Method and device for judging completion of cooling liquid filling of fuel cell system

Abstract

The invention provides a method and a device for judging completion of coolant filling of a fuel cell system, and relates to the technical field of fuel cells, the method comprises the following steps: using a simulation system to simulate simultaneous coolant filling of a plurality of fuel cell systems, and obtaining the current target coolant volume of each fuel cell system; based on the current target cooling liquid volume of each fuel cell system, calculating a confidence interval of the cooling liquid volume; whether the volume of the actually filled cooling liquid belongs to the confidence interval of the volume of the cooling liquid or not is judged, if yes, filling is completed, the technical problems that in the prior art, judgment accuracy is low, and efficiency is low are solved, and the technical effect of improving detection efficiency and accuracy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a method and device for judging whether the filling of coolant in a fuel cell system is completed. Background Art

[0002] The fuel cell system needs to be filled with coolant during factory inspection. The filling of coolant involves multiple internal system components (such as coolant pump, pipeline pressure sensor, bypass valve) and external system components (overflow tank and liquid level sensor, injection controller). When multiple systems are inspected at the factory, coolant needs to be frequently filled. This process usually requires manual operation of multiple components according to the situation. The basic process is as follows: First, the coolant is injected into the overflow tank, and part of the coolant flows into the system pipeline. The coolant pump is turned on. As the gas in the pipeline is discharged, the coolant in the overflow tank continues to flow into the system pipeline. The bypass valve position is adjusted and the above operation is repeated until the pipeline pressure stabilizes. The coolant filling is completed. In the above process, it is usually necessary to pay attention to the pipeline pressure at all times and manually judge the timing of the filling to complete the coolant filling.

[0003] In the prior art, it is also possible to determine whether the filling is completed based on the liquid level in the overflow tank (expansion tank): if the liquid level is lower than the minimum value, continue to add coolant; if the liquid level is between the minimum and maximum values, start the cooling system circulating water pump to exhaust air until the liquid level in the expansion tank stops decreasing within a predetermined time. Since the liquid level in the expansion tank stops decreasing within a short period of time, it does not mean that the gas has been completely exhausted, so it is impossible to accurately determine whether the coolant has been filled, and the accuracy of coolant filling is low.

[0004] That is to say, the existing method of judging whether the refilling of coolant in a fuel cell system is complete has technical problems of low accuracy and low efficiency. Summary of the invention

[0005] The object of the present invention is to provide a method and device for determining whether the refilling of coolant in a fuel cell system is complete, so as to alleviate the technical problems of low judgment accuracy and low efficiency existing in the prior art.

[0006] In a first aspect, an embodiment of the present invention provides a method for determining whether the refilling of coolant in a fuel cell system is completed, the method comprising: using a simulation system to simulate the refilling of coolant in a plurality of fuel cell systems at the same time, and obtaining a current target coolant volume of each of the above fuel cell systems;

[0007] Calculating a confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system;

[0008] Determine whether the actual volume of the added coolant falls within the confidence interval of the above coolant volume. If so, the filling is completed.

[0009] In some optional implementations, the coolant filling system is applied, and the coolant filling system includes: an overflow tank, a liquid level sensor, a liquid filling controller, a coolant pump, a pipeline pressure sensor, and a bypass valve;

[0010] The steps of using a simulation system to simulate the simultaneous filling of coolant into a plurality of fuel cell systems and obtaining a current target coolant volume of each fuel cell system include:

[0011] Use the simulation system to simulate several coolant filling controllers in the coolant filling system to fill the overflow tank with coolant at the same time;

[0012] Obtaining the injection speed of each of the above fuel cell systems through the above injection controller;

[0013] Based on the above injection speed and injection time, a target coolant volume of each of the above fuel cell systems is determined.

[0014] In some optional implementations, based on the above injection speed and filling time, the calculation formula for determining the target coolant volume of each of the above fuel cell systems is:

[0015] Among them, t1 is the filling start time; t2 is the filling end time; v is the filling speed obtained by the filling controller; i represents the i-th fuel cell system.

[0016] In some optional implementations, the above method further includes:

[0017] Turning on the coolant pump according to a preset combination of the rotation speed of the coolant pump and the opening value of the bypass valve;

[0018] The pipeline pressure sensor is used to obtain the pipeline pressure under different combinations;

[0019] The standard deviations of the above pipeline pressures are calculated respectively according to the preset order in the combination.

[0020] In some optional implementations, the combination of the preset rotation speed of the coolant pump and the opening value of the bypass valve includes:

[0021] When the bypass valve is set to the first opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively;

[0022] When the bypass valve is set to the second opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively;

[0023] When the bypass valve is set to the third opening degree, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively;

[0024] When the bypass valve is set to the fourth opening degree, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively;

[0025] Among them, the first opening degree<the second opening degree<the third opening degree<the fourth opening degree; the first rotational speed<the second rotational speed<the third rotational speed.

[0026] In some optional implementations, the step of respectively calculating the standard deviation of the pipeline pressure in a preset order in the combination includes: calculating the standard deviation of the pipeline pressure using a plurality of first pressure values ​​fed back by the pipeline pressure sensor within a preset time; the calculation formula is: Among them, P j is the first pressure value; is the average pressure value.

[0027] In some optional implementations, the method further includes: using the liquid level sensor to obtain the current liquid level height in the overflow tank in real time, and determining whether the current liquid level height satisfies a first threshold; if so, suspending the liquid injection, and if not, continuing to add coolant.

[0028] In a second aspect, an embodiment of the present invention provides a device for determining whether the refilling of coolant in a fuel cell system is completed, the device comprising:

[0029] A simulation module, used to simulate the simultaneous filling of coolant into a plurality of fuel cell systems using a simulation system, and obtain the current target coolant volume of each of the above fuel cell systems;

[0030] The simulation module is further used to calculate a confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system;

[0031] The judgment module is used to judge whether the actual volume of the coolant added belongs to the confidence interval of the coolant volume. If so, the filling is completed.

[0032] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, and when the processor executes the computer program, the steps of any one of the methods described in the first aspect are implemented.

[0033] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to execute any method described in the first aspect above.

[0034] The present invention provides a method and device for judging whether the refilling of coolant in a fuel cell system is complete. The method comprises: using a simulation system to simulate the refilling of coolant in several fuel cell systems at the same time, and obtaining the current target coolant volume of each fuel cell system; calculating the confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system; judging whether the actual refilled coolant volume belongs to the confidence interval of the coolant volume, and if so, the refilling is complete. The method alleviates the technical problems of low judgment accuracy and low efficiency existing in the prior art, and achieves the technical effect of improving detection efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic flow chart of a method for determining whether the refilling of coolant in a fuel cell system is completed provided by an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the structure of a coolant filling system provided by an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the structure of a device for determining whether the refilling of coolant in a fuel cell system is completed, provided in an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. Some embodiments of the present invention are described in detail below in conjunction with the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0043] The fuel cell system needs to be filled with coolant during factory inspection. Coolant filling involves multiple internal system components (such as coolant pump, pipeline pressure sensor, bypass valve) and external system components (overflow tank and liquid level sensor, injection speed controller). When multiple systems are inspected at the factory, coolant needs to be frequently filled. This process requires manual operation of multiple components according to the situation. The process is as follows: first, the coolant is injected into the overflow tank, and part of the coolant flows into the system pipeline. Turn on the coolant pump. As the gas in the pipeline is discharged, the coolant in the overflow tank continues to flow into the system pipeline. Adjust the bypass valve position and repeat the above operation until the pipeline pressure stabilizes. The coolant filling is completed. Coolant filling is all manual operation and takes a long time.

[0044] Based on this, an embodiment of the present invention provides a method and device for determining whether the refilling of coolant in a fuel cell system is complete, so as to alleviate the technical problems of low judgment accuracy and low efficiency existing in the prior art.

[0045] To facilitate understanding of this embodiment, a method for determining whether the refilling of coolant in a fuel cell system is completed according to an embodiment of the present invention is first described in detail. Figure 1 The flowchart of a method for determining whether the refilling of coolant in a fuel cell system is completed is shown, and mainly includes the following steps S110 to S130:

[0046] S110: using a simulation system to simulate the simultaneous filling of coolant into a plurality of fuel cell systems, and obtaining a current target coolant volume of each fuel cell system;

[0047] This method is applied to the coolant filling system, see Figure 2 As shown in the figure, the coolant filling system includes the internal components of the fuel cell system: overflow tank, liquid level sensor, filling controller, and the external components of the fuel cell system: coolant pump, pipeline pressure sensor, bypass valve. Among them, the coolant pump is responsible for circulating the coolant in the pipeline; the pipeline pressure sensor is responsible for monitoring the pressure; the bypass valve is responsible for controlling the coolant flow through the radiator pipeline; the overflow tank is used as the inlet for the system to fill the coolant; the liquid level sensor is responsible for monitoring the liquid level in the overflow tank; the filling controller is responsible for controlling the switch and the flow into the overflow tank.

[0048] S120: Calculating a confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system;

[0049] S130: Determine whether the actual volume of the added coolant falls within the confidence interval of the coolant volume; if so, the filling is completed.

[0050] In one embodiment, S110 uses a simulation system to simulate the step of simultaneously filling a plurality of fuel cell systems with coolant and obtaining a current target coolant volume of each fuel cell system, including:

[0051] (S111) using a simulation system to simulate the liquid injection controllers in a plurality of coolant filling systems to simultaneously inject coolant into the overflow tank;

[0052] (S112) obtaining the injection speed of each fuel cell system through the injection controller;

[0053] (S113) Based on the injection speed and the filling time, a target coolant volume for each fuel cell system is determined.

[0054] Based on the filling rate and filling time, the calculation formula to determine the target coolant volume for each fuel cell system is:

[0055] Among them, t1 is the filling start time; t2 is the filling end time; v is the filling speed obtained by the filling controller; i represents the i-th fuel cell system.

[0056] In one embodiment, the method further comprises:

[0057] (1) Turning on the coolant pump according to a preset combination of the coolant pump speed and the bypass valve opening value;

[0058] Wherein, the combination of the preset speed of the coolant pump and the opening value of the bypass valve includes: when the opening value of the bypass valve is set to the first opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; when the opening value of the bypass valve is set to the second opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; when the opening value of the bypass valve is set to the third opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; when the opening value of the bypass valve is set to the fourth opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; wherein, the first opening < the second opening < the third opening < the fourth opening; the first speed < the second speed < the third speed;

[0059] As a specific example, the values ​​of the first opening, the second opening, the third opening, and the fourth opening may be 0, 0.3, 0.6, and 0.9, respectively; the values ​​of the first rotational speed, the second rotational speed, and the third rotational speed may be 0.3r, 0.6r, and 0.9r, respectively.

[0060] (2) Using pipeline pressure sensors to obtain pipeline pressures under different combinations;

[0061] (3) The standard deviation of the pipeline pressure is calculated according to the preset sequence of the combination of the above-mentioned preset coolant pump speed and the bypass valve opening value; that is, the preset sequence in the combination is: when the bypass valve opening value is from small to large, the coolant pump speed is from low to high.

[0062] In one embodiment, the step of calculating the standard deviation of the pipeline pressure respectively according to the preset order in the combination includes: using a plurality of first pressure values ​​fed back by the pipeline pressure sensor within a preset time to calculate the standard deviation of the pipeline pressure; the calculation formula is: Among them, P j is the first pressure value; is the average pressure value. That is to say, the pressure sensor feeds back the pressure value to the controller. When the controller receives more than m pressure values ​​fed back by the pressure sensor, it starts to calculate the standard deviation. That is, according to the order of the above 12 combinations, 50 pressure values ​​are obtained for each combination, and the standard deviation is calculated. When σ is less than 5, the coolant filling is completed, the filling is stopped, and the volume calculation starts.

[0063] In one embodiment, the method further includes: using a liquid level sensor to obtain the current liquid level height in the overflow tank in real time, and determining whether the current liquid level height meets a first threshold; if so, suspending the liquid injection, and if not, continuing to add coolant.

[0064] The first threshold value may be 50% of the volume of the overflow tank. That is, the real-time liquid level in the overflow tank is obtained by the liquid level sensor, and if the current liquid level is higher than 50%, the filling of the overflow tank is temporarily stopped, in order to prevent the coolant (or water) in the overflow tank from overflowing during the filling process, and the filling is stopped to give the coolant (or water) time to flow into the pipeline.

[0065] The present invention provides a method for judging whether the refilling of coolant in a fuel cell system is completed, the method comprising: using a simulation system to simulate the refilling of coolant to a plurality of fuel cell systems at the same time, and obtaining the current target coolant volume of each fuel cell system; calculating the confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system; judging whether the actual refilled coolant volume falls within the confidence interval of the coolant volume, and if so, the refilling is completed. The method alleviates the technical problems of low judgment accuracy and low efficiency existing in the prior art, and achieves the technical effect of improving detection efficiency and accuracy.

[0066] As a specific example, this embodiment provides a method for determining whether the refilling of coolant in a fuel cell system is completed, which specifically includes:

[0067] Step (1): Perform filling operation on a total of n fuel cell systems through experiments, and obtain the coolant volume L of the i-th system through the "filling controller" i , where i = 1, 2, ..., n, n ≥ 30; where the "injection controller" controls the injection speed v, t1 is the start time of filling, and t2 is the end time of filling;

[0068] Step (2), calculate the coolant volume L of the n fuel cell system i The confidence interval of the confidence level is set to cl, 80% ≤ cl ≤ 95%, and the confidence interval [L a ,b].

[0069] Step (3) is to fill the fuel cell system with coolant. During the filling process, the "filling controller" is used to obtain the filled volume L, and it is determined in real time whether the filled volume belongs to the above confidence interval L∈[L a ,b], if it belongs to, then the filling is completed.

[0070] Wherein, the experiment described in step (1) further comprises the following steps:

[0071] (S1) The liquid injection controller adds coolant to the overflow tank and determines whether the liquid level is higher than Q% (e.g., 50%); if it is higher than this value, the liquid injection controller temporarily stops injecting liquid; if it is not higher, the liquid injection controller continues to inject liquid into the overflow tank;

[0072] (S2) The rated speed of the coolant pump is r, the bypass valve opening is 0-1, the water pump is turned on and the pipeline pressure P is obtained. The standard deviation σ of the pipeline pressure P is determined in the following order:

[0073] 1. Set the coolant pump speed to 0.3r and the bypass valve opening to 0;

[0074] 2. Set the coolant pump speed to 0.6r and the bypass valve opening to 0;

[0075] 3. Set the coolant pump speed to 0.9r and the bypass valve opening to 0;

[0076] 4. Set the coolant pump speed to 0.3r and the bypass valve opening to 0.3;

[0077] 5. Set the coolant pump speed to 0.6r and the bypass valve opening to 0.3;

[0078] 6. Set the coolant pump speed to 0.9r and the bypass valve opening to 0.3;

[0079] 7. Set the coolant pump speed to 0.3r and the bypass valve opening to 0.6;

[0080] 8. Set the coolant pump speed to 0.6r and the bypass valve opening to 0.6;

[0081] 9. Set the coolant pump speed to 0.9r and the bypass valve opening to 0.6;

[0082] 10. Set the coolant pump speed to 0.3r and the bypass valve opening to 0.9;

[0083] 11. Set the coolant pump speed to 0.6r and the bypass valve opening to 0.9;

[0084] 12. Set the coolant pump speed to 0.9r and the bypass valve opening to 0.9;

[0085] (S3) Calculation method of standard deviation of pressure value P: The sensor feeds back a pressure value P every 10ms j After the controller collects m (recommended value is 50) pressure values, it calculates Calculate the standard deviation σ, When σ is less than 5, the coolant filling is completed. At this time, the coolant volume L of the i-th system is obtained through the "liquid filling controller" i .

[0086] This embodiment is applied to the automatic coolant filling system. Through experiments, the coolant volume L of the fuel cell system is obtained. i The confidence interval is used as the judgment condition for the completion of coolant filling. Compared with the existing technologies such as manual coolant filling, the embodiment of the present application shortens the factory inspection time of the fuel cell system, reduces the error probability, and increases the safety of the system factory inspection.

[0087] In addition, an embodiment of the present invention also provides a device for determining whether the refilling of coolant in a fuel cell system is completed, see Figure 3 As shown, the device comprises:

[0088] A simulation module 310 is used to use a simulation system to simulate the simultaneous filling of coolant into a plurality of fuel cell systems and obtain a current target coolant volume of each fuel cell system;

[0089] The simulation module is also used to calculate a confidence interval of the coolant volume based on the current target coolant volume of each fuel cell system;

[0090] The judgment module 320 is used to judge whether the actual volume of the coolant added belongs to the confidence interval of the coolant volume. If it does, the filling is completed.

[0091] The judgment device for the completion of the refilling of the coolant in the fuel cell system provided in the embodiment of the present application can be specific hardware on the device or software or firmware installed on the device, etc. The implementation principle and technical effect of the device provided in the embodiment of the present application are the same as those of the aforementioned method embodiment. For the sake of brief description, the parts not mentioned in the device embodiment can refer to the corresponding contents in the aforementioned method embodiment. Technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. The judgment device for the completion of the refilling of the coolant in the fuel cell system provided in the embodiment of the present application has the same technical features as the judgment method for the completion of the refilling of the coolant in the fuel cell system provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0092] An embodiment of the present application further provides an electronic device. Specifically, the electronic device includes a processor and a storage device. The storage device stores a computer program, and when the computer program is executed by the processor, it executes the method described in any one of the above-mentioned embodiments.

[0093] Figure 4 A structural schematic diagram of an electronic device provided in an embodiment of the present application, the electronic device 400 includes: a processor 40, a memory 41, a bus 42 and a communication interface 43, wherein the processor 40, the communication interface 43 and the memory 41 are connected via the bus 42; the processor 40 is used to execute an executable module stored in the memory 41, such as a computer program.

[0094] The memory 41 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 43 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0095] The bus 42 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0096] Among them, the memory 41 is used to store programs, and the processor 40 executes the program after receiving the execution instruction. The method executed by the process definition device disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 40 or implemented by the processor 40.

[0097] The processor 40 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 40. The above processor 40 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present invention can be directly embodied as a hardware decoding processor to execute, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 41, and the processor 40 reads the information in the memory 41 and completes the steps of the above method in combination with its hardware.

[0098] Corresponding to the above method, an embodiment of the present application also provides a computer-readable storage medium, which stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to execute the steps of the above method.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0102] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, electronic device, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0103] It should be noted that similar numbers and letters represent similar items in the accompanying drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining whether the refilling of coolant in a fuel cell system is completed, characterized in that: include: Using a simulation system to simulate the simultaneous filling of coolant into a plurality of fuel cell systems, and obtaining a current target coolant volume of each of the fuel cell systems; Calculating a confidence interval of a coolant volume based on the current target coolant volume of each fuel cell system; It is determined whether the actual volume of the added coolant belongs to the confidence interval of the coolant volume. If so, the filling is completed.

2. The method for determining whether the fuel cell system coolant filling is completed according to claim 1, characterized in that: Applied to a coolant filling system, the coolant filling system comprising: an overflow tank, a liquid level sensor, a liquid filling controller, a coolant pump, a pipeline pressure sensor, and a bypass valve; The steps of using a simulation system to simulate the simultaneous filling of coolant into a plurality of fuel cell systems and obtaining a current target coolant volume of each fuel cell system include: Use the simulation system to simulate several coolant filling controllers in the coolant filling system to fill the overflow tank with coolant at the same time; Acquiring the injection speed of each fuel cell system through the injection controller; Based on the injection speed and the injection time, a target coolant volume of each fuel cell system is determined.

3. The method for determining whether the fuel cell system coolant filling is completed according to claim 2, characterized in that: Based on the injection speed and the filling time, the calculation formula for determining the target coolant volume of each fuel cell system is: Among them, t1 is the filling start time; t2 is the filling end time; v is the filling speed obtained by the filling controller; i represents the i-th fuel cell system.

4. The method for determining whether the fuel cell system coolant filling is completed according to claim 2, characterized in that: The method further comprises: Turning on the coolant pump according to a preset combination of the rotation speed of the coolant pump and the opening value of the bypass valve; Using the pipeline pressure sensor to obtain pipeline pressures under different combinations; The standard deviation of the pipeline pressure is calculated respectively according to the preset order in the combination.

5. The method for determining whether the fuel cell system coolant filling is completed according to claim 4, characterized in that: The combination of the preset rotation speed of the coolant pump and the opening value of the bypass valve includes: When the bypass valve is set to the first opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; When the bypass valve is set to the second opening, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; When the bypass valve is set to the third opening degree, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; When the bypass valve is set to the fourth opening degree, the speed of the coolant pump is set to the first speed, the second speed and the third speed respectively; Among them, the first opening degree<the second opening degree<the third opening degree<the fourth opening degree; the first speed<the second speed<the third speed.

6. The method for determining whether the fuel cell system coolant filling is completed according to claim 5, characterized in that: The step of respectively calculating the standard deviation of the pipeline pressure according to the preset order in the combination includes: The standard deviation of the pipeline pressure is calculated using a plurality of first pressure values ​​fed back by the pipeline pressure sensor within a preset time; the calculation formula is: Among them, P j is the first pressure value; is the average pressure value.

7. The method for determining whether the fuel cell system coolant filling is completed according to claim 2, characterized in that: The method further comprises: The liquid level sensor is used to obtain the current liquid level height in the overflow tank in real time, and to determine whether the current liquid level height meets a first threshold; if so, the liquid injection is suspended; if not, the coolant is continued to be added.

8. A device for determining whether the refilling of coolant in a fuel cell system is completed, characterized in that: include: A simulation module, used to simulate the simultaneous filling of coolant into a plurality of fuel cell systems using a simulation system, and obtain a current target coolant volume of each fuel cell system; The simulation module is further used to calculate a confidence interval of a coolant volume based on the current target coolant volume of each fuel cell system; The judgment module is used to judge whether the actual volume of the coolant added belongs to the confidence interval of the coolant volume. If it does, the filling is completed.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to execute the method according to any one of claims 1 to 7.

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