Energy supply system for power vehicle, power vehicle and method for operating energy supply system

Abstract

The invention relates to an energy supply system (10) for a power vehicle, comprising a fuel cell system (20) having at least one fuel cell (22), an energy storage device (30) and a control device (40) which is designed to determine whether at least one predetermined condition is met, and limiting the generated power of the fuel cell system (20) at a maximum power if the at least one condition is met, where the at least one condition comprises the control device (40) receiving a first signal (42) representative of the reverse travel of the powered vehicle (100). The technique also relates to a powered vehicle comprising the energy supply system, a method for operating an energy supply system for a powered vehicle, a computer program product and a computer readable medium.

Description

Technical Field

[0001] The technology disclosed herein relates to an energy supply system for a powered vehicle, in particular for a powered vehicle including a fuel cell, a powered vehicle including the energy supply system, a method for operating the energy supply system, a computer program product including instructions for executing the method, and a computer-readable medium including the computer program product. Background Art

[0002] Modern, at least sometimes electrically driven vehicles, in particular fuel cell vehicles, generally have an energy supply system for supplying electric drive means with electric current. In fuel cell vehicles, the energy supply system generally comprises a plurality of fuel cells, which generate electric current by an electrochemical reaction of a fuel with an oxidant, such as oxygen from the air. The power provided by the fuel cells can generally be controlled by means of operating parameters of the fuel cells. In order to be able to respond dynamically to drive load requirements, it is also known to provide the energy supply system with an electric buffer store, for example a battery. Summary of the invention

[0003] A preferred task of the technology disclosed here is to reduce or eliminate at least one disadvantage of previously known solutions or to propose an alternative solution. In particular, a preferred task of the technology disclosed here is to provide an energy supply system for a powered vehicle, which enables the male / female driver of the powered vehicle to drive in reverse with the best possible visibility. In addition, the task of the present invention is to provide a corresponding powered vehicle, a corresponding method for operating an energy supply system for a powered vehicle, a corresponding computer program product and a corresponding computer-readable medium. Further preferred tasks can be derived from the advantageous effects of the technology disclosed here.

[0004] The object(s) are achieved by the technical solution of claim 1 and the other independent patent claims. The dependent claims constitute preferred embodiments.

[0005] According to one aspect, an energy supply system for a powered vehicle / motor vehicle, in particular a land, water or air vehicle (preferably a passenger car or a commercial vehicle) is proposed, the energy supply system comprising a fuel cell system with at least one fuel cell, an energy storage device and a control device. The control device is designed to determine whether at least one predetermined condition is met, and if the at least one condition is met, the power generation power of the fuel cell system is limited to the maximum power. The at least one condition includes the control device receiving a first signal representing the reverse driving of the powered vehicle. That is, the control device can limit the electric power that can be generated by the fuel cell system in response to receiving the first signal, so that the electric power is as large as the maximum power. If the electric power of the fuel cell is the control variable of the fuel cell, then the maximum power can be the controllable maximum electric (rated) power.

[0006] This makes it possible to reduce in a simple manner the obstruction of vision caused by water vapor during the relatively slow reverse travel of the motor vehicle. Since the amount of water vapor generated in the fuel cell system is essentially proportional to the electrical power generated by the fuel cell system, the power limitation results in less water vapor being generated and having to be discharged to the environment of the motor vehicle. As a result, the end of the exhaust line on the environment side can be arranged more flexibly on the motor vehicle, in particular in the rear area. Since the generation of water vapor is in fact limited, complex additional measures to reduce the humidity of the exhaust gas during reverse travel can be omitted.

[0007] The energy storage device is preferably configured as an electrical energy storage device. It may include at least one electrical energy storage device, in particular a capacitive or electrochemical energy storage device. The energy storage device is configured as a closed system here so that it can be charged purely by input current. It can be arranged to buffer the electrical energy from the fuel cell system (i.e., a so-called buffer storage device). The energy storage device preferably includes a plurality of energy storage cells (battery cells). The energy storage device is preferably configured as a high-voltage storage device. The rated voltage of the energy storage device may be at least 300V or at least 350V. In addition, the energy storage device may include at least one supercapacitor ("Supercap").

[0008] If the (at least) one condition includes multiple conditions, these conditions can be based on the corresponding signals received by means of the control device. The control device can receive a first signal from a power vehicle, in particular from a power vehicle controller of the power vehicle. The same content can apply to all signals explained below, in particular the second signal, the third and / or the fourth signal. The reverse travel represented by the first signal can be any speed in principle. Therefore, in the context of the present disclosure, the stationary state of the power vehicle with the reverse gear engaged can also be understood as (imminent) reverse travel.

[0009] The control device may also be designed to receive a second signal including speed information. The speed information may include the driving speed of the powered vehicle (in the reverse direction) and / or the wind speed in the powered vehicle environment. The driving speed may be an absolute speed. The control device may determine whether the driving speed (in absolute value) is less than a (positive) driving speed threshold. In this case, the at least one condition may also include that the driving speed is less than the driving speed threshold. In other words, when the control device receives the first signal (first condition) and determines that the driving speed is less than the driving speed threshold (second condition; "slow reverse driving" situation), the power generation power of the fuel cell system may be limited by the maximum power. What is said about the driving speed applies similarly to the wind speed.

[0010] Here, the driving speed threshold value can be predetermined or can be modifiable by means of the control device. In particular, the control device can be arranged to determine the driving speed threshold value based on the ambient temperature and / or ambient air humidity of the energy supply system or the power vehicle. Here, the control device can receive the ambient temperature or the ambient air humidity as information of the power vehicle. The determination can be preferably carried out by the control device in such a way that the driving speed threshold value (up to which the power limitation is actually activated) is lower at a first ambient temperature than at a second ambient temperature, wherein the first ambient temperature is lower than the second ambient temperature. This advantageous embodiment is based on the recognition that, at higher speeds (due to the faster circulation of the power vehicle) and / or at higher temperatures, the obstruction of vision due to the possible emission of water vapor is smaller. In other words, the higher the temperature, the slower the power vehicle can be driven in reverse, while the driver's vision is not obstructed when the power output (and thus the water output) of the fuel cell is high.

[0011] In another variant, the control device is designed to receive a third signal (of the powered vehicle) representing the operation of the powered vehicle trailer. The at least one condition may also include that the powered vehicle is outside the trailer operation. Here, the following operation of the powered vehicle can be understood as trailer operation, in which the trailer is connected to the powered vehicle in a signal-transmitting manner. That is to say, the control device can be designed to limit the generated power of the fuel cell system only by the maximum power as long as no trailer is connected to the powered vehicle in a signal-transmitting manner. Since the powered vehicle has an increased power demand in trailer operation due to the load of the trailer and at the same time the trailer limits the field of view to the rear, it may be advantageous that in this case the electrical power of the fuel cell system is not additionally limited.

[0012] Furthermore, the at least one condition may include that the state of charge of the energy storage device is greater than a state of charge threshold value. The state of charge (SOC) of the energy storage device can be determined by means of the control device. It is preferably stored in the control device as a relative value (percentage). This makes it possible to provide the desired electrical power to the power vehicle relatively uninterruptedly even if the power vehicle has traveled a long distance when reversing.

[0013] As already mentioned, the energy supply system can receive the ambient temperature and / or the ambient air humidity as information of the powered vehicle. This / these parameter values ​​can be transmitted in the form of a fourth signal by at least one corresponding device of the powered vehicle, preferably continuously, to the control device of the energy supply system. Other conditions can be based on the ambient temperature and / or the ambient air humidity. In particular, the at least one condition can include that the ambient temperature is below a temperature threshold value and / or that the ambient air humidity is above a humidity threshold value. The temperature threshold value and / or the humidity threshold value can be simply predetermined or determined by means of the control device based on other parameters (for example, the driving speed of the powered vehicle).

[0014] The maximum power can be predetermined in absolute terms (fixed) or can be determined in absolute terms by means of a control device, in particular based on the ambient temperature of the vehicle or the ambient air humidity. In particular, the maximum power can be a maximum of 2 kW or a maximum of 1 kW or a maximum of 0.5 kW or zero. Thus, if the at least one condition (in the case of a plurality of conditions: each of the conditions) is met, the fuel cell system can be operated such that the electrical power generated by the fuel cell system is not greater than 2 kW, 1 kW or 0.5 kW or is switched off so that no current is generated (maximum power: zero).

[0015] In order to end the limitation of the generated power, the control device can be designed to continuously / sequentially determine whether the at least one condition is still satisfied. Once the at least one condition (i.e. at least one of the above conditions, in particular the first signal is no longer received) is no longer (no longer) satisfied, the control device can cancel the limitation of the generated power. If the control device receives a signal opposite to the first, second, third or fourth signal, the at least one condition is no longer satisfied. This can be the case, for example, when the control device receives a signal representing forward movement after receiving the first signal. Therefore, in response to receiving the signal representing forward movement, the control device can control the fuel cell system to cancel the power limitation by the maximum power.

[0016] In the sense of the present disclosure, control by a control device (operation) may also include closed-loop control in the sense of closed-loop control technology. In particular, the control device may be designed for closed-loop control of the electric power to be generated by the fuel cell system. Therefore, the electric power may be a closed-loop control variable here. In order to control the electric power, the control device may be designed for manipulating the so-called balance of equipment (BOP) components of the fuel cell system. These BOP components are all the components of the fuel cell system except the fuel cell itself. They can be divided into an anode subsystem, a cathode subsystem and a thermal subsystem.

[0017] The BOP components may include, in particular: a battery monitoring system for monitoring the state of the at least one fuel cell; an anode supply path for establishing a fluid connection between at least one fuel source and the anode of the at least one fuel cell; anode-side shut-off valves, which can close the at least one fuel cell in a gas-tight manner (except for leakage flows) relative to the remaining components of the anode subsystem; a recirculation system for recirculating the fuel through the at least one fuel cell; at least one anode flushing valve for flushing the anode subsystem; at least one water separator in the exhaust gas path of the fuel cell system; at least one recirculation conveyor and / or at least one pump for conveying fuel to the anode supply path. In the cathode subsystem of the fuel cell system, a compressor as an oxidant conveyor, a cathode supply path for establishing a fluid connection between the at least one oxidant conveyor and the cathode of the fuel cell stack and / or at least one charge air cooler may be provided. A cooling water pump, an air-water heat exchanger and a cation exchange cartridge may belong to the thermal subsystem which can be controlled by means of a control device.

[0018] The fuel cell system can be supplied with fuel, in particular hydrogen, from a fuel reservoir, wherein the fuel reservoir can be designed in particular as a pressure vessel system for a power vehicle. A pressure vessel system can be used to store fuels that are gaseous under ambient conditions.

[0019] The power vehicle proposed here comprises an energy supply system and (at least) one drive motor as described in detail above. The at least one drive motor can be coupled or coupled to the drive wheel of the power vehicle to drive the drive wheel. The electric motor can also be controlled by means of a control device. The energy supply system is configured to supply current to the drive motor. In addition, the power vehicle may include at least one controller (so-called power vehicle controller), which is designed to transmit a first, second, third and / or fourth signal (wirelessly or wired) to the control device. That is to say, the control device of the energy supply system can receive any information / signal described as being received in the present disclosure from the at least one power vehicle controller. The on-board (on-board) power grid (of the power vehicle) supplied with current by the energy supply system may include a plurality of electrical consumers (e.g. sensors, actuators, lights, displays (so-called display screens) and entertainment systems).

[0020] The energy supply system is preferably configured to supply the drive motor at least sometimes only or at least 90% (almost only) with electrical power from the energy storage device (i.e., not current from the fuel cell system or with less than 10% of electrical power from the fuel cell system) if at least one condition, in particular all conditions, is met. In principle, this function can be implemented in a balanced or realistic manner. In a balanced variant, the fuel cell system can at least sometimes output to the onboard power supply as much electrical power as the drive motor consumes at the same time. In a realistic variant, the drive motor can be decoupled from the fuel cell system by means of a switching device (which can, for example, include at least one relay and / or at least one diode). The remaining electrical power required for driving the powered vehicle can accordingly be completely or almost completely input to the drive motor from the energy storage device.

[0021] As long as the fuel cell system still outputs current to the onboard power supply, the fuel cell system can be used to operate the remaining electrical consumers of the onboard power supply. That is to say, the energy supply system (especially the control device) is preferably configured to control the fuel cell system so as to output to the onboard power supply at most as much electrical power as is consumed (consumed) by all electrical consumers of the onboard power supply except the drive motor. In other words, if at least one of the conditions is met, the control device can switch off the fuel cell or idle it. Energy for forward movement can then be taken from the energy storage device. Idle can mean that the fuel cell system generates only as much current as is required by the onboard power supply to maintain its comfort functions (display, radio, interior heating, etc.).

[0022] The energy supply system provides the advantage that relatively little exhaust humidity is generated during reverse driving. Accordingly, the vehicle can have an exhaust line which is connected to the at least one fuel cell in a fluid-conducting manner and which opens into the environment of the vehicle at its end opposite the fuel cell. Advantageously, when developing the vehicle, this end can be positioned relatively freely on the vehicle without the driver's field of vision being significantly impaired by escaping water vapor. In particular, the end opposite the fuel cell can be arranged at the rear of the vehicle.

[0023] An energy supply system for a powered vehicle, in particular the energy supply system described in detail above, is operated by means of the method proposed here. As described above, the energy supply system has a fuel cell system with at least one fuel cell, an energy storage device and a control device. The method comprises the following steps, which are preferably performed in the following order: determining whether at least one predetermined condition is met, the condition comprising the control device receiving a first signal representing reverse driving of the powered vehicle; and if the at least one condition is met, limiting the generated power of the fuel cell system to a maximum power.

[0024] Furthermore, the method can have as method steps any of the above-mentioned features, in particular all features, in particular functions, of the energy supply system or of the powered vehicle.

[0025] The computer program product proposed here contains instructions that cause the energy supply system, in particular the control device, to execute the method steps also described above. In particular, instructions can be provided so that the control device controls the energy supply system, in particular the fuel cell system, according to the method. The computer program product is stored on a computer-readable medium proposed here, for example a data carrier (for example a hard disk or a USB stick).

[0026] In other words, the technology disclosed here can relate to a fuel cell electric vehicle (FCEV) which is supplied with energy from the high pressure storage device only when driving in reverse. The fuel cell is therefore not used for forward and backward driving, but only for forward driving. This has the advantage when driving in reverse that the water vapor in the exhaust gas does not obstruct the driver's field of vision, especially when driving slowly under high load (e.g. uphill).

[0027] In the operating strategy of a fuel cell vehicle, when reverse gear is engaged, the fuel cell is switched off or idled, and the energy for forward motion is taken from the high-pressure accumulator. Idle preferably means that the fuel cell only generates as much current as the onboard electrical system requires to maintain its comfort functions (display, radio, interior heating, etc.). Reverse travel is usually short, so that the relatively low energy of the high-pressure accumulator in a fuel cell vehicle is sufficient for this.

[0028] If the vehicle detects the presence of a trailer, the field of vision may be restricted. In this case, it is not necessary to shut down the fuel cell system (especially the fuel cell). If the vehicle detects strong winds from the acceleration sensor, it is not necessary to shut down the fuel cell system (especially the fuel cell), because the wind can carry water vapor away from the field of vision. If the vehicle speed exceeds a certain value when driving in reverse, the field of vision is no longer impeded by water vapor and traction energy can be obtained from the fuel cell system (especially the fuel cell).

[0029] During longer reverse travel, the high-pressure accumulator is eventually depleted. In this case, provision can be made to reactivate the fuel cell system. The obstruction of vision due to water vapor depends on the ambient temperature and the ambient humidity. If the vehicle can provide this information, it is preferably taken into account in the operating strategy so that in the event of severe obstruction of vision, the fuel cell system (in particular the fuel cell) is shut down or closed-loop controlled to a lower power. Obstruction of vision is thus reduced or even prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technology disclosed herein will now be explained with reference to the accompanying drawings. These drawings are schematic and not to scale:

[0031] Figure 1 A first variant of an energy supply system is shown;

[0032] Figure 2 A second variant of the energy supply system is shown;

[0033] Figure 3 A powered vehicle is shown with an energy supply system; and

[0034] Figure 4 Shown for running Figure 1 Method for energy supply system in. DETAILED DESCRIPTION

[0035] Figure 1 An energy supply system is shown, which is configured to Figure 3In the power vehicle / motor vehicle 100 (passenger car) shown in the figure, that is, for the purpose of supplying electric energy to the power vehicle 100. In order to generate this electric energy, the energy supply system 10 includes a fuel cell system 20-the fuel cell system includes at least one fuel cell 22, preferably a plurality of stacked fuel cells 22-and an energy storage device 30 and a control device 40. The energy storage device 30 is designed as a high-voltage storage device with a rated voltage exceeding 300V.

[0036] The control device 40 Figure 1 In a variant of the embodiment, the embodiment is configured to be connected to at least one power vehicle controller 104 (of the power vehicle 100), while Figure 3 The power vehicle 100 is correspondingly connected to the at least one power vehicle controller 104. The control device 40 can receive a first signal 42 from the at least one power vehicle controller 104, the first signal representing the reverse travel of the power vehicle 100.

[0037] The control device 40 can determine whether at least one (predetermined) condition is met. The at least one condition may include a first condition. The first condition may be for receiving a first signal 42. That is, if (once and / or as long as) the control device 40 receives the first signal 42, the first condition is met; and if the control device 40 does not receive the first signal or receives a signal opposite to the first signal, the first condition is not met. The control device 40 is also designed to limit the power generation of the fuel cell system 20 by the maximum power when the at least one condition is met. That is, in response to receiving the first signal 42, the control device 40 limits the operation of the fuel cell system 20 so that the fuel cell 22 is operated at maximum power, preferably at a lower electrical power. For this purpose, the control device controls the BOP component 24 and, if necessary, the fuel storage 26 of the fuel cell system 20 accordingly. The maximum power is, for example, 1 kilowatt and is just enough to supply sufficient electrical power to the onboard power grid 106 in addition to one drive motor 102 or multiple drive motors of the power vehicle 100.

[0038] As soon as the control device 40 no longer receives the first signal 42 or receives another signal representing the end of reverse travel, the first condition is no longer met and the control device 40 again cancels the limitation of the generated power. This ensures not only good visibility during reverse travel but also high power during forward travel.

[0039] Figure 2 Another energy supply system 10 in Figure 1The energy supply system 10 in the embodiment of the present invention is different in that the control device 40 limits the generated power only when a plurality of conditions including the first condition are satisfied. For this purpose, the control device is configured to receive a second signal 44, a third signal 46 and / or a fourth signal 48 in addition to the first signal 42. In a modification of the energy supply system 10, the second, third and fourth signals 44, 46 and 48 can be provided individually or in any combination.

[0040] The second, third and fourth signals 44, 46 and 48 may be provided by the at least one powered vehicle controller 104. Here, the second signal 44 may include speed information about the driving speed of the powered vehicle 100. Alternatively or additionally to this, the second signal 44 may represent the wind present in the environment. On this basis, the control device 40 may determine whether the driving speed is less than a driving speed threshold. Accordingly, the second condition may include that the driving speed is less than the driving speed threshold. If the control device 40 has information about the (current) ambient temperature of the powered vehicle 100, the control device may determine the driving speed threshold based on the ambient temperature of the powered vehicle 100.

[0041] The third signal 46 may represent the current trailer operation of the power vehicle 100. The control device 40 utilizes the third signal 46 so that as long as the power vehicle 100 is in trailer operation, the control device treats the third condition therein as not satisfied. That is, the control device 40 limits the power of the fuel cell system 20 under the third condition (when the first condition is satisfied), and the third condition includes that the power vehicle 100 is outside the trailer operation.

[0042] In the fourth signal 48, the control device 40 can receive the ambient temperature and / or ambient air humidity of the energy supply system 10 / power vehicle 100 from the power vehicle 100. The fourth condition therein includes, on this basis, that the ambient temperature is lower than a predetermined temperature threshold and / or the ambient air humidity is higher than a predetermined humidity threshold. In addition, the fifth condition therein can be based on the state of charge of the energy storage device. This fifth condition may include that the state of charge of the energy storage device 30 is greater than a predetermined state of charge threshold. Therefore, the power limitation of the fuel cell system 20 will only be carried out when the energy storage device 30 is sufficiently charged. Therefore, the power vehicle 100 can be driven relatively uninterruptedly.

[0043] also, Figure 2 The energy supply system 10 comprises Figure 1 All features of the energy supply system 10 in.

[0044] Figure 3 Shows the installation with the ability to run Figure 1 and Figure 2A powered vehicle / motor vehicle 100 having an energy supply system 10 of one of the above. In addition to the energy supply system 10, the powered vehicle 100 also includes at least one drive motor 102, which is supplied with electrical energy by means of the energy supply system 10 during operation. A powered vehicle controller 104 is configured to transmit a first, second, third and / or fourth signal 42, 44, 46, 48 to a control device 40 of the energy supply system 10. Other electrical consumers of the powered vehicle 100 are connected to the energy supply system 10 via an onboard power supply system 106 which also includes the drive motor 102. An exhaust pipe 108, which is connected to the at least one fuel cell 22 in a fluid-conducting manner, leads with its end 110 opposite to the fuel cell 22 into the environment of the powered vehicle 100. This end is arranged at the rear of the powered vehicle 100 (see Figure 3 ).

[0045] Advantageously, if at least one of the conditions, in particular at least the first condition and to a lesser extent the second, third and / or fourth condition, is met, the drive motor 102 is supplied with only or at least 90% of the electrical power from the energy storage device 30 by means of the control device 40 when the energy supply system 10 is actuated. On the other hand, the fuel cell system 20 is actuated by means of the control device 40 to at least sometimes output to the onboard power supply system 106 at most as much electrical power as is consumed / consumed by all electrical consumers of the onboard power supply system 106 except the drive motor 102 (i.e. preferably all electrical consumers of the power vehicle 100 except the drive motor 102). For this purpose, the at least one fuel cell 22 can be controlled in a closed-loop manner based on the power of the drive motor 102 accordingly.

[0046] exist Figure 4 The method for operating, in particular in a vehicle 100, is shown in FIG. Figure 1 or Figure 2 Method 200 for an energy supply system 10 in a power vehicle 10. In the method 200, in a first step 202, it is determined whether at least one of the above conditions is met. In particular, it is determined whether the control device 40 receives a first signal 42 representing that the power vehicle 100 is traveling in reverse. Subsequently, if the at least one condition is met, step 204 is performed. In step 204, the power generation capacity of the fuel cell system 20 is limited by the maximum power, that is, the fuel cell system 20 is controlled in such a way that it does not generate electrical power exceeding the maximum power. Other method steps that are provided in the middle may correspond to the functions of the energy supply system 10 or the power vehicle 100. The method can be implemented on a computer with the aid of a computer program product containing corresponding instructions. The computer program product can be stored on a computer-readable medium.

[0047] For reasons of readability, the expression "at least one" is partially omitted in the present disclosure for simplicity. If a feature of the technology disclosed herein is described in a singular or indefinite form (e.g., a fuel cell, a condition, a signal, etc.), the corresponding plural form should also be disclosed at the same time (e.g., the at least one fuel cell, the at least one condition, the at least one signal, etc.). "At least one" means one or more. In the present disclosure, "at least partially" means partially or completely.

[0048] The foregoing description of the present invention is for illustrative purposes only, not for limiting purposes of the present invention. Various changes and modifications may be made within the framework of the present invention without departing from the scope of the present invention and its equivalents.

Claims

1. An energy supply system (10) for a powered vehicle (100), include: A fuel cell system (20) having at least one fuel cell (22), an energy storage device (30), and A control device (40) is designed to: determining whether at least one predetermined condition is satisfied, and If at least one of the conditions is met, the power generation of the fuel cell system (20) is limited to a maximum power, The at least one condition includes the control device (40) receiving a first signal (42) representing reverse travel of the powered vehicle (100).

2. The energy supply system (10) according to claim 1, in, The control device (40) is further designed to receive a second signal (44) having speed information about the driving speed of the powered vehicle (100) and to determine whether the driving speed is less than a driving speed threshold. The at least one condition also includes a driving speed being less than a driving speed threshold.

3. The energy supply system (10) according to claim 2, in, The control device (40) is configured to determine a travel speed threshold value based on an ambient temperature of the powered vehicle (100).

4. The energy supply system (10) according to claim 1, in, The control device (40) is also designed to receive a third signal (46) representing the operation of a trailer of the powered vehicle (100), The at least one condition also includes the powered vehicle (100) being outside of a trailer operation.

5. Energy supply system (10) according to one of the preceding claims, in, The at least one condition includes a state of charge of the energy storage device (30) being greater than a state of charge threshold.

6. Energy supply system (10) according to one of the preceding claims, in, The at least one condition includes that the ambient temperature of the energy supply system (10) is below a temperature threshold and / or the ambient humidity is above a humidity threshold.

7. Energy supply system (10) according to one of the preceding claims, in, The maximum power is a maximum of 2 kW, a maximum of 1 kW, a maximum of 0.5 kW, or zero.

8. A powered vehicle (100) comprising an energy supply system (10) according to one of the preceding claims and a drive motor (102), in, The energy supply system (10) is configured to supply electric current to a drive motor (102).

9. The powered vehicle (100) of claim 8, further comprising a powered vehicle controller (104) configured to transmit at least the first signal (42) to a control device (40) of the energy supply system (10).

10. The powered vehicle (100) according to claim 8 or 9, in, The energy supply system (10) is configured to supply the drive motor (102) with electrical power from the energy storage device (30) only or at least 90% when the at least one condition is met.

11. The powered vehicle (100) according to any one of the three preceding claims, further comprising an on-board electrical network (106) having a plurality of electrical consumers, in, The energy supply system (10) is configured to control the fuel cell system (20) to at least sometimes output to the vehicle electrical system (106) an amount of electrical power which is at most as much as the electrical power consumed by all electrical consumers of the vehicle electrical system (106) except the drive motor (102).

12. The power vehicle (100) according to one of the four preceding claims further comprises an exhaust pipe (108) connected to the at least one fuel cell (22) in a fluid-conducting manner, the exhaust pipe leading into the environment of the power vehicle (100) at its end (110) opposite to the fuel cell (22), the end opposite to the fuel cell (22) being arranged at the rear of the power vehicle (100).

13. A method (200) for operating an energy supply system (10) for a powered vehicle (100), the energy supply system (10) comprising a fuel cell system (20) with at least one fuel cell (22), an energy storage device (30) and a control device (40), in, The method comprises the following steps: determining whether at least one predetermined condition is satisfied, the condition comprising the control device (40) receiving a first signal (42) representing reverse travel of the powered vehicle (100); and If the at least one condition is met, the power generation capacity of the fuel cell system (20) is limited to the maximum power.

14. Computer program product comprising instructions for causing an energy supply system (10) according to one of claims 1 to 12 to execute the method steps according to claim 13.

15. Computer readable medium on which a computer program product according to claim 14 is stored.

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