Methods and systems for a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, Mark Steven Yamazaki, Jeffrey Allen Doering, Dennis Craig Reed, Adam Nathan Banker
Life of this patent
Estimating the term…
Abstract
Systems and methods for learning torque estimate errors and updating torque estimation models are presented. In one example, torque errors are learned during an engine shut-down, after a disconnect clutch coupled between an engine and an electric machine has been released. An updated torque estimation model is then used to control torque during subsequent engine operation to improve drive feel and vehicle performance.
Claims20
A method for a hybrid vehicle, comprising:
- during selected engine shut-down conditions,
- releasing a disconnect clutch coupled between an engine and an electric machine in a vehicle driveline;
- and
- after disconnect clutch release, estimating torque errors based on deviations of an actual engine speed profile from a commanded engine speed profile at each of a plurality of engine speed set-points.
A method for a hybrid vehicle driveline, comprising:
- in response to idle-stop conditions,
- selectively deactivating an engine and releasing a disconnect clutch coupled between the engine and a CISG;
- the CISG coupled to driveline transmission and wheels;
- and
- while the engine is decelerating,
- maintaining an engine torque command;
- and
- learning an engine torque error within an engine speed window, the error estimated based on deviation of an actual engine speed profile from an expected engine speed profile in the engine speed window, upon release of the clutch.
A hybrid vehicle method, comprising:
- attempting to provide zero torque across a disconnect clutch upon clutch release, the clutch mechanically coupling an engine to an electric machine;
- and
- while an engine is decelerating with the clutch released, learning errors in air and fueling required to provide the zero torque based on an engine speed profile in a window at each of a plurality of engine speed set-points.
Dependencies are inferred from the claim text.