Life diagnosis apparatus for automotive battery

  • US 4,888,716 A
  • Filed: 04/13/1987
  • Issued: 12/19/1989
  • Est. Priority Date: 04/14/1986
  • Status: Expired due to Fees
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First Claim
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1. In an automobile charge system comprising an alternator driven by an internal combustion engine and a battery charged by the alternator;

  • an automotive battery life diagnosis apparatus comprising means for detecting the terminal voltage of the battery, means for detecting the charge-discharge current of the battery, means for detecting the temperature signal correlated with the battery, and a controller for processing as predetermined the detection inputs from the detection means;

    wherein said controller is mounted on an automobile and includes;

    first means for obtaining an initial internal resistance (RBP) of a battery based on a battery voltage and a charge-discharge current before and after a first cranking under the fully charged condition of the battery, and fixedly memorizing at least the initial internal resistance (RBP);

    second means for obtaining a second internal resistance (RBP'"'"') while using the battery based on a battery voltage and a charge-discharge current before and after cranking and temporarily memorizing the second internal resistance (RBP'"'"');

    third means for obtaining a resistance ratio of the initial internal resistance (RBP) and the second internal resistance (RBP'"'"') and means for comparing the resistance ratio with a battery life ratio which indicates the life state of a predetermined battery to judge the life state of the battery under test; and

    means for displaying the result on the basis of the output of the function of judging the life state of the battery.

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