KR20210149410A - Control method and control system for construction machinery - Google Patents

Abstract

A control method of a construction machine of the present invention allows an operation signal of a pilot cut-off switch for cutting off the supply of pilot working oil to be receieved in a state in which the construction machine is initiated. When the pilot cut-off switch receives the operation signal selected to be turned on to cut off the supply of the pilot working oil, the position of a smart key is determined after a preset time has elapsed. When the smart key is located outside a cabin of the construction machine, a safe mode is performed to prevent a person who does not possess the smart key from operating the construction machine. An objective of the present invention is to provide the control method of a construction machine capable of increasing the convenience of operation of the construction machine using a smart key.

Description

Control method and control system for construction machinery

The present invention relates to a method for controlling a construction machine and a control system for a construction machine. More particularly, it relates to a method for controlling a construction machine using a smart key system and a control system for a construction machine for performing the same.

A smart key system is built-in in construction equipment such as excavators, so that a user can open a door or turn on the engine while holding the smart key. However, when a driver in possession of the smart key leaves the vehicle after starting the engine for reasons such as engine preheating, anyone can operate the vehicle without the smart key, so there is a problem in that the risk of theft is very high.

One object of the present invention is to provide a method for controlling a construction machine that can increase the convenience of operation of the construction machine using a smart key.

Another object of the present invention is to provide a control system for a construction machine for performing the above-described control method.

In the method for controlling a construction machine according to exemplary embodiments for achieving the object of the present invention, an operation signal of a pilot cut-off switch for cutting off the supply of pilot hydraulic oil in a state in which the construction machine is started is applied. receive When the pilot cut-off switch receives an operation signal selected to be turned on to cut off the supply of the pilot hydraulic oil, the position of the smart key is determined after a preset time has elapsed. When the smart key is located outside the cabin of the construction machine, a safety mode is performed to prevent a person who does not possess the smart key from operating the construction machine.

In example embodiments, determining the location of the smart key may include transmitting a search signal from a smart key module and receiving a response signal corresponding to the search signal from the smart key.

In example embodiments, performing the safety mode may include controlling the pilot cut-off switch to be turned off by maintaining the pilot cut-off switch in an ON state.

In exemplary embodiments, determining the location of the smart key may be performed under a condition that a manipulation signal of a driving pedal is not input when the construction machine is a wheel type.

In example embodiments, the method may further include reducing a rotation speed of an engine to an auto idle engine speed when the smart key is located outside the cabin.

In example embodiments, the method may further include stopping the engine when a preset time elapses from when the rotation speed of the engine is reduced to the auto idle engine speed.

In exemplary embodiments, the method includes an operation signal in which the pilot cut-off switch is selected as an OFF state after reducing the rotation speed of the engine to the auto idle engine speed or after stopping the engine is received, determining the location of the smart key, and returning the rotation speed of the engine to the target rotation speed when the smart key is located inside the cabin of the construction machine.

A pilot cut-off switch for outputting an operation signal for cutting off the supply of pilot hydraulic oil to a control system of a construction machine according to exemplary embodiments for achieving another object of the present invention, and a location of a smart key according to a search signal When a selected operation signal is received with the pilot cut-off switch turned on while the engine is running, and the construction machine is started, the search signal is output after a preset time has elapsed to output the smart key Including a vehicle control device that detects the location of the vehicle and performs a safety mode that prevents anyone other than a driver who possesses the smart key from operating the construction machine when the smart key is located outside the cabin of the construction machine. do.

In example embodiments, the smart key module may transmit a search signal according to the search signal and receive a response signal corresponding to the search signal from the smart key.

In example embodiments, the vehicle control apparatus may control the pilot cut-off control valve to be turned off by maintaining the pilot cut-off switch in an ON state in the safety mode.

In example embodiments, when the construction machine is a wheel type, the vehicle control device may output the search signal under a condition that a driving pedal operation signal is not input.

In example embodiments, when the smart key is located outside the cabin, the vehicle control device outputs an auto idle control signal for reducing the rotation speed of the engine to the auto idle engine speed.

In example embodiments, the control system of the construction machine may further include an engine control device for reducing the rotation speed of the engine to the auto idle rotation speed according to the auto idle control signal.

In example embodiments, the vehicle control device may output an engine stop control signal for stopping the engine when a preset time elapses from when the auto idle control signal is output.

In example embodiments, after outputting the auto idle control signal or the engine stop control signal, the vehicle control device receives an operation signal in which the pilot cut-off switch is set to an OFF state, the search The position of the smart key is determined by outputting a signal, and when the smart key is located inside the cabin, an engine control signal for returning the rotation speed of the engine may be output.

According to exemplary embodiments, when a driver with a smart key leaves the cabin while the construction machine is started, an operation signal of the pilot cut-off switch is received, and the pilot cut-off switch is turned on ( ON) when the selected operation signal is received, the position of the smart key may be detected. When the smart key is located outside the cabin, a safe mode may be performed to prevent a person who does not possess the smart key from operating the construction machine.

In addition, when the smart key is located outside the cabin, it is possible to immediately enter the auto idle mode in which the engine rotation speed is reduced to the auto idle engine speed.

Accordingly, it is possible to prevent theft risk when the owner leaves the vehicle after starting the engine. In addition, when the vehicle owner leaves the cabin, it is possible to immediately enter the auto idle mode to minimize fuel consumption. Moreover, it is possible to minimize the battery consumption of the smart key by minimizing the number of times the smart key is detected while preventing the risk of theft.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a diagram illustrating a control system of a construction machine according to exemplary embodiments.
FIG. 2 is a block diagram illustrating a control system of the construction machine of FIG. 1 .
3 is a flowchart illustrating a method of controlling a construction machine according to exemplary embodiments.
4 is a flowchart illustrating detailed steps of the auto idle mode of FIG. 3 .
5 is a flowchart illustrating detailed steps of the engine stop mode of FIG. 3 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In each drawing of the present invention, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

In the present invention, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms and the text It should not be construed as being limited to the embodiments described in

That is, since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

1 is a diagram illustrating a control system of a construction machine according to exemplary embodiments. FIG. 2 is a block diagram illustrating a control system of the construction machine of FIG. 1 . Although the excavator is shown in FIG. 1 , the control system of the construction machine according to the exemplary embodiments is not limited to being used only in the excavator, and may be applied to industrial vehicles such as wheel loaders, forklifts, agricultural machinery, mining equipment, etc. have. Hereinafter, for convenience of description, only the excavator will be described.

Referring to FIG. 1 , the control system of the construction machine communicates with the smart key 200 to communicate with the smart key module 100 for performing the smart key function, and a pilot for outputting an operation signal for blocking the supply of pilot hydraulic oil. The cut-off switch 120 and the smart key module 100 and the pilot cut-off switch 120 are operably connected to a driver other than the driver who has the smart key 200 in a state in which the construction machine 10 is started. It may include a vehicle control device 130 to perform a safety mode that prevents other people from operating the construction machine 10 . In addition, the control system of the construction machine may further include an auto idle switch 110 , an engine control device 140 , and a pilot cut-off control valve 150 .

In exemplary embodiments, the construction machine 10 is installed on the lower traveling body 20 , the upper revolving body 30 mounted so as to be revolving on the lower traveling body 20 , and the upper revolving body 30 . It may include a cabin 50 and a front working device 60 .

The lower traveling body 20 supports the upper revolving body 30 and may drive the construction machine 10 such as an excavator by using the power generated from the engine. The lower traveling body 20 may be a crawler type traveling body including a caterpillar track as shown in FIG. 1 . Alternatively, the lower traveling body 20 may be a wheel type traveling body including traveling wheels. The wheel-type construction machine may include a driving pedal as a manipulation unit for driving the driving wheels.

The upper revolving body 30 has an upper frame 32 as a base, and can be rotated on a lower traveling body 20 on a plane parallel to the ground to set a working direction. The cab 50 may be installed on the left front portion of the upper frame 32 , and the front working device 60 may be mounted on the front portion of the upper frame 32 .

The front working device 60 may include a boom 70 , an arm 80 , and a bucket 90 . A boom cylinder 72 for controlling the movement of the boom 70 may be installed between the boom 70 and the upper frame 32 . An arm cylinder 82 for controlling the movement of the arm 80 may be installed between the boom 70 and the arm 80 . In addition, a bucket cylinder 92 for controlling the movement of the bucket 90 may be installed between the arm 80 and the bucket 90 . As the boom cylinder 72 , the arm cylinder 82 , and the bucket cylinder 92 extend or contract, the boom 70 , the arm 80 , and the bucket 90 may implement various movements, and the front working device 60 ) can perform several tasks. At this time, the boom cylinder 72 , the arm cylinder 82 , and the bucket cylinder 92 may be extended or contracted by the hydraulic oil supplied from the hydraulic pump.

In example embodiments, the smart key 200 is a FOB key of the smart key system, and information may be transmitted and received with the smart key module 100 . Transmission and reception of such information may be performed using at least one of radio signals such as a low frequency signal (LF) and a radio frequency (RF) signal.

The smart key 200 may have a configuration for transmitting a response signal in response to a search signal received from the smart key module 100 . For example, the search signal may be a low frequency (LF) signal (eg, 125 kHz), and the response signal may be a radio frequency (RF) signal (eg, 315 MHz, 433 MHz, etc.). The search signal may include information for requesting the authentication number, and the response signal may include information on an authentication number corresponding to the search signal.

When a control signal for controlling the construction machine is input, the smart key module 100 transmits the search signal for searching the smart key 200 around the smart key module 100 and The response signal may be received. The smart key module 100 may authenticate whether the registration authentication number included in the response signal matches the pre-stored registration authentication number. If the registration authentication number included in the response signal matches the registration authentication number, the smart key module 100 performs an operation such as unlocking the vehicle door, locking the vehicle door, and turning on the vehicle according to the received control signal. function can be performed.

In example embodiments, when a search signal is input from the vehicle control device 130 , the smart key module 100 may transmit a search signal for identifying the location of the smart key 200 .

For example, the smart key module 100 may include a plurality of antennas, and the antennas may have different reception sensitivities. The reception sensitivities of the antennas may have maximum reception distances at which a response signal from the smart key 200 can be received, respectively. Information including signals received by the antennas may be transmitted to the vehicle control device 130 . The vehicle control device 130 may determine the location of the smart key 200 based on the information transmitted from the antennas. Accordingly, the vehicle control device 130 may determine whether the smart key 200 is located inside or outside the cabin 50 .

Such a smart key module may be integrally formed with the vehicle control unit (VCU) 130 or the engine control unit (ECU) 140 for overall control of the construction machine, or may be provided in the form of a separate control unit.

In example embodiments, the pilot cut-off switch 120 may output an operation signal for cutting off the supply of pilot hydraulic oil.

For example, the pilot cut-off switch 120 may include a pilot cut-off lever. The pilot cut-off lever may have an ON state and an OFF state. When the pilot cut-off lever is selected to be in an ON state, the pilot hydraulic oil discharged from the pump may be controlled to be discharged directly to the drain tank, and accordingly, various control valves using the pilot hydraulic oil may lose their functions. have. When the pilot cut-off lever is selected to be in an OFF state, the pilot hydraulic oil may be provided to various control valves. Accordingly, the corresponding actuator may be normally operated according to the operator's manipulation signal.

In exemplary embodiments, the auto idle switch 110 senses the hydraulic pressure of each actuator of the construction machine operating according to the operation of the operation unit (eg, joystick), and the auto idle mode according to the sensed value You can control whether to enter or not.

When the sensed hydraulic pressure is less than a predetermined value for a preset time, the auto idle switch 110 determines that the actuator does not operate and sets the rotation speed of the engine 40 from the target rotation speed to a predetermined low rotation speed (auto idle engine speed). ) can generate an auto-idle entry signal for lowering.

When the vehicle control device 130 receives the auto idle entry signal, the vehicle control device 130 outputs an auto idle control signal to the engine control device 140 , and the engine control device 140 sets the rotation speed of the engine 40 to the auto idle engine. Auto idle mode can be performed by reducing the speed.

In exemplary embodiments, when the vehicle control device 130 receives an operation signal in which the pilot cut-off switch 120 is turned on while the engine 40 is being started, a preset time elapses. After that, the search signal is output to determine the location of the smart key 200, and when the smart key 200 is located outside the cabin 50, a person other than the driver who possesses the smart key 200 can use the construction machine ( 10) can be carried out in a safe mode to prevent it from working.

A driver holding the smart key 200 may leave the cabin 50 after lowering the pilot cut-off lever (switching the pilot cut-off switch to ON) after starting the engine for reasons such as engine preheating. . At this time, when the vehicle control device 130 detects the smart key 200 after a preset time has elapsed and determines that the smart key 200 is located outside the cabin 50, the safety mode may be performed. .

The vehicle control device may control the pilot cut-off control valve 150 to be turned off by maintaining the pilot cut-off switch in an ON state in the safety mode. Therefore, while the safety mode is being performed, even if another person who does not have the smart key performs an operation inside the cabin 50, the pilot hydraulic oil is directly discharged to the drain tank, and the construction machine does not operate.

In exemplary embodiments, when the construction machine is of the wheel type, when the pilot cut-off switch 120 is in an ON state and a selected operation signal is received, only in a condition in which the operation signal of the driving pedal is not input The search signal may be output.

In exemplary embodiments, when the vehicle control device 130 determines that the smart key 200 is located outside the cabin 50 , the auto idle control for reducing the rotation speed of the engine 40 to the auto idle engine speed A signal may be output to the engine control device 140 .

The engine control device 140 may minimize fuel consumption by reducing the rotation speed of the engine 40 to the auto idle rotation speed according to the auto idle control signal.

In exemplary embodiments, the vehicle control device 130 transmits an engine stop control signal for stopping the engine 40 when a preset time elapses from when the auto idle control signal is output to the engine control device 140 . can be printed on Here, the preset time may be several seconds or several minutes.

The engine control device 140 may minimize fuel consumption by stopping the engine 40 according to the engine stop control signal.

In exemplary embodiments, after outputting the auto idle control signal or the engine stop control signal, the vehicle control device 130 determines that the pilot cut-off switch 120 is set to an OFF state and the operation signal is selected. When received, the search signal is output to determine the position of the smart key 200 , and when the smart key 200 is located inside the cabin 50 , the rotation speed of the engine 50 is returned to the target rotation speed. It is possible to output an engine control signal and release the safety mode.

When the driver with the smart key 200 who has departed from the cabin 50 gets back into the cabin 50, the smart key 200 is detected and the smart key 200 is located inside the cabin 50. If it is determined, the engine rotation speed may be returned to the target rotation speed and the safety mode may be released.

In exemplary embodiments, when the construction machine is of the wheel type, when a manipulation signal selected in an OFF state of the pilot cut-off switch 120 is received, the operation signal of the driving pedal is input only when the operation signal is input. A search signal can be output.

Hereinafter, a method of controlling a construction machine using the control system of the construction machine of FIG. 2 will be described.

3 is a flowchart illustrating a method of controlling a construction machine according to exemplary embodiments. 4 is a flowchart illustrating detailed steps of the auto idle mode of FIG. 3 . 5 is a flowchart illustrating detailed steps of the engine stop mode of FIG. 3 .

1 to 5, first, in a state in which the construction machine is started, an operation signal of the pilot cut-off switch 120 is received (S100, S110), and the pilot cut-off switch 120 is turned ON. ), when the selected operation signal is received, the position of the smart key 200 may be determined after a preset time has elapsed (S120, S130).

In exemplary embodiments, when the pilot cut-off switch 120 is operated to an ON state to cut off the supply of pilot hydraulic oil while the engine 40 is started, the vehicle control device 130 may output a search signal for detecting the smart key 200 to the smart key module 100 after a preset time has elapsed.

When the search signal from the vehicle control device 130 is input, the smart key module 100 may transmit a search signal for locating the smart key 200 . When the search signal is received, the smart key 200 may transmit a response signal in response thereto.

For example, the smart key module 100 may include a plurality of antennas, and the antennas may have different reception sensitivities. The reception sensitivities of the antennas may have maximum reception distances at which a response signal from the smart key 200 can be received, respectively. Information including signals received by the antennas may be transmitted to the vehicle control device 130 . The vehicle control device 130 may determine the location of the smart key 200 based on the information transmitted from the antennas.

Then, when it is determined that the smart key 200 is located outside the cabin 50, a safety mode and auto idle mode that prevent a person who does not possess the smart key 200 from operating the construction machine 10 is performed. It can be (S140, S150). When the auto idle mode is performed for a preset time, the engine stop mode may be performed (S160).

In example embodiments, the vehicle control device 130 maintains the pilot cut-off switch 120 in an ON state in the safety mode to turn the pilot cut-off control valve 150 OFF. can be controlled Therefore, while the safety mode is being performed, even if another person who does not have the smart key performs an operation inside the cabin 50, the pilot hydraulic oil is directly discharged to the drain tank, and the construction machine does not operate.

When the construction machine is a wheel type, when the pilot cut-off switch 120 is turned on and a selected operation signal is received, the search signal may be output only under a condition in which the operation signal of the driving pedal is not input. .

In exemplary embodiments, when the vehicle control device 130 determines that the smart key 200 is located outside the cabin 50 , the auto idle control for reducing the rotation speed of the engine 40 to the auto idle engine speed A signal may be output to the engine control device 140 .

The engine control device 140 may minimize fuel consumption by reducing the rotation speed of the engine 40 to the auto idle rotation speed according to the auto idle control signal.

In exemplary embodiments, the vehicle control device 130 transmits an engine stop control signal for stopping the engine 40 when a preset time elapses from when the auto idle control signal is output to the engine control device 140 . can be printed on

The engine control device 140 may minimize fuel consumption by stopping the engine 40 according to the engine stop control signal.

As shown in FIG. 4 , a manipulation signal of the pilot cut-off switch 120 is received in a state in which the auto idle mode is entered (S151, S152), and the pilot cut-off switch 120 is turned on (OFF). When the selected manipulation signal is received, the location of the smart key 200 can be determined (S153, S154). When it is determined that the smart key 200 is located inside the cabin 50, the auto idle mode and the safe mode may be released (S155, S156).

In exemplary embodiments, when the pilot cut-off switch 120 is operated to an OFF state in order to supply the pilot hydraulic oil to various control valves using pilot hydraulic oil in the state in which the auto idle mode is entered , the vehicle control device 130 may output a search signal for detecting the smart key 200 to the smart key module 100 . The vehicle control device 130 may determine the location of the smart key 200 based on a response signal from the smart key 200 .

When it is determined that the smart key 200 is located inside the cabin 50, the vehicle control device 130 outputs an engine control signal for returning the rotation speed of the engine 50 to the target rotation speed and enters the safety mode. can be turned off

When the driver with the smart key 200 who has left the cabin 50 gets back into the cabin 50, the smart key 200 is detected, the engine rotation speed is returned to the target rotation speed, and the safety mode can be turned off.

In this case, when the construction machine is of the wheel type, when the pilot cut-off switch 120 is in the OFF state and a selected operation signal is received, the search signal is applied only when the operation signal of the driving pedal is input. can be printed out.

5, in the state in which the engine stop mode is entered, the operation signal of the pilot cut-off switch 120 is received (S171 and S172), and the pilot cut-off switch 120 is turned on (OFF). When the selected operation signal is received, the location of the smart key 200 can be determined (S173, S174). When it is determined that the smart key 200 is located inside the cabin 50, the engine stop mode and the safety mode may be released (S175 and S176).

In exemplary embodiments, when the pilot cut-off switch 120 is operated to an OFF state in order to supply the pilot hydraulic oil to various control valves using the pilot hydraulic oil in a state in which the engine stop mode is entered , the vehicle control device 130 may output a search signal for detecting the smart key 200 to the smart key module 100 . The vehicle control device 130 may determine the location of the smart key 200 based on a response signal from the smart key 200 .

When determining that the smart key 200 is located inside the cabin 50, the vehicle control device 130 outputs an engine control signal for re-operating the engine 50 to perform an Idle Stop Go (ISG) function and The safe mode can be turned off.

In this case, when the construction machine is of the wheel type, when the pilot cut-off switch 120 is in the OFF state and a selected operation signal is received, the search signal is applied only when the operation signal of the driving pedal is input. can be printed out.

As described above, when a driver with a smart key leaves the cabin while the construction machine is started, an operation signal of the pilot cut-off switch is received, and the pilot cut-off switch is turned on (ON). ) when the selected operation signal is received, the position of the smart key can be detected. At this time, when the smart key is located outside the cabin, a safe mode may be performed to prevent a person who does not possess the smart key from operating the construction machine.

In addition, if it is determined that the smart key is located outside the cabin, the auto idle mode can be entered immediately, in which the engine rotation speed is reduced to the auto idle engine speed, rather than after the existing predetermined idle time has elapsed.

Accordingly, it is possible to prevent theft risk when the owner leaves the vehicle after starting the engine. In addition, when the vehicle owner leaves the cabin, it is possible to immediately enter the auto idle mode to minimize fuel consumption. Moreover, it is possible to minimize the battery consumption of the smart key by minimizing the number of times the smart key is detected while preventing the risk of theft.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

10: construction machine 20: lower running body
30: upper slewing body 32: upper frame
40: engine 50: cabin
60: front working device 70: boom
72: boom cylinder 80: female
82: female cylinder 90: bucket
92: bucket cylinder 100: smart key module
110: auto idle switch 130: vehicle control device
140: vehicle control unit 150: pilot cut-off control valve
200: smart key

Claims (15)

receiving an operation signal of the pilot cut-off switch for cutting off the supply of pilot hydraulic oil in a state in which the construction machine is started;
when a selected operation signal is received so that the pilot cut-off switch is turned on to cut off the supply of the pilot hydraulic oil, the position of the smart key is determined after a preset time has elapsed; and
and, when the smart key is located outside the cabin of the construction machine, performing a safety mode to prevent a person who does not possess the smart key from operating the construction machine. The method of claim 1, wherein determining the location of the smart key comprises:
send a search signal from the smart key module; and
Control method of a construction machine comprising receiving a response signal corresponding to the search signal from the smart key. The method of claim 1 , wherein performing the safety mode comprises controlling the pilot cut-off switch to be turned off by maintaining the pilot cut-off switch in an ON state. The method of claim 1 , wherein determining the location of the smart key is performed under a condition in which an operation signal of a driving pedal is not input when the construction machine is a wheel type. The method of claim 1,
When the smart key is located outside the cabin, the control method of the construction machine further comprising reducing the rotation speed of the engine to the auto idle engine speed. 6. The method of claim 5,
The method of controlling a construction machine further comprising stopping the engine when a preset time elapses from when the rotation speed of the engine is reduced to the auto idle engine speed. 7. The method of claim 6,
After reducing the rotation speed of the engine to the auto idle engine speed or after stopping the engine, when a manipulation signal is received in which the pilot cut-off switch is turned OFF, the position of the smart key is determined; and
When the smart key is located inside the cabin of the construction machine, the control method of the construction machine further comprising returning the rotation speed of the engine to the target rotation speed. a pilot cut-off switch outputting an operation signal for cutting off the supply of pilot hydraulic oil;
a smart key module for determining the location of the smart key according to the search signal; and
When a selected operation signal is received with the pilot cut-off switch turned on while the construction machine is started, the search signal is output after a preset time elapses to determine the location of the smart key, and a vehicle control device configured to perform a safety mode that prevents anyone other than a driver who possesses the smart key from operating the construction machine when the smart key is located outside the cabin of the construction machine. The control system of claim 8, wherein the smart key module transmits a search signal according to the search signal and receives a response signal corresponding to the search signal from the smart key. The control system of claim 8 , wherein the vehicle control device controls to turn off the pilot cut-off control valve by maintaining the pilot cut-off switch in an ON state in the safety mode. The control system of claim 8 , wherein the vehicle control device outputs the search signal under a condition that an operation signal of a driving pedal is not input when the construction machine is a wheel type. The control system of the construction machine according to claim 8, wherein the vehicle control device outputs an auto idle control signal for reducing an engine rotation speed to an auto idle engine speed when the smart key is located outside the cabin. 13. The method of claim 12,
The control system of a construction machine further comprising an engine control device for reducing the rotation speed of the engine to the auto idle rotation speed according to the auto idle control signal. The control system of claim 12 , wherein the vehicle control device outputs an engine stop control signal for stopping the engine when a preset time elapses from when the auto idle control signal is output. 15. The method of claim 14, wherein, after outputting the auto idle control signal or the engine stop control signal, the vehicle control device receives the search signal when an operation signal in which the pilot cut-off switch is turned off is received. A control system of a construction machine that determines the position of the smart key by outputting it, and outputs an engine control signal for returning the rotation speed of the engine when the smart key is located inside the cabin.

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