Drive mechanism control in an agricultural harvester

1. An agricultural harvester comprising a header and feedrolls, wherein:

the header is adapted to be driven by a first drive mechanism applying a first load to said header to operate said header at a first rotating speed to thereby gather crop material and feed the gathered crop material to the feedrolls; and

the feedrolls are adapted to be driven by a second drive mechanism applying a second load to said feedrolls to rotate said feedrolls at a second rotating speed to thereby feed said gathered crop material to a crop processor,

a controller operationally connected to the first and the second drive mechanisms to control these drive mechanisms, the controller configured to implement a primary and a secondary synchronization procedure, wherein:

the primary synchronization procedure controls the first and second drive mechanisms such that the first rotating speed and the second rotating speed are in a first predetermined ratio range;

the secondary synchronization procedure controls the first and second drive mechanisms such that the first load and the second load approach a second predetermined ratio.

2. The agricultural harvester of claim 1 , further comprising the crop processor adapted to be driven by a third drive mechanism to actuate the crop processor at an operating speed to thereby process said crop material, wherein the controller is further operationally connected to the third drive mechanism and is configured to control the second and third drive mechanisms such that the second rotating speed and the operating speed approach a third predetermined ratio.

3. The agricultural harvester of claim 1 , wherein the controller is configured to successively execute the primary and secondary synchronization procedures.

4. The agricultural harvester of claim 1 , wherein the controller is configured to simultaneously execute the primary and secondary synchronization procedures.

5. The agricultural harvester according to claim 1 , wherein at least the first and second drive mechanisms are hydraulically powered and each comprise a pressure sensor adapted for measuring the hydraulic pressure in the respective drive mechanism, which said pressure sensor is operationally connected to the controller, so that each of said first and second loads is determinable by the controller based on an input from the respective pressure sensor.

6. The agricultural harvester according to claim 1 , wherein the controller is configured to adapt the first rotating speed of the header in the secondary synchronization procedure to approach said second predetermined ratio.

7. The agricultural harvester of claim 6 , wherein the first predetermined ratio range is defined such that the second predetermined ratio can be approached at the harvester working at a capacity of 20% to 95% of its maximum working capacity.

8. The agricultural harvester of claim 6 , wherein at least one of the first predetermined ratio range and second predetermined ratio is made dependent on at least one of the type of crop material and moisture condition of the crop material.

9. Method for controlling the operation of an agricultural harvester comprising a header and feedrolls, the method comprising:

driving the header via a first drive mechanism, thereby applying a first load to said header to operate said header at a first rotating speed to thereby gather crop material and feed the gathered crop material to the feedrolls; and

driving the feedrolls via a second drive mechanism, thereby applying a second load to said feedrolls to rotate said feedrolls at a second rotating speed in order to feed said gathered crop material to a crop processor;

wherein the harvester comprises a controller operationally connected to the first and the second drive mechanisms to control these drive mechanisms, the method further comprises synchronization steps of:

controlling the first and second drive mechanisms with the controller such that the first rotating speed and second rotating speed are in a first predetermined ratio range;

controlling the first and second drive mechanisms with the controller such that the first load and the second load approach a second predetermined ratio.

10. Method according to claim 9 , wherein the controller is further operationally connected to a third drive mechanism for driving the crop processor at an operating speed so as to process said crop material, and wherein the method further comprises: controlling the second and third drive mechanisms such that the second rotating speed and the operating speed approach a third predetermined ratio.

11. Method according to claim 9 , wherein said synchronization steps are successively executed.

12. Method according to claim 9 , wherein said synchronization steps are simultaneously executed.

13. Method according to claim 9 , wherein controlling the first and second drive mechanisms comprises adapting the first rotating speed of the first drive mechanism.

14. Method according to claim 9 , wherein speed synchronization is prioritized over load synchronization, the latter being only conducted within the boundaries of the speed synchronization.

15. Method according to claim 9 , wherein the synchronization is conducted with continuously operating the agricultural harvester.