Aspen 4WD V8-5.7L Hybrid (2009)
Transfer Case Actuator: Description and Operation
Shift Motor - Operation
OPERATION
Shifting in the transfer case occurs when a Pulse Width Modulated (PWM) voltage is supplied to the shift motor (1) by the Final Drive Control Module
(FDCM). A linear analog position sensor (encoder) (3) located on the rear transfer case housing and provides the FDCM with the motor's angular,
rotational position. With this information, the FDCM continuously knows the position of the motor, and therefore allows it to accurately control the
operation of the motor, including voltage polarity which is used to control motor direction.
The electronically controlled wet clutch pack uses an electric motor to actuate an internal gear train, clutch cam, and low range barrel cam. The clutch
cam actuates the clutch levers that apply normal force to the multi-disc wet clutch pack. The clutch discs are alternately splined to the front and rear
outputs. When normal force is applied to this clutch pack, torque is transferred to equalize speed differences between the front and rear axles.
