electric excavator

Abstract

To improve safety.SOLUTION: An electric excavator according to one embodiment includes a battery, a charging port for supplying power to the battery, and an openable / closable cover that is provided as an exterior of the electric excavator and that opens when servicing the electric excavator, and is configured to perform control so that a state in which the battery is being charged from the charging port and a state in which the openable / closable cover is open are not established at the same time.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an electric excavator.

Background Art

[0002] In recent years, an electric-driven excavator having an electric motor that operates a hydraulic drive system has been proposed. In the electric-driven excavator, the electric motor is driven by electric power supplied from a battery provided in the main body.

[0003] When the electric-driven excavator charges the battery, it is connected to an external power source via a charging cable. When the excavator is connected to an external power source, it is difficult to perform the same working operation as when it is not connected to the external power source.

[0004] The technology described in Patent Document 1 describes a wired electric excavator. In the wired electric excavator described in Patent Document 1, when the charging cable is connected, the running of the excavator is suppressed while operating with a bucket or the like.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In electric excavators, there are not only wired types but also excavators that perform work in a wireless manner. In a wireless excavator, usually, during charging, the operation and movement of a bucket or the like are suppressed. For this reason, during charging of the excavator, there may be a desire for an operator to perform maintenance.

[0007] However, caution is necessary when performing maintenance on an excavator while the battery is charging. For example, an excavator has a cooling circuit to cool the battery, but while the battery is charging, the refrigerant in the refrigerant circuit may start flowing intermittently, which could cause the cooling fan to rotate at high speed intermittently.

[0008] Therefore, in light of the above issues, the objective is to improve safety by implementing a control system that prevents the openable / closable cover, which is provided as part of the exterior of the shovel, from being open while the battery is charging. [Means for solving the problem]

[0009] To achieve the above objective, an electric excavator according to one embodiment of the present disclosure includes a battery and a charging port for supplying power to the battery, An electric excavator having the above A cover is provided as an exterior for the electric excavator, and is a hinged cover that opens when performing maintenance on the electric excavator. A fixing mechanism that allows the aforementioned openable / closable cover to be fixed in the closed position, Control is performed to prevent the state in which the battery is being charged from the charging port and the state in which the retractable cover is open from occurring simultaneously. The system includes a control device, and the control device controls the fixing mechanism to fix the open / closed cover in a closed position when charging the battery. . [Effects of the Invention]

[0010] According to the above embodiment, safety is improved by preventing the retractable cover from remaining open when charging the battery. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a side view showing a shovel (excavator) according to the first embodiment. [Figure 2] Figure 2 is a schematic block diagram showing an example of the configuration of an excavator according to the first embodiment. [Figure 3] Figure 3 is a block diagram showing the components of the cooling system of the excavator according to the first embodiment. [Figure 4]Figure 4 is a top view showing an example of the arrangement structure of various devices in the upper rotating body according to the first embodiment. [Figure 5] Figure 5 is a perspective view showing an example of a maintenance door for the upper rotating body according to the first embodiment. [Figure 6] Figure 6 is a front view showing the external appearance of the shovel according to the first embodiment. [Figure 7] Figure 7 shows the arrangement of each component in the internal space with the outer flap open according to the first embodiment. [Figure 8] Figure 8 is a flowchart showing the process when the shovel controller according to the first embodiment charges the battery. [Figure 9] Figure 9 illustrates the locking mechanism of the maintenance door according to the second embodiment. [Figure 10] Figure 10 is a flowchart showing the process when the shovel controller according to the second embodiment charges the battery. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. Furthermore, the embodiments described below are illustrative and not limiting to the invention, and not all features or combinations thereof described in the embodiments are necessarily essential to the invention. In addition, identical or corresponding components in each drawing are denoted by the same or corresponding reference numerals, and their descriptions may be omitted.

[0013] (First Embodiment) First, as an example of an electric excavator, an overview of the excavator 200 according to the first embodiment will be described.

[0014] [Shovel Overview] As shown in Figure 1, the excavator 200 according to this embodiment comprises a lower traveling body 1, an upper rotating body 3 mounted on the lower traveling body 1 so as to be rotatable via a slewing mechanism 2, a boom 4, an arm 5, and a bucket 6 as attachments, and a cabin 10.

[0015] The lower traveling body 1 includes, for example, a pair of left and right crawlers, and each crawler is hydraulically driven by traveling hydraulic motors 1R and 1L (see FIG. 2), thereby enabling self-propulsion.

[0016] The upper slewing body 3 is hydraulically driven by a slewing hydraulic motor 2M (see FIG. 2) through a slewing mechanism 2, thereby slewing with respect to the lower traveling body 1. All driven elements (for example, the slewing hydraulic motor 2M) are hydraulically driven by the hydraulic oil supplied from the main pump 14 (see FIG. 2). This corresponds to a configuration in which the power source (engine) of a so-called hydraulic excavator is replaced with a pump motor 12.

[0017] Further, the upper slewing body 3 may be electrically driven by a slewing electric motor that is driven by the electric power supplied from a battery module 19 through the slewing mechanism 2 instead of the slewing hydraulic motor 2M. In this case, for example, the excavator 200 is connected from the battery module 19 to the slewing electric motor via an inverter. And the slewing electric motor may perform a power running operation for slewingly driving the upper slewing body 3 and a regenerative operation for generating regenerative power to slewingly brake the upper slewing body 3 under the control of the excavator controller 30 and the inverter. Also, the slewing electric motor may supply the regenerative power to the battery module 19 or the pump motor 12 via the inverter.

[0018] The boom 4 is attached to the front center of the upper slewing body 3 so as to be able to pitch, an arm 5 is attached to the tip of the boom 4 so as to be able to rotate vertically, and a bucket 6 is attached to the tip of the arm 5 so as to be able to rotate vertically. The boom 4, the arm 5, and the bucket 6 are each hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9 as hydraulic actuators.

[0019] Bucket 6 is an example of an end attachment, and other end attachments may be attached to the tip of the arm 5 in place of bucket 6, depending on the work to be done. Other end attachments may be different types of buckets from bucket 6, such as slope buckets or dredging buckets. Other end attachments may also be different types of end attachments from buckets, such as breakers, agitators, or grapples.

[0020] The cabin 10 is mounted on the front left side of the upper rotating body 3, and its interior (room) is equipped with a cockpit where the operator sits, as well as control devices 26 (see Figure 2), which will be described later.

[0021] An outer flap 150 (an example of an outer cover member) is provided approximately in the center of the left side of the upper rotating body 3. The outer flap 150 is openable and closable, and the space inside when the outer flap 150 is opened is provided with a charging vehicle inlet (an example of a charging port) for charging the shovel 200. The charging vehicle inlet will be described later.

[0022] The shovel 200 operates its driven elements, such as the lower travel body 1 (left and right crawlers), upper slewing body 3, boom 4, arm 5, and bucket 6, in response to the operation of the operator seated in the cabin 10.

[0023] Furthermore, instead of being configured to be operable by an operator in the cabin 10, or in addition to being configured to be operable by an operator in the cabin 10, the shovel 200 may also be configured to be remotely operated from outside the shovel 200. When the shovel 200 is remotely operated, the interior of the cabin 10 may be unoccupied. The following explanation will proceed on the premise that operator operation includes at least one of operation of the operator's control device 26 in the cabin 10 and remote operation by an external operator.

[0024] Remote operation includes, for example, a mode in which the shovel 200 is operated by operation inputs related to the actuator of the shovel 200 performed by a predetermined external device. In this case, the shovel 200 may be equipped with a communication device (not shown) capable of communicating with a predetermined external device, and may transmit image information (captured image) output by an imaging device (not shown) to the external device. The external device may then display the received image information (captured image) on a display device (hereinafter, "remote operation display device") provided on its own device. In addition, various information images (information screens) displayed on the output device 50 (display device) inside the cabin 10 of the shovel 200 may also be displayed on the remote operation display device of the external device. This allows the operator of the external device to remotely operate the shovel 200 while checking the display contents, such as captured images and information screens showing the surroundings of the shovel 200, displayed on the remote operation display device. The shovel 200 may then operate a hydraulic actuator in response to a remote control signal, which is received from an external device via a communication device and represents the content of the remote control, thereby driving the driven elements such as the lower traveling body 1 (left and right crawlers), the upper slewing body 3, the boom 4, the arm 5, and the bucket 6.

[0025] Furthermore, remote operation may include, for example, a mode in which the shovel 200 is operated by external voice input or gesture input from people (e.g., workers) in the vicinity of the shovel 200. Specifically, the shovel 200 recognizes voices spoken by surrounding workers or gestures made by workers through a voice input device (e.g., microphone) or gesture input device (e.g., imaging device) mounted on the shovel 200 (itself). The shovel 200 may then operate actuators according to the content of the recognized voices or gestures to drive driven elements such as the lower traveling body 1 (left and right crawlers), the upper slewing body 3, the boom 4, the arm 5, and the bucket 6.

[0026] Furthermore, the shovel 200 may automatically operate its actuators regardless of the operator's actions. This enables the shovel 200 to automatically operate at least some of its driven elements, such as the lower traveling body 1 (crawler 1CL, 1CR), upper slewing body 3, boom 4, arm 5, and bucket 6 (a so-called "automatic driving function" or "machine control function").

[0027] The automatic driving function may include a function that automatically operates driven elements (actuators) other than the target driven element (hydraulic actuator) in response to the operator's operation device 26 or remote operation (a so-called "semi-automatic driving function"). The automatic driving function may also include a function that automatically operates at least some of the multiple driven elements (actuators) on the premise that there is no operator operation device 26 or remote operation (a so-called "fully automatic driving function"). In the case of the shovel 200, if the fully automatic driving function is enabled, the interior of the cabin 10 may be unoccupied. Furthermore, the semi-automatic driving function and fully automatic driving function may include a mode in which the operation content of the driven elements (actuators) subject to automatic driving is automatically determined according to predetermined rules. Furthermore, the semi-automatic driving function and fully automatic driving function may also include a mode in which the shovel 200 autonomously makes various judgments, and the operation content of the driven elements (actuators) subject to automatic driving is autonomously determined according to the results of those judgments (a so-called "autonomous driving function").

[0028] [Shovel configuration] Next, with reference to Figure 1 and Figure 2, the configuration of the shovel 200 according to this embodiment will be described.

[0029] Figure 2 is a schematic block diagram showing an example of the configuration of the shovel 200 according to this embodiment.

[0030] In Figure 2, mechanical power lines are shown as double lines, hydraulic lines as thick solid lines, pilot lines as dashed lines, and electric drive / control lines as thin solid lines.

[0031] <Hydraulic drive system> The hydraulic drive system of the excavator 200 according to this embodiment includes hydraulic travel motors 1R and 1L, a swing hydraulic motor 2M, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, which hydraulically drive each of the driven elements such as the lower traveling body 1, boom 4, arm 5, and bucket 6. The hydraulic drive system of the excavator 200 according to this embodiment also includes a pump motor 12, a main pump 14, and a control valve 17.

[0032] The pump motor 12 (an example of a motor) is the power source for the hydraulic drive system. The pump motor 12 is, for example, an IPM (Interior Permanent Magnet) motor. The pump motor 12 is connected to a high-voltage power supply including a battery module 19 via an inverter 18. The pump motor 12 is powered by three-phase AC power supplied from the battery module 19 via the inverter 18 and drives the main pump 14 and the pilot pump 15. The drive control of the pump motor 12 may be performed by the inverter 18 under the control of the shovel controller 30, which will be described later.

[0033] The main pump 14 draws hydraulic fluid from the hydraulic fluid tank T and discharges it into the high-pressure hydraulic line 16, thereby supplying hydraulic fluid to the control valve 17 through the high-pressure hydraulic line 16. The main pump 14 is driven by a pump motor 12. The main pump 14 is, for example, a variable displacement hydraulic pump, and under the control of the shovel controller 30 (described later), a regulator (not shown) controls the angle (tilt angle) of the swash plate. This allows the main pump 14 to adjust the piston stroke length and thus adjust the discharge flow rate (discharge pressure).

[0034] The main pump 14 may be driven by power from another power source in addition to the electric motor 12 for the pump. For example, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be regenerated to drive the main pump 14. Specifically, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be used to drive a hydraulic motor arranged coaxially with the rotation axis of the main pump 14. Alternatively, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 to the hydraulic fluid tank due to the weight of the boom 4 and arm 5 when the boom 4 is lowered or the arm 5 is closed may be regenerated to power a generator. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic fluid discharged from the boom cylinder 7 and arm cylinder 8 into the hydraulic fluid tank due to the weight of the boom 4 and arm 5 can be used to drive a hydraulic motor arranged coaxially with the generator, thereby causing the generator to produce electricity. In this case, the power generated by the generator may be supplied to the pump motor 12 or used to charge the battery module 19.

[0035] The control valve 17 is a hydraulic control device that controls the hydraulic drive system in response to operator commands or automatic driving functions. As described above, the control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16 and is configured to selectively supply hydraulic fluid from the main pump 14 to the hydraulic actuators (travel hydraulic motors 1R, 1L, swing hydraulic motor 2M, boom cylinder 7, arm cylinder 8, and bucket cylinder 9). For example, the control valve 17 is a valve unit that includes multiple control valves (directional control valves) that control the flow rate and direction of the hydraulic fluid supplied from the main pump 14 to each of the hydraulic actuators. The hydraulic fluid supplied from the main pump 14 and that has passed through the control valve 17 and hydraulic actuators is discharged from the control valve 17 to the hydraulic fluid tank T.

[0036] <Electric drive system> The electric drive system of the shovel 200 according to this embodiment includes a pump motor 12, a sensor 12s, and an inverter 18. The electric drive system of the shovel 200 according to this embodiment also includes a high-voltage power supply configured by a battery module 19 or the like.

[0037] Sensor 12s includes a current sensor 12s1, a voltage sensor 12s2, and a rotational state sensor 12s3.

[0038] The current sensor 12s1 detects the current of each of the three phases (U phase, V phase, and W phase) of the pump motor 12. The current sensor 12s1 is installed, for example, in the power path between the pump motor 12 and the inverter 18. The detection signals corresponding to each of the three phases of the pump motor 12 detected by the current sensor 12s1 are directly received by the inverter 18 via a communication line. Alternatively, these detection signals may be received by the shovel controller 30 via a communication line and input to the inverter 18 via the shovel controller 30.

[0039] The voltage sensor 12s2 detects the applied voltage to each of the three phases of the pump motor 12. The voltage sensor 12s2 is installed, for example, in the power path between the pump motor 12 and the inverter 18. The detection signals corresponding to the applied voltages of each of the three phases of the pump motor 12 detected by the voltage sensor 12s2 are directly received by the inverter 18 via a communication line. Alternatively, these detection signals may be received by the shovel controller 30 via a communication line and input to the inverter 18 via the shovel controller 30.

[0040] The rotational state sensor 12s3 detects the rotational state of the pump motor 12 (e.g., rotational position (rotation angle), rotational speed, etc.). The rotational state sensor 12s3 is, for example, a rotary encoder or a resolver.

[0041] The inverter 18 drives the pump motor 12 under the control of the shovel controller 30. The inverter 18 includes, for example, a conversion circuit that converts DC power to three-phase AC power and three-phase AC power to DC power, a drive circuit that switches and drives the conversion circuit, and a control circuit that outputs a control signal (for example, a PWM (Pulse Width Modulation) signal) that defines the operation of the drive circuit.

[0042] The control circuit of the inverter 18 controls the drive of the pump motor 12 while understanding its operating state. For example, the control circuit of the inverter 18 understands the operating state of the pump motor 12 based on the detection signal of the rotation state sensor 12s3. Alternatively, the control circuit of the inverter 18 may understand the operating state of the pump motor 12 by sequentially estimating the rotation angle of the rotation shaft of the pump motor 12 based on the detection signal of the current sensor 12s1 and the detection signal of the voltage sensor 12s2 (or the voltage command value generated during the control process).

[0043] Furthermore, at least one of the drive circuit and control circuit of the inverter 18 may be provided outside the inverter 18.

[0044] The battery module 19 is configured to supply charged power to the electronic components within the shovel 200. The specific configuration will be described later.

[0045] <Operation system> The operating system of the shovel 200 according to this embodiment includes a pilot pump 15, an operating device 26, and a pressure control valve 31.

[0046] The pilot pump 15 supplies pilot pressure to various hydraulic devices (e.g., pressure control valve 31) mounted on the shovel 200 via the pilot line 25. This allows the pressure control valve 31 to supply pilot pressure to the control valve 17 according to the operation of the operating device 26 (e.g., operating amount and direction) under the control of the shovel controller 30. Therefore, the shovel controller 30 and the pressure control valve 31 can realize the operation of the driven element (hydraulic actuator) according to the operation of the operating device 26 by the operator. Furthermore, the pressure control valve 31 can supply pilot pressure to the control valve 17 according to the remote operation content specified by the remote operation signal under the control of the shovel controller 30. The pilot pump 15 is, for example, a fixed-displacement hydraulic pump and is driven by the pump motor 12 as described above.

[0047] The control device 26 is located within reach of the operator in the cockpit of the cabin 10 and is used by the operator to operate each of the driven elements (i.e., the left and right crawlers of the lower traveling body 1, the upper slewing body 3, the boom 4, the arm 5, and the bucket 6, etc.). In other words, the control device 26 is used by the operator to operate the hydraulic actuators (e.g., travel hydraulic motors 1R, 1L, slewing hydraulic motor 2M, boom cylinder 7, arm cylinder 8, and bucket cylinder 9, etc.) or electric actuators that drive each of the driven elements. The control device 26 is, for example, electrically operated and outputs an electrical signal (hereinafter referred to as "operation signal") corresponding to the operator's operation. The operation signal output from the control device 26 is taken up by the shovel controller 30 via the signal line 28. As a result, the shovel controller 30 controls the pressure control valve 31 and controls the operation of the driven elements (actuators) of the shovel 200 in accordance with the operator's operation and operation commands corresponding to the automatic driving function.

[0048] The operating device 26 includes, for example, levers 26A to 26C. Lever 26A may be configured to accept operations on the arm 5 (arm cylinder 8) and the upper slewing body 3 (slewing motion) in response to forward / backward and left / right movements, respectively. Lever 26B may be configured to accept operations on the boom 4 (boom cylinder 7) and the bucket 6 (bucket cylinder 9) in response to forward / backward and left / right movements, respectively. Lever 26C may be configured to accept operations on the lower traveling body 1 (crawler), for example.

[0049] Furthermore, if the control valve 17 is composed of an electromagnetic pilot-operated control valve (directional control valve), the operating signal from the electric operating device 26 may be directly input to the control valve 17, and each hydraulic control valve may perform an operation according to the operation of the operating device 26. Alternatively, the operating device 26 may be a hydraulic pilot type that outputs a pilot pressure according to the operation. In this case, the pilot pressure according to the operation is supplied to the control valve 17.

[0050] The pressure control valve 31 outputs a predetermined pilot pressure using hydraulic fluid supplied from the pilot pump 15 through the pilot line 25 under the control of the shovel controller 30. The pilot line on the secondary side of the pressure control valve 31 is connected to the control valve 17, and the pilot pressure output from the pressure control valve 31 is supplied to the control valve 17.

[0051] <Power system> The power supply system of Shovel 200 is a group of components for supplying power to various electrical devices. Shovel 200 also includes a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging as a configuration for charging the battery module 19.

[0052] The vehicle inlet 101 for normal charging is configured to be connectable to a charging connector (an example of a charging component) provided at the tip of a predetermined cable (hereinafter referred to as the "charging cable") of an external power supply.

[0053] The AC-DC converter 103 for charging converts AC power supplied from an external power source via the vehicle inlet 101 for normal charging into DC power that can be used to charge the battery 192, and supplies it to the battery module 19.

[0054] The rapid charging vehicle inlet 102 is configured to be connectable to a charging connector (an example of a charging component) provided at the end of a charging cable of an external power source (e.g., a charging station). The rapid charging vehicle inlet 102 is, for example, an inlet for performing rapid charging based on CHAdeMO®. In this embodiment, by using such a DC charging method, DC power can be supplied to the battery module 19 without going through an AC-DC converter.

[0055] This embodiment describes an example in which a charging component is directly connected to a vehicle inlet 101 for normal charging (an example of a charging port) and a vehicle inlet 102 for rapid charging (an example of a charging port) using a charging connector provided at the tip of a charging cable. However, this embodiment is not limited to the method of directly connecting to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for rapid charging using a charging connector. For example, a charging component using a wireless power supply system may be connected to the charging port and charged from an external power source.

[0056] The battery module 19 of the excavator 200 according to this embodiment supplies power to each component within the excavator 200. The battery module 19 includes a battery 192 and a battery controller 191.

[0057] The battery 192 supplies power to various components within the shovel 200. For example, the battery 192 supplies charged (stored) power to the pump motor 12. The battery 192 also charges the power generated (regenerative power) of the pump motor 12.

[0058] Battery 192 is charged (stored of energy) by being connected to an external power source via a charging cable.

[0059] Battery 192 is, for example, a lithium-ion battery and has a relatively high output voltage (e.g., several hundred volts).

[0060] The battery controller 191 controls the internal configuration of the battery module 19. For example, the battery controller 191 monitors the temperature status of the battery 192 from the output of a temperature sensor (not shown) and calculates the State of Charge (SOC) of the battery 192. The battery controller 191 then outputs the temperature sensor detection result and the SOC to the shovel controller 30. This allows the shovel controller 30 to display the temperature of the battery 192 and the SOC of the battery 192 on the output device 50 (display device) inside the cabin 10.

[0061] In this embodiment, the battery controller 191 determines whether or not charging is possible depending on whether or not a charging connector is connected to the vehicle inlet 101 for normal charging or the vehicle inlet 102 for rapid charging. However, this embodiment is not limited to determining whether or not power can be supplied based on whether or not a charging connector is connected. For example, in the case of wireless power supply, other methods may be used, such as determining whether or not power can be supplied by mutual communication with charging equipment provided with an external power source.

[0062] The battery controller 191 then communicates with the charging equipment that has an external power source (e.g., a charging station) when it determines that it is connected to an external power source via a charging cable and charging connector (in other words, when it determines that it is in a state where power can be supplied). The battery controller 191 then communicates with the charging equipment and, if the charging equipment authorizes the supply of power, it starts supplying power from the external power source.

[0063] Furthermore, a power converter may be provided between the battery module 19 and the pump motor 12 to boost the output voltage of the battery module 19 and apply it to the pump motor 12. Also, as described above, when part or all of the driven part is electrically driven, the power from the battery module 19 is supplied to an electric actuator that electrically drives the driven part, either in place of or in addition to the pump motor 12.

[0064] The DC-DC converter 44 is installed, for example, on the upper rotating body 3 and steps down the very high voltage DC power output from the battery module 19 to a predetermined voltage (for example, about 24 volts) and outputs it. The output power of the DC-DC converter 44 is supplied to the battery 46 for charging (storage) or to electrical equipment (hereinafter referred to as "low-voltage equipment") powered by the battery 46. Low-voltage equipment includes, for example, the shovel controller 30. Low-voltage equipment also includes, for example, the water pump 64 and fan 90 described later.

[0065] For example, as shown in Figure 2, the shovel 200 is equipped with one DC-DC converter 44.

[0066] The DC-DC converter 44 may be replaced with an alternator. In this case, the alternator may be installed on the upper rotating body 3 and generate electricity using the power of the pump motor 12. The power generated by the alternator is supplied to the battery 46, as in the case of the DC-DC converter 44, and is used to charge (store) the battery 46 or to supply low-voltage equipment such as the shovel controller 30.

[0067] <Control System> The control system for the shovel 200 according to this embodiment includes a shovel controller 30, an output device 50, and an input device 52.

[0068] The output device 50 is located inside the cabin 10 and outputs various information to the operator under the control of the shovel controller 30. The output device 50 includes, for example, a display device that outputs (notifies) information to the operator in a visual manner. The display device may be, for example, installed in a location easily visible to the operator inside the cabin 10 and displaying various information images under the control of the shovel controller 30. The display device may be, for example, a liquid crystal display or an organic EL (electroluminescence) display. The output device 50 also includes, for example, a sound output device that outputs information to the operator in an auditory manner. The sound output device may be, for example, a buzzer or a speaker.

[0069] The input device 52 is located inside the cabin 10 and receives various inputs from the operator. The input device 52 may include, for example, an operation input device that receives operation inputs from the operator. The operation input device includes, for example, buttons, toggles, levers, touch panels, touch pads, etc. The input device 52 may also include, for example, an audio input device that receives voice inputs from the operator and a gesture input device that receives gesture inputs from the operator. The audio input device includes, for example, a microphone that acquires the voice of the operator inside the cabin 10. The gesture input device includes, for example, an indoor camera capable of capturing images of the operator's gestures inside the cabin 10. Signals corresponding to the operator inputs received by the input device 52 are taken up by the shovel controller 30.

[0070] The shovel controller 30 may implement each function using any hardware, or any combination of hardware and software. For example, the shovel controller 30 may be centered around a computer that includes a processor such as a CPU (Central Processing Unit), a memory device (main memory) such as RAM (Random Access Memory), a non-volatile auxiliary storage device such as ROM (Read Only Memory), and an interface device for input / output with the outside.

[0071] The shovel controller 30 controls the drive of the shovel 200. For example, the shovel controller 30 outputs a control command to the pressure control valve 31 in response to an operation signal input from the operating device 26, and the pressure control valve 31 outputs a pilot pressure corresponding to the operation of the operating device 26. In this way, the shovel controller 30 can realize the operation of the driven elements (hydraulic actuators) of the shovel 200 that correspond to the operation of the electric operating device 26.

[0072] Furthermore, if the shovel 200 is remotely controlled, the shovel controller 30 may, for example, perform control related to the remote operation. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31, causing the pressure control valve 31 to output a pilot pressure corresponding to the remote operation. This allows the shovel controller 30 to realize the operation of the shovel 200 (driven element) corresponding to the remote operation.

[0073] Furthermore, the shovel controller 30 may also perform control related to the automatic driving function, for example. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31 and apply a pilot pressure corresponding to the operation command for the automatic driving function from the pressure control valve 31 to the control valve 17. In this way, the shovel controller 30 can realize the operation of the driven elements (hydraulic actuators) of the shovel 200 that correspond to the automatic driving function.

[0074] The shovel controller 30 may comprehensively control the operation of the entire shovel 200 (various devices mounted on the shovel 200).

[0075] The shovel controller 30 controls the operation of the electric drive system based on various input information (for example, control commands including operation signals from the operating device 26). It may also control the illumination of the indicator 160, which will be described later, based on signals from the battery controller 191. Furthermore, it may control the illumination of the light source 170, which will be described later, based on signals from the open / close detection sensor 3A.

[0076] Furthermore, the shovel controller 30 may, for example, control the switching between the discharge state and the charging state of the battery module 19 based on the operating state of the operating device 26. Also, if the shovel 200 is remotely operated, the shovel controller 30 may, for example, control the switching between the discharge state and the charging state of the battery module 19 based on the content of the remote operation. Furthermore, if the automatic operation function of the shovel 200 is enabled, the shovel controller 30 may, for example, control the switching between the discharge state and the charging state of the battery module 19 based on the operation command corresponding to the automatic operation function.

[0077] Furthermore, the various functional blocks provided in the shovel controller 30 to control the system so that the battery 192 is not charging and the maintenance door 3D (see Figure 5) is not open at the same time will be described later.

[0078] <Cooling system> The cooling system of the Shovel 200 is a group of components designed to cool the heat-generating components that occur during the operation of the Shovel 200.

[0079] As shown in Figure 3, the cooling system of the shovel 200 includes a cooling device 60 and a fan 90.

[0080] The cooling system 60 cools the electric drive system equipment and the relatively high-voltage power supply system equipment in the shovel 200. For example, as shown in Figure 3, the equipment to be cooled by the cooling system 60 includes the pump motor 12, inverter 18, battery module 19, DC-DC converter 44, and charging AC-DC converter 103.

[0081] Furthermore, the connection configuration of the cooling targets through which the refrigerant passes in the refrigerant circuit 66 may be arbitrary, as long as the conditions regarding the required cooling performance for each of the multiple cooling targets are satisfied. For example, the refrigerant circuit 66 may connect some or all of the multiple cooling targets in series, or some or all of them in parallel, as long as the conditions regarding the required cooling performance for each of the multiple cooling targets are satisfied. Also, the arrangement of the multiple cooling targets starting from the radiator 62 may be arbitrary, as long as the conditions regarding the required cooling performance for each of the multiple cooling targets are satisfied.

[0082] The cooling system 60 includes a radiator 62, a water pump 64, and a refrigerant circuit 66.

[0083] The radiator 62 cools the refrigerant (e.g., coolant) in the refrigerant circuit 66. Specifically, the radiator 62 cools the refrigerant by exchanging heat between the refrigerant and the surrounding air.

[0084] The water pump 64 circulates the refrigerant within the refrigerant circuit 66. The water pump 64 is powered, for example, by a DC-DC converter 44 or a battery 46.

[0085] The refrigerant circuit 66 includes refrigerant flow paths 66A, 66B, 66C, 66D, 66E, and 66F.

[0086] The refrigerant flow path 66A connects the water pump 64 and the battery module 19, allowing the refrigerant discharged from the water pump 64 to flow into the refrigerant flow path inside or around the battery module 19. This enables the cooling device 60 to cool the battery module 19 with the refrigerant. The refrigerant that has flowed through the refrigerant flow path inside or around the battery module 19 flows out into the refrigerant flow path 66B.

[0087] Refrigerant passages 66B, 66B1, and 66B2 connect the battery module 19 to the inverter 18 and DC-DC converter 44, allowing refrigerant flowing out of the battery module 19 to flow into the refrigerant passages inside or around the inverter 18 and DC-DC converter 44. Specifically, refrigerant passage 68B, one end of which is connected to the battery module 19, branches at the other end into refrigerant passages 68B1 and 68B2, which are connected to the inverter 18 and DC-DC converter 44, respectively. This allows the inverter 18 and DC-DC converter 44 to be cooled. Refrigerant that has flowed through the refrigerant passages inside or around the inverter 18 flows out into refrigerant passage 68C1. Similarly, refrigerant that has flowed through the refrigerant passages inside or around the DC-DC converter 44 flows out into refrigerant passage 68C2.

[0088] The refrigerant passages 68C, 68C1, and 68C2 connect the inverter 18 and DC-DC converter 44 to the pump motor 12, allowing the refrigerant flowing out from the inverter 18 and DC-DC converter 44 to flow into the refrigerant passage inside or around the pump motor 12. Specifically, the refrigerant passages 68C1 and 68C2, each with one end connected to the inverter 18 and DC-DC converter 44, merge with one end of the refrigerant passage 68C, and the other end of the refrigerant passage 68C is connected to the pump motor 12. This allows the pump motor 12 to be cooled by the refrigerant. The refrigerant that has flowed through the refrigerant circuit inside or around the pump motor 12 flows out into the refrigerant passage 68D.

[0089] Furthermore, if a power converter is provided between the battery module 19 and the pump motor 12, the power converter may be cooled by the cooling device 60. In this case, the power converter may be arranged in parallel with the inverter 18 and the DC-DC converter 44 in the refrigerant circuit 66, for example, and cooled by the refrigerant flowing out from the battery module 19. The DC-DC converter 44 may also be air-cooled. In this case, the refrigerant flow paths 66B2 and 66C2 are omitted. In addition, at least a portion of the inverter 18 and the DC-DC converter 44 may be arranged in series in the refrigerant circuit 66.

[0090] The refrigerant flow path 66D connects the pump motor 12 and the charging AC-DC converter 103, allowing refrigerant flowing out from the refrigerant flow path inside or around the pump motor 12 to flow into the refrigerant flow path inside or around the charging AC-DC converter 103. This allows the cooling device 60 to cool the charging AC-DC converter 103 with refrigerant. The refrigerant that has passed through the refrigerant flow path inside or around the charging AC-DC converter 103 flows out into the refrigerant flow path 66E.

[0091] The refrigerant flow path 66E connects the charging AC-DC converter 103 and the radiator 62, supplying the refrigerant flowing out from the refrigerant flow path inside or around the charging AC-DC converter 103 to the radiator 62. As a result, the refrigerant circuit 66 cools the various components of the electric drive system and power supply system, causing the temperature of the refrigerant to rise, which is then cooled by the radiator 62, returning the various components of the electric drive system and power supply system to a state where they can be cooled again.

[0092] The refrigerant passage 66F connects the radiator 62 and the water pump 64, supplying the refrigerant cooled by the radiator 62 to the water pump 64. As a result, the water pump 64 can discharge the refrigerant cooled by the radiator 62 into the refrigerant passage 66A, allowing it to circulate in the refrigerant circuit 66.

[0093] The fan 90 operates under the control of the shovel controller 30 and blows air toward a predetermined device that exchanges heat with the air (hereinafter referred to as "heat exchange device"). The fan 90 is powered by electricity supplied, for example, from a DC-DC converter 44 or a battery 46.

[0094] The fan 90 may, for example, blow air toward the radiator 62 as shown in Figure 3 to cool the radiator 62. This continuously supplies air around the radiator 62 that can exchange heat with the refrigerant flowing through it, thereby increasing the degree of cooling of the refrigerant by the radiator 62.

[0095] The fan 90 may be one or multiple. In other words, the fan 90 can be configured in any number as long as it can ensure the required degree of heat exchange (cooling or heating) for the heat exchange equipment.

[0096] Furthermore, the cooling system of the Shovel 200 may include an oil cooler for cooling the hydraulic fluid used in the hydraulic drive system (high-pressure hydraulic line) and the operating system (pilot line). The oil cooler may be installed, for example, in the return oil passage between the control valve 17 and the hydraulic fluid tank T, and may cool the hydraulic fluid by exchanging heat between the surrounding air and the hydraulic fluid flowing through it. In this case, the fan 90 may blow air toward the oil cooler to cool it. As a result, air capable of exchanging heat with the hydraulic fluid flowing through it is continuously supplied around the oil cooler, thereby increasing the degree of cooling of the hydraulic fluid by the oil cooler. In this case, the fan 90 that blows air toward the radiator 62 and the fan 90 that blows air toward the oil cooler may be the same fan 90, or they may be different fans 90.

[0097] [Arrangement structure of various equipment in the upper rotating body] Next, with reference to Figure 4, the arrangement structure of various devices in the upper rotating body 3 will be described.

[0098] Figure 4 is a top view showing an example of the arrangement structure of various equipment on the upper rotating body 3. In Figure 4, the housing section 3H (see Figure 5), which is the exterior of the upper rotating body 3, is omitted in order to expose the various equipment on the upper rotating body 3.

[0099] As shown in Figure 4, in this example, the battery module 19 is mounted on the right side of the upper rotating body 3, extending from the front to the center in the longitudinal direction.

[0100] The area extending from the center of the rear of the upper rotating body 3 in the left-right direction (Y-axis direction) to the right end (-Y direction side end) is equipped with a pump motor 12, a main pump 14, a pilot pump 15, a control valve 17, and an inverter 18.

[0101] The pump motor 12 and inverter 18 are integrally arranged in the center of the rear of the upper slewing body 3 in the left-right direction (Y-axis direction). The pump motor 12 and inverter 18 are arranged such that the rotation axis of the pump motor 12 is aligned in the left-right direction (Y-axis direction) and the output shaft extends to the right. For example, the pump motor 12 is mounted on the bottom 3B (slewing frame) of the upper slewing body 3 via a mounting member. Specifically, the pump motor 12 may be positioned relatively close to the bottom 3B so that the positions of the main pump 14 and pilot pump 15, which are connected in a mechanically drivable manner, are as low as possible. This allows the position of the main pump 14 to be lower than the liquid level inside the hydraulic oil tank T. Therefore, the occurrence of air entrapment in the main pump 14 can be suppressed.

[0102] The main pump 14 and pilot pump 15 are positioned adjacent to the right side of the pump motor 12, with their input shafts connected to the output shaft of the pump motor 12. The main pump 14 and pilot pump 15 are mounted on the bottom 3B via the pump motor 12, for example, by being connected to the pump motor 12.

[0103] The control valve 17 is positioned at the center of the rear of the upper slewing body 3 in the left-right direction (Y-axis direction) and above the pump motor 12. For example, the pump motor 12 and the main pump 14 are positioned at a relatively low position in the space between the bottom 3B of the upper slewing body 3 and the housing, while the control valve 17 is positioned at a relatively high position in that space. Specifically, a support frame 17MT is attached to the bottom 3B so as to straddle the pump motor 12 in the front-rear direction (X-axis direction). The control valve 17 is then mounted on the support frame 17MT and thus mounted on the bottom 3B via the support frame 17MT.

[0104] The control valve 17 may be positioned above the main pump 14 or the pilot pump. Alternatively, the control valve 17 may be positioned to straddle the space between the pump motor 12 and the main pump 14 or pilot pump 15 in the left-right direction (Y-axis direction).

[0105] A hydraulic slewing motor 2M is mounted in the center of the upper slewing body 3.

[0106] A hydraulic oil tank T is positioned in the space between the slewing hydraulic motor 2M, the pump electric motor 12, and the control valve 17 in the front-rear direction. The hydraulic oil tank T is mounted on the bottom 3B either directly or via a bracket or the like.

[0107] On the left side (-X direction) of the rear of the upper rotating body 3, that is, to the left of the pump motor 12, the main pump 14, and the control valve 17, a radiator 62 and a fan 90 are positioned.

[0108] The radiator 62 is positioned approximately perpendicular to the base 3B, with its longitudinal direction (width direction) being approximately perpendicular to the base 3B, and its lateral direction (Y direction) being approximately perpendicular to the base 3B. The term "approximately" is intended to allow for manufacturing tolerances, for example, in the shovel 200 or the equipment mounted on the shovel 200. The same intention will be used hereafter. This allows the radiator 62 to perform heat exchange by introducing air between the fins of the core and passing the air in the lateral direction (Y direction). The radiator 62 is attached to the base 3B, for example, via a mounting member.

[0109] The fan 90 is positioned adjacent to the right side (+Y direction) of the radiator 62. The fan 90 is mounted on the bottom 3B via the radiator 62, for example, by being attached to the radiator 62 via a resin fan shroud. The fan 90 is arranged, for example, in two rows along the longitudinal direction (X-axis direction) and two rows in the height direction (Z-axis direction) of the radiator 62. The fan 90 blows air onto the radiator 62, etc., by drawing air from the radiator 62 side (-Y direction) to the right side (+Y direction).

[0110] The fan 90 may be positioned adjacent to the left side of the radiator 62, etc. In this case, the fan 90 blows air towards the radiator 62, etc., from the left side towards the radiator 62 (right side).

[0111] The battery 46 is located at the rear left end of the upper rotating body 3, that is, to the left of the radiator 62 and the fan 90.

[0112] The battery 46 is attached to the bottom 3B, for example, via a bracket or the like. On the left side (+Y direction side) of the cabin 10 of the upper rotating body 3, there is a vehicle inlet 101 for normal charging and a vehicle inlet 102 for rapid charging. The vehicle inlet 101 for normal charging and the vehicle inlet 102 are arranged side by side, for example, in the front-to-back direction (X-axis direction). A DC-DC converter 44 and a charging AC-DC converter 103 are also arranged inside the cabin 10.

[0113] The vehicle inlet 101 for standard charging (an example of a charging port) can be connected to a charging connector. The vehicle inlet 102 for rapid charging (an example of a charging port) can be connected to a charging connector.

[0114] As shown in Figure 4, an openable and closable outer flap 150 is provided on the left side (side in the -Y direction) of the upper rotating body 3. Inside the space 155 when the outer flap 150 is opened, there is a first inner flap 151 that covers the vehicle inlet 101 for normal charging and a second inner flap 152 that covers the vehicle inlet 102 for rapid charging.

[0115] The first inner flap 151 and the second inner flap are openable and closable. For example, when connecting a charging connector to the vehicle inlet 101 for normal charging, the first inner flap 151 is opened. Furthermore, when connecting a charging connector to the vehicle inlet 102 for rapid charging, the second inner flap 152 is opened.

[0116] In this embodiment, the upper slewing body 3 is configured such that, when viewed from above, its rear end is approximately arc-shaped with respect to the pivot center (axis) 3X. This allows the slewing radius of the rear of the upper slewing body 3 to be relatively small. The slewing radius of the rear of the upper slewing body 3 refers to the radius of the trajectory (outer edge) traced by the rear of the upper slewing body 3 when it rotates, with respect to the pivot center 3X. The shovel 200 is, for example, a rear-extending ultra-short-slewing type shovel. A rear-extending ultra-short-slewing type shovel means a shovel in which the ratio of the slewing radius of the rear of the upper slewing body 3 to half (1 / 2) of the total width of the crawler 1C is within 120 percent. This allows the shovel 200 to improve workability in confined work sites.

[0117] On the other hand, in the case of a rear-extending ultra-short swing excavator, the space at the rear (-X direction) of the upper swing body 3, especially the space at the left and right (Y-axis direction) ends, is reduced and becomes relatively smaller. Furthermore, as electrification is progressing, especially in small machines, even in electric excavators 200 that are not rear-extending ultra-short swing excavators, the space at the rear of the upper swing body 3 is inherently limited and tends to be relatively small. Therefore, if relatively large components are placed at the rear of the upper swing body 3, it may increase dead space and make it impossible to achieve an efficient arrangement structure for the components.

[0118] Therefore, in this embodiment, the battery module 19, which is one of the largest components mounted on the upper slewing body 3, is placed on the front right side (-Y direction side) of the upper slewing body 3. The front right side is roughly rectangular in shape. The battery module 19 is formed in a shape corresponding to the front right side. The electric motor 12 for the pump and the main pump 14 are mounted on the rear of the upper slewing body 3.

[0119] As a result, the shovel 200 can relatively reduce dead space by positioning the relatively small pump motor 12 and main pump 14, etc., at the rear of the upper rotating body 3. Furthermore, the shovel 200 can secure a relatively large placement space for the battery module 19 along the right side of the upper rotating body 3, where the lateral position changes are small in the front-to-back direction (X-axis direction) when viewed from above. Therefore, the shovel 200 can achieve an efficient arrangement structure for the components of the upper rotating body 3, including the battery module 19.

[0120] As a result, the shovel 200 can secure space above the main pump 14 and the pump motor 12, which have relatively small height dimensions, as space for the control valve 17. In addition, because the control valve 17 supplied from the main pump 14 is positioned relatively close to the main pump 14, the hydraulic fluid piping can be made relatively shorter. Therefore, the shovel 200 can achieve a more efficient arrangement structure of components in the upper rotating body 3.

[0121] As a result, the shovel 200 can secure a relatively large capacity for the battery module 19, while positioning the relatively small main pump 14 behind the battery module 19, thereby reducing the front-to-back dimensions at the rear right corner (right end) of the upper rotating body 3. Therefore, the shovel 200 can achieve both securing the capacity of the battery module 19 and reducing the turning radius of the rear of the upper rotating body 3.

[0122] Furthermore, in this embodiment, a maintenance door 3D may be provided at the rear of the housing section 3H of the upper rotating body 3, allowing access to the components mounted on the upper rotating body 3.

[0123] As a result, workers can easily access the group of components, which are relatively small compared to the battery module 19, and are concentrated at the rear of the upper rotating body 3, as described above.

[0124] [Description of maintenance door and opening / closing detection sensor] Figure 5 is a perspective view showing an example of a maintenance door 3D of the upper rotating body 3. In the example shown in Figure 5, three maintenance doors 3D are provided at the rear of the upper rotating body 3 (house section 3H).

[0125] In this embodiment, as described above, the relatively large battery module 19 is located at the front right side of the upper rotating body 3, while the relatively smaller components are concentrated at the rear of the upper rotating body 3. Therefore, workers can easily access these components through the maintenance door 3D.

[0126] Maintenance doors 3D (an example of an openable / closable cover) include maintenance doors 3D1 to 3D3 and are provided as part of the exterior of the shovel 200, and are opened when performing maintenance on the shovel 200.

[0127] The maintenance door 3D1 is located in the left-right center of the rear of the housing section 3H and can be opened upward using the left-right axis on the upper surface of the housing section 3H as a pivot point. This allows workers to access the pump motor 12, control valve 17, inverter 18, and hydraulic oil tank T, etc., through the opening of the maintenance door 3D1 and perform various maintenance tasks. In particular, workers can easily perform maintenance such as refueling the hydraulic oil tank T, which has a relatively high need and frequency of maintenance.

[0128] The maintenance door 3D2 is located on the left side of the rear of the housing section 3H and can be opened to the left, pivoting on the vertical axis of the side of the housing section 3H. This allows workers to access the battery 46, radiator 62, and (not shown) air conditioning equipment through the opening of the maintenance door 3D2 and perform various maintenance tasks.

[0129] The maintenance door 3D3 is located on the rightmost side of the rear of the housing section 3H and can be opened to the left, pivoting on the vertical axis of the side of the housing section 3H. This allows workers to access the main pump 14, pilot pump 15, and nearby components through the opening of the maintenance door 3D3 and perform various maintenance tasks. In particular, workers can easily perform maintenance on filters located near the main pump 14 (for example, the working oil filter 3F and the fuel main filter), which have a relatively high need and frequency of maintenance.

[0130] As described above, maintenance doors 3D1 to 3D3 are opened when performing maintenance on the group of parts located at the rear of the upper rotating body 3.

[0131] Incidentally, when the shovel 200 is charging the battery 192, especially when performing rapid charging, the shovel controller 30 controls various configurations to cool the battery 192. For example, the shovel controller 30 operates the cooling device 60 shown in Figure 3 to cool the battery module 19. In this case, the shovel controller 30 operates the water pump 64 to circulate the refrigerant flowing through the refrigerant passages 66A to 66F, and also operates the fan 90.

[0132] The refrigerant passages 66A to 66F are also located at the rear of the upper swirl body 3 as passages for cooling the pump motor 12 and the inverter 18, etc. Therefore, the refrigerant that has become hot from cooling the battery module 19 may pass through the refrigerant passages 66B to 66F located at the rear of the upper swirl body 3. In addition, the battery 46 may be charged while the battery 192 is being charged. In this case, the battery 46 may also become hot.

[0133] Therefore, when a worker performs maintenance with one or more of the maintenance doors 3D1 to 3D3 open while the battery module 19 is charging, there is a possibility that the worker's body parts may come into contact with hot components or refrigerant passages 66A to 66F.

[0134] Furthermore, while the battery module 19 is charging, the fan 90 rotates to blow air onto the radiator 62 in order to cool the refrigerant of the cooling device 60.

[0135] Therefore, when a worker performs maintenance with the maintenance doors 3D1 and 3D2 open while the battery module 19 is charging, there is a possibility that a part of the worker's body may come into contact with the rotating fan 90.

[0136] Therefore, the excavator controller 30 according to this embodiment controls the system so that the state in which the battery module 19 is being charged from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 and the state in which the maintenance doors 3D1 to 3D3 are open do not occur simultaneously.

[0137] Therefore, at the rear of the upper rotating body 3, open / close detection sensors 3A1 to 3A3 are provided to detect the open / closed state of each of the maintenance doors 3D1 to 3D3.

[0138] The open / close detection sensors 3A1 to 3A3 are sensors that detect the open / closed state of the maintenance doors 3D1 to 3D3. For example, the open / close detection sensors 3A1 to 3A3 may use lever-type electric switches that are not pushed down when the maintenance doors 3D1 to 3D3 are open, but are pushed down when they are closed. The open / close detection sensors 3A1 to 3A3 then output a signal to the shovel controller 30 indicating whether or not they are in the pushed-down state. This allows the shovel controller 30 to understand the open / closed state of the maintenance doors 3D1 to 3D3.

[0139] Specifically, the opening / closing detection sensor 3A1 detects whether the maintenance door 3D1 is closed or not, and transmits a signal indicating the detection result to the shovel controller 30.

[0140] The open / close detection sensor 3A2 detects whether the maintenance door 3D2 is closed or not, and transmits a signal indicating the detection result to the shovel controller 30.

[0141] The open / close detection sensor 3A3 detects whether the maintenance door 3D3 is closed or not, and transmits a signal indicating the detection result to the shovel controller 30.

[0142] This embodiment is not limited to the use of lever-type (contact-type) sensors as the opening / closing detection sensors 3A1 to 3A3. For example, magnetic sensors that detect opening and closing using magnets provided on the maintenance doors 3D1 to 3D3 may be used as the opening / closing detection sensors 3A1 to 3A3. Furthermore, an imaging device may be used as the opening / closing detection sensor 3A. When an imaging device is used, the opening / closing detection sensor 3A is positioned so that it can recognize whether each of the maintenance doors 3D1 to 3D3 is in the open state or not, after performing predetermined image processing on the input image.

[0143] [Conditions surrounding the shovel when charging] Next, we will describe the situation when the charging connector 400 is connected to the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging.

[0144] Figure 6 is a front view showing the external appearance of the shovel 200 according to this embodiment.

[0145] The example shown in Figure 6 illustrates the situation of charging the shovel 200. Specifically, it shows the situation with the outer flap 150 open, and the charging connector 400 connected to either the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, which are stored inside the outer flap 150. The charging connector 400 is connected to an external power source via the charging cable 401.

[0146] In the excavator 200 according to this embodiment, a standard charging vehicle inlet 101 and a rapid charging vehicle inlet 102 are provided in the space between the bottom 3B (swing frame) of the upper slewing body 3 and the floor surface of the cabin 10. In other words, the standard charging vehicle inlet 101 and the rapid charging vehicle inlet 102 are provided at an ergonomically convenient height, thereby reducing the burden on the operator when connecting the charging connector 400.

[0147] In this embodiment, when a worker connects the charging connector 400 to the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 to start charging, the shovel controller 30 according to this embodiment detects from signals from the open / close detection sensors 3A1 to 3A3 that one or more of the maintenance doors 3D1 to 3D3 are open, and controls the battery module 19 so as not to be charged.

[0148] By the way, if a worker is located in the position shown in Figure 6, the worker cannot confirm whether the maintenance doors 3D1 to 3D3 are open or not. Therefore, the shovel controller 30 according to this embodiment notifies the worker whether the maintenance doors 3D1 to 3D3 are open or not. In this embodiment, whether one or more of the maintenance doors 3D1 to 3D3 are open or not is displayed inside when the outer flap 150 is opened.

[0149] [Explanation of the charging port] Next, the space 155 after opening the outer flap 150 in the excavator 200 according to this embodiment will be described. Figure 7 is a diagram showing the arrangement of each component in the internal space 155 after opening the outer flap 150 according to this embodiment. As shown in Figure 7, in the internal space 155 after opening the outer flap 150, a first inner flap 151, a second inner flap 152, an indicator 160 for indicating the charge level, and a light source 170 for indicating whether or not the maintenance door 3D is open are arranged.

[0150] When the first inner flap 151 is opened, the vehicle inlet 101 for normal charging is revealed and ready for connection. When the second inner flap 152 is opened, the vehicle inlet 102 for rapid charging is revealed and ready for connection.

[0151] The indicator 160 is equipped with, for example, three LEDs. The indicator 160 switches its display according to the charge level, according to the control of the shovel controller 30. For example, when the SOC is 0%, all LEDs are off. When the SOC is 50%, the first LED is lit, the second LED is blinking, and the third LED is off. When the SOC is 75%, the first and second LEDs are lit, and the third LED is blinking. When the SOC is 100%, all LEDs are lit. By referring to the indicator 160, the operator can determine whether or not it is safe to disconnect the charging connector 400 from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102.

[0152] In this embodiment, indicators 160 are provided near the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging, so that the operator can check the State of Charge (SOC) and then decide whether or not to disconnect the charging connector 400. Since the charging connector 400 can be disconnected only after confirming that the SOC of the battery module 19 has reached a predetermined standard, it is possible to prevent a reduction in the working time of the shovel 200.

[0153] In this embodiment, an example was described using an indicator 160 with three LEDs as a display device for showing the charge level. However, this embodiment does not limit the display device to an indicator 160 with three LEDs; four or more LEDs, or two or fewer LEDs, may be used. Furthermore, a liquid crystal panel or the like may be used as the display device. In this way, any display device that can display the charge level may be used.

[0154] The light source 170 (an example of a display device) is equipped with, for example, one LED. The light source 170 lights up or turns off according to the control from the shovel controller 30, depending on whether the maintenance doors 3D1 to 3D3 are open or not. For example, if one or more of the maintenance doors 3D1 to 3D3 are open, the light source 170 lights up, and if all of the maintenance doors 3D1 to 3D3 are closed, the light source 170 turns off.

[0155] In this embodiment, since a light source 170 is provided near the vehicle inlet 101 for normal charging and the vehicle inlet 102 for rapid charging, the operator can check whether the maintenance doors 3D1 to 3D3 are open or not, and thus recognize whether or not charging will start when the charging connector 400 is connected.

[0156] Furthermore, in this embodiment, the vehicle inlet 101 for normal charging, the vehicle inlet 102 for rapid charging, and the light source 170 are located near the door 10A. Therefore, the open / closed status of the maintenance doors 3D1 to 3D3 can be checked without having to walk to the rear of the shovel 200. This reduces the burden of walking for the worker.

[0157] <Excavator Controller Function Blocks> Returning to Figure 2, let's describe each functional block within the shovel controller 30. Each functional block within the shovel controller 30 is conceptual and does not necessarily need to be physically configured as shown in the figure. It is possible to configure all or part of each functional block by distributing and integrating them functionally or physically in any unit. Each processing function performed in each functional block is realized, all or any part thereof, by a program executed on the CPU. Alternatively, each functional block may be realized as hardware using wired logic.

[0158] The excavator controller 30 according to this embodiment controls the system so that the state in which the battery 192 is being charged from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 and the state in which the maintenance door 3D (see Figure 5) is open do not occur simultaneously. Therefore, the excavator controller 30 according to this embodiment includes, as functional blocks, an acquisition unit 3001, a determination unit 3002, an output unit 3003, and a control unit 3004.

[0159] The acquisition unit 3001 acquires signals from various components within the shovel 200. For example, the acquisition unit 3001 acquires signals indicating the detection results of the open / close detection sensors 3A1 to 3A3.

[0160] Furthermore, the acquisition unit 3001 acquires signals from the battery controller 191 indicating whether or not the SOC and charging connector 400 are connected.

[0161] The determination unit 3002 performs various determinations based on the information acquired by the acquisition unit 3001. For example, the determination unit 3002 determines whether or not one or more of the maintenance doors 3D1 to 3D3 are open, based on the detection results of the open / close detection sensors 3A1 to 3A3.

[0162] Furthermore, the determination unit 3002 determines whether the State of Charge (SOC) of the battery 192 has reached a predetermined reference value (for example, 100%) or higher while the battery 192 is being charged.

[0163] The output unit 3003 controls the output of information to workers, etc. For example, the output unit 3003 outputs warnings based on the judgment results of the judgment unit 3002. Furthermore, the output unit 3003 also outputs information based on the information acquired by the acquisition unit 3001.

[0164] For example, the output unit 3003 controls the display of the indicator 160 based on the State of Charge (SOC) of the battery 192.

[0165] Furthermore, the output unit 3003 controls the lighting of the light source 170 based on whether or not one or more of the maintenance doors 3D1 to 3D3 are open, as determined by the determination unit 3002. Specifically, the output unit 3003 lights up the light source 170 when one or more of the maintenance doors 3D1 to 3D3 are open, and turns off the light source 170 when all of the maintenance doors 3D1 to 3D3 are closed.

[0166] This embodiment provides an example in which the state of whether one or more of the maintenance doors 3D1 to 3D3 are open is indicated by turning the light source 170 on or off. However, this embodiment is not limited to controlling the lighting of the light source 170 to indicate whether one or more of the maintenance doors 3D1 to 3D3 are open; any method that allows the worker to recognize whether they are open or not is acceptable. For example, information indicating that one or more of the maintenance doors 3D1 to 3D3 are open may be displayed on a liquid crystal panel.

[0167] Furthermore, when controlling charging, the output unit 3003 also outputs an audible warning if one or more of the maintenance doors 3D1 to 3D3 are open. Note that this embodiment does not limit the warning output to audible; for example, the output unit 3003 may output a warning to a communication terminal carried by the worker, or it may output a warning by turning on a light source other than the light source 170. Furthermore, the output unit 3003 may output a warning to a management center that manages the work site.

[0168] Based on the determination result from the determination unit 3002, the control unit 3004 controls the system so that the state in which the battery 192 is being charged from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 and the state in which the maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) are open do not occur simultaneously.

[0169] This embodiment is an example in which three maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) are provided. Therefore, the control unit 3004 in this embodiment controls the system so that the state in which the battery 192 is being charged and the state in which at least one of the maintenance doors 3D1 to 3D3 is open do not occur simultaneously.

[0170] This embodiment describes an example in which three maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) are provided. However, the number of maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) is not limited to three; there may be two or fewer, or four or more.

[0171] For example, if the control unit 3004 determines that any one of the maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) is open, it instructs the battery controller 191 to suppress the start of charging.

[0172] Another example is when the control unit 3004 determines that one of the maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) is open while charging the battery 192, it instructs the battery controller 191 to stop charging the battery 192.

[0173] In this embodiment, the excavator controller 30 controls the battery 192 to suppress charging if it is determined that any one of the maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) is open when charging of the battery 192 is started or in progress. This prevents the components inside the maintenance doors 3D1 to 3D3 from overheating when the maintenance doors 3D1 to 3D3 are open. In other words, it prevents the fan 90 from rotating irregularly or the refrigerant (e.g., cooling water) in the refrigerant circuit 66 from flowing irregularly due to the components inside the maintenance doors 3D1 to 3D3 overheating. As a result, in this embodiment, it is possible to prevent the fan 90 from suddenly starting or the refrigerant (e.g., cooling water) from blowing out when an operator is performing maintenance. Furthermore, it is possible to suppress the charging of the battery 192 when disassembling electrical components that may conduct electricity. Therefore, safety can be improved.

[0174] <Charging control flow> Next, the processes performed during charge control in the shovel 200 according to this embodiment will be described.

[0175] Figure 8 is a flowchart showing the process when the shovel controller 30 according to this embodiment charges the battery 192.

[0176] First, the determination unit 3002 determines whether the charging connector 400 is connected or not based on the information from the battery controller 191 acquired by the acquisition unit 3001 (S1801). If it determines that the charging connector 400 is not connected (S1801: No), it performs the S1801 process again.

[0177] On the other hand, if the system determines that the charging connector 400 is connected (S1801: Yes), the determination unit 3002 determines whether all maintenance doors 3D1 to 3D3 are closed based on the detection results obtained by the acquisition unit 3001 (S1802). If the determination unit 3002 determines that they are not all closed (S1802: No), the output unit 3003 outputs an audible warning indicating that the maintenance doors 3D1 to 3D3 are open (S1803). At this time, the control unit 3004 instructs the battery controller 191 to suppress the start of charging, and then processes again from S1801, thereby suppressing the start of charging of the battery 192. The output unit 3003 also controls the lighting of the light source 170. Note that the lighting control of the light source 170 may be performed regardless of whether the charging connector 400 is connected or not.

[0178] On the other hand, if the determination unit 3002 determines that all maintenance doors 3D1 to 3D3 are closed (S1802: Yes), the control unit 3004 instructs the battery controller 191 to start charging the battery 192 (S1804).

[0179] Subsequently, the determination unit 3002 determines whether one or more of the rear maintenance doors 3D1 to 3D3 have opened based on the detection results acquired by the acquisition unit 3001 (S1805). If the determination unit 3002 determines that one or more of the doors have opened (S1805: Yes), the output unit 3003 outputs an audible warning indicating that the maintenance doors 3D1 to 3D3 are open (S1806). At this time, the output unit 3003 also controls the lighting of the light source 170.

[0180] Subsequently, the control unit 3004 instructs the battery controller 191 to stop charging the battery 192 (S1807). This stops the charging of the battery 192.

[0181] Subsequently, the determination unit 3002 determines whether all of the rear maintenance doors 3D1 to 3D3 have closed based on the detection results acquired by the acquisition unit 3001 (S1808). If it is determined that they have not all closed (S1808: No), the output unit 3003 continues to output an audible warning while the battery 192 is stopped charging.

[0182] On the other hand, if the determination unit 3002 determines that all of the rear maintenance doors 3D1 to 3D3 have closed (S1808: Yes), the control unit 3004 will again perform control to resume charging of the battery 192 (S1804).

[0183] In S1805, if the determination unit 3002 determines, based on the detection results acquired by the acquisition unit 3001, that all maintenance doors 3D1 to 3D3 are closed (S1805: No), the control unit 3004 continues the charging control of the battery 192 (S1809).

[0184] The determination unit 3002 then determines whether the State of Charge (SOC) of the battery 192, obtained from the battery controller 191, is equal to or greater than a predetermined reference value (for example, 100%) (S1810). If it determines that the SOC is less than the predetermined reference value (S1810: No), the process returns to S1805.

[0185] On the other hand, if the determination unit 3002 determines that the State of Charge (SOC) of the battery 192 is equal to or greater than a predetermined reference value (for example, 100%) (S1810: Yes), the control unit 3004 instructs the battery controller 191 to stop charging the battery 192 (S1811). As a result, charging of the battery 192 is completed.

[0186] In this embodiment, by performing the above-described process, battery 192 charging control is performed only when all maintenance doors 3D1 to 3D3 are closed, thereby improving safety.

[0187] In the above-described embodiment, we explained the case where a warning is output and charging is stopped if one or more of the maintenance doors 3D1 to 3D3 are opened during charging. However, this embodiment is not limited to the case where both a warning is output and charging is stopped; a warning may be output only, or charging may be stopped only.

[0188] In this embodiment, the case where the criterion value for ending battery charging of 192 is 100% has been described. However, this embodiment does not limit the criterion value for ending battery charging to 100%, but rather sets an appropriate value considering the amount of work performed by the shovel 200 and the lifespan of the battery 192.

[0189] In this embodiment, even if at least one of the multiple maintenance doors 3D is open, the system is controlled so that this does not occur simultaneously with the battery 192 being charged. This prevents the worker from accessing the inside of the shovel 200 while it is charging. Therefore, when the worker is accessing the inside of the shovel 200, it is possible to prevent the fan 90 from rotating intermittently or the refrigerant (e.g., cooling water) from intermittently flowing through the refrigerant circuit 66 due to the charging of the battery 192. Furthermore, it is possible to prevent the worker from coming into contact with parts that are driven by the charging. This improves safety.

[0190] In this embodiment, the shovel controller 30 suppresses the start of charging to the battery 192 even when the conditions for starting charging of the battery 192 are met, as long as at least one of the multiple maintenance doors 3D is open. In other words, when the maintenance door 3D is open, the shovel controller 30 suppresses charging, thereby preventing the fan 90 from rotating intermittently or the refrigerant (e.g., cooling water) in the refrigerant circuit 66 from starting to flow intermittently due to the internal components overheating caused by the start of battery charging while an operator is performing maintenance, and also suppresses the movement of components due to charging. This improves safety.

[0191] In this embodiment, the excavator controller 30 stops charging the battery 192 if at least one of the multiple maintenance doors 3D is opened while the battery 192 is being charged. This prevents the fan 90 from rotating irregularly or the refrigerant (e.g., cooling water) in the refrigerant circuit 66 from starting to flow irregularly after at least one of the multiple maintenance doors 3D is opened, thereby improving safety. Furthermore, the excavator controller 30 outputs a warning if at least one of the multiple maintenance doors 3D is opened while the battery 192 is being charged. This prompts the operator to close the maintenance doors 3D, thereby improving safety.

[0192] (Second embodiment) In the above-described embodiment, an example was explained in which charging is stopped and a warning is issued if the maintenance door 3D is opened during charging, thereby controlling the system so that the state of charging the battery 192 and the state of the maintenance door 3D being open cannot occur simultaneously. However, the above-described embodiment is not limited to the example in which charging is stopped and a warning is issued when the maintenance door 3D is opened. In the second embodiment, a case is described in which lock control is performed to prevent the maintenance door 3D from being opened when charging is started.

[0193] In this embodiment, a locking mechanism 3L (an example of a fixing mechanism) is provided at the rear of the upper rotating body 3, which allows each of the maintenance doors 3D1 to 3D3 to be locked in the closed position. For example, the locking mechanism 3L (3L1 to 3L3) is provided for each of the maintenance doors 3D1 to 3D3.

[0194] In this embodiment, the locking mechanism 3L (3L1 to 3L3) could be, for example, a solenoid lock. However, this embodiment does not limit the locking mechanism 3L (3L1 to 3L3) to a solenoid lock; for example, a mechanical lock may also be used.

[0195] The control unit 3004 outputs a signal to each of the locking mechanisms 3L (3L1 to 3L3) to lock or unlock them. For example, when the control unit 3004 receives information from the battery controller 191 that the battery 192 should be charged, it outputs a signal to each of the locking mechanisms 3L (3L1 to 3L3) to lock (fix) the maintenance doors 3D1 to 3D3 in the closed position.

[0196] Figure 9 illustrates the locking mechanism of the maintenance door 3D according to this embodiment. In the example shown in Figure 9, the locking mechanism 3L is provided adjacent to the open / close detection sensor 3A in the left-right direction (Y-axis direction: depth direction in Figure 9). Note that this embodiment does not restrict the position of the locking mechanism 3L; it can be any position on the maintenance door 3D that is lockable.

[0197] In the example shown in Figure 9(A), the maintenance door 3D is shown in the open position. In this case, the lever-type projection of the open / close detection sensor 3A protrudes in the +Z axis direction, so the open / close detection sensor 3A outputs a signal to the excavator controller 30 indicating that the maintenance door 3D is in the open position.

[0198] Furthermore, the bottom surface 3D_B of the maintenance door 3D has a hole provided at a position corresponding to the locking mechanism 3L.

[0199] The example shown in Figure 9(B) shows the maintenance door 3D in the closed state. In this case, the projection of the opening / closing detection sensor 3A is pushed down in the -Z axis direction, so the opening / closing detection sensor 3A outputs a signal to the shovel controller 30 indicating that the maintenance door 3D is in the closed state.

[0200] This allows the shovel controller 30 to recognize that the maintenance door 3D is closed. When the shovel controller 30 receives notification from the battery controller 191 that charging has started, it instructs the lock mechanism 3L to perform lock control. In accordance with this control, the lock mechanism 3L extends its projection 3L_P in the +Z axis direction. The projection 3L_P is inserted into a hole provided in the bottom surface 3D_B of the maintenance door 3D. This locks (fixes) the maintenance door 3D in the closed position.

[0201] <Charging control flow> Next, the processes performed during charge control in the shovel 200 according to this embodiment will be described.

[0202] Figure 10 is a flowchart showing the process when the shovel controller 30 according to this embodiment charges the battery 192.

[0203] First, the determination unit 3002 determines whether the charging connector 400 is connected or not based on the information from the battery controller 191 acquired by the acquisition unit 3001 (S1901). If it determines that the charging connector 400 is not connected (S1901: No), it performs the S1901 process again.

[0204] On the other hand, if the system determines that the charging connector 400 is connected (S1901: Yes), the determination unit 3002 determines whether all maintenance doors 3D1 to 3D3 are closed based on the detection results obtained by the acquisition unit 3001 (S1902). If the determination unit 3002 determines that they are not all closed (S1902: No), the output unit 3003 outputs an audible warning indicating that the maintenance doors 3D1 to 3D3 are open (S1903). At this time, the control unit 3004 instructs the battery controller 191 to suppress the start of charging, and then processes again from S1901, thereby suppressing the start of charging of the battery 192. The output unit 3003 also controls the lighting of the light source 170. Note that the lighting control of the light source 170 may be performed regardless of whether the charging connector 400 is connected or not.

[0205] On the other hand, if the determination unit 3002 determines that all maintenance doors 3D1 to 3D3 are closed (S1802: Yes), the control unit 3004 outputs a signal to each of the locking mechanisms 3L (3L1 to 3L3) to lock (fix) the maintenance doors 3D1 to 3D3 in the closed position (S1904).

[0206] The control unit 3004 instructs the battery controller 191 to start charging the battery 192 (S1905).

[0207] The determination unit 3002 then determines whether the State of Charge (SOC) of the battery 192, obtained from the battery controller 191, is equal to or greater than a predetermined reference value (for example, 100%) (S1906). If it is determined that the SOC is less than the predetermined reference value (S1906: No), the process is repeated starting from S1906.

[0208] On the other hand, if the determination unit 3002 determines that the State of Charge (SOC) of the battery 192 is equal to or greater than a predetermined reference value (for example, 100%) (S1906: Yes), the control unit 3004 instructs the battery controller 191 to stop charging the battery 192 (S1907). As a result, charging of the battery 192 is completed.

[0209] In this embodiment, the shovel controller 30 controls the lock mechanism 3L to fix the multiple maintenance doors 3D in a closed position when charging the battery 192. This prevents the operator from opening the maintenance doors 3D during charging, thus preventing the maintenance doors 3D from being open when the fan 90 starts rotating intermittently due to the charging of the battery 192. Alternatively, it prevents the maintenance doors 3D from being open when the refrigerant flowing through the refrigerant circuit 66 is blown out due to the charging of the battery 192. This improves safety. Furthermore, it prevents the charging from stopping due to the operator opening the maintenance doors 3D. This prevents delays in the time until the end of charging.

[0210] (modified version) In the embodiments described above, an example was explained in which control is performed so that one or more of the three maintenance doors 3D do not open during charging. However, the embodiments described above are not limited to control that keeps all maintenance doors 3D closed while the battery 192 is being charged.

[0211] Therefore, in this modified example, a maintenance door is provided to access a space where the fan 90, components driven by charging, or refrigerant passages 66A to 66F are not located, and where components requiring maintenance are located. As a method for providing such a maintenance door, the arrangement of the group of components concentrated at the rear of the upper rotating body 3 may be adjusted so that one of the three maintenance doors 3D can be opened even while charging is in progress. Alternatively, the number of maintenance doors 3D may be increased, for example, by providing a maintenance door 3D for replacing filters, etc.

[0212] In this modified example, a dedicated maintenance door is provided among the multiple 3D maintenance doors, which can be opened even while charging.

[0213] Furthermore, the control unit 3004 in this modified example controls the system so that the state in which a maintenance door other than the dedicated maintenance door is open, and the state in which the battery 192 is being charged from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, do not occur simultaneously. As for the control method, either one of the charging stop and warning outputs may be performed as in the first embodiment, or the system may be locked in the closed state as in the second embodiment.

[0214] Furthermore, the control unit 3004 in this modified example controls charging the battery 192 from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, regardless of whether the dedicated maintenance door among the multiple maintenance doors 3D is open or closed. For this reason, this modified example does not require an open / close detection sensor on the dedicated maintenance door.

[0215] In this modified example, among the multiple maintenance doors 3D, the maintenance doors other than the dedicated maintenance door are controlled in the same way as in the embodiment described above, while the dedicated maintenance door can be opened and closed even during charging. The dedicated maintenance door is safe even when opened during charging. Therefore, maintenance such as filter replacement can be performed safely even during charging. This makes it possible to achieve both safety and convenience.

[0216] Furthermore, this does not limit the number of dedicated maintenance doors that can be opened while charging; the number of dedicated maintenance doors may be one or more.

[0217] <effect> In the embodiments and modifications described above, the shovel controller 30 controls the system so that the state in which the battery 192 is being charged from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 and the state in which the maintenance doors 3D1 to 3D3 (an example of an openable / closable cover) are open cannot occur simultaneously. This prevents workers from coming into contact with parts that have become hot due to the charging of the battery 192 or parts that are driven by the charging. This improves safety.

[0218] In the embodiments and modifications described above, when the shovel controller 30 charges the battery 192 from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102, it outputs a warning according to the open / closed state of the maintenance doors 3D1 to 3D3 (an example of an open / closed cover). This allows the operator to recognize the current situation and take appropriate action, thereby improving safety.

[0219] Although embodiments have been described in detail above, this disclosure is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist described in the claims. [Explanation of symbols]

[0220] 200 Shovel 1. Lower running body 2. Swivel mechanism 3. Upper rotating body 3A Open / Close Detection Sensor 3D Maintenance Door 3L locking mechanism 4 Boom 5 Arms 6 buckets 7 Boom Cylinder 8 Arm Cylinder 9 Bucket Cylinder 10 cabins 19 Battery Modules 191 Battery Controller 192 batteries 30 Shovel Controller 90 Fans 101 Vehicle inlet for standard charging 102 Vehicle inlet for rapid charging 160 Indicators 170 light source 3001 Acquisition Department 3002 Judgment section 3003 Output section 3004 Control Unit

Claims

1. Battery and An electric excavator having a charging port for supplying power to the aforementioned battery, A cover is provided as the exterior of the electric excavator and is an openable / closable cover that is opened when performing maintenance on the electric excavator, A fixing mechanism that allows the aforementioned openable / closable cover to be fixed in the closed position, The system includes a control device that controls the system so that the state of charging the battery through the charging port and the state of the open / close cover are not simultaneously occurring. When the control device charges the battery, it controls the fixing mechanism to fix the open / closed cover in a closed position. Electric excavator.

2. When the aforementioned retractable cover is open, the system is configured to suppress the start of charging to the battery. The electric excavator according to claim 1.

3. If the retractable cover is opened while the battery is being charged, the system is configured to stop charging the battery and to output a warning, at least one of the following: The electric excavator according to claim 1 or 2.

4. The charging port is further located near a display device. When the aforementioned retractable cover is open, the display device is configured to show that the retractable cover is open. An electric excavator according to any one of claims 1 to 3.

5. The system has multiple openable and closable covers, Control is performed so that at least one of the multiple open / closed covers is open and the battery is being charged through the charging port does not occur simultaneously. An electric shovel according to any one of claims 1 to 4.

6. The system has multiple openable and closable covers, Control is performed so that the state in which one of the multiple openable / closed covers is open and the state in which the battery is being charged from the charging port do not occur simultaneously. The system is configured to control charging of the battery from the charging port, regardless of whether the other of the aforementioned openable / closable covers is open or closed. An electric shovel according to any one of claims 1 to 4.

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