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.

ATX

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MTX

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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

1.9 MPa {19 kgf/cm2, 276 psi} or more

1.91 MPa {19.5 kgf/cm2, 277 psi} or more
0 km/h {0 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
30 km/h {19 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
40 km/h {25 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
50 km/h {31 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
60 km/h {37 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
80 km/h {50 mph}
Duty: 14 %
Duty: 65 %
Duty: 65 %
85 km/h {53 mph} or more
Duty: 0 %
Duty: 0 %
Duty: 0 %