The present invention relates to methods of torque transfer, torque
transfer units, and vehicles incorporating the same. According to the
method, a delta signal indicative of a rotational condition of the first
driveline is generated and a torque transfer unit is controlled as a
function of a torque transfer control algorithm. The control algorithm
commands a transfer torque representing an amount of torque to transfer
from the source of power to one of the first and second drivelines. The
torque transfer control algorithm is a function of the delta signal and is
substantially independent of any rotational condition of the second
driveline over a primary operational range of the algorithm. Reference
values may comprise a desired vehicle acceleration value, an actual
vehicle acceleration value, a vehicle ground speed value, temporally
displaced first driveline acceleration values, temporally displaced first
driveline speed values, and combinations thereof.
