The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Jan. 12, 2001
Leo W. Davis, Dallas, TX (US);
Davis Family Irrevocable Trust, Harlingen, TX (US);
Abstract
A suspension system ( ) controls the amount of compressible fluid ( ) within struts ( ) to determine spring rate coefficients (K ) and dampening coefficients (B ) for the struts ( ). The spring rate and dampening coefficients (K , B ) are selected to provide forces (F) which are a sum of several components, which include a desired target static force (F ) for balancing various forces acting upon a vehicle chassis, comparison of the target strut force (F ) to the actual force (F) applied by the respective struts ( ), comparison of velocity ({dot over (z)} ) of the chassis relative to a selected reference datum, and a ride height error (e ). Frequency dependant filtering decreases the spring rate coefficients (K ) when changes in position (Z ) are detected at frequencies (&ohgr;) beneath a threshold level (&ohgr; ), and decreases the dampening coefficients (B ) when changes in velocity ({dot over (z)} ) are detected at frequencies (&ohgr;) above a threshold level (&ohgr; ).