WO2016080760A1

WO2016080760A1 - Apparatus for controlling hydraulic circuit of construction equipment

Info

Publication number: WO2016080760A1
Application number: PCT/KR2015/012417
Authority: WO
Inventors: 조영식
Original assignee: 두산인프라코어 주식회사
Priority date: 2014-11-20
Filing date: 2015-11-18
Publication date: 2016-05-26
Also published as: EP3222784A4; KR20170091115A; KR102088091B1; EP3222784A1; CN107002390A

Abstract

The present invention relates to an apparatus for controlling the hydraulic circuit of construction equipment. The apparatus for controlling the hydraulic circuit of construction equipment according to one embodiment of the present invention is configured such that when travelling and working are required at the same time, the flux of a first pump can be provided early to a front working apparatus, thereby advancing the time of actually initiating the operation of the front working apparatus. In addition, the apparatus for controlling the hydraulic circuit of construction equipment according to the embodiment of the present invention allows the spool of a control valve (20) to be controlled according to a control map and thus can mitigate an impact caused by a reduction in travel speed.

Description

Hydraulic circuit controller of construction machinery

The present invention relates to a hydraulic circuit control device for a construction machine, and more particularly, to a hydraulic circuit control device for a construction machine that can mitigate the impact caused by the flow rate change when the traveling and front work at the same time.

Construction machinery generally includes a hydraulic circuit device and a work device. The hydraulic circuit device includes an operation unit, a control valve, a pump, and an actuator. Work tools include, for example, excavators among construction machines, boom structures, arm structures, bucket structures and optional devices.

The operation unit includes a joystick and a pedal provided in the driver's seat. The main control control valve provides the actuator with a flow rate corresponding to the joystick displacement. The pump may be provided with a first pump and a second pump, and provide pressure to the working oil to the main control control valve. The actuator is actuated by the hydraulic oil provided to allow the work tool to operate.

On the other hand, the actuator includes a left driving motor and a right driving motor used for driving, a boom cylinder, an arm cylinder, a bucket cylinder and an option cylinder used for front work, and a swing motor for turning the upper body.

On the other hand, the construction machine can select the driving mode and the working mode. When the driving mode is selected, the straight running performance is improved, and when the working mode is selected, the work performance is given priority over the driving performance.

And if you want to switch between driving mode and working mode, you can switch by operating control valve.

However, in the conventional hydraulic circuit device, when the control valve is operated, the flow path of the hydraulic oil may be changed suddenly, thereby causing a problem in that each driving speed is suddenly reduced while shock is generated. That is, an impact is generated when the operation of the front work device is required while driving straight is performed.

In addition, the conventional hydraulic circuit device has a problem that the front work is slow to proceed immediately after operating the control valve. In detail, when the operator operates the joystick to perform a desired task during the driving straight, there is a problem that the time from operating the joystick to the time when the actuator actually starts to operate is long. have. That is, there is a problem that the operation of the front work device is delayed when the operation of the front work device is required while the driving straight is performed.

Prior art literature

(Patent Document 1) Republic of Korea Patent Publication No. 10-2003-0008069 (2003.01.24.)

(Patent Document 2) Republic of Korea Patent Publication No. 10-2005-0066041 (2005.06.30.)

Accordingly, an object of the present invention is to provide a hydraulic circuit control device for a construction machine that can solve the shock generated when the operation of the front work device is required while driving straight ahead.

It is another object of the present invention to provide a hydraulic circuit control device for a construction machine that can reduce the time for which the operation of the front work device is delayed when the operation of the front work device is required while driving straight is performed. .

Hydraulic circuit control device for a construction machine according to an embodiment of the present invention for achieving the above technical problem, the first, second pump (11, 12); A first driving motor 41 receiving a flow rate discharged from the first pump 11; A second driving motor 42 receiving a flow rate discharged from the second pump 12; A front work device 50 receiving a flow rate discharged from the first pump 11 or the second pump 12; A control valve 20 installed in a flow path between the first and

second pumps

11 and 12 and the front work device 50; A joystick (110) generating a first operation signal for operating the front work device (50); A driving pedal 120 generating a second operation signal for operating the first and

second driving motors

41 and 42; And when both of the first operation signal and the second operation signal are input, calculate a control value for controlling the control valve 20 based on a control map, and calculate the control value to the control valve 20. And a control unit 400 for outputting.

In addition, the hydraulic circuit control device of a construction machine according to an embodiment of the present invention, when the control valve 20 is controlled can supply the flow rate discharged from the second pump 12 to the first travel motor (41). have.

In addition, in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention, the control valve 20 is the flow rate discharged from the first pump 11 and the flow rate discharged from the second pump 12 is joined. can do.

In addition, in the hydraulic circuit control device of a construction machine according to an embodiment of the present invention, the front work device 50 may include a boom cylinder, arm cylinder and bucket cylinder.

In addition, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the control map is from the operation request time point t0 of the front work device 50 to the time point t2 at which the displacement of the spool becomes maximum. The control value may be changed to a constant slope.

In addition, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 40 with respect to the maximum displacement at the operation request time t0 of the front work device 50. The control value may be calculated to be from% to 80%.

In addition, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 40 with respect to the maximum displacement at the operation request time t0 of the front work device 50. The control value may be calculated to be from% to 65%.

In addition, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 55 with respect to the maximum displacement at the operation request time t0 of the front work device 50. The control value may be calculated to be from% to 75%.

In addition, the hydraulic circuit control device of a construction machine according to an embodiment of the present invention, the control value from the operation time point t0 of the front work device 50 to the time point t2 when the displacement of the spool becomes the maximum This may be increasing.

In addition, the hydraulic circuit control device of a construction machine according to an embodiment of the present invention, the control value from the operation time point t0 of the front work device 50 to the time point t2 when the displacement of the spool becomes the maximum It may be changed to this constant slope (a).

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

In the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention made as described above, the flow rate of the first pump can be provided to the front work device early when traveling and work is required at the same time, thereby the front work device is You can actually advance the starting point of operation.

In addition, the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, by controlling the displacement of the spool of the control valve to a constant slope can mitigate the impact due to the running speed deceleration.

1 and 2 are views for explaining the hydraulic circuit of the construction machine according to an embodiment of the present invention.

3 is a view for explaining the flow rate change according to the switching of the control valve in the hydraulic circuit control device of a construction machine according to an embodiment of the present invention.

4 is a view for explaining a hydraulic circuit control method of a construction machine according to an embodiment of the present invention.

5 is a view for explaining a control map for controlling the control valve in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.

6 is a view for explaining the effect of the hydraulic circuit control device of a construction machine according to an embodiment of the present invention.

* Description of the drawing symbols *

11, 12: 1st, 2nd pump

20: control valve

31, 32: 1st, 2nd control valve

41: first driving motor

42: second driving motor

50: front attachment

51, 52: first and second actuator group

100: input unit

110: joystick

120: driving pedal

200: processing unit

210: judgment

220: control map

300: output unit

400: control unit

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

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. Embodiments described below are shown by way of example in order to help understanding of the present invention, it will be understood that the present invention can be implemented in various modifications different from the embodiments described herein. However, in the following description of the present invention, if it is determined that the detailed description of the related known functions or components may unnecessarily obscure the gist of the present invention, the detailed description and the detailed illustration will be omitted. In addition, the accompanying drawings may be exaggerated in size of some components, rather than drawn to scale to facilitate understanding of the invention.

Meanwhile, terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and the definitions thereof should be made based on the contents throughout the present specification.

Like reference numerals refer to like elements throughout.

Hereinafter, a hydraulic circuit control apparatus 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.

Hydraulic control apparatus for a construction machine according to an embodiment of the present invention, as shown in Figures 1 and 2, the first, the second pump (11, 12), the control valve 20, the main control valve and various actuators can do.

The first and

second pumps

11 and 12 form a pressure in the hydraulic oil and discharge the same.

The control valve 20 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.

Various actuators may include a first travel motor 41, a second travel motor 42, and a front work device 50.

The front work device 50 described above may include a boom cylinder, an arm cylinder, a bucket cylinder. In more detail, the front work device 50 may be divided into a first actuator group 51 and a second actuator group 52.

The first actuator group 51 may include an arm 2 speed cylinder, a boom 1 speed cylinder, and a bucket cylinder. The first actuator group 51 may further include an optional device.

The second actuator group 52 may include an arm 1 speed cylinder, a boom 2 speed cylinder, and a swing motor, while the second actuator group 52 may further include another option device.

The control valve 20 may be a two position four port valve.

When the spool of the control valve 20 is in the first position, as shown in FIG. 1, the hydraulic oil discharged from the first pump 11 is provided to the first travel motor 41 and the first actuator group 51. . The hydraulic oil discharged from the second pump 12 is provided to the second driving motor 42 and the second actuator group 52.

When the spool of the control valve 20 is in the second position, as shown in FIG. 2, the hydraulic oil discharged from the first pump 11 is provided to the first actuator group 51 and the second actuator group 52. . The hydraulic oil discharged from the second pump 12 is provided to the first travel motor 41 and the second travel motor 42.

That is, when the spool of the control valve 20 is switched to the second position, the first pump 11 is in charge of the front work device 50, and the second pump 12 is connected to the first travel motor 41 and the second. It is in charge of the traveling motor 42. This improves the straightness of travel when the construction machine travels.

Hereinafter, the flow path area change according to the spool displacement of the control valve 20 will be described with reference to FIG. 3. Accompanying drawings, Figure 3 is a view for explaining the flow rate change according to the switching of the control valve in the hydraulic circuit control device of a construction machine according to an embodiment of the present invention.

The control valve 20 determines the position of the spool according to the strength of the current value. As the spool of the control valve 20 moves, the flow direction of the hydraulic oil and the flow rate of the hydraulic oil change. That is, the flow path area varies according to the displacement of the spool. The flow path increases with a wide flow path area, and the flow rate decreases with a narrow flow path area.

Four flow paths may be formed in the control valve 20 by providing four ports. The first port A is connected to the first pump 11. The second port B is connected to the first control valve 31 for controlling the first travel motor 41. The third port C is connected to the second actuator group 52. The fourth port D is connected to the second pump 12.

The first flow path is a flow path connected from the first port A to the second port B. FIG. The second flow path is a flow path connected from the fourth port D to the third port C. FIG. That is, the first and second flow paths can be understood as flow paths when the control valve 20 is in an off state.

The third flow path is a flow path connected from the first port A to the third port C. FIG. The fourth flow path is a flow path connected from the fourth port D to the second port B. FIG. That is, the third and fourth flow paths can be understood as flow paths when the control valve 20 is in an on state.

3 shows the flow path area diagrams of the first, third and fourth flow paths, and it is possible to understand how the flow rates of the flow paths change as the displacement of the spool of the control valve 20 changes.

On the other hand, as shown in Figure 4, the hydraulic circuit control device for a construction machine according to an embodiment of the present invention may include an input unit 100, the control unit 400. The controller 400 may include a processor 200 and a performer 300.

The joystick 110 generates a first operation signal for operating the front work device 50.

The driving pedal 120 generates a second operation signal for operating the first and

second driving motors

41 and 42.

The input unit 100 receives a first operation signal for operating the front work device 50 and a second operation signal for driving. That is, only one of the first operation signal and the second operation signal may be input to the input unit 100, the other signal may be input after the input of one signal, and the first and second operations may be performed. All of the signals may be input.

If both the first operation signal and the second operation signal are input, the control unit 400 calculates a control value for controlling the control valve 20 based on the control map, and outputs the control value to the control valve 20. do.

The control unit 400 will be described in more detail as follows.

When both the first operation signal and the second operation signal are input, the processing unit 200 determines that the front work device operation is required while driving in the determination unit 210. The processor 200 calculates a control value for controlling the control valve 20 based on the control map 220.

Here, the control value may be understood as a current value to be applied to the control valve 20. That is, when the current value is maximum, the displacement of the spool of the control valve 20 may be maximum.

The output unit 300 outputs the control value calculated by the processing unit 200 to the control valve 20, whereby the control valve 20 may be controlled by the control value.

That is, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is controlled in accordance with the control map, so that when the operation of the front work device 50 is required, The area of the flow path may be increased such that a portion of the flow rate of the second pump 12 is provided to the front work device 50. This can advance the time at which the front work device 50 actually starts to operate.

In addition, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is controlled in accordance with the control map, so that the area of the third flow path is increased in proportion to that of the first flow path. When the area is reduced, the decreasing rate can be controlled to decrease at a slow rate. As a result, the driving speed can be prevented from suddenly decelerating and the shock can be prevented.

Meanwhile, when the control valve 20 is controlled, the flow rate discharged from the second pump 12 may be supplied to the first travel motor 41. As a result, the second pump 12 can supply the flow rate not only to the second travel motor 42 but also to the first travel motor 41, and in particular, to supply the flow rate to the first and

second travel motors

41 and 42 at the same time. This can improve the straight running performance.

On the other hand, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 40% to the maximum displacement at the operation time t0 of the front work device 50. The control value can be calculated to be 80%.

As described above, when the displacement of the spool of the control valve 20 is 40% or more with respect to the maximum displacement, a part of the discharge flow rate of the second pump 12 may be provided to the front work device 50 through the third flow path. A good flow rate is then provided so that the operation of the front tool can be smoothly implemented.

In addition, when the displacement of the spool of the control valve 20 is 80% or less with respect to the maximum displacement, the hydraulic oil is continuously provided to the first travel motor 41 through the first flow path, thereby rapidly reducing the traveling speed of the construction machine. It can prevent.

On the other hand, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 40 with respect to the maximum displacement at the operation time t0 of the front work device 50. The control value may be calculated to be from% to 65%. This allows the front work tool 50 to be operated in an optimized range that does not slow down the operation speed of the front work tool 50.

On the other hand, in the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is 55 with respect to the maximum displacement at the operation request time t0 of the front work device 50. The control value may be calculated to be from% to 75%. Here, if the displacement of the spool of the control valve 20 is 55% or more with respect to the maximum displacement, it can be tuned to improve the speed of the work machine. On the other hand, if the displacement of the spool of the control valve 20 is 75% or less with respect to the maximum displacement can be tuned to smoothly decelerate running.

A control map will be described with reference to FIG. 5. 5 is a view for explaining a control map for controlling the control valve in the hydraulic circuit control apparatus of a construction machine according to an embodiment of the present invention.

In the hydraulic circuit control apparatus of the construction machine according to the embodiment of the present invention, the control value is a predetermined slope (from the operation request time t0 of the front work device 50 to the time point t2 at which the displacement of the spool is maximum ( can be changed constantly to a). As a result, when the displacement of the spool of the control valve 20 is changed to the displacement to the maximum value, it is possible to prevent a sudden change, and furthermore, it is possible to control so that the running speed of the construction machine is smoothly reduced.

The above-mentioned predetermined inclination (a) may be set and shipped from the manufacturer, or may be newly set as desired.

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

Input step: A step of receiving a first operation signal for operating the front work device 50 or a second operation signal for driving. That is, when only the second operation signal is input, it may be determined that only driving is performed. However, when the first operation signal is input in a situation where the second operation signal is being input, it is intended to operate the front work device while driving. You can judge.

And to operate the joystick 110 to operate the desired actuator at this time the pilot pressure is generated. Therefore, whether the first operation signal is input may be determined based on whether a pilot pressure is formed in the pilot line. In addition, when the driving pedal 120 is pressed for the purpose of driving, a second operation signal is generated. The second operation signal can be known based on the on / off state of the control valve 20.

Calculation step: If it is determined whether the first operation signal and the second operation signal are all input, and it is determined that the first and second operation signals are being simultaneously input, the control value of the control valve 20 based on the control map. This is the step being calculated. That is, when it is determined that the front work device is operated while driving, the spool of the control valve 20 is controlled to change the area of the first, second, third and fourth flow paths. This may increase the flow rate provided to the front work device 50 at a specific point in time. The specific time point is a time t0 at which the operation of the front work device is required while driving.

Performing step: The control valve 20 is controlled according to the control value calculated in the calculating step. As a result, the control valve 20 may implement a specific displacement at a specific time point.

Therefore, in the hydraulic circuit control method of the construction machine according to the embodiment of the present invention, the displacement of the spool of the control valve 20 is controlled in accordance with the control map, at the time (t0) when the operation of the front work device 50 is required. A portion of the flow rate of the second pump 12 may be provided to the front work device 50. This can advance the time t1 at which the front work device 50 actually starts to operate.

In addition, in the hydraulic circuit control method for a construction machine according to an embodiment of the present invention, the displacement of the spool of the control valve 20 is controlled according to the control map, so that the area of the third flow path is increased in proportion to the increase of the area of the first flow path. When the area is reduced, the decreasing rate can be controlled to decrease at a slow rate. As a result, the driving speed can be prevented from suddenly decelerating and the shock can be prevented.

On the other hand, in the hydraulic circuit control method of the construction machine according to the embodiment of the present invention, at the operation request time t0 of the front work device 50, the control value is the displacement of the spool of the control valve 20 with respect to the maximum displacement The control value can be set to be 50% to 70%.

As a result, when a part of the discharge flow rate of the second pump 12 is provided to the front work device 50 through the third flow path, a good flow rate may be provided so that the operation of the front work device may be smoothly realized. By providing the operating oil to the first driving motor 41 through it, it is possible to prevent the running speed of the construction machine from being drastically reduced.

On the other hand, in the hydraulic circuit control method of the construction machine according to an embodiment of the present invention, the control value is a constant slope from the operation request time (t0) of the front work device 50 to the time point (t2) the displacement of the spool is maximum can be changed according to (a).

As a result, when the displacement of the spool of the control valve 20 is changed to the maximum displacement, it is possible to prevent a sudden change, and furthermore, it is possible to control the driving speed of the construction machine to be reduced smoothly.

Hereinafter, the operation and effect of the hydraulic circuit control device of a construction machine according to an embodiment of the present invention with reference to FIG. Accompanying drawings Figure 6 is a view for explaining the effect of the hydraulic circuit control device of a construction machine according to an embodiment of the present invention.

According to the first embodiment, the displacement of the spool gradually increases from the operation request time t0 of the front work device 50 to the time t2 at which the displacement of the spool spool becomes maximum. The flow rate discharged from the first pump 11 is distributed at the maximum flow rate to the first travel motor 41 and is hardly distributed to the front work device 50. The flow rate discharged from the second pump 12 is distributed at the maximum flow rate to the second travel motor 42 and is rarely distributed to the first travel motor 41.

Then the spool of the control valve 20 is moved so that the displacement of the spool increases to the extent that the operation of the front work device 50 can be started. That is, the operation start time t1 of the front work device 50 is after a predetermined time is delayed from the operation request time t0 of the front work device 50.

On the other hand, according to the first embodiment, at the operation start time t1 of the front work device 50, the flow rate distributed to the first travel motor 41 among the flow rates discharged from the first pump 11 is reduced, The flow rate distributed to the front tool 50 by the reduced flow rate is increased. In addition, the flow rate distributed to the second travel motor 42 among the flow rates discharged from the second pump 12 is reduced, and the flow rate distributed to the first travel motor 41 is increased by the reduced flow rate.

Therefore, according to the first embodiment, despite the short time t2 at which the displacement of the spool is maximized from the start time t1 of the operation of the front work device 50, the flow rate changes rapidly while driving. When the front work device 50 is operated, an impact may occur.

On the other hand, according to the second embodiment of the present invention, at the operation request time t0 of the front work device 50, the displacement of the spool starts from the starting displacement. The starting displacement may be a displacement in which the position of the spool has already moved much more than the initial displacement according to the first embodiment. And the displacement of the spool is gradually increased until the maximum from the starting displacement.

From the operation request time t0 of the front work device 50, the flow rate distributed to the first travel motor 41 among the flow rates discharged from the first pump 11 gradually decreases, and the front work device by the reduced flow rate. The flow rate dispensed to 50 is increased. The flow rate distributed to the second travel motor 42 among the flow rates discharged from the second pump 12 is gradually decreased, and the flow rate distributed to the first travel motor 41 is increased by the reduced flow rate.

That is, according to the hydraulic circuit control apparatus of the construction machine according to the second embodiment of the present invention, when the operation of the front work device 50 is required while driving, the flow rate discharged from the first pump 11 is the front work device ( 50), thereby facilitating the time t1 at which the operation of the front attachment 50 is actually started. Therefore, the start time t1 of operation of the front work device 50 may be the same time point or very close to the time point t0 of operation of the front work device 50.

On the other hand, according to the hydraulic circuit control device of the construction machine according to the second embodiment of the present invention, the time required from the start time (t1) of the operation of the front work device 50 to the time point (t2) when the displacement of the spool is maximum It is a relatively long time compared to Example 1. Therefore, since the change in flow rate proceeds for a relatively long time, the change in flow rate may be moderate, and further, the running speed may be prevented from being drastically reduced.

As mentioned above. The hydraulic circuit control device of the construction machine according to the second embodiment of the present invention is set so that the front work device is actually 40% to 80% of the maximum displacement of the spool displacement of the control valve 20 when traveling and work are simultaneously required. The time to start the operation can be advanced.

In addition, the hydraulic circuit control device of the construction machine according to the second embodiment of the present invention, by controlling the displacement of the spool of the control valve 20 to a constant inclination (a) can be alleviated the impact due to the running speed deceleration. .

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 can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the above-described embodiments 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 equivalent concepts. All changes or modifications which come out should be construed as being included in the scope of the present invention.

The hydraulic circuit control device of a construction machine according to an embodiment of the present invention can be used to prevent the start of operation of the front work device when the working device of the front is operated while the construction machine is running. have.

Claims

First and second pumps 11 and 12;

A first driving motor 41 receiving a flow rate discharged from the first pump 11;

A second driving motor 42 receiving a flow rate discharged from the second pump 12;

A front work device 50 receiving a flow rate discharged from the first pump 11 or the second pump 12;

A control valve 20 installed in a flow path between the first and second pumps 11 and 12 and the front work device 50;

A joystick (110) generating a first operation signal for operating the front work device (50);

A driving pedal 120 generating a second operation signal for operating the first and second driving motors 41 and 42; And

If both the first operation signal and the second operation signal are input, a control value for controlling the control valve 20 is calculated based on a control map, and the control value is output to the control valve 20. A control unit 400;

Hydraulic circuit control device for a construction machine comprising a.
The method of claim 1,

Supplying a flow rate discharged from the second pump 12 to the first travel motor 41 when the control valve 20 is controlled

Hydraulic circuit control device for a construction machine, characterized in that.
The method of claim 1,

The control valve 20 is such that the flow rate discharged from the first pump 11 and the flow rate discharged from the second pump 12 joins

Hydraulic circuit control device for a construction machine comprising a.
The method of claim 1,

The front work device (50) is a hydraulic circuit control device for a construction machine including a boom cylinder, arm cylinder and bucket cylinder.
The method of claim 1,

The control map,

The control value changes from a time point t0 at which the front work device 50 is operated to a constant slope from the time point t2 at which the displacement of the spool is maximized.

Hydraulic circuit control device for a construction machine, characterized in that.
The method of claim 1,

At the operation request time t0 of the front work device 50,

The control value being calculated such that the displacement of the spool of the control valve 20 is 40% to 80% of the maximum displacement

Hydraulic circuit control device for a construction machine, characterized in that.
The method of claim 1

At the operation request time t0 of the front work device 50,

The control value being calculated such that the displacement of the spool of the control valve 20 is 40% to 65% of the maximum displacement

Hydraulic circuit control device for a construction machine, characterized in that.
The method of claim 1,

At the operation request time t0 of the front work device 50,

The control value being calculated such that the displacement of the spool of the control valve 20 is 55% to 75% of the maximum displacement

Hydraulic circuit control device for a construction machine, characterized in that.
The method according to claim 1 or 6,

And said control value increases from said operation request time (t0) of said front work device (50) to a time point (t2) at which the displacement of said spool becomes maximum.
The method of claim 6,

Wherein the control value is changed to a constant inclination a from the operation request time point t0 of the front work device 50 to a time point t2 at which the displacement of the spool becomes maximum

Hydraulic circuit control device for a construction machine, characterized in that.