Display system for work vehicle and display method for work vehicle

Abstract

A display system 90 of a wheel loader 1 comprises: a display device for displaying information pertaining to the wheel loader 1 as a display item; a jog dial 30 capable of receiving an operation of selecting a display item; and a display controller 80 for controlling display on a display device 23. When a display item is selected by the jog dial 30, the display controller 80 displays an icon image corresponding to the display item on a screen after selection, and when the selected display item has a hierarchy, the display controller displays an icon image corresponding to the selected display item and an icon image corresponding to a display item in a hierarchy higher than the selected display item.

Description

Work vehicle display system and work vehicle display method

[0001] The present invention relates to a work vehicle display system and a work vehicle display method.

[0002] In a work vehicle such as a wheel loader, various settings related to the work vehicle are made via a screen displayed on a display device. Patent Document 1 discloses an example of a menu screen for a work vehicle. Patent Document 2 discloses an example of a service menu screen used by a service technician for the work vehicle.

[0003] JP 2002-067736 A JP 2010-180697 A

[0004] For example, information about a work vehicle, such as various items set for the work vehicle, may be organized in a hierarchical structure. In order to change a screen from one in which information in a higher hierarchy is displayed as a display item to one in which information in a lower hierarchy is displayed as a display item, the screen transitions to a screen in which the lower hierarchy information is displayed as a display item by selecting a display item from the higher hierarchy. For this reason, transitioning between screens may make it difficult to recognize the hierarchy of the displayed display items.

[0005] The present disclosure has been made in view of the above, and has an object to display hierarchically associated information relating to a work machine in a manner that allows the hierarchy to be recognized.

[0006] According to the present disclosure, there is provided a work vehicle display system comprising: a display device that displays information related to a work machine as display items; a selection device that can accept an operation to select the display items; and a controller that controls the display on the display device, wherein when a display item is selected by the selection device, the controller displays an icon image corresponding to the display item on a screen after selection, and when the selected display item has a hierarchy, the controller displays an icon image corresponding to the selected display item and icon images corresponding to display items that are higher in the hierarchy than the selected display item.

[0007] According to the present disclosure, there is provided a work vehicle display method in which a work vehicle display system executes the following steps: displaying information about a work machine as display items on a display device; when a display item is selected by a selection device capable of receiving an operation to select the display item, displaying an icon image corresponding to the display item on a screen after selection; and when the selected display item has a hierarchy, displaying an icon image corresponding to the selected display item and an icon image corresponding to a display item in a higher hierarchy than the selected display item.

[0008] According to the present disclosure, hierarchically associated information relating to a work machine can be displayed in a manner that allows the hierarchy to be recognized.

[0009] FIG. 1 is a right side view showing the overall configuration of a wheel loader, which is an example of a work vehicle according to an embodiment. FIG. 2 is a schematic diagram showing an example of the interior of a driver's cab. FIG. 3 is a plan view showing an example of a jog dial. FIG. 4 is a block diagram showing an example of the configuration of a work vehicle including a display device for the work vehicle. FIG. 5 is a diagram showing an example of a menu screen. FIG. 6 is a diagram showing another example of a menu screen. FIG. 7 is a diagram showing another example of a menu screen. FIG. 8 is a diagram showing another example of a menu screen. FIG. 9 is a diagram showing another example of a menu screen. FIG. 10 is a diagram showing another example of a menu screen. FIG. 11 is a diagram showing another example of a menu screen. FIG. 12 is a diagram showing another example of a menu screen. FIG. 13 is a block diagram showing a computer system according to an embodiment.

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, taking a wheel loader as an example of a work vehicle.

[0011] [Embodiment] (Work vehicle) Figure 1 is a right side view showing the overall configuration of a wheel loader, which is an example of a work vehicle according to an embodiment. In the following description, "front" and "rear" refer to the front and rear of the vehicle body 3. That is, the right side of Figure 1 is the "front" and the left side is the "rear". Furthermore, in the following description, "right", "left", "up" and "down" refer to the direction as viewed from the driver's cab.

[0012] As shown in Figure 1, the wheel loader 1 includes a work implement 2, a vehicle body 3, front wheels 4, and rear wheels 5. The wheel loader 1 is self-propelled by rotating the front wheels 4 and rear wheels 5. The wheel loader 1 uses the work implement 2 to perform a desired task.

[0013] The work implement 2 is a mechanism driven by hydraulic oil pressurized by a hydraulic pump (not shown). The work implement 2 is disposed in front of the vehicle body 3. The work implement 2 has a bucket 2a, a boom 2b, a boom cylinder 2c, and a bucket cylinder 2d. The bucket 2a is attached to the tip of the boom 2b. The bucket 2a is lifted as the boom 2b rises. The boom 2b is attached to the front of a front vehicle body 3a (described below). The boom cylinder 2c drives the boom 2b with pressurized oil discharged from the hydraulic pump. The bucket cylinder 2d drives the bucket 2a with pressurized oil discharged from the hydraulic pump.

[0014] The vehicle body 3 includes a front vehicle body 3a and a rear vehicle body 3b. The front vehicle body 3a and the rear vehicle body 3b are connected to each other so that they can swing left and right. The front vehicle body 3a is provided with a work implement 2 and front wheels 4. The rear vehicle body 3b is provided with rear wheels 5.

[0015] The rear body 3b includes a rear frame 6, a cab 7, a hydraulic oil tank 8, an engine compartment 9, and a cooling compartment 10. The rear frame 6 is a frame that forms the skeleton of the rear body 3b. The rear frame 6 supports the rear wheels 5, the cab 7, the hydraulic oil tank 8, the engine in the engine compartment 9, the cooling unit in the cooling compartment 10, and the like.

[0016] A driver's cab is provided inside the cab 7. Various operating members and control panels are provided in the cab 7. Hydraulic oil for driving the work equipment 2 and the like is stored in the hydraulic oil tank 8. A hydraulic pump supplies the hydraulic oil in the hydraulic oil tank 8 to the work equipment 2 and the like. In the embodiment, the wheel loader 1 has the cab 7 that forms an internal driver's cab, with the driver's seat surrounded by glass and pillars. The wheel loader 1 may also be equipped with a canopy-type cab without glass.

[0017] A ladder 12 is provided on the right side of the cab 7 to allow the operator to get in and out of the cab 7. The ladder 12 is fixed to the rear frame 6. The ladder 12 extends from the lower end of the cab 7 to near the ground. A forward work light 51 is provided above the cab 7 to brightly illuminate the front during night work, etc.

[0018] 2 is a schematic diagram showing an example of a driver's cab interior. A driver's seat (not shown) is located inside the cab. A steering wheel 21 is located in front of the driver's seat, and a display device 23 is located in front of that. On the other hand, various operating devices including a collective switch device 40 for operating the work equipment are located to the right of the driver's seat.

[0019] The display device 23 is a monitor that is arranged so that the operator can check it, and displays various images.

[0020] In this embodiment, the display device 23 displays, as display items, information relating to the wheel loader 1. The display device 23 displays, for example, a menu screen and a setting screen for performing various settings relating to the wheel loader 1.

[0021] The information related to the wheel loader 1 is, for example, information displayed on a menu screen and a setting screen on which various settings related to the wheel loader 1 are made. The information related to the wheel loader 1 is hierarchical. The information related to the wheel loader 1 is, for example, information related to "monitoring," "meter display selection," "brightness adjustment," "clock adjustment," and "language setting." "Monitoring," "meter display selection," "brightness adjustment," "clock adjustment," and "language setting" are all at the highest level. For example, the information related to "meter display selection" has "left side meter display selection" and "right side meter display selection" at the next lower level. Furthermore, for example, "left side meter display selection" has "SMR service meter," "ODO meter," and "CLK clock" at the next lower level. Furthermore, for example, "right side meter display selection" has "FUEL gauge," "SMR service meter," "ODO meter," and "CLK clock" at the next lower level. The information related to the wheel loader 1 is associated with an icon image indicating each piece of information. In this embodiment, such information relating to the wheel loader 1 is stored in a memory 85 (see FIG. 4) which is a storage device.

[0022] (Jog Dial) Fig. 3 is a plan view showing an example of a jog dial. The jog dial (selection device) 30 accepts input operations for various screens displayed on the display device 23. The jog dial 30 is disposed, for example, on the right front side of the armrest 20 on the right side of the driver's seat. The jog dial 30 can accept operations to select display items displayed on the display device 23. The jog dial 30 is provided with buttons 31, 32, 33, 34, and a dial 35.

[0023] Buttons 31, 32, 33, and 34 can be pressed in the depth direction perpendicular to the plane of the paper in FIG. 3 . Button 31 is located at the top left of dial 35. Button 31 is, for example, a return key. Button 32 is located at the top right of dial 35. Button 32 is, for example, a menu key. Button 33 is located at the bottom left of dial 35. Button 33 is, for example, a first shortcut key. Button 34 is located at the bottom right of dial 35. Button 34 is, for example, a second shortcut key.

[0024] The dial 35 is cylindrical. The dial 35 can be pressed along its central axis. When pressed, the dial 35 functions as an enter key, for example. The dial 35 can be tilted vertically and horizontally on the vehicle body 3 around its central axis. When tilted vertically or horizontally, the dial 35 functions as an operating lever for a work equipment lever, for example. The dial 35 can be rotated clockwise and counterclockwise around a central axis that is perpendicular to the plane of the paper in FIG. 3 . By turning the jog dial clockwise or counterclockwise by a predetermined angle A°, for example, it is possible to increase or decrease a number from "0" to "9" by one, thereby inputting a desired number.

[0025] For example, if the corresponding number at the start of numerical input is "0," turning the dial 35 clockwise by 5×A° will input "5," and then turning it counterclockwise by 2×A° will input "3."

[0026] (Group Switch Device) The group switch device 40 is disposed, for example, on the pillar 24 which is one of the components of the cab 7 .

[0027] In the embodiment, each switch provided on the collective switch device 40 has a function that can be turned on and off without screen transitions on the display device 23. The switches provided on the collective switch device 40 are not assigned functions that are urgently required when the operator is performing excavation and loading work by operating the work implement levers for moving the work implement 2, or when the operator is performing traveling work by operating the accelerator, brake, or steering 21 (not shown). The switches provided on the collective switch device 40 are switches that are operated arbitrarily when the wheel loader 1 is stopped, depending on the result of determining that they are functions that the operator requires at that time. Functions that do not require speed or urgency are assigned to functions that are executed by operating the switches provided on the collective switch device 40. The 12 switches shown in the present embodiment are merely an example of the number of switches provided on the collective switch device 40, and are not limited thereto.

[0028] Functions that require speed or urgency may be assigned as functions executed by operating the switches provided on the collective switch device 40. For example, in order to stop a work vehicle in an emergency, when one of the switches is operated, a drive signal may be output to a relay switch for cutting off a power supply line to a battery (not shown), which is then driven to stop the work vehicle. Alternatively, when one of the switches is operated in an emergency to stop the work vehicle, a switch state signal may be transmitted to the vehicle body controller 60 via the in-vehicle network N, and the vehicle body controller 60 may stop fuel injection from a fuel injection device (not shown) to the engine, thereby stopping the work vehicle.

[0029] 4 is a block diagram showing an example of the configuration of a work vehicle including a display device of the work vehicle. The display device 23, jog dial 30, collective switch device 40, vehicle controller 60, display controller 80, sensor group 71, and actuator group 72 are connected to an in-vehicle network N such as a CAN.

[0030] The vehicle controller 60 includes a numerical calculation device (processor) such as a CPU (Central Processing Unit). The vehicle controller 60 is a controller that controls a driving unit within the vehicle body, for example, the tilt angle of a swash plate of a swash plate-type hydraulic pump driven by the engine. The sensor group 71 includes an engine rotation sensor, a vehicle speed sensor, etc.

[0031] (Display Controller) The display controller 80 includes a numerical calculation device (processor) such as a CPU. The display controller 80 controls the display on the display device 23.

[0032] The display controller 80 displays information relating to the wheel loader 1 as display items on the display device 23. The display device 23 displays, for example, a menu screen and a setting screen for making various settings relating to the wheel loader 1.

[0033] When a display item displayed on the display device 23 is selected by the jog dial 30, the display controller 80 displays an icon image corresponding to the display item on the screen after selection. When the selected display item has a hierarchy, the display controller 80 displays an icon image corresponding to the selected display item and icon images corresponding to display items in a hierarchy higher than the selected display item.

[0034] When a display item is selected using the jog dial 30, the display controller 80 displays an icon image corresponding to the selected display item on the left side of the screen after selection, and displays the selected display item on the right side of the icon image.

[0035] The display controller 80 displays the icon image in a strip-shaped area that is arranged on the left side of the screen after the selection and has a curved shape that is convex to the right.

[0036] If there are two or more layers higher than the selected display item, the display controller 80 displays an icon image corresponding to the display item one layer higher than the layer of the selected display item.

[0037] The menu screens for each setting will be described with reference to Figures 5 to 10. Display items have a hierarchy. The highest hierarchy includes, for example, "Monitoring," "Meter Display Selection," "Brightness Adjustment," "Clock Adjustment," and "Language Setting." "Meter Display Selection" has "Left Meter Display Selection" and "Right Meter Display Selection" as display items in the hierarchy below. "Left Meter Display Selection" has "SMR Service Meter," "ODO Meter," and "CLK Clock" as display items in the hierarchy below. "Right Meter Display Selection" has "FUEL Gauge," "SMR Service Meter," "ODO Meter," and "CLK Clock" as display items in the hierarchy below.

[0038] Fig. 5 is a diagram showing an example of a menu screen. Fig. 5 is the top screen of a hierarchical screen related to "operator monitor settings." A screen 100 shown in Fig. 5 is arranged with a first area 101, a second area 110, a first band-shaped area 120, and a selection area 150. In Fig. 5, "meter display selection" is selected from the display items displayed in the selection area 150.

[0039] 5 , the icon images corresponding to the display items displayed in the first area 101 and the display items displayed in the second area 110 are at the same hierarchical level. The icon images corresponding to the display items displayed in the first strip area 120 and the display items displayed in the selection area 150 are at the same hierarchical level. The hierarchical level of the display items displayed in the first area 101 and the second area 110 is one hierarchical level higher than the hierarchical level of the display items displayed in the first strip area 120 and the selection area 150.

[0040] The first area 101 is disposed at the top of the screen 100. The first area 101 is a horizontally long rectangular area. The first area 101 is an area that displays icon images corresponding to the highest level of display items among the currently displayed display items, arranged in tab form. In the first area 101, an icon image corresponding to the currently selected display item among the icon images arranged in the first area 101 is displayed in a more emphasized manner than icon images corresponding to the other display items. In the first area 101 shown in FIG. 5, the icon image 101A corresponding to "Operator Monitor Settings" is displayed in a darker emphasized manner, and the other icon images are displayed in a lighter emphasized manner.

[0041] The second area 110 is disposed below the first area 101. The second area 110 has a horizontally long rectangular shape. The second area 110 is an area that displays a display item corresponding to a selected icon image among the icon images arranged in the first area 101. The second area 110 shown in FIG. 5 displays the character string "Operator Monitor Settings."

[0042] The first band region 120 is located on the left side of the screen 100. The first band region 120 is located below the second region 110. The first band region 120 is a band region with a curved shape that convexly curves to the right. The first band region 120 is a region that displays icon images corresponding to the lowest-level display items among the currently displayed display items. In the first band region 120, an icon image corresponding to the currently selected display item among the icon images corresponding to the display items displayed in the selection region 150 is displayed in a more emphasized manner than the icon images corresponding to the other display items. In the first band region 120 shown in FIG. 5, an icon image 120A corresponding to "meter display selection" is displayed in a darker emphasized manner, and the other icon images are displayed in a lighter emphasized manner. A cursor image 110C is displayed at the left end of the first band region 120.

[0043] Selection area 150 is located to the right of first band area 120. Selection area 150 is located below second area 110. Selection area 150 is an area that displays a list of display items that can be selected on screen 100. Selection area 150 is an area that displays a display item corresponding to a selected icon image among the icon images arranged in first band area 120 in a highlighted manner compared to the other display items. In selection area 150 shown in FIG. 5 , a frame image 150A indicating that the item is selected is displayed around the character string "METER DISPLAY SELECTION," and no frame image is displayed around the character strings of the other display items.

[0044] 5, when the dial 35 of the jog dial 30 is rotated, a frame image 150A indicating that the item is currently selected moves up or down among the list-like display items in accordance with the amount of rotation (angle of rotation). In conjunction with the up or down movement of the frame image 150A, the icon image displayed in a highlighted manner in the first band-shaped region 120 also changes. When the dial 35 of the jog dial 30 is pressed, the currently selected display item, in other words, the display item where the frame image 150A is located, is selected and confirmed.

[0045] Fig. 6 is a diagram showing another example of the menu screen. Fig. 6 is a "Meter Display Selection" screen transitioned from the screen shown in Fig. 5. Fig. 6 is a screen one level lower than Fig. 5 among the hierarchical screens related to "Operator Monitor Settings." A screen 100 shown in Fig. 6 is arranged with a first area 101, a second area 110, a first band area 120, a second band area 140, and a selection area 150. In Fig. 6, "Left Meter Display Selection" is selected from the display items displayed in the selection area 150.

[0046] 6 , the display items displayed in the second area 110 and the icon images corresponding to the display items displayed in the first strip area 120 are at the same hierarchical level. The icon images corresponding to the display items displayed in the second strip area 140 and the display items displayed in the selection area 150 are at the same hierarchical level. The icon images corresponding to the display items displayed in the first area 101 are at a hierarchical level one level higher than the hierarchical levels of the display items displayed in the second area 110 and the first strip area 120. The hierarchical levels of the display items displayed in the second area 110 and the first strip area 120 are at a hierarchical level one level higher than the hierarchical levels of the display items displayed in the second strip area 140 and the selection area 150.

[0047] The first region 101 is the same as that shown in FIG.

[0048] The second area 110 is an area that displays display items corresponding to the icon images displayed in the first band area 120. The second area 110 is an area that displays display items that are one level higher than the display items displayed in the second band area 140 and the selection area 150. The second area 110 shown in Fig. 6 is the display item selected in the selection area 150 shown in Fig. 5. The second area 110 shown in Fig. 6 displays the character string "METER DISPLAY SELECTION".

[0049] The first band area 120 is an area that displays icon images corresponding to the display items displayed in the second area 110. The first band area 120 is an area that displays icon images corresponding to display items that are one level higher than the level of the display items displayed in the second band area 140 and the selection area 150. The first band area 120 shown in Fig. 6 is an area that displays icon images corresponding to the display items selected in the selection area 150 shown in Fig. 5. The first band area 120 shown in Fig. 6 displays an icon image 120A corresponding to "meter display selection."

[0050] The second band region 140 is disposed to the right of the first band region 120. The second band region 140 is disposed below the second region 110. The second band region 140 is a band region having a curved shape that convexly curves to the right. The second band region 140 is a region that displays icon images corresponding to the lowest-level display items among the currently displayed display items. In the second band region 140, an icon image corresponding to the currently selected display item among the icon images corresponding to the display items displayed in the selection region 150 is displayed in a more emphasized manner than the icon images corresponding to the other display items. In the second band region 140 shown in FIG. 6, the icon image 140A corresponding to "Left Meter Display Selection" is displayed in a darker emphasized manner, and the other icon images are displayed in a lighter emphasized manner.

[0051] Selection area 150 is disposed to the right of second strip area 140. Selection area 150 is an area in which a display item corresponding to a selected icon image among the icon images arranged in second strip area 140 is displayed in a highlighted manner compared to other display items. In selection area 150 shown in Fig. 6, a frame image 150A indicating that the icon image is selected is displayed around the character string "Select left meter display," but no frame image is displayed around the character string "Select right meter display."

[0052] 6, when the dial 35 of the jog dial 30 is rotated, a frame image 150A indicating that the item is currently selected moves up or down among the list-like display items in accordance with the amount of rotation (angle of rotation). In conjunction with the up or down movement of the frame image 150A, the icon image highlighted in the second band-shaped region 140 also changes. When the dial 35 of the jog dial 30 is pressed, the currently selected display item, in other words, the display item where the frame image 150A is located, is selected and confirmed.

[0053] FIG. 7 is a diagram showing another example of a menu screen. FIG. 7 is a "Left Meter Display Selection" screen transitioned from the screen shown in FIG. 6. FIG. 7 is an example of a screen one level lower than FIG. 6 among hierarchical screens related to "Operator Monitor Settings." A screen 100 shown in FIG. 7 includes a first area 101, a second area 110, a first band area 120, a second band area 140, and a selection area 150. The hierarchical relationship among the first area 101, the second area 110, the first band area 120, the second band area 140, and the selection area 150 is the same as that shown in FIG. 6. In FIG. 7, "SMR Service Meter" is selected from the display items displayed in the selection area 150.

[0054] The first region 101 is the same as that shown in FIG.

[0055] The second area 110 is the same as that shown in Fig. 6. The second area 110 shown in Fig. 7 is the display item selected in the selection area 150 shown in Fig. 6. The second area 110 shown in Fig. 7 displays the character string "Select left meter display."

[0056] The first band area 120 is the same as that shown in Fig. 6. The first band area 120 shown in Fig. 7 is an area that displays an icon image corresponding to the display item selected in the selection area 150 shown in Fig. 6. The first band area 120 shown in Fig. 7 displays an icon image 120A corresponding to "Left meter display selection."

[0057] The second band-shaped area 140 is the same as that shown in Fig. 6. In the second band-shaped area 140 shown in Fig. 7, the icon image 140A corresponding to the "SMR service meter" is displayed in a highlighted manner with a darker color, and the other icon images are displayed in a non-highlighted manner with a lighter color.

[0058] Selection area 150 is the same as in Fig. 6. In selection area 150 shown in Fig. 7, a frame image 150A indicating that the character string "SMR service meter" is selected is displayed around the character string, and no frame image is displayed around the character strings of the other display items.

[0059] Another example of the menu screen shown in Fig. 7 will be described with reference to Fig. 8. Fig. 8 is a diagram showing another example of the menu screen. An icon image 120A corresponding to "meter display selection" may be displayed in the first band-shaped area 120, and an icon image 140A corresponding to "left meter display selection" may be displayed in the second band-shaped area 140.

[0060] 7 will be described with reference to Fig. 9. Fig. 9 is a diagram showing another example of the menu screen. An icon image 120A corresponding to "meter display selection" may be displayed in the first band area 120, an icon image 140A corresponding to "left side meter display selection" may be displayed in the second band area 140, and a third band area 160 may be provided to the right thereof, displaying an icon image 160A corresponding to "SMR service meter."

[0061] FIG. 10 is a diagram showing another example of a menu screen. FIG. 10 is a "Right Meter Display Selection" screen transitioned from the screen shown in FIG. 6. FIG. 10 is a screen one level lower than FIG. 6 among hierarchical screens related to "Operator Monitor Settings." FIG. 10 is a screen with the same hierarchical level as FIG. 7. A screen 100 shown in FIG. 10 includes a first area 101, a second area 110, a first band area 120, a second band area 140, and a selection area 150. The hierarchical relationship among the first area 101, the second area 110, the first band area 120, the second band area 140, and the selection area 150 is the same as that shown in FIG. 6. In FIG. 10, "CLK Clock" is selected from the display items displayed in the selection area 150.

[0062] The first region 101 is the same as that shown in FIG.

[0063] The second area 110 is the same as that shown in Fig. 7. In the second area 110 shown in Fig. 10, the character string "Select right meter display" is displayed.

[0064] The first band area 120 is the same as that shown in Fig. 7. In the first band area 120 shown in Fig. 10, an icon image 120A corresponding to "Right meter display selection" is displayed.

[0065] The second band area 140 is the same as that shown in Fig. 6. In the second band area 140 shown in Fig. 10, the icon image 140A corresponding to the "CLK clock" is displayed in a highlighted manner with a darker color, and the other icon images are displayed in a non-highlighted manner with a lighter color.

[0066] Selection area 150 is the same as in Fig. 6. In selection area 150 shown in Fig. 10, a frame image 150A indicating that the character string "CLK CLOCK" is selected is displayed around the character string, and no frame image is displayed around the character strings of the other display items.

[0067] Another example of the menu screen shown in Fig. 10 will be described with reference to Fig. 11. Fig. 11 is a diagram showing another example of the menu screen. An icon image 120A corresponding to "meter display selection" may be displayed in the first band-shaped area 120, and an icon image 140A corresponding to "right meter display selection" may be displayed in the second band-shaped area 140.

[0068] 10 will be described with reference to Fig. 12. Fig. 12 is a diagram showing another example of the menu screen. An icon image 120A corresponding to "meter display selection" may be displayed in the first band-shaped area 120, an icon image 140A corresponding to "right-side meter display selection" may be displayed in the second band-shaped area 140, and a third band-shaped area may be provided to the right thereof, in which an icon image 160A corresponding to "CLK clock" may be displayed.

[0069] FIG. 13 is a block diagram showing a computer system according to an embodiment. The vehicle body controller 60 and the display controller 80 comprise a computer system 1000. The computer system 1000 includes a processor 1001 such as a CPU, a main memory 1002 including a nonvolatile memory such as a read-only memory (ROM) and a volatile memory such as a random access memory (RAM), a storage 1003, and an interface 1004 including an input / output circuit. The functions of the vehicle body controller 60 and the display controller 80 described above are stored as a program in the storage 1003. The processor 1001 reads the program from the storage 1003, loads it into the main memory 1002, and executes the above-described processing in accordance with the program. The program may be distributed to the computer system 1000 via a network.

[0070] The work vehicle display system 90 includes at least the display device 23 and a display controller 80. The work vehicle display system 90 may further include a jog dial 30.

[0071] (Display Method) A display method for the wheel loader 1 will now be described. Information relating to the wheel loader 1 is displayed as display items on the display device 23 by the display controller 80. When a display item is selected using the jog dial 30, the display controller 80 causes an icon image corresponding to the display item to be displayed on the screen after selection. When the selected display item has a hierarchy, the display controller 80 causes an icon image corresponding to the selected display item and icon images corresponding to display items in a hierarchy higher than the selected display item to be displayed.

[0072] (Effects) As described above, in the embodiment, when a display item is selected, an icon image corresponding to the display item can be displayed on the screen after selection. In the embodiment, if the selected display item has a hierarchy, an icon image corresponding to the selected display item and icon images corresponding to display items in a hierarchy higher than the selected display item can be displayed. According to the embodiment, hierarchically associated information related to the wheel loader 1 can be displayed so that the hierarchy can be recognized.

[0073] In the embodiment, when a display item is selected, an icon image corresponding to the display item is displayed on the left side of the screen after selection, and the selected display item is displayed on the right side of the icon image. In the embodiment, when a display item is selected and a screen transition is made, the icon image and the display item can be displayed side by side.

[0074] In the embodiment, an icon image can be displayed in a strip-shaped area that is located on the left side of the screen after selection and has a curved shape that is convex to the right. According to the embodiment, an icon image can be displayed in a first strip-shaped area or a second strip-shaped area that is shaped to match the shape of the jog dial 30, which is the selection device.

[0075] In the embodiment, if there are two or more layers higher than the selected display item, an icon image corresponding to the display item one layer higher than the layer of the selected display item can be displayed.

[0076] In the embodiment, the information relating to the wheel loader 1 is information displayed on a menu screen and a setting screen for performing various settings relating to the wheel loader 1. According to the embodiment, on the menu screen and setting screen for performing various settings relating to the wheel loader 1, information associated in a hierarchical manner can be displayed so that the hierarchies can be recognized.

[0077] In the embodiment, the information related to the wheel loader 1 is information related to monitoring, meter display selection, brightness adjustment, clock adjustment, and language setting. According to the embodiment, on the menu screen and setting screen for performing various settings related to the wheel loader 1, information associated in a hierarchical manner can be displayed so that the hierarchies can be recognized.

[0078] In the embodiment, when a display item is selected, an icon image corresponding to the display item can be displayed together with the display item on the screen after selection.

[0079] [Modifications] In the above embodiment, the work vehicle is not limited to a wheel loader, but can be other work vehicles such as a bulldozer, a hydraulic excavator, or a dump truck.

[0080] 1...wheel loader, 2...work machine, 2a...bucket, 2b...boom, 2c...boom cylinder, 2d...bucket cylinder, 3...vehicle body, 3a...front vehicle body, 3b...rear vehicle body, 4...front wheels, 5...rear wheels, 6...rear frame, 7...cab, 8...hydraulic oil tank, 9...engine compartment, 10...cooling compartment, 12...ladder, 20...armrest, 21...steering, 23...display device, 24...pillar, 30...jog dial (selection device), 40...collective switch device, 60...vehicle body controller, 71...sensor group, 72...actuator group, 80...display controller, 85...memory, 90...display system

Claims

1. A display system for a work vehicle comprising: a display device that displays information related to a work machine as display items; a selection device that can accept an operation to select the display items; and a controller that controls the display on the display device, wherein when a display item is selected by the selection device, the controller displays an icon image corresponding to the display item on a screen after selection, and when the selected display item has a hierarchy, the controller displays an icon image corresponding to the selected display item and icon images corresponding to display items that are higher in the hierarchy than the selected display item.

2. A work vehicle display system as described in claim 1, wherein when a display item is selected by the selection device, the controller displays an icon image corresponding to the display item on the left side of the screen after selection, and displays the selected display item on the right side of the icon image.

3. A work vehicle display system as described in claim 1, wherein the selection device is a jog dial, and the controller displays the icon image in a strip-shaped area that is positioned on the left side of the screen after selection and has a curved shape that is convex to the right.

4. A work vehicle display system as described in claim 1, wherein the controller displays an icon image corresponding to the display item at a level one level higher than the level of the selected display item when there are two or more levels higher than the selected display item.

5. A work vehicle display system according to claim 1, wherein the information relating to the work machine is information displayed on a menu screen and a setting screen for performing various settings relating to the work vehicle.

6. The display system for a work vehicle according to claim 5, wherein the information relating to the work machine is information relating to monitoring, meter display selection, brightness adjustment, clock adjustment, and language setting.

7. A work vehicle display system as described in claim 1, wherein when a display item is selected by the selection device, the controller displays an icon image corresponding to the display item together with the display item on the screen after selection.

8. A work vehicle display method executed by a work vehicle display system, comprising: displaying information relating to a work machine as display items on a display device; when a display item is selected by a selection device capable of receiving an operation to select the display item, displaying an icon image corresponding to the display item on a screen after selection; and when the selected display item has a hierarchy, displaying an icon image corresponding to the selected display item and icon images corresponding to display items in a hierarchy higher than the selected display item.

9. A work vehicle display method as set forth in claim 8, wherein, when a display item is selected by the selection device, an icon image corresponding to the display item is displayed on the left side of the screen after selection, and the selected display item is displayed on the right side of the icon image.

10. A work vehicle display method according to claim 8, wherein the selection device is a jog dial, and the icon image is displayed in a strip-shaped area that is positioned on the left side of the screen after selection and has a curved shape that is convex to the right.

11. A work vehicle display method as described in claim 8, wherein, when there are two or more levels higher than the selected display item, an icon image corresponding to the display item at the level one level higher than the level of the selected display item is displayed.

12. A work vehicle display method according to claim 8, wherein the information relating to the work machine is information displayed on a menu screen and a setting screen for performing various settings relating to the work vehicle.

13. The display method for a work vehicle according to claim 12, wherein the information relating to the work machine is information relating to monitoring, meter display selection, brightness adjustment, clock adjustment, and language setting.

14. The work vehicle display method according to claim 8, wherein, when the display item is selected by the selection device, an icon image corresponding to the display item is displayed together with the display item on the screen after selection.

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