Patent ID: 7298102

Claim:
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.