Multi-split air conditioning system control method, system, apparatus, device, and storage medium

Abstract

Disclosed are a multi-split air conditioning system control method, a system, an apparatus, a device, and a storage medium. A multi-split air conditioning system comprises a liquid storage tank (301). The method comprises: controlling the liquid storage tank to execute a refrigerant storage action ; when the execution of the refrigerant storage action is completed and the operation of the system is stable, acquiring the current energy efficiency change condition of the system; and, on the basis of the energy efficiency change condition, controlling the liquid storage tank (301) to execute the refrigerant storage action, or, on the basis of the energy efficiency change condition, controlling the liquid storage tank (301) to execute a refrigerant discharge action.

Description

Multi-split system control methods, systems, devices, equipment and storage media

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on December 20, 2024, with application number 202411892081.0, entitled "Multi-unit system control method, system, apparatus, device and storage medium", the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present invention relate to the field of multi-split air conditioning system technology, and in particular to a multi-split air conditioning system control method, device, equipment and storage medium. Background Technology

[0004] Existing multi-split air conditioning systems commonly face the problem of insufficient refrigerant flow regulation. Multi-split systems connect multiple indoor units and one or more outdoor units, with refrigerant circulating among these devices. Traditional multi-split systems typically rely on a fixed refrigerant flow rate to maintain system operation. However, due to variations in ambient temperature, load fluctuations, and different operating conditions, a fixed refrigerant flow rate cannot meet the optimal needs under different circumstances. This lack of flexible refrigerant flow adjustment leads to the system operating under uneven loads and insufficient energy efficiency, thus affecting the overall system efficiency and energy-saving performance.

[0005] While some refrigerant flow adjustment schemes exist in the current technology, they often cannot dynamically adjust the refrigerant volume based on real-time energy efficiency and system load changes. Therefore, how to optimize the energy efficiency of multi-split systems has become an urgent problem to be solved. Summary of the Invention

[0006] In view of this, in order to solve the above-mentioned technical problems of optimizing the energy efficiency of multi-split air conditioning systems, embodiments of the present invention provide a multi-split air conditioning system control method, device, equipment and storage medium.

[0007] In a first aspect, embodiments of the present invention provide a control method for a multi-split air conditioning system, the multi-split air conditioning system including a refrigerant storage tank, the method comprising: controlling the refrigerant storage tank of the system to perform a refrigerant storage action; when the refrigerant storage action is completed and the system is operating stably, acquiring the current energy efficiency change of the system; controlling the refrigerant storage tank to perform a refrigerant storage action according to the energy efficiency change, or controlling the refrigerant discharge action according to the energy efficiency change, so as to maximize the energy efficiency.

[0008] In one possible implementation, controlling the liquid storage tank of the system to perform refrigerant storage actions includes: controlling the liquid inlet valve and the gas balance valve of the liquid storage tank to open, and controlling the liquid drain valve of the liquid storage tank to close, wherein the gas balance valve is used to control the discharge of gaseous refrigerant in the liquid storage tank, and the liquid drain valve is used to control the discharge of liquid refrigerant in the liquid storage tank; after a first time interval, controlling the liquid inlet valve and the gas balance valve to close.

[0009] In one possible implementation, obtaining the current energy efficiency change of the system includes: obtaining a first energy efficiency before performing the refrigerant storage action, and obtaining a second energy efficiency after the system has stabilized; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0010] In one possible implementation, controlling the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change includes, when the energy efficiency change indicates no improvement, performing the following steps: controlling the liquid storage tank to perform a refrigerant discharge action, wherein the refrigerant discharge action is: controlling the drain valve to open; after the refrigerant discharge action is completed and the system is operating stably, acquiring the current energy efficiency change of the system again; when the acquired energy efficiency change indicates an improvement, returning to the refrigerant discharge action; when the acquired energy efficiency change indicates no improvement, controlling the liquid storage tank to perform a refrigerant storage action.

[0011] In one possible implementation, controlling the liquid storage tank to perform refrigerant storage based on the energy efficiency change includes the following steps when the energy efficiency change indicates an improvement: controlling the liquid storage tank to perform refrigerant storage again; after the refrigerant storage is completed and the system is running stably, acquiring the current energy efficiency change of the system again; if the acquired energy efficiency change indicates an improvement, returning to controlling the liquid storage tank to perform refrigerant storage again; and if the acquired energy efficiency change indicates no improvement, controlling the liquid storage tank to perform refrigerant discharge.

[0012] In one possible implementation, controlling the liquid storage tank to perform refrigerant storage based on the energy efficiency change includes the following steps when the energy efficiency change indicates an improvement in energy efficiency and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference: controlling the liquid storage tank to perform refrigerant storage again; after the refrigerant storage is completed and the system is running stably, acquiring the current energy efficiency change of the system again; when the acquired energy efficiency change indicates an improvement in energy efficiency, returning to controlling the liquid storage tank to perform refrigerant storage again; and when the acquired energy efficiency change indicates no improvement in energy efficiency, controlling the liquid storage tank to perform refrigerant discharge.

[0013] In one possible implementation, the method further includes ending control when the energy efficiency change is an improvement in energy efficiency and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference.

[0014] In one possible implementation, controlling the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change includes the following steps when the energy efficiency change indicates no improvement: controlling the liquid storage tank to perform a refrigerant discharge action, wherein the refrigerant discharge action is controlling the drain valve to open; after the refrigerant storage action is completed, when the system is running stably, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, controlling the liquid storage tank to perform a refrigerant discharge action again, and re-obtaining the current energy efficiency change of the system; when the re-obtained energy efficiency change indicates an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, returning to the steps of controlling the liquid storage tank to perform a refrigerant storage action again and re-obtaining the current energy efficiency change of the system; when the re-obtained energy efficiency change indicates no improvement in energy efficiency, controlling the liquid storage tank to perform a refrigerant discharge action.

[0015] In one possible implementation, controlling the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change includes, when the energy efficiency change is no improvement, the following steps are performed: controlling the liquid storage tank to perform a refrigerant discharge action, wherein the refrigerant discharge action is controlling the drain valve to open; and when the system is running stably, and the energy efficiency change after performing the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control is terminated.

[0016] In one possible implementation, corresponding to the refrigerant discharge action, the energy efficiency change of the current system is obtained, including: obtaining the first energy efficiency before the refrigerant discharge action is performed, and obtaining the second energy efficiency after the system is running stably; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0017] In one possible implementation, determining whether the system is operating stably includes: acquiring the system's energy efficiency at predetermined intervals; and determining the system's steady state when the system's energy efficiency remains stable.

[0018] Secondly, embodiments of the present invention provide a multi-unit system for implementing the method described in any of the above embodiments, comprising: a liquid storage tank, the liquid storage tank including an inlet valve, a gas balance valve and a drain valve.

[0019] The first end of the liquid storage tank is connected to one end of the liquid inlet valve, the second end of the liquid storage tank is connected to one end of the gas balance valve, and the third end of the liquid storage tank is connected to one end of the liquid outlet valve.

[0020] The other end of the inlet valve is connected to the liquid-side main pipe on the medium-pressure side, and the inlet valve is used to control the flow of refrigerant into the storage tank.

[0021] The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side.

[0022] The gas balance valve is used to control the discharge of gaseous refrigerant from the storage tank, and the drain valve is used to control the discharge of liquid refrigerant from the storage tank.

[0023] Thirdly, embodiments of the present invention provide a control device for a multi-unit air conditioning system, wherein the multi-unit air conditioning system includes a liquid storage tank, and the control device includes a control module and an acquisition module.

[0024] The control module is used to control the liquid storage tank to perform the refrigerant storage action.

[0025] The acquisition module is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably.

[0026] The control module is also used to control the liquid storage tank to perform a refrigerant storage action based on the energy efficiency change, or to control the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change.

[0027] Fourthly, embodiments of the present invention provide a computer device, including: a processor and a memory, wherein the processor is configured to execute a multi-system control program stored in the memory to implement the multi-system control method described in any one of the first aspects above.

[0028] Fifthly, embodiments of the present invention provide a storage medium storing one or more programs, which are executed by one or more processors to implement the multi-unit system control method described in any one of the first aspects.

[0029] The multi-split air conditioning system control scheme provided in this invention controls the system's refrigerant storage tank to perform a refrigerant storage action. After the refrigerant storage action is completed and the system is operating stably, the system's energy efficiency changes are acquired. Based on these energy efficiency changes, the system controls the refrigerant storage tank to either store or discharge refrigerant, thereby maximizing energy efficiency. Thus, by controlling the system to store or discharge refrigerant based on energy efficiency changes, the amount of refrigerant in the storage tank can be adjusted to optimize system energy efficiency, thereby improving the overall energy efficiency of the multi-split air conditioning system. Attached Figure Description

[0030] Figure 1 is a schematic diagram of a multi-unit air conditioning system provided in an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of the refrigerant storage flow path of a multi-split air conditioning system according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of the refrigerant discharge flow path of a multi-split air conditioning system according to an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the cooling flow path of a multi-split air conditioning system provided in an embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of the heating flow path of a multi-split air conditioning system provided in an embodiment of the present invention;

[0035] Figure 6 is a flowchart illustrating a multi-unit system control method provided in an embodiment of the present invention;

[0036] Figure 7 is a flowchart illustrating another multi-unit system control method provided in an embodiment of the present invention;

[0037] Figure 8 is a schematic diagram of the first type of energy efficiency change provided by an embodiment of the present invention;

[0038] Figure 9 is a schematic diagram of the second type of energy efficiency change provided by an embodiment of the present invention;

[0039] Figure 10 is a flowchart illustrating another multi-unit system control method provided in an embodiment of the present invention;

[0040] Figure 11 is a schematic diagram of the third type of energy efficiency change provided in the embodiment of the present invention;

[0041] Figure 12 is a schematic diagram of the fourth type of energy efficiency change provided in the embodiment of the present invention;

[0042] Figure 13 is a schematic diagram of the structure of a multi-unit system control device provided in an embodiment of the present invention;

[0043] Figure 14 is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0046] Figure 1 is a schematic diagram of a multi-unit system provided in an embodiment of the present invention. As shown in Figure 1, the system specifically includes a liquid storage tank 301.

[0047] The liquid storage tank 301 is equipped with an inlet valve 302, a gas balance valve 303 and a drain valve 304.

[0048] One end of the top of the liquid storage tank 301 is connected to one end of the liquid inlet valve 302, the other end of the top of the liquid storage tank 301 is connected to one end of the gas balance valve 303, and one end of the bottom of the liquid storage tank 301 is connected to one end of the liquid drain valve 304.

[0049] The other end of the inlet valve 302 is connected to the liquid side main pipe on the medium pressure side. The inlet valve 302 is used to control the flow of refrigerant into the storage tank.

[0050] The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side.

[0051] The gas balance valve is used to control the discharge of gaseous refrigerant from the storage tank, while the drain valve is used to control the discharge of liquid refrigerant from the storage tank.

[0052] In this embodiment, as shown in Figure 1, the multi-split air conditioning system further includes: a compressor 101, a four-way valve 102, an outdoor heat exchanger 103, an upper heating expansion valve 104, a lower heating expansion valve 105, a gas-liquid separator 106, a first pipeline 201, a second pipeline 202, a third pipeline 203, a fourth pipeline 204, a liquid-side main pipe 205, a gas-side main pipe 206, and an unloading valve 305.

[0053] The liquid storage tank 301 is connected to the liquid-side main pipe 205 via the inlet valve 302, and to the third pipe 203 via the gas balance valve 303 and the drain valve 304. Since the liquid-side main pipe 205 is on the medium-pressure side in both cooling and heating modes, while the third pipe 203 is always on the low-pressure side, the liquid inlet side of the storage tank has a medium-pressure pressure, and the drain side has a low-pressure pressure. The two can always maintain a certain pressure difference to ensure sufficient liquid inlet and outlet power.

[0054] The inlet valve 302 and related piping are connected to the top of the liquid storage tank 301. When the inlet valve 302 is opened, the refrigerant enters from the top of the liquid storage tank 301 with minimal resistance. After entering, the refrigerant separates into gas and liquid phases, with the upper part being gaseous and the lower part being liquid.

[0055] The related piping of the gas balance valve 303 is also connected to the top of the liquid storage tank 301. During the liquid filling process, if the gas balance valve 303 is closed, the pressure in the liquid storage tank will gradually increase as the liquid filling process proceeds, making it difficult for refrigerant to enter the liquid storage tank. At this time, if the gas balance valve 303 is opened, the gaseous refrigerant at the top of the liquid storage tank is connected to the low-pressure side. Excess gaseous refrigerant flows to the low-pressure side under the action of pressure difference, thereby reducing the pressure in the liquid storage tank and maintaining the liquid filling power. Furthermore, since the liquid filling volume is always much greater than the gaseous refrigerant outflow through the gas balance valve 303, it is still in the state of refrigerant filling at this time.

[0056] The drain valve 304 and related pipelines are connected to the bottom of the storage tank. When the drain valve 304 is opened, the liquid refrigerant is discharged from the storage tank under the pressure difference between the storage tank pressure and the low pressure.

[0057] Therefore, the control methods for the liquid storage tank during refrigerant storage and refrigerant discharge are as follows:

[0058] Figure 2 is a schematic diagram of the refrigerant storage operation flow of a multi-split air conditioning system according to an embodiment of the present invention, and Figure 3 is a schematic diagram of the refrigerant discharge operation flow of a multi-split air conditioning system according to an embodiment of the present invention. As shown in Figure 2, the refrigerant storage operation of the liquid storage tank is as follows: simultaneously opening the inlet valve 302 and the gas balance valve 303, and closing the drain valve 304, so that the refrigerant flows into the liquid storage tank through the inlet valve, and simultaneously discharging the gaseous refrigerant through the gas balance valve, closing after time t1; as shown in Figure 3, the refrigerant discharge operation of the liquid storage tank is as follows: opening the drain valve to discharge the refrigerant from the drain valve, closing after time t2. t1 and t2 are preset operation time parameters of the system.

[0059] In one possible implementation, Figure 4 is a schematic diagram of the cooling flow path of a multi-split system provided by an embodiment of the present invention, and Figure 5 is a schematic diagram of the heating flow path of a multi-split system provided by an embodiment of the present invention.

[0060] The refrigeration flow path in Figure 4 is as follows: the refrigerant discharged from the compressor 101 enters the second pipeline 202 through the four-way valve 102, and after condensation in the outdoor heat exchanger 103, it enters the indoor side for evaporation and refrigeration through the liquid-side main pipe 205. The refrigerated refrigerant returns to the outdoor side through the gas-side main pipe 206, and then returns to the gas-liquid separator 106 and the compressor 101 through the four-way valve 102.

[0061] The heating flow path in Figure 5 is as follows: the refrigerant discharged from the compressor 101 enters the indoor side for condensation and heating via the four-way valve 102 and the gas-side main pipe 206. After heating, the refrigerant returns to the outdoor side via the liquid-side main pipe 205, evaporates in the outdoor heat exchanger 103, and then returns to the gas-liquid separator 106 and the compressor 101 via the four-way valve 102.

[0062] In both the refrigeration and heating flow paths, the liquid inlet side (liquid inlet valve 302 and its pipeline) of the liquid storage tank 301 is connected to the liquid side main pipe 205 and is always under medium pressure. The gas balance side (gas balance valve 303 and its pipeline) and the liquid discharge side (liquid discharge valve 304 and its pipeline) of the liquid storage tank 301 are connected to the third pipeline 203 and are always under low pressure.

[0063] The multi-split air conditioning system provided in this invention can maintain a certain pressure difference between the inlet and outlet sides of the liquid storage tank by setting the inlet side to have medium pressure and the outlet side to have low pressure, ensuring sufficient inlet and outlet power. At the same time, a gas balance valve with low pressure is set at the top of the liquid storage tank to discharge the gaseous refrigerant in the upper part of the liquid storage tank through the gas pressure difference, thereby reducing the pressure of the liquid storage tank and maintaining the inlet power. This ensures that the multi-split air conditioning system can flexibly adjust the amount of refrigerant in the liquid storage tank and ensures smooth operation during refrigerant inlet and outlet.

[0064] Figure 6 is a flowchart illustrating a multi-unit system control method according to an embodiment of the present invention. As shown in Figure 6, the method specifically includes steps S11 to S13.

[0065] S11, Control the liquid storage tank to perform the action of storing refrigerant.

[0066] S12. After the refrigerant storage action is completed and the system is running stably, obtain the current energy efficiency change of the system.

[0067] S13. Control the liquid storage tank to perform refrigerant storage action according to the energy efficiency change, or control the liquid storage tank to perform refrigerant discharge action according to the energy efficiency change, so as to achieve the highest energy efficiency.

[0068] The multi-split air conditioning system control method provided in this embodiment of the invention is applied to the multi-split air conditioning system shown in Figure 1. Specifically, by controlling the changes in energy efficiency, the system performs refrigerant storage or refrigerant discharge actions, thereby adjusting the amount of refrigerant in the liquid storage tank through changes in energy efficiency to achieve optimal system energy efficiency.

[0069] In this embodiment, after the system is powered on, the system's liquid storage tank needs to perform a refrigerant storage operation. This includes: opening the inlet valve and the gas balance valve at the top of the liquid storage tank, and closing the drain valve at the bottom of the tank, allowing refrigerant to flow into the tank through the inlet valve. The gas balance valve controls the discharge of gaseous refrigerant from the tank, and the drain valve controls the discharge of liquid refrigerant. After a preset first time interval, the inlet valve and the gas balance valve are closed, completing the refrigerant storage operation.

[0070] Furthermore, to determine if the system is operating stably, a fixed waiting time is set. That is, after the refrigerant storage process ends and a fixed interval has elapsed, the system is considered to have reached a new steady state, and then the system's energy efficiency is observed. Alternatively, a new steady state can be determined when system parameters no longer change; for example, parameters such as high pressure, low pressure, compressor frequency, and indoor unit expansion valve opening no longer change. Or, a new steady state can be determined when the system's energy efficiency no longer changes.

[0071] In one embodiment, determining whether the system is operating stably includes: acquiring the system's energy efficiency at predetermined intervals; and determining the system's steady state when the system's energy efficiency remains stable.

[0072] Furthermore, the system's energy efficiency is obtained by dividing the system's current cooling / heating capacity by the system's current power.

[0073] When the system is running stably, the energy efficiency changes of the current system are obtained, including: obtaining the first energy efficiency before the refrigerant storage action is performed, and obtaining the second energy efficiency after the system is running stably; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0074] If the action performed is to discharge refrigerant, the energy efficiency change of the current system is obtained, including: obtaining the first energy efficiency before the action of discharging refrigerant, and obtaining the second energy efficiency after the system is running stably; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0075] Furthermore, based on changes in energy efficiency, the refrigerant storage or discharge actions of the liquid storage tank are dynamically adjusted. If the current energy efficiency improves, the currently completed action is repeated; if the current energy efficiency does not improve, the opposite action is performed. For example, if the refrigerant storage action is completed and the energy efficiency improves, the refrigerant storage action is repeated; if the energy efficiency does not improve, the refrigerant discharge action is performed. Therefore, this energy efficiency-based adjustment mechanism can automatically control the refrigerant storage or discharge operations of the liquid storage tank. Through this dynamic adjustment mechanism, the system can adapt to changes in environment and load, achieving optimal matching between refrigerant quantity and energy efficiency, and avoiding performance impacts caused by excessive or insufficient refrigerant.

[0076] In one possible implementation, Figure 7 shows a flowchart of another multi-split air conditioning system control method provided by an embodiment of the present invention. This method, which controls the liquid storage tank to perform a refrigerant storage action based on energy efficiency changes, includes the following steps when the energy efficiency change indicates an improvement: controlling the liquid storage tank to perform the refrigerant storage action again; after the refrigerant storage action is completed and the system is running stably, acquiring the current energy efficiency change of the system again; if the acquired energy efficiency change indicates an improvement, returning to controlling the liquid storage tank to perform the refrigerant storage action again; and if the acquired energy efficiency change indicates no improvement, controlling the liquid storage tank to perform a refrigerant discharge action and ending the control.

[0077] In one embodiment of this application, as shown in FIG7, the multi-split air conditioning system control method controls the liquid storage tank to perform a refrigerant discharge action based on energy efficiency changes. This includes the following steps when the energy efficiency change indicates no improvement: performing a refrigerant discharge action, which involves opening the drain valve; after the refrigerant discharge action is completed and the system is running stably, re-acquiring the current system energy efficiency change; if the re-acquired energy efficiency change indicates an improvement, returning to the refrigerant discharge action; and if the re-acquired energy efficiency change indicates no improvement, controlling the liquid storage tank to perform a refrigerant storage action and then ending the control.

[0078] In this embodiment, 1. Perform the refrigerant storage action (S101), wait for the system to stabilize (S102), observe the system energy efficiency (φ), and obtain the energy efficiency change (S103).

[0079] 2. If the system energy efficiency is improved, the refrigerant storage action is performed (S104); if the system energy efficiency is not improved, the refrigerant discharge action is performed (S105).

[0080] Among them, "whether the energy efficiency has been improved" refers to whether the system energy efficiency obtained after the refrigerant storage operation is completed and the system is stable is improved compared with the energy efficiency before the refrigerant storage operation.

[0081] If the system's energy efficiency improves, it means that storing refrigerant helps improve energy efficiency, but the energy efficiency has not yet reached its optimal level. Therefore, we should continue to try storing refrigerant to observe whether it can further improve energy efficiency.

[0082] If the system energy efficiency is not improved, it means that storing refrigerant will lead to a decrease in system energy efficiency and the system is in a state of insufficient refrigerant circulation. The liquid tank should discharge refrigerant to increase the refrigerant circulation. Therefore, the process enters S105 to perform the refrigerant discharge action.

[0083] 3. After entering S104 from S103, wait for the system to stabilize again (S106) and observe whether the system energy efficiency is improved (S107). If the energy efficiency is improved, return to S104 and execute the next judgment and action cycle. If the energy efficiency is not improved, execute a refrigerant discharge action (S108) and exit control (S112).

[0084] If energy efficiency is improved, it means that there is still room for improvement in energy efficiency. Therefore, return to S104 to make judgments and take actions in the next cycle.

[0085] If energy efficiency is not improved, it indicates that too much refrigerant was stored after this refrigerant storage, and the system was already in its optimal operating state before this refrigerant storage. Therefore, a refrigerant discharge action is performed to restore the refrigerant state to the state before this action, so that the energy efficiency returns to the optimal state before this action.

[0086] Thus, the first type of energy efficiency change is shown in Figure 8. After the first refrigerant storage action, the energy efficiency increases. After the second refrigerant storage action, the energy efficiency increases. Therefore, the third refrigerant storage action is performed. After the third action, the energy efficiency decreases. Then, the refrigerant discharge action is performed again to restore the energy efficiency to the optimal level before the control ends.

[0087] 4. After entering S105 from S103, wait for the system to stabilize again (S109) and observe whether the system energy efficiency is improved (S110). If the energy efficiency is improved, return to S105 and execute the next judgment and action cycle. If the energy efficiency is not improved, execute a refrigerant storage action (S111) and exit control (S112).

[0088] If energy efficiency is improved, it means that there is still room for improvement in energy efficiency. Therefore, return to S205 to make judgments and take actions in the next cycle.

[0089] If the energy efficiency is not improved, it means that there is too much refrigerant circulating in the system after this refrigerant discharge, and the optimal energy efficiency cannot be achieved. Therefore, a refrigerant storage action is performed to restore the refrigerant state to the state before this action, so that the energy efficiency returns to the optimal state before this action.

[0090] Thus, the second type of energy efficiency change diagram is shown in Figure 9. After the first refrigerant storage action, the energy efficiency decreases, indicating that a refrigerant discharge action is needed to improve the energy efficiency. After the first refrigerant discharge action, the energy efficiency increases, so the second refrigerant discharge action is performed. After the second action, the energy efficiency increases, so the third refrigerant discharge action is performed. After the third action, the energy efficiency decreases, and the refrigerant storage action is performed again to restore the energy efficiency to the optimal level before the control ends.

[0091] In one possible implementation, Figure 10 shows a flowchart of another multi-split air conditioning system control method provided by an embodiment of the present invention. The step of controlling the liquid storage tank to perform a refrigerant storage action based on the energy efficiency change includes the following steps: when the energy efficiency change (after the first refrigerant storage action) indicates an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the following steps are performed: controlling the liquid storage tank to perform the refrigerant storage action again; after the refrigerant storage action is completed and the system is running stably, acquiring the current energy efficiency change of the system again; when the acquired energy efficiency change indicates an improvement in energy efficiency, returning to the previous step of controlling the liquid storage tank to perform the refrigerant storage action again; when the acquired energy efficiency change indicates no improvement in energy efficiency, controlling the liquid storage tank to perform a refrigerant discharge action.

[0092] In one embodiment of this application, as shown in FIG10, the multi-split air conditioning system control method further includes ending control when the energy efficiency change (after the first execution of the refrigerant storage action) is an energy efficiency improvement, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference.

[0093] In one embodiment of this application, as shown in FIG10, the method of controlling the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change includes the following steps when the energy efficiency change (after the first execution of the refrigerant storage action) is that the energy efficiency has not improved: controlling the liquid storage tank to perform a refrigerant discharge action, the refrigerant discharge action being to control the drain valve to open; when the refrigerant storage action is completed, when the system is running stably, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, controlling the liquid storage tank to perform a refrigerant discharge action again, and re-executing the acquisition of the current energy efficiency change of the system; when the energy efficiency change obtained again is that the energy efficiency has improved, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, returning to the steps of controlling the liquid storage tank to perform a refrigerant storage action again and re-executing the acquisition of the current energy efficiency change of the system; when the energy efficiency change obtained again is that the energy efficiency has not improved, controlling the liquid storage tank to perform a refrigerant discharge action.

[0094] In one embodiment of this application, as shown in FIG10, the method of controlling the liquid storage tank to perform a refrigerant discharge action according to the energy efficiency change includes, when the energy efficiency change is that the energy efficiency has not improved, performing the following steps: controlling the liquid storage tank to perform a refrigerant discharge action, wherein the refrigerant discharge action is controlling the drain valve to open; when the system is running stably, when the energy efficiency change after performing the refrigerant discharge action is that the energy efficiency has improved, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0095] In this embodiment, 1. Perform the refrigerant storage action (S201), wait for the system to stabilize (S202), and then observe the changes in system energy efficiency (S203).

[0096] 2. If the system energy efficiency is not improved, the refrigerant discharge action is performed (S204). If the system energy efficiency is improved, the difference between the first energy efficiency and the second energy efficiency is taken as the energy efficiency improvement value Δφ, and the energy efficiency improvement value Δφ is compared with the preset difference φa (S205).

[0097] "Preset difference φa" is a system preset value used to determine whether the energy efficiency improvement is significant. A threshold can also be set based on the energy efficiency improvement ratio. In this case, when the energy efficiency improvement ratio, that is, the change ratio of the energy efficiency after the refrigerant storage action to the energy efficiency before the action, is greater than the threshold φa, the energy efficiency improvement is considered significant.

[0098] 3. After entering S205, if the energy efficiency improvement value Δφ>φa, then execute the refrigerant storage action (S206) and wait for the system to stabilize again (S207). If the energy efficiency improvement value Δφ≤φa, it means that the system energy efficiency improvement has approached the maximum value and no further adjustment is needed. Exit control (S216).

[0099] 4. After entering S207, observe whether the system energy efficiency has improved after the system stabilizes (S208). If the energy efficiency has improved, return to S205 and execute the next judgment and action cycle. If the energy efficiency has not improved, execute a refrigerant discharge action (S209) and exit control (S216).

[0100] Thus, the third energy efficiency change scenario is illustrated in Figure 11. After the first refrigerant storage action is completed, energy efficiency improves. After the system stabilizes, if the energy efficiency improvement is found to be greater than φa, a second refrigerant storage action is executed. After the second refrigerant storage action is completed, energy efficiency improves. After the system stabilizes, if the energy efficiency improvement is found to be greater than φa, a third refrigerant storage action is executed. After the third refrigerant storage action is completed, energy efficiency improves. After the system stabilizes, if the energy efficiency improvement is found to be less than φa, it is considered that the system energy efficiency improvement has approached its maximum value, and control is terminated.

[0101] The diagram shown in Figure 12 illustrates the fourth type of energy efficiency change. After the first refrigerant storage action is completed, the energy efficiency improves. After the system stabilizes, if the energy efficiency improvement value is found to be greater than φa, a second refrigerant storage action is performed. After the second refrigerant storage action is completed, the energy efficiency improves again. After the system stabilizes, if the energy efficiency decreases, a refrigerant discharge action is performed, and control is deactivated.

[0102] 5. After proceeding from step S203 to step S204 to perform the refrigerant discharge action, wait for the system to stabilize (S210), and then compare the energy efficiency improvement value Δφ with the preset difference φa (S211). If the energy efficiency improvement value Δφ > φa, then perform the refrigerant discharge action (S212) and wait for the system to stabilize (S213). If the energy efficiency improvement value Δφ ≤ φa, it indicates that the system energy efficiency improvement has approached its maximum value, no further adjustment is needed, and control is exited (S216).

[0103] 6. After entering S213, observe whether the system energy efficiency has improved after the system stabilizes (S214). If the energy efficiency has improved, return to S211 and execute the next judgment and action cycle. If the energy efficiency has not improved, execute a refrigerant storage action (S215) and exit control (S216).

[0104] The multi-split air conditioning system control method provided in this invention controls the system's refrigerant storage tank to perform a refrigerant storage action. After the refrigerant storage action is completed and the system is running stably, the method acquires the current system energy efficiency changes. Based on the energy efficiency changes, the method controls the refrigerant storage tank to perform either a refrigerant storage action or a refrigerant discharge action to maximize energy efficiency. Therefore, it can determine whether to continue adjusting the refrigerant quantity based on the energy efficiency changes. If energy efficiency decreases after adjusting the refrigerant quantity, a reverse refrigerant adjustment is performed to restore the refrigerant state to its state before the previous adjustment, and it is considered that no further refrigerant adjustment is needed, thus exiting control. This optimizes the energy efficiency of the multi-split air conditioning system during operation, improving its working efficiency.

[0105] Figure 13 is a schematic diagram of a multi-unit air conditioning system control device provided in an embodiment of the present invention. As shown in Figure 13, the device specifically includes:

[0106] Control module 31 is used to control the liquid storage tank of the system to perform the refrigerant storage action;

[0107] The acquisition module 32 is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably.

[0108] The control module 31 is also used to control the liquid storage tank to perform a refrigerant storage action according to the energy efficiency change, or to control the liquid storage tank to perform a refrigerant discharge action according to the energy efficiency change, so as to maximize the energy efficiency.

[0109] In one possible implementation, the control module is specifically used to control the opening of the liquid inlet valve and the gas balance valve at the top of the liquid storage tank, and to control the closing of the liquid drain valve at the bottom of the liquid storage tank, so that refrigerant flows into the liquid storage tank through the liquid inlet valve, the gas balance valve is used to discharge the gaseous refrigerant in the liquid storage tank, and the liquid drain valve is used to discharge the liquid refrigerant in the liquid storage tank.

[0110] After a first time interval, the liquid inlet valve and the gas balance valve are closed.

[0111] In one possible implementation, the acquisition module is specifically used to acquire the first energy efficiency before performing the refrigerant storage action, and to acquire the second energy efficiency after the system has stabilized.

[0112] When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0113] In one possible implementation, the control module is specifically used to perform a refrigerant discharge action when the energy efficiency change is that the energy efficiency has not improved. The refrigerant discharge action is to control the drain valve to open.

[0114] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0115] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0116] In one possible implementation, the control module is specifically used to repeatedly execute the refrigerant storage action and repeatedly execute the step of acquiring the energy efficiency change when the energy efficiency change is an improvement.

[0117] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0118] In one possible implementation, the control module is further configured to repeat the refrigerant storage action when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, until the energy efficiency change is no improvement in energy efficiency, and then execute a refrigerant discharge action once to end the control.

[0119] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0120] In one possible implementation, the control module is further configured to perform a refrigerant discharge action when the energy efficiency change after the first refrigerant storage action is no improvement.

[0121] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0122] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0123] The multi-split air conditioning system control device provided in this embodiment can be the device shown in Figure 13. It can execute all the steps of the multi-split air conditioning system control method shown in Figure 6, thereby achieving the technical effect of the multi-split air conditioning system control method shown in Figure 6. For details, please refer to the relevant description in Figure 6. For the sake of brevity, it will not be elaborated here.

[0124] Figure 14 is a schematic diagram of a computer device according to an embodiment of the present invention. The computer device 400 shown in Figure 14 includes at least one processor 401, a memory 402, at least one network interface 404, and other user interfaces 403. The various components in the computer device 400 are coupled together through a bus system 405. It is understood that the bus system 405 is used to realize the connection and communication between these components. In addition to a data bus, the bus system 405 also includes a power bus, a control bus, and a status signal bus. However, for clarity, all buses are labeled as bus system 405 in Figure 14.

[0125] The user interface 403 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0126] It is understood that the memory 402 in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 402 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0127] In some implementations, memory 402 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 4021 and application program 4022.

[0128] The operating system 4021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 4022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 4022.

[0129] In this embodiment of the invention, by calling the program or instructions stored in the memory 402, specifically the program or instructions stored in the application program 4022, the processor 401 executes the method steps provided in each method embodiment, including, for example:

[0130] Control the liquid storage tank of the system to perform the refrigerant storage action;

[0131] Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained.

[0132] The system controls the liquid storage tank to perform a refrigerant storage action based on the energy efficiency changes, or controls the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency changes, so as to maximize the energy efficiency.

[0133] In one possible implementation, the inlet valve and the gas balance valve at the top of the liquid storage tank are opened, and the drain valve at the bottom of the liquid storage tank is closed, so that refrigerant flows into the liquid storage tank through the inlet valve. The gas balance valve is used to discharge the gaseous refrigerant in the liquid storage tank, and the drain valve is used to discharge the liquid refrigerant in the liquid storage tank. After a first time interval, the inlet valve and the gas balance valve are closed.

[0134] In one possible implementation, a first energy efficiency is obtained before the refrigerant storage action is performed, and a second energy efficiency is obtained after the system is running stably; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0135] In one possible implementation, when the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed, which involves controlling the drain valve to open.

[0136] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0137] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0138] In one possible implementation, when the energy efficiency change indicates an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeatedly executed; until the energy efficiency change indicates no improvement in energy efficiency, a refrigerant discharge action is executed once and the control ends.

[0139] In one possible implementation, when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency, then the refrigerant discharge action is executed once and the control ends.

[0140] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0141] In one possible implementation, if the energy efficiency change after the first refrigerant storage action is no improvement, a refrigerant discharge action is performed.

[0142] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0143] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0144] The methods disclosed in the above embodiments of the present invention can be applied to processor 401, or implemented by processor 401. Processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 401 or by instructions in the form of software. The processor 401 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 402. Processor 401 reads the information in memory 402 and, in conjunction with its hardware, completes the steps of the above method.

[0145] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0146] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0147] The computer device provided in this embodiment can be the computer device shown in Figure 14, which can execute all the steps of the multi-unit system control method shown in Figure 6, thereby achieving the technical effect of the multi-unit system control method shown in Figure 6. For details, please refer to the relevant description in Figure 6. For the sake of brevity, it will not be elaborated here.

[0148] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; the memory may also include combinations of the above types of memory.

[0149] When one or more programs in the storage medium can be executed by one or more processors to implement the above-described multi-unit system control method executed on the device side.

[0150] The processor is used to execute the multi-split system control program stored in the memory to implement the following steps of the multi-split system control method executed on the device side: controlling the system's liquid storage tank to perform a refrigerant storage action; when the refrigerant storage action is completed and the system is running stably, obtaining the current energy efficiency change of the system; controlling the liquid storage tank to perform a refrigerant storage action according to the energy efficiency change, or controlling the liquid storage tank to perform a refrigerant discharge action according to the energy efficiency change, so that the energy efficiency reaches the maximum.

[0151] In one possible implementation, the inlet valve and the gas balance valve at the top of the liquid storage tank are opened, and the drain valve at the bottom of the liquid storage tank is closed, so that refrigerant flows into the liquid storage tank through the inlet valve. The gas balance valve is used to discharge the gaseous refrigerant in the liquid storage tank, and the drain valve is used to discharge the liquid refrigerant in the liquid storage tank. After a first time interval, the inlet valve and the gas balance valve are closed.

[0152] In one possible implementation, a first energy efficiency is obtained before the refrigerant storage action is performed, and a second energy efficiency is obtained after the system is running stably; when the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement, and when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0153] In one possible implementation, when the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed. The refrigerant discharge action is as follows: control the drain valve to open; after the refrigerant discharge action is completed and the system is running stably, the step of obtaining the current energy efficiency change of the system is repeated; when the energy efficiency change is that the energy efficiency has improved, the refrigerant discharge action is repeated until the energy efficiency change is that the energy efficiency has not improved, at which point a refrigerant storage action is performed once and the control ends.

[0154] In one possible implementation, when the energy efficiency change indicates an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeatedly executed; until the energy efficiency change indicates no improvement in energy efficiency, a refrigerant discharge action is executed once and the control ends.

[0155] In one possible implementation, when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency, then the refrigerant discharge action is executed once and the control ends.

[0156] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0157] In one possible implementation, if the energy efficiency change after the first refrigerant storage action is no improvement, a refrigerant discharge action is performed.

[0158] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0159] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0160] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0161] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0162] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a multi-unit air conditioning system, wherein, The multi-split air conditioning system includes a liquid storage tank, characterized in that the control method of the multi-split air conditioning system includes: Control the liquid storage tank to perform the refrigerant storage action; Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained. The system controls the liquid storage tank to perform a refrigerant storage action based on the energy efficiency change, or controls the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change.

2. The method according to claim 1, characterized in that, The control system's liquid storage tank performs the refrigerant storage action, including: The liquid inlet valve and the gas balance valve of the liquid storage tank are controlled to open, and the liquid drain valve of the liquid storage tank is controlled to close. The gas balance valve is used to control the discharge of gaseous refrigerant in the liquid storage tank, and the liquid drain valve is used to control the discharge of liquid refrigerant in the liquid storage tank. After a first time interval, the liquid inlet valve and the gas balance valve are closed.

3. The method according to claim 1 or 2, characterized in that, The step of obtaining the current energy efficiency change of the system includes: Obtain the first energy efficiency before performing the refrigerant storage action, and obtain the second energy efficiency after the system is running stably; When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

4. The method according to claim 3, characterized in that, The step of controlling the liquid storage tank to perform refrigerant discharge based on the energy efficiency change includes the following steps when the energy efficiency change indicates no improvement: The liquid storage tank is controlled to perform a refrigerant discharge action, which involves controlling the discharge valve to open. Once the refrigerant discharge operation is completed and the system is operating stably, the energy efficiency change of the system is acquired again. When the energy efficiency change is obtained again and it shows an improvement, return to the previous step of performing the refrigerant discharge action; When the energy efficiency change is found to be unchanged, the liquid storage tank is controlled to perform a refrigerant storage action.

5. The method according to claim 3, characterized in that, The step of controlling the liquid storage tank to perform refrigerant storage based on the energy efficiency change includes the following steps when the energy efficiency change is an improvement: The liquid storage tank is controlled again to perform the refrigerant storage action; Once the refrigerant storage action is completed and the system is operating stably, the energy efficiency change of the system is acquired again. When the energy efficiency change is obtained again and it is an improvement in energy efficiency, return to the execution and control the liquid storage tank to perform the refrigerant storage action again; When the energy efficiency change is found to be no improvement, the liquid storage tank is controlled to perform a refrigerant discharge action.

6. The method according to claim 3, characterized in that, The step of controlling the liquid storage tank to perform refrigerant storage based on the energy efficiency change includes the following steps when the energy efficiency change is an improvement and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference: The liquid storage tank is controlled again to perform the refrigerant storage action; Once the refrigerant storage action is completed and the system is operating stably, the energy efficiency change of the system is acquired again. When the energy efficiency change is obtained again and it is an improvement, return to the execution and control the liquid storage tank to perform the refrigerant storage action again; When the energy efficiency change is found to be no improvement, the liquid storage tank is controlled to perform a refrigerant discharge action.

7. The method according to claim 3, characterized in that, The method further includes ending control when the energy efficiency change is an improvement in energy efficiency and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference.

8. The method according to claim 3, characterized in that, The step of controlling the liquid storage tank to perform refrigerant discharge based on the energy efficiency change includes the following steps when the energy efficiency change indicates no improvement: The liquid storage tank is controlled to perform a refrigerant discharge action, which is to control the liquid discharge valve to open; When the refrigerant storage action is completed and the system is running stably, and the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the liquid storage tank is controlled to perform the refrigerant discharge action again, and the current energy efficiency change of the system is obtained again. When the energy efficiency change is obtained again and the energy efficiency is improved, and the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, return to the steps of controlling the liquid storage tank to perform the refrigerant storage action again and obtaining the current energy efficiency change of the system again. When the energy efficiency change is found to be no improvement, the liquid storage tank is controlled to perform a refrigerant discharge action.

9. The method according to claim 3, characterized in that, The step of controlling the liquid storage tank to perform refrigerant discharge based on the energy efficiency change includes the following steps when the energy efficiency change indicates no improvement: The liquid storage tank is controlled to perform a refrigerant discharge action, which is to control the liquid discharge valve to open; Once the system is running stably, when the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

10. The method according to any one of claims 4-6, 8-9, characterized in that, Corresponding to the refrigerant discharge action, the current system energy efficiency change is obtained, including: Obtain the first energy efficiency before performing the refrigerant discharge action, and obtain the second energy efficiency after the system is running stably; When the second energy efficiency is greater than the first energy efficiency, the change in energy efficiency is determined to be an improvement in energy efficiency; when the second energy efficiency is less than or equal to the first energy efficiency, the change in energy efficiency is determined to be no improvement in energy efficiency.

11. The method according to any one of claims 1-10, characterized in that, Determining whether the system is operating stably includes: acquiring the system's energy efficiency at predetermined intervals; and determining the system's steady state when the system's energy efficiency remains stable.

12. A multi-split air conditioning system, characterized in that, The method for implementing any one of claims 1-11 includes: the liquid storage tank, wherein the liquid storage tank includes the inlet valve, the gas balance valve and the drain valve; The first end of the liquid storage tank is connected to one end of the liquid inlet valve, the second end of the liquid storage tank is connected to one end of the gas balance valve, and the third end of the liquid storage tank is connected to one end of the liquid outlet valve. The other end of the inlet valve is connected to the liquid-side main pipe on the medium-pressure side, and the inlet valve is used to control the flow of refrigerant into the storage tank; The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side. The gas balance valve is used to control the discharge of gaseous refrigerant from the storage tank, and the drain valve is used to control the discharge of liquid refrigerant from the storage tank.

13. A control device for a multi-unit air conditioning system, wherein, The multi-unit air conditioning system includes a liquid storage tank, characterized in that it comprises: The control module is used to control the liquid storage tank to perform the refrigerant storage action; The acquisition module is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably. The control module is also used to control the liquid storage tank to perform a refrigerant storage action based on the energy efficiency change, or to control the liquid storage tank to perform a refrigerant discharge action based on the energy efficiency change.

14. A computer device, characterized in that, include: A processor and a memory, the processor being configured to execute a multi-unit system control program stored in the memory to implement the multi-unit system control method according to any one of claims 1-11.

15. A storage medium, characterized in that, The storage medium stores one or more programs, which are executed by one or more processors to implement the multi-unit system control method according to any one of claims 1-11.

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