METHODS AND SYSTEMS FOR STARTING AN ENGINE

摘要

Methods and systems are provided for improving engine restart operations in a hybrid vehicle. While an engine is cranked via motor torque, engine fueling is delayed until the engine speed is sufficiently high and the engine has been rotating in a forward direction continuously for a threshold duration. A disconnect clutch between the engine and motor is slipped while the engine cranks, the clutch engaged only after the engine has run up to the motor speed.

主权项

1. A method for a hybrid vehicle, comprising:
during an engine restart,
cranking an engine via a motor with a disconnect clutch between the engine and the motor at least partially disengaged while delaying fueling of the engine until only after an engine speed is above a threshold speed and a direction of engine rotation is positive for greater than a threshold duration.