Active Body Control ABC

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ABC is among the highest quality suspension system on the market. It delivers optimum handling and comfort thanks to automatic suspension adjustment adapted to the driving situation.

Crosswind stabilization has been added to ABC and is activated at speeds of 80 km/h when driving on straight roads or routes with moderate bends. Heavy or rapid driver steering corrections will deactivate crosswind stabilization.
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Optimum handling and comfort.

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Detailed information

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ABC features all-round self-levelling with the same functions as apply with AIRMATIC.
Four computer-controlled spring struts with plunger cylinders virtually eliminate pitching, rolling and vertical movements.

In order to assess the prevailing driving situation, a microprocessor analyses the signals from the lateral, longitudinal and vertical acceleration sensors and from the pressure sensors assigned to each spring strut. The level of the body is determined by level sensors on the control arms of the front and rear axles. Servohydraulic valves then apply the calculated control signals in the form of volumetric oil flow rates which serve to adjust the plunger cylinders.

The engine's pressure supply system provides the servohydraulic valves with hydraulic pressure of up to 200 bar. The constantly available system pressure and the employed accumulators enable Active Body Control (ABC) to respond to initial signs of body movement in a fraction of a second. The blocking valves installed in valve blocks prevent the vehicle from dropping when stationary. An effective concept for cooling and oil supply rounds off the hydraulic design of the system.

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