ELECTRICAL FAN CONTROL [SKYACTIV-D 2.2]
id0140z7205000
Outline
• Through cooling of the radiator and condenser by operation of the cooling fan according to vehicle conditions, engine reliability and cooling performance have been improved.
• The PCM determines the engine operation conditions based on the signal from each sensor and performs duty-control of the fan control module to control the rotation speed of the cooling fan motor.
Block diagram
Operation
Engine coolant temperature conditions
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• Output duty ratio is controlled according to the engine coolant temperature as indicated in the graph.
• While the engine coolant temperature is decreasing, it is controlled at a different temperature from that of when the engine coolant temperature is increasing.
A/C conditions
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• Output duty ratio is controlled according to the refrigerant pressure when the A/C switch is on.
