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State of charge algorithm for lead-acid battery in a hybrid electric vehicle

  • US 6,646,419 B1
  • Filed: 05/15/2002
  • Issued: 11/11/2003
  • Est. Priority Date: 05/15/2002
  • Status: Expired due to Term
First Claim
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1. A method of determining the state of charge of a battery comprising:

  • integrating the charge going in and out of the battery to determine a current based state of charge measurement;

    compensating the current based state of charge measurement using a Peukert factor; and

    measuring the open circuit voltage to determine a voltage based state of charge measurement; and

    compensating the current based state of charge measurement based on the voltage based state of charge measurement.

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