JP2008308881A - Work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work vehicle operable by the operator with any of a battery and an external power without feeling a sense of incongruity. <P>SOLUTION: When a key switch is turned on (a key switch signal SD1 is turned on), an auxiliary power supply voltage is supplied from a power supply VS to a controller 13, but a power supply switch 16a, a charging switch 16b are kept in OFF state (driving standby state S11). When the key switch is operated to start in this state, the power supply switch 16a is turned on, and the work vehicle can be driven with a battery 10. Also, when the charging switch is turned on in the driving standby state S11 (a charging switch signal SD4 is turned on), the charging switch 16b is turned on, and the work vehicle is brought into a charging standby state S21 in which the charging of the battery 10 from the external power supply 11 is performed. When the key switch is operated to start in this charging standby state S21, the power supply switch 16a is turned on, the battery 10 is charged continuously, and the work vehicle can be driven with the external power supply 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a work vehicle such as a construction machine or an industrial machine using an electric motor as a main power source, and more particularly to a work vehicle using an in-vehicle battery or an external power source as a drive source of the electric motor.

  Work vehicles used for civil engineering work such as construction machinery and industrial machinery and disposal of industrial waste are required to have exhaust gas regulations and noise / vibration regulations. In a work vehicle, the main factors that cause problems with exhaust gas, noise, and vibration are the use of an engine as a drive source. On the other hand, there is an electric construction machine that does not exhaust exhaust gas at all and greatly reduces noise and vibration. In such an electric construction machine, an electric motor is used as a main drive source. By supplying electric power from a commercial power source or a battery to the electric motor, the actuator is driven by the electric motor to perform construction work. ing.

  Such an electric construction machine is often used at a site where engine exhaust such as underground is not possible, and work is performed by driving an electric motor by an external commercial power source. However, in such an electric work vehicle, a power cable is connected to the external power source during the work, and this hinders the movement and turning of the work vehicle, and restricts the work operation.

  In order to solve such a problem, there has been proposed an electric construction machine equipped with a battery and using this as a power supply source (power source) of an electric motor (see, for example, Patent Document 1).

  The technology described in Patent Document 1 is an excavator equipped with a battery, which supplies electric power from the battery to a plurality of electric motors via an inverter, and drives a link mechanism that performs excavation work and the like by these electric motors. A hydraulic pump that supplies pressure oil to the cylinder of each actuator is driven. Such an excavator is provided with a means for detecting the remaining amount of the battery, and when it is detected that the remaining amount has decreased and reached a preset threshold value, the power supply from the battery is limited to limit the actuator. Alarm means is provided for restricting the operation of the apparatus and for issuing an alarm informing that effect. This threshold value represents the remaining battery level to which the excavator can move to the charging facility by itself, and the excavator can be prevented from getting stuck by moving the excavator to the charging facility when an alarm is generated.

By the way, in general, in the drive using only the battery, the work time is limited by the charge capacity, and it takes time to charge when the remaining amount of the battery is exhausted. For this reason, the work machine is provided with a mechanism that can use a commercial power source from an external power source, and if the commercial power source can be used, the actuator is driven by the commercial power source and the built-in battery is charged. In the case of work where it is difficult to use a commercial power source, it is preferable to employ a method of driving an actuator by a battery.
JP-A-11-107320

  By the way, in the case of a battery-equipped work vehicle that can use an external power supply, it is the same for the operator whether it is driven by a battery (hereinafter referred to as battery drive) or driven by an external power supply (hereinafter referred to as external power supply drive). It is desirable to be able to work in a work sense.

  However, in general, the power obtained from the battery is different from the power obtained from the external power source. Therefore, even if the operator performs a lever operation of the same operation amount between the battery drive and the external power supply drive, The movement of each part of the work vehicle is different, and therefore the work amount is also different. In this case, the operator can recognize whether battery driving or external power supply driving is performed before starting the work, and if the operator operates based on the recognition, the operator can operate the work without any sense of incongruity. However, the operator does not always perform a work operation based on such recognition.

  That is, when an external power supply is connected to the work machine with a power cable, the work machine generally charges the battery with this external power supply and becomes a drive source for the actuator. For this reason, work has been done with battery power until now, but when switching to external power supply by connecting an external power supply, the operator does not recognize this and works in a state that is conscious of the previous battery drive. Since the power of the external power source is large when the operation is started, the work amount of the work vehicle is large for the lever operation of the same operation amount, and the operator feels uncomfortable. On the contrary, when external driving has been performed so far, it is changed to battery driving by removing the external power supply, so that the operator does not recognize this and is aware of the previous external power driving. When the operation is started, particularly when the remaining amount of the battery is decreasing, the response speed of the actuator with respect to the lever operation is slow, and the operator feels uncomfortable.

  In addition, when an external power source is connected, the path of the power source may be different between when the external power source is driven and when the battery is charged by the external power source. In such a case, when the work vehicle is started by switching from the battery charge state to the external power supply drive state, the response time until the switch to the external power supply drive state is reached due to the difference in the path of these power supplies. There will be a delay. In particular, when the actuator is started by switching from the charged state of the battery to the external power supply driving state, a significant delay occurs in the response speed of the actuator with respect to the operation for that purpose, causing a problem that it is difficult for the operator to operate.

  The object of the present invention is to solve such a problem, the operator can operate without any sense of incongruity in either battery drive or external power supply drive, and the response speed of the operation to the operation by switching from the charged state of the battery to the drive mode. An object of the present invention is to provide a work vehicle that can greatly reduce the delay of the vehicle.

  In order to achieve the above object, the present invention is a work vehicle equipped with a battery for driving an actuator and capable of connecting an external power source for charging the battery and driving the actuator, A first means for instructing driving of the actuator by the battery and driving of the actuator by the external power supply, and a second means for instructing charging of the battery by the external power supply are provided.

  Further, the present invention is characterized in that the second means is an input means for a charging instruction by an operator, and the battery is charged by the external power source only by an operation of the input means. Is.

  According to the present invention, the actuator can be driven while the battery is charged by the driving instruction by the first means while the battery is being charged by the external power source according to the instruction of the second means. It is characterized by that.

  The present invention also provides a work vehicle equipped with a battery for driving an actuator and capable of being connected to an external power source for charging the battery and driving the actuator. Third means for instructing driving of the actuator by the external power source, and fourth means for detecting that the operation by the operator is not performed for a predetermined time in the driving mode of the actuator set by the instruction by the first means; And a fifth means for starting charging of the battery by the external power source based on a detection result by the fourth means.

  Further, the present invention provides a sixth means for detecting an operation by an operator during charging of the battery by the fifth means, and while charging the battery based on a detection result by the sixth means. And a seventh means for setting a driving mode of the actuator by the external power source.

  According to the present invention, since the operator can recognize the battery drive and the external power supply drive and perform the drive operation thereof, the operator does not feel uncomfortable with the operation.

  In addition, since the battery is charged when the operator does not perform an operation even after a certain period of time, if the operator operates until the certain period of time elapses, the actuator starts and the actuator is The time to start can be shortened.

  In addition, even during charging, the actuator can be switched to the drive mode while being charged by the operation of the operator, so the time until the actuator is started when the mode is switched from the charge mode to the drive mode is shortened. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view showing a first embodiment of a work vehicle according to the present invention. As an example, a battery-powered excavator is shown, where 1 is a work vehicle of this embodiment and 2 is an external power supply source. 3 is an upper turning body, 4 is a lower traveling body, 5 is a cab, 6 is a link mechanism (front), 6a is a boom, 6b is an arm, 6c is a bucket, 7 is a turning wheel, 8 is a traveling crawler belt, 9 A traveling motor, 10 is a battery, 11 is an external power source, and 12 is a power cable.

  Hereinafter, a battery-type electric excavator (hereinafter, abbreviated as an excavator) will be described as an example of the work vehicle of this embodiment, but the present invention is not limited to this.

  In FIG. 1, an excavator 1 is composed of a lower traveling body 4 and an upper revolving body 3 mounted on the upper traveling body 3 by a revolving wheel 7 that is rotationally driven by a revolving motor (not shown). The upper swing body 3 includes various switches for the operator to perform operations for operation, operation members such as operation levers and lock levers for operations (that is, traveling, turning, and driving of the link mechanism 6), the state of the excavator 1, and the like. There is provided a cab 5 provided with a display device or the like, and a link mechanism 6 for performing work such as excavation by an operator's operation in the cab 5.

  The link mechanism 6 is attached to a rotating shaft (not shown) provided on the upper swing body 3 and is rotatable on a vertical plane, and a rotating shaft provided at the tip of the boom 6a. An arm 6b which is attached and can be rotated in a vertical plane, and a bucket 6c which is attached to a rotary shaft provided at the tip of the arm 6b and is rotatable in a vertical plane. The 6b and the bucket 6c are rotated by driving an actuator (not shown), and a predetermined work is performed.

  A turning wheel 7 is provided between the upper turning body 3 and the lower traveling body 4, and the upper turning body 3 is rotated by rotating the turning wheel 7 by the operation of the turning motor in the cab 5. Rotate on 4. The lower traveling body 4 is provided with a traveling crawler belt 8 and a traveling motor 9 that drives the traveling crawler belt 8. In addition, although not shown, the same traveling crawler belt 8 and traveling motor 9 are provided on the opposite side of the lower traveling body 4 from the illustrated one. The traveling motor 9 is operated by the operation in the driver's cab 5, and the traveling crawler belt 8 is driven thereby, so that the lower traveling body 4, and thus the excavator 1 performs traveling operation such as forward or backward.

  The upper swing body 3 is also equipped with a battery 10, and a hydraulic pump motor (hydraulic motor) for supplying pressure oil to the swing wheel 7, the travel motor 9, and the actuator in the link mechanism 6 for driving. Used as a power source for

  Although not shown, the upper swing body 3 is further provided with a charging device and an external power connection port described later. By connecting the power cable 12 of the external power supply source 2 to the external power connection port, The external power supply 11 of the external power supply source 2 can be connected to the charging device. The power cable 12, and thus the external power source 11, can be attached to and detached from the upper swing body 3 of the excavator 1. When the power cable 12 is connected, the battery 10 can be charged by the external power source 11 via the charging device. In addition, it becomes a power source for the turning wheel 7, the traveling motor 9, the hydraulic motor in the link mechanism 6, and the like.

  FIG. 2 is a block diagram showing a specific example of the control system provided in the excavator 1 in FIG. 1, wherein 9L is a left traveling motor, 9R is a right traveling motor, 13 is a control device, and 14 is an external power connection port ( Connector), 15 is a charging device, 16a is a power switch, 16b is a charging switch, 17, 18, 19L and 19R are inverters, 20 is a drive motor for the link mechanism 6 (FIG. 1), 21 is a turning motor, and 22 is a hydraulic pump. , 23 are status display devices, and parts corresponding to those in FIG.

  In the figure, an auxiliary power source (control device power supply) (not shown) is connected to various operation switches, various operation levers, and lock levers of an operation section (not shown) provided in the control device 13 and the cab 5 (FIG. 1). For example, an auxiliary power supply voltage of 24 V is supplied from VS.

  When an activation key is inserted and turned in a key hole in an operation section (not shown) of the cab 5 and the key switch is turned from the OFF state to the ON state, an auxiliary power supply voltage is supplied from the control device power supply VS to the control device 13 to operate. In addition, the control device 13 supplies a power supply voltage to the state display device 23 to put it in an operating state. Then, when the key switch is in the ON state, the key switch signal SD1 is supplied from the key switch to the control device 13 when the start key is turned to start the key switch. As a result, the control device 13 sends a switching control signal SC1 to the power switch 16a to turn it on (closed). When the power switch 16a is in the ON state, for example, a high DC power supply voltage of 300V from the battery 10 is supplied to the inverters 17, 18, 19L, 19R via the power switch 16a, and the operation lever is operated. By doing so, the excavator 1 is in an operable state in which work can be performed. In this state, the key switch is turned on by releasing the start key, but this operating state is maintained as it is. Further, when the key switch is turned from the ON state to the OFF state by operating the start key in such an operating state, the key switch signal SD1 is not supplied, and at the same time, the control device 13 sends the switching control signal SC1 to the power switch 16a. This is turned off (open). As a result, power is not supplied to the inverters 17, 18, 19L, and 19R, and the excavator 1 is not operated even when the operation lever is operated. Then, the supply of the auxiliary power supply voltage from the control device power supply VS to the control device 13 ends.

  When the excavator 1 is in an operating state and an operation lever (not shown) for work (hereinafter simply referred to as an operation lever) is operated, a lever operation amount signal SD2 corresponding to the operation amount of the operation lever is supplied to the control device 13. The As a result, the control device 13 sends the actuator command signal SC3 to the hydraulic inverter 16, the turning inverter 17 or the traveling inverters 19L and 19R corresponding to the operated lever, and the operation according to the operation amount. To do. When a lock lever (not shown) is operated, a lock lever signal SD3 is supplied to the control device 13, and the control device 13 sends a switching control signal SC1 to the power switch 16a to turn it off. As a result, the excavator 1 is in a locked state in which it does not operate (work) even if it is inadvertently touched on the operation lever or operated unintentionally while the key switch is in the ON state.

  When the battery 10 or the external power supply 11 is connected, the inverters 17, 18, 19L, 19R convert the DC power supply voltage from the charging device 15 into an AC voltage, and drive motors 20, 21, 9L, 9R AC power supply voltages are created, and the operation is controlled to be turned ON / OFF according to the actuator command signal SC3 from the control device 13, and the AC power supply voltage is controlled according to the operation amount of the operation lever. Duty ratio and polarity are controlled. Thereby, the rotational speed and direction of these drive motors 20, 21, 9L, 9R are controlled. The hydraulic pump 21 sends pressure oil to an actuator (not shown) according to the rotational speed and direction of the hydraulic drive motor 20, whereby the link mechanism 6 (FIG. 1) responds to the operation of the drive operation lever. To work. Further, the turning wheel 7 (FIG. 1) rotates in a direction corresponding to the rotation direction at a speed corresponding to the rotation speed of the turning motor 21 in the turning system, and accordingly, the upper turning body according to the operation of the operation lever for turning. 3 (FIG. 1) performs a turning motion. Further, the lower traveling body 3 (FIG. 1) and, therefore, the excavator 1 is operated at a speed corresponding to the operation of the operating lever for traveling by the rotational speed and the rotational direction of the left traveling motor 9L and the right traveling motor 9R of the traveling system. Move forward or backward.

  When the lock lever is operated, as described above, the control device 13 generates the switching control signal SC1 based on the lock lever signal SD3. As a result, the power switch 16a is turned off and the shovel 1 is brought into the locked state. Become.

  Here, the drive motor 20 drives the hydraulic pump 21. The hydraulic pump 21 supplies pressure oil to an actuator for operating the boom 6a in the link mechanism 6 of the shovel 1 shown in FIG. A hydraulic pump that supplies pressure oil to an actuator for operating the arm 6b, and a hydraulic pump that supplies pressure oil to an actuator for operating the bucket 6c. Therefore, the drive motor 20 and the inverter 18 collectively show the drive motor and the inverter for each of these hydraulic pumps.

  Here, the rear part of the upper swing body 3 (FIG. 1) of the excavator 1 is provided with an external power connection port (connector) 14 to which the power cable 12 can be attached and detached, and a charging device 15 connected thereto. When the power cable 12 from the external power supply 11 is connected to the external power supply connection port 14, an AC voltage is supplied from the external power supply 11 to the charging device 15 through the power cable 12, and is converted into a DC voltage here. . This DC voltage is supplied to the battery 10 via the charging switch 16b. Thereby, the battery 10 is charged. The charging switch 16b is ON / OFF (open / close) controlled by a switching control signal SC2 from the control device 13. In addition, when the power cable 12 is connected to the external power supply connection port 14 and an AC voltage is supplied from the external power supply 11 to the charging device 15 to generate a DC voltage for charging, the charging device 15 detects this, An external power connection signal DS indicating that the power cable 12 is connected to the external power supply connection port 14, and thus the excavator 1, is generated and supplied to the control device 13.

  The control device 13 takes in the external power connection signal DS from the charging device 15 and constantly monitors whether or not the power cable 12 is connected to the external power connection port 14. When a charging operation switch (not shown) in the cab 5 (FIG. 1) is operated in a state where the power cable 12 is connected to the external power connection port 14, a charging switch signal SD4 is supplied to the control device 13. . The control device 13 generates a switching control signal SC2 based on the charging switch signal SD4 to turn on the charging switch 16b. Thereby, the battery 10 is automatically charged by the charging device 15.

  Note that this charging operation switch is a momentary switch that retains the ON or OFF information due to the pushing operation, although it returns to its original state when it is released with the fingertip pressed. Each time this charging operation switch is operated, the charging switch 16b is alternately switched ON and OFF by the charging switch signal SD4 from the control device 13.

  Further, the control device 13 constantly detects the remaining battery level DB of the battery 10, and detects that the charging amount of the battery 10 being charged by the external power source 11 is full (100% battery remaining amount). A switching control signal SC2 is generated to turn off the charging switch 16b. Thereby, charging of the battery 10 is automatically terminated. Even when the power cable 12 is removed from the external power supply connection port 14, the control device 13 detects this by the external power supply connection signal DS, generates the switching control signal SC2, and turns off the charging switch 16b.

  In the first embodiment, in this configuration, the mode switching between the driving mode by the battery 10 or the external power source 11 and the charging mode in which only the charging of the battery 10 is performed is performed by operating the key switch and the charging operation switch. However, switching between the driving mode and the charging mode by operating the charging operation switch will be described with reference to FIG.

  In FIG. 3, the key switch is in one of the OFF, ON, and start states, but when the key switch is in the OFF state, neither the drive mode nor the charge mode is set, and the control operation is performed on the control device 13. The auxiliary power supply voltage from the power supply VS is not supplied, and the power switch 16a and the charge switch 16b are also in an OFF state and are in a non-operating state.

  In this state, when the operator inserts the activation key into the key hole and turns it to turn on the key switch, the auxiliary power supply voltage is supplied from the control device power supply VS to the control device 13 and the drive mode S1 is set. 13 is in a driving standby (stopped) state S11 in which the excavator 1 cannot be operated while the switching control signals SC1 and SC2 are not generated and the power switch 16a and the charging switch 16b are kept in the OFF state. In this drive standby (stop) state S11, the control device 13 causes the state display device 23 to be in an operating state and displays state information of each part.

  In this drive standby (stop) state S11, when the operator further operates the start key to start the key switch, the control device 13 causes the control device 13 to switch the switching control signal SC1 according to the key switch signal SD1 supplied at this time. Is switched to the motor drive state S12 in which the power switch 16a is turned on. In this motor drive state S12, the charge switch 16b is held in the OFF state as it is. In this case, when the hand is released from the start key, the key switch returns to the ON state, but the motor drive state S12 is set and held by setting the start state of the key switch.

  In this motor drive state S12, the power supply voltage is supplied from the battery 10 to the inverters 17, 18, 19L, 19R via the power switch 16a, and the battery 10 is driven, that is, the battery is driven. . At this time, when the operator operates a desired operation lever, a lever operation amount signal SD2 corresponding to the operation lever is supplied to the control device 13, and an actuator command signal SC3 corresponding to the lever operation amount signal SD2 is supplied to the inverters 17, 18. , 19L, 19R is supplied to an inverter corresponding to the operated operation lever, and the excavator 1 performs an operation (work) according to the operation amount of the operation lever.

  Thereafter, when the operator turns the start key to return to the original state and turns the key switch to the OFF state, the driving end state S13 is entered. In this drive end state S13, the key switch signal SD1 resulting from the key switch being turned off is supplied to the control device 13, so that the control device 13 turns the power switch 16a to the OFF state by the switching control signal SC1. In addition, the supply of the auxiliary power supply voltage from the control device power supply VS to the control device 13 is stopped, the power supply is shut off, and the drive mode S1 is released.

  By the way, when the operator turns on the charging operation switch in the driving standby (stopped) state S11 of the driving mode S1, the charging mode S2 is entered, and the charging switch signal SD4 is supplied to the control device 13. At this time, when the power cable 12 of the external power supply source 2 is connected to the external power connection port 14 and the charge amount of the battery 10 is not full (100%), the control device 13 outputs the switching control signal SC2. . Thereby, the charging switch 16b is turned on, and the battery 10 is charged from the external power source 11 via the charging device 15. At this time, the power switch 16a is held in the OFF state. This state of the excavator 1 is the charging standby (stopped) state S21 in the charging mode S2, in which only the charging is performed and the excavator 1 cannot be operated.

  In this charging standby state S21, when the operator turns off the charging operation switch, the control device 13 returns to the driving standby (stopped) state S11 of the driving mode S1 by the switching control signal SC2.

  In the charging standby state S21, the driving standby (stopped) state S11 of the driving mode S1 is not released, the auxiliary power supply voltage is supplied to the control device 13 from the control device power supply VS, and the state display device 23 is also configured. It is in the ON state. When the operator operates the start key in this state to turn the key switch to the OFF state, the charging state S22 is entered, and the control device 13 continues to be supplied with the auxiliary power supply voltage from the control device power supply VS and is kept in the operating state, and the charging switch 16b. Is kept in the ON state, but the state display device 23 is turned off. Thus, in this charging state S22, only charging of the battery 10 from the external power source 11 is performed.

  In this charging state S22, when the key switch returns to the ON state by the operation of the start key of the operator, the state display device 23 returns to the ON state after returning to the charging standby state S21.

  Moreover, when said charge state S22 continues and the charge amount of the battery 10 will be full, the control apparatus 13 will detect this from battery remaining amount DB, and will be set to charge completion state S23. In the charging end state S23, the control device 13 temporarily turns on the state display device 23 to notify the operator of the end of charging, and then switches the charging switch 16b to the OFF state by the switching control signal SC2. Then, the supply of the auxiliary power supply voltage from the control device power supply VS to the control device 13 is also finished, the power supply is shut off, and the charging mode S2 is finished.

  Even if the operator operates the charging switch 16b to be in the OFF state in the charging state S22, the charging mode S2 is ended similarly in the charging end state S23.

  When the key switch and the charging operation switch are in the charging standby state S21 in the charging mode S2 in which the key switch and the charging operation switch are turned on, if the operator performs an operation to start the key switch, the charging from the external power source 11 to the battery 10 is performed. , The control device 13 turns on the power switch 16a by the switching control signal SC1, and shifts to the motor drive state S12 in the drive mode S1 that enables various operations of the excavator 1. In this case, driving by the external power source 11, that is, driving of the external power source is performed. In this case, in this motor drive state S12, even if the remaining amount of the battery 10 is full, the charge switch 16b is kept in the ON state as it is. In this case as well, when the hand is released from the start key, the key switch returns to the ON state, but this motor drive state S12 is set and held by setting the start state of the key switch.

  Then, when the operation of the excavator 1 is completed in the motor drive state S12 and the operator operates the start key and turns off the key switch, the drive end state S13 is entered, and the control device 13 is charged by the switching control signal SC2. The switch 16b is switched to the OFF state to end the charging of the battery 10, the auxiliary power supply voltage is turned off from the control device power supply VS, and the drive mode S1 is released.

  As described above, in the first embodiment, the operation for driving the motor for the work of the excavator 1 (operation in the motor driving mode) is performed by operating the key switch, and the charging of the battery is performed by the charging operation switch. Therefore, the switch to be operated differs depending on the mode, and the operator can surely recognize each mode. Therefore, even if an operation for driving the actuator is performed or an operation for charging the battery 10 is performed, each operation can be performed without a sense of incongruity.

  Further, when starting the external power supply driving the motor under the external power supply, the battery is switched from the state of charge to the external power supply while maintaining the state of charge. Therefore, it is not necessary to switch from the charging state to the motor driving state, the switching to the external power source driving state is performed quickly, and the operation of the actuator can be performed immediately.

  Further, in the charging mode S2, since the battery 10 is continuously charged even when the key switch is turned off, the charging is continued even if the activation key of the key switch is removed. Although it takes time to charge the battery, if the operator can detach from the excavator 1 during this time, the excavator 1 can be removed from the key hole of the excavator 1, so that the excavator 1 can be stolen or others can mistakenly It is possible to prevent the vehicle body from being moved by operating.

  FIG. 4 is a diagram showing switching between the driving mode and the charging mode by operating the charging operation switch in the control system of the second embodiment of the work vehicle according to the present invention. The parts corresponding to those in FIG. A duplicate description is omitted. The second embodiment also has the configuration shown in FIGS. The mode switching will be described below with reference to FIG.

  In FIG. 4, in the second embodiment as well, the drive standby (stopped) state S11 of the drive mode S1 is brought about by turning on the key switch, as in the first embodiment, but this drive standby (stopped). When a certain time set in advance in the state S11 has elapsed, when the external power source 11 is connected to the charging device 15, the control device 13 outputs a switching control signal SC2 to turn on the charging switch 16b, and the battery 10 The charging standby state (stopped) state S21 of the charging mode S2 in which charging is performed is entered. In this case, although the charging operation switch is not operated, the control device 13 regards this charging operation switch as being turned ON, and thereby outputs the switching control signal SC2.

  In this case, although not shown, if the charging operation switch is turned off in the charging standby (stopped) state S21, the charging switch 16b is turned off by the switching control signal SC2 from the control device 13 as in FIG. Then, the drive may return to the drive standby (stop) state S11 of the drive mode S1.

  When the key switch is operated to enter the start state in the charging standby (stopped) state S21 as in the first embodiment, the power switch 16a is turned on by the switching control signal SC1 from the control device 13. In the second embodiment, even if the operation lever in the cab 5 (FIG. 1) is operated in the charging standby (stopped) state S21, the transition to the motor driving state S11 in the driving mode S1 is performed. The process shifts to the motor drive state S11 of the drive mode S1, and the external power supply drive with the charging of the battery 10 becomes possible.

  In the second embodiment, the external power supply 11 is connected to the charging device 15 when no operation lever is operated even if the motor driving state S12 in the driving mode S1 has been determined for a predetermined time. If so, the process proceeds to the charging standby (stopped) state S21 in the charging mode S2, and the battery 10 is charged from the external power source 11. In this case, when the motor drive state S12 is due to the drive standby (stop) state S11 and the key switch is operated to the start state, the charge switch 16b is turned on by the switching control signal SC2 from the control device 13. When the battery 10 is charged, the charging mode S2 is in the charging standby (stopped) state S21, and the motor drive state S12 is in the charging mode S2 charging standby (stopped) state S21. When operated in the start state or when the lever operation is performed, the battery 10 is charged even in the motor driving state S12, and the charging standby (stopped) state S21 in the charging mode S2. This charging is continued even after shifting to.

  Operations other than those described above are the same as in the previous embodiment.

  As described above, in the second embodiment, no operation is performed in the states S11 and S12 of the drive mode S1, and the external power supply 11 is connected after a certain period of time as it is. When the external power source 11 and the battery 10 have time allowance without performing any operation, the battery 10 is charged using the external power source 11. is there. For this reason, the operation of the operator for this charging is unnecessary (the charging operation switch is unnecessary), and the connected external power supply 11 can be used effectively.

  Further, even in the charging mode S2 (however, in the charging standby (stopped) state S21), the operation of the operation lever causes the external power supply driving state, so that the actuator immediately operates in response to this operation. Response speed delay is eliminated.

  Instead of switching between the driving mode S1 and the charging mode S2, the amount of charge of the battery 10 may be increased or decreased according to the operation.

1 is a schematic side view showing a first embodiment of a work vehicle according to the present invention. It is a block diagram which shows one specific example of the control system provided in the shovel in FIG. FIG. 3 is a diagram showing switching between a driving mode and a charging mode by operating a charging operation switch in the control system shown in FIG. 2. It is a figure which shows switching with the drive mode in the control system of 1st Embodiment of the working vehicle by this invention, and the charge mode by operation of a charge operation switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 External power supply source 3 Upper revolving structure 4 Lower traveling structure 5 Driver's cab 6 Link mechanism 6a Booth 6b Arm 6c Bucket 7 Turning wheel 8 Travel crawler 9 Traveling motor 9L Left traveling motor 9R Right traveling motor 10 Battery 11 External power supply 12 Power cable 13 Control device 14 External power supply connection port (connector)
DESCRIPTION OF SYMBOLS 15 Charging device 16a Power switch 16b Charging switch 17, 18, 19L, 19R Inverter 20 Drive motor 21 Turning motor 22 Hydraulic pump 23 Status display device

Claims (5)

In a work vehicle equipped with a battery for driving an actuator and capable of connecting an external power source for charging the battery and driving the actuator,
First means for instructing driving of the actuator by the battery and driving of the actuator by the external power source;
And a second means for instructing charging of the battery by the external power source. In claim 1,
The second means is an input means for charging instructions by an operator,
The work vehicle, wherein the battery is charged by the external power source only by operating the input means. In claim 1 or 2,
During the charging of the battery by the external power source according to the instruction from the second means, the actuator can be driven while charging the battery according to the driving instruction from the first means. Work vehicle. In a work vehicle equipped with a battery for driving an actuator and capable of connecting an external power source for charging the battery and driving the actuator,
A third means for instructing driving of the actuator by the battery and driving of the actuator by the external power source;
A fourth means for detecting that the operation by the operator is not performed for a predetermined time in the driving mode of the actuator set by the instruction by the first means;
A work vehicle comprising: fifth means for starting charging of the battery by the external power source based on a detection result by the fourth means. In claim 4,
A sixth means for detecting an operation by an operator during charging of the battery by the fifth means;
A work vehicle comprising: seventh means for setting a driving mode of the actuator by the external power supply while continuing to charge the battery based on a detection result by the sixth means.

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