KR102350834B1 - Device and method for a hydraulic circuit control of a construction machine - Google Patents

Abstract

The apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention allow the flow rate distribution between the traveling motor and the front work device to be adjusted when a front work is required in a state where the straight travel function is activated.
The apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention allow the operator to reset the flow rate distribution of hydraulic oil between the traveling motor and the front working device to a desired ratio, thereby improving the performance of the front working device by the current worker. You can set it to suit your taste.

Description

Device and method for a hydraulic circuit control of a construction machine

The present invention relates to an apparatus and method for controlling a hydraulic circuit of a construction machine, and more particularly, to a construction machine capable of adjusting the flow rate distribution between a traveling motor and a front work device when a front work is required in a state in which the straight run function is activated. It relates to a hydraulic circuit control apparatus and method of

In general, a construction machine is provided with a hydraulic circuit device and a working device. The hydraulic circuit device is composed of a control unit, a control valve, a pump, and an actuator. The working device includes, for example, an excavator among construction machines, a boom structure, an arm structure, a bucket structure, and an optional device.

The control unit includes a joystick, a pedal, and the like, which are provided in the driver's seat. The control valve provides a flow rate corresponding to the operation displacement of the joystick to the corresponding actuator. The pump may be provided as a first pump and a second pump, and forms a pressure in the hydraulic oil and provides it to the control valve. The actuator is actuated by the supplied hydraulic oil to operate the working device.

On the other hand, the actuator includes a left traveling motor and a right traveling motor used for traveling, and there are a boom cylinder, arm cylinder, bucket cylinder, and option cylinder used for front work. In addition, the actuator has a swing motor for turning the upper body.

Construction machinery can operate left/right driving at the same time, and at this time, the flow rate discharged from all pumps is used by the driving motor. In this way, when any one or a plurality of the boom, arm, bucket, and option device is operated while driving is operated, the driving straight control valve is activated and the flow path is changed. As a result, the flow path blocked by the traveling spool is connected to the pump, and other working devices can be operated while traveling.

However, in the conventional hydraulic circuit device, when the operation of the front working device is requested in a state in which the travel straight control valve is activated, the performance of the front working device may not meet expectations.

On the other hand, there are cases in which several workers operate the same construction machine in turn. And each operator may have a different preference for the performance of the front work device.

For example, a certain operator may be satisfied with the performance of the front work device when operating the front work device in a state where running straight is activated. However, other operators may feel uncomfortable with the performance of the front work device.

In addition, if the load is changed due to a change in the attachment to the front work device, the existing preferred tendency may be changed.

Korean Patent Publication No. 10-4003-0008069 (4003.01.24.) Korean Patent Publication No. 10-4005-0066031 (4005.06.30.)

Therefore, the technical problem to be achieved by the present invention is to control the flow distribution of hydraulic oil with the front working device when the operation of the front working device is required while the running straight control valve is activated, so that the operator can perform the desired operation of the front working device. An object of the present invention is to provide an apparatus and method for controlling a hydraulic circuit of a construction machine so that performance can be realized.

The technical task to be achieved by the present invention is not limited to the technical task mentioned above, and another technical task not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In the hydraulic circuit control device for a construction machine according to an embodiment of the present invention for achieving the above technical problem, a control value for controlling the electro-proportional control valve 50 is input, and the front working device control valve unit 20 an input unit 100 to which an operation request is input; The hydraulic oil discharged from the first pump 11 is provided to the first front working device control valve group 21 and the second front working device control valve group 22 , and the hydraulic oil discharged from the second pump 12 is on the left a processing unit 200 that outputs the control value when a request for operation of the front working device is input in a state in which the traveling straight control valve 40 is activated so as to be provided to the traveling motor 31 and the right traveling motor 32; and a performing unit 300 that controls the electro-proportional control valve 50 according to the control value so that the hydraulic oil discharged from the sub-pump 13 is provided to the traveling straight control valve 40 .

Also, in the apparatus for controlling the hydraulic circuit of a construction machine according to an embodiment of the present invention, the control value may be a value previously input by the manufacturer of the construction machine.

In addition, in the hydraulic circuit control device for a construction machine according to an embodiment of the present invention, the control value is provided to the first front working device control valve group 21 or the second front working device control valve group 22 . It may be greater than or equal to the displacement value of the spool of the electronic proportional control valve 50 corresponding to the inflection point of the flow rate.

In addition, the control value may be in the range of 70% to 100% with respect to the maximum displacement to which the spool of the electro-proportional control valve 50 is moved.

In addition, in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention, the control value may be reset by a user.

A method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention for achieving the above technical problem, a first step of inputting a control value for controlling the electronic proportional control valve (50); a second step in which the running straight control valve 40 is activated so that the running performance of the construction machine is controlled to have priority over the performance of the front work device; a third step in which an operation request for operation of the front working device control valve unit 20 is input; and a fourth step of controlling the electromagnetic proportional control valve 50 according to the control value so that the hydraulic oil discharged from the sub-pump 13 is provided to the traveling straight control valve 40 .

In addition, in the method for controlling the hydraulic circuit of a construction machine according to an embodiment of the present invention, the control value may be a value previously input by the manufacturer of the construction machine.

In addition, in the hydraulic circuit control method of a construction machine according to an embodiment of the present invention, the control value is provided to the first front working device control valve group 21 or the second front working device control valve group 22 . It may be greater than or equal to the displacement value of the spool of the electronic proportional control valve 50 corresponding to the inflection point of the flow rate.

In addition, the control value may be in the range of 70% to 100% with respect to the maximum displacement to which the spool of the electro-proportional control valve 50 is moved.

In addition, in the hydraulic circuit control method of a construction machine according to an embodiment of the present invention, the control value may be reset by a user.

The details of other embodiments are included in the detailed description and drawings.

In the apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention made as described above, when an operation of the front working device is required, the traveling straight control valve is activated to adjust the flow rate distribution between the traveling motor and the front working device. can

In addition, the apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention allow the operator to reset the distribution of hydraulic oil flow rate between the traveling motor and the front working device to a desired ratio, thereby improving the performance of the front working device. It can be set to suit the taste of the operator.

1 and 2 are diagrams for explaining a hydraulic circuit of a construction machine according to an embodiment of the present invention.
3 is a view for explaining a flow rate change according to the switching of the running straight control valve in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.
4 is a view for explaining an apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention.
5 is a view for explaining a flow rate change with respect to a pilot pressure in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are illustratively shown to aid understanding of the present invention, and the present invention may be implemented with various modifications different from the embodiments described herein. However, in the description of the present invention, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the gist of the present invention, the detailed description and detailed illustration thereof will be omitted. In addition, the accompanying drawings are not drawn to scale, in order to help the understanding of the invention, the size of some components may be exaggerated.

On the other hand, the terms to be described later are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, so the definition should be made based on the content throughout this specification.

Like reference numerals refer to like elements throughout.

Hereinafter, an apparatus for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 . 1 and 2 are views for explaining a hydraulic circuit of a construction machine according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the hydraulic control device of the construction machine includes the first and second pumps 11 and 12, the sub-pump 13, the front working device control valve unit 20, and the left running motor control valve unit. 31 , the right traveling motor control valve unit 32 , the traveling straight control valve 40 , the electromagnetic proportional control valve 50 , the main control valve and various actuators.

The first and second pumps 11 and 12 form a pressure in hydraulic oil and discharge it toward the main control valve. The sub-pump 13 discharges the pilot hydraulic oil.

The main control valve includes the aforementioned front working device control valve unit 20 , the left traveling motor control valve unit 31 , and the right traveling motor control valve unit 32 .

The front working device control valve unit 20 may be divided into a first front working device control valve unit 21 and a second front working device control valve unit 22 .

The first front working device control valve unit 21 may include a bucket control valve unit and a boom control valve unit. The bucket control valve unit controls the supply of hydraulic oil to the bucket cylinder. The boom control valve unit controls the supply of hydraulic oil to the boom cylinder. Meanwhile, a control valve unit of another optional device may be further added to the first front working device control valve unit 21 .

The second front working device control valve unit 22 may include an arm control valve unit and a swing control valve unit. The arm control valve unit controls the supply of hydraulic oil to the arm cylinder. The swing control valve unit controls to provide hydraulic oil to the swing motor. Meanwhile, a control valve unit of another optional device may be further added to the second front working device control valve unit 22 .

The traveling straight control valve 40 is disposed between the first and second pumps 11 and 12 and the main control valve to determine the flow direction of the hydraulic oil discharged from the first and second pumps 11 and 12 .

The traveling straight control valve 40 may be provided as a 2-position 4-port.

When the spool of the traveling straight control valve 40 is at the first position 41, as shown in FIG. 1, the hydraulic oil discharged from the first pump 11 controls the left traveling motor 31 and the first front working device. A valve group 21 is provided. And the hydraulic oil discharged from the second pump 12 is provided to the right traveling motor 32 and the second front working device control valve group 22 .

On the other hand, in order for the spool of the traveling straight control valve 40 to be positioned at the first position 41 , the electronic proportional control valve 50 is not operated, that is, a signal is not input.

When the spool of the traveling straight control valve 40 is at the second position 42, as shown in FIG. 2, the hydraulic oil discharged from the first pump 11 is the first front working device control valve group 21 and the second position 42. 2 is provided in the front working device control valve group (22). And the hydraulic oil discharged from the second pump 12 is provided to the left traveling motor 31 and the right traveling motor 32 .

On the other hand, in order for the spool of the traveling straight control valve 40 to be located at the second position 42 , the electronic proportional control valve 50 is activated, that is, a signal is being input.

That is, when the spool of the traveling straight control valve 40 is switched to the second position, the first pump 11 is in charge of the front working device control valve unit 20 , and the second pump 12 is the left traveling motor 31 . ) and the right running motor (32). As a result, when the construction machine is running, running performance, in particular, the straight-line performance of running is improved.

On the other hand, when the spool of the traveling straight control valve 40 is at the second position 42 , the pressure of the hydraulic oil is lowered between the second port (B) and the third port (C) of the traveling straight control valve 40 . Some can be moved.

Hereinafter, the flow path area change according to the spool displacement of the traveling straight control valve 40 will be described with reference to FIG. 3 . 3 is a view for explaining a flow rate change according to the switching of the running straight control valve in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.

As for the spool of the traveling straight control valve 40 , the spool displacement is determined by the control of the electromagnetic proportional control valve 50 . And the position of the spool of the electro-proportional control valve 50 is determined according to the strength of the current value.

On the other hand, as the spool of the traveling straight control valve 40 is moved, the flow direction of the hydraulic oil and the flow rate of the hydraulic oil are changed. That is, the flow path area varies according to the movement of the spool. The larger the flow path area, the higher the flow rate, and the narrower the flow path area, the lower the flow rate.

The traveling straight control valve 40 is provided with 4 ports, so that 4 flow paths may be formed. The first port (A) is connected to the first pump (11). The second port (B) is connected to the front working device control valve (20). The third port (C) is connected to the left driving motor control valve unit 31 for controlling the left driving motor. The fourth port (D) is connected to the second pump (12). Meanwhile, the second pump 12 is connected to the right traveling motor control valve unit 32 for controlling the right traveling motor.

The first flow path is a flow path connected from the first port (A) to the third port (C). The second flow path is a flow path connected from the fourth port (D) to the third port (C). The third flow path is a flow path connected from the first port (A) to the second port (B). The fourth flow path is a flow path connected from the fourth port (D) to the third port (C).

3 shows flow path area diagrams of the first, second, and third flow paths, it is possible to understand how the flow rate is changed when the spool of the traveling straight control valve 40 is switched.

As shown in FIG. 3, when the spool of the traveling straight control valve 40 has no spool displacement, the first flow path opens to the maximum area, and it can be seen that the area of the first flow path becomes narrower as the spool displacement increases. .

In addition, it can be seen that the second flow path is gradually opened from the point when the spool of the traveling straight control valve 40 reaches a level of about 20% with respect to the maximum spool displacement, and the area becomes larger as the spool displacement increases. have. In addition, it can be seen that the area of the second flow path becomes the maximum from the point when the spool of the traveling straight control valve 40 reaches a level of approximately 70% to 80% of the spool displacement with respect to the maximum spool displacement.

In addition, the third and fourth flow passages are gradually opened from the point when the spool of the traveling straight control valve 40 reaches a level of about 40% to 50% of the maximum spool displacement, and as the spool displacement increases, the third , it can be seen that the area of 4 euros gradually increases. In addition, it can be seen that the area of the third and fourth flow paths becomes the maximum from the point when the spool of the traveling straight control valve 40 reaches a level of approximately 70% to 80% of the spool displacement with respect to the maximum spool displacement.

The hydraulic circuit control device for a construction machine according to an embodiment of the present invention has a maximum spool displacement ( 100%), the position of the spool of the traveling straight control valve 40 is controlled to a desired position. The spool displacement of 70% to 80% or more is a section in which there is no change in the flow rate of the second flow path and the flow rate of the third and fourth flow paths and only the flow rate change of the first flow path exists. The flow rate to be merged with the area change is changed, so that it is possible to control the working performance of the front working device.

As described above, the travel straight control valve 40 is affected by the control of the electro-proportional control valve 50 . That is, the spool position of the traveling straight control valve 40 is determined according to the control value provided to the electronic proportional control valve 50 . To elaborate on this, when a current is applied to the electro-proportional control valve 50, the spool of the electro-proportional control valve 50 is moved, and the movement displacement varies according to the magnitude of the current. And the more the spool of the electro-proportional control valve 50 moves, the more the flow rate is provided from the sub-pump 13 to the travel straight control valve 40 . Accordingly, the traveling straight control valve 40 is controlled according to the control value of the electronic proportional control valve 50 .

Meanwhile, as shown in FIG. 4 , the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention includes an input unit 100 , a processing unit 200 , and an execution unit 300 . 4 is a view for explaining an apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention.

In the input unit 100, a control value for controlling the electro-proportional control valve 50 is input, and a request for operation of the front working device is input. In addition, whether the travel straight control valve 40 is activated may be input to the input unit 100 . Also, a front working device operation request for controlling the front working device may be input to the input unit 100 .

The processing unit 200 outputs the control value of the electronic proportional control valve 50 when there is hydraulic oil for controlling the front working device in a state in which the travel straight control valve 10 is activated.

The performing unit 300 controls the electronic proportional control valve 50 according to the control value of the electronic proportional control valve 50 so that the hydraulic oil discharged from the sub pump 13 is provided to the traveling straight control valve 40 . Controlled.

Therefore, in the hydraulic circuit control device for a construction machine according to an embodiment of the present invention, when the operation of the front working device is required in a state in which the running straight control valve 40 is activated, the control value of the electronic proportional control valve 50 is applied. The flow distribution between the travel motor and the front work device can be adjusted accordingly.

Referring to FIG. 3 , the flow rate distributed toward the front working device control valve unit 20 can be increased or decreased by controlling to what extent the position of the spool of the traveling straight control valve 40 is positioned.

By allowing more flow to be distributed toward the front working device control valve unit 20, the working performance of the front working device is improved.

On the other hand, in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention, the control value of the electronic proportional control valve 50 may be a value previously input by the manufacturer of the construction machine. That is, in general, by pre-inputting the flow rate distribution ratio preferred by the operator, the operator can select the flow rate distribution ratio according to his or her preference. Here, the control value may be understood as a current value to be applied to the travel straight control valve 40 . That is, when the current value is set to the maximum size, the spool of the travel straight control valve 40 is positioned with the maximum displacement.

On the other hand, in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention, the control value may be 70% to 100% with respect to the maximum displacement by which the spool of the electro-proportional control valve 50 is moved. Accordingly, it is possible to prevent the operator from setting the spool displacement of the travel straight control valve 40 to be too small. In other words, by setting the spool displacement of the straight travel control valve 40 to 70% or more, it is possible to maintain the straight travel performance of the excavator.

On the other hand, in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention, the control value may be reset by the user. A worker may desire a greater weight in any one of the driving performance of the construction machine and the performance of the working device of the construction machine according to the individual tendency or the type of work.

Therefore, it is possible to determine how much flow to distribute more toward the front work device control valve unit 20 according to the taste of the operator, thereby satisfying the taste of the operator or distributing the flow rate suitable for the type of work. there will be

Hereinafter, a method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention will be described for each step.

Step 1: This is a step in which a control value for controlling the electronic proportional control valve 50 is input to the input unit 100 . The control value of the electronic proportional control valve 50 is for activating the function of the traveling straight control valve 40 . That is, when the signal of the electronic proportional control valve 50 is not input, the traveling straight control valve 40 maintains the first position 41 and when the signal of the electronic proportional control valve 50 is input. The traveling straight control valve 40 is switched to the second position 42 .

Step 2: This is a step in which the running straight control valve 40 is activated so that the running performance of the construction machine takes priority over the performance of the front work device. In the case of the construction machine running straight control valve 40 is inactive, if the front working device is operated while driving, the flow rate of hydraulic oil provided to the left running motor and the right running motor may be different, so that the running of the construction machine is meandering. can That is, in order to improve the straight running performance of the construction machine, the running straight control valve 40 is activated.

When the traveling straight control valve 40 is activated, the flow paths of the hydraulic oil provided to the front working device and the traveling motor in the first and second pumps 11 and 12 are switched. That is, one pump is to provide hydraulic oil to the two left traveling motors and the right traveling motor, and the other pump is to provide hydraulic oil to the front working device.

Step 3: This is a step in which an operation request for operation of the front working device control valve unit 20 is input. The operation of the front working device may be required in a state in which the travel straight control valve 40 is activated. The operation request of the front working device can be confirmed by detecting a pilot signal generated when the joystick is operated.

Step 4: It is a step in which the electronic proportional control valve 50 is controlled according to the control value so that the hydraulic oil discharged from the sub-pump 13 is provided to the travel straight control valve 40 . The sub-pump 13 is provided to the pressure receiving part of the spool of the traveling straight control valve 40 via the electromagnetic proportional control valve 50 . And since the control value of the electronic proportional control valve 50 is determined, the area in which the spool of the electronic proportional control valve 50 is opened is determined. Accordingly, the flow rate of the pilot hydraulic oil passing through the electromagnetic proportional control valve 50 is determined. As a result, the spool of the straight travel control valve 40 has a spool displacement in proportion to the control value provided to the electro-proportional control valve 50 , and the opening area of the third and fourth flow paths of the straight travel control valve 40 is realized. this is decided

Therefore, depending on how the control value for controlling the electro-proportional control valve 50 is set, the flow rate of the hydraulic oil toward the front working device control valve unit 20 can be increased or decreased, which can control the working performance of the front working device. there will be

Here, if the working performance of the front working device is considered more important than the driving performance of the construction machine, the performance of the front working device can be improved by setting the control value of the electronic proportional control valve 50 to be larger in the first step. there will be

On the other hand, in the method for controlling the hydraulic circuit of a construction machine according to an embodiment of the present invention, the control value of the electronic proportional control valve 50 may be a value previously input by the manufacturer of the construction machine. That is, in general, by pre-inputting the flow rate distribution ratio preferred by the operator, the operator can select the flow rate distribution ratio according to his or her taste, thereby increasing the operator's convenience.

On the other hand, in the hydraulic circuit control method of the construction machine according to the embodiment of the present invention, the control value may be 70% to 100% with respect to the maximum displacement of the spool of the electro-proportional control valve 50 is moved. Accordingly, it is possible to prevent the operator from setting the spool displacement of the travel straight control valve 40 to be too small. In other words, by setting the spool displacement of the running straight control valve 40 to 70% or more, it is possible to maintain the straight running performance of the excavator well.

On the other hand, in the hydraulic circuit control method of a construction machine according to an embodiment of the present invention, the control value may be reset by the user. Therefore, it is possible to determine how much flow to distribute more toward the front work device control valve unit 20 according to the taste of the operator, thereby satisfying the taste of the operator or distributing the flow rate suitable for the type of work. there will be

Hereinafter, the effect of the hydraulic circuit control apparatus and method of a construction machine according to an embodiment of the present invention will be described with reference to FIG. 5 . 5 is a view for explaining a flow rate change with respect to pilot pressure in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.

According to FIG. 5 , as the pilot pressure of the traveling straight control valve increases, both the flow rate of the hydraulic oil provided to the right traveling motor and the flow rate provided to the left traveling motor decrease, and the reduced flow rate is provided toward the front working device to provide the front working device. It can be seen that the flow rate to be provided is increased.

Here, the pilot pressure of the straight travel control valve may be understood as the pressure of the pilot hydraulic oil applied to the spool of the straight travel control valve 40 . As a result, the pilot pressure of the straight travel control valve may be understood to have the same meaning as the control value provided to the electronic proportional control valve 50 .

On the other hand, as shown in Fig. 5, in the control range below the inflection point section (R), the flow rate provided to the front working device is rapidly reduced, so it is preferable to set the spool displacement only in the section above the inflection point section (R). The inflection point section R may be approximately 70%.

On the other hand, in FIG. 5 , it may be seen that the flow rate of the hydraulic oil provided to the left traveling motor is decreased more compared to the flow rate of the hydraulic oil provided to the right traveling motor, but the graph described in FIG. 5 explains the increase and decrease of the flow rate. It is exaggerated for

The apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention made as described above, when the operation of the front work device is required while the running straight control valve 40 is activated, the traveling motor and the front work The flow distribution between devices can be adjusted.

In addition, the apparatus and method for controlling a hydraulic circuit of a construction machine according to an embodiment of the present invention allow the operator to reset the distribution of hydraulic oil flow rate between the traveling motor and the front working device to a desired ratio, thereby improving the performance of the front working device. It can be set to suit the taste of the operator.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims, and from the meaning and scope of the claims and their equivalents. All derived changes or modifications should be construed as being included in the scope of the present invention.

The hydraulic circuit control device for a construction machine according to an embodiment of the present invention may be used to adjust the operating performance of the front working device when the front working device is operated to move while the construction machine is running.

11, 12: first and second pumps
13: sub pump
20: front working device control valve unit
21, 22: 1st, 2nd front working device control valve unit group
31: left running motor control valve unit
32: right running motor control valve unit
40: travel straight control valve
50: electronic proportional control valve

Claims (8)

an input unit 100 to which a control value for controlling the electro-proportional control valve 50 is input and an operation request of the front working device control valve unit 20 is input;
The hydraulic oil discharged from the first pump 11 is provided to the first front working device control valve group 21 and the second front working device control valve group 22 , and the hydraulic oil discharged from the second pump 12 is on the left a processing unit 200 that outputs the control value when a request for operation of the front working device is input in a state in which the traveling straight control valve 40 is activated so as to be provided to the traveling motor 31 and the right traveling motor 32; and
The electronic proportional control valve 50 is controlled according to the control value, so that the hydraulic oil discharged from the sub-pump 13 is controlled to be provided to the traveling straight control valve 40;
The control value is the displacement of the spool of the electro-proportional control valve 50 corresponding to an inflection point of the flow rate provided to the first front working device control valve group 21 or the second front working device control valve group 22 . Hydraulic circuit control device of a construction machine, characterized in that more than the value.
The method of claim 1,
That the control value is a value entered in advance by the manufacturer of the construction machine
A hydraulic circuit control device of a construction machine, characterized in that
delete The method of claim 1,
that the control value is reset by the user
A hydraulic circuit control device of a construction machine, characterized in that
A first step of inputting a control value for the control of the electronic proportional control valve (50);
a second step in which the running straight control valve 40 is activated so that the running performance of the construction machine is controlled to have priority over the performance of the front work device;
a third step in which an operation request for operation of the front working device control valve unit 20 is input; and
A fourth step of controlling the electromagnetic proportional control valve 50 according to the control value so that the hydraulic oil discharged from the sub-pump 13 is provided to the traveling straight control valve 40;
The control value is greater than or equal to the displacement value of the spool of the electro-proportional control valve 50 corresponding to the inflection point of the flow rate provided to the first front working device control valve group 21 or the second front working device control valve group 22 . Hydraulic circuit control method of a construction machine, characterized in that.
6. The method of claim 5,
That the control value is a value entered in advance by the manufacturer of the construction machine
A hydraulic circuit control method of a construction machine, characterized in that
delete 6. The method of claim 5,
that the control value is reset by the user
A hydraulic circuit control method of a construction machine, characterized in that

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