Methods and systems for a hybrid vehicle

摘要

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.

主权项

1. 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 and before fuel injection to the engine is deactivated, estimating torque errors based on actual engine speed profile deviations from a commanded engine speed profile at each of plural engine speed set-points; and adjusting engine operation based on the estimated torque errors.