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Fuel cell system

  • US 8,658,322 B2
  • Filed: 02/22/2006
  • Issued: 02/25/2014
  • Est. Priority Date: 03/09/2005
  • Status: Active Grant
First Claim
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1. A fuel cell system, comprising:

  • a fuel cell that has a solid polymer electrolyte membrane;

    a measurement module configured to measure values of an alternating current impedance of the fuel cell in time series while the fuel cell system is in operation;

    a computation module configured to compute a variance from the measured values of the alternating current impedance; and

    a detection module configured to detect a wet state of the electrolyte membrane, based on the variance.

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