Control method of heat pump system, heat pump system and storage medium

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a refrigerant main path and a refrigerant branch path connected with the refrigerant main path, the refrigerant main path comprises an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger, the refrigerant main path further comprises a compressor connected with the indoor heat exchanger and the outdoor heat exchanger, and the refrigerant branch path comprises an energy storage device. The method comprises the steps that the heat pump system is controlled to operate in a preset mode, the outdoor environment temperature is obtained, in the preset mode, an indoor heat exchanger and an outdoor heat exchanger are in the same heat exchange state, and an energy storage device is in an energy storage state; determining a first target control valve and a second target control valve in the outdoor control valve and the indoor control valve according to the outdoor environment temperature; and the first target control valve is controlled to operate according to the exhaust temperature of the compressor, and the second target control valve is controlled to operate at a preset opening. The invention aims to improve the indoor heat exchange effect and energy storage effect of the heat pump system.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a control method for a heat pump system, a heat pump system and a storage medium. Background Art

[0002] In addition to using energy to regulate the indoor environment, the heat pump system also has energy storage devices such as water tanks to provide the required energy for other needs. In the process of storing refrigerant energy in the energy storage device, the indoor heat exchanger and the outdoor heat exchanger can be in the same heat exchange state. The opening of the expansion valves at the refrigerant inlet of the two heat exchangers is generally independently regulated according to their own different control logics based on the exhaust temperature of the compressor. However, this method will cause the two control valves to operate uncoordinatedly. For example, the indoor control valve will be closed to the minimum, while the outdoor control valve will be opened to the maximum, resulting in uneven distribution of refrigerant in the indoor and outdoor heat exchangers, reducing the heat exchange effect and energy storage effect of the heat pump system on the indoor. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method of a heat pump system, a heat pump system and a storage medium, aiming to improve the indoor heat exchange effect and energy storage effect of the heat pump system.

[0004] To achieve the above object, the present invention provides a control method for a heat pump system, the heat pump system comprising a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprising an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger, the refrigerant main circuit further comprising a compressor respectively connected to the indoor heat exchanger and the outdoor heat exchanger, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0005] Controlling the heat pump system to operate in a preset mode to obtain an outdoor ambient temperature, wherein the indoor heat exchanger and the outdoor heat exchanger are in the same heat exchange state in the preset mode, and the energy storage device is in an energy storage state;

[0006] Determine a first target control valve and a second target control valve in the outdoor control valve and the indoor control valve according to the outdoor ambient temperature;

[0007] The first target control valve is controlled to operate according to the exhaust gas temperature of the compressor, and the second target control valve is controlled to operate at a preset opening.

[0008] Optionally, in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in an evaporating state, and the energy storage device is in a heat storage state, and the step of determining the first target control valve and the second target control valve of the outdoor control valve and the indoor control valve according to the outdoor ambient temperature includes:

[0009] When the outdoor ambient temperature is greater than or equal to a first preset temperature, determining the indoor control valve as the first target control valve, and determining the outdoor control valve as the second target control valve;

[0010] When the outdoor ambient temperature is lower than a second preset temperature, determining the outdoor control valve as the first target control valve, and determining the indoor control valve as the second target control valve;

[0011] Wherein, the second preset temperature is less than or equal to the first preset temperature.

[0012] Optionally, after the step of controlling the first target control valve to operate according to the target exhaust temperature and controlling the second target control valve to operate at a preset opening, the method further includes: returning to execute the step of controlling the heat pump system to operate in a preset mode and acquiring an outdoor ambient temperature;

[0013] The step of determining the first target control valve and the second target control valve of the outdoor control valve and the indoor control valve according to the outdoor ambient temperature further includes:

[0014] When the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, maintaining the current first target control valve and the second target control valve unchanged;

[0015] Wherein, the second preset temperature is lower than the first preset temperature.

[0016] Optionally, after the step of obtaining the outdoor ambient temperature, the method further includes:

[0017] determining a target exhaust temperature of the compressor according to the outdoor ambient temperature;

[0018] The step of controlling the operation of the first target control valve according to the exhaust temperature of the compressor comprises:

[0019] The first target control valve is controlled to operate according to the exhaust gas temperature of the compressor and the target exhaust gas temperature.

[0020] Optionally, in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in an evaporating state, and the energy storage device is in a heat storage state, and the step of determining the target exhaust temperature of the compressor according to the outdoor ambient temperature includes:

[0021] When the outdoor ambient temperature is greater than or equal to a first preset temperature, determining a first target exhaust temperature as the target exhaust temperature;

[0022] When the outdoor ambient temperature is lower than a second preset temperature, determining a second target exhaust temperature as the target exhaust temperature;

[0023] The second preset temperature is less than or equal to the first preset temperature, the first target exhaust temperature is determined according to a first state parameter indicating a current heat exchange state of the indoor heat exchanger, and the second target exhaust temperature is determined according to a second state parameter indicating a current heat exchange state of the outdoor heat exchanger.

[0024] Optionally, the first state parameter includes the operating frequency of the compressor and the outdoor ambient temperature, and the second state parameter includes the operating frequency of the compressor, the first temperature of the indoor heat exchanger, and the second temperature of the outdoor heat exchanger.

[0025] Optionally, the heat pump system includes more than one indoor unit, the indoor unit includes the indoor control valve and the indoor heat exchanger, and the control method of the heat pump system further includes:

[0026] Acquiring the indoor heat exchanger temperature of the indoor unit with energy demand in the preset mode;

[0027] The first temperature is determined according to all the indoor heat exchanger temperatures.

[0028] Optionally, after the step of controlling the first target control valve to operate according to the target exhaust temperature and controlling the second target control valve to operate at a preset opening, the method further includes: returning to execute the step of controlling the heat pump system to operate in a preset mode and acquiring an outdoor ambient temperature;

[0029] The step of determining the target exhaust temperature of the compressor according to the outdoor ambient temperature further includes:

[0030] When the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, maintaining the current target exhaust temperature unchanged;

[0031] Wherein, the second preset temperature is lower than the first preset temperature.

[0032] Optionally, the step of controlling the operation of the first target control valve according to the exhaust temperature of the compressor and the target exhaust temperature includes:

[0033] Determining a temperature difference between the exhaust temperature and a target exhaust temperature;

[0034] When the temperature difference is less than a first preset temperature difference, controlling the first target control valve to reduce its opening degree;

[0035] When the temperature difference is greater than a second preset temperature difference, controlling the first target control valve to increase its opening;

[0036] When the temperature difference is greater than or equal to the first preset temperature difference, and the temperature difference is less than or equal to the second preset temperature difference, controlling the first target control valve to maintain the current opening;

[0037] Wherein, the first preset temperature difference is smaller than the second preset temperature difference.

[0038] Optionally, the heat pump system includes more than one indoor unit, the indoor unit includes the indoor control valve and the indoor heat exchanger, and the step of controlling the second target control valve to operate at a preset opening includes:

[0039] When the second target control valve is the outdoor control valve, controlling the outdoor control valve to operate at a first preset opening;

[0040] When the second target control valve is the indoor control valve, controlling the indoor control valve to operate at a second preset opening;

[0041] Wherein, the first preset opening is greater than the second preset opening.

[0042] Optionally, the refrigerant main circuit further includes a reversing component, the indoor unit, the outdoor heat exchanger, the return air port of the compressor and the exhaust port of the compressor are all connected to the reversing component, one end of the refrigerant branch is connected to the exhaust port of the compressor, and the pipeline between the outdoor control valve and the indoor control valve is connected to the other end of the refrigerant branch. The step of controlling the heat pump system to run in a preset mode includes:

[0043] The reversing assembly is controlled to operate so that both the indoor unit and the outdoor heat exchanger are connected to the return air port.

[0044] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system includes a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger, the refrigerant main circuit also includes a compressor connected to the indoor heat exchanger and the outdoor heat exchanger respectively, and the refrigerant branch circuit includes an energy storage device;

[0045] The indoor control valve and the outdoor control valve are both connected to the control device, which includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, the steps of the control method for the heat pump system as described in any one of the above items are implemented.

[0046] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the steps of the control method of the heat pump system as described in any of the above items are implemented.

[0047] A control method for a heat pump system proposed in the present invention is based on a heat pump system provided with an energy storage device, a compressor, an indoor heat exchanger, an outdoor heat exchanger, an outdoor control valve and an indoor control valve and other components. In a preset mode of the heat pump system, the indoor and outdoor heat exchangers are in the same heat exchange state and the energy storage device is in an energy storage state. In this process, a target exhaust temperature required for the operation of the heat pump system is determined based on the outdoor ambient temperature, and a target control valve that needs to be controlled according to the target exhaust temperature is determined based on the outdoor ambient temperature. The opening of the target control valve in the indoor control valve and the outdoor control valve is adjusted according to the exhaust temperature of the compressor, while the other control valve is controlled to operate with a preset opening, so as to avoid the opening of the control valve being too large or too small when both the indoor and outdoor control valves are independently controlled according to the exhaust temperature, thereby avoiding uneven distribution of refrigerant between the indoor and outdoor heat exchangers, and effectively improving the heat exchange effect and energy storage effect of the heat pump system on the indoor room. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the refrigerant system structure of an embodiment of a heat pump system of the present invention

[0049] Figure 2 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0050] Figure 3 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0051] Figure 4 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0052] Figure 5 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0053] Figure 6 This is a flow chart of another embodiment of a control method for a heat pump system of the present invention.

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0056] An embodiment of the present invention provides a heat pump system.

[0057] In the embodiment of the present invention, refer to Figure 1 and Figure 2 The heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, an outdoor control valve 4 and a reversing component 5, and the refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing component 5, the compressor 1, the outdoor control valve 4 and the first control valve 8 are all connected to the control device 100. The heat pump system also includes an outdoor indoor unit, and the outdoor unit includes an outdoor heat exchanger 3 and an outdoor fan corresponding to the outdoor heat exchanger 3. The compressor 1 can also be built into the outdoor unit. The outdoor control valve 4 and the first control valve 8 can both be electronic expansion valves.

[0058] In this embodiment, the energy storage device 7 includes a water tank or a water heater, and an external water-using device can be connected to the water tank to use the water with energy stored in the energy storage device 7. In other embodiments, the energy storage device 7 may also include other types of devices with energy storage functions. When the refrigerant in the refrigerant branch flows through the energy storage device 7, it can exchange heat with the energy storage material therein, and the energy storage material can absorb and store the energy flowing through the refrigerant.

[0059] In an implementation of this embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor 1, and the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the other end of the refrigerant branch.

[0060] In another implementation of this embodiment, the heat pump system may also be provided with a flow direction regulating member, the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch, the return air port of the compressor 1, the exhaust port of the compressor 1 and the first end of the refrigerant branch are all connected to the flow direction regulating member, and the refrigerant branch is switched between being connected to the return air port of the compressor 1 and being connected to the exhaust port of the compressor 1 through the flow direction regulating member. The refrigerant branch is connected to the exhaust port of the compressor 1 through one end of the refrigerant branch.

[0061] In this embodiment, the number of indoor units is more than one, and more than one indoor units can be connected in parallel. In other embodiments, the number of indoor units can also be one.

[0062] The indoor unit includes an indoor heat exchanger 21 and an indoor control valve 22 connected in series with the indoor heat exchanger 21. The indoor control valve 22 is connected to the control device 100. The control device 100 can be used to control the flow rate of the refrigerant flowing through the indoor heat exchanger 21. The indoor control valve 22 can be an electronic expansion valve.

[0063] The indoor unit, the outdoor control valve 4 and the outdoor heat exchanger 3 are connected in sequence, and the pipeline between the outdoor control valve 4 and the indoor unit is connected to one end of the refrigerant branch. The indoor unit, the outdoor heat exchanger 3, the exhaust port of the compressor 1 and the return air port of the compressor 1 are all connected to the reversing component 5. The reversing component 5 can be used to switch the connection state between the indoor unit and the outdoor heat exchanger 3 and the exhaust port of the compressor 1 and the return air port of the compressor 1.

[0064] In this embodiment, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The exhaust port of the compressor 1, the return air port of the compressor 1, and the indoor unit are respectively connected to different valve ports of the first reversing valve 51, and the exhaust port of the compressor 1, the return air port of the compressor 1, and the outdoor heat exchanger 3 are respectively connected to different valve ports of the second reversing valve 52. In one implementation of this embodiment, the first reversing valve 51 is a first four-way valve, and the second reversing valve 52 is a second four-way valve. In another implementation of this embodiment, the first reversing valve 51 is a first three-way valve, and the second reversing valve 52 is a second three-way valve.

[0065] The first reversing valve 51 has a first valve position and a second valve position. When the first reversing valve 51 is in the first valve position, the return air port of the compressor 1 is connected to the indoor heat exchanger 21, and the exhaust port of the compressor 1 is blocked from the indoor heat exchanger 21. When the first reversing valve 51 is in the second valve position, the return air port of the compressor 1 is blocked from the indoor heat exchanger 21, and the exhaust port of the compressor 1 is connected to the indoor heat exchanger 21.

[0066] The second reversing valve 52 has a third valve position and a fourth valve position. When the second reversing valve 52 is in the third valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 3; when the second reversing valve 52 is in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 3, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0067] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown), and the reversing assembly 5 (switching valve) may be used to switch the connection state between the energy storage device 7 and the exhaust port of the compressor 1 and the return port of the compressor 1. The switching valve may be a three-way valve or a four-way valve, and the switching valve includes a first switching state and a second switching state; when the switching valve is in the first switching state, the return port of the compressor 1 is connected to the energy storage device 7; when the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0068] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8 and the indoor control valve 22, the operation modes of the heat pump system include but are not limited to the following modes:

[0069] In the first mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the indoor control valve 22 is closed, the first control valve 8 is opened, the refrigerant branch is connected to the exhaust port of the compressor 1 (when the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state), all the refrigerant discharged from the compressor 1 flows into the refrigerant branch, and the heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7, and the refrigerant flowing out of the refrigerant branch flows through the outdoor control valve 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. In the first mode, the indoor heat exchanger 21 stops heat exchange, the outdoor heat exchanger 3 is in an evaporating state, the energy storage device 7 is in a condensing state, and all heat is used for heat storage in the energy storage device 7. In the first mode, the energy storage device 7 can store heat separately.

[0070] In the second mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is opened, the indoor control valve 22 is opened, the refrigerant branch is connected to the exhaust port of the compressor 1 (when the reversing component 5 includes a switching valve, the switching valve is in the second switching state), a part of the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3 and the outdoor control valve 4 in sequence, and another part of the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the outdoor control valve 4 and flows into the indoor unit for evaporation and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 21 is in an evaporating state, and the outdoor heat exchanger 3 is in a condensing state. In the second mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the second mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the second mode, the heat absorbed by the outdoor heat exchanger 3 from the environment can be stored in the energy storage device 7. In the second mode, the indoor environment can be cooled while the energy storage device 7 stores heat or the compressor 1 oil in the refrigerant branch can be returned to the compressor 1 while the energy storage device 7 stores heat.

[0071] In the third mode, refer to Figure 1, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is opened, the indoor control valve 22 operates in throttling, the refrigerant branch is connected to the exhaust port of the compressor 1 (when the reversing component 5 includes a switching valve, the switching valve is in the second switching state), all the refrigerant discharged from the compressor 1 flows into the refrigerant branch, and the heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7, a part of the refrigerant flowing out of the refrigerant branch flows through the outdoor control valve 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1, and another part of the refrigerant flowing out of the refrigerant branch flows through the indoor control valve 22 and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the third mode, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are both in the evaporation state. In the third mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the third mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the third mode, the heat absorbed by the indoor heat exchanger 21 and the outdoor heat exchanger 3 from their environment can be stored in the energy storage device 7. In the third mode, the indoor environment can be cooled while the energy storage device 7 stores heat.

[0072] In the fourth mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is closed, and the indoor control valve 22 is opened. The refrigerant branch is connected to the exhaust port of the compressor 1 (when the reversing component 5 includes a switching valve, the switching valve is in the second switching state), and the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3, the outdoor control valve 4, the indoor control valve 22, and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the fourth mode, the indoor heat exchanger 21 is in an evaporating state and the outdoor heat exchanger 3 is in a condensing state. In the fourth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the fourth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fourth mode, the indoor environment can be cooled while the energy storage device 7 stops storing heat.

[0073] In other embodiments, the reversing assembly 5 may also include a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are respectively connected to different valve ports of the third four-way valve.

[0074] Further, see Figure 1 to Figure 2 The heat pump system further includes a temperature sensor 01 , which can be disposed on the exhaust side of the compressor 1 to detect the exhaust pressure of the compressor. The temperature sensor 01 is connected to the control device 100 .

[0075] Further, see Figure 2The heat pump system further includes an environment detection module 02, which is connected to the control device 100. The environment detection module 02 can be arranged in an outdoor environment to detect the outdoor environment temperature.

[0076] In the embodiment of the present invention, refer to Figure 2 The control device of the heat pump system includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0077] Those skilled in the art will understand that Figure 2 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0078] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0079] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002, and execute the relevant step operations of the control method of the heat pump system in the following embodiment.

[0080] An embodiment of the present invention further provides a control method for a heat pump system, which is applied to the above-mentioned heat pump system.

[0081] Reference Figure 3 , an embodiment of a control method of a heat pump system of the present application is proposed. In this embodiment, the control method of the heat pump system includes:

[0082] Step S10, controlling the heat pump system to run in a preset mode to obtain the outdoor ambient temperature, wherein the indoor heat exchanger and the outdoor heat exchanger are in the same heat exchange state in the preset mode, and the energy storage device is in an energy storage state;

[0083] In this embodiment, in the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporating state, and the energy storage device is in a condensing state to store heat. In other embodiments, in the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in a condensing state, and the energy storage device is in an evaporating state to release heat.

[0084] The outdoor ambient temperature can be specifically detected by the above-mentioned environment detection module.

[0085] Step S20, determining a first target control valve and a second target control valve of the outdoor control valve and the indoor control valve according to the outdoor ambient temperature;

[0086] One of the outdoor control valve and the indoor control valve is determined as the first target control valve according to the outdoor ambient temperature, and the other of the outdoor control valve and the indoor control valve is determined as the second target control valve according to the outdoor ambient temperature.

[0087] Different outdoor ambient temperatures correspond to different first target control valves and second target control valves.

[0088] In an implementation of this embodiment, the temperature range in which the outdoor ambient temperature is located may be determined, and the first target control valve and the second target control valve may be determined according to the temperature range.

[0089] In another implementation of this embodiment, the magnitude relationship between the outdoor ambient temperature and the preset temperature value may be determined, and the first target control valve and the second target control valve may be determined based on the magnitude relationship.

[0090] Step S30, controlling the first target control valve to operate according to the exhaust temperature of the compressor, and controlling the second target control valve to operate at a preset opening.

[0091] In one implementation of this embodiment, the operation of the first control valve can be controlled according to the exhaust temperature and the target exhaust temperature corresponding to the first target control valve. The operation of the first control valve is controlled according to the magnitude relationship or quantitative relationship value between the exhaust temperature and the target exhaust temperature, so that the actual exhaust temperature of the compressor reaches the target exhaust temperature. Among them, different first target control valves correspond to different target exhaust temperatures, and the target exhaust temperature here can be a preset fixed temperature or a parameter determined according to the actual operating state parameters of the heat pump system.

[0092] In another implementation of this embodiment, the target opening of the first target control valve may be determined according to the exhaust temperature interval, and the first target control valve may be controlled to operate at the target opening.

[0093] In one implementation of this embodiment, different second target control valves correspond to different preset openings. When the second target control valve is an indoor control valve, the indoor control valve is controlled to operate at a first preset opening; when the second target control valve is an outdoor control valve, the outdoor control valve is controlled to operate at a second preset opening.

[0094] A control method for a heat pump system is proposed in an embodiment of the present invention. In a preset mode, indoor and outdoor heat exchangers are in the same heat exchange state, and an energy storage device is in an energy storage state. In this process, a target exhaust temperature required for the operation of the heat pump system is determined based on the outdoor ambient temperature, and a target control valve that needs to be controlled according to the target exhaust temperature is determined based on the outdoor ambient temperature. The opening of the target control valve in the indoor control valve and the outdoor control valve is adjusted according to the exhaust temperature of the compressor, while the other control valve is controlled to operate with a preset opening, so as to avoid the opening of the control valve being too large or too small when both indoor and outdoor control valves are independently controlled according to the exhaust temperature, thereby avoiding uneven distribution of refrigerant between indoor and outdoor heat exchangers, and effectively improving the heat exchange effect and energy storage effect of the heat pump system on the indoor room.

[0095] Furthermore, in this embodiment, the refrigerant main circuit also includes a reversing component, the indoor unit, the outdoor heat exchanger, the return air port of the compressor and the exhaust port of the compressor are all connected to the reversing component, one end of the refrigerant branch is connected to the exhaust port of the compressor, and the pipeline between the outdoor control valve and the indoor control valve is connected to the other end of the refrigerant branch. The step of controlling the heat pump system to operate in a preset mode includes: controlling the operation of the reversing component so that the indoor unit and the outdoor heat exchanger are both connected to the return air port.

[0096] In this embodiment, the reversing assembly includes the first reversing valve and the second reversing valve. The preset mode is the third mode, the indoor fan is in the on state, the indoor heat exchanger and the outdoor heat exchanger are both in the evaporation state, the energy storage device is in the heat storage state, the refrigerant discharged from the compressor all flows into the refrigerant branch for heat storage, a part of the refrigerant flowing out of the refrigerant branch flows into the indoor heat exchanger after throttling through the indoor expansion valve, evaporates, and then flows back to the compressor, and the other part of the refrigerant flowing out of the refrigerant branch flows into the outdoor heat exchanger after throttling through the outdoor expansion valve, evaporates, and then flows back to the compressor.

[0097] In other embodiments, the reversing assembly may also be configured as an integrated valve body or a combination of more than one valve bodies of other types with a reversing function to achieve the same flow direction regulating function.

[0098] In this embodiment, when both the indoor and outdoor heat exchangers are in an evaporating state and absorb ambient heat for energy storage in the energy storage device, the indoor and outdoor control valves can be accurately regulated by the above method, thereby effectively improving the cooling effect of the indoor environment and the energy storage effect of the energy storage device.

[0099] Further, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in the evaporation state, referring to Figure 4 , the step S20 comprises:

[0100] Step S21, when the outdoor ambient temperature is greater than or equal to a first preset temperature, determining the indoor control valve as the first target control valve, and determining the outdoor control valve as the second target control valve;

[0101] Step S22, when the outdoor ambient temperature is lower than a second preset temperature, determining the outdoor control valve as the first target control valve, and determining the indoor control valve as the second target control valve; wherein the second preset temperature is lower than or equal to the first preset temperature.

[0102] The first preset temperature and the second preset temperature may be pre-set fixed temperatures, or may be parameters determined according to the actual operation of the heat pump system, for example, the first preset temperature and the second preset temperature here are determined according to the set energy storage temperature of the energy storage device, and so on.

[0103] In this embodiment, when both the indoor and outdoor heat exchangers are in the evaporation state, the outdoor ambient temperature is relatively high, indicating that the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is relatively good. At this time, the outdoor control valve is controlled according to the preset opening, and the indoor control valve is adapted to the exhaust temperature control, thereby ensuring the accurate distribution of the refrigerant, so as to improve the evaporation effect of the indoor heat exchanger on the basis of maintaining a better evaporation state of the outdoor heat exchanger, which is beneficial to improving the indoor cooling effect while absorbing more ambient heat for heat storage in the energy storage device; when the outdoor ambient temperature is relatively low, indicating that the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is relatively poor, at this time, the indoor control valve is controlled according to the preset opening, and the outdoor control valve is adapted to the exhaust temperature control, thereby ensuring the accurate distribution of the refrigerant, so as to improve the evaporation effect of the outdoor heat exchanger on the basis of maintaining a better evaporation state of the indoor heat exchanger, which is beneficial to ensuring the indoor cooling effect while absorbing more ambient heat for heat storage in the energy storage device.

[0104] Furthermore, in this embodiment, after step S30, the process returns to step S10.

[0105] Step S20 includes: when the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, maintaining the current first target control valve and the current second target control valve unchanged; wherein the second preset temperature is less than the first preset temperature.

[0106] Among them, when there are the first target control valve and the second target control valve determined based on the outdoor ambient temperature last time, the current first target control valve is the same as the first target control valve last time, and the current second target control valve is the same as the second target control valve last time. That is, when the first target control valve last time is the indoor control valve and the second target control valve is the outdoor control valve, when the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, the first target control valve is still the indoor control valve, and the second target control valve is still the outdoor control valve; when the first target control valve last time is the outdoor control valve and the second target control valve is the indoor control valve, when the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, the first target control valve is still the outdoor control valve, and the second target control valve is still the indoor control valve.

[0107] In addition, one of the indoor control valve and the outdoor control valve can be set as the initial first target control valve, and the other of the indoor control valve and the outdoor control valve can be set as the initial second target control valve. If there is no first target control valve and second target control valve determined based on the outdoor ambient temperature last time, the current first target control valve is the initial first target control valve, and the current second target control valve is the initial second target control valve.

[0108] In this embodiment, the above-mentioned method is helpful to reduce unnecessary switching of the control modes of the indoor control valve and the outdoor control valve, so as to further improve the operating stability of the heat pump system.

[0109] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. Figure 4 , after step S10, further comprising:

[0110] Step S20a, determining a target exhaust temperature of the compressor according to the outdoor ambient temperature;

[0111] In this embodiment, in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in an evaporating state, and the energy storage device is in a heat storage state.

[0112] The target exhaust temperature is the target value that the exhaust temperature of the compressor needs to reach when the heat exchanger corresponding to the first target control valve is completely evaporated.

[0113] Different outdoor ambient temperatures correspond to different target exhaust temperatures. Specifically, a correspondence between the outdoor ambient temperature and the target exhaust temperature can be established in advance. The correspondence can include a calculation formula, a mapping table, etc. Based on the correspondence, the target exhaust temperature corresponding to the current outdoor ambient temperature can be determined.

[0114] Different outdoor ambient temperatures correspond to different target exhaust temperature determination methods, and the determination methods may include state parameters for determining the target exhaust temperature and a corresponding relationship between the state parameters and the target exhaust temperature. Specifically, a corresponding relationship between the outdoor ambient temperature and the target exhaust temperature determination method may be established in advance, and based on the corresponding relationship, a determination method for the target exhaust temperature corresponding to the current outdoor ambient temperature may be determined, and the target exhaust temperature may be determined according to the determination method.

[0115] Step S20a is executed before step S30, and the execution order of step S20a and step S20 is not specifically limited.

[0116] Based on step S20a, the operation control process of the first target control valve is: controlling the operation of the first target control valve according to the exhaust temperature of the compressor and the target exhaust temperature, and step S30 includes:

[0117] Step S31, controlling the first target control valve to operate according to the exhaust temperature of the compressor and the target exhaust temperature, and controlling the second target control valve to operate at a preset opening.

[0118] During the operation control of the first target control valve: a quantitative relationship value or a magnitude relationship between the exhaust temperature and the target exhaust temperature is determined, and the operation of the first target control valve is controlled based on the quantitative relationship value or the magnitude relationship.

[0119] In this embodiment, the temperature difference between the exhaust temperature and the target exhaust temperature is determined; when the temperature difference is less than a first preset temperature difference, the first target control valve is controlled to reduce the opening; when the temperature difference is greater than a second preset temperature difference, the first target control valve is controlled to increase the opening; when the temperature difference is greater than or equal to the first preset temperature difference, and the temperature difference is less than or equal to the second preset temperature difference, the first target control valve is controlled to maintain the current opening; wherein, the first preset temperature difference is less than the second preset temperature difference.

[0120] Different first target control valves correspond to different first preset temperature differences and second preset temperatures. The second preset temperature difference corresponding to the indoor control valve is greater than the second preset temperature difference corresponding to the outdoor control valve, and the first preset temperature difference corresponding to the indoor control valve is less than the first preset temperature difference corresponding to the outdoor control valve.

[0121] In this embodiment, the temperature difference is positively correlated with the opening adjustment range of the first target control valve during the process of increasing or decreasing the opening of the first target control valve. Specifically, the interval where the temperature deviation is located can be determined, and the preset adjustment value corresponding to the interval is used as the opening adjustment value.

[0122] The opening adjustment value can be determined according to the temperature difference between the exhaust temperature and the target exhaust temperature, and different temperature difference values ​​correspond to different opening adjustment values.

[0123] There may be a plurality of temperature difference intervals pre-divided, and each temperature difference interval is associated with a preset adjustment value. The range of the temperature interval corresponding to the indoor control valve is greater than the range of the temperature interval corresponding to the outdoor control valve.

[0124] For example, when the first target control valve is an indoor control valve, a positive opening change value indicates an increase in the opening, and a negative opening change value indicates a decrease in the opening. The first preset temperature difference is 5, and the second preset temperature difference is -5. The temperature difference value and the opening adjustment value are shown in Table 1 below:

[0125]

[0126]

[0127] Table 1

[0128] For another example, when the second target control valve is an outdoor control valve, a positive opening change value indicates an increase in the opening, and a negative opening change value indicates a decrease in the opening. The first preset temperature difference is 2, and the second preset temperature difference is -2. The temperature difference values ​​and the opening adjustment values ​​are shown in Table 2 below:

[0129] condition Opening change value TP-TP_trg<-4℃ -18 -4≤TP-TP_trg<-3℃ -12 -3≤TP-TP_trg<-2℃ -6 -2≤TP=TP_trg≤2℃ 0 2<TP-TP_trg≤3℃ 6 3<TP-TP_trg≤4℃ 12 TP-TP_trg>4℃ 18

[0130] Table 2

[0131] In other embodiments, when it is necessary to increase or decrease the opening of the first target control valve, it can also be adjusted by a preset fixed opening.

[0132] In this embodiment, the outdoor ambient temperature can accurately reflect the heat exchange state of the indoor and outdoor heat exchangers under the current working conditions. Therefore, the target exhaust temperature is determined according to the outdoor ambient temperature, which is conducive to improving the accuracy of the opening adjustment of the first target control valve, and is conducive to further improving the indoor heat exchange effect and energy storage effect. Among them, when the temperature difference between the exhaust temperature and the target exhaust temperature is too large, the opening of the first target control valve is increased, and when the temperature difference is too small, the opening of the first target control valve is reduced, which is conducive to making the exhaust temperature reach the target exhaust temperature through the opening adjustment of the first target control valve, and effectively improving the heat exchange effect of the heat exchanger corresponding to the adjustment of the first target control valve.

[0133] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in the evaporation state, and the energy storage device is in the heat storage state. Figure 5 , the step of determining the target exhaust temperature of the compressor according to the outdoor ambient temperature comprises:

[0134] Step S201, when the outdoor ambient temperature is greater than or equal to a first preset temperature, determining a first target exhaust temperature as the target exhaust temperature; the first target exhaust temperature is determined according to a first state parameter indicating a current heat exchange state of the indoor heat exchanger;

[0135] Step S202, when the outdoor ambient temperature is lower than a second preset temperature, determining a second target exhaust temperature as the target exhaust temperature, wherein the second target exhaust temperature is determined according to a second state parameter indicating a current heat exchange state of the outdoor heat exchanger;

[0136] Wherein, the second preset temperature is less than or equal to the first preset temperature.

[0137] The first state parameter and the second state parameter may be respectively operation parameters of the heat pump system related to the corresponding indoor heat exchanger and / or environmental parameters of the environment where the heat pump system is located.

[0138] In this embodiment, the first preset temperature and the second preset temperature refer to the same concept as the first preset temperature and the second preset temperature mentioned in the above embodiment. In other embodiments, the first preset temperature and the second preset temperature may also be set to refer to different concepts than the first preset temperature and the second preset temperature mentioned in the above embodiment.

[0139] The type of the first state parameter and the type of the second state parameter can be a preset fixed type, or a type determined according to the actual operation of the heat pump system, for example, the first state parameter and the second state parameter are selected according to the temperature difference between the current temperature of the energy storage device and the set energy storage temperature.

[0140] In this embodiment, when both the indoor and outdoor heat exchangers are in the evaporation state and the energy storage device is in the heat storage state, the heat exchange effect between the outdoor heat exchanger and the outdoor environment is relatively good when the outdoor ambient temperature is high. At this time, the first state parameter corresponding to the heat exchange state of the indoor heat exchanger with relatively weak heat exchange effect is used to determine the first target exhaust temperature, which is beneficial to improve the overall heat exchange effect of the indoor heat exchanger after the first target control valve opening is adjusted, thereby improving the indoor cooling effect while improving the heat storage effect of the energy storage device; when the outdoor ambient temperature is low, the heat exchange effect between the outdoor heat exchanger and the outdoor environment is relatively poor. At this time, the first state parameter corresponding to the heat exchange state of the outdoor heat exchanger is used to determine the first target exhaust temperature, which is beneficial to improve the overall heat exchange effect of the indoor heat exchanger after the first target control valve opening is adjusted, thereby improving the indoor cooling effect while improving the heat storage effect of the energy storage device.

[0141] Further, in this embodiment, the first state parameter includes the operating frequency of the compressor and the outdoor ambient temperature, and the second state parameter includes the operating frequency of the compressor, the first temperature of the indoor heat exchanger, and the second temperature of the outdoor heat exchanger.

[0142] In this embodiment, the heat pump system includes more than one indoor unit, and the indoor heat exchanger temperature of the indoor unit with energy demand in the preset mode is obtained; the first temperature is determined according to all the indoor heat exchanger temperatures. In this embodiment, the average of all indoor heat exchanger temperatures is used as the first temperature. In other embodiments, the highest temperature among all indoor heat exchanger temperatures can also be used as the first temperature, and so on.

[0143] For example, the first target temperature can be calculated by the following formula: TP_trg1 = a1F + b1 + T4, TP_trg1 is the first target exhaust temperature; Tp is the current actual exhaust temperature; F is the compressor operating frequency; a1 is the frequency coefficient; b1 is the coefficient; T4 is the outdoor ambient temperature. For another example, the second target temperature can be calculated by the following formula: TP_trg2 = aF + b*T2.avg + c*T3 + d, TP_trg2 is the target exhaust temperature; F is the compressor operating frequency; a is the frequency coefficient; b is the coefficient; c is the coefficient d is a constant, T2.avg is the average temperature of the indoor coil of the energy demand indoor unit; T3 is the outdoor heat exchanger temperature.

[0144] In this embodiment, the compressor operating frequency and the outdoor ambient temperature can accurately reflect the heat exchange state of the indoor heat exchanger when the outdoor ambient temperature is too high. The compressor operating frequency, the temperature of the indoor heat exchanger, and the temperature of the outdoor heat exchanger can accurately reflect the heat exchange state of the outdoor heat exchanger when the outdoor ambient temperature is low. Using the above parameters as the first state parameter and the second state parameter, respectively, is conducive to improving the accuracy of the determined target exhaust temperature and further improving the refrigeration effect and heat storage effect of the heat pump system.

[0145] In other embodiments, the first state parameter may also include one of the operating frequency and the outdoor ambient temperature or other types of parameters. The second state parameter may also include one of the first temperature and the second temperature or other types of parameters.

[0146] Furthermore, in this embodiment, after step S30, the process returns to step S10.

[0147] Step S20a includes: when the outdoor ambient temperature is greater than or equal to the second preset temperature, and when the outdoor ambient temperature is less than the first preset temperature, maintaining the current target exhaust temperature unchanged; wherein the second preset temperature is less than the first preset temperature.

[0148] When there is a target exhaust temperature that was determined last time based on the outdoor ambient temperature, the current target exhaust temperature is the same as the last target exhaust temperature.

[0149] In addition, the initial target exhaust temperature may be preset according to the operating state and / or environmental state of the heat pump system. If there is no target exhaust temperature determined last based on the outdoor ambient temperature, the current target exhaust temperature is.

[0150] In this embodiment, the above-mentioned method is helpful to reduce unnecessary switching of the control modes of the indoor control valve and the outdoor control valve, so as to further improve the operating stability of the heat pump system.

[0151] Further, based on any of the above embodiments, the heat pump system includes more than one indoor unit, the indoor unit includes the indoor control valve and the indoor heat exchanger, and the step of controlling the second target control valve to operate at a preset opening includes: when the second target control valve is the outdoor control valve, controlling the outdoor control valve to operate at a first preset opening; when the second target control valve is the indoor control valve, controlling the indoor control valve to operate at a second preset opening; wherein, the first preset opening is greater than the second preset opening.

[0152] For example, the second preset opening corresponding to the indoor control valve is 50 pls, and the first preset opening corresponding to the outdoor control valve is 150 pls.

[0153] The first preset opening corresponding to the outdoor control valve is greater than the second preset opening corresponding to the indoor control valve, which is beneficial to ensure that when more than one indoor unit has energy demand, the indoor control valve will not cause the amount of refrigerant in the outdoor heat exchanger to be too small when adjusting according to the exhaust temperature. When the outdoor control valve is adjusted according to the exhaust temperature, the energy demand allocated to all indoor units will not be too much, ensuring that both indoor and outdoor heat exchangers are in a better heat exchange state, further improving the indoor heat exchange effect and energy storage effect.

[0154] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the relevant steps of any embodiment of the control method of the heat pump system are implemented.

[0155] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0156] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0157] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0158] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system includes a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger, the refrigerant main circuit also includes a compressor connected to the indoor heat exchanger and the outdoor heat exchanger respectively, the refrigerant branch circuit includes an energy storage device, and the control method of the heat pump system includes the following steps: Controlling the heat pump system to operate in a preset mode to obtain an outdoor ambient temperature, wherein the indoor heat exchanger and the outdoor heat exchanger are in the same heat exchange state in the preset mode, and the energy storage device is in an energy storage state; Determine a first target control valve and a second target control valve in the outdoor control valve and the indoor control valve according to the outdoor ambient temperature; The first target control valve is controlled to operate according to the exhaust gas temperature of the compressor, and the second target control valve is controlled to operate at a preset opening.

2. The control method of the heat pump system according to claim 1, characterized in that: In the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in an evaporating state, and the energy storage device is in a heat storage state, and the step of determining the first target control valve and the second target control valve of the outdoor control valve and the indoor control valve according to the outdoor ambient temperature comprises: When the outdoor ambient temperature is greater than or equal to a first preset temperature, determining the indoor control valve as the first target control valve, and determining the outdoor control valve as the second target control valve; When the outdoor ambient temperature is lower than a second preset temperature, determining the outdoor control valve as the first target control valve, and determining the indoor control valve as the second target control valve; Wherein, the second preset temperature is less than or equal to the first preset temperature.

3. The control method of the heat pump system according to claim 2, characterized in that: After the step of controlling the first target control valve to operate according to the target exhaust temperature and controlling the second target control valve to operate at a preset opening, the method further includes: returning to the step of controlling the heat pump system to operate in a preset mode and acquiring an outdoor ambient temperature; The step of determining the first target control valve and the second target control valve of the outdoor control valve and the indoor control valve according to the outdoor ambient temperature further includes: When the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, maintaining the current first target control valve and the second target control valve unchanged; Wherein, the second preset temperature is lower than the first preset temperature.

4. The control method of the heat pump system according to claim 1, characterized in that: After the step of obtaining the outdoor ambient temperature, the method further includes: determining a target exhaust temperature of the compressor according to the outdoor ambient temperature; The step of controlling the operation of the first target control valve according to the exhaust temperature of the compressor comprises: The first target control valve is controlled to operate according to the exhaust gas temperature of the compressor and the target exhaust gas temperature.

5. The control method of the heat pump system according to claim 4, characterized in that: In the preset mode, the indoor heat exchanger and the outdoor heat exchanger are both in an evaporating state, and the energy storage device is in a heat storage state, and the step of determining the target exhaust temperature of the compressor according to the outdoor ambient temperature includes: When the outdoor ambient temperature is greater than or equal to a first preset temperature, determining a first target exhaust temperature as the target exhaust temperature; When the outdoor ambient temperature is lower than a second preset temperature, determining a second target exhaust temperature as the target exhaust temperature; The second preset temperature is less than or equal to the first preset temperature, the first target exhaust temperature is determined according to a first state parameter indicating a current heat exchange state of the indoor heat exchanger, and the second target exhaust temperature is determined according to a second state parameter indicating a current heat exchange state of the outdoor heat exchanger.

6. The control method of the heat pump system according to claim 5, characterized in that: The first state parameter includes the operating frequency of the compressor and the outdoor ambient temperature, and the second state parameter includes the operating frequency of the compressor, a first temperature of the indoor heat exchanger, and a second temperature of the outdoor heat exchanger.

7. The control method of the heat pump system according to claim 6, characterized in that: The heat pump system includes more than one indoor unit, and the indoor unit includes the indoor control valve and the indoor heat exchanger. The control method of the heat pump system further includes: Acquiring the indoor heat exchanger temperature of the indoor unit with energy demand in the preset mode; The first temperature is determined according to all the indoor heat exchanger temperatures.

8. The control method of the heat pump system according to claim 5, characterized in that: After the step of controlling the first target control valve to operate according to the target exhaust temperature and controlling the second target control valve to operate at a preset opening, the method further includes: returning to the step of controlling the heat pump system to operate in a preset mode and acquiring an outdoor ambient temperature; The step of determining the target exhaust temperature of the compressor according to the outdoor ambient temperature further includes: When the outdoor ambient temperature is greater than or equal to the second preset temperature, and the outdoor ambient temperature is less than the first preset temperature, maintaining the current target exhaust temperature unchanged; Wherein, the second preset temperature is lower than the first preset temperature.

9. The control method of the heat pump system according to claim 4, characterized in that: The step of controlling the operation of the first target control valve according to the exhaust temperature of the compressor and the target exhaust temperature comprises: Determining a temperature difference between the exhaust temperature and a target exhaust temperature; When the temperature difference is less than a first preset temperature difference, controlling the first target control valve to reduce its opening degree; When the temperature difference is greater than a second preset temperature difference, controlling the first target control valve to increase its opening; When the temperature difference is greater than or equal to the first preset temperature difference, and the temperature difference is less than or equal to the second preset temperature difference, controlling the first target control valve to maintain the current opening; Wherein, the first preset temperature difference is smaller than the second preset temperature difference.

10. The control method of the heat pump system according to claim 1, characterized in that: The heat pump system includes more than one indoor unit, the indoor unit includes the indoor control valve and the indoor heat exchanger, and the step of controlling the second target control valve to operate at a preset opening includes: When the second target control valve is the outdoor control valve, controlling the outdoor control valve to operate at a first preset opening; When the second target control valve is the indoor control valve, controlling the indoor control valve to operate at a second preset opening; Wherein, the first preset opening is greater than the second preset opening.

11. The control method of a heat pump system according to any one of claims 1 to 10, characterized in that: The refrigerant main circuit also includes a reversing component, the indoor unit, the outdoor heat exchanger, the return air port of the compressor and the exhaust port of the compressor are all connected to the reversing component, one end of the refrigerant branch is connected to the exhaust port of the compressor, and the pipeline between the outdoor control valve and the indoor control valve is connected to the other end of the refrigerant branch. The step of controlling the heat pump system to run in a preset mode includes: The reversing assembly is controlled to operate so that both the indoor unit and the outdoor heat exchanger are connected to the return air port.

12. A heat pump system, characterized in that: The heat pump system includes a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger, the refrigerant main circuit also includes a compressor connected to the indoor heat exchanger and the outdoor heat exchanger respectively, and the refrigerant branch circuit includes an energy storage device; The indoor control valve and the outdoor control valve are both connected to the control device, which includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, wherein the control program of the heat pump system implements the steps of the control method of the heat pump system as described in any one of claims 1 to 11 when executed by the processor.

13. A storage medium, characterized in that: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 11 are implemented.

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