JP2555928Y2 - Radiator cooling fan controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan control device for a radiator in an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open Publication No. 63-200621
As disclosed in Japanese Patent Application Laid-Open Publication No. H11-163, the cooling water for sending cooling air toward a radiator of an internal combustion engine uses an electric cooling fan, as shown in FIG. A water temperature sensor 14 is provided in the vicinity of the outlet 13, and when the detected water temperature of the cooling water by the water temperature sensor 14 becomes equal to or higher than a predetermined value, the electric cooling fan is driven.

As shown in FIG. 4, an oil cooler 15 for cooling oil for an automatic transmission (hereinafter abbreviated as A / T) is provided in a lower tank 12 of a radiator 11, for example. 63-11
It is known as disclosed in US Pat.

[0004]

However, as described above, the oil cooler 15 is connected to the lower tank 12 of the radiator 11 as described above.
Also, when the electric cooling fan is ON / OFF controlled by the water temperature sensor 14 near the cooling water outlet 13 focusing only on the water temperature of the cooling water, the temperature of the AT oil during high-speed running is also high. Rises until it is necessary to drive the electric cooling fan to cool the radiator 11
However, since the cooling water temperature has not risen so much, the electric cooling fan remains off.

[0005] As a countermeasure to solve such a problem,
It is conceivable to increase the capacity of the oil cooler 15, but in that case, it is necessary to increase the size of the lower tank 12 of the radiator 11 or to provide a separate oil cooler, which causes a problem that the cost increases.

It is also conceivable to add an oil temperature sensor for detecting the temperature of the AT oil. However, in that case, an oil temperature sensor, a relay, and the like are required, which also raises the problem of high cost.

The present invention has been made in view of the above-mentioned conventional problems, and a low-cost radiator cooling fan in which, when the A / T oil becomes high in temperature, the electric cooling fan is driven even when the cooling water temperature is low. It is an object to provide a control device.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a cooling fan control device for a radiator provided with an electric cooling fan and having a cylindrical oil cooler having both ends opened in a lower tank. A detection unit of a water temperature sensor is provided near the outlet, and control means for driving and controlling the electric cooling fan in accordance with the temperature of the cooling water passing through the oil cooler detected by the water temperature sensor is provided.

[0009]

According to the present invention, even when the cooling water temperature at the radiator outlet is low during high-speed running or the like, when the A / T oil becomes high temperature, the cooling water passing through the inner-circumferential water passage of the oil cooler exceeds a predetermined temperature. Since the detection part of the water temperature sensor is disposed near the outlet of the cooling water passing through the inner peripheral side water passage of the oil cooler, the water temperature sensor operates to drive the electric cooling fan, and the oil cooler The A / T oil can be cooled below a predetermined temperature.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 3 showing the overall structure, reference numeral 1 denotes a radiator, a cooling water inlet 2a provided in an upper tank 2 is connected to a cooling water outlet (not shown) of a cylinder head of an internal combustion engine, and a lower tank A cooling water outlet 3a provided in the engine 3 is connected to a suction side of a water pump (not shown) of the internal combustion engine. Reference numeral 4 denotes an electric cooling fan for forcibly blowing cooling air to the radiator 1 when necessary.
The drive is controlled by the control device 5. The detection signal of the water temperature sensor 6 is input to the control device 5.

In the lower tank 2 of the radiator 1, as shown in FIGS. 1 and 2, a cylindrical oil cooler 8 having both ends open for cooling A / T oil is disposed. The oil cooler 8 is arranged so that cooling water in the lower tank 2 flows on the outer surface of the inner and outer circumferences of the cylindrical body, and the A / T oil is provided in a flow path between a number of fins 8a provided in the cylindrical body. The A / T oil is configured to be cooled by cooling water flowing in the lower tank 3 by flowing water.

A water temperature sensor 6 is provided between a cooling water outlet 3a provided at one end of the lower tank 2 and an end of the oil cooler 8 which is closer to the cooling water outlet 3a. Is located in the vicinity of the outlet of the water passage on the inner peripheral side of the oil cooler 8.

In the above configuration, when the internal combustion engine is operating, the cooling water is circulated through the radiator 1 by the water pump, and when the temperature of the cooling water exceeds a predetermined temperature, it is detected by the water temperature sensor 6 and the electric cooling fan 4 is operated. The cooling water is efficiently cooled by the radiator 1 when driven, and the cooling water is maintained at a predetermined temperature or lower. A / T oil is also cooled by a part of the cooling water flowing in the oil cooler 8. Generally, the temperature difference between cooling water and A / T oil is about 30 °
It is about C. The temperature of the cooling water used for cooling the oil cooler 8 rises by 5 to 10 ° C. However, near the cooling water outlet 3 a of the radiator 1, the cooling water is mixed with a large amount of cooling water flowing down the radiator 1 and almost mixed therewith. It will be the same temperature.

By the way, the cooling water flowing down from the radiator 1 at the time of high-speed traveling is often low in temperature so that the electric cooling fan 4 does not need to be driven. There is a case where the cooling water in a state where the cooling fan 4 is not driven merely flows into the oil cooler 8, and thus the cooling water cannot be sufficiently cooled. Even in such a state, the cooling water outlet 3a of the lower tank 3 of the radiator 1 mixes the cooling water flowing down the radiator 1 and the cooling water flowing inside the oil cooler 8 as described above. The temperature does not need to be driven. However, in this embodiment, since the detection unit 7 of the water temperature sensor 6 is disposed near the outlet of the cooling water that has passed through the inner peripheral water passage of the oil cooler 8, the water temperature sensor 6 is activated in such a state. The detection signal is output to the control device 5, and the electric cooling fan 4 is driven. As a result, the cooling water flowing down the radiator 1 is further cooled, and the oil cooler 8 is cooled by the cooling water. Can be cooled.

[0016]

According to the cooling fan control device for a radiator of the present invention, when the A / T oil becomes high temperature during high-speed traveling and the cooling water passing through the inner peripheral water passage of the oil cooler becomes higher than a predetermined temperature, Since the detection unit of the water temperature sensor is disposed near the outlet of the inner water path of the oil cooler, the water temperature sensor operates to drive the electric cooling fan, and the oil cooler cools the A / T oil to a predetermined temperature. Cooling can be performed as follows, and the arrangement of the detection unit of the conventionally provided water temperature sensor only needs to be changed.

[Brief description of the drawings]

FIG. 1 shows a water temperature sensor arrangement portion in a cooling fan control device for a radiator of the present invention, wherein FIG.
FIG. 3 is a sectional view taken along an arrow, and FIG.

FIG. 2 is an enlarged sectional view taken along the line BB of FIG. 1 (b).

FIG. 3 is an overall configuration diagram of the cooling fan control device of the embodiment.

4A and 4B show a water temperature sensor arrangement portion in a conventional radiator cooling fan control device, and FIG.
FIG. 3 is a sectional view taken along an arrow, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radiator 3 Lower tank 4 Electric cooling fan 5 Controller 6 Water temperature sensor 7 Detector 8 Oil cooler

Claims (1)

(57) [Scope of request for utility model registration] 1. An electric cooling fan having a lower tank
In a cooling fan control device of a radiator provided with a cylindrical oil cooler having both ends open , the inner peripheral water of the oil cooler is controlled.
A detection unit of a water temperature sensor is disposed near the exit of the road , and control means for driving and controlling the electric cooling fan according to the temperature of the cooling water passing through the oil cooler detected by the water temperature sensor is provided. Radiator cooling fan control device.