KR20210103060A - Construction equipment with anti-theft function and its driving method - Google Patents

Abstract

The present invention relates to a construction machine with an anti-theft function, comprising: a starter switch (STD); a vehicle control unit (VCU) which supplies a first reference voltage to a detection terminal of the STD, detects a first detection voltage from the terminal, and compares the first reference voltage with the first detection voltage; and an engine control unit (ECU) for controlling the driving of the engine (EG). When the first reference voltage is the same as the first detection voltage, the VCU supplies a start beginning signal to the ECU. When the first reference voltage is not the same as the first detection voltage, the VCU does not supply any signal including the start beginning signal to the ECU. The ECU drives the EG in a normal mode in accordance with the start beginning signal. When no signal is supplied from the VCU to the ECU, the ECU drives the EG in a performance-limited mode. The present invention aims to provide a construction machine with an anti-theft function, which is able to protect the construction machine from theft.

Description

Construction equipment with anti-theft function and its driving method

The present invention relates to a construction machine, and more particularly, to a construction machine having an anti-theft function and a driving method thereof.

In recent years, expensive construction machinery, such as excavators, forklifts, cranes, or wheel loaders, is frequently stolen. In particular, construction machines disposed at the work site are often left unattended at the work site during work, so they are more likely to be stolen compared to the stored construction machines.

To this end, various anti-theft methods are used, and one of them is to start the engine EG when a preset authentication number is input to the key input unit of the construction machine. However, in this method, since the authentication number must be input to the key input unit whenever the engine EG is to be started, there is a risk of the authentication number being leaked to other users, and eventually, the risk of theft occurs.

In addition, the engine EG can be started even when the starter switch STD is removed from the construction machine and all terminals of the starter switch STD are electrically connected. Cannot protect construction machinery.

Prior art related thereto, for example, may be referred to from Korean Patent Publication No. 10-2008-0050687 (published on: June 10, 2008).

An object of the present invention is to provide a construction machine having an anti-theft function and a driving method thereof.

A construction machine having an anti-theft function according to the present invention for achieving the above object, a starter switch (STD); a vehicle control unit (VCU) that supplies a first reference voltage to a detection terminal of the starter switch STD, detects a first detection voltage from the terminal, and compares the first reference voltage with the first detection voltage ; and an engine control unit (ECU) that controls the driving of the engine (EG); when the first reference voltage and the first detection voltage are the same, the vehicle control unit (VCU) supplies a start-up start signal to the engine control unit (ECU); when the first reference voltage and the first sensing voltage are not the same, the vehicle control unit (VCU) does not supply any signal including the start-up start signal to the engine control unit (ECU); the engine control unit (ECU) drives the engine (EG) in a normal mode according to the start-up start signal; When no signal is supplied from the vehicle control unit (VCU) to the engine control unit (ECU), the engine control unit (ECU) drives the engine (EG) in the limited performance mode.

The starter switch STD includes a plurality of preheating terminals, and the detection terminal is an idle preheating terminal among the plurality of preheating terminals.

The starter switch STD further includes a battery fuse connection terminal, a start relay connection terminal, a start controller connection terminal, and a battery relay connection terminal; When the battery fuse connection terminal and the idle preheating terminal are connected, the first reference voltage and the first sensing voltage are different.

The engine EG driven in the performance limit mode is driven at a rotation speed smaller than a preset rotation speed limit.

When an error occurs in the vehicle control unit (VCU), the vehicle control unit (VCU) does not supply any signal including the start-up start signal to the engine control unit (ECU).

a gauge panel (GP) connected to the vehicle control unit (VCU) through a connection unit (111); The vehicle control unit (VCU) supplies a second reference voltage to the connection unit 111 , detects a second detection voltage from the connection unit 111 , and compares the second reference voltage with the second detection voltage. do.

when the second reference voltage and the second detection voltage are the same, the vehicle control unit (VCU) supplies the start-up start signal to the engine control unit (ECU); When the second reference voltage and the second detection voltage are not the same, the vehicle control unit (VCU) does not supply any signal including the start-up start signal to the engine control unit (ECU).

Before the start start signal is supplied to the engine control unit ECU, the engine control unit ECU receives a start prohibition signal from the vehicle control unit VCU.

In addition, in the method of driving a construction machine having an anti-theft function according to the present invention for achieving the above object, the key start signal from the starter switch STD is supplied to the vehicle control unit (VCU), and the engine control unit (ECU) powering the battery; supplying a start prohibition signal from a vehicle control unit (VCU) to the engine control unit (ECU); supplying a reference voltage from the vehicle control unit (VCU) to a detection terminal of the starter switch (STD); comparing, by the vehicle control unit (VCU), the reference voltage and the sensed voltage of the detection terminal; supplying, by the vehicle control unit (VCU), a start-up start signal to the engine control unit (ECU), when the reference voltage and the sensed voltage are the same as a result of the comparison; not supplying, by the vehicle control unit (VCU) any signal including the start-up start signal, to the engine control unit (ECU) when the reference voltage and the sensed voltage are not the same as the comparison result; driving, by the engine control unit (ECU), the engine (EG) in a normal mode according to the start-up start signal; and when no signal is supplied from the vehicle control unit (VCU) to the engine control unit (ECU), the engine control unit (ECU) driving the engine (EG) in a limited performance mode.

The starter switch STD includes a plurality of preheating terminals, and the detection terminal is an idle preheating terminal among the plurality of preheating terminals.

The starter switch STD further includes a battery fuse connection terminal, a start relay connection terminal, a start controller connection terminal, and a battery relay connection terminal; When the battery fuse connection terminal and the idle preheating terminal are connected, the reference voltage and the sensing voltage are different.

The engine EG driven in the performance limit mode is driven at a rotation speed smaller than a preset rotation speed limit.

In addition, the construction machine having an anti-theft function according to the present invention for achieving the above object is a starter switch (STD); a vehicle control unit (VCU) that supplies a first reference voltage to a detection terminal of the starter switch STD, detects a first detection voltage from the terminal, and compares the first reference voltage with the first detection voltage ; and an engine control unit (ECU) that controls the driving of the engine (EG); when the first reference voltage and the first detection voltage are the same, the vehicle control unit (VCU) supplies a start-up start signal to the engine control unit (ECU); when the first reference voltage and the first sensing voltage are not the same, the vehicle control unit (VCU) does not supply any signal including the start-up start signal to the engine control unit (ECU); the engine control unit (ECU) drives the engine (EG) in a normal mode according to the start-up start signal; When no signal is supplied from the vehicle control unit (VCU) to the engine control unit (ECU), the engine control unit (ECU) does not drive the engine. The first reference voltage and the first sensing voltage Under this same condition, when an error occurs in the vehicle control unit VCU, the vehicle control unit VCU drives the engine EG in the performance limit mode.

a gauge panel (GP) connected to the vehicle control unit (VCU) through a connection unit (111); The vehicle control unit (VCU) supplies a second reference voltage to the connection unit 111 , detects a second detection voltage from the connection unit 111 , and compares the second reference voltage with the second detection voltage. do.

When the second reference voltage and the second sensed voltage are not the same, the vehicle control unit VCU drives the engine EG in the limited performance mode.

When the first reference voltage and the first detection voltage are the same and an error does not occur in the vehicle control unit (VCU), when the second reference voltage and the second detection voltage are the same, the vehicle control The unit VCU supplies the start start signal to the engine control unit ECU.

According to the present invention, when the construction machine is started by an abnormal method other than by inserting a key, the construction machine is driven in the performance limit mode. Accordingly, the construction machine of the present invention can be safely protected from theft.

1 is a view showing a block diagram of a construction machine according to an embodiment of the present invention.
FIG. 2 is a view for explaining the operation of the starter switch of FIG. 1 .
3 is a view for explaining a method of driving a construction machine according to an embodiment of the present invention.
4 is a view for explaining a method of driving a construction machine according to another embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques have not been specifically described in order to avoid obscuring the present invention. Like reference numerals refer to like elements throughout.

In the present specification, when it is said that a part is connected to another part, it includes not only a case in which it is directly connected, but also a case in which it is electrically connected with another element interposed therebetween. In addition, when it is said that a part includes a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

In this specification, terms such as first, second, third, etc. may be used to describe various components, but these components are not limited by the terms. The above terms are used for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, the first component may be referred to as a second or third component, and similarly, the second or third component may also be alternately named.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, a construction machine having an anti-theft function according to the present invention will be described in detail with reference to FIGS. 1 to 4 .

1 is a view showing a block configuration diagram of a construction machine according to an embodiment of the present invention, FIG. 2 is a view for explaining the operation of the starter switch (STD) of FIG.

A construction machine according to an embodiment of the present invention, as shown in FIG. 1 , a gauge panel (GP), a vehicle control unit (VCU), an engine control unit (ECU), an engine (EG), and a starter switch (STD) includes

The embodiment of the present invention describes a structure applied to a construction machine as an example, but is not limited thereto, and may be variously applied to a vehicle equipped with an engine, heavy equipment, agricultural machinery, and the like.

A construction machine such as an excavator is disposed on the undercarriage through, for example, an undercarriage having a traveling device driven by a traveling hydraulic motor, a swinging device driven by the swinging hydraulic motor, and the swinging device It includes an upper revolving body, a working machine mounted at a central position in the front of the upper revolving body, and a cab is provided in the upper revolving body. The working machine includes a boom movably connected up and down to the upper swing body, an arm rotatably connected to the boom, and a bucket rotatably connected to the arm, and is a hydraulic cylinder for operating them, a boom cylinder, an arm cylinder, a bucket Includes cylinder.

A driver's seat is provided in the cab, and a driving lever, a driving pedal, and an attachment pedal for controlling the undercarriage are mounted in front of the driver's seat. In addition, an operation lever for operating the operation of the boom, arm, and bucket is provided on both sides of the driver's seat, and a starter switch (STD), a horn button, a safety lever, a gauge panel (GP), etc. are provided on one side of the operation lever. is installed

The starter switch STD includes a plurality of switching terminals capable of performing vehicle start on/off, engine start, pre-heating, etc., and a rotary that changes a connection state with a plurality of switching terminals according to the rotation of the ignition key. It can have an expression structure.

The starter switch STD may be mechanically provided as a mechanical rotation type, and in this case, an electrical contact portion may be rotated while the ignition key is rotated to be connected to a desired switching terminal. In addition, it is provided in a button-type one-touch structure like a smart ignition key, so that it can be connected to a desired switching terminal by sequentially rotating the electrical contact part whenever it is touched.

For example, when the construction machine is an excavator, the starter switch STD includes a battery fuse connection terminal B, a battery relay connection terminal BR, a start controller connection terminal ACC, and a first preheating terminal, as shown in FIG. 2 . (R1), a second preheating terminal (R2), may include a start relay connection terminal (C). The battery fuse connection terminal B is connected to the battery fuse box, and the battery relay connection terminal BR is a switching terminal that operates on and off to supply power from the battery. The start controller connection terminal (ACC) is an in-vehicle electrical supply switch. The start relay connection terminal (C) is connected to the start relay for starting the engine (EG). The form provided in this way is also called a key box.

The battery fuse connection terminal (B), the battery relay connection terminal (BR), and the start controller connection terminal (ACC) are related to vehicle starting, and the first preheating terminal (R1) and the start relay connection terminal (C) are connected to the engine (EG). related to start-up During the vehicle starting operation, it is connected to the battery to receive power, and during the engine (EG) starting operation, it is connected to the engine (EG) to operate the engine revolution per minute (RPM) required for the operation.

As such, the starter switch STD having a plurality of switching terminals is a start-on signal (refer to “ON” in the table of FIG. 2 ) or an engine start operation signal ( FIG. 2 ) according to operation of a key (ie, a key for starting). "START" listed in the table of ), etc., when outputting the start-on signal, the starter switch (STD) is connected to the battery fuse connection terminal (B), the battery relay connection terminal (BR), and the start controller. The connection terminals ACC are electrically connected to each other.

When outputting the engine (EG) start operation signal (START; that is, the key start signal), the starter switch STD is connected to the battery fuse connection terminal (B), the battery relay connection terminal (BR), and the start controller connection terminal (ACC). ), the first preheating terminal (R1), and the start relay connection terminal (C) are connected to each other.

The engine control unit (ECU) controls the operation of the engine (EG) to perform driving and work of the construction machine. That is, the operation of the engine EG is started or ended by turning on or off the engine start of the starter switch STD, and the engine EG rotation speed RPM required for driving and working of the construction machine is controlled.

The key is normally inserted into the starter switch (STD), and by the rotation of the key, the battery fuse connection terminal (B), the battery relay connection terminal (BR), the start controller connection terminal (ACC), the first preheating terminal (R1) and When the start relay connection terminals C are connected to each other, power from the battery may be supplied to the engine control unit ECU to start the engine EG. For example, the fuse connection terminal (B) of the starter switch (STD), the battery relay connection terminal (BR), the start controller connection terminal (ACC), the first preheating terminal (R1), and the start relay connection terminal (C) are connected to each other When connected, a key start signal from the starter switch STD is output, and power from the battery is transmitted to the engine control unit ECU by this key start signal. At this time, the key start signal is also supplied to the vehicle control unit VCU, and the vehicle control unit VCU that has received the key start signal supplies the start prohibition signal to the engine control unit ECU. While engine control unit ECU is receiving this start prohibition signal, engine control unit ECU does not start engine EG even if power is supplied to engine control unit ECU. That is, the vehicle control unit (VCU) first determines whether the current construction machine is in a startable state, and transmits a start start signal to the engine control unit (ECU) instead of the start prohibition signal only when the construction machine is startable as a result of the determination. In other words, the engine control unit ECU does not start the engine EG until it receives the start start signal. Here, the startable state of the construction machine is, for example, a case in which the gear of the construction machine is disposed at a position in the parking mode. If the gear of the construction machine is positioned in the driving mode, the vehicle control unit VCU transmits a start prohibition signal to the engine control unit ECU so that the engine EG is not started. Until the construction machine is maintained in a startable state, the vehicle control unit (VCU) continuously transmits a start prohibition signal to the engine control unit (ECU).

Meanwhile, even when the construction machine is in a startable state, the vehicle control unit VCU determines whether the key start signal is normally generated to determine whether the engine EG is finally started. To this end, the vehicle control unit VCU supplies a first reference voltage to the detection terminal of the starter switch STD, detects a first detection voltage from the detection terminal, and divides the first reference voltage and the first detection voltage. Compare. Here, the detection terminal of the starter switch STD may be any one of the preheating terminals R1 and R2. For example, the detection terminal may be the second preheating terminal R2 in an idle state among the first and second preheating terminals R1 and R2. The second preheating terminal R2 may be a dummy terminal not involved in starting. That is, when the key for starting is rotated, the battery fuse connection terminal (B), the battery relay connection terminal (BR), the start controller connection terminal (ACC), the first preheating terminal (R1) and the start relay connection terminal (C) are connected to each other. While connected, this second preheating terminal R2 is not connected to any terminal of the starter switch STD. However, the present invention is not limited thereto, and in addition to the second preheating terminal in the idle state of the above example, if the starter switch further includes another spare terminal in the idle state, the spare terminal may be used as the detection terminal.

The vehicle control unit VCU and the detection terminal (eg, the second preheating terminal R2 ) of the starter switch STD are electrically connected. The vehicle control unit VCU supplies a first reference voltage, which is a DC voltage having a constant magnitude, to the dummy terminal. Here, the first reference voltage may be different from the voltage of the battery fuse connection terminal (B). For example, the first reference voltage may be 5 [V], and the voltage of the battery fuse connection terminal B may be 12 [V].

In addition, the vehicle control unit VCU detects the voltage of the detection terminal (ie, the first detection voltage), and compares the detected first detection voltage with the first reference voltage. In other words, the vehicle control unit VCU determines whether the first sensing voltage is equal to the first reference voltage. As a result of the determination, when the first sensed voltage is equal to the first reference voltage, the vehicle control unit VCU supplies a start start signal to the engine control unit ECU. The engine control unit ECU drives the engine EG in the normal mode according to the start-up start signal. The engine EG in the normal mode may be driven at a rotational speed proportional to the pressure applied to the accelerator pedal.

On the other hand, when the key start signal is generated in an abnormal way, the first detection voltage of the detection terminal may be different from the first reference voltage. For example, when the starter switch STD is separated from the construction machine and all terminals of the starter switch STD are connected to each other, the first sensing voltage may not be the same as the first reference voltage. That is, since the terminals of the starter switch STD cannot visually distinguish their roles, all terminals of the starter switch STD must be connected to each other in order to start the construction machine in an abnormal way. In this case, since the detection terminal of the starter switch STD is connected to the battery fuse connection terminal B, the first detection voltage and the first reference voltage detected from the detection terminal may have different values. For example, the voltage of the battery fuse connection terminal B may be 12 [V], and the first reference voltage may be 5 [V], and the voltage of the battery fuse connection terminal B is applied to the detection terminal. Then, the first detection voltage of the detection terminal may have a value different from 5 [V]. As such, when the first sensing voltage and the first reference voltage are not the same, the vehicle control unit VCU that has sensed the difference does not supply any signal to the engine control unit ECU. In other words, when the first detection voltage and the first reference voltage are not the same, the vehicle control unit VCU does not supply any signals including the start start signal and the start prohibition signal to the engine control unit ECU. In this way, when communication (eg, controller area network (CAN) communication) between the vehicle control unit (VCU) and the engine control unit (ECU) is cut off for a predetermined time or more, the engine control unit (ECU) is in the performance limit mode (For example, limp mode or limp home mode) to drive the engine (EG). The engine EG in the limited performance mode may be driven at a rotation speed smaller than a preset rotation speed limit. For example, regardless of the pressure applied to the accelerator pedal, the engine EG in the limited performance mode may be driven at less than about 3000 RPM.

Also, when the first sensing voltage and the first reference voltage are not the same, the vehicle control unit VCU may not supply any signal to the shift control unit. In this case, the shift control unit may be driven in the performance limit mode. The shift control unit in the performance limit mode may not shift the gear to a higher than 3rd gear, and accordingly, the speed of the construction machine is also limited to a considerably lower speed. Therefore, the construction machine in the performance limit mode remains unsuitable for driving on a highway. Accordingly, when the construction machine is started by an abnormal method other than the insertion of the key, the construction machine is driven in the performance limit mode, so the construction machine of the present invention can be safely protected from theft. In addition, even when the engine is started by an abnormal method, the limited operation of the construction machine is possible through the performance limit mode, so that the construction machine can be safely moved from a dangerous place.

On the other hand, when an error or failure occurs in the vehicle control unit VCU, the vehicle control unit VCU does not supply any signals including the start start signal and the start prohibit signal to the engine control unit ECU. For example, when the vehicle control unit (VCU) is removed from the construction machine for the purpose of theft, communication between the vehicle control unit (VCU) and the engine control unit (ECU) is cut off so that the engine control unit (ECU) performs the above-described performance Run the engine EG in limited mode.

The gauge panel GP may be a display device that displays the speed and the number of rotations of the construction machine. In addition, this gauge panel (GP) may display an input menu for entering a password for starting the construction machine. The gauge panel GP may be electrically connected to the vehicle control unit VCU through the connection part 111 . The vehicle control unit VCU supplies the second reference voltage to the connection unit 111 . The second reference voltage may be supplied to a specific terminal (eg, a ground terminal) of the gauge panel GP through the connection part 111 .

The vehicle control unit VCU detects the second sensed voltage from the connection 111 , and compares the second reference voltage with the second sensed voltage. As a result of this comparison, when the second reference voltage and the second detection voltage are the same, the vehicle control unit VCU supplies a start start signal to the engine control unit ECU. Accordingly, the engine control unit ECU drives the engine EG in the normal mode. On the other hand, when the second reference voltage is different from the second sensed voltage as a result of the comparison, communication (eg, CAN communication) between the vehicle control unit (VCU) and the engine control unit (ECU) is cut off. For example, when the gauge panel GP is removed from the construction machine for the purpose of theft, the second reference voltage and the second detection voltage are different. No signal, including the start prohibition signal, is transmitted to the engine control unit (ECU). In this case, communication between the vehicle control unit (VCU) and the engine control unit (ECU) is cut off so that the engine control unit (ECU) drives the engine (EG) in the performance limiting mode as described above.

A situation in which the first reference voltage and the first detection voltage are different (hereinafter, the first situation), a situation in which an error occurs in the vehicle control unit (VCU) (hereinafter, the second situation), and the second reference voltage and the second detection voltage When at least one of these other situations (hereinafter referred to as a third situation) occurs, the engine EG may be driven in the performance limit mode. On the other hand, when all of the first to third situations described above do not occur, the engine EG may be driven in the normal mode.

3 is a view for explaining a method of driving a construction machine according to an embodiment of the present invention.

First, when a key is normally inserted into the starter switch STD (S1) or all terminals of the starter switch STD are electrically connected in an abnormal way, a key start signal is generated from the starter switch STD (S2).

Power from the battery is supplied to the engine control unit (ECU) by a key start signal from the starter switch (STD). In addition, the vehicle control unit VCU transmits a start prohibition signal to the engine control unit ECU in response to the key start signal from the starter switch STD (S3).

Thereafter, the vehicle control unit VCU determines whether the first reference voltage and the first sensing voltage are the same (S4). When the key startup signal is generated by normal key insertion, the first reference voltage and the first detection voltage are the same, and when the key startup signal is generated by an abnormal method, the first detection voltage may have a different value from the first reference voltage.

If the first reference voltage and the first detection voltage are the same, the vehicle control unit VCU determines whether an error has occurred in the vehicle control unit VCU (S5). For example, if the vehicle control unit (VCU) has not been removed, an error is not generated in the vehicle control unit (VCU). On the other hand, when the vehicle control unit VCU is removed, an error occurs in the vehicle control unit VCU.

If there is no error in the vehicle control unit VCU, the vehicle control unit VCU determines whether the second reference voltage and the second detection voltage are the same (S6). If the gauge panel GP is not removed, the second reference voltage and the second sensing voltage are the same. On the other hand, when the gauge panel GP is removed, the second reference voltage and the second sensing voltage are not the same.

When the first reference voltage and the first detection voltage are equal, there is no error in the vehicle control unit VCU, and the second reference voltage and the second detection voltage are equal, the vehicle control unit VCU sends a start start signal to the engine It transmits to the control unit (ECU) (S7). Accordingly, the engine control unit ECU drives the engine EG in the normal mode (S8). On the other hand, when at least one of the above-described first to third situations occurs, communication between the vehicle control unit (VCU) and the engine control unit (ECU) is cut off (S9), so that the engine control unit (ECU) performs The engine EG is driven in the limited mode (S10).

4 is a view for explaining a method of driving a construction machine according to another embodiment of the present invention.

First, when the key is normally inserted into the starter switch STD (S11) or all terminals of the starter switch STD are electrically connected in an abnormal way, a key start signal is generated from the starter switch STD (S22).

Power from the battery is supplied to the engine control unit (ECU) by a key start signal from the starter switch (STD). Further, the vehicle control unit VCU transmits a start prohibition signal to the engine control unit ECU in response to the key start signal from the starter switch STD (S33).

Thereafter, the vehicle control unit VCU determines whether the first reference voltage and the first sensing voltage are the same ( S44 ). When the key startup signal is generated by normal key insertion, the first reference voltage and the first detection voltage are the same, and when the key startup signal is generated by an abnormal method, the first detection voltage may have a different value from the first reference voltage.

When the first detection voltage and the first reference voltage are not the same, the vehicle control unit (VCU) does not supply any signal including a start-up start signal to the engine control unit (ECU). As such, when no signal is supplied from the vehicle control unit VCU to the engine control unit ECU, the engine control unit ECU does not drive the engine EG. In other words, when the first sensing voltage and the first reference voltage are not the same, the engine control unit ECU does not start the engine EG.

On the other hand, if the first reference voltage and the first sensing voltage are the same, the vehicle control unit VCU determines whether an error has occurred in the vehicle control unit VCU (S55). For example, if the vehicle control unit (VCU) has not been removed, an error is not generated in the vehicle control unit (VCU). On the other hand, when the vehicle control unit VCU is removed, an error occurs in the vehicle control unit VCU.

When an error occurs in the vehicle control unit VCU under the condition in which the first sensing voltage and the first reference voltage are the same, the engine control unit ECU drives the engine EG in the performance limit mode ( S100 ).

Meanwhile, if there is no error in the vehicle control unit VCU, the vehicle control unit VCU determines whether the second reference voltage and the second detection voltage are the same (S66). If the gauge panel GP is not removed, the second reference voltage and the second sensing voltage are the same. On the other hand, when the gauge panel GP is removed, the second reference voltage and the second sensing voltage are not the same.

Under the condition that the first detection voltage and the first reference voltage are the same and there is no error in the vehicle control unit, when the second reference voltage and the second detection voltage are different, the engine control unit ECU limits the performance of the engine EG. mode (S100).

On the other hand, when the first reference voltage and the first detection voltage are the same, there is no error in the vehicle control unit VCU, and the second reference voltage and the second detection voltage are the same, the vehicle control unit VCU sends a start-up start signal is transmitted to the engine control unit (ECU) (S77). Accordingly, the engine control unit ECU drives the engine EG in the normal mode (S88).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

GP: Gauge panel VCU: Vehicle control unit
ECU: Engine Control Unit EG: Engine
STD: Starter switch B: Fuse connection terminal
C: start relay connection terminal R1: first preheat terminal
ACC: start controller connection terminal R2: second preheat terminal
BR: battery relay connection terminal 111: connection

Claims (17)

starter switch;
a vehicle control unit that supplies a first reference voltage to a detection terminal of the starter switch, detects a first detection voltage from the terminal, and compares the first reference voltage with the first detection voltage; and
an engine control unit for controlling driving of the engine;
when the first reference voltage and the first sensed voltage are the same, the vehicle control unit supplies a start-up start signal to the engine control unit;
when the first reference voltage and the first sensing voltage are not the same, the vehicle control unit does not supply any signal including the start-up start signal to the engine control unit;
the engine control unit drives the engine in a normal mode according to the start-up start signal;
A construction machine having an anti-theft function, wherein when no signal is supplied from the vehicle control unit to the engine control unit, the engine control unit drives the engine in a limited performance mode. The method of claim 1,
The starter switch includes a plurality of preheating terminals, and the detection terminal is an idle preheating terminal among the plurality of preheating terminals. 3. The method of claim 2,
the starter switch further includes a battery fuse connection terminal, a start relay connection terminal, a start controller connection terminal, and a battery relay connection terminal;
A construction machine having an anti-theft function in which the first reference voltage and the first sensing voltage are different when the battery fuse connection terminal and the idle preheating terminal are connected. The method of claim 1,
The engine driven in the performance limit mode is a construction machine having an anti-theft function that is driven at a rotation speed smaller than a preset rotation speed limit. The method of claim 1,
When an error occurs in the vehicle control unit, the vehicle control unit has an anti-theft function that does not supply any signals including the start start signal to the engine control unit. The method of claim 1,
a gauge panel connected to the vehicle control unit via a connection;
The vehicle control unit supplies a second reference voltage to the connection part, detects a second detection voltage from the connection part, and compares the second reference voltage with the second detection voltage. 7. The method of claim 6,
when the second reference voltage and the second detection voltage are the same, the vehicle control unit supplies the starting start signal to the engine control unit;
When the second reference voltage and the second detection voltage are not the same, the vehicle control unit has an anti-theft function that does not supply any signal including the start start signal to the engine control unit. The method of claim 1,
A construction machine having an anti-theft function in which the engine control unit receives a start prohibition signal from the vehicle control unit before the start start signal is supplied to the engine control unit. supplying the key start signal from the starter switch to the vehicle control unit and supplying power of the battery to the engine control unit;
supplying a start prohibition signal from a vehicle control unit to the engine control unit;
supplying a reference voltage from the vehicle control unit to a detection terminal of the starter switch;
comparing, by the vehicle control unit, the reference voltage and the detection voltage of the detection terminal;
supplying, by the vehicle control unit, a start start signal to the engine control unit, when the reference voltage and the sensed voltage are the same as the comparison result;
not supplying, by the vehicle control unit, any signal including the start-up start signal to the engine control unit when the reference voltage and the sensed voltage are not the same as the comparison result;
driving, by the engine control unit, the engine in a normal mode according to the start-up start signal; and
and when no signal is supplied from the vehicle control unit to the engine control unit, the engine control unit driving the engine in a limited performance mode. 10. The method of claim 9,
The starter switch includes a plurality of preheating terminals, and the detection terminal is an idle preheating terminal among the plurality of preheating terminals. 11. The method of claim 10,
the starter switch further includes a battery fuse connection terminal, a start relay connection terminal, a start controller connection terminal, and a battery relay connection terminal;
When the battery fuse connection terminal and the preheating terminal in the idle state are connected, the first reference voltage and the first detection voltage are different from each other. 10. The method of claim 9,
The driving method of a construction machine having an anti-theft function in which the engine driven in the performance limit mode is driven at a rotation speed smaller than a preset rotation speed limit. starter switch;
a vehicle control unit that supplies a first reference voltage to a detection terminal of the starter switch, detects a first detection voltage from the terminal, and compares the first reference voltage with the first detection voltage; and
an engine control unit for controlling driving of the engine;
when the first reference voltage and the first detection voltage are the same, the vehicle control unit supplies a start-up start signal to the engine control unit;
when the first reference voltage and the first detection voltage are not the same, the vehicle control unit does not supply any signal including the start-up start signal to the engine control unit;
the engine control unit drives the engine EG in a normal mode according to the start-up start signal;
a construction machine having an anti-theft function in which the engine control unit does not drive the engine when no signal is supplied from the vehicle control unit to the engine control unit. 14. The method of claim 13,
Under the condition that the first reference voltage and the first detection voltage are the same, when an error occurs in the vehicle control unit, the vehicle control unit has an anti-theft function that drives the engine in a limited performance mode. 15. The method of claim 14,
a gauge panel connected to the vehicle control unit via a connection;
The vehicle control unit supplies a second reference voltage to the connection part, detects a second detection voltage from the connection part, and compares the second reference voltage with the second detection voltage. 16. The method of claim 15,
When the second reference voltage and the second detection voltage are not the same, the vehicle control unit has an anti-theft function for driving the engine in a limited performance mode. 16. The method of claim 15,
When the first reference voltage and the first detection voltage are the same and an error does not occur in the vehicle control unit, when the second reference voltage and the second detection voltage are the same, the vehicle control unit is configured to A construction machine having an anti-theft function that supplies a start start signal to the engine control unit.

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