ELECTRICAL FAN CONTROL [SKYACTIV-D 2.2]

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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

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Operation


Engine coolant temperature conditions

•  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.
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A/C conditions

•  The PCM controls the output duty according to the refrigerant pressure and vehicle speed when the A/C switch is on.

Vehicle speed
Refrigerant pressure
1.0 MPa {10 kgf/cm2 145 psi} or less
1.7 MPa {17 kgf/cm2, 247 psi} or more
1.9 MPa {19 kgf/cm2, 276 psi} or more
Less than 85 km/h {53 mph}
30%
75%
100%
85 km/h {53 mph} or more
0%
0%
0%