Control methods for heat pump systems, heat pump systems and storage media

Abstract

This invention discloses a control method for a heat pump system, a heat pump system, and a storage medium. The heat pump system includes a main refrigerant circuit and refrigerant branch circuits connected to the main circuit. The main refrigerant circuit includes an indoor heat exchanger, an indoor control valve, an outdoor control valve, and an outdoor heat exchanger. The main refrigerant circuit also includes compressors connected to the indoor and outdoor heat exchangers respectively. The refrigerant branch circuits include an energy storage device. The method includes: controlling the heat pump system to operate in a preset mode; acquiring the outdoor ambient temperature; within the preset mode, the indoor and outdoor heat exchangers are in the same heat exchange state, and the energy storage device is in an energy storage state; determining a first target control valve and a second target control valve among the outdoor and indoor control valves based on the outdoor ambient temperature; controlling the operation of the first target control valve based on the compressor's exhaust temperature; and controlling the second target control valve to operate at a preset opening degree. This invention aims to improve the heat exchange and energy storage effects of the heat pump system for indoor environments.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more particularly to a control method for a heat pump system, a heat pump system, and a storage medium. Background Technology

[0002] In addition to regulating the indoor environment, heat pump systems also incorporate energy storage devices such as water tanks to provide energy for other needs. During the refrigerant energy storage process, the indoor and outdoor heat exchangers can operate under the same heat exchange conditions. The opening of the expansion valves at the refrigerant inlets of the two heat exchangers is typically independently controlled based on the compressor's exhaust temperature and their respective control logics. However, this approach can lead to incoordination between the two control valves. For example, the indoor control valve might be closed to its minimum position while the outdoor control valve remains fully open, resulting in uneven refrigerant distribution between the indoor and outdoor heat exchangers. This reduces the heat exchange and energy storage efficiency of the heat pump system. Summary of the Invention

[0003] The main objective of this invention is to provide a control method for a heat pump system, a heat pump system, and a storage medium, with the aim of improving the heat exchange and energy storage effects of the heat pump system in indoor environments.

[0004] To achieve the above objectives, the present invention provides a control method for a heat pump system. The heat pump system includes a refrigerant main circuit and refrigerant branch circuits 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 compressors connected to the indoor heat exchanger and the outdoor heat exchanger respectively. The refrigerant branch circuits include an energy storage device. The control method for the heat pump system includes the following steps:

[0005] The heat pump system is controlled to operate in a preset mode to obtain the outdoor ambient temperature. In the preset mode, the indoor heat exchanger and the outdoor heat exchanger are in the same heat exchange state, and the energy storage device is in the energy storage state.

[0006] The first target control valve and the second target control valve among the outdoor control valve and the indoor control valve are determined based on the outdoor ambient temperature.

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

[0008] Optionally, in the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporation state, and the energy storage device is in a heat storage state. The step of determining the first target control valve and the second target control valve among the outdoor control valve and the indoor control valve based on the outdoor ambient temperature includes:

[0009] When the outdoor ambient temperature is greater than or equal to the first preset temperature, the indoor control valve is determined to be the first target control valve, and the outdoor control valve is determined to be the second target control valve.

[0010] When the outdoor ambient temperature is lower than the second preset temperature, the outdoor control valve is determined to be the first target control valve, and the indoor control valve is determined to be 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 steps 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 steps of executing the preset mode for controlling the heat pump system to operate and obtaining the outdoor ambient temperature.

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

[0014] 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, the current first target control valve and the second target control valve remain unchanged.

[0015] 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] The target discharge temperature of the compressor is determined based on the outdoor ambient temperature.

[0018] The step of controlling the operation of the first target control valve based on the exhaust temperature of the compressor includes:

[0019] The first target control valve is controlled to operate based on the compressor's exhaust temperature and the target exhaust temperature.

[0020] Optionally, in the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporation state, and the energy storage device is in a heat storage state. The step of determining the target discharge temperature of the compressor based on the outdoor ambient temperature includes:

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

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

[0023] Wherein, 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 representing the current heat exchange state of the indoor heat exchanger, and the second target exhaust temperature is determined according to a second state parameter representing the 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, each indoor unit including the indoor control valve and the indoor heat exchanger, and the control method of the heat pump system further includes:

[0026] Obtain the indoor heat exchanger temperature of the indoor unit in the preset mode that meets the energy requirements;

[0027] The first temperature is determined based on the temperatures of all the indoor heat exchangers.

[0028] Optionally, after the steps 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 steps of executing the preset mode for controlling the heat pump system to operate and obtaining the outdoor ambient temperature.

[0029] The step of determining the target discharge temperature of the compressor based on the outdoor ambient temperature further includes:

[0030] When the outdoor ambient temperature is greater than or equal to the second preset temperature, or when the outdoor ambient temperature is less than the first preset temperature, the current target exhaust temperature is maintained unchanged.

[0031] 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 based on the compressor's exhaust temperature and the target exhaust temperature includes:

[0033] Determine the temperature difference between the exhaust temperature and the target exhaust temperature;

[0034] When the temperature difference is less than the first preset temperature difference, the opening of the first target control valve is reduced.

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

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

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

[0038] Optionally, the heat pump system includes more than one indoor unit, the indoor unit including 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 degree includes:

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

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

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

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

[0043] Control the operation of the reversing assembly so that both the indoor unit and the outdoor heat exchanger are connected to the return air port.

[0044] In addition, to achieve the above objectives, this application also proposes a heat pump system, which includes a control device, a refrigerant main line and refrigerant branch lines connected to the refrigerant main line. The refrigerant main line includes an indoor heat exchanger, an indoor control valve, an outdoor control valve and an outdoor heat exchanger. The refrigerant main line also includes a compressor connected to the indoor heat exchanger and the outdoor heat exchanger respectively. The refrigerant branch lines include an energy storage device.

[0045] Both the indoor control valve and the outdoor control valve are 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, it implements the steps of the control method for the heat pump system as described above.

[0046] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0047] This invention proposes a control method for a heat pump system. Based on a heat pump system equipped with components such as an energy storage device, a compressor, an indoor heat exchanger, an outdoor heat exchanger, an outdoor control valve, and an indoor control valve, the system operates in a preset mode where the indoor and outdoor heat exchangers are in the same heat exchange state, and the energy storage device is in an energy storage state. During this process, the target exhaust temperature required for the heat pump system to operate is determined based on the outdoor ambient temperature. Based on the outdoor ambient temperature, a target control valve is determined among the indoor and outdoor control valves that needs to be controlled according to the target exhaust temperature. While adjusting the opening of the target control valve according to the compressor's exhaust temperature, the other control valve is simultaneously controlled to operate at a preset opening. This avoids the situation where both indoor and outdoor control valves are independently controlled according to the exhaust temperature, resulting in excessively large or small valve openings. It also prevents uneven refrigerant distribution between the indoor and outdoor heat exchangers, effectively improving the heat exchange and energy storage effects of the heat pump system. Attached Figure Description

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

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

[0050] Figure 3 This is a flowchart illustrating an embodiment of the control method for the heat pump system of the present invention;

[0051] Figure 4 This is a schematic flowchart of another embodiment of the control method for the heat pump system of the present invention;

[0052] Figure 5 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention;

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

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

[0055] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0056] This invention provides a heat pump system.

[0057] In this embodiment of the invention, reference is made to Figure 1 and Figure 2 The heat pump system includes a control device 100, a main refrigerant circuit, and refrigerant branch circuits connected to the main refrigerant circuit. The main refrigerant circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, an outdoor control valve 4, and a reversing assembly 5. The refrigerant branch circuits include an energy storage device 7 and a first control valve 8. The indoor unit, the reversing assembly 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 unit, which includes an outdoor heat exchanger 3 and a corresponding outdoor fan. The compressor 1 can also be built into the outdoor unit. Both the outdoor control valve 4 and the first control valve 8 can be electronic expansion valves.

[0058] In this embodiment, the energy storage device 7 includes a water tank or a water heater, and external water-using equipment can be connected to the water tank to utilize the water containing 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 one 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 equipped with a flow direction regulating component. The pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch. The return 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 component. The refrigerant branch switches between two states: being connected to the return port of the compressor 1 and being connected to the exhaust port of the compressor 1, through the flow direction regulating component. One end of the refrigerant branch is connected to the exhaust port of the compressor 1.

[0061] In this embodiment, there is more than one indoor unit, which can be connected in parallel. In other embodiments, there may be only one indoor unit.

[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 a control device 100, which can be used to control the refrigerant flow through the indoor heat exchanger 21. The indoor control valve 22 can be an electronic expansion valve.

[0063] The indoor unit, outdoor control valve 4, and outdoor heat exchanger 3 are connected in sequence. The pipe between the outdoor control valve 4 and the indoor unit is connected to one end of the refrigerant branch. The exhaust port of the indoor unit, outdoor heat exchanger 3, and compressor 1, as well as the return port of compressor 1, are all connected to the reversing assembly 5. The reversing assembly 5 can be used to switch the connection status between the indoor unit and outdoor heat exchanger 3 and the exhaust port and return port of 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 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 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 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 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 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 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), which can be used to switch the connection state between the energy storage device 7 and the discharge port and return port of the compressor 1. The switching valve can 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 discharge port of the compressor 1 is connected to the energy storage device 7.

[0068] Through the adjustment of the first reversing valve 51, the second reversing valve 52, the first control valve 8, and the indoor control valve 22, the operating 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 in the first valve position, the second reversing valve 52 operates in the fourth valve position, the indoor control valve 22 is closed, and the first control valve 8 is open. 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. The refrigerant flowing into the refrigerant branch stores heat in the energy storage device 7 as it flows through the energy storage device 7. The refrigerant flowing out of the refrigerant branch flows sequentially through the outdoor control valve 4 and the outdoor heat exchanger 3 before returning to the compressor 1. In the first mode, the indoor heat exchanger 21 stops exchanging heat, the outdoor heat exchanger 3 is in an evaporating state, and the energy storage device 7 is in a condensing state. 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 independently.

[0070] In the second mode, the first reversing valve 51 operates in the first valve position, the second reversing valve 52 operates in the third valve position, the first control valve 8 is open, and the indoor control valve 22 is open. 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). A portion of the refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3 and the outdoor control valve 4, while another portion of the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The refrigerant flowing into the refrigerant branch stores heat in the energy storage device 7 as it flows 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 then flows into the indoor unit for evaporation before returning to the compressor 1. In the second mode, the indoor heat exchanger 21 is in an evaporation state, and the outdoor heat exchanger 3 is in a condensation state. In the second mode, when the indoor space regulated by the indoor unit has a heat exchange requirement, 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; when the indoor space regulated by the indoor unit does not have a heat exchange requirement, 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 its environment can be stored in the energy storage device 7. In the second mode, the energy storage device 7 can store heat during the cooling process of the indoor environment, or the oil in the compressor 1 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 1The first reversing valve 51 operates in the first valve position, the second reversing valve 52 operates in the fourth valve position, the first control valve 8 is open, and the indoor control valve 22 operates at a throttling rate. 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. When the refrigerant flowing into the refrigerant branch passes through the energy storage device 7, heat is stored in the energy storage device 7. A portion of the refrigerant flowing out of the refrigerant branch flows sequentially through the outdoor control valve 4 and the outdoor heat exchanger 3 before returning to the compressor 1. Another portion of the refrigerant flowing out of the refrigerant branch flows sequentially through the indoor control valve 22 and the indoor heat exchanger 21 before returning to the compressor 1. In the third mode, both the indoor heat exchanger 21 and the outdoor heat exchanger 3 are in an evaporation state. In the third mode, when the indoor space regulated by the indoor unit has a heat exchange requirement, 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; when the indoor space regulated by the indoor unit does not have a heat exchange requirement, 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 respective environments 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 in the first valve position, the second reversing valve 52 operates in the third valve position, the first control valve 8 is closed, and the indoor control valve 22 is open. 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). The refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3, the outdoor control valve 4, the indoor control valve 22, and the indoor heat exchanger 21 before returning 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. When the indoor space regulated by the indoor unit in the fourth mode has a heat exchange requirement, 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; when the indoor space regulated by the indoor unit in the fourth mode does not have a heat exchange requirement, 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, with the exhaust port of the compressor 1, the return port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 respectively connected to different ports of the third four-way valve.

[0074] Furthermore, refer to Figures 1 to 2 The heat pump system also includes a temperature sensor 01, which can be located on the exhaust side of the compressor 1 to detect the compressor's exhaust pressure. The temperature sensor 01 is connected to the control device 100.

[0075] Furthermore, refer to Figure 2The heat pump system also includes an environmental monitoring module 02, which is connected to the control device 100. The environmental monitoring module 02 can be located in the outdoor environment and is used to monitor the outdoor ambient temperature.

[0076] In this embodiment of the invention, reference is made to Figure 2 The control unit of the heat pump system includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be high-speed RAM or non-volatile memory, such as disk storage. Optionally, 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 does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0078] like Figure 2 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a 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 steps of the control method of the heat pump system in the following embodiments.

[0080] This invention also provides a control method for a heat pump system, applied to the aforementioned heat pump system.

[0081] Reference Figure 3 This application proposes an embodiment of a control method for a heat pump system. In this embodiment, the control method for the heat pump system includes:

[0082] Step S10: Control the heat pump system to operate in a preset mode, obtain the outdoor ambient temperature, and in the preset mode, the indoor heat exchanger and the outdoor heat exchanger are in the same heat exchange state, and the energy storage device is in the energy storage state.

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

[0084] The outdoor ambient temperature can be detected using the aforementioned environmental monitoring module.

[0085] Step S20: Determine the first target control valve and the second target control valve among the outdoor control valve and the indoor control valve based on the outdoor ambient temperature;

[0086] Based on the outdoor ambient temperature, one of the outdoor control valves and the indoor control valves is determined as the first target control valve, and the other of the outdoor control valves and the indoor control valves is determined as the second target control valve.

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

[0088] In one implementation of this embodiment, the temperature range of the outdoor ambient temperature can be determined, and the first target control valve and the second target control valve can be determined based on the temperature range.

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

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

[0091] In one implementation of this embodiment, the first control valve can be controlled to operate based on 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 or quantitative relationship between the exhaust temperature and the target exhaust temperature, so that the actual exhaust temperature of the compressor reaches the target exhaust temperature. Different first target control valves correspond to different target exhaust temperatures. The target exhaust temperature can be a pre-set fixed temperature or a parameter determined based on the actual operating parameters of the heat pump system.

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

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

[0094] This invention proposes a control method for a heat pump system. In a preset mode, the indoor and outdoor heat exchangers are in the same heat exchange state, and the energy storage device is in the energy storage state. During this process, the target exhaust temperature required for the operation of the heat pump system is determined based on the outdoor ambient temperature. Based on the outdoor ambient temperature, the target control valve that needs to be controlled according to the target exhaust temperature is determined among the indoor and outdoor control valves. While adjusting the opening of the target control valve according to the compressor's exhaust temperature, the other control valve is controlled to operate at a preset opening. This avoids the situation where the opening of the two control valves is too large or too small when both the indoor and outdoor control valves are independently controlled according to the exhaust temperature. This can prevent uneven distribution of refrigerant between the indoor and outdoor heat exchangers and effectively improve the heat exchange and energy storage effects of the heat pump system.

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

[0096] In this embodiment, the reversing assembly includes the first reversing valve and the second reversing valve described above. The preset mode is the third mode described above, where the indoor fan is on, both the indoor and outdoor heat exchangers are in evaporation mode, the energy storage device is in heat storage mode, all the refrigerant discharged from the compressor flows into the refrigerant branch for heat storage, a portion of the refrigerant flowing out of the refrigerant branch is throttled by the indoor expansion valve and flows into the indoor heat exchanger for evaporation before returning to the compressor, and the other portion of the refrigerant flowing out of the refrigerant branch is throttled by the outdoor expansion valve and flows into the outdoor heat exchanger for evaporation before returning to the compressor.

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

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

[0099] Furthermore, based on the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporation state within the preset mode, referring to... Figure 4 Step S20 includes:

[0100] Step S21: When the outdoor ambient temperature is greater than or equal to the first preset temperature, determine the indoor control valve as the first target control valve and determine the outdoor control valve as the second target control valve.

[0101] Step S22: When the outdoor ambient temperature is lower than the second preset temperature, the outdoor control valve is determined to be the first target control valve, and the indoor control valve is determined to be the second target control valve; wherein, the second preset temperature is less than or equal to the first preset temperature.

[0102] The first and second preset temperatures can be fixed temperatures set in advance, or they can be parameters determined based on the actual operation of the heat pump system. For example, the first and second preset temperatures can be determined based on 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 high, indicating that the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is good. At this time, the outdoor control valve is controlled according to the preset opening degree, and the indoor control valve is adapted to the exhaust temperature control, thereby ensuring accurate refrigerant distribution. This improves the evaporation effect of the indoor heat exchanger while maintaining a good evaporation state of the outdoor heat exchanger, which is beneficial for improving the indoor cooling effect while absorbing more ambient heat for the energy storage device. When the outdoor ambient temperature is low, it indicates that the heat exchange efficiency between the outdoor heat exchanger and the outdoor environment is poor. At this time, the indoor control valve is controlled according to the preset opening degree, and the outdoor control valve is adapted to the exhaust temperature control, thereby ensuring accurate refrigerant distribution. This improves the evaporation effect of the outdoor heat exchanger while maintaining a good evaporation state of the indoor heat exchanger, which is beneficial for ensuring the indoor cooling effect while absorbing more ambient heat for 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 when 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] Specifically, when there is a first target control valve and a second target control valve previously determined based on the outdoor ambient temperature, the current first target control valve is the same as the previous first target control valve, and the current second target control valve is the same as the previous second target control valve. That is, if the previous first target control valve was an indoor control valve and the second target control valve was an outdoor control valve, then 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, the first target control valve remains an indoor control valve, and the second target control valve remains an outdoor control valve. Similarly, if the previous first target control valve was an outdoor control valve and the second target control valve was an indoor control valve, then 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, the first target control valve remains an outdoor control valve, and the second target control valve remains an indoor control valve.

[0107] Alternatively, 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. In the absence of a first target control valve and a second target control valve determined based on the outdoor ambient temperature in the previous test, 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 method helps to reduce unnecessary switching of control modes between indoor and outdoor control valves, thereby further improving the operational stability of the heat pump system.

[0109] Furthermore, based on any of the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 4 After step S10, the method further includes:

[0110] Step S20a: Determine the target exhaust temperature of the compressor based on the outdoor ambient temperature;

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

[0112] The target exhaust temperature is the target value that the compressor exhaust temperature needs to reach when the heat exchanger is fully evaporated, as adjusted by the first target control valve.

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

[0114] Different outdoor ambient temperatures correspond to different methods for determining the target exhaust temperature. These methods may include state parameters used to determine the target exhaust temperature and the correspondence between these state parameters and the target exhaust temperature. Specifically, a correspondence between the outdoor ambient temperature and the methods for determining the target exhaust temperature can be established in advance. Based on this correspondence, the method for determining the target exhaust temperature corresponding to the current outdoor ambient temperature can be determined, and the target exhaust temperature can be determined according to this method.

[0115] Step S20a is executed before step S30, and the order in which steps S20a and S20 are executed is not specifically limited.

[0116] Based on step S20a, the first target control valve operation control process is as follows: The first target control valve is controlled to operate according to the compressor's exhaust temperature and the target exhaust temperature. Therefore, step S30 includes:

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

[0118] During the operation and control of the first target control valve: determine the quantitative relationship or magnitude relationship between the exhaust temperature and the target exhaust temperature, and control the operation of the first target control valve based on the quantitative relationship or 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 opening of the first target control valve is reduced; when the temperature difference is greater than a second preset temperature difference, the opening of the first target control valve is increased; when the temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, the first target control valve is controlled to maintain its 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 range of temperature deviation can be determined, and the preset adjustment value corresponding to this range can be used as the opening adjustment value.

[0122] The opening adjustment value can be determined based on the temperature difference between the exhaust temperature and the target exhaust temperature. Different temperature differences correspond to different opening adjustment values.

[0123] This system can be pre-divided into multiple temperature ranges, each with a corresponding preset adjustment value. The temperature range corresponding to the indoor control valve has a larger range than that corresponding to the outdoor control valve.

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

[0125]

[0126]

[0127] Table 1

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

[0129] condition Change in opening 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, the opening of the first target control valve can be adjusted by a pre-set fixed opening when it is necessary to increase or decrease the opening.

[0132] In this embodiment, the outdoor ambient temperature accurately reflects the heat exchange status of the indoor and outdoor heat exchangers under current operating conditions. Therefore, determining the target exhaust temperature based on the outdoor ambient temperature is beneficial for improving the accuracy of the opening adjustment of the first target control valve, and further improving the indoor heat exchange and energy storage effects. Specifically, 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; when the temperature difference is too small, the opening of the first target control valve is decreased. This allows the exhaust temperature to reach the target exhaust temperature through the adjustment of the opening of the first target control valve, effectively improving the heat exchange effect of the heat exchanger corresponding to the adjustment of the first target control valve.

[0133] Furthermore, based on any of the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, in the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporation state, and the energy storage device is in a heat storage state, referring to... Figure 5 The step of determining the target discharge temperature of the compressor based on the outdoor ambient temperature includes:

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

[0135] Step S202: When the outdoor ambient temperature is lower than the second preset temperature, the second target exhaust temperature is determined as the target exhaust temperature. The second target exhaust temperature is determined according to the second state parameter representing the 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 can be the operating parameters of the heat pump system associated with the corresponding indoor heat exchanger and / or the environmental parameters of the environment in which the heat pump system is located, respectively.

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

[0139] The types of the first state parameter and the second state parameter can be preset fixed types, or they can be determined according to the actual operating conditions of the heat pump system. For example, the first state parameter and the second state parameter can be selected based on 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 an evaporation state and the energy storage device is in a 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 target exhaust temperature is determined by the first state parameter corresponding to the heat exchange state of the indoor heat exchanger, which has a relatively weak heat exchange effect. This is beneficial for improving the overall heat exchange effect of the indoor heat exchanger after adjusting the opening of the first target control valve, thereby improving the indoor cooling effect and 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 target exhaust temperature is determined by the first state parameter corresponding to the heat exchange state of the outdoor heat exchanger. This is beneficial for improving the overall heat exchange effect of the indoor heat exchanger after adjusting the opening of the first target control valve, thereby improving the indoor cooling effect and the heat storage effect of the energy storage device.

[0141] Furthermore, 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. The system acquires the indoor heat exchanger temperature of the indoor unit with energy demand in the preset mode; and determines the first temperature based on 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 using the following formula: TP_trg1=a1F+b1+T4, where 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 a coefficient; and T4 is the outdoor ambient temperature. Similarly, the second target temperature can be calculated using the following formula: TP_trg2=aF+b*T2.avg+c*T3+d, where TP_trg2 is the target exhaust temperature; F is the compressor operating frequency; a is the frequency coefficient; b is a coefficient; c is a coefficient; d is a constant; T2.avg is the average temperature of the indoor coil of the energy-consuming unit; and T3 is the outdoor heat exchanger temperature.

[0144] In this embodiment, the compressor operating frequency and outdoor ambient temperature can accurately reflect the heat exchange status of the indoor heat exchanger when the outdoor ambient temperature is too high. The compressor operating frequency, indoor heat exchanger temperature, and outdoor heat exchanger temperature can accurately reflect the heat exchange status 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 beneficial to improving the accuracy of the determined target exhaust temperature and further improving the cooling and heat storage effects 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: maintaining the current target exhaust temperature unchanged 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; wherein the second preset temperature is less than the first preset temperature.

[0148] In cases where there is a previous target exhaust temperature determined based on the outdoor ambient temperature, the current target exhaust temperature is the same as the previous target exhaust temperature.

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

[0150] In this embodiment, the above method helps to reduce unnecessary switching of control modes between indoor and outdoor control valves, thereby further improving the operational stability of the heat pump system.

[0151] Furthermore, 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 degree includes: when the second target control valve is the outdoor control valve, controlling the outdoor control valve to operate at a first preset opening degree; when the second target control valve is the indoor control valve, controlling the indoor control valve to operate at a second preset opening degree; wherein, the first preset opening degree is greater than the second preset opening degree.

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

[0153] The first preset opening degree corresponding to the outdoor control valve is greater than the second preset opening degree corresponding to the indoor control valve. This is beneficial to ensure that when more than one indoor unit has energy demand, the indoor control valve will not cause the refrigerant amount of the outdoor heat exchanger to be too low when it is adjusted 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 high. This ensures 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] Furthermore, embodiments of the present invention also propose a storage medium storing a control program for a heat pump system. When the control program for the heat pump system is executed by a processor, it implements the relevant steps of any embodiment of the control method for the heat pump system described above.

[0155] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0156] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0157] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0158] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection 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 line and refrigerant branch lines connected to the refrigerant main line. The refrigerant main line includes an indoor heat exchanger, an indoor control valve, an outdoor control valve, and an outdoor heat exchanger. The refrigerant main line also includes compressors connected to the indoor and outdoor heat exchangers respectively. The refrigerant branch lines include an energy storage device. One end of each refrigerant branch line is connected to the exhaust port of the compressor. The pipeline between the outdoor control valve and the indoor control valve is connected to the other end of the refrigerant branch line. The control method of the heat pump system includes the following steps: The heat pump system is controlled to operate in a preset mode to obtain the outdoor ambient temperature. In the preset mode, both the indoor heat exchanger and the outdoor heat exchanger are in an evaporation state, and the energy storage device is in a heat storage state. The first target control valve and the second target control valve among the outdoor control valve and the indoor control valve are determined based on the outdoor ambient temperature. 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 degree. The step of determining the first target control valve and the second target control valve among the outdoor control valve and the indoor control valve based on the outdoor ambient temperature includes: When the outdoor ambient temperature is greater than or equal to the first preset temperature, the indoor control valve is determined to be the first target control valve, and the outdoor control valve is determined to be the second target control valve. When the outdoor ambient temperature is lower than the second preset temperature, the outdoor control valve is determined to be the first target control valve, and the indoor control valve is determined to be the second target control valve. Wherein, the second preset temperature is less than or equal to the first preset temperature.

2. The control method for a heat pump system as described in claim 1, characterized in that, After the steps of 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, the method further includes: returning to the steps of controlling the heat pump system to operate in the preset mode and obtaining the outdoor ambient temperature. The step of determining the first target control valve and the second target control valve among the outdoor control valve and the indoor control valve based on the outdoor ambient temperature further 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, the current first target control valve and the second target control valve remain unchanged. The second preset temperature is lower than the first preset temperature.

3. The control method for a heat pump system as described in claim 1, characterized in that, After the step of obtaining the outdoor ambient temperature, the method further includes: The target discharge temperature of the compressor is determined based on the outdoor ambient temperature. The step of controlling the operation of the first target control valve based on the exhaust temperature of the compressor includes: The first target control valve is controlled to operate based on the compressor's exhaust temperature and the target exhaust temperature.

4. The control method for a heat pump system as described in claim 3, characterized in that, The step of determining the target discharge temperature of the compressor based on the outdoor ambient temperature includes: When the outdoor ambient temperature is greater than or equal to the first preset temperature, the first target exhaust temperature is determined as the target exhaust temperature; When the outdoor ambient temperature is lower than the second preset temperature, the second target exhaust temperature is determined as the target exhaust temperature; Wherein, 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 representing the current heat exchange state of the indoor heat exchanger, and the second target exhaust temperature is determined according to a second state parameter representing the current heat exchange state of the outdoor heat exchanger.

5. The control method for a heat pump system as described in claim 4, 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, the first temperature of the indoor heat exchanger, and the second temperature of the outdoor heat exchanger.

6. The control method for a heat pump system as described in claim 5, 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 control method of the heat pump system further includes: Obtain the indoor heat exchanger temperature of the indoor unit in the preset mode that meets the energy requirements; The first temperature is determined based on the temperatures of all the indoor heat exchangers.

7. The control method for a heat pump system as described in claim 4, characterized in that, After the steps of 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, the method further includes: returning to the steps of controlling the heat pump system to operate in the preset mode and obtaining the outdoor ambient temperature. The step of determining the target discharge temperature of the compressor based on the outdoor ambient temperature further includes: When the outdoor ambient temperature is greater than or equal to the second preset temperature, or when the outdoor ambient temperature is less than the first preset temperature, the current target exhaust temperature is maintained unchanged. The second preset temperature is lower than the first preset temperature.

8. The control method for a heat pump system as described in claim 3, characterized in that, The step of controlling the operation of the first target control valve based on the compressor's exhaust temperature and the target exhaust temperature includes: Determine the temperature difference between the exhaust temperature and the target exhaust temperature; When the temperature difference is less than the first preset temperature difference, the opening of the first target control valve is reduced. When the temperature difference is greater than the second preset temperature difference, the first target control valve is controlled to increase its opening. When the temperature difference is greater than or equal to the first preset temperature difference, and when the temperature difference is less than or equal to the second preset temperature difference, the first target control valve is controlled to maintain its current opening. Wherein, the first preset temperature difference is less than the second preset temperature difference.

9. The control method for a heat pump system as described in 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 degree includes: When the second target control valve is the outdoor control valve, the outdoor control valve is controlled to operate at a first preset opening degree; When the second target control valve is the indoor control valve, the indoor control valve is controlled to operate at the second preset opening degree; Wherein, the first preset opening degree is greater than the second preset opening degree.

10. The control method for a heat pump system as described in any one of claims 1 to 9, characterized in that, The refrigerant main circuit also includes a reversing assembly. The indoor unit of the heat pump system, the outdoor heat exchanger, the return port of the compressor, and the exhaust port of the compressor are all connected to the reversing assembly. The steps for controlling the heat pump system to operate in a preset mode include: Control the operation of the reversing assembly so that both the indoor unit and the outdoor heat exchanger are connected to the return air port.

11. A heat pump system, characterized in that, The heat pump system includes a control device, a refrigerant main line, and refrigerant branch lines connected to the refrigerant main line. The refrigerant main line includes an indoor heat exchanger, an indoor control valve, an outdoor control valve, and an outdoor heat exchanger. The refrigerant main line also includes a compressor connected to the indoor heat exchanger and the outdoor heat exchanger respectively. The refrigerant branch line includes an energy storage device. One end of the refrigerant branch line is connected to the exhaust port of the compressor. The pipeline between the outdoor control valve and the indoor control valve is connected to the other end of the refrigerant branch line. Both the indoor control valve and the outdoor control valve are 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, it implements the steps of the control method for the heat pump system as described in any one of claims 1 to 10.

12. A storage medium, characterized in that, The storage medium stores a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system as described in any one of claims 1 to 10.

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