Self-propelled forage harvester with automatic chopping system

A self-propelled forage harvester comprising:

• a feed device;
• a chopping device comprising a cutterhead with cutting blades and a shear bar for comminuting harvested material;
• a drive;
• a driver assistance system comprising a memory for saving data including storing a plurality of selectable harvesting process strategies and a processor for processing the saved data, the driver assistance system configured to control at least the chopping device, and
• wherein the chopping device in combination with the driver assistance system form an automatic chopping system in that the processor is configured to continuously determine a compaction of the comminuted harvested material, and based on at least one of the stored plurality of selectable harvesting process strategies, to autonomously ascertain at least one operating parameter that influences cutting length and to control, based on the ascertained at least one operating parameter, a respective working unit thereby adapting the cutting length in order to maintain a predetermined compactability.