Thermal management system control method, thermal management system, vehicle and storage medium

Abstract

The present invention discloses a thermal management system control method, a thermal management system, a vehicle, and a storage medium, belonging to the field of vehicle technology. The thermal management system control method, the thermal management system, the vehicle, and the storage medium of the present invention, when controlling the thermal management system to switch operating modes, first determine the target state of each component of the refrigerant circulation unit, then determine the control priority of each component of the refrigerant circulation unit based on the determined target state, and make the start priority of the control valve group and the expansion valve higher than the start priority of the compressor. In the same refrigerant circulation loop, the closing priority of the control valve group and the expansion valve is the lowest. Then, based on the control priority, each component is controlled to switch to the determined target state. This can avoid the high-pressure of the refrigerant circulation loop being too high due to first turning on the compressor and then turning on the control valve group, and can avoid the low-pressure of the refrigerant circulation loop being too low due to first turning on the compressor and then turning on the expansion valve.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a thermal management system control method, a thermal management system, a vehicle, and a storage medium. Background Art

[0002] New energy vehicles usually have a thermal management system, and the goal of vehicle thermal management is to keep the cab, battery, motor and controller in the optimal operating temperature range and minimize vehicle energy consumption.

[0003] In existing new energy vehicles, the refrigerant circulation loop of the thermal management system has the problem of large pressure fluctuations, which not only affects the thermal management effect, but also easily causes refrigerant leakage or damage to components in the refrigerant circulation loop, making it difficult to meet user needs. Summary of the Invention

[0004] An object of the present invention is to provide a thermal management system control method, a thermal management system, a vehicle, and a storage medium, which can improve the pressure stability of a refrigerant circulation circuit.

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] In a first aspect, a thermal management system control method is provided, wherein the thermal management system includes a refrigerant circulation unit, the refrigerant circulation unit including a compressor, a heat pump core, an evaporator, an outdoor heat exchanger and a control valve group, the heat pump core, the evaporator and the outdoor heat exchanger are connected via a plurality of refrigerant pipes, the control valve group is used to connect the heat pump core, the evaporator and the outdoor heat exchanger in series, or to connect the heat pump core and the outdoor heat exchanger in series, or to connect the heat pump core and the evaporator in series, or to connect the heat pump core and the outdoor heat exchanger in series and the heat pump core and the evaporator in parallel, or to connect the evaporator and the outdoor heat exchanger in series to form a plurality of different refrigerant circulation loops, any of the refrigerant circulation loops is provided with an expansion valve, and the compressor is used to compress the refrigerant in any of the refrigerant circulation loops;

[0007] The thermal management system control method comprises the following steps:

[0008] determining a target operating mode of the thermal management system;

[0009] determining a target state of each component of the refrigerant cycle unit under the target operating mode;

[0010] Determining control priorities of various components of the refrigerant cycle unit according to the determined target state; among the control priorities, the start-up priority of the control valve group and the expansion valve is higher than the start-up priority of the compressor, and in the same refrigerant cycle, the shut-down priority of the control valve group and the expansion valve is the lowest;

[0011] According to the control priority, each component of the refrigerant cycle unit is controlled to switch to the determined target state.

[0012] As an optional solution of the thermal management system control method, before determining the control priority of each component of the refrigerant cycle unit, the following steps are also included:

[0013] determining a current operating mode of the thermal management system;

[0014] Determining the current status of each component of the refrigerant cycle unit in the current operating mode;

[0015] Determining the control priority of each component of the refrigerant cycle unit includes the following steps:

[0016] According to the determined target state and the determined current state, control priorities of the respective components of the refrigeration cycle unit are determined.

[0017] As an optional solution of the thermal management system control method, the plurality of refrigerant circulation circuits include a first refrigerant circulation circuit and a second refrigerant circulation circuit;

[0018] Determining the control priority of each component of the refrigeration cycle unit according to the determined target state and the determined current state includes the following steps:

[0019] When the current working mode is that the first refrigerant circulation circuit is working and the second refrigerant circulation circuit is working, and the target working mode is that the first refrigerant circulation circuit is not working and the second refrigerant circulation circuit is working, the compressor is first controlled to reduce the speed, and then the control valve group in the second refrigerant circulation circuit is controlled to open, and finally the control valve group in the first refrigerant circulation circuit is controlled to close.

[0020] As an optional solution of the thermal management system control method, the refrigerant circulation unit further includes a high-pressure fan provided corresponding to the outdoor heat exchanger;

[0021] In the control priorities, the startup priority of the high-pressure fan is higher than the startup priority of the compressor.

[0022] As an optional solution of the thermal management system control method, controlling each component of the refrigerant circulation unit to switch to a determined target state according to the control priority includes the following steps:

[0023] When controlling any component to turn on to its target state, if there is a component with a lower turn-on priority than that component in the turned-on state, the component with a lower turn-on priority than that component is first controlled to switch to a safe state, and then the component is controlled to turn on to its target state; the safe state of the compressor is the state when the speed is reduced to a preset speed or the state when the compressor is turned off.

[0024] As an optional solution of the thermal management system control method, controlling each component of the refrigerant circulation unit to switch to a determined target state according to the control priority includes the following steps:

[0025] When controlling any component to close, if there is a component with a higher closing priority than the component that is open, the component with a higher closing priority than the component that is closed will be closed first, and then the component that is controlled to close will be closed.

[0026] As an optional solution of the thermal management system control method, controlling each component of the refrigerant circulation unit to switch to a determined target state according to the control priority includes the following steps:

[0027] When controlling any component to start up to its target state, if the component is already in the target state, the start-up of the component is skipped, and the component is controlled to continue working in the target state, and the next component is started;

[0028] According to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps:

[0029] When controlling any component to close, if the component has already been closed, skip closing the component, control the component to continue closing, and continue to close the next component.

[0030] In a second aspect, a thermal management system is provided, including a controller and a refrigerant circulation unit, wherein the refrigerant circulation unit includes:

[0031] A heat pump core, an evaporator and an outdoor heat exchanger, wherein the heat pump core, the evaporator and the outdoor heat exchanger are connected via a plurality of refrigerant pipes.

[0032] a control valve group, the control valve group being used to connect the heat pump core, the evaporator, and the outdoor heat exchanger in series, or to connect the heat pump core and the outdoor heat exchanger in series, or to connect the heat pump core and the evaporator in series, or to connect the heat pump core and the outdoor heat exchanger in series and the heat pump core and the evaporator in parallel, or to connect the evaporator and the outdoor heat exchanger in series, so as to form a plurality of different refrigerant circulation circuits, each of the refrigerant circulation circuits being provided with an expansion valve;

[0033] A compressor for compressing the refrigerant in any of the refrigerant circulation circuits

[0034] The controller is used to control the operation of the heat pump core, the evaporator, the outdoor heat exchanger, the expansion valve and the control valve group. The controller is also used to execute the thermal management system control method as described in any one of the above items.

[0035] In a third aspect, a vehicle is provided, comprising the thermal management system as described above.

[0036] In a fourth aspect, a storage medium is provided, on which a computer program is stored, characterized in that when the program is executed by a controller, the vehicle implements the thermal management system control method as described in any one of the above items.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The thermal management system control method, thermal management system, vehicle and storage medium of the present invention, when controlling the thermal management system to switch the working mode, first determine the target state of each component of the refrigerant circulation unit, and then determine the control priority of each component of the refrigerant circulation unit based on the determined target state, and make the start priority of the control valve group and the expansion valve higher than the start priority of the compressor, and in the same refrigerant circulation loop, the closing priority of the control valve group and the expansion valve is the lowest, and then according to the control priority, control the various components of the refrigerant circulation unit to switch to the determined target state, which can avoid turning on the compressor first and then turning on the control valve group, causing the high pressure of the refrigerant circulation loop to be too high, and can avoid turning on the compressor first and then turning on the expansion valve, causing the low pressure of the refrigerant circulation loop to be too low, thereby making the pressure of the refrigerant circulation loop more stable, which is beneficial to avoid refrigerant leakage or damage to components in the refrigerant circulation loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Flowchart of a thermal management system control method according to an embodiment of the present invention;

[0040] Figure 2 4 is a block diagram of a thermal management system in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0048] like Figure 1-2 As shown, this embodiment provides a thermal management system and a thermal management system control method, which is used to control the operation of the thermal management system to achieve the purpose of improving the pressure stability of the refrigerant circulation loop.

[0049] The thermal management system includes a refrigerant circulation unit, which includes a compressor, a heat pump core, an evaporator, an outdoor heat exchanger and a control valve group. The heat pump core, evaporator and outdoor heat exchanger are connected through multiple refrigerant pipes. The control valve group is used to connect the heat pump core, evaporator and outdoor heat exchanger in series in sequence, or to connect the heat pump core and the outdoor heat exchanger in series, or to connect the heat pump core and the evaporator in series, or to connect the heat pump core and the outdoor heat exchanger in series and the heat pump core and the evaporator in parallel, or to connect the evaporator and the outdoor heat exchanger in series to form multiple different refrigerant circulation loops. Any refrigerant circulation loop is provided with an expansion valve, and the compressor is used to compress the refrigerant in any refrigerant circulation loop.

[0050] The thermal management system control method of this embodiment includes the following steps:

[0051] S1. Determine the target operating mode of the thermal management system;

[0052] S2. determining target states of various components of the refrigerant cycle unit under the target operating mode;

[0053] S3. Determine the control priority of each component of the refrigerant circulation unit according to the determined target state; among the control priorities, the start-up priority of the control valve group and the expansion valve is higher than the start-up priority of the compressor, and in the same refrigerant circulation loop, the closing priority of the control valve group and the expansion valve is the lowest;

[0054] S4. Control each component of the refrigerant circulation unit to switch to the determined target state according to the control priority.

[0055] The thermal management system control method of this embodiment, when controlling the thermal management system to switch the working mode, first determines the target state of each component of the refrigerant circulation unit, and then determines the control priority of each component of the refrigerant circulation unit based on the determined target state, and makes the start priority of the control valve group and the expansion valve higher than the start priority of the compressor, and in the same refrigerant circulation loop, the closing priority of the control valve group and the expansion valve is the lowest, and then according to the control priority, controls each component of the refrigerant circulation unit to switch to the determined target state, which can avoid turning on the compressor first and then turning on the control valve group, causing the high pressure of the refrigerant circulation loop to be too high, and can avoid turning on the compressor first and then turning on the expansion valve, causing the low pressure of the refrigerant circulation loop to be too low, thereby making the pressure of the refrigerant circulation loop more stable, which is beneficial to avoid refrigerant leakage or damage to components in the refrigerant circulation loop.

[0056] It should be noted that the control valve group includes multiple valves, and the multiple valves are respectively connected to different refrigerant circulation circuits, and can further respectively control the connection or disconnection of multiple different refrigerant circulation circuits. It can be understood that when any refrigerant circulation circuit is connected, it indicates that the refrigerant can circulate in the refrigerant circulation circuit, that is, the refrigerant circulation circuit is in a working state; when any refrigerant circulation circuit is disconnected, it indicates that the refrigerant in the refrigerant circulation circuit is not circulating, that is, the refrigerant circulation circuit is not working.

[0057] Furthermore, before determining the control priority of each component of the refrigeration cycle unit, the following steps are also included:

[0058] Determine the current operating mode of the thermal management system;

[0059] Determine the current status of each component of the refrigerant cycle unit in the current operating mode;

[0060] Furthermore, determining the control priority of each component of the refrigerant cycle unit includes the following steps:

[0061] According to the determined target state and the determined current state, control priorities of the components of the refrigeration cycle unit are determined.

[0062] It should be noted that the current operating mode of the thermal management system may be that all refrigerant circuits are inoperative, or that some of the multiple refrigerant circuits are inoperative while others are inoperative. Therefore, when the thermal management system switches from the current operating mode to the target operating mode, it is necessary to control the valve group to connect the operating refrigerant circuits and disconnect the inoperative refrigerant circuits. In other words, it is necessary to open some valves in the control valve group and close others. It should be further noted that when any refrigerant circuit is in operation, the compressor must be operating.

[0063] For convenience of description, the plurality of refrigerant circulation circuits include a first refrigerant circulation circuit and a second refrigerant circulation circuit.

[0064] Furthermore, according to the determined target state and the determined current state, the control priority of each component of the refrigeration cycle unit is determined, including the following steps:

[0065] When the current working mode is that the first refrigerant circulation circuit is working and the second refrigerant circulation circuit is working, and the target working mode is that the first refrigerant circulation circuit is not working and the second refrigerant circulation circuit is working, the compressor is first controlled to reduce the speed, and then the control valve group in the second refrigerant circulation circuit is controlled to open, and finally the control valve group in the first refrigerant circulation circuit is controlled to close.

[0066] It's understandable that when adjusting any valve in the control valve group, the compressor speed must be reduced first to avoid system disturbances, excessive refrigerant high and low pressures, and inability to achieve the desired component states. Then, valves in the refrigerant circuits that require operation are opened first, followed by valves in the refrigerant circuits that do not require operation, closing. This helps maintain more stable pressure in the refrigerant circuits.

[0067] Furthermore, according to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps:

[0068] When controlling any component to start up to its target state, if the component is already in the target state, the start-up of the component is skipped, and the component is controlled to continue working in the target state, and the next component is started.

[0069] Furthermore, according to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps:

[0070] When controlling any component to close, if the component has already been closed, skip closing the component, control the component to continue closing, and continue to close the next component.

[0071] It should be noted that when the thermal management system switches from the current operating mode to the target operating mode, the operating states of some components may remain unchanged. Therefore, there is no need to change the operating states of these components.

[0072] Furthermore, according to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps:

[0073] When controlling any component to turn on to its target state, if there is a component with a lower turn-on priority than that component in the turned-on state, the component with a lower turn-on priority than that component is first controlled to switch to a safe state, and then the component is controlled to turn on to its target state; the safe state of the compressor is the state when the speed is reduced to a preset speed or the state when the compressor is turned off.

[0074] For example, the safe state of any valve in the control valve group is the state when the valve opening is the preset opening or the state when the valve is closed. It should be noted that this embodiment does not limit the specific value of the preset opening and can be set according to needs.

[0075] When the control valve group is opened to its target state, if the compressor is in the on state, the speed of the compressor is first controlled to decrease to a preset speed. Of course, the compressor can also be controlled to be off, thereby avoiding the problem of excessive high pressure in the refrigerant circulation circuit when switching the working state of the control valve group, causing refrigerant leakage or damage to components in the refrigerant circulation circuit. After the control valve group is switched to its target state, the compressor is controlled to open to its target state.

[0076] When the expansion valve is controlled to open to its target state, if the compressor is in the on state, the speed of the compressor is first controlled to decrease to a preset speed. Of course, the compressor can also be controlled to be off, thereby avoiding the low pressure of the refrigerant circulation circuit being too low when the expansion valve is switched to its operating state. After the expansion valve is switched to its target state, the compressor is controlled to open to its target state.

[0077] Furthermore, according to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps:

[0078] When controlling any component to close, if there is a component with a higher closing priority than the component that is open, the component with a higher closing priority than the component that is closed will be closed first, and then the component that is controlled to close will be closed.

[0079] When the thermal management system switches from its current operating mode to its target operating mode, if multiple components need to be shut down, components with higher priority are shut down first, followed by components with lower priority. For example, if any refrigerant circuit needs to be disconnected, the remaining components in that circuit are shut down first, followed by the valves in the control valve group and the expansion valve in that circuit.

[0080] Optionally, the refrigerant circulation unit further includes a high-pressure fan arranged corresponding to the outdoor heat exchanger. The high-pressure fan can promote air circulation around the outdoor heat exchanger, which is beneficial to improving the working efficiency of the outdoor heat exchanger.

[0081] Furthermore, in the control priority, the high-pressure fan is started at a higher priority than the compressor. This arrangement can avoid starting the compressor first and then the high-pressure fan, which would cause the high-pressure pressure of the refrigerant circulation circuit to be too high.

[0082] The thermal management system of this embodiment further includes a controller, which is used to control the operation of the heat pump core, evaporator, outdoor heat exchanger, expansion valve and control valve group, and is also used to execute the thermal management system control method as described above.

[0083] The thermal management system of this embodiment also includes a memory. The controller, memory, heat pump core, evaporator, outdoor heat exchanger, expansion valve and control valve group in the vehicle can be connected through a bus or other means. Figure 2 The bus connection is taken as an example.

[0084] Memory, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the thermal management system control method in the aforementioned embodiment. The controller executes the software programs, instructions, and modules stored in the memory to perform various vehicle functions and data processing, thereby implementing the thermal management system control method in the aforementioned embodiment.

[0085] The memory primarily includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function; the data storage area can store data generated based on the terminal's use, etc. Furthermore, the memory can include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some examples, the memory may further include memory remotely located from the controller, which can be connected to the vehicle via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0086] This embodiment also provides a vehicle including the aforementioned thermal management system. This vehicle, based on the same inventive concept as the thermal management system provided in the aforementioned embodiment, can achieve the same beneficial effects as the thermal management system control method provided in the aforementioned embodiment by applying the thermal management system provided in the aforementioned embodiment. Technical details not fully described in this embodiment can be found in the specific processing details of the thermal management system control method provided in the aforementioned embodiment and will not be further elaborated here.

[0087] This embodiment further provides a storage medium storing a computer program. When the program is executed by a controller, the vehicle implements the thermal management system control method as described above.

[0088] Of course, the storage medium provided in this embodiment contains computer-executable instructions, and its computer-executable instructions are not limited to the operations in the thermal management system control method described above, but can also execute related operations in the thermal management system control method provided in this embodiment, and have corresponding functions and beneficial effects.

[0089] Through the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary general-purpose hardware, and of course it 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. The computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a robot, a personal computer, a server, or a network device, etc.) to execute the thermal management system control method described in each embodiment of the present invention.

[0090] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A thermal management system control method, wherein the thermal management system includes a refrigerant circulation unit, the refrigerant circulation unit including a compressor, a heat pump core, an evaporator, an outdoor heat exchanger, and a control valve group, the heat pump core, the evaporator, and the outdoor heat exchanger being connected via a plurality of refrigerant pipes, the control valve group being used to sequentially connect the heat pump core, the evaporator, and the outdoor heat exchanger in series, or to connect the heat pump core and the outdoor heat exchanger in series, or to connect the heat pump core and the evaporator in series, or to connect the heat pump core and the outdoor heat exchanger in series and the heat pump core and the evaporator in parallel, or to connect the evaporator and the outdoor heat exchanger in series to form a plurality of different refrigerant circulation loops, any of the refrigerant circulation loops being provided with an expansion valve, and the compressor being used to compress the refrigerant in any of the refrigerant circulation loops; It is characterized in that The thermal management system control method comprises the following steps: determining a target operating mode of the thermal management system; determining a target state of each component of the refrigerant cycle unit under the target operating mode; determining control priorities of various components of the refrigerant cycle unit according to the determined target state; In the control priority, the start-up priority of the control valve group and the expansion valve is higher than the start-up priority of the compressor, and in the same refrigerant circulation circuit, the closing priority of the control valve group and the expansion valve is the lowest; According to the control priority, each component of the refrigerant cycle unit is controlled to switch to the determined target state.

2. The thermal management system control method according to claim 1, characterized in that: Before determining the control priorities of the various components of the refrigerant cycle unit, the following steps are also included: determining a current operating mode of the thermal management system; Determining the current status of each component of the refrigerant cycle unit in the current operating mode; Determining the control priority of each component of the refrigerant cycle unit includes the following steps: According to the determined target state and the determined current state, control priorities of the respective components of the refrigeration cycle unit are determined.

3. The thermal management system control method according to claim 2, characterized in that: The plurality of refrigerant circulation circuits include a first refrigerant circulation circuit and a second refrigerant circulation circuit; Determining the control priority of each component of the refrigeration cycle unit according to the determined target state and the determined current state includes the following steps: When the current working mode is that the first refrigerant circulation circuit is working and the second refrigerant circulation circuit is working, and the target working mode is that the first refrigerant circulation circuit is not working and the second refrigerant circulation circuit is working, the compressor is first controlled to reduce the speed, and then the control valve group in the second refrigerant circulation circuit is controlled to open, and finally the control valve group in the first refrigerant circulation circuit is controlled to close.

4. The thermal management system control method according to claim 1, characterized in that: The refrigerant circulation unit further includes a high-pressure fan arranged corresponding to the outdoor heat exchanger; In the control priorities, the startup priority of the high-pressure fan is higher than the startup priority of the compressor.

5. The thermal management system control method according to claim 1, characterized in that: According to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps: When controlling any component to turn on to its target state, if there is a component with a lower turn-on priority than the component in the turned-on state, the component with a lower turn-on priority than the component is controlled to switch to a safe state first, and then the component is controlled to turn on to its target state; The safe state of the compressor is a state where the rotation speed is reduced to a preset rotation speed or a state where the compressor is turned off.

6. The thermal management system control method according to claim 1, characterized in that: According to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps: When controlling any component to close, if there is a component with a higher closing priority than the component that is open, the component with a higher closing priority than the component that is closed will be closed first, and then the component that is controlled to close will be closed.

7. The thermal management system control method according to claim 1, characterized in that: According to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps: When controlling any component to start up to its target state, if the component is already in the target state, the start-up of the component is skipped, and the component is controlled to continue working in the target state, and the next component is started; According to the control priority, controlling each component of the refrigerant cycle unit to switch to the determined target state includes the following steps: When controlling any component to close, if the component has already been closed, skip closing the component, control the component to continue closing, and continue to close the next component.

8. A thermal management system, characterized in that The system comprises a controller and a refrigerant circulation unit, wherein the refrigerant circulation unit comprises: A heat pump core, an evaporator and an outdoor heat exchanger, wherein the heat pump core, the evaporator and the outdoor heat exchanger are connected via a plurality of refrigerant pipes. a control valve group, the control valve group being used to connect the heat pump core, the evaporator, and the outdoor heat exchanger in series, or to connect the heat pump core and the outdoor heat exchanger in series, or to connect the heat pump core and the evaporator in series, or to connect the heat pump core and the outdoor heat exchanger in series and the heat pump core and the evaporator in parallel, or to connect the evaporator and the outdoor heat exchanger in series, so as to form a plurality of different refrigerant circulation circuits, each of the refrigerant circulation circuits being provided with an expansion valve; A compressor, which is used to compress the refrigerant in any of the refrigerant circulation loops. The controller is used to control the operation of the heat pump core, the evaporator, the outdoor heat exchanger, the expansion valve and the control valve group. The controller is also used to execute the thermal management system control method as described in any one of claims 1 to 7.

9. A vehicle, characterized in that Comprising the thermal management system of claim 8.

10. A storage medium having a computer program stored thereon, characterized in that When the program is executed by the controller, the vehicle implements the thermal management system control method according to any one of claims 1 to 7.

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