CN114759233B - Nitrogen exhaust valve control method suitable for hydrogen fuel system and nitrogen exhaust valve system thereof - Google Patents

Nitrogen exhaust valve control method suitable for hydrogen fuel system and nitrogen exhaust valve system thereof Download PDF

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CN114759233B
CN114759233B CN202210568401.1A CN202210568401A CN114759233B CN 114759233 B CN114759233 B CN 114759233B CN 202210568401 A CN202210568401 A CN 202210568401A CN 114759233 B CN114759233 B CN 114759233B
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nitrogen
mass
discharge valve
accumulation
nitrogen discharge
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CN114759233A (en
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温永岁
董震
周洪雷
董清华
李刚
仝淼
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Suzhou Suyu Technology Co ltd
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Suzhou Suyu Technology 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
    • H01M8/04992—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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/27—Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N3/00—Computing arrangements based on biological models
    • G06N3/02—Neural networks
    • G06N3/04—Architecture, e.g. interconnection topology
    • G06N3/044—Recurrent networks, e.g. Hopfield networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N3/00—Computing arrangements based on biological models
    • G06N3/02—Neural networks
    • G06N3/08—Learning methods
    • 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
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • 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
    • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
    • H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
    • 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 relates to a nitrogen discharge valve control method suitable for a hydrogen fuel system and a nitrogen discharge valve system thereof, which comprises the following steps of: establishing a model of the pulling load current and the anode accumulated nitrogen mass rate by adopting a BP neural network, and further calculating the anode accumulated nitrogen mass rate according to the pulling load current; step 2: establishing a model of the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve and the nitrogen discharge mass rate of the nitrogen discharge valve by adopting a BP neural network, and further calculating the nitrogen discharge mass rate of the nitrogen discharge valve according to the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve; step 3: calculating the mass of the anode accumulated nitrogen in real time through the mass rate of the anode accumulated nitrogen, clearing the nitrogen discharge mass and the nitrogen discharge time when the mass of the anode accumulated nitrogen reaches M1, and opening a nitrogen discharge valve; step 4: and calculating the discharge quality of the nitrogen in real time according to the nitrogen discharge rate, and clearing the accumulated quality and the accumulated time of the nitrogen when the discharge quality reaches M1, and closing the nitrogen discharge valve. The invention can improve the hydrogen utilization rate and the pile performance.

Description

Nitrogen exhaust valve control method suitable for hydrogen fuel system and nitrogen exhaust valve system thereof
Technical Field
The invention belongs to the field of hydrogen fuel systems, and relates to the field of nitrogen valve control of hydrogen fuel systems, in particular to a nitrogen valve control method and a nitrogen valve system suitable for the hydrogen fuel system.
Background
The hydrogen in the hydrogen fuel cell enters the anode of the fuel cell through the pressure regulation of the hydrogen inlet valve and the proportional valve, electrons reach the cathode through an external circuit to form a current loop to generate electric energy, hydrogen protons react with oxygen of the cathode through the proton exchange membrane to generate water, and meanwhile, a small amount of nitrogen, water and other impurities permeate into the anode, so that a drain valve at the tail part of a hydrogen pipeline needs to be opened for draining water, the nitrogen discharge valve discharges nitrogen and other impurity gases, and the nitrogen discharge valve discharges mainly nitrogen, so that other impurity gases are not one order of magnitude compared with the nitrogen and can be ignored, the nitrogen discharge valve discharges nitrogen to describe below, and other impurity gases are ignored.
At present, the control of the nitrogen removal valve is mainly calibrated through experience to fix the opening period, the opening time and the closing time of the nitrogen removal valve. However, the nitrogen quantity existing in the anode cannot be reacted by controlling the fixed opening period, the opening time and the closing time of the nitrogen discharge valve, and excessive hydrogen can be discharged due to higher opening frequency or longer opening time of the nitrogen discharge valve, so that hydrogen resource waste is caused, and the system efficiency is low; the nitrogen discharge valve has low opening frequency or short opening time, which can cause excessive anode impurities, lower monolithic voltage and even influence the service life of a pile.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a nitrogen discharge valve control method suitable for a hydrogen fuel system and a nitrogen discharge valve system thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a control method of a nitrogen discharge valve suitable for a hydrogen fuel system,
the method comprises the following steps:
step 1: establishing a model of the pulling load current and the anode accumulated nitrogen mass rate by adopting a BP neural network, and further calculating the anode accumulated nitrogen mass rate according to the pulling load current;
step 2: establishing a model of the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve and the nitrogen discharge mass rate of the nitrogen discharge valve by adopting a BP neural network, and further calculating the nitrogen discharge mass rate of the nitrogen discharge valve according to the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve;
step 3: calculating the mass of the anode accumulated nitrogen in real time through the mass rate of the anode accumulated nitrogen, and when the mass of the anode accumulated nitrogen reaches M1, clearing 0 of the nitrogen discharge mass and the nitrogen discharge time, and opening a nitrogen discharge valve;
step 4: and calculating the discharge quality of the nitrogen in real time according to the nitrogen discharge rate, and when the discharge quality reaches M1, clearing 0 the accumulation quality and accumulation time of the nitrogen, and closing the nitrogen discharge valve.
Preferably, the nitrogen discharge valve control method is suitable for a hydrogen fuel system,
the method comprises the following steps:
(1) Training out a model by adopting a BP neural network, wherein the model takes a pulling load current I, I=0-550A, the number of fuel cell sheets N, N=360 as input, takes a nitrogen accumulation rate V1, V1=0-1 g/S as output, the input is a pile number N, the pulling load current I and the output is a nitrogen and impurity gas accumulation rate V1, and an S function is adopted as a BP neural network activation function, wherein the S function is shown as a formula (1);
(2) When the number of the fuel cells of the system is 360, the pulling load current I is input into the model trained in the step (1), and the corresponding nitrogen accumulation rate V1 can be obtained;
(3) Training out a model by using the BP neural network, wherein the model takes the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, P=5-130 KPa as input, the nitrogen discharge rate V2 of the nitrogen discharge valve and V2=0-5 g/S as output, the input is the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, and the output is the nitrogen discharge rate V2 of the nitrogen discharge valve, and the BP neural network activation function adopts an S function, wherein the S function is shown as a formula (1);
(4) Inputting the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P into the model trained in the step (3), and obtaining the corresponding nitrogen discharge rate V2 of the nitrogen discharge valve;
(5) Controlling the starting of a fuel cell system, and starting the fuel cell;
(6) The nitrogen discharge valve is controlled to be opened for T1 seconds, 3< T1<10, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of the nitrogen, and when the accumulated mass of the nitrogen reaches M1 g and 0 g<M1<When the valve is in the range of (1), the nitrogen removal time is clear 0, the nitrogen removal quality is clear 0, and the nitrogen removal valve is opened;
(9) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the accumulation mass is clear 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of nitrogen, wherein the accumulated mass of nitrogen reaches M1 g and 0 g<M1<When=1, the nitrogen removal time is 0, the nitrogen removal quality is 0, and the nitrogen removal valve is opened, wherein 1.5<＝C1<＝4；
(12) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the nitrogen accumulation quality is clear 0, and the nitrogen discharge valve is closed;
(13) Executing the step (14) when the purging is completed, otherwise executing the steps (11) and (12);
(14) The nitrogen discharge valve is closed, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, the nitrogen discharge time is 0, and the nitrogen discharge mass is 0.
Preferably, the nitrogen discharge valve control method is suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 9 seconds, nitrogen in the anode of the fuel cell is purged completely, the nitrogen of the anode is prevented from affecting the starting of the fuel cell, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=1 g, clearing 0 in nitrogen removal time, clearing 0 in nitrogen removal mass, and opening a nitrogen removal valve;
(9) According to the pressure difference P=130 Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following stepsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=1 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, wherein when the nitrogen accumulation mass reaches M1=1 g, the nitrogen discharge time is 0, the nitrogen discharge mass is 0, and a nitrogen discharge valve is opened;
(12) According to the pressure difference P=130 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=1 g, the nitrogen accumulation time is clear 0, the nitrogen accumulation mass is clear 0, and the nitrogen discharge valve is closed.
Preferably, the nitrogen discharge valve control method is suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 4 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=100deg.A, the nitrogen accumulation rate V1=0.5g/s is calculated by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=0.3 g, clearing 0 nitrogen discharge time, clearing 0 nitrogen discharge mass, and opening a nitrogen discharge valve;
(9) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=0.3 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=100deg.A, and the nitrogen accumulation rate V1=0.5 g/s calculated in the combination of the steps (1) and (2), according toCalculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.3 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.3 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
Preferably, the nitrogen discharge valve control method is suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 6 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=0.8g, clearing 0 nitrogen discharge time, clearing 0 nitrogen discharge mass, and opening a nitrogen discharge valve;
(9) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=0.8g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.8 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.8 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
The utility model provides a nitrogen valve system that arranges suitable for hydrogen fuel system, includes pile and high-pressure hydrogen storage bottle, the output of high-pressure hydrogen storage bottle links to each other with the input of advance hydrogen valve, the output of advance hydrogen valve links to each other with the input of proportional valve, the output of proportional valve links to each other with the hydrogen input of pile, the positive pole output of pile links to each other with the input of gas-water separator, the hydrogen end of gas-water separator links to each other with the input of hydrogen circulating pump, the output of hydrogen circulating pump is connected to the hydrogen input of pile, the nitrogen output of gas-water separator links to each other with the input of nitrogen valve, the drainage output of gas-water separator links to each other with the input of drain valve, advance hydrogen valve, proportional valve, gas-water separator, hydrogen circulating pump, nitrogen valve and drain valve all with the FCU controller looks electricity federation.
Preferably, the nitrogen discharge valve system is suitable for a hydrogen fuel system, and the nitrogen discharge valve and the drain valve are externally connected to a mixed discharge pipeline.
Preferably, in the nitrogen exhaust valve system suitable for the hydrogen fuel system, a hydrogen in-pile pressure sensor and a hydrogen in-pile temperature sensor are connected between the proportional valve and the electric pile.
By means of the scheme, the invention has at least the following advantages:
the invention can calculate the accumulation quality of the nitrogen at the tail of the anode in real time, the nitrogen is discharged by the nitrogen discharge valve, and the opening time and the opening period of the nitrogen discharge valve are controlled according to the accumulation quality of the nitrogen, so that the hydrogen is saved, the hydrogen utilization rate is improved, and the galvanic pile performance is improved.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the accumulation rate of nitrogen and impurity gases for BP neural network training of the present invention;
FIG. 3 is a flow chart of calculation of the accumulation rate of nitrogen and impurity gases according to the present invention;
FIG. 4 is a schematic diagram of the BP neural network training nitrogen and impurity gas discharge rates of the present invention;
FIG. 5 is a flow chart of the calculation of the nitrogen and impurity gas discharge rate according to the present invention;
FIG. 6 is a flow chart of a method of controlling a nitrogen vent valve in accordance with the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, the terms "vertical," "horizontal," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that the product of the application is conventionally put in use, merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or vertical, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Examples
As shown in fig. 1, a nitrogen discharge valve system suitable for a hydrogen fuel system comprises a galvanic pile 1 and a high-pressure hydrogen storage bottle 2, wherein the output end of the high-pressure hydrogen storage bottle 2 is connected with the input end of a hydrogen inlet valve 3, the output end of the hydrogen inlet valve 3 is connected with the input end of a proportional valve 4, the output end of the proportional valve 4 is connected with the hydrogen input end of the galvanic pile 1, the anode output end of the galvanic pile 1 is connected with the input end of a gas-water separator 5, the hydrogen end of the gas-water separator 5 is connected with the input end of a hydrogen circulating pump 6, the output end of the hydrogen circulating pump 6 is connected to the hydrogen input end of the galvanic pile 1, the nitrogen output end of the gas-water separator 5 is connected with the input end of a nitrogen discharge valve 7, the water discharge output end of the gas-water separator 5 is connected with the input end of a water discharge valve 8, and the hydrogen inlet valve 3, the proportional valve 4, the gas-water separator 5, the hydrogen circulating pump 6, the nitrogen discharge valve 7 and the water discharge valve 8 are all electrically connected with an FCU controller 11.
In the invention, the nitrogen discharge valve 7 and the water discharge valve 8 are externally connected to a mixed discharge pipeline 9.
In the invention, a hydrogen in-stack pressure sensor 10 and a hydrogen in-stack temperature sensor 12 are connected between the proportional valve 4 and the electric stack 1.
Specifically, the high-pressure hydrogen storage bottle is used for storing high-purity high-pressure hydrogen and providing hydrogen for the system; the hydrogen inlet valve is arranged at the front end of the anode of the electric pile and is an opening and closing valve for controlling the on-off of hydrogen entering the electric pile; the proportional valve is arranged between the hydrogen inlet valve and the anode inlet of the electric pile and is a valve with 0-100% of opening degree, and the opening degree of the proportional valve can be controlled to adjust the flow rate of hydrogen entering the electric pile and the pressure of the anode of the electric pile; the hydrogen stacking pressure sensor and the hydrogen stacking temperature sensor are arranged between the proportional valve and the anode inlet of the electric pile and are respectively used for collecting the stacking pressure and the stacking temperature of the anode of the electric pile; the inlet of the gas-water separator is connected with the anode outlet pipeline of the electric pile, the gas outlet is connected with the inlet of the hydrogen circulating pump, and the water outlet is connected with the drain valve and is used for separating water and hydrogen in the gas at the anode outlet of the electric pile; the inlet of the hydrogen circulating pump is connected with the hydrogen outlet of the gas-water separator, the outlet of the hydrogen circulating pump is connected with a hydrogen pipeline between the proportional valve and the hydrogen stacking pressure sensor, the inlet of the drain valve is connected with the water outlet of the gas-water separator, and the outlet of the drain valve is connected with the mixed discharge pipeline; the inlet of the nitrogen discharge valve is connected with the nitrogen discharge outlet of the gas-water separator, and the outlet of the nitrogen discharge valve is connected with the mixed discharge pipeline.
As shown in fig. 2 to 6, a nitrogen discharge valve control method suitable for a hydrogen fuel system,
the method comprises the following steps:
step 1: establishing a model of the pulling load current and the anode accumulated nitrogen mass rate by adopting a BP neural network, and further calculating the anode accumulated nitrogen mass rate according to the pulling load current;
step 2: establishing a model of the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve and the nitrogen discharge mass rate of the nitrogen discharge valve by adopting a BP neural network, and further calculating the nitrogen discharge mass rate of the nitrogen discharge valve according to the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve;
step 3: calculating the mass of the anode accumulated nitrogen in real time through the mass rate of the anode accumulated nitrogen, and when the mass of the anode accumulated nitrogen reaches M1, clearing 0 of the nitrogen discharge mass and the nitrogen discharge time, and opening a nitrogen discharge valve;
step 4: and calculating the discharge quality of the nitrogen in real time according to the nitrogen discharge rate, and when the discharge quality reaches M1, clearing 0 the accumulation quality and accumulation time of the nitrogen, and closing the nitrogen discharge valve.
Example 1
Based on the embodiment, a nitrogen discharge valve control method suitable for a hydrogen fuel system,
the method comprises the following steps:
(1) Training out a model by adopting a BP neural network, wherein the model takes a pulling load current I, I=0-550A, the number of fuel cell sheets N, N=360 as input, takes a nitrogen accumulation rate V1, V1=0-1 g/S as output, the input is a pile number N, the pulling load current I and the output is a nitrogen and impurity gas accumulation rate V1, and an S function is adopted as a BP neural network activation function, wherein the S function is shown as a formula (1);
(2) When the number of the fuel cells of the system is 360, the pulling load current I is input into the model trained in the step (1), and the corresponding nitrogen accumulation rate V1 can be obtained;
(3) Training out a model by using the BP neural network, wherein the model takes the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, P=5-130 KPa as input, the nitrogen discharge rate V2 of the nitrogen discharge valve and V2=0-5 g/S as output, the input is the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, and the output is the nitrogen discharge rate V2 of the nitrogen discharge valve, and the BP neural network activation function adopts an S function, wherein the S function is shown as a formula (1);
(4) Inputting the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P into the model trained in the step (3), and obtaining the corresponding nitrogen discharge rate V2 of the nitrogen discharge valve;
(5) Controlling the starting of a fuel cell system, and starting the fuel cell;
(6) The nitrogen discharge valve is controlled to be opened for T1 seconds, 3< T1<10, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of the nitrogen, and when the accumulated mass of the nitrogen reaches M1 g and 0 g<M1<When the valve is in the range of (1), the nitrogen removal time is clear 0, the nitrogen removal quality is clear 0, and the nitrogen removal valve is opened;
(9) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the accumulation mass is clear 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of nitrogen, wherein the accumulated mass of nitrogen reaches M1 g and 0 g<M1<When=1, the nitrogen removal time is 0, the nitrogen removal quality is 0, and the nitrogen removal valve is opened, wherein 1.5<＝C1<＝4；
(12) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the nitrogen accumulation quality is clear 0, and the nitrogen discharge valve is closed;
(13) Executing the step (14) when the purging is completed, otherwise executing the steps (11) and (12);
(14) The nitrogen discharge valve is closed, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, the nitrogen discharge time is 0, and the nitrogen discharge mass is 0.
In step 11, the excess air ratio of the cathode side is more than 10 during purging, so that more nitrogen permeates into the anode, and the nitrogen discharge valve also discharges a part of water purged from the anode side, so that the factor C1,1.5< = c1< = 4, needs to be multiplied.
Example two
A control method of a nitrogen discharge valve suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 9 seconds, nitrogen in the anode of the fuel cell is purged completely, the nitrogen of the anode is prevented from affecting the starting of the fuel cell, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=1 g, clearing 0 in nitrogen removal time, clearing 0 in nitrogen removal mass, and opening a nitrogen removal valve;
(9) According to the pressure difference P=130 Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following stepsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=1 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculation ofThe nitrogen accumulation mass reaches M1=1 g, the nitrogen discharge time is clear 0, the nitrogen discharge mass is clear 0, and a nitrogen discharge valve is opened;
(12) According to the pressure difference P=130 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=1 g, the nitrogen accumulation time is clear 0, the nitrogen accumulation mass is clear 0, and the nitrogen discharge valve is closed.
Example III
A control method of a nitrogen discharge valve suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 4 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=100deg.A, the nitrogen accumulation rate V1=0.5g/s is calculated by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=0.3 g, clearing 0 nitrogen discharge time, clearing 0 nitrogen discharge mass, and opening a nitrogen discharge valve;
(9) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=0.3 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=100deg.A, the nitrogen accumulation rate V1=0.5g/s is calculated by combining the steps (1) and (2), according to the following conditionsCalculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.3 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.3 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
Example IV
A control method of a nitrogen discharge valve suitable for a hydrogen fuel system,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 6 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=0.8g, clearing 0 nitrogen discharge time, clearing 0 nitrogen discharge mass, and opening a nitrogen discharge valve;
(9) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating nitrogen emissionsWhen the nitrogen discharge quality reaches M1=0.8 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.8 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.8 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
In the above-mentioned embodiments, in the process of step 1 to step 4, a BP neural network system is established for the whole system, and the second embodiment to the fourth embodiment are all based on the model established by the BP neural network system in the first embodiment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (4)

1. A control method of a nitrogen discharge valve suitable for a hydrogen fuel system,
the method comprises the following steps:
step 1: establishing a model of the pulling load current and the anode accumulated nitrogen mass rate by adopting a BP neural network, and further calculating the anode accumulated nitrogen mass rate according to the pulling load current;
step 2: establishing a model of the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve and the nitrogen discharge mass rate of the nitrogen discharge valve by adopting a BP neural network, and further calculating the nitrogen discharge mass rate of the nitrogen discharge valve according to the internal pressure and the atmospheric pressure difference of the nitrogen discharge valve;
step 3: calculating the mass of the anode accumulated nitrogen in real time through the mass rate of the anode accumulated nitrogen, and when the mass of the anode accumulated nitrogen reaches M1, clearing 0 of the nitrogen discharge mass and the nitrogen discharge time, and opening a nitrogen discharge valve;
step 4: calculating the discharge quality of nitrogen in real time according to the nitrogen discharge rate, and when the discharge quality reaches M1, clearing 0 the accumulation quality and accumulation time of the nitrogen, and closing a nitrogen discharge valve;
the method is characterized by comprising the following steps of:
(1) Training out a model by adopting a BP neural network, wherein the model takes a pulling load current I, I=0-550A, the number of fuel cell sheets N, N=360 as input, takes a nitrogen accumulation rate V1, V1=0-1 g/S as output, the input is a pile number N, the pulling load current I and the output is a nitrogen and impurity gas accumulation rate V1, and an S function is adopted as a BP neural network activation function, wherein the S function is shown as a formula (1);
(2) When the number of the fuel cells of the system is 360, the pulling load current I is input into the model trained in the step (1), and the corresponding nitrogen accumulation rate V1 can be obtained;
(3) Training out a model by using the BP neural network, wherein the model takes the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, P=5-130 KPa as input, the nitrogen discharge rate V2 of the nitrogen discharge valve and V2=0-5 g/S as output, the input is the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P, and the output is the nitrogen discharge rate V2 of the nitrogen discharge valve, and the BP neural network activation function adopts an S function, wherein the S function is shown as a formula (1);
(4) Inputting the internal pressure of the nitrogen discharge valve and the atmospheric pressure difference P into the model trained in the step (3), and obtaining the corresponding nitrogen discharge rate V2 of the nitrogen discharge valve;
(5) Controlling the starting of a fuel cell system, and starting the fuel cell;
(6) The nitrogen discharge valve is controlled to be opened for T1 seconds, 3< T1<10, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of the nitrogen, and when the accumulated mass of the nitrogen reaches M1 g and 0 g<M1<When the valve is in the range of (1), the nitrogen removal time is clear 0, the nitrogen removal quality is clear 0, and the nitrogen removal valve is opened;
(9) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the accumulation mass is clear 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I, calculating a nitrogen accumulation rate V1 by combining the steps (1) and (2), and according to the current pulling current ICalculating the accumulated mass of nitrogen, wherein the accumulated mass of nitrogen reaches M1 g and 0 g<M1<When=1, the nitrogen removal time is 0, the nitrogen removal quality is 0, and the nitrogen removal valve is opened, wherein 1.5<＝C1<＝4；
(12) According to the pressure difference P between the internal air pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according toCalculating the nitrogen emission mass which reaches M1 g and 0<M1<When the nitrogen accumulation time is clear 0, the nitrogen accumulation quality is clear 0, and the nitrogen discharge valve is closed;
(13) Executing the step (14) when the purging is completed, otherwise executing the steps (11) and (12);
(14) The nitrogen discharge valve is closed, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, the nitrogen discharge time is 0, and the nitrogen discharge mass is 0.
2. A method of controlling a nitrogen purge valve for a hydrogen fuel system according to claim 1,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 9 seconds, nitrogen in the anode of the fuel cell is purged completely, the nitrogen of the anode is prevented from affecting the starting of the fuel cell, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=1 g, clearing 0 in nitrogen removal time, clearing 0 in nitrogen removal mass, and opening a nitrogen removal valve;
(9) According to the pressure difference P=130 Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following stepsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=1 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=550A, calculating the nitrogen gas accumulation rate V1 = 1g/s by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, wherein when the nitrogen accumulation mass reaches M1=1 g, the nitrogen discharge time is 0, the nitrogen discharge mass is 0, and a nitrogen discharge valve is opened;
(12) According to the pressure difference P=130 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2 = 5g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=1 g, the nitrogen accumulation time is clear 0, the nitrogen accumulation mass is clear 0, and the nitrogen discharge valve is closed.
3. A method of controlling a nitrogen purge valve for a hydrogen fuel system according to claim 1,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 4 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=100deg.A, the nitrogen accumulation rate V1=0.5g/s is calculated by combining the steps (1) and (2), according to the following conditionsCalculating the nitrogen accumulation mass, when the nitrogen accumulation mass reaches M1=0.3 g, clearing 0 nitrogen discharge time, clearing 0 nitrogen discharge mass, and opening a nitrogen discharge valve;
(9) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=0.3 g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=100deg.A, the nitrogen accumulation rate V1=0.5g/s is calculated by combining the steps (1) and (2), according to the following conditionsCalculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.3 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=50Kpa between the internal pressure of the nitrogen discharge valve and the atmospheric pressure, the nitrogen discharge rate V2 = 2g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.3 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
4. A method of controlling a nitrogen purge valve for a hydrogen fuel system according to claim 1,
the method comprises the following steps:
(6) The nitrogen discharge valve is controlled to be opened for 6 seconds, nitrogen in the anode of the fuel cell is purged completely, and then the nitrogen discharge valve is controlled to be closed;
(7) Controlling the load pulling of the fuel cell, and simultaneously, clearing 0 of nitrogen accumulation time, 0 of nitrogen accumulation mass, 0 of nitrogen discharge time and 0 of nitrogen discharge mass;
(8) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the accumulation mass of nitrogen as nitrogenWhen the accumulated gas mass reaches M1=0.8 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(9) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsCalculating the nitrogen emission quality, wherein when the nitrogen emission quality reaches M1=0.8g, the nitrogen accumulation time is 0, the accumulation quality is 0, and the nitrogen discharge valve is closed;
(10) If the purging state is entered, executing the steps (11) and (12), otherwise, continuing to execute the steps (8) and (9);
(11) According to the current pulling current I=300A, calculating the nitrogen accumulation rate V1 = 0.8g/s according to the steps (1) and (2)Calculating the accumulated mass of nitrogen, wherein when the accumulated mass of nitrogen reaches M1=0.8 g, the nitrogen removal time is 0, the nitrogen removal mass is 0, and a nitrogen removal valve is opened;
(12) According to the pressure difference P=100 KPa between the internal pressure and the atmospheric pressure of the nitrogen discharge valve, the nitrogen discharge rate V2=4 g/s of the nitrogen discharge valve is calculated by combining the steps (3) and (4), and according to the following conditionsAnd calculating the nitrogen emission mass, wherein if the nitrogen emission mass reaches M1=0.8 g, the nitrogen accumulation time is 0, the nitrogen accumulation mass is 0, and the nitrogen discharge valve is closed.
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