WO2024035094A1

WO2024035094A1 - Hydraulic control system for construction machines, and control method thereof

Info

Publication number: WO2024035094A1
Application number: PCT/KR2023/011715
Authority: WO
Inventors: 이성훈; 유윤규; 손원선; 정우용
Original assignee: 에이치디현대인프라코어 주식회사
Priority date: 2022-08-09
Filing date: 2023-08-09
Publication date: 2024-02-15

Abstract

The present invention relates to a hydraulic control system for construction machines and a control method thereof, the system comprising: a main pump driven by an engine provided in a construction machine; a fan pump supplying hydraulic oil to a cooling fan to cool the engine; and a controller (EPOS) provided to control the operation of the engine, the main pump, and the fan pump.

Description

Hydraulic control system for construction machinery and its control method

The present invention relates to a hydraulic control system for construction machinery, and more specifically, to a hydraulic control system for construction machinery that can quickly restore engine speed after disabling the auto-idle function of construction machinery.

Construction equipment has a function that lowers the engine speed to a set speed to reduce fuel efficiency and noise when it is idle for a set period of time. This is called the auto idle function.

When the auto idle function is released, the engine speed must rise to the initial setting level to start work again. At this time, the recovery time to increase the engine speed to the initial setting level is determined according to the dynamic characteristics of the engine and the load conditions of the equipment (main pump, fan pump).

If the recovery time to increase the engine speed to the initial setting level is slow, the worker may feel that the engine has no power, so it is important to recover the engine speed quickly.

In conventional construction equipment, no separate control function is added in the process of restoring the engine speed to the initial setting level after disabling the auto-idle function, so the engine speed recovery time is determined depending on the characteristics of the engine and pump.

Accordingly, when the dynamic characteristics of the engine are not good, the auto idle speed is set high to speed up the engine speed recovery time. In this case, the effect of improving fuel efficiency and noise when the auto idle function is activated is reduced. A problem arose that had to be dealt with.

The present invention is to control the operation of the main pump and fan pump to reduce the load on the main pump and fan pump after disabling the auto-idle function of the construction machine, so that the engine can quickly restore the initially set rotation speed. To provide a control system and its control method.

According to one embodiment of the present invention, the present invention includes a main pump driven by an engine provided in construction machinery; a fan pump supplying hydraulic oil to a cooling fan to cool the engine; and a controller (EPOS) provided to control the operation of the engine, the main pump, and the fan pump, wherein the controller is configured to automatically rotate the engine when the auto idle function of the construction machine is released. The operation of the fan pump is restricted so that the load on the fan pump is reduced for a set time to recover from the idle speed to the set speed setting value.

Additionally, the fan pump is driven by the engine.

Additionally, the controller does not restrict operation of the fan pump after the set time.

In addition, it further includes a fan pump control valve provided to limit the load of the fan pump, and the controller controls the fan pump control valve so that the load of the fan pump is below the set standard for a set time when the auto-idle function is released. Control the control value to the set minimum control value.

In addition, the controller operates to reduce the load on the main pump for a set time so that when the auto idle function of the construction equipment is released, the engine speed is restored from the auto idle speed to the set speed setting value. limit.

Additionally, a main pump control valve to limit the load of the main pump; and a pressure sensor that measures the discharge flow rate pressure of the main pump, wherein the controller stores a table for the maximum torque value according to the rotation speed of the engine, and the controller stores the discharge flow rate of the main pump and The torque value of the main pump is derived from the discharge flow pressure measurement value of the main pump, and when the auto idle function is released, the torque value of the main pump is lowered than the minimum torque value stored in the table during the set time. Adjust the control value of the control valve to the set control value.

Additionally, a gauge panel that transmits whether the auto idle function is on/off and the set rotation speed setting value to the controller; and a joystick pilot pressure sensor that detects the driver's joystick operation value and transmits it to the controller, wherein the controller determines whether the auto idle function is on/off and the auto idle function according to a work or driving signal of the construction machine. Executes or disables a function.

In addition, it includes a joystick pilot pressure sensor that detects the driver's joystick operation value and transmits it to the controller, and the controller limits the operation of the fan pump when the joystick operation value is above a certain standard.

In addition, the controller derives the torque value of the main pump from the discharge flow rate of the main pump and the discharge flow rate pressure measurement value of the main pump, and, when the torque value of the main pump is above a certain level, operates the fan pump. limit.

According to another embodiment of the present invention, the present invention includes the steps of inputting an off signal of the auto idle function while the auto idle function is being executed; And when the auto idle function is released, limiting the operation of the fan pump so that the load on the fan pump is reduced for a set time to restore the engine speed to the set speed setting value.

In addition, the step of restoring the engine speed to the set speed setting value limits the operation of the main pump so that the load on the main pump is reduced during the set time when the auto idle function is released.

Additionally, in the step of restoring the engine speed to the set speed setting value, if the joystick operation value is above a certain standard, the operation of the fan pump is restricted.

In addition, in the step of restoring the engine speed to the set speed setting value, the controller adjusts the control value of the fan pump control valve connected to the fan pump so that the load of the fan pump is below the set standard during the set time. Includes steps.

In addition, in the step of restoring the engine speed to the set speed setting value, the controller derives the discharge flow rate of the main pump; The controller deriving a torque value of the main pump using the discharge flow rate of the main pump and the pressure measurement value of the discharge flow rate of the main pump; And when the torque value of the main pump is above a certain value, operation of the fan pump is restricted.

In addition, in the step of restoring the engine speed to the set speed setting value, the controller derives the discharge flow rate of the main pump; The controller deriving a torque value of the main pump using the discharge flow rate of the main pump and the pressure measurement value of the discharge flow rate of the main pump; Comparing the torque value of the main pump derived by the controller with a previously stored table for maximum torque value according to engine speed; And the controller further includes a step of adjusting the control value of the main pump control valve connected to the main pump to the set control value so that the torque value of the main pump is reduced than the minimum torque value stored in the table during the set time.

In addition, before the step of restoring the engine speed to the set speed setting value, if a driving or work signal is not input from the joystick pilot pressure sensor for a set time after the off signal of the auto idle function is input, Maintains the auto idle function.

In addition, before the step of executing the auto idle function of the construction machine, a step of inputting an on signal of the auto idle function while the construction machine is working or driving; and a step of checking whether a work or driving signal is input from the joystick pilot pressure sensor during the set time.

Additionally, in the step of restoring the engine speed to the set speed setting value, the operation of the main pump and the fan pump is not restricted after the set time.

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

The hydraulic control system for construction machinery according to the present invention has the following effects.

First, the load on the fan pump and main pump is reduced by adjusting the output value of the valve that limits the load on the fan pump and main pump during the set time after disabling the auto idle function, and the engine speed quickly recovers to the set speed setting value. You can achieve the following effect.

Second, when the auto idle function is activated, there is no need to set the engine's standby speed to a high level, thereby improving fuel efficiency and reducing noise.

Figure 1 is a simplified diagram showing the configuration of a hydraulic control system for construction equipment according to an embodiment of the present invention.

2 and 3 are flow charts showing the control process of the hydraulic control system of construction equipment according to an embodiment of the present invention.

Figure 4 is a graph showing the process of changing engine speed according to the control method of the hydraulic control system of construction equipment according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Please note that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of parts in the drawings are shown exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are illustrative only and are not limiting. And for identical structural elements or parts that appear in two or more drawings, the same reference numerals are used to indicate similar features.

The embodiments of the present invention specifically represent ideal embodiments of the present invention. As a result, various variations of the diagram are expected. Accordingly, the embodiment is not limited to the specific shape of the illustrated area and also includes changes in shape due to manufacturing, for example.

Figure 1 shows the configuration of a hydraulic control system for construction equipment according to an embodiment of the present invention. Hereinafter, the configuration of the hydraulic control system of the construction equipment will first be described with reference to FIG. 1.

The hydraulic control system for construction equipment according to an embodiment of the present invention includes an engine 10, a main pump 20, a fan pump 30, a swash plate angle sensor 21, a pressure sensor 22, and a controller 40. Includes.

The engine 10 receives fuel and provides power to drive the construction machine. The power provided by the engine 10 is transmitted to the main pump 20.

The main pump 20 supplies hydraulic oil to attachments (not shown) such as booms and buckets provided in the construction machinery. The main pump 20 may be provided as one or more than one. The number of main pumps 20 varies depending on the attachment (not shown) provided on the construction machine.

The hydraulic pressure discharged from the main pump 20 is transmitted to the main control valve 70, and from the main control valve 70 to each attachment.

The fan pump 30 is driven by the engine 10. The fan pump 30 supplies hydraulic oil to operate a cooling fan (not shown) provided to cool the engine 10.

Meanwhile, the fact that the fan pump 30 is driven by the engine 10 is limited to this embodiment, and the fan pump 30 may not be driven by the engine 10, so it can be selectively applied. You can.

The swash plate angle sensor 21 is provided in the main pump 20. When a plurality of main pumps 20 are provided, each main pump 20 is provided with a swash plate angle sensor 21, so a plurality of swash plate angle sensors 21 are also provided. The swash plate angle sensor 21 measures the angle of the swash plate of the main pump 20. The swash plate angle measurement value measured by the swash plate angle sensor 21 is transmitted to the controller 40 and is used to derive the discharge flow rate of the main pump 20.

The pressure sensor 22 is provided in the main pump 20. Specifically, it is mounted on the discharge end where the flow rate is discharged from the main pump 20. The pressure sensor 22 measures the pressure formed by the flow rate discharged from the main pump 20. The pressure measurement value measured by the pressure sensor 22 is transmitted to the controller 40.

The controller 40 is provided to control the operation of the engine 10, the main pump 20, and the fan pump 30.

The controller 40 operates the main pump 20 for a set time so that the rotation speed of the engine 10 recovers from the auto idle rotation speed to the set rotation speed setting value when the auto idle function of the construction machine is released. and limiting the operation of the main pump 20 and the fan pump 30 so that the load of at least one of the fan pumps 30 is reduced. And after the set time, the operation of the main pump 20 and the fan pump 30 is not restricted. The process by which the controller 40 limits the main pump 20 and the fan pump 30 will be described in more detail later.

The hydraulic control system of the construction machine further includes a gauge panel 50, a joystick pilot pressure sensor 60, a main pump control valve 23, and a fan pump control valve 31.

The gauge panel 50 is provided in the cabin (not shown) of the construction machine. When the worker selects whether to turn on/off the auto idle function of the construction machine, the value is transmitted to the controller 40 through the gauge panel 50, and the set rotation speed setting value of the engine 10 is transmitted to the controller 40. can be input and transmitted to the controller 40.

The controller 40 executes or disables the auto idle function depending on whether the auto idle function is on/off and a work or driving signal of the construction machine.

The controller 40 utilizes information on whether the auto idle function is on/off and the rotation speed setting value of the engine 10 received from the gauge panel 50 to control the main pump 20. .

The joystick pilot pressure sensor 60 is provided on a joystick pilot line (not shown). The joystick pilot pressure sensor 60 detects the manipulation value when the operator operates the joystick (not shown) and transmits it to the controller 40. Specifically, when the operator operates the joystick (not shown) in any one of work, driving, neutral, and parking states, the manipulation value at this time is detected and transmitted to the controller 40.

The controller 40 can determine whether the auto idle function is maintained or the auto idle function is released according to the joystick manipulation value transmitted from the joystick pilot pressure sensor 60.

For example, when the controller 40 receives an on signal for the auto idle function from the gauge panel 50, it may not immediately execute the auto idle function. After receiving the on signal of the auto idle function from the gauge panel 50, the controller 40 confirms that no work or driving signal is input from the joystick pilot pressure sensor 60 for a set time. Then, the auto idle function is executed to control the rotation speed of the engine 10 to operate at the auto idle rotation speed.

Meanwhile, after receiving the off signal of the auto idle function from the gauge panel 50, the controller 40 does not receive a work or driving signal from the joystick pilot pressure sensor 60 for a set time. Maintains the auto idle function.

On the other hand, after receiving the off signal of the auto idle function from the gauge panel 50, the controller 40 receives a work or driving signal from the joystick pilot pressure sensor 60 for a set time. Disable the auto idle function.

In this way, the controller 40 receives signals from the gauge panel 50 and the joystick pilot pressure sensor 60 and controls the auto idle function of the engine 10.

In addition, when the auto-idle function is released by receiving an off signal of the auto-idle function, the controller 40 adjusts the operation value of the joystick according to the signal received from the joystick pilot pressure sensor 60. If it exceeds a certain standard, the operation of the fan pump 30 is restricted.

On the other hand, the controller 40 determines that the construction machine is in full operation when the torque value of the main pump 20 is high. Accordingly, the controller 40 limits the operation of the fan pump 30 when the torque value of the main pump 20 is above a certain value.

The main pump control valve 23 is provided between the controller 40 and the main pump 20. In this embodiment, the main pump control valve 23 is provided as an electronic proportional pressure reducing valve. The main pump control valve 23 limits the load of the main pump 20 according to a signal input from the controller 40.

In this embodiment, after the auto idle function of the construction machine is released, the main pump control valve is operated so that the load on the main pump 20 is reduced so that the engine 10's rotation speed quickly recovers to the set rotation speed setting value. (23) controls the operation of the main pump (20). The specific control process will be explained later.

The fan pump control valve 31 is provided between the controller 40 and the fan pump 30. The fan pump control valve 31 controls the load of the fan pump 30 according to a signal input from the controller 40.

In this embodiment, when the auto idle function of the construction machine is released, the fan pump control valve ( 31) controls the operation of the fan pump 30. The specific control process will be explained later.

When a construction machine is heavily loaded, such as with workpieces loaded on a bucket, it enters an auto-idle state when work is stopped for a moment. At this time, if you restart the interrupted task (full operation), the equipment will move slowly. As described above, reducing the load by limiting the operation of the fan pump 30 and the main pump 20 helps to quickly recover the RPM of the engine 10, allowing the worker to work at a high speed even after auto-idling. .

In this embodiment, the main pump control valve 23 and the fan pump control valve 31 are provided as electromagnetic proportional pressure reducing valves (EPPR valves). Therefore, the controller 40 applies the control values of the main pump control valve 23 and the fan pump control valve 31 as current values. Meanwhile, the main pump control valve 23 and the fan pump control valve 31 are not limited to electromagnetic proportional pressure reducing valves and may be changed in various ways depending on the environment.

Meanwhile, the hydraulic control system of the construction machine is provided with pump regulators (24, 32). The

pump regulators

24 and 32 are provided in each pump, that is, each main pump 20 and the fan pump 30.

The

pump regulators

24 and 32 set and adjust the pressure of the pump. The pump regulators (24, 32) are configured to operate the main pump ( 20) and adjust the angle of the swash plate of the fan pump 31. Accordingly, the main pump 20 and the fan pump 31 are limited so that the load is reduced.

Hereinafter, the control process of the hydraulic control system of construction equipment according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

First, the worker executes the auto idle function when he or she wants to temporarily stop working or driving the construction machine. At this time, an on signal for the auto idle function is input to the controller 40 from the gauge panel 50. (Step S210)

When an on signal for the auto idle function is input from the gauge panel 50, the controller 40 checks whether a work or driving signal is input from the joystick pilot pressure sensor 60 for a set time. (Step S215)

The step S215 is a step to check whether there has been no operation of the construction machine during the set time. Therefore, if no work or driving signal is input during the set time in step S215, the auto idle function is executed. (Step S220) At this time, the rotation speed of the engine 10 is converted to the auto idle rotation speed.

On the other hand, if a work or driving signal is input during the set time in step S215, it is determined that the auto-idle function is not executed and the auto-idle function is not executed.

While executing the auto-idle function, check whether an off signal for the auto-idle function is input from the user (step S225) or a work or driving signal is input from the joystick pilot pressure sensor 60 (step S230).

The controller 40 disables the auto idle function of the construction machine when an off signal for the auto idle function is input or a work or driving signal is input from the joystick pilot pressure sensor 60.

Meanwhile, the controller 40 maintains the auto idle function of the construction machine if no work or driving signal is input from the joystick pilot pressure sensor 60 even if an off signal for the auto idle function is input.

When the auto idle function is released, the rotation speed of the engine 10 must be restored to the set rotation speed setting value. At this time, the controller 40 reduces the load on one or more of the fan pump 30 and the main pump 20 so that the rotation speed of the engine 10 can be quickly restored to the set rotation speed setting value. (30) and limits the operation of the main pump (20). (Step S235)

In this embodiment, the load of both the fan pump 30 and the main pump 20 is limited.

The process of step S235 will be described in more detail with reference to FIG. 3.

The controller 40 limits the operation of the fan pump 30 when the auto idle function is released and the joystick operation value transmitted from the joystick pilot pressure sensor 60 exceeds a certain standard. The operation limit of the fan pump 30 specifically adjusts the control value of the fan pump control valve 31 to a set minimum control value so that the load of the fan pump 30 is below a set standard. (Step S310)

For example, when the load of the fan pump 30 becomes less than the set standard, it means that the speed (RPM) of the fan pump 30 becomes less than the set standard speed. That is, when the set minimum current value is applied to the fan pump control valve 31 and the speed (RPM) of the fan pump 30 is reduced accordingly, the load is reduced.

Meanwhile, when the auto idle function is released, the controller 40 may limit the operation of the fan pump 30 based on criteria other than the operation value of the joystick as described above.

The controller 40 receives the discharge flow rate pressure measurement value of the main pump 20 (step S321), and derives the discharge flow rate value of the main pump 20 (step S322). Then, the discharge flow rate pressure measurement value and The torque value of the main pump 20 is derived from the discharge flow rate value. (Step S323)

The controller 40 limits the operation of the fan pump 30 when the derived torque value of the main pump 20 is more than a certain value.

As described above, the control value of the fan pump control valve 31 is adjusted to the set minimum control value to limit the operation of the fan pump 30. This means that when the torque value of the main pump 20 is high, the controller 40 determines that the construction machine is in full operation and limits the operation of the fan pump 30.

Meanwhile, the controller 40 limits the operation of the main pump 20 so that the load on the main pump 20 is reduced when the auto idle function is released. (Step S330) To this end, the controller 40 first receives the swash plate angle measurement value of the main pump 20 from the swash plate angle sensor 21. (Step S331) Then, the pressure measurement value of the flow rate discharged by the main pump 20 is received from the pressure sensor 22. (Step S332)

The controller 40 derives the discharge flow rate value of the main pump 20 from the set rotation speed setting value of the engine 10 and the swash plate angle measurement value transmitted by the gauge panel 50. (Step S333) A set calculation formula or table for deriving the discharge flow rate of the main pump 20 may be stored in the controller 40. Therefore, the discharge flow rate value of the main pump 20 is derived by substituting the set rotation speed setting value and the swash plate angle measurement value into the set calculation formula or table. The setting calculation formula or table may be set in various ways by the manufacturer (designer) of the construction equipment and is therefore not specified.

And the torque value of the main pump 20 is derived from the derived discharge flow rate value and the pressure measurement value of the discharge flow rate. (Step S334)

The controller 40 stores a table of maximum torque values according to the rotation speed of the engine 10. The controller 40 compares the torque value derived in step S324 with the previously stored table.

The controller 40 controls the main pump 20 so that the torque value of the main pump 20 does not exceed the smallest torque value among the maximum torque values stored in the table. Specifically, the control value of the main pump control valve 23 is adjusted to the set control value so that the load of the main pump 20 can be reduced below the set standard. (Step S335) When the load of the main pump 20 is reduced below the set standard, the fan pump 30 similarly operates the main pump control valve ( 23), the set current value is applied. Accordingly, as the speed (RPM) of the main pump 20 decreases, the load on the main pump 20 decreases.

In this way, the controller 40 limits the operation of the main pump 20 and the fan pump 30 so that the load on the main pump 20 and the fan pump 30 is reduced as in step S235. The rotation speed of the engine 10 can be quickly restored to the set rotation speed setting value.

Figure 4 is a graph showing the process in which the engine speed changes due to the operation limit of the fan pump 30 and the main pump 20 when the auto idle mode is released after operating in the construction machine. As shown in FIG. 4, in a section where the construction machine operates at auto idle, the engine 10 rotates at auto idle speed. And when you try to start construction equipment work again, auto idle is released, the operation of the fan pump and main pump is restricted, and you can see that the engine speed quickly recovers as shown in area (A).

After the auto idle function is released, the construction machine operates the main pump 20 and the fan so that the load on the main pump 20 and the fan pump 30 is reduced by the controller 40 as described above. By limiting the operation of the pump 30, the set rotation speed setting value can be quickly recovered. In addition, by limiting the load of the main pump 20 and the fan pump 30, there is no need to increase the auto idle speed of the engine 10 when executing the auto idle function, thereby improving fuel efficiency of the construction equipment and The noise reduction effect can be maintained.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. will be.

Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the claims described later, and the meaning and scope of the claims and their equivalent concepts are derived from the meaning and scope of the claims and their equivalent concepts. All resulting changes or modified forms should be construed as falling within the scope of the present invention.

Claims

A main pump driven by an engine provided in construction equipment;

a fan pump supplying hydraulic oil to a cooling fan to cool the engine;

It includes a controller (EPOS) provided to control the operation of the engine, the main pump, and the fan pump,

The controller is,

When the auto idle function of the construction equipment is released, the operation of the fan pump is restricted so that the load on the fan pump is reduced for a set time so that the engine speed is restored from the auto idle speed to the set speed setting value. Hydraulic control system for construction machinery.
According to paragraph 1,

The fan pump is a hydraulic control system for construction equipment driven by the engine.
According to paragraph 1,

The controller is,

A hydraulic control system for construction equipment that does not restrict operation of the fan pump after the set time.
According to paragraph 1,

Further comprising a fan pump control valve provided to limit the load of the fan pump,

The controller is,

A hydraulic control system for construction equipment that adjusts the control value of the fan pump control valve so that the load of the fan pump is below a set standard for a set time when the auto idle function is released.
According to paragraph 1,

The controller is,

When the Auto Idle function of the construction equipment is released, the operation of the construction equipment is limited so that the load on the main pump is reduced for a set time so that the engine speed is restored from the auto idle speed to the set speed setting value. Hydraulic control system.
According to clause 5,

a main pump control valve to limit the load of the main pump; and

Further comprising a pressure sensor that measures the discharge flow pressure of the main pump,

The controller stores a table for the maximum torque value according to the rotation speed of the engine,

The controller is,

The torque value of the main pump is derived from the discharge flow rate of the main pump and the discharge flow rate pressure measurement value of the main pump, and when the auto idle function is released, the torque value of the main pump during the set time is the minimum torque stored in the table. A hydraulic control system for construction equipment that adjusts the control value of the main pump control valve to a set control value to reduce the value.
According to paragraph 1,

A gauge panel that transmits whether the auto idle function is on/off and the rotation speed setting value to the controller; and

It further includes a joystick pilot pressure sensor that detects the driver's joystick operation value and transmits it to the controller,

The controller is,

A hydraulic control system for construction equipment that executes or disables the auto-idle function depending on whether the auto-idle function is on/off and a work or driving signal of the construction machine.
According to paragraph 1,

It includes a joystick pilot pressure sensor that detects the driver's joystick operation value and transmits it to the controller,

The controller is a hydraulic control system for construction equipment that limits operation of the fan pump when the joystick operation value is above a certain standard.
According to paragraph 1,

The controller is,

Deriving a torque value of the main pump from the discharge flow rate of the main pump and the discharge flow pressure measurement value of the main pump,

A hydraulic control system for construction equipment that limits operation of the fan pump when the torque value of the main pump is above a certain value.
A step in which the auto idle function of the construction machine is executed;

inputting an off signal of the auto idle function while the auto idle function is being executed; and

When the auto idle function is released, the hydraulic control system of the construction equipment includes a step of limiting the operation of the fan pump so that the load on the fan pump is reduced during the set time and restoring the engine speed to the set speed setting value. Control method.
According to clause 10,

The step of restoring the engine speed to the set speed setting value,

A control method of a hydraulic control system for construction equipment that limits the operation of the main pump so that the load on the main pump is reduced for a set time when the auto idle function is released.
According to clause 10,

In the step of restoring the engine speed to the set speed setting value,

A control method of a hydraulic control system for construction equipment that limits operation of the fan pump when the joystick operation value is above a certain standard.
According to clause 12,

In the step of restoring the engine speed to the set speed setting value,

A control method of a hydraulic control system for construction equipment, comprising the step of a controller adjusting a control value of a fan pump control valve connected to the fan pump so that the load of the fan pump is below a set standard during a set time.
According to clause 10,

In the step of restoring the engine speed to the set speed setting value,

The controller deriving a discharge flow rate of the main pump;

The controller deriving a torque value of the main pump using the discharge flow rate of the main pump and the pressure measurement value of the discharge flow rate of the main pump; and

A control method of a hydraulic control system for construction equipment, further comprising limiting operation of the fan pump when the torque value of the main pump is greater than a certain value.
According to clause 11,

In the step of restoring the engine speed to the set speed setting value,

The controller deriving a discharge flow rate of the main pump;

The controller deriving a torque value of the main pump using the discharge flow rate of the main pump and the pressure measurement value of the discharge flow rate of the main pump;

Comparing the torque value of the main pump with a previously stored table for maximum torque value according to engine rotation speed; and

A hydraulic control system for construction equipment further comprising the step of adjusting the control value of the main pump control valve connected to the main pump to the set control value so that the torque value of the main pump is lowered than the minimum torque value stored in the table during the set time. control method.
According to clause 10,

Before the step of restoring the engine speed to the set speed setting value,

A control method of a hydraulic control system for construction equipment that maintains the auto-idle function if no driving or work signal is input from the joystick pilot pressure sensor for a set time after the off signal of the auto-idle function is input.
According to clause 10,

Before the auto idle function of the construction machine is executed,

Inputting an on signal for the auto idle function while working or driving the construction machine; and

A control method of a hydraulic control system for construction equipment, further comprising checking whether a work or driving signal is input from a joystick pilot pressure sensor during a set time.
According to clause 10,

In the step of restoring the engine speed to the set speed setting value,

A control method of a hydraulic control system for construction equipment that does not restrict the operation of the main pump and the fan pump after the set time.