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Method and system for use with a vehicle electric storage system

  • US 7,791,216 B2
  • Filed: 11/01/2004
  • Issued: 09/07/2010
  • Est. Priority Date: 11/01/2004
  • Status: Active Grant
First Claim
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1. A method for controlling operation of a vehicle having an electric powertrain and an electric energy storage system (ESS) in communication with the electric powertrain, the ESS including a capacitor, a battery, and a DC/DC converter, the method comprising:

  • monitoring a state of charge (SOC) of the capacitor;

    controlling the DC/DC converter to allow only the capacitor to discharge to the electric powertrain when the capacitor SOC is greater than or equal to a first threshold;

    controlling the DC/DC converter to allow both the capacitor and battery to discharge to the electric powertrain when the capacitor SOC is less than the first threshold; and

    controlling the DC/DC converter to allow only the battery to discharge to the electric powertrain when the capacitor SOC is less than a second threshold.

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