Active torsional vibration damper
First Claim
1. A method of damping resonance torsional vibrations in a system having a member capable of transmitting a torque, the method comprising the steps of:
- detecting a resonance torsional vibration in the member;
estimating time periods when the resonance torsional vibration is between peak angular amplitudes at a damping location;
imparting a plurality of successive torsional impulses to the member at said damping location, wherein each of said torsional impulses being imparted over a portion of one of said time periods in a direction opposite to a twisting motion from the resonance torsional vibration; and
sizing said torsional impulses to have sufficient energy to damp the resonance torsional vibration such that said peak angular amplitudes are maintained less than a threshold amplitude.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of smart damping resonance torsional vibrations in a member capable of transmitting torque, such as a pulse driven rotating shaft. The damping system damps resonance torsional vibrations in the driven shaft by automatically imparting periodic torsional impulses in the opposite direction to the twisting motion from the torsional vibration. The periodic torsional impulses are of sufficient energy to effect damping in the driven shaft. In one specific vehicle driveline embodiment, a housing is attached to one end of the crank shaft of an internal combustion engine. The housing contains a high speed damper flywheel and an eddy current brake attached to the shaft with the ability to apply torsional impulses to the damper flywheel. The eddy current brake is controlled by a computer that continuously receives rotation rate information and torsional vibration amplitude signals from sensors mounted on the crank shaft. The computer calculates the appropriate torsional impulse magnitude and timing to apply at the damper location and then commands the eddy current brake accordingly.
201 Citations
12 Claims
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1. A method of damping resonance torsional vibrations in a system having a member capable of transmitting a torque, the method comprising the steps of:
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detecting a resonance torsional vibration in the member; estimating time periods when the resonance torsional vibration is between peak angular amplitudes at a damping location; imparting a plurality of successive torsional impulses to the member at said damping location, wherein each of said torsional impulses being imparted over a portion of one of said time periods in a direction opposite to a twisting motion from the resonance torsional vibration; and sizing said torsional impulses to have sufficient energy to damp the resonance torsional vibration such that said peak angular amplitudes are maintained less than a threshold amplitude. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of damping resonance torsional vibrations in a system having a member capable of transmitting a torque, the method comprising the steps of:
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detecting a resonance torsional vibration in the member; periodically estimating a time period when the resonance torsional vibration is between peak angular amplitudes at a damping location; periodically imparting torsional impulses to the member at said damping location over a portion of said time period in a direction opposite to a twisting motion from the resonance torsional vibration; wherein said torsional impulses have sufficient energy to damp the resonance torsional vibration such that said peak angular amplitudes are maintained less than a threshold amplitude; wherein said detecting step includes the steps of; measuring a magnitude of the resonance torsional vibration for at least one location along the member; determining whether said magnitude exceeds a minimum threshold value; wherein said estimating step includes the steps of; identifying what operating conditions of the system excite resonance torsional vibrations; measuring a frequency of the resonance torsional vibration at each of said operating conditions; storing a frequency measurement for each of said operating conditions; and sensing an operating condition of the system when the resonance torsional vibration is detected. - View Dependent Claims (9, 10, 11)
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12. A method of damping resonance torsional vibrations in a system having a member capable of transmitting a torque, the method comprising the steps of:
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detecting a resonance torsional vibration in the member; periodically estimating a time period when the resonance torsional vibration is between peak angular amplitudes at a damping location; periodically imparting torsional impulses to the member at said damping location over a portion of said time period in a direction opposite to a twisting motion from the resonance torsional vibration; wherein said torsional impulses have sufficient energy to damp the resonance torsional vibration such that said peak angular amplitudes are maintained less than a threshold amplitude; and wherein said imparting step is performed at a frequency about equal to the frequency of the detected resonance torsional vibration.
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Specification