A control method of an air conditioning system and an apparatus therefor

Abstract

The application relates to a control method of an air conditioning system and a related device thereof, and the system comprises: a first reversing element connected with a suction port of a compressor, a discharge port of the compressor, an indoor heat exchanger and a second reversing element; the second reversing element is connected with two outdoor heat exchangers and the suction port; a first on-off element is connected with the two outdoor heat exchangers and connected with the discharge port through a bypass pipeline; the indoor heat exchanger is connected with the two outdoor heat exchangers; when the air conditioning system is heating, if it is determined that one of the two outdoor heat exchangers needs to be defrosted, reversing control is performed on the first reversing element and the second reversing element, on-off control is performed on the first on-off element, the refrigerant flowing out of the discharge port is returned to the suction port through the indoor heat exchanger and the other outdoor heat exchanger to maintain heating, and the refrigerant flowing out of the discharge port is returned to the suction port through the bypass pipeline and the outdoor heat exchanger needing to be defrosted to realize defrosting. The application improves user comfort.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a control method for an air conditioning system and related equipment. Background Technology

[0002] When an air conditioning system is in heating mode, the outdoor heat exchanger gradually frosts up as it absorbs heat from the low-temperature outdoor air. The accumulation of frost reduces heat exchange efficiency, thus decreasing the system's heating capacity. Therefore, the outdoor heat exchanger needs to be defrosted periodically. Currently, defrosting the outdoor heat exchanger typically uses a reverse-cycle defrosting method. This involves switching the air conditioning system from heating to cooling mode via a four-way valve, allowing the high-temperature refrigerant discharged from the compressor to flow into the outdoor heat exchanger to melt the frost. However, during the outdoor heat exchanger defrosting process, the indoor heat exchanger becomes an evaporator, absorbing heat from the indoor air. To prevent cold air from blowing out and causing user discomfort, the indoor fan usually needs to be stopped. This results in a complete interruption of indoor heating during defrosting, causing significant fluctuations in indoor temperature. Users experience intermittent cooling sensations, severely impacting user comfort. Summary of the Invention

[0003] This application provides a control method for an air conditioning system and related equipment to solve the problem that defrosting in existing air conditioning systems affects user comfort.

[0004] In a first aspect, this application provides an air conditioning system, including: a compressor, an indoor heat exchanger, two outdoor heat exchangers, a first commutator, a second commutator, and a first switching element; The first commutator is connected to the air intake of the compressor, the air exhaust of the compressor, the indoor heat exchanger, and the second commutator, respectively. The second commutator is connected to both outdoor heat exchangers and the air intake, respectively; The first on / off element is connected to the two outdoor heat exchangers respectively, and the first on / off element is connected to the exhaust port through a bypass pipe; The indoor heat exchanger is connected to each of the two outdoor heat exchangers; When the air conditioning system is heating, if it is determined that one of the two outdoor heat exchangers needs to be defrosted, the refrigerant flowing out of the exhaust port is returned to the intake port through the indoor heat exchanger and the other outdoor heat exchanger to maintain heating, and the refrigerant flowing out of the exhaust port is returned to the intake port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

[0005] Secondly, this embodiment provides a control method for an air conditioning system, applied to the air conditioning system described above, the method comprising: Obtain the operating mode corresponding to the air conditioning system; When the operating mode is used to indicate that the air conditioning system is in heating mode, it is determined whether one of the two outdoor heat exchangers requires defrosting. When the outdoor heat exchanger that requires defrosting is present, the first and second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out of the compressor's exhaust port flows back to the compressor's suction port through the indoor heat exchanger and the outdoor heat exchanger that does not require defrosting to maintain heating, and the refrigerant flowing out of the exhaust port flows back to the suction port through the bypass pipe and the outdoor heat exchanger that requires defrosting to achieve defrosting.

[0006] Thirdly, this embodiment provides a control device for an air conditioning system, including: The acquisition module is used to acquire the corresponding operating mode of the air conditioning system. The determination module is used to determine whether there is an outdoor heat exchanger that needs to be defrosted when the operating mode is used to indicate that the air conditioning system is in heating mode. The control module is used to control the reversing of the first and second reversing components and the on / off of the first switching component when there is an outdoor heat exchanger that needs defrosting. This allows the refrigerant flowing from the compressor's exhaust port to flow back to the compressor's suction port via the indoor heat exchanger and the outdoor heat exchanger that does not need defrosting to maintain heating. It also allows the refrigerant flowing from the exhaust port to flow back to the suction port via a bypass pipe and the outdoor heat exchanger that needs defrosting to achieve defrosting.

[0007] Fourthly, this embodiment provides an air conditioning system, including: a processor and a memory; the processor is used to execute a control program for the air conditioning system stored in the memory to implement the control method for the air conditioning system as described above.

[0008] Fifthly, this embodiment provides a storage medium that stores one or more programs, which can be executed by one or more processors to implement the control method of the air conditioning system as described above.

[0009] Compared with the prior art, the technical solution provided in this application has the following advantages: The air conditioning system provided in this application includes: a compressor, an indoor heat exchanger, two outdoor heat exchangers, a first commutator, a second commutator, and a first switching element; the first commutator is connected to the compressor's suction port, the compressor's discharge port, the indoor heat exchanger, and the second commutator; the second commutator is connected to the two outdoor heat exchangers and the suction port; the first switching element is connected to the two outdoor heat exchangers and is connected via a bypass pipe. It is connected to the exhaust port; the indoor heat exchanger is connected to two outdoor heat exchangers respectively; wherein, when the air conditioning system is heating, if it is determined that one of the two outdoor heat exchangers needs to be defrosted, the refrigerant flowing out of the exhaust port is returned to the suction port through the indoor heat exchanger and the other outdoor heat exchanger to maintain heating, and the refrigerant flowing out of the exhaust port is returned to the suction port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting. In this embodiment, by setting two outdoor heat exchangers in the air conditioning system and configuring a first commutator, a second commutator, and a first on / off switch to control the refrigerant flow path, the refrigerant flowing from the compressor's exhaust port is controlled to flow back to the compressor's suction port via the indoor heat exchanger and the other outdoor heat exchanger to achieve continuous heating. The other refrigerant flows directly to the outdoor heat exchanger requiring defrosting via a bypass pipe and then back to the compressor's suction port to achieve defrosting. This allows the defrosting process to run in parallel with the heating process, avoiding the complete interruption of indoor heating and indoor temperature fluctuations caused by mode switching in existing reverse-cycle defrosting methods. This ensures continuous indoor heating during defrosting, improving user comfort. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0011] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0013] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of this application; Figure 2 A schematic diagram of an air conditioning system in cooling mode provided in an embodiment of this application; Figure 3 A schematic diagram of an air conditioning system in heating mode provided in an embodiment of this application; Figure 4 This is a schematic diagram of another air conditioning system in heating mode provided in an embodiment of this application; Figure 5 A schematic diagram of an air conditioning system during defrosting, provided as an embodiment of this application; Figure 6 A flowchart illustrating a control method for an air conditioning system provided in an embodiment of this application; Figure 7 A schematic diagram of the structure of a control device for an air conditioning system provided in an embodiment of this application; Figure 8 This is a schematic diagram of another air conditioning system provided in an embodiment of this application. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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.

[0015] The following disclosure provides numerous 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 scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0016] refer to Figure 1 , Figure 1 This is a schematic diagram of an air conditioning system provided in an embodiment of this application. The air conditioning system provided in this embodiment includes: a compressor 101, an indoor heat exchanger 102, two outdoor heat exchangers 103, a first commutator 104, a second commutator 105, a first on / off element 106, and a gas-liquid separator 113. The indoor heat exchanger 102 is connected to the two outdoor heat exchangers 103.

[0017] The first reversing element 104 is connected to the suction port of the compressor 101, the discharge port of the compressor 101, the indoor heat exchanger 102, and the second reversing element 105. The first reversing element 104 is essentially a four-way valve with four ports: one port connected to the suction port of the compressor 101, one port connected to the discharge port of the compressor 101, one port connected to the indoor heat exchanger 102, and one port connected to the second reversing element 105. By controlling the reversing of the first reversing element 104, the main flow direction of the refrigerant is changed. Specifically, one port is connected to the suction port of the compressor 101 through the gas-liquid separator 113.

[0018] The second reversing element 105 is connected to the suction ports of the two outdoor heat exchangers 103 and the compressor 101. The second reversing element 105 is essentially a four-way valve with four ports: one port is connected to one outdoor heat exchanger 103, one port is connected to the other outdoor heat exchanger 103, one port is connected to the suction port of the compressor 101, and one port is connected to one port of the first reversing element 104. By controlling the reversing of the second reversing element 105, the refrigerant inlet path and refrigerant flow path in the two outdoor heat exchangers 103 are changed. Specifically, one port is connected to the suction port of the compressor 101 through the gas-liquid separator 113.

[0019] The first shut-off element 106 is connected to two outdoor heat exchangers 103 respectively, and is also connected to the exhaust port of the compressor 101 via a bypass pipe 111. The first shut-off element 106 is actually a three-way valve with three ports: one port is connected to one outdoor heat exchanger 103, one port is connected to the other outdoor heat exchanger 103, and the other port is connected to the exhaust port of the compressor 101 via the bypass pipe 111. A bypass valve 1111 is installed on the bypass pipe 111. By controlling the bypass valve 1111, the flow of refrigerant in the bypass pipe 111 can be controlled. By controlling the on / off state of the first shut-off element 106, the high-temperature refrigerant flowing from the exhaust port can be introduced through the bypass pipe to the outdoor heat exchanger 103 that needs defrosting.

[0020] When the air conditioning system is heating, if it is determined that one of the two outdoor heat exchangers 103 needs to be defrosted, the refrigerant flowing out of the exhaust port is returned to the intake port through the indoor heat exchanger 102 and the other outdoor heat exchanger 103 to maintain heating by reversing the first reversing element 104 and the second reversing element 105 and turning the first on / off element 106 on / off.

[0021] Specifically, when the air conditioning system is in heating mode, the first commutator 104 is used for reversing control, so that the indoor heat exchanger 102 is connected to the exhaust port of the compressor 101 through the first commutator 104, and the suction port of the compressor 101 is connected to the second commutator 105 through the first commutator 104. If it is determined that one of the two outdoor heat exchangers 103 needs to be defrosted, the reversing direction of the first commutator 104 remains unchanged, and the reversing control of the second commutator 105 is performed, so that the suction port of the compressor 101 is connected to the outdoor heat exchanger 103 that needs to be defrosted through the second commutator 105, and the outdoor heat exchanger 103 that does not need to be defrosted is connected to the first commutator 104 through the second commutator 105. Furthermore, by controlling the on / off state of the first on / off element 106 and controlling the bypass valve 1111 to open, the outdoor heat exchanger 103 that needs to be defrosted is connected to the exhaust port of the compressor 101 through the bypass pipe 111, while the outdoor heat exchanger 103 that does not need to be defrosted is shut off from the bypass pipe 111.

[0022] Thus, when the air conditioning system is in heating mode, if it is determined that one of the two outdoor heat exchangers 103 needs defrosting, a portion of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 101 enters the outdoor heat exchanger 103 that needs defrosting directly through the bypass pipe 111 and the already connected first switch 106. The high-temperature refrigerant condenses and releases heat in the outdoor heat exchanger 103, melting the frost layer on its surface. The condensed liquid refrigerant returns to the compressor 101 suction port through the second reversing element 105, thereby completing defrosting using the high-temperature exhaust of the air conditioning system itself. At the same time, another portion of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 101 enters the indoor heat exchanger 102 through the first reversing element 104, condensing and releasing heat (maintaining heating). The condensed liquid refrigerant flows through the outdoor heat exchanger 103 that does not need defrosting, absorbs heat from the outdoor environment, evaporates into a gaseous state, and finally flows back to the compressor 101 suction port through the second reversing element 105, completing the heating cycle. This process enabled the air conditioning system to simultaneously heat and defrost.

[0023] In this embodiment, a heating device 107 is provided on the connecting pipe between the second reversing member 105 and the air intake; the heating device 107 is used to heat the refrigerant flowing out of the outdoor heat exchanger 103 that needs to be defrosted when defrosting the outdoor heat exchanger 103 that needs to be defrosted.

[0024] The heating device 107 is actually an electric heater. Specifically, it is installed on the connecting pipe between the second reversing element 105 and the gas-liquid separator 113. In the air conditioning system's simultaneous heating and defrosting operation mode, a portion of the high-temperature refrigerant flowing from the compressor 101's exhaust port enters the outdoor heat exchanger 103 requiring defrosting via the bypass pipe 111 and the first switching element 106. This portion of high-temperature refrigerant condenses and releases heat in the outdoor heat exchanger 103, melting the frost layer on the fin surface. During this process, the refrigerant gradually condenses from a high-temperature gaseous state to a liquid state or a gas-liquid two-phase state, with both its temperature and pressure decreasing. The low-temperature refrigerant, after flowing out of the outdoor heat exchanger 103 requiring defrosting, is switched by the second reversing element 105 and enters the pipe connected to the compressor 101's suction port. While flowing through this pipe, the heating device 107 is activated to heat the low-temperature refrigerant, raising its temperature to ensure that the liquid components in the refrigerant fully evaporate into a gaseous state. After being heated, the refrigerant enters the suction port of compressor 101 to participate in the next compression cycle, avoiding the risk of liquid slugging in compressor 101 caused by excessively low temperature or liquid components in the refrigerant returning during defrosting, and ensuring the operational reliability of compressor 101 during the defrosting process.

[0025] In this embodiment, the air conditioning system also includes a second switch 108, which is connected between two outdoor heat exchangers 103. In the air conditioning system, when the system is cooling, the refrigerant flowing out of the exhaust port is returned to the intake port through two outdoor heat exchangers 103 and indoor heat exchangers 102 connected in series by the reversing control of the first commutator 104 and the second commutator 105 and the on / off control of the first on / off element 106 and the second on / off element 108.

[0026] Specifically, the second on / off element 108 is actually a solenoid valve used to control whether the refrigerant pipeline between the two outdoor heat exchangers 103 is in a conducting or shut-off state. When the air conditioning system is cooling, by opening the second on / off element 108, the two outdoor heat exchangers 103 can be connected in series in the refrigerant flow path. When the air conditioning system is not cooling, the second on / off element 108 is closed, and the refrigerant pipeline between the two outdoor heat exchangers 103 is shut off.

[0027] During air conditioning system cooling, the first commutator 104 and the second commutator 105 are controlled to switch directions, connecting the exhaust port of compressor 101 to an outdoor heat exchanger 103 and the suction port of compressor 101 to an indoor heat exchanger 102. The second on / off element 108 is opened, allowing refrigerant to flow sequentially through the two outdoor heat exchangers 103. The first on / off element 106 is then closed, disconnecting the bypass pipe 111 from the two outdoor heat exchangers 103. Thus, the high-temperature, high-pressure gaseous refrigerant flowing from the exhaust port of compressor 101 first enters one outdoor heat exchanger 103 for condensation and heat dissipation. After partial condensation, the refrigerant flows through the opened second on / off element 108 and enters the other outdoor heat exchanger 103 for further condensation and heat dissipation. After being cooled in series by the two outdoor heat exchangers 103, the refrigerant is fully condensed into a liquid state and then flows to the indoor heat exchanger 102. In the indoor heat exchanger 102, the liquid refrigerant evaporates and absorbs heat to achieve a cooling effect. Finally, the gaseous refrigerant flows back to the suction port of the compressor 101 to complete the refrigeration cycle.

[0028] In this embodiment, by setting a second on / off element 108 between the two outdoor heat exchangers 103, the second on / off element 108 is controlled to be open in the cooling mode, so that the two outdoor heat exchangers 103 form a series condensation and heat dissipation path. This allows the high-temperature refrigerant flowing out of the compressor 101 exhaust port to pass through the two outdoor heat exchangers 103 in sequence for staged condensation and heat dissipation, increasing the condensation heat exchange area and extending the heat dissipation path of the refrigerant on the outdoor side. This makes the refrigerant condense more fully, resulting in a lower temperature of the liquid refrigerant entering the outdoor heat exchanger 103, thereby improving the energy efficiency and cooling effect in the cooling mode.

[0029] In this embodiment, a first flow regulator 109 is provided on the connecting pipe between the second reversing member 105 and each outdoor heat exchanger 103, and a second flow regulator 110 is provided on the connecting pipe between the indoor heat exchanger 102 and each outdoor heat exchanger 103. The inflow and outflow rates of each outdoor heat exchanger 103 are adjusted by controlling the first flow regulator 109 and the second flow regulator 110.

[0030] Specifically, both the first flow regulator 109 and the second flow regulator 110 are electronic expansion valves. By configuring independent flow regulators for each of the two outdoor heat exchangers 103, differentiated regulation of the refrigerant flow to the two outdoor heat exchangers 103 is achieved under different modes of the air conditioning system, ensuring that the indoor temperature can be maintained at the set temperature and improving user comfort.

[0031] It should be noted that a throttling valve 112 is installed on the refrigerant pipeline between the outdoor heat exchanger 103 and the two outdoor heat exchangers 103. The throttling valve 112 is located between the fourth flow regulator and the outdoor heat exchanger 103 and between the second flow regulator 110 and the outdoor heat exchanger 103, so as to throttle the refrigerant.

[0032] refer to Figures 1-5 The control flow of the air conditioning system under various modes is described in detail below. Referring to the attached diagrams, the right side of the two outdoor heat exchangers 103 is the first outdoor heat exchanger, and the left side is the second outdoor heat exchanger.

[0033] refer to Figure 2 When the air conditioning system is cooling, the bypass valve 1111, the first flow regulator 109 connected to the second outdoor heat exchanger 1, the first on / off element 106, and the second flow regulator 110 connected to the first outdoor heat exchanger are closed. The first flow regulator 109 connected to the first outdoor heat exchanger and the second flow regulator 110 connected to the second outdoor heat exchanger are opened to their maximum opening degree, the throttle valve 112 is opened, and the second on / off element 108 is turned on. The high-temperature and high-pressure refrigerant discharged from the compressor 101 first flows into the first outdoor heat exchanger through the first reversing element 104 and the second reversing element 105, and then enters the second outdoor heat exchanger through the second switching element 108. The two outdoor heat exchangers 103 are connected in series to complete condensation and heat release. After condensation, the liquid refrigerant is throttled and depressurized by the expansion valve 112 and then flows into the indoor heat exchanger 102 to evaporate and absorb heat, thus achieving indoor cooling. The refrigerant that has completed heat exchange flows into the gas-liquid separator 113 through the first reversing element 104 and finally flows back to the suction port of the compressor 101 to complete the complete refrigeration cycle.

[0034] refer to Figure 3When the air conditioning system is in heating mode and the probability of frosting is low (i.e., the air conditioning system is in parallel heating mode), the bypass valve 1111, the connecting valve and the first on / off element 106 remain closed, the throttle valve 112, the first flow regulator 109 connected to the second outdoor heat exchanger and the first flow regulator 109 connected to the first outdoor heat exchanger are all opened to the maximum degree, and the second flow regulator 110 connected to the first outdoor heat exchanger and the second flow regulator 110 connected to the second outdoor heat exchanger are opened simultaneously. The high-temperature, high-pressure refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 102 via the first reversing element 104, where it condenses and releases heat to provide heat for the room. After heat exchange, the refrigerant is divided into two paths via the throttle valve 112. One path flows into the first outdoor heat exchanger via the second flow regulating element 110 connected to the first outdoor heat exchanger for evaporation and heat absorption, while the other path flows into the second outdoor heat exchanger via the second flow regulating element 110 connected to the second outdoor heat exchanger for evaporation and heat absorption. The refrigerant flowing out of the first outdoor heat exchanger flows into the gas-liquid separator 113 via the second reversing element 105 and the first reversing element 104 in sequence, while the refrigerant flowing out of the second outdoor heat exchanger flows directly into the gas-liquid separator 113 via the second reversing element 105. Finally, they both flow back to the suction port of the compressor 101, completing the parallel heating cycle of the two heat exchangers.

[0035] refer to Figure 4 When the air conditioning system is in heating mode and the probability of frosting is high (i.e., the air conditioning system is in single-unit heating mode), the bypass valve 1111, the second on / off component 108, the second flow regulator 110 connected to the second outdoor heat exchanger, the first flow regulator 109 connected to the second outdoor heat exchanger, and the first on / off component 106 remain closed. The throttle valve 112 and the first flow regulator 109 connected to the first outdoor heat exchanger are opened to the maximum opening degree, and the second flow regulator 110 connected to the first outdoor heat exchanger is opened for conduction. The high-temperature and high-pressure refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 102 via the first reversing component 104, where it condenses and releases heat to provide heat for the room. After heat exchange, the refrigerant flows into the first outdoor heat exchanger via the throttle valve 112 and the second flow regulating component 110 connected to the first outdoor heat exchanger, where it evaporates and absorbs heat. The refrigerant that has completed evaporation flows into the gas-liquid separator 113 via the first flow regulating component 109, the second reversing component 105, and the first reversing component 104 connected to the first outdoor heat exchanger, and finally flows back to the suction port of the compressor 101, completing the heating cycle of a single main outdoor heat exchanger 103 (i.e., the first outdoor heat exchanger). The auxiliary outdoor heat exchanger 103 (i.e., the second outdoor heat exchanger) does not participate in operation in this mode.

[0036] refer to Figure 1When the air conditioning system is in single-unit heating operation mode, if it is determined that the first outdoor heat exchanger needs to be defrosted, the second reversing component 105 performs a reversal, the bypass valve 1111 opens, the first on / off component 106 is connected to the first outdoor heat exchanger side, the second flow regulating component 110 connected to the first outdoor heat exchanger closes, the second flow regulating component 110 connected to the second outdoor heat exchanger opens, each of the first flow regulating components 109 connected to the first outdoor heat exchanger and the second outdoor heat exchanger opens, the throttle valve 112 opens, and the second on / off component 108 closes. The refrigerant flow is divided into two parallel paths: one is the heating circuit, where a portion of the high-temperature refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 102 through the first reversing component 104 to release heat, and then flows into the second outdoor heat exchanger through the throttle valve 112 and the second flow regulating component 110 connected to the second outdoor heat exchanger to evaporate and absorb heat. After that, it flows into the gas-liquid separator 113 through the first flow regulating component 109, the second reversing component 105, and the first reversing component 104 connected to the second outdoor heat exchanger to maintain continuous indoor heating; the other is the defrosting circuit, where another portion of the high-temperature refrigerant discharged from the compressor 101 flows out through the bypass valve 1111 and the first on / off component 106, and the low-temperature refrigerant flows out through the first flow regulating component 109 and the second reversing component 105 connected to the first outdoor heat exchanger. After mixing with the return gas from the heating circuit, the residual liquid refrigerant is vaporized by electric heating and then flows back into the gas-liquid separator 113 to the suction port of the compressor 101, realizing the parallel operation of defrosting and heating.

[0037] refer to Figure 5After the second outdoor heat exchanger has been continuously assisted with heating several times, it may also frost up. At this time, when the air conditioning system is in the single-unit heating operation mode, the second reversing component 105 maintains the corresponding reversing state, the bypass valve 1111 is opened, the first on / off component 106 is connected to the second outdoor heat exchanger, the second flow regulating component 110 connected to the second outdoor heat exchanger is closed, the first flow regulating component 109 connected to the first outdoor heat exchanger, the first flow regulating component 109 connected to the first outdoor heat exchanger, and the first flow regulating component 109 connected to the second outdoor heat exchanger remain open, and the second on / off component 108 is closed. The refrigerant flow is divided into two parallel paths: one is a heating circuit, where a portion of the high-temperature refrigerant discharged from the compressor 101 flows into the indoor heat exchanger 102 via the first reversing element 104 to release heat, and then flows sequentially through the refrigeration throttling valve 112 and the second flow regulating element 110 connected to the first outdoor heat exchanger to evaporate and absorb heat. Afterwards, it flows through the first flow regulating element 109, the second reversing element 105, and the first reversing element 104 connected to the first outdoor heat exchanger before converging into the gas-liquid separator 113 to maintain continuous indoor heating; the other path is a defrosting circuit, where the compressor... Another portion of the high-temperature refrigerant discharged from the compressor 101 flows directly into the second outdoor heat exchanger through the bypass valve 1111 and the first switching element 106. The high-temperature refrigerant melts the frost layer on the surface of the second outdoor heat exchanger. The defrosted low-temperature refrigerant flows out through the first flow regulating element 109 and the second reversing element 105 connected to the second outdoor heat exchanger. After mixing with the return gas of the heating circuit, the residual liquid refrigerant is vaporized by electric heating and then flows back into the gas-liquid separator 113 to the suction port of the compressor 101, realizing alternating defrosting and continuous heating of the two outdoor heat exchangers 103.

[0038] This embodiment provides an air conditioning system that uses two outdoor heat exchangers and a first commutator, a second commutator, and a first on / off switch to control the refrigerant flow path. During heating operation, when one outdoor heat exchanger needs defrosting, the first and second commutators are commutated, and the first on / off switch is controlled. This allows the refrigerant flowing from the compressor's exhaust port to flow back to the compressor's suction port via the indoor heat exchanger and the other outdoor heat exchanger for continuous heating. The other refrigerant flows directly to the outdoor heat exchanger requiring defrosting via a bypass pipe and back to the compressor's suction port for defrosting. This allows the defrosting process to run in parallel with the heating process, avoiding the complete interruption of indoor heating and indoor temperature fluctuations caused by mode switching in existing reverse-cycle defrosting methods. This ensures continuous indoor heating during defrosting, improving user comfort.

[0039] refer to Figure 6 , Figure 6 This is a flowchart illustrating a control method for an air conditioning system provided in an embodiment of this application. The control method for an air conditioning system provided in this embodiment specifically includes the following steps: S601: Obtain the corresponding operating mode of the air conditioning system.

[0040] S602: When the operating mode is used to indicate that the air conditioning system is in heating mode, determine whether there is an outdoor heat exchanger that needs to be defrosted.

[0041] S603: When there is an outdoor heat exchanger that needs to be defrosted, the first reversing element and the second reversing element are reversing controlled and the first on / off element is on / off controlled, so that the refrigerant flowing out of the compressor's exhaust port flows back to the compressor's suction port through the indoor heat exchanger and the outdoor heat exchanger that does not need to be defrosted to maintain heating, and the refrigerant flowing out of the exhaust port flows back to the suction port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

[0042] Regarding steps S601 to S603 above, the operating mode refers to the current operating mode of the air conditioning system, including heating mode, cooling mode, defrosting mode, etc.

[0043] Specifically, after the air conditioning system is started, it first obtains the current operating mode of the air conditioning system. The operating mode can be set by the user or automatically determined by the air conditioning system based on the indoor and outdoor ambient temperatures. When the operating mode indicates that the air conditioning system is in heating mode, it proceeds to the next step of determining whether one of the two outdoor heat exchangers requires defrosting.

[0044] When there is an outdoor heat exchanger that needs to be defrosted, it can be controlled according to the commutation control method of the first commutator and the second commutator and the on / off control method of the first on / off element, so as to realize the air conditioning system heating and defrosting at the same time.

[0045] In one embodiment, during the defrosting process of the outdoor heat exchanger that needs defrosting, the control method for an air conditioning system provided in this embodiment further includes the following steps: Obtain the first refrigerant temperature corresponding to the refrigerant in the connecting pipe between the second commutator and the intake port; When the temperature of the first refrigerant is lower than the first temperature threshold, the heating device is turned on to heat the refrigerant flowing out of the outdoor heat exchanger that needs to be defrosted.

[0046] The first refrigerant temperature refers to the actual temperature of the refrigerant flowing from the outdoor heat exchanger that needs to be defrosted, through the second reversing element, to the compressor's suction port during the defrosting process. This first refrigerant temperature reflects the state of the refrigerant returning to the compressor after defrosting.

[0047] The first temperature threshold can be understood as a preset safe lower limit for refrigerant temperature. When the first refrigerant temperature is lower than the first temperature threshold, it indicates that the temperature of the refrigerant returning to the compressor's suction port is too low, and the heating device needs to be activated for auxiliary heating to ensure that the refrigerant enters the compressor in a safe state.

[0048] Specifically, during the defrosting process of the outdoor heat exchanger that needs to be defrosted, the first refrigerant temperature in the pipeline is obtained in real time by a temperature sensor installed on the connecting pipeline between the second commutator and the air intake.

[0049] The first refrigerant temperature is compared with a first temperature threshold. If the first refrigerant temperature is lower than the first temperature threshold, there is a risk of liquid slugging damaging the compressor if the refrigerant enters directly. In this case, the heating device is activated to heat the refrigerant flowing through the connecting pipe, raising its temperature and ensuring that the liquid components in the refrigerant fully evaporate into a gaseous state. The heated refrigerant then enters the suction port, ensuring that the compressor draws in gaseous refrigerant within a safe temperature range.

[0050] In this embodiment, during the defrosting process, the first refrigerant temperature in the defrosting return pipeline is monitored in real time. When the first refrigerant temperature is lower than the first temperature threshold, the heating device is activated to heat the refrigerant. This ensures that the low-temperature refrigerant flowing out of the outdoor heat exchanger that needs to be defrosted is fully heated to a safe suction temperature before entering the compressor. This prevents the risk of compressor liquid slugging caused by excessively low defrosting return refrigerant temperature or the presence of liquid components, thus ensuring the reliability of compressor operation and the safety of the air conditioning system during the defrosting process.

[0051] In another embodiment, during the defrosting process of the outdoor heat exchanger that needs defrosting, the air conditioning system control method provided in this embodiment further includes the following steps: Get the total number of heating cycles of the outdoor heat exchanger currently participating in heating and the temperature of the first coil corresponding to the coil in the outdoor heat exchanger currently participating in heating. When the total number of heating cycles exceeds the preset threshold or the temperature of the first coil is less than the second temperature threshold, it is determined that the outdoor heat exchanger currently participating in heating needs to be defrosted and the outdoor heat exchanger undergoing defrosting needs to participate in heating. The first and second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out of the exhaust port flows back to the intake port through the indoor heat exchanger and the outdoor heat exchanger that participates in heating to maintain heating, and the refrigerant flowing out of the exhaust port flows back to the intake port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

[0052] The total number of heating cycles can be understood as the cumulative number of heating cycles that the outdoor heat exchanger currently participating in heating has participated in since the start of this operation. The preset threshold number of cycles can be understood as a pre-set critical value for the total number of heating cycles.

[0053] The first coil temperature can be understood as the actual temperature of the coil in the outdoor heat exchanger currently participating in heating. This first coil temperature reflects the current operating status and degree of frosting of the outdoor heat exchanger currently participating in heating. The second temperature threshold can be understood as a pre-set critical value for the coil temperature.

[0054] During the defrosting process of outdoor heat exchangers that require defrosting, the total number of heating cycles of the outdoor heat exchangers currently participating in heating and the temperature of the first coil corresponding to the coil in that outdoor heat exchanger are simultaneously acquired. The total number of heating cycles can be obtained by accumulating them using a counter, and the temperature of the first coil can be acquired in real time by a temperature sensor attached to the surface of the coil.

[0055] The total number of heating cycles and the first coil temperature are compared with a preset cycle threshold and a second temperature threshold, respectively. If the total number of heating cycles exceeds the preset cycle threshold, it indicates that the outdoor heat exchanger currently participating in heating has accumulated multiple cycles, and the risk of surface frosting has significantly increased. Continuing to maintain its heating role may lead to a decrease in heating efficiency. Alternatively, if the first coil temperature is lower than the second temperature threshold, it indicates that the coil temperature of the outdoor heat exchanger currently participating in heating is too low, and its surface may have already frosted, affecting its heat exchange capacity. In this case, the roles of the two outdoor heat exchangers need to be switched; that is, the outdoor heat exchanger currently participating in heating needs to defrost, and the outdoor heat exchanger undergoing defrosting needs to participate in heating. The first and second commutator components are commutated, and the first on / off component is controlled to ensure that the outdoor heat exchanger requiring heating participates in heating and the outdoor heat exchanger requiring defrosting undergoes defrosting. Specific heat exchange control methods and on / off control methods can be found above; this embodiment will not elaborate further.

[0056] Through the above methods, this embodiment simultaneously monitors the total number of heating cycles and coil temperature of the outdoor heat exchanger currently participating in heating during the defrosting process. When the switching conditions are met, it actively triggers the role switching of the two outdoor heat exchangers, realizing the dynamic rotation of heating and defrosting tasks. This avoids the accumulation of frost caused by continuous heating of a single heat exchanger, ensuring the balanced operation of the two outdoor heat exchangers and the continuous and stable heating of the air conditioning system.

[0057] In this embodiment, step S602 specifically includes: When the working mode is used to indicate that the air conditioning system is heating, environmental information of the outdoor environment where the air conditioning system is located is obtained. Based on environmental information, determine the target frosting probability for the air conditioning system; When the target frost probability is greater than or equal to the preset probability threshold, the outdoor heat exchanger that needs to participate in heating is determined from the two outdoor heat exchangers. The first and second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out of the exhaust port flows back to the intake port through the indoor heat exchanger and the outdoor heat exchanger that needs to participate in heating in the air conditioning system to achieve heating. During the heating process, determine whether the outdoor heat exchanger participating in heating needs defrosting.

[0058] Environmental information can be understood as relevant parameters of the outdoor environment in which the air conditioning system is located, such as outdoor temperature, outdoor humidity, and weather conditions. Environmental information is used to determine whether the current outdoor environment is likely to cause frost formation on the outdoor heat exchanger; the lower the outdoor temperature and the higher the outdoor humidity, the greater the likelihood of frost formation.

[0059] The target frosting probability refers to an assessment value determined based on environmental information to characterize the likelihood of frosting occurring on an outdoor heat exchanger under the current outdoor environment. A higher target frosting probability indicates that the outdoor heat exchanger is more prone to frosting under the current outdoor conditions.

[0060] The preset probability threshold can be understood as a pre-set critical value for the probability of frost formation. When the target frost probability is greater than or equal to the preset probability threshold, it indicates that the current outdoor environmental conditions have a high risk of frost formation, and corresponding countermeasures need to be taken.

[0061] Specifically, when the operating mode is used to indicate that the air conditioning system is in heating mode, the environmental information of the outdoor environment where the air conditioning system is located is first obtained. Based on this environmental information, the target frosting probability under the current operating conditions is determined.

[0062] The determined target frosting probability is compared with a preset probability threshold. When the target frosting probability is greater than or equal to the preset probability threshold (meaning the air conditioning system is in single-unit heating mode), it indicates a high-risk outdoor environment. In this case, the outdoor heat exchanger that needs to participate in heating is determined from the two outdoor heat exchangers. For example, based on the example described above, the first outdoor heat exchanger is selected as the one that needs to participate in heating, while the second outdoor heat exchanger is temporarily not involved in heating. This allows for immediate switching to the other outdoor heat exchanger to continue heating if the outdoor heat exchanger participating in heating frosts due to continuous operation, avoiding heating interruption caused by simultaneous frosting of both outdoor heat exchangers.

[0063] The first and second commutator components are commutated, and the first on / off component is controlled to allow the refrigerant discharged from the compressor to flow back to the suction port via the indoor heat exchanger and the outdoor heat exchanger that needs to participate in heating (such as the first outdoor heat exchanger). At this time, the other outdoor heat exchanger (such as the second outdoor heat exchanger) does not participate in heating, and the refrigerant does not flow through that outdoor heat exchanger.

[0064] During the continuous operation of the outdoor heat exchanger involved in heating, its operating status is monitored in real time. When the relevant parameters of the outdoor heat exchanger meet the defrosting initiation conditions (e.g., the coil temperature of the outdoor heat exchanger continues to decrease, or the heat exchange temperature difference between the coil temperature of the outdoor heat exchanger and the outdoor ambient temperature reaches a preset temperature difference threshold), the outdoor heat exchanger involved in heating is determined to be the one requiring defrosting. Subsequently, step S603 can be executed to perform a defrosting operation on the outdoor heat exchanger, while simultaneously switching to another outdoor heat exchanger to maintain heating.

[0065] Through the above methods, this embodiment first determines the target frosting probability based on outdoor environmental information when the air conditioner is in heating mode. When the target frosting probability is high, only one outdoor heat exchanger is selected to participate in heating. After it starts frosting, the system switches to defrosting mode. Therefore, in high-frosting-risk environments, the simultaneous frosting of two outdoor heat exchangers avoids heating interruptions, ensuring the continuity of indoor heating and the operational reliability of the air conditioning system in such environments.

[0066] It should be noted that the outdoor heat exchanger to be used for heating can be determined from two outdoor heat exchangers as follows: Obtain the temperature change rate of the coils and the power change rate of the outdoor fan in each outdoor heat exchanger. For each outdoor heat exchanger, the temperature drop rate and power increase rate are combined to calculate a frosting rate score. The higher the frosting rate score, the more prone the outdoor heat exchanger is to frosting. Therefore, the outdoor heat exchanger with the lowest frosting rate score is selected as the one to be used for heating. This method can balance the frosting rate and extend the service life of the air conditioning system.

[0067] After determining the target frosting probability, the air conditioning system control method provided in this embodiment further includes the following steps: When the target frost probability is less than the preset probability threshold, both outdoor heat exchangers are required to participate in heating. The first and second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out of the exhaust port is diverted to the two outdoor heat exchangers through the indoor heat exchanger, and the refrigerant flows back from the two outdoor heat exchangers to the intake port to achieve heating. When both outdoor heat exchangers are engaged in heating, return to the step of obtaining environmental information about the outdoor environment where the air conditioning system is located.

[0068] Among them, after comparing the target frost probability with the preset probability threshold, if the target frost probability is less than the preset probability threshold, it means that the current outdoor temperature and humidity conditions do not meet the criteria for judging high frost risk and belong to low frost risk conditions.

[0069] Under low-frosting-risk conditions, the possibility of both outdoor heat exchangers frosting simultaneously is relatively small. Determining that both outdoor heat exchangers must participate in heating can fully utilize the heat exchange area and improve the heating efficiency of the air conditioning system.

[0070] At this time, the first and second commutator components are commutated, and the first on / off component is switched on / off, so that both outdoor heat exchangers can participate in heating simultaneously. The commutation control method and the on / off control method can be referred to the above description, and will not be repeated here in this embodiment.

[0071] When both outdoor heat exchangers are engaged in heating, the system returns to the step of acquiring environmental information about the outdoor environment where the air conditioning system is located to re-determine the target frosting probability. Through cyclical monitoring, when changes in environmental conditions increase the risk of frosting, the system can promptly switch to single heat exchanger heating to ensure continuous heating.

[0072] In this embodiment, when the target frost probability is low, two outdoor heat exchangers are controlled to participate in heating simultaneously, making full use of the heat exchange area to improve heating efficiency. At the same time, environmental information is continuously monitored to ensure that when the frost risk increases, it can be switched to single heat exchanger heating in a timely manner, thus taking into account both efficient heating when the frost risk is low and reliable anti-frost protection when the frost risk is high.

[0073] The environmental information mentioned above specifically includes outdoor ambient temperature and outdoor ambient humidity. Based on this environmental information, the target frosting probability for the air conditioning system is determined, including: Based on the outdoor heat exchange temperature and outdoor ambient humidity, an initial frosting probability matching the outdoor heat exchange temperature and outdoor ambient humidity is determined from the first correlation. Obtain defrosting energy consumption information corresponding to the last defrosting of the air conditioning system; Based on defrosting energy consumption information, determine the correction coefficient corresponding to the initial frosting probability; The initial frosting probability is corrected using a correction factor to obtain the target frosting probability for the air conditioning system.

[0074] The first association stores multiple sets of correspondences between outdoor heat exchange temperature, outdoor ambient humidity, and initial frost probability.

[0075] Defrosting energy consumption information can be understood as the energy consumed by the air conditioning system during the last defrosting operation, such as the duration of defrosting, the compressor's operating power during defrosting, or the total power consumption. Defrosting energy consumption information indirectly reflects the severity of frost buildup on the outdoor heat exchanger that needed defrosting before the last defrosting.

[0076] Specifically, after obtaining the current outdoor ambient temperature and humidity, the system uses the outdoor ambient temperature and humidity as indexes to query the pre-stored first association relationship to find records that match the current outdoor ambient temperature and humidity, and uses the frost probability corresponding to the record as the initial frost probability.

[0077] Retrieve the historical operation records of the air conditioning system to obtain the defrosting energy consumption information corresponding to the last defrosting operation. The defrosting energy consumption information may include the duration of the last defrosting operation.

[0078] Based on the defrosting duration, a correction coefficient matching the defrosting duration is determined from the pre-set mapping relationship between defrosting duration and correction coefficients. This correction coefficient is then set as the correction coefficient corresponding to the initial frosting probability. A longer defrosting duration results in a larger correction coefficient, and a shorter defrosting duration results in a smaller correction coefficient.

[0079] The initial frosting probability is corrected by the determined correction coefficient to obtain the target frosting probability. For example, the initial frosting probability can be multiplied by the correction coefficient, and the product is the target frosting probability.

[0080] It should be noted that the aforementioned correction coefficient can also be determined based on the total drainage volume corresponding to the previous defrost cycle of the air conditioning system. In other words, by pre-setting the mapping relationship between the total drainage volume and the correction coefficient, the correction coefficient can be obtained through this mapping relationship when the total drainage volume corresponding to the previous defrost cycle is obtained. A large total drainage volume indicates that defrosting was triggered only after significant frost buildup, resulting in a late trigger. In this case, the initial frost probability can be automatically lowered to obtain the target frost probability, providing a more accurate decision-making basis for subsequent defrost control.

[0081] In this embodiment, based on the determination of the initial frost probability according to the outdoor ambient temperature and humidity, the defrosting energy consumption information of the previous defrosting is used to further correct the initial frost probability, so that the obtained target frost probability is closer to the actual operating conditions, providing a more accurate decision basis for subsequent defrosting control.

[0082] S604: When the working mode is used to indicate the cooling of the air conditioning system, the first commutator and the second commutator are commutated and the first on / off element and the second on / off element are switched on and off, so that the refrigerant flowing out of the exhaust port returns to the intake port through the two outdoor heat exchangers and the indoor heat exchanger connected in series, so as to achieve cooling.

[0083] In this embodiment, when the operating mode is used to indicate that the air conditioning system is cooling, the first and second commutator are commutated and the first and second on / off components are switched on and off, so that the two outdoor heat exchangers are connected in series to jointly complete the heating. The specific commutation control method and on / off method in the cooling mode can be referred to the above description, and will not be repeated here.

[0084] In this embodiment, by setting a second on / off element between the two outdoor heat exchangers and controlling the second on / off element to conduct in cooling mode, the two outdoor heat exchangers form a series condensation and heat dissipation path. This allows the high-temperature refrigerant flowing out of the compressor exhaust port to pass through the two outdoor heat exchangers in sequence for staged condensation and heat dissipation, increasing the condensation heat exchange area and extending the heat dissipation path of the refrigerant on the outdoor side. This results in more complete refrigerant condensation, leading to a lower temperature of the liquid refrigerant entering the outdoor heat exchanger, thus improving the energy efficiency and cooling effect in cooling mode.

[0085] After performing step S601, the air conditioning system control method provided in this embodiment further includes the following steps: Based on the operating mode, determine the target opening degree of each first flow regulator and each second flow regulator corresponding to the operating mode. While controlling the first commutator, the second commutator, and the first switching element, the opening degree of each first flow regulator and each second flow regulator is controlled based on each target opening degree.

[0086] After obtaining the operating mode, the target opening degree of each first flow regulator and each second flow regulator can be determined based on the pre-set mapping relationship between the operating mode and each opening degree. The specific mapping relationship can be referred to the control methods of each first flow regulator and each second flow regulator in different modes described above, which will not be repeated here in this embodiment.

[0087] After obtaining the target opening degrees of each first flow regulator and each second flow regulator, while controlling the first commutator, the second commutator, and the first on / off element, the opening degrees of each first flow regulator and each second flow regulator are synchronously controlled based on the determined target opening degrees, so that the opening degrees of each first flow regulator and each second flow regulator reach their respective target opening degrees. By coordinating the execution of commutation control, on / off control, and flow regulation control, a refrigerant flow distribution state matching the current operating mode can be established while switching refrigerant circulation paths, achieving precise distribution of refrigerant in each branch.

[0088] This embodiment provides a control method for an air conditioning system. By setting two outdoor heat exchangers in the air conditioning system and setting a first commutator, a second commutator, and a first on / off component to achieve switching control of the refrigerant flow path, when one of the outdoor heat exchangers needs to be defrosted during the heating operation of the air conditioning system, the first and second commutators are switched and the first on / off component is controlled to switch them on and off. This allows the refrigerant flowing out of the compressor's exhaust port to flow back to the compressor's suction port through the indoor heat exchanger and the other outdoor heat exchanger to achieve continuous heating, and another path to flow directly into the outdoor heat exchanger that needs to be defrosted through a bypass pipe to return to the compressor's suction port to achieve defrosting. This allows the defrosting process to be executed in parallel with the heating process, avoiding the problems of complete interruption of indoor heating and indoor temperature fluctuations caused by mode switching in the existing reverse circulation defrosting method. As a result, the indoor heating is continuously supplied during the defrosting period, improving user comfort.

[0089] refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of a control device for an air conditioning system provided in an embodiment of this application. The control device for an air conditioning system provided in this embodiment includes: an acquisition module 10, a determination module 20, and a control module 30. The acquisition module 10 is used to acquire the corresponding operating mode of the air conditioning system; the determination module 20 is used to determine whether there is an outdoor heat exchanger requiring defrosting when the operating mode indicates that the air conditioning system is in heating mode; the control module 30 is used to control the reversing of a first commutator and a second commutator and to control the on / off state of a first switching element when there is an outdoor heat exchanger requiring defrosting, so that the refrigerant flowing from the compressor's exhaust port flows back to the compressor's suction port through the indoor heat exchanger and the outdoor heat exchanger that does not require defrosting to maintain heating, and that the refrigerant flowing from the exhaust port flows back to the suction port through a bypass pipe and the outdoor heat exchanger that requires defrosting to achieve defrosting.

[0090] In this embodiment, the control module 30 is further configured to: During the defrosting process of the outdoor heat exchanger that needs to be defrosted, the first refrigerant temperature corresponding to the refrigerant in the connecting pipe between the second commutator and the air intake is obtained. When the temperature of the first refrigerant is lower than the first temperature threshold, the heating device is turned on to heat the refrigerant flowing out of the outdoor heat exchanger that needs to be defrosted.

[0091] In this embodiment, the determining module 20 is further configured to: When the operating mode is used to indicate that the air conditioning system is in heating mode, environmental information of the outdoor environment where the air conditioning system is located is obtained. Based on the environmental information, determine the target frosting probability corresponding to the air conditioning system; When the target frost probability is greater than or equal to a preset probability threshold, the outdoor heat exchanger that needs to participate in heating is determined from the two outdoor heat exchangers. The first commutator and the second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out from the exhaust port flows back to the intake port through the indoor heat exchanger in the air conditioning system and the outdoor heat exchanger that needs to participate in heating to achieve heating. During the heating process, it is determined whether the outdoor heat exchanger participating in heating needs to be defrosted.

[0092] In this embodiment, the environmental information includes outdoor ambient temperature and outdoor ambient humidity; the determining module 20 is further configured to: Based on the outdoor heat exchange temperature and the outdoor ambient humidity, an initial frosting probability that matches the outdoor heat exchange temperature and the outdoor ambient humidity is determined from the first association relationship. The first association relationship stores multiple sets of correspondences between the outdoor heat exchange temperature, the outdoor ambient humidity and the initial frosting probability. Obtain the defrosting energy consumption information corresponding to the last defrosting of the air conditioning system; Based on the defrosting energy consumption information, determine the correction coefficient corresponding to the initial frosting probability; The initial frosting probability is corrected using the correction coefficient to obtain the target frosting probability corresponding to the air conditioning system.

[0093] In this embodiment, the control module 30 is further configured to: After determining the target frost probability, when the target frost probability is less than the preset probability threshold, it is determined that both outdoor heat exchangers must participate in heating. The first and second reversing components are reversing and the first on / off component is on / off controlled, so that the refrigerant flowing out of the exhaust port is diverted to the two outdoor heat exchangers through the indoor heat exchanger, and the refrigerant flows back from the two outdoor heat exchangers to the intake port to achieve heating. When both outdoor heat exchangers are engaged in heating, the process returns to the step of obtaining environmental information about the outdoor environment where the air conditioning system is located.

[0094] In this embodiment, the control module 30 is further configured to: During the defrosting process of the outdoor heat exchanger that needs to be defrosted, the total number of heating cycles of the outdoor heat exchanger currently participating in heating and the temperature of the first coil corresponding to the coil in the outdoor heat exchanger currently participating in heating are obtained. When the total number of heating cycles exceeds a preset threshold or the temperature of the first coil is less than a second temperature threshold, it is determined that the outdoor heat exchanger currently participating in heating needs to be defrosted and the outdoor heat exchanger undergoing defrosting needs to participate in heating. The first and second reversing components are reversing controlled, and the first on / off component is on / off controlled, so that the refrigerant flowing out of the exhaust port flows back to the intake port through the indoor heat exchanger and the outdoor heat exchanger that needs to participate in heating to maintain heating, and so that the refrigerant flowing out of the exhaust port flows back to the intake port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

[0095] In this embodiment, the control module 30 is further configured to: After obtaining the operating mode, when the operating mode is used to indicate that the air conditioning system is cooling, the first commutator and the second commutator are commutated and the first on / off element and the second on / off element are switched on and off, so that the refrigerant flowing out from the exhaust port flows back to the intake port through the two outdoor heat exchangers and the indoor heat exchanger connected in series, so as to achieve cooling.

[0096] In this embodiment, the control module 30 is further configured to: After obtaining the operating mode, the target opening degree of each first flow regulator and each second flow regulator corresponding to the operating mode is determined based on the operating mode. While controlling the first commutator, the second commutator, and the first switching element, the opening degree of each of the first flow regulators and each of the second flow regulators is controlled based on each of the target opening degrees.

[0097] This embodiment provides a control device for an air conditioning system. By setting two outdoor heat exchangers in the air conditioning system and setting a first commutator, a second commutator, and a first on / off element to achieve switching control of the refrigerant flow path, when one of the outdoor heat exchangers needs to be defrosted during the heating operation of the air conditioning system, the first and second commutators are switched and the first on / off element is controlled to switch them on and off. This allows the refrigerant flowing from the compressor's exhaust port to flow back to the compressor's suction port through the indoor heat exchanger and the other outdoor heat exchanger to achieve continuous heating, and another path to flow directly into the outdoor heat exchanger that needs to be defrosted through a bypass pipe to flow back to the compressor's suction port to achieve defrosting. This allows the defrosting process to be executed in parallel with the heating process, avoiding the problems of complete interruption of indoor heating and indoor temperature fluctuations caused by mode switching in the existing reverse circulation defrosting method. As a result, the indoor heating is continuously supplied during the defrosting period, improving user comfort.

[0098] Figure 8 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this application. Figure 8The diagram shows an energy-saving air conditioning system 800, which includes at least one processor 801, a memory 802, at least one network interface 804, and other user interfaces 803. The various components in the air conditioner 800 are coupled together via a bus system 805. It is understood that the bus system 805 is used to achieve communication between these components. In addition to a data bus, the bus system 805 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 8 The general labeled all buses as Bus System 805.

[0099] The user interface 503 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0100] It is understood that the memory 802 in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 802 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0101] In some implementations, memory 802 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 8021 and application programs 8022.

[0102] The operating system 8021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 8022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 8022.

[0103] In this embodiment of the invention, the processor 801 executes the method steps provided in each method embodiment by calling the program or instructions stored in the memory 802, specifically the program or instructions stored in the application program 8022.

[0104] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by processor 801. Processor 801 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 801 or by instructions in the form of software. The processor 801 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 802. Processor 801 reads the information in memory 802 and, in conjunction with its hardware, completes the steps of the above method.

[0105] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0106] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0107] The air conditioning system provided in this embodiment can be as follows: Figure 8 The air conditioning system shown can perform the following functions: Figure 6 All steps of the control method for the central air conditioning system, thereby achieving Figure 6 For details on the technical effects of the control method for the air conditioning system shown, please refer to [link / reference]. Figure 6 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0108] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0109] When one or more programs in the storage medium can be executed by one or more processors to implement the air conditioning system control method described above, which is executed on the control device side of the air conditioning system.

[0110] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0111] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0112] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air conditioning system, characterized in that, include: Compressor, indoor heat exchanger, two outdoor heat exchangers, first commutator, second commutator and first switching element; The first commutator is connected to the air intake of the compressor, the air exhaust of the compressor, the indoor heat exchanger, and the second commutator, respectively. The second commutator is connected to both outdoor heat exchangers and the air intake, respectively; The first on / off element is connected to the two outdoor heat exchangers respectively, and the first on / off element is connected to the exhaust port through a bypass pipe; The indoor heat exchanger is connected to each of the two outdoor heat exchangers; When the air conditioning system is heating, if it is determined that one of the two outdoor heat exchangers needs to be defrosted, the refrigerant flowing out of the exhaust port is returned to the intake port through the indoor heat exchanger and the other outdoor heat exchanger to maintain heating, and the refrigerant flowing out of the exhaust port is returned to the intake port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

2. The air conditioning system according to claim 1, characterized in that, A heating device is provided on the connecting pipe between the second reversing component and the air intake; The heating device is used to heat the refrigerant flowing out of the outdoor heat exchanger that needs to be defrosted during defrosting.

3. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a second switch, which is connected between the two outdoor heat exchangers; When the air conditioning system is cooling, by controlling the reversing of the first commutator and the second commutator and controlling the on / off of the first on / off element and the second on / off element, the refrigerant flowing out of the exhaust port is returned to the intake port through the two outdoor heat exchangers and the indoor heat exchanger connected in series.

4. The air conditioning system according to any one of claims 1 to 3, characterized in that, A first flow regulator is provided on the connecting pipe between the second reversing component and each of the outdoor heat exchangers, and a second flow regulator is provided on the connecting pipe between the indoor heat exchanger and each of the outdoor heat exchangers; The inflow and outflow rates of each of the outdoor heat exchangers are adjusted by controlling the first flow regulator and the second flow regulator.

5. A control method for an air conditioning system, characterized in that, Applied to the air conditioning system as described in any one of claims 1 to 4, the method comprises: Obtain the operating mode corresponding to the air conditioning system; When the operating mode is used to indicate that the air conditioning system is in heating mode, it is determined whether one of the two outdoor heat exchangers requires defrosting. When the outdoor heat exchanger that requires defrosting is present, the first and second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out of the compressor's exhaust port flows back to the compressor's suction port through the indoor heat exchanger and the outdoor heat exchanger that does not require defrosting to maintain heating, and the refrigerant flowing out of the exhaust port flows back to the suction port through the bypass pipe and the outdoor heat exchanger that requires defrosting to achieve defrosting.

6. The method according to claim 5, characterized in that, The method further includes, during the defrosting process of the outdoor heat exchanger requiring defrosting: Obtain the first refrigerant temperature in the connecting pipe between the second commutator and the intake port; When the temperature of the first refrigerant is lower than the first temperature threshold, the heating device is turned on to heat the refrigerant flowing out of the outdoor heat exchanger that needs to be defrosted.

7. The method according to claim 5, characterized in that, When the operating mode is used to indicate that the air conditioning system is in heating mode, determining whether one of the two outdoor heat exchangers requires defrosting includes: When the operating mode is used to indicate that the air conditioning system is in heating mode, environmental information of the outdoor environment where the air conditioning system is located is obtained. Based on the environmental information, determine the target frosting probability corresponding to the air conditioning system; When the target frost probability is greater than or equal to a preset probability threshold, the outdoor heat exchanger that needs to participate in heating is determined from the two outdoor heat exchangers. The first commutator and the second commutator are commutated and the first on / off element is switched on and off, so that the refrigerant flowing out from the exhaust port flows back to the intake port through the indoor heat exchanger in the air conditioning system and the outdoor heat exchanger that needs to participate in heating to achieve heating. During the heating process, it is determined whether the outdoor heat exchanger participating in heating needs to be defrosted.

8. The method according to claim 7, characterized in that, The environmental information includes outdoor ambient temperature and outdoor ambient humidity; Determining the target frosting probability of the air conditioning system based on the environmental information includes: Based on the outdoor heat exchange temperature and the outdoor ambient humidity, an initial frosting probability that matches the outdoor heat exchange temperature and the outdoor ambient humidity is determined from the first association relationship. The first association relationship stores multiple sets of correspondences between the outdoor heat exchange temperature, the outdoor ambient humidity and the initial frosting probability. Obtain the defrosting energy consumption information corresponding to the last defrosting of the air conditioning system; Based on the defrosting energy consumption information, determine the correction coefficient corresponding to the initial frosting probability; The initial frosting probability is corrected using the correction coefficient to obtain the target frosting probability corresponding to the air conditioning system.

9. The method according to claim 7, characterized in that, After determining the target frosting probability, the method further includes: When the target frosting probability is less than the preset probability threshold, it is determined that both outdoor heat exchangers must participate in heating. The first and second reversing components are reversing and the first on / off component is on / off controlled, so that the refrigerant flowing out of the exhaust port is diverted to the two outdoor heat exchangers through the indoor heat exchanger, and the refrigerant flows back from the two outdoor heat exchangers to the intake port to achieve heating. When both outdoor heat exchangers are engaged in heating, the process returns to the step of obtaining environmental information about the outdoor environment where the air conditioning system is located.

10. The method according to claim 5, characterized in that, The method further includes, during the defrosting process of the outdoor heat exchanger requiring defrosting: Obtain the total number of heating cycles of the outdoor heat exchanger currently participating in heating and the temperature of the first coil corresponding to the coil in the outdoor heat exchanger currently participating in heating; When the total number of heating cycles exceeds a preset threshold or the temperature of the first coil is less than a second temperature threshold, it is determined that the outdoor heat exchanger currently participating in heating needs to be defrosted and the outdoor heat exchanger undergoing defrosting needs to participate in heating. The first and second reversing components are reversing controlled, and the first on / off component is on / off controlled, so that the refrigerant flowing out of the exhaust port flows back to the intake port through the indoor heat exchanger and the outdoor heat exchanger that needs to participate in heating to maintain heating, and so that the refrigerant flowing out of the exhaust port flows back to the intake port through the bypass pipe and the outdoor heat exchanger that needs to be defrosted to achieve defrosting.

11. The method according to claim 5, characterized in that, After obtaining the operating mode, the method further includes: When the operating mode is used to indicate that the air conditioning system is cooling, the first commutator and the second commutator are commutated and the first on / off element and the second on / off element are switched on and off, so that the refrigerant flowing out of the exhaust port flows back to the intake port through the two outdoor heat exchangers and the indoor heat exchanger connected in series, so as to achieve cooling.

12. The method according to claim 5, characterized in that, After obtaining the operating mode, the method further includes: Based on the operating mode, determine the target opening degree of each first flow regulator and each second flow regulator corresponding to the operating mode; While controlling the first commutator, the second commutator, and the first switching element, the opening degree of each of the first flow regulators and each of the second flow regulators is controlled based on each of the target opening degrees.

13. A control device for an air conditioning system, characterized in that, include: The acquisition module is used to acquire the corresponding operating mode of the air conditioning system. The determination module is used to determine whether there is an outdoor heat exchanger that needs to be defrosted when the operating mode is used to indicate that the air conditioning system is in heating mode. The control module is used to control the reversing of the first and second reversing components and the on / off of the first switching component when there is an outdoor heat exchanger that needs defrosting. This allows the refrigerant flowing from the compressor's exhaust port to flow back to the compressor's suction port via the indoor heat exchanger and the outdoor heat exchanger that does not need defrosting to maintain heating. It also allows the refrigerant flowing from the exhaust port to flow back to the suction port via a bypass pipe and the outdoor heat exchanger that needs defrosting to achieve defrosting.

14. An air conditioning system, characterized in that, include: Processor and memory; The processor is used to execute the control program of the air conditioning system stored in the memory to implement the control method of the air conditioning system according to any one of claims 5 to 12.

15. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the control method of the air conditioning system according to any one of claims 5 to 12.

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