JP4951650B2 - Hydraulic working machine - Google Patents

Description

  The present invention relates to a hydraulic working machine provided with engine stop control means for automatically stopping an engine in an idle state.

  There exists a thing shown by patent document 1 as this type of prior art. This prior art is a construction machine such as a hydraulic excavator, and includes an engine and a working device including a boom, an arm, and a bucket that can be operated in accordance with the driving of the engine. Further, a hydraulic actuator such as a boom cylinder and an arm cylinder for operating the work device, and an operating means for the hydraulic actuator are provided. Further, engine stop control means is provided for automatically stopping the engine when the engine is in an idle state in which the operation of the work device is stopped and the engine continues to drive. That is, when it is detected that the operating means is not operated and the operator is not in the driver's seat, engine stop control means for performing idle stop control for automatically stopping the engine after a preset time has elapsed. It has a configuration with.

JP 2002-13425 A

  In the above-described conventional technology, for example, even when the working device is held in the air, when the operation of the working device is stopped and the operator leaves the driver's seat, the engine stop control is performed after a preset time has elapsed. The engine is stopped by the means. However, in such a posture in which the work device is held in the air, the hydraulic actuator is operated by oil leaked from various valve bodies that control the hydraulic actuator, and the work device is lowered from a state where it is stopped in the air. There is a risk of starting. Since the engine is stopped at this time, when the obstacle is below the work device, the work device is lifted to avoid the obstacle, or the work device position is changed to avoid the obstacle. Also, it is impossible to perform an operation to avoid an obstacle by immediately grounding the working device.

  The present invention has been made from the above-described prior art, and its purpose is to automatically stop the engine when the engine is in an idle state, and the work device is stopped and held in the air. It is an object of the present invention to provide a hydraulic working machine that can prevent the engine from being stopped when.

  In order to achieve this object, a hydraulic working machine according to the present invention includes an engine, a working device operable according to driving of the engine, a hydraulic actuator for operating the working device, and an operating means for the hydraulic actuator. And an engine stop control means for automatically stopping the engine when the engine is in an idle state in which the operation of the work device is stopped and the engine is stopped. Idle detection means for detecting the idle state, idle determination means for determining the idle state based on the detection result of the idle detection means, and ground detection means for detecting that the working device is in the ground state , A ground determination means for determining the ground state based on a detection result of the ground detection means, and the idle determination And a control device that executes the engine stop process by the engine stop control means when it is determined that the engine is in the idle state at the stage and the ground contact determination means determines the ground state. .

  According to the present invention configured as described above, it is determined that the engine is in an idle state by the idle determination unit based on the detection result of the idle detection unit, and the work device by the ground determination unit based on the detection result of the ground detection unit is in the ground state. When both determinations are made, the control device executes engine stop processing by the engine stop control means. Therefore, when the engine is stopped, the work device is in a grounded state. That is, there is no concern that the engine will stop when the work device is stopped and held in the air. As a result, even if the work device that is stopped and held in the air starts to descend due to a leak, an operation for avoiding the work device can be immediately performed according to the drive of the engine.

  In the hydraulic work machine according to the present invention as set forth in the invention described above, the ground contact detection means comprises posture detection means for detecting a posture corresponding to the ground contact state of the work device.

  In the present invention configured as described above, when it is determined that the engine is in the idle state by the idle determination unit, and the ground determination unit determines that the engine is in the ground state based on the detection result of the posture detection unit. The control device executes an engine stop process by the engine stop control means.

  The hydraulic working machine according to the present invention is characterized in that, in the above invention, the ground contact detection means comprises pressure detection means for detecting a pressure in the hydraulic actuator corresponding to the ground contact state of the work device. .

  In the present invention configured as described above, when it is determined that the engine is in an idle state by the idle determination unit and the ground determination unit determines that the engine is in the ground state based on the detection result of the pressure detection unit. The control device executes an engine stop process by the engine stop control means.

  The present invention relates to an idle detection means for detecting that the engine is in an idle state in which the operation of the work device is stopped, and an idle determination means for determining an idle state based on a detection result of the idle detection means. A ground detecting means for detecting that the work device is in a ground state; a ground determining means for determining a ground state based on a detection result of the ground detecting means; an idle determining means for determining the ground state; When the determination means determines that it is in the grounded state, a control device that executes engine stop processing by the engine stop control means is provided, so that the working device is in the grounded state when the engine is stopped. . That is, the engine is automatically stopped when the engine is in an idle state, and there is no fear of causing the engine to stop when the work apparatus is stopped and held in the air. As a result, even if the work device that is stopped and held in the air starts to descend due to a leak, it is possible to immediately perform an operation to avoid it according to the drive of the engine, ensuring superior safety compared to the prior art. be able to.

1 is a side view of a hydraulic excavator showing an embodiment of a hydraulic working machine according to the present invention. It is a block diagram which shows the principal part structure with which the hydraulic shovel shown in FIG. 1 is equipped. It is a flowchart which shows the process implemented with the controller shown in FIG. It is a block diagram which shows the principal part structure of another embodiment of the hydraulic working machine which concerns on this invention.

  Embodiments of a hydraulic working machine according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view of a hydraulic excavator showing an embodiment of a hydraulic working machine according to the present invention, and FIG. 2 is a block diagram showing a main part configuration provided in the hydraulic excavator shown in FIG.

  The hydraulic working machine according to the present embodiment is, for example, the hydraulic excavator shown in FIG. 1, and the hydraulic excavator is attached to the traveling body 1, the swing body 2 disposed on the traveling body 1, and the swing body 2. The working device 3 is provided. The working device 3 includes a boom 4 that is attached to the swing body 2 so as to be rotatable in the vertical direction, an arm 5 that is attached to the tip of the boom 4, and a bucket 6 that is attached to the tip of the arm 5. . In addition, a hydraulic cylinder that operates the working device 3 such as a boom cylinder 4 a that operates the boom 4, an arm cylinder 5 a that operates the arm 5, and a bucket cylinder 6 a that operates the bucket 6 is provided.

  A driver's cab 7 is disposed at a front position on the revolving structure 2 and a counterweight 9 is disposed at a rear position to ensure a weight balance. Between the cab 7 and the counterweight 9, a machine room 8 in which equipment such as the engine 13 is accommodated is disposed. Further, as shown in FIG. 2, in the present embodiment, the flow of pressure oil supplied from the hydraulic pump 14 driven by the engine 13 and the hydraulic actuators such as the boom cylinder 4a and the arm cylinder 5a described above from the hydraulic pump 14 is shown. And a control valve 15 to be controlled.

  As shown in FIG. 2, the cab 7 is provided with operating means 17 for operating hydraulic actuators such as a boom cylinder 4a and an arm cylinder 5a for operating the work device 3. A gate lock lever 19 that is pulled down or pulled up is provided beside the driver's seat in the cab 7 as indicated by an arrow 19a. The gate lock lever 19 is pulled down at the start of work by the work device 3, whereby the work device 3 can be operated. That is, the hydraulic oil can be supplied from the hydraulic pump 14 to the hydraulic actuators such as the boom cylinder 4a and the arm cylinder 5a that operate the work device 3. In addition, when the user gets off the vehicle, the lifting operation is performed, so that the operation of the work device 3 is held in an impossible state. That is, the supply of pressure oil to the hydraulic actuators such as the boom cylinder 4a and the arm cylinder 5a for operating the work device 3 from the hydraulic pump 14 is held in an impossible state.

  In the hydraulic excavator according to the present embodiment, for example, when the work device 3 is stopped, the engine 13 is automatically controlled to a low idle state where normal work such as excavation work by the work device 3 is disabled, that is, a predetermined low rotation speed. It has come to be.

  In the present embodiment, a control device, that is, a controller 12 is provided in the cab 7. Further, in the present embodiment, the rotation sensor 16 that detects the rotation speed of the engine 13 and outputs it to the controller 12, the boom angle sensor 10 that detects the rotation angle of the boom 4 and outputs it to the controller 12, and the rotation of the arm 5 And an arm angle sensor 11 for detecting an angle and outputting it to the controller 12. The boom angle sensor 10 and the arm angle sensor 11 constitute posture detecting means for detecting the posture corresponding to the grounding state of the work device 3.

  Further, a non-operation detector 18 that detects that the operation means 17 is in a non-operation state and outputs a signal to the controller 12, and a gate lock detector 20 that detects that the gate lock lever 19 has been pulled up is provided. I have.

  The rotation sensor 16 that detects the rotation speed of the engine 13 described above is a state in which the rotation speed of the engine 13 is a predetermined low rotation speed at which the work device 3 cannot perform normal work, and the operation of the work device 3 is stopped. Thus, an idle detecting means for detecting that the engine 13 is in an idle state in which driving continues is configured. Each of the non-operation detector 18 that detects that the operation means 17 is in the non-operation state and the gate lock detector 20 that detects that the gate lock lever 19 has been pulled up also constitute idle detection means. ing.

  Further, as shown in FIG. 2, the controller 12 includes an engine stop control unit 12a that automatically stops the engine 13, an idle determination unit 12b that determines an idle state based on the detection result of the idle detection unit described above, A grounding determination unit 12c that includes a boom angle sensor 10 and an arm angle sensor 11 and determines a grounding state based on a detection result of a posture detection unit that detects that the working device 3 is in a posture corresponding to the grounding state. When the idle determination means 12b determines that the engine is in the idle state and the ground contact determination means 12c determines that the engine is in the ground state, the engine stop control means 12a performs stop control of the engine 13, that is, idle stop control. It is configured.

  FIG. 3 is a flowchart showing processing executed by the controller 12 shown in FIG. In the hydraulic excavator according to the present embodiment, the operator gets into the cab 7, drives the engine 13, pulls down the gate lock lever 19 on the side of the driver's seat, and the boom cylinder 4a and the arm cylinder 5a from the hydraulic pump 14. When the control means 15 is switched by operating the operating means 17 in a state in which the pressure oil can be supplied to the hydraulic actuator such as the pressure oil of the hydraulic pump 14 driven by the engine 13 via the control valve 15 It is supplied to the cylinder 4a, the arm cylinder 5a, etc., and the boom 4, the arm 5, etc. can be operated to carry out desired work such as excavation work by the bucket 6.

  During such work, for example, when the operation device 17 is returned to the neutral state in a state where the work device 3 is stopped and held in the air in order to temporarily suspend the work by the operation of the work device 3, the engine 13 is predetermined. Is detected by the rotation sensor 16 and is determined to be in the idle state by the idle determination means 12b included in the controller 12 (step S1 in FIG. 3), but the boom angle sensor 10 and the arm angle sensor 11 are determined. Is not determined by the ground determination means 12c included in the controller 12 to be in the ground state. Therefore, engine stop control is not executed.

  In order to perform warm-up operation at the start of work, for example, when the work device 3 is grounded, the engine speed of the engine 13 is set to the predetermined low speed by operating an engine speed indicator (not shown). When the rotational speed is increased to a higher rotational speed, the rotational speed detected by the rotational sensor 13 is higher than a predetermined low rotational speed. Therefore, the determination by the idle determination means 12b in the controller 12 is in the idle state. Therefore, the desired warm-up operation for warming the temperature of the hydraulic oil can be performed.

  Further, when the operation means 17 is returned to neutral while the work device 3 is grounded at the end of the work, in this hydraulic excavator, the rotational speed of the engine 13 is automatically reduced to be low idle. When the rotation sensor 16 detects that the engine 13 has reached a predetermined low speed, the idle determination means 12b of the controller 12 determines that the engine 13 is in an idle state (step S1 in FIG. 3). Based on the signal output from the angle sensor 11, the ground determination unit 12c of the controller 12 determines that the ground is in the ground state (step S2 in FIG. 3), and the controller 12 performs engine stop processing, that is, idle stop control by the engine stop control unit 12a. This is executed (step S3 in FIG. 3).

  After that, when the engine is started again and work is performed by the work device 3, a relatively high rotational speed corresponding to the operation of an engine speed indicator (not shown) is detected by the rotation sensor 16, and therefore the controller 12 The determination by the idle determination means 12b is not determined to be an idle state until the work device 3 is stopped. Therefore, a desired work by the work device 3 can be performed.

  In the hydraulic working machine according to the present embodiment configured as described above, the working device 3 is in a grounded state when the engine 13 is stopped, and there is no concern that the working device 3 is held in the air. As a result, even if the working device stopped and held in the air starts to descend due to a leak, an operation to avoid it can be immediately performed according to the driving of the engine 13, and excellent safety can be ensured.

  In the above embodiment, the idle determination means determines that the engine is in the idle state when the rotation speed of the engine 13 detected by the rotation sensor 16 reaches a predetermined low rotation speed. The idle determination unit 12b may determine that the operation unit 17 is in an idle state based on a signal from the non-operation detector 18 that detects that the operation unit 17 is in a non-operation state, and the gate lock lever 19 is lifted. It may be determined that the vehicle is in the idle state based on the signal from the gate lock detector 20 that has detected this. As described above, when the idle determination unit 12b determines that the engine is in the idle state based on the signal from the non-operation detector 18 or the signal from the gate lock detector 20, the stop control of the engine 13, that is, the idle stop control is performed. Thereafter, the engine is started again, and the engine 13 is rotated at a relatively high speed in response to an operation of an engine speed indicator (not shown), and the operation means 17 is operated or the gate lock lever 19 is pulled down. Then, until the operation means 17 is returned to the neutral position again or until the gate lock lever 19 is pulled up again, the determination of the idle determination means 12b in the controller 12 is not determined to be in the idle state. Therefore, a desired work by the work device 3 can be performed.

  Further, the idle determination means may determine the idle state based on three of the predetermined low speed of the engine 13, the non-operation state of the operation means 17, and the lifted state of the gate lock lever 19. Good.

  In the above-described embodiment, the posture detecting means for detecting the grounding posture of the work device 3 is configured by the boom angle sensor 10 and the arm angle sensor 11, but instead of these angle sensors, the boom cylinder 4a and the arm The posture detection means may be configured by a stroke sensor that detects the stroke of the cylinder 5a.

  FIG. 4 is a block diagram showing a main configuration of another embodiment of the hydraulic working machine according to the present invention. Another embodiment shown in FIG. 4 is also provided in the hydraulic excavator shown in FIG. 1, for example. This another embodiment is different from the ground detection means composed of the posture detection means constituted by the boom angle sensor 10 and the arm angle sensor 11 in the above-described embodiment, and the ground detection means is in the ground state of the work device 3. Pressure detecting means for detecting the supply pressure to the corresponding boom cylinder 4a and arm cylinder 5a, that is, pressure sensors 21 and 22, respectively. Other configurations are the same as those of the above-described embodiment.

  In another embodiment configured as described above, as in the above-described embodiment, the determination by the idle determination unit 12b of the controller 12 based on the detection result of the idle detection unit and the determination that the engine 13 is in the idle state and the ground determination unit When it is determined in 12c that the grounding state is established based on the signals of the pressure sensors 21 and 22, the controller 12 executes engine stop processing by the engine stop control means 12a. Thereby, the effect equivalent to embodiment mentioned above can be acquired.

  The ground contact detection means includes both the attitude detection means including the boom angle sensor 10 and the arm angle sensor 11 in the embodiment shown in FIG. 2 and the pressure sensors 21 and 22 in the embodiment shown in FIG. When the ground determination means 12c determines the ground state based on at least one of the signals from the boom angle sensor 10 and the arm angle sensor 11 and the signals from the pressure sensors 21 and 22, the ground determination state is set. It may be assumed that there is something. In such a configuration, for example, when the working device 3 is grounded on an inclined ground or the like, the ground determination means 12c does not determine the ground state from the signals from the boom angle sensor 10 and the arm angle sensor 11, but the pressure Since the ground state is determined based on the signals from the sensors 21 and 22, the work device 3 can be regarded as the ground state. Therefore, it is possible to execute idle stop control when the work device 3 is grounded on the slope.

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 3 Working device 4 Boom 4a Boom cylinder (hydraulic actuator)
5 Arm 5a Arm cylinder (hydraulic actuator)
10 Boom angle sensor (posture detection means) [contact detection means]
11 Arm angle sensor (posture detection means) [ground contact detection means]
12 Controller (control device)
12a Engine stop control means 12b Idle determination means 12c Ground contact determination means 13 Engine 14 Hydraulic pump 15 Control valve 16 Rotation sensor (idle detection means)
17 operation means 18 non-operation detector (idle detection means)
19 Gate lock lever 20 Gate lock detector (idle detection means)
21 Pressure sensor (pressure detection means) [ground detection means]
22 Pressure sensor (pressure detection means) [ground contact detection means]

Claims (3)

An engine, a working device operable according to the driving of the engine, a hydraulic actuator for operating the working device, an operating means for the hydraulic actuator, and the engine is driven in a state where the operation of the working device is stopped. In a hydraulic working machine comprising engine stop control means for automatically stopping the engine when in an idle state to continue,
Idle detection means for detecting that the engine is in the idle state; idle determination means for determining the idle state based on a detection result of the idle detection means;
A ground detection means for detecting that the working device is in a ground state; a ground determination means for determining the ground state based on a detection result of the ground detection means;
And a control device that executes the engine stop process by the engine stop control unit when the idle determination unit determines the idle state and the ground determination unit determines the ground state. A hydraulic working machine that features. In the hydraulic working machine according to claim 1,
The hydraulic working machine according to claim 1, wherein the ground contact detection means includes posture detection means for detecting a posture corresponding to the ground contact state of the work device. In the hydraulic working machine according to claim 1 or 2,
The hydraulic work machine according to claim 1, wherein the ground detection means comprises pressure detection means for detecting a pressure in the hydraulic actuator corresponding to the ground state of the working device.

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