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STATE OF CHARGE CONTROL METHOD AND SYSTEMS FOR VEHICLES

  • US 20090015202A1
  • Filed: 07/10/2007
  • Published: 01/15/2009
  • Est. Priority Date: 07/10/2007
  • Status: Active Grant
First Claim
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1. A method for controlling a state of charge in a hybrid electric vehicle battery, comprising:

  • sensing a battery state of charge in a hybrid electric vehicle battery, the battery being operable to provide energy to propel a vehicle;

    accessing an upper state of charge limit;

    accessing a lower state of charge limit, the upper and lower limit defining a state of charge range;

    storing a target state of charge value which has been set at less than the midpoint of the state of charge range, wherein the target state of charge value is kept at that level regardless of predicted vehicle driving conditions; and

    regulating the battery state of charge based upon the target state of charge value and the upper and lower limits.

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