Control Unit: Description and Operation

DESCRIPTION





The Electronic Limited Slip Differential Module (ELSD) (1) is a microprocessor-based assembly, controlling the rear axle. The ELSD can send 0 to 100% torque from the wheel that is slipping to the other wheel, on the rear axle. The transfer case controls slip from front to rear. The ELSD controls slip from left to right within the rear differential. The ELSD controls an electric motor which drives a gear set which moves a ball ramp to apply force to a wet clutch. This clutch is used to control torque split. Motor position feedback is done with two hall effect sensors on the motor. There is also a temperature sensor on the motor. ELSD will be temporarily disabled with high temperatures on the motor. Communication is via the CAN serial bus. Inputs include: Vehicle speed, Wheel speed, Terrain mode ELSD position sensor, and VIN, odometer for diagnostics. Outputs include: Actual rear differential torque, ELSD status, and PWM control of rear ELSD motor.

The ELSD Module is installed inside the passenger compartment underneath the left side of the rear seat.