System and method for learning driveline disconnect clutch liftoff
AssigneeFord Global Technologies, LLC
InventorsAkshay Bichkar, Corey James Blue, Samuel Melville Glauber, Joseph Kucharski, Bradley Dean Riedle
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating a driveline disconnect clutch of a hybrid vehicle are presented. In one example, a driveline disconnect clutch liftoff pressure is estimated according to a derivative of a driveline disconnect clutch pressure when a driveline disconnect clutch is being de-stroked. The driveline disconnect clutch may be prepositioned in anticipation of driveline disconnect closing based on the estimated driveline disconnect clutch liftoff pressure.
Claims14
A method for operating a vehicle, comprising:
- via one or more controllers, during de-stroking of a driveline disconnect clutch, monitoring a driveline disconnect clutch pressure and generating an estimated driveline disconnect clutch liftoff pressure via the driveline disconnect clutch pressure;
- adjusting a commanded driveline disconnect clutch pressure based on the estimated driveline disconnect clutch liftoff pressure;
- generating a derivative of the driveline disconnect clutch pressure;
- and
- generating the estimated driveline disconnect clutch liftoff pressure according to the driveline disconnect clutch pressure after the derivative of the driveline disconnect clutch is less than a threshold value for longer than a threshold time duration.
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, additional executable instructions that cause the controller to generate a derivative of the driveline disconnect clutch pressure, and additional executable instructions that cause the controller to generate the estimate of the driveline disconnect clutch liftoff pressure in response to the derivative exceeding a threshold 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, where the estimated driveline disconnect clutch liftoff pressure is based on a derivative of the driveline disconnect clutch pressure where the derivative exceeds a threshold value;
- and
- adjusting a commanded driveline disconnect clutch pressure based on the driveline disconnect clutch liftoff pressure correction.
Dependencies are inferred from the claim text.