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Electric drive system having DC bus voltage control

  • US 7,298,102 B2
  • Filed: 10/29/2004
  • Issued: 11/20/2007
  • Est. Priority Date: 05/25/2004
  • Status: Active Grant
First Claim
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1. A controller for an electric drive system in a work machine comprising an article that includes a computer readable medium having a control algorithm recorded thereon;

  • said controller being configured via said control algorithm to compensate for a change in requested power demand on a DC bus of the electric drive system having an electric motor and a generator separate from the electric motor connected therewith, wherein said controller includes;

    means for determining a change in requested power demand on said DC bus; and

    means for compensating for the change in requested power demand via at least one of the generator and an energy storage device, including means for commanding a current change at a DC to DC converter coupling the energy storage device with said DC bus and means for commanding a power output change of said generator;

    said means for compensating further including means for compensating for the change in power demand primarily via the energy storage device rather than the generator, if a stored energy of said energy storage device is within a predetermined middle range.

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