System and method for monitoring a vehicle battery

  • US 6,424,157 B1
  • Filed: 07/20/1999
  • Issued: 07/23/2002
  • Est. Priority Date: 07/20/1998
  • Status: Expired due to Term
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First Claim
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1. A system for monitoring the condition of a battery installed in a vehicle having an engine, said system comprising:

  • a voltage sensor for determining the voltage of the battery at the time of starting of the vehicle engine;

    a current sensor for determining the current drain of the battery at said time of starting of the engine; and

    computer means for computing the rate of change of the battery dynamic internal resistance (IR) and the rate of change of the battery dynamic polarization resistance (PR) based on determinations of voltage and current by said voltage sensor and said current sensor at different times of vehicle engine start, said computer means further including means responsive to an increasing dynamic IR and an increasing dynamic PR for producing an indication of low electrolyte in the battery.

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