Patent ID: 7197384

Claim:
A regulatable spring-and-damper system in a vehicle, comprising a spring element and a damping element mounted in parallel, wherein one of the elements is adjustable, wherein, to realize a semi-active system, the spring element is passive and the damping element is configured with a damping characteristic that can be regulated in a variable manner, wherein the semi-active system can be described according to a force profile (F S ) such that F S =−c·z−d u ·ż, where c denotes a spring constant of the passive spring element, d u denotes a damping value that can be regulated in a variable manner, z denotes a state variable of the system, and ż denotes the derivative with respect to time of the state variable, wherein the damping element is regulated by the damping value (d u ) following at least approximately the relationship d u = - c · z + f ⁡ ( z , z . , u , u . ) z . , where u denotes a manipulated variable, {dot over (u)} denotes the derivative with respect to time of the manipulated variable, and ƒ denotes a known function, wherein the function (ƒ) is known from an actively regulatable reference system with an adjustable final control element and the force profile (F R ) of the reference system can be described by the relationship F R =−ƒ( z,ż,u,{dot over (u)}), and wherein the manipulated variable (u) or the derivative with respect to time ({dot over (u)}) of the manipulated variable of the adjustable final control element is determinable in a closed-loop and open-loop control unit according to a stored mathematical relationship.