Multi-connected air conditioning system and control method thereof

Abstract

This application provides a multi-split air conditioning system and its control method, relating to the field of air conditioning technology, for controlling the multi-split air conditioning system to operate in a high sensible heat mode to reduce energy consumption. The multi-split air conditioning system includes: an outdoor unit; at least one indoor unit; at least one first temperature sensor; at least one humidity sensor; and a controller configured to: acquire the return air temperature of each indoor unit through the at least one first temperature sensor, and acquire the ambient humidity of each indoor unit through the at least one humidity sensor; determine the return air temperature difference and humidity difference values ​​of each indoor unit respectively; if the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then control the outdoor unit to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system is higher in the high sensible heat mode than in other operating modes.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a multi-split air conditioning system and its control method. Background Technology

[0002] Currently, multi-split air conditioners are widely used in commercial and residential applications. Compared with ordinary air conditioning systems, multi-split air conditioners have advantages such as energy saving, low operating costs, advanced control, reliable operation, good unit adaptability, and a wide range of cooling and heating temperatures.

[0003] Existing multi-split air conditioning systems typically control the heat-to-humidity ratio by treating heat and humidity in a unified manner. Cooling and dehumidification share the same low-temperature cold source, which does not allow for full utilization of energy, resulting in high energy consumption for the air conditioning system. Summary of the Invention

[0004] This application provides a multi-split air conditioning system and its control method, which is used to control the multi-split air conditioning system to operate in a high sensible heat mode to reduce energy consumption.

[0005] To achieve the above objectives, this application adopts the following technical solution.

[0006] In a first aspect, embodiments of this application provide a multi-split air conditioning system and a control method thereof, relating to the field of air conditioning technology, for controlling the multi-split air conditioning system to operate in a high sensible heat mode to reduce energy consumption. The multi-split air conditioning system includes: an outdoor unit; at least one indoor unit, each indoor unit being connected to the outdoor unit via refrigerant connection pipes; at least one first temperature sensor for detecting the return air temperature of each indoor unit; at least one humidity sensor for detecting the ambient humidity of each indoor unit; and a controller configured to: acquire the return air temperature of each indoor unit via the at least one first temperature sensor, and acquire the ambient humidity of each indoor unit via the at least one humidity sensor; determine the return air temperature difference and humidity difference of each indoor unit, wherein, for one indoor unit, the return air temperature difference is the difference between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference is the difference between the ambient humidity of the indoor unit and the set humidity of the indoor unit; if the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then the outdoor unit is controlled to operate in a high sensible heat mode, wherein, in the high sensible heat mode, the sensible heat ratio of the multi-split air conditioning system is higher than in other operating modes.

[0007] The technical solution provided in this application offers at least the following beneficial effects: It provides an operating mode for a multi-split air conditioning system, namely a high sensible heat mode, where the sensible heat ratio is higher than in other modes. Furthermore, this application determines whether the conditions for operating the high sensible heat mode are met based on the actual temperature and humidity, i.e., set temperature and humidity thresholds. When the conditions for operating the high sensible heat mode are met, it indicates that the indoor temperature and humidity are suitable, thus allowing for control of the high sensible heat mode operation to reduce the energy consumed in regulating indoor temperature and humidity, thereby achieving energy conservation.

[0008] In some embodiments, the controller is further configured to: control the outdoor unit of the air conditioner to stop operating in high sensible heat mode if the maximum return air temperature difference is greater than or equal to a temperature threshold, and / or the maximum humidity difference is greater than or equal to a humidity threshold.

[0009] In some embodiments, the controller is specifically configured to: determine the target level parameter of the high sensible heat mode based on the maximum return air temperature difference; and control the outdoor unit to operate at the target high sensible heat level corresponding to the target level parameter according to a preset correspondence and the level parameter, wherein the preset correspondence is used to indicate the correspondence between at least one level parameter and at least one high sensible heat level.

[0010] In some embodiments, the controller is further configured to: determine an evaporation temperature correction value based on the maximum return air temperature difference and the target return air temperature difference value corresponding to the target high sensible heat rating; determine a target evaporation temperature based on the preset evaporation temperature and the evaporation temperature correction value during the operation of the multi-split air conditioning system; and adjust the operating frequency of the compressor of the multi-split air conditioning system based on the target evaporation temperature.

[0011] In some embodiments, the controller is specifically configured to: increase the operating frequency of the compressor if the actual evaporation temperature is greater than the target evaporation temperature; keep the operating frequency of the compressor unchanged if the actual evaporation temperature is equal to the target evaporation temperature; and decrease the operating frequency of the compressor if the actual evaporation temperature is less than the target evaporation temperature.

[0012] In some embodiments, the controller is specifically controlled to: determine the difference between the target return air temperature difference and the maximum return air temperature difference, and determine an evaporation temperature correction value based on the difference between the target return air temperature difference and the maximum return air temperature difference.

[0013] In some embodiments, the controller is further configured to adjust the operating frequency of the compressor of the multi-split air conditioning system according to the target outlet air temperature corresponding to the target high sensible heat rating.

[0014] In some embodiments, the controller is specifically controlled to: control the actual air outlet temperature of the indoor unit corresponding to the maximum return air temperature value of the third temperature sensor; if the actual air outlet temperature is less than the target air outlet temperature, reduce the operating frequency of the compressor; if the actual air outlet temperature is greater than or equal to the target air outlet temperature, control the operating frequency of the compressor to remain unchanged.

[0015] Secondly, embodiments of this application provide a control method for a multi-split air conditioning system. The method includes: acquiring the return air temperature of each indoor unit through at least one first temperature sensor, and acquiring the ambient humidity of each indoor unit through at least one humidity sensor; determining the return air temperature difference and humidity difference of each indoor unit, wherein, for one indoor unit, the return air temperature difference is the difference between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference is the difference between the ambient humidity of the indoor unit and the set humidity of the indoor unit; if the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then controlling the outdoor unit to operate in a high sensible heat mode, wherein, in the high sensible heat mode, the sensible heat ratio of the multi-split air conditioning system is higher than in other operating modes.

[0016] Thirdly, embodiments of this application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes any of the control methods for multi-split air conditioning systems provided in the second aspect.

[0017] Fourthly, embodiments of this application provide a computer-readable storage medium including computer instructions that, when executed on a computer, cause the computer to perform any of the control methods for a multi-split air conditioning system provided in the second aspect.

[0018] Fifthly, embodiments of the present invention provide a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize any of the control methods for multi-split air conditioning systems provided in the second aspect.

[0019] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor, or it may be packaged separately from the controller's processor; this application does not impose any limitations on this.

[0020] The detailed descriptions of the second to fifth aspects and their various embodiments in this application can be found in the detailed descriptions of the first aspect and its various embodiments; and the beneficial effects of the second to fifth aspects and their various implementations can be found in the beneficial effect analysis of the first aspect and its various embodiments, which will not be repeated here. Attached Figure Description

[0021] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0022] Figure 1 This application provides a schematic diagram of the composition of a multi-split air conditioning system.

[0023] Figure 2 This application provides a schematic diagram of the structure of a multi-split air conditioning system as an embodiment of the present application.

[0024] Figure 3 A schematic diagram of the structure of an outdoor unit provided for an embodiment of this application;

[0025] Figure 4 A hardware configuration block diagram of a multi-split air conditioning system provided in this application embodiment;

[0026] Figure 5 A flowchart of a control method for a multi-split air conditioning system provided in this application embodiment;

[0027] Figure 6 A flowchart illustrating another control method for a multi-split air conditioning system provided in this application embodiment;

[0028] Figure 7 This is a hardware configuration block diagram of a controller for a multi-split air conditioning system provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0033] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0034] To facilitate understanding, we will first provide a brief introduction and explanation of some terms or basic concepts of technology involved in the embodiments of the present invention.

[0035] Cooling mode: The air conditioning system's compressor draws the low-temperature, low-pressure gaseous refrigerant, which has been evaporated in the evaporator, into the compressor chamber, compressing it into a high-temperature, high-pressure gaseous refrigerant, which then enters the condenser. In the condenser, the high-temperature, high-pressure gaseous refrigerant condenses into a high-temperature, high-pressure liquid refrigerant. After passing through a throttling element such as a capillary tube, it becomes a low-temperature, low-pressure liquid refrigerant, which then evaporates in the evaporator and finally returns to the compressor, completing the entire refrigeration cycle. In cooling mode, the outdoor heat exchanger functions as the condenser, and the indoor heat exchanger functions as the evaporator.

[0036] Refrigerant: A substance that easily absorbs heat and turns into a gas, and easily releases heat and turns into a liquid. In air conditioning systems, heat energy is transferred through the evaporation and condensation of refrigerant to produce a cooling effect.

[0037] Dehumidification mode: The heat exchanger of the indoor unit of the air conditioning system absorbs heat as an evaporator. The indoor air will pass through the evaporator, be condensed into water and left in the air conditioner. Then, the water vapor will be discharged through the air conditioner's drain pipe, thereby achieving the effect of drying the indoor air.

[0038] Sensible heat ratio: The sensible heat ratio refers to the ratio of sensible load to total load. The total load of an air conditioning system during operation consists of sensible load and latent load. Sensible load refers to the energy consumed by the air conditioning system per unit time to lower the indoor temperature, while latent load refers to the energy consumed by the air conditioning system per unit time to lower the indoor humidity. A higher sensible heat ratio results in a more significant cooling effect and higher operating efficiency of the air conditioning system.

[0039] In related technologies, multi-split air conditioning systems typically cool and dehumidify the air using surface coolers. Because this system employs a unified temperature and humidity control method, its energy consumption is high. Furthermore, this method struggles to adapt to changes in the heat-to-moisture ratio, resulting in poor indoor air quality and low user comfort. In contrast, air conditioning systems with independent temperature and humidity control systems address these two parameters using separate processing methods. This requires significant water resources and extensive supporting infrastructure, leading to higher investment and operating costs.

[0040] Based on this, this application provides a multi-split air conditioning system. The system includes: an outdoor unit; at least one indoor unit, each indoor unit being connected to the outdoor unit via refrigerant connection pipes; at least one first temperature sensor for detecting the return air temperature of each indoor unit; at least one humidity sensor for detecting the ambient humidity of each indoor unit; and a controller configured to: acquire the return air temperature of each indoor unit via the at least one first temperature sensor, and acquire the ambient humidity of each indoor unit via the at least one humidity sensor; determine the return air temperature difference and humidity difference of each indoor unit, wherein, for one indoor unit, the return air temperature difference is the difference between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference is the difference between the ambient humidity of the indoor unit and the set humidity of the indoor unit; if the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system is higher in the high sensible heat mode than in other operating modes. This multi-split air conditioning system achieves high sensible heat cooling, thereby reducing compressor frequency and reducing energy consumption.

[0041] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram illustrating the composition of a multi-split air conditioning system, provided as an example of an embodiment of this application. Figure 2 This is a schematic diagram of the internal components of a multi-split air conditioning system provided in an embodiment of this application. The following is in conjunction with... Figure 1 and Figure 2 This application introduces a multi-split air conditioning system provided in its embodiments.

[0043] The multi-split air conditioning system 100 includes an outdoor unit 11, an indoor unit 12, an indoor unit 13, and a controller 14. Figure 1 (Not shown in the image). In this case, each indoor unit in at least one indoor unit is connected to the outdoor unit via refrigerant connection pipes.

[0044] Figure 1 The previous example only involved one outdoor unit connected to two indoor units. This application provides a multi-split air conditioning system where one outdoor unit connects to multiple indoor units. Figure 1 The composition of the multi-split air conditioning system does not constitute a limitation on this multi-split air conditioning system.

[0045] Outdoor unit 11 is typically installed outdoors for heat exchange within the indoor environment. Additionally, in... Figure 1 In the illustration, outdoor unit 11 is shown as a dashed line because it is located outdoors on the opposite side of indoor unit 12 or indoor unit 13, separated by a wall.

[0046] The outdoor unit includes: compressor 111, outdoor heat exchanger 112, outdoor fan 113, outdoor expansion valve 114, four-way reversing valve 115, liquid-side shut-off valve 116, and gas-side shut-off valve 117.

[0047] The outdoor unit of a multi-split air conditioning system refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. Each indoor unit of a multi-split air conditioning system includes an indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0048] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. In the cooling mode of the multi-split air conditioning system 100, compressor 111 compresses the refrigerant gas at high temperature and pressure and discharges the compressed refrigerant gas. The refrigerant discharged by compressor 111 flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0049] The expansion valve consists of a valve body and a coil, used for throttling, pressure reduction, and flow regulation. In a multi-split air conditioning system, the expansion valve allows medium-temperature, high-pressure liquid refrigerant to be throttled into low-temperature, low-pressure wet vapor. The refrigerant then absorbs heat in the evaporator to achieve a cooling effect, and the valve flow is controlled by changes in the superheat at the evaporator outlet. Furthermore, when the multi-split air conditioning system 100 is operating in cooling mode, the outdoor expansion valve 114 expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant that has expanded in the electronic expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the multi-split air conditioning system regulates the temperature of the indoor space.

[0050] Indoor unit 12 and indoor unit 13, taking indoor unit 12 as an example of a wall-mounted unit, are typically installed on indoor walls. Another example is a floor-standing unit (…). Figure 1 (Not shown in the figure) is also a type of indoor unit. This multi-split air conditioning system may include an outdoor unit and two or more indoor units, as well as a controller (not shown in the figure) for controlling each indoor unit and the outdoor unit.

[0051] Indoor unit 12 includes: expansion valve 121, expansion valve 122, heat exchanger 123, heat exchanger 124, temperature sensor 125 and humidity sensor 126.

[0052] Indoor unit 13 includes: expansion valve 131, expansion valve 132, heat exchanger 133, heat exchanger 134, temperature sensor 135 and humidity sensor 136.

[0053] In the embodiments shown in this application, controller 14 refers to a device that can generate operation control signals according to instruction opcodes and timing signals, instructing the multi-split air conditioning system to execute control commands. Exemplarily, the controller can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules; this application does not impose any limitations on this.

[0054] In addition, the controller 14 can be used to control the operation of various components inside the multi-split air conditioning system 100 so that the various components of the multi-split air conditioning system 100 can operate to achieve the predetermined functions of the multi-split air conditioning system.

[0055] In some embodiments, the controller 14 can be integrated into the outdoor unit 11, that is, the outdoor unit 11 can control the operation of each component in the multi-split air conditioning system 100.

[0056] In some embodiments, the multi-split air conditioning system 100 is also equipped with a remote control, which has the function of communicating with the controller 14, for example, using infrared or other communication methods. The remote control is used by the user to perform various controls on the multi-split air conditioning system, realizing interaction between the user and the multi-split air conditioning system 100.

[0057] Figure 3This is a schematic diagram of the structure of an outdoor unit 11 provided as an example of an embodiment of this application. Figure 3 As shown, the outdoor unit 11 also includes a humidity sensor 118, a temperature sensor 119, and an electronic expansion valve 121. In some embodiments, Figure 3 Pipes D, E, S, and C shown are all refrigerant flow lines. In cooling mode, the refrigerant flows through the following sequence: compressor 111 discharge port, pipe D, pipe C, pipe E, pipe S, and compressor 111 suction port.

[0058] In some embodiments, humidity sensor 118 and temperature sensor 119 are connected to controller 14. Humidity sensor 118 and temperature sensor 119 can be set at the exhaust port of compressor 111 to detect the outlet temperature and humidity value of compressor 111 and send the detected outlet temperature and humidity value of compressor 111 to controller 14.

[0059] Figure 4 The diagram shown is a hardware configuration block diagram of a multi-split air conditioning system provided in this application according to an exemplary embodiment. Figure 4 As shown, the multi-split air conditioning system 100 may also include the following: a communication interface 130 and a memory 140.

[0060] In some embodiments, the communication interface 130 is used to establish communication connections with other network entities, such as establishing communication connections with terminal devices. The communication interface 130 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking an RF module as an example, the RF module can be used for signal reception and transmission; specifically, it sends received information to the controller 14 for processing; additionally, it transmits signals generated by the controller 14. Typically, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc.

[0061] The memory 140 can be used to store software programs and data. The controller 14 executes various functions of the multi-split air conditioning system 100 and performs data processing by running the software programs or data stored in the memory 140. The memory 140 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. The memory 140 stores the operating system that enables the multi-split air conditioning system 100 to run. In this application, the memory 140 may store the operating system and various application programs, and may also store code that executes the control method of the multi-split air conditioning system provided in the embodiments of this application.

[0062] Those skilled in the art will understand that Figure 4 The hardware structure shown does not constitute a limitation on the multi-split air conditioning system. The multi-split air conditioning system may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0063] like Figure 5 As shown, this application provides a control method for a multi-split air conditioning system, applied to the above-mentioned... Figure 4 The controller 14 in the multi-split air conditioning system 100 shown includes the following steps:

[0064] S101. Obtain the return air temperature of each indoor unit through at least one first temperature sensor, and obtain the ambient humidity of each indoor unit through at least one humidity sensor.

[0065] The return air temperature of each indoor unit is the air temperature at the return air vent of each indoor unit, which is also the ambient temperature of each indoor unit.

[0066] For example, Figure 2 Temperature sensors 125 and 135 are used to detect the return air temperature of at least one indoor unit, and humidity sensors 126 and 136 are used to detect the humidity of at least one indoor unit.

[0067] Optionally, when the multi-split air conditioning system is operating in cooling or dehumidification mode, the controller can periodically acquire the return air temperature and indoor humidity of each indoor unit at a preset frequency. Thus, the control method provided in the embodiments of this application is executed periodically at this preset frequency.

[0068] The preset frequency can be 3 seconds / time, 5 seconds / time, 8 seconds / time, or other possible frequencies.

[0069] S102. Determine the return air temperature difference and humidity difference for each indoor unit.

[0070] The return air temperature difference is the difference between the return air temperature and the set temperature. The set temperature is the desired indoor temperature set by the user via remote control. The humidity difference is the difference between the indoor humidity and the set humidity. The set humidity is the desired indoor humidity set by the user via remote control. It should be understood that the set temperature and set humidity can be the same or different. In practical implementation, the return air temperature is represented by T. i The set temperature is represented by T. s The return air temperature difference is expressed as (T). i -T s ), denoted by c.

[0071] S103. If the maximum return air temperature difference in at least one indoor unit is less than the temperature threshold, and the maximum humidity difference in at least one indoor unit is less than the humidity threshold, then control the outdoor unit of the air conditioner to operate in high sensible heat mode.

[0072] The aforementioned temperature threshold is a temperature value determined based on the set temperature of the multi-split air conditioning system. Optionally, the temperature threshold can be 'a', which can be a possible temperature value such as 0.5℃, 1℃, or 2℃.

[0073] It should be understood that the temperature threshold 'a' refers to a comfort temperature fluctuation value pre-stored within the multi-split air conditioning system and obtained through statistical analysis of a large amount of user data. After obtaining the user-defined set temperature, the controller can adjust the set temperature based on this temperature threshold 'a' to obtain the aforementioned maximum return air temperature difference.

[0074] The humidity threshold can be b, which can be a possible humidity value such as 3%, 4%, 5%, etc.

[0075] It should be understood that the humidity threshold b is the allowable fluctuation range of the actual humidity within the comfort range compared to the set humidity. After obtaining the set humidity determined by the user, the controller can adjust the set humidity based on the humidity threshold b to obtain the aforementioned maximum humidity difference.

[0076] High sensible heat mode refers to an operating mode of a multi-split air conditioning system when it is cooling or dehumidifying. The sensible heat ratio of a multi-split air conditioning system operating in high sensible heat mode is higher than that of other operating modes.

[0077] Optionally, if the maximum return air temperature difference of the indoor unit is less than the temperature threshold and the maximum indoor humidity difference is less than the humidity threshold, the controller will control the outdoor unit to operate in high sensible heat mode.

[0078] For example, when the air conditioner is set to a temperature of 25°C, a humidity of 49%, a temperature threshold a of 2°C, and a humidity threshold b of 5%, if the return air temperature is 26°C and the indoor humidity is 52%, the difference between the return air temperature and the set temperature is small. The multi-split air conditioning system consumes less energy per unit time to lower the indoor temperature, meaning the sensible load is small, and therefore the proportion of the sensible load to the total load is small, resulting in a low sensible heat ratio. If the multi-split air conditioning system were to continue operating according to its original parameters, the resulting cooling capacity would be excessive, consuming unnecessary energy. Therefore, the controller adjusts the operation of each indoor unit in a high sensible heat mode to increase the sensible heat ratio of the multi-split air conditioning system and reduce energy consumption.

[0079] Optionally, the multi-split air conditioning system can have multiple high sensible heat mode levels pre-stored, each with a level parameter.

[0080] In practical implementation, the above level parameters can be represented by F.b express.

[0081] Among them, F b These are function setting values, set via the outdoor unit control board or calculated and assigned by the centralized control system. They are typically 1, 2, 3, etc. b The higher the value, the higher the corresponding high sensible heat mode level, and the higher the sensible heat ratio that can be achieved.

[0082] It should be understood that the centralized control system is set up in the multi-split air conditioning system. This centralized control system connects the various subsystems in the multi-split air conditioning system and is used to centrally process various parameters of the air conditioner and calculate various values ​​of the air conditioner.

[0083] The aforementioned subsystems can be air handling systems composed of multi-split air conditioning systems, dehumidifiers, etc.

[0084] Optionally, the controller can determine the target level parameters for the high sensible heat mode based on the set temperature and the maximum return air temperature difference of each indoor unit.

[0085] For example, F b The method for determining the value of is shown in formula (1):

[0086] F b =p-max(T) i -T s )+1 formula (1)

[0087] Where p is the minimum return air temperature difference when the unit enters the high sensible heat mode, and its value ranges from 0 to F. b ≤p.

[0088] Furthermore, the controller can control the outdoor unit to operate at the target high sensible heat rating corresponding to the target rating parameters based on the preset correspondence and target rating parameters.

[0089] The preset correspondence is used to indicate the correspondence between at least one grade parameter and at least one high sensible heat grade.

[0090] For example, the preset correspondence can be implemented in the form of a correspondence table. Table 1 shows one such correspondence table. As shown in Table 1, the preset correspondence can include multiple F... b Values ​​and multiple high sensible heat ratings, and multiple F... b The values ​​and multiple high sensible heat levels have a one-to-one correspondence.

[0091] Table 1

[0092]

[0093]

[0094] For example, if F b If the value is 1, the controller can control the outdoor unit to operate in high sensible heat rating 1 mode. If F b If the value is 3, the controller can control the outdoor unit to operate in the high sensible heat level 3 mode.

[0095] In one possible implementation, the controller controlling the multi-split air conditioning system to operate in high sensible heat mode can be specifically implemented through the following steps S11 to S13:

[0096] S11. Determine the evaporation temperature correction value based on the maximum return air temperature difference and the target return air temperature difference value corresponding to the target high sensible heat level.

[0097] The evaporation temperature is the critical temperature at which the refrigerant changes from liquid to gas. The evaporation temperature correction value is used to correct the set evaporation temperature.

[0098] Optionally, the target return air temperature difference value has a corresponding relationship with the high sensible heat rating and / or rating parameters. Therefore, the controller can determine the target return air temperature difference value based on the preset correspondence, according to the target high sensible heat rating and / or target rating parameters.

[0099] For example, the preset correspondence can be implemented in the form of a correspondence table. Table 2 shows one such correspondence table. As shown in Table 2, this correspondence can contain multiple Fs. b Values, multiple high sensible heat ratings, and multiple target return air temperature differences. Furthermore, multiple F... b The values, multiple high sensible heat rating values, and multiple target return air temperature difference values ​​have a one-to-one correspondence.

[0100] In the actual implementation, the target return air temperature difference is represented by c_t.

[0101] Table 2

[0102] <![CDATA[F b Value High sensible heat rating c_t value <![CDATA[F b =1]]> High Sensitive Heat Class 1 c_t = 1 <![CDATA[F b =2]]> High sensible heat rating 2 c_t = 2 <![CDATA[F b =3]]> High sensible heat rating 3 c_t = 3 <![CDATA[F b =4]]> High sensible heat rating 4 c_t = 4

[0103] For example, if the centralized control system issues F b If the value is 1, then the target return air temperature difference value c_t is 1. If the F issued by the centralized control system... b If the value is 3, then the target return air temperature difference value c_t is 3.

[0104] In some embodiments, the controller can determine the actual return air temperature difference between the return air temperature of each indoor unit and the set temperature. Then, the difference between the target return air temperature difference and the actual return air temperature difference is determined as the evaporation temperature correction value.

[0105] In practical implementation, the difference between the target return air temperature difference c_t and the actual return air temperature difference c is represented by d, and its calculation method is shown in formula (2):

[0106] d = c_t - c (Formula 2)

[0107] The evaporation temperature correction value for the target evaporation temperature is represented by e, and its calculation method is shown in formula (3):

[0108] e = K pt ×(d (n) -d (n-1) )+K it ×d (n) Formula (3)

[0109] Specifically, K pt K it It is a fixed coefficient. d (n) This represents the difference between the current return air temperature difference c and the target return air temperature difference c_t. (n-1) This is the difference between the previous return air temperature difference value *c* and the target return air temperature difference value *c_t*. Optional, K pt K it The value of can be 1 for all values. The range of the evaporation temperature correction value e is 0 ≤ e ≤ 10.

[0110] It should be noted that in multi-split air conditioning systems with a centralized control system, the controller uses the return air temperature as an intermediate variable to correct the evaporator temperature, and adjusts the evaporator temperature based on the F calculated by the controller. b The value is used to control the compressor's operating frequency, thereby entering the high sensible heat operation mode.

[0111] S12. Determine the target evaporation temperature based on the preset evaporation temperature and evaporation temperature correction value during the operation of the multi-split air conditioning system.

[0112] In some embodiments, if d > 0, then e > 0. If d ≤ 0, then e = 0.

[0113] In practical implementation, the target evaporation temperature is represented by Teo. The method for correcting the target evaporation temperature is shown in formula (4):

[0114] Teo=Teoset+e formula (4)

[0115] Specifically, Teoset sets the evaporation temperature for the system. This can be the default evaporation temperature for the multi-split air conditioning system, or it can be the evaporation temperature value set by the user via the air conditioner remote control.

[0116] S13. Adjust the operating frequency of the compressor in the multi-split air conditioning system according to the target evaporation temperature.

[0117] In some embodiments, the controller can compare the target evaporation temperature with the actual evaporation temperature and adjust the operating frequency of the compressor in the multi-split air conditioning system based on the comparison results.

[0118] Specifically, if the actual evaporation temperature is higher than the target evaporation temperature, the controller can increase the compressor's operating frequency. If the actual evaporation temperature is equal to the target evaporation temperature, the compressor's operating frequency remains unchanged. If the actual evaporation temperature is lower than the target evaporation temperature, the compressor's operating frequency is decreased.

[0119] In some embodiments, if the multi-split air conditioning system has a central control system and a separate dehumidifier, the controller can be configured to set F. b The high sensible heat mode is controlled in a manner described in S11-S13 above, and will not be repeated here.

[0120] In some embodiments, if a multi-split air conditioning system has a centralized control system but no separate dehumidifier, the controller can also be configured via F. b The high sensible heat mode is controlled in a manner described in S11-S13 above, and will not be repeated here. However, in practice, since multi-split air conditioning systems do not have a separate dehumidifier, this control method may result in uncontrollable indoor humidity.

[0121] In another possible implementation, if there is no dedicated central control system in the multi-split air conditioning system, the controller adjusts the operating frequency of the compressor of the multi-split air conditioning system according to the target outlet air temperature corresponding to the target high sensible heat rating.

[0122] Optionally, the operating frequency of the compressor in the multi-split air conditioning system can be adjusted based on the comparison results by comparing the target air outlet temperature with the actual air outlet temperature.

[0123] Specifically, the controller adjusts the operating frequency of the compressor in the multi-split air conditioning system based on the target outlet air temperature corresponding to the target high sensible heat rating. If the actual outlet air temperature is lower than the target outlet air temperature, the compressor operating frequency is reduced. If the actual outlet air temperature is greater than or equal to the target outlet air temperature, the compressor operating frequency remains unchanged.

[0124] In practical implementation, the target outlet air temperature is represented by tset. The outdoor unit adjusts the temperature according to the set F... b The target outlet air temperature tset is set by the value of the actual outlet air temperature and the target outlet air temperature tset is used to control the change of the outdoor unit compressor frequency.

[0125] Furthermore, the controller can control the outdoor unit to operate at a high sensible heat target level based on the preset correspondence and target air outlet temperature.

[0126] The preset correspondence is used to indicate the correspondence between at least one high sensible heat target level and at least one target outlet air temperature.

[0127] Exemplarily, the preset corresponding relationship can be implemented in the form of a correspondence table. Table 3 shows a correspondence table. As shown in Table 3, the preset corresponding relationship may include multiple high sensible heat target levels and multiple target outlet air temperatures tset, and there is a one-to-one correspondence between the multiple high sensible heat target levels and the multiple target outlet air temperatures tset.

[0128] Table 3

[0129] High Sensible Heat Target Level tset value High Sensible Heat Target Level 1 tset=14 High Sensible Heat Target Level 2 tset=15 High Sensible Heat Target Level 3 tset=16 High sensible heat target level 4 tset=17

[0130] Exemplarily, if the high sensible heat target level is 1, the target outlet air temperature tset is 14°C; if the high sensible heat target level value is 4, the target outlet air temperature tset is 17°C.

[0131] In some embodiments, when the actual outlet air temperature < tset, the compressor frequency decreases; when the actual outlet air temperature ≥ tset, the compressor frequency remains unchanged.

[0132] Exemplarily, if the target outlet air temperature tset is 26°C, when the actual outlet air temperature is 25°C, the controller controls the outdoor unit compressor to reduce the operating frequency; when the actual outlet air temperature is 27°C, the controller controls the outdoor unit compressor to maintain the current operating frequency.

[0133] It should be understood that in a common air conditioning system, when the indoor unit return air temperature difference is equal to 0, that is, when the return air temperature is the same as the set temperature, the compressor stops running. b After the F value is set, when the return air temperature is the same as the set temperature, the controller controls the outdoor unit compressor to reduce the operating frequency, that is, the outdoor unit enters the high sensible heat operation mode.

[0134] In some embodiments, if the maximum return air temperature difference of each indoor unit is greater than or equal to the temperature threshold, and / or the maximum indoor humidity difference is greater than or equal to the humidity threshold, then the air conditioning outdoor unit is controlled to end the high sensible heat mode.

[0135] When the multi-connected air conditioning system operates in the high sensible heat mode, the controller can also periodically obtain the return air temperature and indoor humidity of each indoor unit at a preset frequency to determine whether to end the high sensible heat mode.

[0136] The above preset frequency can be 3 seconds / time, 5 seconds / time, 8 seconds / time or other possible frequencies.

[0137] For example, when the air conditioner is set to 25℃ and the temperature threshold 'a' is 2℃, if the return air temperature is 28℃, then 28℃ > 25℃ + 2℃. The difference between the return air temperature and the set temperature is significant, resulting in a large proportion of sensible load to total load, meaning a high sensible heat ratio for the air conditioner. If the multi-split air conditioning system continues to operate according to its original parameters, the resulting cooling capacity will be too low, failing to achieve a satisfactory cooling effect. Therefore, the controller stops the outdoor unit from operating in high sensible heat mode to reduce the sensible heat ratio of the multi-split air conditioning system.

[0138] The technical solution provided in this application offers at least the following beneficial effects: It provides an operating mode for a multi-split air conditioning system, namely a high sensible heat mode, where the sensible heat ratio is higher than in other modes. Furthermore, this application determines whether the conditions for operating the high sensible heat mode are met based on the actual temperature and humidity, i.e., set temperature and humidity thresholds. When the conditions for operating the high sensible heat mode are met, it indicates that the indoor temperature and humidity are suitable, thus allowing for control of the high sensible heat mode operation to reduce the energy consumed in regulating indoor temperature and humidity, thereby achieving energy conservation.

[0139] In some embodiments, in conjunction with the above Figure 5 The control method for the multi-split air conditioning system provided in this application embodiment can also be described as follows: Figure 6 The logic flowchart shown is as follows. Figure 6 As shown:

[0140] S1. The controller controls the multi-split air conditioning system to enter the high sensible heat operation mode. When the multi-split air conditioning system is operating in the high sensible heat mode, the controller can determine whether there is a centralized control system in the multi-split air conditioning system. If there is a centralized control system, execute the following steps S2-S7; if there is no centralized control system, execute the following steps S8-S10.

[0141] S2. The controller calculates the difference d between the actual return air temperature difference and the target return air temperature difference, where the actual return air temperature difference is the difference between the actual return air temperature and the set temperature.

[0142] S3. Calculate the target evaporation temperature correction value e based on the difference d between the actual return air temperature difference and the target return air temperature difference.

[0143] Optionally, if d is greater than 0, then e is calculated according to the above formula (3). If d is less than or equal to 0, then e is 0.

[0144] S4. Calculate the target evaporation temperature Teo based on the target evaporation temperature correction value e. The calculation method is as described in formula (4) above.

[0145] Optionally, if the actual evaporation temperature - target evaporation temperature > 0, then execute the following step S5. If the actual evaporation temperature - target evaporation temperature < 0, then execute the following step S6. If the actual evaporation temperature - target evaporation temperature = 0, then execute the following step S7.

[0146] S5. The controller controls to increase the operating frequency of the compressor.

[0147] S6. The controller controls to decrease the operating frequency of the compressor.

[0148] S7. The controller controls the operating frequency of the compressor to remain unchanged.

[0149] S8. The controller sets the target outlet air temperature tset. Optionally, if the actual outlet air temperature of the air conditioner < tset, then execute the following step S9. If the actual outlet air temperature of the air conditioner ≥ tset, then execute the following step S10.

[0150] S9. The controller controls to decrease the operating frequency of the compressor.

[0151] S10. The controller controls the operating frequency of the compressor to remain unchanged.

[0152] It can be seen that the above mainly introduces the solution provided by the embodiments of the present application from the perspective of the method. To implement the above functions, the embodiments of the present application provide the corresponding hardware structure and / or software module for each function. Those skilled in the art should easily realize that, combining the modules and algorithm steps of each example described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or the combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0153] The embodiments of the present application can divide the function modules of the controller according to the above method examples. For example, each function module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software function module. Optionally, the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0154] The embodiments of the present application also provide a schematic diagram of the hardware structure of a controller, as Figure 7As shown, the controller 14 includes a processor 1001, and optionally, a memory 140 and a communication interface 130 connected to the processor 1001. The processor 1001, memory 140 and communication interface 130 are connected via a bus 1004.

[0155] Processor 1001 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. Processor 1001 may also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 1001 may also include multiple CPUs, and processor 1001 may be a single-core processor or a multi-core processor. Here, "processor" can refer to one or more devices, circuits, or processing cores used to process data (e.g., computer program instructions).

[0156] The memory 140 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or it may be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 140 may exist independently or be integrated with the processor 1001. The memory 140 may contain computer program code. The processor 1001 executes the computer program code stored in the memory 140 to implement the control method for a multi-split air conditioning system provided in this application embodiment.

[0157] The communication interface 130 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 130 can be a module, circuit, transceiver, or any device capable of enabling communication.

[0158] Bus 1004 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Bus 1004 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0159] This invention also provides a computer-readable storage medium, which includes computer-executable instructions. When the computer executes the instructions on the computer, it causes the computer to perform a control method for a multi-split air conditioning system as provided in the above embodiments.

[0160] This invention also provides a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize the control method of a multi-split air conditioning system provided in the above embodiments.

[0161] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0162] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0163] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and other division methods may exist in actual implementation. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate; components shown as units may be one physical unit or multiple physical units, i.e., they may be located in one place or distributed in multiple different places. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0164] Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0165] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-split air conditioning system, characterized in that, include: Outdoor unit; At least one indoor unit, wherein each indoor unit is connected to the outdoor unit via a refrigerant connection pipe; At least one first temperature sensor is used to detect the return air temperature of each indoor unit; At least one humidity sensor is provided for detecting the ambient humidity of each indoor unit; The controller is configured as follows: The return air temperature of each indoor unit is obtained through the at least one first temperature sensor, and the ambient humidity of each indoor unit is obtained through the at least one humidity sensor. The return air temperature difference and humidity difference of each indoor unit are determined respectively. For one indoor unit, the return air temperature difference is the difference between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference is the difference between the ambient humidity of the indoor unit and the set humidity of the indoor unit. If the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system is higher in the high sensible heat mode than in other operating modes; the controller is specifically configured as follows: The target level parameters for the high sensible heat mode are determined based on the maximum return air temperature difference. According to the preset correspondence and the target level parameter, the outdoor unit is controlled to operate at the target high sensible heat level corresponding to the target level parameter. The preset correspondence is used to indicate the correspondence between the level parameter and the high sensible heat level.

2. The multi-split air conditioning system according to claim 1, characterized in that, The controller is also configured to: If the maximum return air temperature difference is greater than or equal to the temperature threshold, and / or the maximum humidity difference is greater than or equal to the humidity threshold, then the outdoor unit is controlled to stop operating the high sensible heat mode.

3. The multi-split air conditioning system according to claim 1, characterized in that, The outdoor unit includes a compressor; The controller is also configured to: The evaporation temperature correction value is determined based on the maximum return air temperature difference and the target return air temperature difference value corresponding to the target high sensible heat level. The target evaporation temperature is determined based on the preset evaporation temperature and the evaporation temperature correction value during the operation of the multi-split air conditioning system. The operating frequency of the compressor in the multi-split air conditioning system is adjusted according to the target evaporation temperature.

4. The multi-split air conditioning system according to claim 3, characterized in that, The multi-split air conditioning system also includes: The second temperature sensor is used to detect the actual evaporation temperature of the evaporator; The controller is specifically configured as follows: If the actual evaporation temperature is greater than the target evaporation temperature, then the operating frequency of the compressor is increased; If the actual evaporation temperature is equal to the target evaporation temperature, then the operating frequency of the compressor is kept constant. If the actual evaporation temperature is lower than the target evaporation temperature, then the operating frequency of the compressor is reduced.

5. The multi-split air conditioning system according to claim 3 or 4, characterized in that, The controller is specifically controlled as follows: Determine the difference between the target return air temperature difference and the maximum return air temperature difference; The evaporation temperature correction value is determined based on the difference between the target return air temperature difference and the maximum return air temperature difference.

6. The multi-split air conditioning system according to claim 1, characterized in that, The controller is also configured to: The operating frequency of the compressor in the multi-split air conditioning system is adjusted according to the target outlet air temperature corresponding to the target high sensible heat rating.

7. The multi-split air conditioning system according to claim 6, characterized in that, The multi-split air conditioning system also includes: At least one third temperature sensor is used to detect the air outlet temperature of each indoor unit; The controller is specifically controlled as follows: The actual air outlet temperature of the indoor unit corresponding to the maximum return air temperature difference is detected by the third temperature sensor. If the actual outlet air temperature is lower than the target outlet air temperature, then the operating frequency of the compressor is reduced. If the actual outlet air temperature is greater than or equal to the target outlet air temperature, the operating frequency of the compressor is controlled to remain unchanged.

8. A control method for a multi-split air conditioning system, characterized in that, The method includes: The return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the ambient humidity of each indoor unit is obtained through at least one humidity sensor. The return air temperature difference and humidity difference of each indoor unit are determined separately. For one indoor unit, the return air temperature difference is the difference between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference is the difference between the ambient humidity of the indoor unit and the set humidity of the indoor unit. If the maximum return air temperature difference in at least one indoor unit is less than a temperature threshold, and the maximum humidity difference in at least one indoor unit is less than a humidity threshold, then the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system is higher than other operating modes in the high sensible heat mode; the control of the outdoor unit to operate in the high sensible heat mode includes: determining the target level parameters of the high sensible heat mode based on the maximum return air temperature difference. According to the preset correspondence and the target level parameter, the outdoor unit is controlled to operate at the target high sensible heat level corresponding to the target level parameter. The preset correspondence is used to indicate the correspondence between the level parameter and the high sensible heat level.

9. The method according to claim 8, characterized in that, The method further includes: The evaporation temperature correction value is determined based on the maximum return air temperature difference and the target evaporation temperature difference value corresponding to the target high sensible heat level. The target evaporation temperature is determined based on the preset evaporation temperature and the evaporation temperature correction value during the operation of the multi-split air conditioning system. The operating frequency of the compressor in the multi-split air conditioning system is adjusted according to the target evaporation temperature.

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