| 摘要 |
A forage harvester includes feed rolls operable to convey crop to a cro p cutter drum. The forage harvester is provided with a control arranged to produce a controller output signal based upon a sensed number of rotations of the crop cutter drum or the feed rolls. The controller output signal operates such that a difference between an actual relation between the feed roll and cutter drum speeds and a nominal relation is at least reduced. The control is operable to produce the controller output signal independent from a detection of the speed of the feed rolls or the chopper drum. The speed of the feed rolls or chopper drum is hence controlle d without feedback, but with an open loop. Thus, a sensor is saved and control oscillations are avoided.
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