JP2015155606A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine capable of quickly stopping an apparatus driven by an engine and a generator motor, by operating an engine stopping switch, even in a constitution for mounting the generator motor of large output.

SOLUTION: An inverter control controller 24 for controlling a first inverter 20 connected to an assist power generation motor 10, comprises a first gate signal generation IC 24B for outputting a gate signal to the first inverter 20. The first gate signal generation IC 24B comprises a suppression terminal 24B1, and the suppression terminal 24B1 is connected to an engine stopping switch 30. When operating the engine stopping switch 30, an engine 9 is stopped, and output of the gate signal to the first inverter 20 from the first gate signal generation IC 24B is stopped, and an assist power generation motor 10 is also stopped.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator, a wheel loader, a hydraulic crane, and a forklift, and more particularly to a hybrid construction machine that uses both an engine (internal combustion engine) and an electric motor (assist power generation motor) as power sources.

  In general, a hydraulic excavator as a representative example of a construction machine includes an engine using gasoline, light oil, or the like as a fuel as a power source (motor) for traveling or working. In this case, the hydraulic excavator is configured to operate a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder by the hydraulic oil discharged from the hydraulic pump by driving the hydraulic pump by the engine. Hydraulic actuators are small and light and capable of high output, and are widely used as construction machine actuators.

  On the other hand, a hybrid hydraulic excavator that uses both an engine and an electric motor (electric motor) as a power source for driving and working (prime mover) has been proposed. This hybrid hydraulic excavator has, for example, an engine, a generator function that generates electric power by being driven by the engine, and an electric generator function that assists driving of the engine by being supplied with electric power. Charges the electric power (assisted generator motor), the hydraulic pump that is driven by the engine (and generator motor if necessary) and discharges hydraulic oil to the hydraulic actuators such as working hydraulic cylinders, and the electric power generated by the generator motor Or a power storage device that discharges the charged power, and an electric actuator such as a swing electric motor (swing electric motor) or a travel motor (travel electric motor) that is driven by the electric power of the power storage device. (Patent Document 1).

  Electric actuators are more energy efficient than hydraulic actuators. Specifically, the electric actuator can regenerate kinetic energy at the time of braking as electric energy. On the other hand, in the hydraulic actuator, kinetic energy is released as heat during braking. Therefore, a hydraulic excavator using an electric actuator and a power storage device can improve energy efficiency and save energy compared to a hydraulic excavator using only a hydraulic circuit and a hydraulic actuator.

  Here, the power storage device includes, for example, a battery, an electric double layer capacitor, and the like, and charges (accumulates) electric power generated based on the generator function of the generator motor. Further, the power storage device discharges (power feeds) the charged power to the generator motor, and assists (assists) driving of the engine based on the motor function of the generator motor. For example, when the control of the hydraulic pump and engine is engine speed sensing (ESS) control, the generator motor assists in controlling the assist force in addition to the horsepower reduction control of the hydraulic pump in response to a decrease in the engine speed. Take control. In addition, the generator motor may compensate for the shortage with an assist operation when the load is high, that is, when the engine alone cannot cover the load regardless of the ESS control.

  On the other hand, Patent Document 2 detects an engine stop (engine stall) due to an overload or the like and an engine stall due to fuel shortage based on the deviation between the target engine speed and the actual engine speed and the remaining fuel level. A configuration is described in which engine assist by a generator motor is automatically stopped when a directly connected operating state is detected.

JP 2001-16704 A (Patent No. 3647319) JP 2008-101440 A (Patent No. 5055948)

  By the way, with the increase in the output of the generator motor, it is possible to continue to rotate the hydraulic pump by the generator motor alone even if the engine is stopped. For this reason, for example, even when an engine stop switch for stopping the engine is operated during maintenance or an emergency stop, and the engine is thereby stopped, the hydraulic pump may continue to rotate due to the engine assist of the generator motor. . That is, even if the engine fuel supply (fuel injection) is stopped by the engine stop switch and the engine is stopped, the generator motor continues to rotate, so that the hydraulic pump cannot be stopped quickly (the machine cannot be stopped immediately). is there.

  For example, in the configuration described in Patent Document 2, when a high-output generator-motor is mounted, even if the engine is stopped by an engine stop switch, the generator-motor operates with electric power stored in the power storage device (engine Assist) may continue. As a result, there is a risk that equipment (for example, a hydraulic pump) driven by the engine and the generator motor cannot be stopped quickly (the operation of the vehicle body cannot be stopped immediately).

  In addition, in the case of the configuration described in Patent Document 2, it is considered that the stop control of the generator motor is performed based on a command from a controller configured by a microcomputer or the like. For this reason, there is a possibility that the engine assist by the generator motor cannot be stopped when the rotational speed of the engine cannot be detected due to a malfunction of the controller or when the deviation between the actual rotational speed and the target rotational speed cannot be calculated. .

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is driven by an engine and a generator motor by operating an engine stop switch even in a configuration equipped with a high-output generator motor. An object of the present invention is to provide a construction machine capable of quickly stopping equipment.

  A construction machine according to the present invention includes a base, an engine mounted on the base, a generator motor driven by the engine, a power storage device connected to the generator motor for storing electric charge, and a plurality of switching elements. An inverter for assist power generation connected to the generator motor, an inverter controller for controlling a rotation speed of the generator motor by outputting a gate signal for controlling opening and closing of a switching element of the inverter for assist power generation, and the engine An engine control controller for controlling the engine and an engine stop switch for stopping the engine.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the engine stop switch is operated by the inverter controller in addition to stopping the engine when operated. The configuration is such that the output gate signal is cut off.

  According to a second aspect of the present invention, the gate signal is interrupted by the engine stop switch regardless of the PWM signal generated by the inverter controller and corresponding to the open / close ratio of the switching element of the assist power generation inverter. It is in that.

  According to a third aspect of the present invention, the inverter controller includes a PWM signal generating unit that generates a PWM signal corresponding to an open / close ratio of a switching element of the assist power generation inverter, and the gate signal based on the PWM signal. A gate signal generating means for outputting to the inverter for assist power generation, and the gate signal generating means has a suppression terminal for stopping the output of the gate signal based on the operation of the engine stop switch. is there.

  According to a fourth aspect of the present invention, the inverter controller includes a PWM signal generating means for generating a PWM signal corresponding to an open / close ratio of a switching element of the assist power generation inverter, and the gate signal based on the PWM signal. Is provided between the PWM signal generating means and the gate signal generating means, and the PWM for the gate signal generating means based on the operation of the engine stop switch. A gate circuit for blocking signal input is provided.

  According to a fifth aspect of the present invention, the inverter controller includes a PWM signal generating means for generating a PWM signal corresponding to an open / close ratio of the switching element of the assist power generation inverter, and the gate signal based on the PWM signal. To the assist power generation inverter, and between the PWM signal generation means and the gate signal generation means, or between the gate signal generation means and the assist power generation inverter. The relay circuit for disconnecting the connection based on the operation of the engine stop switch is provided.

  According to the invention of claim 1, when the engine stop switch is operated, in addition to stopping the engine, the gate signal output from the inverter controller to the assist power generation inverter is cut off. For this reason, a generator motor can be stopped with the stop of an engine based on operation of an engine stop switch. As a result, a hydraulic pump driven by the engine and the generator motor by operating the engine stop switch even in a configuration in which a high-output generator motor is mounted (a configuration in which the high-output generator motor and the engine are connected) The driven device can be stopped quickly.

  According to the invention of claim 2, when the engine stop switch is operated, the gate signal is cut off regardless of the PWM signal generated by the inverter controller. For this reason, even if the PWM signal indicating that the generator motor continues to rotate is generated by the inverter controller, the gate signal is blocked and the generator motor can be stopped reliably.

  According to the invention of claim 3, when the engine stop switch is operated and an engine stop switch signal (stop signal) is output from the engine stop switch, the engine stop switch signal is converted into the gate signal generating means. It is possible to stop the output of the gate signal by the gate signal generating means. Thereby, the output of the gate signal from the gate signal generating means to the assist power generation inverter can be stopped, and the generator motor can be stopped reliably.

  According to the fourth aspect of the present invention, when an engine stop switch signal (stop signal) is output from the engine stop switch by operating the engine stop switch, the engine stop switch signal is input to the gate circuit. Thus, the input of the PWM signal to the gate signal generating means can be cut off. Thereby, the output of the gate signal from the gate signal generating means to the assist power generation inverter can be stopped, and the generator motor can be stopped reliably.

  According to the fifth aspect of the present invention, when an engine stop switch signal (stop signal) is output from the engine stop switch by operating the engine stop switch, the engine stop switch signal is input to the relay circuit. Thus, the input of the PWM signal to the gate signal generating means or the input of the gate signal to the assist power generation inverter can be cut off. Thereby, a generator motor can be stopped reliably.

1 is a front view showing a hydraulic excavator according to a first embodiment. It is a block diagram which shows the structure of the electric system and hydraulic system of a hydraulic shovel. It is a block diagram which expands and shows the electric system in FIG. It is a block diagram which shows the structure of the electric system and hydraulic system of the hydraulic shovel by 2nd Embodiment. FIG. 5 is an enlarged block diagram illustrating a gate circuit and the like in FIG. 4. It is a block diagram which shows the structure of the electric system and hydraulic system of the hydraulic shovel by 3rd Embodiment. It is a block diagram which shows the structure of the electric system and hydraulic system of the hydraulic shovel by 4th Embodiment. It is the same block diagram as FIG. 3 which shows the structure of the electric system by the 1st modification. It is the same block diagram as FIG. 3 which shows the structure of the electric system by the 2nd modification.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example the case of application to a hybrid hydraulic excavator.

  1 to 3 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a hybrid hydraulic excavator as a typical example of a hybrid construction machine. A hybrid hydraulic excavator 1 (hereinafter referred to as a hydraulic excavator 1) includes a self-propelled crawler-type lower traveling body 2, a slewing bearing device 3 provided on the lower traveling body 2, and the slewing bearing device 3. The upper revolving body 4 that is turnably mounted on the lower traveling body 2 and constitutes a vehicle body (base) together with the lower traveling body 2 and the earth and sand excavation work that is attached to the front side of the upper revolving body 4 so as to be able to move up and down. It is comprised including the working device 5 which performs etc.

  The lower traveling body 2 includes a track frame 2A, drive wheels 2B provided on the left and right sides of the track frame 2A, and drive wheels 2B on the left and right sides of the track frame 2A on the opposite side in the front and rear directions. An idler wheel 2C is provided, and a drive wheel 2B and a crawler belt 2D wound around the idler wheel 2C (both are shown only on the left side). The left and right drive wheels 2B are rotationally driven by left and right traveling hydraulic motors 2E and 2F (see FIG. 2), which are hydraulic motors (hydraulic actuators). On the other hand, the slewing bearing device 3 is attached to the upper side of the center portion of the track frame 2A.

  The working device 5 includes a boom 5A attached to the front side of a revolving frame 6 to be described later, an arm 5B attached to the tip of the boom 5A so as to be able to move up and down, and a pivot on the tip of the arm 5B. The bucket 5C is movably mounted, and includes a boom cylinder 5D, an arm cylinder 5E, and a bucket cylinder 5F, each of which includes a hydraulic cylinder (hydraulic actuator) that drives the bucket 5C.

  The upper revolving structure 4 includes a revolving frame 6 that forms a strong support structure. The swivel frame 6 is mounted on the lower traveling body 2 via the swivel bearing device 3 so as to be swivelable. For this purpose, the slewing bearing device 3 is attached to the lower surface side of the slewing frame 6. On the other hand, a cab 7, a counterweight 8, an engine 9, an assist power generation motor 10, a hydraulic pump 11, a power storage device 14, a turning device 15, a power conversion device 19, and the like are provided on the turning frame 6.

  Reference numeral 7 denotes a cab provided on the left front side of the revolving frame 6. A driver's seat on which an operator is seated is provided in the cab 7. Around the driver's seat, a travel operation lever / pedal connected to a control valve 13 described later, a work operation lever, and the like (both not shown) are disposed.

  Reference numeral 8 denotes a counterweight attached to the rear end side of the revolving frame 6. The counterweight 8 balances the weight with the work device 5.

  Reference numeral 9 denotes an engine provided on the revolving frame 6 between the cab 7 and the counterweight 8. The engine 9 is configured using, for example, a diesel engine, and is mounted as an internal combustion engine of the hybrid excavator 1 on the upper swing body 4 in a horizontally placed state extending in the left and right directions. An assist generator motor 10 and a hydraulic pump 11 described later are connected to the output side of the engine 9.

  Here, the engine 9 is composed of an electronically controlled engine. For example, the amount of fuel supplied is variably controlled by a fuel injection device 9A such as an electronically controlled injection valve. That is, the fuel injection device 9A is an injection amount (fuel injection amount) of fuel injected into a cylinder (not shown) of the engine 9 based on a control signal output from an engine control controller (ECU) 28 described later. Is controlled variably. As a result, the engine 9 operates at a rotational speed corresponding to the driving operation of the operator, the operating state of the vehicle, and the like. Further, when an engine stop switch 30 described later is operated, the engine 9 stops the fuel injection of the fuel injection device 9A according to a command from the engine controller 28, and the engine 9 stops.

  Reference numeral 10 denotes an assist generator motor as a generator motor connected to the engine 9. The assist power generation motor 10 is composed of, for example, a permanent magnet type synchronous motor, and generates electric power by being rotationally driven by the engine 9, or assists (assists) driving of the engine 9 by being supplied with electric power. is there. That is, the assist power generation motor 10 assists the drive of the engine 9 by being supplied with power through a function (generator function) for generating power by being rotationally driven by the engine 9 and DC buses 23A and 23B described later. Function (electric motor function).

  The electric power generated by the assist power generation motor 10 is supplied to a second inverter 21 and a chopper 22 to be described later via a first inverter 20 and DC buses 23A and 23B to be described later to drive the swing electric motor 17 and the power storage device 14. Is charged (storage). On the other hand, when assisting the driving of the engine 9, the assist power generation motor 10 is driven by electric power charged in the power storage device 14 (or regenerative electric power of the swing electric motor 17).

  Reference numeral 11 denotes a hydraulic pump (s) that constitutes a hydraulic pressure source together with the hydraulic oil tank 12. The hydraulic pump 11 is constituted by, for example, a swash plate type, an oblique axis type, or a radial piston type hydraulic pump, and is driven by the engine 9 and the assist power generation motor 10. The hydraulic pump 11 drives each hydraulic actuator, that is, the traveling hydraulic motors 2E and 2F of the lower traveling body 2, the boom cylinder 5D, the arm cylinder 5E, the bucket cylinder 5F of the working device 5, and the swing hydraulic motor 16 described later. As a motive power source, the hydraulic oil in the hydraulic oil tank 12 is boosted and discharged toward a control valve 13 described later.

  Reference numeral 13 denotes a control valve provided on the swing frame 6. The control valve 13 includes a plurality of hydraulic control valves that control the hydraulic actuators (specifically, the traveling motors 2E and 2F, the cylinders 5D and 5E and 5F of the working device 5, and the swing hydraulic motor 16). ing. The control valve 13 switches supply and discharge of the pressure oil supplied from the hydraulic pump 11 according to a hydraulic signal or the like based on the operation of the operation lever / pedal for driving or the operation lever for work (discharge amount of pressure oil) And control the discharge direction). Thereby, the hydraulic oil (pressure oil) supplied from the hydraulic pump 11 to the control valve 13 is appropriately distributed to the respective hydraulic actuators 2E, 2F, 5D, 5E, 5F, 16 and these hydraulic actuators 2E, 2F, 5D, 5E, 5F, 16 can be driven (expanded, reduced, rotated).

  Reference numeral 14 denotes a power storage device provided on the revolving frame 6. The power storage device 14 is connected to the assist power generation motor 10 and the swing electric motor 17 via a chopper 22, a first inverter 20, and a second inverter 21 described later. The power storage device 14 is configured using, for example, an electric double layer capacitor and stores electric charges. That is, the power storage device 14 charges (accumulates) the power generated by the assist power generation motor 10 and the power generation (regenerative power) generated during the turn deceleration by the swing electric motor 17, or the charged power is transferred to the assist power generation motor 10 and the turn. The electric motor 17 is discharged (powered). For example, a battery such as a lithium ion battery can be used as the power storage device 14 in addition to the capacitor.

  Reference numeral 15 denotes a turning device provided on the upper turning body 4 (the turning frame 6). The turning device 15 is configured to turn the upper turning body 4 relative to the lower traveling body 2 by transmitting a rotational force to the turning bearing device 3. Here, the turning device 15 is configured as a so-called hybrid turning device in which the turning hydraulic motor 16 and the turning electric motor 17 cooperate to drive the upper turning body 4 to turn. For this purpose, the turning device 15 includes a turning hydraulic motor 16 constituted by a hydraulic actuator such as a swash plate type hydraulic motor, a turning electric motor 17 as a turning electric motor constituted by an electric actuator such as an electric motor, and a turning hydraulic pressure. A speed reduction mechanism 18 that decelerates the rotation input from the motor 16 and / or the swing electric motor 17, and an output as a pinion that outputs the rotation decelerated by the speed reduction mechanism 18 to the swing bearing device 3 (inner teeth of the inner ring). And a shaft (not shown).

  Here, the swing electric motor 17 rotates the upper swing body 4 in cooperation with the swing hydraulic motor 16. The swing electric motor 17 is configured by using, for example, a permanent magnet type synchronous motor, and is driven by power generated by the assist power generation motor 10 and power of the power storage device 14. Further, the turning electric motor 17 generates electric power by converting energy generated when the turning operation is decelerated into electric energy. That is, the turning electric motor 17 has a function (electric motor function) for turning the upper turning body 4 by being supplied with electric power via DC buses 23A and 23B, which will be described later, and a kinetic energy of the upper turning body 4 at the time of turning deceleration ( It has a function (generator function) for converting (rotational energy) into electric energy (regenerative power generation). The generated electric power (regenerative electric power) of the swing electric motor 17 is supplied to the first inverter 20 and the chopper 22 which will be described later via the second inverter 21 and the DC buses 23A and 23B which will be described later. Then, the power storage device 14 is charged (power storage).

  Next, the configuration of the electric system of the hybrid excavator 1 will be described.

  As shown in FIGS. 2 and 3, the electric system of the excavator 1 includes a first inverter 20 and a second inverter 21 described later in addition to the assist power generation motor 10, the power storage device 14, and the swing electric motor 17 described above. , Chopper 22, inverter controller 24, chopper controller 25, integrated controller 26, and the like. In this case, for example, the first inverter 20, the second inverter 21, the chopper 22, the inverter controller 24, and the chopper controller 25 are combined (unitized) as a power converter (PCU: power control unit) 19. It is mounted on the upper swing body 4.

  Reference numeral 20 denotes a first inverter as an assist power generation inverter (assist power generation switching device) electrically connected to the assist power generation motor 10. The first inverter 20 controls the driving of the assist power generation motor 10. Specifically, the first inverter 20 is configured by using a plurality of (for example, six) switching elements made of, for example, transistors, insulated gate bipolar transistors (IGBTs), etc., and a pair of DC buses 23A and 23B, which will be described later. It is connected. Opening and closing of the switching element of the first inverter 20 is controlled by an inverter controller 24 described later. During power generation by the assist power generation motor 10, the first inverter 20 converts the power generated by the assist power generation motor 10 into DC power and supplies it to the DC buses 23A and 23B. On the other hand, when the assist generator motor 10 is driven, the first inverter 20 generates three-phase (U-phase, V-phase, W-phase) AC power from the DC power of the DC buses 23A, 23B, and the assist generator motor 10 To supply.

  Reference numeral 21 denotes a second inverter as a turning inverter (turning switching device) electrically connected to the turning electric motor 17. The second inverter 21 controls the driving of the swing electric motor 17. Specifically, the second inverter 21 is configured by using a plurality of (for example, six) switching elements in substantially the same manner as the first inverter 20, and is connected to a pair of DC buses 23A and 23B described later. Yes. Opening and closing of the switching element of the second inverter 21 is controlled by an inverter controller 24 described later. During the turning drive of the swing electric motor 17, the second inverter 21 generates three-phase (U-phase, V-phase, W-phase) AC power from the DC power of the DC buses 23 </ b> A and 23 </ b> B and supplies it to the swing electric motor 17. To do. On the other hand, when the swing electric motor 17 is decelerated (regeneration), the second inverter 21 converts the regenerative power generated by the swing electric motor 17 into DC power and supplies it to the DC buses 23A and 23B.

  Reference numeral 22 denotes a chopper having one end connected to the power storage device 14 and the other end connected to a pair of DC buses 23A and 23B. The chopper 22 and the inverters 20 and 21 are electrically connected to each other via a pair of DC buses 23A and 23B. The chopper 22 includes a plurality of (for example, two) switching elements made of, for example, an IGBT and a reactor. The chopper 22 is controlled to be opened and closed by a chopper controller 25 described later. When the power storage device 14 is charged, the chopper 22 functions as a step-down circuit (step-down chopper), for example, steps down a DC voltage supplied from the DC buses 23A and 23B and supplies the voltage to the power storage device 14. On the other hand, when the power storage device 14 is discharged, the chopper 22 functions as a booster circuit (boost chopper), boosts the DC voltage supplied from the power storage device 14 and supplies the boosted DC voltage to the DC buses 23A and 23B.

  The inverters 20 and 21 and the chopper 22 are connected to each other through a pair of DC buses 23A and 23B on the positive electrode side (plus side) and the negative electrode side (minus side). A smoothing capacitor C is connected to the DC buses 23A and 23B in order to stabilize the voltage of the DC buses 23A and 23B. For example, a predetermined DC voltage of about several hundred volts is applied to the DC buses 23A and 23B.

  Reference numeral 24 denotes an inverter controller as a controller (control device) for controlling the inverters 20 and 21. The inverter controller 24 is composed of, for example, a microcomputer, and uses various signals such as operation command signals to control commands for the first inverter 20 and the second inverter 21 (for example, the inverters 20 and 21). A gate signal for controlling opening and closing of the switching element), and driving control (rotational speed control) of the motors 10 and 17 is performed. The configuration of the inverter controller 24 will be described in detail later.

  Reference numeral 25 denotes a chopper control controller as a controller (control device) for controlling the chopper 22. The chopper controller 25 is composed of, for example, a microcomputer and generates a control command (for example, a gate signal for controlling opening / closing of the switching element) to the chopper 22 using various signals such as an operation command signal. Then, control is performed such that the voltages of the DC buses 23A and 23B are held near a predetermined constant value.

  The inverter controller 24 and the chopper controller 25 are electrically connected to an integrated controller (main control unit) 26 including a malfunction monitoring / strange processing control unit 26A, an energy management control unit 26B, etc. via a communication line 27. Are connected to each other to form a CAN (Control Area Network). The integrated controller 26 is also composed of a microcomputer or the like, generates control commands for the inverter controller 24, the chopper controller 25, and the like, controls the driving of the assist power generation motor 10, the swing electric motor 17, the malfunction monitoring of the electric system, and energy management. Etc. are controlled.

  For example, the malfunction monitoring / malfunction processing control unit 26A controls malfunction monitoring of the electric system. Specifically, the malfunction monitoring / synchronization processing control unit 26A has experienced malfunctions, abnormalities, warnings, etc. in the electric system such as the power conversion device 19, the assist power generation motor 10, the swing electric motor 17, and the power storage device 14. If it is determined that a malfunction has occurred, an electric system malfunction signal (a malfunction report signal) that is a signal to that effect is output to the inverter controller 24 (or gate 24D) or the like. To do. In the energy management control unit 26B, for example, the power storage command of the power storage device 14 that increases or decreases depending on the difference between the energy consumed by the swing electric motor 17 during acceleration and the energy regenerated during deceleration is supplied to the assist power generation motor 10 as a power generation command or an assist command. The output is controlled to keep within a predetermined range.

  The integrated controller 26 is electrically connected to an engine control controller 28 called an ECU (engine control unit) via a communication line 29. The engine controller 28 controls the engine 9 (rotational speed control or the like), and is connected to, for example, a fuel injection device 9A of the engine 9. The engine controller 28 variably controls the fuel injection amount (fuel supply amount) by the fuel injection device 9A into the cylinder of the engine 9 so that the engine controller 28 can rotate at a rotational speed corresponding to the driving operation of the operator, the operating state of the vehicle, and the like. The engine 9 is operated. In this case, the engine controller 28 controls the fuel injection amount of the fuel injection device 9A based on, for example, a command from an engine speed instruction dial (not shown) operated by an operator, a command from the integrated controller 26, and the like. Do.

  Reference numeral 30 denotes an engine stop switch for stopping the engine 9. The engine stop switch 30 is connected to the engine controller 28 and the inverter controller 24 (or the gate 24D). In the case of the first embodiment, the engine stop switch 30 is configured to shut off the gate signal output from the inverter controller 24 in addition to stopping the engine 9 when operated. In this case, the gate signal is cut off by the engine stop switch 30 regardless of the PWM signal generated by the inverter controller 24 (a signal corresponding to the switching element open / close ratio). That is, the gate signal is cut off by the engine stop switch 30 regardless of the PWM signal for the first inverter 20 and the PWM signal for the second inverter 21 generated by the inverter controller 24.

  Here, the inverter controller 24 outputs a gate signal for opening and closing the switching element of the first inverter 20 and the switching element of the second inverter 21 to control the assist power generation motor 10 and the swing electric motor 17 ( For example, the rotational speed is controlled). For this purpose, the inverter controller 24 includes a PWM signal generation circuit 24A as PWM signal generation means for generating a PWM signal for the switching element of the first inverter 20 and a PWM signal for the switching element of the second inverter 21, and a PWM signal. A first gate signal generation IC 24B as gate signal generation means for outputting a gate signal to the first inverter 20 based on the PWM signal generated by the signal generation circuit 24A, and a PWM signal generated by the PWM signal generation circuit 24A And a second gate signal generation IC 24C as a gate signal generation means for outputting a gate signal to the second inverter 21.

  The inverter controller 24 is provided with an OR gate 24D. The OR gate 24D generates a first gate signal when an at least one of an engine stop switch signal (signal indicating stop), which will be described later, and an electric system malfunction signal (signal indicating malfunction) are input. This is for outputting a signal to stop the output of the gate signal to the IC 24B and the second gate signal generation IC 24C.

  The inverter controller 24 receives a torque command, a power generation command or an assist command from the integrated controller 26, and outputs a three-phase PWM signal from the PWM signal generation circuit 24A according to the command. Each of the gate signal generation ICs 24B and 24C is based on the three-phase PWM signal output from the PWM signal generation circuit 24A (the PWM signal corresponding to the open / close ratio of each switching element). Gate signals are output to the upper and lower arms of each phase and to the upper and lower arms of the three phases of the second inverter 21, respectively. Thereby, the switching element in the 1st inverter 20 and the switching element in the 2nd inverter 21 open and close based on each gate signal, and a three-phase alternating current is produced | generated. As a result, the assist power generation motor 10 and the swing electric motor 17 are driven with the commanded torque.

  On the other hand, when the engine stop switch 30 is operated (ON: operation to the engine stop side), an engine stop switch signal (a signal indicating the stop) is output from the engine stop switch 30, and the engine stop switch signal is output from the engine control controller. 28. When an engine stop switch signal (stop signal) is input from the engine stop switch 30, the engine controller 28 outputs a signal for stopping fuel injection to the fuel injection device 9A of the engine 9. Thereby, the fuel injection of the fuel injection device 9A is stopped, and the engine 9 is stopped.

  Further, the engine stop switch signal (signal indicating that the engine has been stopped) output from the engine stop switch 30 is input not only to the engine controller 28 but also to the inverter controller 24 (or the gate 24D). As will be described later, when the engine stop switch signal (stop signal) is input from the engine stop switch 30, the inverter controller 24 receives the first inverter 20 and the second inverter from the gate signal generation ICs 24B and 24C. The gate signal output to the inverter 21 is cut off and the electric system is stopped.

  Further, as described above, the inverter control controller 24 (or the gate 24D thereof) also receives an electric system malfunction signal (signal indicating malfunction) from the integrated controller 26. That is, the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 outputs an electric system malfunction signal, which is a signal to that effect, when the malfunction condition, abnormality, warning, or the like occurs in the electric system. (Or OR gate 24D). In addition, the energy management control unit 26B of the integrated controller 26 generates an electric system malfunction signal (for example, malfunction monitoring / stabilization) that becomes a signal to that effect when the amount of power stored in the power storage device 14 falls outside a predetermined range. Output to the inverter controller 24 (or the OR gate 24D thereof) via the processing control unit 26A.

  As will be described later, the inverter controller 24 also receives the first inverter 20 and the second inverter from the gate signal generation ICs 24B and 24C even when the electric system malfunction signal (signal indicating malfunction) is input from the integrated controller 26. The gate signal output to the inverter 21 is cut off and the electric system is stopped. That is, in the first embodiment, the inverter controller 24 is configured such that the engine stop switch signal from the engine stop switch 30 (stop signal) and the electric system malfunction signal from the integrated controller 26 (malfunction signal). When at least one of the signals is input, the gate signals output from the gate signal generation ICs 24B and 24C to the first inverter 20 and the second inverter 21 are cut off, and the electric system is stopped.

  Next, a configuration for blocking the gate signals output from the gate signal generation ICs 24B and 24C will be described.

  The gate signal generation ICs 24B and 24C of the inverter controller 24 are the inhibition terminals (inhibit terminals) 24B1 and 24C1 that stop the output of the gate signal based on the operation of the engine stop switch 30 and / or the command from the integrated controller 26. It has. An engine stop switch signal from the engine stop switch 30 and an electric system malfunction signal from the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are selectively input to the inhibition terminals 24B1 and 24C1. For this purpose, the inverter controller 24 includes a two-input OR gate 24D.

  One input side of the OR gate 24 </ b> D is connected to the engine stop switch 30, and the other input side is connected to the malfunction monitoring / malfunction processing control unit 26 </ b> A of the integrated controller 26. On the other hand, the output side of the OR gate 24D is connected to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C. Here, the engine stop switch signal is inverted and input to one input side of the OR gate 24D, and the electric system malfunction signal is inverted and input to the other input side of the OR gate 24D. The calculated output is inverted and output. In other words, it is configured as an inverting input NOR gate.

  The engine stop switch 30 outputs 1 when it is not operated (OFF), and outputs 0 when it is operated (turned ON) by an operator or the like to stop the engine 9. The malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 outputs 1 when normal, and outputs 0 when determined to be malfunctioning.

  When at least one of the engine stop switch signal and the electric system malfunction signal is switched from 1 to 0, the OR gate 24D changes its output (inverted output) from the high level (1) to the low level (0). (The output becomes low level). The output (inverted output) of the OR gate 24D is input to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C. In this case, when the signal level of the inhibition terminals 24B1 and 24C1 changes from the high level (1) to the low level (0), the gate signal generation ICs 24B and 24C generate the gate signals to the first inverter 20 and the second inverter 21. Stop output. As a result, when the engine stop switch 30 is operated and / or when the integrated controller 26 determines that the malfunction has occurred, the gate signal output to the first inverter 20 and the second inverter 21 may be cut off. The assist power generation motor 10 and the swing electric motor 17 can be stopped.

  In the first embodiment, the engine stop switch 30 and the integrated controller 26 (the malfunction monitoring / malfunction processing control unit 26A) are directly connected to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C via the OR gate 24D. Has been. Therefore, based on the electrical signals (engine stop switch signal, electric system malfunction signal) output from the engine stop switch 30 and / or the integrated controller 26 without using the software installed in the inverter controller 24. The gate signal output from the gate signal generation ICs 24B and 24C can be stopped. As a result, even if the integrated controller 26 or the inverter controller 24 malfunctions, the operation of the engine stop switch 30 stops the output of the gate signal to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C through the OR gate 24D. Signal is input. As a result, the assist power generation motor 10 and the swing electric motor 17 can be quickly stopped together with the stop of the engine 9.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the operator gets on the cab 7 and sits on the driver's seat. By operating the operation lever / pedal for traveling in this state, pressure oil is supplied from the control valve 13 to the traveling motors 2E and 2F of the lower traveling body 2, and the left and right drive wheels 2B are driven to hydraulic pressure. The shovel 1 can be moved forward or backward. The operator seated in the driver's seat can perform earth excavation work by turning the upper swing body 4 or moving the working device 5 up and down by operating the operation lever. .

  Here, for example, when an operator or the like operates the engine stop switch 30 during maintenance or emergency stop of the hydraulic excavator 1, an engine stop switch signal (a signal indicating stop) is sent from the engine stop switch 30 to the engine control controller 28. It is input to the inverter controller 24 (or its gate 24D). Thereby, the fuel injection from the fuel injection device 9A of the engine 9 is stopped, and the engine 9 is stopped. In addition to this, the output of the gate signals from the gate signal generation ICs 24B and 24C of the inverter controller 24 is stopped, and the assist power generation motor 10 and the swing electric motor 17 are also stopped.

  As described above, in the first embodiment, when the engine stop switch 30 is operated, in addition to stopping the engine 9, the inverter controller 24 outputs to the first inverter 20 and the second inverter 21. Interrupts the gate signal. Therefore, the assist power generation motor 10 and the swing electric motor 17 can be stopped together with the stop of the engine 9 based on the operation of the engine stop switch 30. Thus, even in a configuration in which the high-power assist power generation motor 10 is mounted (a configuration in which the high-power assist power generation motor 10 and the engine 9 are connected), the engine stop switch 30 is operated to operate the engine 9 and the assist power generation. The hydraulic pump 11 driven by the motor 10 can be quickly stopped. In addition to this, the turning electric motor 17 can also be stopped, and the turning device 15 can be quickly stopped. As a result, the excavator 1 can be stopped immediately.

  According to the first embodiment, when the engine stop switch 30 is operated, the gate signal is cut off regardless of the PWM signal generated by the inverter controller 24. That is, even if the PWM signal is generated by the PWM signal generation circuit 24A of the inverter controller 24 based on the command of the integrated controller 26, etc., it is based on the electrical signal (engine stop switch signal) output from the engine stop switch 30. The gate signal output from the gate signal generation ICs 24B and 24C is stopped. For this reason, even if the inverter controller 24 generates a PWM signal indicating that the assist generator motor 10 and the swing electric motor 17 continue to rotate, the gate signal is blocked, and the assist generator motor 10 and the swing electric motor 17 are It can be stopped reliably.

  According to the first embodiment, when the engine stop switch 30 is operated to output an engine stop switch signal (a signal indicating the stop) from the engine stop switch 30, the engine stop switch signal is It is directly input to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C (via the OR gate 24D), and the gate signal output by the gate signal generation ICs 24B and 24C can be stopped. Thereby, the gate signal output from the gate signal generation ICs 24B and 24C to the first inverter 20 and the second inverter 21 can be stopped, and the assist power generation motor 10 and the swing electric motor 17 can be stopped reliably. .

  Next, FIG. 4 and FIG. 5 show a second embodiment of the present invention. A feature of the second embodiment resides in that a gate circuit for cutting off the PWM signal is provided between the PWM signal generating means and the gate signal generating means. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  4 and 5, reference numeral 31 denotes an inverter controller used in the second embodiment in place of the inverter controller 24 in the first embodiment. The inverter controller 31 sends a gate signal to the first inverter 20 based on the PWM signal generation circuit 31A similar to the PWM signal generation circuit 24A of the first embodiment and the PWM signal generated by the PWM signal generation circuit 31A. The first gate signal generation IC 31B as the gate signal generation means for outputting the signal and the second gate signal generation means as the gate signal generation means for outputting the gate signal to the second inverter 21 based on the PWM signal generated by the PWM signal generation circuit 31A 2 gate signal generation IC 31C and a gate circuit 32 described later. The inverter controller 31 is provided with an OR gate 31D which is different from the OR gate 24D of the first embodiment in that it is not connected to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C. In this case, the OR gate 31D is connected to the gate circuit 32.

  Reference numeral 32 denotes a gate circuit provided between the PWM signal generation circuit 31A and each of the gate signal generation ICs 31B and 31C. The gate circuit 32 blocks the input of PWM signals to the gate signal generation ICs 31B and 31C based on the operation of the engine stop switch 30. Here, the engine stop switch signal from the engine stop switch 30 and the electric system malfunction signal from the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are selectively input to the gate circuit 32. Therefore, the input side of the gate circuit 32 is connected to the output side of the OR gate 31D, and the output of the OR gate 31D is input to the gate circuit 32.

  Here, a specific configuration of the gate circuit 32 will be described with reference to FIG.

  Six PWM signals are input from the PWM signal generation circuit 31A to the gate circuit 32, and the gate circuit 32 includes six 2-input AND gates 32A and 32B. Since the six AND gates 32A and 32B have the same configuration, in FIG. 5, two AND gates, one AND gate 32A for the assist power generation motor and one AND gate 32B for the swing electric motor. 32A and 32B are shown. In the gate circuit 32, one input side of the AND gates 32A and 32B is connected to the PWM signal generation circuit 31A. That is, one PWM signal is input to one input side of the AND gates 32A and 32B. On the other hand, the other input side of the AND gates 32A and 32B is connected to the output side of the OR gate 31D. That is, the output (inverted output) of the OR gate 31D is input to the other input side of the AND gates 32A and 32B.

  Here, the engine stop switch 30 outputs 1 when not operated (OFF), and outputs 0 when operated by an operator or the like to stop the engine 9 (turned ON). The malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 outputs 1 when normal, and outputs 0 when determined to be malfunctioning. Accordingly, when at least one of the engine stop switch signal and the electric system malfunction signal is switched from 1 to 0, the output (inverted output) of the OR gate 31D changes from the high level (1) to the low level (0). ) And one input of the AND gates 32A and 32B is turned OFF (0). As a result, the PWM signal input to the gate signal generation ICs 31B and 31C from the PWM signal generation circuit 31A is cut off, and the output of the gate signals of the gate signal generation ICs 31B and 31C is stopped. As a result, the assist power generation motor 10 and the swing electric motor 17 can be stopped.

  In the second embodiment, an electrical signal (engine stop switch signal, electric system malfunction) output from the engine stop switch 30 and / or the integrated controller 26 without using software installed in the inverter controller 31. Signal), the gate circuit 32 can prevent the PWM signal generated by the PWM signal generation circuit 31A from being input to the gate signal generation ICs 31B and 31C. As a result, even if the integrated controller 26 or the inverter control controller 31 malfunctions, the operation of the engine stop switch 30 causes the AND gates 32A and 32B of the gate circuit 32 to be connected to the gate signal generation ICs 31B and 31C via the OR gate 31D. A signal for stopping the input of the PWM signal is input. As a result, the assist power generation motor 10 and the swing electric motor 17 can be quickly stopped together with the stop of the engine 9.

  The second embodiment is configured to block the PWM signal using the gate circuit 32 as described above, and the basic operation is not particularly different from that according to the first embodiment described above. .

  In particular, in the second embodiment, when an engine stop switch signal (a signal indicating a stop) is output from the engine stop switch 30 by operating the engine stop switch 30, the engine stop switch signal is The input of the PWM signal to the gate signal generation ICs 31B and 31C can be cut off by being input to the gate circuit 32 (and the AND gates 32A and 32B thereof) via the OR gate 24D. Thereby, it is possible to stop the output of gate signals from the gate signal generation ICs 31B and 31C to the first inverter 20 and the second inverter 21, and to reliably stop the assist power generation motor 10 and the swing electric motor 17. it can.

  Next, FIG. 6 shows a third embodiment of the present invention. A feature of the third embodiment resides in that an OR gate is provided in a controller (integrated controller) different from the inverter controller and an engine stop switch is connected to the OR gate of the other controller. Note that in the third embodiment, the same components as those in the first embodiment and the second embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 6, reference numeral 41 denotes an inverter controller used in the third embodiment in place of the inverter controller 24 in the first embodiment. The inverter controller 41 includes a PWM signal generation circuit 41A similar to the PWM signal generation circuit 24A of the first embodiment, and inhibition terminals 41B1 and 41C1 similar to the gate signal generation ICs 24B and 24C of the first embodiment. The gate signal generating ICs 41B and 41C having The third embodiment is different from the inverter controller 24 of the first embodiment in that the inverter controller 41 does not have an OR gate (the inverter controller 41 does not have an OR gate).

  Reference numeral 42 denotes an integrated controller used in the third embodiment in place of the integrated controller 26 of the first embodiment. The integrated controller 42 includes the same malfunction monitoring / malfunction processing control unit 42A as in the first embodiment and an energy management control unit 42B similar to that in the first embodiment. The integrated controller 42 is provided with an OR gate 43 described later. In the third embodiment, the engine stop switch 30 is connected to the integrated controller 42 (or the gate 43 thereof) with the configuration in which the integrated controller 42 has the OR gate 43 (the OR gate 43 is provided in the integrated controller 42). Has been.

  43 is an OR gate to which the engine stop switch signal from the engine stop switch 30 and the electric system malfunction signal from the malfunction monitoring / malfunction processing control unit 42A of the integrated controller 42 are input. As with the OR gate 24D of the first embodiment, the OR gate 43 receives at least one of an engine stop switch signal (stop signal) and an electric system malfunction signal (malfunction signal). Then, a signal to stop the output of the gate signal is output to each of the gate signal generation ICs 41B and 41C.

  One input side of the OR gate 43 is connected to the engine stop switch 30, and the other input side is connected to the malfunction monitoring / malfunction processing control unit 42 </ b> A of the integrated controller 42. On the other hand, the output side of the OR gate 43 is connected to the inhibition terminals 41B1 and 41C1 of the gate signal generation ICs 41B and 41C. Here, the engine stop switch signal is inverted and input to one input side of the OR gate 43, and the electric system malfunction signal is inverted and input to the other input side of the OR gate 43. The calculated output is inverted and output. In other words, it is configured as an inverting input NOR gate.

  The engine stop switch 30 outputs 1 when it is not operated (OFF), and outputs 0 when it is operated (turned ON) by an operator or the like to stop the engine 9. The malfunction monitoring / malfunction processing control unit 42A of the integrated controller 42 outputs 1 when normal, and outputs 0 when determined to be malfunctioning.

  When at least one of the engine stop switch signal and the electric system malfunction signal is switched from 1 to 0, the OR gate 43 changes its output (inverted output) from the high level (1) to the low level (0). (The output becomes low level). The output of the OR gate 43 (inverted output) is input to the inhibition terminals 41B1 and 41C1 of the gate signal generation ICs 41B and 41C. In this case, when the signal level of the inhibition terminals 41B1 and 41C1 changes from the high level (1) to the low level (0), the gate signal generation ICs 41B and 41C generate the gate signals to the first inverter 20 and the second inverter 21. Stop output. Thereby, the gate signal output to the 1st inverter 20 and the 2nd inverter 21 can be interrupted | blocked, and the assist electric power generation motor 10 and the turning electric motor 17 can be stopped.

  Also in the third embodiment, an electrical signal (engine stop switch signal, electric system malfunction) output from the engine stop switch 30 and / or the integrated controller 42 without using software installed in the inverter controller 41. Signal) from the gate signal generation ICs 41B and 41C can be stopped. As a result, even if a malfunction occurs in the integrated controller 42 or the inverter control controller 41, the operation of the engine stop switch 30 stops the output of the gate signal to the inhibition terminals 41B1 and 41C1 of the gate signal generation ICs 41B and 41C through the OR gate 43. Signal is input. As a result, the assist power generation motor 10 and the swing electric motor 17 can be quickly stopped together with the stop of the engine 9.

  The third embodiment is configured to block the gate signal via the OR gate 43 as described above, and there is no particular difference in the basic operation from that according to the first embodiment described above.

  In particular, in the third embodiment, the engine stop switch 30 can be connected to the OR gate 43 of the integrated controller 42. Thereby, the freedom degree of the wiring of the engine stop switch 30 can be improved.

  In the third embodiment, the case where the output of the OR gate 43 is input to the inhibition terminals 41B1 and 41C1 of the gate signal generation ICs 41B and 41C has been described as an example. However, the present invention is not limited to this, and, as indicated by a broken line in FIG. 6, between the PWM signal generation circuit 41A and each of the gate signal generation ICs 41B and 41C, secondly, the gate circuit 32 of the embodiment. A similar gate circuit 51 may be provided, and the output of the OR gate 43 may be input to an AND gate (not shown) of the gate circuit 51.

  Next, FIG. 7 shows a fourth embodiment of the present invention. A feature of the fourth embodiment resides in that a relay circuit is provided between the gate signal generating means and the assist power generation inverter. Note that in the fourth embodiment, the same components as those in the first to third embodiments described above are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 61 denotes an inverter controller used in the fourth embodiment in place of the inverter controller 24 in the first embodiment. The inverter controller 61 sends a gate signal to the first inverter 20 based on the PWM signal generation circuit 61A similar to the PWM signal generation circuit 24A of the first embodiment and the PWM signal generated by the PWM signal generation circuit 61A. The first gate signal generation IC 61B as the gate signal generation means for outputting the signal and the second gate signal generation means as the gate signal generation means for outputting the gate signal to the second inverter 21 based on the PWM signal generated by the PWM signal generation circuit 61A 2 gate signal generation IC 61C. The inverter controller 61 is provided with an OR gate 61D which is different from the OR gate 24D of the first embodiment in that it is not connected to the inhibition terminals 24B1 and 24C1 of the gate signal generation ICs 24B and 24C. In this case, the OR gate 61D is connected to a relay circuit 62 described later.

  Reference numeral 62 denotes a relay circuit provided between each of the gate signal generation ICs 61B and 61C and the first inverter 20 and the second inverter 21. The relay circuit 62 disconnects the connection between the gate signal generation ICs 61 </ b> B and 61 </ b> C and the first inverter 20 and the second inverter 21 based on the operation of the engine stop switch 30. Here, the engine stop switch signal from the engine stop switch 30 and the electric system malfunction signal from the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are selectively input to the relay circuit 62. For this reason, the input side of the relay circuit 62 is connected to the output side of the OR gate 61D, and the output of the OR gate 61D is input to the relay circuit 62.

  Here, the engine stop switch 30 outputs 1 when not operated (OFF), and outputs 0 when operated by an operator or the like to stop the engine 9 (turned ON). The malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 outputs 1 when normal, and outputs 0 when determined to be malfunctioning. Accordingly, when at least one of the engine stop switch signal and the electric system malfunction signal is switched from 1 to 0, the output (inverted output) of the OR gate 61D changes from the high level (1) to the low level (0). ) And output to the relay circuit 62. At this time, in the relay circuit 62, the relay is activated as the input changes from the high level (1) to the low level (0), and the gate signal generation ICs 61B and 61C, the first inverter 20 and the second inverter are operated. The connection with 21 is interrupted. Thereby, the gate signal output from each gate signal generation IC61B and 61C is no longer input into the 1st inverter 20 and the 2nd inverter 21, and the assist electric power generation motor 10 and the turning electric motor 17 stop.

  Also in the fourth embodiment, an electrical signal (engine stop switch signal, electric system malfunction) output from the engine stop switch 30 and / or the integrated controller 26 without using software installed in the inverter controller 61. Signal) can be prevented from being input to the first inverter 20 and the second inverter 21 from the gate signal generation ICs 61B and 61C. As a result, even if a malfunction occurs in the integrated controller 26 or the inverter controller 61, the gates for the first inverter 20 and the second inverter 21 are connected to the relay circuit 62 via the OR gate 61D by the operation of the engine stop switch 30. A signal for stopping signal input is input. As a result, the assist power generation motor 10 and the swing electric motor 17 can be quickly stopped together with the stop of the engine 9.

  The fourth embodiment is configured such that the gate signal is cut off using the relay circuit 62 as described above, and the basic operation is not particularly different from that according to the first embodiment described above. .

  In particular, in the fourth embodiment, when an engine stop switch signal (a signal indicating a stop) is output from the engine stop switch 30 by operating the engine stop switch 30, the engine stop switch signal is The gate signal input to the first inverter 20 and the second inverter 21 can be cut off by being input to the relay circuit 62 (through the OR gate 61D). Thereby, the assist electric power generation motor 10 and the turning electric motor 17 can be stopped reliably.

  In the first embodiment described above, the configuration in which the engine stop switch 30 and the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are connected to the OR gate 24D, more specifically, one input of the OR gate 24D. The engine stop switch signal is inverted and input to the side, the electric system malfunction signal is inverted and input to the other input side of the OR gate 24D, and the OR operation output is inverted and output from the OR gate 24D. In the case described above (when configured as a NOR gate with inverting input), an example has been described. However, the present invention is not limited to this, and the engine stop switch 30 and the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are connected to the AND gate 71 as in the first modification shown in FIG. It is good also as a structure. The same applies to the second embodiment, the third embodiment, and the fourth embodiment.

  In the second embodiment described above, the engine stop switch 30 and the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 are connected to the OR gate 31D, and the OR gate 31D is connected to the AND gates 32A and 32B of the gate circuit 32. The case where it was set as the example demonstrated and demonstrated. However, the present invention is not limited to this. For example, an OR gate may be omitted as in the second modification shown in FIG. That is, the engine stop switch 30 and the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26 may be connected to the AND gates 81A, 81B, 81C, 81D constituting the gate circuit 81, respectively. In other words, the AND gates 81A and 81B connected to the engine stop switch 30, and the AND gates 81C and 81D connected to the malfunction monitoring / malfunction processing control unit 26A of the integrated controller 26, the PWM signal generation circuit 31A, and each The gate signal generation ICs 31B and 31C may be provided in series. The same applies to the third embodiment.

  In the above-described fourth embodiment, the case where the relay circuit 62 is provided between the gate signal generation ICs 61B and 61C and the first inverter 20 and the second inverter 21 has been described as an example. However, the present invention is not limited to this. For example, a relay circuit may be provided between the PWM signal generation circuit (PWM signal generation means) and the gate signal generation IC (gate signal generation means).

  In the fourth embodiment described above, the inverter controller 61 is provided in the OR gate 61D (the inverter controller 61 has the OR gate 61D), as in the first and second embodiments. The case has been described as an example. However, the present invention is not limited to this. For example, as in the third embodiment, an engine stop switch is provided in a part other than the inverter controller, such as a controller (for example, an integrated controller) different from the inverter controller It is also possible to provide an OR gate connected to The same applies to the first embodiment and the second embodiment. Further, regarding the first modified example, the AND gate 71 connected to the engine stop switch 30 may be provided in a part (for example, the integrated controller 26) different from the inverter controller 24.

  In each of the above-described embodiments and modifications, of the engine stop switch signal (stop signal) from the engine stop switch 30 and the electric system malfunction signal (malfunction signal) from the integrated controller 26. The case has been described as an example in which the gate signal output from the inverter controller 24, 31, 41, 61 is cut off based on at least one of the signals. However, the present invention is not limited to this. For example, the gate signal output from the inverter controller may be blocked based only on the engine stop switch signal (stop signal). On the other hand, at least one of an engine stop switch signal (signal indicating that the engine is stopped), an electric system malfunction signal (signal indicating that the engine is malfunctioning), and another signal that should stop other generator motors. The gate signal output from the inverter controller may be blocked based on the above.

  In each of the above-described embodiments and modifications, the assist generator motor 10 and the swing electric motor 17 are based on the engine stop switch signal from the engine stop switch 30 (and / or the electric system malfunction signal from the integrated controller 26). As an example, a case in which both are stopped is described. However, the present invention is not limited to this, and for example, only the assist generator motor (generator motor) may be stopped based on an engine stop switch signal (and / or a signal from the controller) from the engine stop switch. .

  In each of the above-described embodiments and modifications, the case where the turning device 15 is a hybrid type turning device constituted by the turning hydraulic motor 16 and the turning electric motor 17 has been described as an example. However, the present invention is not limited to this. For example, the turning device may be an electric turning device (without a hydraulic motor) configured by a turning electric motor (electric motor) alone.

  In the embodiment described above, the hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to hybrid construction machines including various work vehicles, work machines, and the like such as wheel loaders, hydraulic cranes, forklifts, and the like.

1 Excavator (construction machine)
2 Lower traveling body (base)
4 Upper swing body (base)
9 Engine 10 Assist generator motor (generator motor)
14 Power Storage Device 20 First Inverter (Assist Power Generation Inverter)
24, 31, 41, 61 Inverter controller 24A, 31A, 41A, 61A PWM signal generation circuit (PWM signal generation means)
24B, 31B, 41B, 61B First gate signal generation IC (gate signal generation means)
24C, 31C, 41C, 61C Second gate signal generation IC (gate signal generation means)
24B1, 24C1, 41B1, 41C1 Inhibition terminal 28 Engine controller 30 Engine stop switch 32, 51, 81 Gate circuit 62 Relay circuit

Claims (5)

A base, an engine mounted on the base, a generator motor driven by the engine, a power storage device connected to the generator motor for storing electric charge, and a plurality of switching elements, and connected to the generator motor An inverter for assist power generation, an inverter controller for controlling the number of revolutions of the generator motor by outputting a gate signal for controlling opening and closing of the switching element of the inverter for assist power generation, and an engine controller for controlling the engine In a construction machine comprising an engine stop switch for stopping the engine,
The engine stop switch is configured to cut off a gate signal output from the inverter controller in addition to stopping the engine when operated.   The gate signal cut-off by the engine stop switch is configured to be performed regardless of the PWM signal generated by the inverter controller and corresponding to the open / close ratio of the switching element of the assist power generation inverter. Construction machinery. The inverter controller is
PWM signal generating means for generating a PWM signal corresponding to the open / close ratio of the switching element of the inverter for assist power generation;
Gate signal generating means for outputting the gate signal to the assist power generation inverter based on the PWM signal;
The construction machine according to claim 1, wherein the gate signal generation unit includes a suppression terminal that stops output of the gate signal based on an operation of the engine stop switch. The inverter controller is
PWM signal generating means for generating a PWM signal corresponding to the open / close ratio of the switching element of the inverter for assist power generation;
Gate signal generating means for outputting the gate signal to the assist power generation inverter based on the PWM signal;
And a gate circuit provided between the PWM signal generation unit and the gate signal generation unit and configured to block the input of the PWM signal to the gate signal generation unit based on an operation of the engine stop switch. Item 3. The construction machine according to item 1 or 2. The inverter controller is
PWM signal generating means for generating a PWM signal corresponding to the open / close ratio of the switching element of the inverter for assist power generation;
Gate signal generating means for outputting the gate signal to the assist power generation inverter based on the PWM signal;
A relay circuit that disconnects between the PWM signal generation unit and the gate signal generation unit or between the gate signal generation unit and the assist power generation inverter based on the operation of the engine stop switch. The construction machine according to claim 1 or 2, wherein the construction machine is provided.

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