CN114734782A

CN114734782A - Control method of thermal management system

Info

Publication number: CN114734782A
Application number: CN202210437727.0A
Authority: CN
Inventors: 王冬丽
Original assignee: Hangzhou Lvneng New Energy Auto Parts Co ltd
Current assignee: Hangzhou Lvneng New Energy Auto Parts Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-07-12
Anticipated expiration: 2042-04-25
Also published as: CN114734782B

Abstract

The application discloses a control method of a thermal management system, which comprises the following steps: if the first heat exchanger is in a frosting critical state, the second throttling device is opened to be in a throttling state, the heat management system operates in a second working mode, the compressor, the first throttling device, the first heat exchanger, the second throttling device and the first heat exchange portion of the second heat exchanger circulate refrigerant, the second heat exchange portion of the second heat exchanger circulates cooling liquid, and the refrigerant in the first heat exchange portion exchanges heat with the cooling liquid in the second heat exchange portion. The heat exchange at the first heat exchanger is reduced, so that the first heat exchanger is delayed or prevented from entering a frosting state, the compressor is delayed to enter or does not enter a shutdown protection state, the air outlet temperature cannot rise or rise unobviously, and the problem of peculiar smell in the air outlet of the compressor in the shutdown protection state is solved.

Description

Control method of thermal management system

Technical Field

The present application relates to the field of thermal management technologies, and in particular, to a control method for a thermal management system.

Background

When the air conditioning system operates in a refrigeration working condition, the indoor evaporator is in a low-temperature state, the surface temperature of the indoor evaporator is lower than the dew point temperature of air, water vapor in the air can be condensed into water drops when flowing through the surface of the indoor evaporator, and the indoor evaporator can be in a wet state. The indoor evaporator is in a relatively closed environment, water drops on the surface of the indoor evaporator are difficult to volatilize by natural air drying and are easy to breed bacteria and mildew after a long time. If the compressor is stopped, the temperature of the outlet air rises, and the outlet air has peculiar smell.

In the related art, if the indoor evaporator is used for more than a certain time, after the air conditioning system stops operating, the blower is forcibly started to blow air to the indoor evaporator, so that the evaporation of the surface moisture of the indoor evaporator is accelerated. However, when the ambient temperature is not high and the requirement of the passenger compartment for refrigeration load is relatively low, the evaporation temperature of the indoor evaporator is lower than the frosting protection value, at the moment, the compressor can be stopped for protection, the air outlet temperature of the air conditioning box is increased, so that peculiar smell is obvious, and under the condition, a mode of forcibly opening the air blower to blow air to accelerate the evaporation of surface moisture cannot be adopted.

Disclosure of Invention

In view of the above problems in the related art, the present application provides a control method for a thermal management system that improves the problem of abnormal odor in the outlet air in the shutdown protection state of the compressor.

In order to achieve the purpose, the following technical scheme is adopted in the application: a control method of a thermal management system comprises a compressor, a first heat exchanger, a first throttling device, a second heat exchanger and a second throttling device, wherein the second heat exchanger comprises a first heat exchanging part and a second heat exchanging part; the control method comprises the following steps:

the heat management system operates in a first working mode, the first throttling device is in a throttling state, the second throttling device is in a cut-off state, the compressor, the first throttling device and the first heat exchanger circulate refrigerants, and the first heat exchanger absorbs heat;

if the first heat exchanger is in a frosting critical state, the second throttling device is opened to be in a throttling state, the heat management system operates in a second working mode, the compressor, the first throttling device, the first heat exchanger, the second throttling device and a first heat exchange portion of the second heat exchanger circulate refrigerant, a second heat exchange portion of the second heat exchanger circulates cooling liquid, and the refrigerant in the first heat exchange portion exchanges heat with the cooling liquid in the second heat exchange portion.

In this application, when the thermal management system operated first mode, if first heat exchanger was in the critical state that frosts, through opening second throttling arrangement, the thermal management system operated in second mode, make the refrigerant in the first heat transfer portion carry out the heat exchange with the coolant liquid of second heat transfer portion, reduce the heat exchange of first heat exchanger department, thereby it gets into the state of frosting to delay or avoided first heat exchanger, make the compressor delay to get into or not get into the shutdown protection state, the air-out temperature can not rise or rise unobviously, it has the peculiar smell problem to improve the air-out under the compressor shutdown protection state.

Drawings

FIG. 1 is a schematic diagram of a connection block diagram of one embodiment of a thermal management system of the present application;

FIG. 2 is a schematic diagram of an embodiment of a thermal management device in the thermal management system of FIG. 1;

FIG. 3 is a schematic flow chart diagram illustrating one embodiment of a method for controlling a thermal management system according to the present application;

FIG. 4 is a schematic flow chart diagram illustrating another embodiment of a method for controlling a thermal management system according to the present application;

FIG. 5 is a schematic flow chart diagram illustrating a control method of the thermal management system of the present application in accordance with another embodiment;

FIG. 6 is a schematic flow chart diagram illustrating a method for controlling a thermal management system according to yet another embodiment of the present application;

FIG. 7 is another flow chart diagram of a control method of the thermal management system shown in FIG. 6;

FIG. 8 is a schematic flow chart illustrating one embodiment of determining whether the first heat exchanger is in a critical frosting condition before the heat pipe system operates in the second operating mode;

FIG. 9 is a schematic flow chart illustrating one embodiment of determining whether the battery pack is in a low temperature protection state before the heat pipe system operates in the second operating mode;

FIG. 10 is a schematic flow chart diagram illustrating one embodiment of determining whether the first heat exchanger is in a critical frosting condition after the heat pipe system operates in the second operating mode;

fig. 11 is a flowchart illustrating an embodiment of determining whether the battery assembly is in a low-temperature protection state after the heat pipe system operates in the second operating mode.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The heat exchanger according to the exemplary embodiment of the present application will be described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments can be supplemented or combined with each other without conflict.

The application provides a control method applied to a thermal management system. As shown in fig. 1, 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 operation state of the thermal management device 101. Alternatively, the thermal management system 100 may be applied to a vehicle, or indoors such as in a home, garage, mall, etc.

Taking the above-mentioned thermal management system 100 as an example of a vehicle, the thermal management system 100 includes a cabin 200, such as a passenger cabin, and the thermal management system 100 is used to satisfy the heating or cooling requirement of the cabin side.

Referring to fig. 2, in the present embodiment, the thermal management device 101 includes a second cooling liquid system 50, a first cooling liquid system 60, and a refrigerant system 70, some components of the second cooling liquid system 50 are electrically connected to a control device 102, and the control device 102 controls an operation state of the second cooling liquid system 50 to circulate the second cooling liquid. Some components of the first cooling liquid system 60 are electrically connected to the control device 102, and the control device 102 controls the operation state of the first cooling liquid system 60 to circulate the first cooling liquid. Some components of the refrigerant system 70 are electrically connected to the control device 102, and the control device 102 controls the operation state of the refrigerant system 70 to circulate refrigerant (e.g., low-temperature or high-temperature refrigerant, etc.). The second cooling fluid system 50, the first cooling fluid system 60, and the refrigerant system 70 are not in communication with each other.

The heat management device 101 comprises a multi-way valve 10, an air outlet device 20 and a heat exchange device 30. The multi-way valve 10 is used for adjusting 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 cooling liquid), and the outlet of the multi-way valve 10 is communicated with at least one of the air outlet device 20 and the heat exchange device 30. The multi-way valve 10 is controlled by a 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, for example, the refrigerant or the cooling liquid flowing into the air outlet device 20 exchanges heat with the cabin 200, and the like, so as to meet the heating or cooling requirement of the cabin side. The heat exchanging device 30 exchanges heat with the first coolant system 60, for example, the refrigerant or coolant flowing into the heat exchanging device 30 exchanges heat with the first coolant system 60, etc., so as to meet the heating or cooling requirements of the components of the first coolant system 60, or exchange heat with the atmospheric environment.

The control device 102 is electrically connected with the multi-way valve 10, and the control device 102 controls the proportion of the flow flowing to the air outlet device 20 in the total flow by controlling the opening proportion of the multi-way valve 10, so that the heating requirement or the refrigerating requirement on the cabin side can be met under the condition of not closing the compressor when the rotating speed of the compressor can not be reduced, and the stability of the system is favorably improved.

Referring to fig. 2, in the present 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 third heat exchanger 21 and a first heat exchanger 22, and the heat exchange device 30 includes a fourth heat exchanger 31 and a second heat exchanger 32. The first multi-way valve 11 is electrically connected to the control device 102 and controlled by the control device 102, and is configured to adjust a flow rate (e.g., a first coolant flow rate) flowing to the third heat exchanger 21 and a flow rate (e.g., a first coolant flow rate) flowing to the fourth heat exchanger 31, where the first multi-way valve 11 may be a three-way valve, one inlet is used for introducing a fluid, one outlet is communicated with the third heat exchanger 21, and the other outlet is communicated with the fourth heat exchanger 31. The second multi-way valve 12 is electrically connected to the control device 102 and controlled by the control device 102, and is configured to regulate a flow (such as a refrigerant flow) to the first heat exchanger 22 and a flow (such as a refrigerant flow) to the second heat exchanger 32, where the second multi-way valve 12 may be a three-way valve, one inlet is used for introducing another fluid, one outlet is communicated with the first heat exchanger 22, and the other outlet is communicated with the fourth heat exchanger 31.

In this embodiment, the first multi-way valve 11 and the third heat exchanger 21 are connected to the second coolant system 50, the second coolant flows through the internal flow path of the third heat exchanger 21, and one outlet of the first multi-way valve 11 communicates with the third heat exchanger 21. The third heat exchanger 21 is an air-cooled heat exchanger and serves as a heater core, and the first coolant flowing inside the third heat exchanger can exchange heat with air around the outer surface.

The internal flow path of the first heat exchanger 22 communicates with the refrigerant system 70, and the internal flow path of the first heat exchanger 22 circulates refrigerant. The first heat exchanger 22 functions as an indoor evaporator, and refrigerant flowing inside thereof exchanges heat with air around the outer surface. Alternatively, the first heat exchanger 22 is disposed on the upstream side of the third heat exchanger 21, and the air outlet device 20 is provided with an air guiding device for guiding the air after heat exchange with the third heat exchanger 21 and the air after heat exchange with the first heat exchanger 22 to be blown into the cabin 200 (for example, to blow air with a certain temperature into the cabin 200), so as to adjust the temperature in the cabin 200. For example, in the heating and dehumidifying mode, air firstly passes through the first heat exchanger 22 with a lower temperature to perform dehumidification, then the dehumidified dry air passes through the first heat exchanger 22 with a higher temperature to be heated, and the heated dry air enters the passenger compartment to perform the heating and dehumidifying function.

The fourth heat exchanger 31 is a dual-channel heat exchanger (such as a plate heat exchanger or a water-cooled heat exchanger), the fourth heat exchanger 31 includes a third heat exchanging portion and a fourth heat exchanging portion, a channel of the third heat exchanging portion is communicated with the second coolant system 50 for circulating the second coolant, a channel of the fourth heat exchanging portion is communicated with the first coolant system 60 for circulating the first coolant, and the fourth heat exchanger 31 is used for heat exchange between the first coolant and the second coolant. The second heat exchanger 32 is a double-channel heat exchanger (such as a plate heat exchanger or a water-cooled heat exchanger), the second heat exchanger 32 includes a first heat exchanging portion and a second heat exchanging portion, a channel of the first heat exchanging portion is communicated with the refrigerant system 70 for circulating the refrigerant, a channel of the second heat exchanging portion is communicated with the first cooling liquid system 60 for circulating the first cooling liquid, and the second heat exchanger 32 is used for heat exchange between the refrigerant and the first cooling liquid.

In this embodiment, the thermal management device 101 further includes a fifth heat exchanger 80, the fifth heat exchanger 80 is a dual-channel heat exchanger (such as a plate heat exchanger or a water-cooled heat exchanger), the fifth heat exchanger 80 includes a fifth heat exchanging portion and a sixth heat exchanging portion, a channel of the fifth heat exchanging portion is communicated with the refrigerant system 70 and is used for circulating the refrigerant, a channel of the sixth heat exchanging portion is communicated with the second cooling liquid system 50 and is used for circulating the second cooling liquid, and the fifth heat exchanger 80 is used for heat exchange between the second cooling liquid and the refrigerant.

The second coolant system 50 also includes a fluid pump 51 and a heater. The fluid pump 51 and the heater of the second coolant system 50 are electrically connected to the control device 102. The fluid pump 51 is used for providing power for driving the flow of the second cooling liquid, and the heater is used for heating the second cooling liquid.

The first cooling liquid system 60 further includes a low-temperature water tank 61, a motor assembly 62, a battery assembly 63, an inverter, and the like, the low-temperature water tank 61 exchanges heat with the atmospheric environment, and the motor assembly 62, the battery assembly 63, and the inverter in the first cooling liquid system 60 are electrically connected to the control device 102. The first cooling liquid system 60 further includes a plurality of valve elements electrically connected to the control device 102 and controlled by the control device 102, and by regulating and controlling the operating states of the plurality of valve elements, thermal management of the motor assembly 62, the battery assembly 63, and the inverter and other heat generating devices can be achieved, so that the performance of the motor assembly 62, the battery assembly 63, and the inverter and other devices can be improved. For example, the first 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 module 62, the battery module 63, and the inverter; the heat generating devices such as the motor module 62, the battery module 63, and the inverter can be thermally managed by the fourth heat exchanger 31 or the second heat exchanger 32.

The refrigerant system 70 further includes a compressor 71, a gas-liquid separator 72, an outdoor heat exchanger 73, a third throttling device 74, a first throttling device 75, and a second throttling device 76. The compressor 71, the third throttling device 74, the first throttling device 75 and the second throttling device 76 of the refrigerant system 70 are electrically connected with a control device 102 respectively, and are 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 exchanges heat with the atmosphere in the outdoor heat exchanger 73. The first throttling device 75 is used for regulating the refrigerant flowing through the first heat exchanger 22, and has the functions of throttling and stopping. The second throttling device 76 is used for regulating the refrigerant flowing through the second heat exchanger 32, and has the functions of throttling and stopping. The third throttling device 74 is used for regulating the refrigerant flowing through the outdoor heat exchanger 73, and has functions of throttling, conducting and stopping.

In some other embodiments, the refrigerant system 70 is not provided with the gas-liquid separator 72, and the compressor 71 has a gas-liquid separation function. In some other embodiments, the second multi-way valve 12 may not be provided, and the flow rate adjustment is performed directly by the first throttling device 75 and the second throttling device 76; it is also possible to dispense with the first throttle device 75 and the second throttle device 76, but to provide a throttle device for the throttling and shut-off function upstream of the inlet of the second multi-way valve 12.

The thermal management system 100 has a heating mode, a cooling mode, a heating and dehumidifying mode, and a second operating mode. In this embodiment, 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 the fluid switching device 40 is controlled by the control device 102 to switch the operating state of the fluid switching device 40, so as to switch the operating mode of the thermal management system 100. The operation states of the fluid switching device 40 may include a first operation state in which the thermal management system 100 operates in a heating mode or a heating and dehumidifying mode, and a second operation state in which the thermal management system 100 operates in a cooling mode.

It should be understood that the second operation mode in this application is an operation mode for intermediate transition, and the second operation mode is switched from the first operation mode, and the first operation mode is one of a cooling mode or a heating and dehumidifying mode. When the transition state is over, the thermal management system switches back to the working mode before the transition according to the instruction or switches to a new working mode specified by the instruction. Therefore, the operating state of the fluid switching device 40 in the second operating mode is determined by the operating mode before switching to the second operating mode. It can be understood that, if the heating and dehumidifying mode is switched to the second operation mode, the fluid switching device 40 in the second operation mode is in the first operation state; if the cooling mode is switched to the second operation mode, the fluid switching device 40 in the second operation mode is in the second operation state. In some other embodiments, thermal management system 100 operates in a heating mode with fluid switching device 40 in a first operating state; the thermal management system 100 operates in the first operating mode, and the fluid switching device 40 is in the second operating state, which can be designed according to different systems, and the present application is not limited thereto.

Specifically, the following describes an exemplary process of the thermal management system 100 of the present embodiment in different operating modes.

In the heating mode, the third throttling means 74 is in the throttling state, the first throttling means 75 is in the cut-off state, the second throttling means 76 is in the cut-off state, and the fluid switching device 40 is in the first operating state. The compressor 71, the fifth heat exchanging portion of the fifth heat exchanger 80, the third throttling device 74, the outdoor heat exchanger 73, the gas-liquid separator 72, and the compressor 71 are sequentially communicated to form a refrigerant circuit. The fluid pump 51, the first multi-way valve 11, the third heat exchanger 21 and the fluid pump 51 are communicated in sequence to form a cooling liquid loop, and the fluid pump 51 is in a working state to provide power for the flow of the second cooling liquid. The third heat exchanger 21 releases heat, and the air outlet device 20 outputs hot air to the cabin 200 for increasing the temperature of the cabin 200.

In the heating and dehumidifying mode, the third throttling device 74 is in a throttling state, the first throttling device 75 is in a throttling state, the second throttling device 76 is in a cut-off state, and the fluid switching device 40 is in a first working state. The compressor 71, the fifth heat exchanging portion of the fifth heat exchanger 80, the third throttling device 74, the outdoor heat exchanger 73, the gas-liquid separator 72, and the compressor 71 are sequentially communicated to form a refrigerant circuit, and the compressor 71, the fifth heat exchanging portion of the fifth heat exchanger 80, the second multi-way valve 12, the first throttling device 75, the first heat exchanger 22, the gas-liquid separator 72, and the compressor 71 are sequentially communicated to form a refrigerant circuit. The fluid pump 51, the first multi-way valve 11, the third heat exchanger 21 and the fluid pump 51 are communicated in sequence to form a cooling liquid loop, and the fluid pump 51 is in a working state to provide power for the flow of the second cooling liquid. In the air outlet device 20, air firstly flows through the first heat exchanger 22 with lower temperature for dehumidification, and then flows through the third heat exchanger 21 for heating, thereby realizing the heating and dehumidifying functions, and at this time, the air outlet device 20 outputs dry hot air to the cabin 200 for increasing the temperature of the cabin 200.

In the heating mode and the heating and dehumidifying mode, by adjusting the first multi-way valve 11, a part of the first coolant may flow through the third heat exchanging portion of the fourth heat exchanger 31, and exchange heat with the first coolant in the first coolant system 60 through the fourth heat exchanger 31, the atmospheric environment, or perform heat management on heat generating equipment such as the motor assembly 62, the battery assembly 63, and the inverter.

In the cooling mode, the fluid pump 51 is stopped, the third throttling device 74 is in the on state, the first throttling device 75 is in the throttling state, the second throttling device 76 is in the off state, and the fluid switching device 40 is in the second operating state. The compressor 71, the fifth heat exchanging portion of the fifth heat exchanger 80, the third throttling device 74, the outdoor heat exchanger 73, the first throttling device 75, the first heat exchanger 22, the gas-liquid separator 72, and the compressor 71 are sequentially communicated to form a refrigerant circuit. The first 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, a part of the refrigerant may flow through the first heat exchanging portion of the second heat exchanger 32 by using the second multi-way valve 12 for diversion, and the second throttling device 76 is in a throttling state, and exchanges heat with the first coolant in the first coolant system 60 through the second heat exchanger 32, exchanges heat with the atmospheric environment, or thermally manages heat generating devices such as the motor assembly 62, the battery assembly 63, and the inverter.

In the related art, the thermal management system operates in a cooling mode or a heating and dehumidifying mode, when the ambient temperature is not high and the demand for cooling load of the passenger compartment is relatively low, the evaporation temperature of the first heat exchanger 22 is low, and if the evaporation temperature of the first heat exchanger 22 is lower than the frosting protection value, the first heat exchanger 22 enters a frosting critical state, and at this time, the first heat exchanger 22 has a frosting risk. In order to prevent the first heat exchanger 22 from frosting, the rotation speed of the compressor 71 is reduced, but in order to protect the compressor 71, when the rotation speed of the compressor 71 is reduced to the minimum rotation speed, the rotation speed cannot be reduced any more, and the compressor 71 is stopped for a while and enters a stop protection state. Because the compressor 71 is shut down, the temperature of the outlet air device 20 will rise, resulting in a more obvious peculiar smell of the outlet air.

In this application, can switch the thermal management system to the second mode of operation when compressor 71 need get into the shutdown protection state, make compressor 71 not shut down, avoid compressor 71 to get into the shutdown protection state for the air-out temperature of air-out device 20 does not rise or rises unobviously, thereby improves the air-out and has the peculiar smell problem under the compressor 71 shutdown protection state. It should be understood that the cooling mode or the heating and dehumidifying mode can be switched to the second operation mode on the premise that the second throttle device 76 is in the off state. If the second throttling device 76 is in the throttling state in the cooling mode or the heating and dehumidifying mode, the mode of switching to the second working mode cannot be used, and the problem of peculiar smell of outlet air in the shutdown protection state of the compressor 71 is solved.

The cooling mode or the heating and dehumidifying mode is switched to the second working mode, and the second throttling device 76 is started by the heat management system in the original working mode state, so that all the refrigerant which originally flows through the first heat exchanger 22 is shunted to the second heat exchanger 32, and a part of cooling capacity is shared by the first cooling liquid system 60 and is transmitted to the atmosphere, or heating equipment such as the motor assembly 62, the battery assembly 63 and an inverter are used, so that the refrigerant which flows through the first heat exchanger 22 is reduced, the evaporation temperature of the first heat exchanger 22 is increased, and the first heat exchanger 22 is prevented from entering a frosting critical state. At this time, the compressor 71 is not stopped, and the temperature of the outlet air device 20 is not increased or is not obviously increased, so that the problem of peculiar smell in the outlet air under the stop protection state of the compressor 71 is solved.

The control device 102 controls the opening ratio of the first and second multi-way valves 11 and 12. In the present embodiment, the opening ratio of the first multi-way valve 11 is a ratio of the flow rate flowing through the third heat exchanger 21 to the total flow rate of the second cooling liquid. For example, the opening ratio of the first multi-way valve 11 is 100%, which means that the second cooling liquid flows all the way to the third heat exchanger 21. The opening ratio of the first multi-way valve 11 is 0, and means that the second cooling liquid flows to the fourth heat exchanger 31 in its entirety. The opening ratio of the second multi-way valve 12 is a ratio of the flow rate to the first heat exchanger 22 in the flow rate at the inlet of the second multi-way valve 12. For example, the opening ratio of the second multi-way valve 12 is 100%, which means that all of the refrigerant having passed through the second multi-way valve 12 flows to the first heat exchanger 22. In some other embodiments, the opening ratio of the first multi-way valve 11 can also be the ratio of the flow rate to the fourth heat exchanger 31 to the total flow rate of the second cooling liquid; the opening ratio of the second multi-way valve 12 is a ratio of the flow rate to the second heat exchanger 32 to the flow rate at the inlet of the second multi-way valve 12.

The thermal management system 100 may further include a plurality of sensors, such as a sensor disposed at an outlet of the air outlet device 20, a sensor C1 disposed at an outlet of the compressor 71, a sensor C2 and a sensor C3 disposed at a port of the outdoor heat exchanger, and a sensor C4 disposed at an outlet of the first heat exchanger 22, where the plurality of sensors are all electrically connected to the control device 102 to send a detected temperature signal to the control device 102, so that the control device 102 can determine the operating state of each component accurately.

The control device 102 in the embodiment of the present application may be any device having acquiring and computing capabilities, for example, a computer terminal, an industrial personal computer, or the like, the control device 102 may acquire an operating mode of the thermal management device 101, and the control device 102 may send a corresponding control signal to at least one component in the thermal management device 101 to control an operating state of the corresponding component.

The present application also provides a control method of a thermal management system, which may be applied to the example of the thermal management device 101 provided in fig. 2, where the control device 102 executes the control method, and a specific implementation of the thermal management device 101 is not described herein again, and reference may be made to the above description of the thermal management device 101.

An embodiment of a control method of the thermal management system 100 of the present application is described below, and as shown in fig. 3, the control method of the present embodiment includes the following steps:

s2: and selecting to execute the step S3 or continue to execute the step S1 according to whether the first heat exchanger 22 is in the frost critical state or not. Step S1 is executed by the thermal management system 100 in the first operating mode; step S3 is to open the second throttle 76 in the throttling state and the thermal management system 100 operates in the second operating mode.

The control method is applicable to a state where the thermal management system 100 is operating in a cooling mode or a heating and dehumidifying mode. Specifically, in the first operating mode of the thermal management system 100, if the first heat exchanger 22 is in the frosting critical state, the thermal management system 100 switches to the second operating mode; otherwise, the thermal management system 100 continues to operate the first operating mode, i.e., continues to operate the cooling mode or the heating and dehumidifying mode.

The first heat exchanger 22 is in a frosting critical state, which indicates that the first heat exchanger 22 has a frosting risk, and at this time, the thermal management system 100 switches to the second operating mode, so that the frosting risk of the first heat exchanger 22 is reduced in a state that the compressor 71 is not stopped. The first heat exchanger 22 is not in a frost critical state, i.e., there is no risk of frost formation in the first heat exchanger 22, indicating that the thermal management system 100 may continue to operate in the cooling mode or the heating and dehumidifying mode. It should be understood that the thermal management system 100 continues to operate in the cooling mode or the heating and dehumidifying mode, and does not mean that the thermal management system 100 selects one of the cooling mode and the heating and dehumidifying mode to operate, but means that the thermal management system continues to operate in the original operating mode. For example, before step S2 is executed, the thermal management system 100 operates the cooling mode, and at this time, the cooling mode continues to be operated without switching the operation mode.

In order to improve the stability of the system, it is necessary to determine whether the second throttle device 76 is in the off state before step S3 is executed, and if the second throttle device 76 is in the off state, step S3 or S2 is executed; otherwise, the process continues to step S1.

As shown in fig. 4, after determining that the thermal management system 100 operates in the second operating mode according to the above steps, the control method further includes the following steps:

s5: and selecting to execute the step S6 or continue to execute the step S3 according to whether the first heat exchanger 22 is in the frosting critical state and whether the thermal management system 100 is switched to other working modes. Step S6 exits the second operating mode for the thermal management system 100.

Specifically, when the thermal management system 100 operates in the second operating mode, if the first heat exchanger 22 is in a frosting critical state and the thermal management system 100 is not switched to another operating mode, the thermal management system 100 continues to operate in the second operating mode; otherwise, thermal management system 100 exits the second mode of operation.

The manner in which thermal management system 100 exits the second mode of operation includes: if the first heat exchanger 22 is not in the frosting critical state, the thermal management system 100 switches to the working mode before entering the second working mode; if the thermal management system 100 switches to another operating mode, the thermal management system 100 switches to a new operating mode.

To improve system energy efficiency, step S4 is performed during the second mode of operation performed by thermal management system 100. Step S4 is to adjust the opening degree of the second throttle device 76 so that the real-time rotation speed of the compressor 71 is equal to the minimum rotation speed. Specifically, when the first heat exchanger 22 is in the frosting critical state, the rotation speed of the compressor 71 may be greater than the minimum rotation speed, and reducing the rotation speed of the compressor 71 at this time may delay the first heat exchanger 22 from entering the frosting state, and the lower the rotation speed of the compressor 71, the more energy is saved, so that the rotation speed of the compressor 71 may be reduced to and maintained at the minimum rotation speed, thereby achieving the purpose of saving energy. If the rotational speed of the compressor 71 has become equal to the minimum rotational speed, the minimum rotational speed is continuously maintained.

As shown in fig. 7, before the thermal management system 100 operates in the second operation mode in step S2, determining whether the first heat exchanger 22 is in the frosting critical state includes the following steps:

s221: one of the steps S222 and S224 is selectively performed according to the relationship between the evaporation temperature of the first heat exchanger 22 and the first preset temperature.

Specifically, if the evaporation temperature of the first heat exchanger 22 is less than or equal to the first preset temperature, step S222 is executed; if the evaporation temperature of the first heat exchanger 22 is greater than the first preset temperature, step S224 is executed.

S222: one of the steps S223 and S224 is selectively performed according to a relationship between a duration of time for which the evaporation temperature of the first heat exchanger 22 is less than or equal to the first preset temperature and the first preset time.

Specifically, if the duration of the evaporation temperature of the first heat exchanger 22 being less than or equal to the first preset temperature is greater than the first preset time, step S223 is executed; otherwise, step S224 is executed.

S223: the first heat exchanger 22 is in a frost critical state. That is, a signal that the first heat exchanger 22 is in the frost critical state is output.

S224: the first heat exchanger 22 is not in a frost critical state. That is, a signal that the first heat exchanger 22 is not in the frost critical state is output.

When the evaporation temperature of the first heat exchanger 22 is less than or equal to the first preset temperature, it cannot be directly determined that the first heat exchanger 22 is in the frosting critical state, and when the duration time of the state is greater than the first preset time, it is determined that the first heat exchanger 22 is in the frosting critical state. When the duration of this state is less than or equal to the first preset time, it indicates that the first heat exchanger 22 is not at risk of frosting.

As shown in fig. 9, after the thermal management system 100 operates in the second operation mode in step S5, determining whether the first heat exchanger 22 is in the frosting critical state includes the following steps:

s511: and one of the steps S512 and S514 is selected and executed according to the relation between the evaporation temperature of the first heat exchanger 22 and the second preset temperature.

Specifically, if the evaporation temperature of the first heat exchanger 22 is greater than the second preset temperature, step S512 is executed; if the evaporation temperature of the first heat exchanger 22 is less than or equal to the second preset temperature, step S514 is executed.

S512: one of the steps S513 and S514 is selectively executed according to the relationship between the duration that the evaporating temperature of the first heat exchanger 22 is greater than the second preset temperature and the second preset time.

Specifically, if the duration that the evaporation temperature of the first heat exchanger 22 is greater than the second preset temperature is greater than or equal to the second preset time, step S513 is executed; otherwise, step S514 is executed.

S513: the first heat exchanger 22 is not in a frost critical state. That is, a signal that the first heat exchanger 22 is not in the frost critical state is output.

S514: the first heat exchanger 22 is in a frost critical state. That is, a signal that the first heat exchanger 22 is in the frost critical state is output.

Similarly, when the evaporation temperature of the first heat exchanger 22 is greater than the second preset temperature, the duration of the state needs to be further determined, and when the duration of the state is greater than or equal to the second preset time, it is determined that the first heat exchanger 22 is not in the frosting critical state. When the duration of this state is less than or equal to the second preset time, it indicates that the first heat exchanger 22 still has a frost risk.

The present application also provides another embodiment of a control method of the thermal management system 100, as shown in fig. 5, the present embodiment is different from the previous embodiment in that: step S2 is different from step S5, and the differences will be described below, and the same reference is made to the related description of the previous embodiment.

Step S2 of the control method of the present embodiment includes: and selecting to execute the step S3 or continue to execute the step S1 according to the relation between the real-time rotating speed and the lowest rotating speed of the compressor 71 and whether the first heat exchanger 22 is in the frosting critical state.

Specifically, in the first operating mode of the thermal management system 100, if the first heat exchanger 22 is in the frosting critical state and the real-time rotation speed of the compressor 71 is less than or equal to the minimum rotation speed, the thermal management system 100 switches to the second operating mode; otherwise, thermal management system 100 continues to operate in the first mode of operation.

The first heat exchanger 22 is in the frosting critical state, and the real-time rotating speed of the compressor 71 is less than or equal to the lowest rotating speed, which indicates that the first heat exchanger 22 has a frosting risk and the rotating speed of the compressor 71 cannot be reduced any more, at this time, the thermal management system 100 is switched to the second working mode, so that the frosting risk of the first heat exchanger 22 is reduced under the state that the compressor 71 is not shut down. The first heat exchanger 22 is not in a frost critical state, i.e., there is no risk of frost formation in the first heat exchanger 22, indicating that the thermal management system 100 may continue to operate in the cooling mode or the heating and dehumidifying mode. The real-time rotation speed of the compressor 71 is greater than the minimum rotation speed, which indicates that the frosting risk of the first heat exchanger 22 can be reduced by reducing the rotation speed of the compressor 71, and the compressor 71 does not need to be switched to the second working mode, maintain the original working mode unchanged, and reduce the rotation speed of the compressor 71.

In this embodiment, referring to fig. 5, the determination of the relationship between the real-time rotation speed and the minimum rotation speed of the compressor 71 and the determination of whether or not the first heat exchanger 22 is in the frost formation critical state are performed simultaneously. In some other embodiments, referring to fig. 7, the two determinations may also be performed sequentially, for example, the relationship between the real-time rotation speed of the compressor 71 and the lowest rotation speed is determined first, and then the determination whether the first heat exchanger 22 is in the frosting critical state is performed; or, the judgment of whether the first heat exchanger 22 is in the frosting critical state is performed first, and then the judgment of the relationship between the real-time rotation speed and the lowest rotation speed of the compressor 71 is performed, which does not affect the output of the result of the step S2.

Step S5 of the control method of the present embodiment includes: and according to the relation between the real-time rotating speed and the lowest rotating speed of the compressor 71, whether the first heat exchanger 22 is in the frosting critical state or not, and whether the thermal management system 100 is switched to other working modes, selecting to execute the step S6 or continuously executing the step S3.

Specifically, in the second operating mode of the thermal management system 100, if the first heat exchanger 22 is in the frosting critical state, the real-time rotation speed of the compressor 71 is less than or equal to the minimum rotation speed, and the thermal management system 100 is not switched to other operating modes, the thermal management system 100 continues to operate the second operating mode; otherwise, thermal management system 100 exits the second mode of operation.

In step S6 of this embodiment, the method for the thermal management system 100 to exit the second operation mode includes: if the first heat exchanger 22 is not in the frosting critical state, or the real-time rotating speed of the compressor 71 is greater than the lowest rotating speed, the thermal management system 100 switches to the working mode before entering the second working mode; if the thermal management system 100 switches to another operating mode, the thermal management system 100 switches to a new operating mode.

During the execution of the second mode of operation by thermal management system 100, step S4 is performed. Besides the purpose of improving energy efficiency as described in the previous embodiment, the stability of the system can be improved. Specifically, if the opening degree of the second throttling device 76 is not controlled, when the thermal management system 100 performs the second operation mode, the second heat exchanger 32 exchanges heat with the first coolant system 60, and the rotation speed of the compressor 71 is increased to be greater than the minimum rotation speed due to an increase in the heat exchange demand, so that the thermal management system 100 exits the second operation mode. However, the first heat exchanger 22 still has a risk of frosting, so the rotation speed of the compressor 71 is reduced to the minimum rotation speed again, and then the thermal management system 100 operates the second operation mode again, so that the operation mode of the thermal management system 100 frequently jumps, and the system stability is poor. Optionally, the opening of the second throttling device 76 is adjusted such that the evaporation temperature of the first heat exchanger 22 is maintained at the frosting threshold.

In this embodiment, the determination of the relationship between the real-time rotation speed and the lowest rotation speed of the compressor 71, the determination of whether the first heat exchanger 22 is in the frosting critical state, and the determination of whether the thermal management system 100 is switched to the other working mode are performed simultaneously, and as long as one of the determinations indicates that the second working mode can be exited, the thermal management system 100 exits the second working mode, but only if none of the three determinations indicates that the second working mode can be exited, the thermal management system 100 continues to operate the second working mode.

In some other embodiments, these three determinations may be performed sequentially without affecting the output of the result of step S5. It should be understood that, when the three determinations are performed sequentially, if one of the determinations has a result that the second operating mode can be exited, the remaining determination may not be executed, and the thermal management system 100 exits the second operating mode; if the current judgment result indicates that the second working mode cannot be exited, the next judgment needs to be continuously executed, and when the three judgment results indicate that the second working mode cannot be exited, the thermal management system 100 continuously operates the second working mode.

The present application also provides another embodiment of the control method of the thermal management system 100, as shown in fig. 6 and fig. 7, the present embodiment is different from the previous embodiment in that: step S2 is different from step S5, and the system status of the second operation mode is different, and the differences will be described below, and the same reference is made to the related description of the previous embodiment.

Step S2 of the control method of the present embodiment includes: and selecting to execute the step S3 or continue to execute the step S1 according to the relation between the real-time rotating speed and the lowest rotating speed of the compressor 71, whether the first heat exchanger 22 is in the frosting critical state, whether the battery assembly 63 has a thermal management request and whether the battery assembly 63 is in the low-temperature protection state.

Specifically, in the first operating mode of the thermal management system 100, if the first heat exchanger 22 is in the frosting critical state, the real-time rotation speed of the compressor 71 is less than or equal to the minimum rotation speed, the battery assembly 63 has no thermal management request, and the battery assembly 63 is not in the low-temperature protection state, the thermal management system 100 switches to the second operating mode; otherwise, thermal management system 100 continues to operate in the first mode of operation.

The battery assembly 63 has no heat management request, and the battery assembly 63 is not in the low-temperature protection state, which indicates that the battery assembly 63 is in a stable state and has excess heat, so that the second heat exchanger 32 can exchange heat with the battery assembly 63. Battery assembly 63 has a thermal management request that indicates that thermal management system 100 is regulating battery assembly 63 and that battery assembly 63 is not suitable for exchanging heat with second heat exchanger 32. The battery assembly 63 is in a low temperature protection state, i.e. the temperature of the battery assembly 63 is too low, and the battery assembly 63 is not suitable for exchanging heat with the second heat exchanger 32.

In the second operation mode of the present embodiment, in the second heat exchanger 32, the refrigerant of the refrigerant system is heat-exchanged with the second coolant of the first coolant system 60, and the second coolant whose temperature has been reduced is heat-exchanged with the battery assembly 63, so that the temperature of the coolant is increased. That is, the refrigerant in the second heat exchanger 32 absorbs heat from the battery pack 63, but the battery pack 63 needs to operate in an appropriate temperature range, and therefore the state of the battery pack 63 affects whether the thermal management system 100 can switch to the second operation mode. In the second operation mode of the above embodiment, the second coolant after the temperature reduction exchanges heat with the atmospheric environment, the motor assembly 62, the inverter, or other heat generating devices, and thus the state of the battery assembly 63 may not be considered.

Similarly, the four determinations in step S2 in this example may be performed simultaneously as shown in fig. 6, or may be performed successively as shown in fig. 7, and the execution order of the four determinations S21-S24 may be arbitrarily exchanged, without affecting the result output of step S2.

Step S5 of the control method of the present embodiment includes: according to the relationship between the real-time rotating speed and the lowest rotating speed of the compressor 71, whether the first heat exchanger 22 is in the frosting critical state, whether the battery assembly 63 has a thermal management request, whether the battery assembly 63 is in the low-temperature protection state, and whether the thermal management system 100 is switched to other modes, the step S6 is selected to be executed or the step S3 is continuously executed.

Specifically, in the second operation mode of the thermal management system 100, if the first heat exchanger 22 is in the frosting critical state, the real-time rotation speed of the compressor 71 is less than or equal to the minimum rotation speed, and the thermal management system 100 is not switched to another operation mode, and the battery assembly 63 has no thermal management request, and the battery assembly 63 is not in the low-temperature protection state, the thermal management system 100 continues to operate the second operation mode; otherwise, thermal management system 100 exits the second mode of operation.

In step S6 of this embodiment, the method for the thermal management system 100 to exit the second operation mode includes: if the first heat exchanger 22 is not in the frosting critical state, or the real-time rotating speed of the compressor 71 is greater than the lowest rotating speed, or the battery assembly 63 is in the low-temperature protection state, closing the second throttling device 76, and switching the thermal management system 100 to the working mode before entering the second working mode; if the thermal management system 100 is switched to another working mode, the thermal management system 100 is switched to a new working mode; if there is a thermal management request from battery assembly 63, thermal management system 100 adjusts the opening of second throttling device 76 based on the thermal management request from battery assembly 63.

It should be understood that the thermal management request of the battery assembly 63 is divided into two cases, and when the battery assembly 63 has a cooling requirement, the opening degree of the second throttling device 76 is directly adjusted to meet the cooling requirement of the battery assembly 63. When the battery assembly 63 needs heating, the second throttling device 76 is closed, the heater is turned on, or the temperature of the battery assembly 63 is raised through the second cooling liquid system 50.

Similarly, the five determinations in step S5 in this example may be performed simultaneously or sequentially, and the execution order of the five determinations may be arbitrarily exchanged without affecting the output of the result in step S5. However, as in the previous embodiment, when these five determinations are performed successively, if one of the determinations has a result that the second operating mode can be exited, the remaining determinations may not be executed, and the thermal management system 100 exits the second operating mode; if the current judgment result indicates that the second working mode cannot be exited, the next judgment needs to be continuously executed, and when the five judgments indicate that the second working mode cannot be exited, the thermal management system 100 continuously operates the second working mode.

As shown in fig. 8, in step S2 of this embodiment, before the thermal management system 100 operates the second operation mode, the method for determining whether the battery assembly 63 is under low temperature protection includes the following steps: and selecting to execute the step S243 or execute the step S244 according to the relationship between the inlet temperature of the battery assembly 63 and the third preset temperature and the relationship between the lowest core temperature of the battery assembly 63 and the fourth preset temperature.

The judgment of the relationship between the inlet temperature of the battery pack 63 and the third preset temperature and the judgment of the relationship between the lowest temperature of the core body of the battery pack 63 and the fourth preset temperature may be performed simultaneously or sequentially without affecting the result output. Take the determination of the relationship between the inlet temperature of the battery assembly 63 and the third preset temperature, which is performed sequentially, as an example. Determining whether the battery assembly 63 is under low temperature protection includes the following steps:

s241: one of steps S242 and S244 is selectively performed according to the relationship between the inlet temperature of the battery assembly 63 and the third preset temperature. Specifically, if the inlet temperature of the battery assembly 63 is greater than or equal to the third preset temperature, step S242 is executed; otherwise, step S244 is executed.

S242: one of steps S243 and S244 is selectively performed according to the relationship between the lowest temperature of the core body of the battery assembly 63 and the fourth preset temperature. Specifically, if the lowest temperature of the core body of the battery assembly 63 is greater than or equal to the fourth preset temperature, step S243 is executed; otherwise, step S244 is executed.

S243: the battery assembly 63 is not in the low-temperature protection state. That is, a signal that the battery assembly 63 is not in the low-temperature protection state is output.

S244: the battery assembly 63 is in a low-temperature protection state. That is, a signal that the battery assembly 63 is in the low-temperature protection state is output.

It is understood that the battery assembly 63 is not in the low temperature protection state only when the inlet temperature of the battery assembly 63 is greater than or equal to the third preset temperature and the lowest temperature of the core of the battery assembly 63 is greater than or equal to the fourth preset temperature. Otherwise, the battery assembly 63 is described as being in a low-temperature protection state.

As shown in fig. 10, in step S5 of this embodiment, after the thermal management system 100 operates the second operation mode, the method for determining whether the battery assembly 63 is under low temperature protection includes the following steps:

according to the relationship between the inlet temperature of the battery assembly 63 and the fifth preset temperature, the relationship between the duration time that the inlet temperature of the battery assembly 63 is less than the fifth preset temperature and the third preset time, the relationship between the lowest core temperature of the battery assembly 63 and the sixth preset temperature, and the relationship between the duration time that the lowest core temperature of the battery assembly 63 is less than the sixth preset temperature and the fourth preset time, the step S523 or the step S524 is selectively executed. The determination of the relationship between the duration time that the inlet temperature of the battery assembly 63 is less than the fifth preset temperature and the third preset time is performed after the determination of the relationship between the inlet temperature of the battery assembly 63 and the fifth preset temperature, the determination of the relationship between the duration time that the lowest core temperature of the battery assembly 63 is less than the sixth preset temperature and the fourth preset time is performed after the determination of the relationship between the lowest core temperature of the battery assembly 63 and the sixth preset temperature. The judgment of the relationship between the inlet temperature of the battery pack 63 and the fifth preset temperature and the judgment of the relationship between the lowest temperature of the core body of the battery pack 63 and the sixth preset temperature may be performed simultaneously or sequentially, and when the two judgments are performed sequentially, if one of the judgments has a result that the battery pack 63 is in a low-temperature protection state, the remaining judgments do not need to be performed.

As an example, the judgment of the relationship between the inlet temperature of the battery pack 63 and the fifth preset temperature and the judgment of the relationship between the lowest temperature of the core body of the battery pack 63 and the sixth preset temperature are performed at the same time, and the method includes the following steps:

s521: one of steps S522 and S524 is selectively performed according to the relationship between the inlet temperature of the battery assembly 63 and the fifth preset temperature. Specifically, if the inlet temperature of the battery assembly 63 is less than the fifth preset temperature, step S522 is executed; otherwise, step S524 is executed.

S522: one of steps S523 and S524 is selectively performed according to a relationship between a duration for which the inlet temperature of the battery assembly 63 is less than the fifth preset temperature and the third preset time. Specifically, if the duration that the inlet temperature of the battery assembly 63 is less than the fifth preset temperature is greater than or equal to the third preset time, step S523 is executed; otherwise, step S524 is executed.

S525: one of steps S526 and S524 is selectively performed according to the relationship between the lowest core temperature of the battery assembly 63 and the sixth preset temperature. Specifically, if the lowest temperature of the core body of the battery assembly 63 is less than the sixth preset temperature, step S526 is executed; otherwise, step S524 is executed.

S526: one of steps S523 and S524 is selectively performed according to a relationship between a duration in which the lowest temperature of the core of the battery assembly 63 is less than the sixth preset temperature and the fourth preset time. Specifically, if the duration that the lowest temperature of the core body of the battery assembly 63 is less than the sixth preset temperature is greater than or equal to the fourth preset time, step S523 is executed; otherwise, step S524 is executed.

S523: the battery assembly 63 is in a low-temperature protection state. That is, a signal that the battery assembly 63 is in the low-temperature protection state is output.

S524: the battery assembly 63 is not in the low-temperature protection state. That is, a signal that the battery assembly 63 is not in the low-temperature protection state is output.

In the present application, the inlet temperature of the battery assembly 63 refers to the temperature of the second coolant at the inlet of the battery assembly 63. The lowest temperature of the core of the battery module 63 means a temperature of the core having the lowest temperature among the plurality of cores constituting the battery module 63.

In the present application, the first preset temperature, the second preset temperature, the third preset temperature, the fourth preset temperature, the fifth preset temperature, the sixth preset temperature, the first preset time, the second preset time, the third preset time, and the fourth preset time are all values preset by the system, and can be obtained by the inventor according to experience or experimental data. The second preset temperature is higher than the first preset temperature, the fifth preset temperature is lower than the third preset temperature, and the sixth preset temperature is lower than the fourth preset temperature, so that the phenomenon that a program frequently jumps is improved, and the stability of the system is improved.

It should be understood that the division of the various modules of the thermal management system shown in the above figures is merely a logical division, and may be implemented as a whole or in part integrated into a physical entity, or may be physically separate. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling by the processing element in software, and part of the modules can be realized in the form of hardware. For example, the processing module may be a separate processing element, or may be integrated into a chip of the thermal management system. The other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software. For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors (DSPs), one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, these modules may be integrated together and implemented in the form of a System-On-a-Chip (SOC).

In the above embodiments, the processors may include, for example, a CPU, a DSP, a microcontroller, or a digital Signal processor, and may further include a GPU, an embedded Neural Network Processor (NPU), and an Image Signal Processing (ISP), and the processors 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 program according to the technical solution of the present application. Further, the processor may have the functionality to operate one or more software programs, which may be stored in the storage medium.

The present application also provides a computer-readable storage medium, in which a computer program is stored, which, when run on a computer, causes the computer to perform the method provided by the embodiments shown in fig. 3 to 11 of the present application.

The present application also provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method provided by the embodiments of the present application illustrated in fig. 3 to 11.

Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of electronic hardware and computer software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, any function, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that contribute to the related art in essence may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only an embodiment of the present application, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all of them 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 claims.

Claims

1. A control method of a heat management system comprises a compressor, a first heat exchanger, a first throttling device, a second heat exchanger and a second throttling device, wherein the second heat exchanger comprises a first heat exchanging part and a second heat exchanging part; the control method is characterized by comprising the following steps:

2. The method of controlling a thermal management system of claim 1, wherein after said step of opening said second throttling device in a throttled state and operating said thermal management system in said second mode of operation, further comprising the steps of:

and if the first heat exchanger is not in the frosting critical state or the thermal management system is switched to other working modes, the thermal management system exits the second working mode.

3. The method of controlling a thermal management system of claim 1, wherein before said step of opening said second throttling device in a throttled state and operating said thermal management system in said second mode of operation, further comprising the steps of:

if the first heat exchanger is in a frosting critical state and the real-time rotating speed of the compressor is less than or equal to the lowest rotating speed, the second throttling device is opened to be in a throttling state, and the thermal management system operates in the second working mode; otherwise, the thermal management system continues to operate in the first operating mode.

4. The method of controlling a thermal management system of claim 3, wherein after said step of opening said second throttling device in a throttled state and operating said thermal management system in said second mode of operation, further comprising the steps of:

and if the first heat exchanger is not in the frosting critical state, or the thermal management system is switched to other working modes, or the real-time rotating speed of the compressor is greater than the lowest rotating speed, the thermal management system exits the second working mode.

5. The method of controlling the thermal management system of claim 2 or 4, wherein determining whether the first heat exchanger is in a frost critical state before the thermal management system is operating in the second mode of operation comprises:

if the evaporation temperature of the first heat exchanger is less than or equal to a first preset temperature and the duration time of the evaporation temperature of the first heat exchanger being less than or equal to the first preset temperature is greater than or equal to a first preset time, the first heat exchanger is in the frosting critical state;

if the evaporation temperature of the first heat exchanger is higher than the first preset temperature, or the duration time that the evaporation temperature of the first heat exchanger is lower than or equal to the first preset temperature is shorter than the first preset time, the first heat exchanger is not in the frosting critical state;

the first preset temperature and the first preset time are system set values.

6. The method of controlling a thermal management system of claim 5, wherein determining whether the first heat exchanger is in the frost critical condition after the thermal management system is operating in the second mode of operation comprises:

if the evaporation temperature of the first heat exchanger is higher than a second preset temperature and the duration time that the evaporation temperature of the first heat exchanger is higher than the second preset temperature is longer than or equal to a second preset time, the first heat exchanger is not in the frosting critical state;

if the evaporation temperature of the first heat exchanger is less than or equal to the second preset temperature, or the duration that the evaporation temperature of the first heat exchanger is greater than the second preset temperature is less than the second preset time, the first heat exchanger is in the frosting critical state;

the second preset temperature and the second preset time are system set values, and the second preset temperature is greater than the first preset temperature.

7. The method of controlling a thermal management system of claim 1, wherein the thermal management system further comprises a battery assembly;

before the step of opening the second throttling device to be in a throttling state and operating the thermal management system in the second working mode, the method further comprises the following steps:

if the first heat exchanger is in the frosting critical state, a battery assembly does not have a heat management request, and the battery assembly is not in a low-temperature protection state, the second throttling device is opened to be in a throttling state, the heat management system operates in the second working mode, and the battery assembly circulates cooling liquid; otherwise, the thermal management system continues to operate the first operating mode.

8. The method of controlling the thermal management system of claim 7, wherein after the step of opening the second throttling device in a throttled state and operating the thermal management system in the second operating mode, further comprising the steps of:

and if the first heat exchanger is not in the frosting critical state, or the thermal management system is switched to other working modes, or the battery assembly is in the low-temperature protection state, or the battery assembly has a thermal management request, the thermal management system exits the second working mode.

9. The method of controlling a thermal management system of claim 8, wherein determining whether said battery assembly is in said low temperature protection state before said thermal management system is operating in said second mode of operation comprises the steps of:

if the inlet temperature of the battery assembly is greater than or equal to a third preset temperature and the lowest temperature of the core body of the battery assembly is greater than or equal to a fourth preset temperature, the battery assembly is not in the low-temperature protection state;

if the inlet temperature of the battery assembly is lower than a third preset temperature or the lowest temperature of a core body of the battery assembly is lower than a fourth preset temperature, the battery assembly is in the low-temperature protection state;

and the third preset temperature and the fourth preset temperature are set values of a system.

10. The method of controlling a thermal management system of claim 9, wherein determining whether said battery assembly is in said low temperature protection state after said thermal management system is operating in said second mode of operation comprises the steps of:

if the inlet temperature of the battery assembly is lower than a fifth preset temperature and the duration time that the inlet temperature of the battery assembly is lower than the fifth preset temperature is longer than a third preset time, the battery assembly is in the low-temperature protection state;

if the lowest temperature of the core body of the battery assembly is lower than a sixth preset temperature and the duration time that the inlet temperature of the battery assembly is lower than the sixth preset temperature is longer than a fourth preset time, the battery assembly is in the low-temperature protection state;

if the duration time that the inlet temperature of the battery assembly is less than the fifth preset temperature is less than or equal to the third preset time, the duration time that the inlet temperature of the battery assembly is less than the sixth preset temperature is less than or equal to the fourth preset time, or the inlet temperature of the battery assembly is greater than or equal to the fifth preset temperature, or the lowest temperature of a core body of the battery assembly is greater than or equal to the sixth preset temperature, the battery assembly is not in the low-temperature protection state;

the fifth preset temperature, the sixth preset temperature, the third preset time and the fourth preset time are system set values, the fifth preset temperature is smaller than the third preset temperature, and the sixth preset temperature is smaller than the fourth preset temperature.

11. The method of controlling a thermal management system of claim 1, 3 or 7, wherein after said step of opening said second throttling means in a throttled state, said thermal management system operating in said second mode of operation, further comprising the steps of:

and adjusting the opening degree of the second throttling device to enable the real-time rotating speed of the compressor to be equal to the lowest rotating speed.