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

Abstract

This application proposes a multi-split air conditioning system and its control method, controller, medium, and product. The multi-split system includes an outdoor unit, an indoor air conditioning 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 method includes: acquiring the target cooling / hot water mode and priority control command of the multi-split system, wherein the priority control command includes an air conditioning cooling priority command or a water tank hot water priority command; and controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command. Because this application embodiment can control the speed of the outdoor unit fan through the target cooling / hot water mode and the priority control command, it can achieve the regulation of exhaust pressure, thereby realizing the coordinated operation of air conditioning cooling and domestic hot water supply, avoiding conflicts between air conditioning cooling and domestic hot water supply, and meeting the diverse needs of users.

Description

Technical Field

[0001] This application relates to the field of multi-split air conditioning system technology, and in particular to a multi-split air conditioning system and its control method, controller, medium and product. Background Technology

[0002] In related technologies, multi-split air conditioning systems are increasingly widely used, with more and more diverse terminal configurations to fully adapt to various user scenarios. For example, this system can be used with indoor air conditioning units or connected to a water tank. This heat pump system has powerful multi-functional service capabilities, meeting the air conditioning needs of different rooms while also providing domestic hot water service. Specifically, the system consists of one outdoor unit connected to multiple indoor air conditioning units and an outdoor water tank. In actual operation, the indoor air conditioning units provide comfortable air conditioning services, while the water tank supplies hot water.

[0003] However, when a heat pump system performs both cooling and hot water production tasks simultaneously, if hot water production is prioritized, the exhaust pressure will increase accordingly, which will weaken the cooling effect and significantly increase the system's power consumption, resulting in energy waste. Conversely, if cooling is prioritized, the exhaust pressure needs to be controlled at a lower level, and the hot water production rate will decrease accordingly. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a multi-split air conditioning system and its control method, controller, medium, and product, designed to achieve coordinated operation of air conditioning cooling and domestic hot water supply without conflict, thus meeting diverse user needs.

[0005] In a first aspect, embodiments of this application provide a control method for a multi-split air conditioning system. The multi-split system includes an outdoor unit, an indoor air conditioning 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 indoor air conditioning unit and the compressor's suction port. The second reversing valve is connected to the compressor's discharge port and the water tank indoor unit. The third reversing valve is connected to the compressor's discharge port, suction port, and the outdoor heat exchanger. The outdoor heat exchanger is also connected to the indoor air conditioning unit and the water tank indoor unit via a main expansion valve. The method includes:

[0006] Obtain the target cooling / hot water production mode and priority control command of the multi-split system, wherein the priority control command includes an air conditioning cooling priority command or a water tank hot water production priority command;

[0007] The speed of the outdoor unit fan is controlled according to the target cooling and hot water production mode and the priority control command.

[0008] According to some embodiments of this application, the target cooling-to-hot-water mode includes one of the following:

[0009] In the first cooling and hot water mode, the first reversing valve connects the indoor unit of the air conditioner and the suction port of the compressor, the second reversing valve connects the exhaust port of the compressor and the indoor unit of the water tank, 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] In the second cooling and hot water mode, the first reversing valve connects the indoor unit of the air conditioner and the suction port of the compressor, the second reversing valve connects the exhaust port of the compressor and the indoor unit of the water tank, 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] In the third cooling and hot water mode, the first reversing valve connects the indoor unit of the air conditioner and the suction port of the compressor, the second reversing valve connects the discharge port of the compressor and the indoor unit of the water tank, 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 this application, controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command includes:

[0013] In the first cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the ambient temperature and the outdoor unit heat exchanger coil temperature of the outdoor heat exchanger are obtained.

[0014] The fan speed change value is determined based on the ambient temperature and the outdoor unit heat exchanger coil temperature.

[0015] The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

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

[0017] A first difference between the ambient temperature and a first preset parameter is determined. When the temperature of the outdoor unit heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, the difference between the first difference and the minimum value of the second preset parameter and the temperature of the outdoor unit heat exchanger coil is taken as the fan speed change value.

[0018] 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, take the constant multiple of the difference between the second difference and the minimum value of 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, the change in fan speed is determined to be zero.

[0020] According to some embodiments of this application, controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command includes:

[0021] In the second cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the ambient temperature and the current power module detection temperature of the electronic control PCB board are obtained;

[0022] The target power module detection temperature of the electronic control PCB board is determined based on the ambient temperature.

[0023] The fan speed change is determined based on the current power module's detected temperature and the target power module's detected temperature.

[0024] The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

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

[0026] The corresponding first temperature range is determined based on the ambient temperature.

[0027] The target power module detection temperature of the electronic control PCB board is determined based on the first temperature range.

[0028] The target power module detection temperature corresponding to the first temperature range of the current setting under the air conditioning cooling priority command is equal to the target power module detection temperature corresponding to the first temperature range of the next lower setting under the water tank hot water priority command.

[0029] According to some embodiments of this application, determining the fan speed change value based on the current power module detected temperature and the target power module detected temperature includes:

[0030] Multiple second temperature ranges are determined based on the temperature detected by the target power module;

[0031] The change in fan speed is determined based on the second temperature range in which the current power module detects the temperature.

[0032] According to some embodiments of this application, controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command includes:

[0033] In the third cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the refrigerant saturation temperature corresponding to the ambient temperature and the compressor discharge pressure is obtained;

[0034] The fan speed change value is determined based on the ambient temperature and the refrigerant saturation temperature.

[0035] The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

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

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

[0038] The temperature judgment threshold is determined based on the maximum temperature value, and the fan speed change value is determined based on the refrigerant saturation temperature and the temperature judgment threshold.

[0039] Wherein, the reference temperature under the air conditioning cooling priority command is lower than the reference temperature under the water tank hot water production priority command.

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

[0041] 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, wherein the first temperature judgment threshold is the sum of the maximum temperature and the fifth preset parameter;

[0042] When the refrigerant saturation temperature is greater than the second temperature judgment threshold, the constant multiple of the difference between the refrigerant saturation temperature and the second temperature judgment threshold is taken as the fan speed change value, wherein the second temperature judgment threshold is the sum 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, the change in fan speed is determined to be zero.

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

[0045] The corresponding third temperature range is determined based on the ambient temperature.

[0046] The maximum speed value and / or the minimum speed value of the outdoor unit fan are determined based on the third temperature range.

[0047] Secondly, embodiments of this application provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for the multi-unit system described in the first aspect when running the computer program.

[0048] Thirdly, embodiments of this application provide a multi-unit system, including the controller described in the second aspect above.

[0049] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for performing the control method of the multi-unit system as described in the first aspect above.

[0050] Fifthly, embodiments of this application provide a computer program product, including a computer program or computer instructions, wherein 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, causing the computer device to perform the control method of the multi-unit system as described in the first aspect above.

[0051] According to the technical solution of the embodiments of this application, at least the following beneficial effects are achieved: The embodiments of this application propose a multi-split air conditioning system and its control method, controller, medium, and product, which are applied in the field of multi-split air conditioning system technology. The multi-split air conditioning system includes an outdoor unit, an indoor air conditioning 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 compressor's suction port. The second reversing valve is connected to the compressor's discharge port and the water tank indoor unit. The third reversing valve is connected to the compressor's discharge port, the suction port, and the outdoor heat exchanger. The outdoor heat exchanger is also connected to the air conditioning indoor unit and the water tank indoor unit through a main expansion valve. The method includes: obtaining the target cooling and hot water production mode and priority control command of the multi-split air conditioning system, wherein the priority control command includes an air conditioning cooling priority command or a water tank hot water production priority command; and controlling the speed of the outdoor unit fan according to the target cooling and hot water production mode and the priority control command. Because the embodiments of this application can control the speed of the outdoor unit fan through the target cooling and hot water production mode and priority control command, the exhaust pressure can be adjusted, thereby realizing the coordinated operation of air conditioning cooling and domestic hot water supply, avoiding the occurrence of conflict between air conditioning cooling and domestic hot water supply, and meeting the diverse needs of users.

[0052] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0053] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0054] Figure 1 This is a schematic diagram of the structure of a multi-unit air conditioning system provided in one embodiment of this application;

[0055] Figure 2 This is a flowchart of a control method for a multi-unit air conditioning system provided in one embodiment of this application;

[0056] Figure 3 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0057] Figure 4 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0058] Figure 5 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0059] Figure 6This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0060] Figure 7 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0061] Figure 8 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0062] Figure 9 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0063] Figure 10 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0064] Figure 11 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0065] Figure 12 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0066] Figure 13 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0067] Figure 14 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0068] Figure 15 This is a flowchart of a control method for a multi-unit air conditioning system provided in another embodiment of this application;

[0069] Figure 16 This is a flowchart of a control method for a multi-unit air conditioning system provided in an overall embodiment of this application;

[0070] Figure 17 This is a schematic diagram illustrating the correspondence between ambient temperature and the target power module detection temperature according to an embodiment of this application;

[0071] Figure 18 This is a schematic diagram of a controller for performing a control method for a multi-unit system, provided in one embodiment of this application. Detailed Implementation

[0072] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0073] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0074] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0075] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0076] In some situations, multi-split air conditioning systems are becoming increasingly widespread, with more and more diverse terminal configurations to fully adapt to various user scenarios. For example, this system can be used with indoor air conditioning units or connected to a water tank. This heat pump system has powerful multi-functional service capabilities, meeting the air conditioning needs of different rooms while also providing domestic hot water service. Specifically, the system consists of one outdoor unit connected to multiple indoor air conditioning units and an outdoor water tank. In actual operation, the indoor air conditioning units are responsible for providing comfortable air conditioning, while the water tank is responsible for supplying hot water.

[0077] However, when a heat pump system performs both cooling and hot water production tasks simultaneously, if hot water production is prioritized, the exhaust pressure will increase accordingly, which will weaken the cooling effect and significantly increase the system's power consumption, resulting in energy waste. Conversely, if cooling is prioritized, the exhaust pressure needs to be controlled at a lower level, and the hot water production rate will decrease accordingly.

[0078] Based on the above, this application proposes a multi-split air conditioning system and its control method, controller, medium, and product, aiming to achieve coordinated operation of air conditioning cooling and domestic hot water supply without conflict, thus meeting the diverse needs of users.

[0079] The various embodiments of the multi-unit system of this application will be further described below with reference to the accompanying drawings.

[0080] like Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a multi-unit system provided in one embodiment of this application.

[0081] In one embodiment, the multi-split air conditioning system includes an indoor unit and an outdoor unit, wherein the indoor unit includes... Figure 1 The air conditioner indoor unit 100 and water tank indoor unit 300 shown in the diagram include outdoor equipment. Figure 1 The outdoor unit shown is connected to the indoor air conditioner unit 100 and the water tank indoor unit 300 via refrigerant pipes. The outdoor unit is equipped with an outdoor heat exchanger 200, a compressor 400 and a valve assembly. The compressor 400 is connected to the outdoor heat exchanger 200, the indoor air conditioner unit 100 and the water tank indoor unit 300 via the valve assembly.

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

[0083] It is understood that the first reversing valve 510, the second reversing valve 520 and the third reversing valve 530 mentioned above can be three-way valves or four-way valves, and the embodiments of this application do not specifically limit them.

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

[0085] In one embodiment, such as Figure 1 As shown, the valve assembly also includes, but is not limited to, multiple 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 indoor air conditioning unit 100 via the sub-expansion valves 620, and also connected to the water tank indoor unit 300 via the sub-expansion valves 620.

[0086] like Figure 1As shown, in the case of refrigeration and without the need for heat recovery, the refrigerant is compressed by the compressor 400 and then 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 indoor unit 100 are in the open state. Therefore, the condensed refrigerant enters each indoor unit 100 through the main expansion valve 610 and the sub-expansion valve 620 for evaporation. Finally, the evaporated refrigerant re-enters the compressor 400 through the first reversing valve 510, forming a cycle.

[0087] It should be noted that the refrigerant flow direction in the case of heating and without heat recovery is the opposite of the refrigerant flow direction in the case of cooling and without heat recovery, and this application embodiment will not elaborate on this.

[0088] In addition, the target cooling and hot water production mode for multi-split systems may include, but is not limited to, the following three target cooling and hot water production modes, as detailed below:

[0089] First cooling and hot water mode: In this mode, the outdoor heat exchanger 200 acts 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 compressor 400 discharge port 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, and the main expansion valve 610 is in the conducting state.

[0090] Specifically, when the multi-split system is in the first cooling / hot water mode, the refrigerant, after being compressed by the compressor 400, enters the indoor unit 300 in the water tank through the second reversing valve 520 for heat exchange and condensation, thereby heating the water in the indoor unit 300. At this time, the main expansion valve 610 and the branch expansion valve 620 are open, so the condensed refrigerant is divided into two parts. One part of the refrigerant enters each indoor unit 100 through the branch expansion valve 620 for evaporation. Finally, the evaporated refrigerant re-enters the compressor 400 through the first reversing valve 510, forming a cycle. Simultaneously, the other part of the refrigerant enters the outdoor heat exchanger 200 through the main expansion valve 610 for evaporation. Finally, the evaporated refrigerant re-enters the compressor 400 through the third reversing valve 530, forming a cycle.

[0091] Second cooling and hot water 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 exhaust 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, and the main expansion valve 610 is in the cut-off state.

[0092] Specifically, when the multi-split system is in the second cooling / hot water mode and the main expansion valve 610 is closed, the refrigerant, after being compressed by the compressor 400, enters the indoor unit 300 in the water tank through the second reversing valve 520 for heat exchange and condensation. This heats the water in the indoor unit 300. At this time, the sub-expansion valve 620 is open, while the main expansion valve 610 is closed. Therefore, after condensation, all the refrigerant passes through the sub-expansion valve 620 into each indoor unit 100 for evaporation. Finally, the evaporated refrigerant re-enters the compressor 400 through the first reversing valve 510, forming a cycle. Because the main expansion valve 610 is closed, the condensed refrigerant does not enter the outdoor heat exchanger 200 through the main expansion valve 610.

[0093] Third cooling and hot water mode: In this mode, the outdoor heat exchanger 200 acts as a condenser. 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 exhaust port of the compressor 400 and the water tank indoor unit 300. The third reversing valve 530 connects the exhaust 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-split system is in the third cooling / hot water mode, the refrigerant, after being compressed by the compressor 400, 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 open, so the condensed refrigerant enters each indoor unit 100 through the main expansion valve 610 and the sub-expansion valve 620 corresponding to the indoor unit 100 for evaporation. The other part of the refrigerant enters the water tank indoor unit 300 through the second reversing valve 520 for heat exchange and condensation, thereby heating and storing the water in the water tank indoor unit 300. At this time, the sub-expansion valve 620 is open, so the condensed refrigerant enters each indoor unit 100 through the sub-expansion valve 620 for evaporation. Finally, all the refrigerant that has been evaporated in the indoor unit 100 will re-enter the compressor 400 through the first reversing valve 510, forming a cycle.

[0095] Based on the hardware structure of the multi-unit air conditioning system in the above embodiments, the following presents various embodiments of the control method of the multi-unit air conditioning system of this application.

[0096] like Figure 2 As shown, Figure 2 This is a flowchart of a control method for a multi-split air conditioning system provided in one embodiment of this application; the control method for the multi-split air conditioning system may include, but is not limited to, steps S210 and S220.

[0097] Step S210: Obtain the target cooling and hot water production mode and priority control command of the multi-split system, wherein the priority control command includes air conditioning cooling priority command or water tank hot water production priority command;

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

[0099] In one embodiment, the present application embodiment can control the speed of the outdoor unit fan through the target cooling and hot water mode and priority control command, thereby achieving the regulation of exhaust pressure, and thus realizing the coordinated operation of air conditioning cooling and domestic hot water supply, avoiding the occurrence of conflict between air conditioning cooling and domestic hot water supply, and meeting the diverse needs of users.

[0100] It is understandable that the target cooling and hot water production modes include: the first cooling and hot water production mode, the second cooling and hot water production mode, and the third cooling and hot water production mode.

[0101] In addition, such as Figure 3 As shown, Figure 3 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S220, it may include, but is not limited to, steps S310, S320 and S330.

[0102] Step S310: In the first cooling and hot water mode, when the priority control command is the air conditioning cooling priority command or the water tank hot water priority command, obtain the ambient temperature and the outdoor unit heat exchanger coil temperature.

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

[0104] Step S330: 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.

[0105] Understandably, when the target cooling / hot water mode is the first cooling / hot water mode, and the priority control command is the air conditioning cooling priority command or the water tank hot water priority command, the fan speed change value is obtained by acquiring the ambient temperature and the outdoor unit heat exchanger coil temperature. Thus, within the fan speed adjustment range, that is, between the minimum speed value and the maximum speed value, the fan speed of the outdoor unit is adjusted according to the fan speed change value and the preset time interval, thereby achieving the adjustment of the exhaust pressure.

[0106] It is understood that the time interval mentioned above can be 20s, 40s, 60s, 90s, or between 20s and 90s, and this application does not specifically limit it.

[0107] It is understandable 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 in the fan speed.

[0108] In addition, such as Figure 4 As shown, Figure 4 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S320, it may include, but is not limited to, steps S410 and 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 unit heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, the difference between the first difference, the minimum value of the second preset parameter and the temperature of the outdoor unit heat exchanger coil is used as the fan speed change value.

[0111] It is understandable that if the temperature of the outdoor unit heat exchanger coil is less than the minimum of the first difference and the second preset parameter, it means that the heat exchange effect of the outdoor unit heat exchanger is excessive. If the current outdoor unit fan speed is maintained, the system energy consumption will increase. Therefore, the outdoor unit fan speed is adjusted based on the fan speed change value to reduce the system energy consumption.

[0112] For example, when the first difference is greater than the second preset parameter, and the temperature of the outdoor unit heat exchanger coil is less than the second preset parameter, the difference between the second preset parameter and the temperature of the outdoor unit heat exchanger coil is calculated, and the difference is used as the change value of the fan speed.

[0113] It is understood that the first preset parameter mentioned above can be 4°C, 7°C, 8°C, or between 4°C and 8°C. This application embodiment does not specifically limit it.

[0114] It is understood that the second preset parameter mentioned above can be -5℃, 0℃, 5℃, or between -5℃ and 5℃. This application embodiment does not specifically limit it.

[0115] In addition, such as Figure 5 As shown, Figure 5 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S320, it may include, but is not limited to, steps S510 and 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, the 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 is taken as the fan speed change value.

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

[0119] For example, 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, the difference between the fourth preset parameter and the temperature of the outdoor unit heat exchanger coil is calculated, and a constant multiple of the difference is used as the fan speed change value.

[0120] It is understood that the third preset parameter mentioned above can be 0°C, 2°C, 4°C, or between 0°C and 4°C. This application embodiment does not specifically limit it.

[0121] It is understood that the fourth preset parameter mentioned above can be 5℃, 8℃, 10℃, or between 5℃ and 10℃. This application embodiment does not specifically limit it.

[0122] It is understood that the constant multiple mentioned above can be 2 times, and can be set according to actual needs. This application does not impose specific limitations on it.

[0123] In addition, such as Figure 6 As shown, Figure 6 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S320, it may include, but is not limited to, steps S610 and 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 change in fan speed is zero.

[0126] It is understandable that if the temperature of the outdoor unit heat exchanger coil is greater than or equal to the minimum of the first difference and the second preset parameter, and less than or equal to the minimum 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. Therefore, there is no need to adjust the speed of the outdoor unit fan.

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

[0128] In addition, such as Figure 7 As shown, Figure 7 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S220, it may include, but is not limited to, steps S710, S720, S730 and S740.

[0129] Step S710: In the second cooling and hot water mode, when the priority control command is the air conditioning cooling priority command or the water tank hot water priority command, 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 based on the ambient temperature;

[0131] Step S730: Determine the fan speed change value based on the current power module detection temperature and the target power module detection temperature;

[0132] Step S740: 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.

[0133] Understandably, when the target cooling / hot water mode is the second cooling / hot water mode, and the priority control command is the air conditioning cooling priority command / water tank hot water priority command, the target power module detection temperature can be obtained by acquiring the ambient temperature. Then, based on the current power module detection temperature and the target power module detection temperature, the fan speed change value is obtained. Thus, within the fan speed adjustment range, that is, between the minimum speed value and the maximum speed value, the fan speed of the external unit is adjusted according to the fan speed change value and the preset time interval, thereby achieving the adjustment of the exhaust pressure.

[0134] It is understood that the time interval mentioned above can be 20s, 40s, 60s, 90s, or between 20s and 90s, and this application does not specifically limit it.

[0135] It is understandable 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 in the fan speed.

[0136] In addition, such as Figure 8 As shown, Figure 8This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S720, it may include, but is not limited to, steps S810 and S820.

[0137] Step S810: Determine the corresponding first temperature range based on the ambient temperature;

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

[0139] It is understandable that each first temperature range has a corresponding target power module detection temperature on the electronic control PCB board, thus the target power module detection temperature can be determined through the first temperature range.

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

[0141] It is understood that the detection temperature of the first target power module mentioned above can be 28°C, 35°C, 40°C, or between 28°C and 40°C. This application embodiment does not specifically limit it.

[0142] It is understood that the detection temperature of the second target power module mentioned above can be 35°C, 48°C, 55°C, or between 35°C and 55°C. This application embodiment does not specifically limit it.

[0143] It is understood that the detection temperature of the third target power module mentioned above can be 45°C, 60°C, 70°C, or between 45°C and 70°C. This application embodiment does not specifically limit it.

[0144] It is understood that the detection temperature of the fourth target power module mentioned above can be 60°C, 70°C, 80°C, or between 60°C and 80°C. This application embodiment does not specifically limit it.

[0145] It is understandable that the target power module detection temperature corresponding to the first temperature range of the current setting under the hot water priority command of the water tank is equal to the target power module detection temperature corresponding to the first temperature range of the next higher setting under the cooling water priority command of the water tank.

[0146] For example, if the target power module detection temperature corresponding to the first temperature range of the current setting under the water tank cooling water priority command is the first target power module detection temperature, then the target power module detection temperature under the water tank hot water priority command is the second target power module detection temperature; if the target power module detection temperature corresponding to the first temperature range of the current setting under the water tank cooling water priority command is the second target power module detection temperature, then the target power module detection temperature under the water tank hot water priority command is the third target power module detection temperature; if the target power module detection temperature corresponding to the first temperature range of the current setting under the water tank cooling water priority command is the third target power module detection temperature, then the target power module detection temperature under the water tank hot water priority command is the fourth target power module detection temperature.

[0147] In addition, such as Figure 9 As shown, Figure 9 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S730, it may include, but is not limited to, steps S910 and S920.

[0148] Step S910: Determine multiple second temperature ranges based on the target power module's detected temperature;

[0149] Step S920: Determine the fan speed change value based on the second temperature range where the current power module detects the temperature.

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

[0151] It is understood that the first preset threshold mentioned above can be 10, 12, 15, or between 10 and 15, and this application embodiment does not specifically limit it.

[0152] It is understood that the second preset threshold mentioned above can be 2, 5, 8, or between 2 and 8, and this application embodiment does not specifically limit it.

[0153] It is understood that the aforementioned third preset threshold can be -2, -5, -8, or between -2 and -8, and this application embodiment does not specifically limit it.

[0154] In addition, such as Figure 10 As shown, Figure 10 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S220, it may include, but is not limited to, steps S1010, S1020 and S1030.

[0155] Step S1010: In the third cooling and hot water mode, when the priority control command is the air conditioning cooling priority command or the water tank hot water priority command, obtain the refrigerant saturation temperature corresponding to the ambient temperature and the compressor discharge pressure.

[0156] Step S1020: Determine the fan speed change value based on the ambient temperature and 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] Understandably, when the target cooling and hot water mode is the third cooling and hot water mode, and the priority control command is the air conditioning cooling priority command / water tank hot water priority command, the fan speed change value can be obtained by acquiring the ambient temperature and the refrigerant saturation temperature corresponding to the compressor's discharge pressure. Thus, within the fan speed adjustment range, that is, between the minimum speed value and the maximum speed value, the fan speed of the external unit is adjusted according to the fan speed change value and the preset time interval, thereby achieving the adjustment of the discharge pressure.

[0159] It is understood that the time interval mentioned above can be 20s, 40s, 60s, 90s, or between 20s and 90s, and this application does not specifically limit it.

[0160] It is understandable 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 in the fan speed.

[0161] In addition, such as Figure 11 As shown, Figure 11 This is a flowchart of a control method for a multi-unit system provided in another embodiment of this application; regarding the above step S1020, it may include, but is not limited to, steps S1110 and S1120.

[0162] Step S1110: Determine the reference temperature by selecting the maximum temperature from the ambient temperature and the reference temperature.

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

[0164] It is understandable that the reference temperature under the hot water tank priority command is higher than the reference temperature under the air conditioner cooling priority command.

[0165] It is understood that the reference temperature under the air conditioning cooling priority command can be 28°C, 35°C, 37°C, or between 28°C and 37°C. This application does not specifically limit it.

[0166] It is understood that the reference temperature under the priority command for hot water production in the water tank can be 37°C, 42°C, 47°C, or between 37°C and 47°C. This application does not specifically limit it.

[0167] In addition, such as Figure 12 As shown, Figure 12 This is a flowchart of a control method for a multi-split air conditioning system provided in another embodiment of this application; regarding the determination of the fan speed change value based on the refrigerant saturation temperature and the temperature judgment threshold in step S1120 above, it may include, but is not limited to, steps S1210 and S1220.

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

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

[0170] It is understandable that if the refrigerant saturation temperature is lower than the first temperature threshold, it means that the exhaust pressure is too low. Therefore, the fan speed is adjusted based on the fan speed change to increase the exhaust pressure.

[0171] It is understood that the fifth preset parameter mentioned above can be 0°C, 5°C, 8°C, or between 0°C and 8°C. This application embodiment does not specifically limit it.

[0172] In addition, such as Figure 13 As shown, Figure 13This is a flowchart of a control method for a multi-split air conditioning system provided in another embodiment of this application; regarding the determination of the fan speed change value based on the refrigerant saturation temperature and the temperature judgment threshold in step S1120 above, it may include, but is not limited to, steps S1310 and 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, wherein the second temperature judgment threshold is the sum of the maximum temperature and the sixth preset parameter.

[0175] It is understandable that if the refrigerant saturation temperature is greater than the second temperature threshold, it indicates that the exhaust pressure is too high. Therefore, the fan speed is adjusted based on the fan speed change to reduce the exhaust pressure.

[0176] It is understood that the constant multiple mentioned above can be 2 times, and can be set according to actual needs. This application does not impose specific limitations on it.

[0177] For example, the change in fan speed is twice the difference between the refrigerant saturation temperature and the second temperature threshold.

[0178] It is understood that the sixth preset parameter mentioned above can be 5℃, 10℃, 15℃, or between 5℃ and 15℃. This application embodiment does not specifically limit it.

[0179] In addition, such as Figure 14 As shown, Figure 14 This is a flowchart of a control method for a multi-split air conditioning system provided in another embodiment of this application; regarding the determination of the fan speed change value based on the refrigerant saturation temperature and the temperature judgment threshold in step S1120 above, it may include, but is not limited to, steps S1410 and 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 change in fan speed is zero.

[0182] It is understandable that if 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 means that the exhaust pressure is in a stable state. Therefore, there is no need to adjust the speed of the outdoor unit fan.

[0183] In addition, such as Figure 15 As shown, Figure 15This is a flowchart of a control method for a multi-split air conditioning system provided in another embodiment of this application; the control method for the multi-split air conditioning system also includes, but is not limited to, steps S1510 and S1520.

[0184] Step S1510: Determine the corresponding third temperature range based on the ambient temperature;

[0185] Step S1520: Determine the maximum and / or minimum speed of the outdoor unit fan based on the third temperature range.

[0186] Understandably, the maximum speed of the outdoor unit fan is set as follows: If the ambient temperature is >45°C, the recommended maximum fan speed is 800 r / min, with a range of 720–960 r / min; if the ambient temperature is 38°C <45°C, the recommended maximum fan speed is 760 r / min, with a range of 650–800 r / min; if the ambient temperature is ≤38°C, the recommended maximum fan speed is 600 r / min, with a range of 480–650 r / min.

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

[0188] In one embodiment, the minimum rotational speed value mentioned above can be 120 r / min, 150 r / min, 200 r / min, 250 r / min, or between 120 r / min and 250 r / min. This application does not specifically limit it.

[0189] Based on the control methods of the multi-unit air conditioning system described in the above embodiments, the overall embodiments of the control methods of the multi-unit air conditioning system of this application are presented below.

[0190] like Figure 16 As shown, Figure 16 This is a flowchart of a control method for a multi-unit air conditioning system provided in an overall embodiment of this application;

[0191] Under the corresponding priority control commands, the control targets of the outdoor unit fans are adjusted for different operating modes, thereby changing the relevant effects; the different operating modes and the control targets of the outdoor unit fans are shown in Table 1 below:

[0192] Table 1

[0193]

[0194] 1.1 Decision logic;

[0195] 1. After the indoor unit of the air conditioner is turned on for cooling and the indoor unit of the water tank is turned on for hot water, the indoor unit of the air conditioner will detect the indoor temperature T1, the set temperature Ts, and the outdoor unit fan speed; the indoor unit of the water tank will detect the water temperature Tw and the set water temperature Tws; and the outdoor unit will detect the ambient temperature T4.

[0196] 2. The corresponding indoor unit in the water tank sends a priority control command to the outdoor unit; the outdoor unit mode is determined based on the cooling demand of the indoor unit and the hot water demand of the indoor unit in the water tank, that is, the target cooling and hot water mode is determined.

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

[0198] 1.2 Prioritize air conditioning cooling performance;

[0199] The indoor unit in the water tank sends a priority command for air conditioning cooling.

[0200] a. The outdoor unit is in the primary cooling / hot water mode, and the outdoor unit fan is in "low pressure control":

[0201] When the outdoor unit fan starts, it initializes the outdoor unit fan frequency based on the ambient temperature. After initialization, if the outdoor unit fan speed X≠0, the outdoor unit fan is adjusted every time interval t1, with the adjustment range X∈[fmin, fmax]. The recommended adjustment period t1 is 40s, ranging from 20 to 90s; the recommended minimum outdoor unit fan speed fmin is 150 r / min, ranging from 120 to 250 r / min; the maximum outdoor unit fan speed fmax is limited based on the ambient temperature T4, as described below.

[0202] The outdoor unit fan adjustment method based on the outdoor unit heat exchanger coil temperature T3 is as follows:

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

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

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

[0206] Among them, the recommended value of the first preset parameter α is 7℃, with a range of 4 to 8℃;

[0207] The recommended value for the second preset parameter β is 0℃, with a range of -5 to 5℃.

[0208] The recommended value for the third preset parameter γ is 2℃, with a range of 0~4℃;

[0209] The fourth preset parameter δ is recommended to be 8℃, with a range of 5~10℃;

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

[0211] If T4 > 45, then the maximum speed of the outdoor unit fan, fmax1, is recommended to be 800 r / min, with a range of 720 to 960 r / min.

[0212] If 38 < T4 ≤ 45, then the maximum speed of the outdoor unit fan, fmax2, is recommended to be 760 r / min, with a range of 650 to 800 r / min.

[0213] If T4≤38℃, the maximum speed of the outdoor unit fan fmax3 is recommended to be 600r / min, with a range of 480~650r / min;

[0214] b. The outdoor unit is in the second cooling / hot water mode, and the outdoor fan is in "IPM control-A":

[0215] When the outdoor unit fan starts, it initializes the fan frequency based on the ambient temperature. After initialization, if the fan speed X≠0, the outdoor unit fan is adjusted every time interval t1, with the adjustment range X∈[fmin, fmax]. The recommended adjustment period t1 is 40s, ranging from 20 to 90s; the recommended minimum fan speed fmin is 150 r / min, ranging from 120 to 250 r / min; the maximum fan speed fmax is limited based on the ambient temperature T4, as described below.

[0216] The outdoor unit fan adjustment method is as follows: Outdoor unit fan speed = Current outdoor unit fan speed X + Fan speed change ΔX

[0217] Refer to Table 2 below for the fan speed change value △X:

[0218] Table 2

[0219] Trg_T-IPM+a<T-IPM Rise directly to 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, with a range of 10 to 15; the recommended value of the second preset threshold b is 5, with a range of 2 to 8; and the recommended value of the third preset threshold c is -5, with a range of -2 to -8.

[0221] like Figure 17 As shown, Figure 17 This is a schematic diagram illustrating the correspondence between ambient temperature and the target power module detection temperature according to an embodiment of this application;

[0222] The target power module's detected temperature values ​​are shown in Table 3 below:

[0223] Table 3

[0224]

[0225]

[0226] The maximum speed of the outdoor unit fan is as follows:

[0227] If T4 > 45, the maximum speed of the outdoor unit fan, fmax, is recommended to be 800 r / min, with a range of 720 to 960 r / min.

[0228] If 38 < T4 ≤ 45, then the maximum speed of the outdoor unit fan, fmax, is recommended to be 760 r / min, with a range of 650 to 800 r / min.

[0229] If T4≤38℃, the maximum speed of the outdoor unit fan, fmax, is recommended to be 600 r / min, with a range of 480~650 r / min;

[0230] c. The outdoor unit is in the third cooling / hot water mode, and the outdoor unit fan is in "High Pressure Control-A":

[0231] When the outdoor unit fan starts, it initializes the fan frequency based on the ambient temperature. After initialization, if the fan speed X≠0, the outdoor unit fan is adjusted every time interval t1, with the adjustment range X∈[fmin, fmax]. The recommended adjustment period t1 is 40s, ranging from 20 to 90s; the recommended minimum fan speed fmin is 150 r / min, ranging from 120 to 250 r / min; the maximum fan speed fmax is limited based on the ambient temperature T4, as described below.

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

[0233] (1) When the refrigerant saturation temperature Tc corresponding to the compressor's discharge pressure is < K1, ΔX = 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] in,

[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 reference temperature T4_CoolW_Min is 35℃, with a range of 28~37℃; the recommended value for the fifth preset parameter CoolW_TEMP_A is 5℃, with a range of 0~8℃; the recommended value for the sixth preset parameter CoolW_TEMP_B is 10℃, with a range of 5~15℃.

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

[0241] If T4 > 45, the maximum speed of the outdoor unit fan, fmax, is recommended to be 800 r / min, with a range of 720 to 960 r / min.

[0242] If 38 < T4 ≤ 45, then the maximum speed of the outdoor unit fan, fmax, is recommended to be 760 r / min, with a range of 650 to 800 r / min.

[0243] If T4≤38℃, the maximum speed of the outdoor unit fan, fmax, is recommended to be 600 r / min, with a range of 480~650 r / min;

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

[0245] (1) If T4 > 34, the minimum speed of the outdoor unit fan is fmin, the recommended value is 500 r / min, and the range is 480 to 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 to 300 r / min;

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

[0249] 1.3 Water tank performance is a priority;

[0250] The water tank sends a priority command to produce hot water.

[0251] a. The outdoor unit mode is the primary cooling / hot water mode, and the outdoor unit fan uses "low pressure control", which is the same as the air conditioner priority mode.

[0252] b. The outdoor unit mode is the second cooling / hot water mode. The outdoor unit fan uses "IPM control-B". Based on the priority of air conditioning cooling, the target power module automatically adjusts the temperature by one level. That is, for example, if the T4 temperature detection uses Trg_T-IPM1, it actually executes Trg_T-IPM2; if the T4 temperature detection is determined by Trg_T-IPM4, it still executes Trg_T-IPM4.

[0253] c. The outdoor unit mode is the third cooling and hot water mode. The outdoor unit fan uses "high pressure control-B" to increase the T4_CoolW_Min value on the basis of prioritizing air conditioning cooling. That is, the recommended value of T4_CoolW_Min is 42℃, with a range of 37~47℃.

[0254] It is worth noting that the embodiments of this application can achieve air conditioning and domestic hot water without conflict during transitional seasons and winter, meeting the diverse needs of users; in addition, the embodiments of this application can utilize the waste heat of air conditioning cooling in various ways to produce domestic hot water, reducing electric auxiliary heating and saving energy.

[0255] Based on the control methods of the multi-unit air conditioning system described in the above embodiments, the following presents various embodiments of the controller, multi-unit air conditioning system, computer-readable storage medium, and computer program product of this application.

[0256] like Figure 18 As shown, Figure 18 This is a schematic diagram of a controller for executing a control method for a multi-unit system according to an embodiment of this application. The controller 700 implemented in this application includes: a processor 710, a memory 720, and a computer program stored in the memory 720 and executable on the processor 710, wherein... Figure 18 The example uses a processor 710 and a memory 720.

[0257] The processor 710 and memory 720 can be connected via a bus or other means. Figure 18 Taking the example of a connection between China and Israel via a bus.

[0258] Memory 720, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 720 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 720 may optionally include remotely located memories 720 relative to processor 710, which can be connected to controller 700 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

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

[0260] exist Figure 18 In the controller 700 shown, the processor 710 can be used to call the control program stored in the memory 720, thereby implementing the control method of the multi-unit system described above. Specifically, the non-transitory software program and instructions required to implement the control method of the multi-unit system described above are stored in the memory 720. When executed by the processor 710, the control method of the multi-unit system described above is executed.

[0261] It is worth noting that, since the controller 700 of this application embodiment can execute the control method of the multi-unit system of any of the above embodiments, the specific implementation method and technical effects of the controller 700 of this application embodiment can be referred to the specific implementation method and technical effects of the control method of the multi-unit system of any of the above embodiments.

[0262] Furthermore, one embodiment of this application also provides a multi-split air conditioning system, which includes the controller described in the above embodiment.

[0263] It is worth noting that, since the multi-split air conditioning system of this application includes the controller of the above embodiments, and the controller of the above embodiments can execute the control method of the multi-split air conditioning system of any of the above embodiments, the specific implementation method and technical effect of the multi-split air conditioning system of this application can refer to the specific implementation method and technical effect of the control method of the multi-split air conditioning system of any of the above embodiments.

[0264] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the control method of the multi-unit system described above. Exemplarily, the above-described control method is performed... Figures 2 to 16 The methods and steps in the text.

[0265] It is worth noting that, since the computer-readable storage medium of this application embodiment can execute the control method of the multi-unit system of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of this application embodiment can be referred to the specific implementation and technical effects of the control method of the multi-unit system of any of the above embodiments.

[0266] Furthermore, one embodiment of this application also provides a computer program product, including a computer program or computer instructions, which 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 executes the computer program or computer instructions, causing the computer device to perform the control method for the multi-connected system described above. Exemplarily, the above-described method is performed... Figures 2 to 16 The methods and steps in the text.

[0267] It is worth noting that, since the computer program product of this application embodiment can execute the control method of the multi-unit system of any of the above embodiments, the specific implementation method and technical effect of the computer program product of this application embodiment can refer to the specific implementation method and technical effect of the control method of the multi-unit system of any of the above embodiments.

[0268] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media 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 disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0269] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: 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 the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

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

[0272] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A control method of a multi VRF system, characterized by, The multi-split air conditioning system includes an outdoor unit, an indoor air conditioning 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 indoor air conditioning unit and the compressor's suction port. The second reversing valve is connected to the compressor's discharge port and the water tank indoor unit. The third reversing valve is connected to the compressor's discharge port, suction port, and the outdoor heat exchanger. The outdoor heat exchanger is also connected to the indoor air conditioning unit and the water tank indoor unit via a main expansion valve. The method includes: Obtain the target cooling and hot water production mode and priority control command of the multi-split system, wherein the priority control command includes air conditioning cooling priority command and water tank hot water production priority command; The speed of the outdoor unit fan is controlled according to the target cooling and hot water production mode and the priority control command; The target cooling-to-hot water mode includes a second cooling-to-hot water mode. In the second cooling-to-hot water mode, the first reversing valve connects the indoor unit of the air conditioner and the suction port of the compressor, the second reversing valve connects the discharge port of the compressor and the indoor unit of the water tank, the third reversing valve connects the outdoor heat exchanger and the suction port of the compressor, and the main expansion valve is in a cut-off state. Controlling the speed of the outdoor unit fan according to the target cooling-to-hot water mode and the priority control command includes: In the second cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the ambient temperature and the current power module detection temperature of the electronic control PCB board are obtained; The first temperature range is determined based on the ambient temperature, and the target power module detection temperature of the electronic control PCB board is determined based on the first temperature range. The target power module detection temperature corresponding to the first temperature range of the current setting under the air conditioning cooling priority command is equal to the target power module detection temperature corresponding to the first temperature range of the next lower setting under the water tank hot water priority command. The fan speed change is determined based on the current power module's detected temperature and the target power module's detected temperature. The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

2. The method of claim 1, wherein, The target cooling and hot water production mode includes a first cooling and hot water production mode. In the first cooling and hot water production mode, the first reversing valve connects the air conditioner indoor unit and the air intake of the compressor, the second reversing valve connects the compressor exhaust port and the water tank indoor unit, the third reversing valve connects the outdoor heat exchanger and the air intake of the compressor, and the main expansion valve is in the conducting state. The step of controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command includes: In the first cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the ambient temperature and the outdoor unit heat exchanger coil temperature of the outdoor heat exchanger are obtained. The fan speed change value is determined based on the ambient temperature and the outdoor unit heat exchanger coil temperature. The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

3. The method of claim 2, wherein, The determination of the fan speed change based on the ambient temperature and the outdoor unit heat exchanger coil temperature includes one of the following: A first difference between the ambient temperature and a first preset parameter is determined. When the temperature of the outdoor unit heat exchanger coil is less than the minimum value of the first difference and the second preset parameter, the difference between the first difference and the minimum value of the second preset parameter and the temperature of the outdoor unit heat exchanger coil is taken 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, take the constant multiple of the difference between the second difference and the minimum value of 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, the change in fan speed is determined to be zero.

4. The method of claim 1, wherein, The step of determining the fan speed change value based on the current power module's detected temperature and the target power module's detected temperature includes: Multiple second temperature ranges are determined based on the temperature detected by the target power module; The change in fan speed is determined based on the second temperature range in which the current power module detects the temperature.

5. The method of claim 1, wherein, The target cooling and hot water production mode includes a third cooling and hot water production mode. In the third cooling and hot water production mode, the first reversing valve connects the air conditioner indoor unit and the air intake of the compressor, the second reversing valve connects the compressor exhaust port and the water tank indoor unit, the third reversing valve connects the compressor exhaust port and the outdoor heat exchanger, and the main expansion valve is in the conducting state. The step of controlling the speed of the outdoor unit fan according to the target cooling / hot water mode and the priority control command includes: In the third cooling and hot water mode, when the priority control command is an air conditioning cooling priority command or a water tank hot water priority command, the refrigerant saturation temperature corresponding to the ambient temperature and the compressor discharge pressure is obtained; The fan speed change value is determined based on the ambient temperature and the refrigerant saturation temperature. The speed of the outdoor unit fan is adjusted based on the change in fan speed between the minimum and maximum speed values.

6. The method of claim 5, wherein, The step of determining the fan speed change value based on the ambient temperature and the refrigerant saturation temperature includes: Determine a reference temperature, and filter out the maximum temperature from the ambient temperature and the reference temperature; The temperature judgment threshold is determined based on the maximum temperature value, and the fan speed change value is determined based on the refrigerant saturation temperature and the temperature judgment threshold. Wherein, the reference temperature under the air conditioning cooling priority command is lower than the reference temperature under the water tank hot water production priority command.

7. The method of claim 6, wherein, The step of determining the fan speed change value based on the refrigerant saturation temperature and the temperature 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, wherein 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, the constant multiple of the difference between the refrigerant saturation temperature and the second temperature judgment threshold is taken as the fan speed change value, wherein 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 change in fan speed is determined to be zero.

8. The method of claim 1, 2, or 5, wherein, The method further includes: The corresponding third temperature range is determined based on the ambient temperature. The maximum speed value and / or the minimum speed value of the outdoor unit fan are determined based on the third temperature range.

9. A controller characterized by comprising: include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the control method for a multi-unit system as described in any one of claims 1 to 8.

10. A multi-split system, characterized in that, Includes the controller as described in claim 9.

11. A computer-readable storage medium, characterized in that: The system stores computer-executable instructions for performing a control method for a multi-unit system as described in any one of claims 1 to 8.

12. A computer program product comprising computer programs 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 executes the computer program or the computer instructions, causing the computer device to perform the control method for a multi-unit system as described in any one of claims 1 to 8.

Images