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Apparatus for estimating fuel-cell hydrogen concentration and fuel cell system

  • US 8,542,026 B2
  • Filed: 05/08/2009
  • Issued: 09/24/2013
  • Est. Priority Date: 05/08/2009
  • Status: Expired due to Fees
First Claim
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1. A hydrogen concentration estimating apparatus for a fuel cell that includes an anode and a cathode and generates electric power by the anode receiving hydrogen and the cathode receiving oxygen, the apparatus comprising:

  • measuring means for measuring impedance or admittance of the fuel cell; and

    estimating means for estimating a hydrogen concentration inside the fuel cell based on a measured value measured by the measuring means such that the hydrogen concentration is estimated to be relatively low when an impedance semicircle of the fuel cell is relatively large.

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