Multi-connected air conditioner, control method thereof and computer readable storage medium

Abstract

The application discloses a control method of a multi-connected air conditioner, which comprises the following steps: acquiring the indoor environment humidity of a space where a target indoor unit is located when the multi-connected air conditioner is in refrigeration operation; the target indoor unit is an indoor unit that opens a preset wind feeling mode among the at least two indoor units, and the air outlet wind speed of the target indoor unit in the preset wind feeling mode is less than a preset wind speed; determining a target superheat degree of the target indoor unit according to the indoor environment humidity; and controlling the target electronic expansion valve adjustment opening degree according to the target superheat degree, wherein the target electronic expansion valve is an electronic expansion valve in the target indoor unit. The application also discloses a multi-connected air conditioner and a computer readable storage medium. The application aims to effectively balance the condensation prevention and the refrigeration effect when the multi-connected air conditioner opens the windless function.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a control method for multi-split air conditioners, multi-split air conditioners, and computer-readable storage media. Background Technology

[0002] Multi-split air conditioners typically consist of one outdoor unit connected to more than one indoor unit. With economic and technological development, the application of multi-split air conditioners is becoming increasingly widespread, and users' performance requirements for them are constantly rising.

[0003] Currently, when the indoor unit of a multi-split air conditioner is activated with the "no-wind" function, the outdoor unit typically adjusts its operating frequency. However, if some indoor units require "no-wind" operation while others need normal cooling, an excessively high outdoor unit frequency can cause condensation to form on the indoor units operating with "no-wind" mode, while an excessively low outdoor unit frequency can result in poor cooling performance on the indoor units requiring normal cooling. Therefore, it is evident that the current adjustment process in multi-split air conditioners after activating the "no-wind" function cannot effectively balance condensation prevention and cooling performance. Summary of the Invention

[0004] The main objective of this invention is to provide a control method for a multi-split air conditioner, a multi-split air conditioner, and a computer-readable storage medium, which aims to achieve an effective balance between anti-condensation and cooling effect when the windless function of the multi-split air conditioner is activated.

[0005] To achieve the above objectives, the present invention provides a control method for a multi-split air conditioner, the multi-split air conditioner including a compressor and at least two indoor units, the compressor being connected to each of the indoor units, and the control method for the multi-split air conditioner including the following steps:

[0006] When the multi-split air conditioner is in cooling mode, the indoor humidity of the space where the target indoor unit is located is obtained; the target indoor unit is the indoor unit among the at least two indoor units that has the preset wind-sensing mode turned on, and the air outlet speed of the target indoor unit in the preset wind-sensing mode is less than the preset wind speed.

[0007] The target superheat of the target indoor unit is determined based on the indoor ambient humidity.

[0008] The target electronic expansion valve is adjusted according to the target superheat, and the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

[0009] Optionally, the control method for the multi-split air conditioner further includes:

[0010] When the multi-split air conditioner is in cooling mode, if the target indoor unit enters the preset wind-sensing mode, the target electronic expansion valve is controlled to operate according to the preset superheat and the step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is performed.

[0011] After the step of determining the target superheat of the target indoor unit based on the indoor ambient humidity, the method further includes:

[0012] When the multi-split air conditioner reaches the first preset condition, the step of adjusting the opening of the target electronic expansion valve according to the target superheat is executed;

[0013] Wherein, the preset superheat is less than or equal to the target superheat.

[0014] Optionally, the first preset condition includes at least one of the following:

[0015] The duration during which the target indoor unit operates in the preset fan mode is longer than the preset duration;

[0016] The evaporation temperature of the target indoor unit is lower than the target evaporation temperature, or the evaporation pressure of the target indoor unit is lower than the target evaporation pressure;

[0017] The compressor's exhaust temperature is lower than the preset exhaust temperature;

[0018] The superheat of the compressor's exhaust is less than the preset superheat of the exhaust.

[0019] Optionally, after the step of obtaining the indoor humidity of the space where the target indoor unit is located, the method further includes:

[0020] The target evaporation temperature or the target evaporation pressure is determined based on the indoor ambient humidity.

[0021] The target evaporation temperature or the target evaporation pressure tends to increase with the increase of indoor ambient humidity.

[0022] Optionally, after the step of controlling the opening of the target electronic expansion valve according to the target superheat, the method further includes:

[0023] When the multi-split air conditioner reaches the second preset condition, the target electronic expansion valve is controlled to operate according to the preset superheat degree, wherein the preset superheat degree is less than or equal to the target superheat degree.

[0024] Optionally, the second preset condition includes at least one of the following:

[0025] The target indoor unit exits the preset fan mode;

[0026] The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature;

[0027] The superheat of the compressor's exhaust is greater than or equal to the preset superheat of the exhaust.

[0028] Optionally, the step of obtaining the indoor ambient humidity of the space where the target indoor unit is located may be performed simultaneously or after the following steps:

[0029] Obtain the indoor ambient temperature of the space where the target indoor unit is located;

[0030] When the indoor ambient temperature is less than or equal to a first preset temperature threshold and the indoor ambient humidity is less than or equal to a first preset humidity threshold, the target indoor fan is controlled to run at a speed less than the set speed.

[0031] When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, the operating speed of the target indoor fan is adjusted according to the indoor ambient temperature and the set temperature of the target indoor unit.

[0032] Wherein, the target indoor fan is the fan in the target indoor unit, the second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

[0033] Optionally, the step of obtaining the indoor ambient humidity of the space where the target indoor unit is located may be performed simultaneously or after the following steps:

[0034] Obtain the indoor ambient temperature of the space where the target indoor unit is located;

[0035] When the indoor ambient temperature is less than or equal to a first preset temperature threshold and the indoor ambient humidity is less than or equal to a first preset humidity threshold, the target air guide plate is controlled to operate in a first air guiding state.

[0036] When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, the target air guide plate is controlled to operate in the second air guiding state.

[0037] The target air guide plate is located at the air outlet of the target indoor unit. The target air guide plate has multiple air dispersing holes. In the first air guiding state, all the air in the air duct of the target indoor unit enters the room through the air dispersing holes. In the second air guiding state, a gap is formed between the target air guide plate and the air outlet. Part of the air in the air duct of the target indoor unit enters the room through the air dispersing holes, and another part enters the room through the gap.

[0038] The second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

[0039] Furthermore, to achieve the above objectives, this application also proposes a multi-split air conditioner, which includes:

[0040] At least two indoor units;

[0041] A compressor, which is connected to each of the indoor units;

[0042] A control device, wherein the indoor unit and the compressor are both connected to the control device, the control device includes: a memory, a processor, and a control program for a multi-split air conditioner stored in the memory and executable on the processor, wherein when the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for the multi-split air conditioner as described above.

[0043] In addition, to achieve the above objectives, this application also proposes a computer-readable storage medium storing a control program for a multi-split air conditioner, wherein the control program for the multi-split air conditioner, when executed by a processor, implements the steps of the control method for the multi-split air conditioner as described in any of the preceding claims.

[0044] This invention proposes a control method for a multi-split air conditioner. Based on a multi-split air conditioner including a compressor and at least two indoor units connected to the compressor, when the multi-split air conditioner is in cooling operation and there is a target indoor unit requiring a preset low-speed fan mode, the method adjusts the opening of the electronic expansion valve of the target indoor unit based on the superheat determined by the ambient humidity of the space where the target indoor unit is located. This electronic expansion valve opening adapts to the ambient humidity adjustment, allowing the refrigerant flow into the target indoor unit to be adapted to the indoor humidity, effectively preventing condensation in the target indoor unit. Furthermore, the change in the refrigerant flow into the target indoor unit compensates for the refrigerant flow in other indoor units, ensuring that the cooling effect of other indoor units is not affected when the target indoor unit is in preset fan mode. This achieves a balance between anti-condensation and cooling effect when the multi-split air conditioner is in fanless mode. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the multi-split air conditioner of the present invention;

[0046] Figure 2 This is a flowchart illustrating an embodiment of the control method for a multi-split air conditioner according to the present invention;

[0047] Figure 3 This is a schematic flowchart of another embodiment of the control method for multi-split air conditioners of the present invention;

[0048] Figure 4 This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0049] Figure 5This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0050] Figure 6 This is a flowchart illustrating another embodiment of the control method for multi-split air conditioners of the present invention.

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0053] The main solution of this invention is as follows: Based on a multi-split air conditioner equipped with a compressor and at least two indoor units connected to the compressor, when the multi-split air conditioner is in cooling operation, the indoor humidity of the space where the target indoor unit is located is obtained; the target indoor unit is the indoor unit among the at least two indoor units that has a preset airflow mode activated, and the airflow velocity of the target indoor unit in the preset airflow mode is less than a preset airflow velocity; the target superheat of the target indoor unit is determined based on the indoor humidity; the opening of the target electronic expansion valve is adjusted according to the target superheat, and the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

[0054] In current technology, when the indoor unit of a multi-split air conditioner is activated with the "no-wind" function, the outdoor unit typically adjusts its operating frequency. However, if some indoor units require "no-wind" operation while others need normal cooling, an excessively high outdoor unit frequency can cause condensation to form on the indoor units operating with "no-wind" mode, while an excessively low outdoor unit frequency can result in poor cooling performance on the indoor units requiring normal cooling. Therefore, it is evident that current multi-split air conditioners, when the "no-wind" function is activated, cannot effectively balance condensation prevention and cooling performance.

[0055] The present invention provides the above-mentioned solution, which aims to achieve an effective balance between anti-condensation and cooling effect when the windless function of a multi-split air conditioner is turned on.

[0056] This invention provides a multi-split air conditioner.

[0057] Specifically, in this embodiment, referring to Figure 1 A multi-split air conditioner includes a compressor 1, at least two indoor units 2, and a control device. The compressor 1 is connected to each of the indoor units 2, and both the compressor 1 and each of the indoor units 2 are connected to the control device. At least two indoor units 2 are arranged in parallel. In this embodiment, the number of indoor units 2 is three. In other embodiments, the number of indoor units 2 can be set to more or fewer, such as two, four, or five, depending on actual needs. Different indoor units 2 are distributed in different spatial areas.

[0058] Each indoor unit 2 includes an indoor heat exchanger and an electronic expansion valve connected in series with the indoor heat exchanger. The electronic expansion valve can be used to regulate the refrigerant flow to the indoor heat exchanger connected in series. Specifically, since the indoor units 2 are arranged in parallel, when the electronic expansion valve regulates the refrigerant flow to its series-connected indoor heat exchanger, it simultaneously affects the refrigerant flow to other indoor heat exchangers connected in parallel with it. For example, when the electronic expansion valve reduces the flow to its series-connected indoor heat exchanger by decreasing its opening, the refrigerant flow to other indoor heat exchangers connected in parallel with that indoor heat exchanger will increase, provided the opening of the electronic expansion valves of other indoor units 2 remains unchanged.

[0059] Specifically, each indoor unit 2 may also include an indoor fan corresponding to the indoor heat exchanger. When the indoor fan is turned on, it can drive the air in the space where the indoor unit 2 is located into the indoor unit 2 and exchange heat through the corresponding indoor heat exchanger. The air after heat exchange is then sent into the space where the indoor unit 2 is located.

[0060] Furthermore, each indoor unit 2 may be equipped with at least one humidity sensor 3 to detect the indoor humidity of the space where each indoor unit 2 is located. The humidity sensor 3 may be connected to a control device, which may acquire the humidity data detected by the humidity sensor 3.

[0061] Furthermore, the multi-split air conditioner may also be equipped with a first temperature sensor 4 to detect the exhaust temperature of the compressor 1. Specifically, the first temperature sensor 4 may be located at the exhaust port of the compressor 1. The first temperature sensor 4 may be connected to a control device, which can acquire the temperature data detected by the first temperature sensor 4.

[0062] Furthermore, the multi-split air conditioner may also be equipped with more than one second temperature sensor 5 for detecting the evaporation temperature of the indoor heat exchanger. Specifically, at least one second temperature sensor 5 is installed in each indoor unit 2. The second temperature sensor 5 may be located in the middle of the coil of the indoor heat exchanger. The second temperature sensor 5 may be connected to a control device, which can acquire the temperature data detected by the second temperature sensor 5.

[0063] Furthermore, in embodiments of the present invention, reference is made to... Figure 1 The control device for a multi-split air conditioner includes a processor 1001 (e.g., CPU), a memory 1002, etc. The processor 1001 and the memory 1002 are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0064] Those skilled in the art will understand that Figure 1The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0065] like Figure 1 As shown, the memory 1002, which is a computer-readable storage medium, may include a control program for a multi-split air conditioner. Figure 1 In the device shown, the processor 1001 can be used to call the control program of the multi-split air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the multi-split air conditioner in the following embodiments.

[0066] This invention also provides a control method for a multi-split air conditioner, which is applied to control the aforementioned multi-split air conditioner.

[0067] Reference Figure 2 This application proposes an embodiment of a control method for a multi-split air conditioner. In this embodiment, the control method for the multi-split air conditioner includes:

[0068] Step S10: When the multi-split air conditioner is in cooling operation, obtain the indoor ambient humidity of the space where the target indoor unit is located; the target indoor unit is the indoor unit among the at least two indoor units that has the preset wind-sensing mode turned on, and the air outlet speed of the target indoor unit in the preset wind-sensing mode is less than the preset wind speed.

[0069] During the cooling operation of a multi-split air conditioner, at least one indoor unit among all indoor units will be turned on and running in cooling mode. Specifically, this can be achieved by having some indoor units running in cooling mode while others are turned off, or by having all indoor units running in cooling mode, depending on the actual cooling demand of the space where the indoor units are located.

[0070] The target indoor unit is specifically the indoor unit that is turned on and operating in cooling mode and has the preset fan mode activated. Specifically, during the cooling operation of a multi-split air conditioner, if a command to activate the preset fan mode is received, the indoor unit receiving the command can be identified as the target indoor unit.

[0071] While the target indoor unit is running in the preset fan mode, the indoor humidity of the space where the target indoor unit is located can be detected in real time or at set intervals. The indoor humidity of the space where the target indoor unit is located can be detected by the humidity sensor installed in the target indoor unit.

[0072] Specifically, when there are more than one target indoor unit, the indoor humidity of the space where each target indoor unit is located can be detected separately.

[0073] The preset fan speed can be a system default parameter or a parameter set by the user. If the outlet fan speed is lower than the preset fan speed, it indicates that the outlet fan speed of the target indoor unit is low. In the preset fan speed mode, the target indoor unit requires low-speed airflow to meet the comfort needs of the users in its space. The preset fan speed mode can be activated by the user inputting a control command, or it can be activated by the indoor unit when it detects that the scene parameters of its space have reached a preset state. In this embodiment, the preset fan speed mode is a no-fan speed mode.

[0074] Step S20: Determine the target superheat of the target indoor unit based on the indoor ambient humidity;

[0075] The target superheat is the desired temperature difference between the refrigerant outlet temperature and the refrigerant inlet temperature of the indoor heat exchanger in the target indoor unit. Let T2B be the refrigerant outlet temperature of the indoor heat exchanger and T2A be the refrigerant inlet temperature. Then, the superheat SH = T2B - T2A, and the target superheat is the target value of SH.

[0076] Different indoor humidity levels correspond to different target superheat levels. Specifically, the higher the indoor humidity, the greater the target superheat level.

[0077] The correspondence between indoor ambient humidity and target superheat can be preset, and can take the form of a calculation formula, mapping relationship, etc. Based on this correspondence, the target superheat corresponding to the current indoor ambient humidity can be determined. For example, a calculation formula between humidity and superheat can be preset, and the target superheat corresponding to the target indoor unit can be calculated by substituting the current indoor ambient humidity of the target indoor unit into the calculation formula; or, a mapping table between humidity and superheat can be preset, and the target superheat corresponding to the target indoor unit can be used by querying the mapping table with the current indoor ambient humidity of the target indoor unit.

[0078] When there is more than one target indoor unit (i.e., more than one indoor unit is in preset fan mode), the target superheat for each target indoor unit can be determined based on the indoor humidity corresponding to each target indoor unit. Since the humidity of the spaces where different target indoor units are located is different, the target superheat for different target indoor units may be different.

[0079] Furthermore, the correspondence between humidity and superheat for each target indoor unit can be the same or different. For example, a first preset correspondence between humidity and superheat can be set in advance, and the target superheat for each target indoor unit can be determined based on the first preset correspondence. Alternatively, more than one second preset correspondence between humidity and superheat can be set in advance, and different second preset correspondences can be associated with different indoor fan speeds. Based on this, the fan speed in each target indoor unit can be obtained separately, and the target superheat corresponding to the indoor ambient humidity of the target indoor unit can be determined based on the second preset correspondence associated with the obtained fan speed.

[0080] Step S30: Adjust the opening of the target electronic expansion valve according to the target superheat, wherein the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

[0081] Specifically, the opening of the electronic expansion valve in the target indoor unit is adjusted to regulate the refrigerant flow in the indoor heat exchanger of the target indoor unit, so that the actual superheat of the indoor heat exchanger in the target indoor unit reaches the target superheat.

[0082] When there is more than one target indoor unit, the opening of the electronic expansion valve in each target indoor unit is controlled according to the target superheat corresponding to each target indoor unit. For example, if there are more than one target indoor unit, and any two indoor units are defined as the first indoor unit and the second indoor unit, respectively, with the target superheat corresponding to the first indoor unit being the first superheat and the target superheat corresponding to the second indoor unit being the second superheat, then the opening of the electronic expansion valve in the first indoor unit is controlled according to the first superheat to ensure that the actual superheat of the indoor heat exchanger in the first indoor unit reaches the first superheat; and the opening of the electronic expansion valve in the second indoor unit is controlled according to the second superheat to ensure that the actual opening of the indoor heat exchanger in the second indoor unit reaches the second superheat.

[0083] Specifically, the indoor units other than the target indoor unit among all the indoor units currently in operation of the multi-split air conditioner are defined as other indoor units. During the process of adjusting the opening of the target electronic expansion valve according to the target superheat, the electronic expansion valves in other indoor units can be adjusted according to the preset superheat.

[0084] This invention proposes a control method for a multi-split air conditioner. Based on a multi-split air conditioner including a compressor and at least two indoor units connected to the compressor, when the multi-split air conditioner is in cooling operation and there is a target indoor unit requiring a preset low-speed fan mode, the method adjusts the opening of the electronic expansion valve of the target indoor unit based on the superheat determined by the ambient humidity of the space where the target indoor unit is located. This electronic expansion valve opening adapts to the ambient humidity adjustment, allowing the refrigerant flow into the target indoor unit to be adapted to the indoor humidity, effectively preventing condensation in the target indoor unit. Furthermore, the change in the refrigerant flow into the target indoor unit compensates for the refrigerant flow in other indoor units, ensuring that the cooling effect of other indoor units is not affected when the target indoor unit is in preset fan mode. This achieves a balance between anti-condensation and cooling effect when the multi-split air conditioner is in fanless mode.

[0085] Furthermore, by adjusting the opening of the electronic expansion valve in the target indoor unit in the above manner, the frequency adjustment of the compressor can be reduced or even avoided, thereby reducing the impact of compressor frequency adjustment on the cooling effect of other indoor units that are on but not in the preset fan mode, thus meeting the low fan speed fan needs of the space where the target indoor unit is located while maintaining the cooling effect of other spaces.

[0086] In addition, when only one indoor unit is in the operating state in a multi-split air conditioner and the indoor unit is in the preset fan mode, the output capacity of the multi-split air conditioner compressor is generally large. Therefore, even if the compressor runs at the lowest frequency, the air outlet temperature of the target indoor unit will still be low. In this embodiment, the opening of the electronic expansion valve in the target indoor unit is adjusted in the above manner to avoid the air outlet temperature being too low, prevent condensation in the target indoor unit, and ensure the comfort of the user in the space where the target indoor unit is located.

[0087] Furthermore, based on the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 3 The control method for the multi-split air conditioner may further include the following steps:

[0088] Step S100: When the multi-split air conditioner is in cooling operation, if the target indoor unit enters the preset wind-sensing mode, the target electronic expansion valve is controlled to operate according to the preset superheat and the step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is executed.

[0089] Step S20: Determine the target superheat of the target indoor unit based on the indoor ambient humidity;

[0090] Step S300: When the multi-split air conditioner reaches the first preset condition, the step of adjusting the opening of the target electronic expansion valve according to the target superheat is executed; wherein, the preset superheat is less than or equal to the target superheat.

[0091] The first preset condition here is specifically the condition that the air conditioner's operating parameters or the environmental parameters of the environment where the air conditioner is located must meet when the target indoor unit has a risk of condensation.

[0092] The preset superheat is the target value of the superheat of the indoor heat exchanger in the preset airflow mode, which is set to achieve cooling.

[0093] The opening of the electronic expansion valve is adjusted according to the preset superheat level so that the actual superheat level of the indoor heat exchanger in the target indoor unit reaches the preset superheat level.

[0094] The higher the target superheat value of the indoor heat exchanger, the smaller the opening of the electronic expansion valve; conversely, the lower the target superheat value of the indoor heat exchanger, the larger the opening of the electronic expansion valve. Based on this, when the electronic expansion valve is controlled according to the preset superheat value, the opening of the electronic expansion valve is greater than or equal to the opening of the electronic expansion valve when the electronic expansion valve is controlled according to the target superheat value.

[0095] In this embodiment, during the initial stage of the target indoor unit entering the preset fan-feed mode, the electronic expansion valve is initially controlled to operate at a relatively small preset superheat level. This helps ensure that the air conditioner can achieve a rapid decrease in indoor ambient temperature with high cooling efficiency. Then, the target electronic expansion valve is controlled to operate at a larger target superheat level. The increased superheat level leads to a decrease in the opening of the target electronic expansion valve, which in turn reduces the amount of refrigerant in the target indoor unit. This prevents condensation in the target indoor unit due to excessively low outlet air temperature, thus preventing condensation problems in the target indoor unit while maintaining indoor cooling performance. The reduced airflow in the target indoor unit increases the amount of refrigerant in other indoor units, which raises the outlet air temperature of the target indoor unit to prevent condensation. Simultaneously, it enhances the cooling performance of other indoor units that are not in preset fan-feed mode, thereby achieving an effective balance between anti-condensation and cooling performance in multi-split air conditioning systems.

[0096] Furthermore, in this embodiment, the first preset condition includes at least one of the following:

[0097] Condition 1: The duration for which the target indoor unit operates in the preset fan mode is greater than the preset duration;

[0098] Condition 2: The evaporation temperature of the target indoor unit is less than the target evaporation temperature, or the evaporation pressure of the target indoor unit is less than the target evaporation pressure;

[0099] Condition 3: The exhaust temperature of the compressor is lower than the preset exhaust temperature;

[0100] Condition 4: The exhaust superheat of the compressor is less than the preset exhaust superheat.

[0101] In one implementation of this embodiment, the first preset condition includes all the conditions listed above. That is, when the electronic expansion valve in the target indoor unit is controlled with the preset superheat as the target, if conditions 1, 2, 3, and 4 are met at the same time, the electronic expansion valve is controlled to operate according to the target superheat. If any of conditions 1, 2, 3, and 4 is not met, the opening of the electronic expansion valve is maintained according to the preset superheat.

[0102] In another implementation of this embodiment, the first preset condition may include some of the conditions listed above. That is, when the electronic expansion valve in the target indoor unit is controlled with the preset superheat as the target, if the air conditioner meets some of the above conditions 1, 2, 3, and 4, the electronic expansion valve is controlled to operate according to the target superheat; if the air conditioner does not meet any of the above conditions 1, 2, 3, and 4, the opening of the electronic expansion valve is maintained according to the preset superheat.

[0103] Here, when the multi-split air conditioner operates under the above conditions, it can be assumed that the target indoor unit with the preset air conditioning mode is at high risk of condensation. At this time, the target electronic expansion valve is operated in a timely manner by controlling the target superheat to reduce the refrigerant flow in the target indoor unit, thereby increasing the outlet air temperature of the target indoor unit in a timely manner to effectively prevent condensation from occurring in the target indoor unit.

[0104] Furthermore, to improve the accuracy of superheat switching and effectively balance the anti-condensation effect and cooling effect in the space where the target indoor unit is located, after step S100, the target evaporation temperature or the target evaporation pressure can be determined based on the indoor ambient humidity; the target evaporation temperature or the target evaporation pressure increases with increasing indoor ambient humidity. Conversely, the target evaporation temperature or the target evaporation pressure decreases with decreasing indoor ambient humidity. Based on this, it can be ensured that the temperature drop effect in the space where the target indoor unit is located is satisfied while its outlet air temperature is not too low.

[0105] It should be noted that the process of determining the target evaporation temperature or target evaporation pressure here is not specifically limited to the order of execution of step S20 above, and can be executed simultaneously or sequentially according to actual needs.

[0106] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 4 After step S30, the following steps are also included:

[0107] Step S40: When the multi-split air conditioner reaches the second preset condition, the target electronic expansion valve is controlled to operate according to the preset superheat, wherein the preset superheat is less than or equal to the target superheat.

[0108] The second preset condition is specifically the condition that the operating parameters of the air conditioner or the environmental parameters of the environment where the air conditioner is located must meet when the target indoor unit has no risk of condensation or when the multi-split air conditioner has a reliability risk.

[0109] In this embodiment, during the process of controlling the operation of the target electronic expansion valve by the target superheat to prevent condensation problems in the target indoor unit, when the air conditioner reaches the second preset condition, the operation is switched to a smaller preset superheat to control the operation of the target electronic expansion valve. This increases the opening of the target electronic expansion valve, effectively preventing the target electronic expansion valve from operating at a small opening for a long time, which could lead to system reliability issues. This ensures that when the multi-split air conditioner is turned on with the windless function, it can effectively balance the anti-condensation and cooling effects, thus ensuring the reliable operation of the multi-split air conditioner.

[0110] Furthermore, in this embodiment, the second preset condition includes at least one of the following:

[0111] Condition 5: The target indoor unit exits the preset fan mode;

[0112] Condition 6: The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature;

[0113] Condition 7: The exhaust superheat of the compressor is greater than or equal to the preset exhaust superheat.

[0114] In this embodiment, when the air conditioner meets any one of conditions 5, 6, or 7, it switches to adjusting the opening of the electronic expansion valve based on a preset superheat level. In other embodiments, when the air conditioner meets any two or all of conditions 5, 6, or 7, it switches to adjusting the opening of the electronic expansion valve based on a preset superheat level.

[0115] When the target indoor unit exits the preset fan-feed mode, it indicates that there is no longer a risk of condensation. At this time, the target indoor unit can switch to a lower target superheat to ensure the cooling effect of the space where the target indoor unit is located. If there are more than one target indoor unit, and some target indoor units exit the preset fan-feed mode while others remain in the preset fan-feed mode, the electronic expansion valve in the indoor units that have exited the preset fan-feed mode will adjust its opening according to the preset superheat, while the electronic expansion valve in the indoor units that remain in the preset fan-feed mode will maintain its opening according to the target superheat.

[0116] The preset exhaust temperature and preset exhaust superheat are critical parameters that distinguish whether the compressor can operate reliably. When the preset exhaust temperature or preset exhaust superheat is too high, the electronic expansion valve is switched to a lower preset superheat to increase its opening, thus preventing the exhaust temperature or exhaust superheat from becoming too high and ensuring the reliable operation of the multi-split air conditioner.

[0117] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 5 The step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is performed simultaneously or after the following steps:

[0118] Step S40: Obtain the indoor ambient temperature of the space where the target indoor unit is located;

[0119] Step S50: When the indoor ambient temperature is less than or equal to the first preset temperature threshold and the indoor ambient humidity is less than or equal to the first preset humidity threshold, control the target indoor fan to run at a speed less than the set speed.

[0120] The set speed can be either the system default setting or a user-defined setting.

[0121] Step S60: When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, adjust the operating speed of the target indoor fan according to the indoor ambient temperature and the set temperature of the target indoor unit.

[0122] Wherein, the target indoor fan is the fan in the target indoor unit, the second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

[0123] The set temperature is specifically the target value that the indoor environment temperature needs to reach during the air conditioning cooling operation.

[0124] Specifically, during the process of adjusting the target indoor fan speed based on the indoor ambient temperature and the set temperature, the temperature difference between the indoor ambient temperature and the set temperature can be determined. The larger the temperature difference, the higher the target indoor fan speed; conversely, the smaller the temperature difference, the lower the target indoor fan speed. Based on this, the fan speed of the indoor unit in the preset airflow mode can be automatically adjusted to adapt to the temperature of the space.

[0125] For example, set conditions 1 and 2 are as follows: Condition 1, ambient temperature T1 - set temperature Ts1 ≤ preset temperature difference Ta; Condition 2, ambient humidity H1 ≤ preset humidity Ha. If conditions 1 and 2 are met for a duration of TIME1, the fan will operate at a fixed low speed Z. Set conditions 3 and 4 are as follows: Condition 3, ambient temperature T1 - set temperature Ts1 ≥ preset temperature difference Tb for a duration of TIME2; Condition 4, ambient humidity H1 ≥ preset humidity Hb for a duration of TIME2. In this case, the fan will operate automatically, and the smaller the ambient temperature and the set temperature difference, the lower the fan speed.

[0126] In this embodiment, when the temperature and humidity of the space where the target indoor unit is located are both low, the fan in the target indoor unit is restricted to operate at a low speed; when the temperature or humidity of the space where the target indoor unit is located is high, the fan speed is automatically adjusted according to the temperature of the space where the target indoor unit is located. Based on this, the cooling capacity and dehumidification capacity of the air conditioner can be matched with the actual comfort needs of the space, ensuring that the multi-split air conditioner will not have condensation problems in the preset wind mode, while the temperature and humidity of the space can meet the user's comfort needs.

[0127] It should be noted that the fan speed control process here is not specifically limited to the order of execution of the electronic expansion valve opening adjustment based on superheat as mentioned above. It can be executed simultaneously or sequentially based on the actual needs of the air conditioner's operation and the environmental conditions of the target indoor unit's environment.

[0128] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 6 The step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is performed simultaneously or after the following steps:

[0129] Step S70: Obtain the indoor ambient temperature of the space where the target indoor unit is located;

[0130] Step S80: When the indoor ambient temperature is less than or equal to the first preset temperature threshold and the indoor ambient humidity is less than or equal to the first preset humidity threshold, control the target air guide plate to operate in the first air guiding state.

[0131] Step S90: When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, control the target air guide plate to operate in the second air guiding state.

[0132] The target air guide plate is located at the air outlet of the target indoor unit. The target air guide plate has multiple air dissipation holes. In the first air guiding state, all the air in the air duct of the target indoor unit enters the room through the air dissipation holes. In the second air guiding state, a gap is formed between the target air guide plate and the air outlet. Part of the air in the air duct of the target indoor unit enters the room through the air dissipation holes, and another part enters the room through the gap. The second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

[0133] Specifically, the air outlet of the target indoor unit can be equipped with a horizontal air guide plate and a vertical air guide plate, with the vertical air guide plate being the specific target air guide plate. In the preset fan mode, the horizontal air guide plate of the target indoor unit's air outlet can maintain maximum opening.

[0134] In this embodiment, when the temperature and humidity of the space where the target indoor unit is located are both low, it indicates that the current temperature and humidity can basically meet the user's comfort needs. At this time, by completely blocking the air outlet with the target air guide plate, the airflow blown out by the target indoor unit is dispersed through the air diffuser holes before being sent into the room, thereby further improving the user's airflow comfort while ensuring that the temperature and humidity meet the user's comfort needs. When the temperature or humidity of the space where the target indoor unit is located is high, it indicates that the temperature and humidity of the space where the target indoor unit is located do not meet the user's comfort needs. At this time, by partially blocking the air outlet with the target air guide plate, it is ensured that the air conditioner delivers air at a low fan speed to meet the user's airflow comfort needs while ensuring the cooling capacity input into the room by the target indoor unit, thereby improving the temperature and humidity comfort of the space.

[0135] It should be noted that the order in which the air guide plate's airflow state is adjusted is not specifically limited to the above-mentioned process of adjusting the opening of the electronic expansion valve based on superheat or the process of controlling the fan speed. The adjustments can be performed simultaneously or sequentially based on the actual needs of the air conditioner's operation and the environmental conditions of the target indoor unit's location.

[0136] Furthermore, based on any of the above embodiments, during the process of controlling the indoor unit in the manner mentioned in the above embodiments, the compressor can be controlled in the manner mentioned in the following embodiments. The specific control method for multi-split air conditioners may also include the following steps:

[0137] Step S1: When the multi-split air conditioner is in cooling mode, if one of the at least two indoor units starts a preset airflow mode, the compressor is controlled to run according to the first evaporation parameter; the airflow speed of the indoor unit corresponding to the preset airflow mode is less than the preset airflow speed.

[0138] During the cooling operation of a multi-split air conditioner, at least one indoor unit among all indoor units will be turned on and running in cooling mode. Specifically, this can be achieved by having some indoor units running in cooling mode while others are turned off, or by having all indoor units running in cooling mode, depending on the actual cooling demand of the space where the indoor units are located.

[0139] The preset fan speed can be a system default parameter or a parameter set by the user. If the outlet fan speed is lower than the preset fan speed, it indicates that the outlet fan speed of the target indoor unit is low. In the preset fan speed mode, the target indoor unit requires a low fan speed to ensure the comfort of users in its space. The preset fan speed mode can be activated by the user inputting a control command, or it can be activated by the indoor unit when it detects that the scene parameters of its space have reached a preset state. In this embodiment, the preset fan speed mode is a no-fan speed mode.

[0140] If some or all of the indoor units in at least one of the indoor units operating in cooling mode are activated in the preset fan mode, the compressor operation can be controlled according to the first evaporation parameter.

[0141] The first evaporation parameter here can be a pre-set fixed parameter (the compressor operating frequency corresponding to it is greater than the set frequency value, that is, the compressor operating frequency corresponding to the first evaporation parameter is medium to high frequency), or it can be a characteristic parameter of the target evaporation state of the indoor heat exchanger when any indoor unit starts the preset air conditioning mode (that is, when it goes from the state where there is no indoor unit with the preset air conditioning mode to the state where there is an indoor unit with the preset air conditioning mode), or it can be a parameter determined according to the current operating conditions of the multi-split air conditioner.

[0142] The first evaporation parameter can be any parameter characterizing the target evaporation state that the target heat exchanger needs to achieve. In this embodiment, the first evaporation parameter includes a target value for at least one of the evaporation temperature and evaporation pressure of the indoor heat exchanger. The indoor heat exchanger temperature corresponding to the first evaporation parameter is lower than a set temperature threshold.

[0143] Controlling the compressor operation according to the first evaporation parameter specifically refers to adjusting the compressor's operating frequency so that the actual evaporation state of the indoor heat exchanger in some or all indoor units, or indoor units with the preset fan mode turned on, can reach the target evaporation state corresponding to the first evaporation parameter.

[0144] Specifically, different first evaporation parameters correspond to different compressor operating frequencies. The lower the indoor heat exchanger temperature corresponding to the first evaporation parameter, the higher the compressor operating frequency.

[0145] In this embodiment, the first evaporation parameter is a preset fixed parameter. When at least one indoor unit turns on the preset fan mode, regardless of the number of preset fan modes turned on, the compressor is controlled to operate according to the preset first evaporation parameter in the initial stage of the preset fan mode being turned on.

[0146] Step S2: When the multi-split air conditioner reaches the first preset condition, the compressor is controlled to operate according to the second evaporation parameter; wherein, the first evaporation parameter and the second evaporation parameter are both characterizing parameters of the target evaporation state that the indoor heat exchanger in the indoor unit needs to achieve, and the indoor heat exchanger temperature corresponding to the second evaporation parameter is greater than the indoor heat exchanger temperature corresponding to the first evaporation parameter.

[0147] The first preset condition specifically refers to the operating parameters of the multi-split air conditioner or the environmental parameters of its environment that need to be met when there is no risk of condensation or when the cooling demand of the target indoor unit is basically met. The first preset condition can be set according to actual needs.

[0148] The second evaporation parameter here can be a preset fixed parameter (the compressor operating frequency corresponding to it is greater than the set frequency value, that is, the compressor operating frequency corresponding to the second evaporation parameter is a medium-low frequency), or it can be a parameter determined according to the environmental parameters (such as temperature and / or humidity) of the indoor unit where the multi-split air conditioner is currently operating or the preset air conditioning mode is turned on.

[0149] The second evaporation parameter can be any parameter characterizing the target evaporation state that the target heat exchanger needs to achieve. In this embodiment, the second evaporation parameter includes a target value for at least one of the evaporation temperature and evaporation pressure of the indoor heat exchanger. The indoor heat exchanger temperature corresponding to the second evaporation parameter is greater than a set temperature threshold.

[0150] Controlling the compressor operation according to the second evaporation parameter specifically refers to adjusting the compressor's operating frequency so that the actual evaporation state of the indoor heat exchanger in some or all indoor units, or indoor units with the preset fan mode turned on, can reach the target evaporation state corresponding to the second evaporation parameter.

[0151] Specifically, different second evaporation parameters correspond to different compressor operating frequencies. The higher the indoor heat exchanger temperature corresponding to the second evaporation parameter, the lower the compressor operating frequency.

[0152] The compressor frequency corresponding to the second evaporation parameter is less than or equal to the compressor frequency corresponding to the first evaporation parameter.

[0153] Furthermore, in this embodiment, the first evaporation parameter includes a first evaporation temperature, the second evaporation parameter includes a second evaporation temperature, and the first evaporation temperature is lower than the second evaporation temperature. Alternatively, the first evaporation parameter includes a first evaporation pressure, the second evaporation parameter includes a second evaporation pressure, and the first evaporation pressure is lower than the second evaporation pressure.

[0154] This invention proposes a control method for a multi-split air conditioner. When the multi-split air conditioner is running in cooling mode and the indoor unit requires a preset low-speed fan mode, the compressor does not directly switch to a fixed low-frequency operation. Instead, it first controls the compressor operation through a first evaporation parameter to ensure the indoor heat exchanger of the indoor unit has a lower temperature for rapid temperature drop, thus guaranteeing the cooling effect. Furthermore, when the multi-split air conditioner reaches the first preset condition, it further controls the compressor operation through a second evaporation parameter to ensure the indoor heat exchanger of the indoor unit has a higher temperature, preventing excessively low outlet air temperature and thus preventing condensation in the indoor unit running the preset fan mode. This achieves an effective balance between anti-condensation and cooling effect when the multi-split air conditioner is in fanless mode.

[0155] Furthermore, in this embodiment, the step of controlling the compressor operation according to the second evaporation parameter is defined as step S2a. Before step S2a, the following steps are also included:

[0156] Step S201: When the multi-split air conditioner reaches the first preset condition, obtain the first ambient humidity of the space where the indoor unit with the preset wind-sensing mode is turned on.

[0157] Define the indoor unit that has the preset airflow mode enabled among at least two indoor units as the target indoor unit.

[0158] While the target indoor unit is running in the preset fan mode, the indoor humidity of the space where the target indoor unit is located can be detected in real time or at set intervals. The indoor humidity of the space where the target indoor unit is located can be detected by the humidity sensor installed in the target indoor unit.

[0159] Step S202: Determine the second evaporation parameter based on the first ambient humidity.

[0160] Different ambient humidity levels correspond to different indoor heat exchanger temperatures for the second evaporation parameter. Specifically, the higher the ambient humidity, the higher the indoor heat exchanger temperature corresponding to the second evaporation parameter. Conversely, the lower the ambient humidity, the lower the indoor heat exchanger temperature corresponding to the second evaporation parameter.

[0161] The correspondence between the first ambient humidity and the second evaporation parameter can be preset, and can take the form of a calculation formula, mapping relationship, etc. Based on this correspondence, the second evaporation parameter corresponding to the current first ambient humidity can be determined. For example, a calculation formula between humidity and superheat can be preset, and the second evaporation parameter corresponding to the target indoor unit can be calculated by substituting the current first ambient humidity of the target indoor unit into the calculation formula; or, a mapping table between humidity and superheat can be preset, and the result obtained by querying the mapping table with the current first ambient humidity of the target indoor unit can be used as the second evaporation parameter corresponding to the target indoor unit.

[0162] When there is more than one target indoor unit, that is, when there is more than one indoor unit with the preset airflow mode turned on, the second evaporation parameter can be determined based on the first ambient humidity corresponding to each of the more than one target indoor unit; or the second evaporation parameter can be determined based on the first ambient humidity of the target indoor unit with the highest priority among the more than one target indoor unit (e.g., the target indoor unit with people in the corresponding indoor space has a higher priority than the target indoor unit with no people in the corresponding indoor space, or the target indoor unit with a preset type of equipment (e.g., precision equipment) in the corresponding indoor space has a higher priority than other target indoor units, etc.).

[0163] Furthermore, the correspondence between the first ambient humidity and the second evaporation parameter can differ depending on the number of target indoor units. Specifically, more than one preset correspondence between humidity and evaporation parameter can be set in advance, and each preset correspondence can be associated with a different number of units. Based on this, the number of indoor units currently in preset fan mode can be determined, the preset correspondence associated with that number can be obtained, and the second evaporation parameter corresponding to the first ambient humidity can be determined based on the obtained preset correspondence.

[0164] In this embodiment, based on ensuring the cooling effect by using a lower indoor heat exchanger temperature in the first stage, the second evaporation parameter is determined in the second stage by combining the ambient humidity of the space where the indoor unit in the preset fan mode is turned on. This ensures the accuracy of the determined second evaporation parameter, so that the operation of the compressor can match the ambient humidity of the indoor unit in the preset fan mode. By controlling the compressor operation according to the second evaporation parameter, the air outlet temperature of the indoor unit in the preset fan mode is not too low, effectively preventing condensation problems in the indoor unit.

[0165] Furthermore, in this embodiment, the process of obtaining the first ambient humidity is as follows: if the number of target indoor units is more than one, the sub-ambient humidity of the space where each indoor unit with the preset wind sensing mode is turned on is obtained; the first ambient humidity is determined based on the more than one sub-ambient humidity.

[0166] Specifically, the first ambient humidity can be selected from more than one sub-ambient humidity; or it can be obtained by comprehensively calculating the first ambient humidity from more than one sub-ambient humidity.

[0167] In this embodiment, among more than one sub-environmental humidity, the sub-environmental humidity with the largest value is determined as the first environmental humidity. In other embodiments, the average value of more than one sub-environmental humidity may also be used as the first environmental humidity.

[0168] In this embodiment, when more than one indoor unit is in preset fan mode, the second evaporation parameter for controlling compressor operation is determined by considering the sub-humidity of the space where each indoor unit is located. This ensures that the compressor operation guarantees that condensation will not occur in any indoor unit with preset fan mode activated. Specifically, the highest sub-ambient humidity is used as the first ambient humidity to determine the second evaporation parameter, further ensuring that condensation will not occur in any indoor unit with preset fan mode activated, thus guaranteeing the normal operation of the multi-split air conditioner.

[0169] Furthermore, in this embodiment, after step S1, the following steps are also included:

[0170] Step S101: Obtain the number of target indoor units and the continuous running time of the compressor after the preset airflow mode is activated; the target indoor unit is the indoor unit among the at least two indoor units that has the preset airflow mode activated.

[0171] Step S102: Determine whether the number of target indoor units is greater than or equal to the target number and whether the continuous running time is greater than or equal to the preset time.

[0172] When the number of target indoor units is greater than or equal to the target number, and the continuous running time is greater than or equal to the preset time, step S103 is executed;

[0173] Step S103: Determine that the multi-split air conditioner has reached the first preset condition; when the number of target indoor units is less than the target number, or when the continuous running time is less than the preset time, return to step S1.

[0174] The target number here can be a preset number or a number determined based on the total number of indoor units currently on in a multi-split air conditioner. The target number is less than or equal to the total number of indoor units currently on.

[0175] In this embodiment, the total number of indoor units currently in the on state among the at least two indoor units is obtained as the target number. That is, when all the on indoor units are in preset fan mode, the evaporation parameter is increased to make the compressor run at a lower frequency; otherwise, a lower evaporation parameter is maintained to make the compressor run at a higher frequency.

[0176] In this embodiment, when there are enough indoor units with the preset fan mode activated and the compressor runs continuously for a long enough time, the evaporation parameters are increased to reduce the compressor frequency. Otherwise, the evaporation parameters are maintained at a low level so that the compressor runs at a high frequency, thereby avoiding unnecessary frequency reduction of the compressor from affecting the cooling effect of indoor units without the preset fan mode activated.

[0177] Furthermore, this invention also proposes a computer-readable storage medium storing a control program for a multi-split air conditioner. When the control program for the multi-split air conditioner is executed by a processor, it implements the relevant steps of any of the above embodiments of the control method for the multi-split air conditioner.

[0178] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0179] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0180] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, multi-split air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0181] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a multi-split air conditioner, characterized in that, The multi-split air conditioner includes a compressor and at least two indoor units, the compressor being connected to each of the indoor units, and the control method for the multi-split air conditioner includes the following steps: When the multi-split air conditioner is in cooling mode, if the target indoor unit enters the preset air-feed mode, the target electronic expansion valve is operated according to the preset superheat control, and the indoor ambient humidity of the space where the target indoor unit is located is obtained; the target indoor unit is the indoor unit that has the preset air-feed mode turned on among the at least two indoor units, and the air outlet speed of the target indoor unit in the preset air-feed mode is less than the preset air speed. The target superheat of the target indoor unit is determined based on the indoor ambient humidity; wherein, the higher the indoor ambient humidity, the higher the target superheat, and the target superheat is the target value that the temperature difference between the refrigerant outlet temperature and the refrigerant inlet temperature of the indoor heat exchanger in the target indoor unit needs to reach; the preset superheat is less than or equal to the target superheat. When the multi-split air conditioner reaches the first preset condition, the opening of the target electronic expansion valve is adjusted according to the target superheat to make the actual superheat of the indoor heat exchanger in the target indoor unit reach the target superheat. The first preset condition is a pre-set condition that the operating parameters of the air conditioner need to meet when the target indoor unit has a risk of condensation. The larger the target superheat, the smaller the opening of the target electronic expansion valve, which is the electronic expansion valve in the target indoor unit.

2. The control method for a multi-split air conditioner as described in claim 1, characterized in that, The first preset condition includes at least one of the following: The duration during which the target indoor unit operates in the preset fan mode is longer than the preset duration; The evaporation temperature of the target indoor unit is lower than the target evaporation temperature, or the evaporation pressure of the target indoor unit is lower than the target evaporation pressure; The exhaust temperature of the compressor is lower than the preset exhaust temperature; The superheat of the compressor's exhaust is less than the preset superheat of the exhaust.

3. The control method for a multi-split air conditioner as described in claim 2, characterized in that, After the step of obtaining the indoor humidity of the space where the target indoor unit is located, the method further includes: The target evaporation temperature or the target evaporation pressure is determined based on the indoor ambient humidity. The target evaporation temperature or the target evaporation pressure tends to increase with the increase of indoor ambient humidity.

4. The control method for a multi-split air conditioner as described in claim 1, characterized in that, After the step of controlling the opening of the target electronic expansion valve according to the target superheat, the method further includes: When the multi-split air conditioner reaches the second preset condition, the target electronic expansion valve is controlled to operate according to the preset superheat degree, wherein the preset superheat degree is less than or equal to the target superheat degree.

5. The control method for a multi-split air conditioner as described in claim 4, characterized in that, The second preset condition includes at least one of the following: The target indoor unit exits the preset fan mode; The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature; The superheat of the compressor's exhaust is greater than or equal to the preset superheat of the exhaust.

6. The control method for a multi-split air conditioner as described in any one of claims 1 to 5, characterized in that, The step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is performed simultaneously or after the following steps: Obtain the indoor ambient temperature of the space where the target indoor unit is located; When the indoor ambient temperature is less than or equal to a first preset temperature threshold and the indoor ambient humidity is less than or equal to a first preset humidity threshold, the target indoor fan is controlled to run at a speed less than the set speed. When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, the operating speed of the target indoor fan is adjusted according to the indoor ambient temperature and the set temperature of the target indoor unit; Wherein, the target indoor fan is the fan in the target indoor unit, the second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

7. The control method for a multi-split air conditioner as described in any one of claims 1 to 5, characterized in that, The step of obtaining the indoor ambient humidity of the space where the target indoor unit is located is performed simultaneously or after the following steps: Obtain the indoor ambient temperature of the space where the target indoor unit is located; When the indoor ambient temperature is less than or equal to a first preset temperature threshold and the indoor ambient humidity is less than or equal to a first preset humidity threshold, the target air guide plate is controlled to operate in a first air guiding state. When the indoor ambient temperature is greater than the second preset temperature threshold, or when the indoor ambient humidity is greater than the second preset humidity threshold, the target air guide plate is controlled to operate in the second air guiding state. The target air guide plate is located at the air outlet of the target indoor unit. The target air guide plate has multiple air dispersing holes. In the first air guiding state, all the air in the air duct of the target indoor unit enters the room through the air dispersing holes. In the second air guiding state, a gap is formed between the target air guide plate and the air outlet. Part of the air in the air duct of the target indoor unit enters the room through the air dispersing holes, and another part enters the room through the gap. The second preset temperature threshold is greater than or equal to the first preset temperature threshold, and the second preset humidity threshold is greater than or equal to the first preset humidity threshold.

8. A multi-split air conditioner, characterized in that, The multi-split air conditioner includes: At least two indoor units; A compressor, which is connected to each of the indoor units; A control device is provided, wherein the indoor unit and the compressor are both connected to the control device. The control device includes: a memory, a processor, and a control program for a multi-split air conditioner stored in the memory and executable on the processor. When the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for a multi-split air conditioner as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a control program for a multi-split air conditioner, which, when executed by a processor, implements the steps of the control method for a multi-split air conditioner as described in any one of claims 1 to 7.

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