CN110212220B - Fault diagnosis method for hydrogen storage cylinder of fuel cell hydrogen system - Google Patents
Fault diagnosis method for hydrogen storage cylinder of fuel cell hydrogen system Download PDFInfo
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- CN110212220B CN110212220B CN201910460233.2A CN201910460233A CN110212220B CN 110212220 B CN110212220 B CN 110212220B CN 201910460233 A CN201910460233 A CN 201910460233A CN 110212220 B CN110212220 B CN 110212220B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3254—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a flow detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
Abstract
The invention provides a fault diagnosis method for a hydrogen storage cylinder of a fuel cell hydrogen system, which comprises the steps of obtaining the pressure of a pipeline in a pipeline connecting a hydrogen storage component and a hydrogen supply component in the fuel cell hydrogen system and the temperature of each hydrogen storage cylinder; calculating the initial hydrogen mass in each hydrogen storage cylinder according to the pipeline pressure and the temperature of each hydrogen storage cylinder; judging whether the preset fault diagnosis time is reached or not, and if not, accumulating and calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder; if yes, acquiring the current temperature of each hydrogen storage cylinder; calculating theoretical pressure of the pipeline according to the variable quantity of the mass of the hydrogen in each hydrogen storage cylinder, the initial hydrogen mass and the current temperature of each hydrogen storage cylinder; acquiring actual pressure of a pipeline; and performing fault diagnosis processing according to theoretical pressure and actual pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly. The method has the advantages that the fault of the hydrogen storage cylinder can be found in time, the implementation method is simple, and the cost is low.
Description
Technical Field
The invention relates to a fault diagnosis method, in particular to a fault diagnosis method for a hydrogen storage cylinder of a fuel cell hydrogen system.
Background
The hydrogen fuel cell automobile technology is gradually developed and matured, and as a new energy automobile with zero pollution and zero emission, the hydrogen fuel cell automobile has increasingly entered a traffic system and is widely accepted by the public. The fuel cell vehicle takes hydrogen as fuel, chemical energy is efficiently converted into electric energy through a fuel engine so as to drive the vehicle, and pure water is only discharged in the whole process, so that the fuel cell vehicle is an ideal energy-saving environment-friendly zero-emission vehicle for replacing the traditional fossil fuel vehicle in the near future.
The hydrogen system of the fuel cell of the hydrogen fuel cell generally comprises a plurality of hydrogen storage cylinders for storing hydrogen, and a cylinder opening valve is a component which is arranged at the cylinder opening of the hydrogen storage cylinders and controls the connection or disconnection of the gas in the hydrogen cylinders and the outside. During operation of the fuel cell hydrogen system, if the pop-off valve opening function, the hold-on function, or the closing function fails, it is difficult to determine whether the pop-off valve has achieved the target function because the actual pop-off valve opening state is unknown even if the fuel cell hydrogen system receives an external control command and the fuel cell hydrogen system controller performs the relevant operation. For example, the fuel cell hydrogen system receives an external command to perform a startup operation, all hydrogen storage cylinders need to be opened, the fuel cell hydrogen system controller gives a corresponding drive control signal to each hydrogen storage cylinder port valve according to a control logic, and controls the hydrogen storage cylinder port valves to generate an opening action through a drive circuit. If the opening valve of the hydrogen storage cylinder is not opened or the opening valve of the hydrogen storage cylinder is accidentally closed, the pressure between the hydrogen storage cylinders is greatly different, which is very dangerous for a fuel cell hydrogen system.
In the prior art, a fuel cell hydrogen system controller is only integrated with a special drive circuit of a bottleneck valve, and does not have the capabilities of detecting the current in the process of opening the bottleneck valve, maintaining the current in the opening state of the bottleneck valve and closing the bottleneck valve, so that the actual opening and closing state of the bottleneck valve of the hydrogen storage cylinder cannot be judged.
In view of the foregoing, it would be desirable to provide a method for diagnosing a fault in a hydrogen storage cylinder of a fuel cell hydrogen system that overcomes the deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a fault diagnosis method for a hydrogen storage cylinder of a fuel cell hydrogen system, which can overcome the defects of the prior art. The object of the present invention is achieved by the following technical means.
One embodiment of the present invention provides a hydrogen storage cylinder fault diagnosis method of a fuel cell hydrogen system, including a plurality of steps of:
step 1: acquiring the pipeline pressure in a pipeline connecting a hydrogen storage component and a hydrogen supply component in a fuel cell hydrogen system and the temperature of each hydrogen storage cylinder;
step 2: calculating the initial hydrogen mass in each hydrogen storage cylinder according to the pipeline pressure and the temperature of each hydrogen storage cylinder;
and step 3: judging whether the preset fault diagnosis time is reached, if not, executing the step 4; if yes, executing step 5;
and 4, step 4: accumulating and calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder, and then executing the step 3;
and 5: acquiring the current temperature of each hydrogen storage cylinder;
step 6: calculating theoretical pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly according to the variable quantity of the mass of the hydrogen in each hydrogen storage cylinder, the initial hydrogen mass and the current temperature of each hydrogen storage cylinder;
and 7: acquiring the actual pressure of a pipeline currently connecting the hydrogen storage assembly and the hydrogen supply assembly;
and 8: and performing fault diagnosis processing according to theoretical pressure and actual pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly.
According to the method for diagnosing the fault of the hydrogen storage cylinder provided by the above-mentioned one embodiment of the present invention, the step 4 of calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder cumulatively includes calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder by integrating the hydrogen flow measured by the flow meter at the opening of each hydrogen storage cylinder.
According to the method for diagnosing the fault of the hydrogen storage cylinder provided by the above embodiment of the present invention, the step 4 of calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder in an accumulated manner further includes obtaining the hydrogen flow rate flowing through the controllable component in unit time by calculating or looking up a table by measuring the front-end hydrogen pressure, the rear-end hydrogen pressure, the control signal, the gas temperature and the component temperature of the controllable airflow device on the pipeline connecting the hydrogen storage component and the hydrogen supply component, and then obtaining the variation of the mass of the hydrogen in the hydrogen storage cylinder by hydrogen flow integral calculation.
According to the method for diagnosing the fault of the hydrogen storage cylinder provided by the above one embodiment of the present invention, the step 8 of performing the fault diagnosis process based on the theoretical pressure and the actual pressure of the pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly includes:
step 801: obtaining a pressure difference value according to the theoretical pressure and the actual pressure;
step 802: judging whether the pressure difference value is larger than a preset first threshold value, if so, executing a step 803;
step 803: the first type of fault is reported and fault-related data is recorded.
According to the fault diagnosis method for the hydrogen storage cylinder provided by the above embodiment of the invention, step 802 judges whether the pressure difference is larger than a preset first threshold value, if "no", step 804 is executed;
step 804: judging whether the pressure difference value is larger than a preset second threshold value, if so, executing a step 805; if not, executing the step 1.
Step 805: reporting the second type of fault and recording fault related data.
According to the hydrogen storage cylinder failure diagnosis method provided by the above-mentioned one embodiment of the present invention, the first threshold value is larger than the second threshold value.
The failure diagnosis method for the hydrogen storage cylinder provided by the embodiment of the invention comprises a hydrogen supply component, a hydrogen storage component, a hydrogen injection component and a detection component, first pipeline and second pipeline, the hydrogen storage subassembly includes a plurality of hydrogen storage cylinders and a plurality of bottleneck valve, the detection subassembly includes the barometer, a plurality of thermometers, first flowmeter and second flowmeter, all be equipped with the thermometer on every hydrogen storage cylinder, the bottleneck of every hydrogen storage cylinder all is equipped with the bottleneck valve, annotate the hydrogen subassembly through first pipeline respectively with supply hydrogen subassembly and a plurality of bottleneck valve intercommunication of hydrogen storage subassembly, the hydrogen supply subassembly passes through second pipeline and outside fuel cell engine intercommunication, the barometer sets up on first pipeline, first flowmeter sets up the junction at second pipeline and outside fuel cell engine, the second flowmeter sets up the junction at first pipeline and notes hydrogen subassembly.
The method for diagnosing the fault of the hydrogen storage cylinder has the advantages that: whether the hydrogen storage cylinder has a fault is judged according to the pressure, the temperature and the hydrogen flow in the hydrogen system of the fuel cell, and the implementation method is simple; the cost is low, and the fault diagnosis of the initial hydrogen storage cylinder can be realized without using a current sampling circuit with higher price; makes up the hardware function deficiency of the fuel cell hydrogen system controller, and ensures the operation safety of the fuel cell hydrogen system.
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The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 shows a block diagram of a fuel cell hydrogen system according to an embodiment of the invention;
fig. 2 shows a flowchart of a hydrogen storage cylinder failure diagnosis method of a fuel cell hydrogen system according to an embodiment of the invention as shown in fig. 1.
Detailed Description
Fig. 1-2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Fig. 1 shows a block diagram of a fuel cell hydrogen system according to an embodiment of the invention. As shown in fig. 1, the fuel cell hydrogen system comprises a hydrogen supply component A, a hydrogen storage component B and a hydrogen injection component C, detection module (not shown), first pipeline E and second pipeline F, hydrogen storage module B includes a plurality of hydrogen storage gas cylinders B1 and a plurality of bottleneck valve B2, detection module includes barometer (not shown) and a plurality of thermometer (not shown), all be equipped with the thermometer on every hydrogen storage gas cylinder B1, the bottleneck of every hydrogen storage gas cylinder B1 all is equipped with bottleneck valve B2, annotate hydrogen subassembly C and communicate with a plurality of bottleneck valves B2 of hydrogen supply subassembly A and hydrogen storage module B respectively through first pipeline E, hydrogen supply subassembly A communicates through second pipeline F and outside fuel cell engine D, the barometer sets up on first pipeline E, first flowmeter sets up in the junction of second pipeline F and outside fuel cell engine D, the second flowmeter sets up in the junction of first pipeline E and hydrogen injection subassembly C. The first pipeline E is a pipeline for connecting the hydrogen storage component and the hydrogen supply component.
Fig. 2 shows a flowchart of a hydrogen storage cylinder failure diagnosis method of a fuel cell hydrogen system according to an embodiment of the invention as shown in fig. 1. As shown in fig. 2, the hydrogen storage cylinder fault diagnosis method includes a plurality of steps:
step 1: acquiring the pipeline pressure P1 in a first pipeline connecting a hydrogen storage component and a hydrogen supply component in a fuel cell hydrogen system and the temperature t of each hydrogen storage cylinder1、t2…tn；
Step 2: according to the line pressure P1 and the temperature t of each hydrogen storage cylinder1、t2…tnCalculating the initial hydrogen mass in each hydrogen storage cylinder; the calculation of the initial hydrogen mass m in the nth hydrogen storage cylindernThe formula is as follows:
mn＝P1*V*MH2/(R*tn*Cof)
wherein V is the volume of hydrogen that the hydrogen storage cylinder is capable of storing, MH2Is the molar mass of hydrogen gas that can be stored in the hydrogen storage cylinder, R is a common gas constant, Cof is a predetermined correction coefficient reflecting the temperature-pressure correspondence, and the value of Cof is related to P1 and tnAnd (4) correlating.
And step 3: judging whether the preset fault diagnosis time is reached, if not, executing the step 4; if yes, executing step 5;
and 4, step 4: the variation m of the mass of the hydrogen in the hydrogen storage cylinder is calculated in an accumulated mannertThen, step 3 is executed;
and 5: obtaining the current temperature T of each hydrogen storage cylinder1,T2…Tn；
Step 6: variation m according to the mass of hydrogen in each hydrogen storage cylindertInitial hydrogen mass m1,m2…mnAnd the current temperature T of each hydrogen storage cylinder1,T2…TnCalculating and connecting hydrogen storage componentAnd a theoretical pressure Pref of the first line of the hydrogen supply assembly;
Pref＝(m1+m2+…mn-mt)/(V*MH2/(R*T1*Cof1)+V*MH2/(R*T2*Cof2)+…V*MH2/(R*Tn*Cofn))
wherein Cof1,Cof2…CofnIs a predetermined correction coefficient, Cof, reflecting the temperature and pressure correspondence1,Cof2…CofnAnd Pref and T1,T2…TnCorrelation, calculating by mathematical analysis the Cof that holds the above formula1,Cof2…CofnAnd Pref, the mathematical analysis methods include Newton's steepest descent method, or dichotomy, etc.
And 7: acquiring actual pressure Pact of a first pipeline which is currently connected with the hydrogen storage assembly and the hydrogen supply assembly;
and 8: and performing fault diagnosis processing according to the theoretical pressure Pref and the actual pressure Pact of the first pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly, and then finishing the processing.
According to the method for diagnosing the failure of the hydrogen storage cylinder provided by the above-mentioned one embodiment of the present invention, the step 4 of calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder cumulatively includes calculating the variation m of the mass of the hydrogen in the hydrogen storage cylinder by integrating the hydrogen flow q (t) measured by the flow meter at the opening of each hydrogen storage cylindertAnd calculating the integral to obtain the variation m of the mass of the hydrogen in the hydrogen storage cylindertThe formula of (1) is:
where t is the measurement time.
According to the method for diagnosing the failure of the hydrogen storage cylinder provided by one embodiment of the present invention, the step 4 of calculating the variation of the mass of the hydrogen gas in the hydrogen storage cylinder by integrating the variation of the mass of the hydrogen gas further comprises measuring a first pipeline connecting the hydrogen storage assembly and the hydrogen supply assemblyThe hydrogen flow Q (t) flowing through the controllable parts in unit time is obtained by calculating or looking up the table according to the front-end hydrogen pressure, the rear-end hydrogen pressure, the control signal, the gas temperature and the part temperature of the controllable airflow device, and then the variation m of the mass of the hydrogen in the hydrogen storage bottle is obtained by hydrogen flow integral calculationt. The table lookup refers to the comparison relationship between the front-end hydrogen pressure, the rear-end hydrogen pressure, the control signal, the gas temperature and the temperature of the parts of the controllable airflow device and the hydrogen flow rate obtained through a large amount of experimental measurement data. The calculation means that the comparison relationship between the front-end hydrogen pressure, the rear-end hydrogen pressure, the control signal, the gas temperature and the temperature of the parts of the controllable gas flow device and the hydrogen flow is obtained in a mode of combining experimental data and/or fluid analysis software calculation, and the hydrogen flow is obtained through the calculation of the mathematical formula. The integral calculation is carried out to obtain the variation m of the mass of the hydrogen in the hydrogen storage cylindertThe formula of (1) is:
where t is the measurement time.
According to the method for diagnosing the fault of the hydrogen storage cylinder provided by the above one embodiment of the present invention, the step 8 of performing the fault diagnosis process based on the theoretical pressure and the actual pressure of the first pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly includes:
step 801: obtaining a pressure difference value P (i.e. | Pref-Pact |) according to the theoretical pressure Pref and the actual pressure Pact;
step 802: judging whether the pressure difference value P is larger than a preset first threshold value, if so, executing a step 803;
step 803: the first type of fault is reported and fault-related data is recorded.
According to the method for diagnosing the fault of the hydrogen storage cylinder provided by the above embodiment of the present invention, step 802 determines whether the pressure difference P is greater than a preset first threshold, if "no", step 804 is executed;
step 804: judging whether the pressure difference value P is larger than a preset second threshold value, if so, executing step 805; if not, executing the step 1.
Step 805: reporting the second type of fault and recording fault related data.
According to the hydrogen storage cylinder failure diagnosis method provided by the above-mentioned one embodiment of the present invention, the first threshold value is larger than the second threshold value.
The method for diagnosing the fault of the hydrogen storage cylinder has the advantages that: whether the hydrogen storage cylinder has a fault is judged according to the pressure, the temperature and the hydrogen flow in the hydrogen system of the fuel cell, and the implementation method is simple; the cost is low, and the fault diagnosis of the initial hydrogen storage cylinder can be realized without using a current sampling circuit with higher price; makes up the hardware function deficiency of the fuel cell hydrogen system controller, and ensures the operation safety of the fuel cell hydrogen system.
It will of course be realised that whilst the foregoing has been given by way of illustrative example of this invention, all such and other modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope and ambit of this invention as is herein set forth. Therefore, while this invention has been described with reference to preferred embodiments, it is not intended that the novel apparatus be limited thereby, but on the contrary, it is intended to cover various modifications and equivalent arrangements included within the broad scope of the above disclosure and the appended claims.
Claims (5)
1. A fault diagnosis method for a hydrogen storage cylinder of a fuel cell hydrogen system is characterized by comprising the following steps:
step 1: acquiring the pipeline pressure in a pipeline connecting a hydrogen storage component and a hydrogen supply component in a fuel cell hydrogen system and the temperature of each hydrogen storage cylinder;
step 2: calculating the initial hydrogen mass in each hydrogen storage cylinder according to the pipeline pressure and the temperature of each hydrogen storage cylinder;
and step 3: judging whether the preset fault diagnosis time is reached, if not, executing the step 4; if yes, executing step 5;
and 4, step 4: accumulating and calculating the variation of the mass of the hydrogen in the hydrogen storage cylinder, and then executing the step 3;
and 5: acquiring the current temperature of each hydrogen storage cylinder;
step 6: calculating theoretical pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly according to the variable quantity of the mass of the hydrogen in each hydrogen storage cylinder, the initial hydrogen mass and the current temperature of each hydrogen storage cylinder;
and 7: acquiring the actual pressure of a pipeline currently connecting the hydrogen storage assembly and the hydrogen supply assembly;
and 8: performing fault diagnosis processing according to theoretical pressure and actual pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly;
step 8, performing fault diagnosis processing according to theoretical pressure and actual pressure of a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly comprises:
step 801: obtaining a pressure difference value according to the theoretical pressure and the actual pressure;
step 802: judging whether the pressure difference value is larger than a preset first threshold value, if so, executing a step 803;
step 803: reporting the first type of fault and recording fault related data;
further, step 802 determines whether the pressure difference is greater than a preset first threshold, and if "no", step 804 is executed;
step 804: judging whether the pressure difference value is larger than a preset second threshold value, if so, executing a step 805; if not, executing the step 1;
step 805: reporting the second type of fault and recording fault related data.
2. The method for diagnosing a malfunction of a hydrogen storage cylinder of a fuel cell hydrogen system as claimed in claim 1, wherein said step 4 of cumulatively calculating the variation in the mass of hydrogen gas in the hydrogen storage cylinder includes calculating the variation in the mass of hydrogen gas in the hydrogen storage cylinder by integrating the hydrogen gas flow rate measured at a flow meter at the mouth of each hydrogen storage cylinder.
3. The method for diagnosing a malfunction of a hydrogen storage cylinder in a fuel cell hydrogen system as claimed in claim 1, wherein the step 4 of calculating the variation of the mass of hydrogen in the hydrogen storage cylinder by accumulation further comprises obtaining the hydrogen flow rate flowing through the controllable gas flow device per unit time by calculation or table lookup by measuring the front-end hydrogen pressure, the rear-end hydrogen pressure, the control signal, the gas temperature, and the component temperature of the controllable gas flow device on a pipeline connecting the hydrogen storage assembly and the hydrogen supply assembly, and then obtaining the variation of the mass of hydrogen in the hydrogen storage cylinder by hydrogen flow integral calculation.
4. The hydrogen storage cylinder failure diagnosis method for a fuel cell hydrogen system as claimed in claim 1, wherein the first threshold value is larger than the second threshold value.
5. The hydrogen storage cylinder fault diagnosis method of the fuel cell hydrogen system as claimed in any one of claims 1 to 4, wherein the fuel cell hydrogen system comprises a hydrogen supply assembly, a hydrogen storage assembly, a hydrogen injection assembly, a detection assembly, a first pipeline and a second pipeline, the hydrogen storage assembly comprises a plurality of hydrogen storage cylinders and a plurality of cylinder port valves, the detection assembly comprises a barometer, a plurality of thermometers, a first flow meter and a second flow meter, each hydrogen storage cylinder is provided with a thermometer, a cylinder port of each hydrogen storage cylinder is provided with a cylinder port valve, the hydrogen injection assembly is respectively communicated with the hydrogen supply assembly and the plurality of cylinder port valves of the hydrogen storage assembly through the first pipeline, the hydrogen supply assembly is communicated with an external fuel cell engine through the second pipeline, the barometer is arranged on the first pipeline, the first flow meter is arranged at the connection of the second pipeline and the external fuel cell engine, the second flowmeter is arranged at the joint of the first pipeline and the hydrogen injection assembly.
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