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Over-voltage and under-voltage management for electric drive system

  • US 7,795,825 B2
  • Filed: 09/15/2008
  • Issued: 09/14/2010
  • Est. Priority Date: 09/15/2008
  • Status: Active Grant
First Claim
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1. A method of voltage supply management for an electric drive system, the electric drive system including a fuel-driven engine having an output for driving an electrical power generator, the electrical power generator providing power to one or more electric drive motors via a supply link, the method comprising:

  • receiving a voltage signal indicative of a voltage in the supply link;

    receiving one or more condition signals indicative of an operating condition of the electric drive system;

    calculating a desired voltage value based on the voltage signal and the one or more condition signals;

    differencing the desired voltage value and the voltage signal to yield a voltage error signal indicating an extent to which the voltage signal diverges from the desired voltage value; and

    determining whether the voltage error signal is indicative of an over-voltage condition or of an under-voltage condition and dissipating power from the supply link if the voltage error signal is indicative of the over-voltage condition, and imposing a torque command limit with respect to the one or more electric drive motors if the voltage error signal is indicative of the under-voltage condition.

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