Fuel cell stack shutdown operation controlling anode pressure using discharge fuel consumption estimate

摘要

A method including shutting down an electrochemical fuel cell stack wherein anode pressure is controlled according to a stack discharge fuel consumption estimate.

主权项

1. A method comprising:
shutting down an electrochemical fuel cell stack comprising:
disconnecting the stack from a load;reducing flow of oxidant to a cathode portion of the stack;discharging the stack through discharge circuitry;continuing flow of fuel to an anode portion of the stack for consumption of residual oxidant;controlling anode pressure according to a stack discharge fuel consumption estimate; andgenerating a feedforward control signal using the stack discharge fuel consumption estimate, to reduce anode pressure control error during stack shutdown.