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System Description
 
 
System Diagram
Component partsFunction
Crankshaft position sensorCrankshaft Position Sensor
Exhaust camshaft position sensorExhaust Camshaft Position Sensor
Engine coolant temperature sensorEngine Coolant Temperature Sensor
Refrigerant pressure sensorRefrigerant Pressure Sensor
BatteryECM receives the battery voltage signal.
A/C auto amp.ECM receives below signal via CAN communication
  • A/C ON signal
  • A/C evaporator temperature signal
  • Target A/C evaporator temperature signal
  • Blower fan ON signal
Combination meterECM receives the vehicle speed signal via CAN communication.
IPDM E/RECM transmits the A/C relay control signal via CAN communication.
Cooling fan relayCooling Fan
Cooling fan motor
 
 
SYSTEM DESCRIPTION
Cooling fan control signal is sent to IPDM E/R from ECM by CAN communication line. Then, IPDM E/R sends ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty signal, cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan speed is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.
 
 
Cooling Fan Speed Request for Cooling the Engine
Cooling fan speed for cooling the engine is judged based on vehicle speed, engine coolant temperature, air conditioner ON signal, refrigerant pressure, target A/C evaporator temperature, and A/C evaporator temperature.