Control method and apparatus for air conditioner, air conditioner, and computer-readable storage medium

Abstract

Provided are a control method and apparatus (200) for an air conditioner (100), an air conditioner (100), and a computer-readable storage medium. The air conditioner (100) comprises a refrigerant loop formed by sequentially connecting a compressor (11), a first heat exchanger (12), a throttling device (13), and a second heat exchanger (21), and an outer fan (14) provided close to the first heat exchanger (12). The control method for the air conditioner (100) comprises: on the basis of the air conditioner (100) being in a refrigeration mode and the air conditioner (100) being in an overpressure protection state, acquiring the coil temperature of the first heat exchanger (12) and a current fan speed level F of the outer fan (14); and on the basis of the coil temperature of the first heat exchanger (12) being less than a preset temperature threshold, controlling to raise the current fan speed level F of the outer fan (14).

Description

Air conditioner control method, device, air conditioner and computer-readable storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310771724.5, filed on June 27, 2023, entitled “Control method, device, air conditioner and computer-readable storage medium for air conditioner,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of air conditioning, and in particular to a control method and device for an air conditioner, an air conditioner, and a computer-readable storage medium. Background Art

[0004] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0005] At present, with the popularization of environmental protection and the improvement of comfort requirements, the requirements for the use of air conditioners are becoming higher and higher, so the application of variable frequency fans in air conditioners is becoming more and more popular.

[0006] In the related art, if the ambient temperature is used to control the wind speed of the outdoor fan, the system cannot determine whether it is in the optimal state; if the condenser coil temperature is used to control the fan, when the air conditioner is operated in low-temperature cooling mode, the condenser tube temperature sensor cannot reflect its true temperature due to uneven refrigerant distribution and refrigerant deposition, resulting in the outdoor fan speed response not being timely, and the system frequently having over-pressure protection problems, thereby affecting the normal operation of the air conditioner.

[0007] Summary of the Invention

[0008] The present application aims to provide an air conditioner control method, device, air conditioner, and computer-readable storage medium to at least address the technical problem that, when the air conditioner is operating in low-temperature cooling mode, the measured temperature of the first heat exchanger fails to reflect its actual pressure due to uneven refrigerant flow distribution and refrigerant deposition, thereby causing the outdoor fan speed to respond untimely and the system to frequently trigger high-pressure protection. This objective is achieved through the following technical solutions:

[0009] In a first aspect, the present application provides a method for controlling an air conditioner, the air conditioner including a refrigerant circuit formed by a compressor, a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence, and an outdoor fan disposed near the first heat exchanger. The method for controlling the air conditioner includes:

[0010] According to the air conditioner being in cooling mode and in a high pressure protection state, obtaining the coil temperature of the first heat exchanger and the current wind speed F of the outdoor fan;

[0011] According to the coil temperature of the first heat exchanger being lower than a preset temperature threshold, the current wind speed F of the external fan is controlled to be increased.

[0012] According to the control method of the air conditioner provided in the present application, when the air conditioner is in cooling mode and in high-pressure protection state, the coil temperature of the first heat exchanger is obtained, and it is determined whether the coil temperature of the first heat exchanger is lower than the preset temperature threshold. If the coil temperature of the first heat exchanger is lower than the preset temperature threshold, it means that the tube temperature of the first heat exchanger obtained is lower than the actual temperature value due to uneven refrigerant diversion and refrigerant deposition. At this time, the speed of the external fan is not enough. Therefore, by controlling the current wind speed F of the external fan to increase, the speed of the external fan is increased, which helps to improve the heat exchange efficiency of the first heat exchanger and helps to reduce the exhaust pressure of the compressor, thereby helping to improve the situation where the system frequently experiences over-pressure protection.

[0013] In addition, the air conditioner control method according to the present application may also have the following additional technical features:

[0014] In some embodiments of the present application, the step of controlling to increase the current wind speed F of the external fan includes:

[0015] According to the current wind speed F of the external fan being the minimum wind speed Min F, controlling the current wind speed F to switch to the Min F+N speed;

[0016] Wherein, N is a natural number, and N≥1.

[0017] In some embodiments of the present application, the step of controlling to increase the current wind speed F of the external fan further includes:

[0018] According to the current wind speed F of the external fan being greater than the minimum wind speed Min F, the current wind speed F is controlled to be switched to the F+N speed.

[0019] In some embodiments of the present application, the air conditioner control method further includes:

[0020] Obtaining the ambient temperature of the environment in which the first heat exchanger is located;

[0021] According to the difference between the coil temperature of the first heat exchanger and the ambient temperature being less than a preset temperature difference, the external fan is controlled to operate at the switched wind speed.

[0022] In some embodiments of the present application, the air conditioner control method further includes:

[0023] obtaining the coil temperature of the first heat exchanger;

[0024] According to the coil temperature of the first heat exchanger being greater than or equal to the preset temperature threshold, the external fan is controlled to operate at the switched wind speed.

[0025] In some embodiments of the present application, the step of determining that the air conditioner is in an overpressure protection state includes:

[0026] Acquiring the exhaust pressure of the compressor, and determining that the air conditioner is in an overpressure protection state based on the exhaust pressure being greater than a preset pressure value;

[0027] Alternatively, the exhaust temperature of the compressor is obtained, and based on the exhaust temperature being greater than a preset exhaust temperature value, it is determined that the air conditioner is in an overpressure protection state.

[0028] In some embodiments of the present application, the value of N is negatively correlated with the ambient temperature of the first heat exchanger.

[0029] In a second aspect, the present application proposes a control device for an air conditioner, comprising: a memory and a processor, wherein the memory is configured to store a computer program, and when the computer program is executed by the processor, the steps of the air conditioner control method as described in any one of the embodiments of the first aspect are implemented.

[0030] In a third aspect, the present application proposes an air conditioner, comprising:

[0031] A compressor, a first heat exchanger, a throttling device and a second heat exchanger, wherein the compressor, the first heat exchanger, the throttling device and the second heat exchanger are sequentially connected to form a refrigerant circuit;

[0032] an external fan, disposed near the first heat exchanger;

[0033] a first temperature sensor, disposed near the first heat exchanger;

[0034] a second temperature sensor, provided on the first heat exchanger;

[0035] As in the control device of the air conditioner in the embodiment of the second aspect, the control device is electrically connected to the first temperature sensor, the second temperature sensor and the external fan, and is used to implement the control method of the air conditioner as in any one of the embodiments of the first aspect when executing a computer program.

[0036] In a fourth aspect, the present application proposes a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the air conditioner control method as described in any one of the embodiments of the first aspect is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0038] FIG1 schematically shows a structural diagram of an air conditioner provided according to some embodiments of the present application;

[0039] FIG2 schematically shows a block diagram of the structure of a control device for an air conditioner according to some embodiments of the present application;

[0040] FIG3 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present application;

[0041] FIG4 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present application;

[0042] FIG5 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present application;

[0043] FIG6 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present application;

[0044] FIG7 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present application;

[0045] The arrow direction in FIG1 indicates the flow direction of the refrigerant when the air conditioner is in the cooling state.

[0046] The reference numerals are as follows: 100, air conditioner; 200, control device; 10, outdoor unit; 20, indoor unit; 11, compressor; 12, first heat exchanger; 13, throttling device; 14, outdoor fan; 15, four-way reversing valve; 16, gas-liquid separator; 21, second heat exchanger. DETAILED DESCRIPTION

[0047] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0048] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0049] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0050] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0051] Please refer to Figures 1 and 2. In order to clearly describe the control method, device, air conditioner 100 and computer-readable storage medium of the air conditioner provided in this application, the air conditioner 100 provided in the third aspect of this application will be first explained in detail. According to the embodiment of the third aspect of this application, the air conditioner 100 includes a refrigerant circuit, an outdoor fan 14, a first temperature sensor, a second temperature sensor and a control device 200.

[0052] The refrigerant circuit is composed of a compressor 11, a first heat exchanger 12, a throttling device 13 and a second heat exchanger 21 which are connected in sequence.

[0053] The external fan 14 is arranged close to the first heat exchanger 12, the first temperature sensor is also arranged close to the first heat exchanger 12, the second temperature sensor is arranged in the first heat exchanger 12, and the control device 200 is the control device 200 described in the second embodiment.

[0054] The control device 200 is electrically connected to the first temperature sensor, the second temperature sensor and the outdoor fan 14, and is used to implement the control method of the air conditioner 100 as described in any one of the embodiments of the first aspect when executing a computer program.

[0055] In this embodiment, specifically, the compressor 11 , the first heat exchanger 12 and the throttling device 13 are provided in the outdoor unit 10 , and the first heat exchanger 12 is provided in the indoor unit 20 .

[0056] Exemplarily, the external fan 14 is an axial flow fan, and the control device 200 increases the rotation speed of the external fan 14 by controlling and increasing the operating power of the external fan 14 .

[0057] Exemplarily, the first heat exchanger 12 is a fin-tube heat exchanger, and the second temperature sensor is disposed near the bottom of the coil of the first heat exchanger 12 .

[0058] In addition, a pressure sensor or a third temperature sensor is provided at the outlet of the compressor 11 . The pressure sensor is used to detect the exhaust pressure of the compressor 11 , and the third temperature sensor is used to detect the exhaust temperature of the compressor 11 .

[0059] When the air conditioner 100 is in cooling mode and the air conditioner 100 is in overpressure protection state, the second temperature sensor detects the coil temperature of the first heat exchanger 12 and sends it to the control device 200. The control device 200 compares the received coil temperature of the first heat exchanger 12 with the preset temperature threshold to determine whether the first heat exchanger 12 has uneven refrigerant diversion and refrigerant deposition, resulting in the temperature of the first heat exchanger being inconsistent with the actual temperature, based on the comparison result, and then controls whether to correct the current wind speed of the external fan.

[0060] Specifically, if the coil temperature of the first heat exchanger 12 is greater than or equal to the preset temperature threshold, there is no need to switch or modify the current wind speed F of the external fan.

[0061] If the coil temperature of the first heat exchanger 12 is lower than the preset temperature threshold, it indicates that there is uneven refrigerant diversion and refrigerant deposition in the first heat exchanger 12. At this time, the actual temperature of the first heat exchanger 12 is higher than the temperature detected by the second heat exchanger 21, and the speed corresponding to the current wind speed F of the external fan 14 is relatively low. At this time, the control device 200 increases the current wind speed F of the external fan 14 by controlling to increase the speed of the external fan 14, thereby improving the heat exchange efficiency of the first heat exchanger 12, until the second temperature sensor detects that the coil temperature of the first heat exchanger 12 is higher than the preset temperature threshold.

[0062] Alternatively, until the difference between the coil temperature of the first heat exchanger 12 and the ambient temperature of the environment in which the first heat exchanger 12 is located detected by the first temperature sensor is less than the preset temperature difference, that is, the actual temperature of the first heat exchanger 12 is close to its ambient temperature, the over-pressure protection state of the air conditioner 100 can be released.

[0063] For example, the preset temperature difference may be set to a temperature value such as 0.5°C, 1°C, 1.5°C or 2°C.

[0064] Furthermore, the air conditioner 100 also includes a four-way reversing valve 15 and a gas-liquid separator 16, wherein the air outlet of the compressor 11 is connected to the A port of the four-way reversing valve 15, the first heat exchanger 12 is connected to the B port of the four-way reversing valve 15, the second heat exchanger 21 is connected to the C port of the four-way reversing valve 15, the inlet of the gas-liquid separator 16 is connected to the D port of the four-way reversing valve 15, and the outlet of the gas-liquid separator 16 is connected to the return air port of the compressor 11.

[0065] The following describes in detail the instructions stored in the computer-readable storage medium through a method for controlling an air conditioner according to the first aspect of the present application.

[0066] Referring to FIG. 3 , according to an embodiment of the first aspect of the present application, the first aspect of the present application provides a method for controlling an air conditioner, the method comprising:

[0067] Step S10: obtaining the operating mode of the air conditioner;

[0068] Step S20: According to the air conditioner being in cooling mode and in the overpressure protection state, obtaining the coil temperature of the first heat exchanger and the current wind speed F of the outdoor fan;

[0069] Step S30: According to the coil temperature of the first heat exchanger being lower than a preset temperature threshold, the current wind speed F of the outdoor fan is controlled to be increased.

[0070] In this embodiment, when the air conditioner is in cooling mode, the first heat exchanger is a condenser, an external fan is arranged near the first heat exchanger, the second heat exchanger is an evaporator, and an internal fan is arranged near the second heat exchanger. The refrigerant flow process in the air conditioner is as follows: the compressor pushes the high-temperature and high-pressure gaseous refrigerant to the first heat exchanger, and the refrigerant is converted into a high-temperature and high-pressure liquid refrigerant after heat release and condensation in the first heat exchanger. The high-temperature and high-pressure liquid refrigerant is throttled by the throttling device and its pressure is reduced. It then enters the second heat exchanger for evaporation and heat absorption, and flows back to the compressor after being converted into a low-temperature and low-pressure gaseous refrigerant.

[0071] Among them, under normal circumstances, the speed of the external fan matches the coil temperature of the first heat exchanger, that is, the higher the coil temperature of the first heat exchanger, the faster the speed of the external fan should be to improve the heat exchange efficiency of the first heat exchanger.

[0072] However, when the measured tube temperature of the first heat exchanger is lower than the actual temperature value or the theoretical temperature value due to uneven refrigerant distribution or refrigerant deposition, the speed of the external fan does not match the actual temperature value of the first heat exchanger, resulting in the air conditioner frequently entering the over-pressure protection state, which in turn affects the normal use of the air conditioner.

[0073] Therefore, the control method for the air conditioner provided in the embodiment of the first aspect of the present application, when it is obtained that the air conditioner is in cooling mode and the air conditioner is in a high-pressure protection state, obtains the coil temperature of the first heat exchanger and determines whether the coil temperature of the first heat exchanger is lower than the preset temperature threshold. If the coil temperature of the first heat exchanger is lower than the preset temperature threshold, it means that the obtained tube temperature of the first heat exchanger is lower than the actual temperature value due to uneven refrigerant diversion and refrigerant deposition. In other words, the speed of the external fan is insufficient at this time. Therefore, by controlling and increasing the current wind speed F of the external fan, the current speed of the external fan is increased, thereby helping to improve the heat exchange efficiency of the first heat exchanger and helping to reduce the exhaust pressure of the compressor, thereby helping to improve the situation where the air conditioner frequently encounters over-pressure protection.

[0074] Exemplarily, the preset temperature threshold may be any temperature value within the range of 30°C to 38°C.

[0075] Referring to FIG. 4 , according to some embodiments of the present application, the step of controlling the increase of the current wind speed F of the external fan includes:

[0076] Step S301: According to the current wind speed F of the outdoor fan being the minimum wind speed Min F, the minimum wind speed Min F is controlled to switch to the Min F+N level;

[0077] Wherein, N is a natural number, and N≥1.

[0078] In this embodiment, if the current wind speed F of the external fan is the minimum wind speed Min F, the minimum wind speed Min F is controlled to switch to Min F+N speed, and N is preferably any natural number from 1 to 3, so as to correct the minimum wind speed of the external fan, thereby increasing the speed of the external fan and improving the heat exchange efficiency of the first heat exchanger, thereby helping to reduce the exhaust pressure of the compressor and improve the situation where the air conditioner frequently experiences over-pressure protection.

[0079] Referring to FIG. 4 , according to some embodiments of the present application, the step of controlling the raising of the current wind speed F of the external fan further includes:

[0080] Step S302: According to the current wind speed F of the external fan being greater than the minimum wind speed Min F, the current wind speed F is controlled to be switched to the F+N speed.

[0081] In this embodiment, if the coil temperature of the first heat exchanger is lower than the preset temperature threshold, and the current wind speed of the external fan is the minimum wind speed Min F, the current wind speed F is controlled to switch to F+N to correct the current running wind speed of the external fan, that is, by increasing the speed of the external fan, the heat exchange efficiency of the first heat exchanger is improved to reduce the exhaust pressure of the compressor, thereby improving the situation where the air conditioner frequently encounters over-pressure protection.

[0082] According to some embodiments of the present application, the value of N is negatively correlated with the ambient temperature of the first heat exchanger.

[0083] In this embodiment, the lower the ambient temperature of the first heat exchanger, the easier it is for the refrigerant in the first heat exchanger to deposit at the bottom of its coil. Therefore, when the ambient temperature of the first heat exchanger is lower, the wind speed of the external fan is appropriately controlled to increase, which helps to improve the heat exchange efficiency of the refrigerant in the first heat exchanger.

[0084] For example, if the ambient temperature of the first heat exchanger is between 25°C and 35°C, N can be 1; if the ambient temperature is between 20°C and 25°C, N can be 2; if the ambient temperature is less than 20°C, N can be 3.

[0085] Referring to FIG. 5 , according to some embodiments of the present application, the air conditioner control method further includes:

[0086] Step S40: obtaining the ambient temperature of the environment in which the first heat exchanger is located;

[0087] Step S50: According to the difference between the coil temperature of the first heat exchanger and the ambient temperature being less than a preset temperature difference, the outdoor fan is controlled to operate at the switched wind speed.

[0088] In this embodiment, illustratively, the preset temperature difference may be a temperature value such as 0.5°C, 1°C, 1.5°C or 2°C.

[0089] When the difference between the coil temperature of the first heat exchanger and the ambient temperature of the environment in which it is located is less than the preset temperature difference, it means that after the operating wind speed of the external fan is corrected, the heat exchange efficiency of the refrigerant in the first heat exchanger is improved, that is, the refrigerant is no longer deposited at the bottom of the coil, and the coil temperature of the first heat exchanger has returned to the normal temperature value. At this time, the wind speed control of the external fan can be exited, and the external fan can continue to operate at the switched wind speed.

[0090] Referring to FIG. 6 , according to some embodiments of the present application, the air conditioner control method further includes:

[0091] Step S60: obtaining the coil temperature of the first heat exchanger;

[0092] Step S70: According to the coil temperature of the first heat exchanger being greater than a preset temperature threshold, the outdoor fan is controlled to operate at the switched wind speed.

[0093] In this embodiment, illustratively, the preset temperature threshold may be any temperature value within the range of 30° C. to 38° C.

[0094] By obtaining the coil temperature of the first heat exchanger in real time, when the coil temperature of the first heat exchanger is greater than the preset temperature threshold, the heat exchange efficiency of the refrigerant in the first heat exchanger is relatively high, the refrigerant in the coil of the first heat exchanger is no longer deposited at the bottom of the coil, and the coil temperature of the first heat exchanger has returned to a normal temperature value. At this time, the wind speed control of the external fan can be exited, and the external fan can continue to run at the switched wind speed.

[0095] According to some embodiments of the present application, the step of determining whether the air conditioner is in an overpressure protection state includes:

[0096] Get the exhaust pressure of the compressor;

[0097] According to the exhaust pressure being greater than the preset pressure value, it is determined that the air conditioner is in the over-pressure protection state;

[0098] Alternatively, the steps to determine if the air conditioner is in the overpressure protection state include:

[0099] Get the exhaust temperature of the compressor;

[0100] According to the exhaust temperature being greater than a preset exhaust temperature value, it is determined that the air conditioner is in an over-pressure protection state.

[0101] In this embodiment, whether the air conditioner is in the over-pressure protection state, that is, whether the system has overload protection action, can be determined by the exhaust pressure or exhaust temperature of the compressor. If the exhaust pressure of the compressor is greater than the preset pressure value, or the exhaust temperature of the compressor is greater than the preset exhaust temperature value, it means that the system pressure is too high, which will trigger the system overload protection action.

[0102] Referring to FIG. 7 , according to some embodiments of the present application, the present application provides a method for controlling an air conditioner, which is applicable to the air conditioner of the third embodiment. The method for controlling the air conditioner includes the following steps:

[0103] Get the operating mode of the air conditioner;

[0104] According to the air conditioner being in cooling mode and in the overpressure protection state, the coil temperature of the first heat exchanger and the current wind speed F of the outdoor fan are obtained;

[0105] According to the coil temperature of the first heat exchanger being lower than the preset temperature threshold and the current wind speed F of the external fan being the minimum wind speed Min F, the current wind speed F is controlled to be switched to the Min F+N speed;

[0106] According to the current wind speed F of the external fan being greater than the minimum wind speed Min F, the current wind speed is controlled to switch to the F+N speed;

[0107] According to the difference between the coil temperature of the first heat exchanger and the ambient temperature of the environment in which the first heat exchanger is located being less than a preset temperature difference, or the coil temperature of the first heat exchanger being greater than or equal to a preset temperature threshold, the outdoor fan is controlled to operate at the switched wind speed.

[0108] Referring to FIG. 2 , according to some embodiments of the present application, a second aspect of the present application provides an air conditioner control device 200, comprising a processor 210 and a memory 220. The memory 220 stores a computer program, which, when executed by the processor 210, implements the steps of the air conditioner control method according to any one of the embodiments of the first aspect.

[0109] According to some embodiments of the present application, the fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by the processor 210, a method for controlling an air conditioner as in any one of the embodiments of the first aspect is implemented.

[0110] In this embodiment, examples (non-exhaustive list) of computer-readable storage media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0111] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, devices (systems) or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0112] The present application is described with reference to the flow chart and / or block diagram of the method, device (system), and computer program product according to the embodiment of the present application. It should be understood that each flow process and / or box in the flow chart and / or block diagram and the combination of the flow process and / or box in the flow chart and / or block diagram can be realized by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processing machine or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for realizing the function specified in one flow chart flow or multiple flows and / or one box or multiple boxes of the block diagram.

[0113] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0115] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A control method for an air conditioner, the air conditioner comprising a refrigerant circuit formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, and an external fan arranged near the first heat exchanger, wherein: The control method of the air conditioner comprises: According to the air conditioner being in cooling mode and being in overpressure protection state, obtaining the coil temperature of the first heat exchanger and the current wind speed F of the external fan; According to the coil temperature of the first heat exchanger being lower than a preset temperature threshold, the current wind speed F of the external fan is controlled to be increased.

2. The control method of the air conditioner according to claim 1, wherein: The step of controlling to increase the current wind speed F of the external fan comprises: According to the current wind speed F of the external fan being the minimum wind speed Min F, controlling the minimum wind speed Min F to switch to Min F+N; Wherein, N is a natural number and N≥1.

3. The control method of the air conditioner according to claim 2, wherein: The step of controlling to increase the current wind speed F of the external fan further includes: According to the current wind speed F of the external fan being greater than the minimum wind speed Min F, the current wind speed F is controlled to be switched to the F+N speed.

4. The method for controlling an air conditioner according to any one of claims 1 to 3, wherein: The control method of the air conditioner also includes: Acquiring the ambient temperature of the first heat exchanger; According to the difference between the coil temperature of the first heat exchanger and the ambient temperature being less than a preset temperature difference, the external fan is controlled to operate at the switched wind speed.

5. The method for controlling an air conditioner according to any one of claims 1 to 3, wherein: The control method of the air conditioner also includes: Obtaining the coil temperature of the first heat exchanger; According to the coil temperature of the first heat exchanger being greater than the preset temperature threshold, the external fan is controlled to operate at the switched wind speed.

6. The method for controlling an air conditioner according to any one of claims 1 to 3, wherein: The step of determining that the air conditioner is in an overpressure protection state comprises: Acquiring the exhaust pressure of the compressor, and determining that the air conditioner is in an over-pressure protection state according to the exhaust pressure being greater than a preset pressure value; Alternatively, the exhaust temperature of the compressor is obtained, and based on the exhaust temperature being greater than a preset exhaust temperature value, it is determined that the air conditioner is in an overpressure protection state.

7. The control method of the air conditioner according to claim 2 or 3, wherein: The value of N is negatively correlated with the ambient temperature of the first heat exchanger.

8. A control device for an air conditioner, wherein: include: A memory and a processor, wherein the memory is configured to store a computer program, and when the computer program is executed by the processor, the steps of the air conditioner control method according to any one of claims 1 to 7 are implemented.

9. An air conditioner, wherein: include: A compressor, a first heat exchanger, a throttling device and a second heat exchanger, wherein the compressor, the first heat exchanger, the throttling device and the second heat exchanger are sequentially connected to form a refrigerant circuit; an external fan, arranged close to the first heat exchanger; A first temperature sensor is disposed close to the first heat exchanger; a second temperature sensor, disposed on the first heat exchanger; and The control device of the air conditioner as claimed in claim 8, wherein the control device is electrically connected to the first temperature sensor, the second temperature sensor and the external fan, and is used to implement the control method of the air conditioner as claimed in any one of claims 1 to 7 when executing a computer program.

10. A computer-readable storage medium, wherein: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the air conditioner according to any one of claims 1 to 7 is implemented.

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