DRIVE BATTERY COOLING FAN CONTROL


During the quick charge, large currents are input into the drive battery to swiftly complete the charge. When the READY indicator is illuminated, the large currents are input into the drive battery.This causes the temperatures in the drive battery to easily increase. For this reason, the BMU drives the drive battery cooling fan, according to the drive battery cooling request signal from the PHEV-ECU. The air circulation in the drive battery cools the temperatures.


When the quick charge is performed or when the READY indicator is illuminated, the BMU should send the module temperature information to the PHEV-ECU through the CAN.
The PHEV-ECU should send the driving battery cooling request signal to the BMU when one of the following two conditions is met:

To the drive battery cooling fan, the BMU inputs the PWM signal in accordance with the drive battery cooling request signal. Therefore, the drive battery cooling fan is driven.
When the drive battery temperature increases and is higher than the specified temperature, the PHEV-ECU should drive the radiator fan or send the compressor operation request signal to the compressor & heater controller through the CAN. Thus, the drive battery cooling evaporator cools the air in the drive battery.
Cooling air flow in drive battery

The cooling air is designed to flow among the modules to balance the temperatures.