JP5493136B2 - Control device for work machine - Google Patents

Description

  The present invention relates to a control device for a working machine that automatically stops an engine when not working (auto idling stop) for the purpose of saving fuel, reducing exhaust gas and noise, and the like.

  When a preset auto-stop condition (for example, the gate lever that opens / closes the cabin door is opened) is satisfied, the engine is restarted in an engine control device for a construction machine that automatically stops the engine when it is not working. In order to ensure safety while eliminating the hassle of an engine, a restart switch is provided, and when the restart switch is operated after the engine has been automatically stopped, the engine control unit is restarted by a different route from the engine switch. There is a control device for a construction machine that sends a command and restarts the engine (see, for example, Patent Document 1).

Japanese Patent No. 4010255

  In the above-described control device, when the restart switch is provided, for example, on the grip of the operation lever, an operation feeling different from the normal lever operation feeling may be given to the operator.

  Further, the durability of the operation lever provided with the restart switch is different from the case of the operation lever body alone, and the durability of the new device needs to be guaranteed. For this reason, the cost of the experiment etc. for implement | achieving durability guarantee with the cost of the restart switch itself is needed, and the raise of the cost of manufacturing cost cannot be avoided.

  Further, in a hydraulic excavator or the like, a control circuit using a pilot-operated operation lever is usually used. Therefore, if the control circuit is configured by an electric operation lever, there is a problem that the cost increases.

  Furthermore, after the engine is automatically stopped, it may not be possible to restart by operating the restart switch for some reason. In such a case, it is necessary to notify the operator that the engine cannot be restarted by operating the restart switch and to notify that the engine can be restarted by operating the engine switch, for example.

  The present invention has been made on the basis of the above-described matters, and its purpose is to be used in a normal hydraulic excavator as a restart command generation means for an engine in a work machine that automatically stops the engine when the work machine is not in operation. The pilot pressure sensor is used to minimize the cost increase of the device, and when the engine automatically stops, the vehicle body condition is monitored and detected at the time of restart, and the engine is restarted by the restart command signal When it is impossible, a control device for a work machine is provided that promptly notifies an operator of engine restart or the like by operating an engine switch.

To achieve the above object, the first invention provides an engine as a power source that is started by a cell motor based on an operation of an engine switch, a hydraulic pump and a pilot oil pump driven by the engine, and the hydraulic pump. A plurality of hydraulic actuators having a drive source as a drive source, a plurality of operating bodies for commanding operation of the plurality of hydraulic actuators, and a control for controlling the direction and flow rate of pressure oil supplied from the hydraulic pump to the plurality of hydraulic actuators A valve, a pilot oil passage for supplying pressure oil from the pilot oil pump to the operation portion of the control valve via the operation body, and the engine is automatically stopped when a preset auto idling stop condition is satisfied. With engine control means capable of performing auto idling stop control A pressure sensor that detects a pressure of the pilot oil passage that fluctuates according to an operation of the operating body; and a pressure oil that is connected to the pilot oil passage and discharged by the pilot oil pump is temporarily accumulated. Accumulator, detecting means for detecting a pressure accumulation state of the accumulator, switching means for introducing the pressure oil accumulated in the accumulator into the pilot oil passage between the pilot oil pump and the operating body, and the pressure A control unit that takes in a command signal from a sensor and a detection signal from the detection unit, and outputs a restart command to the engine control unit in order to restart the engine after the engine has been automatically stopped ; The control means determines an elapsed time after the engine is stopped by the auto idling stop control. In the idling stop elapsed time calculating means for calculating and the idling stop elapsed time calculating means, if the engine restart command is not output after a predetermined time has elapsed, the engine restart command is invalidated. And a first monitor instruction means for outputting an engine restart instruction signal by operating the engine switch, and when the engine restart instruction is invalidated by the restart instruction invalidating means, the engine restart instruction Is further provided with first monitoring means for displaying to the operator a disabled instruction and a restart instruction from the first monitor instructing means .

In a second aspect based on the first aspect , the control means takes in a pressure accumulation state of the accumulator detected by the detection means and determines whether or not an engine restart command can be output. And a second monitor instruction means for outputting an engine restart instruction signal by operating the engine switch when the restart possibility determination means determines that the engine restart command cannot be output. And a second monitoring means for displaying to the operator a result of determination by the restart possibility determination means and a restart instruction from the second monitor instruction means.

Furthermore, a third invention, in the first inventions, between the mechanically bonded motor the engine and the drive shaft, a power storage device for supplying electrical energy to said electric motor, and said power storage device and the electric motor Power conversion means for converting the electrical energy of the battery, and storage amount detection means for detecting the storage amount stored in the power storage device, wherein the control means captures the storage state detected by the storage amount detection means In the second restart possibility determining means for determining whether or not the engine restart command can be output by starting the motor and the second restart possibility determining means, the engine restart command cannot be output by starting the motor. when it is judged that, a third monitor instruction means for outputting an engine restart instruction signal by the starter motor by operating the engine switch, the second Wherein the result of the determination of the start allowability determining means and the restart instruction from the third monitor indication means further comprises a third monitoring means for displaying to an operator.

  According to the present invention, the pilot pressure sensor is provided as the engine restart command generating means, and the display signal instructing whether or not the engine can be restarted by the restart command signal from the pilot pressure sensor is output. In addition to minimizing the cost increase, the operator can quickly select the restart method, so that smooth work can be performed.

It is a perspective view showing a hydraulic excavator provided with one embodiment of a control device of a working machine of the present invention. 1 is a system configuration diagram showing an actuator drive system of a hydraulic excavator provided with an embodiment of a control device for a work machine according to the present invention. It is a control block diagram which shows the structure of one Embodiment of the control apparatus of the working machine of this invention. It is a flowchart figure which shows the processing content of one Embodiment of the control apparatus of the working machine of this invention.

  Embodiments of a control device for a work machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a hydraulic excavator provided with an embodiment of a control device for a work machine according to the present invention.

  As shown in FIG. 1, a hydraulic excavator 1 having an embodiment of a control device for a work machine according to the present invention is an articulated front composed of a boom 1a, an arm 1b, and a bucket 1c that rotate in the vertical direction. The apparatus 1A includes a vehicle body 1B including an upper swing body 1d and a lower traveling body 1e, and a base end of the boom 1a of the front apparatus 1A is supported by a front portion of the upper swing body 1d.

  The boom 1a is supported by the front part of the upper swing body 1d so as to be able to move up and down, and is driven by a boom cylinder (hydraulic cylinder) 3a. The arm 1b is rotatably supported by the boom 1a and is driven by an arm cylinder (hydraulic cylinder) 3b. The bucket 1c is rotatably supported by the arm 1b and is driven by a bucket cylinder (hydraulic cylinder) 3c. The upper swing body 1d is driven to swing by a swing motor (hydraulic motor) 3d (see FIG. 2), and the lower traveling body 1e is driven by left and right travel motors (hydraulic motors) 3e, 3f (see FIG. 2). Driving of the boom cylinder 3a, arm cylinder 3b, bucket cylinder 3c, and swing motor 3d is controlled by operating devices 4a and 4b (see FIG. 2) installed in the cab of the upper swing body 1d and outputting hydraulic signals. Is done.

  FIG. 2 is a system configuration diagram showing an actuator drive system of a hydraulic excavator provided with an embodiment of a control device for a work machine according to the present invention. In FIG. 2, the same reference numerals as those shown in FIG. 1 are the same or corresponding parts, and the description thereof is omitted.

  In FIG. 2, the hydraulic power source device includes a hydraulic pump 6, a pilot oil pump 7 that supplies pilot pressure oil, and a hydraulic oil tank 8. The hydraulic pump 6 and the pilot oil pump 7 are connected by the same drive shaft, and are driven by an engine 9 and an electric motor 10 connected in series with the drive shaft. A pulley 23a is provided on the drive shaft between the electric motor 10 and the hydraulic pump 6, and is connected to the rotation shaft of the cell motor 23 via a belt 23b.

  In the oil passage 30 for supplying the pressure oil from the hydraulic pump 6 to the boom cylinder 3a to the traveling motor 3f, a relief valve 30A for restricting the pressure oil pressure in the oil passage and a control valve for controlling the direction and flow rate of the pressure oil. 5a to 5f are provided. The control valves 5a to 5f switch the spool position by supplying pilot pressure oil from the pilot secondary side oil passages 44a to 44f to the pilot operation section, and supply the pressure oil from the hydraulic pump 6 to each hydraulic actuator. Thus, the arm 1b and the like are driven.

  The spool positions of the control valves 5a to 5f are switched by operating the operation levers of the operation devices 4a and 4b. The operating devices 4a and 4b are configured to supply pilot primary pressure oil supplied from the pilot oil pump 7 or the accumulator 18 through the pilot primary side oil passages 40 to 43 by operating the operation lever or the like. 44f is supplied to the pilot operating portions of the control valves 5a to 5f, or is returned to the hydraulic oil tank 8 through the oil discharge passage 45.

  Any one of the pilot secondary side oil passages 44a to 44f is provided with a pressure sensor 21 for detecting the pilot oil secondary pressure, and the detected pilot oil secondary pressure signal is sent to the main control unit 2 (hereinafter referred to as MCU2). Entered.

  The pilot primary side oil passage 41 that connects one end side to the operating devices 4a and 4b has the other end side connected to the output portion of the shuttle valve 15, and the gate lock electromagnetic switching valve 20 is provided in the middle portion. The gate lock electromagnetic switching valve 20 switches communication / blocking of the pilot primary oil passage 41 in accordance with a command from the MCU 2.

  The shuttle valve 15 includes two input parts and one output part, and discharges high-pressure pressure oil from the output part among the pressure oils input to either of the input parts. One input portion of the shuttle valve 15 is connected to one end side of the pilot primary side oil passage 40, and the other input portion is connected to one end side of the pilot primary side oil passage 42.

  The pilot primary side oil passage 40 is connected to the discharge portion of the pilot oil pump 7 at the other end, and a relief valve 40A that restricts the pressure oil pressure in the oil passage to the middle portion and prevents impurities from entering downstream. And a filter 14 is provided.

  The pilot primary side oil passage 42 is connected to the discharge part of the accumulator 18 that accumulates hydraulic oil at the other end, and the pressure sensor 19 and accumulator for detecting the pressure of the pressure oil accumulated in the accumulator 18 at the intermediate part. An electromagnetic switching valve 17 is provided. The detected pilot oil primary pressure signal is input to the MCU 2, and the accumulator electromagnetic switching valve 17 switches communication / blocking of the pressure oil accumulated in the accumulator 18 to the pilot primary side oil passage 42 in accordance with a command from the MCU 2.

  Branch portions are provided in the vicinity of one end side of the pilot primary side oil passage 40 and in the vicinity of one end side of the pilot primary side oil passage 42, and these branch portions are connected by the pilot primary side oil passage 43. Yes. The check valve 16 is provided in the pilot primary side oil passage 43, and the check valve 16 receives the pilot oil from the pilot oil pump 7 through the pilot primary side oil passage 40 and the pilot primary side oil passage 43. Although it is allowed to communicate with the side oil passage 42, the pressure oil from the accumulator 18 is prevented from communicating with the pilot primary side oil passage 40 through the pilot primary side oil passage 42 and the pilot primary side oil passage 43.

  The electric motor 10 is driven by the electric energy stored in the storage battery 12 via the chopper / inverter device 11 which is a power conversion mechanism, and assists the driving output by the engine 9 to assist the hydraulic pump 6 and the pilot oil pump 7. It has a function to do. On the other hand, when the output from the engine 9 is excessive, the electric power 10 is regeneratively controlled to charge the generated battery energy to the storage battery 12 via the chopper / inverter device 11.

FIG. 3 is a control block diagram showing the configuration of the embodiment of the control device for the work machine of the present invention. In FIG. 3, the same reference numerals as those shown in FIGS.
In FIG. 3, the MCU 2 includes an input unit, a calculation unit, and an output unit. The calculation unit includes a lock lever control unit 2a, a lever pilot pressure control unit 2b, a battery charge amount calculation unit 2c, an idle stop condition determination unit 2d, an accumulator pressure accumulation calculation unit 2e, a monitor control unit 2f, and an assist motor. A control unit 2g, an accumulator opening / closing control unit 2h, and an engine control unit 2j are provided.

  The lock lever control unit 2a inputs the open / close status of the gate lock lever 22, and outputs an open / close command to the gate lock electromagnetic switching valve 20 depending on the position. For example, when the gate lock lever 22 is in a position (push-down position) for closing the entrance of the cab, the gate lock electromagnetic switching valve 20 is switched to the communication position, and the pressure oil is guided to the operating devices 4a and 4b. Thereby, the operation of the control valves 5a to 5f by the operation devices 4a and 4b is validated. When the gate lock lever 22 is in a position (pickup position) that opens the cab entrance, the gate lock electromagnetic switching valve 20 remains in the shut-off position, and pressure oil from the pilot oil pump 7 or the accumulator 18 is supplied to the operating device. It is not introduced into 4a and 4b. Thereby, operation of control valve 5a-5f by operating device 4a, 4b is invalidated.

  The lever pilot pressure control unit 2b inputs a signal from the pressure sensor 21 for detecting the pilot oil secondary pressure provided in any of the pilot secondary side oil passages 44a to 44f, and uses it as a signal of the restart command generating means. Recognizing and outputting to the assist motor control part 2g.

  The battery charge amount calculation unit 2c inputs a signal from a detector (not shown) for detecting the charge amount of the battery 12, such as a voltage value, via the chopper / inverter device 11, and calculates a predetermined value and the charge amount. A comparison is made and output to the monitor control unit 2f and the assist motor control unit 2g.

  The idle stop condition determination unit 2d inputs, for example, the state of the idle stop switch 28 provided in the cab and outputs an ON or OFF signal to the monitor control unit 2f, the assist motor control unit 2g, and the accumulator opening / closing control unit 2h. doing.

  The accumulator accumulator 2e receives a signal from the pressure sensor 19 that detects the pressure of the pressure oil accumulated in the accumulator 18, compares the predetermined value with the detected pressure, and monitors the monitor controller 2f and accumulator. It outputs to the opening / closing control part 2h.

  The monitor control unit 2f inputs outputs from the battery charge amount calculation unit 2c, the idle stop condition determination unit 2d, and the accumulator pressure accumulation calculation unit 2e, and outputs various information to, for example, a monitor 26 provided in the cab. Yes.

  The assist motor control unit 2g inputs outputs from the lever pilot pressure control unit 2b, the battery charge amount calculation unit 2c, and the idle stop condition determination unit 2d, and supplies a regenerative control signal and power running of the motor 10 to the chopper / inverter device 11. Outputs torque commands such as control signals. The torque command is output to the engine control unit 2j.

  The accumulator open / close control unit 2h inputs signals from the idle stop condition determination unit 2d and the accumulator pressure accumulation calculation unit 2e, and outputs an open / close command to the accumulator electromagnetic switching valve 17. For example, even if the pilot oil pump 7 is stopped, the accumulated pilot oil can be supplied to the operating devices 4a and 4b by opening the accumulator electromagnetic switching valve 17.

  The engine control unit 2j includes, for example, a rotation speed command from a rotation speed command means 25 provided in the cab, an ON / OFF signal from the same engine start switch 27, and an output signal from the battery charge amount calculation unit 2c. And an output signal from the assist motor control unit 2g, and an engine control command is output to the engine controller 13 (hereinafter referred to as ECU) and the cell motor control unit 24. For example, when a preset auto-idling stop condition is satisfied, an engine control command for performing auto-idling stop control for automatically stopping the engine 9 is output to the ECU 13.

  In addition, although not shown in figure, the idling stop elapsed time calculating means which calculates the elapsed time after the engine 9 stopped by auto idling stop control is provided.

  The ECU 13 controls the fuel injection amount and the rotation speed of the engine 9 based on the engine control command from the MCU 2 so that the predetermined engine rotation speed is obtained.

  The cell motor control unit 24 controls the cell motor 23 to start rotation when starting the engine based on an engine control command from the MCU 2.

  FIG. 4 is a flowchart showing the processing contents of the embodiment of the control device for the work machine according to the present invention. In FIG. 4, the same reference numerals as those shown in FIGS. 1 to 3 are the same or corresponding parts, and the description thereof is omitted.

  First, in step (S100), the engine is started. Specifically, the cell motor 23 is started via the cell motor control unit 24 by the rotation of the engine start switch 27 by the operator. When the cell motor 23 is started, the drive shaft of the engine 9 is rotated and the engine 9 is started.

  In step (S101), the rotational speed of the engine 9 is increased. Specifically, the engine speed is increased to a predetermined engine speed via the ECU 13 in accordance with a command from the engine speed command means 25.

  In step (S102), the state of the idle stop switch 28 is determined. If it is determined to be ON, the process proceeds to step (S103). If NO is determined, the process is repeated until YES is determined.

  In step (S103), the pressure accumulation value of the accumulator 18 is determined. Specifically, a signal from the pressure sensor 19 that detects the pressure of the pressure oil accumulated in the accumulator 18 is input, and it is determined whether or not the pressure is 3 Mpa or less, which is a predetermined value. If YES is determined, the process proceeds to step (S104), and if NO is determined, the process proceeds to step (S105). Here, the reason why the predetermined value (pressure of the pressure oil accumulated) is determined to be 3 Mpa is whether the accumulator 18 has a sufficient pressure accumulation amount that can operate a plurality of actuators in the present embodiment. It is determined as an example for checking whether or not, and is not limited to this value.

  In step (S104), accumulator 18 is accumulated. Specifically, the accumulator electromagnetic switching valve 17 is switched to the communication position, and the pressure oil discharged from the pilot oil pump 7 is supplied to the pilot primary side oil passage 40, the pilot primary side oil passage 43, the check valve 16, and the pilot primary side. The oil is introduced into the accumulator 18 through the oil passage 42 and accumulated. After step (S104), the process returns to step (S103) again.

  In step (S105), the accumulator electromagnetic switching valve 17 is switched to the shut-off position, and the pressure oil accumulated in the accumulator 18 is sealed.

  In step (S106), it is determined whether or not the operating devices 4a and 4b have not been operated for a certain period of time. A condition judgment for so-called idle stop is performed. Specifically, it is determined whether or not the lever operation stop time of the operation devices 4a and 4b is 20 seconds or longer. If YES is determined, the process proceeds to step (S107), and if NO is determined, the process returns to step (S103). Here, the fixed time of 20 seconds is determined as an example in the present embodiment, and is not limited to this value.

  In step (S107), the charge amount of the battery 12 (hereinafter referred to as SOC) is determined before the idle stop. When the amount of charge of the battery 12 is small, a malfunction such as being unable to start after the engine 9 is stopped is predicted, so the automatic stop of the engine 9 is prevented. Specifically, it is determined whether or not the signal from the detector that detects the charge amount of the battery 12, such as a voltage value, is 25% or more of the rated charge amount that is a predetermined value. If YES is determined, the process proceeds to step (S109), and if NO is determined, the process proceeds to step (S108). Here, the reason that the charge amount is set to 25% of the rated charge amount is determined as an example in the present embodiment, and is not limited to this value.

  In step (S108), the operator is notified by displaying on the monitor 26 device in the cab that the SOC of the battery 12 is insufficient. The notified operator may raise the SOC by regeneratively controlling the electric motor 10, for example, but may continue the work without causing the regenerative control. In this state, the idle stop is only prevented, and the work using the work machine can be continued. The operator is also informed that the engine 9 cannot be stopped as an idle stop. After step (S108), the process returns to step (S103) again.

  In step (S109), the engine 9 is stopped. Specifically, an engine stop signal is output to the ECU 13 to stop the engine 9.

In step (S110), the filling of the pressure oil in the pilot primary side oil passage 41 is ensured. Since the pilot oil pump 7 is also stopped when the engine 9 is stopped, no pressure oil is supplied from the pilot primary side oil passage 40. Therefore, a communication command is output to the accumulator electromagnetic switching valve 17, and the pressure oil accumulated in the accumulator 18 is supplied to the pilot primary side oil passage 41 via the pilot primary side oil passage 42 and the shuttle valve 15.

  In step (S111), it is determined whether or not the operating devices 4a and 4b have not been operated for a certain time from the start of the stop of the engine 9. In the case of a long stop, there is a possibility that the operator may be changed, so it is necessary to determine the restart method, and this condition determination is performed. Specifically, it is determined whether or not the lever operation stop time of the operation devices 4a and 4b is 10 minutes or longer. For example, in an idling stop elapsed time calculating means for calculating an elapsed time after the engine 9 has been stopped by auto-idling stop control, whether or not an engine restart command is output after a predetermined fixed time of 10 minutes has elapsed. Judgment is made. If YES is determined, the process proceeds to step (S112), and if NO is determined, the process proceeds to step (S113). Here, the fixed time of 10 minutes is set as an example in the present embodiment, and is not limited to this value.

  In step (S112), the operator's cab monitor 26 device warns that there has been no operation for 10 minutes or more, and displays to the operator that the engine start switch 27 is once turned off and restarted by the cell motor 23. This is because it is preferable to restart from a standard state for safety because there is a possibility of operator change. After step (S112), the process proceeds to step (S119) described later.

  In step (S113), the accumulated pressure value of the accumulator 18 is determined. A signal from a pressure sensor 19 that detects the pressure of the pressure oil accumulated in the accumulator 18 is input, and it is determined whether or not the pressure is 0.6 Mpa or more, which is a predetermined value. If YES is determined, the process proceeds to step (S115), and if NO is determined, the process proceeds to step (S114). Here, the predetermined value is determined to be 0.6 MPa, in this embodiment, when the primary pressure on the pilot oil decreases due to leakage from the accumulator electromagnetic switching valve 17, a restart command is generated. Since the function as a means is not secured, it is determined as an example for checking whether or not a pressure capable of ensuring this function is provided, and is not limited to this value.

  In step (S114), the operator's cab monitor 26 warns that the accumulator 18 is insufficiently accumulating pressure, and displays to the operator to temporarily turn off the engine start switch 27 and restart with the cell motor 23. After step (S114), the process proceeds to step (S119) described later.

  In step (S115), a restart command for outputting the restart command is generated. Specifically, a signal from the pressure sensor 21 that detects the pilot oil secondary pressure is input, and a determination is made as to whether or not it is a predetermined value of 1 Mpa or more. If YES is determined, the process proceeds to step (S115a), and if NO is determined, the process proceeds to step (S115b). If the pilot oil secondary pressure is 1 MPa or more, it is determined that the pressure has increased because the operator has once operated the operation devices 4a and 4b, and flag 1 = 1 is set in step (S115a).

  In step (S115b), when the pilot oil secondary pressure is 1 MPa or less, it is determined whether or not flag 1 = 1 and the pilot oil secondary pressure is 0.4 MPa or less. If YES is determined, the process proceeds to step (S116), and the restart sequence is continued. If NO is determined, the process returns to step (S115). As described above, if the operating devices 4a and 4b are operated and the predetermined secondary pressure of the pilot oil is not changed, the restart sequence does not proceed. Therefore, the operator's intention to restart becomes clear and safety is improved. .

  In step (S116), it is determined again whether the SOC of battery 12 is 25% or more of the rated charge amount which is a predetermined value. If YES is determined, the process proceeds to step (S118), and if NO is determined, the process proceeds to step (S117). Here, the SOC of the battery 12 is confirmed again because the SOC may be lowered while the engine is stopped even if it is 25% or more at the time of step (S107).

  In step (S117), the monitor 26 device in the cab warns that the SOC of the battery 12 is insufficient, and displays to the operator that the engine start switch 27 is temporarily turned off and the cell motor 23 is restarted.

  In step (S119), the engine start switch 27 is temporarily turned off by the operator, and in the next step (S120), the process returns to the start.

  In step (S118), so-called automatic restart is performed. Specifically, electric power is supplied from the battery device 12 to the electric motor 10 via the chopper / inverter device 11, and the electric motor 10 is started. When the electric motor 10 starts, the drive shaft of the engine 9 rotates and the engine 9 starts. After step (S118), the process returns to step (S103) again.

  According to the embodiment of the control device for a work machine of the present invention described above, the pilot pressure sensor 21 is provided as the restart command generation means for the engine 9, and the engine restart of the engine 9 based on the restart command signal from the pilot pressure sensor 21 is provided. Since the display signal for instructing the availability is output, the increase in the cost of the apparatus is minimized, and the operator can quickly select the restarting method, so that a smooth operation can be performed.

  Further, according to the embodiment of the control device for a work machine of the present invention described above, the monitor device 26 allows the operator to quickly grasp that the restart command for the engine 9 cannot be output. As a result, the engine 9 can be restarted quickly by operating the engine start switch 27 without further depleting the battery device 12, so that the operation can be performed smoothly, and in addition, the battery device It is possible to prevent 12 unnecessary wear.

  Furthermore, according to the above-described embodiment of the control device for the work machine of the present invention, even if the operator changes while the engine 9 is stopped for a long time by the auto-idling stop control, the restart is performed. Since the sequence is not executed, the engine 9 is not restarted even if the operator who has changed carelessly operates the operating bodies 4a and 4b. As a result, dangerous operations by the operator can be prevented.

  Note that some changes can be made to the configuration in the present embodiment. For example, the accumulator electromagnetic switching valve 17 is useful for preventing a transiently high pressure from being applied to the accumulator 18 by closing, but is not necessarily provided in the present invention.

1 Hydraulic Excavator 1A Front Device 1B Car Body 2 Main Control Unit (MCU)
3a Boom cylinder 3b Arm cylinder 3c Bucket cylinders 4a and 4b Operating devices 5a to 5f Control valve 6 Hydraulic pump 7 Pilot oil pump 8 Hydraulic oil tank 9 Engine 10 Electric motor 11 Chopper / inverter device 12 Battery device 13 Engine control unit (ECU)
14 Filter 15 Shuttle valve 16 Check valve 17 Accumulator electromagnetic switching valve 18 Accumulator 19 Pressure sensor 20 Gate lock electromagnetic switching valve 21 Pressure sensor 22 Gate lock lever 23 Cell motor 24 Cell motor control unit 25 Rotational speed command means 26 Monitor device 27 Engine start Switch 28 Idle stop switch

Claims (3)

An engine as a power source that is started by a cell motor based on the operation of an engine switch;
A hydraulic pump and a pilot oil pump driven by the engine;
A plurality of hydraulic actuators using the hydraulic pump as a drive source;
A plurality of operating bodies that command the operation of the plurality of hydraulic actuators;
A control valve for controlling the direction and flow rate of pressure oil supplied from the hydraulic pump to the plurality of hydraulic actuators;
A pilot oil passage for supplying pressure oil from the pilot oil pump to the operation portion of the control valve via the operation body;
In a control device for a work machine comprising engine control means capable of performing auto-idling stop control for automatically stopping the engine when a preset auto-idling stop condition is satisfied,
A pressure sensor that detects the pressure of the pilot oil passage that varies depending on the operation of the operating body;
An accumulator connected to the pilot oil passage and temporarily accumulating pressure oil discharged by the pilot oil pump;
Detecting means for detecting a pressure accumulation state of the accumulator; switching means for introducing pressure oil accumulated in the accumulator into the pilot oil passage between the pilot oil pump and the operating body;
Control means for receiving a command signal from the pressure sensor and a detection signal from the detection means, and outputting a restart command to the engine control means to restart the engine after the engine has been automatically stopped; ,
The control means is an idling stop elapsed time calculating means for calculating an elapsed time after the engine is stopped by the auto idling stop control,
In the idling stop elapsed time calculating means, when the engine restart command is not output after a predetermined time has elapsed, the engine restart command invalidating means for invalidating the engine restart command;
First monitor instruction means for outputting an engine restart instruction signal by operating the engine switch;
When the engine restart command is invalidated by the restart command invalidating means, a first monitoring means for displaying to the operator that the engine restart command is invalid and a restart instruction from the first monitor instructing means. A control device for a work machine, further comprising: The work machine control device according to claim 1 ,
The control means takes in the accumulated pressure state of the accumulator detected by the detection means, and determines whether or not restart is possible, and judges whether or not an engine restart command can be output;
And a second monitor instruction means for outputting an engine restart instruction signal by operating the engine switch when the restart possibility determination means determines that an engine restart command cannot be output . And
A control device for a work machine, further comprising second monitor means for displaying a result of determination by the restart possibility determination means and a restart instruction from the second monitor instruction means to an operator. The work machine control device according to claim 1 ,
An electric motor in which the engine and a drive shaft are mechanically coupled; an electric storage device that supplies electric energy to the electric motor; power conversion means that converts electric energy between the electric storage device and the electric motor; and the electric storage device. A power storage amount detecting means for detecting the stored power storage amount,
The control means takes in a power storage state detected by the power storage amount detection means, and determines whether or not an engine restart command can be output when the electric motor is started;
When the second restart possibility determining means determines that it is impossible to output an engine restart command by starting the electric motor, the engine switch is operated to output an engine restart instruction signal from the cell motor. And third monitor instruction means for
A control device for a work machine, further comprising third monitor means for displaying a result of determination by the second restart possibility determination means and a restart instruction from the third monitor instruction means to an operator.

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