Work vehicle

Abstract

To highly efficiently consume energy.SOLUTION: A work vehicle comprises: an energy storage portion 27 storing energy; a prime mover 29 which is supplied with energy and generates power; a travel device which is operated by power; a work power output portion (37, 38) which outputs power to be supplied to a work device performing a work; a travel transmission system which transmits power from the prime mover 29 to the travel device; a work transmission system which transmits power from the prime mover 29 to the work power output portion (37, 38); a residual quantity detection portion 62 which detects a residual quantity of energy stored in the energy storage portion 27; and a transmission control portion 64 which controls transmission states of the travel transmission system and the work transmission system. The transmission control portion 64 performs saving control for stopping output of power from the work power output portion (37, 38) when the residual quantity detection portion 62 detects that the residual quantity is a prescribed reference residual quantity or less.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a work vehicle that is equipped with a prime mover that receives a supply of energy and generates power, and in which a traveling device and a working device are driven by the power generated by the prime mover. [Background technology]

[0002] As disclosed in Patent Document 1, a work machine (work vehicle, electric work vehicle) includes a battery unit (battery) and an electric motor (motor) that is driven by electricity stored in the battery unit. The work machine also includes a traveling device that drives the machine body, and a work device that performs a predetermined task can be attached and detached. The traveling device and the work device are driven by electricity generated by the electric motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-099086 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is a limit to the amount of power that can be stored in a battery, and in order to drive the vehicle for work efficiently, it is necessary to reduce power (energy) consumption.

[0005] An object of the present invention is to efficiently consume energy. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a work vehicle according to one embodiment of the present invention comprises an energy storage unit that accumulates energy, a prime mover that receives a supply of the energy and generates power, a traveling device that operates using the power, a work power output unit that outputs the power supplied to a work device that performs work, a traveling transmission system that transmits the power from the prime mover to the traveling device, a work transmission system that transmits the power from the prime mover to the work power output unit, a remaining amount detection unit that detects the remaining amount of energy accumulated in the energy storage unit, and a transmission control unit that controls the transmission state of the traveling transmission system and the work transmission system, and when the remaining amount detection unit detects that the remaining amount is equal to or less than a predetermined standard remaining amount, the transmission control unit performs saving control to stop the output of the power from the work power output unit.

[0007] When the stored energy runs out, the work machine cannot work, let alone travel. Generally, energy is replenished at a designated location, but if the energy runs out while the machine is traveling for work, it cannot move to a replenishment location to replenish energy.

[0008] According to the above configuration, when the remaining amount of stored energy becomes low, the output of power from the work power output unit is stopped before traveling becomes impossible. Therefore, power is no longer supplied to the working device, and work cannot be performed. Even in this case, power is supplied to the traveling device, so it is possible to move to a replenishment location and receive energy replenishment. Also, since power is not supplied to the working device, all of the power is supplied to the traveling device, and the prime mover operates efficiently. As a result, the prime mover operates efficiently and energy consumption can be made more efficient.

[0009] The transmission control section may stop the transmission of the power by the work transmission system, thereby stopping the output of the power from the work power output section.

[0010] With this configuration, power is not transmitted to the working device, so the load on the prime mover is reduced, allowing the prime mover to operate more efficiently, and the energy consumption of the prime mover can be made more efficient.

[0011] Furthermore, a work vehicle according to one embodiment of the present invention comprises an energy storage unit that stores energy, a prime mover that receives a supply of the energy and generates power, a traveling device that operates using the power, a work power output unit that outputs the power supplied to a work device that performs work, a traveling transmission system that transmits the power from the prime mover to the traveling device, a work transmission system that transmits the power from the prime mover to the work power output unit, a remaining amount detection unit that detects the remaining amount of energy stored in the energy storage unit, and a transmission control unit that controls the transmission state of the traveling transmission system and the work transmission system, wherein the traveling transmission system includes a continuously variable transmission device that changes the speed of the power input to a hydraulic pump and outputs it from a hydraulic motor, and when the remaining amount detection unit detects that the remaining amount is equal to or less than a predetermined reference remaining amount, the transmission control unit performs saving control to reduce the power input to the hydraulic pump.

[0012] The greater the power input to a hydraulic pump, the greater the loss in the power output. With the above configuration, the power input to the hydraulic pump is reduced, thereby reducing the loss generated in the hydraulic pump. As a result, the prime mover can operate efficiently, and the energy consumption of the prime mover can be made more efficient.

[0013] In addition, the power may be transmitted to the hydraulic pump as rotational power of a propeller shaft, the propeller shaft may have a transmission, and the transmission control unit may reduce the power input to the hydraulic pump by reducing the rotation speed of the propeller shaft using the transmission.

[0014] With this configuration, the power input to the hydraulic pump can be reduced with high precision, allowing the prime mover to operate efficiently and improving the efficiency of energy consumption of the prime mover.

[0015] The vehicle may further include a notification unit that issues a predetermined notification, and the transmission control unit may cause the notification unit to issue the notification that the power saving control will be performed when the power saving control is performed.

[0016] With this configuration, the worker is notified and is aware in advance that energy saving control will be performed. Therefore, the worker can prepare an appropriate response in advance, including determining whether or not energy saving control is necessary. As a result, the prime mover can be operated efficiently, and the energy consumption of the prime mover can be made more efficient.

[0017] In addition, the vehicle may further include a saving operation device that accepts whether or not the saving control needs to be executed, and the transmission control unit may execute the saving control by accepting an operation to request the saving control to be executed on the saving operation device after issuing the notification that the saving control will be executed.

[0018] With this configuration, an operator who is aware that energy saving control is being performed can determine whether or not it is appropriate to perform energy saving control, and can operate the power saving control only when necessary. As a result, the prime mover can be operated efficiently, and the energy consumption of the prime mover can be made more efficient.

[0019] The prime mover may be a motor, the energy may be electric power, and the energy storage unit may be a battery.

[0020] With this configuration, the motor, which is the prime mover, can be operated efficiently, and the power consumption of the motor can be made more efficient.

[0021] The prime mover may be an engine and the energy may be fuel.

[0022] With this configuration, the engine, which is the prime mover, can be operated efficiently, and the fuel consumption of the engine can be made more efficient. [Brief description of the drawings]

[0023] [Figure 1] FIG. [Diagram 2] FIG. 2 is a left side view in vertical section showing the arrangement of a battery, a motor, etc. [Diagram 3] FIG. [Figure 4] FIG. 2 is a diagram illustrating a configuration for executing saving control. [Diagram 5] FIG. 11 is a diagram illustrating a processing flow of saving control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Below, we will explain about work vehicles (electric work vehicles) using a tractor as an example. In the following figures, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, F indicates the forward direction which is the forward direction, and B indicates the backward direction.

[0025] (Overall configuration of the tractor) As shown in Fig. 1, the machine body 3 has right and left front wheels 1 (corresponding to the running gear) and right and left rear wheels 2 (corresponding to the running gear). The tractor has a bonnet 4 at the front of the machine body 3, and a driver's section 5 at the rear of the machine body 3. The driver's section 5 has a steering wheel 6 for steering the front wheels 1, a driver's seat 7, and a rope frame 9.

[0026] As shown in Figures 1 and 2, the machine body 3 has right and left machine body frames 10, a continuously variable transmission 11, a transmission case 12, etc. The continuously variable transmission 11 is connected to the front part of the transmission case 12. The machine body frame 10 is provided along the front-to-rear direction, and the continuously variable transmission 11 and the transmission case 12 are connected to it. The front wheels 1 are attached to a front axle case 8 supported on the front part of the machine body frame 10. The rear wheels 2 are attached to the transmission case 12.

[0027] The transmission case 12 supports, at its rear portion, one top link 13 and right and left lower links 14 so that they can swing up and down. Right and left lift arms 15 are supported at the rear portion of the transmission case 12. A rod 16 is connected between the lift arms 15 and the lower links 14.

[0028] Various types of working equipment (not shown) can be attached to the top link 13 and the lower link 14. The working equipment is raised and lowered via the top link 13 and the lower link 14 as the lift arm 15 is swung up and down.

[0029] (Front loader configuration) 1, the tractor is equipped with a front loader 17 (corresponding to a working device) at the front of the machine body 3. The front loader 17 has a base 18, a boom 19, a bucket 20, a boom cylinder 21, a bucket cylinder 22, a frame 23, and the like.

[0030] The right and left bases 18 are connected to the machine frame 10, extend upward, and are disposed on the right and left sides of the rear of the bonnet 4. The right and left booms 19 are attached to the upper parts of the bases 18 so as to be able to swing up and down, and extend forward. The right and left boom cylinders 21 are attached across the bases 18 and the boom 19, and operate the boom 19 to raise and lower.

[0031] The bucket 20 is attached to the front of the boom 19 so as to be able to swing up and down. A frame 23 is connected across the right and left booms 19. A bucket cylinder 22 is connected across the bucket 20 and the frame 23, and the bucket 20 is operated for scooping and dumping by the bucket cylinder 22.

[0032] (Moore's composition) 1, the tractor has a mower 24 (corresponding to a working device) that can be attached to and detached from the machine frame 10. The mower 24 is disposed between the front wheels 1 and the rear wheels 2, and can be raised and lowered relative to the machine frame 10.

[0033] The mower 24 includes three blades (not shown) that are driven to rotate around an axis that extends in the up-down direction. The three blades are disposed inside the mower 24 so as to be aligned in the left-right direction.

[0034] (Front configuration of the aircraft) As shown in FIG. 2, the tractor is provided with a battery 27, an inverter 28 and a motor 29 (corresponding to a prime mover), a battery 33 (corresponding to an energy storage unit), and the like, at the front of the machine frame 10.

[0035] The right and left support members 25 are connected to the front part of the body frame 10, and a flat support frame 26 is connected to the support members 25. The battery 27 is provided inside the bonnet 4 and supported on the upper surface of the support frame 26.

[0036] The inverter 28 is attached to the front of the lower surface of the support frame 26. The motor 29 is attached to the rear of the lower surface of the support frame 26, and is disposed between the right and left aircraft frames 10.

[0037] The inverter 28 and the motor 29 are covered from below by a lower cover 30. The lower cover 30 is provided with a fan 31 in its front portion. The fan 31 introduces outside air into the inside of the lower cover 30, and the inverter 28 and the motor 29 are cooled by the outside air.

[0038] An arch-shaped frame 32 is connected across the right and left body frames 10, and is disposed at the rear end of the bonnet 4. A 12V battery 33 is supported by the frame 32.

[0039] The battery 27 supplies power to the inverter 28. The inverter 28 converts the DC power of the battery 27 into AC power and supplies it to the motor 29. The motor 29 is operated by receiving the AC power from the inverter 28.

[0040] Battery 27 supplies power to a DC-DC converter (not shown), and the DC-DC converter reduces the voltage of the supplied power to 12 V. The DC-DC converter supplies the power reduced to 12 V to battery 33. Various devices (not shown) equipped on the tractor are operated by the 12 V power from battery 33.

[0041] (Configuration of transmission system to front and rear wheels and mower) 2 and 3, power supplied from the motor 29 is transmitted to the front wheels 1 and the rear wheels 2 via a driving transmission system 41. The driving transmission system 41 includes the motor 29, a drive shaft 34 (input shaft), the continuously variable transmission 11, a transmission 44 mounted on the transmission case 12, a transmission shaft 35, and a transmission shaft 36.

[0042] The tractor includes a mid PTO shaft 37 (corresponding to a work power output section) and a rear PTO shaft 38 (corresponding to a work power output section). The mower 24 is detachably attached to the mid PTO shaft 37, and outputs power to the mower 24. The rear PTO shaft 38 outputs power to a work implement, and the work implement is detachably attached to the rear PTO shaft 38, the top link 13, and the lower link 14. Power supplied from the motor 29 is transmitted to the mid PTO shaft 37 and the rear PTO shaft 38 via a work transmission system 42. The work transmission system 42 includes the motor 29, the propeller shaft 34, a work transmission shaft 45, etc.

[0043] The power of the motor 29 is transmitted to the continuously variable transmission 11 via the drive shaft 34. The continuously variable transmission 11 has a hydraulic pump 11a and a hydraulic motor 11b. The continuously variable transmission 11 changes the speed of the power input to the hydraulic pump 11a and outputs it from the hydraulic motor 11b. The drive shaft 34 rotates according to the power of the mower 24. The power of the mower 24 is transmitted to the hydraulic pump 11a as the rotational power of the drive shaft 34 (input shaft). The continuously variable transmission 11 is configured as a hydrostatic type and is capable of continuously changing the speed between the forward and reverse sides. The operator can operate the continuously variable transmission 11 via a travel operating tool 56 (see FIG. 4) provided on the driver's unit 5.

[0044] The power changed in speed by the continuously variable transmission 11 is transmitted to the rear wheels 2 via a transmission 44 (auxiliary transmission) and a rear wheel differential (not shown) provided inside the transmission case 12. The power branches just before the rear wheel differential, and the branched power is transmitted via transmission shafts 35 and 36 to a front wheel differential (not shown) provided inside the front axle case 8, and then transmitted from the front wheel differential to the front wheels 1.

[0045] The mid PTO shaft 37 is provided facing forward at a lower part of the front part of the transmission case 12, and the rear PTO shaft 38 is provided facing backward at the rear part of the transmission case 12. Power transmitted by the propeller shaft 34, which is not subjected to speed change by the continuously variable transmission 11, is transmitted to the mid PTO shaft 37 and the rear PTO shaft 38 (hereinafter, these will be simply referred to as PTO shafts) via a work transmission shaft 45 branching off from the propeller shaft 34.

[0046] [Economy control] Generally, a tractor charges at a predetermined location (supply location) equipped with a power source such as a warehouse. If the power stored in the battery 27 (corresponding to an energy storage unit) runs out during work, the tractor cannot move to the supply location and cannot charge. In addition, when the working implement is operated, the output of the working implement is increased, or the traveling speed is increased, the rotation speed (output) of the motor 29 increases, and the amount of power consumed increases. Furthermore, as the rotation speed of the motor 29 increases, the rotation speed of the hydraulic pump 11a also increases, and the efficiency of power transmission from the hydraulic pump 11a to the hydraulic motor 11b deteriorates, and the efficiency of power consumption also deteriorates. Therefore, if the remaining amount of power stored in the battery 27 (remaining amount of the battery 27) is low, if the working implement is operated or the traveling speed is increased, the travelable distance may be insufficient and it may not be possible to move to the supply location.

[0047] Therefore, it is preferable to perform power saving control to extend the travel distance of the tractor when the remaining charge of the battery 27 becomes low. Hereinafter, the power saving control will be described with reference to Fig. 3 and Fig. 4 and Fig. 5.

[0048] The tractor (work vehicle) is equipped with a controller 60, which executes saving control. The controller 60 is equipped with a processor such as a CPU, and is controlled by the processor. The controller 60 may be built into the ECU of the tractor, or may be mounted on the tractor separately from the ECU. The controller 60 may also be a vehicle control unit (VCU) that controls the vehicle. The controller 60 is equipped with a remaining amount detection unit 62 and a transmission control unit 64. The controller 60 may further include a memory unit, etc., as necessary.

[0049] The remaining amount detection unit 62 detects the remaining amount of power stored in the battery 27 (the remaining amount of the battery 27). In particular, the remaining amount detection unit 62 detects whether or not the remaining amount of the battery 27 is equal to or less than a predetermined reference remaining amount. The reference remaining amount is determined in advance based on the amount of power required to travel to the replenishment location. For example, the reference remaining amount can be determined based on the distance from the location where work is being performed to the replenishment location, and may be set to the average amount of power considered to be required to travel to the replenishment location.

[0050] The transmission control unit 64 controls the transmission states of the traveling transmission system 41 and the work transmission system 42. As the saving control, the transmission control unit 64 stops the output of power from the PTO shafts (the mid PTO shaft 37 and the rear PTO shaft 38, which correspond to the work power output units) when the remaining charge detection unit 62 detects that the remaining charge of the battery 27 is equal to or less than a predetermined reference remaining charge. For example, the transmission control unit 64 stops the transmission of power by the work transmission system 42 in order to stop the output of power from the PTO shafts as the saving control.

[0051] Specifically, first, the transmission control unit 64 judges whether the remaining charge detection unit 62 has detected that the remaining charge of the battery 27 is equal to or less than a predetermined reference remaining charge (step #1 in FIG. 5). If the remaining charge detection unit 62 has detected that the remaining charge of the battery 27 is equal to or less than a predetermined reference remaining charge (step #1 Yes in FIG. 5), the transmission control unit 64 stops the transmission of power by the work transmission system 42 and stops the output of power from the PTO shaft (step #2 in FIG. 5).

[0052] For this purpose, a clutch 48 is provided on the work transmission shaft 45, and the transmission control section 64 controls the clutch 48 to stop the rotation (power transmission) of the work transmission shaft 45, thereby stopping the output of power from the PTO shaft.

[0053] In this way, by stopping the output of power from the PTO shaft, the power that needs to be supplied from the motor 29 is reduced, and the amount of power consumed by the motor 29 can be reduced. In other words, by stopping the PTO shaft, the loss of power output from the motor 29 is reduced, and the amount of power consumed by the motor 29 can be reduced. This saves on the consumption of power from the battery 27, making it easier to ensure the power used for traveling. As a result, the travelable distance (travelable time) is extended, and the possibility of the tractor moving to a refueling location can be improved.

[0054] [Another embodiment] (1) The power saving control is not limited to a configuration in which the power output from the PTO shaft is stopped, and may be a configuration in which the power input from the motor 29 to the hydraulic pump 11a of the continuously variable transmission 11 is reduced.

[0055] For example, the transmission control unit 64 reduces the power input to the hydraulic pump 11a by reducing the rotation speed of the propeller shaft 34. For this purpose, a speed change device 47 consisting of gears or the like is provided on the propeller shaft 34. Then, as an energy saving control, the transmission control unit 64 controls the speed change device 47 to reduce the rotation speed of the propeller shaft 34, thereby reducing the power input to the hydraulic pump 11a.

[0056] Since the power (rotation speed) input to the hydraulic pump 11a is reduced, the transmission loss of the power transmitted from the hydraulic pump 11a to the hydraulic motor 11b is reduced. Therefore, the continuously variable transmission 11 operates efficiently, and the motor 29 operates efficiently. As a result, the consumption of power from the battery 27 is saved, it becomes easier to secure the power used for traveling, the traveling distance (traveling time) is extended, and the possibility that the tractor can move to a refueling location can be improved.

[0057] (2) In each of the above embodiments, the transmission control unit 64 may issue a notification that power saving control is to be performed when power saving control is to be performed. For this purpose, the tractor includes a notification unit 66 that issues a predetermined notification.

[0058] When the remaining charge detection unit 62 detects that the remaining charge of the battery 27 is equal to or less than a predetermined reference remaining charge, the transmission control unit 64 first causes the notification unit 66 to notify that power saving control will be performed. After the notification is performed, the transmission control unit 64 executes the power saving control.

[0059] This allows the worker to know in advance that energy saving control will be performed by the notification. Therefore, the worker can easily take appropriate measures as necessary. For example, if it is necessary to continue work or to drive at high speed, the worker can take measures to stop the energy saving control after the notification and before the energy saving control is performed.

[0060] Furthermore, the energy saving control may be configured to be executed in response to the operation of the work vehicle after the notification. Therefore, the tractor is provided with an energy saving operation tool 68 that receives a signal indicating whether or not energy saving control is required to be executed.

[0061] In this case, first, when the remaining charge detection unit 62 detects that the remaining charge of the battery 27 is equal to or less than a predetermined reference remaining charge (step #1 in FIG. 5), the transmission control unit 64 causes the notification unit 66 to notify that power saving control will be performed (step #2-1 in FIG. 5).

[0062] This notification makes the worker aware that saving control will be executed. The worker, who is aware that saving control will be executed, determines whether or not saving control should be executed, taking into consideration the conditions of the work drive, etc. If it is determined that saving control should be executed, the worker operates the saving operation tool 68 to request the execution of saving control (step #2-2 in FIG. 5).

[0063] When the power saving operating device 68 is operated, the transmission control section 64 controls the motor 29 to stop the transmission of power by the work transmission system 42, thereby stopping the output of power from the PTO shaft (step #2-3 in FIG. 5).

[0064] In this way, the transmission control section 64 performs energy saving control only after notifying the user that energy saving control will be performed and then receiving an operation requesting the execution of energy saving control on the energy saving operating device 68. Therefore, energy saving control is performed only when necessary depending on the conditions of the work traveling, etc., so that it becomes easy to secure the power required for work traveling while conserving the power of the battery 27.

[0065] (3) In each of the above embodiments, the controller 60 is not limited to being composed of the above-mentioned functional blocks, and may be composed of any functional blocks. For example, each functional block of the controller 60 may be further subdivided, or conversely, some or all of the functional blocks may be combined. Furthermore, the functions of the controller 60 are not limited to the above-mentioned functional blocks, and may be realized by a method executed by any functional block. Furthermore, some or all of the functions of the controller 60 may be configured by software. A program related to the software is stored in any storage device and executed by a processor such as a CPU included in the controller 60 or a processor provided separately.

[0066] (4) In each of the above embodiments, the tractor does not have to include the front loader 17. In addition, the tractor does not have to include the mower 24. In other words, the tractor can be configured to be capable of detachably mounting any working implement. Furthermore, the tractor may be configured without either the mid PTO shaft 37 or the rear PTO shaft 38.

[0067] (5) In each of the above embodiments, the tractor is not limited to a configuration in which the traveling device and the working device are driven by one motor 29, and may include a traveling motor that drives the traveling device and a work motor that drives the working device. In this case, the transmission control unit 64 may stop the work motor instead of stopping the transmission of power by the work transmission system 42 (output of power from the PTO shaft) during power saving control.

[0068] (6) In each of the above embodiments, the present invention is not limited to a tractor (work vehicle) driven by motor 29 powered by battery 27, but may be applied to a work vehicle driven by any prime mover such as an engine powered by fuel. In this case, the tractor is provided with a tank for storing fuel, which is energy, as an energy storage unit. Then, by executing saving control, the amount of fuel (energy) consumed is suppressed, and the possibility of moving to a refueling location is improved. [Industrial Applicability]

[0069] The present invention can be applied not only to tractors but also to work vehicles that perform any type of work, such as agricultural work or civil engineering work. [Explanation of symbols]

[0070] 1 Front wheel (running gear) 2 Rear wheels (running gear) 11 Continuously variable transmission 11a Hydraulic pump 11b Hydraulic motor 17 Front loader (work equipment) 24 Mower (working device) 27 Battery (energy storage unit) 29 Motor (prime mover) 34 Propulsion shaft (input shaft) 37 Mid PTO shaft (working power output part) 38 Rear PTO shaft (working power output part) 41 Driving Transmission System 42 Work Transmission System 47 Gearbox 62 Remaining amount detection unit 64 Transmission control section 66 Notification Department 68 Savings Operation Tool

Claims

1. an energy storage unit that stores energy; A prime mover that receives the energy and generates power; A traveling device operated by the power; a working power output unit that outputs the power to be supplied to a working device that performs work; a driving transmission system that transmits the power from the prime mover to the driving device; a work transmission system that transmits the power from the prime mover to the work power output section; a remaining amount detection unit that detects a remaining amount of the energy stored in the energy storage unit; A transmission control unit that controls a transmission state of the traveling transmission system and the work transmission system, The transmission control unit performs power saving control to stop the output of the power from the work power output unit when the remaining amount detection unit detects that the remaining amount is equal to or less than a predetermined reference remaining amount.

2. The work vehicle according to claim 1 , wherein the transmission control section stops the output of the power from the work power output section by stopping the transmission of the power by the work transmission system.

3. an energy storage unit that stores energy; A prime mover that receives the energy and generates power; A traveling device operated by the power; a working power output unit that outputs the power to be supplied to a working device that performs work; a driving transmission system that transmits the power from the prime mover to the driving device; a work transmission system that transmits the power from the prime mover to the work power output section; a remaining amount detection unit that detects a remaining amount of the energy stored in the energy storage unit; A transmission control unit that controls a transmission state of the traveling transmission system and the work transmission system, The traveling transmission system includes a continuously variable transmission that changes the speed of the power input to a hydraulic pump and outputs the power from a hydraulic motor, The transmission control unit performs power saving control to reduce the power input to the hydraulic pump when the remaining amount detection unit detects that the remaining amount is equal to or less than a predetermined reference remaining amount.

4. The power is transmitted to the hydraulic pump as rotational power of a propulsion shaft, The propeller shaft has a transmission, The work vehicle according to claim 3 , wherein the transmission control section reduces the power input to the hydraulic pump by reducing the rotation speed of the drive shaft by the speed change device.

5. Further comprising a notification unit for issuing a predetermined notification, The work vehicle according to claim 1 , wherein the transmission control unit causes the notification unit to issue the notification that the energy saving control will be performed when the energy saving control is performed.

6. Further, a saving operation device is provided for receiving a request for execution of the saving control, The work vehicle according to claim 5 , wherein the transmission control unit performs the energy saving control by receiving an operation for requesting the execution of the energy saving control on the energy saving operating tool after issuing the notification that the energy saving control will be performed.

7. 5. The work vehicle according to claim 1, wherein the prime mover is a motor, the energy is electric power, and the energy storage unit is a battery.

8. 5. The work vehicle according to claim 1, wherein the prime mover is an engine and the energy is fuel.

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