Electric Controlled Coupling

Fig 1: Electric Controlled Coupling Operation Principle

Courtesy of NISSAN NORTH AMERICA, INC.

1.	Main clutch	2.	Control clutch	3.	Cam
4.	Electromagnet
A.	Torque flow	B.	Current commanded from AWD control unit	C.	From transmission
D.	To front propeller shaft

AWD control unit supplies command current to electric controlled coupling (AWD solenoid).
Control clutch is engaged by electromagnet and torque is detected in control clutch.
The cam operates in response to control clutch torque and applies pressure to main clutch.
Main clutch transmits torque to front wheels according to pressing power.
- Transmission torque to front wheels is determined according to command current.
  
  Fig 2: Current-Torque Graph
  Courtesy of NISSAN NORTH AMERICA, INC.