CN112054230B - Fault diagnosis method and system for hydrogen fuel cell drainage and exhaust device - Google Patents

Fault diagnosis method and system for hydrogen fuel cell drainage and exhaust device Download PDF

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CN112054230B
CN112054230B CN202010964398.6A CN202010964398A CN112054230B CN 112054230 B CN112054230 B CN 112054230B CN 202010964398 A CN202010964398 A CN 202010964398A CN 112054230 B CN112054230 B CN 112054230B
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hydrogen
map
flow
parameters
spraying
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CN112054230A (en
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郭伟静
刘玉满
马原蔚
谢晓荷
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Shanghai Fuel Cell Vehicle Powertrain Co ltd
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Shanghai Fuel Cell Vehicle Powertrain Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04305—Modeling, demonstration models of fuel cells, e.g. for training purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04388—Pressure; Ambient pressure; Flow of anode reactants at the inlet or inside the fuel cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0438—Pressure; Ambient pressure; Flow
    • H01M8/04402—Pressure; Ambient pressure; Flow of anode exhausts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04589—Current of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04664—Failure or abnormal function
    • H01M8/04679—Failure or abnormal function of fuel cell stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention discloses a fault diagnosis method for a hydrogen fuel cell drainage and exhaust device, which comprises the following steps: constructing a MAP graph; collecting hydrogen spraying parameters; the hydrogen injection parameters include hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spraying duty ratio and electric pile output current I; searching the MAP according to the hydrogen spraying parameters to obtain the standard flow Q0(ii) a Obtaining actual consumption flow Q according to electric pile output current I1(ii) a Judging standard flow Q0Whether or not it is larger than the actual consumption flow Q1If so, the output hydrogen discharge valve is in a normal state, otherwise, the output hydrogen discharge valve is in an abnormal state. By adopting the technical scheme, early warning can be realized in time before flooding occurs, the trouble is prevented, and the damage to the hydrogen fuel cell caused by frequent flooding is avoided; by adjusting the hydrogen injection duty ratio, the MAP is quickly constructed, the construction and use cost is lower, and the deployment speed is higher; the real relation between the standard flow and the actual consumption flow is judged more accurately, and the judgment accuracy is further improved.

Description

Fault diagnosis method and system for hydrogen fuel cell drainage and exhaust device
Technical Field
The present invention relates to a hydrogen fuel cell system, and more particularly, to a method and a system for diagnosing a fault of a hydrogen fuel cell water discharge and gas exhaust apparatus.
Background
In recent years, under the large background of global response to energy conservation and emission reduction and clean energy use, the main countries and regions pay more and more attention to the development and utilization of hydrogen energy, the hydrogen energy is gradually listed into related development strategies and industrial policies, and the fuel cell automobile industry has attracted great attention as a main carrier of the fuel cell automobile industry.
The fuel cell hydrogen module main components include: a hydrogen supply system, a hydrogen return system, a water discharge and exhaust system, and the like; the water drainage and gas exhaust device is mainly used for discharging redundant N2 and liquid water in the reactor, and simultaneously part of water vapor and hydrogen are also attached; as an execution component in the fuel cell, a controller directly sends a driving signal for regulation and control, and the fuel cell has no signal feedback function, so that the fault of the fuel cell in the system operation cannot be monitored in real time.
In the conventional technology, whether a component has a fault is generally judged through the performance change of a galvanic pile, and for a drainage and exhaust device, the fault of the drainage and exhaust device can be judged only when the performance of the galvanic pile has the fault, and when a flooding phenomenon occurs, the performance of the galvanic pile fluctuates due to flooding, so that the fault of the drainage and exhaust device is judged.
Disclosure of Invention
In order to solve the technical problem that the fault of the water and gas discharging device can be judged only after the flooding phenomenon occurs in the prior art, namely, the fault diagnosis method for the water and gas discharging device of the hydrogen fuel cell can only solve the technical problem that the fault can not be prevented in advance, the invention provides a fault diagnosis method for the water and gas discharging device of the hydrogen fuel cell, which comprises the following steps:
constructing a MAP graph; collecting hydrogen spraying parameters; the hydrogen injection parameters comprise hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spraying duty ratio and electric pile output current I;
searching the MAP according to the hydrogen injection parameters to obtain standard flow Q0；
Obtaining actual consumption flow Q according to the electric pile output current I1；
And judging whether the standard flow Q0 is greater than the actual consumption flow Q1, if so, outputting a normal hydrogen discharge valve, and otherwise, outputting an abnormal hydrogen discharge valve.
According to the technical scheme, the hydrogen spraying parameters are used for carrying out MAP table lookup, and comparison between theoretical hydrogen consumption and actual hydrogen consumption is simply and rapidly achieved, so that whether excessive water is generated in the power generation process of the electric pile or not and whether a water flooding phenomenon occurs or not is judged, and compared with the traditional technical scheme that the performance of the electric pile is damaged after the water flooding occurs, whether the water flooding occurs or not is judged through the performance of the electric pile, namely the water flooding phenomenon is treated in the prior art, early warning can be timely carried out before the water flooding occurs, the trouble is prevented, and damage to the hydrogen fuel cell caused by frequent water flooding phenomenon is avoided.
Preferably, the constructing the MAP includes: collecting MAP graph construction parameters; the MAP graph construction parameters comprise hydrogen jet inlet pressure P0, hydrogen jet outlet pressure P1, hydrogen jet duty ratio and flow Q;
continuously acquiring the MAP construction parameters after adjusting the hydrogen injection duty ratio;
and constructing the MAP according to the MAP construction parameters.
In the preferred technical scheme, the hydrogen injection duty ratio is set to the corresponding gear according to the gear of the power control, so that a corresponding MAP graph is constructed, and the construction of the MAP graph for each gear is realized.
Further preferably, the MAP construction parameters further include: MAP graph hydrogen jet inlet temperature T0；
The hydrogen injection parameters further comprise actual hydrogen injection inlet temperature T1。
Further preferably, the method further comprises the following steps:
judging the actual hydrogen jet inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0And if not, carrying out flow correction.
Further preferably, the flow correction includes:
order to
Figure GDA0003362353130000031
In a further preferred embodiment, the standard flow rate Q is determined by0Against the gas at different temperaturesThe volume is different, and the flow consumed by the same power can be different, so that the technical problem of certain error can be caused in the actual calculation process, and the standard flow Q can be more accurately judged0And actual consumption flow rate Q1The accuracy of judgment is further improved.
The present invention also provides a fault diagnosis system for a hydrogen fuel cell water discharge and gas exhaust apparatus, including: a drainage device; the water discharging device comprises a hydrogen discharging valve;
the hydrogen spraying parameter acquisition module is used for acquiring hydrogen spraying parameters and transmitting the hydrogen spraying parameters to the control module; the hydrogen spraying parameter acquisition module comprises:
a hydrogen jet inlet pressure sensor for measuring the pressure P of the hydrogen jet inlet0；
A hydrogen ejection port pressure sensor for measuring the hydrogen ejection port pressure P1；
A hydrogen spray duty ratio sensor for measuring hydrogen spray duty ratio
The galvanic pile output current meter is used for measuring the galvanic pile output current I;
the MAP module is used for storing the MAP and searching the MAP according to the hydrogen injection parameters to obtain the standard flow Q0；
An actual flow calculation module for obtaining actual consumption flow Q according to the electric pile output current I1；
A state output module for judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1If so, the output hydrogen discharge valve is in a normal state, otherwise, the output hydrogen discharge valve is in an abnormal state.
Further preferably, the hydrogen injection parameter collecting module further includes: the flowmeter is used for acquiring the flow Q;
the hydrogen injection parameter acquisition module is also used for acquiring the MAP construction parameters;
further comprising: and the MAP graph constructing module is used for constructing a MAP graph according to the MAP graph constructing parameters and transmitting the MAP graph to the MAP graph module.
Further preferably, the hydrogen injection system further comprises a hydrogen injection duty ratio adjusting module, wherein the hydrogen injection duty ratio adjusting module is used for adjusting the hydrogen injection duty ratio to match the hydrogen injection parameter collecting module to collect the MAP construction parameters.
Further preferably, the hydrogen spray parameter acquisition module further comprises a thermometer, and the thermometer is used for acquiring the actual hydrogen spray inlet temperature T1And MAP graph hydrogen injection inlet temperature T0。
Further preferably, the system further comprises a flow correction module for judging the actual hydrogen injection inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0And if not, carrying out flow correction.
The invention at least comprises the following technical effects:
1. compared with the traditional method that the performance of the galvanic pile is damaged after the occurrence of the flooding, the method judges whether the flooding occurs really or not through the performance of the galvanic pile by comparing the actual flow with the standard flow, namely, the method is processed in the prior technical scheme, can give an early warning in time before the occurrence of the flooding, prevents the flooding from happening in the future and avoids the damage to the hydrogen fuel cell caused by the frequent occurrence of the flooding;
2. by adjusting the hydrogen injection duty ratio, the MAP is quickly constructed, and compared with the method of modeling by using machine learning and the like, the construction and use cost is lower and the deployment speed is higher in the embodiment;
3. the real relation between the standard flow and the actual consumed flow is judged more accurately by correcting the influence of the temperature change on the flow data, and the judgment accuracy is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic flow chart of example 1 of the present invention;
FIG. 2 is a schematic flow chart of example 3 of the present invention;
FIG. 3 is a schematic structural diagram of embodiment 4 of the present invention;
FIG. 4 is a schematic structural view of example 6 of the present invention;
FIG. 5 is a PID MAP when MAP MAPs are constructed according to embodiments 3 and 6 of the present invention;
fig. 6 is a MAP illustration.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically depicted, or only one of them is labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
as shown in fig. 1, 6, the present embodiment discloses a failure diagnosis method for a hydrogen fuel cell drain exhaust apparatus, including:
s0: constructing a MAP graph;
s1: collecting hydrogen spraying parameters; the hydrogen injection parameters comprise hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spraying duty ratio and electric pile output current I; hydrogen spraying, namely a hydrogen supply device;
s2: searching the MAP according to the hydrogen injection parameters to obtain standard flow Q0；
S4: obtaining actual consumption flow Q according to the electric pile output current I1；
S5: judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1If so, the process proceeds to S5-1, otherwise, the process proceeds to S5-2.
S5-1: the output hydrogen discharge valve is in a normal state;
s5-2: the output hydrogen discharge valve is abnormal in state.
In this embodiment, a MAP is first constructed; collecting hydrogen spraying parameters to judge the current hydrogen spraying condition through the pressure P of the hydrogen spraying inlet0Hydrogen discharge port pressure P1Ratio of (i.e. P)0/P1Inquiring the hydrogen injection duty ratio in the MAP graph to obtain the theoretical flow predicted by the MAP graph, namely the standard flow Q0I.e. what the flow rate is under a completely normal condition, and since the voltage of the battery is constant, the work output by the stack can be calculated by the stack output current I,the energy conversion rate of the battery is known, so that the actual consumption flow Q of the hydrogen generated by the electricity generation of the electric pile is calculated1If Q is1Greater than or equal to Q0The water flooding phenomenon can be caused if the water generated in the power generation process of the electric pile is not discharged in time, otherwise, the water flooding phenomenon can not be caused.
In the embodiment, the theoretical hydrogen consumption and the actual hydrogen consumption are simply and rapidly compared by using the hydrogen spraying parameters to look up the MAP, so that whether excessive water is generated in the power generation process of the pile and whether the pile is flooded or not is judged.
Example 2:
the embodiment comprises the following steps:
s0-1: collecting MAP graph construction parameters; the MAP graph construction parameters comprise hydrogen jet inlet pressure P0, hydrogen jet outlet pressure P1, hydrogen jet duty ratio and flow Q;
s0-2: judging whether the hydrogen spraying duty ratio reaches an adjusting end point, if so, entering S0-4, otherwise, entering S0-3;
s0-3: adjusting the hydrogen injection duty cycle and returning to S0-1;
s0-4: constructing the MAP according to the MAP construction parameters;
s1: collecting hydrogen spraying parameters; the hydrogen injection parameters comprise hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spraying duty ratio and electric pile output current I;
s2: searching the MAP according to the hydrogen injection parameters to obtain standard flow Q0；
S4: obtaining actual consumption flow Q according to the electric pile output current I1；
S5: judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1If yes, go to S5-1, otherwiseThe process proceeds to S5-2.
S5-1: the output hydrogen discharge valve is in a normal state;
s5-2: the output hydrogen discharge valve is abnormal in state.
In this embodiment, before an actual operation is performed, a MAP is first constructed, generally using a intact battery, in which case, since the hydrogen discharge valve is in a normal operating state, the MAP is actually constructed in such a manner that, when the hydrogen discharge valve is in a normal operating state, the pressure ratio varies with the flow rate Q and the hydrogen injection duty ratio, and in a search process, the hydrogen injection duty ratio is continuously adjusted to determine the variation of the pressure ratio under different hydrogen injection duty ratios, generally speaking, corresponding to a power control gear, the hydrogen injection duty ratio can be respectively adjusted to 5%, 10%, 15%, and 20% >. 100%, and then the flow rate is adjusted from 0 to full flow rate under different hydrogen injection duty ratios, so as to draw a corresponding MAP, that is a MAP having a plurality of curves, each curve representing different hydrogen injection duty ratios, the abscissa is the flow and the ordinate is P0/P1。
In the actual operation process, if the hydrogen spraying duty ratio is 5 percent, according to P0/P1To find the corresponding flow, i.e. Q, in reverse0，Q0Essentially reflects the consumption of hydrogen and the sum of water vapor and nitrogen discharged through a hydrogen discharge valve, and then compares Q0And Q1If Q is0If the value is relatively large, the hydrogen discharge valve works normally, and water vapor, nitrogen and the like which should be discharged are discharged, and if Q is greater than Q, the hydrogen discharge valve works normally1Is relatively large or of Q0And if the two phases are equal, the hydrogen discharge valve is abnormal in work, and the water vapor and the nitrogen which should be discharged are not completely discharged, so that whether the hydrogen discharge valve works normally or not is judged, and whether the flooding risk exists or not is judged.
For the same type of products, the method can be suitable for all produced products only through once construction process, meanwhile, for the sake of insurance, MAP construction is performed once every time one product is produced, and compared with the method of modeling by using means such as machine learning, the method is lower in construction and use cost and higher in deployment speed.
Example 3:
as shown in fig. 2, 5, and 6, the present embodiment includes:
s0-1: collecting MAP graph construction parameters; the MAP graph construction parameters comprise hydrogen injection inlet pressure P0, hydrogen outlet pressure P1, hydrogen injection duty ratio and flow Q, MAP graph hydrogen injection inlet temperature T0；
S0-2: judging whether the hydrogen spraying duty ratio reaches an adjusting end point, if so, entering S0-4, otherwise, entering S0-3;
s0-3: adjusting the hydrogen injection duty cycle and returning to S0-1;
s0-4: constructing the MAP according to the MAP construction parameters;
s1: collecting hydrogen spraying parameters; the hydrogen injection parameters comprise hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spray duty cycle, stack output current I, actual hydrogen spray inlet temperature T1；
S2: searching the MAP according to the hydrogen injection parameters to obtain standard flow Q0；
S3: judging the actual hydrogen jet inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0If not, the process goes to S3-1;
s3-1: computing
Figure GDA0003362353130000081
Putting Q' into0Is assigned to Q0；
S4: obtaining actual consumption flow Q according to the electric pile output current I1；
S5: judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1The process proceeds to S5-1, otherwise, the process proceeds to S5-2.
S5-1: the output hydrogen discharge valve is in a normal state;
s5-2: the output hydrogen discharge valve is abnormal in state.
In this embodiment, the temperatures during the MAP construction and during actual use are not exactly the same, but are known to be differentIn the case of different gas volumes, the consumed flow rates of the same power are different, which results in certain errors in the actual calculation process, for example, the MAP is constructed at 273K, and the MAP is operated at 293K, so that in the case of the same power operation, the flow rate Q at 273K is determined0Flow rate Q of certain ratio 293K1In the case of a small flow rate, if the flow rate is calculated as 273K, an error inevitably occurs, and therefore, the error needs to be corrected to obtain the standard flow rate at 293K, and the standard flow rate Q can be determined more accurately0And actual consumption flow rate Q1The accuracy of judgment is further improved.
Example 4:
as shown in fig. 3, 6, the present embodiment provides a failure diagnosis system for a hydrogen fuel cell drain exhaust apparatus, including: a drainage device; the water discharging device comprises a hydrogen discharging valve;
the hydrogen injection parameter acquisition module is used for constructing an MAP (MAP); collecting hydrogen spraying parameters and transmitting the hydrogen spraying parameters to the control module; the hydrogen spraying parameter acquisition module comprises:
a hydrogen jet inlet pressure sensor for measuring the pressure P of the hydrogen jet inlet0；
A hydrogen ejection port pressure sensor for measuring the hydrogen ejection port pressure P1；
A hydrogen spray duty ratio sensor for measuring hydrogen spray duty ratio
The galvanic pile output current meter is used for measuring the galvanic pile output current I;
the MAP module is used for storing the MAP and searching the MAP according to the hydrogen injection parameters to obtain the standard flow Q0；
An actual flow calculation module for obtaining actual consumption flow Q according to the electric pile output current I1；
A state output module for judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1If so, the output hydrogen discharge valve is in a normal state, otherwise, the output hydrogen discharge valve is in an abnormal state.
In this embodiment, a MAP is first constructed; collecting hydrogen spraying parameters to judge the current hydrogen spraying condition through the pressure P of the hydrogen spraying inlet0Hydrogen discharge port pressure P1Ratio of (i.e. P)0/P1And the hydrogen spraying duty ratio is inquired in the MAP graph to obtain the theoretical flow predicted by the MAP graph, namely the flow under the completely normal condition, and meanwhile, because the voltage of the battery is constant, the work output by the pile can be calculated through the pile output current I, and the energy conversion rate of the battery is known, so that the actual consumption flow Q of the hydrogen generated by the pile power generation is calculated1If Q is1Greater than or equal to Q0The water flooding phenomenon can be caused if the water generated in the power generation process of the electric pile is not discharged in time, otherwise, the water flooding phenomenon can not be caused.
In the embodiment, the theoretical hydrogen consumption and the actual hydrogen consumption are simply and rapidly compared by using the hydrogen spraying parameters to look up the MAP, so that whether excessive water is generated in the power generation process of the pile and whether the pile is flooded or not is judged.
Example 5:
in this embodiment, based on embodiment 4, the hydrogen injection parameter collecting module further includes: the flowmeter is used for acquiring the flow Q;
the hydrogen injection parameter acquisition module is also used for acquiring the MAP construction parameters;
further comprising: the MAP graph building module is used for building a MAP graph according to MAP graph building parameters and transmitting the MAP graph to the MAP graph module;
the hydrogen spraying duty ratio adjusting module is used for adjusting the hydrogen spraying duty ratio to match the hydrogen spraying parameter collecting module to collect the MAP construction parameters.
This implementationIn the example, before the actual operation, firstly, a MAP is constructed, generally, a intact battery is used for construction, in this case, since the hydrogen discharge valve is in a normal working state, the MAP is actually constructed in such a way that the pressure ratio is changed along with the flow Q and the hydrogen-air duty ratio under the condition that the hydrogen discharge valve normally works, in the searching process, the hydrogen injection duty ratio is continuously adjusted to judge the change condition of the pressure ratio under the condition of different hydrogen injection duty ratios, generally, the hydrogen injection duty ratios are respectively adjusted to 5%, 10%, 15% and 20% >. to.100%, then the flow is adjusted from 0 to the full flow under the condition of different hydrogen injection duty ratios, so as to draw a corresponding MAP, namely, a MAP with a plurality of curves, each curve represents different hydrogen injection duty ratios, the horizontal coordinate is the flow, ordinate is P0/P1。
In the actual operation process, if the hydrogen spraying duty ratio is 5 percent, according to P0/P1To find the corresponding flow, i.e. Q, in reverse0Then compare Q0And Q1If Q is0If the value is relatively large, the hydrogen discharge valve works normally, and water vapor, nitrogen and the like which should be discharged are discharged, and if Q is greater than Q, the hydrogen discharge valve works normally1If the pressure is relatively large, the hydrogen discharge valve is not operated normally, and the water vapor and the nitrogen gas which should be discharged are not completely discharged.
Example 6:
as shown in fig. 4, 5 and 6, in this embodiment based on embodiment 5, the hydrogen spray parameter collecting module further includes a thermometer, and the thermometer is configured to collect an actual hydrogen spray inlet temperature T1And MAP graph hydrogen injection inlet temperature T0；
The device also comprises a flow correction module for judging the actual hydrogen jet inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0If not, flow correction is carried out; the flow correction is based on a formula
Figure GDA0003362353130000111
Putting Q' into0Is assigned to Q0。
In the present embodiment, the first and second electrodes are,the temperatures in the MAP construction process and the actual use process are not completely the same, but it is known that, under different temperatures, the volumes of gases are different, and the flow rates consumed by the same power are also different, so that a certain error occurs in the actual calculation process, and therefore the error needs to be corrected, so that the standard flow rate Q is more accurately determined0And actual consumption flow rate Q1The accuracy of judgment is further improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. A fault diagnosis system for a hydrogen fuel cell drain gas exhaust device, characterized by comprising: a drainage device; the water discharging device comprises a hydrogen discharging valve;
the hydrogen spraying parameter acquisition module is used for acquiring hydrogen spraying parameters and transmitting the hydrogen spraying parameters to the control module; the hydrogen spraying parameter acquisition module comprises:
a hydrogen jet inlet pressure sensor for measuring the pressure P of the hydrogen jet inlet0；
A hydrogen ejection port pressure sensor for measuring the hydrogen ejection port pressure P1；
The hydrogen spraying duty ratio sensor is used for measuring the hydrogen spraying duty ratio;
the galvanic pile output current meter is used for measuring the galvanic pile output current I;
the MAP module is used for storing the MAP and searching the MAP according to the hydrogen injection parameters to obtain standard flowQuantity Q0；
An actual flow calculation module for obtaining actual consumption flow Q according to the electric pile output current I1；
A state output module for judging the standard flow Q0If the actual consumption flow is larger than the actual consumption flow Q1, if so, the output hydrogen discharge valve is in a normal state, and a flooding phenomenon can occur, otherwise, the output hydrogen discharge valve is in an abnormal state, and the flooding phenomenon cannot occur;
the hydrogen spraying parameter acquisition module further comprises: the flowmeter is used for acquiring the flow Q;
the hydrogen injection parameter acquisition module is also used for acquiring the MAP construction parameters; the MAP graph construction parameter includes a hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spray duty cycle, flow Q;
further comprising: and the MAP graph building module is used for judging whether the hydrogen injection duty ratio reaches an adjusting end point, if not, adjusting the hydrogen injection duty ratio until the hydrogen injection duty ratio reaches the adjusting end point, building a MAP graph according to MAP graph building parameters and transmitting the MAP graph to the MAP graph module.
2. The fault diagnosis system for the hydrogen fuel cell exhaust device according to claim 1, further comprising a hydrogen injection duty cycle adjustment module for adjusting the hydrogen injection duty cycle to cooperate with the hydrogen injection parameter collection module to collect the MAP construction parameters.
3. The system of claim 2, wherein the hydrogen injection parameter collecting module further comprises a thermometer for collecting an actual hydrogen injection inlet temperature T1And MAP graph hydrogen injection inlet temperature T0；
The device also comprises a flow correction module for judging the actual hydrogen jet inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0And if not, carrying out flow correction.
4. The fault diagnosis system for a hydrogen fuel cell drain gas exhaust device according to claim 3, characterized in that the flow correction is based on a formula
Figure FDA0003362353120000021
Putting Q' into0Is assigned to Q0。
5. A failure diagnosis method for a hydrogen fuel cell drain gas exhaust apparatus using the system according to any one of claims 1 to 4, characterized by comprising:
constructing a MAP graph;
the constructing of the MAP includes: collecting MAP graph construction parameters; the MAP graph construction parameter includes a hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spray duty cycle, flow Q;
judging whether the hydrogen spraying duty ratio reaches an adjusting end point, if so, constructing the MAP according to the MAP graph construction parameters, otherwise, adjusting the hydrogen spraying duty ratio and continuously collecting the MAP graph construction parameters;
collecting hydrogen spraying parameters; the hydrogen injection parameters comprise hydrogen injection inlet pressure P0Hydrogen discharge port pressure P1Hydrogen spraying duty ratio and electric pile output current I;
searching the MAP according to the hydrogen injection parameters to obtain standard flow Q0；
Obtaining actual consumption flow Q according to the electric pile output current I1；
Judging the standard flow Q0Whether or not it is larger than the actual consumption flow Q1If yes, the output hydrogen discharge valve is in a normal state, and a water flooding phenomenon can occur; otherwise, the output hydrogen discharge valve is abnormal in state, and the flooding phenomenon cannot occur.
6. The fault diagnosis method for a hydrogen fuel cell drain exhaust apparatus according to claim 5, wherein the MAP construction parameters further include: MAP graph hydrogen jet inlet temperature T0；
The hydrogen injection parameters further comprise actual hydrogen injection inlet temperature T1。
7. The fault diagnosis method for a hydrogen fuel cell drain gas exhaust device according to claim 6, characterized by further comprising:
judging the actual hydrogen jet inlet temperature T1Whether or not equal to the MAP graph hydrogen injection inlet temperature T0And if not, carrying out flow correction.
8. The fault diagnosis method for a hydrogen fuel cell drain gas exhaust device according to claim 7, characterized in that the flow rate correction includes:
computing
Figure FDA0003362353120000031
Putting Q' into0Is assigned to Q0。
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