Harvester head reel segments synchronization

A harvester head comprising:

• a frame;
• a position adjustable reel having a first segment and a second segment movably supported by the frame;
• a hydraulic supply comprising a pump and a reservoir;
• a first plurality of hydraulic cylinders coupled to the first segment to reposition the first segment, the first plurality of hydraulic cylinders comprising:
• a first hydraulic cylinder comprising a first barrel housing a first displaceable piston separating an interior of the first barrel into a rod side and a cap side, the first displaceable piston having a first rod connected to a first portion of a respective one of the first segment and the second segment;
• a second hydraulic cylinder comprising a second barrel housing a second displaceable piston separating an interior of the second barrel into a rod side and a cap side, the second displaceable piston having a second rod connected to a second portion of the first segment;
• a first hydraulic fluid line connecting the hydraulic supply to the rod side of the first hydraulic cylinder;
• a second hydraulic fluid line connecting the cap side of the first hydraulic cylinder to the rod side of the second hydraulic cylinder;
• a first selectively actuatable rephasing valve fluidly coupling the rod side of the first hydraulic cylinder to the rod side of the second hydraulic cylinder;
• and
• a second selectively actuatable rephasing valve fluidly coupling the cap side of the second hydraulic cylinder to the hydraulic supply;
• a second plurality of hydraulic cylinders coupled to the second segment to reposition the second segment, the second plurality of hydraulic cylinders comprising:
• a third hydraulic cylinder comprising a third barrel housing a third displaceable piston separating an interior of the third barrel into a rod side and a cap side, the third displaceable piston having a third rod connected to a first portion of the second segment;
• a fourth hydraulic cylinder comprising a fourth barrel housing a fourth displaceable piston separating an interior of the fourth barrel into a rod side and a cap side, the fourth displaceable piston having a fourth rod connected to a second portion the second segment;
• a third hydraulic fluid line connecting the hydraulic supply to the rod side of the third hydraulic cylinder;
• a fourth hydraulic fluid line connecting the cap side of the third hydraulic cylinder to the rod side of the fourth hydraulic cylinder;
• a third selectively actuatable rephasing valve fluidly coupling the rod side of the third hydraulic cylinder to the rod side of the fourth hydraulic cylinder;
• a fourth selectively actuatable rephasing valve fluidly coupling the cap side of the fourth hydraulic cylinder to the hydraulic supply;
• a first bidirectional valve operably coupled between the hydraulic supply and the first plurality of hydraulic cylinders;
• a second bidirectional valve operably coupled between the hydraulic supply in the second plurality of hydraulic cylinders;
• a first sensor to sense a stroke position of one of the first hydraulic cylinder and the second hydraulic cylinder;
• a second sensor to sense a stroke position of one of the third hydraulic cylinder and the fourth hydraulic cylinder;
• and
• a controller to (1) selectively actuate the first rephasing valve and the second rephasing valve based upon signals from the first sensor;
• (2) selectively actuate the third rephasing valve and the fourth rephasing valve based upon signals from the second sensor;
• and (3) to selectively actuate the first bidirectional valve and the second bidirectional valve based upon a comparison of signals from the first sensor and the second sensor to synchronize positioning of the first segment and the second segment.