阅读说明：本技术 工程机械及工程机械的控制方法 (Construction machine and control method for construction machine ) 是由 徐铉载 李浩荣 金敬根 于 2020-11-12 设计创作，主要内容包括：本发明的示例性的实施例的工程机械可以包括：感测所述工程机械的行驶速度的机构；工作模式选择机构,其选择所述工程机械的工作模式；变速器,其执行所述工程机械的2个档以上的变速；以及控制机构,其根据感测到的所述行驶速度和所选择的所述工作模式自动地控制所述变速器。(A work machine of an exemplary embodiment of the present invention may include: a mechanism that senses a travel speed of the construction machine; an operation mode selection unit that selects an operation mode of the construction machine; a transmission that performs a 2-speed or more gear change of the construction machine; and a control mechanism that automatically controls the transmission according to the sensed running speed and the selected operation mode.)

1. A work machine, comprising:

a mechanism that senses a travel speed of the construction machine;

an operation mode selection unit that selects an operation mode of the construction machine;

a transmission that performs a 2-speed or more gear change of the construction machine; and

a control mechanism that automatically controls the transmission according to the sensed travel speed and the selected operating mode.

2. The work machine of claim 1,

the working mode selection mechanism comprises a working mode and a running mode,

when the working mode of the construction machine is an operation mode, the control mechanism controls the transmission in a manner of being fixed to first gear.

3. The work machine of claim 1,

the working mode selection mechanism comprises a working mode and a running mode,

when the work mode of the construction machine is a running mode, the control mechanism automatically controls the transmission according to the sensed running speed.

4. The work machine of claim 1,

the working mode selection mechanism comprises a working mode, a running mode and an automatic mode,

when the work mode of the construction machine is an automatic mode, the control mechanism automatically controls the transmission according to the work state of the working machine of the construction machine and the sensed running speed.

5. A working machine according to claim 1, characterized by comprising:

an automatic shift mode selection mechanism capable of selecting an automatic shift mode by a user.

6. A working machine according to claim 5,

the automatic shift mode selection mechanism is located inside a cabin of the construction machine.

7. A working machine according to claim 1, characterized by comprising:

a shift lever that selects one of a low-speed mode and a high-speed mode to perform shifting of the transmission; and

an automatic shift mode selection mechanism capable of selecting an automatic shift mode by a user,

when the shift lever is operated in a state in which an automatic shift mode is selected by the automatic shift mode selection mechanism, the control mechanism executes respective corresponding shift modes on the transmission in accordance with the operation of the shift lever.

8. A working machine according to claim 1, characterized by comprising:

a shift lever that selects one of a low speed mode, a high speed mode, and an automatic shift mode to perform shifting of the transmission.

9. A working machine according to claim 1, characterized by comprising:

a shift lever that selects 2 or more gear positions to perform shifting of the transmission,

the control mechanism performs shifting of the respective corresponding gear positions on the transmission in accordance with operation of the shift lever.

10. A work machine, comprising:

a mechanism that senses a travel speed of the construction machine;

an operation mode selection means for selecting an operation mode including an operation mode and a travel mode of the construction machine;

a shift lever that selects one of a low speed mode, a high speed mode, and an automatic shift mode to perform shifting of the transmission;

a transmission that performs a 2-speed or more gear change of the construction machine; and

a control mechanism that automatically controls the transmission according to the sensed travel speed, the selected operating mode, and the selected signal of the shift lever.

11. A control method for a construction machine for automatically shifting a travel mode of the construction machine between a low-speed travel mode and a high-speed travel mode, the control method comprising:

an action of sensing a traveling speed of the construction machine;

an action of performing a gear change of the transmission according to the sensed running speed;

judging the action of the current working mode of the engineering machinery; and

and when the current working mode is a running mode, automatically executing the speed change action on the speed change device according to the sensed running speed.

Technical Field

The present invention relates to an engineering machine and a control method for an engineering machine.

Background

A construction machine such as an excavator can perform not only traveling by the power of an engine but also work such as excavation by a front working device such as a bucket.

Generally, a construction machine can travel in three travel modes, which are a low-speed travel mode (first gear), a high-speed travel mode (second gear), and an automatic transmission travel mode.

The operator can select the shift mode by the shift lever, and when the operator selects the high-speed or low-speed mode, the operator shifts gears in the selected shift mode. Further, when the automatic shift mode is selected, the shift is automatically performed from the low speed to the high speed in accordance with the running speed.

A construction machine is provided with a working device such as a bucket, and thus can not only travel but also perform work, and requires a higher rotational force at the time of work than at the time of travel.

However, if the automatic shift mode is selected, the torque required for the work cannot be sufficiently ensured by simply performing the shift according to the traveling speed, and therefore, the work efficiency is lowered.

Disclosure of Invention

Technical problem

The present invention has been made to solve the above problems, and an object of the present invention is to provide a construction machine and a control method for a construction machine, which improve work efficiency by speed change control.

Technical scheme

An exemplary embodiment of the present invention provides a working machine, which may include: a mechanism that senses a travel speed of the construction machine; an operation mode selection unit that selects an operation mode of the construction machine; a transmission that performs a 2-speed or more gear change of the construction machine; and a control mechanism that automatically controls the transmission according to the sensed running speed and the selected operation mode.

Preferably, the operation mode selection means includes an operation mode and a travel mode, and the control means may control the transmission so as to be fixed to first gear when the operation mode of the construction machine is the operation mode.

Preferably, the operation mode selection means may include a work mode and a travel mode, and the control means automatically controls the transmission according to the sensed travel speed when the operation mode of the construction machine is the travel mode.

Preferably, the work mode selection means may include a work mode, a travel mode, and an automatic mode, and when the work mode of the working machine is the automatic mode, the control means automatically controls the transmission according to an operation state of a working machine of the working machine and the sensed travel speed.

Preferably, the working machine may include: an automatic shift mode selection mechanism capable of selecting an automatic shift mode by a user.

Preferably, the automatic shift mode selection mechanism may be located inside a cabin of the working machine.

Preferably, the working machine may include: a shift lever that selects one of a low-speed mode and a high-speed mode to perform shifting of the transmission; and an automatic shift mode selection mechanism capable of selecting an automatic shift mode by a user, the control mechanism executing respective corresponding shift modes on the transmission in accordance with an operation of the shift lever when the shift lever is operated in a state in which the automatic shift mode is selected by the automatic shift mode selection mechanism.

Preferably, the working machine may include: a shift lever that selects one of a low speed mode, a high speed mode, and an automatic shift mode to perform shifting of the transmission.

Preferably, the working machine may include: a shift lever that selects 2 or more gear positions to perform shifting of the transmission, the control mechanism performing shifting of the transmission in respective corresponding gear positions in accordance with an operation of the shift lever.

An exemplary embodiment of the present invention provides a working machine, which may include: a mechanism that senses a travel speed of the construction machine; an operation mode selection means for selecting an operation mode including an operation mode and a travel mode of the construction machine; a shift lever that selects one of a low speed mode, a high speed mode, and an automatic shift mode to perform shifting of the transmission; a transmission that performs a 2-speed or more gear change of the construction machine; and a control mechanism for automatically controlling the transmission according to the sensed running speed, the selected operation mode and the selected signal of the shift lever.

An exemplary embodiment of the present invention provides a control method of a construction machine for automatically shifting a travel mode of the construction machine between a low speed travel mode and a high speed travel mode, the control method of the construction machine may include: an action of sensing a traveling speed of the construction machine; an action of performing a gear change of the transmission according to the sensed running speed; judging the action of the current working mode of the engineering machinery; and an operation of shifting the transmission so as to be fixed in the low-speed mode when the current operation mode is the operation mode.

An exemplary embodiment of the present invention provides a control method of a construction machine for automatically shifting a travel mode of the construction machine between a low speed travel mode and a high speed travel mode, the control method of the construction machine may include: an action of sensing a traveling speed of the construction machine; an action of performing a gear change of the transmission according to the sensed running speed; judging the action of the current working mode of the engineering machinery; and an action of automatically performing gear shifting on the gear shifting device according to the sensed running speed when the current operation mode is a running mode.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the exemplary embodiments of the present invention, even in the case where the automatic shift mode is set, it is possible to use a high rotational force according to the current operation mode, thereby having an effect of improving the working efficiency.

Drawings

Fig. 1 is a diagram schematically showing a construction machine according to an exemplary embodiment of the present invention.

Fig. 2 is a block diagram illustrating a working machine according to an exemplary embodiment of the present invention.

Fig. 3 is a diagram showing a shift lever and an operation mode selection mechanism of a construction machine according to an exemplary embodiment of the present invention.

Fig. 4a and 4b are diagrams illustrating an operation mode selection mechanism of a construction machine according to an exemplary embodiment of the present invention.

Fig. 5 is a sequence diagram schematically illustrating a control method of a construction machine according to an exemplary embodiment of the present invention.

Reference numerals

120: sensing mechanism, 121: running state sensing mechanism, 122: motion state sensing mechanism, 210: selector lever, 220: operation mode selection mechanism, 230: automatic shift mode selection mechanism, 260: vehicle control unit, 270: control mechanism, 300: a transmission.

Detailed Description

Hereinafter, for convenience of explanation, some embodiments of the present invention will be described with reference to the accompanying exemplary drawings. When reference is made to a component of each drawing, the same component is denoted by the same reference numeral as much as possible even when the component is denoted by different drawings.

The terms or words used in the present specification and claims should not be limited to general or dictionary meanings, but should be interpreted as meanings and concepts conforming to the technical idea of the present invention on the basis of the principle that the inventor can appropriately define the concept of the terms in order to describe his own invention in an optimal way. In the description of the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. Such terms are only used to distinguish one constituent element from another constituent element, and the nature, order, sequence, or the like of the constituent elements is not limited by the terms. When a description is made that a certain component is "connected" or "coupled" to another component, it is to be understood that the component may be directly connected or coupled to the other component, but another component may be "connected" or "coupled" to the other component.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferable embodiments of the present invention and do not represent all the technical ideas of the present invention, and therefore, it should be understood that various equivalents and modifications that can replace the embodiments may be possible at the time of the present application. In addition, detailed descriptions of well-known functions and configurations which may unnecessarily obscure the gist of the present invention are omitted.

A shift control device for a construction machine according to various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a diagram schematically illustrating a construction machine according to an exemplary embodiment of the present invention, fig. 2 is a block diagram illustrating a construction machine according to an exemplary embodiment of the present invention, fig. 3 is a diagram illustrating a shift lever 210 and an operation mode selection mechanism 220 of a construction machine according to an exemplary embodiment of the present invention, and fig. 4a and 4b are diagrams illustrating an operation mode selection mechanism 220 of a construction machine according to an exemplary embodiment of the present invention.

Referring to fig. 1, the working machine according to various embodiments of the present disclosure may include a wheel excavator traveling using wheels, but is not limited thereto, and may include other working machines traveling using wheels.

A wheeled excavator may include an engine, a hydraulic pump, a travel motor, a transmission, axles, and wheels. The engine may start the hydraulic pump and discharge the working oil through the hydraulic pump. The hydraulic pump can supply hydraulic pressure to the working machine cylinder and the travel motor.

The travel motor may be driven by hydraulic oil of the hydraulic pump to generate power for travel of the construction machine. The travel motor may control a rotation direction for forward/backward, and control a rotation speed by hydraulic pressure. The travel motor may be a variable capacity type in which a volume is adjusted by a capacity control valve.

The transmission can shift the running power in accordance with the running speed of the construction machine. The running power after the gear change may be transmitted to the wheels through the axle.

In the construction machine, the front working device may be disposed in front of the vehicle. The front working device may include a bucket, but is not limited thereto, and may include a crusher (breaker), a crusher (crucher), a shearer (shear), and the like, which are capable of performing various works.

Such a working device such as a bucket may be driven by a drive mechanism such as a bucket cylinder and a boom cylinder, and such a drive mechanism may be actuated by the hydraulic pressure of the hydraulic pump.

Hereinafter, such a bucket and drive mechanism may be described as a work machine. The work machine can sense whether or not to operate by the various sensing mechanisms 120 provided in the construction machine.

Referring to fig. 2 to 4b, the working machine according to the exemplary embodiment of the present invention may include a sensing mechanism 120, an operation mode selection mechanism 220, a transmission 300, and a control mechanism 270. Further, a shift lever 210 that performs shifting of the transmission 300 may be included.

The sensing mechanism 120 may include a travel state sensing mechanism 121 that senses a travel state of the work machine and/or an action state sensing mechanism 122 that senses an action state of the work machine. In one embodiment, the driving state sensing mechanism 121 may sense a driving speed or a torque of the work machine. The running state sensing means 121 may automatically sense the running speed and/or torque of the vehicle while the vehicle is running, and transmit the sensed values to the vehicle control unit 260. Such a running state sensing means 121 may include a sensor using ultrasonic waves, laser light, microwaves, or the like.

In one embodiment, the motion state sensing mechanism 122 may be provided on one side of a working machine of the work machine, such as a bucket or a bucket cylinder. The motion state sensing mechanism 122 may be provided to the bucket or the bucket cylinder and sense an angle change or a movement displacement of the bucket, and transmit the sensed amount of change to the vehicle control unit 260. The control unit 270 can determine the operating state of the working machine by the amount of angle change or the displacement of the working machine.

The operating mode selection mechanism 220 may be disposed adjacent to the shift lever 210 within the cabin, however, in one embodiment, the operating mode selection mechanism 220 may include a mode switch as shown in FIG. 4a, and in another embodiment, may include a mode shift lever as shown in FIG. 4 b. However, the present invention is not limited to this embodiment.

In one embodiment, the operation mode selection mechanism 220 may be configured to enable selection of the operation mode or the travel mode by an operator.

In one embodiment, the operation mode selection mechanism 220 may be provided in a form such as a switch or a joystick in such a manner that the operation mode, the travel mode, or the automatic mode can be selected. In this case, each operation mode may be selected by one switch or one lever, but the present invention is not limited thereto, and a switch or a lever for selecting an automatic mode may be separately provided and disposed on one side of the cabin.

In the present invention, the work mode and the travel mode of the construction machine can be selected by the work mode selection means 220.

Further, in an embodiment, an automatic mode may be selected that can automatically select a work mode and a travel mode by recognizing a current operation state of the construction machine. When the operator selects the automatic mode in the operation mode selection means 220, the operator can determine the operation mode or the travel mode based on the current operation state of the working machine attached to the construction machine. For example, the operation mode may be determined by sensing a change in the angle of the bucket by the bucket and/or the operation state sensing means 121 provided in the bucket, and determining the operation mode based on the sensed angle of the bucket.

The forward and/or reverse of the construction machine can be selected by the operation of the shift lever 210. Further, the shift lever 210 can select a manual shift mode (low speed mode, high speed mode) and an automatic shift mode.

The shift lever 210 can select 2 or more gear positions to perform shifting of the transmission. In one embodiment, when the user operates the shift lever 210 to a low speed mode among the manual shift modes, it is possible to fixedly travel at a low speed (first gear). In this case, the rotation speed of the travel motor can be controlled to a low speed, and a relatively high rotation force can be obtained.

In one embodiment, when the user operates the shift lever 210 to a high speed mode among the manual shift modes, it is possible to fixedly travel at a high speed (second gear). In this case, the traveling motor can be controlled to a high speed and a low rotational force with respect to the first gear.

In one embodiment, when the user operates the shift lever 210 in the automatic shift mode, the shift from the first gear to the second gear may be automatically performed according to the traveling speed of the construction machine.

According to various embodiments, when the automatic transmission mode is selected, the transmission 300 may be controlled according to the operating mode of the work machine. Specifically, when the work machine is currently operating in the travel mode, the automatic shifting may be performed according to the travel speed, and when the work machine is currently operating in the work mode, the shifting may be performed by the control mechanism 270 in a fixed low speed, i.e., first gear.

In one embodiment, the work machine may include an automatic transmission mode selection mechanism 230. The automatic shift mode selection mechanism 230 may be provided separately from the shift lever 210, but is not limited thereto, and the automatic shift mode selection mechanism 230 may be provided on one side of the shift lever 210. That is, the automatic shift mode selection mechanism 230 may be disposed inside the cabin. The user can select the automatic shifting mode through the automatic shifting mode selecting mechanism 230. When the automatic shift mode is selected by the operation of the automatic shift mode selection mechanism 230, the shift from the first gear to the second gear may be automatically performed according to the traveling speed of the construction machine. However, even in the case of performing automatic shifting, when the operation of the shift lever 210 by the user is sensed by the vehicle control device VCU260, shifting to the shift mode selected by the shift lever 210 can be performed by the control mechanism 270. That is, the shift is executed by preferentially applying the operation signal of the shift lever 210.

For example, when the user selects the running mode to the first low gear by the operation of the shift lever 210 during the automatic shift by the automatic shift mode selection mechanism 230, the control mechanism 270 may perform the shift to the first gear with respect to the transmission 300. Further, when the user selects the running mode to the high speed (second gear) by the operation of the shift lever 210, the transmission 300 can perform the shift to the second gear by the control mechanism.

In the present invention, by providing the single automatic shift mode selection mechanism 230, the user who is familiar with the operation of the shift lever 210 of the manual transmission 300 can use the automatic transmission 300 without discomfort, and can perform shifting by preferentially reflecting the operation of the shift lever 210 whenever necessary, thereby improving the convenience of the user of the manual transmission 300 in operating the construction machine.

The transmission 300 may be connected to be capable of transmitting power to an output side (not shown) of the running motor. Here, it may be described as a clutch disc type speed changing device that transmits power generated by a travel motor to a gear portion of the speed changing device through a plurality of friction discs, but is not limited thereto.

An input shaft (not shown) of the transmission 300 may be connected to an output side of the running motor, and may be selectively connected to an output shaft (not shown) that is advanced or retracted by a clutch-type operating mechanism. A planetary gear (not shown) for changing the speed of the low speed (first gear) and the high speed (second gear) may be coupled to the output shaft. Thus, the first gear and the second gear can be shifted in forward and reverse directions, respectively. Here, it may be described as the second gear, but is not limited thereto, and the gear shift may be performed at a vehicle speed of 2 or more gears.

The work machine of an exemplary embodiment of the present disclosure may include a control mechanism 270. The control mechanism 270 may be a transmission control unit 270 (TCU). The control means 270 may control the gear shift of the transmission 300 according to the traveling speed of the construction machine sensed by the traveling state sensing means 121 and the operation mode of the construction machine selected by the operation mode selecting means 220.

For example, when the work mode or the travel mode is selected by the work mode selection means 200, the vehicle control unit 260 may determine the current work mode of the construction machine as the work mode or the travel mode. Further, when the automatic mode is selected, the vehicle control unit 260 may automatically determine the work mode or the travel mode through the result sensed by the action state sensing mechanism 122.

In an exemplary embodiment, it is judged that the current operation mode of the construction machine is, when the construction machine is in the travel mode, the gear shift into the first gear, the second gear, or the automatic gear shift mode according to the operation signal of the shift lever 210 may be controlled. In the automatic shift mode, it may be controlled to automatically shift according to the running speed sensed by the running state sensing mechanism 121.

Further, it is judged that the current operation mode of the construction machine is the working mode, and when the construction machine is the working mode, the first gear or the second gear may be selected according to the operation signal of the shift lever 210, and the shift may be performed with the selected first gear or the second gear.

However, when the operation mode of the construction machine is the working mode and the automatic shift mode is selected according to the operation of the shift lever 210, the control mechanism 270 may perform shift control to use a high rotation speed in such a manner that the transmission 300 is fixed to the first gear.

The determination of the operation mode may be performed by the vehicle control unit 260 according to the operation signal of the operation mode selection mechanism 220 described above. When the user operates the operation mode selection mechanism 220 to select the operation mode, the vehicle control unit 260 may determine that the construction machine is currently in the operation mode. In the work mode, the work of the work machine can be performed by the user's operation of the operation lever of the work machine.

Further, when the user operates the operation mode selection means 220 to select the travel mode, the vehicle control unit 260 may determine that the current operation mode of the construction machine is the travel mode. In the travel mode, for safety, even if the user operates the operation lever of the working machine, the work of the working machine may not be performed.

In one embodiment, the user may operate the operating mode selection mechanism 220 to select the automatic mode. When the automatic mode is selected, the vehicle control unit 260 may determine the operation mode of the construction machine by an operation signal of the working machine.

Specifically, the work signal of the work machine may include the signal of the above-described operation state sensing mechanism 122. By sensing such an operation signal, when the working machine is currently operating, the operation mode of the construction machine can be determined as the operation mode, and in this case, even if the automatic shift mode is currently selected, shift control can be performed in a fixed first-speed manner to ensure a high rotational force.

Further, if the work machine is not currently operated by sensing the operation signal, the operation mode of the construction machine can be determined as the travel mode, and in this case, the shift control can be performed in response to the operation signal of the shift lever 210.

Thus, even when the work is performed while moving in a short distance, the gear shift can be performed, and the work efficiency can be improved.

Fig. 5 is a sequence diagram schematically illustrating a control method of a construction machine according to an exemplary embodiment of the present invention.

A method of controlling a construction machine according to an exemplary embodiment of the present invention will be described below with reference to fig. 5.

In act 510, a current traveling speed of the construction machine may be sensed by the traveling state sensing mechanism 121, and the traveling speed of the vehicle is judged by the vehicle control unit 260 to perform the gear shift control in the automatic gear shift mode.

In act 520, the operating mode and the shift mode may be sensed by the vehicle control unit. Specifically, the automatic mode may be selected by a user through the automatic mode selection mechanism 220 while the work machine is in operation. In the present invention, the work mode, the travel mode, and the automatic mode can be selected.

In the present invention, a low speed (first gear) and a high speed (second gear) can be selected as the manual shift mode, and an automatic shift mode can be selected. In one embodiment, the automatic shift mode may be selected by operation of the automatic shift mode selection mechanism 230 in addition to operation of the shift lever 210.

In act 530, the current operation mode of the work machine may be determined by the determination vehicle control unit 260 by sensing an operation signal of the operation mode selection mechanism 220. In one embodiment, when the automatic mode is selected, the current operation mode may be automatically judged by the vehicle control unit according to a sensing signal of the working machine.

Thereafter, shifting can be performed according to the user's operation of the shift lever 210. In the present invention, the shifting of the transmission 300 may be controlled by the control mechanism 270 according to the current operation mode of the construction machine judged by the vehicle control unit.

Specifically, when the current operation mode of the construction machine is determined as the work mode in act 530, the gear shift mode may be determined in act 540. For example, when it is determined as the work mode in act 530 through the selection of the work mode, the manual shift mode may be selected according to the operation of the shift lever 210, and the shift may be performed at the selected vehicle speed in the manual shift mode.

Alternatively, when the operation mode of the construction machine is determined to be the working mode, the automatic shift mode may be selected in accordance with the operation of the shift lever 210, and in this case, in act 550, the control means 270 may perform shift control so as to fix the transmission 300 to the first gear, thereby controlling the operation to enable the use of a high rotation speed.

On the other hand, when it is judged in act 530 that the current operation mode of the construction machine is the driving mode through the selection of the operation mode, the transmission 300 may be controlled to be shifted to the first gear, the second gear, or the automatic shift mode according to the shift mode sensed through the operation of the shift lever 210.

In one embodiment, when the automatic mode is selected, the vehicle control unit 260 may determine the operation mode of the working machine through an operation signal of the working machine. For example, when a change in the angle of the current working machine is sensed, the operation mode of the working machine may be determined as the working mode, and in this case, even if the current automatic shift mode is selected in order to secure a high rotational force, the shift control may be performed in such a manner that the first gear is fixed as shown in act 550.

Further, upon sensing the operation signal, for example, when a change in the angle of the current working machine is not detected, it may be determined that there is no operation of the working machine at present, and the operation mode of the construction machine may be determined as the travel mode. In this case, the shift control can be performed in response to the operation signal of the shift lever 210 as in the above-described operation 560.

The actions described above may be performed in sequence as shown in fig. 5, but are not limited thereto.

As described above, the construction machine according to various embodiments of the present invention may selectively adopt the manual shift mode and the automatic shift mode, and may control the shift according to the current operation mode of the construction machine, thereby improving the efficiency of driving.

In an embodiment, even in the case where the automatic shift mode is selected, when the construction machine is currently in the working mode, the shift control may be performed in such a manner that the transmission 300 is fixed to the first gear, thereby using a high rotational force, thereby improving the efficiency of the work.

It is not intended that the present invention be limited to the above-described embodiments, since all the components constituting the embodiments of the present invention are described as being combined into one or operated as one. That is, all the components may be selectively combined into one or more components and operated without departing from the object scope of the present invention. In addition, unless otherwise stated to the contrary, the terms "including", "constituting" or "having" described above mean that the constituent element may be included, and thus should be interpreted as including other constituent elements as well, without excluding other constituent elements. Unless otherwise defined, all terms including technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms commonly used as terms defined in dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present disclosure.

The above description is only an exemplary illustration of the technical idea of the present invention, and a person having ordinary skill in the art to which the present invention pertains can make various modifications and variations within the scope not departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed herein are intended to illustrate the technical idea of the present invention, and not to limit the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited to these embodiments. The scope of the invention should be construed by the claims that follow, and all technical ideas within the range of equivalents thereof should be construed to fall within the scope of the claims of the invention.