JP6234895B2 - Work vehicle - Google Patents

Description

  The present invention relates to a working vehicle such as a tractor or a rice transplanter provided with a display device that displays information to a driver.

  A working vehicle such as a tractor has been proposed in which a tachometer indicating an engine speed and a meter panel having various display lamps are provided with a liquid crystal display (see Patent Document 1 below).

  Specifically, the working vehicle described in Patent Document 1 performs an elevating operation member that performs an elevating operation of a working machine connected to a traveling machine body, an elevating actuator that elevates the working machine, and performs operation control of the elevating actuator. A control device and the meter panel including the liquid crystal display unit are provided.

  In the working vehicle, when the elevating operation member is operated, the control device operates the elevating actuator so that the working machine is positioned at a height corresponding to an operation position of the elevating operation member, The liquid crystal display unit is switched from a standard screen to a position screen, and the operation position of the lifting operation member is digitally displayed on the position screen over a predetermined time.

  That is, in the work vehicle described in Patent Document 1, the liquid crystal display unit is moved up and down each time the work unit is moved up and down by the lift operation member without performing the display switching operation of the liquid crystal display unit. The operation position of the operation member is displayed.

Incidentally, work vehicles such as tractors are provided with various operation members in addition to the lifting operation members.
The working vehicle described in Patent Document 1 can know the lift position of the work implement without directly viewing the operation position of the lift operation member and the lift position of the work implement. The operability can be improved with respect to the raising / lowering operation of the working machine.

  However, only the operation position of the raising / lowering operation member is displayed on the liquid crystal display unit, and the operation state of the other various operation members is the operation position of the corresponding operation member or the operation member. If the operating state of the operating member controlled according to the operation is not observed, it cannot be grasped, and there is room for improvement in the operability of the operating members other than the lifting operation member.

Japanese Patent No. 5138310

  The present invention has been made in view of such a conventional technique, and an object of the present invention is to provide a work vehicle that can improve operability with respect to various operation members.

In order to achieve the object, the present invention includes a plurality of operation members, a plurality of operation members, a display device having a liquid crystal display unit, and a control device that controls the operation members and the display device. When one operating member of the plurality of operating members is operated in the work vehicle, the control device applies the one operating member to the one operating member according to the operating state of the operated one operating member. When the corresponding operation member is operated and the operated one operation member is a display target operation member registered in advance as an interrupt display target, the operated one member is displayed on the liquid crystal display unit. the identification information and the operation state of the operation member is configured to interrupt display, wherein the working vehicle, the display target registration for registering any operation member of the plurality of operating members as the display target operating member Work member is provided, wherein the controller provides a working vehicle to update and store the operation member selected by the display target registering operation member as the display target operating member.

  Preferably, the control device uses the liquid crystal display unit when the predetermined time has elapsed after the identification information and the operation state are interrupted and displayed on the liquid crystal display unit or when a predetermined interrupt display canceling operation is performed. It can be configured to return to the display state.

  Preferably, the control device may be configured to display an operable range of the one operation member and a current operation position with respect to the operable range as the operation state displayed on the liquid crystal display unit.

In the various configurations, preferably, the work vehicle includes an engine, a fuel injection device, a traveling system transmission structure that transmits rotational power from the engine to the drive wheels via a main transmission, and outwardly. A PTO shaft that outputs rotational power, a PTO transmission structure that transmits rotational power from the engine to the PTO shaft, an engine speed changing operation member, a main speed change operating member, an engine speed upper limit setting member, A maximum speed setting member .
In this case, in the state where the target engine speed when the engine speed changing operation member is operated to the maximum is limited to the engine speed upper limit set by the engine speed upper limit setting member, The operation of the fuel injection device is controlled so that the engine output rotational speed becomes a rotational speed corresponding to the operating position of the engine rotational speed changing operation member, and the main transmission operating member is operated at a maximum. The output rotational speed of the main transmission is changed according to the operation position of the main transmission operating member in a state where the maximum output rotational speed of the main transmission is limited to the rotational speed set by the maximum speed setting member. And controlling the operation of the main speed change actuator, the engine speed upper limit value set by the engine speed upper limit setting member and the maximum speed setting member Thus set are a plurality of traveling modes bounded by a combination of the maximum speed value, stores, is configured to receive a command by the manual operation may activate the any one drive mode of the plurality of traveling modes The

According to the work vehicle of the present invention, when one operation member of the plurality of operation members is operated, the control device performs the one operation according to the operation state of the operated one operation member. When the operating member corresponding to the member is operated and the operated one operating member is a display target operating member registered in advance as an interrupt display target, the operated one member is displayed on the liquid crystal display unit. Since the identification information of the operation member and the operation state thereof are interrupted and displayed, the operability of various operation members can be improved.
Further, the control device is configured to update and store the operation member selected by the display target registration operation member as the display target operation member. Accordingly, it is possible to appropriately inform the operator of necessary operation information.

FIG. 1 is a perspective view of a working vehicle according to an embodiment of the present invention. FIG. 2 is a rear view of the working vehicle. FIG. 3 is a plan view of the working vehicle. FIG. 4 is a schematic diagram of transmission of the working vehicle. FIG. 5 is a control block diagram of the working vehicle. FIG. 6 is a side view of a rotary tiller that is an example of a working machine attached to the working vehicle. FIG. 7 is a plan view of the rotary tiller. FIG. 8 is a schematic view of a meter panel in the working vehicle. FIG. 9 is a schematic diagram showing the display state of the display switching area of the liquid crystal display unit in the meter panel shown in FIG. 8, and FIGS. 9A to 9D show the hour meter display state and the vehicle speed display state, respectively. The engine load display state and the PTO rotation speed display state are shown. FIG. 10 is a flowchart of interrupt display control executed by the control device in the work vehicle. FIG. 11 is a schematic diagram illustrating an example of an interrupt display.

Hereinafter, preferred embodiments of a working vehicle according to the present invention will be described with reference to the accompanying drawings.
1 to 4 show a perspective view, a rear view, a plan view, and a transmission schematic diagram of the working vehicle 1 according to the present embodiment, respectively.

As shown in FIGS. 1-4, the said working vehicle 1 which concerns on this Embodiment has comprised the form of the tractor.
Specifically, as shown in FIGS. 1 to 4, the working vehicle 1 includes a vehicle frame 10, a driver seat 15 supported by the vehicle frame 10, an engine 50 supported by the vehicle frame 10, and left and right A pair of front wheels 20F, a pair of left and right rear wheels 20R, a traveling system transmission structure 60 that transmits rotational power from the engine 50 to driving wheels, a PTO shaft 95 that outputs rotational power to the outside, and the engine 50, a PTO transmission structure 80 for transmitting rotational power from the PTO shaft 95, a control device 100, and a fuel injection device 40 (see FIG. 5 below) for injecting fuel into the engine 50.

FIG. 5 shows a block diagram of the control device 100.
As shown in FIG. 5, in the present embodiment, the control device 100 has a plurality of controllers such as a main unit controller 101, an engine controller 102, and a meter controller 103.

  The plurality of controllers 101, 102, 103 are electrically connected to the corresponding sensors and actuators, respectively, and the plurality of controllers 101, 102, 103 are electrically connected to each other via a CAN communication bus 105. It is connected to the.

  Each of the controllers 101, 102, and 103 stores a calculation unit (hereinafter referred to as a CPU) including a control calculation unit that executes calculation processing based on signals input from the various sensors and the like, a control program, control data, and the like. ROM, an EEPROM in which setting values are stored without being lost even when the power is turned off, and an EEPROM in which the setting values can be rewritten, a RAM that temporarily holds data generated during calculation by the calculation unit, etc. Including a storage unit.

  As the output control of the engine 50, the control device 100 operates the engine speed change actuator so that the output speed of the engine 50 becomes a set speed by the engine speed change operation member 110 that is manually operated. It is configured to execute normal control.

  Specifically, as shown in FIG. 3 and FIG. 5, the working vehicle 1 sets the operation positions of the engine speed changing operation member 110 such as the accelerator pedal 111 and the accelerator lever 112 and the engine speed changing operation member 110. An operation side engine speed sensor 110a for detecting, a fuel injection device 40 acting as the engine speed change actuator, and an operation side engine speed sensor 50a for detecting the output speed of the engine 50 are provided.

As shown in FIG. 5, in the present embodiment, the fuel injection device 40 includes a fuel supply pump 42 that sucks fuel from a fuel tank 41 through a filter (not shown), and a pressure feed from the fuel supply pump 42. And a plurality of injectors 46 that inject the accumulated fuel in the common rail 45 into each cylinder of the engine 50.
In addition, the code | symbol 45a in FIG. 5 is a pressure sensor which detects the internal pressure of the said common rail 45. FIG.

  In the normal control, the control device 100 operates the injector 46 by using the set rotational speed detected by the operation side engine rotational speed sensor 110a as the target rotational speed of the engine output rotational speed.

  Specifically, in the control device 100, control data indicating the relationship between the engine speed and the injector control amount (fuel injection amount) is stored in advance in a storage unit such as a ROM. Controls the operation of the injector 46 using the control data.

  That is, the control device 100 inputs the operation position of the engine speed changing operation member 110 such as an accelerator lever from the accelerator sensor 110a, recognizes the target engine speed, and is calculated using the control data. The injector 46 is operated so as to inject a fuel injection amount corresponding to the rotational speed, and it is determined whether or not the actual engine rotational speed detected by the engine rotational speed sensor 50a matches the target engine rotational speed. The operation of the injector 46 is controlled so that they match.

  The working vehicle 1 according to the present embodiment is configured to be able to arbitrarily set the rotation speed upper limit value of the engine 50.

Specifically, as shown in FIG. 5, the working vehicle 1 is provided with an engine speed upper limit setting member 510.
In the state where the target engine speed when the engine speed changing operation member 110 is operated to the maximum is limited to the engine speed upper limit value set by the engine speed upper limit setting member 510, the control device 100 The operation of the fuel injection device 40 is controlled so that the output rotational speed of the engine 50 becomes a rotational speed corresponding to the operating position of the engine rotational speed changing operation member 110.
Note that reference numeral 510 a in FIG. 5 is a sensor that detects the operation position of the engine speed upper limit setting member 510.

  As described above, by providing the engine speed upper limit setting function, working machines such as a tillage device and a planting device in which rotational power is operatively transmitted from the engine 50 due to an erroneous operation on the engine speed changing operation member 110. It is possible to effectively prevent troubles caused by the input of unintended high rotational speed power.

  As shown in FIG. 4, in the present embodiment, the traveling system transmission structure 60 has a hydraulic continuously variable transmission (HST) 61 that acts as a main transmission.

As shown in FIG. 4, the HST 61 is configured to continuously change the rotational power from the engine 50 input via the main clutch 51.
Note that reference numerals 52 and 53 in FIG. 5 denote a charge pump and an auxiliary pump that are driven by rotational power from the engine 50 that is input via the main clutch 51.

  In the present embodiment, the HST 61 is configured to perform a speed change operation via a main speed change actuator 220 that is operation-controlled by the control device 100.

  Specifically, as shown in FIG. 5, in the working vehicle 1, the output rotation speed of the HST 61 detected by the operating-side shift sensor (speed sensor) 61 a is determined by the human transmission operation member 120 such as the main shift lever. The control device 100 controls the operation of the main transmission actuator 220 so that the speed according to the operation is achieved.

  Note that reference numeral 120a in FIG. 5 denotes an operation side shift sensor that detects an operation position (operation direction and / or operation amount) of the main transmission operation member 120.

  In addition, the working vehicle 1 according to the present embodiment is configured such that the upper limit value (maximum speed value) of the output rotation speed of the HST 61 when the main speed change operation member 120 is operated to the maximum can be arbitrarily set. ing.

Specifically, as shown in FIG. 5, the working vehicle 1 is provided with a maximum speed setting member 515.
The control device 100 is configured such that the maximum output rotation speed of the HST 61 when the main transmission operation member 120 is operated to the maximum is limited to the rotation speed set by the maximum speed setting member 515. The operation of the main transmission actuator 220 is controlled so that the output rotation speed of the HST 61 is changed according to the operation position of 120.
In addition, the code | symbol 515a in FIG. 5 is a sensor which detects the operation position of the said highest speed setting member 515. FIG.

  The maximum speed setting member 515 can be separated from the engine speed upper limit setting member 510, or both the members 510 and 515 can be constituted by a common operation member.

  That is, when the maximum speed setting member 515 and the engine speed upper limit setting member 510 are configured by a common member, the engine speed and the engine speed upper limit setting member 510 and the engine speed upper limit setting member 515 function as both A vehicle speed changeover switch (not shown) and an engine rotation / vehicle speed setting dial (not shown) are provided.

  The engine rotation / vehicle speed switch is a member for switching between an engine speed upper limit setting phase and a maximum speed setting phase.

  Specifically, the engine rotation / vehicle speed changeover switch can be switched between the engine side and the vehicle speed side, and the control device 100 allows the operator to rotate the engine according to the operation position of the engine rotation / vehicle speed changeover switch. It recognizes whether it wants to register the number upper limit value or the fastest value.

  Then, the control device 100 sets the value set by the engine rotation / vehicle speed setting dial on the side selected by the engine rotation / vehicle speed changeover switch (that is, the engine output rotation speed or the HST output rotation speed). Register as the upper limit.

  In the present embodiment, the control device 100 is defined by a combination of the engine speed upper limit value set by the engine speed upper limit setting member 510 and the maximum speed value set by the maximum speed setting member 515. A plurality of travel modes are stored, and any one of the plurality of travel modes can be activated in response to a command from an artificial operation.

That is, as shown in FIG. 5, the working vehicle 1 is provided with a travel mode switching operation member 520 that can be manually operated.
The travel mode switching operation member 520 is configured to be able to switch between the plurality of travel modes (for example, two types of travel modes of A mode and B mode).

  That is, the travel mode switching operation member 520 can selectively take a travel mode position (for example, an A mode position or a B mode position) corresponding to each of the plurality of travel modes in accordance with an artificial operation. Yes.

The controller 100 controls the engine speed upper limit setting member 510 and the uppermost setting member 510 in a state where the travel mode switching operation member 520 is located at one travel mode position (A mode position or B mode position in the example). When the high speed setting member 515 is operated, the values set by the operation are stored as the engine speed upper limit value and the maximum speed value in the one traveling mode.
The operation position of the travel mode switching operation member 520 is detected by a sensor 520a (see FIG. 5).

  Thus, in a state where a plurality of travel modes are stored, the control device 100 activates a travel mode corresponding to the operation position of the travel mode switching operation member 520.

  The travel mode switching operation member 520 is configured to be able to take a travel mode release position in addition to the plurality of travel mode positions, and when the travel mode switching operation member 520 is positioned at the travel mode release position. The control device 100 may be configured to reveal the release states of the plurality of travel modes.

As shown in FIG. 4, in the present embodiment, the traveling system transmission structure 60 has a forward / reverse switching device 62.
The forward / reverse switching device 62 is configured to switch and output the rotational direction of the rotational power operatively transmitted from the HST 61.

  Specifically, the forward / reverse switching device 62 is in a forward state in which the rotational power from the HST 61 is output to the drive wheel as rotational power in the normal rotation direction (forward direction), and the rotational power from the HST 61 is in the reverse direction ( The vehicle is configured to be able to selectively take a reverse state in which the rotational power in the reverse direction) is output toward the drive wheel and a neutral state in which power transmission from the HST 61 to the drive wheel is interrupted.

  The forward / reverse switching device 62 takes a forward state or a reverse state in accordance with an artificial operation to the forward / reverse switching operation member 130 such as an F / R lever that can be manually operated. A neutral state (power cutoff state) is taken in response to the clutch disengagement operation.

  In the present embodiment, the forward / reverse switching device 62 is configured to switch the output state by the forward / reverse switching actuator 230.

  Specifically, as shown in FIG. 5, in the working vehicle 1, the output state of the forward / reverse switching device 62 is changed according to the manual operation to the forward / reverse switching operation member 130 and the main clutch operation member 135. As described above, the control device 100 controls the operation of the forward / reverse switching actuator 230.

  Reference numerals 130a and 135a in FIG. 5 are an operation side forward / reverse sensor and an operation side main clutch sensor for detecting the operation positions of the forward / reverse switching operation member 130 and the main clutch operation member 135, respectively. This is a forward / reverse sensor that detects the operating state of the forward / reverse switching device 62.

  As shown in FIG. 4, in the present embodiment, the traveling system transmission structure 60 has a gear-type multi-stage transmission 63 that acts as an auxiliary transmission.

  The gear type multi-stage transmission 63 is disposed on the downstream side in the transmission direction of the forward / reverse switching device 62, and multi-speeds the rotational power input via the forward / reverse switching device 62 to change the traveling system. This is transmitted to the output shaft 65.

The multi-stage transmission 63 is configured to engage the shift stage selected by the sub-shift operation member 140 (see FIG. 5).
As shown in FIG. 4, in the present embodiment, the multi-stage transmission 63 has two speed stages, a high speed stage and a low speed stage.

  In the present embodiment, the multi-stage transmission device 63 is configured such that the shift state is switched by the auxiliary transmission actuator 240 (see FIG. 5).

  Specifically, as shown in FIG. 5, in the working vehicle 1, the control device 100 is configured so that the gear position of the multi-stage transmission device 63 is changed according to the manual operation to the auxiliary transmission operation member 140. Operation control of the auxiliary transmission actuator 240 is performed.

  In FIG. 5, reference numeral 140 a is an operation side auxiliary transmission sensor that detects the operation position of the auxiliary transmission operation member 140, and reference numeral 63 a is an auxiliary transmission sensor that detects the shift state of the multi-stage transmission 63.

  In the present embodiment, the pair of rear wheels 20R is a main drive wheel, and the pair of front wheels 20F is a steering wheel and a sub drive wheel.

  That is, as shown in FIGS. 4 and 5, the working vehicle 1 includes a turning operation member 115 such as a steering wheel that is manually operated, and an operation side turning sensor 115 a that detects an operation position of the turning operation member 115. A turning actuator 215 such as a power steering device for steering the steered wheels (the front wheel 20F in the present embodiment) and an operation side turning sensor 90a for detecting a vehicle turning angle are provided.

  Then, the control device 100 controls the turning actuator 215 so that the vehicle turning angle detected by the operation side turning sensor 90a becomes the operation angle of the turning operation member 115 detected by the operation side turning sensor 115a. Perform operation control.

  In the present embodiment, as shown in FIG. 4, the traveling system transmission structure 60 is further different from the pair of rear wheels 20 </ b> R that act as the main drive wheels by the rotational power of the traveling system output shaft 65. The main drive wheel side differential gear device 66 that transmits the motion, the sub drive wheel drive device 70 that inputs the rotational power of the traveling system output shaft 65, and the rotational power from the sub drive wheel drive device 70 acts as a sub drive wheel. And a pair of left and right brake devices 75L and 75R capable of applying a braking force to the pair of left and right main drive wheels, respectively. . In FIG. 4, only the left brake device 75L is shown.

  In the sub drive wheel drive device 70, the sub drive wheel (the front wheel 20F in the present embodiment) is changed to the main drive wheel (the present embodiment) in response to an artificial operation to the sub drive wheel drive switching operation member 145. , The rear wheel 20R), a four-speed constant speed state in which the rotational power of the traveling system output shaft 65 is output toward the sub drive wheels so as to be always driven at a constant speed, and a turning angle sensor 90a (FIG. 5). The sub drive wheel is driven at the same speed as the main drive wheel when the turning angle detected by the reference) is equal to or less than a predetermined angle, and when the turning angle exceeds the predetermined angle, the sub drive wheel is A four-turn turning speed increasing state in which the rotational power of the traveling system output shaft 65 is output to the sub drive wheels so as to be driven at a higher speed (for example, approximately double speed) than the main drive wheels, and the sub drive wheels Selects 2WD state that does not drive And it is configured so as to obtain taken.

  In the present embodiment, the sub drive wheel drive device 70 is switched in the transmission state via the sub drive wheel drive switching actuator 245.

  Specifically, as shown in FIG. 5, in the work vehicle 1, the control device is configured so that the sub drive wheel drive device 70 is in a transmission state corresponding to the manual operation to the sub drive wheel drive switching operation member 145. 100 controls the operation of the sub drive wheel drive switching actuator 245.

  In FIG. 5, reference numeral 145a is a sub drive wheel drive switching sensor for detecting the operation position of the sub drive wheel drive switching operation member 145, and reference numeral 70a is a transmission state of the sub drive wheel drive device 70. It is a sub drive wheel sensor.

  The pair of brake devices 75L and 75R can individually take a brake operation state and a brake release state in accordance with a manual operation to the pair of brake operation members 150L and 150R that are manually operated.

  In the present embodiment, the pair of brake devices 75L and 75R are switched between a brake operation state and a brake release state via a pair of brake actuators 250L and 250R, respectively.

  Specifically, the control device 100 sets the pair of brake devices 75L and 75R so that the pair of brake devices 75L and 75R are in a brake operation state or a brake release state according to an artificial operation on the pair of brake operation members 150L and 150R. Actuation control of the actuators 250L and 250R is performed.

  In FIG. 5, reference numerals 150La and 150Ra are sensors for detecting the operation state of the pair of brake operation members 150L and 150R, and reference numerals 75La and 75Ra are sensors for detecting the operation state of the pair of brake devices 75L and 75R. It is.

Next, the PTO transmission structure 80 will be described.
As shown in FIG. 4, in the present embodiment, the PTO transmission structure 80 includes a PTO clutch device 81 and a PTO transmission device 82.

The PTO clutch device 81 is configured to selectively transmit or cut off rotational power from the engine 50 input via the main clutch 51.
The PTO transmission 82 is configured to change the rotational power from the engine 50 input via the PTO clutch mechanism 81 and output it to the PTO shaft 95.

  That is, as shown in FIG. 5, the control device 100 performs a PTO clutch so that the PTO clutch device 81 is in a transmission state and a shut-off state in response to a manual operation to a PTO on / off operation member 160 that is manually operated. Actuation control of the actuator 260 is performed.

  Further, as shown in FIG. 5, the control device 100 controls the operation of the PTO speed change actuator 265 so that the PTO speed change device 82 performs a speed change operation in response to a manual operation on the PTO speed change operation member 165 that is manually operated. Is supposed to do.

In FIG. 5, reference numeral 160 a is a sensor that detects the operation position of the PTO on / off operation member 160, and reference numeral 81 a is a sensor that detects the operating state of the PTO clutch device 81.
Reference numeral 165a is a sensor that detects the operation position of the PTO speed change operation member 165, and reference numeral 82a is a sensor that detects the operating state of the PTO speed change device 82.
Reference numeral 95a denotes a sensor for detecting the rotational speed of the PTO shaft 95.

  The working vehicle 1 according to the present embodiment is configured such that the working machine 200 can be attached via a link mechanism 380 in a state where rotational power from the engine 50 can be transmitted via the PTO shaft 95. Yes.

  6 and 7 are a side view and a plan view of a rotary tiller 300, which is an example of the working machine 200, respectively.

  As shown in FIGS. 6 and 7, the rotary tiller 300 includes a frame structure 301 connected to the link mechanism 380, a tiller shaft 305 that is rotationally driven by the rotational power from the PTO shaft 95, and A tilling claw 306 provided on the tillage shaft 305, a main cover 310 covering the upper side of the rotation trajectory of the tilling claw 306, and swingable to the main cover 310 so as to cover the rear side of the rotation trajectory of the tilling claw 306. And a rear cover 311 connected thereto.

  The frame structure 301 includes a gear box 301a for inputting rotational power from the PTO shaft 95 through a transmission shaft, and a pair of main beams 301b connected to the left and right of the gear box 301a along the vehicle width direction. And an upper link frame 301c supported by the gear box 301a, supported by the main beam 301b, and connected to one of the pair of lower link frames 301d and one end of the pair of main beams 301b in the body width direction. A chain case 301e and a bearing plate 301f connected to the other outer end in the body width direction of the pair of main beams 301b so as to face the chain case 301e.

In the present embodiment, the frame structure 301 is connected to the vehicle main body of the working vehicle 1 through the link mechanism 380 so as to be movable up and down.
Specifically, as shown in FIGS. 2 and 3, the link mechanism 380 has a top link 381 and a pair of left and right lower links 382 whose front end portions are rotatably connected to the vehicle main body of the working vehicle. ing.
A rear end portion of the top link 381 is rotatably connected to the upper link frame 301c, and a rear end portion of the pair of lower links 382 is rotatably connected to the pair of lower link frames 301d. Yes.

  The tilling shaft 305 is supported by the chain case 301e and the bearing plate 301f so as to be rotatable about its axis in a state along the width direction of the machine body, and the gear box 301a, the one main beam 301b, and the chain case 301e. It is rotationally driven around the axis by the rotational power transmitted through the internal transmission mechanism.

  The main cover 310 can be rotated around the tilling shaft 305. In the present embodiment, the position of the main cover 310 is adjusted around the tilling shaft 305 by an electric motor 303 (see FIG. 6).

As shown in FIG. 6, the rear cover 311 is connected to the rear end portion of the main cover 310 so that the front end portion can rotate about the pivot shaft 312 along the body width direction.
The rear cover 311 has a rear end pressed against the ground by a pressure reducing spring mechanism 315 so that the soil surface cultivated by the cultivating claws 306 can be leveled.

  The working vehicle 1 can move the working machine 200 up and down, and can tilt in the left-right direction.

  Specifically, as shown in FIG. 5, the work vehicle 1 is provided with a lift actuator 270 that raises and lowers the work machine 200 and a tilt actuator 280 that changes the horizontal tilt of the work machine 200. .

  The control device 100 performs operation control of the elevating actuator 270 and the tilting actuator 280 based on an artificial operation signal.

  Specifically, the working vehicle 1 includes a manual lifting operation member 171, a one-touch lifting operation member 172, a lift position setting member 173, and a lifting fine adjustment operation member 174 as the lifting operation member 170.

When the manual elevating operation member 171 is operated, the control device 100 operates the elevating actuator 270 so that the work machine 200 is positioned at a height corresponding to the operation position of the manual elevating operation member 171.
In FIG. 5, reference numeral 171 a is a sensor that detects the operation position of the manual lifting operation member 171, and reference numeral 201 a is a lift sensor that detects the lifting position of the work machine 200.

  When the one-touch lifting operation member 172 is lifted, the control device 100 operates the lifting actuator 270 so that the work machine 200 is lifted to a height set by the lifting position setting member 173.

  Note that reference numeral 172a in FIG. 5 is a sensor that detects an operation state of the one-touch lifting operation member 172, and reference numeral 173a is a sensor that detects a setting position by the ascending position setting member 173.

When the one-touch lifting / lowering operation member 172 is lowered, the control device 100 operates the lifting / lowering actuator 270 so that the work machine 200 is lowered to the lowered position defined by the operation position of the manual lifting / lowering operation member 171. Let
That is, in the present embodiment, the manual elevating operation member 171 also functions as a lowered position setting member.

The raising / lowering fine adjustment operating member 174 can be raised and lowered.
Specifically, the up-and-down fine adjustment operating member 174 takes a raised position when being pushed in the raising direction, and automatically returns to the neutral position when the pushing operation in the raising direction is released, and When the pressing operation is performed in the lowering direction, the lowering position is taken, and when the pressing operation in the lowering direction is released, the position is automatically returned to the neutral position.

The control device 100 operates the raising / lowering actuator 270 so that the work implement 200 is raised and lowered at a predetermined speed while the raising / lowering fine adjustment operating member 174 is being raised and lowered. When the lowering operation is released and the elevating / lowering fine adjustment operating member 174 returns to the neutral position, the elevating / lowering of the work implement 200 is stopped.
In addition, the code | symbol 174a in FIG. 5 is a sensor which detects the operation position of the said raising / lowering fine adjustment operation member 174. FIG.

Furthermore, the working vehicle 1 according to the present embodiment has a plowing automatic mode for raising and lowering the working machine 200.
The plowing depth automatic mode controls the operation of the elevating actuator 270 so that the plowing depth position of the working device 200 detected by the plowing depth sensor 203a becomes the set position set by the plowing depth setting dial 176. Control mode.

The plowing depth automatic mode is switched between the activated state and the released state by the control device 100 in accordance with a manual operation on a plowing depth automatic switch 175 (see FIG. 5) that can be turned on and off.
Reference numeral 175a in FIG. 5 is a sensor that detects the operating state of the tilling depth automatic switch 175, and reference numeral 176a is a sensor that detects the operating state of the tilling depth setting dial 176.

As shown in FIG. 5, the working vehicle 1 is provided with a tilting operation member 180, and the working machine 200 is tilted in the left-right direction in response to an artificial operation on the tilting operation member 180. The control device 100 controls the operation of the tilt actuator 280.
In FIG. 5, reference numeral 180 a is a sensor that detects the operation position of the tilt operation member 180, and reference numeral 202 a is an inclination sensor that detects the inclination of the working machine 200.

Furthermore, the work vehicle 1 according to the present embodiment has an automatic tilt mode with respect to the tilt of the work implement 200.
The automatic tilt mode is a control mode in which the operation of the tilt actuator 280 is controlled so that the horizontal tilt of the working device 200 detected by the tilt sensor 202a becomes the tilt set by the tilt setting dial 186. It is.

In the automatic tilt mode, the control device 100 switches between an activated state and a released state in response to a manual operation on an automatic tilt switch 185 (see FIG. 5) that can be turned on and off.
Reference numeral 185 a in FIG. 5 is a sensor that detects the operation state of the tilt automatic switch 185, and reference numeral 186 a is a sensor that detects the operation state of the tilt setting dial 186.

Here, a display device provided in the working vehicle 1 according to the present embodiment will be described.
As shown in FIGS. 3 and 5, the working vehicle 1 according to the present embodiment is disposed in front of the driver's seat 15 as a display device that displays various information so that the driver can visually recognize the information. A meter panel 400 and a sub-display 450 disposed on the side of the driver's seat.

FIG. 8 shows a schematic diagram of the meter panel 400.
As shown in FIG. 8, the meter panel 400 includes a tachometer 405 that displays the rotational speed of the engine 50, a plurality of display lamps 410 that display whether or not various control modes included in the work vehicle 1 are activated, And a liquid crystal display unit 420.

  As shown in FIG. 8, the liquid crystal display unit 420 includes a neutral display area 421 that indicates whether or not the forward / reverse switching device 62 is in a neutral state, and a remaining fuel display area that displays the remaining amount of the fuel tank 41. 422, a water temperature display area 423 for displaying the temperature of the engine cooling water, and a display switching area 425 for sequentially switching and displaying a plurality of pieces of information in accordance with an artificial operation by the operator.

Specifically, as shown in FIG. 5, the work vehicle 1 is provided with a display switching operation member 430.
In response to an operation on the display switching operation member 430, the control device 100 displays the display state of the display switching area 425, the total operating time of the engine 50, and the operating time after resetting of the engine 50. Display state (see FIG. 9 (a)), traveling vehicle speed, selected traveling mode, and engine speed upper limit value and maximum speed value set by the traveling mode (see FIG. 9 (b)). ), And an engine load display state (see FIG. 9C) for displaying the traveling vehicle speed, the selected traveling mode, and the engine load factor.

  When the PTO on / off operation member 160 is turned on, the control device 100 displays the traveling vehicle speed, the selected traveling mode, and the PTO rotation speed as the display state of the display switching area. A rotation speed display state (see FIG. 9D) is added.

The operating time of the engine 50 is measured based on the output of a timer provided in the control device 100.
Specifically, the control device 100 detects the operation and stop of the engine 50 based on a signal from the engine speed sensor 50a, and sets the time during which the engine speed exceeds a predetermined speed as the output of the timer. Based on the total engine operating time.

  Further, when the control device 100 inputs a reset signal in response to a manual operation to a reset member 435 (see FIG. 5) provided in the work vehicle 1, the engine speed is set to a predetermined speed after the reset signal is input. Is accumulated as the operation time after reset based on the timer output.

The engine load factor is calculated using, for example, relational data between the fuel injection amount and the engine speed that is provided in the control device 100 in advance.
That is, the control device 100 obtains the maximum fuel injection amount and the no-load fuel injection amount at the engine speed from the measured engine speed and the relational data input from the engine speed sensor 50a.

  Then, the control device 100 calculates the ratio of the deviation between the actual fuel injection amount and the no-load fuel injection amount to the deviation between the maximum fuel injection amount and the no-load fuel injection amount as the engine load factor.

  The sub-display 480 has a liquid crystal display unit and displays various information so as to be visible.

Here, the interrupt display function provided in the working vehicle 1 according to the present embodiment will be described.
The control device 100 displays the display when an operation member registered in advance as an interrupt display target (hereinafter referred to as a display target operation member) among various operation members provided in the work vehicle 1 is operated. In addition to actuating the operation member corresponding to the target operation member, the liquid crystal display unit of the display device is configured to interrupt and display identification information of the operated operation member and operation information indicating its operation state. Yes.

  According to such a configuration, the operator can confirm the type and operation status of the operated operation member with the liquid crystal display unit, so that the operation member can be directly viewed without being visually recognized. It is possible to grasp the operation state and the operation state without directly viewing the operation state of the member that is operated according to the operation, thereby improving the operability of the operator.

  As the liquid crystal display unit, the display switching region 425 of the liquid crystal display unit 420 in the meter panel 400 and / or the liquid crystal display unit in the sub display 450 can be used.

FIG. 10 shows an interrupt display control flow.
The control device 100 activates the interrupt display control mode in response to the main power supply of the work vehicle 1 being turned on.

  The control device 100 detects whether or not the operation member is operated based on input signals from various sensors (step S1).

  When it is detected in step S1 that any one of the various operation members has been operated, the control device 100 determines whether the operated operation member is a display target operation member registered in advance. Is determined (step S2).

Here, the advance registration of the display target operation member can be configured, for example, so that the operator can arbitrarily perform the registration.
That is, as shown in FIG. 5, a display target registration operation member 480 for registering the display target operation member in the work vehicle 1 is provided, and the control device 100 is selected by the display target registration operation member 480. The operation member may be configured to be updated and stored as the display target operation member.
The information on the display target operation member can be stored in, for example, an EEPROM that is not lost and can be rewritten even when the power is turned off.

  According to such a configuration, it is possible to appropriately notify the operator of necessary operation information in accordance with various changes in the traveling state and working state of the working vehicle 1.

  In the case of YES in step S2, that is, when the operated operation member is a display target operation member, the control device 100 displays the identification information of the operated operation member and the operation member on the liquid crystal display unit. The operation state is displayed as an interrupt (step S3).

FIG. 11 shows an example of interrupt display on the liquid crystal display unit.
In the example shown in FIG. 11, the identification information of the operation member is displayed in the identification information display area 461 of the liquid crystal display unit using a symbol indicating the operation member, and the operation state is displayed in the operation state display area 462. Further, the operable range of the operating member and the current operating position with respect to the operable range are displayed in analog form in a bar graph format.

  When the identification information and the operation state of the operation member are interrupted and displayed on the liquid crystal display unit in step S3, the control device 100 starts a timer count (step S4) and returns to the process of step S1.

  In the case of NO in step S1 or NO in step S2, the control device 100 determines whether or not the time when the measurement is started in step S4 (that is, the time after the start of the interrupt display) has passed a predetermined time. Is determined (step S11).

  If YES in step S11, that is, if the interrupt display has passed a predetermined time, the control device 100 returns the liquid crystal display unit to the original display state before the interrupt display (step S13).

If NO in step S11, that is, if the interrupt display has not passed the predetermined time, the control device 100 determines whether or not an artificial signal for canceling the interrupt display is input (step S12). .
The artificial signal for canceling the interrupt display is generated by, for example, a manual operation on the interrupt display canceling member 490 (see FIG. 5) provided in the work vehicle 1.

If YES in step S12, that is, if an artificial signal for canceling the interrupt display is input, the control device 100 returns the liquid crystal display unit to the original display state before the interrupt display (step S13).
On the other hand, in the case of NO in step S12, the control device 100 returns to the process of step S1.

1 Working vehicle
40 fuel injector
50 engine
60 traveling system transmission structure
61 HST (Main transmission)
80 PTO transmission structure
95 PTO axis 100 controller
110 Engine speed changing operation member
120 Main transmission operation member 400 Meter panel (display device)
420 Liquid crystal display unit 425 Display switching area (liquid crystal display unit)
450 Sub-display (display device)
480 Display target registration operation member
510 Engine speed upper limit setting member
515 Highest speed setting member

Claims (4)

A working vehicle comprising a plurality of operating members, a plurality of operating members, a display device having a liquid crystal display unit, and a control device for controlling the operating members and the display device,
When one operation member of the plurality of operation members is operated, the control device changes the operation member corresponding to the one operation member according to the operation state of the operated one operation member. In the case where the operated one operating member is a display target operating member registered in advance as an interrupt display target, the liquid crystal display unit displays identification information of the operated one operating member and It is configured to display the operation status as an interrupt ,
The work vehicle includes a display target registration operation member for registering an arbitrary operation member of the plurality of operation members as the display target operation member.
The control device updates and stores an operation member selected by the display target registration operation member as the display target operation member .   The control device returns the liquid crystal display unit to the original display state when a predetermined time has elapsed after the identification information and the operation state are interrupted and displayed on the liquid crystal display unit or when a predetermined interrupt display canceling operation is performed. The working vehicle according to claim 1, wherein the working vehicle is returned.   The control device displays an operable range of the one operating member and a current operating position with respect to the operable range as the operation state displayed on the liquid crystal display unit. 2. The working vehicle according to 2. An engine, a fuel injection device, a traveling system transmission structure that transmits rotational power from the engine to drive wheels via a main transmission, a PTO shaft that outputs rotational power to the outside, and rotation from the engine A PTO transmission structure that transmits power to the PTO shaft, an engine speed changing operation member, a main speed change operating member, an engine speed upper limit setting member, and a maximum speed setting member;
The control device is configured to output the engine in a state where a target engine speed when the engine speed changing operation member is maximum operated is limited to an engine speed upper limit value set by the engine speed upper limit setting member. The main transmission device when the operation control of the fuel injection device is performed and the main transmission operation member is operated to the maximum so that the rotation number becomes a rotation number corresponding to the operation position of the engine rotation number change operation member In a state where the maximum output rotation speed of the main transmission is limited to the rotation speed set by the maximum speed setting member, the output rotation speed of the main transmission is changed according to the operation position of the main transmission operation member. While controlling the operation of the speed change actuator, the engine speed upper limit value set by the engine speed upper limit setting member and the maximum speed setting member are set. The running mode is bounded by a combination of the maximum speed value plurality, and stores to be, that is configured so as either to activate one running mode of the plurality of traveling modes in response to a command by manual operation The working vehicle according to any one of claims 1 to 3, wherein