Excavator and system for excavator

Abstract

The present invention has: an undercarriage (1); an upper rotating body (3) rotatably mounted to the undercarriage (1); a cabin (10) mounted to the upper rotating body (3); a door (10D) provided to the cabin (10); a display device (40) disposed inside the cabin (10); and an operation switch (51) disposed near the door (10D) and spaced away from the display device (40). This shovel (100) is configured to output information stored in the shovel (100) when the operation switch (51) is switched.

Description

Technical Field

[0001] The present disclosure relates to a shovel.

Background Art

[0002] A shovel equipped with a display device for displaying the cumulative operation time of an engine is known (see, for example, Patent Document 1). This shovel is configured to be able to display the cumulative operation time of the engine on the display device together with the control state of the engine, the fuel consumption state, the cooling water temperature, the remaining fuel amount, and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-described shovel is configured such that an operator of the shovel who arrives at the driver's seat can easily visually recognize various information. However, maintenance workers, repair workers, or administrators who perform work outside the cab without sitting in the driver's seat (hereinafter referred to as "maintenance workers, etc.") are not configured to be able to easily visually recognize desired information. Therefore, when maintenance workers, etc. visually recognize desired information stored in a storage device mounted on the shovel, they need to enter the cab and operate the display device. And, in order to visually recognize the information stored in the storage devices mounted on each of a plurality of shovels, it is not efficient to enter the cab and operate the display device for each shovel.

[0005] Therefore, it is desired to make it easier for maintenance workers, etc. to confirm the information stored in the storage device mounted on the shovel.

Means for Solving the Problems

[0006] The excavator according to an embodiment of the present invention includes a lower traveling body, an upper swing body rotatably mounted on the lower traveling body, a cab mounted on the upper swing body, a door provided in the cab, a display device disposed in the cab, and a switch disposed at a position near the door and away from the display device. During power source stop When the switch is switched by a person outside the cab , shi it is configured to output information including information regarding maintenance of the excavator, which is stored in the excavator.

Advantages of the Invention

[0007] By the above means, an excavator is provided that enables a maintenance worker or the like to more easily check the information stored in the storage device mounted on the excavator.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] First, with reference to FIGS. 1 and 2, an excavator 100 as an excavating machine according to an embodiment of the present invention will be described. FIG. 1 is a side view of the excavator 100, and FIG. 2 is a top view of the excavator 100.

[0010] In this embodiment, as shown in FIG. 2, the lower traveling body 1 of the excavator 100 includes a crawler 1C. The crawler 1C is driven by a traveling hydraulic motor 2M mounted on the lower traveling body 1. However, the traveling hydraulic motor 2M may be a traveling motor generator as an electric actuator. Specifically, the crawler 1C includes a left crawler 1CL and a right crawler 1CR. The left crawler 1CL is driven by a left traveling hydraulic motor 2ML, and the right crawler 1CR is driven by a right traveling hydraulic motor 2MR.

[0011] The upper swing body 3 is swingably mounted on the lower traveling body 1 via a swing mechanism 2. The swing mechanism 2 is driven by a swing hydraulic motor 2A mounted on the upper swing body 3. However, the swing hydraulic motor 2A may be a swing motor generator as an electric actuator.

[0012] A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5. The boom 4, the arm 5, and the bucket 6 constitute an excavation attachment, which is an example of an attachment. The boom 4 is driven by a boom cylinder 7, the arm 5 is driven by an arm cylinder 8, and the bucket 6 is driven by a bucket cylinder 9.

[0013] A boom angle sensor S1 is attached to the boom 4, an arm angle sensor S2 is attached to the arm 5, and a bucket angle sensor S3 is attached to the bucket 6.

[0014] The boom angle sensor S1 detects the rotation angle of the boom 4. In this embodiment, the boom angle sensor S1 is an acceleration sensor and can detect the boom angle, which is the rotation angle of the boom 4 with respect to the upper swing body 3. The boom angle becomes the minimum angle, for example, when the boom 4 is lowered to the lowest position, and increases as the boom 4 is raised.

[0015] The arm angle sensor S2 detects the rotation angle of the arm 5. In the present embodiment, the arm angle sensor S2 is an acceleration sensor and can detect the arm angle, which is the rotation angle of the arm 5 with respect to the boom 4. The arm angle, for example, becomes the minimum angle when the arm 5 is closed most, and increases as the arm 5 is opened.

[0016] The bucket angle sensor S3 detects the rotation angle of the bucket 6. In the present embodiment, the bucket angle sensor S3 is an acceleration sensor and can detect the bucket angle, which is the rotation angle of the bucket 6 with respect to the arm 5. The bucket angle, for example, becomes the minimum angle when the bucket 6 is closed most, and increases as the bucket 6 is opened.

[0017] The boom angle sensor S1, the arm angle sensor S2, and the bucket angle sensor S3 may each be a potentiometer using a variable resistor, a stroke sensor that detects the stroke amount of the corresponding hydraulic cylinder, a rotary encoder that detects the rotation angle around the connecting pin, a gyro sensor, or a combination of an acceleration sensor and a gyro sensor, etc.

[0018] The upper swing body 3 is provided with a cabin 10 as a driver's cab and is equipped with a power source such as an engine 11. Further, a controller 30, an object detection device 70, an imaging device 80, an orientation detection device 85, a body tilt sensor S4, a swing angular velocity sensor S5, etc. are attached to the upper swing body 3. Inside the cabin 10, an operation device 26, a display device 40, etc. are provided. In this document, for convenience, the side (+X side) of the upper swing body 3 where the boom 4 is attached is defined as the front side, and the side (-X side) where the counterweight is attached is defined as the rear side.

[0019] The controller 30 is a control device for controlling the excavator 100. In the present embodiment, the controller 30 is configured by a computer including a CPU, a volatile memory device, a non-volatile memory device, and the like. Then, the controller 30 reads out a program corresponding to each function from the non-volatile memory device, loads it into the volatile memory device, and causes the CPU to execute the corresponding process.

[0020] The display device 40 is configured to display various types of information. In the present embodiment, the display device 40 is installed at the right front part inside the cab 10 and is configured to display information regarding at least one of the working conditions and the operating state of the excavator 100. The operator sitting in the driver's seat can perform the work by the excavator 100 while checking the various types of information displayed on the display device 40. The display device 40 may have one or more switches used when controlling the image displayed on the display device 40.

[0021] The object detection device 70 is configured to detect an object existing around the excavator 100. The object detection device 70 may be configured to calculate the distance between the object detection device 70 or the excavator 100 and the recognized object. The object includes, for example, a person, an animal, a vehicle, a construction machine, a building, and a hole. The object detection device 70 is, for example, an ultrasonic sensor, a millimeter-wave radar, a stereo camera, a LIDAR, a distance image sensor, or an infrared sensor. In the present embodiment, the object detection device 70 includes a front sensor 70F attached to the front end of the upper surface of the cab 10, a rear sensor 70B attached to the rear end of the upper surface of the upper swing body 3, a left sensor 70L attached to the left end of the upper surface of the upper swing body 3, and a right sensor 70R attached to the right end of the upper surface of the upper swing body 3.

[0022] The object detection device 70 may be configured to detect a predetermined object within a predetermined area set around the excavator 100. For example, it may be configured to distinguish between a person as a predetermined object and an object other than a person.

[0023] The imaging device 80 is configured to image the surroundings of the excavator 100. The imaging device 80 is, for example, a monocular camera, a stereo camera, a distance image camera, an infrared camera, or a LIDAR, etc. In the present embodiment, the imaging device 80 includes a rear camera 80B attached to the rear end of the upper surface of the upper swing body 3, a left camera 80L attached to the left end of the upper surface of the upper swing body 3, and a right camera 80R attached to the right end of the upper surface of the upper swing body 3. The imaging device 80 may include a front camera.

[0024] The rear camera 80B is arranged adjacent to the rear sensor 70B, the left camera 80L is arranged adjacent to the left sensor 70L, and the right camera 80R is arranged adjacent to the right sensor 70R. The front camera may be arranged adjacent to the front sensor 70F.

[0025] The image captured by the imaging device 80 is displayed on the display device 40 installed in the cab 10. The imaging device 80 may be configured to be able to display a viewpoint conversion image such as an aerial view image on the display device 40. The aerial view image is generated, for example, by synthesizing the images output by the rear camera 80B, the left camera 80L, and the right camera 80R respectively.

[0026] The rear camera 80B, the left camera 80L, and the right camera 80R are all attached to the upper swing body 3 such that the optical axis faces obliquely downward and a part of the upper swing body 3 is included in the imaging range. The imaging range of each of the rear camera 80B, the left camera 80L, and the right camera 80R has a viewing angle of about 180 degrees in a top view, for example.

[0027] The imaging device 80 may function as an object detection device. In this case, the object detection device 70 may be omitted.

[0028] The orientation detection device 85 is configured to detect information regarding the relative relationship between the orientation of the upper slewing body 3 and the orientation of the lower traveling body 1. For example, the orientation detection device 85 may be configured by a combination of a geomagnetic sensor attached to the lower traveling body 1 and a geomagnetic sensor attached to the upper slewing body 3. Alternatively, the orientation detection device 85 may be configured by a combination of a GNSS receiver attached to the lower traveling body 1 and a GNSS receiver attached to the upper slewing body 3. Alternatively, the orientation detection device 85 may be configured by a resolver.

[0029] The machine body inclination sensor S4 is configured to detect the inclination of the excavator 100 with respect to a predetermined plane. In the present embodiment, the machine body inclination sensor S4 is an acceleration sensor that detects the inclination angles of the front-rear axis and the left-right axis of the upper slewing body 3 with respect to the horizontal plane. The machine body inclination sensor S4 may be configured by a combination of an acceleration sensor and a gyro sensor. The front-rear axis and the left-right axis of the upper slewing body 3 are, for example, orthogonal to each other and pass through the excavator center point, which is a point on the slewing axis of the excavator 100.

[0030] The slewing angular velocity sensor S5 is configured to detect the slewing angular velocity of the upper slewing body 3. In the present embodiment, the slewing angular velocity sensor S5 is a gyro sensor. The slewing angular velocity sensor S5 may be a resolver, a rotary encoder, or the like. The slewing angular velocity sensor S5 may detect the slewing speed. The slewing speed may be calculated from the slewing angular velocity.

[0031] Next, with reference to FIG. 3, the basic system mounted on the excavator 100 of FIG. 1 will be described. FIG. 3 shows a configuration example of the basic system mounted on the excavator 100 of FIG. 1. In FIG. 3, the mechanical power transmission line is indicated by a double line, the hydraulic oil line is indicated by a thick solid line, the pilot line is indicated by a broken line, the power supply line is indicated by a thin solid line, and the electric control line is indicated by a one-dot chain line.

[0032] As shown in FIG. 3, the basic system mainly includes an engine 11, a main pump 14, a pilot pump 15, a control valve unit 17, an operating device 26, an operating pressure sensor 29, a controller 30, a switching valve 35, a display device 40, an operation switch 51, a room light 52, a main power supply 71, electrical components 73, an engine control unit 74, an engine speed adjustment dial 75, an output characteristic switching switch 76, and the like.

[0033] The engine 11 is a diesel engine that employs isochronous control to maintain a constant engine speed regardless of the increase or decrease in load. The fuel injection amount, fuel injection timing, boost pressure, etc. in the engine 11 are controlled by the engine control unit 74.

[0034] The output shaft of the engine 11 is connected to the input shafts of the main pump 14 and the pilot pump 15, which serve as hydraulic pumps. The main pump 14 supplies hydraulic oil to the control valve unit 17 via an oil line.

[0035] The control valve unit 17 is a hydraulic control device that controls the hydraulic system of the excavator 100. The control valve unit 17 is connected to hydraulic actuators such as a left travel hydraulic motor 2ML, a right travel hydraulic motor 2MR, a boom cylinder 7, an arm cylinder 8, a bucket cylinder 9, and a swing hydraulic motor 2A.

[0036] Specifically, the control valve unit 17 includes a plurality of spool valves corresponding to each hydraulic actuator. Each spool valve is configured to be displaceable according to the pilot pressure generated by the operating device 26 so that the opening area of the PC port and the opening area of the CT port can be increased or decreased. The PC port is a port that communicates the main pump 14 with the hydraulic actuator. The CT port is a port that communicates the hydraulic actuator with the hydraulic oil tank.

[0037] The operating device 26 includes, for example, a left operating lever, a right operating lever, and a traveling operating device. The traveling operating device includes, for example, a traveling lever and a traveling pedal. In the present embodiment, each of the operating devices 26 is a hydraulic operating device that uses the hydraulic oil discharged by the pilot pump 15, and is connected to the pilot port of the corresponding spool valve in the control valve unit 17 via a pilot line. However, the operating device 26 may be an electric operating device. In this case, the operation amount of the electric operating device is input to the controller 30 as an electric signal. Further, a solenoid valve is disposed between the pilot pump 15 and the pilot port of each spool valve. The solenoid valve is configured to operate in response to an electric signal from the controller 30. With this configuration, when a manual operation using the electric operating device is performed, the controller 30 can control the solenoid valve by an electric signal corresponding to the operation amount to increase or decrease the pilot pressure, thereby moving each spool valve within the control valve unit 17. Note that each spool valve may be configured by an electromagnetic spool valve. In this case, the electromagnetic spool valve operates in response to an electric signal from the controller 30 corresponding to the operation amount of the electric operating device.

[0038] The operation pressure sensor 29 detects the content of the operation on the operating device 26 in the form of pressure. The operation pressure sensor 29 outputs the detected value to the controller 30. However, the content of the operation on the operating device 26 may be detected electrically.

[0039] The switching valve 35 is configured to be able to switch between the effective state and the ineffective state of the operating device 26. The effective state of the operating device 26 means a state in which the operator can operate the hydraulic actuator using the operating device 26. The ineffective state of the operating device 26 means a state in which the operator cannot operate the hydraulic actuator using the operating device 26. In the present embodiment, the switching valve 35 is a gate lock valve as a solenoid valve configured to operate in response to a command from the controller 30. Specifically, the switching valve 35 is disposed in a pilot line connecting the pilot pump 15 and the operating device 26, and is configured to be able to switch between blocking and communicating the pilot line in response to a command from the controller 30. The operating device 26 becomes ineffective, for example, when the gate lock lever D4 is pulled up and the switching valve 35 (gate lock valve) is closed, and becomes effective when the gate lock lever D4 is pushed down and the switching valve 35 (gate lock valve) is opened.

[0040] The ignition switch (not shown) is configured to be able to switch the state of the excavator 100. For example, the ignition switch is configured to be able to switch the state of the excavator 100 between the key-on state and the key-off state. The key-on state is one of the states of the excavator 100, and is realized, for example, when the mechanical key inserted into the key cylinder is rotated to the first position (the position selected during the operation of the engine 11). The key-off state is another one of the states of the excavator 100, and is realized, for example, when the mechanical key inserted into the key cylinder is rotated to the second position (the position where the mechanical key can be removed from the key cylinder), or when the mechanical key is removed from the key cylinder.

[0041] In this embodiment, the ignition switch is a key cylinder type switch. The operator of the excavator 100 can adjust the position of the ignition switch to any one of the OFF position, ACC position (accessory position), ON position, and START position by rotating the mechanical key inserted into the key cylinder. When the position of the ignition switch is in the OFF position, the state of the excavator 100 is in the key-off state. When the position of the ignition switch is in the ACC position, ON position, or START position, the state of the excavator 100 is in the key-on state. The operator can operate the electrical components 73 mounted on the excavator 100 without starting the engine 11 by adjusting the position of the ignition switch to the ACC position or ON position. Also, the operator can start the engine 11 by the starter 11b by adjusting the position of the ignition switch to the START position. Further, the operator can continuously operate the engine 11 by setting the position of the ignition switch to the ON position after starting the engine 11.

[0042] The main power supply 71 is a power supply used in both the key-on state and the key-off state. In this embodiment, the main power supply 71 is a storage battery charged with the electricity generated by the alternator 11a. The main power supply 71 is configured to be able to supply power to electrical loads such as the starter 11b, the controller 30, the display device 40, and the electrical components 73 in the key-on state, and to be able to supply power to the display device 40 in the key-off state. The starter 11b is driven by the power from the main power supply 71 to start the engine 11.

[0043] Specifically, the main power supply 71 is grounded via the power line PL1 and is configured to be connected to the display device 40 via the switch 71a, the power line PL2, and the backup power line PL3. Further, the main power supply 71 is configured to be connected to each of the electrical loads via the switch 71a, the power line PL2, the relay 71b, and the main power line PL4. Additionally, the main power supply 71 is configured to be connected to the relay 71b via the switch 71a, the power line PL2, the switch 71c, and the power line PL5.

[0044] The switch 71a is a switch for disconnecting the electrical load from the main power supply 71. In this embodiment, the switch 71a is installed near the main power supply 71 so that it can be operated by a maintenance worker or the like, and is used by the maintenance worker or the like to disconnect the electrical load from the main power supply 71 during maintenance work. Basically, the switch 71a remains in the conductive state even when it is in the key-off state, except when maintenance work is being performed.

[0045] The relay 71b is configured to be in the conductive state when the switch 71c is in the conductive state and to be in the non-conductive state when the switch 71c is in the non-conductive state.

[0046] The switch 71c is configured to be in the conductive state when the ignition switch is in the ACC position, ON position, or START position and to be in the non-conductive state when the ignition switch is in the OFF position.

[0047] When the switch 71c becomes conductive, the relay 71b receives power supply from the main power supply 71 and operates to become conductive. When the relay 71b becomes conductive, the power line PL2 and the main power line PL4 are connected, and each of the electrical loads receives power supply from the main power supply 71 via the main power line PL4.

[0048] The display device 40 may be connected to the controller 30 via a communication network such as CAN, or may be connected to the controller 30 via a dedicated line. In the present embodiment, the display device 40 is connected to the controller 30 via CAN.

[0049] The display device 40 includes a control unit 40a, an image display unit 41, and an operation unit 42. The control unit 40a controls the image displayed on the image display unit 41. In the present embodiment, the control unit 40a is configured by a computer including a CPU, a volatile storage device, a non-volatile storage device, and the like. In this case, the control unit 40a reads out the program corresponding to each function from the non-volatile storage device and reads it into the volatile storage device, and causes the CPU to execute the corresponding process.

[0050] Specifically, the control unit 40a operates by receiving power supply from the main power supply 71 via the main power line PL4 in the key-on state, and operates by receiving power supply from the main power supply 71 via the backup power line PL3 in the key-off state. In this way, the control unit 40a is configured to be able to switch the operation / stop of the image display unit 41 even when the engine 11 is stopped or when the mechanical key is not inserted into the key cylinder. In the present embodiment, in the key-off state, the control unit 40a operates by receiving power supply from the main power supply 71 via the backup power line PL3, and other devices (electrical loads) such as the controller 30 do not operate by receiving power supply.

[0051] The image display unit 41 is configured to be able to display various images. In the present embodiment, the image display unit 41 is a liquid crystal display, and is configured to be able to display an operation state screen (see FIG. 4) in the key-on state. The operation state screen may include, for example, a captured image captured by at least one of the imaging devices 80. Alternatively, the operation state screen may be a menu screen including a state screen indicating the state of the excavator 100, or a setting screen indicating various settings of the excavator 100.

[0052] The captured image may be, for example, a rear image captured by the rear camera 80B, a left image captured by the left camera 80L, or a right image captured by the right camera 80R. Further, the captured image may be, for example, an overhead image synthesized from the captured images captured by each of the rear camera 80B, the left camera 80L, and the right camera 80R. Further, the captured image may be two or more images selected from the rear image, the left image, the right image, and the overhead image.

[0053] Further, the image display unit 41 is configured to be able to display a non-operating state screen (see FIG. 6) different from the operating state screen in the key-off state. The non-operating state screen may be, for example, a maintenance information screen that displays information regarding the maintenance of the excavator 100. The maintenance information screen may be, for example, a screen that displays information regarding the operating time of the engine 11. The non-operating state screen may be displayed on the image display unit 41 when a predetermined button provided around the image display unit 41 is operated regardless of whether the key is in the on state or the off state.

[0054] Note that the image display unit 41 may be configured to be able to display an abnormal state screen, which is another example of the non-operating state screen, when the CAN communication between the controller 30 and the display device 40 is interrupted in the key-on state. In this case, the abnormal state screen is, for example, a screen that displays information indicating that a CAN communication abnormality has occurred.

[0055] In the present embodiment, the control unit 40a operates the image display unit 41 when a predetermined operating condition is satisfied in the key-off state. That is, the control unit 40a causes power to be supplied from the main power supply 71 to the image display unit 41 via the backup power supply line PL3. As a result, the image display unit 41 can display a non-operating time screen. The predetermined operating condition includes, for example, that the state of the operation switch 51 has changed.

[0056] The operation switch 51 is arranged at a position away from the display device 40 near the door 10D (see FIG. 1) of the cabin 10. In the present embodiment, the operation switch 51 is a door switch that detects that the door 10D has been opened, and is composed of a limit switch. However, the operation switch 51 may be a knob switch as a limit switch that detects that the knob 10N (see FIG. 1) of the door 10D has been operated. Alternatively, the operation switch 51 may be an electrostatic switch that detects that the hand of a maintenance worker or the like has touched the knob 10N. Alternatively, the operation switch 51 may be a non-contact human sensor switch that detects a maintenance worker or the like outside the door 10D. Alternatively, the operation switch 51 may be a push button switch arranged outside the cabin 10 so that a maintenance worker or the like outside the door 10D can operate it without opening the door 10D. Alternatively, the operation switch 51 may be arranged inside the cabin 10 and near the door 10D. Specifically, the operation switch 51 may be arranged as a push button switch on the left console on the left side of the driver's seat. Alternatively, the operation switch 51 may be a combination of the above-mentioned multiple types of switches.

[0057] Alternatively, the operation switch 51 may be configured to detect the approach of a terminal carried by a maintenance worker or the like via short-range wireless communication. The terminal carried by a maintenance worker or the like is, for example, a terminal used in an electronic key system such as a keyless entry system or a smart keyless entry system. Typically, the terminal is an electronic key or a smartphone or the like. In this case, the state of the operation switch 51 installed inside the door 10D of the excavator 100 is configured to switch from an off state to a conductive state when, for example, a terminal carried by a maintenance worker or the like approaches the door 10D.

[0058] Specifically, in the key-off state, when the door 10D is opened, the control unit 40a detects that the state of the operation switch 51 has switched from an off state to a conductive state, and determines that a predetermined operating condition is satisfied.

[0059] When a predetermined stop condition is satisfied in the key-off state, the control unit 40a stops the operation of the image display unit 41. That is, the control unit 40a stops the power supply to the image display unit 41 from the main power supply 71 via the backup power supply line PL3. As a result, the image display unit 41 cannot display the non-operating screen.

[0060] The predetermined stop conditions include, for example, that the state of the operation switch 51 has returned to its original state, or that a predetermined maximum operation time has elapsed after the image display unit 41 is operated. The maximum operation time is, for example, several tens of seconds.

[0061] Specifically, in the key-off state, when the opened door 10D is closed, the control unit 40a detects that the state of the operation switch 51 has changed from the conductive state to the cut-off state, and determines that the predetermined stop condition is satisfied. Alternatively, in the key-off state, when a predetermined maximum operation time has elapsed after the image display unit 41 is operated, the control unit 40a may determine that the predetermined stop condition is satisfied.

[0062] The operation unit 42 is a switch panel including a hardware switch. The operation unit 42 may be a touch panel. In the present embodiment, the operation unit 42 is disposed below the image display unit 41. However, the operation unit 42 may be disposed, for example, on the surface of the operation lever, on the left console on the left side of the driver's seat, or on the right console on the right side of the driver's seat.

[0063] The room light 52 is a lighting device that illuminates the inside of the cabin 10. In this embodiment, the room light 52 is configured to turn on when the door 10D is opened. As described above, the control unit 40a is configured to be able to determine whether or not the door 10D of the cabin 10 has been opened based on the state of the operation switch 51. With this configuration, when the control unit 40a determines that the door 10D has been opened, it can output a control command to the room light 52 to turn on the room light 52. Note that the room light 52 is configured to receive power supply from the main power supply 71 via the backup power supply line PL3 in the key-off state.

[0064] The engine control unit 74 is configured to transmit data regarding the state of the engine 11, such as the coolant temperature, to the controller 30. The regulator 14a of the main pump 14 is configured to transmit data regarding the swash plate tilt angle to the controller 30. The discharge pressure sensor 14b is configured to transmit data regarding the discharge pressure of the main pump 14 to the controller 30. The oil temperature sensor 14c provided in the pipeline between the hydraulic oil tank and the main pump 14 is configured to transmit data regarding the temperature of the hydraulic oil flowing through that pipeline to the controller 30. The operation pressure sensor 29 is configured to transmit data regarding the pilot pressure generated when the operation device 26 is operated to the controller 30. The controller 30 is configured to store this data in a volatile memory device or a non-volatile memory device and be able to transmit it to the display device 40 when necessary.

[0065] The engine speed adjustment dial 75 is a dial for adjusting the engine speed of the engine 11. The engine speed adjustment dial 75 is configured to transmit data regarding the set state of the engine speed to the controller 30. The engine speed adjustment dial 75 is configured to be able to switch the engine speed in four stages: the SP mode, the H mode, the A mode, and the IDLE mode. The SP mode is a speed mode selected when it is desired to prioritize the amount of work, and uses the highest engine speed. The H mode is a speed mode selected when it is desired to balance the amount of work and fuel efficiency, and uses the second highest engine speed. The A mode is a speed mode selected when it is desired to operate the excavator 100 with low noise while prioritizing fuel efficiency, and uses the third highest engine speed. The IDLE mode is a speed mode selected when it is desired to idle the engine 11, and uses the lowest engine speed. The engine 11 is controlled to be constant at the engine speed corresponding to the speed mode set by the engine speed adjustment dial 75. The engine speed adjustment dial 75 is provided with an output characteristic switching switch 76. The operator of the excavator 100 can switch the output characteristics of the excavator 100 by pressing the output characteristic switching switch 76. The output characteristic switching switch 76 may, for example, change the engine output torque diagram when pressed, or may decrease the engine speed at each stage in the engine speed adjustment dial 75 by a predetermined value.

[0066] Next, referring to FIG. 4, the operation state screen will be described. FIG. 4 shows an example of the operation state screen.

[0067] In the key-on state, the image display unit 41 includes a date and time display area 41a, a travel mode display area 41b, an attachment display area 41c, a fuel efficiency display area 41d, an engine control state display area 41e, an engine operation time display area 41f, a coolant water temperature display area 41g, a fuel remaining amount display area 41h, a speed mode display area 41i, a urea water remaining amount display area 41j, an operating oil temperature display area 41k, an air conditioner operation state display area 41m, an image display area 41n, and a menu display area 41p.

[0068] The travel mode display area 41b, the attachment display area 41c, the engine control state display area 41e, the rotation speed mode display area 41i, and the air conditioner operation state display area 41m are areas for displaying setting state information which is information regarding the setting state of the excavator 100. The fuel consumption display area 41d, the engine operation time display area 41f, the coolant water temperature display area 41g, the remaining fuel amount display area 41h, the remaining urea water amount display area 41j, and the operating oil temperature display area 41k are areas for displaying operating state information which is information regarding the operating state of the excavator 100.

[0069] The date and time display area 41a is an area for displaying the current date and time. The travel mode display area 41b is an area for displaying the current travel mode. The attachment display area 41c is an area for displaying an image representing the currently attached attachment. The fuel consumption display area 41d is an area for displaying fuel consumption information calculated by the controller 30. The fuel consumption display area 41d includes an average fuel consumption display area 41d1 for displaying the average fuel consumption for the entire period or the average fuel consumption for a partial period, and an instantaneous fuel consumption display area 41d2 for displaying the instantaneous fuel consumption. The entire period means, for example, the entire period after the excavator 100 is shipped. The partial period means, for example, a period arbitrarily set by the operator.

[0070] The engine control state display area 41e is an area for displaying the control state of the engine 11. The engine operation time display area 41f is an area for displaying information regarding the operation time of the engine 11. The coolant water temperature display area 41g is an area for displaying the current temperature state of the engine coolant water. The remaining fuel amount display area 41h is an area for displaying the remaining amount state of the fuel stored in the fuel tank. The rotation speed mode display area 41i is an area for displaying the current rotation speed mode set by the engine rotation speed adjustment dial 75 as an image. The remaining urea water amount display area 41j is an area for displaying the remaining amount state of the urea water stored in the urea water tank as an image. The operating oil temperature display area 41k is an area for displaying the temperature state of the operating oil in the operating oil tank.

[0071] The air conditioner operation state display area 41m includes an air outlet display area 41m1 that displays the position of the current air outlet, an operation mode display area 41m2 that displays the current operation mode, a temperature display area 41m3 that displays the current set temperature, and an air volume display area 41m4 that displays the current set air volume.

[0072] The image display area 41n is an area that displays the image captured by the imaging device 80. The image display area 41n has a first image display area 41n1 located above and a second image display area 41n2 located below. In the example of FIG. 4, the bird's-eye view image FV is arranged in the first image display area 41n1, and the rear image CBT is arranged in the second image display area 41n2. However, in the image display area 41n, the bird's-eye view image FV may be arranged in the second image display area 41n2, and the rear image CBT may be arranged in the first image display area 41n1. Also, in the example of FIG. 4, the bird's-eye view image FV and the rear image CBT are arranged adjacent to each other vertically, but they may be arranged with a gap.

[0073] The bird's-eye view image FV is a virtual viewpoint image generated by the control unit 40a and is generated based on the images acquired by the rear camera 80B, the left camera 80L, and the right camera 80R respectively. Also, in the central portion of the bird's-eye view image FV, a shovel figure GE corresponding to the shovel 100 is arranged. This is to allow the operator to intuitively grasp the positional relationship between the shovel 100 and the objects existing around the shovel 100. The rear image CBT is an image that shows the space behind the shovel 100 and includes an image GC representing a part of the upper surface of the counterweight. The rear image CBT is a real viewpoint image generated by the control unit 40a and is generated based on the image acquired by the rear camera 80B.

[0074] In the example of FIG. 4, the image display area 41n is a vertically long area, but it may also be a horizontally long area. When the image display area 41n is a horizontally long area, the image display area 41n may include the bird's-eye view image FV as the first image display area 41n1 on the left side and the rear image CBT as the second image display area 41n2 on the right side. In this case, the bird's-eye view image FV may be arranged with a space on the left side of the rear image CBT. Alternatively, the bird's-eye view image FV may be arranged on the right side of the rear image CBT.

[0075] The menu display area 41p has tab areas 41p1 to 41p7. In the example of FIG. 4, the tab areas 41p1 to 41p7 are arranged at the lowermost part of the image display unit 41 with spaces between them left and right. An icon representing the content of related information is displayed in each of the tab areas 41p1 to 41p7.

[0076] A menu detail item icon for displaying menu detail items is displayed in the tab area 41p1. When the tab area 41p1 is selected by the operator, the icons displayed in the tab areas 41p2 to 41p7 are switched to icons associated with the menu detail items.

[0077] An icon for displaying information related to the digital level is displayed in the tab area 41p4. When the tab area 41p4 is selected by the operator, the rear image CBT is switched to the first screen showing information related to the digital level.

[0078] An icon for displaying information related to informatized construction is displayed in the tab area 41p6. When the tab area 41p6 is selected by the operator, the rear image CBT is switched to the second screen showing information related to informatized construction.

[0079] An icon for displaying information related to the crane mode is displayed in the tab area 41p7. When the tab area 41p7 is selected by the operator, the rear image CBT is switched to the third screen showing information related to the crane mode.

[0080] However, any of the menu screens such as the first screen, the second screen, or the third screen may be superimposed on the post-image CBT. Alternatively, the post-image CBT may be reduced so as to leave a space for displaying the menu screen. Alternatively, the overhead image FV may be configured to switch to the menu screen. Alternatively, the menu screen may be superimposed on the overhead image FV. Alternatively, the overhead image FV may be reduced so as to leave a space for displaying the menu screen.

[0081] In the example shown in FIG. 4, no icons are displayed in the tab areas 41p2, 41p3, and 41p5. Therefore, even if the operator operates the tab area 41p2, 41p3, or 41p5, no change occurs in the image displayed on the image display unit 41.

[0082] Note that the icons displayed in the tab areas 41p1 to 41p7 are not limited to the above-described example, and icons for displaying other information may be displayed.

[0083] In the example of FIG. 4, the operation unit 42 is composed of a plurality of button-type switches for the operator to select the tab areas 41p1 to 41p7 and perform setting inputs and the like. Specifically, the operation unit 42 includes seven switches 42a1 to 42a7 arranged in the upper row and seven switches 42b1 to 42b7 arranged in the lower row. The switches 42b1 to 42b7 are arranged below the respective switches 42a1 to 42a7. However, the number, form, and arrangement of the switches of the operation unit 42 are not limited to the above-described example. For example, the operation unit 42 may be in a form in which the functions of a plurality of button-type switches are combined into one, such as a jog wheel or a jog switch. Further, the operation unit 42 may be configured as a member independent of the display device 40. Further, the tab areas 41p1 to 41p7 may be configured as software buttons. In this case, the operator can select an arbitrary tab area by touching the tab areas 41p1 to 41p7.

[0084] In the example of FIG. 4, switch 42a1 is disposed below tab area 41p1 corresponding to tab area 41p1 and functions as a switch for selecting tab area 41p1. The same applies to each of switches 42a2 to 42a7.

[0085] With this configuration, when the operator selects a desired one of tab areas 41p1 to 41p7, the operator can intuitively recognize which of switches 42a1 to 42a7 should be operated.

[0086] Switch 42b1 is a switch for switching the captured image displayed in image display area 41n. Display device 40 is configured such that each time switch 42b1 is operated, the captured image displayed in first image display area 41n1 of image display area 41n is switched in the order of, for example, a rear image, a left image, a right image, and an overhead image. Alternatively, display device 40 may be configured such that each time switch 42b1 is operated, the captured image displayed in second image display area 41n2 of image display area 41n is switched in the order of, for example, a rear image, a left image, a right image, and an overhead image. Alternatively, display device 40 may be configured such that each time switch 42b1 is operated, the captured image displayed in first image display area 41n1 of image display area 41n and the captured image displayed in second image display area 41n2 are swapped.

[0087] In this way, the operator may switch the screen displayed in first image display area 41n1 or second image display area 41n2 by operating switch 42b1 as operation unit 42. Alternatively, the operator may switch the screens displayed in first image display area 41n1 and second image display area 41n2 by operating switch 42b1. Display device 40 may separately include a switch for switching the screen displayed in second image display area 41n2.

[0088] Switches 42b2 and 42b3 are switches for adjusting the air volume of the air conditioner. In the example of Fig. 4, the operation unit 42 is configured such that when switch 42b2 is operated, the air volume of the air conditioner decreases, and when switch 42b3 is operated, the air volume of the air conditioner increases.

[0089] Switch 42b4 is a switch for switching the ON / OFF of the cooling / heating function. In the example of Fig. 4, the operation unit 42 is configured such that the ON / OFF of the cooling / heating function switches each time switch 42b4 is operated.

[0090] Switches 42b5 and 42b6 are switches for adjusting the set temperature of the air conditioner. In the example of Fig. 4, the operation unit 42 is configured such that when switch 42b5 is operated, the set temperature decreases, and when switch 42b6 is operated, the set temperature increases.

[0091] Switch 42b7 is a switch for switching the content of the information regarding the operation time of the engine 11, which is displayed in the engine operation time display area 41f. The information regarding the operation time of the engine 11 includes, for example, the cumulative operation time for the entire period and the cumulative operation time for a partial period.

[0092] Also, switches 42a2 to 42a6 and 42b2 to 42b6 are configured to be able to input the numbers displayed near each switch or the switch. Also, switches 42a3, 42a4, 42a5, and 2b4 are configured to be able to move the cursor left, up, right, and down, respectively, when the cursor is displayed on the image display unit 41.

[0093] Note that the above-described functions given to each of switches 42a1 to 42a7 and 42b1 to 42b7 are examples. Each of switches 42a1 to 42a7 and 42b1 to 42b7 may be configured to be able to execute other functions.

[0094] Next, referring to FIG. 5, an example of a process (hereinafter referred to as "switching process") in which the control unit 40a switches the operation / stop of the image display unit 41 in the key-off state will be described. FIG. 5 is a flowchart of an example of the switching process. The control unit 40a receives power supply from the main power supply 71 (see FIG. 3) via the backup power supply line PL3 in the key-off state, and repeatedly executes this switching process at a predetermined control cycle.

[0095] First, the control unit 40a determines whether the state of the excavator 100 is the key-off state (step ST1). In the present embodiment, the control unit 40a determines whether the state of the excavator 100 is the key-off state based on which power supply line, the backup power supply line PL3 or the main power supply line PL4, it is receiving power supply from. Specifically, when the control unit 40a is receiving power supply via the backup power supply line PL3, it determines that the state of the excavator 100 is the key-off state, and when it is receiving power supply via the main power supply line PL4, it determines that the state of the excavator 100 is not the key-off state.

[0096] If it is determined that the state is not the key-off state (NO in step ST1), the control unit 40a ends the current switching process.

[0097] If it is determined that the state is the key-off state (YES in step ST1), the control unit 40a determines whether the door 10D of the cab 10 is open (step ST2). In the present embodiment, the control unit 40a determines whether the door 10D is open based on the output of the door switch as the operation switch 51.

[0098] If it is determined that the door 10D is not open (NO in step ST2), the control unit 40a ends the current switching process.

[0099] When it is determined that the door 10D is open (YES in step ST2), the control unit 40a activates the image display unit 41 to display information regarding the operating time of the excavator 100 (step ST3). In the present embodiment, the control unit 40a supplies power to the image display unit 41 from the main power supply 71 via the backup power supply line PL3, so that a maintenance information screen as a non-operating state screen (see FIG. 6) is displayed on the image display unit 41.

[0100] Thereafter, the control unit 40a determines whether or not the maximum operating time has elapsed (step ST4). In the present embodiment, the control unit 40a uses the attached timer function to monitor whether or not the elapsed time after activating the image display unit 41 has reached a predetermined maximum operating time. Then, the control unit 40a repeats this determination at a predetermined control cycle until the elapsed time reaches the maximum operating time (NO in step ST4).

[0101] When it is determined that the maximum operating time has elapsed (YES in step ST4), the control unit 40a stops the operation of the image display unit 41 and terminates the display of information regarding the operating time of the excavator 100 (step ST5). In the present embodiment, the control unit 40a stops supplying power to the image display unit 41 from the main power supply 71 via the backup power supply line PL3, so that the display of the maintenance information screen on the image display unit 41 is terminated. As a result, the maintenance information screen displayed on the image display unit 41 disappears regardless of the state of the operation switch 51.

[0102] Through this switching process, maintenance workers and the like can visually check the information regarding the operating time of the excavator 100 displayed on the image display unit 41 simply by opening the door 10D of the cabin 10 without entering the cabin 10. Note that, for example, when performing maintenance on the excavator 100 in accordance with maintenance inspection guidelines or the like, maintenance workers may be required to write the operating time, date, etc. of the excavator 100 on a check sheet. In this case, by visually checking the information regarding the operating time of the excavator 100 displayed on the image display unit 41, the maintenance workers can write the operating time of the excavator 100 on the check sheet without entering the cabin 10 and activating the display device 40.

[0103] In addition, the display device 40 is provided with an image display unit 41 at a position visible from the outside of the door 10D. That is, the image display unit 41 is arranged so as not to be hidden behind the operation lever or the like when viewed by maintenance workers and the like outside the door 10D. Therefore, maintenance workers and the like can visually check the information regarding the operating time of the excavator 100 displayed on the image display unit 41 without taking an awkward posture.

[0104] Further, a glass window 10W (see FIG. 1) is attached to the door 10D. Therefore, maintenance workers and the like can visually check the information regarding the operating time of the excavator 100 displayed on the image display unit 41 through the glass window by simply opening the door 10D slightly without fully opening it.

[0105] Alternatively, when the operation switch 51 is configured to be able to detect the approach of a terminal carried by maintenance workers and the like, maintenance workers and the like can visually check the information regarding the operating time of the excavator 100 displayed on the image display unit 41 through the glass window just by approaching the door 10D. In this case, it is not necessary for maintenance workers and the like to open the door 10D to visually check the information regarding the operating time of the excavator 100 displayed on the image display unit 41.

[0106] Note that the image display unit 41 may be configured not to operate in response to the first switching of the operation switch 51 after the state of the excavator 100 transitions from the key-on state to the key-off state. Alternatively, the image display unit 41 may be configured not to operate until a predetermined operation prohibition time elapses after the state transitions from the key-on state to the key-off state. This is to prevent the image display unit 41 from operating when the operator opens the door 10D to get out of the cab 10 after finishing the operation of the excavator 100.

[0107] Specifically, when the state of the excavator 100 transitions from the key-on state to the key-off state, the power supply to the image display unit 41 is cut off and its operation stops. Therefore, if the image display unit 41 operates when the operator opens the door 10D to get out of the cab 10, the operator may mistakenly think that the operation of the image display unit 41 has not stopped properly. The above-described function can prevent such a misrecognition.

[0108] However, the image display unit 41 may be configured to operate in response to the first switching of the operation switch 51 after the state of the excavator 100 transitions from the key-on state to the key-off state. Also, the image display unit 41 may be configured to operate even immediately after the state transitions from the key-on state to the key-off state. This is to simplify the function by omitting exceptional processing and to suppress or prevent problems such as failures.

[0109] Next, with reference to FIG. 6, the non-operating state screen will be described. FIG. 6 shows an example of the non-operating state screen.

[0110] In the example shown in FIG. 6, the non-operating state screen displayed on the image display unit 41 in the key-off state includes a date and time display area 41a and an engine operation time display area 41f. Specifically, the control unit 40a causes the entire display area of the image display unit 41 to be displayed in black, the cumulative operation time to be displayed in white at the center, and the date and time to be displayed in white at the upper right corner.

[0111] The size of the characters (e.g., numbers) displayed in the engine operation time display area 41f included in the non-operation state screen is larger than the size of the characters displayed in the engine operation time display area 41f included in the operation state screen (see FIG. 4).

[0112] In addition, the non-operation state screen displays all display areas other than the date and time display area 41a and the engine operation time display area 41f in one color (black), and displays the numerical values, symbols, etc. in each of the date and time display area 41a and the engine operation time display area 41f in another color (white). And, the non-operation state screen does not display other information around the engine operation time display area 41f arranged in the center.

[0113] In this way, the non-operation state screen is configured such that even a maintenance worker or the like outside the door 10D can easily view the information regarding the operation time. Therefore, even a maintenance worker or the like outside the door 10D, that is, a maintenance worker or the like who is farther away from the operator sitting in the driver's seat as seen from the display device 40, can easily view (identify) the characters displayed in the engine operation time display area 41f.

[0114] Note that the non-operation state screen may omit the display in the date and time display area 41a. This is to further improve the visibility of the information required by maintenance workers or the like by omitting the display of information other than the information required by maintenance workers or the like (e.g., information regarding the operation time).

[0115] Alternatively, the non-operation state screen may display at least one of information regarding the remaining fuel amount, information regarding the remaining urea water amount, and information regarding errors as information required by maintenance workers or the like. In this case, the information regarding the remaining fuel amount, the information regarding the remaining urea water amount, and the information regarding errors are, for example, information stored in the storage device when the state of the excavator 100 is switched from the most recent key-on state to the current key-off state.

[0116] The non-operating state screen may display information required by the operator of the excavator 100, rather than information required by maintenance workers or the like. Specifically, when the excavator 100 is equipped with an electronic key system such as a keyless entry system or a smart keyless entry system, the non-operating state screen may display information regarding the engine start procedure.

[0117] Next, with reference to FIG. 7, the effects brought about by the excavator 100 provided with the control unit 40a capable of executing the switching process will be described. FIG. 7 is a left side view of the excavator 100, showing a state in which the door 10D is widely opened by a maintenance worker wearing a helmet outside the door 10D.

[0118] As shown in FIG. 7, the display device 40 is disposed between the right pillar 10P and the driver's seat. Specifically, the display device 40 is attached to the right front console 10C in front of the right pillar 10P such that the screen faces the driver's seat side. When the maintenance worker opens the door 10D, the control unit 40a of the display device 40 activates the image display unit 41 to display a non-operating state screen as shown in FIG. 6. With this function, the maintenance worker can visually recognize the operating time of the excavator 100 displayed on the non-operating state screen without entering the cabin 10. The image display unit 41 will not be hidden behind the driver's seat, the operation lever, or the like.

[0119] The maintenance worker may also activate the image display unit 41 to display the non-operating state screen by slightly opening the door 10D. In this case, the maintenance worker can visually recognize the operating time of the excavator 100 displayed on the non-operating state screen through the glass window 10W fitted at the bottom of the door 10D.

[0120] Alternatively, the excavator 100 may be configured to activate the image display unit 41 when a maintenance worker operates the knob 10N of the door 10D or touches the knob 10N. Alternatively, the excavator 100 may be configured to activate the image display unit 41 when a maintenance worker standing immediately outside the door 10D is detected without contact. In these cases, the maintenance worker can visually recognize the operating time of the excavator 100 displayed on the non-operating state screen through the glass window 10W fitted at the lower part of the door 10D as described above.

[0121] As described above, the excavator 100 according to the embodiment of the present invention includes a lower traveling body 1, an upper swing body 3 rotatably mounted on the lower traveling body 1, a cabin 10 serving as a driver's cab mounted on the upper swing body 3, a door 10D provided in the cabin 10, a display device 40 disposed in the cabin 10, and an operation switch 51 which is a switch disposed at a position away from the display device 40 near the door 10D. Then, the excavator 100 is configured to output information stored in a storage device mounted on the excavator 100 when the operation switch 51 is switched. With this configuration, the excavator 100 enables a maintenance worker or the like to more easily confirm the information stored in the storage device.

[0122] Specifically, the excavator 100 can realize a function of presenting information stored in a non-volatile storage device mounted on the excavator 100 to a maintenance worker or the like outside the cabin 10 by activating the image display unit 41 of the display device 40 in the key-off state. Alternatively, the excavator 100 can realize a function of verbally conveying the information stored in the non-volatile storage device to a maintenance worker or the like outside the cabin 10 by activating an audio output device in the key-off state. Therefore, a maintenance worker or the like can acquire the information stored in the non-volatile storage device from outside the cabin 10 without getting into the cabin 10.

[0123] The operation switch 51 is preferably a door switch configured to detect the opening and closing of the door 10D. With this configuration, the control unit 40a can determine whether to operate the image display unit 41 in the key-off state based on the output of the existing door switch used when determining whether to turn on the room light 52. That is, the excavator 100 can realize the above functions without the need to install a new switch.

[0124] The display device 40 is preferably configured to display information regarding the operating time of the engine 11. With this configuration, maintenance workers and the like can check the operating time of the engine 11 without getting into the excavator 100.

[0125] The display device 40 preferably includes an image display unit 41 at a position visible from the outside of the door 10D. And the excavator 100 is preferably configured to operate the image display unit 41 when the operation switch 51 is switched. With this configuration, maintenance workers and the like outside the door 10D can visually recognize the desired information without taking an awkward posture just by opening the door 10D.

[0126] The excavator 100 may be configured to stop the operation of the image display unit 41 when a maximum operation time, which is a predetermined first time, has elapsed after operating the image display unit 41 in response to the opening of the door 10D. With this configuration, the excavator 100 can prevent the image display unit 41 from remaining in the operating state for a long time in the key-off state.

[0127] The image display unit 41 may be configured not to operate in response to the first switching of the operation switch 51 after the state of the excavator 100 transitions from the key-on state to the key-off state. Alternatively, the image display unit 41 may be configured not to operate until a predetermined second time, i.e., an operation prohibition time, elapses after the state of the excavator 100 transitions from the key-on state to the key-off state. With this configuration, the excavator 100 can prevent the image display unit 41 from operating when the operator who has finished operating the excavator 100 opens the door 10D to get out of the cab 10. This is because if the image display unit 41 operates when the operator opens the door 10D to get out of the cab 10, the operator may mistakenly think that the image display unit 41 remains in the operating state.

[0128] The display device 40 is preferably configured to display, on the image display unit 41, a non-operating state screen (see FIG. 6) that is different from the operating state screen (see FIG. 4) displayed on the image display unit when the operation switch 51 is switched, when the key is in the on state.

[0129] And the characters displayed on the non-operating state screen are preferably larger than the characters displayed on the operating state screen. This is because the operating state screen is viewed by the operator sitting in the driver's seat inside the cab 10, while the non-operating state screen is viewed by maintenance workers or the like outside the door 10D.

[0130] Also, the display position of predetermined information on the non-operating state screen is preferably different from the display position of the predetermined information on the operating state screen. For example, the engine operation time display area 41f is arranged in the lower left part of the image display unit 41 in the operating state screen shown in FIG. 4, but is arranged in the central part of the image display unit 41 in the non-operating state screen shown in FIG. 6. This is to enable maintenance workers or the like viewing the non-operating state screen to more reliably view the desired information (information regarding the operation time of the engine 11).

[0131] Also, the number of pieces of information displayed on the non-operating state screen is desirably less than the number of pieces of information displayed on the operating state screen. For example, in the operating state screen shown in FIG. 4, the image display unit 41 includes a date and time display area 41a, a traveling mode display area 41b, an attachment display area 41c, a fuel consumption display area 41d, an engine control state display area 41e, an engine operation time display area 41f, a coolant water temperature display area 41g, a fuel remaining amount display area 41h, a rotation speed mode display area 41i, a urea water remaining amount display area 41j, an operating oil temperature display area 41k, an air conditioner operation state display area 41m, an image display area 41n, and a menu display area 41p. However, in the non-operating state screen shown in FIG. 4, the image display unit 41 includes only the date and time display area 41a and the engine operation time display area 41f. This is to enable a maintenance worker or the like to confirm the desired information (information regarding the operation time of the engine 11) without getting lost. For the same reason, the non-operating state screen desirably does not include an area where a video is displayed, such as the image display area 41n.

[0132] Also, the number of colors used in the non-operating state screen is desirably less than the number of colors used in the operating state screen. For example, while the number of colors used in the operating state screen shown in FIG. 4 is substantially unlimited, the number of colors used in the non-operating state screen shown in FIG. 6 is limited to two colors (black as the background color and white as the character color). This is to improve the visibility of the information required by a maintenance worker or the like.

[0133] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments. Various modifications, substitutions, etc. can be applied to the above-described embodiments without departing from the scope of the present invention. Also, the features described separately can be combined as long as no technical contradiction occurs.

[0134] For example, in the above-described embodiment, the operation / stop of the image display unit 41 in the key-off state is controlled by the control unit 40a that receives power supply from the main power supply 71 via the backup power supply line PL3 in the key-off state. However, the operation / stop of the image display unit 41 in the key-off state may be controlled by other devices (for example, the controller 30 or the imaging device 80, etc.) that receive power supply from the main power supply 71 via the backup power supply line PL3 in the key-off state.

[0135] Also, in the above-described embodiment, the control unit 40a is configured to operate the image display unit 41 when a predetermined operating condition is satisfied. However, the control unit 40a may be configured to operate the sound output device when a predetermined operating condition is satisfied. In this case, the sound output device may be configured to output voice information regarding maintenance, for example, to a maintenance worker or the like outside the cabin 10. Specifically, the sound output device may be configured to output voice information regarding the operation time of the engine 11, for example, to a maintenance worker or the like.

[0136] Also, in the above-described embodiment, the door switch as the operation switch 51 is used when the control unit 40a determines whether to operate the image display unit 41 in the key-off state, and is also used when the control unit 40a determines whether to turn on the room light 52. That is, the operation switch 51 is used to realize two functions. However, the operation switch 51 may be a dedicated switch used only for the control unit 40a to determine whether to operate the image display unit 41 in the key-off state. In this case, the operation switch 51 may be a push button arranged outside the cabin 10.

[0137] This application claims priority based on Japanese Patent Application No. 2019-059334 filed on March 26, 2019, and the entire contents of this Japanese patent application are incorporated herein by reference.

Explanation of Reference Numerals

[0138] 1... Lower traveling body 1C... Crawler 2... Slewing mechanism 2A... Slewing hydraulic motor 2M... Traveling hydraulic motor 3... Upper slewing body 4... Boom 5... Arm 6... Bucket 7... Boom cylinder 8... Arm cylinder 9... Bucket cylinder 10... Cabin 10D... Door 10N... Knob 10W... Glass window 11... Engine 11a... Alternator 11b... Starter 14... Main pump 14a... Regulator 14b... Discharge pressure sensor 14c... Oil temperature sensor 15... Pilot pump 17... Control valve unit 26... Operating device 29... Operating pressure sensor 30... Controller 35... Changeover valve 40... Display device 40a... Control section 41... Image display section 42... Operating section 51... Actuating switch 52... Room light 70... Object detection device 71... Main power supply 71a, 71c... Switches 71b... Relay 73... Electrical components 74... Engine control unit 75... Engine speed adjustment dial 76... Output characteristic changeover switch 80... Imaging device 85... Direction detection device 100... Excavator D4... Gate lock lever S1... Boom angle sensor S2... Arm angle sensor S3... Bucket angle sensor S4... Machine body inclination sensor S5... Slewing angular velocity sensor

Claims

1. A lower traveling body, an upper slewing body rotatably mounted on the lower traveling body, a cab mounted on the upper slewing body, a door provided in the cab, a display device disposed in the cab, and a switch disposed at a position near the door and away from the display device, and configured such that when the switch is switched by a person outside the cab while the power source is stopped, information including information regarding maintenance of the excavator stored in the excavator is output. An excavator.

2. The switch is configured to detect opening and closing of the door. The excavator according to claim 1.

3. The excavator is configured to output information regarding the operating time of the excavator as information stored in the excavator via the display device or a sound output device. The excavator according to claim 1.

4. The display device includes an image display unit at a position visible from the outside of the door. The excavator according to claim 1.

5. The image display unit is configured to operate when the switch is switched. The excavator according to claim 4.

6. The operation of the image display unit is configured to stop when a predetermined first time has elapsed after the image display unit is operated. The excavator according to claim 5.

7. The image display unit is configured not to operate in response to the first switching of the switch after shifting from the key-on state to the key-off state. The excavator according to claim 5.

8. The image display unit is configured not to operate until a predetermined second time has elapsed after shifting from the key-on state to the key-off state. The excavator according to claim 5.

9. When the switch is switched, the display device displays a non-operating state screen different from the operating state screen displayed on the image display unit when in the key-on state on the image display unit. The excavator according to claim 1.

10. The characters displayed on the non-operating state screen are larger than the characters displayed on the operating state screen. The excavator according to claim 9.

11. The display position of predetermined information on the non-operating state screen is different from the display position of the predetermined information on the operating state screen. The excavator according to claim 9.

12. The number of information items displayed on the non-operating state screen is less than the number of information items displayed on the operating state screen. ​ The excavator according to claim 9.

13. The number of colors used in the non-operating state screen is less than the number of colors used in the operating state screen. The excavator according to claim 9.

14. When the switch is switched while the engine is stopped, it is configured to output the information stored in the excavator. The excavator according to claim 1.

15. When the switch is switched, the information stored in the excavator is configured to be output so that a person outside the door can recognize it. The excavator according to claim 1.

16. Until the switch is switched, the display device is inoperative. The excavator according to claim 1.

17. An excavator system having a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, a cab mounted on the upper revolving body, a door provided in the cab, a display device disposed in the cab, and a switch disposed at a position away from the display device in the vicinity of the door, When the switch is switched by a person outside the cab while the power source is stopped, it is configured to output information including information regarding maintenance of the excavator, which is stored in the excavator. An excavator system.

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