Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium. The air conditioner comprises a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger, the first heat exchanger, the electronic expansion valve and the second heat exchanger are sequentially connected, and the first heat exchanger and the second heat exchanger are both connected with the compressor. The method comprises the steps that the compressor is controlled to operate at low frequency, and the return air superheat degree of the air conditioner is detected; and when the air return superheat degree is smaller than the first preset superheat degree, the opening degree of the electronic expansion valve is controlled to be reduced. The invention aims to reduce the operation noise in the low-frequency operation process of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method of an air conditioner, an air conditioner and a storage medium. Background Art

[0002] In some scenarios during the operation of the air conditioner, the compressor needs to run at a low frequency. Currently, the compression is relatively small during the low-frequency operation of the compressor, and the pressure difference between the high and low pressures of the system is small, which easily causes the compressor to have the risk of liquid compression, resulting in the attenuation of the compressor's output capacity. In addition, the cylinder and the vane of the compressor will be periodically separated and then fitted together, causing the compressor to produce serious operating noise. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method of an air conditioner, an air conditioner and a storage medium, aiming to reduce the operating noise of the compressor during low-frequency operation and improve the output capacity of the compressor.

[0004] To achieve the above object, the present invention provides a control method for an air conditioner, the air conditioner comprising a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger, the first heat exchanger, the electronic expansion valve and the second heat exchanger are connected in sequence, the first heat exchanger and the second heat exchanger are both connected to the compressor, and the control method for the air conditioner comprises the following steps:

[0005] Controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0006] When the return air superheat is less than a first preset superheat, the electronic expansion valve is controlled to reduce its opening.

[0007] Optionally, the step of controlling the electronic expansion valve to reduce its opening degree comprises:

[0008] Determining a difference between the first preset superheat and the return air superheat;

[0009] determining an opening adjustment value according to the difference;

[0010] The electronic expansion valve is controlled to reduce its opening according to the opening adjustment value.

[0011] Optionally, the step of determining the opening adjustment value according to the difference comprises:

[0012] Obtaining the running time of the compressor at low frequency and the indoor temperature change value;

[0013] Determine a target corresponding relationship between the difference and the opening adjustment value according to the operating time and the indoor temperature change value;

[0014] The opening adjustment value corresponding to the difference is determined according to the target corresponding relationship.

[0015] Optionally, after the step of detecting the return air superheat of the air conditioner, the method further comprises:

[0016] When the return air superheat is greater than or equal to the first preset superheat, and the return air superheat is less than or equal to the second preset superheat, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0017] When the return air superheat is greater than a second preset superheat, controlling the electronic expansion valve to increase its opening;

[0018] Wherein, the first preset superheat degree is smaller than the second preset superheat degree.

[0019] Optionally, when the return air superheat is less than a first preset superheat, before the step of controlling the electronic expansion valve to reduce the opening, the method further includes:

[0020] The first preset superheat degree is determined according to a current operating frequency of the compressor.

[0021] Optionally, after the step of controlling the electronic expansion valve to reduce the opening degree, the method further includes:

[0022] When the air conditioner is in cooling mode, obtaining the air outlet temperature of the air conditioner;

[0023] When the outlet air temperature is less than or equal to the preset temperature, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0024] When the air outlet temperature is greater than the preset temperature, the compressor is controlled to increase the frequency of operation.

[0025] Optionally, the air conditioner control method further includes:

[0026] Controlling the air conditioner to operate in cooling mode, and obtaining the current indoor ambient temperature and outdoor ambient temperature of the air conditioner;

[0027] When the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, executing the steps of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0028] Wherein, the first preset ambient temperature is lower than the second preset ambient temperature.

[0029] Optionally, the air conditioner control method further includes:

[0030] When the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, determining a target frequency of the compressor according to the outdoor ambient temperature and / or the indoor ambient temperature;

[0031] The step of controlling the compressor to operate at a low frequency comprises:

[0032] The compressor is controlled to operate at a low frequency of the target frequency.

[0033] In addition, in order to achieve the above-mentioned purpose, the present application also proposes an air conditioner, the air conditioner comprising a control device, a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger, the first heat exchanger, the electronic expansion valve and the second heat exchanger are connected in sequence, and the first heat exchanger and the second heat exchanger are both connected to the compressor;

[0034] The compressor and the electronic expansion valve are both connected to a control device, which includes: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor. When the air conditioner control program is executed by the processor, the steps of the air conditioner control method as described in any one of the above items are implemented.

[0035] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of an air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner as described in any of the above items are implemented.

[0036] The present invention proposes a control method for an air conditioner. During the low-frequency operation of the compressor, when the return air superheat is too small, the return air superheat is increased by reducing the opening of an electronic expansion valve. The increase in the return air superheat can reduce the amount of liquid in the return air of the compressor, thereby effectively reducing the risk of compressor liquid compression and reducing the collision noise between the vane and the cylinder in the compressor, thereby effectively reducing the operating noise of the compressor during the low-frequency operation process and improving the output capacity of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the hardware structure involved in the operation of an air conditioner according to an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0039] Figure 3 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0040] Figure 4 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0041] Figure 5 The figure is a flow chart of another embodiment of the air conditioner control method of the present invention.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0044] The embodiment of the present invention provides an air conditioner, which may include a wall-mounted air conditioner, a cabinet air conditioner, a mobile air conditioner, a window air conditioner, a ceiling air conditioner, and other types of air conditioners.

[0045] In the embodiment of the present invention, refer to Figure 1 The air conditioner includes a control device 100, a compressor 200, a first heat exchanger, an electronic expansion valve 300 and a second heat exchanger, wherein the first heat exchanger, the electronic expansion valve 300 and the second heat exchanger are connected in sequence, and the first heat exchanger and the second heat exchanger are both connected to the compressor 200. The compressor 200 and the electronic expansion valve 300 are both connected to the control device 100.

[0046] In this embodiment, the compressor 200 is a rotor compressor. During the operation of the compressor 200, the eccentric cylindrical rotor in the cylinder performs regular periodic activities to change the volume. Since the gaps between the components are very small, lubricating oil fills the gaps, which plays a role in lubrication and sealing. Whether the design gaps between the various components of the compressor 200 are reasonable and whether the lubricating oil can effectively form an oil seal during the operation of the compressor 200 directly affect the performance of the compressor 200. If the system high pressure becomes lower and the low pressure becomes higher during the operation of the system, the compression ratio of the compressor 200 becomes smaller and the leakage of the compressor 200 becomes larger, and there is suspected liquid compression. At this time, the vane is entrained with liquid due to air intake, and the pressure in the low-pressure chamber changes, resulting in periodic and temporary separation of the cylinder of the compressor 200 and the roller sleeve vane. When the roller sleeve vane of the compressor 200 is briefly separated from the cylinder of the compressor 200 and then fits together, an impact force will be formed to hit the compressor 200, thereby forming a vibration wave. When the compressor 200 inhales liquid to a certain extent, the balancing force between the low-pressure chamber, the high-pressure chamber and the vane of the compressor 200 will be broken, resulting in high and low pressure gas blowby of the compressor 200, low compression efficiency, a significant attenuation of performance, and a rattling sound caused by the impact of the vane.

[0047] In this embodiment, the first heat exchanger is arranged indoors, and the second heat exchanger is arranged outdoors.

[0048] In one implementation, the exhaust port of the compressor 200, the second heat exchanger, the electronic expansion valve 300, the first heat exchanger, and the return port of the compressor 200 are sequentially connected. The refrigerant discharged from the compressor 200 flows through the second heat exchanger, the electronic expansion valve 300, and the first heat exchanger in sequence and then flows back to the compressor 200. The first heat exchanger is in an evaporating state, the second heat exchanger is in a condensing state, and the operation mode of the air conditioner is a cooling mode.

[0049] In another implementation, the exhaust port of the compressor 200, the first heat exchanger, the electronic expansion valve 300, the second heat exchanger, and the return port of the compressor 200 are sequentially connected. The refrigerant discharged from the compressor 200 flows through the first heat exchanger, the electronic expansion valve 300, and the second heat exchanger in sequence and then flows back to the compressor 200. The first heat exchanger is in a condensing state, the second heat exchanger is in an evaporating state, and the operation mode of the air conditioner is a heating mode.

[0050] In another implementation, the air conditioner further includes a reversing assembly, and the exhaust port of the compressor 200, the return air port of the compressor 200, the first heat exchanger, and the second heat exchanger are all connected to the reversing assembly. The reversing component has a first operating state and a second operating state. When the reversing component is operating in the first operating state, the exhaust port of the compressor 200 is connected to the second heat exchanger, and the return air port of the compressor 200 is connected to the first heat exchanger. The refrigerant discharged from the compressor 200 flows through the second heat exchanger, the electronic expansion valve 300 and the first heat exchanger in sequence and then flows back to the compressor 200. The first heat exchanger is in an evaporating state, and the second heat exchanger is in a condensing state. The operating mode of the air conditioner is a cooling mode. When the reversing component is operating in the second operating state, the exhaust port of the compressor 200 is connected to the first heat exchanger, and the return air port of the compressor 200 is connected to the second heat exchanger. The refrigerant discharged from the compressor 200 flows through the first heat exchanger, the electronic expansion valve 300 and the second heat exchanger in sequence and then flows back to the compressor 200. The first heat exchanger is in a condensing state, and the second heat exchanger is in an evaporating state. The operating mode of the air conditioner is a heating mode.

[0051] Furthermore, in this embodiment, the air conditioner also includes a return air temperature sensor 01 connected to the control device 100 and disposed at the return air port of the compressor 200 . The return air temperature sensor 01 is used to detect the return air temperature of the compressor 200 .

[0052] Furthermore, in this embodiment, the air conditioner also includes a temperature detection module 02 connected to the control device 100, which is arranged on the coil of the first heat exchanger and / or the second heat exchanger, and the temperature detection module 02 is used to detect the evaporation temperature when the heat exchanger is in an evaporating state.

[0053] Furthermore, in this embodiment, the air conditioner also includes an outlet air temperature sensor 03 connected to the control device 100, which is arranged at the air outlet of the air conditioner and is used to detect the outlet air temperature.

[0054] Furthermore, in this embodiment, the air conditioner further includes an environment detection module 04 connected to the control device 100, which is disposed in the environment where the air conditioner is located. In this embodiment, the environment detection module 04 includes an indoor temperature sensor and an outdoor temperature sensor. The indoor temperature sensor is disposed in the indoor space regulated by the air conditioner and is used to detect the indoor environment temperature; the outdoor temperature sensor is disposed in the outdoor environment where the air conditioner is located and is used to detect the outdoor environment temperature.

[0055] In the embodiment of the present invention, refer to Figure 1 The control device 100 of the air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0057] like Figure 1 As shown, the memory 1002 as a computer storage medium may include a control program for the air conditioner.

[0058] exist Figure 1 In the device shown, the processor 1001 can be used to call the air conditioner control program stored in the memory 1002 and execute the relevant steps of the air conditioner control method in the following embodiments.

[0059] The embodiment of the present invention further provides a control method of an air conditioner, which is applied to the above-mentioned air conditioner.

[0060] Reference Figure 2 , an embodiment of a control method of an air conditioner of the present application is proposed. In this embodiment, the control method of the air conditioner includes:

[0061] Step S10, controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0062] When the compressor operates at a frequency not exceeding 50 Hz, it can be considered that the compressor operates at a low frequency. In the embodiment of the present invention, when the compressor operates at a low frequency, the operating frequency of the compressor is less than or equal to 16 Hz.

[0063] The compressor can be operated at a fixed frequency or a variable frequency during low-frequency operation. The frequency of the compressor during low-frequency operation can be a preset fixed value or a frequency determined according to the actual operating state parameters of the air conditioner.

[0064] During the low-frequency operation of the compressor, the return air temperature currently detected by the return air temperature sensor and the evaporating temperature currently detected by the temperature detection module on the heat exchanger in the evaporating state are obtained, and the temperature difference between the return air temperature and the evaporating temperature is used as the return air superheat.

[0065] Step S20: When the return air superheat is less than a first preset superheat, the electronic expansion valve is controlled to reduce its opening.

[0066] The first preset superheat is specifically the minimum superheat allowed when the noise value generated during the operation of the compressor is less than a preset threshold and / or the output capacity of the compressor is greater than the preset capacity. The first preset superheat may be a preset fixed value, or a value determined according to actual state parameters of the air conditioner (e.g., a fan speed corresponding to the heat exchanger and / or a compressor operating frequency and / or an ambient temperature, etc.). In this embodiment, the first preset superheat is greater than 0.

[0067] When the return air superheat is less than the first preset superheat, it can be considered that the compressor operation noise is relatively large at this time; when the return air superheat is not less than the first preset superheat, it can be considered that the compressor operation noise is relatively small at this time.

[0068] The electronic expansion valve can adjust the opening according to the preset fixed opening adjustment parameters during the process of reducing the opening, and can also adjust the opening according to the opening adjustment parameters determined by the actual state parameters of the air conditioner (such as the fan speed corresponding to the heat exchanger and / or the compressor operating frequency and / or the ambient temperature, etc.). The opening adjustment parameters here include the adjustment rate and / or the adjustment amplitude, etc.

[0069] An embodiment of the present invention proposes a control method for an air conditioner. During the low-frequency operation of the compressor, when the return air superheat is too small, the return air superheat is increased by reducing the opening of an electronic expansion valve. The increase in the return air superheat can reduce the amount of liquid in the compressor return air, thereby effectively reducing the risk of compressor liquid compression and reducing the collision noise between the vane and the cylinder in the compressor, thereby effectively reducing the operating noise of the compressor during the low-frequency operation process and improving the output capacity of the compressor.

[0070] Furthermore, in this embodiment, when the return air superheat is less than a first preset superheat, before the step of controlling the electronic expansion valve to reduce the opening, it also includes: determining the first preset superheat according to the current operating frequency of the compressor.

[0071] Different frequencies correspond to different first preset superheats, and the first preset superheat is negatively correlated with the frequency. The corresponding relationship between the frequency and the first preset superheat can be preset, and the corresponding relationship can include a calculation relationship or a mapping relationship, etc. Based on the corresponding relationship, the first preset superheat corresponding to the current compressor frequency can be determined.

[0072] In one implementation, different frequency intervals may be associated with different pre-stored superheats, and the frequency interval in which the current operating frequency of the compressor is located is determined, and the pre-stored superheat associated with the frequency interval is used as the first preset superheat here.

[0073] In another implementation, a relationship between frequency and preset superheat is pre-established, and the current operating frequency of the compressor is substituted into the relationship to calculate the first preset superheat.

[0074] The first preset superheat degree here is greater than or equal to the minimum superheat degree allowed for reliable operation of the compressor.

[0075] In this embodiment, the risk of noise generation varies with the frequency of compressor operation. Based on this, the first preset superheat is determined according to the frequency. The smaller the frequency, the greater the risk of noise generation. The corresponding first preset superheat is larger, which is conducive to ensuring that the return air superheat can be increased in time through the regulation of the electronic expansion valve, which is conducive to further reducing the operating noise of the compressor. The larger the frequency, the smaller the risk of noise generation. The corresponding first preset superheat is smaller, which is conducive to reducing the unnecessary increase of the opening of the electronic expansion valve, and is conducive to avoiding unnecessary loss of air conditioning heat exchange capacity, ensuring indoor comfort. Based on this, it is conducive to further reducing the risk of noise generation by the compressor, improving the output capacity of the compressor, and improving indoor comfort.

[0076] Furthermore, in this embodiment, the step of controlling the electronic expansion valve to reduce the opening includes: determining the difference between the first preset superheat and the return air superheat; determining an opening adjustment value based on the difference; and controlling the electronic expansion valve to reduce the opening according to the opening adjustment value.

[0077] Different difference values ​​correspond to different opening adjustment values, and the opening adjustment value is positively correlated with the difference value. The corresponding relationship between the difference value and the opening adjustment value can be a preset fixed relationship, and the target corresponding relationship between the difference value and the opening adjustment value can also be determined according to the actual operation of the air conditioner. Based on the corresponding relationship, the opening adjustment value corresponding to the current difference value can be determined.

[0078] In this embodiment, the opening adjustment value is determined based on the difference between the first preset superheat and the return air superheat, which is conducive to ensuring that after the opening of the electronic expansion valve is adjusted, the situation where the compressor return air carries liquid can be quickly eliminated, thereby further ensuring the effective reduction of the compressor operating noise and the effective improvement of the compressor output capacity.

[0079] Furthermore, in this embodiment, the step of determining the opening adjustment value based on the difference includes: obtaining the operating time of the compressor at low frequency and the indoor temperature change value; determining the target corresponding relationship between the difference and the opening adjustment value based on the operating time and the indoor temperature change value; and determining the opening adjustment value corresponding to the difference based on the target corresponding relationship.

[0080] The operating time here is the total time from the start of low-frequency operation of the compressor to the current moment.

[0081] The indoor temperature change value is specifically the change in indoor temperature per unit time during the low-frequency operation of the compressor.

[0082] Different operating time and different indoor temperature change values ​​correspond to different target correspondences.

[0083] In one implementation, a characteristic value representing the indoor heat exchange demand can be determined based on the operating time and the indoor temperature change value, the numerical range in which the characteristic value is located can be determined, and the preset correspondence between the difference associated with the numerical range and the opening adjustment value is used as the target correspondence here.

[0084] In another implementation, the model coefficients in a preset mathematical model that characterize the relationship between the difference and the opening adjustment value can be determined based on the operating time and the indoor temperature change value. The preset mathematical model with known model coefficients is used as the target mathematical model, and the difference is input into the target mathematical model to calculate the opening adjustment value here.

[0085] In this embodiment, the opening adjustment value corresponding to the difference is determined by combining the target correspondence between the compressor low-frequency operation time and the indoor temperature change value, which is conducive to ensuring that the opening adjustment of the electronic expansion valve can reduce the compressor operation noise, improve the compressor output capacity while ensuring indoor temperature comfort.

[0086] Furthermore, based on the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed.

[0087] In this embodiment, refer to Figure 3 , after step S10, further comprising:

[0088] Step S30, when the return air superheat is greater than or equal to the first preset superheat, and the return air superheat is less than or equal to the second preset superheat, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0089] Step S40, when the return air superheat is greater than a second preset superheat, controlling the electronic expansion valve to increase its opening; wherein the first preset superheat is less than the second preset superheat.

[0090] The second preset superheat is specifically the maximum superheat allowed for stable operation of the compressor. The second preset superheat may be a preset fixed value, or a value determined according to actual state parameters of the air conditioner (e.g., fan speed corresponding to the heat exchanger and / or compressor operating frequency and / or ambient temperature, etc.).

[0091] When the return air superheat is greater than the second preset superheat, it can be considered that the compressor has reliability problems at this time; when the return air superheat is not greater than the second preset superheat, it can be considered that the operating noise of the compressor is small and can operate stably.

[0092] During the process of increasing the opening degree of the electronic expansion valve, the opening degree can be adjusted according to the preset fixed opening degree adjustment parameters, and the opening degree can also be adjusted according to the opening degree adjustment parameters determined by the actual state parameters of the air conditioner (such as the fan speed corresponding to the heat exchanger and / or the compressor operating frequency and / or the ambient temperature and / or the exhaust temperature and / or the heat exchanger temperature, etc.). The opening degree adjustment parameters here include the adjustment rate and / or the adjustment amplitude, etc.

[0093] In this embodiment, through the above-mentioned method, it is possible to reduce the operating noise of the compressor, improve the output capacity of the compressor, and improve the stability of the compressor operation.

[0094] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. Figure 4 , the control method of the air conditioner further includes:

[0095] Step S11, when the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, determining a target frequency of the compressor according to the outdoor ambient temperature and / or the indoor ambient temperature;

[0096] The indoor environment temperature and the outdoor environment temperature are specifically detected by the above-mentioned environment detection module.

[0097] In one implementation, a frequency correction value may be determined according to the indoor ambient temperature and the outdoor ambient temperature, and the target frequency may be obtained by reducing the maximum frequency of a preset low frequency range according to the frequency correction value.

[0098] In another implementation, the pressure difference between the high pressure and the low pressure of the air conditioner can also be predicted based on the indoor ambient temperature and the outdoor ambient temperature, and the frequency correction value can be determined based on the deviation between the pressure difference and the preset pressure difference. The maximum frequency can be reduced according to the determined frequency correction value to obtain the target frequency here.

[0099] Among them, in the above implementation, when the target frequency is less than the minimum frequency of the preset low-frequency range, the minimum frequency is determined as the target frequency.

[0100] The step of controlling the compressor to operate at a low frequency comprises:

[0101] Step S12, controlling the compressor to operate at a low frequency of the target frequency.

[0102] In this embodiment, the indoor and outdoor ambient temperatures can accurately reflect the high and low pressure differential of the current air-conditioning system, thereby accurately reflecting the risk of liquid compression of the compressor during the current operating conditions. Therefore, determining the target frequency of the low-frequency operation of the compressor in combination with the indoor and outdoor ambient temperatures is beneficial to further reduce the operating noise of the compressor while improving the output capacity of the compressor.

[0103] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. Figure 5 , after step S20, further comprising:

[0104] Step S50, when the air conditioner is in cooling mode, obtaining the air outlet temperature of the air conditioner;

[0105] The outlet air temperature is specifically detected by the outlet air temperature sensor.

[0106] Step S60, when the outlet air temperature is less than or equal to the preset temperature, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner;

[0107] The preset temperature is specifically the maximum air outlet temperature allowed to meet the indoor cooling demand.

[0108] When the air outlet temperature is less than or equal to the preset temperature, it can be considered that the operation of the air conditioner can meet the indoor cooling comfort.

[0109] Step S70: When the air outlet temperature is greater than the preset temperature, the compressor is controlled to increase its frequency.

[0110] When the air outlet temperature is greater than the preset temperature, it can be considered that the air conditioner operation cannot meet the indoor cooling comfort.

[0111] The frequency adjustment value during the compressor up-frequency operation process can be a pre-set fixed value, or it can be determined according to the actual operating status of the air conditioner (such as the current return air superheat of the air conditioner, the temperature difference between the outlet air temperature and the preset temperature, and the temperature difference between the indoor ambient temperature and the set temperature, etc.).

[0112] In this embodiment, after the opening of the electronic expansion valve is reduced, the return air superheat increases and the refrigeration capacity of the compressor is improved. However, when the air outlet temperature is too low at this time, it indicates that the low-frequency operation process cannot be carried out and the indoor comfort cannot be ensured by adjusting the electronic expansion valve. At this time, the compressor stops running at a low frequency and increases the frequency of operation, which is conducive to the rapid improvement of the refrigeration capacity, thereby reducing the operating noise of the compressor and improving the indoor refrigeration comfort.

[0113] In other embodiments, after step S40, step S50 may also be performed.

[0114] Further, based on any of the above embodiments, in this embodiment, the control method of the air conditioner further includes:

[0115] Control the air conditioner to run in cooling mode, and obtain the current indoor ambient temperature and outdoor ambient temperature of the air conditioner; when the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, execute step S10, wherein the first preset ambient temperature is lower than the second preset ambient temperature.

[0116] The first preset ambient temperature and the second preset ambient temperature here refer to the same concepts as the first preset ambient temperature and the second preset ambient temperature mentioned above, and the execution order of step S10 and the above-mentioned step S11 is not specifically limited.

[0117] In this embodiment, the first preset ambient temperature is 26°C, and the second preset ambient temperature is 30°C.

[0118] In this embodiment, when both the indoor and outdoor ambient temperatures are low, it can be considered that the cooling demand of the air conditioner is low at this time. At this time, the compressor operates at a low frequency and is controlled based on the return air superheat in the manner mentioned in the above embodiment, thereby saving the energy consumption of the compressor on the basis of ensuring indoor comfort needs while ensuring that the compressor is in a low-noise operating state.

[0119] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for an air conditioner is stored. When the control program for the air conditioner is executed by a processor, the relevant steps of any embodiment of the control method for the air conditioner are implemented.

[0120] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger, wherein the first heat exchanger, the electronic expansion valve and the second heat exchanger are connected in sequence, and the first heat exchanger and the second heat exchanger are both connected to the compressor. The control method of the air conditioner comprises the following steps: Controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner; When the return air superheat is less than a first preset superheat, the electronic expansion valve is controlled to reduce its opening.

2. The air conditioner control method according to claim 1, characterized in that: The step of controlling the electronic expansion valve to reduce its opening degree comprises: Determining a difference between the first preset superheat and the return air superheat; determining an opening adjustment value according to the difference; The electronic expansion valve is controlled to reduce its opening according to the opening adjustment value.

3. The air conditioner control method according to claim 2, characterized in that: The step of determining the opening adjustment value according to the difference comprises: Obtaining the running time of the compressor at low frequency and the indoor temperature change value; Determine a target corresponding relationship between the difference and the opening adjustment value according to the operating time and the indoor temperature change value; The opening adjustment value corresponding to the difference is determined according to the target corresponding relationship.

4. The air conditioner control method according to claim 1, characterized in that: After the step of detecting the return air superheat of the air conditioner, the method further comprises: When the return air superheat is greater than or equal to the first preset superheat, and the return air superheat is less than or equal to the second preset superheat, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner; When the return air superheat is greater than a second preset superheat, controlling the electronic expansion valve to increase its opening; Wherein, the first preset superheat degree is smaller than the second preset superheat degree.

5. The air conditioner control method according to claim 1, characterized in that: Before the step of controlling the electronic expansion valve to reduce the opening degree when the return air superheat is less than the first preset superheat, the method further comprises: The first preset superheat degree is determined according to a current operating frequency of the compressor.

6. The air conditioner control method according to any one of claims 1 to 5, characterized in that: After the step of controlling the electronic expansion valve to reduce the opening degree, the method further includes: When the air conditioner is in cooling mode, obtaining the air outlet temperature of the air conditioner; When the outlet air temperature is less than or equal to the preset temperature, returning to the step of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner; When the air outlet temperature is greater than the preset temperature, the compressor is controlled to increase the frequency of operation.

7. The air conditioner control method according to any one of claims 1 to 5, characterized in that: The control method of the air conditioner also includes: Controlling the air conditioner to operate in cooling mode, and obtaining the current indoor ambient temperature and outdoor ambient temperature of the air conditioner; When the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, executing the steps of controlling the compressor to operate at a low frequency and detecting the return air superheat of the air conditioner; Wherein, the first preset ambient temperature is lower than the second preset ambient temperature.

8. The air conditioner control method according to claim 7, characterized in that: The control method of the air conditioner also includes: When the indoor ambient temperature is lower than a first preset ambient temperature, and the outdoor ambient temperature is lower than a second preset ambient temperature, determining a target frequency of the compressor according to the outdoor ambient temperature and / or the indoor ambient temperature; The step of controlling the compressor to operate at a low frequency comprises: The compressor is controlled to operate at a low frequency of the target frequency.

9. An air conditioner, characterized in that: The air conditioner comprises a control device, a compressor, a first heat exchanger, an electronic expansion valve and a second heat exchanger, wherein the first heat exchanger, the electronic expansion valve and the second heat exchanger are connected in sequence, and the first heat exchanger and the second heat exchanger are both connected to the compressor; The compressor and the electronic expansion valve are both connected to a control device, which includes: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program implements the steps of the air conditioner control method as described in any one of claims 1 to 8 when executed by the processor.

10. A storage medium, characterized in that: The storage medium stores a control program of the air conditioner, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 8 are implemented.

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