Control method and device of air conditioner and air conditioner

Abstract

The application relates to the air conditioning technical field, and provides an air conditioner control method and device and the air conditioner, the air conditioner control method comprises the following steps: detecting the current evaporation temperature of the compressor of the air conditioner; determining whether the current evaporation temperature of the compressor is greater than or equal to the lower limit value of the target evaporation temperature; and controlling the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor. The application can avoid the phenomenon that the evaporation temperature exceeds the operation range when the compressor operates at high temperature, so that the compressor is prevented from being damaged, the heat exchange effect of the air conditioner is ensured, and the stable reliability of the air conditioner operation is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method, device and air conditioner for an air conditioner. Background Technology

[0002] In related technologies, air conditioners are limited by the operating range of their compressors, which restricts their evaporation temperature; that is, air conditioners have a specific operating temperature range. Taking a water-cooled screw air conditioner as an example, the cooling output temperature is generally limited to a maximum of 15°C. When the unit is first turned on in summer, the room temperature is very high, and the evaporation temperature can easily exceed the compressor's operating limit, causing oil leakage from the compressor. Excessive lubricating oil entering the heat exchanger affects the heat exchange efficiency, and in severe cases, it can lead to insufficient oil in the compressor, resulting in poor compressor lubrication and damage, and low reliability of the air conditioner. Summary of the Invention

[0003] This invention provides a control method, device, and air conditioner that can prevent the evaporation temperature from exceeding the operating range when the compressor is running at high temperatures, thereby avoiding compressor damage, ensuring the heat exchange effect of the air conditioner, and improving the stability and reliability of the air conditioner's operation.

[0004] This invention provides a control method for an air conditioner, comprising:

[0005] Detect the current evaporation temperature of the air conditioner's compressor;

[0006] The current evaporation temperature of the compressor is determined to be greater than or equal to the lower limit of the target evaporation temperature. Based on the current evaporation temperature of the compressor, the opening degree of the electronic expansion valve of the air conditioner is controlled.

[0007] According to a control method for an air conditioner provided by the present invention, the step of controlling the opening degree of the electronic expansion valve of the air conditioner based on the current evaporation temperature of the compressor specifically includes:

[0008] If the current evaporation temperature of the compressor is determined to be greater than the upper limit of the target evaporation temperature, the opening of the electronic expansion valve is reduced.

[0009] Determine that the current evaporation temperature of the compressor is equal to the upper limit of the target evaporation temperature, and maintain the opening of the electronic expansion valve;

[0010] If the current evaporation temperature of the compressor is determined to be greater than or equal to the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, the opening degree of the electronic expansion valve is increased.

[0011] The control method for an air conditioner provided by the present invention further includes:

[0012] If the current evaporation temperature of the compressor is determined to be lower than the lower limit of the target evaporation temperature, the opening degree of the electronic expansion valve of the air conditioner is controlled according to the suction superheat of the compressor.

[0013] According to a control method for an air conditioner provided by the present invention, the step of controlling the opening degree of the electronic expansion valve of the air conditioner based on the suction superheat of the compressor specifically includes:

[0014] If the compressor's suction superheat is determined to be greater than the target superheat, the opening of the electronic expansion valve is increased.

[0015] Determine that the suction superheat of the compressor is equal to the target superheat, and maintain the opening of the electronic expansion valve;

[0016] If the compressor's suction superheat is determined to be less than the target superheat, the opening of the electronic expansion valve is reduced.

[0017] The control method for an air conditioner provided by the present invention further includes:

[0018] When the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature and less than or equal to the upper limit of the target evaporation temperature, the opening degree of the electronic expansion valve corresponding to the current evaporation temperature is determined according to the first opening degree and the second opening degree.

[0019] Wherein, the first opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the suction superheat of the compressor, and the second opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the current evaporation temperature of the compressor.

[0020] According to a control method for an air conditioner provided by the present invention, the step of determining the opening degree of an electronic expansion valve corresponding to the current evaporation temperature based on a first opening degree and a second opening degree includes:

[0021] The opening degree of the electronic expansion valve corresponding to the current evaporation temperature is determined by weighting the first opening degree and the second opening degree.

[0022] According to the control method of an air conditioner provided by the present invention, the weighting method is linear weighting.

[0023] According to the control method for an air conditioner provided by the present invention, the step of determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature specifically includes:

[0024]

[0025] Where x is the opening degree of the electronic expansion valve corresponding to the current evaporation temperature, m is the first opening degree, n is the second opening degree, B is the upper limit of the target evaporation temperature, C is the lower limit of the target evaporation temperature, and D is the current evaporation temperature of the compressor.

[0026] The present invention also provides a control device for an air conditioner, comprising:

[0027] The detection module is used to detect the current evaporation temperature of the air conditioner's compressor;

[0028] The control module is used to determine that the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, and to control the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor.

[0029] The present invention also provides an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described control method for the air conditioner.

[0030] The air conditioner control method, device, and air conditioner provided by this invention detect the current evaporation temperature of the air conditioner compressor. When the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, it indicates that the compressor is operating at a high temperature. Then, based on the current evaporation temperature of the compressor, the opening of the electronic expansion valve of the air conditioner is controlled to adjust the current evaporation temperature. This can prevent the evaporation temperature from exceeding the operating range when the compressor is operating at a high temperature, thereby avoiding compressor damage, ensuring the heat exchange effect of the air conditioner, and improving the stability and reliability of the air conditioner's operation. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is one of the flowcharts illustrating the control method for an air conditioner provided by the present invention;

[0033] Figure 2 This is the second flowchart illustrating the control method for an air conditioner provided by the present invention;

[0034] Figure 3 This is the third flowchart illustrating the control method for an air conditioner provided by the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the control device for the air conditioner provided by the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the air conditioner provided by the present invention.

[0037] Figure label:

[0038] 410: Detection module; 420: Control module;

[0039] 510: Processor; 520: Communication interface;

[0040] 530: Memory; 540: Communication bus. Detailed Implementation

[0041] 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 with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] The following is combined with Figures 1-5 The present invention describes a control method, apparatus, and air conditioner for an air conditioner.

[0045] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the air conditioner control method provided by the present invention mainly includes the following steps:

[0046] S100, Detect the current evaporation temperature of the air conditioner's compressor;

[0047] S200: Determine that the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, and control the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor.

[0048] The air conditioner control method provided in this embodiment of the invention detects the current evaporation temperature of the air conditioner compressor in real time. When the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, it indicates that the compressor is operating at a high temperature. Then, based on the current evaporation temperature of the compressor, the opening of the electronic expansion valve of the air conditioner is controlled to adjust the current evaporation temperature. This can avoid the phenomenon that the evaporation temperature exceeds the operating range when the compressor is operating at a high temperature, thereby avoiding compressor damage, ensuring the heat exchange effect of the air conditioner, and improving the stability and reliability of the air conditioner operation.

[0049] According to one embodiment of the present invention, referring to Figure 2 As shown, the steps for determining that the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, and controlling the opening of the electronic expansion valve of the air conditioner based on the current evaporation temperature of the compressor, specifically include:

[0050] S201. Determine that the current evaporation temperature of the compressor is greater than the upper limit of the target evaporation temperature, and reduce the opening of the electronic expansion valve;

[0051] S202. Determine that the current evaporation temperature of the compressor is equal to the upper limit of the target evaporation temperature, and maintain the opening of the electronic expansion valve;

[0052] S203. Determine that the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, and increase the opening of the electronic expansion valve.

[0053] Specifically, when the compressor is operating at high temperature, if the current evaporation temperature exceeds the upper limit of the target evaporation temperature, it indicates that the compressor is outside its operating range. In this case, reducing the opening of the electronic expansion valve reduces the refrigerant circulation flow, i.e., reduces the refrigerant flow into the evaporator, lowering the evaporator pressure and thus reducing the current evaporation temperature, bringing it within the target evaporation temperature range. Preferably, adjusting the opening of the electronic expansion valve allows the current evaporation temperature to stabilize at the upper limit of the target evaporation temperature. This prevents the evaporation temperature from exceeding the operating range during high-temperature operation and ensures the heat exchange efficiency of the air conditioner.

[0054] If the compressor's current evaporation temperature is equal to the upper limit of the target evaporation temperature when the compressor is running at high temperature, it means that the compressor's evaporation temperature has not exceeded the operating range. At this time, the opening of the electronic expansion valve is kept unchanged to avoid operating beyond the range, ensuring the stable and reliable operation of the compressor, thereby ensuring the heat exchange effect of the air conditioner.

[0055] When the compressor is running at high temperature, if the current evaporation temperature of the compressor is lower than the upper limit of the target evaporation temperature, increasing the opening of the electronic expansion valve can increase the refrigerant circulation flow, that is, increase the refrigerant flow into the evaporator, thereby increasing the evaporator pressure and thus raising the current evaporation temperature. This can bring the current evaporation temperature to the upper limit of the target evaporation temperature, avoid operating outside the range, and effectively improve the heat exchange effect of the air conditioner.

[0056] Therefore, the air conditioner control method provided in this embodiment of the invention can adjust the opening of the electronic expansion valve in real time according to the evaporation temperature of the compressor when the compressor is running at high temperature, which can prevent the compressor from exceeding the operating range, thereby achieving the purpose of protecting the compressor and ensuring the heat exchange effect of the air conditioner.

[0057] According to one embodiment of the present invention, referring to Figure 3 As shown, the control method for the air conditioner of the present invention further includes the following steps:

[0058] S300: Determine that the current evaporation temperature of the compressor is lower than the lower limit of the target evaporation temperature, and control the opening of the electronic expansion valve of the air conditioner according to the superheat of the compressor suction.

[0059] The step of controlling the opening of the air conditioner's electronic expansion valve based on the compressor's suction superheat specifically includes:

[0060] S301. Determine that the compressor's suction superheat is greater than the target superheat, and increase the opening of the electronic expansion valve;

[0061] S302. Determine that the compressor's suction superheat is equal to the target superheat, and maintain the opening of the electronic expansion valve.

[0062] S303. Determine that the compressor's suction superheat is less than the target superheat, and reduce the opening of the electronic expansion valve.

[0063] Specifically, when the current evaporation temperature of the compressor is lower than the lower limit of the target evaporation temperature, it means that the compressor is operating normally. At this time, the suction superheat of the compressor can be detected. If the suction superheat of the compressor is greater than the target superheat, it means that the suction superheat is high and the refrigerant in the evaporator is insufficient. At this time, the opening of the electronic expansion valve is increased to increase the refrigerant flow rate in order to achieve the target superheat, thereby improving the heat exchange effect of the air conditioner.

[0064] If the compressor's suction superheat is equal to the target superheat, it means that the refrigerant flow rate meets the heat exchange requirements. At this time, the opening of the electronic expansion valve is kept unchanged to ensure the stable and reliable operation of the compressor, thereby ensuring the heat exchange effect of the air conditioner.

[0065] If the compressor's suction superheat is less than the target superheat, it means that the suction superheat is low and there is too much refrigerant in the evaporator. In this case, reduce the opening of the electronic expansion valve to reduce the refrigerant flow in order to achieve the target superheat, meet the heat exchange requirements, and ensure the heat exchange effect.

[0066] Therefore, the air conditioner control method provided in this embodiment of the invention can control the opening of the electronic expansion valve according to the superheat of the compressor's suction when the compressor is running normally, which can improve the operating reliability of the compressor and ensure the heat exchange effect of the air conditioner.

[0067] According to an embodiment of the present invention, the control method of the air conditioner of the present invention further includes: when the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature and less than or equal to the upper limit of the target evaporation temperature, that is, within the target evaporation temperature range, determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature according to the first opening degree and the second opening degree;

[0068] The first opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the suction superheat of the compressor; the second opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the current evaporation temperature of the compressor.

[0069] The first opening is the opening of the electronic expansion valve obtained at the current moment according to the normal operation control of the compressor. For example, if the current suction superheat is detected and it is greater than the target superheat, the opening of the electronic expansion valve is increased to achieve the target superheat. At this time, the first opening of the electronic expansion valve at the current moment can be obtained.

[0070] Similarly, the second opening is the opening of the electronic expansion valve obtained at the current moment according to the high-temperature operation control of the compressor. For example, if the current evaporation temperature is detected and it is equal to the upper limit of the target evaporation temperature, the opening of the electronic expansion valve is kept unchanged, and the second opening of the electronic expansion valve at the current moment can be obtained.

[0071] According to an embodiment of the present invention, the step of determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature based on a first opening degree and a second opening degree includes:

[0072] The opening degree of the electronic expansion valve corresponding to the current evaporation temperature is determined by weighting the first opening degree and the second opening degree.

[0073] According to one embodiment of the present invention, the weighting method can be linear weighting.

[0074] The air conditioner control method provided in this embodiment of the invention, when the current evaporation temperature of the compressor is within the target evaporation temperature range, weights the valve opening of the compressor under normal operation control with the valve opening under high-temperature operation control, and the weighting method is linear. This allows the electronic expansion valve to achieve a smooth transition adjustment when switching between normal operation control and high-temperature operation control of the compressor. This method can effectively avoid excessive valve fluctuations when switching between normal operation control and high-temperature operation control, and reduce the impact on stability.

[0075] According to an embodiment of the present invention, the step of determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature specifically includes:

[0076]

[0077] Where x is the opening degree of the electronic expansion valve corresponding to the current evaporation temperature, m is the first opening degree, n is the second opening degree, B is the upper limit of the target evaporation temperature, C is the lower limit of the target evaporation temperature, and D is the current evaporation temperature of the compressor.

[0078] The embodiments of the present invention can accurately determine the opening value of the electronic expansion valve within the target evaporation temperature range, avoiding fluctuations in the electronic expansion valve and improving stability.

[0079] The control method for the air conditioner provided by this invention is described below with reference to a specific example, which generally includes: normal operation control of the compressor and high-temperature operation control of the compressor. The target evaporation temperature range is 20–22°C.

[0080] (1) Normal operation control of compressor: The current evaporation temperature D of the compressor is less than 20°C. At this time, the opening of the electronic expansion valve is controlled by the suction superheat.

[0081] Specifically, when the compressor's suction superheat is greater than the target superheat, the opening of the electronic expansion valve is increased; when the compressor's suction superheat is equal to the target superheat, the opening of the electronic expansion valve is maintained; when the compressor's suction superheat is less than the target superheat, the opening of the electronic expansion valve is decreased.

[0082] Therefore, the air conditioner control method provided in this embodiment of the invention can control the opening of the electronic expansion valve according to the superheat of the compressor's suction when the compressor is running normally, thereby improving the operating reliability of the compressor and ensuring the heat exchange effect of the air conditioner.

[0083] (2) High temperature operation control of compressor: The current evaporation temperature D of the compressor is ≥20℃. At this time, the opening degree of the electronic expansion valve is controlled by the evaporation temperature.

[0084] Specifically, when D>22℃, reduce the opening of the electronic expansion valve;

[0085] When D = 22℃, maintain the opening of the electronic expansion valve;

[0086] When 20≤D<22℃, increase the opening of the electronic expansion valve.

[0087] Furthermore, when 20≤D≤22℃, by linearly weighting the valve opening obtained at the current moment based on the superheat of the compressor suction gas and the valve opening obtained based on the current evaporation temperature of the compressor, the electronic expansion valve can achieve a smooth transition adjustment when switching between normal operation control and high-temperature operation control of the compressor. This method can effectively avoid excessive valve fluctuations when switching between normal operation control and high-temperature operation control, and reduce the impact on stability.

[0088] Therefore, the air conditioner control method provided in this embodiment of the invention can achieve the goal of not exceeding the operating range of the compressor by gradually weighting or even controlling the opening of the electronic expansion valve based entirely on the evaporation temperature when operating at high temperatures.

[0089] The control device for an air conditioner provided by the present invention is described below. The control device for an air conditioner described below can be referred to in correspondence with the control method for an air conditioner described above.

[0090] According to an embodiment of the second aspect of the present invention, referring to Figure 4 As shown, the present invention also provides a control device for an air conditioner, mainly comprising: a detection module 410 and a control module 420. The detection module 410 is used to detect the current evaporation temperature of the air conditioner's compressor; the control module 420 is used to determine that the current evaporation temperature of the compressor is greater than or equal to a target lower limit of the evaporation temperature, and to control the opening degree of the air conditioner's electronic expansion valve based on the current evaporation temperature of the compressor.

[0091] The control device for an air conditioner provided in this embodiment of the invention detects the current evaporation temperature of the air conditioner's compressor through the detection module 410. When the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, it indicates that the compressor is operating at a high temperature. Then, based on the current evaporation temperature of the compressor, the control module 420 controls the opening of the air conditioner's electronic expansion valve to adjust the current evaporation temperature. This can prevent the evaporation temperature from exceeding the operating range when the compressor is operating at a high temperature, thereby avoiding compressor damage and improving the stability and reliability of the air conditioner's operation.

[0092] According to an embodiment of the third aspect of the present invention, referring to Figure 5As shown, the present invention also provides an air conditioner, which may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute a control method for the air conditioner, the method including: detecting the current evaporation temperature of the air conditioner's compressor; determining that the current evaporation temperature of the compressor is greater than or equal to a target lower limit of the evaporation temperature; and controlling the opening degree of the air conditioner's electronic expansion valve according to the current evaporation temperature of the compressor.

[0093] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0094] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the control method for an air conditioner provided by the above methods. The method includes: detecting the current evaporation temperature of the air conditioner's compressor; determining that the current evaporation temperature of the compressor is greater than or equal to a target lower limit of the evaporation temperature; and controlling the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor.

[0095] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a control method for an air conditioner provided by the methods described above, the method comprising: detecting the current evaporation temperature of the compressor of the air conditioner; determining that the current evaporation temperature of the compressor is greater than or equal to a target lower limit of the evaporation temperature; and controlling the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor.

[0096] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, include: Detect the current evaporation temperature of the air conditioner's compressor; The current evaporation temperature of the compressor is determined to be greater than or equal to the lower limit of the target evaporation temperature. Based on the current evaporation temperature of the compressor, the opening degree of the electronic expansion valve of the air conditioner is controlled. If the current evaporation temperature of the compressor is determined to be lower than the lower limit of the target evaporation temperature, the opening degree of the electronic expansion valve of the air conditioner is controlled according to the suction superheat of the compressor.

2. The control method for an air conditioner according to claim 1, characterized in that, The steps of controlling the opening of the electronic expansion valve of the air conditioner based on the current evaporation temperature of the compressor specifically include: If the current evaporation temperature of the compressor is determined to be greater than the upper limit of the target evaporation temperature, the opening of the electronic expansion valve is reduced. Determine that the current evaporation temperature of the compressor is equal to the upper limit of the target evaporation temperature, and maintain the opening of the electronic expansion valve; If the current evaporation temperature of the compressor is determined to be greater than or equal to the lower limit of the target evaporation temperature and less than the upper limit of the target evaporation temperature, the opening degree of the electronic expansion valve is increased.

3. The control method for an air conditioner according to claim 1, characterized in that, The steps of controlling the opening of the electronic expansion valve of the air conditioner based on the suction superheat of the compressor specifically include: If the compressor's suction superheat is determined to be greater than the target superheat, the opening of the electronic expansion valve is increased. Determine that the suction superheat of the compressor is equal to the target superheat, and maintain the opening of the electronic expansion valve; If the compressor's suction superheat is determined to be less than the target superheat, the opening of the electronic expansion valve is reduced.

4. The control method for an air conditioner according to claim 1, characterized in that, Also includes: When the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature and less than or equal to the upper limit of the target evaporation temperature, the opening degree of the electronic expansion valve corresponding to the current evaporation temperature is determined according to the first opening degree and the second opening degree. Wherein, the first opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the suction superheat of the compressor, and the second opening degree is the opening degree of the electronic expansion valve determined at the current moment based on the current evaporation temperature of the compressor.

5. The control method for an air conditioner according to claim 4, characterized in that, The steps for determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature based on the first opening degree and the second opening degree include: The opening degree of the electronic expansion valve corresponding to the current evaporation temperature is determined by weighting the first opening degree and the second opening degree.

6. The control method for an air conditioner according to claim 5, characterized in that, The weighting method is linear weighting.

7. The control method for an air conditioner according to any one of claims 4-6, characterized in that, The steps for determining the opening degree of the electronic expansion valve corresponding to the current evaporation temperature specifically include: ； Where x is the opening degree of the electronic expansion valve corresponding to the current evaporation temperature, m is the first opening degree, n is the second opening degree, B is the upper limit of the target evaporation temperature, C is the lower limit of the target evaporation temperature, and D is the current evaporation temperature of the compressor.

8. A control device for an air conditioner, characterized in that, include: The detection module is used to detect the current evaporation temperature of the air conditioner's compressor; The control module is used to determine that the current evaporation temperature of the compressor is greater than or equal to the lower limit of the target evaporation temperature, and to control the opening degree of the electronic expansion valve of the air conditioner according to the current evaporation temperature of the compressor. If the current evaporation temperature of the compressor is determined to be lower than the lower limit of the target evaporation temperature, the opening degree of the electronic expansion valve of the air conditioner is controlled according to the suction superheat of the compressor.

9. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the control method of the air conditioner as described in any one of claims 1-7.

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