Air conditioner and multi-split air conditioning system

Abstract

Provided are an air conditioner and a multi-split air conditioning system. The air conditioner comprises a plurality of indoor units (2) and a plurality of outdoor units (1). The plurality of outdoor units (1) are communicatively connected to the plurality of indoor units (2), and the plurality of outdoor units (1) include a master and at least one slave. Any outdoor unit (1) among the plurality of outdoor units (1) comprises an outdoor heat exchanger (11), an air volume coefficient acquisition assembly (12), and a controller (13). The controllers (13) are coupled to the air volume coefficient acquisition assemblies (12); the controllers (13) store load upper limit values of the plurality of outdoor units (1) and configuration parameters of the outdoor heat exchangers (11); and each controller (13) is configured to: receive an air volume coefficient of the corresponding outdoor heat exchanger (11) acquired by the corresponding air volume coefficient acquisition assembly (12), and acquire a heat exchange capability coefficient of the outdoor heat exchanger (11) on the basis of the configuration parameters and the air volume coefficient; acquire the load demand of any indoor unit (2), the load upper limit value of the at least one slave and the heat exchange capacity coefficient; and obtain the operation load of any outdoor unit (1) on the basis of the load demand, the load upper limit value and the heat exchange capability coefficient. The air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger affected by the air volume.

Description

Air conditioners and multi-split systems

[0001] This application claims priority to Chinese patent application No. 202410146371.4 filed on February 1, 2024, and priority to Chinese patent application No. 202410164586.9 filed on February 5, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioner and a multi-split system. Background Art

[0003] The modular multi-split air conditioner includes a plurality of indoor units and a plurality of outdoor units, which are coupled to each other. The plurality of outdoor units each include a controller and at least one compressor, and the controller controls the operation of the at least one compressor and distributes the operating load of the plurality of outdoor units.

[0004] Summary of the Invention

[0005] Due to the unreasonable frequency distribution of the outdoor units of the air conditioners in the multi-split system, when one or more outdoor units have abnormal system pressure or temperature, the frequency reduction protection affects the system efficiency and capacity.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] In one aspect, an air conditioner is provided, comprising a plurality of indoor units and a plurality of outdoor units, wherein the plurality of indoor units are communicatively connected to each other.

[0008] The plurality of outdoor units are communicatively connected to each other and to the plurality of indoor units; the plurality of outdoor units include a master unit and at least one slave unit, the at least one slave unit being communicatively connected to the master unit; and any one of the plurality of outdoor units includes an outdoor heat exchanger, an air volume coefficient acquisition component, and a controller.

[0009] The controller is coupled to the air volume coefficient acquisition component; the controller stores the load upper limits of the multiple outdoor units and the configuration parameters of the outdoor heat exchanger, and is configured to: receive the air volume coefficient of the outdoor heat exchanger acquired by the air volume coefficient acquisition component, acquire the heat exchange capacity coefficient of the outdoor heat exchanger based on the configuration parameters and the air volume coefficient; acquire the load demand of any one of the indoor units, the load upper limit of the at least one slave unit, and the heat exchange capacity coefficient; and obtain the operating load of any one of the outdoor units based on the load demand, the load upper limit, and the heat exchange capacity coefficient. The air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger affected by air volume.

[0010] The air conditioner in some embodiments of the present disclosure distributes the load according to the installation and configuration of each outdoor unit by setting an air volume coefficient acquisition component, thereby improving the efficiency and reliability of multi-split operation.

[0011] In another aspect, an air conditioner is provided, comprising a plurality of indoor units and a plurality of outdoor units, wherein the plurality of indoor units are communicably connected to each other, and the plurality of outdoor units are communicably connected to each other and to the plurality of indoor units.

[0012] The plurality of outdoor units include a master unit and at least one slave unit. The at least one slave unit is communicatively connected to the master unit. Any one of the plurality of outdoor units includes a system pressure acquisition component and a controller.

[0013] The controller is coupled to the system pressure acquisition component, and is configured to: obtain the refrigerant pressure based on the relevant parameters of the refrigerant pressure received by the outdoor unit through the system pressure acquisition component; obtain the load requirements of the multiple indoor units, and obtain the total load requirement based on the load requirements; distribute the total load requirement to the multiple outdoor units; obtain the refrigerant pressure of the multiple outdoor units, and correct the operating loads of the multiple outdoor units based on the refrigerant pressure so that the refrigerant pressures of the multiple outdoor units are at the same level.

[0014] The refrigerant pressure being at the same level satisfies one of the following conditions: the refrigerant pressures of the multiple outdoor units are equal; and the differences between the maximum and minimum refrigerant pressures corresponding to the multiple outdoor units are within the same level threshold range.

[0015] The air conditioner in some embodiments of the present disclosure distributes the load according to the installation and configuration of each outdoor unit by providing a system pressure acquisition component, thereby improving the efficiency and reliability of multi-split operation.

[0016] On the other hand, a multi-split system is provided, comprising a plurality of indoor units and a plurality of outdoor units.

[0017] The multiple indoor units are communicatively connected to each other. The multiple outdoor units are communicatively connected to each other and to the multiple indoor units. The multiple outdoor units include a master unit and at least one slave unit. The at least one slave unit is communicatively connected to the master unit.

[0018] Any one of the plurality of outdoor units includes an outdoor heat exchanger, an air volume coefficient acquisition component, and a controller.

[0019] The controller is coupled to the air volume coefficient acquisition component; the controller stores the load upper limit values ​​of the multiple outdoor units and the configuration parameters of the outdoor heat exchanger, and the controller is configured to: receive the air volume coefficient of the outdoor heat exchanger obtained by the air volume coefficient acquisition component, and obtain the heat exchange capacity coefficient of the outdoor heat exchanger according to the configuration parameters and the air volume coefficient; obtain the load demand of any one of the indoor units, the load upper limit value and the heat exchange capacity coefficient of the at least one slave unit; and obtain the operating load of any one of the outdoor units according to the load demand, the load upper limit value and the heat exchange capacity coefficient.

[0020] Among them, the air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger affected by the air volume; the load upper limit value stored in the controller includes the frequency upper limit values ​​corresponding to the multiple compressors; the operating loads of the multiple outdoor units include the operating frequencies of the multiple compressors.

[0021] In some embodiments of the present disclosure, the multi-split system distributes the load according to the installation and configuration of each outdoor unit by setting an air volume coefficient acquisition component, thereby improving the efficiency and reliability of the multi-split operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a multi-connection system according to some embodiments;

[0023] FIG2 is a block diagram of a multi-connection system according to some embodiments;

[0024] FIG3 is another block diagram of a multi-connection system according to some embodiments;

[0025] FIG4 is a flow chart of a control method for a multi-connected system according to some embodiments;

[0026] FIG5 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0027] FIG6 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0028] FIG7 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0029] FIG8 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0030] FIG9 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0031] FIG10 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0032] FIG11 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0033] FIG12 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0034] FIG13 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0035] FIG14 is another block diagram of a multi-connection system according to some embodiments;

[0036] FIG15 is another block diagram of a multi-connection system according to some embodiments;

[0037] FIG16 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0038] FIG17 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0039] FIG18 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0040] FIG19 is a flow chart of another control method for a multi-connected system according to some embodiments;

[0041] FIG20 is a flow chart of another control method of a multi-connected system according to some embodiments. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings to clearly and completely describe some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0043] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0044] Unless the context requires otherwise, in the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0045] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0046] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0047] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives are used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0048]

Principle of air conditioner

[0049] In some embodiments, the air conditioner includes a compressor 15 , which is configured to compress a low-temperature, low-pressure gas-phase refrigerant into a high-temperature, high-pressure gas-phase refrigerant to assist the air conditioner in performing refrigerant circulation.

[0050] The air conditioner further includes an outdoor heat exchanger configured to one of liquefy or vaporize the refrigerant by exchanging heat between outdoor air and the refrigerant transmitted in the outdoor heat exchanger.

[0051] The air conditioner also includes an indoor heat exchanger, which exchanges heat between indoor air and the refrigerant transported through the indoor heat exchanger to liquefy or vaporize the refrigerant. The air conditioner's refrigerant cycle is implemented by a compressor 15, a condenser, an expansion valve, and an evaporator. This refrigerant cycle involves a series of processes, including compression, condensation, expansion, and evaporation, circulating the refrigerant to the conditioned area to cool or heat the indoor space.

[0052] The low-temperature, low-pressure refrigerant enters the compressor 15, and after being compressed by the compressor 15, it becomes a high-temperature, high-pressure gas-phase refrigerant and is discharged to the condenser (such as an indoor heat exchanger or an outdoor heat exchanger). The condenser condenses the high-temperature, high-pressure gas-phase refrigerant into a liquid-phase refrigerant, and the heat is released to the surrounding environment through the condensation process. The expansion valve expands the high-pressure liquid-phase refrigerant condensed by the condenser into a low-pressure gas-liquid two-phase refrigerant. The evaporator (such as an outdoor heat exchanger or an indoor heat exchanger) evaporates the low-pressure gas-liquid two-phase refrigerant to form a low-temperature, low-pressure gas-phase refrigerant, and the low-temperature, low-pressure gas-phase refrigerant returns to the compressor 15. Here, the evaporator can achieve a cooling effect on the material by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0053] In some embodiments, the outdoor unit of the air conditioner (e.g., the outdoor unit) refers to the portion of the refrigerant cycle that includes the compressor 15 and the outdoor heat exchanger, and the indoor unit of the air conditioner (e.g., the indoor unit) refers to the portion of the refrigerant cycle that includes the indoor heat exchanger. The expansion valve can be provided in either the indoor unit or the outdoor unit.

[0054] The air conditioner can adjust the temperature of the indoor unit during the entire refrigerant cycle. When the indoor heat exchanger is used as a condenser, the air conditioner acts as a heater in heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner acts as a cooler in cooling mode.

[0055]

Modular multi-split air conditioner

[0056] A modular multi-split air conditioner includes multiple indoor units connected in parallel. It also includes multiple outdoor units connected in parallel. The outdoor units are modular, meaning they are integrated into one unit.

[0057] Any one of the plurality of indoor units may include two openings (eg, refrigerant openings), namely, a first opening and a second opening. Any one of the plurality of outdoor units may include two openings, namely, a third opening and a fourth opening.

[0058] The two openings of any one of the multiple indoor units connected in parallel are respectively connected to the two openings of any one of the multiple indoor units connected in parallel, so that the outdoor unit provides refrigerant to the indoor unit and recovers refrigerant from the indoor unit. For example, the first opening is connected to the third opening, and the second opening is connected to the fourth opening. The refrigerant in the outdoor unit is respectively input to the indoor unit through the third opening and the first opening; the refrigerant in the indoor unit is respectively input to the outdoor unit through the second opening and the fourth opening.

[0059] It should be noted that the number of indoor units and the number of outdoor units may be the same or different. In some embodiments, the modular multi-split air conditioner further comprises a bus, and the indoor units and the outdoor units are communicatively connected via the bus.

[0060] A modular multi-split air conditioner determines whether to reduce the compressor frequency by determining whether the exhaust pressure, exhaust temperature, and intake pressure of the compressors of multiple modular outdoor units in the system are greater than or equal to an exhaust pressure threshold, a temperature threshold, or an intake pressure threshold, respectively. Typically, if the exhaust pressure of the compressor of any of the multiple outdoor units exceeds the exhaust pressure threshold or the exhaust temperature exceeds the temperature threshold, the multiple outdoor units are controlled to operate at a reduced frequency. While this ensures the reliability of the modular multi-split air conditioner, it can also reduce the capacity and energy efficiency of the modular multi-split air conditioner. Furthermore, if there are differences in the compressor displacement and outdoor heat exchanger area configurations among the multiple outdoor units—for example, if one of the multiple outdoor units has a smaller outdoor heat exchanger area than the other units but a larger compressor displacement than the other units—the outdoor unit may operate at full or overload. In this case, the frequency of the multiple outdoor units may be reduced, while the remaining outdoor units, excluding the one in question, operate at a lower load, reducing the capacity and energy efficiency of the modular multi-split air conditioner.

[0061] Two allocation methods are provided in the related art. One allocation method is to control the compressor frequencies of multiple outdoor units of the modular multi-split air conditioner to be the same; the other allocation method is to match the frequency of the compressor with the size of the outdoor heat exchanger, and allocate the frequency of the compressor according to the ratio of the highest operating frequency to the average operating frequency of multiple outdoor units. In this way, the capacity and energy efficiency of the modular multi-split air conditioner are improved. However, these two allocation methods do not solve the problem of frequency reduction of the modular multi-split air conditioner due to the failure of one outdoor unit among the multiple outdoor units to operate normally.

[0062] To address the above issues, some embodiments of the present disclosure provide an air conditioner (e.g., a modular multi-split air conditioner). As shown in Figures 1 and 2, the air conditioner includes multiple indoor units 2, which are interconnected and communicatively connected. The air conditioner also includes multiple outdoor units 1, which are interconnected and communicatively connected, and the multiple indoor units 2 are each communicatively connected to the multiple outdoor units 1.

[0063] In some embodiments, multiple outdoor units 1 include a master unit and at least one slave unit, so as to distribute and control the load supply of the outdoor units 1 and the load requirements of the indoor units 2 corresponding to the outdoor units 1, thereby realizing a multi-split system with multiple capabilities. For example, the operating load is supplied and distributed to the master unit and the at least one slave unit based on their capabilities, and the operating load is supplied and distributed to the compressors of the master unit and the at least one slave unit based on the number of compressors corresponding to the master unit and the at least one slave unit.

[0064] It should be noted that the outdoor unit 1 may be an outdoor unit in a multi-split system, and may be set as a master unit or a slave unit.

[0065] In some embodiments, as shown in FIG. 1 , the outdoor unit 1 includes an outdoor heat exchanger 11 .

[0066] In some embodiments, as shown in FIG3 , the outdoor unit 1 further includes a communication component 14 (eg, a communication module), and any one of the plurality of outdoor units 1 can achieve communication connection and communication with the remaining outdoor units 1 and indoor units 2 through the communication component 14 .

[0067] The outdoor unit 1 further includes a controller 13 , which is coupled to a communication component 14 . The controller 13 of the outdoor unit 1 is connected to and communicates with the other outdoor units 1 and the indoor units 2 via the communication component 14 .

[0068] The outdoor unit 1 also includes an air volume coefficient acquisition component 12 (e.g., an air volume coefficient acquisition module). This component 12 is coupled to a controller 13 and configured to acquire the air volume coefficient of the outdoor heat exchanger 11 and transmit it to the controller 13. The air volume coefficient may represent the heat exchange capacity of the outdoor heat exchanger 11 as affected by air volume. The controller 13 stores the load upper limit of the outdoor unit 1 and configuration parameters of the outdoor heat exchanger 11. The load upper limit is the maximum load that the outdoor unit 1 can provide during normal operation.

[0069] In some embodiments, as shown in FIG. 4 , the controller 13 is configured to execute S1 to S4 .

[0070] S1. Receive the air volume coefficient and the configuration parameters of the outdoor heat exchanger 11.

[0071] The controller 13 receives the air volume coefficient from the air volume coefficient acquisition component 12 and acquires configuration parameters of the outdoor heat exchanger 11 .

[0072] Here, the configuration parameter of the outdoor heat exchanger 11 may be the heat exchange area of ​​the outdoor heat exchanger.

[0073] S2. Obtain the heat transfer capacity coefficient based on the air volume coefficient and configuration parameters.

[0074] The controller 13 obtains the heat exchange capacity coefficient of the outdoor heat exchanger 11 according to the configuration parameters and the air volume coefficient of the outdoor heat exchanger 11 .

[0075] S3. Obtain load requirements of multiple indoor units 2, load upper limits and heat exchange capacity coefficients of multiple outdoor units 1 (eg, at least one slave unit).

[0076] S4. Obtain the operating loads of the plurality of outdoor units 1 according to the load demand, the load upper limit value, and the heat exchange capacity coefficient.

[0077] The master controller 13 obtains the load demands of multiple indoor units 2, the load upper limits of multiple outdoor units 1, and the heat exchange capacity coefficient of the outdoor heat exchanger 11, and obtains the load distribution coefficient of any outdoor unit 1 based on the load upper limit of the multiple outdoor units 1 and the heat exchange capacity coefficient of the outdoor heat exchanger 11 corresponding to the outdoor unit 1. In some embodiments, the master controller 13 collects the load demands of multiple indoor units 2 and obtains a total load demand based on the load demands of the multiple indoor units 2. In addition, the master obtains the load distribution coefficient of at least one slave unit, or obtains the load upper limit of at least one slave unit and the heat exchange capacity coefficient of the outdoor heat exchanger 11, and obtains the load distribution coefficient of at least one slave unit based on the load upper limit and the heat exchange capacity coefficient.

[0078] In some embodiments, the total load demand is the sum of the load demands of multiple indoor units 2; and the load distribution coefficient is the product of the load upper limit and the heat exchange capacity coefficient.

[0079] The controller 13 obtains the operating loads of multiple outdoor units 1 (e.g., a master unit and at least one slave unit) based on the total load demand and the load distribution coefficients of the multiple outdoor units 1 (e.g., a master unit and at least one slave unit). In some embodiments of the present disclosure, the outdoor unit 1 obtains its operating load through the air volume coefficient, the upper load limit, the configuration parameters of the outdoor heat exchanger 11, and the load demand of the indoor unit 2. This ensures that, when the modular multi-split air conditioner cannot operate normally due to an installation problem of the outdoor unit 1 causing the heat exchange air volume of the outdoor heat exchanger 11 to be less than the rated air volume, the operating load allocated to the outdoor unit can also ensure that its system parameters during operation are roughly consistent with those of other unaffected outdoor units 1, thereby improving the rationality of the operating load distribution. In addition, the probability of at least one compressor 15 of the multiple outdoor units 1 being subjected to frequency reduction protection due to abnormal system parameters of any of the multiple outdoor units 1 is reduced, thereby improving the operating efficiency and reliability of the modular multi-split air conditioner.

[0080] In some embodiments, the at least one compressor 15 may include one or two compressors 15 , and the at least one compressor 15 is coupled to the controller 13 .

[0081] In some embodiments, as shown in FIG5 , the controller 13 of the host is further configured to execute S5 .

[0082] S5 . Send the operating load to the corresponding plurality of outdoor units 1 to control the operation of the corresponding compressors 15 .

[0083] The controller 13 of the master unit calculates the operating loads of the plurality of outdoor units 1 and transmits the calculated operating loads to the corresponding slave units 1. The master unit and at least one slave unit control the operation of the compressor 15 according to the corresponding operating loads.

[0084] In some embodiments, any one of the plurality of outdoor units 1 includes at least one compressor 15 , the at least one compressor 15 is coupled to the controller 13 , and the frequency upper limit values ​​corresponding to the at least one compressor 15 may be the same or different.

[0085] In some embodiments, the load upper limit value of the outdoor unit 1 stored in the controller 13 includes a frequency upper limit value of at least one compressor 15 , and the operating load of the outdoor unit 1 includes an operating frequency of at least one compressor 15 .

[0086] In some embodiments, as shown in FIG6 , S2 may further include S21 to S22 .

[0087] S21 . Obtain the air volume coefficient, the heat exchange area of ​​the outdoor heat exchanger 11 , and the power of the compressor 15 .

[0088] In some embodiments, the controller 13 further stores compressor power, which is the sum of powers of the compressors 15 of the plurality of outdoor units 1 .

[0089] S22. Calculate the heat exchange capacity coefficient based on the air volume coefficient, the heat exchange area of ​​the outdoor heat exchanger 11, and the compressor power.

[0090] The heat transfer capacity coefficient of the outdoor heat exchanger 11 is defined as Q; the air volume coefficient is defined as A; the heat transfer area is defined as B; and the compressor power is defined as C.

[0091] Then, the heat exchange capacity coefficient Q, air volume coefficient A, heat exchange area B and compressor power C satisfy: Q = A × B / C.

[0092] In some embodiments, the compressor power may be the horsepower of the outdoor unit 1 , that is, the power consumption of the outdoor unit 1 .

[0093] In some embodiments, the outdoor unit 1 further includes a control circuit board, which includes a controller 13 .

[0094] The air volume coefficient acquisition component 12 may be, for example, a plurality of dial switches disposed on a control circuit board. Different dial switches or combinations of dial switches represent different levels of air volume coefficient, and the corresponding relationship between different dial switches and different levels of air volume coefficient is stored in the controller 13. Furthermore, the corresponding installation conditions for different dial switches or combinations of dial switches can be displayed in the product installation guide to facilitate measurement and input, thereby enabling the air volume coefficient acquisition component 12 to obtain the air volume coefficient.

[0095] It should be noted that the air volume coefficient may also be input through other stepless input methods, for example, by providing a variable potentiometer in the circuit of the control circuit board.

[0096] In other embodiments, the outdoor unit 1 further includes a pressure sensor disposed on the outdoor heat exchanger 11. The pressure sensor is coupled to the controller 13 and configured to detect an operating static pressure value of the outdoor heat exchanger 11 and transmit the operating static pressure value to the controller 13. The controller 13 can obtain an air volume coefficient based on the static pressure value corresponding to the rated wind speed and the operating static pressure value. For example, the air volume coefficient is the ratio of the static pressure value to the operating static pressure value.

[0097] The air volume coefficient acquisition component 12 of the outdoor unit 1 in some embodiments of the present disclosure can be obtained through a pressure sensor, which improves the accuracy of the air volume coefficient and the efficiency of obtaining the air volume coefficient, facilitates the collection and measurement of the air volume heat exchange capacity during the service life of the outdoor unit 1, and avoids the unreasonable distribution of operating loads of multiple outdoor units 1 due to abnormal air volume during the operation of the outdoor unit 1.

[0098] In some embodiments, the outdoor unit 1 includes at least one compressor 15, and the controller 13 further stores the compressor displacement of the at least one compressor 15. As shown in Fig. 7 , S4 may further include S41 to S45.

[0099] S41 . Obtain the compressor displacements of multiple outdoor units 1 .

[0100] The controller 13 of the master unit obtains the displacement and compression capacity of the compressor 15 of at least one slave unit in the air conditioner.

[0101] S42. Compare the displacements of multiple compressors.

[0102] S43. When the displacements of multiple compressors are equal, obtain a total operating frequency requirement according to the load requirement.

[0103] S44. Obtain the load upper limit values ​​and heat exchange capacity coefficients of multiple outdoor units 1 (eg, at least one slave unit), and calculate the frequency distribution coefficient based on the load upper limit values ​​and the heat exchange capacity coefficients.

[0104] In some embodiments, the frequency allocation coefficient of compressor 15 is the load allocation coefficient of the corresponding outdoor unit 1. In this case, the frequency allocation coefficient is equal to the product of the upper load limit and the heat exchange capacity coefficient. In some embodiments, the master controller 13 can obtain the upper load limit and heat exchange capacity coefficient of at least one slave through communication with at least one slave, and calculate the frequency allocation coefficient based on the upper load limit and the heat exchange capacity coefficient.

[0105] In other embodiments, the controller 13 of the host may also obtain the frequency allocation coefficient of at least one slave through communication with at least one slave.

[0106] S45 . Calculate the operating load of the outdoor unit 1 according to the frequency allocation coefficient and the total operating frequency requirement.

[0107] The host obtains the frequency upper limit value of at least one slave through communication with at least one slave, obtains one of the heat exchange capacity coefficient or the frequency distribution coefficient of at least one slave, and calculates the operating load of the outdoor unit 1.

[0108] In some embodiments, the operating load of any outdoor unit 1 among the multiple outdoor units 1 is equal to the product of the ratio of the frequency allocation coefficient of the outdoor unit 1 to the sum of the frequency allocation coefficients of the multiple outdoor units 1 and the total operating frequency demand.

[0109] That is, the frequency distribution coefficient of the outdoor unit 1 is equal to the sum of the frequency distribution coefficients of the compressors 15 of multiple outdoor units 1; the upper limit value of the load of the outdoor unit 1 is the sum of the upper limit frequencies of the compressors 15 of the outdoor unit 1; and the operating load of the outdoor unit 1 is the sum of the operating frequencies of the multiple compressors 15 of the outdoor unit 1.

[0110] In some embodiments, as shown in FIG. 8 , after S42 , the controller 13 may be further configured to execute S48 to S412 .

[0111] S48. When the displacements of the multiple compressors are not equal, set a reference displacement, and obtain displacement coefficients of the multiple compressor displacements relative to the reference displacement.

[0112] In some embodiments, the displacement coefficient of any compressor 15 among the plurality of compressors 15 is equal to the ratio of the displacement of the compressor to the reference displacement.

[0113] S49. Obtain a total operating frequency requirement under a reference displacement according to the load requirement.

[0114] The controller 13 of the host obtains the total operating frequency requirement under the reference displacement according to the load requirement of the indoor unit 2 .

[0115] S410 , obtaining displacement coefficients of the plurality of compressor displacements relative to the reference displacement according to the reference displacement and the displacements of the plurality of compressors.

[0116] S411 . Obtain a frequency upper limit value and a heat exchange capacity coefficient of any one of the multiple compressors 15 , and calculate a frequency allocation coefficient based on the displacement coefficient, the heat exchange capacity coefficient, and the frequency upper limit value.

[0117] In some embodiments, the controller 13 of the host unit calculates a frequency allocation coefficient for any one of the compressors 15 of the outdoor unit 1 based on the displacement coefficient, the heat exchange capacity coefficient, and the upper frequency limit. For example, the frequency allocation coefficient is equal to the product of the displacement coefficient, the upper frequency limit, and the heat exchange capacity coefficient.

[0118] S412 , calculating an operating load according to a frequency distribution coefficient, a total operating frequency requirement, and a displacement coefficient of any one of the plurality of compressors 15 .

[0119] The controller 13 of the host calculates the operating frequency, that is, the operating load of the outdoor unit 1 , based on the frequency distribution coefficient of any compressor 15 , the total operating frequency requirement under the reference displacement, and the displacement coefficient.

[0120] For example, the operating frequency of any compressor 15 is equal to the ratio of the frequency allocation coefficient of the compressor 15 to the sum of the frequency allocation coefficients, multiplied by the total operating frequency requirement under the reference displacement and the corresponding displacement coefficient.

[0121] That is, the load upper limits of the plurality of outdoor units 1 include the frequency upper limit of at least one compressor 15 ; and the operating loads of the plurality of outdoor units 1 include the operating frequency of at least one compressor 15 corresponding to the outdoor units 1 .

[0122] In some embodiments, as shown in FIG. 9 , the controller 13 is further configured to execute S51 to S59 .

[0123] S51 : Obtain the displacement of the compressors 15 of the plurality of outdoor units 1 .

[0124] S52: Determine whether the displacements of the multiple compressors 15 are equal. If so, execute S53; if not, execute S56.

[0125] S53. Obtain a total operating frequency requirement based on the load requirement.

[0126] For example, when the displacements of multiple compressors are equal, the total operating frequency requirement is obtained according to the load requirement.

[0127] S54 : Obtain the load upper limit values ​​and heat exchange capacity coefficients of the plurality of outdoor units 1 , and calculate the frequency distribution coefficient according to the load upper limit values ​​and the heat exchange capacity coefficients.

[0128] S55: Calculate the operating load of the outdoor unit 1 according to the frequency allocation coefficient and the total operating frequency requirement.

[0129] S56 : Set a reference displacement, and obtain displacement coefficients of the displacements of the plurality of compressors 15 relative to the reference displacement.

[0130] For example, when the displacements of the plurality of compressors are not equal, a reference displacement is set, and displacement coefficients of the displacements of the plurality of compressors 15 relative to the reference displacement are obtained.

[0131] S57. Obtain a total operating frequency requirement under a reference displacement according to the load requirement and the displacement coefficient.

[0132] S58. Obtain the frequency upper limit value and heat exchange capacity coefficient of any one of the multiple compressors 15, and calculate the frequency allocation coefficient according to the displacement coefficient, heat exchange capacity coefficient and frequency upper limit value.

[0133] S59 , calculating the operating frequency according to the frequency allocation coefficient, the total operating frequency requirement, and the displacement coefficient of any one of the plurality of compressors 15 .

[0134] In some embodiments, the multiple compressors 15 in the same outdoor unit 1 of the air conditioner have the same displacement and the same upper frequency limit.

[0135] In some embodiments, as shown in FIG1 , the outdoor unit 1 further includes a bypass branch 19 , the two ends of which are respectively connected to the exhaust port and the intake port of the compressor 15 . The bypass branch 19 is coupled to the controller 13 , which controls whether the bypass branch 19 is connected or blocked.

[0136] In some embodiments, as shown in FIG3 , the outdoor unit 1 further includes at least one of a first sensor (eg, a high-voltage detection element 16 ) or a second sensor (eg, a temperature detection element 17 ).

[0137] When the outdoor unit 1 includes a first sensor 16, the first sensor 16 is coupled to the controller 13. The first sensor 16 is provided at the exhaust port of the compressor 15 and is configured to detect the exhaust pressure of the compressor 15 and transmit the exhaust pressure to the controller 13.

[0138] When the outdoor unit 1 includes the second sensor 17, the second sensor 17 is coupled to the controller 13. The temperature detecting member 17 is provided at the exhaust port of the compressor 15 and is configured to detect the exhaust temperature of the compressor 15 and transmit the exhaust temperature to the controller 13.

[0139] The outdoor unit 1 further includes a third sensor (e.g., a low pressure detector) 18, which is coupled to the controller 13. The third sensor 18 is disposed at the suction port of the compressor 15 and is configured to detect the suction pressure of the compressor 15 and transmit the suction pressure to the controller 13.

[0140] In some embodiments, as shown in FIG. 10 , the controller 13 is further configured to execute S100 to S108 .

[0141] S100: Configure an exhaust pressure threshold (eg, a high pressure threshold), a temperature threshold, and an intake pressure threshold (eg, a low pressure threshold).

[0142] In some embodiments, the controller 13 further stores an exhaust pressure threshold and a temperature threshold.

[0143] The controller 13 also stores an inhalation pressure threshold value.

[0144] S101. Determine whether the air conditioner is in refrigeration cycle operation. If so, execute S102; if not, execute S106.

[0145] S102: Obtain exhaust pressure and exhaust temperature.

[0146] When the air conditioner is in refrigeration cycle operation, the controller 13 obtains the exhaust pressure through the first sensor 16 and obtains the exhaust temperature through the temperature detection element 17 .

[0147] S103: Determine whether the exhaust pressure is greater than or equal to the exhaust pressure threshold. If so, execute S104; if not, continue to execute S101.

[0148] In some embodiments, the exhaust pressure threshold may be any value between [3.6 MPa, 3.9 MPa].

[0149] S104: Determine whether the exhaust temperature is greater than or equal to the temperature threshold. If so, execute S105; if not, continue to execute S101.

[0150] In some embodiments, the temperature threshold may be any value in the range of [100° C., 110° C.].

[0151] S105. Control the bypass branch to be connected.

[0152] When it is determined that the exhaust pressure is greater than or equal to the exhaust pressure threshold and the exhaust temperature is greater than or equal to the temperature threshold, the controller 13 controls the bypass branch 19 to be connected to relieve the pressure of the compressor.

[0153] S106: Obtain the suction pressure.

[0154] When it is determined that the air conditioner is in a heating cycle operation, the controller 13 obtains the suction pressure of the compressor 15 through the third sensor 18 .

[0155] S107 , determining whether the inhalation pressure is less than or equal to the inhalation pressure threshold; if so, executing S108 ; if not, continuing to execute S101 .

[0156] In some embodiments, the inhalation pressure threshold may be any value between [0.05 MPa and 0.20 MPa].

[0157] S108 , controlling the bypass branch 19 to be connected.

[0158] When it is determined that the suction pressure is less than or equal to the suction pressure threshold, the bypass branch 19 is controlled to be connected to relieve the pressure of the compressor 15 .

[0159] In some embodiments, as shown in FIG. 11 , the controller 13 is further configured to execute S200 to S209 .

[0160] S200: Configure an exhaust pressure threshold, a temperature threshold, and an intake pressure threshold.

[0161] In some embodiments, the controller 13 further stores an exhaust pressure threshold and a temperature threshold. The controller 13 further stores an intake pressure threshold.

[0162] S201. Determine whether the air conditioner is in a refrigeration cycle. If so, execute S202; if not, execute S207.

[0163] S202: Obtain exhaust pressure and exhaust temperature.

[0164] When the air conditioner is in refrigeration cycle operation, the controller 13 obtains the exhaust pressure through the first sensor 16 and obtains the exhaust temperature through the temperature detection element 17 .

[0165] S203: Determine whether the exhaust pressure is greater than or equal to the exhaust pressure threshold. If so, execute S204; if not, execute S205.

[0166] S204 , controlling the bypass branch to be connected.

[0167] When it is determined that the exhaust pressure is greater than or equal to the exhaust pressure threshold, the controller 13 controls the bypass branch 19 to be connected to relieve the pressure of the compressor.

[0168] S205 , determining whether the exhaust temperature is greater than or equal to the temperature threshold; if so, executing S206 ; if not, continuing to execute S201 .

[0169] S206 , controlling the bypass branch to be connected.

[0170] When it is determined that the exhaust gas temperature is greater than or equal to the temperature threshold, the controller 13 controls the bypass branch 19 to be connected to relieve the pressure of the compressor.

[0171] S207: Obtain the suction pressure.

[0172] When it is determined that the air conditioner is in a heating cycle operation, the controller 13 obtains the suction pressure of the compressor 15 through the third sensor 18 .

[0173] S208: Determine whether the inhalation pressure is less than or equal to the inhalation pressure threshold. If so, execute S209; if not, continue to execute S201.

[0174] S209 , controlling the bypass branch 19 to be connected.

[0175] When it is determined that the suction pressure is less than or equal to the suction pressure threshold, the bypass branch 19 is controlled to be connected to relieve the pressure of the compressor 15 .

[0176] In some embodiments, the controller 13 may obtain at least one of the exhaust pressure and the exhaust temperature. In this case, the controller 13 may first execute S205. If the result of S205 is negative, the controller 13 controls execution of S203. That is, if the exhaust temperature is less than the temperature threshold, the controller 13 determines whether the exhaust pressure is greater than or equal to the exhaust pressure threshold.

[0177] In some embodiments, the bypass branch 19 includes a controllable opening solenoid valve, and the controller 13 is configured to control the opening of the controllable opening solenoid valve based on at least one of the degree to which the exhaust pressure is greater than or equal to the exhaust pressure threshold, the degree to which the exhaust temperature is greater than or equal to the temperature threshold, or the degree to which the suction pressure is less than or equal to the suction pressure threshold, thereby controlling the pressure relief degree of the compressor 15.

[0178] In some embodiments, as shown in FIG. 12 , the controller 13 is further configured to execute S300 to S308 .

[0179] S300: Configure the exhaust pressure threshold, temperature threshold, and intake pressure threshold.

[0180] In some embodiments, the controller 13 further stores at least one of an exhaust pressure threshold value or a temperature threshold value. The controller 13 further stores an intake pressure threshold value.

[0181] S301. Determine whether the air conditioner is in a refrigeration cycle. If so, execute S302; if not, execute S306.

[0182] S302: Obtain exhaust pressure and exhaust temperature.

[0183] When the air conditioner is in refrigeration cycle operation, the controller 13 obtains the exhaust pressure through the first sensor 16 and obtains the exhaust temperature through the temperature detection element 17 .

[0184] S303: Determine whether the exhaust pressure is greater than or equal to the exhaust pressure threshold. If so, execute S304; if not, continue to execute S301.

[0185] S304: Determine whether the exhaust temperature is greater than or equal to the temperature threshold. If so, execute S305; if not, continue to execute S301.

[0186] S305 , controlling the compressor 15 to reduce the frequency.

[0187] When it is determined that the exhaust pressure of the compressor 15 is greater than or equal to the exhaust pressure threshold and the exhaust temperature is greater than or equal to the temperature threshold, the controller 13 controls the opening of the controllable opening solenoid valve, for example, reduces the opening of the controllable opening solenoid valve, and thereby controls the compressor 15 to reduce the frequency.

[0188] At this time, the degree of frequency reduction of the compressor 15 is controlled according to at least one of the degree to which the exhaust pressure is greater than or equal to the exhaust pressure threshold, or the degree to which the exhaust temperature is greater than or equal to the temperature threshold.

[0189] For example, when the exhaust pressure is greater than or equal to the exhaust pressure threshold, the frequency reduction amplitude of the compressor 15 may be any value among [1 Hz / s, 3 Hz / s].

[0190] When the exhaust temperature is greater than or equal to the temperature threshold, the frequency reduction amplitude of the compressor 15 can be any value between [1 Hz / s and 3 Hz / s].

[0191] S306: Obtain the suction pressure.

[0192] When it is determined that the air conditioner is in a heating cycle operation, the controller 13 obtains the suction pressure of the compressor 15 through the third sensor 18 .

[0193] S307 , determining whether the inhalation pressure is less than or equal to the inhalation pressure threshold; if so, executing S308 ; if not, continuing to execute S301 .

[0194] S308 , controlling the compressor 15 to reduce the frequency.

[0195] When the air conditioner is in a heating cycle, if it is determined that the suction pressure of the compressor 15 is less than or equal to the suction pressure threshold, the opening of the controllable opening solenoid valve is controlled, for example, the opening of the controllable opening solenoid valve is reduced, thereby controlling the compressor 15 to reduce its frequency.

[0196] At this time, the frequency reduction amplitude of compressor 15 is determined based on the degree to which the suction pressure is less than or equal to the suction pressure threshold. For example, when the suction pressure is less than or equal to the suction pressure threshold, the frequency reduction amplitude of compressor 15 can be any value between [1 Hz / s and 3 Hz / s].

[0197] In some embodiments, as shown in FIG. 13 , the controller 13 is further configured to execute S400 to S409 .

[0198] S400: Configure the exhaust pressure threshold, temperature threshold, and intake pressure threshold.

[0199] In some embodiments, the controller 13 further stores at least one of an exhaust pressure threshold value or a temperature threshold value. The controller 13 further stores an intake pressure threshold value.

[0200] S401. Determine whether the air conditioner is in a refrigeration cycle. If so, execute S402; if not, execute S407.

[0201] S402: Obtain exhaust pressure and exhaust temperature.

[0202] When the air conditioner is in refrigeration cycle operation, the controller 13 obtains the exhaust pressure through the first sensor 16 and obtains the exhaust temperature through the temperature detection element 17 .

[0203] S403: Determine whether the exhaust pressure is greater than or equal to the exhaust pressure threshold. If so, execute S404; if not, continue to execute S405.

[0204] S404 , controlling the bypass branch 19 to be connected.

[0205] When it is determined that the exhaust pressure of the compressor 15 is greater than or equal to the exhaust pressure threshold, the controller 13 controls the opening of the controllable opening solenoid valve, for example, reduces the opening of the controllable opening solenoid valve, and thereby controls the bypass branch 19 to be connected.

[0206] At this time, the amplitude of the frequency reduction of the compressor 15 is controlled according to the degree to which the exhaust pressure is greater than or equal to the exhaust pressure threshold.

[0207] S405 , determining whether the exhaust temperature is greater than or equal to the temperature threshold; if so, executing S406 ; if not, continuing to execute S401 .

[0208] S406 , controlling the bypass branch 19 to be connected.

[0209] When it is determined that the exhaust pressure of the compressor 15 is greater than or equal to the exhaust pressure threshold and the exhaust temperature is greater than or equal to the temperature threshold, the controller 13 controls the opening of the controllable opening solenoid valve, for example, reduces the opening of the controllable opening solenoid valve, and thereby controls the bypass branch 19 to be connected.

[0210] At this time, the degree of frequency reduction of the compressor 15 is controlled according to at least one of the degree to which the exhaust pressure is greater than or equal to the exhaust pressure threshold or the degree to which the exhaust temperature is greater than or equal to the temperature threshold.

[0211] S407: Obtain the suction pressure.

[0212] When it is determined that the air conditioner is in a heating cycle operation, the controller 13 obtains the suction pressure of the compressor 15 through the third sensor 18 .

[0213] S408: Determine whether the inhalation pressure is less than or equal to the inhalation pressure threshold. If so, execute S409; if not, continue to execute S401.

[0214] S409 , controlling the bypass branch 19 to be connected.

[0215] When the air conditioner is in a heating cycle, if it is determined that the suction pressure of the compressor 15 is less than or equal to the suction pressure threshold, the opening of the controllable opening solenoid valve is controlled, for example, the opening of the controllable opening solenoid valve is reduced, thereby controlling the compressor 15 to reduce its frequency.

[0216] At this time, the amplitude of the frequency reduction of the compressor 15 is determined according to the degree to which the suction pressure is less than or equal to the suction pressure threshold.

[0217] Some embodiments of the present disclosure further provide a multi-split system, comprising the aforementioned multiple outdoor units 1 and multiple indoor units 2. This ensures that, in the event that the modular multi-split system fails to operate normally due to an installation problem of an outdoor unit 1 causing the heat exchange air volume of the outdoor heat exchanger 11 to be less than the rated air volume, the operating load allocated to the outdoor unit 1 can also ensure that its system parameters during operation are consistent with those of other unaffected outdoor units 1, thereby improving the rationality of operating load distribution, reducing the possibility of frequency reduction protection of at least one compressor 15 of the multiple outdoor units 1 due to abnormal system parameters of any one of the multiple outdoor units 1, and improving the operating efficiency and reliability of the modular multi-split system.

[0218] In some embodiments, as shown in FIG. 14 , the outdoor unit 1 includes a first sensor 15 and a third sensor 16 .

[0219] In some embodiments, the outdoor unit 1 further includes at least one system pressure acquisition component, which is coupled to the controller 13 and configured to acquire parameters related to the refrigerant pressure of the outdoor unit 1 and transmit the parameters to the controller 13 .

[0220] In some embodiments, the system pressure acquisition component is further configured to acquire the refrigerant pressure of the outdoor unit 1. Here, the refrigerant pressure is, for example, the discharge pressure or suction pressure of the compressor 15. In some embodiments, the controller 13 can receive the refrigerant pressure via the system pressure acquisition component and can also obtain the refrigerant pressure by processing relevant parameters of the refrigerant pressure received by the controller 13.

[0221] In some embodiments, the parameter related to the refrigerant pressure may be the condensing temperature of the outdoor heat exchanger 11. In this case, as shown in FIG15 , the second sensor may include a first sub-sensor 17 (e.g., a first temperature detection element), which is coupled to the controller 13. The first sub-sensor 17 is disposed on the outdoor heat exchanger 11 and is configured to detect the condensing temperature of the outdoor heat exchanger 11 when the air conditioner is operating in a cooling cycle or a heating cycle.

[0222] In some embodiments, the controller 13 obtains the high pressure according to the relationship between the condensation temperature and the high pressure. Here, the high pressure may be the exhaust pressure.

[0223] In some embodiments, the parameter related to the refrigerant pressure may be the evaporation temperature of the outdoor heat exchanger 11. In this case, as shown in FIG15 , the second sensor may further include a second sub-sensor 18 (e.g., a second temperature detection element), which is coupled to the controller 13. The second sub-sensor 18 is disposed on the outdoor heat exchanger 11 and is configured to detect the evaporation temperature of the outdoor heat exchanger 11 when the air conditioner is operating in a cooling cycle or a heating cycle.

[0224] In some embodiments, the controller 13 obtains the low pressure according to the relationship between the evaporation temperature and the low pressure. Here, the low pressure may be the suction pressure.

[0225] In some embodiments, as shown in FIG. 16 , the controller 13 is further configured to execute S10 to S14 .

[0226] S10: Obtain load requirements of multiple indoor units 2, and obtain a total load requirement based on the multiple load requirements.

[0227] The controller 13 of the host obtains the load requirements of multiple indoor units 2 that are in communication with the host, and obtains a total load requirement based on the load requirements of the multiple indoor units 2. For example, the total load requirement is the sum of the load requirements of the multiple indoor units 2.

[0228] S11 , allocating the total load demand to multiple outdoor units 1 .

[0229] The controller 13 of the master distributes the total load demand to the plurality of outdoor units 1 (eg, at least one slave unit and the master) to control the operations of the plurality of outdoor units 1 .

[0230] S12: Obtain the refrigerant pressures of the multiple outdoor units 1.

[0231] After distributing the total load demand to the plurality of outdoor units 1 and controlling the operation of the plurality of outdoor units 1 , the controller 13 of the host circulates and obtains the refrigerant pressures corresponding to the plurality of outdoor units 1 .

[0232] Here, obtaining the refrigerant pressures corresponding to the plurality of outdoor units 1 once may constitute one cycle.

[0233] S13. Determine whether the refrigerant pressures of the multiple outdoor units 1 are equal. If so, continue to execute S12; if not, execute S14.

[0234] S14 : Correct the operating loads of the plurality of outdoor units 1 according to the refrigerant pressures of the plurality of outdoor units 1 .

[0235] In the event that the refrigerant pressures of the multiple outdoor units 1 are unequal, the controller 13 of the main unit corrects the operating loads of the multiple outdoor units 1 based on the refrigerant pressures of the multiple outdoor units 1, so that the refrigerant pressures of the multiple outdoor units 1 are at the same level. For example, the controller 13 cyclically corrects the operating loads of the multiple outdoor units 1 based on the refrigerant pressures of the multiple outdoor units 1 obtained in each cycle until the refrigerant pressures of the outdoor units 1 are at the same level, thereby distributing the operating loads of the multiple outdoor units 1 according to their capacities, and achieving a state of balanced operating load distribution among the multiple outdoor units 1 of the air conditioner.

[0236] In some embodiments, the refrigerant pressures corresponding to the multiple outdoor units 1 are at the same level, which means that the multiple refrigerant pressures are approximately equal.

[0237] In other embodiments, when the difference between the maximum and minimum refrigerant pressures corresponding to multiple outdoor units 1 is within the same level threshold range, it can be determined that the refrigerant pressures of multiple outdoor units 1 are at the same level, that is, it can be confirmed that the air conditioner distributes the operating load of multiple outdoor units 1 evenly.

[0238] The outdoor unit 1 in some embodiments of the present disclosure performs cyclic correction on the operating loads of the multiple outdoor units 1 according to the refrigerant pressures of the multiple outdoor units 1, so that the refrigerant pressures of the multiple outdoor units 1 can be at the same level, that is, the operating loads can be distributed according to the capabilities of the multiple outdoor units 1, and the refrigerant pressures of the multiple outdoor units 1 can be detected when the multiple outdoor units 1 are operating to ensure that the refrigerant pressures of the multiple outdoor units 1 are at the same level. In this way, when the multiple outdoor units 1 are operating, even if they are affected by the actual operating environment (such as outdoor ambient temperature, heat dissipation air volume, and heat exchange area), the operating load distribution of the multiple outdoor units 1 is still balanced, thereby solving the problem of unbalanced operating load distribution of the modular multi-split air conditioner and increasing the reliability of the operation of the outdoor unit 1.

[0239] In some embodiments, as shown in FIG. 17 , the controller 13 is further configured to execute S20 to S28 .

[0240] S20: Obtain load requirements of multiple indoor units 2.

[0241] S21 . Obtain the displacements of the multiple compressors 15 , and compare the displacements of the multiple compressors 15 .

[0242] S22: Determine whether the displacements of the multiple compressors 15 are equal. If so, execute S23; if not, execute S25.

[0243] S23 , obtaining a total load demand based on the load demands of the plurality of indoor units 2 and the displacement of the compressor 15 .

[0244] When the displacements of the plurality of compressors 15 are equal, the controller 13 of the host unit obtains the total load demand under the displacements according to the load demands of the plurality of indoor units 2 .

[0245] S24 : The total load demand is evenly distributed to the multiple compressors 15 to obtain the operating load of any outdoor unit 1 .

[0246] When the displacements of the compressors 15 are equal, the initial operating loads of the compressors 15 may be an average value of the total load demand and the number of compressors 15 , that is, the total load demand is evenly distributed to the compressors 15 , and the compressors 15 initially operate at the average operating load.

[0247] At this time, the operating load of the outdoor unit 1 including the plurality of compressors 15 is equal to the sum of the operating loads of the plurality of compressors 15 .

[0248] S25. Set a reference displacement and calculate displacement coefficients corresponding to the plurality of compressors.

[0249] In a case where the displacements of the plurality of compressors 15 are not equal, a reference displacement is set, and displacement coefficients of the displacements of the plurality of compressors 15 relative to the reference displacement are obtained.

[0250] For example, the ratio of the displacements corresponding to the plurality of compressors 15 to the reference displacement is the displacement coefficient corresponding to the plurality of compressors 15 .

[0251] S26. Obtain a total load demand according to the load demands of the plurality of indoor units 2 and the reference displacement.

[0252] That is, when the displacements of the plurality of compressors 15 are not equal, the controller 13 obtains the total load demand at the reference displacement.

[0253] S27 . Calculate an average load value based on the total load demand and the displacement coefficients of the multiple compressors 15 .

[0254] In some embodiments, the ratio of the total load demand to the sum of the displacement coefficients of the plurality of compressors 15 is the load average.

[0255] S28. Calculate the operating load based on the load average value and the displacement coefficients of the multiple compressors 15.

[0256] It should be noted that the operating load corresponding to each of the multiple compressors 15 is equal to the product of the average load and the displacement coefficient of the corresponding compressor 15. In other words, the initial operating load of any one of the multiple compressors 15 is equal to the product of the ratio of its displacement coefficient to the displacement coefficients of the multiple compressors 15 and the total load demand.

[0257] In some embodiments, as shown in Figure 12, the outdoor unit 1 further includes a fan. The controller 13 of the outdoor unit 1 also stores fan parameters.

[0258] In some embodiments, as shown in FIG. 18 , the controller 13 is further configured to execute S30 to S32 .

[0259] S30 : Obtain upper load limits of multiple outdoor units 1 according to fan parameters.

[0260] The controller 13 obtains the upper limit value of the load of the outdoor unit 1 according to the fan parameters. For example, the upper limit value of the load of the outdoor unit 1 is the upper limit value of the operating frequency of the compressor 15 included in the outdoor unit 1 .

[0261] S31. Obtain load requirements of multiple indoor units 2, and obtain a total load requirement based on the load requirements.

[0262] For example, the total load demand is the sum of the load demands of multiple indoor units 2 .

[0263] S32 , calculating the operating loads of the multiple outdoor units according to the load upper limits and the total load demand of the multiple outdoor units 1 .

[0264] For example, the initial operating load of any outdoor unit 1 among the multiple outdoor units 1 is equal to the product of the ratio of the load upper limit value of the corresponding outdoor unit to the sum of the load upper limits of the multiple outdoor units 1 and the total load demand.

[0265] It should be noted that, when the displacements of the multiple compressors 15 are equal, the operating load of the outdoor unit 1 including the multiple compressors 15 is evenly distributed among the multiple compressors 15; when the displacements of the compressors 15 are unequal, the operating load of the outdoor unit 1 including the multiple compressors 15 can be distributed according to the ratio of the displacements corresponding to the multiple compressors 15 to the total displacement of the outdoor unit 1.

[0266] In some embodiments, as shown in FIG. 19 , the controller 13 of the host is further configured to execute S60 to S69 .

[0267] S60. Configure the load correction factor.

[0268] In some embodiments, the controller 13 further stores a load correction coefficient to adjust the magnitude of the operating load of each operating load correction cycle of the outdoor unit 1 .

[0269] S61. Acquire multiple compressor displacements and compare the multiple compressor displacements.

[0270] S62: Determine whether the displacements of the multiple compressors are equal. If so, execute S63; if not, execute S66.

[0271] S63: Obtain the refrigerant pressures of multiple outdoor units 1 and calculate the average refrigerant pressure.

[0272] Here, the average refrigerant pressure value is the ratio of the sum of the refrigerant pressures of the plurality of outdoor units 1 to the number of the outdoor units 1 .

[0273] S64. Calculate a pressure deviation coefficient based on the refrigerant pressure and the average refrigerant pressure.

[0274] The controller 13 of the host calculates the difference between the refrigerant pressure and the average refrigerant pressure.

[0275] The pressure deviation coefficient of any outdoor unit 1 among the multiple outdoor units 1 may be a ratio of a difference between the refrigerant pressure of the outdoor unit 1 and an average refrigerant pressure to the average refrigerant pressure.

[0276] S65: Calculate the corrected operating load of the outdoor unit 1 based on the load correction coefficient, the pressure deviation coefficient, and the operating load.

[0277] The controller 13 of the host machine corrects the operating loads of the plurality of outdoor units 1 using the load correction coefficient and the refrigerant pressure. For example, the load correction coefficient can be adjusted in each cycle to correct the magnitude of the operating loads of the plurality of outdoor units 1.

[0278] The corrected operating load of any one of the plurality of outdoor units 1 is equal to the sum of the product of the load correction coefficient and the pressure deviation coefficient and the operating load of the outdoor unit 1 .

[0279] In some embodiments, it is assumed that the air conditioner includes i outdoor units 1, and the refrigerant pressures of the i outdoor units 1 are defined as P1, P2...Pi respectively.

[0280] At this time, the average refrigerant pressure Pav of the outdoor unit 1 is equal to (P1+P2+…+Pi) / i, and the difference between the refrigerant pressure and the average refrigerant pressure ΔPi is equal to Pi-Pav; the pressure deviation coefficient Kpi is equal to ΔPi / Pav.

[0281] The corrected operating load value Fn=Fn-1+K×Kpi, where K is a load correction factor and the unit of K may be the unit of the operating load, such as Hertz.

[0282] S66: Set a reference displacement and calculate displacement coefficients corresponding to the plurality of compressors.

[0283] In the case where the displacements of the plurality of compressors 15 are not equal, a reference displacement is set, and a displacement coefficient of the displacement of the corresponding compressor 15 relative to the reference displacement is obtained.

[0284] For example, a ratio of the displacement corresponding to each of the plurality of compressors 15 to the reference displacement is a displacement coefficient of the corresponding compressor 15 .

[0285] S67: Obtain the refrigerant pressures of multiple outdoor units 1 and calculate the average refrigerant pressure.

[0286] S68. Calculate a pressure deviation coefficient based on the refrigerant pressure and the average refrigerant pressure.

[0287] S69 , calculating a correction value of the operating load of the compressor according to the load correction coefficient, the pressure deviation coefficient, the displacement coefficient, and the operating load of the compressor 15 .

[0288] In some embodiments, the correction value of the operating load of any compressor 15 among the multiple compressors 15 is equal to the sum of the ratio of the product of the load correction coefficient and the pressure deviation coefficient and the displacement coefficient of the compressor 15 and the operating load of the compressor 15.

[0289] In some embodiments, it is assumed that the air conditioner includes i compressors 15 , and the refrigerant pressures of the i compressors 15 are defined as P1 , P2 . . . Pi respectively.

[0290] At this time, the average refrigerant pressure Pav of the compressor 15 is (P1+P2+…+Pi) / i, the difference between the refrigerant pressure and the average refrigerant pressure ΔPi is Pi-Pav, and the pressure deviation coefficient Kpi is ΔPi / Pav.

[0291] The displacements of the i compressors 15 are defined as C1, C2, ..., Ci; the base displacement is C0. The displacement coefficient is Ki = Ci / C0; the corrected operating load value Fn = Fn-1 + K × Kpi / Ki;

[0292] Here, K is the load correction factor, and the unit of K can be the unit of the operating load, such as Hertz.

[0293] In some embodiments, as shown in FIG. 20 , the controller 13 is further configured to execute S70 to S72 .

[0294] S70: Determine whether the air conditioner is in refrigeration cycle operation. If so, execute S71; if not, execute S72.

[0295] S71. The refrigerant pressure is the exhaust pressure, and the load correction factor is a positive value.

[0296] When the air conditioner is in refrigeration cycle operation, the refrigerant pressure acquired by the controller 13 is the exhaust pressure of the compressor 15 , and the load correction coefficient is a positive value.

[0297] S72. The refrigerant pressure is the suction pressure and the load correction factor is a negative value.

[0298] When the air conditioner is performing a non-refrigeration cycle operation (eg, a heating cycle), the refrigerant pressure acquired by the controller 13 is the suction pressure of the compressor 15 , and the load correction coefficient is a negative value.

[0299] Some embodiments of the present disclosure further provide a multi-split system, comprising a plurality of communicatively connected indoor units 2 and a plurality of communicatively connected outdoor units 1, wherein the indoor units 2 are communicatively connected to the outdoor units 1. The plurality of outdoor units 1 include a master unit and at least one slave unit. The outdoor unit 1 is an outdoor unit in a modular multi-split air conditioner, and the outdoor unit can be configured as either a master unit or a slave unit.

[0300] In some embodiments, the outdoor unit 1 includes at least one system pressure acquisition component, which is configured to acquire parameters related to the refrigerant pressure of the outdoor unit 1 .

[0301] The outdoor unit 1 further includes a controller 13 coupled to a system pressure acquisition component. The system pressure acquisition component transmits parameters related to the refrigerant pressure to the controller 13, allowing the controller 13 to obtain the refrigerant pressure of the outdoor unit 1. Here, the refrigerant pressure is the discharge pressure or suction pressure of the compressor 15. In some embodiments, the controller 13 may receive the refrigerant pressure via the system pressure acquisition component and may also obtain the refrigerant pressure by processing the parameters related to the refrigerant pressure received by the controller 13.

[0302] The controller 13 of the host obtains the load demand of the corresponding indoor unit 2 and the refrigerant pressure of multiple outdoor units 1 (for example, the host and at least one slave) connected to it, and obtains the total load demand based on the load demand, and distributes the total load demand to multiple outdoor units 1 to control the operation of multiple outdoor units 1.

[0303] The controller 13 of the host device further corrects the operating loads of the plurality of outdoor units 1 according to the refrigerant pressures of the plurality of outdoor units 1 so that the refrigerant pressures of the plurality of outdoor units 1 are at the same level.

[0304] That is, after the host controller 13 distributes the total load demand to multiple outdoor units 1 and controls the multiple outdoor units 1 to operate S2, it cyclically obtains the refrigerant pressures of the multiple outdoor units 1 and cyclically corrects the operating loads of the multiple outdoor units 1 according to the refrigerant pressures obtained each time until the refrigerant pressures of the multiple outdoor units 1 are at the same level, so that the load is distributed according to the capacity of the multiple outdoor units 1 and reaches a balanced state.

[0305] The equivalent levels here are similar to those in the above embodiment and will not be described again.

[0306] It should be noted that any one of the technical solutions disclosed in the present disclosure can solve one or more of the above-mentioned technical problems and achieve certain invention purposes to a certain extent; multiple technical disclosures can also be combined into an overall solution to solve one or more of the above-mentioned technical problems and achieve certain invention purposes; some of the technical disclosures can also be selected to combine into an overall solution, while adopting related technologies and deteriorated solutions, but the deterioration trend can be compensated by the means disclosed in this technology, and the above-mentioned one or more technical problems can be solved to a certain extent as a whole and certain invention purposes can be achieved; each technical disclosure combined into a complete technical solution constitutes an organic and inseparable overall solution, which solves technical problems as a whole and achieves certain invention purposes.

[0307] Any technical disclosure in this disclosure, as well as the recombination of multiple technical disclosures, can form a complete technical solution and can solve one or more of the above-mentioned technical problems and achieve the purpose of the invention. They all belong to the content of this disclosure and are the content that is directly and unambiguously determined based on the content of this disclosure.

[0308] Those skilled in the art will understand that the scope of the present invention is not limited to the above specific embodiments, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the present application. The scope of the present application is limited by the appended claims.

Claims

1. An air conditioner, comprising: Multiple indoor units communicate with each other; a plurality of outdoor units, communicatively connected to each other and to the plurality of indoor units; The plurality of outdoor units include: Host; and at least one slave, the at least one slave being communicatively connected to the master; Any one of the plurality of outdoor units comprises: outdoor heat exchanger; Air volume coefficient acquisition component; and A controller is coupled to the air volume coefficient acquisition component; the controller stores the load upper limit values of the plurality of outdoor units and the configuration parameters of the outdoor heat exchanger, and the controller is configured to: receiving the air volume coefficient of the outdoor heat exchanger obtained by the air volume coefficient obtaining component, and obtaining a heat exchange capacity coefficient of the outdoor heat exchanger according to the configuration parameters and the air volume coefficient; Obtaining the load demand of any one of the indoor units, the load upper limit value of the at least one slave unit, and the heat exchange capacity coefficient; Obtaining an operating load of any one of the outdoor units according to the load demand, the load upper limit, and the heat exchange capacity coefficient; The air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger affected by the air volume.

2. The air conditioner according to claim 1, wherein The plurality of outdoor units further include at least one compressor coupled to the controller; the at least one compressor corresponds to the same or different upper frequency limits; The load upper limit value stored in the controller includes a frequency upper limit value corresponding to the at least one compressor; The operating load of any one of the outdoor units includes the operating frequency of the corresponding compressor.

3. The air conditioner according to claim 2, wherein: The configuration parameter is the heat exchange area of the outdoor heat exchanger; the controller also stores the compressor power; The controller is further configured to calculate the heat exchange capacity coefficient according to the air volume coefficient, the heat exchange area and the compressor power.

4. The air conditioner according to claim 2 or 3, wherein: Any one of the outdoor units further includes a pressure sensor, which is disposed on the outdoor heat exchanger and coupled to the controller; The controller is further configured to: obtain an operating static pressure value of the outdoor heat exchanger detected by the pressure sensor, and obtain the air volume coefficient according to a static pressure value corresponding to a set wind speed and the operating static pressure value.

5. The air conditioner according to any one of claims 2 to 4, wherein: The controller stores at least one compressor displacement; The controller of the host is configured to: obtaining the displacement of the at least one compressor; If it is determined that the displacement of the at least one compressor is equal, obtaining a total operating frequency requirement according to the load requirement; Calculating frequency allocation coefficients of the plurality of outdoor units according to the load upper limit value and the heat exchange capacity coefficient; The operating load is calculated according to the frequency allocation coefficient and the total operating frequency demand.

6. The air conditioner according to any one of claims 2 to 5, wherein: The controller stores at least one compressor displacement; The controller of the host is configured to: obtaining the displacement of the at least one compressor; If it is determined that the displacement of the at least one compressor is unequal, setting a reference displacement; Obtaining a total operating frequency requirement under the reference displacement according to the load requirement; According to the reference displacement and the displacement of the at least one compressor, the displacement of the at least one compressor relative to the reference displacement is obtained. The displacement coefficient; Calculating a frequency allocation coefficient of the compressor according to the displacement coefficient, the frequency upper limit value of the at least one compressor, and the heat exchange capacity coefficient; The operating load is calculated according to a frequency allocation coefficient of the at least one compressor, the total operating frequency requirement, and the displacement coefficient.

7. The air conditioner according to any one of claims 2 to 6, wherein: The plurality of outdoor units further include: A bypass branch, wherein both ends of the bypass branch are respectively connected to the exhaust port and the intake port of the corresponding compressor; the bypass branch is coupled to the controller, and the controller controls the connection or cutoff of the bypass branch; At least one of a first sensor or a second sensor; the first sensor and the second sensor are respectively coupled to the controller and disposed at the exhaust port; a third sensor coupled to the controller and disposed at the suction port; the third sensor being configured to detect suction pressures of the plurality of compressors; The controller stores an exhaust pressure threshold, an intake pressure threshold, and a temperature threshold; The controller is further configured to: If it is determined that the air conditioner is in refrigeration cycle operation, obtaining the exhaust pressure of the at least one compressor detected by the first sensor and the exhaust temperature of the at least one compressor detected by the second sensor; If at least one of the following conditions is met, the bypass branch is controlled to be connected or the multiple compressors are controlled to reduce their frequencies: The exhaust pressure is greater than or equal to the exhaust pressure threshold; or The exhaust temperature is greater than or equal to a temperature threshold.

8. The air conditioner according to claim 7, wherein: The controller is further configured to: If it is determined that the air conditioner is in a heating cycle operation, obtaining the suction pressure; If it is determined that the suction pressure is less than or equal to the suction pressure threshold, the bypass branch is controlled to be connected or the multiple compressors are controlled to reduce the frequency.

9. An air conditioner comprising: Multiple indoor units communicate with each other; a plurality of outdoor units, communicatively connected to each other and to the plurality of indoor units; The plurality of outdoor units include: Host; and at least one slave, the at least one slave being communicatively connected to the master; Any one of the plurality of outdoor units comprises: System pressure acquisition components; and A controller is coupled to the system pressure acquisition component, and the controller is configured to: obtaining the refrigerant pressure according to the relevant parameters of the refrigerant pressure of the outdoor unit received by the outdoor unit and obtained by the system pressure obtaining component; Obtaining load requirements of the plurality of indoor units, and obtaining a total load requirement based on the load requirements; distributing the total load demand to the plurality of outdoor units; Obtaining refrigerant pressures of the plurality of outdoor units, and correcting operating loads of the plurality of outdoor units according to the refrigerant pressures so that the refrigerant pressures of the plurality of outdoor units are at the same level; wherein the refrigerant pressures being at the same level satisfies one of the following conditions: The refrigerant pressures of the plurality of outdoor units are equal; and The differences between the maximum and minimum values of the refrigerant pressures corresponding to the plurality of outdoor units are within the same level threshold range.

10. The air conditioner according to claim 9, wherein The controller stores a load correction coefficient, and the controller adjusts the amplitude of the operating load of the plurality of outdoor units according to the load correction coefficient; The controller is configured to correct the operating load using the load correction coefficient and the refrigerant pressure.

11. The air conditioner according to claim 10, wherein The outdoor unit further includes at least one compressor coupled to the controller; The controller is further configured to, when acting as the host: obtaining a compressor displacement of the at least one compressor; If it is determined that the displacement of the at least one compressor is equal, obtaining the total load demand according to the load demand and the displacement; Obtaining the refrigerant pressures of the plurality of outdoor units and calculating an average refrigerant pressure value; Calculating a pressure deviation coefficient based on the refrigerant pressure and the average refrigerant pressure; Corrected operating loads of the plurality of outdoor units are calculated based on the load correction coefficient, the pressure deviation coefficient, and the operating load.

12. The air conditioner according to claim 11, wherein The controller is further configured to: If it is determined that the compressor displacements are not equal, a reference displacement is set, and displacement coefficients corresponding to the plurality of compressors are calculated; Obtaining the refrigerant pressures of the plurality of compressors and calculating an average refrigerant pressure; Calculating a pressure deviation coefficient based on the refrigerant pressure and the average refrigerant pressure; Correction values of the operating loads of the plurality of compressors are obtained according to the load correction coefficient, the pressure deviation coefficient, the displacement coefficient, and the operating loads of the plurality of compressors.

13. The air conditioner according to any one of claims 9 to 12, wherein: Any one of the plurality of outdoor units further comprises: a first sub-sensor coupled to the controller and disposed on the outdoor heat exchanger; the first sub-sensor detecting a condensing temperature of the outdoor heat exchanger when the air conditioner is in a cooling cycle operation or a heating cycle operation; a second sub-sensor coupled to the controller and disposed on the outdoor heat exchanger; the second sub-sensor detecting an evaporation temperature of the outdoor heat exchanger when the air conditioner is in a cooling cycle operation or a heating cycle operation; The controller is further configured to: obtaining the exhaust pressure according to the relationship between the condensing temperature and the exhaust pressure of the compressor; The suction pressure is obtained according to the relationship between the evaporation temperature and the suction pressure of the compressor.

14. The air conditioner according to claim 13, wherein The controller is further configured to: If it is determined that the air conditioner is in refrigeration cycle operation, the refrigerant pressure is set to the exhaust pressure and the load correction coefficient is a positive value; If it is determined that the air conditioner is in a heating cycle operation, the refrigerant pressure is set to the suction pressure, and the load correction coefficient is a negative value.

15. The air conditioner according to claim 13 or 14, wherein: The controller is further configured to: If it is determined that the displacements of the plurality of compressors are equal, the total load demand is evenly distributed to the plurality of compressors; If it is determined that the displacements of the plurality of compressors are not equal, the operating loads of the plurality of compressors are obtained according to the total load demand and the corresponding displacement coefficients.

16. A multi-connection system comprising: Multiple indoor units communicate with each other; a plurality of outdoor units, communicatively connected to each other and to the plurality of indoor units; The plurality of outdoor units include: Host; and at least one slave, the at least one slave being communicatively connected to the master; Any one of the plurality of outdoor units comprises: outdoor heat exchanger; Air volume coefficient acquisition component; and A controller is coupled to the air volume coefficient acquisition component; the controller stores the load upper limit values of the plurality of outdoor units and the configuration parameters of the outdoor heat exchanger, and the controller is configured to: Receive the air volume coefficient of the outdoor heat exchanger obtained by the air volume coefficient acquisition component, and The air volume coefficient obtains the heat transfer capacity coefficient of the outdoor heat exchanger; Obtaining the load demand of any one of the indoor units, the load upper limit value of the at least one slave unit, and the heat exchange capacity coefficient; Obtaining an operating load of any one of the outdoor units according to the load demand, the load upper limit, and the heat exchange capacity coefficient; The air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger affected by the air volume; The load upper limit value stored in the controller includes the frequency upper limit values corresponding to the plurality of compressors; The operating loads of the plurality of outdoor units include operating frequencies of the plurality of compressors.

17. The multi-connection system according to claim 16, wherein: The configuration parameter is the heat exchange area of the outdoor heat exchanger; the controller also stores the compressor power; The controller is further configured to obtain the heat exchange capacity coefficient according to the air volume coefficient, the heat exchange area and the compressor power.

18. The multi-connection system according to claim 16 or 17, wherein: Any one of the plurality of outdoor units further comprises: a system pressure acquisition component coupled to the controller; A controller is coupled to the system pressure acquisition component, and the controller is configured to: Obtaining refrigerant pressure according to the relevant parameters of the refrigerant pressure received by the outdoor unit and obtained by the system pressure obtaining component; Obtaining load requirements of the plurality of indoor units, and obtaining a total load requirement based on the load requirements; distributing the total load demand to the plurality of outdoor units; Refrigerant pressures of the plurality of outdoor units are obtained, and operating loads of the plurality of outdoor units are corrected based on the refrigerant pressures so that the refrigerant pressures of the plurality of outdoor units are at the same level.

19. The multi-connection system according to claim 18, wherein: The controller stores a load correction coefficient, and the controller adjusts the amplitude of the operating load of the plurality of outdoor units according to the load correction coefficient; The controller is configured to correct the operating load using the load correction coefficient and the refrigerant pressure.

20. The multi-connection system according to claim 19, wherein: The outdoor unit further includes at least one compressor coupled to the controller; The controller is further configured to, when acting as the host: obtaining a compressor displacement of the at least one compressor; If it is determined that the displacement of the at least one compressor is equal, obtaining the total load demand according to the load demand and the displacement; Obtaining the refrigerant pressures of the plurality of outdoor units and calculating an average refrigerant pressure value; Calculating a pressure deviation coefficient based on the refrigerant pressure and the average refrigerant pressure; Corrected operating loads of the plurality of outdoor units are calculated based on the load correction coefficient, the pressure deviation coefficient, and the operating load.

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