Control Method of Thermal Management System

Abstract

An embodiment of the present application provides a control method for a thermal management system. The control method includes: obtaining the ambient temperature and the target outlet air temperature, and controlling the operation mode of the thermal management system at least according to the ambient temperature and a preset first threshold, or at least according to the ambient temperature and a preset second threshold, or at least according to the target outlet air temperature, the ambient temperature, and a preset first temperature difference; wherein, the preset first threshold is greater than the preset second threshold. Compared with the related art, the stability of the system is improved.

Description

Technical Field

[0001] This application relates to the technical field of thermal management control, and particularly to a control method for a thermal management system. Background Art

[0002] Thermal management comfort refers to controlling the thermal management system to select corresponding operating modes under different environmental conditions to provide the outlet air temperature required by users. Due to the variability of the operating environment, the actual outlet air temperature of the thermal management system is often very complex under different environments to achieve the set temperature required by users.

[0003] In related technologies, the system presets a temperature point. When the ambient temperature is higher than the preset temperature point, the compressor and PTC auxiliary heating are operated, and the air damper is adjusted to reach the target outlet air temperature. When it is lower than the temperature point, the heating and dehumidification mode is operated, and the target outlet air temperature is achieved by turning the compressor on and off. The flexibility of the preset temperature point is relatively low, and the system will have the phenomenon of frequent switching of operating modes, resulting in poor system stability. Summary of the Invention

[0004] This application provides a control method for a thermal management system with relatively high stability.

[0005] On the one hand, this application provides a control method for a thermal management system. The control method is applied to the thermal management system, and the control method includes the following steps:

[0006] Obtain the ambient temperature and the target outlet air temperature of the thermal management system; control the operating mode of the thermal management system at least according to the ambient temperature and a preset first threshold, or at least according to the ambient temperature and a preset second threshold, or at least according to the target outlet air temperature, the ambient temperature, and a preset first temperature difference; wherein, the preset first threshold is greater than the preset second threshold.

[0007] In this application, at least according to the ambient temperature and the preset first threshold, or at least according to the ambient temperature and the preset second threshold, or at least according to the target outlet air temperature, the ambient temperature, and the preset first temperature difference, a suitable air conditioner operating mode is used to improve the phenomenon of frequent switching of the operating mode of the system, which is beneficial to improving the system stability. Brief Description of the Drawings

[0008] Figure 1 It is a schematic connection block diagram of an embodiment of the thermal management system of this application;

[0009] Figure 2 For example Figure 1 It is a schematic structural diagram of an embodiment of the thermal management device in the thermal management system as shown;

[0010] Figure 3Schematic diagram of the operation mode switching control logic in an embodiment of the thermal management system of the present application;

[0011] Figure 4 As shown in Figure 3 the schematic diagram of the operation mode switching control logic when the ambient temperature is greater than T1 in the shown schematic diagram;

[0012] Figure 5 Schematic diagram of the process of an embodiment of the control method of the thermal management system of the present application;

[0013] Figure 6 As shown in Figure 5 the schematic diagram of the processes of step S20 and step S30 in an embodiment of the control method of the thermal management system shown;

[0014] Figure 7 Schematic diagram of the processes of step S41 to step S43 in an embodiment of the control method of the thermal management system of the present application;

[0015] Figure 8 Schematic diagram of the processes of step S51 to step S53 in an embodiment of the control method of the thermal management system of the present application;

[0016] Figure 9 Schematic diagram of the processes of step S61 to step S63 in an embodiment of the control method of the thermal management system of the present application;

[0017] Figure 10 Schematic diagram of the processes of step S71 to step S73 in an embodiment of the control method of the thermal management system of the present application;

[0018] Figure 11 Schematic diagram of the process of another embodiment of the control method of the thermal management system of the present application;

[0019] Figure 12 As shown in Figure 11 the schematic diagram of the process of step S120 in an embodiment of the control method of the thermal management system shown;

[0020] Figure 13 Schematic diagram of the processes of step S131 to step S132 in an embodiment of the control method of the thermal management system of the present application. Detailed implementation manners

[0021] The terms used in the detailed implementation manners part of the present application are only for explaining the specific embodiments of the present application, rather than aiming to limit the present application.

[0022] The present application provides a control method for a thermal management system with relatively high stability.

[0023] As shown in Figure 1As shown in the figure, the thermal management system 100 includes a thermal management device 101 and a control device 102. The control device 102 is electrically connected to some components of the thermal management device 101, and the control device 102 controls the operating state of the thermal management device 101.

[0024] Optionally, the thermal management system 100 can be applied to vehicles, or indoors such as residences, garages, shopping malls, etc.

[0025] Taking the application of the above thermal management system 100 to a vehicle as an example, the thermal management system 100 includes a cabin 200, such as a passenger cabin, etc. The thermal management system 100 is used to meet the heating or cooling requirements on the cabin side. Refer to Figure 2 , in this embodiment, the thermal management device 101 includes a multi-way valve 10, an air outlet device 20, and a heat exchange device 30. The multi-way valve 10 is used to adjust the flow rate flowing into the air outlet device 20 and the flow rate flowing into the heat exchange device 30 (such as the flow rate of refrigerant or coolant, etc.). The outlet of the multi-way valve 10 is connected to at least one of the air outlet device 20 and the heat exchange device 30. The multi-way valve 10 is controlled by the control device 102 to adjust the opening ratio of the multi-way valve 10. The air outlet device 20 exchanges heat with the cabin 200, such as the refrigerant or coolant flowing into the air outlet device 20 exchanges heat with the cabin 200, etc., to meet the heating or cooling requirements on the cabin side. The heat exchange device 30 exchanges heat with the atmospheric environment, such as the refrigerant or coolant flowing into the heat exchange device 30 directly or indirectly exchanges heat with the atmospheric environment, etc., releases the excess heat (or energy) into the atmospheric environment (such as the vehicle exterior environment, etc.), or absorbs heat from the atmospheric environment.

[0026] It is worth mentioning that the control device 102 is electrically connected to the multi-way valve 10. By controlling the opening ratio of the multi-way valve 10, the control device 102 controls the proportion of the flow rate flowing to the air outlet device 20 in the total flow rate, so that when the rotational speed of the compressor cannot be further reduced, the heating or cooling requirements on the cabin side can be met without shutting down the compressor, which is beneficial to improving the system stability. The specific control method can refer to the description in the control method embodiment of this application.

[0027] The thermal management system 100 includes operating modes such as a heating mode, a heating and dehumidifying mode, and a cooling mode. The thermal management system 100 further includes a fluid switching device 40. The fluid switching device 40 is electrically connected to the control device 102 and is controlled by the control device 102 to control the switching of the working state of the fluid switching device 40, thereby switching the operating mode of the thermal management system 100. For example, the working state of the fluid switching device 40 can include a first working state and a second working state. In the first working state, the thermal management system 100 operates in the heating mode or the heating and dehumidifying mode. In the second working state, the thermal management system 100 operates in the cooling mode.

[0028] Refer to Figure 2, in this embodiment, the multi-way valve 10 includes a first multi-way valve 11 and a second multi-way valve 12, the air outlet device 20 includes a first heat exchanger 21 and a third heat exchanger 22, and the heat exchange device 30 includes a second heat exchanger 31 and a fourth heat exchanger 32. The thermal management device 101 further includes a first coolant system 50, a second coolant system 60, and a refrigerant system 70. Some components of the first coolant system 50 are electrically connected to the control device 102, and the control device 102 controls the operating state of the first coolant system to circulate the first coolant. Some components of the second coolant system 60 are electrically connected to the control device 102, and the control device 102 controls the operating state of the second coolant system 60 to circulate the second coolant. Some components of the refrigerant system 70 are electrically connected to the control device 102, and the control device 102 controls the operating state of the refrigerant system 70 to circulate the refrigerant (such as low-temperature or high-temperature refrigerant, etc.).

[0029] The first multi-way valve 11 is electrically connected to the control device 102 and is controlled by the control device 102 to adjust the flow rate flowing to the first heat exchanger 21 and the flow rate flowing to the second heat exchanger 31 (such as the first coolant flow rate). The first multi-way valve 11 can be selected as a three-way valve, with one inlet for introducing fluid, one outlet communicating with the first heat exchanger 21, and the other outlet communicating with the second heat exchanger 31. The second multi-way valve 12 is electrically connected to the control device 102 and is controlled by the control device 102 to adjust the flow rate flowing to the third heat exchanger 22 and the flow rate flowing to the fourth heat exchanger 32 (such as the refrigerant flow rate). The second multi-way valve 12 can be selected as a three-way valve, with one inlet for introducing another fluid, one outlet communicating with the third heat exchanger 22, and the other outlet communicating with the fourth heat exchanger 31.

[0030] In this embodiment, the first multi-way valve 11 and the first heat exchanger 21 are connected to the first coolant system 50. The internal flow channel of the first heat exchanger 21 circulates the first coolant, and one outlet of the first multi-way valve 11 communicates with the first heat exchanger 21. The first heat exchanger 21 is an air-cooled heat exchanger and is used as a warm air core. The first coolant flowing inside it can exchange heat with the air around its outer surface.

[0031] The internal flow channels of the third heat exchanger 22 are connected to the refrigerant system 70, and the refrigerant flows through the internal flow channels of the third heat exchanger 22. The third heat exchanger 22 serves as an indoor evaporator, and the refrigerant flowing inside exchanges heat with the air around its outer surface. Optionally, the third heat exchanger 22 is arranged on the upwind side of the first heat exchanger 21, and the air outlet device 20 is provided with a wind guiding device for guiding the air that has exchanged heat with the first heat exchanger 21 and the air that has exchanged heat with the third heat exchanger 22 into the cabin 200 (such as blowing air at a certain temperature into the cabin 200), so as to adjust the temperature inside the cabin 200. For example, in the heating and dehumidifying mode, the air first flows through the relatively low-temperature third heat exchanger 22 to complete dehumidification, and then the dehumidified dry air flows through the relatively high-temperature third heat exchanger 22 and is heated. The heated dry air enters the passenger cabin, realizing the heating and dehumidifying function.

[0032] The second heat exchanger 31 is a double-flow heat exchanger (such as a plate heat exchanger or a water-cooled heat exchanger, etc.), including a first heat exchange part and a second heat exchange part. The flow channels of the first heat exchange part are connected to the first coolant system 50 for flowing the first coolant, and the flow channels of the second heat exchange part are connected to the second coolant system 60 for flowing the second coolant. The second heat exchanger 31 is used for heat exchange between the first coolant and the second coolant. The fourth heat exchanger 32 is a double-flow heat exchanger, including a third heat exchange part and a fourth heat exchange part. The flow channels of the third heat exchange part are connected to the refrigerant system 70 for flowing the refrigerant, and the flow channels of the fourth heat exchange part are connected to the second coolant system 60 for flowing the second coolant. The fourth heat exchanger 32 is used for heat exchange between the refrigerant and the second coolant.

[0033] In this embodiment, the thermal management device 101 further includes a fifth heat exchanger 80. The fifth heat exchanger 80 is a double-flow heat exchanger, including a fifth heat exchange part and a sixth heat exchange part. The flow channels of the fifth heat exchange part are connected to the refrigerant system 70 for flowing the refrigerant, and the flow channels of the sixth heat exchange part are connected to the first coolant system 50 for flowing the first coolant. The fifth heat exchanger 80 is used for heat exchange between the first coolant and the refrigerant.

[0034] The first coolant system 50 further includes a fluid pump 51 and a heater. The fluid pump and the heater in the first coolant system 50 are electrically connected to the control device 102. The fluid pump 51 is used to provide the power to drive the first coolant to flow, and the heater is used to heat the first coolant.

[0035] The second coolant system 60 includes a low-temperature water tank 61, a motor 62, a battery 63, an inverter, etc. The low-temperature water tank 61 exchanges heat with the atmospheric environment. The motor 62, the battery 63, and the inverter in the second coolant system 60 are electrically connected to the control device 102. The second coolant system also includes a plurality of valve components that are electrically connected to the control device 102 and controlled by the control device 102. By regulating the working states of the plurality of valve components, the thermal management of heat-generating devices such as the motor 62, the battery 63, and the inverter can be achieved, thereby improving the performance of devices such as the motor 62, the battery 63, and the inverter. For example, the second coolant system 60 can exchange heat with the atmospheric environment through the low-temperature water tank 61 to dissipate heat from heat-generating devices such as the motor 62, the battery 63, and the inverter; it can also perform thermal management on heat-generating devices such as the motor 62, the battery 63, and the inverter through the second heat exchanger 31 or the fourth heat exchanger 32.

[0036] The refrigerant system 70 includes a compressor 71, a gas-liquid separator 72, an outdoor heat exchanger 73, a first flow regulating device 74, a second flow regulating device 75, and a third flow regulating device 76. In the refrigerant system 70, the compressor 71, the first flow regulating device 74, the second flow regulating device 75, and the third flow regulating device 76 are respectively electrically connected to the control device 102 and controlled by the control device 102. The compressor 71 compresses the refrigerant, the gas-liquid separator 72 separates the refrigerant into gas and liquid and discharges the gaseous refrigerant, and the refrigerant in the outdoor heat exchanger 73 exchanges heat with the atmospheric environment. The first flow regulating device 74 is used to regulate the refrigerant flowing through the outdoor heat exchanger 73 and has the functions of throttling, conducting, and shutting off. The second flow regulating device 75 is used to regulate the refrigerant flowing through the third heat exchanger 22 and has the functions of throttling and shutting off. The third flow regulating device 76 is used to regulate the refrigerant flowing through the fourth heat exchanger 32 and has the functions of throttling and shutting off.

[0037] Specifically, the following describes an exemplary process of the thermal management system 100 in different operating modes.

[0038] In the heating mode, the first flow regulating device 74 is in a throttling state, the second flow regulating device 75 is in a cut-off state, the third flow regulating device 76 is in a cut-off state, and the fluid switching device 40 is in the first working state. The compressor 71, the fifth heat exchange part of the fifth heat exchanger 80, the first flow regulating device 74, the outdoor heat exchanger 73, the gas-liquid separator 72, and the compressor 71 are connected in sequence to form a refrigerant circuit. The fluid pump 51, the first multi-way valve 11, the first heat exchanger 21, and the fluid pump 51 are connected in sequence to form a coolant circuit, and the fluid pump 51 is in a working state to provide power for the flow of the first coolant. The first heat exchanger 21 releases heat, and the air outlet device 20 outputs hot air to the cabin 200 to increase the temperature of the cabin 200. In the heating mode, by adjusting the first multi-way valve 11, part of the first coolant can flow through the first heat exchange part of the second heat exchanger 31, release heat to the atmospheric environment through the second heat exchanger 31, or perform heat exchange with the second coolant in the second coolant system 60 through the second heat exchanger 31 to dissipate the heat to the atmospheric environment, or perform thermal management on heat-generating devices such as the motor 62, the battery 63, and the inverter, etc.

[0039] In the heating and dehumidifying mode, the first flow regulating device 74 is in a throttling state, the second flow regulating device 75 is in a throttling state, the third flow regulating device 76 is in a cut-off state, and the fluid switching device 40 is in the first working state. The compressor 71, the fifth heat exchange part of the fifth heat exchanger 80, the first flow regulating device 74, the outdoor heat exchanger 73, the gas-liquid separator 72, and the compressor 71 are connected in sequence to form a refrigerant circuit, and the compressor 71, the fifth heat exchange part of the fifth heat exchanger 80, the second multi-way valve 12, the second flow regulating device 75, the third heat exchanger 22, the gas-liquid separator 72, and the compressor 71 are connected in sequence to form a refrigerant circuit. The fluid pump 51, the first multi-way valve 11, the first heat exchanger 21, and the fluid pump 51 are connected in sequence to form a coolant circuit, and the fluid pump 51 is in a working state to provide power for the flow of the first coolant. In the air outlet device 20, the air first flows through the relatively low-temperature third heat exchanger 22 for dehumidification, and then flows through the first heat exchanger 21 to be heated, so as to achieve the function of heating and dehumidifying. At this time, the air outlet device 20 outputs dry hot air to the cabin 200 to increase the temperature of the cabin 200. In the heating and dehumidifying mode, by adjusting the first multi-way valve 11, part of the first coolant can flow through the second heat exchanger 31, release heat to the atmospheric environment through the second heat exchanger 31, or perform heat exchange with the second coolant in the second coolant system 60 through the second heat exchanger 31 to dissipate the heat to the atmospheric environment, or perform thermal management on heat-generating devices such as the motor 62, the battery 63, and the inverter, etc.

[0040] In the heating mode and the heating and dehumidifying mode, by using the first multi-way valve 11 for diversion, part of the heat is released into the atmospheric environment (or part of the heat is transferred to heat-generating devices such as the motor 62, the battery 63, and the inverter), so as to adjust the heat supplied to the cabin side. This adjustment method can meet the heating demand of the cabin side without shutting down the compressor when the rotational speed of the compressor cannot be further reduced, thus improving the stability of the system.

[0041] In the cooling mode, the fluid pump 51 stops working, the first flow regulating device 74 is in the conducting state, the second flow regulating device 75 is in the throttling state, and the fluid switching device 40 is in the second working state. The compressor 71, the fifth heat exchange part of the fifth heat exchanger 80, the first flow regulating device 74, the outdoor heat exchanger 73, the second flow regulating device 75, the third heat exchanger 22, the gas-liquid separator 72, and the compressor 71 are sequentially connected to form a refrigerant circuit. The third heat exchanger 22 absorbs heat, and the air outlet device 20 outputs cold air to the cabin 200 to reduce the temperature of the cabin 200. In the cooling mode, by adjusting the second multi-way valve 12, part of the refrigerant flows through the third heat exchange part of the fourth heat exchanger 32, and the third flow regulating device 76 is in the throttling state. Heat is exchanged with the atmospheric environment through the fourth heat exchanger 32, or heat exchange is performed with the second coolant in the second coolant system 60 through the fourth heat exchanger 32, so as to dissipate heat into the atmospheric environment, or perform thermal management on heat-generating devices such as the motor 62, the battery 63, and the inverter. In some other embodiments, the second multi-way valve 12 may not be provided, and the flow is directly adjusted through the second flow regulating device 75 and the third flow regulating device 76; or the second flow regulating device 75 and the third flow regulating device 76 may not be provided, but an expansion valve is provided in front of the inlet of the second multi-way valve 12 to achieve the throttling and cut-off functions.

[0042] In the cooling mode, by using the second multi-way valve 12 for diversion, part of the refrigerant flows through the third heat exchange part of the fourth heat exchanger 32, and the refrigerant flow rate flowing to the third heat exchanger 22 is adjusted, so as to adjust the cooling effect on the cabin side. This adjustment method can meet the cooling demand of the cabin side without shutting down the compressor when the rotational speed of the compressor 71 cannot be further reduced, thus improving the stability of the system.

[0043] The control device 102 controls the opening ratios of the first multi-way valve 11 and the second multi-way valve 12. In this embodiment, the opening ratio of the first multi-way valve 11 is the proportion of the flow rate flowing to the first heat exchanger 21 in the total flow rate of the first coolant. For example, when the opening ratio of the first multi-way valve 21 is 100%, it means that all of the first coolant flows to the first heat exchanger 21. When the opening ratio of the first multi-way valve 11 is 0, it means that all of the first coolant flows to the second heat exchanger 31. The opening ratio of the second multi-way valve 12 is the proportion of the flow rate flowing to the third heat exchanger 22 in the flow rate at the inlet of the second multi-way valve 12. For example, when the opening ratio of the second multi-way valve 12 is 100%, it means that all of the refrigerant flowing through the second multi-way valve 12 flows to the third heat exchanger 22. In some other embodiments, the opening ratio of the first multi-way valve 11 can also be the proportion of the flow rate flowing to the second heat exchanger 31 in the total flow rate of the first coolant; the opening ratio of the second multi-way valve 12 is the proportion of the flow rate flowing to the fourth heat exchanger 32 in the flow rate at the inlet of the second multi-way valve 12.

[0044] The thermal management system 100 may further include a plurality of sensors, such as a sensor provided at the outlet of the air outlet device 20, a sensor C1 provided at the outlet of the compressor 71, a sensor C2 provided at the outdoor heat exchanger port, a sensor C3, a sensor C4 provided at the outlet of the third heat exchanger 22, etc. The above-mentioned plurality of sensors are all electrically connected to the control device 102 to send the detected temperature signals to the control device 102, so that the control device 102 can more accurately judge the working states of each component.

[0045] The control device 102 in the embodiment of the present application can be any device with acquisition and operation capabilities. For example, it can be a computer terminal, an industrial control computer, etc. The control device 102 can acquire the operation mode of the thermal management device 101, and the control device 102 can send corresponding control signals to at least one component in the thermal management device 101 to control the working states of the corresponding components.

[0046] The embodiment of the present application also provides a control method for a thermal management system, which can be applied to the example of the thermal management device 101 provided above. Figure 2 The control device 102 executes the control method. The specific implementation manners of the thermal management device 101 will not be elaborated here and can be referred to the description of the thermal management device 101 above.

[0047] The control method of the thermal management system 100 provided by the embodiment of the present application will be described in detail below. Specifically, as Figure 3 、 Figure 4 and Figure 5 shown, the method includes the following steps:

[0048] S10. Obtain the ambient temperature and the target air outlet temperature;

[0049] S11. Select, at least based on the ambient temperature and a preset first threshold T1, to control the operation mode of the thermal management system 100 at least based on the ambient temperature and a preset second threshold T2, or at least based on the target air outlet temperature, the ambient temperature, and a preset first temperature difference ΔT1. Wherein, the preset first threshold T1 is greater than the preset second threshold T2.

[0050] The ambient temperature is the outside atmospheric environment temperature of the vehicle, which can be collected by a temperature sensor disposed at any position of the vehicle head, the rearview mirror, or the vehicle body. The target air outlet temperature is the temperature to be achieved at the air outlet of the air outlet device 20, or the temperature to be achieved by the air blown into the cabin 200 by the air outlet device 20, which can be obtained according to the temperature preset by the user. For example, the user operates the control panel of the thermal management system 100 to input the required air outlet temperature, and then obtains the target air outlet temperature according to the input required air outlet temperature.

[0051] It should be noted that in other embodiments, the operation mode of the thermal management system 100 can also be controlled according to the ambient humidity, the ambient wind speed, the ambient sunlight intensity, etc. The specific implementation method can refer to the principle or function of the above step S11 and is not limited herein.

[0052] Specifically, step S11 includes the following steps:

[0053] S12. Determine whether the ambient temperature is less than the preset first threshold T1, and control one of the heating mode, the cooling mode, and the heating and dehumidifying mode of the thermal management system 100 to operate.

[0054] Specifically, when the ambient temperature is less than or equal to the preset first threshold T1, step S20 is executed; when the ambient temperature is greater than the preset first threshold T1, step S30 is executed.

[0055] S20: Control the thermal management system 100 to operate in the heating mode or the heating and dehumidifying mode at least according to the magnitude relationship between the ambient temperature and the preset second threshold T2;

[0056] S30: Control the thermal management system 100 to operate in the cooling mode or the heating and dehumidifying mode at least according to the magnitude relationship between the difference between the target air outlet temperature and the ambient temperature and the preset first temperature difference ΔT1.

[0057] Compared with the related art, in the control method of the present application, the environmental temperature is divided into intervals. When the environmental temperature is relatively low (such as lower than T1), the operating mode of the thermal management system 100 is determined according to the magnitude relationship between the environmental temperature and the preset second threshold T2. When the environmental temperature is relatively high (such as higher than T1), the operating mode of the thermal management system 100 is determined according to the magnitude relationship between the difference between the target outlet air temperature and the environmental temperature and the preset first temperature difference △T1. Therefore, the accuracy of controlling the operating mode of the thermal management system 100 is improved, the phenomenon of frequent switching of the operating mode of the thermal management system is improved, and the system stability is improved.

[0058] As Figure 6 shown, step S20 includes the following steps:

[0059] S21. Determine whether the environmental temperature is greater than the preset second threshold T2;

[0060] When the environmental temperature is less than or equal to the preset first threshold T1 and greater than the preset second threshold T2, step S22 is executed; when the environmental temperature is less than or equal to the preset second threshold T2, step S23 is executed.

[0061] S22: Control the thermal management system 100 to operate in the heating and dehumidifying mode.

[0062] S23: Control the thermal management system 100 to operate in the heating mode.

[0063] If the environmental temperature is lower than the preset second threshold T2, it means that the environmental temperature is too low and the users in the cabin 200 have a heating demand, then control the thermal management system 100 to operate in the heating mode. If the environmental temperature is higher than the preset second threshold T2 and lower than the preset first threshold T1, it means that the environmental temperature is relatively higher, but the users in the cabin 200 also have a heating demand. At this time, control the thermal management system 100 to operate in the heating and dehumidifying mode, which can meet the heating demand of the users and at the same time have a dehumidifying effect to prevent fogging in the cabin 200.

[0064] If the environmental temperature is higher than the preset first threshold T1, it means that the environmental temperature is relatively high, some users in the cabin 200 have a heating demand, while other users have a cooling demand. At this time, the specific operating mode of the thermal management system 100 is highly relevant to the needs of the users, and further judgment can be made according to the difference between the target outlet air temperature set by the users and the environmental temperature.

[0065] Further, as Figure 6 shown, step S30 includes:

[0066] S31. Determine whether the difference between the target outlet air temperature and the environmental temperature is greater than the preset first temperature difference △T1;

[0067] When the difference between the target outlet air temperature and the ambient temperature is less than or equal to the preset first temperature difference △T1, step S22 is executed; when the difference between the target outlet air temperature and the ambient temperature is less than or equal to the preset first temperature difference △T1, step S32 is executed.

[0068] S32: Control the thermal management system 100 to operate in the refrigeration mode.

[0069] That is to say, if the ambient temperature is higher than T1 and the difference between the target outlet air temperature and the ambient temperature is greater than △T1, it means that the user in the cabin 200 has a heating demand. However, since the ambient temperature is relatively high at this time, only by controlling the thermal management system 100 to operate in the heating and dehumidifying mode can the heating demand of the user in the cabin 200 be met. If the ambient temperature is higher than T1 and the difference between the target outlet air temperature and the ambient temperature is less than △T1, it means that the user in the cabin 200 has a refrigeration demand, and it is necessary to control the thermal management system 100 to operate in the refrigeration mode.

[0070] As Figure 7 shown, after determining the operating mode of the thermal management system 100 according to the above steps, the method further includes the following steps:

[0071] S41. The thermal management system 100 operates in the heating mode;

[0072] S42. Determine whether the ambient temperature is greater than the preset third threshold T3;

[0073] When it is detected that the ambient temperature is greater than the preset third threshold, step S43 is executed; otherwise, the thermal management system 100 continues to operate in the heating mode. Specifically, step S43 is: the operating mode of the thermal management system 100 is switched to the heating and dehumidifying mode.

[0074] As Figure 8 shown, the method further includes the following steps:

[0075] S51. The thermal management system 100 operates in the heating and dehumidifying mode;

[0076] S52. Determine whether the ambient temperature is less than the preset second threshold T2;

[0077] When it is detected that the ambient temperature is less than the preset second threshold T2, step S53 is executed; otherwise, the thermal management system 100 continues to operate in the heating and dehumidifying mode; specifically, step S53 is: the operating mode of the thermal management system 100 is switched to the heating mode.

[0078] In this embodiment, the preset third threshold T3 is greater than the preset second threshold T2, and the preset third threshold T3 is less than the preset first threshold T1.

[0079] As Figure 9 shown, the method further includes the following steps:

[0080] S61. The thermal management system 100 operates in the refrigeration mode;

[0081] S62. Determine whether the difference between the target outlet air temperature and the ambient temperature is greater than a preset first temperature difference ΔT1;

[0082] When it is detected that the difference between the target outlet air temperature and the ambient temperature is greater than the preset first temperature difference ΔT1, step S63 is executed; otherwise, the thermal management system 100 continues to operate in the refrigeration mode. Specifically, step S63 is: the operating mode of the thermal management system 100 is switched to the heating and dehumidifying mode.

[0083] As Figure 10 shown, the method further includes the following steps:

[0084] S71. The thermal management system 100 operates in the heating and dehumidifying mode;

[0085] S72. Determine whether the difference between the target outlet air temperature and the ambient temperature is less than a preset second temperature difference ΔT2;

[0086] When it is detected that the difference between the target outlet air temperature and the ambient temperature is less than the preset second temperature difference ΔT2, step S73 is executed; otherwise, the thermal management system 100 continues to operate in the heating and dehumidifying mode. Specifically, step S73 is: the operating mode of the thermal management system 100 is switched to the refrigeration mode.

[0087] In this embodiment, the preset first temperature difference ΔT1 is greater than the preset second temperature difference ΔT2.

[0088] In the method of this application, when the ambient temperature is less than or equal to T1, a buffer interval for the thermal management system 100 to switch between the heating mode and the heating and dehumidifying mode is reserved. When the ambient temperature is greater than T1, a buffer interval for the thermal management system 100 to switch between the refrigeration mode and the heating and dehumidifying mode is reserved, avoiding frequent switching of the operating mode of the system due to a single preset temperature point of the system, which is beneficial to improving the system stability.

[0089] In another embodiment of this application, a control method for the thermal management system 100 is further provided. As Figure 11 shown, the control method includes:

[0090] S110. Obtain the target outlet air temperature and the current outlet air temperature;

[0091] S120. Control the opening ratio of the multi-way valve 10 at least according to the current outlet air temperature and the target outlet air temperature, so as to control the proportion of the fluid flowing into the outlet device 20 and the heat exchange device 30.

[0092] The current outlet air temperature is the temperature at the outlet of the air outlet device 20, or the temperature of the air blown into the cabin 200 by the air outlet device 20, which can be collected by a temperature sensor disposed at the outlet of the air outlet device 20.

[0093] In steps S110 and S120, the target outlet air temperature required by the user is compared with the current outlet air temperature of the air outlet device 20, and the opening ratio of the multi-way valve is controlled according to the comparison result to control the flow rate flowing to the air outlet device 20, so as to adjust the air temperature blown into the cabin 200 by the air outlet device 20 by regulating the flow rate flowing through the air outlet device 20.

[0094] As Figure 12 shown, step S120 includes the following steps:

[0095] S121: Run the heating mode or the heating and dehumidifying mode;

[0096] S122: Determine whether the current outlet air temperature is less than or equal to the target outlet air temperature;

[0097] If the current outlet air temperature is less than or equal to the target outlet air temperature, execute step S123; if the current outlet air temperature is greater than the target outlet air temperature, execute step 124.

[0098] S123: Control the opening ratio of the first multi-way valve 11 to remain unchanged (for example, control the opening ratio of the first multi-way valve 11 to be 100%), and adjust the rotation speed of the compressor 71;

[0099] S124: Determine whether the rotation speed of the compressor 71 is greater than the minimum rotation speed;

[0100] If the rotation speed of the compressor 71 is greater than the minimum rotation speed, execute step 125; if the rotation speed of the compressor 71 is less than or equal to the minimum rotation speed, execute step 126.

[0101] S125: Control the opening ratio of the first multi-way valve 11 to remain unchanged, and reduce the rotation speed of the compressor 71;

[0102] S126: Control the rotation speed of the compressor 71 to maintain the minimum rotation speed, and adjust (for example, reduce) the opening ratio of the first multi-way valve 11.

[0103] That is to say, when the thermal management system 100 operates in the heating mode or the heating and dehumidifying mode, if the current outlet air temperature is lower than the target outlet air temperature, at this time, the heating demand on the cabin side is not met, then the opening ratio of the first multi-way valve 11 is controlled to remain at the maximum value (or 100%), so that all the first coolant flows into the first heat exchanger 21 of the air outlet device 20 for heat exchange with the cabin 200. At the same time, the rotational speed of the compressor 71 is adjusted (such as increasing the rotational speed of the compressor 71), so that the current outlet air temperature of the air outlet device 20 rises to reach the target outlet air temperature and meet the heating demand on the cabin side.

[0104] If the current outlet air temperature is higher than the target outlet air temperature and it is detected that the rotational speed of the compressor 71 has not been reduced to the minimum rotational speed, then the opening ratio of the first multi-way valve 11 is controlled to remain at the maximum value, so that all the first coolant flows into the first heat exchanger of the air outlet device 20 for heat exchange with the cabin 20. At the same time, by reducing the rotational speed of the compressor 71, the current outlet air temperature of the air outlet device 20 is reduced to reach the target outlet air temperature and meet the heating demand on the cabin side.

[0105] In the above two cases, the outlet air temperature of the air outlet device 20 can be adjusted by regulating the rotational speed of the compressor 71. At this time, the opening ratio of the first multi-way valve 11 is controlled to be the maximum value, which can prevent part of the heat from being dissipated into the atmospheric environment and causing energy waste.

[0106] It can be understood that the compressor 71 of the thermal management system 100 has a minimum rotational speed. When the thermal management system 100 starts each time, the thermal management system 100 first heats or cools with a suitable power and maximum air volume (at this time, the rotational speed of the compressor 71 is relatively high), so that the current outlet air temperature quickly approaches the target outlet air temperature. When the current outlet air temperature is quickly approaching the target outlet air temperature (such as the temperature difference is less than or equal to the preset value), the rotational speed of the compressor 71 gradually decreases. After the current outlet air temperature approaches the target outlet air temperature, the compressor 71 reaches the minimum rotational speed and maintains operation at the minimum rotational speed, so that the current outlet air temperature is maintained at the target outlet air temperature, making the temperature fluctuation smaller and reducing energy consumption at the same time.

[0107] In the related art, when the thermal management system 100 operates in the heating mode or the heating and dehumidifying mode, if the current outlet air temperature is still higher than the target outlet air temperature after the compressor 71 reaches the minimum rotational speed, then the compressor 71 is turned off to reduce the current outlet air temperature of the air outlet device 20, thereby reducing the temperature inside the cabin 200. Then, when the current outlet air temperature of the air outlet device 20 (or the temperature inside the cabin 200) is lower than the target outlet air temperature, the compressor 71 is turned on again to increase the temperature inside the cabin 200 again to meet the heating demand on the cabin side. Therefore, in the related art, the compressor 71 is prone to frequent start-stop phenomena and is easily damaged.

[0108] In the embodiment of this method, if the rotational speed of the compressor 71 has been reduced to the lowest rotational speed or is lower than the lowest rotational speed, and the current outlet air temperature is still higher than the target outlet air temperature, then control the rotational speed of the compressor 71 to maintain the lowest rotational speed, and at the same time reduce the opening ratio of the first multi-way valve 11, so that part of the coolant flows into the second heat exchanger 31 of the heat exchange device 30, so that part of the heat is released to the atmospheric environment, reducing the coolant flow rate flowing into the first heat exchanger 21 of the air outlet device 20, so that the current outlet air temperature of the air outlet device 20 is reduced to reach the target outlet air temperature. Thus, when the rotational speed of the compressor 71 cannot be further reduced, the compressor 11 does not need to be turned off to meet the heating demand on the cabin side, which is beneficial to improving the system stability and avoiding damage to the compressor 71, etc.

[0109] In one possible implementation, as Figure 13 shown, step S120 further includes:

[0110] S131: Run the refrigeration mode;

[0111] S132: Determine whether the current outlet air temperature is greater than the target outlet air temperature;

[0112] When the current outlet air temperature is greater than the target outlet air temperature, then execute step S133; if the current outlet air temperature is less than or equal to the target outlet air temperature, then execute step S134.

[0113] S133: Control the opening ratio of the second multi-way valve 12 to remain unchanged and adjust the rotational speed of the compressor 71;

[0114] S134: Determine whether the rotational speed of the compressor 71 is greater than the lowest rotational speed;

[0115] If the rotational speed of the compressor 71 is less than or equal to the lowest rotational speed, then execute step S135; if the rotational speed of the compressor is greater than the lowest rotational speed, then execute step S136.

[0116] S135: Control the opening ratio of the second multi-way valve 12 to remain unchanged and reduce the rotational speed of the compressor 71;

[0117] S136: Control the rotational speed of the compressor 71 to maintain the lowest rotational speed and adjust (such as reduce) the opening ratio of the second multi-way valve 12.

[0118] That is to say, when the thermal management system 100 runs in the refrigeration mode, if the current outlet air temperature is higher than the target outlet air temperature, then control the opening ratio of the second multi-way valve 12 to remain at the maximum value (or 100%), so that all the refrigerant flows into the third heat exchanger 22 of the air outlet device 20 for heat exchange with the cabin 20, and at the same time adjust the rotational speed of the compressor 71 (such as increasing the rotational speed of the compressor 71, etc.), so that the current outlet air temperature of the air outlet device 20 is reduced to reach the target outlet air temperature to meet the refrigeration demand of the users on the cabin side.

[0119] If the current outlet air temperature is lower than the target outlet air temperature and it is detected that the rotational speed of the compressor 71 has not been reduced to the lowest rotational speed, then control the opening ratio of the second multi-way valve 12 to the maximum value, so that all the refrigerant flows into the third heat exchanger 22 of the air outlet device 20 to exchange heat with the cabin body 200. At the same time, by reducing the rotational speed of the compressor 71, the current outlet air temperature of the air outlet device 20 is increased to reach the target outlet air temperature, so as to meet the refrigeration requirements of the users on the cabin body side.

[0120] If the rotational speed of the compressor 71 has been reduced to the lowest rotational speed or is lower than the lowest rotational speed, and the current outlet air temperature is still lower than the target outlet air temperature, then control the rotational speed of the compressor 71 to maintain the lowest rotational speed. At the same time, reduce the opening ratio of the second multi-way valve 12, so that part of the coolant flows into the fourth heat exchanger 32 of the heat exchange device 30 to exchange heat with the atmospheric environment, reducing the refrigerant flow rate flowing into the third heat exchanger 22 of the air outlet device 20, so that the current outlet air temperature of the air outlet device 20 is increased to reach the target outlet air temperature. Thus, when the rotational speed of the compressor 71 cannot be further reduced, the compressor 71 does not need to be turned off to meet the refrigeration requirements on the cabin body side, which is beneficial to improving the system stability and avoiding damage to the compressor 71, etc.

[0121] Optionally, the control method of the thermal management system 100 described in this embodiment can be applied after the operation mode of the thermal management system 100 is determined in the previous embodiment, that is, after steps S22, S23 and S32, judge the target outlet air temperature and the current outlet air temperature, and adjust the opening ratio of the multi-way valve according to the judgment result to control the proportion of the flow rate flowing to the air outlet device 20 in the total flow rate. It can meet the heating or refrigeration requirements on the cabin body side without turning off the compressor 71 when the rotational speed of the compressor 71 cannot be further reduced, improve the problems of oil return and high energy consumption caused by the frequent start and stop of the compressor 71, and can also improve the stability of the system.

[0122] In the embodiment of the present application, the control device 102 of the thermal management system 100 includes: an acquisition module for acquiring the target outlet air temperature and the ambient temperature; a processing module for controlling the operation mode of the thermal management system 100 according to the magnitude relationship between the target outlet air temperature and the current outlet air temperature.

[0123] Further, the acquisition module is further used for acquiring the current outlet air temperature; the processing module is further used for controlling the opening ratio of the multi-way valve 10 according to the magnitude relationship between the target outlet air temperature and the current outlet air temperature to adjust the flow rate flowing through the air outlet device 20. In this embodiment, the opening ratio of the multi-way valve 10 is the proportion of the flow rate flowing to the air outlet device 20 in the total flow rate.

[0124] In this embodiment, the acquisition module and the processing module are electrically connected for performing the above Figure 5 or Figure 11For the provided control method, the specific steps or principles can be referred to the description of the control method, which will not be elaborated here.

[0125] It should be understood that in this application, obtaining a certain stage result according to parameter A and parameter B means that when obtaining a certain stage result, at least parameter A and parameter B are used, but other parameters can also be used to obtain this stage result. For example, controlling the opening ratio of the multi-way valve according to the current outlet air temperature and the target outlet air temperature means controlling the opening ratio of the multi-way valve based on at least the current outlet air temperature and the target outlet air temperature.

[0126] It should be understood that the division of each module of the above-mentioned heat management system shown in the figure is only a logical function division. When implemented, it can be fully or partially integrated into a physical entity, or physically separated. And these modules can all be implemented in the form of software called by processing elements; they can also all be implemented in the form of hardware; or some modules can be implemented in the form of software called by processing elements, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or can be integrated in a certain chip of the heat management system. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together or can be independently implemented. During the implementation process, each step of the above method or each of the above modules can be completed by the hardware integrated logic circuit or software-form instructions in the processor element.

[0127] For example, the above-mentioned modules can be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC for short), or, one or more digital signal processors (DSP for short), or, one or more field programmable gate arrays (FPGA for short), etc. Again, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC for short).

[0128] In the above embodiments, the involved processor may include, for example, a CPU, a DSP, a microcontroller or a digital signal processor, and may also include a GPU, an embedded neural-network processor (hereinafter referred to as: NPU) and an image signal processor (hereinafter referred to as: ISP). The processor may further include necessary hardware accelerators or logic processing hardware circuits, such as an ASIC, or one or more integrated circuits for controlling the execution of the technical solution program of the present application. In addition, the processor may have the function of operating one or more software programs, and the software programs may be stored in a storage medium.

[0129] The embodiments of the present application further provide a computer-readable storage medium, in which a computer program is stored. When it runs on a computer, it causes the computer to execute the present application Figure 5 or Figure 11 the method provided by the illustrated embodiment.

[0130] The embodiments of the present application further provide a computer program product, which includes a computer program. When it runs on a computer, it causes the computer to execute the present application Figure 5 or Figure 11 the method provided by the illustrated embodiment.

[0131] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent the cases of A existing alone, A and B existing simultaneously, and B existing alone. Where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0132] Those of ordinary skill in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be implemented by a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0133] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0134] In several embodiments provided by the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the related technology, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (hereinafter referred to as ROM), random access memories (hereinafter referred to as RAM), magnetic disks, or optical discs that can store program codes.

[0135] The above is only the specific implementation manner of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application and should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. A control method for a thermal management system, characterized in that, The control method is applied to a thermal management system, and the control method includes the following steps: Obtain the ambient temperature and the target outlet air temperature of the thermal management system; Control the operation mode of the thermal management system at least according to the ambient temperature and a preset first threshold, at least according to the ambient temperature and a preset second threshold, or at least according to the target outlet air temperature, the ambient temperature, and a preset first temperature difference; wherein, the preset first threshold is greater than the preset second threshold; The thermal management system includes a multi-way valve, an air outlet device, and a heat exchange device, and the control method further includes the following steps: Operate the thermal management system, which is used to adjust the temperature of the cabin. The outlet of the multi-way valve is connected to at least one of the air outlet device and the heat exchange device. The air outlet device exchanges heat with the cabin, and the heat exchange device exchanges heat with the atmospheric environment; Obtain the current outlet air temperature of the air outlet device; control the opening ratio of the multi-way valve at least according to the current outlet air temperature and the target outlet air temperature, so as to control the ratio of the fluid flowing into the air outlet device and the heat exchange device; In the step of operating the thermal management system, which is used to adjust the temperature of the cabin. The outlet of the multi-way valve is connected to at least one of the air outlet device and the heat exchange device. The air outlet device exchanges heat with the cabin, and the heat exchange device exchanges heat with the atmospheric environment: The thermal management system further includes a compressor and a fluid driving device. The multi-way valve includes a first multi-way valve and a second multi-way valve. The air outlet device includes a first heat exchanger and a third heat exchanger. The heat exchange device includes a second heat exchanger and a fourth heat exchanger. The third heat exchanger is arranged on the upstream side of the first heat exchanger. The fluid driving device drives the fluid to flow in at least one of the first multi-way valve, the first heat exchanger, and the second heat exchanger. The compressor drives another fluid to flow in at least one of the second multi-way valve, the third heat exchanger, and the fourth heat exchanger. At least one of the first heat exchanger and the third heat exchanger exchanges heat with the cabin, and at least one of the second heat exchanger and the fourth heat exchanger exchanges heat with the atmospheric environment; The first multi-way valve controls the ratio of the fluid flowing into the first heat exchanger and the fluid flowing into the second heat exchanger, and the second multi-way valve controls the ratio of the other fluid flowing into the third heat exchanger and the other fluid flowing into the fourth heat exchanger.

2. The control method according to claim 1, characterized in that In the step of controlling the operation mode of the thermal management system at least according to the ambient temperature and a preset first threshold, at least according to the ambient temperature and a preset second threshold, or at least according to the target outlet air temperature, the ambient temperature, and a preset first temperature difference, the following steps are included: When the ambient temperature is less than or equal to the preset first threshold, control the operation mode of the thermal management system at least according to the ambient temperature and the preset second threshold; When the ambient temperature is greater than the preset first threshold, control the operation mode of the thermal management system at least according to the difference between the target outlet air temperature and the ambient temperature and the preset first temperature difference.

3. The control method according to claim 2, wherein The operating modes of the thermal management system include a heating mode and a heating and dehumidifying mode. In the step of controlling the operating mode of the thermal management system based at least on the ambient temperature and the preset second threshold when the ambient temperature is less than or equal to the preset first threshold, the following steps are included: When the ambient temperature is less than or equal to the preset first threshold and greater than the preset second threshold, control the thermal management system to operate in the heating and dehumidifying mode; When the ambient temperature is less than or equal to the preset second threshold, control the thermal management system to operate in the heating mode.

4. The control method according to claim 3, characterized in that After controlling the thermal management system to operate in the heating and dehumidifying mode or the heating mode, the method further includes the following steps: If the thermal management system operates in the heating mode and the detected ambient temperature is greater than the preset third threshold, then control the thermal management system to switch to the heating and dehumidifying mode; If the thermal management system operates in the heating and dehumidifying mode and the detected ambient temperature is less than the preset second threshold, then control the thermal management system to switch to the heating mode; The preset third threshold is greater than the preset second threshold, and the preset third threshold is less than the preset first threshold.

5. The control method according to claim 2, wherein The operating modes of the thermal management system include a heating and dehumidifying mode and a cooling mode; In the step of controlling the operating mode of the thermal management system based at least on the difference between the target air outlet temperature and the ambient temperature and the preset first temperature difference when the ambient temperature is greater than the preset first threshold, the following steps are included: When the ambient temperature is greater than the preset first threshold and the difference between the target air outlet temperature and the ambient temperature is greater than the preset first temperature difference, control the thermal management system to operate in the heating and dehumidifying mode; When the ambient temperature is greater than the preset first threshold and the difference between the target air outlet temperature and the ambient temperature is less than or equal to the preset first temperature difference, control the thermal management system to operate in the cooling mode.

6. The control method according to claim 5, wherein After controlling the thermal management system to operate in the heating and dehumidifying mode or the cooling mode, the method further includes the following steps: If the thermal management system operates in the cooling mode and the detected difference between the target air outlet temperature and the ambient temperature is greater than the preset first temperature difference, then control the thermal management system to switch to the heating and dehumidifying mode; If the thermal management system operates in the heating and dehumidifying mode and the detected difference between the target air outlet temperature and the ambient temperature is less than the preset second temperature difference, then control the thermal management system to switch to the cooling mode; Wherein, the preset first temperature difference is greater than the preset second temperature difference.

7. The control method according to claim 1, characterized in that The operating modes of the thermal management system include a heating mode and a heating and dehumidifying mode. When the thermal management system operates in the heating mode or the heating and dehumidifying mode, in the step of controlling the opening ratio of the multi-way valve based at least on the current air outlet temperature and the target air outlet temperature, so as to control the proportion of the fluid flowing into the air outlet device and the heat exchange device, the following steps are included: When the current air outlet temperature is less than or equal to the target air outlet temperature, control the opening ratio of the first multi-way valve to remain unchanged and adjust the rotation speed of the compressor; When the current outlet air temperature is greater than the target outlet air temperature and the rotational speed of the compressor is greater than the minimum rotational speed, keep the opening ratio of the first multi-way valve unchanged and reduce the rotational speed of the compressor. When the current outlet air temperature is greater than the target outlet air temperature, if it is detected that the rotational speed of the compressor is less than or equal to the minimum rotational speed, keep the rotational speed of the compressor at the minimum rotational speed, adjust the opening ratio of the first multi-way valve, and reduce the flow rate flowing to the first heat exchanger.

8. The control method according to claim 1, wherein The operating mode of the thermal management system includes a refrigeration mode. When the thermal management system operates in the refrigeration mode, in the step of controlling the opening ratio of the multi-way valve at least according to the current outlet air temperature and the target outlet air temperature so as to control the ratio of the fluid flowing into the outlet device and the heat exchange device, the following steps are included: When the current outlet air temperature is greater than the target outlet air temperature, keep the opening ratio of the second multi-way valve unchanged and adjust the rotational speed of the compressor. When the current outlet air temperature is less than or equal to the target outlet air temperature and the rotational speed of the compressor is greater than the minimum rotational speed, keep the opening ratio of the second multi-way valve unchanged and reduce the rotational speed of the compressor. When the current outlet air temperature is less than or equal to the target outlet air temperature, if it is detected that the rotational speed of the compressor is less than or equal to the minimum rotational speed, keep the rotational speed of the compressor at the minimum rotational speed, adjust the opening ratio of the second multi-way valve, and reduce the flow rate flowing to the third heat exchanger.

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