JP2016078648A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle having a display part which can ensure the visibility of the outside of the work vehicle even when the surrounding is dark.SOLUTION: A tractor, which is a work vehicle, includes: a cabin 16 which covers a driving seat 161; a display 2 provided near the driving seat 161; and a control part which controls the display 2 to display a dark image on the entire surface of the display 2 based on a predetermined condition. The control part controls the display 2 to lower the brightness of the display part 2 based on the satisfaction of the predetermined condition.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a work vehicle, and more particularly to a work vehicle including a display unit in the vicinity of a driver seat.

  2. Description of the Related Art Conventionally, work vehicles such as tractors for agricultural work (see Patent Document 1) and wheel loaders for civil engineering work are known. In recent years, computerization of work vehicles has progressed, and for example, a display unit is provided in the vicinity of a driver's seat so that various information can be displayed (see Patent Document 2).

  Some work vehicles are equipped with headlamps and / or work lights, and work can be performed at night by lighting them.

JP 2010-163036 A JP 2014-73136 A

  However, when the surroundings are dark, such as at night, the interior of the vehicle becomes brighter than the outside of the vehicle due to the light emitted from the display unit, or the image on the display unit is reflected on the window glass, resulting in a decrease in visibility outside the vehicle.

  An object of this invention is to provide the work vehicle provided with the display part which can ensure the visibility outside a vehicle even in the condition where the periphery is dark.

  The work vehicle according to the present invention includes a cabin that covers the driver's seat, a display unit provided in the vicinity of the driver's seat, and a control that controls to display a dark color image on the entire surface of the display unit when a predetermined condition is satisfied. A part.

  In the work vehicle, the control unit may perform control so as to lower the luminance of the display unit based on the establishment of the predetermined condition.

  In the work vehicle described above, the predetermined condition may be satisfied by lighting of a headlamp or a work lamp.

  The work vehicle may include an illuminance sensor that detects brightness outside the vehicle, and the predetermined condition may be satisfied when the brightness outside the vehicle is equal to or less than a predetermined threshold.

  Further, the work vehicle includes an operation button that can be turned on to determine and operate an item displayed on the display unit, and the control unit reduces the brightness of the operation button based on the establishment of the predetermined condition. You may make it control to.

  In the work vehicle, the predetermined condition may be satisfied by operating a specific operation button.

  In the work vehicle, when the operation button is operated in a state where a dark image is displayed on the display unit, the control unit controls to return to the image displayed immediately before the dark image. You may make it do.

  Further, the work vehicle includes an encoder dial for selecting and operating items displayed on the display unit, and when the encoder dial is operated in a state where a dark color image is displayed on the display unit, The control unit may control to return to the image displayed immediately before the dark image.

  According to the work vehicle of the present invention, in a situation where the surroundings are dark, such as at night, a dark color image is displayed on the entire surface of the display unit, so that the display unit becomes dark, and light emission from the display unit causes the interior of the cabin from the outside of the cabin (outside the vehicle). It is possible to prevent the inside of the vehicle from becoming too bright or to prevent the image on the display unit from being reflected on the window glass of the cabin, thereby ensuring visibility outside the vehicle.

  Further, according to the work vehicle of the present invention, by lowering the luminance of the display unit in addition to displaying the dark color image, the display unit becomes further darker and becomes closer to the state where the display unit is turned off.

  Further, according to the work vehicle of the present invention, the dark color image can be automatically displayed when the surroundings become dark by linking the display of the dark color image with the lighting of the headlamp or the work light.

  Further, according to the work vehicle of the present invention, the dark color image is automatically displayed when the surrounding becomes dark by comparing the detection value of the illuminance sensor with a predetermined threshold value to determine whether to display the dark color image. Can do.

  Further, according to the work vehicle of the present invention, the brightness of the operation button is lowered in addition to displaying a dark color image, so that the interior of the vehicle becomes too bright from outside the vehicle due to light emission of the operation button, or the operation button is reflected on the window glass. It is possible to prevent dripping and ensure visibility outside the vehicle.

  Further, according to the work vehicle of the present invention, when a dark color image is displayed by operating a specific operation button, the operator is concerned about the reflection of the image of the display unit on the window glass, etc. By operating the, a dark color image can be immediately displayed to ensure visibility.

  Further, according to the work vehicle of the present invention, when the operation button or the encoder dial is operated in a state where the dark color image is displayed, the original image can be easily restored by returning to the image displayed immediately before the dark color image. It can be returned to the display state and is easy to use.

It is an external appearance perspective view of a tractor. It is the figure seen from the arrow X of FIG. It is the figure seen from the arrow Y of FIG. It is the figure seen from the arrow Z of FIG. It is a figure which shows the power transmission system of a tractor. It is a figure which shows the driver's seat of a tractor, and its periphery. It is a figure which shows an operator's visual field. It is a figure which shows the information network of a tractor. It is a figure which shows a display. It is a figure which shows the control system regarding a display. It is a figure which shows the screen displayed on the display. It is a figure which shows the screen displayed on the display. It is a figure which shows the screen displayed on the display. It is a figure which shows the screen displayed on the display.

  The technical idea of the present invention can be applied to any work vehicle. Below, it demonstrates using the tractor which is a typical work vehicle.

  First, the tractor 1 will be briefly described.

  FIG. 1 shows a tractor 1. 2 is a view as seen from the arrow X in FIG. 1, and FIG. 3 is a view as seen from the arrow Y in FIG. FIG. 4 is a view seen from the arrow Z in FIG. In addition, in the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The tractor 1 mainly includes a frame 11, an engine 12, a transmission 13, a front axle 14, and a rear axle 15. Further, the tractor 1 includes a cabin 16. The cabin 16 has a cockpit inside, and an accelerator pedal 162 and a shift lever 163 are arranged in addition to the driver's seat 161 (see FIG. 6).

  The frame 11 forms a skeleton at the front portion of the tractor 1. The frame 11 constitutes the chassis of the tractor 1 together with the transmission 13 and the rear axle 15. The engine 12 described below is supported by the frame 11.

  The engine 12 converts thermal energy obtained by burning fuel into kinetic energy. That is, the engine 12 generates rotational power by burning fuel. The engine 12 is connected to an engine control device (not shown). When the operator operates the accelerator pedal 162 (see FIG. 6), the engine control device changes the operating state of the engine 12 according to the operation. Further, the engine 12 is provided with an exhaust purification device 12E. The exhaust purification device 12E oxidizes particulates, carbon monoxide, hydrocarbons, etc. contained in the exhaust.

  The transmission 13 transmits the rotational power of the engine 12 to the front axle 14 and the rear axle 15. The rotational power of the engine 12 is input to the transmission 13 via a coupling mechanism. The transmission 13 includes a continuously variable transmission (I-HMT) 131 (see FIG. 5). When the operator operates the shift lever 163 (see FIG. 6), the continuously variable transmission 131 changes the operating state of the transmission 13 according to the operation.

  The front axle 14 transmits the rotational power of the engine 12 to the front tire 141. The rotational power of the engine 12 is input to the front axle 14 via the transmission 13. The front axle 14 is provided with a steering device (not shown). When the operator operates the handle 164 (see FIG. 6), the steering device changes the steering angle of the front tire 141 according to the operation.

  The rear axle 15 transmits the rotational power of the engine 12 to the rear tire 151. The rotational power of the engine 12 is input to the rear axle 15 via the transmission 13. The rear axle 15 is provided with a PTO output device 152 (see FIG. 5). When the operator operates the PTO switch 165 (see FIG. 7), the PTO output device 152 transmits rotational power to the working machine to be pulled according to the operation.

  Further, the tractor 1 includes a headlamp 18 and a work lamp 19 so that it can run and work at night. The headlamp 18 is provided on the front surface of the bonnet 17 that covers the engine 12. The headlamp 18 is composed of a pair of high beam units arranged in the upper stage and a pair of low beam units arranged in the lower stage. A pair of work lights 19 are provided on the upper front surface of the cabin 16 and a pair on the upper rear surface. The work lamp 19 improves workability by illuminating the vicinity of the tractor 1 when working.

  Next, the power transmission system of the tractor 1 will be described.

  FIG. 5 shows a power transmission system of the tractor 1. However, this figure simply represents only the part necessary for the description of the present embodiment.

  As described above, the transmission 13 transmits the rotational power of the engine 12 to the front axle 14 and the rear axle 15. That is, the transmission 13 has a mechanism for transmitting rotational power to the front axle 14 and a mechanism for transmitting rotational power to the rear axle 15. Here, a mechanism for transmitting rotational power to the front axle 14 will be described as a front drive mechanism 33.

  The front drive mechanism 33 includes a drive shaft 331, a constant speed drive gear 332, and a speed increasing drive gear 333. The front drive mechanism 33 includes a constant speed clutch 334, a constant speed driven gear 335, a speed increasing clutch 336, and a speed increasing driven gear 337. Further, the front drive mechanism 33 includes an output shaft 338.

  The drive shaft 331 is rotatably supported via a bearing. The constant speed drive gear 332 is attached to the drive shaft 331. The speed increasing drive gear 333 is also attached to the drive shaft 331. Therefore, the constant speed drive gear 332 and the speed increasing drive gear 333 rotate in a state of being integrated with the drive shaft 331.

  The constant speed clutch 334 is rotatably supported via a bearing. The constant speed driven gear 335 is attached to the inner hub of the constant speed clutch 334 while meshing with the constant speed drive gear 332. Therefore, the constant speed driven gear 335 rotates while being integrated with the inner hub of the constant speed clutch 334. On the other hand, the speed increasing clutch 336 is also rotatably supported via a bearing. The speed increasing driven gear 337 is attached to the inner hub of the speed increasing clutch 336 while meshing with the speed increasing drive gear 333. Therefore, the speed increasing driven gear 337 rotates while being integrated with the inner hub of the speed increasing clutch 336.

  The output shaft 338 is rotatably supported via a bearing. The constant speed clutch 334 has an outer cylinder attached to the output shaft 338. Therefore, the outer cylinder of the constant speed clutch 334 rotates while being integrated with the output shaft 338. On the other hand, the outer cylinder of the speed increasing clutch 336 is also attached to the output shaft 338. Therefore, the outer cylinder of the speed increasing clutch 336 rotates while being integrated with the output shaft 338.

  With such a structure, when the inner hub and outer cylinder of the constant speed clutch 334 are connected (when the constant speed clutch 334 is operated), the rotation of the drive shaft 331 is transmitted to the output shaft 338. Then, the propeller shaft 43 rotates and the front tire 141 is rotated via the differential mechanism 34. As described above, when the constant speed clutch 334 is operated to perform four-wheel drive, the peripheral speed of the rear tire 151 is equal to the peripheral speed of the front tire 141 (referred to as constant-speed four-wheel drive).

  Similarly, the rotation of the drive shaft 331 is transmitted to the output shaft 338 even if the inner hub and the outer cylinder of the speed increasing clutch 336 are connected (even if the speed increasing clutch 336 is operated). Then, the propeller shaft 43 rotates and the front tire 141 is rotated via the differential mechanism 34. As described above, when the speed increasing clutch 336 is operated to perform four-wheel drive, the peripheral speed of the front tire 141 is faster than the peripheral speed of the rear tire 151 (referred to as “speed-up four-wheel drive”).

  Next, the cockpit of the tractor 1 will be described.

  FIG. 6 shows the driver seat 161 and its surroundings. FIG. 7 shows the field of view of the operator.

  The cabin 16 has a window glass composed of a windshield 4, a rear glass 5, and both side glasses 6 on the front, rear, left and right thereof, and the interior (cabin) of the cabin 16 is partitioned from the exterior. The window glass is not particularly limited as long as it is a transparent plate capable of transmitting visible light, and may be a transparent resin material such as polycarbonate.

  In the cabin 16, an accelerator pedal 162 and a shift lever 163 are arranged in addition to the driver seat 161. Further, around the driver seat 161, there are a brake pedal 166, a clutch pedal 167, a reverser lever 168, a speed dial 169, an instrument panel 170, a control panel 171, a headlight switch 172, a work light switch 191, a front wheel drive switch 339. (See FIG. 9) and the like are arranged. The operator can operate the tractor 1 by operating the accelerator pedal 162 and the like while sitting on the driver's seat 161.

  Further, the tractor 1 includes the display 2 in the vicinity of the driver seat 161. The display 2 is disposed on the right front side of the driver seat 161 so that the operator can operate with the right hand. Hereinafter, the information network of the tractor 1 will be briefly described, and the display 2 and a control system related to the display 2 will be described.

  FIG. 8 shows an information network of the tractor 1. FIG. 9 shows the display 2. FIG. 10 shows a control system related to the display 2. The control device 3 includes a storage unit 31 and can store information necessary for control. The storage unit 31 may be provided outside the control device 3.

  The tractor 1 is provided with information networks in various places so that the maximum performance can be exhibited. Specifically, in addition to the engine 12, the transmission 13, the instrument panel 170, the control panel 171, and the display 2 constitute a controller area network (CAN) that can share information with each other.

  In the tractor 1, the display 2 is disposed on the side console (see FIGS. 6 and 7). The display 2 includes a liquid crystal panel (display unit) 21, an encoder dial 22, an enter button (operation button) 23, and five command buttons (operation buttons) 24 to 28.

  The liquid crystal panel 21 is provided in the center of the front surface of the display 2. The liquid crystal panel 21 also includes a backlight using an LED (Light Emitting Diode) or the like as a light source. The liquid crystal panel 21 can display a predetermined screen based on an instruction from the control device (control unit) 3. For example, the liquid crystal panel 21 can display the opening screen S1 based on an instruction from the control device 3 (see FIG. 11). The liquid crystal panel 21 can display other screens based on instructions from the control device 3 (see FIGS. 12 to 14).

  The encoder dial 22 is provided on the right side of the upper surface of the display 2. The encoder dial 22 has a built-in rotary encoder, and when the element (item) displayed on the liquid crystal panel 21 is selected, the operator's intention (selection operation) for scrolling the tab or traversing the highlight display is selected by the control device 3. Can communicate. For example, the encoder dial 22 can transmit the operator's intention to scroll the tab to the control device 3 when selecting the displayed number or alphabet (see FIG. 12). Further, the encoder dial 22 can transmit the operator's intention to traverse the highlight display to the control device 3 when selecting the displayed icon (see FIG. 13).

  The enter button 23 is provided integrally with the encoder dial 22. The enter button 23 is an operation button corresponding to the vertical movement of the encoder dial 22 and is operated by pressing the upper surface of the encoder dial 22. The enter button 23 may be a push button provided on the upper end surface of the encoder dial 22.

  The enter button 23 can transmit the operator's intention (decision operation) to the effect of determining one of the elements (items) displayed on the liquid crystal panel 21 to the control device 3. For example, the enter button 23 can transmit the operator's intention to the effect of determining one of the displayed numbers or English characters to the control device 3 (see FIG. 12). Moreover, the enter button 23 can transmit the operator's intention to the effect of determining one icon among the displayed icons to the control device 3 (see FIG. 13).

  The five command buttons 24 to 28 are operation buttons for determining and operating the icon displayed at the upper end of the screen. The command buttons 24 to 28 are provided side by side in the upper front portion of the display 2, and the command buttons 24 to 28 correspond to the icons immediately below displayed on the liquid crystal panel 21. The command buttons 24 to 28 can transmit the operator's intention to the effect that the icon directly below has been determined to the control device 3. When any of the command buttons 24 to 28 is pressed, the control device 3 executes a command corresponding to the icon. The icons and commands assigned to the command buttons 24 to 28 are different for each screen, and the icons and commands necessary for each screen are assigned.

  As commands, a command for instructing switching to the home screen S3 (icon is “HOME”), a command for instructing switching to a shortcut screen (screen arbitrarily set by the operator) (icon is “free 1” or “free”). 2 ”), a command for instructing the determination of one element (the icon is“ decision ”), a command for instructing switching to the previous screen (the icon is“ return ”), and scrolling the tab, like the enter button 23 There are commands (indicating an arrow indicating the direction) for instructing the direction to be traversed or the direction to traverse the highlight display.

  Inside the five command buttons 24 to 28 and the enter button 23, a backlight 29 using LEDs or the like as light sources is arranged. The backlight 29 is controlled to be turned on / off and dimmed by the control device 3. By turning on the backlight 29, the position of each button can be easily seen even at night, and the operability is good. The backlight 29 can be controlled to be turned on and off in conjunction with the turning on and off of the headlamp 18.

  In addition, the control system of the tractor 1 has an illuminance sensor 7 that detects the brightness outside the vehicle. For the illuminance sensor 7, a light receiving element having a silicon photodiode or the like as a light receiving portion can be used. When the detected value of the illuminance sensor 7 is equal to or less than a predetermined threshold, the control device 3 determines that the outside of the vehicle is dark, such as at night, and determines that a predetermined condition described later is satisfied. Note that when the detection value of the illuminance sensor 7 is equal to or less than a predetermined threshold, the headlamp 18 and / or the work lamp 19 may be automatically turned on.

  By the way, the control device 3 of the tractor 1 performs control so that a black image (see FIG. 14) is displayed on the entire surface of the liquid crystal panel 21 based on establishment of a predetermined condition. By displaying the black image, an off screen, that is, a state in which the liquid crystal panel 21 is turned off can be created in a pseudo manner. The black image here does not necessarily need to be completely black, and may be any color close to black, such as gray close to black. Further, the image is not limited to a black image and may be a dark color image.

  Further, the luminance of the liquid crystal panel 21 may be controlled to be lowered based on establishment of a predetermined condition. As a result, the screen becomes darker and closer to the state in which the liquid crystal panel 21 is turned off. Furthermore, the luminance of the backlight 29 may be controlled to be lowered based on the establishment of a predetermined condition. As a result, the command buttons 24 to 28 and the enter button 23 are darkened. For example, it is preferable to lower the luminance to about 5% of the luminance in the normal lighting state.

  The establishment of the predetermined condition means that when the headlamp 18 or the work lamp 19 is turned on, the brightness outside the vehicle is equal to or lower than a predetermined threshold (when the detection value of the illuminance sensor 7 is equal to or lower than the predetermined threshold). Or a predetermined time (night time, for example, from 17:00 to 6:00). Accordingly, a black image can be automatically displayed on the liquid crystal panel 21 in a dark environment such as at night, so that the interior of the vehicle becomes too bright from outside the vehicle due to the light emission of the liquid crystal panel 21 and the command buttons 24 to 28, or the liquid crystal panel. It is possible to prevent the image 21 and the command buttons 24 to 28 from being reflected on the window glass and to reduce the visibility outside the vehicle, and to ensure the visibility outside the vehicle.

  The establishment of the above predetermined condition means that a specific button (a shortcut button in which screen OFF is registered) is pressed among the command buttons 24 to 28, or the “OFF” icon is determined on the home screen S3 or the like. It can also be the case. Thereby, when the operator is concerned about the reflection of the image of the liquid crystal panel 21 on the window glass, the operator can immediately display a black image by pressing a specific button to ensure visibility.

  The establishment of the predetermined condition may be a case where the reverser lever 168 is operated to the retracted position. As a result, it is possible to prevent the image of the liquid crystal panel 21 from being reflected on the rear glass 5 during the backward movement and the visibility from being lowered.

  The establishment of the predetermined condition may be a case where the two-wheel drive mode is set (the front wheel drive switch 339 is “OFF”). Thereby, it is possible to display a black image during traveling on the road, which does not particularly need to watch the display 2.

  Note that a combination of a plurality of the predetermined conditions described above may be regarded as establishment of the predetermined condition. For example, it may be considered that the predetermined condition is satisfied when the brightness outside the vehicle is equal to or less than a predetermined threshold and the reverser lever 168 is operated to the reverse position.

  When the encoder dial 22, the enter button 23, or the command buttons 24-28 is operated while the black image is displayed on the liquid crystal panel 21, the control device 3 displays the image displayed immediately before the black image. Control to return to. Thereby, it is possible to easily return to the original display state.

  Further, when the predetermined condition is not satisfied, the control device 3 may perform control so as to return to the image displayed immediately before the black image. Specifically, when the predetermined condition is not satisfied, the headlamp 18 or the work lamp 19 is turned off, or the brightness outside the vehicle exceeds a predetermined threshold (the detection value of the illuminance sensor 7 is a predetermined threshold). Or a predetermined time (daytime, for example, from 6:00 to 17:00). Thereby, in the situation where the surroundings became bright, such as when the day dawns, it is possible to automatically return to the original display state.

  The case where the predetermined condition is no longer satisfied may be a case where the reverser lever 168 is operated from the retracted position to the advanced position. Thereby, when moving from backward to forward, the original display state can be automatically restored.

  The case where the predetermined condition is not satisfied is when the two-wheel drive mode is changed to the four-wheel drive mode (the front wheel drive switch 339 is set to “constant speed four-wheel drive” or “speed-up four-wheel drive”). You can also Thereby, when shifting from road running to field running, the original display state can be automatically restored.

  Further, even when a black image is displayed on the liquid crystal panel 21, it is preferable to automatically display a warning screen when a warning needs to be displayed.

  The above-described control for automatically displaying a black image may allow an operator to arbitrarily set whether to perform such control.

  Below, the screen displayed on the display 2 in connection with the display of a black image and the operation method of the display 2 are demonstrated.

  11 to 14 show screens displayed on the display 2. However, each figure shows only a part necessary for the description of the present embodiment.

  First, an opening screen S1 is displayed on the display 2 (see FIG. 11). On the opening screen S1, a symbol mark Sm is displayed near the center. The symbol mark Sm is a design symbolizing the supplier manufacturer. The symbol mark Sm floats on a black background image and gives a strong impression to the operator.

  Next, the lock release screen S2 is displayed on the display 2 (see FIG. 12). On the unlock screen S2, four scroll boxes Sb1 to Sb4 for inputting the password are displayed in a horizontal row. Any one of the scroll boxes Sb1 to Sb4 selected is highlighted (refer to part H in the figure). The scroll boxes Sb1 to Sb4 can scroll numbers from 0 to 9 or English letters from A to F in the vertical direction.

  In the unlock screen S2, icons 251, 261, 271, and 281 corresponding to the command buttons 25 to 28 are displayed at the upper end. On the unlock screen S2, a dialog box Db1 in which the operator name is written and a dialog box Db2 in which the work machine name is written are displayed. The operator can confirm whether the operator name and the work machine name are correctly set in these dialog boxes Db1 and Db2.

  The operator can make a decision by turning the encoder dial 22 to scroll through numbers or letters and pressing the enter button 23. Further, in the unlock screen S2, it is also possible to select by scrolling a number or alphabet by pressing the command buttons 25 and 26 and pressing the command button 27. The decision can also be canceled by pressing the command button 28. If the password is wrong, a message to that effect is displayed.

  Next, the home screen S3 is displayed on the display 2 (see FIG. 13). On the home screen S3, eight icons Ia1 to Ia8 for selecting menus are displayed in two right and left columns. Any one of the selected icons Ia1 to Ia8 is highlighted (refer to part H in the figure). The highlight display is traversed according to the rotation of the encoder dial 22. Icons that cannot be selected are grayed out (see part G in the figure). In the home screen S3, icons 242, 252, 262, 272, and 282 corresponding to the command buttons 24 to 28 are displayed at the upper end.

  The registration method to the “free 1” icon 242 or the “free 2” icon 252 will be briefly described by taking the registration to “free 1” as an example. First, when the command button 24 corresponding to the “free 1” icon 242 is long pressed (for example, 3 seconds), the screen changes to a registration screen (not shown). Then, by operating the encoder dial 22 on the registration screen to select a desired icon (for example, “OFF” icon) and pressing the enter button 23, the icon is registered in the “free 1” icon 242. The icon is displayed instead of “1”.

  In the home screen S3, the operator can select the desired icons Ia1 to Ia8 by turning the encoder dial 22, and press the enter button 23 or the command button 27 to make a determination. Here, the icon Ia6 marked “OFF” is selected and determined.

  Next, a black screen S4 whose entire surface is a black image is displayed on the display 2 (see FIG. 14). At the same time, the brightness of the liquid crystal panel 21 and the backlight 29 is lowered. The black screen S4 is also displayed when the other predetermined condition described above is satisfied while the home screen S3 is displayed.

  When the operator operates the encoder dial 22, the enter button 23, or the command buttons 24-28 in the state where the black screen S4 is displayed after the transition from the home screen S3 as described above, the screen is displayed immediately before the black screen S4. Return to the display of the home screen S3.

1 Tractor (work vehicle)
3 Control device (control unit)
7 Illuminance sensor 16 Cabin 21 Liquid crystal panel (display unit)
22 Encoder dial 23 Enter button (operation button)
24 Command buttons (operation buttons)
25 Command buttons (operation buttons)
26 Command buttons (operation buttons)
27 Command buttons (operation buttons)
28 Command buttons (operation buttons)
161 Driver's seat S4 Black screen (black image)

Claims (8)

A cabin covering the driver's seat;
A display unit provided in the vicinity of the driver seat;
A work vehicle comprising: a control unit that controls to display a dark color image on the entire surface of the display unit based on establishment of a predetermined condition.   2. The work vehicle according to claim 1, wherein the control unit performs control so as to decrease a luminance of the display unit based on establishment of the predetermined condition.   The work vehicle according to claim 1, wherein the predetermined condition is established by lighting a headlamp or a work lamp. It has an illuminance sensor that detects the brightness outside the vehicle,
The work vehicle according to any one of claims 1 to 3, wherein the predetermined condition is satisfied when the brightness outside the vehicle is equal to or less than a predetermined threshold value. An operation button that can be turned on for determining and operating the item displayed on the display unit,
The work vehicle according to any one of claims 1 to 4, wherein the control unit performs control so as to reduce the luminance of the operation button based on the establishment of the predetermined condition.   The work vehicle according to claim 5, wherein the predetermined condition is established by operating a specific operation button.   The control unit controls to return to an image displayed immediately before the dark color image when the operation button is operated in a state where a dark color image is displayed on the display unit. The work vehicle according to claim 5 or claim 6. An encoder dial for selecting and operating items displayed on the display unit;
The control unit controls to return to an image displayed immediately before the dark color image when the encoder dial is operated in a state where a dark color image is displayed on the display unit. The work vehicle according to any one of claims 1 to 7.