Starter/Generator Cooling
The starter/generator is liquid cooling using a stand-alone cooling system that is separate from the engine's cooling system.
The starter/generator cooling system contains the following serviceable components:
- Starter/Generator Control Module
- Starter/Generator Coolant Temperature Sensor
- Starter/Generator Coolant Pump
Starter/Generator Control Module
The Starter/Generator Control Module monitors the starter/generator coolant temperature sensor. When the coolant temperature indicates that starter/generator cooling is required, the Starter/Generator Control Module commands the starter/generator coolant pump on. The Starter/Generator Control Module provides ground to the starter/generator coolant pump relay coil through a dedicated low side driver. The will cause the starter/generator coolant pump relay switch to closed, providing B+ to the starter/generator coolant pump.
Starter/Generator Coolant Temperature Sensor
The starter/generator coolant temperature sensor is a variable resistor that measures the temperature of the starter/generator coolant. The Starter/Generator Control Module supplies 5 V to the signal circuit and a ground for the low reference circuit. The starter/generator coolant temperature sensor resistance changes with starter/generator coolant temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases. The Starter/Generator Control Module monitors the starter/generator coolant temperature sensor to determine the temperature of the starter/generator coolant. As the coolant temperature changes, the Starter/Generator Control Module will turn the starter/generator coolant pump on or off to accommodate the starter/generator cooling requirements.
Starter/Generator Coolant Pump
The drive motor coolant pump is a single speed ON/OFF pump that circulates coolant through the starter/generator radiator and the starter/generator to control the temperature of the starter/generator.