JP6291427B2 - Hybrid work machine - Google Patents

Description

  The present invention relates to a working machine such as a hydraulic excavator or a wheel-type hydraulic excavator, and more particularly to a hybrid working machine that uses an engine and an electric motor (electric motor) as power sources.

  Generally, a hydraulic excavator as a representative example of a work machine used at a construction site or the like has a vehicle body composed of a self-propelled lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body, A work device for performing work such as excavation work is attached to the front side of the upper swing body.

  On the other hand, as a working machine such as a hydraulic excavator, a hybrid working machine using both an engine and an electric motor is also known. The hybrid work machine includes, for example, an engine, an electric generator that generates electric power by being driven by the engine, or an electric generator (assist generator motor) that assists driving of the engine by being supplied with electric power, A battery (power storage device) that charges or discharges electric power generated by the motor generator, and drives the upper swing body to rotate by the electric power supplied from the battery, or regenerates based on the rotation of the upper swing body A turning electric motor (swing electric motor) for supplying regenerative power generated by operation to a battery, an inverter for a motor generator for controlling the operation of the motor generator, and an inverter for a turning motor for controlling the operation of the turning motor (Patent Document 1).

JP 2010-001712 A (Patent No. 4856124)

  By the way, according to the prior art, the motor generator and the motor generator inverter are connected by a three-phase (U phase, V phase, W phase) AC power line, and the turning motor and the turning motor inverter are connected to each other. Similarly, the three-phase AC power lines are also connected. In this case, there is a risk of incorrect wiring of the power line, that is, erroneously connecting the motor generator and the inverter for the swing motor and connecting the motor for swing and the inverter for the motor generator. Such miswiring of power lines may lead to an unexpected malfunction or failure of the motor generator or turning motor.

  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 to provide a hybrid working machine capable of suppressing erroneous wiring between an electric motor (electric motor) and an inverter.

  A hybrid work machine of the present invention includes a base, a swing body that is mounted on the base in a swingable manner and provided with a work device, an engine that is mounted on the swing body and drives a hydraulic pump, and is driven by the engine. An assist power generation motor that assists in driving the engine when power is supplied, and a power storage device that charges the power generated by the assist power generation motor or discharges the power, A swing electric motor that drives the revolving body with electric power supplied from the power storage device or supplies regenerative power generated by a regenerative operation based on rotation of the revolving body to the power storage device; and the assist power generation motor An assist power line that extends, and a first power line connector to which the assist power line is connected, control the operation of the assist power generation motor. A first inverter, a swing power line extending from the swing electric motor, a second inverter having a second power line connector to which the swing power line is connected, and controlling the operation of the swing electric motor; And a controller having an inverter control unit for controlling the two inverters.

In order to solve the above-described problem, the first aspect of the invention employs a configuration in which the first power line connector and the second power line connector are connectors having the same shape, and the first power line connector. A connection detection unit that detects whether the power line connected to the assist power line or the power line connected to the second power line connector is the turning power line, and the connection detection unit includes : An assist detection internal switch and a turn detection internal switch provided in each of the first inverter and the second inverter, an assist detection line connecting the controller and the assist detection internal switch, and the assist detection internal switch; An assist ground wire for connecting a ground, and a turning detection for connecting the controller and the turning detection internal switch. And a turning ground line connecting the turning detection internal switch and the ground, and the assist detection internal switch is closed in the first inverter and opened in the second inverter, and the turning detection internal switch the switch, in the second inverter in the first inverter becomes closed in. Doing so opens.

  According to a second aspect of the present invention, in addition to the turning electric motor, a turning hydraulic motor that drives the turning body to turn is provided, and the controller includes a turning hydraulic motor control unit that controls the turning hydraulic motor, and a connection detection unit. Based on the detection, a hydraulic / electric combined swing mode in which the swing body is driven by both the swing electric motor and the swing hydraulic motor, and a hydraulic single swing mode in which the swing body is driven only by the swing hydraulic motor. And a mode switching unit that switches between the two.

  The invention according to claim 3 includes a display device for displaying information, and the controller determines whether or not the connection between the assist power line and the first power line connector is appropriate based on detection by the connection detection unit. Or a connection determination unit that determines whether or not the connection between the turning power line and the second power line connector is appropriate, and when the connection determination unit determines that the connection is not appropriate, The present invention has a configuration including an erroneous wiring display command unit for displaying a certain effect on the display device.

  According to a fourth aspect of the invention, each of the first and second inverters includes a proper determination unit that determines whether or not its own state is appropriate, and the controller includes the determination result of the proper determination unit and the connection. Based on a determination result of the determination unit, an engine start switching unit that switches between permission and non-permission of starting of the engine, states of the first and second inverters, and permission / non-permission of starting of the engine In the display device.

  According to a fifth aspect of the present invention, the first inverter has a first signal line connector to which an assist signal line extending from the controller is connected, and the second inverter has a turning signal line extending from the controller. A second signal line connector to be connected; the first signal line connector and the second signal line connector are connectors of the same shape; and the connection detection unit detects the connection of the power line. In addition, it is also detected whether the signal line connected to the first signal line connector is the assist signal line or the signal line connected to the second signal line connector is the turning signal line. It is in the configuration.

  According to invention of Claim 1, the 1st power line connector and the 2nd power line connector are made into the connector of the same shape. For this reason, an assist power line or a turning power line can be connected to the first power line connector, and a turning power line or an assist power line can be connected to the second power line connector. On the other hand, the connection detection unit detects whether the power line connected to the first power line connector is an assist power line or whether the power line connected to the second power line connector is a turning power line. Therefore, whether or not the assist power line or the turning power line is properly wired to the first and second power line connectors can be determined based on the detection of the connection detection unit.

When it is determined that the wiring is not properly performed (incorrect wiring), the assembly work for assembling the hybrid work machine is performed using a notification device such as a display device or an acoustic device. It is possible to notify maintenance personnel (maintenance personnel, service personnel) and the like who perform maintenance. At this time, the worker or the like can re-route the assist power line and the turning power line based on the notification of the incorrect wiring, and can suppress the incorrect wiring. Furthermore, when it is determined that the wiring is incorrect, for example, the start (start) of the engine can be disabled. Thereby, it can suppress reliably that driving | running | working (operation) of a hybrid working machine is performed with incorrect wiring. In either case, an unexpected malfunction or failure of the assist power generation motor or the swing electric motor due to erroneous wiring can be suppressed, and the reliability and stability of the hybrid work machine can be improved.
In addition, the connection detection unit includes an assist detection internal switch and a turn detection internal switch, an assist detection line, an assist ground line, a turn detection line, and a turn ground line. For this reason, whether or not the connection state is appropriate (appropriate wiring or incorrect wiring) based on detection of the connection detection unit, that is, connection (energization) or non-connection (non-energization) with the ground by the connection detection unit Can be determined). Furthermore, when the first inverter fails, the assist power generation motor can be operated using the second inverter.

  According to the invention of claim 2, the mode switching unit switches the turning mode of the turning body between the hydraulic / electric combined turning mode and the hydraulic single turning mode based on the detection of the connection detecting unit. By switching the mode switching unit, the hybrid work machine can maintain the function as the work machine even when the first inverter fails, for example. Specifically, when the first inverter fails, the assist power line is connected to the second power line connector of the second inverter. At this time, the connection detection unit detects, for example, that the assist power line is not connected to the first power line connector or that the turning power line is not connected to the second power line connector.

  Based on this detection, the mode switching unit switches the swing mode of the swing body to the hydraulic single swing mode, and the second inverter is controlled by the control logic for the assist generator motor. Thereby, even if the first inverter breaks down, the assist power generation motor can be operated by the second inverter, and the swing body can be swung by the swing hydraulic motor. As a result, even if the first inverter fails, it is possible to maintain a necessary function as a work machine and improve the redundancy of the hybrid work machine.

  According to the invention of claim 3, when the connection determination unit determines that the connection of the assist power line or the turning power line is not appropriate, the display device may indicate that there is an incorrect wiring based on a command from the incorrect wiring display command unit. Is displayed. For this reason, for example, a worker or the like trying to start the engine can stop the engine start based on the indication that the wiring is incorrect displayed on the display device. It can suppress starting.

  On the other hand, when a worker or the like intentionally makes a miswiring state, for example, when the assist power line is connected to the second power line connector of the second inverter due to a failure of the first inverter, A message indicating that the wiring is incorrect is displayed on the device. In this case, the worker or the like can confirm that the wiring is as intended based on the display indicating the incorrect wiring displayed on the display device. That is, in the case of an intended miswiring, an operator or the like can start the engine after confirming that the miswiring is based on the display on the display device. Thereby, safety can be improved.

  According to the fourth aspect of the present invention, when the appropriate determination unit determines that the state of the first inverter is not appropriate, the engine start switching unit can prohibit the start of the engine. Thereby, the malfunctioning of the assist electric power generation motor accompanying the state of a 1st inverter being improper can be suppressed. In addition, on the display device, the detailed display command unit displays the states of the first and second inverters and the permission / non-permission of starting of the engine. Therefore, based on this display, workers including the operator can perform necessary maintenance such as maintenance, repair, and replacement.

  According to invention of Claim 5, the 1st signal line connector and the 2nd signal line connector are made into the connector of the same shape. Therefore, an assist signal line or a turning signal line can be connected to the first signal line connector, and a turning signal line or an assist signal line can be connected to the second signal line connector. On the other hand, the connection detection unit detects whether the signal line connected to the first signal line connector is an assist signal line or the signal line connected to the second signal line connector is a turning signal line. To do. Therefore, whether or not the assist signal line or the turning signal line is properly wired to the first and second signal line connectors can be determined based on the detection of the connection detection unit.

  When it is determined that the wiring is not properly performed (incorrect wiring), the assembly work for assembling the hybrid work machine is performed using a notification device such as a display device or an acoustic device. It is possible to notify maintenance personnel (maintenance personnel, service personnel) and the like who perform maintenance. At this time, the worker or the like can rewire the assist signal line and the turning signal line based on the notification of the incorrect wiring, and can suppress the incorrect wiring. Furthermore, when it is determined that the wiring is incorrect, for example, the start (start) of the engine can be disabled. Thereby, it can suppress reliably that driving | running | working (operation) of a hybrid working machine is performed with incorrect wiring. In either case, an unexpected malfunction or failure of the assist power generation motor or the swing electric motor due to erroneous wiring can be suppressed, and the reliability and stability of the hybrid work machine can be improved.

  In addition, when the first inverter fails, the assist power line is connected to the second power line connector of the second inverter in order to temporarily substitute the control of the operation of the assist generator motor by the second inverter, and The assist signal line is connected to the second signal line connector. In addition, the swing mode is switched to the hydraulic single swing mode, and the second inverter is switched to the control logic for the assist generator motor. In this state, a service person who recognizes that the wiring is intentionally wrong can start the engine after confirming a message to that effect on the display device when the engine is started. Thereby, the redundancy of the hybrid work machine can be improved while ensuring safety.

1 is a front view showing a hybrid hydraulic excavator according to an embodiment. It is a top view which shows an engine, an electrical storage apparatus, an assist electric power generation motor, a turning electric motor, a 1st inverter, a 2nd inverter, etc. with the simplified cooling system and the electrical system. It is an enlarged plan view showing a revolving frame, an engine, a heat exchange device, a front partition, a power storage device, an inverter unit, and the like. It is a perspective view which shows a turning frame, a front partition plate, an electrical storage apparatus, an inverter unit, etc. It is a perspective view which shows an inverter unit, a cable, etc. It is a front view which shows an inverter unit. It is a block diagram which shows roughly the hydraulic system and electric system of a hydraulic shovel. It is a block diagram which shows the state of the emergency wiring which reversed the wiring with respect to a 1st inverter, and the wiring with respect to a 2nd inverter. It is a circuit diagram which shows the wiring (normal wiring) at the time of normal of a 1st inverter, a 2nd inverter, an assist electric power generation motor, a turning electric motor, and a vehicle body controller. FIG. 10 is a circuit diagram similar to FIG. 9 showing a state where both the power line and the signal line are miswired (miswiring 1). FIG. 10 is a circuit diagram similar to FIG. 9 showing a state where only signal lines are miswired (miswiring 2). FIG. 10 is a circuit diagram similar to FIG. 9 showing a state in which only the power line is miswired (miswiring 3). It is a circuit diagram which shows the wiring (emergency wiring) at the time of emergency of a 1st inverter, a 2nd inverter, an assist electric power generation motor, a turning electric motor, and a vehicle body controller. FIG. 14 is a circuit diagram similar to FIG. 13 illustrating a state where both the power line and the signal line are miswired (emergency miswiring 1). FIG. 14 is a circuit diagram similar to FIG. 13 showing a state where only the power line is miswired (emergency miswiring 2). FIG. 14 is a circuit diagram similar to FIG. 13 showing a state in which only the signal line is miswired (emergency miswiring 3). It is a flowchart which shows the process by a vehicle body controller.

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

  In FIG. 1, a hydraulic excavator 1 which is a typical example of a work machine is configured as a hybrid hydraulic excavator (hybrid work machine). A hydraulic excavator 1 includes a self-propelled lower crawler traveling body 2 as a base body, and an upper revolving body as a revolving body that is mounted on the lower traveling body 2 so as to be able to swivel and constitutes a vehicle body together with the lower traveling body 2. 3 and a work device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down. The excavator 1 can perform excavation work of earth and sand using the working device 4.

  Here, 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. It comprises an idler wheel 2C provided on the opposite side, a drive wheel 2B and a crawler belt 2D wound around the idler wheel 2C (both 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 FIGS. 7 and 8) as hydraulic actuators, respectively, and travel around the hydraulic excavator 1 by driving the crawler belt 2D around. Let

  The working device 4 includes a boom 4A attached to the front side of the revolving frame 5 so as to be able to move up and down, an arm 4B attached to the front end side of the boom 4A, and a front end side of the arm 4B. The bucket 4C is a work tool that is movably attached, a boom cylinder 4D that drives the bucket 4C, an arm cylinder 4E, and a bucket cylinder 4F that is a work tool cylinder. The boom cylinder 4D, the arm cylinder 4E, the bucket cylinder 4F, which are hydraulic cylinders, the traveling hydraulic motors 2E, 2F, which are hydraulic motors, and the swing hydraulic motor 30 (see FIGS. 7 and 8) described later are driven by pressure oil ( It is a hydraulic actuator that operates.

  On the other hand, the upper swing body 3 includes a swing frame 5 serving as a base (frame) that forms a support structure of the upper swing body 3, a cab 6 mounted on the swing frame 5, a counterweight 8, an engine 9, The hydraulic pump 10, the assist power generation motor 13, the heat exchange device 14, the power storage device 27, the turning device 29, the inverter unit 34, and the like are configured.

  Here, as shown in FIG. 4, the revolving frame 5 is formed in a thick flat plate shape and extends in the front and rear directions, while standing on the bottom plate 5A and facing left and right. A left vertical plate 5B and a right vertical plate 5C extending in the front and rear directions, a plurality of left extending beams 5D extending from the left vertical plate 5B to the left, and a right extending from the right vertical plate 5C. The plurality of right extending beams 5E, the left side frame 5F extending in the front and rear directions, fixed to the front end side of each left extending beam 5D, and the front and rear directions fixed to the front end side of each right extending beam 5E. The extended right side frame 5G is roughly configured.

  A cab 6 that defines a cab is provided on the left side of the front part of the swivel frame 5. The cab 6 is provided with a driver's seat on which an operator is seated. Around the driver's seat, there are operating lever / pedal devices (not shown) for driving, operating lever devices 7A and 7B for work, and keys to be described later. A switch 59, a monitor device 62 (see FIGS. 7 and 8) are provided. The operation lever / pedal device and the operation lever devices 7A and 7B output a pilot pressure to the control valve 12, which will be described later, according to the tilting operation of the operation lever and the operation pedal by the operator. Further, as shown in FIG. 2, a vehicle body controller 57 described later is provided in the cab 6 so as to be located below the driver's seat. On the other hand, a counterweight 8 for balancing the weight with the work device 4 is provided at the rear end side of the revolving frame 5.

  The engine 9 is located on the front side of the counterweight 8 and disposed on the rear side of the turning frame 5. The engine 9 is mounted on the turning frame 5 in a horizontally placed state in which the axis of a crankshaft (not shown) extends in the left and right directions. A hydraulic pump 10 and an assist power generation motor 13 are attached to the right side which is one side of the left and right directions of the engine 9. On the other hand, a suction-type cooling fan 9A is attached to the left side (the side opposite to the hydraulic pump 10) which is the other side of the engine 9 in the left and right directions. The cooling fan 9 </ b> A is driven to rotate by the engine 9, sucks outside air from an air inlet 26 </ b> A formed in the left rear door 26, and supplies this outside air as cooling air F to the heat exchange device 14 and the like.

  Here, the engine 9 is composed of, for example, an electronically controlled engine, and is controlled by an ECU 9B (see FIGS. 7 and 8) that is an engine control device (engine control unit). Specifically, the engine 9 variably controls the fuel supply amount into the cylinder (combustion chamber), that is, the injection amount of the fuel injection device (electronic control injection valve) that injects the fuel into the cylinder by the ECU 9B. Is done. In this case, the ECU 9B is connected to a vehicle body controller 57 described later. Based on a control signal (command signal) from the vehicle body controller 57, the ECU 9 </ b> B variably controls the amount of fuel injected into the cylinder by the fuel injection device, and controls the rotational speed of the engine 9.

  The hydraulic pump 10 is attached to the right side (output side) of the engine 9. The hydraulic pump 10 is driven by the engine 9 so that various types such as left and right traveling hydraulic motors 2E and 2F, cylinders 4D, 4E and 4F, and a swing hydraulic motor 30 which will be described later are mounted on the hydraulic excavator 1. Pressure oil for operation is discharged toward the hydraulic actuator. As shown in FIGS. 7 and 8, the hydraulic pump 10 is composed of, for example, a variable displacement swash plate hydraulic pump or the like, and has a regulator (capacitance variable portion, tilting actuator) 10A for adjusting the pump displacement. The regulator 10A is variably controlled by an after-mentioned body controller 57 via an electro-hydraulic converter 61A.

  A hydraulic oil tank 11 is provided on the front side of the hydraulic pump 10. The hydraulic oil tank 11 stores hydraulic oil supplied to the hydraulic actuator. A control valve 12 (refer to FIGS. 7 and 8), which is an assembly of a plurality of directional control valves, includes a traveling operation lever / pedal device disposed in the cab 6 and working operation lever devices 7A and 7B. The direction of pressure oil supplied from the hydraulic pump 10 to various hydraulic actuators is controlled according to lever operation, pedal operation, and the like.

  The assist generator motor (generator motor, generator motor) 13 is attached to the right side of the engine 9 together with the hydraulic pump 10. The assist power generation motor 13 generates electric power when driven by the engine 9 or assists driving of the engine 9 when electric power is supplied from the power storage device 27. That is, the assist power generation motor 13 has a function as a generator that generates electric power by being driven by the engine 9 and a function as an electric motor that assists the driving of the engine 9 by electric power supplied from the power storage device 27. Yes.

  The heat exchange device 14 is located on the left side of the engine 9 and is mounted on the turning frame 5. As shown in FIG. 3, the heat exchange device 14 includes a support frame 15 attached on the revolving frame 5, an intercooler 16 assembled to the support frame 15, an engine radiator 17, an oil cooler 18, an air conditioner condenser. 19, the fuel cooler 20, the radiator 21 for hybrid devices, etc. are comprised as one unit.

  Here, the support frame 15 is disposed on the front side (cab 6 side) of the heat exchange device 14, extends to the left and right, and extends upward and downward, and the left front portion of the counterweight 8. The rear partition plate 15B is disposed on the rear side of the heat exchange device 14 and extends in the left and right directions and extends upward and downward, and the front and rear partition plates 15A and 15B are connected to the front. The intercooler 16, the engine radiator 17, and the connecting member 15 </ b> C that covers the upper portion of the oil cooler 18 are configured to extend rearward.

  The support frame 15 includes an intercooler 16 that cools air (compressed air) compressed by the turbocharger, an engine radiator 17 that cools engine cooling water, an oil cooler 18 that cools hydraulic oil, and air. An air conditioner condenser 19 for cooling the refrigerant for the conditioner (air conditioner) and a fuel cooler 20 for cooling the fuel are assembled.

  Further, as shown in FIGS. 2 and 3, a hybrid device radiator 21 that cools the cooling water for the hybrid device serving as a cooling medium for the hybrid device is assembled to the support frame 15. The cooling water for hybrid equipment cools the power storage device 27, the first and second inverters 42 and 49, and the swing electric motor 31 that constitute the hybrid equipment. That is, as shown with an arrow in FIG. 2, the hybrid device cooling water cooled by the hybrid device radiator 21 is supplied to the power storage device 27 by the pump 21A, and the first and second inverters 42, 49 are supplied. Circulates to the hybrid device radiator 21 via the swing electric motor 31. The assist power generation motor 13 is cooled by, for example, engine cooling water.

  In the heat exchange device 14, the outside air (cooling air F) sucked by the cooling fan 9 </ b> A is supplied to the hybrid device radiator 21, the air conditioner condenser 19, the fuel cooler 20, the intercooler 16, the engine radiator 17, and the oil cooler 18. Thus, cooling water for hybrid equipment, compressed air, engine cooling water, hydraulic oil, refrigerant for air conditioner, and fuel are cooled.

  The building cover 22 is located on the front side of the counterweight 8 and is provided on the revolving frame 5. The building cover 22 covers the engine 9, the hydraulic pump 10, the assist power generation motor 13, the heat exchange device 14, and the like. Here, as shown in FIG. 1, the upper side of the building cover 22 is constituted by an upper surface plate 23 and an engine cover 24. The left side of the building cover 22 includes a left front door 25 disposed on the rear side of the cab 6 and a left rear door 26 disposed between the left front door 25 and the counterweight 8. Has been. The left rear door 26 is provided with an intake port 26A for sucking outside air as cooling air F.

  When the left front door 25 performs maintenance of the first and second inverters 42 and 49, and further, as described later, the first and second inverters 42 and 49 It opens and closes when the wiring between the assist generator motor 13 and the swing electric motor 31 is changed. The left rear door 26 opens and closes when the heat exchange device 14 is maintained. On the other hand, the right side of the building cover 22 is constituted by a right door (not shown) disposed between the hydraulic oil tank 11 and the counterweight 8.

  The power storage device 27 performs power charging (power storage) and discharging. The power storage device 27 is disposed on the upstream side of the heat exchange device 14 in the flow direction of the cooling air F supplied to the heat exchange device 14. The power storage device 27 is configured using, for example, a lithium ion battery, and is mounted on the turning frame 5. The power storage device 27 charges (accumulates) the generated power generated by the assist power generation motor 13 and the regenerative power generated by the swing electric motor 31 by the swing deceleration operation (regeneration operation) of the upper swing body 3 or the charged power. Is discharged (powered) to the assist power generation motor 13 and the swing electric motor 31.

  In addition to the lithium ion battery, for example, an electric double layer capacitor can be used as the power storage device 27. When a capacitor is used for the power storage device 27, a chopper is connected between the power storage device 27 and the power storage device cables 47 and 54 (DC bus), and the voltage of the DC bus is held constant by the chopper. Is preferred.

  Here, as shown in FIGS. 3 and 4, the power storage device 27 includes a rectangular parallelepiped casing 27 </ b> A in which a plurality of battery modules are accommodated, and a box smaller than the casing 27 </ b> A. And an attached junction box (junction box) 27B. The connection box 27B connects between power storage device cables 47 and 54 extending from first and second inverters 42 and 49, which will be described later, and terminals of the power storage device 27. An electric circuit (not shown) such as a controller 27C (see FIGS. 7 and 8) for controlling charging and discharging of the power storage device 27 based on signals from 57 (control signal and command signal) is accommodated.

  Here, the first cable connection port 27D and the second cable connection port 27E are provided side by side in the left and right directions on the front side surface of the connection box 27B. A power storage device cable 47 that connects the first inverter 42 and the power storage device 27 is detachably connected to the first cable connection port 27D. A power storage device cable 54 for connecting the second inverter 49 and the power storage device 27 is connected to the second cable connection port 27E.

  On the rear side surface of the connection box 27B, there is provided a projecting portion 27F that is located in the middle portion in the left and right directions and projects rearward. The protrusion 27F is provided with a disconnect switch 28 for energizing or shutting off between the power storage device 27 and the first and second inverters 42 and 49. An operator, a maintenance worker (maintenance worker, service worker) or the like manually supplies power to the assist power generation motor 13 and the swing electric motor 31 from the power storage device 27 by operating the disconnect switch 28 during maintenance work, for example. Can be stopped.

  That is, the disconnect switch 28 is a switch that serves as an interlock function (safety device) of the power storage device 27. By setting the disconnect switch 28 to the disk connect state, it is possible to ensure safety when the power storage device cables 47 and 54, the assist power generation motor cable 46, and the swing electric motor cable 53 are inserted and removed. 7, 8, 9, etc., the disconnect switch 28 is provided with a disconnect detection device (disconnect detection unit) 28A for detecting the ON / OFF state (connect / disk connect) of the disconnect switch 28. It has been.

  Specifically, the disconnect switch 28 is connected to the vehicle body controller 57 via the disk connect detection line 28B. As shown in FIG. 9, the disconnect detection line 28B is connected to the C terminal of the vehicle body controller 57, and when the disconnect switch 28 is connected, the C terminal and the ground are connected (energized). On the other hand, although not shown, when the disconnect switch 28 is a disk connect, the C terminal and the ground are disconnected (not energized). The vehicle body controller 57 can determine the state of the disconnect switch 28 based on whether the C terminal is energized or not. When the disconnect switch 28 is in the disk connect state (not connected or not energized), the vehicle body controller 57 outputs a command signal (control signal) for displaying the fact on the monitor device 62, for example.

  The turning device 29 is provided at the center of the turning frame 5. The turning device 29 turns the upper turning body 3 with respect to the lower traveling body 2. Here, as shown in FIGS. 7 and 8, the turning device 29 includes a turning hydraulic motor 30 driven by pressure oil discharged from the hydraulic pump 10, and a turning electric motor (swing electric motor) attached to the turning hydraulic motor 30. ) 31 and a speed reduction mechanism 32 that decelerates the rotation input from the swing hydraulic motor 30 and / or the swing electric motor 31. The turning device 29 is provided with a turning hydraulic motor 30 in addition to the turning electric motor 31, so that the turning hydraulic motor 30 and the turning electric motor 31 cooperate to drive the upper turning body 3 to turn. It is configured as a swivel device.

  Here, the swing electric motor 31 rotates the upper swing body 3 with the electric power supplied from the power storage device 27. The swing electric motor 31 generates regenerative power by a regenerative operation based on the rotation of the upper swing body 3 when the upper swing body 3 decelerates and supplies the generated regenerative power to the power storage device 27. That is, the swing electric motor 31 functions as an electric motor that turns the upper swing body 3 when electric power is supplied from the power storage device 27, and the kinetic energy of the upper swing body 3 when the upper swing body 3 is decelerated. It has a function as a generator to convert into

  The utility chamber 33 is formed on the rear side of the cab 6. The utility room 33 is defined by the top plate 23 and the left front door 25 that constitute the building cover 22, and the front partition plate 15 </ b> A that constitutes the support frame 15 of the heat exchange device 14. Here, the lower side of the utility chamber 33 is closed by a floor plate 35, and an inverter assembly 38 is attached on the floor plate 35.

  Next, the inverter unit 34 disposed in the utility chamber 33 will be described.

  As shown in FIGS. 5 and 6, the inverter unit 34 is a unit in which a first inverter 42 and a second inverter 49 are integrated. The inverter unit 34 includes a floor plate 35, a pedestal 36, a vibration isolation member (vibration isolation rubber) 37, and an inverter assembly 38. In this case, a pedestal 36 is provided on the floor plate 35 so as to protrude upward, and the inverter assembly 38 is attached to the pedestal 36 via a vibration isolating member 37.

  The inverter assembly 38 includes a support bracket 39, a first inverter 42, a second inverter 49, and a connection pipe 56, which are sub-assembled as one assembly. Here, the support bracket 39 is mounted on the vibration isolation member 37. The support bracket 39 supports the first inverter 42 and the second inverter 49 together. As a result, the first inverter 42 and the second inverter 49 are elastically supported together on the vehicle body (the turning frame 5) using the single support bracket 39.

  In this case, the support bracket 39 supports the first inverter 42 and the second inverter 49 arranged side by side in the upward and downward directions. More specifically, the support bracket 39 includes a lower attachment portion 40 and an upper attachment portion 41. A second inverter 49 is attached to the lower attachment portion 40, and a first inverter 42 is attached to the upper attachment portion 41.

  The first inverter 42 controls the operation of the assist power generation motor 13. The first inverter 42 accommodates a plurality of switching elements made up of transistors, insulated gate bipolar transistors (IGBTs) and the like. ON (closed) / OFF (open) of each switching element is controlled by a controller 42A (see FIGS. 7 and 8). The controller 42 </ b> A is connected to the vehicle body controller 57 via the assist power generation motor signal cable 48.

  The controller 42A performs switching control of the first inverter 42 based on a command from the vehicle body controller 57, and in addition, performs an appropriate determination unit (failure) that determines whether or not the state of the first inverter 42 is appropriate. Determination unit). For example, the controller 42A determines that the first inverter 42 is not appropriate (a failure state or a failure state) when the voltage, current, component temperature, and the like are out of the appropriate range. In this case, the controller 42A stops the function of the first inverter 42 and notifies the vehicle body controller 57 via the assist power generation motor signal cable 48 that the first inverter 42 is not appropriate (fail processing). ).

  Here, the first inverter 42 has a first AC cable connection port 43, a first DC cable connection port 44, and a first signal cable connection port 45. The first AC cable connection port 43 serves as a first power line connector. An assist power generation motor cable 46 as an assist power line extending from the assist power generation motor 13 is detachably connected to the first AC cable connection port 43. The assist power generation motor cable 46 is a three-phase AC cable (high power cable) that connects the assist power generation motor 13 and the first inverter 42. The first AC cable connection port 43 is configured as a connection port (connector) having the same shape (same type) as the second AC cable connection port 50 of the second inverter 49 described later.

  On the other hand, a power storage device cable 47 extending from the power storage device 27 is detachably connected to the first DC cable connection port 44. The power storage device cable 47 is a DC cable (DC cable, DC bus) that connects the power storage device 27 and the first inverter 42. One end side of the power storage device cable 47 is connected to the first cable connection port 27 </ b> D of the power storage device 27, and the other end side is connected to the first DC cable connection port 44 of the first inverter 42.

  Further, the first signal cable connection port 45 serves as a first signal line connector. An assist generator motor signal cable 48 as an assist signal line extending from the vehicle body controller 57 is detachably connected to the first signal cable connection port 45. The assist generator motor signal cable 48 serves as a communication line (control signal line) for transmitting signals (information) such as control signals and command signals between the vehicle body controller 57 and the first inverter 42. The first signal cable connection port 45 is configured as a connection port (connector) having the same shape (same type) as the second signal cable connection port 52 of the second inverter 49 described later. Although not shown, the first inverter 42 has a signal cable extending from the assist power generation motor 13, for example, a detection signal (for example, a rotation detection sensor (resolver) provided in the assist power generation motor 13). The signal cable for outputting the assist motor speed signal) to the controller 42A of the first inverter 42 is also detachably connected.

  During power generation by the assist power generation motor 13, the first inverter 42 converts the power generated by the assist power generation motor 13 into DC power and supplies the DC power to the power storage device 27 through the power storage device cable 47. On the other hand, when the assist power generation motor 13 is driven as an electric motor, the first inverter 42 converts the DC power supplied from the power storage device 27 via the power storage device cable 47 into three-phase AC power, and is used for the assist power generation motor. Three-phase AC power is supplied to the assist generator motor 13 via the cable 46.

  On the other hand, the second inverter 49 controls the operation of the swing electric motor 31. Here, the second inverter 49 is an inverter having the same shape (same type, same type) made up of parts common to the first inverter 42. The second inverter 49 also accommodates a plurality of switching elements composed of transistors, insulated gate bipolar transistors (IGBTs), and the like. ON (closed) / OFF (open) of each switching element is controlled by a controller 49A (see FIGS. 7 and 8). The controller 49A is connected to the vehicle body controller 57 via the turning electric motor signal cable 55.

  The controller 49A performs switching control of the second inverter 49 based on a command from the vehicle body controller 57, and in addition, performs an appropriate determination unit (failure) for determining whether or not the state of the second inverter 49 is appropriate. Determination unit). For example, the controller 49A determines that the second inverter 49 is not appropriate (a failure state or a failure state) if the voltage, current, component temperature, and the like are out of the appropriate range. In this case, the controller 49A stops the function of the second inverter 49 and notifies the vehicle body controller 57 via the turning electric motor signal cable 55 that the second inverter 49 is not appropriate.

  Here, the second inverter 49 has a second AC cable connection port 50, a second DC cable connection port 51, and a second signal cable connection port 52. The second AC cable connection port 50 serves as a second power line connector. A swing electric motor cable 53 as a swing power line extending from the swing electric motor 31 is detachably connected to the second AC cable connection port 50. The swing electric motor cable 53 is a three-phase AC cable (strong electric cable) that connects the swing electric motor 31 and the second inverter 49.

  On the other hand, a power storage device cable 54 extending from the power storage device 27 is detachably connected to the second DC cable connection port 51. The power storage device cable 54 is a DC cable (DC cable, DC bus) that connects the power storage device 27 and the second inverter 49. That is, one end side of the power storage device cable 54 is connected to the second cable connection port 27 </ b> E of the power storage device 27, and the other end side is connected to the second DC cable connection port 51 of the second inverter 49.

  Further, the second signal cable connection port 52 serves as a second signal line connector. A turning electric motor signal cable 55 as a turning signal line extending from the vehicle body controller 57 is detachably connected to the second signal cable connection port 52. The swing electric motor signal cable 55 serves as a communication line (control signal line) for transmitting signals (information) such as control signals and command signals between the vehicle body controller 57 and the second inverter 49. Although not shown, the second inverter 49 has a signal cable extending from the swing electric motor 31, for example, a detection signal (for example, a rotation detection sensor (resolver) provided in the swing electric motor 31). The signal cable for outputting the turning motor speed signal) to the controller 49A of the second inverter 49 is also detachably connected.

  During power generation by the swing electric motor 31, the second inverter 49 converts power generated by the swing electric motor 31 (regenerative power) into DC power, and supplies the DC power to the power storage device 27 through the power storage device cable 54. On the other hand, when the swing electric motor 31 is driven as an electric motor, the second inverter 49 converts the DC power supplied from the power storage device 27 via the power storage device cable 54 into three-phase AC power, and is used for the swing electric motor. Three-phase AC power is supplied to the swing electric motor 31 via the cable 53.

  The connection pipeline 56 is provided between the first inverter 42 and the second inverter 49. The connection pipe 56 becomes a cooling water pipe through which the cooling water for hybrid equipment flows between the first inverter 42 and the second inverter 49. In this case, the hybrid device coolant that has flowed out of the first inverter 42 flows into the second inverter 49 through the connection pipe 56.

  The vehicle body controller 57 as a controller (control device, control unit) controls the assist power generation motor 13 and the swing electric motor 31 via the first inverter 42 and the second inverter 49. The vehicle body controller 57 is configured by a microcomputer or the like, like the controller 42A of the first inverter 42, the controller 49A of the second inverter 49, the controller 27C of the power storage device 27, and the ECU 9B of the engine 9. The vehicle body controller 57 is electrically connected to the controllers 42A, 49A, 27C and the ECU 9B to constitute a CAN.

  The vehicle body controller 57 is an upper controller of the controllers 42A, 49A, 27C and the ECU 9B, and comprehensively controls the controllers 42A, 49A, 27C and the ECU 9B. Specifically, the vehicle body controller 57 controls charging or discharging by the power storage device 27 by outputting a control signal to the controller 27C of the power storage device 27. In addition to this, the vehicle body controller 57 controls the operations of the assist power generation motor 13 and the swing electric motor 31 by outputting control signals to the controllers 42A and 49A of the first and second inverters 42 and 49. To do.

  Here, the vehicle body controller 57 is connected to the controller 42A of the first inverter 42 via the assist power generation motor signal cable 48, and via the controller 49A of the second inverter 49 and the signal cable 55 for the swing electric motor. Connected. The vehicle body controller 57 is connected to the controller 27 </ b> C of the power storage device 27 via the power storage device signal cable 58.

  7 and 8, the vehicle body controller 57 includes a key switch 59, hydraulic / electrical converters (HE) 60A, 60B, 60C, electric / hydraulic converters (EH) 61A, 61B, 61C, 61D, It is connected to the monitor device 62 and the like. The key switch 59 is provided, for example, in the vicinity of the driver's seat where the operator in the cab 6 is seated, and is operated by the operator when the engine 9 is started and stopped. The hydraulic / electrical converters 60A, 60B, 60C are constituted by, for example, pressure sensors. The hydraulic / electrical converter 60 </ b> A detects the pilot pressure of the operating lever device 7 </ b> A for turning the upper swing body 3, and outputs a detection signal (pressure signal) to the vehicle body controller 57. The hydraulic / electrical converters 60B and 60C detect the pressure of the hydraulic oil (pressure oil) supplied to the swing hydraulic motor 30 and the pressure of the hydraulic oil (pressure oil) discharged from the swing hydraulic motor 30, and the vehicle body A detection signal (pressure signal) is output to the controller 57.

  On the other hand, the electro-hydraulic converters 61A, 61B, 61C, 61D are configured by, for example, an electromagnetic proportional pressure reducing valve. The electro-hydraulic converter 61 </ b> A variably adjusts the pilot pressure supplied to the regulator 10 </ b> A of the hydraulic pump 10 in accordance with a control signal (command signal) from the vehicle body controller 57. The electro-hydraulic converters 61B, 61C, 61D variably adjust the pilot pressure supplied to the control valve 12 in accordance with a control signal (command signal) from the vehicle body controller 57. The hydraulic / electrical converters 60A, 60B, 60C and the electric / hydraulic converters 61A, 61B, 61C, 61D together with the vehicle body controller 57 constitute a turning control system.

  The monitor device 62 as a display device (notification device) is provided in the cab 6 and is configured by, for example, a liquid crystal monitor. The monitor device 62 notifies, for example, the operating status of the excavator 1 to an operator who operates the excavator 1 (such as an operator who performs maintenance of the excavator 1 as necessary). More specifically, on the display screen of the monitor device 62, the electric power among the assist power generation motor 13, the power storage device 27, and the swing electric motor 31 is based on a command (control signal, command signal) from the vehicle body controller 57. Information such as flow, engine speed, fuel remaining amount, oil remaining amount, cooling water temperature, abnormality information (caution information, warning information, malfunction information, failure information) of various devices is displayed.

  The vehicle body controller 57 includes an inverter control unit that controls the first and second inverters 42 and 49, a swing hydraulic motor control unit that controls the swing hydraulic motor 30, and a monitor device control unit (display device control unit) that controls the monitor device 62. It will be. Further, as described later, the vehicle body controller 57 determines whether or not the connection of the various cables 46, 48, 53, and 55 is appropriate based on the detection of the connection detection device 63 (see FIGS. 9 to 16). When the connection of the determination unit, various cables 46, 48, 53, 55 is not appropriate (in the case of incorrect wiring), an erroneous wiring display command unit for displaying that fact on the monitor device 62, and permission or non-permission of starting the engine 9 The engine start switching unit to be switched, the state (normal / failure) of the first and second inverters 42 and 49, and the detailed display command unit for displaying permission / non-permission of starting of the engine 9 on the monitor device 62. is there.

  Here, the vehicle body controller 57 includes an abnormality monitoring / abnormality processing control block 57A, an energy management control block 57B, a hydraulic / electric combined swing control block 57C, a hydraulic single swing control block 57D, a swing control switching block 57E as a mode switching unit, and the like. I have. The abnormality monitoring / abnormality processing control block 57A controls abnormality monitoring of the electric system of the excavator 1. The abnormality monitoring / abnormality processing control block 57A determines whether an abnormality such as malfunction or failure has occurred in the electric system such as the first and second inverters 42 and 49, the assist power generation motor 13, the turning electric motor 31, and the power storage device 27. When it is determined that an abnormality has occurred, necessary processing such as displaying the fact on the monitor device 62 is performed.

  The energy management control block 57B, for example, gives the power generation command or assist command to the assist power generation motor 13 based on the amount of power stored in the power storage device 27 that increases or decreases depending on the difference between the energy consumed by the swing electric motor 31 during acceleration and the energy regenerated during deceleration. The output is controlled to be kept within a predetermined range. For example, a voltage / current / temperature detection signal of the power storage device 27 is input from the controller 27C of the power storage device 27 via the power storage device signal cable 58 to the energy management control block 57B. Based on these detection signals, the energy management control block 57B performs control to keep the amount of power stored in the power storage device 27 within a predetermined range.

  The hydraulic / electric combined swing control block 57 </ b> C performs control to drive the upper swing body 3 by both the swing electric motor 31 and the swing hydraulic motor 30. The hydraulic single swing control block 57D performs control to drive the upper swing body 3 by only the swing hydraulic motor 30. The turning control switching block 57E switches whether the upper turning body 3 is turned by the hydraulic / electric combined turning control block 57C or the hydraulic single turning control block 57D. That is, the turning control switching block 57E has a hydraulic / electric combined turning mode in which the turning drive of the upper turning body 3 is performed by both the turning electric motor 31 and the turning hydraulic motor 30, and the turning hydraulic motor 30 performs the turning drive of the upper turning body 3. Switching to the hydraulic single swing mode performed only by

  For example, when there is no abnormality in the electric system and the turning electric motor 31 can be driven, the vehicle body controller 57 drives the upper turning body 3 to turn in the hydraulic / electric combined turning mode. That is, as shown in FIG. 7, the turning control switching block 57E selects the hydraulic / electric combined turning control block 57C based on the command of the abnormality monitoring / abnormal processing control block 57A, and the hydraulic / electric combined turning control block 57C The turning operation of the upper turning body 3 is controlled. In this case, the hydraulic pilot signal generated by the input of the lever operation of the operation lever device 7A is converted into an electric signal by the hydraulic / electric conversion device 60A and input to the hydraulic / electric combined swing control block 57C. On the other hand, the operating pressure of the swing hydraulic motor 30 is converted into an electrical signal by the hydraulic / electrical converters 60B and 60C and input to the hydraulic / electric combined swing control block 57C. Further, a swing motor speed signal is also input to the hydraulic / electric combined swing control block 57C from the controller 49A of the second inverter 49 via the swing electric motor signal cable 55.

  The hydraulic / electric combined swing control block 57C performs a predetermined calculation based on the hydraulic pilot signal from the operation lever device 7A, the operating pressure signal of the swing hydraulic motor 30 and the swing motor speed signal, and commands the torque of the swing electric motor 31. Is calculated. The command torque is output from the hydraulic / electric combined swing control block 57C to the controller 49A of the second inverter 49 via the swing electric motor signal cable 55. At the same time, the hydraulic / electric combined swing control block 57C outputs a torque reduction command for decreasing the output torque of the hydraulic pump 10 and the output torque of the swing hydraulic motor 30 by the amount of torque output by the swing electric motor 31A. , 61B.

  On the other hand, the pilot signal generated by the input of the lever operation of the operation lever device 7 </ b> A is also input to the control valve 12, and the hydraulic oil discharged from the hydraulic pump 10 is supplied to the turning hydraulic motor 30. Thereby, the turning electric motor 31 and the turning hydraulic motor 30 are simultaneously driven, and the upper turning body 3 is turned in the hydraulic / electric combined turning mode. At this time, the energy management control block 57B calculates a power generation command or an assist command for the assist power generation motor 13 based on the voltage, current, and temperature of the power storage device 27 output from the controller 27C of the power storage device 27. The power generation command or the assist command is output from the energy management control block 57B to the controller 42A of the first inverter 42 via the assist power generation motor signal cable 48, and performs control to keep the power storage amount of the power storage device 27 within a predetermined range. Do.

  By the way, as shown in FIG. 5 and FIG. 6, the first AC cable connection port 43 of the first inverter 42 and the second AC cable connection port 50 of the second inverter 49 have the same shape (model). When the assist power generation motor cable 46 and the swing electric motor cable 53 are wired, there is a risk of incorrect wiring. That is, there is a possibility that the assist power generation motor cable 46 is erroneously connected to the second AC cable connection port 50, and the turning electric motor cable 53 is connected to the first AC cable connection port 43. Further, when the first signal cable connection port 45 of the first inverter 42 and the second signal cable connection port 52 of the second inverter 49 have the same shape (model), they turn with the assist power generation motor signal cable 48. When wiring the electric motor signal cable 55, there is a risk of incorrect wiring. That is, there is a possibility that the assist power generation motor signal cable 48 is erroneously connected to the second signal cable connection port 52 and the swing electric motor signal cable 55 is connected to the first signal cable connection port 45.

  Therefore, in the embodiment, as shown in FIGS. 9 to 16, as a connection detection unit that detects the connection state of the various cables 46, 48, 53, and 55, that is, whether the wiring is proper or incorrect. A detection device 63 is provided. In the connection detection device 63, the power line connected to the first AC cable connection port 43 is the assist power generation motor cable 46, or the power line connected to the second AC cable connection port 50 is the swivel electric motor cable 53. Or the signal line connected to the first signal cable connection port 45 is the assist power generation motor signal cable 48, or the signal line connected to the second signal cable connection port 52 is the signal for the swing electric motor. Whether the cable 55 is detected or not.

  Here, as shown in FIG. 9, the connection detection device 63 includes a first inverter connection detection device 64 and a second inverter connection detection device 67, and the vehicle body controller 57, the first inverter 42, It is composed of an electric circuit connecting the second inverter 49. More specifically, the connection detection device 63 determines whether each of the power lines 46 and 53 and each connection port is based on whether the A terminal and the B terminal of the vehicle body controller 57 are connected to the ground (energization or non-energization). 43, and the connection between the signal lines 48 and 55 and the signal line connectors 45 and 52 are detected.

  Here, the first inverter connection detection device 64 includes an assist detection internal switch 65 and a turn detection internal switch 66 provided in the first inverter 42, and the second inverter connection detection device 67 includes: The assist detection internal switch 68 and the turn detection internal switch 69 provided in the second inverter 49 are configured. In other words, the first and second inverters 42 and 49 are inverters of the same shape (same type and same type) constituted by parts common to each other, and each includes an assist detection internal switch 65 and 68 and a turn detection internal switch 66. , 69 are provided.

  When the first and second inverters 42 and 49 are used as inverters of the assist power generation motor 13, the assist detection internal switch 65 is switched as the controller 42A (49A) is switched to the assist power generation motor control logic. (68) is turned ON (closed), and the turning detection internal switch 66 (69) is turned OFF (open). On the other hand, when the first and second inverters 42 and 49 are used as the inverters of the swing electric motor 31, the assist detection internal circuit is switched as the controller 49A (42A) is switched to the control logic for the swing electric motor. The switch 68 (65) is turned off (opened), and the turning detection internal switch 69 (66) is turned on (closed). When the first and second inverters 42 and 49 are in an abnormal state such as malfunction or failure, that is, not in an appropriate state, both the assist detection internal switches 65 and 68 and the turn detection internal switches 66 and 69 are OFF ( Open).

  Further, an assist detection motor signal cable 48 is provided with an assist detection line 71 that connects the A terminal (contact) of the vehicle body controller 57 and the assist detection internal switch 65 (68) in parallel. In addition, a turning detection line 72 for connecting the B terminal of the vehicle body controller 57 and the turning detection internal switch 69 (66) is arranged in parallel on the turning electric motor signal cable 55. The assist power generation motor cable 46 is provided with an assist ground line 73 that connects the assist detection internal switch 65 (68) and the ground. The turning electric motor cable 53 is provided with a turning ground line 74 that connects the turning detection internal switch 69 (66) and the ground. The assist detection line 71, the turning detection line 72, the assist ground line 73, and the turning ground line 74 together with the assist detection internal switches 65 and 68 and the turn detection internal switches 66 and 69 constitute the connection detection device 63.

  As shown in FIG. 9, during normal wiring, both the A terminal and the B terminal of the vehicle body controller 57 are connected to the ground. As shown in FIG. 10, when both the motor cables 46 and 53 and the signal cables 48 and 55 are miswired, both the A terminal and the B terminal of the vehicle body controller 57 are disconnected from the ground. When only signal cables 48 and 55 are miswired as shown in FIG. 11, and when only motor cables 46 and 53 are miswired as shown in FIG. Both are disconnected from ground. The vehicle body controller 57 determines that the connection state of the cables 46, 48, 53, and 55 is appropriate based on detection of the connection detection device 63, that is, connection (energization) and non-connection (non-energization) with the ground by the connection detection device 63. (Whether the cables 46, 48, 53, and 55 are proper wiring or incorrect wiring). This determination can be made, for example, by the abnormality monitoring / abnormality processing control block 57A of the vehicle body controller 57.

  Thus, the vehicle body controller 57 has a connection determination unit that determines whether or not the connection of the cables 46, 48, 53, and 55 is appropriate based on the detection of the connection detection device 63. Furthermore, in the embodiment, when the first inverter 42 fails, the assist power generation motor 13 is operated using the second inverter 49, and the swing drive of the upper swing body 3 is performed in the hydraulic single swing mode. be able to.

  That is, when the first inverter 42 fails, as shown in FIGS. 8 and 13, the assist power generation motor cable 46 is connected to the second AC cable connection port 50 of the second inverter 49, and the swing electric motor is connected. The motor cable 53 is connected to the first AC cable connection port 43 of the first inverter 42. Further, the assist power generation motor signal cable 48 is connected to the second signal cable connection port 52 of the second inverter 49, and the swing electric motor signal cable 55 is connected to the first signal cable connection port 45 of the first inverter 42. Connect to. Although not shown, a signal line extending from the assist power generation motor 13 is connected to the second inverter 49, and a signal line extending from the swing electric motor 31 is connected to the first inverter 42.

  At this time, since the first inverter 42 is not in an appropriate state (abnormal state such as malfunction or failure), both the assist detection internal switch 65 and the turn detection internal switch 66 are turned off (open). On the other hand, the controller 49A of the second inverter 49 is connected to a computer from the outside and switched to the assist power generation motor control logic. Along with this switching, the assist detection internal switch 68 of the second inverter 49 is turned ON (closed), and the turning detection internal switch 69 is turned OFF (open). As shown in FIG. 13, in such an emergency positive wiring, only the A terminal of the vehicle body controller 57 is connected to the ground.

  On the other hand, as shown in FIG. 14, when both the motor cables 46 and 53 and the signal cables 48 and 55 are miswired (the normal wiring is normal) in the emergency wiring, Both B terminals are disconnected from the ground. As shown in FIG. 15, only the motor cables 46 and 53 are erroneously wired in the emergency wiring (the normal wiring is normal), and only the signal cables 48 and 55 are used in the emergency wiring as shown in FIG. Is miswired (the normal wiring is normal), both the A terminal and the B terminal of the vehicle body controller 57 are disconnected from the ground. In this way, the vehicle body controller 57 also detects the cable 46 based on the detection of the connection detection device 63, that is, connection (energization) and non-connection (non-energization) with the ground by the connection detection device 63 even during emergency wiring. , 48, 53, 55 can be determined (whether the cables 46, 48, 53, 55 are emergency emergency wiring or emergency miswiring).

  In the embodiment, when the first inverter 42 fails, the assist generator motor 13 is operated using the second inverter 49, and the turning drive of the upper swing body 3 is performed in the hydraulic single swing mode. The vehicle body controller 57 performs the processing shown in FIG. The processing program shown in FIG. 17 is stored (stored) in a memory (not shown) of the vehicle body controller 57, for example.

  As shown in FIG. 17, the vehicle body controller 57 has a mode switching unit (turning control switching block 57 </ b> E) that switches between the hydraulic / electric combined swing mode and the hydraulic single swing mode based on the detection of the connection detection device 63. (Step 18). The vehicle body controller 57 also has an erroneous wiring display command section for displaying on the monitor device 62 that the wiring is incorrect when it is determined that the connection is not appropriate (steps 13 and 17).

  Further, the vehicle body controller 57 starts the engine 9 based on whether or not the connection of the cables 46, 48, 53, and 55 is appropriate and whether the first and second inverters 42 and 49 are appropriate. There is also an engine start switching unit that switches between permission and non-permission (step 14). The vehicle body controller 57 also has a detailed display command section that causes the monitor device 62 to display the states of the first and second inverters 42 and 49 and permission / non-permission of starting of the engine 9 (step 13). , 17, 19). The process of FIG. 17 executed by the vehicle body controller 57 will be described later.

  The hybrid hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  When an operator boarding the cab 6 starts the engine 9, the hydraulic pump 10 and the assist power generation motor 13 are driven by the engine 9. As a result, the pressure oil discharged from the hydraulic pump 10 is changed to the left, the left according to the lever operation and pedal operation of the operation lever device 7A and 7B for operation provided in the cab 6 and the operation operation lever devices 7A and 7B. It discharges toward the right traveling hydraulic motors 2E, 2F, the turning hydraulic motor 30, the boom cylinder 4D, the arm cylinder 4E, and the bucket cylinder 4F of the work device 4. As a result, the excavator 1 performs a traveling operation by the lower traveling body 2, a turning operation by the upper revolving body 3, excavation work by the work device 4, and the like.

  Here, when the output torque of the engine 9 is larger than the driving torque of the hydraulic pump 10 when the hydraulic excavator 1 is operated, the assist generator motor 13 is driven as a generator by the surplus torque. As a result, the assist power generation motor 13 generates AC power, which is converted into DC power by the first inverter 42 and stored in the power storage device 27. On the other hand, when the output torque of the engine 9 is smaller than the driving torque of the hydraulic pump 10, the assist power generation motor 13 is driven as an electric motor by the electric power from the power storage device 27, and assists the driving of the hydraulic pump 10 by the engine 9 (assist). To do.

  The turning electric motor 31 is driven by supplying electric power charged to the power storage device 27, and turns the upper turning body 3 on the lower traveling body 2 in cooperation with the turning hydraulic motor 30. Further, the swing electric motor 31 generates AC power (regenerative power) by a regenerative operation when the upper swing body 3 is decelerated and this AC power is converted into DC power by the second inverter 49, and the power storage device 27. Stored in

  Next, processing (startup sequence) performed by the vehicle body controller 57 will be described with reference to the flowchart of FIG.

  When the operator turns on the key switch 59 to start energization of the vehicle body controller 57 and the processing operation of FIG. 17 starts, the vehicle body controller 57 determines whether or not the disconnect switch (DC switch) 28 is disconnected in step 1. Determine whether. This determination can be made based on detection by the disconnect detection device 28A, that is, based on energization (connect) or non-energization (disconnect) of the C terminal of the vehicle body controller 57.

  If “YES” in step 1, that is, if it is determined that the disconnect switch 28 is disconnected (non-energized), the process proceeds to step 2, and the monitor device 62 displays that it is a disk connect. In step 2, a display indicating that the disk is connected and a display indicating that the upper swing body 3 is driven to rotate only by the swing hydraulic motor 30, that is, that the “hydraulic single swing mode” is displayed on the monitor device 62. May be. The operator can recognize from the monitor device 62 that the disconnect switch 28 is disconnected. In the subsequent step 3, it is determined whether or not the key switch 59 has been operated to START.

  If “NO” is determined in step 3, that is, if it is determined that the key switch 59 is not operated to START, the process proceeds to step 4 to determine whether or not the key switch 59 is operated OFF. If “YES” in step 4, that is, if it is determined that the key switch 59 has been turned OFF, the process returns to START via return. On the other hand, if it is determined in step 4 that “NO”, that is, the key switch 59 has not been turned OFF, the process returns to step 3 and repeats the processes in steps 3 and 4.

  If “YES” in step 3, that is, if it is determined that the key switch 59 has been operated to START, the engine 9 is started with the disconnect switch 28 disconnected by the operator due to abnormality or maintenance of the power storage device 27. It is possible that (startup) is intended. Therefore, in step 5, the engine 9 is started (started), and the hydraulic excavator 1 is started in the hybrid OFF mode in which the power generation / drive (assist) by the assist power generation motor 13 and the swing drive / regeneration of the swing electric motor 31 are not performed. At this time, the turning control switching block 57E of the vehicle body controller 57 selects the hydraulic single turning control block 57D.

  In this case, the hydraulic excavator 1 is driven (operated) based on the pressure oil supplied from the hydraulic pump 10 that is rotationally driven by the engine 9. The operation in the hybrid OFF mode is terminated when the key switch 59 is turned OFF in the subsequent step 6. That is, if “YES” in step 6, that is, if it is determined that the key switch 59 has been turned OFF, the engine 9 is stopped and the power supply to the electrical equipment is stopped. And it returns to the start via return.

  On the other hand, if “NO” in step 1, that is, if it is determined that the disconnect switch 28 is connected (energized), the process proceeds to step 7. In step 7, it is determined whether the connection state of the cables 46, 48, 53, 55 is abnormal or normal (whether the cables 46, 48, 53, 55 are miswiring or proper wiring). This determination can be made based on the detection of the connection detection device 63, that is, the energization / non-energization of the A terminal and the B terminal of the vehicle body controller 57.

  In this case, as shown in FIG. 9, when both the A terminal and the B terminal are energized (connected to the ground), it is determined that the connection state of the cables 46, 48, 53, and 55 is appropriate (normal). Can do. On the other hand, as shown in FIGS. 10 to 16, in other cases, it can be determined that the connection state of the cables 46, 48, 53, 55 is not appropriate (abnormal).

  If “NO” in step 7, that is, if it is determined that the connection state of the cables 46, 48, 53, 55 is not abnormal (proper), the process proceeds to step 8, and whether or not the key switch 59 has been operated to START. Determine whether. If “NO” in step 8, that is, if it is determined that the key switch 59 has not been operated by START, the process proceeds to step 9 to determine whether or not the key switch 59 has been operated OFF. If “YES” in step 9, that is, if it is determined that the key switch 59 has been turned OFF, the process returns to the start via return. On the other hand, if “NO” in step 9, that is, if it is determined that the key switch 59 has not been turned OFF, the process returns to step 8 and the processes of steps 8 and 9 are repeated.

  If “YES” in step 8, that is, if it is determined that the key switch 59 has been operated to START, the process proceeds to step 10. In step 10, the engine 9 is started (started), and the hydraulic excavator 1 is started in a hybrid ON mode in which power generation / drive (assist) by the assist power generation motor 13 and rotation drive / regeneration of the swing electric motor 31 are performed. At this time, the turning control switching block 57E of the vehicle body controller 57 selects the hydraulic / electric combined turning control block 57C.

  The hybrid ON mode operation is terminated when the key switch 59 is turned OFF in the following step 11. That is, if “YES” in step 11, that is, if it is determined that the key switch 59 has been turned OFF, the engine 9 is stopped and the power supply to the electrical equipment is stopped. And it returns to the start via return.

  On the other hand, if “YES” in step 7, that is, if it is determined that the connection state of the cables 46, 48, 53, 55 is abnormal (not appropriate), the process proceeds to step 12. In step 12, it is determined whether or not the first inverter 42 (and the second inverter 49 if necessary) has failed. This determination can be made based on the determination of the controller 42A of the first inverter 42. That is, the controller 42A of the first inverter 42 determines whether or not its own state is appropriate based on whether or not the voltage, current, component temperature, etc. of the first inverter 42 are within an appropriate range ( It has a self-check function that determines whether it is a failure state or a failure state. The same applies to the controller 49A of the second inverter 49. In step 12, whether or not the first inverter 42 (second inverter 49) has failed based on the determination result of the controller 42A of the first inverter 42 (controller 49A of the second inverter 49). Determine.

  If “NO” in step 12, that is, if it is determined that the first inverter 42 (second inverter 49) has not failed, the process proceeds to step 13 and the monitor device 62 displays that the wiring is incorrect. To do. In step 13, a message indicating incorrect wiring and a message indicating that engine start is not permitted are also displayed. In step 14 that follows, the engine start is not permitted. That is, even if the key switch 59 is operated to START by the operator, the engine 9 is prevented from starting (starting). In this case, if “YES” in step 15, that is, if it is determined that the key switch 59 has been turned OFF, the process returns to START via return.

  On the other hand, if “YES” in step 12, that is, if it is determined that the first inverter 42 has failed, the process proceeds to step 16 where the controller 49A of the second inverter 49 controls the assist power generation motor. Determine if it is logic. That is, when the first inverter 42 fails, the assist function of the assist power generation motor 13 is impaired, and the basic performance as a work machine may be reduced. Therefore, in the embodiment, when the first inverter 42 fails, the assist power generation motor cable 46 is connected to the second AC cable connection port 50 of the second inverter 49 as shown in FIGS. The swing electric motor cable 53 is connected to the first AC cable connection port 43 of the first inverter 42. Further, the assist power generation motor signal cable 48 is connected to the second signal cable connection port 52 of the second inverter 49, and the swing electric motor signal cable 55 is connected to the first signal cable connection port 45 of the first inverter 42. Connect to. Although not shown, a signal line extending from the assist power generation motor 13 is connected to the second inverter 49, and a signal line extending from the swing electric motor 31 is connected to the first inverter 42.

  At this time, since the first inverter 42 is not in an appropriate state (abnormal state such as malfunction or failure), both the assist detection internal switch 65 and the turn detection internal switch 66 are turned off (open). On the other hand, the controller 49A of the second inverter 49 is connected to a computer from the outside and switched to the assist power generation motor control logic. Along with this switching, the assist detection internal switch 68 of the second inverter 49 is turned ON (closed), and the turning detection internal switch 69 is turned OFF (open). As shown in FIG. 13, in such emergency wiring, only the A terminal of the vehicle body controller 57 is connected to the ground. In step 16, the control of the second inverter 49 is performed based on the detection of the connection detection device 63, that is, whether only the A terminal of the vehicle body controller 57 is energized (the A terminal is energized and the B terminal is deenergized). It is determined whether or not the device 49A is the assist generator motor control logic and the proper wiring (emergency wiring) in this state.

  If it is determined in step 16 that only the A terminal of the vehicle body controller 57 is not energized, the controller 49A of the second inverter 49 is not the control logic for the assist generator motor, or the emergency shown in FIGS. It is considered to be incorrect wiring. In this case, “NO” is determined in step 16, and the process proceeds to step 17. In step 17, the monitor device 62 is informed that there is an error (more specifically, the fact that the controller 49A of the second inverter 49 is not the control logic for the assist power generation motor, or that there is an emergency miswiring). indicate. Then, the process proceeds to step 14 and the engine start is not permitted. The processing in step 14 and step 15 is as described above.

  On the other hand, if it is determined in step 16 that only the A terminal of the vehicle body controller 57 is energized, the controller 49A of the second inverter 49 is the control logic for the assist power generation motor and is shown in FIG. It is considered that the wiring is appropriate in an emergency. In this case, “YES” is determined in step 16, and the process proceeds to step 18 and step 19. In step 18, the swing mode of the upper swing body 3 is set to the hydraulic single swing mode. That is, the turning control switching block 57E of the vehicle body controller 57 selects the hydraulic single turning control block 57D. In step 19, the monitor device 62 is informed that the emergency wiring is in the hydraulic single swing mode.

  In the subsequent step 20, it is determined whether or not the key switch 59 has been operated to START. If “NO” in step 20, that is, if it is determined that the key switch 59 has not been operated to START, the process proceeds to step 21 to determine whether or not the key switch 59 has been operated to be OFF. If "YES" in step 21, that is, if it is determined that the key switch 59 has been turned OFF, the process returns to START via return. On the other hand, if it is determined in step 21 that “NO”, that is, the key switch 59 is not operated to be OFF, the process returns to step 20 and the processes of steps 20 and 21 are repeated.

  If “YES” in step 20, that is, if it is determined that the key switch 59 has been operated to START, the process proceeds to step 22. In step 22, the engine 9 is started (started up), and power generation / drive (assist) is performed by the assist power generation motor 13, but the swing electric motor 31 is not driven for rotation or regeneration, that is, a hydraulic excavator in the hydraulic single swing mode. Start 1

  The operation in the hydraulic single swing mode is terminated when the key switch 59 is turned OFF in the following step 23. That is, if “YES” in step 23, that is, if it is determined that the key switch 59 has been turned OFF, the engine 9 is stopped and the power supply to the electrical equipment is stopped. And it returns to the start via return.

  Thus, according to the embodiment, the first inverter 42 and the second inverter 49 are the same type of inverter. More specifically, the first AC cable connection port 43 of the first inverter 42 and the second AC cable connection port 50 of the second inverter 49 are connectors of the same shape (same type), and the first The first signal cable connection port 45 of the inverter 42 and the second signal cable connection port 52 of the second inverter 49 are connectors having the same shape (same type). Therefore, the assist power generation motor cable 46 or the swing electric motor cable 53 can be connected to the first AC cable connection port 43, and the swing electric motor cable is connected to the second AC cable connection port 50. 53 or an assist generator motor cable 46 can be connected. Further, the assist signal generating motor signal cable 48 or the swing electric motor signal cable 55 can be connected to the first signal cable connection port 45, and the second signal cable connection port 52 can be connected to the swing electric motor. The signal cable 55 or the assist power generation motor signal cable 48 can be connected.

  On the other hand, in the connection detection device 63, the power line connected to the first AC cable connection port 43 is the assist power generation motor cable 46, or the power line connected to the second AC cable connection port 50 is for the swivel electric motor. The signal line connected to the first signal cable connection port 45 is the cable 53 or the assist power generation motor signal cable 48, or the signal line connected to the second signal cable connection port 52 is a swing electric motor. It is detected whether the signal cable 55 is used. Therefore, the vehicle body controller 57 determines whether or not the assist power generation motor cable 46 or the swing electric motor cable 53 is properly wired in the first and second AC cable connection ports 43 and 50. Whether the assist generator motor signal cable 48 or the swing electric motor signal cable 55 is properly wired in the signal cable connection ports 45 and 52 is detected by the connection detection device 63 (the A terminal and B of the vehicle body controller 57). It can be determined based on whether the terminal is energized or not.

  If it is determined that the wiring is not properly performed (erroneous wiring), an assembly worker or a maintenance worker (maintenance staff, service staff) indicates that the wiring is wrong through the monitor device 62 by the processing of steps 13 and 17. ) Etc. At this time, the worker or the like uses the assist power generation motor cable 46, the swing electric motor cable 53, the assist power generation motor signal cable 48, and the swing electric motor signal cable 55 based on the erroneous wiring display of the monitor device 62. Wiring can be performed again, and erroneous wiring can be suppressed. Further, when it is determined that the wiring is wrong, the start (start) of the engine 9 is not permitted by the processing of step 14. Thereby, it can suppress reliably that the driving | running | working (operation) of the hydraulic shovel 1 is performed with incorrect wiring. As a result, an unexpected malfunction or failure of the assist generator motor 13 or the swing electric motor 31 due to incorrect wiring can be suppressed, and the reliability and stability of the excavator 1 can be improved.

  According to the embodiment, the turning control switching block 57E switches the turning mode between the hydraulic / electric combined turning mode and the hydraulic single turning mode by the processing of steps 10 and 18 based on the detection of the connection detection device 63. The excavator 1 can maintain the function as the excavator 1 even when the first inverter 42 breaks down by switching the turning mode. Specifically, when the first inverter 42 breaks down, the second inverter 49 temporarily substitutes the control of the operation of the assist generator motor 13, so that the assist generator motor cable 46 is connected to the second inverter 42. 49, the assist power generation motor signal cable 48 is connected to the second signal cable connection port 52 of the second inverter 49. By this connection, the connection detection device 63 detects that the wiring is incorrect.

  Based on this detection, the turning control switching block 57E switches the turning mode to the hydraulic single turning mode and controls the second inverter 49 for the assist generator motor 13 by the processing of steps 7, 12, 16, and 19. Switch to logic. At this time, in step 19, since it is displayed that the wiring is incorrect on the monitor device 62, the workers who have recognized that the wiring is intentionally incorrect confirmed the display indicating that the wiring is incorrect. Above you can start the engine. In step 22, the second inverter 49 controls the assist power generation motor 13 with the control logic for the assist power generation motor 13. Thereby, even if the first inverter 42 breaks down, the assist power generation motor 13 can be operated by the second inverter 49, and the upper swing body 3 can be rotated by the swing hydraulic motor 30. As a result, even if the first inverter 42 fails, the necessary function as the hydraulic excavator 1 can be maintained, and the redundancy of the hydraulic excavator 1 can be improved.

  According to the embodiment, when it is determined that the wiring is incorrect based on the detection of the connection detection device 63 by the processing of steps 7, 12, and 16, the monitoring device 62 is erroneously processed by the processing of steps 13 and 17. It is displayed that it is wiring. For this reason, for example, a worker or the like trying to start the engine 9 can stop the start of the engine 9 on the basis of the display indicating that the wiring is incorrect displayed on the monitor device 62. Thus, it is possible to prevent the engine 9 from starting.

  On the other hand, when an operator or the like intentionally makes a miswiring state, that is, the failure of the first inverter 42 causes the assist generator motor cable 46 and the assist generator motor signal cable 48 to be connected to the second inverter 49. Even when connected, the processing of step 19 causes the monitor device 62 to display that it is an emergency wiring. In this case, the worker or the like can confirm that the wiring is as intended based on the display indicating the emergency wiring displayed on the monitor device 62. That is, when the emergency wiring is intentionally made, the worker or the like can start the engine 9 after confirming the emergency wiring based on the display of the monitor device 62. Thereby, safety can be improved.

  According to the embodiment, when the controller 42A of the first inverter 42 determines that the state of the first inverter 42 is not appropriate (failure), the engine 9 is processed by the processing of steps 12, 16, and 14. Can be disallowed. Thereby, the malfunctioning of the assist generator motor 13 due to the failure of the first inverter 42 can be suppressed. In addition, an error is displayed on the monitor device 62 by the process of step 17. Therefore, based on this display, workers including the operator can perform necessary maintenance such as maintenance, repair, and replacement. For example, if the monitor device 62 displays that the state of the first inverter 42 is not appropriate and that the engine 9 is not permitted to start, the assist generator motor cable 46 and the assist generator motor signal cable 48 are connected. Connected to the second inverter 49. In this case, it is possible to operate in the hydraulic single swing mode in which the assist power generation motor 13 is operated by the second inverter 49 by the processing in steps 7, 12, 16, 18, and 22. Thereby, the redundancy of the hydraulic excavator 1 can be improved.

  In the above-described embodiment, the connection detection device 63 is connected to the second AC cable connection port 50 as to whether the power line connected to the first AC cable connection port 43 is the assist power generation motor cable 46. The case where the power line is configured to detect whether the power line is the cable 53 for the swing electric motor has been described as an example. However, the present invention is not limited to this. For example, the power line connected to the first AC cable connection port 43 is the assist power generation motor cable 46 or is connected to the second AC cable connection port 50. It can also be set as the structure which detects one of the electric power lines made | formed is the cable 53 for turning electric motors. This is because if one connection can be detected, the other connection can be estimated. The same applies to the signal lines (assist generator motor signal cable 48 and swing electric motor signal cable 55).

  In the first embodiment described above, the case where the first inverter 42 is attached to the upper attachment portion 41 of the support bracket 39 and the second inverter 49 is attached to the lower attachment portion 40 has been described as an example. However, the present invention is not limited to this. For example, the second inverter may be attached to the upper attachment portion and the first inverter may be attached to the lower attachment portion.

  In the embodiment described above, the crawler hydraulic excavator 1 provided with the crawler belt 2D has been described as an example of the hybrid working machine. However, the present invention is not limited to this, and can be widely applied to various working machines such as a wheeled hydraulic excavator provided with wheels.

1 Hydraulic excavator (hybrid work machine)
2 Lower traveling body (base)
3 Upper swing body (revolving body)
4 Working device 9 Engine 10 Hydraulic pump 13 Assist power generation motor 27 Power storage device 30 Swing hydraulic motor 31 Swing electric motor 42 First inverter 42A Controller (property determination unit)
43 First AC cable connection port (first power line connector)
45 First signal cable connection port (first signal line connector)
46 Assist power generation motor cable (assist power line)
48 Assist power generation motor signal cable (assist signal line)
49 Second inverter 49A Controller (property determination unit)
50 Second AC cable connection port (second power line connector)
52 Second signal cable connection port (second signal line connector)
53 Cable for turning electric motor (turning power line)
55 Signal cable for turning electric motor (turning signal line)
57 Body controller (controller, inverter control unit, connection determination unit, incorrect wiring display command unit, engine start switching unit, detailed display command unit)
57C Hydraulic Electric Combined Turning Control Block (Swivel Hydraulic Motor Control Unit)
57D Hydraulic single turning control block (turning hydraulic motor control unit)
57E Turning control switching block (mode switching unit)
62 Monitor device (display unit)
63 Connection detector (connection detector)

Claims (5)

A substrate;
A swivel body mounted on the base body so as to be swiveled and provided with a working device;
An engine mounted on the revolving structure and driving a hydraulic pump;
An assist generator motor that generates electric power by being driven by the engine, or assists driving of the engine by being supplied with electric power;
A power storage device that charges power generated by the assist power generation motor or discharges the power;
A swivel electric motor that drives the swivel body to rotate with electric power supplied from the power storage device or supplies regenerative power generated by a regenerative operation based on rotation of the swivel body to the power storage device;
An assist power line extending from the assist generator motor;
A first inverter having a first power line connector to which the assist power line is connected and controlling the operation of the assist generator motor;
A turning power line extending from the turning electric motor;
A second inverter having a second power line connector to which the turning power line is connected and controlling the operation of the turning electric motor;
In a hybrid work machine comprising a controller having an inverter control unit for controlling the first and second inverters,
The first power line connector and the second power line connector are connectors of the same shape,
A connection detection unit that detects whether the power line connected to the first power line connector is the assist power line or the power line connected to the second power line connector is the turning power line ;
The connection detection unit
An assist detection internal switch and a turn detection internal switch provided in each of the first inverter and the second inverter;
An assist detection line connecting the controller and the assist detection internal switch;
An assist ground line connecting the assist detection internal switch and the ground;
A turning detection line connecting the controller and the turning detection internal switch;
A swivel ground line connecting the swivel detection internal switch and the ground,
The assist detection internal switch is closed in the first inverter and open in the second inverter,
It said pivoting detecting internal switch, wherein in the in the first inverter becomes a closed second inverter hybrid working machine, characterized that you opened. In addition to the turning electric motor, a turning hydraulic motor that drives the turning body to turn,
The controller is
A swing hydraulic motor controller for controlling the swing hydraulic motor;
Based on the detection of the connection detection unit, the hydraulic / electric combined swing mode in which the swing body is driven by both the swing electric motor and the swing hydraulic motor, and the swing drive of the swing body is performed only by the swing hydraulic motor. The hybrid work machine according to claim 1, further comprising a mode switching unit that switches between a single hydraulic swing mode to be performed. A display device for displaying information;
The controller is
Based on the detection of the connection detection unit, whether or not the connection between the assist power line and the first power line connector is appropriate, or the connection between the turning power line and the second power line connector is appropriate A connection determination unit that determines whether or not
The hybrid operation according to claim 1 or 2, further comprising: an erroneous wiring display command unit that displays on the display device that the wiring is incorrect when the connection determination unit determines that the connection is not appropriate. Machine. The first and second inverters include an appropriate determination unit that determines whether or not their own state is appropriate,
The controller is
Based on the determination result of the appropriateness determination unit and the determination result of the connection determination unit, an engine activation switching unit that switches between permission and non-permission of activation of the engine,
The hybrid work machine according to claim 3, comprising a detailed display command unit for displaying the states of the first and second inverters and permission / non-permission of starting of the engine on the display device. The first inverter has a first signal line connector to which an assist signal line extending from the controller is connected,
The second inverter has a second signal line connector to which a turning signal line extending from the controller is connected,
The first signal line connector and the second signal line connector are connectors of the same shape,
In addition to detecting the connection of the power line, the connection detection unit is configured such that the signal line connected to the first signal line connector is the assist signal line or connected to the second signal line connector. The hybrid work machine according to claim 1, 2, 3 or 4, wherein the signal line is also configured to detect whether the signal line is the turning signal line.

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