Control method and system of multi-split air conditioner

Abstract

The present invention relates to the field of air conditioning control technology, and specifically provides a control method and system for a multi-split air conditioner, which aims 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 disconnected from the outdoor unit due to abnormal reasons. To this end, when the present invention detects that there is an indoor unit that is disconnected from the outdoor unit, the multi-split air conditioner can be controlled according to the proportion of the number of indoor units with disconnected communication to the total number of indoor units. Through the above-mentioned configuration, the present invention can achieve the normal operation of the multi-split air conditioner when a small number of indoor units in the multi-split air conditioner are disconnected from the communication due to abnormal reasons, and can also retain the cooling and heating functions and effects of the multi-split air conditioner to the greatest extent before after-sales maintenance, thereby improving the fault tolerance of the multi-split air conditioner and further improving the user experience of the multi-split air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and specifically provides a control method and system 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 communication with the outdoor unit 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 communication between the indoor unit and the outdoor unit in the multi-split air conditioner is disconnected due to abnormal reasons.

[0005] In a first aspect, the present invention provides a control method for a multi-split air conditioner, the multi-split air conditioner comprising an outdoor unit and a plurality of indoor units connected to the outdoor unit, the method comprising:

[0006] When it is detected that there is an indoor unit that is disconnected from the outdoor unit, the number of indoor units that are disconnected from the outdoor unit is obtained;

[0007] The multi-split air conditioner is controlled according to the proportion of the number of indoor units whose communications are disconnected 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 with disconnected communication 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 with disconnected communication before the communication is disconnected;

[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 with disconnected communication before the communication is disconnected" includes:

[0013] For each indoor unit whose communication is disconnected, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the communication is disconnected;

[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 working state includes a cooling mode and a non-cooling mode, 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 the communication is disconnected" includes:

[0016] If the working state of the indoor unit before the communication is disconnected is a non-cooling mode, determining that the state judgment result is a first judgment result;

[0017] If the working state of the indoor unit before the communication is disconnected is the cooling mode, the exhaust gas superheat of the compressor of the outdoor unit is detected at regular intervals, and the state judgment result of the indoor unit is obtained according to the exhaust gas superheat.

[0018] 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 gas superheat" includes:

[0019] If the exhaust gas superheat is greater than or equal to a preset first superheat threshold, determining that the state judgment result is a first judgment result;

[0020] If the exhaust gas superheat is less than the first superheat threshold, the compressor is controlled to increase the frequency and operate for a preset time, and then the exhaust gas superheat is compared with a preset second superheat threshold;

[0021] If the exhaust gas superheat is greater than or equal to the second superheat threshold, determining that the state judgment result is the second judgment result;

[0022] If the exhaust superheat is less than the second superheat threshold, continuing to obtain the state judgment result of the indoor unit according to the exhaust superheat of the compressor of the outdoor unit;

[0023] Wherein, the first superheat threshold is greater than the second superheat threshold.

[0024] 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:

[0025] When the state judgment results of the indoor units with disconnected communication are all the first judgment results, controlling the outdoor units to operate according to the current mode;

[0026] When the state judgment result of at least one indoor unit with disconnected communication is the second judgment result, the multi-split air conditioner is controlled to shut down.

[0027] In a technical solution of the above-mentioned control method of the multi-split air conditioner, the method further includes:

[0028] When the outdoor unit operates according to the current mode, the indoor unit with disconnected communication is controlled according to the working state of the indoor unit with disconnected communication before the communication is disconnected and the input command of the indoor unit controller.

[0029] In a technical solution of the control method of the multi-split air conditioner, the non-cooling mode includes a heating mode and a standby mode, and the step of "controlling the indoor unit with disconnected communication according to the working state of the indoor unit with disconnected communication before the communication is disconnected and the input instruction of the indoor unit controller" includes:

[0030] When the working state of the indoor unit with disconnected communication is a cooling mode or a heating mode before the communication is disconnected, the indoor unit is controlled to operate according to the working state before the communication is disconnected, and an input instruction of the indoor unit controller is executed;

[0031] When the working state of the indoor unit with disconnected communication is the standby mode before the communication is disconnected, the indoor unit with disconnected communication is controlled according to the air inlet temperature of the evaporator of the indoor unit and the input command of the indoor unit controller.

[0032] In a technical solution of the control method of the multi-split air conditioner, the step of "controlling the indoor unit with disconnected communication according to the air inlet temperature of the evaporator of the indoor unit and the input instruction of the indoor unit controller" includes:

[0033] When the air inlet temperature is within the cooling temperature range and the input instruction is to operate the cooling mode, the indoor unit is controlled to operate the cooling mode;

[0034] When the air inlet temperature is in the cooling temperature range and the input instruction is to operate the heating mode, a prompt is issued that the heating mode cannot be operated at present;

[0035] When the air inlet temperature is within the heating temperature range and the input instruction is to operate the cooling mode, a prompt is issued that the cooling mode cannot be operated at present;

[0036] When the air inlet temperature is within the heating temperature range and the input instruction is to operate in the heating mode, the indoor unit is controlled to operate in the heating mode;

[0037] When the air inlet temperature is equal to the indoor ambient temperature, a prompt is issued that the outdoor shutdown unit cannot operate.

[0038] In a second aspect, the present invention provides a control system for a multi-split air conditioner, the multi-split air conditioner comprising an outdoor unit and a plurality of indoor units connected to the outdoor unit, the system comprising:

[0039] A communication disconnected indoor unit number acquisition module, configured to acquire the number of indoor units disconnected from the communication when detecting the presence of an indoor unit disconnected from the outdoor unit;

[0040] 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 with disconnected communication to the total number of indoor units.

[0041] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0042] In the technical solution of the present invention, when the present invention detects that there is an indoor unit that is disconnected from the outdoor unit, the multi-split air conditioner can be controlled according to the proportion of the number of indoor units with disconnected communication to the total number of indoor units. Through the above configuration, the present invention can achieve the normal operation of the multi-split air conditioner when a small number of indoor units in the multi-split air conditioner are disconnected from communication due to abnormal reasons, and can also retain the cooling and heating functions and effects of the multi-split air conditioner to the greatest extent before after-sales maintenance, thereby improving the fault tolerance of the multi-split air conditioner and further improving the user experience of the multi-split air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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:

[0044] 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;

[0045] 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;

[0046] Figure 3 is a schematic flow chart of main steps of controlling an indoor unit with disconnected communication according to an implementation of an embodiment of the present invention;

[0047] Figure 4 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

[0048] 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.

[0049] 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.

[0050] 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 may include an outdoor unit and a plurality of indoor units connected to the outdoor unit, and the control method of the multi-split air conditioner mainly includes the following steps S101-S102.

[0051] Step S101: when it is detected that there is an indoor unit disconnected from the outdoor unit, the number of indoor units disconnected from the outdoor unit is obtained.

[0052] In this embodiment, when it is detected that there is an indoor unit whose communication with the outdoor unit is disconnected, the number of the indoor units whose communication is disconnected can be obtained.

[0053] In one implementation, the number of indoor units with disconnected communications may be acquired through an outdoor unit detection system of the outdoor unit.

[0054] In one embodiment, the reasons causing the disconnection of communication between the indoor unit and the outdoor unit include, but are not limited to, abnormality of the communication network, failure of a circuit board of the indoor unit, and the like.

[0055] Step S102: Control the multi-split air conditioner according to the ratio of the number of indoor units with disconnected communication to the total number of indoor units.

[0056] In this embodiment, the multi-split air conditioner can be controlled according to the proportion of indoor units with disconnected communication to the total number of indoor units.

[0057] Based on the above steps S101-S102, when the embodiment of the present invention detects that there is an indoor unit that is disconnected from the outdoor unit, the multi-split air conditioner can be controlled according to the proportion of the number of indoor units with disconnected communication to the total number of indoor units. Through the above configuration, the embodiment of the present invention can achieve the normal operation of the multi-split air conditioner when a small number of indoor units in the multi-split air conditioner are disconnected from communication due to abnormal reasons, and can also retain the cooling and heating functions and effects of the multi-split air conditioner to the greatest extent before after-sales maintenance, thereby improving the fault tolerance of the multi-split air conditioner and further improving the user experience of the multi-split air conditioner.

[0058] The step S102 is further described below.

[0059] In one implementation of the embodiment of the present invention, step S102 may further include the following steps S1021 to S1023:

[0060] Step S1021: Compare the specific gravity with a preset specific gravity threshold.

[0061] In this implementation, the proportion of indoor units with disconnected communication to the total number of indoor units may be compared with a proportion threshold.

[0062] 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 with disconnected communication before the communication is disconnected.

[0063] In this implementation, step S1022 may further include the following steps S10221 and S10222:

[0064] Step S10221: for each indoor unit whose communication is disconnected, obtain the status judgment result of the indoor unit according to the working status of the indoor unit before the communication is disconnected.

[0065] In this embodiment, the working state may include a cooling mode and a non-cooling mode, the state judgment result may include a first judgment result, and step S10221 may include step S102211 and step S102212:

[0066] Step S102211: If the working state of the indoor unit before the communication is disconnected is a non-cooling mode, the state judgment result is determined to be the first judgment result.

[0067] In this embodiment, if the working state of the indoor unit before the communication is disconnected is a non-cooling mode, such as a heating mode, cooling standby or heating standby, the state judgment result of the indoor unit can be determined as the first judgment result.

[0068] Step S102212: If the working state of the indoor unit before the communication is disconnected is the cooling mode, the state judgment result of the indoor unit is obtained according to the exhaust gas superheat of the compressor of the outdoor unit.

[0069] In this embodiment, the state judgment result may include a second judgment result, and step S102212 may further include the following steps S1022121 to S1022124:

[0070] Step S1022121: If the exhaust superheat is greater than or equal to a preset first superheat threshold, the state judgment result is determined to be the first judgment result.

[0071] Step S1022122: If the exhaust gas superheat is less than the first superheat threshold, the compressor is controlled to increase the frequency and operate for a preset time, and then the exhaust gas superheat is compared with a preset second superheat threshold.

[0072] Step S1022123: If the exhaust superheat is greater than or equal to the second superheat threshold, the state judgment result is determined to be the second judgment result.

[0073] Step S1022124: If the exhaust gas superheat is less than the second superheat threshold, continue to obtain the state judgment result of the indoor unit according to the exhaust gas superheat of the compressor of the outdoor unit.

[0074] The first superheat threshold is greater than the second superheat threshold.

[0075] In this embodiment, when the working state of the indoor unit before the communication is disconnected is the cooling mode, the exhaust superheat of the compressor of the outdoor unit can be detected regularly. If the exhaust superheat is greater than or equal to the first superheat threshold, the state judgment result of the indoor unit is the first judgment result. If the exhaust superheat is less than the first superheat threshold, the compressor is controlled to increase the frequency and operate for a preset time, and then the exhaust superheat of the compressor is compared with the second superheat threshold. If the exhaust superheat is less than the second superheat threshold, the state judgment result of the indoor unit with the communication disconnected is obtained based on the exhaust superheat of the compressor; if the exhaust superheat is greater than or equal to the second superheat threshold, the state judgment result of the indoor unit is the second judgment result.

[0076] Step S10222: Control the multi-split air conditioner according to the status judgment result.

[0077] In this implementation, step S10222 may further include the following steps S102221 and S102222:

[0078] Step S102221: When the status judgment results of the indoor units whose communications are disconnected are all the first judgment results, the outdoor units are controlled to operate according to the current mode.

[0079] Step S102222: When the status judgment result of at least one indoor unit with disconnected communication is the second judgment result, the multi-split air conditioner is controlled to shut down.

[0080] In this embodiment, if the status judgment results of all indoor units with disconnected communication are the first judgment results, the outdoor unit can be controlled to operate in the current mode. If the status judgment result of at least one indoor unit with disconnected communication is the second judgment result, the multi-split air conditioner is controlled to shut down. In other words, as long as the status judgment result of one indoor unit with disconnected communication is the second judgment result, the multi-split air conditioner needs to be controlled to shut down.

[0081] Step S1023: If the specific gravity is greater than the specific gravity threshold, the multi-split air conditioner is controlled to shut down.

[0082] In this embodiment, if the proportion of indoor units with disconnected communication to the total number of indoor units is greater than the proportion threshold, the multi-split air conditioner can be directly controlled to shut down.

[0083] In an implementation of an embodiment of the present invention, in addition to the above steps S101 and S102, the present invention may further include the following step S103:

[0084] Step S103: When the outdoor unit operates according to the current mode, the indoor unit with disconnected communication is controlled according to the working state of the indoor unit with disconnected communication before the communication is disconnected and the input command of the indoor unit controller.

[0085] In this embodiment, the non-cooling mode may include a heating mode and a standby mode, and step S103 may further include the following steps S1031 and S1032:

[0086] Step S1031: When the working state of the indoor unit with disconnected communication is cooling mode or heating mode before the communication is disconnected, the indoor unit is controlled to operate according to the working state before the communication is disconnected, and the input command of the indoor unit controller is executed.

[0087] In this embodiment, if the working state of the indoor unit is cooling mode and heating mode before the communication is disconnected, the indoor unit is controlled to continue to operate according to the working state before the communication is disconnected. At the same time, the user can input instructions to the indoor unit through the indoor unit controller, such as a wire controller, a remote control, a centralized controller, etc., to enable it to perform fan operation, temperature operation, shutdown operation, etc.

[0088] In one implementation, if the working state of the indoor unit is a cooling mode or a heating mode before the communication is disconnected, the indoor unit may be controlled to continue to operate according to the overheating degree of the indoor unit before the communication is disconnected.

[0089] Step S1032: When the working state of the indoor unit with disconnected communication is the standby mode before the communication is disconnected, the indoor unit with disconnected communication is controlled according to the air inlet temperature of the evaporator of the indoor unit and the input command of the indoor unit controller.

[0090] In this implementation, step S1032 may further include steps S10321 to S10325:

[0091] Step S10321: When the air inlet temperature is within the cooling temperature range and the input instruction is to operate the cooling mode, the indoor unit is controlled to operate the cooling mode.

[0092] Step S10322: When the air inlet temperature is in the cooling temperature range and the input instruction is to operate the heating mode, a prompt is issued that the heating mode cannot be operated at present.

[0093] Step S10323: When the air inlet temperature is within the heating temperature range and the input instruction is to operate the cooling mode, a prompt is issued indicating that the cooling mode cannot be operated at present.

[0094] Step S10324: When the air inlet temperature is within the heating temperature range and the input command is to operate the heating mode, the indoor unit is controlled to operate the heating mode.

[0095] Step S10325: When the air inlet temperature is equal to the indoor ambient temperature, a prompt is issued that the outdoor shutdown unit cannot operate.

[0096] In this embodiment, before the communication is disconnected, when the working state of the indoor unit with disconnected communication is standby mode, the indoor unit can continue to maintain the current working state. When the indoor unit controller has an input instruction, such as the user's power-on operation, the indoor unit can be controlled according to the air inlet temperature of the indoor unit's evaporator and the input instruction.

[0097] In one implementation, the initial opening degree of the indoor unit with disconnected communication when it is turned on may be 100 steps.

[0098] In one implementation, after the indoor unit with communication disconnected is turned on, it can respond to input commands input by the user through the indoor unit controller, such as fan operation, temperature operation, shutdown operation, etc.

[0099] In one embodiment, when the working state of the indoor unit with disconnected communication is in heating mode before the communication is disconnected, when the user shuts down the indoor unit, after the indoor unit stops, the electronic expansion valve of the indoor unit needs to maintain a certain reference opening to ensure oil return.

[0100] In one embodiment, please refer to 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 S212:

[0101] Step S201: The outdoor unit detection system detects an indoor unit with disconnected communication.

[0102] Step S202: Report a fault: the indoor unit is missing.

[0103] Step S203: Check whether the proportion of indoor units with disconnected communication is greater than A. If so, jump to step S212; if not, jump to step S204.

[0104] In this implementation, the proportion of indoor units with disconnected communication to the total number of indoor units may be compared with the proportion threshold A.

[0105] Step S204: Read the working state of the indoor unit before the communication is disconnected. If it is cooling standby, heating standby, or heating, jump to step S205; if it is cooling operation, jump to step S207.

[0106] In this embodiment, the working state of the communication disconnected indoor unit before the communication is disconnected can be read.

[0107] Step S205: Cooling standby or heating standby or heating, jump to step S206.

[0108] Step S206: The outdoor unit continues to operate in the current mode and jumps to step S203.

[0109] Step S207: Cooling operation, jump to step S208.

[0110] Step S208: intermittently detect the exhaust gas superheat T of the outdoor unit compressor, and jump to step S209.

[0111] Step S209: T<T1? If yes, jump to step S210; if no, jump to step S206.

[0112] In this embodiment, the exhaust gas superheat degree of the outdoor unit compressor may be compared with the first superheat degree threshold T1.

[0113] Step S210: The compressor frequency increases and the process jumps to step S211.

[0114] Step S211: T<T2? If yes, jump to step S212; if no, jump to step S208.

[0115] Step S212: The multi-split air conditioner stops and alarms.

[0116] In one embodiment, please refer to the attached Figure 3 , Figure 3 FIG. 1 is a flow chart of the main steps of controlling an indoor unit with disconnected communication according to an implementation of an embodiment of the present invention. Figure 3 As shown, controlling the indoor unit with disconnected communication may include the following steps S301 to S304:

[0117] Step S301: The indoor unit detects that the local communication has been disconnected.

[0118] In this embodiment, when the indoor unit detects that the communication between the indoor unit and the outdoor unit is disconnected, the process may jump to step S302.

[0119] Step S302: Report a fault: the communication of this indoor unit is abnormal.

[0120] Step S303: Detect the working status of the outdoor unit and the indoor unit before the communication is disconnected.

[0121] Step S304: Control the indoor environment according to the working status of the outdoor unit and the indoor unit before the communication is disconnected.

[0122] In this embodiment, the indoor environment can be controlled according to the working status of the outdoor unit and the indoor unit before the communication is disconnected.

[0123] 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.

[0124] Furthermore, the present invention also provides a control system for a multi-split air conditioner.

[0125] See attached Figure 4 , Figure 4 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 4 As shown, the multi-split air conditioner in the embodiment of the present invention includes an outdoor unit and a plurality of indoor units connected to the outdoor unit, and the control system of the multi-split air conditioner may include a module for obtaining the number of indoor units disconnected from communication and a multi-split air conditioner control module. In this embodiment, the module for obtaining the number of indoor units disconnected from communication may be configured to obtain the number of indoor units disconnected from communication when it is detected that there is an indoor unit disconnected from communication with the outdoor unit. 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 indoor units disconnected from communication to the total number of indoor units.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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, characterized in that: The multi-split air conditioner includes an outdoor unit and a plurality of indoor units connected to the outdoor unit, and the method includes: When it is detected that there is an indoor unit that is disconnected from the outdoor unit, the number of indoor units that are disconnected from the outdoor unit is obtained; According to the proportion of the number of indoor units with disconnected communication 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 with disconnected communication before the communication is disconnected; If the specific gravity is greater than the specific gravity threshold, controlling the multi-split air conditioner to shut down; The step of "controlling the multi-split air conditioner according to the working state of the indoor unit with disconnected communication before the communication is disconnected" includes For each indoor unit whose communication is disconnected, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the communication is disconnected; Controlling the multi-split air conditioner according to the state judgment result; The working state includes a cooling mode and a non-cooling mode, and the state judgment result includes a first judgment result and a second judgment result; the step of "obtaining the state judgment result of the indoor unit according to the working state of the indoor unit before the communication is disconnected" includes: If the working state of the indoor unit before the communication is disconnected is a non-cooling mode, determining that the state judgment result is a first judgment result; If the working state of the indoor unit before the communication is disconnected is the cooling mode, the exhaust superheat of the compressor of the outdoor unit is detected at regular intervals, and if the exhaust superheat is greater than or equal to a preset first superheat threshold, the state judgment result is determined to be the first judgment result; If the exhaust gas superheat is less than the first superheat threshold, the compressor is controlled to increase the frequency and operate for a preset time, and then the exhaust gas superheat is compared with a preset second superheat threshold; If the exhaust gas superheat is less than the second superheat threshold, determining that the state judgment result is the second judgment result; If the exhaust gas superheat is greater than or equal to the second superheat threshold, then continue to obtain the state judgment result of the indoor unit according to the exhaust gas superheat of the compressor of the outdoor unit; Wherein, the first superheat threshold is greater than the second superheat threshold; The step of "controlling the multi-split air conditioner according to the state judgment result" includes: When the state judgment results of the indoor units with disconnected communication 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 with disconnected communication is the second judgment result, the multi-split air conditioner is controlled to shut down.

2. The control method of a multi-split air conditioner according to claim 1, characterized in that: The method further comprises: When the outdoor unit operates according to the current mode, the indoor unit with disconnected communication is controlled according to the working state of the indoor unit with disconnected communication before the communication is disconnected and the input command of the indoor unit controller.

3. The control method of a multi-split air conditioner according to claim 2, characterized in that: The non-cooling mode includes a heating mode and a standby mode, and the step of "controlling the indoor unit with disconnected communication according to the working state of the indoor unit with disconnected communication and the input instruction of the indoor unit controller before the communication is disconnected" includes: When the working state of the indoor unit with disconnected communication is a cooling mode or a heating mode before the communication is disconnected, the indoor unit is controlled to operate according to the working state before the communication is disconnected, and an input instruction of the indoor unit controller is executed; When the working state of the indoor unit with disconnected communication is the standby mode before the communication is disconnected, the indoor unit with disconnected communication is controlled according to the air inlet temperature of the evaporator of the indoor unit and the input command of the indoor unit controller.

4. The control method of a multi-split air conditioner according to claim 3, characterized in that: The step of "controlling the indoor unit with disconnected communication according to the air inlet temperature of the evaporator of the indoor unit and the input instruction of the indoor unit controller" includes: When the air inlet temperature is within the cooling temperature range and the input instruction is to operate the cooling mode, the indoor unit is controlled to operate the cooling mode; When the air inlet temperature is in the cooling temperature range and the input instruction is to operate the heating mode, a prompt is issued that the heating mode cannot be operated at present; When the air inlet temperature is within the heating temperature range and the input instruction is to operate the cooling mode, a prompt is issued that the cooling mode cannot be operated at present; When the air inlet temperature is within the heating temperature range and the input instruction is to operate in the heating mode, the indoor unit is controlled to operate in the heating mode; When the air inlet temperature is equal to the indoor ambient temperature, a prompt is issued that the outdoor shutdown unit cannot operate.

5. A control system for a multi-split air conditioner, characterized in that: The multi-split air conditioner includes an outdoor unit and a plurality of indoor units connected to the outdoor unit, and the system includes: A communication disconnected indoor unit number acquisition module, configured to acquire the number of indoor units disconnected from the communication when detecting the presence of an indoor unit disconnected from the outdoor unit; A multi-split air conditioner control module, configured to compare the proportion of the number of indoor units with disconnected communication to the total number of indoor units 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 with disconnected communication before the communication is disconnected; If the specific gravity is greater than the specific gravity threshold, controlling the multi-split air conditioner to shut down; The step of "controlling the multi-split air conditioner according to the working state of the indoor unit with disconnected communication before the communication is disconnected" includes For each indoor unit whose communication is disconnected, obtaining a state judgment result of the indoor unit according to the working state of the indoor unit before the communication is disconnected; Controlling the multi-split air conditioner according to the state judgment result; The working state includes a cooling mode and a non-cooling mode, and the state judgment result includes a first judgment result and a second judgment result; the step of "obtaining the state judgment result of the indoor unit according to the working state of the indoor unit before the communication is disconnected" includes: If the working state of the indoor unit before the communication is disconnected is a non-cooling mode, determining that the state judgment result is a first judgment result; If the working state of the indoor unit before the communication is disconnected is the cooling mode, the exhaust superheat of the compressor of the outdoor unit is detected at regular intervals, and if the exhaust superheat is greater than or equal to a preset first superheat threshold, the state judgment result is determined to be the first judgment result; If the exhaust gas superheat is less than the first superheat threshold, the compressor is controlled to increase the frequency and operate for a preset time, and then the exhaust gas superheat is compared with a preset second superheat threshold; If the exhaust gas superheat is less than the second superheat threshold, determining that the state judgment result is the second judgment result; If the exhaust gas superheat is greater than or equal to the second superheat threshold, then continue to obtain the state judgment result of the indoor unit according to the exhaust gas superheat of the compressor of the outdoor unit; Wherein, the first superheat threshold is greater than the second superheat threshold; The step of "controlling the multi-split air conditioner according to the state judgment result" includes: When the state judgment results of the indoor units with disconnected communication 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 with disconnected communication is the second judgment result, the multi-split air conditioner is controlled to shut down.

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