WO2009017139A1 - 燃料電池システム及びその制御方法 - Google Patents
燃料電池システム及びその制御方法 Download PDFInfo
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- WO2009017139A1 WO2009017139A1 PCT/JP2008/063624 JP2008063624W WO2009017139A1 WO 2009017139 A1 WO2009017139 A1 WO 2009017139A1 JP 2008063624 W JP2008063624 W JP 2008063624W WO 2009017139 A1 WO2009017139 A1 WO 2009017139A1
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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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04037—Electrical heating
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- H—ELECTRICITY
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- 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
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04268—Heating of fuel cells during the start-up of the fuel cells
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M16/00—Structural combinations of different types of electrochemical generators
- H01M16/003—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers
- H01M16/006—Structural combinations of different types of electrochemical generators of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers of fuel cells with rechargeable batteries
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04335—Temperature; Ambient temperature of cathode reactants at the inlet or inside the fuel cell
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- 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
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04358—Temperature; Ambient temperature of the coolant
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- H01M8/00—Fuel cells; Manufacture thereof
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- 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
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04365—Temperature; Ambient temperature of other components of a fuel cell or fuel cell stacks
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- 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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- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04395—Pressure; Ambient pressure; Flow of cathode reactants at the inlet or inside the fuel cell
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- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
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- H01M8/04537—Electric variables
- H01M8/04544—Voltage
- H01M8/04559—Voltage of fuel cell stacks
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- H01M8/04537—Electric variables
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- H01M8/04567—Voltage of auxiliary devices, e.g. batteries, capacitors
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- H01M8/04873—Voltage of the individual fuel cell
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- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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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
- Y02E60/10—Energy storage using batteries
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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 that supplies a necessary amount of heat.
- a fuel cell generates electric energy by reacting hydrogen gas as a fuel gas with an oxidant gas.
- Fuel cell systems mounted on automobiles and the like are controlled so that the hydrogen energy written in the fuel cells is converted into electric energy at high efficiency (hereinafter referred to as high-efficiency power generation). For this reason, fuel cells that generate high-efficiency power have a low rate of conversion from hydrogen energy to heat energy, and generate less heat.
- a fuel cell system including a conventional heating device includes a heating unit that heats a cooling medium in a cooling medium circulation path of the fuel cell in order to supply heat necessary for heating (hereinafter referred to as heating required heat), and And a heat exchanger for supplying heat used for air conditioning heating (see, for example, Patent Document 2 or Patent Document 3).
- heating required heat heat necessary for heating
- heat exchanger for supplying heat used for air conditioning heating
- Patent Document 1 Japanese Patent Laid-Open No. 2 0 4-3 0 9 7 9
- Patent Document 2 Japanese Patent Application Laid-Open No. 2 00 4-3 1 1 2 2 9
- Patent Document 3 Japanese Patent Application Laid-Open No. 2007-0 3 8 95 2 Disclosure of Invention
- the present invention requires a fuel cell that generates power using fuel gas and oxidant gas as reaction gas, current control means for controlling the current of the fuel cell, voltage control means for controlling the voltage of the fuel cell, and a fuel cell system.
- a calorific value control means for controlling the calorific value by calculating the required heat quantity and determining the current target value of the current control means and the voltage target value of the voltage control means so as to generate the calculated necessary heat quantity, and A fuel cell system provided.
- a heating device that uses heat generated by the fuel cell as a heat source is provided, and the required heat amount includes a heating required heat amount required by the operating heating device.
- the necessary heat amount includes a required heat amount of the machine required for warming up the fuel cell.
- the necessary heat quantity includes a necessary heat quantity necessary for maintaining the temperature of the fuel cell system at a predetermined temperature.
- control means is preferably controlled by low-efficiency power generation in which the power generation efficiency is lower than the high-efficiency power generation of the fuel cell.
- the voltage control means is a DCZDC converter
- the current control means is a reaction gas supply means.
- the present invention also provides a fuel cell that generates power using fuel gas and oxidant gas as reaction gas, a secondary battery that discharges or discharges the output of the fuel cell, and controls the voltage of the secondary battery.
- a fuel cell system having a voltage control means the required amount of heat required by the fuel cell system and the required output are calculated, and the fuel cell is generated with high efficiency based on the calculated required amount of heat and the required output.
- High-efficiency power generation mode the first low-efficiency power generation mode in which the power generation efficiency is lower than the high-efficiency power generation with the voltage lower limit value as the first voltage lower limit value, and the voltage lower limit value lower than the first voltage lower limit value.
- a fuel cell system comprising control means for controlling a fuel cell so as to operate in any one of a second low-efficiency power generation mode that is a two-voltage lower limit value.
- a fuel cell comprising: a fuel cell that generates power using a fuel gas and an oxidant gas as a reaction gas; and a voltage control unit that controls the voltage of the fuel cell.
- the high-efficiency power generation mode in which the fuel cell generates power with high efficiency, and the first low-efficiency with lower power generation efficiency than the high-efficiency power generation with the voltage lower limit as the second voltage lower limit
- the fuel cell system includes a control unit that controls the fuel cell to operate in any one of the power generation modes.
- a heating device that uses heat generated by the fuel cell as a heat source is provided, and the required heat amount includes a heating required heat amount required by the operating heating device.
- the necessary heat generation amount includes a heat amount necessary for maintaining the temperature of the fuel cell at a predetermined temperature.
- the necessary heat amount includes a necessary heat amount necessary for warming up the fuel cell.
- the control means preferably increases the amount of the reaction gas supplied to the fuel cell when the first low efficiency power generation mode or the second low efficiency power generation mode is shifted to the high efficiency power generation mode. is there.
- the present invention also provides a first step for determining the required heat amount required by the fuel cell system and the required required output, and the required heat amount and required output in the current-voltage curve of the fuel cell determined by the supply state of the reaction gas.
- the fuel cell system is equipped with a heating device that uses the heat generated by the fuel cell as a heat source, and the required amount of heat is the amount of heat required by the operating heating device and the amount of heat required for warming up the fuel cell. It is preferable to include.
- the required output includes a driving force required by a vehicle on which the fuel cell system is mounted and an output required by an auxiliary device of the fuel cell system.
- the fuel cell system preferably includes a converter for setting the operating point.
- FIG. 1 is a diagram showing the configuration of the fuel cell system according to the first embodiment.
- Fig. 2 is a diagram showing a map of the amount of heat required for heating and the amount of heat exchanged by the heat exchanger.
- Fig. 3 is a diagram showing a map of heat required for warm-up.
- FIG. 4 is a diagram showing a maintenance required heat quantity map for maintaining the fuel cell at a predetermined temperature.
- Figure 5 shows the IV characteristics of the fuel cell.
- Figure 6 shows the fuel cell operating point based on the required heat and required output.
- FIG. 7 is a flowchart according to the first embodiment.
- FIG. 8 is a diagram showing a configuration of a fuel cell system according to the second embodiment.
- FIG. 9 is a flowchart according to the second embodiment. Explanation of symbols
- the fuel cell system is applied to a fuel cell vehicle.
- the following embodiments are merely examples of the application form of the present invention, and do not limit the present invention.
- FIG. 1 shows a fuel cell system 10.
- the fuel cell system 10 of the first embodiment includes a fuel cell 100, a hydrogen system 20 that supplies fuel gas to the fuel cell, an air system 30 0 that supplies oxidant gas to the fuel cell, fuel It is composed of a cooling system 400 for cooling the battery, a load system 50 0 using the electric energy of the fuel cell, and a control unit 60 0 for controlling the fuel cell system.
- the fuel cell 100 for example, a polymer electrolyte fuel cell is used.
- a fuel cell stack in which a plurality of unit cells are stacked is used. Electricity is generated by supplying hydrogen gas as fuel gas and air as oxidant gas.
- a current sensor 10 0 2 for detecting the current value of the fuel cell during power generation
- a voltage sensor 10 0 4 for detecting the voltage across the terminals of the fuel cell
- a temperature sensor 10 0 for measuring the temperature of the fuel cell It has.
- Each detected value is input to the control unit 600.
- the hydrogen system 200 for supplying the fuel gas to the fuel cell is a system including a path for hydrogen gas supplied from the hydrogen tank 20 2 having hydrogen as the fuel gas to the fuel cell 100.
- the hydrogen gas supplied from the hydrogen tank 20 2 is in order of a pressure reducing valve 20 4 for reducing the pressure of the hydrogen gas to a predetermined pressure, a pressure sensor 2 0 6 for measuring the pressure of the hydrogen gas, and a hydrogen supply path 2 0 8 in this order. Is then supplied to the hydrogen gas flow path on the anode side of the fuel cell 100.
- the detected hydrogen gas pressure value is input to the control unit 600, which controls the pressure reducing valve 204 so that the hydrogen gas pressure value becomes a predetermined value.
- This hydrogen gas is used for power generation of the fuel cell 100, but not all the supplied amount is consumed, and unreacted hydrogen gas is discharged from the fuel cell 100.
- the exhaust hydrogen gas usually has an increased content of water, which is a reaction product in the fuel cell.
- the discharged hydrogen gas passes through the hydrogen gas circulation path 2 1 2 that joins the hydrogen pump 2 1 0 and the hydrogen supply path 2 0 8 that drive the hydrogen gas, and flows through the hydrogen supply path 2 0 8 To join.
- the hydrogen pump 210 is shown in the present embodiment, but an ejector may be used. That is, since the hydrogen gas from the hydrogen tank has a sufficient pressure, the circulation hydrogen gas can be accompanied by the flow of the hydrogen gas from the hydrogen tank by using the execution.
- the air system 300 that supplies the oxidant gas to the fuel cell is a route of the oxidant gas for supplying and discharging air (particularly, oxygen present in the air) to the fuel cell.
- the air sucked from the suction port 30 2 includes a temperature sensor 3 0 4 for detecting the temperature of the air, an air pump 3 0 6 for pressurizing the air, and a pressure sensor 3 0 8 for detecting the pressure of the pressurized air.
- the fuel cell 100 is supplied to the gas flow path on the cathode side.
- the detected air temperature and air pressure are input to the control unit 600.
- the air After the air is used for power generation of the fuel cell 100, it is discharged to the outside through the pressure regulating valve 30.
- the air system for supplying air to the fuel cell 100 may be provided with a humidifier for humidifying the air.
- the cooling system 400 for cooling the fuel cell is a cooling medium path for cooling the heat generated by the power generation of the fuel cell 100.
- a cooling liquid is used as the cooling medium.
- the cooling medium discharged from the fuel cell 10 0 is a temperature sensor 40 0 2 that detects the temperature of the cooling medium, a three-way valve 4 0 4 that controls the flow rate of the cooling medium to the heating heat exchange path 1 6, Evening bypass path 4 2 0 Three-way valve that controls the flow rate of the cooling medium 4 0 6, Raje evening that cools the cooling medium 4 0 8, Cooling medium pump that drives the circulation of the cooling medium 4
- the exchange path 4 1 6 branches from the cooling medium circulation path so as to bypass the Raje evening 4 0 8, and uses the heat source of the cooling medium heated by the fuel cell 1 0 0 as the heat source of heating 4 1 After passing through 8, it merges with the coolant circulation path 4 1 4 again.
- the Laje overnight bypass path 4 2 0 branches from the coolant circulation path 4 1 4 so as to bypass the Raje evening 4 0 8, and joins the coolant circulation path 4 1 4 again.
- the three-way valve 4 0 4 on the heat exchange path for heating and the three-way valve 4 0 6 on the Raje overnight path are controlled by the control unit 60 0, respectively, to control the flow rate of the cooling medium.
- the detected temperature of the cooling medium is input to the control unit 600.
- the heat exchanger 4 1 8 functions as a heat source for the heating device 4 2 2.
- the heating device 4 2 2 includes a heating temperature operation unit that can arbitrarily or automatically set the heating temperature. Moreover, it is preferable that the heating device 4 2 2 is provided with a temperature sensor that detects the temperature in the vehicle interior to be heated. The detected temperature in the passenger compartment is input to the control unit 600.
- the load system that uses the electric energy of the fuel cell is connected to the fuel cell 10 0 0 and the drive motor that converts DC current to AC current 5 0 2 and the drive motor that drives the vehicle 5 0 4 is connected.
- Inverter 502 has a three-phase bridge circuit composed of, for example, six transistors, and converts DC current into AC current by the switching action of ⁇ ranges.
- the inverter 50 2 controls the output torque and the number of revolutions of the drive motor 50 4 by controlling the alternating current in response to the request of the control unit 600.
- Capacitors 5 1 4 are provided to absorb surplus output from the fuel cell.
- the load system 5 0 0 of the fuel cell is 0 so that the drive motor 5 0 2 and the drive motor 5 0 4 are in parallel.
- a converter 5 0 6, a secondary battery 5 0 8, and auxiliary equipment 5 1 0 are provided.
- the secondary battery 50 8 includes a voltage sensor 51 2 that measures the voltage of the secondary battery 5 08.
- the DC / DC converter 5 0 6 controls the voltage value in the power generation of the fuel cell 10 0 0, and charges by controlling the voltage of the fuel cell 1 0 0 to the voltage of the secondary battery 5 0 8. It has a function.
- Examples of the secondary battery 508 include a lead storage battery, a nickel metal hydride storage battery, and a lithium ion battery.
- the auxiliary machinery 5 10 is connected to the secondary battery 5 0 8 and functions by consuming electric power supplied from the secondary battery 5 0 8.
- Auxiliary machines 5 1 0 in the system of the present embodiment include a hydrogen pump 2 1 0, an air pump 3 0 6, a cooling medium pump 4 1 0, a humidifier, and the like. 0 Power is supplied from 8.
- the control unit 60 that controls the fuel cell system controls the fuel cell system 10 according to the required heat amount required by the fuel cell system 10 and the required output required.
- the required amount of heat required is the amount of heat required by the heating device 4 2 2 as a heat source, and the amount of heat required to warm up the fuel cell 1 0 0 to the optimal power generation temperature (hereinafter referred to as the amount of heat required for warm-up). ) and so on.
- the required output includes the required output of the load system drive motor 50 4 and the required output of the auxiliary machinery 5 10.
- the necessary heat quantity is calculated by the control unit 600.
- the amount of heat required for heating is calculated with reference to a map of the amount of heat required for heating determined in advance based on the outside air temperature.
- the heating required heat amount map is created in consideration of the cabin thermal insulation coefficient determined by the volume of the cabin and the presence or absence of insulation. It is also created taking into account the set temperature of the heating device 4 2 2 and the temperature in the passenger compartment.
- Fig. 2 shows a map of the amount of heat required for heating 60 2 and the amount of heat 6 0 4 exchanged by the heat exchanger based on the outside air temperature under specified conditions. In the map of FIG. 2, for example, in the region where the temperature is 116 ° C.
- the required heating heat amount 60 2 is larger than the heat amount 6 0 4 exchanged by the heat exchanger.
- the amount of heat supplied to the heating device 4 2 2 is limited by the amount of heat exchanged by the heat exchanger 4 1 8. For this reason, sufficient heat cannot be supplied to the heating system in the following region, where the temperature is 116. Therefore, in the region of ⁇ 16 ° C. or lower, it is preferable to cause the fuel cell 100 to generate low-efficiency power, which will be described later, to increase the heat generation amount so that the shortage of heat can be supplied constantly. is there.
- the required amount of heat for the dredger is the required amount of heat for the dredger determined in advance based on the outside air temperature. 4 Calculated with reference to the map.
- Figure 3 shows a map of the required heat capacity of the machine based on the outside air temperature under specified conditions.
- the amount of heat required for warm-up is preferably created in consideration of the temperature of the fuel cell 100 and the temperature of the cooling medium in addition to the outside air temperature.
- the fuel cell 100 After dredging operation, the fuel cell 100 is at a predetermined temperature (around 80 degrees). Since the temperature of the fuel cell 100 after warm-up (around 80 degrees) is higher than the outside air temperature, the amount of heat that the fuel cell itself has is dissipated. In particular, under freezing conditions, the amount of heat released from the fuel cell 100 becomes greater than the amount of heat generated during normal power generation, and the fuel cell may not be maintained at a predetermined temperature. Therefore, the required heat quantity of the fuel cell after warming up must include the required heat quantity necessary for maintaining the fuel cell system 10 including the fuel cell at a predetermined temperature. A map of the required heat quantity for maintenance in the fuel cell is shown. The necessary heat quantity map in FIG.
- the control unit 600 controls the three-way valves 4 0 4, 4 0 6 of the coolant circulation path 4 1 4.
- the three-way valve 4 0 4 is controlled so that the cooling medium circulates through the heat exchange path 4 1 6 for heating. If heating is not required, close the three-way valve 4 0 4 leading to the heating heat exchange path so that the cooling medium does not circulate in the heating heat exchange path. If the cooling medium is not warmed, the three-way valve 4 0 6 is controlled so as to bypass the Raje evening 4 0 8 so that the cooling medium is not cooled, and the temperature of the cooling medium becomes high.
- the three-way valve 4 06 is controlled so that the cooling medium passes through the Lager overnight 4 0 8.
- the requested output is calculated by the control unit 600.
- the output request of the drive motor is calculated from, for example, a request from the accelerator pedal and a vehicle speed detected by the vehicle speed sensor.
- Auxiliary machinery 5 1 0 output demand is: hydrogen pump 2 1 0 ⁇ air pump 3 0 6 ⁇ cooling medium pump 4 1 0 Calculated by totaling the outputs required for TJP2008 / 063624.
- control unit 600 is connected to the fuel cell 1 by D CZD C
- FIG. Figure 5 shows the fuel cell current-voltage curve (hereinafter referred to as I-V curve) 6 0 8 and the operating point A on the I–V curve, which were experimentally determined.
- Fuel cell high-efficiency power generation is defined as follows: Fuel cell 1 0 0 ⁇ Auxiliary machinery 5 1 0 and other fuel cell systems 1 0 Shows the optimal power generation efficiency of the entire I 1 V curve 6 0 8 There is an operating point.
- the optimum power generation efficiency refers to the power generation efficiency at or near the maximum value or maximum value of power generation efficiency.
- the current value is I 1 and the voltage value is V I.
- the power generation efficiency of a fuel cell is the ratio of the output of the fuel cell to the hydrogen energy input to the fuel cell.
- the hydrogen energy input is the product of the current value I 1 and the electromotive voltage Vma x of the fuel cell.
- the electromotive force Vm a X of the fuel cell is calculated as follows. For example, if a fuel cell has 400 unit cells stacked, the electromotive voltage of the unit cell is 1.23 V, so the electromotive voltage of the fuel cell is 4 9 2 V Is required.
- the output of the fuel cell is the product of the current value I 1 and the voltage value V 1 (I 1 XV 1).
- the calorific value of the fuel cell is the energy obtained by subtracting the output of the fuel cell from the input hydrogen energy (I I X Vma x-I 1 X V 1).
- the voltage value of high-efficiency power generation is controlled in the range of 50% to 70% of the electromotive voltage of the fuel cell.
- the current value I is low voltage with respect to the operating point A on the I-V curve 6 0 8 of high efficiency power generation, and the voltage value V 2 ⁇ ⁇ current The operating point is controlled to operating point B which is 2. This results in a state of low-efficiency power generation in which the power generation efficiency is lower than that of high-efficiency power generation.
- the reaction in the force sword is hindered, and the current value decreases at a predetermined voltage value.
- the voltage is first controlled by the DCZDC converter.
- the I 1 V curve may be changed first by controlling the air supply amount by the air pump 310.
- the first low-efficiency power generation mode is defined as low-efficiency power generation in which the voltage value determined from the output torque request of the drive motor is the first voltage lower limit value and the first voltage lower limit value is the voltage lower limit value.
- the DCZDC converter is controlled so that the voltage of the fuel cell is equal to or higher than the first voltage lower limit value according to the required output and the required heat, and the current value is changed by changing the amount of air supplied to the fuel cell. Control.
- the voltage value of the fuel cell 10 0 is determined from the voltage value determined by the control limit of the DC / DC converter (for example, 15 V), and the voltage value determined by the output torque request of the drive motor 50 4 (for example, 1 2 0 V) It is desirable to control within this range.
- the voltage value determined from the control limit is the second voltage lower limit value.
- the lower limit value of the voltage can be set as the second lower limit value of the voltage to increase the amount of heat generation.
- Low-efficiency power generation with the second voltage lower limit as the voltage lower limit is designated as the second low-efficiency power generation mode.
- the required heat quantity P and the required output Q can be satisfied at the same time.
- step S 1 0 The heating device of the fuel cell system 10 is operating, and the calorific value of the fuel cell 100 is used as a heat source for the heating device.
- the heating set temperature is inputted by the heating temperature operation section.
- the amount of heat required for heating is calculated using a map (step S 1 0 3).
- the amount of heat required for warming up the fuel cell is calculated (step S 1 0 5).
- the total value of the heating required heat quantity and the machine required heat quantity is the required heat quantity (Q a). If the system has reached the predetermined temperature, the heat required for maintenance is calculated instead of step S 1 0 5.
- step S 1 0 7 the required output of the total value of the output request of the drive motor and the output request of the auxiliary devices of the fuel cell system 10 is calculated by the control unit 60 (step S 1 0 7).
- the operating point of the fuel cell that can supply the output of the calculated required output and is on the I-V curve in high-efficiency power generation is obtained.
- Q b normal calorific value
- step S 1 1 5 it is determined whether there is an output torque request for driving mode. If it is determined that there is a drive torque output torque request (step S1 15: YES), the first low-efficiency power generation mode in which the lower limit value of the voltage is allowed up to the first voltage lower limit value (Ste S 1 1 7).
- the current target value determines the voltage target value that satisfies the required heat amount and the required output within the allowable voltage range (step S 1 1 9).
- the duty ratio of the DC / DC converter is adjusted so that the voltage of the fuel cell 100 becomes the voltage target value (step S 1 2 1). Further, the air supply amount is controlled by the air pump so that the current of the fuel cell 100 becomes the current target value (step S 1 2 1).
- step S 1 15: NO the second low-efficiency power generation mode in which the lower limit value of the voltage is allowed up to the second voltage lower limit value is set (step S1 15: NO).
- step S 1 2 3 The current target value determines the voltage target value within the allowable voltage range and satisfying the required heat and required output (step S 1 2 5).
- the duty ratio of the D CZD C comparator is controlled so that the voltage of the fuel cell 100 becomes the voltage target value (step S 1 2 7).
- the air supply amount is controlled by the air pump so that the current of the fuel cell 100 becomes the current target value (step S 1 2 7).
- step S 1 1 1 After step 1 2 1 or step 1 2 7 has passed a fixed time, return to step S 1 0 3 again.
- the determination at step S 1 1 1 it is preferable that the determination is made when the determination criterion of Q a> Q b is satisfied for a certain time. If it is determined in step S 1 1 1 that the required heat quantity (Q a) is smaller than the normal heat value (Q b) (step S 1 1 1: NO), the fuel cell 1 0 0 is in the high-efficiency power generation mode. A state is reached (step S 1 2 9). In this state, the operating point of the fuel cell can supply the required output. The voltage target value / current target value on the curve is calculated (step S 1 3 1).
- the fuel cell system 10 can be generated with high efficiency while supplying the required amount of heat.
- step S 1 3 5 after the power generation state is changed from the low-efficiency power generation mode to the high-efficiency power generation mode, it is determined whether the residual water amount in the cell is larger than a predetermined value (step S 1 3 5) .
- the amount of residual water in the cell may be estimated from the current value of the fuel cell and the amount of supplied air, or may be estimated from the resistance value of the solid polymer membrane constituting the fuel cell.
- step S 1 3 5 YES
- the water accumulated in the gas flow path in the cell is discharged by increasing the reaction gas flow rate.
- Step S 1 3 7 In the gas flow path on the cathode side of the fuel cell, the air supply is increased by an air pump. As a result, water can be discharged.
- the water accumulated in the gas flow path on the anode side of the fuel cell may be discharged by driving the hydrogen pump in the hydrogen circulation path to increase the gas supply amount.
- the I-V curve of high-efficiency power generation shows the most efficient curve, and the power generation efficiency is saturated with respect to the air supply amount. Therefore, even if the air supply is increased during high-efficiency power generation, the characteristics of the I-V curve do not change. If the voltage value is controlled to be constant by the DC / DC converter, the operating point of the fuel cell will not change. Therefore, the output of the fuel cell is constant, and there is no problem of surplus output being supplied.
- step S 1 3 5: N 2 O the control of this embodiment is finished as it is.
- the system block diagram of 2nd Embodiment is shown.
- the system configuration of the second embodiment is a configuration in which a DCDC converter 5 07 is further provided at the output terminal of the fuel cell 100 in the fuel cell load system 500 in the first embodiment. That is, the load system 5 0 0 of the fuel cell system is configured such that the fuel cell 1 0 0 is connected in series with the DCDC converter 5 0 7, the drive motor driver 5 0 2 and the drive motor driver 5 0 4, In parallel with the drive inverter 5 0 2 and the drive driver 5 0 4, a D CZD C converter 5 0 6, a secondary battery 5 0 8, and auxiliary equipment 5 1 0 are provided.
- the drive mode is increased by boosting the voltage of the fuel cell even when the voltage of the fuel cell is lower than the first voltage lower limit value. 0 4 can be operated. As a result, the voltage of the fuel cell 100 can be lowered to the second voltage lower limit value determined from the control limit of the DC ZD C comparator 507.
- the amount of heat required for heating required by the operating heating device (step S 2 0 1) is calculated using a map (step S 2 0 3).
- the amount of heat necessary for maintaining the temperature of the fuel cell system is calculated using a map (step S 2 0 5).
- the total value of the heat required for heating and the heat required for maintenance becomes the required heat (Q a).
- the required output of the total value of the output request of the drive motor 50 4 and the output request of the auxiliary equipment of the fuel cell system 10 is calculated by the control unit 600 (step S 2 0 7).
- the calorific value (normal calorific value, Qb) of the fuel cell at the operating point that satisfies the required output in the high-efficiency power generation state is calculated (step S 2 0 9). It is determined whether the calculated required heat quantity (Q a) is larger than the normal calorific value (Q b) (step S 2 1 1).
- step S 2 11 YES
- step S 2 11 YES
- step S 2 11 YES
- step S 2 11 YES
- step S 2 1 3 the second low-efficiency power generation in which the lower limit value of the voltage is allowed to the second voltage lower limit value regardless of whether or not the output torque is required for the drive motor.
- the mode is set (step S 2 2 3).
- a voltage target value and a current target value that satisfy the heat generation request and the output request within the allowable voltage range are determined (step S 2 2 5).
- step S 2 2 7 The duty ratio of the DCZDC converter is controlled so that the fuel cell voltage becomes the voltage target value, and the air supply amount is controlled by the air pump so that the current becomes the current target value (step S 2 2 7 ).
- step S 2 31 the control after step S 2 31 is the same as that after step S 1 3 1 of the first embodiment.
- the required amount of heat of the fuel cell system is supplied by the heat generated by the fuel cell.
- a heating unit is attached to the fuel cell system, and the amount of heat obtained by removing the amount of heating by the heating unit from the required amount of heat is calculated. It is also suitable to supply without excess or deficiency.
- water collected in the low-efficiency power generation mode is drained after shifting to the high-efficiency power generation mode.
- the reactive gas flow rate may be forcibly increased when shifting from the low efficiency power generation mode to the high efficiency power generation mode.
- the estimation of the residual amount in the cell may be estimated from the duration of the low-efficiency power generation mode.
- the reaction gas increase amount for drainage may be set to increase as the residual amount in the cell increases.
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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KR1020107004226A KR101152856B1 (ko) | 2007-07-30 | 2008-07-23 | 연료전지시스템 및 그 제어방법 |
EP08791856.1A EP2178148B1 (en) | 2007-07-30 | 2008-07-23 | Fuel cell system and its control method |
US12/670,849 US8859157B2 (en) | 2007-07-30 | 2008-07-23 | Fuel cell system and its control method |
CN200880100131XA CN101755359B (zh) | 2007-07-30 | 2008-07-23 | 燃料电池系统及其控制方法 |
CA2692547A CA2692547C (en) | 2007-07-30 | 2008-07-23 | Fuel cell system with heat generation quantity control and its control method |
US14/480,971 US9577271B2 (en) | 2007-07-30 | 2014-09-09 | Fuel cell system and its control method |
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JP2007197057A JP4458126B2 (ja) | 2007-07-30 | 2007-07-30 | 燃料電池システム及びその制御方法 |
JP2007-197057 | 2007-07-30 |
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US12/670,849 A-371-Of-International US8859157B2 (en) | 2007-07-30 | 2008-07-23 | Fuel cell system and its control method |
US14/480,971 Continuation US9577271B2 (en) | 2007-07-30 | 2014-09-09 | Fuel cell system and its control method |
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EP (1) | EP2178148B1 (ja) |
JP (1) | JP4458126B2 (ja) |
KR (1) | KR101152856B1 (ja) |
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JP2009032605A (ja) | 2009-02-12 |
CN101755359A (zh) | 2010-06-23 |
KR20100035182A (ko) | 2010-04-02 |
CN101755359B (zh) | 2013-03-27 |
CA2692547A1 (en) | 2009-02-05 |
JP4458126B2 (ja) | 2010-04-28 |
US20150064589A1 (en) | 2015-03-05 |
CA2692547C (en) | 2012-03-20 |
EP2178148A4 (en) | 2012-06-27 |
US8859157B2 (en) | 2014-10-14 |
US9577271B2 (en) | 2017-02-21 |
EP2178148B1 (en) | 2013-08-21 |
KR101152856B1 (ko) | 2012-06-12 |
US20100203409A1 (en) | 2010-08-12 |
EP2178148A1 (en) | 2010-04-21 |
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