Active damping during clutch engagement for engine start
AssigneeFord Global Technologies, LLC
InventorsQing Wang, Wei Liang, Mark Steven Yamazaki, Walter Joseph Ortmann, Ming Lang Kuang
Life of this patent
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Abstract
An active damping system provides a torque adjustment command that is combined with the raw motor torque command of a vehicle to compensate for oscillations and vibrations in the driveline of a hybrid vehicle. Active damping may be provided by a derivative controller or by a lead-lag compensation between initiation of clutch engagement and full clutch engagement. Active damping is terminated upon full clutch engagement.
Claims15
A hybrid vehicle comprising:
- a motor;
- an engine and a battery for supplying power to the motor;
- a hydraulically actuated disconnect clutch selectively connects the motor and the engine;
- and
- at least one controller configured to modify motor torque based upon driveline speed during a period of clutch engagement after an engine start to suppress a driveline oscillation during the period of clutch engagement, wherein the motor torque is modified based upon a derivative controller that receives an input signal representative of a speed of rotation of a driveline component.
A method of operating a hybrid vehicle having an engine that is selectively connected to a driveline by a disconnect clutch that is selectively actuated by hydraulic pressure and a motor comprising:
- during a period of clutch engagement after an engine start that ends upon full clutch engagement attenuating oscillations in the driveline by modifying motor torque, and wherein attenuating oscillations in the driveline is performed based upon a derivative controller that receives an input indicative of a driveline component speed.
Dependencies are inferred from the claim text.