Cooling Fan Circuit [06/2015 - ]: Description

For the cooling fan, the FC control ECU calculates the fan speed needed for cooling based on the FC stack assembly coolant temperature, A/C switch, air conditioner refrigerant pressure and vehicle speed information, and sends a control signal to the cooling fan with controller motor. Based on the duty ratio in the signal from the FC control ECU, the continuously variable speed of the cooling fan with controller motor is controlled. In response to driving conditions, the FC control ECU sends a signal to the cooling fan with controller motor to control fan speed to the optimal level, achieving a balance between cooling performance and silent operation.