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Energy storage module for load leveling in lift truck or other electrical vehicle

  • US 8,203,310 B2
  • Filed: 10/20/2008
  • Issued: 06/19/2012
  • Est. Priority Date: 10/20/2008
  • Status: Active Grant
First Claim
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1. A method for maintaining a level of charge between a battery and a load in an electrical vehicle, the method comprising the following steps:

  • connecting a bank of super capacitors between an electrical load and the battery supplying power to the load;

    isolating the super capacitors from the battery, while the battery remains in the circuit and is capable of providing power to the load;

    measuring a battery voltage at the battery;

    measuring a capacitor voltage indicating the voltage on the bank of super capacitors;

    calculating a voltage difference between the battery voltage and the capacitor voltage; and

    charging the super capacitors when the voltage difference is greater than a predetermined minimum voltage, wherein the charged super capacitors reduce the rate of discharge from the battery to the electrical load.

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