Active Body Control

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Mercedes-Benz S Class

Mercedes-Benz CL Class

Mercedes-Benz SL Class
Active Body Control, or ABC, is the Mercedes-Benz brand name used to describe fully-active suspension, that allows control of the vehicle body motions and therefore virtually eliminates body roll in many driving situations including cornering, accelerating, and braking.
In the ABC system, a computer detects body movement from sensors located throughout the vehicle, and controls the action of the active suspension with the use of hydraulic servomechanisms. The hydraulic pressure to the servos is supplied by a high pressure radial piston hydraulic pump. A total of thirteen sensors continually monitor body movement and vehicle level and supply the ABC controller with new data every ten milliseconds. Four level sensors, one at each wheel measure the ride level of the vehicle, 3 accelerometers measure the vertical body acceleration, one acceleration sensor measures the longitudinal and one sensor the transverse body acceleration. At each hydraulic cylinder a pressure sensor monitors the hydraulic pressure. As the ABC controller receives and processes data, it operates four hydraulic servos, each mounted in series on a spring strut, beside each wheel. Almost instantaneously, the servo regulated suspension generates counter forces to body lean, dive, and squat during various driving maneuvers. A suspension strut, consisting of a steel coil spring and a shock absorber are connected in parallel, as well as a hydraulically controlled adjusting cylinder, are located between the vehicle body and wheel. These components adjust the cylinder in the direction of the suspension strut, and change the suspension length. This creates a force which acts on the suspension and dampening of the vehicle in the frequency range up to five hertz.
The system also incorporates height adjustable suspension, which in this case lowers the vehicle up to eleven millimeters between the speeds of 60 km/h (37 mph) and 160 km/h (99 mph) for better aerodynamics, fuel consumption, and handling.
The ABC system also allows self-levelling suspension, which raises or lowers the vehicle in response to changing load (i.e. the loading or unloading of passengers or cargo). Each vehicle equipped with ABC has an BC Sport button that allows the driver to adjust the suspension range for different driving style preferences. This feature allows the driver to adjust the suspension to maintain a more level ride in more demanding driving conditions. It was introduced in 1999 on the top-of-the-line Mercedes-Benz CL-Class. This system is standard on all Mercedes-Benz SL and CL Class models and on some S Class models sold in the U.S.
Similar technology
1955 Citro?n DS had hydropneumatic suspension, which had the height adjustable suspension and self-levelling suspension features of ABC, but controlled purely by hydraulic action, since computers in that era were larger than an automobile
1965 Rolls-Royce Silver Shadow had technology licensed from Citro?n DS, height adjustable suspension and self-levelling suspension features of ABC
1975 Mercedes-Benz 450SEL 6.9 flagship, had the height adjustable suspension and self-levelling suspension features of ABC
1979 Mercedes-Benz W126 then new S class had even more sophisticated height adjustable suspension and self-levelling suspension features of ABC
1984 Mercedes-Benz W124 selected models of E class had this technology (rear only hydraulic suspension) height adjustable suspension and self-levelling suspension features of ABC
Mid-1980s, Lotus Cars experimented with active suspension layouts, combining hydraulic and electronic components.
1989 Citro?n XM had a similar electronic control of hydraulic suspension, branded Hydractive.
1991 Toyota Soarer had a fully active hydraulic suspension system on the 1991 UZZ32 model.
1994 Citro?n Xantia Activa variant introduced a fully active suspension known as Hydractive 2
External links
Mercedes-Benz USA
Mercedes-Benz International
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