ELECTRICAL FAN CONTROL [SKYACTIV-D 1.8]

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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

•  Output duty ratio is controlled according to the refrigerant pressure when the A/C switch is on.

Vehicle speed

Refrigerant pressure

0.6 MPa {6 kgf/cm2, 87 psi} or less

0.8 MPa {8 kgf/cm2, 116 psi} or less

1.0 MPa {10 kgf/cm2, 145 psi} or less

1.3 MPa {13 kgf/cm2, 189 psi} or less

1.5 MPa {15 kgf/cm2, 218 psi} or less

1.7 MPa {17 kgf/cm2, 247 psi} or less

1.9 MPa {19 kgf/cm2, 276 psi} or more
Idle
15 %
15 %
30 %
48 %
56 %
75 %
75 %
20 km/h {12 mph} or less
0 %
0 %
30 %
48 %
56 %
75 %
75 %
40 km/h {25 mph} or less
0 %
0 %
30 %
48 %
56 %
75 %
75 %
65 km/h {40 mph} or less
0 %
0 %
30 %
48 %
56 %
75 %
75 %
105 km/h {65.2 mph} or more
0 %
0 %
0 %
0 %
0 %
0 %
75 %


Exhaust air temperature condition

•  If all of the following conditions are met to suppress temperature increase inside the engine compartment, the output duty is controlled at a ratio of 60%.
―  Exhaust gas temperature sensor No.3: 450 °C {842 °F} or more
―  Vehicle speed: 50 km/h {31 mph} or less


After cooling control

•  To suppress temperature increase inside the engine compartment, the cooling fan operates (output duty ratio: 33 %) for up to 9 min under the following condition.
―  Exhaust gas temperature sensor No.3: 450 °C {842 °F} or more