Description And Operation

DESCRIPTION 

Courtesy of CHRYSLER GROUP, LLC

The Torque Vectoring Module (TVM) (1) controls the Rear Drive Unit (RDU) functions. It is located in the rear of the vehicle.

OPERATION 

The Torque Vectoring Module (TVM) receives information over the Controller Area Network (CAN) data network: 

• From the Chassis Domain Control Module (CDCM), the request for torque distribution
• From the Antilock Brake System (ABS) module, it receives information on lateral acceleration data, the activation status of the Electronic Stability Control (ESC) function and wheel speed
• From the Electronic Power Steering (EPS), the Steering Angle Sensor (SAS)
• From the Powertrain Control Module (PCM), information from the Accelerator Pedal Position Sensor (APPS) and the engine Revolution Per Minute (RPM) sensor
• From the Body Control Module (BCM), the ignition status

The TVM transmits via the CAN data bus: 

• To the CDCM module, the status of the small electric motors and confirmation of torque distribution
• Data on its own operational status and torque implemented

The TVM receives hardwired information directly from the: 

• Small electric motor temperature sensors
• Clutch oil temperature sensors
• Small electric motor position sensors

The TVM module sends hardwired activation commands directly: 

• To the two axle actuator electric motors

REMARKS 

If the ABS module should require the ESC function, the TVM module freezes the request for torque split, coming from the CDCM module, to implement the strategies for the ESC function.

TVM Initialization procedure: 

For each ignition ON, the TVM needs to know the reference point of the small electric motors (the "zero").

For each ignition ON, the TVM commands, at the same instant, the small electric motors and controls the implementation time of the demand for current and the signals from the position sensors.

Estimate of clutch wear: 

In order to properly command the clutch packs in the most correct manner, the TVM needs to know their wear. To know the wear of clutches, it commands the small electric motors to open and close the clutches. The current drawn by the small electric motors can reach peak currents of approximately 20A.

The process of determining clutch wear takes about 45 seconds.

When the status of ignition and of the motor change from "ON" to "OFF" and the values of temperature and battery voltage allow it, the TVM starts the clutch wear estimation procedure and then turns Off.

The first 1, 000 adaptations occur after the first switch-off, after which it will carry it out only after the second shutdown.

For additional information regarding TVM and RDU operation. Refer to DESCRIPTION AND OPERATION .