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Automotive battery state monitor apparatus

  • US 7,554,297 B2
  • Filed: 07/17/2007
  • Issued: 06/30/2009
  • Est. Priority Date: 06/23/2003
  • Status: Active Grant
First Claim
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1. An automotive battery state monitor apparatus comprising:

  • an automotive generator driven by an engine;

    a controlling device that controls the generator;

    an automotive battery to store electricity generated by the generator;

    means for measuring a period of time, which elapses from a completion of starting of an engine;

    means for comparing the period of time measured by the measuring means with a predetermined period of time;

    means for stopping the automotive generator temporarily during running of the engine to put polarization of the battery in a discharge condition, when the means for comparing indicates that the measured period of time reaches the predetermined period of time;

    means for increasing an output of the generator gradually after stopping the generator and after the polarization of the battery is put in the discharge condition; and

    means for picking up a battery voltage value as an open circuit voltage of the battery when a battery charge/discharge current reaches within a predetermined small range near zero.

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