air conditioning system

Abstract

This invention provides an air conditioning system, including outdoor and indoor units. The indoor unit includes an indoor heat exchanger, gas-side and liquid-side throttling elements, and a processing device. The system is configured to: drive the liquid-side throttling element into a conducting state; based on the operating mode corresponding to the switching valve's working state, generate an adjustment amount for the opening of the gas-side throttling element according to the degree to which the superheat of the indoor heat exchanger deviates from the target superheat, or the degree to which the condensing temperature deviates from the target condensing temperature; and generate the target opening of the gas-side throttling element for the current adjustment cycle based on the target opening of the previous adjustment cycle and the adjustment amount for the gas-side throttling element opening; wherein the adjustment degree corresponding to the gas-side throttling element opening adjustment amount is positively correlated with the degree of deviation. This invention significantly improves the flexibility and overall performance of the air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0002] The refrigerant R410A used in the air conditioning industry has a GWP (Global Greenhouse Potential) of 2088, which is a type of HFC with a strong greenhouse effect. It needs to be replaced by new environmentally friendly low-GWP refrigerants, such as R32 and R454B. These refrigerants have lower GWPs and their cooling performance is comparable to that of R410A.

[0003] However, these refrigerants are all weakly flammable. When exposed to open flames or electrical sparks, they pose a risk of combustion and explosion within certain concentration ranges. Therefore, when the refrigerant charge in an air conditioning system exceeds a certain value, one or two safety measures must be taken, such as ventilation, alarms, and shut-off valves. Closing the shut-off valve can limit refrigerant leakage into the room. The shut-off valve is installed on the gas and liquid lines connecting the indoor unit and the outdoor unit, and is generally an electronic expansion valve. When a refrigerant leak occurs, the shut-off valve closes, cutting off the flow path and preventing more refrigerant from entering the room through the indoor unit, thus avoiding a refrigerant concentration in the room that reaches a flammable level.

[0004] However, existing safety shut-off devices are only used as emergency devices after refrigerant leakage. They are all in the fully open state during normal operation and do not make full use of the characteristics of their throttling elements to participate in the normal control of the air conditioning system. This results in a single component of the existing air conditioning system controlling multiple target parameters, which often causes the air conditioning system to deviate from the design state. Problems such as excessive input load leading to increased energy consumption or insufficient input load leading to poor comfort may occur. Summary of the Invention

[0005] This invention addresses the problem that existing safety shut-off devices are only used as emergency devices after refrigerant leakage, and are always fully open during normal operation, failing to fully utilize the characteristics of their throttling elements. This invention designs and provides an air conditioning system.

[0006] An air conditioning system includes: an outdoor unit including a switching valve for determining the flow direction of refrigerant; and an indoor unit including: an indoor heat exchanger; a gas-side throttling element; and a liquid-side throttling element.

[0007] In one or more embodiments of this application, the air conditioning system further includes: a processing device configured to: drive the liquid-side throttling element to a conducting state; based on the operating mode corresponding to the working state of the switching valve, generate an adjustment amount for the opening of the gas-side throttling element according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature, and generate a target opening of the gas-side throttling element for the current adjustment period based on the target opening of the previous adjustment period and the adjustment amount of the gas-side throttling element opening; wherein the adjustment degree corresponding to the adjustment amount of the gas-side throttling element opening is positively correlated with the degree of deviation.

[0008] In one or more embodiments of this application, the processing device is configured to generate, in cooling mode, an adjustment amount of the opening of the gas-side throttling element based on the degree to which the superheat of the indoor heat exchanger deviates from the target superheat, and to generate a target opening of the gas-side throttling element for the current adjustment period based on the sum of the target opening of the previous adjustment period and the adjustment amount of the opening of the gas-side throttling element.

[0009] In one or more embodiments of this application, the processing device is configured to, in heating mode, generate an adjustment amount for the opening of the gas-side throttling element based on the degree to which the condensing temperature of the indoor heat exchanger deviates from the target condensing temperature, and generate a target opening of the gas-side throttling element for the current adjustment period based on the sum of the target opening of the previous adjustment period and the adjustment amount for the opening of the gas-side throttling element.

[0010] In one or more embodiments of this application, the processing device is further configured to generate the gas-side throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of deviation of the superheat; or to generate the gas-side throttling element opening adjustment amount based on the degree of deviation of the condensing temperature of the indoor heat exchanger from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature.

[0011] In one or more embodiments of this application, the processing device is further configured to generate the air-side throttling element opening adjustment amount in a cooling mode based on the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of superheat deviation.

[0012] In one or more embodiments of this application, the processing device is further configured to generate the opening adjustment amount of the gas-side throttling element based on the degree of deviation of the condensing temperature of the indoor heat exchanger from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature in heating mode.

[0013] In one or more embodiments of this application, the outdoor unit further includes a compressor and an outdoor heat exchanger.

[0014] In one or more embodiments of this application, the processing device is further configured to generate a frequency adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree to which the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger deviates from the target evaporation temperature, and generate a compressor target operating frequency for the current adjustment period based on the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount; wherein the adjustment degree corresponding to the frequency adjustment amount is proportional to the degree of deviation of the evaporation temperature.

[0015] In one or more embodiments of this application, the processing device is further configured to generate a frequency adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree of deviation of the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature, and to generate the target operating frequency of the current adjustment period based on the sum of the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount.

[0016] In one or more embodiments of this application, the processing device is further configured to: in a cooling mode, generate multiple frequency adjustment quantities based on the degree of deviation of the evaporation temperature of multiple indoor heat exchangers from the target evaporation temperature, and generate the target operating frequency of the current adjustment period based on the weighted average of the multiple frequency adjustment quantities and the sum of the compressor target operating frequency of the previous adjustment period.

[0017] In one or more embodiments of this application, the indoor unit further includes an indoor throttling element.

[0018] In one or more embodiments of this application, the processing device is further configured to: generate an indoor throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree to which the evaporation temperature of the indoor heat exchanger deviates from the target evaporation temperature, or the degree to which the subcooling of the indoor heat exchanger deviates from the target subcooling, and generate an indoor throttling element target opening amount for the current adjustment period based on the indoor throttling element target opening amount of the previous adjustment period and the indoor throttling element opening adjustment amount; wherein the adjustment degree corresponding to the throttling element opening adjustment amount is positively correlated with the degree of evaporation temperature deviation, or positively correlated with the degree of subcooling deviation.

[0019] In one or more embodiments of this application, the processing device is further configured to: generate an indoor throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree of deviation of the indoor heat exchanger's evaporation temperature from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature; or generate an indoor throttling element opening adjustment amount based on the degree of deviation of the indoor heat exchanger's subcooling from the target subcooling and the degree of subcooling deviation.

[0020] In one or more embodiments of this application, the gas-side throttling element is connected to the gas pipe of one or more indoor heat exchangers.

[0021] In one or more embodiments of this application, the liquid-side throttling element is connected to the liquid pipe of one or more indoor heat exchangers.

[0022] The processing device is configured to: drive the liquid-side throttling element to be in a conducting state; based on the operating mode corresponding to the working state of the switching valve, generate an adjustment amount for the opening of the gas-side throttling element according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature; and generate the target opening of the gas-side throttling element for the current adjustment period based on the target opening of the previous adjustment period and the average or maximum value of the adjustment amount of the gas-side throttling element opening; wherein the adjustment degree corresponding to the adjustment amount of the gas-side throttling element opening is positively correlated with the degree of deviation.

[0023] This application improves the control accuracy and efficiency of the air conditioning system by introducing a processing device to dynamically adjust the opening of the liquid-side and gas-side throttling elements. Compared to the previous design that only used them as shut-off valves, by adjusting according to the degree of deviation of superheat or condensing temperature, the air conditioning system is ensured to remain stable under different operating conditions and adapt to multiple operating modes, significantly improving the flexibility and overall performance of the air conditioning system.

[0024] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of an air conditioning system provided in one or more embodiments of the present invention;

[0027] Figure 2 A schematic diagram of the structure of an air conditioning system provided in one or more embodiments of the present invention;

[0028] Figure 3 A schematic diagram of the structure of an air conditioning system provided in one or more embodiments of the present invention;

[0029] Figure 4 A schematic diagram of the structure of an air conditioning system provided in one or more embodiments of the present invention;

[0030] Figure 5 A schematic diagram of the structure of a processing device in an air conditioning system provided by one or more embodiments of the present invention;

[0031] Figure 6 Here is an example of how condensation temperature changes over time;

[0032] Figure 7 Here is an example of how evaporation temperature changes over time;

[0033] Figure 8 Here is an example of frequency changing over time;

[0034] Figure 9 Here is an example of frequency changing over time;

[0035] Figure 10 Here is an example of how condensation temperature changes over time;

[0036] Figure 11 Here is an example of how evaporation temperature changes over time;

[0037] Figure 12 Here is an example of frequency changing over time;

[0038] Figure 13 Here is an example of frequency changing over time;

[0039] Figure 14 A schematic diagram of the structure of an air conditioning system provided in one or more embodiments of the present invention;

[0040] In the picture:

[0041] 101. Outdoor unit; 1. Compressor; 2. Oil separator; 2'. Check valve; 3. Gas-liquid separator; 4. Switching valve; 5. Outdoor fan; 6. Outdoor heat exchanger; 7. Outdoor throttling element; 8. Liquid pipe shut-off valve; 9. Gas pipe shut-off valve; 21. Exhaust pressure sensor; 27. Outdoor unit temperature sensor; 102. Liquid pipe; 103. Gas pipe;

[0042] 20. Processing device; 201. Processor; 202. Non-volatile memory; 203. Volatile memory; 204. Display device; 205. Operating device; 206. Communication interface; 207. Drive device; 208. Bus; 209. Storage medium; 210. Storage medium;

[0043] 301. Indoor unit; 11. Liquid-side throttling element; 12. Indoor throttling element; 13. Indoor heat exchanger; 14. Indoor fan; 15. Gas-side throttling element; 23. Indoor unit liquid pipe temperature sensor; 24. Indoor unit gas pipe temperature sensor; 28. Indoor unit pressure sensor;

[0044] 302. Indoor unit; 16. Liquid-side throttling element; 17. Indoor throttling element; 18. Indoor heat exchanger; 19. Indoor fan; 20. Gas-side throttling element; 25. Indoor unit liquid pipe temperature sensor; 26. Indoor unit gas pipe temperature sensor; 29. ​​Indoor unit pressure sensor;

[0045] 401. Liquid-side throttling element; 402. Gas-side throttling element. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and letters may be repeated in different examples; this repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and the use of other materials.

[0052] Hereinafter, one or more embodiments of this application will be described in detail with reference to the accompanying drawings.

[0053] Figure 1 This diagram illustrates the structure of an air conditioning system provided by one or more specific embodiments of the present invention.

[0054] The air conditioning system provided in this application is a multi-split system. A multi-split system is an air conditioning system that can independently heat or cool multiple rooms or zones, and the temperature of each room or zone can be controlled independently or in combination. Multi-split air conditioning systems are particularly suitable for buildings that require independent temperature control and include multiple rooms or zones, such as office buildings, schools, hotels, and large residences.

[0055] Multi-split air conditioning systems integrate a refrigeration cycle. This cycle utilizes a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle comprises a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0056] From a principle perspective, low-temperature, low-pressure refrigerant enters compressor 1, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser, where the condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0057] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device and returns the low-temperature, low-pressure refrigerant to compressor 1. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning system regulates the temperature of the indoor space.

[0058] In one or more embodiments of this application, the air conditioning system includes an outdoor unit 101 and an indoor unit connected to each other.

[0059] In one or more embodiments of this application, the air conditioning system includes an outdoor unit 101 and two indoor units connected to each other, as shown in figures 301 and 302. However, the number of indoor units is not particularly limited in this application. More or fewer indoor units can be arranged in an air conditioning system in the same manner as the indoor units shown in the figures.

[0060] The outdoor unit 101 and the indoor unit are connected by a liquid pipe 102 and a gas pipe 103. The liquid pipe 102 and the gas pipe 103 are used to supply refrigerant flow, so that the refrigerant can form a refrigerant circuit and circulate in it.

[0061] In one or more embodiments of this application, a liquid pipe shut-off valve 8 is provided on the liquid pipe 102.

[0062] In one or more embodiments of this application, an airway shut-off valve 9 is provided on the airway 103.

[0063] The basic structure and function of outdoor unit 101 are described below. When using the same system architecture, the number of outdoor units 101 in the air conditioning system can be expanded to multiple units, which can then operate in groups. The throttling device includes an outdoor electronic expansion valve 7, and outdoor units 101 are correspondingly configured with outdoor electronic expansion valves 7.

[0064] In one or more embodiments of this application, the outdoor unit 101 is part of the refrigeration cycle that includes the compressor 1 and the outdoor heat exchanger 6. The outdoor unit 101 can perform heating or cooling operation on the outdoor side to provide energy to the indoor unit for raising or lowering the indoor temperature.

[0065] In one or more embodiments of this application, an oil separator 2 is also provided in the outdoor unit 101. The function of the oil separator 2 in the air conditioning system is to separate lubricating oil and refrigerant. Since the compressor 1 requires lubricating oil to reduce friction and wear to ensure normal operation, the lubricating oil mixes with the refrigerant during compressor 1 operation. The oil separator 2 separates the lubricating oil from the refrigerant using a physical separation principle (e.g., centrifugal force or gravity). The separated lubricating oil is recovered and recycled, while the refrigerant continues to flow. The oil separator 2 is equipped with a one-way valve 2'.

[0066] In one or more embodiments of this application, a gas-liquid separator 3 is further provided in the outdoor unit 101. The gas-liquid separator 3 is based on the density difference between gas and liquid. When a refrigerant containing a mixture of gas and liquid enters the gas-liquid separator 3, the denser liquid refrigerant sinks due to gravity, while the less dense gas rises. In this way, the gas-liquid separator 3 can effectively separate liquid and gaseous refrigerant. The gas-liquid separator 3 is located on the suction side of the compressor 1, and it can also store excess refrigerant.

[0067] In one or more embodiments of this application, the outdoor unit 101 is further provided with a switching valve 4, which is typically a four-way valve. It enables the air conditioning system to switch between cooling mode and heating mode by determining the flow direction of the refrigerant.

[0068] In one or more embodiments of this application, an outdoor fan 5 is further provided in the outdoor unit 101. The rotation speed of the outdoor fan 5 can be controlled to change the flow rate of air exchanging heat with the outdoor heat exchanger 6 by adjusting the rotation speed. The outdoor fan 5 can be an axial flow fan, a cross flow fan, or other optional fan types. The outdoor fan 5 is located near the outdoor heat exchanger 6.

[0069] In one or more embodiments of this application, the outdoor unit 101 is further provided with an exhaust pressure sensor 21 and an outdoor unit temperature sensor 27.

[0070] In one or more embodiments of this application, the air conditioning system further includes a liquid-side throttling element, as shown in Figures 11 and 16, and a gas-side throttling element, as shown in Figures 15 and 20. The liquid-side throttling element is disposed between the liquid piping on the outdoor unit side and the liquid piping on the indoor unit side, and the gas-side throttling element is disposed between the gas piping on the outdoor unit side and the gas piping on the indoor unit side.

[0071] In one or more embodiments of this application, the liquid-side throttling element is an electronic expansion valve.

[0072] In one or more embodiments of this application, the gas-side throttling element is an electronic expansion valve.

[0073] The structure and function of the indoor units are described below, using one indoor unit as an example. The following description also applies to other indoor units.

[0074] The indoor unit utilizes the energy generated by the outdoor unit 101 to either increase or decrease the indoor temperature for cooling or heating operation. The indoor unit includes a connected indoor heat exchanger, as shown in Figures 13 and 18, and indoor throttling elements, as shown in Figures 12 and 17, with the indoor heat exchanger and throttling element correspondingly positioned. The indoor throttling element is configured to reduce the refrigerant pressure and cause it to expand.

[0075] The indoor unit is also equipped with an indoor fan, as shown in Figures 14 and 19. The indoor fan can be an axial fan, a cross-flow fan, or other types of fan. The indoor fan is located close to the indoor heat exchanger.

[0076] The indoor unit is also equipped with an indoor unit liquid pipe temperature sensor, as shown in Figures 23 and 25.

[0077] The indoor unit is also equipped with an indoor unit gas pipe temperature sensor, as shown in Figures 24 and 26.

[0078] The indoor unit is also equipped with an indoor unit pressure sensor, as shown in Figures 28 and 29.

[0079] like Figure 2 As shown, during refrigeration operation, the D port of the switching valve (taking a four-way valve as an example) is connected to the C port, and the E port is connected to the S port. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor passes through the oil separator and the switching valve. The high-temperature and high-pressure gaseous refrigerant condenses into a high-temperature and high-pressure liquid refrigerant in the outdoor heat exchanger. The high-temperature and high-pressure liquid refrigerant condensed by the outdoor heat exchanger passes through the outdoor electronic expansion valve and the outdoor side liquid pipe shut-off valve and is divided into multiple paths (for example, two paths as shown in the figure).

[0080] The high-temperature, high-pressure liquid refrigerant in the first part passes sequentially through the liquid-side throttling element 11 (in a conducting state, preferably fully open) and the indoor throttling element 12, throttling the high-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure refrigerant; the low-temperature, low-pressure refrigerant evaporates into a low-temperature, low-pressure gaseous refrigerant in the indoor heat exchanger 13, and the low-temperature, low-pressure gaseous refrigerant flows out after passing through the gas-side throttling element 15.

[0081] The high-temperature, high-pressure liquid refrigerant in the second part passes through the liquid-side throttling element 16 and the indoor throttling element 17 in sequence, throttling the high-temperature, high-pressure liquid refrigerant into a low-temperature, low-pressure refrigerant; the low-temperature, low-pressure refrigerant evaporates into a low-temperature, low-pressure gaseous refrigerant in the indoor heat exchanger 18, and the low-temperature, low-pressure gaseous refrigerant flows out after passing through the gas-side throttling element 20 in sequence.

[0082] After the outflowing low-temperature, low-pressure gaseous refrigerant merges, it flows into the gas-liquid separator 3 through the outdoor gas pipe shut-off valve 9 and the switching valve 4. The low-temperature, low-pressure gaseous refrigerant flows out from the gas-liquid separator 3 and enters the suction port of the compressor 1, thus completing the refrigeration operation.

[0083] like Figure 3 As shown, during heating operation, the D port of the switching valve (taking a four-way valve as an example) is connected to the E port, and the C port is connected to the S port. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor is divided into multiple paths after passing through the oil separator, the switching valve, and the outdoor gas pipe shut-off valve.

[0084] The high-temperature, high-pressure liquid refrigerant in the first part passes through the gas-side throttling element 15 and condenses into a high-temperature, high-pressure liquid refrigerant in the indoor heat exchanger 13. The high-temperature, high-pressure liquid refrigerant then flows out through the indoor throttling element 12 and the liquid-side throttling element 11 in sequence.

[0085] The high-temperature, high-pressure liquid refrigerant in the second part passes through the gas-side throttling element 20 and condenses into a high-temperature, high-pressure liquid refrigerant in the indoor heat exchanger 18. The high-temperature, high-pressure liquid refrigerant then flows out through the indoor throttling element 17 and the liquid-side throttling element 16 in sequence.

[0086] The outflowing liquid refrigerant flows out from the outdoor liquid pipe shut-off valve 8, and is throttled by the outdoor throttling element 7 into a low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant evaporates into a low-temperature, low-pressure gaseous refrigerant in the outdoor heat exchanger 6. The low-temperature, low-pressure gaseous refrigerant passes through the switching valve 4 and the gas-liquid separator 3 in sequence, and enters the suction port of the compressor 1, thus completing the heating operation.

[0087] like Figure 4 As shown, in one or more embodiments of this application, the air conditioning system further includes a processing device 20.

[0088] Figure 5 This is a schematic block diagram of the hardware configuration of the processing device 20. The processing device 20 includes components such as a processor 201, volatile memory 202, non-volatile memory 203, a display device 204, an operation device 205, a communication interface 206, and a drive device 207, which are interconnected via a bus 208. The processor can be a dedicated processor, a central processing unit, etc. The processor can access the storage unit to execute instructions or application programs stored in the storage unit to achieve related functions. The display device is used to display various information. The operation device is used to receive various operations. The drive device is a hardware terminal that interacts with the storage medium. In one or more embodiments of this application, the storage medium includes media such as CD-ROM, floppy disk, and optical-magnetic-optical disk that record information in an optical, electrical, or magnetic manner, as shown in Figure 209. The storage medium can also be a semiconductor memory such as ROM or flash memory that records information in a point-and-click manner, as shown in Figure 210.

[0089] The processing device 20 can be an outdoor controller in the outdoor unit 101 of the air conditioning system, or an indoor controller in the indoor unit, such as an on-board system based on an MCU.

[0090] The functions of the processing device 20 will be described below.

[0091] The processing device 20 is configured to drive the liquid-side throttling element to the on state; based on the operating mode corresponding to the working state of the switching valve 4, it generates an opening adjustment amount according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature, and generates the target opening of the gas-side throttling element for the current adjustment cycle based on the target opening and the opening adjustment amount of the previous adjustment cycle; wherein the adjustment degree corresponding to the opening adjustment amount is positively correlated with the degree of deviation.

[0092] This application improves the control accuracy and efficiency of the air conditioning system by introducing a processing device 20 to dynamically adjust the opening of the liquid-side throttling element and the gas-side throttling element. Compared with the previous design that only used it as a shut-off valve, by adjusting it according to the degree of deviation of superheat or condensing temperature, it ensures that the air conditioning system remains stable under different operating conditions and adapts to multiple operating modes, significantly improving the flexibility and overall performance of the air conditioning system.

[0093] In one or more embodiments of this application, in cooling mode, the processing device 20 is configured to generate an opening adjustment amount based on the degree to which the superheat of the indoor heat exchanger deviates from the target superheat side, and to generate the target opening of the gas-side throttling element for the current adjustment period based on the sum of the target opening and the opening adjustment amount of the previous adjustment period.

[0094] Taking indoor unit 301 as an example, during the operation of the air conditioning system, the processing device 20 is configured to drive the liquid-side throttling element 11 into a conducting state, for example, a fully open state. The opening degree of the liquid-side throttling element 11 is denoted as K. liq Then we have K liq =K max .

[0095] In cooling mode, the superheat SH of the indoor heat exchanger is controlled by adjusting the opening of the gas-side throttling element 15.

[0096] The superheat SH1 of indoor heat exchanger 13 is based on the detection value T of indoor unit liquid pipe temperature sensor 23. l1 The detected value T of the indoor unit gas pipe temperature sensor 24 g1 The superheat SH1 of indoor heat exchanger 13 satisfies: SH1 = T g1 -T l1 Similarly, the superheat of the indoor heat exchanger 18 is based on the detection value T of the indoor unit liquid pipe temperature sensor 25. l2The detected value T of the indoor unit gas pipe temperature sensor 26 g2 We obtain the following condition: SH2 = T g2 -T l2 If there are more indoor heat exchangers, the superheat calculation method is similar; the superheat SH of the indoor heat exchangers... i Satisfy: SH i =T gi -T li , where i represents the ordinal number of the indoor heat exchanger, and i is a positive integer.

[0097] Taking one of the indoor units as an example, the opening adjustment amount is generated based on the degree to which the superheat of the indoor heat exchanger 13 deviates from the target superheat.

[0098] The opening adjustment amount of the air-side throttling element 15 in the nth adjustment cycle is denoted as ΔK. gas1 (n), then ΔK gas1 (n)=γ(SH1-SH O1 ); where SH O1 Let SH be the target superheat of indoor heat exchanger 15. Similarly, the target superheat of the i-th indoor heat exchanger is denoted as SH. Oi The target superheat can be generated based on the set temperature of the air-conditioned room or other similar parameters. The target superheat can be generated using algorithms disclosed in the prior art, which are not the focus of this invention and will not be elaborated here.

[0099] In cooling mode, an example of calculating ΔKgas1(n) is shown in the table below:

[0100] <![CDATA[SH1-SH O1 ]]> -N ... -3 -2 -1 0 <![CDATA[ΔK gas1 (n)]]> <![CDATA[γ N (SH1-SH O1 )]]> ... <![CDATA[γ3(SH1-SH O1 )]]> <![CDATA[γ2(SH1-SH O1 )]]> <![CDATA[γ1(SH1-SH O1 )]]> 0 <![CDATA[SH1-SH O1 ]]> N ... 3 2 1 0 <![CDATA[ΔK gas1 (n)]]> <![CDATA[γ N (SH1-SH O1 )]]> ... <![CDATA[γ3(SH1-SH O1 )]]> <![CDATA[γ2(SH1-SH O1 )]]> <![CDATA[γ1(SH1-SH O1 )]]> 0

[0101] Among them, Y N >…>Y3>Y2>Y1>0, which are constants and can be pre-configured and stored.

[0102] Then, the target opening K of the air-side throttling element in the current regulation cycle can be calculated. gaso1 (n)

[0103] K gaso1 (n) satisfies:

[0104] K gaso1 (n)=K gaso1 (n-1)+ΔK gas1 (n).

[0105] Similarly, there is also K. gasoi (n)=K gasoi (n-1)+ΔK gasi (n).

[0106] In one or more embodiments of this application, in heating mode, the processing device 20 is further configured to generate an opening adjustment amount based on the degree to which the condensing temperature of the indoor heat exchanger deviates from the target condensing temperature, and to generate the target opening of the gas-side throttling element for the current adjustment period based on the target opening and the sum of the opening adjustment amount of the previous adjustment period.

[0107] In heating mode, the opening degree of the gas-side throttling element is affected by the condensing temperature T of the indoor heat exchanger. ci With the target condensation temperature T ci，o The difference control is applied. The condensing temperature of the indoor heat exchanger can be obtained by detecting the value of the indoor unit pressure sensor installed in the indoor unit, i.e., the saturation temperature corresponding to the pressure sensor detection value. The target condensing temperature can be generated based on the set temperature of the air-conditioned room or other similar parameters. The algorithm for generating the target condensing temperature can be disclosed in the prior art, which is not the focus of this invention and will not be elaborated here. The target condensing temperature of each indoor unit can be the same or different.

[0108] Taking indoor heat exchanger 13 as an example, in heating mode, let's assume the opening adjustment amount in the nth adjustment cycle is denoted as ΔK. gas1 (n), then ΔK gas1 (n)=γ(T c1 -T c1，o ), where T c1 T is the condensing temperature of indoor heat exchanger 13. c1，o This is the target condensing temperature for indoor heat exchanger 13; if there are more indoor heat exchangers, the condensing temperature and target condensing temperature are expressed in a similar way.

[0109] Calculate ΔK in heating mode. gas An example of (n) is shown in the table below:

[0110]

[0111]

[0112] Among them, Y N >…>Y3>Y2>Y1>0, which are constants and can be pre-configured and stored.

[0113] Then, the target opening K of the air-side throttling element in the current regulation cycle can be calculated. gaso1 (n)

[0114] K gaso1 (n) satisfies:

[0115] K gaso1 (n)=K gaso1 (n-1)+ΔK gas1 (n).

[0116] Similarly, there is also K. gasoi (n)=K gasoi (n-1)+ΔK gasi (n).

[0117] The change in the condensing temperature of the indoor heat exchanger directly affects the heating effect in the room. The curve showing the change in the condensing temperature of the indoor heat exchanger is shown below. Figure 6 As shown.

[0118] In one or more embodiments of this application, the processing device 20 is configured to generate a frequency adjustment amount based on the operating mode corresponding to the working state of the switching valve 4, according to the degree to which the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger deviates from the target evaporation temperature, and generate the compressor target operating frequency for the current adjustment period based on the compressor target operating frequency and the frequency adjustment amount of the previous adjustment period; wherein the adjustment degree corresponding to the frequency adjustment amount is proportional to the degree of deviation of the evaporation temperature.

[0119] In one or more embodiments of this application, in cooling mode, the processing device 20 is configured to generate a frequency adjustment amount based on the degree to which the evaporation temperature of the indoor heat exchanger deviates from the target evaporation temperature, and to generate the compressor target operating frequency for the current adjustment period based on the compressor target operating frequency and the frequency adjustment amount of the previous adjustment period.

[0120] Taking indoor heat exchanger 13 as an example, the evaporation temperature of indoor heat exchanger 13 is denoted as T. e1 The target evaporation temperature of the indoor heat exchanger is denoted as T. e1，o The frequency adjustment amount of indoor unit 301 in the nth adjustment cycle is denoted as ΔH1(n), then ΔH1(n) = α(T e1 -T e1，o The degree of frequency adjustment ΔH1(n) is directly proportional to the deviation of the evaporation temperature. When the deviation between the indoor heat exchanger's evaporation temperature and the target evaporation temperature is large, it indicates that the real-time compressor's operating frequency is deviating from equilibrium. In this case, the absolute value of the corresponding frequency adjustment ΔH1(n) is large, allowing the real-time compressor's operating frequency to reach equilibrium as quickly as possible. Conversely, when the deviation between the indoor heat exchanger's evaporation temperature and the target evaporation temperature is small, it indicates that the real-time compressor's operating frequency is close to equilibrium. In this case, the absolute value of the corresponding frequency adjustment ΔH1(n) is small, allowing the real-time compressor's operating frequency to reach equilibrium as quickly as possible with less impact. The trend of the indoor heat exchanger's evaporation temperature is as follows: Figure 7 As shown, the trend of the compressor's real-time operating frequency is as follows: Figure 8 As shown.

[0121] An example of calculating ΔH1(n) is shown in the table below:

[0122] <![CDATA[T e1 -T e1，o ]]> -N ... -3 -2 -1 0 <![CDATA[ΔH1(n)]]> <![CDATA[α N (T e1 -T e1，o )]]> ... <![CDATA[α3(T e1 -T e1，o )]]> <![CDATA[α2(T e1 -T e1，o )]]> <![CDATA[α1(T e1 -T e1，o )]]> 0 <![CDATA[T e1 -T e1o ]]> N ... 3 2 1 0 <![CDATA[ΔH1(n)]]> <![CDATA[α N (T e1 -T e1，o )]]> ... <![CDATA[α3(T e1 -T e1，o )]]> <![CDATA[α2(T e1 -T e1，o )]]> <![CDATA[α1(T e1 -T e1，o )]]> 0

[0123] Where, α N >…>α3>α2>α1>0, which are constants and can be pre-configured.

[0124] In one or more embodiments of this application, the processing device 20 is further configured to generate multiple frequency adjustment quantities in a cooling mode based on the degree of deviation of the evaporation temperature of multiple indoor heat exchangers from the target evaporation temperature, and to generate the target operating frequency of the current adjustment cycle based on the weighted average of the multiple frequency adjustment quantities and the sum of the compressor target operating frequency of the previous adjustment cycle.

[0125] Taking indoor heat exchangers 13 and 18 as examples, the frequency adjustment amount ΔH1(n) of indoor unit 301 and the frequency adjustment amount ΔH2(n) of indoor unit 302 can be calculated using the above formula. Furthermore, the weighted average of multiple frequency adjustment amounts can be calculated, which satisfies:

[0126] ΔH(n)=(ΔH1(n)×HP1+ΔH2(n)×HP2) / (HP1+HP2);

[0127] HP1 and HP2 represent the capacities of the indoor unit and the indoor unit, respectively.

[0128] The compressor target operating frequency for the current adjustment period is generated based on the compressor target operating frequency and frequency adjustment amount of the previous adjustment period.

[0129] The compressor operating frequency in the current adjustment cycle satisfies:

[0130] H O (n)=H O (n-1)+ΔH(n).

[0131] In one or more embodiments of this application, the processing device 20 is further configured to, in heating mode, generate a frequency adjustment amount based on the degree to which the evaporation temperature of the outdoor heat exchanger 6 deviates from the target evaporation temperature, and generate a compressor target operating frequency for the current adjustment period based on the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount. The evaporation temperature of the outdoor heat exchanger 6 is detected by the outdoor unit temperature sensor 27.

[0132] The evaporation temperature of outdoor heat exchanger 6 is denoted as T. e The target evaporation temperature of outdoor heat exchanger 6 is denoted as T. e，o Let ΔH(n) be the frequency adjustment amount in the nth adjustment cycle, then we have ΔH(n) = α(T) e -T e，oWhen the deviation between the evaporation temperature of outdoor heat exchanger 6 and the target evaporation temperature is large, it indicates that the real-time compressor operating frequency deviates from the equilibrium state. In this case, the absolute value of the corresponding frequency adjustment ΔH(n) is large, allowing the real-time compressor operating frequency to reach the equilibrium state as quickly as possible. Conversely, when the deviation between the evaporation temperature of outdoor heat exchanger 6 and the target evaporation temperature is small, it indicates that the real-time compressor operating frequency is close to the equilibrium state. In this case, the absolute value of the corresponding frequency adjustment ΔH(n) is small, allowing the real-time compressor operating frequency to reach the equilibrium state as quickly as possible with less impact. The trend of the compressor's real-time operating frequency is as follows: Figure 9 As shown.

[0133] An example of calculating ΔH(n) is shown in the table below:

[0134] <![CDATA[T e -T e，o ]]> -N ... -3 -2 -1 0 ΔH(n) <![CDATA[α N (T e -T e，o )]]> ... <![CDATA[α3(T e -T e，o )]]> <![CDATA[α2(T e -T e，o )]]> <![CDATA[α1(T e -T e，o )]]> 0 <![CDATA[T e1 -T e1，o ]]> N ... 3 2 1 0 ΔH(n) <![CDATA[α N (T e -T e，o )]]> ... <![CDATA[α3(T e -T e，o )]]> <![CDATA[α2(T e -T e，o )]]> <![CDATA[α1(T e -T e，o )]]> 0

[0135] Where, α N >…>α3>α2>α1>0, which are constants and can be pre-configured.

[0136] In one or more embodiments of this application, the processing device 20 is further configured to generate an indoor throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve 4, according to the degree of deviation of the indoor heat exchanger's evaporation temperature from the target evaporation temperature, or the degree of deviation of the indoor heat exchanger's subcooling from the target subcooling, and to generate the indoor throttling element target opening amount for the current adjustment period based on the indoor throttling element target opening amount and the indoor throttling element opening adjustment amount for the previous adjustment period; wherein the adjustment degree corresponding to the indoor throttling element opening adjustment amount is positively correlated with the degree of deviation of the evaporation temperature, or positively correlated with the degree of deviation of the subcooling.

[0137] In one or more embodiments of this application, the processing device 20 is further configured to generate an indoor throttling element opening adjustment amount in cooling mode based on the degree to which the evaporation temperature of the indoor heat exchanger deviates from the target evaporation temperature, and to generate a target indoor throttling element opening amount for the current adjustment period based on the target indoor throttling element opening amount and the indoor throttling element opening adjustment amount of the previous adjustment period. The adjustment degree corresponding to the throttling element opening adjustment amount is positively correlated with the degree of deviation of the evaporation temperature.

[0138] Taking the indoor heat exchanger as an example, the adjustment amount of the indoor throttling element opening in the nth adjustment cycle is denoted as ΔK1(n), then ΔK1(n) = β(T e1 -T e1，o The degree of adjustment of the indoor throttling element opening is positively correlated with the degree of deviation of the evaporation temperature.

[0139] An example of calculating ΔK1(n) is shown in the table below:

[0140] <![CDATA[T e1 -T e1，o ]]> -N ... -3 -2 -1 0 <![CDATA[ΔK1(n)]]> <![CDATA[β N (T e1 -T e1，o )]]> ... <![CDATA[β3(T e1 -T e1，o )]]> <![CDATA[β2(T e1 -T e1，o )]]> <![CDATA[β1(T e1 -T e1，o )]]> 0 <![CDATA[T e1 -T e1，o ]]> N ... 3 2 1 0 <![CDATA[ΔK1(n)]]> <![CDATA[β N (T e1 -T e1，o )]]> ... <![CDATA[β3(T e1 -T e1，o )]]> <![CDATA[β2(T e1 -T e1，o )]]> <![CDATA[β1(T e1 -T e1，o )]]> 0

[0141] Where, β N >…>β3>β2>β1>0, which are constants and can be pre-configured.

[0142] In one or more embodiments of this application, the processing device 20 is further configured to generate an indoor throttling element opening adjustment amount in heating mode based on the degree to which the subcooling of the indoor heat exchanger deviates from the target subcooling, and to generate the target opening of the indoor throttling element for the current adjustment period based on the target opening of the indoor throttling element and the indoor throttling element opening adjustment amount of the previous adjustment period. The adjustment degree corresponding to the throttling element opening adjustment amount is positively correlated with the degree of subcooling deviation.

[0143] In heating mode, the subcooling degree SC of the indoor heat exchanger is controlled by the opening degree of the indoor throttling element.

[0144] The subcooling SC1 of the indoor heat exchanger 13 is based on the saturation temperature T corresponding to the indoor unit pressure sensor 28. C1 The detected value T of the indoor unit liquid pipe temperature sensor 23 l1 It is found that the subcooling SC1 of the indoor heat exchanger 13 satisfies SC1 = T C1 -T l1 Similarly, the subcooling SC2 of the indoor heat exchanger 13 is based on the saturation temperature T corresponding to the indoor unit pressure sensor 29. C2 The detected value T of the indoor unit liquid pipe temperature sensor 25 l2 Therefore, the subcooling SC2 of the indoor heat exchanger satisfies SC2 = T C2 -T l2 If there are more indoor heat exchangers, the subcooling is calculated similarly; the subcooling SC of the indoor heat exchanger is... i Satisfy: SC i =T Ci -T li , where i represents the ordinal number of the indoor heat exchanger, and i is a positive integer.

[0145] Taking one of the indoor units 301 as an example, the opening adjustment amount of the indoor throttling element 12 is generated according to the degree to which the subcooling of the indoor heat exchanger 13 deviates from the target subcooling.

[0146] The opening adjustment amount of the indoor throttling element 12 in the nth adjustment cycle is denoted as ΔK1(n). Then, ΔK1(n) = β(SC1 - SC o1 ); where SC o1 Let SC be the target subcooling of indoor heat exchanger 13, and SC be the target superheat of the i-th indoor heat exchanger. OiThe target subcooling can be generated based on the set temperature of the air-conditioned room or other similar parameters. The target subcooling can be generated using algorithms disclosed in the prior art, which are not the focus of this invention and will not be elaborated here.

[0147] In heating mode, an example of calculating ΔK1(n) is shown in the table below:

[0148] <![CDATA[SC1-SC O1 ]]> -N ... -3 -2 -1 0 <![CDATA[ΔK1(n)]]> <![CDATA[β N (SC1-SC O1 )]]> ... <![CDATA[β3(SC1-SC O1 )]]> <![CDATA[β2(SC1-SC O1 )]]> <![CDATA[β1(SC1-SC O1 )]]> 0 <![CDATA[SC1-SC O1 ]]> N ... 3 2 1 0 <![CDATA[ΔK1(n)]]> <![CDATA[β N (SC1-SC O1 )]]> ... <![CDATA[β3(SC1-SC O1 )]]> <![CDATA[β2(SC1-SC O1 )]]> <![CDATA[β1(SC1-SC O1 )]]> 0

[0149] Where, β N >…>β3>β2>β1>0, which are constants and can be pre-configured.

[0150] In one or more embodiments of this application, the processing device 20 is further configured to generate an adjustment amount of the gas-side throttling element opening based on the operating mode corresponding to the working state of the switching valve 4, according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of deviation of the superheat; or to generate an adjustment amount of the gas-side throttling element opening based on the degree of deviation of the condensing temperature of the indoor heat exchanger from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature.

[0151] In one or more embodiments of this application, the processing device 20 is configured to generate an air-side throttling element opening adjustment amount in a cooling mode based on the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of superheat deviation.

[0152] The adjustment amount of the air-side throttling element opening in the nth adjustment cycle is denoted as ΔK. gas1 (n), then we have:

[0153]

[0154] The above formula can also be simplified to:

[0155]

[0156] In the above two formulas, k, b, and w are constants, which can be positive or negative integers or positive or negative decimals, and can be set according to actual needs.

[0157] Calculate ΔK in cooling mode. gas1 An example of (n) is shown in the table below:

[0158]

[0159] Where, k M >...>k2>k1>0, b N >...>b2>b1>0, w MN >...>w M2 >w M1 >w MO wMN >...>w 2N >w 1N >w 0N , which is a constant and can be pre-configured.

[0160] In one or more embodiments of this application, the processing device 20 is configured to generate an adjustment amount of the gas-side throttling element opening based on the degree to which the condensing temperature of the indoor heat exchanger deviates from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature in heating mode.

[0161] The adjustment amount of the air-side throttling element opening in the nth adjustment cycle is denoted as ΔK. gas1 (n), then we have:

[0162]

[0163] The above formula can also be simplified to:

[0164]

[0165] In the above two formulas, k, b, and w are constants, which can be positive or negative integers or positive or negative decimals, and can be set according to actual needs.

[0166]

[0167]

[0168] Where, k M >...>k2>k1>0, b N >...>b2>b1>0, w MN >...>w M2 >w M1 >w MO w MN >...>w 2N >w 1N >w 0N , which is a constant and can be pre-configured.

[0169] Changes in condensation temperature, such as Figure 10 As shown, this method can achieve more precise control of the opening degree, stabilize the condensing temperature area more quickly, and allow the room temperature to reach the target temperature quickly, making it more energy-efficient and comfortable.

[0170] In one or more embodiments of this application, the processing device 20 is further configured to: generate a frequency adjustment amount based on the operating mode corresponding to the working state of the switching valve 4, according to the degree of deviation of the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger 6 from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature, and generate the target operating frequency of the current adjustment period based on the sum of the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount.

[0171] In one or more embodiments of this application, in the cooling mode, the processing device 20 is configured to generate a frequency adjustment amount based on the degree to which the indoor heat exchanger evaporation temperature deviates from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature, and to generate the target operating frequency of the current adjustment period based on the sum of the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount.

[0172] Taking indoor unit 301 as an example, ΔH1(n) satisfies:

[0173]

[0174] The above formula can also be simplified to:

[0175]

[0176] In the above two formulas, δ, ε and θ are constants, which can be positive or negative integers or positive or negative decimals, and can be set according to actual needs.

[0177] In cooling mode, an example of calculating ΔH1(n) is shown in the table below:

[0178]

[0179]

[0180] Where, δ M >...>δ2>δ1>0, ε N >...>ε2>ε1>0, θ MN >...>θ M2 >θ M1 >θ MO θ MN >...>θ 2N >θ 1N >θ 0N , which is a constant and can be pre-configured.

[0181] like Figure 11 and Figure 12 As shown, in this method, the rate of change of evaporation temperature is incorporated into the target frequency control, so that the target frequency change does not overshoot and cause oscillation of evaporation temperature and frequency, thus stabilizing more quickly, resulting in greater energy savings and comfort.

[0182] In one or more embodiments of this application, in heating mode, the processing device 20 is configured to generate a frequency adjustment amount based on the degree to which the evaporation temperature of the outdoor heat exchanger 6 deviates from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature, and to generate the target operating frequency of the current adjustment period based on the sum of the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount.

[0183] ΔH(n) satisfies:

[0184]

[0185] The above formula can also be simplified to:

[0186]

[0187] In the above two formulas, δ, ε and θ are constants, which can be positive or negative integers or positive or negative decimals, and can be set according to actual needs.

[0188] An example of calculating ΔH(n) in heating mode is shown in the table below.

[0189]

[0190]

[0191] Where, δ M >...>δ2>δ1>0, ε N >...>ε2>ε1>0, θ MN >...>θ M2 >θ M1 >θ MO θ MN >...>θ 2N >θ 1N >θ 0N , which is a constant and can be pre-configured.

[0192] like Figure 13 As shown, the rate of change of evaporation temperature participates in the target frequency control, so that the target frequency change does not overshoot and cause oscillation of evaporation temperature and frequency, thereby enabling the frequency to reach the target frequency faster, resulting in greater energy saving and comfort.

[0193] In one or more embodiments of this application, the processing device 20 is further configured to: generate an indoor throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve 4, according to the degree of deviation of the evaporation temperature of the indoor heat exchanger from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature; or generate an indoor throttling element opening adjustment amount based on the degree of deviation of the subcooling of the indoor heat exchanger from the target subcooling and the degree of subcooling deviation.

[0194] In one or more embodiments of this application, in cooling mode, the processing device 20 generates an adjustment amount for the opening of the indoor throttling element based on the degree to which the evaporation temperature of the indoor heat exchanger deviates from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature.

[0195] Taking indoor unit 301 as an example, ΔK1(n) satisfies:

[0196]

[0197] The above formula can also be simplified to:

[0198]

[0199] In the above two formulas, v, μ and σ are constants, which can be positive or negative integers or positive or negative decimals, and can be set according to actual needs.

[0200] In cooling mode, an example of calculating ΔK1(n) is shown in the table below:

[0201]

[0202]

[0203] Among them, v M >...>v2>v1>0,μ N >...>μ2>μ1>0, σ MN >...>σ M2 >σ M1 >σ MO , σ MN >...>σ 2N >σ 1N >σ 0N , which is a constant and can be pre-configured.

[0204] In one or more embodiments of this application, in heating mode, the processing device 20 generates an adjustment amount for the opening of the indoor throttling element based on the degree to which the subcooling of the indoor heat exchanger deviates from the target subcooling and the degree of subcooling deviation.

[0205] Taking indoor unit 301 as an example, ΔK1(n) satisfies:

[0206]

[0207] The above formula can also be simplified to:

[0208]

[0209] In heating mode, an example of calculating ΔK1(n) is shown in the table below:

[0210]

[0211]

[0212] Among them, v M >...>v2>v1>0,μ N >...>μ2>μ1>0, σ MN >...>σM2 >σ M1 >σ MO , σ MN >...>σ 2N >σ 1N >σ 0N , which is a constant and can be pre-configured.

[0213] like Figure 14 As shown, in one or more embodiments of this application, an air conditioning system includes: an outdoor unit including a switching valve 4 for determining the flow direction of refrigerant; and multiple indoor units including: indoor heat exchangers.

[0214] In one or more embodiments of this application, the air conditioning system further includes: an air-side throttling element and a liquid-side throttling element; the air-side throttling element is connected to the gas pipe of one or more indoor heat exchangers; the liquid-side throttling element is connected to the liquid pipe of one or more indoor heat exchangers; the processing device 20 is configured to: drive the liquid-side throttling element to be in a conducting state; based on the operating mode corresponding to the working state of the switching valve 4, generate the air-side throttling element opening adjustment amount according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature, and generate the target opening of the air-side throttling element for the current adjustment period based on the average of the target opening and the air-side throttling element opening adjustment amount of the previous adjustment period, or the maximum value of the air-side throttling element opening adjustment amount; wherein the adjustment degree corresponding to the air-side throttling element opening adjustment amount is positively correlated with the deviation degree.

[0215] In this embodiment, each of the two indoor units is equipped with a gas-side throttling element 401 and a liquid-side throttling element 402, i.e., they share the gas-side throttling element 401 and the liquid-side throttling element 402. During cooling operation, the processing device 20 generates an adjustment amount for the opening of the gas-side throttling element based on the degree to which the superheat of the indoor heat exchanger deviates from the target superheat, and generates the target opening of the gas-side throttling element for the current adjustment period based on the average of the target opening and the adjustment amount of the gas-side throttling element opening in the previous adjustment period.

[0216] Right now:

[0217]

[0218] During heating operation, the processing device 20 generates the air-side throttling element opening adjustment amount according to the degree to which the indoor heat exchanger condensing temperature deviates from the target condensing temperature, and generates the target opening amount of the air-side throttling element for the current adjustment period based on the target opening amount of the previous adjustment period and the maximum value of the air-side throttling element opening adjustment amount.

[0219] Right now:

[0220] ΔKgas(n)=max(ΔKgas2 (n), ΔK gas3 (n))

[0221] Liquid-side and gas-side throttling elements can completely shut off in the event of refrigerant leakage, eliminating potential safety hazards.

[0222] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0223] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. Air conditioning system, including: The outdoor unit includes a switching valve for determining the direction of refrigerant flow; and Indoor unit, comprising: Indoor heat exchanger; Air-side throttling element; and Liquid-side throttling element; Its characteristic is that it further includes: The processing device is configured as follows: The liquid-side throttling element is driven into the conducting state; based on the operating mode corresponding to the working state of the switching valve, the opening adjustment amount of the gas-side throttling element is generated according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature; and the target opening of the gas-side throttling element for the current adjustment cycle is generated based on the target opening of the previous adjustment cycle and the opening adjustment amount of the gas-side throttling element; wherein the adjustment degree corresponding to the opening adjustment amount of the gas-side throttling element is positively correlated with the degree of deviation.

2. The air conditioning system according to claim 1, characterized in that, The processing device is further configured to: In cooling mode, the opening adjustment amount of the gas-side throttling element is generated according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, and the target opening of the gas-side throttling element for the current adjustment cycle is generated based on the sum of the target opening of the previous adjustment cycle and the opening adjustment amount of the gas-side throttling element. In heating mode, the opening adjustment amount of the gas-side throttling element is generated according to the degree to which the condensing temperature of the indoor heat exchanger deviates from the target condensing temperature, and the target opening amount of the gas-side throttling element for the current adjustment period is generated based on the sum of the target opening amount of the previous adjustment period and the opening adjustment amount of the gas-side throttling element.

3. The air conditioning system according to claim 1, characterized in that, The processing device is further configured to: Based on the operating mode corresponding to the working state of the switching valve, the opening adjustment amount of the gas-side throttling element is generated according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of deviation of the superheat; or the opening adjustment amount of the gas-side throttling element is generated according to the degree of deviation of the condensing temperature of the indoor heat exchanger from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature.

4. The air conditioning system according to claim 3, characterized in that, The processing device is further configured to: In cooling mode, the opening adjustment amount of the gas-side throttling element is generated based on the degree of deviation of the superheat of the indoor heat exchanger from the target superheat and the rate of change of the degree of superheat deviation. In heating mode, the opening adjustment amount of the gas-side throttling element is generated based on the degree to which the condensing temperature of the indoor heat exchanger deviates from the target condensing temperature and the rate of change of the degree of deviation of the condensing temperature.

5. The air conditioning system according to any one of claims 1 to 4, characterized in that, The outdoor unit also includes: a compressor and an outdoor heat exchanger; The processing device is further configured to generate a frequency adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree to which the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger deviates from the target evaporation temperature, and generate the compressor target operating frequency for the current adjustment period based on the compressor target operating frequency of the previous adjustment period and the frequency adjustment amount; wherein the adjustment degree corresponding to the frequency adjustment amount is proportional to the degree of deviation of the evaporation temperature.

6. The air conditioning system according to claim 5, characterized in that, The processing device is further configured to: Based on the operating mode corresponding to the working state of the switching valve, the frequency adjustment amount is generated according to the degree of deviation of the evaporation temperature of the indoor heat exchanger or the outdoor heat exchanger from the target evaporation temperature and the rate of change of the evaporation temperature deviation. The target operating frequency of the current adjustment cycle is generated based on the sum of the compressor target operating frequency of the previous adjustment cycle and the frequency adjustment amount.

7. The air conditioning system according to claim 5, characterized in that, The processing device is further configured to: In cooling mode, multiple frequency adjustment values ​​are generated based on the degree of deviation of the evaporation temperature of multiple indoor heat exchangers from the target evaporation temperature. The target operating frequency of the current adjustment cycle is generated based on the weighted average of the multiple frequency adjustment values ​​and the sum of the compressor target operating frequency of the previous adjustment cycle.

8. The air conditioning system according to any one of claims 1 to 4, characterized in that, The indoor unit also includes: Indoor throttling element; The processing device is further configured to: based on the operating mode corresponding to the working state of the switching valve, generate an indoor throttling element opening adjustment amount according to the degree of deviation of the indoor heat exchanger's evaporation temperature from the target evaporation temperature, or the degree of deviation of the indoor heat exchanger's subcooling from the target subcooling, and generate the indoor throttling element target opening amount for the current adjustment period based on the indoor throttling element target opening amount of the previous adjustment period and the indoor throttling element opening adjustment amount; wherein the adjustment degree corresponding to the throttling element opening adjustment amount is positively correlated with the degree of deviation of the evaporation temperature, or positively correlated with the degree of deviation of the subcooling.

9. The air conditioning system according to claim 8, characterized in that, The processing device is further configured to: generate an indoor throttling element opening adjustment amount based on the operating mode corresponding to the working state of the switching valve, according to the degree of deviation of the indoor heat exchanger's evaporation temperature from the target evaporation temperature and the rate of change of the degree of deviation of the evaporation temperature; or generate an indoor throttling element opening adjustment amount based on the degree of deviation of the indoor heat exchanger's subcooling from the target subcooling and the degree of subcooling deviation.

10. Air conditioning system, including: The outdoor unit includes a switching valve for determining the direction of refrigerant flow; and Multiple indoor units, including: Indoor heat exchanger; A gas-side throttling element, which connects to the gas pipes of one or more indoor heat exchangers; and Liquid-side throttling element, which connects to the liquid pipe of one or more indoor heat exchangers; Its characteristic is that it further includes: The processing device is configured as follows: The liquid-side throttling element is driven into the conducting state; based on the operating mode corresponding to the working state of the switching valve, the opening adjustment amount of the gas-side throttling element is generated according to the degree of deviation of the superheat of the indoor heat exchanger from the target superheat, or the degree of deviation of the condensing temperature from the target condensing temperature, and the target opening of the gas-side throttling element in the current adjustment cycle is generated based on the target opening of the previous adjustment cycle and the average or maximum value of the opening adjustment amount of the gas-side throttling element; wherein the adjustment degree corresponding to the opening adjustment amount of the gas-side throttling element is positively correlated with the degree of deviation.

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