Patent ID: 8296020

Claim:
A method to control torque applied through a powertrain to a driveline, the powertrain comprising a plurality of torque generative devices and a transmission comprising an output shaft, a plurality of planetary gear sets connecting the torque generative devices to the output shaft, a first and second selectable one-way clutches connected to a first of the planetary gear sets, a control module configured to execute the method comprising: monitoring a desired transmission setting selection comprising one of a low range continuously variable gear mode, a high range continuously variable gear mode, and a fixed gear mode, the low range continuously variable gear mode comprising one of the low range continuously variable gear mode operating in a forward configuration with the driveline operating in a forward direction and the low range continuously variable gear mode operating in a reverse configuration with the driveline operating in a reverse direction; determining a desired state for the first and second selectable one-way clutches based upon the desired transmission setting selection; and actuating the first and second selectable one-way clutches to effect the desired state for the first and second selectable one-way clutches comprising, when the desired transmission setting selection is the low range continuously variable gear mode operating in the reverse configuration with the driveline operating in the reverse direction, selectively locking only the first selectable one-way clutch in a reverse direction of rotation to ground a gear of the first of the planetary gear sets and freewheeling only the second selectable one-way clutch in a reverse direction of rotation.