JP2008038503A - Hybrid type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic shovel having an electric power generator 12 for generating and supplying electric power to a magnet 7 thereby permitting to effectively utilize the electric power generator 12 for supplementing an engine driving force when substituting another working machine installed for the magnet 7. <P>SOLUTION: The electric power generator 12 is utilized as a rotary electric machine 12 having a motor driving function; when another working machine is installed, the rotary electric machine 12 is utilized as a power generator for charging a battery 26 while an engine 8 is being driven for a low load; and when the rotary electric machine is being driven for a high load, the engine driving force is supplemented by the electric power charged previously to the battery 26 during a high load driving, thereby achieving the hybrid type working machine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a hybrid work machine such as a hydraulic excavator that can be equipped with a magnet device capable of magnetically attaching a magnetic material as a work tool.

Generally, in a construction machine, if this is a hydraulic excavator, a magnet (lifting magnet) is attached to the front end of the front attachment as a work tool, and for example, a magnetic material such as iron scrap is adsorbed (magnetized) from building waste. Wear) and lift it up for separation. In this case, the magnet device is configured to be able to switch the magnetizing force on and off as an electromagnet in order to facilitate the detachment of the adsorbed magnetic material. Therefore, it is necessary to install a generator in such a construction machine. However, when the magnet is mounted, there is a problem that this electricity is wasted because electricity is not required at the time of detachment.
Therefore, it is known that when the magnet device does not require electric power, the electric power is stored in a battery, and the stored electric power is supplied when the magnet device is used (see Patent Document 1).
See JP-A-2005-1775

  By the way, those that try to charge the battery with power that is wasted when not in use are used to supply the charged power to the magnet device when the magnet device is used, so it is used only for dedicated work machines equipped with a magnet device. However, when the magnet device is employed in a multi-spec work machine that can be replaced with a bucket, for example, there is a problem that the magnet device functions only when the magnet device is mounted. is there.

SUMMARY OF THE INVENTION The present invention was created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is linked to the engine and the engine, and has both functions of power generation and drive. A rotating electric machine having power, a charging means capable of charging and discharging electric power, a work attachment capable of selecting and attaching an electromagnet type magnet device and other work equipment such as a bucket, and a load detecting means for detecting an engine load When the working device is a magnet device, when the working device is another working device, the generated power supply circuit means that can supply the magnet device with the power generated by the rotating electrical machine that has been driven by the engine, A charging circuit means capable of supplying the charging means with the electric power generated by the rotating electric machine driven by the engine when the load detection means is in a low load state; When the work equipment is another work equipment, when the load detecting means is in a high load state, the electric power charged in the charging means is supplied to the rotating electrical machine to drive the rotating electrical machine to replenish the engine drive. A hybrid work machine comprising: a rotating electrical machine drive circuit means that performs the above-described control means that can execute switching control of the circuit means.
According to a second aspect of the present invention, the control means can determine the idling stop state, and when the restart operation is performed in the idling step state, the control means supplies the electric power charged in the charging means to the rotating electric machine to drive the engine. An engine restarting circuit means capable of restarting is provided.

According to the first aspect of the present invention, when a magnet is mounted, the rotating electrical machine is provided with a rotating electrical machine for supplying the generated power to the magnet, and the rotating electrical machine is other than the magnet. When the work equipment is installed, when the engine is driven at a high load, the electric power charged in the charging means is supplied to the rotating electrical machine to drive the rotating electrical machine, so that the engine drive can be replenished. When the load is being driven, the rotating electrical machine can function as a generator to charge the generated power, and the work machine to which work equipment other than the magnet can be attached can be hybridized, reducing fuel consumption. it can.
According to the invention of claim 2, when the engine is restarted from the idling stop state, the engine can be restarted by using the rotating electrical machine that supplies current to the magnet device, and hybridization can be achieved.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a traveling machine body of a hydraulic excavator, and the traveling machine body 1 is configured such that an upper swing body 3 is pivotably assembled to a crawler type lower travel body 2. A front attachment 6 including a boom 4 and an arm 5 is provided, and a magnet device 7 is attached to a distal end portion of the arm 5 as a work attachment (working tool). 4a is a boom cylinder, 5a is an arm cylinder, and 7a is a work tool cylinder (bucket cylinder).

  Reference numeral 8 denotes an engine mounted on the upper swing body 3. The driving force of the engine 8 is input to a hydraulic pump power distribution device 9, and the main pump 10 is driven by a gear transmission mechanism 9 a disposed in the distribution device 9. , 11 is output after power distribution. Pressure oil is supplied from the main pumps 10 and 11, the boom cylinder 4 a, the arm cylinder 5 a, the work tool cylinder 7 a, a turning motor 14 for turning the upper swing body 3, The hydraulic motors 15 and 16 are supplied to perform corresponding hydraulic operations.

  On the other hand, reference numeral 12 denotes a rotating electric machine having both functions of a generator and an electric motor. A transmission gear 12b provided on a rotor shaft 12a of the rotating electric machine 12 is linked to the gear transmission mechanism 9a via an intermediate gear 17. Has been. The rotating electrical machine 12 generates power based on the rotation of the intermediate gear 17 and the transmission gear 12b in conjunction with the driving of the engine 8, and outputs the generated power to the rotating electrical machine controller 18, as will be described later. Thus, the transmission gear 12b is rotated by driving and rotating by receiving electric power from the rotating electrical machine controller 18.

  Reference numeral 19 denotes a control unit, to which the rotating electrical machine controller 18 is connected, and a mode switching switch 20, a magnet operation switch 21, a monitor 22, a battery controller 23, and an engine rotation detector 24. , A magnet controller 25, a voltage detector 27 for detecting the state of charge (SOC) of the battery 26, and a hydraulic pressure detection sensor 28 provided in a hydraulic circuit from the main pumps 10 and 11 to detect the level of engine load, respectively. They are connected and input / output corresponding signals.

  On the other hand, the rotating electrical machine controller 18 includes a direct current / alternating current (DC / AC) conversion circuit 18a that converts direct current into alternating current and an alternating current / direct current (AC / DC) conversion circuit 18b that converts alternating current into direct current. When the conversion circuit is selected by a switching command from the control unit 19 and the DC / AC conversion circuit 18a is selected, a battery 26 (even a capacitor) connected to the battery controller 23 is provided. When the AC / DC circuit 18b is selected, the AC current generated by the rotating electrical machine 12 is converted into the alternating current converted from the DC discharge current. It is set so as to be converted into a direct current and supplied to the battery controller 23 or the magnet controller 25.

  The battery controller 23 includes a charging circuit 23a for charging the battery 26 with a DC current output from the rotating electrical machine controller 18 and the DC current charged in the battery 26 with the rotating electrical machine controller 18 or the magnet controller 25. A discharge circuit 23b for discharging is provided on the side, and selection of these circuits 23a and 23b is switched by a control command from the control unit 19. Further, the magnet controller 25 receives a control command from the control unit 19, a current supply circuit 25 a that switches between a state of supplying current to the magnet unit 7 side and a state of stopping the current supply, and a current flowing through the magnet unit 7. A current detection circuit 25b that detects and outputs the detected value to the control unit 19 is provided.

  Next, the control procedure in the control part 19 is demonstrated based on the flowchart figure shown in FIGS. First, when the engine is started and the power is turned on, the control unit 19 starts the system, makes an initial setting, and enters an activated state. Then, what is the current mode, that is, the mode changeover switch 20 is in the magnet work mode with the magnet device 7 attached, or the work device with the magnet device 7e is E, for example, a bucket is attached and the magnet is not working. It is determined whether the mode is set or the idling stop mode is set regardless of the mode, and the control routine is shifted to. Incidentally, the idling stop mode can be determined by inputting that the detection signal from the engine rotation detector 24 is in the engine stop (not rotating) state in the system start state (power-on state). The idling stop is executed when the idling state has elapsed for a predetermined time or when the idling stop switch is operated.

When the routine proceeds to the magnet operation mode routine, it is determined whether or not the magnet operation switch 21 is turned on. If it is determined that the magnet operation switch 21 is turned on, the AC / DC conversion circuit is connected to the rotating electrical machine controller 18. A control command for selecting 18a is output, and a control command for switching the current supply circuit 25a to the current supply state is output to the magnet controller 25, whereby the alternating current generated by the rotating electrical machine 12 based on the engine drive is output. Is converted into a direct current, and the converted alternating current is supplied to the magnet device 7, and the magnet device 7 is excited to generate a magnetic adhesion force.
A control command is output for output, whereby the alternating current generated by the rotating electrical machine 12 is converted into a direct current by the rotating electrical machine controller 18, and the converted direct current is passed through the magnet controller 25 to the magnet unit. 7 and the magnet device 7 is excited, and the magnetic material can be magnetically attached.
Whether or not the detected current of the current detection circuit 25b is lower than a preset current during the magnet operation (for example, when a peak current flows or a high current is required at the start of excitation of the magnet device 7). If the determination is YES and the determination of YES is made, the control command for selecting the discharge circuit 23a is output to the battery controller 23, whereby the current stored in the battery 26 is It flows to the magnet controller 25 side via the controller 23, and is controlled so as to supplement the insufficient current.

  On the other hand, when the magnet operation switch 21 is OFF and the magnet device 7 is operated in a non-excited state, the AC / DC conversion circuit 18b is selected for the rotating electrical machine controller 18 and the magnet controller 25 is selected. Switches the current supply circuit 25a to a current non-supply state, and outputs a control command for selecting the charging circuit 23b to the battery controller 23, thereby converting the alternating current generated by the rotating electrical machine 12 into a direct current. The converted direct current is controlled so that the battery 26 is charged.

  On the other hand, when the routine shifts to the magnet non-working mode routine, the magnet controller 25 switches the current supply circuit 25b to the current non-supply state, and the engine load is preset based on the detection signal from the oil pressure detection sensor 28. It is determined whether or not the load is equal to or higher than the set load. If it is determined that the load is higher, the battery voltage detection value from the voltage detection sensor 27 is further equal to or higher than a preset set voltage. If it is determined that the charging state is sufficient as described above, the control unit 19 selects the DC / AC conversion circuit 18a for the rotating electrical machine controller 18 and the battery controller 23. Is output a control command for selecting the discharge circuit 23a, and thus the battery 26 is discharged from the battery 26 through the battery controller 23. The electric current is converted into an alternating current by the rotating electrical machine controller 18 and output to the rotating electrical machine 12, whereby the rotating electrical machine 12 is driven as a motor, replenishes the power of the engine 8, and performs a hybrid operation. Yes.

On the other hand, if it is determined that the detected battery voltage is not equal to or higher than the set voltage, the control command for selecting the AC / DC conversion circuit 18b and the charging circuit 23b is output, and thereby the electric power is generated by the rotating electrical machine 12. The alternating current is converted into a direct current so that the battery 26 is charged.
On the other hand, if NO is determined that the detected engine load is not equal to or higher than a preset load, a control command for selecting the AC / DC conversion circuit 18b and the charging circuit 23b is output, as described above. As a result, the alternating current generated by the rotating electrical machine 12 is converted into a direct current and the battery 26 is charged.

  Further, when the process proceeds to the idling stop mode routine, it is determined whether or not a restart operation has been performed. The restart operation can be performed, for example, by operating an idling stop switch to the start side. If YES is determined that the restart operation has been performed, the current supply circuit 25a is brought into a non-supply state, and the control command for selecting the discharge circuit 23a and the DC / AC conversion circuit 18 value is output. As a result, the direct current charged in the battery is converted into an alternating current to drive the rotating electrical machine 12, and the engine 8 is restarted.

  In the embodiment of the present invention configured as described above, when the magnet unit 8 is mounted, the magnet unit 8 is excited by supplying the electric power generated by the rotating electrical machine 12 so that the magnetizing force is exerted. In the case where a work device other than the magnet device 8 is attached as a work attachment and the magnet non-working mode is set, the engine 8 is in a high load drive detection state while the magnetic material can be magnetically selected. The electric power charged in the battery 26 can be supplied to the rotating electrical machine 12 to drive the rotating electrical machine 12 to replenish the driving force of the engine 8, thereby attaching work equipment other than the magnet device. Hybridization of the machine can be achieved and fuel consumption can be reduced.

  Moreover, in this case, in the magnet non-working mode, when the engine 8 is driven at a low load, the battery 26 can be charged with the electric power generated by causing the rotating electrical machine 12 to function as a generator. Since the battery 26 can be charged, it can be prevented that the battery is completely discharged and cannot be used.

  In addition, in this case, when the engine 8 is restarted in the idling stop mode state, the engine 8 can be restarted by using the rotating electrical machine 12 that generates power to supply power to the magnet unit 7. Hybridization can also be achieved.

It is a schematic side view of a hydraulic cylinder. It is a schematic plan view which shows the state which mounted the rotary electric machine in the engine. It is a block circuit diagram of control. It is a flowchart figure which shows the procedure of main control. It is a flowchart figure which shows the procedure of a magnet work mode. It is a flowchart figure which shows the procedure of a magnet non-working mode. It is a flowchart figure which shows the procedure of idling stop mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 7 Magnet device 8 Engine 12 Rotating electric machine 18 Rotating electric machine controller 18a DC / AC conversion circuit 18b AC / DC conversion circuit 19 Control part 20 Mode change switch 21 Magnet operation switch 23 Battery controller 23a Discharge circuit 23b Charging circuit 25 Magnet controller 25a Current supply circuit 26 Battery 28 Oil pressure detection sensor

Claims (2)

Engine,
A rotating electrical machine linked to the engine and having both power generation and drive functions;
Charging / discharging means capable of charging and discharging electric power;
A work attachment that can be mounted by selecting and installing an electromagnet magnet and other work equipment such as a bucket;
Load detection means for detecting engine load;
When the working device is a magnet device, generated power supply circuit means capable of supplying the magnet device with the power generated by the rotating electrical machine that has been driven by the engine,
When the work equipment is another work equipment, when the load detection means is in a low load state, the charging circuit means capable of supplying the power generated by the rotating electrical machine driven by the engine to the charging means,
When the work device is another work device and the load detection means is in a high load state, the electric power charged in the charging means is supplied to the rotating electrical machine to drive the rotating electrical machine and replenish the engine drive. Rotating electric machine drive circuit means for
A hybrid working machine comprising control means capable of executing switching control of the circuit means.   The control means can determine the idling stop state, and when the restart operation is performed in the idling step state, the engine can be restarted by supplying the electric power charged in the charging means to the rotating electric machine and driving it. A hybrid work machine, characterized in that an engine restart circuit means is provided.

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