JP2023100482A - Electric shovel - Google Patents

Abstract

To provide an electric shovel with improved usability.SOLUTION: An electric shovel according to an embodiment of the present disclosure is provided with a switchover part switching over between supplying and not supplying power supplied from an outer power source to electronic parts, being configured to control the switchover part such that the electronic parts are activated using the power supplied from the outer power source when determining a state the power supply is allowed from the outer power source after determining whether or not the electric shovel is in the state allowed to be supplied with the power supply from the outer power source.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to electric excavators.

Conventionally, excavators may be equipped with batteries that power multiple electrical loads. In the excavator, the battery is charged by supplying power from an external charging facility.

Japanese Patent No. 5271500

Situations exist where one wishes to power an electrical load (eg, an electronic component) within the excavator when the excavator's battery is powered by an external charging facility. In this situation, it is desirable to be able to appropriately switch whether or not to supply the electric power supplied from the external facility to the electric load.

To achieve the above object, an electric excavator according to an embodiment of the present disclosure includes a switching unit that switches whether to supply electric power supplied from an external power source to an electronic component. If it is determined that power can be supplied from the external power supply, the switching unit is controlled to use the power supplied from the external power supply to the electronic component. is configured to work.

According to the above-described embodiments, it is an object to improve convenience by performing switching control of whether to supply or not by controlling the switching unit when operating the electronic component.

FIG. 1 is a side view showing a shovel (excavator) that is an example of a construction machine according to an embodiment. FIG. 2 is a block diagram schematically showing an example of the configuration of the shovel according to the embodiment; FIG. 3 is a diagram illustrating an example of a power supply system related to an air conditioning system and electrical components mounted on the excavator according to the embodiment. FIG. 4 is a diagram showing a flowchart showing processing performed by the battery controller and the excavator controller according to the embodiment. FIG. 5 is a diagram showing a flowchart showing processing performed by the battery controller and the excavator controller according to the modification.

Embodiments will be described below with reference to the drawings.

[Overview of Excavator]
First, an outline of an excavator 200 as an example of an electric excavator will be described with reference to FIG.

An excavator 200 according to the present embodiment includes a lower traveling body 1, an upper rotating body 3 mounted on the lower traveling body 1 so as to be able to turn via a turning mechanism 2, and a boom 4, an arm 5, and a bucket 6 as attachments. and a cabin 10.

The lower traveling body 1 includes, for example, a pair of left and right crawlers, and the respective crawlers are hydraulically driven by traveling hydraulic motors 1A and 1B (see FIG. 2) to self-propell.

The upper revolving structure 3 is hydraulically driven by a revolving hydraulic motor 2M (see FIG. 2) through the revolving mechanism 2 to revolve with respect to the lower traveling structure 1. As shown in FIG. All the driven elements (for example, the swing hydraulic motor 2M) are hydraulically driven by hydraulic fluid 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 the pump electric motor 12 .

Further, the upper rotating body 3 may be electrically driven through the rotating mechanism 2 by a rotating electric motor driven by electric power supplied from the battery module 19 instead of the rotating hydraulic motor 2M. In this case, for example, the excavator 200 is connected from the battery module 19 to the electric motor for turning via the power converter 100 and the inverter. Under the control of the excavator controller 30 and the inverter, the electric motor for turning may perform a power running operation to drive the upper turning body 3 to turn, and a regenerative operation to generate regenerative electric power to brake the turning of the upper turning body 3. . Further, the turning electric motor may supply regenerated electric power to the battery module 19 and the pump electric motor 12 via an inverter.

The boom 4 is attached to the center of the front part of the upper rotating body 3 so as to be able to be raised. An arm 5 is attached to the tip of the boom 4 so as to be vertically rotatable. possible to be installed. The boom 4, arm 5, and bucket 6 are hydraulically driven by boom cylinders 7, arm cylinders 8, and bucket cylinders 9 as hydraulic actuators, respectively.

The bucket 6 is an example of an end attachment, and another end attachment may be attached to the tip of the arm 5 in place of the bucket 6 depending on the type of work and the like. Other end attachments may be different types of buckets than bucket 6, such as slope buckets, dredging buckets, and the like. Other end attachments may also be different types of end attachments than buckets, such as breakers, agitators, grapples, and the like.

The cabin 10 is mounted on the front left side of the upper swing body 3, and is provided with a cockpit in which an operator is seated, an operation device 26 (see FIG. 2) described later, and the like.

The excavator 200 operates driven elements such as a lower traveling body 1 (left and right crawlers), an upper rotating body 3 , a boom 4 , an arm 5 , and a bucket 6 in accordance with operations of an operator riding in the cabin 10 .

Further, the shovel 200 may be configured to be remotely operated (remotely operated) from the outside of the shovel 200 instead of or in addition to being operable by an operator in the cabin 10 . When the excavator 200 is remotely controlled, the interior of the cabin 10 may be unmanned. The following description is based on the premise that the operator's operation includes at least one of the operator's operation of the operating device 26 of the cabin 10 and the external operator's remote operation.

Remote operation includes, for example, a mode in which the excavator 200 is operated by an operation input relating to the actuator of the excavator 200 performed by a predetermined external device. In this case, the excavator 200 is equipped with a communication device 91A (see FIG. 3) capable of communicating with a predetermined external device. You can send. Then, the external device may display the received image information (captured image) on a display device (hereinafter referred to as "remote control display device") provided in the external device. Also, various information images (information screens) displayed on the output device 50 (display device) inside the cabin 10 of the excavator 200 may be similarly displayed on the remote control display device of the external device. As a result, the operator of the external device can remotely operate the excavator 200 while confirming the display contents such as the captured image and the information screen showing the surroundings of the excavator 200 displayed on the remote control display device. can. Then, the excavator 200 operates the hydraulic actuators according to a remote control signal representing the content of the remote control received from an external device by the communication device 91A (see FIG. 3), thereby causing the lower traveling body 1 (left and right crawlers) , upper pivot 3 , boom 4 , arm 5 and bucket 6 .

In addition, the remote operation may include, for example, a mode in which the excavator 200 is operated by a person (for example, a worker) around the excavator 200 externally inputting voice or gesture to the excavator 200 . Specifically, the excavator 200 uses a voice input device (for example, a microphone), a gesture input device (for example, an imaging device), or the like mounted on the excavator 200 (the self machine) to transmit sounds uttered by surrounding workers or the like. or gestures made by a worker or the like. Then, the excavator 200 operates the actuators according to the contents of the recognized voice, gesture, etc., and moves the lower traveling body 1 (left and right crawlers), the upper rotating body 3, the boom 4, the arm 5, the bucket 6, and the like. A drive element may be driven.

In addition, the excavator 200 may automatically operate the actuator regardless of the content of the operator's operation. As a result, the excavator 200 has a function (so-called " "automatic driving function" or "machine control function").

The automatic operation function includes a function to automatically operate driven elements (actuators) other than the driven elements (hydraulic actuators) to be operated (so-called "semi-automatic operation function") ”) may be included. In addition, the automatic operation function includes a function that automatically operates at least a part of a plurality of driven elements (actuators) on the premise that the operator does not operate the operation device 26 or remote control (so-called "fully automatic operation function"). may be included. In the excavator 200, when the fully automatic operation function is enabled, the interior of the cabin 10 may be in an unmanned state. In addition, the semi-automatic operation function, the fully automatic operation function, and the like may include a mode in which the operation contents of the driven elements (actuators) to be automatically operated are automatically determined according to predetermined rules. In addition, in the semi-automatic operation function and the fully automatic operation function, the excavator 200 autonomously makes various judgments, and according to the judgment result, the operation contents of the driven element (actuator) to be autonomously operated automatically. is determined (so-called “autonomous driving function”).

[Excavator configuration]
Next, the configuration of the excavator 200 according to the present embodiment will be described with reference to FIG. 2 in addition to FIG.

FIG. 2 is a block diagram schematically showing an example of the configuration of the shovel 200 according to this embodiment.

In FIG. 2, mechanical power lines are indicated by double lines, hydraulic lines are indicated by thick solid lines, pilot lines are indicated by broken lines, and electric drive/control lines are indicated by thin solid lines.

<Hydraulic drive system>
The hydraulic drive system of the excavator 200 according to the present embodiment includes traveling hydraulic motors 1A and 1B that hydraulically drive driven elements such as the lower traveling body 1, the boom 4, the arm 5, and the bucket 6, a turning hydraulic motor 2M, Hydraulic actuators such as boom cylinder 7 , arm cylinder 8 and bucket cylinder 9 are included. Further, the hydraulic drive system of the excavator 200 according to this embodiment includes the pump electric motor 12 , the main pump 14 , and the control valve 17 .

A pump electric motor 12 (an example of an electric actuator) is a power source for a hydraulic drive system. The pump electric 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 and a power converter 100 via an inverter 18A. The pump motor 12 is powered by three-phase AC power supplied from the battery module 19 via the inverter 18A to drive the main pump 14 and the pilot pump 15 . Drive control of the pump motor 12 may be performed by the inverter 18A under the control of the excavator controller 30, which will be described later.

The main pump 14 sucks hydraulic fluid from the hydraulic fluid tank T and discharges it to the high pressure hydraulic line 16 to supply the hydraulic fluid to the control valve 17 through the high pressure hydraulic line 16 . The main pump 14 is driven by the pump motor 12 . The main pump 14 is, for example, a variable displacement hydraulic pump, and a regulator (not shown) controls the angle (tilt angle) of the swash plate under the control of the excavator controller 30, which will be described later. Thereby, the main pump 14 can adjust the stroke length of the piston and adjust the discharge flow rate (discharge pressure).

The main pump 14 may be driven by power from another power source in addition to the pump motor 12 . For example, when the boom 4 is lowered or the arm 5 is closed, the weight of the boom 4 or arm 5 regenerates the energy of the hydraulic oil discharged from the boom cylinder 7 or arm cylinder 8 to the hydraulic oil tank, and the main pump 14 is operated. You can drive. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 or the arm cylinder 8 to the hydraulic oil tank by the weight of the boom 4 or arm 5 is used to may be driven by a hydraulic motor arranged coaxially with the axis of rotation of the Further, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 or the arm cylinder 8 to the hydraulic oil tank is regenerated by the weight of the boom 4 or the arm 5, and the power is generated by the generator. may be performed. Specifically, when the boom 4 is lowered or the arm 5 is closed, the energy of the hydraulic oil discharged from the boom cylinder 7 or arm cylinder 8 to the hydraulic oil tank by the weight of the boom 4 or arm 5 is used as a generator. A generator may generate electricity by driving a coaxially arranged hydraulic motor. In this case, the power generated by the generator may be supplied to the pump motor 12 or charged in the battery module 19 .

The control valve 17 is a hydraulic control device that controls a hydraulic drive system according to an operator's operation or an operation command corresponding to an automatic operation function. As described above, the control valve 17 is connected to the main pump 14 via the high-pressure hydraulic line 16, and applies hydraulic fluid supplied from the main pump 14 to the hydraulic actuators (traveling hydraulic motors 1A and 1B, turning hydraulic motor 2M, boom It is configured to be selectively supplied to the cylinder 7, the arm cylinder 8, and the bucket cylinder 9). For example, the control valve 17 is a valve unit that includes a plurality of control valves (directional switching valves) that control the flow rate and flow direction of hydraulic oil supplied from the main pump 14 to each hydraulic actuator. Hydraulic fluid supplied from the main pump 14 and passed through the control valve 17 and the hydraulic actuator is discharged from the control valve 17 into the hydraulic fluid tank T.

<Electric drive system>
The electric drive system of the excavator 200 according to this embodiment includes a pump electric motor 12, a sensor 12s, and an inverter 18A. Also, the electric drive system of the excavator 200 according to the present embodiment includes a high-voltage power supply configured by the battery module 19, the power conversion device 100, and the like.

The sensors 12s include a current sensor 12s1, a voltage sensor 12s2, and a rotation state sensor 12s3.

The current sensor 12s1 detects currents of three phases (U-phase, V-phase, and W-phase) of the pump motor 12, respectively. The current sensor 12s1 is provided, for example, in the power path between the pump motor 12 and the inverter 18A. Detection signals corresponding to currents of the three phases of the pump motor 12 detected by the current sensor 12s1 are directly taken into the inverter 18A through the communication line. Also, the detection signal may be taken into the excavator controller 30 through the communication line and input to the inverter 18A via the excavator controller 30 .

The voltage sensor 12s2 detects three-phase voltages applied to the pump motor 12, respectively. The voltage sensor 12s2 is provided, for example, in the power path between the pump motor 12 and the inverter 18A. Detected signals corresponding to the applied voltages of the three phases of the pump motor 12 detected by the voltage sensor 12s2 are directly taken into the inverter 18A through the communication line. Also, the detection signal may be taken into the excavator controller 30 through the communication line and input to the inverter 18A via the excavator controller 30 .

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

The inverter 18A drives and controls the pump electric motor 12 under the control of the excavator controller 30 . The inverter 18A defines, for example, a conversion circuit that converts DC power into three-phase AC power or converts three-phase AC power into DC power, a drive circuit that switches the conversion circuit, and the operation of the drive circuit. and a control circuit for outputting a control signal (for example, a PWM (Pulse Width Modulation) signal).

The control circuit of the inverter 18A performs drive control of the pump electric motor 12 while grasping the operating state of the pump electric motor 12 . For example, the control circuit of the inverter 18A grasps the operation state of the pump electric motor 12 based on the detection signal of the rotation state sensor 12s3. In addition, the control circuit of the inverter 18A sequentially adjusts the rotation angle of the rotating shaft of the pump electric 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 in the control process). By estimating, the operating state of the pump motor 12 may be grasped.

At least one of the drive circuit and the control circuit of the inverter 18A may be provided outside the inverter 18A.

The battery module 19 is configured to supply charged power to electronic components in the excavator 200 . A specific configuration will be described later.

The power conversion device 100 boosts the power of the battery module 19 or steps down the power from the pump motor 12 via the inverter 18A, and causes the battery module 19 to store the power. The power conversion device 100 switches between step-up operation and step-down operation according to the operating state of the pump motor 12 so that the voltage value of the DC (Direct Current) bus 110 falls within a certain range. Switching control between the step-up operation and the step-down operation of the power converter 100 is performed by the excavator controller 30 based on, for example, the voltage detection value of the DC bus 110, the voltage detection value of the battery module 19, and the current detection value of the battery module 19. may be

If there is no need to step up the output voltage of the battery module 19 and apply it to the pump motor 12, the power conversion device 100 may be omitted.

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

The pilot pump 15 supplies pilot pressure to various hydraulic devices (for example, the pressure control valve 31 ) mounted on the excavator 200 via the pilot line 25 . Thereby, the pressure control valve 31 can supply the pilot pressure to the control valve 17 under the control of the excavator controller 30 according to the operation content (for example, the operation amount and the operation direction) of the operating device 26 . Therefore, the excavator controller 30 and the pressure control valve 31 can realize the operation of the driven element (hydraulic actuator) according to the operation content of the operating device 26 by the operator. Under the control of the shovel controller 30 , the pressure control valve 31 can also supply the control valve 17 with a pilot pressure corresponding to the details of the remote operation specified by the remote operation signal. The pilot pump 15 is, for example, a fixed displacement hydraulic pump, and is driven by the pump motor 12 as described above.

The operation device 26 is provided within the reach of the operator in the cockpit of the cabin 10, and the operator can operate the respective driven elements (that is, the left and right crawlers of the lower traveling body 1, the upper rotating body 3, the boom 4, and the arm 5). , and bucket 6, etc.). In other words, the operation device 26 includes hydraulic actuators (for example, traveling hydraulic motors 1A and 1B, turning hydraulic motor 2M, boom cylinder 7, arm cylinder 8, and bucket cylinder 9, etc.) for the operator to drive respective driven elements. and electric actuators. The operation device 26 is, for example, an electric type, and outputs an electric signal (hereinafter referred to as an "operation signal") according to the content of operation by an operator. An operation signal output from the operation device 26 is taken into the excavator controller 30 . As a result, the excavator controller 30 can control the pressure control valve 31 and control the operation of the driven element (actuator) of the excavator 200 in accordance with the operator's operation content, an operation command corresponding to the automatic operation function, and the like. can.

The operating device 26 includes, for example, levers 26A-26C. The lever 26A may be configured, for example, to be able to receive operations related to the arm 5 (arm cylinder 8) and the upper rotating body 3 (rotating motion) according to operations in the front-rear direction and the left-right direction. For example, the lever 26B may be configured to be able to receive operations related to the boom 4 (boom cylinder 7) and the bucket 6 (bucket cylinder 9) in response to operations in the longitudinal direction and the lateral direction. The lever 26C may be configured, for example, to be able to receive the operation of the undercarriage 1 (crawler).

When the control valve 17 is configured by an electromagnetic pilot type control valve (directional switching valve), the operation signal of the electric operation device 26 is directly input to the control valve 17, and each hydraulic control valve is operated by the operation device. 26 may be performed in accordance with the operation content. Further, the operating device 26 may be of a hydraulic pilot type that outputs a pilot pressure corresponding to the content of the operation. In this case, the pilot pressure corresponding to the operation content is supplied to the control valve 17 .

The pressure control valve 31 outputs a predetermined pilot pressure using hydraulic oil supplied from the pilot pump 15 through the pilot line 25 under the control of the excavator controller 30 . A 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 .

<Control system>
The control system of the excavator 200 according to this embodiment includes an excavator controller 30 , an output device 50 and an input device 52 .

Each function of the excavator controller 30 may be realized by arbitrary hardware, or a combination of arbitrary hardware and software. For example, the excavator controller 30 includes a processor such as a CPU (Central Processing Unit), a memory device (main storage device) such as RAM (Random Access Memory), a non-volatile auxiliary storage device such as ROM (Read Only Memory), and a computer including an interface device for input/output with the outside.

The excavator controller 30 controls driving of the excavator 200 . For example, the excavator controller 30 outputs a control command to the pressure control valve 31 according to an operation signal input from the operation device 26, and causes the pressure control valve 31 to output a pilot pressure according to the operation content of the operation device 26. . Thereby, the excavator controller 30 can realize the operation of the driven element (hydraulic actuator) of the excavator 200 corresponding to the operation content of the electric operating device 26 .

Further, when the excavator 200 is remotely operated, the excavator controller 30 may perform control related to remote operation, for example. Specifically, the shovel controller 30 may output a control command to the pressure control valve 31 to cause the pressure control valve 31 to output a pilot pressure according to the details of the remote operation. As a result, the excavator controller 30 can realize the operation of the excavator 200 (driven element) corresponding to the details of the remote operation.

Also, the excavator controller 30 may perform control related to the automatic driving function, for example. Specifically, the excavator controller 30 may output a control command to the pressure control valve 31 and cause the pressure control valve 31 to apply the pilot pressure to the control valve 17 according to the operation command corresponding to the automatic operation function. Thereby, the excavator controller 30 can realize the operation of the driven element (hydraulic actuator) of the excavator 200 corresponding to the automatic driving function.

The excavator controller 30 may integrally control the operation of the entire excavator 200 (various devices mounted on the excavator 200).

The excavator controller 30 may control the air conditioning of the excavator 200 by communicating with the air conditioning controller 81 . In addition, the shovel controller 30 may control the operation and stop of the DC-DC converter 90, for example. In addition, the shovel controller 30 may control the operation and stop of the 24V electrical equipment 91, for example. The air conditioning controller 81, the DC-DC converter 90, and the 24V electrical equipment 91 will be described later.

The excavator controller 30 performs drive control of the electric drive system based on various types of input information (for example, control commands including operation signals of the operation device 26).

Further, the excavator controller 30 drives the power conversion device 100 based on the operating state of the operating device 26, for example, and controls the step-up operation and step-down operation of the power conversion device 100, in other words, the discharge state and charge state of the battery module 19. You may perform switching control with. Further, for example, when the excavator 200 is remotely operated, the excavator controller 30 may drive the power conversion device 100 based on the content of the remote operation, and perform switching control between the discharging state and the charging state of the battery module 19. . Further, for example, when the automatic operation function of the excavator 200 is valid, the excavator controller 30 drives the power conversion device 100 based on an operation command corresponding to the automatic operation function, and changes the discharge state and the charge state of the battery module 19. Switching control may be performed.

The output device 50 is provided in the cabin 10 and outputs various information to the operator under the control of the excavator 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 installed, for example, at a location within the cabin 10 that is easily visible to the operator, and may display various information images under the control of the excavator controller 30 . The display device is, 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 in an audible manner to the operator. The sound output device is, for example, a buzzer, a speaker, or the like.

The input device 52 is provided 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 operator input. Operation input devices include, for example, buttons, toggles, levers, touch panels, touch pads, and the like. The input device 52 may also include, for example, a voice input device that receives voice input from the operator and a gesture input device that receives gesture input from the operator. The voice input device includes, for example, a microphone that picks up the voice of the operator in cabin 10 . Also, the gesture input device includes, for example, an indoor camera capable of imaging the operator's gesture in the cabin 10 . A signal corresponding to an input from the operator received by the input device 52 is captured by the excavator controller 30 .

<Power supply system around the battery module>
FIG. 3 is a diagram showing an example of a power supply system related to an air conditioning system and electrical components mounted on the excavator 200 according to the present embodiment. A high-voltage cable is indicated by a thick solid line, a 24V cable is indicated by a thin solid line, a signal line is indicated by a dotted line, a refrigerant passage is indicated by a one-dot chain line, and a water pipe is indicated by a two-dot chain line.

The excavator 200 includes a normal charging vehicle inlet 101 and a rapid charging vehicle inlet 102 as components for charging the battery module 19 .

Normal charging vehicle inlet 101 is configured to be connectable to a charging connector provided at the tip of a predetermined cable for an external power source (hereinafter referred to as "charging cable").

Charging AC-DC converter 103 converts AC power supplied from an external power source via normal charging vehicle inlet 101 into DC power that can charge battery 192 , and supplies the DC power to battery module 19 .

Rapid charging vehicle inlet 102 is configured to be connectable to a charging connector provided at the tip of a charging cable of an external power supply. The rapid charging vehicle inlet 102 is, for example, an inlet for rapid charging based on CHAdeMO (registered trademark). 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.

The battery module 19 of the excavator 200 according to this embodiment supplies power to each component within the excavator 200 . In the example shown in FIG. 3, the case where the battery module 19 supplies electric power to the air conditioning system 80 and the like will be mainly described.

Battery module 19 includes junction box 193 , battery 192 , and battery controller 191 .

The junction box 193 includes various relays ( an example of a switching unit). For example, the junction box 193 includes a converter relay 193A, a compressor relay 193B, a battery relay 193C, and a heater relay 193D. It should be noted that the object to which the relay is provided is not limited to the DC-DC converter 90, the compressor 82, the battery 192, and the PTC heater 83, and any electronic component to which power is supplied from the battery module 19 may be used.

Converter relay 193 A switches whether to supply power to DC-DC converter 90 under the control of battery controller 191 . One end of the converter relay 193A is connected to the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102,
The battery 192 is switchable. For example, one end of the converter relay 193A is electrically connected to the battery 192 during operation of the excavator 200 . When a charging connector provided in an external power source is connected to normal charging vehicle inlet 101 or quick charging vehicle inlet 102, one end of converter relay 193A is connected to the inlet (normal charging connector) to which the charging connector is connected. It is electrically connected to the charging vehicle inlet 101 or the rapid charging vehicle inlet 102). Further, the other end of converter relay 193A is electrically connected to DC-DC converter 90 . When DC-DC converter 90 is not operating, converter relay 193A is turned off.

The compressor relay 193B switches whether power is supplied to the compressor 82 under the control of the battery controller 191 . One end of the compressor relay 193</b>B enables switching between the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 and the battery 192 . For example, one end of the compressor relay 193B is electrically connected to the battery 192 during operation of the excavator 200 . When a charging connector provided in an external power source is connected to normal charging vehicle inlet 101 or quick charging vehicle inlet 102, one end of compressor relay 193B is connected to the inlet (normal charging connector) to which the charging connector is connected. It is electrically connected to the charging vehicle inlet 101 or the rapid charging vehicle inlet 102). Also, the other end of the compressor relay 193B is electrically connected to the compressor 82 . When the compressor 82 is not operating, the compressor relay 193B is turned off.

The battery relay 193</b>C switches whether to supply power to the battery 192 under the control of the battery controller 191 . One end of the battery relay 193</b>C enables switching between the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 and the battery 192 . For example, one end of the battery relay 193C is electrically connected to the battery 192 during operation of the excavator 200 . When a charging connector provided in an external power supply is connected to normal charging vehicle inlet 101 or quick charging vehicle inlet 102, one end of battery relay 193C is connected to the inlet (normal charging connector) to which the charging connector is connected. It is electrically connected to the charging vehicle inlet 101 or the rapid charging vehicle inlet 102). Also, the other end of the battery relay 193</b>C is electrically connected to the battery 192 . When the battery 192 is not operating, the battery relay 193C is turned off.

The heater relay 193</b>D switches whether power is supplied to the PTC heater 83 under the control of the battery controller 191 . One end of the heater relay 193</b>D enables switching between the normal charging vehicle inlet 101 and the rapid charging vehicle inlet 102 and the battery 192 . For example, one end of the heater relay 193D is electrically connected to the battery 192 during operation of the excavator 200 . When a charging connector provided in an external power source is connected to normal charging vehicle inlet 101 or quick charging vehicle inlet 102, one end of heater relay 193D is connected to the inlet (normal charging connector) to which the charging connector is connected. It is electrically connected to the charging vehicle inlet 101 or the rapid charging vehicle inlet 102). Also, the other end of the heater relay 193</b>D is electrically connected to the PTC heater 83 . When the PTC heater 83 is not operating, the heater relay 193D is turned off.

Battery 192 provides power to various components within excavator 200 . For example, the battery 192 supplies charged (accumulated) power to the pump motor 12 (see FIG. 2). Also, the battery 192 is charged with power generated by the pump motor 12 (regenerative power).

Furthermore, the battery 192 can supply the charged (accumulated) power to at least one of the DC-DC converter 90 , the compressor 82 and the PTC heater 83 .

When the battery 192 is connected to an external power source with a charging cable via the vehicle inlet 101 for normal charging or the vehicle inlet 102 for quick charging, the battery 192 is charged (accumulated) when the battery relay 193C is in the ON state. ) is done.

The battery 192 is charged (accumulated) by being connected to an external power source with a charging cable.

Battery 192 is, for example, a lithium-ion battery and has a relatively high output voltage (eg, hundreds of volts).

A battery controller 191 (an example of a control unit) controls the internal configuration of the battery module 19 . For example, the battery controller 191 monitors the temperature condition of the battery 192 and calculates the SOC (State Of Charge) of the battery 192 . The battery controller 191 then outputs the calculated SOC to the excavator controller 30 . Thereby, the excavator controller 30 can display the SOC of the battery 192 on the output device 50 (display device) inside the cabin 10 .

Battery controller 191 determines whether or not power can be supplied, depending on whether or not the vehicle is connected to an external power supply via a charging cable via normal charging vehicle inlet 101 or quick charging vehicle inlet 102 . In this embodiment, it is determined whether power can be supplied depending on whether a charging cable is connected between the external power source and the excavator 200 . Note that this embodiment does not limit the method of determining whether or not power can be supplied to the determination according to whether or not the charging cable is connected. For example, when performing wireless power supply, another method may be used, such as determining whether or not power supply is possible through mutual communication with a charging facility provided with an external power supply.

When the battery controller 191 determines that the charging cable is connected to the external power source (in other words, when it is determined that power can be supplied), the battery controller 191 connects to the charging facility provided with the external power source. communication between When the battery controller 191 communicates with the charging facility and the charging facility permits power supply, the battery controller 191 starts supplying power from the external power source. Also, the battery controller 191 may adjust the amount of electric power supplied from an external power source through communication with the charging facility.

Then, when the power supply from the charging facility is permitted, the battery controller 191 switches the battery relay 193C to the ON state, thereby starting charging of the battery 192 (supply of power).

The battery controller 191 detects the SOC of the battery 192 and switches the battery relay 193C to the OFF state when determining that the battery 192 is fully charged. Thereby, power consumption can be suppressed.

Furthermore, when the battery controller 191 receives a power supply request from the shovel controller 30 to an electronic component after the power supply from the charging facility is permitted, the battery controller 191 switches the relay corresponding to the electronic component to the ON state, Power from an external power source is supplied to the electronic component to control the operation of the electronic component.

In this embodiment, the junction box 193 is provided with a relay for each electronic component to which power is supplied from an external power supply. Therefore, the battery controller 191 switches ON the relay corresponding to the electronic component whose operation is to be started among the plurality of relays.

Additionally, the battery controller 191 determines the amount of power required for the electronic components to operate. Any method may be used to determine the amount of electric power. For example, the required amount of electric power may be included in the supply request from the excavator controller 30 . Then, the battery controller 191 controls the junction box 193 and the like so that the amount of electric power supplied from the external power supply is distributed to the electronic components. In addition, the battery controller 191 may make a request to further supply the amount of electric power necessary for operating the electronic components through communication with a charging facility provided with an external power supply.

In this embodiment, with the configuration described above, it is possible to switch the relay of the junction box 193 and supply power from the external power source only to the electronic components that operate. Then, the electronic component can start operating with the supplied power.

By the way, conventionally, there has been a desire to supply power to electronic components inside the excavator while power is being supplied from an external power source. In such a case, if the battery in the excavator is charged by an external power source and power is supplied from the battery to the electronic components, the battery will be consumed more. On the other hand, if the electronic components in the shovel are always supplied with power from an external power source, the power supplied to the electronic components may reduce the amount of power supplied to the battery. In this case, it may take time for the battery to reach a fully charged state. Furthermore, when the battery is fully charged and the charging connector provided on the external power supply is connected to the inlet of the excavator, the air conditioner or the like is operated, power is supplied from the battery to the air conditioner or the like, The SOC of the charged battery may drop.

Therefore, in this embodiment, a relay corresponding to each electronic component is provided. Then, when the electronic component needs to be supplied with power from an external power supply, the relay corresponding to the electronic component is switched from the OFF state to the ON state. As a result, it is possible to suppress the supply of electric power to electronic components that the operator does not intend to operate, thereby realizing power saving and shortening the time until the battery 192 is fully charged. Next, an air-conditioning system including electronic parts to which electric power is supplied and electrical components will be described.

<Air conditioning system>
The air conditioning system of the excavator 200 of this embodiment includes an air conditioning system 80 , an air conditioning controller 81 , a compressor 82 , a PTC heater 83 and an electric heater pump 84 .

The air conditioning system 80 is configured to regulate the air and composition conditions inside the cabin 10 . The state of air is, for example, temperature or humidity. The air conditioning system 80 according to the present embodiment is a device unit that integrally includes equipment for adjusting the state of air, such as a blower, a heat exchanger, and a humidifier.

For example, the heat exchanger included in the air conditioning system 80 adjusts the temperature of the surrounding air in the cabin 10 by exchanging heat between the refrigerant flowing from the refrigerant flow path 85B and the surrounding air.

Furthermore, the air-conditioning system 80 performs control to raise the temperature of the components inside the cabin 10 by means of water heated by the PTC heater 83 sent from the water pipe 86C.

Compressor 82 circulates the refrigerant in air conditioning system 80 by sucking the refrigerant from refrigerant flow path 85A and discharging it to refrigerant flow path 85B under the control of air conditioning controller 81 (an example of operation). The compressor 82 is an example of an electronic component that can switch whether to supply power from an external power source.

The PTC (Positive Temperature Coefficient) heater 83 is a type of electric heating wire heater, and performs control to heat water flowing from the water pipe 86B according to control from the air conditioning controller 81 (an example of operation). The water thus heated is sent to the air conditioning system 80 through the water pipe 86C. The PTC heater 83 is an example of an electronic component that can switch whether to supply power from an external power source.

Heater electric pump 84 circulates water in water pipes 86A, 86B, and 86C including air conditioning system 80 by sucking water from water pipe 86A and discharging water to water pipe 86B under the control of air conditioning controller 81. The heater electric pump 84 may operate with electric power supplied from the 24V auxiliary battery 92, for example.

The air-conditioning controller 81 controls the air-conditioning system 80 , the compressor 82 , the PTC heater 83 , and the heater electric pump 84 according to requests from the excavator controller 30 .

For example, power is supplied to the compressor 82 when the compressor relay 193B is switched to the ON state. In such a state, when the air conditioning controller 81 receives an operation request for the compressor 82 and the air conditioning system 80 from the shovel controller 30, it controls the operation of the compressor 82 and the air conditioning system 80 according to the request. Thereby, the temperature or humidity of the air in the cabin 10 can be adjusted.

In the air-conditioning system of this embodiment, the compressor 82 and the PTC heater 83 can be switched by a relay whether or not to supply power from an external power supply. Thereby, the temperature or humidity in the cabin 10 can be adjusted by the control of the excavator controller 30 and the battery controller 191 .

For example, the operator may not be in cabin 10 while battery 192 is charging. Even in such a case, the start of operation of the compressor 82 or the PTC heater 83 can be controlled by transmitting an operation start request from the operator's communication terminal to the shovel controller 30 via the communication device 91A. Therefore, the temperature or humidity of the cabin 10 can be adjusted to a comfortable state by the time the operator returns to the cabin 10 . A specific procedure up to the start of operation will be described later.

Note that the air conditioning system of the present embodiment is an example, and is not limited to the configuration described above. Other electronic components may be included to regulate temperature and humidity. Even if other child parts are provided, the same control as in the present embodiment can be realized by providing relays corresponding to the electronic parts.

<Electrical equipment related>
The excavator 200 of this embodiment includes a DC-DC converter 90 and a 24V auxiliary battery 92 as components for supplying power to a 24V electrical component 91 .

The 24V electrical component 91 is an electrical component provided in the excavator 200 and operates according to the DC power stepped down by the DC-DC converter 90 . The 24V electrical equipment 91 according to this embodiment includes a communication device 91A and an imaging device 91B. Note that the 24V electrical equipment 91 is not limited to the communication device 91A and imaging device 91B, and may include other electronic devices.

The communication device 91A wirelessly communicates with an external communication terminal. The communication device 91A switches whether to enable wireless communication (an example of operation) under the control of the excavator controller 30 .

The imaging device 91</b>B is, for example, a monitoring camera for imaging for the purpose of crime prevention in the cabin 10 , and switches whether or not to perform imaging (an example of operation) under the control of the shovel controller 30 .

The DC-DC converter 90 steps down a very high voltage (for example, about 350 V) of DC power supplied from the battery 192 or an external power supply to about 24 V and outputs the power. The output power of the DC-DC converter 90 is supplied to a 24V auxiliary battery 92 to be charged (accumulated), or supplied to electronic equipment such as each component of the 24V electrical equipment 91 that is driven by 24V power. The DC-DC converter 90 is an example of an electronic component that can switch whether to supply power from an external power source. By supplying electric power from the outside to the DC-DC converter 90, the operation of the 24V electrical component 91 and the charging of the 24V auxiliary battery 92 can be realized.

The 24V auxiliary battery 92 supplies power to the 24V electrical equipment and the excavator controller 30 . Also, when power is supplied from the DC-DC converter 90, the 24V auxiliary battery 92 is charged.

For example, power is supplied to the DC-DC converter 90 when the converter relay 193A is switched to the ON state. In such a state, when the imaging device 91B receives a request to start imaging from the excavator controller 30, it starts imaging in accordance with the request.

As described above, in the present embodiment, the operation of the electronic component is started by receiving the operation request of the electronic component from the excavator controller 30 while the relay corresponding to the electronic component to be operated is in the ON state. be. Since it is necessary to turn on the corresponding relay when operating the electronic component, power consumption can be suppressed.

<Description of processing when power is supplied from an external power supply according to the embodiment>
Next, processing performed by the excavator 200 according to the present embodiment when power is supplied from an external power supply will be described.

FIG. 4 is a diagram showing a flowchart showing the processing performed by the battery controller 191 and the shovel controller 30 according to this embodiment. In the example shown in FIG. 4, the processing flow indicates whether or not heating control by the PTC heater 83 is to be performed during charging. It should be noted that the same processing is performed when controlling the compressor 82 and the like, so the description is omitted.

First, the battery controller 191 determines whether or not the charging cable is connected to the external power source from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 (S401). If it is determined that the external power source is not connected (S401: No), this process is repeated until it is determined that the device is connected.

When the battery controller 191 determines that the charging cable is connected to the external power source from the normal charging vehicle inlet 101 or the rapid charging vehicle inlet 102 (S401: Yes), the battery relay 193C is turned on. Control is performed (S402). Thereby, charging of the battery 192 is started.

On the other hand, after charging is started, the excavator controller 30 determines whether or not a request for operating the PTC heater 83 has been received (S411). The operation request for the PTC heater 83 may be an operator's operation of the operating device 26 of the cabin 10, or may be data received from a communication terminal to which the communication device 91A is connected via a wireless communication line. A communication terminal is a communication device owned by an operator, and may be, for example, a smart phone, a tablet, or a PC.

When the shovel controller 30 determines that the operation request for the PTC heater 83 has not been received (S411: No), the excavator controller 30 repeats the process until it determines that the operation request has been received.

On the other hand, when the shovel controller 30 determines that it has received the operation request for the PTC heater 83 (S411: Yes), it transmits a power supply request to the PTC heater 83 to the battery controller 191 (S412).

After the charging of the battery 192 is started, the battery controller 191 determines whether or not a request for power supply to the electronic component has been received (S403). If it is determined that the request for power supply to the electronic component has not been received (S403: No), the process proceeds to S407.

Further, when the battery controller 191 determines that it has received a power supply request to the electronic component (S403: Yes), it turns on the relay (heater relay 193D) corresponding to the electronic component, for example, the PTC heater 83. is switched (S404). By this switching, power is supplied from the external power source to the electronic component (PTC heater 83).

Then, the battery controller 191 communicates with a charging facility provided with an external power supply so that the amount of power supplied from the external power supply corresponding to the electric component that is the supply request destination is distributed. is controlled (S405).

The battery controller 191 transmits to the excavator controller 30 a notification that power supply to the electronic component (for example, the PTC heater 83) has started (S406).

The battery controller 191 determines whether the battery 192 is fully charged based on the SOC of the battery 192 (S407). If it is determined that the battery 192 is not fully charged (S407: No), the process proceeds to S409.

On the other hand, when the battery controller 191 determines that the battery 192 is fully charged (S407: Yes), it switches the battery relay 193C to the OFF state (S408).

Then, the battery controller 191 determines whether or not the charging cable has been removed from the external power source (S409). If it is determined that it has not been removed (S409: No), the process is repeated from S403.

When the battery controller 191 determines that the charging cable has been removed from the external power source (S409: Yes), the process ends.

On the other hand, after transmitting the power supply request, the excavator controller 30 determines whether or not it has received a notification that power supply to the electronic component has started (S413). If it is determined that the notification has not been received (S413: No), the process is repeated until the notification is received.

When the excavator controller 30 determines that it has received a notification that power supply to the electronic component has started (S413: Yes), the power supply to the PTC heater 83 has started for the air conditioning controller 81. This is notified (S414), and the process ends. Thereby, the air conditioning controller 81 performs control for operating the PTC heater 83 , the heater electric pump 84 , and the air conditioning system 80 . It is assumed that the heater electric pump 84 is supplied with electric power in advance (for example, from the 24V auxiliary battery 92).

According to the processing procedure shown in FIG. 4, regardless of whether or not the battery 192 is being charged while power is being supplied from an external power supply, the electronic component is Power can be supplied to the component from an external power source.

In this embodiment, after the battery 192 is fully charged while being connected to an external power source, if there is no power supply to other electronic components, the shovel controller 30 will restart the internal system. You can bring it down. After shutting down the system, the shovel controller 30 restarts the system when receiving a request to operate the electronic components. Then, the excavator controller 30 determines whether or not power is being supplied from an external power supply, and if it is determined that power is being supplied from the external power supply, the shovel controller 30 operates the electronic components as described above. may be processed.

Further, when an operation request for the 24V electrical component 91 is received, the converter relay 193A may be turned on so that the battery controller 191 supplies power to the DC-DC converter 90, or the converter relay 193A may be turned on. The off state may be maintained and the 24V auxiliary battery 92 may supply power to the 24V electrical component 91 . Then, at the timing when the SOC of the 24V auxiliary battery 92 drops below a predetermined value (for example, a value that requires charging), the converter relay 193A is switched to the ON state to supply power to the DC-DC converter 90. You may do so.

<Description of Screen Display in Embodiment>
In this embodiment, when the electronic components are operated by the power supplied from the external power source, the excavator controller 30 causes the output device 50 (display device) to display the electronic components using the power supplied from the external power source. Information (eg, an icon, etc.) indicating that it is operating may be displayed in a recognizable manner. For example, the excavator controller 30 displays a first icon representing an external power source and a second icon representing an electronic component that operates on power supplied from the external power source, and displays a second icon from the first icon. The icon may be connected with an arrow and displayed by blinking the arrow. Further, the display is not limited to the output device 50 (display device), and may be performed by an external device.

<Description of processing when power is supplied from an external power supply according to Modification 1>
In the processing procedure shown in FIG. 4, an example has been described in which power is supplied from an external power source to electronic components regardless of the state of charge of battery 192 . However, depending on the state of charge of the battery 192, it may be switched whether to supply electric power from an external power supply to the electronic components. Therefore, as a modified example, an example of switching whether or not to supply power to the electronic component according to the state of charge of the battery 192 will be described.

FIG. 5 is a diagram showing a flowchart showing processing performed by the battery controller 191 and the excavator controller 30 according to the modification. In the example shown in FIG. 5, the processing flow indicates whether or not heating control by the PTC heater 83 is to be performed during charging. It should be noted that the same processing is performed when controlling the compressor 82 and the like, so the description is omitted.

The battery controller 191 performs the same processing as S401-S402 in FIG. 4 until the battery relay 193C is turned on (S501-S402).

On the other hand, the shovel controller 30 transmits a power supply request to the PTC heater 83 to the battery controller 191 by performing the same processing as S411-412 in FIG. 4 (S521-S522).

After the charging of the battery 192 is started, the battery controller 191 determines whether or not a request for power supply to the electronic component has been received (S503). If it is determined that the request for power supply to the electronic component has not been received (S503: No), the process proceeds to S509.

When the battery controller 191 determines that it has received a request to supply power to the electronic component (S503: Yes), it determines whether the SOC of the battery 192 is equal to or higher than a predetermined value (S504). For example, the predetermined value may be a value for determining whether or not the battery 192 is in an over-discharged state.

When the battery controller 191 determines that the SOC of the battery 192 is smaller than the predetermined value (S504: No), it notifies the excavator controller 30 that power supply cannot be started (S505), and proceeds to the process of S509.

When the battery controller 191 determines that the SOC of the battery 192 is equal to or higher than the predetermined value (S504: Yes), the electronic component, for example, the relay corresponding to the PTC heater 83 (for example, the heater relay 193D) is switched to the ON state. (S506). By this switching, power is supplied from the external power source to the electronic component (PTC heater 83). Subsequent processing by the battery controller 191 is the same as 405 to 409 in FIG. 4, and description thereof is omitted (S507 to S511).

On the other hand, after transmitting the power supply request, the excavator controller 30 determines whether or not it has received a notification that power supply cannot be started (S523). When the notification to the effect that the operation cannot be started is received (S523: Yes), the operation request destination of the PTC heater 83 is notified to the effect that the operation of the PTC heater 83 cannot be performed (S524), and the process ends. The operation request destination may be, for example, the output device 50 (display device) in the cabin 10 or an external communication terminal connected via the communication device 91A.

Furthermore, the excavator controller 30 determines whether or not it has received a notification that power supply to the electronic component has started (S525). If it is determined that it has not been received (S525: No), the process is repeated from S523.

When the shovel controller 30 determines that it has received the power supply start to the electronic component (S525: Yes), the excavator controller 30 notifies the air conditioning controller 81 of the power supply start to the PTC heater 83. Notify (S526) and terminate the process.

According to the processing procedure shown in FIG. 5, it is possible to switch whether or not to supply power from the external power source to the electronic component according to the SOC of the battery 192 while power is being supplied from the external power source. can. For example, when the battery 192 is in an over-discharged state, the load on the battery 192 can be reduced by giving priority to charging the battery 192 over supplying power to electronic components.

This modification shows a mode of switching whether or not to supply power to an electronic component according to the state of charge of the battery 192 . As an example of the charging status, whether or not the battery is in an over-discharged state is shown, but other modes may be used.

In the example shown in FIG. 5, the case where the predetermined value is the value for determining whether or not the battery is in the over-discharge state has been described. However, the predetermined value is not limited to the value for determining whether or not the battery is in the overdischarge state. Furthermore, the predetermined value may be a different value depending on the situation. For example, the predetermined value may be switched depending on which of vehicle inlet 101 for normal charging and vehicle inlet 102 for quick charging the charging cable is connected. For example, when a charging cable is connected to the rapid charging vehicle inlet 102, the predetermined value (SOC) is set to complete the charging of the battery 192 within one hour even if power is supplied to the electronic components. If it is set to "0" and a charging cable is connected to normal charging vehicle inlet 101, the predetermined value (SOC) may be set to "80" in order to give priority to charging of battery 192. FIG.

In this modification, it is possible to switch whether or not to supply power to the electronic component according to the state of the battery 192, so convenience can be improved.

<Description of processing when power is supplied from an external power supply according to modification 2>
Further, in the modified example described above, an example has been described in which whether or not to supply power to the electronic component is determined according to the SOC of the battery 192 . However, the present invention is not limited to an example in which whether or not to supply power to electronic components is determined according to the SOC of battery 192 . For example, while the battery 192 is charging, power is not supplied from the external power source to the electronic components, and after the charging of the battery 192 is completed, the relay is switched so that power is supplied from the external power source to the electronic components. good too.

That is, when the battery controller 191 receives a request for power supply to the electronic component while it is connected to an external power supply via a charging cable, it determines whether the battery 192 is being charged. When the battery controller 191 determines that the battery is being charged, the relay corresponding to the electronic component is kept off to suppress the supply of power from the external power source to the electronic component. Then, when the battery controller 191 determines that the battery 192 is not being charged (in other words, the charging of the battery 192 is completed), the relay corresponding to the electronic component is switched to the ON state, and the external power source is supplied. , start supplying power to the electronic component.

In this modification, the supply of power from an external power source to the electronic components is suppressed while the battery 192 is being charged, and priority is given to charging the battery 192, so the time until the battery 192 is charged can be shortened. can.

<Description of processing when power is supplied from an external power supply according to Modification 3>
Various aspects are conceivable as criteria for determining whether or not to supply power to an electronic component. For example, if a power supply time period during which the external power source can be connected is set, whether or not power is supplied to the electronic component depending on whether or not charging of the battery 192 is completed within the power supply time period. You can switch between

For example, when the battery controller 191 receives a request for power supply to an electronic component while being connected to an external power supply via a charging cable, based on the SOC of the battery 192 and the remaining power supply time, It is determined whether charging of the battery 192 is completed within the charging time. When the battery controller 191 determines that the charging is not completed, the relay corresponding to the electronic component is kept off to suppress the power supply to the electronic component. Then, when the battery controller 191 determines that the battery 192 is completed, it switches the relay corresponding to the electronic component to the ON state to start supplying power to the electronic component. In this manner, whether to supply power to the electronic component may be switched depending on the time until charging of the battery 192 is completed.

<Description of processing when power is supplied from an external power supply according to Modification 4>
In the above-described embodiment and modification, when the battery controller 191 determines that the battery controller 191 is connected to the external power supply via the charging cable (in other words, when it is determined that power can be supplied), the shovel controller 30 An example has been described in which the relay corresponding to the electronic component is switched to the ON state in response to a power supply request from the electronic component.

In this modification, when the excavator controller 30 is connected to an external power supply via a charging cable, the excavator controller 30 requests the battery controller 191 to supply power to the electronic components according to the state of the excavator 200 or the components of the excavator 200. This is an example of switching whether to perform or not. The constituent elements of the excavator 200 may be electronic components or the like constituting the excavator 200 or circuits within the excavator 200 . The state may be a determination result as to whether or not an abnormality has occurred, or may be the current communication state of the excavator 200 or the like.

For example, the excavator controller 30 performs self-diagnosis when it starts. When the excavator controller 30 recognizes that an abnormality has occurred in the circuit or communication within the excavator 200 as a result of the self-diagnosis, the excavator controller 30 performs Select the power disallow setting. As a result, the shovel controller 30 thereafter prevents the battery controller 191 from requesting power supply to the electronic components even when power can be supplied from an external power source. As a result, the off state of the relay corresponding to the electronic component is maintained, so that the operation of the electronic component can be suppressed.

On the other hand, when the excavator controller 30 recognizes that there is no abnormality in the circuit or communication in the excavator 200 as a result of the self-diagnosis, the excavator controller 30 responds to the flag holding the setting of whether or not to permit power supply in the excavator controller 30. , select the power supply permission setting. After that, the shovel controller 30 requests the battery controller 191 to supply power to the electronic components when it is in a state where power can be supplied from an external power source. As a result, the relay corresponding to the electronic component is turned on.

In this modification, safety can be improved by switching whether to request the battery controller 191 to supply electric power to the electronic components according to the state of the excavator 200 or the components of the excavator 200 .

<Description of Setting Whether to Supply Power to Electronic Components According to Modification 5>
The operator may set whether or not to switch the relay corresponding to the electronic component to the ON state when the device is connected to an external power source with a charging cable.

In this modification, the output device 50 (display device) or a predetermined external device displays a screen for setting whether or not to operate electronic components with power supplied from an external power supply. The operator can perform operation input regarding operation settings via the output device 50 (display device) or a predetermined external device.

As a result, the shovel controller 30 receives operation input regarding operation settings as to whether or not the electronic components are to be operated by the power supplied from the external power supply via the input device 52 . Similarly, the excavator controller 30 may receive information indicating an operation input related to the operation setting from a predetermined external device via the communication device 91A.

When the excavator controller 30 receives operation input for operation settings from the input device 52 or receives information on operation settings from an external device, the shovel controller 30 receives electric power supplied from the external power supply based on the operation settings. to switch whether or not to operate the electronic components.

In other words, in this modification, when an operation input is received from the operator to the effect that the electronic component is to be operated by electric power supplied from an external power source, the excavator controller 30 performs the same procedure as in the above-described embodiment. to power the electronic components. On the other hand, when receiving an operation input from the operator to suppress the operation of the electronic component, the excavator controller 30 supplies power to the electronic component from the external power source even when power can be supplied from the external power source. to prevent In this modified example, it is possible to switch whether or not to supply power according to the operator's request by the control described above, so that convenience can be improved.

The battery controller 191 may calculate the time until charging is completed based on the SOC of the battery 192 and the amount of power from an external power source. Then, the battery controller 191 outputs the calculated time until completion of charging to the excavator controller 30 . As a result, the excavator controller 30 can display the time until charging of the battery 192 is completed on the output device 50 (display device) inside the cabin 10 . In response, the operator can determine whether or not to request operation of the electronic component. The output destination of the calculated time until completion of charging is not limited to the output device 50 (display device), and may be a communication terminal connected via the communication device 91A.

<Description of battery charging method>
In the above-described embodiment and modified example, an example has been described in which the shovel 200 is charged in a wired manner in which a charging cable is connected when power is supplied from an external power source. However, as a charging method for an electric excavator such as the excavator 200 described above, there are a wired method and a wireless method.

In the wired type, the electric excavator can perform normal work even when the power supply cable (corresponding to the charging cable in the above-described embodiment) is connected. Therefore, even if the electric excavator does not have a battery as a main power source, or even if it has only a battery that is smaller than the wireless type, it is always powered and can work. Even when such an electric excavator is operated, control as in the above-described embodiment and modifications may be performed.

In the wireless type, the electric excavator can receive power from an external power source without being connected to the external power source with a charging cable or the like. In this way, power can be supplied without a charging cable, so convenience can be improved. Even with such an electric excavator that can wirelessly supply power, control as in the above-described embodiment and modifications may be performed.

By the way, in the case of wireless power supply, there is a possibility that the energy density of the battery may limit the work continuation time due to changes in the output from the battery or the charging time or charging amount. In the wireless system with such restrictions, further advantages are obtained by performing the control shown in the above-described embodiment and modifications. This is because the wireless system is required to operate under such restrictions, but when the control shown in the above-described embodiment and modification is performed, various functions are exhibited (in other words, electronic parts is operated), appropriate switching control of the relay corresponding to the function is performed, so it is possible to use power efficiently, and it becomes easy to maintain the charge amount of the battery.

<Action>
In the above-described embodiments and modifications, the ON/OFF state of the relay corresponding to the electronic component is switched according to the operation request of the electronic component while power is being supplied from the external power source. As a result, power supply can be suppressed when the operation of the electronic component is not required, and power saving can be achieved.

In addition, in the above-described embodiment and modification, when operating an electronic component, the battery controller 191 can perform switching control as to whether or not to supply power by controlling the relay corresponding to the electronic component. , can improve convenience.

Further, in the above-described embodiments and modifications, the on/off state of the relay corresponding to the electronic component is switched in response to a request from a communication terminal or the like while power is being supplied from an external power source. can be done. That is, it is possible to switch whether or not to supply power to the electronic components without boarding the cabin 10, so that convenience can be improved. As a specific example, while power is being supplied from an external power supply, before the operator gets on board, by making a request to start heating via the communication terminal, the compressor 82 and the PTC heater 83 can be A relay corresponding to the compressor 82 or PTC heater 83 can be turned on so that power is supplied. Thereby, the operator can get on board while the temperature in the cabin 10 is adjusted.

In the present embodiment and modifications, a relay is provided for each electronic component. Thereby, when it is desired to supply power to the electronic component, it is possible to switch the ON/OFF state according to the electronic component. This allows detailed adjustment of power supply.

Although the embodiments and modifications have been described in detail above, the present disclosure is not limited to such specific embodiments and modifications, and various modifications and modifications can be made within the scope of the gist described in the claims. Change is possible.

200 Excavator 1 Undercarriage 2 Revolving Mechanism 3 Upper Revolving Body 4 Boom 5 Arm 6 Bucket 7 Boom Cylinder 8 Arm Cylinder 9 Bucket Cylinder 10 Cabin 30 Excavator Controller 19 Battery Module 191 Battery Controller 192 Battery 193 Junction Box 193A Converter Relay 193B Compressor relay 193C battery relay 193D heater relay 80 air conditioning system 81 air conditioning controller 82 compressor 83 PTC heater 84 electric pump for heater 85A, 85B refrigerant passage 86A, 86B, 86C water tube 90 DC-DC converter 91 24V electric component 91A communication device 91B Imaging device 92 24V auxiliary battery

Claims (9)

Equipped with a switching unit for switching whether to supply power supplied from an external power supply to the electronic component,
When the electric excavator is in a state in which power can be supplied from the external power supply, the switching unit is controlled to operate the electronic component with power supplied from the external power supply.
electric excavator. a control unit configured to determine whether power can be supplied depending on whether a predetermined cable is connected between the external power source and the electric excavator; prepare
The electric excavator according to claim 1. It is configured to determine the amount of power for the electronic component to operate, and distribute the power supplied from the external power supply to the electronic component according to the determined amount of power.
The electric excavator according to claim 1 or 2. The switching unit is provided for each of the plurality of electronic components,
configured to control the switching unit corresponding to the electronic component when operating the electronic component,
The electric excavator according to any one of claims 1 to 3. Equipped with an additional battery,
supplying power from the external power supply to the battery and controlling the switching unit to supply power from the external power supply to the electronic component, or supplying power from the external power supply to the battery controlling the switching unit to suppress the supply of power from the external power supply to the electronic component when performing
The electric excavator according to any one of claims 1 to 4. Equipped with an additional battery,
When power is supplied to the battery from the external power supply, whether power is supplied from the external power supply to the electronic component according to the state of the battery or the time until charging of the battery is completed It is configured to determine whether or not, and control the switching unit according to the result of the determination,
The electric excavator according to any one of claims 1 to 4. When the electric excavator is in a state in which power can be supplied from the external power supply, and when the setting of power supply permission is selected based on the state of the electric excavator or the constituent elements of the electric excavator, the switching unit is configured to operate the electronic component with power supplied from the external power supply,
The electric excavator according to any one of claims 1 to 6. Receiving an operation setting input as to whether or not to operate the electronic component with power supplied from the external power supply;
When the electric excavator is in a state in which power can be supplied from the external power supply, it is configured to switch whether or not to operate the electronic component with power supplied from the external power supply based on the operation setting. has been
The electric excavator according to any one of claims 1 to 7. Information indicating that the electronic component is operating with power supplied from the external power supply when the electronic component is operating with power supplied from the external power supply is recognizable. configured to display in the form of
The electric excavator according to any one of claims 1 to 8.

Images