Connecting Mode

To connect the power transfer unit, the two halves of the Dog clutch must be within 40 RPM of each other. The AWD module calculates the speed differential based on transmission OSS, RDU Driveshaft Speed, and power transfer unit gear ratio. The actuator motor will energize and rotate the gear reduction drive and the actuator cam against the shift fork. When the dog clutch teeth line up, the cam pushes the shift fork into position and the clutch engages. It can take approximately 100 - 150ms for the dog clutch to engage after the command is sent.