MAN Truck & Bus

Roll Stabilisation with CDC

Zwei Lkw mit Wankstabilisierung
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Roll stabilisation A) rolling motion without CDC, B) active roll stabilisation with CDC, C) electronically adjustable shock absorber in the CDC system, 1) electromagnetic proportional valve.

Active roll stabilisation is achieved using stabilisers and infinitely variable electronic control of shock absorber rigidity via CDC (continuous damping control). This constantly and optimally adapts the attenuation requirements to the respective current driving situation in line with the conditions and load. Advantages of the CDC system: increased safety due to a reduction in rolling and pitching movements, comfortable attenuation properties given each load condition, maximum protection of the load even on rough roads, reduced tyre wear and thus lower maintenance costs. 


Movements around the vehicle's longitudinal axis are referred to as roll, movements around the vehicle's transverse axis as pitch ("pitching under braking", for example). Cornering, rapid lane changes or hard braking can in particular cause heavy rolling and pitching movements. These could not only have a negative impact on ride comfort, but also on driving behaviour. In the worst case scenario, the vehicle rocks from side to side due to the self-reinforcing effect. Vehicles with a high centre of gravity, those with a tank/ silo structure for example, are particularly "vulnerable" to rolling and pitching movements. The intensity of a vehicle's superstructure movements can be influenced by the design and coordination of its chassis – in particular the vibration dampers (shock absorbers) and stabilisers.