JP6807289B2 - Construction machinery - Google Patents

Description

The present invention relates to construction machinery.

Hydraulic excavators, which are a type of construction machine, are used in various situations. For example, in addition to excavation work, loading work into dump trucks, and leveling work, crushing work using a breaker and crushing work using a subdivision machine, etc. It is used for various tasks. In this way, since construction machines are used for a wide variety of tasks, there may be situations where more force and speed are required depending on the work content and situation.

For example, in Patent Document 1, when a signal for turning on an active mode switch is received in a construction machine such as a hydraulic excavator, the product of the pump discharge pressure P and the pump discharge amount Q is higher than a predetermined value in normal operation. The constant horsepower curve Ha of PQ in active mode is set, and when a signal for turning on the power mode switch and a signal for turning on the work equipment lever switch are received, the pump discharge pressure P and the pump discharge amount are received. Disclosed is a technology that increases the force and work speed during work by making the product with Q the equal horsepower curve Ha of PQ in active mode, which is one step higher than the equal horsepower curve Ha of PQ in active mode. Has been done.

Japanese Patent No. 3925666

However, in the above-mentioned conventional technique, when the work is performed by increasing the force and speed more than usual, it is necessary to set the active mode in advance. Therefore, the active mode is used even in situations other than the actual situation where the force and speed are desired to be increased. The work will be done on the equal horsepower curve of PQ, which will lead to wasteful fuel consumption and an increase in CO2 emissions. Further, if it is desired to further increase the force and speed, it is necessary to operate the power mode switch each time during the work operation, which imposes a burden on the operator.

The present invention has been made in view of the above, and an object of the present invention is to provide a construction machine capable of appropriately increasing force and speed only in the work required by the operator while reducing the burden of operation by the operator. To do.

The present application includes a plurality of means for solving the above problems, for example, a prime mover, one or more variable displacement hydraulic pumps driven by the prime mover, and discharge from the hydraulic pump. One or more hydraulic actuators driven by pressure oil, and a flow control valve that controls the flow rate of pressure oil supplied from the hydraulic pump to the one or more hydraulic actuators according to the amount of operation of the operating device. The relationship between the operation amount detection device that detects the operation signal output from the operation device and the discharge pressure and the discharge flow rate in the hydraulic pump so that the absorption horsepower of the hydraulic pump becomes a predetermined value for the operation of the hydraulic pump. In a construction machine provided with a controller that controls according to the characteristic lines shown, the controller has a signal path independent of the signal path from the operating device, and includes a setting switch provided in the operating device. Based on the operation signal output from the operation device when the setting switch is operated during the operation of the operation device, the operation timing for switching to the operation for increasing the output of the hydraulic actuator is set, and the operation is performed. The characteristic line so that the absorption horsepower of the hydraulic pump increases when it is determined that the operation timing is set by the setting switch based on the operation signal output from the operation device detected by the amount detection device. Is switched to the output increase characteristic line in which the predetermined output value is increased, and one of the prime mover and the hydraulic pump is controlled based on the output increase characteristic line.

According to the present invention, while reducing the burden of operation by the operator, the force and speed can be appropriately increased only in the work required by the operator, and the unnecessary increase in force and work speed during work can be suppressed. Can be done.

It is a side view which shows typically the appearance of the hydraulic excavator which is an example of the construction machine which concerns on 1st Embodiment. It is a figure which extracts and schematically shows the main part of the hydraulic circuit system which concerns on 1st Embodiment together with the related structure of this invention. It is a figure which shows the specific example of setting of the output up condition in auto power-up control. It is a figure which shows the specific example of the change of the target pump torque when each operation amount satisfies the output increase condition. It is a figure which shows an example of the change of the horsepower curve such as PQ of the hydraulic pump in the auto power-up control. It is a flowchart of output up condition setting in auto power-up control. It is a flowchart which shows the process of auto power-up control. It is a figure which shows the transition of the setting screen displayed on the monitor in the output up condition setting. It is a figure which shows the transition of the setting screen displayed on the monitor in the output up condition setting. It is a figure which shows the transition of the setting screen displayed on the monitor in the output up condition setting. It is a functional block diagram which shows the arithmetic processing function of the control signal output from a controller to a pump torque control solenoid valve, and is the figure which shows the case where only one item is set on the setting screen. It is a functional block diagram which shows the arithmetic processing function of the control signal output from a controller to a pump torque control solenoid valve, and is the figure which shows the case where a plurality of items are set on the setting screen. It is a functional block diagram which shows the arithmetic processing function of the control signal output from the controller in 2nd Embodiment to the engine rotation speed control part (not shown) of an engine. It is a figure which extracts and schematically shows the main part of the hydraulic circuit system which concerns on 3rd Embodiment together with the related structure of this invention. It is a figure which shows the specific example of setting of the output up condition in the auto power-up control which concerns on 3rd Embodiment. It is a figure which shows typically the main part of the hydraulic circuit system which concerns on the modification of 3rd Embodiment by extracting with the related structure of this invention. It is a figure which shows the specific example of setting of the output up condition in the auto power-up control which concerns on the modification of the 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as an example of a construction machine, a hydraulic excavator having a bucket as a work tool at the tip of a front device (front work machine) will be described as an example, but an attachment other than the bucket such as a breaker or a magnet will be described. It is also possible to apply the present invention to the provided hydraulic excavator. It is also possible to apply the present invention to construction machines (including work machines) other than hydraulic excavators equipped with a work arm such as a crane car.

<First Embodiment>
The first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 is a side view schematically showing the appearance of a hydraulic excavator which is an example of a construction machine according to the present embodiment. Further, FIG. 2 is a diagram schematically showing a main part of the hydraulic circuit system according to the present embodiment, together with a related configuration of the present invention.

In FIG. 1, the hydraulic excavator 100 is an articulated front device (front) configured by connecting a plurality of driven members (boom 31, arm 33, bucket (working tool) 35) that rotate in each vertical direction. The work machine) 30 and the upper swivel body 20 and the lower traveling body 10 constituting the vehicle body are provided, and the upper swivel body 20 is provided so as to be rotatable with respect to the lower traveling body 10. The upper swivel body 20 is configured by arranging each member on a swivel frame 21 which is a base, and the swivel frame 21 constituting the upper swivel body 20 can swivel with respect to the lower traveling body 10. Further, the base end of the boom 31 of the front device 1 is rotatably supported by the front portion of the upper swing body 20 in a vertical direction, and one end of the arm 33 is an end portion (tip) different from the base end of the boom 31. The bucket 35 is rotatably supported in the vertical direction at the other end of the arm 33.

The boom 31, arm 33, bucket 35, upper swivel body 20, and lower traveling body 10 are the boom cylinder 32, the arm cylinder 34, the bucket cylinder 36, the swivel motor 23, and the left and right traveling motors 11 (however, the left and right traveling motors 11). Only one traveling motor is driven by (shown). On the swivel frame 21 constituting the upper swivel body 20, along with the engine 22 which is a prime mover, each hydraulic actuator 11, 23 such as a boom cylinder 32, an arm cylinder 34, a bucket cylinder 36, a swivel motor 23, and left and right traveling motors 11 , 32, 34, 36 are mounted on the hydraulic circuit system 40 for driving.

In FIG. 2, the hydraulic circuit system 40 is a variable displacement hydraulic pump driven by an engine 22 that operates based on a control signal input from a controller 49 that controls the operation of the entire hydraulic excavator 100 via a signal path 22a. Tilt of the hydraulic pump 41 based on the 41, the fixed capacitance type pilot pump 44 driven by the engine 22, and the pilot pressure (control signal) input from the pilot pump 44 via the pump torque control electromagnetic valve 45. A pump torque control electromagnetic valve that controls a control signal (pilot pressure) input to the regulator 46 based on a regulator 46 that controls the angle (discharge flow rate) and a control signal input from the controller 49 via the signal path 45a. A control valve (flow control valve) 42 for controlling the direction and flow rate of hydraulic oil supplied from the hydraulic pump 41 driven by the engine 22 to the hydraulic actuators 11, 23, 32, 34, 36 is provided. There is. In FIG. 2, for the sake of simplicity, the hydraulic actuators 11, 23, 32, 34, 36 are represented by the flood control actuators 43a, 43b instead. That is, the hydraulic actuators 43a and 43b are the hydraulic actuators 11, 23, 32, 34 and 36.

In the driver's cab (cab) 57 on which the operator is boarded, a plurality of operation lever devices (operation devices) 50 (one in the present embodiment) that output operation signals for operating the hydraulic actuators 23, 32, 34, 36 are provided. (Illustrated on behalf of only) is provided. The control valve 42 is operated by an operation signal (pilot pressure) discharged from a pilot pump 44 driven by the engine 22 and output from an oil passage (not shown) via an operation lever device 50. Although not shown, the plurality of operating lever devices 50 can be tilted back and forth and left and right, respectively, and the control valve is based on the pilot pressure (operation signal) according to the operating direction and operating amount of the operating lever device 50 operated by the operator. By controlling 42, the operation of each of the hydraulic actuators 23, 32, 34, 36 is controlled. That is, the operations of the hydraulic actuators 23, 32, 34, and 36 are assigned to the front-rear direction or the left-right direction of the operation lever device 50, respectively. In the signal path of the operation signal output from the operation lever device 50 to the control valve 42, a pressure sensor (operation amount detection device) 53a, which detects the pilot pressure as the operation signal (that is, the operation amount of the operation lever device 50), 53b is provided, and the detection result is input to the controller 49 via the signal paths 53f and 53g, respectively.

The operation lever device 50 may be of an electric signal system, and includes a detection device that electrically detects the tilt amount of the lever, that is, the lever operation amount, which is the operation signal of the operation lever device 50 operated by the operator. The lever operation amount detected by the detection device is output to the controller 49, which is a control device, via electrical wiring, and the hydraulic actuators 23, 32, 34, and 36 are driven by controlling the electromagnetic proportional valve and the like with the controller 49. It may be configured as.

Further, in the cab 57, a monitor (display device) 55 for displaying various information about the hydraulic excavator 100, a setting screen, and the like based on a control signal input from the controller 49 via the signal path 55a, and a monitor. An operation switch 56 that outputs signals for operating various setting screens displayed on the 55 to the controller 49 via the signal path 56e is arranged, and the operation lever device 50 includes hydraulic actuators 23, 32, 34, 36. A lever switch having an operation signal signal path 58a that is independent of the operation signal signal paths 50a and 50b of the operation lever device 50 so that it can be operated in parallel with the operation (that is, at the same time as the operation of the operation lever device 50). 58 (setting switch) is arranged. The operation switch 56 is for operating various setting screens and the like displayed on the monitor 55. For example, the direction instruction button 56a for moving the position of the instruction display such as the cursor displayed on the monitor 55 in the vertical direction. It includes a 56b, a decision button 56c for determining the selected content, a cancel button 56d for canceling the selected content and returning to the previous process, and the like.

The operation switch 56 is not limited to the above configuration because it suffices to operate the contents displayed on the monitor 55. For example, the operation switch 56 is selected or determined by rotating and pressing the rotation switch. The configuration may be adopted.

The controller 49 controls the operation of the entire hydraulic excavator 100, and determines the relationship between the discharge pressure of the hydraulic pump 41 and the discharge flow rate so that the absorption horsepower of the hydraulic pump 41 becomes a predetermined value. In addition to controlling the rotation speed of the engine 22 and the discharge flow rate of the hydraulic pump 41 according to the characteristic line shown), auto power-up control is performed.

In the auto power-up control, when the function as the setting switch of the lever switch 58 is enabled (described later), the lever switch (setting switch) 58 is operated during the operation of the operation lever device (operation device) 50. Output up condition (or auto power up setting condition) for switching to high output operation that increases the output of the hydraulic actuators 23, 32, 34, 36 from the normal operation based on the operation amount of the operation lever device 50 at the time. When the operation amount of the operation lever device 50 detected by the pressure sensors (operation amount detection device) 53a and 53b satisfies the output up condition (that is, when the operation timing for switching to the high output operation is reached). ), The product of the pump discharge pressure P of the hydraulic pump 41 and the pump discharge flow rate Q (in other words, the absorbed horsepower of the hydraulic pump 41) is a high output that becomes a predetermined value larger (that is, increased) than during normal operation. The hydraulic pump 41 is controlled based on the PQ equal horsepower curve for operation (output increase characteristic line) and the PQ equal horsepower curve for high output operation.

In this embodiment, it is based on the boom raising operation amount, boom lowering operation amount, arm pulling operation amount, arm pushing operation amount, bucket excavation operation amount, bucket dump operation amount, left turning operation amount, and right turning operation amount. The case of setting the output up condition will be described as an example.

FIG. 3 is a diagram showing a specific example of setting an output up condition in the auto power-up control.

In FIG. 3, among the operations targeted in setting the output increase condition, the boom raising operation, the arm pulling operation, and the bucket excavation operation are performed, and the operation amount is significantly present (that is, the operation amount is 0 (that is, the operation amount is 0 in advance (that is,). Zero), which is a threshold value set near) and exceeds the threshold value for determining whether or not the operation lever device 50 is operated in the corresponding direction), and other operations (boom lowering operation, arm pushing operation, The case where there is no operation amount (in the case of non-operation) without performing the bucket dump operation and the left and right turning operation is illustrated. Note that, in FIG. 3, among the operations having no operation amount, the (left and right) turning operation is shown as a representative, and the other operations are not shown.

When the function of the lever switch 58 as a setting switch is enabled (described later), the output is increased by operating the lever switch 58 at a certain point in the state where the operator is operating the actuator shown in FIG. Conditions are generated and set. Each operation amount when the lever switch 58 is operated in this example is determined that the boom raising operation amount = Pi_boom, the arm pulling operation amount = Pi_arm, the bucket excavation operation amount = Pi_booket, and the other operation amounts are 0 (zero). Therefore, the generated output increasing condition is that the boom raising operation amount ≧ Pi_boom, the arm pulling operation amount ≧ Pi_arm, and the bucket excavation operation amount ≧ Pi_book. The operation determined that the operation amount is 0 (zero) and no operation is performed (non-operation) is not included in the output increase condition.

FIG. 4 is a diagram showing a specific example of a change in the target pump torque when each operation amount satisfies the output increase condition when the output increase condition shown in FIG. 3 is enabled. Further, FIG. 5 is a diagram showing an example of a change in the horsepower curve such as PQ of the hydraulic pump in the auto power-up control.

As shown in FIG. 4, when each operation amount satisfies the output increase condition, the target pump torque during normal operation is controlled to be increased based on a predetermined output increase rate (described later). At this time, as shown in FIG. 5, the product of the pump discharge pressure P of the hydraulic pump 41 and the pump discharge flow rate Q becomes a predetermined constant value larger than that in the normal operation, and the PQ iso-horsepower curve for high output operation is obtained. Since the hydraulic pump 41 is controlled based on this, the output of the hydraulic actuators 23, 32, 34, and 36 can be increased as compared with the normal operation. That is, the operator enables the function of the lever switch 58 as a setting switch, and the output up condition is set at the time of the working state (that is, the operating state of the operating lever device 50) in which the operator wants to increase the force during work and the working speed. By generating and setting, the force and speed can be increased in the work required by the operator. However, the PQ equihorsepower curve for normal operation and high output operation, that is, the maximum absorbed horsepower of the hydraulic pump 41 is controlled to be in a range smaller than the rated output horsepower curve of the engine.

Here, the auto power-up control will be described in more detail with reference to FIGS. 6 to 12.

FIG. 6 is a flowchart for setting output up conditions in auto power-up control, and FIG. 7 is a flowchart showing processing for auto power-up control. 8 to 10 are diagrams showing the transition of the setting screen displayed on the monitor in the output up condition setting.

In FIG. 6, the controller 49 first determines whether or not the auto power-up operation is set (step S100). As shown in FIG. 8, the setting screen displayed on the monitor 55 is operated by the direction indicator buttons 56a and 56b of the operation switch 56, "auto power-up" is selected, and the enter button 56c is pressed (procedure 1-1). On the setting screen that is displayed subsequently, set the output up condition (including the output up rate), select the item to be stored (for example, "setting 1"), and press the enter button 56c (procedure 1-2). ), On the setting screen that is displayed subsequently, whether to set the output up condition set for the item ("Setting 1") selected in step 1-2 to "Enable" or "Disable" (here, "" Select "Valid") and press the OK button 56c (Procedure 1-3), and on the setting screen that is displayed subsequently, set the "Operation setting" to enter the auto power-up operation setting state, or the output increase rate. Select the "output UP rate setting" (here, "operation setting") and press the enter button 56c (procedures 1-4). In this way, by performing the operations of steps 1-1 to 1-4 and selecting and determining the "operation setting" in step 1-4, the auto power-up operation setting state is set. If there is no item that has already been enabled before performing step 1-2, the valid or invalid setting of the item set in step 1-2 (here, "setting 1") is automatically set. The power-up control will be enabled or disabled.

If the determination result in step S100 is NO, that is, if the auto power-up operation setting state is not set, the process ends. If "invalid" is selected in step 1-3, the output up condition set in the item selected in step 1-2 (for example, "setting 1") becomes invalid, and step 1-1 Return to the setting screen.

Further, when the determination result in step S100 is YES, that is, when "operation setting" is selected in step 1-4 to set the auto power-up operation setting state, that is, the function of the lever switch 58 as a setting device is functioning. If it is enabled, it is determined whether or not the lever switch 58 has been turned ON (step S110), and if the determination result is NO, a certain period of time (for example, 60 seconds) from the YES determination in step S110. Is determined (step S111). If the determination result in step S111 is NO, step S110 for determining whether the lever switch 58 has been turned ON is repeated, and if the determination result in S111 is YES, that is, the lever switch 58 is not turned ON. When a certain period of time has passed, the process ends. The state in which the setting screen (here, the display prompting the ON operation of the lever switch 58) displayed by selecting "operation setting" in step 1-4 and pressing the enter button 56c is displayed (that is, auto). In the power-up operation setting state), if a certain period of time elapses without operating the lever switch 58, the screen returns to the setting screen of steps 1-4 (steps 1-5).

Further, when the determination result in step S110 is YES, that is, the setting screen displayed by selecting "operation setting" in step 1-4 and pressing the enter button 56c is displayed (auto power-up). When the lever switch 58 is turned ON within a certain period of time (operation setting state), the output up condition is set based on the operation amount of the operating lever device 50 when the lever switch 58 is turned ON (step). S120), the process is terminated. When the lever switch 58 is turned on within a certain period of time in step 1-5 (step 1-5), a message indicating that the output up condition is set is displayed (step 1-6), and after a certain period of time elapses, step 1-4. Return to the setting screen of. In this way, by operating the lever switch 58 to turn on the lever switch 58 during the operation of the operation lever device 50 that the operator wants to perform high output operation to generate and set the output increase condition, the force and speed are increased in the work required by the operator. be able to.

The output increase rate when the output increase condition is satisfied and the operation becomes high output is also set in the same procedure as the output increase condition setting. In FIG. 9, steps 1-1 to 1-3 are the same as the output up condition setting. On the setting screen displayed by selecting "Valid" in step 1-3 and pressing the enter button 56c, select "output UP rate setting" to set the output up rate and press the enter button 56c (procedure). 2-4) Then, when the setting value of the output up rate is input (for example, selectively set from the numerical candidates displayed in the pull-down or directly input) on the setting screen displayed subsequently, the enter button 56c is pressed (for example). Step 2-5) is displayed to the effect that the output increase rate has been set (step 2-6), and after a certain period of time, the screen returns to the setting screen of step 2-4.

In the transition of the setting screens shown in FIGS. 8 and 9, the case where the output up condition and the output up rate are set in separate flows has been described as an example, but as shown in FIG. 10, the output up condition and the output have been described. The up rate may be set in a series of steps.

In FIG. 10, steps 1-1 to 1-6 are the same as the output up condition setting in FIG. If the lever switch 58 is turned on within a certain period of time in step 1-5, a message indicating that the output up condition has been set is displayed (step 1-6), and after a certain period of time, "output" is displayed on the setting screen of step 1-4. The setting screen in which the "UP setting rate" is selected in advance is displayed. In this state, press the enter button 56c (step 3-7: corresponding to step 2-4 in FIG. 9), enter the output increase rate setting value on the setting screen displayed subsequently, and press the enter button 56c (step 3-7: corresponding to step 2-4 in FIG. 9). Step 3-8: Corresponds to Step 2-5 in Fig. 9), a message indicating that the output increase rate has been set is displayed (Procedure 3-9: Corresponds to Step 2-6m in Fig. 9), and the procedure occurs after a certain period of time. Return to the setting screen of 1-4.

Further, in FIGS. 8 to 10, the setting of "valid" or "invalid" of the item "setting 1", the output up condition setting, and the output up rate setting are illustrated on the setting screen of steps 1-3. As described above, the same settings can be made for other items "setting 2" and "setting 3", or other settings (not shown).

11 and 12 are functional block diagrams showing an arithmetic processing function of a control signal output from the controller to the pump torque control solenoid valve. FIG. 11 shows a case where only one item is set on the setting screen of steps 1-3.

In FIG. 11, the arithmetic processing function 49a calculates and outputs a command value to the pump torque control solenoid valve 45, and controls the pump torque (or discharge flow rate) of the hydraulic pump 41. As shown in FIG. 11, in the arithmetic processing function 49a, the reference pump torque command value 60 used in the normal operation is calculated, the coefficient (ratio) is integrated through the integration function unit 70, and the pump torque control solenoid valve 45 is reached. By outputting, the pump torque of the hydraulic pump 41 is controlled.

In FIG. 7, the controller 49 first calculates the pump torque and calculates the reference pump torque command value 60 (step S200). Subsequently, when the determination result in step S200 is NO, that is, when the auto power-up control is invalid, the non-output up coefficient 63a having a ratio of "1" is selected by the selection unit 65a and is selected by the integration function unit 70. Since it is input, the reference pump torque command value 60 is output as it is as a command value to the pump torque control solenoid valve 45 (step S220). Further, when the determination result in step S210 is YES, that is, when the auto power-up control is effective, it is determined whether or not the output up condition is satisfied (step S211). If the determination result in step S211 is NO, that is, if the output increase condition is not satisfied, the non-output increase coefficient 62a having a ratio of “1” is selected by the selection units 64a and 65a and input to the integration function unit 70. Therefore, the reference pump torque command value 60 is output as it is as a command value to the pump torque control solenoid valve 45 (step S220).

If the determination result in step S211 is YES, that is, if the auto power-up control is effective and the output-up condition is satisfied, the output-up rate 61a set in the output-up condition setting is the selection unit 64a. , 65a is selected and input to the integration function unit 70, the output increase rate 61a is integrated with the reference pump torque command value 60, and is output to the pump torque control solenoid valve 45 as the pump torque command value during high output operation ( Step S212).

FIG. 12 shows a case where a plurality of items (for example, "setting 1" and "setting 2") are set.

In FIG. 12, similarly to FIG. 11, the arithmetic processing function 49b calculates and outputs a command value to the pump torque control solenoid valve 45, and controls the pump torque (or discharge flow rate) of the hydraulic pump 41. .. Further, also in FIG. 12, in the calculation processing function 49b, the reference pump torque command value 60 used in the normal operation is calculated, the coefficient (ratio) is integrated through the integration function unit 70, and the pump torque control solenoid valve 45 is reached. By outputting, the pump torque of the hydraulic pump 41 is controlled.

In FIG. 12, the controller 49 first calculates the pump torque and calculates the reference pump torque command value 60. Subsequently, when the auto power-up control is invalid in each of "setting 1" and "setting 2", the non-output up coefficients 63a and 63b having a ratio of "1" are selected by the selection units 65a and 65b. Of these, one of the larger ratios selected by the maximum value selector function 71 (ratio "1" in this case) is input to the integration function unit 70, so the reference pump torque command value 60 is used as it is for the pump torque control solenoid valve 45. Is output as a command value to.

If the auto power-up control is enabled in at least one of "setting 1" and "setting 2" and neither of them satisfies the output up condition, the ratio "1" is set by the selection units 64a, 65a, 64b, 65b. The non-output up coefficients 62a and 62b of are selected, and one of the larger ratios (ratio "1" in this case) selected by the maximum value selector function 71 is input to the integration function unit 70, so that the reference pump The torque command value 60 is output as it is as a command value to the pump torque control solenoid valve 45.

If the auto power-up control is effective in at least one of "setting 1" and "setting 2" and the output up condition is satisfied, the output up rate 61a or the output up set in the output up condition setting is achieved. At least one of the rates 61b is selected by the selection units 64a, 65a, 64b, 65b and input to the maximum value selector function 71. For example, if the auto power-up control is effective in both "setting 1" and "setting 2" and the output up condition is satisfied, the output up rate 61a and the output up rate 61b are the maximum value selector functions. Since it is input to 71, the one with a large ratio is input to the integration function unit 70, integrated with the reference pump torque command value 60, and output to the pump torque control solenoid valve 45 as the pump torque command value during high output operation. Will be done. If one of the "setting 1" and "setting 2" auto power-up control is effective and the output-up condition is satisfied and the other is not satisfied, the output-up rate (61a) of one of the conditions is satisfied. Or 61b) is input to the maximum value selector function 71, and the non-output increase coefficient of the ratio "1" is input from the other. Therefore, the output increase rate (61a or 61b) having a large ratio is the integration function unit 70. Is input to, integrated with the reference pump torque command value 60, and output to the pump torque control solenoid valve 45 as a pump torque command value during high output operation.

The effects of the present embodiment configured as described above will be described.

According to the prior art, in a construction machine such as a hydraulic excavator, when a signal for turning on the active mode switch is received, the product of the pump discharge pressure P and the pump discharge amount Q is higher than a predetermined value in normal operation in the active mode. The equal horsepower curve Ha of PQ is set, and when a signal for turning on the power mode switch and a signal for turning on the work equipment lever switch are received, the pump discharge pressure P and the pump discharge amount Q are set. There is a method in which the product becomes the equal horsepower curve Ha of PQ in the active mode, which is one step higher than the equal horsepower curve Ha of PQ in the active mode, and the force and the working speed at the time of working are increased. However, when working with increased power and speed than usual, it is necessary to set the active mode in advance, so even in situations other than when you actually want to increase power and speed, the equal horsepower of PQ in active mode There is a problem that the work is performed on a curved line, which leads to wasteful fuel consumption and an increase in CO2 emissions. Further, when it is desired to further increase the force and speed, it is necessary to operate the power mode switch each time during the work operation, which is a problem for the operator.

On the other hand, in the present embodiment, a signal path 58a independent of the signal path from the operation lever device 50 is provided, a lever switch 58 provided in the operation lever device 50 is provided, and the controller 49 operates. Operation to increase the output of the hydraulic actuators 23, 32, 34, 36 from the normal operation based on the operation signal output from the operation lever device 50 when the lever switch 58 is operated during the operation of the lever device 50 (operation ( When the output up condition for switching to high output operation) is set and the operation signal output from the operation lever device 50 detected by the pressure sensors 53a and 53b satisfies the output up condition, the hydraulic pump 41 absorbs. Since the variable displacement hydraulic pump 41 driven by the engine 22 or the engine 22 is controlled according to the QQ equihorsepower curve for high output operation so that the horsepower is increased as compared with the normal operation, the operator can control the hydraulic pump 41. While reducing the burden of operation, the force and speed can be appropriately increased only in the work required by the operator.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIG. In this embodiment, only the differences from the first embodiment will be described, and the same members as those in the first embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

In the present embodiment, the engine speed increment value is set instead of the output increase rate of the first embodiment, and the increase in the engine speed is added to the engine speed command value for controlling the engine speed. By adding, it is configured to control the absorption horse speed of the hydraulic pump driven by the engine.

That is, in the present embodiment, the engine speed is increased during high output operation on the setting screens (for example, procedure 2-5 and procedure 3-8) shown in FIGS. 9 and 10 in the first embodiment. The engine speed increment value is set for this.

FIG. 13 is a functional block diagram showing an arithmetic processing function of a control signal output from the controller in the present embodiment to an engine speed control unit (not shown) of the engine.

In FIG. 13, the arithmetic processing function 49c of the controller 49 first calculates the target engine speed, and then calculates the target engine speed command value 60c. Subsequently, when the auto power-up control is invalid, the rotation speed increment value 63c having a value "0" (zero) is selected by the selection unit 65c and input to the addition function unit 70c, so that the target engine rotation speed is input. The command value 60c is output to the engine 22 as it is as an engine speed command value. If the auto power-up control is effective and the output-up condition is not satisfied, the selection units 64c and 65c select the rotation speed increment value 62c having a value of "0" (zero) and the addition function unit. Since it is input to 70c, the target engine speed command value 60c is output as it is as a command value to the engine 22. When the auto power-up control is effective and the output-up condition is satisfied, the engine speed increment value 61c set in the output-up condition setting is selected by the selection units 64c and 65c and input to the addition function unit 70c. Then, the engine speed increment value 61c is integrated with the target engine speed command value 60c and output to the engine 22 as the engine speed command value during high output operation.

Other configurations are the same as in the first embodiment.

Also in the present embodiment configured as described above, the same effect as that of the first embodiment can be obtained.

<Third embodiment>
A third embodiment of the present invention will be described with reference to FIGS. 14 and 15. In this embodiment, only the differences from the first embodiment will be described, and the same members as those in the first embodiment are designated by the same reference numerals in each drawing, and the description thereof will be omitted.

In this embodiment, the output increase condition is set based on the operation amount of the operation lever device detected by the pressure sensor and the detection value from the pressure sensor that detects the discharge pressure of the hydraulic pump. Is.

FIG. 14 is a diagram schematically showing a main part of a hydraulic circuit system according to the present embodiment, together with a related configuration of the present invention.

In FIG. 14, the hydraulic circuit system 40A is a variable displacement hydraulic pump driven by an engine 22 that operates based on a control signal input from a controller 49A that controls the operation of the entire hydraulic excavator 100 via a signal path 22a. The tilt of the hydraulic pump 41 is based on the 41, the fixed capacitance type pilot pump 44 driven by the engine 22, and the pilot pressure (control signal) input from the pilot pump 44 via the pump torque control electromagnetic valve 45. A pump torque control electromagnetic valve that controls a control signal (pilot pressure) input to the regulator 46 based on a regulator 46 that controls an angle (discharge flow rate) and a control signal input from the controller 49A via a signal path 45a. Direction of hydraulic oil supplied from 45 and the hydraulic pump 41 driven by the engine 22 to the hydraulic actuators 11, 23, 32, 34, 36 (represented by the hydraulic actuators 43a and 43b in FIG. 14) and It is provided with a control valve (flow control valve) 42 for controlling the flow rate. Further, a pressure sensor 53c for detecting the discharge pressure of the hydraulic pump 41 is provided in the flow path of the pressure oil supplied from the hydraulic pump 41 to the control valve 42, and the detection result is obtained by the controller 49A via the signal path 53h. Is entered in.

In the present embodiment, in addition to the boom raising operation amount, boom lowering operation amount, arm pulling operation amount, arm pushing operation amount, bucket excavation operation amount, bucket dump operation amount, left turning operation amount, and right turning operation amount. , The case where the output increase condition is set based on the discharge pressure of the hydraulic pump will be described as an example.

FIG. 15 is a diagram showing a specific example of setting an output up condition in the auto power-up control.

In FIG. 15, among the operations targeted in setting the output up condition, the boom raising operation, the arm pulling operation, and the bucket excavation operation are performed, and the operation amount is significantly present (that is, the operation amount is 0 (that is, the operation amount is 0 in advance (that is,). It is a threshold value set near zero) and exceeds the threshold value for determining whether or not the operation lever device 50 is operated in the corresponding direction), and other operations (boom lowering operation, arm pushing operation, The case where the bucket dump operation and the left and right turning operation) are not performed and there is no operation amount (in the case of no operation) and the pump pressure is generated is illustrated. Note that, in FIG. 15, among the operations having no operation amount, the (left and right) turning operation is shown as a representative, and the other operations are not shown.

When the function of the lever switch 58 as a setting switch is enabled, the output up condition is generated by operating the lever switch 58 at a certain point in the state where the operator is operating the actuator shown in FIG. And set. Each operating amount and the discharge pressure of the hydraulic pump when the lever switch 58 is operated in this example are boom raising operation amount = Pi_boom, arm pulling operation amount = Pi_arm, bucket excavation operation amount = Pi_bukect, pump pressure = Pump, and others. Since it is determined that the operation amount of is 0 (zero), the generated output increase conditions are boom raising operation amount ≧ Pi_boom and arm pulling operation amount ≧ Pi_arm, bucket excavation operation amount ≧ Pi_booket, and pump pressure ≧ Pumpum. The operation determined that the operation amount is 0 (zero) and no operation is performed (non-operation) is not included in the output increase condition.

Other configurations are the same as in the first embodiment.

Also in the present embodiment configured as described above, the same effect as that of the first embodiment can be obtained.

Further, since the discharge pressure of the hydraulic pump is applied to the output increase condition, the force and speed can be appropriately increased only in the work required by the operator with higher accuracy.

<Modified example of the third embodiment>
In the third embodiment, the output increase condition is set based on the operation amount of the operation lever device detected by the pressure sensor and the detection value from the pressure sensor that detects the discharge pressure of the hydraulic pump. Although it is configured, it is also conceivable to set the output increase condition based on the pressure other than the discharge pressure of the hydraulic pump.

For example, as shown in FIGS. 16 and 17, in addition to the operation amount of the operation lever device detected by the pressure sensor, the output increase condition is set based on the detection value from the pressure sensor that detects the load pressure of the hydraulic actuator. It may be configured to do so.

FIG. 16 is a diagram schematically showing a main part of the hydraulic circuit system according to the modified example, extracted together with the related configuration of the present invention. In FIG. 16, the flow path of the pressure oil supplied from the control valve 42 of the hydraulic circuit system 40B to the respective hydraulic actuators 23, 32, 34, 36 (in FIG. 16 is represented by the hydraulic actuators 43a, 43b) , Pressure sensors 53d and 53e for detecting the load pressure of the hydraulic actuator 43a are provided, and the detection results are input to the controller 49B via the signal paths 53i and 53j, respectively.

FIG. 17 is a diagram showing a specific example of setting an output up condition in the auto power-up control. In FIG. 17, as in FIG. 15, among the operations targeted in setting the output up condition, the boom raising operation, the arm pulling operation, and the bucket excavation operation are performed, and the operation amount is significantly present. The case where the operation of the above is non-operation and the load pressure of the hydraulic actuator 43a is generated is illustrated. Note that, in FIG. 17, among the operations having no operation amount, the (left and right) turning operation is shown as a representative, and the other operations are not shown.

When the function of the lever switch 58 as a setting switch is enabled, the output up condition is generated by operating the lever switch 58 at a certain point in the state where the operator is operating the actuator shown in FIG. And set. Each operation amount and the discharge pressure of the hydraulic pump when the lever switch 58 is operated in this example are boom raising operation amount = Pi_boom, arm pulling operation amount = Pi_arm, bucket excavation operation amount = Pi_book, actuator pressure = Pact, and others. Since the operation amount of is determined to be 0 (zero), the generated output up conditions are boom raising operation amount ≧ Pi_boom and arm pulling operation amount ≧ Pi_arm, bucket excavation operation amount ≧ Pi_booket, and actuator pressure ≧ Pump. The operation determined that the operation amount is 0 (zero) and no operation is performed (non-operation) is not included in the output increase condition.

In the present modification configured as described above, the same effect as that of the first embodiment can be obtained. Further, since the load pressure of the hydraulic actuator is applied to the output increase condition, the force and speed can be appropriately increased only in the work required by the operator with higher accuracy.

Next, the features of each of the above embodiments will be described.

(1) In the above embodiment, it is driven by a prime mover (for example, engine 22), one or more variable displacement hydraulic pumps 41 driven by the prime mover, and pressure oil discharged from the hydraulic pump. Depending on the amount of operation of one or more hydraulic actuators (eg, boom cylinder 32, arm cylinder 34, bucket cylinder 36, swivel motor 23, and left and right traveling motors 11) and an operating device (eg, operating lever device 50). A flow control valve (for example, a control valve 42) that controls the flow rate of the pressure oil supplied from the hydraulic pump to the one or more hydraulic actuators, and an operation amount that detects an operation signal output from the operation device. The operation of the detection device (for example, pressure sensors 53a and 53b) and the hydraulic pump is performed according to a characteristic line showing the relationship between the discharge pressure and the discharge flow rate in the hydraulic pump so that the absorption horsepower of the hydraulic pump becomes a predetermined value. In a construction machine provided with a controller to be controlled, the controller has a signal path independent of the signal path from the operating device, and includes a setting switch (for example, a lever switch 58) provided in the operating device. Sets the operation timing for switching to the operation of increasing the output of the hydraulic actuator based on the operation signal output from the operation device when the setting switch is operated during the operation of the operation device. The absorption horsepower of the hydraulic pump is increased when it is determined that the operation timing is set by the setting switch based on the operation signal output from the operation device detected by the operation amount detection device. The characteristic line was switched to the output increase characteristic line in which the predetermined output value was increased, and one of the motor and the hydraulic pump was controlled based on the output increase characteristic line.

As a result, while reducing the burden of operation by the operator, the force and speed can be appropriately increased only in the work requested by the operator, and the unnecessary increase in force and work speed during work can be suppressed.

(2) Further, in the above embodiment, in the construction machine of (1), when the controller determines that the operation timing is based on the operation signal output from the operation device, the hydraulic pump of the hydraulic pump The discharge flow rate was increased to increase the absorption horsepower of the hydraulic pump.

(3) Further, in the above embodiment, in the construction machine of (1), when the controller determines that the operation timing is based on the operation signal output from the operation device, the rotation of the prime mover The number was increased to increase the absorption horsepower of the hydraulic pump.

(4) Further, in the above-described embodiment, the construction machine of (1) is provided with a setting device for setting the rate of increase of the absorbed horsepower of the output increase characteristic line with respect to the predetermined value.

(5) Further, in the above embodiment, the construction machine of (1) is provided with a discharge pressure detecting device for detecting the discharge pressure of the hydraulic pump.
The controller sets the operation timing based on the operation signal output from the operation device and the discharge pressure of the hydraulic pump when the setting switch is operated during the operation of the operation device.

As a result, the force and speed can be appropriately increased only in the work required by the operator with higher accuracy.

(6) Further, in the above embodiment, the construction machine of (1) is provided with a supply pressure detecting device for detecting the load pressure of the hydraulic actuator.
The controller sets the operation timing based on the operation signal output from the operation device and the applied pressure of the hydraulic actuator when the setting switch is operated during the operation of the operation device.

As a result, the force and speed can be appropriately increased only in the work required by the operator with higher accuracy.

<Additional notes>
In the above embodiment, a general hydraulic excavator in which a hydraulic pump is driven by a prime mover such as an engine has been described as an example, but a hybrid type hydraulic excavator in which the hydraulic pump is driven by an engine and a motor, and Needless to say, the present invention can be applied to an electric hydraulic excavator or the like in which a hydraulic pump is driven only by a motor.

Further, the present invention is not limited to the above-described embodiment, and includes various modifications and combinations within a range not deviating from the gist thereof. Further, the present invention is not limited to the one including all the configurations described in the above-described embodiment, and includes the one in which a part of the configurations is deleted. Further, each of the above configurations, functions and the like may be realized by designing a part or all of them by, for example, an integrated circuit. Further, each of the above configurations, functions, and the like may be realized by software by the processor interpreting and executing a program that realizes each function.

10 ... lower traveling body, 11 ... traveling motor, 20 ... upper turning body, 21 ... turning frame, 22 ... engine, 23 ... turning motor, 30 ... front device (front work machine), 31 ... boom, 32 ... boom cylinder, 33 ... arm, 34 ... arm cylinder, 35 ... bucket, 36 ... bucket cylinder, 40 ... hydraulic circuit system, 40A ... hydraulic circuit system, 40B ... hydraulic circuit system, 41 ... hydraulic pump, 42 ... control valve (flow control valve) , 42 ... control valve, 43a, 43b ... hydraulic actuator, 44 ... pilot pump, 45 ... pump torque control electromagnetic valve, 46 ... regulator, 49, 49A, 49B ... controller, 49a to 49c ... arithmetic processing function, 50 ... operation lever Device (operation device), 53a, 53b ... Pressure sensor (operation amount detection device), 53c to 53e ... Pressure sensor, 53f to 53j, 55a, 56e, 58a ... Signal path, 55 ... Monitor (display device), 56 ... Operation Switch, 56a, 56b ... Direction indicator button, 56c ... Enter button, 56d ... Cancel button, 57 ... Driver's cab (cab), 58 ... Lever switch (setting switch), 60 ... Reference pump torque command value, 60c ... Target engine rotation Number command value, 61a, 61b ... Output increase rate, 61c ... Engine speed increment value, 62c, 63c ... Speed speed increment value, 64a, 64b, 64c, 65a, 65b, 65c ... Selection unit, 70 ... Integration function unit, 70c ... Addition function unit, 71 ... Maximum value selection function, 100 ... Hydraulic excavator

Claims (6)

The prime mover and
A variable displacement hydraulic pump driven by the prime mover,
A hydraulic actuator driven by the pressure oil discharged from the hydraulic pump and
A flow rate control valve that controls the flow rate of the pressure oil supplied from the hydraulic pump to the hydraulic actuator according to the operation amount of the operating device, and
An operation amount detection device that detects an operation signal output from the operation device,
In a construction machine provided with a controller that controls the operation of the hydraulic pump according to a characteristic line showing the relationship between the discharge pressure and the discharge flow rate in the hydraulic pump so that the absorption horsepower of the hydraulic pump becomes a predetermined value.
The operating device is provided with a setting switch for setting a switching condition for switching to a high output operation that increases the output of the hydraulic actuator as compared with the normal operation.
The controller sets the switching condition based on the operation signal of the operation device detected by the operation amount detection device when the setting switch is turned on, and is detected by the operation amount detection device. When it is determined that the operation signal of the operating device satisfies the switching condition, the characteristic line is switched to the output increasing characteristic line in which the predetermined value is increased so that the absorption horsepower of the hydraulic pump is increased. construction machine and controlling the prime mover or the hydraulic pump based on the output increase characteristic line. In the construction machine according to claim 1,
The controller is a construction machine characterized in that, when it is determined that the operation signal of the operation device satisfies the switching condition, the discharge flow rate of the hydraulic pump is increased to increase the absorption horsepower of the hydraulic pump. In the construction machine according to claim 1,
The controller is a construction machine characterized in that, when it is determined that the operation signal of the operation device satisfies the switching condition, the rotation speed of the prime mover is increased to increase the absorption horsepower of the hydraulic pump. In the construction machine according to claim 1,
A construction machine provided with a setting device for setting an increase rate of the absorption horsepower of the output increase characteristic line with respect to the predetermined value. In the construction machine according to claim 1,
A discharge pressure detecting device for detecting the discharge pressure of the hydraulic pump is provided.
The controller is a construction machine that sets the switching condition based on the operation signal of the operation device and the discharge pressure of the hydraulic pump when the setting switch is operated during the operation of the operation device. In the construction machine according to claim 1,
A supply pressure detecting device for detecting the load pressure of the hydraulic actuator is provided.
The controller is a construction machine that sets the switching condition based on an operation signal of the operation device and an additional pressure of the hydraulic actuator when the setting switch is operated during the operation of the operation device.

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