ABC control unit, component description - GF32.50-P-4501R

MODEL 230 as of 1.3.06 with CODE (487) Active Body Control (ABC) 

Location 

The ABC control unit is installed on the left behind the cockpit crossmember.

Task 

The ABC control unit is used in the partially active suspension system, Active Body Control (ABC).

The system uses four hydraulic plungers to apply active force to each wheel.

The control intervention functions are 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, monitored and actuated by the control unit.

Functions 

The system performs the following functions:

• Speed-dependent, adjustable level control
• Body damping
• Body leveling when cornering and when braking/accelerating

This improves vehicle dynamics and ride comfort.

Signal inputs and outputs 

Direct inputs: 

• ABC pressure sensor (B4/5), integrated in ABC front axle valve unit (Y36/1)
• Left front ABC pressure sensor (B4/8), integrated in ABC front axle valve unit
• Right front ABC pressure sensor (B4/9), integrated in ABC front axle valve unit
• Left rear ABC pressure sensor (B4/10), integrated in ABC rear axle valve unit (Y36/2)
• Right rear ABC pressure sensor (B4/11), integrated in ABC rear axle valve unit
• Left rear level sensor (B22/7)
• Left front level sensor (B22/8)
• Right front level sensor (B22/9)
• Right rear level sensor (B22/10)
• Left front body lateral acceleration sensor (B24/3)
• ABC right front body lateral acceleration sensor (B24/4)
• Left rear body lateral acceleration sensor (B24/5)
• ABC lateral acceleration sensor (B24/12)
• Wake-up line, coming from driver-side SAM control unit (N10/10)
• Terminal 31
• Terminal 87

Discrete outputs: 

• ABC front axle valve unit with:
  • Left front suspension strut control valve (Y36/1y1)
  • Right front suspension strut control valve (Y36/1y3)
  • Left front suspension strut blocking valve (Y36/1y2)
  • Right front suspension strut blocking valve (Y36/1y4)
• ABC rear axle valve unit with:
  • Left rear suspension strut control valve (Y36/2y1)
  • Right rear suspension strut control valve (Y36/2y3)
  • Left rear suspension strut blocking valve (Y36/2y2)
  • Right rear suspension strut blocking valve (Y36/2y4)
• ABC suction restrictor valve (Y86/1)