Suspension/damping, function

P32.50-2012-79

a Suction pipe

b Working pressure

c Control pressure

d Return flow

1 Radial piston pump

2 Oil reservoir

2a Oil filter

9 Oil cooler

14 Front axle pressure reservoir

40 Front suspension strut

41 Rear suspension strut

Y36/1 ABC front axle valve unit

y1 Left front suspension strut control valve

y2 Left front suspension strut shut-off valve

y3 Right front suspension strut control valve

y4 Right front suspension strut shut-off valve

Y36/2 ABC rear axle valve unit

y1 Left rear suspension strut control valve

y2 Left rear suspension strut shut-off valve

y3 Right rear suspension strut control valve

y4 Right rear suspension strut shut-off valve

Y86/1 ABC suction restrictor valve

52 Pressure supply valve unit

52a Pulsation damper

52b Valve pressure limiting valve

53 Return flow pressure reservoir

56 Front bleeder screw

57 Rear bleeder screw

B4/5 ABC pressure sensor

B22/1 Left rear plunger travel sensor

B22/4 Left front plunger travel sensor

B22/5 Right front plunger travel sensor

B22/6 Right rear plunger travel sensor

B40/1 ABC oil temperature sensor

The suspension and damping in the case of the active body control is performed by a hydraulic positioning cylinder (plunger) in each spring strut for the low-frequency body movements (up to approx. 5 Hertz). This cylinder alters the position of the base point of the coil spring for this purpose.

This makes it possible to minimize and optimally damp the following body movements:

- in the direction of the vehicle vertical axis (lift), produced in particular by uneven road surfaces.

- about the vehicle transverse axis (pitch), produced by braking and accelerating as well as undulating road surfaces.

- about the vehicle longitudinal axis (roll), produced in particular by cornering and by a road surface with a differing degree of flatness on the left and right.

The higher-frequency oscillations of the wheels are insulated vis-à-vis the body and damped in a conventional way by means of passive elements (steel springs and shock absorbers with a uniform setting).