Auxiliary differential mechanism and work vehicle slip control system having same

A slip control system for a work vehicle having an axle mounting ground-engaging wheels or tracks and having a differential, the slip control system comprising:

• an auxiliary differential mechanism coupled to the differential and one of the ground-engaging wheels or tracks, the auxiliary differential mechanism including:
• a main shaft extending along a rotation axis and configured to couple to the differential to rotate about the rotation axis;
• a wheel shaft extending along the rotation axis and configured to rotate about the rotation axis to drive the ground-engaging wheel or track;
• a brake between the main shaft and a housing;
• a brake piston configured to selectively engage the brake to ground the main shaft;
• a clutch between the main shaft and the wheel shaft;
• a clutch piston configured to selectively engage the clutch to tie the wheel shaft to the main shaft to corotate together;
• and
• an intermediate piston between the brake and the clutch selectively movable to engage the brake or the clutch;
• and
• a controller having processing and memory architecture configured to execute control logic to control the auxiliary differential mechanism to effect different modes of operation, including:
• an anti-slip modulation mode in which either the brake is modulated and the clutch is engaged, the clutch is modulated, or both the brake and the clutch are modulated;
• and
• a partial free wheel drive mode in which the brake is engaged and the clutch is disengaged.