Control Method, Device and Air Conditioning Unit of an Air Conditioning Unit

Abstract

The present application relates to a control method, device and air conditioner unit. The outdoor unit in the air conditioner unit includes a plurality of compressors connected in parallel. The method includes: obtaining the exhaust temperature of each compressor in the air conditioner unit; determining the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors; when the refrigerant distribution result is uneven refrigerant distribution, determining the target type corresponding to each compressor according to the exhaust temperatures of all compressors, where the target type is used to characterize the refrigerant quantity situation in the compressor; for each compressor, determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; and controlling the air conditioner unit according to the target control strategy. The present application solves the problem of uneven refrigerant distribution, thereby improving the operation reliability of the air conditioner unit and extending the service life of the air conditioner unit.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly to a control method, device and air conditioner unit for an air conditioner unit. Background Art

[0002] When the required cooling capacity or heating capacity varies within a large range, multiple compressors connected in parallel can be arranged in the outdoor unit of the air conditioner unit to improve the working performance of the air conditioner unit, reduce the shutdown times of a single compressor, and extend the service life of the compressor. However, during the operation of multiple compressors connected in parallel, when the refrigerant distribution among the compressors is uneven, problems such as overheating and liquid slugging of the compressors will occur, thereby affecting the operation reliability and service life of the air conditioner unit. Summary of the Invention

[0003] In view of this, to solve the technical problem that the operation reliability and service life of the air conditioner unit are affected due to uneven refrigerant distribution among multiple compressors connected in parallel during operation, embodiments of the present application provide a control method, device and air conditioner unit for an air conditioner unit.

[0004] In a first aspect, an embodiment of the present application provides a control method for an air conditioner unit. The outdoor unit in the air conditioner unit includes multiple compressors connected in parallel. The method includes:

[0005] Obtain the exhaust temperature of each compressor in the air conditioner unit;

[0006] Determine the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all the compressors;

[0007] When the refrigerant distribution result is uneven refrigerant distribution, determine the target type corresponding to each compressor according to the exhaust temperatures of all the compressors. The target type is used to characterize the refrigerant amount situation of the compressor;

[0008] For each compressor, determine the target control strategy corresponding to the compressor according to the target type corresponding to the compressor;

[0009] Control the air conditioner unit according to the target control strategy.

[0010] In an optional embodiment, the uneven refrigerant distribution of the refrigerant distribution result is determined by the following method, including:

[0011] Determine the target temperature difference between the exhaust temperatures of every two compressors in the air conditioner unit to obtain a plurality of the target temperature differences;

[0012] When multiple target temperature differences meet the first preset condition, it is determined that the refrigerant distribution result is uneven refrigerant distribution, and the first preset condition includes that multiple target temperature differences are all greater than the first preset threshold.

[0013] In an alternative embodiment, the determining the target type corresponding to each compressor according to the exhaust gas temperatures of all the compressors includes:

[0014] Sort the exhaust gas temperatures of all the compressors in a preset order to obtain a target sorting result;

[0015] Determine the target type corresponding to each compressor according to the target sorting result.

[0016] In an alternative embodiment, the determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor includes:

[0017] When the target type is the first type, determine the target control strategy as the first control strategy;

[0018] Controlling the air conditioner unit according to the target control strategy includes:

[0019] When the target control strategy is the first control strategy, according to the target operation mode corresponding to the air conditioner unit, control the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to a first target opening degree or control the opening degree of the second electronic expansion valve in the air conditioner unit to be reduced to a second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; and,

[0020] Control the compressor of the first type to be heated; and,

[0021] Control the frequency of the compressor of the first type to be increased to a first target frequency.

[0022] In an alternative embodiment, the determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor includes:

[0023] When the target type is the second type, determine the target control strategy as the second control strategy;

[0024] Controlling the air conditioner unit according to the target control strategy includes:

[0025] When the target control strategy is the second control strategy, according to the target operation mode corresponding to the air conditioner unit, control the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to a first target opening degree or control the opening degree of the second electronic expansion valve to be reduced to a second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; and,

[0026] Control the frequency of the second type of compressor to be reduced to a second target frequency; and,

[0027] Control the opening degree of the injection enthalpy in the air conditioner unit to be increased to a third target opening degree. The injection enthalpy is connected to the second type of compressor; and,

[0028] Control the oil return solenoid valve in the air conditioner unit to be opened. The oil return solenoid valve is connected to the second type of compressor.

[0029] In an alternative embodiment, the first target opening degree, the second target opening degree, and the third target opening degree are determined in the following manner:

[0030] Determine the maximum exhaust temperature and the minimum exhaust temperature from the target sorting result;

[0031] Determine the first target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature, and a first preset coefficient corresponding to the first electronic expansion valve, determine the second target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature, and a second preset coefficient corresponding to the second electronic expansion valve, and determine the third target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature, and a third preset coefficient corresponding to the injection enthalpy.

[0032] In an alternative embodiment, after performing the step of controlling the air conditioner unit according to the target control strategy, the method further includes:

[0033] After a first preset duration, return to perform the step of obtaining the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0034] When the plurality of target temperature differences meet a second preset condition, control the air conditioner unit to operate in the target operation mode. The second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold.

[0035] In an alternative embodiment, after performing the step of controlling the air conditioner unit according to the target control strategy, the method further includes:

[0036] After a first preset duration, return to execute the step of obtaining the exhaust temperature of each of the compressors in the air conditioner unit to obtain a plurality of the target temperature differences;

[0037] When the plurality of the target temperature differences do not meet a second preset condition, control the air conditioner unit to operate in a target operation mode for a second preset duration, where the second preset condition includes that the plurality of the target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold;

[0038] After operating for the second preset duration, return to execute the step of obtaining the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0039] When the plurality of the target temperature differences do not meet the second preset condition for a preset number of times, control a prompting device in the air conditioner unit to operate.

[0040] In a second aspect, an embodiment of the present application provides a control device for an air conditioner unit. The outdoor unit in the air conditioner unit includes a plurality of compressors connected in parallel. The device includes:

[0041] An acquisition module, configured to acquire the exhaust temperature of each of the compressors in the air conditioner unit;

[0042] A determination module, configured to determine a refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all the compressors;

[0043] The determination module is further configured to, when the refrigerant distribution result is uneven refrigerant distribution, determine a target type corresponding to each of the compressors according to the exhaust temperatures of all the compressors, where the target type is used to characterize the refrigerant amount situation of the compressor;

[0044] The determination module is further configured to, for each of the compressors, determine a target control strategy corresponding to the compressor according to the target type corresponding to the compressor;

[0045] A control module, configured to control the air conditioner unit according to the target control strategy.

[0046] In a third aspect, an embodiment of the present application provides an air conditioner unit, including: an outdoor unit, a controller, and a memory connected to the controller. A plurality of compressors connected in parallel are arranged in the outdoor unit, and the plurality of compressors are connected to the controller. The controller is configured to execute a control program of the air conditioner unit stored in the memory to implement the control method of the air conditioner unit as described above.

[0047] A control method for an air conditioner unit provided by the present application. The outdoor unit in the air conditioner unit includes multiple compressors connected in parallel. The method includes: obtaining the exhaust temperature of each compressor in the air conditioner unit; determining the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors; when the refrigerant distribution result is uneven refrigerant distribution, determining the target type corresponding to each compressor in the air conditioner unit according to the exhaust temperatures of all compressors, where the target type is used to characterize the refrigerant amount situation in the compressor; for each compressor, determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; and controlling the air conditioner unit according to the target control strategy. By the above method, in the control method for an air conditioner unit provided by the present application, when it is determined that the refrigerant distribution in the compressor is uneven, the target control strategies corresponding to different compressors are determined according to the refrigerant amount situations in the determined compressors, and the air conditioner unit is controlled according to the target control strategies to solve the problem of uneven refrigerant distribution, thereby improving the operation reliability of the air conditioner unit and extending the service life of the air conditioner unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 FIG. shows a schematic flowchart of a control method for an air conditioner unit provided by an embodiment of the present application;

[0049] Figure 2 FIG. shows a schematic flowchart of another control method for an air conditioner unit provided by an embodiment of the present application;

[0050] Figure 3 FIG. shows a schematic diagram of the pipeline connection between components in an air conditioner unit provided by an embodiment of the present application;

[0051] Figure 4 FIG. shows a schematic structural diagram of a control device for an air conditioner unit provided by an embodiment of the present application.

[0052] Figure 5 FIG. shows a schematic structural diagram of an air conditioner unit provided by an embodiment of the present application;

[0053] In the above drawings:

[0054] 101, First compressor; 102, Second compressor; 103, First oil return solenoid valve; 104, First injection enthalpy; 105, Second oil return solenoid valve; 106, Second injection enthalpy; 107, Oil separator; 108, Outdoor heat exchanger; 109, First electronic expansion valve; 110, Second electronic expansion valve; 111, Gas-liquid separator; 112, Third oil return solenoid valve;

[0055] 10, Acquisition module; 20, Determination module; 30, Control module;

[0056] 500, Air conditioner unit; 501, Processor; 502, Memory; 5021, Operating system; 5022, Application program; 503, User interface; 504, Network interface; 505, Bus system. Detailed implementation manners

[0057] The following will describe the implementation manners of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the protection scope of the present invention.

[0058] For the convenience of understanding the embodiments of the present application, the following will further explain with specific examples in combination with the accompanying drawings. The examples do not constitute a limitation to the embodiments of the present application.

[0059] Reference Figure 1 , Figure 1 is a schematic flowchart of a control method for an air conditioner unit provided in an embodiment of the present application. A control method for an air conditioner unit provided in an embodiment of the present application includes the following steps:

[0060] S101: Obtain the exhaust temperature of each compressor in the air conditioner unit.

[0061] In this embodiment, the outdoor unit in the air conditioner unit includes multiple compressors connected in parallel. Among them, the multiple compressors specifically refer to two compressors and more than two compressors. A temperature sensor is provided at the exhaust port of each compressor in the air conditioner unit. Each temperature sensor is used to collect the exhaust temperature of the corresponding compressor's exhaust port and send the exhaust temperature to the processor in the air conditioner unit, so that the processor executes the following steps S102 to S105 according to the exhaust temperatures of the respective compressors received. It should be noted that before executing step S101, it is necessary to determine whether the air conditioner unit meets the third preset condition. Only when it is determined that the air conditioner unit meets the third preset condition, step S101 is executed. The third preset condition includes: the air conditioner unit operates in the target operation mode for the third preset duration after being turned on. In the above, the target operation mode can be the heating mode, and the target operation mode can also be the cooling mode. The target operation mode can be set by the user himself, and the third preset duration can be set according to actual needs. The specific value of the third preset duration is not limited in this embodiment. For example, the third preset duration can be 1 minute. Through the above method, in the initial stage of turning on the air conditioner unit, by obtaining the exhaust temperature of each compressor in the air conditioner unit, the refrigerant distribution situation of each compressor in the air conditioner unit is determined, so as to control the air conditioner unit when the refrigerant distribution is uneven, so that the refrigerant distribution of each compressor is finally uniform, improving the operation reliability of the air conditioner unit and extending the service life of the air conditioner unit.

[0062] S102: Determine the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors.

[0063] In this embodiment, after obtaining the exhaust temperature of each compressor in the air conditioner unit, by comparing the exhaust temperatures, the refrigerant distribution result corresponding to the air conditioner unit is determined. Among them, determining the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors in the air conditioner unit includes:

[0064] Determine the target temperature difference value between the exhaust temperatures of every two compressors in the air conditioner unit to obtain multiple target temperature difference values;

[0065] Determine whether the multiple target temperature difference values meet the first preset condition. The first preset condition includes that the multiple target temperature difference values are all greater than the first preset threshold;

[0066] When the multiple target temperature difference values meet the first preset condition, determine that the refrigerant distribution result is uneven refrigerant distribution;

[0067] When the multiple target temperature difference values do not meet the first preset condition, determine that the refrigerant distribution result is uniform refrigerant distribution.

[0068] Among them, the first preset threshold is related to the number of parallel compressors. The corresponding relationship between different first preset thresholds and the number of parallel compressors can be preset in advance. When controlling the air-conditioning unit, the corresponding relationship can be queried according to the number of parallel compressors to determine the first preset threshold. The first preset threshold can be set according to actual needs, and the specific value of the first preset threshold is not limited in this embodiment. The target temperature difference value can be an absolute value. When it is determined that the refrigerant distribution result is uniform refrigerant distribution, the air-conditioning unit can be controlled to continue operating in the target operating mode. The target operating mode can be specifically referred to as described above, and this embodiment will not elaborate here. When it is determined that the refrigerant distribution result is uneven refrigerant distribution, the steps after step S103 are executed to control the air-conditioning unit. It should be noted that when the air-conditioning unit only includes two compressors A and B connected in parallel, the obtained target temperature difference value is one, that is, the absolute value of the difference between the discharge temperature of compressor A and the discharge temperature of compressor B. When the air-conditioning unit includes three compressors A, B, and C connected in parallel, the obtained target temperature difference values are three, that is, the absolute value of the difference between the discharge temperature of compressor A and the discharge temperature of compressor B, the absolute value of the difference between the discharge temperature of compressor A and the discharge temperature of compressor C, and the absolute value of the difference between the discharge temperature of compressor B and the discharge temperature of compressor C. Of course, when the air-conditioning unit includes more than three compressors connected in parallel, the determination of the target temperature difference value can be referred to the determination method of the target temperature difference value when the air-conditioning unit includes three compressors connected in parallel, and this embodiment will not elaborate here.

[0069] S103: When the refrigerant distribution result is uneven refrigerant distribution, determine the target type corresponding to each compressor according to the discharge temperatures of all compressors. The target type is used to characterize the refrigerant amount situation in the compressor.

[0070] In this embodiment, the refrigerant amount situation in the compressor can specifically refer to that the refrigerant amount in the compressor is too much and the refrigerant amount in the compressor is too little. Among them, determining the target type corresponding to each compressor in the air-conditioning unit according to the discharge temperatures of all compressors in the air-conditioning unit includes:

[0071] Sort the discharge temperatures of all compressors in a preset order to obtain a target sorting result;

[0072] Determine the target type corresponding to each compressor according to the target sorting result.

[0073] Among them, the preset order can be in ascending order or descending order. The preset order can be specifically set according to actual needs, and it is not limited in this embodiment. After obtaining the target sorting result, according to the number of compressors in the air-conditioning unit, determine the target type corresponding to each compressor in the air-conditioning unit. Specifically, when there are two compressors connected in parallel in the air-conditioning unit, the compressor with the lowest exhaust temperature is of the first type, and the compressor with the highest exhaust temperature is of the second type. The first type is used to indicate that the refrigerant amount in this compressor is relatively large, at this time the exhaust temperature of the compressor is relatively low, and the exhaust superheat of the compressor is small; the second type is used to indicate that the refrigerant amount in this compressor is relatively small, at this time the exhaust temperature of the compressor is relatively high, and the exhaust superheat of the compressor is large. When there are three or more compressors connected in parallel in the air-conditioning unit, after obtaining the target sorting result, the target type corresponding to each compressor in the air-conditioning unit can be determined in the following way, specifically as follows:

[0074] According to the target sorting result, respectively determine the temperature differences between adjacent two exhaust temperatures in the target sorting result to obtain a plurality of temperature differences;

[0075] For each temperature difference, determine the first difference between the temperature difference and the first preset threshold to obtain a plurality of first differences;

[0076] When there is a target difference greater than the third preset threshold among the plurality of first differences, determine the first exhaust temperature and the second exhaust temperature corresponding to the target difference, and the first exhaust temperature is greater than the second exhaust temperature;

[0077] Determine the compressors corresponding to the first exhaust temperature and all the exhaust temperatures corresponding to the exhaust temperatures before the first exhaust temperature in the target sorting result as the second type, and determine the compressors corresponding to the second exhaust temperature and all the exhaust temperatures corresponding to the exhaust temperatures after the second exhaust temperature in the target exhaust temperature result as the first type;

[0078] When there is no target difference greater than the third preset threshold among the plurality of first differences, determine the compressor corresponding to the highest exhaust temperature in the target sorting result as the second type, and determine the compressors corresponding to all the exhaust temperatures except the highest exhaust temperature in the target sorting result as the first type.

[0079] In the above, the third preset threshold can be set according to actual needs, and the specific value of the third preset threshold is not limited in this embodiment. Through the above method, it is possible to achieve a fine classification of the compressor types, so as to accurately control different types of compressors, thereby achieving a uniform distribution of the refrigerant in the compressor, improving the operation reliability of the air-conditioning unit and extending the service life of the air-conditioning unit.

[0080] S104: For each compressor, determine the corresponding target control strategy according to the target type of the compressor.

[0081] In this embodiment, the target types include a first type and a second type. The specific details of the first type and the second type can be referred to the above description, and will not be elaborated here. Among them, in step S104, determining the corresponding target control strategy according to the target type of the compressor includes:

[0082] When the target type is the first type, determine the target control strategy as the first control strategy;

[0083] When the target type is the second type, determine the target control strategy as the second control strategy.

[0084] Among them, after determining the target type, different control strategies are executed for compressors of different types to make the refrigerant distribution of the final compressor uniform.

[0085] S105: Control the air-conditioning unit according to the target control strategy.

[0086] In this embodiment, before introducing step S105, first introduce the pipeline connection relationship between the components in the air-conditioning unit. Refer to Figure 3 , Figure 3 The figure shows the pipeline connection relationship between the components in the air-conditioning unit when there are two parallel compressors in the air-conditioning unit. The air-conditioning unit includes a first compressor 101, a first oil return solenoid valve 103 and a first injection enthalpy 104 connected to the first compressor 101, a second compressor 102, a second oil return solenoid valve 105 and a second injection enthalpy 106 connected to the second compressor 102, an oil separator 107 connected to the first compressor 101 and the second compressor 102, an outdoor heat exchanger 108, a first electronic expansion valve 109, a second electronic expansion valve 110, a gas-liquid separator 111 and a third oil return solenoid valve 112.

[0087] In this embodiment, when the target control strategy is of the first type, step S105 specifically includes:

[0088] When the target control strategy is the first control strategy, according to the target operation mode corresponding to the air-conditioning unit, control the opening degree of the first electronic expansion valve in the air-conditioning unit to decrease to a first target opening degree or control the opening degree of the second electronic expansion valve to decrease to a second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air-conditioning unit; and,

[0089] Control the compressor of the first type to be heated; and,

[0090] Control the frequency of the compressor of the first type to increase to a first target frequency.

[0091] Among them, the target operation mode can be referred to as described above, and will not be elaborated herein in this embodiment. When the target operation mode corresponding to the air conditioner unit is the cooling mode, only the opening degree of the first electronic expansion valve in the air conditioner unit is controlled to decrease to the first target opening degree, and the second electronic expansion valve in the air conditioner unit is controlled not to act; when the target operation mode corresponding to the air conditioner unit is the heating mode, only the opening degree of the second electronic expansion valve in the air conditioner unit is controlled to decrease to the second target opening degree, and the first electronic expansion valve in the air conditioner unit is controlled not to act. Controlling the heating of the first type of compressor can be understood as, when there is an electric heating belt in the first type of compressor, controlling the electric heating belt to work to achieve the heating of the first type of compressor; when there is a winding in the first type of compressor, controlling the winding to work to achieve the heating of the first type of compressor. By controlling the heating of the first type of compressor and controlling the increase of the frequency of the first type of compressor, the exhaust gas temperature of the first type of compressor is increased. The first target frequency can be set according to actual needs, and the specific value of the first target frequency is not limited in this embodiment.

[0092] Among the above, the first target opening degree can be determined in the following manner:

[0093] Determine the maximum exhaust gas temperature and the minimum exhaust gas temperature from the target sorting result;

[0094] According to the maximum exhaust gas temperature, the minimum exhaust gas temperature and the first preset coefficient corresponding to the first electronic expansion valve, determine the first target opening degree.

[0095] Among them, the first preset coefficient can be set according to actual needs, and the specific value of the first preset coefficient is not limited in this embodiment. Specifically, the first target opening degree X 1 is represented by the following formula:

[0096] X 1 =|T max -T min |*k 1

[0097] In the above formula, T max represents the maximum exhaust gas temperature in the target sorting result, T min represents the minimum exhaust gas temperature in the target sorting result, and k 1 represents the first preset coefficient.

[0098] Among the above, the second target opening degree can be determined in the following manner:

[0099] Determine the maximum exhaust gas temperature and the minimum exhaust gas temperature from the target sorting result;

[0100] Determine the second target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature, and the second preset coefficient corresponding to the first electronic expansion valve.

[0101] Among them, the second preset coefficient can be set according to actual needs. In this embodiment, the specific value of the second preset coefficient is not limited, but it is necessary to ensure that the first preset coefficient is greater than the second preset coefficient. Specifically, the second target opening degree X 2 is represented by the following formula:

[0102] X 2 = |T max - T min | * k 2

[0103] In the above formula, T max represents the maximum exhaust temperature in the target sorting result, T min represents the minimum exhaust temperature in the target sorting result, and k 2 represents the second preset coefficient.

[0104] In this embodiment, when the target control strategy is the second control strategy, the specific steps of S105 include:

[0105] When the target control strategy is the second control strategy, according to the target operating mode corresponding to the air conditioner unit, control the opening degree of the first electronic expansion valve in the air conditioner unit to decrease to the first target opening degree or control the opening degree of the second electronic expansion valve in the air conditioner unit to decrease to the second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; and,

[0106] Control the frequency of the second type of compressor to decrease to the second target frequency; and,

[0107] Control the opening degree of the injection enthalpy in the air conditioner unit to increase to the third target opening degree. The injection enthalpy is connected to the second type of compressor; and,

[0108] Control the oil return solenoid valve in the air conditioner unit to open. The oil return solenoid valve is connected to the second type of compressor.

[0109] Among them, when it is determined that the refrigerant distribution result is uneven refrigerant distribution, there are both compressors of the first type and compressors of the second type among the multiple compressors. Therefore, when the target control strategy is the second control strategy, according to the target operation mode corresponding to the air-conditioning unit, controlling the opening degree of the first electronic expansion valve in the air-conditioning unit to decrease to the first target opening degree or controlling the opening degree of the second electronic expansion valve to decrease to the second target opening degree is the same as the control method when the target control strategy is the first control strategy. For details, reference can be made to the above description, and this embodiment will not elaborate here. By controlling to reduce the frequency of the compressors of the second type and increase the opening degree of the injection enthalpy, the exhaust temperature of the compressors of the second type is reduced, and by controlling the oil return solenoid valve connected to the compressors of the second type to open, the refrigerant bypass flux is increased to further alleviate the uneven refrigerant distribution. The second target frequency can be set according to actual needs, and the specific value of the second target frequency is not limited in this embodiment. When the compressor of the second type is Figure 3 the first compressor in Figure 3 , the oil return solenoid valve is the first oil return solenoid valve. When the compressor of the second type is

[0110] the second compressor in

[0111] Figure 3

[0112] , the oil return solenoid valve is the second oil return solenoid valve.

[0113] Among the above, the third target opening degree can be determined in the following manner: 3 Determine the maximum exhaust temperature and the minimum exhaust temperature from the target sorting result;

[0114] According to the maximum exhaust temperature, the minimum exhaust temperature and the third preset coefficient corresponding to the injection enthalpy, determine the third target opening degree. 3 X max -T min |*k 3

[0115] In the above formula, T max represents the maximum exhaust temperature in the target sorting result, T min represents the minimum exhaust temperature in the target sorting result, and k 3 represents the third preset coefficient.

[0116] In this embodiment, after performing step S105, a control method for an air-conditioning unit provided in this embodiment further includes the following steps:

[0117] After a first preset duration, return to execute the step of obtaining the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0118] When the plurality of target temperature differences meet a second preset condition, control the air conditioner unit to operate in a target operation mode. The second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold;

[0119] When the plurality of target temperature differences do not meet the second preset condition, control the air conditioner unit to operate in the target operation mode for a second preset duration;

[0120] After operating for the second preset duration, return to execute the step of obtaining the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0121] When the plurality of target temperature differences do not meet the second preset condition for a preset number of times, control the prompting device in the air conditioner unit to work.

[0122] Among them, when the plurality of target temperature differences meet the second preset condition, it indicates that at this time, through controlling the operation of the air conditioner unit, the refrigerant distribution in the compressor has been made uniform. At this time, continue to control the air conditioner to continue operating in the target operation mode when it is turned on. When the plurality of target temperature differences do not meet the second preset condition, it indicates that at this time, through controlling the operation of the air conditioner unit, the refrigerant distribution in the compressor has not been made uniform. At this time, further continue to control the air conditioner to continue operating in the target operation mode when it is turned on for a second preset duration, and then obtain a plurality of target temperature differences. When the plurality of target temperature differences meet the second preset condition, continue to control the air conditioner to continue operating in the target operation mode when it is turned on. When the plurality of target temperature differences still meet the second preset condition, continue to obtain a plurality of target temperature differences for judgment. When the plurality of target temperature differences do not meet the second preset condition for a preset number of times, it indicates that there may be a fault in the air conditioner unit at this time, and it is necessary to control the prompting device in the air conditioner unit to work. The prompting device can be a voice prompting device. The second preset threshold, the second preset duration, and the preset number of times can be set according to actual needs. In this embodiment, the specific values of the second preset threshold, the second preset duration, and the preset number of times are not limited.

[0123] A control method for an air conditioner unit provided by an embodiment of the present application, when it is determined that the refrigerant distribution in the compressor is uneven, determines the target control strategies of different compressors according to the refrigerant quantity conditions in the determined compressors, and controls the compressors according to the target control strategies to solve the problem of uneven refrigerant distribution, thereby improving the operation reliability of the air conditioner unit and extending the service life of the air conditioner unit.

[0124] Next, as an example, refer to Figure 2, a specific introduction to the control process of the air-conditioning unit is as follows:

[0125] When there are three compressors A, B, and C connected in parallel in the air-conditioning unit, after the air-conditioning unit starts and operates in the target operation mode for the third preset duration, obtain the discharge temperature T1 of compressor A, the discharge temperature T2 of compressor B, and the discharge temperature T3 of compressor C.

[0126] Determine the target temperature difference values between T1 and T2, T1 and T3, and T2 and T3 to obtain three target temperature difference values;

[0127] When the three target temperature difference values meet the first preset condition, sort T1, T2, and T3 to obtain the target sorting result;

[0128] According to the target sorting result, determine the target types corresponding to compressors A, B, and C; (assuming that the target types corresponding to compressors A and B are the first type, and the target type corresponding to compressor C is the second type)

[0129] When the target operation mode is the cooling mode, control the first electronic expansion valve to be adjusted to a first target opening; when the target operation mode is the heating mode, control the second electronic expansion valve to be adjusted to a second target opening;

[0130] For compressors A and B of the first type, respectively control compressors A and B to be heated and respectively control the frequencies of compressors A and B to be increased to a first target frequency;

[0131] For compressor C of the second type, control the frequency of compressor C to be reduced to a second target frequency, control the opening of the injection enthalpy connected to compressor C to be increased to a third target opening, and control the oil return solenoid valve connected to compressor C to be opened.

[0132] After the first preset duration, re-obtain the discharge temperature T1 of compressor A, the discharge temperature T2 of compressor B, and the discharge temperature T3 of compressor C to re-obtain three target temperature difference values;

[0133] When the three re-obtained target temperature difference values meet the second preset condition, control the air-conditioning unit to continue operating in the target operation mode;

[0134] When the three re-obtained target temperature difference values do not meet the second preset condition, control the air-conditioning unit to continue operating in the target operation mode for the second preset duration;

[0135] After operating for the second preset duration, re-obtain the discharge temperature T1 of compressor A, the discharge temperature T2 of compressor B, and the discharge temperature T3 of compressor C to re-obtain three target temperature difference values;

[0136] When the multiple target temperature differences do not meet the second preset condition for a preset number of times, control the prompting device in the air conditioner unit to operate.

[0137] When the three target temperature differences do not meet the first preset condition, control the air conditioner unit to operate in the target operation mode.

[0138] Reference Figure 4 , Figure 4 FIG. Figure 4 is a schematic structural diagram of a control device for an air conditioner unit provided by an embodiment of the present application. A control device for an air conditioner unit provided by an embodiment of the present application includes: an acquisition module 1010, a determination module 2020, and a control module 3030. Among them, the acquisition module 10 is configured to acquire the exhaust temperature of each compressor in the air conditioner unit; the determination module 20 is configured to determine the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors; the determination module 20 is further configured to, when the refrigerant distribution result is uneven refrigerant distribution, determine the target type corresponding to each compressor according to the exhaust temperatures of all compressors, and the target type is used to characterize the refrigerant amount situation of the compressor; the determination module 20 is further configured to, for each compressor, determine the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; the control module 30 is configured to control the air conditioner unit according to the target control strategy.

[0139] In this embodiment, the determination module 20 is further configured to:

[0140] Determine the target temperature difference between the exhaust temperatures of every two compressors in the air conditioner unit to obtain a plurality of the target temperature differences;

[0141] When the plurality of target temperature differences meet the first preset condition, determine that the refrigerant distribution result is uneven refrigerant distribution, and the first preset condition includes that the plurality of target temperature differences are all greater than a first preset threshold.

[0142] In this embodiment, the determination module 20 is further configured to:

[0143] Sort the exhaust temperatures of all the compressors in a preset order to obtain a target sorting result;

[0144] Determine the target type corresponding to each compressor according to the target sorting result.

[0145] In this embodiment, the determination module 20 is further configured to:

[0146] When the target type is the first type, determine that the target control strategy is the first control strategy.

[0147] In this embodiment, the control module 30 is further configured to:

[0148] When the target control strategy is the first control strategy, according to the target operation mode corresponding to the air conditioner unit, control the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to a first target opening degree or control the opening degree of the second electronic expansion valve to be reduced to a second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; and,

[0149] Control the compressor of the first type to perform heating; and,

[0150] Control the frequency of the compressor of the first type to be increased to a first target frequency.

[0151] In this embodiment, the determination module 20 is further configured to:

[0152] When the target type is the second type, determine that the target control strategy is the second control strategy.

[0153] In this embodiment, the control module 30 is further configured to:

[0154] When the target control strategy is the second control strategy, according to the target operation mode corresponding to the air conditioner unit, control the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to a first target opening degree or control the opening degree of the second electronic expansion valve to be reduced to a second target opening degree. The first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; and,

[0155] Control the frequency of the compressor of the second type to be reduced to a second target frequency; and,

[0156] Control the opening degree of the injection enthalpy in the air conditioner unit to be increased to a third target opening degree. The injection enthalpy is connected to the compressor of the second type; and,

[0157] Control the oil return solenoid valve in the air conditioner unit to be opened. The oil return solenoid valve is connected to the compressor of the second type.

[0158] In this embodiment, the determination module 20 is further configured to:

[0159] Determine the maximum exhaust temperature and the minimum exhaust temperature from the target sorting result;

[0160] According to the maximum exhaust temperature, the minimum exhaust temperature and the first preset coefficient corresponding to the first electronic expansion valve, determine the first target opening degree. According to the maximum exhaust temperature, the minimum exhaust temperature and the second preset coefficient corresponding to the second electronic expansion valve, determine the second target opening degree. And according to the maximum exhaust temperature, the minimum exhaust temperature and the third preset coefficient corresponding to the injection enthalpy, determine the third target opening degree.

[0161] In this embodiment, the control module 30 is further configured to:

[0162] After controlling the air conditioner unit for a first duration according to the target control strategy, obtain the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0163] When the plurality of target temperature differences meet a second preset condition, control the air conditioner unit to operate in a target operation mode, where the second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold.

[0164] In this embodiment, the control module 30 is further configured to:

[0165] After controlling the air conditioner unit for a first duration according to the target control strategy, obtain the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0166] When the plurality of target temperature differences do not meet the second preset condition, control the air conditioner unit to operate in the target operation mode for a second preset duration, where the second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold;

[0167] After operating for the second preset duration, obtain the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences;

[0168] When the plurality of target temperature differences do not meet the second preset condition for a preset number of times, control the prompting device in the air conditioner unit to work.

[0169] A control device for an air conditioner unit provided by an embodiment of the present application, when determining that the refrigerant distribution in the compressor is uneven, determines the target control strategy for different compressors according to the refrigerant quantity conditions in the determined respective compressors, and controls the compressors according to the target control strategy to solve the problem of uneven refrigerant distribution, thereby improving the operation reliability of the air conditioner unit and extending the service life of the air conditioner unit.

[0170] Figure 5 It is a schematic structural diagram of an air conditioner unit provided by an embodiment of the present application. Figure 5The air conditioner unit 500 shown includes: at least one processor 501, a memory 502, at least one network interface 504, and other user interfaces 503. Each component in the air conditioner unit 500 is coupled together through a bus system 505. It can be understood that the bus system 505 is used to implement the connection and communication between these components. In addition to a data bus, the bus system 505 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear illustration, in Figure 5 all kinds of buses are labeled as the bus system 505.

[0171] Among them, the user interface 503 may include a display, a keyboard, or a pointing device (for example, a mouse, a trackball, a touchpad, or a touch screen, etc.).

[0172] It can be understood that the memory 502 in the embodiments of this application may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM). The memory 502 described herein is intended to include but not be limited to these and any other suitable types of memory.

[0173] In some embodiments, the memory 502 stores the following elements, executable units, or data structures, or subsets thereof, or extended sets thereof: an operating system 5021 and an application program 5022.

[0174] Among them, the operating system 5021 includes various system programs, such as the framework layer, the core library layer, the driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application program 5022 includes various application programs, such as a Media Player, a Browser, etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present application may be included in the application program 5022.

[0175] In the embodiment of the present application, by calling the program or instruction stored in the memory 502, specifically, it may be the program or instruction stored in the application program 5022, the processor 501 is used to execute the method steps provided by each method embodiment, for example, including: obtaining the exhaust temperature of each compressor in the air-conditioning unit; determining the refrigerant distribution result corresponding to the air-conditioning unit according to the exhaust temperatures of all compressors; when the refrigerant distribution result is uneven refrigerant distribution, determining the target type corresponding to each compressor in the air-conditioning unit according to the exhaust temperatures of all compressors, where the target type is used to characterize the refrigerant amount situation in the compressor; for each compressor, determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; controlling the air-conditioning unit according to the target control strategy.

[0176] The method disclosed in the embodiment of the present application above can be applied to the processor 501 or implemented by the processor 501. The processor 501 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method may be completed by the integrated logic circuit in the hardware of the processor 501 or by the instruction in software form. The above-mentioned processor 501 may be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiment of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiment of the present application may be directly embodied as being executed and completed by the hardware decoding processor, or executed and completed by the combination of the hardware and software units in the decoding processor. The software unit may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502 and combines its hardware to complete the steps of the above method.

[0177] It is understandable that the embodiments described herein can be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in this application, or a combination thereof.

[0178] For software implementation, the technologies described herein can be implemented by units that execute the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented within the processor or outside the processor.

[0179] The air-conditioning unit provided in this embodiment can be an air-conditioning unit as shown in Figure 5 and can execute all steps of the control method of the air-conditioning unit as shown in Figure 1-2 , thereby achieving the technical effects of the control method of the air-conditioning unit shown in Figure 1-2 . For specific details, please refer to Figure 1-2 the relevant description. For the sake of brevity, it will not be elaborated here.

[0180] The embodiments of this application also provide a storage medium (computer-readable storage medium). The storage medium stores one or more programs. Among them, the storage medium can include volatile memory, such as random access memory; the memory can also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; the memory can also include a combination of the above types of memory.

[0181] When one or more programs in the storage medium can be executed by one or more processors, the control method of the air-conditioning unit executed on the control device side of the air-conditioning unit can be implemented.

[0182] The processor is used to execute the control program of the air conditioner unit stored in the memory to implement the steps of the following control method of the air conditioner unit executed on the control device side of the air conditioner unit: obtaining the exhaust temperature of each compressor in the air conditioner unit; determining the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all compressors; when the refrigerant distribution result is uneven refrigerant distribution, determining the target type corresponding to each compressor in the air conditioner unit according to the exhaust temperatures of all compressors, where the target type is used to characterize the refrigerant quantity situation in the compressor; for each compressor, determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; and controlling the air conditioner unit according to the target control strategy.

[0183] Those skilled in the art should also be able to further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0184] It should be noted that the phrases such as "one embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining embodiments to describe specific features, structures, or characteristics, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0185] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for an air conditioner unit, characterized in that, the outdoor unit in the air conditioner unit includes a plurality of compressors connected in parallel, and the method includes: obtaining the exhaust temperature of each of the compressors in the air conditioner unit; determining a refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all the compressors; when the refrigerant distribution result is uneven refrigerant distribution, determining a target type corresponding to each compressor according to the exhaust temperatures of all the compressors, where the target type is used to characterize the refrigerant quantity situation of the compressor; for each compressor, determining a target control strategy corresponding to the compressor according to the target type corresponding to the compressor; controlling the air conditioner unit according to the target control strategy; where, controlling the air conditioner unit according to the target control strategy includes: when the target control strategy is the first control strategy or the second control strategy, controlling the opening degree of the first electronic expansion valve in the air conditioner unit to decrease to a first target opening degree or controlling the opening degree of the second electronic expansion valve in the air conditioner unit to decrease to a second target opening degree, the first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; when the target operation mode corresponding to the air conditioner unit is the cooling mode, only controlling the opening degree of the first electronic expansion valve in the air conditioner unit to decrease to the first target opening degree, and controlling the second electronic expansion valve in the air conditioner unit not to act; when the target operation mode corresponding to the air conditioner unit is the heating mode, only controlling the opening degree of the second electronic expansion valve in the air conditioner unit to decrease to the second target opening degree, and controlling the first electronic expansion valve in the air conditioner unit not to act.

2. The method according to claim 1, characterized in that, the refrigerant distribution result being uneven refrigerant distribution is determined by the following method, including: determining a target temperature difference between the exhaust temperatures of every two compressors in the air conditioner unit, and obtaining a plurality of the target temperature differences; when the plurality of target temperature differences satisfy a first preset condition, determining that the refrigerant distribution result is uneven refrigerant distribution, and the first preset condition includes that the plurality of target temperature differences are all greater than a first preset threshold.

3. The method according to claim 1, characterized in that, the determining a target type corresponding to each compressor according to the exhaust temperatures of all the compressors includes: sorting the exhaust temperatures of all the compressors in a preset order to obtain a target sorting result; determining a target type corresponding to each compressor according to the target sorting result.

4. The method according to claim 3, characterized in that, the determining a target control strategy corresponding to the compressor according to the target type corresponding to the compressor includes: when the target type is the first type, determining that the target control strategy is the first control strategy; controlling the air conditioner unit according to the target control strategy further includes: When the target control strategy is the first control strategy, control the compressor of the first type to heat; and, control the frequency of the compressor of the first type to increase to a first target frequency.

5. The method according to claim 3, wherein, the determining the target control strategy corresponding to the compressor according to the target type corresponding to the compressor includes: when the target type is the second type, determining the target control strategy as the second control strategy; According to the target control strategy, controlling the air-conditioning unit further includes: when the target control strategy is the second control strategy, controlling the frequency of the compressor of the second type to decrease to a second target frequency; and, controlling the opening degree of the injection enthalpy in the air-conditioning unit to increase to a third target opening degree, the injection enthalpy being connected to the compressor of the second type; and, controlling the oil return solenoid valve in the air-conditioning unit to open, the oil return solenoid valve being connected to the compressor of the second type.

6. The method according to claim 5, wherein, the first target opening degree, the second target opening degree and the third target opening degree are determined by the following method: determine the maximum exhaust temperature and the minimum exhaust temperature from the target sorting result; determine the first target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature and the first preset coefficient corresponding to the first electronic expansion valve, determine the second target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature and the second preset coefficient corresponding to the second electronic expansion valve, and determine the third target opening degree according to the maximum exhaust temperature, the minimum exhaust temperature and the third preset coefficient corresponding to the injection enthalpy.

7. The method according to claim 2, wherein, after performing the step of controlling the air-conditioning unit according to the target control strategy, the method further includes: after a first preset duration, return to perform the step of obtaining the exhaust temperature of each compressor in the air-conditioning unit to obtain a plurality of target temperature differences; when the plurality of target temperature differences meet a second preset condition, control the air-conditioning unit to operate in a target operation mode, the second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold.

8. The method according to claim 2, wherein, after performing the step of controlling the air-conditioning unit according to the target control strategy, the method further includes: after a first preset duration, return to perform the step of obtaining the exhaust temperature of each compressor in the air-conditioning unit to obtain a plurality of target temperature differences; when the plurality of target temperature differences do not meet the second preset condition, control the air-conditioning unit to operate in the target operation mode for a second preset duration, the second preset condition includes that the plurality of target temperature differences are all less than a second preset threshold, and the second preset threshold is less than the first preset threshold; After the second preset time period of the work, return to execute the step of obtaining the exhaust temperature of each compressor in the air conditioner unit to obtain a plurality of target temperature differences; When the plurality of target temperature differences do not meet the second preset condition for a preset number of times, control the prompting device in the air conditioner unit to work.

9. A control device for an air conditioner unit, characterized in that, the outdoor unit in the air conditioner unit includes a plurality of compressors connected in parallel, and the device includes: an acquisition module for acquiring the exhaust temperature of each of the compressors in the air conditioner unit; a determination module for determining the refrigerant distribution result corresponding to the air conditioner unit according to the exhaust temperatures of all the compressors; the determination module is further configured to, when the refrigerant distribution result is uneven refrigerant distribution, determine the target type corresponding to each compressor according to the exhaust temperatures of all the compressors, and the target type is used to characterize the refrigerant quantity situation of the compressor; the determination module is further configured to, for each compressor, determine the target control strategy corresponding to the compressor according to the target type corresponding to the compressor; a control module for controlling the air conditioner unit according to the target control strategy; wherein, controlling the air conditioner unit according to the target control strategy includes: when the target control strategy is the first control strategy or the second control strategy, controlling the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to the first target opening degree or the opening degree of the second electronic expansion valve to be reduced to the second target opening degree according to the target operation mode corresponding to the air conditioner unit, the first electronic expansion valve is arranged in the outdoor unit, and the second electronic expansion valve is arranged in the indoor unit of the air conditioner unit; when the target operation mode corresponding to the air conditioner unit is the cooling mode, only control the opening degree of the first electronic expansion valve in the air conditioner unit to be reduced to the first target opening degree, and control the second electronic expansion valve in the air conditioner unit not to act; when the target operation mode corresponding to the air conditioner unit is the heating mode, only control the opening degree of the second electronic expansion valve in the air conditioner unit to be reduced to the second target opening degree, and control the first electronic expansion valve in the air conditioner unit not to act.

10. An air conditioner unit, characterized in that, includes: an outdoor unit, a processor and a memory connected to the processor. A plurality of compressors connected in parallel are arranged in the outdoor unit, and the plurality of compressors are connected to the processor. The processor is configured to execute a control program of the air conditioner unit stored in the memory to implement the control method of the air conditioner unit according to any one of claims 1 to 8.

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