Control methods, devices, and air conditioning systems for air conditioning systems; computer-readable storage media

Abstract

This application relates to the field of air conditioning technology and discloses a control method for an air conditioning system, comprising: obtaining the real-time discharge temperature of the compressor when the enthalpy-increasing pipeline is open; opening the subcooling control valve to open the subcooling pipeline when the real-time discharge temperature is greater than a first discharge temperature; adjusting the operating frequency of the compressor when the real-time discharge temperature is less than a second discharge temperature; closing the subcooling control valve to disconnect the subcooling pipeline; and wherein the second discharge temperature is less than or equal to the first discharge temperature. This application, after reducing the discharge temperature, does not immediately close the subcooling control valve, but rather adaptively adjusts the compressor's operating frequency to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This pre-emptively reserves the load to be borne, avoiding compressor overload damage or even shutdown, and is beneficial for ensuring reliable compressor operation. This application also discloses a control device for an air conditioning system, an air conditioning system, and a computer-readable storage medium.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, such as a control method, apparatus, and air conditioning system for an air conditioning system, and a computer-readable storage medium. Background Technology

[0002] Currently, with the continuous improvement of people's living standards, air conditioners have become an indispensable household appliance in daily life. In daily use, air conditioners can meet users' comfort needs by adjusting the temperature according to the user's settings. However, under certain extreme environmental conditions, the heat exchanger's heat exchange capacity is prone to decrease, resulting in insufficient heat exchange and thus affecting the air conditioner's performance. To address this, enthalpy-increasing gas injection technology can be used to improve system energy efficiency and air conditioning capacity. Among these technologies, a multi-split air conditioning system is proposed, including: a compressor, an evaporator, a condenser, and a subcooler. The return flow end of the subcooler returns to the compressor through a return pipe. Between the return pipe and the compressor, a parallel subcooling pipe and an enthalpy-increasing pipe are connected. The subcooling pipe merges with the evaporator exhaust pipe and then connects to the low-pressure suction end of the compressor. The enthalpy-increasing pipe is connected to the intermediate-pressure suction end of the compressor. The system also includes a switching device for controlling the opening or closing of the subcooling pipe and / or the enthalpy-increasing pipe.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] The relevant technology utilizes the switching control between subcooling mode and enthalpy-increasing mode to better optimize the capacity and energy efficiency of multi-unit refrigeration and heating processes. In subcooling mode, both the subcooling valve and the enthalpy-increasing valve are open; while in enthalpy-increasing mode, the subcooling valve is closed and the enthalpy-increasing valve is open. However, during the switch from subcooling mode to enthalpy-increasing mode, suddenly closing the subcooling valve can cause all the auxiliary refrigerant to flow into the compressor's enthalpy-increasing line, resulting in a sudden increase in compressor power and potentially causing overload damage to the compressor in a short period. Therefore, this technology carries the risk of drastic load changes, leading to poor compressor reliability.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a control method, device, air conditioning system, and computer-readable storage medium for an air conditioning system. It can reserve the load to be borne in advance, avoid compressor overload damage or even shutdown, and help ensure reliable compressor operation.

[0008] In some embodiments, the air conditioning system includes: a compressor; a four-way valve; an indoor heat exchanger; an outdoor heat exchanger; a gas-liquid separator disposed in the suction pipe; an intermediate heat exchanger having a main heat exchange path and an auxiliary heat exchange path, the inlet section of the auxiliary heat exchange path having a throttling device, and the outlet section of the auxiliary heat exchange path splitting into an enthalpy-increasing pipe and a subcooling pipe, the enthalpy-increasing pipe being connected to the enthalpy-increasing port of the compressor, and having an enthalpy-increasing control valve on the enthalpy-increasing pipe; the subcooling pipe being connected to the gas-liquid separator, and having a subcooling control valve on the subcooling pipe; the method includes: obtaining the real-time discharge temperature of the compressor when the enthalpy-increasing pipe is open; opening the subcooling control valve to open the subcooling pipe when the real-time discharge temperature is greater than a first discharge temperature; adjusting the operating frequency of the compressor when the real-time discharge temperature is less than a second discharge temperature; and closing the subcooling control valve to disconnect the subcooling pipe; wherein the second discharge temperature is less than or equal to the first discharge temperature.

[0009] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the control method for an air conditioning system described above when the program instructions are executed.

[0010] In some embodiments, the air conditioning system includes: a compressor, including an exhaust port, an intake port, and an enthalpy-increasing port; a four-way valve, connected to the compressor's exhaust port to form an exhaust pipe and connected to the compressor's intake port to form an intake pipe; an indoor heat exchanger, connected to the four-way valve; an outdoor heat exchanger, connected to the four-way valve; a gas-liquid separator, disposed in the intake pipe; and an intermediate heat exchanger, having a main heat exchange path and an auxiliary heat exchange path, the inlet section of the main heat exchange path connected to the outdoor heat exchanger, and the outlet section of the main heat exchange path connected to the indoor heat exchanger. The internal heat exchanger is connected, and the inlet section of the auxiliary heat exchange circuit is connected to the inlet section of the main heat exchange circuit. The inlet section of the auxiliary heat exchange circuit is equipped with a throttling device. The outlet section of the auxiliary heat exchange circuit is divided into an enthalpy-increasing pipeline and a subcooling pipeline. The enthalpy-increasing pipeline is connected to the enthalpy-increasing port of the compressor and is equipped with an enthalpy-increasing control valve. The subcooling pipeline is connected to the gas-liquid separator and is equipped with a subcooling control valve. The aforementioned control device for the air conditioning system is electrically connected to the compressor, the throttling device, the enthalpy-increasing control valve, and the subcooling control valve.

[0011] In some embodiments, the computer-readable storage medium stores program instructions that, when executed, cause the computer to perform the control method for the air conditioning system described above.

[0012] The control method, apparatus, air conditioning system, and computer-readable storage medium for air conditioning systems provided in this disclosure can achieve the following technical effects:

[0013] In this embodiment, the enthalpy-increasing pipeline is activated to improve system energy efficiency and ensure the air conditioning's cooling and heating capacity under extreme environments. As the enthalpy-increasing pipeline operates, this embodiment continuously acquires the real-time discharge temperature of the compressor to monitor its normal operation. When the real-time discharge temperature exceeds a first discharge temperature, the discharge temperature overheat protection is triggered. This embodiment opens the subcooling control valve to allow the subcooling pipeline to introduce lower-temperature refrigerant into the gas-liquid separator for cooling, thereby reducing the compressor's suction temperature and achieving the protection purpose of reducing discharge temperature. When the real-time discharge temperature continues to decrease until it falls below a second discharge temperature, the discharge temperature overheat protection is deactivated. However, the subcooling control valve is not immediately closed; instead, the compressor's operating frequency is adaptively adjusted to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This allows for advance preparation of the load to be borne, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation.

[0014] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0016] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this disclosure;

[0017] Figure 2 This is a schematic diagram of a control method for an air conditioning system provided in an embodiment of this disclosure;

[0018] Figure 3 This is a schematic diagram of another control method for an air conditioning system provided in an embodiment of this disclosure;

[0019] Figure 4 This is a schematic diagram of another control method for an air conditioning system provided in an embodiment of this disclosure;

[0020] Figure 5 This is a schematic diagram of another control method for an air conditioning system provided in an embodiment of this disclosure;

[0021] Figure 6 This is a schematic diagram of a control device for an air conditioning system provided in an embodiment of this disclosure;

[0022] Figure 7 This is a schematic diagram of an air conditioner provided in an embodiment of this disclosure.

[0023] Figure label:

[0024] 10: Compressor; 20: Four-way valve; 30: Indoor heat exchanger; 40: Outdoor heat exchanger; 50: Gas-liquid separator; 60: Intermediate heat exchanger; 70: Throttling device; 81: Enthalpy-increasing control valve; 82: Subcooling control valve; 91: First shut-off valve; 92: Second shut-off valve; 101: First temperature sensor; 102: Second temperature sensor; 110: Exhaust pipe; 120: Suction pipe; 210: Inlet section of main heat exchange circuit; 220: Outlet section of main heat exchange circuit; 310: Inlet section of auxiliary heat exchange circuit; 320: Outlet section of auxiliary heat exchange circuit; 321: Enthalpy-increasing pipe; 322: Subcooling pipe; 600: Control device for air conditioning system; 601: Processor; 602: Memory; 603: Communication interface; 604: Bus; 700: Air conditioner body. Detailed Implementation

[0025] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0026] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0027] Unless otherwise stated, the term "multiple" means two or more.

[0028] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0029] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0030] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0031] Currently, with the continuous improvement of people's living standards, air conditioners have become an indispensable household appliance in daily life. In daily use, air conditioners can meet users' comfort needs by adjusting the temperature according to the user's settings. However, under certain extreme environmental conditions, the heat exchanger's heat exchange capacity is prone to decrease, resulting in insufficient heat exchange and thus affecting the air conditioner's performance. To address this, enthalpy-increasing gas injection technology can be used to improve system energy efficiency and air conditioning capacity. Among these technologies, a multi-split air conditioning system is proposed, including: a compressor, an evaporator, a condenser, and a subcooler. The return flow end of the subcooler returns to the compressor through a return pipe. Between the return pipe and the compressor, a parallel subcooling pipe and an enthalpy-increasing pipe are connected. The subcooling pipe merges with the evaporator exhaust pipe and then connects to the low-pressure suction end of the compressor. The enthalpy-increasing pipe is connected to the intermediate-pressure suction end of the compressor. The system also includes a switching device for controlling the opening or closing of the subcooling pipe and / or the enthalpy-increasing pipe.

[0032] The relevant technology utilizes the switching control between subcooling mode and enthalpy-increasing mode to better optimize the capacity and energy efficiency of multi-unit refrigeration and heating processes. In subcooling mode, both the subcooling valve and the enthalpy-increasing valve are open; while in enthalpy-increasing mode, the subcooling valve is closed and the enthalpy-increasing valve is open. However, during the switch from subcooling mode to enthalpy-increasing mode, suddenly closing the subcooling valve can cause all the auxiliary refrigerant to flow into the compressor's enthalpy-increasing line, resulting in a sudden increase in compressor power and potentially causing overload damage to the compressor in a short period. Therefore, this technology carries the risk of drastic load changes, leading to poor compressor reliability.

[0033] Combination Figure 1As shown, this embodiment of the present disclosure provides an air conditioning system, including: a compressor 10, a four-way valve 20, an indoor heat exchanger 30, an outdoor heat exchanger 40, a gas-liquid separator 50, and an intermediate heat exchanger 60. The compressor 10 includes an exhaust port, an intake port, and an enthalpy-increasing port. The four-way valve 20 is connected to the exhaust port of the compressor 10 to form an exhaust pipe 110, and is connected to the intake port of the compressor 10 to form an intake pipe 120. The indoor heat exchanger 30 is connected to the four-way valve 20. The outdoor heat exchanger 40 is connected to the four-way valve 20. The gas-liquid separator 50 is disposed in the intake pipe 120. The intermediate heat exchanger 60 has a main heat exchange path and an auxiliary heat exchange path. The inlet section 210 of the main heat exchange path is connected to the outdoor heat exchanger 40, and the outlet section 220 of the main heat exchange path is connected to the indoor heat exchanger 30. The inlet section 310 of the auxiliary heat exchange circuit is connected to the inlet section 210 of the main heat exchange circuit, and the inlet section 310 of the auxiliary heat exchange circuit is equipped with a throttling device 70. The outlet section 320 of the auxiliary heat exchange circuit is divided into an enthalpy-increasing pipeline 321 and a subcooling pipeline 322. The enthalpy-increasing pipeline 321 is connected to the enthalpy-increasing port of the compressor 10, and an enthalpy-increasing control valve 81 is installed on the enthalpy-increasing pipeline 321. The subcooling pipeline 322 is connected to the gas-liquid separator 50, and a subcooling control valve 82 is installed on the subcooling pipeline 322.

[0034] The air conditioning system provided in this embodiment can improve system energy efficiency and ensure the air conditioning cooling and heating capacity under extreme environments by opening the enthalpy-increasing control valve 81 to conduct the enthalpy-increasing pipeline 321. Furthermore, by opening the subcooling control valve 82 to conduct the subcooling pipeline 322, lower-temperature refrigerant can be introduced into the gas-liquid separator for cooling, thereby reducing the suction temperature of the compressor 10 and achieving the protective purpose of reducing the discharge temperature, which is beneficial to the reliable operation of the compressor 10.

[0035] Optionally, the intermediate heat exchanger 60 is a plate heat exchanger. In this way, the embodiments of the present disclosure can realize the heat exchange of refrigerant between the main heat exchange circuit and the auxiliary heat exchange circuit, thereby increasing the subcooling of the system, improving the enthalpy increase capacity, which is conducive to improving the system energy efficiency and ensuring the air conditioning capacity.

[0036] Optionally, the throttling device 70 is an electronic expansion valve. In this way, by controlling the opening of the electronic expansion valve, the refrigerant flow on the enthalpy-increasing pipe 321 and the subcooling pipe 322 can be reasonably adjusted, which is beneficial to improving system energy efficiency, ensuring air conditioning capacity, and enabling the compressor 10 to operate reliably.

[0037] Optionally, the enthalpy-increasing control valve 81 and the subcooling control valve 82 are solenoid valves. In this way, by controlling the opening and closing state of the above-mentioned solenoid valves, the embodiments of this disclosure can control the corresponding enthalpy-increasing pipeline 321 and subcooling pipeline 322 to be connected or disconnected, thereby improving system energy efficiency, ensuring air conditioning capacity, and enabling the compressor 10 to operate reliably.

[0038] Optionally, the air conditioning system further includes a first shut-off valve 91 and a second shut-off valve 92. The first shut-off valve 91 is located at the outlet section 220 of the main heat exchange circuit. The second shut-off valve 92 is located in the pipeline between the indoor heat exchanger 30 and the four-way valve 20. In this way, the embodiments of this disclosure can regulate the refrigerant flow rate in the main circuit to maintain the superheat of the system, which is beneficial to the stable operation of the system.

[0039] Optionally, the air conditioning system further includes a first temperature sensor 101 and a second temperature sensor 102. The first temperature sensor 101 is located on the pipeline between the intermediate heat exchanger 60 and the throttling device 70, and is used to detect the refrigerant inlet temperature of the intermediate heat exchanger 60 on the auxiliary heat exchange path. The second temperature sensor 102 is located on the outlet section 320 of the auxiliary heat exchange path, and is used to detect the refrigerant outlet temperature of the intermediate heat exchanger 60 on the auxiliary heat exchange path. In this way, the embodiments of this disclosure can detect the refrigerant temperature of the auxiliary paths before and after the intermediate heat exchanger 60, thereby obtaining the auxiliary heat exchange temperature difference of the intermediate heat exchanger 60, which is beneficial for the reasonable control of the refrigerant state on the auxiliary heat exchange path.

[0040] Optionally, the air conditioning system also includes a control device 600 for the air conditioning system. The control device 600 is electrically connected to the compressor 10, the throttling device 70, the enthalpy-increasing control valve 81, and the subcooling control valve 82. Thus, embodiments of this disclosure can execute corresponding control methods through this device to avoid overload damage or even shutdown of the compressor 10, thereby ensuring reliable operation of the compressor 10.

[0041] Based on the above air conditioning system, combined with Figure 2 As shown, this disclosure provides a control method for an air conditioning system, including:

[0042] S201, with the enthalpy-increasing pipeline open, the processor obtains the real-time exhaust temperature of the compressor.

[0043] S202, when the real-time exhaust temperature is higher than the first exhaust temperature, the processor opens the subcooling control valve to guide the subcooling pipeline.

[0044] S203: When the real-time exhaust temperature is lower than the second exhaust temperature, the processor adjusts the compressor's operating frequency.

[0045] S204, the processor closes the subcooling control valve to disconnect the subcooling line.

[0046] The second exhaust temperature is less than or equal to the first exhaust temperature.

[0047] The control method for air conditioning systems provided in this disclosure improves system energy efficiency and ensures air conditioning cooling and heating capacity under extreme environments by activating the enthalpy-increasing pipeline. As the enthalpy-increasing pipeline operates, this disclosure continuously acquires the real-time discharge temperature of the compressor to monitor its normal operation. When the real-time discharge temperature exceeds a first discharge temperature, over-discharge temperature protection is triggered. This disclosure opens the subcooling control valve to allow the introduction of a lower-temperature refrigerant into the gas-liquid separator for cooling, thereby reducing the compressor's suction temperature and achieving the protection purpose of reducing discharge temperature. When the real-time discharge temperature continues to decrease until it falls below a second discharge temperature, the over-discharge temperature protection is deactivated. However, the subcooling control valve is not immediately closed; instead, the compressor's operating frequency is adaptively adjusted to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This allows for advance preparation of the load to be borne, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation.

[0048] Optionally, the first exhaust temperature can be set according to the compressor configuration information. Preferably, the first exhaust temperature can be set to 100°C to determine whether the exhaust temperature overheat protection is triggered. The first exhaust temperature can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 98°C or 96°C.

[0049] Optionally, the second exhaust temperature can be set according to the compressor configuration information. Preferably, the second exhaust temperature can be set to 95°C to determine whether to deactivate the exhaust temperature overheat protection. The second exhaust temperature can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 94°C or 93°C.

[0050] Optionally, the processor adjusts the compressor's operating frequency by adjusting the compressor's operating frequency based on the compressor's real-time current. In this way, the embodiments of this disclosure can detect the compressor's real-time current to determine whether the compressor is currently or about to be in an overload state before the subcooling control valve closes. Based on this, the embodiments of this disclosure determine whether it is necessary to adjust the compressor's operating frequency accordingly to reasonably reduce the compressor's power under high load conditions. This can prevent compressor overload damage or even shutdown, thus helping to ensure reliable compressor operation.

[0051] Optionally, the processor adjusts the compressor's operating frequency based on the compressor's real-time current, including: reducing the compressor's operating frequency when the ratio of the compressor's real-time current to the frequency-limiting current is greater than a preset ratio; or maintaining the compressor's operating frequency when the ratio is less than or equal to the preset ratio. Thus, when the ratio of the compressor's real-time current to the frequency-limiting current is greater than the preset ratio, it indicates that the compressor is currently under high load. At this time, closing the subcooling control valve increases the likelihood of overload damage and compressor shutdown. Therefore, this embodiment appropriately reduces the compressor's operating frequency to pre-reduce the compressor's power under high load before the subcooling control valve closes. This allows for advance preparation of the load to be borne, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation. Conversely, when the ratio of the compressor's real-time current to the frequency-limiting current is less than or equal to the preset ratio, it indicates that the compressor is not currently under high load. Even if the subcooling control valve is closed at this time, the compressor is less likely to experience overload damage or shutdown. Therefore, the embodiments disclosed herein maintain the operating frequency of the compressor to ensure the cooling and heating capacity of the air conditioner.

[0052] Optionally, the preset ratio can be set according to the operating mode of the air conditioning system. Preferably, the preset ratio can be set to 90% to determine the actual load state of the compressor before the subcooling control valve closes. The preset ratio can also be adjusted according to the user's actual needs, or set to any other reasonable value such as 80% or 95%.

[0053] Optionally, the processor reduces the compressor's operating frequency by: determining a target frequency reduction value based on the first opening degree of the throttling device before the subcooling control valve opens and the second opening degree of the throttling device after the subcooling control valve opens; and reducing the compressor's operating frequency according to the target frequency reduction value. In this way, the embodiments of this disclosure can analyze the change in the opening degree of the throttling device before and after the subcooling pipeline is opened by combining the first and second opening degrees, thereby determining the change in compressor operating load corresponding to the opening and closing of the subcooling pipeline. Then, the embodiments of this disclosure can predict the margin for subsequent load surges, and thus determine a suitable target frequency reduction value for the compressor's operating frequency, thereby more reasonably reducing the compressor's power under high load conditions and helping to ensure reliable compressor operation.

[0054] Optionally, the processor determines the target frequency reduction value based on the first opening degree of the throttling device before the subcooling control valve opens and the second opening degree of the throttling device after the subcooling control valve opens. This includes: the processor calculating the ratio of the second opening degree of the throttling device after the subcooling control valve opens to the first opening degree of the throttling device before the subcooling control valve opens; and the processor calculating the product of the opening ratio and the frequency compensation coefficient to obtain the target frequency reduction value. Thus, when the subcooling control valve opens, to achieve the protective purpose of reducing the exhaust temperature, the throttling device needs to adaptively increase its opening degree to reduce the refrigerant temperature at the outlet section of the heat exchange auxiliary circuit. Then, this embodiment of the present disclosure can determine the accurate target frequency reduction value based on the opening ratio of the throttling device and the frequency compensation coefficient. The larger the opening ratio of the second opening degree to the first opening degree, the greater the change in the opening degree of the throttling device after passing through the subcooling pipeline, and the more likely the compressor is to enter a full-load state. In this case, when the subcooling control valve is closed, the risk of compressor overload damage caused by sudden load changes is greater. Therefore, the present invention can set a larger target frequency reduction value to make the compressor operate at a lower frequency when the subcooling control valve is closed, thereby further reducing the compressor's power under high load conditions. Thus, by reserving an appropriate amount of load to be borne in advance, the present invention can avoid compressor overload damage or even shutdown, which is beneficial to ensuring reliable compressor operation.

[0055] Optionally, the frequency compensation coefficient can be determined empirically or obtained through experimental testing. Preferably, the frequency compensation coefficient can be set to 0.6. The frequency compensation coefficient can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 0.5 or 0.8.

[0056] Based on the above air conditioning system, combined with Figure 3 As shown, this disclosure provides another control method for an air conditioning system, including:

[0057] S301, with the enthalpy-increasing pipeline open, the processor obtains the real-time discharge temperature of the compressor.

[0058] S302: When the real-time exhaust temperature is higher than the first exhaust temperature, the processor opens the supercooling control valve to guide the supercooling pipeline.

[0059] S303, the processor adjusts the opening of the throttling device to make the auxiliary heat exchange temperature difference of the intermediate heat exchanger approach the target heat exchange temperature difference.

[0060] S304: When the real-time exhaust temperature is lower than the second exhaust temperature, the processor adjusts the compressor's operating frequency.

[0061] S305, the processor closes the subcooling control valve to disconnect the subcooling line.

[0062] The second exhaust temperature is less than or equal to the first exhaust temperature.

[0063] The control method for an air conditioning system provided in this disclosure improves system energy efficiency and ensures air conditioning cooling and heating capacity under extreme environments by activating the enthalpy-increasing pipeline. As the enthalpy-increasing pipeline operates, this disclosure continuously acquires the real-time discharge temperature of the compressor to monitor its normal operation. When the real-time discharge temperature exceeds a first discharge temperature, high discharge temperature protection is triggered. This disclosure opens the subcooling control valve to allow the subcooling pipeline to introduce lower-temperature refrigerant into the gas-liquid separator for cooling, thereby reducing the compressor's suction temperature and achieving the protection purpose of reducing discharge temperature. Simultaneously, this disclosure adjusts the opening of the throttling device to bring the auxiliary heat exchange temperature difference of the intermediate heat exchanger closer to the target heat exchange temperature difference. This provides more lower-temperature refrigerant to the subcooling pipeline, facilitating a faster reduction in the compressor's discharge temperature. When the real-time discharge temperature continues to decrease until it falls below a second discharge temperature, the high discharge temperature protection is deactivated. However, the subcooling control valve is not immediately closed; instead, the compressor's operating frequency is adaptively adjusted to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This allows for the provision of loads to be borne in advance, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation.

[0064] Optionally, the processor obtains the auxiliary heat exchange temperature difference of the intermediate heat exchanger in the following manner: the processor controls a first temperature sensor to detect and obtain the refrigerant inlet temperature of the intermediate heat exchanger on the auxiliary heat exchange path, and controls a second temperature sensor to detect and obtain the refrigerant outlet temperature of the intermediate heat exchanger on the auxiliary heat exchange path; the processor calculates the difference between the refrigerant outlet temperature and the refrigerant inlet temperature to obtain the auxiliary heat exchange temperature difference of the intermediate heat exchanger. Thus, by calculating the difference between the refrigerant outlet temperature and the refrigerant inlet temperature on the auxiliary heat exchange path of the intermediate heat exchanger, this embodiment of the present disclosure can determine the temperature change of the refrigerant after heat exchange in the auxiliary path through the intermediate heat exchanger, i.e., obtain the auxiliary heat exchange temperature difference of the intermediate heat exchanger. It can also adjust the opening of the throttling device accordingly to reasonably control the refrigerant state on the auxiliary heat exchange path.

[0065] Optionally, the processor adjusts the opening of the throttling device to bring the auxiliary heat exchange temperature difference of the intermediate heat exchanger closer to the target heat exchange temperature difference. This includes: increasing the opening of the throttling device when the auxiliary heat exchange temperature difference of the intermediate heat exchanger is greater than the target heat exchange temperature difference; or decreasing the opening of the throttling device when the auxiliary heat exchange temperature difference of the intermediate heat exchanger is less than the target heat exchange temperature difference. Thus, this embodiment of the present disclosure can optimize the opening of the throttling device based on the relationship between the auxiliary heat exchange temperature difference of the intermediate heat exchanger and the target heat exchange temperature difference, thereby allowing the auxiliary heat exchange temperature difference of the intermediate heat exchanger to gradually approach the target heat exchange temperature difference, so that the auxiliary refrigerant enters a suitable state, which is beneficial for rapidly reducing the compressor's discharge temperature.

[0066] Optionally, the target heat exchange temperature difference can be set according to the compressor's exhaust temperature. The higher the compressor's exhaust temperature, the smaller the target heat exchange temperature difference can be set. Preferably, the target heat exchange temperature difference can be set to -2℃. At this temperature, the refrigerant in the auxiliary circuit of the intermediate heat exchanger does not exchange heat completely, forming a low-temperature gas-liquid two-phase refrigerant. Furthermore, the refrigerant continues to absorb heat as it passes through the outlet section of the auxiliary heat exchange circuit, further reducing the refrigerant outlet temperature. Subsequently, more low-temperature gas-liquid two-phase refrigerant enters the gas-liquid separator for cooling, rapidly reducing the exhaust temperature. The target heat exchange temperature difference can also be adjusted according to the user's actual needs and can be set to any other reasonable value such as -1.5℃ or -2.5℃.

[0067] Optionally, the processor can use a PID (Proportional-Integral-Derivative) algorithm to increase or decrease the opening of the throttling device. The corresponding PID adjustment value can be a fixed number of steps or a fixed proportion. In this way, the embodiments of this disclosure can achieve precise adjustment of the auxiliary heat exchange temperature difference, so that it can gradually stabilize near the target heat exchange temperature difference.

[0068] Based on the above air conditioning system, combined with Figure 4 As shown, this disclosure provides another control method for an air conditioning system, including:

[0069] S401, with the enthalpy-increasing pipeline open, the processor obtains the real-time discharge temperature of the compressor.

[0070] S402: When the real-time exhaust temperature is higher than the first exhaust temperature, the processor opens the subcooling control valve to guide the cooling pipeline.

[0071] S403: When the real-time exhaust temperature is lower than the second exhaust temperature, the processor adjusts the compressor's operating frequency.

[0072] S404, the processor closes the subcooling control valve to disconnect the subcooling line.

[0073] S405: When the real-time exhaust temperature is lower than the third exhaust temperature, the processor closes the enthalpy increase control valve to disconnect the enthalpy increase pipeline.

[0074] Among them, the second exhaust temperature is less than or equal to the first exhaust temperature, and the third exhaust temperature is less than the second exhaust temperature.

[0075] The control method for air conditioning systems provided in this disclosure improves system energy efficiency and ensures air conditioning cooling and heating capacity under extreme environments by activating the enthalpy-increasing pipeline. As the enthalpy-increasing pipeline operates, this disclosure continuously acquires the real-time discharge temperature of the compressor to monitor its normal operation. When the real-time discharge temperature exceeds a first discharge temperature, over-discharge temperature protection is triggered. This disclosure opens the subcooling control valve to allow the introduction of a lower-temperature refrigerant into the gas-liquid separator for cooling, thereby reducing the compressor's suction temperature and achieving the protection purpose of reducing discharge temperature. When the real-time discharge temperature continues to decrease until it falls below a second discharge temperature, the over-discharge temperature protection is deactivated. However, the subcooling control valve is not immediately closed; instead, the compressor's operating frequency is adaptively adjusted to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This allows for advance preparation of the load to be borne, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation. Furthermore, when the real-time exhaust temperature is lower than the third exhaust temperature, the exhaust temperature is too low. In this embodiment of the present disclosure, the enthalpy increase control valve is closed to disconnect the enthalpy increase pipeline, thereby allowing all refrigerant to participate in the main circulation, quickly increasing the exhaust temperature, which is beneficial to the reliable operation of the air conditioning system.

[0076] Optionally, the third exhaust temperature can be set according to the compressor configuration information. Preferably, the third exhaust temperature can be set to 50°C to determine whether the exhaust temperature is too low and trigger the protection. The third exhaust temperature can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 45°C or 60°C.

[0077] Based on the above air conditioning system, combined with Figure 5 As shown, this disclosure provides another control method for an air conditioning system, including:

[0078] S501, with the enthalpy-increasing pipeline open, the processor obtains the real-time discharge temperature of the compressor.

[0079] S502: When the real-time exhaust temperature is higher than the first exhaust temperature, the processor opens the supercooling control valve to guide the supercooling pipeline.

[0080] S503: When the real-time exhaust temperature is lower than the second exhaust temperature, the processor adjusts the compressor's operating frequency.

[0081] S504, the processor adjusts the opening of the throttling device.

[0082] S505, the processor closes the subcooling control valve to disconnect the subcooling line.

[0083] The second exhaust temperature is less than or equal to the first exhaust temperature.

[0084] The control method for air conditioning systems provided in this disclosure improves system energy efficiency and ensures air conditioning cooling and heating capacity under extreme environments by activating the enthalpy-increasing pipeline. As the enthalpy-increasing pipeline operates, this disclosure continuously acquires the real-time discharge temperature of the compressor to monitor its normal operation. When the real-time discharge temperature exceeds a first discharge temperature, over-discharge temperature protection is triggered. This disclosure opens the subcooling control valve to allow the introduction of a lower-temperature refrigerant into the gas-liquid separator for cooling, thereby reducing the compressor's suction temperature and achieving the protection purpose of reducing discharge temperature. When the real-time discharge temperature continues to decrease until it falls below a second discharge temperature, the over-discharge temperature protection is deactivated. However, the subcooling control valve is not immediately closed; instead, the compressor's operating frequency is adaptively adjusted to pre-reduce the compressor's power under high load conditions before the subcooling control valve closes. This allows for advance preparation of the load to be borne, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation. Before closing the subcooling control valve, the embodiments of this disclosure can also adaptively adjust the opening of the throttling device to reduce the refrigerant flow in the enthalpy-increasing pipeline before the subcooling control valve closes. This proactively reduces the load that is about to change abruptly, thus avoiding compressor overload damage or even shutdown, and helping to ensure reliable compressor operation.

[0085] Optionally, in this embodiment of the disclosure, when the real-time exhaust temperature is lower than the second exhaust temperature, the order between step S503 (processor adjusting the compressor's operating frequency) and step S504 (processor adjusting the throttling device's opening) is not specifically limited. Steps S503 and S504 can be executed in parallel or sequentially.

[0086] Optionally, the processor adjusts the opening degree of the throttling device, including: the processor adjusting the opening degree of the throttling device according to the real-time current of the compressor. In this way, the embodiments of this disclosure can detect the real-time current of the compressor to determine whether the compressor is in or about to be in an overload state before the subcooling control valve closes. Then, the embodiments of this disclosure determine whether it is necessary to make corresponding adjustments to the opening degree of the throttling device to reasonably reduce the refrigerant flow in the enthalpy-increasing pipeline. This can avoid compressor overload damage or even shutdown, and is beneficial to ensuring reliable compressor operation.

[0087] Optionally, the processor adjusts the opening of the throttling device based on the real-time current of the compressor, including: reducing the opening of the throttling device when the ratio of the real-time current of the compressor to the frequency-limiting current is greater than a preset ratio; or maintaining the opening of the throttling device when the ratio is less than or equal to the preset ratio. Thus, when the ratio of the real-time current of the compressor to the frequency-limiting current is greater than the preset ratio, it indicates that the compressor is currently under high load. At this time, closing the subcooling control valve increases the likelihood of overload damage and compressor shutdown. Therefore, this embodiment appropriately reduces the opening of the throttling device to pre-reduce the refrigerant flow in the enthalpy-increasing pipeline before the subcooling control valve closes. This proactively reduces the impending sudden load change, preventing compressor overload damage or even shutdown, and ensuring reliable compressor operation. Conversely, when the ratio of the real-time current of the compressor to the frequency-limiting current is less than or equal to the preset ratio, it indicates that the compressor is not currently under high load. Even if the subcooling control valve is closed at this time, the compressor is less likely to experience overload damage or shutdown. Therefore, the present embodiment maintains the opening of the throttling device to give full play to the enthalpy increase capacity of the system, thereby improving the system energy efficiency and ensuring the air conditioning cooling and heating capacity under extreme environments.

[0088] Optionally, the preset ratio can be set according to the operating mode of the air conditioning system. Preferably, the preset ratio can be set to 90% to determine the actual load state of the compressor before the subcooling control valve closes. The preset ratio can also be adjusted according to the user's actual needs, or set to any other reasonable value such as 80% or 95%.

[0089] Optionally, the processor reduces the opening of the throttling device by: determining a target reduction value for the opening based on a first opening of the throttling device before the subcooling control valve opens and a second opening of the throttling device after the subcooling control valve opens; and reducing the opening of the throttling device according to the target reduction value. Thus, this embodiment of the present disclosure can analyze the change in the opening of the throttling device before and after the subcooling pipeline is opened by combining the first and second opening values, thereby determining the change in compressor operating load corresponding to the opening and closing of the subcooling pipeline. Based on this, this embodiment of the present disclosure can predict the margin for subsequent load surges, and further determine a suitable target reduction value for the throttling device opening, thereby more reasonably reducing the refrigerant flow rate on the enthalpy-increasing pipeline, which is beneficial to ensuring reliable compressor operation.

[0090] Optionally, the processor determines the target reduction value of the throttling device based on the first opening degree of the throttling device before the subcooling control valve opens and the second opening degree of the throttling device after the subcooling control valve opens. This includes: the processor calculating the opening difference between the second opening degree of the throttling device after the subcooling control valve opens and the first opening degree of the throttling device before the subcooling control valve opens; and the processor calculating the product of the opening difference and the opening compensation coefficient to obtain the target reduction value of the opening. Thus, when the subcooling control valve opens, to achieve the protective purpose of reducing the exhaust temperature, the throttling device needs to adaptively increase its opening degree to reduce the refrigerant temperature at the outlet section of the heat exchange auxiliary circuit. Then, this embodiment of the present disclosure can determine the accurate target reduction value based on the opening difference of the throttling device and the opening compensation coefficient. The larger the opening difference between the second and first opening degrees, the greater the change in the opening degree of the throttling device after passing through the subcooling pipeline, and the more likely the compressor is to enter a full-load state. In this case, the risk of compressor overload damage caused by sudden load changes when the subcooling control valve is closed is greater. Therefore, the present invention can set a larger target reduction value to make the opening of the throttling device smaller when the subcooling control valve is closed, thereby reducing the refrigerant flow in the enthalpy-increasing pipeline more significantly. Thus, by actively reducing the appropriate amount of load that is about to change abruptly, the present invention can avoid compressor overload damage or even shutdown, which is beneficial to ensuring reliable compressor operation.

[0091] Optionally, the opening compensation coefficient can be determined empirically or obtained through experimental testing. Preferably, the opening compensation coefficient can be set to 0.85. The opening compensation coefficient can also be adjusted according to the user's actual needs, and can be set to any other reasonable value such as 0.5 or 1.0.

[0092] Combination Figure 6 As shown, this disclosure provides a control device 600 for an air conditioning system, including a processor 601 and a memory 602. Optionally, the device 600 may further include a communication interface 603 and a bus 604. The processor 601, communication interface 603, and memory 602 can communicate with each other via the bus 604. The communication interface 603 can be used for information transmission. The processor 601 can call logical instructions in the memory 602 to execute the control method for the air conditioning system described in the above embodiment.

[0093] Furthermore, the logic instructions in the aforementioned memory 602 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0094] The memory 602, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 601 executes functional applications and data processing by running the program instructions / modules stored in the memory 602, thereby implementing the control method for the air conditioning system in the above embodiments.

[0095] The memory 602 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 602 may include high-speed random access memory and may also include non-volatile memory.

[0096] Combination Figure 7 As shown, this disclosure provides an air conditioner, including an air conditioner body 700 and the aforementioned control device 600 for an air conditioning system. The control device 600 for the air conditioning system is installed in the air conditioner body 700. The installation relationship described herein is not limited to placement inside the air conditioner body 700, but also includes installation connections with other components of the air conditioner, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the control device 600 for the air conditioning system can be adapted to feasible product bodies to achieve other feasible embodiments.

[0097] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for an air conditioning system.

[0098] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0099] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0100] Those skilled in the art will 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, or a combination of computer software and electronic hardware. 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 implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0101] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0102] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes: a compressor; a four-way valve; an indoor heat exchanger; an outdoor heat exchanger; a gas-liquid separator located in the suction pipe; an intermediate heat exchanger with a main heat exchange path and an auxiliary heat exchange path, the inlet section of the auxiliary heat exchange path having a throttling device, and the outlet section of the auxiliary heat exchange path splitting into an enthalpy-increasing pipe and a subcooling pipe, the enthalpy-increasing pipe being connected to the enthalpy-increasing port of the compressor and equipped with an enthalpy-increasing control valve, and the subcooling pipe being connected to the gas-liquid separator and equipped with a subcooling control valve; the method includes: With the enthalpy-increasing pipeline open, the real-time discharge temperature of the compressor is obtained; If the real-time exhaust temperature is higher than the first exhaust temperature, the subcooling control valve is opened to guide the subcooling pipeline. If the real-time exhaust temperature is lower than the second exhaust temperature, before closing the subcooling control valve, adjust the compressor's operating frequency according to the compressor's real-time current. Then close the subcooling control valve to disconnect the subcooling line; The second exhaust temperature is less than or equal to the first exhaust temperature.

2. The method according to claim 1, characterized in that, Adjusting the compressor's operating frequency based on the compressor's real-time current includes: If the ratio of the compressor's real-time current to the frequency-limiting current is greater than a preset ratio, reduce the compressor's operating frequency; or, The compressor's operating frequency is maintained when the ratio of the compressor's real-time current to the frequency-limiting current is less than or equal to a preset ratio.

3. The method according to claim 2, characterized in that, Reduce the compressor's operating frequency, including: The target frequency reduction value of the operating frequency is determined based on the first opening degree of the throttling device before the subcooling control valve is opened and the second opening degree of the throttling device after the subcooling control valve is opened. Reduce the compressor's operating frequency according to the target frequency reduction value.

4. The method according to any one of claims 1 to 3, characterized in that, After opening the subcooling control valve to guide the flow through the cooling pipes, the following steps are also included: Adjust the opening of the throttling device to make the auxiliary heat exchange temperature difference of the intermediate heat exchanger approach the target heat exchange temperature difference.

5. The method according to claim 4, characterized in that, Adjusting the opening of the throttling device to make the auxiliary heat exchange temperature difference of the intermediate heat exchanger approach the target heat exchange temperature difference includes: If the auxiliary heat exchange temperature difference of the intermediate heat exchanger is greater than the target heat exchange temperature difference, increase the opening of the throttling device; or... If the auxiliary heat exchange temperature difference of the intermediate heat exchanger is less than the target heat exchange temperature difference, reduce the opening of the throttling device.

6. The method according to any one of claims 1 to 3, characterized in that, After closing the subcooling control valve to disconnect the subcooling line, the following steps are also included: If the real-time exhaust temperature is lower than the third exhaust temperature, close the enthalpy increase control valve to disconnect the enthalpy increase pipeline; The temperature of the third exhaust is lower than that of the second exhaust.

7. The method according to any one of claims 1 to 3, characterized in that, Before closing the subcooling control valve to disconnect the subcooling line, the following steps are also included: Adjust the opening degree of the throttling device.

8. A control device for an air conditioning system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for an air conditioning system as described in any one of claims 1 to 7.

9. An air conditioning system, characterized in that, include: The compressor includes an exhaust port, an intake port, and an enthalpy-increasing port; The four-way valve is connected to the compressor's exhaust port to form an exhaust pipe, and connected to the compressor's suction port to form a suction pipe. Indoor heat exchanger, connected to a four-way valve; The outdoor heat exchanger is connected to a four-way valve. A gas-liquid separator is installed in the suction line; The intermediate heat exchanger is equipped with a main heat exchange circuit and an auxiliary heat exchange circuit. The inlet section of the main heat exchange circuit is connected to the outdoor heat exchanger, and the outlet section of the main heat exchange circuit is connected to the indoor heat exchanger. The inlet section of the auxiliary heat exchange circuit is connected to the inlet section of the main heat exchange circuit. The inlet section of the auxiliary heat exchange circuit is equipped with a throttling device. The outlet section of the auxiliary heat exchange circuit is divided into an enthalpy-increasing pipeline and a subcooling pipeline. The enthalpy-increasing pipeline is connected to the enthalpy-increasing port of the compressor and is equipped with an enthalpy-increasing control valve. The subcooling pipeline is connected to the gas-liquid separator and is equipped with a subcooling control valve. The control device for an air conditioning system as described in claim 8 is electrically connected to the compressor, the throttling device, the enthalpy control valve, and the subcooling control valve.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are executed, they cause the computer to perform the control method for an air conditioning system as described in any one of claims 1 to 7.

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