JPH11158917A - Device and method for controlling cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the rotating speed of a cooling fan to be driven by a hydraulic motor or an electric motor arranged independently from an engine in response to the atmospheric temperature of the engine room of the engine and hold the temperature in the engine room substantially set temperature or lower, in a device and method for controlling the cooling fan. SOLUTION: A cooling fan 52 driven by a hydraulic motor 52a arranged independently from an engine 8 or an electric motor 52d is provided, and an atmospheric temperature sensor T(T1, T2, T3) for detecting the atmospheric temperature of the engine room ER of an engine 8 and temperature sensors T4, T5 for detecting the temperature of the medium of a cooling machine such as a radiator 40 and an oil cooler 50 are arranged. A controller CR for controlling the rotating speed of the cooling fan 52 by an output signal corresponding to temperature in which each temperature sensor T, T4, T5 detects is provided, so that the temperature of the medium is becomes substantially set temperature or lower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of detecting the number of rotations of a cooling fan driven by a hydraulic motor or an electric motor provided independently of an engine in an engine room accommodating the engine. The present invention relates to a cooling fan control device and a cooling fan control method for controlling according to an ambient temperature.

[0002]

2. Description of the Related Art As is well known, for cooling an engine and hydraulic equipment such as a construction machine, there are generally a type in which cooling air is obtained by a fan driven by a belt by an engine, and an electric motor or a hydraulic system which is independent of the engine. There is a type in which a cooling fan is driven by a motor.

In the type in which the cooling fan is driven by the electric motor or the hydraulic motor, the electric motor or the hydraulic motor for driving the fan is turned on or off according to the temperature of engine cooling water or hydraulic oil or the electric motor or the hydraulic motor. The temperature of the cooling water and the working oil is controlled within an appropriate range by changing the number of revolutions of the motor stepwise.

In any of the above types, cooling in the engine room is generally performed by sending cooling air from a cooling unit including an oil cooler and a radiator into the engine room. In general,
When the load on the engine increases, the temperature of the engine body increases, and as a result, the temperature of the engine cooling water also increases,
When the amount of heat radiation from the engine body increases and the temperature in the engine room rises, the temperature of the cooling water also rises.

Therefore, if the temperature of the cooling water is detected and controlled within an appropriate temperature range, an increase in the temperature of the engine room due to heat radiation from the engine body can be suppressed.
The engine has hot parts such as exhaust manifolds, exhaust pipes and mufflers, and even turbochargers.
Even in the engine room, there are parts where the room temperature rises locally.

[0006]

However, immediately after the start of operation of the engine or immediately after a sudden load is applied, the cooling water temperature or the hydraulic oil temperature is still low. When the load rises, the fuel supply amount is increased, and the unburned gas is discharged while burning into the exhaust system such as the exhaust manifold, the exhaust pipe, and the muffler. The temperature may rise locally and exceed an appropriate temperature level.

In such a state, since the temperature of the cooling water or the temperature of the hydraulic oil is low, the number of revolutions of the fan is kept low. For example, the amount of cooling air for cooling the engine unit and the cooling unit including an oil cooler and a radiator is reduced. Since the number is small, it is not possible to prevent the inside of the engine room from being locally heated as described above. Therefore,
It is not possible to sufficiently manage the temperature of the engine room only by controlling the speed of the cooling fan by detecting the cooling water temperature and the hydraulic oil temperature.

The present invention has been made in view of the above problems, and has a cooling fan driven by driving means such as an electric motor or a hydraulic motor provided independently of an engine. In a cooling device that also cools the inside of an engine room with cooling air from the cooling fan that cools a cooling unit such as an oil cooler or cooling air from the cooling fan dedicated to the engine, the inside of the engine room that houses the engine is provided. It is an object of the present invention to provide a cooling fan control device and a cooling fan control method for preventing an ambient temperature from becoming high by an output signal of an ambient temperature sensor for detecting the ambient temperature.

[0009]

According to a first aspect of the present invention, there is provided a cooling fan control device comprising: a cooling fan driven by a hydraulic motor or an electric motor driving means provided independently of an engine; An ambient temperature sensor that detects an ambient temperature of an engine room that houses the engine;
When an output signal corresponding to the temperature detected by the ambient temperature sensor is input, the number of rotations of the driving means of the cooling fan is controlled such that the temperature in the engine room becomes equal to or lower than the set temperature of the engine room. And a controller.

A cooling fan control device according to a second aspect of the present invention is characterized in that, in the configuration according to the first aspect, the cooling fan is a dedicated fan for cooling the engine room. According to a third aspect of the present invention, there is provided a cooling fan control device comprising: a cooling fan driven by a driving means of a hydraulic motor or an electric motor provided independently of an engine; an intercooler, an oil cooler, a radiator of the engine;
A refrigerant temperature sensor for detecting the temperature of the refrigerant of the cooler that has at least one of the coolers of the condensers of the air conditioner and that is cooled by the cooling fan, and an atmosphere in an engine room that houses the engine; By inputting an output signal corresponding to the temperature detected by each of the temperature sensors and the ambient temperature sensor for detecting the temperature, the temperature of the refrigerant of the cooler is maintained at or below the set temperature of the cooler, and A controller for controlling the number of rotations of the drive means of the cooling fan so that the temperature in the engine room is equal to or lower than the set temperature of the engine room.

According to a fourth aspect of the present invention, there is provided a cooling fan control apparatus according to the present invention, wherein a cooling fan driven by a hydraulic motor or an electric motor driving means provided independently of an engine, an intercooler, an oil cooler, and a radiator of the engine are provided. ,
A refrigerant temperature sensor that has at least one of the coolers of the condenser of the air conditioner and detects a temperature of a refrigerant of the cooler; and an ambient temperature that detects an ambient temperature of an engine room that houses the engine. When either one of the temperature detected by the sensor and the temperature detected by the two temperature sensors reaches a substantially set temperature of the refrigerant of the cooler or each of the engine rooms, an output signal corresponding to the detected temperature is input. A controller for controlling the rotation speed of the driving means of the cooling fan such that the temperature of the refrigerant of the cooler is maintained at or below a set temperature and the temperature in the engine room is at or below the set temperature. It is characterized by:

According to a fifth aspect of the present invention, there is provided a cooling fan control device according to any one of the second to fourth aspects.
A refrigerant temperature sensor for detecting the temperature of the refrigerant in the cooler,
An ambient temperature sensor disposed at a location where the room temperature locally rises in the engine room. The cooling fan control device of the present invention according to claim 6 is
6. A cooling water temperature sensor for detecting a cooling water temperature of a radiator of the engine, and a hydraulic oil temperature sensor for detecting a temperature of a hydraulic oil of a hydraulic pump driven by the engine in the configuration according to claim 3. And an ambient temperature sensor disposed in a portion of the engine room where the room temperature locally rises.

According to a seventh aspect of the present invention, there is provided a cooling fan control method according to the present invention, wherein a cooling fan driven by a driving means provided independently of an engine, and an ambient temperature for detecting an ambient temperature in an engine room of the engine are provided. A sensor for detecting the ambient temperature in the engine room with the ambient temperature sensor, outputting a detection signal in accordance with the detected ambient temperature, and setting the ambient temperature within the engine room based on the detected signal. The rotation speed of the driving means is controlled so that

According to a eighth aspect of the present invention, there is provided the cooling fan control method according to the present invention, wherein the intercooler is provided independently of the engine.
The engine is cooled by at least one of a radiator, an oil cooler, and a cooler of a condenser of an air conditioner, and cooling air that is driven by driving means disposed independently of the engine and cools the cooler. A cooling fan disposed so as to allow the engine to cool down, and an ambient temperature sensor for detecting an ambient temperature in the engine room of the engine. A detection signal is output in accordance with the temperature, and the number of revolutions of the driving means is controlled based on the detection signal so that the temperature in the engine room becomes equal to or lower than the ambient temperature.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment in which a cooling fan control device of the present invention is applied to a hydraulic shovel, and FIG. 1 is a schematic perspective view of a hydraulic shovel showing an embodiment of the present invention, FIG. 2 is a schematic explanatory view showing a plan view of FIG. 1,
FIG. 3 is a schematic sectional view showing a section taken along line 3A-3A in FIG. 2, and FIG. 4 is a view showing a modification of the embodiment of the present invention.
FIG. 3 is a schematic plan view showing a state similar to FIG. 2.

As shown in FIG. 1, the basic structure of the hydraulic shovel is composed of three parts: an upper swing body 2, a lower traveling body 4 that supports the upper swing body 2 so as to be able to swing, and a working device 6 that performs various operations. It is configured. The upper revolving unit 2 includes an engine 8, a hydraulic device (not shown), a revolving unit 12, an operator room 15, and the like. The lower traveling unit 4 includes a car body 16, a track roller frame 18, and a traveling unit 20.
The working device 6 includes a boom 24 and an arm 25 for supporting the bucket 22, and actuators including various hydraulic cylinders, link rods, and the like for operating the boom 24 and the arm 25. I have.

A hydraulic device for operating actuators such as the working device 6, the traveling device 20, and the turning device 12 is provided. As shown in FIGS. 1 and 2, an engine 8 as a prime mover, a hydraulic pump 26 driven by the engine 8, and a pressure discharged from the hydraulic pump 26 are provided on the upper swing body 2 of the hydraulic shovel. An actuator driven by oil, for example, a boom cylinder 24a for rotating the boom 24 shown in FIG.
Control valve 70 for controlling the flow of hydraulic oil supplied from hydraulic pump 26 to an actuator such as boom cylinder 24a, hydraulic piping (not shown) for connecting control valve 70 to boom cylinder 24a, and supplying fuel to engine 8 Fuel tank 31 and hydraulic pump 2
A hydraulic oil tank 30 for accumulating hydraulic oil supplied to 6;
A hydraulic pipe 76 connecting the hydraulic oil tank 30 and the hydraulic pump 26; a hydraulic pump 26 and a control valve 7;
0, a delivery pipe 78 for connecting the control valve 70 and the oil cooler 50, and an operator room 15.

The hydraulic oil discharged from the hydraulic pump 26 driven by the engine 8, which is appropriately determined according to design specifications and has a high pressure of, for example, about 140 to 300 kg / cm ² , is controlled by the control valve 70. The oil is controlled and transmitted to the above-mentioned devices to perform various operations to produce low-pressure oil. The oil returns to the hydraulic oil tank 30 via the control valve 70 again, and is circulated by the hydraulic pump 26 again.

As shown in FIG. 1, the hydraulic excavator is installed vertically along the front and rear direction of the upper swing body 2 or horizontally installed along the vehicle width direction of the upper swing body 2. To
An engine room ER for accommodating the mounted engine 8 is provided. In the case of the present embodiment, an engine room ER is provided along the counterweight 27 and cooperates with a partition wall KW that partitions between the engine 8 and the control valve 70. The engine 8 is disposed horizontally in the engine room ER configured as described above.

In the engine room ER, the side facing the cooling air intake 46 in front of the engine 8 is open to the outside, and the engine 8 and the hydraulic pump 26 are partitioned by the firewall FW. It is configured. Further, as shown in FIG. 4, the partition KW includes a front partition KWa, a center partition KWb, and a rear partition KW.
Although it is constituted by Wc, it may be constituted only by the central partition wall KWb.

The engine room ER may include a partition wall KWb on the center side, a counterweight 27, a front partition wall KWF connecting the central partition wall KWb and the counterweight 27, and a firewall FW. .
Further, the engine room ER may be a simple partition wall that separates the engine 8 from various other hydraulic devices or the like, or may be a partition wall surrounding the engine 8 for blocking noise of the engine 8. Alternatively, a firewall FW that separates the hydraulic pump 26 from the engine 8 and surrounds the periphery of the engine 8 may be used, or a so-called enclosure that surrounds the periphery of the engine 8 or the engine 8 and the hydraulic pump 26 may be used.

As shown in FIG. 2, an intercooler I is provided in front of a cooling fan 52 provided on the front side of the engine 8.
C, at least one of the oil cooler 50 and the radiator 40 is provided. In the present embodiment shown in FIG. 2, the oil cooler 50 and the radiator 40 are provided, and are independent of the engine 8 for cooling these. A cooling fan 52 (also referred to as a first cooling fan) driven by driving means 51 such as a hydraulic motor 52a or an electric motor 52d is provided.

The cooling device, the first cooling fan 52 and the driving means 51 for the cooling device need not necessarily be provided in the engine room ER. In short, the cooling air for cooling the cooling device cools the engine 8. What is necessary is just to be comprised. When the above intercooler IC is provided,
Although it can be disposed in front of the engine room ER in front of the engine 8 shown by a two-dot chain line in FIG. 2, the disposition position is not limited to the above-mentioned position. It may be arranged substantially horizontally, or may be arranged behind the engine 8 or the hydraulic pump 26.

An air cleaner AC is disposed above the engine 8 as shown in FIG.
Is connected to a turbocharger 102 via an air pipe 100. Also, as shown in FIGS. 1 and 2, the engine 8 in the engine room ER provided on the upper-part
Turbocharger 10, which is a supercharger disposed on the upper side of the
The air supercharged in 2 is from the turbocharger 102
It is connected to an intercooler IC via an air pipe connected to an air outlet (not shown).

As shown in FIG. 2, the hydraulic motor 52a, which is the driving means 51 for the first cooling fan 52, is connected to the hydraulic pump 26 driven by the engine 8 by the hydraulic pipe 26a.
The first cooling fan 52 is mounted on the output shaft of the hydraulic motor 52a. Since the present embodiment is configured as described above, when the engine 8 is operated as shown in FIGS. 1 to 3, cooling air is taken into the engine room ER by the first cooling fan 52 as shown by an arrow Y. 46, the oil cooler 50, the radiator 4
After cooling the engine hood 0, the engine 8 and the like are further cooled, and the engine hood E above the engine 8 behind the engine room ER.
The upper discharge port 47a shown in FIG.
Or it is discharged from the lower discharge port 47b or the like,
The position of the outlet is not limited to the above position,
It may be provided at an appropriate portion on the outer peripheral side of the upper swing body 2.

Further, in the case where the engine room ER is an enclosure for soundproofing the engine 8, for example, in the case of an enclosure surrounding the entire circumference of the engine 8 (for example, six surfaces of the engine) or in the case of a firewall, the entire circumference of the engine 8 is as small as possible. , It is possible to effectively cool the engine room ER while shutting out noise of the engine 8 and the like as much as possible.

A control device S1 for controlling the number of revolutions of the hydraulic motor controlled by the controller CR is provided in a hydraulic circuit including the hydraulic pipe 26a and the like, and an atmosphere temperature provided in a locally high temperature portion in the engine room ER. An output signal corresponding to the temperature detected by the sensor T (such as temperature sensors T1 to T3 to be described later) is input to the controller CR, and the first cooling fan 52 is operated in accordance with the output signal. , Oil cooler 50 at the time of starting, etc., radiator 40
However, even when the temperature is still low, it is possible to control the rotation of the first cooling fan 52 so that the temperature of the engine room ER can be maintained within a substantially set temperature value, and it is possible to reduce noise accurately and efficiently. It can be cooled while suppressing it.

In the engine room ER, the part where the temperature becomes locally high is, for example, the turbocharger 102.
Temperature sensor T1 for detecting the temperature of the exhaust gas, exhaust gas temperature sensor T2 for detecting the temperature of the exhaust system of the exhaust manifold EM and the muffler, and the temperature of the cooling air at which the temperature rises after staying near the firewall FW on the rear side of the engine room. Is detected by the firewall temperature sensor T3 or the like.

The oil cooler 50 and the radiator 40 are provided with a cooling water temperature sensor T5 for detecting the temperature of the cooling water and a hydraulic oil temperature sensor T4 for detecting the temperature of the hydraulic oil. , T5, an output signal corresponding to the temperature detected is input to the controller CR, and the cooling air of the first cooling fan 52 driven by the hydraulic motor 52a controlled by the control device S1 causes the oil cooler 50, the radiator 40, and the like to operate. The coolant of the cooling water and the working oil is maintained at a substantially set temperature.

The temperature of the refrigerant in each of the above-described coolers and the temperature of the engine room ER are maintained at least at a temperature close to the set temperature. Further, for example, although not shown, when the hydraulic motor 52a is a constant displacement hydraulic motor, the control device S1 may be configured by a flow control valve provided in the hydraulic circuit OP, or may be an axial drive that is a variable displacement hydraulic motor. In the case of a piston type swash plate type hydraulic motor, the swash plate is constituted by a variable capacity mechanism of the swash plate for controlling the rotation speed of the hydraulic motor by changing the angle of the swash plate of the hydraulic motor.

In the above embodiment, the first cooling fan 5
Although the case where the hydraulic motor 52a is applied as the second driving means 51 has been described, the invention is not limited to this.
As shown by a two-dot chain line in FIG. 2, for example, instead of the above-described hydraulic motor 52a, the output of an electric motor 52d that operates by being supplied with power from a power supply SK driven by the engine 8 via an electric circuit EP. On the shaft, the first cooling fan 5
2 may be connected.

In the case of the above-described electric motor 52d, for example, as shown in FIG. 2, the electric circuit EP is provided with a control device S2 for controlling current, electric resistance and the like.
If the amount of current to 2d is controlled, similarly to the case of the hydraulic motor 52a, each of the temperature sensors T1 to T5 is controlled.
The rotation speed of the electric motor 52d is controlled in accordance with the temperature detected by at least one of the temperature sensors described above, so that the same operational effects as those of the hydraulic motor 52a can be obtained.

The above-mentioned control devices S1 and S2 are provided for controlling the ambient temperature T or the temperature of a portion of the engine room ER where the temperature is particularly high, such as a portion of the cooling water chamber near the exhaust port of the engine. For example, one or a plurality of the temperature sensors T1 in the present embodiment.
To T3, and, in the case of an engine, a temperature sensor T5 for detecting a cooling water temperature and a hydraulic oil discharged and circulated from a hydraulic pump 26 driven by the engine 8 in the case of an engine. The temperature is detected by a hydraulic oil temperature sensor T4, and an output signal corresponding to the detected temperature is input to the controller CR.

The controller CR cools at a rotational speed determined by a map obtained from an input temperature signal of each part, a pre-programmed relational expression (table) of the temperature of each part and the rotational speed of the fan. The cooling fan drive circuit is controlled so that the fan 52 rotates. Therefore, if the temperature in the engine room ER is high even if the temperature of the cooling water or hydraulic oil is low, the cooling fan 52 rotates at a high speed in accordance with the temperature, and is required to cool the high-temperature portion in the engine room ER. A large amount of cooling air can be supplied.

Therefore, as described above, when the temperature of the cooling water or hydraulic oil becomes high, the rotation speed of the cooling fan 52 is controlled in accordance with the detected temperature and maintained in the appropriate temperature range as before. Needless to say. As a result, the inside of the engine room ER is prevented from being at an abnormally high temperature, and the components constituting the engine 8 and the engine room ER are exposed to a high temperature that is substantially equal to or higher than the set temperature, resulting in damage, burnout, or a shortened life. There is no fear.

Further, an intercooler IC, an oil cooler 5
If a condenser for an air conditioner having a relatively low temperature is arranged in front of the radiator 40 and the cooling is performed by the first cooling fan 52 together with the intercooler IC, substantially the same operation and effect as in the above embodiment can be achieved. Next, a modified example of the embodiment shown in FIG. 2 will be described with reference to FIG. 4. However, substantially the same portions as those in the above-described embodiment will be denoted by the same reference numerals and different points will be described.

In the above embodiment, the oil cooler 50 and the radiator 4 are provided in front of the engine 8 in the engine room ER.
However, in the present modification, the oil cooler 50 and the radiator 40 are separately provided from the engine 8, and a cooling fan (first cooling fan) 52 for cooling the engine room is provided. The above-described ambient temperature sensor T for controlling the first cooling fan 52 is mounted in the engine room ER.

Accordingly, since the control of the first cooling fan 52 dedicated to cooling the engine room ER is configured in the same manner as in the above-described embodiment, it is possible to achieve substantially the same operation and effect as in the above-described embodiment. In the case of the above modification, as shown in FIG. 4, the oil cooler 50, the radiator 40, the second cooling fan 53,
A hydraulic motor 52a driven by the hydraulic pump 26, which is a driving unit 501 of the second cooling fan 53, is provided.

Then, as shown in FIG. 4, the hydraulic circuit OP, the control device S1, the controller C
R is provided, and an output signal corresponding to each temperature detected by the hydraulic oil temperature sensor T4 and the cooling water temperature sensor T5 is input to the controller CR, so that the oil cooler 50,
Since the radiator 40 is effectively cooled, substantially the same functions and effects as those of the above embodiment can be obtained.

In place of the hydraulic motor 52a, as shown in FIG.
d, when the electric circuit EP, the control device S2, the power supply SK, etc. are provided, output signals corresponding to the respective temperatures detected by the hydraulic oil temperature sensor T4 and the cooling water temperature sensor T5 are input to the controller CR. By doing, the oil cooler 5
0, since the radiator 40 can be effectively cooled, it is possible to obtain substantially the same operation and effect as the above embodiment.

In the above embodiment, the case where the intercooler uses the air-cooled intercooler IC has been described. However, the radiator for the water-cooled intercooler is disposed at the position where the air-cooled intercooler IC is disposed, and is driven by the engine 8 (not shown). The cooling water from the water pump is supplied to the water-cooled intercooler I described above.
C. The cooling water cooled in C is supplied to the intercooler core, thereby cooling the supercharged air from the turbocharger, and
Even if it is supplied to the intake manifold described above, substantially the same operation and effect as described above can be obtained. .

[0042]

As described above in detail, according to the cooling fan control apparatus of the present invention, the cooling fan driven by the hydraulic motor or the electric motor driving means provided independently of the engine. And an ambient temperature sensor for detecting the ambient temperature of the engine room that houses the engine, and an output signal corresponding to the temperature detected by the ambient temperature sensor is input, so that the temperature in the engine room is reduced to the engine room. And a controller for controlling the rotation speed of the driving means of the cooling fan so as to be equal to or lower than the set temperature of the cooling fan. The engine room is controlled and rotated to supply necessary cooling air to the engine room. It is possible to prevent the.

Accordingly, there is no danger that the components constituting the engine and the engine room are exposed to high temperatures, resulting in destruction, burning, or a reduction in the service life of the components. According to the cooling fan control device of the present invention, since the cooling fan is a dedicated fan for cooling the engine room, the atmosphere detected by the ambient temperature sensor in the engine room is provided. With the output signal corresponding to the temperature, the cooling fan is controlled and rotated, and the required fresh air is quickly supplied to the engine room, thereby preventing the inside of the engine room from becoming abnormally high. it can.

Therefore, there is no danger that the above-mentioned components of the engine and the engine room are exposed to high temperatures, which may lead to destruction, burning or shortening of the service life. According to the cooling fan control device of the present invention, the cooling fan driven by the driving means of the hydraulic motor or the electric motor provided independently of the engine, and the intercooler, oil cooler, radiator, A refrigerant temperature sensor having at least one of the coolers of the condenser of the air conditioner and detecting a temperature of a refrigerant of the cooler cooled by the cooling fan; and an atmosphere in an engine room accommodating the engine. An atmosphere temperature sensor for detecting a temperature, and an output signal corresponding to the temperature detected by each of the temperature sensors are input, whereby the temperature of the refrigerant of the cooler is maintained at or below the set temperature of the cooler, and The number of rotations of the driving means of the cooling fan so that the temperature in the engine room becomes equal to or lower than the set temperature of the engine room. And a controller that controls the rotation speed of the cooling fan, including the ambient temperature of the engine room in addition to the temperature of the refrigerant of the cooler, even if the temperature of the refrigerant of the cooler is low. If the temperature in the engine room is high, the cooling fan can be controlled and rotated in accordance with the ambient temperature to supply a cooling air amount necessary for cooling a high-temperature portion of the engine room.

Therefore, there is no danger that the above-mentioned components of the engine and the engine room will be exposed to a high temperature, resulting in destruction, burning and shortening of the service life. According to the cooling fan control device of the present invention, the cooling fan driven by the driving means of the hydraulic motor or the electric motor provided independently of the engine, the intercooler, the oil cooler, the radiator, A refrigerant temperature sensor that has at least one of the coolers of the condenser of the air conditioner and detects a temperature of a refrigerant of the cooler; and an ambient temperature that detects an ambient temperature of an engine room that houses the engine. When any one of the temperature detected by the sensor and each of the temperature sensors reaches a substantially set temperature of the refrigerant of the cooler or each of the engine rooms, an output signal corresponding to the detected temperature is input. As a result, the temperature of the refrigerant in the cooler is maintained at or below the set temperature, and the temperature in the engine room is maintained at or below the set temperature. And a controller for controlling the number of rotations of the driving means of the cooling fan so that a signal corresponding to the temperature detected by any one of the temperature sensors is input to the controller. Since the cooling fan is operated in response to the temperature signal, the engine, the hydraulic pump, the intercooler, the oil cooler, the radiator and the like can be cooled accurately and efficiently while suppressing noise.

According to a fifth aspect of the present invention, in the cooling fan control device according to the second aspect of the present invention, the refrigerant temperature sensor for detecting the temperature of the refrigerant of the cooling machine and the engine are provided. Since there is an ambient temperature sensor disposed at a location where the room temperature is locally high in the room, even if the temperature of the refrigerant in the cooler is low, if the temperature in the engine room is high, the cooling fan is It can be controlled and rotated according to the ambient temperature to quickly supply the amount of cooling air required for cooling the high-temperature part of the engine room, and the above-mentioned engine and each part constituting the engine room are exposed to high temperatures. Therefore, there is no danger of destruction, burning or shortening of the service life.

According to a sixth aspect of the present invention, in the cooling fan control device according to the third aspect, the cooling water temperature sensor detects the temperature of the cooling water of the radiator of the engine. And a hydraulic oil temperature sensor for detecting the temperature of hydraulic oil of a hydraulic pump driven by the engine, and an ambient temperature sensor disposed at a location in the engine room where the room temperature is locally high. Even if the temperature of the water and hydraulic oil is low, if the temperature in the engine room is high, the cooling fan is controlled and rotated according to the ambient temperature, and the amount of cooling air required for cooling the high temperature part of the engine room. And the components constituting the engine and the engine room are not exposed to high temperatures, and there is no danger of causing destruction, burning or shortening of the service life.

According to the cooling fan control method of the present invention, the cooling fan driven by the driving means provided independently of the engine and the ambient temperature in the engine room of the engine are detected. An ambient temperature sensor, detects an ambient temperature in the engine room with the ambient temperature sensor, outputs a detection signal in accordance with the detected ambient temperature, and sets a set atmosphere in the engine room based on the detected signal. Since the rotation speed of the driving means is controlled to be equal to or lower than the temperature, by detecting the ambient temperature in the engine room and controlling the rotation speed of the cooling fan, the temperature in the engine room becomes high. Can be prevented.

According to the cooling fan control method of the present invention, at least one of an intercooler, a radiator, an oil cooler, and a condenser cooler of an air conditioner, which is disposed independently of the engine, is provided. A cooling fan that is driven by driving means disposed independently of the engine to cool the engine with cooling air after cooling the cooler, and an ambient temperature in the engine room of the engine. An ambient temperature sensor that detects an ambient temperature in the engine room with the ambient temperature sensor, and outputs a detection signal in accordance with the detected ambient temperature. The rotation speed of the driving means is controlled so that the temperature is equal to or lower than the ambient temperature. Be, the higher the temperature in the engine room, can be the cooling fan is rotated at a high speed in response to the ambient temperature, quickly supply cooling air quantity required for cooling the hot parts of the engine room.

Therefore, there is no danger that the components constituting the engine and the engine room will be exposed to a high temperature, resulting in destruction, burning or shortening of the service life.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a schematic perspective view showing a case where a cooling fan control device of the present invention is applied to a hydraulic shovel.

FIG. 2 is a schematic explanatory view showing a plan view of FIG. 1;

FIG. 3 is a schematic explanatory view showing a cross section taken along line 3A-3A in FIG. 2;

FIG. 4 is a schematic explanatory view showing a modified example of the embodiment of the present invention, showing a state similar to FIG. 2;

[Explanation of symbols]

 2 Upper revolving unit 4 Lower traveling unit 6 Working device 8 Engine 12 Revolving device 15 Operator room 16 Car body 18 Track roller frame 20 Traveling device 22 Bucket 24 Boom 26 Hydraulic pump 26a Hydraulic piping 30 Hydraulic oil tank 31 Fuel tank 33 Storage box 40 Radiator 46 Cooling air inlet 50 Oil cooler 51 First cooling fan driving means 501 Second cooling fan driving means 52 Cooling fan (first cooling fan) 52a Hydraulic motor 52d Electric motor 53 Second cooling fan 102 Supercharger (Turbocharger) AC Air cleaner CR controller EP Electric circuit ER Engine room IC Intercooler KW Partition wall KWF Front partition OP Hydraulic circuit S1, S2 Control device SK Feeder T Atmospheric temperature sensor

Claims (8)

[Claims] A cooling fan driven by a driving means of a hydraulic motor or an electric motor provided independently of an engine; an ambient temperature sensor for detecting an ambient temperature of an engine room accommodating the engine; An output signal corresponding to the temperature detected by the sensor is input, and a controller that controls the rotation speed of the driving means of the cooling fan so that the temperature in the engine room is equal to or lower than the set temperature of the engine room. A cooling fan control device, comprising: 2. The cooling fan control device according to claim 1, wherein the cooling fan is a dedicated fan for cooling the engine room. 3. A cooling fan driven by a driving means of a hydraulic motor or an electric motor provided independently of the engine, and at least one of an intercooler, an oil cooler, a radiator, and a condenser of an air conditioner of the engine. A refrigerant temperature sensor for detecting the temperature of the refrigerant of the cooler having one of the coolers and cooling with the cooling fan; an ambient temperature sensor for detecting an ambient temperature of an engine room accommodating the engine; By inputting an output signal corresponding to the temperature detected by the temperature sensor, the temperature of the refrigerant of the cooler is maintained at or below the set temperature of the cooler, and the temperature in the engine room is set to the set temperature of the engine room. A controller for controlling the rotation speed of the driving means of the cooling fan as described below. The cooling fan control device. 4. A cooling fan driven by a hydraulic motor or an electric motor driving means provided independently of the engine, and at least one of an intercooler, an oil cooler, a radiator, and a condenser of an air conditioner of the engine. A refrigerant temperature sensor that has any one of the coolers and detects the temperature of the refrigerant of the cooler, an ambient temperature sensor that detects the ambient temperature of an engine room that houses the engine, and a temperature that is detected by the two temperature sensors When any one of the refrigerants reaches the approximate set temperature of the refrigerant of the cooler or each of the engine rooms, by inputting an output signal corresponding to the detected temperature, the temperature of the refrigerant of the cooler is changed. The driving fan of the cooling fan is maintained at a temperature equal to or lower than the set temperature and the temperature in the engine room becomes equal to or lower than the set temperature. A controller for controlling the number of rotations of a stage, the cooling fan control device comprising: 5. A refrigerant temperature sensor for detecting a temperature of a refrigerant of the cooler, and an ambient temperature sensor disposed in a part of the engine room where a room temperature is locally increased. The cooling fan control device according to any one of claims 2 to 4. 6. A cooling water temperature sensor for detecting a cooling water temperature of a radiator of the engine, a hydraulic oil temperature sensor for detecting a temperature of hydraulic oil of a hydraulic pump driven by the engine, and The cooling fan control device according to any one of claims 3 to 5, further comprising an ambient temperature sensor disposed at a portion where the room temperature becomes high. 7. A cooling fan driven by driving means provided independently of the engine, and an ambient temperature sensor for detecting an ambient temperature in an engine room of the engine, wherein the ambient temperature sensor detects the ambient temperature of the engine. An ambient temperature in the room is detected, a detection signal is output in accordance with the detected ambient temperature, and a rotation speed of the driving unit is controlled based on the detected signal so as to be equal to or lower than a set ambient temperature in the engine room. A cooling fan control method. 8. Driving is performed by at least one of an intercooler, a radiator, an oil cooler, and a condenser cooler of an air conditioner provided independently of the engine, and a driving means provided independently of the engine. A cooling fan arranged to cool the engine with cooling air after cooling the cooler; and an atmosphere temperature sensor for detecting an atmosphere temperature in an engine room of the engine. Detecting an ambient temperature in the engine room, outputting a detection signal in accordance with the detected ambient temperature, and rotating the driving means so that the temperature in the engine room becomes equal to or lower than the ambient temperature based on the detected signal. A method for controlling a cooling fan, characterized in that the number is controlled.