Method for flushing a fuel cell system
AssigneeDaimler AG
InventorsSascha Mielke, Pere Antoni Pastor Nigorra, Sven Schmalzriedt, Muhammad Usman
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Abstract
A method for flushing a fuel cell system during a power-down cycle includes conveying air by an air conveying device through a cathode space of a fuel cell and releasing the conveyed air through an exhaust air line. An outlet valve is cyclically closed and opened during the power-down cycle, where an opening duration depends on an amount of air that is conveyed and the outlet valve connects an anode discharge line to the exhaust air line. The conveyed air is guided from a delivery side of the air conveying device directly to the exhaust air line at least in part through a system bypass.
Claims9
A method for flushing a fuel cell system during a power-down cycle, comprising the steps of:
- conveying air by an air conveying device through a cathode space of a fuel cell and releasing the conveyed air through an exhaust air line;
- cyclically closing and opening an outlet valve located in a recirculation line used to return hydrogen to an anode space during the power-down cycle, wherein an opening duration depends on an amount of air that is conveyed and wherein the outlet valve connects an anode discharge line to the exhaust air line;
- and
- guiding the conveyed air from a delivery side of the air conveying device directly to the exhaust air line at least in part through a system bypass.
Dependencies are inferred from the claim text.