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Safety device to prevent excessive battery drain

  • US 4,902,956 A
  • Filed: 11/17/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 12/12/1986
  • Status: Expired due to Fees
First Claim
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1. For use in conjunction with a vehicle having a battery, an ignition system, and at least one electrically powered accessory connected to the battery, a device for electrically disconnecting the battery from the accessory whenever the battery energy falls below a predetermined value comprising:

  • a normally closed switch connected in series between the battery and the accessory, andmeans for opening said switch comprising;

    means for sensing a battery characteristic indicative of battery drain and for generating an output signal whenever an energy capacity of said battery falls below said predetermined value,timing means responsive to said sensing means output signal for generating a timing output signal a predetermined time period after said sensing means output signal, andmeans responsive to said timing means output signal for opening said switch,wherein said sensing means comprises means for determining the rate of discharge of the battery and for adjusting a threshold level at which said timing means is activated as a function of the rate of discharge of the battery.

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