Robert Boschgmbh

Michael Schmidt

Felix Guenther

Ingo Brauer

Helerson Kemmer

The invention relates to a method for operating a fuel cell system (), in particular a PEM fuel cell system, in which at least one fuel cell () is supplied with a hydrogen-containing anode gas via an anode gas path () and anode gas exiting the fuel cell () is returned via a recirculation path (), wherein, in order to reduce a nitrogen content in the anode gas, a flush valve () arranged in the recirculation path () is opened and the recirculation path () is flushed. According to the invention, the hydrogen content of the anode gas is determined using at least one sensor () and used as a control variable when controlling the flushing of the recirculation path (). The invention also relates to a control device () for carrying out the method according to the invention.

Method for operating a fuel cell system and control device for same

The invention relates to a method for operating a fuel cell system (), in particular a PEM fuel cell system, in which at least one fuel cell () is supplied with a hydrogen-containing anode gas via an anode gas path () and anode gas exiting the fuel cell () is returned via a recirculation path (), wherein, in order to reduce a nitrogen content in the anode gas, a flush valve () arranged in the recirculation path () is opened and the recirculation path () is flushed. According to the invention, the actual composition of the anode gas is determined using at least one sensor () and the ageing status of the at least one fuel cell () is determined by comparing the determined actual composition with a target composition and/or an actual composition determined earlier. The invention also relates to a control device () for carrying out the method according to the invention.

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Weinstadt, Germany

Michael Schmidt