Shift Motor Control

The FCM will have the ability to vary the speed of the transfer case motor through pulse width modulation (PWM). It is PWM from 0 to 100% at 100Hz.

The PWM will function as follows:

• Apply an initial duty cycle (APPROXIMATELY 94%) to shift motor control wires.
• Control the acceleration of the shift motor by increasing the applied duty cycle at a specified rate.
• Control the deceleration of the shift motor by updating the applied duty cycle to the shift motor control wires at a specified rate based upon the difference between the desired position and the current position.