JP2018021478A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine for allowing the operation of a hydraulic pump with its output matching to current output characteristics of an engine even in the state that the output of the engine is restricted by an engine controller.SOLUTION: An ECU 17 has an engine side normal operation mode for controlling an engine 12 on the basis of normal output characteristics, and an engine side restricted operation mode for controlling the engine on the basis of restricted output characteristics which keeps the maximum output of the engine 12 further restricted than the normal output characteristics. A main controller 19 has a main side normal operation mode for outputting a command to adjust the capacity of a hydraulic pump 13 on the basis of the normal output characteristics, and a main side restricted operation mode for outputting the command to adjust the capacity of the hydraulic pump 13 on the basis of the restricted output characteristics. When being in the main side normal operation mode despite the engine side restricted operation mode, the main controller 19 changes the current operation mode into the main side restricted operation mode.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a construction machine including an engine, an engine controller that controls driving of the engine, a hydraulic pump that operates by power of the engine, and a main controller that controls driving of the hydraulic pump.

  For example, the construction machine described in Patent Literature 1 adjusts the capacity of an engine, an engine controller that controls the fuel injection amount of the engine, a variable displacement hydraulic pump that is connected to the output shaft of the engine, and the hydraulic pump. And a main controller for outputting a control current for the purpose.

  The engine controller adjusts the engine speed and torque by controlling the fuel injection amount of the engine.

  The main controller outputs an engine rotation command value to the engine controller so as to obtain a target rotational speed corresponding to the current load of the hydraulic pump.

  Further, the main controller outputs a command for adjusting the capacity of the hydraulic pump so as to obtain a target absorption torque (product of the discharge pressure of the hydraulic pump and the capacity of the hydraulic pump) corresponding to the target engine speed. .

JP 2009-74404 A

  In the construction machine described in Patent Document 1, the main controller controls the hydraulic pump based on the target engine speed based on the output characteristics of the engine in a normal state (characteristic indicating the relationship between torque and speed). To do.

  However, in recent years, when the engine is in a special situation (for example, when the construction machine is placed in a low temperature environment), the engine controller sets the output characteristics to the maximum output of the engine for the purpose of protecting the engine. May be changed (to low torque and low rotational speed side).

  In this case, in the construction machine described in Patent Document 1, there is a possibility that the output characteristics of the engine, which is the basis of the control of the main controller, deviate from the output characteristics of the engine controlled by the engine controller based on the actual engine state.

  However, since the main controller cannot recognize that the output characteristics of the engine that is the basis of the control deviate from the output characteristics of the current engine, the main controller must have an appropriate hydraulic pressure that matches the current engine output characteristics. The pump cannot be controlled, and an excessive load may be applied to the engine.

  An object of the present invention is to provide a construction machine capable of operating a hydraulic pump with an output suitable for the current output characteristics of an engine even in a situation where the output of the engine is limited by an engine controller.

  In order to solve the above-described problems, the present invention is a construction machine, which is an engine, an engine controller that controls driving of the engine, a variable displacement hydraulic pump that is operated by power of the engine, and the engine controller. And a main controller that outputs a command for adjusting the capacity of the hydraulic pump based on a preset output characteristic of the engine, and the engine controller outputs the output of the engine. An engine-side normal operation mode for controlling the engine based on a normal output characteristic when a restriction condition set in advance as a condition for limiting is not satisfied, and the normal output characteristic when the restriction condition is satisfied An engine that controls the engine based on a limited output characteristic in which the maximum output of the engine is limited A main operation mode for outputting a command for adjusting the displacement of the hydraulic pump based on the normal output characteristics, and the main controller based on the limit output characteristics. A main-side limited operation mode that outputs a command for adjusting the capacity of the hydraulic pump, and obtains information on the current operation mode from the engine controller, and the acquired operation mode is an engine-side limited operation mode. There is provided a construction machine that changes the current operation mode to the main-side restricted operation mode when the current operation mode in the main controller is set to the main-side normal operation mode.

  According to the present invention, two operation modes (normal operation mode and limited operation mode) are also provided on the main controller side corresponding to the operation mode on the engine controller side.

  Furthermore, when the operation mode on the engine controller side is the restricted operation mode and the operation mode on the main controller side is set to the normal operation mode, the operation mode can be changed to the main side restricted operation mode.

  Accordingly, even in a situation where the engine output is limited by the engine controller, the hydraulic pump can be operated at an output that matches the current output characteristics of the engine.

  The construction machine is a notification device for notifying that the main-side restricted operation mode is set when the operation mode in the main controller is changed from the main-side normal operation mode to the main-side restricted operation mode. Is preferably further provided.

  According to this aspect, it is possible to reliably notify the operator when the mode is changed to the limited operation mode.

  According to the present invention, the hydraulic pump can be operated with an output suitable for the current output characteristics of the engine even in a situation where the engine output is limited by the engine controller.

1 is a side view showing an overall configuration of a hydraulic excavator according to an embodiment of the present invention. It is a circuit diagram which shows the control system provided in the hydraulic shovel shown in FIG. FIG. 3 is a block diagram showing an electrical configuration of a control system shown in FIG. 2. It is a table | surface which shows the operation mode set to ECU and main controller shown in FIG. It is a graph which shows the output characteristic of the engine used in order to control an engine by ECU and main controller which are shown in FIG. FIG. 4 is a graph for explaining the control of the tilt of the hydraulic pump by the main controller shown in FIG. 3, and shows the tilt of the hydraulic pump with respect to the discharge pressure of the hydraulic pump. It is a flowchart which shows the process performed by the main controller shown in FIG. It is a flowchart which shows the process performed by the control part of the display operation apparatus shown in FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are examples embodying the present invention, and are not of a nature that limits the technical scope of the present invention.

  FIG. 1 is a side view showing an overall configuration of a hydraulic excavator 1 as an example of a construction machine according to an embodiment of the present invention.

  Referring to FIG. 1, a hydraulic excavator 1 includes a lower traveling body 2 having a crawler 2 a, an upper revolving body 3 that is turnably provided on the lower traveling body 2, and an attachment 4 that is attached to the upper revolving body 3. And.

  The attachment 4 includes a boom 5 having a base end portion rotatably attached to the upper swing body 3, an arm 6 having a base end portion rotatably attached to the distal end portion of the boom 5, and an arm And a bucket 7 that is rotatably attached to the tip of 6.

  The attachment 4 also includes a boom cylinder 8 that rotates the boom 5 relative to the upper swing body 3, an arm cylinder 9 that rotates the arm 6 relative to the boom 5, and a bucket 7 that rotates relative to the arm 6. And a bucket cylinder 10 that performs.

  Hereinafter, the control system 11 provided in the excavator 1 will be described with reference to FIG.

  The control system 11 includes an engine 12, a variable displacement hydraulic pump 13 that is operated by the power of the engine 12, and hydraulic fluid between the hydraulic pump 13 and a hydraulic actuator (cylinders 8 to 10 are illustrated in FIG. 2). Are provided with a flow control valve 14 for controlling the exchange, a relief valve 15 provided between the flow control valve 14 and the hydraulic pump 13, and a pressure sensor 16 for detecting the discharge pressure of the hydraulic pump 13.

  The flow rate control valve 14 controls the flow rate of hydraulic fluid supplied from the hydraulic pump 13 to the hydraulic actuator, and also controls the flow rate of hydraulic fluid led from the hydraulic actuator to a tank (not shown). In addition, although the cylinders 8 to 10 are illustrated as the hydraulic actuator, the hydraulic actuator includes a turning motor for turning the upper turning body 3, a traveling motor provided in the crawler 2a, and a crusher cylinder not shown. And a breaker, etc., not shown.

  The relief valve 15 is closed when the discharge pressure of the hydraulic pump 13 is less than or equal to a preset relief pressure, while the load on the hydraulic actuator increases and the discharge pressure of the hydraulic pump 13 exceeds the relief pressure. Open.

  The pressure sensor 16 detects the discharge pressure of the hydraulic pump 13 and sends the detection signal to a main controller described later.

  In addition, the control system 11 adjusts the capacity (tilt) of the ECU (Engine Control Unit) 17 that controls the driving of the engine 12, the detection means 18 that is electrically connected to the ECU 17, and the hydraulic pump 13. A regulator 20 for operating, an electromagnetic proportional valve 21 for operating the regulator 20, a pilot pump 22 for supplying hydraulic oil to the regulator 20, the ECU 17 and the electromagnetic proportional valve 21. A main controller 19 and a display operation device 23 electrically connected to the main controller 19 are provided.

  The ECU 17 adjusts the fuel injection amount for the engine 12 by controlling a governor (not shown), and thereby controls the output (rotation speed and torque) of the engine 12. The ECU 17 will be described in detail later.

  The main controller 19 sends a command for adjusting the capacity of the hydraulic pump 13 to the electromagnetic proportional valve 21 based on the output characteristics of the engine (characteristics C1 and C2 in FIG. 5) indicating the relationship between the torque of the engine 12 and the rotational speed. Output. Further, the main controller 19 generates power (power required for the hydraulic pump 13) corresponding to the load of the hydraulic pump 13 based on the output characteristics of the engine (characteristics C1 and C2 in FIG. 5) from the engine 12 to the hydraulic pump 13. A command is output to the ECU 17 so as to be supplied to the ECU 17.

  The electromagnetic proportional valve 21 is energized to a position (upper position in FIG. 2) where the regulator 20 is shut off from the pilot pump 22 in a state where no command is received from the main controller 19. 22 is switched to a position for supplying hydraulic oil to the regulator 20 (lower position in FIG. 2). Further, the electromagnetic proportional valve 21 can adjust the flow rate of the hydraulic oil to the regulator 20 according to the magnitude of the command value (current value) from the main controller 19.

  The regulator 20 is energized so that the rod is contracted in a state where the hydraulic oil is not supplied from the pilot pump 22, and has a cylinder in which the rod extends when the hydraulic oil is supplied from the pilot pump 22.

  Therefore, when no electrical command is input from the main controller 19 to the solenoid of the electromagnetic proportional valve 21, the rod of the cylinder of the regulator 20 is reduced and the displacement (tilt) of the hydraulic pump 13 is minimized. On the other hand, when an electric command is input from the main controller 19 to the solenoid of the electromagnetic proportional valve 21, the cylinder rod of the regulator 20 extends and the capacity of the hydraulic pump 13 increases.

  The ECU 17 determines whether or not a restriction condition set in advance as a condition for restricting the output of the engine 12 is satisfied based on the detection result by the detection means 18. Further, the ECU 17 controls the engine 12 based on the normal output characteristic C1 (see FIG. 5) set in advance when the restriction condition is not satisfied, and when the restriction condition is satisfied. The engine side limited operation mode for controlling the engine 12 based on the limited output characteristic C2 (see FIG. 5) in which the maximum power of the engine 12 is limited more than the normal output characteristic C1. The limited output characteristic C2 is obtained by limiting the maximum rotation speed and the maximum torque with respect to the normal output characteristic C1.

  On the other hand, the main controller 19 outputs the command for adjusting the capacity of the hydraulic pump 13 based on the normal output characteristic C1 to the electromagnetic proportional valve 21 and the hydraulic pressure based on the limited output characteristic C2. And a main-side operation mode for outputting a command for adjusting the capacity of the pump 13 to the electromagnetic proportional valve 21.

  Hereinafter, the normal operation mode and the limited operation mode will be described with reference to FIGS. 4 and 5.

  The ECU 17 and the main controller 19 have one normal operation mode and seven limited operation modes. Further, the main controller 19 can select four modes (H mode, E mode, disassembly mode, and breaker mode) in the state set in the normal operation mode, that is, in the state where the normal output characteristic C1 is selected. it can. The four modes can be selected by operating a display operation device 23 (see FIG. 2) described later.

  The H mode is a mode in which excavation force is prioritized and operated at the maximum output.

  The E mode is a mode in which fuel efficiency is prioritized and operation is performed at an engine speed with good fuel efficiency.

  The dismantling mode is a mode that operates at the maximum output in a state where the hydraulic circuit is switched so as to obtain a flow rate of hydraulic oil suitable for the use of the crusher.

  The breaker mode is a mode that operates at the maximum output in a state in which the hydraulic circuit is switched so as to obtain a flow rate of hydraulic oil suitable for use of the breaker.

  On the other hand, the limited operation mode includes seven operation modes including a low temperature mode, an induction mode, a high altitude mode, an overheat mode, an intake pressure abnormality mode, a boost pressure abnormality mode, and a rotation speed sensor abnormality mode.

  In the low temperature mode, when the temperature around the hydraulic excavator 1 detected by the ambient temperature sensor included in the detection means 18 is lower than a preset temperature, that is, the hydraulic excavator 1 is placed in a predetermined low temperature environment. This is a mode in which the output of the engine 12 is limited in order to protect the engine 12 when the engine is in a limited state (when the restriction condition is satisfied).

  The induction mode is used when the remaining amount of urea water used as a reducing agent for selective catalytic reduction (selective catalytic reduction) in an exhaust gas aftertreatment device (not shown) is less than a preset amount (the restriction condition is satisfied). In some cases, the output of the engine 12 is limited so that the exhaust gas regulation value can be satisfied. The remaining amount of urea water is detected by a remaining amount sensor included in the detecting means 18.

  In the high altitude mode, when the altitude of the excavator 1 detected by the altimeter included in the detecting means 18 is higher than a preset altitude, that is, when the excavator 1 is placed in an environment where the atmospheric pressure is low (restriction condition) This is a mode in which the output of the engine 12 is limited for protection of the engine 12.

  The overheat mode is performed when the temperature of the engine 12 (or its cooling water) detected by the engine temperature sensor included in the detection means 18 is higher than a preset temperature (when the restriction condition is satisfied). In this mode, the output of the engine 12 is limited to protect the engine.

  The intake pressure abnormality mode protects the engine 12 when the intake pressure of the engine 12 detected by the intake pressure sensor included in the detection means 18 is outside a preset normal range (when a restriction condition is satisfied). Therefore, the output of the engine 12 is limited.

  The boost pressure abnormality mode protects the engine 12 when the boost pressure of the engine 12 detected by the boost pressure sensor included in the detecting means 18 is outside a preset normal range (when a restriction condition is satisfied). Therefore, the output of the engine 12 is limited.

  The rotation sensor abnormality mode is the rotation of the engine 12 when the rotation speed of the engine 12 detected by the rotation speed sensor included in the detection means 18 is outside a preset normal range (when a limiting condition is satisfied). In order to prevent inappropriate control of the number, the output of the engine 12 is limited.

  In each of the seven limited operation modes described above, the limited output characteristic C2 is set (FIG. 5 illustrates the limited output characteristic C2 in the low temperature mode). On the other hand, a common limited output characteristic C2 can be set for at least two limited operation modes.

  The main controller 19 acquires information related to the current operation mode from the ECU 17, and sets the operation mode to the main operation mode when the acquired operation mode is set to the main normal operation mode even though the acquired operation mode is the engine-side limited operation mode. Change to side limit operation mode.

  Hereinafter, the electrical configuration of the control system 11 will be described with reference to FIG.

  The ECU 17 determines the operation mode on the ECU 17 side as the engine-side normal operation mode when the restriction condition is not satisfied based on the detection result by the detection means 18, and the restriction condition is satisfied based on the detection result by the detection means 18. In some cases, an operation mode determining unit 17a that determines the operation mode on the ECU 17 side as the engine-side restricted operation mode is provided.

  The main controller 19 includes an engine state determination unit 19a that determines the state of the engine 12, an operation mode determination unit 19b that determines an operation mode on the main controller 19 side based on information acquired from the engine state determination unit 19a, An output value setting unit 19c that generates a command for the electromagnetic proportional valve 21 and the ECU 17 based on the operation mode determined by the determination unit 19b.

  The engine state determination unit 19a determines whether the operation mode on the ECU 17 side is the engine-side normal operation mode or the engine-side limited operation mode based on the information regarding the operation mode acquired from the operation mode determination unit 17a of the ECU 17. To do.

  The operation mode determination unit 19b determines whether the operation mode on the main controller 19 side is the main side normal operation mode or the main side limited operation mode based on the operation mode on the ECU 17 side determined by the engine state determination unit 19a. To do.

  Specifically, the operation mode determination unit 19b changes the operation mode on the main controller 19 side to the main side normal operation when the engine state determination unit 19a inputs that the operation mode on the ECU 17 side is the engine side normal operation mode. Set to mode. On the other hand, the operation mode determination unit 19b changes the operation mode on the main controller 19 side to the main side limited operation mode when the engine state determination unit 19a inputs that the operation mode on the ECU 17 side is the engine side limited operation mode. Set.

  The operation mode on the main controller 19 side determined by the operation mode determination unit 19 b is displayed on the display operation device 23.

  Specifically, the display operation device 23 includes a display unit 23b, a buzzer 23c, a control unit 23a that controls the display unit 23b and the buzzer 23c, and a command input unit 23d. The control unit 23a controls the display unit 23b so that the contents of the main operation mode determined by the operation mode determination unit 19b of the main controller 19 are displayed on the display unit 23b. Further, the control unit 23a activates the buzzer 23c to notify the operator when the main-side operation mode is set to the main-side restricted operation mode by the operation mode determination unit 19b. Specifically, the operation mode determination unit 19b of the main controller 19 sends information related to the operation mode set on the main controller 19 side to the control unit 23a. The control unit 23a displays the contents of the operation mode on the main controller 19 side on the display unit 23b according to the information from the main controller 19, and further displays a buzzer when the operation mode on the main controller 19 side is the limited operation mode. 23c is activated. That is, the display unit 23b and the buzzer 23c notify that the main side limited operation mode is set when the operation mode on the main controller 19 side is changed from the main side normal operation mode to the main side limited operation mode. This corresponds to a notification device.

  The command input unit 23d outputs a command to the main controller 19 indicating that one of the four modes (H mode, E mode, disassembly mode, and breaker mode) included in the main normal operation mode has been selected. Is possible. The control unit 23a controls the display unit 23b to display one of the four modes input by the command input unit 23d when the main-side normal operation mode is set.

  The operation mode determination unit 19b identifies the mode (one of the H mode, E mode, disassembly mode, and breaker mode) input by the command input unit 23d of the display operation device 23, and sends it to the output value setting unit 19c. send.

  The output value setting unit 19c outputs a command value to the ECU 17 and the electromagnetic proportional valve 21 based on the operation mode on the main controller 19 side determined by the operation mode determination unit 19b and the mode input from the display operation device 23. Set the command value to be output for.

  When the operation mode on the main controller 19 side is determined to be the normal operation mode, the output value setting unit 19c sets an output command value for the ECU 17 based on the normal output characteristic C1 shown in FIG. For example, when the H mode, the dismantling mode, or the breaker mode is selected by the display / operation device 23, the output value setting unit 19c can achieve the target rotation at which the output (maximum output) at the rated point P1 on the normal output characteristic C1 is obtained. A command for controlling the number of revolutions of the engine 12 is output to the ECU 17 so as to be a number. On the other hand, when the operation mode on the main controller 19 side is determined to be the normal operation mode and the E mode is selected by the display / operation device 23, the output value setting unit 19c sets the point P3 (inside the normal output characteristic C1 ( A command for controlling the rotational speed of the engine 12 is output to the ECU 17 so as to obtain a target rotational speed at which an output at a fuel efficiency efficiency higher than the rated point P1 is obtained.

  Further, the output value setting unit 19c is an electromagnetic proportional valve based on the equal horsepower line L1 indicated by the solid line in FIG. 6 where the absorption horsepower of the hydraulic pump 13 is constant and the discharge pressure of the hydraulic pump 13 detected by the pressure sensor 16. The target tilt of 21 is specified, and a command for setting the tilt of the electromagnetic proportional valve 21 to the target tilt (command for adjusting the capacity of the hydraulic pump 13) is output to the electromagnetic proportional valve 21. The absorption horsepower of the hydraulic pump 13 defined by the equal horsepower line L1 is set to be equal to or lower than the output of the engine 12 obtained at the rated points P1 and P3.

  On the other hand, when the operation mode on the main controller 19 side is determined to be the limited operation mode, the output value setting unit 19c displays the limited output characteristic C2 shown in FIG. 5 (the limited output characteristic set for the low temperature mode in the example of FIG. 5). The output command value is set based on C2). Specifically, the output setting unit 19c outputs to the ECU 17 a command for controlling the rotational speed of the engine 12 so that the output (maximum output) of the rated point P2 on the limited output characteristic C2 is obtained. In the present embodiment, the rotational speed of the engine 12 is controlled so that the output of the rated point P2 can be obtained even when any of the H mode, E mode, disassembly mode, and breaker mode is selected by the display operation device 23. Command for output. This is to allow a certain work using the hydraulic excavator 1 by maintaining the maximum output in a situation where the output of the engine 12 is limited. Further, in the situation where the main-side limiting operation mode is set, the output value setting unit 19c is detected by the equal horsepower line L2 indicated by the two-dot chain line in FIG. 6 and the pressure sensor 16 where the absorption horsepower of the hydraulic pump 13 is constant. A target tilt of the electromagnetic proportional valve 21 is specified based on the discharge pressure of the hydraulic pump 13 and a command for adjusting the tilt of the electromagnetic proportional valve 21 to the target tilt (to adjust the capacity of the hydraulic pump 13). Is output to the electromagnetic proportional valve 21. The absorption horsepower of the hydraulic pump 13 defined by the equal horsepower line L2 is set to be equal to or less than the output of the engine 12 obtained at the rated point P2.

  In the present embodiment, even when a limited operation mode other than the low temperature mode is set, the rotational speed of the engine 12 is controlled so that the rated point output in the limited output characteristic employed at that time is obtained. Command is output to the ECU 17.

  Hereinafter, the processing executed by the main controller 19 will be described with reference to FIG. It should be noted that the operation mode on the main controller 19 side is set to the normal operation mode before the current process is started.

  When the process by the main controller 19 is started, information on the current operation mode on the ECU 17 side is acquired from the ECU 17 (step S1), and it is determined whether or not the current operation mode is the limited operation mode (step S2). .

  If it is determined that the current operation mode on the ECU 17 side is not the limited operation mode (NO in step S2), the operation mode selected by the command input unit 23d of the display operation device 23 (H mode, E mode, (Disassembly mode or breaker mode) is acquired (step S3).

  Next, the operation mode on the main controller 19 side is set to the main side normal operation mode and the operation mode selected by the display operation device 23 is set (step S4).

  On the other hand, when it is determined in step S2 that the current operation mode on the ECU 17 side is the restricted operation mode, the operation mode on the main controller 19 side is changed from the current normal operation mode to the restricted operation mode (main-side restricted operation mode). Change (step S5). As a result, the current operation mode on the ECU 17 side and the current operation mode on the main controller 19 side can be matched, so that an excessive load due to the operation of the hydraulic pump 13 is prevented from being applied to the engine 12. Can do.

  Next, the operation mode information is transmitted to the control unit 23a of the display operation device 23 (step S6). Specifically, the main controller 19 determines the type of the current operation mode (normal operation mode or limited operation mode) and the mode selected by the display operation device 23 (H mode, E mode, dismantling mode, or breaker mode) is transmitted to the display operating device 23.

  Next, the discharge pressure of the hydraulic pump 13 is acquired from the pressure sensor 16 (step S7), and the target inclination of the hydraulic pump 13 is specified based on the discharge pressure and the equal horsepower line L1 or L2 shown in FIG. A command value (command value for adjusting the capacity of the hydraulic pump 13) for setting the tilt of the hydraulic pump 13 to the target tilt is output to the electromagnetic proportional valve 21 (step S8).

  Next, the rotation speed command value is output to the ECU 17 (step S9). Specifically, when the operation mode on the main controller 19 side is the normal operation mode, a command for setting the output of the engine 12 as the target output is output to the ECU 17 based on the normal output characteristic C1 shown in FIG. On the other hand, when the operation mode on the main controller 19 side is the limited operation mode (low temperature mode in the example of FIG. 5), a command for setting the output of the engine 12 as the target output based on the limited output characteristic C2 shown in FIG. It outputs to ECU17. After execution of step S8, the process by the main controller 19 ends.

  Hereinafter, with reference to FIG. 8, processing executed by the control unit 23 a of the display operation device 23 will be described.

  When the processing starts, first, based on the information about the operation mode sent from the main controller 19 (step S6 in FIG. 7), it is determined whether or not the operation mode on the main controller 19 side is the limited operation mode ( Step T1).

  If it is determined in step T1 that the operation mode is the limited operation mode (YES in step T1), the display unit 23b displays that the operation mode on the main controller 19 side is the limited operation mode, and the buzzer 23c is operated to operate the operator. (Step T2).

  On the other hand, if it is determined in step T1 that the operation mode is the normal operation mode (NO in step T1), the operation mode on the main controller 19 side is the normal operation mode and the mode selected by the display operation device 23 (H mode, (E mode, dismantling mode, or breaker mode) is displayed on the display unit 23b (step T3).

  After step T2 or T3, the process ends.

  As described above, two operation modes (normal operation mode and limited operation mode) are also provided on the main controller 19 side corresponding to the operation mode on the ECU 17 side.

  Therefore, when the operation mode on the ECU 17 side is the limited operation mode and the operation mode on the main controller 19 side is set to the normal operation mode, the operation mode can be changed to the main side limited operation mode.

  Therefore, even in a situation where the output of the engine 12 is restricted by the ECU 17, the hydraulic pump 13 can be operated with an output corresponding to the current output characteristics of the engine 12.

  Moreover, according to the said embodiment, when changing to a restriction | limiting operation mode, that can be reliably notified to an operator.

  In addition, this invention is not limited to the said embodiment, For example, the following aspects can also be employ | adopted.

  Although seven limiting operation modes (see FIG. 4) are illustrated as the limiting operation mode, it is sufficient that at least one limiting operation mode is set for the excavator 1. On the other hand, although one normal operation mode is illustrated as the normal operation mode, it is sufficient that at least one normal operation mode is set in the hydraulic excavator 1.

  However, the maximum output of all the limited output characteristics used in at least one limited operation mode needs to be more limited than the maximum output of all the normal output characteristics used in at least one normal operation mode.

  Further, the type of the limited operation mode is not limited to that shown in FIG.

  Although the detection means 18 including the ambient temperature sensor, the remaining amount sensor, the altimeter, the engine temperature sensor, the intake pressure sensor, the boost pressure sensor, and the rotation speed sensor is illustrated, the detection means 18 includes only a part of the above. It may be included and may include things other than those described above, and may further include only those other than those described above.

  The construction machine is not limited to an excavator, and may be a crane and a dismantling machine, or may be a hybrid construction machine.

C1 Normal output characteristics C2 Limited output characteristics 1 Hydraulic excavator (an example of construction machinery)
12 Engine 13 Hydraulic pump 17 ECU (an example of an engine controller)
19 Main controller 23b Display unit (an example of a notification device)
23c buzzer (an example of a notification device)

Claims (2)

A construction machine,
Engine,
An engine controller for controlling the driving of the engine;
A variable displacement hydraulic pump that operates by the power of the engine;
A main controller that is electrically connected to the engine controller and outputs a command for adjusting the capacity of the hydraulic pump based on a preset output characteristic of the engine;
The engine controller includes an engine-side normal operation mode for controlling the engine based on normal output characteristics when a restriction condition set in advance as a condition for restricting the engine output is not satisfied, and the restriction condition is An engine-side limited operation mode for controlling the engine based on a limited output characteristic in which the maximum output of the engine is limited rather than the normal output characteristic when established,
The main controller outputs a command for adjusting the capacity of the hydraulic pump based on the normal output characteristics, and a main-side normal operation mode for adjusting the capacity of the hydraulic pump based on the limited output characteristics A main-side limited operation mode that outputs a command, obtains information on the current operation mode from the engine controller, and the main controller in the main controller even though the acquired operation mode is the engine-side limited operation mode A construction machine that changes a current operation mode to a main-side restricted operation mode when the current operation mode is set to a main-side normal operation mode.   The construction machine according to claim 1, wherein when the operation mode in the main controller is changed from the main-side normal operation mode to the main-side restriction operation mode, the main-side restriction operation mode is set. A construction machine further comprising a notification device for performing the operation.

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