CN113525025B - Thermal management system and control method thereof - Google Patents
Thermal management system and control method thereof Download PDFInfo
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- CN113525025B CN113525025B CN202110661316.5A CN202110661316A CN113525025B CN 113525025 B CN113525025 B CN 113525025B CN 202110661316 A CN202110661316 A CN 202110661316A CN 113525025 B CN113525025 B CN 113525025B
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- cabin
- battery assembly
- target temperature
- way valve
- opening ratio
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00885—Controlling the flow of heating or cooling liquid, e.g. valves or pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H2001/00307—Component temperature regulation using a liquid flow
Abstract
The embodiment of the application provides a control method of a thermal management system, which comprises the following steps: the thermal management system comprises a fluid driving device, a heater, a multi-way valve, a first heat exchanger and a second heat exchanger; operating a thermal management system, wherein a driving device drives fluid to flow in at least one of a heater, a multi-way valve, a first heat exchanger and a second heat exchanger, the first heat exchanger exchanges heat with the cabin, and the second heat exchanger exchanges heat with the battery assembly; acquiring a target temperature of a cabin and a target temperature of a battery assembly; the target temperature of the cabin is compared with the target temperature of the battery assembly, the heating power of the heater is controlled according to the larger one of the cabin and the battery assembly, and the multi-way valve is controlled according to the smaller one of the cabin and the battery assembly, so that the proportion of fluid flowing into the first heat exchanger and the second heat exchanger is controlled. The application also provides a thermal management system, which comprises a control device for running the control method.
Description
Technical Field
The present disclosure relates to thermal management technologies, and in particular, to a thermal management system and a control method thereof.
Background
In order to meet the energy-saving and environment-friendly requirements, a new energy automobile is taken as an important environment-friendly tool, and how to realize the heat management of a more energy-saving automobile cabin and a battery is an urgent problem to be solved.
The thermal management system of the battery car heats the cooling liquid by using a heater, and the cabin and the battery assembly are heated by circulating the cooling liquid. In the related art, the control method of the thermal management system is that after the target temperature of the heater is the target temperature of the integrated cabin and the target temperature of the battery assembly, a compensation amount is added to obtain, and then the heater is controlled according to the target temperature of the heater so as to meet the heating requirements of the cabin and the battery assembly. However, in practical applications, there is a tendency that the heating power of the heater is high and energy is wasted.
Disclosure of Invention
The application provides a thermal management system and a control method thereof, wherein the method ensures that the power of a heater is more proper when meeting two heating demands, improves the phenomenon that a high-power heater is used for meeting the heating demands, and saves more energy.
In a first aspect, the present application provides a control method of a thermal management system, the control method including the steps of:
providing a thermal management system for adjusting the temperature of a cabin and a battery assembly, the thermal management system comprising a fluid drive, a heater, a multi-way valve, a first heat exchanger, and a second heat exchanger;
operating a thermal management system, wherein the driving device drives fluid to flow in at least one of the heater, the multi-way valve, the first heat exchanger and the second heat exchanger, the first heat exchanger exchanges heat with the cabin, and the second heat exchanger exchanges heat with the battery assembly;
acquiring a target temperature of a cabin and a target temperature of a battery assembly; the target temperature of the cabin is compared with the target temperature of the battery assembly, the heating power of the heater is controlled according to the larger one of the two, and the multi-way valve is controlled according to the smaller one of the two, so that the proportion of fluid flowing into the first heat exchanger and the second heat exchanger is controlled.
According to the control method, according to the comparison result of the cabin body target temperature and the battery assembly target temperature, the heating power of the heater is controlled according to the larger one, and the opening proportion of the multi-way valve is controlled according to the smaller one, so that the proportion of fluid flowing into the first heat exchanger and the second heat exchanger is controlled.
In a second aspect, the present application provides a thermal management system comprising a fluid drive, a heater, a multi-way valve, a first heat exchanger, a second heat exchanger, and a control, the drive configured to drive a fluid within at least one of the heater, the multi-way valve, the first heat exchanger, and the second heat exchanger; the control device runs the control method of the thermal management system.
Compared with the scheme of the related art, the control device in the thermal management system can use the heating power of the more suitable heater, improve the phenomenon that the heating power of the heater is higher, and meet the heating requirements of the cabin and the battery assembly in a more energy-saving mode.
Drawings
FIG. 1 is a block diagram of one embodiment of a thermal management system of the present application;
FIG. 2A is a schematic diagram of one embodiment of a thermal management system of the present application;
FIG. 2B is a schematic diagram of another embodiment of a thermal management system of the present application;
FIG. 3 is a flow chart of steps S10, S20 and S30 in an embodiment of the control method of the present application;
FIG. 4 is a flow chart of an embodiment of the step S30 shown in FIG. 3;
fig. 5 is a flow chart of step S40, step S50 to step S57 in an embodiment of the control method of the present application.
Detailed Description
The terminology used in the description section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
In the related art, after the target temperature of the heater is the target temperature of the comprehensive cabin and the target temperature of the battery component, a compensation amount is added to obtain, the heater is controlled according to the target temperature of the heater, then the target temperature of the cabin is adjusted by controlling the opening of the air door, and the target temperature of the battery component is achieved by adjusting the opening proportion of the multi-way valve, so that the heating requirements of the cabin and the battery component are met. However, when in actual use, on the one hand, the opening degree of the air door cannot be ensured to be large enough, if the opening degree of the air door is small at the moment, the heating power of the heater needs to be improved in order to meet the heating requirement of the cabin body, but the heat of the first heat exchanger cannot be completely emitted to the cabin body, so that energy waste is caused, and energy conservation is not facilitated. On the other hand, the opening ratio of the multi-way valve is selected from a plurality of fixed opening ratios, and the temperature adjustment fluctuation of the battery pack is large.
Therefore, the application provides a thermal management system and a control method thereof, according to the comparison result of the target temperature of the cabin and the target temperature of the battery assembly, the control of the heater according to the larger can ensure that the temperature supply requirement of the higher can be met, and the control of the multi-way valve according to the smaller can meet the lower heating requirement by adjusting the flow. The method ensures that the power of the heater is more proper while meeting the heating requirements of two places, improves the phenomenon that the heater with high power is required to meet the heating requirements, and saves more energy.
As shown in fig. 1, thermal management system 100 may include: thermal management device 101 and control device 102. Alternatively, the thermal management system 100 may be applied to an electric vehicle, where the thermal management device 101 is an air conditioning device of the vehicle, the control device 102 is a control unit of the vehicle, a passenger compartment of the vehicle is a cabin, and a battery pack for supplying power to the vehicle is a battery assembly. The thermal management device 101 is electrically connected with part of the components of the control device 102, and the thermal management device 101 is used for realizing thermal management of the cabin and the battery assembly.
Specifically, as shown in fig. 2A, the thermal management device 101 includes a fluid driving device 16, a heater 10, a multi-way valve 11, a first heat exchanger 121, and a second heat exchanger 13, and the heater 10, the multi-way valve 11, the first heat exchanger 121, and the second heat exchanger 13 may be connected and connected by pipes to form a circuit. The first heat exchanger 121 is connected in parallel with the second heat exchanger 13, the first heat exchanger 121 is capable of exchanging heat with the cabin 12, and the second heat exchanger 13 is capable of exchanging heat with the battery assembly 14. The heater 10 may be turned on to heat the first fluid. The multi-way valve 11 comprises a first valve port 111, a second valve port 112 and a third valve port 113, the first valve port 111 is in communication with the outlet of the heater 10, the second valve port 112 is in communication with the inlet of the first heat exchanger 121, the third valve port 113 is in communication with the inlet of the second heat exchanger 13, and the multi-way valve 11 is used for dividing the first fluid flowing out of the heater 10 to form a first part of the first fluid and a second part of the first fluid. Wherein a first portion of the first fluid is in heat exchange relationship with the tank 12 via the first heat exchanger 121 and a second portion of the first fluid is in direct heat exchange relationship with the battery assembly 14 via the second heat exchanger 13. The fluid driving device provides power for the flow of the first fluid, and optionally, the fluid driving device is an electronic water pump. Alternatively, the first fluid is a mixed solution of water and ethanol.
As shown in fig. 2B, in some other embodiments, the thermal management device 101 includes a first fluid driving device 16, a second fluid driving device 17, a heater 10, a multi-way valve 11, a first heat exchanger 121, a second heat exchanger 13, and a third heat exchanger 15, where the first heat exchanger 121 is in heat exchange relationship with the cabin 12, and the third heat exchanger 15 is in heat exchange relationship with the battery assembly 14. The second heat exchanger 13 includes a first heat exchanging portion 131 and a second heat exchanging portion 132 capable of performing heat exchange, the first heat exchanging portion 131 is not communicated with the second heat exchanging portion 132, the heater 10, the multi-way valve 11, the first heat exchanger 121 and the first heat exchanging portion 131 form a first circuit through pipe connection and communication, the second heat exchanging portion 132 and the third heat exchanger 15 form a second circuit through pipe connection and communication, the first circuit is provided with the first fluid driving device 16 to provide power, the second circuit is provided with the second fluid driving device 17 to provide power, and the second fluid flows in the second circuit. In this embodiment, the first valve port 111 is communicated with the outlet of the heater 10, the second valve port 112 is communicated with the inlet of the first heat exchanger 121, the third valve port 113 is communicated with the inlet of the first heat exchanging portion 131, the multi-way valve 11 is used for dividing the first fluid flowing out of the heater 10, the first part of the first fluid exchanges heat with the cabin 12 through the first heat exchanger 121, the second part of the first fluid exchanges heat with the second fluid in the second circuit through the second heat exchanger 13, and the third heat exchanger 15 in the second circuit directly exchanges heat with the battery assembly 14. In some other embodiments, the second circuit may also be in direct heat exchange with the battery assembly 14. Alternatively, the second fluid is a mixed solution of water and ethanol.
In the present embodiment, the third heat exchanger 15 is provided separately from the battery assembly 14. In some other embodiments, the third heat exchanger 15 and the battery assembly 14 may be integrated as a unitary device.
The thermal management device 101 may further include a damper 122, where the damper 122 is located on an upstream side of the first heat exchanger 121, and the damper 122 controls an air volume flowing through the first heat exchanger 121, and the air after exchanging heat with the first heat exchanger 121 blows into the cabin 12. The opening degree of the damper 122 is adjusted to control the amount of air blown into the cabin 12.
The opening degree of the damper 122 may be controlled according to the blowing mode. In this embodiment, the thermal management system includes a face-blowing mode in which the wind is controlled to blow only to the face of the user, a foot-blowing mode in which the wind is controlled to blow only to the foot of the user, and a double-blowing mode in which the wind is controlled to blow both to the face and to the foot of the user. In the blowing mode, which is a face blowing mode or a foot blowing mode, the control damper 122 is in a fully opened state, i.e., the damper opening is 100%, so that all the wind flows through the first heat exchanger. In the double blow mode, the control damper 122 is at a maximum condition where the damper opening is at a system calibration value between 50% and 100% to allow maximum wind flow through the first heat exchanger. Alternatively, at maximum, the system calibration is between 70% and 100%, for example 80% throttle opening. By the arrangement, the position of the air door is fixed, all or the largest wind flows through the first heat exchanger, all or the largest heat is guaranteed to be used for exchanging heat with the cabin, and the phenomenon of energy waste is improved. Because the opening degree of the air door is kept unchanged, the control difficulty can be reduced.
The control device 102 comprises a processing module 103 and an acquisition module 104, the processing module 103 being electrically connected to parts of the thermal management device 101 and the acquisition module 104, respectively. The processing module 103 is configured to obtain a target temperature of the cabin, a target temperature of the battery assembly, and an operating mode of the thermal management device 101. The target temperature of the cabin body can be obtained according to the demand temperature input by a user through the control panel, and the target temperature of the cabin body is influenced by the environment outside the vehicle. The target temperature of the battery assembly may be obtained from the water temperature at the inlet or the water temperature at the outlet of the second heat exchanger 13, for example, by calculation. The operation modes of the heat management system can comprise a heating mode, a heating and dehumidifying mode, a refrigerating mode and the like, and the control method is applied to the heating mode. Optionally, the thermal management system may include an interactive interface or a communication device, where the interactive interface may obtain user input information, such as a target temperature or an operation mode required by a user, and the target temperature of the cabin may be determined according to the target temperature required by the user, and the interactive interface may be a control panel of the electric automobile. The communication device may receive the obtained target temperature of the cabin, the target temperature of the battery assembly, the operation mode, and the like, which are sent by the user side (such as a remote controller, etc.). The processing module is used to control the operation state of the thermal management device 101, for example, control the power of the heating device 10, the opening ratio of the multi-way valve 11, the opening of the damper 122, and the like.
The acquisition module 104 is used for detecting the current temperature of the cabin and the current temperature of the battery assembly. The collection module 104 may include at least two temperature sensors, at least one temperature sensor may be disposed at an air-conditioning outlet (such as an air-conditioning grille outlet) in the cabin 12, and the current temperature of the cabin may be obtained in real time according to the detection value, and at least one temperature sensor may be disposed in the battery assembly, and the current temperature of the battery assembly may be obtained in real time according to the detection value. Alternatively, a temperature sensor may be provided at the inlet or outlet of the second heat exchanger 13 to detect in real time the inlet water temperature or outlet water temperature of the second heat exchanger 13 as a determination condition of the current temperature of the battery pack. The acquisition module 104 may also obtain a current opening ratio of the multi-way valve. The processing module 103 may obtain information such as the current temperature of the cabin, the current temperature of the battery assembly, and the current opening ratio of the multi-way valve from the acquisition module 104. In some other embodiments, the acquisition module 104 may not be provided, and the processing module 103 itself has detection and acquisition functions.
The processing module 103 may be used to perform a control method, the specific steps or principles of which are set forth in the following embodiments.
It should be understood that the division of the modules of the thermal management system shown in the above figures is merely a division of a logic function, and may be fully or partially integrated into a physical entity or may be physically separated. And these modules may all be implemented in software in the form of calls by the processing element; or can be realized in hardware; it is also possible that part of the modules are implemented in the form of software called by the processing element and part of the modules are implemented in the form of hardware. For example, the processing module may be a stand alone processing element or may be implemented integrated in a chip of the thermal management system. The implementation of the other modules is similar. In addition, all or part of the modules can be integrated together or can be independently implemented. 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 a software form.
For example, the modules above may be one or more integrated circuits configured to implement the methods above, such as: one or more specific integrated circuits (Application Specific Integrated Circuit; hereinafter ASIC), or one or more microprocessors (Digital Singnal Processor; hereinafter DSP), or one or more field programmable gate arrays (Field Programmable Gate Array; hereinafter FPGA), etc. For another example, the modules may be integrated together and implemented in the form of a System-On-a-Chip (SOC).
The embodiment of the present application also provides a control method, which may be applied to the example of the thermal management system provided in fig. 1 to 2B, where the control method is performed by the control device 102, and a detailed description of the thermal management system is omitted herein, and reference may be made to the description of the thermal management system. The control method provided in the embodiment of the present application is described in detail below.
The control method may include the steps of:
s10, judging whether the thermal management system is in a heating mode or not;
s20, if the thermal management system is in a heating mode, acquiring the target temperature of the cabin and the target temperature of the battery assembly, and ending the procedure otherwise;
and S30, comparing the target temperature of the cabin with the target temperature of the battery assembly, controlling the heating power of the heater 10 according to the larger one of the two temperatures, and controlling the opening ratio of the multi-way valve 11 according to the smaller one of the two temperatures.
In this embodiment, the opening ratio of the multi-way valve 11 is the ratio of the flow rate of the second portion of the first fluid to the total flow rate of the first fluid, and the opening ratio of the multi-way valve 11 is adjusted, i.e. the flow rate of the second portion of the first fluid is increased. In some other embodiments, the opening ratio of the multi-way valve 11 may be the ratio of the flow rate of the first portion of the first fluid to the total flow rate of the first fluid, which may be defined according to the requirement, and is not limited in this application.
As shown in fig. 4, step S30 may include:
s31, judging whether the target temperature of the cabin is greater than or equal to the target temperature of the battery assembly;
if the target temperature of the cabin is greater than or equal to the target temperature of the battery assembly, steps S32 and S33 are performed; if the target temperature of the cabin is less than the target temperature of the battery assembly, steps S34 and S35 are performed.
Specifically, step S32 includes: the heating power of the heater 10 is controlled based on the target temperature of the cabin and the current temperature of the cabin.
Step S33 includes: the opening ratio of the multi-way valve 11 is controlled based on the target temperature of the battery assembly and the current temperature of the battery assembly or based on the current opening ratio of the multi-way valve, the target temperature of the battery assembly and the current temperature of the battery assembly, according to the difference between the target temperature of the cabin and the current temperature of the cabin.
At any time before executing steps S32 and S33, the control method further includes: the current temperature of the cabin, the current temperature of the battery assembly, and the current opening ratio of the multi-way valve may be obtained by referring to the function or principle of the acquisition module 104 in the thermal management system 100, which is not described herein.
If the target temperature of the cabin is greater than or equal to the target temperature of the battery assembly, the target temperature of the cabin is taken as the target temperature of the heater 10. In step S32, the heating power of the heater 10 is increased or decreased according to the target temperature of the cabin and the current temperature of the cabin to meet the heating requirement of the cabin 12. Alternatively, PI or PID operation is performed on the difference between the target temperature of the cabin and the current temperature of the cabin, and the heating power of the heater 10 is increased or decreased according to the operation result.
Meanwhile, in step S33, according to the difference between the target temperature of the cabin and the current temperature of the cabin, the opening ratio of the multi-way valve 11 is controlled based on the target temperature of the battery assembly and the current temperature of the battery assembly or based on the current opening ratio of the multi-way valve, the target temperature of the battery assembly and the current temperature of the battery assembly, so as to satisfy the heating requirement of the battery assembly 14. Optionally, the difference between the target temperature of the cabin and the current temperature of the cabin is compared with a first threshold T1 and a second threshold T2, and the opening ratio of the multi-way valve 11 is adjusted according to the comparison result, so as to regulate the flow ratio of the first part of the first fluid to the second part of the first fluid.
Optionally, the first threshold T1 and the second threshold T2 are system set values, and the first threshold T1 is greater than the second threshold T2.
In step S33, the adjustment of the opening ratio of the multi-way valve 11 is affected by both the cabin 12 heating demand and the battery assembly 14 heating demand. That is, in any case, it is necessary to control the opening ratio of the multi-way valve 11 not to be smaller than a certain preset opening ratio, so as to ensure that the flow rate of the first fluid in the branch where the first heat exchanger 121 is located cannot be too small, and ensure the comfort level of the cabin 12 side. Specifically, before the opening ratio of the multi-way valve 11 is controlled according to the target temperature of the battery assembly and the current temperature of the battery assembly, it is necessary to consider whether the difference between the current temperature of the cabin and the target temperature of the cabin is large.
As shown in fig. 5, step S33 includes the steps of:
s50, judging whether the difference value between the current temperature of the cabin and the target temperature of the cabin is larger than or equal to a first threshold value T1;
(1) If the difference between the current temperature of the cabin and the target temperature of the cabin is greater than or equal to the first threshold T1, step S51 is performed.
Step S51: whether the current opening ratio of the multi-way valve is larger than or equal to the minimum opening ratio and whether the current temperature of the battery assembly is smaller than the target temperature of the battery assembly is judged. If both of them are satisfied, step S52 is executed, and otherwise step S56 is executed. Wherein the minimum opening ratio is a system calibration value. Alternatively, the minimum opening ratio is 30%.
(2) If the difference between the current temperature of the cabin and the target temperature of the cabin is less than the first threshold T1, step S53 is performed.
S53: and judging whether the difference value between the current temperature of the cabin and the target temperature of the cabin is smaller than a first threshold value T1 and larger than or equal to a second threshold value T2.
1) If the difference between the current temperature of the cabin and the target temperature of the cabin is less than the first threshold T1 and greater than or equal to the second threshold T2, step S54 is performed.
Step S54: whether the current opening ratio of the multi-way valve is larger than or equal to the minimum opening ratio and whether the current temperature of the battery assembly is smaller than the target temperature of the battery assembly is judged. If both the two are satisfied, executing step S55; otherwise, step S56 is performed.
2) If the difference between the current temperature of the cabin and the target temperature of the cabin is less than the second threshold T2, step S56 is performed.
Step S52: the opening ratio of the multi-way valve 11 is adjusted to the minimum opening ratio or the opening ratio of the multi-way valve 11 is maintained to the minimum opening ratio.
Step S55: the opening ratio of the multi-way valve 11 is kept unchanged.
Step S56: the difference between the target temperature of the battery assembly and the current temperature of the battery assembly is calculated. Optionally, the operation type is PI operation or PID operation.
After the step S52, S55 or S56 is performed, step S57 is performed, specifically, the target opening ratio of the multi-way valve 11 is output, so that the control device 102 adjusts the opening ratio of the multi-way valve 11 to regulate the flow rate of the first part of the first fluid and the flow rate of the second part of the first fluid.
At any time before step S50 is performed, step S40 is also performed. Specifically, the current temperature of the cabin, the current temperature of the battery assembly and the current opening ratio of the multi-way valve are obtained.
The method has the thought that the difference between the current temperature of the cabin and the target temperature of the cabin is divided into three sections, and the method is characterized in that the difference between the target temperature of the cabin and the current temperature of the cabin is large, the difference between the target temperature of the cabin and the current temperature of the cabin is normal, and the difference between the target temperature of the cabin and the current temperature of the cabin is small.
Specifically, when the difference between the target temperature of the cabin and the current temperature of the cabin is large, the flow of the first fluid in the branch where the first heat exchanger 121 is located needs to be sufficient to meet the heating requirement of the cabin 12 side. At this time, if the heating requirement of the battery assembly 14 side is still not satisfied, but the current opening ratio of the multi-way valve 11 is greater than or equal to the minimum opening ratio allowed by the system, the opening ratio of the multi-way valve may be adjusted to the minimum opening ratio, so as to ensure that the heating requirement of the cabin 12 side may be satisfied on the premise of satisfying the heating requirement of the battery assembly 14 side. The reason for setting the minimum opening ratio is to prevent too little coolant flowing through the first heat exchanger 121, resulting in slower satisfaction of the heating demand on the cabin 14 side and poor comfort.
When the difference between the target temperature of the cabin and the current temperature of the cabin is normal, if the heating requirement of the battery assembly 14 is not met at this time, and the current opening ratio of the multi-way valve 11 is greater than or equal to the minimum opening ratio allowed by the system, the target opening ratio of the multi-way valve 11 can be controlled to be equal to the current opening ratio of the multi-way valve. It can be understood that the opening ratio of the multi-way valve 11 at this time can be basically used to meet the heating requirement of the cabin 12 side, and the opening ratio of the multi-way valve 11 can be not reduced, but cannot be increased.
When the difference between the target temperature of the cabin and the current temperature of the cabin is smaller, the influence of the opening ratio of the multi-way valve 11 on the heating requirement of the cabin side 12 is smaller, and the opening ratio of the multi-way valve 11 is adjusted according to the heating requirement of the battery assembly side 14.
In other cases not described above and when the difference between the current temperature of the cabin and the target temperature of the cabin is small, the difference between the target temperature of the battery pack and the current temperature of the battery pack may be calculated to obtain the opening ratio of the multi-way valve 11, and then the multi-way valve 11 is controlled.
Alternatively, the difference between the current temperature of the cabin and the target temperature of the cabin may be divided into fewer or more intervals, which is not limited by the embodiment of the present application, and is only used for exemplary illustration.
In one possible implementation manner, in step 52, adjusting the opening ratio of the multi-way valve 11 to the minimum opening ratio may include: the opening ratio of the multi-way valve 11 is adjusted to the minimum opening ratio at a speed of decreasing the preset ratio opening at every preset time. Wherein, the preset time and the preset proportional opening are both system set values. Alternatively, the opening ratio of the multi-way valve 11 is reduced at a rate of 1% opening ratio per second until the minimum opening ratio is reduced.
As shown in fig. 4, step S30 further includes:
s34: the heating power of the heater 10 is controlled based on the target temperature of the battery pack and the current temperature of the battery pack.
S35: the opening ratio of the multi-way valve 11 is controlled based on the target temperature of the cabin and the current temperature of the cabin.
When the target temperature of the cabin is less than the target temperature of the battery pack, the target temperature of the battery pack is taken as the target temperature of the heater 10. At any time before executing steps S34 and S35, the control method further includes: the current temperature of the cabin, the current temperature of the battery assembly, and the current opening ratio of the multi-way valve may be obtained by referring to the function or principle of the acquisition module 104 in the thermal management system 100, which is not described herein.
In step S34, the heating power of the heater 10 is controlled according to the target temperature of the battery pack and the current temperature of the battery pack so that the current temperature of the battery pack reaches the target temperature of the battery pack to satisfy the heating demand of the battery pack 14 side. Alternatively, PI or PID operation is performed with a difference between the target temperature of the battery pack and the current temperature of the battery pack, and the heating power of the heater 10 is increased or decreased according to the operation result.
Meanwhile, in step S35, according to the target temperature of the cabin and the current temperature of the cabin, the opening ratio of the multi-way valve 11 is controlled so that the current temperature of the cabin reaches the target temperature of the cabin to meet the heating requirement of the cabin 12 side. Optionally, PI or PID operation is performed according to the difference between the target temperature of the cabin and the current temperature of the cabin, and the opening ratio of the multi-way valve 11 is increased or decreased according to the operation result, so as to regulate the flow ratio of the first part of the first fluid to the second part of the first fluid.
In one possible implementation, the thermal management system 100 includes a first heat exchanger 121 and a damper 122, where a first portion of the first fluid exchanges heat with the cabin 12 through the first heat exchanger 121, the damper 122 is located on an upstream side of the first heat exchanger 121, and the damper 122 controls an air volume flowing through the first heat exchanger 121, and the control method may further include: the control damper 122 is in a full open state or in a maximum state according to the blowing mode.
Further, the blowing modes include a blowing face mode, a blowing foot mode and a double blowing mode, and the blowing face mode, the blowing foot mode and the double blowing mode may refer to the functions or principles of the thermal management system 100 described above, and will not be described herein. The control method may further include:
when the blowing mode is the face blowing mode or the foot blowing mode, the control damper 122 is in a fully opened state, and in the fully opened state, the opening degree of the damper 122 is 100%; or alternatively, the first and second heat exchangers may be,
when the blowing mode is the double blowing mode, the damper 122 is controlled to be in a maximum state in which the opening degree of the damper 122 is a system calibration value, and the system calibration value is between 50% and 100%.
The idea of the above method is to set the damper 122 in the fully opened state or in the maximum state according to the blowing mode when the heating power of the heater 10 and the opening ratio of the multi-way valve 11 are controlled. It will be appreciated that in any event as much wind as possible is kept flowing through the first heat exchanger 121, exploiting the maximum heat exchange capacity of the first heat exchanger 121, reducing the energy losses. The situation that the heating power of the heater 10 is high but the opening degree of the damper 122 is small and the heat exchanging capability of the first heat exchanger 121 is wasted in the related art is improved.
According to the multi-way valve, the heat exchange capacity of the first heat exchanger 121 is fully utilized, the target temperature of the cabin is compared with the target temperature of the battery assembly, the heating power of the heater 10 is controlled according to the larger one, the opening proportion of the multi-way valve 11 is controlled according to the smaller one, the heating power of the heater 10 is more suitable on the premise that the heating requirements of the cabin 12 and the battery assembly 14 are met, the phenomenon that the heating power of the heater 10 is higher can be improved, and the energy is saved.
It should be understood that the "system calibration value" in the present application refers to a value that the inventor gives through a lot of experiments or research and development experience, and is preset in the control device 102.
In this application, P of the PID algorithm is an abbreviation of pro-port, I is an abbreviation of Integral, and D is an abbreviation of Differential. As the name suggests, the PID algorithm is a control algorithm that combines three links of proportional, integral and derivative.PIDThe essence of the algorithm is that the algorithm is operated according to the input deviation value and the function relation of proportion, integral and differential, the operation result is used for controlling output, and the deviation of the controlled object can be effectively corrected through the combination of the three algorithms, so that the controlled object is in a stable state.
P of PI algorithm is abbreviation of pro-port, I is abbreviation of Integral, PI algorithm is control algorithm combining Proportional and Integral. And forming a control deviation according to the given value and the actual output value, forming a control quantity by linearly combining the proportion and integral of the deviation, and controlling the controlled object.
In the above embodiments, the processor 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 processor (Image Signal Processing; ISP), where the processor may further include a necessary hardware accelerator or a logic processing hardware circuit, such as an ASIC, or one or more integrated circuits for controlling the execution of the program in the technical solution of the present application, and so on. Further, the processor may have a function of operating one or more software programs, which may be stored in a storage medium.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when run on a computer causes the computer to perform the method provided by the embodiment shown in fig. 3 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 embodiment shown in fig. 3 of the present application.
In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in the embodiments disclosed herein can be implemented as a combination of electronic hardware, computer software, and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In several embodiments provided herein, any of the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the related art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (hereinafter referred to as ROM), a random access Memory (Random Access Memory) and various media capable of storing program codes such as a magnetic disk or an optical disk.
The foregoing is merely specific embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which 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 (9)
1. A control method of a thermal management system, the control method comprising the steps of:
providing a thermal management system for adjusting the temperature of a cabin and a battery assembly, the thermal management system comprising a fluid drive, a heater, a multi-way valve, a first heat exchanger, and a second heat exchanger;
operating a thermal management system, wherein the driving device drives fluid to flow in at least one of the heater, the multi-way valve, the first heat exchanger and the second heat exchanger, the first heat exchanger exchanges heat with the cabin, and the second heat exchanger exchanges heat with the battery assembly;
acquiring a target temperature of a cabin and a target temperature of a battery assembly; comparing the target temperature of the cabin with the target temperature of the battery assembly, controlling the heating power of the heater according to the larger one of the two, and controlling the multi-way valve according to the smaller one of the two, so as to control the proportion of fluid flowing into the first heat exchanger and the second heat exchanger;
the step of comparing the target temperature of the cabin with the target temperature of the battery assembly, controlling the heating power of the heater according to the larger of the two, and controlling the opening ratio of the multi-way valve according to the smaller of the two comprises the following steps:
if the target temperature of the cabin is greater than or equal to the target temperature of the battery assembly, controlling the heating power of the heater based on the target temperature of the cabin and the current temperature of the cabin, and controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly or based on the current opening ratio of the multi-way valve, the target temperature of the battery assembly and the current temperature of the battery assembly according to the difference value between the current temperature of the cabin and the target temperature of the cabin;
and if the target temperature of the cabin is smaller than the target temperature of the battery assembly, controlling the heating power of the heater based on the target temperature of the battery assembly and the current temperature of the battery assembly, and controlling the opening proportion of the multi-way valve based on the target temperature of the cabin and the current temperature of the cabin.
2. A control method of a thermal management system according to claim 1, wherein in said step of controlling the multi-way valve according to the smaller one of the two:
the multi-way valve comprises a first valve port, a second valve port and a third valve port, the heater is communicated with the first valve port, the first heat exchanger is communicated with the second valve port, and the second heat exchanger is communicated with the third valve port;
the multi-way valve controls the amount of fluid flowing between the first valve port and the second valve port, and the multi-way valve controls the amount of fluid flowing between the first valve port and the third valve port, thereby controlling the ratio of fluid flowing into the first heat exchanger to fluid flowing into the second heat exchanger.
3. The control method of a thermal management system according to claim 1, further comprising, before the control of the heating power of the heater according to the larger one of the two, the control of the opening ratio of the multi-way valve according to the smaller one of the two, the steps of:
and acquiring the current temperature of the cabin, the current temperature of the battery assembly and the current opening proportion of the multi-way valve.
4. The method according to claim 1, wherein the step of controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly or based on the current opening ratio of the multi-way valve, the target temperature of the battery assembly and the current temperature of the battery assembly according to the difference between the current temperature of the cabin and the target temperature of the cabin comprises the steps of:
when the difference between the current temperature of the cabin and the target temperature of the cabin is greater than or equal to a first threshold, judging whether the current opening ratio of the multi-way valve is greater than or equal to a minimum opening ratio and judging whether the current temperature of the battery assembly is smaller than the target temperature of the battery assembly, if both the current opening ratio and the current opening ratio are met, adjusting the opening ratio of the multi-way valve to the minimum opening ratio or keeping the opening ratio of the multi-way valve to be the minimum opening ratio, otherwise, controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly;
when the difference between the current temperature of the cabin and the target temperature of the cabin is smaller than a first threshold and larger than or equal to a second threshold, judging whether the current opening ratio of the multi-way valve is larger than or equal to the minimum opening ratio and judging whether the current temperature of the battery assembly is smaller than the target temperature of the battery assembly, if both the current opening ratio of the multi-way valve and the target temperature of the battery assembly are met, keeping the opening ratio of the multi-way valve unchanged, otherwise, controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly;
when the difference between the current temperature of the cabin and the target temperature of the cabin is smaller than a second threshold value, controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly;
the first threshold value, the second threshold value and the minimum opening ratio are system calibration values, and the first threshold value is larger than the second threshold value.
5. The method according to claim 4, wherein the step of controlling the opening ratio of the multi-way valve based on the target temperature of the battery assembly and the current temperature of the battery assembly includes the steps of:
and calculating the difference between the target temperature of the battery assembly and the current temperature of the battery assembly, and controlling the opening proportion of the multi-way valve according to the calculation result so as to regulate and control the proportion of the fluid flowing into the first heat exchanger and the fluid flowing into the second heat exchanger.
6. The method of controlling a thermal management system according to claim 4, wherein the step of adjusting the opening ratio of the multi-way valve to the minimum opening ratio is: the opening ratio of the multi-way valve is regulated to the minimum opening ratio at the speed of reducing the preset opening ratio every other preset time; the preset time and the preset opening ratio are system calibration values.
7. The method of controlling a thermal management system according to claim 1, wherein the step of controlling the heating power of the heater based on the target temperature of the battery assembly and the current temperature of the battery assembly, and controlling the opening ratio of the multi-way valve based on the target temperature of the cabin and the current temperature of the cabin, comprises the steps of:
calculating a difference value between the target temperature of the battery assembly and the current temperature of the battery assembly, controlling the heating power of the heater according to a calculation result, calculating a difference value between the target temperature of the cabin and the current temperature of the cabin, and controlling the opening ratio of the multi-way valve according to a calculation result so as to regulate and control the ratio of fluid flowing into the first heat exchanger to fluid flowing into the second heat exchanger;
the step of controlling the heating power of the heater based on the target temperature of the cabin and the current temperature of the cabin comprises the following steps: and calculating the difference between the target temperature of the cabin and the current temperature of the cabin, and controlling the heating power of the heater according to the calculation result.
8. The control method of a thermal management system according to any one of claims 1 to 7, wherein the thermal management system includes a damper located on an upstream side of the first heat exchanger, the damper controlling an amount of air flowing through the first heat exchanger, the control method further comprising the steps of: and controlling the air door to be in a full open state or in a maximum state according to the air blowing mode.
9. A thermal management system comprising a fluid drive, a heater, a multi-way valve, a first heat exchanger, a second heat exchanger, and a control device, the drive configured to drive fluid within at least one of the heater, the multi-way valve, the first heat exchanger, and the second heat exchanger, the control device configured to operate the method of controlling a thermal management system of any one of claims 1-7.
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