Transmission and Drivetrain: Description and Operation

The electronically controlled multi-plate transfer type AWD system consist of a transfer hydraulic pressure control unit incorporating a vehicle speed sensor, control unit, and duty solenoid and a transfer clutch.

The control unit stores optimum transfer clutch torque data for a variety of driving conditions. When actual driving conditions are detected by the sensors, the control unit selects a duty ratio most suitable to the given condition from the memory. It then controls the operation of the transfer clutch by means of the hydraulic pressure which controls the duty solenoid and provides optimum rear torque distribution.

Various sensors and the control unit also serve as gear shift control, lock-up control and hydraulic pressure control.

The AWD transfer system is housed in the extension case together with the bearing and rear drive shaft.