Predictive-based control for transmission shifting

A powertrain comprising:

• a transmission having an input shaft, an output shaft, and a plurality of clutches engageable in various combinations to establish power flow paths between the input and output shafts;
• and a controller programmed to, responsive to a shift of the transmission:
• reduce torque capacity of an off-going one of the clutches and increase torque capacity of an oncoming one of the clutches during a torque transfer phase of the shift, and in response to an inertia phase of the shift, command non-zero torque capacity to the off-going clutch such that the off-going clutch brakes the output shaft throughout an entire duration of the inertia phase, wherein the command of the non-zero torque capacity further includes increasing and decreasing the non-zero torque capacity during the inertia phase based on a slip of the oft-going clutch.

A method of shifting a transmission having an input shaft, an output shaft, and a plurality of clutches engageable in various combinations to establish power flow paths between the input and output shafts, the method comprising:

• via a vehicle controller:
• reducing torque capacity of an off-going one of the clutches and increase torque capacity of an oncoming one of the clutches during a torque transfer phase of the shift;
• and in response to an inertia phase of the shift, command non-zero torque capacity to the off-going clutch such that the off-going clutch brakes the output shaft throughout an entire duration of the inertia phase, wherein the command of the non-zero torque capacity further includes increasing and decreasing the non-zero torque capacity during the inertia phase based on a slip of the off-going clutch.