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Method and apparatus for automotive battery condition indication

  • US 6,275,161 B1
  • Filed: 09/17/1999
  • Issued: 08/14/2001
  • Est. Priority Date: 09/18/1998
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring and indicating a condition of an automotive battery, said method comprising the steps of:

  • (i) extracting a ripple voltage component from a battery voltage present in an automotive battery supply line during engine running, said battery voltage constituted of a DC voltage component and said ripple voltage component;

    (ii) generating a ripple voltage characteristic comparison reference based on said ripple voltage component; and

    (iii) comparing said ripple voltage characteristic comparison reference with said ripple voltage component to determine the condition of said automotive battery [2].

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