Work vehicle

Abstract

To provide a mobile vehicle in which the volume of a notification sound is adjusted according to the operational state of an equipped work device, concerning a mobile vehicle equipped with a work device on a vehicle body.SOLUTION: A mobile vehicle includes: an operational state detection part 79 for detecting an operational state of a work device 17; a sound notification device 54 for outputting a notification sound based on an announcement request; a sound notification control part 51 for adjusting volume of the notification sound outputted from the sound notification device 54, according to a detection result of the operational state detection part 79.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle having a work implement mounted on the vehicle body. [Background technology]

[0002] Work vehicles are equipped with devices that provide audible guidance, warnings, and the like to the driver. For example, Patent Document 1 discloses a combine harvester that automatically adjusts the volume of an audible alarm device according to the level of noise from the device, such as engine speed. Furthermore, Patent Document 2 discloses an alarm device for a work vehicle that can change the volume of the audio notification of each of a plurality of pieces of message information according to the type and timing of each piece of message information. With this alarm device for a work vehicle, the volume of the notification when message information is not being issued can be set lower than the volume of the notification when message information is being issued when the engine is running. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Unexamined Utility Model Publication No. 59-142891 [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-104249 Summary of the Invention [Problem to be solved by the invention]

[0004] In the combine harvester disclosed in Patent Document 1, the volume of the audible alarm when the engine is running is set higher than the volume of the audible alarm when the engine is not running, but the noise of the implements other than the engine is not taken into consideration. As a result, Patent Document 1 does not solve the problem that, depending on the implements installed, some drivers may not be able to hear the audible alarm, and conversely, some drivers may find the audible alarm too loud.

[0005] The warning device for a work vehicle in Patent Document 2 also discloses that the volume of the message information when the engine is not running is lower than the volume of the message information when the engine is running, but does not disclose that the volume of the message information is changed depending on the operating state of the work equipment installed.

[0006] In view of the above situation, an object of the present invention is to provide a work vehicle equipped with a work implement on the vehicle body, in which the volume of an alarm sound is adjusted depending on the operating state of the equipped work implement. [Means for solving the problem]

[0007] The work vehicle according to the present invention comprises: via a coupling device Work equipment selectively an operation state detection unit that can be mounted on a vehicle body and that detects the operation state of the working device; a sound alarm that outputs an alarm sound based on an alarm request; and a sound alarm control unit that adjusts the volume of the alarm sound output from the sound alarm based on the detection result of the operation state detection unit; The vehicle includes a device identification unit that identifies whether the work device mounted on the vehicle body is a specific work device for which the volume should be adjusted, and when the work device is the specific work device, the sound notification control unit adjusts the volume. . Further, the work vehicle according to the present invention is A work vehicle equipped with a work device on a vehicle body, the work vehicle comprising: an operation state detection unit that detects the operation state of the work device; a sound alarm that outputs an alarm sound based on an alarm request; a sound alarm control unit that adjusts the volume of the alarm sound output from the sound alarm according to the detection result of the operation state detection unit; a device identification unit that identifies whether the work device equipped on the vehicle body is a specific work device for which the volume should be adjusted; and a work content setting unit that sets the work content to be performed using the work device equipped on the vehicle body, wherein the device identification unit determines whether the set work device is the specific work device based on the setting result in the work content setting unit, and if the work device is the specific work device, the sound alarm control unit adjusts the volume.

[0008] With this configuration, the volume of the alarm sound output from the sound alarm is adjusted according to the operating state of the work equipment equipped on the work vehicle, thereby appropriately resolving the problems of the alarm sound being difficult to hear or being too loud.

[0009] Depending on the type of working device equipped on a work vehicle, some do not emit any noise even when equipped, some operate substantially constantly when equipped and emit a loud noise, and some operate at intervals even when equipped, making a loud noise when in operation and virtually no noise when not in operation. For this reason, it would be convenient to selectively adjust the volume of the warning sound depending on the type of working device equipped and its operating state, but this requires effort and knowledge about the working device. To facilitate the volume adjustment of such warning sounds, it is preferable to automate this adjustment. One aspect of the present invention includes a device identification unit that identifies whether the working device equipped on the vehicle body is a specific working device for which the volume adjustment is required, and if the working device is the specific working device, the sound notification control unit adjusts the volume.

[0010] In a preferred embodiment for adjusting the volume of the alarm sound using a device identification unit, the sound alarm control unit increases the volume of the alarm sound above a normal volume when operation of the specific work device is detected. In other words, when a work device that is constantly operating and produces a loud noise is detected as the specific work device, the alarm sound is set to an appropriately large volume.

[0011] In a preferred embodiment when a work device is installed whose noise volume changes significantly depending on its operating state, the sound notification control unit changes the degree to which the volume is increased depending on the operating state of the specific work device. This configuration is particularly suitable for work devices that are not operated continuously but are operated at intervals, and that emit substantially no noise when not in operation but emit a loud noise when in operation. With this configuration, the alert sound is automatically set to an appropriate low volume when the installed work device is silent (low noise), and is automatically set to an appropriate high volume when the work device is emitting a loud noise. This prevents the driver, including the supervisor, from finding the alert sound annoying.

[0012] Depending on the type of work equipment, the noise level varies from low to high. Therefore, in one aspect of the present invention, the sound notification control unit varies the degree to which the volume is increased depending on the type of the specific work equipment. As a result, even if work equipment with different noise characteristics is selectively installed, the notification sound is set to an appropriate volume, thereby avoiding the problem of drivers, including supervisors, being unable to hear the notification sound.

[0013] Special work equipment performs a wide variety of tasks, and the volume of noise varies depending on the task. Therefore, the task type of the work equipment is also important in controlling the volume adjustment of the alert sound. For this reason, one aspect of the present invention includes a task type setting unit that sets the task type to be performed using the work equipment mounted on the vehicle body, and the equipment identification unit determines whether the set work equipment is the specific work equipment based on the setting result of the task type setting unit. With this configuration, the volume of the alert sound can be adjusted not simply based on the type of work equipment, but also taking the task type into consideration, enabling effective volume adjustment of the alert sound.

[0014] It is not uncommon for drivers, including supervisors, to be unaware of the noise characteristics of the work equipment being equipped. For this reason, one aspect of the present invention provides a work equipment identification unit that identifies the work equipment equipped on the vehicle body, and the equipment identification unit determines whether the work equipment is the specified work equipment based on the identification result of the work equipment identification unit. In this configuration, the work equipment identification unit detects the type of work equipment, and based on the detection result, the equipment identification unit determines whether the equipped work equipment is a work equipment for which the alarm volume is to be adjusted, i.e., whether it is a specified work equipment, thereby automatically adjusting the volume of the alarm sound appropriately for the equipped work equipment.

[0015] In one specific embodiment of the work device identification unit, an identification information acquisition unit is provided that can receive a work device identification signal transmitted from the work device, and the work device identification unit determines whether the work device is the specified work device based on the work device identification signal received by the identification information acquisition unit. In another specific embodiment of the work device identification unit, an identification information acquisition unit is provided that reads a work device identification code assigned to the work device, and the work device identification unit determines whether the work device is the specified work device based on the work device identification code read by the identification information acquisition unit. This makes it possible to detect a specified work device automatically and with high reliability. It is also advantageous if the work device identification signal and work device identification code include not only the type of work device but also information on its noise characteristics (including noise characteristics for each work type).

[0016] Examples of work implements that are particularly suitable for adjusting the volume of the alarm sound according to the present invention include rotary tools, plows, and harrows, which are likely to produce relatively loud noises.

[0017] In one aspect of the present invention, the notification sound is a voice guidance classified by urgency or importance, and the volume is adjusted according to the urgency or importance. The voice guidance notifies various contents that differ depending on the urgency or importance. In this case, voice guidance with a high urgency or importance is required to be notified at a volume so loud that it is annoying to drivers, including supervisors. With this configuration, such a requirement can be easily met. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a side view of a tractor, which is an example of a work vehicle. [Figure 2] FIG. 2 is a functional block diagram of an electronic control system. [Figure 3] FIG. 2 is a schematic diagram showing the flow of information in the adjustment control of the sound notification volume. [Figure 4] FIG. 10 is a schematic diagram showing an example of a selection screen for a work device to be used. [Figure 5] FIG. 10 is a schematic diagram showing an example of a volume forcible change screen for forcibly changing the volume of a sound alarm. DETAILED DESCRIPTION OF THE INVENTION

[0019] In this specification, unless otherwise specified, "front" means forward in the longitudinal direction (traveling direction) of the aircraft, and "rear" means rearward in the longitudinal direction (traveling direction) of the aircraft. Also, left-right or lateral direction means the transverse direction (width direction) of the aircraft that is perpendicular to the longitudinal direction of the aircraft. "Above" or "below" refers to the positional relationship in the vertical direction (perpendicular direction) of the aircraft, and indicates the relationship in terms of height above ground.

[0020] Next, a tractor that travels manually or automatically in a field will be described as a work vehicle according to the present invention with reference to the drawings. In the embodiment shown in FIG. 1, the tractor is equipped with an engine E as a power source, but an electric motor may also be installed as a power source. A vehicle body 1 is supported on the ground by front wheels 11 and rear wheels 12 to which power from the engine E is supplied via a transmission TR. A driver's unit 15 is provided in the center of the vehicle body 1.

[0021] The front wheels 11 function as steering wheels, and changing their steering angle changes the direction of travel of the tractor. The steering angle of the front wheels 11 is changed by the operation of a steering mechanism 13. The steering mechanism 13 includes a steering motor 14 for automatic steering. When driving manually, the front wheels 11 are steered by operating a steering wheel 16 located on a driver's unit 15.

[0022] A rotary tiller, which is a type of implement 17, is attached to the rear of the vehicle body 1 via a hydraulic lifting mechanism serving as a connecting mechanism 18. The connecting mechanism 18 includes a PTO shaft (power transmission shaft) 19, which is a component of the transmission TR. The implement 17, which is connected to the PTO shaft 19 that transmits engine power, can be operated by engine power. Note that the implements 17 selectively attached to the tractor via the connecting mechanism 18 include, in addition to rotary tillers, plows, harrows, fertilizer spreaders, pesticide sprayers, harvesters, and ridge-making implements. Typical implements 17 that generate relatively high noise levels include rotary tillers, plows, and harrows. Furthermore, examples of implements 17 that generate relatively low noise levels include fertilizer spreaders, pesticide sprayers, harvesters, and ridge-making implements.

[0023] Each working device 17 is provided with an identification information body 2 that identifies the working device 17, and an identification information acquisition unit 20 that receives identification information from the identification information body 2 is provided in the periphery of the connecting mechanism 18. The identification information is information for identifying the working device 17, and may be a unique number (identification number) individually assigned to the working device 17, or information including the model, type, and type of the working device 17. Furthermore, the information may include the work content and noise characteristics of the working device 17 as auxiliary information.

[0024] In this embodiment, the identification information medium 2 is a wireless tag, i.e., an RFID tag (Radio Frequency Identification), and the identification information acquisition unit 20 is a wireless tag reader (RFID reader) that receives a work tool identification signal including the identification information of the RFID tag.

[0025] In another embodiment, the identification information body 2 is a work tool identification code assigned to the work tool 17, and the identification information acquisition unit 20 is an identification code reader that reads the identification code. Note that an application that functions as an identification code reader can also be installed on a communication device such as a smartphone or tablet computer that is capable of data communication with the tractor's electronic control system, and such a communication device can also be used as the identification information acquisition unit 20. Furthermore, the identification information acquisition unit 20 may be configured by a camera unit with an image recognition function that can photograph the installed work tool 17, and the identification information may be acquired by image recognition using the photographed image. In this case, the identification information body 2 is the work tool 17 itself or a part of it.

[0026] The satellite positioning module 80 used to detect the vehicle's position is attached to the upper surface of the ceiling of the cabin that forms the driver's section 15 inside. The satellite positioning module 80 receives GNSS (Global Navigation Satellite System) signals (such as GPS signals) from positioning satellites to obtain the vehicle's position. Note that to complement the satellite navigation performed by the satellite positioning module 80, an inertial navigation module (not shown) incorporating a gyro acceleration sensor and a magnetic direction sensor is incorporated into the satellite positioning module 80. Of course, the inertial navigation module unit may be located in a different location from the satellite positioning module 80.

[0027] The tractor is equipped with a camera 31 and a millimeter-wave radar unit 32 used for obstacle detection. A plurality of cameras 31 are provided to acquire at least forward and rearward captured images. Similarly, a plurality of millimeter-wave radar units 32 are provided to cover at least the forward area and multiple areas. A LiDAR unit or a stereo camera unit may be used instead of the millimeter-wave radar unit 32.

[0028] A functional block diagram of the tractor's electronic control system is shown in Figure 2. The electronic control system of this embodiment is made up of a large number of electronic control units called ECUs (in Figure 2, one or more function blocks are made up of individual ECUs), various operating devices, sensors, switches, and a wiring network such as an on-board LAN that transmits data between them.

[0029] The electronic control system includes an engine control unit 4, an alarm control unit 5, a work device management unit 6, a vehicle control unit 7, a vehicle control unit 7, a machine position calculation unit 76, an equipment control unit 77, a sensor signal processing unit 78, an operation status detection unit 79, and an obstacle processing unit 100.

[0030] The engine control unit 4 controls the engine E and provides engine state information indicating the rotation speed and load state of the engine E to specific functional blocks of the electronic control system.

[0031] The vehicle position calculation unit 76 calculates the vehicle position, which is the map coordinates (or field coordinates) of at least one specific point on the vehicle 1, for example, the vehicle center, based on the positioning data successively sent from the satellite positioning module 80.

[0032] The equipment control unit 77 is connected to a vehicle driving equipment group 91 and a work equipment equipment group 92. The vehicle driving equipment group 91 includes control equipment related to vehicle driving, such as a gear change control device, a braking control device, a steering control device, etc. The work equipment equipment group 92 includes operating devices for operating the work equipment 17 and the linkage mechanism 18 equipped on the tractor.

[0033] The sensor signal processing unit 78 is connected to a group of driving condition detection sensors 93 and a group of working condition detection sensors 94. The group of driving condition detection sensors 93 includes sensors that detect the status of the engine speed adjustment tool, accelerator pedal, brake pedal, gear change tool, etc. The group of working condition detection sensors 94 includes sensors that detect the rotation speed of the PTO shaft 19, the status of the connecting mechanism 18, and the status of the working implement 17 equipped on the tractor.

[0034] The operating state detection unit 79 detects the operating state (rotation speed, etc.) of the engine E, the operating state (rotation speed, etc.) of the PTO shaft 19, and the operating state of the work implement 17 equipped on the tractor based on engine state information from the engine control unit 4 and detection data from the work state detection sensor group 94.

[0035] The obstacle processing unit 100 has a function of detecting the position and type of an obstacle (reflector) based on obstacle position information from the millimeter wave radar unit 32 and the captured image from the camera 31. In this embodiment, the obstacle processing unit 100 is a trained unit that uses deep learning, and the obstacle detection information that is output based on the input image (captured image) includes the type of obstacle as the detection result of the obstacle.

[0036] The vehicle control unit 7 has the function of causing the vehicle body 1 to travel for work using any of automatic travel control, manual travel control, and remote travel control. The vehicle control unit 7 includes a travel control unit 71, a travel command unit 72, a travel path setting unit 73, an obstacle avoidance command generation unit 74, and a work control unit 75.

[0037] The driving control unit 71 has engine control functions, steering control functions, vehicle speed control functions, etc., and provides driving control signals to a vehicle driving device group 91. The work control unit 75 provides work control signals to a work device device group 92 in order to control the movement of the work device 17 attached to the vehicle body 1.

[0038] The travel route setting unit 73 loads a travel route for automatic travel in a memory. The travel route loaded in the memory is sequentially read out and used as a target travel route in automatic travel. This travel route can also be used for guidance to guide the tractor along the travel route even in manual travel.

[0039] The driving command unit 72 generates an automatic steering command and a vehicle speed command as automatic driving commands and gives them to the driving control unit 71. The automatic steering command is generated so as to eliminate any azimuth deviation and position deviation between the driving route set by the driving route setting unit 73 and the aircraft's position calculated by the aircraft position calculation unit 76.

[0040] When the automatic driving mode is selected, the driving control unit 71 controls the vehicle driving devices 91 related to steering and the vehicle speed based on an automatic driving command given by the driving command unit 72. When the manual driving mode is selected, the driving control unit 71 generates a control signal and controls the vehicle driving devices 91 based on an operation by the driver.

[0041] The obstacle avoidance command generation unit 74 performs obstacle avoidance control based on the direction and distance from the vehicle body 1 to the obstacle, and generates an obstacle avoidance command by selecting the most appropriate command from among deceleration commands, stop commands, turning commands, etc. for the vehicle body 1, and gives it to the driving control unit 71.

[0042] The work control unit 75 provides a work control signal to the work implement device group 92 in order to control the movement of the work implement 17 attached to the vehicle body 1.

[0043] The notification control unit 5 generates notification data based on notification requests from each functional block of the electronic control system, and provides the notification data to the notification device group 50. The notification control unit 5 includes an audio notification control unit 51, an audio notification command unit 52, and an audio guidance selection unit 53, which will be described in detail later. The notification device group 50 includes an audio alarm 54 for announcing notification information by audio (including buzzer sounds, artificial voices, etc.). The audio alarm 54 includes a buzzer and a speaker. Of course, the notification device group 50 also includes lamps, displays, touch panels, etc. that visually notify the notification information.

[0044] The work device management unit 6 includes a work device identification unit 61 , a device specification unit 62 , and a work content setting unit 63 .

[0045] The sound alarm 54 emits an alarm sound in response to an alarm request from each functional block of the electronic control system acting as an alarm request source, such as the work device management unit 6, the vehicle control unit 7, or the obstacle processing unit 100. At this time, the sound alarm control unit 51 can adjust the volume of the alarm sound output from the sound alarm 54 in accordance with the detection result of the operation state detection unit 79. The flow of information in this sound alarm volume adjustment control is shown in FIG. 3.

[0046] First, when an alert request from an alert request source is received by the sound alert command unit 52, the sound alert command unit 52 provides an alert command generated in response to the alert request to the sound alert control unit 51. If the alert request includes the output of voice guidance, the alert command is also provided to the voice guidance selection unit 53. The voice guidance selection unit 53 reads out voice guidance matching the alert command from memory or generates it, and provides it to the sound alert control unit 51. The alert command is assigned the importance of the alert content as attribute data. The sound alert control unit 51 receives an operation result as a detection result from the operation status detection unit 79. Furthermore, the sound alert control unit 51 also receives operation device management information (including the operation timing of the operation device 17) from the operation device management unit 6.

[0047] The work device identification unit 61 of the work device management unit 6 receives identification information from the identification information acquisition unit 20, reads necessary data from the identification information, and provides the identification result to the device identification unit 62. Based on the identification result, the device identification unit 62 determines whether the work device 17 equipped on the vehicle body 1 is a specific work device that emits noise for which the volume of the alert sound is to be adjusted. If the equipped work device 17 is a specific work device, it provides specific work device information to the sound alert control unit 51. The specific work device information includes noise characteristics that indicate the noise level of the specific work device when it is operating and when it is not operating, noise characteristics for each type of work performed by the specific work device, and noise characteristics that indicate the relationship between engine speed and noise level. Work devices 17 that are not specific work devices are low-noise or silent, and therefore are not subject to increasing the volume of the alert sound, but the volume of the alert sound may be adjusted according to the preferences of the driver (supervisor).

[0048] The work content setting unit 63 can set the work content to be performed using the work device 17 equipped on the vehicle body 1. This setting may be performed manually or automatically based on the identification information from the identification information acquisition unit 20. If the specific work device is capable of performing multiple work contents, the work content setting unit 63 provides the work content that is currently scheduled to be performed or the work content that is currently being performed to the sound notification control unit 51 as the setting result. Furthermore, the sound notification control unit 51 is provided with the operating state as the detection result of the operating state detection unit 79.

[0049] That is, the sound notification control unit 51 is provided with notification commands, audio guidance, the operating state of the specific work device, the work content of the specific work device, etc. Based on this information, the sound notification control unit 51 adjusts the volume of the notification sound output from the sound alarm 54.

[0050] A specific example of the volume adjustment process by the sound notification control unit 51 is as follows. (1) The sound notification control unit 51 changes the volume adjustment amount of the notification sound depending on the type of specific work device. (2) When the operation of the specific work device is detected, the sound notification control unit 51 increases the volume of the notification sound by a certain percentage above the normal (default or previously set) volume. (3) The sound notification control unit 51 varies the degree to which the volume of the notification sound is increased depending on the operating state of the specific work apparatus. In other words, if the noise increases as the operating load of the specific work apparatus increases, the volume of the notification sound is increased proportionally as the operating load of the specific work apparatus increases. (4) The sound notification control unit 51 changes the volume adjustment amount of the notification sound depending on the type of work being performed by the specific work device. (5) The sound notification control unit 51 increases the volume of the notification sound as the importance or urgency of the notification command from the sound notification command unit 52 increases. (6) The sound notification control unit 51 changes the volume of the notification sound depending on the type of audio guidance from the audio guidance selection unit 53 (such as importance, length of the audio guidance, and difficulty of the audio guidance). (7) For specific work devices whose operation depends on the engine speed or the rotation speed of the PTO shaft 19, the volume of the warning sound increases as the engine speed or the rotation speed of the PTO shaft 19 increases.

[0051] The sound notification control unit 51 generates a sound notification signal (such as a buzzer sound or voice guidance) whose volume has been adjusted as described above as necessary, and transmits it to an appropriate sound alarm 54.

[0052] In the above description, the type and name of the work implement 17 equipped on the vehicle body 1, as well as information on whether the implement is a specific work implement subject to volume adjustment, are read from the identification information body 2 by the identification information acquisition unit 20. This process can also be performed manually by the driver (including the supervisor) checking the work implement 17 equipped on the vehicle body 1. In this case, for example, as shown in FIG. 4, a selection screen for the work implement to be used displayed on the tractor's display is used. Clicking on the name of the work implement on the selection screen shown as an example causes a list of available work implement names to pop up. Clicking on the name of the work implement 17 equipped by the driver ("Rotary A" in FIG. 4) further displays a work content setting screen for the work implement to be used. Through this work content setting screen, the driver can set the work content of the selected work implement 17. In FIG. 4, the type of load work (high, medium, low) and its noise level (4, 3, 2) are displayed. The results of input operations on the selection screen for the work implement to be used and the work content setting screen are provided to the work implement identification unit 61. This allows the work device identification unit 61 to obtain information about the work device 17 that is installed.

[0053] The appropriate volume of the sound alarm 54 in a noisy environment varies depending on the driver's personal hearing characteristics and preferences. For this reason, the volume adjusted by the sound alarm volume adjustment control can be forcibly changed at the driver's discretion. Figure 5 shows an example of a forced change screen for the sound alarm volume. On this screen, increase / decrease buttons for increasing / decreasing the volume adjustment amount and a numerical frame indicating the amount of increase / decrease are displayed.

[0054] [Another embodiment] (1) In the above-described embodiment, the working device 17 connected to the connecting mechanism 18 is the target of the sound notification volume adjustment process, but working devices 17 mounted on the front or side of the vehicle body 1 by other methods may also be the target of the sound notification volume adjustment process. Furthermore, working devices 17 such as air conditioners mounted inside the driver's section 15 may also be the target of the sound notification volume adjustment process. (2) The functional blocks constituting the electronic control system shown in Figure 2 are divided mainly for the purpose of explanation, and the components may be freely integrated or divided. For example, the identification information acquisition unit 20 may be incorporated into the work device management unit 6, and the work device management unit 6 may be incorporated into the vehicle control unit 7. (3) In the above-described embodiment, a tractor is used as the work vehicle, but instead, a normal combine harvester, a head-feeding combine harvester, a rice transplanter, a civil engineering machine, a construction machine, etc. may be used.

[0055] The configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction arises. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0056] The present invention is applicable to a work vehicle that can be selectively equipped with a work implement. [Explanation of symbols]

[0057] 1: Body 2: Identification information body 5: Notification control unit 6: Work equipment management unit 17: Work equipment 19: PTO shaft 20: Identification information acquisition unit 51: Sound notification control unit 52: Sound alarm control unit 53: Voice guidance selection section 54: Sound alarm 61: Work device identification unit 62:Device identification part 63: Work content setting section 79: Operation status detection unit E: Engine

Claims

1. A work vehicle in which a work implement is selectively attached to the vehicle body via a coupling device, an operating state detection unit that detects an operating state of the working device; a sound alarm that outputs a notification sound based on a notification request; a sound notification control unit that adjusts the volume of the notification sound output from the sound alarm in accordance with the detection result of the operation state detection unit; a device identification unit that identifies whether the work device mounted on the vehicle body is a specific work device for which the volume adjustment should be performed, A work vehicle in which the sound notification control unit adjusts the volume when the work implement is the specific work implement.

2. The work vehicle according to claim 1 , wherein the sound notification control unit increases the volume of the sound above a normal volume when operation of the specific work device is detected.

3. The work vehicle according to claim 2 , wherein the sound notification control unit changes the degree to which the volume of the sound is increased depending on the operating state of the specific work device.

4. The work vehicle according to claim 2 , wherein the sound notification control unit changes the degree to which the volume is increased depending on the type of the specific work device.

5. a work content setting unit that sets work content to be performed using the work device equipped on the vehicle body, The work vehicle according to claim 1 , wherein the device specifying unit determines whether the set work device is the specified work device based on the setting result in the work content setting unit.

6. 2. The work vehicle according to claim 1, further comprising a work device identification unit that identifies the work device equipped on the vehicle body, and the device identification unit determines whether the work device is the specified work device based on an identification result from the work device identification unit.

7. 7. The work vehicle according to claim 6, further comprising an identification information acquisition unit capable of receiving a work tool identification signal transmitted from the work tool, the work tool identification unit determining whether or not the work tool is the specified work tool based on the work tool identification signal received by the identification information acquisition unit.

8. 7. The work vehicle according to claim 6, further comprising an identification information acquisition unit that reads a work device identification code assigned to the work device, and the work device identification unit determines whether or not the work device is the specified work device based on the work device identification code read by the identification information acquisition unit.

9. The work vehicle according to claim 1 , wherein the specific work implement includes at least one of a rotary, a plow, and a harrow.

10. 8. The work vehicle according to claim 1, wherein the alarm sound is a voice guidance classified by urgency or importance, and the volume is adjusted according to the urgency or importance.

11. A work vehicle equipped with a work implement on a vehicle body, an operating state detection unit that detects an operating state of the working device; a sound alarm that outputs a notification sound based on a notification request; a sound notification control unit that adjusts the volume of the notification sound output from the sound alarm in accordance with the detection result of the operation state detection unit; a device identification unit that identifies whether the work device mounted on the vehicle body is a specific work device for which the volume adjustment should be performed; a work content setting unit that sets the work content to be performed using the work device equipped on the vehicle body, the device identification unit determines whether the set operation device is the specified operation device based on the setting result in the operation content setting unit; A work vehicle in which the sound notification control unit adjusts the volume when the work implement is the specific work implement.

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