Elimination of Limit Cycles Due to Signal Estimation in Semi-Active Suspensions 1999-01-0728
Undesirable low frequency vibrations experienced on vehicles equipped with semi-active suspension are observed: when road inputs have significant repetitive component, when there are large control gains in the suspension control algorithm, and when the velocities of the body are estimated by filtering the measured suspension deflections. Stability analysis performed on simple vehicle models demonstrates that interaction between the dynamics of the vehicle and the estimation filter is the root cause of the problem. A vehicle with an active suspension becomes unstable while a vehicle with a semi-active suspension exhibits limit cycles when the above mentioned conditions are present. A solution is proposed in which the control gains are adaptively changed depending on the frequency content of the road spectrum.
Citation: Hac, A. and Fratini, A., "Elimination of Limit Cycles Due to Signal Estimation in Semi-Active Suspensions," SAE Technical Paper 1999-01-0728, 1999, https://doi.org/10.4271/1999-01-0728. Download Citation
Author(s):
Aleksander Hac, Albert V. Fratini
Affiliated:
Delphi Chassis Systems
Pages: 9
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Electronic Steering and Suspension Systems-PT-77, Steering and Suspension Technology Symposium 1999-SP-1438, SAE 1999 Transactions - Journal of Passenger Cars-V108-6
Related Topics:
Mathematical models
Roads and highways
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