Control method and apparatuses for central air conditioner, central air conditioner, and storage medium

Abstract

A control method and apparatuses for a central air conditioner, a central air conditioner, a storage medium, and a computer program. The method comprises: on the basis of an operation mode of a central air conditioner, a communication state between an indoor unit (22) and an outdoor unit (21), and opening degree information of a throttling apparatus of the indoor unit (22), determining whether the indoor unit (22) is a first missing indoor unit (22), and counting the number of all first missing indoor units (22) and using the number as a first number; and executing control processing on the central air conditioner on the basis of the operation mode of the central air conditioner, the first number, and an operation parameter of the central air conditioner.

Description

Central air conditioner control method, device, central air conditioner and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims priority to an application with CN application number 202311801755.7 and filing date December 25, 2023. The disclosure content of this CN application is hereby introduced into this disclosure as a whole. Technical Field

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

[0004] A central air conditioner is a unit consisting of one outdoor unit connected to at least two indoor units via piping. This can include various types of multi-split systems. While the central air conditioner is operating, the indoor units may sometimes lose power. After a power outage, the electronic expansion valves in these units will remain open to the same degree as before the outage. If the central air conditioner continues to operate, this can cause the refrigerant in the central air conditioner to flow through the disconnected indoor units. This uncontrolled refrigerant bypass can compromise the safe operation of the central air conditioner and cause damage to the compressor.

[0005] Summary of the Invention

[0006] According to a first aspect of the present disclosure, a control method for a central air conditioner is provided, wherein the central air conditioner includes an outdoor unit and an indoor unit, and the method includes: judging whether the indoor unit is a first missing indoor unit according to the operating mode of the central air conditioner, the communication status between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit, and counting a first number of all first missing indoor units; and performing control processing on the central air conditioner based on the operating mode of the central air conditioner, the first number, and the operating parameters of the central air conditioner.

[0007] In some embodiments, judging whether the indoor unit is the first missing indoor unit based on the operating mode of the central air conditioner, the communication status between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit includes: when it is determined that the communication between the indoor unit and the outdoor unit is interrupted, obtaining the opening information of the throttling device before the communication is interrupted; judging whether the indoor unit is the first missing indoor unit based on the operating mode of the central air conditioner and the opening information.

[0008] In some embodiments, determining whether the indoor unit is the first missing indoor unit based on the operating mode of the central air conditioner and the opening information includes: when the operating mode of the central air conditioner is the cooling mode and the opening information is not 0, determining that the indoor unit is the first missing indoor unit.

[0009] In some embodiments, the determination of whether the indoor unit is the first missing indoor unit based on the operating mode of the central air conditioner and the opening information includes all of the following options: when the operating mode of the central air conditioner is the heating mode and the opening information is greater than the opening threshold, the indoor unit is determined to be the first missing indoor unit.

[0010] In some embodiments, the operating parameters include: the compressor exhaust temperature and compressor suction pressure of the outdoor unit, and the average superheat of the indoor unit performing cooling operation; the control processing of the central air conditioner based on the operating mode of the central air conditioner, the first number and the operating parameters of the central air conditioner includes: when the operating mode of the central air conditioner is cooling mode and the cooling alarm shutdown conditions are met, alarm processing is performed and the central air conditioner is controlled to shut down; wherein the cooling alarm shutdown conditions include all of the following options: the first number is greater than or equal to the indoor unit missing number threshold, the compressor exhaust temperature is less than the exhaust low temperature threshold, the compressor suction pressure is less than the system low pressure threshold, the average superheat is greater than the target superheat and the duration is greater than or equal to the first duration threshold.

[0011] In some embodiments, when the operation mode of the central air conditioner is the cooling mode and the cooling alarm shutdown condition is not met, the central air conditioner is controlled to operate.

[0012] In some embodiments, the operating parameters include: the compressor exhaust temperature, compressor suction pressure and compressor exhaust pressure of the outdoor unit; the control processing of the central air conditioner based on the operating mode of the central air conditioner, the first quantity and the operating parameters of the central air conditioner includes: when the operating mode of the central air conditioner is a heating mode and the heating alarm shutdown conditions are met, alarm processing is performed and the central air conditioner is controlled to shut down; wherein, the heating alarm shutdown conditions include: the first quantity is greater than or equal to the indoor unit missing quantity threshold, the compressor exhaust temperature is greater than the exhaust high temperature threshold, the compressor suction pressure is less than the system low pressure threshold, the compressor exhaust pressure is less than or equal to the exhaust pressure threshold and the duration is greater than or equal to the second duration threshold.

[0013] In some embodiments, when the operation mode of the central air conditioner is the heating mode and the heating alarm shutdown condition is not met, the central air conditioner is controlled to operate.

[0014] In some embodiments, after the central air conditioner is controlled to shut down and a unit startup command is received, whether the indoor unit is the second missing indoor unit is determined based on the communication status between the indoor unit and the outdoor unit, and the second number of all second missing indoor units and the first number are counted; based on the operating mode of the central air conditioner and the second number, or based on the operating mode of the central air conditioner and the second number and the first number, it is determined whether to control the central air conditioner to restart.

[0015] In some embodiments, determining whether to control the central air conditioner to restart includes: when the operating mode of the central air conditioner is a cooling mode and the cooling start-up condition is met, determining to control the central air conditioner to restart; wherein, the cooling start-up condition includes: the second number is less than the indoor unit missing number threshold.

[0016] In some embodiments, determining whether to control the central air conditioner to restart includes: when the operating mode of the central air conditioner is the heating mode and the heating start-up conditions are met, determining to control the central air conditioner to restart; wherein, the heating restart conditions include: the difference between the second number and the first number is less than the indoor unit missing number threshold.

[0017] In some embodiments, judging whether the indoor unit is the second missing indoor unit based on the communication status between the indoor unit and the outdoor unit includes: determining that the indoor unit is the second missing indoor unit when it is determined that the communication between the indoor unit and the outdoor unit is interrupted.

[0018] In some embodiments, after the central air conditioner is restarted, it is determined whether to control the central air conditioner to run at full power based on the operating mode of the central air conditioner, the second number, and the operating time of the compressor, or based on the operating mode of the central air conditioner, the second number and the first number, and the operating time of the compressor.

[0019] In some embodiments, the determination of whether to control the central air conditioner to operate at full power includes: when the operating mode of the central air conditioner is a cooling mode, and the first indoor unit missing time is greater than or equal to a first missing time threshold, and the operating time of the compressor is greater than or equal to a first operating time threshold, determining to control the central air conditioner to operate at full power; wherein, the first indoor unit missing time is the time between the current moment and the first indoor unit missing confirmation moment; the first indoor unit missing confirmation moment is the moment of first confirmation that the second number is greater than or equal to the indoor unit missing number threshold.

[0020] In some embodiments, the determination of whether to control the central air conditioner to operate at full power includes: when the operating mode of the central air conditioner is a heating mode, and the missing time of the second indoor unit is greater than or equal to a second missing time threshold, and the operating time of the compressor is greater than or equal to a second operating time threshold, determining to control the central air conditioner to operate at full power; wherein, the missing time of the second indoor unit is the time between the current moment and the second indoor unit missing confirmation moment; the second indoor unit missing confirmation moment is the moment of first confirmation that the difference between the second number and the first number is greater than or equal to the indoor unit missing number threshold.

[0021] According to a second aspect of the present disclosure, a control device for a central air conditioner is provided, wherein the central air conditioner includes an outdoor unit and an indoor unit, and the control device includes: an indoor unit missing determination module, for determining whether the indoor unit is a first missing indoor unit based on the operating mode of the central air conditioner, the communication status between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit, and counting a first number of all first missing indoor units; and a control execution module, for performing control processing on the central air conditioner based on the operating mode of the central air conditioner, the first number, and the operating parameters of the central air conditioner.

[0022] According to a third aspect of the present disclosure, a control device for a central air conditioner is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the method described above based on instructions stored in the memory.

[0023] According to a fourth aspect of the present disclosure, a central air conditioner is provided, comprising the control device of the central air conditioner as described above.

[0024] According to a fifth aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to perform the method described above.

[0025] According to a sixth aspect of the present disclosure, there is provided a computer program comprising: instructions, which, when executed by a processor, cause the processor to perform the method described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, a brief introduction to the drawings required for use in the embodiments or related technology descriptions will be given below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor. In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, a brief introduction to the drawings required for use in the embodiments or related technology descriptions will be given below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] FIG1 is a flow chart of some embodiments of a method for controlling a central air conditioner according to the present disclosure;

[0028] Figure 2 is a schematic diagram of the distributed layout of central air conditioning;

[0029] FIG3 is a schematic diagram of a flow chart of determining whether an indoor unit is missing in some embodiments of the central air conditioner control method according to the present disclosure;

[0030] FIG4 is a schematic diagram of a flow chart of a control process for a central air conditioner according to some embodiments of the control method of the central air conditioner disclosed herein;

[0031] FIG5 is a schematic diagram of a process for controlling the restart of a central air conditioner in some embodiments of the control method of the central air conditioner according to the present disclosure;

[0032] FIG6 is a module diagram of some embodiments of a central air conditioner control device according to the present disclosure;

[0033] FIG7 is a module diagram of other embodiments of the central air conditioner control device according to the present disclosure;

[0034] FIG8 is a module diagram of yet other embodiments of the control device for a central air conditioner according to the present disclosure. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of the embodiments are described in the specification. However, it should be understood that many implementation-specific settings must be made in the process of implementing the embodiments in order to achieve the developer's specific goals, such as meeting those restrictions related to equipment and services, and these restrictions may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the contents of this disclosure.

[0036] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0037] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, and do not represent any specific technical meanings, nor do they indicate a necessary logical order between them.

[0038] It should also be understood that in the embodiments of the present disclosure, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0039] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0040] In addition, the term "and / or" in this disclosure is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this disclosure generally indicates that the related objects are in an "or" relationship.

[0041] It should also be understood that the description of the various embodiments in this disclosure focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced with each other. For the sake of brevity, they will not be described one by one.

[0042] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0045] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] In addition, in order to avoid obscuring the present disclosure with unnecessary details, only the processing steps and / or device structures that are closely related to at least the solution according to the present disclosure are shown in the drawings, while other details that are not closely related to the present disclosure are omitted. It should also be noted that similar reference numerals and letters in the drawings indicate similar items, and therefore once an item is defined in one drawing, it does not need to be discussed again for subsequent drawings.

[0047] In the related art known to the inventors, when the central air conditioner is running, the indoor unit may sometimes be powered off. Due to the characteristics of the distributed layout of the central air conditioner, the control of the refrigerant requires flow regulation between each indoor unit. After the indoor unit is powered off, the adjustment of the expansion valve of the indoor unit is in an uncontrollable state, and the electronic expansion valve of the indoor unit will remain at the opening before the power outage. If the central air conditioner continues to run, the refrigerant in the central air conditioner may flow through the indoor unit that has lost power. This bypassed refrigerant amount may affect the operational safety of the central air conditioner if it is not controlled. If too many indoor units are powered off, it may cause refrigerant leakage, and the compressor may not be able to return oil in time, causing damage to the compressor and other problems.

[0048] Central air conditioning requires a unified power supply for both indoor and outdoor units. However, this is difficult to achieve in actual installations. Doing so increases installation costs and complexity. For example, a central air conditioner's outdoor unit is installed on the roof or downstairs, while the indoor units are installed in each room on floors 1-5. If these units are supplied with a unified power supply, it would require connecting the power supply for floors 1-5 and designing a power distribution cabinet, increasing installation complexity and labor costs.

[0049] In related multi-split system control methods, if the number of indoor units without power is less than a set number in a central air conditioner, the central air conditioner continues to operate; if the number of indoor units without power is greater than or equal to the set number, the central air conditioner shuts down. However, after some indoor units lose power, the opening of their electronic expansion valves is zero or small, which does not significantly impact the central air conditioner's operation, allowing it to continue operating normally. Using related central air conditioner control methods, a multi-split system may shut down even when the central air conditioner is operating normally, rendering functional indoor units inoperable. This causes inconvenience to users and fails to meet their needs.

[0050] In view of this, a technical problem to be solved by the present disclosure is to provide a control method for a central air conditioner, which controls the central air conditioner according to the operating mode of the central air conditioner, the communication status between the indoor unit and the outdoor unit, the opening of the throttling device of the indoor unit, and the operating conditions of the central air conditioner. In the event that some indoor units are missing, the other indoor units can operate normally without affecting the overall operation of the central air conditioner, thereby ensuring the operating safety of the central air conditioner and improving the reliability of the central air conditioner.

[0051] FIG1 is a flow chart of some embodiments of a control method for a central air conditioner according to the present disclosure, as shown in FIG1 :

[0052] Step 101, based on the operation mode of the central air conditioner, the communication status between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit, determine whether the indoor unit is the first missing indoor unit, and count the first number of all the first missing indoor units.

[0053] In some embodiments, central air conditioners include various multi-split units, modular units, and the like. A central air conditioner comprising one or more external units as a whole, and a plurality of units in which the external unit module is connected to multiple indoor units, all fall within the scope of the present disclosure. As shown in FIG2 , a central air conditioner includes an external unit 21 and an indoor unit 22. Multiple indoor units 22 can be installed in various rooms. The central air conditioner can operate in heating or cooling mode, and the communication status between the indoor and outdoor units can be interrupted or normal.

[0054] The throttling device of the indoor unit can be an electronic expansion valve, etc., and the opening information of the throttling device of the indoor unit is the opening degree of the electronic expansion valve, etc. The electronic expansion valve is installed in the indoor unit and is used to adjust the refrigerant pressure and refrigerant flow to ensure reliable heat exchange. Each indoor unit of the central air conditioner is connected to the outdoor unit through piping. The opening degree of the electronic expansion valve in the indoor unit is adjusted to control the refrigerant flow rate.

[0055] Step 102 : performing control processing on the central air conditioner based on the operation mode of the central air conditioner, the first quantity, and the operation parameters of the central air conditioner.

[0056] In some embodiments, the operating parameters of the central air conditioner may be various parameters, such as compressor exhaust temperature, compressor suction pressure, etc. Executing control processing on the central air conditioner includes controlling the operation or shutdown of a multi-split unit.

[0057] The control method of the central air conditioner in the above embodiment counts the number of missing indoor units according to the unit operation mode, the communication status between the indoor unit and the outdoor unit, and the opening of the throttling device of the indoor unit, and controls the operation or shutdown of the multi-split unit in combination with the operation status of the unit. It can enable the other indoor units to work normally when some indoor units are missing without affecting the overall operation of the central air conditioner, ensure the operating safety of the central air conditioner, and improve the reliability of the central air conditioner; it can meet the user's usage needs and improve the user's usage experience.

[0058] FIG3 is a flow chart of determining whether an indoor unit is missing in some embodiments of the central air conditioner control method according to the present disclosure, as shown in FIG3 :

[0059] Step 301: When it is determined that the communication between the indoor unit and the outdoor unit is interrupted, the opening information of the throttling device before the communication is interrupted is obtained.

[0060] In some embodiments, communication between the indoor unit and the outdoor unit is interrupted when the indoor unit loses power or experiences a malfunction. Data exchange between the indoor unit and the outdoor unit can occur via the CAN bus. If the indoor unit loses power or the communication line is disconnected, the indoor unit cannot send data to the CAN bus, and the outdoor unit cannot receive data from the indoor unit. Communication between the indoor unit and the outdoor unit is determined to be interrupted when the outdoor unit does not receive any data from the indoor unit within a preset time period (e.g., 5 minutes, 10 minutes, 20 minutes, etc.).

[0061] The outdoor unit can receive data sent by the indoor unit in real time, including information such as the current opening degree of the indoor unit's electronic expansion valve, and record the data. Based on the data sent by the indoor unit received by the outdoor unit before communication was interrupted, the outdoor unit can obtain the opening degree information of the electronic expansion valve throttling device, such as the throttling device, last reported by the indoor unit as the opening degree information of the electronic expansion valve throttling device, such as the throttling device, before communication was interrupted; alternatively, the outdoor unit can obtain the opening degree information of multiple electronic expansion valve throttling devices, such as the throttling device, reported by the indoor unit before communication was interrupted, and can use multiple methods to determine the opening degree information of the electronic expansion valve throttling device, such as the throttling device, before communication was interrupted based on the multiple opening degree information.

[0062] Step 302: Determine whether the indoor unit is the first missing indoor unit based on the operation mode and opening information of the central air conditioner.

[0063] By obtaining the opening information of the throttling device of the indoor unit where communication is interrupted and determining the missing indoor unit in combination with the operating mode of the central air conditioner, the number of missing indoor units that affect the operational safety of the central air conditioner can be accurately determined, and the operation or shutdown of the multi-split unit can be controlled based on this number. In the event that some indoor units are missing, the other indoor units can operate normally, thereby ensuring the operational safety of the central air conditioner and improving the reliability of the central air conditioner.

[0064] In some embodiments, the indoor and outdoor units of a central air conditioner are interconnected, and the operation of the central air conditioner requires controlled refrigerant flow. If an indoor unit is missing, its electronic expansion valve cannot be controlled, potentially leaving the original refrigerant in the indoor unit. This can lead to insufficient refrigerant in the entire central air conditioner, causing low suction pressure in the compressor and delayed oil return. This can cause the compressor to operate in an oil-starved state, leading to compressor failure.

[0065] When the communication between the indoor unit and the outdoor unit is interrupted, and the operation mode of the central air conditioner is the cooling mode and the opening information is not 0, the indoor unit is determined to be the first missing indoor unit.

[0066] For example, when the central air conditioner is operating in cooling mode, a first number B of all first-missing indoor units is counted, and the initial value of first number B can be set to 0. When it is determined that communication between an indoor unit and an outdoor unit is interrupted, the opening information of the indoor unit's motor expansion valve before the communication interruption is obtained based on data sent by the indoor unit and received by the outdoor unit before the communication interruption. If the opening information of the electronic expansion valve is non-zero, the indoor unit is determined to be the first-missing indoor unit, and 1 is added to the first number B. If the opening information of the electronic expansion valve is 0, the indoor unit is not counted in the first number B.

[0067] During cooling operation, the refrigerant circulates through the outdoor unit before passing through the indoor unit. The outdoor unit has a subcooler to bypass the refrigerant, preventing the refrigerant from passing through the inactive indoor unit. The electronic expansion valve opening information of the inactive indoor unit is 0, which does not affect system operation. If the electronic expansion valve of the indoor unit with communication interruption is closed and the opening information is 0, the indoor unit will not significantly affect the operation of the entire central air conditioner, and the central air conditioner can continue to operate normally.

[0068] By obtaining the opening information of the throttling device in the cooling mode, the number of missing indoor units that affect the operational safety of the central air conditioner in the cooling mode can be accurately determined, and the operation or shutdown of the multi-split unit can be controlled based on this number. Other indoor units can be enabled to operate normally in the cooling mode, thereby ensuring the operational safety of the central air conditioner and improving its reliability.

[0069] In some embodiments, when communication between the indoor unit and the outdoor unit is interrupted, the indoor unit is determined to be the first missing indoor unit if the central air conditioner is in heating mode and the opening information is greater than the opening threshold. The various thresholds disclosed herein can be configured according to different application scenarios, operating modes, etc.

[0070] For example, when the operation mode of the central air conditioner is heating mode, the first number B of all the first missing indoor units is counted, and the initial value of the first number B can be set to 0; when it is determined that the communication between an indoor unit and an outdoor unit is interrupted, the opening information of the electronic expansion valve of the indoor unit before the communication is interrupted is obtained based on the data sent by the indoor unit received by the outdoor unit before the communication is interrupted; if the opening information of the electronic expansion valve is greater than the opening threshold P (for example, 280PLS, etc.), the indoor unit is determined to be the first missing indoor unit, and the first number B is increased by 1; if the opening information of the electronic expansion valve before the communication between the indoor unit and the outdoor unit is less than or equal to the opening threshold P, it is not counted in the first number B.

[0071] When the central air conditioner is running in heating mode, since the refrigerant circulates through the indoor unit first, the indoor unit that is not turned on needs to be opened to a certain degree for refrigerant bypass circulation, otherwise the refrigerant flow of the central air conditioner will be greatly resisted.

[0072] In the heating mode, if the communication between the indoor unit and the outdoor unit is interrupted, the throttling device of this indoor unit cannot be controlled. When the opening degree of the throttling device of this indoor unit is greater than the opening degree threshold, it may cause the amount of refrigerant in the central air-conditioning to be too small, etc., affecting the safe operation of the central air-conditioning, and this indoor unit is determined as the first missing indoor unit; when the opening degree of the throttling device of this indoor unit is less than or equal to the opening degree threshold, it usually does not affect the safe operation of the central air-conditioning, and this indoor unit is not determined as the first missing indoor unit; by obtaining the opening degree information of the throttling device in the heating mode, the number of missing indoor units that affect the operational safety of the central air-conditioning in the heating mode can be accurately determined, and the operation or shutdown of the multi-split unit can be controlled according to this number, so that other indoor units can work normally in the heating mode, the operational safety of the central air-conditioning can be guaranteed, and the reliability of the central air-conditioning is improved.

[0073] FIG4 is a flow chart of a control process for a central air conditioner according to some embodiments of the control method of the central air conditioner disclosed herein, as shown in FIG4 :

[0074] Step 401: Control the cooling operation of the central air conditioner.

[0075] Step 403 , determining whether the cooling alarm shutdown condition is met, if yes, proceeding to step 405 , if not, proceeding to step 406 .

[0076] Step 405: Perform alarm processing and control the central air conditioner to shut down.

[0077] Step 406: Control the central air conditioner to continue running.

[0078] In some embodiments, central air conditioning operating parameters include: compressor discharge temperature and compressor suction pressure of outdoor units, average superheat of indoor units in cooling operation, and other parameters. Cooling alarm shutdown conditions include: a first number greater than or equal to a threshold for the number of missing indoor units; a compressor discharge temperature less than a low discharge temperature threshold; a compressor suction pressure less than a system low pressure threshold; and an average superheat greater than a target superheat for a duration greater than or equal to a first duration threshold.

[0079] Compressor exhaust temperature refers to the exhaust temperature when the outdoor unit's compressor converts the refrigerant into high-temperature, high-pressure gas. A temperature sensor can be added to the compressor's exhaust port to detect the compressor exhaust temperature. Compressor suction pressure refers to the pressure of the outdoor unit's compressor suction. A pressure sensor can be added to the compressor suction port to detect the compressor suction pressure.

[0080] The superheat of a cooling unit is the temperature difference between the outlet and inlet temperatures of a non-missing cooling unit. The average superheat of a cooling unit is the average superheat of all cooling units. The first duration threshold can be set, for example, 30 minutes.

[0081] When the central air conditioner is in cooling mode and the cooling alarm shutdown conditions are met, alarm processing is performed and the central air conditioner is controlled to shut down; when the central air conditioner is in cooling mode and the cooling alarm shutdown conditions are not met, the central air conditioner is controlled to operate.

[0082] For example, the operation mode of the central air conditioner is cooling mode. When it is determined that the first number B is greater than or equal to the threshold value C of the number of missing indoor units (for example, C is 3 units, etc.), if it is determined that the compressor exhaust temperature is less than the exhaust low temperature threshold and the compressor suction pressure is less than the system low pressure threshold (when the central air conditioner is running, the exhaust temperature is too low and the system low pressure is too low, indicating that the refrigerant circulation of this unit is not smooth or there is a refrigerant leak), and it is determined that the average superheat is greater than the target superheat and lasts for the first time threshold (the outlet temperature of the indoor unit of the central air conditioner is higher than the inlet temperature, the cooling effect of the indoor unit is poor, and it cannot meet the user's cooling requirements, indicating that the refrigerant of the central air conditioner at this time is too little, and there may be a refrigerant leak, which has flowed to the missing indoor unit), then it is determined that the cooling alarm shutdown conditions are met, and an alarm process is performed and the central air conditioner is controlled to shut down. The alarm process can adopt a variety of sound, light and other alarm processes. Controlling the shutdown of the central air conditioner can be to control the shutdown of the outdoor unit and the indoor unit, and not allowing the central air conditioner to start.

[0083] By combining the cooling mode and the operating parameters of the central air conditioner to control the operation or shutdown of the central air conditioner, it is allowed to disconnect the missing indoor unit from the central air conditioner without affecting the overall operating reliability of the central air conditioner, so that other indoor units can work normally without affecting the overall cooling operation of the central air conditioner. This can ensure the operating safety of the central air conditioner and improve the reliability of the central air conditioner; it can meet the user's usage needs and improve the user experience.

[0084] Step 402: Control the central air conditioner to operate in heating mode.

[0085] Step 404 , determining whether the heating alarm shutdown condition is met, if yes, proceeding to step 405 , if no, proceeding to step 406 .

[0086] In some embodiments, the operating parameters of the central air conditioner include: the compressor exhaust temperature, compressor suction pressure, and compressor discharge pressure of the outdoor unit. Heating alarm shutdown conditions include: a first number greater than or equal to a threshold for the number of missing indoor units, a compressor exhaust temperature greater than a high exhaust temperature threshold, a compressor suction pressure less than a system low pressure threshold, a compressor exhaust pressure less than or equal to an exhaust pressure threshold and lasting for a duration greater than or equal to a second duration threshold (e.g., 30 minutes), etc. A pressure sensor can be provided at the compressor discharge port to detect the exhaust pressure at the compressor discharge port, i.e., to detect the compressor exhaust pressure.

[0087] When the central air conditioner is in heating mode and the heating alarm shutdown conditions are met, alarm processing is performed and the central air conditioner is controlled to shut down; when the central air conditioner is in heating mode and the heating alarm shutdown conditions are not met, the central air conditioner is controlled to operate.

[0088] For example, the operating mode of the central air conditioner is heating mode. When it is determined that the first number B is greater than or equal to the threshold value C of the number of missing indoor units (for example, C is 3 units, etc.), if it is determined that the compressor exhaust temperature is greater than the exhaust high temperature threshold and the compressor suction pressure is less than the system low pressure threshold (when the central air conditioner is running, the exhaust temperature is too high and the system low pressure is too low, indicating that the refrigerant circulation of this central air conditioner is not smooth or there is a refrigerant leakage), and it is determined that the system bad compressor exhaust pressure is less than the exhaust pressure threshold and lasts for the second time threshold T (the exhaust pressure threshold PH can be 2260kpa, etc., and the high pressure pressure of the heating operation is too low, indicating that the refrigerant amount of the central air conditioner is insufficient, and there may be too much refrigerant leakage and refrigerant flow to the missing indoor unit), it is judged that the heating alarm shutdown conditions are met, and the alarm processing is performed and the central air conditioner is controlled to shut down; the alarm processing can adopt a variety of sound, light and other alarm processing, and controlling the central air conditioner to shut down can be controlling the outdoor unit and the indoor unit to shut down, and the central air conditioner is not allowed to start.

[0089] By combining the heating mode and the operating parameters of the central air conditioner to control the operation or shutdown of the central air conditioner, it is allowed to disconnect the missing indoor unit from the central air conditioner without affecting the overall operational reliability of the central air conditioner, so that other indoor units can work normally without affecting the overall heating operation of the central air conditioner. This can ensure the operational safety of the central air conditioner and improve the reliability of the central air conditioner; it can meet the user's usage needs and improve the user experience.

[0090] FIG5 is a flow chart of controlling the restart of a central air conditioner in some embodiments of the control method of the central air conditioner according to the present disclosure, as shown in FIG5 :

[0091] Step 501: After the central air conditioner is shut down and a unit start-up instruction is received, whether the indoor unit is a second missing indoor unit is determined based on the communication status between the indoor unit and the outdoor unit, and a second number of all second missing indoor units is counted.

[0092] In some embodiments, during the operation of the central air conditioner or after the central air conditioner is controlled to be shut down and a unit startup instruction is received, if it is determined that the communication between the indoor unit and the outdoor unit is interrupted, the indoor unit is determined to be the second missing indoor unit.

[0093] When it is determined that the outdoor unit has not received any data from the indoor unit within a preset time period (e.g., 5 minutes, 10 minutes, 20 minutes, etc.), communication between the indoor unit and the outdoor unit is determined to be interrupted, the indoor unit is identified as a second missing indoor unit, and a second number A of all second missing indoor units is counted, as well as a first number B of all first missing indoor units is counted. After determining the first number B, the first number B is stored in a storage module. Before the central air conditioner is shut down, if the value of the first number B changes, the first number B stored in the storage module is updated. After the central air conditioner is shut down and a unit startup command is received, the second number A of all second missing indoor units is counted. After determining the second number A and when the first number B needs to be counted, the first number B is retrieved from the storage module.

[0094] Step 502: Determine whether to control the central air conditioner to restart according to the operating mode of the central air conditioner and the second number, or according to the operating mode of the central air conditioner and the second number and the first number.

[0095] By controlling the restart of the central air conditioner according to the unit's operating mode and the number of missing indoor units, the operating safety of the central air conditioner can be ensured and the reliability of the central air conditioner startup can be improved.

[0096] In some embodiments, after the central air conditioner is shut down, problems such as power failure or communication failure of the indoor unit can be eliminated manually. After the central air conditioner is shut down, the first number and the second number can be continued to be counted.

[0097] When the operation mode of the central air conditioner is the cooling mode and the cooling start condition is met, it is determined to control the central air conditioner to restart; the cooling start condition includes: the second number is less than the threshold value of the number of missing indoor units, etc.

[0098] For example, after the central air conditioner is shut down, a unit start command is received, and the unit start command indicates cooling mode. When the central air conditioner is in cooling mode, if it is determined that the second number A is less than a threshold value C (C can be 3, for example) of the number of missing indoor units, the central air conditioner is restarted, and the compressor of the outdoor unit and the indoor unit indicated by the unit start command are started.

[0099] When the operation mode of the central air conditioner is the heating mode and the heating start-up condition is met, it is determined to control the central air conditioner to restart; the heating restart condition includes: the difference between the second number and the first number is less than the indoor unit missing number threshold.

[0100] For example, before communication between the indoor and outdoor units is interrupted, the opening information of the electronic expansion valve of the indoor unit is less than or equal to the opening threshold P. Refrigerant and corresponding compressor lubricant are present in these indoor units. After the central air conditioner is shut down and a unit start command is received, the central air conditioner is operating in heating mode. The difference between the second quantity A and the first quantity B is calculated as D.

[0101] The communication between the D indoor units and the outdoor units is in an interrupted state, the throttling devices of the D indoor units cannot be controlled, and before the communication between the D indoor units and the outdoor units is interrupted, the opening information of the electronic expansion valves of the D indoor units is less than or equal to the opening threshold; when D is greater than the threshold for the number of missing indoor units, since each of the D indoor units contains refrigerant and corresponding compressor lubricant, it may cause the amount of refrigerant in the central air-conditioning to be too low, affecting the safe operation of the central air-conditioning; if it is determined that D is less than the threshold for the number of missing indoor units C (C can be 3, etc.), it usually does not affect the safe operation of the central air-conditioning, and it is determined to control the central air-conditioning to restart, and start the compressor of the outdoor unit and the indoor unit indicated by the unit start instruction.

[0102] By controlling the restart of the central air conditioner according to the number of missing indoor units in cooling or heating mode, the operating safety of the central air conditioner can be ensured and the reliability of the central air conditioner can be improved.

[0103] In some embodiments, after the central air conditioner is restarted, a determination is made as to whether to control the central air conditioner to operate at full power based on the central air conditioner's operating mode, the second quantity, and the compressor's operating time, or based on the central air conditioner's operating mode, the second quantity and the first quantity, and the compressor's operating time. Full power operation may include controlling all indoor units that are communicating normally with the outdoor unit to operate at full power, controlling the opening of the expansion valves of the indoor units that are communicating normally with the outdoor unit to a maximum or a preset opening, and controlling the operating power of the compressor to a maximum or a preset power.

[0104] During the operation of the central air conditioner, the compressor's lubricating oil will be discharged from the compressor through the refrigerant gas and enter the evaporator, piping, condenser, etc. of the central air conditioner. By bringing this part of the lubricating oil back to the compressor, the dynamic balance of the compressor's lubricating oil can be maintained, avoiding the situation where the compressor is damaged due to lack of oil. Controlling the central air conditioner to run at full power can improve the reliability of the central air conditioner.

[0105] When an indoor unit of a central air conditioner is missing for a period of time, the missing indoor unit may store refrigerant. To ensure the reliability of the unit, after the missing indoor unit is restored and the compressor of the unit is restarted, the entire central air conditioner is fully opened and oil recovery control can be performed.

[0106] When the operating mode of the central air conditioner is cooling mode, and the missing time of the first indoor unit is greater than or equal to the first missing time threshold, and the operating time of the compressor is greater than or equal to the first operating time threshold, it is determined to control the central air conditioner to run at full power; wherein, the first indoor unit missing confirmation moment is the moment when it is first confirmed that the second number is greater than or equal to the indoor unit missing number threshold, and the first indoor unit missing time is the time between the current moment and the first indoor unit missing confirmation moment.

[0107] For example, if the central air conditioner is in cooling mode, the first indoor unit missing confirmation moment is the moment when the second number is first confirmed to be greater than or equal to the indoor unit missing number threshold. That is, when it is determined that the second number A ≥ the indoor unit missing number threshold C, the current system time is recorded as the first indoor unit missing confirmation moment. The first indoor unit missing duration is calculated as the duration between the current time and the first indoor unit missing confirmation moment (during the first indoor unit missing duration, the central air conditioner can be in the operating or shutdown state). The current time can be the current system time of the central air conditioner.

[0108] When the first indoor unit missing confirmation time is greater than or equal to the first missing duration threshold T1 (T1 can be 2 hours, for example), and the compressor operating time is greater than or equal to the first operating time threshold T2 (T2 can be 5 minutes, for example), the central air conditioner is controlled to operate at full capacity. For example, controlling the central air conditioner to operate at full capacity can be to control all functioning indoor units to operate for a period of time to ensure normal recovery of the compressor's lubricating oil and improve the reliability of the central air conditioner's operation.

[0109] When the operation mode of the central air conditioner is the heating mode, and the missing time of the second indoor unit is greater than or equal to the second missing time threshold, and the operating time of the compressor is greater than or equal to the second operating time threshold, it is determined to control the central air conditioner to run at full power; wherein, the missing time of the second indoor unit is the time between the current moment and the second indoor unit missing confirmation moment; the second indoor unit missing confirmation moment is the moment when it is first confirmed that the difference between the second number and the first number is greater than or equal to the indoor unit missing number threshold.

[0110] For example, if the central air conditioner is operating in heating mode, the second indoor unit missing confirmation moment is the moment when it is first confirmed that the difference between the second number and the first number is greater than or equal to the indoor unit missing number threshold. That is, when it is determined that the difference D between the second number A and the first number B is ≥ the indoor unit missing number threshold C, the current system time is recorded as the second indoor unit missing confirmation moment; the second indoor unit missing duration is calculated as the duration between the current moment and the second indoor unit missing confirmation moment (during the second indoor unit missing duration, the central air conditioner is in the running or stopped state). The current moment can be the current system time of the central air conditioner.

[0111] When the second indoor unit's absence duration is greater than or equal to a second absence duration threshold T2 (T2 can be 3 hours, for example), and the compressor's operating duration is greater than or equal to a second operating duration threshold T3 (T3 can be 45 minutes, for example), the central air conditioner is controlled to operate at full capacity. For example, all functioning indoor units may be controlled to operate for a period of time to ensure proper lubricant oil recovery for the compressor and improve the reliability of the central air conditioner's operation.

[0112] By controlling whether the central air conditioner is fully operational according to the duration of missing indoor units, the number of missing indoor units, and the operating time of the compressor in cooling or heating mode and after the central air conditioner is restarted, the recovery of the compressor's lubricating oil can be ensured, the reliability of the central air conditioner's operation can be improved, and the operational safety of the central air conditioner can be guaranteed.

[0113] The control method of the central air conditioner disclosed in the present invention counts the number of missing indoor units according to the unit operation mode, the communication status between the indoor unit and the outdoor unit, and the opening of the throttling device of the indoor unit, and controls the operation or shutdown of the central air conditioner in combination with the operation status of the unit. When some indoor units are missing, the other indoor units can work normally without affecting the overall operation of the central air conditioner, thereby ensuring the operation safety of the central air conditioner and improving the reliability of the central air conditioner. By controlling the restart of the central air conditioner according to the number of missing indoor units in the cooling or heating mode, and controlling whether the central air conditioner is fully opened after the central air conditioner is restarted according to the length of time the indoor units are missing, the number of missing indoor units and the operation time of the compressor, the recovery of the compressor's lubricating oil can be ensured, thereby improving the reliability of the central air conditioner.

[0114] In some embodiments, as shown in FIG6 , the present disclosure provides a central air conditioner control device 60, comprising an indoor unit missing determination module 61 and a control execution module 62. The indoor unit missing determination module 61 determines whether an indoor unit is a first missing indoor unit based on the central air conditioner's operating mode, the communication status between the indoor and outdoor units, and the opening of the indoor unit's throttle device, and counts a first number of all first missing indoor units. The control execution module 62 executes control processing on the central air conditioner based on the central air conditioner's operating mode, the first number, and the central air conditioner's operating parameters.

[0115] In some embodiments, when the indoor unit missing determination module 61 determines that the communication between the indoor unit and the outdoor unit is interrupted, it obtains the opening information of the throttling device before the communication is interrupted; the indoor unit missing determination module 61 determines whether the indoor unit is the first missing indoor unit based on the operating mode and opening information of the central air conditioner.

[0116] For example, the indoor unit missing determination module 61 determines that the indoor unit is the first missing indoor unit when the central air conditioner is in cooling mode and the opening information is not 0. The indoor unit missing determination module 61 determines that the indoor unit is the first missing indoor unit when the central air conditioner is in heating mode and the opening information is greater than an opening threshold.

[0117] In some embodiments, the control execution module 62 performs an alarm process and controls the central air conditioner to shut down if the central air conditioner is in cooling mode and meets cooling alarm shutdown conditions. The cooling alarm shutdown conditions include: a first number greater than or equal to a threshold for the number of missing indoor units, a compressor exhaust temperature less than a low exhaust temperature threshold, a compressor suction pressure less than a system low pressure threshold, an average superheat greater than a target superheat and lasting for a duration greater than or equal to a first duration threshold. If the central air conditioner is in cooling mode and the cooling alarm shutdown conditions are not met, the control execution module 62 controls the central air conditioner to operate.

[0118] If the central air conditioner is in heating mode and the heating alarm shutdown conditions are met, the control execution module 62 initiates an alarm and controls the central air conditioner to shut down. The heating alarm shutdown conditions include: a first number greater than or equal to a threshold for the number of missing indoor units, a compressor exhaust temperature greater than a high exhaust temperature threshold, a compressor suction pressure less than a system low pressure threshold, and a compressor exhaust pressure less than or equal to a discharge pressure threshold for a duration greater than or equal to a second duration threshold. If the central air conditioner is in heating mode and the heating alarm shutdown conditions are not met, the control execution module 62 controls the central air conditioner to operate.

[0119] In some embodiments, as shown in FIG7 , the central air conditioner control device 60 further includes a restart control module 63 and an oil return control module 64. After controlling the central air conditioner to shut down and receiving a unit startup command, the indoor unit missing determination module 61 determines whether the indoor unit is a second missing indoor unit based on the communication status between the indoor unit and the outdoor unit, and counts the second number of all second missing indoor units and the first number. The indoor unit missing determination module 61 may determine that the indoor unit is a second missing indoor unit if it determines that communication between the indoor unit and the outdoor unit is interrupted.

[0120] The restart control module 63 determines whether to control the central air conditioner to restart according to the operation mode of the central air conditioner and the second number, or according to the operation mode of the central air conditioner and the second number and the first number.

[0121] For example, the restart control module 63 determines to control the central air conditioner to restart when the operation mode of the central air conditioner is the cooling mode and the cooling start condition is met; the cooling start condition includes: the second number is less than the indoor unit missing number threshold.

[0122] The restart control module 63 determines to control the central air conditioner to restart when the central air conditioner is in heating mode and the heating start-up conditions are met; the heating restart conditions include: the difference between the second number and the first number is less than the indoor unit missing number threshold.

[0123] In some embodiments, after the central air conditioner is restarted, the oil return control module 64 determines whether to control the central air conditioner to run at full power based on the operating mode of the central air conditioner, the second quantity, and the operating time of the compressor, or based on the operating mode of the central air conditioner, the second quantity and the first quantity, and the operating time of the compressor.

[0124] For example, when the operating mode of the central air conditioner is the cooling mode, and the missing time of the first indoor unit is greater than or equal to the first missing time threshold, and the operating time of the compressor is greater than or equal to the first operating time threshold, the oil return control module 64 determines to control the central air conditioner to run at full power; wherein the missing time of the first indoor unit is the time between the current moment and the first indoor unit missing confirmation moment; the first indoor unit missing confirmation moment is the moment when it is first confirmed that the second number is greater than or equal to the indoor unit missing number threshold.

[0125] The oil return control module 64 determines to control the central air conditioner to run at full power when the operating mode of the central air conditioner is the heating mode, and the missing time of the second indoor unit is greater than or equal to the second missing time threshold, and the operating time of the compressor is greater than or equal to the second operating time threshold; wherein the missing time of the second indoor unit is the time between the current moment and the second indoor unit missing confirmation moment; the second indoor unit missing confirmation moment is the moment when it is first confirmed that the difference between the second number and the first number is greater than or equal to the indoor unit missing number threshold.

[0126] In some embodiments, as shown in FIG8 , a central air conditioner control device may include a memory 801, a processor 802, a communication interface 803, and a bus 804. The memory 801 is used to store instructions, and the processor 802 is coupled to the memory 801. The processor 802 is configured to execute the instructions stored in the memory 801 to implement the aforementioned central air conditioner control method.

[0127] Memory 801 can be high-speed RAM, non-volatile memory, or a memory array. Memory 801 can also be divided into blocks, and the blocks can be combined into virtual volumes according to certain rules. Processor 802 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the central air conditioning control method disclosed herein.

[0128] In some embodiments, the present disclosure provides a central air conditioner, including a central air conditioner control device as described in any of the above embodiments. The central air conditioner control device can be deployed in a variety of ways. For example, the central air conditioner control device can be independently provided or integrated with an outdoor unit controller.

[0129] In some embodiments, the present disclosure provides a computer-readable storage medium storing computer instructions. When the instructions are executed by a processor, the method in any of the above embodiments is implemented.

[0130] In some embodiments, the present disclosure provides a computer program, comprising: instructions, which, when executed by a processor, cause the processor to perform the method in any of the above embodiments.

[0131] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive enumeration) of readable storage media can include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0132] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram and the combination of the processes and / or boxes in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0133] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0134] The control method, device, central air conditioner, storage medium and computer program of the central air conditioner in the above-mentioned embodiments can count the number of missing indoor units according to the operating mode, the communication status between the indoor unit and the outdoor unit and the opening degree of the throttling device of the indoor unit, and control the operation or shutdown of the multi-split unit in combination with the operating conditions. When some indoor units are missing, the other indoor units can work normally without affecting the overall operation of the central air conditioner, thereby ensuring the operational safety of the central air conditioner and improving the reliability of the central air conditioner; by controlling the restart of the central air conditioner according to the number of missing indoor units in the cooling or heating mode, and after the central air conditioner restarts, controlling whether the central air conditioner is fully opened according to the length of time the indoor units are missing, the number of missing indoor units and the operating time of the compressor, the recovery of the compressor's lubricating oil can be ensured, thereby improving the reliability of the central air conditioner operation; it can meet the user's usage needs and improve the user's usage experience.

[0135] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0136] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments are sufficient. For system embodiments, since they largely correspond to method embodiments, their description is relatively simple. For relevant parts, references to the description of the method embodiments are sufficient.

[0137] The block diagrams of the devices, devices, equipment, and systems involved in this disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0138] It should also be noted that in the apparatus, device, and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0139] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0140] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, it will be understood by those skilled in the art that the above embodiments are merely illustrative and do not limit the scope of the present disclosure. It will be understood by those skilled in the art that the above embodiments may be combined, modified, or replaced without departing from the scope and essence of the present disclosure.

Claims

1. A control method for a central air conditioner, the central air conditioner including an outdoor unit and an indoor unit, the method comprising: Judging whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner, the communication state between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit, and counting the first quantity of all the first missing indoor units; Performing a control process on the central air conditioner based on the operation mode of the central air conditioner, the first quantity, and the operation parameters of the central air conditioner.

2. The control method of the central air conditioner according to claim 1, wherein, The judging whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner, the communication state between the indoor unit and the outdoor unit, and the opening information of the throttling device of the indoor unit includes: When it is determined that the communication between the indoor unit and the outdoor unit is interrupted, obtaining the opening information of the throttling device before the communication interruption; Judging whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner and the opening information.

3. The control method of the central air conditioner according to claim 2, wherein, The judging whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner and the opening information includes: When the operation mode of the central air conditioner is the cooling mode and the opening information is not 0, determining that the indoor unit is a first missing indoor unit.

4. The control method of the central air conditioner according to claim 2 or 3, wherein, The judging whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner and the opening information includes: When the operation mode of the central air conditioner is the heating mode and the opening information is greater than the opening threshold value, determining that the indoor unit is a first missing indoor unit.

5. The control method of the central air conditioner according to any one of claims 1 to 4, wherein, The operation parameters include: the compressor exhaust temperature and compressor suction pressure of the outdoor unit, and the average superheat degree of the indoor units performing cooling operation; the performing a control process on the central air conditioner based on the operation mode of the central air conditioner, the first quantity, and the operation parameters of the central air conditioner includes: When the operation mode of the central air conditioner is the cooling mode and the cooling alarm shutdown condition is satisfied, performing an alarm process and controlling the central air conditioner to shut down; Wherein, the cooling alarm shutdown condition includes all of the following options: the first quantity is greater than or equal to the indoor unit missing quantity threshold, the compressor exhaust temperature is less than the exhaust low temperature threshold, the compressor suction pressure is less than the system low pressure threshold value, the average superheat degree is greater than the target superheat degree and the duration is greater than or equal to the first duration threshold.

6. The control method for a central air conditioner according to claim 5, comprising: When the operation mode of the central air conditioner is the cooling mode and the cooling alarm shutdown condition is not satisfied, controlling the central air conditioner to operate.

7. The control method of the central air conditioner according to any one of claims 1 to 6, wherein, The operation parameters include: the compressor exhaust temperature, compressor suction pressure, and compressor exhaust pressure of the outdoor unit; the performing a control process on the central air conditioner based on the operation mode of the central air conditioner, the first quantity, and the operation parameters of the central air conditioner includes: When the operation mode of the central air conditioner is the heating mode and the heating alarm shutdown condition is satisfied, performing an alarm process and controlling the central air conditioner to shut down; Among them, the heating alarm shutdown conditions include all of the following options: the first quantity is greater than or equal to the indoor unit missing quantity threshold, the compressor discharge temperature is greater than the exhaust high temperature threshold, the compressor suction pressure is less than the system low pressure threshold, the compressor discharge pressure is less than or equal to the exhaust pressure threshold and the duration is greater than or equal to the second duration threshold.

8. The control method of the central air conditioner according to claim 7, comprising: When the operation mode of the central air conditioner is the heating mode and the heating alarm shutdown conditions are not met, controlling the central air conditioner to operate.

9. The control method of the central air conditioner according to any one of claims 5 to 8, further comprising: After controlling the central air conditioner to shut down and receiving a unit start instruction, judging whether the indoor unit is a second missing indoor unit according to the communication state between the indoor unit and the outdoor unit, and counting the second quantity of all the second missing indoor units and the first quantity; Determining whether to control the central air conditioner to restart according to the operation mode of the central air conditioner and the second quantity, or according to the operation mode of the central air conditioner and the second quantity and the first quantity.

10. The control method of the central air conditioner according to claim 9, wherein the determining whether to control the central air conditioner to restart comprises: When the operation mode of the central air conditioner is the cooling mode and the cooling start conditions are met, determining to control the central air conditioner to restart; Among them, the cooling start conditions include: the second quantity is less than the indoor unit missing quantity threshold.

11. The control method of the central air conditioner according to claim 9 or 10, wherein the determining whether to control the central air conditioner to restart comprises: When the operation mode of the central air conditioner is the heating mode and the heating start conditions are met, determining to control the central air conditioner to restart; Among them, the heating restart conditions include: the difference between the second quantity and the first quantity is less than the indoor unit missing quantity threshold.

12. The control method of the central air conditioner according to any one of claims 9 to 11, wherein the judging whether the indoor unit is a second missing indoor unit according to the communication state between the indoor unit and the outdoor unit comprises: When it is determined that the communication between the indoor unit and the outdoor unit is interrupted, determining that the indoor unit is a second missing indoor unit.

13. The control method of the central air conditioner according to any one of claims 9 to 12, further comprising: After the central air conditioner restarts, judging whether to control the central air conditioner to operate in full load according to the operation mode of the central air conditioner, the second quantity, the operation duration of the compressor, or according to the operation mode of the central air conditioner, the second quantity and the first quantity, the operation duration of the compressor.

14. The control method of the central air conditioner according to claim 13, wherein the judging whether to control the central air conditioner to operate in full load comprises: When the operation mode of the central air conditioner is the cooling mode, the first indoor unit missing duration is greater than or equal to the first missing duration threshold, and the operation duration of the compressor is greater than or equal to the first operation duration threshold, determining to control the central air conditioner to operate in full load; Wherein, the duration of the first indoor unit missing is the duration between the current moment and the moment when the first indoor unit missing is confirmed; the moment when the first indoor unit missing is confirmed is the moment when it is first confirmed that the second quantity is greater than or equal to the indoor unit missing quantity threshold.

15. The control method of the central air conditioner according to claim 13 or 14, wherein determining whether to control the central air conditioner to operate in full load includes: When the operation mode of the central air conditioner is the heating mode, and the duration of the second indoor unit missing is greater than or equal to the second missing duration threshold and the operation duration of the compressor is greater than or equal to the second operation duration threshold, it is determined to control the central air conditioner to operate in full load; Wherein, the duration of the second indoor unit missing is the duration between the current moment and the moment when the second indoor unit missing is confirmed; the moment when the second indoor unit missing is confirmed is the moment when it is first confirmed that the difference between the second quantity and the first quantity is greater than or equal to the indoor unit missing quantity threshold.

16. A control device of a central air conditioner, the central air conditioner includes an outdoor unit and indoor units, and the control device includes: An indoor unit missing determination module, configured to determine whether the indoor unit is a first missing indoor unit according to the operation mode of the central air conditioner, the communication state between the indoor unit and the outdoor unit And the opening information of the throttling device of the indoor unit, and count the first quantity of all the first missing indoor units; A control execution module, configured to perform control processing on the central air conditioner based on the operation mode of the central air conditioner, the first quantity, and the operation parameters of the central air conditioner.

17. A control device of a central air conditioner includes: A memory; And a processor coupled to the memory, the processor is configured to execute the method according to any one of claims 1 to 15 based on instructions stored in the memory.

18. A central air conditioner includes: The control device of the central air conditioner according to claim 16 or 17.

19. A computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to perform the method according to any one of claims 1 to 15.

20. A computer program includes: Instructions that, when executed by a processor, cause the processor to execute the data transmission method according to any one of claims 1-15.

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