JP6250290B2 - Charging device for work vehicle - Google Patents

Description

  The present invention relates to a charging device that is mounted on a work vehicle including a traveling battery for a vehicle body and a body part battery for supplying driving power to the work device, and charges the traveling battery and the body part battery.

  In a working vehicle such as an aerial work vehicle, a method for driving a working device provided on the vehicle body is to drive a traveling engine of the aerial work vehicle and attach a PTO mechanism (power take-off) attached to the transmission. There is known a configuration in which a hydraulic pump is driven using engine power extracted by a mechanism to supply hydraulic fluid discharged from the hydraulic pump to the working device to drive the working device. . However, in the method of taking out power by driving the engine, noise is generated by the driving sound of the engine. Therefore, when a bodywork battery is provided in the vehicle body instead of the PTO mechanism and work is performed using the work device, the engine is stopped and power is supplied from the bodywork battery to the electric motor. There is also known one configured to drive a working device by driving a hydraulic pump.

  When driving a work device using such a body part battery, it is necessary to charge the body part battery in advance, and it is attached to the engine in the same manner as a charging method using a commercial power source or a PTO mechanism. There has been known a charging device that obtains electric power from a generator and charges it (see, for example, Patent Document 1). There is also known a charging device that charges a body part battery by supplying electric power from a traveling battery of the hybrid traveling system to the body part battery in a work vehicle including the hybrid traveling system (for example, Patent Document 2). See).

Japanese Patent Publication No. 5-73614 Patent No. 4046721

  In the working vehicle configured as described above, it is important to efficiently use the power of the traveling battery and the body part battery. However, in the conventional charging device for the working vehicle, the work battery is mounted from the traveling battery. Power could only be supplied to the body part battery, and power could not be supplied from the body part battery to the traveling battery. For example, since the amount of charge of the traveling battery decreases when traveling using the power of the traveling battery, it may be necessary to charge the traveling battery efficiently. Therefore, there is a need for a charging device that can efficiently charge both batteries by supplying power between the traveling battery and the body part battery during traveling and during work.

  The present invention has been made in view of such a problem, and efficiently charges both batteries by supplying power to each other between the traveling battery and the body part battery during traveling and during work. An object of the present invention is to provide a charging device for a working vehicle that can perform the above-described operation.

In order to solve the above problems, a charging device for a working vehicle according to the present invention includes an engine, a traveling motor capable of driving and driven regenerative power generation , and a traveling battery, and wheels (for example, The electric power generated by rotating the rear wheels 3b, 3b) in the embodiment, supplying the power of the traveling battery to the traveling motor, assisting the output of the engine by driving the traveling motor, and generating regenerative power by the traveling motor. A traveling vehicle having a hybrid system that charges the traveling battery, a working device provided in the traveling vehicle (for example, the boom 5 and the work table 8 in the embodiment), and the working device provided in the traveling vehicle. Mounted on a work vehicle (for example, an aerial work vehicle 1 in the embodiment) including a body part battery for supplying driving power to the vehicle. Is that the charging device. And based on the operating state of the said hybrid system and the said working device, and the charge condition of the said battery for a driving | running | working and the said body part battery, the 1st electric power feeding which supplies electric power to the said body part battery from the said battery for driving | running | working Mode, a second power supply mode for supplying power from the bodywork battery to the travel battery, and a power supply stop mode in which power is not transferred between the travel battery and the bodywork battery obtain Bei the power supply control device that controls charging by selecting (e.g., charge control device 81 in the embodiment). Further, the power supply control device selects the first power supply mode when the power supply control device is in a state where power is supplied from the bodywork battery to the work device and the work device is operable. The second power feeding mode is selected when the power supply from the battery pack to the working device is interrupted.

In the charging device of the above SL configurations, the power supply control device, the working device in the operable state is the power supplied to the working device from the KaSobu battery, the charge state of the traction battery is in a predetermined 1 when set at the charge amount or more it is preferably configured to select the first power supply mode. Further, the power supply control device in the first power supply mode, when the KaSobu battery has been fully charged, or when the traveling battery becomes less than the first predetermined charge amount, the It is preferable to be configured to switch from the first power supply mode to the power supply stop mode.

In the charging device of the above SL configurations, the power supply control device, the in a state where KaSobu power supply from the battery to the working device is interrupted, power is supplied to the traveling motor from the traction battery wherein travel motor is driven, and, when the state of charge of the KaSobu battery is second set charge amount or more predetermined, it is preferably configured to select the second power supply mode. Further, the power supply control device in the second power supply mode, when the driving battery has been fully charged, or when the KaSobu battery becomes lower than the second set of charge, the It is preferable to be configured to switch from the second power supply mode to the power supply stop mode.

In the charging device of the above SL configurations, the power supply mode switching operation means for switching the power supply mode selected in the power supply control device (e.g., power supply mode selector switch 83 in the embodiment) is possible to obtain Bei preferred.

  According to the working vehicle charging device of the present invention, not only is the power supplied from the traveling battery to the bodywork battery to charge the bodywork battery, but also the power is supplied from the bodywork battery to the battery for traveling. The battery for traveling can be supplied and charged, and the charging control is performed by selecting an appropriate charging method according to the operating state of the hybrid system and the working device, and the charging state of the traveling battery and the body part battery. be able to. Therefore, during traveling and during work, power can be supplied between the traveling battery and the body part battery to charge both batteries efficiently.

  In a state where the bodywork battery and the work device are electrically connected (a state where the work device is operable), when the travel battery is equal to or more than a predetermined set charge amount, the first power supply mode is selected for travel. Power can be supplied from the battery to the body part battery to charge the body part battery, and the work by the work device can be prevented from being interrupted due to insufficient charging of the body part battery. Here, when the traveling battery is less than the set charge amount, the hybrid system performs the control not to transfer power between the traveling battery and the body part battery by selecting the power supply stop mode. When traveling, it is possible to prevent the hybrid system from functioning normally due to insufficient charging of the traveling battery.

  On the other hand, in a state where the electrical connection between the bodywork battery and the work device is interrupted (a state where the power of the bodywork battery is not used), the power of the travel battery is supplied to the travel motor, and the bodywork When the front battery is equal to or higher than a predetermined set charge amount, the second power feeding mode can be selected to supply power from the bodywork battery to the travel battery to charge the travel battery. It is possible to prevent the system from functioning normally due to insufficient charging of the traveling battery. Here, when the body part battery is less than the set charge amount, the power supply stop mode is selected and control is performed so that power is not transferred between the traveling battery and the body part battery. Therefore, it is possible to prevent the work from being performed due to insufficient charging of the body part battery.

  In addition, the power supply mode automatically selected in the power supply control device can be switched by the power supply mode switching operation means to perform power supply control, and the operating state of the hybrid system and the work device, the traveling battery and the body part battery can be controlled. Regardless of the state of charge, the operator can arbitrarily select the charge control.

It is a perspective view which shows the aerial work vehicle where the charging device which concerns on this invention is mounted. It is a block diagram which shows the structure of the drive part which drive | works the said aerial work vehicle, and the structure of the drive part which drives an aerial work apparatus. It is a block diagram which shows the structure of the charging device which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings. An aerial work vehicle 1 is shown in FIG. 1 as an example of a work vehicle on which a charging device according to the present invention is mounted. The aerial work vehicle 1 has a driving cab 2a at the front part of a vehicle body 2 and is based on a truck vehicle (traveling vehicle) that can be driven by a pair of left and right front wheels 3a and rear wheels 3b disposed on the front and rear of the vehicle body 2. It is configured.

  On the vehicle body 2 behind the driving cab 2a, there is provided a swivel 4 that is driven by a swivel motor 51 and configured to be horizontally swivelable. A boom 5 is attached to a support column extending above the swivel base 4 so as to be swingable up and down (can be raised and lowered) by a foot pin. The boom 5 is configured such that a proximal boom 5a, an intermediate boom 5b, and a distal boom 5c, which are attached to the support column of the swivel 4 so as to be raised and lowered, are combined in a telescopic manner, and can be expanded and contracted by a built-in telescopic cylinder 53. Has been. Further, the boom 5 is configured to be able to be raised and lowered by a raising and lowering cylinder 52 straddled between the base end boom 5 a and the swivel base 4.

A vertical post (not shown) is attached to the distal end portion of the distal end boom 5c so as to be swingable within the undulating surface of the boom 5. The vertical post is controlled to swing (leveling) by a leveling cylinder (not shown) straddling between the tip boom 5c and the vertical post so that the vertical post is always vertically extended regardless of the undulation angle of the boom 5. Control). Thus, the worktable support bracket 6 is attached to the vertical post that is always held vertically so as to be able to turn horizontally. The worktable support bracket 6 is configured to be horizontally rotatable with respect to a vertical post by a built-in swing motor (not shown). A work table 8 is attached to the work table support bracket 6 via an arm portion 7. As described above, since the vertical posts are always held vertically, the floor surface of the work table 8 is always held horizontally regardless of the undulation angle of the boom 5. A sub-boom device 18 is provided at the upper end of the worktable support bracket 6 for lifting the working member.

  The work table 8 is provided with a boom operation device 10. The boom operation device 10 is provided with an operation lever for operating the swivel base 4 and the boom 5, various operation switches, and the like. Therefore, in the aerial work vehicle 1, an operator who has boarded the work table 8 operates the boom operation device 10 to turn the swivel table 4, turn the boom 5 up and down, and swing the work table 8. Thus, it is possible to move to a desired high position.

  In the aerial work vehicle 1 configured as described above, when the work table 8 is moved by turning or extending the boom 5 or when a heavy object is lifted by the sub boom device 18, the boom 5 is used as an arm. A moment (generally referred to as a “falling moment”) that tries to fall is applied. Therefore, in order to stably support the vehicle body 2 against this overturning moment, outrigger jacks 9 are provided at four locations on the front, rear, left and right of the vehicle body 2.

  The illustrated outrigger jack 9 is of a so-called H type, and is configured such that a jack provided at a side end of the outrigger inner box can be expanded and contracted to the left and right by a slide cylinder (not shown) built in a horizontal rectangular outrigger box. Has been. The outrigger jack 9 includes a vertically long box-like outer post 9a that extends vertically, an inner post 9b that is telescopically inserted into the outer post 9a and slidable up and down, and a jack cylinder 54 that is built in between these posts. It is configured. The outrigger jack 9 extends the inner cylinder 9b downward from the outer post 9a by extending the jack cylinder 54, and grounds the ground plate 9c provided at the lower end of the inner post 9b to the ground. It is comprised so that 2 can be lifted and supported. A jack ground detector 11 that detects that the outrigger jack 9 is grounded is provided at the upper end of the jack cylinder 54.

  At the rear part of the vehicle body 2, a jack operating device 20 that operates each outrigger jack 9 is provided. Further, the vehicle body 2 includes a controller 30 that controls the operation of the swivel base 4, the boom 5, the work table 8, and the outrigger jack 9, a swivel motor 51, a hoisting cylinder 52, a telescopic cylinder 53, a jack cylinder 54, etc. A hydraulic unit 40 that supplies hydraulic oil to the actuator 50).

  The aerial work vehicle 1 is configured based on a hybrid vehicle that travels while assisting the engine power with a motor. The configuration of the hybrid vehicle will be described with reference to FIG. In FIG. 2, the flow of electric power is indicated by a thick solid line, the flow of electrical signals is indicated by a thin solid line, and the flow of hydraulic oil is indicated by a broken line.

  The aerial work vehicle 1 includes an engine 61, a traveling motor 62 connected to the engine 61, a transmission 63 that shifts the output of the engine 61 and the traveling motor 62 and transmits the output to the rear wheels 3b, 3b, and a traveling battery. 64, and a hybrid system 60 that includes a power drive unit 65 that connects the travel battery 64 and the travel motor 62 to control power transfer between the travel battery 64 and the travel motor 62. Yes. The hybrid system 60 is configured in a parallel hybrid system in which the output shafts of the engine 61 and the travel motor 62 are connected in series, and the rear wheels 3 b and 3 b and the travel motor 62 can be driven by the engine 61.

The traveling motor 62 is constituted by, for example, a three-phase AC synchronous motor, and is rotated by the electric power from the traveling battery 64 when the engine 61 is started to function as an engine starter. The traveling motor 62 is rotated by the electric power from the traveling battery 64 to assist the output (torque) of the engine 61 when the aerial work vehicle 1 is accelerated, and the engine E
In addition, the rear wheels 3b and 3b are configured to rotate. The traveling motor 62 is rotated by the rear wheels 3b and 3b to function as a generator when the aerial work vehicle 1 is decelerated, and converts the deceleration energy of the vehicle into electric energy (electric power) (regenerative power generation). ) The battery for traveling 64 is configured to be charged. The traveling battery 64 is constituted by, for example, a nickel metal hydride or lithium ion battery having a voltage of 346V.

  The power drive unit 65 includes an inverter unit for transferring power between the traveling motor 62 and the traveling battery 64, and an engine control unit that controls the engine 61, the traveling motor 62, and the traveling battery 64. Has been. When the key switch 70 is turned on and the aerial work vehicle 1 is in a starting state, the engine control unit includes a rotation sensor 66 that detects the rotation speed of the engine 61, a vehicle speed sensor 67 that detects the vehicle speed of the aerial work vehicle 1, an accelerator The engine 61, the traveling motor 62, and the traveling battery 64 are controlled based on signals from an accelerator sensor 68 that detects the degree of opening and a clutch switch 69 that detects the state of the clutch.

  The operating mechanism of the aerial work device (such as the boom 5 described above) provided on the vehicle body 2 receives an operation signal from the boom operation device 10 and the jack operation device 20 and a detection signal from the jack grounding detector 11. A controller 30 that controls the actuator 50, a hydraulic unit 40 that supplies hydraulic oil to operate the actuator 50, and a body part battery 31 that drives the aerial work apparatus are configured. The body part battery 31 is composed of, for example, a lead storage battery having a voltage of 48V.

  The hydraulic unit 40 is driven by receiving power from the first pump 42 driven by the power extracted by the power take-off mechanism (PTO mechanism) 71 attached to the transmission 63 and the body part battery 31. And a second pump 44 driven by a pump driving motor 43. The first pump 42 and the second pump 44 are configured such that either one of the switches 32 and 33 is switched by the controller 30 to drive one of them, and the hydraulic oil sucked from the hydraulic oil tank 45 is controlled by the control valve 46. To supply. The operation of the control valve 46 is controlled by the controller 30, and the operation of the actuator 50 is controlled by controlling the supply direction and supply amount of hydraulic oil supplied to the actuator 50. The controller 30 switches the switches 32 and 33 in response to a switching signal from a pump switch (not shown) provided in the boom operating device 10 and the jack operating device 20.

  A charging device for charging the body part battery 31 and the traveling battery 64 in the aerial work vehicle 1 configured as described above will be described with reference to FIG. In FIG. 3, only the components necessary for the description are shown, and the others are omitted. Also in FIG. 3, the flow of electric power is indicated by a thick solid line, and the flow of electrical signals is indicated by a thin solid line.

The charging device 80 is provided on a circuit that connects the body part battery 31 and the traveling battery 64, and includes a charging control device 81 that controls transmission and reception of electric power between the body part battery 31 and the traveling battery 64, and an outlet A first charger 85 that obtains electric power from the commercial power source by 85a and charges the body part battery 31; and a second charger 86 that obtains electric power from the commercial power source by the outlet 86a and charges the running battery 64. Configured. The first charger 85 has a function of detecting the charging state of the body part battery 31 until the body part battery 31 reaches a predetermined charge amount (hereinafter referred to as “full charge Vf ₁ ”). It is configured to charge. The second charger 86 has a function of detecting the state of charge of the traveling battery 64 and charges the traveling battery 64 until a predetermined amount of charge (hereinafter referred to as “full charge Vf ₂ ”) is reached. It is configured as follows.

  The charging control device 81 includes a converter unit (DC-DC converter) 81a for transferring power between the body part battery 31 and the traveling battery 64, and the charging state of the body part battery 31 and the traveling battery 64. And a charging control unit 81b that selects a power supply mode based on the operating states of the hybrid system 60 and the aerial work device (such as the above-described boom 5) and performs charging control of the body part battery 31 and the traveling battery 64; It is comprised.

  Here, the power supply mode includes a first power supply mode M1 in which power is supplied from the traveling battery 64 to the body part battery 31 to charge the body part battery 31, and a battery for traveling from the body part battery 31. A second power feeding mode M2 for performing control to supply power to 64 to charge the traveling battery 64, and a power feeding stop mode for performing control not to transfer power between the body part battery 31 and the traveling battery 64. M3. The charging control unit 81b has a function of detecting the charging state of the body part battery 31 and the traveling battery 64, the charging state of each of the batteries 31, 64, and the operation of the hybrid system 60 and the aerial work device. Based on the state, one of the first power supply mode M1, the second power supply mode M2, and the power supply stop mode M3 is selected, and charging control of the body part battery 31 and the traveling battery 64 is performed. .

When the controller 32 is turned on by the controller 30 and the body part battery 31 and the pump drive motor 43 are electrically connected, the charge control unit 81b supplies power from the body part battery 31 to the pump drive motor 43. When the altitude work device is enabled to operate, the charging state of the traveling battery 64 is detected, and the traveling battery 64 has a predetermined charge amount (hereinafter referred to as “lower limit set charge amount Vb _2”). In the case of the above, the first power supply mode M1
Select. When the first power supply mode M1 is selected, the power of the traveling battery 64 is stepped down to a voltage that can be charged to the body part battery 31 by the converter unit 81a (for example, the voltage 346V of the traveling battery 64 is changed to the body part battery). The voltage is converted to a voltage 48 V of 31 and supplied to the body part battery 31, and the body part battery 31 is charged. When the body part battery 31 reaches the full charge Vf ₁ or when the traveling battery 64 becomes less than the lower limit set charge amount Vb ₂ , the first power supply mode M1 is switched to the power supply stop mode M3. Control is performed so that power is not transferred between the battery pack 31 and the running battery 64. On the other hand, when the running battery 64 is less than the lower limit set charge amount Vb ₂ from the beginning, the power supply stop mode M3 is selected and control is performed so that power is not transferred between the body part battery 31 and the running battery 64. Do. At this time, the charge control unit 81b performs control to charge the electric power is generated by the travel motor 62 by driving the engine 61 to the driving battery 64, the driving battery 64 is set lower limit charge amount Vb ₂ or more You may control so that a charge state may be maintained.

On the other hand, when the switch 32 is turned off by the controller 30 and the electrical connection between the body part battery 31 and the pump driving motor 43 is interrupted (when the power of the body part battery 31 is not used to drive the aerial work device) ) Based on a control signal transmitted from the power drive unit 65, it is determined whether or not current is supplied from the traveling battery 64 to the traveling motor 62, and electric power is supplied from the traveling battery 64 to the traveling motor 62. travel motor 62 Te is when being rotated, when KaSobu battery 31 is the lower limit set charge amount Vb ₁ or selects the second power supply mode M2. When the second power supply mode M2 is selected, the power of the body part battery 31 is boosted and converted to a voltage that can be charged to the traveling battery 64 by the converter unit 81a (for example, the voltage 48V of the body part battery 31 is changed to the traveling battery). The voltage is converted into a voltage 346V of 64 and supplied to the traveling battery 64, and the traveling battery 64 is charged. When the traveling battery 64 reaches the full charge Vf ₂ or when the body part battery 31 becomes less than the lower limit set charge amount Vb ₁ , the second power supply mode M2 is switched to the power supply stop mode M3. Control is performed so that power is not transferred between the battery pack 31 and the running battery 64. When the body part battery 31 is less than the lower limit set charge amount Vb ₁ , the power supply stop mode M3 is selected and control is performed so that power is not transferred between the batteries 31 and 64. On the other hand, if the power of the driving battery 64 is not supplied to the traveling motor 62, detects the state of charge of KaSobu battery 31, when KaSobu battery 31 is less than the lower limit set charge amount Vb ₁ first performs control to charge the KaSobu battery 31 to select the power supply mode M1, during both batteries 31, 64 to select the power supply stop mode M3 when KaSobu battery 31 is set lower limit charge amount Vb ₁ or more Control that does not send or receive power.

Further, based on the control signal transmitted from the power drive unit 65, when the aerial work vehicle 1 is decelerated, the traveling motor 62 is rotationally driven by the rear wheels 3b, 3b and the electric power generated by the traveling motor 62 (regenerative power). When the traveling battery 64 is charged to the lower limit charge amount Vb ₂ when the traveling battery 64 is charged with the power generated by the traveling motor 62. Selects the first power supply mode M1. When the first power supply mode M1 is selected, the power of the traveling battery 64 is supplied to the body part battery 31 via the converter part 81a, and the body part battery 31 is charged. Then, when the body part battery 31 reaches the full charge Vf ₂ , the first power supply mode M1 is switched to the power supply stop mode M3, and control is performed so that power is not transferred between the batteries 31 and 64. When the running battery 64 is less than the lower limit set charge amount Vb ₂ , the power supply stop mode M3 is selected and control is performed so that power is not transferred between the batteries 31 and 64.

In addition, the charge control unit 81b is connected to the commercial power source based on the control signal transmitted from the first charger 85, and obtains electric power from the commercial power source so that the body part battery 31 is charged. In the case where the body part battery 31 is charged using the first charger 85 and the body part battery 31 is equal to or higher than the lower limit set charge amount Vb ₁ , the second power feeding mode is determined. Select M2. When the second power feeding mode is selected, the power of the body part battery 31 is supplied to the traveling battery 64 via the converter unit 81a, and the traveling battery 64 is charged. When the traveling battery 64 reaches the full charge Vf ₂ , the power supply is not transferred between the body part battery 31 and the traveling battery 64 by switching from the second power supply mode M2 to the power supply stop mode M3. Take control. When the body part battery 31 reaches the full charge Vf ₁ , the charging of the body part battery 31 by the first charger 85 is stopped. When the body part battery 31 is less than the lower limit set charge amount Vb ₁ , the power supply stop mode M3 is selected and control is performed so that power is not transferred between the batteries 31 and 64.

  The charging device 80 includes a power supply mode changeover switch 83 that switches the power supply mode automatically selected as described above in the charge control unit 81b. The power supply mode changeover switch 83 is an operation unit that can arbitrarily switch any one of the first power supply mode M1, the second power supply mode M2, and the power supply stop mode M3 by an operator. They are provided around the device 10 and in the vehicle body 2. The charging control unit 81b selects the power supply mode based on the charging state of the body part battery 31 and the traveling battery 64 and the operating state of the hybrid system 60 and the aerial work device as described above, and the body part battery. When the charging control is performed by the power supply mode changeover switch 83 while the charging control of the power supply 31 and the traveling battery 64 is being performed, the body part battery 31 and the traveling battery 64 are switched based on the switched power supply mode. Charge control.

For example, even when the switch 32 is turned on by the controller 30 and the body part battery 31 and the pump driving motor 43 are electrically connected, the traveling battery 64 is less than the lower limit set charge amount Vb _2. Then, the first power supply mode M1 is selected by the power supply mode changeover switch 83, the electric power of the traveling battery 64 is supplied to the body part battery 31 via the converter part 81a, and the body part battery 31 is charged. be able to. At this time, the charging control unit 81b may be configured to control the driving battery 64 to charge the electric power generated by the driving motor 62 by driving the engine 61.

  Further, for example, in a state where the switch 32 is turned off by the controller 30 and the electrical connection between the bodywork battery 31 and the pump drive motor 43 is cut off, power is supplied from the travel battery 64 to the travel motor 62 to travel. Even when the motor 62 is rotationally driven, the first power supply mode M1 is selected by the power supply mode changeover switch 83 regardless of the charge amount of the travel battery 64, and the power of the travel battery 64 is converted to the converter unit. It can supply to the body part battery 31 via 81a, and the control which charges the body part battery 31 can be performed.

Further, for example, the charging control unit 81b is connected to the commercial power source based on the control signal transmitted from the second charger 86, and obtains electric power from the commercial power source to charge the traveling battery 64. When the traveling battery 64 is charged using the second charger 86, the first power feeding mode M1 is selected by the power feeding mode changeover switch 83, and the power of the traveling battery 64 is determined. Can be supplied to the body part battery 31 via the converter part 81a, and the body part battery 31 can be charged. At this time, when the body part battery 31 reaches the full charge Vf ₁ , the first power supply mode M1 is switched to the power supply stop mode M3, and power is not exchanged between the body part battery 31 and the traveling battery 64. Take control. When the driving battery 64 is fully charged Vf _2, the charging of the driving battery 64 by the second charger 86 may be configured to be stopped.

  As described above, according to the charging device 80 (charging control device 81), not only the power is supplied from the traveling battery 64 to the body part battery 31 to charge the body part battery 31, but also from the body part battery 31. Electricity can be supplied to the traveling battery 64 to charge the traveling battery 64, the operating state of the hybrid system 60 and the aerial work device (the above-described boom 5, etc.), the traveling battery 64 and the body part Charging control can be performed by selecting an appropriate power supply mode according to the charging state of the battery 31. Therefore, during traveling and during work, power can be supplied between the traveling battery 64 and the body part battery 31 to charge both batteries 64 and 31 efficiently.

When the switch 32 is turned on and the body part battery 31 and the pump drive motor 43 are electrically connected (the high-altitude work device is operable), the charge control device 81 If the lower limit set charge amount Vb ₂ or more, it is possible to charge the KaSobu battery 31 supplies power to the KaSobu battery 31 from the traction battery 64 to select the first power supply mode M1, high It is possible to prevent the work performed by the place work apparatus from being interrupted due to insufficient charging of the body part battery 31. Here, the traveling battery 64 has a lower limit set charge amount Vb _2.
Is less than the power supply stop mode M3, the battery for traveling when traveling by the hybrid system 60 is performed by performing control not to transfer power between the traveling battery 64 and the body part battery 31. It is possible to prevent the hybrid system 60 from functioning normally due to the lack of charging 64.

On the other hand, when the switch 32 is turned off and the electrical connection between the body part battery 31 and the pump drive motor 43 is interrupted (when the power of the body part battery 31 is not used), the power of the traveling battery 64 is reduced. are supplied to the traveling motor 62, and, when KaSobu battery 31 is the lower limit set charge amount Vb ₁ or more, KaSobu battery 3 selects the second power supply mode M2
It is possible to charge the traveling battery 64 by supplying power from 1 to the traveling battery 64, and to prevent the hybrid system 60 from functioning normally due to insufficient charging of the traveling battery 64 during traveling. Here, when the body part battery 31 is less than the lower limit set charge amount Vb ₁ , the power supply stop mode M3 is selected so that power is not transferred between the traveling battery 64 and the body part battery 31. By doing so, it is possible to prevent the work from being performed due to insufficient charging of the body part battery 31 when the work is performed by the high place working device.

In a state where the regenerative electric power generated by the travel motor 62 during deceleration of the aerial 1 is supplied to the driving battery 64, when the driving battery 64 is the lower limit set charge amount Vb ₂ or more, The first power supply mode M1 can be selected to supply electric power from the traveling battery 64 to the body part battery 31 to charge the body part battery 31, and the traveling battery 64 can be decelerated using deceleration energy (regenerative power). And the body part battery 31 can be charged efficiently. Here, when the traveling battery 64 is less than the lower limit set charge amount Vb ₂ , the power supply stop mode M3 is selected and control is performed so that power is not transferred between the traveling battery 64 and the body part battery 31. Accordingly, it is possible to prevent the hybrid system 60 from functioning normally due to insufficient charging of the traveling battery 64 when traveling by the hybrid system 60.

When the first charger 85 is connected to a commercial power source and the body part battery 31 is charged and the body part battery 31 is equal to or higher than the lower limit set charge amount Vb ₁ , the second power supply mode M
2 can be selected to charge the traveling battery 64 by supplying power from the bodywork battery 31 to the traveling battery 64, and both the traveling battery 64 and the body battery 31 can be connected using a commercial power source. It can be charged efficiently. Here, when the state of charge of the body part battery 31 is less than the lower limit set charge amount Vb ₁ , the power supply stop mode M3 is selected and the battery for traveling 6
4 and the body part battery 31 are controlled so that power is not transferred between them, the body part battery 31 can be charged first using a commercial power source, and then the traveling battery 64 can be charged. .

  In addition, the power supply mode automatically selected in the charging control device 81 can be switched by the power supply mode changeover switch 83 to perform power supply control. The operating state of the hybrid system 60 and the work device, the traveling battery 64 and the bodywork can be controlled. Regardless of the state of charge of the battery 31, the operator can arbitrarily select charge control. For example, in a state where the second charger 86 is connected to a commercial power source and the running battery 64 is charged, the first feeding mode M1 is selected by the feeding mode changeover switch 83 and the body part battery is selected from the running battery 64. Power can be supplied to 31 to charge the body part battery 31 with priority. Thus, the operator can arbitrarily select and charge one of the traveling battery 64 and the body part battery 31. Moreover, if comprised in this way, the 1st charger 85 which charges the body part battery 31 using a commercial power supply can also be made unnecessary.

  Although the embodiment according to the present invention has been described so far, the scope of the present invention is not limited to that shown in the above-described embodiment. For example, in the above-described embodiment, as an example of a working vehicle on which the charging device according to the present invention is mounted, the aerial work vehicle 1 including the aerial work device including the boom 5 on the vehicle body 2 is described. The present invention can also be applied to a working vehicle equipped with a vertical mast type or scissor-link type aerial work device or a work device other than the high work device. In the above-described embodiment, the parallel hybrid type aerial work vehicle 1 has been described, but the present invention can also be applied to a series hybrid type or split hybrid type traveling vehicle.

1 Aerial work vehicle (work vehicle)
3b, 3b Rear wheel (wheel)
5 Boom (Working device)
8 Work table (work equipment)
31 Bodywork Battery 60 Hybrid System 61 Engine 62 Traveling Motor 64 Traveling Battery 80 Charging Device 81 Charging Control Device (Power Supply Control Device)
83 Power supply mode switch (Power supply mode switching operation means)
85 1st charger (Battery charger)
86 Second Charger (Battery Battery Charger)

Claims (6)

An engine, a traveling motor capable of driving and driven regenerative power generation , and a traveling battery, rotating a wheel by the output of the engine, supplying electric power of the traveling battery to the traveling motor, A traveling vehicle having a hybrid system that assists the output of the engine by driving and charges the traveling battery with electric power regenerated by the traveling motor, a working device provided in the traveling vehicle, and the traveling vehicle A charging device mounted on a working vehicle comprising a body part battery for providing driving power to the working device,
A first power supply mode for supplying electric power from the traveling battery to the bodywork part battery based on operating states of the hybrid system and the working device, and a charging state of the battery for traveling and the bodywork part battery; Select one of a second power supply mode for supplying power from the bodywork battery to the travel battery and a power supply stop mode in which power is not transferred between the travel battery and the bodywork battery. and includes a power supply control device for supplying power control,
The power supply control device selects the first power supply mode when power is supplied from the bodywork battery to the work device and the work device is operable.
The charging device for a working vehicle , wherein the second power feeding mode is selected when power supply from the bodywork battery to the work device is interrupted . The power supply control device in the KaSobu the working device operable state is the power supplied to the working device from the battery, when the charge state of the traction battery is first set charge amount or more of a predetermined the charging device for a working vehicle according to claim 1, characterized by selecting said first power supply mode. The power supply control device in the first power supply mode, when said KaSobu battery has been fully charged, or when the traveling battery becomes less than the first predetermined charge level, the first charging device for a working vehicle according to claim 2, characterized in that switching from charging mode to the power supply stop mode. The power supply control device, the in a state where KaSobu power supply from the battery to the working device is interrupted, the traction motor from the traction battery power is supplied to the traveling motor is driven, and, when the state of charge of the KaSobu battery is second set charge amount or more predetermined, the work vehicle according to claim 1, characterized by selecting the second power supply mode Charging device. The power supply control device in the second power supply mode, when the driving battery has been fully charged, or when the KaSobu battery becomes lower than the second set of charge, the second charging device for a working vehicle according to claim 4, characterized in that switching from charging mode to the power supply stop mode. Charging device for a working vehicle according to any one of claims 1 to 5, characterized in that Ru provided with a power supply mode switching operation means for switching the power supply mode selected in the power supply control device.

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