Fuel cell cooling system flow determination method, apparatus, and electronic device

Abstract

The application provides a flow determination method and device of a fuel cell cooling system and electronic equipment, and relates to the technical field of fuel cells, and comprises the following steps: determining a pressure value of a water pump inlet according to a calibrated value of a stack inlet pressure and a measured value of the stack inlet pressure under a current working condition; performing difference calculation on the measured value of the stack inlet pressure and the pressure value of the water pump inlet to obtain a water pump lift; and determining a current main path flow of the cooling system according to a full-speed map curve of the water pump and the water pump lift. The main path flow is detected without adding a flow detection device, so as to alleviate the technical problems such as errors and hysteresis caused by not considering the main path flow in the prior art in the adjustment of the battery pack temperature.

Description

Technical Field

[0001] This invention relates to the technical field of fuel cells, and in particular to a method, apparatus, and electronic device for determining the flow rate of a fuel cell cooling system. Background Technology

[0002] With the development of vehicle technology, fuel cell vehicles are being widely used, and the safety of fuel cells in these vehicles is receiving increasing attention.

[0003] The inventors discovered that the main flow rate of the cooling system plays a crucial role in the battery thermal management system's temperature regulation of the battery pack. Involving this main flow rate in thermal management ensures the accuracy and timeliness of battery pack temperature regulation. However, current cooling systems generally do not consider measuring the main flow rate. Furthermore, the inventors found that measuring this main flow rate in existing technologies requires adding a flow sensor or flow meter to the cooling system. This measurement method results in a less compact system layout, increased costs due to additional electrical components, and increased complexity related to EMC (electromagnetic interference). Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, and electronic device for determining the flow rate of a fuel cell cooling system. By detecting the main flow rate without adding a flow detection device, this invention alleviates the technical problems in the prior art, such as errors and lags caused by not considering the impact of the main flow rate on the battery pack temperature regulation.

[0005] In a first aspect, embodiments of the present invention provide a method for determining the flow rate of a fuel cell cooling system, the method comprising:

[0006] The pressure value at the pump inlet is determined based on the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure under the current operating conditions.

[0007] The pump head is obtained by calculating the difference between the measured value of the fuel cell inlet pressure and the pressure value of the pump inlet.

[0008] The current main flow rate of the cooling system is determined based on the full speed Map curve of the water pump and the pump head.

[0009] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the cooling system includes an overflow tank in an atmospheric pressure open state to ensure that the pressure value at the water pump inlet is the same as the atmospheric pressure value.

[0010] In conjunction with the first aspect, this embodiment of the invention provides a second possible implementation of the first aspect, wherein the current operating condition includes multiple operating conditions corresponding to different altitudes, and the step of determining the pressure value at the pump inlet based on the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure under the current operating condition includes:

[0011] Obtain the measured value of the fuel cell stack inlet pressure under the current altitude and corresponding operating conditions;

[0012] Based on the fuel cell stack inlet pressure calibration value and the measured fuel cell stack inlet pressure value, determine the pump inlet pressure value under the current altitude and corresponding operating conditions.

[0013] In conjunction with the first aspect, this invention provides a third possible implementation of the first aspect, wherein the step of determining the pump inlet pressure value under the current altitude operating conditions based on the fuel cell stack inlet pressure calibration value and the measured fuel cell stack inlet pressure value includes:

[0014] The pressure difference during vehicle operation is calculated based on the difference between the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure.

[0015] Based on the difference between the standard atmospheric pressure at sea level and the pressure difference at the current altitude, the pressure value at the pump inlet under the operating conditions corresponding to the current altitude is determined.

[0016] In conjunction with the first aspect, embodiments of the present invention provide a fourth possible implementation of the first aspect, wherein the method further includes:

[0017] The current main flow rate is sent to the battery thermal management system so that the battery thermal management system can regulate the temperature of the battery pack by controlling the cooling system based on the current main flow rate.

[0018] In conjunction with the first aspect, this invention provides a fifth possible implementation of the first aspect, wherein the step of determining the current main flow rate of the cooling system based on the full-speed Map curve of the water pump and the water pump head includes:

[0019] Get the current pump speed;

[0020] Based on the full-speed Map curve of the water pump, the water pump head, and the speed, the current main flow rate corresponding to the cooling system is determined.

[0021] In conjunction with the first aspect, this invention provides a sixth possible implementation of the first aspect, wherein, before the step of determining the pump inlet pressure value based on the measured value of the fuel cell stack inlet pressure and the calibrated value of the fuel cell stack inlet pressure under the current operating conditions, the method further includes:

[0022] The full-speed Map curve of the water pump is pre-calibrated, and the inlet pressure calibration value of the fuel cell stack at different speeds is obtained.

[0023] Secondly, embodiments of the present invention also provide a flow rate determination device for a fuel cell cooling system, the device comprising:

[0024] The first determining module determines the pressure value at the pump inlet based on the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure under the current operating conditions.

[0025] The calculation module calculates the difference between the measured value of the fuel cell stack inlet pressure and the pressure value of the water pump inlet to obtain the water pump head.

[0026] The second determining module determines the current main flow rate of the cooling system based on the full speed Map curve of the water pump and the water pump head.

[0027] Thirdly, an embodiment provides an electronic device including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the method described in any of the foregoing embodiments.

[0028] Fourthly, an embodiment provides a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to perform the steps of the method described in any of the foregoing embodiments.

[0029] This invention provides a method, apparatus, and electronic device for determining the flow rate of a fuel cell cooling system. Without adding additional flow sensors, it determines the pump inlet pressure using the stack inlet pressure calibration value and measured values. Based on the pressure difference between the pump inlet and outlet, the pump head is obtained. It also considers the collectable pump self-feedback speed and the pump's full-speed Map curve, enabling the determination of the main flow rate of the cooling system under current operating conditions, thus facilitating timely and effective thermal management of the battery pack.

[0030] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A flowchart of a method for determining the flow rate of a fuel cell cooling system provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a cooling system structure is provided for an embodiment of the present invention;

[0035] Figure 3 A schematic flowchart of another method for determining the flow rate of a fuel cell cooling system provided in an embodiment of the present invention;

[0036] Figure 4 This is a functional module diagram of a flow rate determination device for a fuel cell cooling system provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the hardware architecture of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The fuel cell cooling system is used to regulate the operating temperature of the fuel cell and ensure that the fuel cell has good power output under different operating conditions.

[0040] A complete fuel cell cooling system typically includes:

[0041] (1) A water pump, used to drive the flow of coolant;

[0042] (2) Temperature control valve, used to adjust the opening or closing of the circuit;

[0043] (3) Heat sink, in conjunction with fan, dissipates the heat inside the system to the external environment;

[0044] (4) Overflow tank, used to ensure that the cooling system has a suitable liquid volume and to receive air bubbles generated in the system;

[0045] (5) Pipes used to connect the above-mentioned components.

[0046] Currently, the application temperature of fuel cells is generally monitored through a battery thermal management system, and the temperature is adjusted in real time through a cooling system. However, this adjustment method has significant errors and lag. If the vehicle is in a low-temperature environment, the timely and accurate temperature adjustment of the battery cannot be guaranteed, which will affect the battery's working efficiency and the vehicle's power performance.

[0047] The inventors discovered that timely temperature regulation of the cooling system can be achieved by monitoring the flow rate in the main cooling circuit. However, fuel cell vehicles generally do not monitor the flow rate in the main cooling circuit, making it difficult to monitor the operating status of the cooling circuit water pump and the magnitude of the main cooling flow rate, which is detrimental to the thermal management and control of the vehicle's fuel cell.

[0048] Based on this, the present invention provides a method, apparatus, and electronic device for determining the flow rate of a fuel cell cooling system, which can monitor the main flow rate of the cooling system without setting a flow detection component in the loop, ensuring timely adjustment of the battery pack temperature while saving costs.

[0049] To facilitate understanding of this embodiment, a method for determining the flow rate of a fuel cell cooling system disclosed in this embodiment of the invention will first be described in detail.

[0050] The structure of the cooling system can be as follows: Figure 2 As shown, this cooling system does not include flow detection components; the fuel cell stack is a device that generates electricity through the reaction of hydrogen and oxygen. The radiator dissipates heat from the cooling system to the external environment and can be used in conjunction with a fan. A three-way thermostatic valve is used to regulate the opening and closing of the circuit. A water pump drives the coolant to circulate within the system. An overflow tank stores coolant, ensuring a suitable coolant level in the system and catching any air bubbles generated by the coolant to prevent air lock. Pressure sensors P1 and P2 are also installed at both the fuel cell stack inlet and outlet to measure the pressure values ​​at the fuel cell stack inlet and outlet.

[0051] like Figure 1 As shown, the method includes:

[0052] Step S102: Determine the pressure value at the pump inlet based on the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure under the current operating conditions.

[0053] The inlet pressure of the fuel cell stack varies under different operating conditions. The measured value of the inlet pressure of the fuel cell stack under each operating condition can be obtained by the pressure sensor at the inlet of the fuel cell stack. The calibrated value of the inlet pressure of the fuel cell stack is obtained by pre-calibration. The calibrated value of the inlet pressure of the fuel cell stack is calibrated under the condition that the vehicle battery is traveling at sea level. That is, under different operating conditions, the calibrated value of the inlet pressure of the fuel cell stack corresponds to the condition that the vehicle battery is traveling at sea level.

[0054] Step S104: Calculate the difference between the measured value of the fuel cell stack inlet pressure and the pressure value of the water pump inlet to obtain the water pump head.

[0055] Understandably, according to Figure 2 It is known that one of the pressure sensors is located between the fuel cell inlet pressure and the water pump outlet pressure, and the fuel cell inlet pressure is equivalent to the water pump outlet pressure.

[0056] Step S106: Determine the current main flow rate of the cooling system based on the full speed Map curve of the water pump and the water pump head.

[0057] The full-speed map curve of this water pump reveals the relationship between the pump's speed, head, and current main flow rate. As can be understood, a water pump map curve (also called a contour map or cloud map) is a data curve generated during water pump testing, primarily reflecting the distribution of pump efficiency at different speeds and torques. As an optional implementation, the water pump map curve can be generated by detecting the efficiency points of the pump at various speeds and torques, importing this data into the control equipment, and then using MATLAB to plot the curve.

[0058] In a preferred embodiment of practical application, the pressure value at the inlet of the water pump can be determined by using the calibrated and measured values ​​of the fuel cell stack inlet pressure without adding additional flow sensors. Then, based on the pressure difference between the inlet and outlet of the water pump, the water pump head can be obtained. Taking into account the collectable self-feedback speed of the water pump and the full speed Map curve of the water pump, the main flow rate of the cooling system under the current operating conditions can be obtained, which is beneficial to the timely and effective thermal management of the battery pack.

[0059] In some embodiments, a more effective battery pack thermal management scheme can be adopted compared to a thermal management system that adjusts the battery pack temperature based on temperature; exemplarily, the above method further includes:

[0060] Step 1.1) The current main flow rate is sent to the battery thermal management system so that the battery thermal management system can adjust the temperature of the battery pack by controlling the cooling system based on the current main flow rate.

[0061] It should be noted that, given the current main flow rate, the thermal management system can directly monitor and adjust the main flow rate of the fuel cell cooling system according to the target cooling flow rate corresponding to the current operating conditions, thereby alleviating the technical problem of lag in the temperature regulation of fuel cells in the existing technology.

[0062] It is understandable that when the thermal management system regulates the battery pack temperature based on temperature, there are defects such as battery pack temperature acquisition error and temperature acquisition delay. The thermal management system controls the main flow of the cooling system to regulate the battery pack temperature based on the acquired temperature, which will produce greater errors and lag, which is not conducive to the reliability of battery pack application during vehicle operation.

[0063] In some embodiments, parameters can be pre-calibrated to ensure more accurate measurement of the main flow rate of the cooling system; exemplarily, before step S102, the above method further includes:

[0064] Step 2.1) Pre-calibrate the full-speed Map curve of the water pump and obtain the calibration value of the fuel cell inlet pressure at different speeds.

[0065] For example, at sea level (atmospheric pressure 101.325 kPa), using the coolant actually used in the vehicle, the full-speed map curve of the water pump can be calibrated, and the pressure values ​​at the fuel cell inlet at different speeds can be obtained, i.e., the fuel cell inlet pressure calibration value (at sea level). Combining the above two parameters forms a... Figure 3 The table shown can be used to obtain the fuel cell stack inlet pressure calibration value (sea level) at different pump speeds. As an optional embodiment, the above parameter correspondence can be input into the software program or control device as the basic parameter for subsequent flow determination and control methods.

[0066] In some embodiments, the cooling system includes an overflow tank in an atmospheric pressure open state to ensure that the pressure at the water pump inlet is the same as the atmospheric pressure.

[0067] In other words, the overflow tank is opened at atmospheric pressure to ensure that the cooling water circuit is connected to the atmosphere and to ensure that the pressure value at the water pump inlet is the same as the atmospheric pressure.

[0068] Based on the aforementioned embodiments ensuring that the pressure value at the water pump inlet is the same as the atmospheric pressure value, since the current operating conditions include various operating conditions corresponding to different altitudes, this embodiment of the invention can not only determine the main road flow rate under the current altitude operating conditions, but also determine the main road flow rate of the vehicle under any different altitude operating conditions, so as to ensure the safety and reliability of vehicle operation; wherein, the main road flow rate can be determined for any altitude, for example, step S102 includes:

[0069] Step 3.1) Obtain the measured value of the fuel cell stack inlet pressure under the current altitude and operating conditions.

[0070] Here, the measured pressure value corresponding to the altitude at this time can be obtained through the pressure sensor installed at the fuel cell inlet.

[0071] Step 3.2): Determine the pump inlet pressure value under the current altitude corresponding to the operating conditions based on the fuel cell stack inlet pressure calibration value and the measured fuel cell stack inlet pressure value.

[0072] For example, the pressure difference at the current altitude of the vehicle is calculated based on the difference between the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure; the pressure value at the water pump inlet under the current altitude is determined based on the difference between the standard atmospheric pressure corresponding to sea level and the pressure difference at the current altitude.

[0073] The atmospheric pressure corresponding to this sea level is the standard atmospheric pressure at an altitude of 0, which is 101.325 kPa. Those skilled in the art can easily determine the standard atmospheric pressure at various altitudes. It is understood that the atmospheric pressure at the current altitude is obtained by comparing the standard atmospheric pressure at this sea level with the pressure difference at the current altitude. As described in the foregoing embodiment, when the overflow tank is open at atmospheric pressure, the pressure at the pump inlet is the same as atmospheric pressure. Therefore, the atmospheric pressure at the current altitude can be equated to the pressure at the pump inlet under the corresponding operating conditions at the current altitude.

[0074] Furthermore, in practical applications, the current altitude of the vehicle can be deduced from the atmospheric pressure value at the current altitude, so that the driver can control the vehicle to perform operations such as adjusting tire pressure.

[0075] It should be noted that the main flow rate of the cooling system can be obtained under all altitude conditions, which can help the fuel cell system determine the operating status of the water pump and the magnitude of the main flow rate. This main flow rate can serve as an important input parameter for thermal management temperature control.

[0076] In some embodiments, the correlation between parameters characterized by the full-speed Map curve of the water pump can determine a relatively accurate main flow rate of the cooling system without the need for flow detection devices. Step S106 includes:

[0077] Step 4.1) Obtain the current pump speed.

[0078] Step 4.2) Determine the current main flow rate of the cooling system based on the full speed Map curve of the water pump, the water pump head and speed.

[0079] like Figure 3As shown, a full-speed map curve of the water pump is pre-calibrated, and the fuel cell inlet pressure at different pump speeds is also calibrated. Based on this full-speed map curve and the pump's feedback speed, the pressure difference between the calibrated and measured fuel cell inlet pressures at different altitudes is compared. For example, at a pump speed of 1000 Rpm, the calibrated fuel cell inlet pressure is A, the measured pressure is B, and the pressure difference is AB. Based on this pressure difference, the vehicle's altitude and the pump inlet pressure can be calculated. The difference between the fuel cell inlet pressure and the pump inlet pressure is the pump head. Then, based on the correlation between the parameters represented in the calibrated full-speed map curve, the main road flow rate can be calculated using the obtained pump head and speed.

[0080] Understandably, the full-speed map curve of the water pump can characterize the relationship between the pump head, speed, and main flow path; if any two of these parameters are known, the values ​​of the remaining parameters can be determined based on the curve.

[0081] In this embodiment of the invention, the inlet pressure sensor conventionally installed in the internal water circuit of the fuel cell system is used to replace the flow sensor, which reduces redundant design and lowers the system operating cost. The main flow value is calculated based on the actual measured value of the fuel cell inlet measured by the pressure sensor and the water pump calibration value. The thermal management control strategy is guided by the main flow value and the water circuit status is monitored.

[0082] like Figure 4 As shown, this embodiment of the invention provides a flow rate determination device for a fuel cell cooling system. The cooling system does not have a flow rate detection component. The device includes:

[0083] The first determining module determines the pressure value at the pump inlet based on the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure under the current operating conditions.

[0084] The calculation module calculates the difference between the measured value of the fuel cell stack inlet pressure and the pressure value of the water pump inlet to obtain the water pump head.

[0085] The second determining module determines the current main flow rate of the cooling system based on the full speed Map curve of the water pump and the water pump head.

[0086] This invention eliminates the need for additional flow sensors in the cooling system, avoiding drawbacks such as high cost and complex system structure. Furthermore, it provides the actual flow rate of the main cooling path under all altitude conditions without the need for additional flow sensors, using this data as a parameter to guide thermal management control strategies. This cooling system design is simpler and less expensive.

[0087] In some embodiments, the cooling system includes an overflow tank in an atmospheric pressure open state to ensure that the pressure at the water pump inlet is the same as the atmospheric pressure.

[0088] In some embodiments, the current operating condition includes multiple operating conditions corresponding to different altitudes. The first determining module is further specifically used to: obtain the measured value of the fuel cell stack inlet pressure under the current altitude operating condition; and determine the pressure value of the water pump inlet under the current altitude operating condition based on the fuel cell stack inlet pressure calibration value and the measured value of the fuel cell stack inlet pressure.

[0089] In some embodiments, the first determining module is further specifically used to calculate the pressure difference at the current altitude of the vehicle based on the difference between the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure; and to determine the pressure value of the water pump inlet under the operating condition corresponding to the current altitude based on the difference between the standard atmospheric pressure corresponding to sea level and the pressure difference at the current altitude.

[0090] In some embodiments, the apparatus further includes: an adjustment module for sending the current main flow rate to a battery thermal management system, so that the battery thermal management system adjusts the temperature of the battery pack by controlling the cooling system based on the current main flow rate.

[0091] In some embodiments, the second determining module is further specifically used to obtain the current speed of the water pump; and to determine the current main flow rate of the cooling system based on the full speed Map curve of the water pump, the water pump head, and the speed.

[0092] In some embodiments, before determining the pump inlet pressure value based on the measured value of the fuel cell stack inlet pressure and the fuel cell stack inlet pressure calibration value under the current operating conditions, the device further includes: a calibration module for pre-calibrating the full-speed Map curve of the pump and obtaining the fuel cell stack inlet pressure calibration value at different speeds.

[0093] The present invention provides an embodiment for implementing an electronic device. In this embodiment, the electronic device may be, but is not limited to, a personal computer (PC), a laptop computer, a monitoring device, a server, or other computer device with analysis and processing capabilities.

[0094] As an exemplary embodiment, see [link to example]. Figure 5 The electronic device 110 includes a communication interface 111, a processor 112, a memory 113, and a bus 114. The processor 112, the communication interface 111, and the memory 113 are connected via the bus 114. The memory 113 is used to store a computer program that supports the processor 112 in executing the above-described method. The processor 112 is configured to execute the program stored in the memory 113.

[0095] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, etc. For example, machine-readable storage media can be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or combinations thereof.

[0096] Non-volatile media can be non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar non-volatile storage media, or combinations thereof.

[0097] It is understood that the specific operation methods of each functional module in this embodiment can be referred to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0098] The computer-readable storage medium provided in the embodiments of the present invention stores a computer program. When the computer program code is executed, it can implement the method described in any of the above embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0099] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0100] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0101] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0102] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for determining the flow rate of a fuel cell cooling system, characterized in that, The cooling system includes an overflow tank that is open at atmospheric pressure to ensure that the pressure at the water pump inlet is the same as the atmospheric pressure. The method includes: The pressure difference at the current altitude of the vehicle is calculated based on the difference between the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure; the pressure value at the water pump inlet under the current altitude is determined based on the difference between the standard atmospheric pressure corresponding to sea level and the pressure difference at the current altitude. The pump head is obtained by calculating the difference between the measured value of the fuel cell inlet pressure and the pressure value of the pump inlet. The current main flow rate of the cooling system is determined based on the full speed Map curve of the water pump and the water pump head.

2. The method according to claim 1, characterized in that, The current operating conditions include various conditions corresponding to different altitudes. Before determining the pressure value at the pump inlet, the following steps are also included: Obtain the measured value of the fuel cell stack inlet pressure under the current altitude and operating conditions.

3. The method according to claim 1, characterized in that, The method further includes: The current main flow rate is sent to the battery thermal management system so that the battery thermal management system can regulate the temperature of the battery pack by controlling the cooling system based on the current main flow rate.

4. The method according to claim 1, characterized in that, The steps for determining the current main flow rate of the cooling system based on the full-speed Map curve of the water pump and the pump head include: Get the current pump speed; Based on the full-speed Map curve of the water pump, the water pump head, and the speed, the current main flow rate corresponding to the cooling system is determined.

5. The method according to claim 1, characterized in that, Before the step of determining the pump inlet pressure value based on the fuel cell stack inlet pressure calibration value and the measured fuel cell stack inlet pressure value under current operating conditions, the method further includes: The full-speed Map curve of the water pump is pre-calibrated, and the inlet pressure calibration value of the fuel cell stack at different speeds is obtained.

6. A flow rate determination device for a fuel cell cooling system, characterized in that, The cooling system includes an overflow tank that is open at atmospheric pressure to ensure that the pressure at the water pump inlet is the same as the atmospheric pressure. The device includes: The first determining module calculates the pressure difference at the current altitude of the vehicle based on the difference between the calibrated value of the fuel cell stack inlet pressure and the measured value of the fuel cell stack inlet pressure; and determines the pressure value of the water pump inlet under the current altitude operating condition based on the difference between the standard atmospheric pressure corresponding to sea level and the pressure difference at the current altitude. The calculation module calculates the difference between the measured value of the fuel cell stack inlet pressure and the pressure value of the water pump inlet to obtain the water pump head; The second determining module determines the current main flow rate of the cooling system based on the full speed Map curve of the water pump and the water pump head.

7. An electronic device, characterized in that, It includes a memory, a processor, and a program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The readable storage medium stores a computer program that, when executed, implements the method described in any one of claims 1-5.

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