JPH0988597A - Cooling fan control device for radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform control in a plurality of stages by using a plurality of water temperature sensors having the same detecting characteristics. SOLUTION: Water temperature sensors 9a and 9b having the same detecting characteristics are disposed in proper spots, different from each other, in a cooling water passage between a radiator 2 and an engine 1. A control means 10 is provided to control drive of a motor-drive cooling fan 3 in a plurality of stages according to detecting signals from the water temperature sensors 9a and 9b. This constitution disposes a plurality of the water temperature sensors 9a and 9b, having the same detecting characteristics, in the cooling water outlet 7 and a cooling water inlet 4 of the engine 1, and detects a cooling water temperature in a plurality of stages, and controls the motor-drive cooling fan 3 in a plurality of stages.

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 No. 62-1581.
As disclosed in Japanese Patent No. 23, the electric cooling fan sends cooling air to a radiator, and
It is known that the electric cooling fan is driven and controlled based on a detection signal from a water temperature sensor that detects the cooling water temperature.

As a cooling fan control device for this type of radiator, as shown in FIG. 3, by detecting the cooling water temperature in two stages and controlling the electric cooling fan in two stages, noise due to high rotation of the electric cooling fan is generated. It is known that the battery charge is reduced and the charge and discharge balance of the battery is improved.

In FIG. 3, 11 is an engine, 12 is a radiator, and 13 is an electric cooling fan that sends cooling air to the radiator 12. The high-temperature cooling water delivered from the cooling water outlet 14 of the engine 11 is supplied to the radiator 12 via the delivery pipe 15. The low-temperature cooling water cooled by the radiator 12 is returned to the cooling water inlet 1 of the engine 11 through the reflux pipe 16.
Returned to 7. Reference numeral 18 denotes a thermostat provided at the cooling water inlet 17 of the engine 11, and when the cooling water temperature is low, the cooling water discharged from the cooling water outlet 14 is supplied to the radiator 12
It is configured to open a bypass passage (not shown) that returns to the cooling water inlet 17 without passing through. 19 and 20 are predetermined temperatures (for example, 90 ° C. and 95 ° C.) where the cooling water temperatures are different from each other.
C) A water temperature sensor that outputs a detection signal when the above conditions are reached. Reference numeral 21 is a control device for driving and controlling the electric cooling fan 13, to which the detection signals of the water temperature sensors 19 and 20 are input.

The operation of the above configuration will be described with reference to FIGS. 3 and 4. When the cooling water temperature at the cooling water inlet 17 is 80 ° C. or lower, the thermostat 18 opens the bypass passage (not shown). The cooling water bypasses the radiator 12 and circulates. When the temperature of the cooling water exceeds 80 ° C., the cooling water is returned to the engine 11 through the radiator 12 cooled by traveling wind or the like. When the temperature of the cooling water at the cooling water inlet 17 exceeds 90 ° C., a detection signal is output from the water temperature sensor 19 to the control device 21, and the control device 21 drives the electric cooling fan 13 at a low speed with a power of 45 W, for example. Further, the cooling water temperature rises and the cooling water temperature rises to 95%.
When the temperature exceeds ° C, a detection signal is output from the water temperature sensor 20 to the control device 21, and the control device 21 controls the electric cooling fan 13
Is driven at a high speed with a power of 80 W, for example.

[0006]

However, in the structure of the radiator cooling fan control device as described above, since the electric cooling fan 13 is controlled in two stages by the cooling water temperature, two types of water temperatures having different detected temperatures are used. Sensors 19 and 20 are required, and water temperature sensor 19 and
There is a problem that it is necessary to distinguish the 20 types, workability is lowered, and it is also disadvantageous in terms of cost and parts management.

In view of such conventional problems, it is an object of the present invention to provide a radiator cooling fan control device capable of controlling a plurality of stages by using a plurality of water temperature sensors having the same detection characteristic. To do.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a radiator is provided with an electric cooling fan and the electric cooling fan is driven and controlled in accordance with a plurality of stages of cooling water temperatures detected by a plurality of water temperature sensors. In the fan control device, a plurality of water temperature sensors having the same detection characteristics are arranged in different places in the cooling water passage between the radiator and the engine, and the electric cooling fan is provided in multiple stages according to the detection signals from the water temperature sensors. In order to detect the cooling water temperature in multiple stages, for example, by arranging the cooling water outlet and the cooling water inlet of the engine while using a plurality of water temperature sensors having the same detection characteristics, ,
The electric cooling fan is controlled in multiple stages.

[0009]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, 1 is an engine, 2 is a radiator, and 3 is an electric cooling fan for sending cooling air to the radiator 2. The high-temperature cooling water discharged from the cooling water outlet 4 of the engine 1 is supplied to the radiator 2 via the discharge pipe 5. The low-temperature cooling water cooled by the radiator 2 is returned to the cooling water inlet 7 of the engine 1 through the return pipe 6. Reference numeral 8 is a thermostat provided at the cooling water inlet 7 of the engine 1, and when the cooling water temperature is low, the bypass passage for returning the cooling water discharged from the cooling water outlet 4 to the cooling water inlet 7 without passing through the radiator 2 ( (Not shown).

Reference numerals 9a and 9b denote water temperature sensors having the same detection characteristics, which output a detection signal when the cooling water temperature reaches a predetermined temperature (for example, 95 ° C.) or more. The cooling water inlet 7 and the cooling water outlet 4 are provided.
It is arranged in. The detection signals of the water temperature sensors 9a and 9b are used as a control device 10 for driving and controlling the electric cooling fan 3.
Has been entered.

The operation of the above configuration will be described with reference to FIGS.

The temperature of the cooling water at the cooling water inlet 7 is 80 °
In the case of C or less, the thermostat 8 opens a bypass passage (not shown), and the cooling water circulates bypassing the radiator 2. When the temperature of the cooling water exceeds 80 ° C, the cooling water passes through the radiator 2 which is cooled by traveling wind or the like and passes through the engine 1
Is returned to.

The temperature of the cooling water at the cooling water outlet 4 is 95 °
When the temperature exceeds C, a detection signal is output from the water temperature sensor 9a to the control device 10, and the control device 10 drives the electric cooling fan 3 to rotate at a low speed with a power of 45 W, for example. That is, in the steady operation state of the engine 1, the cooling water entering from the cooling water inlet 7 normally cools the engine 1 through the inside of the engine 1 and rises in temperature by about 5 ° C. while being discharged from the cooling water outlet 4. Therefore, when the cooling water temperature exceeds 95 ° C by the water temperature sensor 9a, the cooling water temperature at the cooling water inlet 7 is about 90 ° C, and therefore the cooling water temperature at the cooling water inlet 7 is about 90 ° C. When it exceeds, the electric cooling fan 3 is driven at a low rotation speed. Thus, the water temperature sensor 9a that outputs a detection signal when the temperature of the cooling water exceeds 95 ° C.
Since the cooling water temperature is 9 at the cooling water inlet 7,
When the temperature exceeds 0 ° C, the same operation as that of the water temperature sensor that outputs the detection signal is achieved.

Further, when the cooling water temperature rises and the cooling water temperature at the cooling water inlet 7 exceeds 95 ° C., a detection signal is output from the water temperature sensor 9b to the control device 10, and the control device 10 causes the electric cooling fan 3 to operate. Is driven at a high speed with a power of 80 W, for example.

As described above, according to this embodiment, a plurality of water temperature sensors 9 having the same detection characteristics are used even when performing a multi-stage control.
Since the water temperature sensors 9a and 9b are used and the arrangement positions of the water temperature sensors 9a and 9b are different, it is not necessary to distinguish the types of the water temperature sensors 9a and 9b at the time of mounting / wiring, and the workability is improved and the arrangement is made. Since the positions are different, there is no risk of miswiring of the harness, and unlike the conventional case where the connector shape is different as a countermeasure against miswiring, such a need is not required and the connector shape can be made common. It is also advantageous in terms of cost and parts management by sharing parts.

[0017]

According to the cooling fan control device for a radiator of the present invention, a plurality of water temperature sensors having the same detection characteristics are arranged at different proper positions in the cooling water passage between the radiator and the engine, and each water temperature sensor. Since the control means for driving and controlling the electric cooling fan in a plurality of stages in accordance with the detection signal from the device is provided, the cooling water temperature is detected in a plurality of stages while using the plurality of water temperature sensors having the same detection characteristic, and the electric cooling is performed. It is possible to control the fan in multiple stages, and since multiple water temperature sensors with the same detection characteristics are used and the installation positions are different, it is not necessary to distinguish the type of water temperature sensor during mounting and wiring, and workability is improved. And the location of the water temperature sensor is different, so there is no risk of incorrect wiring.
In addition, the commonality of parts is advantageous in terms of cost and parts management.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of an embodiment of a radiator cooling fan control apparatus of the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment.

FIG. 3 is an overall schematic configuration diagram of a conventional cooling fan control device for a radiator.

FIG. 4 is an operation explanatory view of the conventional example.

[Explanation of symbols]

 1 Engine 2 Radiator 3 Electric Cooling Fan 4 Cooling Water Outlet 7 Cooling Water Inlet 9a Water Temperature Sensor 9b Water Temperature Sensor 10 Control Device

Claims (1)

[Claims] 1. A radiator cooling fan control device, comprising an electric cooling fan, wherein the electric cooling fans are driven and controlled in accordance with a plurality of stages of cooling water temperatures detected by a plurality of water temperature sensors. A plurality of water temperature sensors having characteristics are arranged in different places in the cooling water passage between the radiator and the engine, and control means for driving and controlling the electric cooling fan in a plurality of stages is provided in accordance with the detection signal from each water temperature sensor. A cooling fan control device for a radiator.