RDU Operation

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RDU Operation

Power distribution clutch motor for RDU:

The RDU System consists of an open type differential with an electronically controlled clutch pack that varies the torque applied to the rear axle shafts. The system has the capability to vary the amount of torque to the rear axles by controlling the clutch engagement pressure.

Economy Mode: When the RDU clutch pack is not engaged, the open differential allows the rear axle system to operated as a freewheeling axle, with no torque being transmitted from the RDU to either rear axle. In this mode the vehicle will operate as a 2WD system.

Connect Mode: When the AWD module determines that the AWD system function may be needed, the clutch pack is engaged to a "kiss point" by the actuator, spinning the rear axles up to speed. Once the wheel speed reaches a certain threshold, the power transfer unit will be connected (via the Torque mode), with torque provided to the RDU.

Torque Mode: When the vehicle is in torque mode, the RDU clutch motor will receive angular position commands to provide a requested amount of drive torque from the drive shaft to the rear axles. The RDU controls receive a torque request in Nm, which is converted into a motor angular position request value. These incoming torque requests are updated every 10ms by the AWD module.