A vehicle thermal management control method and device, computer equipment and storage medium

Abstract

This application discloses a vehicle thermal management control method, device, computer equipment, and storage medium, relating to the field of vehicle control technology, to solve the problem of inaccurate traditional automotive thermal management control. The method includes: acquiring vehicle status parameters and ambient temperature in real time; determining a first heat transfer capacity index corresponding to a first heat transfer medium and a second heat transfer capacity index corresponding to a second heat transfer medium based on the vehicle status parameters, ambient temperature, Nusselt number, and forced convection heat transfer correlation; calculating the relationship value between the first and second heat transfer capacity indices; and maintaining or reducing a first rotational speed and increasing a second rotational speed according to heat dissipation requirements when the relationship value is greater than or equal to a first preset threshold.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a vehicle thermal management control method, device, computer equipment, and storage medium. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the vehicle thermal management system plays a crucial role in ensuring battery safety, improving motor and electronic control efficiency, and extending driving range. The thermal management system of an electric vehicle typically includes multiple actuators, among which the cooling fan and electric water pump are the two most critical components in the liquid cooling circulation system. In related technologies, the control of the cooling fan and electric water pump mainly employs either a lookup table method or a PID (Proportional-Integral-Derivative) feedback control strategy. The basic principle is that when the sensor detects that the coolant temperature exceeds the target threshold, the controller simultaneously increases the speed of both the fan and the water pump to enhance heat dissipation.

[0003] However, the above control method has shortcomings in practical applications. Under complex driving conditions, the heat dissipation capacity of the wind side and the water side is not linearly related. For example, when the vehicle is traveling at high speed and under low load conditions (such as downhill or steady speed on a flat road), the oncoming wind speed is extremely high. At this time, the heat transfer coefficient of the radiator under natural air intake is already close to saturation. If the coolant temperature rises slightly due to instantaneous load, the above control strategy will still forcibly increase the fan speed according to the preset logic. In this case, further increasing the fan speed will not only fail to significantly enhance the heat dissipation effect, but will also consume battery power and increase unnecessary vehicle energy consumption. Summary of the Invention

[0004] Based on this, a vehicle thermal management control method, device, computer equipment, and storage medium are provided to solve the problem of inaccurate traditional automotive thermal management control.

[0005] In a first aspect, this application provides a vehicle thermal management control method, the method comprising: The vehicle status parameters and ambient temperature are acquired in real time; wherein, the vehicle status parameters include the first rotation speed of the first thermal management device, the second rotation speed of the second thermal management device, and the coolant temperature, the first thermal management device corresponds to the first heat exchange medium, and the second thermal management device corresponds to the second heat exchange medium; Based on the vehicle status parameters, the ambient temperature, the Nusselt number and the forced convection heat transfer correlation, the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium are determined. Calculate the relationship value between the first heat exchange capacity index and the second heat exchange capacity index, wherein the relationship value includes any one of ratio, difference and weighted value; If the relationship value is greater than or equal to a first preset threshold, the first rotation speed is maintained or reduced, and the second rotation speed is increased according to the heat dissipation requirement; wherein the heat dissipation requirement is determined based on the deviation between the coolant temperature and the preset target temperature.

[0006] Optionally, based on the vehicle state parameters, the ambient temperature, and in conjunction with the Nusselt number and the forced convection heat transfer correlation, the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium are determined, including: determining the first heat transfer capacity index based on the first rotational speed, the ambient temperature, and in conjunction with the Nusselt number and the forced convection heat transfer correlation corresponding to the first heat transfer medium; and determining the second heat transfer capacity index based on the second rotational speed, the ambient temperature, and in conjunction with the Nusselt number and the forced convection heat transfer correlation corresponding to the second heat transfer medium.

[0007] Optionally, the method further includes: if the relationship value is less than the first preset threshold, determining whether the relationship value is less than or equal to a second preset threshold; if the relationship value is less than or equal to the second preset threshold, maintaining or reducing the second rotation speed, and increasing the first rotation speed according to the heat dissipation requirements.

[0008] Optionally, after determining whether the relationship value is less than or equal to a second preset threshold, the method further includes: if the relationship value is greater than the second preset threshold, obtaining the current system heat transfer coefficient, the current first power of the first thermal management device, and the current second power of the second thermal management device; determining the first weight corresponding to the first thermal management device and the second weight corresponding to the second thermal management device based on the system heat transfer coefficient, the first power, and the second power; dividing the heat dissipation demand into a first heat dissipation demand and a second heat dissipation demand according to the first weight and the second weight; and adjusting the first rotation speed and the second rotation speed accordingly based on the first heat dissipation demand and the second heat dissipation demand.

[0009] Optionally, after determining whether the relationship value is less than or equal to a second preset threshold, the method further includes: if the relationship value is greater than the second preset threshold, then, based on the heat dissipation requirement, determining the first duty cycle of the first thermal management device and the second duty cycle of the second thermal management device corresponding to the heat dissipation requirement from a pre-constructed control table; determining a first target speed based on the first duty cycle and a second target speed based on the second duty cycle; wherein the sum of the power corresponding to the first target speed and the power corresponding to the second target speed satisfies a preset requirement; adjusting the first speed to the first target speed and adjusting the second speed to the second target speed.

[0010] Optionally, the first heat exchange capacity index and the second heat exchange capacity index are respectively expressed as: ; ; in, This indicates the first heat exchange capacity index. This indicates the flow rate of the first heat exchange medium. Determined based on the first rotational speed This represents the empirical index corresponding to the first heat exchange medium. This represents the rate of change of heat capacity corresponding to the first heat exchange medium. This indicates the second heat exchange capacity index. This indicates the flow rate of the second heat exchange medium. Determined based on the second rotational speed. This represents the empirical index corresponding to the second heat exchange medium. This represents the rate of change of heat capacity corresponding to the second heat exchange medium. and stated The values ​​are determined based on the ambient temperature, combined with their respective Nusselt numbers and forced convection heat transfer correlations.

[0011] Optionally, the formulas for calculating the first weight and the second weight are as follows: , , , ; in, This represents the current heat transfer coefficient of the system. This indicates the first power. This indicates the effect of the change in the first power on the heat transfer coefficient of the system. This indicates the second power. This indicates the effect of the change in the second power on the heat transfer coefficient of the system. This represents the first weight. This represents the second weight.

[0012] Secondly, this application provides a vehicle thermal management control device, the device comprising: The acquisition module is used to acquire vehicle status parameters and ambient temperature in real time; wherein, the vehicle status parameters include a first rotation speed of a first thermal management device, a second rotation speed of a second thermal management device, and coolant temperature, the first thermal management device corresponds to a first heat exchange medium, and the second thermal management device corresponds to a second heat exchange medium; The determination module is used to determine the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium based on the vehicle status parameters, the ambient temperature, the Nusselt number and the forced convection heat transfer correlation. The calculation module is used to calculate the relationship value between the first heat exchange capacity index and the second heat exchange capacity index, wherein the relationship value includes any one of ratio, difference and weighted value; The control module is configured to maintain or reduce the first rotational speed when the relationship value is greater than or equal to a first preset threshold, and increase the second rotational speed according to the heat dissipation requirement; wherein the heat dissipation requirement is determined based on the deviation between the coolant temperature and the preset target temperature.

[0013] Optionally, the determining module is specifically used to determine the first heat transfer capacity index based on the first rotational speed, the ambient temperature, the Nusselt number corresponding to the first heat transfer medium, and the forced convection heat transfer correlation; and to determine the second heat transfer capacity index based on the second rotational speed, the ambient temperature, the Nusselt number corresponding to the second heat transfer medium, and the forced convection heat transfer correlation.

[0014] Optionally, the device is further configured to determine whether the relationship value is less than or equal to a second preset threshold when the relationship value is less than the first preset threshold; if the relationship value is less than or equal to the second preset threshold, then maintain or reduce the second rotation speed, and increase the first rotation speed according to the heat dissipation requirements.

[0015] Optionally, the device is further configured to, if the relationship value is greater than the second preset threshold, obtain the current system heat transfer coefficient, the current first power of the first thermal management device, and the current second power of the second thermal management device; determine the first weight corresponding to the first thermal management device and the second weight corresponding to the second thermal management device based on the system heat transfer coefficient, the first power, and the second power; divide the heat dissipation demand into a first heat dissipation demand and a second heat dissipation demand according to the first weight and the second weight; and adjust the first rotation speed and the second rotation speed accordingly based on the first heat dissipation demand and the second heat dissipation demand.

[0016] Optionally, the device is further configured to, if the relationship value is greater than the second preset threshold, determine, according to the heat dissipation requirement, from a pre-constructed control table the first duty cycle of the first thermal management device and the second duty cycle of the second thermal management device corresponding to the heat dissipation requirement; determine a first target speed according to the first duty cycle, and determine a second target speed according to the second duty cycle; wherein the sum of the power corresponding to the first target speed and the power corresponding to the second target speed satisfies a preset requirement; adjust the first speed to the first target speed, and adjust the second speed to the second target speed.

[0017] Optionally, the first heat exchange capacity index and the second heat exchange capacity index are respectively expressed as: ; ; in, This indicates the first heat exchange capacity index. This indicates the flow rate of the first heat exchange medium. Determined based on the first rotational speed This represents the empirical index corresponding to the first heat exchange medium. This represents the rate of change of heat capacity corresponding to the first heat exchange medium. This indicates the second heat exchange capacity index. This indicates the flow rate of the second heat exchange medium. Determined based on the second rotational speed. This represents the empirical index corresponding to the second heat exchange medium. This represents the rate of change of heat capacity corresponding to the second heat exchange medium. and stated The values ​​are determined based on the ambient temperature, combined with their respective Nusselt numbers and forced convection heat transfer correlations.

[0018] Optionally, the formulas for calculating the first weight and the second weight are as follows: , , , ; in, This represents the current heat transfer coefficient of the system. This indicates the first power. This indicates the effect of the change in the first power on the heat transfer coefficient of the system. This indicates the second power. This indicates the effect of the change in the second power on the heat transfer coefficient of the system. This represents the first weight. This represents the second weight.

[0019] Thirdly, this application provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the vehicle thermal management control method of the first aspect described above.

[0020] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the vehicle thermal management control method of the first aspect described above.

[0021] The aforementioned vehicle thermal management control method, device, computer equipment, and storage medium, by calculating the relationship between the first heat exchange capacity index corresponding to the first thermal management device and the second heat exchange capacity index corresponding to the second thermal management device, identify whether the current heat exchange limitation is on the first thermal management device side or the second thermal management device side, thereby formulating differentiated control strategies, achieving precise control of the first thermal management device and the second thermal management device, and thus improving the system heat exchange effect and reducing energy waste. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating a vehicle thermal management control method in one embodiment; Figure 2 This is a schematic diagram of the structure of a vehicle thermal management device in one embodiment; Figure 3 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The specific operational methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of this application, "multiple" is understood as "at least two". "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing together, or B existing alone. A connected to B can represent: A and B directly connected, or A and B connected through C. Furthermore, in the description of this application, terms such as "first" and "second" are used only for distinguishing the purpose of description and should not be construed as indicating or implying relative importance or order.

[0024] In this application, the acquisition, transmission, storage, and use of data all comply with the requirements of relevant national laws and regulations.

[0025] The technical solution provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a flowchart illustrating a vehicle thermal management control method in one embodiment. This process can be executed by a vehicle thermal management control device, which can be implemented via software, hardware, or a combination of both. Figure 1 As shown, the process includes the following steps: S101, which acquires vehicle status parameters and ambient temperature in real time.

[0027] In some embodiments, the vehicle status parameters include a first rotational speed of the first thermal management device, a second rotational speed of the second thermal management device, and coolant temperature. Optionally, the first thermal management device can be an electric water pump, and the second thermal management device can be an electric fan. In this case, the first heat exchange medium corresponding to the first thermal management device is coolant, and the second heat exchange medium corresponding to the second thermal management device is ambient air. Optionally, the first thermal management device can be an electric compressor, and the second thermal management device can be an electric fan. In this case, the first heat exchange medium is a high-temperature, high-pressure refrigerant, and the second heat exchange medium is ambient air. Optionally, the first thermal management device can be an electric water pump, and the second thermal management device can be an electric compressor. In this case, the first heat exchange medium is coolant, and the second heat exchange medium is a low-temperature, low-pressure refrigerant. When the first or second thermal management device is an electric fan, the acquired vehicle status parameters also include vehicle speed, which is used to calculate the oncoming wind speed.

[0028] For example, when the first thermal management device is an electric water pump and the second thermal management device is an electric fan, the first rotational speed of the electric water pump (i.e., water pump speed), the second rotational speed of the electric fan (i.e., fan speed), vehicle speed, coolant temperature, and ambient temperature are acquired in real time. In some embodiments, vehicle speed can be acquired via the Controller Area Network (CAN) signal provided by the Vehicle Control Unit (VCU), water pump speed can be acquired via a water pump Hall sensor, fan speed can be acquired via a laser tachometer, coolant temperature can be acquired via a coolant temperature sensor, and ambient temperature can be acquired via a temperature sensor. This explanation only uses an electric water pump as the first thermal management device and an electric fan as the second thermal management device as an example. The first and second thermal management devices can also be the aforementioned electric compressor, depending on the actual application requirements of the vehicle, and are not limited here.

[0029] S102, based on vehicle status parameters, ambient temperature, combined with Nusselt number and forced convection heat transfer correlation, determine the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium.

[0030] In some embodiments, a first heat transfer capacity index is determined based on a first rotational speed, ambient temperature, and the Nusselt number and forced convection heat transfer correlation corresponding to the first heat transfer medium. A second heat transfer capacity index is determined based on a second rotational speed, ambient temperature, and the Nusselt number and forced convection heat transfer correlation corresponding to the second heat transfer medium. The first and second heat transfer capacity indices are expressed as follows: ; ; in, This indicates the primary heat exchange capacity indicator. This indicates the flow rate of the first heat exchange medium. Determined based on the first rotational speed. This represents the empirical index corresponding to the first heat exchange medium. This represents the rate of change of heat capacity corresponding to the first heat exchange medium. This indicates the second heat exchange capacity indicator. This indicates the flow rate of the second heat exchange medium. Determined based on the second rotational speed. This represents the empirical index corresponding to the second heat exchange medium. This represents the rate of change of heat capacity corresponding to the second heat exchange medium. and The values ​​are determined based on the ambient temperature, the corresponding Nusselt number, and the forced convection heat transfer correlation.

[0031] In some embodiments, , The calculation process is as follows: Nusselt numbers are represented as: ; in, Indicates heat transfer capacity index (or convective heat transfer coefficient). The geometric characteristic length of the heat transfer surface is represented. is the thermal conductivity. It is affected by ambient temperature and changes with the ambient temperature. In some embodiments, when the ambient temperature is within different preset temperature ranges, The corresponding values ​​are different.

[0032] The forced convection heat transfer correlation is expressed as: ;

[0033] in, , , All are empirical coefficients. Let Reynolds number be 1. This indicates the density of the fluid (i.e., the heat exchange medium). Indicates fluid velocity. This represents the viscosity coefficient. This represents the Prandtl number.

[0034] Under a specific heatsink structure , , , as well as It can be considered a constant within a certain temperature range. , , It is also a constant (empirical coefficient). Therefore, combining the above correlations for the Nusselt number and forced convection heat transfer, and merging the constant terms, we get... ,get: .

[0035] For example, when the first thermal management device is an electric water pump and the second thermal management device is an electric fan, the first heat exchange medium of the first thermal management device is coolant, and the second heat exchange medium of the second thermal management device is ambient air. In this case, the first heat exchange capacity index corresponding to the first heat exchange medium can be expressed as: ; This indicates the liquid-side heat transfer capacity index. Indicates the coolant flow rate. Coolant flow rate It is calculated based on the water pump speed. This indicates the empirical index corresponding to the coolant. This represents the rate of change of the heat capacity corresponding to the coolant. It is calculated based on the ambient temperature, the corresponding Nusselt number of the coolant, and the correlation of forced convection heat transfer. In some embodiments, It includes geometric information such as the hydraulic diameter of the cooling pipes, the number of heat dissipation pipes, and the cross-sectional area of ​​the flow path. It also includes empirical indices for heat transfer of the coolant within the pipes. The value ranges from 0.7 to 0.9.

[0036] The second heat exchange capacity index corresponding to the second heat exchange medium can be expressed as: ; This indicates the wind-side heat exchange capacity index. This indicates the wind speed at the front. It was calculated based on the vehicle speed and fan speed. This represents an empirical index corresponding to ambient air quality. This represents the rate of change of the heat capacity of the ambient air. It is calculated based on the ambient temperature, the corresponding Nusselt number for ambient air, and the correlation between forced convection heat transfer. In some embodiments, This includes geometric information such as fan fin pitch, louver opening angle, fin thickness, and radiator frontal area. Empirical index for ambient air heat exchange. The value ranges from 0.5 to 0.7.

[0037] S103, calculate the relationship between the first heat exchange capacity index and the second heat exchange capacity index.

[0038] In some embodiments, bottleneck identification is performed based on a first heat exchange capacity index and a second heat exchange capacity index, i.e., identifying whether the current heat exchange limitation of the entire vehicle is on the first heat exchange medium side or the second heat exchange medium side. The relationship value between the first and second heat exchange capacity indices is calculated. This relationship value serves as the indicator for bottleneck identification.

[0039] In some embodiments, the relationship value can be a ratio, a difference, or a weighted value. This application does not impose specific restrictions, and the choice can be made according to the actual application.

[0040] S104, when the relationship value is greater than or equal to the first preset threshold, maintain or reduce the first rotation speed, and increase the second rotation speed according to the heat dissipation requirements.

[0041] In some embodiments, it is determined whether the relationship value between the first heat exchange capacity index and the second heat exchange capacity index is greater than or equal to a first preset threshold. The first preset threshold can be calculated based on the thermal resistance of the first thermal management device, the thermal resistance of the second thermal management device, and the heat exchange area expansion ratio between the first and second thermal management devices, combined with the principle of thermal resistance superposition, to determine its value range. If the relationship value is greater than or equal to the first preset threshold, the first rotational speed is maintained or reduced to the required first minimum rotational speed, and the heat dissipation demand is determined based on the coolant temperature and the preset target temperature. The second rotational speed is then increased based on this heat dissipation demand. In some embodiments, a PID (Proportional Integral Derivative) control algorithm is used to calculate the heat dissipation demand based on the deviation between the coolant temperature and the preset target temperature. This heat dissipation demand is fully allocated to the second thermal management device, and the second rotational speed is increased based on this heat dissipation demand, thereby achieving system heat exchange and cooling.

[0042] Taking an electric water pump as the first thermal management device and an electric fan as the second thermal management device as an example, the system determines whether the ratio R between the first heat exchange capacity index corresponding to the electric water pump and the second heat exchange capacity index corresponding to the electric fan is greater than or equal to a first preset threshold of 50. If the ratio R is greater than or equal to 50, the current water pump speed is maintained, or the current water pump speed is reduced to the required minimum water pump speed. A PID control algorithm is then used to calculate the heat dissipation demand based on the deviation between the coolant temperature and the preset target temperature. This heat dissipation demand is fully allocated to the fan, and the fan speed is increased accordingly to achieve system cooling.

[0043] When the relationship between the first and second heat exchange capacity indicators is greater than or equal to a first preset threshold, it indicates that the current "heat exchange bottleneck" of the system is on the second heat exchange medium side, i.e., on the second thermal management device side. At this time, the heat exchange capacity on the first heat exchange medium side is excessive, and even if the first rotation speed of the first thermal management device is increased, the cooling effect will be poor, and energy consumption will be wasted. Therefore, the control strategy at this time is to allocate all heat dissipation demand to the second heat exchange medium side, and enhance the heat exchange capacity on the second heat exchange medium side by increasing the second rotation speed of the second thermal management device, thereby achieving efficient cooling. This control strategy can achieve precise control and save resources.

[0044] In some embodiments, if the relationship value between the first heat exchange capacity index and the second heat exchange capacity index is less than a first preset threshold, it is determined whether the relationship value is less than or equal to the second preset threshold. The second preset threshold can also be calculated based on the thermal resistance of the first thermal management device, the thermal resistance of the second thermal management device, and the heat exchange area expansion ratio between the first and second thermal management devices, combined with the principle of thermal resistance superposition, to determine its value range. The second preset threshold is less than the first preset threshold.

[0045] Taking an electric water pump as the first thermal management device and an electric fan as the second thermal management device as an example, the system determines whether the ratio R between the first heat exchange capacity index corresponding to the electric water pump and the second heat exchange capacity index corresponding to the electric fan is less than or equal to a second preset threshold of 10. If the ratio R is less than or equal to 10, the current fan speed is maintained, or the current fan speed is reduced to the required minimum fan speed. A PID control algorithm is then used to calculate the heat dissipation demand based on the deviation between the coolant temperature and the preset target temperature. This heat dissipation demand is fully allocated to the water pump, and the water pump speed is increased accordingly to achieve system cooling.

[0046] When the relationship between the first and second heat exchange capacity indicators is less than or equal to a second preset threshold, it indicates that the current "heat exchange bottleneck" of the system is on the first heat exchange medium side, i.e., on the first thermal management device side. At this time, the heat exchange capacity on the second heat exchange medium side is excessive, and even if the second rotation speed of the second thermal management device is increased, the cooling effect is not good. Therefore, the control strategy at this time is to allocate all heat dissipation demand to the first heat exchange medium side, and enhance the heat exchange capacity on the first heat exchange medium side by increasing the first rotation speed of the first thermal management device, thereby achieving efficient cooling. This control strategy can achieve precise control and save resources.

[0047] In some embodiments, when the relationship between the first heat exchange capacity index and the second heat exchange capacity index is less than a first preset threshold and greater than a second preset threshold, a coordinated control strategy is adopted. In this case, the system is not in a "heat exchange bottleneck" state, and adjusting both the first and second rotational speeds can achieve good heat dissipation. To further reduce system energy consumption while dissipating heat, a coordinated control strategy is employed.

[0048] In one implementation, the cooperative control strategy includes the following steps: S201, obtain the current system heat transfer coefficient, the current first power of the first thermal management device, and the current second power of the second thermal management device.

[0049] The system heat transfer coefficient (also known as the overall heat transfer coefficient or K-value) is a physical quantity in thermodynamics that measures the overall ability of heat to be transferred from one fluid to another through a heat exchange device (such as a radiator, condenser, or evaporator). It comprehensively reflects the heat transfer efficiency of all stages in the entire heat transfer process. In some implementations, the system heat transfer coefficient can be obtained based on the total thermal resistance of the system.

[0050] S202, based on the system heat transfer coefficient, the first power, and the second power, determine the first weight corresponding to the first thermal management device and the second weight corresponding to the second thermal management device.

[0051] In some embodiments, the formulas for calculating the first weight and the second weight are as follows: , , , ; This represents the current system heat transfer coefficient. This indicates the current first power of the first thermal management device. This indicates the effect of changes in the first power on the system's heat transfer coefficient. This indicates the current second power of the second thermal management device. This indicates the effect of the change in the second power on the system's heat transfer coefficient. Indicates the first weight. This indicates the second weight.

[0052] S203 divides the heat dissipation requirements into first heat dissipation requirements and second heat dissipation requirements according to the first weight and the second weight.

[0053] S204 adjusts the first speed and the second speed according to the first heat dissipation requirement and the second heat dissipation requirement respectively.

[0054] Based on the respective influence of the first and second rotation speeds on the system's heat transfer coefficient (i.e., the first weight and the second weight), the heat dissipation demand is allocated to the first and second thermal management devices according to their corresponding weights to perform heat dissipation, so that the first and second thermal management devices can effectively exchange heat and cool the system, while minimizing the power consumption of the first and second thermal management devices.

[0055] In another implementation, the cooperative control strategy includes the following steps: S301, based on the heat dissipation requirements, determine the first duty cycle of the first thermal management device and the second duty cycle of the second thermal management device corresponding to the heat dissipation requirements from a pre-built control table.

[0056] A control table is pre-constructed through simulation or actual testing. The control table includes different heat dissipation requirements and the corresponding first duty cycle of the first thermal management device and the second duty cycle of the second thermal management device for each requirement. Using the heat dissipation requirement as the query condition, the corresponding first and second duty cycles are retrieved from the control table. For example, when the first thermal management device is an electric water pump and the second thermal management device is an electric fan, the pre-constructed control table is queried according to the heat dissipation requirement to obtain the water pump duty cycle and the electric fan duty cycle, respectively.

[0057] S302, determine the first target speed according to the first duty cycle, and determine the second target speed according to the second duty cycle.

[0058] In some implementations, the first target speed can be calculated based on the first duty cycle and the rated speed of the first thermal management device, and the second target speed can be calculated based on the second duty cycle and the rated speed of the second thermal management device. In some implementations, the first target speed and the second target speed can also be determined by consulting the duty cycle-speed comparison table corresponding to the first thermal management device and the second thermal management device, respectively.

[0059] For example, when the first thermal management device is an electric water pump and the second thermal management device is an electric fan, the target water pump speed can be calculated based on the water pump duty cycle and the water pump rated speed, and the target fan speed can be calculated based on the fan duty cycle and the fan rated speed. Alternatively, the target water pump speed and target fan speed can be determined by looking up tables, such as water pump duty cycle-speed comparison tables and fan duty cycle-speed comparison tables.

[0060] In some embodiments, the sum of the power corresponding to the first target rotational speed and the power corresponding to the second target rotational speed meets a preset requirement. That is, when constructing the control table, from multiple combinations of first and second duty cycles corresponding to the heat dissipation requirements, the group that minimizes the sum of the power of the first thermal management device and the power of the second thermal management device is selected as the table data. The power of the first thermal management device can be calculated based on the rotational speed corresponding to the first duty cycle, and the power of the second thermal management device can be calculated based on the rotational speed corresponding to the second duty cycle.

[0061] S303, adjust the first speed to the first target speed, and adjust the second speed to the second target speed.

[0062] By using a pre-built control table, a first target speed and a second target speed are determined based on the heat dissipation requirements. The current first speed is adjusted to the first target speed, and the current second speed is adjusted to the second target speed, thereby achieving efficient cooling of the system while minimizing system energy consumption.

[0063] The vehicle thermal management control method provided in this application is applicable to any scenario involving heat exchange between two heat exchange media (such as liquid-gas, liquid-liquid, refrigerant-gas, and refrigerant-liquid). By calculating the relationship between the heat exchange capacity indices of the two heat exchange media (such as ratios), it identifies which side of the vehicle's thermal management system is experiencing a "heat exchange bottleneck," thereby precisely allocating power for targeted heat exchange control, improving the heat exchange effect of the vehicle's thermal management system, and reducing energy waste.

[0064] It should be understood that, although Figure 1The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0065] In one embodiment, such as Figure 2 As shown, a vehicle thermal management control device is provided, comprising: The acquisition module 401 is used to acquire vehicle status parameters and ambient temperature in real time; wherein, the vehicle status parameters include the first rotation speed of the first thermal management device, the second rotation speed of the second thermal management device, and the coolant temperature, the first thermal management device corresponds to the first heat exchange medium, and the second thermal management device corresponds to the second heat exchange medium; The determination module 402 is used to determine the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium based on the vehicle status parameters, the ambient temperature, the Nusselt number and the forced convection heat transfer correlation. The calculation module 403 is used to calculate the relationship value between the first heat exchange capacity index and the second heat exchange capacity index, wherein the relationship value includes any one of ratio, difference and weighted value; The control module 404 is configured to maintain or reduce the first rotation speed when the relationship value is greater than or equal to a first preset threshold, and increase the second rotation speed according to the heat dissipation requirement; wherein the heat dissipation requirement is determined based on the deviation between the coolant temperature and the preset target temperature.

[0066] Specific limitations regarding the vehicle thermal management control device can be found in the limitations of the vehicle thermal management control method described above, and will not be repeated here. Each module in the aforementioned vehicle thermal management control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0067] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 3As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores vehicle thermal management control data. The network interface communicates with external terminals via a network. When the computer program is executed by the processor, it implements a vehicle thermal management control method. The display screen can be an LCD screen or an e-ink display screen. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device casing, or an external keyboard, touchpad, or mouse.

[0068] Those skilled in the art will understand that Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0069] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any step of the above-described vehicle thermal management control method.

[0070] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements any step of the above-described vehicle thermal management control method.

[0071] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vehicle thermal management control method, characterized in that, The method includes: The vehicle status parameters and ambient temperature are acquired in real time; wherein, the vehicle status parameters include the first rotation speed of the first thermal management device, the second rotation speed of the second thermal management device, and the coolant temperature, the first thermal management device corresponds to the first heat exchange medium, and the second thermal management device corresponds to the second heat exchange medium; Based on the vehicle status parameters, the ambient temperature, the Nusselt number and the forced convection heat transfer correlation, the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium are determined. Calculate the relationship value between the first heat exchange capacity index and the second heat exchange capacity index, wherein the relationship value includes any one of ratio, difference and weighted value; If the relationship value is greater than or equal to a first preset threshold, the first rotation speed is maintained or reduced, and the second rotation speed is increased according to the heat dissipation requirement; wherein the heat dissipation requirement is determined based on the deviation between the coolant temperature and the preset target temperature.

2. The method according to claim 1, characterized in that, Based on the vehicle status parameters and the ambient temperature, combined with the Nusselt number and the forced convection heat transfer correlation, the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium are determined, including: The first heat transfer capacity index is determined based on the first rotation speed, the ambient temperature, the Nusselt number corresponding to the first heat transfer medium, and the forced convection heat transfer correlation. The second heat transfer capacity index is determined based on the second rotational speed, the ambient temperature, the Nusselt number corresponding to the second heat transfer medium, and the forced convection heat transfer correlation.

3. The method according to claim 1, characterized in that, The method further includes: If the relationship value is less than the first preset threshold, determine whether the relationship value is less than or equal to the second preset threshold; If the relationship value is less than or equal to the second preset threshold, the second rotation speed is maintained or reduced, and the first rotation speed is increased according to the heat dissipation requirements.

4. The method according to claim 3, characterized in that, After determining whether the relationship value is less than or equal to the second preset threshold, the method further includes: If the relationship value is greater than the second preset threshold, then obtain the current system heat transfer coefficient, the current first power of the first thermal management device, and the current second power of the second thermal management device; Based on the system heat transfer coefficient, the first power, and the second power, determine the first weight corresponding to the first thermal management device and the second weight corresponding to the second thermal management device; The heat dissipation requirements are divided into first heat dissipation requirements and second heat dissipation requirements according to the first weight and the second weight; The first speed and the second speed are adjusted accordingly based on the first heat dissipation requirement and the second heat dissipation requirement, respectively.

5. The method according to claim 3, characterized in that, After determining whether the relationship value is less than or equal to the second preset threshold, the method further includes: If the relationship value is greater than the second preset threshold, then based on the heat dissipation requirement, the first duty cycle of the first thermal management device and the second duty cycle of the second thermal management device corresponding to the heat dissipation requirement are determined from the pre-built control table. A first target rotational speed is determined based on the first duty cycle, and a second target rotational speed is determined based on the second duty cycle; wherein the sum of the power corresponding to the first target rotational speed and the power corresponding to the second target rotational speed satisfies a preset requirement; Adjust the first speed to the first target speed, and adjust the second speed to the second target speed.

6. The method according to claim 1, characterized in that, The first heat exchange capacity index and the second heat exchange capacity index are respectively expressed as follows: ； ； in, This indicates the first heat exchange capacity index. This indicates the flow rate of the first heat exchange medium. Determined based on the first rotational speed This represents the empirical index corresponding to the first heat exchange medium. This represents the rate of change of heat capacity corresponding to the first heat exchange medium. This indicates the second heat exchange capacity index. This indicates the flow rate of the second heat exchange medium. Determined based on the second rotational speed. This represents the empirical index corresponding to the second heat exchange medium. This represents the rate of change of heat capacity corresponding to the second heat exchange medium. and stated The values ​​are determined based on the ambient temperature, combined with their respective Nusselt numbers and forced convection heat transfer correlations.

7. The method according to claim 4, characterized in that, The formulas for calculating the first weight and the second weight are as follows: ， ， ， ； in, This represents the current heat transfer coefficient of the system. This indicates the first power. This indicates the effect of the change in the first power on the heat transfer coefficient of the system. This indicates the second power. This indicates the effect of the change in the second power on the heat transfer coefficient of the system. This represents the first weight. This represents the second weight.

8. A vehicle thermal management control device, characterized in that, The device includes: The acquisition module is used to acquire vehicle status parameters and ambient temperature in real time; wherein, the vehicle status parameters include a first rotation speed of a first thermal management device, a second rotation speed of a second thermal management device, and coolant temperature, the first thermal management device corresponds to a first heat exchange medium, and the second thermal management device corresponds to a second heat exchange medium; The determination module is used to determine the first heat transfer capacity index corresponding to the first heat transfer medium and the second heat transfer capacity index corresponding to the second heat transfer medium based on the vehicle status parameters, the ambient temperature, the Nusselt number and the forced convection heat transfer correlation. The calculation module is used to calculate the relationship value between the first heat exchange capacity index and the second heat exchange capacity index, wherein the relationship value includes any one of ratio, difference and weighted value; The control module is configured to maintain or reduce the first rotational speed when the relationship value is greater than or equal to a first preset threshold, and increase the second rotational speed according to the heat dissipation requirement; wherein the heat dissipation requirement is determined based on the deviation between the coolant temperature and the preset target temperature.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 7.

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