JP5444789B2 - Fuel cell deterioration judgment device - Google Patents

Description

  The present invention relates to a fuel cell deterioration determination device, and more particularly to a fuel cell deterioration determination device that determines deterioration of a fuel cell by distinguishing a temporary output decrease.

  Since there is little impact on the environment, fuel cells are installed in vehicles. A fuel cell, for example, supplies a fuel gas such as hydrogen to the anode side of unit cells constituting a fuel cell stack, supplies an oxidizing gas containing oxygen, such as air, to the cathode side, and requires electric power required for reaction through an electrolyte membrane. Take out.

  A unit cell constituting a fuel cell stack includes a membrane electrode assembly (Membrane Electrode) having an electrolyte membrane, a catalyst layer disposed on each side of the electrolyte membrane, and an anode side electrode and a cathode side electrode disposed on the outside of each catalyst layer. Assembly (MEA) and a set of separators that sandwich the MEA.

  In MEA, the power generation capacity decreases as the electrochemical reaction progresses. For example, the maximum output of the fuel cell decreases as the fuel cell operates. This decrease in output includes the degradation of MEA, and therefore it is necessary to determine the degree of degradation. Here, the output means output power.

  In Patent Document 1, an evaluation mode for measuring an output voltage under a constant condition of a current to be drawn out is set as a fuel cell power generation device or the like. In this evaluation mode, a past output voltage is compared with a current output voltage. It is disclosed to diagnose a deterioration state of a fuel cell power generator.

  In Patent Document 2, deterioration in the fuel cell system includes catalytic activity deterioration that increases activation polarization, resistance polarization that increases resistance, and gas diffusion layer diffusion performance deterioration that increases diffusion polarization. It is stated that these are separated based on voltage, current and resistance measurements and a pre-determined database. And since the water repellency performance deteriorates and flooding occurs when the gas diffusion layer diffusion performance deteriorates, it is disclosed that the pressure is released to increase the porosity and increase the diffusion performance.

  Patent Document 3 describes several methods for estimating deterioration from current-voltage characteristics as a fuel cell power generator and the like. For example, the degradation is estimated from the change in the voltage where the slope of the current decreases with the current-voltage characteristic, or the current and the slope of the current-voltage characteristic and the intercept current are calculated by linear approximation from the change in the voltage at that time. Determine the deterioration from the change.

  In Patent Document 4, as a physical parameter estimation method of a fuel cell, the output voltage is measured by scanning the output current in the current-voltage characteristic, the catalyst activation voltage loss is in the small current region, the resistance voltage loss is large in the medium current region. It is described that the physical parameters of the catalyst layer, the electrolyte membrane, and the diffusion layer are estimated by fitting each model equation with the current region as the concentration voltage loss.

  As particularly relevant to the present invention, in Patent Document 5, in the fuel cell system, the oxidation deterioration of the catalyst is a recoverable deterioration, and the carbon corrosion deterioration is an unrecoverable deterioration. It is disclosed that an irreparable deterioration is obtained by subtracting the amount recovered from a shutdown from a decrease value from the initial voltage value of the voltage characteristic to the current voltage value. Here, it is stated that the longer the operation duration, the higher the voltage, the greater the recoverable voltage drop.

JP 2007-87686 A JP 2005-322577 A JP-A-11-195423 JP 2009-26567 A JP 2006-147404 A

  As shown in the prior art, in a fuel cell using an electrolyte membrane, the output decrease accompanying the progress of the operation of the fuel cell includes a recoverable temporary output decrease and an output decrease due to unrecoverable deterioration. It is.

  As the operation of the fuel cell continues, the catalyst gradually oxidizes, and the output capacity of the fuel cell decreases.For example, the maximum output decreases temporarily, but this oxidation is a reversible reaction. In the next operation, the maximum output of the fuel cell is restored. Thus, the decrease in the maximum output due to the catalytic oxidation is a temporary output decrease. However, as the aging of MEA progresses, the catalyst rapidly oxidizes immediately after operation, so that the temporary decrease in the maximum output of the fuel cell also increases.

  In contrast, degradation of fuel cell electrolyte membranes and loss of fuel cell output capacity due to loss of carbon support in the diffusion electrode layer are irreversible changes that cannot be restored. It can be said that abnormal deterioration is caused by the rapid progress of this deterioration due to a slight decrease in output.

  Therefore, it is necessary to determine the progress of the abnormal deterioration so as not to include the temporary output decrease in the fuel cell deterioration determination.

  Assuming that each trip from the start to the stop of the fuel cell is each trip, the catalyst of the fuel cell rapidly oxidizes immediately after the start of each trip as described above, and the temporary output The range of decline also tends to increase. As described above, the temporary output reduction due to the oxidation of the catalyst depends on the progress of the aging of the fuel cell. Since the conventional technology does not consider this point, the accuracy of the fuel cell deterioration determination is insufficient.

  An object of the present invention is to provide a fuel cell deterioration determination device that can more accurately reflect the influence of a temporary output decrease.

The fuel cell deterioration determination device according to the present invention provides a deterioration threshold characteristic line in which a reference condition output, which is an output of a fuel cell under a predetermined reference output condition, decreases as the cumulative operation amount increases from the start of the initial operation. Degradation threshold characteristic storage means to obtain and store, and each output from the start and stop of the fuel cell as each trip, temporary output that recovers by stopping the operation with respect to the actual reference condition output of each trip A means for obtaining a corrected reference condition output after returning the decrease as a correction value, and a determination means for determining the deterioration of the fuel cell based on a comparison between the deterioration threshold characteristic line and the corrected reference condition output. means for determining the condition output, the correction value storing means for previously calculated and stored the relationship between the correction value and the accumulated operation amount and trip characteristic value that indicates the progress of the oxidation of the catalyst of the fuel cell in each trip, complement Means for obtaining a correction value determined by the trip characteristic value and the cumulative operation amount based on the relationship stored in the value storage means, and obtaining a corrected reference condition output based on the obtained correction value. And

In addition, the fuel cell deterioration determination device according to the present invention has a deterioration threshold characteristic line in which the reference condition output, which is the output of the fuel cell under a predetermined reference output condition, decreases as the cumulative operation amount increases from the start of the initial operation. The degradation threshold characteristic storage means for obtaining and storing the value in advance and each operation until the fuel cell starts and stops as each trip, and temporarily recovers by stopping the operation with respect to the actual reference condition output of each trip. And a means for obtaining a corrected reference condition output after returning a reduction in output as a correction value, and a determination means for determining deterioration of the fuel cell from a comparison between the deterioration threshold characteristic line and the corrected reference condition output. means for obtaining a post-reference conditions output uses the trip operation time as trip characteristic value that indicates the power status of each trip, a temporary output decreases as the trip operation time increases increases And engaging, the correction value storing means for previously calculated and stored the relationship for the correction value on the basis of the temporary output reduction increases relationships in both the trip increased accumulated operation amount from the initial start-correction value storing means based on the relationship stored comprises means for obtaining a correction value determined by the trip characteristic value and the accumulated operation amount, and obtains the corrected reference condition output based on the obtained correction value.

In addition, the fuel cell deterioration determination device according to the present invention has a deterioration threshold characteristic line in which the reference condition output, which is the output of the fuel cell under a predetermined reference output condition, decreases as the cumulative operation amount increases from the start of the initial operation. The degradation threshold characteristic storage means for obtaining and storing the value in advance and each operation until the fuel cell starts and stops as each trip, and temporarily recovers by stopping the operation with respect to the actual reference condition output of each trip. And a means for obtaining a corrected reference condition output after returning a reduction in output as a correction value, and a determination means for determining deterioration of the fuel cell from a comparison between the deterioration threshold characteristic line and the corrected reference condition output. means for obtaining a post-reference conditions output as trip characteristic value that indicates the power status of each trip, distribution der obtained by asking the output voltage of each separated time each trip unit time Using the time distribution of output voltage, based on the relationship that the higher the output voltage, the larger the temporary output decrease, and the relationship that the temporary output decrease on the trip increases with the increase of the cumulative operation amount from the start of the initial operation. Correction value storage means for obtaining and storing a relationship related to the correction value in advance , and means for acquiring a correction value determined by the trip characteristic value and the cumulative operation amount based on the relationship stored in the correction value storage means. A corrected reference condition output is obtained based on the corrected value .

  In the fuel cell deterioration determination device according to the present invention, the deterioration threshold characteristic storage means uses the accumulated power generation amount or the accumulated power generation time from the start of the initial operation as the accumulated operation amount, and the accumulated power generation charge amount or the accumulated power generation time. It is preferable to store a deterioration threshold characteristic line obtained based on a relationship in which the reference condition output of the fuel cell decreases as the value increases.

  In the fuel cell deterioration determination device according to the present invention, when the fuel cell is used for vehicle travel, the deterioration threshold characteristic storage means is the cumulative travel distance or cumulative travel time from the start of the initial operation as the cumulative operation amount. It is preferable to store a deterioration threshold characteristic line obtained based on a relationship in which the reference condition output of the fuel cell decreases as the cumulative travel distance or cumulative travel time increases.

  In the fuel cell deterioration determination device according to the present invention, the correction value storage means uses the trip travel distance or travel time as the trip characteristic value when the fuel cell is used for vehicle travel, and uses the trip travel distance or travel time. The relationship regarding the correction value is obtained in advance and stored based on the relationship that the temporary output decrease increases as the time increases and the relationship that the temporary output decrease during the trip increases as the cumulative travel distance or cumulative travel time increases. Is preferred.

With the above configuration, the fuel cell deterioration determination device obtains in advance a deterioration threshold characteristic line in which the reference condition output of the fuel cell decreases as the cumulative operation amount increases from the start of the initial operation, and the fuel cell starts operation and stops. Determining the characteristic value of the deterioration after obtaining the corrected reference condition output after returning as a correction value the temporary output decrease recovered by operation stop with respect to the reference condition output of each trip as each trip. The deterioration of the fuel cell is determined from a comparison between the characteristic line and the corrected reference condition output. Here, the relationship between the trip characteristic value indicating the progress of the oxidation of the fuel cell catalyst in each trip, the cumulative operation amount, and the correction value is obtained in advance, and the trip characteristic value and the cumulative operation amount are applied to this relationship. A post-correction reference condition output is obtained based on the obtained correction value, and deterioration determination is performed using this. As a result, both the trip characteristic value and the cumulative operation amount are reflected as the influence of the temporary output decrease, so that the deterioration determination of the fuel cell can be performed more accurately.

  Also, when using trip operation time as the trip characteristic value in the fuel cell deterioration determination device, the longer the trip operation time, the greater the temporary output decrease and the increase in the cumulative operation amount from the start of the initial operation. In both cases, a relationship related to the correction value is obtained in advance based on the relationship in which the temporary output decrease during the trip increases. Then, deterioration determination is performed using this correction value. Thereby, both the trip operation time and the accumulated operation amount are reflected as the influence of the temporary output decrease, so that the deterioration determination of the fuel cell can be performed more accurately.

  Further, in the fuel cell deterioration determination device, as the trip characteristic value, the time distribution of the output voltage, which is a distribution obtained by dividing the elapsed time of each trip into unit times and obtaining each output voltage, The relationship regarding the correction value is obtained in advance on the basis of the relationship in which the temporary output decrease becomes large and the relationship in which the temporary output decrease in the trip increases as the cumulative operation amount increases from the start of the initial operation. Then, deterioration determination is performed using this correction value. As a result, both the voltage dependency of the output and the cumulative operation amount are reflected as the influence of the temporary output decrease, so that the deterioration determination of the fuel cell can be performed more accurately.

  Also, in the fuel cell deterioration determination device, the cumulative power generation amount or cumulative power generation time from the start of the initial operation is used as the cumulative operation amount, and the fuel cell reference condition output decreases as the cumulative power generation charge amount or cumulative power generation time increases. A deterioration threshold characteristic line obtained based on the relationship is used. For example, for a vehicle running on a fuel cell, it may be easy to understand the deterioration determination based on the vehicle travel distance, etc., but there are times when the amount of power generation is large and when the amount of power generation is small depending on the acceleration and deceleration of the vehicle. Yes, when these operations are repeated, it is possible to more accurately reflect the influence on the deterioration of the fuel cell by using the cumulative operation amount related to the power generation amount than the vehicle travel distance or the like. In this way, by adopting the above configuration, it is possible to more accurately determine the deterioration of the fuel cell.

  In the fuel cell deterioration determination device, when the fuel cell is used for vehicle travel, the cumulative travel distance or cumulative travel time from the start of the initial operation is used as the cumulative operation amount, and the cumulative travel distance or cumulative travel time is used. A deterioration threshold characteristic line obtained based on a relationship in which the reference condition output of the fuel cell decreases with an increase in the value is used. As described above, with respect to a vehicle that runs on a fuel cell, the use condition of the vehicle can be reflected in an easy-to-understand manner by determining deterioration based on the cumulative vehicle travel distance or the like.

  Further, in the fuel cell deterioration determination device, when the fuel cell is used for vehicle travel, the trip travel distance or travel time is used as the trip characteristic value, and the temporary output decrease decreases as the trip travel distance or travel time becomes longer. A relationship related to the correction value is obtained in advance based on the relationship that increases and the relationship that the temporary decrease in output during the trip increases as the cumulative travel distance or cumulative travel time increases. As described above, for a vehicle running on a fuel cell, the use status of the vehicle can be reflected in an easily understandable manner by determining the deterioration based on the trip travel distance or the like.

It is a figure which shows the structure of the fuel cell system containing the fuel cell deterioration determination apparatus of embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a figure explaining the mode of the output fall of the fuel cell before considering temporary output fall. In embodiment which concerns on this invention, it is a figure which shows the example of a correction value relationship map. In embodiment which concerns on this invention, it is a figure explaining a mode that the deterioration of a fuel cell is determined by correct | amending temporary output fall using a correction value relationship map. In embodiment which concerns on this invention, it is a figure which shows the other example of a correction value relationship map. In embodiment which concerns on this invention, it is a figure explaining the mode of the example from which the output fall of a fuel cell differs with the difference in the driving state of a vehicle. In embodiment which concerns on this invention, when a vehicle drive | works at a fixed speed, it is a figure explaining the time change of the electric power generation electric charge amount. In embodiment which concerns on this invention, when a vehicle repeats low speed driving | running | working and high speed driving | running | working, it is a figure explaining the mode of the time change of the electric power generation charge amount. In embodiment which concerns on this invention, it is a figure which shows the correction value relation map regarding electric power generation time. In embodiment which concerns on this invention, it is a figure which shows the correction value relationship map regarding the electric power generation electric charge amount. In embodiment which concerns on this invention, it is a figure explaining the mode of the output fall of the fuel cell before considering the voltage-dependent temporary output fall. It is a figure explaining the mode of the time distribution of the voltage in the trip of A of FIG. It is a figure explaining the mode of the time distribution of the voltage in the trip of C of FIG. In an embodiment concerning the present invention, it is a figure showing a correction value relation map about voltage dependence. It is a figure explaining a mode that the influence with respect to temporary output fall is calculated using the correction value relationship map regarding voltage dependence in the trip of A of FIG. It is a figure explaining a mode that the influence with respect to temporary output fall is calculated using the correction value relationship map regarding voltage dependence in the trip of C of FIG. In embodiment which concerns on this invention, it is a figure explaining a mode that the deterioration of a fuel cell is determined by correct | amending the voltage-dependent temporary output fall.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a fuel cell mounted on a vehicle will be described, but a fuel cell used other than a vehicle may be used. For example, a stationary fuel cell may be used. Hereinafter, the fuel cell stack will be described as a combination of two sets of about 200 unit cells arranged in series, but a fuel cell with other combinations may be used.

  In the following, the maximum output of the fuel cell is used for the deterioration determination. This is because the maximum output is a simple indicator of the capacity of the fuel cell and the deterioration is most advanced at the maximum load of the fuel cell. The deterioration determination may be performed under For example, the deterioration determination may be performed using a reference condition output that is an output of the fuel cell under a predetermined reference output condition. As the reference condition output, a standard load factor output under a preset load factor condition or the like can be used for a rated output under a preset rated output condition and a maximum output. In that sense, the maximum output can be considered as a reference condition output with a load factor of 100%.

  Further, the deterioration threshold characteristic line and the correction value relationship map described below are illustrative examples, and take different values depending on the specific contents of the fuel cell system. Further, appropriate changes can be made according to the specifications of the fuel cell system.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram showing a configuration of a fuel cell system 10 mounted on a vehicle. The fuel cell system 10 includes a system main body 12 and a fuel cell control device 50 that controls each element of the system main body 12 as a whole. Since the fuel cell control device 50 also has a function of performing fuel cell deterioration determination, in this sense, it is a control device having a function as a fuel cell deterioration determination device.

  The system main body 12 includes a fuel cell main body called a fuel cell stack 14 in which a plurality of fuel cells are stacked, elements for supplying hydrogen gas arranged on the anode side of the fuel cell stack 14, and a cathode side. Each element for air supply is configured.

  The fuel cell stack 14 is formed by laminating a plurality of unit cells in which separators are arranged and sandwiched between both sides of an MEA (Membrane Electrode Assembly) in which catalyst electrode layers are arranged on both sides of an electrolyte membrane. Here, two sets of about 200 unit cells arranged in series are combined to output a voltage of about 200V to about 300V.

  The fuel cell stack 14 supplies a fuel gas such as hydrogen to the anode side, supplies an oxidizing gas containing oxygen, for example, air, to the cathode side, generates power by a cell chemical reaction through the electrolyte membrane, and extracts necessary power. Have

  Here, the catalyst electrode layer has a structure in which a catalyst layer and a diffusion electrode layer are further laminated. The catalyst layer is, for example, a layer containing Pt, which is oxidized with the progress of the electrochemical reaction of the fuel cell, and its catalytic ability is reduced, thereby causing a reduction in the output of the fuel cell. This oxidation of the catalyst layer is reduced by stopping the operation of the fuel cell, and the catalyst capacity is restored. Therefore, the output decrease of the fuel cell due to the oxidation of the catalyst layer is a recoverable temporary output decrease.

  On the other hand, for example, a carbon layer is used as the diffusion electrode layer, and disappearance and the like progress with the progress of the electrochemical reaction of the fuel cell, resulting in a decrease in the output of the fuel cell, which stops the operation of the fuel cell. Will not recover, resulting in an unrecoverable output drop. The deterioration of the fuel cell is caused not only by such deterioration of the carbon layer but also by aging of the electrolyte membrane.

  Returning to the configuration of FIG. 1, the hydrogen gas source 16 on the anode side is a tank for supplying hydrogen as a fuel gas. The regulator 18 connected to the hydrogen gas source 16 has a function of adjusting the gas from the hydrogen gas source 16 to an appropriate pressure and flow rate. The output port of the regulator 18 is connected to the anode side inlet flow path 20 of the fuel cell stack 14, and fuel gas adjusted to an appropriate pressure and flow rate is supplied to the fuel cell stack 14.

  The gas-liquid separator (G / L) 24 connected to the anode side outlet flow path 22 of the fuel cell stack 14 is configured such that the hydrogen gas that cannot be consumed by the fuel cell stack 14 and the moisture generated on the cathode side are MEA. The water that leaks to the cathode side through is separated. The water after gas-liquid separation is guided to the diluter 40.

  The circulation booster 26 provided on the downstream side of the gas-liquid separator 24 is a hydrogen pump having a function of increasing the hydrogen partial pressure of the gas-liquid separated gas and returning it to the anode-side inlet channel 20 for reuse.

  The cathode-side oxidizing gas source (AIR) 28 can actually use the atmosphere. The atmosphere as the oxidizing gas source 28 is supplied to the cathode side through the filter 30.

  An air compressor (ACP) 32 provided on the downstream side of the filter 30 is a gas booster that volume-compresses an oxidizing gas by a motor to increase its pressure. The output side of the ACP 32 is connected to the cathode side inlet channel 34.

  Further, the ACP 32 has a function of providing a predetermined amount of oxidizing gas by changing the rotation speed (the number of rotations per minute) under the control of the fuel cell control device 50. That is, when the required flow rate of the oxidizing gas is large, the rotational speed of the motor is increased. Conversely, when the required flow rate of the oxidizing gas is small, the rotational speed of the motor is decreased. Thus, the ACP 32 can adjust the amount of oxidizing gas supplied to the fuel cell stack 14 together with the pressure regulating valve 38 described later, and can control the power generation state of the fuel cell stack 14 by controlling these operations. .

  The pressure regulating valve 38 provided in the cathode side outlet flow path 36 is also called a back pressure valve, and is a valve having a function of adjusting the gas pressure at the cathode side outlet and adjusting the flow rate of the oxidizing gas to the fuel cell stack 14. A valve capable of adjusting the effective opening of the flow path can be used.

  The diluter 40 is a buffer container for collecting and manually mixing the exhaust and drainage from the anode side and the exhaust and drainage from the cathode side to dilute the hydrogen from the anode side and discharge it to the outside.

  The fuel cell stack 14 is provided with a set of generated power extraction terminals. The current detector 42 arranged in series on one side of a set of generated power extraction terminals is a device having a function of detecting a generated current. The detected current data is transmitted to the fuel cell control device 50 through an appropriate signal line. Moreover, the voltage detector 44 provided between one set of generated power extraction terminals is a device having a function of detecting a generated voltage. The detected voltage data is transmitted to the fuel cell control device 50 via an appropriate signal line.

  The other end of the generated power extraction terminal provided in the fuel cell stack 14 is connected to a load 46, whereby the power generated in the fuel cell stack 14 is supplied to the load. The final load is, for example, a rotating electrical machine or an electronic device mounted on the vehicle, but actually, the generated power from the fuel cell stack 14 is often temporarily stored in the secondary battery. Of course, even in this case, the rotating electric machine or the like can be directly driven by the generated power from the fuel cell stack 14.

  The system main body 12 is connected to the fuel cell control device 50 and operates under the control of the fuel cell control device 50. A storage device 60 is connected to the fuel cell control device 50, and an operation command interface 66 that acquires a fuel cell operation command from a general control unit (not shown), and a travel that acquires information indicating the travel status of the vehicle. A status interface 68 and a CAUTION interface 70 that outputs a caution signal (CAUTION) when the fuel cell stack 14 is deteriorated are provided.

  The storage device 60 has a function of storing a fuel cell control program executed by the fuel cell control device 50. In addition, the fuel cell control device 50 has a function of storing a map or the like used when executing the deterioration determination of the fuel cell stack 14, which is one of the functions.

  A deterioration threshold characteristic map 62, which is one of the maps stored in the storage device 60, obtains in advance a deterioration threshold characteristic in which the maximum output of the fuel cell stack 14 decreases as the cumulative operation amount increases from the start of the initial operation. Is a map. For example, the horizontal axis represents the cumulative operation amount, and the vertical axis represents the maximum output of the fuel cell stack 14. Since this map is a characteristic line indicating the state of the maximum output of the fuel cell stack 14 that decreases due to deterioration as the cumulative operation amount increases, this map can be called a deterioration threshold characteristic line.

  As will be described below, the cumulative driving amount of the horizontal axis can be taken as the cumulative traveling distance of the vehicle, the cumulative traveling time, the cumulative power generation time of the fuel cell stack 14, the cumulative power generation charge amount, etc. 62 includes a plurality of types of maps.

  The correction value relationship map 64, which is one of the maps stored in the storage device 60, has each operation as a trip until the fuel cell stack 14 starts operation and stops, with respect to the actual maximum output of each trip. It is a map used in order to obtain | require the corrected maximum output after returning the temporary output fall recovered | restored by the driving | operation stop as a correction value. The correction value relationship map 64 is obtained by mapping in advance the relationship between the trip characteristic value indicating the power generation status of each trip, the cumulative operation amount, and the correction value. For example, in a table in which the accumulated operation amount is arranged in the horizontal axis direction and the trip characteristic value is arranged in the vertical axis direction, the correction value corresponding to each combination of the accumulated operation amount and the trip characteristic value is a map in the format shown in the table. It can be.

  As described below, as the trip characteristic value, the travel distance of the vehicle during the trip, the travel time of the vehicle during the trip, the power generation time of the fuel cell stack 14 during the trip, and the generated charge amount of the fuel cell stack 14 during the trip can be taken. . Further, as described above, since the cumulative operation amount can take several types, the correction value relationship map 64 includes a plurality of maps formed by combinations thereof.

  The deterioration threshold characteristic and the correction value relationship may be expressed in a format other than the map and stored in the storage device 60. In the deterioration threshold characteristic, it is sufficient that the output of the fuel cell can be read out by inputting the accumulated operation amount. In the correction value relationship, the correction value is obtained by inputting the trip characteristic value and the accumulated operation amount. Anything that can be read out is acceptable. For example, the deterioration threshold characteristic may be stored in the storage device 60 in the form of a lookup table. Further, the deterioration threshold characteristic and the correction value relationship may be stored in the storage device 60 in the form of a calculation formula.

  The fuel cell control device 50 has a function of controlling the elements constituting the system main body 12 as a whole as described above. Specifically, the required generated power from the load 46 is acquired, the supply of fuel gas is controlled by the regulator 18, the supply of oxidizing gas is controlled by the ACP 32 and the pressure regulating valve 38, etc. It has a function. The fuel cell control device 50 particularly has a function of determining the degree of deterioration of the fuel cell stack 14. Such a fuel cell control device 50 can be configured by a computer or the like suitable for mounting on a vehicle. Further, the function of the fuel cell control device 50 can be a part of the function of another on-vehicle computer. For example, the function of the fuel cell control device 50 can be given to a hybrid ECU or the like that controls the entire vehicle.

  The fuel cell control device 50 includes an operation processing unit 52 that controls the operation of the system main body 12. Further, in order to determine the deterioration of the fuel cell stack 14, the corrected maximum after returning the temporary output decrease recovered by the stop of operation as the correction value with respect to the actual maximum output of the fuel cell stack 14 of each trip. A corrected output calculation processing unit 54 for obtaining an output, and a deterioration determination processing unit 56 that determines deterioration of the fuel cell stack 14 by comparing the corrected maximum output and a deterioration threshold characteristic line.

  The operation of the above configuration, in particular, each function relating to the fuel cell deterioration determination of the fuel cell control device 50 will be described in detail below. Here, the case where the trip distance, the amount of power generation, etc. are used as the trip characteristic value will be described with reference to FIGS. 2 to 10. The case where the time distribution of the voltage during the trip is used as the trip characteristic value is shown in FIG. Will be described with reference to FIG.

  FIG. 2 shows the deterioration of the fuel cell stack 14 using the characteristic line that takes the total travel distance of the vehicle on the horizontal axis and the output of the fuel cell stack when the throttle of the vehicle is fully opened on the vertical axis. It is a figure explaining a mode when it tries to perform determination. In FIG. 2, FC is an abbreviation for Fuel Cell, which is a fuel cell, and here is a fuel cell stack 14. Note that the output of the fuel cell is output power.

  When the throttle of the vehicle is fully opened, the accelerator pedal in the vehicle is fully depressed, and the so-called accelerator opening is 100%. This state corresponds to the maximum load of the fuel cell stack 14 when the vehicle is running with the power generated by the fuel cell stack 14. Since the output of the fuel cell stack 14 decreases as the load increases, it is preferable to use the maximum output, which is the output of the fuel cell stack 14 at the time of the maximum load, for use in the deterioration determination.

  The deterioration threshold characteristic line 72 is obtained by associating the output at the maximum load of the fuel cell stack 14 after excluding a recoverable temporary output decrease with the total travel distance, and can be obtained in advance by an experiment or the like. As shown in FIG. 2, the deterioration threshold characteristic line 72 has a characteristic that the maximum output of the fuel cell stack 14 decreases with an increase in the total travel distance that is the cumulative operation amount from the start of the initial operation. The obtained deterioration threshold characteristic line 72 is stored as a deterioration threshold characteristic map 62 of the storage device 60 and is read out as necessary.

  The black circles in FIG. 2 represent the output of the fuel cell stack 14 when the throttle is fully opened in each trip of the vehicle, that is, the actual maximum output in each trip. In the actual trip of the vehicle, for example, there are times when the throttle is fully opened about one to several times, so that the fuel cell control device 50 is notified of the point in time via the driving situation interface 68 from the overall control unit of the vehicle or the like. . The fuel cell control device 50 obtains the power at the time when the notification is received from the current obtained by the current detector 42 and the voltage obtained by the voltage detector 44 so as to obtain the power, so that the fuel when the throttle is fully opened in each trip is obtained. The output of the battery stack 14, i.e. the actual maximum output of each trip, can be obtained.

  FIG. 2 plots the output of the fuel cell stack 14 when a throttle is fully opened for each trip with black circle marks 74 in association with the total travel distance when the trip starts. In this example, the value of the output of the fuel cell stack 14 when the throttle is fully opened for eight trips is shown except for the data at the time of shipment.

  Note that information acquired via the travel status interface 68 described in FIG. 1 can be used as the travel distance in each trip, the total travel distance so far, and the like. Similarly, information acquired from the driving status interface 68, driving command timing acquired through the driving command interface 66, and the like can be used for the driving time described below.

  In FIG. 2, the value shown in parentheses is the travel distance of each trip. As shown here, the mileage on each trip varies. As described above, the use state of the fuel cell stack 14 in each trip is different in the total travel distance from the time of shipment, that is, in the cumulative use period, and also in the use period in the trip.

  When the actual maximum output of the fuel cell stack 14 is equal to or less than the deterioration threshold characteristic line 72, it means that abnormal deterioration exceeding the standard deterioration has progressed in the fuel cell stack 14. The deterioration threshold has such a meaning. In the example of FIG. 2, the data of four trips A, B, C, and D indicate outputs lower than the deterioration threshold characteristic line 72, respectively.

  By the way, the output decrease of the fuel cell stack 14 in each trip includes a recoverable temporary output decrease. The temporary output drop is not a deterioration because it is recovered at the next trip. In that sense, each black circle mark 74 in FIG. 2 indicates a state of output decrease of the fuel cell stack 14 before considering a recoverable temporary output decrease. Therefore, with the data in FIG. 2, it cannot be determined that A, B, C, and D indicate a deteriorated state.

  The recoverable temporary output drop in the fuel cell stack 14 has the following characteristics. That is, first, even if the total travel distance is the same, the longer the travel distance of the trip, the greater the range of recoverable temporary output decrease. This is because the longer the travel distance from the start to the end of the trip operation, the longer the electrochemical reaction time, and the longer the time, the more the oxidation of the catalyst progresses. Second, even if the trip distance is the same, the longer the total distance traveled, the greater the range of recoverable temporary output reduction. This is because the oxidation of the catalyst progresses rapidly as the aging of MEA progresses.

  Such recoverable temporary output reduction data can be obtained in advance through experiments or the like. The obtained data is stored in the correction value relation map 64 of the storage device 60 and can be read out as necessary. The correction value is because the maximum output of each trip excluding the temporary output decrease can be obtained by correcting this temporary output decrease to the actual maximum output of each trip.

  In the case of the example in FIG. 2, the relationship between the trip travel distance, the total travel distance, and the correction value is read from the correction value relationship map 64 of the storage device 60. FIG. 3 is a diagram showing an example of such a correction value relationship map. Here, in the table in which the total travel distance that is the cumulative driving amount is arranged in the horizontal axis direction and the trip travel distance that is the trip characteristic value is arranged in the vertical axis direction, it corresponds to each combination of the total travel distance and the trip travel distance. Correction values are shown.

  For example, the trip of A in FIG. 2 has a total travel distance of 10,000 km and a trip travel distance of 200 km, so that the correction value becomes 12 kW by reading the corresponding location in the correction value relation map of FIG. . This 12 kw is a value corresponding to a temporary output decrease. Therefore, by adding this 12 kW back to the actual maximum output of the trip of A, the maximum output excluding the temporary output decrease in the trip of A is obtained. These series of processing steps are executed by the function of the corrected output calculation processing unit 54 of the fuel cell control device 50 of FIG.

  4 reads out a correction value for the actual maximum output of each trip using the correction value relation map shown in FIG. 3, and indicates the maximum output after correction, which is a value calculated using the correction value, as a white circle mark. This is indicated by 76. The difference between the corrected maximum output indicated by the white circle mark 76 and the actual maximum output indicated by the black circle mark 74 corresponding thereto corresponds to a correction value in consideration of temporary output reduction.

  Since each white circle mark 76 in FIG. 4 indicates the maximum output excluding the influence of the temporary output decrease, by comparing this with the deterioration threshold characteristic line 72, whether or not deterioration has progressed in each trip. Can be determined. That is, when the white circle mark 76 shows the maximum output below the deterioration threshold characteristic line 72, the unrecoverable deterioration has abnormally progressed. In the example of FIG. 4, it is determined that abnormal deterioration is recognized when C is tripped. These process processes are executed by the function of the deterioration determination processing unit 56 of the fuel cell control device 50. If it is determined that abnormal deterioration is recognized, an appropriate CAUTION display or the like is output via the CAUTION interface 70.

  In the above, the total travel distance is taken as the cumulative operation amount. Instead, the total travel time can be taken as the cumulative operation amount. FIG. 5 is a diagram showing a deterioration threshold characteristic line 80 and a correction value relationship map 81 when the total travel time is used as the cumulative operation amount.

  As shown in FIG. 5, the deterioration threshold characteristic line 80 is obtained in advance based on the relationship between the FC output at the maximum load and the total traveling time. In this case, the FC output at the maximum load is the output of the fuel cell stack 14 when the throttle is fully opened, as described with reference to FIG. Corresponding to this, the correction value relationship map 81 uses the total travel time on the horizontal axis. These can be used by storing what is obtained in advance through experiments or the like in the storage device 60 and reading it out as necessary.

  In the above, an amount related to the traveling of the vehicle is used as the cumulative operation amount. Here, the running state of the vehicle is not constant and involves acceleration and deceleration. In this case, even if the travel distance or travel time is the same, the power generation status of the fuel cell stack 14 may differ depending on the travel state. Different power generation conditions can result in different degrees of temporary power loss.

  FIG. 6 is a diagram illustrating a result of an experiment on how the FC output is different due to a difference in the traveling state of the vehicle. Here, in the case of running at a constant speed of 80 km / h and in the case of alternately repeating 70 km / h and 90 km / h alternately, the total travel time and the total travel distance are made to be the same conditions, The result of an experiment on how the output of the fuel cell stack 14 changes with the passage of travel time is shown. The horizontal axis is the travel time, and the vertical axis is the output of the fuel cell stack 14.

  From the results shown in FIG. 6, the output drop after 3 hours after running at a constant speed of 80 km / h and the output drop after 1 hour by repeating alternately 70 km / h and 90 km / h are almost the same. It is the same. In other words, the repetition of traveling acceleration / deceleration has a greater degree of at least temporary output reduction than constant speed traveling. In the example of FIG. 6, there is a three-fold difference in travel time for the same output reduction.

7 and 8 are diagrams schematically explaining the reason why such a difference appears. In these figures, the horizontal axis represents time, and the vertical axis represents the amount of generated charge. FIG. 7 shows a case where the vehicle travels at a constant speed of 80 km / h, and FIG. 8 shows a case where 70 km / h and a speed of 90 km / h are alternately repeated.

  As shown in FIG. 7, when the vehicle travels at a constant speed of 80 km / h, there is no temporal change in the amount of generated power. On the other hand, as shown in FIG. 8, when alternating speed of 70 km / h and speed of 90 km / h are alternately repeated, acceleration / deceleration is repeated, so that the amount of generated power is rapidly increased and decreased alternately. It will be. For vehicles, the average speed is 80 km / h in both FIG. 7 and FIG. 8, but repeated acceleration / deceleration requires more power as a whole due to the effects of vehicle inertia, accelerator operation, brake operation, etc. Therefore, it can be considered that the total amount of generated power increases.

  In consideration of the result of FIG. 6, depending on the actual running state of the vehicle, it may be preferable to use the accumulated power generation amount of the fuel cell stack 14 or the accumulated power generation time as the accumulated operation amount. FIGS. 9 and 10 show deterioration threshold characteristic lines in the case where deterioration determination is performed using the total power generation time and the total power generation amount of the fuel cell stack 14 as the cumulative operation amount instead of the total travel distance and total travel time of the vehicle. It is a figure explaining a correction value relation map.

  FIG. 9 shows a case where the total power generation time is used as the cumulative operation amount. At this time, as shown in FIG. 9, the deterioration threshold characteristic line 82 is obtained in advance in relation to the FC output at the maximum load and the total power generation time. Correspondingly, a correction value relationship map 83 is used in which the horizontal axis represents the total power generation time and the vertical axis represents the trip power generation time. These can be used by storing what is obtained in advance through experiments or the like in the storage device 60 and reading it out as necessary.

  FIG. 10 shows a case where the total generated charge amount is used as the cumulative operation amount. At this time, as shown in FIG. 10, the deterioration threshold characteristic line 84 is obtained in advance in relation to the FC output at the maximum load and the total generated charge amount. Correspondingly, the correction value relationship map 85 uses the total generated charge amount on the horizontal axis and the trip generated charge amount on the vertical axis. These can be used by storing what is obtained in advance through experiments or the like in the storage device 60 and reading it out as necessary.

  In this case, in the deterioration determination, it is necessary to obtain the generated electric charge amount in each trip. This is because the electric charge amount as an integral value of the current is obtained using the current value acquired by the current detector 42 and the elapsed time. Can be obtained by calculating.

  As described above, the case where the trip distance, the amount of power generation, etc. are used as the trip characteristic value has been described. Next, the case where the time distribution of the voltage during trip is used as the trip characteristic value is shown in FIG. 17 will be used for explanation.

  The oxidation of the catalyst is affected by the power generation potential of the fuel cell stack 14, that is, the output voltage. That is, when the output voltage of the fuel cell stack 14 is high, oxidation proceeds, and when the output voltage becomes low to some extent, the reduction starts. Therefore, when the output voltage of the fuel cell stack 14 is high, the width of the temporary output decrease becomes large, and when the output voltage is low, the width of the temporary output decrease becomes small. In some cases, the temporary output voltage decreases due to reduction. Will be returned. The voltage dependency of this oxidation is also related to the aging of the MEA. For example, even if the output voltage is the same, the oxidation of the catalyst proceeds more rapidly as the total travel distance is longer.

  From these facts, it is possible to determine the influence of the temporary output decrease in consideration of the voltage dependency of the oxidation of the catalyst. Here, the deterioration determination in consideration of the voltage dependency will be described with reference to the deterioration threshold characteristic line 72 similar to FIG. 1 and FIG. 11 showing the data of the maximum output in each trip. FIG. 11 is similar to FIG. 1 except that the trip mileage is not taken into account here. In FIG. 11, black circle marks 74 below the deterioration threshold characteristic line 72 relate to four trips A, B, C, and D. In the following description, A and C are taken as examples.

  12 and 13 are diagrams showing time distributions of the output voltage of the fuel cell stack 14 in trips A and C, respectively. The time distribution of output voltage is obtained by dividing the elapsed time of each trip into unit times, obtaining the output voltage in each unit time, and summing up how many unit times have the same output voltage, for each output voltage. What calculated | required distribution of the total time obtained in can be used.

  12 and 13, the horizontal axis represents the output voltage of the fuel cell stack 14, the cell voltage that is the voltage between the terminals of a typical unit cell is taken in 0.1 V increments, and the vertical axis represents each cell voltage. The total unit time is taken. In the above example, since about 200 fuel cell stacks 14 are connected in series, the output voltage of the fuel cell stack 14 is about 200 times the cell voltage.

  The unit time was 1 second. That is, the cell voltage, which is the voltage between the terminals of the unit cell, is measured in 1 second increments from the start to the end of each trip, and the data is distributed by summing the corresponding unit times for each cell voltage increment. .

  As shown in FIG. 12, the trip of A has 20 seconds of operation when the cell voltage is between 0.5V and 0.6V, 140 seconds of operation between 0.6V and 0.7V, and 0. There are 480 seconds of operation between 7V and 0.8V, 720 seconds of operation between 0.8V and 0.9V, and 650 seconds of operation between 0.9V and 1.0V.

  Similarly, as shown in FIG. 13, in the trip of C, the total operation time at each cell voltage is shown. Here, there is no operation with a cell voltage of 0.6 V or less, for example, an operation between 0.8 V and 0.9 V is 950 seconds, and an operation between 0.9 V and 1.0 V is 890 seconds. Thus, the total trip time in the region where the cell voltage is high is longer in the trip of C than in the trip of A.

  The influence of the cell voltage on the maximum output of the fuel cell stack 14 is shown in the correction value relationship map shown in FIG. Here, in the table in which the total travel distance that is the cumulative operation amount is arranged in the horizontal axis direction and the cell voltage that is the trip characteristic value is arranged in the vertical axis direction, the correction value corresponding to each combination of the total travel distance and the cell voltage It is shown. Here, the correction value is − (negative) when oxidation proceeds and temporarily decreases, and + (positive) when temporary output decrease is returned by reduction.

  As shown in FIG. 14, it can be seen that the higher the cell voltage, the larger the temporary output decrease, and even if the cell voltage is the same, the temporary output decrease during the trip increases as the total travel distance increases.

  The corrected maximum output is calculated by obtaining the temporary output decrease amount using the time distribution of the voltage in the trip described with reference to FIGS. 12 and 13 and the correction value relationship map of FIG. FIG. 15 is a diagram illustrating calculation related to A trip, and FIG. 16 is a diagram illustrating calculation related to C trip.

  Since the trip of A has a total travel distance of 10,000 km, the correction value for each cell voltage for the travel distance is picked up from the correction value relation map of FIG. And the total output time in each cell voltage obtained from the result of FIG. 12 is multiplied, and the temporary output fall amount in each cell voltage is calculated, respectively. For example, in FIG. 15, the influence on the output in which the cell voltage is a correction value exceeding 0.9V and 1.0V or less is −0.010 kw / s from FIG. 14, and the total operation time at the cell voltage is FIG. Therefore, the temporary output decrease amount at the cell voltage is (−0.010) × 650 = −6.5 kw.

  When such a calculation is performed for each cell voltage and the whole is totaled, a temporary output decrease amount in the entire trip of A is calculated. The calculation result in FIG. 15 is −6.5 kw.

  Similarly, using FIG. 13 and FIG. 14, the temporary output reduction amount in the entire trip of C is −20.78 kW as shown in FIG. 16.

  FIG. 17 is a diagram showing how the maximum output after correction is obtained using the correction value obtained in this way. The white circle mark 75 is the maximum output after correction, and the black circle mark 74 is the actual maximum output of each trip before correction. The difference between the white circle mark and the black circle mark is a correction value of voltage dependency. In the trip of A, since the temporary output decrease is −6.5 kw as calculated in FIG. 15, this value is returned to the maximum output of the black circle mark, specifically, the sign is inverted and +6.5 kw is set to the black circle. Add to the mark value to make a white circle mark. Here, the vertical axis in FIG. 17 is the output for a single cell.

  Similarly, in the trip of C, since the temporary output decrease is −20.78 kW as calculated in FIG. 15, this value is returned to the maximum output of the black circle mark, specifically, the sign is inverted and +20 .78kw is added to the value of the black circle mark to make a white circle mark. For other trips, a correction value is calculated in the same manner, and this is added to the value of the black circle mark to obtain a white circle mark as the maximum output after correction.

  Next, as described with reference to FIG. 4, the deterioration threshold characteristic line 72 and the corrected maximum output of each trip are compared, and deterioration determination for each trip is performed. In the example of FIG. 17, since only the trip A is the corrected maximum output is equal to or less than the degradation threshold characteristic line 72, it is determined that abnormal degradation has progressed in this trip. When it is determined that there is an abnormal deterioration, an output such as an appropriate CAUTION display is performed via the CAUTION interface 70.

  In this way, using the correction value related map based on the trip characteristic value and the cumulative operating amount, calculate the temporary output decrease at each lip and obtain the corrected maximum output and compare it with the deterioration threshold characteristic line. This makes it possible to determine the deterioration of the fuel cell stack 14 more accurately.

  Further, according to the above configuration, instead of removing the fuel cell stack 14 or the vehicle from the normal operation state and performing the deterioration determination as in the periodic inspection, the normal operation state of the fuel cell stack 14 or the normal operation of the vehicle is not performed. In the running state, it is possible to determine the deterioration in real time.

  The fuel cell deterioration determination device according to the present invention can be used for determination of deterioration of a fuel cell accompanied by a recoverable temporary output drop such as catalyst oxidation.

  DESCRIPTION OF SYMBOLS 10 Fuel cell system, 12 System main-body part, 14 Fuel cell stack, 16 Hydrogen gas source, 18 Regulator, 20 Anode side inlet flow path, 22 Anode side outlet flow path, 24 Gas-liquid separator, 26 Circulation booster, 28 Oxidation Gas source, 30 filter, 32 ACP, 34 cathode side inlet flow path, 36 cathode side outlet flow path, 38 pressure regulating valve, 40 diluter, 42 current detector, 44 voltage detector, 46 load, 50 fuel cell control device, 52 driving processing unit, 54 corrected output calculation processing unit, 56 deterioration determination processing unit, 60 storage device, 62 deterioration threshold value characteristic map, 64, 81, 83, 85 correction value relation map, 66 driving command interface, 68 driving situation interface , 70 CAUTION interface, 72, 80, 82, 84 Deterioration threshold characteristic line, 7 A black circle mark, 75 and 76 open circles mark.

Claims (6)

A deterioration threshold characteristic storage means for preliminarily obtaining and storing a deterioration threshold characteristic line in which the reference condition output, which is the output of the fuel cell under a predetermined reference output condition, decreases with an increase in the cumulative operation amount from the start of the initial operation;
Each operation until the fuel cell starts operation and stops is regarded as each trip, and after correcting the temporary output decrease recovered by operation stop as a correction value for the actual reference condition output of each trip Means for obtaining a reference condition output;
A determination means for determining deterioration of the fuel cell from a comparison between the deterioration threshold characteristic line and the corrected reference condition output;
With
The means for obtaining the corrected reference condition output is:
Correction value storage means for preliminarily obtaining and storing the relationship between the trip characteristic value indicating the progress of oxidation of the catalyst of the fuel cell in each trip, the cumulative operation amount, and the correction value;
Means for obtaining a correction value determined by the trip characteristic value and the cumulative operation amount based on the relationship stored in the correction value storage means;
And determining a corrected reference condition output based on the acquired correction value. A deterioration threshold characteristic storage means for preliminarily obtaining and storing a deterioration threshold characteristic line in which the reference condition output, which is the output of the fuel cell under a predetermined reference output condition, decreases with an increase in the cumulative operation amount from the start of the initial operation;
Each operation until the fuel cell starts operation and stops is regarded as each trip, and after correcting the temporary output decrease recovered by operation stop as a correction value for the actual reference condition output of each trip Means for obtaining a reference condition output;
A determination means for determining deterioration of the fuel cell from a comparison between the deterioration threshold characteristic line and the corrected reference condition output;
With
The means for obtaining the corrected reference condition output is:
The trip operating time is used as a trip characteristic value that indicates the power generation status of each trip.The longer the trip operating time, the larger the temporary output decrease and the increase in the cumulative operating amount from the start of the initial operation. Correction value storage means for preliminarily obtaining and storing a relationship regarding the correction value based on the relationship in which the temporary output decrease is increased
Means for obtaining a correction value determined by the trip characteristic value and the cumulative operation amount based on the relationship stored in the correction value storage means;
And determining a corrected reference condition output based on the acquired correction value . A deterioration threshold characteristic storage means for preliminarily obtaining and storing a deterioration threshold characteristic line in which the reference condition output, which is the output of the fuel cell under a predetermined reference output condition, decreases with an increase in the cumulative operation amount from the start of the initial operation;
Each operation until the fuel cell starts operation and stops is regarded as each trip, and after correcting the temporary output decrease recovered by operation stop as a correction value for the actual reference condition output of each trip Means for obtaining a reference condition output;
A determination means for determining deterioration of the fuel cell from a comparison between the deterioration threshold characteristic line and the corrected reference condition output;
With
The means for obtaining the corrected reference condition output is:
As the trip characteristic value indicating the power generation status of each trip, the time distribution of the output voltage, which is the distribution obtained by dividing the elapsed time of each trip into unit time and obtaining each output voltage, is temporary as the output voltage becomes higher Correction value storage means for preliminarily obtaining and storing a relationship relating to a correction value based on a relationship in which the output decrease is large and a relationship in which the temporary output decrease in the trip increases with an increase in the cumulative operation amount from the start of the initial operation ,
Means for obtaining a correction value determined by the trip characteristic value and the cumulative operation amount based on the relationship stored in the correction value storage means;
And determining a corrected reference condition output based on the acquired correction value . In the fuel cell degradation determination device according to any one of claims 1 to 3,
The deterioration threshold characteristic storage means
Deterioration threshold obtained based on the relationship that the standard condition output of the fuel cell decreases as the cumulative power generation amount or cumulative power generation time increases, using the cumulative power generation amount or cumulative power generation time from the start of the initial operation as the cumulative operation amount A fuel cell deterioration determination device, characterized by storing a characteristic line. In the fuel cell degradation determination device according to any one of claims 1 to 3,
The deterioration threshold characteristic storage means
When the fuel cell is used for vehicle travel, the cumulative travel distance or cumulative travel time from the start of the initial operation is used as the cumulative driving amount, and the reference condition output of the fuel cell is increased as the cumulative travel distance or cumulative travel time increases. A fuel cell deterioration determination device, wherein a deterioration threshold characteristic line obtained based on a decreasing relationship is stored. In the fuel cell deterioration determination device according to claim 2,
The correction value storage means
When the fuel cell is used for vehicle travel, the trip travel distance or travel time is used as the trip characteristic value. The longer the trip travel distance or travel time, the greater the temporary output decrease, and the cumulative travel distance or cumulative A fuel cell deterioration determination device characterized in that a relationship related to a correction value is obtained and stored in advance based on a relationship in which a temporary output decrease during a trip increases as travel time increases.

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