JP4330431B2 - Cooling fan control system - Google Patents

Description

  The present invention relates to a cooling fan control system for controlling the rotational speed of a cooling fan mounted on a work vehicle such as a wheel loader or a snowplow.

  In general, a work vehicle such as a wheel loader travels at a low speed (for example, 35 km / h), and often causes traffic congestion. Therefore, conventionally, it has been desired to increase the speed of work vehicles (for example, 50 km / h) and to improve acceleration performance (see, for example, Patent Document 1 for improving acceleration performance).

It is possible to cope with this by mounting the engine with a larger horsepower than before with the same vehicle body of the work vehicle. However, with this method, the speed of the work vehicle can be increased. However, since the cooling fan is directly connected to the engine, it is rotated at a high speed during acceleration and consumes more power than necessary, so that the acceleration performance is not sufficiently improved.
JP 2002-315105 A (page 2-3)

  The present invention has been made to solve the above problem, and an object thereof is to provide a cooling fan control system capable of improving the acceleration performance of a work vehicle.

To achieve the above object, the present invention provides a cooling fan control system for controlling the rotational speed of the cooling fan to be mounted on a work vehicle, a hydraulic motor that drive the above cooling fan, oil pressure motor to which are connected via a hydraulic circuit, a hydraulic pump that will be driven by the engine, provided in the hydraulic circuit, the oil amount adjusting device for adjusting the amount of oil delivered to the hydraulic motor, for the work Acceleration state detection device for detecting acceleration information relating to the acceleration state of the vehicle, and detection of travel information comprising at least one of the position of the hoist arm, the angle of the bucket and the position of the work implement operating lever of the work vehicle a running state detecting device for a working vehicle based on the travel information detected by the running state detecting device determines whether a traveling state or a working state, and the acceleration state detection Working vehicle based on the detected acceleration information device determines whether a non-accelerating state or an acceleration state, and a control unit for controlling the oil amount adjusting device based on their judgment result, the the control device controls the oil amount adjusting device as above Symbol cooling fan is slowed or stopped when it is determined that the working vehicle is in and accelerating state in the traveling state.

Also, another of the present invention and the invention is a cooling fan control system for controlling the driving of the cooling fan to be mounted on a work vehicle, a hydraulic motor that drive the above cooling fan, oil pressure A variable speed hydraulic pump driven by an engine configured to be able to change the amount of oil supplied to the motor, and an acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle A travel state detection device that detects travel information including at least one of a position of a hoist arm, a bucket angle, and a position of a work implement operation lever of the work vehicle, and the travel state detection device working vehicle based on the travel information to determine whether the traveling state or a working state, and the work vehicle based on the acceleration information detected by the acceleration state detecting device acceleration shape Determining whether the non-accelerated state or is on the basis of their judgment result and a control unit for controlling the oil amount adjusting device, the control device, the work vehicle is in and accelerating condition in the running state upper Symbol cooling fan when it is determined that controls the variable speed hydraulic pump as slow or stop.

In these configurations, by slowing or stopping the cooling fan during acceleration, thereby suppressing the power of the cooling fan. Thus, the load of the oil pressure pump is reduced, the partial number of engine power and it is possible to use the acceleration of the work vehicle. As a result, the acceleration performance of the work vehicle can be improved. Here, the “accelerated state” includes not only the case where the work vehicle accelerates while traveling but also the case where the vehicle is accelerated when starting.

Further, when the working vehicle is not in a traveling state, that is, when the engine is in a high load state such as in a working state, the engine is overheated when the cooling fan is decelerated or stopped according to the acceleration state of the working vehicle. There is a case. To cope with this, in the present invention, by providing the traveling state detecting device in addition to the acceleration state detecting device, it is the this to improve the limited to acceleration performance when working vehicle is in the "running state" I am doing so. The “traveling state” refers to a case where the working vehicle travels mainly on a general road and is not in a working state.

The running condition detecting device, the position of the hoist arm of the working vehicle, Ru is configured to detect at least one of the position angle and the working machine operating lever of the bucket. These parameters all indicate the traveling state of the work vehicle. By using these parameters, it can be easily determined whether or not the work vehicle is in a traveling state. As a result, the cooling fan can be reliably decelerated or stopped when the work vehicle is in the traveling state. Thereby, the acceleration performance of the work vehicle can be improved when the work vehicle is in a traveling state . Contact name, the "working machine operating lever" working working machine mounted on a vehicle, for example, a lever for operating the hoist arm, bucket and the like.

In particular, the oil amount adjusting device is preferably an electromagnetic switching valve or an electromagnetic switching relief valve. In this configuration, by switching the electromagnetic switching valve or an electromagnetic change-over relief valve, to shut off or communicate the oil fed to the oil pressure motor. Thereby, the cooling fan is operated or stopped. More specifically, during the cooling fan operation oil is fed to the oil pressure pump or al oil pressure motor. During the cooling fan stop it is returned to the oil tank without oil fed to the oil pressure pump or al oil pressure motor. Thus, the load of the oil pressure pump is reduced, the partial number of engine power and it is possible to use the acceleration of the work vehicle. As a result, the acceleration performance of the work vehicle can be improved. Further, the electromagnetic switching valve or the electromagnetic switching relief valve may be electromagnetic proportional control instead of the ON / OFF control. Thus, it is possible to decelerate the cooling fan to a desired rotational speed by adjusting the amount of oil fed to the oil pressure motor. Again, oil is not fed to either et oil pressure motor hydraulic pump is returned to the oil tank. Thus, the load of the oil pressure pump is reduced, the partial number of engine power and it is possible to use the acceleration of the work vehicle. The switching valve or the switching relief valve is not limited to an electromagnetic type, and may be a pilot pressure type, for example.

The control device is configured such that the position of the hoist arm is in a predetermined height range, the height position of the hoist arm is in a predetermined height range, and the position of the work implement operating lever is in a neutral position, When at least one of the bucket angle is within a predetermined range and the bucket angle is within the predetermined range and the operation lever is in a neutral position, the work vehicle is in a traveling state. You may make it judge that it is.

Another aspect of the present invention, different from the above invention, is a cooling fan control system that controls the rotational speed of a cooling fan mounted on a work vehicle, the hydraulic motor driving the cooling fan, and a hydraulic pressure applied to the hydraulic motor. A hydraulic pump connected by an engine and driven by an engine; an oil amount adjusting device provided in the hydraulic circuit for adjusting the amount of oil supplied to the hydraulic motor; and acceleration of the working vehicle An acceleration state detection device for detecting acceleration information relating to the state, a changeover switch for switching the operation mode of the work vehicle to a work mode and a travel mode, and when the changeover switch is switched to the travel mode, and the acceleration The cooling fan according to the acceleration state of the work vehicle when it is determined that the work vehicle is in an acceleration state based on the acceleration information obtained from the state detection device. A control device configured to control the oil amount adjusting device so as to be decelerated or stopped, and not to decelerate or stop the cooling fan according to the acceleration state of the work vehicle when the changeover switch is switched to the work mode; Is provided.

Further, the present invention, which is different from the above invention, is a cooling fan control system for controlling driving of a cooling fan mounted on a work vehicle, the hydraulic motor driving the cooling fan, and feeding to the hydraulic motor A variable speed hydraulic pump driven by an engine, configured to change the amount of oil to be performed, an acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle, and the work A changeover switch for switching the operation mode of the work vehicle to the work mode and the travel mode, and the work vehicle is accelerated when the changeover switch is switched to the travel mode and based on the acceleration information obtained from the acceleration state detection device. The variable speed hydraulic pump is controlled so that the cooling fan is decelerated or stopped according to the acceleration state of the work vehicle when it is determined that Gyoshi, when said selector switch is switched to the working mode and a controller configured not to slow or stop the cooling fan in accordance with the acceleration state of the work vehicle.

With these configurations , as described above, the acceleration performance of the work vehicle can be improved only when the work vehicle is in a traveling state.

  Preferably, the acceleration state detection device is configured to detect at least one of an accelerator pedal angle of the work vehicle, the number of shift stages, an engine fuel injection control amount, and an output rotation speed of the engine or transmission.

  These parameters all indicate the acceleration state of the work vehicle. Therefore, using these parameters, it is possible to easily determine whether or not the work vehicle is in an accelerated state. As a result, the cooling fan can be reliably decelerated or stopped when the work vehicle is in an acceleration state. Thereby, the acceleration performance of the work vehicle can be improved.

The above-described invention further includes an overheat state detection device that detects overheat information related to an engine overheat state of the work vehicle, and the control device receives the overheat information detected by the overheat state detection device and stores the overheat information in the overheat information. And determining whether the engine is overheated or not, and controlling the oil amount adjusting device or the variable speed hydraulic pump so that the cooling fan is not decelerated or stopped when it is determined that the engine is overheated. It is desirable to be configured accordingly. Further, it is desirable that the overheat state detection device is configured to detect the coolant temperature of the engine.

  In this configuration, it is determined whether or not the engine is overheated by the overheat state detection device, and when it is determined that the engine is overheated when the cooling fan is decelerated or stopped, or the cooling fan When it is determined that the engine is overheated when decelerating or stopping the engine, the engine is not overheated because the cooling fan is prevented from decelerating or stopping. Thereby, the acceleration performance of the work vehicle can be improved without causing the engine to overheat.

In addition, the present invention provides the oil amount adjusting device or the above-described oil amount adjusting device so as to decelerate or stop the cooling fan for a predetermined time when it is determined that the work vehicle is in an accelerating state and in a traveling state It may be configured to control a variable speed hydraulic pump.

  In this configuration, since the time for the cooling fan to decelerate or stop is limited, it is possible to prevent the engine from being overheated by appropriately setting this time. As a result, the acceleration performance of the work vehicle can be improved without causing the engine to overheat as described above.

According to the cooling fan control system of the present invention, acceleration performance can be improved when the work vehicle is in a running state, not a working state .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a wheel loader to which a cooling fan control system according to an embodiment of the present invention is applied. FIG. 2 is a block diagram showing a schematic configuration of a cooling fan control system according to an embodiment of the present invention. FIG. 3 is a flowchart showing the operation of the control system of the cooling fan control system of FIG. The wheel loader is an example of a vehicle to which a cooling fan control system is applied.

  As shown in FIG. 1, the wheel loader WL includes a vehicle body D, and a pair of wheels W are provided on the lower front side and the lower rear side of the vehicle body D, respectively. A base end portion of a hoist arm A is rotatably attached to a front portion of the vehicle body D, one end portion of an arm cylinder AC that moves up and down the hoist arm A is attached to a front portion of the vehicle body D, and the other end portion is a hoist arm A. It is attached to the base end side. A bucket B is rotatably attached to the tip of the hoist arm A. Further, the bucket B is connected via a lever L to a bucket cylinder BC that is rotatably attached to the front portion of the vehicle body D. The bucket B can be rotated by the bucket cylinder BC as indicated by an arrow in FIG.

  The vehicle body D is equipped with an engine E that generates power. Although not shown, for example, a radiator R that cools the cooling water for cooling the engine E and a cooling fan CF that cools the air through the air are disposed behind the engine E of the vehicle body D. The engine E includes a hydraulic pump OP that pumps hydraulic oil to a hydraulic motor OM that drives a cooling fan CF, which will be described later, and a transmission TM that changes the traveling speed (vehicle speed) of the wheel loader WL via a torque converter TC. Connected. The transmission TM is connected to the wheel W and transmits power from the engine E to the wheel W. Furthermore, the vehicle body D is provided with a steering cylinder SC that changes the traveling direction of the wheel loader WL, and the vehicle body D is steered.

  The vehicle body D is provided with an operation chamber OR, in which a handle H for steering the vehicle body D, a shift lever SL for operating the transmission TM, and a work machine for operating the hoist arm A and the bucket B as work machines. An operation lever M, an accelerator pedal AP for accelerating the wheel loader WL, and an operation control device (not shown) for controlling the operation of the wheel loader WL by operating these are provided. This operation control device includes a control system (control device) 3 for a cooling fan CF, which will be described later.

  A cooling fan control system according to an embodiment of the present invention will be described based on the block diagram of FIG. Parts that are the same as the components of the wheel loader shown in FIG.

  As shown in FIG. 2, the cooling fan control system includes a drive system 1 that drives a cooling fan CF that cools and cools a radiator R, a detection system 2 that detects operation information related to the operation state of the wheel loader WL, and the detection system. 2 and a control system 3 that controls the drive system 1 based on the operation information from 2.

  The drive system 1 includes a hydraulic motor OM that drives the cooling fan CF, an electromagnetic switching valve (oil amount adjusting device) 4 that adjusts the amount of hydraulic oil supplied to the hydraulic motor OM, and hydraulic pressure via the electromagnetic switching valve 4. A hydraulic pump OP that supplies hydraulic oil to the motor OM is provided.

  The hydraulic motor OM includes a known axial or radial piston motor driven by hydraulic pressure, a vane motor, a gear motor, and the like, and a cooling fan CF is connected to the end of the drive shaft. The outlet of the hydraulic motor OM is connected to the oil tank T via a hydraulic circuit, and the inlet of the hydraulic motor OM is connected to the electromagnetic switching valve 4 via the hydraulic circuit. The hydraulic motor OM is rotated by hydraulic oil fed from a hydraulic pump OP described later. Thereby, the cooling fan CF is rotated.

  The hydraulic pump OP is connected to the engine E via the torque converter TC as described above, and is driven by the engine E. As such a hydraulic pump OP, a known axial or radial piston pump, vane pump, gear pump, or the like can be used. The outlet of the hydraulic pump OP is connected to the electromagnetic switching valve 4 through a hydraulic circuit.

  The electromagnetic switching valve 4 is a known electromagnetic switching valve configured such that a built-in spool is driven by a solenoid and the position is switched to switch the flow path. The electromagnetic switching valve 4 is electrically connected to a control system 3 described later, and its internal flow path is switched based on an output signal from the control system 3. When the electromagnetic switching valve 4 is switched to the position 4a, hydraulic oil is supplied from the hydraulic pump OP to the hydraulic motor OM, and when switched to the position 4b, hydraulic oil is not supplied from the hydraulic pump OP to the hydraulic motor OM. Returned to tank T. As a result, the hydraulic motor OM is driven or stopped.

  The control system 3 includes a control calculation unit 31 that controls the operation of the cooling fan CF, a program that defines the operation procedure of the control calculation unit 31 (such as a program that controls the operation of the cooling fan CF), or the control calculation unit 31. A storage unit 32 that stores data to be processed by the control unit 31 and an interface 33 that outputs a calculation result calculated by the control calculation unit 31 to the electromagnetic switching valve 4 and receives an output signal from the detection system 2. Here, the control calculation unit 31 is mainly composed of a microprocessor, and the storage unit 32 is composed of a read only memory (ROM), a random access memory (RAM) and the like.

  The detection system 2 includes an angle sensor 5 that detects the angle 5a of the accelerator pedal AP, a first rotation speed sensor 6 that detects the output rotation speed 6a of the engine E, and a second rotation speed sensor that detects the output rotation speed 7a of the transmission TM. 7. A position sensor 8 for detecting the height position 8a of the hoist arm A, an angle sensor BAS for detecting the angle BA of the bucket B, a temperature sensor 9 for detecting the water temperature 9a of the radiator R, and a shift lever SL for outputting the gear stage number SLa The working machine operating lever M for outputting the position Ma of the working machine operating lever M, the engine control module (ECM) 10 for outputting the engine fuel injection control amount 10a, and the like. These are electrically connected to the interface 33, and each output signal is input to the interface 33.

  Among these output signals, the angle 5a of the accelerator pedal AP, the speed step number SLa, the engine fuel injection control amount 10a, the output rotational speed 6a of the engine E, and the output rotational speed 7a of the transmission TM are accelerations indicating the acceleration state of the wheel loader WL. Information, these are used alone or in combination. For example, when the angle 5a of the accelerator pedal AP is equal to or larger than a predetermined angle, it can be determined that the wheel loader WL is in an acceleration state. In addition, the shift speed number SLa is 1 or 2, and the angle 5a of the accelerator pedal AP is equal to or greater than a predetermined angle, and the angle 5a of the accelerator pedal AP is changed to a predetermined angle or more within a predetermined time (that is, the accelerator pedal AP is The rotational angular speed exceeds a predetermined value), the gear speed SLa is 1 or 2 and the rotational angular speed of the accelerator pedal AP exceeds a predetermined value, the engine fuel injection control amount 10a exceeds a predetermined value, the gear speed SLa is 1 or The wheel loader WL accelerates even when the engine fuel injection control amount 10a exceeds a predetermined value in two stages or the ratio of the output rotational speed 6a of the engine E to the output rotational speed 7a of the transmission TM is equal to or greater than a predetermined value. It can be determined that the state is present. These predetermined angles or predetermined values (judgment reference values) are set in advance by experiments or the like and stored in the storage unit 32. The angle sensor 5, the first and second rotational speed sensors 6, 7, the shift lever SL, and the ECM 10 that detect the acceleration information constitute an acceleration state detection device.

  Further, the height position 8a of the hoist arm A, the angle BA of the bucket B, the position Ma of the work machine operation lever M, or the output rotational speeds 6a and 7a of the engine E or transmission TM are travel information indicating the travel state of the wheel loader WL. These are used alone or in combination. For example, the position 8a of the hoist arm A is in a predetermined height range, the height position 8a of the hoist arm A is in a predetermined height range, and the position of the work implement operating lever M is a neutral position (a state of not working) ), The bucket angle BA is within the predetermined range, the bucket angle BA is within the predetermined range, and the position of the work control lever M is in the neutral position, or the output rotational speed 6a of the engine E It can be determined that the wheel loader WL is in a traveling state, for example, when the ratio of the transmission TM to the output rotational speed 7a is equal to or less than a predetermined value. These predetermined heights or predetermined values (determination reference values) are set in advance by experiments or the like and stored in the storage unit 32. The position sensor 8, the angle sensor BAS, the first and second rotational speed sensors 6, 7 and the work implement operating lever M that detect the traveling information constitute a traveling state detection device.

  Further, as a method for obtaining the travel information, a changeover switch 11 for switching the operation mode of the wheel loader WL between the operation mode and the travel mode between the electromagnetic switching valve 4 and the output side of the interface 33 shown in FIG. May be provided. Here, a physical switch is used as the changeover switch 11, but it may be provided in the control system 3 as a logical switch. In this configuration, when the operator switches the selector switch 11, the operation mode of the wheel loader WL can be switched between the traveling mode and the work mode.

  Further, the water temperature 9a of the radiator R is overheat information indicating whether or not the engine E is in an overheated state. In this case, when the water temperature 9a of the radiator R exceeds a predetermined value (for example, 100 ° C.), it is determined that it is in an overheated state. The predetermined value (determination reference value) is set in advance through experiments or the like and stored in the storage unit 32. In addition, the temperature sensor 9 etc. which detect this overheat information comprise an overheat state detection apparatus.

  The operation of the control system 3 described above will be described based on the flowchart of FIG.

  First, it is determined whether or not the wheel loader WL is in an accelerating state (step S1). When it is determined that the wheel loader WL is in an accelerating state, it is determined whether or not the previous wheel loader WL was in an accelerating state (step S2). ). When the wheel loader WL was in the acceleration state last time, the cooling fan CF remains in the load state (load state). Specifically, based on the output signal from the control system 3, the electromagnetic switching valve 4 shown in FIG. 2 is switched from the position 4b to the position 4a. However, when the electromagnetic switching valve 4 is in the position 4a, the state is maintained without switching the position. Thereby, the hydraulic oil supplied from the hydraulic pump OP is supplied to the hydraulic motor OM, and the cooling fan CF connected thereto is rotated. As a result, overheating of the engine E is suppressed.

  In step S2, if the wheel loader WL was not in the accelerated state last time, it is determined whether or not the wheel loader WL is in the traveling state (step S3). When the wheel loader WL is not in the traveling state, the cooling fan CF remains in the load state (load state). Thereby, overheating of the engine E is suppressed.

  In step S3, when the wheel loader WL is in the traveling state, it is determined whether or not the water temperature 9a of the radiator R exceeds a predetermined value (step S4). When the water temperature 9a of the radiator R exceeds a predetermined value, the cooling fan CF remains in a load state (load state). Thereby, overheating of the engine E is suppressed. When the water temperature 9a of the radiator R does not exceed the predetermined value, the cooling fan CF is set in a no-load state (unload state) for a predetermined period (step S5). Specifically, based on the output signal from the control system 3, the internal flow path of the electromagnetic switching valve 4 shown in FIG. 2 is switched from the flow path 4a to the flow path 4b. As a result, all the hydraulic oil supplied from the hydraulic pump OP is returned to the oil tank T, and no hydraulic oil is supplied to the hydraulic motor OM. As a result, the hydraulic motor OM stops and the cooling fan CF connected to the hydraulic motor OM also stops.

  By repeatedly executing the above steps S1 to S5, the power of the cooling fan CF can be suppressed. As a result, the load on the hydraulic pump OP is reduced, so that much power from the engine E can be used to accelerate the wheel loader WL. As a result, the acceleration performance of the wheel loader WL can be improved.

  Of the steps S1 to S5, steps S2 to S4 are provided to suppress the engine E from being overheated when improving the acceleration performance of the wheel loader WL as described above. Step S2 includes, in particular, that “the angle 5a of the accelerator pedal AP is equal to or greater than a predetermined angle” described above, or “the number of shift speeds SLa is 1 or 2 and the angle 5a of the accelerator pedal AP is equal to or greater than a predetermined angle. Is used as a criterion for determining whether or not the wheel loader WL is in an acceleration state. That is, the accelerator pedal 5a may remain in a state of a predetermined angle or more after the wheel loader WL is accelerated. For example, this state is obtained when the wheel loader WL continues to accelerate from the stopped state and continue traveling at a high speed. In such a state, the cooling fan CF is always unloaded and the engine E is likely to be overheated. In order to suppress this, it is necessary to provide step S2. Therefore, step S2 can be omitted when the above criterion is not used.

  In step S3, when the engine E is expected to be overheated, that is, when the wheel loader WL is not in a traveling state, for example, during “working” in which the engine E is in a high load state, It is provided to suppress the engine E from being overheated due to the deceleration or stop of the CF. Thus, overheating of the engine E can be suppressed before the water temperature 9a of the radiator R reaches a predetermined value in step S4. Note that step S3 can be omitted by lowering the predetermined value of the water temperature 9a of the radiator R to a value corresponding to step S3. Thereby, control of a cooling fan control system can be simplified.

  Step S4 is provided to suppress overheating of the engine E regardless of whether or not the wheel loader WL is working.

  As a modification of the above-described embodiment, an electromagnetic relief valve may be used instead of the electromagnetic switching valve 4. As another modification, an electromagnetic proportional valve or an electromagnetic proportional relief valve having a variable throttle mechanism inside may be used instead of the electromagnetic switching valve 4. In this case, the electromagnetic proportional valve or the electromagnetic proportional relief valve and the interface 33 of the control system 3 are electrically connected, and the opening degree of the variable throttle mechanism is appropriately adjusted based on the output signal from the control system 3. It is like that. Thereby, operation control of cooling fan CF according to the acceleration state of wheel loader WL can be performed.

  As another modification, a pilot pressure switching valve or a pilot pressure relief valve may be used instead of the electromagnetic switching valve 4.

  As another modification, the hydraulic pump OP may be a variable speed type without providing the electromagnetic switching valve 4. As such a hydraulic pump OP, for example, a known swash plate type hydraulic pump can be used. In this case, the hydraulic pump OP and the interface 33 of the control system 3 are electrically connected, and the inclination angle of the swash plate of the hydraulic pump OP is controlled based on the output signal from the control system 3. Yes. That is, the amount of hydraulic oil fed from the hydraulic pump OP can be changed. As a result, the rotational speed of the hydraulic motor OM can be changed. Thereby, operation control of cooling fan CF according to the acceleration state of wheel loader WL can be performed.

Cooling fan control apparatus according to the present invention can be improved acceleration performance is applied to the working vehicle both applications required.

1 is a side view of a wheel loader to which a cooling fan control system according to an embodiment of the present invention is applied. It is a block diagram showing a schematic structure of a cooling fan control system concerning one embodiment of the present invention. It is a flowchart which shows operation | movement of the control system of the cooling fan control system of FIG.

DESCRIPTION OF SYMBOLS 1 ... Drive system 2 ... Detection system 3 ... Control system 4 ... Electromagnetic switching valve WL ... Wheel loader OP ... Hydraulic pump OM ... Hydraulic motor CF ... Cooling fan

Claims (10)

A cooling fan control system for controlling the rotation speed of a cooling fan mounted on a work vehicle,
An oil pressure motor you drive the cooling fan,
Connected via a hydraulic circuit to the oil pressure motor, an oil pressure pump that will be driven by the engine,
Provided on the hydraulic circuit, the oil amount adjusting device for adjusting the amount of oil delivered to the hydraulic motor,
An acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle;
A travel state detection device that detects travel information including at least one of a position of a hoist arm of the work vehicle, an angle of a bucket, and a position of a work implement operation lever;
Based on the travel information detected by the travel state detection device, it is determined whether the work vehicle is in the work state or the travel state, and the work vehicle is operated based on the acceleration information detected by the acceleration state detection device. A controller that determines whether the vehicle is in an accelerated state or a non-accelerated state, and controls the oil amount adjusting device based on the determination results;
The control device that controls the oil amount adjusting device as above Symbol cooling fan is slowed or stopped when it is determined that the working vehicle is in and accelerating state in the running state, the cooling fan control system. The control device is configured such that the position of the hoist arm is in a predetermined height range, the height position of the hoist arm is in a predetermined height range, and the position of the work implement operating lever is in a neutral position, When at least one of the bucket angle is within a predetermined range and the bucket angle is within the predetermined range and the operation lever is in a neutral position, the work vehicle is in a traveling state. The cooling fan control system according to claim 1, wherein it is determined that A cooling fan control system for controlling the rotation speed of a cooling fan mounted on a work vehicle,
A hydraulic motor for driving the cooling fan;
A hydraulic pump driven by an engine connected to the hydraulic motor via a hydraulic circuit;
An oil amount adjusting device provided in the hydraulic circuit for adjusting the amount of oil supplied to the hydraulic motor;
An acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle;
A changeover switch for switching the operation mode of the work vehicle to a work mode and a travel mode;
According to the acceleration state of the work vehicle when the changeover switch is switched to the traveling mode and when it is determined that the work vehicle is in the acceleration state based on the acceleration information obtained from the acceleration state detection device. The oil amount adjusting device is controlled so that the cooling fan is decelerated or stopped, and the cooling fan is not decelerated or stopped according to the acceleration state of the work vehicle when the changeover switch is switched to the work mode. And a cooling fan control system. A cooling fan control system for controlling driving of a cooling fan mounted on a work vehicle,
An oil pressure motor you drive the cooling fan,
Configured to be able to vary the amount of feed Kyusuru oil to the oil pressure motor, and variable speed hydraulic pump driven by the engine,
An acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle;
A travel state detection device that detects travel information including at least one of a position of a hoist arm of the work vehicle, an angle of a bucket, and a position of a work implement operation lever;
Based on the travel information detected by the travel state detection device, it is determined whether the work vehicle is in the work state or the travel state, and the work vehicle is operated based on the acceleration information detected by the acceleration state detection device. A controller that determines whether the vehicle is in an accelerated state or a non-accelerated state, and controls the oil amount adjusting device based on the determination results;
The control device that controls the variable speed hydraulic pump as above Symbol cooling fan is slowed or stopped when it is determined that the working vehicle is in and accelerating state in the running state, the cooling fan control system. The control device is configured such that the position of the hoist arm is in a predetermined height range, the height position of the hoist arm is in a predetermined height range, and the position of the work implement operating lever is in a neutral position, When at least one of the bucket angle is within a predetermined range and the bucket angle is within the predetermined range and the operation lever is in a neutral position, the work vehicle is in a traveling state. The cooling fan control system according to claim 4, wherein it is determined that A cooling fan control system for controlling driving of a cooling fan mounted on a work vehicle,
A hydraulic motor for driving the cooling fan;
A variable speed hydraulic pump driven by an engine configured to change the amount of oil delivered to the hydraulic motor;
An acceleration state detection device for detecting acceleration information related to the acceleration state of the work vehicle;
A changeover switch for switching the operation mode of the work vehicle to a work mode and a travel mode;
According to the acceleration state of the work vehicle when the changeover switch is switched to the traveling mode and when it is determined that the work vehicle is in the acceleration state based on the acceleration information obtained from the acceleration state detection device. The variable speed hydraulic pump is controlled so that the cooling fan is decelerated or stopped, and the cooling fan is not decelerated or stopped according to the acceleration state of the work vehicle when the changeover switch is switched to the work mode. A cooling fan control system comprising a configured control device . The acceleration state detecting device, the angle of the accelerator pedal of a work vehicle, number of speeds, the engine fuel injection control amount, which is configured to detect at least one of the output rotational speed of the engine or transmission, to claim 1 The cooling fan control system according to any one of 6 . The apparatus further comprises an overheat state detection device that detects information related to an overheat state of the engine of the work vehicle,
The control device receives the overheat information detected by the overheat state detection device, determines whether the engine is in an overheat state based on the overheat information, and determines that the engine is in an overheat state The cooling fan control system according to any one of claims 1 to 7, wherein the oil amount adjusting device or the variable speed hydraulic pump is controlled so that the cooling fan is not decelerated or stopped.   The cooling fan control system according to claim 8, wherein the overheat state detection device is configured to detect a coolant temperature of engine cooling water. The controller adjusts the oil amount so that the cooling fan is decelerated or stopped for a predetermined time when it is determined that the work vehicle is in an accelerating state and in a traveling state, or is determined to be in an accelerating state. The cooling fan control system according to any one of claims 1 to 9, wherein the cooling fan control system is adapted to control a variable speed hydraulic pump.

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