JP2001278597A - Charging device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start an engine of a vehicle even if a battery of a working device is consumed. SOLUTION: This charging device 100 is formed by interposing a charging circuit between a battery circuit A provided in a vehicle chassis capable of traveling with the power of an engine 30 and a battery circuit B provided in a working device arranged on a car body so as to drive the working device 40. This device is formed of a power generation detecting unit 71 for detecting the operating condition of a generator 31 for generating the power with the driving force by the engine, a controller 70 connected so as to supply the power from the generator to an installed battery 45 when the operation of the generator is detected by the power generation detecting unit 71, and a relay switch 75. A line 53 and a line 63 are connected to each other when the operation of the generator 31 is detected by the power generation detecting unit 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a vehicle body configured to be able to travel by using the driving force of an engine, and a work device disposed on the vehicle body for performing a predetermined operation using electric power. The present invention relates to a charging device for a working vehicle.

[0002]

2. Description of the Related Art Such a working vehicle is, for example, an aerial work vehicle. The aerial work vehicle swings on a vehicle body such as a truck that is configured to be able to run by the driving force of the engine,
It has a boom that can freely move up and down, expand and contract, and the like, and a work table on which an operator rides is attached to the tip of the boom. Aerial work vehicles are used, for example, for electrical installation work and construction work such as maintenance and replacement work of electric wires and transformers on telephone poles, and workers on the workbench turn the boom, raise and lower operation, extend and retract operation, etc. Then, the work table is moved to a desired high place, and wiring work and construction work at a high place are performed.

A working vehicle having a working device on a vehicle body as described above generally uses a chassis such as a cab-over type truck as a base vehicle, and a working device and an operation source for operating the working device are provided on the body chassis. There are many things that can be done. For example, in the aerial work vehicle as described above, a boom device that is operated by a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder on a vehicle body, and a power unit (both hydraulic units) that generates and controls a hydraulic pressure as an operation source for operating these units. ) Is provided. The power unit includes an engine type power unit using an engine as a drive source for driving the hydraulic pump, and a battery type power unit using an electric motor. Since the battery type power unit uses an electric motor as the pump drive source,
It is more silent than the engine type power unit,
In recent years, it is often used for power distribution work in urban areas.

[0004] In a working vehicle that uses a battery as a power source for operating a working device, such as an aerial work vehicle equipped with a battery-type power unit, a large current capacity is required to operate the working device for a long time. In addition to a chassis battery mounted on a truck chassis and used for operation and running control of an engine, a vehicle body battery is provided for powering a working device. After the work is performed using the working device, the vehicle is driven to generate electric power by a generator provided in the vehicle engine, so that the chassis battery and the body part battery can be charged together.

[0005]

However, even if a body part battery is provided in addition to the chassis battery for traveling control and the battery capacity of the entire work vehicle is increased, the work device is operated. In this case, the battery is consumed according to the usage amount. For this reason, for example, in a vehicle in which the chassis battery and the body part battery are always directly connected, two batteries are consumed in parallel during the work, and when the vehicle is driven after the work, In some cases, the engine could not be started due to insufficient battery capacity. In order to prevent such a situation, work vehicles equipped with a display device and an alarm device that display the state of battery exhaustion on a meter or LED are also used. If the user does not notice the display, there is a problem that the same situation may occur.

In order to prevent the engine from being unable to start, there is a work vehicle in which only a body part battery is used as a power source of a work device and a chassis battery is not consumed during work. This means that the chassis battery and the body part battery are used separately and independently for their respective purposes. In principle, only the body part battery is used as the power source of the working device, and the power for vehicle travel is used. Use only the chassis battery as a source. However, since it is necessary to charge when the body part battery is exhausted,
A charging circuit for connecting the two batteries is provided between the two batteries, and a switch for disconnecting the charging circuit is provided.

In such a vehicle, when the operator performs an operation at a high place, the operation switch of the operation device is switched to the "drive" side, so that the power is supplied from the body part battery to the operation device and the two batteries are operated. The connection circuit between them is opened to separate the two battery circuits. After the work is completed, switch the operation switch to the "stop / charge" side to cut off the power supplied to the work equipment from the bodywork battery, close the connection circuit between the two batteries, and drive the vehicle. Sometimes the two batteries are charged together using the power generated by the generator.

[0008] However, even in a work vehicle capable of separating two batteries as described above, when the body part battery is excessively consumed, for example, the work device is used for a long time, and the work device has an operation limit. If the body part battery is exhausted to the extent that
If the battery is completely discharged after leaving it for a long time without switching to the side, switch the operation switch to the `` Stop / Charge '' side and switch to the chassis when the two batteries are connected. There has been a problem that the current capacity of the battery is consumed, the voltage is greatly reduced, and the engine may not be able to be started.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and problems, and charges a battery for supplying power to a working device without falling into a state where a vehicle engine cannot be started. It is an object of the present invention to provide a charging device for a working vehicle that can perform the charging.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a vehicle body configured to be able to run using the driving force of an engine, and a predetermined work provided on the vehicle body and using electric power. And a working device for performing the above. In addition, the device includes a first battery (for example, the chassis battery 35 in the embodiment) for supplying power to the engine, and a second battery (for example, the body battery 45 in the embodiment) for supplying power to the working device.
A generator that generates power using the driving force of the engine and charges the first battery, power generation detection means that detects that the generator is operating, and that the operation of the generator is detected by the power generation detection means. And a connection means (for example, the controller 70, the relay switch 75, and the like in the embodiment) that connects the power generated by the generator to the second battery so that the power can be supplied to the second battery.

Here, the term "power generation detecting means" as used herein means a detecting means capable of detecting that the generator is operating. In addition to the detector that detects the electrical power, the electrical detector that detects the power generation state of the generator from the current and voltage, etc., the generator is directly connected to the engine by gears or belts and the engine is rotating. Sometimes, when the generator is rotating at the same time and generating electricity (when the rotation of the engine and the operation of the generator are understood to be substantially synonymous), it is electrically determined that the engine is rotating. , Detecting means including a detector for indirectly detecting a power generation state by mechanically and optically detecting the power generation state.

According to the configuration of the present invention, the second battery for supplying power to the working device is used when the generator for supplying power to the first battery is operating by the power generation detecting means. , So that power can be supplied from the generator. Here, since the generator in the present invention is a generator that operates using the driving force of the engine, when the operation of the generator is detected, it means that the engine is always rotating. That is, the second battery is always connected to the electric circuit of the first battery after the engine has been started, and the engine cannot be started. Further, by detecting the power generation state, it is possible to obtain a charging device capable of preventing the taking out of power from the first battery and charging. Therefore, it is possible to provide a charging device for a working vehicle that can charge the power supply battery of the working device without falling into a state where the engine of the vehicle cannot be started.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an aerial work vehicle as an example of a work vehicle having the charging device according to the present invention. The aerial work vehicle 1 is provided with a swivel base 3 that is horizontally rotatable with respect to the vehicle body 2 by the operation of a swing motor (not shown) on a vehicle body 2 of a vehicle that can travel with a driving cabin 2a. A boom 4 that is moved up and down by an up / down cylinder 12 is pivotally mounted on the base 3. The boom 4 includes a telescopic boom 4a, a middle boom 4b, and a distal boom 4c, which are telescopically moved by a telescopic cylinder 13 built in the boom 4.

A vertical post 6 which is always vertically held by a leveling cylinder (not shown) is pivotally connected to the distal end of the distal end boom 4c, and a work table 8 is attached to the vertical post 6 via a swing arm 7. I have. The worktable 8 is configured to be horizontally swingable (freely swingable) around the vertical post 6 by the operation of a swing motor (not shown) built in the vertical post 6. A winch device 9 is provided at the upper end of the vertical post 6, and can lift a heavy object. Outrigger jacks 18 are provided on the front, rear, left and right sides of the vehicle body 2, and when working at a high place, the vehicle body 2 is lifted up and stably supported by extending the outrigger jack 18 downward and grounding.

The work table 8 is provided with an upper operation device 20. Under a predetermined condition, a command signal corresponding to an operation command of an operator boarding the work table 8 is provided on a power unit 40 provided on the vehicle body. Output to The power unit 40 is a battery-driven hydraulic unit that generates hydraulic pressure using a battery-driven electric hydraulic pump,
Based on the operation signal from the operation device 20, the generated hydraulic pressure is used to turn the motor, the up / down cylinder 12, the telescopic cylinder 13,
It is supplied to each hydraulic actuator such as a swing motor.

Therefore, the operator who gets on the work table 8 can operate the operation device 20, such as the swivel operation of the swivel table 3, the up and down movement of the boom 4, and the expansion and contraction operation. The work table 8 can be moved to an arbitrary high place to perform a desired high place work. A lower operation device 21 is provided at a rear portion of the vehicle body 2, and a worker on the ground can operate the lower operation device 21 to perform a similar operation. A jack operating device 22 is provided at a rear portion of the vehicle body 2 so that the outrigger jack 18 can be extended and a grounding operation can be performed.

The vehicle body 2 has a chassis battery 35 mounted on the chassis of the vehicle body and used for controlling the running of the vehicle, such as a vehicle engine, for supplying electric power to the vehicle electrical system. Is provided with a body part battery 45 for a working device for supplying power to the power supply and operating them.

Chassis battery 35 and body part battery 4
A charging device 100 is disposed adjacent to the charging device 5, and a configuration of a control device including the charging device 100 will be described with reference to FIG. This device is a control device that disconnects a circuit between a battery circuit on the vehicle chassis side indicated by an arrow A and a battery circuit on a work device side indicated by an arrow B with a two-dot chain line shown in the drawing as a boundary. In FIG. 1, the power circuit is indicated by a solid line, and the control circuit is indicated by a dotted line.

The battery circuit A on the vehicle chassis side connects the engine 30, the chassis battery 35, the generator 31 which is directly connected to the engine 30 and generates electric power by the rotational driving force of the engine 30, and connects the engine 30 and the chassis battery 35. And a line 52 connecting the generator and the battery. The engine 30 receives power supply from the chassis battery 35 via the line 51 and rotates the engine 30 to drive the vehicle. At this time, the electric power generated by the generator 31 by the driving force of the engine 30 is returned to the battery via the line 52, and charges the chassis battery 35.

The generator 31 may be either a DC generator (dynamo) or an AC generator (alternator). The AC generator has better power generation performance when the engine 30 is running at a low speed. Yes and preferred. Generator 3
1, a power generation detector 71 is provided, and when the generator 31 is operating to generate power, a predetermined signal (for example, a signal for closing a contact between two terminals or a voltage signal of a constant voltage) , A voltage signal corresponding to the generated power, or a current signal or an optical signal similar thereto.

The battery circuit B on the working device side includes a power unit 40, a body battery 45, and a power unit 40.
And a line 61 connecting the body part battery 45 and the like. The power unit 40 receives power supply from the body part battery 45 via the line 61, rotates the electric hydraulic pump in the unit to generate hydraulic pressure, and receives an operation signal from the upper operation device 20 or the lower operation device 21. Based on this, the electromagnetic control valve in the unit is controlled to open and close, and the operation control of each hydraulic actuator, that is, the operation control such as the boom turning operation, the up / down operation, and the expansion / contraction operation is performed.

As described above, the battery circuit A on the chassis side and the battery circuit B on the working device have separate and independent power circuits, and the batteries 35 and 45 function as independent power sources for the driving devices.

When the vehicle is stopped and the aerial work is performed and the aerial vehicle is stopped and the aerial work vehicle is stopped and the aerial work vehicle is moved to the target work site, the body part battery 45, which is the power source of the power unit 40, operates the boom device. And the boom cannot be operated when the residual capacity falls below a certain value. For this reason, a battery capacity detector (not shown) is provided in the working device side battery circuit B, and the upper operating device 2
0 and the lower operating device 21 indicate the remaining capacity of the body part battery 45, and the charging device 100 is provided with a charging circuit for charging the body part battery 45. In FIG. 1, a power circuit and a control circuit provided between the battery circuit A on the chassis side and the battery circuit B on the working device correspond to the charging circuit.

The power circuit in the charging circuit includes a line 53 extending from the battery circuit A on the chassis side, a line 63 extending from the battery circuit B for the working device, and a relay switch 75 connecting and disconnecting these two lines.
When the voltage of the chassis battery 35 is different from the voltage of the body battery 45, a pressure regulating circuit for adjusting the voltage is provided on the line 53 or the line 63. The control circuit in the charging circuit includes a controller 70, a power generation detector 71 for detecting the power generation status of the generator 31, a relay switch 75, and lines 72 and 73 connecting these.

The operating state of the generator 31 is input to the controller 70 from the power generation detector 71 via the line 72 as the predetermined signal, and the controller 70 connects the line 73 to the relay switch 75 based on this signal. And outputs a relay control signal through the relay. That is, when it is determined from the input signal that the generator 31 is in the power generation state, a relay control signal for closing the relay contact is output, and the generator 3
When it is determined that the relay switch 1 is not in the power generation state, a relay control signal for opening the relay contact is output (one of the relay control signals according to the contact type (A contact, B contact) of the relay switch 75). , But not the other).

In other words, when the generator 31 is not generating power, that is, when the engine 30 is stopped,
The line 53 and the line 63 are cut off, and the battery circuit A on the chassis side and the battery circuit B on the working device function as independent power circuits. When the engine 30 is started and the generator 31 is generating power, the line 53 and the line 63 are connected for the first time, and the power generated by the generator 31 is supplied to the work device side battery circuit B and The battery 45 is charged or the power unit 40
Is supplied with power.

As described above, when the engine 30 of the vehicle is stopped, since the battery circuit A on the chassis side and the battery circuit B on the working device are separated, the battery 35 on the chassis side is consumed during work at a high place. In addition, when starting the engine 30 of the vehicle, there is no possibility that the current capacity of the battery 35 on the chassis side is sucked by the battery circuit B on the working device side and cannot be started. Furthermore, after the engine 30 of the vehicle is started, the chassis-side battery circuit A and the working device-side battery circuit B are automatically connected, so that the battery is not charged because the charging operation of the body part battery 45 is forgotten. There is no worry about things happening. Therefore, it is possible to provide a charging device that can charge the body part battery 45 without falling into a state where the engine 30 of the vehicle cannot be started.

In the above embodiment, an example has been described in which the electric power is converted into hydraulic pressure by the power unit 40 driven by the battery and the swivel 3 and the boom 4 are operated using the hydraulic actuator. Alternatively, a working device such as a boom may be directly operated using an electric actuator such as an electric motor. When the controller 70 determines from the detection signal of the battery capacity detector (not shown) provided in the work device side battery circuit B that the body part battery 45 is fully charged, the controller 70 sets the relay switch 75 May be configured to output a relay control signal for setting the relay contact to “open”. Further, in addition to the relay switch 75, an operation switch similar to that described in the related art may be provided on the line 63.

[0029]

As described above, the present invention relates to a work system having a work device for performing a predetermined work using electric power on a vehicle body which is configured to be able to run using the driving force of an engine. In the vehicle, a first battery that supplies power to the engine, a second battery that supplies power to the working device, a generator that generates power using the driving force of the engine and charges the first battery, and the generator operates. Power generation detecting means for detecting that the operation of the generator has been performed. When the operation of the generator is detected by the power generation detecting means,
Connection means for connecting the battery so that it can be supplied to the battery.

According to such a configuration, the second battery that supplies power to the working device is switched from the generator when it is detected that the generator that supplies power to the first battery is operating. Are connected so as to be able to receive power supply. Since the generator operates using the driving force of the engine, when the operation of the generator is detected, it means that the engine is always rotating, and the second battery is connected to the charging circuit of the first battery. It is always after the engine is started. Further, by detecting the power generation state, a charging device that can prevent the power from being taken out of the first battery and charge the battery can be obtained. Therefore, without falling into a state where the engine of the vehicle cannot be started,
A charging device for a working vehicle that can charge a power supply battery of the working device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a charging device for a work vehicle according to the present invention.

FIG. 2 is a perspective view of an aerial work vehicle having the charging device.

[Explanation of symbols]

 Reference Signs List 1 aerial work vehicle (working vehicle) 2 body 30 engine 31 generator 35 chassis battery (first battery) 40 power unit (working device) 45 body part battery (second battery) 70 controller (connection means) 71 power generation detection Device (power generation detection means) 75 relay switch (connection means) 100 charging device

Claims (1)

[Claims] 1. A work vehicle comprising: a vehicle body configured to be able to travel by using the driving force of an engine; and a work device disposed on the vehicle body and performing a predetermined work using electric power. A charging device, comprising: a first battery that supplies power to the engine; a second battery that supplies power to the working device; and a generator that generates power using the driving force of the engine and charges the first battery. Power generation detecting means for detecting that the generator is operating, and when the operation of the generator is detected by the power generation detecting means, the power generated by the generator is transferred to the second battery. A charging device for a working vehicle, comprising: connecting means for connecting the power supply to the vehicle.