JPS6120693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for an electric fan device for an automobile engine, and in particular, an electric fan device for an automobile engine including an electric motor for driving a radiator cooling fan and an electric motor for driving a cooler condenser cooling fan. This invention relates to a drive control device for an electric fan device.

A radiator that radiates heat from engine cooling water and a cooler condenser for the vehicle interior air conditioner are spaced apart from each other in the front and back direction with respect to the air flow, and a fan for cooling the radiator and a fan for cooling the cooler condenser are installed side by side. An electric fan device for an automobile engine is known in which each of these fans is driven by an individual electric motor. In such an electric fan device for an automobile engine, energization of the electric motor of the radiator cooling fan and the electric motor of the cooler condenser cooling fan must be controlled according to the temperature of the engine cooling water and the operating state of the air conditioner. It is also preferable that the applied voltage and rotational speed be controlled accordingly.
By doing so, the electric motor for the radiator cooling fan and the electric motor for cooling the cooler capacitor can be driven within the minimum necessary range, reducing fan noise, saving power consumption, and preventing overcooling.

The present invention appropriately controls the energization of the motor for the radiator cooling fan and the motor for cooling the cooler condenser using a simple control circuit according to the temperature of the engine coolant and the operating state of the air conditioner. To provide a drive control device that controls the voltage applied to the two electric motors according to the temperature of engine cooling water and the operating state of an air conditioner without using a device, and drives the two electric motors within the minimum necessary range. The purpose is to

According to the present invention, the present invention provides a drive control device for an electric fan device in which a radiator cooling fan and a cooler condenser cooling fan are rotationally driven by separate electric motors. and a second switching position in which only one of the two motors is connected to the power supply. a first open/close switch that selectively connects only the other of the two electric motors to the power supply; A second opening/closing switch that closes when the air conditioner is on and opens when the cabin air conditioner is off, a water temperature switch that is sensitive to the engine coolant temperature, and a pressure that is sensitive to the refrigerant pressure in the cabin air conditioning refrigerant circuit. The water temperature switch and the pressure switch switch the changeover switch when the water temperature switch detects a temperature above a predetermined value or when the pressure switch detects a pressure above a predetermined value. When the water temperature switch detects a temperature below a predetermined position and the pressure switch detects a pressure below a predetermined value, the water temperature switch is set to the second switching position and the first open/close switch is closed. This is accomplished by an electric fan drive control device connected to set the changeover switch in the first changeover position and open the first opening/closing switch.

According to this configuration, when the engine cooling water is at high temperature or the refrigerant is at high pressure, which requires a relatively large amount of cooling air, the radiator cooling fan motor and the cooler capacitor cooling motor are connected in parallel to the power supply. As a result, the rated voltage is applied to each of the two electric motors, and these two electric motors operate at full output to drive each fan, ensuring the necessary amount of cooling air at this time. Furthermore, when the compressor of the air conditioner, where the engine cooling water temperature and refrigerant pressure are low, is activated, the two electric motors are connected in series to the power supply, and each of the two electric motors has a voltage that is substantially 1/1/2 of the rated voltage. A voltage equal to 2 is applied, causing the two motors to operate at a power state corresponding to substantially 1/4 of their respective full power states to drive each fan. Therefore, at this time, each fan is driven at a relatively low rotation speed to appropriately cool the cooler condenser. As a result, fan noise can be reduced and power consumption can be reduced compared to when the first and second electric motors operate at full output in the above-mentioned state.
It also prevents the radiator from overcooling.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The attached FIG. 1 is an electrical circuit diagram showing one embodiment of a drive control device according to the present invention. In Fig. 1, 1 indicates a radiator for dissipating heat from engine cooling water, and 2 indicates a cooler condenser for air conditioning in the vehicle interior. They are spaced apart in the front and back direction. A radiator cooling fan 3 and a cooler condenser cooling fan 4 are provided behind the radiator 1, and these fans are individually driven by first and second electric motors 5 and 6, respectively. It's getting old. The first and second electric motors 5 and 6 are supplied with current from a power source 7 through an ignition switch 8, a fuse 9,
It is designed to be supplied via relay switches 10, 11, and 12. The two electric motors 5 and 6 are connected in parallel when both the break contact 10a of the relay switch 10 (changeover switch) and the break contact 11a of the relay switch 11 (first opening/closing switch) are closed. In response to this, the make contact 10b of the relay switch 10 and the make contact 12a of the relay switch 12 (second open/close switch) are both closed, and the relay switch 1
When one break contact 11a is open, the current supplied by the power source 7 can be applied in a serially connected manner. The electromagnetic coils 10c and 11b of the relay switches 10 and 11 receive current supplied from the power source 7 to the ignition switch 8, water temperature switch 13, and pressure switch 14.
It is now selectively supplied through the process. The water temperature switch 13 is sensitive to the engine cooling water temperature, and closes when the engine cooling water temperature is below a predetermined value, and opens when the engine cooling water temperature is above a predetermined value. The pressure switch 14 is sensitive to the refrigerant pressure in the refrigerant circuit for air conditioning the vehicle interior, and is configured to close when the refrigerant pressure is below a predetermined value and open when the refrigerant pressure is above a predetermined value. The electromagnetic coil 12b of the relay switch 12 is supplied with the current supplied by the power source 7 when a cooler compressor 15 for air conditioning the vehicle interior is energized. Further, the air supplied from the power source 7 to the cooler compressor 15 is an ignition switch 8, a fuse 16, a cooler main switch 17, and a cooler amplifier device 18.
It is now selectively supplied through the process.

It is now assumed that the ignition switch 8 is closed when starting the engine. At this time, if the engine cooling water temperature and refrigerant pressure are below the predetermined values, both the water temperature switch 13 and the pressure switch 14 are closed, so the relay switches 10 and 11 are closed.
The electromagnetic coils 10c and 11b are energized, and the make contact 10b of the relay switch 10 is energized.
is closed, the break contact 11 of the relay switch 11
a opens. Also at this time, the cooler main switch 1
7 is open and the cooler compressor 15 is not energized, the make contact 12a of the relay switch 12 is open, so the first and second motors 5 and 6 are not energized, so this Both electric motors have stopped. On the other hand, when the cooler main switch 17 is closed and the cooler compressor 15 is energized, the make contact 12a of the relay switch 12 is closed, so the first and second electric motors 5 and 6 are connected in series. connected and in this manner can be provided with the current supplied by the power supply 7. Therefore, at this time, a voltage equivalent to approximately 1/2 of the voltage when the motors 5 and 6 are connected in parallel is applied to the motors 5 and 6, and the fans 3 and 4 rotate at a rotation speed corresponding to the voltage. .

When at least one of the water temperature switch 13 and the pressure switch 14 is opened because the engine cooling water temperature exceeds a predetermined value or the refrigerant pressure in the refrigerant circuit exceeds a predetermined value, the relay switches 10 and 11 open. Since the electromagnetic coils 10c and 11b are no longer energized at the same time, both the break contact 10a of the relay switch 10 and the break contact 11a of the relay switch 11 are closed. Therefore, at this time, the first and second electric motors 5, 6 are connected in parallel with each other and in this manner are given the current supplied by the power source 7. At this time, the output voltage of the power supply 7 (corresponding to the rated voltage of the motor) is applied to each of the first and second motors 5 and 6, and both motors operate at full output.
As described above, according to the present invention, the connection state of two electric motors to the power source can be controlled by a simple switch circuit.
The voltage applied to both electric motors changes depending on the engine cooling water temperature and the operating state of the cabin air conditioner, and the voltage applied to both motors changes by switching between series and parallel, and the rotation and stopping of the fan and the rotation speed are controlled. controlled.

FIG. 2 shows another embodiment of the drive device according to the invention. Note that parts in FIG. 2 that correspond to those in FIG. 1 are designated by the same reference numerals as those in FIG. 1. In such an embodiment, relay switches 10 and 1 in the embodiment described above
1 is composed of one relay switch 20. This relay switch 20 has two break contacts 20a, 20b and one make contact 2.
0c, and an electromagnetic coil 2 that opens and closes these contacts.
0d. Therefore, this embodiment is the first example.
It will be clear that it operates in exactly the same way as the embodiment shown in the figures.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of a drive control device for an electric fan device for an automobile according to the present invention, and FIG. 2 is an electric circuit diagram showing another embodiment thereof. 1~Radiator, 2~Cooler condenser, 3~
Radiator cooling fan, 4-cooler condenser cooling fan, 5-first electric motor, 6-second electric motor, 7-power supply, 8-ignition switch,
9~fuse, 10~12~relay switch, 1
3~Water temperature switch, 14~Pressure switch, 15~
Compressor for cooler, 16~ fuse, 17~
Cooler main switch, 18 ~ Cooler amplifier device, 20 ~ Relay switch.

Claims (1)

[Claims] 1. In a drive control device for an electric fan device configured such that a radiator cooling fan and a cooler condenser cooling fan are rotationally driven by separate electric motors, the radiator cooling fan electric motor and the cooler condenser cooling electric motor a changeover switch configured to switch between a first switching position in which the motors are connected in series with each other to a power supply and a second switching position in which only one of the two motors is connected to the power supply; a first open/close switch that selectively connects only the other of the two motors to the power source; and a first open/close switch that selectively opens and closes the series circuit of the two electric motors and closes when the vehicle interior air conditioner is on. A second opening/closing switch that opens when the vehicle interior air conditioning system is in an off state, a water temperature switch that is sensitive to engine cooling water temperature, and a pressure switch that is sensitive to refrigerant pressure in a refrigerant circuit for vehicle interior air conditioning, and the water temperature switch and The pressure switch sets the changeover switch to the second switching position when the water temperature switch detects a temperature above a predetermined value or when the pressure switch detects a pressure above a predetermined value, and When the first open/close switch is closed and the water temperature switch detects a temperature below a predetermined position and the pressure switch detects a pressure below a predetermined value, the changeover switch is switched to the first switch. a drive control device for an electric fan, which is connected to the position and opens the first opening/closing switch;