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Battery remaining capacity measuring device

  • US 5,798,934 A
  • Filed: 10/28/1996
  • Issued: 08/25/1998
  • Est. Priority Date: 10/30/1995
  • Status: Expired due to Fees
First Claim
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1. A battery remaining capacity measuring device, comprising:

  • storing means for storing therein the approximating line data;

    current/voltage detecting means for detecting current flowing through a load and terminals voltage of a battery;

    correlation determining means for calculating a correlation coefficient between a plurality of current values and a plurality of voltage values detected by said current/voltage detecting means at every predetermined time, and for determining whether or not said correlation coefficient is equal to or less than a predetermined value;

    data acquisition range determining means for determining a data acquisition range adjacent to a previous approximating line stored in said storing means when said correlation coefficient is determined as equal to or less than said predetermined value, and for deleting data which are not included in said data acquisition range from the plurality of the voltage values and the plurality of the current values detected by said current/voltage detecting means;

    approximating line calculating means for calculating a approximating line based on a plurality of voltage values and a plurality of current values determined by said data acquisition range determining means, and for storing the approximating line in said storing means; and

    remaining capacity calculating means for calculating a remaining capacity of said battery based on the plurality of the voltages values and the plurality of the current values determined by said data acquisition range determining means.

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