit stabilizes, then increase the opening of electronic expansion valve 8 by K = K + K. i That is, let the opening degree of the electronic expansion valve 8 be K = K + K i Then, it returns to the logic of reading the suction superheat 'a' after the unit stabilizes, that is, it returns to step 71 to continue reading the suction superheat 'a' of compressor 7 after the unit stabilizes. Taking a point expansion valve with a maximum valve step of 480 as an example, K iThe value ranges from 0 to 40. Machine learning will gradually adjust K based on the current electronic expansion valve step and the changes in system parameters after the electronic expansion valve is adjusted. i Values.

[0082] Step 73: If the relationship between the superheat of compressor 7's suction and the superheat of a ≥ A-1 does not hold after the unit stabilizes, then read the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of compressor 7 is located. l Then proceed to step 74.

[0083] The present invention identifies the possibility of frost formation in the unit by using the absolute humidity d of the outdoor air, and takes measures to increase the opening of the electronic expansion valve when the humidity is moderate, and takes measures to limit the compressor frequency and increase the opening of the electronic expansion valve in combination when the humidity is high, thereby lengthening the defrosting cycle of the unit, avoiding frequent switching from heating mode to defrosting mode, and improving the overall energy efficiency of the system.

[0084] Some solutions adjust the defrosting process by using a timer to connect different branch circuits, and then using a time relay and its associated switch to open or close the solenoid valve. However, the solution of this invention does not adjust defrosting based on time, but rather classifies the defrosting difficulty by absolute moisture content, and then determines whether to initiate defrosting based on low-pressure temperature and the opening degree of the electronic expansion valve.

[0085] In some embodiments, the specific process of controlling the air conditioner to enter the defrost mode based on the compressor's suction temperature when determining that the absolute humidity content of the outdoor air in step S430 belongs to the second range is described in the following exemplary description.

[0086] The following is combined Figure 5 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode according to the suction temperature of the compressor in the second interval of the preset humidity range. The specific process of controlling the air conditioner to enter the defrost mode according to the suction temperature of the compressor in the second interval of the preset humidity range in step S430 is further explained, including steps S510 to S530.

[0087] Step S510: If the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is determined to be the second range, determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold; wherein, the preset second temperature threshold is less than a preset first temperature threshold; the preset second temperature difference threshold is as shown in C. midThe preset second temperature difference threshold is the threshold value of the difference between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters the defrost mode, provided that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the second range.

[0088] Step S520: If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, then the air conditioner is controlled to continue running in heating mode, and returns to continue to obtain the suction temperature of the compressor.

[0089] Step S530: If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode. After that, the pipe temperature of the outdoor heat exchanger is acquired, and the frequency of the compressor is acquired to determine when the air conditioner exits the defrosting mode.

[0090] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 73: Step 74: Determine the low-pressure temperature T of compressor 7 l ≤T d -C mid Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C mid If the relation holds true, then proceed to step 75; if the low-pressure temperature T of compressor 7 is... l ≤T d -C mid If the relationship does not hold, return to step 73 to continue reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤T d -C mid If the relationship does not hold, then return to reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In the logic of.

[0091] Among them, C mid This refers to the difference between the ambient temperature and the low-pressure temperature when the outdoor air humidity is moderate and the unit can enter defrost mode. The value will vary for different units and different refrigerants. In this invention, it can be temporarily set to 10°C.

[0092] Step 75: If the low-pressure temperature T of compressor 7 l ≤Td -C mid If the relationship holds true, the unit enters defrosting mode, and then step 76 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0093] Steps 7 to 75 are extended frosting measures and defrosting entry judgment logic for medium absolute humidity conditions, which can extend the defrosting cycle and accurately defrost for medium absolute humidity conditions, ensuring the defrosting effect.

[0094] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0095] Step S140, based on the absolute humidity content of the outdoor air in the air conditioner falling within a preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency. It also includes the process of controlling the air conditioner to enter defrost mode within a third interval of the preset humidity range.

[0096] The following is combined Figure 6 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode in a third interval of a preset humidity range. It further illustrates the specific process of controlling the air conditioner to enter the defrost mode in the third interval of the preset humidity range in step S140, including steps S610 to S650.

[0097] Step S610: If the humidity range of the absolute moisture content of the outdoor air of the air conditioner is determined to be the third range, then determine whether the frequency of the compressor is greater than or equal to a preset maximum frequency threshold; wherein, the preset maximum frequency threshold is as follows: max The preset maximum frequency threshold is the frequency at which the air conditioner can operate for a longer period of time without easily frosting when the absolute humidity content of the outdoor air is in the third range.

[0098] Step S620: If it is determined that the frequency of the compressor is greater than or equal to a preset maximum frequency threshold, then the frequency of the compressor is limited to the preset maximum frequency threshold. Then, it is determined whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. Wherein, the preset suction superheat threshold is A, and the preset value is 1℃.

[0099] Step S630: If it is determined that the frequency of the compressor is less than the preset maximum frequency threshold, then it is directly determined whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value.

[0100] Step S640: If it is determined that the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value, then the opening degree of the throttling device is increased by a preset opening threshold. The process then returns to the previous step to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; wherein, the preset opening threshold is as follows: K i .

[0101] Step S650: If it is determined that the suction superheat of the compressor is less than the difference between the preset suction superheat threshold and the preset value, then if it is determined that the humidity range to which the absolute humidity of the outdoor air of the air conditioner belongs is the third range, the air conditioner is controlled to enter the defrosting mode according to the suction temperature of the compressor.

[0102] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 7: Step 8: After step 7, if d min Outdoor air absolute humidity d≤d mid If the relationship does not hold, then the absolute humidity of outdoor air d > d mid Does the relationship hold if the absolute humidity of outdoor air d > d mid If the relationship does not hold, return to step 4 to continue reading the dry-bulb temperature T corresponding to the wet-bulb pressure sensor. d and wet-bulb temperature T w That is, returning to the reading of the dry-bulb temperature T corresponding to the wet-bulb pressure sensor. d and wet-bulb temperature T w In the logic; if the absolute humidity of outdoor air d > d mid If the relation holds true, then proceed to step 81.

[0103] Step 81: If the absolute humidity of outdoor air d > d mid If the relationship holds, then read the frequency F of compressor 7 after the unit stabilizes, and determine whether the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F. max Does the following relationship hold: If the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F? max If the relation holds true, then proceed to step 82; if the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F... max If the relation is not true, then proceed to step 83.

[0104] Among them, Fmax The frequency at which the unit can operate for a relatively long time under high humidity conditions without easily frosting varies from unit to unit and needs to be determined based on experimental data. In the scheme of this invention, it can be tentatively set to 60Hz.

[0105] Step 82: If the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F... max If the relationship holds true, then reduce the compressor frequency to F=F max Then proceed to step 83.

[0106] Step 83: Read the suction superheat 'a' of compressor 7 after the unit stabilizes, and then proceed to step 84.

[0107] Step 84: Determine whether the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is valid: If the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is valid, proceed to step 85; if the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is not valid, proceed to step 86.

[0108] Step 85: If the relationship a ≥ A-1 for the suction superheat of compressor 7 holds after the unit stabilizes, then increase the opening of the electronic expansion valve K = K + K i That is, let the opening degree of the electronic expansion valve 8 be K = K + K i Then, return to the logic of reading the suction superheat a after the unit stabilizes, that is, return to step 83 to continue reading the suction superheat a of compressor 7 after the unit stabilizes.

[0109] Step 86: If the relationship between the superheat of the compressor 7's suction and the superheat of the suction of the compressor 7 (a ≥ A-1) does not hold after the unit stabilizes, then read the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of the compressor 7 is located. l Then proceed to step 87.

[0110] In the solution of this invention, the absolute humidity d of outdoor air is used to measure the dry-bulb temperature T of the outdoor environment. d The temperature difference between low pressure and high pressure, T l By implementing tiered adjustments, the frosting status of the unit can be more accurately predicted, preventing phenomena such as "early defrosting" and "delayed defrosting." In this way, by adjusting the absolute humidity of the outdoor air in stages, the preventative measures for frosting and the conditions for entering defrosting will differ at different humidity levels. This allows for more intelligent and precise identification of the unit's frosting status, improving defrosting accuracy, enhancing overall system energy efficiency, and improving the user experience.

[0111] Some solutions determine whether to initiate defrosting based on the air conditioner's heating operation time and the outdoor coil temperature, but lack measures to prevent frost formation. The solution of this invention, however, categorizes defrosting difficulty based on absolute moisture content, and then determines whether to initiate defrosting based on low-pressure temperature and the opening of the electronic expansion valve. Furthermore, it adds anti-frost measures for medium and high humidity conditions.

[0112] In some embodiments, the specific process of controlling the air conditioner to enter the defrost mode based on the compressor's suction temperature when determining that the absolute humidity content of the outdoor air in step S650 belongs to the third humidity range is described in the following exemplary description.

[0113] The following is combined with Figure 7 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the air conditioner to enter the defrost mode according to the suction temperature of the compressor in the third interval of the preset humidity range. The specific process of controlling the air conditioner to enter the defrost mode according to the suction temperature of the compressor in the third interval of the preset humidity range in step S650 is further explained, including steps S710 to S730.

[0114] Step S710: If the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is determined to be the third range, determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset third temperature difference threshold; wherein, the preset third temperature threshold is less than the preset second temperature threshold; the preset third temperature difference threshold is as shown in C. min The preset third temperature difference threshold is the threshold value of the difference between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters the defrost mode, provided that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third range.

[0115] Step S720: If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset third temperature difference threshold, then the air conditioner is controlled to continue running in heating mode, and returns to continue to obtain the suction temperature of the compressor.

[0116] Step S730: If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset third temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode. After that, the pipe temperature of the outdoor heat exchanger is acquired, and the frequency of the compressor is acquired to determine when the air conditioner exits the defrosting mode.

[0117] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 86: Step 87: Determine the low-pressure temperature T of compressor 7. l ≤T d -C min Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C min If the relation holds true, then proceed to step 88; if the low-pressure temperature T of compressor 7 is... l ≤T d -C min If the relationship does not hold, return to step 86 to continue reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤T d -C min If the relationship does not hold, then return to reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In the logic of.

[0118] Among them, C min This refers to the difference between the ambient temperature and the low-pressure temperature when the outdoor air has a high absolute humidity and the unit can enter defrosting mode. The value will vary for different units and different refrigerants. In the solution of this invention, it can be temporarily set to 8°C.

[0119] Step 88: If the low-pressure temperature T of compressor 7 l ≤T d -C min If the relationship holds true, the unit enters defrosting mode, and then step 89 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0120] Steps 8 to 88 are extended frosting measures and defrosting entry / exit judgment logic for working conditions with high absolute humidity of air. They can extend the defrosting cycle and accurately defrost for working conditions with low absolute humidity of air, ensuring the defrosting effect.

[0121] Some solutions determine whether to enter defrost mode based on the air conditioner's heating operation time and the decrease in its heating capacity, but they lack measures to prevent frost formation. The solution of this invention, however, determines whether to enter defrost mode based on absolute moisture content, low-pressure temperature, and the opening of the electronic expansion valve, and also adds anti-frost measures for medium and high humidity conditions.

[0122] In some embodiments, the specific process of controlling the air conditioner to exit the defrost mode after controlling the air conditioner to enter the defrost mode in step S150, based on the pipe temperature of the outdoor heat exchanger, is described in the following exemplary description.

[0123] The following is combined with Figure 8 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for controlling the air conditioner to exit the defrost mode. It further illustrates the specific process of controlling the air conditioner to exit the defrost mode in step S150, including steps S810 to S830.

[0124] Step S810: If the humidity range of the absolute humidity of the outdoor air of the air conditioner is determined to be the first range, the second range, or the third range, after controlling the air conditioner to enter the defrost mode, determine whether the pipe temperature of the outdoor heat exchanger is greater than or equal to a preset pipe temperature threshold; wherein, the preset pipe temperature threshold is as shown in B; the preset pipe temperature threshold is the pipe temperature threshold when the outdoor heat exchanger is defrosted clean.

[0125] Step S820: If it is determined that the pipe temperature of the outdoor heat exchanger is less than the preset pipe temperature threshold, the air conditioner is controlled to continue running the defrosting mode, and then the process returns to continue to obtain the pipe temperature of the outdoor heat exchanger and the frequency of the compressor. Step S830: If it is determined that the pipe temperature of the outdoor heat exchanger is greater than or equal to the preset pipe temperature threshold, then the air conditioner is controlled to exit the defrosting mode, and then the air conditioner is controlled to resume the heating mode and return to continue to obtain the outdoor dry bulb temperature and the outdoor wet bulb temperature of the air conditioner.

[0126] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 62: Step 63: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 64.

[0127] Step 64: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? c If the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 63 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0128] The value of B must be greater than 0, but to ensure thorough defrosting, the value of B can be around 10℃.

[0129] In step 64, if the fin temperature T of the outdoor heat exchanger 5 is [not specified] after the unit enters defrosting modec If the relationship ≥ B does not hold, then return to reading the fin temperature T. c In the logic; if the unit enters defrost mode, the fin temperature T of the outdoor heat exchanger 5... c If the relationship ≥ B holds, then the unit can exit defrosting mode and return to reading the dry-bulb temperature T corresponding to the dry-bulb pressure sensor. d and wet-bulb temperature T w In the logic of.

[0130] Steps 6 to 64 are the defrosting entry and exit judgment logic for the low absolute humidity of the air. It can accurately defrost the air under the condition of low absolute humidity and exit defrosting in time, so as to reduce energy consumption and ensure heating capacity while ensuring defrosting effect.

[0131] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 75: Step 76: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 77.

[0132] Step 77: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? c If the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 76 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0133] In step 77, if the fin temperature T of the outdoor heat exchanger 5 is [not specified] after the unit enters defrosting mode c If the relationship ≥ B does not hold, then return to reading the fin temperature T. c In the logic; if the unit enters defrost mode, the fin temperature T of the outdoor heat exchanger 5... c If the relationship ≥ B holds, then the unit can exit defrosting mode and return to reading the dry-bulb temperature T corresponding to the dry-bulb pressure sensor. d and wet-bulb temperature T w In the logic of.

[0134] Steps 7 to 77 are extended frosting measures and defrosting entry and exit logic for medium absolute humidity conditions. This can extend the defrosting cycle and accurately defrost medium conditions with low absolute humidity, and exit defrosting in time. While ensuring the defrosting effect, it reduces energy consumption and ensures heating capacity.

[0135] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 88: Step 89: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 9.

[0136] Step 9: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? c If the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 89 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0137] Steps 8 to 9 are the extended frosting measures and defrosting entry and exit logic for working conditions with high absolute humidity of air. This can extend the defrosting cycle and accurately defrost for medium working conditions with low absolute humidity of air, and exit defrosting in time. While ensuring the defrosting effect, it reduces energy consumption and ensures heating capacity.

[0138] The solution of this invention has a wide range of applications and can be used for defrosting control in heating operations of units such as residential water chillers and air source heat pumps. The solution includes graded regulation and a criterion for determining graded regulation: grading is based on the outdoor air humidity; the criterion for entering defrosting is determined by the difference between the outdoor dry-bulb temperature and the low-pressure temperature; and anti-frost measures are implemented, such as increasing the opening of the electronic expansion valve and frequency limiting. The solution provided by this invention is applicable to defrosting in regions with different climates, avoiding accidental defrosting. The defrosting control strategy provided by this invention can avoid accidental defrosting and incomplete defrosting in high-humidity areas, saving energy and improving heating efficiency.

[0139] Using the technical solution of this embodiment, through the defrosting control logic for air conditioners (such as water-cooled air conditioners), when the air conditioner receives a start-up command in heating mode after being powered on, the defrosting control logic is applied to the air conditioner's inlet water temperature (e.g., inlet water temperature T). 水If the start-up conditions are met (e.g., the inlet water temperature of the air conditioner has not reached the user-set target outlet water temperature), the air conditioner will be turned on and run in heating mode; when the air conditioner is running in heating mode, the outdoor heat exchanger pipe temperature (e.g., the fin temperature T of outdoor heat exchanger 5) will be controlled to ensure the air conditioner is turned on and runs in heating mode. c When the absolute humidity content of outdoor air is less than or equal to 0, determine which of the three humidity ranges (first, second, and third ranges from low to high) the absolute humidity content of outdoor air (e.g., absolute humidity content d) belongs to based on the dry-bulb and wet-bulb temperatures of the outdoor environment; if the absolute humidity content of outdoor air belongs to the first range, then determine the humidity range based on the compressor's suction temperature (e.g., the low-pressure temperature T of compressor 7). l Determine when the air conditioner enters and exits defrost mode; if the outdoor air humidity range is the second range, then control the opening of the throttling device according to the compressor's suction superheat (e.g., suction superheat a of compressor 7), and then according to the compressor's suction temperature (e.g., low-pressure temperature T of compressor 7). l Determine when the air conditioner enters and exits defrost mode; if the outdoor air humidity range is the third range, then after controlling the compressor to reduce its frequency, control the opening of the throttling device according to the compressor's suction superheat (e.g., suction superheat a of compressor 7), and then according to the compressor's suction temperature (e.g., low-pressure temperature T of compressor 7). l This system determines when the air conditioner enters and exits defrost mode. By controlling the opening of the throttling device and the compressor frequency based on the humidity range of the outdoor air's absolute moisture content, the system can accurately determine when the air conditioner enters and exits defrost mode in different zones, thus extending the defrost cycle and improving the overall energy efficiency and user experience of the air conditioner.

[0140] According to an embodiment of the present invention, an air conditioner control device corresponding to the air conditioner control method is also provided. See also Figure 9 The diagram shows a structural schematic of an embodiment of the device of the present invention. The outdoor unit of the air conditioner includes a compressor, an outdoor heat exchanger, and a throttling device; the indoor unit of the air conditioner includes an indoor heat exchanger; the outdoor heat exchanger has fins; and the indoor heat exchanger has water-side heat exchange piping and refrigerant-side heat exchange piping; wherein, the compressor is as follows... Figure 10 The compressor 7 shown, the outdoor heat exchanger as... Figure 10 The outdoor heat exchanger 5 shown has a throttling device as described. Figure 10 The electronic expansion valve 8 shown, the indoor heat exchanger as... Figure 10 The indoor heat exchanger 3 is shown. In the embodiment of the present invention, as... Figure 9 As shown, the control device of the air conditioner includes: an acquisition unit 102 and a control unit 104.

[0141] The acquisition unit 102 is configured to acquire, when the air conditioner is turned on and running in heating mode, the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner, the suction temperature and the suction superheat of the compressor, the pipe temperature of the outdoor heat exchanger, and the frequency of the compressor; alternatively, it can acquire the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner, the suction temperature and the suction superheat of the compressor, the pipe temperature of the outdoor heat exchanger, the opening degree of the throttling device, and the frequency of the compressor. The opening degree of the throttling device is acquired so that in subsequent control of increasing the opening degree of the throttling device, the set opening degree is increased based on the acquired opening degree. The outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner are as follows: Figure 10 The dry-bulb temperature T corresponding to the dry-bulb and wet-bulb pressure sensor 16 on the outdoor heat exchanger 5 shown is... d and wet-bulb temperature T w The suction temperature of the compressor is as follows: Figure 10 The low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of the compressor 7 is located. l The suction superheat of the compressor is as follows: Figure 10 The suction superheat 'a' of compressor 7 shown, and the tube temperature of the outdoor heat exchanger as shown... Figure 10 The outdoor heat exchanger 5 shown above has a fin temperature T detected by the fin sensing bulb 9. c The specific functions and processing of the acquisition unit 102 are described in step S110.

[0142] The control unit 104 is configured to determine the absolute humidity content of the outdoor air of the air conditioner based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner; wherein, the absolute humidity content of the outdoor air of the air conditioner is determined according to... Figure 5 The dry bulb temperature T on the outdoor heat exchanger 5 shown is... d and wet-bulb temperature T w Calculate the corresponding absolute humidity d of the outdoor air. For the specific functions and processing of this control unit 104, please refer to step S120.

[0143] The control unit 104 is further configured to determine the humidity range within a preset humidity range for the absolute humidity content of the outdoor air when the pipe temperature of the outdoor heat exchanger is less than or equal to 0. The specific functions and processing of this control unit 104 are further described in step S130.

[0144] The control unit 104 is further configured to control the air conditioner to enter defrost mode based on at least one of the following: the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency, according to the humidity range to which the absolute humidity content of the outdoor air falls within a preset humidity range; specifically, it determines the timing for the air conditioner to enter defrost mode based on at least one of the following: the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency; and controls the air conditioner to enter defrost mode when the timing has arrived. The specific functions and processing of this control unit 104 are further described in step S140.

[0145] The control unit 104 is further configured to, after controlling the air conditioner to enter defrost mode, control the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger, and then re-determine the absolute humidity content of the outdoor air based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner; specifically: after the air conditioner enters defrost mode, determine the timing for the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger; and when the timing for the air conditioner to exit defrost mode has arrived, control the air conditioner to exit defrost mode, and then re-determine the absolute humidity content of the outdoor air based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. The specific functions and processing of this control unit 104 are also described in step S150.

[0146] When the outdoor heat exchanger of a generator unit frosts, it blocks the fin channels, increases the thermal resistance of the heat exchanger, and thus reduces the evaporator-side pressure (i.e., the low-pressure side). Consequently, the saturation temperature corresponding to the low-pressure side also decreases. Therefore, the solution of this invention identifies whether the unit has entered defrosting mode based on the difference between the outdoor ambient dry-bulb temperature and the low-pressure temperature. However, experiments have shown that when the difference between the outdoor ambient dry-bulb temperature and the low-pressure temperature is the same, the frosting state differs under different absolute moisture contents: higher absolute moisture contents result in thicker frost, while lower absolute moisture contents result in less frost. Therefore, the solution of this invention uses the outdoor air absolute moisture content d to correlate with the outdoor ambient dry-bulb temperature T. d The temperature difference between low pressure and high pressure, T l By implementing tiered adjustments, the frosting status of the unit can be more accurately identified, preventing frequent switching of defrosting modes when the unit has little frosting, reducing unnecessary defrosting operations, and effectively saving unit energy consumption. Simultaneously, the solution of this invention adds anti-frosting measures in medium and high humidity conditions, including: increasing the opening of the electronic expansion valve, frequency limiting, etc. By adjusting these unit parameters, the defrosting cycle is extended to the maximum extent.

[0147] This invention proposes a defrosting control scheme for water-cooled air conditioners that combines machine learning with heating capacity attenuation. By adjusting the difference between the outdoor dry-bulb temperature and the low-pressure temperature in stages based on absolute humidity, the frost status of the unit can be predicted, and the unit can be determined whether to enter defrosting mode. This method of accurately identifying the frost status of the unit through staged adjustment of the outdoor air's absolute humidity content and intelligently entering defrosting mode prevents situations where there is very little frost on the fins but the unit enters defrosting mode, improving defrosting accuracy, enhancing overall system energy efficiency, and improving user experience.

[0148] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0149] The control unit 104 determines the humidity range within a preset humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs, including: The control unit 104 is further configured to determine whether the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of a preset humidity range, and to determine whether the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of a preset humidity range; wherein, the lower limit of the preset humidity range is as follows: min The upper limit of the preset humidity range is as follows: d mid For details on the specific functions and processing of the control unit 104, please refer to step S210.

[0150] The control unit 104 is further configured to determine the humidity range to which the absolute humidity of the outdoor air of the air conditioner belongs as the first range if it is determined that the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of a preset humidity range. The specific functions and processing of the control unit 104 are further described in step S220.

[0151] The control unit 104 is further configured to determine the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs as the second range if it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the lower limit of a preset humidity range and less than or equal to the upper limit of a preset humidity range. The specific functions and processing of this control unit 104 are further described in step S230.

[0152] The control unit 104 is further configured to, if it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of a preset humidity range, determine that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third range. The specific functions and processing of this control unit 104 are further described in step S240.

[0153] Figure 11This is a flowchart illustrating an air conditioning defrosting control method based on a combination of machine learning and heating capacity attenuation, as per the present invention. The solution of this invention provides a method for accurately predicting the unit's frosting state by adjusting the absolute humidity content (d) of the outdoor air in stages, and taking different measures to reduce the frosting rate and extend the defrosting cycle for different humidity levels. Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention includes: Step 1: When starting the unit, set the heating mode and the user sets the target outlet water temperature T. 出水 Then proceed to step 2.

[0154] Step 2: Read the unit inlet water temperature T 水 The thermostat 13 is based on the inlet water temperature T 水 Determine if the unit start-up conditions are met: If the inlet water temperature T 水 If the start-up conditions are met, proceed to step 3; if the inlet water temperature T 水 If the power-on conditions are not met, return to step 2 and reread the water tank inlet temperature T. 水 This continues until the unit's start-up conditions are met. Step 2 is a pre-start system check, including water temperature (i.e., inlet water temperature T). 水 Once the user's requirements are met, the device will not be turned on, which can reduce power consumption and prevent the temperature sensor from malfunctioning.

[0155] Step 3, if the inlet water temperature T 水 If the start-up conditions are met, the temperature controller 13 will start the unit and read the fin temperature T detected by the temperature sensor 9 on the outdoor heat exchanger 5. c Determine the fin temperature T of outdoor heat exchanger 5. c Does the relationship ≤0 hold true: If the fin temperature T of outdoor heat exchanger 5 is... c If the relationship ≤ 0 is not true, it indicates that there is no risk of frost formation on the fins of the outdoor heat exchanger 5 of the unit. The system then returns to the normal operating cycle of the unit, i.e., returns to step 3 to continue reading the fin temperature T. c If the fin temperature T of outdoor heat exchanger 5 c If the relation ≤0 is true, then proceed to step 4 to collect and judge subsequent parameters.

[0156] Step 4: Read the dry bulb temperature T corresponding to the dry bulb and wet bulb pressure sensor 16 on the outdoor heat exchanger 5. d and wet-bulb temperature T w According to the dry bulb temperature T on outdoor heat exchanger 5 d and wet-bulb temperature T w Calculate the corresponding absolute humidity of outdoor air, d, and then proceed to step 5.

[0157] Step 5: Determine if the absolute humidity of the outdoor air d ≤ dmin Does the following relationship hold: If the absolute humidity of outdoor air d ≤ d min If the relationship holds, then execute step 6, using the humidity range to which the absolute humidity of the outdoor air d belongs as the first range; if the absolute humidity of the outdoor air d ≤ d min If the relationship does not hold, then step 7 is executed to implement the control logic that takes the humidity range to which the absolute humidity d of the outdoor air belongs as the second and third ranges.

[0158] Where, d min This refers to the absolute outdoor humidity when the unit is not prone to frost formation. Its value needs to be determined based on the experimental data of the specific unit.

[0159] In steps 1 to 5, the fin temperature T of the outdoor heat exchanger 5 c The unit with a temperature greater than 0 will definitely not frost over; the fin temperature T of the outdoor heat exchanger 5 is... c Frost may form only on units with ≤0. In this case, subsequent parameter collection and judgment are carried out, the judgment logic is simplified, and energy consumption is reduced.

[0160] In the present invention, the unit status is divided into three types based on the absolute humidity of outdoor air: not easy to frost, relatively easy to frost, and very easy to frost. Different defrosting judgment conditions and anti-frost measures are adopted for different unit statuses, which makes the defrosting logic and anti-frost control more targeted.

[0161] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0162] The control unit 104, based on the outdoor air absolute humidity content falling within a preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the following: compressor suction temperature, compressor suction superheat, throttling device opening degree, and compressor frequency. This includes controlling the air conditioner to enter defrost mode within a first interval of the preset humidity range, as detailed below: The control unit 104 is further configured to, if it is determined that the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is a first range, determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold; wherein, the preset first temperature difference threshold is as follows: C max The preset first temperature difference threshold is the threshold value of the difference between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters defrost mode, provided that the humidity range of the outdoor air absolute moisture content of the air conditioner is within the first range. For the specific functions and processing of this control unit 104, please refer to step S310.

[0163] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold, control the air conditioner to continue operating in heating mode and return to continue acquiring the suction temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S320.

[0164] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset first temperature difference threshold, control the air conditioner to enter defrost mode, and then continue to acquire the pipe temperature of the outdoor heat exchanger and the frequency of the compressor to determine when the air conditioner exits defrost mode. The specific functions and processing of this control unit 104 are further described in step S330.

[0165] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes, after step 5: Step 6: After step 5, if the absolute humidity of the outdoor air d ≤ d min If the relationship holds true, then the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located is read. l Then proceed to step 61.

[0166] Step 61: Determine the low-pressure temperature T of compressor 7. l ≤Dry bulb temperature T d -C max Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C max If the relation holds true, then proceed to step 62; if the low-pressure temperature T of compressor 7 is... l ≤Dry bulb temperature T d -C max If the relationship does not hold, return to step 6 and continue reading the low-pressure temperature T corresponding to the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤Dry bulb temperature T d -C max If the relationship does not hold, then return to reading the low-pressure temperature T corresponding to low-pressure sensor 15. l In the logic of.

[0167] Among them, C maxThis refers to the difference between the ambient temperature and the low-pressure temperature when the absolute humidity of the outdoor air is low and the unit can enter defrosting mode. The value will vary for different units and different refrigerants. In the solution of this invention, it can be temporarily set to 12℃.

[0168] Step 62, if the low-pressure temperature T of compressor 7 l ≤Dry bulb temperature T d -C max If the relationship holds true, the unit enters defrosting mode, and then step 63 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0169] Steps 6 to 62 are the defrosting judgment logic for working conditions with low absolute humidity of the air, which can accurately defrost working conditions with low absolute humidity of the air and ensure the defrosting effect.

[0170] The solution of this invention, through graded adjustment of the absolute humidity d of outdoor air, can more accurately predict the frosting state of the unit and more intelligently enter the defrosting mode, preventing the unit from entering the defrosting mode when there is no frost on the fins, thus avoiding defrosting without frost.

[0171] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0172] The control unit 104, based on the outdoor air absolute humidity content falling within a preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the following: compressor suction temperature, compressor suction superheat, throttling device opening degree, and compressor frequency. The control unit also includes a process of controlling the air conditioner to enter defrost mode within a second preset humidity range, as detailed below: The control unit 104 is further configured to, if it is determined that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the second range, determine whether the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value; wherein, the preset suction superheat threshold is, for example, A, and the preset value is, for example, 1°C. The specific functions and processing of the control unit 104 are further described in step S410.

[0173] The control unit 104 is further configured to, if it is determined that the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value, control the opening degree of the throttling device to increase by a preset opening degree threshold, and then return to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; wherein, the preset opening degree threshold is as follows: K iFor details on the specific functions and processing of the control unit 104, please refer to step S420.

[0174] The control unit 104 is further configured to, if it is determined that the suction superheat of the compressor is less than the difference between a preset suction superheat threshold and a preset value, then, if it is determined that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the second range, control the air conditioner to enter defrost mode based on the suction temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S430.

[0175] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 5: Step 7: After step 5, if the absolute humidity of the outdoor air d ≤ d min If the relationship is not valid, then judge d. min Outdoor air absolute humidity d≤d mid Does the relation hold true: If d min Outdoor air absolute humidity d≤d mid If the relation holds, then proceed to step 71; if d min Outdoor air absolute humidity d≤d mid If the relation is not true, proceed to step 8.

[0176] Where, d mid This refers to the absolute outdoor humidity when the unit is more prone to frost formation; its value needs to be determined based on the experimental data of the specific unit.

[0177] Step 71, if d min Outdoor air absolute humidity d≤d mid If the relationship is true, then read the suction superheat a of compressor 7 after the unit stabilizes, and determine whether the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is true: if the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is true, then execute step 72; if the relationship a≥A-1 of suction superheat a of compressor 7 after the unit stabilizes is not true, then execute step 73.

[0178] Where A is the set intake superheat of the unit, and A-1 is the minimum allowable intake superheat of the unit. The value of A is determined according to the unit's performance and other parameters, and can generally be 1℃ to 3℃.

[0179] Step 72: If the relationship a ≥ A-1 for the suction superheat of compressor 7 holds after the unit stabilizes, then increase the opening of electronic expansion valve 8 by K = K + K. i That is, let the opening degree of the electronic expansion valve 8 be K = K + K iThen, return to the logic of reading the suction superheat a after the unit stabilizes, that is, return to step 71 to continue reading the suction superheat a of compressor 7 after the unit stabilizes.

[0180] Step 73: If the relationship between the superheat of compressor 7's suction and the superheat of a ≥ A-1 does not hold after the unit stabilizes, then read the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of compressor 7 is located. l Then proceed to step 74.

[0181] The present invention identifies the possibility of frost formation in the unit by using the absolute humidity d of the outdoor air, and takes measures to increase the opening of the electronic expansion valve when the humidity is moderate, and takes measures to limit the compressor frequency and increase the opening of the electronic expansion valve in combination when the humidity is high, thereby lengthening the defrosting cycle of the unit, avoiding frequent switching from heating mode to defrosting mode, and improving the overall energy efficiency of the system.

[0182] Some solutions adjust the defrosting process by using a timer to connect different branch circuits, and then using a time relay and its associated switch to open or close the solenoid valve. However, the solution of this invention does not adjust defrosting based on time, but rather classifies the defrosting difficulty by absolute moisture content, and then determines whether to initiate defrosting based on low-pressure temperature and the opening degree of the electronic expansion valve.

[0183] In some embodiments, the control unit 104, upon determining that the humidity range of the outdoor air absolute moisture content of the air conditioner is a second range, controls the air conditioner to enter defrost mode based on the compressor's suction temperature, including: The control unit 104 is further configured to, when determining that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is a second range, determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold; wherein, the preset second temperature threshold is less than a preset first temperature threshold; the preset second temperature difference threshold is as follows: mid The preset second temperature difference threshold is the threshold value of the difference between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters defrost mode, provided that the humidity range of the outdoor air absolute moisture content of the air conditioner is in the second range. For the specific functions and processing of this control unit 104, please refer to step S510.

[0184] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold, control the air conditioner to continue operating in heating mode and return to continue acquiring the suction temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S520.

[0185] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold, control the air conditioner to enter defrost mode, and then continue to acquire the pipe temperature of the outdoor heat exchanger and the frequency of the compressor to determine when the air conditioner exits defrost mode. The specific functions and processing of this control unit 104 are further described in step S530.

[0186] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 73: Step 74: Determine the low-pressure temperature T of compressor 7 l ≤T d -C mid Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C mid If the relation holds true, then proceed to step 75; if the low-pressure temperature T of compressor 7 is... l ≤T d -C mid If the relationship does not hold, return to step 73 to continue reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤T d -C mid If the relationship does not hold, then return to reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In the logic of.

[0187] Among them, C mid This refers to the difference between the ambient temperature and the low-pressure temperature when the outdoor air humidity is moderate and the unit can enter defrost mode. The value will vary for different units and different refrigerants. In this invention, it can be temporarily set to 10°C.

[0188] Step 75: If the low-pressure temperature T of compressor 7 l ≤T d -C mid If the relationship holds true, the unit enters defrosting mode, and then step 76 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0189] Steps 7 to 75 are extended frosting measures and defrosting entry judgment logic for medium absolute humidity conditions, which can extend the defrosting cycle and accurately defrost for medium absolute humidity conditions, ensuring the defrosting effect.

[0190] In some implementations, the preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval where the humidity increases sequentially.

[0191] The control unit 104, based on the outdoor air absolute humidity content falling within a preset humidity range, controls the air conditioner to enter defrost mode according to at least one of the following: compressor suction temperature, compressor suction superheat, throttling device opening degree, and compressor frequency. The control unit also includes a process of controlling the air conditioner to enter defrost mode within a third interval of the preset humidity range, as detailed below: The control unit 104 is further configured to, if it is determined that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third range, then determine whether the frequency of the compressor is greater than or equal to a preset maximum frequency threshold; wherein, the preset maximum frequency threshold is as follows: max The preset maximum frequency threshold is the frequency at which the air conditioner can operate for a longer period of time and is less prone to frost when the absolute humidity content of the outdoor air is in the third humidity range. For the specific functions and processing of this control unit 104, please refer to step S610.

[0192] The control unit 104 is further configured to, if it is determined that the frequency of the compressor is greater than or equal to a preset maximum frequency threshold, limit the frequency of the compressor to the preset maximum frequency threshold, and then determine whether the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value; wherein, the preset suction superheat threshold is, for example, A, and the preset value is, for example, 1°C. The specific functions and processing of this control unit 104 are further described in step S620.

[0193] The control unit 104 is further configured to, if it is determined that the frequency of the compressor is less than a preset maximum frequency threshold, directly determine whether the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value. The specific functions and processing of this control unit 104 are further described in step S630.

[0194] The control unit 104 is further configured to, if it is determined that the suction superheat of the compressor is greater than or equal to the difference between a preset suction superheat threshold and a preset value, control the opening degree of the throttling device to increase by a preset opening degree threshold, and then return to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value; wherein, the preset opening degree threshold is as follows: Ki For details on the specific functions and processing of the control unit 104, please refer to step S640.

[0195] The control unit 104 is further configured to, if it is determined that the suction superheat of the compressor is less than the difference between a preset suction superheat threshold and a preset value, then, if it is determined that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is the third range, control the air conditioner to enter defrost mode based on the suction temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S650.

[0196] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 7: Step 8: After step 7, if d min Outdoor air absolute humidity d≤d mid If the relationship does not hold, then the absolute humidity of outdoor air d > d mid Does the relationship hold if the absolute humidity of outdoor air d > d mid If the relationship does not hold, return to step 4 to continue reading the dry-bulb temperature T corresponding to the wet-bulb pressure sensor. d and wet-bulb temperature T w That is, returning to the reading of the dry-bulb temperature T corresponding to the wet-bulb pressure sensor. d and wet-bulb temperature T w In the logic; if the absolute humidity of outdoor air d > d mid If the relation holds true, then proceed to step 81.

[0197] Step 81: If the absolute humidity of outdoor air d > d mid If the relationship holds, then read the frequency F of compressor 7 after the unit stabilizes, and determine whether the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F. max Does the following relationship hold: If the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F? max If the relation holds true, then proceed to step 82; if the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F... max If the relation is not true, then proceed to step 83.

[0198] Among them, F max The frequency at which the unit can operate for a relatively long time under high humidity conditions without easily frosting varies from unit to unit and needs to be determined based on experimental data. In the scheme of this invention, it can be tentatively set to 60Hz.

[0199] Step 82: If the frequency F of compressor 7 after the unit stabilizes is greater than or equal to F... max If the relationship holds true, then reduce the compressor frequency to F=Fmax Then proceed to step 83.

[0200] Step 83: Read the suction superheat 'a' of compressor 7 after the unit stabilizes, and then proceed to step 84.

[0201] Step 84: Determine whether the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is valid: If the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is valid, proceed to step 85; if the relationship of suction superheat a ≥ A-1 of compressor 7 after the unit stabilizes is not valid, proceed to step 86.

[0202] Step 85: If the relationship a ≥ A-1 for the suction superheat of compressor 7 holds after the unit stabilizes, then increase the opening of the electronic expansion valve K = K + K i That is, let the opening degree of the electronic expansion valve 8 be K = K + K i Then, return to the logic of reading the suction superheat a after the unit stabilizes, that is, return to step 83 to continue reading the suction superheat a of compressor 7 after the unit stabilizes.

[0203] Step 86: If the relationship between the superheat of the compressor 7's suction and the superheat of the suction of the compressor 7 (a ≥ A-1) does not hold after the unit stabilizes, then read the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the suction port of the compressor 7 is located. l Then proceed to step 87.

[0204] In the solution of this invention, the absolute humidity d of outdoor air is used to measure the dry-bulb temperature T of the outdoor environment. d The temperature difference between low pressure and high pressure, T l By implementing tiered adjustments, the frosting status of the unit can be more accurately predicted, preventing phenomena such as "early defrosting" and "delayed defrosting." In this way, by adjusting the absolute humidity of the outdoor air in stages, the preventative measures for frosting and the conditions for entering defrosting will differ at different humidity levels. This allows for more intelligent and precise identification of the unit's frosting status, improving defrosting accuracy, enhancing overall system energy efficiency, and improving the user experience.

[0205] Some solutions determine whether to initiate defrosting based on the air conditioner's heating operation time and the outdoor coil temperature, but lack measures to prevent frost formation. The solution of this invention, however, categorizes defrosting difficulty based on absolute moisture content, and then determines whether to initiate defrosting based on low-pressure temperature and the opening of the electronic expansion valve. Furthermore, it adds anti-frost measures for medium and high humidity conditions.

[0206] In some embodiments, the control unit 104, upon determining that the humidity range of the outdoor air absolute moisture content of the air conditioner is the third range, controls the air conditioner to enter defrost mode based on the compressor's suction temperature, including: The control unit 104 is further configured to, when determining that the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is a third range, determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset third temperature difference threshold; wherein, the preset third temperature threshold is less than a preset second temperature threshold; the preset third temperature difference threshold is as follows: C min The preset third temperature difference threshold is the threshold value between the outdoor dry-bulb temperature of the air conditioner and the suction temperature of the compressor when the air conditioner enters defrost mode, provided that the humidity range of the outdoor air absolute moisture content of the air conditioner is in the third range. For the specific functions and processing of this control unit 104, please refer to step S710.

[0207] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and a preset third temperature difference threshold, control the air conditioner to continue operating in heating mode and return to continue acquiring the suction temperature of the compressor. The specific functions and processing of this control unit 104 are further described in step S720.

[0208] The control unit 104 is further configured to, if it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset third temperature difference threshold, control the air conditioner to enter defrost mode, and then continue to acquire the pipe temperature of the outdoor heat exchanger and the frequency of the compressor to determine when the air conditioner exits defrost mode. The specific functions and processing of this control unit 104 are further described in step S730.

[0209] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 86: Step 87: Determine the low-pressure temperature T of compressor 7. l ≤T d -C min Does the relationship hold true: If the low-pressure temperature T of compressor 7 is... l ≤T d -C min If the relation holds true, then proceed to step 88; if the low-pressure temperature T of compressor 7 is... l ≤T d -C min If the relationship does not hold, return to step 86 to continue reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In other words, if the low-pressure temperature T of compressor 7... l ≤T d -C minIf the relationship does not hold, then return to reading the low-pressure temperature T corresponding to the low-pressure detected by the low-pressure sensor 15 on the pipeline where the compressor 7's suction port is located. l In the logic of.

[0210] Among them, C min This refers to the difference between the ambient temperature and the low-pressure temperature when the outdoor air has a high absolute humidity and the unit can enter defrosting mode. The value will vary for different units and different refrigerants. In the solution of this invention, it can be temporarily set to 8°C.

[0211] Step 88: If the low-pressure temperature T of compressor 7 l ≤T d -C min If the relationship holds true, the unit enters defrosting mode, and then step 89 is executed to read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0212] Steps 8 to 88 are extended frosting measures and defrosting entry / exit judgment logic for working conditions with high absolute humidity of air. They can extend the defrosting cycle and accurately defrost for working conditions with low absolute humidity of air, ensuring the defrosting effect.

[0213] Some solutions determine whether to enter defrost mode based on the air conditioner's heating operation time and the decrease in its heating capacity, but they lack measures to prevent frost formation. The solution of this invention, however, determines whether to enter defrost mode based on absolute moisture content, low-pressure temperature, and the opening of the electronic expansion valve, and also adds anti-frost measures for medium and high humidity conditions.

[0214] In some embodiments, after controlling the air conditioner to enter defrost mode, the control unit 104, based on the pipe temperature of the outdoor heat exchanger, controls the air conditioner to exit defrost mode, including: The control unit 104 is further configured to, when determining that the humidity range to which the absolute humidity content of the outdoor air belongs is a first range, a second range, or a third range, determine whether the pipe temperature of the outdoor heat exchanger is greater than or equal to a preset pipe temperature threshold after controlling the air conditioner to enter defrost mode; wherein, the preset pipe temperature threshold is as shown in B; the preset pipe temperature threshold is the pipe temperature threshold when the outdoor heat exchanger is completely defrosted. The specific functions and processing of this control unit 104 are further described in step S810.

[0215] The control unit 104 is further configured to, if it is determined that the pipe temperature of the outdoor heat exchanger is less than a preset pipe temperature threshold, control the air conditioner to continue operating in defrost mode, and then return to continue acquiring the pipe temperature of the outdoor heat exchanger and the frequency of the compressor. The specific functions and processing of this control unit 104 are further described in step S820.

[0216] The control unit 104 is further configured to, if it is determined that the pipe temperature of the outdoor heat exchanger is greater than or equal to a preset pipe temperature threshold, control the air conditioner to exit the defrost mode, then control the air conditioner to resume the heating mode, and return to continue acquiring the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. The specific functions and processing of this control unit 104 are further described in step S830.

[0217] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following after step 62: Step 63: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 64.

[0218] Step 64: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? c If the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 63 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0219] The value of B must be greater than 0, but to ensure thorough defrosting, the value of B can be around 10℃.

[0220] In step 64, if the fin temperature T of the outdoor heat exchanger 5 is [not specified] after the unit enters defrosting mode c If the relationship ≥ B does not hold, then return to reading the fin temperature T. c In the logic; if the unit enters defrost mode, the fin temperature T of the outdoor heat exchanger 5... c If the relationship ≥ B holds, then the unit can exit defrosting mode and return to reading the dry-bulb temperature T corresponding to the dry-bulb pressure sensor. d and wet-bulb temperature T w In the logic of.

[0221] Steps 6 to 64 are the defrosting entry and exit judgment logic for the low absolute humidity of the air. It can accurately defrost the air under the condition of low absolute humidity and exit defrosting in time, so as to reduce energy consumption and ensure heating capacity while ensuring defrosting effect.

[0222] like Figure 11As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 75: Step 76: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 77.

[0223] Step 77: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? c If the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 76 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0224] In step 77, if the fin temperature T of the outdoor heat exchanger 5 is [not specified] after the unit enters defrosting mode c If the relationship ≥ B does not hold, then return to reading the fin temperature T. c In the logic; if the unit enters defrost mode, the fin temperature T of the outdoor heat exchanger 5... c If the relationship ≥ B holds, then the unit can exit defrosting mode and return to reading the dry-bulb temperature T corresponding to the dry-bulb pressure sensor. d and wet-bulb temperature T w In the logic of.

[0225] Steps 7 to 77 are extended frosting measures and defrosting entry and exit logic for medium absolute humidity conditions. This can extend the defrosting cycle and accurately defrost medium conditions with low absolute humidity, and exit defrosting in time. While ensuring the defrosting effect, it reduces energy consumption and ensures heating capacity.

[0226] like Figure 11 As shown, the air conditioner defrosting control method based on a combination of machine learning and heating capacity attenuation proposed in this invention further includes the following step after step 88: Step 89: Read the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Then proceed to step 9.

[0227] Step 9: Determine the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrost mode. c Does the relationship ≥ B hold true: If the fin temperature T of outdoor heat exchanger 5 is ≥ B after the unit enters defrosting mode? cIf the relationship ≥ B holds, the unit exits defrosting mode and then returns to step 4; if the fin temperature T of the outdoor heat exchanger 5 is [value missing] after the unit enters defrosting mode... c If the relationship ≥ B is not true, return to step 89 to continue reading the fin temperature T of the outdoor heat exchanger 5 after the unit enters defrosting mode. c .

[0228] Steps 8 to 9 are the extended frosting measures and defrosting entry and exit logic for working conditions with high absolute humidity of air. This can extend the defrosting cycle and accurately defrost for medium working conditions with low absolute humidity of air, and exit defrosting in time. While ensuring the defrosting effect, it reduces energy consumption and ensures heating capacity.

[0229] The solution of this invention has a wide range of applications and can be used for defrosting control in heating operations of units such as residential water chillers and air source heat pumps. The solution includes graded regulation and a criterion for determining graded regulation: grading is based on the outdoor air humidity; the criterion for entering defrosting is determined by the difference between the outdoor dry-bulb temperature and the low-pressure temperature; and anti-frost measures are implemented, such as increasing the opening of the electronic expansion valve and frequency limiting. The solution provided by this invention is applicable to defrosting in regions with different climates, avoiding accidental defrosting. The defrosting control strategy provided by this invention can avoid accidental defrosting and incomplete defrosting in high-humidity areas, saving energy and improving heating efficiency.

[0230] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0231] According to an embodiment of the present invention, an air conditioner corresponding to an air conditioner control device is also provided. This air conditioner may include the air conditioner control device described above.

[0232] Since the processing and functions implemented by the air conditioner in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned device, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0233] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner control method is also provided, including a computer program that, when executed by a processor, implements the steps of the air conditioner control method described above.

[0234] Since the processing and functions implemented by the product in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0235] According to an embodiment of the present invention, a storage medium corresponding to an air conditioner control method is also provided, the storage medium including a stored program, wherein, when the program is executed, the device where the storage medium is located controls the execution of the steps of the air conditioner control method described above.

[0236] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0237] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0238] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that, The outdoor unit of the air conditioner has a compressor, an outdoor heat exchanger, and a throttling device, and the indoor unit of the air conditioner has an indoor heat exchanger. The air conditioner control method includes: When the air conditioner is turned on and running in heating mode, the outdoor dry bulb temperature and the outdoor wet bulb temperature of the air conditioner are obtained, the suction temperature and the suction superheat of the compressor are obtained, the pipe temperature of the outdoor heat exchanger is obtained, and the frequency of the compressor is obtained. The absolute humidity content of the outdoor air is determined based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. If the pipe temperature of the outdoor heat exchanger is determined to be less than or equal to 0, the absolute humidity content of the outdoor air of the air conditioner is determined to be within the preset humidity range. Based on the outdoor air absolute humidity content of the air conditioner falling within the preset humidity range, the air conditioner is controlled to enter defrost mode according to at least one of the following: the compressor suction temperature, the compressor suction superheat, the opening degree of the throttling device, and the compressor frequency. After the air conditioner is put into defrost mode, it is controlled to exit defrost mode based on the pipe temperature of the outdoor heat exchanger.

2. The air conditioning control method according to claim 1, characterized in that, The preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval, with humidity increasing sequentially. Determining the humidity range within a preset humidity range for the absolute humidity content of the outdoor air in the air-conditioned environment includes: Determine whether the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, and determine whether the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of the preset humidity range. If it is determined that the absolute humidity content of the outdoor air of the air conditioner is less than or equal to the lower limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the first range. If it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the lower limit of the preset humidity range and less than or equal to the upper limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the second range. If it is determined that the absolute humidity content of the outdoor air of the air conditioner is greater than the upper limit of the preset humidity range, then the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs is determined to be the third range.

3. The air conditioning control method according to claim 1 or 2, characterized in that, The preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval, with humidity increasing sequentially. Based on the outdoor air absolute humidity content falling within a preset humidity range, and according to at least one of the following: compressor suction temperature, compressor suction superheat, throttling device opening degree, and compressor frequency, the air conditioner is controlled to enter defrost mode, including: If the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is determined to be the first range, then it is determined whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry bulb temperature of the air conditioner and the preset first temperature difference threshold. If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then the air conditioner is controlled to continue operating in heating mode. If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset first temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode.

4. The air conditioning control method according to claim 1 or 2, characterized in that, The preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval, with humidity increasing sequentially. Based on the outdoor air absolute humidity content falling within a preset humidity range, and according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency, the air conditioner is controlled to enter defrost mode, further comprising: If the humidity range to which the absolute moisture content of the outdoor air of the air conditioner belongs is determined to be the second range, then it is determined whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If it is determined that the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value, then the opening degree of the throttling device is increased to the preset opening threshold, and then the process is repeated to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If it is determined that the suction superheat of the compressor is less than the difference between the preset suction superheat threshold and the preset value, then the air conditioner is controlled to enter the defrosting mode according to the suction temperature of the compressor.

5. The air conditioning control method according to claim 4, characterized in that, Based on the compressor's suction temperature, the air conditioner is controlled to enter defrost mode, including: Determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset second temperature difference threshold. If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, then the air conditioner is controlled to continue operating in heating mode. If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset second temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode.

6. The air conditioning control method according to claim 1 or 2, characterized in that, The preset humidity range includes a humidity range consisting of a first interval, a second interval, and a third interval, with humidity increasing sequentially. Based on the outdoor air absolute humidity content falling within a preset humidity range, and according to at least one of the compressor's suction temperature, the compressor's suction superheat, the opening degree of the throttling device, and the compressor's frequency, the air conditioner is controlled to enter defrost mode, further comprising: If the humidity range of the absolute humidity of the outdoor air of the air conditioner is determined to be the third range, then determine whether the frequency of the compressor is greater than or equal to the preset highest frequency threshold. If it is determined that the frequency of the compressor is greater than or equal to the preset maximum frequency threshold, then the frequency of the compressor is limited to the preset maximum frequency threshold, and then it is determined whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If it is determined that the frequency of the compressor is less than the preset maximum frequency threshold, then it is directly determined whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If it is determined that the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value, then the opening degree of the throttling device is increased to the preset opening threshold, and then the process is repeated to re-determine whether the suction superheat of the compressor is greater than or equal to the difference between the preset suction superheat threshold and the preset value. If it is determined that the suction superheat of the compressor is less than the difference between the preset suction superheat threshold and the preset value, then the air conditioner is controlled to enter the defrosting mode according to the suction temperature of the compressor.

7. The air conditioning control method according to claim 6, characterized in that, Based on the compressor's suction temperature, the air conditioner is controlled to enter defrost mode, including: Determine whether the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and a preset third temperature difference threshold. If it is determined that the suction temperature of the compressor is greater than the difference between the outdoor dry-bulb temperature of the air conditioner and the preset third temperature difference threshold, then the air conditioner is controlled to continue operating in heating mode. If it is determined that the suction temperature of the compressor is less than or equal to the difference between the outdoor dry-bulb temperature of the air conditioner and the preset third temperature difference threshold, then the air conditioner is controlled to enter the defrosting mode.

8. The air conditioning control method according to any one of claims 1 to 7, characterized in that, After controlling the air conditioner to enter defrost mode, controlling the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger includes: After controlling the air conditioner to enter defrost mode, determine whether the pipe temperature of the outdoor heat exchanger is greater than or equal to the preset pipe temperature threshold. If it is determined that the pipe temperature of the outdoor heat exchanger is less than the preset pipe temperature threshold, then the air conditioner is controlled to continue running in defrost mode. If the pipe temperature of the outdoor heat exchanger is determined to be greater than or equal to a preset pipe temperature threshold, the air conditioner is controlled to exit defrost mode.

9. A control device for an air conditioner, characterized in that, The outdoor unit of the air conditioner includes a compressor, an outdoor heat exchanger, and a throttling device; the indoor unit of the air conditioner includes an indoor heat exchanger; the control device of the air conditioner includes: The acquisition unit is configured to acquire the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner, the suction temperature and the suction superheat of the compressor, the pipe temperature of the outdoor heat exchanger, and the frequency of the compressor when the air conditioner is turned on and running in heating mode. The control unit is configured to determine the absolute humidity of the outdoor air of the air conditioner based on the outdoor dry-bulb temperature and the outdoor wet-bulb temperature of the air conditioner. The control unit is further configured to determine the humidity range to which the absolute humidity of the outdoor air of the air conditioner belongs within a preset humidity range when the pipe temperature of the outdoor heat exchanger is less than or equal to 0. The control unit is further configured to control the air conditioner to enter defrost mode based on at least one of the following: the suction temperature of the compressor, the suction superheat of the compressor, the opening degree of the throttling device, and the frequency of the compressor, according to the humidity range to which the absolute humidity content of the outdoor air of the air conditioner belongs within a preset humidity range. The control unit is further configured to, after controlling the air conditioner to enter defrost mode, control the air conditioner to exit defrost mode based on the pipe temperature of the outdoor heat exchanger.

10. An air conditioner, characterized in that, include: The air conditioner control device as described in claim 9.

11. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the air conditioning control method according to any one of claims 1 to 8.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the air conditioning control method according to any one of claims 1 to 8.

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