Cooling fan control unit

Abstract

The present invention provides a cooling fan control device that can prevent snow from accumulating in the front grille opening, regardless of the vehicle's speed. [Solution] The fan motor control circuit (vehicle cooling fan control device) comprises a cooling fan located at the front of the vehicle and facing the radiator, a fan motor (actuator) that rotates the cooling fan, and a motor controller (control unit) that causes the fan motor to control the rotation, stopping, and rotation direction of the cooling fan according to at least the ambient temperature and coolant temperature of the vehicle.

Description

Technical Field

[0001] The present invention relates to a cooling fan control device.

Background Art

[0002] Patent Document 1 discloses a snow adhesion prevention structure for preventing snow from adhering to the front bumper by providing a hole in the front bumper of a vehicle to drop the snow adhering to the front grille.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to the snow adhesion prevention structure disclosed in Patent Document 1, the snow adhering to the front grille was blown off by the wind pressure during running. Therefore, when the vehicle speed was low, a sufficient effect could not be obtained.

[0005] An object of the present invention is to provide a cooling fan control device capable of preventing snow from adhering to the opening of the front grille regardless of the vehicle speed of the vehicle.

Means for Solving the Problems

[0006] To achieve the above object, a cooling fan control device according to the present invention includes a cooling fan located in front of a vehicle and facing a radiator, an actuator that rotationally drives the cooling fan, and a control unit that controls at least the rotation, stop, and rotation direction of the cooling fan with respect to the actuator according to at least the outside air temperature and the cooling water temperature of the vehicle.

[0007] This configuration prevents snow from accumulating in the front grille opening regardless of the vehicle's speed, thereby preventing a decrease in cooling performance due to reduced heat dissipation from the radiator.

[0008] Furthermore, in the cooling fan control device according to the present invention, the control unit, when the ambient temperature of the vehicle is below a first predetermined value and the coolant temperature of the vehicle is above a second predetermined value, causes the actuator to rotate in a direction such that the air from the cooling fan is blown outwards in front of the vehicle.

[0009] With this configuration, if there is a risk of snow accumulating on the front grille and the coolant is sufficiently warm, the cooling fan can blow air toward the front grille to remove any snow that has accumulated on it and prevent further snow accumulation.

[0010] Furthermore, in the cooling fan control device according to the present invention, the control unit, when the coolant temperature of the vehicle is above a third predetermined value, causes the actuator to rotate in a rotational direction such that the air from the cooling fan is blown into the interior of the vehicle.

[0011] With this configuration, if the cooling water reaches a predetermined temperature or higher, the cooling water can be cooled immediately.

[0012] Furthermore, in the cooling fan control device according to the present invention, the control unit, when the vehicle speed of the vehicle is less than or equal to a fourth predetermined value, does not instruct the actuator to rotate the cooling fan in a direction that blows air from the cooling fan forward of the vehicle.

[0013] This configuration prevents snow blown from the front grille or airflow from the cooling fan from hitting people in front of the vehicle when it is stationary. [Effects of the Invention]

[0014] According to the present invention, it is possible to prevent snow from accumulating in the opening of the front grille. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a block diagram showing an example of a schematic configuration of a cooling fan control device according to an embodiment. [Figure 2] Figure 2 shows an example of a fan motor control circuit according to the embodiment. [Figure 3] Figure 3 is a state transition diagram showing an example of the control specifications for the cooling fan in the fan motor control circuit of the embodiment. [Figure 4] Figure 4 is a flowchart showing an example of the processing flow performed by the fan motor control circuit of the embodiment. [Figure 5] Figure 5 is a flowchart showing an example of the processing flow performed by a modified fan motor control circuit of the embodiment. [Modes for carrying out the invention]

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0017] (Outline configuration of the cooling fan control device) The schematic configuration of the cooling fan control unit according to an embodiment of the present invention will be explained using Figure 1. Figure 1 is a block diagram showing an example of the schematic configuration of the cooling fan control device according to the embodiment.

[0018] A motor controller 24, which is an example of a control unit, controls the rotation state of a fan motor 23 that rotates a cooling fan 22 mounted on the vehicle 10 to generate cooling air to cool the coolant flowing to the radiator 20. In this embodiment, the vehicle 10 is an electric vehicle and is equipped with an inverter 21 that converts the DC voltage of a battery (not shown) into AC voltage. The power semiconductors, which are switching elements of the inverter 21, generate a lot of heat when in operation, so the inverter 21 needs to be properly cooled.

[0019] The radiator 20 is located in front of the vehicle 10. The radiator 20 sucks in air from the front of the vehicle 10 by the rotation of the cooling fan 22 installed in a state facing itself. In this case, the air flows in the negative X-axis direction in FIG. 1. The sucked-in air flows inside the radiator 20 and cools the cooling water that has been heated while cooling the inverter 21. More specifically, the cooling water that has been heated while cooling the inverter 21 flows through the cooling water passage 14 in the direction of arrow A and flows into the radiator 20. The cooling water cooled by the radiator 20 flows through the cooling water passage 15 in the direction of arrow B and cools the inverter 21 again.

[0020] By the rotation of the cooling fan 22, external air is sucked in from the plurality of openings 12 provided in the front grille 11 of the vehicle 10. Note that the fan motor 23 that rotationally drives the cooling fan 22 is, for example, a DC motor with brushes. And the rotation state of the fan motor 23 is controlled by the motor controller 24. Specifically, the motor controller 24 controls the rotation, stop, rotation speed, and rotation direction of the fan motor 23 according to the measured values of the outside air temperature sensor 25, the water temperature sensor 26, and the vehicle speed sensor 27, and the state of the power switch 28. Note that the fan motor 23 is an example of an actuator in the present disclosure.

[0021] The outside air temperature sensor 25 is a sensor that measures the outside air temperature of the vehicle 10 (hereinafter simply referred to as the outside air temperature).

[0022] The water temperature sensor 26 is, for example, a sensor that measures the temperature of the heated cooling water flowing out from the inverter 21 (hereinafter simply referred to as the cooling water temperature).

[0023] The vehicle speed sensor 27 is a sensor that measures the traveling speed of the vehicle 10.

[0024] The power switch 28 outputs a signal indicating that the vehicle 10 is in a state where it can travel.

[0025] Furthermore, the motor controller 24 reverses the rotation of the fan motor 23 when the environment of the vehicle 10 is in a specific state, thereby blowing air from the cooling fan 22 outwards from the vehicle 10, i.e., in the positive X-axis direction in Figure 1. The specific state is one in which snow may accumulate in the opening 12 of the vehicle's front grille 11, and the cooling water of the inverter 21 has not warmed up sufficiently, making it possible to cool the inverter 21 without cooling the cooling water. The specific state will be described in more detail later (see Figure 3).

[0026] The motor controller 24, ambient temperature sensor 25, water temperature sensor 26, vehicle speed sensor 27, and power switch 28 constitute a fan motor control circuit 30 (see Figure 2) that controls the rotation state of the fan motor 23. Details of the fan motor control circuit 30 will be described later (see Figure 2). The fan motor control circuit 30 is an example of a cooling fan control device in this disclosure.

[0027] In this embodiment, we will explain using an example of cooling an inverter 21 installed in an electric vehicle, but the object of cooling is not limited to the inverter 21. For example, an engine, which is an example of an internal combustion engine, may also be the object of cooling.

[0028] (Fan motor control circuit configuration) The configuration of the fan motor control circuit 30 will be explained using Figure 2. Figure 2 is a diagram showing an example of a fan motor control circuit according to the embodiment.

[0029] As shown in Figure 2, the fan motor control circuit 30 includes a motor controller 24, an ambient temperature sensor 25, a water temperature sensor 26, a vehicle speed sensor 27, a fan motor 23, a DC power supply 29, and relays R1, R2, and R3.

[0030] The ambient temperature sensor 25, the water temperature sensor 26, and the vehicle speed sensor 27 measure the various values ​​mentioned above and input them to the motor controller 24. The motor controller 24 also monitors the state of the power switch 28 to determine whether the vehicle 10 is in a drivable state.

[0031] Relays R1 and R2 are interrupters that control the rotation direction of the fan motor 23. The state of relays R1 and R2 is controlled by the rotation direction control signal from the motor controller 24. For example, in Figure 2, relay R1 is supplied with a DC voltage from the DC power supply 29. Since relay R2 is grounded, a current flows through the fan motor 23 in the direction of arrow C. The fan motor 23 then rotates in the direction corresponding to the current in the direction of arrow C.

[0032] On the other hand, when relay R1 is grounded by the rotation direction control signal from motor controller 24 and DC voltage from DC power supply 29 is supplied to relay R2, a current flows through fan motor 23 in the direction of arrow D, which is opposite to arrow C. Then, fan motor 23 rotates in the opposite direction to before.

[0033] Relay R3 is an interrupter that controls the rotation and stopping of the fan motor 23. The state of relay R3 is controlled by an ON / OFF control signal from the motor controller 24. Specifically, when relay R3 conducts due to the ON / OFF control signal from the motor controller 24, the DC voltage from the DC power supply 29 is supplied to the fan motor 23, causing the fan motor 23 to rotate. On the other hand, when relay R3 is disconnected due to the ON / OFF control signal from the motor controller 24, the DC voltage from the DC power supply 29 is not supplied to the fan motor 23, causing the fan motor 23 to stop.

[0034] The specific configuration of relays R1, R2, and R3 is not specified. That is, relays R1, R2, and R3 may be contact relays (mechanical relays) as shown in Figure 2, or they may be contactless relays composed of switching devices such as MOS FETs.

[0035] (Fan motor control details) Using Figure 3, the control details of the fan motor 23 performed by the motor controller 24 will be specifically explained. Figure 3 is a state transition diagram showing an example of the control specifications for the cooling fan in the fan motor control circuit of this embodiment.

[0036] The cooling fan 22 has three states: a stopped state S1 in which it does not rotate, a forward rotation state S2 in which it rotates in the direction of drawing air in from outside the vehicle 10, and a reverse rotation state S3 in which it rotates in the direction of blowing air out of the vehicle 10. The motor controller 24 switches each state according to the measured values ​​of the outside temperature sensor 25 and the water temperature sensor 26. The signal from the vehicle speed sensor 27 will be used in a modified embodiment described later.

[0037] First, let's explain the case where the cooling fan 22 is in the stopped state S1.

[0038] If the cooling fan 22 is in the stopped state S1, and the cooling water temperature measured by the water temperature sensor 26 is less than 57°C, the motor controller 24 maintains the stopped state S1 (state transition A1).

[0039] If the cooling fan 22 is in the stopped state S1, and the cooling water temperature measured by the water temperature sensor 26 is 57°C or higher, the motor controller 24 controls the fan motor 23 so that the cooling fan 22 is in the forward rotation state S2 (state transition A2). Note that the cooling water temperature of 57°C is an example of a third predetermined value in this disclosure.

[0040] When the cooling fan 22 is in the stopped state S1, if the ambient temperature measured by the ambient temperature sensor 25 is 5°C or less, and the coolant temperature measured by the water temperature sensor 26 is 50°C or more higher than the ambient temperature, the motor controller 24 controls the fan motor 23 so that the cooling fan 22 is in the reverse rotation state S3 (state transition A3). Note that an ambient temperature of 5°C is an example of a first predetermined value in this disclosure. Also, the difference of 50°C between the coolant temperature and the ambient temperature is an example of a second predetermined value in this disclosure. When the cooling fan 22 is in the reverse rotation state S3, the air warmed by the coolant, which is 50°C or more higher than the ambient temperature, is blown out of the vehicle 10 through the front grille 11, so that snow attached to the front grille 11 can be removed. In addition, since the front grille 11 is warmed, snow accumulation can be prevented.

[0041] Next, we will describe the case where the cooling fan 22 is in the forward rotation state S2.

[0042] If the cooling fan 22 is in the forward rotation state S2, and the cooling water temperature measured by the water temperature sensor 26 is 55°C or higher, the motor controller 24 maintains the forward rotation state S2 (state transition A4).

[0043] If the cooling fan 22 is in the forward rotation state S2, and the cooling water temperature measured by the water temperature sensor 26 is less than 55°C, the motor controller 24 stops the cooling fan 22 (state transition A5).

[0044] Next, we will describe the case where the cooling fan 22 is in the reverse rotation state S3.

[0045] If the cooling fan 22 is in reverse rotation state S3, and the ambient temperature measured by the ambient temperature sensor 25 is 5°C or less, and the coolant temperature measured by the water temperature sensor 26 is less than 57°C, and furthermore, the coolant temperature is 50°C or more higher than the ambient temperature, the motor controller 24 maintains the reverse rotation state S3 (state transition A6).

[0046] When the cooling fan 22 is in reverse rotation state S3, if the cooling water temperature measured by the water temperature sensor 26 is 57°C or higher, or if the cooling water temperature measured by the water temperature sensor 26 is less than 57°C and the cooling water temperature is less than 50°C higher than the ambient temperature, or if the cooling water temperature measured by the water temperature sensor 26 is less than 57°C and the cooling water temperature is 50°C or higher than the ambient temperature and the ambient temperature measured by the ambient temperature sensor 25 is more than 5°C, the motor controller 24 stops the cooling fan 22 (state transition A7).

[0047] Although not shown in the state transition diagram of Figure 3, the motor controller 24 may further control the rotational speed of the fan motor 23, i.e., the rotational speed of the cooling fan 22, according to the measured values ​​of the ambient temperature sensor 25, the water temperature sensor 26, and the vehicle speed sensor 27.

[0048] Furthermore, the ambient temperature and coolant temperature values ​​shown in Figure 3 are examples only and are not limited to the values ​​shown in Figure 3.

[0049] (Process flow performed by the cooling fan control unit) The processing flow of the fan motor control circuit 30 will be explained using Figure 4. Figure 4 is a flowchart showing an example of the processing flow of the fan motor control circuit in this embodiment.

[0050] The motor controller 24 determines whether the coolant temperature measured by the water temperature sensor 26 is less than 57°C (step S11). If it is determined that the coolant temperature is less than 57°C (step S11: Yes), the process proceeds to step S12. On the other hand, if it is not determined that the coolant temperature is less than 57°C (step S11: No), the process proceeds to step S17.

[0051] In step S11, if it is determined that the coolant temperature is less than 57°C, the motor controller 24 determines whether the coolant temperature measured by the water temperature sensor 26 is 50°C or higher than the ambient temperature measured by the ambient temperature sensor 25 (step S12). If it is determined that the coolant temperature is 50°C or higher than the ambient temperature measured by the ambient temperature sensor 25 (step S12: Yes), the process proceeds to step S13. On the other hand, if it is not determined that the coolant temperature is 50°C or higher than the ambient temperature measured by the ambient temperature sensor 25 (step S12: No), the process proceeds to step S19.

[0052] In step S12, if the coolant temperature is determined to be 50°C or more higher than the ambient temperature measured by the ambient temperature sensor 25, the motor controller 24 determines whether the ambient temperature measured by the ambient temperature sensor 25 is 5°C or lower (step S13). If it is determined that the ambient temperature is 5°C or lower (step S13: Yes), the process proceeds to step S14. On the other hand, if it is not determined that the ambient temperature is 5°C or lower (step S13: No), the process proceeds to step S19.

[0053] In step S13, if it is determined that the outside temperature is 5°C or lower, the motor controller 24 issues an instruction to the fan motor 23 to rotate the cooling fan 22 in the reverse direction, that is, to rotate the cooling fan 22 in a direction that blows air out of the vehicle 10 (step S14).

[0054] The motor controller 24 determines whether the coolant temperature measured by the water temperature sensor 26 is less than 57°C (step S15). If it is determined that the coolant temperature is less than 57°C (step S15: Yes), the process proceeds to step S16. On the other hand, if it is not determined that the coolant temperature is less than 57°C (step S15: No), the process proceeds to step S19.

[0055] In step S15, if it is determined that the coolant temperature is less than 57°C, the motor controller 24 determines whether the power switch 28 of the vehicle 10 is OFF (step S16). If it is determined that the power switch 28 of the vehicle 10 is OFF (step S16: Yes), the motor controller 24 terminates the process. On the other hand, if it is not determined that the power switch 28 of the vehicle 10 is OFF (step S16: No), the process returns to step S12.

[0056] Let's return to step S11. In step S11, if it is determined that the coolant temperature is not below 57°C, the motor controller 24 instructs the fan motor 23 to rotate the cooling fan 22 in the forward direction, that is, to rotate the cooling fan 22 in a direction that draws in air from outside the vehicle 10 (step S17).

[0057] The motor controller 24 determines whether the coolant temperature measured by the water temperature sensor 26 is less than 55°C (step S18). If it is determined that the coolant temperature is less than 55°C (step S18: Yes), the process proceeds to step S19. On the other hand, if it is not determined that the coolant temperature is less than 55°C (step S18: No), the process returns to step S17.

[0058] In step S18, if it is determined that the coolant temperature is less than 55°C, and in step S12 described above, if it is determined that the coolant temperature is not 50°C or more higher than the ambient temperature measured by the ambient temperature sensor 25, in step S13, if it is determined that the ambient temperature is not 5°C or lower, and in step S15, if it is determined that the coolant temperature is not less than 57°C, the motor controller 24 issues an instruction to the fan motor 23 to stop the cooling fan 22 (step S19).

[0059] Next, the motor controller 24 determines whether the power switch 28 of the vehicle 10 is OFF (step S20). If it is determined that the power switch 28 of the vehicle 10 is OFF (step S20: Yes), the motor controller 24 terminates the process. On the other hand, if it is not determined that the power switch 28 of the vehicle 10 is OFF (step S20: No), the process returns to step S11.

[0060] Furthermore, even when the power switch 28 is OFF, if the cooling water temperature measured by the water temperature sensor 26 is higher than a predetermined value, the motor controller 24 may continue to instruct the fan motor 23 to rotate the cooling fan 22 in the forward direction for a predetermined period of time.

[0061] (Modified example of the embodiment) Next, a modified version of the embodiment will be described. In this modified version, the rotation state of the cooling fan 22 is controlled more precisely according to the vehicle speed of the vehicle 10 measured by the vehicle speed sensor 27 provided in the fan motor control circuit 30 described in the embodiment.

[0062] (Processing flow performed by the fan motor control circuit in a modified embodiment) Figure 5 illustrates the processing flow of the fan motor control circuit 30 in a modified embodiment. Figure 5 is a flowchart showing an example of the processing flow of the fan motor control circuit in a modified embodiment.

[0063] The flowchart in Figure 5 shows almost the same process as the flowchart in Figure 4; therefore, only the differences from the flowchart in Figure 4 will be explained.

[0064] The processes in steps S21, S22, and S23 in the flowchart of Figure 5 are equivalent to the processes in steps S11, S12, and S13 in the flowchart of Figure 4, respectively.

[0065] In step S23, if it is determined that the outside temperature is 5°C or lower, the motor controller 24 determines whether the vehicle speed of the vehicle 10 measured by the vehicle speed sensor 27 is greater than 0 and 20 km / h or less (step S24). If it is determined that the vehicle speed of the vehicle 10 is greater than 0 and 20 km / h or less (step S24: Yes), the process proceeds to step S25. On the other hand, if it is not determined that the vehicle speed of the vehicle 10 is greater than 0 and 20 km / h or less (step S24: No), the process proceeds to step S30. Note that a vehicle speed of 20 km / h is an example of a fourth predetermined value in this disclosure.

[0066] In step S24, if it is determined that the vehicle speed of the vehicle 10 is greater than 0 and 20 km / h or less, the motor controller 24 issues an instruction to the fan motor 23 to reverse the rotation of the cooling fan 22, that is, to rotate the cooling fan 22 in a direction that blows air to the outside of the vehicle 10 (step S25).

[0067] On the other hand, if in step S24 the vehicle speed of the vehicle 10 is not determined to be greater than 0 and 20 km / h or less, the motor controller 24 issues an instruction to the fan motor 23 to stop the cooling fan 22 (step S30).

[0068] In other words, when vehicle 10 is stopped (vehicle speed is 0) or when vehicle speed exceeds 20 km / h, the motor controller 24 does not instruct the fan motor 23 to reverse the rotation of the cooling fan 22.

[0069] Note that the processing flow from step S26 onwards is the same as the processing flow from step S15 onwards in Figure 4.

[0070] In this way, by not reversing the cooling fan 22 when the vehicle 10 is stopped (vehicle speed is 0), it is possible to prevent snow blown from the front grille 11 from hitting, for example, a person standing directly in front of the stopped vehicle 10, or a pedestrian crossing directly in front of the vehicle 10 that has stopped before a crosswalk.

[0071] Furthermore, by not reversing the rotation of the cooling fan 22 when the vehicle speed of vehicle 10 exceeds 20 km / h, cooling of the inverter 21 can be prioritized while the vehicle is in motion.

[0072] Furthermore, the vehicle 10 may be equipped with a camera to monitor the area in front, and the cooling fan 22 may be prevented from rotating in reverse only when the vehicle speed of the vehicle 10 is 0 and no people are visible in the image captured by the camera.

[0073] (Effects of the embodiment) As described above, the fan motor control circuit 30 (vehicle cooling fan control device) of this embodiment includes a cooling fan 22 located in front of the vehicle 10 and facing the radiator 20, a fan motor 23 (actuator) that rotates the cooling fan 22, and a motor controller 24 (control unit) that causes the fan motor 23 to control the rotation, stopping, and rotation direction of the cooling fan 22 according to at least the ambient temperature and coolant temperature of the vehicle 10. Therefore, snow accumulation on the opening 12 of the front grille 11 can be prevented regardless of the vehicle speed of the vehicle 10. This prevents deterioration of cooling performance due to a reduction in the amount of heat dissipated by the radiator 20.

[0074] Furthermore, in the fan motor control circuit 30 (cooling fan control device) of this embodiment, the motor controller 24 (control unit) rotates the fan motor 23 (actuator) in a rotational direction that blows air outwards to the front of the vehicle 10 when the ambient temperature of the vehicle 10 is 5°C (first predetermined value) or less and the coolant temperature of the vehicle 10 is 50°C (second predetermined value) or more higher than the ambient temperature. Therefore, if there is a risk of snow accumulating on the front grille and the coolant is warm enough, the air from the cooling fan 22 can be blown out to the outside of the vehicle 10 through the front grille 11 to remove the snow adhering to the front grille. In addition, since the front grille 11 is warmed, snow accumulation on the front grille can be prevented.

[0075] Furthermore, in the fan motor control circuit 30 (cooling fan control device) of this embodiment, the fan motor control circuit 30 (control unit) rotates the fan motor 23 (actuator) in a direction that draws in outside air from the vehicle 10 when the coolant temperature of the vehicle 10 is 57°C (third predetermined value) or higher. Therefore, if the coolant temperature exceeds the predetermined temperature, the coolant can be cooled immediately.

[0076] Furthermore, in the modified fan motor control circuit 30 (cooling fan control device) of the embodiment, the fan motor control circuit 30 (control unit) does not rotate the fan motor 23 (actuator) in the direction that blows air forward of the vehicle 10 when the vehicle speed of the vehicle 10 is 20 km / h (fourth predetermined value) or less. Therefore, when the vehicle 10 is stopped, it is possible to prevent snow blown from the front grille 11 or the wind from the cooling fan 22 from hitting a person in front of the vehicle 10.

[0077] Although embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. This novel embodiment can be implemented in various other forms. Furthermore, various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Moreover, this embodiment is included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0078] 10 vehicles 11 Front Grille 12 Openings 14,15 Cooling channel 20 radiators 21 Inverter 22 Cooling Fans 23. Fan motor (actuator) 24 Motor Controller (Control Unit) 25. Outdoor temperature sensor 26 Water temperature sensor 27. Vehicle speed sensor 28 Power Switch 29 DC power supply 30. Fan motor control circuit (cooling fan control device) R1, R2, R3 Relay S1 Stopped state S2 Forward rotation state S3 Reverse rotation state

Claims

1. Located at the front of the vehicle, the cooling fan faces the radiator, An actuator that rotates the cooling fan, The system includes, at a minimum, a control unit that causes the actuator to control the rotation, stopping, and direction of rotation of the cooling fan according to the ambient temperature and coolant temperature of the vehicle. Cooling fan control device.

2. The control unit, When the ambient temperature of the vehicle is below a first predetermined value, and the coolant temperature of the vehicle is above a second predetermined value, the actuator is instructed to rotate the cooling fan in a direction that blows air outwards in front of the vehicle. The cooling fan control device according to claim 1.

3. The control unit, When the coolant temperature of the vehicle is above a third predetermined value, the actuator is instructed to rotate the cooling fan in a direction that draws in air from outside the vehicle. A cooling fan control device according to claim 1 or claim 2.

4. The control unit, When the vehicle speed of the vehicle is below a fourth predetermined value, the actuator is instructed not to rotate the cooling fan in the direction that blows air forward of the vehicle. The cooling fan control device according to claim 1.

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