Smoothing hybrid vehicle engine shutdown

摘要

A method of smoothing hybrid vehicle engine shutdown. A powered and rotating electric machine is used to slow deceleration of an unpowered and rotating engine by transferring torque through a clutch from the machine to the unpowered engine. Prior to the machine being powered, torque may be transferred through the clutch from the unpowered and rotating engine to the unpowered machine to accelerate passage of the engine through a resonance frequency.

主权项

1. A method of smoothing hybrid vehicle engine shutdown comprising:
powering an engine and rotating an electric machine while a clutch between the engine and machine is disengaged; unpowering the engine while the machine remains rotating with the clutch disengaged; controlling deceleration of the unpowered engine by controlling the clutch to transfer torque from the rotating machine to the unpowered engine and decreasing rotation of the machine.