JP2008109764A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically stop power feeding to a battery monitoring device, after the termination of cell balance operation by the battery monitoring device. <P>SOLUTION: In a hybrid shovel, a battery-monitoring power supply control means 27 is constituted, by arranging a key switch 25 which is on/off-operated at the drive and the stop of a machine and an off-delay timer 26 between a control battery 23, and the battery monitoring device 20, which monitors the battery state of a main battery 19. The off-delay timer 26 is constituted so as to be turned off, after the elapse of a cell balance operation setting time which is necessary for the cell balance operation of the main battery 19 by the battery monitoring device 20, and after the off-operation of the key switch 25, the power feeding to the battery monitoring deice 20 is stopped automatically, when the cell balance operation is terminated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work machine such as an excavator provided with a main battery and a battery monitoring device for monitoring the state of the battery.

  The background art will be described by taking a hybrid excavator as a preferred example of the present invention as an example.

  As shown in FIG. 6, the excavator is configured such that an upper swing body 2 is rotatably mounted on a crawler type lower traveling body 1 and a work attachment 3 is mounted on the upper swing body 2.

  The work attachment 3 includes a boom 4 that can be raised and lowered, an arm 5 attached to the tip of the boom 4, a bucket 6 attached to the tip of the arm 5, and a boom and an arm that are hydraulic actuators for driving them. And bucket cylinders 7, 8, and 9.

  As a turning actuator for turning the upper turning body 2, a turning hydraulic motor is used in the case of a hydraulic excavator, and a turning electric motor is used in the case of a hybrid excavator.

In addition, the hybrid excavator
(A) A series system in which a generator is driven by an engine, and a main battery is charged by the generated power of the generator, and a swing motor is driven by the generator and the main battery,
(B) The hydraulic pump and the generator motor are driven in parallel by the engine, the turning motor is driven by the generator motor or the main battery, the main battery is charged by the generator action of the generator motor, and this main battery is There are two types of parallel systems, in which the generator motor is driven by the stored power and the motor action (engine assist action) is performed.

  In this hybrid excavator, when using a high-voltage, high-performance battery composed of multiple cells connected as a main battery, such as a lithium ion battery, to maximize its characteristics and prevent deterioration Is provided with a battery monitoring device for monitoring the battery state such as voltage, charge amount, temperature and the like.

  This battery monitoring device performs a battery monitoring operation and a cell balance operation using a control battery (also called an auxiliary battery because it is also a power source for electric auxiliary devices such as work lights and electrical components) as a power source.

  As shown in Patent Document 1, this cell balance operation is performed in order to correct each cell voltage variation due to variation in the characteristics of each cell and to keep each cell voltage uniform. Is performed after the operation of the machine is stopped (after the key switch which is the main switch of the machine is turned off).

  Therefore, the control battery needs to supply power to the battery monitoring device while the cell balance operation is performed not only during the machine operation but also after the operation is stopped.

  In this case, when the control battery is directly connected to the battery monitoring device, the battery is quickly exhausted because the power is continuously supplied even after the cell balance operation is finished.

Therefore, in general, a battery monitoring power switch is provided between the control battery and the battery monitoring device separately from the key switch, and the switch is turned off after the operation of the cell balance is finished after stopping the machine operation. It has a configuration.
JP 2004-266917 A

  However, since the battery monitoring power switch is manually operated by an operator, it is bothersome to operate, and forgetting to turn it on or forgetting to cut it occurs.

  If you forget to turn off the battery monitoring power switch, the battery will run out because it is in the same state as the direct battery connection.

  On the other hand, if the switch is forgotten to be turned on, not only does the battery monitoring device not operate, but also the information from the device is not sent to the control device, so the main battery does not function and the machine does not start. This forgetting is easy to occur especially after storing the machine for a long time or after stopping the operation. Moreover, since the switch is not frequently operated from the beginning, it is often installed in a place where it is difficult for the operator to recognize it. There are cases where there is no.

  As a countermeasure against this forgotten insertion, it may be possible to notify the operator with a sound or a monitor display that the switch cannot be started because the switch is off when the battery monitoring power switch is off. The troublesome operation of the switch remains.

  Therefore, the present invention provides a work machine capable of automatically stopping the power supply to the battery monitoring device after the cell balance operation is completed.

  The invention according to claim 1 is a main battery as a main power source constituted by connecting a plurality of cells, a battery monitoring device for monitoring a battery state such as a voltage, a charge amount, and a temperature of the main battery, and A work machine having a control battery as a power source for the apparatus includes battery monitoring power source control means for controlling power supply to the battery monitoring device, and the battery monitoring power source control means is configured to control the main battery after the operation of the machine is stopped. The power supply from the control battery to the battery monitoring device is stopped when the cell balance operation for keeping the voltage of each cell is uniform.

  According to a second aspect of the present invention, in the configuration of the first aspect, a battery switch is provided by providing a key switch that is turned on / off when the machine is operated / stopped and an off-delay timer between the control battery and the battery monitoring device. The power supply control means is configured, and the off-delay timer is configured to be turned off when a cell balance operation set time as a time required for the cell balance operation elapses after the key switch is turned off.

  According to a third aspect of the present invention, in the configuration of the first aspect, a key switch that is turned on / off when the machine is operated / stopped, and a self-holding output from the battery monitoring device that operates when the key switch is turned on. A relay that performs a holding operation is provided between the control battery and the battery monitoring device to constitute a battery monitoring power source control means, and the battery monitoring device is configured to terminate the cell balance operation after the key switch is turned off. In addition, the self-holding output to the relay is stopped.

  According to the present invention, the battery monitoring power source control means is constituted by the key switch and the off-delay timer (Claim 2), or the key switch, the self-holding relay, and the battery monitoring device (Claim 3). After the stop, when the cell balance operation ends, the power supply from the control battery to the battery monitoring device can be automatically stopped.

  For this reason, while ensuring the cell balance function, it is possible to avoid various troubles caused by forgetting to turn off or forgetting to turn on / off the power by the battery power monitoring switch.

  In this case, according to the second aspect of the present invention, it is only necessary to add an off-delay timer, so that the configuration is simple and it can be easily retrofitted to an existing machine.

  According to the invention of claim 3, since the self-holding operation is canceled at the end of the cell balance operation and the power supply is stopped, there is no possibility that the power supply stop is too early or too late.

  An embodiment of the present invention will be described with reference to FIGS.

  In the following embodiments, a hybrid excavator adopting a parallel system is exemplified as an application target.

1st Embodiment (refer FIGS. 1-3)
FIG. 1 shows a block configuration of the hybrid excavator according to the first embodiment.

  As shown in the figure, a variable displacement hydraulic pump 12 and a generator motor 13 that performs a generator action and a motor action are connected in parallel to an engine 10 via a power distribution device (power divider) 11, and these are connected to the engine. 10 to drive.

  A hydraulic circuit 14 is connected to the hydraulic pump 12, and the hydraulic actuators other than the boom cylinder 7 of FIG. 6 (collectively denoted by reference numeral 15) are driven by the pressure oil from the hydraulic pump 12. Although FIG. 1 shows a case where only one hydraulic pump 12 is connected, a plurality of hydraulic pumps 12 may be connected in parallel.

  The electric power from the generator motor 13 is sent to the swing motor 18 via the generator motor controller 16 and the motor controller 17, and the rotational force of the swing motor 18 is sent to the upper swing body 2 of FIG. Is transmitted to the revolving body 2.

  On the other hand, the generator motor 13 includes a high-performance, high-voltage main battery 19 configured by connecting a plurality of cells such as lithium ion batteries as a second power source of the swing motor 18. Connected through.

  The main battery 19 is charged by the generator operation of the generator motor 13, and the generator motor 13 operates the motor by the discharge force of the main battery 19 to assist the engine when appropriate.

  The generator motor controller 16 controls switching between generator operation and motor operation of the generator motor 13, generated power, current or torque as the motor, and the main battery 19 according to whether the generator output of the generator motor 13 is excessive or insufficient. Controls charging / discharging.

  The main battery 19 is connected to a battery monitoring device 20 that monitors the battery state such as voltage, charge amount, temperature, and the like and performs a cell balance operation of the main battery 19, and the battery information from the battery monitoring device 20 is controlled. Sent to the device 21.

  Based on the battery information and other information, the control device 21 commands charge / discharge of the main battery 19, engine rotation speed, pump capacity, torque of the generator motor 13, and other control signals.

  In addition, a control battery 23 is connected to the main battery 19 via a control power supply controller 22, and a work lamp and other electric auxiliary devices 24 and a battery monitoring device 20 are operated using the control battery 23 as a power source.

  In the first embodiment, a key switch 25, which is a main switch of a machine for starting / stopping an engine, and an off-delay timer 26 are connected in series to constitute a battery monitoring power control means 27. This battery monitoring power control Means 27 is connected between the battery monitoring device 20 and the control battery 23. FIG. 2 shows only the battery monitoring power control means 27 and its related parts.

  The off-delay timer 26 starts timing from the time when the key switch 25 is turned off, and is turned off after elapse of the cell balance operation set time as the time required for the cell balance operation.

  FIG. 3 shows this situation as a time chart. After the key switch 25 is turned off (the operation of the machine is stopped) by the action of the off-delay timer, the battery monitoring device 20 waits for the cell balance operation to end and the power to the device 20 is turned on. Supply automatically stops.

  For this reason, while ensuring the cell balance function, it is possible to avoid various troubles caused by forgetting to turn off or forgetting to turn on / off the power by the battery power monitoring switch.

  Further, according to the configuration of the first embodiment, it is only necessary to add the off-delay timer 26. Therefore, the configuration is simple and can be easily retrofitted to an existing machine.

Second embodiment (see FIGS. 4 and 5)
Only differences from the first embodiment will be described.

  In the second embodiment, the key switch 25 and the relay 28 are connected in series, the control battery 23 and the battery monitoring device 20 are connected via the normally open contact 28a of the relay 28, and the relay 28 Is configured to perform a self-holding operation by a self-holding output from the battery monitoring device 20. In FIG. 4, 29 and 30 are backflow prevention diodes.

  The relay 28 is turned on by turning on the key switch 25, and thereafter is kept on by a self-holding output sent from the battery monitoring device 20.

  The battery monitoring device 20 starts the cell balance operation from the time when the key switch 25 is turned off, and stops the self-holding output when the cell balance operation ends.

  That is, the battery monitoring power source control means 31 having a self-holding function is constituted by the key switch 25, the relay 28, and the battery monitoring device 20, and the battery monitoring is performed after the key switch 25 is turned off as shown in FIG. When the cell balance operation of the device 20 is finished, the self-holding operation of the relay 28 is released and the power supply to the battery monitoring device 20 is automatically stopped.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained. In addition, according to the second embodiment, the power supply is stopped when the cell balance operation is completed, so there is no possibility that the power supply stop will be too early or too late.

  By the way, the present invention can be applied to a hybrid excavator adopting a series system. The main battery is not limited to a hybrid excavator, and includes a main battery configured by connecting a plurality of cells, a battery monitoring device that monitors a battery state of the main battery, and a control battery as a power source of the battery monitoring device. Can be widely applied to work machines.

1 is a block configuration diagram of a hybrid excavator according to a first embodiment of the present invention. It is an electric circuit diagram which extracts and shows a part of FIG. It is a time chart for demonstrating the effect | action of 1st Embodiment. FIG. 3 is a view corresponding to FIG. 2 in a hybrid excavator according to a second embodiment of the present invention. It is the figure equivalent to FIG. 1 is a schematic side view of an excavator to which the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Main battery 20 Battery monitoring apparatus 23 Control battery 25 Key switch 26 Off-delay timer 27 Battery monitoring power supply control means 28 Self-holding relay 31 Battery monitoring power supply control means

Claims (3)

  A main battery as a main power source configured by connecting a plurality of cells, a battery monitoring device for monitoring a battery state such as a voltage, a charge amount, and a temperature of the main battery, and a control battery as a power source of the battery monitoring device The battery monitoring power control means controls the power supply to the battery monitoring device, and the battery monitoring power control means equalizes the voltage of each cell of the main battery after the operation of the machine is stopped. A work machine configured to stop the power supply from the control battery to the battery monitoring device when the cell balance operation for maintaining the power is completed.   Between the control battery and the battery monitoring device, a key switch that is turned on / off when the machine is operated / stopped and an off-delay timer are provided to constitute a battery monitoring power source control means. 2. The work machine according to claim 1, wherein the work machine is configured to be turned off when a cell balance operation set time as a time required for the cell balance operation elapses after the switch is turned off.   A control battery and a battery monitoring device include a key switch that is turned on / off when the machine is operated / stopped, and a relay that operates when the key switch is turned on and performs a self-holding operation by a self-holding output from the battery monitoring device. The battery monitoring power supply control means is configured between and the battery monitoring device is configured to stop the self-holding output to the relay when the cell balance operation ends after the key switch is turned off. The work machine according to claim 1, wherein

Images