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State-of-charge detection device for a battery

  • US 6,653,817 B2
  • Filed: 06/26/2001
  • Issued: 11/25/2003
  • Est. Priority Date: 06/26/2001
  • Status: Expired due to Term
First Claim
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1. A method of improving estimation of battery impedance for determining the state of charge of a battery comprising:

  • injecting an electrical signal across said battery when said battery is in discharge mode; and

    providing a powertrain controller including;

    a power inverter coupled to said battery;

    a controller controlling said power inverter, said controller monitoring the state of charge of said battery; and

    a state of charge algorithm included in said controller, wherein said step of injecting an electrical signal is performed by said controller for providing accurate criteria to said state of charge algorithm.

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