Method for damping the vibrations in a suspension system and such a suspension

The method involves subjecting a mass (2) to oscillations and being of certain part (3), where the acceleration of the oscillations is measured over an acceleration sensor (5). The relative movement is measured over a local sensor (7) as well as a pneumatic spring (4). Between the swinging part and the fixed part, the air pressure of measured acceleration and the measured relative is steered in dependence over a control valve (11), so that both acceleration and the relative position is a minimum value. The mechanical or electrical inputs of acceleration of the relative position is recorded. An independent claim is included for suspension.