Work vehicle

Abstract

To provide a useful work vehicle.SOLUTION: A hydraulic shovel 1 (work vehicle) is provided with: an actuator (a travel motor 22, a revolving motor 43, a blade cylinder 23a, a boom cylinder 31a, an arm cylinder 32a, a bucket cylinder 33a) operated by an operator; an operation lever 41b1 operating the actuator; a vibration generation unit 63 arranged on the operation lever 41b1; a control unit 80 for controlling the vibration generation unit 63; and a cut-off lever 41b2 for switching over the actuator between an operable state and an inoperable state. The control unit 80 starts vibration of the vibration generation unit 63 when the actuator is switched over to the operable state with the cut-off lever 41b2, and stops the vibration of the vibration generation unit 63 when the actuator is switched over to the inoperable state with the cut-off lever 41b2.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there are known techniques for warning (notifying) an operator of construction machinery based on the fastening of a seat belt, the lock position of a cutoff lever (gate lock lever), the inclination of the construction machinery, and the like (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-145626 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, an operator who drives and operates a work vehicle such as a construction machine may attempt to stand up from the seat with the engine of the work vehicle running and with the cut-off lever down (without getting off the vehicle) in order to visually check the location of work being performed by the work vehicle. In such a case, continuous notification and persistent warnings to the operator to stay seated will be irritating to the operator who fully understands the reason for the notification and is acting accordingly (in the above example, the operator who stands up from the seat to visually check). As a result, the operator will be less likely to take the above action. In other words, there is a risk that the notification will hinder the operator's actions that are necessary for the work.

[0005] The present invention provides a useful work vehicle. [Means for solving the problem]

[0006] The work vehicle of the present invention includes an actuator operated by an operator, an operating lever for operating the actuator, a vibration generating unit provided on the operating lever, a control unit for controlling the vibration generating unit, and a cut-off lever for switching the actuator between operable and inoperable. The control unit vibrates the vibration generating unit when the actuator is switched to operable by the cut-off lever, and stops vibration of the vibration generating unit when the actuator is switched to inoperable by the cut-off lever. [Brief description of the drawings]

[0007] [Figure 1] 1 is a side view showing a schematic configuration of a hydraulic excavator, which is an example of a work vehicle according to an embodiment of the present invention. [Diagram 2] 2 is a block diagram showing a schematic configuration of an alarm device applied to the hydraulic excavator. FIG. [Diagram 3] 4 is an explanatory diagram showing an example of a display screen of a monitor provided in the notification device. FIG. [Figure 4] FIG. 11 is an explanatory diagram showing another example of the display screen of the monitor. [Diagram 5] FIG. 13 is an explanatory diagram showing an example of a display of an icon that prompts an operator to fasten a seat belt. [Figure 6] FIG. 11 is an explanatory diagram showing another example of the display of the icon. [Figure 7] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 8] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 9] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 10] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 11] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 12] FIG. 13 is an explanatory diagram showing an example of an icon display that prompts the operator to take a seat in the cockpit. [Figure 13] FIG. 11 is an explanatory diagram showing another example of the display of the icon. [Figure 14] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 15] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 16] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 17] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 18] FIG. 11 is an explanatory diagram showing still another example of the display of the icon. [Figure 19] 5 is a flowchart showing an example of an operation of the notification device. [Figure 20] 20 is a timing chart showing detection signals and display switching timings in the operation of FIG. 19. [Figure 21] 10 is a flowchart showing another example of the operation of the notification device. [Figure 22] 22 is a timing chart showing detection signals and display switching timings in the operation of FIG. 21. [Diagram 23] 13 is a timing chart when the display unit displays common visual information to each sensor. [Figure 24] 10 is a flowchart showing still another example of the operation of the notification device. [Diagram 25] 25 is a timing chart showing detection signals and display switching timing in the operation of FIG. 24. [Figure 26] 10 is a flowchart showing still another example of the operation of the notification device. [Figure 27] 27 is a timing chart showing detection signals and display switching timing in the operation of FIG. 26. [Figure 28] FIG. 11 is an explanatory diagram showing an example of a combination of visual information displayed on the display unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention with reference to the drawings. First, an overview of a work vehicle to which a notification device of the present embodiment is applied will be described.

[0009] [1. Work vehicles] 1 is a side view showing a schematic configuration of a hydraulic excavator 1, which is an example of a work vehicle according to this embodiment. The hydraulic excavator 1 includes a lower traveling structure 2, a work machine 3, and an upper rotating structure 4.

[0010] Here, directions in FIG. 1 are defined as follows. First, the direction in which the lower traveling body 2 moves straight is the fore-aft direction, one side of which is the "front" and the other side is the "rear". In FIG. 1, as an example, the traveling motor 22 side with respect to the blade 23 is shown as the "front". Also, the lateral direction perpendicular to the fore-aft direction is the left-right direction. In this case, the left side as seen from the operator (operator) sitting in the cockpit 41a is the "left" and the right side is the "right". Furthermore, the direction of gravity perpendicular to the fore-aft and left-right directions is the up-down direction, and the upstream side of the gravity direction is the "up" and the downstream side is the "down".

[0011] The lower traveling structure 2 includes a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, to move the hydraulic excavator 1 forward and backward. The lower traveling structure 2 is provided with a blade 23 for performing ground leveling work and a blade cylinder 23a. The blade cylinder 23a is a hydraulic cylinder that rotates the blade 23 up and down.

[0012] The work implement 3 includes a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, the arm 32, and the bucket 33, it is possible to perform excavation work of earth and sand, etc. That is, the hydraulic excavator 1 as a work vehicle includes the work implement 3 that performs work.

[0013] The boom 31 is rotated by a boom cylinder 31a. A base end of the boom cylinder 31a is supported on the front part of the upper rotating body 4 and is movable so as to be telescopic. The arm 32 is rotated by an arm cylinder 32a. A base end of the arm cylinder 32a is supported on the tip part of the boom 31 and is movable so as to be telescopic. The bucket 33 is rotated by a bucket cylinder 33a. A base end of the bucket cylinder 33a is supported on the tip part of the arm 32 and is movable so as to be telescopic. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are constituted by hydraulic cylinders.

[0014] The upper rotating body 4 is configured to be rotatable via a swivel bearing (not shown) relative to the lower traveling body 2. A control section 41, a swivel base 42, a swivel motor 43, an engine room 44, etc. are arranged on the upper rotating body 4. The upper rotating body 4 rotates via the swivel bearing by driving the swivel motor 43, which is a hydraulic motor.

[0015] A plurality of hydraulic pumps (not shown) are disposed on the upper rotating body 4. Each hydraulic pump is driven by an engine or an electric motor (not shown) inside the engine room 44. Each hydraulic pump supplies working oil (pressurized oil) to hydraulic motors (e.g., the left and right traveling motors 22, the swing motor 43) and hydraulic cylinders (e.g., the blade cylinder 23a, the boom cylinder 31a, the arm cylinder 32a, the bucket cylinder 33a). The hydraulic motors and hydraulic cylinders that are driven by the supply of working oil from any hydraulic pump are collectively referred to as hydraulic actuators, or simply actuators.

[0016] A control seat 41a is arranged in the control unit 41 in which the operator rides. An operation unit 41b is arranged around the control seat 41a. The operation unit 41b is composed of various levers, switches, buttons, etc. The operator sits in the control seat 41a and operates the operation unit 41b to drive the hydraulic actuator. This enables the lower traveling body 2 to travel, the blade 23 to perform ground leveling work, the work equipment 3 to perform excavation work, the upper rotating body 4 to rotate, etc. In other words, the hydraulic excavator 1 as a work vehicle is provided with the control unit 41 in which the operator rides and in which the operation unit 41b for operating the work equipment 3 is arranged.

[0017] In particular, the various levers constituting the operation unit 41b include a cutoff lever 41b2 in addition to an operation lever 41b1 for driving a hydraulic actuator. The cutoff lever 41b2 is provided in the vicinity of the cockpit 41a so as to be rotatable up and down. When the operator presses down the cutoff lever 41b2, a cutoff sensor 53 (see FIG. 2) described later turns ON, and it becomes possible to operate the operation lever 41b1 to drive a specific actuator. On the other hand, when the operator pulls up the cutoff lever 41b2, the cutoff sensor 53 turns OFF, and the actuator cannot be driven even if the operator operates the operation lever 41b1. When the operator wants to get off the operation unit 41, he pulls up the cutoff lever 41b2 to disable the actuator, and then leaves the cockpit 41a.

[0018] [2. Notification device] The hydraulic excavator 1 as a work vehicle of this embodiment is equipped with an alarm device 100 shown in Fig. 2. Fig. 2 is a block diagram showing a schematic configuration of the alarm device 100. The alarm device 100 is equipped with a detection unit 50, an alarm unit 60, a timing unit 70, a control unit 80, and a storage unit 90.

[0019] (2-1. Detection unit) The detection unit 50 includes various sensors that detect the riding state of the operator on the control unit 41 (see FIG. 1). That is, the notification device 100 includes the detection unit 50 that detects the riding state of the operator.

[0020] The detection unit 50 has a seat belt sensor 51, a seating sensor 52, and a cutoff sensor 53. The seat belt sensor 51 detects whether the operator is wearing a seat belt or not. The seat belt sensor 51 outputs a detection signal that is OFF when the operator is wearing the seat belt and is ON when the operator is not wearing the seat belt. This allows the control unit 80 to determine the wearing state (worn / not worn) of the operator's seat belt based on the detection signal from the seat belt sensor 51.

[0021] The seating sensor 52 detects whether the operator is seated in the pilot's seat 41a. The seating sensor 52 outputs a detection signal that is turned OFF when the operator is seated in the pilot's seat 41a and is turned ON when the operator is not seated in the pilot's seat 41a. This allows the control unit 80 to determine the seating state of the operator (seated / not seated) based on the detection signal from the seating sensor 52.

[0022] The cutoff sensor 53 detects the rotation position of the cutoff lever 41b2 described above. The cutoff sensor 53 outputs a detection signal that is ON when the cutoff lever 41b2 is pressed down (rotated downward) and is OFF when the cutoff lever 41b2 is pulled up (rotated upward). When the cutoff lever 41b2 is pressed down, the actuator is in a driveable state as described above, so it is considered that the operator is seated in the cockpit 41a. On the other hand, when the cutoff lever 41b2 is pulled up, the actuator is in a non-driveable state, so it is considered that the operator has left the cockpit 41a. Therefore, the control unit 80 can determine whether the operator is in the control unit 41 by determining the rotation position of the cutoff lever 41b2 based on the detection signal from the cutoff sensor 53.

[0023] (2-2. Notification Department) The notification unit 60 executes a notification process based on the detection result of the detection unit 50. Here, the notification process refers to alerting the operator by notification. That is, the notification device 100 includes the notification unit 60 that executes a notification process to alert the operator based on the detection result of the detection unit 50. The above notification process can be realized, for example, by displaying, issuing an alarm (generating a sound), generating a vibration, or the like.

[0024] Such notification processes include a first notification process and a second notification process. The first notification process and the second notification process have different notification levels. Here, the notification level refers to the degree to which the operator is urged to pay attention (degree of attention call). For example, a high notification level refers to a high degree to which the operator is urged to pay attention and the necessity of notification is high. On the other hand, a low notification level refers to a low degree to which the operator is urged to pay attention and the necessity of notification is low.

[0025] In this embodiment, the second notification process has a lower notification level than the first notification process, and the degree of warning is lower than that of the first notification process. That is, the notification process executed by the notification unit 60 includes the first notification process and the second notification process having a lower notification level indicating the degree of warning the operator than that of the first notification process.

[0026] The following describes a specific configuration of the notification unit 60. The notification unit 60 has a display unit 61, a notification unit 62, and a vibration generation unit 63.

[0027] <2-2-1.Display section> The display unit 61 has a monitor 61a and a lamp 61b. The monitor 61a is configured, for example, as a liquid crystal display device that displays images, and is disposed near the operator's seat 41a in the control unit 41. For example, the monitor 61a displays various types of information, such as images captured by a camera (not shown) mounted on the hydraulic excavator 1, information related to the operating time, engine speed, etc., as well as information corresponding to the riding state of the operator.

[0028] 3 is an explanatory diagram showing an example of the display screen of the monitor 61a. In the figure, visual information V including an icon V1 and an icon V2 is displayed in the right side area of ​​the display screen. The remaining area of ​​the display screen displays the above-mentioned camera image and various information.

[0029] Icon V1 is visual information displayed as information encouraging the operator to fasten the seat belt when seat belt sensor 51 in Fig. 2 detects that the operator is not fastening the seat belt. Icon V2 is visual information displayed as information encouraging the operator to sit down when seating sensor 52 in Fig. 2 detects that the operator is not seated in cockpit seat 41a. In this way, monitor 61a displays visual information V according to the detection result of detection unit 50 in Fig. 2 in the notification process to alert the operator. From this, it can be said that notification unit 60 has display unit 61, and display unit 61 displays visual information V according to the detection result of detection unit 50 in the notification process.

[0030] FIG. 4 is an explanatory diagram showing another example of the display screen of the monitor 61a. In the figure, a case is shown in which the display of information encouraging the operator to fasten the seat belt and the display of information encouraging the operator to sit in the cockpit 41a are performed by displaying one type of visual information V. For example, when the operator is informed to fasten the seat belt and when the operator is informed to sit in the cockpit 41a, the blinking speed (time interval between turning on and off) of the displayed visual information V is changed or the display color of the visual information V is changed, so that the above two types of notifications can be distinguished by displaying one type of (common) visual information V. Also, for example, when the operator is informed to fasten the seat belt, notifications of different notification levels can be performed by changing the blinking speed of the displayed visual information V or by changing the display color of the visual information V. It is to be noted that the notification process may be performed by using the same visual information V without distinguishing between the above two types of notifications. Details of the display of the visual information V in the notification process will be described later.

[0031] The lamp 61b shown in FIG. 2 is composed of, for example, an LED (light-emitting diode) that emits a plurality of colors. By changing the blinking speed of the emitted light or the color of the emitted light when making a notification to encourage the operator to fasten the seat belt and when making a notification to encourage the operator to sit in the cockpit 41a, the above two types of notifications can be distinguished. Note that the emitted light may be common and notification processing may be performed without distinguishing between the above two types of notifications. Also, for example, when making a notification to encourage the operator to fasten the seat belt, it is possible to make notifications with different notification levels for each of the above two types of notifications by changing the blinking speed of the emitted light or the color of the emitted light.

[0032] <2-2-2. Reporting Department> In the notification process, the alarm unit 62 issues auditory information according to the detection result of the detection unit 50. The alarm unit 62 includes a buzzer 62a that emits sound and an audio output unit 62b that outputs an announcement by voice, that is, a sentence, as an electronic sound. Therefore, the sound emitted by the buzzer 62a and the sound output from the audio output unit 62b constitute the above-mentioned auditory information. For example, when the seat belt sensor 51 detects that the operator is not fastening the seat belt, the alarm unit 62 continuously emits a sound of a certain frequency. On the other hand, when the seating sensor 52 detects that the operator is not seated in the cockpit 41a, the alarm unit 62 intermittently emits a sound of a certain frequency. This allows the operator to easily recognize the detection result of the detection unit 50 (for example, that the operator is not fastening the seat belt or that the operator is not seated) by hearing the above-mentioned sound (auditory information). It is to be noted that the notification process may be performed without distinguishing between the above-mentioned two types of notifications by issuing the same sound.

[0033] Furthermore, even when alerting the operator to fasten his / her seat belt (or when alerting the operator to take a seat in the cockpit 41a), alerts with different alert levels can be made by adjusting the frequency or interval of the sound emitted by the buzzer 62a, or by changing the content of the sound output from the audio output unit 62b.

[0034] <2-2-3. Vibration generating part> The vibration generating unit 63 is composed of a vibrator that vibrates the operation lever 41b1 operated by the operator. Note that the vibration here includes both continuous vibration and sporadic vibration (pressure). The vibration generating unit 63 vibrates the operation lever 41b1 in response to the detection result of the detection unit 50 in the notification process.

[0035] For example, when the seat belt sensor 51 detects that the operator is not wearing a seat belt, the vibration generating unit 63 vibrates the operation lever 41b1 continuously for a predetermined period. On the other hand, when the seating sensor 52 detects that the operator is not seated in the cockpit 41a, the vibration generating unit 63 vibrates the operation lever 41b1 intermittently for a predetermined period. The vibration of the operation lever 41b1 is physically transmitted to the operator even if the operator is not seated in the cockpit 41a as long as the operator is touching the operation lever 41b1. Therefore, the operator can easily recognize the detection result of the detection unit 50 (for example, that the operator is not wearing a seat belt or that the operator is not seated) by the vibration of the operation lever 41b1.

[0036] Furthermore, even when issuing a warning to encourage the operator to fasten his / her seat belt (or to take a seat in the cockpit 41a), warnings of different warning levels can be issued by adjusting the frequency of vibrations generated by the vibration generating unit 63, the interval at which the vibrations occur, etc.

[0037] (2-3. Timekeeping unit, control unit, memory unit) The timing unit 70 measures the notification time during which the notification unit 60 executes the notification process. Such a timing unit 70 is, for example, a timer. That is, the notification device 100 of the present embodiment includes the timing unit 70 that measures the notification time during which the notification unit 60 executes the notification process.

[0038] The control unit 80 controls the operation of each part of the notification device 100 and the hydraulic excavator 1 (see FIG. 1). The control unit 80 is configured with an electronic control unit called an ECU (Electronic Control Unit).

[0039] The storage unit 90 is a memory that stores various information and operation programs of the control unit 80. Such storage unit 90 includes a RAM (Random Access Memory), a ROM (Read Only Memory), a non-volatile memory, and the like.

[0040] [3. Examples of visual information display] Next, a display example of visual information displayed on the monitor 61a of the display unit 61 will be described.

[0041] 5 to 11 show examples of the display of the icon V1 that prompts the operator to fasten the seat belt. Fig. 5 shows the icon V1 in a lit state and in an unlit state. The lighting of the icon V1 prompts the operator to fasten the seat belt.

[0042] FIG. 6 shows the icon V1 displayed with different blinking speeds. The warning level can be changed by changing the lighting speed of the icon V1. In other words, the blinking speed 2, which is faster than the blinking speed 1, which is slower, is more effective at alerting the operator, and therefore the warning level is higher. In other words, the warning level regarding wearing a seat belt can be increased by increasing the lighting speed of the icon V1.

[0043] Even if the blinking speed of the icon V1 is slow, it is more effective in calling the operator's attention than when the icon V1 is constantly lit. Therefore, by blinking the icon V1, the level of notification regarding fastening the seat belt can be increased compared to when the icon V1 is simply lit.

[0044] FIG. 7 shows the icon V1 displayed in different colors (e.g., hues). More specifically, in Illumination 1, the icon V1 is displayed in green, in Illumination 2, the icon V1 is displayed in yellow, and in Illumination 3, the icon V1 is displayed in red. In general, it can be said that displaying the icon in yellow rather than green, and in red rather than yellow, is more effective in alerting the operator, following the colors that represent traffic signals. Therefore, the warning level increases in the order of green, yellow, and red. In other words, by changing the display color of the icon V1, the warning level regarding fastening the seat belt can be changed.

[0045] FIG. 8 shows the state in which the icon V1 is displayed with different brightness (luminance). More specifically, in Illumination 1, the icon V1 is displayed dimly (not completely off), in Illumination 3, the icon V1 is displayed brightly, and in Illumination 2, the icon V1 is displayed with a brightness between Illumination 1 and Illumination 3. The brighter the icon V1, the easier it is for the operator to visually recognize the icon V1, and the greater the effect of alerting the operator. Therefore, it can be said that the warning level increases as the brightness of the icon V1 increases. In other words, by changing the brightness of the icon V1, the warning level regarding fastening a seat belt can be changed.

[0046] In this embodiment, the display color of the icon V1 is changed by changing the hue or brightness, but the display color of the icon V1 may be changed by changing the saturation. Also, the display color of the icon V1 may be changed by simultaneously changing two or more elements of the hue, saturation, and brightness. In other words, the display color of the icon V1 may be adjusted by changing at least one of the hue, saturation, and brightness.

[0047] FIG. 9 shows the state in which the icon V1 is displayed at different sizes. More specifically, in light 1, the icon V1 is displayed small (reduced), in light 3, the icon V1 is displayed large (enlarged), and in light 2, the icon V1 is displayed at a size between light 1 and light 3. The larger the icon V1, the easier it is for the operator to visually recognize the icon V1, and the greater the effect of alerting the operator. Therefore, it can be said that the warning level increases as the size of the icon V1 increases. In other words, the warning level regarding fastening a seat belt can be changed by changing the size of the icon V1.

[0048] FIG. 10 shows the state in which the icon V1 is displayed in different shapes. More specifically, in the light 1, the icon V1 is displayed as an illustration (shape A) of an operator seated and fastening a seat belt, in the light 2, the icon V1 is displayed as an illustration (shape B) of a connecting part of a seat belt, and in the light 3, the icon V1 is displayed as an illustration (shape C) including the characters "SEAT BELT". In the order of the light 1 (shape A), the light 2 (shape B), and the light 3 (shape C), the operator can easily recognize the necessity of fastening the seat belt by looking at the icon V1. From this, it can be said that the effect of calling the operator's attention increases in the order of the light 1 (shape A), the light 2 (shape B), and the light 3 (shape C), and the notification level increases. In other words, by changing the shape of the icon V1, the notification level regarding fastening the seat belt can be changed.

[0049] FIG. 11 shows the state in which the icon V1 is displayed with or without decoration, or with different decorations. More specifically, in light 1, the icon V1 is displayed without decoration, and in lights 2 and 3, the icon V1 is displayed with decoration. In this case, the decorations in lights 2 and 3 are different from each other. In particular, the decoration in light 3 is "!!" (decoration A), which is more conspicuous than the decoration "!" (decoration B) in light 2. Depending on whether or not there is decoration and the addition of different decorations, the effect of calling the operator's attention increases and the notification level increases in the order of light 1 (no decoration), light 2 (decoration A), and light 3 (decoration B). In other words, depending on whether or not there is decoration in the icon V1 and the addition of different decorations, the notification level regarding wearing a seat belt can be changed.

[0050] 12 to 18 show examples of the display of the icon V2 that prompts the operator to take a seat in the cockpit 41a. Fig. 12 shows the icon V2 in a lit state and an unlit state. The lighting of the icon V2 prompts the operator to take a seat.

[0051] FIG. 13 shows the state in which the icon V2 is displayed with different blinking speeds. The notification level can be changed by changing the lighting speed of the icon V2. In other words, the blinking 2 state with a faster blinking speed is more effective at alerting the operator than the blinking 1 state with a slower blinking speed, and therefore the notification level is higher. In other words, the notification level regarding sitting can be increased by increasing the lighting speed of the icon V2.

[0052] Even if the blinking speed of the icon V2 is slow, it is more effective in alerting the operator than when the icon V2 is constantly lit. Therefore, by blinking the icon V2, the level of notification regarding the seating can be increased compared to when the icon V2 is simply lit.

[0053] FIG. 14 shows the icon V2 displayed in different colors (e.g., hues). More specifically, in Illumination 1, the icon V2 is displayed in green, in Illumination 2, the icon V2 is displayed in yellow, and in Illumination 3, the icon V2 is displayed in red. In general, it can be said that displaying the icon V2 in yellow rather than green, and in red rather than yellow, is more effective in alerting the operator, following the colors that represent traffic lights. Therefore, the notification level increases in the order of green, yellow, and red. In other words, the notification level regarding seating can be changed by changing the display color of the icon V2.

[0054] FIG. 15 shows the state in which the icon V2 is displayed with different brightness (luminosity). More specifically, in Illumination 1, the icon V2 is displayed darkly (not completely off), in Illumination 3, the icon V2 is displayed brightly, and in Illumination 2, the icon V2 is displayed with a brightness between Illumination 1 and Illumination 3. The brighter the icon V2, the easier it is for the operator to visually recognize the icon V2, and the greater the effect of alerting the operator. Therefore, it can be said that the notification level increases as the brightness of the icon V2 increases. In other words, the notification level regarding sitting can be changed by changing the brightness of the icon V2.

[0055] In this embodiment, the display color of the icon V2 is changed by changing the hue or brightness, but the display color of the icon V2 may be changed by changing the saturation. Also, the display color of the icon V2 may be changed by simultaneously changing two or more elements of the hue, saturation, and brightness. In other words, the display color of the icon V2 may be adjusted by changing at least one of the hue, saturation, and brightness.

[0056] FIG. 16 shows the state in which the icon V2 is displayed at different sizes. More specifically, in light 1, the icon V2 is displayed small (reduced), in light 3, the icon V2 is displayed large (enlarged), and in light 2, the icon V2 is displayed at a size between light 1 and light 3. The larger the icon V2, the easier it is for the operator to visually recognize the icon V2, and the greater the effect of alerting the operator. Therefore, it can be said that the notification level increases as the size of the icon V2 increases. In other words, the notification level regarding seating can be changed by changing the size of the icon V2.

[0057] FIG. 17 shows the state in which the icon V2 is displayed with different shapes. More specifically, in the light 1, the icon V2 is displayed as an illustration (shape A) of the cockpit 41a seen from the left side, in the light 2, the icon V2 is displayed as an illustration (shape B) of the cockpit 41a seen from the diagonal front, and in the light 3, the icon V2 is displayed as an illustration (shape C) including the characters "SIT DOWN". In the order of the light 1 (shape A), the light 2 (shape B), and the light 3 (shape C), the operator is more likely to recognize the need to sit down when looking at the icon V2. From this, it can be said that the effect of calling the operator's attention increases in the order of the light 1 (shape A), the light 2 (shape B), and the light 3 (shape C), and the notification level increases. In other words, by changing the shape of the icon V2, the notification level regarding sitting down can be changed.

[0058] FIG. 18 shows the state in which the icon V2 is displayed with or without decoration, or with different decorations. More specifically, in light 1, the icon V2 is displayed without decoration, and in lights 2 and 3, the icon V2 is displayed with decoration. In this case, the decorations in lights 2 and 3 are different from each other. In particular, the decoration in light 3 is "!!" (decoration A), which is more conspicuous than the decoration in light 2, "!" (decoration B). Depending on whether or not there is decoration and the addition of different decorations, the effect of calling the operator's attention increases and the notification level increases in the order of light 1 (no decoration), light 2 (decoration A), and light 3 (decoration B). In other words, depending on whether or not there is decoration in the icon V2 and the addition of different decorations, the notification level regarding sitting can be changed.

[0059] It is also possible to display only the icon V1 on the monitor 61a as the visual information V, and change the blinking speed, color (hue, brightness), size, shape, decoration, etc., of the icon V1 in two or more ways. In this way, as shown in Fig. 4, by displaying one type of visual information V (for example, without displaying the icon V2), it is possible to notify the driver to fasten his / her seat belt and to notify the driver to stay seated, and to set different notification levels for each notification. This will be described in detail later (see Fig. 23).

[0060] 4. Notification Processing Operation Next, the operation of the notification process of this embodiment will be described. Fig. 19 is a flowchart showing an example of the operation of the notification device 100 of this embodiment. Fig. 20 is a timing chart showing the detection signal output from the detection unit 50 and the switching timing of the display on the display unit 61 (monitor 61a) in the operation of Fig. 19.

[0061] After the operator gets into the control section 41 and starts the engine of the hydraulic excavator 1, the seating sensor 52 of the detection section 50 detects that the operator is seated in the control seat 41a (S1), the seat belt sensor 51 detects that the seat belt is fastened (S2), and the cutoff sensor 53 detects that the cutoff lever 41b2 is in a position where the actuator can be driven (also referred to here as the "working position") (S3), and then the notification section 60 executes the following notification processing under the control of the control section 80.

[0062] That is, when the seating sensor 52 detects that the operator has stood up from the cockpit seat 41a (not seated) or the seat belt sensor 51 detects that the operator has unfastened the seat belt (not fastened) (S4), and a predetermined time has elapsed since the detection point (S6), the alarm unit 60 executes the first alarm process (S7).

[0063] 20, the notification unit 60 executes the first notification process at time t3, a predetermined time after the seat belt is not fastened and detected at time t1. Specifically, the display unit 61a of the notification unit 60 executes the first notification process by flashing the icon V1 in red (see, for example, "Flash 1" in FIG. 6).

[0064] At time t8, a predetermined time after non-seating is detected at time t6, the notification unit 60 executes the first notification process. Specifically, the display unit 61a of the notification unit 60 executes the first notification process by flashing the icon V2 in red (see, for example, "Flash 1" in FIG. 13).

[0065] 19, the notification unit 60 continues the first notification process until the notification time of the first notification process in S7 has elapsed a predetermined time. Then, when the notification time of the first notification process exceeds the predetermined time (S8), the notification unit 60 executes the second notification process (S9). That is, the notification unit 60 performs the first notification process based on the detection result of the detection unit 50 in S4, and then switches the first notification process to the second notification process. In particular, after performing the first notification process, the notification unit 60 switches the first notification process to the second notification process according to the notification time of the first notification process.

[0066] For example, in FIG. 20, the first notification process started at time t3 is switched to the second notification process at time t5 after a predetermined time has elapsed since time t3. Specifically, the display unit 61a of the notification unit 60 executes the second notification process by lighting the icon V1 in red (see, for example, "Lighting 3" in FIG. 7). Also, in FIG. 20, the first notification process started at time t8 is switched to the second notification process at time t10 after a predetermined time has elapsed since time t8. Specifically, the display unit 61a of the notification unit 60 executes the second notification process by lighting the icon V2 in red (see, for example, "Lighting 3" in FIG. 14). That is, the display unit 61 switches the display state of the visual information V (icons V1 and V2) between the first notification process and the second notification process.

[0067] Thereafter, when the seating sensor 52 detects that the operator is seated in the cockpit 41a and the seat belt sensor 51 detects that the operator has fastened the seat belt (S14), the notification unit 60 ends the second notification process (S15). For example, in Fig. 20, the seat belt sensor 51 detects that the seat belt has been fastened at time t8, so the display unit 61 turns off (hides) the icon V1 at time t8 and ends the second notification process. Similarly, the seating sensor 52 detects that the operator is seated at time t11, so the display unit 61 turns off (hides) the icon V2 at time t11 and ends the second notification process.

[0068] Then, when the cutoff sensor 53 detects that the cutoff lever 41b2 is in a position where the actuator cannot be driven (also referred to as the "non-operating position" here) (S16), the notification unit 60 ends the series of notification processes. On the other hand, when the cutoff sensor 53 does not detect the non-operating position of the cutoff lever 41b2 in S16, the above-mentioned processes from S4 onwards are repeated.

[0069] As described above, the notification unit 60 switches the first notification process to the second notification process after performing the first notification process (S7 to S9). In the second notification process (for example, notification by lighting an icon) the notification level is lower than that in the first notification process (for example, notification by blinking an icon), so the degree of attention given to the operator by the notification is reduced compared to the first notification process. This makes it possible to reduce the annoyance felt by the operator by the notification even if the notification process continues depending on the riding state of the operator. Therefore, it is possible to reduce a situation in which the operator's actions required for work are hindered by the notification. For example, the operator can remove his / her seat belt or stand up from the operator's seat 41a with the engine of the hydraulic excavator 1 running to visually check the work site of the hydraulic excavator 1 without feeling much annoyance caused by the notification.

[0070] Particularly, in this embodiment, the notification unit 60 switches from the first notification process to the second notification process (S7 to S9) in accordance with the notification time of the first notification process measured by the timing unit 70. In this case, after a certain time has elapsed from the first notification process, the second notification process is automatically executed even if there is no instruction to switch the notification process by an operator's operation, as described below, so that convenience can be improved.

[0071] Furthermore, in the notification process, the display unit 61 of the notification unit 60 displays visual information V (icon V1, icon V2) corresponding to the detection result of the detection unit 50 (see FIG. 3). This allows the operator to easily recognize the detection result of the detection unit 50 by looking at the visual information V displayed on the display unit 61. For example, by looking at the visual information V, the operator can easily recognize that it has been detected that the seat belt is not fastened or that the pilot is not seated in the cockpit 41a.

[0072] Furthermore, the display unit 61 switches the display state of the visual information V between the first and second notification processes (see "blinking, lighting" in FIG. 19). This makes it possible to easily differentiate the degree of attention to the operator by the display of the visual information V, that is, the notification level described above, between the first and second notification processes.

[0073] In particular, the display unit 61 displays the visual information V (icons V1 and V2) in a blinking manner in the first notification process, and displays the visual information V (icons V1 and V2) in a lighted manner in the second notification process (see FIG. 19). In this case, in the first notification process, the blinking display of the visual information V relatively increases the level of attention to the operator, making it easier for the operator to recognize the detection result of the detection unit 50. On the other hand, in the second notification process, the lighted display of the visual information V relatively decreases the level of attention to the operator, thereby reducing the annoyance the operator feels due to the notification.

[0074] Furthermore, the detection unit 50 has a seat belt sensor 51 and a seating sensor 52 (see FIG. 2). The display unit 61 displays icons V1 and V2 corresponding to the detection results of the seat belt sensor 51 and the seating sensor 52 (see FIG. 3). That is, the detection unit 50 has a plurality of sensors with different detection targets, and the display unit 61 displays visual information V for each detection result of each sensor. This allows the operator to easily recognize the detection result of each sensor by looking at the visual information V (icons V1, V2). That is, the operator can easily recognize the presence or absence of an alarm for each sensor.

[0075] [5. Display Examples in the First Notification Process and the Second Notification Process] In the above, an example has been described in which the first and second notification processes are differentiated by blinking and lighting the visual information V, but the first and second notification processes may be differentiated by differentiating the color of the displayed visual information V. A specific example will be described below.

[0076] For example, the display unit 61 may display the icon V1 in red in the first notification process (see "Lighting 3" in FIG. 7), and in yellow in the second notification process (see "Lighting 2" in FIG. 7). The display unit 61 may also display the icon V1 in a relatively bright color in the first notification process (see "Lighting 3" in FIG. 8), and in a relatively dark color in the second notification process (see "Lighting 1" in FIG. 8).

[0077] Similarly, the display unit 61 may display the icon V2 in red in the first notification process (see "Lighting 3" in FIG. 14), and in yellow in the second notification process (see "Lighting 2" in FIG. 14). Also, the display unit 61 may display the icon V2 in a relatively bright color in the first notification process (see "Lighting 3" in FIG. 15), and in a relatively dark color in the second notification process (see "Lighting 1" in FIG. 15).

[0078] In other words, in these cases, the display unit 61 displays visual information V in a color different from the visual information V displayed in the first notification process in the second notification process.

[0079] In this way, when the color of the visual information V displayed in the first notification process is different from that in the second notification process, the operator can easily distinguish and recognize the visual information V displayed in the first notification process from the visual information V displayed in the second notification process. In addition, since it is easy to express the difference in notification level by the difference in color (for example, green, yellow, red, etc. in FIG. 7), it is possible to reliably make the notification level different between the first notification process and the second notification process, and reliably realize the second notification process having a lower notification level than the first notification process.

[0080] The first and second notification processes may be made different by changing the form of the displayed visual information V. A specific example will be described below. Here, the form of the visual information V includes the shape, size, and the presence or absence of decoration (addition / removal) of the visual information V.

[0081] For example, the display unit 61 may display the icon V1 largest in the first notification process (see "Lighting 3" in FIG. 9), and display the icon V1 smallest in the second notification process (see "Lighting 1" in FIG. 9). Also, the display unit 61 may display the icon V1 in Lighting 3 (shape C) in FIG. 10 in the first notification process, and display the icon V1 in Lighting 1 (shape A) in FIG. 10 in the second notification process. Furthermore, the display unit 61 may display the icon V1 in Lighting 3 (decoration B) in FIG. 11 in the first notification process, and display the icon V1 in Lighting 1 (no decoration) in FIG. 11 in the second notification process.

[0082] Similarly, the display unit 61 may display the icon V2 largest in the first notification process (see "Lighting 3" in FIG. 16), and may display the icon V2 smallest in the second notification process (see "Lighting 1" in FIG. 16). Also, the display unit 61 may display the icon V2 in Lighting 3 (shape C) in FIG. 17 in the first notification process, and may display the icon V2 in Lighting 1 (shape A) in FIG. 17 in the second notification process. Furthermore, the display unit 61 may display the icon V2 in Lighting 3 (decoration B) in FIG. 18 in the first notification process, and may display the icon V2 in Lighting 1 (no decoration) in FIG. 18 in the second notification process.

[0083] In other words, in these cases, it can be said that the display unit 61 displays visual information V in a form different from the visual information V displayed in the first notification process in the second notification process.

[0084] In this way, when the form (shape, size, presence / absence / type of decoration) of the visual information V displayed in the first notification process is different from that in the second notification process, the operator can easily distinguish and recognize the visual information V displayed in the first notification process from the visual information V displayed in the second notification process. In addition, since it is easy to express the difference in notification level by the difference in form (for example, shapes A to C in FIG. 10), it is possible to reliably differ the notification levels between the first notification process and the second notification process and reliably realize the second notification process having a lower notification level than the first notification process.

[0085] [6. Preliminary Notification] Fig. 21 is a flow chart showing another example of the operation of the notification device 100 of this embodiment. Fig. 22 is a timing chart showing the detection signal output from the detection unit 50 and the switching timing of the display on the display unit 61 (monitor 61a) in the operation of Fig. 21. Fig. 21 differs from the operation shown in Fig. 19 in that the third notification process of S5 is performed before the first notification process of S7 is performed. Only the differences from Figs. 19 and 20 will be described below.

[0086] In S4, when the detection unit 50 detects that the operator is not seated or that the seat belt is not fastened, the notification unit 60 immediately executes the third notification process (S5). That is, the notification unit 60 executes the third notification process as a preliminary notification process before the notification process (the first notification process in S7) based on the detection result of the detection unit 50.

[0087] For example, in Fig. 22, when it is detected that the seat belt is not fastened at time t1, the notification unit 60 executes the third notification process. Specifically, the display unit 61a of the notification unit 60 executes the third notification process by lighting up the icon V1 (see, for example, "Lighting 2" in Fig. 7). Also, when it is detected that the passenger is not seated at time t6, the notification unit 60 executes the third notification process. Specifically, the display unit 61a of the notification unit 60 executes the third notification process by lighting up the icon V2 (see, for example, "Lighting 2" in Fig. 14).

[0088] Then, when a predetermined time has elapsed from the time of detection by the detection unit 50 in S4 (S6), the notification unit 60 executes a first notification process (S7).

[0089] In the first notification process, as described above, the display unit 61 of the notification unit 60 displays the visual information (icons V1 and V2) in a flashing manner. The degree of attention of the operator is higher when the visual information V is displayed in a flashing manner than when it is displayed in a lit manner, and the operator can more easily recognize the visual information V in the latter manner. For this reason, it can be said that the third notification process in which the visual information V is displayed in a flashing manner has a lower notification level than the first notification process in which the visual information V is displayed in a flashing manner.

[0090] As described above, by executing the third notification process at S5 as a preliminary notification process prior to the notification process (first notification process) at S7, the operator can unbuckle his / her seat belt and perform a visual inspection while being aware in advance that there is a risk that the first notification process will be executed in the future, thereby reducing the situation in which the operator is confused by the sudden execution of the first notification process.

[0091] Furthermore, the third notification process has a lower notification level and a lower degree of attention calling than the first notification process, so that it is possible to reduce the situation in which a preliminary notification such as the third notification process causes annoyance to the operator.

[0092] [7. Display of common visual information] 23 shows a timing chart in the case where the visual information V displayed by the display unit 61 in the notification process (first notification process, second notification process) and the preliminary notification process (third notification process) is displayed as visual information (icon) common to each sensor constituting the detection unit 50. For example, in the flowchart shown in FIG. 21, the display unit 61 displays the icon V1 by lighting it in red in the third notification process of S5 (see, for example, "Lighting 3" in FIG. 7), displays the icon V1 by slowly flashing in red in the first notification process of S7 (see, for example, "Flashing 1" in FIG. 6), and displays the icon V1 by lighting it in red in the second notification process of S9 (see, for example, "Lighting 3" in FIG. 7). Here, it is assumed that the second notification process is executed when the detection signal of at least one of the seat belt sensor 51 and the seating sensor 52 is ON (when at least one of the seat belt not fastened and the seat not being seated is detected by the sensor).

[0093] As described above, the detection unit 50 has the seat belt sensor 51 and the seating sensor 52 (see FIG. 2). In this case, the display unit 61 displays the detection results of the seat belt sensor 51 and the seating sensor 52 as common visual information V (e.g., icon V1) (see FIG. 4). That is, the detection unit 50 has a plurality of sensors with different detection targets, and the display unit 61 displays the detection results of each sensor as common visual information V. In this configuration, the detection result (not fastened / not seated) by any of the sensors can be recognized by the operator by displaying a minimum number of pieces of visual information V. Such display of visual information V is very effective when there are certain constraints, such as the display screen of the display unit 61 being small or the display area (space) of the visual information V being limited within the display screen.

[0094] [8. Event Identification] Fig. 24 is a flow chart showing yet another example of the operation of the alarm device 100 of this embodiment. Fig. 25 is a timing chart showing the detection signal output from the detection unit 50 and the switching timing of the display on the display unit 61 (monitor 61a) in the operation of Fig. 24. Fig. 24 differs from the operation shown in Fig. 21 in that, in the second alarm process of S9, when there is an event change, that is, when there is a change in the detection result of each sensor of the detection unit 50, the alarm level of the second alarm process is changed so that the change can be identified. Hereinafter, only the points different from Figs. 21 to 23 will be described.

[0095] After the alarm unit 60 executes the second alarm process in S9, if there is a change in the detection state of the detection unit 50 (S10), the alarm unit 60 changes the alarm level of the second alarm process in accordance with the detection result (S12). Then, the process from S10 onwards is repeated, and if all detection states of the detection unit 50 have changed from detection ON to detection OFF in S13, or if there has been no change in the detection state for a predetermined period of time in S10, the process proceeds to S14 described above.

[0096] For example, from time t5 to time t6 in FIG. 25, the seat belt sensor 51 detects only that the seat belt is not fastened (belt detection ON, seating detection OFF). In this case, the display unit 61 of the notification unit 60 displays a green icon V1 as the visual information V (see "Lighting 1" in FIG. 7). At time t6, when the seating sensor 52 further detects that the driver is not seated (belt detection ON, seating detection ON), the display unit 61 displays a red icon V1 as the visual information V (see "Lighting 3" in FIG. 7). By changing the display color of the icon V1 from green to red, the effect of calling the operator's attention is improved. That is, in this case, the notification level of the second notification process is increased.

[0097] At time t8, when the seat belt sensor 51 detects that the seat belt is fastened (belt detection OFF, seating detection ON), the display unit 61 displays a yellow icon V1 as visual information V (see "Light 2" in FIG. 7). By changing the display color of the icon V1 from red to yellow, the effect of alerting the operator is reduced. In other words, in this case, the notification level of the second notification process is lowered. At time t13, when the seating sensor 52 detects that the person is seated, the detection states of all sensors in the detection unit 50 become detection OFF, and the process proceeds to S14.

[0098] As described above, the notification unit 60 changes the notification level of the second notification process in accordance with the detection result by the detection unit 50. This allows the operator to easily recognize that the detection result by the detection unit 50 has changed by the notification by the second notification process (display of visual information V). In other words, the operator can easily identify the event detected by the detection unit 50 by the notification by the second notification process.

[0099] [9. Notification process when detection status changes] Fig. 26 is a flow chart showing yet another example of the operation of the alarm device 100 of this embodiment. Fig. 27 is a timing chart showing the detection signal output from the detection unit 50 and the switching timing of the display on the display unit 61 (monitor 61a) in the operation of Fig. 26. Fig. 26 differs from the operation shown in Fig. 24 in that, in the second alarm process of S9, if an event change occurs, a fourth alarm process is further executed. Only the differences from Figs. 24 and 25 will be described below.

[0100] After the alarm unit 60 executes the second alarm process in S9, if there is a change in the detection state of the detection unit 50 (S10), the alarm unit 60 executes the fourth alarm process (S11). After that, the alarm unit 60 changes the alarm level of the second alarm process according to the detection result (S12). Then, the process from S10 onwards is repeated, and if all detection states of the detection unit 50 change from detection ON to detection OFF in S13, or if there is no change in the detection state for a predetermined time in S10, the process proceeds to S14 described above.

[0101] For example, from time t5 to t6 in FIG. 27, the seat belt sensor 51 detects only that the seat belt is not fastened (belt detection ON, seating detection OFF). In this case, the display unit 61 of the notification unit 60 displays a green icon V1 as visual information V (see "Lighting 1" in FIG. 7). At time t6, when the seating sensor 52 further detects that the person is not seated (belt detection ON, seating detection ON), the display unit 61 causes the icon V1 to flash rapidly as a fourth notification process (see "Flash 2" in FIG. 6). The rapid flashing of the icon V1 significantly increases the effect of calling the operator's attention. That is, in this case, the fourth notification process significantly increases the notification level.

[0102] After that, at time t7, since there is no change in the detection state of the detection unit 50 from time t6, the display unit 61 displays the red icon V1 as the visual information V as the second notification process (see "Lighting 3" in FIG. 7). As the icon V1 changes from rapid flashing to red display, the notification level drops temporarily, but the notification level is still higher than the second notification process from time t5 to t6.

[0103] At time t8, when the seat belt sensor 51 detects that the seat belt is fastened (belt detection OFF, seating detection ON), the display unit 61 causes the icon V1 to flash again at high speed as the fourth notification process (see "Flash 2" in FIG. 6). The high speed flashing of the icon V1 raises the notification level again.

[0104] After that, at time t9, since there is no change in the detection state of the detection unit 50 from time t8, the display unit 61 displays the yellow icon V1 as the visual information V as the second notification process (see "Lighting 2" in FIG. 7). The notification level drops temporarily as the icon V1 changes from rapid flashing to yellow display, but the notification level is still higher than the second notification process from time t5 to t6. When the seating sensor 52 detects a seated person at time t13, the detection state of each sensor in the detection unit 50 all becomes detection OFF, and the process proceeds to S14.

[0105] As described above, when the detection result by the detection unit 50 changes, the notification unit 60 executes a notification process indicating that the detection result has changed as the fourth notification process. This allows the operator to easily recognize that the detection result by the detection unit 50 has changed by the notification by the fourth notification process.

[0106] In Fig. 27, the notification level of the fourth notification process is higher than the notification level of the first notification process (see the vertical axis of Fig. 27), but may be the same as the notification level of the first notification process. In other words, in this case, it can be said that the notification level of the fourth notification process is equal to or higher than the notification level of the first notification process. By setting the notification level of the fourth notification process in this manner, the operator can reliably recognize that the detection result by the detection unit 50 has changed by the notification by the fourth notification process.

[0107] Fig. 28 shows an example of a combination of visual information V (icon V1) displayed on the display unit 61 in the first to fourth notification processes described above. As shown in the figure, by changing the way in which the visual information V is displayed, it is possible to execute a second notification process having a lower notification level than the first notification process. It is also possible to realize a third notification process having a lower notification level than the first notification process. Furthermore, it is possible to realize a fourth notification process having a notification level equal to or higher than the first notification process.

[0108] As described above, the hydraulic excavator 1 as the work vehicle of this embodiment includes the above-mentioned notification device 100, the work implement 3 shown in Fig. 1, and the control unit 41. This allows the operator to take off his seat belt, stand up from the control seat 41a, and visually check the location of work being performed by the hydraulic excavator 1, even with the engine of the hydraulic excavator 1 running, without feeling any annoyance due to the notification.

[0109] [10. Other] In the present embodiment, an example has been described in which the notification unit 60 switches from the first notification process to the second notification process according to the notification time of the first notification process measured by the timing unit 70, but the switching of the notification process is not limited to such an example. For example, the notification unit 60 may switch the notification process based on an operation by an operator.

[0110] Specifically, the notification unit 60 may switch the first notification process to the second notification process based on a signal (operation signal) generated when the operator operates the operation lever 41a or a switch (not shown), etc. In this case, for example, an operation signal generated by the operation amount of the operation lever 41a, ON / OFF switching of a switch, the volume operation amount of an accelerator dial (not shown) that changes the engine speed, screen switching operation of the monitor 61a, etc. is input to the control unit 80, and the notification process is switched in the notification unit 60 based on a control signal from the control unit 80 corresponding to the above operation signal.

[0111] The notification unit 60 may also switch notification processing based on the amount of movement when the work machine 3 or the like is operated by the operation of the operator. For example, when the work machine 3 is operated by the operation of the operator, a detection signal by an angle sensor or an acceleration sensor (neither of which is shown) provided on the boom 31, the arm 32, or the bucket 33, a detection signal by a pressure sensor (not shown) that detects the pressure of the boom cylinder 31a, the arm cylinder 32a, or the bucket cylinder 33a, or a detection signal by a stroke sensor (not shown) that detects the extension and contraction of the boom cylinder 31a, the arm cylinder 32a, or the bucket cylinder 33a are input to the control unit 80, and the control unit 80 recognizes the amount of movement of the work machine 3 based on these detection signals. A control signal based on the amount of movement is input from the control unit 80 to the notification unit 60, so that the notification unit 60 can switch notification processing based on the amount of movement.

[0112] Alternatively, a changeover switch for switching the notification process may be provided separately, and the operation of this changeover switch may be used as a trigger for the notification unit 60 to switch the notification process. For example, a changeover button capable of switching the notification process may be displayed on the screen of the touch panel monitor 61a, and the notification unit 60 may switch the notification process when the operator presses the changeover button on the screen. Also, a mechanical changeover button may be provided separately from the monitor 61a, and the notification unit 60 may switch the notification process when the operator presses the changeover button.

[0113] Of course, it is also possible to perform notification processing by appropriately combining the configurations, processing, displays, and the like described in this embodiment.

[0114] In this embodiment, the hydraulic excavator 1, which is a construction machine, is used as an example of the work vehicle, but the work vehicle is not limited to the hydraulic excavator and may be other construction machines such as a wheel loader. Also, the work vehicle may be an agricultural machine such as a combine harvester.

[0115] Although the embodiment of the present invention has been described above, the scope of the present invention is not limited to this, and the invention can be expanded or modified without departing from the spirit of the invention. [Industrial Applicability]

[0116] The present invention can be used in, for example, construction machines and agricultural machines. [Explanation of symbols]

[0117] 1. Hydraulic excavator (work vehicle) 3. Work equipment 41 Control Unit 50 Detection unit 60 Notification Department 61 Display section 70 Timing section 100 Notification device V Visual information

Claims

1. an actuator operated by an operator; An operation lever for operating the actuator; a vibration generating unit provided on the operating lever; A control unit that controls the vibration generating unit; a cut-off lever for switching the actuator between operable and inoperable; Equipped with the control unit causes the vibration generating unit to vibrate when the actuator is switched to an operable state by the cutoff lever, and causes the vibration generating unit to stop vibrating when the actuator is switched to an inoperable state by the cutoff lever. Work vehicle.

2. The control unit changes the vibration state of the vibration generating unit over time. A work vehicle according to claim 1.

3. the control unit causes the vibration generating unit to vibrate for a certain period of time, and then stops the vibration of the vibration generating unit, and changes the vibration state of the vibration generating unit for the certain period of time. A work vehicle according to claim 1 or 2.

4. The change in the vibration state of the vibration generating unit is caused by any one of the duration, intermittent time, and frequency of the vibration. A work vehicle according to any one of claims 1 to 3.

5. A detection unit is provided for detecting whether an operator is wearing a seat belt, The control unit stops vibration of the vibration generating unit when the actuator is inoperable and the seat belt is fastened. A work vehicle according to any one of claims 1 to 4.

Images