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Battery Monitor

  • US 5,130,659 A
  • Filed: 12/03/1990
  • Issued: 07/14/1992
  • Est. Priority Date: 08/21/1990
  • Status: Expired due to Fees
First Claim
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1. For use in conjunction with a battery electrically connected with a starter circuit for an internal combustion engine, a battery monitor comprising:

  • means for sensing an electrical characteristic of the battery,means responsive to said sensing means for determining the rate of discharge of the battery and for projecting future values of said electrical characteristic as a function of time,means for establishing a predetermined lower threshold value of said characteristic, said threshold value varying as a function of time, said lower threshold value indicative of the energy capacity of the battery necessary to start the engine through the starter circuit,means for determining the projected time at which said projected future value of said electrical characteristic equals said threshold value and for determining a remaining time duration between a present time and said projected time, andmeans for displaying said remaining time duration.

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