JP3019718B2 - Hydraulic drive 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 hydraulically driven fan mounted on, for example, an automobile and driven by hydraulic pressure to cool a radiator and the like, and more particularly to a hydraulically driven fan for controlling the rotation of the fan. The present invention relates to a fan control device.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology, those disclosed in, for example, Japanese Utility Model Laid-Open No. 2-24034 and Japanese Utility Model Laid-Open No. 2-1192931 are known.

[0003] In addition to these techniques, in general, in this type of control device, a hydraulic motor for rotating a cooling fan such as a radiator for blowing and cooling a cooled body by hydraulic pressure, and hydraulic oil to the hydraulic motor are used. A hydraulic pump driven by an engine for pumping is provided. An electromagnetic control valve for controlling the flow rate (pressure) of the hydraulic oil supplied to the hydraulic motor is provided in the middle of the pipeline connecting the hydraulic pump and the hydraulic motor.

A valve element is provided in the control valve, and the position of the valve element is adjusted based on the amount of current supplied to the valve element. The opening of the control valve is adjusted by the position adjustment, so that the pressure of the working oil supplied to the hydraulic motor is controlled.

[0005] The control current value supplied to the valve body is controlled according to various parameters such as the temperature of cooling water (cooling water temperature) flowing through a radiator or the like. For example, as shown in FIG. 7 (a), a target hydraulic oil pressure with respect to the cooling water temperature is predetermined, and as shown in FIG. 7 (b), the control current value is adjusted so as to reach the target pressure. It is determined. As shown in the figure, generally, the pressure of the hydraulic oil is set to increase as the control current value increases. And
By appropriately controlling the control current value, the pressure of the hydraulic oil supplied to the hydraulic motor is adjusted, and the rotation speed of the hydraulic motor is controlled.

[0006]

However, in the above prior art, the pressure of the working oil is set to increase as the current value increases. That is, when the current value is “0”
(A) "so that the pressure of the hydraulic oil becomes substantially" 0 ", and when the current value is maximum (for example," 0.8 (A) "), the pressure of the hydraulic oil is also maximized. The position (opening of the control valve) was adjusted. Therefore, when an abnormality such as disconnection occurs, the control current value becomes “0 (A)”, and there is a possibility that current is not supplied to the valve body. In this case, the hydraulic oil is no longer supplied to the hydraulic motor, and the cooling fan is not rotated. Therefore, there is a possibility that the object to be cooled such as the radiator and the engine will not be cooled, resulting in overheating.

The present invention has been made in view of the above circumstances, and has as its object to provide a hydraulically driven fan that controls the number of revolutions of a fan based on a current supplied to a valve body incorporated in a control valve. It is an object of the present invention to provide a hydraulic drive fan control device that can ensure the supply of hydraulic oil to a hydraulic motor even if an abnormality such as a disconnection occurs in a control device, thereby eliminating the risk of overheating. .

[0008]

According to the first aspect of the present invention, there is provided a hydraulic motor for rotating a fan for cooling an object to be cooled, and hydraulic oil supplied to the hydraulic motor. A hydraulic pump driven by an internal combustion engine for pressure feeding, and a hydraulic pump provided in the middle of a pipeline connecting the hydraulic motor and the hydraulic pump, and having its opening controlled to control the hydraulic pump A control valve for controlling the pressure of the hydraulic oil flowing into the control valve, and a position adjustment is performed based on a value of a supplied electric current, and an opening degree of the control valve is adjusted by the position adjustment. A valve body, a state detecting means for detecting at least one of a heat load state of the object to be cooled and an operating state of the internal combustion engine, based on a detection result of the state detecting means, Bei example a current value control means for controlling the value of current supplied to the Kiben body, the current value control means
The smaller the value of the current supplied to the valve body,
Pressure of hydraulic oil flowing from hydraulic pump to hydraulic motor
A hydraulically driven fan control device having an increased force , wherein the control device controls the start / stop of the internal combustion engine.
An ignition switch that is switched on and off,
The ignition switch changes from on to off
IG-off recognizing means for recognizing that switching has been performed;
The ignition switch is activated by the IG off recognition means.
When it is recognized that the state has been switched from the on state to the off state
The value of the current supplied by the current value control means is increased.
Work that flows from the hydraulic pump to the hydraulic motor
The gist of the invention is to provide a current value increasing means for reducing the hydraulic oil pressure .

[0009]

[0010]

According to the first aspect of the invention, the hydraulic pump is driven by the internal combustion engine, hydraulic oil is pumped to the hydraulic motor, and the hydraulic motor operates. The fan is rotated by the operation of the hydraulic motor, and the object to be cooled is cooled. The control valve provided in the middle of the pipeline connecting the hydraulic motor and the hydraulic pump has its opening controlled. This control controls the pressure of the hydraulic oil flowing from the hydraulic pump to the hydraulic motor. The opening degree of the control valve is adjusted by adjusting the position of the valve element incorporated in the control valve based on the value of the current supplied to the valve element.

The state detecting means detects at least one of a heat load state of the object to be cooled and an operation state of the internal combustion engine. Then, the value of the current supplied to the valve body is controlled by the current value control means based on the detection result of the state detection means.

In the present invention, the pressure of the hydraulic oil flowing from the hydraulic pump to the hydraulic motor increases as the value of the current supplied to the valve body by the current value control means decreases. Therefore, when the current value becomes “0”, the opening of the control valve becomes maximum, and accordingly, the pressure of the hydraulic oil flowing from the hydraulic pump to the hydraulic motor increases. Therefore, even when the current is not supplied to the valve body due to disconnection or the like, the hydraulic motor operates due to the increase in the hydraulic oil pressure.

[0013] In addition, Lee grayed Knitting Deployment switch is at least on-off switch to control the start and stop of the internal combustion engine. Further, the IG off recognition means recognizes that the ignition switch has been switched from the on state to the off state. When the IG-off recognizing means recognizes that the ignition switch has been switched from the on state to the off state, the current value supplied by the current value controlling means is increased by the current value increasing means. For this reason, the opening degree of the control valve is reduced, and the pressure of the hydraulic oil flowing from the hydraulic pump to the hydraulic motor is reduced.

Therefore, for example, when the driver switches the ignition switch from the ON state to the OFF state immediately after increasing the rotation speed of the internal combustion engine by racing, the rotation of the internal combustion engine stops at a high rotation speed of the fan. It is being done. However, in the present invention, since the value of the current supplied to the valve body is increased, the pressure of the hydraulic oil flowing into the hydraulic motor is reduced. Therefore, the rotation speed of the fan
With the switching of the ignition switch from the ON state to the OFF state, the power consumption is rapidly reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a hydraulic drive fan control device according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a schematic structural view showing a hydraulically driven fan control device mounted on a vehicle in this embodiment. The hydraulic drive fan control device includes a hydraulic motor 2 that drives a cooling fan 1. The cooling fan 1 is arranged opposite to the radiator 3 in order to cool the radiator 3 and the condenser 4 which are arranged in parallel one after another as a cooled object. The radiator 3 constitutes a cooling device for an internal combustion engine (engine), not shown, and circulates cooling water between the radiator 3 and the engine as is well known. The condenser 4 constitutes a refrigeration cycle of the air conditioner, and allows a high-temperature and high-pressure refrigerant gas to flow as is well known.

This control device includes a hydraulic circuit 12 comprising a tank 6, a hydraulic pump 7, a control valve 8, an oil cooler 9, a filter 10, and a pipe 11 connecting them to rotate the hydraulic motor 2. ing. The hydraulic pump 7 is drivingly connected to the engine. When the hydraulic pump 7 is driven in conjunction with the operation of the engine, the hydraulic oil sucked from the tank 6 is supplied to the hydraulic motor 2.
Is pumped to. The electromagnetic control valve 8 is provided between the hydraulic pump 7 and the hydraulic motor 2, and is used to control the opening and closing of the hydraulic oil from the hydraulic pump 7 to the hydraulic motor 2. It is supposed to be. The control valve 8 is a three-way valve, and a return oil passage 13 is provided between the control valve 8 and the hydraulic pump 7. When the opening degree of the control valve 8 is adjusted, the hydraulic oil overflowing from the control valve 8 is returned to the return oil passage 13.
Through the hydraulic pump 7.
The oil cooler 9 cools the operating oil, which has become hot by operating the hydraulic motor 2, and
Is designed to clean the hydraulic oil returning from the oil cooler 9 to the tank 6.

Next, the control valve 8 will be described in detail. As shown in FIG. 2, the housing 14 of the control valve 8 is formed with a bore 16 in which a spool valve 15 is disposed so as to be able to reciprocate, and a relief passage 17 communicating with the bore 16. In this bore 16, one end side (right side in the figure) of the spool valve 15 is a first pressure chamber 18 communicating with the discharge side of the hydraulic pump 7. The other end of the spool valve 15 (left side in the figure) is a second pressure chamber 19 communicating with the relief passage 17. The spool valve 15 moves according to the pressure difference between the two pressure chambers 18 and 19. Also, spool valve 1
5 has a built-in check valve 20, and the action of the check valve 20 allows an excessive pressure in the second pressure chamber 19 to be released. Further, the relief passage 17
Is provided with a valve body 22 whose position is controlled in accordance with the control current value I to the electromagnetic coil 21 to open and close the relief passage 17. Then, by controlling the position of the valve body 22, the differential pressure between the two pressure chambers 18, 19 is adjusted, and the spool valve 15 moves. By this movement, the first pressure chamber 1
Communication between the relief passage 8 and the relief passage 17 is controlled. By this control, the discharge side of the hydraulic pump 7 and the hydraulic motor 2
Is controlled, and the flow rate (pressure) of the hydraulic oil supplied to the hydraulic motor 2 is controlled in accordance with the pressure difference.
The rotation speed of the cooling fan 1 is controlled.

In the control device of the present embodiment, as shown in FIG. 1, the radiator 3 or the engine is provided with a cooling water temperature (cooling state) in order to detect its thermal load state (temperature state) and, consequently, the temperature state of the engine. A water temperature sensor 26 for detecting (water temperature) THW is provided. The engine is provided with a rotation speed sensor 27 for detecting the rotation speed (engine rotation speed) NE.

Further, an air conditioner (not shown) is mounted on the vehicle, and the air conditioner is provided with a pressure switch 28 for detecting a high pressure of the refrigerant. This pressure switch 28
Is turned on when the air-conditioner refrigerant pressure exceeds a predetermined level, and outputs an air-conditioner signal AS instructing this.

In addition, an ignition switch 29 is provided at the front of the vehicle. As is well known, the ignition switch 29 is connected to a battery power source (not shown), and is turned on / off by a driver's key operation. Then, from the ignition switch 29, the operation position (on / off /
An ignition signal IG corresponding to (Start) is output. In this embodiment, the water temperature sensor 2
6. A state detecting means is constituted by the rotation speed sensor 27, the pressure switch 28, the ignition switch 29 and the like.

The various detection signals are input to an electronic control unit (ECU) 31 for the engine which constitutes the current value control means, the IG off recognition means and the current value increase means. The ECU 31 includes a central processing unit (CPU), a read-only memory (ROM) in which a predetermined control program, a map, and the like are stored in advance, and a random access memory (RA) that temporarily stores calculation results of the CPU.
M), a backup R for storing pre-stored data
AM etc. are provided. The ECU 31 is configured as a logical operation circuit in which these units and input ports, output ports, and the like are connected by a bus. In addition, this E
The CU 31 can be operated by the supply current from the battery for a predetermined period after the engine is stopped.

The ECU 31 has a water temperature sensor 26,
The control valve 8 is controlled to open and close by controlling the control current value I to the valve element 22 (electromagnetic coil 21) based on signals from the rotation speed sensor 27, the ignition switch 29, and the like. That is, the ECU 31 basically refers to a predetermined map as shown in FIG. 4 in order to control the air blowing amount of the cooling fan in accordance with the temperature state of the radiator 3, and sets the target pressure PK with respect to the cooling water temperature THW. Is calculated, and the basic current value Iw is determined based on the target pressure PK as shown in FIG. In this embodiment, the basic current value Iw is set to decrease as the target pressure PK increases. In other words, as the basic current value Iw approaches “0”, the opening of the control valve 8 increases, and the pressure of the hydraulic oil supplied to the hydraulic motor 2 is set to increase.

Next, the processing operation of the rotation speed control of the cooling fan 1 executed by the above-described ECU 31 will be described with reference to FIGS.
This will be described with reference to FIG. The flowchart shown in FIG.
It shows a “valve control routine” executed when the opening of the control valve 8 is controlled to control the rotation speed of the cooling fan 1 among the processes executed by the ECU 31. Executed by a periodic interrupt.

When the process proceeds to this routine, the ECU
First, at step 101, the water temperature sensor 26
The cooling water temperature THW is read based on the detection signal from. At the same time, an ignition signal IG from the ignition switch 29 is read. The ignition signal IG is set to, for example, "0" when the ignition switch 29 is turned off, and is set to "1" when the ignition switch 29 is turned on (including a start operation).

Next, at step 102, a basic current value Iw is calculated based on the cooling water temperature THW read this time. As shown in FIG. 6, the basic current value Iw is calculated based on a map obtained by combining the two maps described above (see FIGS. 4 and 5). That is, roughly, the cooling water temperature T
The basic current value Iw is set to decrease as HW increases.

Subsequently, in step 103, it is determined whether or not the currently read ignition signal IG is "1". If the ignition signal IG is "1", the process proceeds to step 104 on the assumption that the engine rotation has not been requested to stop. In step 104, the basic current value Iw calculated this time based on the cooling water temperature THW is set as the control current value I.

In the next step 105, the control current value I is output to the valve body 22, and the subsequent processing is temporarily terminated. On the other hand, if the ignition signal IG is not "1" in step 103, a request is made to stop the rotation of the engine, and the ignition switch 2
9 is determined to have been turned off, and the process proceeds to step 106. In step 106, the engine speed NE is read based on the detection signal from the speed sensor 27.

Subsequently, in step 107, it is determined whether or not the currently read engine speed NE is larger than "0". That is, the ignition switch 29
It is determined whether or not the engine is running at all even at the moment when the engine is turned off. If the engine speed NE is larger than "0", the routine proceeds to step 108.
, A predetermined current value Iα is set as a control current value I. The predetermined current value Iα is a relatively large value, and is a value empirically determined in advance to minimize the pressure of the working oil to the hydraulic motor 2. Finally, at step 105, the control current value I
Is output to the valve body 22, and the subsequent processing is temporarily terminated. Therefore, when the engine is rotating even when the ignition switch 29 is turned off,
The control current value I does not become “0”, a current corresponding to the predetermined current value Iα is supplied to the valve body 22, and the opening of the control valve 8 becomes small. Therefore, the hydraulic motor 2 is supplied with hydraulic oil having a minimum pressure.

As described above, in this embodiment, the basic current value Iw is basically "0" in order to control the air flow of the cooling fan 1 according to the temperature state of the radiator 3.
, The opening degree of the control valve 8 increases, and the pressure of the hydraulic oil supplied to the hydraulic motor 2 is set to increase. Therefore, when the control current value I becomes “0” while the ignition switch 29 is turned on, the opening of the control valve 8 becomes maximum, and accordingly, the control valve 8 flows from the hydraulic pump 7 to the hydraulic motor 2. The operating oil pressure increases. Therefore, for example, disconnection or the like occurs and the valve body 22
Even when no current is supplied to the hydraulic motor, the hydraulic oil 2 and the cooling fan 1 operate at high speed because of the above characteristics, the pressure of the hydraulic oil increases. as a result,
Even if an abnormality such as a disconnection occurs, the engine can be reliably cooled by the rotation of the cooling fan 1 and the risk of overheating can be eliminated.

Further, in the present embodiment, when the ignition switch 29 is turned off from on and the engine is still rotating, the pressure of the hydraulic oil to the hydraulic motor 2 is minimized. Is set as the control current value I. For this reason, when the engine is rotating even when the ignition switch 29 is turned off, the control current value I does not become “0”, and a current corresponding to the predetermined current value Iα is supplied to the valve body 22, The opening of the control valve 8 is small. Therefore, the hydraulic motor 2 is supplied with hydraulic oil having a minimum pressure.

Here, for example, when the driver switches the ignition switch 29 from on to off immediately after increasing the engine speed NE by racing, the rotation of the engine stops while the speed of the cooling fan 1 is high. It is being done. Further, in the present embodiment, since the current value characteristic is used, when the control current value I is set to “0” in accordance with the OFF operation of the ignition switch 29, the opening degree of the control valve 8 becomes maximum, As a result, a limited hydraulic pressure is generated. However, in this case, in the present embodiment, the valve body 22 is maintained until the engine speed NE becomes “0”.
Since the control current value I supplied to the hydraulic motor 2 is increased, the pressure of the hydraulic oil flowing into the hydraulic motor 2 is reduced. Therefore, the rotation speed of the cooling fan 1 is rapidly reduced with the switching of the ignition switch 29 from ON to OFF. As a result, even after the engine has stopped,
There is no possibility that the cooling fan 1 continues to rotate, and it is possible to reliably prevent the generation of noise due to the high-speed rotation of the cooling fan 1.

The present invention is not limited to the above-described embodiment, and may be configured as follows, for example. (1) In the above-described embodiment, the predetermined current value Iα is always set as the control current value I when the engine is rotating even when the ignition switch 29 is turned off. Immediately after, when the ignition switch 29 is turned off, the predetermined current value Iα may be set as the control current value I only when the engine is rotating. Further, in addition to the requirement of the embodiment or the requirement described above, the requirement that the cooling water temperature THW is equal to or higher than a predetermined value may be a requirement that the predetermined current value Iα be the control current value I.

(2) In the above embodiment, the ECU for the engine which can be operated by the current supplied from the battery for a predetermined period after the engine is stopped is used as the electronic control unit.
EC for controlling the cooling fan 1 drive separately
U may be adopted so that the timer provided by itself can operate for a predetermined period after the engine is stopped.

(3) In the above-described embodiment, the characteristic is such that the hydraulic pressure decreases linearly with an increase in the current value. However, the characteristic may be such that the hydraulic pressure decreases in a curved line. (4) In the above embodiment, for convenience of explanation,
Although the configuration does not consider whether the air conditioner is operating or not, the configuration may be such that the operation of auxiliary equipment such as the air conditioner is also taken into consideration.

(5) In the above embodiment, basically, in accordance with the heat load state of the radiator 3 (cooling water temperature THW),
Although the case where the rotation speed of the cooling fan 1 is controlled has been described, the cooling fan 1 is controlled in accordance with the thermal load state of the condenser 4.
May be embodied when controlling the number of rotations. The object to be cooled is not limited to the radiator 3, the condenser 4, and the like, and other objects may be employed.

The technical idea which is not described in each claim of the claims but can be grasped from the above embodiment is described below together with its effects. (A) In the hydraulic drive fan control device according to claim 1, the state detection means includes a water temperature sensor. With the above configuration, the rotation control of the fan according to the cooling water temperature can be performed easily and in accordance with the actual situation.

(B) In the hydraulic fan control device according to claim 1 , the increase of the current value by the current value increasing means is that the ignition switch is switched from the on state to the off state by the IG off recognition means. The operation is performed continuously at least while the internal combustion engine is rotating after the recognition. With the above configuration, it is possible to increase the certainty of the effect of preventing the generation of noise due to rotation of the fan.

(C) In the hydraulic fan control device according to claim 1 , the increase in the current value by the current value increasing means is that the ignition switch is switched from the on state to the off state by the IG off recognition means. In addition to the recognition, the recognition is performed when the recognition is performed immediately after the racing. According to the above configuration, when the number of rotations of the fan is not high immediately after the switching to the off state, the current value is not increased, and the number of times the current value is increased with the switching is the minimum required. Stopped by.

[0040]

As described in detail above, according to the first aspect of the present invention, the hydraulically driven fan controls the number of revolutions of the fan based on the current supplied to the valve element incorporated in the control valve. In the control device, even if an abnormality such as a disconnection occurs, it is possible to ensure the supply of the hydraulic oil to the hydraulic motor, and thus to provide an excellent effect that the risk of overheating can be eliminated.

Further, even if the ignition switch is turned off immediately after Les pacing, the rotation of the fan can be stopped quickly, good that the generation of noise due to the rotation continues the fan can be reliably prevented with It works.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a hydraulic drive fan control device mounted on a vehicle according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating an internal structure of a control valve in one embodiment.

FIG. 3 is a flowchart illustrating a “valve control routine” executed by an ECU in one embodiment.

FIG. 4 is a map showing a relationship between a cooling water temperature and a target pressure in one embodiment.

FIG. 5 is a map showing a relationship between a current value and a target pressure in one embodiment.

FIG. 6 is a map showing a relationship of a basic current value to a cooling water temperature in one embodiment.

FIG. 7 is a graph showing a relationship between a target hydraulic oil pressure and a cooling water temperature according to the related art;
(B) is a graph showing the relationship between the target pressure and the control current value.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cooling fan, 2 ... Hydraulic motor, 3 ... Radiator as a cooled object, 4 ... Condenser as a cooled object, 7 ...
Hydraulic pump, 8 control valve, 11 pipe line, 22 valve body, 26 water temperature sensor constituting state detecting means, 27 ...
A rotational speed sensor constituting state detecting means, a pressure switch constituting state detecting means, an ignition switch constituting state detecting means, a current value controlling means, an IG off recognizing means and a current value increasing means; Constituent E
CU.

Claims (1)

(57) [Claims] 1. A hydraulic motor for rotating a fan for cooling an object to be cooled, a hydraulic pump driven by an internal combustion engine for pumping hydraulic oil to the hydraulic motor, the hydraulic motor and the hydraulic pump And a control valve for controlling the pressure of hydraulic oil flowing from the hydraulic pump to the hydraulic motor by controlling the opening of the control valve, and the control valve Built-in, the position is adjusted based on the value of the supplied current, a valve body that adjusts the opening of the control valve by the position adjustment, and at least a heat load state of the object to be cooled and an operating state of the internal combustion engine. a state detecting means for detecting one, based on said detection result of the state detecting means, e Bei a current value control means for controlling the value of current supplied to the valve body, the current value Supplied to the valve body by the control means.
The smaller the value of the current that flows, the more the hydraulic pump
As the pressure of hydraulic oil flowing into the hydraulic motor increases
A hydraulic fan control apparatus, at least in order to control the start and stop of the internal combustion engine
An ignition switch that is switched on and off, and the ignition switch is switched from an on state to an off state.
IG-off recognizing means for recognizing that the switching has been performed, and the ignition switch by the IG-off recognizing means.
Switch is recognized as switched from on to off
When the value of the current supplied by the current value control means is
Make it larger and flow from the hydraulic pump to the hydraulic motor
A hydraulic drive fan control device comprising: a current value increasing means for reducing the pressure of hydraulic oil .