JP2023173432A - work vehicle - Google Patents

Abstract

To provide a work vehicle that is able to change the capacity of a mounted battery according to a battery capacity required by a user.SOLUTION: A work vehicle includes: a vehicle body capable of traveling; a work device provided on the vehicle body; a pump drive motor 53 that operates the work device; a fixedly installed battery 70, which is fixedly installed on the vehicle body; a portable battery 80, which is installed so as to be freely detached from the vehicle body; and a power supply device 100 that supplies power from the fixedly installed battery 70 and the portable battery 80 to the pump drive motor 53. The power supply device 100 can supply power to the pump drive motor 53 by connecting the fixedly installed battery 70 and the portable battery 80 in parallel.SELECTED DRAWING: Figure 3

Description

There is an application for exception to loss of novelty.

The present invention relates to a working vehicle equipped with a battery that supplies power for operating working devices installed on a vehicle body.

Conventionally, work equipment has been used for a variety of tasks, such as equipment for loading and unloading cargo to be transported from a loading platform installed in the chassis of a vehicle, and elevating equipment for lifting and lowering workers and equipment for work at heights. There are work vehicles equipped with The above-mentioned working equipment is generally known to be operated by a hydraulic actuator, but the hydraulic pressure for operating this type of working equipment is supplied from the engine mounted on the working vehicle to a PTO mechanism (power take-off mechanism). ) is generated by driving a hydraulic pump using the driving force taken out through the pump.

In addition, when it is necessary to suppress engine noise and exhaust gas generation at work sites such as residential areas, electric motors rotated by batteries can be used as the drive source for hydraulic pumps that generate hydraulic pressure to operate work equipment. Some are equipped with a motor (for example, see Patent Document 1). In the work vehicle described in Patent Document 1, a charger is always provided to improve work efficiency, and a power supply unit consisting of a motor control device and a charger is disposed on an outrigger box, so that the work device can be The power supply unit is compactly arranged without interfering with the storage space or loading space of the vehicle.

Japanese Patent Application Publication No. 2003-221194

As mentioned above, for work vehicles that use batteries as a power source to generate hydraulic pressure, the required battery capacity varies depending on the user and the work content. In order to avoid a situation where the operation of the work equipment stops, it is often equipped with a large capacity battery. However, large-capacity batteries are generally large in size and weight, and are expensive, so for users who do not require a large capacity, the loading space of work vehicles due to larger batteries may be too large for users who do not require a large capacity. There is a risk that this may lead to dissatisfaction that the battery replacement cost and work load are not commensurate with the reduction in battery replacement.

The present invention has been made in view of such problems, and an object of the present invention is to provide a work vehicle that can change the capacity of the installed battery according to the battery capacity required by the user.

In order to solve the above problems, a work vehicle according to the present invention includes a travelable vehicle body, a work device provided on the vehicle body (for example, the swivel platform 20, the boom 30, the work platform 40, etc. in the embodiment), an electric device (e.g., pump drive motor 53) that operates the working device; a fixed battery that is fixedly installed on the vehicle body; a portable battery that is removably installed on the vehicle body; a power supply device that supplies power from a portable battery to the electric device; the power supply device connects the fixed battery and the portable battery in parallel (for example, S of switch 107
W1→ON, SW2→ON, SW3→OFF) Electric power can be supplied to the electric device.

In the work vehicle configured as described above, the power supply device is capable of supplying only power from the fixedly installed battery to the electric device (for example, SW1 of the power supply switch 107 → ON, SW2 → OFF, SW3 → OFF). ), when the remaining amount of the fixedly installed battery becomes less than a predetermined value, the power supplied to the electric device can be switched from the fixedly installed battery to the portable battery (for example, SW1 of the power supply switch 107 → OFF). , SW2→ON, SW3→OFF).

In the work vehicle configured as described above, the power supply device supplies power from the fixed battery to the electric device, and enables power from the portable battery to be supplied to an electric drive device different from the electric device (for example, , SW1 of the power supply switch 107→ON, SW2→OFF, SW3→ON).

In the work vehicle configured as described above, when the difference between the voltage value of the fixedly installed battery and the voltage value of the portable battery exceeds a predetermined tolerance value, the power supply device is configured to supply power to the fixedly installed battery with respect to the electrically powered device. It is configured so that only power can be supplied from either the battery or the portable battery (for example, SW1 → ON, SW2 → OFF, SW1 → OFF, SW2 → ON of the power supply switch 107). is preferred.

In the work vehicle configured as described above, when the power supply device is supplying only the power of the fixedly installed battery to the electric device and the remaining amount of the fixedly installed battery becomes less than a predetermined value, an alarm is issued. It is preferable to include an activated alarm device (for example, controller 60).

In the work vehicle configured as described above, it is preferable that the portable battery is configured by connecting in series a plurality of battery units (for example, battery units 81a, 81b, 81c) that can be individually attached to and detached from the vehicle body.

According to the work vehicle according to the present invention, the work vehicle includes a fixed battery that is fixedly installed on the vehicle body and a portable battery that is detachably installed on the vehicle body, and has an electric device that operates a work device provided on the vehicle body. The power supply device is configured to connect the fixed battery and the portable battery in parallel to supply power to the electric device. With this configuration, the user can change the capacity of the battery that supplies power to the electric device as necessary by attaching and detaching the portable battery to the vehicle body.

In addition, in the work vehicle configured as described above, the power supply device is capable of supplying only electric power from the fixedly installed battery to the electric device, and when the remaining amount of the fixedly installed battery becomes less than a predetermined value, the power supply device stops supplying the electric power to the electric device. Since it is possible to switch from a fixed battery to a portable battery, for example, if the remaining capacity of the fixed battery falls below a predetermined value, the power supplied to the electric device is switched to the portable battery, and the capacity of the fixed battery is increased. It is possible to continue working beyond the working time that is achievable.

Furthermore, in the work vehicle configured as described above, the power supply device supplies power from the fixed battery to the electric device, while supplying power from the portable battery to an electric drive device different from the electric device. Compared to the case where power is supplied to the electric device and the electric drive device only from a fixedly installed battery, power can be continuously supplied for a long time.

In addition, in a work vehicle with the above configuration, if the difference between the voltage value of the fixed battery and the voltage value of the portable battery exceeds a predetermined tolerance before the fixed battery and the portable battery are connected in parallel, Since the power supply device can only supply power from either the fixed battery or the portable battery to the electric device, a large current flows from one of the fixed battery and the portable battery to the other, causing damage to the battery and the conductive battery. Damage to parts etc. can be avoided.

Furthermore, in the work vehicle having the above configuration, the portable battery is constructed by connecting in series a plurality of battery units that can be individually attached and detached from the vehicle body. The two battery units can be removed from the vehicle body and used as a power source for electric equipment that adapts to the voltage of the single battery unit.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the left side of the aerial work vehicle which is one Embodiment of this invention. It is a side view showing the right side of the above-mentioned aerial work vehicle. FIG. 2 is a block diagram showing a configuration related to operation control of the above-mentioned aerial work vehicle. FIG. 2 is a block diagram showing the configurations of a fixed battery, a portable battery, and a power supply device in the above block diagram.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show the side appearance of a vehicle for aerial work 1 according to the present embodiment, FIG. 1 shows the left side of the vehicle for aerial work 1 when facing the front, and FIG. 2 shows the side surface of the vehicle for aerial work 1. 1 shows the right side facing the front. Note that in FIG. 2, the same components as in FIG. 1 are denoted by the same reference numerals, and detailed explanation thereof will be omitted. Hereinafter, the overall configuration of the aerial work vehicle 1 will be described with reference to these figures.

As shown in FIGS. 1 and 2, the aerial work vehicle 1 is a truck that has a driving cab 7 at the front of a vehicle body 2 and can run on a pair of left and right tire wheels 5 disposed at the front and rear of the vehicle body 2. It is constructed based on a vehicle. The tire wheel 5 includes a front wheel 5F consisting of a left front wheel 5Fl and a right front wheel 5Fr, and a rear wheel 5R consisting of a left rear wheel 5Rl and a right rear wheel 5Rr. The vehicle body 2 includes a chassis frame on which a left front wheel 5Fl, a right front wheel 5Fr, a left rear wheel 5Rl, and a right rear wheel 5Rr are arranged, and a vehicle body frame consisting of a subframe attached to the chassis frame. ing.

Jack devices 10 for lifting and supporting the vehicle body 2 during high-place work are provided on the front, rear, left and right sides of the vehicle body 2. The jack device 10 includes a pair of left and right front jacks 10F arranged behind the front wheels 5F, and a pair of left and right rear jacks 10R arranged behind the rear wheels 5R. In detail, a left front jack 10Fl is arranged behind the left front wheel 5Fl, a right front jack 10Fr is arranged behind the right front wheel 5Fr, a left rear jack 10Rl is arranged behind the left rear wheel 5Rl, A right rear jack 10Rr is disposed behind the right rear wheel 5Rr. Each of the jacks 10F and 10R lifts and supports the vehicle body 2 by driving the jack cylinder 11 provided therein and extending it downward, thereby stabilizing the entire vehicle.

Further, the left front jack 10Fl, the right front jack 10F, the left rear jack 10Rl, and the right rear jack 10Rr are each provided with an outrigger device (not shown). An outrigger cylinder 12 (see FIG. 3) is provided inside each outrigger device, and by expanding and contracting the outrigger cylinder 12, the corresponding jack device 10 can be moved in the width direction of the vehicle body 2 (from the front to the back of the page in FIG. horizontally (from the back to the front). Specifically, by extending the outrigger cylinder 12, the jack device 10 is moved in a direction that extends outward from the side surface of the vehicle body 2. Further, by contracting the extended outrigger cylinder 12, the jack device 10 protruding outward from the side surface of the vehicle body 2 is moved in a direction to be stored in the vehicle body 2. A lower operating device 27 is provided at the rear end of the vehicle body 2 to operate each jack device 10, an outrigger device, a boom 30, etc., which will be described later.

As shown in FIG. 1, a loading space LS is provided between the left rear wheel 5Rl and the left rear jack 10Rl on the lower side of the left subframe of the vehicle body 2. Three portable batteries 80 are installed which can be individually attached and detached from the battery. In the loading space LS, in front of the portable battery 80, two jack bases 13 (placed on the road surface to receive the tip of the extending jack device 10) and two wheel chocks 14 are housed. Further, on the left side of the vehicle body 2, two tool boxes 26 for storing work tools, work equipment, etc. are provided one above the other. The upper tool box 26 has a door on its top surface, and the door opens upward. On the other hand, the lower tool box 26 has a door on the front in FIG. 1, and a hinge is provided on the lower side of the door so that the upper side of the door can be opened so as to fall forward. A power unit 51 housing a hydraulic pump 52 (see FIG. 3) and a pump drive motor 53 (see FIG. 3), which will be described later, is attached to the rear side of the left front jack 10Fl and below the lower tool box 26. .

As shown in FIG. 2, on the right side of the vehicle body 2 and below the subframe, a loading space LS is provided between the right rear wheel 5Rr and the right rear jack 10Rr. A fixed battery 70 is installed, which is fixed to the vehicle body 2 by means of a fixture Fx. In this loading space LS, two jack bases 13 and one wheel stopper 14 are housed in front of the fixedly installed battery 70. Furthermore, between the loading space LS where the fixedly installed battery 70 is installed and the right rear jack 10Rr, there is a normal charging outlet 15 for connecting to an external AC 100V to 200V power supply and a connection to an external quick charger. A quick charging outlet 16 is provided for charging.

A muffler 17 through which exhaust gas from the engine of the aerial work vehicle 1 is discharged is provided in front of the right rear wheel 5Rr. In addition, on the upper side of the subframe of the vehicle body 2, from behind the right front jack 10Fr to the position of the right rear wheel 5Rr, there is a cargo space where construction tools such as safety cones and cone bars used at the work site can be loaded. A side flap plate 18 is attached to the side surface of this cargo space so as to be openable and closable.

As shown in FIG. 1, a swivel base 20 is provided on the subframe in the mounting area behind the driver's cab 7 of the vehicle body 2 and is configured to be driven by a swivel motor 24 to horizontally swivel freely around a vertical axis. It is being A base end portion of a boom 30 is attached to a support 21 extending upward from the swivel base 20 via a foot pin 22 so as to be swingable (up and down) in the vertical direction. The boom 30 has a configuration in which a base end boom 30a, an intermediate boom 30b, and a distal end boom 30c are combined in order from the swivel base 20 side in a nested manner. , the boom 30 can be expanded and contracted in the axial direction (longitudinal direction). Furthermore, a hoisting cylinder 23 is installed astride between the base end boom 30a and the strut 21, and by driving the hoisting cylinder 23 to expand and contract, the entire boom 30 is actuated in the up and down plane (vertical plane). be able to.

A vertical post (not shown) is pivotally supported at the tip of the tip boom 30c so as to be swingable in the vertical direction. This vertical post is constructed by an upper leveling cylinder (not shown) installed across the tip of the tip end boom 30c, and a lower leveling cylinder 25 installed over the base end boom 30a and the support column 21. , rocking control (leveling control) is performed so that the boom 30 is always maintained in a vertical position regardless of how it rises and falls. A workbench 40 for a worker to board is attached to this vertical post via a workbench bracket (not shown). A swinging motor 34 (see FIG. 3) is provided inside this workbench bracket, and by driving this swinging motor 34, the entire workbench 40 is swung around the vertical post (horizontal rotation). operation). Here, since the vertical post is always maintained in a vertical position as described above, as a result, the floor surface of the workbench 40 is always maintained horizontally regardless of the up-and-down angle of the boom 30.

The workbench 40 is provided with an upper operation device 45 that includes various operation means such as an operation lever, an operation switch, and an operation dial that are operated by a worker on the workbench. Therefore, by operating the upper operating device 45, a worker on the workbench 40 can rotate the swivel base 20 (rotation operation of the rotation motor 24), and raise and lower the boom 30 (telescoping operation of the lowering cylinder 23). ), the telescopic operation of the boom 30 (the telescopic operation of the telescopic cylinder 31), the swinging action of the workbench 40 (the rotational action of the swinging motor 34), and the like.

<About the arrangement of the fixed battery 70 and the portable battery 80>
As described above, the fixedly installed battery 70 and the portable battery 80 are each installed between the rear wheel 5R and the rear jack 10R. Therefore, even if the vehicle body 2 is collided with another vehicle from the front, rear, or side, the fixed battery 70 and the portable battery 80 are protected by the rear wheels 5R and the rear jack 10R. , these batteries can be made less likely to be damaged. In particular, by arranging the fixed battery 70 and the portable battery 80 below the subframe, each battery will be surrounded from three sides by the rear wheel 5R, rear jack 10R, and subframe. The protection of each battery by the member can be further strengthened.

In addition, by installing the fixed battery 70 and the portable battery 80 at a lower position than the subframe of the vehicle body 2, the center of gravity of the aerial work vehicle 1 can be lowered, so that the This can prevent a decrease in stability over time. Further, when the operator attaches and detaches the portable battery 80 to the vehicle body 2, the operator can do the attaching and detaching work while standing on the ground. That is, there is no need to move up and down between the subframe of the vehicle body 2 and the ground while carrying a heavy battery even though it is a portable type, and therefore risks associated with attachment and detachment work can be reduced.

In addition, as described above, the door of the lower tool box 26 is designed to open so that the upper side of the door falls forward, so when the aerial work vehicle 1 is parked along the road and the work is performed, the lower door of the tool box 26 opens. There is a high possibility that a space for opening and closing the door of the tool box 26 is secured. Therefore, by removably installing the portable battery 80 on the side where the door of the lower tool box 26 opens and closes (that is, on the left side of the vehicle body 2), the space for attaching and detaching the portable battery 80 is naturally created. More likely to be secured.

In addition, by installing the portable battery 80 on the side of the vehicle body opposite to the oncoming vehicle side when the aerial vehicle 1 travels on the road, that is, on the left side of the vehicle body 2, the aerial vehicle 1 can be moved along the road. When the portable battery 80 is attached or detached while the vehicle is parked in the parking lot, safety can be ensured because the risk of contact with an oncoming vehicle or a vehicle passing by the parked vehicle is reduced. This is true not only for work vehicles such as the aerial work vehicle 1, but also for work vehicles that park along the road and perform work (e.g., buses, trucks, garbage trucks, etc.). .

For example, when using the aerial work vehicle 1 to perform work on utility pole equipment buried along a road, the jack device 10 is extended to the left side of the vehicle body 2 (i.e., the opposite side of the oncoming lane) using an outrigger device, It is assumed that a worker carries out work by bringing the workbench 40 on which he/she is riding close to a utility pole. At this time, if the portable battery 80 is removed from the vehicle body 2, the left side of the vehicle body 2 will become lighter and the stability will be lowered, but the weight of the vehicle body 2 during work will be lower than the right side (stable side) of the vehicle body 2. It is desirable to install the portable battery 80 on the left side because the stability of the battery is less likely to decrease.

Note that the above applies when traffic regulations stipulate that vehicles must drive on the left side of the road, but if vehicles are stipulated to drive on the right side of the road, the vehicle body It is desirable to install the portable battery 80 on the right side of the vehicle body 2 and to install the fixed battery 70 on the left side of the vehicle body 2.

Next, referring to FIG. 3, based on the operation signal output by operating the above-mentioned upper operating device 45 or lower operating device 27, the above-mentioned jack cylinder 11, outrigger cylinder 12, swing motor 24, luffing cylinder 23, A configuration for controlling the operation of each hydraulic actuator including the telescopic cylinder 31, the swing motor 34, etc. will be described.

As shown in FIG. 3, the aerial work vehicle 1 receives operation signals from a hydraulic unit 50 that supplies hydraulic oil to operate each of the above-mentioned hydraulic actuators, an upper operating device 45, and a lower operating device 27. , and a controller 60 that controls the operation of each hydraulic actuator. The hydraulic unit 50 includes a hydraulic pump 52 and a pump drive motor 53 housed in the power unit 51 shown in FIG. 1, and a control valve that controls the supply direction and amount of hydraulic oil supplied from the hydraulic pump 52 to each hydraulic actuator. 54.

The pump drive motor 53 is rotationally driven by electric power supplied from a power supply device 100 (described later), thereby operating the hydraulic pump 52 and discharging hydraulic oil to the control valve 54. The control valves 54 include an electromagnetic proportional control valve V1 corresponding to the jack cylinder 11, an electromagnetic proportional control valve V2 corresponding to the outrigger cylinder 12, an electromagnetic proportional control valve V3 corresponding to the swing motor 24, and an electromagnetic proportional control valve corresponding to the luffing cylinder 23. It has a valve V4, an electromagnetic proportional control valve V5 corresponding to the telescopic cylinder 31, and an electromagnetic proportional control valve V6 corresponding to the swing motor 34.

When an operation signal output by operating the upper operation device 45 or the lower operation device 27 is input to the controller 60, the controller 60 outputs a command signal according to the operation signal to the control valve 54. The control valve 54 electromagnetically drives the spools of the electromagnetic proportional control valves V1 to V6 based on a command signal from the controller 60, and the supply direction and amount of hydraulic oil supplied from the hydraulic pump 52 to each hydraulic actuator. and control the operating direction and operating speed of each hydraulic actuator. As a result, the upper operating device 45 or the lower operating device 27 can extend and retract the jack device 10 and the outrigger device, rotate the swivel platform 20, raise and lower the boom 30, extend and retract the boom 30, and operate the neck of the workbench 40. Operations such as swinging can be performed.

Further, the controller 60 monitors the power supply device 100, and if any abnormality is detected in the power supply device 100, an alarm is activated. Examples of this alarm operation include issuing an alarm using a warning lamp or alarm buzzer, or restricting the operation of work equipment (e.g., jacking device 10, swivel platform 20, boom 30, work platform 40, outrigger device, etc.). This includes the operation of

The power supply device 100 is connected to the fixed battery 70, the portable battery 80, the normal charging outlet 15, and the quick charging outlet 16 shown in FIG. The supplied electric power is supplied to an electric device provided in the vehicle body 2, such as the pump drive motor 53. Further, power supplied from the normal charging outlet 15 and the quick charging outlet 16 is supplied to the vehicle battery 61 via the fixed battery 70, the portable battery 80, and the DC-DC converter 104. The power supply device 100 outputs a DC voltage to a DC-AC inverter 63, and the DC-AC inverter 63 converts the DC voltage supplied from the power supply device 100 into AC100V and is installed in the vehicle body 2. Output from the service outlet 19.

Next, with reference to FIG. 4, the configurations of fixedly installed battery 70, portable battery 80, and power supply device 100 will be described. First, the fixedly installed battery 70 is configured by connecting lithium ion batteries 71a and 71b in parallel. Each of the lithium ion batteries 71a and 71b is constructed by connecting three lithium ion battery modules (hereinafter referred to as "battery modules") in series with an output voltage of V volts. As a result, the voltage of lithium ion batteries 71a and 71b becomes three times (V×3) the output voltage V volts of the battery module. This voltage value is the voltage value of a power source used in an electric device provided in the vehicle body 2, such as the pump drive motor 53.

The terminal voltages, input/output currents, and temperatures of lithium ion batteries 71a and 71b are monitored by CMUs (Cell Management Units) 72a and 72b, respectively. The temperature value is output to the battery management unit 73. The battery management unit 73 turns off the contactor 74 when the values of the terminal voltage, input/output current, and temperature of the lithium ion batteries 71a and 71b outputted from the CMUs 72a and 72b exceed (or fall below) allowable values, and the lithium ion batteries The power supply by 71a and 71b is cut off.

The portable battery 80 includes battery units 81a, 81b, and 81c. Each battery unit is composed of one battery module (the aforementioned lithium ion battery module with an output voltage of V volts) and a CMU. This CMU has the same function as the CMUs 72a and 72b of the fixedly installed battery 70, and outputs the terminal voltage, input/output current, and temperature values of the battery module to the power supply device 100. Note that the battery unit 81a is composed of a battery module 82a and a CMU 83a, the battery unit 81b is composed of a battery module 82b and a CMU 83b, and the battery unit 81c is composed of a battery module 82c and a CMU 83c.

Each battery unit houses a battery module and a CMU in a case, and by fitting the connector attached to the case to the connector installed in the loading space LS shown in Fig. 1, the battery module and CMU are housed inside the case. It becomes possible to electrically connect the battery module and the CMU to the power supply device 100. When the battery units 81a, 81b, 81c are electrically connected to the power supply device 100, these three battery units 81a, 81b, 81c are connected in series within the power supply device 100. As a result, the voltage when the battery units 81a, 81b, and 81c are connected in series becomes the same voltage (V×3) as that of the lithium ion batteries 71a and 71b of the fixedly installed battery 70.

In this way, the individual voltage values of the battery units 81a, 81b, and 81c are set lower than the voltage value of the power source used in the electric device provided in the vehicle body 2, and a plurality of battery units are connected in series. By configuring the battery units 81a, 81b, and 81c to have the voltage value used in the electric device, the battery units 81a, 81b, and 81c can be used for other work vehicles installed with electric devices that use different voltage values. This has the advantage of being possible. For example, if an electric device installed in a certain work vehicle operates at a voltage value of (V x 2), two battery units out of battery units 81a, 81b, and 81c are used to install the electric device in that work vehicle. It is possible to operate the electric equipment that is installed.

The terminal voltage, input/output current, and temperature values of the battery modules monitored by the CMUs 83a, 83b, and 83c of the battery units 81a, 81b, and 81c, respectively, are output to the battery management unit 108 of the power supply device 100. The battery management unit 108 turns off the contactor 109 when the values of the terminal voltage, input/output current, and temperature of each battery module outputted from the CMUs 83a, 83b, and 83c exceed (or fall below) allowable values, and the battery management unit 108 turns off the contactor 109, and controls the battery units 81a, 83c. The power supply from 81b and 81c is cut off.

The power supplied from the fixedly installed battery 70 and the portable battery 80 is output to the power supply switch 107 of the power supply device 100. The power supply switch 107 switches the supply form of the power supplied from the fixed battery 70 and the portable battery 80 according to three types of power supply modes: parallel connection mode, battery switching mode, and external supply mode. The relationship between the above-mentioned power supply mode and power supply form will be explained in detail later. The output destination of the power from the power supply switch 107 is the terminal 103 and the DC-AC inverter 63, and the power output from the power supply switch 107 to the terminal 103 is output to the DC-DC converter 104 and the contactor 105. The signal is supplied to the AC controller 106 via the AC controller 106.

The DC-DC converter 104 converts the voltage value of the electric power supplied from the terminal 103 into a voltage value of the charging voltage of the vehicle battery 61 in order to charge the vehicle battery 61 installed in the aerial work vehicle 1. It is supplied to the vehicle battery 61. Note that the vehicle battery 61 provides power not only to the electrical components installed in the aerial work vehicle 1 but also to the vehicle controller 62, battery management unit 73, charging voltage control device 102, and battery management unit 108. (Indicated by the white arrow in Figure 4). The AC controller 106 converts the power supplied from the terminal 103 into alternating current power, and controls the rotation speed and torque of the pump drive motor 53 by changing the frequency and voltage of the alternating current power.

AC 100V to 200V power supplied from the normal charging outlet 15 is output to the charger 101 of the power supply device 100. Charger 101 outputs a charging voltage of a voltage value specified by a command value from charging voltage control device 102 to terminal 103 . In this embodiment, the charging voltage control device 102 outputs a command value to the charger 101 such that the charging voltage (V×3) for charging the fixedly installed battery 70 and the portable battery 80 is obtained. The charging voltage supplied from the external quick charger to the quick charging outlet 16 is output to the terminal 103.

Here, the contactor 105 is normally turned on, and the power input to the terminal 103 is supplied to the AC controller 106, but charging voltage is normally supplied from the charging outlet 15 or the quick charging outlet 16. Since the contactor 105 is turned off by the vehicle controller 62 during this period, these charging voltages are not supplied to the AC controller 106.

<About the power supply form according to the power supply mode>
As mentioned above, the power supply switch 107 switches the power supply form in response to three types of power supply modes, and this supply form is switched by turning on/off the single-pole, single-throw switches SW1, SW2, and SW3. This is achieved through control. Here, one terminal of the switch SW1 is connected to the fixedly installed battery 70 (more specifically, the contactor 74), and the other terminal is connected to the terminal 103. Further, one terminal of the switch SW2 is connected to the portable battery 80 (more specifically, the contactor 109), and the other terminal is connected to the terminal 103. Furthermore, one terminal of the switch SW3 is connected to the portable battery 80 (more specifically, the contactor 109), and the other terminal is connected to the DC-AC inverter 63. Note that the switch SW1 can be replaced by the contactor 74, and the switch SW3 can be replaced by the contactor 109, so that the switches SW1 and SW3 can be omitted. The on/off states of the switches SW1, SW2, and SW3 corresponding to each power supply mode will be described below.

(parallel connection mode)
When the parallel connection mode is selected by the user, the power supply switch 107 turns on switches SW1 and SW2 and turns off switch SW3. As a result, power is supplied to the AC controller 106 via the terminal 103 with the fixed battery 70 and the portable battery 80 connected in parallel. Therefore, the battery capacity is the sum of the capacity of the fixedly installed battery 70 and the capacity of the portable battery 80, which provides a power supply form suitable for cases where a larger battery capacity is required.

Note that when this mode is selected, the voltage value of the fixed battery 70 and the voltage value of the portable battery 80 are monitored, and if the difference between the two voltage values exceeds a predetermined tolerance range, the switch is activated. Either SW1 or SW2 may be turned off so that only power from either the fixedly installed battery 70 or the portable battery 80 is supplied to the terminal 103. By performing such control, a large current will flow from one of the fixed battery 70 and the portable battery 80 to the other due to the voltage difference between the two batteries, resulting in damage to each battery and conductive parts. This can reduce the risk of it being lost. Additionally, if the difference between the voltage value of the fixedly installed battery 70 and the voltage value of the portable battery 80 exceeds the allowable range, the power supply device 100 notifies the controller 60 that an abnormality has occurred, and the controller 60 issues an alarm. It is also possible to perform the operation.

(Battery switching mode)
When the battery switching mode is selected by the user, power supply switching device 107 first turns on switch SW1 and turns off switches SW2 and SW3. As a result, initially only the fixedly installed battery 70 supplies power to the AC controller 106 via the terminal 103. During this time, the vehicle controller 62 monitors the remaining battery power of the fixedly installed battery 70 based on communication information from the battery management unit 73 and the battery management unit 108, and when the remaining battery power of the fixedly installed battery 70 falls below a predetermined value, a switch is activated. Turn off SW1 and turn on switch SW2. As a result, the battery that supplies power to the AC controller 106 via the terminal 103 is switched from the fixed battery 70 to the portable battery 80.

When this mode is selected, for example, when the remaining amount of the fixed battery 70 becomes less than a predetermined value, the electric power supplied to the AC controller 106 is switched to the portable battery 80, thereby increasing the capacity of the fixed battery 70. Power can be continuously supplied to the AC controller 106 beyond the working time that can be realized by the AC controller 106. Furthermore, if the remaining capacity of the portable battery 80 falls below a predetermined value, the battery units 81a, 81b, and 81c can be replaced with other charged battery units to continue supplying power. can.

In addition, in this mode, when the remaining battery level of the fixedly installed battery 70 becomes less than a predetermined value, it is possible to manually switch the battery that supplies power from the fixedly installed battery 70 to the portable battery 80. good. In this case, when the remaining battery power of the fixedly installed battery 70 becomes less than or equal to a predetermined value, the power supply device 100 notifies the controller 60 of this fact, and the remaining battery power of the fixedly installed battery 70 becomes less than or equal to the predetermined value. In order to notify the operator of this, an alarm may be activated by the controller 60.

(External supply mode)
When the external supply mode is selected by the user, power supply switch 107 turns on switches SW1 and SW3 and turns off switch SW2. As a result, the fixed battery 70 supplies power to the AC controller 106 via the terminal 103, and the portable battery 80 supplies power to the DC-AC inverter 63. In this mode, the battery that supplies power to the AC controller 106 and the battery that supplies power to the DC-AC inverter 63 are each independent, so they are fixedly installed with respect to the AC controller 106 and the DC-AC inverter 63. Compared to the case where power is supplied only from the battery 70, power can be continuously supplied for a long time.

Note that in the above embodiment, the power supply switch 107 performs on/off control of the switches SW1, SW2, and SW3 according to the power supply mode selected by the user, but the power supply mode is set to the power supply mode desired by the user. The user may manually turn on/off the switches SW1, SW2, and SW3. Furthermore, it is not always necessary to perform switching control according to the three types of power supply modes, and it is also possible to configure the system so that switching control can be performed between two desired power supply modes among these power supply modes. good.

Furthermore, if it is only necessary to realize one of the three types of power supply modes, unnecessary switches can be omitted. For example, if only the parallel connection mode is to be realized, the switches SW1, SW2, and SW3 are removed, and the fixed battery 70 and the portable battery 80 are connected in parallel by wiring, and then connected to the terminal 103. Good too. If it is desired to reduce the battery capacity with this configuration, the portable battery 80 can be removed from the vehicle body 2. Similarly, if only the external supply mode is to be achieved, remove switches SW1, SW2, and SW3, connect the fixedly installed battery 70 to the terminal 103 by wiring, and connect the portable battery 80 to the DC-AC inverter 63. It's okay.

In the above embodiment, the vehicle (work vehicle) according to the present invention is a truck-mounted aerial work vehicle, but the invention is not limited to this, and examples include a garbage truck, a crane truck, The present invention may also be applied to other work vehicles, transportation vehicles such as buses and dump trucks, etc.

1 High-altitude work vehicle 2 Vehicle body 5 Tire wheels 10 Jack device 10R Rear jack 20 Swivel platform 30 Boom 40 Work platform 52 Hydraulic pump 53 Pump drive motor 60 Controller 70 Fixed battery 80 Portable batteries 81a, 81b, 81c Battery unit 100 Electric power Supply device 107 Power supply switch

Claims (6)

A vehicle body that can run, a working device provided on the vehicle body, an electric device that operates the working device, a fixed battery that is fixedly installed on the vehicle body, and a portable type that is detachably installed on the vehicle body. A work vehicle comprising a battery, and a power supply device that supplies power from the fixed battery and the portable battery to the electric device,
The work vehicle is characterized in that the power supply device is capable of supplying power to the electric device by connecting the fixed battery and the portable battery in parallel. The power supply device is capable of supplying only power from the fixedly installed battery to the electric device, and when the remaining amount of the fixedly installed battery becomes less than or equal to a predetermined value, the power supply device supplies power to the electric device from the fixedly installed battery. The work vehicle according to claim 1, wherein the work vehicle can be switched from the portable battery to the portable battery. According to claim 2, the power supply device is capable of supplying power from the fixed battery to the electric device and supplying power from the portable battery to an electric drive device different from the electric device. The work vehicle mentioned. When the difference between the voltage value of the fixedly installed battery and the voltage value of the portable battery exceeds a predetermined tolerance value, the power supply device is configured to supply power to the electric device from the fixedly installed battery or the portable battery. The work vehicle according to claim 1, wherein only one of the electric powers can be supplied. An alarm device may be provided that activates an alarm if the remaining amount of the fixed battery falls below a predetermined value when the power supply device is supplying only the power of the fixed battery to the electric device. The work vehicle according to claim 2, characterized in that: The work vehicle according to any one of claims 1 to 5, wherein the portable battery is constructed by connecting in series a plurality of battery units that are individually removable from the vehicle body.