阅读说明：本技术 工程机械 (Construction machine ) 是由 姜敏虎 张政权 于 2021-03-17 设计创作，主要内容包括：本发明涉及一种工程机械,包括：发动机,其产生动力；点火开关,其用于接通和关断电气部件的电源；发动机控制单元,其在所述点火开关由接通所述电气部件的电源的打开(ON)状态转换至关断所述电气部件的电源的关闭(OFF)状态时将所述发动机的驱动维持预先决定的时间后停止；以及车辆控制单元,其在处于预先决定的状况时发送强制停止所述发动机的信号,从而可以防止发动机控制单元引起的不便和事故。(The invention relates to an engineering machine, comprising: an engine that generates power; an ignition switch for turning on and off a power supply of the electrical component; an engine control unit that stops after maintaining driving of the engine for a predetermined time when the ignition switch is switched from an ON (ON) state in which the power supply of the electrical component is turned ON to an OFF (OFF) state in which the power supply of the electrical component is turned OFF; and a vehicle control unit which transmits a signal for forcibly stopping the engine when it is in a predetermined condition, so that inconvenience and accidents caused by the engine control unit can be prevented.)

1. A work machine, comprising:

an engine (100) that generates power;

an ignition switch (410) for turning on and off the power supply of the electrical component;

an engine control unit (450) that stops after maintaining the driving of the engine (100) for a predetermined time when the ignition switch (410) is switched from an ON (ON) state in which the power supply of the electrical component is turned ON to an OFF (OFF) state in which the power supply of the electrical component is turned OFF; and

and a vehicle control unit (460) that sends a signal for forcibly stopping the engine (100) when the vehicle is in a predetermined state.

2. The work machine of claim 1,

the vehicle control unit (460) is formed to be activated when receiving a signal from a driver.

3. The work machine of claim 2, further comprising:

an instrument panel (440) that provides information to a driver,

the instrument panel (440) includes a forced engine stop button that receives the signal from the driver.

4. A working machine according to claim 3,

the forced engine stop button is formed to light up when the engine control unit (450) is started.

5. A working machine according to claim 3,

the vehicle control unit (460) includes a relay control circuit (462), the relay control circuit (462) having a relay to control current flow when receiving the signal from the instrument panel (440).

6. A working machine according to claim 5,

the engine control unit (450) includes:

a transmission terminal (452) for transmitting an emergency stop current;

a receiving terminal (454) for receiving the emergency stop current;

an emergency stop circuit (456) for electrically connecting the transmission terminal (452) and the reception terminal (454); and

a relay (458) that is activated by the relay control current to open and close the emergency stop circuit (456),

when the signal is transmitted from the instrument panel (440) to the vehicle control unit (460), the relay control current flows through the relay control circuit (462), the relay (458) is driven, the emergency stop circuit (456) is opened, and the emergency stop current transmitted from the transmission terminal (452) is received by the reception terminal (454) so that the vehicle control unit (460) is activated.

7. A working machine according to claim 2,

the ignition switch (410) is switched from an off state to an on state for a predetermined time and then switched to an off state, thereby inputting the signal through the ignition switch (410).

8. A working machine according to claim 7,

the vehicle control unit (460) includes a relay control circuit (462), the relay control circuit (462) having a relay control current flowing when receiving the signal through the ignition switch (410).

9. A working machine according to claim 8,

the engine control unit (450) includes:

a transmission terminal (452) for transmitting an emergency stop current;

a receiving terminal (454) for receiving the emergency stop current;

an emergency stop circuit (456) for electrically connecting the transmission terminal (452) and the reception terminal (454); and

a relay (458) that is activated by the relay control current to open and close the emergency stop circuit (456),

when the signal is transmitted from the ignition switch (410) to the vehicle control unit (460), the relay control current flows through the relay control circuit (462), the relay (458) is activated, and the emergency stop circuit (456) is opened, the emergency stop current transmitted from the transmission terminal (452) is received by the reception terminal (454), so that the vehicle control unit (460) is activated.

10. The work machine of claim 1, further comprising:

an instrument panel (440) that provides information to a driver, and

is formed to activate the vehicle control unit (460) when an electrical connection between the vehicle control unit (460) and at least one of the engine control unit (450), the dashboard (440), and the ignition switch (410) is broken.

Technical Field

The present invention relates to a construction machine, and more particularly, to a construction machine capable of performing civil engineering or construction work.

Background

In general, a working machine is, for example, a machine for civil engineering or construction work like an excavator, a loader, and includes: an engine that generates power; a drive portion that is started by receiving power generated by the engine; and an engine control unit for preventing damage to an aftertreatment device by delaying an engine stop in a state where the aftertreatment device post-treating gas exhausted from the engine is at a high temperature.

Fig. 1 is a system diagram showing a conventional construction machine, and is a system diagram showing a case where an ignition switch is in an on state, fig. 2 is a system diagram showing a state where the ignition switch is in an off state and an engine control unit is activated in the construction machine of fig. 1, and fig. 3 is a sequence diagram showing a process of activating the engine control unit in a control unit of fig. 2.

Referring to fig. 1 to 3, a conventional construction machine includes: an ignition switch 41 for turning on and off the ignition switch 41 of the power supply of the electric components; and an engine control unit that stops after maintaining the driving of the engine 10 for a predetermined time when the ignition switch 41 is switched from an ON (ON) state in which the power supply of the electrical components is turned ON to an OFF (OFF) state in which the power supply of the electrical components is turned OFF.

However, the conventional construction machine has a problem that the engine control unit causes inconvenience and an accident. Specifically, when the engine control unit is operated, it is always necessary to elapse a predetermined time to stop the engine 10, without stopping the engine 10 in between. That is, when the engine 10 needs to be stopped immediately although the engine control unit is in operation (for example, when a driver needs to be made an emergency from the construction machine, a fire occurs, an abnormality occurs in starting the construction machine, or the like), the engine 10 continues to be started, and there is a problem that inconvenience is incurred to the driver or an accident is caused.

Disclosure of Invention

Technical problem

Accordingly, an object of the present invention is to provide a construction machine capable of preventing inconvenience and accidents caused by an engine control unit.

Technical scheme

In order to achieve the above object, the present invention provides a construction machine including: an engine that generates power; an ignition switch for turning on and off a power supply of the electrical component; an engine control unit 450 that stops after maintaining the driving of the engine for a predetermined time when the ignition switch is switched from an ON (ON) state in which the power supply of the electrical component is turned ON to an OFF (OFF) state in which the power supply of the electrical component is turned OFF; and a vehicle control unit that transmits a signal for forcibly stopping the engine when the vehicle is in a predetermined condition.

The vehicle control unit may be formed to be activated when receiving a signal from a driver.

The working machine may further include: an instrument panel that provides information to the driver, the instrument panel may include a forced engine stop button that receives the signal from the driver.

The forced engine stop button may be formed to be lighted when the engine control unit 450 is started.

The vehicle control unit may include a relay control circuit having a relay controlling current to flow when receiving the signal from the instrument panel.

The engine control unit may be formed to include: a transmission terminal for transmitting an emergency stop current; a receiving terminal for receiving the emergency stop current; an emergency stop circuit electrically connecting the transmission terminal and the reception terminal; and a relay that is activated by the relay control current to open and close the emergency stop circuit, when the signal is transmitted from the instrument panel to the vehicle control unit, the relay control current flows through the relay control circuit, the relay is activated, and the emergency stop circuit is opened, the emergency stop current transmitted from the transmission terminal is received by the reception terminal, so that the vehicle control unit is activated.

The ignition switch is switched from the off state to the on state for a predetermined time and then switched to the off state, whereby the signal can be input through the ignition switch.

The vehicle control unit may include a relay control circuit that has a relay control current flowing therethrough when receiving the signal through the ignition switch.

The engine control unit may include: a transmission terminal for transmitting an emergency stop current; a receiving terminal for receiving the emergency stop current; an emergency stop circuit electrically connecting the transmission terminal and the reception terminal; and a relay that is activated by the relay control current to open and close the emergency stop circuit, and is formed such that when the signal is transmitted from the ignition switch to the vehicle control unit, the relay control current flows through the relay control circuit, the relay is activated, and the emergency stop circuit is opened, the emergency stop current transmitted from the transmission terminal is received by the reception terminal, so that the vehicle control unit is activated.

The working machine may further include: an instrument panel that provides information to a driver and is formed to activate the vehicle control unit when an electrical connection between the vehicle control unit and at least one of the engine control unit, the instrument panel, and the ignition switch is disconnected.

ADVANTAGEOUS EFFECTS OF INVENTION

The construction machine of the present invention includes: an engine that generates power; an ignition switch for turning on and off a power supply of the electrical component; an engine control unit that stops after maintaining driving of the engine for a predetermined time when the ignition switch is switched from an ON (ON) state in which the power supply of the electrical component is turned ON to an OFF (OFF) state in which the power supply of the electrical component is turned OFF; and a vehicle control unit which transmits a signal for forcibly stopping the engine when it is in a predetermined condition, so that inconvenience and accidents caused by the engine control unit can be prevented.

Drawings

Fig. 1 is a system diagram showing a conventional construction machine, and shows a case where an ignition switch is turned on.

Fig. 2 is a system diagram illustrating a state in which an ignition switch is in an off state and an engine control unit is activated in the construction machine of fig. 1.

Fig. 3 is a sequence diagram showing a starting process of the engine control unit in the control portion of fig. 2.

Fig. 4 is a system diagram showing a construction machine according to an embodiment of the present invention, and is a system diagram showing a case where an ignition switch is in an on state.

Fig. 5 is a system diagram showing a state in which an ignition switch is in an off state and an engine control unit is activated in the construction machine of fig. 4.

Fig. 6 is a system diagram showing a state in which a vehicle control unit in the construction machine of fig. 5 is activated.

Fig. 7 is a sequence diagram showing a starting process of the engine control unit and the vehicle control unit in the control portions of fig. 5 and 6.

Reference numerals

100: engine, 200: hydraulic device, 210: pump, 220: hydraulic circuit, 410: ignition switch, 412: input terminal, 414: output terminal, 416: ignition switch bridge, 440: instrument panel, 450: engine control unit, 452: transmission terminal, 454: reception terminal, 456: emergency stop circuit, 458: a relay, 460: vehicle control unit, 462: relay control circuit, 472: electromagnetic coil, 474: pilot cut valve, 476: pilot cut-off switch, 476 a: first port, 476 b: second port, 476 c: pilot cut switch bridge, 478: elastic member, 500: alternator, 600: a battery, 710: charging wire, 720: discharge line, 730: a pilot cutting line.

Detailed Description

The construction machine according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 4 is a system diagram showing a construction machine according to an embodiment of the present invention, and is a system diagram showing a case where an ignition switch is in an on state, fig. 5 is a system diagram showing a state where the ignition switch is in an off state and an engine control unit is activated in the construction machine of fig. 4, fig. 6 is a system diagram showing a state where a vehicle control unit is activated in the construction machine of fig. 5, and fig. 7 is a sequence diagram showing a process of activating the engine control unit and the vehicle control unit in the construction machine of fig. 5 and 6.

Referring to fig. 4 to 6, a working machine according to an embodiment of the present invention may include: a boarding unit that provides a space in which a driver can board; and a driving unit operated by the driver to perform excavation work for excavating the ground, loading work for carrying earth and sand, crushing work for dismantling a building, soil preparation work for settling the ground, and the like.

The riding section is formed in an upper rotating body to be described later, and may include a riding seat on which the driver can sit, and a pedal and a lever arranged around the riding seat.

Further, an ignition switch 410 and an instrument panel 440 to be described later may be formed in the boarding portion.

The driving part may include: an engine 100 that generates power; a hydraulic device 200 that receives power generated by the engine 100 to generate and transmit hydraulic pressure; and a working unit (not shown) for performing a work by using the hydraulic pressure transmitted from the hydraulic device 200.

The engine 100 may be formed as a diesel engine that compresses and combusts fuel, such as white oil, and converts it into mechanical energy.

In addition, the engine 100 may include an after-treatment device (not shown) that removes harmful substances in exhaust gas generated by combustion of fuel.

The hydraulic device 200 may include a pump 210 that generates hydraulic pressure, and a hydraulic circuit 220 that transmits the hydraulic pressure from the pump 210 to the working unit (not shown).

The working unit (not shown) may include: a lower traveling body movable along the ground; an upper rotating body rotatably provided on an upper portion of the lower traveling body; a boom rotatably coupled to the upper rotating body; a boom cylinder that rotates the boom; an arm rotatably coupled to a distal end portion of the boom; an arm cylinder that rotates the arm; a bucket rotatably coupled to a front end portion of the arm; and a bucket cylinder that rotates the bucket.

On the other hand, the working machine of the present embodiment may include: an ignition switch 410 for turning on and off the power supply of the electrical components; an engine control unit 450 that stops after maintaining the driving of the engine 100 for a predetermined time when the ignition switch 410 is switched from an ON (ON) state in which the power supply of the electrical components is turned ON to an OFF (OFF) state in which the power supply of the electrical components is turned OFF; and a vehicle control unit 460 that sends a signal for forcibly stopping engine 100 when the vehicle is in a predetermined condition.

Here, the predetermined condition is a condition in which the driver desires to stop the engine 100, for example, a situation in which a fire occurs and thus the driver needs to get out of the boarding seat urgently, and may be formed such that the vehicle control unit 460 is activated when the control portion receives a signal from the driver in such a condition.

Specifically, an instrument panel 440 may be provided, which provides information to the driver (gauge panel), and the instrument panel 440 may include a forced engine stop button that receives the signal from the driver.

In addition, the vehicle control unit 460 may be electrically connected with the ignition switch 410 and the instrument panel 440.

In addition, the vehicle control unit 460 may include a relay control circuit 462, and the relay control circuit 462 controls the current to flow through a relay upon receiving the signal from the instrument panel 440 (more precisely, a forced engine stop button).

In addition, the engine control unit 450 may include: a transmission terminal 452 that transmits an emergency stop current; a receiving terminal 454 for receiving the emergency stop current transmitted from the transmitting terminal 452; an emergency stop circuit 456 electrically connecting the transmission terminal 452 and the reception terminal 454; and a relay 458 that is activated by a relay control current flowing through the relay control circuit 462 and opens and closes the emergency stop circuit 456.

Here, it is preferable that the forced engine stop button is formed to be lighted when the engine control unit 450 is started so as to enable the driver to recognize that it is in a state where the engine control unit 450 is being started and to recognize that it is in a state where the vehicle control unit 460 can be started.

On the other hand, a pilot cut valve 474 may be further provided, and the pilot cut valve 474 may open and close the hydraulic device 200 (more precisely, a flow path between the pump 210 and the hydraulic circuit 220) according to the state of the ignition switch 410.

Specifically, the driving section further includes: an alternator 500 that receives power from the engine 100 and generates electricity; and a battery 600 that stores electricity generated by the alternator 500 and discharges the electricity to various places where electricity is needed, and the pilot cut valve 474 may be formed to receive electricity from the battery 600 through the ignition switch 410 to open and close the hydraulic device 200.

In particular, the pilot cut valve 474 may be formed to close the hydraulic device 200 when the ignition switch 410 is in a closed state.

More specifically, the driving part may further include: a charging wire 710 electrically connecting the battery 600 and the alternator 500; a discharge line 720 electrically connecting the charge line 710 and the input terminal 412 of the ignition switch 410; and a pilot cut line 730 electrically connecting the pilot cut valve 474 and the output terminal 414 of the ignition switch 410.

Here, the ignition switch 410 includes an ignition switch bridge 416, the ignition switch bridge 416 electrically connecting the input terminal 412 and the output terminal 414 in an on state and electrically disconnecting the input terminal 412 and the output terminal 414 in an off state, the ignition switch bridge 416 being operable by a driver.

The pilot cut valve 474 may be electrically connected to the pilot cut line 730 to open and close the hydraulic device 200 by the reciprocating movement of the electromagnetic coil 472, which forms a magnetic field when electricity is applied to the pilot cut line 730.

Here, a pilot cut switch 476 may be further provided for opening and closing the pilot cut line 730, and the pilot cut switch 476 may include: a first port 476a electrically connected to the output terminal 414 of the ignition switch 410; a second port 476b electrically connected to the electromagnetic coil 472; and a pilot cut switch bridge 476c that connects and disconnects the first port 476a and the second port 476b, and the pilot cut switch bridge 476c can be operated by a driver.

Next, the working and effects of the construction machine according to the present embodiment will be described.

First, the ignition switch bridge 416 can be operated by the driver so that the ignition switch 410 is turned on. That is, as shown in fig. 4, the input terminal 412 and the output terminal 414 may be electrically connected.

In this way, the electricity stored in the battery 600 can be supplied to the electric components such as the dash panel 440, the vehicle control unit 460, and the engine control unit 450 through the discharge wire 720, the input terminal 412, the ignition switch bridge 416, and the output terminal 414 to drive the engine 100.

Then, the alternator 500 is driven to generate electricity in conjunction with the engine 100, and the generated electricity can be charged to the battery 600 through the charging wire 710.

On the other hand, a part of the electricity stored in the battery 600 and the electricity generated by the alternator 500 may be applied to the pilot cut line 730 through the discharge line 720, the input terminal 412, the ignition switch bridge 416, and the output terminal 414.

In addition, the driver can operate the pilot cut switch bridge 476c to electrically connect the first port 476a and the second port 476 b. That is, pilot cut switch 476 may be turned on.

Thus, the electricity applied to the pilot cut line 730 can be applied to the electromagnetic coil 472 by the pilot cut switch 476, and a magnetic field is applied to the pilot cut valve 474.

In this way, the pilot cut valve 474 can be moved and the pump 210 can be connected to the hydraulic circuit 220.

In addition, when the pedal and the lever of the boarding portion are operated by the driverSaid lower traveling bodyIs moved to the work site and the boom cylinder, the arm cylinder and the boom cylinder may be activated to perform earth digging or earth cutting work.

Here, the solid arrows shown in fig. 1 illustrate the flow of electricity generated by alternator 500 and discharged after being charged to battery 600, and the dotted arrows illustrate the flow of engine control signals transmitted from engine control unit 450 to engine 100.

Next, the ignition switch bridge 416 can be operated by the driver, so that the ignition switch 410 is switched from the on state to the off state. That is, as shown in fig. 5, the electrical connection between the input terminal 412 and the output terminal 414 may be broken.

Thus, the electricity of the battery 600 is no longer applied to the output terminal 414.

However, the engine control unit 450 may be activated to continue driving the engine 10. That is, the engine control unit 450 may receive power from the battery 600 through a separate line and transmit an engine control signal to the engine 100, and the engine 100 may be continuously driven.

As shown in fig. 7, the time after the engine control unit 450 is started may be counted and the start time of the engine control unit 450 may be compared with a predetermined reference time.

In addition, when the start time of the engine control unit 450 is equal to or less than the reference time, the start of the engine control unit 450 may be maintained; when the activation time of the engine control unit 450 exceeds the reference time, the engine control unit 450 may be stopped to stop the engine 100.

Here, when the engine control unit 450 is started, the alternator 500 is driven together with the engine 100 to generate electricity, and the generated electricity may be charged to the battery 600 through the charging wire 710.

In addition, since the pilot cut line 730 is connected to the output terminal 414, electricity generated by the alternator 500 and electricity charged to the battery 600 may not be applied to the pilot cut line 730. Accordingly, regardless of the state of the pilot cut switch 476 (even if the pilot cut switch is in an open state), no electricity is applied to the electromagnetic coil 472 and no magnetic field is formed, so that the pilot cut valve 474 can be moved by the restoring force generated by the elastic member 478. Thereby, the connection between the pump 210 and the hydraulic circuit 220 is released, and the working unit (not shown) may not be activated.

On the other hand, when the driver presses the forced engine stop button during the engine control unit 450 is started, the vehicle control unit 460 is started, the engine control unit 450 may be interrupted even if the start time of the engine control unit 450 is the reference time or less, and the engine 100 may be stopped.

Specifically, referring to fig. 6 and 7, when the driver presses the forced engine stop button to input a signal, the signal may be transmitted from the instrument panel 440 to the vehicle control unit 460.

In this way, the vehicle control unit 460 may control signals to the relay control circuit 462.

In this way, the relay 458 may be activated and the emergency stop circuit 456 may be opened.

In addition, when the emergency stop current transmitted from the transmission terminal 452 flows to the reception terminal 454 through the emergency stop circuit 456 and the emergency stop current is received by the reception terminal 454, the vehicle control unit 460 may be started and the engine 100 may be stopped.

Here, the one-dot chain line arrow shown in fig. 6 illustrates the flow of the relay control current, and the two-dot chain line arrow illustrates the flow of the emergency stop current.

Here, in the construction machine of the present embodiment, since the engine control unit 450 is provided, it is possible to prevent the engine 100 from stopping when the aftertreatment device (not shown) is in a high temperature state. This can prevent damage to the aftertreatment device (not shown).

In addition, since the vehicle control unit 460 is provided, it is possible to prevent inconvenience and accidents of the driver caused by the engine control unit 450. That is, when it is necessary to stop the engine 100 immediately although the engine control unit 450 is operated (for example, when a driver needs to get out of the work machine urgently, when a fire breaks out, etc.), the engine 100 may be stopped immediately by the driver's operation, and thus inconvenience when the driver needs to board a boarding portion until the engine 100 stops, a vehicle fire, and injury to the driver may be prevented.

In addition, since the pilot cut valve 474 is formed to open and close the hydraulic device 200 in accordance with the state of the ignition switch 410, an accident caused by the engine control unit 450 can be prevented in advance. That is, since the pilot cut valve 474 is connected to the output terminal 414 of the ignition switch 410 and is not connected to the charging wire 710 and the discharging wire 720, no electricity can be applied to the electromagnetic coil 472 regardless of the state of the pilot cut switch 476 when the ignition switch 410 is in the off state. Accordingly, even if the driver inadvertently turns on the pilot cut switch 476 to move the pedal and the control lever in a state where the engine control unit 450 is operated to drive the engine 100, the working unit (not shown) may not be activated. This prevents the working unit (not shown) from hitting the surrounding objects or people.

On the other hand, in the case of the present embodiment, it is formed to receive a signal from the driver through the instrument panel 440 (more precisely, a forced engine stop button) to cause the vehicle control unit 460 to be activated, but is not limited thereto.

May be configured to receive a signal from the driver through the ignition switch 410 to cause the vehicle control unit 460 to be activated. That is, for example, it may be formed such that, when the ignition switch 410 is switched from the off state to the on state within a predetermined time and then switched to the off state, so that the signal is input through the ignition switch 410 and transmitted from the ignition switch 410 to the vehicle control unit 460, a relay control current flows through the relay control circuit 462, the relay 458 is activated, and the emergency stop circuit 456 is opened, and the emergency stop current transmitted from the transmission terminal 452 is received by the reception terminal 454, so that the vehicle control unit 460 is activated.

Alternatively, the vehicle control unit 460 may be automatically activated according to the vehicle state of the construction machine regardless of the intention of the driver. That is, for example, it may be formed such that the vehicle control unit 460 is activated when at least one of the electrical connection between the engine control unit 450 and the vehicle control unit 460, the electrical connection between the dash panel 440 and the vehicle control unit 460, and the electrical connection between the ignition switch 410 and the vehicle control unit 460 is disconnected.

On the other hand, in the case of the present embodiment, in order to doubly prevent the pilot cut valve 474 from being activated by mistake, the pilot cut line 730 is connected to the output terminal 414 of the ignition switch 410, and the pilot cut switch 476 is provided, but the pilot cut switch 476 may be omitted.