Control method of air conditioner, controller, air conditioner and medium

Abstract

The embodiment of the invention provides an air conditioner control method, a controller, an air conditioner and a medium, and the method comprises the steps that in response to a heating starting instruction, the outdoor environment temperature is obtained; when the outdoor environment temperature is smaller than the first preset temperature, the air conditioner is controlled to enter half-volume control logic; and in the process of executing the half-volume control logic, the control valve and the first electronic expansion valve are closed so that the refrigerant discharged by the outdoor unit can stop flowing through the first indoor unit heat exchanger, and the second electronic expansion valve is opened so that the refrigerant discharged by the outdoor unit can flow through the second indoor unit heat exchanger. During low-temperature starting, by closing the control valve and the first electronic expansion valve, the length of a pipeline through which a refrigerant passes is reduced, so that the length of a refrigerant oil attached copper pipe is reduced, and refrigerant oil loss caused by the length of the pipeline is reduced; and the inner side heat exchange area during starting can be reduced, the temperature loss of the hot refrigerant is reduced, the high-temperature refrigerant is made to rapidly circulate back to the outdoor unit, and therefore the exhaust temperature of the compressor is rapidly increased, and the oil separation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a control method, a controller, an air conditioner and a medium of an air conditioner. Background Art

[0002] In the related art, most of the existing multi-split units start at low temperatures by controlling the compressor starting platform and optimizing the exhaust superheat, return air superheat and other unit parameters, all of which are aimed at improving the oil separation efficiency and increasing the oil return speed; however, the existing control methods cannot control the size of the system capacity, and cannot fundamentally solve the problem that the system circulating refrigeration oil of the compressor is precipitated and adsorbed on the inner wall of the copper tube and is difficult to circulate under low temperature conditions, resulting in the risk of damage to the compressor due to too low starting oil level or lack of oil. In addition, the heat exchange area of ​​the internal machine during the startup stage is harmful to the rapid improvement of indicators such as exhaust superheat. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, a controller, an air conditioner and a medium for an air conditioner, aiming to solve the problem of too low oil level in the compressor of the air conditioner during low temperature startup, quickly increase the exhaust temperature of the compressor and improve the oil separation efficiency.

[0004] In a first aspect, an embodiment of the present application provides a control method for an air conditioner, the air conditioner comprising an outdoor unit, a first indoor unit heat exchanger, a second indoor unit heat exchanger, a control valve, a first electronic expansion valve, and a second electronic expansion valve; a first refrigerant circulation loop is formed between the outdoor unit, the control valve, the first indoor unit heat exchanger, and the first electronic expansion valve, and a second refrigerant circulation loop is formed between the outdoor unit, the second indoor unit heat exchanger, and the second electronic expansion valve; the method comprises:

[0005] In response to a heating start instruction, obtaining an outdoor ambient temperature;

[0006] When the outdoor environment temperature is lower than a first preset temperature, controlling the air conditioner to enter a half-volume control logic;

[0007] During the execution of the half-volume control logic, the control valve and the first electronic expansion valve are closed to stop the refrigerant discharged from the outdoor unit from flowing through the first indoor heat exchanger, and the second electronic expansion valve is opened to allow the refrigerant discharged from the outdoor unit to flow through the second indoor heat exchanger.

[0008] According to some embodiments of the present application, when the outdoor ambient temperature is less than a first preset temperature, controlling the air conditioner to enter a half-volume control logic includes:

[0009] Determine that the air conditioner is in a heating mode and ends a defrosting mode, and obtain an outdoor ambient temperature and a condensing temperature, an evaporating temperature, and an exhaust temperature of the air conditioner;

[0010] When the outdoor ambient temperature is lower than a first preset temperature, the difference between the condensing temperature and the evaporating temperature is lower than a second preset temperature, and the exhaust temperature is lower than a third preset temperature, the air conditioner is controlled to enter a semi-volume control logic.

[0011] According to some embodiments of the present application, the step of determining that the air conditioner has completed the defrosting mode after executing the heating mode includes:

[0012] After the air conditioner executes the heating mode and the defrosting mode in sequence, obtaining the condenser outlet temperature and the condenser middle temperature of the outdoor unit;

[0013] When the condenser outlet temperature is lower than a fourth preset temperature and the condenser middle temperature is lower than a fifth preset temperature, it is determined that defrosting of the air conditioner is completed.

[0014] According to some embodiments of the present application, when the outdoor ambient temperature is less than a first preset temperature, controlling the air conditioner to enter a half-volume control logic includes:

[0015] Get the outdoor ambient temperature and the time interval between the current time and the last power-on time;

[0016] When the outdoor environment temperature is lower than a first preset temperature and the time interval is greater than a first preset duration, the air conditioner is controlled to enter a semi-volume control logic.

[0017] According to some embodiments of the present application, after opening the second electronic expansion valve, the method further includes:

[0018] detecting the exhaust temperature and condensing temperature of the air conditioner;

[0019] When the exhaust temperature is greater than a sixth preset temperature and the condensing temperature is greater than a seventh preset temperature, the air conditioner is controlled to exit the semi-volume control logic.

[0020] According to some embodiments of the present application, the opening of the second electronic expansion valve includes:

[0021] When the second electronic expansion valve remains closed, the compressor is controlled to operate according to a preset platform frequency, and a bypass line of the compressor is opened so that the compressor performs an internal self-circulating oil return operation;

[0022] The exhaust temperature and the condensing temperature of the air conditioner are detected, and when the difference between the exhaust temperature and the condensing temperature is greater than an eighth preset temperature, the second electronic expansion valve is opened.

[0023] According to some embodiments of the present application, after opening the second electronic expansion valve, the method further includes:

[0024] In the process of executing the semi-volume control logic, controlling the compressor to operate at an operating frequency greater than a preset frequency and continuously operating for a second preset time period;

[0025] The air intake temperature and the evaporation temperature of the air conditioner are detected. When the difference between the air intake temperature and the evaporation temperature is greater than a ninth preset temperature and the difference between the exhaust temperature and the condensation temperature is greater than a tenth preset temperature, the air conditioner is controlled to exit the semi-volume control logic.

[0026] According to some embodiments of the present application, controlling the air conditioner to exit the half-volume control logic includes:

[0027] The control valve and the first electronic expansion valve are opened to allow the refrigerant exhausted from the outdoor unit to begin to flow through the first indoor unit heat exchanger.

[0028] In a second aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the air conditioner control method of the first aspect when running the computer program.

[0029] In a third aspect, an embodiment of the present application provides an air conditioner, comprising the controller of the second aspect described above.

[0030] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the air conditioner control method as described in the first aspect above.

[0031] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program or computer instructions, characterized in that the computer program or the computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the air conditioner control method as described in the first aspect above.

[0032] According to the technical solution of the embodiment of the present application, at least the following beneficial effects are achieved: the embodiment of the present application can reduce the length of the copper tube to which the refrigeration oil is attached by closing the control valve and the first electronic expansion valve at low temperature startup, and by reducing the length of the pipeline through which the refrigerant passes at low temperature startup, thereby reducing the loss of refrigeration oil caused by the length of the pipeline; in addition, it can also reduce the inner heat exchange area at the time of startup, reduce the temperature loss of the hot refrigerant, and allow the high-temperature refrigerant to circulate back to the outdoor unit quickly, thereby quickly increasing the compressor exhaust temperature and improving the oil separation efficiency. Therefore, the embodiment of the present application can solve the problem of slow exhaust superheat establishment speed caused by insufficient compressor oil return and heat loss at the initial startup caused by the invariable heat exchange area of ​​the internal unit. Compared with the traditional solution, it can quickly increase the exhaust superheat and exhaust temperature, increase the oil separation efficiency, reduce the heat loss at startup, reduce the amount of lubricating oil adsorbed by the inner wall of the pipeline, and improve reliability.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0035] Figure 1 is a structural schematic diagram of an air conditioner provided by an embodiment of the present application;

[0036] Figure 2 is a flow chart of a method for controlling an air conditioner provided by an embodiment of the present application;

[0037] Figure 3 is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0038] Figure 4 is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0039] Figure 5 is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0040] Figure 6 is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0041] Figure 7 is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0042] Figure 8is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0043] Fig. 9 is an overall flow chart of a method for controlling an air conditioner provided by an embodiment of the present application;

[0044] Fig.10 is an overall flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0045] Fig.11 is an overall flow chart of a method for controlling an air conditioner provided by another embodiment of the present application;

[0046] Fig.12 It is a schematic diagram of a controller for executing a method for controlling an air conditioner provided in one embodiment of the present application. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0048] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0050] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0051] In some cases, most of the existing multi-split units are started at low temperatures by controlling the compressor starting platform to optimize the exhaust gas superheat, return gas superheat and other unit parameters. The specific methods are to improve the oil separation efficiency and increase the oil return speed. The control method of increasing the variable system load or the variable system effective operating volume on this basis is not considered.

[0052] The existing control methods cannot control the size of the system capacity, and cannot fundamentally solve the problem that the system circulating refrigeration oil of the compressor is precipitated and adsorbed on the inner wall of the copper tube under low temperature conditions and is difficult to circulate, resulting in the risk of damage to the compressor due to the low starting oil level or lack of oil. In addition, the heat exchange area of ​​the internal machine during the startup phase is harmful to the rapid improvement of exhaust superheat and other indicators, and the existing control schemes have not been optimized.

[0053] Based on the above situation, the embodiment of the present application proposes a control method, controller, air conditioner and medium for an air conditioner, aiming to solve the problem of low oil level in the compressor during low-temperature startup of the air conditioner, quickly increase the compressor exhaust temperature and improve the oil separation efficiency.

[0054] The various embodiments of the air conditioner of the present application are further described below in conjunction with the accompanying drawings.

[0055] like Figure 1 As shown, Figure 1 It is a structural schematic diagram of an air conditioner provided in one embodiment of the present application.

[0056] In one embodiment, the air conditioner includes an outdoor unit 100 and at least one indoor unit, wherein the outdoor unit 100 includes a compressor and an outdoor heat exchanger, and the indoor unit includes a first indoor heat exchanger 210 and a second indoor heat exchanger 220; in addition, a control valve 411, a first electronic expansion valve 310 and a second electronic expansion valve 320 are provided, and a first refrigerant circulation loop is formed between the outdoor unit 100, the control valve 411, the first indoor heat exchanger 210 and the first electronic expansion valve 310, and a second refrigerant circulation loop is formed between the outdoor unit 100, the second indoor heat exchanger 220 and the second electronic expansion valve 320.

[0057] Specifically, when the control valve 411 and the first electronic expansion valve 310 are both in the open state, in the heating mode, the refrigerant discharged by the compressor will enter the first indoor heat exchanger 210 through the gas pipe 410 for condensation, and the condensed refrigerant will flow to the outdoor heat exchanger of the outdoor unit 100 through the liquid pipe 430.

[0058] In addition, when the second electronic expansion valve 320 is in the open state, in the heating mode, the refrigerant discharged by the compressor will enter the second indoor heat exchanger 220 through the high and low pressure pipes 420 for condensation, and the condensed refrigerant will flow to the outdoor heat exchanger of the outdoor unit 100 through the liquid pipe 430.

[0059] It should be noted that, regarding the first indoor heat exchanger 210 and the second indoor heat exchanger 220, the heat exchange area of ​​the first indoor heat exchanger 210 and the heat exchange area of ​​the second indoor heat exchanger 220 may be the same or different, and the embodiment of the present application does not specifically limit this.

[0060] Among them, when the heat exchange area of ​​the first indoor heat exchanger 210 is larger than the heat exchange area of ​​the second indoor heat exchanger 220, since only the second electronic expansion valve 320 can be opened during low-temperature startup, the refrigerant does not flow through the first indoor heat exchanger 210 with a larger heat exchange area, but only flows through the second indoor heat exchanger 220 with a smaller heat exchange area, thereby better reducing the length of the pipeline and the inner heat exchange area through which the refrigerant passes during low-temperature startup, and further quickly improving the exhaust superheat and exhaust temperature, thereby increasing the oil separation efficiency.

[0061] It can be understood that the control valve 411 can be set at the outdoor unit 100, and the first electronic expansion valve 310 and the second electronic expansion valve 320 can be set at the indoor unit; wherein the control valve 411 can be a shut-off valve or other types of valves.

[0062] Based on the hardware structure of the air conditioner in each of the above-mentioned embodiments, various embodiments of the control method of the air conditioner of the present application are respectively proposed below.

[0063] like Figure 2 As shown, Figure 2 It is a flowchart of a control method of an air conditioner provided by an embodiment of the present application; the control method of the air conditioner may include but is not limited to step S210, step S220 and step S230.

[0064] Step S210, in response to a heating start instruction, obtaining an outdoor ambient temperature;

[0065] Step S220: When the outdoor ambient temperature is lower than the first preset temperature, the air conditioner is controlled to enter the half-volume control logic;

[0066] Step S230, in the process of executing the half-volume control logic, close the control valve and the first electronic expansion valve to stop the refrigerant discharged from the outdoor unit from flowing through the first indoor heat exchanger, and open the second electronic expansion valve to allow the refrigerant discharged from the outdoor unit to flow through the second indoor heat exchanger.

[0067] In one embodiment, when the heating mode is started under low temperature conditions, the air conditioner of the embodiment of the present application will close the control valve and the first electronic expansion valve, so that the refrigerant discharged from the compressor cannot flow through the first indoor heat exchanger for condensation. At the same time, the air conditioner will open the second electronic expansion valve, so that the refrigerant discharged from the compressor will enter the second indoor heat exchanger through the high and low pressure pipes for condensation, and the refrigerant after condensation will flow to the outdoor heat exchanger of the outdoor unit through the liquid pipe.

[0068] Among them, the above-mentioned heating start instruction may be a heating start instruction after defrosting in the heating mode. For example, when executing the heating mode, frost may occur on the outdoor heat exchanger. In this regard, the air conditioner will respond to the execution of the defrost mode, and will respond to generate a heating start instruction after the execution of the defrost mode is completed, and will restart the execution of the heating mode according to the heating start instruction. In addition, the above-mentioned heating start instruction may also be a heating start instruction in the shutdown state. For example, the user sends a heating start instruction to the air conditioner when the air conditioner is in the shutdown state. The above-mentioned heating start instruction may also be an instruction in other scenarios, and the embodiments of the present application do not specifically limit this.

[0069] In addition, it should be noted that the above-mentioned half-volume control logic refers to the low-volume control logic or the reduced-volume control logic, that is, when there are multiple indoor heat exchangers, only some of the indoor heat exchangers are turned on, so that the refrigerant only flows through some of the indoor heat exchangers.

[0070] In addition, when the indoor unit includes a first indoor heat exchanger and a second indoor heat exchanger, the normal operation logic refers to turning on the first indoor heat exchanger and the second indoor heat exchanger at the same time, that is, the refrigerant flows through the first indoor heat exchanger and the second indoor heat exchanger at the same time.

[0071] It should be noted that when the heat exchange area of ​​the first indoor heat exchanger is larger than that of the second indoor heat exchanger, since only the second electronic expansion valve can be opened during low-temperature startup, the refrigerant does not flow through the first indoor heat exchanger with a larger heat exchange area, but only flows through the second indoor heat exchanger with a smaller heat exchange area. This can better reduce the length of the pipeline and the inner heat exchange area through which the refrigerant passes during low-temperature startup, further quickly improve the exhaust superheat and exhaust temperature, and increase the oil separation efficiency.

[0072] It can be understood that, regarding the above-mentioned first preset temperature, its value can be pre-set, and the embodiment of the present application does not specifically limit the value of the first preset temperature.

[0073] It is worth noting that the embodiment of the present application can reduce the length of the copper tube to which the refrigeration oil is attached by closing the control valve and the first electronic expansion valve during low-temperature startup, and by reducing the length of the pipeline that the refrigerant passes through during low-temperature startup, thereby reducing the loss of refrigeration oil caused by the length of the pipeline; in addition, it can also reduce the inner heat exchange area at the time of startup, reduce the temperature loss of the hot refrigerant, and allow the high-temperature refrigerant to circulate back to the outdoor unit quickly, thereby quickly increasing the compressor exhaust temperature and improving the oil separation efficiency. Therefore, the embodiment of the present application can solve the problem of slow exhaust superheat establishment speed caused by insufficient compressor oil return and heat loss in the initial startup caused by the invariable heat exchange area of ​​the indoor unit. Compared with the traditional solution, it can quickly increase the exhaust superheat and exhaust temperature, increase the oil separation efficiency, reduce the heat loss during startup, reduce the amount of lubricating oil adsorbed by the inner wall of the pipeline, and improve reliability.

[0074] In addition, it should be noted that the above step S220 may include but is not limited to the following steps: Figure 3 The implementation of entering the half-volume control logic after defrosting in the heating mode shown in the figure may also include but is not limited to the following: Figure 4 The implementation of the half-volume control logic after the low-temperature start is shown as follows:

[0075] like Figure 3 As shown, Figure 3 It is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application; the specific entry conditions of the half-volume control logic in the above-mentioned step S220 may include but are not limited to step S310 and step S320.

[0076] Step S310, determining that the air conditioner is in a heating mode and has ended a defrosting mode, obtaining the outdoor ambient temperature and the condensing temperature, evaporating temperature, and exhaust temperature of the air conditioner;

[0077] Step S320: When the outdoor ambient temperature is lower than the first preset temperature, the difference between the condensing temperature and the evaporating temperature is lower than the second preset temperature, and the exhaust temperature is lower than the third preset temperature, the air conditioner is controlled to enter the semi-volume control logic.

[0078] In one embodiment, when the heating mode is executed, frost may form on the outdoor heat exchanger. In this regard, the air conditioner will respond to execute the defrost mode. When the air conditioner determines that the defrost mode is over, it will respond to the heating start instruction to obtain the outdoor ambient temperature and the condensing temperature, evaporating temperature and exhaust temperature of the air conditioner. If the outdoor ambient temperature is lower than the first preset temperature, it indicates that the current environment is a low temperature environment. If the difference between the condensing temperature and the evaporating temperature is lower than the second preset temperature and the exhaust temperature is lower than the third preset temperature, it indicates that the current heating capacity of the air conditioner is poor and the energy consumption is high. In this regard, the air conditioner will enter the semi-volume control logic, that is, only the second indoor heat exchanger is turned on during the low-temperature heating start.

[0079] It can be understood that, regarding the above-mentioned second preset temperature and third preset temperature, their values ​​can be pre-set, and the embodiment of the present application does not specifically limit the values ​​of the second preset temperature and the third preset temperature.

[0080] like Figure 4 As shown, Figure 4 It is a flow chart of a method for controlling an air conditioner provided by another embodiment of the present application; the specific entry conditions of the half-volume control logic in the above-mentioned step S220 may include but are not limited to step S410 and step S420.

[0081] Step S410, obtaining the outdoor ambient temperature and the time interval between the current time and the last power-on time;

[0082] Step S420: When the outdoor ambient temperature is lower than the first preset temperature and the time interval is greater than the first preset duration, the air conditioner is controlled to enter a half-volume control logic.

[0083] In one embodiment, when the air conditioner is shut down for a long time, problems such as refrigerant leakage, refrigerant migration or refrigerant system blockage may occur, which will cause the heating capacity of the air conditioner to be poor. If it is started in a low-temperature environment at this time, the air conditioner will enter the semi-volume control logic, that is, after being shut down for a long time and during the low-temperature heating startup, only the second indoor unit heat exchanger is turned on.

[0084] It can be understood that, regarding the above-mentioned first preset time length, its value can be pre-set, and the embodiment of the present application does not specifically limit the value of the first preset time length.

[0085] In addition, if Figure 5 As shown, Figure 5 It is a flow chart of a control method for an air conditioner provided by another embodiment of the present application; the specific steps of determining in the above step S310 that the air conditioner has completed the heating mode and ended the defrost mode may include but are not limited to step S510 and step S520.

[0086] Step S510, after the air conditioner executes the heating mode and the defrosting mode in sequence, obtaining the condenser outlet temperature and the condenser middle temperature of the outdoor unit;

[0087] Step S520: When the condenser outlet temperature is lower than the fourth preset temperature and the condenser middle temperature is lower than the fifth preset temperature, it is determined that the air conditioner defrosting is finished.

[0088] In one embodiment, after the heating mode is executed, during the defrost mode, if the detected condenser outlet temperature of the outdoor unit is less than the fourth preset temperature and the middle temperature of the condenser is less than the fifth preset temperature, it is determined that the air conditioner defrost is completed.

[0089] It can be understood that, regarding the fourth preset temperature and the fifth preset temperature mentioned above, their values ​​can be pre-set, and the embodiment of the present application does not specifically limit the values ​​of the fourth preset temperature and the fifth preset temperature.

[0090] In addition, if Figure 6 As shown, Figure 6 This is a flow chart of a control method for an air conditioner provided in another embodiment of the present application; after closing the control valve and the first electronic expansion valve, and opening the second electronic expansion valve, the control method further includes but is not limited to step S610 and step S620.

[0091] Step S610, detecting the exhaust temperature and condensation temperature of the air conditioner;

[0092] Step S620: When the exhaust temperature is greater than the sixth preset temperature and the condensing temperature is greater than the seventh preset temperature, the air conditioner is controlled to exit the half-volume control logic.

[0093] In one embodiment, after closing the control valve and the first electronic expansion valve, and opening the second electronic expansion valve, the air conditioner will continue to detect the exhaust temperature and condensing temperature of the air conditioner. If the exhaust temperature is greater than the sixth preset temperature and the condensing temperature is greater than the seventh preset temperature, it indicates that the heating capacity of the air conditioner has been restored, and the half-volume control logic can be exited.

[0094] It can be understood that, regarding the sixth preset temperature and the seventh preset temperature mentioned above, their values ​​can be pre-set, and the embodiment of the present application does not specifically limit the values ​​of the sixth preset temperature and the seventh preset temperature.

[0095] In addition, if Figure 7 As shown, Figure 7 It is a flow chart of a method for controlling an air conditioner provided in another embodiment of the present application; regarding the opening logic of the second electronic expansion valve in the above-mentioned step S230, it includes but is not limited to step S710 and step S720.

[0096] Step S710: When the second electronic expansion valve remains closed, the compressor is controlled to operate according to a preset platform frequency, and a bypass line of the compressor is opened to enable the compressor to perform an internal self-circulating oil return operation;

[0097] Step S720: Detect the exhaust temperature and condensing temperature of the air conditioner, and when the difference between the exhaust temperature and the condensing temperature is greater than an eighth preset temperature, open the second electronic expansion valve.

[0098] In one embodiment, in the process of executing the half-volume control logic, the control valve, the first electronic and the second electronic expansion valves can all be closed first; then, the air conditioner will control the operation of the compressor and start to open the bypass line of the compressor, allowing the gas on the high-pressure side to bypass part of the system and flow directly into the low-pressure side, so that there is no need to pass through the indoor unit at the very beginning of startup, thereby achieving rapid oil return and improving oil separation efficiency; at this time, the difference between the exhaust temperature and the condensing temperature of the air conditioner is detected in real time. If the difference is greater than the eighth preset temperature, the second electronic expansion valve will be opened to allow the refrigerant discharged from the outdoor unit to flow through the second indoor unit heat exchanger.

[0099] It can be understood that, regarding the eighth preset temperature mentioned above, its value can be pre-set, and the embodiment of the present application does not specifically limit the value of the eighth preset temperature.

[0100] In addition, if Figure 8 As shown, Figure 8 It is a flow chart of a control method for an air conditioner provided by another embodiment of the present application; after opening the second electronic expansion valve, the control method further includes but is not limited to step S810 and step S820.

[0101] Step S810: During the execution of the half-volume control logic, the compressor is controlled to operate at an operating frequency greater than a preset frequency and continuously operate for a second preset time period;

[0102] Step S820, detecting the air intake temperature and evaporation temperature of the air conditioner, when the difference between the air intake temperature and the evaporation temperature is greater than the ninth preset temperature, and the difference between the exhaust temperature and the condensation temperature is greater than the tenth preset temperature, controlling the air conditioner to exit the half-volume control logic.

[0103] In one embodiment, the air conditioner will continue to operate for a period of time at an operating frequency greater than a preset frequency with the control valve and the first electronic expansion valve closed and the second electronic expansion valve opened. After reaching the second preset time, if the difference between the intake temperature and the evaporation temperature is greater than the ninth preset temperature and the difference between the exhaust temperature and the condensation temperature is greater than the tenth preset temperature, it indicates that the heating capacity of the air conditioner has been restored and the oil return efficiency has been high. In this regard, the air conditioner will be controlled to exit the half-volume control logic.

[0104] It can be understood that, regarding the ninth preset temperature and the tenth preset temperature mentioned above, their values ​​can be pre-set, and the embodiment of the present application does not specifically limit the values ​​of the ninth preset temperature and the tenth preset temperature.

[0105] In one embodiment, controlling the air conditioner to exit the half-volume control logic includes: opening a control valve and a first electronic expansion valve so that the refrigerant exhausted from the outdoor unit begins to flow through the first indoor unit heat exchanger.

[0106] Based on the control methods of the air conditioner in the above-mentioned embodiments, overall embodiments of the control method of the air conditioner of the present application are respectively proposed below.

[0107] The embodiment of the present application can ensure reliable startup during low-temperature heating. By combining the valve bodies of the internal and external machines to reduce the circulation pipeline volume during low-temperature startup, the problem of slow exhaust superheat establishment caused by insufficient compressor oil return and heat loss in the initial startup due to the invariable heat exchange area of ​​the internal machine can be solved. Compared with the traditional solution, the exhaust superheat and exhaust temperature can be quickly improved to increase the oil separation efficiency, reduce the heat loss during startup, reduce the amount of lubricating oil adsorbed by the inner wall of the pipeline, and improve reliability. Specifically, it includes but is not limited to Figures 9 to 11 The various implementation methods are as follows:

[0108] like Fig. 9 As shown, Fig. 9 This is an overall flow chart of a method for controlling an air conditioner provided by an embodiment of the present application, including but not limited to the following steps:

[0109] Step S910, after the air conditioner executes the heating mode and the defrosting mode in sequence, a heating start instruction is received;

[0110] Step S920: when the condenser outlet temperature is lower than the fourth preset temperature and the condenser middle temperature is lower than the fifth preset temperature, it is determined that the air conditioner defrosting is finished;

[0111] Step S930, after determining that the air conditioner defrost is finished, when the outdoor ambient temperature is lower than the first preset temperature, the difference between the condensation temperature and the evaporation temperature is lower than the second preset temperature, and the exhaust temperature is lower than the third preset temperature, the air conditioner is controlled to enter the half-volume control logic;

[0112] Step S940, in the process of executing the half-volume control logic, close the control valve and the first electronic expansion valve to stop the refrigerant discharged from the outdoor unit from flowing through the first indoor heat exchanger, and open the second electronic expansion valve to allow the refrigerant discharged from the outdoor unit to flow through the second indoor heat exchanger.

[0113] Step S950: When the exhaust temperature is greater than the sixth preset temperature and the condensing temperature is greater than the seventh preset temperature, the control valve and the first electronic expansion valve are opened to allow the refrigerant exhausted from the outdoor unit to begin to flow through the first indoor unit heat exchanger.

[0114] In one embodiment, for defrost control in heating mode:

[0115] After defrosting in heating mode is completed, the outdoor unit condenser outlet temperature T3, the outdoor unit condenser middle temperature T3b and the outdoor ambient temperature T4 are detected. When it is detected that T3 is less than C4℃ and T3b is less than C5℃, it means that defrosting is completed; then, when T4<C1℃ such as -10℃, and the condensing temperature TC-evaporating temperature Te<C2℃, and the exhaust temperature TP<C3℃ such as 50℃, the half-volume control logic is entered.

[0116] When heating is started, the stop valve of the gas pipe of the outdoor unit, that is, the above-mentioned control valve, is closed, and the main electronic expansion valve of the main evaporator of the indoor unit, that is, the above-mentioned first electronic expansion valve, is closed, and the other valve bodies are controlled normally. When the condensing temperature TC>C7 such as 40℃ and the exhaust temperature TP>C6 such as 55℃ are detected, the half-volume control is exited and the whole machine is controlled according to normal logic. The stop valve of the gas pipe of the outdoor unit and the main electronic expansion valve of the main evaporator of the indoor unit are opened, so that the refrigerant discharged from the outdoor unit begins to flow through the first indoor unit heat exchanger, and then the defrost mode is entered again and the next judgment cycle is entered.

[0117] like Fig.10 As shown, Fig.10 This is an overall flow chart of a method for controlling an air conditioner provided by another embodiment of the present application, including but not limited to the following steps:

[0118] Step S1010, receiving a heating start instruction;

[0119] Step S1020: When the outdoor ambient temperature is lower than the first preset temperature and the time interval between the current moment and the last power-on moment is greater than the first preset time, the air conditioner is controlled to enter the half-volume control logic;

[0120] Step S1030: during the execution of the half-volume control logic, close the control valve and the first electronic expansion valve to stop the refrigerant discharged from the outdoor unit from flowing through the first indoor heat exchanger, and open the second electronic expansion valve to allow the refrigerant discharged from the outdoor unit to flow through the second indoor heat exchanger;

[0121] Step S1040: When the exhaust temperature is greater than the sixth preset temperature and the condensing temperature is greater than the seventh preset temperature, the control valve and the first electronic expansion valve are opened to allow the refrigerant exhausted from the outdoor unit to begin to flow through the first indoor unit heat exchanger.

[0122] In one embodiment, for low temperature start control:

[0123] When the last startup time of the whole machine is greater than 10 hours and T4 is less than C1℃, the low-temperature half-volume startup cycle control logic is entered; the stop valve of the gas pipe of the whole machine outdoor unit is closed, the main electronic expansion valve of the main evaporator of the indoor unit is closed, and the compressor starts running;

[0124] When it is detected that the exhaust temperature TP>C6 such as 45℃ and the high-pressure condensing temperature TC>C7 such as 30℃, the gas pipe stop valve of the outdoor unit and the main electronic expansion valve of the indoor unit are opened, and the whole machine enters normal control.

[0125] like Fig.11 As shown, Fig.11 This is an overall flow chart of a method for controlling an air conditioner provided by another embodiment of the present application, including but not limited to the following steps:

[0126] Step S1110, receiving a heating start instruction;

[0127] Step S1120: When the outdoor ambient temperature is lower than the first preset temperature, the difference between the condensing temperature and the evaporating temperature is lower than the second preset temperature, and the exhaust temperature is lower than the third preset temperature, the air conditioner is controlled to enter the half-volume control logic;

[0128] Step S1130: during the execution of the half-volume control logic, close the control valve, the first electronic expansion valve, and the second electronic expansion valve;

[0129] Step S1140, controlling the compressor to operate according to a preset platform frequency, and opening the bypass line of the compressor so that the compressor performs an internal self-circulating oil return operation;

[0130] Step S1150: when the difference between the exhaust temperature and the condensing temperature is greater than an eighth preset temperature, open the second electronic expansion valve;

[0131] Step S1160, controlling the compressor to operate at an operating frequency greater than a preset frequency, and continuously operating for a second preset time period;

[0132] Step S1170: When the difference between the suction temperature and the evaporation temperature is greater than the ninth preset temperature, and the difference between the exhaust temperature and the condensation temperature is greater than the tenth preset temperature, the air conditioner is controlled to exit the half-volume control logic.

[0133] The control method of the air conditioner based on the above embodiments has the following technical effects:

[0134] First, non-essential pipelines can be closed to reduce the length of the refrigerant flow path and reduce the loss of refrigeration oil adhering to the pipe wall; among them, the main heat exchanger of the internal unit can be closed to reduce the heat loss in the startup stage and the defrosting stage to quickly increase the compressor exhaust temperature and exhaust superheat; in addition, half-volume startup can effectively increase the effective circulating refrigerant volume of the system and extend the frosting time.

[0135] Based on the control methods of the air conditioner in the above-mentioned embodiments, various embodiments of the controller, air conditioner, computer-readable storage medium and computer program product of the present application are respectively proposed below.

[0136] like Fig.12 As shown, Fig.12 is a schematic diagram of a controller for executing a control method for an air conditioner provided by an embodiment of the present application. The controller 500 implemented in the present application includes: a processor 510, a memory 520, and a computer program stored in the memory 520 and executable on the processor 510, wherein: Fig.12 In the figure, a processor 510 and a memory 520 are taken as an example.

[0137] The processor 510 and the memory 520 may be connected via a bus or other means. Fig.12 The example of connecting through bus is taken in the following.

[0138] The memory 520, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 520 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 520 may optionally include a memory 520 remotely arranged relative to the processor 510, and these remote memories 520 may be connected to the controller 500 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0139] Those skilled in the art will understand that Fig.12 The device structure shown in the figure does not constitute a limitation on the controller 500, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0140] exist Fig.12 In the controller 500 shown, the processor 510 can be used to call the control program stored in the memory 520, so as to implement the above-mentioned air conditioner control method. Specifically, the non-transient software program and instructions required to implement the air conditioner control method of the above-mentioned embodiment are stored in the memory 520, and when executed by the processor 510, the air conditioner control method of the above-mentioned embodiment is executed.

[0141] It is worth noting that since the controller 500 of the embodiment of the present application can execute the control method of the air conditioner of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the controller 500 of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the air conditioner of any of the above-mentioned embodiments.

[0142] In addition, an embodiment of the present application further provides an air conditioner, which includes the controller of the above embodiment.

[0143] It is worth noting that since the air conditioner of the embodiment of the present application includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the control method of the air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the air conditioner of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the air conditioner of any of the above-mentioned embodiments.

[0144] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above-described air conditioner control method. Figures 2 to 11 The method steps in .

[0145] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the air conditioner of any of the above-mentioned embodiments.

[0146] In addition, an embodiment of the present application further provides a computer program product, including a computer program or a computer instruction, the computer program or the computer instruction is stored in a computer-readable storage medium, the processor of the computer device reads the computer program or the computer instruction from the computer-readable storage medium, and the processor executes the computer program or the computer instruction, so that the computer device executes the above-described air conditioner control method. Figures 2 to 11 The method steps in .

[0147] It is worth noting that since the computer program product of the embodiments of the present application can execute the control method of the air conditioner of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer program product of the embodiments of the present application can refer to the specific implementation methods and technical effects of the control method of the air conditioner of any of the above-mentioned embodiments.

[0148] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0149] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0150] In several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of apparatuses or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0151] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0152] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises an outdoor unit, a first indoor unit heat exchanger, a second indoor unit heat exchanger, a control valve, a first electronic expansion valve and a second electronic expansion valve; a first refrigerant circulation loop is formed between the outdoor unit, the control valve, the first indoor unit heat exchanger and the first electronic expansion valve, and a second refrigerant circulation loop is formed between the outdoor unit, the second indoor unit heat exchanger and the second electronic expansion valve; the method comprises: In response to a heating start instruction, obtaining an outdoor ambient temperature; When the outdoor environment temperature is lower than a first preset temperature, controlling the air conditioner to enter a half-volume control logic; During the execution of the half-volume control logic, the control valve and the first electronic expansion valve are closed to stop the refrigerant discharged from the outdoor unit from flowing through the first indoor heat exchanger, and the second electronic expansion valve is opened to allow the refrigerant discharged from the outdoor unit to flow through the second indoor heat exchanger.

2. The method according to claim 1, characterized in that When the outdoor environment temperature is lower than a first preset temperature, controlling the air conditioner to enter a half-volume control logic comprises: Determine that the air conditioner is in a heating mode and ends a defrosting mode, and obtain an outdoor ambient temperature and a condensing temperature, an evaporating temperature, and an exhaust temperature of the air conditioner; When the outdoor ambient temperature is lower than a first preset temperature, the difference between the condensing temperature and the evaporating temperature is lower than a second preset temperature, and the exhaust temperature is lower than a third preset temperature, the air conditioner is controlled to enter a semi-volume control logic.

3. The method according to claim 2, characterized in that The step of determining that the air conditioner has completed the defrosting mode after executing the heating mode includes: After the air conditioner executes the heating mode and the defrosting mode in sequence, obtaining the condenser outlet temperature and the condenser middle temperature of the outdoor unit; When the condenser outlet temperature is lower than a fourth preset temperature and the condenser middle temperature is lower than a fifth preset temperature, it is determined that defrosting of the air conditioner is completed.

4. The method according to claim 1, characterized in that When the outdoor environment temperature is lower than a first preset temperature, controlling the air conditioner to enter a half-volume control logic comprises: Get the outdoor ambient temperature and the time interval between the current time and the last power-on time; When the outdoor environment temperature is lower than a first preset temperature and the time interval is greater than a first preset duration, the air conditioner is controlled to enter a semi-volume control logic.

5. The method according to claim 1, characterized in that After opening the second electronic expansion valve, the method further includes: detecting the exhaust temperature and condensing temperature of the air conditioner; When the exhaust temperature is greater than a sixth preset temperature and the condensing temperature is greater than a seventh preset temperature, the air conditioner is controlled to exit the semi-volume control logic.

6. The method according to claim 1, characterized in that The step of opening the second electronic expansion valve comprises: When the second electronic expansion valve remains closed, the compressor is controlled to operate according to a preset platform frequency, and a bypass line of the compressor is opened so that the compressor performs an internal self-circulating oil return operation; The exhaust temperature and the condensing temperature of the air conditioner are detected, and when the difference between the exhaust temperature and the condensing temperature is greater than an eighth preset temperature, the second electronic expansion valve is opened.

7. The method according to claim 6, characterized in that After opening the second electronic expansion valve, the method further includes: In the process of executing the semi-volume control logic, controlling the compressor to operate at an operating frequency greater than a preset frequency and continuously operating for a second preset time period; The air intake temperature and the evaporation temperature of the air conditioner are detected. When the difference between the air intake temperature and the evaporation temperature is greater than a ninth preset temperature and the difference between the exhaust temperature and the condensation temperature is greater than a tenth preset temperature, the air conditioner is controlled to exit the semi-volume control logic.

8. The method according to claim 5 or 7, characterized in that: The controlling the air conditioner to exit the half-volume control logic comprises: The control valve and the first electronic expansion valve are opened to allow the refrigerant exhausted from the outdoor unit to begin to flow through the first indoor unit heat exchanger.

9. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the air conditioner control method according to any one of claims 1 to 8 when executing the computer program.

10. An air conditioner, characterized in that: Comprising a controller as claimed in claim 9.

11. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method of the air conditioner according to any one of claims 1 to 8.

12. A computer program product, comprising a computer program or computer instructions, characterized in that The computer program or the computer instructions are stored in a computer-readable storage medium, and the processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium. The processor executes the computer program or the computer instructions, so that the computer device executes the air conditioner control method as described in any one of claims 1 to 8.

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