Regulated differential lock control unit

The regulated differential lock control unit is used for the control of the regulated differential lock (GHAS) in vehicles of the M GmbH. The regulated differential lock control unit is located in the luggage compartment floor in the area in front of the battery.

The regulated differential lock evaluates the dynamic handling characteristics signals made available from other control units. The regulated differential lock control unit uses these to determine the respective locking torque. The regulated differential lock control unit activates the servomotor which operates the multidisc clutch via a ball runway mechanism. For controlling the torque, the motor position angle of the servomotor is detected via 2 hall effect sensors. The communication of the electronic control with the vehicle occurs via FlexRay. There is a temperature sensor installed on the circuit board of the regulated differential lock control unit. For excessive temperature in the regulated differential lock control unit (above 105°Celsius), the regulated differential lock (GHAS) is switched off.

Fig 1: Identifying Regulated Differential Lock Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

The following actuators and sensors are connected directly to the regulated differential lock control unit:

• Servomotor
• Temperature sensor in the servomotor
• Rotor position sensor (2 hall effect sensors)
• Transmission oil temperature sensor of the rear axle differential