Control method, control device and multi-connected system for multi-connected system

Abstract

The present disclosure provides a control method, control device, and multi-split system for a multi-split system. The control method includes: obtaining information about the opening degree of throttle elements in a predetermined time period before the power outage occurs in some of the indoor units in the multi-split system; and performing control processing on the multi-split system based on the throttle element opening information, according to the operating mode of the multi-split system. This disclosure can improve the operational safety of the multi-split system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a control method, a control device and a multi-split system. Background Art

[0002] When a multi-split air conditioning system is operating, some of the indoor units may lose power. These units will then go offline. In related technologies, if fewer than a set number of indoor units in a multi-split system lose power, the entire system continues to operate. However, if more than the set number of indoor units lose power, the entire system shuts down.

[0003] After the power is cut off for the indoor unit, the electronic expansion valve of the indoor unit will remain at the opening before the power is cut off, and the multi-split system will continue to operate, which may cause too much or too little refrigerant in the system to flow through these powered-off indoor units. If the amount of bypassed refrigerant is not controlled, it may affect the operating safety of the system and may even cause serious liquid backflow and damage to the compressor. Summary of the Invention

[0004] A technical problem solved by the present disclosure is that, in related technologies, after power is cut off to some of the internal units in a multi-split system, the system operation security is relatively low.

[0005] According to one aspect of the present disclosure, a control method for a multi-split system is provided, comprising: in the event that some of the indoor units in the multi-split system are powered off, obtaining information on the opening of throttling elements of the said part of the indoor units within a predetermined time before the power outage; and performing control processing on the multi-split system based on the operating mode of the multi-split system and in accordance with the opening information of the throttling elements.

[0006] In some embodiments, the operating mode is a heating mode; based on the operating mode of the multi-split system and according to the opening information of the throttling element, the control processing of the multi-split system includes: obtaining statistical information of the preset minimum opening of the throttling element of the part of the indoor units that are powered off; and adjusting the opening of the throttling element of at least part of the indoor units in normal operation in the multi-split system except for the part of the indoor units that are powered off based on the statistical information of the preset minimum opening of the throttling element of the part of the indoor units and the opening information of the throttling element of the part of the indoor units within a predetermined time before the power is cut off.

[0007] In some embodiments, adjusting the opening of the throttling elements of at least some of the indoor units in the multi-split system that are operating normally except for the part of the indoor units that are powered off includes: calculating the difference between the statistical information of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off and the opening information of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off; and adjusting the opening of the throttling elements of at least some of the indoor units in the multi-split system that are operating normally except for the part of the indoor units that are powered off according to the difference.

[0008] In some embodiments, adjusting the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system except the part of the indoor units that are powered off according to the difference includes: when the difference is a negative value, reducing the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system; when the difference is a positive value, increasing the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system; and when the difference is 0, controlling the opening of the throttling elements of the normally operating indoor units in the multi-split system to remain unchanged.

[0009] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: the sum of the opening values ​​of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; the statistical information of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off includes: the sum of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off.

[0010] In some embodiments, the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system is adjusted by the following relationship: Among them, O A is the opening value of the throttling element of each of the at least part of the normally operating indoor units after adjustment, B is the opening value of the throttling element of each indoor unit of the at least part of the normally operating indoor units before being adjusted, ΔE is the difference between the sum of the preset minimum openings of the throttling elements of the part of the indoor units that are powered off and the sum of the openings of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off, and M is the number of the at least part of the indoor units that are adjusted in the multi-connected system.

[0011] In some embodiments, the opening information of the throttling element of the part of the indoor unit within the predetermined time before the power is cut off includes: the average value of the opening of the throttling element of the part of the indoor unit within the predetermined time before the power is cut off; the statistical information of the preset minimum opening of the throttling element of the part of the indoor unit that is powered off includes: the average value of the preset minimum opening of the throttling element of the part of the indoor unit that is powered off.

[0012] In some embodiments, the number of normally operating indoor units in the multi-split system except for the part of the indoor units that are powered off is greater than or equal to the number of the indoor units that are powered off; adjusting the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system except for the part of the indoor units that are powered off according to the difference includes: adjusting the opening of the throttling element of each of the normally operating indoor units in all the normally operating indoor units in the multi-split system, the number of which is equal to the number of the part of the indoor units that are powered off, by the following relationship: A =O′ B +ΔE′, where O′ A is the opening value of each throttling element of the indoor unit after adjustment, O' B is the opening value of the throttling element of each indoor unit in the throttling elements of the indoor units that need to be adjusted before being adjusted, and ΔE′ is the difference between the average value of the preset minimum opening of the throttling elements of the said part of indoor units that are powered off and the average value of the opening of the throttling elements of the said part of indoor units within the predetermined time before the power is cut off.

[0013] In some embodiments, the operating mode is a cooling mode; based on the operating mode of the multi-split system and according to the opening information of the throttling element, control processing is performed on the multi-split system, including: comparing the opening information of the throttling element of the part of the indoor unit within a predetermined time before power failure with a preset comparison value; and performing control processing on the multi-split system according to the comparison result.

[0014] In some embodiments, performing control processing on the multi-split system based on the comparison result includes: when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power is cut off is greater than or equal to the comparison value, performing shutdown processing on the multi-split system, or reducing the frequency of the compressor running in the multi-split system; and when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power is cut off is less than the comparison value, controlling the multi-split system to operate normally, or reducing the frequency of the compressor running in the multi-split system.

[0015] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power outage includes: the average value of the opening of the throttling elements of the part of the indoor units within the predetermined time before the power outage, or the sum of the openings of the throttling elements of the part of the indoor units within the predetermined time before the power outage.

[0016] In some embodiments, the control method further includes: when some of the indoor units of the multi-split system fail, obtaining the failure type of the failed indoor units; and performing control processing on the multi-split system according to the failure type.

[0017] In some embodiments, the fault types include: a fault in which the throttling element can continue to be controlled and a fault in which the throttling element cannot continue to be controlled.

[0018] In some embodiments, performing control processing on the multi-split system according to the fault type includes: when the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operating mode of the multi-split system; and when the fault type of the faulty indoor unit is a fault in which the throttling element cannot continue to be controlled, treating the faulty indoor unit as a power-off indoor unit to perform control processing on the multi-split system.

[0019] In some embodiments, when the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operating mode of the multi-split system includes: when the operating mode is a heating mode, adjusting the opening of the throttling element of the faulty indoor unit to a preset minimum opening; and when the operating mode is a cooling mode, adjusting the opening of the throttling element of the faulty indoor unit to 0.

[0020] In some embodiments, performing control processing on the multi-split system includes: adjusting the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system except the part of the indoor units that are powered off; performing shutdown processing on the multi-split system; controlling the normal operation of the multi-split system; or adjusting the frequency of the compressor running in the multi-split system.

[0021] In some embodiments, the throttling element includes an electronic expansion valve.

[0022] According to another aspect of the present disclosure, a control device for a multi-split system is provided, comprising: an acquisition unit for acquiring, when some of the indoor units in the multi-split system are powered off, information on the opening of the throttling elements of the said part of the indoor units within a predetermined time before the power outage; and a control processing unit for performing control processing on the multi-split system based on the operating mode of the multi-split system and in accordance with the opening information of the throttling elements.

[0023] According to another aspect of the present disclosure, a control device for a multi-connected system is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the aforementioned control method based on instructions stored in the memory.

[0024] According to another aspect of the present disclosure, a multi-connected system is provided, comprising: the control device as described above.

[0025] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the control method as described above is implemented.

[0026] In the above control method, since emergency control processing is performed on the multi-split system based on the operating mode of the multi-split system and according to the opening information of the throttling element of the powered-off indoor unit, the method can control the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operating safety of the multi-split system.

[0027] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0029] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0030] Figure 1 is a diagram illustrating a control method for a multi-connected system according to some embodiments of the present disclosure;

[0031] Figure 2 The present invention illustrates a control method for a VRF system operating in a heating mode according to some embodiments of the present disclosure;

[0032] Figure 3 The present invention illustrates a control method for a multi-split system operating in a cooling mode according to some embodiments of the present disclosure;

[0033] Figure 4 is a structural block diagram illustrating a control device for a multi-connected system according to some embodiments of the present disclosure;

[0034] Figure 5 is a structural block diagram illustrating a control device for a multi-connected system according to other embodiments of the present disclosure;

[0035] Figure 6is a structural block diagram showing a control device for a multi-connected system according to some other embodiments of the present disclosure. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] 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.

[0042] Figure 1 FIG. 1 is a diagram illustrating a control method for a multi-connected system according to some embodiments of the present disclosure. Figure 1 As shown, the control method includes steps S102 to S104.

[0043] In step S102, when some of the indoor units in the multi-split system are powered off, the opening information of the throttle elements of the indoor units within a predetermined time before the power outage is obtained.

[0044] Here, the predetermined time can be set according to actual needs. For example, the predetermined time can be 0.1 seconds to 5 seconds. Of course, the range of the predetermined time is only exemplary, and the scope of the present disclosure is not limited thereto. For example, when the system is operating normally, the opening information of the indoor unit can be obtained once every certain period of time. In this way, before the indoor unit is powered off, the opening information of the throttling element of each indoor unit stored in the multi-split air-conditioning system is used to obtain the opening information of the throttling element within the predetermined time before the indoor unit is powered off, as the current opening information of the throttling element of the indoor unit after the indoor unit is powered off.

[0045] In some embodiments, the throttling element includes an electronic expansion valve. Of course, those skilled in the art will appreciate that the throttling element may also include other types of expansion valves, and therefore, the scope of the present disclosure is not limited thereto.

[0046] In step S104, based on the operation mode of the multi-split system and according to the opening information of the throttling element, a control process is executed on the multi-split system.

[0047] For example, the operation mode of the multi-split system includes a heating mode and a cooling mode. Here, based on the operation mode of the multi-split system and according to the opening information of the throttle elements of all powered-off indoor units, emergency control processing is performed on the multi-split system.

[0048] In some embodiments, performing control processing on the multi-split system includes: adjusting the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system except the part of the indoor units that are powered off; performing shutdown processing on the multi-split system; controlling the normal operation of the multi-split system; or adjusting the frequency of the compressor running in the multi-split system (for example, reducing the frequency of the compressor running in the multi-split system).

[0049] So far, a control method for a multi-split system according to some embodiments of the present disclosure is provided. The control method includes: in the case where some of the indoor units in the multi-split system are powered off, obtaining the opening information of the throttling elements of the part of the indoor units within a predetermined time before the power outage; and performing control processing on the multi-split system based on the operating mode of the multi-split system and according to the opening information of the throttling elements. In this embodiment, since emergency control processing is performed on the multi-split system based on the operating mode of the multi-split system and according to the opening information of the throttling elements of the powered-off indoor units, the method can control the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operating safety of the multi-split system.

[0050] In some embodiments, the multi-split system operates in a heating mode. In this case, step S104 includes: obtaining statistical information about the preset minimum openings of the throttle elements of the portion of indoor units that are powered off; and adjusting the openings of the throttle elements of at least a portion of the normally operating indoor units in the multi-split system, excluding the portion of indoor units that are powered off, based on the statistical information about the preset minimum openings of the throttle elements of the portion of indoor units and the throttle element opening information of the portion of indoor units within a predetermined time before the power outage.

[0051] In the above embodiment, in the heating mode, when some of the indoor units of the multi-split system are powered off, the opening of the throttling elements of at least some of the indoor units that are not powered off and are operating normally are adjusted based on the statistical information of the preset minimum opening of the throttling elements of all the indoor units that are powered off and the opening information of the throttling elements of all the indoor units that are powered off within a predetermined time before the power outage, so as to control the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operating safety and energy saving of the multi-split system.

[0052] In some embodiments, adjusting the opening of the throttle elements of at least a portion of the normally operating indoor units in the multi-split system, excluding the portion of indoor units that are powered off, includes: calculating a difference between statistical information about a preset minimum opening of the throttle elements of the portion of indoor units that are powered off and information about the opening of the throttle elements of the portion of indoor units that are powered off within a predetermined time period before the power outage; and adjusting the opening of the throttle elements of at least a portion of the normally operating indoor units in the multi-split system, excluding the portion of indoor units that are powered off, based on the difference. In this embodiment, by adjusting the opening of the throttle elements of at least a portion of the normally operating indoor units in the multi-split system based on the calculated difference, the amount of refrigerant flowing through the multi-split system can be controlled overall.

[0053] In some embodiments, adjusting the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system except the part of the indoor units that are powered off according to the difference includes: when the difference is a negative value, reducing the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system; when the difference is a positive value, increasing the opening of the throttling elements of at least a part of the normally operating indoor units in the multi-split system; and when the difference is 0, controlling the opening of the throttling elements of the normally operating indoor units in the multi-split system to remain unchanged.

[0054] In the above embodiment, if the difference is a negative value, it indicates that the opening of the throttle element of the powered-off indoor unit is too large. Since the indoor unit is powered off, the opening of the throttle element of the powered-off indoor unit cannot be controlled. Therefore, the opening of the throttle element of at least a portion of the normally operating indoor units can be controlled to be reduced, thereby balancing the refrigerant flow through the multi-split system as a whole. Conversely, if the difference is a positive value, it indicates that the opening of the throttle element of the powered-off indoor unit is too small. Since the indoor unit is powered off, the opening of the throttle element of the powered-off indoor unit cannot be controlled. Therefore, the opening of the throttle element of at least a portion of the normally operating indoor units can be controlled to be increased, thereby balancing the refrigerant flow through the multi-split system as a whole. If the difference is 0, the opening of the throttle element of the normally operating indoor unit remains unchanged. Therefore, this embodiment can balance the refrigerant flow through the multi-split system as a whole, thereby improving the operational safety and energy efficiency of the multi-split system.

[0055] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: the sum of the opening values ​​of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; the statistical information of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off includes: the sum of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off.

[0056] In this case, in the heating mode, the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system can be adjusted according to the following relationship:

[0057]

[0058] Among them, O A is the opening value of the throttling element of each of the at least part of the normally operating indoor units after adjustment, B is the opening value of the throttle element of each of the at least a portion of the normally operating indoor units before adjustment (i.e., the current opening value), ΔE is the difference between the sum of the preset minimum openings of the throttle elements of the powered-off indoor units and the sum of the openings of the throttle elements of the powered-off indoor units within a predetermined time period before the power outage, and M is the number of the at least a portion of the indoor units being adjusted in the multi-split system. Here, M is a positive integer.

[0059] In the above embodiment, the above difference is the difference between the two sums mentioned above. Therefore, the difference is divided by M, that is, the opening represented by the above difference is evenly distributed to the opening of the throttling element of the normally operating indoor units that need to be adjusted (for example, all normally operating indoor units or part of the normally operating indoor units), thereby controlling the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operating safety and energy saving of the multi-split system.

[0060] In other embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: the average value of the opening of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; the statistical information of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off includes: the average value of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off.

[0061] In this case, in the heating mode, adjusting the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system except the portion of the indoor units that are powered off according to the difference includes adjusting the opening of the throttling element of each of the normally operating indoor units, a number equal to the number of the powered off indoor units, among all the normally operating indoor units in the multi-split system, according to the following relationship:

[0062] O′ A =O′ B +ΔE′, (2)

[0063] Among them, O′ A is the opening value of each throttling element of the indoor unit after adjustment, O' B Where, ΔE′ is the opening value of each throttle element of the indoor units requiring adjustment before adjustment (i.e., the current opening value), and ΔE′ is the difference between the average value of the preset minimum openings of the throttle elements of the portion of indoor units that are powered off and the average value of the openings of the throttle elements of the portion of indoor units during a predetermined period before the power outage. Here, the number of indoor units in the multi-split system operating normally, excluding the portion of indoor units that are powered off, is greater than or equal to the number of indoor units that are powered off.

[0064] In the above embodiment, the above difference is the difference between the two average values ​​described above. Therefore, under the premise that the number of normally operating indoor units in the multi-split system is greater than or equal to the number of powered-off indoor units, normally operating indoor units equal to the number of powered-off indoor units can be obtained (for example, randomly obtained) from all normally operating indoor units. In this way, the opening represented by the above difference is respectively added to the opening of the throttling elements of these selected normally operating indoor units, thereby controlling the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operating safety and energy saving of the multi-split system.

[0065] In other embodiments, the multi-split system operates in cooling mode. In this case, step S104 includes comparing the throttling element opening information of the plurality of indoor units within a predetermined time period before power failure with a preset comparison value; and performing control processing on the multi-split system based on the comparison result.

[0066] In the above embodiment, in the cooling mode, when some of the indoor units of the multi-split system are powered off, control processing is performed on the multi-split system based on the comparison result of the opening information of the throttling elements of the said part of the indoor units within a predetermined time before the power outage with the preset comparison value, and the amount of refrigerant flowing through the multi-split system can be controlled as a whole, thereby improving the operating safety and energy saving of the multi-split system.

[0067] In some embodiments, performing control processing on the multi-split system according to the comparison result includes: when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power is cut off is greater than or equal to the comparison value, performing shutdown processing on the multi-split system, or reducing the frequency of the compressor running in the multi-split system; and when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power is cut off is less than the comparison value, controlling the multi-split system to operate normally, or reducing the frequency of the compressor running in the multi-split system.

[0068] In the above embodiment, if the opening information of the throttling element of the part of the indoor units that are powered off within the predetermined time before the power outage is greater than or equal to the comparison value, the system will bypass too much refrigerant, which will cause damage to the compressor. Therefore, the system can be shut down, or the frequency of the compressor running in the system can be reduced to reduce the impact on the system; if the opening information of the throttling element of the part of the indoor units that are powered off within the predetermined time before the power outage is less than the comparison value, the refrigerant bypassed by the system is not much, and it is assessed that the damage to the compressor is small. Therefore, the system can operate normally, or the frequency of the compressor running in the system can be reduced to reduce the impact on the system.

[0069] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power outage includes: the average value of the opening of the throttling elements of the part of the indoor units within the predetermined time before the power outage, or the sum of the openings of the throttling elements of the part of the indoor units within the predetermined time before the power outage.

[0070] That is, in the cooling mode, the information on the opening degrees of the throttle elements of the portion of indoor units within the predetermined time before power failure may include an average value of the opening degrees of the throttle elements of the portion of indoor units within the predetermined time before power failure, or may include the sum of the opening degrees of the throttle elements of the portion of indoor units within the predetermined time before power failure. Of course, since the average value of the opening degrees is different from the sum of the opening degrees, the corresponding comparison value is also different.

[0071] The inventors of the present disclosure discovered that in the related art, the indoor unit of the multi-split system may malfunction. The consequences of the indoor unit malfunction are similar to those of a power outage in the indoor unit, with the difference being that after the malfunction, the electronic expansion valve of the indoor unit may be closed to 0 (completely closed) or maintain the opening before the malfunction. This is related to the type of malfunction of the indoor unit. Therefore, after the indoor unit malfunctions, it will also affect the operation of the entire system and will affect the indoor unit that continues to operate in cooling or heating mode.

[0072] In view of this, the control method of the embodiment of the present disclosure may further include performing emergency control processing on the event that some of the internal units fail.

[0073] In some embodiments, the control method further includes: when some of the indoor units of the multi-split system fail, obtaining the failure type of the failed indoor units; and performing control processing on the multi-split system according to the failure type.

[0074] In some embodiments, the fault types include: a fault in which the throttling element can continue to be controlled and a fault in which the throttling element cannot continue to be controlled. Table 1 schematically shows the classified fault types of the internal unit.

[0075] Table 1: Classified indoor unit fault types

[0076]

[0077] In some embodiments, performing control processing on the multi-split system according to the fault type includes: when the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operating mode of the multi-split system; and when the fault type of the faulty indoor unit is a fault in which the throttling element cannot continue to be controlled, treating the faulty indoor unit as a power-off indoor unit to perform control processing on the multi-split system.

[0078] For example, when the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operating mode of the multi-split system includes: when the operating mode is the heating mode, adjusting the opening of the throttling element of the faulty indoor unit to a preset minimum opening; and when the operating mode is the cooling mode, adjusting the opening of the throttling element of the faulty indoor unit to 0.

[0079] In the above embodiment, by performing control processing on the multi-split system according to the fault type, different control processing can be performed on the multi-split system based on different fault types, thereby improving the safety of system operation in the event of an internal unit failure.

[0080] Figure 2 The following is a control method for a multi-split system operating in a heating mode according to some embodiments of the present disclosure. Figure 2 As shown, the control method includes steps S202 to S218.

[0081] In step S202, some indoor units are powered off.

[0082] In step S204, the opening information of the throttle element of the powered-off indoor unit within a predetermined time before the power-off is obtained.

[0083] In some embodiments, the opening information of the throttling element of the powered-off indoor unit within a predetermined time before the power is turned off includes: the sum of the openings of the throttling elements of all powered-off indoor units within the predetermined time before the power is turned off.

[0084] In other embodiments, the opening information of the throttling element of the powered-off indoor unit within a predetermined time before the power is cut off includes: an average value of the opening of the throttling element of the powered-off indoor unit within the predetermined time before the power is cut off.

[0085] For example, after some indoor units are powered off, the multi-split system can take the EXV (Electronic Expansion Valve) opening before the powered-off indoor units are disconnected as a statistical value, and sum up the EXV openings of all powered-off indoor units, that is, the sum of the openings of the throttling elements of all powered-off indoor units before the power-off, and then calculate the average EXV opening of the powered-off indoor units, that is, the average value of the openings of the throttling elements of the powered-off indoor units before the power-off.

[0086] For example, the sum of the openings of the electronic expansion valves of all the indoor units before power failure can be recorded as ∑D i , unit is pls, D i is the opening degree of the electronic expansion valve of the i-th indoor unit before the power is turned off, 1≤i≤N, and i is a positive integer, N is the number of indoor units that are powered off, and N is a positive integer. Here, pls is the unit of the opening degree of the electronic expansion valve, which can be understood as the number of steps of the electronic expansion valve. ∑D i That is, it is the sum of the opening degrees of the throttling elements of all the indoor units that are powered off within the predetermined time before the power is cut off.

[0087] For example, the average opening of the electronic expansion valve of the power-off indoor unit is △DE, the unit is pls, then, △DE is the average value of the opening of the throttling element of the indoor unit that is powered off within a predetermined time before the power is cut off.

[0088] In step S206, the difference between the statistical information of the preset minimum opening of the throttle element of the powered-off indoor unit and the opening information of the throttle element of the powered-off indoor unit within a predetermined time before the power-off is calculated.

[0089] In some embodiments, the statistical information of the preset minimum opening of the throttling element of the powered-off indoor unit includes: the sum of the preset minimum opening of the throttling element of the powered-off indoor unit. For example, ZX is the minimum opening of the stopped or shut down indoor unit (in general heating mode, the stopped or shut down indoor unit will maintain an opening for bypassing the refrigerant), and ZX is a constant set value in pls. In this case, the sum of the minimum openings of the electronic expansion valves that should be controlled by all powered-off indoor units can be calculated as ∑ZX i , the unit is pls, where ZX iis the minimum opening of the electronic expansion valve of the i-th power-off indoor unit. Therefore, in this case, the difference ΔE is ΔE = ∑ZX i -∑D i .

[0090] Here, the reason why the electronic expansion valve of the indoor unit has a certain small opening (i.e., the minimum opening) when the indoor unit is stopped or turned off in the heating mode is because in the heating mode, for the indoor unit that is stopped or turned off, if the electronic expansion valve of the indoor unit remains closed, it may cause a large amount of refrigerant and lubricating oil to accumulate in the indoor unit heat exchanger, thereby affecting the reliability and energy saving of the system.

[0091] Here, in some cases, if all the powered-off indoor units are of the same type and the minimum opening degrees of all the powered-off indoor units are equal, then ∑ZX i It is the product of the minimum opening degree of the power-off indoor unit and the number of power-off indoor units.

[0092] In other embodiments, the statistical information of the preset minimum opening of the throttling element of the powered-off indoor unit includes: an average value of the preset minimum opening of the throttling element of the powered-off indoor unit. For example, if the number of powered-off indoor units is N, where N is a positive integer, then the average value of the preset minimum opening of the throttling element of the powered-off indoor unit can be In this case, the difference ΔE′ is

[0093] In step S208, the openings of the throttling elements of at least some of the normally operating indoor units in the multi-split system except the powered-off indoor unit are adjusted according to the difference.

[0094] For example, when the difference ΔE is ΔE=∑ZX i -∑D i In the case of ) Adjust the opening of the throttling element of at least part of the normally operating indoor units in the multi-connected system.

[0095] For example, when the difference ΔE′ is In the case of A =O′ B +ΔE′,), adjust the opening of the throttling element of each of the normally operating indoor units in the multi-split system, the number of which is equal to the number of the part of the indoor units that are powered off.

[0096] Under normal circumstances, the electronic expansion valve of the indoor unit that is shut down or stopped (including the indoor unit that is shut down at a temperature point) will maintain a minimum opening to facilitate the bypass of refrigerant and prevent excessive accumulation of refrigerant in the pipeline and inability to participate in the system circulation. However, after the indoor unit is powered off (the power-off indoor unit here can also include a faulty indoor unit), the electronic expansion valve of the power-off indoor unit can no longer be controlled. The related art does not consider the problem of excessive bypass or too little bypass. In the method of this embodiment, if the opening of the electronic expansion valve of the indoor unit is large before the power is cut off and there is too much bypass, the opening of the electronic expansion valve of the remaining normal indoor unit is reduced to achieve the balance of the refrigerant as a whole; conversely, if the electronic expansion valve of the power-off indoor unit is maintained at a relatively small opening before the power is cut off, the opening of the electronic expansion valve of the normal indoor unit is increased (for example, the maximum opening limit can be 480pls) to achieve the balance of the refrigerant as a whole.

[0097] In step S210, some indoor units fail.

[0098] In step S212, it is determined that the fault type of the faulty indoor unit is a fault in which the throttling element cannot be continuously controlled.

[0099] In step S214, the indoor unit in which the fault has occurred is treated as a powered-off indoor unit.

[0100] In step S216, it is determined that the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled.

[0101] In step S218, the opening of the throttling element of the faulty indoor unit is adjusted to a preset minimum opening, which is the system default minimum opening.

[0102] Here, the indoor unit failure and the indoor unit power outage have similarities and differences, because after the indoor unit fails, the opening of the indoor unit's throttling element (for example, the electronic expansion valve) can sometimes be adjusted, which is related to the type of failure. Therefore, here we consider the failure type of the throttling element that can continue to control the indoor unit and the failure type of the throttling element that cannot continue to control the indoor unit, and distinguish and control the processing of the two types of failures. If the throttling element of the faulty indoor unit can continue to be controlled, it is treated as a normal indoor unit and adjusted to the default minimum opening. The control effect is basically the same as that of a normal indoor unit, which is basically equivalent to shutting down the faulty indoor unit, and does not affect the air-conditioning effect of the normal indoor unit. If the throttling element of the faulty indoor unit has lost control, it is treated as a power-off indoor unit, and the processing method refers to steps S204 to S208.

[0103] Thus, a control method for a VRF system operating in heating mode according to some embodiments of the present disclosure has been provided. Here, by optimizing the control method, the VRF system can ensure continued operation after an indoor unit power outage or failure, thereby improving the unit's operational safety without increasing costs.

[0104] The above control method can effectively control the amount of refrigerant after some indoor units are powered off or fail, and will not bypass too much or too little refrigerant, thereby ensuring the normal operation of the remaining indoor units as much as possible and ensuring the operating safety and energy saving of the unit.

[0105] In the cooling mode, the throttling element (such as the electronic expansion valve) of the indoor unit that is normally shut down basically remains in a normally closed state, and will not cause the refrigerant to bypass.

[0106] Figure 3 FIG. 1 is a diagram showing a control method for a multi-split system operating in cooling mode according to some embodiments of the present disclosure. Figure 3 As shown, the control method includes steps S302 to S320.

[0107] In step S302, some indoor units are powered off.

[0108] In step S304, the opening information of the throttling element of the powered-off indoor unit within a predetermined time before the power-off is obtained.

[0109] In some embodiments, the opening information of the throttle element of the powered-off indoor unit within a predetermined time before the power is turned off includes: an average opening value of the throttle element within the predetermined time before the power is turned off. For example, the average opening value may be the aforementioned ΔDE.

[0110] In other embodiments, the opening information of the throttling element of the powered-off indoor unit within the predetermined time before the power is turned off includes: the sum of the openings of the throttling elements of all powered-off indoor units within the predetermined time before the power is turned off. For example, the sum of the openings can be the aforementioned ∑D i .

[0111] In step S306, it is determined whether the opening information of the throttle element of the powered-off indoor unit within a predetermined time before the power-off is greater than or equal to a preset comparison value. If so, the process proceeds to step S308; otherwise, the process proceeds to step S310.

[0112] Specifically, the throttle element opening information of the powered-off indoor unit within a predetermined time period before the power outage is compared with a preset comparison value, and control processing is performed on the multi-split system based on the comparison result. Here, the comparison value is a constant set value used for comparison and judgment, and the unit is ps. This comparison value can be set according to actual needs, and the scope of this disclosure is not limited to a specific value of the comparison value.

[0113] It should be noted that if the opening information in step 304 is the average opening of the throttle element of the powered-off indoor unit within the predetermined time before the power outage, the comparison value used is a comparison value (which may be referred to as a first comparison value) K. If the opening information in step 304 is the sum of the openings of the throttle elements of all powered-off indoor units within the predetermined time before the power outage, the comparison value used is a comparison value (which may be referred to as a second comparison value) K'. This comparison value K and this comparison value K' may be different. For example, K may be smaller than K'. For example, the comparison value K ranges from 60 pls to 80 pls.

[0114] For the above case where the average value of the opening of the throttling element of the power-off indoor unit is used, the average opening facilitates the above comparison, making the comparison more vivid and reasonable, and avoiding unreasonable judgments due to the opening of one or some indoor units being too large or the opening of one or some indoor units being too small, so that the system can be regulated more accurately.

[0115] In step S308, the multi-split system is shut down, or the frequency of the compressors running in the multi-split system is reduced.

[0116] In step S310, the multi-split system is controlled to operate normally, or the frequency of the compressors in the multi-split system is reduced.

[0117] In step S312, some of the indoor units malfunction.

[0118] In step S314, it is determined that the fault type of the faulty indoor unit is a fault in which the throttling element cannot be continuously controlled.

[0119] In step S316, the indoor unit that has failed is treated as a powered-off indoor unit.

[0120] In step S318, it is determined that the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled.

[0121] In step S320, the opening of the throttling element of the faulty indoor unit is adjusted to 0. As previously mentioned, in cooling mode, the throttling element (e.g., electronic expansion valve) of the shut-down indoor unit generally remains normally closed. Therefore, here, the opening of the throttling element of the faulty indoor unit is adjusted to 0, i.e., the throttling element of the faulty indoor unit is closed.

[0122] Thus, a control method for a VRF system operating in cooling mode according to some embodiments of the present disclosure has been provided. Here, by optimizing the control method, the VRF system can ensure continued operation after an indoor unit power outage or failure, thereby improving the unit's operational safety without increasing costs.

[0123] In the above control method disclosed herein, the cooling mode and the heating mode are controlled differently, thereby making the control of the system more precise and improving the reliability and energy-saving effect of the system.

[0124] Figure 4 FIG. 1 is a block diagram showing a control device for a multi-connected system according to some embodiments of the present disclosure. Figure 4 As shown, the control device includes an acquisition unit 410 and a control processing unit 420.

[0125] The acquisition unit 410 is configured to acquire, when some of the indoor units in the multi-split system are powered off, information on the openings of the throttling elements of the indoor units within a predetermined time period before the power outage.

[0126] The control processing unit 420 is used to perform control processing on the multi-split system based on the operation mode of the multi-split system and according to the opening information of the throttling element.

[0127] Thus, a control device for a multi-split system according to some embodiments of the present disclosure is provided. The control device can control the amount of refrigerant flowing through the multi-split system as a whole, thereby improving the operational safety of the multi-split system.

[0128] In some embodiments, the operating mode is a heating mode. The control processing unit 420 is configured to obtain statistical information about a preset minimum opening of the throttle elements of the portion of indoor units that are powered off, and adjust the opening of the throttle elements of at least a portion of the normally operating indoor units in the multi-split system, excluding the portion of indoor units that are powered off, based on the statistical information about the preset minimum opening of the throttle elements of the portion of indoor units and the opening information of the throttle elements of the portion of indoor units within a predetermined time before the power outage.

[0129] In some embodiments, the control processing unit 420 is used to calculate the difference between the statistical information of the preset minimum opening of the throttling element of the part of the indoor units that is powered off and the opening information of the throttling element of the part of the indoor units within a predetermined time before the power is cut off, and adjust the opening of the throttling element of at least part of the indoor units in the multi-connected system that are normally operating except for the part of the indoor units that are powered off according to the difference.

[0130] In some embodiments, the control processing unit 420 is used to reduce the opening of the throttling elements of at least a portion of the normally operating indoor units in the multi-split system when the difference is a negative value, increase the opening of the throttling elements of at least a portion of the normally operating indoor units in the multi-split system when the difference is a positive value, and control the opening of the throttling elements of the normally operating indoor units in the multi-split system to remain unchanged when the difference is 0.

[0131] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: the sum of the opening values ​​of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; the statistical information of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off includes: the sum of the preset minimum opening values ​​of the throttling elements of the part of the indoor units that are powered off.

[0132] In some embodiments, the control processing unit 420 is configured to adjust the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system according to the following relationship:

[0133]

[0134] Among them, O o is the opening value of the throttling element of each of the at least part of the normally operating indoor units after adjustment, B is the opening value of the throttling element of each indoor unit of the at least part of the normally operating indoor units before being adjusted, ΔE is the difference between the sum of the preset minimum openings of the throttling elements of the part of the indoor units that are powered off and the sum of the openings of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off, and M is the number of the at least part of the indoor units that are adjusted in the multi-connected system.

[0135] In other embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: the average value of the opening of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; the statistical information of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off includes: the average value of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off.

[0136] In other embodiments, the number of normally operating indoor units in the multi-split system excluding the portion of indoor units that are powered off is greater than or equal to the number of powered off indoor units; the control processing unit 420 is configured to adjust the opening of the throttling element of each of the normally operating indoor units in the multi-split system, the number of which is equal to the number of the portion of indoor units that are powered off, according to the following relationship:

[0137] O′ A =O′ B +ΔE′,

[0138] Among them, O′ A is the opening value of each throttling element of the indoor unit after adjustment, O' Bis the opening value of the throttling element of each indoor unit in the throttling elements of the indoor units that need to be adjusted before being adjusted, and ΔE′ is the difference between the average value of the preset minimum opening of the throttling elements of the said part of indoor units that are powered off and the average value of the opening of the throttling elements of the said part of indoor units within the predetermined time before the power is cut off.

[0139] In some embodiments, the operating mode is a cooling mode. The control processing unit 420 is configured to compare the opening information of the throttling elements of the part of the indoor units within a predetermined time before power failure with a preset comparison value, and perform control processing on the multi-split system according to the comparison result.

[0140] In some embodiments, the control processing unit 420 is used to perform shutdown processing on the multi-split system or reduce the frequency of the compressor running in the multi-split system when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power failure is greater than or equal to the comparison value, and to control the normal operation of the multi-split system or reduce the frequency of the compressor running in the multi-split system when the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before the power failure is less than the comparison value.

[0141] In some embodiments, the opening information of the throttling elements of the part of the indoor units within the predetermined time before the power outage includes: the average value of the opening of the throttling elements of the part of the indoor units within the predetermined time before the power outage, or the sum of the openings of the throttling elements of the part of the indoor units within the predetermined time before the power outage.

[0142] In some embodiments, the control processing unit 420 is further configured to obtain the fault type of the faulty indoor unit when a fault occurs in some indoor units of the multi-split system, and to perform control processing on the multi-split system according to the fault type.

[0143] In some embodiments, the fault types include: a fault in which the throttling element can continue to be controlled and a fault in which the throttling element cannot continue to be controlled.

[0144] In some embodiments, the control processing unit 420 is used to adjust the opening of the throttling element of the failed indoor unit according to the operation mode of the multi-split system when the fault type of the failed indoor unit is a fault in which the throttling element can continue to be controlled, and to treat the failed indoor unit as a power-off indoor unit to perform control processing on the multi-split system when the fault type of the failed indoor unit is a fault in which the throttling element cannot continue to be controlled.

[0145] In some embodiments, the control processing unit 420 is used to adjust the opening of the throttling element of the faulty indoor unit to a preset minimum opening when the operating mode is a heating mode, and to adjust the opening of the throttling element of the faulty indoor unit to 0 when the operating mode is a cooling mode.

[0146] In some embodiments, the throttling element includes an electronic expansion valve.

[0147] Figure 5 5 is a block diagram illustrating a control device for a multi-connected system according to other embodiments of the present disclosure. The control device includes a memory 510 and a processor 520.

[0148] The memory 510 can be a disk, flash memory or any other non-volatile storage medium. Figures 1 to 3 At least one of the corresponding embodiments corresponds to the instructions.

[0149] Processor 520 is coupled to memory 510 and can be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. Processor 520 is configured to execute instructions stored in memory to control the overall flow of refrigerant through the VRF system, thereby improving the operational safety of the VRF system.

[0150] In some embodiments, it is also possible to Figure 6 As shown, the control device 600 includes a memory 610 and a processor 620. The processor 620 is coupled to the memory 610 via a BUS 630. The control device 600 can also be connected to an external storage device 650 via a storage interface 640 to access external data, and can also be connected to a network or another computer system (not shown) via a network interface 660, which will not be described in detail here.

[0151] In this embodiment, by storing data instructions in a memory and processing the instructions through a processor, the amount of refrigerant flowing through the multi-split system can be controlled as a whole, thereby improving the operational safety of the multi-split system.

[0152] In some embodiments of the present disclosure, a multi-split system (i.e., a multi-split air conditioning system) is also provided. The multi-split system includes: a control device as described above (e.g., Figure 4 、 Figure 5 or Figure 6 controls shown).

[0153] In some embodiments, the present disclosure further provides a computer-readable storage medium (eg, a non-transitory computer-readable storage medium) having computer program instructions stored thereon, which are executed by a processor to implement Figures 1 to 3The present invention relates to a method according to at least one of the steps of the method in the corresponding embodiment. It should be understood by those skilled in the art that the embodiments of the present disclosure can be provided as methods, apparatuses, or computer program products. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0154] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks 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 instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0155] 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 work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0156] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0157] The present disclosure has been described in detail so far. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0158] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A control method for a multi-connected system, comprising: When some of the indoor units in the multi-split system are powered off, obtaining information on the openings of the throttling elements of the indoor units within a predetermined time before the power outage; and Based on the operation mode of the multi-split system and according to the opening information of the throttling element, a control process is performed on the multi-split system; Wherein, when the operation mode is the heating mode, based on the operation mode of the multi-split system and according to the opening information of the throttling element, the control processing of the multi-split system is performed, including: obtaining statistical information of the preset minimum opening of the throttling element of the part of the indoor units that are powered off; and adjusting the opening of the throttling element of at least part of the indoor units in normal operation in the multi-split system except for the part of the indoor units that are powered off, based on the statistical information of the preset minimum opening of the throttling element of the part of the indoor units and the opening information of the throttling element of the part of the indoor units within a predetermined time before the power is cut off.

2. The control method according to claim 1, wherein: Adjusting the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system except the portion of the indoor units that are powered off includes: Calculating the difference between the statistical information of the preset minimum opening of the throttle elements of the part of the indoor units that are powered off and the opening information of the throttle elements of the part of the indoor units within a predetermined time before the power off; and The opening of the throttling element of at least a part of the normally operating indoor units in the multi-split system except the part of the indoor units that are powered off is adjusted according to the difference.

3. The control method according to claim 2, wherein: Adjusting the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system except the portion of the indoor units that are powered off according to the difference includes: When the difference is a negative value, reducing the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system; When the difference is a positive value, increasing the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system; and When the difference is 0, the opening degree of the throttling element controlling the normally operating indoor unit in the multi-split system remains unchanged.

4. The control method according to claim 2, wherein: The information on the opening degrees of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off includes: a sum of the opening degrees of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off; The statistical information of the preset minimum opening degrees of the throttle elements of the part of the indoor units that are powered off includes: a sum of the preset minimum opening degrees of the throttle elements of the part of the indoor units that are powered off.

5. The control method according to claim 4, wherein: The opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system is adjusted by the following relationship: ， in, is the opening value of the throttling element of each of the at least part of the normally operating indoor units after adjustment, is the opening value of the throttling element of each of the at least part of the normally operating indoor units before adjustment, It is the difference between the sum of the preset minimum openings of the throttling elements of the part of the indoor units that are powered off and the sum of the openings of the throttling elements of the part of the indoor units within a predetermined time before the power off, and M is the number of at least part of the indoor units that are adjusted in the multi-connected system.

6. The control method according to claim 2, wherein: The information on the opening degrees of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off includes: an average value of the opening degrees of the throttling elements of the part of the indoor units within the predetermined time before the power is cut off; The statistical information of the preset minimum opening degrees of the throttling elements of the part of the indoor units that are powered off includes: an average value of the preset minimum opening degrees of the throttling elements of the part of the indoor units that are powered off.

7. The control method according to claim 6, wherein: The number of indoor units in the multi-split system that are in normal operation except for the part of the indoor units that are powered off is greater than or equal to the number of indoor units that are powered off; Adjusting the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system except the portion of the indoor units that are powered off according to the difference includes: The opening degree of the throttling element of each of the normally operating indoor units equal to the number of the powered-off indoor units in all normally operating indoor units of the multi-split system is adjusted according to the following relationship: ， in, The opening value of each throttling element of the indoor unit that needs to be adjusted after the throttling element is adjusted. The opening value of each throttling element of the indoor unit that needs to be adjusted before adjustment, The difference between the average value of the preset minimum opening degrees of the throttle elements of the part of the indoor units that are powered off and the average value of the opening degrees of the throttle elements of the part of the indoor units within a predetermined time before the power off.

8. The control method according to claim 1, wherein: When the operation mode is the cooling mode, performing control processing on the multi-split system based on the operation mode of the multi-split system and according to the opening information of the throttling element includes: comparing the opening information of the throttling elements of the part of the indoor units within a predetermined time before power failure with a preset comparison value; and A control process is executed on the multi-connection system according to the comparison result.

9. The control method according to claim 8, wherein: Executing control processing on the multi-connected system according to the comparison result includes: If the comparison result shows that the opening information of the throttling element of the part of the indoor units within the predetermined time before power failure is greater than or equal to the comparison value, shutting down the multi-split system or reducing the frequency of the compressors in the multi-split system; and When the comparison result is that the opening information of the throttling element of the part of the indoor units within the predetermined time before power failure is less than the comparison value, the multi-split system is controlled to operate normally, or the frequency of the compressor of the multi-split system is reduced.

10. The control method according to claim 8, wherein: The opening information of the throttling elements of some of the indoor units within the predetermined time before power outage includes: the average value of the openings of the throttling elements of some of the indoor units within the predetermined time before power outage, or the sum of the openings of the throttling elements of some of the indoor units within the predetermined time before power outage.

11. The control method according to claim 1, further comprising: When some of the indoor units of the multi-connected system fail, obtaining the failure type of the failed indoor units; and A control process is performed on the multi-connection system according to the fault type.

12. The control method according to claim 11, wherein: The fault types include a fault in which the throttle element can continue to be controlled and a fault in which the throttle element cannot continue to be controlled.

13. The control method according to claim 12, wherein: Executing control processing on the multi-connected system according to the fault type includes: In the case where the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operation mode of the multi-connected system; and In the case where the fault type of the faulty indoor unit is a fault in which the throttling element cannot be continuously controlled, the faulty indoor unit is treated as a power-off indoor unit to perform control processing on the multi-split system.

14. The control method according to claim 13, wherein: When the fault type of the faulty indoor unit is a fault in which the throttling element can continue to be controlled, adjusting the opening of the throttling element of the faulty indoor unit according to the operation mode of the multi-split system includes: When the operation mode is the heating mode, adjusting the opening of the throttling element of the faulty indoor unit to a preset minimum opening; and When the operation mode is the cooling mode, the opening degree of the throttle element of the malfunctioning indoor unit is adjusted to 0.

15. The control method according to claim 1, wherein: The control process for the multi-connection system includes: adjusting the opening of the throttling element of at least a portion of the normally operating indoor units in the multi-split system except the portion of the indoor units that are powered off; Performing shutdown processing on the multi-connection system; Controlling the normal operation of the multi-connection system; or Adjust the frequency of the compressors in the multi-split system.

16. The control method according to any one of claims 1 to 15, wherein: The throttling element includes an electronic expansion valve.

17. A control device for a multi-connected system, comprising: an acquisition unit, configured to, when some of the indoor units in the multi-split system are powered off, acquire information on the openings of the throttling elements of the indoor units within a predetermined time period before the power outage; and a control processing unit, configured to perform control processing on the multi-split system based on an operating mode of the multi-split system and according to information on the opening of the throttling element; Wherein, when the operating mode is the heating mode, the control processing unit is used to obtain statistical information of the preset minimum opening of the throttling elements of the part of the indoor units that are powered off, and adjust the opening of the throttling elements of at least part of the indoor units in the multi-split system that are operating normally except for the part of the indoor units that are powered off based on the statistical information of the preset minimum opening of the throttling elements of the part of the indoor units and the opening information of the throttling elements of the part of the indoor units within a predetermined time before the power is cut off.

18. A control device for a multi-connected system, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the control method according to any one of claims 1 to 16 based on instructions stored in the memory.

19. A multi-connection system comprising: A control device as claimed in claim 17 or 18.

20. A computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the control method according to any one of claims 1 to 16.

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