Volkswagen Ag

Audi Ag

Marc Düvel

Hendrik Schröder

Alexander Weß

Alexander Wess

Özgür Aktas

The disclosure relates to a fuel cell system comprising a fuel cell stack for providing an electrical power Pdepending on a power demand, at least one auxiliary unit for operating the fuel cell stack with an electrical power consumption P, at least one consumer with an electrical power request P, and a control unit for regulating the power demand as well as a method for controlling such a fuel cell system. It is provided that the control unit is configured to selectively operate the fuel cell system in a first operating mode or in a second operating mode, whereby the fuel cell stack is turned off depending on the operating mode upon the falling below of an optimal efficiency degree operating point P(&#x3b7;) of the fuel cell system or a minimum operating point Pof the fuel cell stack. In particular, at least one auxiliary unit is also turned off in the first operating mode, when the optimal efficiency degree operating point decreases.

Fuel cell system and method for operating a fuel cell system

A vehicle-electrical-system assembly and a method for operating a vehicle electrical system of an electrically drivable transportation unit. The method includes determining a present electrical power consumption of a component having dynamic power-consumption behavior at a first time, providing a base value by smoothing the power-consumption behavior over time, defining a power reserve for the component by adding a static power offset to the base value, and limiting a vehicle-electrical-system power available for a traction machine of the transportation unit to provide the defined power reserve for the component.

Vehicle-electrical-system assembly and method for operating a vehicle electrical system of an electrically drivable means of transportation having a fuel cell

Growing community of inventors

Cremlingen, Germany

Marc Düvel