Control method, system, device and medium of multi-split air conditioner

Abstract

The present invention relates to the field of air conditioning control technology, and specifically provides a control method, system, device and medium for a multi-split air conditioner, aiming to solve the problem of how to ensure the overall function of the multi-split air conditioner to the greatest extent to improve the user experience after the indoor unit in the multi-split air conditioner is powered off due to abnormal reasons. To this end, when the present invention detects that there is a power-off indoor unit in the multi-split air conditioner, the multi-split air conditioner can be controlled according to the proportion of the number of power-off indoor units to the total number of indoor units. The situation in which the entire multi-split air conditioning system is shut down due to power outages of a small number of indoor units is avoided, and the cooling and heating functions and effects of the multi-split air conditioner can be retained to the greatest extent before after-sales maintenance, thereby ensuring the overall function of the multi-split air conditioner to a greater extent, improving the fault tolerance of the multi-split air conditioner, and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and specifically provides a control method, system, device and medium for a multi-split air conditioner. Background Art

[0002] Nowadays, multi-split air conditioners are more and more widely used. However, with the increase in application scenarios, consumers' functional requirements for multi-split air conditioners are also increasing. Especially in terms of emergency operation, when one or several indoor units of a multi-split air conditioner lose power due to abnormal reasons, the entire multi-split air conditioner system will usually report a fault and shut down. This will reduce the fault tolerance of the entire multi-split air conditioner system, and cannot ensure the cooling and heating functions of the multi-split air conditioner, reducing the user experience.

[0003] Accordingly, the art needs a new control solution for multi-split air conditioners to solve the above problems. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention is proposed to provide a solution or at least partially solve the problem of how to ensure the overall function of the multi-split air conditioner to the greatest extent and ensure the normal operation of the multi-split air conditioner to improve the user experience after the indoor unit of the multi-split air conditioner loses power due to an abnormal reason.

[0005] In a first aspect, the present invention provides a control method for a multi-split air conditioner, wherein the multi-split air conditioner includes a plurality of indoor units, and the method includes:

[0006] When it is detected that there is a power-off indoor unit, the number of the power-off indoor units is obtained;

[0007] The multi-split air conditioner is controlled according to the proportion of the number of indoor units that are powered off to the total number of indoor units.

[0008] In a technical solution of the control method of the multi-split air conditioner, the step of "controlling the multi-split air conditioner according to the proportion of the number of indoor units that are powered off to the total number of indoor units" includes:

[0009] comparing the specific gravity with a preset specific gravity threshold;

[0010] If the proportion is less than or equal to the proportion threshold, the multi-split air conditioner is controlled according to the working state of the indoor unit that is powered off before the power failure;

[0011] If the specific gravity is greater than the specific gravity threshold, the multi-split air conditioner is controlled to shut down.

[0012] In a technical solution of the control method of the multi-split air conditioner, the step of "controlling the multi-split air conditioner according to the working state of the indoor unit before the power failure" includes:

[0013] For each indoor unit that is powered off, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the power outage;

[0014] The multi-split air conditioner is controlled according to the status judgment result.

[0015] In a technical solution of the control method of the multi-split air conditioner, the multi-split air conditioner further includes an outdoor unit connected to a plurality of indoor units, the working state includes a standby state, a heating state, and a cooling state, the state judgment result includes a first judgment result, and the step of "obtaining the state judgment result of the indoor unit according to the working state of the indoor unit before power failure" includes:

[0016] If the working state of the indoor unit before power failure is a standby state, determining the state judgment result to be a first judgment result;

[0017] If the working state of the indoor unit before power failure is a heating state, obtaining a state judgment result of the indoor unit according to the exhaust pressure of the compressor of the outdoor unit;

[0018] If the working state of the indoor unit that is powered off before the power failure is a cooling state, the state judgment result of the indoor unit is obtained according to the opening degree of the electronic expansion valve of the indoor unit that is powered off before the power failure.

[0019] In a technical solution of the control method of the multi-split air conditioner, the state judgment result includes a second judgment result, and the step of "obtaining the state judgment result of the indoor unit according to the exhaust pressure of the compressor of the outdoor unit" includes:

[0020] Regularly detecting the exhaust pressure of the compressor;

[0021] If the exhaust pressure is less than or equal to a preset pressure threshold, determining that the state judgment result is a first judgment result;

[0022] If the exhaust pressure is greater than the pressure threshold, determining that the state judgment result is a second judgment result; and / or,

[0023] The step of “obtaining a state judgment result of the indoor unit according to the opening degree of the electronic expansion valve of the indoor unit before the power failure” includes:

[0024] comparing the opening degree of the electronic expansion valve of the indoor unit that is powered off before the power failure with a preset opening degree threshold;

[0025] If the opening degree is less than or equal to the opening degree threshold, obtaining a state judgment result of the indoor unit according to the exhaust gas superheat of the compressor of the outdoor unit;

[0026] If the opening degree is greater than the opening degree threshold, the state judgment result is determined to be a second judgment result.

[0027] In a technical solution of the control method of the multi-split air conditioner, the step of "obtaining the state judgment result of the indoor unit according to the exhaust gas superheat of the compressor of the outdoor unit" includes:

[0028] comparing the exhaust superheat of the compressor with a preset superheat threshold;

[0029] If the exhaust gas superheat is greater than or equal to the superheat threshold, determining that the state judgment result is a first judgment result;

[0030] If the exhaust gas superheat degree is less than the superheat degree threshold, the state judgment result is determined to be a second judgment result.

[0031] In a technical solution of the above-mentioned method for controlling the multi-split air conditioner, the step of "controlling the multi-split air conditioner according to the state judgment result" includes:

[0032] When the state judgment results of the indoor units that are powered off are all the first judgment results, controlling the outdoor units to operate according to the current mode;

[0033] When the state judgment result of at least one indoor unit that is powered off is the second judgment result, the multi-split air conditioner is controlled to shut down.

[0034] In a second aspect, the present invention provides a control system for a multi-split air conditioner, wherein the multi-split air conditioner includes a plurality of indoor units, and the system includes:

[0035] A power-off indoor unit number acquisition module, configured to acquire the number of the power-off indoor units when detecting the presence of the power-off indoor units;

[0036] The multi-split air conditioner control module is configured to control the multi-split air conditioner according to the proportion of the number of indoor units that are powered off to the total number of indoor units.

[0037] In a third aspect, a control device is provided, which includes a processor and a storage device, wherein the storage device is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the control method of the multi-split air conditioner described in any one of the technical solutions of the above-mentioned technical solutions of the control method of the multi-split air conditioner.

[0038] In a fourth aspect, a computer-readable storage medium is provided, which stores a plurality of program codes, wherein the program codes are suitable for being loaded and run by a processor to execute the control method of the multi-split air conditioner described in any one of the technical solutions of the above-mentioned technical solutions of the control method of the multi-split air conditioner.

[0039] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0040] In the technical solution of the present invention, when the present invention detects that there are power-off indoor units in the multi-split air conditioner, the multi-split air conditioner can be controlled according to the proportion of the number of power-off indoor units to the total number of indoor units. Through the above configuration, the present invention can still achieve the normal operation of the multi-split air conditioner after a small number of indoor units in the multi-split air conditioner are powered off, avoiding the situation where the entire multi-split air conditioner system is shut down due to power off of a small number of indoor units, and can retain the cooling and heating functions and effects of the multi-split air conditioner to the greatest extent before after-sales maintenance, thereby ensuring the overall function of the multi-split air conditioner to a greater extent, improving the fault tolerance of the multi-split air conditioner, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. Among them:

[0042] Figure 1 is a flow chart of main steps of a method for controlling a multi-split air conditioner according to an embodiment of the present invention;

[0043] Figure 2 is a flow chart of main steps of a method for controlling a multi-split air conditioner according to an implementation of an embodiment of the present invention;

[0044] Figure 3 It is a schematic diagram of the main structural block diagram of a control system of a multi-split air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. 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 term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0047] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart showing the main steps of a method for controlling a multi-split air conditioner according to an embodiment of the present invention. Figure 1 As shown, in the embodiment of the present invention, the multi-split air conditioner includes a plurality of indoor units, and the control method of the multi-split air conditioner mainly includes the following steps S101 to S102.

[0048] Step S101: when it is detected that there is a power-off indoor unit, the number of the power-off indoor units is obtained.

[0049] In this embodiment, when it is detected that there are indoor units with abnormal power failure in the multi-split air conditioner, the number of the indoor units with abnormal power failure can be obtained.

[0050] In one implementation, the cause of abnormal power failure of the indoor unit includes, but is not limited to, damage to components in a main control board of the indoor unit, failure of a power supply that supplies power to the indoor unit, and the like.

[0051] In one implementation, the number of indoor units that are powered off may be acquired through an outdoor unit detection system of the multi-split air conditioner.

[0052] Step S102: Control the multi-split air conditioner according to the ratio of the number of indoor units that are powered off to the total number of indoor units.

[0053] In this embodiment, the multi-split air conditioner can be controlled according to the ratio of the number of indoor units that are actually powered off to the total number of indoor units.

[0054] Based on the above steps S101-S102, when the embodiment of the present invention detects that there are powered-off indoor units in the multi-split air conditioner, the multi-split air conditioner can be controlled according to the proportion of the number of powered-off indoor units to the total number of indoor units. Through the above configuration, the embodiment of the present invention can still achieve the normal operation of the multi-split air conditioner after a small number of indoor units in the multi-split air conditioner are powered off, avoiding the situation where the entire multi-split air conditioner system is shut down due to power outages of a small number of indoor units, and can retain the cooling and heating functions and effects of the multi-split air conditioner to the greatest extent before after-sales maintenance, thereby ensuring the overall function of the multi-split air conditioner to a greater extent, improving the fault tolerance of the multi-split air conditioner, and improving the user experience.

[0055] The step S102 is further described below.

[0056] In one implementation of the embodiment of the present invention, step S102 may include the following steps S1021 to S1023:

[0057] Step S1021: Compare the specific gravity with a preset specific gravity threshold.

[0058] In this implementation, the proportion of the indoor units that are powered off to the total number of indoor units may be compared with a preset proportion threshold.

[0059] Step S1022: If the specific gravity is less than or equal to the specific gravity threshold, the multi-split air conditioner is controlled according to the working state of the indoor unit that is powered off before the power failure.

[0060] In this implementation, step S1022 may further include the following steps S10221 and S10222:

[0061] Step S10221: For each indoor unit that is powered off, obtain a status judgment result of the indoor unit according to the working status of the indoor unit before the power outage.

[0062] In this embodiment, the multi-split air conditioner may further include an outdoor unit connected to the plurality of indoor units, the working state may include a standby state, a heating state, and a cooling state, the state judgment result may include a first judgment result, and step S10221 may further include the following steps S102211 to S102213:

[0063] Step S102211: If the working state of the indoor unit before power failure is the standby state, the state judgment result is determined to be the first judgment result.

[0064] In this embodiment, if the working state of the indoor unit that is powered off is the standby state before the power failure, the state judgment result of the indoor unit is the first judgment result.

[0065] In one embodiment, the standby state may include a heating standby state and a cooling standby state.

[0066] Step S102212: If the working state of the indoor unit before the power failure is the heating state, the state judgment result of the indoor unit is obtained according to the exhaust pressure of the compressor of the outdoor unit.

[0067] In this embodiment, the state judgment result may further include a second judgment result, and step S102212 may further include the following steps S1022121 and S1022123:

[0068] Step S1022121: Regularly detect the exhaust pressure of the compressor.

[0069] Step S1022122: If the exhaust pressure is less than or equal to the preset pressure threshold, the state judgment result is determined to be the first judgment result.

[0070] Step S1022123: If the exhaust pressure is greater than the pressure threshold, the state judgment result is determined to be the second judgment result.

[0071] Step S102213: If the working state of the indoor unit that is powered off before the power failure is the cooling state, the state judgment result of the indoor unit is obtained according to the opening degree of the electronic expansion valve of the indoor unit that is powered off before the power failure.

[0072] In this implementation, step S102213 may further include the following steps S1022131 to S1022133:

[0073] Step S1022131: Compare the opening degree of the electronic expansion valve of the indoor unit that is powered off before the power failure with a preset opening degree threshold.

[0074] Step S1022132: If the opening degree is less than or equal to the opening degree threshold, the state judgment result of the indoor unit is obtained according to the exhaust gas superheat of the compressor of the outdoor unit.

[0075] Step S1022133: If the opening degree is greater than the opening degree threshold, the state judgment result is determined to be the second judgment result.

[0076] In this implementation, step S1022132 may further include step S10221321 and step S10221323:

[0077] Step S10221321: Compare the exhaust superheat of the compressor with a preset superheat threshold.

[0078] Step S10221322: If the exhaust superheat is greater than or equal to the superheat threshold, the state judgment result is determined to be the first judgment result.

[0079] Step S10221323: If the exhaust superheat is less than the superheat threshold, the state judgment result is determined to be the second judgment result.

[0080] Step S10222: Control the multi-split air conditioner according to the status judgment result.

[0081] In this implementation, step S10222 may further include the following steps S102221 and S102222:

[0082] Step S102221: When the status judgment results of the indoor units that are powered off are all the first judgment results, the outdoor units are controlled to operate according to the current mode.

[0083] Step S102222: When the status judgment result of at least one indoor unit that is powered off is the second judgment result, the multi-split air conditioner is controlled to shut down.

[0084] In this embodiment, if the status judgment results of all powered-off indoor units are the first judgment results, the outdoor unit can be controlled to operate in the current mode. If there is a second judgment result of the status judgment result of at least one powered-off indoor unit, the multi-split air conditioner is controlled to shut down, that is, as long as the second judgment result exists, the multi-split air conditioner needs to be controlled to shut down.

[0085] Step S1023: If the specific gravity is greater than the specific gravity threshold, the multi-split air conditioner is controlled to shut down.

[0086] In this embodiment, if the proportion of the number of indoor units that are powered off to the total number of indoor units is greater than a proportion threshold, it may be necessary to control the start and stop of the multi-split unit.

[0087] In one embodiment, see the attached Figure 2 , Figure 2 1 is a flow chart of the main steps of a method for controlling a multi-split air conditioner according to an implementation of an embodiment of the present invention. Figure 2 As shown, the control method of the multi-split air conditioner may include the following steps S201 to S215:

[0088] Step S201: The outdoor unit detection system detects a power-off indoor unit.

[0089] Step S202: Report a fault: the indoor unit is missing.

[0090] In this embodiment, after the outdoor unit detection system detects the indoor unit that is powered off, it can report a "missing indoor unit" fault.

[0091] Step S203: Is the power outage ratio greater than A? If yes, jump to step S207; if no, jump to step S204;

[0092] In this embodiment, the proportion of the power-off indoor units to the total number of indoor units may be compared with the proportion threshold A.

[0093] Step S204: Read the previous working status of the indoor unit that is powered off; if it is in cooling standby state or heating standby state, jump to step S205; if it is in heating state, jump to step S208; if it is in cooling state, jump to step S211.

[0094] Step S205: Cooling standby state or heating standby state, jump to step S206.

[0095] Step S206: The outdoor unit continues to operate in the current mode.

[0096] Step S207: Shutdown alarm.

[0097] Step S208: operate in heating mode, jump to step S209.

[0098] Step S209: intermittently detect the exhaust pressure of the outdoor unit compressor, and jump to step S210.

[0099] Step S210: Is P greater than P1? If yes, jump to step S207; if no, jump to step S206.

[0100] In this embodiment, the exhaust pressure P of the outdoor unit compressor may be compared with the exhaust pressure threshold value P1.

[0101] Step S211: operate in cooling state, jump to step S212.

[0102] Step S212: Read the previous opening degree D of the electronic expansion valve of the indoor unit that is powered off, and jump to step S213.

[0103] Step S213: D>D1? If yes, jump to step S207; if no, jump to step S214.

[0104] In this embodiment, the opening degree D of the electronic expansion valve before the indoor unit that is powered off is powered off may be compared with the opening degree threshold value D1.

[0105] Step S214: intermittently detect the exhaust gas superheat T of the outdoor unit compressor. Jump to step S215.

[0106] Step S215: T<T1? If yes, jump to step S207; if no, jump to step S206.

[0107] In this embodiment, the compressor exhaust gas superheat T may be compared with the superheat threshold T1.

[0108] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0109] Furthermore, the present invention also provides a control system for a multi-split air conditioner.

[0110] See attached Figure 3 , Figure 3 FIG. 1 is a main structural block diagram of a control system of a multi-split air conditioner according to an embodiment of the present invention. Figure 3 As shown, in an embodiment of the present invention, a multi-split air conditioner may include a plurality of indoor units. The control system of the multi-split air conditioner may include a module for acquiring the number of power-off indoor units and a multi-split air conditioner control module. In this embodiment, the module for acquiring the number of power-off indoor units may be configured to acquire the number of power-off indoor units when a power-off indoor unit is detected. The multi-split air conditioner control module may be configured to control the multi-split air conditioner according to the proportion of the number of power-off indoor units to the total number of indoor units.

[0111] The control system of the multi-split air conditioner is used to execute Figure 1 The control method embodiment of the multi-split air conditioner shown in the figure has similar technical principles, technical problems solved and technical effects produced. Technicians in this technical field can clearly understand that for the convenience and conciseness of description, the specific working process and related instructions of the control system of the multi-split air conditioner can refer to the contents described in the embodiment of the control method of the multi-split air conditioner, which will not be repeated here.

[0112] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0113] Furthermore, the present invention also provides a control device. In an embodiment of a control device according to the present invention, the control device includes a processor and a storage device, the storage device can be configured to store a program for executing the control method of the multi-split air conditioner of the above method embodiment, and the processor can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the control method of the multi-split air conditioner of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The control device can be a control device device formed by various electronic devices.

[0114] Furthermore, the present invention also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium can be configured to store a program for executing the control method of the multi-split air conditioner of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the control method of the multi-split air conditioner. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.

[0115] Further, it should be understood that since the setting of each module is only for illustrating 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 software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0116] Those skilled in the art will appreciate that the modules in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0117] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control method for a multi-split air conditioner, It is characterized in that The multi-split air conditioner includes a plurality of indoor units and an outdoor unit connected to the plurality of indoor units, and the method includes: When it is detected that there is a power-off indoor unit, the number of the power-off indoor units is obtained; According to the proportion of the number of indoor units that are powered off to the total number of indoor units, the proportion is compared with a preset proportion threshold; If the proportion is less than or equal to the proportion threshold, the multi-split air conditioner is controlled according to the working state of the indoor unit that is powered off before the power failure; The step of "controlling the multi-split air conditioner according to the working state of the indoor unit before the power failure" includes: For each indoor unit that is powered off, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the power failure; the state judgment result includes a first judgment result and a second judgment result; When the state judgment results of the indoor units that are powered off are all the first judgment results, controlling the outdoor units to operate according to the current mode; When the state judgment result of at least one indoor unit that is powered off is a second judgment result, controlling the multi-split air conditioner to shut down; The working state includes a standby state, a heating state and a cooling state, and the step of "obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before power failure" includes: If the working state of the indoor unit before power failure is a standby state, determining the state judgment result to be a first judgment result; If the working state of the indoor unit before power failure is the heating state, the exhaust pressure of the compressor of the outdoor unit is detected at regular intervals; if the exhaust pressure is less than or equal to a preset pressure threshold, the state judgment result is determined to be a first judgment result; if the exhaust pressure is greater than the pressure threshold, the state judgment result is determined to be a second judgment result; If the working state of the indoor unit that has been powered off before the power outage is a cooling state, the opening degree of the electronic expansion valve of the indoor unit that has been powered off before the power outage is compared with a preset opening threshold; if the opening degree is less than or equal to the opening threshold, the state judgment result of the indoor unit is obtained based on the exhaust gas superheat of the compressor of the outdoor unit; if the opening degree is greater than the opening threshold, the state judgment result is determined to be the second judgment result.

2. The control method of a multi-split air conditioner according to claim 1, It is characterized in that The step of "controlling the multi-split air conditioner according to the proportion of the number of indoor units that are powered off to the total number of indoor units" includes: If the specific gravity is greater than the specific gravity threshold, the multi-split air conditioner is controlled to shut down.

3. The control method of a multi-split air conditioner according to claim 1, It is characterized in that The step of "obtaining a state judgment result of the indoor unit according to the exhaust superheat of the compressor of the outdoor unit" includes: comparing the exhaust superheat of the compressor with a preset superheat threshold; If the exhaust gas superheat is greater than or equal to the superheat threshold, determining that the state judgment result is a first judgment result; If the exhaust gas superheat degree is less than the superheat degree threshold, the state judgment result is determined to be a second judgment result.

4. A control system for a multi-split air conditioner, It is characterized in that The multi-split air conditioner includes a plurality of indoor units and an outdoor unit connected to the plurality of indoor units, and the system includes: A power-off indoor unit number acquisition module, configured to acquire the number of the power-off indoor units when detecting the presence of the power-off indoor units; A multi-split air conditioner control module, configured to compare the proportion of the number of indoor units that are powered off to the total number of indoor units with a preset proportion threshold value; if the proportion is less than or equal to the proportion threshold value, the multi-split air conditioner is controlled according to the working state of the indoor units that are powered off before the power failure; The step of "controlling the multi-split air conditioner according to the working state of the indoor unit before the power failure" includes: For each indoor unit that is powered off, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the power failure; the state judgment result includes a first judgment result and a second judgment result; When the state judgment results of the indoor units that are powered off are all the first judgment results, controlling the outdoor units to operate according to the current mode; When the state judgment result of at least one indoor unit that is powered off is a second judgment result, controlling the multi-split air conditioner to shut down; The working state includes a standby state, a heating state and a cooling state, and the step of "obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before power failure" includes: If the working state of the indoor unit before power failure is a standby state, determining the state judgment result to be a first judgment result; If the working state of the indoor unit before power failure is the heating state, the exhaust pressure of the compressor is detected at regular intervals; if the exhaust pressure is less than or equal to a preset pressure threshold, the state judgment result is determined to be a first judgment result; if the exhaust pressure is greater than the pressure threshold, the state judgment result is determined to be a second judgment result; If the working state of the indoor unit that has been powered off before the power outage is a cooling state, the opening degree of the electronic expansion valve of the indoor unit that has been powered off before the power outage is compared with a preset opening threshold; if the opening degree is less than or equal to the opening threshold, the state judgment result of the indoor unit is obtained based on the exhaust gas superheat of the compressor of the outdoor unit; if the opening degree is greater than the opening threshold, the state judgment result is determined to be the second judgment result.

5. A control device comprising a processor and a storage device, wherein the storage device is suitable for storing a plurality of program codes, It is characterized in that The program code is suitable for being loaded and run by the processor to execute the control method of the multi-split air conditioner according to any one of claims 1 to 3.

6. A computer-readable storage medium having a plurality of program codes stored therein, It is characterized in that The program code is suitable for being loaded and run by a processor to execute the control method of the multi-split air conditioner according to any one of claims 1 to 3.

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