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Method and apparatus for monitoring the condition of charge of a battery connected to an appliance and including counters counted with respect to the time and drain of the battery

  • US 4,977,393 A
  • Filed: 06/08/1989
  • Issued: 12/11/1990
  • Est. Priority Date: 07/07/1988
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring the condition of charge of a battery for an appliance, said battery providing power to a plurality of electrical consumption means of the appliance, comprising the steps of:

  • setting a first counter to an initial count condition which is representative of a fully charged condition of the battery;

    scanning at periodic intervals the plurality of electrical consumption means to determine if power is being supplied to each of the electrical consumption means;

    changing the count condition of the first counter towards a final count condition in dependence upon the time each electrical consumption means is provided with electrical power and also in dependence upon the power consumption of each electrical consumption means;

    generating a signal upon reaching said final count condition of the first counter;

    activating a second counter upon reaching said final count condition of the first counter;

    changing the count condition of the second counter from an initial count condition towards a final count condition in dependence upon the time each electrical consumption means is provided with electrical power and also in dependence upon the power consumption of each electrical consumption means; and

    switching off the appliance powered by said battery upon said second counter reaching its final count condition.

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