Control method of multi-connected air conditioning system, multi-connected air conditioning system and storage medium

Abstract

The present invention discloses a control method for a multi-connected air conditioning system, a multi-connected air conditioning system, and a storage medium. The method includes: when a target indoor unit in the multi-connected air conditioning system is in a preset state, obtaining the operating state of the outdoor unit of the multi-connected air conditioning system, wherein the preset state includes the electric auxiliary heating module being enabled and the heating mode being disabled; and when the operating state indicates that the outdoor unit is in heating mode, controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening, wherein the target opening is greater than the standby opening of the electronic expansion valve. The present invention aims to improve the operational reliability and heating capacity of the multi-connected air conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method for a multi-connected air conditioning system, a multi-connected air conditioning system, and a storage medium. Background Art

[0002] In a multi-split air-conditioning system, multiple indoor units are generally connected through an outdoor unit, and different indoor units can be operated in corresponding modes according to actual needs.

[0003] Among them, when the electric auxiliary heating module of the indoor unit equipped with electric auxiliary heating is turned on alone, the electric auxiliary heating and the fan are both turned on, and the electronic expansion valve will be opened to a small standby opening. However, when other indoor units are turned on in heating mode, the heating operation of the outdoor unit will cause the system pressure to be too low and refrigerant to accumulate in the indoor unit with electric auxiliary heating, which will not only reduce the reliability of the system operation but also reduce the heating capacity of the air conditioner. Summary of the Invention

[0004] The main purpose of the present invention is to provide a control method for a multi-connected air-conditioning system, a multi-connected air-conditioning system and a storage medium, aiming to improve the operating reliability and heating capacity of the multi-connected air-conditioning system.

[0005] To achieve the above object, the present invention provides a control method for a multi-connected air conditioning system, the control method for the multi-connected air conditioning system comprising the following steps:

[0006] When there is a target indoor unit in a preset state in the multi-connected air-conditioning system, obtaining the operating state of the outdoor unit of the multi-connected air-conditioning system, wherein the preset state includes turning on the electric auxiliary heating module and not turning on the heating mode;

[0007] When the operating state is that the outdoor unit is in heating operation, the electronic expansion valve corresponding to the target indoor unit is controlled to operate at a target opening, and the target opening is greater than a standby opening of the electronic expansion valve.

[0008] Optionally, before the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening, the method further includes:

[0009] When the operating state is that the outdoor unit is in heating operation, obtaining the indoor heat exchanger temperature corresponding to the target indoor unit;

[0010] The target opening degree is determined according to the temperature of the indoor heat exchanger.

[0011] Optionally, the step of determining the target opening degree according to the temperature of the indoor heat exchanger includes:

[0012] Obtaining the operating power of the electric auxiliary heating module and the operating speed of the indoor fan in the target indoor unit;

[0013] determining a target corresponding relationship between the indoor heat exchanger temperature and the target opening degree according to the operating power and the operating speed;

[0014] The target opening degree corresponding to the indoor heat exchanger temperature is determined according to the target corresponding relationship.

[0015] Optionally, the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening includes:

[0016] sending a preset instruction to the outdoor unit so that the outdoor unit controls the electronic expansion valve to operate at the target opening;

[0017] The preset instruction indicates that the indoor unit operates in the heating mode.

[0018] Optionally, when there is a target indoor unit in a preset state in the multi-connected air-conditioning system, after the step of obtaining the operating state of the outdoor unit of the multi-connected air-conditioning system, the method further includes:

[0019] When the operating state is that the outdoor unit is not in heating operation, the electronic expansion valve is controlled to operate at the standby opening degree.

[0020] Optionally, when the operating state is that the outdoor unit is in heating operation, after the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening, the method further includes:

[0021] Obtaining a preset energy demand value corresponding to the target indoor unit and a current energy demand value of an indoor unit in the multi-connected air-conditioning system that is turned on in the heating mode;

[0022] determining a target frequency of a compressor in the multi-connected air conditioning system according to the preset energy demand value and the current energy demand value;

[0023] The compressor is controlled to operate at the target frequency.

[0024] Optionally, the step of obtaining a preset energy demand value corresponding to the target indoor unit includes:

[0025] Obtaining the number of target indoor units in the multi-connected air-conditioning system;

[0026] The preset energy requirement value is determined according to the quantity.

[0027] Optionally, the preset state includes turning on the electric auxiliary heating module, not turning on the heating mode, and the corresponding indoor fan running at a speed greater than a preset speed.

[0028] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a multi-split air-conditioning system, which includes: a memory, a processor, and a control program of the multi-split air-conditioning system stored on the memory and runnable on the processor. When the control program of the multi-split air-conditioning system is executed by the processor, the steps of the control method of the multi-split air-conditioning system as described in any one of the above items are implemented.

[0029] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a multi-split air-conditioning system is stored. When the control program of the multi-split air-conditioning system is executed by a processor, the steps of the control method of the multi-split air-conditioning system as described in any of the above items are implemented.

[0030] The present invention proposes a control method for a multi-connected air-conditioning system. When there is a target indoor unit with an electric auxiliary heating module turned on and a heating mode not turned on, and the outdoor unit is in heating operation, the method controls the electronic expansion valve in the target indoor unit to operate at a target opening larger than the standby opening, thereby avoiding the situation where the system pressure is too low or refrigerant is accumulated when the outdoor unit is in heating operation due to the opening of the target indoor unit being too small, thereby improving the reliability of the system operation and the heating capacity of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the hardware structure involved in the operation of an embodiment of a multi-connected air conditioning system of the present invention;

[0032] Figure 2 This is a flow chart of an embodiment of a method for controlling a multi-connected air-conditioning system according to the present invention;

[0033] Figure 3 A flow chart of another embodiment of a method for controlling a multi-connected air-conditioning system according to the present invention;

[0034] Figure 4 This is a flow chart of another embodiment of a control method for a multi-connected air-conditioning system according to the present invention.

[0035] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] An embodiment of the present invention provides a multi-connected air conditioning system. The multi-connected air conditioning system can be an air conditioning system with switchable heating and cooling functions, or an air conditioning system with only heating function.

[0038] In the embodiment of the present invention, referring to Figure 1The multi-connected air conditioning system includes an outdoor unit 2, at least two indoor units 3, and a control device 1. The at least two indoor units 3 are connected to the outdoor unit 2 via a refrigerant pipeline. The outdoor unit 2 and the at least two indoor units 3 are all connected to the control device 1.

[0039] The outdoor unit 2 includes a compressor, an outdoor heat exchanger and a throttling device. The compressor, the outdoor heat exchanger, the throttling device and at least two indoor heat exchangers are connected in the refrigerant circuit of the multi-connected air-conditioning system.

[0040] At least two indoor units 3 are distributed in different indoor spaces, where the different indoor spaces are independent of each other. Each indoor unit 3 includes an indoor heat exchanger, an electronic expansion valve connected in series with the indoor heat exchanger, and an indoor fan corresponding to the indoor heat exchanger. The indoor heat exchangers in at least two indoor units 3 are connected in parallel. Some or all of the at least two indoor units 3 are equipped with an electric auxiliary heating module. The electric auxiliary heating module, indoor heat exchanger, and indoor fan in each indoor unit 3 are located in the same air outlet duct.

[0041] The operating modes of indoor unit 3 include, but are not limited to, heating mode, cooling mode, electric auxiliary heating mode, and air supply mode. When indoor unit 3 is in heating mode, the indoor heat exchanger is in the condensing state and the indoor fan is on. When indoor unit 3 is in cooling mode, the indoor heat exchanger is in the evaporating state and the indoor fan is on. When indoor unit 3 is in electric auxiliary heating mode, the electric auxiliary heating module is on and the indoor fan is on. When indoor unit 3 is in electric auxiliary heating mode, the indoor fan is on and the electric auxiliary heating module is off. It should be noted that the operating modes of indoor units 3 that are not equipped with an electric auxiliary heating module do not include the electric auxiliary mode.

[0042] When at least two indoor units 3 are in heating mode, the outdoor unit 2 operates in heating mode, during which the compressor is on. When at least two indoor units 3 are in cooling mode, the outdoor unit 2 operates in cooling mode, during which the compressor is on. When at least two indoor units 3 are not in heating mode or cooling mode, the outdoor unit 2 is shut down, during which the compressor is off.

[0043] In the embodiment of the present invention, referring to Figure 1 The control device 1 for a multi-connected air conditioning system includes a processor 1001 (e.g., a CPU), a memory 1002, a timer 1003, and the like. The components of the control device 1 are connected via a communication bus. The memory 1002 can be a high-speed RAM memory or a non-volatile memory such as a disk drive. Alternatively, the memory 1002 can be a storage device independent of the processor 1001.

[0044] The control device 1 may be a single unit or include more than one distributed control unit. The control device 1 may be built into the outdoor unit 2 or the indoor unit 3. If more than one control unit is included, the more than one control unit may be respectively provided in the outdoor unit 2 and different indoor units 3.

[0045] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0046] like Figure 1 As shown, the memory 1002 as a storage medium may include a control program for the multi-connected air conditioning system. Figure 1 In the device shown, the processor 1001 can be used to call the control program of the multi-connected air-conditioning system stored in the memory 1002 and execute the relevant steps of the control method of the multi-connected air-conditioning system in the following embodiments.

[0047] An embodiment of the present invention further provides a control method for a multi-connected air-conditioning system, which is applied to the above-mentioned multi-connected air-conditioning system.

[0048] Reference Figure 2 , an embodiment of a control method for a multi-connected air conditioning system of the present application is proposed. In this embodiment, the control method for the multi-connected air conditioning system includes:

[0049] Step S10: When there is a target indoor unit in a preset state in the multi-connected air-conditioning system, obtaining the operating state of the outdoor unit of the multi-connected air-conditioning system, wherein the preset state includes turning on the electric auxiliary heating module and not turning on the heating mode;

[0050] When the electric auxiliary heating module is turned on, it can be turned on according to the pre-set fixed power. If the heating mode is not turned on, it means that the target indoor unit does not have the capacity requirement of the outdoor unit.

[0051] The operating status specifically indicates whether the outdoor unit is on, and the operating requirements of the indoor unit that must be met when the outdoor unit is on. The operating status includes whether the outdoor unit is in heating operation, cooling operation, or off state, etc.

[0052] When the multi-split air conditioning system is an air conditioning system with a separate heating function, if the compressor in the outdoor unit is turned on, the operating state is that the outdoor unit is in heating operation; if the compressor in the outdoor unit is turned off, the operating state is that the outdoor unit is not in heating operation.

[0053] When the multi-split air-conditioning system is an air-conditioning system with switchable heating and cooling functions, the outdoor unit includes a compressor and a reversing valve. When the compressor in the outdoor unit is turned on and the reversing valve is in the cooling valve position, it can be determined that the operating status of the outdoor unit is in cooling operation; when the compressor in the outdoor unit is turned on and the reversing valve is in the heating valve position, it can be determined that the operating status of the outdoor unit is in heating operation; when the compressor in the outdoor unit is turned off, it can be determined that the operating status of the outdoor unit is not in heating operation or cooling operation.

[0054] Step S20 : ​​When the outdoor unit is in heating operation, the electronic expansion valve corresponding to the target indoor unit is controlled to operate at a target opening, where the target opening is greater than a standby opening of the electronic expansion valve.

[0055] When the outdoor unit is in heating operation, it indicates that among at least two indoor units of the multi-split air-conditioning system, other indoor units other than the target indoor unit are in heating mode. In order to meet the capacity requirements of the indoor unit in heating mode, the outdoor unit operates in heating mode to provide the required heat to the indoor unit.

[0056] In this embodiment, the target opening is a preset fixed opening. In other embodiments, the target opening may also be determined based on the actual operating state of the multi-connected air conditioning system (e.g., the indoor ambient temperature of the target indoor unit, the indoor fan speed of the target indoor unit, the number of indoor units in heating mode, the relationship between the number of indoor units in heating mode and the target number of indoor units, and / or the total energy demand of the indoor units in heating mode, etc.).

[0057] The standby opening is the minimum opening value required when the preset target indoor unit is off and other indoor units are on. Specifically, the standby opening can be less than 20% of the maximum opening of the electronic expansion valve.

[0058] The target opening is smaller than the current opening of the electronic expansion valve in the indoor unit other than the target indoor unit that is turned on in the heating mode.

[0059] An embodiment of the present invention provides a control method for a multi-split air-conditioning system. When there is a target indoor unit with an electric auxiliary heating module turned on and a heating mode not turned on, and the outdoor unit is in heating operation, the method controls the electronic expansion valve in the target indoor unit to operate at a target opening larger than the standby opening, thereby avoiding the situation where the system pressure is too low or refrigerant is accumulated when the outdoor unit is in heating operation due to the opening of the target indoor unit being too small, thereby improving the reliability of the system operation and the heating capacity of the air-conditioning system.

[0060] Furthermore, in this embodiment, the preset state includes turning on the electric auxiliary heating module, not turning on the heating mode, and the operating speed of the corresponding indoor fan being greater than the preset speed.

[0061] The preset speed is specifically greater than or equal to 50% of the maximum operating speed of the indoor fan.

[0062] Specifically, the preset state includes turning on the electric auxiliary heating module, not turning on the heating mode, and the corresponding indoor fan running at the maximum operating speed.

[0063] In this embodiment, when the electric auxiliary heating module is turned on, the high-speed operation of the corresponding indoor fan will lead to a greater risk of refrigerant accumulation in the target indoor unit and a greater risk of low system pressure. Therefore, the electronic expansion valve of the target indoor unit is controlled to operate with a larger target opening, thereby reducing the impact on the heating effect of the indoor unit in the heating mode while improving the reliability of the system operation and the heating capacity of the air-conditioning system.

[0064] Furthermore, in this embodiment, when there is a target indoor unit in a preset state in the multi-connected air-conditioning system, after the step of obtaining the operating state of the outdoor unit of the multi-connected air-conditioning system, the method further includes:

[0065] When the operating state is that the outdoor unit is not in heating operation, the electronic expansion valve is controlled to operate at the standby opening degree.

[0066] In this embodiment, the outdoor unit is not in heating operation, indicating that the system pressure is normal when the electronic expansion valve is operating at the standby opening and the refrigerant will not accumulate in the target indoor unit. Therefore, at this time, the electronic expansion valve in the target indoor unit is controlled to operate at the standby opening, which is beneficial to ensure stable operation of the system while improving the heating effect of the target indoor unit that is currently in heating mode, and improving the comfort of users in the indoor environment where the target indoor unit that is in heating mode is located.

[0067] Furthermore, based on the above embodiment, another embodiment of the control method of the multi-connected air conditioning system of the present application is proposed. In this embodiment, referring to Figure 3 Before the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at the target opening, the method further includes:

[0068] Step S201: When the outdoor unit is in heating operation, obtain the indoor heat exchanger temperature corresponding to the target indoor unit;

[0069] In this embodiment, the temperature of the indoor heat exchanger can be detected by a temperature sensor provided on the coil of the indoor heat exchanger in the target indoor unit.

[0070] Step S202: determining the target opening degree according to the temperature of the indoor heat exchanger.

[0071] Different indoor heat exchanger temperatures correspond to different target openings. Specifically, a correspondence between indoor heat exchanger temperatures and target openings can be pre-established. Based on this correspondence, the target opening corresponding to the current indoor heat exchanger temperature can be determined. For example, if the correspondence is a preset equation, the target opening can be calculated by substituting the indoor heat exchanger temperature into the preset equation. Alternatively, if the correspondence is a mapping table, the matching result obtained by querying the mapping table using the indoor heat exchanger temperature can be used as the target opening.

[0072] In this embodiment, the target opening is determined according to the indoor heat exchanger temperature, which is beneficial to improving the accuracy of the determined target opening and ensuring that when the electronic expansion valve operates at the target opening, the refrigerant will not accumulate in the target indoor unit and the system pressure will not be too low, thereby further improving the reliability of the system operation and the heating capacity of the air-conditioning system.

[0073] Furthermore, in another embodiment, the step of determining the target opening according to the indoor heat exchanger temperature includes: obtaining the operating power of the electric auxiliary heating module and the operating speed of the indoor fan in the target indoor unit; determining a target corresponding relationship between the indoor heat exchanger temperature and the target opening according to the operating power and the operating speed; and determining the target opening corresponding to the indoor heat exchanger temperature according to the target corresponding relationship.

[0074] Specifically, more than one preset corresponding relationship between the temperature of the indoor heat exchanger and the target opening degree may be preset.

[0075] Different operating powers and different operating speeds may correspond to different preset corresponding relationships. Based on this, the preset corresponding relationship corresponding to the operating power and the operating speed may be determined as a target corresponding relationship in more than one preset corresponding relationship. Specifically, the power interval in which the operating power is located and the speed interval in which the operating speed is located may be determined, and the target corresponding relationship in more than one preset corresponding relationship may be determined based on the speed interval and the power interval. Alternatively, a state characteristic value is calculated based on the operating power and the corresponding first weight, the operating speed and the corresponding second weight, and the target corresponding relationship in more than one preset corresponding relationship is determined based on the state characteristic value. The first weight and the second weight may be pre-set fixed values, or may be determined based on the relationship value (such as a ratio or difference, etc.) between the number of indoor units currently turning on the heating mode and the number of target indoor units, and different relationship values ​​correspond to different first weights and second weights.

[0076] In this embodiment, the operating power and operating speed can accurately reflect the risk of refrigerant stockpiling and low system pressure in the target indoor unit when the electric auxiliary heating module is turned on but the heating mode is not turned on. By combining the operating power of the electric auxiliary heating module and the operating speed of the indoor fan, the target opening corresponding to the indoor heat exchanger temperature is determined. Since the accuracy of the target opening is further improved, the reliability of the system operation and the heating capacity of the air-conditioning system are further improved.

[0077] Furthermore, based on any of the above embodiments, another embodiment of the control method of the multi-connected air conditioning system of the present application is proposed. In this embodiment, referring to Figure 4 After the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening when the operating state is that the outdoor unit is in heating operation, the method further includes:

[0078] Step S30, obtaining a preset energy demand value corresponding to the target indoor unit and a current energy demand value of the indoor unit in the multi-connected air-conditioning system that is turned on in the heating mode;

[0079] The preset energy demand value is specifically a capacity demand value required to compensate for the operation of the outdoor unit when the target indoor unit exists in the pre-set multi-connected air-conditioning system and the system operates reliably.

[0080] The current energy demand value of the indoor unit in heating mode can be determined according to the temperature difference between the corresponding indoor ambient temperature and the set temperature.

[0081] Step S40, determining a target frequency of a compressor in the multi-connected air conditioning system according to the preset energy demand value and the current energy demand value;

[0082] Specifically, the sum of all preset energy demand values ​​and all current energy demand values ​​may be determined as the total energy demand, and the target frequency may be determined according to the total energy demand.

[0083] Step S50: controlling the compressor to operate at the target frequency.

[0084] In this embodiment, on the basis of the electronic expansion valve operating at the target opening, even if the target indoor unit does not have a capacity requirement, when regulating the compressor operating frequency, in addition to considering the capacity requirement of the indoor unit in the heating mode, the preset energy demand value is also combined to determine the target frequency, and the operating frequency of the compressor is frequency compensated to ensure that the compressor has sufficient capacity output to avoid the accumulation of refrigerant in the target indoor unit and avoid too low low pressure, thereby improving the system operation reliability and heating capacity, and at the same time ensuring that the heating effect of the heating mode is not affected, thereby ensuring the heating comfort of the corresponding indoor environment.

[0085] Furthermore, the step of obtaining the preset energy demand value corresponding to the target indoor unit includes: obtaining the number of target indoor units in the multi-connected air conditioning system; and determining the preset energy demand value based on the number. Different numbers correspond to different preset energy demand values, and each target indoor unit has the same preset energy demand value. When there is more than one target indoor unit, the target frequency is determined based on the sum of all preset energy demand values ​​and the sum of the current energy demand values ​​of all indoor units in heating mode.

[0086] In this embodiment, the preset energy demand value is determined based on the number of target indoor units to ensure that the output capacity of the compressor can be accurately matched with the actual status of the target indoor units in the air-conditioning system, thereby further improving the reliability of the system operation and the heating capacity of the air-conditioning system through the coordinated adjustment of the compressor and the electronic expansion valve.

[0087] Furthermore, based on any of the above embodiments, another embodiment of the control method of the multi-split air conditioning system of the present application is proposed. In this embodiment, the control device may be built into the indoor unit, and the execution subject of the control method of the multi-split air conditioning system is the indoor unit. The step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at the target opening includes:

[0088] sending a preset instruction to the outdoor unit so that the outdoor unit controls the electronic expansion valve to operate at the target opening;

[0089] The preset instruction indicates that the indoor unit operates in the heating mode.

[0090] Furthermore, after receiving the preset instruction, the outdoor unit may determine the target frequency and control the compressor to operate at the target frequency in the manner mentioned in the above embodiment.

[0091] In this embodiment, the existing air-conditioning system will not send a preset instruction to the outdoor unit when the indoor unit is not in heating mode. When the outdoor unit does not receive the preset instruction from the indoor unit, it determines that the corresponding indoor unit does not have the capacity requirement. The outdoor unit will not consider the energy demand of the indoor unit when adjusting the compressor frequency, and will control the electronic expansion valve of the indoor unit according to the standby opening when adjusting the electronic expansion valve of the indoor unit. However, this embodiment still sends a preset instruction to the outdoor unit when the target indoor unit is not in heating mode, thereby ensuring that the outdoor unit can increase the output capacity of the target indoor unit when the target indoor unit exists, so as to prevent the low pressure from being too low and the refrigerant from accumulating in the target indoor unit, thereby further improving the reliability of the system operation and the heating capacity of the air-conditioning system.

[0092] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for a multi-split air-conditioning system is stored. When the control program for the multi-split air-conditioning system is executed by a processor, the relevant steps of any embodiment of the control method for a multi-split air-conditioning system are implemented.

[0093] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0094] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0095] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course, by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, multi-connected air conditioning system, or network equipment, etc.) to execute the methods described in each embodiment of the present invention.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a multi-connected air conditioning system, characterized in that: The control method of the multi-connected air conditioning system comprises the following steps: When there is a target indoor unit in a preset state in the multi-connected air-conditioning system, obtaining the operating state of the outdoor unit of the multi-connected air-conditioning system, wherein the preset state includes that the electric auxiliary heating module is turned on, the heating mode is not turned on, and the operating speed of the corresponding indoor fan is greater than a preset speed, and the preset speed is greater than or equal to 50% of the maximum operating speed of the indoor fan; When the operating state is that the outdoor unit is in heating operation, obtaining the indoor heat exchanger temperature corresponding to the target indoor unit, obtaining the operating power of the electric auxiliary heating module and the operating speed of the indoor fan in the target indoor unit; determining a target corresponding relationship between the indoor heat exchanger temperature and the target opening degree according to the operating power and the operating speed; Determining a target opening corresponding to the indoor heat exchanger temperature according to the target corresponding relationship; The electronic expansion valve corresponding to the target indoor unit is controlled to operate at a target opening, where the target opening is greater than a standby opening of the electronic expansion valve.

2. The control method of the multi-connected air conditioning system according to claim 1, wherein: The step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening degree includes: sending a preset instruction to the outdoor unit so that the outdoor unit controls the electronic expansion valve to operate at the target opening; The preset instruction indicates that the indoor unit operates in the heating mode.

3. The control method of the multi-connected air conditioning system according to claim 1, wherein: After the step of obtaining the operating status of the outdoor unit of the multi-connected air-conditioning system when there is a target indoor unit in a preset state in the multi-connected air-conditioning system, the method further includes: When the operating state is that the outdoor unit is not in heating operation, the electronic expansion valve is controlled to operate at the standby opening degree.

4. The control method of a multi-connected air conditioning system according to any one of claims 1 to 3, characterized in that: After the step of controlling the electronic expansion valve corresponding to the target indoor unit to operate at a target opening, the method further includes: Obtaining a preset energy demand value corresponding to the target indoor unit and a current energy demand value of an indoor unit in the multi-connected air-conditioning system that is turned on in the heating mode; determining a target frequency of a compressor in the multi-connected air conditioning system according to the preset energy demand value and the current energy demand value; The compressor is controlled to operate at the target frequency.

5. The control method of the multi-connected air conditioning system according to claim 4, characterized in that: The step of obtaining the preset energy demand value corresponding to the target indoor unit includes: Obtaining the number of target indoor units in the multi-connected air-conditioning system; The preset energy demand value is determined according to the quantity.

6. A multi-connected air conditioning system, characterized in that: The multi-connected air-conditioning system includes: a memory, a processor, and a control program of the multi-connected air-conditioning system stored in the memory and runnable on the processor. When the control program of the multi-connected air-conditioning system is executed by the processor, the steps of the control method of the multi-connected air-conditioning system as described in any one of claims 1 to 5 are implemented.

7. A storage medium, characterized in that: The storage medium stores a control program for a multi-connected air-conditioning system, and when the control program for the multi-connected air-conditioning system is executed by the processor, the steps of the control method for the multi-connected air-conditioning system according to any one of claims 1 to 5 are implemented.

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