KR20220047353A - construction machinery - Google Patents

Abstract

When the operation lever is not operated, power reduction control can be performed, and the return to the normal power state when the operation lever is moved by mistake is suppressed, and when the operation lever is returned to the normal power state, the To ensure smooth transition into action. For this reason, when in the power reduction state, when the first release condition in which two or more operation levers are laid down at the same time is satisfied, or when the second release condition in which one lever is continuously laid down, the controller 50 is , the operator determines that "there is an intention to cancel the power reduction", and cancels the power reduction control.

Description

construction machinery

The present invention relates to a construction machine such as a hydraulic excavator, and more particularly, to a construction machine that performs power reduction control for reducing power output from a power source when an operation lever is not operated.

Patent Document 1 describes, for example, a technique for performing power reduction control called auto idle control in which the engine rotation speed is reduced to reduce the power output from the engine when the operation lever is not operated in a construction machine. .

Moreover, as a theft prevention apparatus of a construction machine, the technique of performing authentication according to the input pattern of an operation lever is described in patent document 2 and patent document 3, for example.

Publication WO 2018/179313 Japanese Patent Laid-Open No. 11-140918 Japanese Patent Laid-Open No. 2018-016985

As described in Patent Document 1, in a construction machine that performs power reduction control (auto idle control) for reducing the power output from the engine, which is the power source, when the operation lever is not operated, the power reduction control is canceled when the operation lever is operated Therefore, it is common to be able to return to the normal power state. However, when the power reduction control is performed in this way, there is a problem that the control may be canceled even when there is no intention to cancel the power reduction control, such as when the operation lever is touched by mistake.

As a solution to this problem, it is conceivable to apply the authentication technique of the input pattern of an operation lever as described in patent documents 2 and 3. By applying such an authentication technique, it becomes possible to cancel the power reduction control and return to the normal power state only when there is an intention to cancel the power reduction control.

However, in the case of this method, there is a problem that, when returning to the normal power state, it cannot smoothly transition to the desired operation. For example, if the set recognition pattern is "Turn the right lever forward and the left lever forward" and the action to be performed is "Turn the right lever backward and the left lever right", once set After operating the operation lever in the operation pattern, it is necessary to return the operation lever to the neutral state. For this reason, the operator cannot smoothly shift to the operation|movement to be performed.

The present invention has been made based on the above object, and the object thereof is that power reduction control can be performed when the operation lever is not operated, and the return to the normal power state when the operation lever is moved by mistake is suppressed. and to provide a construction machine capable of smoothly transitioning to a desired operation when returning to a normal power state.

In order to solve the above problems, the present invention provides a power source, a plurality of actuators operated by receiving power output from the power source, and a plurality of operation levers for instructing the distribution amount of the power to the plurality of actuators; a plurality of operation state detection devices for detecting operation states of the plurality of operation levers, and a controller for controlling the power source, wherein the plurality of operation levers include first and second actuators for operating other actuators among the plurality of actuators; A construction machine having two operating levers, wherein the controller performs power reduction control for reducing the power when the non-operational state of the first and second operating levers continues, wherein the controller is configured to reduce the power It is assumed that the power reduction control is canceled when a first release condition in which the first and second operation levers are simultaneously operated in the current state is satisfied.

According to the present invention, the power reduction control can be canceled only by simultaneously operating the first and second operating levers in the power reduction state while performing the power reduction control when the first and second operation levers are not operated. In addition, when any one of the first and second operating levers is operated by mistake, the power reduction control is not canceled, and the return to the normal power state can be suppressed. In addition, since the power reduction control is canceled only by simultaneously operating the first and second operation levers in the power reduction state, it is possible to smoothly transition to the desired operation when returning to the normal power state.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the external appearance of the construction machine (hydraulic excavator) in 1st Embodiment of this invention.
2 is a diagram showing the configuration of the drive system in the first embodiment.
It is a figure explaining the definition of the movable direction of the operation lever of the operation lever apparatus in 1st Embodiment, and a movable direction.
Fig. 4 is a diagram showing the configuration of an operation signal system of the drive system according to the first embodiment.
Fig. 5 is a block diagram showing the function of the controller in the first embodiment.
6 is a block diagram showing the function of the power calculating unit in the first embodiment.
It is a flowchart which shows the calculation flow of the 1st lever operation state determination part in 1st Embodiment.
It is a flowchart which shows the calculation flow of the 2nd lever operation state determination part in 1st Embodiment.
It is a figure which shows the relationship between the sensor value and the meter opening area of a directional control valve in 1st Embodiment, and also shows the definition of the threshold value of an operating pressure.
It is a flowchart which shows the calculation flow of the 1st lever operation time measurement part in 1st Embodiment.
It is a flowchart which shows the calculation flow of the 2nd lever operation time measurement part in 1st Embodiment.
12 is a flowchart showing the calculation flow of the power reduction determination unit in the first embodiment.
It is a time chart which shows the transition example of the operating pressure and target rotation speed at the time of operating the lever in 1st Embodiment.
14 is a block diagram showing the function of the power calculating unit of the controller in a modified example of the first embodiment.
It is a flowchart which shows the calculation flow of the power reduction determination part in the modified example of 1st Embodiment.
16 is a diagram showing the configuration of the drive system in the second embodiment.
Fig. 17 is a block diagram showing the function of the controller in the second embodiment.
18 is a block diagram showing the function of the power calculating unit in the second embodiment.
It is a flowchart which shows the calculation flow of the power reduction determination part in 2nd Embodiment.
20 is a diagram showing a modified example of the drive system in the second embodiment.
21 is a diagram showing the configuration of the drive system in the third embodiment.
22 is a diagram showing the configuration of an operation signal system of the drive system according to the third embodiment.
It is a figure which shows the relationship of the inclination of the front-back direction of the lever, and the target rotation speed of an electric motor in 3rd Embodiment.
Fig. 24 is a block diagram showing the functions of the controller in the third embodiment.
Fig. 25 is a diagram for explaining the conversion processing performed by the sensor signal conversion unit in the third embodiment.
Fig. 26 is a block diagram showing the function of the power calculating unit in the third embodiment.
It is a flowchart which shows the calculation flow of the 1st lever operation state determination part in 3rd Embodiment.
It is a flowchart which shows the calculation flow of the 2nd lever operation state determination part in 3rd Embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

<First embodiment>

A first embodiment of the present invention will be described with reference to FIGS. 1 to 13 .

~configuration~

First, a hydraulic excavator as a representative example of the construction machine in the first embodiment of the present invention will be described.

1 : is a figure which shows the external appearance of the hydraulic excavator in this embodiment.

The hydraulic excavator includes a lower traveling body 101 , an upper revolving body 102 rotatably mounted on the lower traveling body, and a swing-type front work machine 104 installed in a front portion of the upper revolving body rotatably in the vertical direction. ), and the front working machine 104 includes a boom 111 , an arm 112 , and a bucket 113 . The upper swing 102 and the lower traveling body 101 are rotatably connected by a swing wheel 215 , and the upper swing body 102 is rotatably connected to the rotation of the swing motor 43 with respect to the lower traveling body 101 . can be turned by A swing post 103 is provided in the front part of the upper revolving body 102, and the front working machine 104 is installed in this swing post 103 so as to be movable up and down. The swing post 103 can rotate in the horizontal direction with respect to the upper revolving body 102 by expansion and contraction of a swing cylinder (not shown), and the boom 111 , the arm 112 , and the bucket of the front working machine 104 . Reference numeral 113 indicates that the boom cylinder 13, the arm cylinder 23, and the bucket cylinder 33, which are front actuators, can be rotated in the vertical direction by extension and contraction. The center frame of the lower traveling body 101 is provided with traveling devices 105a and 105b on the left and right, and blades 106 that move up and down by expansion and contraction of the blade cylinder 3h. The left and right traveling devices 105a and 105b are provided with driving wheels 210a and 210b, idlers 211a and 211b, and crawler belts 212a and 212b, respectively, respectively, and rotation of the left and right traveling motors 3f and 3g is driven by the driving wheels. It transmits to 210a, 210b, and it travels by driving the crawler belts 212a, 212b.

A cabin 110 having a cab 108 is installed in the upper revolving body 102 , and in the cab 108 , a driver's seat 122 , a boom cylinder 13 , an arm cylinder 23 , and a bucket cylinder 33 . ) and left and right operation lever devices 114 and 134 for instructing the driving of the turning motor 43 are provided.

Next, the drive system mounted on the construction machine (hydraulic excavator) of this embodiment is demonstrated. Fig. 2 is a diagram showing the configuration of the drive system according to the present embodiment.

In FIG. 2 , the drive system includes an engine 6 (diesel engine), a main hydraulic pump 1 and a pilot pump 51 , and the hydraulic pump 1 and the pilot pump 51 are the engine 6 . is driven by The hydraulic pump 1 is connected to a pipeline 2 , and a relief valve 3 is provided in the pipeline 2 through a relief pipeline 4 . The downstream side of the relief valve 3 is connected to the tank 5 . Downstream of the conduit 2, a tandem conduit 8 and a parallel conduit 9 are connected. Pipe lines 11 , 21 , 31 , 41 are connected in parallel to the parallel pipe line 9 . Check valves 10 , 20 , 30 , 40 are disposed in the pipelines 11 , 21 , 31 , and 41 , respectively.

A directional control valve 12 is connected downstream of the conduit 8 and the conduit 11 , and the directional control valve 12 is further connected to a bottom side chamber of the boom cylinder 13 , a bottom conduit 13B, boom It is connected to the rod pipe line 13R connected to the rod side chamber of the cylinder 13, the tank pipe line 13T connected to the tank 5, and the center bypass pipe line 13C.

The directional control valve 12 is driven by the pressure of the pilot line 12b and the pressure of the pilot line 12r. When the pressures in both pilot lines are low, the directional control valve 12 is in the neutral position, the conduit 8 is connected to the center bypass conduit 13C, and the other conduits are blocked. When the pressure of the pilot conduit 12b is high, the directional control valve 12 is switched to the upper side of the figure, and the conduit 11 is connected to the bottom conduit 13B and the tank conduit 13T is connected to the rod conduit 13R. and the conduit 8 and the center bypass conduit 13C are blocked. When the pressure in the pilot conduit 12r is high, the directional control valve 12 is switched to the lower side of the figure, and the conduit 11 is connected to the rod conduit 13R and the tank conduit 13T is connected to the bottom conduit 13B. and the conduit 8 and the center bypass conduit 13C are blocked.

A directional control valve 22 is connected downstream of the pipeline 13C and the pipeline 21 . The directional control valve 22 further includes a bottom conduit 23B connected to the bottom side chamber of the female cylinder 23 , a rod conduit 23R connected to the rod side chamber of the female cylinder 23 , and a tank 5 , It is connected to the connected tank pipe line 23T and the center bypass pipe line 23C.

The directional control valve 22 is driven by the pressure of the pilot pipe line 22b and the pressure of the pilot pipe line 22r. When the pressures in both pilot lines are low, the directional control valve 22 is in the neutral position, the center bypass line 13C is connected to the center bypass line 23C, and the other lines are blocked. When the pressure of the pilot conduit 22b is high, the directional control valve 22 is switched to the upper side of the figure, and the conduit 21 is connected to the bottom conduit 23B, and the tank conduit 23T is connected to the rod conduit 23R. and the center bypass pipe 13C and the center bypass pipe 23C are blocked. When the pressure in the pilot conduit 22r is high, the directional control valve 22 is switched to the lower side of the figure, and the conduit 21 is connected to the rod conduit 23R and the tank conduit 23T is connected to the bottom conduit 23B. and the center bypass pipe 13C and the center bypass pipe 23C are blocked.

A directional control valve 32 is connected downstream of the conduit 23C and the conduit 31 , and the directional control valve 32 is further connected to a bottom side chamber of the bucket cylinder 33 , a bottom conduit 33B, a bucket It is connected to the rod pipe line 33R connected to the rod side chamber of the cylinder 33, the tank pipe line 33T connected to the tank 5, and the center bypass pipe line 33C.

The directional control valve 32 is driven by the pressure of the pilot line 32b and the pressure of the pilot line 32r. When the pressures in both pilot lines are low, the directional control valve 32 is in the neutral position, the center bypass line 23C is connected to the center bypass line 33C, and the other lines are blocked. When the pressure of the pilot conduit 32b is high, the directional control valve 32 is switched upward in the figure, and the conduit 31 is connected to the bottom conduit 33B, and the tank conduit 33T is connected to the rod conduit 33R. and the center bypass pipe 23C and the center bypass pipe 33C are blocked. When the pressure in the pilot conduit 32r is high, the directional control valve 32 is switched downward in the figure, and the conduit 31 is connected to the rod conduit 33R, and the tank conduit 33T is connected to the bottom conduit 33B. and the center bypass pipe 23C and the center bypass pipe 33C are blocked.

A direction control valve 42 is connected downstream of the pipe line 33C and the pipe line 41 , and the direction control valve 42 further connects to the left rotation side chamber of the swing motor 43 . It is connected to the right turn pipe line 43R connected to the right side chamber of the motor 43, the tank pipe line 43T connected to the tank 5, and the center bypass pipe line 43C. The center bypass pipe line 43C is connected to the tank 5 .

The directional control valve 42 is driven by the pressure of the pilot line 42l and the pressure of the pilot line 42r. When the pressures in both pilot lines are low, the directional control valve 42 is in the neutral position, the center bypass line 33C is connected to the center bypass line 43C, and the other lines are blocked. When the pressure of the pilot conduit 42l is high, the directional control valve 42 is switched to the upper side of the figure, and the conduit 41 is connected to the left rotating conduit 43L and the tank conduit 43T is connected to the right rotating conduit 43R. and the center bypass pipe 33C and the center bypass pipe 43C are blocked. When the pressure of the pilot conduit 42r is high, the directional control valve 42 is switched to the lower side of the figure, and the conduit 41 is connected to the right turn conduit 43R and the tank conduit 43T is connected to the left turn conduit 43L. and the center bypass pipe 33C and the center bypass pipe 43C are blocked.

The pilot pump 51 is connected to the pilot pipe 52 . The downstream from the pilot conduit 52 will be described later with reference to FIG. 4 .

In addition, although not shown, the hydraulic drive system is provided with the same direction control valves for the traveling motors 3f and 3g, the blade cylinder 3h, and the swing cylinder (not shown) shown in Fig. 1, so that the connection and Blocking can be done.

Here, the engine 6 and the hydraulic pump 1 constitute a power source, and the boom cylinder 13 , the arm cylinder 23 , the bucket cylinder 33 , and the turning motor 43 receive power output from the power source. It composes a plurality of actuators that receive and actuate. The operation lever devices 114 and 134 each have left and right operation levers 14 and 34 (first and second operation levers) for instructing the distribution amount of power to a plurality of actuators, and the directional control valve 12, 22 , 32 , and 42 distribute power to a plurality of actuators based on instructions from the operation levers 14 , 34 .

Next, the structure of the operation signal system of a drive system is demonstrated using FIG.3 and FIG.4.

3 : is a figure explaining the definition of the movable direction of the operation lever of the operation lever devices 114 and 134 in 1st Embodiment, and a movable direction.

As described with reference to FIG. 1 , the left and right operation lever devices 114 and 134 are provided in the cab 108 of the hydraulic excavator, and the operator uses the right hand to operate the operation lever 14 of the operation lever device 114 (first operation lever), the operation lever 34 (second operation lever) of the operation lever device 134 is operated with the left hand. The operation lever devices 114 and 134 can operate two actuators with one operation lever 14 or 34, respectively. The operation levers 14 and 34 can be operated from a neutral position, respectively, and the operation of the forward direction 14b and the rear direction 14r of the operation lever 14 is an operation of boom lowering and boom raising of the boom cylinder 13 . Corresponding to, the operation of the right direction 24r and the left direction 24b of the operation lever 14 corresponds to the operation of the bucket dump of the bucket cylinder 33 and the bucket crowd, and the operation of the operation lever 34 in the right direction Operations in the 34b and left directions 34r correspond to the operations of the arm crowd and the arm dump of the arm cylinder 23, and the operations in the forward direction 44l and the rear direction 44r of the operation lever 34 are , corresponding to the right turning and left turning of the turning motor 43 . In addition, in this specification, the forward direction, the rear direction, the right direction, and the left direction mean the front direction, the rear direction, the right direction, and the left direction of the upper revolving body 102 which is a vehicle body.

In this way, the operating levers 14 and 34 of the operating lever devices 114 and 134 can be operated in multiple directions from the neutral position, and a plurality of actuators (boom cylinder 13, arm cylinder 23, bucket cylinder 33) , the other actuators among the turning motor 43) are operated.

4 is a diagram showing the configuration of an operation signal system of the drive system.

In FIG. 4 , the operating lever devices 114 and 134 are hydraulic pilot types, and the operating lever device 114 is a boom pilot valve 15b and 15r and a bucket pilot valve 25b driven by the operating lever 14 . , 25r), and the operation lever device 134 has pilot valves 35b and 35r for arms and pilot valves 45l and 45r for turning which are driven by the operation lever 34 . In the following description, the operation lever is sometimes simply referred to as a "lever".

Downstream of the pilot conduit 52 , conduits 19 , 29 , 39 , 49 and a relief valve 53 are connected in parallel. A tank 5 is connected downstream of the relief valve 53 . The conduits 19 , 29 , 39 , and 49 are provided with tightening portions 94 , 95 , 96 and 97 , respectively.

The pilot valve 15b of the operation lever device 114 is connected to the conduit 19 and is also connected to the conduit 18 and the conduit 16b. The conduit 16b is connected to the pilot conduit 12b (refer to FIG. 2). A pressure sensor 17b is provided on the conduit 16b. The pipeline 18 is connected to the tank 5 .

When the lever 14 is in the neutral position, the pilot valve 15b connects the conduit 18 and the conduit 16b, and shuts off the conduit 19 . When the lever 14 is operated in the forward direction 14b, the pilot valve 15b connects the conduit 19 and the conduit 16b, and shuts off the conduit 18. At this time, a pressure (operation pressure) according to the operation amount of the lever 14 is generated in the conduit 16b.

The pressure sensor 17b measures the pressure of the conduit 16b and transmits the signal to the electrically connected controller 50 .

The pilot valve 15r of the operation lever device 114 is connected to the conduit 19 and is also connected to the conduit 18 and the conduit 16r. The conduit 16r is connected to the pilot conduit 12r (refer to FIG. 2). A pressure sensor 17r is provided on the conduit 16r. The pipeline 18 is connected to the tank 5 .

When the lever 14 is in the neutral position, the pilot valve 15r connects the conduit 18 and the conduit 16r, and shuts off the conduit 19 . When the lever 14 is operated in the rear direction 14r, the pilot valve 15r connects the pipe line 19 and the pipe line 16r, and shuts off the pipe line 18. At this time, a pressure according to the operation amount of the lever 14 is generated in the conduit 16r.

The pressure sensor 17r measures the pressure of the pipeline 16r and transmits the signal to the electrically connected controller 50 .

The pilot valve 25b of the operation lever device 114 is connected to the conduit 29 and is also connected to the conduit 28 and the conduit 26b. The conduit 26b is connected to the pilot conduit 32b (refer to FIG. 2). A pressure sensor 27b is provided on the conduit 26b. The conduit 28 is connected to the tank 5 .

When the lever 14 is in the neutral position, the pilot valve 25b connects the conduit 28 and the conduit 26b, and shuts off the conduit 29 . When the lever 14 is operated in the left direction 24b, the pilot valve 25b connects the conduit 29 and the conduit 26b, and shuts off the conduit 28. At this time, a pressure (operation pressure) according to the operation amount of the lever 14 is generated in the conduit 26b.

The pressure sensor 27b measures the pressure of the conduit 26b and transmits the signal to the electrically connected controller 50 .

The pilot valve 25r of the operation lever device 114 is connected to the conduit 29 and is also connected to the conduit 28 and the conduit 26r. The conduit 26r is connected to the pilot conduit 32r (refer to FIG. 2). A pressure sensor 27r is provided on the conduit 26r. The conduit 28 is connected to the tank 5 .

When the lever 14 is in the neutral position, the pilot valve 25r connects the conduit 28 and the conduit 26r, and shuts off the conduit 29 . When the lever 14 is operated in the right direction 24r, the pilot valve 25r connects the pipe line 29 and the pipe line 26r, and shuts off the pipe line 28. At this time, a pressure (operation pressure) according to the operation amount of the lever 14 is generated in the conduit 26r.

The pressure sensor 27r measures the pressure of the pipe line 26r and transmits the signal to the electrically connected controller 50 .

The pilot valve 35b of the operation lever device 134 is connected to the conduit 39 and is also connected to the conduit 38 and the conduit 36b. The conduit 36b is connected to the pilot conduit 22b (refer to FIG. 2). A pressure sensor 37b is provided on the conduit 36b. The conduit 38 is connected to the tank 5 .

When the lever 34 is in the neutral position, the pilot valve 35b connects the conduit 38 and the conduit 36b, and shuts off the conduit 39 . When the lever 34 is operated in the right direction 34b, the pilot valve 35b connects the conduit 39 and the conduit 36b and shuts off the conduit 38 . At this time, a pressure (operation pressure) according to the amount of operation of the lever 34 is generated in the conduit 36b.

The pressure sensor 37b measures the pressure of the conduit 36b and transmits the signal to the electrically connected controller 50 .

The pilot valve 35r of the operation lever device 134 is connected to the conduit 39 and is also connected to the conduit 38 and the conduit 36r. The pipe line 36r is connected to the pilot pipe line 22r (refer FIG. 2). A pressure sensor 37r is provided on the pipe line 36r. The conduit 38 is connected to the tank 5 .

When the lever 34 is in the neutral position, the pilot valve 35r connects the conduit 38 and the conduit 36r, and shuts off the conduit 39 . When the lever 34 is operated in the left direction 34r, the pilot valve 35r connects the conduit 39 and the conduit 36r, and shuts off the conduit 38 . At this time, a pressure (operation pressure) according to the operation amount of the lever 34 is generated in the conduit 36r.

The pressure sensor 37r measures the pressure of the pipe line 36r and transmits the signal to the electrically connected controller 50 .

The pilot valve 45l of the operation lever device 134 is connected to the conduit 49 and is also connected to the conduit 48 and the conduit 46l. The conduit 46l is connected to the pilot conduit 42l (refer to Fig. 2). A pressure sensor 47l is provided on the conduit 46l. The conduit 48 is connected to the tank 5 .

When the lever 34 is in the neutral position, the pilot valve 45l connects the conduit 48 and the conduit 46l, and shuts off the conduit 49 . When the lever 34 is operated in the forward direction 44l, the pilot valve 45l connects the conduit 49 and the conduit 46l, and shuts off the conduit 48. At this time, a pressure (operation pressure) according to the operation amount of the lever 34 is generated in the conduit 46l.

The pressure sensor 47l measures the pressure in the conduit 46l and transmits the signal to the electrically connected controller 50 .

The pilot valve 45r of the operation lever device 134 is connected to the conduit 49 and is also connected to the conduit 48 and the conduit 46r. The conduit 46r is connected to the pilot conduit 42r (refer to Fig. 2). A pressure sensor 47r is provided on the pipe line 46r. The conduit 48 is connected to the tank 5 .

When the lever 34 is in the neutral position, the pilot valve 45r connects the conduit 48 and the conduit 46r, and shuts off the conduit 49 . When the lever 34 is operated in the rear direction 44r, the pilot valve 45r connects the conduit 49 and the conduit 46r, and shuts off the conduit 48 . At this time, a pressure (operation pressure) according to the operation amount of the lever 34 is generated in the conduit 46r.

The pressure sensor 47r measures the pressure of the pipe line 46r and transmits the signal to the electrically connected controller 50 .

The pressure sensors 17b, 17r, 27b, 27r, 37b, 37r, 47l, and 47r constitute a plurality of operation state detection devices that detect the operation states of the operation lever devices 114 and 134 . Moreover, the pressure sensors 17b and 17r constitute a 1st operation state detection device which detects the operation state of the front-back direction of the operation lever 14, and the pressure sensors 27b, 27r of the operation lever 14 A second operation state detection device for detecting an operation state in a right-left direction is constituted, and the pressure sensors 37b and 37r constitute a third operation state detection device for detecting an operation state in a right-left direction of the operation lever 34, , the pressure sensors 47l and 47r constitute a fourth operation state detection device that detects the operation state of the operation lever 34 in the front-rear direction.

In addition, although not shown, the operation signal system is equipped with the operation lever apparatus similar to the traveling motors 3f and 3g shown in FIG. 1, the blade cylinder 3h, and the swing cylinder not shown in figure. This embodiment may provide an operation state detection device also for such an operation lever device, and may perform the power reduction control mentioned later based on the operation state.

Returning to FIG. 2 , the drive system of the present embodiment further includes a controller 50 and a switch 76 .

The controller 50 is electrically connected to the pressure sensors 17b , 17r , 27b , 27r , 37b , 37r , 47l , and 47r , a switch 76 , and a target rotation speed indicating device 77 . The controller 50 receives a signal of each measured pressure from the pressure sensors 17b to 47r, a signal from the switch 76, and a signal from the target rotation speed indicating device 77, and based on those signals Thus, the target rotation speed of the engine 6 is calculated, and a command signal, which is a command value of the power, is transmitted to the engine speed control device 7 electrically connected to the controller 50 . The rotation speed control device 7 controls the engine 6 so that it becomes the target rotation speed.

The switch 76 is a switch for switching whether to set the power reduction control mode by sending an ON or OFF signal to the controller 50, and when the signal of the switch 76 is OFF, the power reduction control mode is canceled Thus, the driving power of the engine 6 is not reduced even when all the operation levers are in a non-operational state.

Next, the function of the controller 50 in the first embodiment will be described. 5 is a block diagram showing the function of the controller 50 .

In FIG. 5, the controller 50 has each function of the sensor signal conversion part 50a, the constant/table storage part 50b, and the power calculation part 50c.

The sensor signal conversion unit 50a receives signals transmitted from the pressure sensors 17b to 47r and the switch 76, and converts them into pressure information and switch flag information. The sensor signal converting unit 50a transmits the converted pressure information and switch flag information to the power calculating unit 50c. In addition, the pressure information converted by the sensor signal conversion unit 50a is converted to the sensor values P17b(t), P17r(t), P27b(t), P27r(t), P37b(t), P37r(t), P47l( t), P47r(t)), and the switch information converted by the sensor signal conversion unit 50a is indicated by the switch flag Fsw(t). The pressure information converted by the sensor signal conversion unit 50a is the pressure generated in the pipelines 16b to 46r when the pilot valves 15b to 45r are driven, and the sensor values P17b(t), P17r(t), P27b (t), P27r(t), P37b(t), P37r(t), P47l(t), P47r(t)) are sometimes referred to as "operation pressure". It is assumed that Fsw(t) = true (valid) when the switch 76 is ON, and Fsw(t) = false (invalid) when the switch 76 is OFF.

The constant/table storage unit 50b stores constants and tables necessary for calculation, and transmits such information to the power calculating unit 50c.

The power calculation unit 50c includes pressure information and switch flag information transmitted from the sensor signal conversion unit 50a, target rotation speed information transmitted from the target rotation speed indicating device 77, and a constant/table storage unit 50b. By receiving constant information or table information transmitted from , the target rotation speed of the engine 6 is calculated. And the power calculating part 50c outputs the target rotation speed to the rotation speed control device 7 .

Next, the function of the power calculating part 50c in 1st Embodiment is demonstrated. 6 is a block diagram showing the function of the power calculating unit 50c. In addition, it is assumed that the sampling time of the controller 50 is Δt.

In Fig. 6 , the power calculation unit 50c includes a first lever operation state determination unit 50c-1, a second lever operation state determination unit 50c-2, a first lever operation time measurement unit 50c-3, and a second 2 It has each function of the lever operation time measuring part 50c-4, the power reduction determination part 50c-5, and the delay element 50c-6.

The first lever operation state determination unit 50c-1 determines whether the lever 14 is operated from the sensor values P17b(t), P17r(t), P27b(t), and P27r(t), , the first lever no operation flag F14(t) is output. When the first lever operation state determination unit 50c-1 determines that the lever 14 is not operated, the first lever no operation flag F14(t) is set to true, and when it determines that the lever 14 is operated, Each of the first lever no operation flags F14(t) is set to false. This flag information is transmitted to the 1st lever operation time measurement part 50c-3 and the power reduction determination part 50c-5.

The second lever operation state determination unit 50c-2 determines whether the lever 34 has been operated from the sensor values P37b(t), P37r(t), P47l(t), and P47r(t), , the second lever no operation flag F34(t) is output. When the second lever operation state determination unit 50c-2 determines that the lever 34 is not operated, the second lever no operation flag F34(t) is set to true, and when it determines that the lever 34 is operated, Each of the second lever no operation flags F34(t) is set to false. This flag information is transmitted to the second lever operation time measurement unit 50c-4 and the power reduction determination unit 50c-5.

The first lever operation time measurement unit 50c-3 measures the first lever operation time Tu14(t) and the first lever operation time Tc14(t). This time information is transmitted to the power reduction determination unit 50c-5.

The second lever operation time measurement unit 50c-4 measures the second lever non-operation time Tu34(t) and the second lever operation time Tc34(t). This time information is transmitted to the power reduction determination unit 50c-5.

The power reduction determination unit 50c-5 includes flag information F14(t), F34(t) and time information Tu14(t), Tc14(t), Tu34(t), Tc34(t); Based on the power reduction flag F50(t-Δt) and the switch flag Fsw(t) generated by the delay element 50c-6 one step before, it is determined whether or not to reduce the target rotation speed, and the The target rotation speed and the power reduction flag F50(t) are output from the determination result and the target rotation speed of the target rotation speed instruction|indication device 77. The power reduction determination unit 50c-5 sets the power reduction flag F50(t) to true when determining that the target rotation speed is to be reduced, and when determining that the target rotation speed is not reduced, the power reduction flag F50(t) )) is set to false.

Next, the function of the 1st lever operation state determination part 50c-1 in 1st Embodiment is demonstrated. FIG. 7 is a flowchart showing the calculation flow of the first lever operation state determination unit 50c-1 of FIG. 6 . This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

In step S101, the calculation of the first lever operation state determination unit 50c-1 is started.

In step S102, the first lever operation state determination unit 50c-1 determines whether the sensor value P17b(t) is equal to or less than a threshold Pth. When the sensor value P17b(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the process proceeds to step S103. When the sensor value P17b(t) is larger than the threshold value Pth, it determines with "No", and it progresses to the process of step S107.

In step S103, the first lever operation state determination unit 50c-1 determines whether the sensor value P17r(t) is equal to or less than a threshold value Pth. When the sensor value P17r(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S104. When the sensor value P17r(t) is larger than the threshold value Pth, it determines with "NO", and it progresses to the process of step S107.

In step S104, the first lever operation state determination unit 50c-1 determines whether the sensor value P27b(t) is equal to or less than a threshold value Pth. When the sensor value P27b(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S105. When the sensor value P27b(t) is larger than the threshold value Pth, it determines with "No", and it progresses to the process of step S107.

In step S105, the first lever operation state determination unit 50c-1 determines whether the sensor value P27r(t) is equal to or less than a threshold value Pth. When the sensor value P27r(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S106. When the sensor value P27r(t) is larger than the threshold value Pth, it determines with "No", and it progresses to the process of step S107.

In step S106, the first lever operation state determination unit 50c-1 determines that the lever 14 is not operated, and sets the first lever no operation flag F14(t) to true. And the flag information is transmitted to the 1st lever operation time measurement part 50c-3 and the power reduction determination part 50c-5.

In step S107, the first lever operation state determination unit 50c-1 determines that the lever 14 has been operated, and sets the first lever no operation flag F14(t) to false. And the flag information is transmitted to the 1st lever operation time measurement part 50c-3 and the power reduction determination part 50c-5.

Next, the function of the 2nd lever operation state determination part 50c-2 in 1st Embodiment is demonstrated. Fig. 8 is a flowchart showing the calculation flow of the second lever operation state determination unit 50c-2 of Fig. 6 . This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

In step S201, the calculation of the second lever operation state determination unit 50c-2 is started.

In step S202, the second lever operation state determination unit 50c-2 determines whether the sensor value P37b(t) is equal to or less than a threshold Pth. When the sensor value P37b(t) is equal to or less than the threshold value Pth, it is determined as "Yes", and the processing proceeds to step S203. When the sensor value P37b(t) is larger than the threshold value Pth, it determines with "No", and it progresses to the process of step S207.

In step S203, the second lever operation state determination unit 50c-2 determines whether the sensor value P37r(t) is equal to or less than a threshold value Pth. When the sensor value P37r(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S204. When the sensor value P37r(t) is larger than the threshold value Pth, it is determined as "No", and the process proceeds to step S207.

In step S204, the second lever operation state determination unit 50c-2 determines whether the sensor value P471(t) is equal to or less than a threshold value Pth. When the sensor value P471(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S205. When the sensor value P471(t) is larger than the threshold value Pth, it is determined as "No", and the process proceeds to step S207.

In step S205, the second lever operation state determination unit 50c-2 determines whether the sensor value P47r(t) is equal to or less than a threshold value Pth. When the sensor value P47r(t) is equal to or less than the threshold value Pth, it is determined as "YES", and the processing proceeds to step S206. When the sensor value P47r(t) is larger than the threshold value Pth, it determines with "No", and it progresses to the process of step S207.

In step S206, the second lever operation state determination unit 50c-2 determines that the lever 34 is not operated, and sets the second lever no operation flag F34(t) to true. And the flag information is transmitted to the 2nd lever operation time measurement part 50c-4 and the power reduction determination part 50c-5.

In step S207, the second lever operation state determination unit 50c-2 determines that the lever 14 has been operated, and sets the second lever no operation flag F34(t) to false. And the flag information is transmitted to the 2nd lever operation time measurement part 50c-4 and the power reduction determination part 50c-5.

The definition of the threshold value Pth of the sensor value mentioned above is demonstrated using FIG. 9 shows the relationship between the sensor value P17b(t) or P17r(t) and the metric opening area of the directional control valve 12 . In addition, the sensor value P17b(t) or P17r(t) is described as "operation pressure".

In Fig. 9, since the meter-in opening is not opened until the operating pressure P17b(t) or P17r(t) becomes the value of Pth, the hydraulic cylinder (boom cylinder) 13 does not operate. This relationship is the same for other directional control valves. The operation state determination units 50c-1 and 50c-2 use the pressure value Pth at which the meter-in opening is opened as the threshold value.

Next, the function of the 1st lever operation time measuring part 50c-3 in 1st Embodiment is demonstrated. 10 : is a flowchart which shows the calculation flow of the 1st lever operation time measurement part 50c-3 of FIG. This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

Calculation of the 1st lever operation time measuring part 50c-3 is started in step S301.

In step S302, the 1st lever operation time measurement part 50c-3 determines whether the 1st lever no operation flag F14(t) is true. When the first lever no operation flag F14(t) is true, it is determined as "YES", and the processing proceeds to step S303. When the first lever no operation flag F14(t) is false, it is determined as "NO", and the processing proceeds to step S304.

In step S303, since the lever 14 is not operated, the first lever operation time measuring unit 50c-3 sets the sampling time Δt to the first lever non-operation time Tu14(t-Δt) one step before. A value obtained by adding ? is set as a new first lever non-operation time Tu14(t). Further, the first lever operation time Tc14(t) is set to zero. Then, the information is transmitted to the power reduction determination unit 50c-5.

In step S304, since the lever 14 has been operated, the first lever operation time measurement unit 50c-3 sets the first lever non-operation time Tu14(t) to zero. Further, a value obtained by adding the sampling time Δt to the first lever operation time Tc14 (t-Δt) before one step is set as the new first lever operation time Tc14(t). Then, the information is transmitted to the power reduction determination unit 50c-5.

Next, the function of the 2nd lever operation time measuring part 50c-4 in 1st Embodiment is demonstrated. 11 : is a flowchart which shows the calculation flow of the 2nd lever operation time measurement part 50c-4 of FIG. This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

Calculation of the 2nd lever operation time measuring part 50c-4 is started in step S401.

In step S402, the 2nd lever operation time measurement part 50c-4 determines whether the 2nd lever no operation flag F34(t) is true. When the second lever no operation flag F34(t) is true, it is determined as "YES", and the processing proceeds to step S403. When the second lever no operation flag F34(t) is false, it is determined as "NO", and the processing proceeds to step S404.

In step S403, since the lever 34 is not operated, the second lever operation time measuring unit 50c-4 sets the sampling time Δt to the second lever non-operation time Tu34(t-Δt) one step before. A value obtained by adding ? is set as a new second lever no-operation time Tu34(t). Further, the second lever operation time Tc34(t) is set to zero. Then, the information is transmitted to the power reduction determination unit 50c-5.

In step S404, since the lever 34 has been operated, the second lever operation time measurement unit 50c-4 sets the second lever non-operation time Tu34(t) to zero. Further, the value obtained by adding the sampling time Δt to the second lever operation time Tc34(t-Δt) before one step is set as the new second lever operation time Tc34(t). Then, the information is transmitted to the power reduction determination unit 50c-5.

Next, the function of the power reduction determination unit 50c-5 in the first embodiment will be described. 12 is a flowchart showing a calculation flow of the power reduction determination unit 50c-5 of FIG. 6 . This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

In step S501, the calculation of the power reduction determination unit 50c-5 is started.

In step S502, the power reduction determination unit 50c-5 determines whether the switch flag Fsw(t) is true. When the switch flag Fsw(t) is true, it is determined as "YES", and the process proceeds to step S503. When the switch flag Fsw(t) is false, it is determined as "NO", and the processing proceeds to step S515.

In step S503, the power reduction determination unit 50c-5 determines that the smaller value of the first lever no operation time Tu14(t) and the second lever no operation time Tu34(t) is the power reduction control It is determined whether it is equal to or longer than a first predetermined time Tth1 set in advance as a time for starting . If the smaller value of the first lever no operation time Tu14(t) and the second lever no operation time Tu34(t) is equal to or longer than the first predetermined time Tth1, it is determined as “Yes”, and in step S510 proceed with the processing of If the smaller value of the first lever no operation time Tu14(t) and the second lever no operation time Tu34(t) is less than the first predetermined time Tth1, it is determined as “No”, and the step The process proceeds to S504. The first predetermined time Tth1 is, for example, 10 to 15 seconds. As a result, if neither of the levers 14 and 34 is operated and the non-operation times Tu14(t), Tu34(t) are equal to or longer than the first predetermined time Tth1, the determination is "Yes" ', and power reduction control is performed in step S510 (to be described later). In addition, when at least one of the levers 14 and 34 is operated and the operated lever is returned to the neutral position in a state in which power reduction control is not performed, the non-operation time Tu14(t) and/or Tu34 Since (t)) becomes 0, the determination becomes "NO", and the process proceeds to step S504. In addition, when at least one of the levers 14 and 34 is operated in the state of power reduction control, since the no-operation time Tu14(t) and/or Tu34(t) becomes 0, the determination is " No", and the process proceeds to step S504.

In step S504, the power reduction determination unit 50c-5 determines whether the power reduction flag F50(t-Δt) before one step is true. When the power reduction flag F50(t-Δt) is true (when power reduction control is being carried out so far), it is determined as "YES", and the process proceeds to step S505. When the power reduction flag F50(t-Δt) is false (when the power reduction control has been canceled so far), it is determined as "No", the process proceeds to step S515, and the cancellation of the power reduction control is continued. (described later).

In step S505, the power reduction determination unit 50c-5 determines whether the first lever no operation flag F14(t) is true. When the first lever no-operation flag F14(t) is true (when the lever 14 has not been operated), it is determined as YES, and the processing proceeds to step S506. When the first lever no operation flag F14(t) is false (when the lever 14 has been operated), it is determined as "NO", and the process proceeds to step S508.

In step S506, the power reduction determination unit 50c-5 determines whether the second lever no operation flag F34(t) is true. When the second lever no operation flag F34(t) is true (when the lever 34 is not operated), it is determined as "YES", and the process proceeds to step S510 to perform power reduction control (described later). ). When the second lever no operation flag F34(t) is false (when the lever 34 is operated), it is determined as "NO", and the processing proceeds to step S507.

In step S507, the power reduction determination unit 50c-5 determines that the second lever operation time Tc34(t) is longer than the second predetermined time Tth2 preset as a time period that can be considered to have been operated by the operator's intention. Determine if it is large When Tc34(t) is greater than the second predetermined time Tth2 (when the operation time of the lever 34 exceeds Tth2), it is determined as YES in step S507, the process proceeds to step S511, and the power is reduced Release the control (to be described later). When Tc34(t) is equal to or less than the second predetermined time Tth2 (when the operation time of the lever 34 is less than Tth2), it is determined as NO in step S507, and the process proceeds to the processing of step S512 to continue the power reduction control. do. The second predetermined time Tth2 is shorter than the first predetermined time Tth1, for example, 2 to 3 seconds.

In step S508, the power reduction determination unit 50c-5 determines whether the second lever no operation flag F34(t) is true. When the second lever no operation flag F34(t) is true (when the lever 34 is not operated), it is determined as "YES", and the processing proceeds to step S509. When the second lever no operation flag F34(t) is false (when the lever 34 is operated), it is determined as "No", the process proceeds to step S515, and the power reduction control is canceled (described later). ).

Here, when it is determined with "No" in step S508, it is determined with "No" in both steps S505 and S508, and the first and second operation levers 14 and 34 are simultaneously operated in a state in which the power is reduced. This is a case in which the first cancellation condition to be performed is satisfied. In the present embodiment, when the first release condition in which the first and second operation levers 14 and 34 are simultaneously operated in this way is satisfied, the power reduction control is canceled.

In step S509, the power reduction determination unit 50c-5 determines whether the first lever operation time Tc14(t) is greater than the second predetermined time Tth2. When the first lever operation time Tc14(t) is greater than the second predetermined time Tth2 (when the operation time of the lever 14 exceeds Tth2), it is determined as “Yes”, and the processing of step S513 proceeds. Proceed to cancel the power reduction control (described later). When the first lever operation time Tc14(t) is less than or equal to the second predetermined time Tth2 (when the operation time of the lever 14 is less than Tth2), it is determined as “No”, and the process proceeds to step S514 for power Continue the abatement control.

Here, when it is determined as "No" in step S506 and "Yes" in step S507, and when it is determined as "No" in step S508 and "Yes" in step S509, the power is In the reduced state, one of the first and second operating levers 14 and 34 is operated, and the second release condition in which the operating state of the one operating lever continues for a second predetermined time Tth2 is satisfied. is the case In this embodiment, even when the said 1st cancellation condition is not satisfied, one operation lever of the 1st and 2nd operation levers 14 and 34 is operated, and the operation state of the one operation lever is set to a second predetermined condition. When the second cancellation condition lasting for the time Tth2 is satisfied, the power reduction control is canceled.

In step S510 , the power reduction determination unit 50c - 5 sets the power reduction flag F50(t) to true and sets the target rotation speed of the engine 6 to the target rotation speed indicating device 77 . It is reduced than the normal target rotation speed indicated by And the target rotation speed information is transmitted to the rotation speed control device 7 . The rotation speed control device 7 reduces the rotation speed of the engine 6 by reducing the amount of fuel supplied to the engine 6 . In steps S512 and S514, the same processing as in step S510 is performed. In this way, the power reduction determination unit 50c-5 performs power reduction control in steps S510, S512, and S514.

In step S511, the power reduction determination unit 50c-5 sets the power reduction flag F50(t) to false and sets the target engine speed of the engine 6 to the target engine speed indicating device 77 . The normal value indicated by And the target rotation speed information is transmitted to the rotation speed control device 7 . The rotation speed control device 7 increases the rotation speed of the engine 6 by increasing the amount of fuel supplied to the engine 6 . In steps S513 and S515, the same processing as in step S511 is performed. In this way, the power reduction determination unit 50c-5 cancels the power reduction control in steps S511 and S513. Moreover, in step S515, when power reduction control has not been performed so far, the cancellation|release of power reduction control is continued, and when power reduction control has been performed so far, power reduction control is cancelled.

Next, an example of transition between the operating pressure and the target rotation speed in the first embodiment will be described with reference to FIG. 13 . 13 is a time chart showing an example of transition between the operating pressure and the target rotation speed when the levers 14 and 34 are operated. The upper graph of FIG. 13 shows the time change of the operating pressure P17b(t) by the lever 14, the central graph shows the time change of the operating pressure P37b(t) by the lever 34, and the lower graph represents the time change of the target rotation speed, respectively. All graphs on the horizontal axis are time (seconds). Moreover, the threshold value Pth of an operating pressure is also described in the upper graph and the graph at the center.

At time t0, the lever 14 is operated in the forward direction 14b and the lever 34 is operated in the right direction 34b, respectively. Therefore, both the pressure values of the operating pressure P17b(t) and the operating pressure P37b(t) exceed the threshold value Pth, and the pressure values of the other operating pressures not shown in figure are zero. At this time, the process of step S515 in FIG. 12 is performed (S502→S503→S504→S515), and the target speed becomes the normal value Nh indicated by the target speed indicating device 77 . That is, the power reduction control (auto idle control) is canceled.

From time t0 to time t1, both of the operating pressures P17b(t) and P37b(t) are larger than the threshold value Pth. Also at this time, the process of step S515 in FIG. 12 is performed (S502→S503→S504→S515), and the target rotation speed is the normal value Nh.

At the time t1, the levers 14 and 34 are returned to the neutral position, and both the operating pressures P17b(t) and P37b(t) are smaller than the threshold value Pth. Therefore, from time t1 to after the first predetermined time (Tth1 second), the process of step S515 is performed, and thereafter, the process of step S510 of FIG. 12 is performed (S502→S503→S510), and the target rotation speed is the normal It is reduced from the value Nh and set to a small value Nl of the power reduction control (auto idle control).

At time t2, the lever 34 is operated, and only the operating pressure P37b(t) becomes larger than the threshold value Pth. At this time, the process of step S512 in FIG. 12 is performed (S502→S503→S504→S505→S506→S507→S512), and power reduction control is continued. If this state continues for more than the second predetermined time (Tth2 seconds) and the second cancellation condition described above is satisfied, the processing of step S511 in Fig. 12 is performed (S502 → S503 → S504 → S505 → S506 → S507 → S511), The target rotation speed is set to the normal value Nh, and the power reduction control is canceled.

In addition, if the operation of the lever 34 at this time is an erroneous operation and the lever 34 is returned to the neutral position before reaching the second predetermined time (Tth2 seconds), the non-operation time Tu34(t) is becomes 0. At this time, the determination in step S503 in Fig. 12 remains "NO", and the determination in step S506 becomes "YES". For this reason, the process of step S510 is performed (S502→S503→S504→S505→S506→S510), and power reduction control is continued.

After that, the operating pressure P37b(t) is lowered again at time t2a, and both the operating pressures P17b(t) and P37b(t) are set to a value smaller than the threshold Pth. When this state continues for more than the first predetermined time (Tth1 second), the processing of step S510 in Fig. 12 is performed (S502 → S503 → S510), and the target rotation speed is set to the small value Nl of the power reduction control. And the operating pressures P17b(t) and P37b(t) are simultaneously larger than the threshold value Pth at time t3. At this time, the above-described first cancellation condition is satisfied, the processing of step S515 in Fig. 12 is performed (S502→S503→S504→S505→S508→S515), and the target rotation speed is reset to the normal value Nh without delay. , the power reduction control is canceled.

As described above, according to this embodiment, in the controller 50 , in the power reduction state of the engine 6 and the hydraulic pump 1 , the two operation levers 14 and 34 of the operation lever devices 114 and 134 respectively When the simultaneously operated first release condition is satisfied (S502→S503→S504→S505→S508→S515 in FIG. 12 ), the controller 50 determines that the operator “intentions to cancel the power reduction” , cancel the power reduction control. Thereby, power reduction control can be canceled simply by simultaneously operating the two operation levers 14 and 34 in the power reduction state while performing power reduction control when the two operation levers 14 and 34 are not operated. . In addition, since the power reduction control is canceled only by simultaneously operating the two operation levers 14 and 34 in the power reduction state, it is possible to smoothly transition to the desired operation when returning to the normal power state. .

On the other hand, when one operation lever is operated, the power reduction control is canceled when the second release condition in which one operation lever is operated for a time longer than the second predetermined time Tth2 is satisfied (S502→S503→S504) →S505→S506→S507→S511, or S502→S503→S504→S505→S508→S509→S513). As a result, if any one of the operating levers is erroneously operated for a short period of time (time less than the second predetermined time Tth2), the power reduction control is not canceled, and the return to the normal power control state can be avoided. . Further, since the power reduction control is canceled only by continuously operating one operation lever for the second predetermined time Tth2 or longer, it is possible to smoothly transition to the desired operation when returning to the normal power state. .

<Modification 1>

In the first embodiment, as described above, in the controller 50, the two operation levers 14 and 34 of each of the operation lever devices 114 and 134 in the power reduction state of the engine 6 and the hydraulic pump 1 are It was comprised so that the power reduction control might be cancelled|released in the case where it was operated simultaneously, and when one operation lever was continuously operated more than the 2nd predetermined time Tth2. However, only when the two operating levers 14 and 34 of each of the operating lever devices 114 and 134 are simultaneously operated in either one of, for example, the reduced power state of the engine 6 and the hydraulic pump 1 . The controller 50 may be configured to cancel the power reduction control. Also in this case, as described above, when the operation lever is not operated, power reduction control can be performed, and the return to the normal power state when the operation lever is moved by mistake is suppressed, and the normal power state can be restored. At the time of returning of , it is possible to obtain the effect of smoothly transitioning to the desired operation.

<Modification 2>

In the first embodiment, when the first release condition in which the operating levers 14 and 34 are simultaneously operated is satisfied, the controller 50 is configured to operate the swing motor 43 even when the operating lever 34 is operating The power limit control was released. However, even when the first release condition in which the operation levers 14 and 34 are simultaneously operated is satisfied, when the operation lever 34 operates the turning motor 43, the power limiting control is not released, and the operation lever ( 34), you may comprise so that power reduction control may be cancelled|released only when the turning motor 43 is not operating.

14 and 15, such a modified example will be described.

Fig. 14 is a block diagram similar to Fig. 6 showing the function of the power calculating unit 50c of the controller 50 in the present embodiment.

In Fig. 14, the power calculation unit 50c (see Fig. 5) has a power reduction determination unit 50c-5D, and the power reduction determination unit 50c-5D includes a first lever no operation flag F14(t). , 1st lever no operation time (Tu14(t)), 1st lever operation time (Tc14(t)), 2nd lever no operation flag (F34(t)), 2nd lever no operation time (Tu34(t)) ), the second lever operation time Tc34(t), in addition to the switch flag Fsw(t), the front-rear direction of the operation lever 34 corresponding to the operation instruction of the turning motor 43 for right turning and left turning. The sensor values P47l(t), P47r(t) of the pressure sensors 47l and 47r for detecting the operation state of are input.

FIG. 15 is a flowchart showing the calculation flow of the power reduction determination unit 50c-5D of FIG. 14 .

In Fig. 15 , step S530 is added to the calculation flow of the power reduction determination unit 50c-5D, and in step S508, the power reduction determination unit 50c-5D sets the second lever no operation flag F34(t). ) is false, it is determined as "No", and the process proceeds to step S530.

In step S530, the power reduction determination unit 50c-5D determines whether the sensor value P47l(t) is greater than a threshold value Pth or whether the sensor value P47r(t) is greater than a threshold value Pth. And when it is determined that either one of the sensor value P47l(t) and the sensor value P47r(t) is greater than the threshold value Pth (when the operation lever 34 operates the turning motor 43), , proceeds to the process of step S514, and when it is determined that both the sensor value P47l(t) and the sensor value P47r(t) are not greater than the threshold value Pth (the operation lever 34 activates the turning motor 43) If not operated), the processing proceeds to step S515.

In step S514 , the power reduction determination unit 50c - 5D sets the power reduction flag F50(t) to true and sets the target rotation speed of the engine 6 to the target rotation speed indicating device 77 . The power reduction control is performed by reducing the normal value indicated by the . In step S515 , the power reduction determination unit 50c - 5D sets the power reduction flag F50(t) to false and sets the target rotation speed of the engine 6 to the target rotation speed indicating device 77 . The normal value indicated by

Thus, in this modified example, when it is determined with "No" in step S508 and the first release condition in which the first and second operation levers 14 and 34 are simultaneously operated in a state in which the power is reduced is satisfied, the step When it is determined "No" in S530 and the second operation lever 34 is not operating the turning motor 43, the power reduction control is canceled.

In the modified example configured in this way, similarly to the first embodiment, the return to the normal power state when the operation lever is moved by mistake is suppressed, and the desired operation is smoothly performed upon return to the normal power state. When the two operation levers 14 and 34 are simultaneously operated in order to cancel the power reduction control, the upper swing body 102 does not swing, so the deterioration of operability can be prevented. there is.

<Modification 3>

In the first embodiment, the operating lever devices 114 and 134 are hydraulic pilot systems including pilot valves, and the operating state detecting device includes pressure sensors 17b, 17r, 27b for detecting the operating pressure generated by the pilot valve; 27r, 37b, 37r, 47l, and 47r) have been described, but the operation state detecting device may have a configuration other than that. For example, a signal pressure generating conduit for guiding the discharge oil of the pilot pump 51 to the tank 5 is provided, a plurality of signal pressure generating valves are disposed in the signal pressure generating conduit, and the signal pressure generating valve is The operating state of the operating lever device may be detected by detecting the pressure in the signal pressure generating line that is switched by the operating pressure generated by the pilot valve and changed by opening or closing the signal pressure generating valve. Also in this case, the pressure sensor detects the operation state of the operation lever devices 114 and 134 similarly to the pressure sensor which detects an operation pressure, and the effect similar to 1st Embodiment can be acquired.

<Second embodiment>

A second embodiment of the present invention will be described with reference to FIGS. 16 to 19 . In addition, this embodiment is demonstrated centering on the part different from 1st Embodiment, and description is abbreviate|omitted about the part similar to 1st Embodiment.

First, the configuration of the drive system in the second embodiment will be described. 16 is a diagram showing the configuration of the drive system according to the present embodiment.

In Fig. 16, the driving system of the second embodiment differs from the first embodiment in that the hydraulic pump 1 is driven by a DC electric motor 60A, and the electric motor 60A is a battery 62 is electrically connected to, the electric motor 60A is driven by the electric power supplied from the battery 62, the battery output from the battery 62 is controlled by the battery output control panel 63, The battery output control panel 63 is electrically connected to the controller 50A, and the battery output control panel 63 controls output power based on target battery output information transmitted from the controller 50A.

Here, the battery 62 is a power supply device, and this power supply device and electric motor 60A constitute a power source.

Next, the function of the controller 50A in the second embodiment will be described. 17 is a block diagram showing the function of the controller 50A.

In Fig. 17 , the controller 50A in the second embodiment differs from the first embodiment in that a power calculating unit 50cA is provided instead of the power calculating unit 50c, and the power calculating unit 50cA is a sensor signal converting unit. The pressure information and switch flag transmitted from 50a, constant information and table information transmitted from the constant/table storage unit 50b are received, and a target value (target battery output) of the battery output is calculated. The target battery output calculated by the power calculating unit 50cA is transmitted to the battery output control panel 63 , and the battery output control panel 63 controls the output of the battery 62 based on the value.

Next, the function of the power calculating part 50cA in 2nd Embodiment is demonstrated. 18 is a block diagram showing the function of the power calculating unit 50cA.

In Fig. 18, the power calculation unit 50cA in the second embodiment differs from the first embodiment in that a power reduction determination unit 50c-5A is provided instead of the power reduction determination unit 50c-5; The power reduction determination unit 50c-5A outputs the target battery output. The input of the power reduction determination unit 50c-5A is the same as that of the power reduction determination unit 50c-5.

Next, the calculation flow of the power reduction determination part 50c-5A in 2nd Embodiment is demonstrated. 19 is a flowchart showing the calculation flow of the power reduction determination unit 50c-5A.

In Fig. 19 , the calculation flow of the power reduction determination unit 50c-5A in the second embodiment differs from the first embodiment in that the processing of step S516 instead of step S510 and the processing of step S517 instead of step S511 are performed. , the process of step S518 instead of step S512, the process of step S519 instead of step S513, the process of step S520 instead of step S514, and the process of step S521 instead of step S515.

In step S516, the power reduction determination unit 50c-5A sets the power reduction flag F50(t) to true and reduces the target battery output more than normal. Then, the target battery output is transmitted to the battery output control panel 63 . Steps S518 and S520 also perform the same processing as that of step S516.

In step S517, the power reduction determination unit 50c-5A sets the power reduction flag F50(t) to false and sets the target battery output to the normal value. Then, the target battery output is transmitted to the battery output control panel 63 . Steps S519 and S521 also perform the same processing as that of step S517.

In the second embodiment configured as described above, even when the power source is constituted by the battery 62 (electric power supply device), the electric motor 60A, and the hydraulic pump 1, similarly to the first embodiment, the power source is reduced in power. When the first release condition in which the two operation levers 14 and 34 of each of the operation lever devices 114 and 134 are simultaneously operated in , or one operation lever is continuously operated for a second predetermined time Tth2 or longer When the second cancellation condition to be used is satisfied, the controller 50 determines that the operator has "the intention to cancel the power reduction", and cancels the power reduction control. In this way, power reduction control can be performed when the operation lever is not operated, and the return to the normal power state when the operation lever is moved by mistake is suppressed, and when the operation lever is returned to the normal power state, power reduction control can be performed. You can smoothly transition to the desired action.

<Modified example>

In 2nd Embodiment, although the power source of the drive system was comprised with 60 A of DC electric motors and the hydraulic pump 1, instead of 60 A of DC electric motors, you may use an AC electric motor. 20 is a diagram showing a modified example of such a drive system.

In Fig. 20, the power source of the drive system is composed of an alternating current electric motor 60B and a hydraulic pump 1 . The hydraulic pump 1 is driven by an alternating current electric motor 60B, and the electric motor 60B is controlled by an inverter 61 . The inverter 61 is electrically connected to the controller 50 , and is receiving information about the target rotation speed from the controller 50 . The controller 50 calculates the target rotation speed by performing the same processing as the controller 50 shown in FIG. 5 . Moreover, the inverter 61 is also electrically connected with the battery 62, and receives the electric power supplied to the electric motor 60B. Also in such a structure, the effect similar to 1st and 2nd embodiment can be acquired.

<Third embodiment>

A third embodiment of the present invention will be described with reference to Figs. In this embodiment, the power reduction is performed by lowering the electric potential in the drive system.

First, the configuration of the drive system in the third embodiment will be described. 21 is a diagram showing the configuration of the drive system according to the present embodiment.

In FIG. 21 , the controller 50C is electrically connected to an angle sensor 72 , an angle sensor 73 , an angle sensor 74 , an angle sensor 75 , and a switch 76 which will be described later, and these sensors Signals of angle information and switch information are received from (72 to 75) and the switch 76. The controller 50C calculates the target battery output of the battery 62 based on such a signal, and transmits the target battery output to the battery output control panel 63 electrically connected to the controller 50C. The battery output control panel 63 controls the battery 62 so that it may become the target battery output.

The battery 62 is connected to the positive electrode side electric wire 81 and the negative electrode side electric wire 82 . Inverters 83 , 84 , 85 , 86 are connected in parallel to the positive electrode side electric wire 81 and the negative electrode side electric wire 82 .

The inverter 83 drives the electric motor 87, and the electric motor 87 also drives the cylinder 91 (boom cylinder). The cylinder 91 expands and contracts by converting the rotational motion of the electric motor 87 into a linear motion by a rack-and-pinion mechanism or the like. The inverter 83 receives the signal transmitted from the angle sensor 72, and controls the electric motor 87 so that it becomes the rotation speed according to the information.

The inverter 84 drives the electric motor 88, and the electric motor 88 also drives the cylinder 92 (female cylinder). The cylinder 92 expands and contracts by converting the rotational motion of the electric motor 88 into linear motion by a rack-and-pinion mechanism or the like. The inverter 84 receives the signal transmitted from the angle sensor 73, and controls the electric motor 88 to be the rotation speed according to the information.

The inverter 85 drives the electric motor 89, and the electric motor 89 also drives the cylinder 93 (bucket cylinder). The cylinder 93 expands and contracts by converting the rotational motion of the electric motor 89 into linear motion by a rack-and-pinion mechanism or the like. The inverter 85 receives the signal transmitted from the angle sensor 74, and controls the electric motor 89 so that it becomes the rotation speed according to the information.

The inverter 86 drives the electric motor 90 . The inverter 86 receives the signal transmitted from the angle sensor 75, and controls the electric motor 90 (swivel motor) so that it becomes the rotation speed according to the information.

Here, the battery 62 is a power supply device, and this power supply device constitutes a power source. In addition, the electric motor 87 and the cylinder 91, the electric motor 88 and the cylinder 92, the electric motor 89 and the cylinder 93, and the electric motor 90 are operated by receiving power from a power source. A plurality of actuators are constituted, and the inverters 83, 84, 85, and 86 transmit power to a plurality of actuators (electric motor 87 and cylinder 91, electric motor 88 and cylinder 92, electric motor 89). ) and the cylinder 93 and the electric motor 90) constitute a power distribution device. Operation lever devices 314 and 334 described later include a plurality of actuators (electric motor 88 and cylinder 92, electric motor 89 and an electric motor 89) with respect to a power distribution device (inverters 83, 84, 85, 86). The distribution amount of the said power to the cylinder 93 and the electric motor 90 is instruct|indicated.

Next, the structure of the operation signal system in 3rd Embodiment is demonstrated using FIG.22 and FIG.23.

22 is a diagram showing the configuration of an operation signal system of the drive system according to the third embodiment.

In Fig. 22, the operation signal system in the third embodiment differs from the operation signal system in the first embodiment shown in Fig. 4 by providing the operation lever device 314 instead of the operation lever device 114, and the operation lever device The point is that the operation lever device 334 is provided instead of (134). The operation lever apparatuses 314 and 334 are electric lever systems, and the operation lever apparatus 314 is the lever 14 and the angle sensor 72 which outputs the angle information of the forward direction 14b and the rear direction 14r. ) and an angle sensor 73 that outputs information on angles in the left direction 24b and the right direction 24r. The operation lever device 334 outputs the angle sensor 74 which outputs the information of the angle of the right direction 34b and the left direction 34r, and the information of the angle of the front direction 44l and the rear direction 44r It has an angle sensor 75 that

The angle sensors 72 , 73 , 74 , and 75 constitute a plurality of operation state detection devices that detect the operation states of the operation lever devices 314 , 334 .

The angle sensors 72, 73, 74, and 75 are electrically connected to the controller 50C. The angle sensor 72 is also electrically connected to the inverter 83, and transmits angle information. The angle sensor 73 is also electrically connected to the inverter 85, and transmits angle information. The angle sensor 74 is also electrically connected to the inverter 84, and transmits angle information. The angle sensor 75 is also electrically connected to the inverter 86, and transmits angle information.

23 : is a figure which shows the relationship between the inclination of the front-back directions 14b, 14r of the lever 14, and the target rotation speed of the electric motor 87. As shown in FIG. As shown in FIG. 23, as the lever 14 inclines to the forward direction 14b, the target rotation speed of the electric motor 87 becomes large clockwise. In addition, at the time of no operation, the target rotation speed of the electric motor 87 becomes zero. As the lever 14 inclines in the rear direction 14r, the target rotation speed of the electric motor 87 increases in the counterclockwise direction.

When the lever 14 is inclined in the right direction 24r/left direction 24b, the lever 34 moves in the right direction 34b/left direction 34r and the forward direction 44l/rear direction 44r. Similarly, the target rotation speed of the electric motors 88, 89, 90 changes also when it inclines.

Next, the function of the controller 50C in the third embodiment will be described. 24 is a block diagram showing the function of the controller 50C.

In Fig. 24, the controller 50C in the third embodiment differs from the second embodiment in that the sensor signal conversion unit 50aC is provided instead of the sensor signal conversion unit 50a, and instead of the power calculating unit 50cA, the controller 50C is provided. The point is that the power calculating unit 50cC is provided.

The sensor signal conversion unit 50aC receives signals transmitted from the angle sensors 72 to 75 and the switch 76 and converts them into angle information and switch flag information. The sensor signal converting unit 50aC transmits the converted angle information and switch flag information to the power calculating unit 50cC.

The constant/table storage unit 50b stores constants and tables necessary for calculation, and transmits them to the power calculation unit 50cC.

Power calculation unit 50cC receives angle information and switch flag information transmitted from sensor signal conversion unit 50aC, constant information and table information transmitted from constant/table storage unit 50b, and Calculate the target battery output. Then, the power calculating unit 50cC outputs the target battery output value to the battery output control panel 63 . The battery output control panel 63 controls the output of the battery 62 based on the value.

The sensor signal conversion processing in the sensor signal conversion unit 50aC will be described. Fig. 25 is a diagram for explaining the conversion processing performed by the sensor signal conversion unit 50aC, when the lever 14 is inclined in the forward direction 14b or the rear direction 14r.

As shown in FIG. 25 , the sensor signal conversion unit 50aC converts the sensor value A72(t) to increase as the lever 14 inclines in the forward direction 14b. In addition, it is converted so that the sensor value A72(t) becomes 0 when there is no operation. When the lever 14 is inclined in the rear direction 14r, the sensor value A72(t) becomes a negative value. When the lever 14 is inclined in the right direction 24r/left direction 24b, the lever 34 moves in the right direction 34b/left direction 34r and the forward direction 44l/rear direction 44r. The same applies when tilted. The sensor value A72(t) is a value corresponding to the target rotation speed of the electric motor 87 in FIG. 23 .

Next, the function of the power calculating part 50cC in 3rd Embodiment is demonstrated. Fig. 26 is a block diagram showing the function of the power calculating section 50cC. It is assumed that the sampling time of the controller 50C is Δt.

In Fig. 26, the power calculating unit 50cC in the third embodiment differs from the first embodiment in that the first lever operation state determination unit 50c-1C instead of the first lever operation state determination unit 50c-1 is In place of the second lever operation state determination unit 50c-2, a second lever operation state determination unit 50c-2C is provided, and instead of the power reduction determination unit 50c-5, the second embodiment and It is a point provided with the same power reduction determination part 50c-5C.

Next, the function of the 1st lever operation state determination part 50c-1C in 3rd Embodiment is demonstrated. 27 is a flowchart showing the calculation flow of the first lever operation state determination unit 50c-1C. This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

The difference between the calculation flow of the first lever operation state determination unit 50c-1C and the calculation flow of the first lever operation state determination unit 50c-1 in the first embodiment shown in FIG. 7 is step S102 to step S102. The point is that the process of S105 disappears and the process proceeds from step S101 to the processes of steps S110 and S111.

In step S110, the 1st lever operation state determination part 50c-1C determines whether the absolute value of sensor value A72(t) is smaller than threshold value Ath. When the absolute value of sensor value A72(t) is smaller than threshold value Ath, it determines with "YES", and progresses to the process of step S111. When the absolute value of the sensor value A72(t) is equal to or greater than the threshold Ath, it is determined as "No", and the process proceeds to step S107.

In step S111, the 1st lever operation state determination part 50c-1C determines whether the absolute value of sensor value A73(t) is smaller than threshold value Ath. When the absolute value of sensor value A73(t) is smaller than threshold value Ath, it determines with "Yes", and it progresses to the process of step S106. When the absolute value of the sensor value A73(t) is equal to or greater than the threshold Ath, it is determined as "No", and the processing proceeds to step S107.

In step S106, the first lever no operation flag F14(t) is set to true, and in step S107, the first lever no operation flag F14(t) is set to false, respectively. These flag information are transmitted to the 1st lever operation time measurement part 50c-3 and the power reduction determination part 50c-5C.

Next, the function of the 2nd lever operation state determination part 50c-2C in 3rd Embodiment is demonstrated. Fig. 28 is a flowchart showing the calculation flow of the second lever operation state determination unit 50c-2C. This arithmetic flow is repeated for each sampling time Δt while the controller 50 is operating, for example.

The difference between the calculation flow of the second lever operation state determination unit 50c-2C and the calculation flow of the second lever operation state determination unit 50c-2 in the first embodiment shown in FIG. 8 is steps S202 to steps S202. The point is that the processing of S205 is lost and the processing proceeds from step S201 to the processing of steps S210 and S211.

In step S210, the 2nd lever operation state determination part 50c-2C determines whether the absolute value of sensor value A74(t) is smaller than threshold value Ath. When the absolute value of sensor value A74(t) is smaller than threshold value Ath, it determines with "YES", and progresses to the process of step S211. When the absolute value of sensor value A74(t) is more than threshold value Ath, it determines with "No", and it progresses to the process of step S207.

In step S211, the 2nd lever operation state determination part 50c-2C determines whether the absolute value of sensor value A75(t) is smaller than threshold value Ath. When the absolute value of the sensor value A75(t) is smaller than the threshold value Ath, it determines with "YES", and it progresses to the process of step S206. When the absolute value of the sensor value A75(t) is equal to or greater than the threshold Ath, it is determined as "No", and the processing proceeds to step S207.

In step S206, the second lever no operation flag F34(t) is set to true, and in step S207, the second lever no operation flag F34(t) is set to false, respectively. These flag information are transmitted to the 2nd lever operation time measurement part 50c-4 and the power reduction determination part 50c-5C.

In this way, the first lever operation state determination unit 50c-1C determines whether or not the lever 14 is operated from the sensor value A72(t) and the sensor value A73(t), and the first lever is not The operation flag F14(t) is output. The second lever operation state determination unit 50c-2C determines whether or not the lever 34 is operated from the sensor value A74(t) and the sensor value A75(t), and the second lever is not operated. A flag F34(t) is output.

In the 1st lever operation time measuring part 50c-3, 1st lever non-operation time Tu14(t) and 1st lever operation time Tc14(t) are measured. This time information is transmitted to the power reduction determination unit 50c - 5C.

The second lever operation time measurement unit 50c-4 measures the second lever non-operation time Tu34(t) and the second lever operation time Tc34(t). This time information is transmitted to the power reduction determination unit 50c - 5C.

The power reduction determination unit 50c-5C, like the power reduction determination unit 50c-5A of the second embodiment illustrated in FIG. 18 , follows the procedure of the flowchart illustrated in FIG. 19 , whether to reduce the battery output or not. to output the target battery output and the power reduction flag F50(t). The target battery output is transmitted to the battery output control panel 63, which controls the battery 62 so that it becomes the target battery output.

In the third embodiment configured as described above, even when the power source is constituted by the battery 62 (electric power supply device) and the actuator is constituted by the electric actuator including the electric motors 87 to 90, similarly to the first embodiment. , when the first release condition in which the two operation levers 14 and 34 of each of the operation lever devices 314 and 334 are simultaneously operated in the power reduction state of the power source is satisfied, or when one operation lever is operated for a second predetermined time ( Tth2) When the second cancellation condition continuously operated above is satisfied, the controller 50 determines that the operator has "the intention to cancel the power reduction", and cancels the power reduction control. In this way, power reduction control can be performed when the operation lever is not operated, and the return to the normal power state when the operation lever is moved by mistake is suppressed, and when the operation lever is returned to the normal power state, power reduction control can be performed. You can smoothly transition to the desired action.

1: hydraulic pump (power source) 2: pipeline
3: relief valve 4: relief pipe
5: Tank 6: Engine (Power Source)
7: speed control device 8: tandem conduit
9: Parallel line 10, 20, 30, 40: Check valve
11, 21, 31, 41: pipeline
12, 22, 32, 42: directional control valve (power distribution unit)
12r, 12b, 22r, 22b, 32r, 32b, 42r, 42l: pilot line
13, 23, 33: Cylinder (actuator) 13B, 23B, 33B: Bottom line
13R, 23R, 33R: rod line 13T, 23T, 33T, 43T: tank line
13C, 23C, 33C, 43C: Center bypass line
14: operation lever (first operation lever)
15r, 15b, 25r, 25b, 35r, 35b, 45r, 45l: pilot valve
16r, 16b, 26r, 26b, 36r, 36b, 46r, 46l: pipeline
17r, 17b, 27r, 27b, 37r, 37b, 47l, 47r: pressure sensor (operational state detection device)
18, 28, 38, 48: Conduit 19, 29, 39, 49: Conduit
34: operation lever (second operation lever) 43: hydraulic motor
43L: Left turn pipe 43R: Right turn pipe
50: controller 51: pilot pump
52: pilot line 53: relief valve
60A: Electric motor (DC) (Power source) 60B: Electric motor (AC) (Power source)
61: inverter 62: battery (power supply; power source)
63: battery output control panel
72, 73, 74, 75: Angle sensor (operation state detection device)
76: switch 81: positive electrode side wire
82: negative electrode side wire
83, 84, 85, 86: Inverter (power distribution unit)
87, 88, 89, 90: Electric motor (AC) (actuator)
91, 92, 93: Cylinder (actuator) 94, 95, 96, 97: Tightening
114, 134: operation lever device 314, 334: operation lever device

Claims (6)

power source and
A plurality of actuators operated by receiving the power output from the power source;
a plurality of operation levers for instructing the distribution amount of the power to the plurality of actuators;
a plurality of operation state detection devices for detecting operation states of the plurality of operation levers;
and a controller for controlling the power source;
The plurality of operation levers have first and second operation levers for operating other actuators among the plurality of actuators,
In the construction machine, the controller performs power reduction control for reducing the power when the non-operational state of the first and second operating levers continues.
wherein the controller releases the power reduction control when a first release condition in which the first and second operation levers are simultaneously operated in a state in which the power is reduced is satisfied. According to claim 1, wherein the controller,
Even when the first release condition is not satisfied, one of the first and second operation levers is operated while the power is reduced, and the operation state of the one operation lever continues for a predetermined time. 2 When a release condition is satisfied, the power reduction control is canceled. The method according to claim 1, further comprising: a lower traveling body; an upper revolving body mounted rotatably on the lower traveling body;
The plurality of actuators includes a turning motor for turning the upper swing body with respect to the lower traveling body, and first, second, and third front actuators for driving the front working machine,
The first operation lever is an operation lever for operating the first and second front actuators, and the second operation lever is an operation lever for operating the swing motor and the third front actuator,
The plurality of operation state detection devices includes: a first operation state detection device that detects an operation state of the first operation lever when the first operation lever operates the first front actuator; a second operation state detection device for detecting an operation state of the first operation lever when the second front actuator is operated; and the second operation lever when the second operation lever operates the third front actuator. a third operation state detection device for detecting an operation state of
The controller is configured to: When the first release condition in which the first and second operation levers are simultaneously operated based on the detection results of the first, second, third and fourth operation state detection devices is satisfied, The power reduction control is canceled when the second operation lever is not operating the turning motor. According to claim 1, wherein the power source comprises an engine and a hydraulic pump,
The power source generates the power by driving the hydraulic pump by the engine,
wherein the controller performs the power reduction control by reducing the rotation speed of the engine. The power source according to claim 1, wherein the power source includes a power supply device, an electric motor, and a hydraulic pump;
The power source generates the power by driving the electric motor by supply of electric power from the electric power supply device and driving the hydraulic pump by the electric motor;
The said controller performs the said power reduction control by reducing the power supply to the said electric motor and reducing the rotation speed of the said electric motor, The construction machine characterized by the above-mentioned. The power source of claim 1 , wherein the power source comprises a power supply;
The actuator is an electric actuator including an electric motor,
The power source drives the electric actuator by power supply from the power supply device,
wherein the controller reduces the electric power supplied to the electric motor from the electric power supply device and reduces the rotation speed of the electric motor to reduce the power.

Images