Automobile electronic water pump selection method and device, equipment and medium

Abstract

The application provides a method, device, equipment and medium for selecting an automotive electronic water pump, which comprises: calculating system minimum flow rates under various temperature conditions, the system minimum flow rate being the minimum required flow rate in a thermal management circuit to meet the heat dissipation or heating requirements of a battery cell; generating system resistance characteristic curves corresponding to the various temperature conditions according to a pre-established system flow resistance model; the system resistance characteristic curve is a relationship curve between the flow rate of a heat exchange medium passing through the thermal management circuit and the system flow resistance; and determining a target electronic water pump according to the system minimum flow rate and the system flow resistance in the system resistance characteristic curve, so as to improve the accuracy of electronic water pump selection.

Description

Technical Field

[0001] This application relates to the field of water pump selection technology, and in particular to a method, apparatus, equipment and medium for selecting an automotive electronic water pump. Background Technology

[0002] As a key component of the automotive thermal management system, the electric water pump is mainly used in the vehicle's cooling circuit to pressurize the coolant to ensure its circulation in the cooling system. This allows the coolant to circulate through the radiator and various heat-generating components (such as the battery pack) to remove heat.

[0003] Electric water pumps are powered by batteries. Improper selection of the electric water pump can lead to low operating efficiency or insufficient flow rate to meet heat dissipation requirements. For example, excessive power from the electric water pump will accelerate battery consumption and increase customers' range anxiety; while insufficient power from the electric water pump will reduce the battery's heat dissipation capacity, and the battery will reduce power output or even thermal runaway when operating under high temperature conditions. Summary of the Invention

[0004] This application provides a method, apparatus, equipment, and medium for selecting automotive electronic water pumps, in order to improve the accuracy of electronic water pump selection.

[0005] In a first aspect, a method for selecting an automotive electronic water pump is provided, comprising: calculating the minimum system flow rate under various temperature conditions, wherein the minimum system flow rate is the minimum required flow rate in the thermal management circuit to meet the heat dissipation or heating requirements of the battery cells; generating system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model; the system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the thermal management circuit and the system flow resistance; and determining the target electronic water pump based on the minimum system flow rate and the system flow resistance in the system resistance characteristic curve.

[0006] Preferably, the calculation of the minimum system flow rate under each temperature condition includes: calculating a first minimum flow rate to meet the heat dissipation requirements of the battery cell under a first temperature condition when the thermal management circuit is in cooling mode; and calculating a second minimum flow rate to meet the heating requirements of the battery cell under a second temperature condition when the thermal management circuit is in heating mode, wherein the first temperature is lower than the second temperature.

[0007] Preferably, generating system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model includes: determining the system flow resistance corresponding to the thermal management loop under different flow rates based on the pre-established system flow resistance model; and using the curve formed by connecting different system flow resistances as the system resistance characteristic curve.

[0008] Preferably, determining the target electronic water pump based on the system minimum flow rate and the system flow resistance in the system resistance characteristic curve includes: acquiring the QH curves of multiple candidate electronic water pumps; determining the operating flow rate of the candidate electronic water pumps under each temperature condition based on the QH curves of the candidate electronic water pumps and the system flow resistance in the system resistance characteristic curves under each temperature condition; and determining the target electronic water pump based on the magnitude of the operating flow rate of the candidate electronic water pumps under each temperature condition and the system minimum flow rate.

[0009] Preferably, determining the target electronic water pump based on the working flow rate of the candidate electronic water pump under various temperature conditions and the minimum flow rate of the system includes: obtaining the first working flow rate of the candidate electronic water pump under a first temperature condition and the second working flow rate under a second temperature condition; and selecting the candidate electronic water pump whose first working flow rate is greater than the first minimum flow rate and whose second working flow rate is greater than the second minimum flow rate as the target electronic water pump.

[0010] Preferably, the method further includes: acquiring Q-η curves of multiple target electronic water pumps; determining a first operating efficiency of the target electronic water pump at a first operating flow rate and a second operating efficiency of the target electronic water pump at a second operating flow rate based on the Q-η curves of the target electronic water pumps; calculating a benchmark operating efficiency of the target electronic water pumps based on the maximum operating efficiency in the Q-η curves of the candidate electronic water pumps; and selecting target electronic water pumps whose first and second operating efficiencies are greater than the benchmark operating efficiency as the desired electronic water pumps.

[0011] Preferably, the method further includes: acquiring QP curves of multiple target electronic water pumps; determining a first power corresponding to the target electronic water pump at a first operating flow rate and a second power corresponding to the target electronic water pump at a second operating flow rate based on the QP curves of the target electronic water pumps; and selecting target electronic water pumps whose first power and second power are less than a preset power as the desired electronic water pumps.

[0012] Secondly, an automotive electronic water pump selection device is provided, comprising: a calculation module for calculating the minimum system flow rate under various temperature conditions, wherein the minimum system flow rate is the minimum required flow rate in the thermal management loop to meet the heat dissipation or heating requirements of the battery cell; a generation module for generating system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model; wherein the system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the thermal management loop and the system flow resistance; and a determination module for determining the target electronic water pump based on the minimum system flow rate and the system flow resistance in the system resistance characteristic curve.

[0013] Thirdly, an electronic device is provided, comprising: a processor and a memory for storing a computer program, the processor for calling and running the computer program stored in the memory, and performing the methods as described in the first aspect or its various implementations.

[0014] Fourthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its various implementations.

[0015] Fifthly, a computer program product is provided, including computer program instructions that cause a computer to perform the methods as described in the first aspect or its various implementations.

[0016] Sixthly, a computer program is provided that causes a computer to perform the methods described in the first aspect or its various implementations.

[0017] The technical solution provided in this application first calculates the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management circuit to meet the heat dissipation or heating requirements of the battery cells. Then, based on a pre-established system flow resistance model, it generates system resistance characteristic curves corresponding to various temperature conditions. The system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the thermal management circuit and the system flow resistance. Finally, based on the minimum system flow rate and the system flow resistance in the system resistance characteristic curve, the target electric water pump is determined. In the above process, the electronic device can select an electric water pump based on the specific heating and heat dissipation requirements of the vehicle, while taking into account flow rate, efficiency, and power. This solves the technical bias of prior art that relies solely on the theoretical value of the electric water pump head for selection, and avoids the problems of low operating efficiency or insufficient flow rate to meet heat dissipation requirements due to improper selection of the electric water pump. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the battery pack thermal management circuit applicable to the embodiments of the present invention;

[0020] Figure 2 An application scenario diagram provided for an embodiment of this application;

[0021] Figure 3A flowchart illustrating a method for selecting an automotive electronic water pump, as provided in this application embodiment;

[0022] Figure 4 Characteristic curves of an automotive electronic water pump provided in the embodiments of this application;

[0023] Figure 5 A flowchart illustrating another method for selecting an automotive electronic water pump provided in this application embodiment;

[0024] Figure 6 A flowchart illustrating another method for selecting an automotive electronic water pump provided in this application embodiment;

[0025] Figure 7 A schematic diagram of an automotive electronic water pump selection device provided in an embodiment of this application;

[0026] Figure 8 This is a schematic block diagram of the electronic device provided in the embodiments of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0029] Figure 1 This is a schematic diagram of the thermal management circuit (or battery pack cooling circuit) in the battery pack thermal management system to which this invention is applicable, as shown in the embodiments of the present invention. Figure 1As shown, the thermal management circuit may include: a battery pack, an electric water pump, a liquid heater, a radiator, an air conditioner, and an electric three-way valve, etc. The battery pack provides electrical energy to the electric vehicle. The liquid heater and radiator are connected to the battery pack through the thermal management circuit piping. A heat exchange medium flows through the thermal management circuit piping; this medium can be a fluid with heat absorption and transfer functions, such as water, oil, or coolant. Driven by the electric water pump, the heat exchange medium flows through the battery pack, liquid heater, and radiator in the thermal management circuit piping. In response to different operating conditions, the battery pack exhibits different thermal characteristics, thus requiring different thermal management controls. Figure 1 As shown, the battery pack thermal management circuit has three thermal management modes: slow cooling mode, which is when the battery pack cell temperature is within the normal range, such as 20℃~45℃, and heat dissipation can be achieved through the heat sink; fast cooling mode, which is a rapid cooling mode, where the battery pack cell temperature is relatively high and air conditioning is required for heat dissipation; and heating mode, where the battery pack cell temperature is relatively low and a liquid heater is required for heating.

[0030] Since the electric water pump provides the power for the circulation of the heat exchange medium in the battery pack's thermal management circuit, its selection determines the flow rate and velocity of the heat exchange medium in the circuit, directly impacting the radiator's performance. An oversized electric water pump will accelerate battery drain, hindering energy conservation, while an undersized pump will fail to meet the flow rate and pressure requirements of the heat exchange medium circulation in the battery pack's thermal management circuit. In reality, due to differences in the piping routing and component installation locations in the thermal management circuits of different vehicle models, and the inability to predict parameters such as flow resistance and temperature drop of key electrical equipment, these differences directly affect system flow resistance and cooling efficiency. All these factors influence the matching selection of the electric water pump's head and flow rate. Current designs rely solely on reference parameters for individual components provided by manufacturers, resulting in low accuracy in electric water pump selection.

[0031] To address the aforementioned technical problems, the inventive concept of this application is as follows: First, calculate the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management circuit to meet the heat dissipation or heating requirements of the battery cells. Then, based on a pre-established system flow resistance model, generate system resistance characteristic curves corresponding to each temperature condition. The system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the thermal management circuit and the system flow resistance. Finally, determine the target electric water pump based on the minimum system flow rate and the system flow resistance in the system resistance characteristic curve. In this process, the electronic device can select the electric water pump according to the specific heating and cooling requirements of the vehicle, thereby solving the technical bias of relying solely on the theoretical value of the electric water pump head in the prior art, and avoiding the problems of low operating efficiency or insufficient flow rate to meet heat dissipation requirements due to improper selection of the electric water pump.

[0032] It should be understood that the technical solution of this application can be applied to the following scenarios, but is not limited to:

[0033] In some possible ways, Figure 2 An application scenario diagram provided for an embodiment of this application, such as... Figure 2 As shown, this application scenario may include electronic device 110 and network device 120. Electronic device 110 can establish a connection with network device 120 through a wired network or a wireless network.

[0034] For example, electronic device 110 may be a battery management module installed in a vehicle, or a terminal device such as a desktop computer, laptop computer, or tablet computer, but is not limited thereto. Network device 120 may be a terminal device or a server, but is not limited thereto.

[0035] also, Figure 2 An electronic device and a network device are given as examples, but in practice, other numbers of electronic devices and network devices may be included, and this application does not limit this.

[0036] In other possible implementations, the technical solution of this application may also be executed by the aforementioned electronic device 110, or by the aforementioned network device 120, and this application does not impose any restrictions on this.

[0037] After introducing the application scenarios of the embodiments of this application, the technical solution of this application will be described in detail below:

[0038] Figure 3 A flowchart illustrating a method for selecting an automotive electronic water pump, provided in this application embodiment, is available. This method can be performed by, for example... Figure 2 The electronic device 110 shown performs, but is not limited to, its functions. For example... Figure 3 As shown, the method may include the following steps:

[0039] S310: Calculate the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management loop to meet the heat dissipation or heating requirements of the battery cells.

[0040] It is understandable that when the battery pack thermal management circuit is in slow cooling mode, that is, when the battery pack cell temperature is within the normal range, heat can be dissipated through the heat sink. When the system flow in slow cooling mode cannot meet the heat dissipation requirements, the electric three-way valve can be controlled to switch to fast cooling mode. Therefore, there is no need to consider the minimum system flow in slow cooling mode.

[0041] Correspondingly, this step involves calculating the system's minimum flow rate under various temperature conditions, which may specifically include:

[0042] When the thermal management circuit is in cooling mode, the first minimum flow rate to meet the heat dissipation requirements of the battery cell under the first temperature condition is calculated. That is, when the thermal management circuit is in fast cooling mode, i.e., under the condition that the inlet water temperature is the first temperature T1, the minimum system cooling flow rate to meet the heat dissipation requirements of the battery cell is calculated. And when the thermal management circuit is in heating mode, the second minimum flow rate to meet the heating requirements of the battery cell under the second temperature condition is calculated. That is, when the thermal management circuit is in heating mode, i.e., under the condition that the inlet water temperature is the second temperature T2, the minimum system heating flow rate to meet the heating requirements of the battery cell is calculated. Wherein, the first temperature T1 is less than the second temperature T2.

[0043] S320: Based on the pre-established system flow resistance model, generate system resistance characteristic curves corresponding to various temperature conditions; the system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the thermal management loop and the system flow resistance.

[0044] In this embodiment, the "system flow resistance model" is pre-built to generate the corresponding system flow resistance based on the system flow rate. Moreover, this embodiment does not limit the construction process of the "system flow resistance model". For example, it can be implemented using any existing or future fluid simulation method.

[0045] For example, a fluid domain can be extracted from the thermal management loop, and then a system flow resistance simulation model can be established based on this fluid domain. There are various methods for extracting the fluid domain from the thermal management loop, such as using Boolean operations in CATIA software or extracting the fluid domain in STAR-CCM+ software. Then, the simulation software is used to further perform mesh generation and condition settings, and different inlet flow rates are set. Finally, the system flow resistance values ​​corresponding to different flow rates are obtained. Connecting the different system flow resistance values ​​into a smooth curve yields the system's resistance characteristic curve.

[0046] S330: Determine the target electric water pump based on the system's minimum flow rate and the system flow resistance in the system resistance characteristic curve.

[0047] It is understandable that the flow rate of an electronic water pump is a range value. For example, the flow rate range of a certain model of electronic water pump is 0 to 35 L / min. The actual working flow rate of the electronic water pump installed in the thermal management circuit depends on the system flow resistance of the thermal management circuit. The system flow resistance is different under different temperature conditions. When the system flow resistance at a certain flow rate is equal to the head of the electronic water pump at a certain flow rate, then that flow rate is the actual working flow rate of the electronic water pump.

[0048] This application provides a method for selecting an automotive electronic water pump. Based on the characteristics of the battery thermal management circuit, the system flow resistance is first calculated under different temperature conditions, namely fast cooling mode and heating mode. The system flow resistance is then used as the head of the electronic water pump. Finally, the actual operating flow rate of the electronic water pump corresponding to the head under different temperature conditions is used as the basis for selecting the electronic water pump, combined with the minimum system flow rate. This approach overcomes the problem in existing technologies that rely solely on electronic water pump parameter information for selection, neglecting the adaptability of the electronic water pump under different temperature conditions. It avoids problems such as low operating efficiency or insufficient flow rate to meet heat dissipation requirements due to improper electronic water pump selection.

[0049] In order to accurately calculate the minimum system flow rate under various temperature conditions, in one possible implementation, the above-mentioned S310 may further include:

[0050] S410: Obtain the cell attribute information in the thermal management circuit, wherein the cell attribute information includes at least the number of cells, the operating current of the cells, and the cell resistance.

[0051] Understandably, the number of battery cells and their resistance can be obtained by consulting the battery pack's electrical design drawings or instruction manual. For example, if a certain model of battery pack includes a battery module that uses a 3-parallel 96-series configuration, then the number of battery cells is 288.

[0052] S420: Calculates the heat generation of the battery cell based on its attribute information;

[0053] For example, when the thermal management circuit is in fast cooling mode, i.e., the inlet water temperature is the first temperature T1, if the battery pack is required to continuously discharge for 30 minutes at an operating voltage of 350V and a power of 60kW, and the cell temperature needs to be below 45℃, then under this operating condition, the heat generated by the cell during operation can be calculated based on the cell power, i.e., the heat generated by the cell P can be:

[0054] P = n * I 2 R (1)

[0055] Where n is the number of battery cells, I is the battery cell current, and R is the battery cell resistance.

[0056] For example, assuming the battery pack uses a 3-parallel, 96-series configuration, the number of cells n is 288, and the cell resistance R is 0.002Ω. Then, the heat generated by the cells P = 288 * (60kW / 350V / 3). 2 *0.002=1880.8W.

[0057] S430: Obtain the property information of the heat exchange medium in the thermal management loop. The property information of the heat exchange medium includes at least the specific heat capacity of the heat exchange medium and the heat exchange temperature difference between the inlet and outlet of the heat exchange medium.

[0058] Understandably, the thermal management loop piping carries a heat exchange medium, which can be a fluid medium with heat absorption and transfer functions, such as water, oil, or coolant. Driven by an electric water pump, the heat exchange medium flows through the battery pack, liquid heater, and radiator in the thermal management loop piping.

[0059] For example, if the heat exchange medium is a coolant, the specific heat capacity of the coolant can be 3300 J / (kg·K). The heat exchange temperature difference between the inlet and outlet of the heat exchange medium can be preset, and the embodiments of this application do not limit the preset heat exchange temperature difference. For example, it can be 2.5℃.

[0060] S440: Determine the minimum system flow rate based on the specific heat capacity of the heat exchange medium, the heat exchange temperature difference between the inlet and outlet of the heat exchange medium, and the functional relationship between the minimum system flow rate and the heat generated by the battery cell.

[0061] It should be noted that the heat generated by the battery cell is completely carried away by the flow of coolant within the thermal management circuit. The specific heat capacity of the coolant absorbs the heat generated by the battery cell during operation. Therefore, the heat exchange capacity of the coolant can be considered equal to the heat generated by the battery cell. Based on this, the heat exchange medium heat transfer capacity Q is:

[0062] Q=cmΔT (2)

[0063] Where c is the specific heat capacity of the heat exchange medium, m is the mass of the heat exchange medium, and ΔT is the heat exchange temperature difference between the inlet and outlet of the heat exchange medium.

[0064] For example, the heat generation P of the battery cell is 1880.8W. According to the principle that the heat generation P of the battery cell is equal to the heat transfer medium Q, we know that:

[0065] 1880.8W=3300J / (kg·K)*{Q1*1071.11kg / m 3 / 1000 / 60}*2.5=147.3*Q1

[0066] The minimum system flow rate Q1 can be calculated to be 12.8 L / min. Here, 1071.11 kg / m3 / 1000 / 60 is the conversion of the minimum system flow rate unit L / min to kg / s.

[0067] It should be noted that the execution order of S410 and S430 is not limited in this application embodiment. In another embodiment, they can also be executed in the order of S430-S410-S420-S440.

[0068] For example, the electronic device can send a request message to a terminal device or a network device such as a server. This request message requests information about the battery cell attributes and the heat exchange medium attributes in the thermal management loop. Further, the electronic device can receive a response message from the network device, which includes the battery cell attribute information and the heat exchange medium attribute information. Then, the electronic device can calculate the minimum system flow rate based on the battery cell attribute information and the heat exchange medium attribute information.

[0069] It should be noted that this application does not restrict the specific content of the cell attribute information and the heat exchange medium attribute information, or the way the electronic device obtains the corresponding attribute information.

[0070] In another implementation, the minimum system flow rate in S310 can also be obtained through thermal simulation analysis. For example, the battery pack is first geometrically modeled using fluid simulation software (such as Star-CCM software). When modeling, secondary features can be ignored and only the main features can be retained. Then, physical property parameters and boundary conditions are further set in the fluid simulation software, and the heat generation of the battery cell is calculated according to the actual discharge conditions and substituted into the simulation model. Since water cooling heat dissipation, natural heat transfer can be ignored, and only the boundary conditions of inlet water temperature and inlet flow rate can be retained.

[0071] Furthermore, when the thermal management loop is in fast cooling mode, i.e. the inlet water temperature is set to the first temperature T1, simulation is performed by setting different inlet flow rates to obtain the highest cell temperature corresponding to different inlet flow rates. The flow rate corresponding to the highest cell temperature ≤ 45℃ is the minimum cooling flow rate Q1 of the system.

[0072] Accordingly, when the thermal management circuit is in heating mode, i.e. the water inlet temperature is set to the second temperature T2, the battery is required to be heated from -20℃ to 10℃ within 1 hour under the condition of the second temperature T2. This operating condition is used to confirm the minimum heating flow rate Q2 of the system that meets the cell heating requirements in the heating mode.

[0073] It should be noted that the embodiments of this application do not limit the simulation process of the thermal simulation model. For example, any existing or future method that can simulate the minimum flow rate of the system can be used for implementation.

[0074] In addition, to further improve the accuracy of selecting the target electronic water pump, Figure 5 A flowchart illustrating another method for selecting an automotive electronic water pump, provided in an embodiment of this application. Figure 5 As shown, the above S330 may include:

[0075] S510: Obtain the QH curves of multiple candidate electric water pumps.

[0076] In this step, the candidate electronic water pump is the electronic water pump to be selected, and there can be multiple of them. For example, the target electronic water pump can be selected from 10 candidate electronic water pumps using the method of the embodiment of the present invention. The QH curve (i.e., flow-head curve) of the electronic water pump is one of the important characteristic curves of the electronic water pump, reflecting the relationship between flow and head. It can be obtained in advance from the specification of the electronic water pump.

[0077] S520: Based on the QH curve of the candidate electronic water pump and the system flow resistance in the system resistance characteristic curve under various temperature conditions, determine the actual operating flow rate of the candidate electronic water pump under various temperature conditions.

[0078] It is understandable that the flow rate of an electronic water pump is a range value. For example, the flow rate range of a certain model of electronic water pump is 0 to 35 L / min. The actual working flow rate of the electronic water pump installed in the thermal management circuit depends on the system flow resistance of the thermal management circuit, and the system flow resistance is different under different temperature conditions.

[0079] For example, Figure 4 The characteristic curve of the automotive electronic water pump provided in the embodiment of the present invention is shown in the figure below. Figure 4 As shown in the figure, the QH curve, QP curve (i.e., flow-power curve), and Q-η curve (i.e., flow-efficiency curve) of the candidate electronic water pump are illustrated. The figure also shows the system resistance characteristic curves S1 and S2 of the candidate electronic water pump at the first temperature T1 and the second temperature T2, respectively. It is understood that the horizontal and vertical axes of the above curves can be synchronously mapped to the same Cartesian coordinate system. For example, the horizontal axis of the system resistance characteristic curves S1 and S2 is the flow rate Q, and the vertical axis is the system impedance at the first temperature T1 and the system impedance at the second temperature T2, respectively. Correspondingly, the horizontal axis of the QH curve of the candidate electronic water pump is the flow rate Q, and the vertical axis is the head H. In this embodiment, the first temperature T1 corresponds to a cooling mode in the thermal management circuit, and the second temperature T1 corresponds to a heating mode in the thermal management circuit. Since the cooling water temperature is lower than the heating water temperature (i.e., first temperature T1 < second temperature T2), and because the lower the temperature, the greater the liquid viscosity, the greater the resistance (i.e., S1 > S2).

[0080] Furthermore, when the system flow resistance at a certain flow rate and the head of the candidate electronic water pump at that flow rate are equal, then that flow rate is the actual operating flow rate of the candidate electronic water pump. For example, the intersection of the system resistance characteristic curve S1 and the candidate electronic water pump's QH curve is taken as the fan's operating point 1. Similarly, the intersection of the system resistance characteristic curve S2 and the candidate electronic water pump's QH curve is taken as the fan's operating point 2. The abscissa of operating point 1 is the actual operating flow rate q1 of the candidate electronic water pump under the first temperature T1 condition, and the abscissa of operating point 2 is the actual operating flow rate q2 of the candidate electronic water pump under the second temperature T2 condition.

[0081] S530: Determine the target electronic water pump based on the actual operating flow rate of the candidate electronic water pump under various temperature conditions and the minimum flow rate of the system.

[0082] Understandably, in order to remove all the heat generated by the battery cells through the coolant flow, the flow rate at operating point 1 needs to be greater than the system's minimum cooling flow rate Q1, and correspondingly, the flow rate at operating point 2 needs to be greater than the system's minimum heating flow rate Q2. Based on the aforementioned S520, the electronic device obtains the actual operating flow rate q1 of the candidate electronic water pump under the first temperature T1 condition and the actual operating flow rate q2 under the second temperature T2 condition, and selects the candidate electronic water pump whose actual operating flow rate q1 is greater than the minimum cooling flow rate Q1 and whose actual operating flow rate q2 is greater than the system's minimum heating flow rate Q2 as the target electronic water pump.

[0083] It should be noted that there can be multiple target electronic water pumps. For example, the method of this embodiment can be used to select 3 target electronic water pumps from 10 candidate electronic water pumps, and any one of the 3 target electronic water pumps is the desired electronic water pump.

[0084] In practical applications, if the candidate electric water pump cannot meet the above flow requirements, the system's resistance characteristic curve can be optimized. For example, the system flow resistance can be reduced by reducing bends, increasing the inlet pipe diameter, adding parallel circuits or reducing series circuits, or an electric water pump with a large head or flow rate can be selected.

[0085] To further improve the accuracy of the selection of the aforementioned electronic water pump, this application also provides another possible implementation of the automotive electronic water pump selection method. This implementation not only considers the specific heating and cooling requirements of the vehicle but also takes into account the flow rate and efficiency of the electronic water pump. Figure 6 A flowchart illustrating another method for selecting an automotive electronic water pump, provided in an embodiment of this application. Figure 6 As shown, after S530 above, this method may further include:

[0086] S540: Obtain the Q-η curves of multiple target electric water pumps.

[0087] In this step, the target electronic water pump is the electronic water pump initially determined in step S530. There can be multiple such pumps. The Q-η curve of the electronic water pump is one of the important characteristic curves of the electronic water pump, reflecting the relationship between flow rate and efficiency. It can be obtained in advance from the specifications of the electronic water pump.

[0088] S550: Based on the Q-η curve of the target electronic water pump, determine the first operating efficiency of the target electronic water pump at the first operating flow rate and the second operating efficiency of the target electronic water pump at the second operating flow rate.

[0089] For example, the first operating efficiency of the target electronic water pump at the first operating flow rate is the operating efficiency η1 corresponding to the actual operating flow rate q1 of the target electronic water pump under the first temperature T1 condition. Correspondingly, the second operating efficiency of the target electronic water pump at the second operating flow rate is the operating efficiency η2 corresponding to the actual operating flow rate q2 of the target electronic water pump under the second temperature T2 condition. Specifically, by mapping the actual operating flow rate q1 under the first temperature T1 condition and the actual operating flow rate q2 under the second temperature T2 condition to the Q-η curve of the target electronic water pump, the first operating efficiency η1 and the second operating efficiency η2 can be obtained.

[0090] S560: Calculate the baseline operating efficiency of the target electronic water pump based on the maximum operating efficiency in the Q-η curve of the target electronic water pump.

[0091] It is understood that the Q-η curve of the electronic water pump is parabolic. The ordinate corresponding to the highest point of the Q-η curve is the maximum operating efficiency of the electronic water pump. The benchmark operating efficiency is used as the evaluation standard for the first operating efficiency η1 and the second operating efficiency η2 of the target electronic water pump. It can be preset by human intervention. Moreover, the embodiments of this application do not limit the setting method of the benchmark operating efficiency. For example, the benchmark operating efficiency of the target electronic water pump can be 80% of the maximum operating efficiency. That is, if the maximum operating efficiency of the target electronic water pump is 35%, then the benchmark operating efficiency is 28%.

[0092] S570: Select the target electric water pump whose first and second operating efficiencies are greater than the benchmark operating efficiency as the required electric water pump.

[0093] In this embodiment, the first operating efficiency η1 of the target electronic water pump at operating point 1 and the second operating efficiency η2 at operating point 2 should both be greater than or equal to the benchmark operating efficiency to ensure the operating efficiency of the electronic water pump and prevent resource waste; otherwise, the target electronic water pump will not meet the efficiency requirements.

[0094] In practical applications, if the target electric water pump cannot meet the above efficiency requirements, the system's resistance characteristic curve can be optimized. For example, the system flow resistance can be reduced by reducing bends, increasing the inlet pipe diameter, adding parallel circuits, or reducing series circuits. Alternatively, a high-power electric water pump can be selected.

[0095] In the above embodiments, the electronic device can select a target electronic water pump based on the actual working flow rate and operating efficiency of the electronic water pump to obtain a more accurate and scientifically sound desired electronic water pump. Compared with the prior art, which only uses the theoretical value of the electronic water pump flow rate as the selection method, this application can solve the problem of inaccurate selection due to a single selection index, and improve the accuracy of electronic water pump selection.

[0096] To further improve the accuracy of the selection of the aforementioned electronic water pump, this application embodiment also provides another possible implementation of the automotive electronic water pump selection method. This implementation not only considers the specific heating and cooling requirements of the vehicle but also takes into account the flow rate and power of the electronic water pump, resulting in a higher accuracy in selecting the electronic water pump. Accordingly, this embodiment may further include the following after S530:

[0097] S580: Obtain QP curves for multiple target electric water pumps.

[0098] In this step, the target electronic water pump is the electronic water pump initially determined in step S530. There can be multiple such pumps. The QP curve of the electronic water pump is one of the important characteristic curves of the electronic water pump, reflecting the relationship between flow rate and power. It can be obtained in advance from the specifications of the electronic water pump.

[0099] S590: Based on the QP curve of the target electronic water pump, determine the first power of the target electronic water pump at the first operating flow rate and the second power of the target electronic water pump at the second operating flow rate.

[0100] For example, the first power of the target electronic water pump at the first operating flow rate is the first power P1 corresponding to the actual operating flow rate q1 of the target electronic water pump under the first temperature T1 condition. Correspondingly, the second power of the target electronic water pump at the second operating flow rate is the second power P2 corresponding to the actual operating flow rate q2 of the target electronic water pump under the second temperature T2 condition. Specifically, by mapping the actual operating flow rate q1 under the first temperature T1 condition and the actual operating flow rate q2 under the second temperature T2 condition to the QP curve of the target electronic water pump, the first power P1 and the second power P2 can be obtained.

[0101] S600: Select the target electric water pump whose first power and second power are less than the preset power threshold as the desired electric water pump.

[0102] In this embodiment, the first power P1 of the target electronic water pump at operating point 1 and the first power P1 at operating point 2 should both be less than a preset power threshold; otherwise, the target electronic water pump does not meet the power requirements. The preset power threshold can be set manually, and this embodiment does not limit the preset power threshold. For example, the preset power threshold of the target electronic water pump can be set according to the vehicle's requirements. Since the electronic water pump is powered by a battery, a higher power output will accelerate battery consumption and increase range anxiety for customers. Therefore, the vehicle has a limit on the power of the electronic water pump, i.e., a preset power threshold. For example, if the first power P1 of the target electronic water pump at operating point 1 is 45W and the second power P2 of the target electronic water pump at operating point 2 is 35W, and if the vehicle requires the water pump power to be less than or equal to 50W during actual operation, then the target electronic water pump meets the power requirements and can be selected as the chosen electronic water pump.

[0103] In the above embodiments, the electronic equipment can select a target electronic water pump based on the actual operating flow rate and power of the electronic water pump to obtain a more accurate and scientifically sound required electronic water pump. By verifying whether the power of the electronic water pump meets the requirements of the entire vehicle, the problem of inaccurate selection due to a single selection criterion can be solved, thereby improving the accuracy of electronic water pump selection.

[0104] It should be noted that, in another possible embodiment, the electronic device can also select the target electronic water pump based on the actual operating flow rate, efficiency, and power of the electronic water pump to obtain a more accurate and scientific electronic water pump. That is, steps S510 to S600 can constitute another method for selecting an automotive electronic water pump. This method not only considers the specific heating and cooling requirements of the vehicle but also takes into account flow rate, efficiency, and power. The implementation process and technical effects of this method can be referred to the above embodiments, and will not be elaborated upon here.

[0105] Figure 7 This is a schematic diagram of an automotive electronic water pump selection device 700 provided in an embodiment of this application.

[0106] like Figure 7 As shown, the device 700 includes:

[0107] The calculation module 701 is used to calculate the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management loop to meet the heat dissipation or heating requirements of the battery cells.

[0108] The generation module 702 is used to generate system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model; the system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the heat loop system and the system flow resistance.

[0109] The determination module 703 is used to determine the target electronic water pump based on the system minimum flow rate and the system flow resistance in the system resistance characteristic curve.

[0110] In some implementations, the calculation module 701 is specifically used to: calculate a first minimum flow rate that meets the heat dissipation requirements of the battery cell under a first temperature condition when the thermal management circuit is in cooling mode, and calculate a second minimum flow rate that meets the heating requirements of the battery cell under a second temperature condition when the thermal management circuit is in heating mode, wherein the first temperature is less than the second temperature.

[0111] In some implementations, the generation module 702 is specifically used to: calculate the system flow resistance corresponding to the thermal management loop under different flow rates based on a pre-established system flow resistance model; and connect the different system flow resistances to form a curve as the system resistance characteristic curve.

[0112] In some implementations, the determining module 703 is specifically used to: acquire the QH curves of multiple candidate electronic water pumps; determine the actual operating flow rate of the candidate electronic water pumps under each temperature condition based on the QH curves of the candidate electronic water pumps and the system flow resistance in the system resistance characteristic curves under each temperature condition; and determine the target electronic water pump based on the magnitude of the actual operating flow rate of the electronic water pumps under each temperature condition and the minimum system flow rate.

[0113] In some implementations, the determining module 703 is further configured to: acquire the Q-η curves of multiple target electronic water pumps; based on the Q-η curves of the target electronic water pumps, determine the first operating efficiency of the target electronic water pumps at the first operating flow rate and the second operating efficiency of the target electronic water pumps at the second operating flow rate; calculate the reference operating efficiency of the target electronic water pumps according to the maximum operating efficiency among the Q-η curves of the candidate electronic water pumps; and select the target electronic water pumps whose first operating efficiency and second operating efficiency are greater than the reference operating efficiency as the desired electronic water pumps.

[0114] In some implementations, the determining module 703 is further configured to: acquire the QP curves of multiple target electronic water pumps; based on the QP curves of the target electronic water pumps, determine the first power of the target electronic water pump at the first operating flow rate and the second power of the target electronic water pump at the second operating flow rate; and select the target electronic water pump whose first power and second power are less than a preset power as the desired electronic water pump.

[0115] It should be understood that the device embodiments and the automotive electronic water pump selection method embodiments can correspond to each other, and similar descriptions can be found in the automotive electronic water pump selection method embodiments. To avoid repetition, further details are omitted here. Specifically, Figure 7The device 700 shown can execute the above-described embodiment of the automotive electronic water pump selection method, and the aforementioned and other operations and / or functions of each module in the device 700 are respectively for implementing the corresponding process in the above-described automotive electronic water pump selection method. For the sake of brevity, they will not be described in detail here.

[0116] The apparatus 700 of this application embodiment has been described above from the perspective of functional modules in conjunction with the accompanying drawings. It should be understood that this functional module can be implemented in hardware, in software instructions, or in a combination of hardware and software modules. Specifically, the steps of the automotive electronic water pump selection method embodiment in this application can be completed by the integrated logic circuits in the processor's hardware and / or by software instructions. The steps of the automotive electronic water pump selection method disclosed in this application embodiment can be directly manifested as execution by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. Optionally, the software module can be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. This storage medium is located in memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above-described automotive electronic water pump selection method embodiment.

[0117] Figure 8 This is a schematic block diagram of the electronic device 800 provided in an embodiment of this application. Figure 8 As shown, the electronic device 800 may include a processor 801 and a memory 802. The electronic device 800 may also include one or more of a multimedia component 803, an input / output (I / O) interface 804, and a communication component 805.

[0118] The processor 801 controls the overall operation of the electronic device 800 to complete all or part of the steps in the above-described method for selecting an automotive electronic water pump. The memory 802 stores various types of data to support the operation of the electronic device 800. This data may include, for example, instructions for any application or method operating on the electronic device 800, and application-related data such as contact data, sent and received messages, pictures, audio, video, etc. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. Multimedia component 803 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in memory 802 or transmitted via communication component 805. The audio component also includes at least one speaker for outputting audio signals. I / O interface 804 provides an interface between processor 801 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual or physical buttons. Communication component 805 is used for wired or wireless communication between the electronic device 800 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IoT, eMTC, or other 5G technologies, or combinations thereof, is not limited here. Therefore, the corresponding communication component 905 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0119] In an exemplary embodiment, the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described automotive electronic water pump selection method.

[0120] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the above-described automotive electronic water pump selection method. For example, the computer-readable storage medium may be the memory 902 including program instructions, which may be executed by the processor 801 of the electronic device 800 to complete the above-described automotive electronic water pump selection method.

[0121] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the above-described automotive electronic water pump selection method.

[0122] In another exemplary embodiment, a computer program product is also provided, the computer program product comprising a computer program executable by a programmable device, the computer program having a code portion for performing the above-described automotive electronic water pump selection method when executed by the programmable device.

[0123] In another exemplary embodiment, a computer program is also provided, which causes a computer to perform the automotive electronic water pump selection method as described above.

[0124] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0125] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0126] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. For example, the functional modules in the various embodiments of this application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0127] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for selecting an automotive electronic water pump, characterized in that, include: Calculate the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management loop to meet the heat dissipation or heating requirements of the battery cells. Based on the pre-established system flow resistance model, system resistance characteristic curves corresponding to various temperature conditions are generated; the system resistance characteristic curves are the relationship curves between the flow rate of the heat exchange medium in the thermal management loop and the system flow resistance. The target electronic water pump is determined based on the minimum flow rate of the system and the system flow resistance in the system resistance characteristic curve. The step of determining the target electronic water pump based on the system's minimum flow rate and the system flow resistance in the system resistance characteristic curve includes: Obtain the QH curves of multiple candidate electronic water pumps; the QH curves are flow rate-head curves. Based on the QH curve of the candidate electronic water pump and the system flow resistance in the system resistance characteristic curve under various temperature conditions, the actual working flow rate of the candidate electronic water pump under various temperature conditions is determined. The target electronic water pump is determined based on the actual operating flow rate of the candidate electronic water pumps under various temperature conditions and the minimum flow rate of the system. The method further includes: Obtain the Q-η curves of multiple target electronic water pumps; the Q-η curves are flow rate-efficiency curves. Based on the Q-η curve of the target electronic water pump, the first operating efficiency of the target electronic water pump at the first operating flow rate and the second operating efficiency of the target electronic water pump at the second operating flow rate are determined. The baseline operating efficiency of the target electronic water pump is calculated based on the maximum operating efficiency in the Q-η curve of the target electronic water pump. The target electronic water pump whose first and second operating efficiencies are greater than the benchmark operating efficiency is selected as the required electronic water pump; The method further includes: Obtain the QP curves of multiple target electronic water pumps; the QP curves are flow-power curves. Based on the QP curve of the target electronic water pump, determine the first power of the target electronic water pump at the first operating flow rate and the second power of the target electronic water pump at the second operating flow rate. The target electronic water pump whose first power and second power are less than a preset power threshold is selected as the desired electronic water pump.

2. The method according to claim 1, characterized in that, The calculation of the system's minimum flow rate under various temperature conditions includes: When the thermal management circuit is in cooling mode, calculate the first minimum flow rate that meets the cell heat dissipation requirements under the first temperature condition, and; When the thermal management circuit is in heating mode, a second minimum flow rate is calculated to meet the cell heating requirements under a second temperature condition, wherein the first temperature is less than the second temperature.

3. The method according to claim 1, characterized in that, The step of generating system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model includes: Based on the pre-established system flow resistance model, determine the system flow resistance corresponding to the thermal management loop under different flow rates; The curve formed by connecting different system flow resistances is used as the system resistance characteristic curve.

4. The method according to claim 2, characterized in that, The step of determining the target electronic water pump based on the actual operating flow rate of the candidate electronic water pumps under various temperature conditions and the minimum flow rate of the system includes: The first operating flow rate of the candidate electronic water pump under the first temperature condition and the second operating flow rate under the second temperature condition are obtained respectively. The candidate electronic water pump whose first operating flow rate is greater than the first minimum flow rate and whose second operating flow rate is greater than the second minimum flow rate is selected as the target electronic water pump.

5. A vehicle electronic water pump selection device, characterized in that, include: The calculation module is used to calculate the minimum system flow rate under various temperature conditions. The minimum system flow rate is the minimum required flow rate in the thermal management loop to meet the heat dissipation or heating requirements of the battery cells. The generation module is used to generate system resistance characteristic curves corresponding to various temperature conditions based on a pre-established system flow resistance model; the system resistance characteristic curve is the relationship curve between the flow rate of the heat exchange medium in the heat loop system and the system flow resistance. The determination module is used to determine the target electronic water pump based on the minimum flow rate of the system and the system flow resistance in the system resistance characteristic curve; The determining module is used for: Obtain the QH curves of multiple candidate electronic water pumps; the QH curves are flow rate-head curves. Based on the QH curve of the candidate electronic water pump and the system flow resistance in the system resistance characteristic curve under various temperature conditions, the actual working flow rate of the candidate electronic water pump under various temperature conditions is determined. The target electronic water pump is determined based on the actual operating flow rate of the candidate electronic water pumps under various temperature conditions and the minimum flow rate of the system. The determining module is also used for: Obtain the Q-η curves of multiple target electronic water pumps; the Q-η curves are flow rate-efficiency curves. Based on the Q-η curve of the target electronic water pump, the first operating efficiency of the target electronic water pump at the first operating flow rate and the second operating efficiency of the target electronic water pump at the second operating flow rate are determined. The baseline operating efficiency of the target electronic water pump is calculated based on the maximum operating efficiency in the Q-η curve of the target electronic water pump. The target electronic water pump whose first and second operating efficiencies are greater than the benchmark operating efficiency is selected as the required electronic water pump; The determining module is also used for: Obtain the QP curves of multiple target electronic water pumps; the QP curves are flow-power curves. Based on the QP curve of the target electronic water pump, determine the first power of the target electronic water pump at the first operating flow rate and the second power of the target electronic water pump at the second operating flow rate. The target electronic water pump whose first power and second power are less than a preset power threshold is selected as the desired electronic water pump.

6. An electronic device, characterized in that, include: A processor and a memory, the memory being used to store a computer program, the processor being used to invoke and run the computer program stored in the memory to perform the method of any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as described in any one of claims 1-4.

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