Method and means for adjusting battery monitor based on rate of current drawn from the battery

  • US 5,451,881 A
  • Filed: 04/07/1994
  • Issued: 09/19/1995
  • Est. Priority Date: 12/10/1993
  • Status: Expired due to Term
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First Claim
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1. A metering system for measuring and indicating the state of charge of an electrical storage battery, comprising:

  • (a) means for storing a numerical value indicative of the state of charge of said battery and for providing an output voltage signal representative thereof;

    (b) means for detecting the terminal voltage of said battery, coupled to said means for storing, and being operable to generate a function of said battery terminal voltage which is a substantially proportional fraction of said terminal voltage and to provide an input to said means for storing if said function is below a threshold variable reference voltage signal;

    (c) means for receiving said output voltage signal and for generating said variable reference voltage signal therefrom, said variable reference voltage signal being lowered as a function of said output voltage signal when said output voltage signal indicates progressively lower states of charge; and

    (d) means for measuring the rate of current drawn from said battery and adjusting said means for receiving and generating, in proportion to said rate, such that said variable reference voltage signal will be greater or lesser depending on the instantaneous level of said rate.

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