Method and apparatus for determining rotational speed of water pump in fuel cell thermal management system, and device

Abstract

The present application provides a method and apparatus for determining the rotational speed of a water pump in a fuel cell thermal management system, and a device. The method of the present application is applied to a fuel cell thermal management system (comprising a plurality of different subsystems, wherein the subsystems are provided with corresponding pipes and are in communication with each other by means of the pipes). The method comprises: determining, from among a plurality of different subsystems, a plurality of target subsystems comprising a water pump, wherein pipes respectively corresponding to the plurality of target subsystems form a circulation loop; determining pressure drop values of the target subsystems other than the water pump, an assumed rotational speed value of the water pump (any value within a preset rotational speed range), and a total flow rate value of a coolant in the circulation loop; determining a pressure rise value of the water pump on the basis of the assumed rotational speed value; and if the difference between the sum of the pressure drop values and the pressure rise value is within a first preset range, determining that the assumed rotational speed value is a rotational speed value required by the water pump under the total flow rate value. The method can solve the problem of high calibration costs caused by the need for a large amount of materials, devices and human resources during manual calibration.

Description

Method, device and equipment for determining rotation speed of water pump in fuel cell thermal management system Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202410844958.2, filed on June 27, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of fuel cells, and in particular to a method, device and equipment for determining rotation speed of water pump in fuel cell thermal management system. BACKGROUND

[0003] Fuel cell thermal management system is an important component in fuel cell system, and its core task is to control the working temperature of fuel cell system within a safe and reasonable range. During the working process of fuel cell system, fuel cell thermal management system controls the flow of circulating coolant through each heat source component to achieve precise temperature control.

[0004] In the traditional technology, the adjustment of the rotation speed of the water pump in the fuel cell thermal management system depends on the calibration data after the system is assembled, that is, the temperature difference of the coolant at the inlet and outlet of the fuel cell stack is used to adjust the rotation speed of the water pump, and when the temperature difference is small, the rotation speed of the water pump is reduced, and when the temperature difference is large, the rotation speed of the water pump is increased. However, this method requires a large amount of resources, equipment and human resources, and the calibration cost is high. SUMMARY

[0005] The present application provides a method, device and equipment for determining the rotation speed of the water pump in the fuel cell thermal management system, which can significantly reduce the dependence on artificial calibration data for water pump rotation speed adjustment, and solve the problem of high calibration cost caused by the need to invest a large amount of resources, equipment and human resources during artificial calibration.

[0006] In a first aspect, the present application provides a method for determining the rotation speed of a water pump in a fuel cell thermal management system, applied to a fuel cell thermal management system, the fuel cell thermal management system comprising a plurality of different subsystems, each of the subsystems being provided with a corresponding pipeline, each of the subsystems being connected through the pipeline, the pipeline being used for flowing coolant to cool at least one of the subsystems, and the plurality of different subsystems comprising a water pump; the method comprising:

[0007] Among the plurality of different subsystems, a plurality of target subsystems containing the water pump are determined, and the corresponding pipelines of the plurality of target subsystems form a flow circulation loop;

[0008] determining a pressure drop value of each of the target subsystems except the water pump, a supposed rotating speed value of the water pump, and a total flow value of the coolant in the flow circulation loop, the supposed rotating speed value being any value in a preset rotating speed range;

[0009] determining a pressure rise value of the water pump according to the supposed rotating speed value and the total flow value;

[0010] if a difference between a sum of the pressure drop values and the pressure rise value is within a first preset range, determining that the supposed rotating speed value is a required rotating speed value of the water pump under the total flow value.

[0011] Optionally, the determining of the pressure drop value of each of the target subsystems except the water pump comprises:

[0012] determining a flow value of the coolant in a pipeline corresponding to each of the target subsystems;

[0013] determining the pressure drop value of each of the target subsystems except the water pump according to each of the flow values.

[0014] Optionally, the determining of the pressure drop value of each of the target subsystems except the water pump according to each of the flow values comprises:

[0015] adopting an equation ΔP = dQ 2 + eQ + f to determine the pressure drop value of each of the target subsystems, wherein ΔP is the pressure drop value of the target subsystem, Q is the flow value of the coolant flowing through the target subsystem, and d, e, and f are control coefficients of the target subsystem under the corresponding flow value. Optionally, the determining of the pressure rise value of the water pump according to the supposed rotating speed value and the total flow value comprises:

[0016] adopting an equation ΔP pump = aQ t 2 + bQ t + c to determine the pressure rise value of the water pump, wherein ΔP pump is the pressure rise value of the water pump, Q t is the total flow value, and a, b, and c are control coefficients corresponding to the supposed rotating speed value.

[0017] Optionally, in the plurality of different subsystems, the plurality of target subsystems containing the water pump are determined by:

[0018] determining a connection type between the plurality of subsystems, the connection type comprising series connection and parallel connection;

[0019] determining at least one flow circulation loop according to the connection type and a pipeline corresponding to each of the subsystems, each of the flow circulation loops comprising a pipeline corresponding to the water pump.

[0020] determining a plurality of target subsystems containing the water pump according to the at least one flow circuit.

[0021] Optionally, the determining a plurality of target subsystems containing the water pump according to the at least one flow circuit comprises:

[0022] determining a first flow circuit from any one of the at least one flow circuit;

[0023] determining each subsystem through which cooling liquid flows in the first flow circuit as the plurality of target subsystems.

[0024] Optionally, the determining a plurality of target subsystems containing the water pump according to the at least one flow circuit comprises:

[0025] determining a second flow circuit from the at least one flow circuit, a number of subsystems through which cooling liquid flows in the second flow circuit being a minimum of numbers of subsystems through which cooling liquid flows in each of the flow circuits;

[0026] determining each subsystem through which cooling liquid flows in the second flow circuit as the plurality of target subsystems.

[0027] Optionally, the determining a flow value of cooling liquid in a pipeline corresponding to each of the target subsystems comprises:

[0028] determining the flow value of cooling liquid in the pipeline corresponding to each of the plurality of different subsystems by a preset algorithm;

[0029] determining the flow value of cooling liquid in the pipeline corresponding to each of the target subsystems according to the flow value of cooling liquid in the pipeline corresponding to each of the subsystems.

[0030] Optionally, the plurality of different subsystems comprises a first subsystem, and the determining the flow value of cooling liquid in the pipeline corresponding to each of the plurality of different subsystems by the preset algorithm comprises:

[0031] determining a second subsystem parallel to the first subsystem from the plurality of different subsystems;

[0032] determining a hypothetical flow value of cooling liquid in the pipeline corresponding to the first subsystem, a flow sum value of cooling liquid in the pipeline corresponding to the first subsystem and the pipeline corresponding to the second subsystem, the hypothetical flow value being any value in a preset flow range;

[0033] determining a first resistance value corresponding to the first subsystem and a second resistance value corresponding to the second subsystem according to the hypothetical flow value;

[0034] determining a flow value of the cooling liquid in the pipeline corresponding to the first subsystem according to the flow sum value, the first resistance value and the second resistance value.

[0035] Optionally, the determining the first resistance value of the first subsystem according to the assumed flow value comprises:

[0036] obtaining a pressure drop of the first subsystem, a parameter of the pipeline corresponding to the first subsystem and a density of the cooling liquid;

[0037] determining the first resistance value according to the assumed flow value, the pressure drop of the first subsystem, the parameter of the pipeline and the density of the cooling liquid.

[0038] Optionally, the determining the first resistance value according to the assumed flow value, the pressure drop of the first subsystem, the parameter of the pipeline and the density of the cooling liquid comprises:

[0039] determining a system resistance value of the first subsystem according to the assumed flow value and the pressure drop of the first subsystem;

[0040] determining a pipeline resistance value of the pipeline corresponding to the first subsystem according to the parameter of the pipeline and the density of the cooling liquid;

[0041] determining a sum value of the system resistance value and the pipeline resistance value as the first resistance value.

[0042] Optionally, the determining the flow value of the cooling liquid in the pipeline corresponding to the first subsystem according to the flow sum value, the first resistance value and the second resistance value comprises:

[0043] determining a flow calculation value of the cooling liquid in the pipeline corresponding to the first subsystem through an equation , wherein, represents the flow calculation value, represents the flow sum value, R1 represents the first resistance value and R2 represents the second resistance value.

[0044] if a difference between the flow calculation value and the assumed flow value is within a second preset range, determining the assumed flow value as the flow value of the cooling liquid in the pipeline corresponding to the first subsystem.

[0045] Optionally, the plurality of different subsystems include a first type of subsystem, a second type of subsystem, a water pump, and a particle filter, the first type of subsystem includes a intercooler and a fuel cell stack in parallel, the second type of subsystem includes a radiator, a heater, a deionizer, and a temperature control valve, the radiator, the heater, and the deionizer are in parallel with each other, the temperature control valve is arranged at a joint of outlets of the respective pipelines of the radiator and the heater, the coolant flows through the particle filter, the first type of subsystem, the second type of subsystem, and back to the water pump in sequence under the driving of the water pump.

[0046] In a second aspect, the present application provides a device for determining a rotation speed of a water pump in a fuel cell thermal management system, the fuel cell thermal management system including a plurality of different subsystems, each of the subsystems being provided with a corresponding pipeline, each of the subsystems being connected through the pipeline, the pipeline being used for flowing coolant to cool at least one of the subsystems, the plurality of different subsystems including the water pump; the device including:

[0047] a first determining module configured to determine a plurality of target subsystems including the water pump from the plurality of different subsystems, the corresponding pipelines of the plurality of target subsystems forming a flow circulation loop;

[0048] a second determining module configured to determine a pressure drop value of each of the target subsystems except the water pump, an assumed rotation speed value of the water pump, and a total flow value of the coolant in the flow circulation loop, the assumed rotation speed value being any value in a preset rotation speed range;

[0049] a third determining module configured to determine a pressure rise value of the water pump according to the assumed rotation speed value and the total flow value;

[0050] a fourth determining module configured to determine that the assumed rotation speed value is a required rotation speed value of the water pump under the total flow value if a difference between a sum of the pressure drop values and the pressure rise value is within a first preset range.

[0051] Optionally, the second determining module includes:

[0052] a first determining submodule configured to determine a flow value of the coolant in the corresponding pipeline of each of the target subsystems;

[0053] a second determining submodule configured to determine a pressure drop value of each of the target subsystems except the water pump according to each of the flow values.

[0054] Optionally, the second determining submodule includes:

[0055] a third determining submodule configured to determine the pressure drop value of each of the target subsystems except the water pump by using an equation ΔP=dQ2 +eQ+f determines the pressure drop value of each of the target subsystems, wherein ΔP is the pressure drop value of the target subsystem, Q is the flow value of the coolant flowing through the target subsystem, and d, e, and f are control coefficients of the target subsystem at the corresponding flow value. Optionally, the third determining module comprises:

[0056] using the formula ΔP pump =aQ t 2 +bQ t +c determines the pressure rise value of the water pump, wherein ΔP pump is the pressure rise value of the water pump, Q t is the total flow value, and a, b, and c are control coefficients corresponding to the assumed rotation speed value.

[0057] Optionally, the first determining module comprises:

[0058] a fourth determining submodule for determining the connection type between the plurality of subsystems, wherein the connection type comprises series connection and parallel connection;

[0059] a fifth determining submodule for determining at least one flow circuit according to the connection type and the pipeline corresponding to each of the subsystems, wherein each of the flow circuits comprises the pipeline corresponding to the water pump;

[0060] a sixth determining submodule for determining a plurality of target subsystems containing the water pump according to the at least one flow circuit.

[0061] Optionally, the sixth determining submodule comprises:

[0062] a seventh determining submodule for determining that any one of the at least one flow circuit is a first flow circuit;

[0063] an eighth determining submodule for determining each of the subsystems through which the coolant flows in the first flow circuit as the plurality of target subsystems.

[0064] Optionally, the sixth determining submodule comprises:

[0065] a ninth determining submodule for determining a second flow circuit in the at least one flow circuit, wherein the number of the subsystems through which the coolant flows in the second flow circuit is the minimum value in the number of the subsystems through which the coolant flows in each of the flow circuits;

[0066] a tenth determining submodule for determining each of the subsystems through which the coolant flows in the second flow circuit as the plurality of target subsystems.

[0067] Optionally, the first determining module comprises:

[0068] a eleventh determining sub-module, configured to determine a flow value of the cooling liquid in the pipeline corresponding to each of the plurality of different subsystems by a preset algorithm;

[0069] a twelfth determining sub-module, configured to determine a flow value of the cooling liquid in the pipeline corresponding to each of the target subsystems according to the flow value of the cooling liquid in the pipeline corresponding to each of the subsystems.

[0070] Optionally, the plurality of different subsystems comprises a first subsystem, and the eleventh determining sub-module comprises:

[0071] a thirteenth determining sub-module, configured to determine a second subsystem in parallel with the first subsystem among the plurality of different subsystems;

[0072] a fourteenth determining sub-module, configured to determine a hypothetical flow value of the cooling liquid in the pipeline corresponding to the first subsystem, and a flow sum value of the cooling liquid in the pipeline corresponding to the first subsystem and the pipeline corresponding to the second subsystem, the hypothetical flow value being within a preset flow range;

[0073] a fifteenth determining sub-module, configured to determine a first resistance value corresponding to the first subsystem and a second resistance value corresponding to the second subsystem according to the hypothetical flow value;

[0074] a sixteenth determining sub-module, configured to determine a flow value of the cooling liquid in the pipeline corresponding to the first subsystem according to the flow sum value, the first resistance value and the second resistance value.

[0075] Optionally, the fifteenth determining sub-module comprises:

[0076] an obtaining sub-module, configured to obtain a pressure drop of the first subsystem, a parameter of the pipeline corresponding to the first subsystem and a density of the cooling liquid;

[0077] a seventeenth determining sub-module, configured to determine the first resistance value according to the hypothetical flow value, the pressure drop of the first subsystem, the parameter of the pipeline and the density of the cooling liquid.

[0078] Optionally, the seventeenth determining sub-module comprises:

[0079] an eighteenth determining sub-module, configured to determine a system resistance value of the first subsystem according to the hypothetical flow value and the pressure drop of the first subsystem;

[0080] a nineteenth determining sub-module, configured to determine a pipeline resistance value of the pipeline corresponding to the first subsystem according to the parameter of the pipeline and the density of the cooling liquid;

[0081] The twentieth determining sub-module is configured to determine a sum of the system resistance value and the pipeline resistance value as the first resistance value.

[0082] Optionally, the sixteenth determining sub-module comprises:

[0083] The twenty-first determining sub-module is configured to determine a flow calculation value of the cooling liquid in the pipeline corresponding to the first subsystem by an algorithm , wherein, represents the flow calculation value, represents the flow sum value, R1 represents the first resistance value, and R2 represents the second resistance value.

[0084] The twenty-second determining sub-module is configured to determine the flow assumption value as the flow value of the cooling liquid in the pipeline corresponding to the first subsystem if a difference between the flow calculation value and the flow assumption value is within a second preset range.

[0085] Optionally, the plurality of different subsystems comprise a first type of subsystem, a second type of subsystem, a water pump, and a particle filter, the first type of subsystem comprises a parallelly connected intercooler and fuel cell stack, the second type of subsystem comprises a radiator, a heater, a deionizer, and a temperature control valve, the radiator, the heater, and the deionizer are parallelly connected to each other, the temperature control valve is arranged at a joint of outlets of the radiator and the heater respectively corresponding pipelines, and the cooling liquid flows through the particle filter, the first type of subsystem, and the second type of subsystem in sequence under the driving of the water pump and then flows back to the water pump.

[0086] In a third aspect, the present application provides an electronic device, comprising:

[0087] a processor;

[0088] a memory for storing processor-executable instructions;

[0089] The processor is configured to execute to implement the method for determining the rotation speed of the water pump in the fuel cell thermal management system according to the first aspect of the present application.

[0090] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of an electronic device, the electronic device can execute a method for determining the rotation speed of the water pump in the fuel cell thermal management system according to the first aspect of the present application.

[0091] The method for determining the rotation speed of the water pump in the fuel cell thermal management system provided in the present application first determines a plurality of target subsystems containing the water pump in a plurality of different subsystems (the pipelines corresponding to each of the plurality of target subsystems form a flow loop), then determines the pressure drop values of each of the target subsystems except the water pump, the assumed rotation speed value of the water pump, and the total flow value of the coolant in the flow loop, determines the pressure rise value of the water pump according to the assumed rotation speed value and the total flow value, and if the difference between the sum of each pressure drop value and the pressure rise value is within a first preset range, the assumed rotation speed value is determined as the rotation speed value matched with the total flow value. The method provided in the present application can calculate the rotation speed of the water pump required at different flow values. The method can be applied to the water pump rotation speed adjustment calibration process after the fuel cell thermal management system is assembled, avoids the phenomenon that the error is large and the time is long when the human calibration is performed, and improves the calibration efficiency and accuracy. The method can be applied to the determination of the water pump rotation speed when the fuel cell thermal management system is actually working, or as a backup scheme of the original adjustment scheme, to ensure the normal and stable working of the water pump. Whether the method is applied to the first aspect or the second aspect, the dependence on the manual calibration data for the water pump rotation speed adjustment in the related art can be significantly reduced, and the problem of high calibration cost caused by the need to invest a large amount of resources such as materials, equipment and human resources during manual calibration can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0092] In order to more clearly illustrate the technical solutions in the technical solutions of the present application, the drawings needed in the description of the technical solutions will be briefly introduced below. Obviously, the drawings in the following description are some technical solutions of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0093] FIG. 1 is a schematic diagram of the architecture of a fuel cell thermal management system according to an embodiment of the present application;

[0094] FIG. 2 is a flowchart of a method for determining the rotation speed of a water pump in a fuel cell thermal management system according to an embodiment of the present application;

[0095] FIG. 3 is an execution flowchart of a method for determining the rotation speed of a water pump in a fuel cell thermal management system according to an embodiment of the present application;

[0096] FIG. 4 is a schematic diagram of a calculation result of the rotation speed of a water pump according to an embodiment of the present application;

[0097] FIG. 5 is a structural block diagram of a device for determining the rotation speed of a water pump in a fuel cell thermal management system according to an embodiment of the present application;

[0098] FIG. 6 is a structural diagram of an electronic device according to an embodiment of the present application;

[0099] Reference signs:

[0100] 1 - radiator, 2 - PTC, 3 - deionizer, 4 - intercooler, 5 - fuel cell stack, 6 - particulate filter, 7 - water pump, 8 - temperature control valve. DETAILED DESCRIPTION

[0101] In order to make the above objectives, characteristics and advantages of the present application more apparent, more comprehensible, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described technical solutions are part of the technical solutions of the present application, but not all. Based on the technical solutions in the present application, all other technical solutions obtained by those of ordinary skill in the art without any creative labor shall fall within the scope of protection of the present application.

[0102] The method of the present application is used to determine the rotating speed of a water pump in a fuel cell thermal management system. The fuel cell thermal management system comprises a plurality of different subsystems, each of which is provided with a corresponding pipeline, and the subsystems are connected through the pipelines, and the pipelines are used to flow cooling liquid to cool at least one of the subsystems.

[0103] The fuel cell thermal management system of the present application will be described below.

[0104] In one embodiment, the architecture can be as shown in FIG. 1. FIG. 1 is a schematic diagram of the architecture of a fuel cell thermal management system according to one technical solution of the present application. In combination with FIG. 1, the fuel cell thermal management system of the present application comprises a radiator 1, a PTC 2, a deionizer 3, an intercooler 4, a fuel cell stack 5, a particulate filter 6, a water pump 7 and a temperature control valve 8. The PTC 2 (Positive-Temperature-Coefficient) is a direct current PTC heater on an electric vehicle, and is also a typical semiconductor resistor with temperature sensitivity. The radiator 1 is used to absorb heat in the circulating cooling liquid flowing therethrough. The deionizer 3 is used to adsorb charged ions in the cooling liquid to the inside of the deionization device, and through the action of special proportion modified resin particles, the conductivity ion concentration in the cooling liquid is greatly reduced to within the standard range, to ensure the safe and stable operation of the fuel cell power system. The intercooler 4 is used to reduce the intake air temperature of the fuel cell stack.

[0105] The fuel cell thermal management system is a component of the fuel cell system. During the operation of the fuel cell system, the fuel cell thermal management system controls the flow of the circulating coolant through each heat source component to achieve precise temperature control. The specific control process includes: the circulating coolant is powered by the water pump 7, first flows through the particulate filter 6 to remove impurities in the coolant, then the circulating coolant flows into the fuel cell stack 5 and the intercooler 4 respectively, after absorbing the heat generated therein, the circulating coolant flows through the deionizer 3, the PTC 2 or the radiator 1 respectively, and finally the circulating coolant flows into the water pump 7 to complete the water circulation. In the above process, the total flow of the circulating coolant needs to be calculated according to the heat dissipation of the fuel cell stack 5 under different power requirements, and the speed of the water pump 7 is adjusted according to the total flow to meet the heat dissipation requirement.

[0106] Among them, the subsystem can be any one of the radiator 1, the PTC 2, the deionizer 3, the intercooler 4, the fuel cell stack 5, the particulate filter 6, the water pump 7 and the temperature control valve 8 in FIG. 1. Each subsystem has a corresponding pipeline for circulating coolant. For example, the pipeline corresponding to the fuel cell stack 5 is wrapped around the fuel cell stack 5, and the coolant flowing in the pipeline can cool the fuel cell stack 5.

[0107] The method for determining the speed of the water pump in the present application can be applied to various fuel cell thermal management systems (i.e. including but not limited to the fuel cell thermal management system shown in FIG. 1). In order to facilitate the presentation of the method of the present application, each subsequent technical solution is described with reference to the structure shown in FIG. 1.

[0108] The execution device of the method of the present application is a speed prediction device, which can be any type of server or terminal device outside the vehicle (at this time it can be used to predict the speed of the water pump of the fuel cell thermal management system corresponding to different flows in advance, and the prediction process can also be used for calibration process), or a controller located inside the vehicle (calculating the speed of the water pump corresponding to different flows when the fuel cell thermal management system of the vehicle is working normally).

[0109] FIG. 2 is a flowchart of a method for determining the speed of the water pump in the fuel cell thermal management system according to one technical solution of the present application. In combination with FIG. 2, the method of the present application can include:

[0110] Step S21: In a plurality of different subsystems, a plurality of target subsystems containing a water pump are determined, and the corresponding pipelines of the plurality of target subsystems form a flow circulation loop.

[0111] In the present application, the coolant is powered by the water pump 7, passes through the flow circuit, and finally flows back to the water pump 7. The coolant flows through each target subsystem in the flow circuit, so the flow circuit is a complete circuit for the coolant to flow through each target subsystem.

[0112] For example, in FIG. 1, the pipes corresponding to the water pump 7, the particulate filter 6, the fuel cell stack 5, and the deionizer 3 each form a complete flow circuit. When the coolant flows in the flow circuit, it flows from the water pump 7, passes through the particulate filter 6, the fuel cell stack 5, and the deionizer 3 in turn, and finally flows back to the water pump 7. At this time, the multiple target subsystems are the water pump 7, the particulate filter 6, the fuel cell stack 5, and the deionizer 3.

[0113] Step S22: Determine the pressure drop value of each target subsystem except the water pump, the assumed rotational speed value of the water pump, and the total flow value of the coolant in the flow circuit. The assumed rotational speed value is any value within the preset rotational speed range.

[0114] In step S22, the rotational speed prediction device can determine the assumed rotational speed value of the water pump within the preset rotational speed range. The preset rotational speed range can be the rotational speed range in which the water pump normally operates, and the values can be taken one by one or according to a set step size. The specific setting can be determined according to actual needs.

[0115] The total flow value (hereinafter referred to as Q t ) can be determined according to the heat dissipation required by the fuel cell stack 5. The present technical solution does not limit the way of determining the heat dissipation. The total flow value Q t of the coolant in the flow circuit is the total value of the flow of the coolant flowing through the water pump 7.

[0116] Specifically, determining the pressure drop value of each target subsystem except the water pump can include:

[0117] Determining the flow value of the coolant in the pipe corresponding to each target subsystem;

[0118] According to each flow value, determining the pressure drop value of each target subsystem except the water pump.

[0119] The present application can determine the corresponding pressure drop value of each target subsystem according to the flow value of each target subsystem in any way in the prior art.

[0120] Step S23: Determine the pressure rise value of the water pump according to the assumed rotational speed value and the total flow value.

[0121] In the present technical solution, the pressure rise value of the water pump can be determined according to the assumed rotational speed value (hereinafter referred to as n) and the total flow value Q tThe pressure rise value of the water pump 7 is determined, and the pressure drop values of the target subsystems are determined according to the flow values of the target subsystems. The pressure drop value of a subsystem refers to the pressure difference between the inlet and outlet of the pipeline corresponding to the subsystem when the coolant flows through the subsystem.

[0122] Step S24: If the difference between the sum of the pressure drop values and the pressure rise value is within the first preset range, the assumed rotation speed value is determined as the rotation speed value required by the water pump at the total flow value.

[0123] According to the above technical solution, step S24 is performed, and the sum ΔP t = ΔP 颗粒过滤器 + ΔP 中冷器 + ΔP 去离子器 If the difference between ΔP pump and the sum ΔP t of the pressure drop values is within the first preset range, it indicates that the assumed rotation speed value n can be approximately equal to the rotation speed value required by the water pump 7 at Q 水泵 . The first preset range can be set according to actual needs, for example, it can be [-0.01 kPa, +0.01 kPa].

[0124] The method of performing steps S21-S24 can quickly and accurately calculate the rotation speed value required by the water pump at different flow values. The method can be applied to the water pump rotation speed adjustment calibration process after the fuel cell thermal management system is assembled, avoiding the phenomenon of large errors and long time in manual calibration, improving the calibration efficiency and accuracy. The method can be applied to the determination of the water pump rotation speed during the actual work of the fuel cell thermal management system, or as a backup scheme for the original adjustment scheme, to ensure the normal and stable work of the water pump. Whether the method is applied to the first aspect or the second aspect, it can significantly reduce the dependence on manual calibration data for water pump rotation speed adjustment in related technologies, and solve the problem of high calibration cost caused by the need to invest a large amount of materials, equipment, and human resources during manual calibration. In addition, the method can also be applied to the structural design of the fuel cell thermal management system. Through the method, a large amount of data can be collected for a certain structure of the fuel cell thermal management system, which is helpful for the performance analysis of the fuel cell thermal management system and provides technical support for improving the fuel cell thermal management system.

[0125] In this application, the concept of a subsystem is equivalent to the concept of a component in a fuel cell thermal management system. In other words, radiator 1, PTC 2, deionizer 3, intercooler 4, fuel cell stack 5, particulate filter 6, water pump 7, and temperature control valve 8 are all different components in the fuel cell thermal management system. The pipelines containing each component are called loops. For example, the pipeline containing intercooler 4 is called the intercooler loop, and the pipeline containing fuel cell stack 5 is called the fuel cell stack loop. Therefore, the pipelines corresponding to multiple target subsystems constitute a flow loop, which actually means that the loops representing the components of each target subsystem constitute a complete flow loop. For example, when the target subsystems are water pump 7, particulate filter 6, intercooler 4, and deionizer 3, the water pump loop, particulate filter loop, intercooler loop, and deionizer loop constitute a complete flow loop.

[0126] In one embodiment, combining the above technical solutions, determining the pressure rise of the water pump based on the assumed rotational speed and total flow rate may include:

[0127] Using the formula ΔP pump =aQ t 2 +bQ t +c determines the pressure rise value of the water pump, where ΔP pump Q represents the pressure rise of the water pump. t Let be the total flow rate, and a, b, and c be the control coefficients corresponding to the assumed rotational speed values.

[0128] In this technical solution, different rotational speeds correspond to different values ​​of a, b, and c, which can be determined by consulting the water pump performance map, which is pre-calibrated.

[0129] Similarly, based on the various flow rates, the pressure drop values ​​for each target subsystem, excluding the water pump, are determined, including:

[0130] The formula ΔP=dQ is used. 2 The pressure drop values ​​of each target subsystem are determined by +eQ+f, where ΔP is the pressure drop value of the target subsystem, Q is the flow rate of the coolant flowing through the target subsystem, and d, e, and f are the control coefficients of the target subsystem at the corresponding flow rate Q. Different target subsystems have different combinations of d, e, and f.

[0131] Specifically, ΔP 颗粒过滤器 =d1 Q 颗粒过滤器 2 + e1Q 颗粒过滤器 +f1, ΔP 中冷器 = d2 Q 中冷器 2 + e2 Q 中冷器 +f2, ΔP 去离子器 =d3Q去离子器 2 +e3Q 去离子器 +f3. d1, e1, and f1 represent the particulate filter at flow rate Q. 颗粒过滤器 The following set of control coefficients, d2, e2, and f2, represent the intercooler's flow rate Q. 中冷器 The following set of control coefficients, d3, e3, and f3, represent the deionizer's flow rate Q. 去离子器 The next set of control coefficients.

[0132] In one embodiment, combining the above technical solutions, step S21, in which multiple target subsystems including water pumps are identified among multiple different subsystems, may include:

[0133] Step S211: Determine the connection type between multiple subsystems, including series and parallel connections;

[0134] Step S212: Based on the connection type and the pipelines corresponding to each subsystem, determine at least one flow loop, and each flow loop includes the pipeline corresponding to the water pump;

[0135] Step S213: Determine multiple target subsystems including water pumps based on at least one flow loop.

[0136] Taking the structure shown in Figure 1 as an example, all complete flow loops containing the pipes corresponding to the water pump 7 can be determined. The number of these loops can be one or more.

[0137] Specifically, all the flow loops identified in Figure 1 are shown as flow loops 1 through 6:

[0138] Flow circuit 1: Combination of the corresponding pipelines for water pump 7, particulate filter 6, intercooler 4, and deionizer 3;

[0139] Flow circuit 2: Combination of the corresponding pipelines for water pump 7, particulate filter 6, intercooler 4, PTC 2, and temperature control valve 8;

[0140] Flow circuit 3: Combination of the corresponding pipelines for water pump 7, particulate filter 6, intercooler 4, radiator 1, and thermostatic valve 8;

[0141] Flow loop 4: Combination of the corresponding pipelines for water pump 7, particulate filter 6, fuel cell stack 5, and deionizer 3;

[0142] Circulation loop 5: Combination of the corresponding pipelines for water pump 7, particulate filter 6, fuel cell stack 5, PTC2, and temperature control valve 8;

[0143] Flow circuit 6: Combination of the corresponding pipelines for water pump 7, particulate filter 6, fuel cell stack 5, radiator 1, and temperature control valve 8.

[0144] Then, the multiple target subsystems can be obtained by any one of the following two methods.

[0145] Method one:

[0146] determining any one of the at least one flow loop as a first flow loop;

[0147] determining each subsystem through which the coolant in the first flow loop flows as the multiple target subsystems.

[0148] In the method one, any one of the flow loops 1-6 can be selected as the first flow loop, and each subsystem through which the coolant in the first flow loop flows can be determined as the target subsystems.

[0149] If the flow loop 1 is the first flow loop, the multiple target subsystems determined are the water pump 7, the particulate filter 6, the intercooler 4, and the deionizer 3. If the flow loop 2 is the first flow loop, the multiple target subsystems determined are the water pump 7, the particulate filter 6, the intercooler 4, the PTC 2, and the temperature control valve 8.

[0150] Method two:

[0151] determining a second flow loop in the at least one flow loop, the number of the subsystems through which the coolant in the second flow loop flows being the minimum of the numbers of the subsystems through which the coolant in each flow loop flows;

[0152] determining each subsystem through which the coolant in the second flow loop flows as the multiple target subsystems, including:

[0153] if the number of the second flow loops is one, determining each subsystem through which the coolant in the second flow loop flows as the multiple target subsystems;

[0154] if the number of the second flow loops is multiple, determining each subsystem through which the coolant in any one of the second flow loops flows as the multiple target subsystems.

[0155] In the method two, the flow loop through which the coolant flows with the least number of subsystems, i.e., the flow loop 1 or the flow loop 4, can be determined first. Then, according to the flow loop 1, the multiple target subsystems determined are the water pump 7, the particulate filter 6, the intercooler 4, and the deionizer 3. Alternatively, according to the flow loop 4, the multiple target subsystems determined are the water pump 7, the particulate filter 6, the fuel cell stack 5, and the deionizer 3.

[0156] The fuel cell thermal management system of the present application comprises all the subsystems, which are divided into: the first type of subsystem, the second type of subsystem, the water pump 7 and the particle filter 6. The first type of subsystem, the second type of subsystem, the water pump 7 and the particle filter 6 are connected in series. The coolant flows through the particle filter 6, the first type of subsystem, the second type of subsystem in turn under the driving of the water pump 7 and flows back to the water pump 7.

[0157] In an embodiment, the first type of subsystem comprises the intercooler 4 and the fuel cell stack 5 in parallel, as shown in Figure 1. Of course, in actual implementation, the first type of subsystem in different fuel cell thermal management systems can be different, but it can still use the method of the present application.

[0158] In an embodiment, the second type of subsystem comprises the radiator 1, the heater 2 (i.e. PTC 2), the deionizer 3 and the temperature control valve 8, the radiator 1, the heater 2 and the deionizer 3 are connected in parallel with each other, and the temperature control valve 8 is arranged at the outlet convergence of the respective pipelines of the radiator 1 and the heater 2. Of course, in actual implementation, the second type of subsystem in different fuel cell thermal management systems can be different, but it can still use the method of the present application.

[0159] Since the intercooler 4 and the fuel cell stack 5 in the first type of subsystem are in parallel, the pressure drops of the two are the same, and when obtaining the flow circulation loop of the pipeline containing the water pump 7, only one of the intercooler 4 and the fuel cell stack 5 needs to be selected arbitrarily. Similarly, the radiator 1, the heater 2 and the deionizer 3 are connected in parallel with each other, and when obtaining the flow circulation loop of the pipeline containing the water pump 7, only one of the radiator 1, the heater 2 and the deionizer 3 needs to be selected arbitrarily. In other words, for the loop of the first type of subsystem, the second type of subsystem, the water pump 7 and the particle filter 6. If the structures of the first type of subsystem and the second type of subsystem are as shown in Figure 1, the first type of subsystem corresponds to two choices, the second type of subsystem corresponds to three choices, and finally there are six choices of flow circulation loops, as shown in the above flow circulation loop 1-flow circulation loop 6.

[0160] The method for determining the flow circulation loop provided in the technical solution not only enhances the flexibility of the method for determining the rotational speed of the water pump in the fuel cell thermal management system of the present application, but also enhances the application range of the method for determining the rotational speed of the water pump in the fuel cell thermal management system (which can be applied to various fuel cell thermal management systems with different structures), and can better meet various business demands.

[0161] In combination with the above technical solution, in an embodiment, the present application further provides a method for determining the flow value of the coolant flowing through each subsystem. Specifically, determining the flow value of the coolant in the pipeline corresponding to each target subsystem can comprise:

[0162] determine the flow value of the cooling liquid in the pipeline corresponding to each target subsystem according to the flow value of the cooling liquid in the pipeline corresponding to each subsystem.

[0163] determine the flow value of the cooling liquid in the pipeline corresponding to each target subsystem according to the flow value of the cooling liquid in the pipeline corresponding to each subsystem.

[0164] In the technical solution, the flow value of the cooling liquid in the pipeline corresponding to each subsystem can be determined first, and then the flow value of the cooling liquid in the pipeline corresponding to each target subsystem is determined in each subsystem.

[0165] In actual implementation, taking the system shown in FIG. 1 as an example, since the flow value of the cooling liquid flowing through the water pump 7 and the particulate filter 6 is the total flow value Q t Therefore, the preset algorithm is mainly used to determine the flow value of the cooling liquid in the pipeline corresponding to each of the radiator 1, the PTC 2, the deionizer 3, the intercooler 4 and the fuel cell stack 5.

[0166] In combination with the above technical solution, in an implementation manner, the plurality of different subsystems includes a first subsystem, and the determination of the flow value of the cooling liquid in the pipeline corresponding to each subsystem in the plurality of different subsystems by the preset algorithm can include:

[0167] determining a second subsystem in parallel connection with the first subsystem in the plurality of different subsystems;

[0168] determining a hypothetical flow value of the cooling liquid in the pipeline corresponding to the first subsystem, a flow sum value of the cooling liquid in the pipeline corresponding to the first subsystem and the pipeline corresponding to the second subsystem, and the hypothetical flow value being within a preset flow range;

[0169] determining a first resistance value corresponding to the first subsystem and a second resistance value corresponding to the second subsystem according to the hypothetical flow value;

[0170] determining the flow value of the cooling liquid in the pipeline corresponding to the first subsystem according to the flow sum value, the first resistance value and the second resistance value.

[0171] In the technical solution, any two subsystems in parallel connection can be determined in the fuel cell thermal management system as the first subsystem and the second subsystem respectively. For example, taking the system shown in FIG. 1 as an example, the first subsystem is the intercooler 4, and the second subsystem is the fuel cell stack 5; or the first subsystem is the deionizer 3, and the second subsystem is the PTC 2.

[0172] Then, for the first subsystem, a hypothetical flow value (denoted as Q s1(This indicates that the value can be retrieved one by one or according to a set step size, which can be set according to actual needs.)

[0173] If the flow rate and value of the coolant in the pipes corresponding to the first subsystem and the pipes corresponding to the second subsystem are used This indicates that the assumed flow rate of the coolant in the pipeline corresponding to the second subsystem is... .

[0174] Next, based on the assumed flow rate value Q s1 Determine the first resistance value R1 corresponding to the first subsystem and the second resistance value R2 corresponding to the second subsystem. Details will be provided later.

[0175] Finally, based on the flow and value The first resistance value R1 and the second resistance value R2 determine the flow rate of the coolant in the pipeline corresponding to the first subsystem.

[0176] Specifically, based on flow and value Determining the flow rate of coolant in the pipeline corresponding to the first subsystem using the first resistance value R1 and the second resistance value R2 may include the following steps:

[0177] Through formula Determine the calculated flow rate of the coolant in the pipeline corresponding to the first subsystem, where, This represents the calculated flow rate. Represents flow rate and value; R1 represents the first resistance value, and R2 represents the second resistance value.

[0178] If the difference between the calculated flow rate and the assumed flow rate is within the second preset range, the assumed flow rate is determined to be the actual flow rate of the coolant in the pipeline corresponding to the first subsystem.

[0179] In this technical solution, if the calculated flow rate value is... According to the assumed flow rate Q s1 The difference between them is within the second preset range, which can be assumed to be the flow rate value Q. s1 It is approximately equal to the actual flow rate Q of the coolant in the pipeline corresponding to the first subsystem. r-s1 The second preset range can be set according to actual needs, for example, it can be [-10]. -4 +10 -4 ].

[0180] The flow rate Q of the coolant in the pipeline corresponding to the first subsystem is calculated. r-s1 After that, using The actual flow rate Q of the coolant in the pipeline corresponding to the second subsystem can then be calculated. r-s2 .

[0181] In one embodiment, if the first subsystem is the intercooler 4 and the second subsystem is the fuel cell stack 5, the flow rate of the coolant flowing through the intercooler 4 and the fuel cell stack 5 is the total flow rate of the coolant in the entire system Q t , assuming that the assumed flow rate of the coolant flowing through the intercooler 4 is Q 中冷器 , then the first resistance value R 中冷器 corresponding to the intercooler 4 and the second resistance value R 中冷器 corresponding to the fuel cell stack 5 are determined according to Q 燃料电池堆 , and finally, the calculated flow rate Q c-中冷器 is calculated using the following equation:

[0182] If the difference between Q c-中冷器 and the assumed flow rate Q 中冷器 is within the second preset range, the assumed flow rate Q 中冷器 is determined as the actual flow rate of the coolant flowing through the intercooler 4 Q r-中冷器 . The difference between Q t and Q r-中冷器 is the actual flow rate of the coolant flowing through the fuel cell stack 5 Q r-燃料电池堆 .

[0183] In one embodiment, if the first subsystem is the deionizer 3 and the second subsystem is the PTC 2, the flow rate of the coolant flowing through the deionizer 3 and the PTC 2 is the total flow rate of the coolant in the entire system Q t , assuming that the assumed flow rate of the coolant flowing through the deionizer 3 is Q 去离子器 , then the first resistance value R 去离子器 corresponding to the deionizer 3 and the second resistance value R 去离子器 corresponding to the PTC 2 are determined according to Q PTC , and finally, the calculated flow rate Q c-去离子器 is calculated using the following equation:

[0184] If the difference between Q c-去离子器 and the assumed flow rate Q 去离子器 is within the second preset range, the assumed flow rate Q 去离子器 is determined as the actual flow rate of the coolant flowing through the deionizer 3 Q r-去离子器 . The difference between Q t and Q r-去离子器 is the actual flow rate of the coolant flowing through the PTC 2 Q r- PTC .

[0185] Through the technical solution, the flow rate value of the cooling liquid flowing through each of the subsystems in the fuel cell thermal management system can be determined through multiple calculations of each of the subsystems.

[0186] In combination with the above technical solution, in an embodiment, determining the first resistance value corresponding to the first subsystem according to the assumed flow rate value can include:

[0187] obtaining the pressure drop of the first subsystem, parameters of the pipeline corresponding to the first subsystem, and the density of the cooling liquid;

[0188] determining the first resistance value according to the assumed flow rate value, the pressure drop of the first subsystem, the parameters of the pipeline corresponding to the first subsystem, and the density of the cooling liquid.

[0189] In the technical solution, the pressure drop of the first subsystem is represented by , and the density of the cooling liquid is represented by .

[0190] In an embodiment, determining the first resistance value according to the assumed flow rate value, the pressure drop of the first subsystem, the parameters of the pipeline corresponding to the first subsystem, and the density of the cooling liquid can include:

[0191] determining the system resistance value of the first subsystem according to the assumed flow rate value of the first subsystem and the pressure drop of the first subsystem;

[0192] determining the pipeline resistance value of the pipeline corresponding to the first subsystem according to the parameters of the pipeline corresponding to the first subsystem and the density of the cooling liquid;

[0193] determining the first resistance value as the sum of the system resistance value of the first subsystem and the pipeline resistance value of the first subsystem.

[0194] Specifically, determining the system resistance value of the first subsystem can include:

[0195] determining the system resistance value of the first subsystem through the following formula:

[0196]

[0197] wherein, represents the system resistance value of the first subsystem, represents the pressure drop of the first subsystem, represents the assumed flow rate value of the first subsystem.

[0198] In the technical solution, can be obtained from the pressure drop-flow rate relationship curve corresponding to the first subsystem.

[0199] In the technical solution, the parameters of the pipeline corresponding to the first subsystem at least include a friction coefficient, a pipe length, a pipe diameter, and a local resistance coefficient of each elbow in the first subsystem, on the basis of which, the pipeline resistance value of the pipeline corresponding to the first subsystem is determined according to the parameters of the pipeline and the density of the cooling liquid, which can include:

[0200] The pipeline resistance value of the pipeline corresponding to the first subsystem is determined by the following formula:

[0201]

[0202] wherein, represents the pipeline resistance value of the pipeline corresponding to the first subsystem, represents the density of the cooling liquid, represents the friction coefficient of the pipeline corresponding to the first subsystem, represents the pipe length of the pipeline corresponding to the first subsystem, represents the pipe diameter of the pipeline corresponding to the first subsystem, represents the resistance coefficient of each elbow in the first subsystem. The friction coefficient can be determined by the material of the pipeline, and the resistance coefficient of each elbow can be determined by the bending angle of the pipeline.

[0203] After obtaining and , the first resistance value R1 can be obtained by .

[0204] By the technical solution, the system resistance value of the first subsystem and the pipeline resistance value of the first subsystem can be accurately calculated, and thus the accurate first resistance value R1 is obtained, which provides technical support for subsequent calculation of the real flow value through each subsystem.

[0205] In the technical solution, the principle of determining the second resistance value corresponding to the second subsystem is the same as that of determining the first resistance value corresponding to the first subsystem. Specifically, the second resistance value corresponding to the second subsystem can be determined by:

[0206] obtaining the pressure drop of the second subsystem, the parameters of the pipeline corresponding to the second subsystem, and the density of the cooling liquid;

[0207] determining the system resistance value of the second subsystem according to the assumed flow value of the second subsystem and the pressure drop of the second subsystem;

[0208] determining the pipeline resistance value of the second subsystem according to the parameters of the pipeline of the second subsystem and the density of the cooling liquid;

[0209] The sum of the system resistance value of the second subsystem and the pipeline resistance value of the second subsystem is determined as the second resistance value.

[0210] Specifically, determining the system resistance value of the second subsystem can include:

[0211] The system resistance value of the second subsystem is determined by the following formula:

[0212]

[0213] wherein, R2 represents the system resistance value of the second subsystem, ΔP2 represents the pressure drop of the second subsystem, Q2 represents the flow assumption value of the second subsystem, .

[0214] In the technical solution, can be obtained from the pressure drop-flow relationship curve corresponding to the second subsystem.

[0215] In the technical solution, the parameters of the pipeline corresponding to the second subsystem at least include the friction coefficient, the pipe length, the pipe diameter, and the local resistance coefficient of each elbow in the second subsystem, and on this basis, the pipeline resistance value of the pipeline corresponding to the second subsystem is determined according to the parameters of the pipeline and the density of the cooling liquid, which can include:

[0216] The pipeline resistance value of the pipeline corresponding to the second subsystem is determined by the following formula:

[0217]

[0218] wherein, R2 represents the pipeline resistance value of the pipeline corresponding to the second subsystem, ρ represents the density of the cooling liquid, f represents the friction coefficient of the pipeline corresponding to the second subsystem, L represents the pipe length of the pipeline corresponding to the second subsystem, D represents the pipe diameter of the pipeline corresponding to the second subsystem, C represents the resistance coefficient of each elbow in the second subsystem.

[0219] After obtaining and , the second resistance value R2 corresponding to the second subsystem can be obtained by .

[0220] Through the technical solution, the system resistance value R2 of the second subsystem and the pipeline resistance value R2 of the second subsystem , and then the accurate second resistance value R2 is obtained, which provides technical support for subsequent calculation of the real flow value of the cooling liquid flowing through each subsystem.

[0221] In the present application, for a certain subsystem X in the fuel cell thermal management system, the corresponding resistance value is composed of the system resistance value of the system itself and the pipeline resistance value of the corresponding pipeline, the system resistance value is obtained by the formula , in which is the pressure drop of the subsystem X (the calculation method of the pressure drop is as described above), and Q is the assumed flow value of the cooling liquid flowing through the subsystem X. The pipeline resistance value is obtained by the formula , in which represents the density of the cooling liquid, represents the friction coefficient of the pipeline, represents the pipe length of the pipeline, represents the pipe diameter of the pipeline, represents the local resistance coefficient of each bend in the subsystem X. Therefore, for any two parallel subsystems in the fuel cell thermal management system, the flow value of the cooling liquid flowing through the two subsystems can be calculated by the above formula.

[0222] By the above method of calculating the flow value, the flow value of the cooling liquid in the pipeline corresponding to any one of the radiator 1, the PTC 2, the deionizer 3, the intercooler 4, and the fuel cell stack 5 in the fuel cell thermal management system can be calculated. Taking FIG. 1 as an example, for example, the fuel cell stack 5 can be taken as a first subsystem, and the intercooler 4 can be taken as a second subsystem, and the flow value of the cooling liquid in the fuel cell stack 5 and the intercooler 4 can be calculated. Then, the radiator 1 and the PTC 2 can be equivalent to a first subsystem, and the deionizer 3 can be taken as a second subsystem, and the flow value of the cooling liquid in the pipeline corresponding to the deionizer 3 and the flow sum of the radiator 1 and the PTC 2 can be calculated. Finally, the radiator 1 can be taken as a first subsystem, and the PTC 2 can be taken as a second subsystem, and the flow value of the cooling liquid in the pipeline corresponding to the radiator 1 and the flow value of the cooling liquid in the pipeline corresponding to the PTC 2 can be calculated. Therefore, by the method of the present application, the flow value of the cooling liquid flowing through any one of the subsystems in the fuel cell thermal management system can be calculated.

[0223] FIG. 3 is an execution flow diagram of a method for determining the rotation speed of a water pump in a fuel cell thermal management system according to an embodiment of the present application. Taking the water pump 7, the particulate filter 6, the fuel cell stack 5, and the deionizer 3 as the target subsystems, the complete implementation process of the method for determining the rotation speed of the water pump according to the present application is as follows in combination with FIG. 3: [0223.1] Step 1: Input the parameters of the pipeline corresponding to the fuel cell stack 5 and the pressure drop-flow rate curve, and the parameters of the pipeline corresponding to the deionizer 3 and the pressure drop-flow rate curve. [0223.2] Step 2: Determine the assumed rotational speed n of the water pump 7, and based on the assumed rotational speed n and the total flow rate Q of the coolant in the entire system. t Calculate the pressure rise ΔP of the water pump. pump . [0223.3] Step 3: Assume the flow rate of the coolant flowing through the fuel cell stack 5 is Q. stk The flow rate of the coolant flowing through deionizer 3 is Q. detion。 [0223.4] Step 4: Obtain the calculated flow rate Q of the coolant flowing through the fuel cell stack 5. c-stk The calculated flow rate Q of the coolant flowing through deionizer 3 c-detion . [0223.5] Step 5: Determine Q stk With Q c-stk Whether the difference between them is within the second preset range, and to determine Q detion With Q c-detion If the difference between them is within the second preset range, then Q is considered to be within the range of Q. stk Q represents the actual flow rate of the coolant flowing through fuel cell stack 5. detion If the actual flow rate of the coolant flowing through deionizer 3 is determined, proceed to step six; otherwise, return to step three for a new assumption. (In step five, if Q...) stk With Q c-stk The difference between them is within the second preset range, so Q can also be directly used. t -Q stk The difference is taken as the actual flow rate of the coolant flowing through deionizer 3, without needing to determine Q. detion With Q c-detion (Whether the difference between them is within the second preset range).

[0224] Step Six: Based on assumption Q stk The pressure drop ΔP of fuel cell stack 5 was calculated. stk According to the assumption Q detion The pressure drop ΔP of deionizer 3 was calculated. detion Based on the assumed flow rate Q through particulate filter 6 filt The pressure drop ΔP of particulate filter 6 was calculated. filt The total pressure drop ΔP is obtained. t =ΔP stk +ΔP detion+ ΔP filt .

[0225] Step seven: judging ΔP pump whether the difference between the total pressure drop ΔP t and the pump performance curve ΔP t is within a first preset range, if yes, indicating that the assumed rotating speed value is the rotating speed value required by the water pump 7 at the total flow value Q pump , otherwise, returning to step two to obtain a new assumed rotating speed value.

[0226] Through the above steps one to seven, the rotating speed value required by the water pump 7 at any flow value can be calculated, which can better meet the various business needs of users.

[0227] In combination with the above technical solution, in an implementation mode, the pump performance curve (ΔP pump corresponding expression) and the pipeline characteristic curve (ΔP t corresponding expression) can also be obtained, and the two are solved jointly, so that the rotating speed of the water pump at different flow values of the cooling liquid can be quickly and accurately obtained, as shown in FIG. 4. FIG. 4 is a schematic diagram of a calculation result of a rotating speed of a water pump according to a technical solution of the present application. In FIG. 4, there are multiple pump performance curves (in addition to the pipeline characteristic curve, the rest are pump performance curves), and the intersection points of different pump performance curves and the pipeline characteristic curve represent the rotating speed values required at different flow values.

[0228] In summary, the method of the present application can quickly and accurately calculate the rotating speed value required by the water pump 7 at different flow values, and the method has the following technical effects:

[0229] First, it can be applied to the water pump rotating speed adjustment and calibration process after the fuel cell thermal management system is assembled, avoiding the phenomenon of large error and long time in artificial calibration, and improving the calibration efficiency and accuracy.

[0230] Second, it can be applied to the determination of the water pump rotating speed when the fuel cell thermal management system is actually working, or as a backup scheme of the original adjustment scheme, to ensure the normal and stable working of the water pump.

[0231] Third, it can be applied to the structural design of the fuel cell thermal management system. Through the method of the present application, a large amount of data can be collected in advance for a certain structure of the battery thermal management system, which is helpful for the performance analysis of the fuel cell thermal management system and provides technical support for improving the fuel cell thermal management system.

[0232] As can be seen from the first and second points, the method of the present application can significantly reduce the dependence on artificial calibration data for water pump rotating speed adjustment in related technologies, and solve the problem of high calibration cost caused by the need to invest a large amount of materials, equipment and human resources in artificial calibration.

[0233] It should be noted that, for the method technical solutions, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the technical solutions of the present application are not limited by the action sequence described, because according to the technical solutions of the present application, certain steps can be adopted in other order or simultaneously. Secondly, those skilled in the art should know that the technical solutions described in the specification all belong to the preferred technical solutions, and the actions involved are not necessarily necessary for the technical solutions of the present application.

[0234] Based on the same inventive concept, one technical solution of the present application provides a device 500 for determining the rotating speed of a water pump in a fuel cell thermal management system. The device 500 can be used to determine the rotating speed of a water pump in a fuel cell thermal management system, wherein the fuel cell thermal management system comprises a plurality of different subsystems, each of the subsystems is provided with a corresponding pipeline, each of the subsystems is connected through the pipeline, the pipeline is used to flow cooling liquid to cool at least one of the subsystems, and the plurality of different subsystems comprises the water pump. Fig. 5 is a structural block diagram of a device for determining the rotating speed of a water pump in a fuel cell thermal management system according to one technical solution of the present application. As shown in Fig. 5, the device 500 comprises:

[0235] A first determining module 501 is configured to determine a plurality of target subsystems containing the water pump from the plurality of different subsystems, wherein the pipelines corresponding to the plurality of target subsystems form a flow circulation loop.

[0236] A second determining module 502 is configured to determine the pressure drop value of each of the target subsystems except the water pump, the assumed rotating speed value of the water pump, and the total flow value of the cooling liquid in the flow circulation loop, wherein the assumed rotating speed value is any value in a preset rotating speed range.

[0237] A third determining module 503 is configured to determine the pressure rise value of the water pump according to the assumed rotating speed value and the total flow value.

[0238] A fourth determining module 504 is configured to determine that the assumed rotating speed value is the rotating speed value required by the water pump under the total flow value if the difference between the sum of the pressure drop values of each of the target subsystems and the pressure rise value is within a first preset range.

[0239] Optionally, the second determining module 502 comprises:

[0240] A first determining sub-module is configured to determine the flow value of the cooling liquid in the pipeline corresponding to each of the target subsystems.

[0241] A second determining sub-module is configured to determine the pressure drop value of each of the target subsystems except the water pump according to each of the flow values.

[0242] Optionally, the second determining sub-module comprises:

[0243] a third determining sub-module configured to determine a pressure drop value of each of the target subsystems by using an equation ΔP 2 = dQ + eQ + f, wherein ΔP is the pressure drop value of the target subsystem, Q is the flow value of the cooling liquid flowing through the target subsystem, and d, e, and f are control coefficients of the target subsystem corresponding to the flow value.

[0244] Optionally, the third determining module 503 comprises:

[0245] a fourth determining sub-module configured to determine a pressure rise value of the water pump by using an equation ΔP pump = aQ t 2 + bQ t + c, wherein ΔP is the pressure rise value of the water pump, Q is the total flow value, and a, b, and c are control coefficients corresponding to the assumed rotating speed value. pump t

[0246] Optionally, the first determining module 501 comprises:

[0247] a fourth determining sub-module configured to determine a connection type between the plurality of subsystems, the connection type comprising a series connection and a parallel connection;

[0248] a fifth determining sub-module configured to determine at least one flow loop according to the connection type and the pipeline corresponding to each of the subsystems, each of the flow loops comprising the pipeline corresponding to the water pump;

[0249] a sixth determining sub-module configured to determine a plurality of target subsystems comprising the water pump according to the at least one flow loop.

[0250] Optionally, the sixth determining sub-module comprises:

[0251] a seventh determining sub-module configured to determine any one of the at least one flow loop as a first flow loop;

[0252] an eighth determining sub-module configured to determine each of the subsystems through which the cooling liquid flows in the first flow loop as the plurality of target subsystems.

[0253] Optionally, the sixth determining sub-module comprises:

[0254] a ninth determining sub-module configured to determine a second flow loop of the at least one flow loop, the number of the subsystems through which the cooling liquid flows in the second flow loop being the minimum of the number of the subsystems through which the cooling liquid flows in each of the flow loops.

[0255] ​​The tenth determining sub-module is configured to determine each subsystem in the second flow loop as the target subsystem.

[0256] Optionally, the first determining sub-module comprises:

[0257] The eleventh determining sub-module is configured to determine the flow value of the cooling liquid in the pipeline corresponding to each of the different subsystems by a preset algorithm.

[0258] The twelfth determining sub-module is configured to determine the flow value of the cooling liquid in the pipeline corresponding to each of the target subsystems according to the flow value of the cooling liquid in the pipeline corresponding to each of the subsystems.

[0259] Optionally, the different subsystems comprise a first subsystem, and the eleventh determining sub-module comprises:

[0260] The thirteenth determining sub-module is configured to determine a second subsystem in parallel with the first subsystem from the different subsystems.

[0261] The fourteenth determining sub-module is configured to determine a hypothetical flow value of the cooling liquid in the pipeline corresponding to the first subsystem, and a flow sum value of the cooling liquid in the pipeline corresponding to the first subsystem and the pipeline corresponding to the second subsystem, wherein the hypothetical flow value is an arbitrary value in a preset flow range.

[0262] The fifteenth determining sub-module is configured to determine a first resistance value corresponding to the first subsystem and a second resistance value corresponding to the second subsystem according to the hypothetical flow value.

[0263] The sixteenth determining sub-module is configured to determine the flow value of the cooling liquid in the pipeline corresponding to the first subsystem according to the flow sum value, the first resistance value, and the second resistance value.

[0264] Optionally, the fifteenth determining sub-module comprises:

[0265] The acquiring sub-module is configured to acquire the pressure drop of the first subsystem, the parameter of the pipeline corresponding to the first subsystem, and the density of the cooling liquid.

[0266] The seventeenth determining sub-module is configured to determine the first resistance value according to the hypothetical flow value, the pressure drop of the first subsystem, the parameter of the pipeline, and the density of the cooling liquid.

[0267] Optionally, the seventeenth determining sub-module comprises:

[0268] The eighteenth determining sub-module is configured to determine the system resistance value of the first subsystem according to the hypothetical flow value and the pressure drop of the first subsystem.

[0269] a nineteenth determining sub-module, configured to determine a pipe resistance value of the pipe corresponding to the first subsystem according to the parameter of the pipe and the density of the coolant;

[0270] a twentieth determining sub-module, configured to determine a sum of the system resistance value and the pipe resistance value as the first resistance value.

[0271] Optionally, the sixteenth determining sub-module comprises:

[0272] a twenty-first determining sub-module, configured to determine a flow calculation value of the coolant in the pipe corresponding to the first subsystem through an algorithm , wherein, represents the flow calculation value, represents the flow value, R1 represents the first resistance value, and R2 represents the second resistance value.

[0273] a twenty-second determining sub-module, configured to determine the flow assumption value as the flow value of the coolant in the pipe corresponding to the first subsystem if a difference between the flow calculation value and the flow assumption value is within a second preset range.

[0274] Optionally, the plurality of different subsystems comprise a first type of subsystem, a second type of subsystem, a water pump and a particle filter, the first type of subsystem comprises a parallelly connected intercooler and fuel cell stack, the second type of subsystem comprises a radiator, a heater, a deionizer and a temperature control valve, the radiator, the heater and the deionizer are parallelly connected with each other, the temperature control valve is arranged at a joint of outlets of the radiator and the heater respectively corresponding pipes, and the coolant flows through the particle filter, the first type of subsystem and the second type of subsystem in sequence under the driving of the water pump and then flows back to the water pump.

[0275] For the device technical solution, since it is basically similar to the method technical solution, the description is relatively simple, and the relevant parts can be referred to the part of the method technical solution.

[0276] The technical solution of the application further provides an electronic device, and FIG. 6 is a structural schematic diagram of an electronic device provided by a technical solution of the application. Referring to FIG. 6, the electronic device 600 comprises:

[0277] a processor 601;

[0278] a memory 602 for storing processor-executable instructions;

[0279] The processor 501 is configured to perform to implement the method for determining the rotating speed of the water pump.

[0280] In the technical solution, the electronic device can be any type of server or terminal device outside the vehicle (at this time, it can be used to predict the rotation speed of the water pump of the fuel cell thermal management system under different flow rates, and the prediction process can also be used in the calibration process), or a controller located inside the vehicle (calculating the rotation speed of the water pump under different flow rates when the fuel cell thermal management system of the vehicle is working normally).

[0281] The technical solution of the application further provides a non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of an electronic device, the electronic device can execute a method for determining the rotation speed of a water pump.

[0282] Those skilled in the art should understand that the technical solution of the application can be provided as a method, a system, or a computer program product. Therefore, the application can adopt a completely hardware technical solution, a completely software technical solution, or a technical solution combining software and hardware aspects. Moreover, the application can adopt a computer program product in the form of one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0283] The application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the technical solution of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a device for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0284] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction devices, which implement the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0285] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks.

[0286] Although the preferred embodiments of the application have been described, those skilled in the art will recognize changes and modifications which can be made to the preferred embodiments without departing from the spirit and scope of the application. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this application.

[0287] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for determining the speed of a water pump in a fuel cell thermal management system, applied to a fuel cell thermal management system comprising multiple different subsystems, each subsystem having a corresponding pipeline, the subsystems being interconnected via the pipelines, the pipelines being used to flow coolant to cool at least one of the subsystems, the multiple different subsystems including a water pump; the method comprising: Among the multiple different subsystems, multiple target subsystems containing the water pump are identified, and the pipelines corresponding to each of the multiple target subsystems constitute a flow loop; Determine the pressure drop value of each target subsystem other than the water pump, the assumed speed value of the water pump, and the total flow rate of the coolant in the flow loop, wherein the assumed speed value is any value within a preset speed range; The pressure rise of the water pump is determined based on the assumed rotational speed and the total flow rate. If the difference between the sum of the pressure drop values ​​and the pressure rise value is within a first preset range, the assumed rotational speed value is determined to be the rotational speed value required by the water pump under the total flow rate.

2. The method according to claim 1, wherein, Determining the pressure drop value of each of the target subsystems other than the water pump includes: determining the flow rate of the coolant in the pipeline corresponding to each of the target subsystems; Based on the respective flow rates, the pressure drop values ​​of each of the target subsystems, excluding the water pump, are determined.

3. The method according to claim 2, wherein, Determining the pressure drop value of each target subsystem other than the water pump based on each of the flow rates includes: The formula ΔP=dQ is used. 2 +eQ+f determines the pressure drop value of each of the target subsystems, where ΔP is the pressure drop value of the target subsystem, Q is the flow rate of the coolant flowing through the target subsystem, and d, e, and f are the control coefficients of the target subsystem at the corresponding flow rates.

4. The method according to claim 1, wherein, Determining the pressure rise of the water pump based on the assumed rotational speed and the total flow rate includes: Using the formula ΔP pump =aQ t 2 +bQ t +c determines the pressure rise value of the water pump, where ΔP pump Q represents the pressure rise of the water pump. t The total flow rate is given, and a, b, and c are control coefficients corresponding to the assumed rotational speed.

5. The method according to claim 1, wherein, Among multiple different subsystems, several target subsystems containing the water pump are identified, including: Determine the connection type among the plurality of subsystems, the connection type including series and parallel; Based on the connection type and the pipelines corresponding to each of the subsystems, at least one flow loop is determined, and each flow loop includes the pipeline corresponding to the water pump. Based on the at least one flow loop, a plurality of target subsystems including the water pump are determined.

6. The method according to claim 5, wherein, The step of determining multiple target subsystems including the water pump based on the at least one flow loop includes: Determine any one of the at least one flow loops as the first flow loop; Each subsystem through which the coolant flows in the first flow loop is identified as the plurality of target subsystems.

7. The method according to claim 5, wherein, The step of determining multiple target subsystems including the water pump based on the at least one flow loop includes: A second flow loop is determined in the at least one flow loop, wherein the number of subsystems through which the coolant flows in the second flow loop is the minimum among the number of subsystems through which the coolant flows in each of the flow loops; Each subsystem through which the coolant flows in the second flow loop is identified as the plurality of target subsystems.

8. The method according to claim 2, wherein, Determining the flow rate of coolant in the pipelines corresponding to each of the target subsystems includes: The flow rate of coolant in the pipelines of each of the multiple different subsystems is determined by a preset algorithm. The flow rate of the coolant in the pipeline corresponding to each of the subsystems is determined based on the flow rate of the coolant in the pipeline corresponding to each of the subsystems.

9. The method according to claim 8, wherein, The plurality of different subsystems includes a first subsystem. The step of determining the flow rate of coolant in the pipes corresponding to each of the plurality of different subsystems using a preset algorithm includes: Among the multiple different subsystems, a second subsystem connected in parallel with the first subsystem is identified; Determine the assumed flow rate of the coolant in the pipeline corresponding to the first subsystem, and the flow rate and value of the coolant in the pipeline corresponding to the first subsystem and the pipeline corresponding to the second subsystem, wherein the assumed flow rate is any value within a preset flow rate range; Based on the assumed flow rate value, determine the first resistance value corresponding to the first subsystem and the second resistance value corresponding to the second subsystem; Based on the flow rate and value, the first resistance value, and the second resistance value, the flow rate of the coolant in the pipeline corresponding to the first subsystem is determined.

10. The method according to claim 9, wherein, Determining the first resistance value corresponding to the first subsystem based on the assumed flow rate value includes: Obtain the pressure drop of the first subsystem, the parameters of the pipeline corresponding to the first subsystem, and the density of the coolant; The first resistance value is determined based on the assumed flow rate, the pressure drop of the first subsystem, the parameters of the pipeline, and the density of the coolant.

11. The method according to claim 10, wherein, Determining the first resistance value based on the assumed flow rate, the pressure drop of the first subsystem, the parameters of the pipeline, and the density of the coolant includes: Based on the assumed flow rate value and the pressure drop of the first subsystem, the system resistance value of the first subsystem is determined; Based on the parameters of the pipeline and the density of the coolant, determine the pipeline resistance value of the pipeline corresponding to the first subsystem; The sum of the system resistance value and the pipeline resistance value is determined as the first resistance value.

12. The method according to claim 9, wherein, Determining the flow rate of the coolant in the pipeline corresponding to the first subsystem based on the flow rate, the first resistance value, and the second resistance value includes: Through formula Determine the calculated flow rate of the coolant in the pipeline corresponding to the first subsystem, wherein, This represents the calculated flow rate value. The values ​​represent the flow rate and value, where R1 represents the first resistance value and R2 represents the second resistance value. If the difference between the calculated flow rate and the assumed flow rate is within a second preset range, the assumed flow rate is determined to be the flow rate of the coolant in the pipeline corresponding to the first subsystem.

13. The method according to any one of claims 1-12, wherein, The multiple different subsystems include a first type of subsystem, a second type of subsystem, a water pump, and a particulate filter. The first type of subsystem includes a parallel intercooler and a fuel cell stack. The second type of subsystem includes a radiator, a heater, a deionizer, and a temperature control valve. The radiator, heater, and deionizer are connected in parallel. The temperature control valve is located at the junction of the outlets of the corresponding pipes of the radiator and the heater. The coolant flows sequentially through the particulate filter, the first type of subsystem, and the second type of subsystem under the drive of the water pump and flows back to the water pump.

14. A device for determining the speed of a water pump in a fuel cell thermal management system, wherein, An apparatus is used in a fuel cell thermal management system, the fuel cell thermal management system comprising multiple different subsystems, each subsystem having corresponding piping, and the subsystems being interconnected via the piping. The piping is used to flow coolant to cool at least one of the subsystems, and the multiple different subsystems include water pumps; the apparatus includes: The first determining module is used to determine, among the multiple different subsystems, multiple target subsystems including the water pump, wherein the pipelines corresponding to each of the multiple target subsystems constitute a flow loop; The second determining module is used to determine the pressure drop value of each of the target subsystems other than the water pump, the assumed speed value of the water pump, and the total flow rate of the coolant in the flow circuit, wherein the assumed speed value is any value within a preset speed range; The third determining module is used to determine the pressure rise value of the water pump based on the assumed rotational speed value and the total flow rate value; The fourth determining module is used to determine the assumed rotational speed as the required rotational speed of the water pump under the total flow rate if the difference between the sum of the various pressure drop values ​​and the pressure rise value is within a first preset range.

15. An electronic device comprising: processor; Memory used to store the processor's executable instructions; The processor is configured to execute a method for determining the water pump speed in a fuel cell thermal management system as described in any one of claims 1 to 13.

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