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System and method for monitoring a state of charge of a battery

  • US 10,173,613 B2
  • Filed: 08/18/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 08/18/2015
  • Status: Active Grant
First Claim
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1. A method for monitoring a state of charge of a battery of a vehicle comprising:

  • monitoring an operating voltage of the battery with a battery monitor;

    calculating a voltage drop between the operating voltage and a loaded voltage with the battery monitor when the battery is under load from an electric power steering system;

    comparing the voltage drop to a predetermined voltage drop;

    determining that the state of charge of the battery is low when the voltage drop is greater than or equal to the predetermined voltage drop; and

    operating the electric power steering system in a limited state, wherein when the state of charge of the battery is low the current draw of the electric power steering system is limited to a current draw less than a peak current draw requirement when the voltage drop is less than the predetermined voltage drop.

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