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What is A Mercedes ABC System?

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 13 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, three 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 are prone to failure, hazardous when fail, but 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 11 mm (0.43 in) between
the speeds of 60–160 km/h (37–99 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 “ABC 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 (except for SL350) and CL Class
models and on S Class (only S600, S55 AMG and S65 AMG) models sold in the U.S..


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