JP5978606B2 - Construction machine control equipment - Google Patents

Description

  The present invention relates to a control device for automatically stopping an engine in a construction machine such as an excavator in order to save fuel, reduce exhaust gas, and reduce noise when not working.

  Conventionally, as this type of technology, as shown in Patent Documents 1 and 2, when a preset auto-stop condition (for example, the gate lever that opens and closes the cabin door) is established, A technique for automatically stopping the engine when not working is known.

JP 2004-240676 A

  However, in the known technology, no consideration is given to the power supply processing after the engine is automatically stopped, and the power supply (capacitor) and the electric / electronic equipment including the control unit remain connected.

  In this case, since the automatic stop control is to stop the engine regardless of the operator's intention, the operator often does not recognize that the engine is stopped while the power is on.

  For this reason, there has been a risk that the battery will be discharged over a long period of time, resulting in a reduction in power (so-called battery exhaustion).

  Therefore, the present invention provides a control device that can prevent a reduction in the power of a capacitor after an automatic engine stop in a construction machine having an auto-stop function.

As means for solving the above problems, in the present invention, an engine as a power source that is started / stopped based on an operation of an engine switch, and an automatic stop control that automatically stops the engine when a preset auto-stop condition is satisfied. Engine control means for performing power storage, a battery as a power source for electric / electronic equipment including the engine control means, power supply control means for controlling power supply / cutoff from the battery to the electric / electronic equipment, and the engine switch; re above for restart command and means, after the automatic stop of the engine by the automatic stop control, the engine control means definitive within a preset delay time for sending a command for engine restart in the engine control unit in a different path determines the presence of engine restart command from the start command means, within the window time While the engine control means to restart the engine when there is an engine restart command, the power of the power control means when no engine restart command within the grace period to the electrical and electronic equipment from said condenser It is configured to perform power shut-off control that automatically stops supply.

  According to this configuration, after the engine is automatically stopped by the automatic stop control, the power supply is automatically shut off to the electric / electronic equipment including the engine control unit. It is possible to prevent power reduction of the battery.

In addition , since the operator may perform a restart operation (the gate lever closing operation in claim 2 ) for resuming the work immediately after the automatic stop, the power supply is not shut off within a certain time in preparation. Thereby, it is possible to resume the work without operating the engine switch, and the work efficiency can be increased.

In the present invention, includes a power-off warning means, the engine control unit, before the execution of the power-off control, it is desirable to configure so as to warn the power-off to the power-off warning means (claim 3) .

  By doing so, it is possible to warn the operator of power-off and recognize it.

In this case, in the invention combining claims 1 , 2 and claim 3 , when there is no restart command within the grace period, the power is shut off after the warning. It can also be recognized that the engine cannot be restarted, that is, restart is possible only by operating the engine switch.

Further, in the present invention, a power shut-off display means is provided, and the control means supplies power to the power shut-off display means during the previous operation when an engine start operation is performed by the engine switch after execution of the power shut-off control. It is desirable that the automatic shut-off be displayed (claim 4 ).

  By doing so, it is possible to appeal to the operator that the power was cut off, not a failure, and that the automatic control was performed, particularly when the operator did not recognize the automatic power cut-off.

  According to the present invention, in a construction machine having an auto-stop function, it is possible to prevent a reduction in the power of the battery after the engine is automatically stopped.

It is a block block diagram of the control apparatus which concerns on embodiment of this invention. It is a flowchart which shows the control content by the same apparatus. It is a flowchart for demonstrating the display effect | action at the time of the next engine starting by the apparatus.

  The embodiment is applied to an excavator.

  FIG. 1 shows a block configuration of a control device according to the embodiment. In FIG. 1, signal lines for exchanging signals between blocks are indicated by lines with arrows, and power lines for transferring power are indicated by lines without arrows.

The engine 1 as a power source is started by a cell motor, and the rotation speed and stop are controlled by a governor control unit (both not shown).

  A hydraulic pump 2 is connected to the engine 1, and oil discharged from the hydraulic pump 2 is sent to the actuator circuit 3 via a hydraulic pilot switching type control valve operated by a remote control valve (not shown).

  The controller 4 includes an engine control unit 5 as an engine control unit that controls the engine 1 (cell motor and governor control unit), and a power source that controls power supply from the capacitor 6 as a power source to the electric / electronic equipment including the engine control unit 5. And a power control unit 7 as control means.

  The engine control unit 5 receives a start signal from an engine switch (key switch) 8 and a gate lever opening / closing signal from a limit switch 9 for detecting opening / closing of a gate lever 9 for opening / closing a cabin entrance / exit.

  The engine control unit 5 starts the engine 1 based on the start signal, and automatically stops the engine 1 based on a gate lever opening signal (signal indicating that the operator has exited = auto stop condition signal).

  In other words, when the gate lever 9 is opened, the engine 1 is automatically stopped on the assumption that the auto-stop condition is satisfied.

  The engine control unit 5 restarts the engine 1 using an engine restart command when a gate lever closing signal is input after the engine is automatically stopped.

  That is, in this embodiment, the limit switch 10 includes means for outputting an auto-stop condition signal toward the engine control unit 5, and restart command means for sending a restart command to the engine control unit 5 through a different path from the engine switch 8. Doubles as

  On the other hand, after the engine 1 is automatically stopped, the power supply control unit 7 performs power supply cutoff control for cutting off the power supply from the battery 6 to the electrical / electronic equipment.

  Specifically, for example, a relay and a relay contact are connected to a power circuit, and when the auto-stop condition is satisfied, the relay contact is turned off to cut off the power.

  The engine switch 8 has three positions, “OFF”, “ON”, and “START”. The power is turned off at the “OFF” position, the power is turned on at the “ON” position, and the engine 1 is started at the “START” position. To do.

  In addition, a display 11 serving both as a power shut-off warning means and a power shut-off display means is provided in the cabin. By this display 11, the power is turned off before the power shut-off control is executed based on the signal from the power control unit 7. A warning that “shut off” is issued with one or both of voice and character display, while “the power was automatically shut off during the previous operation” when the engine start operation was performed by the engine switch 8 after the engine was automatically stopped. Display is performed in one or both of letters and sounds.

  Detailed contents of the control will be described with reference to FIGS.

  Control starts with engine operation, and it is determined in step S1 whether or not an automatic stop condition is satisfied (whether or not the gate lever 9 is opened).

  Here, if NO, the process does not proceed to the next step, and if YES, the engine 1 is automatically stopped in step S2.

  After this automatic engine stop, a timer count reset is performed in step S3, and a timer count up (time counting start) operation is performed in step S4.

  In the subsequent step S5, it is determined whether or not an engine restart command has been issued. If YES (there is a restart command), the engine 1 is restarted in step S6 and the process returns to step S1.

  On the other hand, if NO (no restart command), it is determined in step S7 whether or not a preset grace time has elapsed. If NO, the process returns to step S5.

  In the case of YES, after memorizing that the power has been turned off in step S8, a warning is issued by the display 11 in step S9, the power is shut off, and the control ends.

  FIG. 3 shows the processing contents when the engine 1 is started by the engine start operation of the engine switch 8 by the operator after the power is shut off. In step S11, it is determined whether or not the power was automatically turned off last time. Then, the display 11 displays a message such as “Power is automatically turned off” as shown in FIG. 1 (step S12).

  The engine is started by first returning the engine switch 8 to the “OFF” position and then operating from the “ON” position to the “START” position. The power is turned ON at the “ON” position, and the above steps are performed. The display of S12 is performed.

  In this way, after the engine 1 is automatically stopped by the automatic stop control, the power source (capacitor 6) is automatically shut off to the electric / electronic equipment including the engine control unit 5, so that the power connection state remains after the engine is automatically stopped. It is possible to prevent a decrease in power (so-called battery rise) of the battery 6 due to being left unattended.

  In addition, since the power is not shut off during the grace period after the engine is automatically stopped, in other words, if the operator performs a restart operation within the grace time, the power is not shut off, so that the work can be resumed without operating the engine switch 8, Work efficiency can be increased.

  Furthermore, since the power supply cutoff is warned by the display 11 before the power cutoff control is executed, it is possible to make the operator recognize that the power is automatically cut off.

  In this case, in the embodiment, when there is no restart command within the grace period, the power is shut off after the warning. Therefore, the engine 1 cannot be restarted by a restart operation (gate lever closing operation) to the operator. That is, it can be recognized that the restart is possible only by operating the engine switch 8.

  In addition, when the engine start operation is performed by the engine switch 8 after the power shut-off control is performed, the display 10 displays that the power was automatically shut off during the previous operation. If it is not, it is not a failure that the power supply was cut off, but it can be appealed to the operator that the automatic control was performed.

Other embodiments
(1) In the above embodiment, the auto-stop condition is that the gate lever 9 is opened. However, in place of or in addition to this, there is no operation of the operation lever that controls the operation of the actuator, or no operation. A configuration may be adopted in which the operation is continued for a certain period of time as an auto stop condition.

  (2) As a restart command means, a sensor for detecting that a plurality of operating levers are gripped, or that the operating levers are operated in a preset pattern (for example, operating from the neutral position to the operating position) A switch may be used.

  Alternatively, a configuration may be adopted in which a manual restart switch (for example, a push button switch) is provided and an ON signal of the restart switch is sent to the engine control unit 5 and the power supply control unit 7 as a restart command.

  (3) A means for locking / unlocking the operation of the hydraulic actuator in accordance with the automatic stop / restart of the engine 1 may be provided.

  Specifically, a hydraulic lock valve may be provided in a hydraulic pilot line for supplying pilot pressure to the control valve, and the hydraulic lock valve may be operated based on an auto stop condition signal and unlocked based on a restart command. .

  (4) In the above embodiment, one display is provided as a power warning display means for issuing a warning before the power is turned off, and a power cutoff display means for displaying that the power was automatically shut down during the previous operation when the engine is started after the power cutoff control is executed. Although the configuration also used as the vessel 11 is adopted, both display means may be provided separately.

  (5) The present invention is not limited to shovels and can be widely applied to construction machines that perform auto-stop control.

1 Engine 4 Controller 5 Engine control section (Engine control means)
6 Battery 7 Power supply control unit (Power supply control means)
8 Engine switch 9 Gate lever 10 Limit switch 11 Display

Claims (4)

An engine as a power source that starts / stops based on an operation of an engine switch, an engine control unit that performs auto-stop control for automatically stopping the engine when a preset auto-stop condition is satisfied, and the engine control unit A power storage device as a power source for the electrical / electronic equipment, a power supply control means for controlling power supply / interruption from the electrical storage equipment to the electrical / electronic equipment, and the engine control means for restarting the engine via a separate path from the engine switch. and a restarting command means for sending a command, determining whether the engine restart command from the restart command means for the automatic stop control after the automatic stop of the engine by said engine control means definitive within a preset delay time And engine control when there is an engine restart command within the grace period. While stage to restart the engine, so that the power control means performs power-off control for automatically stopping the power supply to the electrical and electronic equipment from the capacitor when no engine restart command within the grace period A construction machine control device characterized in that it is configured as described above. A gate lever for opening / closing an entrance / exit of an operator, and a gate lever opening / closing detection means as the restart command means for detecting opening / closing of the gate lever, wherein the power control means is configured to receive the gate from the gate lever opening / closing detection means. construction machine control system according to claim 1, wherein the configuring the lever is closed signal to the engine restart command. A power cutoff warning means, the engine control unit, before the execution of the power-off control, according to claim 1 or 2, characterized by being configured so as to warn the power-off to the power-off alarm means Control device for construction machinery. A power shut-off display means, and the control means indicates that the power shut-off display means automatically shuts off the power during the previous operation when an engine start operation is performed by the engine switch after the power shut-off control is executed. The construction machine control device according to any one of claims 1 to 3 , wherein the control device is configured to display.

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