System for controlling a chassis

A system for controlling spring cylinders that serve as a semiactive shock absorber for a vehicle body, in which

• said spring cylinders are disposed between wheel suspensions and the vehicle body, at least one chamber of each spring cylinder communicates via line means with a pressure fluid supply means,
• at least one control member (9) being connected between said pressure fluid supply means and the at least one chamber,
• said at least one control member (9) including a control valve (10), and further including a shunt line (13) disposed between the control valve (10) and a spring cylinder line (2a), said shunt line (13) includes a throttle (12) and discharges into a pressure chamber (26) provided in said control valve (10), a reservoir (33) is connected to said shunt line between said throttle and said pressure chamber (26) and together with said throttle forms a low-pass filter,
• said control valve being responsive to a change in pressure in the shunt line, said control valve further includes a slide means (22) provided with a piston (25) at one extremity thereof, the slide means being operable by motion of said piston within said at least one chamber, said pressure chamber (26) includes a spring (27) disposed between a bottom portion (28) thereof and the piston (25), the slide (22) is associated on an opposite extremity thereof, with a control magnet (24), and a low frequency pressure course involved in a motion of the vehicle body is set in accordance with a set-point value via said control valve (10).