Battery monitor and method for providing operating parameters

  • US 5,321,627 A
  • Filed: 03/11/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 03/11/1992
  • Status: Expired due to Term
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First Claim
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1. A battery monitor for monitoring operating parameters of a battery, said battery monitor comprising:

  • voltage sensor means for sensing batter voltage and providing a voltage sensor signal indicative of said battery voltage;

    current sensor means for sensing battery current and providing a current sensor signal indicative of said battery current;

    processing means coupled to said voltage sensor means and said current sensor means for reading said voltage sensor signal, for reading said current sensor signal, and for computing said operating parameters at spaced apart computing times;

    memory means coupled to said processing means for storing selected ones of the last computed said operating parameters;

    said processing means determining when said battery is in discharge and computing, responsive to said voltage sensor signal and said current sensor signal, a corrected battery voltage and, from said corrected battery voltage, computing relative state of charge of said battery, said processing means computing a factor representing the difference between absolute state of charge of said battery and sad relative state of charge of said battery, said processing means computing said absolute state of charge of said battery from a sum of said relative state of charge of said battery and said factor; and

    output means coupled to said processing means for providing output signals indicative of predetermined ones of said operating parameters.

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