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.
Claims5
A hybrid vehicle comprising:
- a motor;
- an engine and a battery for supplying power to the motor;
- a disconnect clutch operatively connected between the motor and the engine wherein the disconnect clutch is selectively provided with hydraulic pressure to actuate the disconnect clutch;
- 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.
A method of operating a hybrid vehicle having an engine that is selectively connected to a driveline by a disconnect clutch and a motor wherein the disconnect clutch is selectively provided with hydraulic pressure to actuate the disconnect clutch 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.
Dependencies are inferred from the claim text.