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Control strategy to prevent humidity cycling in a fuel cell

  • US 7,829,228 B2
  • Filed: 08/24/2006
  • Issued: 11/09/2010
  • Est. Priority Date: 08/24/2006
  • Status: Expired due to Fees
First Claim
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1. A fuel cell system comprising:

  • a fuel cell stack;

    a power source; and

    a controller, responsive to a power request signal, said controller including a damping filter that damps the power request signal over a damping time during a low power transient and provides a damped power demand signal to the fuel cell stack that provides more power than the power request signal during the damping time; and

    wherein the controller is further responsive to a power source state of charge signal, said controller including a state of charge weighting factor look-up table that provides a state of charge multiplier factor depending on the power source state of charge, said controller multiplying the weighting factor by the damped power demand signal to increase or decrease the damped power demand signal depending on the state of charge of the power source, wherein excess power generated by the fuel cell stack above the power request signal is used to charge the power source.

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