Control method and control device of multi-split heat pump system, and multi-split heat pump system

Abstract

The application provides a control method and device of a multi-connected heat pump system and the multi-connected heat pump system. The control method comprises the following steps: acquiring a current water temperature inside the water tank; acquiring a current operation mode of the outdoor unit when it is determined that there is a heating demand according to the current water temperature; determining a refrigeration output condition of the outdoor unit according to the operation time of the compressor when the current operation mode is a refrigeration mode, wherein the refrigeration output condition comprises that the refrigeration output meets a refrigeration demand and the refrigeration output does not meet the refrigeration demand; and switching the current operation mode of the outdoor unit to a heating mode and controlling the hydraulic module to be turned on when it is determined that the refrigeration output of the outdoor unit meets the refrigeration demand. According to the technical scheme of the embodiment of the application, the diversified use demands of users can be better met, and the use comfort and experience of users can be greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump, in particular to a control method and control device of a multi-split heat pump system and the multi-split heat pump system. BACKGROUND

[0002] At present, the multi-split air conditioning system can be matched with various terminals, such as indoor unit terminals for providing air conditioning service or heating terminals for providing domestic hot water service. The multi-split heat pump system can be matched with multiple indoor units and heating terminals, and can simultaneously have the functions of air conditioning and providing domestic hot water. However, since the indoor unit and the heating terminal share a set of multi-split heat pump system, the operation mode of the outdoor unit corresponding to different functional use requirements will be different, that is, there is a mode conflict problem. In the related art, a fixed control logic is usually used to control the operation of the multi-split heat pump system in the corresponding time period, that is, the outdoor unit can only work in a certain operation mode. When the user has multiple functional use requirements, it is difficult to balance the different requirements of the user, and it is difficult to meet the diversified use requirements of the user, thereby reducing the use comfort and experience of the user. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a control method and control device of a multi-split heat pump system and the multi-split heat pump system, which can better meet the diversified use requirements of the user and greatly improve the use comfort and experience of the user.

[0004] In a first aspect, an embodiment of the present application provides a control method of a multi-split heat pump system, the multi-split heat pump system comprising an outdoor unit, a water module, a water tank and at least one indoor unit, the outdoor unit being connected with the water module and the indoor unit respectively, an output end of the water module being connected to the water tank, the water module being used to provide hot water for the water tank, and the control method comprising:

[0005] obtaining a current water temperature inside the water tank;

[0006] when it is determined that there is a heating requirement according to the current water temperature, obtaining a current operation mode of the outdoor unit;

[0007] in a case where the current operation mode is a cooling mode, judging a cooling output condition of the outdoor unit according to a running time of a compressor, wherein the cooling output condition comprises that the cooling output meets a cooling requirement and the cooling output does not meet the cooling requirement;

[0008] when it is determined that the cooling output of the outdoor unit meets the cooling requirement, switching the current operation mode of the outdoor unit to a heating mode and controlling the water module to be turned on.

[0009] The control method of the multi-split heat pump system provided by the embodiment of the present application has at least the following beneficial effects: by obtaining the current water temperature in the water tank, when it is determined according to the current water temperature that there is a heating demand, that is, the water in the water tank needs to be heated, and there is a hot water heating demand at present, the current operation mode of the outdoor unit is obtained, when the current operation mode of the outdoor unit is the cooling mode, that is, there is a cooling demand at present, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, so as to determine whether the cooling output of the outdoor unit meets the cooling demand of the user, when it is determined that the cooling output of the outdoor unit meets the cooling demand, that is, the demand with higher priority at present is the hot water heating demand, the current operation mode of the outdoor unit is switched to the heating mode and the hydraulic module is controlled to be turned on, so as to preferentially meet the hot water heating demand of the user, by determining the demand with higher priority according to the cooling output condition of the outdoor unit when the hot water heating demand and the cooling demand exist at the same time, the current operation mode of the outdoor unit is flexibly adjusted, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user can be greatly improved.

[0010] In the control method of the multi-split heat pump system, the water tank is provided with a water tank electric heating device, and when the current operation mode of the outdoor unit is the cooling mode, the control method further comprises:

[0011] When it is determined that the cooling output of the outdoor unit does not meet the cooling demand, the current operation mode of the outdoor unit is kept as the cooling mode and the hydraulic module is controlled to be turned off, and the water tank electric heating device is controlled to be turned on.

[0012] In the embodiment, when it is determined that the cooling output of the outdoor unit does not meet the cooling demand, that is, the demand with higher priority at present is the cooling demand, the cooling demand of the user needs to be preferentially met, and the hot water heating demand is relatively low, the current operation mode of the outdoor unit is kept as the cooling mode and the hydraulic module is controlled to be turned off, so as to preferentially meet the cooling demand of the user, at this time, the operation state of the multi-split air conditioning system can be understood as the cooling state, and the water tank electric heating device is controlled to be turned on, so as to heat the water in the water tank, thereby considering the hot water heating demand of the user at the same time, and the diversified use demand of the user can be better met and the experience of the user can be improved.

[0013] In the control method of the multi-split heat pump system, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, including one of the following:

[0014] When the operation time of the compressor is greater than or equal to the preset operation time, it is determined that the cooling output of the outdoor unit meets the cooling demand;

[0015] determining that the cooling output of the outdoor unit does not meet the cooling demand when the running time of the compressor is less than the preset running time.

[0016] In the embodiment, when the running time of the compressor is greater than or equal to the preset running time, it indicates that the compressor has continuously operated for a certain time, and it can be considered that the cooling capacity provided by the compressor meets the cooling capacity required by the user. Therefore, it is determined that the cooling output of the outdoor unit meets the cooling demand. When the running time of the compressor is less than the preset running time, it can be considered that the cooling capacity provided by the compressor does not meet the cooling capacity required by the user. Therefore, it is determined that the cooling output of the outdoor unit does not meet the cooling demand. The running time of the compressor can be used to more accurately evaluate whether the cooling output of the outdoor unit meets the cooling demand of the user, so that the priority of the demand can be better determined in the subsequent process, thereby improving the operation intelligence of the multi-split heat pump system.

[0017] In the control method of the multi-split heat pump system, before the running time of the compressor is used to determine the cooling output of the outdoor unit, the control method further comprises:

[0018] obtaining an outdoor environment temperature;

[0019] determining that the outdoor unit operates in a heating operation temperature range according to the outdoor environment temperature.

[0020] In the embodiment, when it is determined that the outdoor unit operates in the heating operation temperature range, it indicates that the outdoor environment temperature is in the heating operation temperature range, i.e., there is no high-pressure risk for the outdoor unit. Therefore, the running time of the compressor can be used to determine the cooling output of the outdoor unit, so that the current operation mode of the outdoor unit can be switched to the heating mode when it is determined that the cooling output of the outdoor unit meets the cooling demand, thereby preventing the compressor from stopping and ensuring that the outdoor unit can stably operate in the heating mode, which is beneficial to improve the stability and reliability of the multi-split air conditioning system.

[0021] In the control method of the multi-split heat pump system, when the current operation mode is the cooling mode, the control method further comprises:

[0022] controlling the outdoor unit to keep operating in the cooling mode, controlling the hydraulic module to be closed, and controlling the water tank electric heating device to be turned on when the outdoor environment temperature is greater than the upper limit value of the heating operation temperature range.

[0023] In the embodiment, when the current operation mode of the outdoor unit is the cooling mode, if the outdoor environment temperature is greater than the upper limit value of the heating operation temperature range, that is, the outdoor environment temperature exceeds the heating operation temperature range, it indicates that the outdoor unit has a high pressure risk, at this time, the outdoor unit is not suitable to operate in the heating mode, the outdoor unit is controlled to keep operating in the cooling mode and the water power module is controlled to be closed, so as to facilitate the cooling demand of the user, and the water tank electric heating device is controlled to be turned on, so as to facilitate the hot water heating demand of the user, so that the multi-split air conditioning system can consider the cooling demand and the hot water heating demand under the premise of ensuring stable operation, which can not only meet the diversified use demand of the user, but also ensure the stability and reliability of the multi-split air conditioning system.

[0024] In the control method of the multi-split heat pump system, the water power module includes a refrigerant circulation loop, a water circulation loop and a water side heat exchanger, the refrigerant circulation loop is connected with the compressor and the first heat exchange side of the water side heat exchanger respectively, the water circulation loop is connected with the second heat exchange side of the water side heat exchanger and the input end of the water tank respectively, the water circulation loop is provided with a water pump, an electronic expansion valve and a water circuit electric heating device, after the water tank electric heating device is controlled to be turned on, the control method further includes:

[0025] When the time that the water tank electric heating device is continuously turned on is greater than the preset heating time and the current water temperature is less than the preset target water temperature, the refrigerant circulation loop is controlled to be closed, and the water pump, the electronic expansion valve and the water circuit electric heating device are controlled to be turned on.

[0026] In the embodiment, when the time that the water tank electric heating device is continuously turned on is greater than the preset heating time and the current water temperature is less than the preset target water temperature, the anti-freezing function of the water power module can be turned on, the refrigerant circulation loop can be controlled to keep in the closed state, the water pump, the electronic expansion valve and the water circuit electric heating device are controlled to be turned on, so that the water circulation loop is re-opened, since the water circuit electric heating device can heat the water in the water circulation loop, the heated water can transfer heat to the water tank, so as to heat the water in the water tank, it can be understood that by re-opening the water circulation loop, the water in the water circulation loop can continuously flow, and the water circuit electric heating device is used to quickly increase the water flow temperature, which can better reduce the freezing of the water power module due to low temperature, and is beneficial to improve the reliability of the multi-split heat pump system.

[0027] In the control method of the multi-split heat pump system, in the case that the current operation mode is the heating mode, the control method further includes:

[0028] When the running time of the compressor is greater than the preset running time and the current water temperature is less than the first preset critical value, the outdoor unit is controlled to keep running in the heating mode, the indoor unit in the heating mode is controlled to switch to the standby mode, and the hydraulic module is controlled to be turned on.

[0029] In the embodiment, since the running mode of the outdoor unit corresponding to the indoor heating demand and the running mode of the outdoor unit corresponding to the hot water heating demand are the same, that is, the outdoor unit can run in the heating mode, the outdoor unit is controlled to keep running in the heating mode and the hydraulic module is controlled to be turned on, so that the hydraulic module can provide hot water for the water tank, thereby achieving heating of the water in the water tank, facilitating meeting the hot water heating demand of the user. In addition, in order to reduce the situation that low water temperature pulls down the outlet air temperature of the indoor unit, when the running time of the compressor is greater than the preset running time, it can be determined that the heating output of the outdoor unit meets the indoor heating demand of the user, and then the indoor unit in the heating mode can be controlled to switch to the standby mode. At this time, the hot water heating demand can be preferentially met, and the situation that the indoor unit blows cold air can be effectively reduced, which is beneficial to greatly improving the use comfort of the user.

[0030] In the control method of the above multi-split heat pump system, when the current running mode is the heating mode, the control method further comprises:

[0031] When the running time of the compressor is greater than the preset running time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit is controlled to keep running in the heating mode, and the hydraulic module is controlled to be turned on.

[0032] Or, when the running time of the compressor is less than the preset running time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit is controlled to keep running in the heating mode, and the hydraulic module is controlled to be turned on.

[0033] The first preset critical value is less than the preset target water temperature.

[0034] In the embodiment, when the current operation mode of the outdoor unit is the heating mode, it indicates that there is currently an indoor heating demand, when the operation time of the compressor is greater than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit can be controlled to keep operating in the heating mode, the water force module is controlled to be turned on, so that the water force module can provide hot water for the water tank, so that the current water temperature in the water tank can reach the preset target water temperature faster, and the indoor heating demand of the user can be met; when the operation time of the compressor is less than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit can be controlled to keep operating in the heating mode, and the water force module is controlled to be turned on, so that the indoor heating demand and the indoor heating demand of the user can be met at the same time, and the experience of the user is improved.

[0035] In the control method of the above multi-split heat pump system, the water tank is provided with a water tank electric heating device, and the water force module includes a water circuit electric heating device. After the water force module is controlled to be turned on, the control method further includes:

[0036] obtaining a heating time during which the water force module is continuously turned on;

[0037] when the current water temperature is less than the preset target water temperature, controlling the operation power of the water tank electric heating device and the water circuit electric heating device according to the heating time.

[0038] In the embodiment, after the water force module is controlled to be turned on, if the current water temperature of the water tank is less than the preset target water temperature, it indicates that the current water temperature still does not meet the hot water heating demand of the user, and then the operation power of the water tank electric heating device and the operation power of the water circuit electric heating device can be controlled according to the heating time during which the water force module is continuously turned on, that is, the working states of the water tank electric heating device and the water circuit electric heating device are controlled in sequence, so that the flexibility of the water tank electric heating device and the water circuit electric heating device can be improved.

[0039] In the control method of the above multi-split heat pump system, the control of the operation power of the water tank electric heating device and the water circuit electric heating device according to the heating time includes:

[0040] when the heating time is greater than a first preset time, the water tank electric heating device is controlled to operate at a first preset power;

[0041] when the heating time is greater than a second preset time, the water tank electric heating device is controlled to operate at a second preset power;

[0042] when the heating time is greater than a third preset time, the water tank electric heating device is controlled to operate at a third preset power;

[0043] when the heating time is greater than a fourth preset time, controlling the water tank electric heating device to keep operating at the third preset power and controlling the waterway electric heating device to operate at a fourth preset power;

[0044] when the heating time is greater than a fifth preset time, controlling the water tank electric heating device to keep operating at the third preset power and controlling the waterway electric heating device to operate at a fifth preset power;

[0045] wherein the first preset power, the second preset power, and the third preset power increase sequentially, the fifth preset power is greater than the fourth preset power, and the first preset time, the second preset time, the third preset time, the fourth preset time, and the fifth preset time increase sequentially.

[0046] In this embodiment, by reasonably controlling the operating power of the water tank electric heating device and the operating power of the waterway electric heating device in time sequence, the hot water heating demand of the user can be met, and energy saving can be achieved.

[0047] In the control method of the above multi-split heat pump system, the control method further comprises:

[0048] when the heating time is greater than a sixth preset time and the current water temperature is less than the preset target water temperature, controlling the water force module to be closed, the water tank electric heating device to be closed, and the waterway electric heating device to be closed, and outputting a fault signal; wherein the sixth preset time is greater than the fifth preset time.

[0049] In this embodiment, when the heating time during which the water force module is continuously turned on is greater than the sixth preset time and the current water temperature is less than the preset target water temperature, it indicates that the water force module has been continuously turned on for a long time but the water tank water temperature has not reached the expected water temperature, and it is considered that the multi-split heat pump system has a fault risk. Therefore, the water force module is controlled to be closed, the water tank electric heating device is controlled to be closed, and the waterway electric heating device is controlled to be closed, so as to ensure the safety and reliability of the multi-split heat pump system, and a fault signal is outputted to remind the user that the multi-split heat pump system has a fault risk, so as to facilitate timely fault maintenance.

[0050] In the control method of the above multi-split heat pump system, the control method further comprises:

[0051] in the case where the current operating mode is the standby mode, switching the current operating mode of the outdoor unit to the heating mode and controlling the water force module to be turned on.

[0052] In this embodiment, when the current operation mode of the outdoor unit is the standby mode, and there is a hot water heating demand at this time, the current operation mode of the outdoor unit can be switched to the heating mode, and the hydraulic module is controlled to be turned on, so that the hydraulic module can provide hot water for the water tank, thereby achieving heating of the water in the water tank, meeting the hot water heating demand of the user, and improving the use comfort and experience of the user.

[0053] In the control method of the above multi-split heat pump system, the determining that there is a heating demand according to the current water temperature comprises:

[0054] If the current water temperature is less than a second preset critical value for a preset low temperature time, it is determined that there is a heating demand, wherein the second preset critical value is obtained by subtracting a preset difference value from a preset target water temperature.

[0055] In this embodiment, if the current water temperature is less than the second preset critical value for a preset low temperature time, it is determined that there is a heating demand, indicating that the water in the water tank needs to be heated, i.e. there is a hot water heating demand at present. By subtracting the preset difference value from the preset target water temperature to obtain the second preset critical value and setting the preset low temperature time, it can be more accurately determined whether there is a heating demand.

[0056] In the control method of the above multi-split heat pump system, the control method further comprises:

[0057] During the period when the hydraulic module is turned on, when the current water temperature is greater than the preset target water temperature, the working state of the hydraulic module is controlled to be adjusted to the closed state.

[0058] In the control method of the above multi-split heat pump system, after the control of the water pump being turned on, the electronic expansion valve being turned on and the water route electric heating device being turned on, the control method further comprises:

[0059] When the time during which the water route electric heating device is continuously turned on is greater than a seventh preset time and the current water temperature is less than the preset target water temperature, the hydraulic module is controlled to be closed and the water tank electric heating device is controlled to be closed, and a fault signal is output.

[0060] In this embodiment, during the period when the hydraulic module is turned on, when the current water temperature of the water tank is greater than the preset target water temperature, it indicates that the current water temperature at this time can meet the hot water heating demand of the user, and the working state of the hydraulic module is controlled to be adjusted to the closed state, which can effectively improve the accuracy of control.

[0061] In a second aspect, the embodiments of the present application provide a running control device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to realize the control method as described in the first aspect of the embodiments.

[0062] The operation control device provided by the embodiment of the present application has at least the following beneficial effects: by obtaining the current water temperature inside the water tank, when it is determined according to the current water temperature that there is a heating demand, that is, the water inside the water tank needs to be heated, and that there is a hot water heating demand at present, the current operation mode of the outdoor unit is obtained, when the current operation mode of the outdoor unit is a cooling mode, that is, there is a cooling demand at present, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, so as to determine whether the cooling output of the outdoor unit meets the cooling demand of the user, when it is determined that the cooling output of the outdoor unit meets the cooling demand, that is, the demand with a higher priority at present is the hot water heating demand, the current operation mode of the outdoor unit is switched to a heating mode and the hydraulic module is controlled to be turned on, so as to meet the hot water heating demand of the user preferentially, by determining the demand with a higher priority according to the cooling output condition of the outdoor unit when the hot water heating demand and the cooling demand exist at the same time, the current operation mode of the outdoor unit is flexibly regulated, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user are greatly improved.

[0063] In a third aspect, an embodiment of the present application provides a multi-split heat pump system, which comprises the operation control device as described in the second aspect above.

[0064] The multi-split heat pump system provided by the embodiment of the present application has at least the following beneficial effects: by obtaining the current water temperature inside the water tank, when it is determined according to the current water temperature that there is a heating demand, that is, the water inside the water tank needs to be heated, and that there is a hot water heating demand at present, the current operation mode of the outdoor unit is obtained, when the current operation mode of the outdoor unit is a cooling mode, that is, there is a cooling demand at present, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, so as to determine whether the cooling output of the outdoor unit meets the cooling demand of the user, when it is determined that the cooling output of the outdoor unit meets the cooling demand, that is, the demand with a higher priority at present is the hot water heating demand, the current operation mode of the outdoor unit is switched to a heating mode and the hydraulic module is controlled to be turned on, so as to meet the hot water heating demand of the user preferentially, by determining the demand with a higher priority according to the cooling output condition of the outdoor unit when the hot water heating demand and the cooling demand exist at the same time, the current operation mode of the outdoor unit is flexibly regulated, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user are greatly improved.

[0065] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are used to make a computer execute the control method as described in the first aspect above.

[0066] According to the computer readable storage medium provided by the embodiment of the application, at least the following beneficial effects are achieved: by acquiring the current water temperature in the water tank, when it is determined according to the current water temperature that there is a heating demand, that is, the water in the water tank needs to be heated, and there is a hot water heating demand at present, the current operation mode of the outdoor unit is acquired, when the current operation mode of the outdoor unit is the cooling mode, that is, there is a cooling demand at present, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, so as to determine whether the cooling output of the outdoor unit meets the cooling demand of the user, when it is determined that the cooling output of the outdoor unit meets the cooling demand, that is, the demand with higher priority at present is the hot water heating demand, the current operation mode of the outdoor unit can be switched to the heating mode and the hydraulic module is controlled to be turned on, so as to meet the hot water heating demand of the user preferentially, by determining the demand with higher priority according to the cooling output condition of the outdoor unit when the hot water heating demand and the cooling demand exist at the same time, the current operation mode of the outdoor unit can be flexibly adjusted, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user can be greatly improved.

[0067] Additional features and advantages of the application are set forth in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0068] The application will be further described below with reference to the drawings and embodiments;

[0069] Figure 1 is a structural schematic diagram of a multi-split heat pump system provided by an embodiment of the application.

[0070] Figure 2 is a flow chart of a control method of a multi-split heat pump system provided by an embodiment of the application.

[0071] Figure 3 is a flow chart of a control method of a multi-split heat pump system provided by an embodiment of the application.

[0072] Figure 4 is a flow chart of a control method of a multi-split heat pump system provided by an embodiment of the application.

[0073] Figure 5 is a flow chart of a control method of a multi-split heat pump system provided by an embodiment of the application.

[0074] Figure 6 is a flow chart of a control method of a multi-split heat pump system provided by an embodiment of the application.

[0075] Figure 7 is a flow chart of a control method of a multi-split heat pump system according to an embodiment seven of the present application;

[0076] Figure 8 is a flow chart of a control method of a multi-split heat pump system according to an embodiment eight of the present application;

[0077] Figure 9 is a partial example flow chart in a whole embodiment of a control method of a multi-split heat pump system according to an embodiment nine of the present application;

[0078] Figure 10 is a partial example flow chart in a whole embodiment of a control method of a multi-split heat pump system according to an embodiment ten of the present application;

[0079] Figure 11 is a structural schematic diagram of a running control device according to an embodiment eleven of the present application. DETAILED DESCRIPTION

[0080] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the accompanying drawings, which serve to supplement the description in the text part of the specification, so that one can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0081] It should be understood that, in the description of the embodiments of the present application, if there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features. "At least one" means one or more, "a plurality of" means two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, the meaning of "several" is one or more, unless otherwise explicitly specified and limited. The association relationship of the associated objects is described as "and / or", which means that there can be three kinds of relationships, that is, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural.

[0082] In addition, unless otherwise explicitly specified and limited, the term "connection / connected" should be understood broadly, for example, it can be fixed connection or movable connection, or detachable connection or non-detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium. It should be noted that although the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in an order different from that in the flow chart.

[0083] It should be noted that the technical features involved in each of the embodiments of the application described below can be combined with each other as long as there is no conflict.

[0084] The control method and device of the multi-split heat pump system and the multi-split heat pump system provided by the embodiments of the application can better meet the diversified use requirements of users and greatly improve the use comfort and experience of users.

[0085] The embodiments of the application will be further described below with reference to the drawings.

[0086] As shown in Figure 1 The multi-split heat pump system provided by the embodiments of the application includes an outdoor unit 100, a water module 200, a water tank 300, and at least one indoor unit 400. The outdoor unit 100 is connected to the water module 200 and the indoor unit 400, respectively. The output end of the water module 200 is connected to the water tank 300, and the water module 200 is used to provide hot water for the water tank 300. It should be noted that the outdoor unit 100 can be understood as an outdoor unit, and the indoor unit 400 can be understood as an indoor unit. The outdoor unit is provided with a compressor 110, and the compressor 110 is connected to the indoor unit and the water module 200, respectively. In this embodiment, the outdoor unit 100 can be matched with the indoor unit 400, the water module 200, and the water tank 300. The multi-split heat pump system can not only provide air conditioning service through the indoor unit 400, but also provide hot water service through the water module 200 and the water tank 300. The air conditioning service can include cooling service and indoor heating service.

[0087] In an embodiment, the water module 200 comprises a refrigerant circulation loop 210, a water circulation loop 220 and a water-side heat exchanger 230, the refrigerant circulation loop 210 is connected with the compressor 110 and the first heat exchange side of the water-side heat exchanger 230 respectively, the water circulation loop 220 is connected with the second heat exchange side of the water-side heat exchanger 230 and the input end of the water tank 300 respectively, the water tank 300 is provided with a water tank heat exchanger 310, the water tank heat exchanger 310 can be coiled on the periphery of the inner container of the water tank 300, the water inlet end of the water tank heat exchanger 310 is communicated with the water circulation loop 220, and the refrigerant circulation loop 210 and the water circulation loop 220 exchange heat. Specifically, the hot water service provided by the water module 200 and the water tank 300 mainly consists of two heat exchange processes, the first heat exchange process is carried out in the water module 200, the high-temperature refrigerant flows out from the exhaust port of the compressor 110 and then flows into the refrigerant circulation loop 210 of the water module 200, at the same time, the water in the water circulation loop 220 passes through the second heat exchange side of the water-side heat exchanger 230, when the refrigerant passes through the first heat exchange side of the water-side heat exchanger 230, the heat can be transferred to the water in the water circulation loop 220, that is, the heat exchange between the refrigerant circulation loop 210 and the water circulation loop 220 is realized, at this time, the water circulation loop 220 obtains the heat of the refrigerant circulation loop 210, so that the water in the water circulation loop 220 is heated, which is convenient for subsequent provision of hot water for the water tank 300; the second heat exchange process is mainly carried out in the water tank 300, the hot water in the water circulation loop 220 can flow into the water tank heat exchanger 310, the hot water flowing through the water tank heat exchanger 310 can exchange heat with the cold water in the water tank 300, so as to heat the water in the water tank 300, which is convenient for meeting the demand of users for using hot water. It should be noted that the water-side heat exchanger 230 can be understood as a refrigerant-water heat exchanger, and the water tank heat exchanger 310 can be understood as a water-water heat exchanger.

[0088] Those skilled in the art can understand that, Figure 1 The multi-split heat pump system shown in the figures does not constitute a limitation on the embodiments of the present application, and can include more or fewer components than shown, or combine certain components, or different component arrangements.

[0089] As Figure 2 shown, the embodiment of the first aspect of the present application provides a control method of a multi-split heat pump system, which includes but is not limited to steps S110 to S140:

[0090] Step S110: obtaining the current water temperature inside the water tank;

[0091] It should be noted that by obtaining the current water temperature inside the water tank 300, the water temperature of the water tank 300 can be monitored, which is conducive to better meeting the demand of users for using hot water.

[0092] Step S120: When it is determined that there is a heating demand according to the current water temperature, the current operation mode of the outdoor unit is obtained;

[0093] According to the current water temperature inside the water tank 300, it can be determined whether the water tank 300 has a heating demand, that is, whether the water in the water tank 300 needs to be heated. When it is determined that there is a heating demand, it means that the water in the water tank 300 needs to be heated, that is, there is currently a hot water heating demand. At this time, the current operation mode of the outdoor unit 100 can be obtained so that a suitable operation mode can be better selected subsequently. Specifically, the current operation mode of the outdoor unit 100 can include but is not limited to a cooling mode, a heating mode, and a standby mode, and the present embodiment does not make a specific limitation thereto.

[0094] Step S130: In the case where the current operation mode is the cooling mode, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, wherein the cooling output condition includes that the cooling output meets the cooling demand and the cooling output does not meet the cooling demand;

[0095] It should be noted that when the current operation mode of the outdoor unit 100 is the cooling mode, it means that there is currently a cooling demand. Therefore, the operation time of the compressor 110 can be obtained, and the cooling output condition of the outdoor unit 100 can be determined according to the operation time of the compressor 110, that is, whether the cooling output of the outdoor unit 100 meets the cooling demand of the user is evaluated.

[0096] Step S140: When it is determined that the cooling output of the outdoor unit meets the cooling demand, the current operation mode of the outdoor unit is switched to the heating mode and the hydraulic module is controlled to be turned on.

[0097] Since the control mode corresponding to the hot water heating demand is different from the control mode corresponding to the cooling demand, the operation mode of the outdoor unit 100 corresponding to the above two demands is also different. When the user needs hot water heating, the outdoor unit 100 usually needs to operate in the heating mode. When the user needs cooling, the outdoor unit 100 usually needs to operate in the cooling mode. However, when there is both a hot water heating demand and a cooling demand, a mode conflict problem occurs, and it is difficult to take into account both the hot water heating demand and the cooling demand. In this embodiment, when there is both a hot water heating demand and a cooling demand, the cooling output condition of the outdoor unit 100 is first determined. When it is determined that the cooling output of the outdoor unit 100 meets the cooling demand, it is considered that the hot water heating demand can be prioritized at this time. Therefore, the current operation mode of the outdoor unit 100 is switched to the heating mode and the hydraulic module 200 is controlled to be turned on. At this time, the operation state of the multi-split air conditioning system can be understood as a hot water state, so that the hydraulic module 200 can provide hot water for the water tank 300, thereby achieving heating of the water in the water tank 300, and further providing the user with a hot water service, thereby facilitating the user's hot water heating demand.

[0098] The control method of the multi-split heat pump system provided by the first aspect of the embodiment can obtain the current water temperature in the water tank 300. When it is determined according to the current water temperature that there is a heating demand, that is, the water in the water tank 300 needs to be heated, and there is a hot water heating demand at present, the current operation mode of the outdoor unit 100 is obtained. When the current operation mode of the outdoor unit 100 is the cooling mode, that is, there is a cooling demand at present, the cooling output condition of the outdoor unit 100 can be determined according to the operation time of the compressor 110, so as to determine whether the cooling output of the outdoor unit 100 meets the cooling demand of the user. When it is determined that the cooling output of the outdoor unit 100 meets the cooling demand, that is, the demand with higher priority at present is the hot water heating demand, the current operation mode of the outdoor unit 100 can be switched to the heating mode and the hydraulic module 200 is controlled to be turned on, so as to meet the hot water heating demand of the user preferentially. By determining the demand with higher priority according to the cooling output condition of the outdoor unit 100 when the hot water heating demand and the cooling demand exist at the same time, the current operation mode of the outdoor unit 100 can be flexibly adjusted, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user can be greatly improved.

[0099] It should be noted that, since the indoor unit 400 and the hydraulic module 200 share a set of multi-split heat pump system, when the hot water heating demand and the cooling demand exist at the same time, the mode conflict of the outdoor unit 100 will occur. Different from the mode in which the outdoor unit 100 is intermittently controlled to operate in the cooling mode and the heating mode in a fixed time period in the related art, the embodiment of the present application first determines whether the cooling output of the outdoor unit 100 meets the cooling demand. When the cooling output of the outdoor unit 100 meets the cooling demand, it indicates that the hot water heating demand of the user needs to be met preferentially at present, and the cooling demand is relatively low. It can be determined that the heating mode is the priority operation mode of the outdoor unit 100, and then the current operation mode of the outdoor unit 100 is switched to the heating mode and the working state of the hydraulic module 200 is controlled to be turned on, so as to achieve the purpose of quickly heating water. By considering the priority between different demands and flexibly selecting the suitable operation mode, the actual demand of the user can be met to the greatest extent, the multi-split heat pump system can better balance the different demands of the user, and in addition, by controlling the hydraulic module 200 to be turned on when the hot water heating demand of the user is met preferentially, the hot water heating efficiency can be improved, and the use of the auxiliary heating device can be reduced, so as to greatly reduce the energy consumption and play a role in energy saving.

[0100] In an embodiment, the water tank 300 is provided with a water tank electric heating device 320, which can directly heat the water in the water tank 300, effectively improve the energy conversion efficiency, and serve the purpose of auxiliary heating of the water in the water tank 300.

[0101] In the control method of the above multi-split heat pump system, when the current operation mode of the outdoor unit is the cooling mode, the control method further comprises the following steps:

[0102] When it is determined that the cooling output of the outdoor unit does not meet the cooling demand, the current operation mode of the outdoor unit is kept as the cooling mode and the hydraulic module is controlled to be closed, and the water tank electric heating device is controlled to be turned on.

[0103] In the present embodiment, when the current operation mode of the outdoor unit 100 is the cooling mode, it indicates that there is currently a cooling demand, and there is also a hot water heating demand at present. When it is determined that the cooling output of the outdoor unit 100 does not meet the cooling demand, it indicates that the demand with higher priority at present is the cooling demand, i.e., the cooling demand of the user needs to be satisfied in priority, and the hot water heating demand is relatively low. Therefore, the current operation mode of the outdoor unit 100 can be kept as the cooling mode and the hydraulic module 200 is controlled to be closed, so as to facilitate the priority satisfaction of the cooling demand of the user. At this time, the operation state of the multi-split air conditioning system can be understood as the cooling state, and the water tank electric heating device 320 is controlled to be turned on, so as to heat the water in the water tank 300, thereby being able to simultaneously take into account the hot water heating demand of the user, which is conducive to better meeting the diversified use demand of the user and improving the experience of the user.

[0104] It should be noted that when the cooling output of the outdoor unit 100 does not meet the cooling demand, it indicates that the cooling demand of the user needs to be satisfied in priority at present. It can be determined that the cooling mode is the priority operation mode of the outdoor unit 100. Therefore, the current operation mode of the outdoor unit 100 is kept as the cooling mode and the working state of the hydraulic module 200 is controlled to be the closed state, i.e., the outdoor unit 100 continues to cool, so that the indoor temperature can be quickly reduced to the comfortable temperature required by the user.

[0105] In an embodiment, when there are both the cooling demand and the hot water heating demand and the cooling demand has higher priority, during the period when the water tank electric heating device 320 is turned on, the water tank electric heating device 320 can be controlled to operate at a preset maximum power, so as to effectively improve the heating rate, thereby achieving the purpose of quickly heating water.

[0106] In the control method of the above multi-split heat pump system, in step S130, the cooling output condition of the outdoor unit is determined according to the operation time of the compressor, which comprises one of the following:

[0107] When the operation time of the compressor is greater than or equal to the preset operation time, it is determined that the cooling output of the outdoor unit meets the cooling demand.

[0108] If the compressor's running time is less than the preset running time, it is determined that the cooling output of the outdoor unit does not meet the cooling demand.

[0109] In this embodiment, the cooling output status of the outdoor unit 100 can be determined based on the running time of the compressor 110. When the running time of the compressor 110 is greater than or equal to the preset running time, it indicates that the compressor 110 has been running continuously for a certain period of time, and it can be considered that the cooling capacity provided by the compressor 110 meets the cooling capacity required by the user. In this case, it is determined that the cooling output of the outdoor unit 100 meets the cooling demand. When the running time of the compressor 110 is less than the preset running time, it can be considered that the cooling capacity provided by the compressor 110 has not yet met the cooling capacity required by the user. In this case, it is determined that the cooling output of the outdoor unit 100 does not meet the cooling demand. By using the running time of the compressor 110, it is possible to more accurately assess whether the cooling output of the outdoor unit 100 meets the user's cooling demand, which will facilitate the subsequent better identification of higher priority demands and thus improve the intelligent operation of the multi-split heat pump system.

[0110] like Figure 3 As shown, in the control method of the above multi-split heat pump system, before step S130 determines the cooling output status of the outdoor unit based on the compressor's running time, the control method also includes, but is not limited to, steps S210 and S220:

[0111] Step S210: Obtain the outdoor ambient temperature;

[0112] Step S220: Determine the operating temperature range of the outdoor unit for heating based on the outdoor ambient temperature.

[0113] In this embodiment, when the current operating mode of the outdoor unit 100 is cooling mode, the outdoor ambient temperature can be obtained to determine whether the outdoor unit 100 is operating within the heating operating temperature range. When it is determined that the outdoor unit 100 is operating within the heating operating temperature range, it means that the outdoor ambient temperature is within the heating operating temperature range, i.e., there is no high pressure risk for the outdoor unit 100. The cooling output status of the outdoor unit 100 can be determined based on the running time of the compressor 110. This facilitates switching the current operating mode of the outdoor unit 100 to heating mode when it is determined that the cooling output of the outdoor unit 100 meets the cooling demand, preventing the compressor 110 from shutting down and ensuring that the outdoor unit 100 can operate stably in heating mode. This is beneficial to improving the stability and reliability of the multi-split air conditioning system.

[0114] like Figure 4 As shown, in the control method of the above multi-split heat pump system, when the current operating mode is cooling mode, the control method also includes, but is not limited to, step S310:

[0115] Step S310: When the outdoor ambient temperature is greater than the upper limit of the heating operation temperature range, control the outdoor unit to keep it in cooling mode, control the hydraulic module to shut down, and control the water tank electric heating device to turn on.

[0116] In this embodiment, when the current operating mode of the outdoor unit 100 is cooling mode, if the outdoor ambient temperature is greater than the upper limit of the heating operating temperature range, that is, the outdoor ambient temperature exceeds the heating operating temperature range, it indicates that there is a high pressure risk in the outdoor unit 100. At this time, the outdoor unit 100 is not suitable for operating in heating mode. Therefore, the outdoor unit 100 is controlled to maintain cooling mode and the hydraulic module 200 is controlled to be turned off to meet the user's cooling needs. At the same time, the water tank electric heating device 320 is controlled to be turned on to meet the user's hot water heating needs. This allows the multi-split air conditioning system to take into account both cooling and hot water heating needs while ensuring stable operation. It can meet the diverse usage needs of users and ensure the stability and reliability of the multi-split air conditioning system operation.

[0117] In one embodiment, during the operation of the water tank electric heating device 320, the water tank electric heating device 320 can be controlled to operate at a preset maximum power, thereby effectively improving the heating rate and achieving the purpose of quickly producing hot water.

[0118] like Figure 1 As shown, in one embodiment, the hydraulic module 200 includes a refrigerant circulation loop 210, a water circulation loop 220, and a water-side heat exchanger 230. The refrigerant circulation loop 210 is connected to the compressor 110 and the first heat exchange side of the water-side heat exchanger 230, respectively. The water circulation loop 220 is connected to the second heat exchange side of the water-side heat exchanger 230 and the input end of the water tank 300, respectively. The water circulation loop 220 is equipped with a water pump 221, an electronic expansion valve 222, and a water circuit electric heating device 223. The refrigerant circulation loop 210 and the water circulation loop 220 can exchange heat. Specifically, the water pump 221 can transport water in the water circulation loop 220 to the second heat exchange side of the water-side heat exchanger 230, the electronic expansion valve 222 can regulate the water flow rate in the water circulation loop 220, and the water circuit electric heating device 223 can heat the water in the water circulation loop 220 to provide hot water to the water tank 300. It should be noted that when the hydraulic module 200 is in the off state, the refrigerant circulation loop 210 is closed, the water circulation loop 220 is closed, and the refrigerant circulation loop 210 and the water circulation loop 220 do not exchange heat; when the hydraulic module 200 is in the on state, the refrigerant circulation loop 210 is on, the water circulation loop 220 is on, and the refrigerant circulation loop 210 and the water circulation loop 220 can exchange heat normally.

[0119] like Figure 5As shown, in the control method of the above-mentioned multi-split heat pump system, after step S310 controls the water tank electric heating device to turn on, the control method also includes, but is not limited to, step S320:

[0120] Step S320: When the water tank electric heating device is continuously turned on for a longer period than the preset heating time and the current water temperature is lower than the preset target water temperature, control the refrigerant circulation loop to close, and control the water pump, electronic expansion valve, and water circuit electric heating device to turn on.

[0121] In this embodiment, if the water tank electric heating device 320 is continuously turned on for a longer period than the preset heating time and the current water temperature is lower than the preset target water temperature, the antifreeze function of the hydraulic module 200 can be activated. This allows the refrigerant circulation loop 210 to remain closed, while simultaneously turning on the water pump 221, the electronic expansion valve 222, and the water circuit electric heating device 223. This reopens the water circulation loop 220. At this time, no refrigerant flows through the refrigerant circulation loop 210, reducing the risk of heat exchange between the refrigerant and water, which could cause problems in the water circulation loop 220. When the heat of the water decreases, the electric heating device 223 can heat the water in the water circulation loop 220. The heated water can transfer heat to the water tank 300, thereby heating the water in the water tank 300. It can be understood that by restarting the water circulation loop 220, the water in the water circulation loop 220 can continue to flow. At the same time, by using the electric heating device 223 to quickly increase the water flow temperature, the freezing of the hydraulic module 200 due to low temperature can be better reduced, which is conducive to improving the reliability of the multi-split heat pump system.

[0122] It should be noted that the refrigerant circulation loop 210 can be shut off by closing the throttle valve at the inlet of the refrigerant circulation loop 210.

[0123] In one embodiment, during the operation of the water circuit electric heating device 223, the water circuit electric heating device 223 can be controlled to operate at a preset maximum power, thereby effectively improving the heating rate.

[0124] like Figure 6 As shown, in the control method of the above multi-split heat pump system, when the current operating mode is heating mode, the control method also includes, but is not limited to, step S410:

[0125] Step S410: When the compressor's running time is greater than the preset running time and the current water temperature is less than the first preset critical value, control the outdoor unit to continue operating in heating mode, control the indoor unit in heating mode to switch to standby mode, and control the hydraulic module to turn on.

[0126] In the embodiment, when the current operation mode of the outdoor unit 100 is the heating mode, it indicates that there is currently an indoor heating demand, the user demands to increase the indoor temperature, and the user also demands to heat the water in the water tank 300, that is, there is currently a hot water heating demand, and since the operation mode of the outdoor unit 100 corresponding to the indoor heating demand and the operation mode of the outdoor unit 100 corresponding to the hot water heating demand are the same, that is, the outdoor unit 100 can operate in the heating mode, the outdoor unit 100 is controlled to keep operating in the heating mode, and the hydraulic module 200 is controlled to be turned on, so that the hydraulic module 200 can provide hot water for the water tank 300, thereby achieving heating of the water in the water tank 300, and facilitating satisfaction of the user's hot water heating demand. In addition, since the operation time of the compressor 110 is greater than the preset operation time and the current water temperature is less than the first preset critical value, it indicates that the compressor 110 has continuously operated for a certain time, but the current water temperature of the water tank 300 is still low. Since the indoor unit 400 and the hydraulic module 200 share a multi-split heat pump system, the temperature of the water in the hydraulic module 200 will also decrease under the condition that the water tank 300 is at a low water temperature, so that the overall condensing temperature of the multi-split heat pump system will decrease, which will affect the outlet air temperature of the indoor unit 400. In order to reduce the situation that the low water temperature reduces the outlet air temperature of the indoor unit 400, when the operation time of the compressor 110 is greater than the preset operation time, it can be determined that the heating output of the outdoor unit 100 satisfies the indoor heating demand of the user, and then the indoor unit 400 in the heating mode can be controlled to switch to the standby mode. At this time, the hot water heating demand can be prioritized, and the situation that the indoor unit 400 blows cold air can be effectively reduced, which is beneficial to greatly improving the use comfort of the user.

[0127] In the control method of the multi-split heat pump system, when the current operation mode is the heating mode, the control method further includes the following steps:

[0128] When the operation time of the compressor is greater than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit is controlled to keep operating in the heating mode, and the hydraulic module is controlled to be turned on.

[0129] Or, when the operation time of the compressor is less than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, the outdoor unit is controlled to keep operating in the heating mode, and the hydraulic module is controlled to be turned on.

[0130] The first preset critical value is less than the preset target water temperature.

[0131] In the embodiment, when the current operation mode of the outdoor unit 100 is the heating mode, indicating that there is currently an indoor heating demand, when the operation time of the compressor 110 is greater than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, indicating that the compressor 110 has been continuously operated for heating for a certain time and the current water temperature of the water tank 300 will not be too low, that is, there will be no case that the low water temperature pulls down the outlet air temperature of the indoor unit 400, the outdoor unit 100 can be controlled to keep operating in the heating mode, at this time the indoor unit 400 can continue to operate in the heating mode, the indoor heating demand of the user can be met, and the water force module 200 is controlled to be turned on, so that the water force module 200 can provide hot water for the water tank 300, so that the current water temperature in the water tank 300 can reach the preset target water temperature faster, and the hot water heating demand of the user can be met; when the operation time of the compressor 110 is less than the preset operation time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature, although the operation time of the compressor 110 does not reach the preset operation time, the current water temperature of the water tank 300 will not be too low, and the indoor unit 400 does not have the problem of blowing cold wind, the outdoor unit 100 can be controlled to keep operating in the heating mode, at this time the indoor unit 400 can continue to operate in the heating mode, and the indoor heating demand and the indoor heating demand of the user can be met at the same time, which is beneficial to improve the experience of the user.

[0132] In an embodiment, when the current operation mode of the outdoor unit 100 is the heating mode, and the running time of the compressor 110 is less than the preset running time and the current water temperature is less than the first preset critical value, the energy-saving mode and the fast-heating mode can be used to control the operation state of the multi-split heat pump system. For example, in the energy-saving mode, the outdoor unit 100 is controlled to keep running in the heating mode, and at this time, the water module 200 can be temporarily not started, and the water module 200 is controlled to start after the running time of the compressor 110 reaches the preset running time, so as to achieve the purpose of energy saving; in the fast-heating mode, the outdoor unit 100 is controlled to keep running in the heating mode, and the water tank electric heating device 320 is controlled to start to heat the water in the water tank 300, and when the running time of the compressor 110 reaches the preset running time, it can be determined that the heating output of the outdoor unit 100 meets the indoor heating demand of the user, and then the indoor unit 400 in the heating mode can be controlled to switch to the standby mode, and the water module 200 is controlled to start, and the water tank electric heating device 320 keeps the starting state, so as to achieve the purpose of fast heating water. In addition, in the fast-heating mode, when the running time of the compressor 110 is greater than the preset running time and the current water temperature of the water tank 300 does not reach the preset target water temperature, the power of the water tank electric heating device 320 and the water route electric heating device 223 can be gradually increased according to the running time of the compressor 110, so as to greatly improve the heating efficiency. It should be noted that different modes can be selected according to actual application scenarios to control the operation state of the multi-split heat pump system, and the embodiments of the present application do not make specific limitations thereto.

[0133] As shown in the control method of the multi-split heat pump system, Figure 7 the water tank 300 is provided with a water tank electric heating device 320, and the water module 200 includes a water route electric heating device 223. After the water module 200 is controlled to start in step S140 or step S410, the control method further includes but is not limited to steps S510 and S520:

[0134] Step S510: obtaining the heating time of the water module continuously starting;

[0135] Step S520: when the current water temperature is less than the preset target water temperature, controlling the running power of the water tank electric heating device and the water route electric heating device according to the heating time.

[0136] In this embodiment, after the hydraulic module 200 is turned on, if the current water temperature of the water tank 300 is lower than the preset target water temperature, it means that the current water temperature still does not meet the user's hot water heating needs. The operating power of the water tank electric heating device 320 and the water circuit electric heating device 223 can be controlled according to the heating time of the hydraulic module 200. That is, the working state of the water tank electric heating device 320 and the water circuit electric heating device 223 can be controlled according to the timing, thereby improving the working flexibility of the water tank electric heating device 320 and the water circuit electric heating device 223.

[0137] like Figure 8 As shown, in the control method of the above-mentioned multi-split heat pump system, step S520 controls the operating power of the water tank electric heating device and the water circuit electric heating device according to the heating time, including but not limited to steps S610 to S650:

[0138] Step S610: When the heating time is longer than the first preset time, control the water tank electric heating device to operate at the first preset power;

[0139] Step S620: When the heating time is longer than the second preset time, control the water tank electric heating device to operate at the second preset power;

[0140] Step S630: When the heating time is longer than the third preset time, control the water tank electric heating device to operate at the third preset power;

[0141] Step S640: When the heating time is greater than the fourth preset time, control the water tank electric heating device to maintain operation at the third preset power and control the water circuit electric heating device to operate at the fourth preset power;

[0142] Step S650: When the heating time is greater than the fifth preset time, control the water tank electric heating device to maintain operation at the third preset power and control the water circuit electric heating device to operate at the fifth preset power.

[0143] Among them, the first preset power, the second preset power, and the third preset power increase in sequence, the fifth preset power is greater than the fourth preset power, and the first preset time, the second preset time, the third preset time, the fourth preset time, and the fifth preset time increase in sequence.

[0144] In the embodiment, when the heating time is greater than the first preset time and the current water temperature is less than the preset target water temperature, the water tank electric heating device 320 is controlled to operate at the first preset power; when the heating time is greater than the second preset time and the current water temperature is less than the preset target water temperature, the water tank electric heating device 320 is controlled to operate at the second preset power; when the heating time is greater than the third preset time and the current water temperature is less than the preset target water temperature, the water tank electric heating device 320 is controlled to operate at the third preset power, which can be understood as the preset maximum power of the water tank electric heating device 320. It can be understood that when the heating time is less than the fourth preset time and the current water temperature is still less than the preset target water temperature, only the water tank electric heating device 320 can be turned on, the waterway electric heating device 223 is temporarily not turned on, and the power of the water tank electric heating device 320 is gradually increased, so that the energy consumption can be reduced under the premise of meeting the hot water heating demand of the user, so as to achieve the purpose of energy saving; when the heating time is greater than the fourth preset time, the water tank electric heating device 320 is controlled to operate at the third preset power and the waterway electric heating device 223 is controlled to operate at the fourth preset power, and the heating rate can be greatly improved by the auxiliary heating of the waterway electric heating device 223; when the heating time is greater than the fifth preset time, the water tank electric heating device 320 is controlled to operate at the third preset power and the power of the waterway electric heating device 223 is increased, so that the waterway electric heating device 223 operates at the fifth preset power, which can be understood as the preset maximum power of the waterway electric heating device 223; by reasonably controlling the operating power of the water tank electric heating device 320 and the operating power of the waterway electric heating device 223 in time sequence, the hot water heating demand of the user can be met, and the effect of energy saving can be achieved.

[0145] In the control method of the above multi-split heat pump system, the control method further comprises the following steps:

[0146] When the heating time is greater than the sixth preset time and the current water temperature is less than the preset target water temperature, the water force module is controlled to be closed, the water tank electric heating device is controlled to be closed, and the waterway electric heating device is controlled to be closed, and a fault signal is output; wherein the sixth preset time is greater than the fifth preset time.

[0147] In the embodiment, the sixth preset time can be understood as the longest heating time of the water tank. When the heating time of the water force module 200 continuously turned on is greater than the sixth preset time and the current water temperature is less than the preset target water temperature, it indicates that the water force module 200 has been continuously turned on for a long time but the water temperature of the water tank 300 still does not reach the expected water temperature, and it is considered that there is a risk of failure of the multi-split heat pump system, so the water force module 200 is controlled to be closed, the water tank electric heating device 320 is controlled to be closed, and the waterway electric heating device 223 is controlled to be closed, which can ensure the safety and reliability of the multi-split heat pump system, and at the same time output a fault signal to remind the user that there is a risk of failure of the multi-split heat pump system, so as to facilitate timely fault maintenance.

[0148] In the control method of the multi-split heat pump system, the control method further comprises the following steps:

[0149] In the case that the current operation mode of the outdoor unit is the standby mode, the current operation mode of the outdoor unit is switched to the heating mode and the hydraulic module is controlled to be turned on.

[0150] In the present embodiment, when the current operation mode of the outdoor unit 100 is the standby mode, since there is a hot water heating demand at this time, the current operation mode of the outdoor unit 100 can be switched to the heating mode and the hydraulic module 200 is controlled to be turned on, so that the hydraulic module 200 can provide hot water for the water tank 300, thereby achieving heating of the water in the water tank 300, satisfying the hot water heating demand of the user, and being beneficial to improve the use comfort and experience of the user.

[0151] In the control method of the multi-split heat pump system, the step S120 of determining that there is a heating demand according to the current water temperature comprises the following steps:

[0152] If the current water temperature is less than a second preset critical value for a preset low temperature time, it is determined that there is a heating demand, wherein the second preset critical value is obtained by subtracting a preset difference value from a preset target water temperature.

[0153] In the present embodiment, whether the water tank 300 has a heating demand can be determined according to the current water temperature inside the water tank 300. If the current water temperature is less than the second preset critical value for a preset low temperature time, it is determined that there is a heating demand, indicating that the water in the water tank 300 needs to be heated, i.e. there is a hot water heating demand at present. The second preset critical value is obtained by subtracting a preset difference value from a preset target water temperature, and the preset low temperature time is set, so that whether there is a heating demand can be determined more accurately.

[0154] In the control method of the multi-split heat pump system, the control method further comprises the following steps:

[0155] During the period when the hydraulic module is turned on, when the current water temperature is greater than a preset target water temperature, the working state of the hydraulic module is controlled to be adjusted to a closed state.

[0156] In the present embodiment, during the period when the hydraulic module 200 is turned on, since the hydraulic module 200 can provide hot water for the water tank 300, thereby achieving heating of the water in the water tank 300, i.e. the current water temperature inside the water tank 300 can be continuously improved. When the current water temperature of the water tank 300 is greater than a preset target water temperature, it indicates that the current water temperature at this time can satisfy the hot water heating demand of the user, and the working state of the hydraulic module 200 is controlled to be adjusted to a closed state, thereby effectively improving the accuracy of control.

[0157] In an embodiment, when the current water temperature of the water tank 300 is greater than the preset target water temperature, after the working state of the water force module 200 is controlled to be adjusted to the closed state, the current operation mode of the outdoor unit 100 can be controlled according to the actual demand of the user, for example, if the user has a cooling demand, the current operation mode of the outdoor unit 100 can be controlled to be switched to the cooling mode; if the user has an indoor heating demand, the outdoor unit 100 can be controlled to continue to operate in the heating mode; if the user temporarily has no other demand, the current operation mode of the outdoor unit 100 can be controlled to be switched to the standby mode; the embodiment of the application does not make specific limitation on this.

[0158] In the control method of the above multi-split heat pump system, after the step S320 controls the water pump to be opened, the electronic expansion valve to be opened and the water circuit electric heating device to be opened, the control method further includes the following steps:

[0159] When the time during which the water circuit electric heating device is continuously opened is greater than the seventh preset time and the current water temperature is less than the preset target water temperature, the water force module is controlled to be closed and the water tank electric heating device is controlled to be closed, and a fault signal is output.

[0160] In the embodiment, the seventh preset time can be understood as the longest heating time of the water tank. When the time during which the water circuit electric heating device 223 is continuously opened is greater than the seventh preset time and the current water temperature is less than the preset target water temperature, it is indicated that the water circuit electric heating device 223 and the water tank electric heating device 320 have been continuously opened for a long time but the water temperature of the water tank 300 still does not reach the expected water temperature, and it is considered that the multi-split heat pump system has a fault risk. Therefore, the water force module 200 is controlled to be closed, so that the water pump 221, the electronic expansion valve 222 and the water circuit electric heating device 223 in the water force module 200 are all closed, and the water tank electric heating device 320 is controlled to be closed, so as to ensure the safety and reliability of the multi-split heat pump system. At the same time, a fault signal is output to remind the user that the multi-split heat pump system has a fault risk, so as to facilitate timely fault maintenance.

[0161] In an embodiment, the sixth preset time can be the same as or different from the seventh preset time, and the embodiment of the application does not make specific limitation on this.

[0162] In order to more clearly describe the control method of the multi-split heat pump system of the application, an overall embodiment will be further introduced below.

[0163] As shown in Figure 9 and Figure 10 , the control method of the multi-split heat pump system of the application is as follows:

[0164] 1. Determine whether there is a heating requirement: Real-time detection of outdoor ambient temperature (i.e. T4) and the current water temperature inside the water tank (i.e. Tk), when the water tank water temperature continues to drop, determine whether Tk < Tks-ΔT1 and continuous ta time, if so, it means that the current water temperature is less than the second preset critical value (i.e. Tks-ΔT1) and the preset low temperature time (i.e. ta) is continuous, it can be determined that there is a heating requirement, which means that the water in the water tank needs to be heated, that is, there is a hot water heating demand at present, then the current operating mode of the outdoor unit is obtained; The current operating mode includes cooling mode, heating mode and standby mode, Tks is the preset target water temperature, and ΔT1 is the preset difference;

[0165] 2. The current operating mode of the outdoor unit is cooling mode

[0166] (1) The outdoor ambient temperature is in the heating operation temperature range (i.e. T4b < T4 < T4a), that is, the outdoor unit is running in the heating operation temperature range, and then it is further determined whether the running time of the compressor (i.e. tcp) is greater than or equal to the preset running time (i.e. tcp1).

[0167] a. The running time of the compressor is greater than the preset running time, it is determined that the cooling output of the outdoor unit meets the cooling demand, at this time the hot water heating demand of the user can be preferentially met, the outdoor unit is switched to the heating mode, and the hydraulic module is turned on, so that the hydraulic module can provide hot water for the water tank, thereby achieving heating of the water in the water tank. After the first preset time (i.e. tk1), the water tank does not reach the temperature, that is, Tk < Tks, the water tank electric heating device operates at the first preset power (i.e. a%), after the second preset time (i.e. tk2), the water tank does not reach the temperature, the water tank electric heating device operates at the second preset power (i.e. 2a%), after the third preset time (i.e. tk3), the water tank does not reach the temperature, the water tank electric heating device operates at the third preset power (i.e. 3a%), after the fourth preset time (i.e. tk4), the water tank does not reach the temperature, the water tank electric heating device keeps operating at the third preset power (i.e. 3a%), the waterway electric heating device operates at the fourth preset power (i.e. b%), after the fifth preset time (i.e. tk5), the water tank does not reach the temperature, the water tank electric heating device keeps operating at the third preset power (i.e. 3a%), the waterway electric heating device operates at the fifth preset power (i.e. 2b%), after the sixth preset time (i.e. t-tank), the water tank does not reach the temperature, the hydraulic module is closed, the water tank electric heating device is closed, and the waterway electric heating device is closed, and a fault signal is output, if there is a cooling demand, the outdoor unit is switched to the cooling mode; Within 0 to t-tank time, if Tk reaches Tks, the hydraulic module is closed, the outdoor unit can be switched to standby mode or switched to cooling mode if there is a cooling demand.

[0168] b. The running time of the compressor is less than the preset running time, and it is determined that the refrigeration output of the outdoor unit does not meet the refrigeration demand. At this time, the refrigeration demand of the user can be preferentially met, the outdoor unit remains in the refrigeration mode, the hydraulic module is closed, and the water tank electric heating device operates at 3a% power. If the water tank reaches the temperature, i.e., Tk reaches Tks, under the condition that the running time of the compressor is less than the preset running time, the hydraulic module remains closed, and the outdoor unit continues to remain in the refrigeration mode or switches to the standby mode.

[0169] (2) The outdoor environment temperature is greater than the upper limit value of the heating operation temperature range (i.e., T4>T4a), that is, the outdoor environment temperature exceeds the heating operation temperature range, indicating that the outdoor unit has a high-pressure risk. The outdoor unit remains in the refrigeration mode, the hydraulic module is closed, and the water tank electric heating device operates at 3a% power. After the preset heating time (i.e., tk11), the water tank does not reach the temperature, the anti-freezing function of the hydraulic module is turned on, that is, the refrigerant circulation loop of the hydraulic module is closed, the water circulation loop is opened, the waterway electric heating device operates at 2b% power, and after the seventh preset time (i.e., t-tank), the water tank does not reach the temperature, the hydraulic module, the water tank electric heating device, and the waterway electric heating device are closed, and a fault signal is output. If there is a refrigeration demand, the outdoor unit switches to the refrigeration mode. Within 0 to t-tank time, if Tk reaches Tks, the hydraulic module is closed, and the outdoor unit can switch to the standby mode or the refrigeration mode if there is a refrigeration demand.

[0170] 3. The current operation mode of the outdoor unit is the heating mode

[0171] (1) When the running time of the compressor is greater than the preset running time (i.e., tcp>tcp1) and the current water temperature is less than the first preset critical value (i.e., Tk

[0172] (2) When the running time of the compressor is greater than the preset running time (i.e., tcp>tcp1), the current water temperature is greater than the first preset critical value and less than the preset target water temperature (i.e., Twc

[0173] (3) When the running time of the compressor is less than the preset running time (i.e., tcp

[0174] (4) When the running time of the compressor is less than the preset running time (i.e., tcp

[0175] 4、The current running mode of the outdoor unit is standby mode

[0176] The outdoor unit switches to the heating mode, the hydraulic module is turned on, the hydraulic module can provide hot water for the water tank, so that the water in the water tank can be heated, and the hot water heating demand of the user can be met.

[0177] Specifically, the recommended value of T4b is -10℃, and the range is -20~20℃; the recommended value of T4a is 48℃, and the range is 24~60℃; the recommended value of tcp1 is 30min, and the range is 5~45min; wherein, tk1=tcp1+15min, the time relationship of tk1, tk2…tk5 is tk(n+1)-tkn=15min, and the range is 5~20min; the recommended value of t-tank is 120min, and the range is 90min~240min; the value range of tk11 is 5~20min; 3a% is the preset maximum power of the water tank electric heating device, which can be understood as full power output; 2b% is the preset maximum power of the waterway electric heating device; the recommended value of Twc is 42℃, and the range is 38~49℃.

[0178] The control method of the multi-split heat pump system provided in the embodiment can select the demand to be met preferentially according to different situations when the refrigeration demand and the hot water heating demand exist at the same time, can take into account the hot water heating demand and the refrigeration demand, is beneficial to better meet the diversified use demand of the user, and can use the auxiliary heating device when necessary, which can play an energy-saving role. If the indoor heating demand and the hot water heating demand exist at the same time, the indoor unit 400 can be kept standby when the compressor 110 is long-time running and the low water temperature still exists, so that the situation that the indoor unit 400 blows out cold air can be avoided, and the use comfort of the user can be greatly improved; if the low water temperature does not exist, the outdoor unit 100 can keep running in the heating mode, and the hydraulic module 200 is turned on, so that the indoor heating demand and the hot water heating demand of the user can be met at the same time; when only the hot water heating demand exists, the outdoor unit 100 can run in the heating mode, and the hydraulic module 200 is turned on, so that the hot water heating demand of the user can be met; the embodiment can control the running state of the multi-split heat pump system according to the actual demand of the user when the outdoor unit 100 is in different running modes, can have the functions of air conditioning and providing domestic hot water at the same time, meets the diversified use demand of the user, is suitable for various complex and changeable scenes, in addition, by reasonably controlling the opening of the water tank electric heating device 320, the waterway electric heating device 223 and the hydraulic module 200, the stability and reliability of the multi-split heat pump system can be ensured, and an energy-saving role can be played.

[0179] As Figure 11As shown, a second aspect of the present invention provides an operation control device 1100, including a memory 1110, a processor 1120, and a computer program stored in the memory 1110 and executable on the processor 1120; the processor 1120 and the memory 1110 can be connected via a bus or other means. Figure 11 The example shown is a bus connection, where processor 1120 executes the computer program described above to implement the control method of the multi-unit heat pump system as described in the first aspect embodiment above, for example, executing the above-described... Figure 2 Method steps S110 to S140 in the text Figure 3 Method steps S210 and S220 in the text Figure 4 Method steps S310, Figure 5 Method steps S320, Figure 6 Method steps S410, Figure 7 Method steps S510 and S520 in the text Figure 8 Method steps S610 to S650 in the text Figure 9 Methods and steps, and Figure 10 The method and steps are as follows: By obtaining the current water temperature inside the water tank 300, if a heating demand is determined based on the current water temperature, it means that the water in the water tank 300 needs to be heated, i.e., there is a current hot water heating demand. Then, the current operating mode of the outdoor unit 100 is obtained. If the current operating mode of the outdoor unit 100 is cooling mode, it means that there is a current cooling demand. The cooling output status of the outdoor unit 100 can be judged based on the running time of the compressor 110 to determine whether the cooling output of the outdoor unit 100 meets the user's cooling demand. If it is determined that the cooling output of the outdoor unit 100 meets the cooling demand, it means that the current higher priority demand is the hot water heating demand. The current operating mode of the outdoor unit 100 can be switched to heating mode and the hydraulic module 200 can be turned on to prioritize meeting the user's hot water heating demand. By determining the higher priority demand based on the cooling output status of the outdoor unit 100 when there are both hot water heating and cooling demands, the current operating mode of the outdoor unit 100 can be flexibly adjusted to take into account both hot water heating and cooling demands, better meet the diverse usage needs of users, and greatly improve the user's comfort and experience.

[0180] A third aspect of the present invention provides a multi-split heat pump system, including the operation control device as described in the second aspect embodiment above. By acquiring the current water temperature inside the water tank 300, if a heating demand is determined based on the current water temperature, it indicates that the water in the water tank 300 needs to be heated, meaning there is a current demand for hot water heating. The current operating mode of the outdoor unit 100 is then acquired. If the current operating mode of the outdoor unit 100 is cooling mode, it indicates a current demand for cooling. The cooling output of the outdoor unit 100 can be determined based on the running time of the compressor 110 to determine whether the cooling output of the outdoor unit 100 meets the user's cooling needs. If the cooling output of the outdoor unit 100 meets the cooling demand, the higher priority demand is hot water heating. The current operating mode of the outdoor unit 100 can be switched to heating mode, and the hydraulic module 200 can be activated to prioritize meeting the user's hot water heating demand. By determining the higher priority demand based on the cooling output of the outdoor unit 100 when both hot water heating and cooling demands exist simultaneously, the current operating mode of the outdoor unit 100 can be flexibly adjusted. This allows for the consideration of both hot water heating and cooling demands, better meeting the diverse usage needs of users and significantly improving user comfort and experience.

[0181] A fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions that can be used to cause a computer to perform the control method of the heat pump system as described in the first aspect embodiment above, for example, to perform the above-described... Figure 2 Method steps S110 to S140 in the text Figure 3 Method steps S210 and S220 in the text Figure 4 Method steps S310, Figure 5 Method steps S320, Figure 6 Method steps S410, Figure 7 Method steps S510 and S520 in the text Figure 8 Method steps S610 to S650 in the text Figure 9 Methods and steps, and Figure 10The method steps. By acquiring the current water temperature inside the water tank 300, when it is determined according to the current water temperature that there is a heating demand, indicating that the water inside the water tank 300 needs to be heated, that is, there is currently a hot water heating demand, the current operating mode of the outdoor unit 100 is acquired, and when the current operating mode of the outdoor unit 100 is the cooling mode, indicating that there is currently a cooling demand, the cooling output condition of the outdoor unit 100 can be determined according to the operating time of the compressor 110, so as to determine whether the cooling output of the outdoor unit 100 meets the cooling demand of the user, and when it is determined that the cooling output of the outdoor unit 100 meets the cooling demand, indicating that the demand with higher priority is the hot water heating demand, the current operating mode of the outdoor unit 100 can be switched to the heating mode and the hydraulic module 200 is controlled to be turned on, so as to preferentially meet the hot water heating demand of the user. By determining the demand with higher priority according to the cooling output condition of the outdoor unit 100 in the case where there is a hot water heating demand and a cooling demand at the same time, the current operating mode of the outdoor unit 100 can be flexibly adjusted, the hot water heating demand and the cooling demand can be considered, the diversified use demand of the user can be better met, and the use comfort and experience of the user can be greatly improved.

[0182] Those of ordinary skill in the art can understand that all or some of the steps in the method disclosed above can be implemented as software, firmware, hardware and appropriate combinations thereof. Some or all of the 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 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 transitory media. As known to those of ordinary skill 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 technology, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those of ordinary skill in the art, communication media generally 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.

[0183] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A control method of a multi VRF heat pump system, characterized by, The multi-split heat pump system comprises an outdoor unit, a hydraulic module, a water tank and at least one indoor unit, the outdoor unit is connected with the hydraulic module and the indoor unit respectively, an output end of the hydraulic module is connected to the water tank, the hydraulic module is used to provide hot water for the water tank, and the control method comprises: obtaining the current water temperature inside the water tank; when it is determined according to the current water temperature that there is a heating demand, obtaining the current operating mode of the outdoor unit; in the case where the current operating mode is a cooling mode, obtaining an outdoor environment temperature; determining that the outdoor unit operates in a heating operating temperature range according to the outdoor environment temperature; determining the cooling output condition of the outdoor unit according to the operating time of the compressor, wherein the cooling output condition comprises that the cooling output meets the cooling demand and the cooling output does not meet the cooling demand; when it is determined that the cooling output of the outdoor unit meets the cooling demand, switching the current operating mode of the outdoor unit to a heating mode and controlling the hydraulic module to be turned on; wherein the determination of the heating demand according to the current water temperature comprises: if the current water temperature is less than a second preset critical value and lasts for a preset low-temperature time, it is determined that there is a heating demand, wherein the second preset critical value is obtained by subtracting a preset difference value from a preset target water temperature.

2. The control method according to claim 1, characterized by, The water tank is provided with a water tank electric heating device, and in the case where the current operating mode is a cooling mode, the control method further comprises: when it is determined that the cooling output of the outdoor unit does not meet the cooling demand, keeping the current operating mode of the outdoor unit as the cooling mode and controlling the hydraulic module to be turned off, and controlling the water tank electric heating device to be turned on.

3. The control method according to claim 1, characterized by, The determination of the cooling output condition of the outdoor unit according to the operating time of the compressor comprises one of: when the operating time of the compressor is greater than or equal to a preset operating time, it is determined that the cooling output of the outdoor unit meets the cooling demand; when the operating time of the compressor is less than the preset operating time, it is determined that the cooling output of the outdoor unit does not meet the cooling demand.

4. The control method according to claim 1, characterized by, In the case where the current operating mode is a cooling mode, the control method further comprises: when the outdoor environment temperature is greater than the upper limit value of the heating operating temperature range, controlling the outdoor unit to keep operating in the cooling mode and controlling the hydraulic module to be turned off, and controlling the water tank electric heating device to be turned on.

5. The control method according to claim 4, characterized by The hydraulic module comprises a refrigerant circulation loop, a water circulation loop and a water-side heat exchanger, the refrigerant circulation loop is connected with a compressor and a first heat exchange side of the water-side heat exchanger respectively, the water circulation loop is connected with a second heat exchange side of the water-side heat exchanger and an input end of the water tank respectively, the water circulation loop is provided with a water pump, an electronic expansion valve and a water route electric heating device, and after the water tank electric heating device is controlled to be turned on, the control method further comprises: when the time during which the water tank electric heating device is continuously turned on is greater than a preset heating time and the current water temperature is less than a preset target water temperature, controlling the refrigerant circulation loop to be turned off, and controlling the water pump, the electronic expansion valve and the water route electric heating device to be turned on.

6. The control method according to claim 1, characterized by In a case that the current operation mode is the heating mode, the control method further comprises: controlling the outdoor unit to keep operating in the heating mode, controlling the indoor unit in the heating mode to switch to the standby mode, and controlling the hydraulic module to start, when the running time of the compressor is greater than the preset running time and the current water temperature is less than the first preset critical value.

7. The control method according to claim 1, characterized by, In a case that the current operation mode is the heating mode, the control method further comprises: controlling the outdoor unit to keep operating in the heating mode and controlling the hydraulic module to start, when the running time of the compressor is greater than the preset running time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature; or controlling the outdoor unit to keep operating in the heating mode and controlling the hydraulic module to start, when the running time of the compressor is less than the preset running time, the current water temperature is greater than the first preset critical value and less than the preset target water temperature; wherein the first preset critical value is less than the preset target water temperature.

8. The control method according to claim 1 or 6, characterized by, The water tank is provided with a water tank electric heating device, and the hydraulic module comprises a waterway electric heating device, and after the hydraulic module is controlled to start, the control method further comprises: obtaining a heating time of the hydraulic module continuously starting; controlling the running power of the water tank electric heating device and the waterway electric heating device according to the heating time, when the current water temperature is less than the preset target water temperature.

9. The control method according to claim 8, characterized by, The control of the running power of the water tank electric heating device and the waterway electric heating device according to the heating time comprises: controlling the water tank electric heating device to operate at a first preset power, when the heating time is greater than a first preset time; controlling the water tank electric heating device to operate at a second preset power, when the heating time is greater than a second preset time; controlling the water tank electric heating device to operate at a third preset power, when the heating time is greater than a third preset time; controlling the water tank electric heating device to keep operating at the third preset power and controlling the waterway electric heating device to operate at a fourth preset power, when the heating time is greater than a fourth preset time; controlling the water tank electric heating device to keep operating at the third preset power and controlling the waterway electric heating device to operate at a fifth preset power, when the heating time is greater than a fifth preset time; wherein the first preset power, the second preset power and the third preset power increase in turn, the fifth preset power is greater than the fourth preset power, and the first preset time, the second preset time, the third preset time, the fourth preset time and the fifth preset time increase in turn.

10. The control method according to claim 9, characterized by, The control method further comprises: controlling the hydraulic module to stop, the water tank electric heating device to stop and the waterway electric heating device to stop, and outputting a fault signal, when the heating time is greater than a sixth preset time and the current water temperature is less than the preset target water temperature; wherein the sixth preset time is greater than the fifth preset time.

11. The control method according to claim 1, characterized by, The control method further comprises: in a case that the current operation mode is the standby mode, switching the current operation mode of the outdoor unit to the heating mode and controlling the hydraulic module to start.

12. The control method according to claim 1 or 6 or 7 or 11, characterized by, The control method further comprises: during the opening of the hydraulic module, when the current water temperature is greater than a preset target water temperature, controlling the working state of the hydraulic module to be adjusted to a closed state.

13. The control method according to claim 5, characterized by, after the control of the opening of the water pump, the opening of the electronic expansion valve and the opening of the water circuit electric heating device, the control method further comprises: when the time of the continuous opening of the water circuit electric heating device is greater than a seventh preset time and the current water temperature is less than the preset target water temperature, controlling the hydraulic module to be closed and the water tank electric heating device to be closed, and outputting a fault signal.

14. A running control device characterized by comprising: a computer program product, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the control method according to any one of claims 1 to 13.

15. A multi-split heat pump system, comprising: an operation control device according to claim 14.

16. A computer readable storage medium characterized by: The computer readable storage medium stores computer executable instructions for causing a computer to execute the control method according to any one of claims 1 to 13.

Images