JP3543937B2 - Electric drive work vehicle - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrically driven work vehicle that drives a motor using electric power of a battery, and drives a traveling device or a work device with the power of the motor.
[0002]
[Prior art]
As such an electrically driven work vehicle, for example, an electrically driven high work vehicle is known. The electric drive type aerial work vehicle is configured such that a body having a traveling device is provided with a boom that can be raised, lowered, extended, and swiveled, and a work platform for mounting the work vehicle is attached to a tip end of the boom. A battery is provided in the vehicle body, and an electric motor (electric motor) is operated using the electric power of the battery, and the generated power is transmitted to a traveling device and a hydraulic pump by a power transmission device called a PTO (power take-off) mechanism. The transmission is switched to one of the two modes. Therefore, when the traveling device is driven by the electric motor, road traveling is possible, and when the hydraulic pump is driven by the electric motor, actuators such as the up-and-down cylinder, the telescopic cylinder, and the turning motor can be operated, and the boom can be operated. Raising, expanding, contracting, and turning operations are possible. Such an electric drive type work vehicle generates less noise because power is obtained from a battery, and is used for work in a place where it is not desirable to generate noise, such as a quiet residential area.
[0003]
In such an electrically driven work vehicle, it is necessary to charge the battery at any time, but there is also a vehicle (called a hybrid vehicle) equipped with a power generating engine for charging the battery. In such a vehicle, when the remaining capacity of the battery decreases and falls below the reference capacity, the engine for power generation is automatically started to charge the battery. This prevents the battery from running out of capacity and prevents a situation in which the vehicle cannot run or cannot operate the boom or the like.
[0004]
[Problems to be solved by the invention]
However, in consideration of the fact that such a vehicle consumes a large amount of power when traveling on a road, it is necessary to perform charging before the remaining capacity of the battery is not so low (for example, when the remaining capacity of the battery is fully charged). (Charging starts when it reaches about 60% of the time). For this reason, charging is started during work at the site and noise due to engine rotation is often generated. Regardless of running on a road, such noise is generated in an environment where it is not desirable to generate noise such as a quiet residential area. There was a problem. In addition, the operator may be impatient to finish the operation before the engine is started, which is not preferable in terms of safety.
[0005]
The present invention has been made in view of such a problem, and there are few cases in which charging of a battery is started during work to cause noise due to engine rotation, and an electric drive type that is easy to work even in a quiet residential area. The purpose is to provide a working vehicle.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, an electric drive type working vehicle according to the present invention includes a vehicle body having a traveling device, a working device provided on the vehicle body, and an electric motor capable of selectively driving the traveling device and the working device. A battery that supplies electric power to the electric motor, a power transmission device (for example, the PTO mechanism 33 in the embodiment) that switches and transmits the power of the electric motor to one of the traveling device and the working device, and a power generation that charges the battery. , An engine that drives the generator, capacity detection means (for example, capacity detector 45 in the embodiment) for detecting the remaining capacity of the battery, and the remaining capacity of the battery detected by the capacity detection means are predetermined. Starts the engine when it detects that it has fallen below the reference capacity and stops when it detects that the remaining capacity has reached full charge. Charge means (for example, the controller 37 in the embodiment), and further, a charge command means (for example, the forced power generation switch 54 in the embodiment) for instructing start and stop of charging of the battery by manual operation. ). The engine start / stop means starts the engine when a charge start command is issued by the charge command means, and stops the engine when a charge stop command is issued by the charge command means, regardless of the state of charge of the battery. In addition, the first reference capacity during road running and the second reference capacity during work are set as the reference capacity, and the second reference capacity is set to a value smaller than the first reference capacity.
An electric drive type work vehicle according to a second aspect of the present invention includes a vehicle body having a traveling device, a work device provided on the vehicle body, an electric motor capable of selectively driving the travel device and the work device, and an electric power source for the electric motor. , A power transmission device (for example, the PTO mechanism 33 in the embodiment) for switching and transmitting the power of the electric motor to one of the traveling device and the working device, a generator for charging the battery, and a generator , An engine operation mode switching unit that switches the operation mode of the engine to one of the AUTO mode and the ON mode, and a capacity detection unit that detects the remaining capacity of the battery (for example, the capacity detector 45 in the embodiment). (For example, the engine operation mode changeover switch 55 in the embodiment) and a switch for performing disconnection changeover of electrical connection between the battery and the generator. And when the engine operation mode switching means is switched to the AUTO mode, the engine is started when it is detected that the remaining capacity of the battery detected by the capacity detection means has fallen below a predetermined reference capacity. The engine is stopped when it is detected that the state of charge has reached a full charge. When the engine operation mode switching means is switched to the ON mode, the engine is started and the engine is operated. And when the switch electrically connects the battery and the generator when it is detected that the remaining capacity has fallen below a predetermined reference capacity, and when it is detected that the remaining capacity has reached a full charge. The engine start / stop means (for example, in the embodiment) for disconnecting the electrical connection between the battery and the generator by a switch Kicking the controller 37) is constructed and a charge command means for performing a command for charging start and stop of the battery at manual operation (for example, forced in an embodiment power switch 54). The engine start / stop means starts the engine when there is a charge start command by the charge command means, and stops the engine when there is a charge stop command by the charge command means, regardless of the remaining capacity. Features.
Furthermore, an electric drive type working vehicle according to a third aspect of the present invention provides a vehicle body having a traveling device, a working device provided on the vehicle body, an electric motor capable of selectively driving the traveling device and the working device, and an electric motor. , A power transmission device (for example, the PTO mechanism 33 in the embodiment) for switching and transmitting the power of the electric motor to one of the traveling device and the working device, a generator for charging the battery, and a generator , The capacity detecting means for detecting the remaining capacity of the battery (for example, the capacity detector 45 in the embodiment), and the remaining capacity of the battery detected by the capacity detecting means falls below a predetermined reference capacity. Engine start / stop means for starting the engine when detecting that the remaining capacity is equivalent to full charge, and stopping the engine when detecting that the remaining capacity has reached a full charge (for example, It is configured with a controller 37) and the facilities form
Further, a charge instructing unit (for example, the forced power generation switch 54 in the embodiment) for instructing the start and stop of charging of the battery by a manual operation is provided. The engine start / stop means starts the engine when a charge start command is issued by the charge command means, and stops the engine when a charge stop command is issued by the charge command means, regardless of the state of charge of the battery. With When driving after starting the engine It is characterized by having a low-speed mode in which the battery is charged at a constant engine speed.
[0007]
In this electric drive type working vehicle, charging is automatically started when the remaining capacity of the battery falls below a predetermined reference capacity, regardless of the remaining capacity of the battery, The battery can also be charged by instructing the start of charging of the battery by the charge instructing means, so that sufficient charging can be performed in advance in preparation for work in a place where noise is not desired. . For this reason, the number of cases in which charging is started during work and noise is generated due to engine rotation is reduced, and work becomes easy even in a quiet residential area. In addition, since the working time can be spared and the worker has a sufficient time, the safety of the work can be improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an electric drive type aerial work vehicle 10 which is an electric drive type work vehicle according to the present invention. The vehicle body 11 of the aerial work vehicle 10 is configured based on a truck, and has a driver's seat 11 a and a plurality of traveling wheels 12. A swivel 13 is provided on the vehicle body 11, and a boom 14 in which a plurality of columnar members are assembled in a nesting manner is attached to the swivel 13.
[0009]
The swivel base 13 is driven by a swivel motor 15 built in the vehicle body 11 and is capable of swiveling in a horizontal plane. The boom 14 can be extended and contracted in the longitudinal direction by the operation of a built-in telescopic cylinder 16, and can be raised and lowered by the operation of an undulating cylinder 17 provided between the boom 14 and the swivel table 13. Outrigger jacks 20 are provided on the front, rear, left and right sides of the vehicle body 11 to extend laterally and downwardly of the vehicle body 11 to support the vehicle body 11 by operation of an outrigger cylinder 18 and a jack cylinder 19 (both not shown in FIG. 2). ing.
[0010]
A vertical post 21 is attached to the distal end of the boom 14 so as to be able to swing back and forth, and a work table 22 for an operator to board is mounted on the vertical post 21 so as to be able to swing horizontally. In addition, a leveling device (not shown) is provided near the vertical post 21, whereby the workbench 22 is always kept horizontal regardless of the up-and-down state of the boom 14.
[0011]
As shown in FIG. 1, the swing motor 15, the telescopic cylinder 16, the up-and-down cylinder 17, the outrigger cylinder 18, and the jack cylinder 19 (hereinafter, referred to as actuators 15 to 19) are supplied from a hydraulic pump 35 provided in the vehicle body 11. It is designed to operate by receiving hydraulic oil. The supply of the hydraulic oil is controlled by the controller 37 based on an operation signal output by a lever operation of the upper operation device 23 provided on the work table 22 or the lower operation device 24 provided on the rear portion of the vehicle body 11. 36 is performed by electromagnetically driving. The hydraulic pump 35, the actuators 15 to 19, the swivel base 13, the boom 14, and the outrigger jack 20 constitute a working device described in the claims.
[0012]
The traveling wheels 12 are connected to a transmission 34, and by supplying power to the transmission 34, the aerial work vehicle 10 can travel. The transmission 34 has a clutch and a transmission (both not shown). The clutch and the transmission are controlled by a clutch pedal and a shift lever (both not shown) provided in the driver's seat 11a. Operable. The transmission device and the traveling wheels 12 constitute a traveling device described in the claims.
[0013]
As shown in FIG. 1, the power source of the aerial work vehicle 10 is a battery 31, and an electric motor (electric motor) 32 is operated using the electric power of the battery 31. The electric motor 32 can selectively drive the traveling device (directly, the transmission 34) and the working device (directly, the hydraulic pump 35). 35 to be transmitted.
[0014]
The PTO mechanism 33 operates in response to a signal from the controller 37 to perform the above switching. A PTO switch 38 for switching the PTO mechanism 38 is provided in the driver's seat 11a. When an off signal is output from the PTO switch 38, the controller 37 controls the power of the electric motor 32 to change the speed of the transmission device. The PTO mechanism 33 is operated so that the power is transmitted to the hydraulic pump 35, and when the ON signal is output, the PTO mechanism 33 is operated such that the power of the electric motor 32 is transmitted to the hydraulic pump 35. Therefore, when the PTO changeover switch 38 is off, the transmission 34 is driven by the electric motor 32 to drive on the road (the actuators 15 to 19 cannot be operated), and when the PTO changeover switch 38 is turned on, the electric motor 32 operates. When the hydraulic pump 35 is driven, the operation of the actuators 15 to 19 (the operation of the swivel base 13, the boom 14, and the outrigger jack 20) is possible (the vehicle cannot travel on the road).
[0015]
As shown in FIG. 1, the electric power of the battery 31 is supplied to the electric motor 32 through a power supply line 39. One switch 40 is provided. The opening / closing operation of the first switch 40 is performed by a main switch 41 (not shown in FIG. 2) provided in the driver's seat 11a, and the controller 37 outputs the first signal when the main switch 41 outputs an ON signal. The switch 40 is closed, and when the off signal is output, the first switch 40 is opened. Therefore, the electric motor 32 can be started and stopped by turning on and off the main switch 41. When the main switch 41 is turned off, the PTO switch 38 is automatically turned off (an off signal is output to the controller 37). Only possible.
[0016]
Further, an engine 42 and a generator 43 driven by the engine 42 to generate power and charge the battery 31 are provided in the vehicle body 11. The engine 42 is connected to the controller 37 via a starter motor (not shown), and the start and stop of the engine 42 are controlled by the controller 37. The electric power at the time of starting the engine 42 is supplied from the battery 31 based on a signal from the controller 37 (however, not shown in FIG. 1). Here, the generator 43 may be a DC generator (dynamo) or an AC generator (alternator), but the AC generator is preferable because the power generation performance during low-speed rotation of the engine 42 is good.
[0017]
As shown in FIG. 1, a second switch 44 is provided between the generator 43 and the battery 31. The second switch 44 normally supplies power from the generator 43 to the battery 31 in a closed state, but when a signal is output from the controller 37, the second switch 44 opens to cut off the power supply. For this reason, even when the engine 42 is operating and the generator 43 is driven, the charging of the battery 31 can be stopped by opening the second switch 44. Further, the battery 31 is provided with a capacity detector 45 for detecting the remaining capacity of the battery 31, and detection information from the capacity detector 45 is input to the controller 37. The capacity detector 45 detects the remaining capacity from the electromotive force of the battery 31. The power consumption is obtained by measuring the magnitude of the current flowing through the power supply line 39 and the time required to calculate the remaining power. Or the like.
[0018]
As shown in FIG. 2, a front operation device 25 and a rear operation device 26 are provided in the driver's seat 11 a and the rear portion of the vehicle body 11, respectively. The operation devices 25 and 26 control the charge pattern of the battery 31. I can do it. FIG. 3 shows the appearance of the front and rear operation devices 25 and 26 (the appearances of both are the same). As shown in the figure, a PTO operation confirmation lamp 51, an operation enable confirmation lamp 52, and a capacity reduction confirmation lamp 53 are provided at the upper stage of the operation panel 50 from the right, and a forced power generation switch 54 and an engine operation are arranged at the middle stage from the right. A mode changeover switch 55 and an accelerator mode changeover switch 56 are provided, and a power generation confirmation lamp 57, an engine operation confirmation lamp 58, and a total hour meter 59 are provided at the lower stage from the right.
[0019]
Here, the PTO operation confirmation lamp 51 is turned on when the PTO changeover switch 38 is on, so that it is possible to confirm whether the vehicle can travel on the road or the actuators 15 to 19 can operate. Has become. That is, when the PTO changeover switch 38 is off, only road running is possible (the actuators 15 to 19 cannot be operated), and when the PTO switch 38 is on, only the actuators 15 to 19 can be operated (road running cannot be performed). ).
[0020]
The operation permission lamp 52 is illuminated when the switches 54 to 56 of the front and rear operation devices 25 and 26 are usable (input possible). That is, when the main switch 41 is on and the PTO switch 38 is off and only road running is possible, the lamp 52 on the front operation device 25 is turned on (the lamp 52 on the rear operation device 26 is off). When the main switch 41 is on and the PTO changeover switch 38 is on and only the actuators 15 to 19 can be operated, the lamp 52 on the rear operating device 26 lights up (the lamp on the front operating device 25 side). 52 is off). Thereby, the operator can confirm whether or not the switches 54 to 56 can be used.
[0021]
The capacity reduction confirmation lamp 53 is turned on when the controller 37 detects that the remaining capacity of the battery 31 has become smaller than the reference capacity set at that time based on the detection information from the capacity detector 45. This alerts the worker to the lack of capacity of the battery 31. As will be described later, a different value is set for the reference capacity when the vehicle is running on the road (when the PTO switch 38 is off) and when the work is performed on site (when the PTO switch 38 is on).
[0022]
The forced power generation switch 54 is operated when it is desired to forcibly charge the battery 31 irrespective of the remaining capacity of the battery 31. The on / off signal output by the operation of the forced power generation switch 54 is input to the controller 37. When the controller 37 is turned on, the engine 42 is started by the controller 37, the charging of the battery 31 is started, and the off operation is performed. At times, the engine 42 is stopped and the charging ends.
[0023]
The engine operation mode changeover switch 55 has an ON mode and an AUTO mode and can be selected, and a signal corresponding to the selected mode is input to the controller 37. Here, when the controller 37 receives the AUTO mode signal, the controller 37 switches the engine 42 when detecting that the remaining capacity of the battery 31 detected by the capacity detector 45 has fallen below the reference capacity set at that time. The battery 31 is charged by being started, and when it is detected that the remaining capacity is equivalent to the full charge, the engine 42 is stopped to terminate the charging. On the other hand, when the ON mode signal is being input, the engine 42 is kept operating and the second switch 44 is opened, and it is detected that the remaining capacity of the battery 31 has fallen below the reference capacity set at that time. At this time, the second switch 44 is closed to charge the battery 31, and when it is detected that the remaining capacity is equivalent to the full charge, the second switch 44 is opened to terminate the charging (the engine 42 is stopped). Operation continues). The engine 42 is also a power source of an air conditioner (not shown) provided in the driver's seat 11a, and the ON mode is used when operating such an air conditioner (not shown).
[0024]
The accelerator changeover switch 56 has an automatic mode and a low speed mode and can be selected. The controller 37 controls the rotation speed of the engine 42 when the battery 31 is charged according to the selected mode. When the automatic mode signal is input, the controller 37 controls the rotation speed of the engine 42 to be high at the beginning of charging, and to be low thereafter. When the engine 42 rotates at a high speed, a large current is generated, and when the engine 42 rotates at a low speed, a small current is generated. However, by performing such control, the electrode active material density of the battery 31 is kept constant, and charging is performed efficiently. Can be. On the other hand, when the low-speed mode signal is input, the rotation speed of the engine 42 is always set to low speed, and the battery 31 is charged with a small current. In such a low-speed mode, the charging efficiency is not always good, but there is an advantage that noise generated by rotation of the engine 42 can be reduced.
[0025]
The power generation confirmation lamp 57 lights when the battery 31 is being charged. Thereby, the worker can confirm whether or not the battery 31 is currently being charged. The engine operation confirmation lamp 58 is turned on when the engine 42 is operating, so that the operator can confirm whether or not the engine 42 is operating. The engine operation confirmation lamp 58 is always lit when the forced power generation switch 54 is turned on or when the engine operation mode changeover switch 55 is set to the ON mode. The total hour meter 59 indicates the cumulative operating time of the engine 42 obtained by the controller 37.
[0026]
To perform an aerial work using the aerial work vehicle 10 having such a configuration, first, an operator (driver) who is in the driver's seat 11a turns on the main switch 41. As a result, the first switch 40 is closed, and the electric power from the battery 31 is supplied to the electric motor 32, so that the electric motor 32 operates. This also causes the operation enable lamp 52 of the front operation device 25 to light up (the operation enable lamp 52 of the rear operation device 26 remains off). As described above, the PTO changeover switch 38 is always off when the main switch 41 is turned on, and the electric motor 32 drives the transmission 34 (therefore, the PTO operation confirmation lamp 51 is turned off for both the front and rear operation devices 25 and 26). . In this state, road driving is possible, and the driver drives from the driver's seat 11a to move the vehicle body 11 to the work site.
[0027]
As described above, when the electric motor 32 is driving the traveling device (directly, the transmission 34), that is, when the OFF signal is output from the PTO switch 38 (during road traveling), the controller 37 performs the above-described operation. The reference capacity is set to the first reference capacity which is about 60% of the value when fully charged. Then, when the remaining capacity of the battery 31 decreases below the first reference capacity while the vehicle is traveling on the road, the capacity reduction confirmation lamp 53 is lit, and charging of the battery 31 is started (the power generation confirmation lamp 57 is lit). . Here, charging is started regardless of which of the AUTO mode and the ON mode is selected by the engine operation mode switch 55. When the battery 31 becomes fully charged, charging ends, and the capacity reduction confirmation lamp 53 is turned off (the power generation confirmation lamp 57 is also turned off). Here, the reason why the reference capacity (first reference capacity) when traveling on the road is set to a relatively high value of about 60% of that at the time of full charge is that the power consumed during traveling is large, and if the value is set to a very small value, the battery is not charged. This is because there is a possibility that the battery 31 may have a shortage of remaining capacity (overdischarge state).
[0028]
When the vehicle arrives at the work site after traveling on the road, the driver turns on the PTO switch 38. As a result, the PTO mechanism 33 is operated, and the electric motor 32 drives the hydraulic pump 35 (this causes the PTO operation confirmation lamps 51 of the front and rear operation devices 25 and 26 to light up). As a result, the operation permission lamp 52 of the front operation device 25 is turned off, and the operation permission lamp 52 of the rear operation device 26 is turned on instead. In this state, the actuators 15 to 19 can be operated, and the operator extends the outrigger jack 20 and operates the upper operation device 23 while riding on the work table 22 or operates the lower operation device 24 from the ground. By doing so, it is possible to operate the swivel base 13 and the boom 14 and move the work table 21 to a desired high place to perform a high place work.
[0029]
As described above, when the electric motor 32 drives the working device (directly the hydraulic pump 35), that is, when the ON signal is output from the PTO switch 38 (during work on site), the controller 37 The reference capacity is set to the second reference capacity which is about 30% of the value when fully charged. When the remaining capacity of the battery 31 falls below the second reference capacity during such work, the capacity reduction confirmation lamp 53 lights up, and charging of the battery 31 starts (the power generation confirmation lamp 57 lights up). Do). Here, charging is started regardless of whether the engine operation mode changeover switch 55 is set to the AUTO mode or the ON mode. When the battery 31 becomes fully charged, charging ends, and the capacity reduction confirmation lamp 53 is turned off (the power generation confirmation lamp 57 is also turned off). Here, the reason why the second reference capacity can be made smaller than the above-described first reference capacity is that the electric power consumed when driving the working device during work is the electric power consumed when driving the traveling device during road traveling. This is because the battery 31 is less likely to be short of remaining capacity (overdischarged state).
[0030]
Here, it is preferable that the low-speed mode is selected by the accelerator mode changeover switch 56 at the time of work at the site, so that even if charging is started during the work, the engine 42 is kept in the low rotation state. Since it is held, noise generated due to charging can be reduced.
[0031]
Also, as described above, by turning on the forced power generation switch 54, the battery 31 can be turned on at any time regardless of whether the vehicle is running on the road or working, and regardless of the remaining capacity of the battery 31. Since the battery can be charged, for example, the battery 31 can be charged in parallel with the work at a work site where there is no need to worry about noise, and it is sufficient to prepare for work in a place where noise is not desired. It is possible to keep the charging. However, in such a forced charging, charging is not automatically terminated even when the battery 31 is fully charged. Therefore, it is necessary to terminate the charging by turning off the forced power generation switch 54 at an appropriate time.
[0032]
As can be understood from the above description, in the electric drive type work vehicle (the high-place worker 10), charging is automatically started when the remaining capacity of the battery 31 falls below a predetermined reference capacity. However, regardless of the remaining capacity of the battery 31, the battery 31 can be charged by instructing (turning on) the charging start of the battery 31 by the forced power generation switch 54, so that the noise is reduced. It is possible to charge the battery sufficiently in advance in preparation for a work in a place where it is not desired to cause the problem. For this reason, the number of cases in which charging is started during the operation to generate noise due to the rotation of the engine 42 is reduced, and the operation becomes easy even in a quiet residential area. In addition, since the working time can be spared and the worker has a sufficient time, the safety of the work can be improved.
[0033]
Although the embodiment of the electric drive work vehicle according to the present invention has been described above, the present invention is not limited to the above-described work vehicle at a high place, and the traveling device and the power of the electric motor driven by the battery can be used. The configuration of the working device is not limited as long as the working device is operated.
[0034]
【The invention's effect】
As described above, in the electric drive work vehicle according to the present invention, charging is automatically started when the remaining capacity of the battery falls below a predetermined reference capacity. Regardless of the remaining capacity of the battery, the battery can also be charged by instructing the start of battery charging by the charge instructing means, so that a sufficient charge is prepared in advance in preparation for work in a place where noise is not to be generated. It is possible to carry out. For this reason, the number of cases in which charging is started during work and noise is generated due to engine rotation is reduced, and work becomes easy even in a quiet residential area. In addition, since the working time can be spared and the worker has a sufficient time, the safety of the work can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram mainly showing a power transmission system of an electric drive type working vehicle according to the present invention.
FIG. 2 is a perspective view showing the electric drive type working vehicle.
FIG. 3 is a diagram illustrating an appearance of a front operation device and a rear operation device.
[Explanation of symbols]
10 Work platforms (electrically driven work vehicles)
11 Body
31 Battery
32 electric motor
33 PTO mechanism (power transmission device)
34 Transmission (traveling device)
35 Hydraulic pump (working equipment)
37 Controller (engine start / stop means)
42 Engine
43 generator
45 capacity detector (capacity detection means)
54 Forced power switch (charge command means)

Claims (3)

A vehicle body having a traveling device,
A working device provided on the vehicle body,
An electric motor capable of selectively driving the traveling device and the working device,
A battery for supplying power to the electric motor;
A power transmission device that switches and transmits the power of the electric motor to one of the traveling device and the working device;
A generator for charging the battery,
An engine that drives the generator;
Capacity detection means for detecting the remaining capacity of the battery;
When the engine is started when it is detected that the remaining capacity of the battery detected by the capacity detection means has fallen below a predetermined reference capacity, and when it is detected that the remaining capacity has reached full charge An electric drive type work vehicle configured to include an engine start / stop unit that stops the engine,
Charge instruction means for instructing the start and stop of charging of the battery by manual operation,
The engine start / stop unit starts the engine when a charge start command is issued by the charge command unit, regardless of the remaining capacity, and starts the engine when a charge stop command is issued by the charge command unit. As well as
As the reference capacity, a first reference capacity when traveling on a road and a second reference capacity during work are set, and the second reference capacity is smaller than the first reference capacity. Work vehicle. A vehicle body having a traveling device,
A working device provided on the vehicle body,
An electric motor capable of selectively driving the traveling device and the working device,
A battery for supplying power to the electric motor;
A power transmission device that switches and transmits the power of the electric motor to one of the traveling device and the working device;
A generator for charging the battery,
An engine that drives the generator;
Capacity detection means for detecting the remaining capacity of the battery;
Engine operation mode switching means for switching the operation mode of the engine to one of an AUTO mode and an ON mode;
A switch that switches connection and disconnection of electrical connection between the battery and the generator,
When the engine operation mode switching means is switched to the AUTO mode, the engine is activated when it is detected that the remaining capacity of the battery detected by the capacity detection means falls below a predetermined reference capacity. The engine is stopped when it is detected that the state of charge has reached full charge, and when the engine operation mode switching means is switched to the ON mode, the engine is started. While the engine is kept operating, and when it is detected that the remaining capacity falls below a predetermined reference capacity, the switch electrically connects the battery and the generator, and the remaining capacity When the switch detects that the battery is fully charged, the switch electrically connects the battery and the generator. And engine start stopping means so as to release the connection,
Charge instruction means for instructing the start and stop of charging of the battery by manual operation,
The engine start / stop unit starts the engine when a charge start command is issued by the charge command unit, regardless of the remaining capacity, and starts the engine when a charge stop command is issued by the charge command unit. An electric drive type work vehicle characterized by stopping. A vehicle body having a traveling device,
A working device provided on the vehicle body,
An electric motor capable of selectively driving the traveling device and the working device,
A battery for supplying power to the electric motor;
A power transmission device that switches and transmits the power of the electric motor to one of the traveling device and the working device;
A generator for charging the battery,
An engine that drives the generator;
Capacity detection means for detecting the remaining capacity of the battery;
When the engine is started when it is detected that the remaining capacity of the battery detected by the capacity detection means has fallen below a predetermined reference capacity, and when it is detected that the remaining capacity has reached full charge An electric drive type work vehicle configured to include an engine start / stop unit that stops the engine,
Charge instruction means for instructing the start and stop of charging of the battery by manual operation,
The engine start / stop unit starts the engine when a charge start command is issued by the charge command unit, regardless of the remaining capacity, and starts the engine when a charge stop command is issued by the charge command unit. And a low-speed mode in which the engine is rotated at a low speed during operation after the engine is started and the battery is charged.

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