JP2006164555A - Output limitation apparatus for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output limitation apparatus for a fuel cell from which a maximum output which can be outputted from the fuel cell can be derived and the temperature of the fuel cell does not exceed durable temperature. <P>SOLUTION: A controller 12 which is the output limitation apparatus for the fuel cell is provided with an output limitation value calculating means 14 calculating the output limitation value which is a limitation value for extracted power or extracted current from the fuel cell 2 on the basis of the temperature of a fuel cell entrance coolant temperature sensor 7 detecting the temperature of the fuel cell 2, a deterioration detecting means 13 detecting the degree of deterioration of the fuel cell 2 and an output limitation value compensation means 15 compensating the output limitation value based on the degree of deterioration detected by the deterioration detecting means 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel cell output limiting device.

  Fuel cell vehicles are equipped with hydrogen storage devices such as compressed hydrogen cylinders, liquid hydrogen tanks, hydrogen storage alloys, etc., or reform hydrocarbon-based fuels (such as methanol) and contain hydrogen and oxygen supplied from them. It is a vehicle that sends air to a fuel cell to react and uses the obtained electric power as a driving force, and has attracted attention for its high conversion efficiency to electric energy and cleanliness.

  One of the problems in putting this fuel cell into practical use is the effect of fuel cell performance degradation. A deteriorated fuel cell causes a decrease in output voltage as the deterioration proceeds. In general, direct current power generated in a fuel cell is converted into alternating current power by an orthogonal transformation device and transmitted to a motor that is the power of the vehicle. However, a certain amount of power is secured in a fuel cell that has been deteriorated. Therefore, as the output voltage decreases, more output current flows, and it is necessary to take measures such as increasing the size and capacity of the orthogonal transformation device in advance in anticipation of deterioration of the fuel cell. It was.

  For this reason, in the technique described in Patent Document 1, the output voltage and the allowable voltage are compared, and when the output voltage falls below the allowable voltage, the output limit amount is adjusted to cope with the deterioration.

As a fuel cell deterioration diagnosis technique, a method of diagnosing deterioration of the fuel cell stack from the output voltage / output current ratio of the fuel cell stack is known (for example, Patent Document 2).
Japanese Patent Laid-Open No. 07-142079 (5th page, FIG. 1) JP-A-11-195423 (page 7, FIG. 2)

  However, the decrease in the output voltage caused by the deterioration of the fuel cell means that the conversion efficiency from chemical energy to electrical energy is decreased, which means that the amount of heat generated in the fuel cell is increased. For this reason, there is a problem that the heat balance of the fuel cell system deteriorates and the temperature of the fuel cell rises.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an output limiting device for a fuel cell in which the maximum output that can be output from the fuel cell is taken out and the fuel cell temperature does not exceed the heat resistance temperature.

  In order to solve the above problems, the present invention provides a temperature detecting means for detecting or estimating the temperature of the fuel cell, and a restriction on the power or current extracted from the fuel cell based on the temperature of the fuel cell by the temperature detecting means. An output limit value calculating means for calculating an output limit value that is a value, a deterioration detecting means for detecting the degree of deterioration of the fuel cell, and a deterioration detection means detected by the deterioration detecting means. The gist of the invention is that it further comprises output limit value correction means for correcting the output limit value based on the degree.

  According to the present invention, it is possible to perform correction according to the degree of deterioration of the fuel cell with respect to the output restriction due to the temperature of the fuel cell. There is an effect that the maximum possible output can be taken out.

  Further, there is an effect that it is possible to prevent the temperature of the fuel cell from exceeding the heat resistant temperature when the deterioration progresses.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. Each embodiment described below is a fuel cell output limiting device suitable for a fuel cell vehicle, although not particularly limited thereto.

  FIG. 1 is a schematic configuration diagram showing a schematic configuration of a fuel cell system including a first embodiment of a fuel cell output limiting device according to the present invention.

  In FIG. 1, a fuel cell system 1 controls a fuel cell 2, a compressor 3 that controls the flow rate of air, a throttle 4 that controls the pressure of air, a variable valve 5 that controls the flow rate of high-pressure hydrogen, and a flow rate of cooling water. Cooling water pump 6, fuel cell inlet cooling water temperature sensor (fuel cell inlet cooling water temperature detecting means) 7 for detecting fuel cell inlet cooling water temperature, fuel for detecting fuel cell inlet cooling water pressure A battery inlet cooling water pressure sensor 8, a fuel cell outlet cooling water pressure sensor 9 for detecting the outlet cooling water pressure of the fuel cell, a radiator 10 for cooling the cooling water, and a load device (power manager for taking out current from the fuel cell) 11) A controller 12 that controls the entire fuel cell system and limits the current that the load device 11 extracts from the fuel cell 2 is provided.

  In the compressor 3, air is compressed and sent to the cathode 2 a of the fuel cell 2. The high-pressure hydrogen is sent to the anode 2 b of the fuel cell 2 with the flow rate controlled by the variable valve 5.

  The fuel cell 2 generates electricity by reacting the fed air and hydrogen. The remaining air used for the reaction in the fuel cell 2 is subjected to pressure control by the throttle 4 and then discharged. Cooling water for cooling the fuel cell is pumped by the cooling water pump 6 and sent to the cooling unit 2c of the fuel cell 2 to cool the fuel cell. The cooling water is cooled by the radiator 10.

  The controller 12 incorporates a target power generation current of the fuel cell 2 (not shown), a fuel cell inlet cooling water temperature sensor 7, a fuel cell inlet cooling water pressure sensor 8, and a fuel cell outlet cooling water pressure sensor 9 which are incorporated therein. The entire fuel cell system 1 is controlled by controlling the compressor 3, the throttle 4, the variable valve 5, and the cooling water pump 6 based on the control software.

  In addition, the controller 12 calculates an output limit value that is a limit value of the extraction power or extraction current from the fuel cell 2 based on the temperature by the fuel cell inlet cooling water temperature sensor 7 that detects the temperature of the fuel cell 2. A value calculating means 14; a deterioration detecting means 13 for detecting the degree of deterioration of the fuel cell 2; and an output limit value correcting means 15 for correcting the output limit value based on the degree of deterioration detected by the deterioration detecting means 13. Also serves as a fuel cell output limiting device.

  Although the controller 12 is not particularly limited, in this embodiment, the controller 12 is composed of a CPU, a program ROM, a working RAM, and a microprocessor having an input / output interface. This is realized by a control program and various control data stored in.

  FIG. 2 is a block diagram illustrating a block configuration inside the controller 12. In FIG. 2, the controller 12 includes a deterioration detection unit 13, a cooling water flow rate detection unit 203, an output restriction unit 204, a target gas flow rate calculation unit 210, a subtraction unit 211, and a target cooling water flow rate correction calculation unit 212. , And adding means 213.

  The cooling water flow rate detecting means 203 detects the flow rate of the cooling water flowing through the cooling unit 2 c of the fuel cell 2 based on the detection values of the fuel cell inlet cooling water pressure sensor 8 and the fuel cell outlet cooling water pressure sensor 9.

  The output limiting unit 204 includes an output limit value correction amount calculation unit 205 based on deterioration, an output limit value calculation unit 206 based on the fuel cell inlet coolant temperature, an output limit value correction amount calculation unit 207 based on the coolant flow rate, and an addition unit 208. And a final output limit value calculation unit 209.

  The output limit value correction amount calculation unit 205 due to deterioration calculates an output limit value correction amount due to deterioration of the fuel cell 2 based on the output of the deterioration detection means 13 that detects the degree of deterioration of the fuel cell 2.

  The output limit value calculation unit 206 based on the fuel cell inlet cooling water temperature is based on the detected value of the fuel cell inlet cooling water temperature detection means (the fuel cell inlet cooling water temperature detection sensor in FIG. 1) 7 based on the fuel cell inlet cooling water temperature. Calculate the output limit value. An output limit value correction amount calculation unit 207 based on the cooling water flow rate calculates an output limit value correction amount based on the cooling water flow rate based on the cooling water flow rate detected by the cooling water flow rate detection unit 203.

  The final output limit value calculation unit 209 includes outputs of an output limit value correction amount calculation unit 205 based on deterioration, an output limit value calculation unit 206 based on the fuel cell inlet coolant temperature, and an output limit value correction amount calculation unit 207 based on the coolant flow rate. Are added together by the adding means 208 and the corrected output limit value is input.

  According to the present embodiment, since all output limit value correction amounts of correction components due to deterioration of the fuel cell are calculated and added, all components are unified into output limit values, and the magnitude relationship of output limits by each component is clear. become.

  In the final output limit value calculation unit 209, when the temperature detected by the fuel cell inlet cooling water temperature detecting means 7 is equal to or lower than a predetermined value, or when the input output limit value is larger than the target generated current, the target generated current is set. The target output current is output to the load device 11, and if not, the output limit value is output to the load device 11 as the target output current.

  Further, the target gas flow rate calculation unit 210 calculates a target hydrogen flow rate and a target air flow rate based on the target extraction current value after the output restriction. As described above, the target gas flow rate is calculated in accordance with the power or current whose output is limited, so that the gas flow rate corresponding to the extracted power or the extracted current can be supplied to the fuel cell, and the water due to the excessive gas supply can be supplied. It is possible to prevent the deterioration of the balance and the shortage of gas supply.

  The target cooling water flow rate correction calculation unit 212 calculates a target cooling water flow rate correction value based on the deviation between the target generated current and the output limit value, and here the target cooling water flow rate calculated by a target cooling water flow rate calculation unit (not shown). The target cooling water flow rate correction value is added to and the target cooling water correction flow rate is output.

  According to the present embodiment, since the cooling water flow rate can be increased while the output restriction is performed, the output restriction can be relaxed by lowering the temperature of the fuel cell. In addition, when the output is not limited, the waste water energy is not used by reducing the cooling water flow rate.

  FIG. 3 shows a main flowchart of control performed in the controller 12. This process is performed once every 10 [msec], for example.

  First, in step (hereinafter, step is abbreviated as S) 301, a deterioration rate k indicating the degree of deterioration of the fuel cell is obtained. In the present invention, the deterioration rate k is set to 1 (100%) as the reference performance value (for example, the generated voltage at the reference generated current) when the fuel cell 2 is not deteriorated at all. The ratio of the current performance value is represented by the deterioration rate k. The deterioration rate k is obtained from the total operating time of the fuel cell separately measured by the controller 12 with reference to a calculation formula or a control map stored in the controller 12 in advance. As for this calculation formula or control map, it is assumed that an approximate calculation formula is obtained from the deterioration characteristics of the fuel cell determined in advance from experiments or desk studies, a control map is created, and stored in the ROM of the controller 12.

  Next, the fuel cell inlet cooling water temperature Tin is read from the fuel cell inlet cooling water temperature sensor 7 in S302. Thus, by using the fuel cell inlet coolant temperature as the temperature of the fuel cell, the temperature of the fuel cell can be accurately estimated without providing a temperature sensor inside the fuel cell.

  In S303, the fuel cell inlet cooling water pressure Pin is read from the fuel cell inlet cooling water pressure sensor 8 and the fuel cell outlet cooling water pressure Pout is read from the fuel cell outlet cooling water pressure sensor 9, and the differential pressure value (pressure loss) subtracted from Pin by Pout. From this, the coolant flow rate Q is calculated with reference to a control map as shown in FIG. The control map of FIG. 4 is obtained by storing in the ROM of the controller 12 the characteristics of the cooling water flow rate with respect to the fuel cell pressure loss of the cooling water determined in advance from experiments and desk studies.

  Next, in S304, the current limit value Cl is obtained using the deterioration rate k, the fuel cell inlet coolant temperature Tin, and the coolant flow rate Q. A detailed calculation method will be described later.

  In S305, if the fuel cell inlet coolant temperature Tin is equal to or lower than the predetermined value Tth, the target generated current is substituted for the final target extraction current Cle instructed to the load device 11. If the fuel cell inlet coolant temperature Tin is greater than the predetermined value Tth, the target power generation current and the current limit value Cl are compared, and the smaller value is selected as the final target extraction current Cle. Here, if the value of the current limit value Cl is smaller than the target generated current, the output is limited. If it is larger, the target extraction current Cle = the target generated current, and the output is not limited. For the predetermined value Tth, a cooling water temperature that does not need to be current-limited is determined in advance from experiments and desk studies.

  In S306, the target hydrogen flow rate and the target air flow rate are calculated using the target extraction current Cle from the characteristics of the target hydrogen flow rate and the target air flow rate with respect to the target extraction current determined in advance through experiments and desk studies.

  With reference to the characteristic map of the current limit amount and the target coolant flow rate correction amount stored in advance in the controller 12 as shown in FIG. 5 in S307, the target coolant flow rate correction amount is calculated as the target generated current and the current limit value Cl. Calculation is performed using the difference, and the calculation result is added to the target coolant flow rate and corrected.

  The characteristic of FIG. 5 is that the larger the target generated current is larger than the current limit value, the larger the coolant flow rate correction amount is made to make it harder to exceed the allowable pressure resistance temperature of the fuel cell. The smaller the smaller, the smaller the cooling water correction flow rate within the range that does not exceed the allowable temperature limit of the fuel cell.

  FIG. 6 is a flowchart showing a method of calculating the current limit value Cl in S304. First, referring to the characteristic map of the current limit value correction amount with respect to the deterioration rate determined in advance from experiments and desk studies as shown in FIG. 7 in S601, the current limit value correction amount Cld due to deterioration is determined using the deterioration rate k. Calculate.

  Next, referring to the characteristic map of the current limit value depending on the fuel cell inlet cooling water temperature with respect to the fuel cell inlet cooling water temperature determined in advance from experiments and desk studies as shown in FIG. Is calculated using the fuel cell inlet coolant temperature Tin.

  Next, referring to the characteristic map of the current limit value correction amount based on the cooling water flow rate with respect to the cooling water flow rate determined in advance from experiments and desk studies as shown in FIG. 9 in S603, the current limit value correction amount Clq based on the cooling water flow rate is determined. Is calculated using the cooling water flow rate Q.

  Each of the characteristic maps in FIGS. 7 to 9 referred to in S601 to S603 is stored in the ROM of the controller 12 in advance.

  In S604, the current limit value Cl is calculated using the following equation (1).

Cl = Cld + Clc + Clq (1)
In this embodiment, the output of the fuel cell is limited by the extraction current, but the output may be limited by the extraction power. In this case, by referring to the current-voltage characteristics of the fuel cell stored in the controller 12 and calculating the target generated current from the target generated power, the output limitation by the extracted power can be replaced with the limitation by the extracted current.

  In this embodiment, the deterioration of the fuel cell is calculated from the total operating time of the fuel cell. However, the deterioration of the fuel cell is calculated by calculating the relationship between the total travel distance of the vehicle and the output voltage with respect to the fuel cell extraction current. Any other method for detecting the signal may be used.

  In this embodiment, the current limit value is corrected by using the deterioration rate. However, the deterioration rate k is determined based on the deterioration rate determined in advance from experiments and desk studies as shown in FIG. May be used to calculate the increased heat generation amount, and the current limit value may be corrected using the increased heat generation amount. The amount of heat generated by the fuel cell increases as the deterioration proceeds even at the same output current. If the heat generation amount that increases from the deterioration rate of the fuel cell is calculated and the current limit value is corrected with this increased heat generation amount, an output limit value with higher accuracy can be calculated.

  In this embodiment, if the fuel cell inlet coolant temperature Tin is equal to or lower than the predetermined value Tth in S305, the target power generation current is substituted for the final target extraction current Cle so that the output is not limited. However, a similar function can be realized by setting the current limit value Clc depending on the fuel cell inlet coolant temperature to a characteristic that gives a larger value as the fuel cell inlet coolant temperature Tin is smaller.

  In this embodiment, the actual coolant flow rate is calculated from the difference between the outputs of the fuel cell inlet pressure sensor 8 and the fuel cell outlet pressure sensor 9, but it may be calculated using only one of the pressure sensors. Further, if the cooling water pump 6 includes a consumption current sensor or an actual rotation speed sensor, the coolant flow rate may be calculated using the output thereof.

  The above items are the same in the following embodiments.

  Next, a second embodiment of the output limiting device for a fuel cell according to the present invention will be described. The schematic configuration diagram of the whole fuel cell system to which the second embodiment is applied is the same as that of the first embodiment shown in FIG.

  FIG. 11 is a block diagram illustrating the internal configuration of the controller 12 of the second embodiment. Compared to FIG. 2 of the first embodiment, the output limit value correction amount calculation unit 205 due to deterioration is deleted, and The output limit value correction amount calculation unit 207 is replaced with a cooling water flow rate reduction rate calculation unit 1101. Further, the adding means 208 in FIG. Other configurations are the same as those in FIG.

  The cooling water flow rate reduction rate calculation unit 1101 calculates the cooling water flow rate reduction rate based on the cooling water flow rate detection means 203. The final output limit value calculation unit 209 has an output limit value obtained by multiplying all of the deterioration rate, the cooling water flow rate reduction rate, and the output of the output limit value calculation unit 206 based on the fuel cell inlet cooling water temperature by the multiplication unit 1102. Entered.

  Although the main flowchart of the second embodiment is the same as that of FIG. 3 of the first embodiment, the calculation method of the current limit value Cl in S304 is changed, and FIG. 12 shows a flowchart of calculation contents.

  First, in S1201, referring to the characteristic map of the current limit value depending on the fuel cell inlet cooling water temperature with respect to the fuel cell inlet cooling water temperature determined in advance from experiments and desk studies as shown in FIG. The current limit value Clc is calculated using the fuel cell inlet coolant temperature Tin.

  Next, the cooling water flow rate reduction rate Qk from the design value of the cooling water flow rate determined in advance through experiments and desk studies in S1202 is calculated using the cooling water flow rate Q.

  In step S1203, the current limit value Cl is calculated using the following equation (2).

Cl = Clc × k × Qk (2)
When the flow rate of cooling water decreases due to deterioration of the cooling system such as a cooling water filter, that is, the temperature difference between the inlet and outlet of the fuel cell opens, and the temperature of the fuel cell tends to increase. In this embodiment, since the cooling water flow rate is used for the correction calculation of the output limit value, when the cooling water flow rate decreases, it is possible to apply an output limitation that suppresses the heat generation amount of the fuel cell.

  Next, a third embodiment of the output limiting device for a fuel cell according to the present invention will be described. The schematic configuration diagram of the whole fuel cell system to which the third embodiment is applied is the same as that of the first embodiment shown in FIG.

  FIG. 13 is a block diagram illustrating the internal configuration of the controller 12 of the third embodiment. Compared to FIG. 2 of the first embodiment, the cooling water flow rate detection means 203, the output limit value correction amount calculation unit 205 due to deterioration, The output limit value correction amount calculation unit 207 based on the coolant flow rate is deleted, and the output limit value calculation unit 206 based on the fuel cell inlet coolant temperature is replaced with an output limit value calculation unit 1303. Other configurations are the same as those in FIG.

  Based on the deterioration rate of the fuel cell 2 detected by the deterioration detection unit 13 and the temperature of the fuel cell 2 detected by the fuel cell inlet cooling water temperature detection unit 7, the output limit value calculation unit 1303 is a current as an output limit value. The limit value is calculated, and the calculation result is output to the final output limit value calculation unit 209.

  The main flowchart of Example 3 is shown in FIG. Compared to FIG. 3 of the first embodiment, S303 is deleted and S304 is replaced with S1504.

  In S1504, referring to the characteristic map of the current limit value with respect to the deterioration rate and the fuel cell inlet cooling water temperature determined in advance through experiments and desk studies as shown in FIG. 15, the current limit value Cl is set to the deterioration rate k and the fuel cell. Calculation is performed using the inlet cooling water temperature Tin.

  In this example, the correction was made based only on the deterioration rate, but a current limit value characteristic map for the coolant flow rate and the fuel cell inlet coolant temperature was prepared in advance through experiments and desktop studies, and the current limit value based on the coolant flow rate was calculated. The fuel cell inlet cooling water temperature Tin and the cooling water flow rate Q may be used for calculation, and the smaller of the calculation result and the current limit value Cl may be selected (select low).

  Next, a fourth embodiment of the output limiting device for a fuel cell according to the present invention will be described. The schematic configuration diagram of the entire fuel cell system to which the fourth embodiment is applied is the same as that of the first embodiment shown in FIG.

  FIG. 16 is a block diagram illustrating the internal configuration of the controller 12 of the fourth embodiment. Compared with FIG. 13 of the third embodiment, the temperature detected by the fuel cell inlet cooling water temperature detecting means 7 is the deterioration detecting means 13. Dividing means 1601 for dividing by the detected deterioration rate is added, and the output limit value calculating unit 1303 is replaced with the output limit value calculating unit 1603. Other configurations are the same as those in FIG.

  The output limit value calculation unit 1603 calculates the output limit value based on the temperature value obtained by correcting the temperature detected by the fuel cell inlet cooling water temperature detection means 7 with the output of the deterioration detection means 13, and the calculation result is the final output limit. The data is output to the value calculation unit 209.

  FIG. 17 shows a main flowchart of the fourth embodiment. Compared to FIG. 14 of the third embodiment, S1703 is added and S1504 is replaced with S1704.

  In S1703, the fuel cell inlet cooling water temperature Tin is corrected by the deterioration rate k using the following equation (3) to calculate the fuel cell inlet cooling water correction temperature Tina.

Tina = Tin / k (3)
In S1704, the current limit value Cl is calculated using the fuel cell inlet cooling water correction temperature Tina from the characteristics of the fuel cell inlet cooling water correction temperature and the current limit value determined in advance through experiments and desk studies as shown in FIG.

  According to the present embodiment, since the temperature of the fuel cell is corrected by the correction component due to deterioration, it is possible to grasp the accurate fuel cell temperature in consideration of the calorific value increased due to the influence of deterioration.

  In this embodiment, the correction is performed only by the deterioration rate k, but the cooling water flow rate reduction rate Qk shown in the second embodiment may be further used for correction.

1 is a schematic configuration diagram of a fuel cell system to which an output limiting device for a fuel cell according to the present invention is applied. FIG. 2 is a block configuration diagram illustrating an internal configuration of a controller according to the first embodiment. 3 is a main flowchart of the first embodiment. It is an example of the map which shows a cooling system fuel cell pressure loss-cooling water flow rate characteristic. It is an example of the map which shows an electric current limitation amount-target cooling water flow volume correction amount characteristic. 3 is a flowchart of output limit value calculation in the first embodiment. It is an example of the map which shows the electric current limit value correction amount characteristic by deterioration rate-deterioration. It is an example of the map which shows the electric current limit value characteristic by a fuel cell entrance cooling water temperature-fuel cell entrance cooling water temperature. It is an example of the map which shows the output limitation value correction amount characteristic by cooling water flow-cooling water flow. It is an example of the map which shows the increase calorific value characteristic by deterioration rate-deterioration. FIG. 6 is a block configuration diagram illustrating an internal configuration of a controller in Embodiment 2. 10 is a flowchart of output limit value calculation in the second embodiment. FIG. 10 is a block configuration diagram illustrating an internal configuration of a controller according to a third embodiment. 10 is a main flowchart of the third embodiment. It is an example of the map which shows the output limiting value characteristic with respect to a deterioration rate and a fuel cell inlet_port | entrance coolant temperature. FIG. 10 is a block configuration diagram illustrating an internal configuration of a controller in Embodiment 4. 10 is a main flowchart of the fourth embodiment. It is an example of the map which shows a fuel cell entrance cooling water correction temperature-output limitation value characteristic.

Explanation of symbols

1: Fuel cell system 2: Fuel cell 3: Compressor 4: Throttle 5: Variable valve 6: Cooling water pump 7: Fuel cell inlet cooling water temperature sensor 8: Fuel cell inlet cooling water pressure sensor 9: Fuel cell outlet cooling water pressure Sensor 10: Radiator 11: Load device 12: Controller 13: Degradation detecting means 14: Output limit value calculating means 15: Output limit value correcting means

Claims (11)

Temperature detecting means for detecting or estimating the temperature of the fuel cell;
Output limit value calculating means for calculating an output limit value that is a limit value of the electric power or current taken out from the fuel cell based on the temperature of the fuel cell by the temperature detecting means;
In a fuel cell output limiting device comprising:
Deterioration detecting means for detecting the degree of deterioration of the fuel cell;
An output limit device for a fuel cell, further comprising output limit value correction means for correcting the output limit value based on a degree of deterioration detected by the deterioration detection means. Based on the degree of deterioration detected by the deterioration detection means, further includes an increased heat generation amount calculation unit that calculates an increased heat generation amount of the fuel cell due to deterioration
The output limit value correcting means includes
2. The fuel cell output limiting device according to claim 1, wherein the output limiting value is corrected based on the increased heat generation amount. A cooling water flow rate detecting means for detecting a cooling water flow rate of the fuel cell;
The output limit value correcting means includes
3. The output limiting device for a fuel cell according to claim 1, wherein the output limiting value is corrected based on the cooling water amount detected by the cooling water flow rate detecting means. The output limit value correcting means includes
The output limit value based on the temperature detected by the temperature detecting means is corrected according to the degree of deterioration detected by the deterioration detecting means, and the correction result is used as a limit value for the extracted power or the extracted current from the fuel cell. 4. The fuel cell output limiting device according to claim 1, wherein the output limiting device is a fuel cell. The output limit value correcting means includes
The output limit value based on the temperature by the temperature detection means and the correction value based on the degree of deterioration detected by the deterioration detection means are added, and the addition result is used as a limit value for the extraction power or extraction current from the fuel cell. The output limiting device for a fuel cell according to any one of claims 1 to 3, characterized in that: The output limit value correcting means includes
The temperature detected by the temperature detecting means is corrected according to the degree of deterioration detected by the deterioration detecting means, and the limit value of the extracted power or the extracted current from the fuel cell is calculated using the corrected temperature value. The output limiting device for a fuel cell according to any one of claims 1 to 3. The output limit value correcting means includes
7. The fuel cell output limiting device according to claim 1, wherein when the temperature detected by the temperature detection unit is equal to or lower than a predetermined value, the output limitation of the fuel cell is not performed. 7. The temperature detecting means includes
8. The fuel cell output limiting device according to claim 1, wherein the fuel cell cooling water is a fuel cell inlet temperature detecting means for detecting a temperature of the fuel cell cooling water at the fuel cell inlet.   9. The target flow rate of at least one of the fuel gas and the oxidizing gas supplied to the fuel cell is calculated according to the output of the output limit value calculating means. 9. Fuel cell output limiting device.   A target cooling water flow rate correcting unit for correcting a target cooling water flow rate of the fuel cell cooling water when the extracted power or the extraction current is limited by the output limit value calculating unit is provided. The output limiting device for a fuel cell according to any one of claims 1 to 9. The target cooling water flow rate correcting means is
11. The fuel cell output limiting device according to claim 10, wherein the correction is increased as the limit of the extracted power or the extracted current by the output limit value calculating means increases.

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