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Energy storage system for a motor vehicle

  • US 20070170896A1
  • Filed: 01/19/2007
  • Published: 07/26/2007
  • Est. Priority Date: 01/21/2006
  • Status: Active Grant
First Claim
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1. An energy storage system for a motor vehicle, comprising:

  • an electric machine configured for operation at least as a generator, for generating a generator current;

    a vehicle electrical system battery connected in parallel to the electric machine;

    a capacitor unit connected in parallel to the electric machine; and

    a controller configured such that the battery is charged with a maximum battery charging current, if the vehicle is in a boost or braking operating mode, and in all other operating modes, the battery is charged by a battery charging current that is adjusted as a function of a state of charge of the battery, whereinthe controller is configured to adjust discharging of the battery such that a pre-defined minimum battery charging current flows through the battery, if the state of charge of the battery exceeds a pre-defined first charge threshold value;

    the controller is configured to adjust charging of the battery such that a pre-defined maximum battery charging current flows through the battery, if the state of charge of the battery falls below a pre-defined second charge threshold value; and

    the controller is configured to regulate the generator current such that a predetermined minimum charging current flows through the battery, if the state of charge of the battery is equivalent to a predetermined state of charge.

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