Multi-split system, control method thereof, controller, medium and product

Abstract

The embodiment of the invention provides a multi-split system and a control method thereof, a controller, a medium and a product, the multi-split system comprises an outdoor unit, an air conditioner indoor unit and a water tank indoor unit, the outdoor unit comprises a compressor, an outdoor heat exchanger and a valve assembly, and the valve assembly comprises a first reversing valve, a second reversing valve and a third reversing valve; the method comprises the steps that a target refrigerating and heating water mode and a priority control instruction of the multi-split system are obtained, and the priority control instruction comprises an air conditioner refrigerating priority instruction or a water tank heating water priority instruction; and the rotating speed of an outdoor unit fan is controlled according to the target refrigerating and heating water mode and the priority control instruction. Due to the fact that the rotating speed of the outdoor unit fan can be controlled through the target refrigerating and heating water mode and the priority control instruction, adjustment of the exhaust pressure can be achieved, cooperative operation of air conditioner refrigerating and domestic hot water supply is achieved, conflicts between air conditioner refrigerating and domestic hot water supply are avoided, and the diversified requirements of users are met.

Description

Technical Field

[0001] This application relates to the technical field of multi-connected systems, and particularly to a multi-connected system, its control method, controller, medium, and product. Background Art

[0002] In the related art, multi-connected air-conditioning systems are increasingly widely used, and their end combinations are becoming more diverse, capable of fully adapting to various user usage scenarios. For example, this system can be paired with the end of an air-conditioning indoor unit or connected to a water tank for use. This heat pump system has powerful multi-functional service capabilities, capable of not only meeting the air-conditioning needs of different rooms but also providing domestic hot water services. Specifically, the system consists of an outdoor unit, multiple air-conditioning indoor units, and an external disk water tank. During actual operation, the air-conditioning indoor unit is responsible for providing comfortable air-conditioning services, while the water tank undertakes the responsibility of supplying hot water.

[0003] However, when the heat pump system simultaneously performs refrigeration and hot water production tasks, if the hot water production effect is given priority, the exhaust pressure will correspondingly increase, which will lead to a weakened refrigeration effect and a significant increase in system power consumption, resulting in energy waste; conversely, if the refrigeration effect is given priority, the exhaust pressure needs to be controlled at a lower level, and at this time, the hot water production rate will decrease accordingly. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. For this reason, this application proposes a multi-connected system, its control method, controller, medium, and product, aiming to achieve the coordinated operation of air-conditioning refrigeration and domestic hot water supply without conflict, meeting the diversified needs of users.

[0005] In a first aspect, an embodiment of this application provides a control method for a multi-connected system. The multi-connected system includes an outdoor unit, an air-conditioning indoor unit, and a water tank indoor unit. The outdoor unit includes a compressor, an outdoor heat exchanger, and a valve assembly. The valve assembly includes a first reversing valve, a second reversing valve, and a third reversing valve. The first reversing valve is connected to the air-conditioning indoor unit and the suction port of the compressor. The second reversing valve is connected to the exhaust port of the compressor and the water tank indoor unit. The third reversing valve is connected to the exhaust port, the suction port of the compressor, and the outdoor heat exchanger. The outdoor heat exchanger is also respectively connected to the air-conditioning indoor unit and the water tank indoor unit through a main expansion valve. The method includes:

[0006] Obtain the target refrigeration and hot water production mode and the priority control instruction of the multi-connected system, where the priority control instruction includes an air-conditioning refrigeration priority instruction or a water tank hot water production priority instruction;

[0007] Control the rotation speed of the outdoor unit fan according to the target refrigeration and hot water production mode and the priority control instruction.

[0008] According to some embodiments of the present application, the target refrigeration and hot water supply mode includes one of the following:

[0009] The first refrigeration and hot water supply mode, in which the first reversing valve connects the air conditioner indoor unit and the suction port of the compressor, the second reversing valve connects the discharge port of the compressor and the water tank indoor unit, the third reversing valve connects the outdoor heat exchanger and the suction port of the compressor, and the main expansion valve is in the conducting state;

[0010] The second refrigeration and hot water supply mode, in which the first reversing valve connects the air conditioner indoor unit and the suction port of the compressor, the second reversing valve connects the discharge port of the compressor and the water tank indoor unit, the third reversing valve connects the outdoor heat exchanger and the suction port of the compressor, and the main expansion valve is in the cut-off state;

[0011] The third refrigeration and hot water supply mode, in which the first reversing valve connects the air conditioner indoor unit and the suction port of the compressor, the second reversing valve connects the discharge port of the compressor and the water tank indoor unit, the third reversing valve connects the discharge port of the compressor and the outdoor heat exchanger, and the main expansion valve is in the conducting state.

[0012] According to some embodiments of the present application, controlling the rotation speed of the outdoor fan according to the target refrigeration and hot water supply mode and the priority control instruction includes:

[0013] In the case of the first refrigeration and hot water supply mode, when the priority control instruction is the air conditioner refrigeration priority instruction or the water tank hot water supply priority instruction, obtain the ambient temperature and the outdoor heat exchanger coil temperature of the outdoor unit heat exchanger;

[0014] Determine the fan speed change value according to the ambient temperature and the outdoor heat exchanger coil temperature;

[0015] Adjust the rotation speed of the outdoor fan based on the fan speed change value between the minimum rotation speed value and the maximum rotation speed value.

[0016] According to some embodiments of the present application, determining the fan speed change value according to the ambient temperature and the outdoor heat exchanger coil temperature includes one of the following:

[0017] Determine the first difference between the ambient temperature and the first preset parameter. When the outdoor heat exchanger coil temperature is less than the minimum value of the first difference and the second preset parameter, use the difference between the minimum value of the first difference and the second preset parameter and the outdoor heat exchanger coil temperature as the fan speed change value;

[0018] Determine a second difference between the ambient temperature and a third preset parameter. When the temperature of the outdoor unit heat exchanger coil is greater than the minimum value of the second difference and a fourth preset parameter, use a constant multiple of the difference between the minimum value of the second difference and the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil as the fan speed change value;

[0019] When the temperature of the outdoor unit heat exchanger coil is greater than or equal to the minimum value of the first difference and the second preset parameter, and less than or equal to the minimum value of the second difference and the fourth preset parameter, determine that the fan speed change value is zero.

[0020] According to some embodiments of the present application, the controlling the speed of the outdoor fan according to the target cooling and heating water mode and the priority control instruction includes:

[0021] In the case of the second cooling and heating water mode, when the priority control instruction is the air conditioner cooling priority instruction or the water tank heating water priority instruction, obtain the ambient temperature and the current power module detection temperature of the electronic control PCB board;

[0022] Determine the target power module detection temperature of the electronic control PCB board according to the ambient temperature;

[0023] Determine the fan speed change value according to the current power module detection temperature and the target power module detection temperature;

[0024] Between the minimum speed value and the maximum speed value, adjust the speed of the outdoor fan based on the fan speed change value.

[0025] According to some embodiments of the present application, the determining the target power module detection temperature of the electronic control PCB board according to the ambient temperature includes:

[0026] Determine a corresponding first temperature range according to the ambient temperature;

[0027] Determine the target power module detection temperature of the electronic control PCB board according to the first temperature range;

[0028] Wherein, the target power module detection temperature corresponding to the first temperature range at the current gear under the air conditioner cooling priority instruction is equal to the target power module detection temperature corresponding to the first temperature range at the lower gear under the water tank heating water priority instruction.

[0029] According to some embodiments of the present application, the determining the fan speed change value according to the current power module detection temperature and the target power module detection temperature includes:

[0030] Determine a plurality of second temperature ranges according to the target power module detection temperature;

[0031] Determine the fan speed change value according to the second temperature range where the temperature detected by the current power module is located.

[0032] According to some embodiments of the present application, the controlling the speed of the outdoor unit fan according to the target refrigeration and hot water mode and the priority control instruction includes:

[0033] In the case of the third refrigeration and hot water mode, when the priority control instruction is the air-conditioning refrigeration priority instruction or the water tank hot water priority instruction, obtain the ambient temperature and the refrigerant saturation temperature corresponding to the exhaust pressure of the compressor;

[0034] Determine the fan speed change value according to the ambient temperature and the refrigerant saturation temperature;

[0035] Adjust the speed of the outdoor unit fan based on the fan speed change value between the minimum speed value and the maximum speed value.

[0036] According to some embodiments of the present application, the determining the fan speed change value according to the ambient temperature and the refrigerant saturation temperature includes:

[0037] Determine a reference temperature, and select the maximum temperature from the ambient temperature and the reference temperature;

[0038] Determine a temperature judgment threshold according to the maximum temperature, and determine the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold;

[0039] Wherein, the reference temperature under the air-conditioning refrigeration priority instruction is less than the reference temperature under the water tank hot water priority instruction.

[0040] According to some embodiments of the present application, the determining the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold includes one of the following:

[0041] When the refrigerant saturation temperature is less than the first temperature judgment threshold, take the difference between the refrigerant saturation temperature and the first temperature judgment threshold as the fan speed change value, wherein the first temperature judgment threshold is the sum value of the maximum temperature and the fifth preset parameter;

[0042] When the refrigerant saturation temperature is greater than the second temperature judgment threshold, take a constant multiple of the difference between the refrigerant saturation temperature and the second temperature judgment threshold as the fan speed change value, wherein the second temperature judgment threshold is the sum value of the maximum temperature and the sixth preset parameter;

[0043] When the refrigerant saturation temperature is greater than or equal to the first temperature judgment threshold and less than or equal to the second temperature judgment threshold, determine that the fan speed change value is zero.

[0044] According to some embodiments of the present application, the method further includes:

[0045] Determining a corresponding third temperature range according to the ambient temperature;

[0046] Determining the maximum rotational speed value and / or the minimum rotational speed value of the outdoor unit fan according to the third temperature range.

[0047] In a second aspect, an embodiment of the present application provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor runs the computer program, it executes the control method of the multi-connected air conditioner system in the first aspect above.

[0048] In a third aspect, an embodiment of the present application provides a multi-connected air conditioner system, including the controller in the second aspect above.

[0049] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for executing the control method of the multi-connected air conditioner system as described in the first aspect above.

[0050] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program or computer instructions. The computer program or computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes the control method of the multi-connected air conditioner system as described in the first aspect above.

[0051] According to the technical solution of the embodiment of the present application, it has at least the following beneficial effects: The embodiment of the present application proposes a multi-connected air-conditioning system, its control method, controller, medium and product, which are applied to the technical field of multi-connected air-conditioning systems. The multi-connected air-conditioning system includes an outdoor unit, an air-conditioning indoor unit and a water tank indoor unit. The outdoor unit includes a compressor, an outdoor heat exchanger and a valve assembly. The valve assembly includes a first reversing valve, a second reversing valve and a third reversing valve. The first reversing valve is connected to the air-conditioning indoor unit and the suction port of the compressor. The second reversing valve is connected to the discharge port of the compressor and the water tank indoor unit. The third reversing valve is connected to the discharge port, the suction port of the compressor and the outdoor heat exchanger. The outdoor heat exchanger is also connected to the air-conditioning indoor unit and the water tank indoor unit respectively through a main expansion valve. The method includes: obtaining the target refrigeration and hot water supply mode and the priority control instruction of the multi-connected air-conditioning system, where the priority control instruction includes an air-conditioning refrigeration priority instruction or a water tank hot water supply priority instruction; controlling the rotation speed of the outdoor unit fan according to the target refrigeration and hot water supply mode and the priority control instruction. Since the embodiment of the present application can control the rotation speed of the outdoor unit fan through the target refrigeration and hot water supply mode and the priority control instruction, the exhaust pressure can be adjusted, and then the coordinated operation of air-conditioning refrigeration and domestic hot water supply can be realized, avoiding the conflict between air-conditioning refrigeration and domestic hot water supply, and meeting the diversified needs of users.

[0052] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings are used to provide a 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 to the technical solution of the present application.

[0054] Figure 1 is a schematic structural diagram of a multi-connected air-conditioning system provided by an embodiment of the present application;

[0055] Figure 2 is a flowchart of a control method of a multi-connected air-conditioning system provided by an embodiment of the present application;

[0056] Figure 3 is a flowchart of a control method of a multi-connected air-conditioning system provided by another embodiment of the present application;

[0057] Figure 4 is a flowchart of a control method of a multi-connected air-conditioning system provided by another embodiment of the present application;

[0058] Figure 5 is a flowchart of a control method of a multi-connected air-conditioning system provided by another embodiment of the present application;

[0059] Figure 6It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0060] Figure 7 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0061] Figure 8 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0062] Figure 9 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0063] Figure 10 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0064] Figure 11 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0065] Figure 12 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0066] Figure 13 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0067] Figure 14 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0068] Figure 15 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application;

[0069] Figure 16 It is a flowchart of a control method for a multi-connected air conditioner system provided by an overall embodiment of the present application;

[0070] Figure 17 It is a schematic diagram of the corresponding relationship between the ambient temperature and the temperature detected by the target power module provided by an embodiment of the present application;

[0071] Figure 18 It is a schematic diagram of a controller for executing the control method of a multi-connected air conditioner system provided by an embodiment of the present application. Detailed Description of the Embodiment

[0072] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0073] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0074] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If the first and second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0075] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0076] In some cases, the application of multi-connected air-conditioning systems is becoming increasingly widespread, and their terminal combination forms are becoming more and more diverse, which can fully adapt to various user usage scenarios. For example, the system can be paired with the terminal of the air-conditioning indoor unit or connected to a water tank for use. This heat pump system has powerful multi-functional service capabilities, which can not only meet the air-conditioning needs of different rooms but also provide domestic hot water services. Specifically, the system consists of an outdoor unit, multiple air-conditioning indoor units, and is connected to an external water tank. In actual operation, the air-conditioning indoor unit is responsible for providing comfortable air-conditioning services, while the water tank undertakes the responsibility of supplying hot water.

[0077] However, when the heat pump system simultaneously performs the tasks of refrigeration and hot water production, if the hot water production effect is given priority, the exhaust pressure will increase accordingly, which will lead to a weakening of the refrigeration effect and a significant increase in the system power consumption, thus causing energy waste; on the contrary, if the refrigeration effect is given priority, the exhaust pressure needs to be controlled at a lower level, and at this time the hot water production rate will decrease accordingly.

[0078] Based on the above situation, the embodiments of the present application propose a multi-connected system and its control method, controller, medium and product, aiming to realize the coordinated operation of air-conditioning refrigeration and domestic hot water supply without conflict, and meet the diverse needs of users.

[0079] The following further elaborates on each embodiment of the multi-connected system of the present application with reference to the drawings.

[0080] As Figure 1 shown, Figure 1It is a schematic structural diagram of a multi-connected air-conditioning system provided by an embodiment of the present application.

[0081] In one embodiment, the multi-connected air-conditioning system includes indoor-side equipment and outdoor-side equipment. Among them, the indoor-side equipment includes Figure 1 the air-conditioning indoor unit 100 and the water tank indoor unit 300 shown in Figure 1 The outdoor-side equipment includes the outdoor unit shown in

[0082] In one embodiment, as Figure 1 shown, the valve assembly includes but is not limited to the first reversing valve 510, the second reversing valve 520, the third reversing valve 530, and the main expansion valve 610. The first reversing valve 510 is connected to the suction port of the air-conditioning indoor unit 100 and the compressor 400. The second reversing valve 520 is connected to the discharge port of the compressor 400 and the water tank indoor unit 300. The third reversing valve 530 is connected to the discharge port, the suction port of the compressor 400, and one end of the outdoor heat exchanger 200. The other end of the outdoor heat exchanger 200 is respectively connected to the air-conditioning indoor unit 100 and the water tank indoor unit 300 through the main expansion valve 610.

[0083] It can be understood that for the above-mentioned first reversing valve 510, second reversing valve 520, and third reversing valve 530, they can be three-way valves or four-way valves, and the embodiments of the present application do not make specific limitations on this.

[0084] In one embodiment, the compressor 400 can be connected to the first end of the water tank indoor unit 300 through the second reversing valve 520. The second end of the water tank indoor unit 300 is connected to the first end of the air-conditioning indoor unit 100. The second end of the air-conditioning indoor unit 100 is connected to the first reversing valve 510. In addition, the compressor 400 is also connected to the first end of the outdoor heat exchanger 200 through the third reversing valve 530. The second end of the outdoor heat exchanger 200 is connected to the first end of the air-conditioning indoor unit 100 and the second end of the water tank indoor unit 300 through the main expansion valve 610. The second end of the air-conditioning indoor unit 100 is connected to the first reversing valve 510.

[0085] In one embodiment, as Figure 1 shown, the valve assembly further includes but is not limited to a plurality of sub-expansion valves 620. One end of the main expansion valve 610 is connected to the outdoor heat exchanger 200, and the other end is connected to the air-conditioning indoor unit 100 through the sub-expansion valve 620, and is connected to the water tank indoor unit 300 through the sub-expansion valve 620.

[0086] As Figure 1As shown, in the case of refrigeration without heat recovery, after the refrigerant is compressed by the compressor 400, it enters the outdoor heat exchanger 200 through the third reversing valve 530 for heat exchange and condensation. At this time, the main expansion valve 610 at the outlet of the outdoor heat exchanger 200 and the sub-expansion valve 620 at the inlet of the air conditioner indoor unit 100 are in the open state. Therefore, the condensed refrigerant enters each air conditioner indoor unit 100 through the main expansion valve 610 and the sub-expansion valve 620 for evaporation treatment. Finally, the refrigerant after evaporation treatment re-enters the compressor 400 through the first reversing valve 510 to form a cycle.

[0087] It should be noted that the refrigerant flow direction in the case of heating without heat recovery is opposite to that in the case of refrigeration without heat recovery as described above. The embodiments of the present application do not elaborate on this specifically.

[0088] In addition, for the target refrigeration and hot water supply mode of the multi-connected unit system, it may include but is not limited to the following three target refrigeration and hot water supply modes, specifically as follows:

[0089] The first refrigeration and hot water supply mode: In this mode, the outdoor heat exchanger 200 serves as an evaporator. The first reversing valve 510 connects the air conditioner indoor unit 100 and the suction port of the compressor 400. The second reversing valve 520 connects the discharge port of the compressor 400 and the water tank indoor unit 300. The third reversing valve 530 connects the outdoor heat exchanger 200 and the suction port of the compressor 400. The opening degree of the main expansion valve 610 is in the conducting state.

[0090] Specifically, when the multi-connected unit system is in the first refrigeration and hot water supply mode, after the refrigerant is compressed by the compressor 400, it enters the water tank indoor unit 300 through the second reversing valve 520 for heat exchange and condensation, and then the water in the water tank indoor unit 300 can be heated. At this time, the main expansion valve 610 and the sub-expansion valve 620 are in the open state. Therefore, the condensed refrigerant is divided into two parts. One part of the refrigerant enters each air conditioner indoor unit 100 through the sub-expansion valve 620 for evaporation treatment. Finally, the refrigerant after evaporation treatment re-enters the compressor 400 through the first reversing valve 510 to form a cycle. At the same time, the other part of the refrigerant enters the outdoor heat exchanger 200 through the main expansion valve 610 for evaporation treatment. Finally, the refrigerant after evaporation treatment re-enters the compressor 400 through the third reversing valve 530 to form a cycle.

[0091] The second refrigeration and hot water supply mode: In this mode, the outdoor heat exchanger 200 does not work. The first reversing valve 510 connects the air conditioner indoor unit 100 and the suction port of the compressor 400. The second reversing valve 520 connects the discharge port of the compressor 400 and the water tank indoor unit 300. The third reversing valve 530 connects the outdoor heat exchanger 200 and the suction port of the compressor 400. The main expansion valve 610 is in the cut-off state.

[0092] Specifically, when the multi-connected air-conditioning system is in the second refrigeration and hot water mode and the main expansion valve 610 is closed, after the refrigerant is compressed by the compressor 400, it enters the water tank indoor unit 300 through the second reversing valve 520 for heat exchange and condensation, and then the water in the water tank indoor unit 300 can be heated. At this time, the sub-expansion valve 620 is in the open state, while the main expansion valve 610 is in the closed state. Therefore, all the condensed refrigerant passes through the sub-expansion valve 620 and enters each air-conditioning indoor unit 100 for evaporation treatment. Finally, the refrigerant after evaporation treatment will re-enter the compressor 400 through the first reversing valve 510 to form a cycle. Since the main expansion valve 610 is in the closed state, the condensed refrigerant will not enter the outdoor heat exchanger 200 through the main expansion valve 610.

[0093] Third refrigeration and hot water mode: In this mode, the outdoor heat exchanger 200 serves as the condenser. The first reversing valve 510 connects the air-conditioning indoor unit 100 and the suction port of the compressor 400. The second reversing valve 520 connects the discharge port of the compressor 400 and the water tank indoor unit 300. The third reversing valve 530 connects the discharge port of the compressor 400 and the outdoor heat exchanger 200. The main expansion valve 610 is in the fully open state.

[0094] Specifically, when the multi-connected air-conditioning system is in the third refrigeration and hot water mode, after the refrigerant is compressed by the compressor 400, it is divided into two parts. One part of the refrigerant enters the outdoor heat exchanger 200 through the third reversing valve 530 for heat exchange and condensation. At this time, the main expansion valve 610 and the sub-expansion valve 620 are in the open state. Therefore, the condensed refrigerant passes through the main expansion valve 610 and the sub-expansion valve 620 corresponding to the air-conditioning indoor unit 100 and enters each air-conditioning indoor unit 100 for evaporation treatment. The other part of the refrigerant enters the water tank indoor unit 300 through the second reversing valve 520 for heat exchange and condensation, and then the water in the water tank indoor unit 300 can be heated and stored. At this time, the sub-expansion valve 620 is in the open state. Therefore, the condensed refrigerant passes through the sub-expansion valve 620 and enters each air-conditioning indoor unit 100 for evaporation treatment. Finally, for all the refrigerant after evaporation treatment in the air-conditioning indoor unit 100, it will re-enter the compressor 400 through the first reversing valve 510 to form a cycle.

[0095] Based on the hardware structure of the multi-connected air-conditioning system in the above-mentioned various embodiments, the following are the various embodiments of the control method of the multi-connected air-conditioning system of the present application.

[0096] As Figure 2 shown, Figure 2 is a flowchart of the control method of the multi-connected air-conditioning system provided by an embodiment of the present application; the control method of the multi-connected air-conditioning system may include but is not limited to step S210 and step S220.

[0097] Step S210: Obtain the target cooling and hot water heating mode and the priority control instruction of the multi-connected air-conditioning system, where the priority control instruction includes an air-conditioning cooling priority instruction or a water tank hot water heating priority instruction;

[0098] Step S220: Control the rotation speed of the outdoor unit fan according to the target cooling and hot water heating mode and the priority control instruction.

[0099] In one embodiment, the embodiment of the present application can control the rotation speed of the outdoor unit fan through the target cooling and hot water heating mode and the priority control instruction, so as to be able to adjust the exhaust pressure, and further realize the coordinated operation of air-conditioning cooling and domestic hot water supply, avoid the conflict between air-conditioning cooling and domestic hot water supply, and meet the diversified needs of users.

[0100] It can be understood that the target cooling and hot water heating mode includes: the first cooling and hot water heating mode, the second cooling and hot water heating mode, and the third cooling and hot water heating mode.

[0101] In addition, as Figure 3 shown, Figure 3 is a flowchart of a control method for a multi-connected air-conditioning system provided by another embodiment of the present application; regarding the above step S220, it may include but is not limited to step S310, step S320, and step S330.

[0102] Step S310: In the case of the first cooling and hot water heating mode, when the priority control instruction is an air-conditioning cooling priority instruction or a water tank hot water heating priority instruction, obtain the ambient temperature and the outdoor heat exchanger coil temperature of the outdoor heat exchanger;

[0103] Step S320: Determine the fan speed change value according to the ambient temperature and the outdoor heat exchanger coil temperature;

[0104] Step S330: Adjust the rotation speed of the outdoor unit fan based on the fan speed change value between the minimum rotation speed value and the maximum rotation speed value.

[0105] It can be understood that in the case where the target cooling and hot water heating mode is the first cooling and hot water heating mode, when the priority control instruction is an air-conditioning cooling priority instruction / or a water tank hot water heating priority instruction, the fan speed change value is obtained through the obtained ambient temperature and the outdoor heat exchanger coil temperature of the outdoor heat exchanger, so as to adjust the rotation speed of the outdoor unit fan according to the fan speed change value and the preset time interval within the fan speed adjustment range, that is, between the minimum rotation speed value and the maximum rotation speed value, and further be able to adjust the exhaust pressure.

[0106] It can be understood that the above time interval can be 20s, can be 40s, can be 60s, can be 90s, or can be between 20s and 90s. The embodiment of the present application does not make specific limitations on it.

[0107] It can be understood that the rotation speed of the outdoor unit fan is equal to the sum of the current rotation speed of the outdoor unit fan and the change value of the fan rotation speed.

[0108] In addition, as Figure 4 shown, Figure 4 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above step S320, it may include but is not limited to step S410 and step S420.

[0109] Step S410, determine the first difference between the ambient temperature and the first preset parameter;

[0110] Step S420, when the temperature of the outdoor heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, use the difference between the minimum value of the first difference and the second preset parameter and the temperature of the outdoor heat exchanger coil as the change value of the fan rotation speed.

[0111] It can be understood that when the temperature of the outdoor heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, it indicates that the heat exchange effect of the outdoor heat exchanger is excessive at this time. If the current rotation speed of the outdoor unit fan is maintained, the system energy consumption will increase. Therefore, based on the change value of the fan rotation speed, the rotation speed of the outdoor unit fan is adjusted to reduce the system energy consumption.

[0112] Exemplarily, when the first difference is greater than the second preset parameter, and when the temperature of the outdoor heat exchanger coil is less than the second preset parameter, calculate the difference between the second preset parameter and the temperature of the outdoor heat exchanger coil, and use the difference as the change value of the fan rotation speed.

[0113] It can be understood that regarding the above first preset parameter, it can be 4°C, it can be 7°C, it can be 8°C, or it can be between 4°C and 8°C. The embodiments of the present application do not make specific limitations on it.

[0114] It can be understood that regarding the above second preset parameter, it can be -5°C, it can be 0°C, it can be 5°C, or it can be between -5°C and 5°C. The embodiments of the present application do not make specific limitations on it.

[0115] In addition, as Figure 5 shown, Figure 5 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above step S320, it may include but is not limited to step S510 and step S520.

[0116] Step S510, determine the second difference between the ambient temperature and the third preset parameter;

[0117] Step S520: When the temperature of the outdoor unit heat exchanger coil is greater than the minimum value of the second difference and the fourth preset parameter, use a constant multiple of the difference between the minimum value of the second difference and the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil as the fan speed change value.

[0118] It can be understood that when the temperature of the outdoor unit heat exchanger is greater than the minimum value of the second difference and the fourth preset parameter, it indicates that the heat exchange effect of the outdoor unit heat exchanger is not good at this time. Therefore, based on the fan speed change value, the speed of the outdoor unit fan is adjusted to improve the heat exchange effect of the outdoor unit heat exchanger coil.

[0119] Exemplarily, when the second difference is greater than the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil is greater than the fourth preset parameter, calculate the difference between the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil, and use a constant multiple of the difference as the fan speed change value.

[0120] It can be understood that regarding the above-mentioned third preset parameter, it can be 0°C, it can be 2°C, it can be 4°C, or it can be in the range of 0°C to 4°C. The embodiments of the present application do not make specific limitations on it.

[0121] It can be understood that regarding the above-mentioned fourth preset parameter, it can be 5°C, it can be 8°C, it can be 10°C, or it can be in the range of 5°C to 10°C. The embodiments of the present application do not make specific limitations on it.

[0122] It can be understood that regarding the above-mentioned constant multiple, it can be 2 times, and it can be set according to actual needs. The embodiments of the present application do not make specific limitations on it.

[0123] In addition, as Figure 6 shown, Figure 6 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above-mentioned step S320, it may include but is not limited to step S610 and step S620.

[0124] Step S610: When the temperature of the outdoor unit heat exchanger coil is greater than or equal to the minimum value of the first difference and the second preset parameter and less than or equal to the minimum value of the second difference and the fourth preset parameter;

[0125] Step S620: Determine that the fan speed change value is zero.

[0126] It can be understood that when the temperature of the outdoor unit heat exchanger coil is greater than or equal to the minimum value of the first difference and the second preset parameter and less than or equal to the minimum value of the second difference and the fourth preset parameter, it indicates that the heat exchange effect of the outdoor unit heat exchanger is in a stable state at this time. Therefore, there is no need to adjust the speed of the outdoor unit fan.

[0127] Exemplarily, when the first difference is greater than the second preset parameter and the second difference is greater than the fourth preset parameter, when the temperature of the outdoor unit heat exchanger coil is greater than or equal to the second preset parameter and less than or equal to the fourth preset parameter, the change value of the fan speed is confirmed to be zero.

[0128] In addition, as Figure 7 shown, Figure 7 FIG. is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above step S220, it may include but is not limited to step S710, step S720, step S730, and step S740.

[0129] Step S710: In the case of the second cooling and hot water supply mode, when the priority control instruction is the air conditioner cooling priority instruction or the water tank hot water supply priority instruction, obtain the ambient temperature and the current power module detection temperature of the electronic control PCB board.

[0130] Step S720: Determine the target power module detection temperature of the electronic control PCB board according to the ambient temperature.

[0131] Step S730: Determine the change value of the fan speed according to the current power module detection temperature and the target power module detection temperature.

[0132] Step S740: Between the minimum speed value and the maximum speed value, adjust the speed of the outdoor unit fan based on the change value of the fan speed.

[0133] It can be understood that in the case where the target cooling and hot water supply mode is the second cooling and hot water supply mode, when the priority control instruction is the air conditioner cooling priority instruction / water tank hot water supply priority instruction, the target power module detection temperature can be obtained through the obtained ambient temperature, so as to obtain the change value of the fan speed according to the obtained current power module detection temperature and the target power module detection temperature. Then, within the fan speed adjustment range, that is, between the minimum speed value and the maximum speed value, the speed of the outdoor unit fan is adjusted according to the change value of the fan speed and the preset time interval, so as to realize the adjustment of the exhaust pressure.

[0134] It can be understood that the above time interval can be 20s, can be 40s, can be 60s, can be 90s, or can be between 20s and 90s. The embodiments of the present application do not make specific limitations on it.

[0135] It can be understood that the speed of the outdoor unit fan is equal to the sum of the current speed of the outdoor unit fan and the change value of the fan speed.

[0136] In addition, as Figure 8 shown, Figure 8It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above step S720, it may include but is not limited to step S810 and step S820.

[0137] Step S810: Determine a corresponding first temperature range according to the ambient temperature;

[0138] Step S820: Determine the target power module detection temperature of the electronic control PCB board according to the first temperature range.

[0139] It can be understood that each first temperature range has a corresponding target power module detection temperature of the electronic control PCB board, so that the target power module detection temperature can be determined through the first temperature range.

[0140] Exemplarily, when the ambient temperature is less than 20°C, determine that the target power module detection temperature is the first target power module detection temperature; when the ambient temperature is between 20°C and 29°C, determine that the target power module detection temperature is the second target power module detection temperature; when the ambient temperature is between 29°C and 35°C, determine that the target power module detection temperature is the third target power module detection temperature; when the ambient temperature is greater than 35°C, determine that the target power module detection temperature is the fourth target power module detection temperature.

[0141] It can be understood that the above first target power module detection temperature can be 28°C, can be 35°C, can be 40°C, or can be between 28°C and 40°C. The embodiments of the present application do not make specific limitations on it.

[0142] It can be understood that the above second target power module detection temperature can be 35°C, can be 48°C, can be 55°C, or can be between 35°C and 55°C. The embodiments of the present application do not make specific limitations on it.

[0143] It can be understood that the above third target power module detection temperature can be 45°C, can be 60°C, can be 70°C, or can be between 45°C and 70°C. The embodiments of the present application do not make specific limitations on it.

[0144] It can be understood that the above fourth target power module detection temperature can be 60°C, can be 70°C, can be 80°C, or can be between 60°C and 80°C. The embodiments of the present application do not make specific limitations on it.

[0145] It can be understood that the target power module detection temperature corresponding to the first temperature range of the current gear under the water tank hot water priority instruction is equal to the target power module detection temperature corresponding to the first temperature range of the higher gear under the water tank cold water priority instruction.

[0146] Exemplarily, if the detected temperature of the target power module corresponding to the first temperature range at the current gear under the water tank cooling water priority instruction is the detected temperature of the first target power module, then the detected temperature of the target power module under the water tank hot water priority instruction is the detected temperature of the second target power module; if the detected temperature of the target power module corresponding to the first temperature range at the current gear under the water tank cooling water priority instruction is the detected temperature of the second target power module, then the detected temperature of the target power module under the water tank hot water priority instruction is the detected temperature of the third target power module; if the detected temperature of the target power module corresponding to the first temperature range at the current gear under the water tank cooling water priority instruction is the detected temperature of the third target power module, then the detected temperature of the target power module under the water tank hot water priority instruction is the detected temperature of the fourth target power module.

[0147] In addition, as Figure 9 shown, Figure 9 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the above step S730, it may include but is not limited to step S910 and step S920.

[0148] Step S910: Determine a plurality of second temperature ranges according to the detected temperature of the target power module;

[0149] Step S920: Determine the fan speed change value according to the second temperature range where the detected temperature of the current power module is located.

[0150] Exemplarily, when the detected temperature of the current power module is greater than the sum of the detected temperature of the target power module and the first preset threshold, the speed of the outdoor unit fan is adjusted to the maximum speed; when the detected temperature of the current power module is less than or equal to the sum of the detected temperature of the target power module and the first preset threshold and greater than the sum of the detected temperature of the target power module and the second preset threshold, the fan speed change value is determined to be +20; when the detected temperature of the current power module is less than or equal to the sum of the detected temperature of the target power module and the second preset threshold and greater than the detected temperature of the target power module, the fan speed change value is determined to be 0; when the detected temperature of the current power module is less than or equal to the detected temperature of the target power module and greater than the sum of the detected temperature of the target power module and the third preset threshold, the fan speed change value is determined to be -20; when the detected temperature of the current power module is less than or equal to the sum of the detected temperature of the target power module and the third preset threshold, the fan speed change value is determined to be -40.

[0151] It can be understood that the above first preset threshold can be 10, can be 12, can be 15, or can be between 10 and 15. The embodiments of the present application do not make specific limitations thereto.

[0152] It can be understood that the above-mentioned second preset threshold value can be 2, can be 5, can be 8, or can be between 2 and 8. The embodiments of the present application do not make specific limitations thereto.

[0153] It can be understood that the above-mentioned third preset threshold value can be -2, can be -5, can be -8, or can be between -2 and -8. The embodiments of the present application do not make specific limitations thereto.

[0154] In addition, as Figure 10 shown, Figure 10 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; for the above-mentioned step S220, it may include but is not limited to step S1010, step S1020, and step S1030.

[0155] Step S1010: In the case of the third cooling and heating mode, when the priority control instruction is the air conditioner cooling priority instruction or the water tank heating priority instruction, obtain the ambient temperature and the refrigerant saturation temperature corresponding to the exhaust pressure of the compressor;

[0156] Step S1020: Determine the fan speed change value according to the ambient temperature and the refrigerant saturation temperature;

[0157] Step S1030: Adjust the speed of the outdoor unit fan based on the fan speed change value between the minimum speed value and the maximum speed value.

[0158] It can be understood that in the case where the target cooling and heating mode is the third cooling and heating mode, when the priority control instruction is the air conditioner cooling priority instruction / water tank heating priority instruction, the fan speed change value can be obtained through the obtained ambient temperature and the refrigerant saturation temperature corresponding to the exhaust pressure of the compressor, so that within the fan speed adjustment range, that is, between the minimum speed value and the maximum speed value, the speed of the outdoor unit fan is adjusted according to the fan speed change value and the preset time interval, and thus the adjustment of the exhaust pressure can be realized.

[0159] It can be understood that the above-mentioned time interval can be 20s, can be 40s, can be 60s, can be 90s, or can be between 20s and 90s. The embodiments of the present application do not make specific limitations thereto.

[0160] It can be understood that the speed of the outdoor unit fan is equal to the sum of the current speed of the outdoor unit fan and the fan speed change value.

[0161] In addition, as Figure 11 shown, Figure 11 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; for the above-mentioned step S1020, it may include but is not limited to step S1110 and step S1120.

[0162] Step S1110: Determine the reference temperature and select the maximum value from the ambient temperature and the reference temperature.

[0163] Step S1120: Determine the temperature judgment threshold according to the maximum temperature value, and determine the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold.

[0164] It can be understood that the reference temperature under the water tank hot water production priority instruction is greater than the reference temperature under the air conditioner cooling priority instruction.

[0165] It can be understood that the reference temperature under the air conditioner cooling priority instruction can be 28°C, can be 35°C, can be 37°C, or can be in the range of 28°C to 37°C. The embodiments of the present application do not make specific limitations on it.

[0166] It can be understood that the reference temperature under the water tank hot water production priority instruction can be 37°C, can be 42°C, can be 47°C, or can be in the range of 37°C to 47°C. The embodiments of the present application do not make specific limitations on it.

[0167] In addition, as Figure 12 shown, Figure 12 is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding the determination of the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold in the above step S1120, it may include but is not limited to step S1210 and step S1220.

[0168] Step S1210: When the refrigerant saturation temperature is less than the first temperature judgment threshold;

[0169] Step S1220: Use the difference between the refrigerant saturation temperature and the first temperature judgment threshold as the fan speed change value, where the first temperature judgment threshold is the sum value of the maximum temperature value and the fifth preset parameter.

[0170] It can be understood that when the refrigerant saturation temperature is less than the first temperature judgment threshold, it indicates that the exhaust pressure is too low at this time. Therefore, adjust the fan speed based on the fan speed change value to increase the exhaust pressure.

[0171] It can be understood that the above-mentioned fifth preset parameter can be 0°C, can be 5°C, can be 8°C, or can be in the range of 0°C to 8°C. The embodiments of the present application do not make specific limitations on it.

[0172] In addition, as Figure 13 shown, Figure 13It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding determining the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold in the above step S1120, it may include but is not limited to step S1310 and step S1320.

[0173] Step S1310: When the refrigerant saturation temperature is greater than the second temperature judgment threshold;

[0174] Step S1320: Use a constant multiple of the difference between the refrigerant saturation temperature and the second temperature judgment threshold as the fan speed change value, where the second temperature judgment threshold is the sum of the temperature maximum value and the sixth preset parameter.

[0175] It can be understood that when the refrigerant saturation temperature is greater than the second temperature judgment threshold, it indicates that the exhaust pressure is too high at this time. Therefore, the fan speed is adjusted based on the fan speed change value to reduce the exhaust pressure.

[0176] It can be understood that regarding the above constant multiple, it can be 2 times, and it can be set according to actual needs. The embodiments of the present application do not make specific limitations on it.

[0177] Exemplarily, the fan speed change value is 2 times the difference between the refrigerant saturation temperature and the second temperature judgment threshold.

[0178] It can be understood that the above sixth preset parameter can be 5°C, can be 10°C, can be 15°C, or can be between 5°C and 15°C. The embodiments of the present application do not make specific limitations on it.

[0179] In addition, as Figure 14 shown, Figure 14 It is a flowchart of a control method for a multi-connected air conditioner system provided by another embodiment of the present application; regarding determining the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold in the above step S1120, it may include but is not limited to step S1410 and step S1420.

[0180] Step S1410: When the refrigerant saturation temperature is greater than or equal to the first temperature judgment threshold and less than or equal to the second temperature judgment threshold;

[0181] Step S1420: Determine that the fan speed change value is zero.

[0182] It can be understood that when the refrigerant saturation temperature is less than or equal to the second temperature judgment threshold and greater than or equal to the first temperature judgment threshold, it indicates that the exhaust pressure is in a stable state at this time. Therefore, there is no need to adjust the speed of the outdoor unit fan.

[0183] In addition, as Figure 15 shown, Figure 15It is a flowchart of a control method for a multi-connected air-conditioning system provided by another embodiment of the present application; the control method of the multi-connected air-conditioning system further includes but is not limited to step S1510 and step S1520.

[0184] Step S1510: Determine the corresponding third temperature range according to the ambient temperature;

[0185] Step S1520: Determine the maximum rotational speed value and / or the minimum rotational speed value of the outdoor unit fan according to the third temperature range.

[0186] It can be understood that the maximum rotational speed value of the outdoor unit fan is as follows: If the ambient temperature > 45, the maximum rotational speed of the outdoor unit fan is fmax, the recommended value is 800 r / min, and the range is 720 - 960 r / min; if 38 < ambient temperature ≤ 45, the maximum rotational speed of the outdoor unit fan is fmax, the recommended value is 760 r / min, and the range is 650 - 800 r / min; if the ambient temperature ≤ 38 °C, the maximum rotational speed of the outdoor unit fan is fmax, the recommended value is 600 r / min, and the range is 480 - 650 r / min.

[0187] In one embodiment, the minimum rotational speed value of the outdoor unit fan is as follows: If the ambient temperature > 34, the minimum rotational speed of the outdoor unit fan is fmin, the recommended value is 500 r / min, and the range is 480 - 650 r / min; if 20 < ambient temperature ≤ 34, the minimum rotational speed of the outdoor unit fan is fmin, the recommended value is 300 r / min, and the range is 350 - 550 r / min; if 10 < ambient temperature ≤ 20, the minimum rotational speed of the outdoor unit fan is fmin, the recommended value is 200 r / min, and the range is 180 - 300 r / min; if the ambient temperature ≤ 10, the minimum rotational speed of the outdoor unit fan is fmin, the recommended value is 0 r / min, and the range is 0 - 160 r / min. The fan can be stopped if necessary;

[0188] In one embodiment, the above minimum rotational speed value can be 120 r / min, can be 150 r / min, can be 200 r / min, can be 250 r / min, or can be between 120 r / min and 250 r / min. The embodiments of the present application do not make specific limitations on it.

[0189] Based on the control methods of the multi-connected air-conditioning system in the above respective embodiments, overall embodiments of the control method of the multi-connected air-conditioning system of the present application are respectively proposed below.

[0190] As Figure 16 shown, Figure 16 It is a flowchart of a control method for a multi-connected air-conditioning system provided by an overall embodiment of the present application;

[0191] Under the corresponding priority control instruction, for different operating modes, adjust the control target of the outdoor unit fan, thereby changing the relevant effects; among them, different operating modes and the control target of the outdoor unit fan are as shown in Table 1 below:

[0192] Table 1

[0193]

[0194] 1.1 Judgment logic;

[0195] 1. After the air conditioner indoor unit starts cooling and the water tank indoor unit starts heating water, the corresponding air conditioner indoor unit detects the indoor temperature T1, the set temperature Ts, and the outdoor unit fan speed; the corresponding water tank indoor unit detects the water temperature Tw and the set water temperature Tws; the outdoor unit detects the ambient temperature T4;

[0196] 2. The corresponding water tank indoor unit sends a priority control instruction to the outdoor unit; determine the outdoor unit mode according to the cooling demand of the air conditioner indoor unit and the hot water heating demand of the water tank indoor unit, that is, determine the target cooling and hot water heating mode;

[0197] 3. The water tank indoor unit sends a limited control instruction, and the outdoor unit makes a judgment to determine the working logic of the outdoor fan.

[0198] 1.2 Priority of air conditioner cooling effect;

[0199] The water tank indoor unit sends an air conditioner cooling priority instruction;

[0200] a. When the outdoor unit mode is the first cooling and hot water heating mode, the outdoor unit fan enables "low pressure control":

[0201] When the outdoor unit fan starts, it enters the initial outdoor unit fan frequency according to the ambient temperature. After the initialization is completed, if the outdoor unit fan speed X≠0, the outdoor unit fan is adjusted every interval time t1, and the adjustment range is X∈[fmin, fmax]. Among them, the recommended value of the outdoor unit fan adjustment period t1 is 40s, and the range is 20~90s; the recommended value of the minimum speed fmin of the outdoor unit fan is 150r / min, and the range is 120~250r / min; the maximum speed fmax of the outdoor unit fan is limited according to the ambient temperature T4, which is described below;

[0202] The adjustment method of the outdoor unit fan according to the outdoor heat exchanger coil temperature T3 is as follows:

[0203] (1) When T3<min{T4-α, β}, the fan speed change value △X=min{T4-α, β}-T3;

[0204] (2) When T3>min{T4-γ, δ}, the fan speed change value △X=(min{T4-γ, δ}-T3)*2;

[0205] (3) When min{T4 - α, β} ≤ T3 ≤ min{T4 - γ, δ}, the change value of the fan speed △X = 0, that is, the current speed remains unchanged;

[0206] Among them, the recommended value of the first preset parameter α is 7°C, and the range is 4 - 8°C;

[0207] The recommended value of the second preset parameter β is 0°C, and the range is -5 - 5°C;

[0208] The recommended value of the third preset parameter γ is 2°C, and the range is 0 - 4°C;

[0209] The recommended value of the fourth preset parameter δ is 8°C, and the range is 5 - 10°C;

[0210] The maximum speed value of the outdoor unit fan is as follows:

[0211] If T4 > 45, the maximum speed of the outdoor unit fan fmax1, the recommended value is 800 r / min, and the range is 720 - 960 r / min;

[0212] If 38 < T4 ≤ 45, the maximum speed of the outdoor unit fan fmax2, the recommended value is 760 r / min, and the range is 650 - 800 r / min;

[0213] If T4 ≤ 38°C, the maximum speed of the outdoor unit fan fmax3, the recommended value is 600 r / min, and the range is 480 - 650 r / min;

[0214] b. The outdoor unit mode is the second refrigeration and hot water mode, and the external fan enables "IPM control - A":

[0215] The outdoor unit fan starts to enter the initial fan frequency according to the ambient temperature. After the initialization is completed, if the fan speed X ≠ 0, the outdoor unit fan is adjusted every interval time t1, and the adjustment range is X ∈ [fmin, fmax]. Among them, the recommended value of the adjustment period t1 of the outdoor unit fan is 40 s, and the range is 20 - 90 s; the minimum fan speed fmin, the recommended value is 150 r / min, and the range is 120 - 250 r / min; the maximum fan speed fmax is limited according to the T4 ambient temperature, which is described below;

[0216] The adjustment method of the outdoor unit fan is as follows: the speed of the outdoor unit fan = the current speed of the outdoor unit fan X + the change value of the fan speed △X

[0217] The change value of the fan speed △X is checked in Table 2 below:

[0218] Table 2

[0219] T-IPM △X Trg_T-IPM + a < T-IPM Directly increase to the maximum speed Trg_T-IPM + b < T-IPM ≤ Trg_T-IPM + a +20 Trg_T-IPM < T-IPM ≤ Trg_T-IPM + b 0 Trg_T-IPM + c < T-IPM ≤ Trg_T-IPM -20 T-IPM ≤ Trg_T-IPM + c -40

[0220] Among them, the recommended value of the first preset threshold a is 10, and the range is 10 - 15; the recommended value of the second preset threshold b is 5, and the range is 2 - 8; the recommended value of the third preset threshold c is -5, and the range is -2 - -8;

[0221] As Figure 17 shown, Figure 17 is a schematic diagram of the corresponding relationship between the ambient temperature and the detected temperature of the target power module provided by an embodiment of the present application;

[0222] The values of the detected temperature of the target power module are as shown in Table 3 below:

[0223] Table 3

[0224]

[0225]

[0226] The maximum rotational speed of the outdoor unit fan takes the following values:

[0227] If T4 > 45, then the maximum rotational speed of the outdoor unit fan fmax, the recommended value is 800 r / min, and the range is 720 - 960 r / min;

[0228] If 38 < T4 ≤ 45, then the maximum rotational speed of the outdoor unit fan fmax, the recommended value is 760 r / min, and the range is 650 - 800 r / min;

[0229] If T4 ≤ 38°C, then the maximum rotational speed of the outdoor unit fan fmax, the recommended value is 600 r / min, and the range is 480 - 650 r / min;

[0230] c. The outdoor unit mode is the third refrigeration and hot water mode, and the "high - pressure control - A" is enabled for the outdoor unit fan:

[0231] The outdoor unit fan starts to enter the initial fan frequency according to the ambient temperature. After the initialization is completed, if the fan rotational speed X ≠ 0, the outdoor unit fan is adjusted every interval time t1, and the adjustment range is X ∈ [fmin, fmax]. Among them, the recommended value of the adjustment period t1 of the outdoor unit fan is 40 s, and the range is 20 - 90 s; the recommended value of the minimum rotational speed fmin of the outdoor unit fan is 150 r / min, and the range is 120 - 250 r / min; the maximum rotational speed fmax of the outdoor unit fan is limited according to the T4 ambient temperature, which will be described below;

[0232] The fan adjustment method is as follows: the rotational speed of the outdoor unit fan = the current rotational speed X of the outdoor unit fan + the change value of the fan rotational speed △X;

[0233] (1) When the refrigerant saturation temperature Tc corresponding to the discharge pressure of the compressor < K1, △X = Tc - K1;

[0234] (2) When the refrigerant saturation temperature Tc > K2, ΔX = (Tc - K2) * 2;

[0235] (3) When K1 ≤ refrigerant saturation temperature Tc ≤ K2, ΔX = 0;

[0236] Among them,

[0237] a) K1 = Max{T4, T4_CoolW_Min} + CoolW_TEMP_A;

[0238] b) K2 = Max{T4, T4_CoolW_Min} + CoolW_TEMP_B;

[0239] The recommended value of the reference temperature T4_CoolW_Min is 35°C, and the range is 28 - 37°C; the parameter value of the fifth preset parameter CoolW_TEMP_A is recommended to be 5°C, and the range is 0 - 8°C; the parameter value of the sixth preset parameter CoolW_TEMP_B is recommended to be 10°C, and the range is 5 - 15°C;

[0240] The maximum speed of the outdoor unit fan is taken as follows:

[0241] If T4 > 45, then the maximum speed of the outdoor unit fan fmax, the recommended value is 800 r / min, and the range is 720 - 960 r / min;

[0242] If 38 < T4 ≤ 45, then the maximum speed of the outdoor unit fan fmax, the recommended value is 760 r / min, and the range is 650 - 800 r / min;

[0243] If T4 ≤ 38°C, then the maximum speed of the outdoor unit fan fmax, the recommended value is 600 r / min, and the range is 480 - 650 r / min;

[0244] In an embodiment, the minimum speed of the outdoor unit fan is taken as follows:

[0245] (1) If T4 > 34, then the minimum speed of the outdoor unit fan is fmin, the recommended value is 500 r / min, and the range is 480 - 650 r / min;

[0246] (2) If 20 < T4 ≤ 34, then the minimum speed of the outdoor unit fan is fmin, the recommended value is 300 r / min, and the range is 350 - 550 r / min;

[0247] (3) If 10 < T4 ≤ 20, then the minimum speed of the outdoor unit fan is fmin, the recommended value is 200 r / min, and the range is 180 - 300 r / min;

[0248] (4) If T4 ≤ 10, then the minimum speed of the outdoor unit fan is fmin, the recommended value is 0 r / min, and the range is 0 - 160 r / min. The fan can be stopped if necessary;

[0249] 1.3 The water tank effect is prioritized;

[0250] The water tank sends a water tank hot water production priority command;

[0251] a. The outdoor unit mode is the first cooling and hot water production mode, and the outdoor unit fan enables "low pressure control", which is the same as the air conditioner priority;

[0252] b. The outdoor unit mode is the second cooling and hot water production mode, and the outdoor unit fan enables "IPM control - B". On the basis of the air conditioner cooling priority, the target power module detects that the temperature is automatically corrected upwards by one gear. That is, for example, for the T4 temperature detection determination using Trg_T - IPM1, Trg_T - IPM2 is actually executed; for the determination of Trg_T - IPM4, Trg_T - IPM4 is still executed;

[0253] c. The outdoor unit mode is the third cooling and hot water production mode, and the outdoor unit fan enables "high pressure control - B". On the basis of the air conditioner cooling priority, the value of T4_CoolW_Min is increased. That is, the recommended value of T4_CoolW_Min is 42°C, and the range is 37 - 47°C;

[0254] It should be noted that the embodiments of the present application can achieve non - conflict between air - conditioning cooling and domestic hot water in the transitional season and winter, meeting the diverse needs of users; in addition, the embodiments of the present application can utilize the waste heat of air - conditioning cooling in various ways to produce domestic hot water, reduce electric auxiliary heating, and operate energy - efficiently.

[0255] Based on the control methods of the multi - split air - conditioning system in the above - mentioned various embodiments, the embodiments of the controller, multi - split air - conditioning system, computer - readable storage medium, and computer program product of the present application are respectively proposed below.

[0256] As Figure 18 shown, Figure 18 is a schematic diagram of a controller for executing the control method of a multi - split air - conditioning system provided by an embodiment of the present application. The controller 700 implemented in the present application includes: a processor 710, a memory 720, and a computer program stored on the memory 720 and executable on the processor 710. Among them, Figure 18 One processor 710 and one memory 720 are taken as an example.

[0257] The processor 710 and the memory 720 can be connected through a bus or other means, Figure 18 Taking the connection through a bus as an example. [[ID=3,6]]

[0258] The memory 720, being 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 720 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 720 may optionally include a memory 720 that is remotely located relative to the processor 710, and these remote memories 720 can be connected to the controller 700 through 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.

[0259] Those skilled in the art can understand that Figure 18 the device structure shown in does not constitute a limitation on the controller 700, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0260] In Figure 18 the controller 700 shown, the processor 710 can be used to call the control program stored in the memory 720, so as to implement the control method of the above-mentioned multi-connected air-conditioning system. Specifically, the non-transitory software programs and instructions required to implement the control method of the multi-connected air-conditioning system in the above embodiments are stored in the memory 720, and when executed by the processor 710, the control method of the multi-connected air-conditioning system in the above embodiments is executed.

[0261] It should be noted that since the controller 700 in the embodiments of the present application can execute the control method of the multi-connected air-conditioning system in any of the above embodiments, therefore, the specific implementation manners and technical effects of the controller 700 in the embodiments of the present application can refer to the specific implementation manners and technical effects of the control method of the multi-connected air-conditioning system in any of the above embodiments.

[0262] In addition, an embodiment of the present application further provides a multi-connected air-conditioning system, and this multi-connected air-conditioning system includes the controller in the above embodiment.

[0263] It should be noted that since the multi-connected air-conditioning system in the embodiments of the present application includes the controller in the above embodiment, and the controller in the above embodiment can execute the control method of the multi-connected air-conditioning system in any of the above embodiments, therefore, the specific implementation manners and technical effects of the multi-connected air-conditioning system in the embodiments of the present application can refer to the specific implementation manners and technical effects of the control method of the multi-connected air-conditioning system in any of the above embodiments.

[0264] In addition, an embodiment of the present application further provides a computer-readable storage medium, and this computer-readable storage medium stores computer-executable instructions for executing the control method of the above-mentioned multi-connected air-conditioning system. Exemplarily, execute the method steps in Figures 2 to 16 above description.

[0265] It should be noted that since the computer-readable storage medium of the embodiments of the present application can execute the control method of the multi-connected air conditioner system in any of the above embodiments, therefore, the specific implementation manners and technical effects of the computer-readable storage medium of the embodiments of the present application can refer to the specific implementation manners and technical effects of the control method of the multi-connected air conditioner system in any of the above embodiments.

[0266] In addition, an embodiment of the present application further provides a computer program product, including a computer program or computer instructions. The computer program or computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes the control method of the multi-connected air conditioner system described above. Exemplarily, the method steps described above are executed. Figures 2 to 16 in.

[0267] It should be noted that since the computer program product of the embodiments of the present application can execute the control method of the multi-connected air conditioner system in any of the above embodiments, therefore, the specific implementation manners and technical effects of the computer program product of the embodiments of the present application can refer to the specific implementation manners and technical effects of the control method of the multi-connected air conditioner system in any of the above embodiments.

[0268] Those of ordinary skill in the art can understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill 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 includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0269] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item) of the following" or its similar expressions refer to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) 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, and c can be single or multiple.

[0270] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, 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 displayed or discussed coupling, direct coupling, or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0271] It should also be understood that the various embodiments provided in the embodiments of this application can be combined arbitrarily to achieve different technical effects.

[0272] The above is a specific description of the preferred embodiments of this application, but this application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without violating the spirit of this application. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A control method for a multi-connected air-conditioning system, characterized in that, The multi-connected air-conditioning system includes an outdoor unit, an indoor air-conditioning unit, and an indoor water tank unit. The outdoor unit includes a compressor, an outdoor heat exchanger, and a valve assembly. The valve assembly includes a first reversing valve, a second reversing valve, and a third reversing valve. The first reversing valve is connected to the indoor air-conditioning unit and the suction port of the compressor. The second reversing valve is connected to the discharge port of the compressor and the indoor water tank unit. The third reversing valve is connected to the discharge port, the suction port of the compressor, and the outdoor heat exchanger. The outdoor heat exchanger is also connected to the indoor air-conditioning unit and the indoor water tank unit respectively through a main expansion valve. The method includes: Obtain the target refrigeration and hot water supply mode and the priority control instruction of the multi-connected air-conditioning system. Among them, the priority control instruction includes an air-conditioning refrigeration priority instruction or a hot water supply priority instruction for the water tank. Control the rotation speed of the outdoor unit fan according to the target refrigeration and hot water supply mode and the priority control instruction.

2. The method according to claim 1, wherein The target refrigeration and hot water supply mode includes one of the following: The first refrigeration and hot water supply mode. In the first refrigeration and hot water supply mode, the first reversing valve connects the indoor air-conditioning unit and the suction port of the compressor. The second reversing valve connects the discharge port of the compressor and the indoor water tank unit. The third reversing valve connects the outdoor heat exchanger and the suction port of the compressor. The main expansion valve is in a conducting state. The second refrigeration and hot water supply mode. In the second refrigeration and hot water supply mode, the first reversing valve connects the indoor air-conditioning unit and the suction port of the compressor. The second reversing valve connects the discharge port of the compressor and the indoor water tank unit. The third reversing valve connects the outdoor heat exchanger and the suction port of the compressor. The main expansion valve is in a cut-off state. The third refrigeration and hot water supply mode. In the third refrigeration and hot water supply mode, the first reversing valve connects the indoor air-conditioning unit and the suction port of the compressor. The second reversing valve connects the discharge port of the compressor and the indoor water tank unit. The third reversing valve connects the discharge port of the compressor and the outdoor heat exchanger. The main expansion valve is in a conducting state.

3. The method according to claim 2, wherein The controlling the rotation speed of the outdoor unit fan according to the target refrigeration and hot water supply mode and the priority control instruction includes: In the case of the first refrigeration and hot water supply mode, when the priority control instruction is an air-conditioning refrigeration priority instruction or a hot water supply priority instruction for the water tank, obtain the ambient temperature and the temperature of the outdoor heat exchanger coil of the outdoor unit. Determine the fan speed change value according to the ambient temperature and the temperature of the outdoor heat exchanger coil. Adjust the rotation speed of the outdoor unit fan based on the fan speed change value between the minimum rotation speed value and the maximum rotation speed value.

4. The method according to claim 3, characterized in that, The determining the fan speed change value according to the ambient temperature and the temperature of the outdoor heat exchanger coil includes one of the following: Determine the first difference between the ambient temperature and the first preset parameter. When the temperature of the outdoor heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, use the difference between the minimum value of the first difference and the second preset parameter and the temperature of the outdoor heat exchanger coil as the fan speed change value. Determine the second difference between the ambient temperature and the third preset parameter. When the temperature of the outdoor unit heat exchanger coil is greater than the minimum value of the second difference and the fourth preset parameter, use a constant multiple of the difference between the minimum value of the second difference and the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil as the fan speed change value; When the temperature of the outdoor unit heat exchanger coil is greater than or equal to the minimum value of the first difference and the second preset parameter and less than or equal to the minimum value of the second difference and the fourth preset parameter, determine that the fan speed change value is zero.

5. The method according to claim 2, wherein The control of the speed of the outdoor fan according to the target refrigeration and hot water mode and the priority control instruction includes: In the case of the second refrigeration and hot water mode, when the priority control instruction is the air-conditioning refrigeration priority instruction or the water tank hot water priority instruction, obtain the ambient temperature and the current power module detection temperature of the electronic control PCB board; Determine the target power module detection temperature of the electronic control PCB board according to the ambient temperature; Determine the fan speed change value according to the current power module detection temperature and the target power module detection temperature; Between the minimum speed value and the maximum speed value, adjust the speed of the outdoor fan based on the fan speed change value.

6. The method according to claim 5, wherein The determination of the target power module detection temperature of the electronic control PCB board according to the ambient temperature includes: Determine the corresponding first temperature range according to the ambient temperature; Determine the target power module detection temperature of the electronic control PCB board according to the first temperature range; Among them, the target power module detection temperature corresponding to the first temperature range at the current gear under the air-conditioning refrigeration priority instruction is equal to the target power module detection temperature corresponding to the first temperature range at the lower gear under the water tank hot water priority instruction.

7. The method according to claim 5, wherein The determination of the fan speed change value according to the current power module detection temperature and the target power module detection temperature includes: Determine multiple second temperature ranges according to the target power module detection temperature; Determine the fan speed change value according to the second temperature range where the current power module detection temperature is located.

8. The method according to claim 2, wherein The control of the speed of the outdoor fan according to the target refrigeration and hot water mode and the priority control instruction includes: In the case of the third refrigeration and hot water mode, when the priority control instruction is the air-conditioning refrigeration priority instruction or the water tank hot water priority instruction, obtain the ambient temperature and the refrigerant saturation temperature corresponding to the discharge pressure of the compressor; Determine the fan speed change value according to the ambient temperature and the refrigerant saturation temperature; Between the minimum speed value and the maximum speed value, adjust the speed of the outdoor fan based on the fan speed change value.

9. The method according to claim 8, wherein The determination of the fan speed change value according to the ambient temperature and the refrigerant saturation temperature includes: Determine the reference temperature, and select the maximum temperature value from the ambient temperature and the reference temperature; Determine the temperature judgment threshold according to the maximum temperature value, and determine the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold; Among them, the reference temperature under the air conditioner cooling priority instruction is less than the reference temperature under the water tank hot water production priority instruction.

10. The method according to claim 9, wherein Determining the fan speed change value according to the refrigerant saturation temperature and the temperature judgment threshold includes one of the following: When the refrigerant saturation temperature is less than the first temperature judgment threshold, the difference between the refrigerant saturation temperature and the first temperature judgment threshold is used as the fan speed change value, where the first temperature judgment threshold is the sum of the maximum temperature and the fifth preset parameter; When the refrigerant saturation temperature is greater than the second temperature judgment threshold, a constant multiple of the difference between the refrigerant saturation temperature and the second temperature judgment threshold is used as the fan speed change value, where the second temperature judgment threshold is the sum of the maximum temperature and the sixth preset parameter; When the refrigerant saturation temperature is greater than or equal to the first temperature judgment threshold and less than or equal to the second temperature judgment threshold, the fan speed change value is determined to be zero.

11. The method according to claim 3, 5 or 8, characterized in that, The method further includes: Determining a corresponding third temperature range according to the ambient temperature; Determining the maximum speed value and / or the minimum speed value of the outdoor unit fan according to the third temperature range.

12. A controller, characterized in that, Including: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor runs the computer program, it executes the control method of the multi-connected air conditioner system according to any one of claims 1 to 11.

13. A multi-connected air conditioner system, characterized in that, Including the controller according to claim 12.

14. A computer-readable storage medium, characterized in that: Stored with computer-executable instructions for executing the control method of the multi-connected air conditioner system according to any one of claims 1 to 11.

15. 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, the processor of the 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 control method of the multi-connected air conditioner system according to any one of claims 1 to 11.

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