Semi-active damper valve means with electromagnetically movable discs in the piston
US4921272A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2800/912
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved method and means for control and accomplishment of semi-active damper means transition between high damping and low damping states is provided which takes advantage of the available inherent dynamic fluid pressure forces produced by the condition of motion between supported and supporting members. Deferral or delay of damper state transitions to avoid force discontinuities or system noise is accomplished mechanically, or automatically internal to the structure of the adjustable valve means. The delay of damper state transition from high to low and low to high damping is accomplished independent of the particular control policy utilized until the fluid pressure differential across the valve ring members is a preselected low value. Commanded valve switching and motion condition sensing requirements are also minimized by reversible check valve means. Damper state transitions normally required based on a sign change in relative velocity are accomplished without actuated change in valve ring position by one of the inner and outer valve rings (in the "off" state) which floats between flow permitting and flow restricting positions dependent upon the direction of fluid flow thr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.