Defrosting control method and device for air conditioner, electronic equipment and storage medium

Abstract

The present application relates to the air conditioning technical field, specifically provide a kind of defrosting control method, device, electronic equipment and storage medium for air conditioner, to solve the technical problem of the defrosting length of existing defrosting method is long.For this purpose, the defrosting control method for air conditioner of the present application, when air conditioner is operated in heating mode and after at least one defrosting operation, the method comprises: obtaining outdoor environment temperature, defrosting temperature and coil temperature;Based on outdoor environment temperature and defrosting temperature, control air conditioner enters defrosting mode;After defrosting preset time length, whether based on defrosting temperature and coil temperature judges control air conditioner exits defrosting mode;If not, then based on defrosting temperature and coil temperature control electronic expansion valve.Such, defrosting length is shortened, improves the defrosting efficiency of system, improves the use experience of user to air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and specifically provides a defrosting control method, device, electronic device, and storage medium for air conditioners. Background Technology

[0002] Currently, defrosting is a key concern for air conditioner manufacturers during product testing, as prolonged defrosting time can affect heating comfort.

[0003] In existing technologies, the defrost sensor is placed in the flow path most prone to frost formation. The system stops defrosting and the four-way valve reverses based on the temperature rise of the defrost sensor. Before the most unfavorable flow path finishes defrosting, other flow paths have already completed defrosting. In this case, the extended defrosting time is simply to wait for the most unfavorable flow path to finish defrosting. As a result, the defrosting time is prolonged, causing a large amount of heat to be wasted.

[0004] Accordingly, a new solution is needed in this field to address the aforementioned problems. Summary of the Invention

[0005] To overcome the aforementioned deficiencies, this invention is proposed to provide solutions or at least partially solve the above-mentioned technical problems. This invention provides a defrosting control method, apparatus, electronic device, and storage medium for an air conditioner.

[0006] In a first aspect, the present invention provides a defrosting control method for an air conditioner, the air conditioner including an outdoor unit, the outdoor unit including an electronic expansion valve, characterized in that, when the air conditioner is operating in heating mode and has undergone at least one defrosting operation, the method includes: acquiring an outdoor ambient temperature, a defrosting temperature, and a coil temperature; controlling the air conditioner to enter a defrosting mode based on the outdoor ambient temperature and the defrosting temperature; after a preset defrosting time, determining whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature; if not, controlling the electronic expansion valve based on the defrosting temperature and the coil temperature.

[0007] In one embodiment, the number of electronic expansion valves is N, and the air conditioner further includes an outdoor heat exchanger, which includes N branches, each branch including a heat exchanger and one of the electronic expansion valves, where 2≤N;

[0008] Obtaining the defrost temperature and the coil temperature includes: obtaining the defrost temperature in each branch of the outdoor heat exchanger by means of a defrost temperature sensor installed on the liquid collection pipe of the heat exchanger, and obtaining the coil temperature by means of a central temperature sensor installed in the middle of the heat exchanger.

[0009] In one embodiment, controlling the air conditioner to enter defrost mode based on the outdoor ambient temperature and the defrost temperature includes: controlling the air conditioner to enter defrost mode when the outdoor ambient temperature is less than a first temperature threshold and the defrost temperature of each branch is less than a second temperature threshold.

[0010] In one embodiment, determining whether to control the air conditioner to exit the defrost mode based on the defrost temperature and the coil temperature includes: controlling the air conditioner to exit the defrost mode when the defrost temperature of each branch is greater than a third temperature threshold and the coil temperature of each branch is greater than a fourth temperature threshold.

[0011] In one embodiment, controlling the electronic expansion valve based on the defrost temperature and the coil temperature includes: determining the sum of the defrost temperature and the coil temperature in each branch; and controlling the opening degree of the electronic expansion valve in each branch based on the sum of the temperatures in each branch.

[0012] In one embodiment, controlling the opening degree of the electronic expansion valve of the branch based on the sum of the temperatures of each branch includes: sorting the sum of the temperatures of all branches; and, according to the sorting result, controlling the opening degree of the electronic expansion valve of the branch to be smaller when the sum of the temperatures of the branches is larger.

[0013] In one embodiment, when the air conditioner enters the defrost mode, the method further includes: reversing the four-way valve of the air conditioner to control the air conditioner to switch from heating mode to cooling mode, and controlling the fan of the outdoor unit to reverse at a preset speed.

[0014] In a second aspect, the present invention provides a defrosting control device for an air conditioner, the air conditioner including an outdoor unit, the outdoor unit including an electronic expansion valve, characterized in that, when the air conditioner is operating in heating mode and has undergone at least one defrosting operation, the device includes:

[0015] The acquisition module is configured to acquire the outdoor ambient temperature, defrost temperature, and coil temperature.

[0016] The first control module is configured to control the air conditioner to enter the defrost mode based on the outdoor ambient temperature and the defrost temperature.

[0017] The judgment module is configured to determine, after a preset defrosting time, whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature.

[0018] The second control module is configured to control the electronic expansion valve based on the defrost temperature and the coil temperature without exiting the defrost mode.

[0019] In a third aspect, an electronic device is provided, comprising at least one processor and at least one storage device, the storage device being adapted to store a plurality of program codes adapted to be loaded and executed by the processor to perform the defrosting control method described in any of the preceding claims.

[0020] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, the program codes being adapted to be loaded and executed by a processor to perform the defrosting control method described in any of the preceding claims.

[0021] The above-described technical solutions of the present invention have at least one or more of the following beneficial effects:

[0022] The defrosting control method for air conditioners in this invention first acquires the outdoor ambient temperature, defrosting temperature, and coil temperature; based on the outdoor ambient temperature and defrosting temperature, it controls the air conditioner to enter defrosting mode; after a preset defrosting time, it determines whether to control the air conditioner to exit defrosting mode based on the defrosting temperature and coil temperature; if not, it controls the electronic expansion valve based on the defrosting temperature and coil temperature. In this way, the electronic expansion valve can be controlled according to the defrosting temperature and coil temperature of the branch circuit, thereby increasing the defrosting rate of the slower defrosting branch circuit, shortening the defrosting time, improving the defrosting efficiency of the system, and enhancing the user experience of the air conditioner. Attached Figure Description

[0023] The disclosure of this invention will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0024] Figure 1 This is a schematic flowchart of the main steps of a defrosting control method for an air conditioner according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the outdoor unit of an air conditioner in one embodiment;

[0026] Figure 3 This is a schematic diagram of the heat exchanger in one embodiment;

[0027] Figure 4 This is a complete schematic diagram of a defrosting control method for an air conditioner in one embodiment;

[0028] Figure 5 This is a schematic diagram of the main structure of a defrosting control device for an air conditioner according to an embodiment of the present invention;

[0029] Figure 6This is a schematic diagram of the structure of an electronic device in one embodiment.

[0030] List of reference numerals :

[0031] 1: Compressor; 2: High pressure sensor; 3: Oil separator; 4: Four-way valve; 5: Outdoor heat exchanger; 51: Heat exchanger; 511: Liquid collection pipe; 512: Defrost temperature sensor; 513: Middle temperature sensor; 6: Gas collection temperature sensor; 7: Gas-liquid separator; 8: Low pressure sensor; 9: Return gas temperature sensor. Detailed Implementation

[0032] Some embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] In the description of this invention, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0034] In traditional defrosting control methods, defrosting sensors are placed in the flow paths most prone to frost formation. The system stops defrosting and the four-way valve reverses based on the temperature rise of the defrosting sensor. However, before the most unfavorable flow path finishes defrosting, other flow paths have already completed defrosting. In this case, the extended defrosting time is simply due to waiting for the most unfavorable flow path to finish defrosting, resulting in a significant waste of heat.

[0035] Therefore, this application proposes a defrosting control method, device, electronic equipment, and storage medium for air conditioners. When the air conditioner is operating in heating mode and has undergone at least one defrosting operation, the following steps are taken: First, the outdoor ambient temperature, defrosting temperature, and coil temperature are acquired. Based on the outdoor ambient temperature and defrosting temperature, the air conditioner is controlled to enter defrosting mode. After a preset defrosting time, based on the defrosting temperature and coil temperature, it is determined whether to control the air conditioner to exit defrosting mode. If not, the electronic expansion valve is controlled based on the defrosting temperature and coil temperature. In this way, the electronic expansion valve can be controlled according to the defrosting temperature and coil temperature of the branch circuit, thereby increasing the defrosting rate of the slower-defrosting branch circuit, shortening the defrosting time, improving the defrosting efficiency of the system, and enhancing the user experience of the air conditioner.

[0036] See appendix Figure 1 , Figure 1 This is a schematic flowchart of the main steps of a defrosting control method for an air conditioner according to an embodiment of the present invention. The air conditioner includes an outdoor unit, which includes an electronic expansion valve. When the air conditioner is operating in heating mode and has undergone at least one defrosting operation, as... Figure 1 As shown, the defrosting control method for air conditioners in this embodiment of the invention mainly includes the following steps S101-S104.

[0037] Step S101: Obtain the outdoor ambient temperature, defrost temperature, and coil temperature.

[0038] Step S102: Based on the outdoor ambient temperature and the defrost temperature, control the air conditioner to enter defrost mode.

[0039] Step S103: After the preset defrosting time, determine whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature.

[0040] Step S104: If not, control the electronic expansion valve based on the defrost temperature and the coil temperature.

[0041] Based on steps S101-S104 above, the outdoor ambient temperature, defrost temperature, and coil temperature are first acquired. The air conditioner is then controlled to enter defrost mode based on the outdoor ambient temperature and defrost temperature. After a preset defrost time, it is determined whether to control the air conditioner to exit defrost mode based on the defrost temperature and coil temperature. If not, the electronic expansion valve is controlled based on the defrost temperature and coil temperature. In this way, the electronic expansion valve can be controlled according to the defrost temperature and coil temperature of the branch circuit to improve the defrost rate of the slower defrosting branch, shorten the defrost time, improve the defrost efficiency of the system, and enhance the user experience of the air conditioner.

[0042] The following provides further explanation of steps S101 to S104.

[0043] First, a detailed explanation of step S101 above will be provided.

[0044] In one specific embodiment, the number of electronic expansion valves is N, and the air conditioner further includes an outdoor heat exchanger, which includes N branches, each branch including a heat exchanger and one of the electronic expansion valves, where 2≤N;

[0045] Obtaining the defrost temperature and the coil temperature includes: obtaining the defrost temperature in each branch of the outdoor heat exchanger by means of a defrost temperature sensor installed on the liquid collection pipe of the heat exchanger, and obtaining the coil temperature by means of a central temperature sensor installed in the middle of the heat exchanger.

[0046] For example, such as Figure 2 The outdoor unit shown is an example of an outdoor unit for an air conditioner, but is not limited to this. Figure 2 As shown, the outdoor heat exchanger includes multiple branches, each branch including a heat exchanger 51 and an electronic expansion valve LEVA, with each electronic expansion valve controlling one heat exchanger individually.

[0047] In one embodiment, Figure 3 The heat exchanger structure can be one embodiment of heat exchanger 51, but is not limited thereto. Specifically, it can be... Figure 3 A defrost temperature sensor 512 is installed on the liquid collection pipe 511 of the heat exchanger 51 shown, and a central temperature sensor 513 is installed in the middle of the coil of the heat exchanger 51. The defrost temperature of each branch is obtained through the defrost temperature sensor 512, and the coil temperature of each branch is obtained through the central temperature sensor 513.

[0048] The above is a further explanation of step S101. The following is a further explanation of step S102.

[0049] In one specific embodiment, controlling the air conditioner to enter the defrost mode based on the outdoor ambient temperature and the defrost temperature includes: controlling the air conditioner to enter the defrost mode when the outdoor ambient temperature is less than a first temperature threshold and the defrost temperature of each branch is less than a second temperature threshold.

[0050] The first and second temperature thresholds can be values ​​obtained in advance through experiments.

[0051] Specifically, by judging the collected outdoor ambient temperature and the defrost temperature of each branch circuit, if the outdoor ambient temperature is lower than a first temperature threshold and the defrost temperature of each branch circuit is lower than a second temperature threshold, the defrost conditions of the air conditioner are met, and the air conditioner is controlled to enter defrost mode. In this way, based on the outdoor ambient temperature and the defrost temperature of each branch circuit, it is possible to accurately determine whether to control the air conditioner to enter defrost control mode.

[0052] In another embodiment, when the air conditioner enters the defrost mode, the method further includes: reversing the four-way valve of the air conditioner to control the air conditioner to switch from heating mode to cooling mode, and controlling the outdoor unit's fan to reverse at a preset speed. Thus, by reversing the four-way valve when entering defrost mode, the air conditioner switches from heating mode to cooling mode, further improving the defrost effect. Additionally, controlling the outdoor unit's fan to reverse at a preset speed prevents excessive heat loss from the outdoor fan section, allowing the heat to reheat the heat exchanger, thereby improving the defrost effect.

[0053] The above is a further explanation of step S102. The following is a further explanation of step S103.

[0054] In one specific implementation, determining whether to control the air conditioner to exit the defrost mode based on the defrost temperature and the coil temperature includes: controlling the air conditioner to exit the defrost mode when the defrost temperature of each branch is greater than a third temperature threshold and the coil temperature of each branch is greater than a fourth temperature threshold.

[0055] Specifically, the system determines whether to exit defrost mode by measuring the defrost temperature and coil temperature of each branch circuit. Specifically, if the defrost temperature of each branch circuit exceeds a third temperature threshold and the coil temperature of each branch circuit exceeds a fourth temperature threshold, it indicates that defrosting of each branch circuit is complete, and the air conditioner is controlled to exit defrost mode. Thus, based on the defrost temperature and coil temperature of each branch circuit, the system can accurately determine whether to control the air conditioner to exit defrost mode.

[0056] The above is a further explanation of step S103. The following is a further explanation of step S104.

[0057] In one specific embodiment, controlling the electronic expansion valve based on the defrost temperature and the coil temperature includes: determining the sum of the defrost temperature and the coil temperature in each branch; and controlling the opening degree of the electronic expansion valve in each branch based on the sum of the temperatures in each branch.

[0058] Specifically, the sum of the defrosting temperature and the coil temperature in each branch is first calculated, and then the opening of the electronic expansion valve of that branch is controlled based on the sum of the temperatures.

[0059] There are many ways to control the opening degree of an electronic expansion valve based on temperature. In this specific embodiment, the opening degree of the electronic expansion valve is controlled by the following method.

[0060] In one specific embodiment, controlling the opening degree of the electronic expansion valve of the branch based on the sum of the temperatures of each branch includes: sorting the sum of the temperatures of all branches; and according to the sorting result, controlling the opening degree of the electronic expansion valve of the branch to be smaller when the sum of the temperatures of the branches is larger.

[0061] Specifically, the sum of the defrost temperature and the coil temperature in all branches is first sorted. Based on this sorting, the opening of the electronic expansion valve in each branch is adjusted: the higher the sum of the defrost temperature and the coil temperature in a branch, the smaller the opening of the electronic expansion valve for that branch. In this way, the opening of the electronic expansion valve is adjusted in real time according to the sum of the defrost temperature and the coil temperature. For branches with slower defrosting speeds, the opening of the electronic expansion valve in that branch is increased, thereby improving the defrosting efficiency of that branch and further shortening the overall defrosting time, thus improving the defrosting efficiency of the system.

[0062] In addition, such as Figure 4 As shown, the step of "controlling the opening of the electronic expansion valve based on the defrost temperature and coil temperature" can be performed according to a preset time interval, such as once every 30 seconds. After defrosting of the corresponding branch is completed, the electronic expansion valve of that branch is controlled to be fixed at the minimum opening, thereby reducing the system pressure. The minimum opening can be a value obtained in advance through experiments. After defrosting is completed, the four-way valve is controlled to switch, controlling the air conditioner to switch from cooling mode to heating mode.

[0063] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of the present invention.

[0064] Furthermore, the present invention also provides a defrosting control device for an air conditioner.

[0065] See appendix Figure 5 , Figure 5 This is a main structural block diagram of a defrosting control device for an air conditioner according to an embodiment of the present invention.

[0066] like Figure 5 As shown, the defrosting control device for an air conditioner in this embodiment of the invention mainly includes an acquisition module 100, a first control module 200, a judgment module 300, and a second control module 400. In some embodiments, one or more of the acquisition module 100, the first control module 200, the judgment module 300, and the second control module 400 can be combined into a single module.

[0067] In some embodiments, the acquisition module 100 can be configured to acquire the outdoor ambient temperature, defrost temperature, and coil temperature.

[0068] The first control module 200 can be configured to control the air conditioner to enter the defrost mode based on the outdoor ambient temperature and the defrost temperature.

[0069] The judgment module 300 can be configured to determine whether to control the air conditioner to exit the defrost mode based on the defrost temperature and the coil temperature after a preset defrost time.

[0070] The second control module 400 can be configured to control the electronic expansion valve based on the defrost temperature and the coil temperature without exiting the defrost mode.

[0071] In one implementation, a description of the specific functions can be found in steps S101-S104.

[0072] The above-mentioned defrosting control device for air conditioners is used to perform... Figure 1 The embodiments of the defrosting control method for air conditioners shown are similar in technical principle, the technical problems solved, and the technical effects produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the defrosting control device for air conditioners can be found in the embodiments of the defrosting control method for air conditioners, and will not be repeated here.

[0073] Those skilled in the art will understand that all or part of the processes in the method of the above embodiment of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0074] Furthermore, the present invention also provides an electronic device. In one embodiment of the electronic device according to the present invention, such as Figure 6As shown, the electronic device includes at least one processor 61 and at least one storage device 62. The storage device 62 can be configured to store a program for executing the defrosting control method for an air conditioner according to the above-described method embodiments. The processor 61 can be configured to execute the program in the storage device 62, which includes, but is not limited to, the program for executing the defrosting control method for an air conditioner according to the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of the present invention are shown. For specific technical details not disclosed, please refer to the method section of the embodiments of the present invention.

[0075] In embodiments of the present invention, the electronic device may be a control device comprising various devices. In some possible implementations, the electronic device may include multiple storage devices and multiple processors. The program executing the defrosting control method for an air conditioner according to the above method embodiments may be divided into multiple subroutines, each subroutine being loaded and run by a processor to execute different steps of the defrosting control method for an air conditioner according to the above method embodiments. Specifically, each subroutine may be stored in different storage devices, and each processor may be configured to execute programs in one or more storage devices to jointly implement the defrosting control method for an air conditioner according to the above method embodiments, that is, each processor executes different steps of the defrosting control method for an air conditioner according to the above method embodiments to jointly implement the defrosting control method for an air conditioner according to the above method embodiments.

[0076] The aforementioned multiple processors can be processors deployed on the same device. For example, the aforementioned electronic device can be a high-performance device composed of multiple processors, and the aforementioned multiple processors can be processors configured on that high-performance device. Alternatively, the aforementioned multiple processors can also be processors deployed on different devices. For example, the aforementioned electronic device can be a server cluster, and the aforementioned multiple processors can be processors on different servers within the server cluster.

[0077] Furthermore, the present invention also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to the present invention, the computer-readable storage medium can be configured to store a program for performing the defrosting control method for an air conditioner described in the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described defrosting control method for an air conditioner. For ease of explanation, only the parts related to the embodiments of the present invention are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of the present invention. The computer-readable storage medium can be a storage device comprising various electronic devices. Optionally, in the embodiments of the present invention, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0078] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of software and hardware. Therefore, the number of modules shown in the figures is merely illustrative.

[0079] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of the present invention; therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.

[0080] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A defrosting control method for an air conditioner, the air conditioner including an outdoor unit, the outdoor unit including an electronic expansion valve, characterized by, When the air conditioner is running in a heating mode and has undergone at least one defrosting operation, the method comprises: obtaining an outdoor environment temperature, a defrosting temperature and a coil temperature; the number of the electronic expansion valves is N, the air conditioner further comprises an outdoor heat exchanger, the outdoor heat exchanger comprises N branches, each branch comprises a heat exchanger and an electronic expansion valve, and 2≤N; obtaining the defrosting temperature and the coil temperature comprises: in each branch of the outdoor heat exchanger, the defrosting temperature is obtained by a defrosting temperature sensor arranged on a collecting tube of the heat exchanger, and the coil temperature is obtained by a middle temperature sensor arranged at a middle position of the heat exchanger; controlling the air conditioner to enter a defrosting mode based on the outdoor environment temperature and the defrosting temperature; after a preset defrosting time, judging whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature; if not, controlling the electronic expansion valves based on the defrosting temperature and the coil temperature, comprising: determining a temperature sum of the defrosting temperature and the coil temperature in each branch; controlling the opening degree of the electronic expansion valve of each branch based on the temperature sum of each branch.

2. The defrosting control method according to claim 1, characterized by, controlling the air conditioner to enter the defrosting mode based on the outdoor environment temperature and the defrosting temperature comprises: in the case that the outdoor environment temperature is less than a first temperature threshold value and the defrosting temperature of each branch is less than a second temperature threshold value, controlling the air conditioner to enter the defrosting mode.

3. The defrosting control method according to claim 1, characterized by, judging whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature comprises: in the case that the defrosting temperature of each branch is greater than a third temperature threshold value and the coil temperature of each branch is greater than a fourth temperature threshold value, controlling the air conditioner to exit the defrosting mode.

4. The defrosting control method according to claim 1, characterized by, controlling the opening degree of the electronic expansion valve of each branch based on the temperature sum of each branch comprises: sorting the temperature sums of all branches; according to the sorting result, the opening degree of the electronic expansion valve of each branch is controlled to be smaller in the case that the temperature sum of the branch is greater.

5. The defrosting control method according to claim 1, characterized by, When the air conditioner enters the defrosting mode, the method further comprises: reversing a four-way valve of the air conditioner, controlling the air conditioner to switch from the heating mode to the cooling mode, and controlling a fan of the outdoor unit to reverse at a preset rotating speed.

6. A defrosting control apparatus for an air conditioner, the air conditioner including an outdoor unit, the outdoor unit including an electronic expansion valve, characterized by, When the air conditioner is running in a heating mode and has undergone at least one defrosting operation, the device comprises: an obtaining module configured to obtain an outdoor environment temperature, a defrosting temperature and a coil temperature, the number of the electronic expansion valves is N, the air conditioner further comprises an outdoor heat exchanger, the outdoor heat exchanger comprises N branches, each branch comprises a heat exchanger and an electronic expansion valve, and 2≤N; obtaining the defrosting temperature and the coil temperature comprises: in each branch of the outdoor heat exchanger, the defrosting temperature is obtained by a defrosting temperature sensor arranged on a collecting tube of the heat exchanger, and the coil temperature is obtained by a middle temperature sensor arranged at a middle position of the heat exchanger; A first control module is configured to control the air conditioner to enter a defrosting mode based on the outdoor environment temperature and the defrosting temperature; A judgment module is configured to judge whether to control the air conditioner to exit the defrosting mode based on the defrosting temperature and the coil temperature after a preset defrosting time; A second control module is configured to control the electronic expansion valve based on the defrosting temperature and the coil temperature without exiting the defrosting mode, including: determining a temperature sum of the defrosting temperature and the coil temperature in each branch; and controlling the opening degree of the electronic expansion valve of the branch based on the temperature sum of each branch.

7. An electronic device comprising at least one processor and at least one storage device adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the defrosting control method of any one of claims 1 to 5.

8. A computer readable storage medium having stored therein a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the defrosting control method of any one of claims 1 to 5.

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