WO2013137334A1 - 燃料電池システム - Google Patents
燃料電池システム Download PDFInfo
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- WO2013137334A1 WO2013137334A1 PCT/JP2013/057041 JP2013057041W WO2013137334A1 WO 2013137334 A1 WO2013137334 A1 WO 2013137334A1 JP 2013057041 W JP2013057041 W JP 2013057041W WO 2013137334 A1 WO2013137334 A1 WO 2013137334A1
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- pressure
- fuel cell
- upper limit
- anode gas
- lower limit
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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
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04104—Regulation of differential pressures
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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
- H01M8/04313—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
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04783—Pressure differences, e.g. between anode and cathode
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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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
- H01M8/1018—Polymeric electrolyte materials
- H01M8/1039—Polymeric electrolyte materials halogenated, e.g. sulfonated polyvinylidene fluorides
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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
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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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
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Definitions
- the present invention relates to a fuel cell system.
- JP 2005-243476A discloses an anode gas non-circulation type fuel cell system in which unused anode gas discharged into an anode gas discharge passage is not returned to the anode gas supply passage as a conventional fuel cell system.
- This conventional fuel cell system performs a pulsating operation that raises or lowers the pressure of the anode gas, and supplies a larger amount of anode gas than the required flow rate to the fuel cell at the time of pressure increase, so that impurities staying in the fuel cell are retained.
- the inventors have repeatedly set anode pressure as a target pressure, and perform anode gas pulsation control by performing feedback control of the anode gas pressure using a pressure regulating valve so that the pressure becomes the target pressure. Are considering.
- pulsation upper limit pressure for ensuring the performance requirement of the stack, for example, to push the water in the stack into a buffer tank or the like.
- upper limit pressure of pulsation for ensuring durability such as taking into account the mechanical strength of the electrolyte membrane.
- Exceeding the upper limit pressure in consideration of durability may shorten the product life.For example, always set a target pressure lower than the upper limit pressure as the target value for feedback control so that the target upper limit pressure is not exceeded. It is possible to give.
- the target pressure is always set lower than the upper limit pressure, if the upper limit pressure of pulsation to ensure performance requirements is set, the target pressure is set lower, so that sufficient pulsation The amplitude may not be given and water drainage may be insufficient.
- the present invention has been made paying attention to such a problem, and an object thereof is to provide optimum target pressure feedback control in accordance with the set pulsation upper limit pressure.
- a control valve for controlling the pressure of the anode gas supplied to the fuel cell, a pressure detection unit for detecting the pressure of the anode gas supplied to the fuel cell, and a target pressure of the anode gas as a target
- the control valve is feedback controlled to control the anode gas
- the pressure control unit that controls the pressure, the upper limit value of the anode gas that is set based on the durability performance of the fuel cell, and the upper limit value of the anode gas that is set based on the output performance of the fuel cell are smaller.
- a fuel cell system comprising: an upper limit pressure setting unit that sets an upper limit pressure of the anode gas.
- an upper limit pressure setting unit selects the upper limit value of the anode gas set based on the durability performance of the fuel cell as the upper limit pressure of the anode gas, a value smaller than the upper limit value is set as the target upper limit pressure.
- a pressure larger than the upper limit value is set as the target upper limit pressure.
- FIG. 1A is a schematic perspective view of a fuel cell according to a first embodiment of the present invention.
- FIG. 1B is a cross-sectional view taken along the line IB-IB of the fuel cell 10 of FIG. 1A.
- FIG. 2 is a schematic configuration diagram of the anode gas non-circulating fuel cell system according to the first embodiment of the present invention.
- FIG. 3 is a flowchart illustrating pulsation operation control according to the first embodiment of the present invention.
- FIG. 4 is a flowchart for explaining the anode pressure lower limit pressure calculation process.
- FIG. 5 is a table for calculating the power generation request lower limit value based on the target output current.
- FIG. 6 is a flowchart for explaining an anode pressure upper limit pressure calculation process.
- FIG. 1A is a schematic perspective view of a fuel cell according to a first embodiment of the present invention.
- FIG. 1B is a cross-sectional view taken along the line IB-IB of the fuel cell 10 of
- FIG. 7 is a table for calculating the pressure increase value based on the target output current.
- FIG. 8 is a flowchart illustrating the control target lower limit pressure calculation process.
- FIG. 9 is a flowchart for explaining the control target upper limit pressure calculation process.
- FIG. 10 is a flowchart for explaining the pulsation operation processing.
- FIG. 11 is a flowchart for explaining the anode pressure increasing process.
- FIG. 12 is a table for calculating the step-up change rate based on the target output current.
- FIG. 13 is a flowchart for explaining the anode pressure reduction process.
- FIG. 14 is a time chart for explaining the operation of the pulsation operation control according to the first embodiment of the present invention.
- FIG. 14 is a time chart for explaining the operation of the pulsation operation control according to the first embodiment of the present invention.
- FIG. 15 is a time chart for explaining the operation of the pulsation operation control according to the first embodiment of the present invention.
- FIG. 16 is a diagram for explaining the effect obtained by setting the target anode pressure so that the anode pressure is increased from the lower limit pressure toward the control target upper limit pressure at a desired rate of increase in pressure.
- FIG. 17 is a flowchart illustrating the boosting process according to the second embodiment of the present invention.
- FIG. 18 is a flowchart for explaining step-down processing according to the second embodiment of the present invention.
- FIG. 19 is a time chart for explaining the operation of the pulsation operation control according to the second embodiment of the present invention.
- an electrolyte membrane is sandwiched between an anode electrode (fuel electrode) and a cathode electrode (oxidant electrode), an anode gas containing hydrogen in the anode electrode (fuel gas), and a cathode gas containing oxygen in the cathode electrode (oxidant) Electricity is generated by supplying gas.
- the electrode reaction that proceeds in both the anode electrode and the cathode electrode is as follows.
- Anode electrode 2H 2 ⁇ 4H + + 4e ⁇ (1)
- Cathode electrode 4H + + 4e ⁇ + O 2 ⁇ 2H 2 O (2)
- the fuel cell generates an electromotive force of about 1 volt by the electrode reactions (1) and (2).
- FIG. 1A and 1B are diagrams illustrating the configuration of the fuel cell 10 according to the first embodiment of the present invention.
- FIG. 1A is a schematic perspective view of the fuel cell 10.
- FIG. 1B is a cross-sectional view taken along the line IB-IB of the fuel cell 10 of FIG. 1A.
- the fuel cell 10 includes an anode separator 12 and a cathode separator 13 arranged on both front and back surfaces of a membrane electrode assembly (hereinafter referred to as “MEA”) 11.
- MEA membrane electrode assembly
- the MEA 11 includes an electrolyte membrane 111, an anode electrode 112, and a cathode electrode 113.
- the MEA 11 has an anode electrode 112 on one surface of the electrolyte membrane 111 and a cathode electrode 113 on the other surface.
- the electrolyte membrane 111 is a proton conductive ion exchange membrane formed of a fluorine-based resin.
- the electrolyte membrane 111 exhibits good electrical conductivity in a wet state.
- the anode electrode 112 includes a catalyst layer 112a and a gas diffusion layer 112b.
- the catalyst layer 112a is in contact with the electrolyte membrane 111.
- the catalyst layer 112a is formed of carbon black particles carrying platinum or platinum.
- the gas diffusion layer 112b is provided outside the catalyst layer 112a (on the opposite side of the electrolyte membrane 111) and is in contact with the anode separator 12.
- the gas diffusion layer 112b is formed of a member having sufficient gas diffusibility and conductivity, and is formed of, for example, a carbon cloth woven with yarns made of carbon fibers.
- the cathode electrode 113 includes a catalyst layer 113a and a gas diffusion layer 113b.
- the anode separator 12 is in contact with the gas diffusion layer 112b.
- the anode separator 12 has a plurality of groove-shaped anode gas passages 121 for supplying anode gas to the anode electrode 112 on the side in contact with the gas diffusion layer 112b.
- the cathode separator 13 is in contact with the gas diffusion layer 113b.
- the cathode separator 13 has a plurality of groove-like cathode gas flow paths 131 for supplying cathode gas to the cathode electrode 113 on the side in contact with the gas diffusion layer 113b.
- the anode gas flowing through the anode gas channel 121 and the cathode gas flowing through the cathode gas channel 131 flow in the same direction in parallel with each other. You may make it flow in the opposite direction in parallel with each other.
- FIG. 2 is a schematic configuration diagram of the anode gas non-circulating fuel cell system 1 according to the first embodiment of the present invention.
- the fuel cell system 1 includes a fuel cell stack 2, an anode gas supply device 3, and a controller 4.
- the fuel cell stack 2 is formed by stacking a plurality of fuel cells 10, generates electric power by receiving supply of anode gas and cathode gas, and generates electric power necessary for driving a vehicle (for example, electric power necessary for driving a motor). ).
- the cathode gas supply / discharge device for supplying and discharging the cathode gas to / from the fuel cell stack 2 and the cooling device for cooling the fuel cell stack 2 are not the main part of the present invention, and are not shown for the sake of easy understanding. did. In this embodiment, air is used as the cathode gas.
- the anode gas supply device 3 includes a high-pressure tank 31, an anode gas supply passage 32, a pressure regulating valve 33, a pressure sensor 34, an anode gas discharge passage 35, a buffer tank 36, a purge passage 37, and a purge valve 38. .
- the high pressure tank 31 stores the anode gas supplied to the fuel cell stack 2 in a high pressure state.
- the anode gas supply passage 32 is a passage for supplying the anode gas discharged from the high-pressure tank 31 to the fuel cell stack 2, and has one end connected to the high-pressure tank 31 and the other end of the fuel cell stack 2. Connected to the anode gas inlet hole 21.
- the pressure regulating valve 33 is provided in the anode gas supply passage 32.
- the pressure regulating valve 33 adjusts the anode gas discharged from the high-pressure tank 31 to a desired pressure and supplies it to the fuel cell stack 2.
- the pressure regulating valve 33 is an electromagnetic valve whose opening degree can be adjusted continuously or stepwise, and the opening degree is controlled by the controller 4.
- the pressure sensor 34 is provided in the anode gas supply passage 32 downstream of the pressure regulating valve 33.
- the pressure sensor 34 detects the pressure in the anode gas supply passage 32 downstream from the pressure regulating valve 33.
- the pressure detected by the pressure sensor 34 is used as a pressure of the entire anode system including the anode gas flow paths 121 and the buffer tanks 36 inside the fuel cell stack (hereinafter referred to as “anode pressure”). .
- the anode gas discharge passage 35 has one end connected to the anode gas outlet hole 22 of the fuel cell stack 2 and the other end connected to the upper portion of the buffer tank 36.
- the anode gas discharge passage 35 has a mixed gas of excess anode gas that has not been used for the electrode reaction and an inert gas such as nitrogen or water vapor that has permeated from the cathode side to the anode gas flow path 121 (hereinafter, “ Anode off gas ”) is discharged.
- the buffer tank 36 temporarily stores the anode off gas flowing through the anode gas discharge passage 35. A part of the water vapor in the anode off gas is condensed in the buffer tank 36 to become liquid water and separated from the anode off gas.
- One end of the purge passage 37 is connected to the lower part of the buffer tank 36.
- the other end of the purge passage 37 is an open end.
- the anode off gas and liquid water stored in the buffer tank 36 are discharged from the opening end to the outside air through the purge passage 37.
- the purge valve 38 is provided in the purge passage 37.
- the purge valve 38 is an electromagnetic valve whose opening degree can be adjusted continuously or stepwise, and the opening degree is controlled by the controller 4.
- the opening of the purge valve 38 By adjusting the opening of the purge valve 38, the amount of anode off gas discharged from the buffer tank 36 to the outside air via the purge passage 37 is adjusted, and the anode gas concentration in the anode system is adjusted to a predetermined concentration. .
- the set value of the predetermined concentration is too low, the anode gas used for the electrode reaction is insufficient, and the power generation efficiency is lowered.
- the predetermined concentration is set to an appropriate value in consideration of power generation efficiency and fuel consumption. If the operating state of the fuel cell system 1 is the same, the concentration of the inert gas in the buffer tank 36 decreases and the anode gas concentration increases as the opening of the purge valve 38 is increased.
- the controller 4 includes a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface).
- CPU central processing unit
- ROM read only memory
- RAM random access memory
- I / O interface input / output interface
- the controller 4 includes a current sensor 41 that detects the output current of the fuel cell stack 2, a water temperature sensor 42 that detects the temperature of cooling water that cools the fuel cell stack 2, and the fuel cell stack.
- the pressure sensor 43 detects the pressure of the cathode gas supplied to the battery (hereinafter referred to as “cathode pressure”)
- the accelerator stroke sensor 44 detects the amount of depression of the accelerator pedal (hereinafter referred to as “accelerator operation amount”)
- the battery charge rate Signals from various sensors that detect the operating state of the fuel cell system 1 such as the SOC sensor 45 to be detected are input.
- the controller 4 periodically opens and closes the pressure regulating valve 33 based on input signals of various sensors, performs pulsation operation to periodically increase and decrease the anode pressure, and adjusts the opening of the purge valve 38 to buffer
- the flow rate of the anode off gas discharged from the tank 36 is adjusted to keep the anode gas concentration in the anode system at a predetermined concentration.
- the upper limit pressure and the lower limit pressure are repeatedly set as the target pressure of the anode pressure, and feedback control is performed by the pressure regulating valve so as to be the set pressure, whereby the anode pressure is set between the upper limit pressure and the lower limit pressure.
- the pressure is periodically raised and lowered to pulsate.
- the liquid water in the anode gas passage 121 can be periodically discharged out of the anode gas passage 121 when the anode pressure is increased, so that the drainage performance of the fuel cell stack, and thus the output performance can be improved. Can be improved.
- FIG. 3 is a flowchart illustrating pulsation operation control according to the present embodiment.
- step S1 the controller 4 reads the detection signals of various sensors and detects the operating state of the fuel cell system.
- step S2 the controller 4 calculates the target output current of the fuel cell stack based on the operating state of the fuel cell system 1.
- step S3 the controller 4 performs a lower limit pressure calculation process for the anode pressure. Details of the lower limit pressure calculation process will be described later with reference to FIG.
- step S4 the controller 4 performs an anode pressure upper limit pressure calculation process. Details of the upper limit pressure calculation process will be described later with reference to FIG.
- step S5 the controller 4 performs a calculation process of a lower limit pressure (hereinafter referred to as “control target lower limit pressure”) that should be a target when the anode pressure is controlled to the lower limit pressure. Details of the control target lower limit pressure calculation process will be described later with reference to FIG.
- step S6 the controller 4 performs a calculation process of an upper limit pressure (hereinafter referred to as “control target upper limit pressure”) that should be a target when the anode pressure is controlled to the upper limit pressure. Details of the control target upper limit pressure calculation process will be described later with reference to FIG.
- step S7 the controller 4 performs a pulsation operation process. Details of the pulsation operation processing will be described later with reference to FIG.
- FIG. 4 is a flowchart for explaining the anode pressure lower limit pressure calculation process.
- the controller 4 calculates the film deterioration prevention lower limit value by subtracting the predetermined value ⁇ from the cathode pressure.
- the membrane degradation prevention lower limit value is a lower limit value of the anode pressure set from the viewpoint of ensuring the durability of the electrolyte membrane 111, and is a cathode pressure (pressure of the cathode gas flow channel 131) and an anode pressure (anode gas flow channel). 121 is a lower limit value of the cathode pressure necessary to prevent the electrolyte membrane 111 from deteriorating due to an excessive pressure difference.
- step S32 the controller 4 refers to the table of FIG. 5, and based on the target output current, the minimum anode pressure necessary for outputting the target output current (hereinafter referred to as “power generation request lower limit”). .) Is calculated. That is, the power generation request lower limit value is the lower limit value of the anode pressure set from the viewpoint of ensuring the output performance of the fuel cell stack 2.
- step S33 the controller 4 sets the larger one of the membrane deterioration prevention lower limit value and the power generation request lower limit value as the anode pressure lower limit pressure.
- the membrane deterioration prevention lower limit value and the power generation requirement lower limit value are equal, the membrane deterioration prevention lower limit value is set as the anode pressure lower limit pressure.
- FIG. 6 is a flowchart for explaining an anode pressure upper limit pressure calculation process.
- step S41 the controller 4 sets an allowable maximum upper limit value of the anode pressure.
- the allowable maximum upper limit value is an upper limit value of the anode pressure set from the viewpoint of ensuring the durability of the electrolyte membrane 111, and is necessary to prevent the electrolyte membrane 111 from being deteriorated due to an excessive anode pressure. This is the upper limit of the cathode pressure.
- the allowable maximum upper limit value is determined according to the specifications of the fuel cell stack 2, and is a predetermined value determined in advance through experiments or the like. If the fuel cell system 1 is operated in a state where the anode pressure exceeds the allowable maximum upper limit value, the electrolyte membrane 111 may be deteriorated.
- step S42 the controller 4 calculates a film deterioration prevention upper limit value by adding a predetermined value ⁇ to the cathode pressure.
- the membrane deterioration prevention upper limit value is an upper limit value of the anode pressure that is set from the viewpoint of ensuring the durability of the electrolyte membrane 111, and the pressure difference between the cathode pressure and the anode pressure becomes excessive, and the electrolyte membrane 111 This is the upper limit value of the cathode pressure necessary to prevent the deterioration.
- step S43 the controller 4 refers to the table of FIG. 7 and calculates a pressure increase value necessary for preventing water clogging (flooding) in the anode gas flow path 121 based on the target output current.
- step S44 the controller 4 calculates the flooding prevention upper limit value by adding the pressure increase value calculated in step S42 to the lower limit pressure calculated in the lower limit pressure calculation process.
- the flooding prevention upper limit value is an upper limit value of the anode pressure set from the viewpoint of ensuring the output performance of the fuel cell stack.
- step S45 the controller 4 sets the smallest one of the allowable maximum upper limit value, the film deterioration preventing upper limit value, and the flooding preventing upper limit value as the anode pressure upper limit pressure.
- the allowable maximum upper limit value is set as the upper limit pressure of the anode pressure.
- the film deterioration preventing upper limit value is set as the anode pressure upper limit pressure. If the remaining two are smaller than the flooding prevention upper limit value and the allowable maximum upper limit value is equal to the film deterioration prevention upper limit value, either may be set as the upper limit pressure of the anode pressure.
- FIG. 8 is a flowchart for explaining the control target lower limit pressure calculation process.
- step S51 the controller 4 determines whether or not the film deterioration prevention lower limit value is set as the lower limit pressure. If the film deterioration prevention lower limit value is set as the lower limit pressure, the controller 4 performs the process of step S52. On the other hand, if the power generation request lower limit value is set as the lower limit pressure, the process of step S54 is performed.
- step S52 the controller 4 sets the lower limit side durability priority flag to 1.
- the lower limit side durability priority flag is a flag that is set to 1 when the film deterioration prevention lower limit value is set as the lower limit pressure, and the initial value is set to 0.
- the lower limit side durability priority flag is set to 1, in other words, it is when the lower limit pressure is set based on a request to ensure the durability of the electrolyte membrane 111, and thus the fuel cell stack 2. . Therefore, it is not desirable that the anode pressure falls below the lower limit pressure. Therefore, in this embodiment, when the lower limit side durability priority flag is set to 1, the control target lower limit pressure is obtained by adding the predetermined value ⁇ 1 to the lower limit pressure, and the anode pressure is prevented from falling below the lower limit pressure. .
- step S53 the controller 4 sets a value obtained by adding the predetermined value ⁇ 1 to the lower limit pressure as the control target lower limit pressure.
- step S54 the controller 4 sets the lower limit durability priority flag to 0.
- the lower limit side durability priority flag When the lower limit side durability priority flag is set to 0, it is when the power generation request lower limit value is set as the lower limit pressure. In other words, based on a request to ensure the output performance of the fuel cell stack 2. This is when the lower limit pressure is set.
- the function (drainage performance) of discharging the liquid water in the anode gas channel 121 to the outside of the channel becomes higher as the differential pressure (pulsation width) between the upper limit pressure and the lower limit pressure is larger.
- the drainage performance of the fuel cell stack 2 decreases, flooding is likely to occur and the output performance of the fuel cell stack 2 decreases.
- the control target lower limit pressure is obtained by subtracting the predetermined value ⁇ 2 from the lower limit pressure, and the anode pressure is surely reduced to the lower limit pressure.
- step S55 the controller 4 sets a value obtained by subtracting the predetermined value ⁇ 2 from the lower limit pressure as the control target lower limit pressure.
- FIG. 9 is a flowchart for explaining the control target upper limit pressure calculation process.
- step S61 the controller 4 determines whether either the allowable maximum upper limit value or the film deterioration preventing upper limit value is set as the upper limit pressure. If either the allowable maximum upper limit value or the film deterioration preventing upper limit value is set as the upper limit pressure, the controller 4 performs the process of step S62. On the other hand, if the flooding prevention upper limit value is set as the upper limit pressure, the process of step S64 is performed.
- step S62 the controller 4 sets the upper limit side durability priority flag to 1.
- the upper limit durability priority flag is a flag that is set to 1 when either the allowable maximum upper limit value or the film deterioration preventing upper limit value is set as the upper limit pressure, and the initial value is set to 0.
- the upper limit side durability priority flag is set to 1, in other words, when the upper limit pressure is set based on a request to ensure the durability of the electrolyte membrane 111 and, consequently, the fuel cell stack 2. . Therefore, it is not desirable that the anode pressure exceeds the upper limit pressure. Therefore, in the present embodiment, when the upper limit durability priority flag is set to 1, a value obtained by subtracting the predetermined value ⁇ 1 from the upper limit pressure is set as the control target upper limit pressure, and the anode pressure is prevented from exceeding the upper limit pressure. .
- step S63 the controller 4 sets a value obtained by subtracting the predetermined value ⁇ 1 from the upper limit pressure as the control target upper limit pressure.
- the predetermined value ⁇ 1 is larger than the predetermined value ⁇ 1. The reason will be described later with reference to FIG.
- step S64 the controller 4 sets the upper limit durability priority flag to 0.
- the flooding prevention upper limit value is set as the upper limit pressure. In other words, flooding is prevented and the output performance (drainage) of the fuel cell stack 2 is prevented.
- the upper limit pressure is set based on a request to ensure performance. Therefore, in such a case, it is a problem that the anode pressure cannot be increased to the upper limit pressure, and it is desired to reliably increase the anode pressure to the upper limit pressure. Therefore, in this embodiment, when the durability flag is set to 0, the control target upper limit pressure is obtained by adding the predetermined value ⁇ 2 to the upper limit pressure, and the anode pressure is reliably increased to the upper limit pressure.
- step S65 the controller 4 sets the upper limit pressure plus a predetermined value ⁇ 2 as the control target upper limit pressure.
- the predetermined value ⁇ 2 is set to a value smaller than the predetermined value ⁇ 2. The reason will be described later with reference to FIG.
- FIG. 10 is a flowchart for explaining the pulsation operation processing.
- step S71 the controller 4 determines whether or not the step-down voltage flag is set to 1.
- the step-down flag is a flag that is set to 1 during the anode pressure reduction process, and the initial value is set to 0.
- step S72 the controller 4 performs an anode pressure increasing process. Details of the boosting process will be described later with reference to FIG.
- step S73 the controller 4 performs the anode pressure reduction process. Details of the step-down process will be described later with reference to FIG.
- FIG. 11 is a flowchart for explaining the anode pressure increasing process.
- step S721 the controller 4 refers to the table of FIG. 12 and calculates the rate of change in pressure (inclination of the target anode pressure) when increasing the anode pressure based on the target output current.
- the step-up change rate is increased as the target output current is larger, because the amount of moisture transmitted from the cathode side to the anode side increases as the target output current is larger. It is.
- step S722 the controller 4 determines whether or not the upper limit durability priority flag is set to 1. If the upper limit durability priority flag is set to 1, the controller 4 performs the process of step S723. On the other hand, if the upper limit side durability priority flag is set to 0, the process of step S727 is performed.
- step S723 the controller 4 sets the target anode pressure so that the anode pressure increases from the control target lower limit pressure toward the control target upper limit pressure at a desired pressure increase rate, so that the anode pressure follows the target anode pressure. Adjust the opening of the pressure regulator.
- step S724 the controller 4 determines whether or not the anode pressure is equal to or higher than the control target upper limit pressure. If the anode pressure is less than the control target upper limit pressure, the controller 4 ends the current process. On the other hand, if the anode pressure is equal to or higher than the control target upper limit pressure, the process of step S725 is performed to end the pressure increasing process.
- the anode pressure is increased to the upper limit pressure by ending the pressure increasing process when the anode pressure reaches the control target upper limit pressure lower than the upper limit pressure. Can be suppressed.
- step S725 the controller 4 decreases the target anode pressure to the control target lower limit pressure, and ends the pressure increasing process.
- the controller 4 basically controls the pressure regulating valve to be fully closed.
- step S726 the controller 4 sets the step-down voltage flag to 1.
- the initial value of the step-down flag is set to zero.
- step S727 the controller 4 sets the target anode pressure so that the anode pressure increases from the lower limit pressure toward the control target upper limit pressure at a desired rate of increase in pressure, and adjusts the anode pressure to follow the target anode pressure. Adjust the opening of the pressure valve.
- the anode pressure can be reliably increased to the upper limit pressure by setting the control target upper limit pressure to a value higher than the upper limit pressure. Can do. Further, by terminating the pressure increasing process when the anode pressure reaches the upper limit pressure, anode gas is not supplied unnecessarily to increase the anode pressure. Therefore, deterioration of fuel consumption can be suppressed while ensuring the output performance (drainage performance) of the fuel cell stack 2.
- step S729 the controller 4 decreases the target anode pressure to the control target lower limit pressure, and ends the pressure increasing process.
- the controller 4 basically controls the pressure regulating valve to be fully closed.
- step S730 the controller 4 sets the step-down voltage flag to 1.
- FIG. 13 is a flowchart for explaining anode pressure reduction processing.
- step S731 the controller 4 determines whether or not the lower limit side durability priority flag is set to 1. If the lower limit side durability priority flag is set to 1, the controller 4 performs the process of step S732. On the other hand, if the lower limit side durability priority flag is set to 0, the controller 4 performs the process of step S734.
- step S732 the controller 4 determines whether or not the anode pressure has become equal to or lower than the control target lower limit pressure. If the anode pressure is higher than the control target lower limit pressure, the controller 4 ends the current process. On the other hand, if the anode pressure is equal to or lower than the control target lower limit pressure, the process of step S733 is performed to end the pressure reduction process.
- step S733 the controller 4 sets the step-down voltage flag to 0.
- the anode pressure is reduced to the lower limit pressure by terminating the pressure reduction process when the anode pressure reaches the control target lower limit pressure higher than the lower limit pressure. Can be suppressed.
- step S734 the controller 4 determines whether or not the anode pressure has become equal to or lower than the lower limit pressure. If the anode pressure is higher than the lower limit pressure, the controller 4 ends the current process. On the other hand, if the anode pressure is equal to or lower than the lower limit value, the process of step S735 is performed to end the pressure reduction process.
- step S735 the controller 4 sets the step-down voltage flag to 0.
- FIG. 14 is a time chart for explaining the operation of the pulsation operation control according to the present embodiment.
- FIG. 14 shows that when the film deterioration prevention upper limit value is set as the upper limit pressure and the film deterioration prevention lower limit value is set as the lower limit pressure, that is, the upper limit side durability priority flag and the lower limit side durability priority flag are set to 1, respectively. It is a time chart when it is set.
- the broken line is the target anode pressure
- the solid line is the anode pressure.
- the target anode pressure (broken line) is set so that the anode pressure increases from the control target lower limit pressure to the control target upper limit pressure at a desired rate of change in pressure, and the anode pressure ( The opening of the pressure regulating valve 33 is adjusted so that the solid line) follows the target anode pressure.
- the anode pressure is set to the upper limit by setting a value lower than the upper limit pressure as the control target upper limit pressure. Exceeding the pressure can be suppressed. Thereby, durability of the fuel cell stack 2 can be improved.
- the controller 4 ends the pressure increasing process and starts the pressure decreasing process.
- the controller 4 stops the supply of the anode gas from the high pressure tank 31 to the fuel cell stack 2 by fully closing the pressure regulating valve 33.
- the anode gas left in the anode gas flow path 121 inside the fuel cell stack 22 is consumed over time due to the electrode reaction of (1) described above.
- the anode pressure decreases by the amount of anode gas consumed.
- the pressure in the buffer tank 36 temporarily becomes higher than the pressure in the anode gas flow path 121, so that the anode gas flow path 121 extends from the buffer tank 36.
- the anode off-gas flows back into.
- the anode gas left in the anode gas channel 121 and the anode gas in the anode off-gas that has flowed back to the anode gas channel 121 are consumed over time, and the anode pressure further decreases.
- the controller 4 ends the pressure reduction process and starts the pressure increase process again.
- the anode pressure is set to the lower limit by setting a value higher than the lower limit pressure as the control target lower limit pressure.
- the pressure can be suppressed from falling below. Thereby, durability of the fuel cell stack 2 can be improved.
- the predetermined value ⁇ 1 is set to a value larger than the predetermined value ⁇ 1.
- the anode pressure increasing speed is higher than the anode pressure decreasing speed.
- the anode pressure can be reduced only by waiting for the anode gas to be consumed inside the fuel cell stack 2.
- the anode pressure may increase with good responsiveness, and the anode pressure may exceed the control target upper limit pressure and reach the upper limit pressure. Therefore, in the present embodiment, when the upper limit durability priority flag is set to 1, the predetermined value ⁇ 1 is set larger than the predetermined value ⁇ 1.
- FIG. 15 is a time chart for explaining the operation of the pulsation operation control according to the present embodiment.
- FIG. 15 shows that when the flooding prevention upper limit value is set as the upper limit pressure and the power generation request lower limit value is set as the lower limit pressure, that is, the upper limit side durability priority flag and the lower limit side durability priority flag are each set to 0. It is a time chart when.
- the broken line is the target anode pressure
- the solid line is the anode pressure.
- a value higher than the upper limit pressure by a predetermined value ⁇ 2 is set as the control target upper limit pressure.
- the target anode pressure (broken line) is set so that the anode pressure increases from the lower limit pressure to the control target upper limit pressure at a desired rate of change in pressure, and the anode pressure (solid line). Is adjusted so as to follow the target anode pressure.
- the control target upper limit pressure is set to a value higher than the upper limit pressure.
- the anode pressure can be reliably increased to the upper limit pressure. That is, even if a steady deviation occurs in the control and the anode pressure does not reach the control target upper limit pressure, the control target upper limit pressure is set to a value higher than the upper limit pressure. Can be reliably increased to the upper limit pressure. Thereby, the output performance (drainage performance) of the fuel cell stack 2 can be ensured.
- control target upper limit pressure is set to a value higher than the upper limit pressure
- the pressure increasing process is terminated when the anode pressure reaches the upper limit pressure, so the anode gas is supplied unnecessarily to increase the anode pressure. There is nothing. Therefore, deterioration of fuel consumption can be suppressed.
- the controller 4 ends the pressure increasing process and starts the pressure decreasing process.
- the controller 4 stops the supply of the anode gas from the high pressure tank to the fuel cell stack 2 by fully closing the pressure regulating valve 33.
- the controller 4 ends the pressure reduction process and starts the pressure increase process again.
- the power generation request lower limit value is set as the lower limit pressure
- a value lower than the lower limit pressure by a predetermined value ⁇ 2 is set as the control target lower limit pressure.
- the anode pressure can be reliably reduced to the lower limit pressure.
- the pulsation width (differential pressure between the upper limit pressure and the lower limit pressure) at the next pressure increase can be ensured, so that the liquid water in the anode gas channel 121 can be discharged out of the channel. Therefore, the output performance (drainage performance) of the fuel cell stack 2 can be improved.
- the predetermined value ⁇ 2 is set to a value smaller than the predetermined value ⁇ 2.
- the anode pressure increasing speed is higher than the anode pressure decreasing speed.
- the upper limit durability priority flag when the upper limit durability priority flag is set to 0, if the value of the predetermined value ⁇ 2 is large, the anode pressure excessively exceeds the upper limit pressure as the anode pressure is increased with good responsiveness. There is a fear. Therefore, in the present embodiment, when the upper limit side durability priority flag is set to 0, the predetermined value ⁇ 2 is made smaller than the predetermined value ⁇ 2.
- the target anode pressure is set so that the anode pressure is increased at a desired pressure increase rate from the control target lower limit pressure toward the control target upper limit pressure.
- the target anode pressure is set so that the anode pressure increases from the lower limit pressure toward the control target upper limit pressure at a desired rate of change in pressure increase.
- FIG. 16 is a diagram for explaining the effect obtained by setting the target anode pressure so that the anode pressure increases at a desired rate of change in pressure from the lower limit pressure toward the control target upper limit pressure.
- the target anode pressure When the target anode pressure is set so that the anode pressure is increased from the control target lower limit pressure to the control target upper limit pressure at a desired rate of change in pressure, as shown by a one-dot chain line in FIG. 16, the anode pressure is reduced to the lower limit pressure. After that, the target anode pressure becomes lower than the lower limit pressure for a while. Therefore, even after the anode pressure has decreased to the lower limit pressure, the pressure regulating valve 33 remains fully closed in order to cause the anode pressure to follow the target anode pressure. As a result, the anode pressure falls below the lower limit pressure, and undershoot occurs.
- the output current of the fuel cell stack 2 may be lower than the target output current. There is.
- the target anode pressure is set so that the anode pressure is increased at a desired pressure increase rate from the lower limit pressure to the control target upper limit pressure as in the present embodiment.
- the occurrence of such an undershoot can be suppressed. Therefore, it can suppress that the output current of a fuel stack becomes lower than a target output current, As a result, the output performance of the fuel cell stack 2 can be improved.
- the pressure (anode pressure) detected by the pressure sensor 34 provided in the anode gas supply passage 32 is used for the entire anode system including each anode gas flow path 121 and the buffer tank 36 inside the fuel cell stack 2. Substituting as pressure.
- FIG. 17 is a flowchart illustrating the boosting process according to the present embodiment.
- step S2721 the controller 4 sets the target anode pressure to the control target upper limit pressure.
- step S2722 the controller 4 determines whether or not a predetermined time has elapsed since the target anode pressure was set to the control target upper limit pressure.
- the controller 4 performs the process of step S725 if the predetermined time has elapsed since the target anode pressure was set to the control target upper limit pressure, and returns to the process of step S2722 if the predetermined time has not elapsed.
- step S2723 the controller 4 sets the target anode pressure to the upper limit pressure.
- step S2724 the controller 4 determines whether or not a predetermined time has elapsed since the target anode pressure was set to the upper limit pressure.
- the controller 4 performs the process of step S728 if the predetermined time has elapsed since the target anode pressure was set to the upper limit pressure, and returns to the process of step S2724 if the predetermined time has not elapsed.
- FIG. 18 is a flowchart illustrating the step-down processing according to the present embodiment.
- step S2731 the controller 4 sets the target anode pressure to the control target lower limit pressure.
- step S2732 the controller 4 determines whether or not a predetermined time has elapsed since the target anode pressure was set to the control target lower limit pressure.
- the controller 4 performs the process of step S733 if the predetermined time has elapsed since the target anode pressure was set to the control target lower limit pressure, and returns to the process of step S2731 if the predetermined time has not elapsed.
- step S2733 the controller 4 sets the target anode pressure to the lower limit pressure.
- step S2734 the controller 4 determines whether or not a predetermined time has elapsed since the target anode pressure was set to the lower limit pressure.
- the controller 4 performs the process of step S735 if the predetermined time has elapsed since the target anode pressure was set to the lower limit pressure, and returns to step S2733 if the predetermined time has not elapsed.
- the target anode pressure is held at the control target upper limit pressure for a predetermined time after the anode pressure reaches the control target upper limit pressure. It was decided to. Thereby, the pressure in the anode gas flow path 121 can be reliably increased to the control target upper limit pressure.
- the target anode pressure is held at the control target lower limit pressure for a predetermined time after the anode pressure reaches the control target lower limit pressure. Thereby, the pressure in the anode gas flow path 121 can be reliably lowered to the control target lower limit pressure.
- FIG. 19 is a time chart for explaining the operation of the pulsation operation control according to the present embodiment.
- the flooding prevention upper limit value is set as the upper limit pressure
- the power generation request lower limit value is set as the lower limit pressure
- the upper limit side durability priority flag and the lower limit side durability priority flag are each set to 0.
- the broken line is the target anode pressure
- the solid line is the anode pressure.
- the target anode pressure is changed from the control target upper limit pressure to the upper limit pressure.
- the target anode pressure was kept at the upper limit pressure for a predetermined time. Thereby, the pressure in the anode gas flow path 121 can be reliably increased to the upper limit pressure.
- the target anode pressure is changed from the control target upper limit pressure to the upper limit pressure, and then the target anode pressure is held at the upper limit pressure for a predetermined time.
- the target anode pressure is changed from the control target upper limit pressure to the upper limit pressure, and then the target anode pressure is held at the upper limit pressure for a predetermined time.
- the target anode pressure is changed from the control target lower limit pressure to the lower limit pressure.
- the target anode pressure was kept at the lower limit pressure for a predetermined time. Thereby, the pressure in the anode gas flow path 121 can be reliably lowered to the lower limit pressure.
- the target anode pressure is maintained at the control target lower limit pressure for a predetermined time as when the lower limit side durability priority flag is set to 1. Instead, the target anode pressure is maintained at the lower limit pressure for a predetermined time after the target anode pressure is changed from the control target lower limit pressure to the lower limit pressure. Thereby, it can suppress that an anode pressure falls below a minimum pressure during a holding
- the buffer tank 36 as a space for storing the anode off gas is provided in the anode gas discharge passage 35.
- the internal manifold of the fuel cell stack 22 may be used as a space instead of the buffer tank 36.
- the internal manifold referred to here is a space inside the fuel cell stack 2 where the anode off-gas that has finished flowing through the anode gas flow path 121 of each separator is collected. And discharged.
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Abstract
Description
燃料電池は電解質膜をアノード電極(燃料極)とカソード電極(酸化剤極)とで挟み、アノード電極に水素を含有するアノードガス(燃料ガス)、カソード電極に酸素を含有するカソードガス(酸化剤ガス)を供給することによって発電する。アノード電極及びカソード電極の両電極において進行する電極反応は以下の通りである。
カソード電極 : 4H+ +4e- +O2 →2H2O …(2)
次に、本発明の第2実施形態について説明する。本発明の第2実施形態は、アノード圧を一定時間保持する点で第1実施形態と相違する。以下、その相違点について説明する。なお、以下に示す各実施形態では前述した第1実施形態と同様の機能を果たす部分には、同一の符号を用いて重複する説明を適宜省略する。
Claims (14)
- 燃料電池に供給するアノードガスの圧力を制御する制御弁と、
前記燃料電池に供給するアノードガスの圧力を検出する圧力検出部と、
アノードガスの目標圧力として、目標上限圧と目標下限圧とを周期的に繰り返し設定する目標圧力設定部と、
前記圧力検出手段によって検出したアノードガスの圧力と、前記目標圧力と、に基づいて、前記制御弁をフィードバック制御してアノードガスの圧力を制御する圧力制御部と、
前記燃料電池の耐久性能に基づいて設定されるアノードガスの上限値と、前記燃料電池の出力性能に基づいて設定されるアノードガスの上限値と、のうち、小さいものをアノードガスの上限圧として設定する上限圧設定部と、
を備え、
前記目標圧力設定部は、
アノードガスの上限圧として、前記燃料電池の耐久性能に基づいて設定されたアノードガスの上限値が選択されたときは、その上限値よりも小さい値を目標上限圧として設定し、前記燃料電池の出力性能に基づいて設定されたアノードガスの上限値が選択されたときは、その上限値又はその上限値よりも大きい圧力を目標上限圧として設定する、
燃料電池システム。 - 前記圧力制御部は、
アノードガスの上限圧として、前記燃料電池の出力性能に基づいて設定されたアノードガスの上限値が選択された場合は、アノードガスの圧力が上限圧に達したときに、アノードガスの昇圧を終了する、
請求項1に記載の燃料電池システム。 - 前記燃料電池の耐久性能に基づいて設定されるアノードガスの圧力の下限値と、前記燃料電池の出力性能に基づいて設定されるアノードガスの圧力の下限値と、のうち、大きいものをアノードガスの下限圧として設定する下限圧設定手段を備え、
前記目標圧力設定部は、
アノードガスの下限圧として、前記燃料電池の耐久性能に基づいて設定された下限値が選択されたときは、その下限値よりも大きい値を目標下限圧として設定し、前記燃料電池の出力性能に基づいて設定された下限値が選択されたときは、その下限値よりも小さい値を目標下限圧として設定する、
請求項1又は請求項2に記載の燃料電池システム。 - 前記圧力制御部は、
アノードガスの下限圧として、前記燃料電池の出力性能に基づいて設定された下限値が選択された場合は、アノードガスの圧力が下限圧に達したときに、アノードガスの降圧を終了する、
請求項3に記載の燃料電池システム。 - アノードガスの上限圧として、前記燃料電池の出力性能に基づいて設定された上限値が選択されたときの目標上限圧とその上限値との差分は、アノードガスの下限圧として、前記燃料電池の出力性能に基づいて設定された下限値が選択されたときのその下限値と目標下限圧との差分よりも小さい、
請求項3又は請求項4に記載の燃料電池システム。 - 前記圧力制御部は、
前記燃料電池の運転状態に応じて算出される昇圧変化率で、アノードガスの圧力を昇圧させる、
請求項3から請求項5までのいずれか1つに記載の燃料電池システム。 - 前記圧力制御部は、
アノードガスの上限圧として、前記燃料電池の出力性能に基づいて設定された上限値が選択され、アノードガスの下限圧として、前記燃料電池の出力性能に基づいて設定された下限値が選択されている場合は、アノードガスの圧力を昇圧させるときに、下限圧から目標上限圧に向けて、前記昇圧変化率でアノードガスの圧力を昇圧させる、
請求項6に記載の燃料電池システム。 - 前記圧力制御部は、
アノードガスの上限圧として、前記燃料電池の出力性能に基づいて設定された上限値が選択された場合は、アノードガスの圧力が上限圧に達したときに、アノードガスの目標圧力を上限圧に所定時間保持してからアノードガスの昇圧を終了する、
請求項1に記載の燃料電池システム。 - 前記圧力制御部は、
アノードガスの下限圧として、前記燃料電池の出力性能に基づいて設定された下限値が選択された場合は、アノードガスの圧力が下限圧に達したときに、前記アノードガスの目標圧力を目標下限圧に所定時間保持してからアノードガスの降圧を終了する、
請求項3に記載の燃料電池システム。 - 前記燃料電池の耐久性能に基づいて設定されるアノードガスの圧力の上限値は、前記燃料電池の仕様に応じて定まる前記燃料電池に供給可能なガス圧力の最大値である、
請求項1に記載の燃料電池システム。 - 前記燃料電池の耐久性能に基づいて設定されるアノードガスの圧力の上限値は、前記燃料電池に供給されるアノードガスの圧力とカソードガスの圧力との差圧の許容最大値に基づき設定される値である、
請求項1に記載の燃料電池システム。 - 前記燃料電池の出力性能に基づいて設定されるアノードガスの圧力の上限値は、前記燃料電池内のアノードガス流路に存在する水分をアノードガス流路外に排出するために必要な圧力上昇値に基づき設定される値である、
請求項1に記載の燃料電池システム。 - 前記燃料電池の耐久性能に基づいて設定されるアノードガスの圧力の下限値は、前記燃料電池に供給されるアノードガスの圧力とカソードガスの圧力との差圧の許容最大値に基づき設定される値である、
請求項3に記載の燃料電池システム。 - 前記燃料電池の出力性能に基づいて設定されるアノードガスの圧力の下限値は、前記燃料電池の負荷に応じて定まる目標出力を出力可能なアノードガスの圧力の最低値である、
請求項3に記載の燃料電池システム。
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CA2867426A CA2867426C (en) | 2012-03-15 | 2013-03-13 | Fuel cell system with setup of upper pressure of anode gas |
JP2014504970A JP6052282B2 (ja) | 2012-03-15 | 2013-03-13 | 燃料電池システム |
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Also Published As
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JPWO2013137334A1 (ja) | 2015-08-03 |
JP6052282B2 (ja) | 2016-12-27 |
EP2827421A4 (en) | 2015-03-11 |
US9853316B2 (en) | 2017-12-26 |
EP2827421A1 (en) | 2015-01-21 |
CA2867426A1 (en) | 2013-09-19 |
CA2867426C (en) | 2017-02-28 |
EP2827421B1 (en) | 2017-07-05 |
CN104170141B (zh) | 2017-05-03 |
US20150056533A1 (en) | 2015-02-26 |
CN104170141A (zh) | 2014-11-26 |
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