System and method for learning driveline disconnect clutch liftoff

A system, comprising:

• an internal combustion engine;
• an integrated starter/generator;
• a driveline disconnect clutch positioned in a driveline between the internal combustion engine and the integrated starter/generator;
• a transmission included in the driveline;
• and
• a controller including executable instructions stored in non-transitory memory that cause the controller to command a driveline disconnect clutch pressure in response to an estimate of a driveline disconnect clutch liftoff pressure, where the driveline disconnect clutch liftoff pressure is a pressure at which a driveline disconnect clutch drag begins to increase from a substantially constant value.

A method for operating a vehicle, comprising:

• via one or more controllers, during de-stroking of a driveline disconnect clutch, sensing a driveline disconnect clutch pressure and generating an estimated driveline disconnect clutch liftoff pressure via the driveline disconnect clutch pressure;
• adjusting a driveline disconnect clutch liftoff pressure correction in response to the estimated driveline disconnect clutch liftoff pressure;
• and
• adjusting a commanded driveline disconnect clutch pressure based on the driveline disconnect clutch liftoff pressure correction.