Semi-active damper valve means and method

摘要

An improved method and means for control and accomplishment of semi-damper assembly 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 assembly. A voice coil actuated valve slider is operable within the piston of the damper assembly to modulate the damping coefficient in conjunction with check valves. The delay of damper state transition from high to low damping is accomplished independent of the particular control policy utilized until the fluid pressure differential across the valve slide is a preselected low value. Commanded valve switching and motion condition sensing requirements are also minimized by the reversible check valves. Damper state transitions normally required based on a sign change in relative velocity are accomplished without commanded slider movement by the check which are fluid pressure actuated according to the direction of fluid flow through the damper.