Motor Control Module 1 and 2

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Location

Each electric motor generator located within the transmission assembly is controlled by its own motor control module flash-programmable, micro-processor. Each motor control module is contained within the power inverter module. Also contained within the power inverter module is the hybrid powertrain control module micro-processor.

Operating Functions

Each motor control module operates the applicable electric motor generator based upon hybrid powertrain control module commands. Each motor control module controls the speed, direction and output torque of its respective traction motor through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors (IGBTs).

Communication and Hosted Diagnostics

In addition to the internal SPI bus communication circuit between the hybrid powertrain control module and each motor control module, the motor control modules also communicate on the Hi-speed and Hybrid GMLAN communication circuits. The motor control module does not store its own diagnostic trouble code (DTC) information. The hybrid powertrain control module will store motor control module associated DTC information for retrieval by a scan tool. The scan tool can communicate directly with each motor control module in order to retrieve data parameters only.

Circuit Inputs

In addition to GMLAN parameters, each motor control module monitors its respective motor generator for voltage, current, speed, direction and temperature. Additionally, the motor control module monitors the IGBT components for temperature and proper operation. Some of the motor control module operation data is shared with the hybrid powertrain control module.

Circuit Outputs

Each motor control module controls its respective IGBT driver board that in-turn controls each motor generator. The motor generators operate using three-phase alternating current (AC) electricity. Three cables connect each motor generator to the power inverter module. Each individually shielded cable is orange in color to alert the technician that the potential for high voltage is present.