Work vehicle

Abstract

The present invention makes it possible to suitably ascertain the state of a work vehicle.　A work vehicle (1) comprises a display device (32) that displays state information (60), which indicates a state of a vehicle (X), wherein the display device (32) superimposes and displays the shape (50, 80, 90) of the vehicle (X) and the state information (60). The display device (32) displays a graphic of an apparatus (Y) included in the vehicle (X) and, at the position at which the apparatus (Y) is displayed, superimposes and displays state information (60) which indicates a state of the apparatus (Y).

Description

Work vehicles

[0001] The present invention relates to a work vehicle equipped with a fuel cell.

[0002] For example, Patent Document 1 discloses a work machine equipped with a fuel cell. This work machine includes a fuel cell, a drive motor, and a battery that stores surplus electricity from the fuel cell and supplies power to the electric motor.

[0003] Japanese Patent Publication No. 2023-13186

[0004] However, although the invention of Patent Document 1 discloses the configuration of a work machine driven by a fuel cell or the like, it does not include a configuration for displaying the state of the work machine.

[0005] The present invention has been made to solve the problems of the prior art, and has an object to provide a work vehicle that can appropriately grasp the state of the vehicle.

[0006] A work vehicle according to one aspect of the present invention is a work vehicle equipped with a display device that displays status information indicating the status of the vehicle, and the display device displays the shape of the vehicle and the status information in a superimposed manner.

[0007] The display device may display a graphic of a device included in the vehicle, and may superimpose status information indicating a status of the device at the position of the displayed device.

[0008] The equipment may be at least one of a tank for storing gas, a fuel cell to which gas is supplied from the tank, an electric motor driven by electricity generated by the fuel cell, and a power storage device for storing the electricity generated by the fuel cell.

[0009] The work vehicle is equipped with a tank arranged on top of the vehicle and storing gas, and a fuel cell to which gas is supplied from the tank, and the display device may display a graphic representing the shape of the vehicle, and may display the tank at the position where the tank is located in the displayed graphic, and may display status information of the tank at the position where the tank is displayed.

[0010] The work vehicle is equipped with a tank for storing gas and a fuel cell arranged at the front of the vehicle and supplied with gas from the tank, and the display device may display a graphic representing the shape of the vehicle, and may display the fuel cell at the position where the fuel cell is arranged in the displayed graphic, and may display status information of the fuel cell at the position where the fuel cell is displayed.

[0011] The work vehicle may be equipped with an electric motor driven by electricity generated by a fuel cell, and the display device may display a graphic representing the shape of the vehicle, and may display the electric motor at the position where the electric motor is located in the displayed graphic, and may display status information of the electric motor at the position where the electric motor is displayed.

[0012] The shape of the vehicle may be displayed in two or three dimensions.

[0013] The work vehicle may be equipped with an inclination angle sensor that detects the inclination angle of the vehicle, and the display device may display, together with the shape and status information of the vehicle, an attitude display unit that rotates in accordance with the inclination angle detected by the inclination angle sensor.

[0014] A work vehicle according to one aspect of the present invention comprises a fuel cell, an electric motor driven by power generated by the fuel cell, a power storage device capable of storing the power generated by the fuel cell and supplying the power to the electric motor, and a display device that displays a first power generated by the fuel cell and a second power related to the power storage device in the same units.

[0015] The display device may display the output of the electric motor in the same unit.

[0016] The display device may display the electric power supplied to the power storage device and the electric power output from the power storage device as the second electric power.

[0017] The display device may display a shape of the vehicle together with the first power and the second power, and may superimpose status information indicating a status of the vehicle on the shape of the vehicle.

[0018] According to the present invention, an operator can appropriately grasp the condition of a vehicle.

[0019] FIG. 1 is an overall side view of a work vehicle. FIG. 2 is a block diagram showing an outline of the configuration of a work vehicle. FIG. 3 is a diagram showing an example of a start-up screen. FIG. 4 is a diagram showing an example of a main display screen. FIG. 5 is a diagram showing an example of a first detailed display screen. FIG. 6 is a diagram showing an example of a management screen. FIG. 7 is a diagram showing an example of a menu screen. FIG. 8 is a diagram showing screen transitions of a display device. FIG. 9 is a diagram showing an example of a first attitude figure display. FIG. 10 is a diagram showing an example of a second attitude figure display. FIG. 11 is a diagram showing an example of a route figure display. FIG. 12 is a diagram showing another example of a route figure display. FIG. 13 is a diagram showing an example of a power storage device figure display. FIG. 14 is a diagram showing an example of a second detailed management screen.

[0020] A work vehicle 1 according to an embodiment of the present invention will be described below with reference to the drawings.

[0021] Fig. 1 is an overall side view of a work vehicle 1. Fig. 2 is a block diagram showing an outline of the configuration of the work vehicle 1. In the example shown in Fig. 1, the work vehicle 1 is a tractor to which a work implement according to the purpose and use of agricultural work is coupled. Note that the work vehicle 1 is not limited to a tractor, and may be an agricultural machine (agricultural vehicle) such as a combine harvester or transplanter, or a construction machine (construction vehicle) such as a backhoe or loader.

[0022] As shown in Figure 1, the work vehicle 1 includes a vehicle body 2, an electric motor 4, a transmission 5, and a traveling device 7. In this embodiment, the work vehicle 1 also includes a power generation system (hereinafter sometimes referred to as an FC system) that uses gas to generate power with a fuel cell 13. In the following description, the configuration of the work vehicle 1 that includes the electric motor 4, transmission 5, traveling device 7, and FC system provided on the vehicle body 2 will sometimes be referred to as "vehicle X." Furthermore, the electric motor 4, transmission 5, traveling device 7, power generation system, etc. provided on the vehicle body 2, as well as the individual devices and electrical equipment that make up these, will sometimes be referred to as "equipment Y."

[0023] A protection mechanism 9 is provided in the vehicle body 2, and a driver's seat 10 is provided within the protection mechanism 9. In the following description, the front side of a driver seated in the driver's seat 10 (the direction of arrow A1 in FIG. 1 ) will be referred to as the front, the rear side of the driver (the direction of arrow A2 in FIG. 1 ) as the rear, the left side of the driver (the front side in FIG. 1 ) as the left side, and the right side of the driver (the back side in FIG. 1 ) as the right side.

[0024] The traveling device 7 is a device having rotating wheels (front wheels 7F and rear wheels 7R). The front wheels 7F may be of a tire type or a crawler type. The rear wheels 7R may also be of a tire type or a crawler type.

[0025] The electric motor 4 is driven by the power generated by the fuel cell 13. The electric motor 4 is, for example, an electric motor configured as a three-phase AC synchronous motor with embedded permanent magnets. The electric motor 4 is supported below the vehicle body 2. The power of the electric motor 4 is transmitted to the traveling device 7 via a transmission 5 and the like. The transmission 5 can switch the propulsive force of the traveling device 7 by changing gears, and can also switch the traveling device 7 between forward and reverse. The transmission 5 has a plurality of gears that transmit power, a shifter that changes the connection of the gears, a clutch that switches between power transmission and disconnection, and the like, and performs the gear change operation by these.

[0026] A control device 11 (FIG. 2) for operating the work vehicle 1 is provided around the driver's seat 10. The control device 11 includes a steering wheel, an accelerator pedal, a brake pedal, a gear shift lever, a starter switch, and the like.

[0027] A coupling device 8 is provided at the rear of the vehicle body 2. The coupling device 8 is configured with a three-point link mechanism or the like. A working implement can be attached and detached to the coupling device 8. The work vehicle 1 can tow the working implement by coupling the working implement to the coupling device 8 and traveling using the traveling device 7. In addition, the coupling device 8 can raise and lower the working implement and change its position by being driven by an actuator (e.g., a hydraulic cylinder).

[0028] The work vehicle 1 is equipped with an inclination angle sensor S1. The inclination angle sensor S1 includes a gyro sensor or an acceleration sensor, and detects the roll angle, pitch angle, yaw angle, and the like of the work vehicle 1 (body 2). In this embodiment, the inclination angle sensor S1 detects the left and right inclination attitude (roll angle of the body 2) and the front and rear inclination attitude (pitch angle of the body 2) of the work vehicle 1 relative to a horizontal state. For example, as shown in FIG. 1 , the inclination angle sensor S1 is provided in the front part of the body 2. Note that the inclination angle sensor S1 may be disposed below a protection mechanism 9 (driver's seat 10) provided in the body 2 or above the protection mechanism 9 (inside the roof), and the placement position is not limited to the example described above.

[0029] The FC system is described in detail below. The FC system includes a tank 12 that stores gas, a fuel cell 13 that receives gas from the tank 12, and an electricity storage device 14 that stores the electricity generated by the fuel cell 13.

[0030] The tank 12 contains (stores) gas to be supplied to the fuel cell 13. In this embodiment, the fuel cell 13 generates electricity by reacting hydrogen with oxygen in the air. In this embodiment, the tank 12 stores hydrogen (hydrogen gas) as the gas. Note that the tank 12 may also store methane gas as the gas. The tank 12 is disposed above the vehicle body 2. The vehicle body 2 supports a storage case 15 that stores the tank 12 above the protection mechanism 9 via a frame 16. Note that the tank 12 may be a tank unit composed of multiple containers.

[0031] The fuel cell 13 is disposed in the front part of the vehicle body 2. For example, as shown in FIG. 1 , the fuel cell 13 is disposed forward of a protection mechanism 9 provided in the vehicle body 2. The fuel cell 13 is housed inside a hood (housing) provided in the front part of the vehicle body 2.

[0032] The power storage device 14 is a secondary battery capable of storing electricity. The power storage device 14 is electrically connected to the fuel cell 13. The power storage device 14 is also electrically connected to the electric motor 4. As a result, the power storage device 14 stores electric power from the fuel cell 13 and supplies the stored electric power to the electric motor 4 and the like. The power storage device 14 is mounted on the vehicle body 2. For example, as shown in FIG. 1 , the power storage device 14 is disposed below the protection mechanism 9 and behind the fuel cell 13. Note that the position of the power storage device 14 is not limited to the example shown in FIG. 1 , and it may be housed in the hood and disposed adjacent to the fuel cell 13, for example.

[0033] As shown in Figure 2, the work vehicle 1 has a pressure reducing unit 18 that reduces the pressure in the tank 12, and a supply pipe 19 that connects the tank 12 to the fuel cell 13. The pressure reducing unit 18 is, for example, a release valve, and reduces the pressure of the gas in the tank 12 by releasing the gas (air) in the tank 12 to the outside. The gas in the tank 12 is discharged to the supply pipe 19 by the pressure reducing unit 18. That is, the gas in the tank 12 is supplied to the fuel cell 13 via the pressure reducing unit 18 and the supply pipe 19.

[0034] The work vehicle 1 has a filling pipe 20 for filling the tank 12 with gas, a flow path switching valve V1, and a connection device 17. The connection device 17 is provided, for example, at the rear of the vehicle body 2 ( FIG. 1 ), and is connected to external gas storage equipment via a connection nozzle. The flow path switching valve V1 switches the gas flow path between the supply pipe 19 and the filling pipe 20. By switching the flow path using the flow path switching valve V1, it is possible to switch between a state in which the tank 12 and the filling pipe 20 are connected to each other while the communication between the tank 12 and the supply pipe 19 is blocked (a state in which the tank 12 is filled with gas), and a state in which the communication between the tank 12 and the filling pipe 20 is blocked while the communication between the tank 12 and the supply pipe 19 is connected (a state in which gas is supplied from the tank 12 to the fuel cell 13).

[0035] As shown in FIG. 2 , the work vehicle 1 is equipped with a control device 31. The control device 31 is a controller for the work vehicle 1 and performs various controls related to the work vehicle 1. The control device 31 has a processor 31a and a memory 31b. The processor 31a is, for example, a CPU (Central Processing Unit). The memory 31b is composed of volatile or non-volatile memory, etc. The memory 31b includes, for example, an SSD (Solid State Drive) or an HDD (Hard Disk Drive). The memory 31b of the control device 31 stores programs and various data in a readable and writable manner for the control device 31 to control the operation of each part of the work vehicle 1. The functions of the control device 31 are realized by the processor 31a reading and executing the programs from the memory 31b.

[0036] Note that some or all of the configuration of the control device 31 may be realized by hardware (processing circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by cooperation between a program (software) and hardware.

[0037] The control device 31 is communicably connected to a plurality of devices mounted on the work vehicle 1 via an in-vehicle network N such as CAN, ISOBUS, LIN, or FlexRay. For example, the control device 31 controls the operation of each part of the work vehicle 1 as shown in Figures 1 and 2.

[0038] As shown in FIG. 2, the work vehicle 1 is equipped with a first radiator HE1, a second radiator HE2, an inverter 21, a junction box 22, a DC-DC converter 23, and a low-voltage battery 24.

[0039] The first radiator HE1 exchanges heat between the coolant that cools the fuel cell 13 and air (cooling wind). The second radiator HE2 exchanges heat between the coolant that cools the power storage device 14 and air (cooling wind).

[0040] The inverter 21 is a motor drive device that supplies power from the fuel cell 13 or the power storage device 14 to the electric motor 4 to drive the electric motor 4. The inverter 21 is electrically connected to the electric motor 4 and the junction box 22. The inverter 21 converts DC power input from the fuel cell 13 or the power storage device 14 via the junction box 22 into three-phase AC power and supplies the three-phase AC power to the electric motor 4. This drives the electric motor 4. The inverter 21 can also arbitrarily adjust the current and voltage of the power supplied to the electric motor 4. The control device 31 controls the operation of the inverter 21 to drive or stop the electric motor 4.

[0041] In addition to the inverter 21, the junction box 22 is electrically connected to the fuel cell 13, the power storage device 14, and the DC-DC converter 23. The junction box 22 outputs the power output from the fuel cell 13 or the power storage device 14 to the inverter 21 or the DC-DC converter 23. The control device 31 controls the opening and closing of a relay provided inside the junction box 22 to switch the power supply destination and source.

[0042] For example, the control device 31 can switch between a state (first state) in which the power supply source is the fuel cell 13 and the power supply destinations include the power storage device 14 and the inverter 21 (electric motor 4), a state (second state) in which the power supply source is the fuel cell 13 and the power storage device 14 and the power supply destinations include the inverter 21 (electric motor 4), and a state (third state) in which the power supply source is the power storage device 14 and the power supply destinations include the inverter 21 (electric motor 4). That is, in the first state, the electric motor 4 is driven by power supplied from the fuel cell 13, and the power storage device 14 does not supply power to the electric motor 4. In the second state, the electric motor 4 is driven by power supplied from the fuel cell 13 and the power storage device 14. In the third state, the electric motor 4 is driven by power supplied from the power storage device 14, and the fuel cell 13 does not supply power to the electric motor 4.

[0043] For example, the control device 31 can automatically switch between any one of the first, second, and third states depending on the remaining capacity of the tank 12, the state of the fuel cell 13, the charging rate of the power storage device 14, etc. Specifically, if the charging rate of the power storage device 14 is lower than a predetermined value, the control device 31 switches to the first state. If the power output by the fuel cell 13 is lower than a predetermined value and if the target output of the electric motor 4 is higher than a predetermined value, the control device 31 switches to the second state. If the remaining capacity of the tank 12 is lower than a predetermined value, the control device 31 switches to the third state.

[0044] The control device 31 may perform switching based on the operation of the control device 11 by the operator, and the method of switching the power supply source and supply destination is not limited to the example described above.

[0045] The DC-DC converter 23 is a voltage conversion device that converts the voltage of the direct current input from the fuel cell 13 and / or the power storage device 14 via the junction box 22 into a different voltage. In this embodiment, the DC-DC converter 23 is a step-down converter that converts the high voltage of the fuel cell 13 or the power storage device 14 into a predetermined low voltage that is appropriate for the electrical equipment provided in the work vehicle 1. The DC-DC converter 23 supplies power to the low-voltage battery 24 after voltage conversion. The electrical equipment includes, for example, the control device 31, the display device 32, and the fan motor of the first radiator HE1.

[0046] The power storage device 14 includes a plurality of battery modules, such as lead batteries or lithium ion batteries, each including a plurality of battery cells (lithium ion batteries) electrically connected (in series), and a battery case that houses the plurality of battery modules. That is, the power storage device 14 is a battery pack in which the plurality of battery modules are housed in a battery case and the plurality of battery modules are electrically connected (in series, for example).

[0047] The power storage device 14 is also provided with a BMU (battery management unit) 14a. In the example shown in Fig. 2, the BMU 14a is provided inside the power storage device 14, but the BMU 14a may be built into the power storage device 14 or may be provided outside the power storage device 14. Furthermore, the battery monitoring function may be included in the control device 31.

[0048] The BMU 14a monitors and controls the power storage device 14. Specifically, the BMU 14a controls the opening and closing of a relay provided inside the power storage device 14 to control the start and stop of power supply from the power storage device 14. The BMU 14a also detects the temperature, current, voltage, terminal voltage of the internal battery cells, etc. of the power storage device 14.

[0049] Specifically, for example, the BMU 14a detects the temperature of the power storage device 14 based on signals detected by a plurality of temperature detection devices 14b to 14d provided in the power storage device 14. In this embodiment, the power storage device 14 includes a plurality of battery cells, and the plurality of temperature detection devices 14b to 14d are provided in different battery cells. In this embodiment, an example has been described in which the power storage device 14 is provided with three temperature detection devices, but the number of temperature detection devices provided in the power storage device 14 is not limited to three.

[0050] The BMU 14a detects the power (charge power) supplied to the power storage device 14 and the power (discharge power) output from the power storage device 14. In the following description, the charge power and discharge power of the power storage device 14 may be referred to as second power.

[0051] Furthermore, the BMU 14a detects the remaining capacity of the power storage device 14 by a voltage measurement method, for example, based on the terminal voltage of the cells inside the power storage device 14. Note that the method for detecting the remaining capacity of the power storage device 14 is not limited to the voltage measurement method, and other methods such as a coulomb counter method, a cell modeling method, an impedance track method, etc. Also, a capacity detection unit that detects the remaining capacity of the power storage device 14 may be provided separately from the BMU 14a.

[0052] As shown in FIG. 2 , the work vehicle 1 is equipped with one or more detection devices that detect the state of vehicle X (equipment Y). In this embodiment, the work vehicle 1 is equipped with a first detection device 41, a second detection device 42, and a third detection device 43 (hereinafter, the first detection device 41, the second detection device 42, and the third detection device 43 may be collectively referred to simply as detection devices 41 to 43). The detection devices 41 to 43 include various sensors installed in each section and a computing unit. The computing units of the detection devices 41 to 43 detect (calculate) the state of the work vehicle 1 based on output signals from the various sensors. The detection devices 41 to 43 may be programs stored in memory 31b, and the processor 31a of the control device 31 may calculate the state of each section of the work vehicle 1 by running the above programs.

[0053] The first detection device 41 detects a state related to the gas in the tank 12. The first detection device 41 may include a pressure sensor 41a that measures the pressure of the gas in the tank 12 and a temperature sensor 41b that measures the temperature in the tank 12. Note that the pressure sensor 41a and the temperature sensor 41b may be provided in different containers of the tank 12.

[0054] The first detection device 41 may include a remaining gas amount calculation unit 41c that calculates the remaining amount of gas in the tank 12. The remaining amount of gas in the tank 12 can be calculated based on the pressure of the tank 12 detected by the pressure sensor 41a. The remaining amount of gas and the pressure of the tank 12 are correlated. For this reason, the remaining gas amount calculation unit 41c calculates the remaining amount of gas, for example, by referring to a map that is stored in advance in the memory 31b and that associates the gas pressure with the remaining amount of gas. As another example, a program that expresses the relationship between the gas pressure and the remaining amount of gas as a function may be stored in the memory 31b.

[0055] The first detection device 41 may also include a pressure sensor 41d that measures the pressure of the gas decompressed in the pressure reducing section 18 that is released to the fuel cell 13, and an open detection sensor 41e that detects whether the lid of the connection device 17 that supplies gas to the tank 12 is open or not.

[0056] The second detection device 42 detects the state of the fuel cell 13. For example, the second detection device 42 includes a first power detection unit 42a that detects the first power generated (output) by the fuel cell 13. The second detection device 42 may also include a water temperature sensor 42b that measures the temperature of the coolant in the first radiator HE1 that cools the fuel cell 13. The second detection device 42 may also include an integrated value calculation unit 42c that integrates the first power generated by the fuel cell 13. The integrated value calculation unit 42c can calculate the total power generated by the fuel cell 13 by integrating the first power detected by the first power detection unit 42a.

[0057] Furthermore, the second detection device 42 may include a power upper limit calculation unit 42d. The upper limit of the power that the fuel cell 13 can generate (output) can be calculated based on the coolant temperature detected by the water temperature sensor 42b. For this reason, the power upper limit calculation unit 42d calculates the upper limit of the power of the fuel cell 13, for example, by referring to a map that is stored in advance in the memory 31b and that associates the power that the fuel cell 13 can output with the coolant temperature. As another example, the memory 31b may store a program that expresses the relationship between the power that the fuel cell 13 can output and the coolant temperature as a function.

[0058] The third detection device 43 detects the state of the electric motor 4. For example, the third detection device 43 includes a torque detection unit 43a that measures the torque output by the electric motor 4, a rotation sensor 43b that measures the actual rotation speed of the electric motor 4, and a command value detection unit 43c that detects a command value of the rotation speed instructed to the electric motor 4 (inverter 21).

[0059] The third detection device 43 may also include an output calculation unit 44d that calculates the output of the electric motor 4. The output of the electric motor 4 can be calculated from the torque and rotation speed of the electric motor. For this reason, a program that expresses the relationship between the torque, rotation speed, and output of the electric motor 4 as a function is stored in the memory 31b, and the output calculation unit 44d (processor 31a) executes the program to detect the output of the electric motor 4.

[0060] 2, the control device 31 may have an abnormality detection unit 31c that detects preset warning information. The abnormality detection unit 31c detects, for example, an abnormality (failure) of equipment Y mounted on the work vehicle 1 as warning information. The abnormality detection unit 31c is a program stored in the memory 31b, and the processor 31a of the control device 31 calculates the program to detect abnormalities in each part of the work vehicle 1.

[0061] When a value output from electronic components such as the detection devices 41 to 43 exceeds a predetermined threshold range, the abnormality detection unit 31c determines that a warning event has occurred in the work vehicle 1. For example, when a value output from a water temperature sensor 42b that detects the temperature of the cooling water that cools the fuel cell 13 exceeds a predetermined range, the abnormality detection unit 31c detects an abnormality (overheating) of the fuel cell 13 as warning information.

[0062] The warning information detected by the abnormality detection unit 31c is input to the control device 31. The warning information includes, for example, an error code indicating the type of warning and the time when the warning occurred. The memory 31b stores a table that associates error codes with the location of a warning event corresponding to the error code (hereinafter simply referred to as the location), and a message corresponding to the error code. In this embodiment, the location of the warning event can be one related to the fuel cell 13 (EV) or the power storage device 14 (FC). When the warning information is input, the control device 31 references the table and obtains the location and message corresponding to the input error code. The control device 31 stores the error code, the time when the warning occurred, the location, and the message in a database DB on the memory 31b.

[0063] As shown in Fig. 2, the work vehicle 1 is equipped with a display device 32 and an input device 33. The display device 32 is a device that displays various information related to the work vehicle 1. The display device 32 is, for example, a liquid crystal display or an organic EL display. As shown in Fig. 2, the control device 31 has a display control unit 31d for controlling the display device 32. The control device 31 functions as the display control unit 31d, for example, by the processor 31a executing a display control program stored in the memory 31b. The display control unit 31d may also be configured as hardware formed on an integrated circuit (IC chip) or the like.

[0064] The display control unit 31d has a function of controlling the display screen G displayed by the display device 32. For example, the display control unit 31d causes the display device 32 to display status information 60 indicating the status of the work vehicle 1. For example, the display device 32 displays the status information 60 indicating the status of the work vehicle 1 based on an instruction signal from the display control unit 31d.

[0065] The input device 33 is an interface for operating the display device 32. The worker (operator) can switch the display on the display screen G of the display device 32 by operating the input device 33. For example, the input device 33 according to this embodiment employs a touch panel provided on the display device 32, and is capable of detecting touch operations on the display device 32.

[0066] The input device 33 may be configured with a hardware switch, etc. For example, the operation units B1 to B8 described later may be physical operation tools provided on the display device 32, or may be configured with the operation device 11 provided in the driver's seat 10.

[0067] For example, the input device 33 includes a sensor that detects the position where the operator touches the display device 32, and a driver that calculates (defines) an instruction signal for the display device 32 in accordance with the position detected by the sensor. The driver is a program stored in the memory 31b. When the operator operates (touches) the input device 33, the sensor of the input device 33 detects the position where the operator touched and inputs the detected position to the driver of the input device 33. The driver of the input device 33 defines the instruction signal in accordance with the detected position. After defining the instruction signal, the input device 33 inputs the instruction signal to the display control unit 31d. The display control unit 31d controls switching of the display screen G of the display device 32 based on the instruction signal input by the input device 33. In this embodiment, the display device 32 can display, as the display screen G, a startup screen GS, a main display screen G1, a first detailed display screen G2, a management screen G3, and a menu screen G4.

[0068] The main display screen G1, the first detailed display screen G2, the management screen G3, and the menu screen G4 may be collectively referred to as "display screens." The first detailed display screen G2 may also be simply referred to as the "detailed display screen."

[0069] Furthermore, the display device 32 is only required to be able to display at least one of the main display screen G1, the first detailed display screen G2, and the management screen G3, which show the status of the work vehicle 1, and the display screens G that can be displayed are not limited to the examples described above. The display screens G will be described in detail below.

[0070] FIG. 3 is a diagram showing an example of a startup screen GS. The startup screen GS is a screen indicating that the display device 32 is starting up. FIG. 4 is a diagram showing an example of a main display screen G1. FIG. 5 is a diagram showing an example of a first detailed display screen G2. FIG. 6 is a diagram showing an example of a management screen G3. FIG. 7 is a diagram showing an example of a menu screen G4. As shown in FIGS. 4 to 6, the main display screen G1, the first detailed display screen G2, and the management screen G3 are display screens showing the status of the work vehicle 1. The control device 31 periodically acquires status information 60 of the work vehicle 1 detected by the tilt angle sensor S1, the BMU 14a, the abnormality detection unit 31c, the detection devices 41 to 43, etc. When the control device 31 acquires the status information 60 of the work vehicle 1, it inputs an instruction signal to the display control unit 31d to display the status information 60 of the work vehicle 1. The display control unit 31d causes the display device 32 to display the status information 60 of the work vehicle 1 in accordance with the input instruction signal.

[0071] 4, the display control unit 31d causes the display device 32 to display, as a main display screen G1, the first power generated by the fuel cell 13, the second power related to the power storage device 14, and the output of the electric motor 4. For example, as shown in FIG. 4, on the main display screen G1, the first power, the second power, and the output of the electric motor 4 are displayed in a meter format including a pointer and an index (scale).

[0072] 5, the display control unit 31d causes the display device 32 to display a detailed display screen G2 in which the shape 50 of the vehicle X and the status information 60 (61 to 64) are superimposed on each other. In the detailed display screen G2, the status information 60 is displayed mainly in a numerical format.

[0073] 6, the display control unit 31d displays, as a management screen G3, detailed information related to a warning for the work vehicle 1. In detail, the warning information stored in the database DB of the memory 31b is subjected to predetermined processing by the display control unit 31d and displayed on the management screen G3.

[0074] As shown in Figures 4 to 6, operation units B1 to B3 are displayed on the display screens G1 to G3, respectively, to accept an operation to switch the display to the menu screen G4. For example, as shown in Figure 4, the operation unit B1 is displayed above and to the right of the main display screen G1. As shown in Figure 5, the operation unit B2 is displayed above and to the right of the detailed display screen G2. As shown in Figure 6, the operation unit B3 is displayed above and to the right of the menu screen G4.

[0075] As shown in Fig. 7, the menu screen G4 shows a display menu. On the menu screen G4, operation units B4 to B6 that accept instructions to switch the display to the display screens G1 to G3 are displayed side by side. Note that the arrangement of the operation units B1 to B6 on the display screens G1 to G4 described above is an example and is not limited to the example shown in Fig. 7.

[0076] The display control unit 31d displays the display screen G on the display device 32. When the worker operates (touches) the operation units B1 to B6, the input device 33 inputs a display instruction signal for the display screens G1 to G4 associated with the operation units B1 to B6 to the display control unit 31d. The display control unit 31d switches the display screens G1 to G4 of the display device 32 based on the display instruction signal.

[0077] 8 is a screen transition diagram of the display device 32. Events E1 to E8 represent triggers that cause the display control unit 31d to transition (switch) the display on the display screen G of the display device 32.

[0078] When the power of the display device 32 is switched from OFF to ON (event E1), the display control unit 31d causes the display device 32 to display the startup screen GS. After a predetermined time has elapsed (event E2), the display control unit 31d causes the display device 32 to display the main display screen G1. The predetermined time is, for example, one second, but the specific value is merely an example and is not limited to this value.

[0079] When the worker operates the operation unit B1 of the main display screen G1 (event E3), the display control unit 31d causes the display device 32 to display the menu screen G4. When the worker operates the operation unit B4 of the menu screen G4 (event E4), the display control unit 31d causes the display device 32 to display the main display screen G1. When the worker operates the operation unit B5 of the menu screen G4 (event E5), the display control unit 31d causes the display device 32 to display the details display screen G2. When the worker operates the operation unit B6 of the menu screen G4 (event E6), the display control unit 31d causes the display device 32 to display the management screen G3. When the worker operates the operation unit B2 of the details display screen G2 (event E7), the display control unit 31d causes the display device 32 to display the menu screen G4. When the worker operates the operation unit B3 of the management screen G3 (event E8), the display control unit 31d causes the display device 32 to display the menu screen G4.

[0080] The display control unit 31d may transition back to the previously displayed display screen G. In this case, when a display instruction signal for display screen G is input, the display control unit 31d displays one of the display screens G1 to G4 and stores in the memory 31b history information correlating the display instruction signal with the time of display control. When the worker operates the operation unit B7 provided on the menu screen G4, for example, as shown in FIG. 7, the input device 33 inputs an instruction signal to the display control unit 31d to display the previously displayed display screen G. The display control unit 31d refers to the history information in the memory 31b based on the input instruction signal. The display control unit 31d identifies the type of the previously displayed display screen G1 to G4 based on the history information and displays the identified display screen G1 to G4 on the display device 32.

[0081] This allows the worker to operate the input device 33 (display device 32) to display and check the status information 60 of the vehicle X on the display device 32.

[0082] The display control unit 31d (control device 31) may also have a function to restrict the display of the display screen G. For example, the memory 31b stores a password and a program for password verification. For example, when an operator performs an operation to display the detailed display screen G2, the display control unit 31d displays a password entry prompt screen. When the operator enters the password, the control device 31 executes the program. When the execution of the program is successful (when the password stored in the memory 31b matches the password entered by the operator), the control device 31 inputs an instruction signal to the display control unit 31d to display the detailed display screen G2. Note that the restriction on the display of the display screen G is not limited to the detailed display screen G2, and may be applied to other display screens G. This allows the control device 31 to restrict the display screen G.

[0083] The display device 32 displays a detailed display screen G2 in which a shape 50 of vehicle X and status information 60 indicating the status of vehicle X are superimposed. Specifically, the display device 32 displays figures 51-54 of equipment Y included in vehicle X, and also displays status information 61-64 indicating the status of equipment Y superimposed on the position of the displayed equipment Y. For example, as shown in FIG. 5 , the display control unit 31d displays a figure indicating the shape 50 of vehicle X in the center of the detailed display screen G2. The shape 50 of vehicle X is a two-dimensional line drawing of the shape of vehicle X (work vehicle 1). Hereinafter, the figure indicating the shape 50 of vehicle X may be referred to as a vehicle figure 50.

[0084] As described above, the tank 12, which is equipment Y, is provided on the upper part of the vehicle body 2 (FIG. 1). As shown in FIG. 5, the display control unit 31d displays a tank graphic 51 representing the tank 12 on the upper part of the vehicle graphic 50. In other words, the position of the tank graphic 51 on the vehicle graphic 50 substantially coincides with the installation position of the tank 12 on the actual vehicle X.

[0085] The display control unit 31d displays status information 61 of the tank 12 at the position where the tank graphic 51 is displayed. The status information 61 of the tank 12 is information about the gas in the tank 12 detected by the first detection device 41 (FIG. 2).

[0086] The display control unit 31d displays, as the status information 61, the pressure of the gas in the tank 12 detected by the pressure sensor 41a to the right of "P:" on the detailed display screen G2. The display control unit 31d displays, as the status information 61, the remaining amount of gas calculated by the remaining gas amount calculation unit 41c to the right of "H2:" on the detailed display screen G2. The display control unit 31d displays, as the status information 61, the minimum value of the temperatures acquired by the multiple temperature sensors 41b provided in the tank 12 to the right of "Tmin:" on the detailed display screen G2. The display control unit 31d displays, as the status information 61, the average value of the temperatures acquired by the multiple temperature sensors 41b provided in the tank 12 to the right of "Tave:" on the detailed display screen G2.

[0087] The display control unit 31d may display information about the gas at a position different from the tank graphic 51. For example, as shown in FIG. 5 , the display control unit 31d displays the gas pressure detected by the pressure sensor 41d provided in the pressure reducing unit 18 superimposed on a graphic 51a separate from the tank graphic 51. The graphic 51a is displayed near a fuel cell graphic 52 representing the fuel cell 13. More specifically, the graphic 51a is displayed between the tank graphic 51 and the fuel cell graphic 52. This allows the operator to intuitively understand, by looking at the display device 32, whether the pressure is the gas pressure in the tank 12 or the pressure of the decompressed gas immediately before being supplied to the fuel cell 13, based on the difference in the display position.

[0088] As described above, the fuel cell 13, which is device Y, is provided in the front of the vehicle body 2 (FIG. 1). As shown in FIG. 5, the display control unit 31d displays a fuel cell graphic 52 representing the fuel cell 13 in front of the vehicle graphic 50. In other words, the position of the fuel cell graphic 52 on the vehicle graphic 50 substantially coincides with the installation position of the fuel cell 13 on the actual vehicle X.

[0089] The display control unit 31d displays status information 62 of the fuel cell 13 at the position where the fuel cell graphic 52 is displayed. The status information 62 of the fuel cell 13 is information about the fuel cell 13 detected by the second detection device 42 (FIG. 2).

[0090] The display control unit 31d displays, as the status information 62, the power generated by the fuel cell 13, obtained by the first power detection unit 42a, to the right of "GEN:" on the detailed display screen G2. The displayed unit of the first power is "kW." The display control unit 31d displays, as the status information 62, the water temperature of the cooling water for the fuel cell 13, obtained by the water temperature sensor 42b, below "CT" on the detailed display screen G2. The display control unit 31d displays, as the status information 62, the integrated value of the power generated by the fuel cell 13, obtained by the integrated value calculation unit 42c, above "kWh" on the detailed display screen G2. The display control unit 31d displays, as the status information 62, the upper limit of the power that can be output by the fuel cell 13, obtained by the power upper limit calculation unit 42d, to the right of "ENB:" on the detailed display screen G2. The displayed unit is "kW."

[0091] The display control unit 31d may superimpose warning information related to the fuel cell 13 on the fuel cell graphic 52. For example, when the abnormality detection unit 31c detects that the temperature of the cooling water that cools the fuel cell 13 is higher than a predetermined temperature, the abnormality detection unit 31c (control device 31) inputs warning information to the display control unit 31d, warning that the fuel cell 13 is at a high temperature. The display control unit 31d displays the warning display unit 52a based on the input warning information. Specifically, as shown in FIG. 5, the display control unit 31d lights up an "H" on the warning display unit 52a, indicating that the fuel cell 13 is at a high temperature.

[0092] Furthermore, when the abnormality detection unit 31c detects that the temperature of the cooling water that cools the fuel cell 13 is lower than a predetermined temperature, the abnormality detection unit 31c (control device 31) inputs warning information to the display control unit 31d, warning that the fuel cell 13 is at a low temperature. The display control unit 31d displays a warning on the warning display unit 52a based on the input warning information. Specifically, as shown in FIG. 5, the display control unit 31d lights up the letter "L" on the warning display unit 52a, indicating that the fuel cell 13 is at a low temperature.

[0093] As described above, the electric motor 4, which is equipment Y, is provided at the rear of the vehicle body 2, and the drive power of the electric motor 4 is transmitted to the traveling device 7, thereby enabling the work vehicle 1 to travel ( FIG. 1 ). As shown in FIG. 5 , the display control unit 31d displays an electric motor graphic 53 representing the electric motor 4 superimposed on the vehicle graphic 50 in a position that evokes the vicinity of the electric motor 4. The display control unit 31d displays status information 63 of the electric motor 4 in the position where the electric motor graphic 53 is displayed. The status information 63 of the electric motor 4 is information about the electric motor 4 detected by the third detection device 43 ( FIG. 2 ).

[0094] The display control unit 31d displays the output of the electric motor 4 acquired by the output calculation unit 44d to the right of "PWR:" on the detailed display screen G2 as the status information 63. The unit system for the displayed output of the electric motor 4 is "kW". The display control unit 31d displays the rotation speed of the electric motor 4 acquired by the rotation sensor 43b to the right of "ACT:" on the detailed display screen G2 as the status information 63. The display control unit 31d displays the command rotation speed of the electric motor 4 acquired by the command value detection unit 43c to the right of "TGT:" on the detailed display screen G2 as the status information 63.

[0095] The display control unit 31d may superimpose warning information related to the electric motor 4 on the electric motor graphic 53. For example, when the abnormality detection unit 31c detects that the operation of the inverter 21 that supplies power to the electric motor 4 has been restricted (the restriction has been turned ON), the abnormality detection unit 31c (control device 31) inputs warning information to the display control unit 31d, warning that the restriction on the inverter 21 has been turned ON. The display control unit 31d displays the warning display unit 53a based on the input warning information. More specifically, as shown in FIG. 5, the display control unit 31d lights up "LIM" on the warning display unit 53a, indicating that the restriction on the inverter 21 is active.

[0096] As described above, the power storage device 14, which is device Y, is provided in the vehicle body 2 (FIG. 1). As shown in FIG. 5, the display control unit 31d displays a power storage device graphic 54 representing the power storage device 14 superimposed on the vehicle graphic 50 at a position that evokes the power storage device 14. The display control unit 31d displays status information 64 of the power storage device 14 at the position where the power storage device graphic 54 is displayed. The status information 64 of the power storage device 14 is information related to the power storage device 14 that is detected by the BMU 14a or the temperature detection devices 14b to 14d (FIG. 2).

[0097] The display control unit 31d displays, as the status information 64, the power (charge power) supplied to the power storage device 14 obtained by the BMU 14a or the power (discharge power) output by the power storage device 14 above the power storage device graphic 54. The units of the displayed charge power and discharge power are "kW."

[0098] The display control unit 31d displays the battery cell temperature in the center of the power storage device graphic 54 as the status information 64. Specifically, the display control unit 31d displays the maximum and minimum values ​​of the battery cell temperatures obtained by the temperature detection devices 14b to 14d side by side. The display control unit 31d displays the battery cell voltage in the center of the power storage device graphic 54 as the status information 64. Specifically, the display control unit 31d displays the maximum and minimum values ​​of the terminal voltage of the battery cells of the power storage device 14 obtained by the BMU 14a side by side. The display control unit 31d displays the remaining capacity of the power storage device 14 in the center of the power storage device graphic 54 as the status information 64. Specifically, the display control unit 31d displays the percentage of the remaining capacity of the power storage device 14 obtained by the BMU 14a. The display control unit 31d displays the voltage of the power storage device 14 (system voltage) below the power storage device graphic 54 as the status information 64. Specifically, the display control unit 31d displays the voltage of the power storage device 14 acquired by the BMU 14a.

[0099] The display device 32 displays the shape 50 and state information 60 of the vehicle X, as well as an attitude display unit 55 that rotates according to the inclination angle detected by the inclination angle sensor S1. The attitude display unit 55 shows the inclination state of the vehicle X with a still image icon. The attitude display unit 55 includes a first attitude graphic 55a, which is a circular icon indicating the front of the vehicle X, and a second attitude graphic 55b, which is a circular icon indicating the side of the vehicle X.

[0100] For example, as shown in FIG. 5, the display control unit 31d displays a first attitude figure 55a on the detailed display screen G2 of the display device 32, and displays a second attitude figure 55b showing the side of the vehicle X below the first attitude figure 55a.

[0101] The display control unit 31d rotates and displays the first attitude graphic 55a in accordance with the roll angle detected by the tilt angle sensor S1, and rotates and displays the second attitude graphic 55b in accordance with the pitch angle detected by the tilt angle sensor S1.

[0102] 9A is a diagram showing an example of the display of the first attitude graphic 55a. The display control unit 31d rotates the first attitude graphic 55a around the center of the first attitude graphic 55a by the roll angle detected by the inclination angle sensor S1. As seen by an operator checking the display device 32, the tilt direction of the vehicle X and the tilt direction of the first attitude graphic 55a coincide. In other words, if the vehicle X is tilting to the left, the vehicle X in the first attitude graphic 55a also tilts to the left, and if the vehicle X is tilting to the right, the vehicle X in the first attitude graphic 55a also tilts to the right. This allows the operator to intuitively understand that the vehicle X (vehicle body 2) is tilting in the left-right direction.

[0103] 9B is a diagram showing an example of the display of the second attitude figure 55b. The display control unit 31d rotates the second attitude figure 55b around the center of the second attitude figure 55b by the pitch angle detected by the tilt angle sensor S1. As seen by an operator checking the display device 32, the tilt direction of the vehicle X and the tilt direction of the second attitude figure 55b coincide. In other words, when the vehicle X is tilted forward, the vehicle X in the second attitude figure 55b also tilts forward, and when the vehicle X is tilted backward, the vehicle X in the second attitude figure 55b also tilts backward. This allows the operator to intuitively understand that the vehicle X (vehicle body 2) is tilting in the fore-and-aft direction.

[0104] 5 and the like, the attitude display unit 55 includes the first attitude graphic 55a representing the front of the vehicle X and the second attitude graphic 55b representing the side of the vehicle X. However, the attitude display unit 55 is not limited to the above example. For example, the first attitude graphic 55a may be a graphic icon representing the rear of the vehicle X instead of the front of the vehicle X.

[0105] Furthermore, in the above example, the attitude display unit 55 has been described as displaying the tilted state of the vehicle X using a still image, but the tilted state of the vehicle X may be displayed using an animation showing the vehicle X tilting.

[0106] The attitude display unit 55 may also include a meter image consisting of a pointer and an index (scale) that indicates the tilt angle value. In this case, the display control unit 31d rotates the pointer so that the tilt angle detected by the tilt angle sensor S1 matches the numerical value of the index (scale). The attitude display unit 55 may also include a numerical image that indicates the tilt angle value.

[0107] The display control unit 31d may also have a function to display the work time (total operating time of the work vehicle 1, hour meter). In particular, the control device 31 has a timer that measures the current date, time, etc., and the current date, time, and work time calculated by the control device 31 are sequentially stored in the memory 31b. The display control unit 31d references information related to the work time stored in the memory 31b, and displays the work time in area 56 of the detailed display screen G2.

[0108] The display control unit 31d may also display warning information on the detailed display screen G2. For example, as shown in Fig. 6, an error code, which is a type of warning information, is displayed in an area 57a of the detailed display screen G2, and information about the location where the warning occurred ("EV SYSTEM" related to the fuel cell 13 and "FC SYSTEM" related to the power storage device 14) is displayed in an area 57b. For example, the display control unit 31d refers to the database DB in the memory 31b to obtain the most recently generated warning information. The display control unit 31d displays the obtained warning information on the detailed display screen G2.

[0109] Specifically, the display control unit 31d displays the error code in the area 57a of the detailed display screen G2. If the acquired warning information has occurred in the fuel cell 13, the display control unit 31d lights up "EV SYSTEM" in the area 57b. If the acquired warning information has occurred in the power storage device 14, the display control unit 31d lights up "EV SYSTEM" in the area 57b.

[0110] 5, the display control unit 31d causes the display device 32 to display the first power generated by the fuel cell 13, the second power related to the power storage device 14, and the output of the electric motor in the same units on the main display screen G1. The display control unit 31d also causes the first power, the second power, and the maximum value of the electric motor to be displayed on the main display screen G1 to be the same value.

[0111] The display control unit 31d displays a meter image 71, which displays the value of the first power detected by the first power detection unit 42a, on one side of the main display screen G1. For example, the meter image 71 has a circular shape. At the bottom of the meter image 71, "FC" is displayed, indicating that the display on the meter image 71 is the first power generated by the fuel cell 13, and "×10 kW" is displayed, indicating the unit of the first power.

[0112] The meter image 71 includes a needle-shaped pointer image 71a and an arc-shaped index image 71b. The index image 71b is composed of arc-shaped scale lines and multiple numerical image images. The index image 71b is arranged along the circumferential direction of the meter image 71. The numerical image of the index image 71b is arranged along the scale lines so that one end on the left side is zero and the other end on the right side is the maximum value. As the scale lines of the index image 71b progress from left to right, numerical image images with increasing values ​​are arranged. For example, the maximum value of the numerical image of the index image 71b is 6. Note that the specific numerical values ​​and the arrangement of the numerical values ​​are merely examples and are not limiting.

[0113] The display control unit 31d rotates the pointer image 71a so that one end of the pointer image 71a is located at the center of the meter image 71 and the other end of the pointer image 71a points to an index image 71b corresponding to the value of the first power. For example, a program that converts the relationship between the value of the first power and the rotation angle of the pointer image 71a into a function is stored in the memory 31b. When an instruction signal to display the first power is input, the display control unit 31d executes the program and defines (calculates) the rotation angle of the pointer image 71a corresponding to the value of the first power. The display control unit 31d controls the display of the pointer image 71a by rotating it at the defined angle.

[0114] The display control unit 31d displays a meter image 72, which displays the value of the second power detected by the BMU 14a, in the upper center of the main display screen G1. The display control unit 31d displays the charging power supplied to the power storage device 14 and the discharging power output from the power storage device 14 as the meter image 72. For example, the meter image 72 has a circular shape. At the bottom of the meter image 72, "B" is displayed, indicating that the display on the meter image 72 is the second power related to the power storage device 14, and "×10 kW" is displayed, indicating the unit of the second power. Above the meter image 72, "CHARGE," which indicates the charging power, and "DISCHARGE," which indicates the discharging power, are arranged adjacent to each other on the left and right sides of the 12 o'clock position (top) of the meter image 72.

[0115] The meter image 72 includes a needle-shaped pointer image 72a and arc-shaped index images 72b and 72c. The index images 72b and 72c are composed of arc-shaped scale lines and multiple numerical images. The index images 72b and 72c are arranged along the circumferential direction of the meter image 72. The index image 72b is arranged below "CHARGE," which indicates charging power. The index image 72c is arranged below "DISCHARGE," which indicates discharging power. The numerical images of the index images 72b and 72c are arranged along the scale lines so that the 12 o'clock position (top) of the meter image 72 is zero and one end of the index images 72b and 72c is the maximum value. The maximum value of the numerical images of the index images 72b and 72c is 6. Note that the specific numerical values ​​are merely examples and are not limiting.

[0116] The display control unit 31d rotates the pointer image 72a so that one end of the pointer image 72a is positioned at the center of the meter image 72 and the other end of the pointer image 72a points to the index images 72b, 72c corresponding to the value of the second power.

[0117] For example, the display control unit 31d rotates the pointer image 72a based on the difference between the charging power and the discharging power. The memory 31b stores a program that expresses the relationship between the difference between the charging power and the discharging power and the rotation angle of the pointer image 72a as a function. When an instruction signal to display the second power is input, the display control unit 31d executes the program and defines (calculates) the rotation angle of the pointer image 72a corresponding to the difference between the charging power and the discharging power. The display control unit 31d controls the display of the pointer image 72a to rotate at the defined angle. That is, when the control device 31 is in the first state (a state in which the storage device 14 is charging), one end of the pointer image 72a faces the index image 72b. When the control device 31 is in the second state or the third state (a state in which the storage device 14 is discharging), one end of the pointer image 72a faces the index image 72c.

[0118] If the meter image 72 includes two pointer images 72a, the display control unit 31d may rotate the pointer image 72a based on the respective values ​​of the charging power and the discharging power. The memory 31b stores a program that expresses the relationship between the charging power value and the rotation angle of the pointer image 72a as a function, and a program that expresses the relationship between the discharging power value and the rotation angle of the pointer image 72a as a function. When an instruction signal to display the second power is input, the display control unit 31d executes the two programs to define (calculate) the rotation angles of the two pointer images 72a. The display control unit 31d controls the display of the pointer image 72a by rotating it at the defined angles.

[0119] The display control unit 31d displays a meter image 73, which displays the output of the electric motor 4 calculated by the output calculation unit 44d, on the other side of the main display screen G1. For example, the meter image 73 has a circular shape. At the bottom of the meter image 73, "M" is displayed, indicating that the display on the meter image 73 is the output of the electric motor 4, and "×10 kW" is displayed, indicating the unit of the output of the electric motor 4.

[0120] The meter image 73 includes a needle-shaped pointer image 73a and an arc-shaped index image 73b. The index image 73b is composed of arc-shaped scale lines and multiple numerical image images. The index image 73b is arranged along the circumferential direction of the meter image 73. The numerical image of the index image 73b is arranged along the scale lines so that one end on the left side is zero and the other end on the right side is the maximum value. As the scale lines of the index image 73b progress from left to right, numerical image images with increasing values ​​are arranged. For example, the maximum value of the numerical image of the index image 73b is 6. Note that the specific numerical values ​​and the arrangement of the numerical values ​​are merely examples and are not limiting.

[0121] The display control unit 31d rotates the pointer image 73a so that one end of the pointer image 73a is located at the center of the meter image 73 and the other end of the pointer image 73a points to an index image 73b that corresponds to the output value of the electric motor 4. For example, a program that converts the relationship between the output value of the electric motor 4 and the rotation angle of the pointer image 73a into a function is stored in the memory 31b. When an instruction signal to display the output of the electric motor 4 is input, the display control unit 31d executes the program and defines (calculates) the rotation angle of the pointer image 73a that corresponds to the output value of the electric motor 4. The display control unit 31d controls the display of the pointer image 73a to rotate at the defined angle.

[0122] The display device 32 displays the shape 80 of the vehicle X together with the first power and the second power as the detailed display screen G2, and displays status information 65 indicating the status of the vehicle X superimposed on the shape 80 of the vehicle X. The display control unit 31d displays the graphic representing the shape 80 of the vehicle X below the meter images 71 to 73. Hereinafter, the graphic representing the shape 80 of the vehicle X may be referred to as the vehicle graphic 80. The status information 65 includes information indicating the source and destination of the power supply, among the electric motor 4, the fuel cell 13, and the power storage device 14.

[0123] The display control unit 31d displays a fuel cell graphic 82 representing the fuel cell 13 in front of the vehicle graphic 80. The display control unit 31d displays an electric motor graphic 83 representing the electric motor 4 in the rear of the vehicle graphic 80. The display control unit 31d displays a power storage device graphic 84 representing the power storage device 14 in the upper part of the vehicle graphic 80. The display control unit 31d displays a route graphic 85 in the center of the vehicle graphic 80 as status information 65 indicating the power supply source to the power supply destination. The fuel cell graphic 82, electric motor graphic 83, and power storage device graphic 84 are arranged to surround the route graphic 85.

[0124] The route graphic 85 includes three types of route graphics 85a to 85c that indicate the power supply source and the power supply destination. As described above, when supplying power, the control device 31 can switch the states of the power supply source and the power supply destination among three states: a first state, a second state, and a third state.

[0125] FIG. 9C is a diagram showing an example of the display of a route graphic 85a. As shown in FIG. 9C, the route graphic 85a indicates a first state. Specifically, the route graphic 85a indicates that the power supply source is the fuel cell 13, and the power supply destinations are the power storage device 14 and the electric motor 4. FIG. 9D is a diagram showing an example of the display of a route graphic 85b. As shown in FIG. 9D, the route graphic 85b indicates a second state. Specifically, the route graphic 85b indicates that the power supply source is the fuel cell 13 and the power storage device 14, and the power supply destination is the electric motor 4.

[0126] 9E is a diagram showing an example of the display of a route graphic 85c. As shown in FIG. 9E, the route graphic 85c indicates that the vehicle is in the second state. Specifically, the route graphic 85c indicates that the power source is the power storage device 14 and the power destination is the electric motor 4. In response to a display instruction signal from the control device 31, the display control unit 31d displays one of the route graphics 85a to 85c superimposed on the vehicle graphic 80.

[0127] The status information 65 also includes information indicating the remaining capacity of the power storage device 14. Fig. 9F is a diagram showing an example of the display of a power storage device graphic 84. As shown in Fig. 9F, the power storage device graphic 84a indicates that the remaining capacity of the power storage device 14 is fully charged (the remaining capacity is large). The power storage device graphic 84b indicates that the remaining capacity of the power storage device 14 is zero (the remaining capacity is low).

[0128] The memory 31b stores in advance a map associating the remaining capacity percentage of the power storage device 14 with the corresponding power storage device graphic 84. When a display instruction signal for the remaining capacity of the power storage device 14 is input from the control device 31, the display control unit 31d refers to the map and displays one of the corresponding power storage device graphics 84 superimposed on the vehicle graphic 80. This allows the worker to know the remaining capacity of the power storage device 14 by looking at the detailed display screen G2.

[0129] As shown in FIG. 4 , the display control unit 31d may display a graphic 86 behind the vehicle graphic 80, which indicates the status of the connection device 17 that supplies gas to the tank 12. Specifically, when the release detection sensor 41e detects that the lid of the connection device 17 has been released, the control device 31 inputs a display instruction signal to the display control unit 31d. The display control unit 31d turns on the graphic 86 behind the vehicle graphic 80 based on the input display instruction signal. Specifically, when the release detection sensor 41e detects that the connection device 17 has been closed by the lid, the control device 31 inputs a display instruction signal to the display control unit 31d. The display control unit 31d turns off the graphic 86 behind the vehicle graphic 80 based on the input display instruction signal. This allows the operator to easily grasp the status of the connection device 17.

[0130] The display control unit 31d may display a meter image 74 indicating the rotation speed of the electric motor 4 below a meter image 73 indicating the output of the electric motor 4. For example, the meter image 74 may be circular, and below the meter image 74, a message indicating that the meter image 74 displays the rotation speed of the electric motor 4 and "×1000 RPM" indicating the unit of rotation speed may be displayed. The meter image 73 includes a needle-shaped pointer image 74a and an arc-shaped index image 74b. When an instruction signal to display the rotation speed of the electric motor 4 detected by the rotation sensor 43b is input, the display control unit 31d defines (calculates) a rotation angle of the pointer image 74a corresponding to the value of the rotation speed of the electric motor 4. The display control unit 31d controls the pointer image 74a to be rotated and displayed at the defined angle. This reduces the amount of eye movement required by the worker to grasp information about the status of the electric motor 4, improving work efficiency.

[0131] The display control unit 31d may display a meter image 75 indicating the remaining capacity of the tank 12 below a meter image 71 indicating the first power generated by the fuel cell 13. For example, the meter image 74 may be circular, and an icon indicating the remaining capacity of the tank 12 may be displayed below the meter image 74. The meter image 75 includes a needle-shaped pointer image 75a and an arc-shaped indicator image 75b. When an instruction signal for displaying the remaining capacity of the tank 12 detected by the remaining gas amount calculation unit 41c is input, the display control unit 31d defines (calculates) a rotation angle of the pointer image 74a corresponding to the remaining capacity of the tank 12. The display control unit 31d controls the display of the pointer image 74a to rotate at the defined angle. This reduces the need for the operator to move their eyes to grasp information about the state of the fuel cell 13, improving work efficiency.

[0132] In the above-described embodiments (FIGS. 4 and 5), the vehicle graphics 50, 80 have been described as two-dimensional line drawings of the shape of the vehicle X (work vehicle 1), but the shape of the vehicle X may also be represented in three dimensions. For example, as shown in FIG. 10 , the display control unit 31d displays a vehicle graphic 90 representing the shape of the vehicle X in the center of the second detailed display screen G5 as the second detailed display screen G5. The shape 90 of the vehicle X is a three-dimensional line drawing of the shape of the vehicle X (work vehicle 1). The display control unit 31d displays the status information 60 (61 to 64) superimposed on the shape 90 of the vehicle X.

[0133] In the above-described embodiment, various pieces of information are displayed using circular meter images 71 to 75 on the main display screen G1 (FIG. 4), but the display format may be, for example, a rectangular bar format, or may be displayed as a numerical image.

[0134] In the above-described embodiment, the positions of the tank graphic 51 and the fuel cell graphic 52 on the vehicle graphic 50 on the detailed display screen G2 ( FIG. 5 ) generally coincide with the positions of the device Y on the vehicle body 2, but they do not necessarily have to coincide. In this case, the tank graphic 51 and the fuel cell graphic 52 are placed in positions that allow the user to imagine that they are pointing to the corresponding device Y.

[0135] Furthermore, the vehicle graphic 50, tank graphic 51, fuel cell graphic 52, electric motor graphic 53, and power storage device graphic 54 displayed on the detailed display screen G2 (FIG. 5) may be applied to the main display screen G1.

[0136] A preferred embodiment of the present invention provides a work vehicle 1 as described in the following items.

[0137] (Item A1) A work vehicle 1 equipped with a display device 32 that displays status information 60 indicating the status of vehicle X, the display device 32 displays the shape 50, 80, 90 of vehicle X and the status information 60 in a superimposed manner. According to the work vehicle 1 according to this item A1, the worker can intuitively understand that the information displayed on the display device 32 indicates the status of the work vehicle 1.

[0138] (Item A2) The work vehicle 1 according to Item A1, wherein the display device 32 displays a graphic of a device Y included in the vehicle X, and also displays status information 60 indicating the status of the device Y superimposed on the position of the displayed device Y. According to the work vehicle 1 according to Item A2, the worker can intuitively grasp which device Y the displayed status information 60 relates to, from the display position of the status information 60.

[0139] (Item A3) The work vehicle 1 according to Item A2, wherein the device Y is at least one of a tank 12 that stores gas, a fuel cell 13 that receives gas from the tank 12, an electric motor 4 that is driven by power generated by the fuel cell 13, and a power storage device 14 that stores the power generated by the fuel cell 13. With the work vehicle 1 according to Item A3, the worker can understand that the displayed information indicates the status of at least one device Y among the tank 12, the fuel cell 13, the electric motor 4, and the power storage device 14, and can also understand the status of the device Y.

[0140] (Item A4) The work vehicle 1 according to Item A1, comprising a tank 12 that is arranged on top of the vehicle X and that stores gas, and a fuel cell 13 that is supplied with gas from the tank 12, and the display device 32 displays a graphic that represents the shape 50, 80, 90 of the vehicle X, and displays the tank 12 at the position where the tank 12 is arranged in the displayed graphic, and displays status information 60 of the tank 12 at the position where the tank 12 is displayed. According to the work vehicle 1 according to Item A4, the worker can intuitively grasp that the tank 12 is arranged on top of the vehicle X and that the status information 60 indicates the status of the tank 12, based on the display position of the status information 60.

[0141] (Item A5) The work vehicle 1 according to Item A1, comprising a tank 12 that stores gas, and a fuel cell 13 that is disposed at the front of the vehicle X and that receives gas from the tank 12, and the display device 32 displays a graphic that represents the shape 50, 80, 90 of the vehicle X, and also displays the fuel cell 13 at the position where the fuel cell 13 is disposed in the displayed graphic, and displays status information 60 of the fuel cell 13 at the position where the fuel cell 13 is displayed. With the work vehicle 1 according to Item A5, the worker can intuitively grasp that the fuel cell 13 is disposed at the front of the vehicle X, and that the status information 60 indicates the status of the fuel cell 13, based on the display position of the status information 60.

[0142] (Item A6) The work vehicle 1 according to Item A1, which includes a fuel cell 13 and an electric motor 4 driven by power generated by the fuel cell 13, and wherein the display device 32 displays a graphic representing the shape 50, 80, 90 of the vehicle X, and also displays the electric motor 4 at the position where the electric motor 4 is located in the displayed graphic, and displays status information 60 of the electric motor 4 at the position where the electric motor 4 is displayed. With the work vehicle 1 according to Item A6, the worker can intuitively grasp from the display position of the status information 60 that the electric motor 4 is located in the vehicle X, and that the status information 60 indicates the status of the electric motor 4.

[0143] (Item A7) The work vehicle 1 according to any one of Items A1 to A6, wherein the shape 50, 80, 90 of the vehicle X is expressed in two dimensions or three dimensions. According to the work vehicle 1 according to Item A7, the worker can easily understand the shape of the work vehicle 1 by checking the shape 50, 80, 90 of the vehicle X displayed on the display device 32.

[0144] (Item A8) The work vehicle 1 according to any one of Items A1 to A7, further comprising an inclination angle sensor S1 that detects the inclination angle of the vehicle, and wherein the display device 32 displays an attitude display unit 55 that rotates in accordance with the inclination angle detected by the inclination angle sensor S1, along with the shape 50, 80, 90 of the vehicle X and the status information 60. According to the work vehicle 1 according to Item A8, the worker can intuitively grasp the degree to which the vehicle X is inclined and the tendency of the vehicle X's tilting behavior by looking at the rotation state of the attitude display unit 55.

[0145] (Item A9) A work vehicle 1 comprising a fuel cell 13, an electric motor 4 driven by power generated by the fuel cell 13, a power storage device 14 that stores the power generated by the fuel cell 13 and is capable of supplying power to the electric motor 4, and a display device 32 that displays a first power generated by the fuel cell 13 and a second power related to the power storage device 14 in the same units. With the work vehicle 1 according to item A9, a worker can easily compare the magnitude of each power simply by visually checking the two types of power, the first power generated by the fuel cell 13 and the second power related to the power storage device 14.

[0146] (Item A10) The work vehicle 1 according to Item A9, wherein the display device 32 displays the output of the electric motor 4 in the same unit. With the work vehicle 1 according to Item A10, the worker can easily compare the magnitude of each power by simply visually checking three types of power: the first power generated by the fuel cell 13, the second power related to the power storage device 14, and the output of the electric motor 4.

[0147] (Item A11) The work vehicle 1 according to Item A9, wherein the display device 32 displays the power supplied to the power storage device 14 and the power output from the power storage device 14 as the second power. According to the work vehicle 1 according to Item A11, the worker can individually grasp the power supplied to the power storage device 14 and the power output from the power storage device 14. Therefore, the worker can easily grasp whether the power storage device 14 is supplying power or outputting power.

[0148] (Item A12) The work vehicle 1 according to Item A11, wherein the display device 32 displays a shape 50, 80, 90 of a vehicle X together with the first power and the second power, and displays status information 60 indicating the status of the vehicle superimposed on the shape 50, 80, 90 of the vehicle X. According to the work vehicle 1 according to Item A12, the worker can grasp the magnitude of the first power and the second power while simultaneously grasping the status of the vehicle.

[0149] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0150] 1: Work vehicle 4: Electric motor 12: Tank 13: Fuel cell 14: Power storage device 32: Display device 50, 80, 90: Vehicle shape (vehicle figure) 55: Attitude display unit 60-65: Status information X: Vehicle Y: Equipment

Claims

1. A work vehicle equipped with a display device that displays status information indicating the vehicle's status, wherein the display device displays the vehicle's shape and the status information in a superimposed manner.

2. A work vehicle as described in claim 1, wherein the display device displays a graphic of the equipment included in the vehicle and superimposes status information indicating the status of the equipment at the position of the displayed equipment.

3. A work vehicle as described in claim 2, wherein the equipment is at least one of a tank that stores gas, a fuel cell that receives gas from the tank, an electric motor that is driven by electricity generated by the fuel cell, and an electricity storage device that stores the electricity generated by the fuel cell.

4. A work vehicle as described in claim 1, comprising: a tank arranged on top of the vehicle and storing gas; and a fuel cell to which gas is supplied from the tank; wherein the display device displays a graphic representing the shape of the vehicle and displays the tank at the position where the tank is arranged in the displayed graphic; and displays status information of the tank at the position where the tank is displayed.

5. A work vehicle as described in claim 1, comprising: a tank for storing gas; and a fuel cell arranged at the front of the vehicle and supplied with gas from the tank; wherein the display device displays a graphic representing the shape of the vehicle and displays the fuel cell at the position where the fuel cell is arranged in the displayed graphic; and displays status information of the fuel cell at the position where the fuel cell is displayed.

6. A work vehicle as described in claim 1, comprising an electric motor driven by power generated by a fuel cell, wherein the display device displays a graphic representing the shape of the vehicle and also displays the electric motor at the position where the electric motor is located on the displayed graphic, and displays status information of the electric motor at the position where the electric motor is displayed.

7. A work vehicle according to any one of claims 1 to 6, wherein the shape of the vehicle is displayed in two or three dimensions.

8. A work vehicle as described in claim 1, further comprising an inclination angle sensor for detecting the inclination angle of the vehicle, and wherein the display device displays, together with the shape and status information of the vehicle, an attitude display unit that rotates in accordance with the inclination angle detected by the inclination angle sensor.

9. A work vehicle comprising: a fuel cell; an electric motor driven by power generated by the fuel cell; a power storage device capable of storing the power generated by the fuel cell and supplying the power to the electric motor; and a display device that displays a first power generated by the fuel cell and a second power related to the power storage device in the same units.

10. A work vehicle according to claim 9, wherein the display device displays the output of the electric motor in the same unit.

11. The work vehicle according to claim 9, wherein the display device displays the electric power supplied to the power storage device and the electric power output from the power storage device as the second electric power.

12. A work vehicle according to claim 11, wherein the display device displays the shape of the vehicle together with the first power and the second power, and superimposes status information indicating the status of the vehicle on the shape of the vehicle.

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