JP2003013735A - Fan controller for radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a radiator and parts such as a fan switch and a fuse and to keep the cooling performance in the radiator provided with plural cooling fans. SOLUTION: In this fan controller for the radiator provided with a plurality of cooling fans 11, 12, a fan switch 20 for directly switching on and off the cooling fan 11 is connected to one cooling fan 11 between the cooling fans 11, 12, and a relay 30 for switching on the corresponding cooling fan 12 by being excited by the switching-on of the fan switch 20 is connected to the remaining cooling fans 12. Preferably, the fan switch 20 and the relay 30 are connected through a delay circuit 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator fan control device, and more particularly to a radiator fan control device having a plurality of cooling fans.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional radiator fan drive circuit provided with one cooling fan 101. The cooling fan 101 includes a fan switch 102 and a fuse 103.
Also, it is connected to the power source 104 via the wiring 105. The fan switch 102 is provided with a sensor switch that closes the fan drive circuit when the sensor detects that the temperature of the cooling water becomes equal to or higher than the set temperature.

In a radiator provided with one cooling fan 101 as described above, when the radiator main body is made small in order to achieve miniaturization, the cooling fan 101 and its motor are conversely large in order to maintain cooling performance. I have to turn it on. That is, it is difficult to reduce the size while maintaining the cooling performance of the radiator.

On the other hand, the fan drive circuit shown in FIG. 10 has two cooling fans 201 and 201 for one radiator.
02, which is a conventional example including two cooling fans 201,
This is a structure in which 202 are connected in parallel and one fan switch 203 and one fuse 204 are arranged on the trunk wiring 206 from the branch point P to the power source 205. By thus providing a plurality of cooling fans, the cooling fans 201, 20
While avoiding upsizing of 2 and upsizing of the fan motor,
The cooling performance is also maintained.

Further, the fan drive circuit shown in FIG.
This is another conventional example in which one radiator is provided with two cooling fans 301 and 302, and the main wiring 3 is connected to the power source 307.
10 is branched from the branch point P into two branch wirings 311 and 312, and each branch wiring 311 and 312 is a fuse 30.
5, 306 and fan switches 303, 304 are connected to the first and second cooling fans 301, 302. As a result, as in the case of FIG. 10, the cooling fan 3
It is possible to prevent the 01 and 302 and the fan motor from increasing in size, maintain the cooling performance, and reduce the capacity of the fan switches 303 and 304 and the fuses 305 and 306.

[0006]

In the structure having two cooling fans as shown in FIGS. 10 and 11, the size can be reduced while maintaining the cooling performance as described above.
There are still the following issues.

(1) In the structure of FIG. 10, when the fan switch 203 is turned on and the circuit is closed, both cooling fans 2
Since the voltage is applied to 01 and 202 at the same time, the current flowing through the main wiring 206 of the drive circuit instantaneously becomes about three times that in the steady state. To deal with this, the fan switch 203
As a result, a fuse with a large capacity is required, and a fuse with a large capacity is also required.
The trunk wire 206 from 05 to the fan switch 203 also needs to have a large wire diameter.

(2) In the structure shown in FIG. 11, each cooling fan 3
Since the fan switches 303 and 304 and the fuses 305 and 306 are arranged for each 01 and 302, the capacity of the fan switches 303 and 304 and the fuses 305 and 306 can be small, but two fan switches are required, and Since each of the fan switches 303 and 304 operates independently, there is a case where only one cooling fan 301 having a high temperature operates and the remaining cooling fans 302 remain stopped. That is, the cooling fans 301 and 302
There is a difference in the operating rate of each cooling fan, and it is difficult to use multiple cooling fans efficiently. Further, the trunk wiring 310 from the power source 307 to the branch point P still needs to have a thick wire diameter.

Particularly, in the radiator mounted on the motorcycle, the thickness of the wiring, the capacity of the battery and the capacity of the fan switch are limited, so that the above-mentioned problem affects the miniaturization of the radiator and the motorcycle itself. .

[0010]

In order to solve the above problems, according to the invention of claim 1, in a radiator fan control device provided with a plurality of cooling fans, any one of the plurality of cooling fans is provided. It is characterized in that a fan switch for directly turning on and off the cooling fan is connected, and a relay for turning on the corresponding cooling fan by exciting the remaining fan by turning on the fan switch is connected to the remaining cooling fans. As a result, the radiator can be downsized and the cooling performance can be maintained, the capacity can be reduced while reducing the number of fan switches to one, and the relay can also have a small capacity. In addition, further miniaturization can be achieved.

According to a second aspect of the present invention, in the radiator fan control device according to the first aspect, the fan switch and the relay are connected via a delay circuit. As a result, each cooling fan is sequentially activated with a time shift, and the activation current that instantaneously flows when the cooling fan is activated is temporally distributed, and the capacity of the wiring and the fuse can be reduced.

According to a third aspect of the present invention, in the radiator fan control device according to the first or second aspect, a backflow prevention circuit for preventing backflow from the cooling fan is connected to the cooling fan connected to the fan switch. . As a result, after the fan switch is disconnected, even if the cooling fan connected to the fan switch performs inertial rotation to generate power, the current to the relay is cut off, and the cooling fan connected to the relay receives the above power. It is possible to eliminate the phenomenon of continuing to turn for a certain period of time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a schematic left side view of a motorcycle equipped with a radiator according to the present invention, in which an engine 2 is provided below a main frame 3 extending rearward from a head pipe 1. And a radiator 6 is arranged between the engine 2 and the front wheel 5.

FIG. 2 is a plan view of the radiator 6 shown in FIG. 1, in which two first and second cooling fans 11 and 12 are attached in parallel to each other, for example, on the rear surface of the radiator main body 10 having a cooling water pipe incorporated therein. Each cooling fan 1
1 and 12 are surrounded by fan shrouds 13 and 14, respectively, and are connected to fan motors 15 and 16.

FIG. 3 shows a fan drive circuit of the radiator 6 shown in FIG. 2. The main wiring 23 connected to the positive electrode of the power source (battery) 25 has a branch point P at the first and second branch wirings 26,
27, the first branch wiring 26 is connected to the first cooling fan 11 (motor 15) via the fuse 21 and the fan switch 20, and the second branch wiring 27 is connected to the second fuse 32 and the relay. The second cooling fan 12 via 30
(Motor 16).

The relay 30 has a coil portion 30a and a normally open switch portion 30b. When the coil portion 30a is energized and excited, the switch portion 30b is closed and turned on. One end of the coil portion 30a is connected to the fan switch 20 via a connection line 35 for excitation.
Is connected to a branch wiring portion 26a between the first cooling fan 11 and the first cooling fan 11, and the other end is grounded. When the fan switch 20 is in the ON state, the coil portion 30a is energized and excited. . The negative sides of the cooling fans 11 and 12 and the power supply 25 are grounded.

The fan switch 20 is a sensor switch having a temperature sensor and is arranged in the cooling water passage. When the temperature of the cooling water is lower than the set temperature, the fan switch 20 is kept in an off state (open state), When the above is detected, it is switched to the ON state (closed state).

[0018]

When the cooling water temperature is lower than the set temperature during engine operation, the fan switch 20 is off, the coil portion 30a of the relay 30 is not excited, and the switch portion 30b is also off. . Therefore, both cooling fans 1
Both 1 and 12 are stopped.

When the sensor portion of the fan switch 20 detects that the temperature of the cooling water exceeds the set temperature, the fan switch 20 is turned on and the first cooling fan 11 is activated, and at the same time, the coil portion of the relay 30 is activated. 30a is excited and the switch section 30b is turned on, and the second cooling fan 1
2 also starts.

At the time of starting the cooling fans 11 and 12, the starting current is divided into the two branch wirings 26 and 27, and each fuse 2
Since the fan switches 20 and 20 flow through the fan switch 20 and the relay 30, a small one suitable for the single cooling fan 11 can be used as the fan switch 20, and a small relay 30 can also be used. .

When the sensor portion of the fan switch 20 detects that the cooling water temperature becomes lower than the set temperature, the fan switch 20 is first opened and turned off, whereby the first
The cooling fan 11 is stopped, while the coil portion 30a of the relay 30 is de-energized and the switch portion 30b is turned off, so that the second cooling fan 12 is also stopped.

After the fan switch 20 is opened, the first cooling fan 11 may rotate by inertia for a while to generate electric power. In this case, the generated electric power is supplied to the relay 30, and the second electric power is supplied to the relay 30. The cooling fan 12 may continue to rotate for a while (for example, about 5 seconds) even after the first cooling fan 11 is stopped, but there is no functional impact.

[Second Embodiment] The fan drive circuit shown in FIG. 4 is different from the fan drive circuit shown in FIG. 3 in that a delay circuit 40 is added to the relay exciting connection line 35 and the number of fuses and The arrangement is changed, and the other structures are the same as those of the fan drive circuit of FIG. 3, and the same parts are denoted by the same reference numerals.

In FIG. 4, one fuse 29 is provided in the main wiring 23 connected to the positive electrode of the power source 25, and the first branch wiring 26 branched from the branch point P is connected to the first branch via the fan switch 20. The second branch wiring 27 is connected to the second cooling fan 12 via the relay 30.

Fan switch 20 and first cooling fan 1
1 between the branch wiring portion 26a and the coil portion 30 of the relay 30
A delay circuit 40 is provided on a connection line 35 connecting a and the coil unit 30a is energized and excited with a certain time delay after the fan switch 20 is turned on, and the switch unit 30b of the relay 30 is turned on. It has become.

FIG. 5 shows an example of the delay circuit 40.
Resistor 42, condenser 41 from the fan switch 20 side
Also, the transistor 43 is built in, and the delay time is set to, for example, about 1 second to 2 seconds.

[0027]

In FIG. 4, when the cooling water temperature is lower than the set temperature during engine operation, the fan switch 20 is off, the coil portion 30a of the relay 30 is not excited, and the switch portion of the relay 30 is not excited. 30b is also off. Therefore, both cooling fans 11 and 12 are stopped.

When the sensor portion of the fan switch 20 detects that the temperature of the cooling water exceeds the set temperature, the fan switch 20 is first turned on, and the first cooling fan 11 is activated. After the fan switch 20 is turned on, the delay circuit 40 delays the relay 3 by about 1 to 2 seconds.
0 coil portion 30a is energized and excited to switch portion 30
b is turned on and the second cooling fan 12 is started.

FIG. 6 shows the fan drive circuit of FIG. 3 and FIG.
4 is a graph showing a change in current when the fan drive circuit of FIG. 4 is operating (when the fan is started). A curve X1 indicated by a solid line is a change in current caused by the fan drive circuit of FIG. It's a change.

In the drive circuit without delay circuit shown in the curve X1 (circuit of FIG. 3), the relay 30 is turned on at the same time when the fan switch is turned on (T1), so that the total starting current of both cooling fans 11 and 12 is increased. The large current A1 (for example, about 80 amps) instantaneously flows, but the curve X
In the drive circuit with a delay circuit shown in 2 (circuit of FIG. 4), the starting current is distributed when the fan switch is on (T1) and when the relay is on (T2), so the current A2 at each on (T1, T2) is Becomes a little less than half of the current value A1 of the curve X1 (for example, about 30 amperes).

Therefore, in the fan drive circuit of FIG. 4, the trunk wiring 23 from the power supply 25 to the branch point P can be made thinner than that of FIG.
Also, it is possible to cover the two cooling fans 11 and 12 by providing only one having a small capacity.

In FIG. 4, when the sensor portion of the fan switch 20 detects that the temperature of the cooling water becomes lower than the set temperature, the fan switch 20 is turned off first, which causes the first cooling fan 11 to stop. Subsequently, the coil unit 30a of the relay 30 is delayed by a delay time by the delay circuit 40.
Is turned off and the switch unit 30b is turned off, so that the second cooling fan 12 also stops.

After the fan switch 20 is turned off, the first cooling fan 11 may rotate by inertia for a while to generate electric power. The generated electric power is absorbed by the condenser 41 of the delay circuit 40. . Therefore, as compared with the fan drive circuit that does not include the delay circuit as shown in FIG. 3, the second cooling fan 12 stops immediately after the first cooling fan 11 stops.

[Third Embodiment] FIG. 7 shows a delay circuit 40.
Is a modified example of the fan drive circuit having
6 and 27 are provided with fuses 51 and 52, respectively. In this structure, the fuses 51 and 52 are shown in FIG.
It is possible to use one having a smaller capacity than that of the above. In FIG. 7, the same parts as those in FIG. 4 are designated by the same reference numerals.

[Fourth Embodiment] FIG. 8 shows an example in which a backflow prevention circuit 60 is added to the structure of FIG. That is, in FIG. 8, the fan switch 20 and the first cooling fan 1
The backflow from the first cooling fan 11 is prevented on the wiring portion 26a between the first cooling fan 11 and the intersection P2 with the wiring 35 connected to the coil 30a of the relay 30 toward the first cooling fan 11 side. A backflow prevention circuit 60 is arranged. Other structures are the same as those in FIG. 3, and the same parts are denoted by the same reference numerals as those in FIG.

According to the structure of FIG. 8, the fan switch 20
Even if the first cooling fan 11 generates electric power by inertial rotation for a while after turning off, the backflow prevention circuit 60 prevents the current from flowing to the coil 30a of the relay 30. Therefore, even if the second cooling fan 12 does not have a delay circuit,
Stop immediately.

[0037]

[Other Embodiments of the Invention] (1) In the structure of FIG. 3, two fuses 2 are arranged on each branch wiring 26, 27.
Instead of 1, 32, the main wiring 23 may be provided with one fuse.

(2) The present invention can be applied not only to motorcycles but also to construction machines such as four-wheeled vehicles for running on uneven terrain, loaders, etc., or small generators.

(3) The radiator 6 shown in FIG. 2 has a structure in which two cooling fans 11 and 12 are arranged side by side, but it is also applicable to a radiator having various fan arrangements such as a structure in which they are arranged side by side. Is.

(4) It can also be applied to a radiator provided with three or more cooling fans. In this case, one cooling fan is provided with one fan switch, and the remaining cooling fans are respectively provided with relays to connect their coil parts to the one fan switch. Therefore,
When one fan switch is turned on, all relays are excited and turned on, and all cooling fans are started. Of course, the structure may be such that it is connected to the relay via a delay circuit.

(5) The delay circuit is not limited to the structure shown in FIG.

[0042]

As described above, according to the present invention, (1) the radiator is provided with a plurality of cooling fans, so that the radiator can be downsized and the cooling performance can be maintained for high output. Can be achieved.

(2) In a radiator having a plurality of cooling fans, one of the cooling fans is connected to a fan switch for directly turning the cooling fan on and off, and the remaining cooling fans are turned on by turning on the fan switch. By connecting a relay that energizes and turns on the corresponding cooling fan, it is possible to reduce the capacity of the fan switch while reducing it to one, thus saving parts cost and downsizing parts. You can Also, a small relay having a small capacity can be used.

(3) Further, in the structure in which a fan switch is provided for each cooling fan as in the conventional example of FIG. 11,
Due to the difference in the detected temperature of each fan switch, only one cooling fan may continue to rotate as described above, but in the present invention, all the cooling fans can always be operated simultaneously, and all the cooling fans can be operated simultaneously. Can be used efficiently.

(4) If the fan switch and the relay are connected via a delay circuit, the start of each cooling fan can be staggered in time, so that the start current for starting all the fans is instantaneously generated. It will not flow. Therefore,
The capacity of the fuse can be reduced, and the wire diameter of the main wiring connected to the power supply can be reduced, so that further miniaturization can be achieved. In particular, when applied to a motorcycle, it is not necessary to thicken the wire harness for wiring, and thus the motorcycle itself can be downsized.

(5) If the delay circuit is arranged between the fan switch and the relay, even if power is generated by cutting the fan switch and then allowing the cooling fan connected to the fan switch to rotate by inertia. By absorbing the electric power in the delay circuit, it is possible to eliminate the phenomenon that the cooling fan connected to the relay continues to rotate for a certain time due to the electric power.

(6) When a backflow prevention circuit for preventing backflow from the cooling fan is connected to the cooling fan connected to the fan switch, after the fan switch is disconnected even if the above delay circuit is not provided. Even if the cooling fan connected to the fan switch rotates by inertia to generate electric power, the current to the relay is blocked, and the cooling fan connected to the relay stops immediately after the fan switch is disconnected.

[Brief description of drawings]

FIG. 1 is a schematic left side view of a motorcycle including a radiator to which the present invention is applied.

FIG. 2 is a plan view of a radiator portion of FIG.

FIG. 3 is a fan drive circuit diagram of a fan control device according to the present invention.

FIG. 4 is a fan drive circuit diagram showing another embodiment of the fan control device according to the present invention.

FIG. 5 is a circuit diagram showing an example of a delay circuit.

FIG. 6 is a diagram showing a change in current when the fan drive circuits of FIGS. 3 and 4 are switched on.

FIG. 7 is a fan drive circuit diagram showing another embodiment of the fan control device according to the present invention.

FIG. 8 is a fan drive circuit diagram showing another embodiment of the fan control device according to the present invention.

FIG. 9 is a fan drive circuit diagram of a conventional example.

FIG. 10 is a fan drive circuit diagram of a conventional example.

FIG. 11 is a conventional fan drive circuit diagram.

[Explanation of symbols]

6 radiator 10 radiator body 11,12 Cooling fan 15, 16 fan motor 20 fan switch 23 trunk wiring 25 power supply (battery) 26, 27 branch wiring 35 connection line 40 delay circuit 21, 29, 32, 51, 2, 53 fuses 60 Backflow prevention circuit

Claims (3)

[Claims] 1. A radiator fan control device having a plurality of cooling fans, wherein a fan switch for directly turning on and off the cooling fan is connected to any one of the plurality of cooling fans, and the remaining cooling fans are connected to the above-mentioned A fan control device for a radiator, which is connected to a relay for exciting a corresponding cooling fan by turning on a fan switch to turn on a corresponding cooling fan. 2. The fan fan control device for a radiator according to claim 1, wherein the fan switch and the relay are connected via a delay circuit. 3. The radiator fan control device according to claim 1, wherein a backflow prevention circuit for preventing backflow from the cooling fan is connected to the cooling fan connected to the fan switch.