GF32.50-P-0001R Active Body Control (ABC), Function

GF32.50-P-0001R Active body control (ABC), function
- with CODE (487) Active body control (ABC)
- as of 1.3.06 up to model year 08

Component Identification:

Active Body Control (ABC)

The Active Body Control (ABC) system is a full-bearing suspension system, i.e. the system uses four hydraulic suspension struts to apply active force to each wheel.

The control intervention function is effective up to a frequency range of approx. 5 Hz. For this purpose, the system requires an extensive sensor and actuator system which is evaluated, actuated and monitored by the control unit.

The overall "ABC" system consists of the following electrical components:
^ ABC control unit
^ Left rear level sensor
^ Left front level sensor
^ Right front level sensor
^ Right rear level sensor
^ ABC lateral acceleration sensor
^ Left front body lateral acceleration sensor
^ Right front body lateral acceleration sensor
^ Left rear body lateral acceleration sensor
^ ABC front axle valve unit
- ABC pressure sensor
- Left front ABC pressure sensor
- Right front ABC pressure sensor
^ ABC rear axle valve unit
- Left rear ABC pressure sensor
- Right rear ABC pressure sensor
^ ABC suction restrictor valve
^ Level adjustment switch
^ ABC SPORT switch

The active ABC suspension system is different from ordinary suspension systems because it uses dynamically adjustable hydraulic cylinders at the wheels and does not use stabilizer bars.

The hydraulic cylinders are switched in series to the coil springs and move to produce forces that counteract deviations from tire uniformity.This allows the rolling motion of the body to be fully compensated when cornering at up to maximum lateral acceleration. The Active Body Control (ABC) control unit always adjusts the suspension and damping characteristics to the current driving conditions.

The following values are recorded using sensors:

^ lateral acceleration,
^ vertical body acceleration and the
^ relative travel between the wheels and body level
^ pressure in the suspension struts

These actual values are constantly compared to the specified values and adapted correspondingly.

Advantages of ABC system compared to conventional suspension:

^ As a result of the active body damping, it is possible to use very soft, passive shock absorbers which improve vibration and tire comfort considerably.
^ Despite the absence of stabilizer bars, the ABC system compensates the typical body roll when cornering and the pitch motion when accelerating or braking.
^ Vibrations and jolts which are caused by road bumps can be dampened more effectively than with conventional suspension systems.
^ The required and usual handling characteristics are retained even when the vehicle is loaded.

Variants

^ National version
^ Engine version

The Active Body Control (ABC) control unit configures itself automatically via CAN-C.