Patent ID: 7611152

Claim:
An active chassis system of a motor vehicle having two axles with two wheels each, comprising: a plurality of spring elements, each spring element arranged between a body of the vehicle and one of the wheels; a plurality of hydraulic piston-cylinder actuators, each hydraulic piston-cylinder actuator arranged between the body of the vehicle and one of the wheels; a pilot-operated directional valve for each axle for control of vehicle roll motion, said directional valve hydraulically communicating with the hydraulic piston-cylinder actuators of its axle; and a controllable throttle for each axle connected in parallel with control pressure ports of the directional valve of its axle, wherein each of the hydraulic piston-cylinder actuators has a piston located within a cylinder of the piston-cylinder actuator which divides the cylinder into working chambers having different cross-sectional areas, a hydraulic supply line is assigned to each working chamber of each of the two actuators of each axle to convey hydraulic pressure provided by a delivery pump for each axle, the working chambers of the two actuators of each axle having smaller cross-sectional areas are hydraulically connected to one another, the controllable throttle of each axle is connected hydraulically between the working chambers of the two actuators of its axle having larger cross-sectional areas, and the controllable throttle of each axle is arranged to permit adjustment of a pressure drop, which depends on at least one of a direction of rotation and a delivery output of its axle's delivery pump, between its hydraulically connected working chambers.