Abstract: The invention relates to a heat exchanger system for operating a fuel cell stack, comprising: —a first compressor and a second compressor for the cathode gas fed to the fuel cell stack, the second compressor being fluidically downstream of the first compressor; —a turbine, which is mechanically coupled to the second compressor and against which the cathode gas discharged from the fuel cell stack flows; —a first heat exchanger, which is thermally coupled to the fed cathode gas between the first compressor and the second compressor; —a second heat exchanger, which is thermally coupled to the fed cathode gas downstream of the second compressor; —a fourth heat exchanger, which is thermally coupled to the discharged cathode gas downstream of the turbine; wherein the fourth heat exchanger is thermally variably coupled to the first heat exchanger and to the second heat exchanger in order to control a heat exchange for cooling the first heat exchanger and the second heat exchanger.

Abstract: A computer-implemented method for a time-controlled delivery of updatable services to on-board systems of vehicles which use the services. The method includes analyzing the detected data to identify delivery time periods for the updatable services being optimal for each vehicle which uses the services, wherein the network usage of the backend server is optimally allotted to the specified time period on the basis of the availability of the data connection of the vehicles using the services to the backend server. A system for a time-controlled delivery of updatable services to on-board systems of vehicles that use the services is also disclosed.

Abstract: The invention relates to a method for operating a fuel cell system (100), wherein the fuel cell system (100) comprises the following components: at least one fuel cell stack (101), and a cathode system (10) for supplying a reactant containing oxygen to the at least one fuel cell stack (101) in the form of supply air (L1), wherein the cathode system (10) comprises the following components: at least one supply air line (11) for supplying supply air (L1) to the at least one fuel cell stack (101) and at least one exhaust line (12) for discharging exhaust air (L2) from the at least one fuel cell stack (101), wherein a compression unit (KE) is provided in the at least one supply air line (11) for compressing supply air (L1), wherein an air connection (LV) is provided from an exhaust air (L2) to supply air (L1) between the at least one exhaust line (12) and the at least one supply air line (11) of the cathode path (10), and wherein the air connection (LV) is used to provide intermittent exhaust gas recirculat

Abstract: The invention relates to a method for starting a compressor assembly of a fuel cell system, the compressor assembly comprising an electrically operable first compressor and a downstream second compressor, which is coupled, by means of a rotor, to a turbine disposed in a cathode path of the fuel cell system, and the method comprising the steps of starting the first compressor and accelerating the first compressor to a first rotational speed at least corresponding to an idling rotational speed of the first compressor, selecting a first rotational speed gradient from a first and a second rotational speed gradient value, wherein the first rotational speed gradient value exceeds the second rotational speed gradient value, accelerating the first compressor from the first rotational speed to a second rotational speed with the first rotational speed gradient, examining, during the acceleration to the second rotational speed, whether the rotor rotates freely or whether the rotor is blocked, accelerating the first comp

Abstract: A fuel cell system comprises a first fuel cell stack pair with a first fuel cell stack and a second fuel cell stack, a first compressor arrangement, and a first turbine arrangement, wherein the first compressor arrangement can be coupled to cathode inlets of the fuel cell stack of the first fuel cell stack pair, wherein the first turbine arrangement can be coupled to cathode outlets of the fuel cell stack of the first fuel cell stack pair, wherein the first turbine arrangement comprises a shaft, a first turbine which is connected to the shaft, a second turbine which is connected to the shaft, and a generator which is connected to the shaft, wherein the first compressor arrangement comprises at least one electrically operable compressor, and wherein the generator can be coupled to the at least one electrically operable compressor.

Abstract: The invention relates to a fuel cell system (100), having: at least one fuel cell (101) and a cathode path (10) for providing an oxygen-containing reactant in the form of supply air (L1) to the at least one fuel cell (101), wherein the cathode path (10) has a supply air line (11) for providing the supply air (L1) to the at least one fuel cell (101) and an exhaust air line (12) for discharging exhaust air (L2) from the at least one fuel cell (101), and at least one heat exchanger (20) is provided between the supply air line (11) and the exhaust air line (12) of the cathode path (10) in order to transfer thermal energy from the supply air (L1) to the exhaust air (L2). For this purpose, the heat exchanger (20) is designed to transfer the heat to an exhaust air (L2) flow (M3) flowing through the heat exchanger (20) by means of the evaporation and condensation of product water (H2O) and by means of multiple supply air (L1) flows (M1, M2) flowing through the heat exchanger (20).

Abstract: The present invention relates to a fuel cell system (100) for converting energy. The fuel cell system (100) comprises a fuel cell stack (101) having a plurality of fuel cells, a recirculation path (105) fluidically connected to a cathode tract (103) of the fuel cell stack (101), an air system (111) for supplying air to the fuel cell system (100), at least one actuator (107, 123), and a computing unit (109).

Abstract: A fuel cell system comprises a first fuel cell stack having a first compressor, a first supply air inlet, and a first exhaust air outlet, at least one second fuel cell stack having a second compressor, a second supply air inlet, and a second exhaust air outlet, a central supply air connector having a supply air shutoff valve, a central exhaust connector having an exhaust air shutoff valve, and a control unit, wherein the first supply air inlet and the second supply air inlet are coupled to the central supply air connector, wherein the first exhaust air outlet and the second exhaust air outlet are coupled to the central exhaust connector, wherein the control unit is coupled to the first fuel cell stack, the at least one second fuel cell stack, the supply air shutoff valve, and the exhaust air shutoff valve, and wherein the control unit is designed to control the operation of the first fuel cell stack and the at least one second fuel cell stack such that the fuel cell stacks and a portion of the fuel cell syste

Abstract: A fuel cell system comprises a first fuel cell stack pair with a first fuel cell stack and a second fuel cell stack, a first compressor arrangement, and a first turbine arrangement, wherein the first compressor arrangement can be coupled to cathode inlets of the fuel cell stack of the first fuel cell stack pair, wherein the first turbine arrangement can be coupled to cathode outlets of the fuel cell stack of the first fuel cell stack pair, wherein the first turbine arrangement comprises a shaft, a first turbine which is connected to the shaft, a second turbine which is connected to the shaft, and a generator which is connected to the shaft, wherein the first compressor arrangement comprises at least one electrically operable compressor, and wherein the generator can be coupled to the at least one electrically operable compressor.

Abstract: A device and method are disclosed for operating a fuel cell system having a fuel cell stack. Data are provided that map input variables of the fuel cell system and a position of a cell of the fuel cell stack on a voltage of the cell. A model is trained to map the input variables of the fuel cell system and the position of a cell of the fuel cell stack on a probability distribution for a prediction of a voltage of the cell. Instantaneous input variables of the fuel cell system are determined. A probability for the voltage of the cell or for a total voltage of the fuel cell stack is determined for a cell of the fuel cell stack based on the input variables using the model based on the probability distribution. A state of the fuel cell system is determined based on the probability.

Abstract: The invention relates to a media combining device (M), in particular only one media combining device, preferably a common media combining device, for multiple fuel-cell systems (101, 102, 103), having the following: a container (MB) for mixing and/or examining flows of media, the following elements being arranged on said container: a respective line connection (M1) for each exhaust air line (12) for discharging exhaust air from a corresponding fuel-cell system (101, 102, 103), a respective line connection (MQ1) for each purge and/or drain line (L1) of a corresponding purge and/or drain system (Q1) of an anode system of a corresponding fuel-cell system (101, 102, 103), a line outlet (M2), in particular only one line outlet, for discharging flows of media out of the container (MB), and at least one fuel sensor(S) for detecting the fuel content in the container (MB).

Abstract: The invention relates to a method for controlling a drying process of a fuel cell system (100), in particular during shutdown of the fuel cell system (100), preferably in preparation for a start, in particular a cold start, of the fuel cell system (100), said method comprising the following steps: initiating a drying process of the fuel cell system (100), setting at least one operating parameter (i, ii, iii) in at least one functional system (1, 2, 3, 4) of the fuel cell system (100) to a constant level, monitoring at least one outlet temperature (TCathOut, TAnodOut) from a stack (101) of the fuel cell system (100) in at least one functional system (1, 2, 3, 4) of the fuel cell system (100), evaluating the at least one outlet temperature (TCathOut, TAnodOut), determining a termination time (tdryEnd) for ending the drying operation in accordance with the evaluation.

Abstract: The invention relates to a method for calibrating a fuel sensor (S) of a fuel cell system (100), wherein the method comprises the following steps: 1) opening a bypass valve (BV) in the bypass line (13) in order to operate the bypass line (13) in the open state; 2) closing shut-off valves (SV1, SV2) in the air supply line (11) and in the exhaust air line (12) in order to conduct all supply air from the air supply line (11) past the at least one fuel cell (101) and introduce it into the exhaust air line (12), 3) carrying out a zero-point calibration of the fuel sensor (S).

Abstract: The invention relates to a fuel cell system, having at least one fuel cell with an anode, a cathode, a membrane arranged between the anode and the cathode, a cathode inlet, a cathode outlet, an anode inlet, and an anode outlet. According to the invention, the fuel cell system is characterized in that the fuel cell system is designed to at least partly conduct water accumulating on the anode outlet at least partially to at least one humidification connection in an oxidant line connected to the cathode inlet so that an oxidant flow flowing to the cathode inlet is humidified.

Abstract: A fuel-cell system is proposed, comprising at least one fuel cell, an oxidant line, a hydrogen line, an exhaust-gas line, a control unit, and at least one electrically controllable valve, which is coupled to the control unit and is connected to one from among the oxidant line, the hydrogen line, and the exhaust-gas line. The fuel-cell system is distinguished in that the control unit is designed to activate the at least one valve in a pulsating or oscillating manner, at least during a first time interval, such that the at least one valve is prevented from remaining in a stationary state and seizing up by icing during the first time interval.

Abstract: The invention relates to a method for protecting components of a fuel cell system (1), the fuel cell system (1) having a fuel cell stack (101), an air path (10), an off-gas line (12), and a fuel line (20) with a recirculation circuit (50), the method comprising the steps of: monitoring the air path (10) for a fault; closing a first valve (61) which is situated in the air path (10) and closing a second valve (62) which is situated in the off-gas line (12); blocking a purge valve (41); reducing the pressure in the air path (10) upstream of the first valve (61); if further operation of the fuel cell system (1) is possible: increasing the pressure in the air path (10) upstream of the first valve (61); unblocking the purge valve (41); opening the first valve (61) and the second valve (62); further operating the fuel cell system (1).

Abstract: The invention relates to a method for setting an operating strategy for a fuel cell system (2) of a power generation device (1), in particular in the form of a vehicle, depending on an operating mode of the power generation device (1), having the steps of: a determination unit (3) determining at least one current operating parameter (P1) of the power generation device (1), the determination unit (3) determining at least one cumulative and/or predictive operating parameter (P2, P3, P4) of the power generation device (1), and a setting device (8) setting the operating strategy for the fuel cell system (2) on the basis of the at least one current operating parameter (P1) and the at least one cumulative and/or predictive operating parameter (P2, P3, P4) of the power generation device (1). The invention furthermore relates to a corresponding circuit arrangement (10), to a computer program (20) and to a storage means with a computer program (20) stored thereon.

Abstract: The invention relates to a fuel cell system (100), having: at least one fuel cell (101) and a cathode path (10) for providing an oxygen-containing reactant in the form of supply air (L1) to the at least one fuel cell (101), wherein the cathode path (10) has a supply air line (11) for providing the supply air (L1) to the at least one fuel cell (101) and an exhaust air line (12) for discharging exhaust air (L2) from the at least one fuel cell (101), and at least one heat exchanger (20) is provided between the supply air line (11) and the exhaust air line (12) of the cathode path (10) in order to transfer thermal energy from the supply air (L1) to the exhaust air (L2). For this purpose, the heat exchanger (20) is designed to transfer the heat to an exhaust air (L2) flow (M3) flowing through the heat exchanger (20) by means of the evaporation and condensation of product water (H20) and by means of multiple supply air (L1) flows (M1, M2) flowing through the heat exchanger (20).

Abstract: A computer-implemented method for a time-controlled delivery of updatable services to on-board systems of vehicles which use the services. The method includes analyzing the detected data to identify delivery time periods for the updatable services being optimal for each vehicle which uses the services, wherein the network usage of the backend server is optimally allotted to the specified time period on the basis of the availability of the data connection of the vehicles using the services to the backend server. A system for a time-controlled delivery of updatable services to on-board systems of vehicles that use the services is also disclosed.

Abstract: The invention relates to a heat exchanger system for operating a fuel cell stack, comprising: a first compressor and a second compressor for the cathode gas fed to the fuel cell stack, the second compressor being fluidically downstream of the first compressor; a turbine, which is mechanically coupled to the second compressor and against which the cathode gas discharged from the fuel cell stack flows; a first heat exchanger, which is thermally coupled to the fed cathode gas between the first compressor and the second compressor; a second heat exchanger, which is thermally coupled to the fed cathode gas downstream of the second compressor; a fourth heat exchanger, which is thermally coupled to the discharged cathode gas downstream of the turbine; wherein the fourth heat exchanger is thermally variably coupled to the first heat exchanger and to the second heat exchanger in order to control a heat exchange for cooling the first heat exchanger and the second heat exchanger.