Battery condition detecting apparatus and charge control apparatus for automobile

  • US 5,412,323 A
  • Filed: 12/10/1993
  • Issued: 05/02/1995
  • Est. Priority Date: 07/02/1990
  • Status: Expired due to Term
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First Claim
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1. A battery condition detecting apparatus comprising:

  • battery current detecting means for detecting charge/discharge currents of a battery;

    battery voltage detecting means for detecting a terminal voltage of the battery;

    battery current accumulating means for accumulating the charge/discharge currents of said battery which has been detected by said battery current detecting means;

    first battery capacity detecting means for detecting a first battery capacity based on the voltage of the battery which is detected by said battery voltage detecting means when the discharge current of said battery detected by said battery current detecting means is a predetermined value;

    second battery capacity detecting means for detecting a second battery capacity by adding the charge/discharge currents accumulated by said battery current accumulating means after the detection of the first battery capacity to an initial capacity setting mans so as to be detected as a second battery capacity,initial capacity setting means for comparing the first battery capacity with a previously detected second battery capacity, for setting as the initial capacity of the battery the smaller of the first battery capacity and the previously detected second battery capacity, and for setting the first battery capacity as the initial battery capacity when the previously detected second battery capacity fails to exist.

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