ELECTRICAL FAN CONTROL [SKYACTIV-G 2.5T]

id0140h0205000


Outline

•  To improve engine reliability and cooling performance, operates the cooling fan according to the vehicle conditions and cools the radiator and condenser.
•  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 operation time and rotation speed of the cooling fan motor.

Block Diagram

ac5uun00004041

Operation


Engine coolant temperature condition

•  Output duty ratio is controlled according to the engine coolant temperature as indicated in the graph.
ac5uun00004059


A/C operation condition

•  Controls the demand airflow volume depending on 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} or less
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
30 km/h {19 mph} or more
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
40 km/h {25 mph} or more
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
50 km/h {31 mph} or more
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
60 km/h {37 mph} or more
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
80 km/h {50 mph} or more
14 MPa {143 kgf/cm2, 2031 psi}
55 MPa {561 kgf/cm2, 7977 psi}
55 MPa {561 kgf/cm2, 7977 psi}
85 km/h {53 mph} or more
0 MPa {0 kgf/cm2, 0 psi}
0 MPa {0 kgf/cm2, 0 psi}
0 MPa {0 kgf/cm2, 0 psi}


After cooling control

•  When the engine is stopped after high-load driving, the cooling fan operates for up to 9 min under the following conditions to suppress temperature increase inside the engine compartment.
―  After driving on ascending roads or continuous driving under high-load conditions
―  After continuous, sudden acceleration from standstill and repeated, sudden acceleration


Conditions during collision

•  If a collision signal from the SAS control module is received, the PCM stops the engine cooling fan to avoid use of battery voltage.