Circuit/System Description

The APM and PIM are fastened together and are referred to as the drive motor/generator control module assembly. The drive motor/generator control module assembly is cooled with pre-mixed DEX-COOL® circulating through a cooling system that is separate from the engine cooling system. The power electronics cooling system utilizes a heat exchanger at the front of the vehicle and two electric pumps to circulate the coolant. The engine control module (ECM) monitors a temperature sensor in the power electronics cooling system and operates the radiator fan and the power electronics coolant pump in response to power electronics cooling system temperature.