Electric Controlled Coupling

In response to command current from AWD control unit, control clutch pull- in force is generated at the electromagnet and torque is generated at the control clutch.

Fig 1: Transmitting Torque From Main Clutch Input Shaft To Output Shaft
Courtesy of NISSAN MOTOR CO., U.S.A.
The cam operates in response to control clutch torque and applies pressure to main clutch.
Main clutch transmits torque from input shaft to output shaft, according to the amount of pressure.
The actual amount of torque transfer is determined by control current as shown in figure below (I-T characteristics figure).

Fig 2: I-T Characteristics Graph
Courtesy of NISSAN MOTOR CO., U.S.A.