Transmission Control Module
The Transmission Control Module (TCM) is an integral part of the mechatronic valve block. The TCM is located at the bottom of the automatic transmission, within the fluid pan. The TCM is the main controlling component of the automatic transmission.
The TCM processes signals from the automatic transmission speed and temperature sensors, Powertrain Control Module (PCM) and other vehicle systems. From the received signal inputs and pre-programmed data, the TCM calculates the correct gear, torque converter clutch setting and optimum pressure settings for gear shift.
The TCM controls the engine disconnect clutch in the hybrid drive assembly. This enables the PCM to disconnect the petrol engine from the transmission when using the Motor Generator (MG) to power the vehicle. The PCM communicates with the TCM via the FlexRay with the request to operate the engine disconnect clutch. The PCM controls the speed of the petrol engine and the MG to match the road speed when changing over between them.
For additional information, Refer to: TRANSMISSION DESCRIPTION
The PCM supplies the Engine Management System (EMS) data over the FlexRay.