KR20170014767A - Engine mode system for working machine and method of contrling thereof - Google Patents

Abstract

The present invention relates to an engine mode system and a control method of a work machine, the engine mode selection unit including a power mode in which an engine is driven at a maximum output and a fuel consumption reduction mode in which the engine is driven at a fuel efficiency reduction output; A first sensing unit for sensing a workload applied to the work device; A second sensing unit for sensing operation of the work device; And setting the predetermined load value according to a fuel consumption reduction mode signal received from the fuel consumption reduction mode, and when the working load of the working device is equal to or greater than the set load value and the working device is operated, And the engine is automatically switched to the power mode so as to be driven to the maximum output.

Description

TECHNICAL FIELD [0001] The present invention relates to an engine mode system and a control method for a work machine,

The present invention relates to an engine mode system and method of a work machine.

A variety of working machines are used at work sites such as construction sites or civil engineering sites. Work machines will have appropriate mechanical structure and performance for each type of work such as roads, rivers, harbors, railways, and plants. That is, due to the diversity of work performed in the industrial field, the working machine can be classified into excavation equipment, loading equipment, conveying equipment, loading equipment, compaction equipment, foundation equipment and the like, specifically, wheel loaders, excavators, forklifts, Trucks, rollers, and so on.

The working machine is divided into an infinite track type and a tire type according to the driving method, and it can be divided into an engine type operated by using a fossil fuel such as an electric type and a diesel type, have.

Such a work machine is provided with an engine mode operating system consisting of a power mode, a standard mode and an economy mode, and the engine mode switch ) To set one of the engine modes, it is possible to optimize the machine's performance according to the type of work, thereby reducing fuel consumption.

That is, the driver can select the power mode only at the time of the work requiring the maximum output and select the standard mode or the economy mode at the time of the other work, thereby reducing the fuel consumption of the working machine.

However, in the process of selecting and operating the standard mode or the economy mode by the driver, the maximum output is required momentarily, and the efficiency of the operation is deteriorated due to the lack of output of the working machine.

The driver who has such experience has to work mostly by choosing the power mode even in an environment that can operate as a standard mode or an economy mode. Therefore, there is a problem that the purpose of fuel economy reduction using the engine mode system can not be efficiently achieved. Research is underway.

Korean Patent Publication No. 10-2011-0037048 (published on April 13, 2011)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide an apparatus and a method for selecting a standard mode or an economy mode, And to provide an engine mode system and a control method of a work machine that can prevent a reduction in work efficiency.

An engine mode system of a working machine according to an aspect of the present invention includes an engine mode selection unit including a power mode in which an engine is driven at a maximum output and a fuel consumption reduction mode in which the engine is driven with a fuel consumption reduction output; A first sensing unit for sensing a workload applied to the work device; A second sensing unit for sensing operation of the work device; And setting the predetermined load value according to a fuel consumption reduction mode signal received from the fuel consumption reduction mode, and when the working load of the working device is equal to or greater than the set load value and the working device is operated, And the engine is automatically switched to the power mode so as to be driven to the maximum output.

Specifically, when the work device is not operated regardless of the work load of the work device in the process of performing work in the work device by the power mode that has been automatically switched, And automatically returning to the fuel economy mode so that the engine is driven to the fuel economy reduction output.

Specifically, the fuel economy reduction mode includes a standard mode in which the engine is driven as a primary output; And an economy mode in which the engine is driven to a minimum output.

Specifically, the predetermined load value is a maximum load value in which the working device can work with optimized performance in the standard mode when the fuel consumption reduction mode is the standard mode, , It may be the maximum load value that the working device can work with optimized performance in the economy mode.

Specifically, the first sensing unit may be installed in each of the work device boom cylinder and the bucket cylinder.

Specifically, the second sensing unit may be installed in each of the boom and the bucket of the working apparatus.

Specifically, the second sensing unit may be installed on a working device operation lever provided in a cab.

A control method of an engine mode system of a working machine according to another aspect of the present invention is characterized in that the control unit receives an engine mode signal from the standard mode or the economy mode selected from among a power mode, a standard mode, and an economy mode, Setting a predetermined load value according to a signal; If the control unit determines that the work load of the work device sensed by the first sensing unit is equal to or greater than the preset load value and that the operation of the work device is sensed by the second sensing unit, Automatically switching the economy mode to the power mode so as to drive the engine to a maximum output; And the control unit automatically returning the automatically switched power mode to the first selected standard mode or the economy mode, and controlling the engine to be driven to a basic output or a minimum output.

Specifically, the predetermined load value may be a maximum load value in which, when the standard mode is selected, the working device can work with the optimized performance in the standard mode.

Specifically, the predetermined load value may be a maximum load value at which the working device can work with optimized performance in the economy mode when the economy mode is selected.

The engine mode system and the control method of a working machine according to the present invention are characterized in that when a work requiring a maximum output is detected in the course of working with a work device by selecting a standard mode or an economy mode, So that it is possible to prevent a reduction in work efficiency due to a lack of output of the engine.

In addition, the engine mode system and the control method of a work machine according to the present invention are characterized in that, in the course of working with a work device by an automatically switched power mode, when an operation requiring no maximum output is detected, By restricting to the standard mode or the economy mode, it is possible to efficiently reduce fuel consumption.

1 is a configuration diagram of an engine mode system of a work machine according to an embodiment of the present invention.
2 is a perspective view of a working machine managed by an engine mode system of a working machine according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling an engine mode system of a work machine according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

FIG. 1 is a configuration diagram of an engine mode system of a work machine according to an embodiment of the present invention, and FIG. 2 is a perspective view of a work machine managed by an engine mode system of a work machine according to an embodiment of the present invention.

Prior to describing the engine mode system 100 of a work machine in accordance with an embodiment of the present invention, reference is first made to FIG. 2 to describe the operation of an engine mode system 100 of a work machine according to an embodiment of the present invention The machine 200 will now be described.

2, the work machine 200 may be a wheel loader or the like. Of course, the working machine 200 may be a variety of equipment such as an excavator, a forklift, a bulldozer, a truck, a roller, and the like, but is not limited to a wheel loader. It should be understood, however, that the present invention is not limited to the embodiment but is merely an example.

The working machine 200 includes a working device 210, a traveling device 220, and a body 230.

The work device 210 implements the task. At this time, the work may mean various tasks such as lifting the material or climbing the ground. The working device 210 may include a boom 211, a bucket 212, and the like.

The boom 211 is provided on the body 230 and the movement of the boom 211 can be performed by a boom cylinder 2111 operated by hydraulic pressure. The boom cylinder 2111 may be configured as a pair so that both sides of the boom 211 and the body 230 are connected to each other.

The bucket 212 lifts the material. The bucket 212 can have a basket shape and can form a space for accommodating a material therein.

The bucket 212 may be loaded with the material by a bucket cylinder 2112 which operates hydraulically and may be stably lifted or the material may be poured into the floor, dump truck or the like.

Of course, the bucket 212 in the working device 210 can be replaced with a breaker or the like. That is, the work device 210 is not limited to the above, and may be changed depending on the type of work.

The traveling device 220 includes a plurality of wheels 221 and implements movement of the work machine 200. If the working machine 200 is a wheel loader, it can move through the traveling device 220 having the two axles and the four wheels 221.

The body 230 may include a cab 240 and an engine room 250.

The operator's seat 241 can be provided with a driver's seat 241 on which a driver of the working machine 200 can sit and can be operated, An accelerator pedal (not shown), a cluster (not shown), etc., as well as a handle 242, various levers 243, a brake pedal 244, and the like.

The engine room 250 may be provided with an engine 251 so as to transmit driving force to the working device 210 and the traveling device 220.

Hereinafter, an engine mode system 100 for efficiently reducing fuel consumption when the work machine 200 described above is performed at a certain work site will be described.

1, an engine mode system 100 of a working machine according to an embodiment of the present invention includes an engine mode selection unit 110, a first sensing unit 120, a second sensing unit 130, (140).

The engine mode selection unit 110 may be provided in the cab 240. The driver may select the output of the engine 251 to optimize the machine performance according to the type of work or the working environment, To the control unit 140. [

The engine mode selection unit 110 may include a power mode 111, a standard mode 112, and an economy mode 113. Here, the standard mode 112 and the economy mode 113 can be collectively referred to as a fuel consumption reduction mode. Also, in the case of collectively referred to as the fuel economy reduction mode, among the terms used below, the basic output and the minimum output may be collectively referred to as fuel economy saving output, and the standard mode signal and the economy mode signal may be collectively referred to as the fuel consumption reduction mode signal.

The power mode 111 is a mode in which when the work type or work environment is difficult and rough, for example, when a workload such as a hard digging operation is performed on the work device 210, ) Can be selected to be driven at the maximum output. When the driver selects the power mode 111, the controller 140 drives the engine 251 to the maximum output according to the power mode signal.

In the power mode 111, since the engine 251 is driven with the maximum output even when the working device 210 does not need the maximum output, the fuel consumption is unnecessarily large.

The power mode 111 can be selected or canceled by the driver, or can be automatically selected or canceled by the control unit 140, which will be described later.

Specifically, when the driver selects the standard mode 112 or the economy mode 113 to be described later and selects the first and second sensing units 120 and 130 to be described later, The first selected standard mode 112 to be described later or the economy mode 113 to be described later is automatically switched to the power mode 111 by the control unit 140 to be described later, (251) is driven to the maximum output. In this case, the power mode 111 may be automatically selected, and the standard mode 112 or a later-described economy mode 113, which will be described later, may be automatically released.

In the course of the operation of the work unit 210 by the automatically switched power mode 111, a work condition requiring no maximum output is detected by the first and second sensing units 120 and 130 to be described later The automatically switched power mode 111 is automatically returned to the standard mode 112 to be described later or the economy mode 113 to be described later by the control unit 140 to be described later so that the engine 251 can output the basic output It is driven by the fuel-saving output. In this case, the power mode 111 may be automatically released, and the standard mode 112 or a later-described economy mode 113, which will be described later, may be automatically restored to the initial state.

The standard mode 112 is a mode in which when the work type or the work environment is normal and the work load is performed in the work device 210, for example, a general digging job, ) Can be selected to be driven by the default output. When the driver selects the standard mode 112, the controller 140 causes the engine 251 to be driven as the basic output according to the standard mode signal.

In the standard mode 112, since the engine 251 is driven by the primary output, the fuel consumption can be reduced to the maximum output.

The above-described standard mode 112 can be selected or canceled by the driver, or can be automatically released or restored by the control unit 140, which will be described later.

Specifically, when the driver selects the standard mode 112 and proceeds to work with the work unit 210, a work condition requiring a maximum output is detected by the first and second sensing units 120 and 130 to be described later The standard mode 112 is automatically switched to the power mode 111 by the control unit 140 to be described later so that the engine 251 is driven at the maximum output. In this case, the standard mode 112 may be automatically released, and the power mode 111 may be automatically selected.

In the course of the operation of the work unit 210 by the automatically switched power mode 111, a job which does not need the maximum output is detected by the first and second sensing units 120 and 130 to be described later , The automatically switched power mode 111 is automatically returned to the first selected standard mode 112 by the control unit 140 to be described later so that the engine 251 is driven as the basic output. In this case, the standard mode 112 can be said to be automatically returned to the initial state, and the power mode 111 can be said to be automatically released.

The economy mode 113 is a mode in which the driver operates the engine 251 when the work type or work environment is good, for example, when performing a workload with a small work load, such as a general loading operation, ) Can be selected to be driven with the minimum output. When the driver selects the economy mode 113, the controller 140 causes the engine 251 to be driven to the minimum output according to the economy mode signal.

In the economy mode 113, since the engine 251 is driven with the minimum output, the fuel consumption can be reduced as much as possible.

The economy mode 113 can be selected or canceled by the driver, or can be automatically released or restored by the control unit 140, which will be described later.

More specifically, when the driver selects the economy mode 113 and proceeds to work with the work unit 210, a work condition requiring a maximum output is detected by the first and second sensing units 120 and 130 The economy mode 113 is automatically switched to the power mode 111 by the control unit 140 to be described later so that the engine 251 is driven at the maximum output. In this case, the economy mode 113 may be automatically released, and the power mode 111 may be automatically selected.

In the course of the operation of the work unit 210 by the automatically switched power mode 111, a job which does not need the maximum output is detected by the first and second sensing units 120 and 130 to be described later The automatically switched power mode 111 is automatically returned to the initially selected economy mode 113 by the control unit 140 to be described later so that the engine 251 is driven to the minimum output. In this case, the economy mode 113 can be said to be automatically returned to the initial state, and the power mode 111 can be said to be automatically released.

The first sensing unit 120 senses a workload applied to the work unit 210 when the work unit 210 performs an operation and outputs the sensed first sensing signal to the control unit 140 to be described later in real time .

Specifically, the first sensing unit 120 senses a workload applied to at least one of the boom 211 and the bucket 212, and can provide the first sensing signal to the controller 140 to be described later in real time The boom cylinder 2111, and the bucket cylinder 2112, respectively.

The second sensing unit 130 senses the operation of the working device 210 when the working device 210 performs an operation and provides the sensed second sensing signal to the control unit 140 to be described later in real time have.

Specifically, the second sensing unit 130 senses whether at least one of the boom 211 and the bucket 212 of the work unit 210 is operating, and transmits a second sensing signal to the controller 140, which will be described later, And may be installed in each of the boom 211 and the bucket 212 or may be installed in a working device operation lever 243 provided in the cab 240. [

The control unit 140 sets a predetermined load value according to the engine mode signal received from the engine mode selection unit 110 and outputs the first and second sensing signals to the first and second sensing units 130, It is possible to control the increase / decrease of the output of the engine 251 by comparing the calculated first and second sensed signal values with predetermined load values.

Specifically, when the driver selects the power mode 111 of the engine mode selection unit 110, the control unit 140 can control the engine 251 to be driven to the maximum output according to the power mode signal. At this time, the controller 140 does not set the predetermined first load value.

When the driver selects the standard mode 112 of the engine mode selection unit 110, the control unit 140 can control the engine 251 to be driven as the basic output according to the standard mode signal. At this time, the controller 140 sets a predetermined first load value according to the standard mode signal.

The predetermined first load value stored in the controller 140 may be the maximum load value at which the working device 210 can work with the optimized performance in the standard mode 112. [ The first load value may serve as a reference value for determining the level of the first sensing signal calculated as the load value in the controller 140 by the first sensing signal provided from the first sensing unit 120 . That is, the first load value and the first sensed signal value are set such that the first selected standard mode 112 is automatically switched to the power mode 111 or the automatically switched power mode 111 is returned to the first selected standard mode 112 The control unit 140 can determine whether or not the user is allowed to do so.

Also, when the driver selects the economy mode 113 of the engine mode selection unit 110, the control unit 140 can control the engine 251 to be driven to the minimum output according to the economy mode signal. At this time, the control unit 140 sets a predetermined second load value according to the economy mode signal.

The predetermined second load value stored in the control unit 140 may be a maximum load value at which the working device 210 can work with the optimized performance in the economy mode 113. [ The second load value may serve as a reference value for determining the level of the first sensing signal calculated as the load value in the controller 140 by the first sensing signal provided from the first sensing unit 120 . That is, the second load value and the first sensed signal value may be set such that the first selected economy mode 113 is automatically switched to the power mode 111, or the automatically switched power mode 111 is returned to the first selected economy mode 113 The control unit 140 may be a second condition for judging whether or not the control unit 140 can determine whether to perform the operation.

The control unit 140 provides the first sensing signal sensed by the first sensing unit 120 that senses a workload applied to the working device 210 in real time when the working device 210 performs an operation (When the driver selects the standard mode) or a predetermined second load value (when the driver selects the economy mode), the first sensing signal value calculated as the load value is calculated as the load value, ) In real time.

The first sensed signal value is compared with a predetermined first or second load value to automatically switch the initially selected standard mode 112 or economy mode 113 to the power mode 111, The control unit 140 can determine whether to switch the switched power mode 111 to the first selected standard mode 112 or the economy mode 113. The first or second condition can be determined.

The control unit 140 receives the second sensing signal sensed by the second sensing unit 130 that senses the operation of the working device 210 in real time when the operation device 210 performs an operation, The second sensing signal value may be generated when the apparatus 210 is operating or when the working apparatus operating lever 243 is operated.

The second sensed signal value is used to determine whether the initially selected standard mode 112 or economy mode 113 is automatically switched to the power mode 111 or the automatically switched power mode 111 is set to the initially selected standard mode 112 or economy mode 111, The control unit 140 can determine whether to return to the first mode 113 or the third condition.

As described above, the control unit 140 can control the increase / decrease of the output of the engine 251 according to a combination of the first condition and the third condition or a combination of the second condition and the third condition.

Specifically, when the driver selects the standard mode 112 and proceeds to work with the work unit 210, the control unit 140 determines whether the first sensing signal value by the first sensing unit 120 is greater than a predetermined first If it is determined that the second sensing signal value by the second sensing unit 130 is generated (if it is determined that the first condition and the third condition are satisfied), the first selected standard mode 112 is set to the power mode (111) so that the engine (251) can be controlled to be driven to the maximum output. In this case, the standard mode 112 may be automatically released, and the power mode 111 may be automatically selected.

The control unit 140 controls the operation of the work unit 210 by the automatically switched power mode 111 so that the first sensing signal value by the first sensing unit 120 is lower than the predetermined first load If it is determined that the second sensing signal value is not generated by the second sensing unit 130 (at least one of the first condition and the third condition is not satisfied) regardless of the value or more, The switched power mode 111 is automatically returned to the initially selected standard mode 112 so that the engine 251 can be controlled to be driven as the primary output. In this case, the standard mode 112 can be said to be automatically returned to the initial state, and the power mode 111 can be said to be automatically released.

When the driver selects the economy mode 113 and proceeds to work with the work unit 210, the control unit 140 determines that the first sensing signal value by the first sensing unit 120 is greater than the predetermined second load (If it is determined that the second condition and the third condition are satisfied), it is determined that the first selected economy mode 113 is the power mode ( 111) so that the engine 251 can be controlled to be driven to the maximum output. In this case, the economy mode 113 may be automatically released, and the power mode 111 may be automatically selected.

The control unit 140 controls the operation of the operation unit 210 by automatically switching the power mode 111 so that the first sensed signal value by the first sensing unit 120 is greater than a predetermined second load If it is determined that the second sensing signal value by the second sensing unit 130 is not generated (if it is determined that at least one of the second condition and the third condition is not satisfied) The converted power mode 111 can be automatically returned to the first selected economy mode 113 and the engine 251 can be controlled to be driven to the minimum output. In this case, the economy mode 113 can be said to be automatically returned to the initial state, and the power mode 111 can be said to be automatically released.

Hereinafter, a method of controlling the engine mode system 100 of the work machine 200 according to an embodiment of the present invention will be described with reference to FIG.

3 is a flowchart illustrating a method of controlling an engine mode system of a work machine according to an embodiment of the present invention.

3, the control method of the engine mode system 100 of the working machine 200 according to an embodiment of the present invention is such that the control unit 140 controls the power mode 111, the standard mode 112, (S310) of receiving the engine mode signal from the standard mode 112 or the economy mode 113 selected from the economy mode 113 and setting a predetermined load value according to the engine mode signal, , If it is confirmed that the work load of the work device 210 sensed by the first sensor 120 is equal to or higher than a predetermined load value and the operation of the work device 210 is sensed by the second sensor 130 A step S320 of automatically switching the first selected standard mode 112 or the economy mode 113 to the power mode 111 so as to drive the engine 251 to the maximum output in step S320, The power mode 111 is first selected in the standard mode 112 or economy (113), and controlling the engine (251) to be driven to the basic output or the minimum output (S330).

In step S310, the control unit 140 receives the engine mode signal from the standard mode 112 or the economy mode 113 selected from the power mode 111, the standard mode 112 and the economy mode 113, Set a predetermined load value according to the mode signal.

In the above, the predetermined load value may be the maximum load value at which the working device 210 can work with the optimized performance in the standard mode when the standard mode 112 is selected.

In addition, the predetermined load value may be the maximum load value in which the working device 210 can work with optimized performance in the economy mode when the economy mode 113 is selected.

In step S320, the control unit 140 determines whether the work load of the work unit 210 sensed by the first sensing unit 120 is equal to or greater than a predetermined load value, The control unit 200 automatically switches the standard mode 112 or the economy mode 113 to the power mode 111 and controls the engine 251 to be driven at the maximum output.

The workload sensed by the first sensing unit 120 may be a workload applied to at least one of the boom 211 and the bucket 212 of the work unit 210. [

The control unit 140 performs step S320 so that the standard mode 112 or the economy mode 113 is automatically released and the power mode 111 is automatically selected.

In step S330, the control unit 140 automatically resets the automatically switched power mode 111 to the first selected standard mode 112 or the economy mode 113 and controls the engine 251 to be driven to the primary output or the minimum output do.

The control unit 140 performs step S320 so that the standard mode 112 or the economy mode 113 is automatically returned to the initial state and the power mode 111 is automatically released.

In this way, according to the present embodiment, when a work requiring a maximum output is detected in a process of selecting the standard mode 112 or the economy mode 113 and working with the work device 210, the first selected standard mode 112 or economy Mode 113 is automatically switched to the power mode 111, it is possible to prevent a work safety accident and a work efficiency from being lowered due to insufficient output of the engine 251. [

In this embodiment, when a work requiring no maximum output is detected in the process of working with the work device 210 by the automatically switched power mode 111, the automatically switched power mode 111 is selected as the first selected standard Mode 112 or the economy mode 113 so that the fuel consumption can be efficiently reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be apparent to those skilled in the art that various combinations and modifications may be made without departing from the scope of the present invention. Therefore, it should be understood that the technical contents related to the modifications and applications that can be easily derived from the embodiments of the present invention are included in the present invention.

100: engine mode system 110: engine mode selection unit
111: Power mode 112: Standard mode
113: Economy mode 120: First sensing unit
130: second sensing unit 140:
200: work machine 210: work machine
211: Boom 2111: Boom cylinder
212: bucket 2112: bucket cylinder
220: Travel device 221: Wheel
230: body 240: cab
241: driver's seat 242: handle
243: lever 244: brake pedal
250: engine room 251: engine

Claims (10)

An engine mode selection unit including a power mode in which the engine is driven at a maximum output and a fuel consumption reduction mode in which the engine is driven at a fuel consumption reduction output;
A first sensing unit for sensing a workload applied to the work device;
A second sensing unit for sensing operation of the work device; And
Setting the predetermined load value according to a fuel consumption reduction mode signal received from the fuel consumption reduction mode, and when the working load of the working device is equal to or greater than the set load value and the working device is operated, Mode so that the engine is driven at a maximum output. 2. The apparatus according to claim 1,
When the work device is not operated regardless of the work load of the work device in the course of the operation of the work device by the automatically switched power mode, the automatically switched power mode is automatically switched to the fuel efficiency reduction mode And returning the engine to the fuel economy reducing output so that the engine is driven to the fuel economy reducing output. 3. The method according to claim 2,
A standard mode in which the engine is driven as a primary output; And
And an economy mode in which the engine is driven at a minimum output. 3. The method according to claim 2,
Wherein when the fuel consumption reduction mode is the standard mode, the maximum load value that the working device can work with the optimized performance in the standard mode,
Wherein when the fuel economy reduction mode is the economy mode, the operation device is a maximum load value capable of operating with the optimized performance in the economy mode. The apparatus of claim 1, wherein the first sensing unit comprises:
Wherein the work machine boom cylinder, the bucket cylinder, and the work machine boom cylinder, respectively. The apparatus of claim 1, wherein the second sensing unit comprises:
Wherein the boom and the bucket of the working machine are installed in the boom and the bucket, respectively. The apparatus of claim 1, wherein the second sensing unit comprises:
Wherein the work machine is provided with a work device operation lever provided in a cab. Receiving a engine mode signal from the standard mode or the economy mode selected from a power mode, a standard mode, and an economy mode, and setting a predetermined load value according to the engine mode signal;
If the control unit determines that the work load of the work device sensed by the first sensing unit is equal to or greater than the preset load value and that the operation of the work device is sensed by the second sensing unit, Automatically switching the economy mode to the power mode so as to drive the engine to a maximum output; And
Wherein the control unit automatically returns the automatically switched power mode to the first selected standard mode or the economy mode and controls the engine to be driven to a basic output or a minimum output. Method of controlling the system. The method according to claim 8,
Wherein when the standard mode is selected, the working mode device is a maximum load value capable of working with optimized performance in the standard mode. The method according to claim 8,
Wherein when the economy mode is selected, the operation mode is a maximum load value in which the work device can work with optimized performance in the economy mode.

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