System and method for driveline disconnect clutch de-stroking and prepositioning
AssigneeFord Global Technologies, LLC
InventorsAkshay Bichkar, Corey James Blue, Jason Meyer, Maruthi Ravichandran, 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 is de-stroked in a particular way so that the driveline disconnect clutch may be de-stroked more consistently. The de-stroking process may be followed by boosting and stroking the driveline disconnect clutch so as to preposition the driveline disconnect clutch or holding the clutch at an offset below stroke pressure to minimize drag.
Claims20
A method for operating a vehicle, comprising:
- via one or more controllers, commanding an increase in a driveline disconnect clutch pressure in response to a driveline disconnect clutch de-stroke signature, where the driveline disconnect clutch de-stroke signature is a pressure that is less than an offset pressure from an expected stroke pressure of a driveline disconnect clutch for a threshold amount of time.
A system, comprising:
- an internal combustion engine;
- an integrated starter/generator;
- a 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 an increase in a driveline disconnect clutch pressure in response to a driveline disconnect clutch de-stroke signature, where the driveline disconnect clutch de-stroke signature is a pressure that is less than an offset pressure from an expected stroke pressure of a driveline disconnect clutch for a threshold amount of time, and where the driveline disconnect clutch de-stroke signature begins at a most recent time when the driveline disconnect clutch pressure drops below the offset pressure from the expected stroke pressure.
A method for operating a vehicle, comprising:
- via one or more controllers, shutting down an internal combustion engine in response to a most recent time a driveline disconnect clutch pressure drops below an offset pressure from an expected stroke pressure for a threshold amount of time.
Dependencies are inferred from the claim text.