Method and control device for operating a fuel cell device for a vehicle

Abstract

The invention relates to a method for operating a fuel cell device (100) for a vehicle (190). The fuel cell device (100) has at least one fuel cell for providing electrical energy from hydrogen and oxygen, a hydrogen circulation system (120) for transporting hydrogen from a tank (137) via a fuel cell stack (105), a water separator (125) having a drain valve (127), a jet pump (130) and a recirculation fan (135) for conveying the hydrogen into the hydrogen circulation system (120). The method comprises a step of reading in a status signal and a step of outputting a control signal. In the reading-in step, the status signal is read in, wherein the status signal indicates a failure of the recirculation fan (135). In the outputting step, the control signal for controlling the recirculation fan (135) and / or a conveying unit (150) for conveying a mass flow through the jet pump (130) is output in response to the status signal.

Description

[0001] R. 416017

[0002] - 1 -

[0003] Description

[0004] title

[0005] Method and control device for operating a fuel cell device for a vehicle, method and control device for operating a vehicle and fuel cell device

[0006] State of the art

[0007] The invention relates to a method and a control device for operating a fuel cell device for a vehicle, to a method and a control device for operating a vehicle, and to a fuel cell device according to the preamble of the independent claims. The present invention also relates to a computer program.

[0008] Fuel cells convert a fuel, such as hydrogen, and oxygen into electrical energy, heat, and water. The fuel is supplied to an anode and the oxygen to a cathode, with the anode and cathode separated by a membrane, such as a polymer electrolyte membrane (PEM). In practical applications, to increase power output, multiple fuel cells are stacked and connected to form a fuel cell stack. Supply channels throughout the fuel cell stack provide the necessary media to the fuel cells. The waste media is removed via waste channels running through the fuel cell stack.

[0009] Disclosure of the invention

[0010] Against this background, the approach presented here provides a method for operating a fuel cell device for a vehicle, a control device that uses this method, and a method for operating R. 416017.

[0011] - 2 - of a vehicle, furthermore a control device which uses this method and a fuel cell device and finally a corresponding computer program according to the main claims. Advantageous further developments and improvements of the device specified in the independent claim are possible through the measures listed in the dependent claims.

[0012] The advantages achievable with the approach presented here lie particularly in the creation of a method that ensures the safe operation of the fuel cell system, and thus the vehicle, in the event of a component failure. This component is the recirculation blower.

[0013] A method for operating a fuel cell device for a vehicle is presented. The fuel cell device comprises at least one fuel cell for generating electrical energy from hydrogen and oxygen, a hydrogen recirculation system for transporting hydrogen from a tank via a fuel cell stack, a water separator with a drain valve, a jet pump, and a recirculation blower for supplying the hydrogen to the hydrogen recirculation system. The method includes a step for reading a status signal and a step for outputting a control signal. In the reading step, the status signal is read, where the status signal represents a failure of the recirculation blower.In the output step, the control signal for controlling the recirculation blower and / or a pumping unit for pumping a mass flow through the jet pump is output, responding to the status signal.

[0014] The fuel cell device can also be referred to as a fuel cell system. The fuel cell stack can contain multiple fuel cells. The water separator can store or discharge separated water. This water can be discharged by opening the drain valve. The method presented here can be actively applied in a fuel cell system with anode gas recirculation by means of the recirculation blower, which can also be referred to as a blower. The passive jet pump, R. 416017

[0015] - 3 - which can also be referred to as a jet pump, is connected in series. With the approach presented here, unrestricted maximum load operation can be ensured in the event of a failure of the recirculation blower, which can also be referred to as the anode recirculation blower, allowing the vehicle to continue driving without delay. This can increase the service life of the fuel cell device. The approach presented here can also be described as a fuel cell system with a flexible operating strategy to increase reliability.

[0016] During the output step, the control signal for activating the recirculation fan can be output in such a way that the recirculation fan can be restarted after a failure. More precisely, one of the recirculation fan's motors can be started.

[0017] During the output stage, the control signal for the pumping unit can be output in such a way that the mass flow rate through the jet pump can be increased. In other words, passive recirculation of the recirculation blower can be controlled.

[0018] In the output step, the control signal for controlling the pumping unit can be output in such a way that the mass flow through the jet pump can be permanently and / or continuously increased.

[0019] During the output step, the control signal for the pumping unit can be output in such a way that the mass flow rate through the jet pump can be increased by 15 to 40 percent. This mass flow rate increase can be permanent and / or continuous.

[0020] In the output step, the control signal for controlling the pumping unit can be output such that the mass flow rate through the jet pump is increased during a pumping time interval and / or a pumping pulse, in particular whereby the mass flow rate through the jet pump can be reduced or suppressed outside the pumping time interval and / or the pumping pulse. R. 416017

[0021] - 4 -

[0022] The procedure may include a step of providing a warning signal. This warning signal can be sent to a vehicle component and / or an output unit, responding to the status signal. For example, the warning signal can be used to activate a service light. This way, a user can be informed of a recirculation fan failure, which can increase user satisfaction and vehicle safety. Additionally or alternatively, the operation in this mode can be time-limited.

[0023] The procedure may include a step of resetting the status signal if the recirculation fan is found to be operating correctly. For example, after a recirculation fan restart or repair.

[0024] Furthermore, a method for operating a vehicle is presented, comprising the steps of an embodiment of the method described herein. The method includes a step of modifying the power consumption of another vehicle component in response to the control signal, particularly when the control signal causes an increase in the mass flow rate through the jet pump. The other component could be, for example, a motor, a battery, and / or a heater. This modification step can be used, for instance, to adapt the vehicle's hybrid strategy by shifting current rates or charging limits for the duration of a failure. In this way, the vehicle's safety can be enhanced.

[0025] These methods can be implemented, for example, in software or hardware, or in a hybrid form of software and hardware, for example in a control unit.

[0026] The approach presented here further provides a control device designed to carry out, control, or implement the steps of a variant of one of the methods presented here in corresponding facilities. This embodiment of the invention, in the form of a control device R. 416017, also achieves this.

[0027] - 5 - the problem underlying the invention can be solved quickly and efficiently.

[0028] For this purpose, the control device can have at least one processing unit for processing signals or data, at least one storage unit for storing signals or data, at least one interface to a sensor or actuator for reading sensor signals from the sensor or for outputting data or control signals to the actuator, and / or at least one communication interface for reading or outputting data embedded in a communication protocol. The processing unit can be, for example, a signal processor, a microcontroller, or the like, and the storage unit can be flash memory or a magnetic storage device.The communication interface can be configured to read or output data wirelessly and / or via wired connections, whereby a communication interface that can read or output wired data can, for example, read this data electrically or optically from or output it into a corresponding data transmission line.

[0029] In this context, a control device can be understood as an electrical device that processes sensor signals and outputs control and / or data signals accordingly. The device may have an interface, which can be implemented in hardware and / or software. In the case of a hardware-based interface, the interfaces can, for example, be part of a so-called system ASIC, which incorporates various functions of the control device. However, it is also possible that the interfaces are separate integrated circuits or at least partially comprised of discrete components. In the case of a software-based interface, the interfaces can be software modules, which, for example, are located on a microcontroller alongside other software modules.

[0030] A fuel cell device comprises an embodiment of a control device presented herein. R. 416017

[0031] - 6 -

[0032] Also advantageous is a computer program product or computer program with program code that can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and is used to carry out, implement and / or control the steps of the method according to one of the embodiments described above, in particular if the program product or program is executed on a computer or a control device.

[0033] Examples of the approach presented here are shown in the drawings and explained in more detail in the following description. It shows:

[0034] Fig. 1 shows a schematic representation of an embodiment of a fuel cell device;

[0035] Fig. 2 is a diagram illustrating an embodiment of a method for operating a fuel cell device;

[0036] Fig. 3 shows a flowchart of an embodiment of a method for operating a fuel cell device;

[0037] Fig. 4 shows a block diagram of an embodiment of a control device for operating a fuel cell device;

[0038] Fig. 5 shows a flowchart of an embodiment of a method for operating a vehicle; and

[0039] Fig. 6 shows a block diagram of an exemplary embodiment of a control device for operating a vehicle.

[0040] In the following description of advantageous embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and having a similar effect, thus omitting a repeated description of these elements. R. 416017

[0041] - 7 -

[0042] Fig. 1 shows a schematic representation of an embodiment of a fuel cell device 100. The fuel cell device 100 comprises at least one fuel cell for providing electrical energy from hydrogen and oxygen. A plurality of fuel cells, i.e., a fuel cell stack 105, is shown here. The fuel cell stack 105 can also be referred to as a fuel cell unit and comprises an anode 110, a cathode 115, and additionally an electrical connection 117 and a cooling circuit connection 119.

[0043] Furthermore, the fuel cell device 100 has a hydrogen circulation system 120 for transporting hydrogen from a tank 137 via the fuel cell stack 105, a water separator 125 with a drain valve 127, a jet pump 130 and a recirculation blower 135 for conveying the hydrogen into the hydrogen circulation system 120.

[0044] The anode 110 is supplied with anode gas, in this case hydrogen, via the hydrogen cycle system 120. The hydrogen is taken from a tank 137, fed to a heat exchanger 140, and supplied to a pumping unit 150 via a system shut-off valve 145. The pumping unit 150 has a hydrogen metering valve 155 and the jet pump 130. The hydrogen is supplied to the jet pump 130 via the hydrogen metering valve 155. The jet pump 130 passively recirculates the anode gas, which still contains hydrogen, exiting the fuel cell stack 105. The recirculation blower 135 is integrated into the hydrogen cycle system 120 to assist the jet pump 130. The recirculation blower 135 is part of a recirculation unit 160. The recirculation unit 160 includes the recirculation blower 135, a motor 165, a recirculation water separator 170, and a recirculation drain valve 175.The recirculation blower 135 is arranged between the motor 165 and the recirculation water separator 170, with the motor 165 being supplied with energy via a rectifier 177 and converter 178.

[0045] The recirculation water separator 170, for example, is designed to separate and store the liquid water contained in the recirculated anode gas. Since the storage tank fills up over time, it must be cleaned periodically. R. 416017

[0046] - 8 - be emptied. For this purpose, the recirculation drain valve 175 is provided on the storage tank. When the storage tank is completely emptied, the recirculation drain valve 175 can be used to flush or purge the hydrogen cycle system 120. The recirculation drain valve 175 is connected on its outlet side to a cathode-side exhaust line 150, so that the anode gas discharged from the hydrogen cycle system 120 mixes in the exhaust line 150 with the exhaust air from the cathode 115 already present there.

[0047] The drain valve 127 and the recirculation drain valve 175 are connected, for example, on the outlet side via a connecting line 180 to the cathode-side exhaust line 150 and open into a vehicle exhaust system 185. The fuel cell device 100 presented here is intended for a vehicle 190 and is shown in Fig. 1 as an example only. The fuel cell device 100 therefore has a fuel cell control unit 192, and the vehicle 190 has a vehicle control unit 194, with both control units 192 and 194 communicating with each other. The anode-side components together form an anode subsystem 195. Thus, Fig. 1 shows an arrangement of the recirculation blower 135, abbreviated ARB, with water separator 125 and purge and drain functions in the anode subsystem 195.

[0048] The recirculation process is explained below.

[0049] Since the fuel exiting the fuel cells still contains residual fuel, the depleted fuel exiting the fuel cells is recirculated, meaning it is fed back into the fuel cells via the hydrogen cycle system 120, which can also be referred to as the anode circuit. Recirculation occurs passively with the aid of the jet pump 130 integrated into the hydrogen cycle system 120 and / or actively with the aid of the recirculation blower 135 integrated into the hydrogen cycle system 120. Because the recirculated anode gas can contain liquid water, the water separator 125 is integrated into the hydrogen cycle system 120. In addition to its separation function, this separator typically also serves to store the separated water. When the storage tank is full, water is discharged by opening a valve, the so-called drain valve 127.Water discharged via drain valve 127 is then usually removed from the system together with anode exhaust gas. R. 416017.

[0050] - 9 -

[0051] The following explains the functionality of the fuel cell device 100.

[0052] Polymer electrolyte membrane (PEM) fuel cell systems convert hydrogen into electrical energy using oxygen, generating waste heat and water in the process. Converting hydrogen in this context means that hydrogen molecules are consumed or removed at the anode.

[0053] The PEM fuel cell consists of the anode 110, which is supplied with hydrogen, the cathode 115, which is supplied with air, and the polymer electrolyte membrane positioned between them. In practical applications, several of these individual fuel cells are stacked to increase the generated electrical voltage. Within this stack 105, there are supply channels that provide the individual cells with hydrogen and air, and that remove the depleted humid air and the depleted anode exhaust gas.

[0054] The depleted anode exhaust gas still contains large amounts of hydrogen and is therefore returned to the stack inlet; this process is called recirculation. This occurs within the recirculation path. Recirculation can be achieved actively using a recirculation blower 135 and / or passively using a jet pump 150, or as a combination of both pumps in parallel or series.

[0055] Special water separators 125, 170 are used to separate liquid water from the gaseous part of the anode exhaust gas. In addition to the separation function, the separator 125, 170 also has the task of storing the separated water. When the storage tank is full, the water is discharged by opening a so-called drain valve 127, 175. Separation occurs, for example, at the outlet of the stack anode 110.

[0056] Nitrogen enters the anode compartment through diffusion processes. Another source of nitrogen is the fresh fuel, which does not consist of 100% pure H2. Nitrogen is an inert gas for the fuel cell, reducing the cell voltage and thus the stack voltage, which in turn reduces the R. 416017

[0057] - 10 -

[0058] Efficiency losses mean that gas is repeatedly vented from the anode compartment during a driving cycle to reduce the nitrogen content. This venting is done, for example, with a so-called purge valve.

[0059] Fresh hydrogen is supplied, for example, by means of hydrogen metering valves 155, which can be designed as proportional valves or switching valves. The control strategy involves using these valves to regulate the gas pressure within the anode path, measured by a pressure sensor at a defined position, to a defined target pressure depending on the system operating point. The valves required for venting nitrogen and water, or a combined valve, are mounted, for example, in a device of the recirculation path. The operating range of a fuel cell device 100 has an optimum with regard to service life. If the fuel cell device 100 is operated outside of these parameters, its service life may be reduced.

[0060] An important parameter for achieving this optimum is the recirculation of anode gas. This recirculation is responsible, on the one hand, for providing moisture at the anode inlet and thus preventing the membrane from drying out. On the other hand, the lambda value at the anode inlet is set by means of the anode gas recirculation. The recirculation capacity of the jet pump 150 depends, among other things, on the anode gas composition and the supplied motive mass flow rate, which in turn is proportional to the stack flow rate and thus linked to the operating point. Depending on the gas concentration, the jet pump 150 supplies the fuel cell stack 105, which can also be referred to as the stack, with more or less anode gas. In some combinations, this can lead to operation in damaging ranges.To extend the operating range in the lower partial load range, for example, pulsed operation of the hydrogen supply is carried out in the hydrogen circuit system 120. In the event of a failure of the recirculation blower 135 of the fuel cell device 100, normal operation must be stopped for safety and service life reasons, without affecting the availability of the vehicle 190. R. 416017.

[0061] - 11 -

[0062] The purpose of the approach presented here is to continue the operation of the fuel cell system in the event of a failure of the recirculation blower 135 of the fuel cell device 100 by restricting the operating range, by increasing the minimum load to safe operation with passive recirculation by the jet pump 150 after the failure has been detected, or alternatively by switching to pulsed operation of the supply valve.

[0063] Should the recirculation blower 135 of the anode subsystem 195 fail, the following procedure will be followed:

[0064] First, a failure of the recirculation fan 135 is detected. In response, a first backup action is taken by attempting to restart the motor 165. If this is unsuccessful, a second backup action is taken by switching to passive recirculation.

[0065] For passive recirculation, there are two options, for example: Either the minimum load of the fuel cell device 100 is increased to, for example, 15 to 40 percent of the maximum load. Additionally or alternatively, the minimum load of the fuel cell device 100 is increased and the hydrogen dosing is switched to discontinuous "pulsed" operation.

[0066] According to one embodiment, a service indicator light is also switched on in the driver's display, and operation in this mode may be limited to a certain time. By way of example only, the hybrid strategy of the vehicle 190 is adjusted, for instance by shifting current rates or charging limits for the duration of the failure. After a repair of the recirculation fan 135, for example, the fuel cell device 100 returns to unrestricted operation.

[0067] Fig. 2 shows a diagram 200 to illustrate an embodiment of a method for operating a fuel cell device with a passive recirculation pump.

[0068] The abscissa 205 shows the motive mass flow rate, and the ordinate 210 shows the recirculation rate of the jet pump. The recirculation rate of the jet pump depends, among other things, on the anode gas composition R. 416017

[0069] - 12 - and the supplied motive mass flow rate, which in turn is proportional to the stack flow rate and thus coupled to the operating point. At high hydrogen concentrations, the jet pump is capable of operating at lower system operating points, which are, however, higher than in an actively recirculating system. As the hydrogen concentration decreases, the lower operating limit (solid black line) also decreases. Therefore, especially in the arrangement with a jet pump and blower, only the lower operating points should be excluded. With pulsed operation of the jet pump, the lower limit of the load point can be lower than with continuous operation, but this has disadvantages regarding the system's service life. This is an alternative operating mode for the system.

[0070] Fig. 3 shows a flowchart of an embodiment of a method 300 for operating a fuel cell device. The fuel cell device is, for example, the fuel cell device described in Fig. 1 or a similar fuel cell device.

[0071] Procedure 300 comprises step 305 of reading a status signal and step 310 of outputting a control signal. Optionally, procedure 300 includes step 315 of providing a warning signal and / or step 320 of resetting the status signal.

[0072] For example, in an operational state of the fuel cell device 100, the recirculation fan fails. In step 305 of the readout process, the status signal representing this failure is read.

[0073] In step 310 of the output, the control signal for controlling the recirculation blower and / or a pumping unit for pumping a mass flow through the jet pump is output, responding to the status signal.

[0074] According to one embodiment, in step 310 of the output process, the control signal is output in such a way as to re-control the recirculation blower. For example, the motor of the recirculation blower is re-controlled. R. 416017

[0075] - 13 -

[0076] Additionally or alternatively, in step 310 of the output process, the control signal for controlling the pumping unit is output in such a way that the mass flow rate through the jet pump is increased. For example, the minimum mass flow rate required for operation is increased by 15 to 40 percent. Furthermore, the mass flow rate is increased permanently and / or continuously.

[0077] According to one embodiment, in step 310 of the output process, the control signal for controlling the pumping unit is output in such a way that the mass flow rate through the jet pump is increased during a pumping time interval and / or a pumping pulse. Specifically, outside of the pumping time interval and / or the pumping pulse, the mass flow rate through the jet pump is reduced or suppressed.

[0078] In step 315 of the deployment process, the warning signal is sent to a component of the vehicle and / or to an output unit when the failure of the recirculation blower is detected, i.e., in response to the status signal.

[0079] In step 320 of the reset process, the status signal is reset when the recirculation blower is functioning correctly again, for example after the recirculation blower motor was restarted in step 310 of the control process.

[0080] Fig. 4 shows a block diagram of an embodiment of a control device 400 for operating a fuel cell device. The control device 400 is configured to control and / or execute the method from Fig. 3 or a similar method.

[0081] The control device 400 includes a unit 405 for reading a status signal 408, a unit 410 for outputting a control signal 412, and optionally a unit 415 for providing a warning signal 418 and a unit 420 for resetting the status signal 408. R. 416017

[0082] - 14 -

[0083] Unit 405 is designed to read the status signal 408. The status signal 408 represents a failure of the recirculation fan.

[0084] The output unit 410 is designed to output the control signal 412 for controlling the recirculation blower and / or a conveying unit for conveying a mass flow through the jet pump, responding to the status signal 408.

[0085] According to one embodiment, unit 410 is configured to output the control signal 412 in such a way that the recirculation blower is activated again. For example, the motor of the recirculation blower is activated again.

[0086] Additionally or alternatively, unit 410 is configured to output the control signal 412 for controlling the pumping unit in such a way that the mass flow rate through the jet pump is increased. For example, the mass flow rate is increased by 15 to 40 percent. Furthermore, the mass flow rate can be increased permanently and / or continuously.

[0087] According to one embodiment, the unit 410 is configured to output the control signal 412 for controlling the pumping unit such that the mass flow rate through the jet pump is increased during a pumping time interval and / or a pumping pulse. In particular, outside of the pumping time interval and / or the pumping pulse, the mass flow rate through the jet pump is reduced or suppressed.

[0088] The supply unit 415 is designed to output the warning signal 418 to a component 425 of the vehicle and / or to an output unit 430. The warning signal 418 is output, for example, when the failure of the recirculation blower is detected, i.e., in response to the status signal 408. R. 416017

[0089] - 15 -

[0090] The reset unit 420 is designed to reset the status signal 408 when the recirculation blower is functioning correctly again, for example, after the recirculation blower motor has been restarted.

[0091] Fig. 5 shows a flowchart of an embodiment of a method 500 for operating a vehicle. The method 500 is carried out using the method from Fig. 3. More precisely, the method 500 is carried out with steps of the method from Fig. 3.

[0092] Method 500 includes step 505 of changing the power consumption of another vehicle component in response to the control signal. This is particularly relevant when the control signal causes an increase in the mass flow rate through the jet pump.

[0093] The other component is, for example, a motor, a battery, and / or a heater. Step 505, the modification step, adjusts the vehicle's hybrid strategy, for instance, by shifting current rates or charging limits for the duration of the failure.

[0094] Fig. 6 shows a block diagram of an embodiment of a control device 600 for operating a vehicle. The control device 600 is designed to control and / or execute the method from Fig. 5 or a similar method.

[0095] For this purpose, the control device 600 includes a unit 605 for changing the power consumption of another component of the vehicle, responding to the control signal. This is particularly relevant when the control signal causes an increase in the mass flow rate through the jet pump.

[0096] If an embodiment includes an “and / or” connection between a first feature and a second feature, this is to be read as meaning that the embodiment according to one embodiment has both the first feature and the second feature, and according to another embodiment either only the first feature or only the second feature.

Claims

R. 416017 - 16 - Claims 1. Method (300) for operating a fuel cell device (100) for a vehicle (190), wherein the fuel cell device (100) comprises at least one fuel cell for providing electrical energy from hydrogen and oxygen, a hydrogen circulation system (120) for transporting hydrogen from a tank (137) via a fuel cell stack (105), a water separator (125) with a drain valve (127), a jet pump (130) and a recirculation blower (135) for conveying the hydrogen into the hydrogen circulation system (120), wherein the method (300) comprises the following steps: Reading (305) a status signal (408) representing a failure of the recirculation fan (135); and Output (310) of a control signal (412) to control the recirculation blower (135) and / or a pumping unit (150) to pump a mass flow through the jet pump (130), responding to the status signal.

2. Method (300) according to claim 1, wherein in step (310) of output the control signal (412) for controlling the recirculation fan (135) is output in such a way that the recirculation fan (135) is controlled again after the failure.

3. Method (300) according to one of the preceding claims, wherein in step (310) of output the control signal (412) for controlling the conveying unit (150) is output in such a way that the mass flow flowing through the jet pump (130) is increased. R. 416017 - 17 - 4. Method (300) according to claim 3, wherein in step (310) of output the control signal (412) for controlling the conveying unit (150) is output in such a way that the mass flow flowing through the jet pump (130) is permanently and / or continuously increased.

5. Method (300) according to claim 4, wherein in step (310) of output the control signal (412) for controlling the conveying unit (150) is output in such a way that the mass flow through the jet pump (130) is increased by 15 to 40 percent.

6. Method (300) according to one of the preceding claims, wherein in step (310) of output the control signal (412) for controlling the pumping unit (150) is output such that the mass flow through the jet pump (130) is increased in a pumping time interval and / or a pumping pulse, in particular wherein outside the pumping time interval and / or the pumping pulse the mass flow through the jet pump (130) is reduced or suppressed.

7. Method (300) according to one of the preceding claims, comprising a step (315) of providing a warning message signal (418) to a component of the vehicle (190) and / or an output unit, responding to the status signal.

8. Method (300) according to one of the preceding claims, comprising a step (320) of resetting the status signal (408) when operation of the recirculation blower (135) is recognized as error-free.

9. Method (500) for operating a vehicle (190) comprising the steps of method (300) according to any one of claims 1 to 8, wherein the method (500) includes a step (505) of changing a power consumption of a further component of the vehicle (190) in response to the control signal (412), in particular when the control signal (412) causes an increase in the mass flow through the jet pump (130). R. 416017 - 18 - 10. Control device (400; 600) configured to perform and / or control the steps of the methods (300; 500) according to any one of the preceding claims 1 to 8 and according to claim 9 in corresponding units.

11. Fuel cell device (100) with a control device (400; 600) according to claim 10.

12. Computer program configured to execute and / or control the steps of the methods (300; 500) according to any of the preceding claims.

13. Machine-readable storage medium on which the computer program according to claim 12 is stored.

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