Electric work machine

Abstract

To provide an electric work machine capable of moving from a work site to a charging site and increasing work efficiency without interrupting one work set.SOLUTION: An electric wheel loader comprises: a battery 27; a travel device 2 and a work device 3 driven by power stored in the battery 27; a controller 37; and an information presentation device 26. The controller 37 calculates a moving power amount required by the wheel loader to move from a work site to a charging site, calculates a work set power amount required by the wheel loader to carry out one work set, and causes the information presentation device 26 to present the stored power amount of the battery 27 together with the moving power amount and the work set power amount.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electric work machine. [Background technology]

[0002] In recent years, from the perspective of reducing carbon dioxide emissions, etc., electric work machines have been proposed that are equipped with a power storage device instead of an engine, and that are configured so that the traveling device and work device are driven by the electricity stored in the power storage device.

[0003] An electric work machine may need to travel back and forth between a charging site where charging equipment for charging the power storage device is located and a work site where the work machine operates. To explain in more detail, even if mobile charging equipment is provided, there may be cases where the charging equipment is not close to the work site. Alternatively, there may be cases where fixed charging equipment is located far from the work site. In such cases, the work machine charges the power storage device at the charging site, then moves to the work site and operates at the work site. Then, when the amount of power stored in the power storage device becomes low, the work machine returns from the work site to the charging site. Therefore, it is necessary to secure the amount of power necessary for the work machine to move from the work site to the charging site.

[0004] Patent Document 1 discloses an electric shovel, which is one type of electric work machine. A controller mounted on this shovel calculates and stores the amount of power consumed while the shovel is moving from a charging site to a work site. The controller then calculates the amount of power that can be consumed at the work site by subtracting the aforementioned amount of power consumption from the amount of power stored in the power storage device. The controller then calculates the amount of time that the shovel can operate at the work site based on the amount of power that can be consumed at the work site and displays this on a display device.

[0005] In the electric shovel of Patent Document 1, if the available operation time displayed on the display device is equal to or greater than zero, it is possible to secure the amount of power required to move from the work site to the charging site. Furthermore, based on the available operation time displayed on the display device, the operator can consider the timing for the shovel to return from the work site to the charging site. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6902159 Summary of the Invention [Problem to be solved by the invention]

[0007] However, while the above-mentioned conventional technology displays the available work time at the work site, it does not display the available work time required for one work set. Therefore, if the available work time displayed on the display device approaches zero, it may be necessary to interrupt one work set. One work set is, for example, a task of repeatedly digging up earth and loading it onto a transport vehicle, thereby filling the transport vehicle's load capacity to a certain extent. If one work set is interrupted, the transport vehicle's load capacity will not be filled, and work efficiency will decrease.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide an electric work machine that can be moved from a work site to a charging site and can improve work efficiency without interrupting a single work set. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides an electric work machine including a power storage device, a traveling device and a work device driven by electricity stored in the power storage device, a controller, and an information display device, wherein the controller calculates a first amount of electricity required for the electric work machine to move from a work site to a charging site, calculates a second amount of electricity required for the electric work machine to perform one set of work, and causes the information display device to display the amount of electricity stored in the power storage device together with the first and second amounts of electricity. [Effects of the Invention]

[0010] According to the present invention, it is possible to move from a work site to a charging site without interrupting one work set, thereby improving work efficiency. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view showing the structure of an electric wheel loader according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram illustrating a configuration of a drive system according to an embodiment of the present invention. [Figure 3] FIG. 2 is a block diagram showing the functional configuration of a controller together with related devices in an embodiment of the present invention. [Figure 4] 4 is a flowchart showing the control content of a controller in one embodiment of the present invention. [Figure 5] 5 is a flowchart showing details of the calculation control of the amount of transferred power shown in FIG. 4. [Figure 6] 5 is a flowchart showing details of the calculation control of the working set power amount shown in FIG. 4. [Figure 7] 1A and 1B are diagrams illustrating a specific example of a display of an information presentation device according to an embodiment of the present invention. [Figure 8] FIG. 10 is a block diagram showing the functional configuration of a controller together with related devices in a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described with reference to the drawings, taking an electric wheel loader as an example of an application of the present invention.

[0013] FIG. 1 is a side view showing the structure of an electric wheel loader according to this embodiment.

[0014] The electric wheel loader of this embodiment comprises an articulated body 1, a traveling device 2 provided on the underside of the body 1 (the underside of Figure 1), and a working device 3 connected to the front side of the body 1 (the right side of Figure 1).

[0015] The vehicle body 1 includes a front vehicle body 1A, a rear vehicle body 1B, a driver's cab 4 provided in the rear vehicle body 1B, a center joint 5 that rotatably connects the front vehicle body 1A and the rear vehicle body 1B to each other, left and right steering cylinders 6 (hydraulic cylinders) provided between the front vehicle body 1A and the rear vehicle body 1B, and an inclination sensor 7 (see Figures 2 and 3 described below) that measures the inclination angle in the traveling direction of the vehicle body 1. The inclination sensor 7 is formed, for example, by an inertial measurement device.

[0016] The left and right steering cylinders 6 constitute a steering device. When the left steering cylinder 6 retracts and the right steering cylinder 6 extends, the front vehicle body 1A rotates to face leftward relative to the rear vehicle body 1B. On the other hand, when the left steering cylinder 6 extends and the right steering cylinder 6 retracts and contracts, the front vehicle body 1A rotates to face rightward relative to the rear vehicle body 1B.

[0017] The traveling device 2 includes left and right front wheels 8A arranged on the front body 1A, left and right rear wheels 8B arranged on the rear body 1B, a transmission 9 and a power transmission mechanism 10 (see FIG. 2 described later) that transmit power from an electric traveling motor (described later) to the front wheels 8A and rear wheels 8B, and a traveling speed sensor 11 (see FIGS. 2 and 3 described later) that measures the traveling speed based on the rotation speed of the front wheels 8A or rear wheels 8B, for example. The power transmission mechanism 10 is composed of a propeller shaft, an axle, a differential gear, etc.

[0018] A braking device is attached to the traveling device 2. The braking device is provided for use when the wheel loader is traveling and includes a plurality of brakes 12 (hydraulic brakes) that brake the front wheels 8A and rear wheels 8B, and a plurality of parking brakes 13 (hydraulic brakes) that are provided for use when the wheel loader is parking and that brake the rear wheels 8B (see FIG. 2 described below).

[0019] The working device 3 includes a pair of arms 14 connected to the front body 1A so as to be rotatable in the vertical direction, a bucket 15 connected to the tip of the pair of arms 14 so as to be rotatable in the vertical direction, a pair of arm cylinders 16 that rotate the pair of arms 14, a bucket cylinder 17 that rotates the bucket 15 via a link mechanism, and a load meter 18 (see Figures 2 and 3 described below) that measures the load amount of the bucket 15.

[0020] The cab 4 is provided with a forward / reverse switching device 19 that commands switching between forward (F), standby (N) and reverse (R) of the wheel loader, a steering operation device 20 that commands the traveling direction of the wheel loader, an accelerator operation device 21 that commands acceleration of the wheel loader, a brake operation device 22 that commands braking when the wheel loader is traveling, a parking brake operation device 23 that commands braking when the wheel loader is parked, an arm operation device 24 that commands rotation of the arm 14, a bucket operation device 25 that commands rotation of the bucket 15, and an information display device 26 that displays information to the driver (see FIG. 2 described below).

[0021] The electric wheel loader of this embodiment is equipped with a battery 27 (power storage device), and is configured so that the traveling device 2, steering device, braking device, and working device 3 described above are driven by the power stored in the battery 27. Details of this drive system will be explained using Figure 2. Figure 2 is a diagram showing the configuration of the drive system in this embodiment.

[0022] The drive system of this embodiment includes a traveling electric motor 29, which is the power source for the traveling device 2 and is driven by power supplied from the battery 27 via a traveling inverter 28, and a work electric motor 31, which is the power source for the steering device, the brake device, and the work device 3 and is driven by power supplied from the battery 27 via a work inverter 30.

[0023] The drive system of this embodiment also includes hydraulic pumps 32A, 32B, 32C and a pilot pump 33 driven by the work electric motor 31, a steering control unit 34 that controls the flow of hydraulic oil from the hydraulic pump 32A to the steering cylinder 6 (more specifically, the direction, flow rate, and pressure), a brake control unit 35 that controls the flow of hydraulic oil from the hydraulic pump 32B to the brake 12 and the parking brake 13 (more specifically, the direction, flow rate, and pressure), and a work control unit 36 ​​that controls the flow of hydraulic oil from the hydraulic pump 32C to the arm cylinder 16 and the bucket cylinder 17 (more specifically, the direction, flow rate, and pressure).

[0024] The drive system of this embodiment also includes a controller 37 that controls the transmission 9, the traveling inverter 28, the working inverter 30, the steering control unit 34, the brake control unit 35, and the work control unit 36. The controller 37 is configured by a microcomputer that includes a CPU (Central Processing Unit) 38 as an operating circuit, a ROM (Read Only Memory) 39 and a RAM (Read Access Memory) 40 as storage devices, an input interface 41, an output interface 42, and other peripheral circuits. The microcomputer may further include a flash memory, a hard disk drive, or the like as storage devices.

[0025] The forward / reverse switching device 19, steering operation device 20, accelerator operation device 21, brake operation device 22, parking brake operation device 23, arm operation device 24, and bucket operation device 25 each have an operation member operated by the driver and a sensor that detects the operation position or operation amount of the operation member and outputs a corresponding operation signal. An input interface 41 of the controller 37 inputs the above-mentioned operation signals.

[0026] The CPU 38 of the controller 37 loads the program stored in the ROM 39 into the RAM 40 and executes control in accordance with the program. That is, the CPU 38 generates a control signal in response to an operation signal input to the input interface 41, and the output interface 42 outputs the control signal generated by the CPU 38.

[0027] More specifically, the controller 37 generates a control signal in response to an operation signal from the forward / reverse switching device 19, and outputs the generated control signal to the transmission 9. The controller 37 generates a control signal in response to an operation signal from the accelerator operation device 21, and outputs the generated control signal to the traveling inverter 28. This causes the traveling device 2 to operate.

[0028] The steering control unit 34 includes a steering control valve that controls the flow of hydraulic oil from the hydraulic pump 32A to the steering cylinder 6, and a steering electromagnetic proportional valve that uses the discharge pressure of the pilot pump 33 as the source pressure and generates a pilot pressure that operates the steering control valve.

[0029] The controller 37 generates a control signal in response to an operation signal from the steering operation device 20, and outputs the generated control signal to the steering electromagnetic proportional valve, thereby operating the steering cylinder 6.

[0030] The brake control unit 35 includes a brake control valve that controls the flow of pressurized oil from the hydraulic pump 32B to the brake 12, a brake electromagnetic proportional valve that uses the discharge pressure of the pilot pump 33 as a source pressure and generates a pilot pressure to operate the brake control valve, a parking brake control valve that controls the flow of pressurized oil from the hydraulic pump 32B to the parking brake 13, and a parking brake electromagnetic proportional valve that uses the discharge pressure of the pilot pump 33 as a source pressure and generates a pilot pressure to operate the parking brake control valve.

[0031] The controller 37 generates a control signal in response to an operation signal from the brake operating device 22 and outputs the generated control signal to the electromagnetic proportional valve for the brake, thereby operating the brake 12. The controller 37 generates a control signal in response to an operation signal from the parking brake operating device 23 and outputs the generated control signal to the electromagnetic proportional valve for the parking brake, thereby operating the parking brake 13.

[0032] The work control unit 36 ​​includes an arm control valve that controls the flow of pressurized oil from the hydraulic pump 32C to the arm cylinder 16, an arm electromagnetic proportional valve that uses the discharge pressure of the pilot pump 33 as a source pressure and generates a pilot pressure that operates the arm control valve, a bucket control valve that controls the flow of pressurized oil from the hydraulic pump 32C to the bucket cylinder 17, and a bucket electromagnetic proportional valve that uses the discharge pressure of the pilot pump 33 as a source pressure and generates a pilot pressure that operates the bucket control valve.

[0033] The controller 37 generates a control signal in response to an operation signal from the arm operating device 24, and outputs the generated control signal to the arm electromagnetic proportional valve, thereby actuating the arm cylinder 16. The controller 37 generates a control signal in response to an operation signal from the bucket operating device 25, and outputs the generated control signal to the bucket electromagnetic proportional valve, thereby actuating the bucket cylinder 17.

[0034] Incidentally, the electric wheel loader described above may need to travel back and forth between a charging site where charging equipment for charging the battery 27 is located and a work site where the wheel loader operates. The controller 37 of this embodiment calculates a first amount of power (hereinafter referred to as "traveling power amount") required for the wheel loader to travel from the work site to the charging site, calculates a second amount of power (hereinafter referred to as "working set power amount") required for the wheel loader to perform one work set (in other words, a work amount or work pattern set from the perspective of work efficiency), and causes the information presentation device 26 to present the amount of power stored in the battery 27 (hereinafter referred to as "storage power amount") together with the traveling power amount and the work set power amount. The functional configuration of the controller 37 related to the above-mentioned control will be explained using FIG. 3. FIG. 3 is a diagram showing the functional configuration of the controller in this embodiment together with related devices.

[0035] The controller 37 has, as its functional configuration, a task recognition unit 44 that recognizes charging tasks, movement tasks, and work sets (in other words, work tasks) based on, for example, the measurement results of the traveling speed sensor 11, the load meter 18, and the battery state measurement device 43; a movement path data creation unit 45 that creates data on the movement path based on, for example, the measurement results of the inclination sensor 7 and the traveling speed sensor 11 during the movement task; a movement power amount calculation unit 46 that calculates the amount of movement power based on the movement path data; a work set power amount calculation unit 47 that calculates the amount of work set power based on, for example, the measurement results of the battery state measurement device 43 during the work set; and an information presentation control unit 48 that causes the information presentation device 26 to present the amount of power stored in the battery 27 together with the amount of movement power and the amount of work set power.

[0036] The battery state measuring device 43 includes, for example, a voltage sensor that measures the voltage of the battery 27 and an auxiliary controller that calculates the amount of charge stored in the battery 27 based on the measurement results of the voltage sensor, and outputs the amount of charge stored in the battery 27 to the controller 37.

[0037] Next, the control contents of the controller 37 will be described with reference to Figs. 4 to 6. Fig. 4 is a flowchart showing the control contents of the controller in this embodiment. Fig. 5 is a flowchart showing the details of the calculation control of the amount of moving power shown in Fig. 4. Fig. 6 is a flowchart showing the details of the calculation control of the amount of working set power shown in Fig. 4.

[0038] In step S10 of FIG. 4, the controller 37 executes calculation control of the traveling electric energy.

[0039] Explaining this in more detail with reference to Fig. 5, first, in step S11, the task recognition unit 44 of the controller 37 determines whether a charging task has started based on whether the traveling speed measured by the traveling speed sensor 11 is less than a predetermined stop threshold (e.g., 5 km / h) and the amount of change in the amount of stored power in the battery 27 calculated based on the measurement results of the battery state measurement device 43 is equal to or greater than a predetermined threshold (e.g., 1% of the maximum amount of stored power). If it is determined that a charging task has started, the task recognition unit 44 of the controller 37 recognizes the current location as a charging site.

[0040] Thereafter, the process proceeds to step S12, where the task recognition unit 44 of the controller 37 determines whether the charging task has been completed based on whether the amount of change in the amount of charge stored in the battery 27 calculated based on the measurement results of the battery state measurement device 43 is less than a predetermined threshold. If it is determined that the charging task has been completed, the process proceeds to step S13.

[0041] In step S13, the task recognition unit 44 of the controller 37 determines whether the movement task has started, for example, based on whether the traveling speed measured by the traveling speed sensor 11 is equal to or greater than a predetermined traveling threshold (e.g., 20 km / h). If it is determined that the movement task has started, the process proceeds to step S14. In step S14, the movement path data creation unit 45 of the controller 37 integrates the traveling speed measured by the traveling speed sensor 11 to calculate the movement distance, and creates movement path data (more specifically, the gradient distribution) by combining the movement distance and the inclination angle measured by the inclination sensor 7.

[0042] Thereafter, the process proceeds to step S15, where the task recognition unit 44 of the controller 37 determines whether the movement task has ended, for example, based on whether the traveling speed measured by the traveling speed sensor 11 is less than the stop threshold. If it is determined that the movement task has not ended, the process proceeds to the above-mentioned step S14, where the movement path data creation unit 45 of the controller 37 continues creating movement path data.

[0043] On the other hand, if it is determined that the movement task has ended, the task recognition unit 44 of the controller 37 recognizes the current location as the workplace. Furthermore, the movement path data creation unit 45 of the controller 37 ends creation of the movement path data. Thereafter, the process proceeds to step S16, where the movement power amount calculation unit 46 of the controller 37 calculates the amount of movement power based on the movement path data (more specifically, using the inverse of the road surface gradient when moving from the charging site to the workplace as the road surface gradient when moving from the workplace to the charging site). This completes step S10 in FIG. 4, and the process proceeds to step S20.

[0044] In step S20 of FIG. 4, the controller 37 executes calculation control of the working set power amount.

[0045] Explaining this in more detail with reference to Figure 6, first, in step S21, the task recognition unit 44 of the controller 37 determines whether a work set has started, for example, by checking whether the load amount of the bucket 15 measured by the load meter 18 exceeds a predetermined threshold. If it is determined that a work set has started, the process proceeds to step S22. In step S22, the work set power amount calculation unit 47 of the controller 37 stores the amount of power stored in the battery 27 at the start of the work set.

[0046] Thereafter, the process proceeds to step S23, where the task recognition unit 44 of the controller 37 determines whether the work set has ended, for example, based on whether the load weight of the bucket 15 measured by the load meter 18 has changed in a predetermined pattern. As a specific example of the predetermined pattern, the task recognition unit 44 determines whether the work set has ended based on whether the maximum value in the change in the load weight of the bucket 15 has accumulated to reach a predetermined target value (for example, a value set in advance or a value input by the driver based on the standard load weight of the transport vehicle), and then whether the load weight of the bucket 15 has decreased to below a predetermined threshold. If it is determined that the work set has ended, the process proceeds to step S24.

[0047] In step S24, working set power amount calculation unit 47 of controller 37 calculates the working set power amount from the amount of change in the amount of charge stored in battery 27 between the start and end of the working set, i.e., the amount of power consumed when the load amount of bucket 15 measured by load meter 18 changes in a predetermined pattern. This completes step S20 in Figure 4, and the process proceeds to step S30.

[0048] 4, the information presentation control unit 48 of the controller 37 causes the information presentation device 26 to present the amount of power stored in the battery 27 measured by the battery state measurement device 43, along with the amount of moving power and the amount of working set power calculated as described above. The information presentation device 26 is, for example, a display device, and displays, on a bar graph showing the amount of power stored in the battery 27, a first level indicating the amount of moving power (however, a minimum limit value of the amount of power stored in the battery 27 to suppress deterioration of the battery 27 may be added), a second level indicating the sum of the amount of moving power and one working set power, and a third level indicating the sum of the amount of moving power and two working set power (see FIG. 7).

[0049] Note that by repeating steps S20 and S30, the display of the amount of stored power in battery 27 and the working set power amount are updated. Furthermore, by repeating step S20, multiple calculated values ​​for the working set power amount are obtained. Therefore, the average value of these values ​​may be calculated and used, or calculated values ​​that deviate from the average value may be excluded. Furthermore, for a working set in which the pattern of change in the load amount of bucket 15 deviates from a predetermined range, the working set power amount may not be calculated, and the working set power amount calculated for the previous working set may be used.

[0050] As described above, in this embodiment, the amount of power stored in the battery 27 is presented to the driver along with the amount of power required for the wheel loader to travel from the work site to the charging site and the amount of work set power required for the wheel loader to perform one work set. This ensures that the amount of power stored in the battery 27 is sufficient for the wheel loader to travel from the work site to the charging site, and the wheel loader can travel from the work site to the charging site. Furthermore, the driver can determine the timing for the wheel loader to return from the work site to the charging site so as not to interrupt one work set. This makes it possible to improve work efficiency.

[0051] In the above embodiment, the controller 37 calculates the working set power amount from the amount of power consumed during one working set, specifically when the load weight of the bucket 15 measured by the load meter 18 changes in a predetermined pattern. However, this is not limited to this. For example, as in the modified example shown in FIG. 8 , the wheel loader may be equipped with attitude sensors 49A, 49B that measure the attitude of the working implement 3 (specifically, the rotation angle of the arm 14 relative to the vehicle body 1 and the rotation angle of the bucket 15 relative to the arm 14). The controller 37 may calculate the working set power amount from the amount of power consumed during one working set, specifically when the attitude of the working implement 3 measured by the attitude sensors 49A, 49B changes in a predetermined pattern (for example, a pattern set by learning the attitude of the working implement 3 over a period set by operating a switch). Alternatively, the controller 37 may calculate the working set power amount from the amount of power consumed during one working set, specifically when the attitude of the working implement 3 and the operation of the traveling unit 2 change in a predetermined pattern.

[0052] Alternatively, the wheel loader may be provided with a switch for inputting the start and end of a work set, and the controller 37 may recognize the start and end of a work set by the input of the switch, and calculate the amount of power consumed during one work set.

[0053] Furthermore, in the above embodiment, an example has been described in which the controller 37 recognizes a movement task by comparing the traveling speed measured by the traveling speed sensor 11 with a predetermined traveling threshold or a predetermined stopping threshold, but this is not limited to this. The controller 37 may recognize a movement task based on whether the wheel loader has continued to move forward for a certain period of time or a certain distance, and may recognize the end of a movement task based on whether the wheel loader has stopped traveling for a certain period of time. Alternatively, the controller 37 may recognize the end of a movement task based on an operation signal from the brake operating device 22 or the parking brake operating device 23.

[0054] Alternatively, the wheel loader may be provided with a switch for inputting the start and end of a movement task, and the controller 37 may recognize the start and end of a movement task by inputting the switch.

[0055] Furthermore, in the above embodiment, an example has been described in which the controller 37 creates travel path data based on the measurement results of the inclination sensor 7 and the travel speed sensor 11, but this is not limiting. The wheel loader may be equipped with a position measurement device that measures the position of the wheel loader based on signals from multiple satellites. The controller 37 may store map data including road surface gradient information, and create travel path data based on the map data and the wheel loader position measured by the position measurement device.

[0056] In the above embodiment, the information display device 26 is a display device that displays the amount of power stored in the battery 27 along with the amount of power for moving and the amount of power set for working, but the information display device 26 is not limited to this. For example, the information display device 26 may be an audio output device that outputs the amount of power stored in the battery 27 as audio along with the amount of power for moving and the amount of power set for working.

[0057] Although not specifically described in the above embodiment, the information display device 26 may include a buzzer. The controller 37 may activate the buzzer to notify the user when the amount of stored power in the battery 27 approaches the amount of power required for movement or when the amount of power required for movement approaches the sum of the amount of power required for movement and the amount of power required for one work set.

[0058] In the above embodiment, the battery state measuring device 43 is described as including an auxiliary controller that calculates the amount of stored power in the battery 27 based on the voltage of the battery 27. However, this is not limiting. That is, the battery state measuring device 43 may not include an auxiliary controller, and the controller 37 may have a function of calculating the amount of stored power in the battery 27 based on the voltage of the battery 27.

[0059] Although the above description has been given taking the example of a wheel loader as the object to which the present invention is applied, the present invention is not limited to this and may be applied to other electric work machines (for example, an electric shovel, etc.). [Explanation of symbols]

[0060] 2 Running gear 3 Work equipment 18 Road meter 26 Information presentation device 27 Battery (energy storage device) 37 Controller 49A, 49B Attitude sensor

Claims

1. An electric work machine including a power storage device, a traveling device and a work device driven by electric power stored in the power storage device, a controller, and an information presentation device, The controller calculating a first amount of electric power required for the electric work machine to travel from a work site to a charging site; calculating a second amount of electric power required for the electric work machine to perform one set of work; An electric working machine, characterized in that the amount of electric power stored in the power storage device is displayed on the information display device together with the first and second amounts of electric power.

2. The electric work machine according to claim 1, a load meter for measuring the load of the working device; the controller calculates, as the second amount of power, an amount of power consumed when the load weight of the work implement measured by the load meter changes in a predetermined pattern.

3. The electric work machine according to claim 1, a posture sensor for detecting the posture of the working device; the controller calculates, as the second amount of power, an amount of power consumed when the attitude of the working device detected by the attitude sensor changes in a predetermined pattern.

4. The electric work machine according to claim 1, the information presentation device displays, on a bar graph showing the amount of power stored in the power storage device, a first level indicating the first amount of power and a second level indicating the sum of the first amount of power and the second amount of power.

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