I've learned from this thread. This last round led me to look up Ackerman Steering. Reason is I visualized the rear wheels carving a larger arc and thus turning faster than the front wheels through a turn, and learned the opposite to be true. Don't laugh. Sometimes it's hard living in my head.
So going back to Jeep's comment reported in post #67 of this thread:
"The 2014 Jeep Cherokee utilizes its active 4WD clutch
to influence the amount of torque reacted by the rear axle
, as the actual amount is a function of the clutch
, the friction at the tires
and the center of the vehicle's mass
"When in Sport Mode, the power is variably split between the front and rear wheels with a rear wheel biased 40/60 split."
Focusing on the case of the KL in Sport Mode and moving through a curve.
- First, because it's in Sport Mode, the dance has been completed where the RDM/TTD spun up the drive shaft to rear wheel speed and the PTU locked the drive shaft to the transmission's output.
- Assuming the KL is driven in a straight line and there is good traction at all four wheels, the TTD's clutch has probably been opened so the KL is in FWD but turning the drive shaft.
- As the KL enters a turn at speed, the traction system's yaw sensor measures the movement of the vehicle's center of mass to the outside of the turn.
- A signal is sent to the TTD's controller telling it to pulse the clutch at a certain rate depending on the measure of yaw. The greater the yaw, the faster the rate of TTD pulsing up to and including a lock state.
- Since the front wheels are turning slightly faster than the rear wheels, the TTD's pulsing creates a twisting force through the rear differential thus applying more torque to the rear wheels.
That's my guess for the day.