Method for determining the amount of charge which can be drawn on a storage battery, and monitoring device for a storage battery

  • US 20040189255A1
  • Filed: 08/26/2003
  • Published: 09/30/2004
  • Est. Priority Date: 08/31/2002
  • Status: Active Grant
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First Claim
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1. A method for determining the amount of charge which can be drawn from a storage battery comprising:

  • determining a battery voltage profile and a battery current profile over at least one time interval;

    smoothing the battery voltage profile and the battery current profile using at least two different smoothing measures;

    determining voltage differences between the battery voltage profile smoothed using a second smoothing measure and the battery voltage profile smoothed using a third smoothing measure, with the third smoothing measure producing greater smoothing than the second smoothing measure;

    determining current differences between the battery current profile smoothed using a second smoothing measure and the battery current profile smoothed using a third smoothing measure, with the third smoothing measure producing greater smoothing than the second smoothing measure;

    calculating characteristic values from quotients of the voltage differences and the current differences;

    utilizing the characteristic values for a time interval to determine an interval characteristic value; and

    determining of the amount of charge which can be drawn from the storage battery from at least one interval characteristic value for at least one time interval.

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