electric work vehicle

Abstract

To provide an electric work vehicle that provides enhanced security such as theft prevention at the time of battery charge.SOLUTION: An electric work vehicle includes: a control state switch unit 35 configured to switch a control unit to an operational state in response to a first operation of a manipulation device and switch the control unit to an inactive state in response to a second operation of the manipulation device; and a charge control unit 43 configured to control charging of a battery. The control unit includes: a motor control unit 61 configured to control driving of an electric motor 1; a mode setting unit 62 configured to set a charge mode allowing for charging of the battery and an operation mode allowing for driving of the electric motor 1; an actuation prohibition unit 63 to prohibit actuation of the electric motor 1 after completion of the charging; and an actuation prohibition release unit 64 configured to release the actuation prohibition.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electric work vehicle that is driven by the power of an electric motor that is supplied with power from a rechargeable battery. [Background technology]

[0002] In this type of electric work vehicle, when the battery power is consumed, the battery is connected to an external power supply device via a connection port, and the battery is charged with power from this power supply device, as described in Patent Document 1, for example. Since it takes more than an hour to charge the battery, the driver (caretaker) may leave the charging site while the battery is charging, which could result in the electric work vehicle being stolen.

[0003] Plug-in vehicles are generally parked at charging stations located along roads or the like to charge their batteries. For example, in the plug-in vehicle management system described in Patent Document 2, an intrusion sensor and a camera are installed in the plug-in vehicle, and an image monitor is installed in the charging station. When the intrusion sensor detects unauthorized operation of the plug-in vehicle, the image captured by the camera is displayed on the image monitor. This strengthens security when the battery is being charged at the charging station. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-000957 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-182239 Summary of the Invention [Problem to be solved by the invention]

[0005] Charging stations that can be used by electric work vehicles are not widely available. Furthermore, installing an anti-theft camera or other device that functions while the vehicle is charging poses environmental and cost problems, especially when taking photos at night when lighting is required. Given these circumstances, there is a demand for electric work vehicles with more effective anti-theft and other security measures when the battery is charging. [Means for solving the problem]

[0006] The electric work vehicle according to the present invention is driven by the power of an electric motor supplied with power from a rechargeable battery, and is provided with a control unit that controls the electric work vehicle, a control state switching unit that switches the control unit to an operating state in response to a first operation (e.g., an ON operation) of a manual operation device, and switches the control unit to a dormant state in response to a second operation (e.g., an OFF operation) of the manual operation device, a charging power connection unit that receives charging power for the battery, and a charging control unit that controls charging of the battery with the charging power, The control unit includes a motor control unit that controls the driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the start prohibition of the electric motor. 、 The start inhibition by the start inhibition unit is released by operating the first operation of the manual operation device. do. The electric work vehicle according to the present invention is driven by the power of an electric motor supplied with power from a rechargeable battery, and is provided with a control unit that controls the electric work vehicle, a control state switching unit that switches the control unit to an operating state in response to a first operation (e.g., an ON operation) of a manual operation device, and switches the control unit to a dormant state in response to a second operation (e.g., an OFF operation) of the manual operation device, a charging power connection unit that receives charging power for the battery, and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, If charging of the battery does not start within a predetermined time after a command to start charging is issued in the charging mode, the power supply to the control unit is cut off. do. The electric work vehicle according to the present invention is driven by the power of an electric motor supplied with power from a rechargeable battery, and is provided with a control unit that controls the electric work vehicle, a control state switching unit that switches the control unit to an operating state in response to a first operation (e.g., an ON operation) of a manual operation device, and switches the control unit to a dormant state in response to a second operation (e.g., an OFF operation) of the manual operation device, a charging power connection unit that receives charging power for the battery, and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, After the charging of the battery is completed, if the state of the first operation using the manual operation device is maintained, the power supply of the control unit is cut off after a predetermined time has elapsed. do. The electric work vehicle according to the present invention is driven by the power of an electric motor supplied with power from a rechargeable battery, and is provided with a control unit that controls the electric work vehicle, a control state switching unit that switches the control unit to an operating state in response to a first operation (e.g., an ON operation) of a manual operation device, and switches the control unit to a dormant state in response to a second operation (e.g., an OFF operation) of the manual operation device, a charging power connection unit that receives charging power for the battery, and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, The charging mode is set by the charging power connection unit being connected for charging and the manual operation device being operated from the second operation state to the first operation state. do.

[0007] With this configuration, even if the battery has finished charging, the electric motor will not start unless the start prohibition is released, because the start prohibition is still prohibited by the start prohibition unit. This prevents a third party from driving and stealing an electric work vehicle whose battery has finished charging.

[0008] The start inhibition of the electric motor by the start inhibition unit must be released by the authorized driver (manager) of the electric work vehicle. It is preferable that this release operation be as simple as possible for the authorized driver of the electric work vehicle. For this reason, in the present invention, the start inhibition by the start inhibition unit is released by operating the first operation of the manual operation device. It is advantageous if this manual operation device also serves as an operation key required for operations that enable boarding the electric work vehicle (such as opening the doors).

[0009] In one embodiment, charging is initiated by issuing a charge start command through operation of a manual operation device in a charging mode. In such an embodiment, if charging of the battery does not start even after the charge start command is issued, it is deemed that some kind of abnormality has occurred. Therefore, in such a case, it is preferable to cut off power to the control unit. Therefore, in one embodiment, if charging of the battery does not start within a predetermined time (e.g., within one minute) after the charge start command is issued in the charging mode, power to the control unit is cut off.

[0010] If the second operation state (OFF state) using the manually operated device is maintained when charging of the battery is completed, it is considered that operation of the control system will not be necessary for at least a while, and therefore it is preferable from the viewpoint of energy saving and theft prevention to cut off the power supply to the control unit. For this reason, in the present invention, if the second operation state using the manually operated device is maintained after charging of the battery is completed, the power supply to the control unit is cut off.

[0011] Furthermore, if the control system is in an operating state when charging of the battery is completed, there is a possibility that operation of the control system will be required immediately, so it is preferable to maintain that state for a while and then cut off the power to the control unit after a predetermined time has elapsed. For this reason, in the present invention, if the first operation state (ON state) using the manual operation device is maintained after charging of the battery is completed, the power to the control unit is cut off after a predetermined time has elapsed (for example, after one minute).

[0012] In a work mode in which the electric work vehicle is capable of traveling, even if a motor start command is issued to the electric motor using a manual operation device so that the control system of the control unit can control the traveling, the electric motor may not enter a startable state. In such a case, it is considered that a problem has occurred in the control unit, etc. Therefore, in order to avoid inconveniences caused by such a problem, in the present invention, if the electric motor does not enter a started state after a motor start command is issued in the work mode, the power supply to the control unit is cut off after a predetermined waiting time.

[0013] If the electric motor stops due to an error, it is necessary to prevent damage to the control system centered around the control unit. For this reason, in the present invention, if the electric motor stops due to an error, the power supply to the control unit is cut off.

[0014] In a preferred embodiment of the present invention, the control unit stops the electric motor in response to the power supply line from the power supply device being connected to the charging power connector, thereby preventing the electric motor from operating unexpectedly while the battery is being charged.

[0015] A charging mode needs to be set in order to charge the battery after the power supply line is connected to the charging power connection portion. This charging mode is preferably set through a conscious operation by the driver. Therefore, in one embodiment of the present invention, the charging mode is set by connecting the power supply line to the charging power connection portion and operating the manually operated device from the second operation state to the first operation. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. 2 is a left side view showing the arrangement of the motor and the driving battery. [Figure 3] FIG. 2 is a schematic diagram showing the flow of power transmission. [Figure 4] FIG. 2 is a functional block diagram showing functional units of the battery system. [Figure 5] FIG. 2 is a chart illustrating an example of a control flow in a control system. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of arrow F in the drawings will be defined as "front," the direction of arrow B as "rear," the direction of arrow L as "left," and the direction of arrow R as "right." The direction of arrow U in the drawings will be defined as "up," and the direction of arrow D as "down."

[0018] [Overall configuration of the tractor] The following describes a tractor as an example of an electric work vehicle according to the present invention. As shown in Figure 1, the tractor has left and right front wheels 10, left and right rear wheels 11, and a cover member 12.

[0019] The tractor includes a machine frame 2 and a driving section 3. The machine frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11. A cover member 12 is disposed at the front of the machine. The driving section 3 is disposed behind the cover member 12.

[0020] The driver's section 3 has a protective frame 30, a driver's seat 31, and a steering wheel 32. The steering wheel 32 can be operated by a driver who is seated in the driver's seat 31 while aboard the driver's section 3. The left and right front wheels 10 are steered by operating the steering wheel 32. A front panel 13 is provided in front of the driver's seat 31, and a part of the front panel 13 is formed as a meter panel 13a. A display unit 70 that notifies the driver of various information is incorporated in the meter panel 13a. The driver can perform various driving operations using the driver's section 3.

[0021] The tractor is equipped with a battery 4, which is a traction battery. A cover member 12 can swing open and closed around an opening and closing axis Q that runs along the left-right direction of the vehicle body. When the cover member 12 is in a closed state, the battery 4 is covered by the cover member 12. A charging cover 12a is provided on the left side surface of the front portion of the cover member 12 so that it can swing open and closed. When this charging cover 12a is opened, a charging power connection portion 44 into which a power supply cable is inserted during charging is exposed.

[0022] As shown in Fig. 2, the tractor includes an inverter 14 and an electric motor 1. The battery 4 supplies power to the inverter 14. The inverter 14 converts DC power from the battery 4 into AC power to generate driving power to be supplied to the electric motor 1. The driving power is AC power generated by the inverter 14.

[0023] 2 and 3, the tractor is equipped with a hydrostatic continuously variable transmission 15 and a transmission 16. As shown in Fig. 3, the hydrostatic continuously variable transmission 15 has a hydraulic pump 15a and a hydraulic motor 15b.

[0024] The hydraulic pump 15a is driven by rotational power from the electric motor 1. When the hydraulic pump 15a is driven, rotational power is output from the hydraulic motor 15b. The hydrostatic continuously variable transmission 15 is configured so that the speed of the rotational power is continuously changed between the hydraulic pump 15a and the hydraulic motor 15b.

[0025] The rotational power output from the hydraulic motor 15b is transmitted to the transmission 16. The rotational power transmitted to the transmission 16 is changed in speed by a gear-type speed change mechanism of the transmission 16 and distributed to the left and right front wheels 10 and the left and right rear wheels 11. In this way, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0026] As shown in Fig. 3, the tractor is equipped with a mid PTO shaft 17 and a rear PTO shaft 18. The rotational power output from the electric motor 1 is distributed to the hydraulic pump 15a, the mid PTO shaft 17, and the rear PTO shaft 18. This causes the mid PTO shaft 17 and the rear PTO shaft 18 to rotate.

[0027] If a working device is connected to the mid PTO shaft 17 or the rear PTO shaft 18, the working device will be driven by the rotational power of the mid PTO shaft 17 or the rear PTO shaft 18. For example, as shown in FIG. 2, in this embodiment, a brush cutting device 19 is connected to the mid PTO shaft 17. The brush cutting device 19 is driven by the rotational power of the mid PTO shaft 17.

[0028] [Motor / battery control system configuration] FIG. 4 shows a schematic diagram of the configuration related to the control of the battery 4 and electric motor 1. The motor-battery control system includes an accelerator device 33, a key device 34, a control unit 6, and an inverter 14. The control unit 6 controls the operation of the electric motor 1. The accelerator device 33 is provided near the steering wheel 32. Although the structure of the accelerator device 33 is not shown, the accelerator device 33 includes a lever that can be swung and a potentiometer that is operated by swung operation of the lever. The accelerator device 33 is connected to the control unit 6.

[0029] A key device 34 is also connected to the control unit 6. The key device 34 is provided on the front panel 13 and performs an ON / OFF operation on the control unit 6. In this embodiment, the key device 34 comprises a control state switching unit 35 and a portable operation key 36. The control state switching unit 35 is provided with a plug-in portion 35a into which the operation key 36 can be inserted and a push-button switch 35b that is manually pressed. The operation key 36 and the switch 35b function as a manual operation device of the present invention. In this embodiment, pressing the switch 35b when the operation key 36 is inserted and attached to the plug-in portion 35a is considered a first operation (ON operation) of the manual operation device. Furthermore, pressing the switch 35b when the operation key 36 is inserted and attached to the plug-in portion 35a is considered a second operation (OFF operation) of the manual operation device. In response to a first operation of the manually operated device, the control state switching unit 35 sends a switching signal to the control unit 6 to switch the control unit 6 to an operating state (power-on state: ON state). In response to a second operation of the manually operated device, the control state switching unit 35 sends a switching signal to the control unit 6 to switch the control unit 6 to a sleep state (power-off state: OFF state). The operation key 36 functions as a key that can only be identified in the work vehicle, similar to a key for a general vehicle.

[0030] The control unit 6 is further connected to the inverter 14, and issues a drive command to the inverter 14 in response to a command from the accelerator device 33. The inverter 14 adjusts the power supplied from the battery 4 to the electric motor 1 in response to a command from the control unit 6, thereby controlling the output of the electric motor 1.

[0031] The control unit 6 is also connected to a display control unit 7. The display control unit 7 visually or audibly notifies the driver of, for example, the driving state, the working state, and battery information (charge amount and temperature) through devices that notify the driver of information, such as a display unit 70, lamps, and buzzers, which are incorporated in the meter panel 13a.

[0032] The battery 4 is charged by the charging control unit 43 from a power supply device 45 connected to a charging power connection unit 44. A power supply socket is provided in the charging power connection unit 44, and during charging, the power supply socket is connected to a power supply connector of a charging cable from the power supply device 45.

[0033] The battery 4 is, for example, a lithium-ion battery, and is configured by stacking a large number of battery cells 40, which are small, low-voltage unit cells. A battery state detection unit 5 that detects the battery state includes a battery voltage detector 51 and a battery temperature detection unit 52. The battery voltage detector 51 can detect the voltage at the connection point between the plurality of battery cells 40 connected in series as the cell voltage. Detection signals from the battery voltage detector 51 and the battery temperature detection unit 52 are sent to a control unit 6.

[0034] In addition to the battery 4, the tractor is also provided with an electrical equipment battery 41 that supplies power to the control unit 6 and other electrical equipment. The electrical equipment battery 41 supplies low-voltage (12 volt) power to drive the electrical equipment. The electrical equipment battery 41 is charged with power supplied from the battery 4 via a DC / DC converter 42. The DC / DC converter 42 is driven and controlled by the control unit 6.

[0035] The control unit 6 includes a battery management section 60, a motor control section 61, a mode setting section 62, a start inhibition section 63, and a start inhibition release section 64 as functional elements particularly related to the present invention.

[0036] The control unit 6 can be set to a charging mode that enables charging of the battery 4, and a working mode that enables driving of the electric motor 1. The setting of these two modes is performed by a mode setting section 62.

[0037] The start inhibition unit 63 inhibits the starting of the electric motor 1. The start inhibition release unit 64 releases the start inhibition of the electric motor 1 by the start inhibition unit 63. For example, in one use example of electric motor start inhibition, the start inhibition unit 63 inhibits the starting of the electric motor 1 after charging of the battery 4 is completed. As a result, the electric motor 1 will not start unless some special operation is performed after charging is completed, thereby preventing theft of a tractor that has finished charging. In another use example, when it is detected that the power supply connector of the charging cable from the power supply device 45 is inserted into the power supply socket of the charging power connection unit 44, the start inhibition unit 63 inhibits the starting of the electric motor 1. As a result, the electric motor 1 will not start while the power supply connector of the charging cable is inserted into the charging power connection unit 44. In any case, the start prohibition of the electric motor 1 by the start prohibition unit 63 is released by the start prohibition release unit 64 upon receiving an operation by the driver (manager) using a manual operation device, for example, a confirmation signal for the operation of the first operation.

[0038] The battery management unit 60 manages the charging and discharging of the battery 4 based on the cell voltage, the inverter total voltage, the converter input voltage, a signal from the key device 34, and the like. For example, when it is detected that the power supply connector of the charging cable from the power supply device 45 has been inserted into the power supply socket of the charging power connection unit 44 and when it is detected that the manual operation device has been operated from the second operation state to the first operation, the mode setting unit 62 sets the control unit 6 to the charging mode. More specifically, when the power supply connector of the charging cable is inserted into the charging power connection unit 44, the control unit 6 enters a charging standby state. In this charging standby state, when the control state switching unit 35 sends a switching signal (a first operation that functions as a charging start command) to the control unit 6 by operating the key device 34, the control unit 6 enters the charging mode, the charging program of the charging control unit 43 is executed, and charging of the battery 4 is started. When the charging process of the battery 4 is completed and the control state switching unit 35 sends a switching signal (second operation) to the control unit 6 to switch the control unit 6 to a sleep state, the power is cut off and the control unit 6 enters a sleep state. If a first operation is performed using the manual operation device during charging, the control unit 6 enters a charge standby state and the charging process is interrupted.

[0039] In this embodiment, with the charging cable plugged into the charging power connection portion 44, for example, a first operation using a manual operation device switches the control unit 6 from a sleep state to an active state, issues a charging start command, and starts charging. At this time, if charging of the battery 4 does not start even when the first operation using the manual operation device is performed to start charging, it is assumed that some kind of abnormality has occurred. To avoid secondary problems due to the occurrence of such an abnormality, if charging of the battery 4 does not start within a predetermined time after the first operation even when a charging start command is issued, the control unit 6 may be switched to a sleep state and the power supply to the control unit 6 may be cut off. Note that a different operation method or a different operation device may be used to start charging.

[0040] The motor control unit 61 controls the driving of the electric motor 1. Specifically, based on a signal from the accelerator device 33, the motor control unit 61 generates a driving signal for driving the electric motor 1 and provides the driving signal to the inverter 14.

[0041] The control system mounted on this tractor, including the control unit 6, is capable of executing various control processes relating to battery charging and electric motor control. Such control processes are listed below. (1) When charging of the battery 4 is completed, if the second operation state (OFF state) by the manual operation device is maintained, the power supply to the control unit 6 is cut off. (2) When charging of the battery 4 is completed, if the first operation state (ON state) using the manual operation device is maintained, the power supply of the control unit 6 is cut off (OFF state) after a predetermined time has elapsed. (3) In a work mode in which travel control is possible, if the electric motor 1 does not transition to a starting state even when a motor start command is issued, the power to the control unit 6 is cut off after a predetermined waiting time (for example, after 5 seconds). (4) If an error occurs and the electric motor stops, the power supply to the control unit 6 is cut off so that the control system centered around the control unit 6 is not affected. (5) In response to the connection of the power supply line from the power supply device 45 to the charging power connection unit 44, not only is the start-up prohibited but also, if the electric motor 1 is in an operating state, it is stopped. It is also possible to treat the start-up prohibition of the electric motor 1 and the stopped state of the electric motor 1 as equivalent. (6) When the battery condition deteriorates, such as when the battery voltage drops or the battery temperature rises, the output of the electric motor 1 is limited to a preset limit output value.

[0042] Next, an example of the control flow in the control unit 6 will be explained using the chart shown in Figure 5. In this chart, the control unit 6 is divided into a resting state in which the power supply is cut off and an operating state in which the power supply is connected. The operating state is further divided into a work mode in which the tractor can travel and a charge mode in which the battery 4 can be charged.

[0043] A tractor parked in a resting state transitions to an operating state when the key device 34 is turned on (#a). The key device 34 is turned on to trigger control by the control unit 6, and the initial processing of various functions is executed (#b). When the initial processing is completed, it is determined whether the tractor is in a state where a charging connection has not been made (no charging connection) or a state where a charging connection has been made (charging connection).

[0044] If there is no charge connection (#c1), the tractor enters work mode and waits. When a motor start command is issued (#d), a check is made to see if the motor is in a started or non-started state. If the motor is in a started state (#d1), the tractor enters a running state (including a temporary stop) (#e). When the tractor is in a running state, if the key device 34 is turned off and a charge connection is detected, parking processing (stop processing) (#f) is performed. When the parking processing is completed (#g), power to the control unit 6 is cut off, the tractor enters a pause state, and the tractor enters a parked state. If the motor does not enter a started state even after a predetermined time has elapsed (#d2) despite the issuance of a motor start command (#d), the tractor enters a parking processing (stop processing) (#f) and enters a pause state.

[0045] After the initial process (#b) is completed, when the charging cable from the power supply device 45 is connected to the charging power connection unit 44, the system enters a charging standby state (#h). In the charging standby state, when the key device 34 is turned on from the OFF state, a charging start command is issued (#i1), and the system enters charging mode. In other words, after the charging cable from the power supply device 45 is connected to the charging power connection unit 44, in order to transition to charging mode, the key device 34 needs to be turned from OFF to ON.

[0046] When the tractor enters the charging mode, the charging control unit 43 performs the charging process for the battery 4 (#j). During the charging process, the control unit 6 is connected to the power source. When the charging process is completed, the start prohibition unit 63 prohibits the starting of the electric motor 1 (#l). When the charging process is completed, if the operation state of the key device 34 is OFF (#m1), the power supply to the control unit 6 is cut off, the tractor enters a paused state, and the tractor enters a parked state. When the charging process is completed, if the operation state of the key device 34 is ON (#m2), the operation state of the key device 34 is forcibly changed to OFF (#m4) after a predetermined time (for example, one minute) has elapsed (#m3). As a result, the power supply to the control unit 6 is cut off, the control unit 6 enters a paused state, and the tractor enters a parked state.

[0047] If charging has not started despite the issuance of a command to start charging (#k), after a predetermined time has elapsed (#n), power to the control unit 6 is cut off, the control unit 6 goes into a sleep state, and the tractor goes into a parked state.

[0048] In the charging standby state, if the key device 34 is turned OFF and the charging cable is not connected for a predetermined time (e.g., 5 seconds) (#i2), the tractor does not enter charging mode, the power to the control unit 6 is cut off, the tractor enters a hibernation state, and the tractor enters a parked state.

[0049] If the electric motor 1 is in a driving state when the charging cable from the power supply device 45 is connected to the charging power connection unit 44, the control unit 6 puts the electric motor 1 in a stopped state (non-driving state), and at this time, the start prohibition unit 63 may also function to prohibit the starting of the electric motor 1. Of course, the transition of the electric motor 1 to a stopped state (non-driving state) and the prohibition of starting the electric motor 1 may be performed jointly by the start prohibition unit 63. Stopping and prohibiting the start of the electric motor 1 can be achieved by stopping the supply of power to the electric motor 1, but may also be achieved by stopping the inverter 14.

[0050] [Another embodiment] (1) In the above embodiment, the manual operation device of the key device 34 is configured with the operation key 36 that can be inserted into the insertion portion 35a and the switch 35b, but instead of this configuration, the manual operation device may be configured to perform ON / OFF operations via wireless communication. The configuration of the key device 34 is flexible.

[0051] (2) Each functional block in the functional block diagram shown in FIG. 4 may be divided into multiple blocks, or multiple functional blocks may be integrated.

[0052] The configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction arises. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0053] The present invention is not limited to tractors, but can also be applied to various electric work vehicles such as rice transplanters, combine harvesters, and construction machinery. [Explanation of symbols]

[0054] 1: Electric motor 2: Aircraft frame 3: Driving section 4: Battery 5: Battery status detection section 6: Control unit 7: Display control unit 10: Front wheel 11: Rear wheel 12: Cover member 13: Front panel 13a: Meter panel 14: Inverter 15: Hydrostatic continuously variable transmission 15a: Hydraulic pump 15b: Hydraulic motor 16: Transmission 17: Mid PTO shaft 18: Rear PTO shaft 19: Grass cutting device 30: Protective frame 31: Driver's seat 32: Steering wheel 33: Accelerator 34: Key device 35: Control state switching unit 35a: Assembly section 35b: Switch 36: Operation keys 40: Battery cell 41: Battery for electrical equipment 42: DC / DC converter 43: Charging control unit 44: Charging power connection 45: Power supply device 51: Battery voltage detector 52: Battery temperature detection unit 60: Battery management unit 61: Motor control unit 62: Mode setting section 63: Start inhibit section 64: Start prohibition release section 70: Display unit

Claims

1. An electric work vehicle driven by the power of an electric motor supplied with power from a rechargeable battery, the electric work vehicle is provided with a control unit that controls the electric work vehicle; a control state switching unit that switches the control unit to an operating state in response to a first operation of a manual operation device and switches the control unit to a sleep state in response to a second operation of the manual operation device; a charging power connection unit that receives charging power for the battery; and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, The start inhibition by the start inhibition unit is released by operating the first operation of the manually operated device.

2. An electric work vehicle driven by the power of an electric motor supplied with power from a rechargeable battery, the electric work vehicle is provided with a control unit that controls the electric work vehicle; a control state switching unit that switches the control unit to an operating state in response to a first operation of a manual operation device and switches the control unit to a sleep state in response to a second operation of the manual operation device; a charging power connection unit that receives charging power for the battery; and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, The electric work vehicle according to claim 1, wherein if charging of the battery does not start within a predetermined time after a command to start charging is issued in the charging mode, power to the control unit is cut off.

3. An electric work vehicle driven by the power of an electric motor supplied with power from a rechargeable battery, the electric work vehicle is provided with a control unit that controls the electric work vehicle; a control state switching unit that switches the control unit to an operating state in response to a first operation of a manual operation device and switches the control unit to a sleep state in response to a second operation of the manual operation device; a charging power connection unit that receives charging power for the battery; and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, In the electric work vehicle, if the first operation state using the manual operation device is maintained after charging of the battery is completed, power to the control unit is cut off after a predetermined time has elapsed.

4. An electric work vehicle driven by the power of an electric motor supplied with power from a rechargeable battery, the electric work vehicle is provided with a control unit that controls the electric work vehicle; a control state switching unit that switches the control unit to an operating state in response to a first operation of a manual operation device and switches the control unit to a sleep state in response to a second operation of the manual operation device; a charging power connection unit that receives charging power for the battery; and a charging control unit that controls charging of the battery with the charging power, the control unit includes a motor control unit that controls driving of the electric motor, a mode setting unit that sets a charging mode that enables charging of the battery and a working mode that enables driving of the electric motor, a start prohibition unit that prohibits starting of the electric motor after charging is completed, and a start prohibition release unit that releases the prohibition on starting the electric motor, The electric work vehicle is configured to set the charging mode when the charging power connection unit is connected for charging and the manually operated device is operated from the second operation state to the first operation state.

5. The electric work vehicle according to claim 1 , wherein, after charging of the battery is completed, if the second operation state using the manual operation device is maintained, power to the control unit is cut off.

6. 2. The electric work vehicle according to claim 1, wherein if the electric motor does not transition to a started state after a motor start command is issued in the work mode, power to the control unit is cut off after a predetermined waiting time.

7. 2. The electric work vehicle according to claim 1, wherein when the electric motor stops due to an error, the power supply to the control unit is cut off.

8. The electric work vehicle according to claim 1, wherein the control unit stops the electric motor in response to a power supply line from a power supply device being connected to the charging power connection section.

Images