Air conditioner control method, machine readable storage medium and air conditioner

Abstract

The invention relates to the technical field of air treatment equipment, in particular to a control method of an air conditioner, a machine readable storage medium and the air conditioner. The control method comprises the steps that the actual refrigerant flow of the refrigerant circulation system is obtained; a target refrigerant flow interval of the refrigerant circulation system is obtained; and the opening degree of the electronic expansion valve is controlled according to the actual refrigerant flow and the target refrigerant flow interval. According to the actual refrigerant flow and the target refrigerant flow interval, the opening degree of the electronic expansion valve is controlled, the adjusting precision of the electronic expansion valve can be improved, the adjusting frequency of the electronic expansion valve can be reduced, and therefore the service life of the electronic expansion valve can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, and particularly to a control method for an air conditioner, a machine-readable storage medium, and an air conditioner. Background Art

[0002] Currently, the conventional regulation method of an electronic expansion valve in the air conditioner industry is as follows: according to the pressure and temperature at the outlet of the evaporator of the air conditioner, the superheat at the outlet of the evaporator is calculated to reflect the complete evaporation degree of the refrigerant in the evaporator, and then the opening of the electronic expansion valve is adjusted according to the difference between the superheat at the outlet of the evaporator and the target superheat. By adjusting the opening of the electronic expansion valve, the refrigerant flow rate of the refrigerant circulation system can be controlled. When the refrigerant at the outlet of the evaporator is in a two-phase state, it is very difficult to accurately detect the refrigerant temperature at the outlet of the evaporator, resulting in low accuracy of the calculated superheat. Since the above method has low accuracy in calculating the superheat and requires the superheat under the steady state of the system, it is easy to cause the problem of repeated adjustment of the electronic expansion valve, affecting the service life of the electronic expansion valve. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a control method for an air conditioner, a machine-readable storage medium, and an air conditioner that overcome the above problems or at least partially solve the above problems, aiming to solve the problem of repeated adjustment that easily occurs in the existing electronic expansion valve adjustment method, so as to achieve the purpose of improving the service life of the electronic expansion valve.

[0004] On the one hand, the present invention provides a control method for an air conditioner, including:

[0005] Obtaining the actual refrigerant flow rate of the refrigerant circulation system;

[0006] Obtaining the target refrigerant flow rate range of the refrigerant circulation system;

[0007] Controlling the opening of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range.

[0008] Optionally, the obtaining of the actual refrigerant flow rate of the refrigerant circulation system includes:

[0009] Obtaining the pressure before the valve, the temperature of the pipe before the valve, and the pressure after the valve of the electronic expansion valve;

[0010] Obtaining the refrigerant density according to the pressure before the valve and the temperature of the pipe before the valve;

[0011] Obtaining the flow coefficient of the electronic expansion valve;

[0012] Calculating the difference between the pressure before the valve and the pressure after the valve to obtain the pressure difference before and after the valve;

[0013] Obtain the actual refrigerant flow rate based on the flow coefficient, the refrigerant density, and the pressure difference before and after the valve.

[0014] Optionally, obtaining the target refrigerant flow rate range of the refrigerant circulation system includes:

[0015] Obtain the compressor performance curve;

[0016] Obtain the target refrigerant flow rate range according to the compressor performance curve.

[0017] Optionally, obtaining the actual refrigerant flow rate according to the flow coefficient, the refrigerant density, and the pressure difference before and after the valve includes:

[0018] Obtain the actual refrigerant flow rate according to the following formula:

[0019] G = 27.09 * Cv * (ΔP * den) 0.5 ;

[0020] where G is the actual refrigerant flow rate;

[0021] Cv is the flow coefficient of the electronic expansion valve;

[0022] ΔP is the pressure difference before and after the valve;

[0023] den is the refrigerant density.

[0024] Optionally, obtaining the flow coefficient of the electronic expansion valve includes:

[0025] Obtain the current opening degree of the electronic expansion valve to get the first opening degree;

[0026] Obtain the Cv curve of the electronic expansion valve;

[0027] Obtain the flow coefficient of the electronic expansion valve corresponding to the first opening degree according to the Cv curve of the electronic expansion valve.

[0028] Optionally, controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range includes:

[0029] If the actual refrigerant flow rate is less than the lower limit value of the target refrigerant flow rate range, increase the opening degree of the electronic expansion valve;

[0030] If the actual refrigerant flow rate is greater than the upper limit value of the target refrigerant flow rate range, decrease the opening degree of the electronic expansion valve;

[0031] If the actual refrigerant flow rate is within the target refrigerant flow rate range, keep the opening degree of the electronic expansion valve unchanged.

[0032] Optionally, the control method is characterized by further comprising:

[0033] In response to the operation duration of the compressor reaching a target duration, performing the step of obtaining the actual refrigerant flow rate of the refrigerant circulation system; and / or

[0034] Performing the step of controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range once every preset duration.

[0035] Optionally, the control method is characterized by further comprising:

[0036] In response to a shutdown signal, obtaining the current opening degree of the electronic expansion valve to obtain a second opening degree;

[0037] Taking the second opening degree as the initial opening degree value of the electronic expansion valve when starting up next time.

[0038] On the other hand, the present invention also provides a machine-readable storage medium, on which a machine-executable program is stored. When the machine-executable program is executed by a processor, the control method as described in any one of the above is implemented.

[0039] On yet another aspect, the present invention also provides an air conditioner, including a controller. The controller includes a memory, a processor, and a machine-executable program stored on the memory and running on the processor. When the processor executes the machine-executable program, the control method as described in any one of the above is implemented.

[0040] In the control method, machine-readable storage medium, and air conditioner of the present invention, the present invention controls the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range, which can not only improve the adjustment accuracy of the electronic expansion valve, but also reduce the adjustment frequency of the electronic expansion valve, thereby improving the service life of the electronic expansion valve.

[0041] In addition, the control method of the present invention has the beneficial effect that the control program is simple and easy to execute.

[0042] Therefore, according to the following detailed description of specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will more clearly understand the above and other objects, advantages, and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0044] Figure 1Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0045] Figure 2 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0046] Figure 3 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0047] Figure 4 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0048] Figure 5 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0049] Figure 6 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0050] Figure 7 Schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0051] Figure 8 Schematic structural diagram of a refrigerant cycle system according to an embodiment of the present invention;

[0052] Figure 9 Schematic structural diagram of a machine-readable storage medium according to an embodiment of the present invention;

[0053] Figure 10 Schematic structural diagram of an air conditioner according to an embodiment of the present invention. Detailed implementation manners

[0054] Next, refer to Figures 1 to 10 to describe the control method, machine-readable storage medium, and air conditioner of the air conditioner according to the embodiments of the present invention. Among them, the orientation or positional relationship indicated by "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "lateral", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0055] The terms "first", "second", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one such feature, that is, one or more such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a feature "comprises or includes" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0056] Unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0057] Figure 1 is a schematic flowchart of a control method of an air conditioner 100 according to an embodiment of the present invention, and in combination with Figures 2 - 10 , the present invention provides a control method for an air conditioner 100. The air conditioner 100 includes a refrigerant circulation system 110, and the refrigerant circulation system 110 includes a compressor 111, an outdoor heat exchanger 112, an electronic expansion valve 113, and an indoor heat exchanger 114 that are connected in sequence through pipelines.

[0058] A control method for an air conditioner may include the following steps:

[0059] S100, obtaining the actual refrigerant flow rate of the refrigerant circulation system;

[0060] S200, obtaining the target refrigerant flow rate range of the refrigerant circulation system;

[0061] S300, controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range.

[0062] Specifically, the electronic expansion valve is a throttling component, which has the advantages of high accuracy, rapid action, and environmental protection.

[0063] In this embodiment, the opening degree of the electronic expansion valve is controlled according to the actual refrigerant flow rate and the target refrigerant flow rate range, which can not only improve the adjustment accuracy of the electronic expansion valve, but also reduce the adjustment frequency of the electronic expansion valve, thereby improving the service life of the electronic expansion valve.

[0064] Furthermore, the control method of the present invention has the beneficial effects of simple control program and easy execution.

[0065] Furthermore, the usage scenarios of the control method of the air conditioner of the present invention can be the cooling mode or the heating mode.

[0066] As Figure 2 shown, in some alternative embodiments of the present invention, S100, obtaining the actual refrigerant flow rate of the refrigerant circulation system may include the following steps:

[0067] S101, obtaining the pressure before the valve, the temperature of the pipe before the valve and the pressure after the valve of the electronic expansion valve;

[0068] S102, obtaining the refrigerant density according to the pressure before the valve and the temperature of the pipe before the valve;

[0069] S103, obtaining the flow coefficient of the electronic expansion valve;

[0070] S104, calculating the difference between the pressure before the valve and the pressure after the valve to obtain the pressure difference before and after the valve; specifically, ΔP = P1 - P2, where P1 is the pressure before the valve and P2 is the pressure after the valve;

[0071] S105, obtaining the actual refrigerant flow rate according to the flow coefficient, the refrigerant density and the pressure difference before and after the valve.

[0072] This embodiment provides a specific method for obtaining the actual refrigerant flow rate of the refrigerant circulation system. This embodiment obtains the actual refrigerant flow rate based on the pressure difference before and after the valve, the refrigerant density and the flow coefficient of the electronic expansion valve 113. The actual refrigerant flow rate obtained by the above method has the advantages of high accuracy and high reliability.

[0073] In some alternative embodiments of the present invention, S100, a flow meter is provided on the pipeline of the refrigerant circulation system. Obtaining the actual refrigerant flow rate of the refrigerant circulation system includes: obtaining the actual refrigerant flow rate of the refrigerant circulation system through the flow meter.

[0074] As Figure 8 shown, in some alternative embodiments of the present invention, the air conditioner further includes a pressure sensor 115 before the valve, a pressure sensor 116 after the valve and a pipe temperature sensor 117. The pressure sensor 115 before the valve is used to obtain the pressure before the valve of the electronic expansion valve 113, the pressure sensor 116 after the valve is used to obtain the pressure after the valve of the electronic expansion valve 113, and the pipe temperature sensor 117 is used to obtain the temperature of the pipe before the valve of the electronic expansion valve.

[0075] Further, the pre-valve pressure sensor 115 is located on the pipeline between the outdoor heat exchanger 112 and the electronic expansion valve 113, the post-valve pressure sensor 116 is located on the pipeline between the electronic expansion valve 113 and the indoor heat exchanger 114, and the pipe temperature sensor 117 is located on the pipeline between the outdoor heat exchanger 112 and the electronic expansion valve 113.

[0076] Furthermore, the pipe temperature sensor 117 is located on the pipeline between the pre-valve pressure sensor 115 and the outdoor heat exchanger 112. Specifically, the pre-valve pipe temperature refers to the outlet temperature of the outdoor heat exchanger.

[0077] As Figure 3 shown, in some alternative embodiments of the present invention, a compressor performance curve is preset in the air conditioner.

[0078] S200. Obtaining the target refrigerant flow rate range of the refrigerant circulation system may include the following steps:

[0079] S201. Obtaining the compressor performance curve;

[0080] S202. Obtaining the target refrigerant flow rate range according to the compressor performance curve.

[0081] [[ID=2)] Further, in S202, obtaining the target refrigerant flow rate range according to the compressor performance curve includes: obtaining the flow rate range at the best efficiency of the compressor according to the compressor performance curve, and taking the refrigerant range as the target refrigerant flow rate range.

[0082] This embodiment provides a specific method for obtaining the target refrigerant flow rate range. By using the above method, a reasonable target refrigerant flow rate range can be quickly obtained, which is beneficial to more accurately controlling the opening degree of the electronic expansion valve.

[0083] In some alternative embodiments of the present invention, a target refrigerant flow rate range is preset in the air conditioning system. In this embodiment, the target refrigerant flow rate range of the refrigerant circulation system can be directly obtained.

[0084] In some alternative embodiments of the present invention, in S105, obtaining the actual refrigerant flow rate according to the flow coefficient, refrigerant density, and pressure difference before and after the valve includes:

[0085] The actual refrigerant flow rate is obtained according to the following formula:

[0086] G = 27.09 * Cv * (ΔP * den) 0.5 ;

[0087] where G is the actual refrigerant flow rate; Cv is the flow coefficient of the electronic expansion valve; ΔP is the pressure difference before and after the valve; and den is the refrigerant density.

[0088] This embodiment provides a specific algorithm for the actual refrigerant flow rate. By using the above algorithm, the actual refrigerant flow rate can be obtained quickly and more accurately, which is beneficial to more precisely and efficiently controlling the opening degree of the electronic expansion valve.

[0089] In some alternative embodiments of the present invention, the actual refrigerant flow rate can also be calculated according to other formulas.

[0090] As Figure 4 shown, in some optional embodiments of the present invention, S103, obtaining the flow coefficient of the electronic expansion valve, includes:

[0091] S1031, obtaining the current opening degree of the electronic expansion valve to obtain the first opening degree;

[0092] S1032, obtaining the Cv curve of the electronic expansion valve;

[0093] S1033, according to the Cv curve of the electronic expansion valve, obtaining the flow coefficient of the electronic expansion valve corresponding to the first opening degree.

[0094] In S1032, the Cv curve of the electronic expansion valve refers to the flow coefficient curve of the electronic expansion valve, and the Cv curve of the electronic expansion valve is pre-stored in the air conditioner. S1033 is specifically: determining the Cv value corresponding to the current opening degree on the Cv curve, and the Cv value is the flow coefficient.

[0095] This embodiment provides a specific method for obtaining the flow coefficient of the electronic expansion valve. By using the above method, the flow coefficient can be obtained quickly and accurately.

[0096] As Figure 5 shown, in some optional embodiments of the present invention, S300, controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range, includes:

[0097] S301, comparing the actual refrigerant flow rate and the target refrigerant flow rate range;

[0098] S302, if the actual refrigerant flow rate is less than the lower limit value of the target refrigerant flow rate range, then increasing the opening degree of the electronic expansion valve;

[0099] S303, if the actual refrigerant flow rate is greater than the upper limit value of the target refrigerant flow rate range, then decreasing the opening degree of the electronic expansion valve;

[0100] S304, if the actual refrigerant flow rate is within the target refrigerant flow rate range, then keeping the opening degree of the electronic expansion valve unchanged.

[0101] This embodiment provides a specific method for controlling the opening degree of the electronic expansion valve. By using the above method, the opening degree of the electronic expansion valve can be adjusted quickly and precisely.

[0102] In some optional embodiments of the present invention, the method for controlling an air conditioner further includes the following steps:

[0103] In response to the compressor being started, obtaining the operating time of the compressor;

[0104] In response to the compressor operating time reaching the target time, the step of obtaining the actual refrigerant flow rate of the refrigerant circulation system is performed.

[0105] In this embodiment, when the operating time of the compressor reaches the target time, it indicates that the system operation has reached stability. At this time, step S100 is started to be executed, which can avoid frequent adjustment of the electronic expansion valve due to system instability, thereby helping to improve the service life of the electronic expansion valve.

[0106] Furthermore, when the operating time of the compressor reaches the target time, the actual refrigerant flow rate can be obtained in real time, or the actual refrigerant flow rate can be obtained once every preset time.

[0107] In some optional embodiments of the present invention, the air conditioner control method further includes the step of controlling the opening of the electronic expansion valve based on the actual refrigerant flow rate and the target refrigerant flow rate at predetermined intervals. In this embodiment, the above method can timely adjust the opening of the electronic expansion valve according to actual operating conditions.

[0108] like Figure 6 As shown, in some optional embodiments of the present invention, the method for controlling the air conditioner further includes the following steps:

[0109] S400, in response to the shutdown signal, obtaining the current opening of the electronic expansion valve to obtain a second opening;

[0110] S500: Using the second opening as the initial opening value of the electronic expansion valve when the device is turned on next time.

[0111] In this embodiment, the current opening of the electronic expansion valve at the last shutdown is used as the initial opening value of the electronic expansion valve at the next startup, overwriting the initial opening value at the last startup. This method can further reduce the adjustment frequency of the electronic expansion valve, thereby extending the service life of the electronic expansion valve.

[0112] like Figure 7 As shown, in some optional embodiments of the present invention, a method for controlling an air conditioner may include the following steps:

[0113] S1, the air conditioner receives the power-on signal;

[0114] S2, adjust the opening of the electronic expansion valve to the initial opening E0;

[0115] S3. Determine whether the operation time of the compressor reaches the target duration Tm. If the operation time of the compressor reaches Tm and the system operation reaches stability, then execute S4. If the operation time of the compressor does not reach Tm, then execute S5.

[0116] S4. Obtain the pressure before the electronic expansion valve, the temperature of the pipe before the valve, and the pressure after the valve.

[0117] S5. Control the electronic expansion valve to maintain the initial opening E0.

[0118] S6. Obtain the refrigerant density based on the pressure before the valve and the temperature of the pipe before the valve.

[0119] S7. Obtain the Cv curve of the electronic expansion valve.

[0120] S8. Obtain the flow coefficient of the electronic expansion valve corresponding to the current opening according to the Cv curve of the electronic expansion valve.

[0121] S9. Calculate the difference between the pressure P1 before the valve and the pressure P2 after the valve to obtain the pressure difference ΔP before and after the valve.

[0122] S10. Obtain the actual refrigerant flow based on the flow coefficient, the refrigerant density, and the pressure difference before and after the valve.

[0123] S11. Obtain the performance curve of the compressor.

[0124] S12. Obtain the flow range at the best efficiency of the compressor according to the performance curve of the compressor, and use the refrigerant range as the target refrigerant flow range. The lower limit value of the target refrigerant flow range is the first threshold, and the upper limit value is the second threshold.

[0125] S13. Determine whether the actual refrigerant flow is greater than the first threshold. If the actual refrigerant flow is not greater than the first threshold, then execute S14. If the actual refrigerant flow is greater than the first threshold, then execute S15.

[0126] S14. Increase the opening of the electronic expansion valve. After S14, execute S4 every preset duration.

[0127] S15. Determine whether the actual refrigerant flow is greater than the second threshold. If the actual refrigerant flow is greater than the second threshold, then execute S16. If the actual refrigerant flow is not greater than the first threshold, then execute S17.

[0128] S16. Decrease the opening of the electronic expansion valve. After S16, execute S4 every preset duration.

[0129] S17. Keep the opening of the electronic expansion valve unchanged.

[0130] S18. The air conditioner receives a shutdown signal.

[0131] S19. Obtain the current opening degree of the electronic expansion valve to get the second opening degree;

[0132] S20. Use the second opening degree as the initial opening degree value of the electronic expansion valve when starting up next time.

[0133] In this embodiment, the refrigerant flow rate of the refrigerant circulation system is calculated based on the flow coefficient, refrigerant density, and pressure difference before and after the valve. The flow rate range threshold at the best efficiency is confirmed according to the compressor performance curve. The opening degree of the electronic expansion valve is adjusted according to the deviation between the actual refrigerant flow rate and the threshold, and its opening degree is recorded as the initial opening degree of the electronic expansion valve for the subsequent operation of the system. Therefore, while improving the adjustment accuracy, this embodiment also reduces the adjustment frequency of the electronic expansion valve, thereby improving the service life of the electronic expansion valve.

[0134] Figure 9 It is a schematic diagram of a machine-readable storage medium 200 according to an embodiment of the present invention. As Figure 9 shown, an embodiment of the present invention also provides a machine-readable storage medium 200, on which a machine-executable program 201 is stored. When the machine-executable program 201 is executed by a processor 132, it implements the control method according to any one of the above embodiments.

[0135] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any machine-readable storage medium 200 for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor 132, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or used in combination with these instruction execution systems, apparatus, or devices.

[0136] For the description of this embodiment, the machine-readable storage medium 200 can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of the machine-readable storage medium 200 include the following: an electrical connection part (electronic device) having one or more wirings, a portable computer disk cartridge (magnetic device), a random access memory 131 (RAM), a read-only memory 131 (ROM), an erasable programmable read-only memory 131 (EPROM or flash memory 131), an optical fiber device, and a portable compact disc read-only memory 131 (CDROM). Additionally, the machine-readable storage medium 200 can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other appropriate processing as necessary, and then stored in the memory 131.

[0137] Figure 10 is a schematic diagram of an air conditioner 100 according to an embodiment of the present invention, as Figure 10 shown, an embodiment of the present invention also provides an air conditioner 100, and the air conditioner 100 includes a controller 130. The controller 130 includes a memory 131, a processor 132, and a machine-executable program 201 stored on the memory 131 and running on the processor 132. When the processor 132 executes the machine-executable program 201, it implements the control method according to any one of the above embodiments.

[0138] Specifically, the controller 130 can include a processor 132 adapted to execute stored instructions and a memory 131 that provides temporary storage space for the operation of the instructions during operation. The processor 132 can be a single-core processor 132, a multi-core processor 132, a computing cluster, or any other number of other configurations. The memory 131 can include a random access memory 131 (RAM), a read-only memory 131, a flash memory, or any other suitable storage system.

[0139] The processor 132 can be connected through a system interconnection (such as PCI, PCI-Express, etc.) to an I / O interface (input / output interface) adapted to connect the air conditioner 100 to one or more I / O devices (input / output devices). The I / O devices can include, for example, a keyboard and a pointing device, and the pointing device can include a touchpad or a touch screen, etc.

[0140] The processor 132 may also be linked to a display interface adapted to connect the controller 130 to a display device through a system interconnect. The display device may include a display screen as a built-in component of the controller 130. The display device may also include a computer monitor, a television set, a projector, etc. externally connected to the air conditioner 100. In addition, a network interface controller (NIC) may be adapted to connect the controller 130 to a network through the system interconnect. In some embodiments, the NIC may use any suitable interface or protocol (such as Internet Small Computer System Interface, etc.) to transmit data. The network may be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, etc. The remote device may be connected to the controller 130 through the network.

[0141] The flowcharts provided in this embodiment are not intended to indicate that the operations of the method will be executed in any specific order, or that all operations of the method are included in every case. In addition, the method may include additional operations. Within the scope of the technical concept provided by the method in this embodiment, additional changes may be made to the above method.

[0142] There are multiple exemplary embodiments of the present invention. However, without departing from the spirit and scope of the present invention, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A control method for an air conditioner, characterized in that, Including: Obtaining the actual refrigerant flow rate of the refrigerant circulation system; Obtaining the target refrigerant flow rate range of the refrigerant circulation system; Controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range.

2. The control method according to claim 1, wherein: The obtaining of the actual refrigerant flow rate of the refrigerant circulation system includes: Obtaining the pressure before the valve, the temperature of the pipe before the valve and the pressure after the valve of the electronic expansion valve; Obtaining the refrigerant density according to the pressure before the valve and the temperature of the pipe before the valve; Obtaining the flow coefficient of the electronic expansion valve; Calculating the difference between the pressure before the valve and the pressure after the valve to obtain the pressure difference before and after the valve; Obtaining the actual refrigerant flow rate according to the flow coefficient, the refrigerant density and the pressure difference before and after the valve.

3. The control method according to claim 1, wherein: The obtaining of the target refrigerant flow rate range of the refrigerant circulation system includes: Obtaining the compressor performance curve; Obtaining the target refrigerant flow rate range according to the compressor performance curve.

4. The control method according to claim 2, wherein: The obtaining of the actual refrigerant flow rate according to the flow coefficient, the refrigerant density and the pressure difference before and after the valve includes: Obtaining the actual refrigerant flow rate according to the following formula: G = 27.09 * Cv * (ΔP * den) 0.5 ; wherein, G is the actual refrigerant flow rate; Cv is the flow coefficient of the electronic expansion valve; ΔP is the pressure difference before and after the valve; den is the refrigerant density.

5. The control method according to claim 2, wherein: The obtaining of the flow coefficient of the electronic expansion valve includes: Obtaining the current opening degree of the electronic expansion valve to obtain the first opening degree; Obtaining the Cv curve of the electronic expansion valve; Obtaining the flow coefficient of the electronic expansion valve corresponding to the first opening degree according to the Cv curve of the electronic expansion valve.

6. The control method according to claim 1, wherein: The controlling of the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range includes: If the actual refrigerant flow rate is less than the lower limit value of the target refrigerant flow rate range, increasing the opening degree of the electronic expansion valve; If the actual refrigerant flow rate is greater than the upper limit value of the target refrigerant flow rate range, decreasing the opening degree of the electronic expansion valve; If the actual refrigerant flow rate is within the target refrigerant flow rate range, keeping the opening degree of the electronic expansion valve unchanged.

7. The control method according to claim 1, wherein It further includes: Responding to the running duration of the compressor reaching the target duration, and executing the step of obtaining the actual refrigerant flow rate of the refrigerant circulation system; and / or Executing the step of controlling the opening degree of the electronic expansion valve according to the actual refrigerant flow rate and the target refrigerant flow rate range every preset duration.

8. The control method according to claim 1, characterized in that It further includes: Responding to the shutdown signal, obtaining the current opening degree of the electronic expansion valve to obtain the second opening degree; Taking the second opening degree as the initial opening degree value of the electronic expansion valve when starting up next time.

9. A machine-readable storage medium, characterized in that, It stores machine-executable programs, and when the machine-executable programs are executed by a processor, the control method as described in any one of claims 1 to 8 is implemented.

10. An air conditioner, characterized in that, It includes a controller, the controller includes a memory, a processor, and a machine-executable program stored on the memory and running on the processor, and when the processor executes the machine-executable program, it implements the control method described in any one of claims 1 to 8.

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