Title:
CONTROL SYSTEM FOR A VEHICLE SUSPENSION
Document Type and Number:
WIPO Patent Application WO2002060708
Kind Code:
A3
Abstract:
A suspension system (20) controls the amount of compressible fluid (42) within struts (28) to determine spring rate coefficients (K>S<) and dampening coefficients (B>S<) for the struts (28). the spring rate and dampmening coefficients (K>S<, B>S<) are selected to provide foraces (F) which are a sum of several components, which include a desired target static force (F>d<) for balancing various forces acting upon a vehicle chassis, comparison of the target strut force (F>d<) to the actual force (F) applied by the respective struts (28), comparison of velocity (ż>S<) of the chassis relative to a selected reference datum, and a ride height error (e>rh<). Frequency dependant filtering decreases the spring rate coefficients (K>S<) when changes in position (Z>S<) are detected at frequencies (ω) beneath a threshold level (ω>K<), and decreases the dampening coefficients (B>S<) when changes in velocity (Z>S<) are detected at frequencies (ω) above a threshold level (ω>B<).
Inventors:
DAVIS LEO W (US)
Application Number:
PCT/US2002/000699
Publication Date:
February 27, 2003
Filing Date:
January 11, 2002
Export Citation:
Assignee:
DAVIS FAMILY IRREVOCABLE TRUST (US)
DAVIS LEO W (US)
DAVIS LEO W (US)
International Classes:
B60G17/015; B60G17/04; B60G21/067; B60G21/10; F16F5/00; F16F9/34; F16F9/36; F16F9/46; F16F9/512; (IPC1-7): F16F3/00
Foreign References:
| US4877222A | 1989-10-31 | |||
| US4770438A | 1988-09-13 |
Other References:
See also references of EP 1362196A4
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