JP7333551B2 - Image display system for working machines - Google Patents

Description

The present invention relates to an image display system for working machines.

2. Description of the Related Art As described in Patent Literature 1, there is known a technique for remotely controlling a working machine such as a hydraulic excavator.

JP 2004-294067 A

When operating a work machine remotely, an operation using an image of the operator's viewpoint of the work machine lacks a sense of perspective because the displayed image is two-dimensional. Therefore, it becomes difficult to grasp the distance between the work target and the work machine, and work efficiency may decrease. Also, when an operator on a work machine operates the work machine, depending on the skill level of the operator, it may be difficult to grasp the distance between the work machine and the work target, which may reduce work efficiency. .

An object of an aspect of the present invention is to suppress a decrease in work efficiency when performing work using a work machine equipped with a work implement having a work tool.

According to a first aspect, there is provided an image display system for a work machine that is applied to a work machine that includes a work machine having a work tool and a revolving body to which the work machine is attached, and detects the position of the work machine. a position detection unit, a distance detection device that obtains information on the distance from the work machine to the work target, information on the position of the work implement obtained by the position detection unit, and the distance obtained by the distance detection device. a processing device that generates a first image using the information on the position of the work target obtained from the information and causes a display device to display the first image, wherein the first image is the work object facing the work tool. An image display system for a work machine that is generated based on information on a first position corresponding to the work implement on the surface of the object and information on the position of a portion extending from the first position along the direction in which the revolving body revolves. is provided.

According to a second aspect, in the first aspect, the first image has a radius corresponding to the distance between the central axis of rotation of the revolving body and a part of the work implement, and is located at a position corresponding to the central axis of rotation. A work machine image display system is provided that is an image of an arc centered at .

According to a third aspect, in the second aspect, the image of the working machine, wherein the working tool is a bucket, and the part of the working tool is a cutting edge of the bucket located at the center of the bucket in the width direction A display system is provided.

According to a fourth aspect, in any one of the first to third aspects, the processing device generates a line image along the surface of the work target using information on the position of the work target. An image display system for a work machine is provided that generates an image, synthesizes it with the image of the work target, and causes the display device to display the image.

According to a fifth aspect, in the fourth aspect, the line images include a plurality of first line images radially extending from a position corresponding to the turning center axis of the turning body, and and a plurality of second line images extending along the revolving direction of the revolving body.

According to a sixth aspect, in any one of the first to fifth aspects, an imaging device attached to the revolving body is provided, and the processing device comprises the first image and the imaging device. provided is an image display system for a working machine that synthesizes a second image, which is an image of the work target imaged by the above, and causes the display device to display the image.

According to a seventh aspect, in the sixth aspect, the processing device obtains the area occupied by the working machine in the second image using the attitude of the working machine, and uses the obtained area as the work target. A visual display system for a work machine is provided that removes information about the shape of a work machine.

According to an eighth aspect, in the sixth aspect or the seventh aspect, the imaging device, the position detection unit, and the distance detection device are provided in the work machine, and the processing device and the display device are provided in the An image display system for a work machine installed in a facility equipped with an operating device for remotely controlling the work machine is provided.

According to a ninth aspect, the present invention is applied to a working machine including a working machine having a working tool, a revolving body to which the working machine is attached, a position detecting section for detecting the position of the working machine, a distance detecting device, and an imaging device. an image display system for a working machine, comprising: a display device; information on the position of the work implement obtained by the position detection unit; and information on the distance from the working machine to the work target obtained by the distance detection device. A process of generating a first image using the position information of the work target obtained from and synthesizing it with a second image, which is the image of the work target captured by the imaging device, and displaying it on a display device and a device, wherein the first image includes information of a first position corresponding to the work tool on the surface of the work object facing the work tool, and a direction in which the rotating body swings from the first position. A work machine image display system is provided that is generated based on positional information of a portion extending therealong.

According to a tenth aspect, there is provided a remote control system for a work machine including the image display system for the work machine according to the ninth aspect, and an operation device provided on the work machine for operating the work machine.

According to an eleventh aspect, there is provided a working machine including the image display system for a working machine according to any one of the first to ninth aspects.

According to a twelfth aspect, the present invention is applied to a working machine including a working tool, a working machine having the working tool, a revolving body to which the working machine is attached, and an imaging device attached to the revolving body. An image display method of a working machine that is to be operated, wherein the position of the work tool obtained using the attitude of the working machine and the distance information from the working machine to the work target are obtained. positional information, a portion of the work implement is provided with corresponding first position information on the surface of the work object facing the work implement, and along the direction in which the revolving structure revolves from the first position; generating a first image based on information on the position of the portion extending inward; and displaying the generated first image on a display device, wherein the first image faces the work implement. Image display of a work machine generated based on information on a first position corresponding to the work implement on the surface of the work target and information on the position of a portion extending from the first position along the direction in which the revolving body revolves A method is provided.

ADVANTAGE OF THE INVENTION This invention can suppress the fall of the working efficiency at the time of working using the working machine provided with the working machine which has a working tool.

FIG. 1 is a diagram showing an image display system for a work machine and a remote control system for a work machine according to an embodiment. FIG. 2 is a diagram showing a control system of the hydraulic excavator, which is the work machine according to the embodiment. FIG. 3 is a diagram for explaining coordinate systems of the image display system and the remote control system according to the embodiment. FIG. 4 is a rear view of the hydraulic excavator. FIG. 5 is a diagram for explaining the coordinate system of the imaging device and the distance detection device. FIG. 6 is a flowchart of an example of control executed by the image display system and remote control system according to the embodiment. FIG. 7 is a diagram showing an imaging device, a distance detection device, and a work target. FIG. 8 is a diagram for explaining the occupied area. FIG. 9 is a diagram showing information on the shape of the work target from which the occupied area has been removed. FIG. 10 is a diagram showing an example of the first image. FIG. 11 is a diagram for explaining the process of generating the first image by the processing device. FIG. 12 is a diagram for explaining the process of generating the first image by the processing device. FIG. 13 is a diagram showing the positional relationship between the origin of the imaging device and the first image, the first linear image, and the second linear image. 14 is a diagram showing the reference image and the first image shown in FIG. 1. FIG. FIG. 15 is a diagram showing a working image. FIG. 16 is a diagram showing a reference image according to the modification. FIG. 17 is a diagram showing an example of the first image and the third image. FIG. 18 is a diagram showing a control system of a hydraulic excavator according to a modification.

A form (embodiment) for carrying out the present invention will be described in detail with reference to the drawings.

<Overview of image display system for working machine and remote control system for working machine>
FIG. 1 is a diagram showing an image display system 100 for a work machine and a remote control system 101 for a work machine according to an embodiment. An image display system 100 for a working machine (hereinafter appropriately referred to as the image display system 100) is a work object WA and a working tool of the hydraulic excavator 1 when an operator remotely controls the hydraulic excavator 1 as the working machine. The bucket 8 is imaged by the imaging device 19 and the obtained image is displayed on the display device 52 . At this time, the image display system 100 displays a work image 69 including an image 60 for indicating the position of the bucket 8 on the work target WA and an image 68 of the work target WA captured by the imaging device 19. display on the device 52. Image 68 also includes an image of bucket 8 . In an embodiment, working image 69 further includes reference image 65 . The reference image 65 is an image displayed along the surface of the work target WA. The reference image 65 serves as an index representing the position of the work target WA. The work target of the hydraulic excavator 1 is a topographical surface, that is, the work target WA, which is the work target of the work machine 2 provided in the hydraulic excavator 1 .

The image display system 100 includes an imaging device 19 , an orientation detection device 32 , a distance detection device 20 and a processing device 51 . A work machine remote control system 101 (hereinafter referred to as a remote control system 101 as appropriate) includes an imaging device 19 , an attitude detection device 32 , a distance detection device 20 , a work machine control device 27 , and a display device 52 . , a processing device 51 and an operating device 53 . In the embodiment, the imaging device 19 , the attitude detection device 32 and the distance detection device 20 of the image display system 100 are provided in the hydraulic excavator 1 , and the processing device 51 is provided in the facility 50 . The facility 50 is used to remotely control the hydraulic excavator 1 and manage the hydraulic excavator 1 . In the embodiment, the imaging device 19 , the attitude detection device 32 , the distance detection device 20 and the working machine control device 27 of the remote control system 101 are provided in the hydraulic excavator 1 , and the display device 52 , the processing device 51 and the operation device 53 are provided in the facility 50 . be prepared for

The processing device 51 of the image display system 100 includes a processing section 51P, a storage section 51M, and an input/output section 51IO. The processor 51P is exemplified by a processor such as a CPU (Central Processing Unit), for example. The storage unit 51M is exemplified by, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a hard disk drive, a storage device, or a combination thereof. The input/output unit 51IO is an interface circuit for connecting the processing device 51 and an external device. In the embodiment, a display device 52, an operation device 53, and a communication device 54 are connected to the input/output unit 51IO as external devices. External devices connected to the input/output unit 51IO are not limited to these.

The processing device 51 uses the position information of the bucket 8 obtained using the attitude of the working machine 2 and the position information of the work target WA obtained from the distance information obtained by the distance detection device 20, Based on the information on the first position corresponding to the bucket 8 on the work target WA facing the bucket 8 and the information on the position of the portion extending from the first position along the direction in which the upper rotating body 3, which is a rotating body, rotates. The generated first image is generated with the imaging device 19 as a reference. The first position may be a position corresponding to a portion of the bucket 8 on the work target WA facing the bucket 8 . The processing device 51 synthesizes the first image with the image 68 of the work target WA captured by the imaging device 19 and causes the display device 52 to display it. The work target WA is a surface on which the working machine 2 of the hydraulic excavator 1 performs work such as excavation or leveling. The first image is included in the image 60 for indicating the position of the bucket 8 on the work target WA. In the following, the image 68 is appropriately referred to as a second image 68 .

The display device 52 is exemplified by a liquid crystal display or a projector, but is not limited to these. The communication device 54 has an antenna 54A. The communication device 54 communicates with the communication device 25 provided in the excavator 1 to acquire information about the excavator 1 and transmit information to the excavator 1 .

The operating device 53 has a left operating lever 53L arranged on the operator's left side and a right operating lever 53R arranged on the operator's right side. The left operation lever 53L and the right operation lever 53R are operated in the front, rear, left, and right directions to correspond to two-axis operations. For example, the operation of the right operating lever 53R in the front-rear direction corresponds to the operation of the boom 6 of the working machine 2 provided in the hydraulic excavator 1. The operation of the right operating lever 53R in the left-right direction corresponds to the movement of the bucket 8 of the working machine 2. As shown in FIG. The operation of the left operating lever 53L in the front-rear direction corresponds to the movement of the arm 7 of the working machine 2. As shown in FIG. Operation of the left control lever 53L in the left-right direction corresponds to turning of the upper turning body 3 of the hydraulic excavator 1 .

The amount of operation of the left control lever 53L and the right control lever 53R is detected by, for example, a potentiometer and a Hall IC, and the processing device 51 generates control signals for controlling the electromagnetic control valves based on these detected values. . This signal is sent to the work implement control device 27 via the communication device 54 of the facility 50 and the communication device 25 of the hydraulic excavator 1 . The work machine control device 27 controls the work machine 2 by controlling the electromagnetic control valve based on the control signal. The electromagnetic control valve will be described later.

The processing device 51 acquires an input to at least one of the left operating lever 53L and the right operating lever 53R and generates a command for operating at least one of the work implement 2 and the upper revolving body 3 . The processing device 51 transmits the generated command to the communication device 25 of the hydraulic excavator 1 via the communication device 54 . A work machine control device 27 provided in the hydraulic excavator 1 acquires a command from the processing device 51 via the communication device 25 and operates at least one of the work machine 2 and the upper revolving body 3 according to the command.

The hydraulic excavator 1 includes a communication device 25 , a work machine control device 27 , an attitude detection device 32 , an imaging device 19 , a distance detection device 20 , antennas 21 and 22 , and a position calculation device 23 . The work machine control device 27 controls the work machine 2 . The communication device 25 is connected to the antenna 24 and communicates with a communication device 54 provided at the facility 50 . The work machine control device 27 controls the work machine 2 and the upper revolving body 3 . The posture detection device 32 detects the posture of at least one of the work implement 2 and the hydraulic excavator 1 . The imaging device 19 is attached to the hydraulic excavator 1 and images the work target WA. The distance detection device 20 obtains information on the distance from a predetermined position of the hydraulic excavator 1 to the work target WA. Antennas 21 and 22 receive radio waves from positioning satellite 200 . The position calculation device 23 uses the radio waves received by the antennas 21 and 22 to obtain the global positions of the antennas 21 and 22, that is, the positions in the global coordinate system.

<Overall Configuration of Hydraulic Excavator 1>
The hydraulic excavator 1 has a vehicle main body 1B and a working machine 2 as a main body. The vehicle body 1B has an upper revolving body 3 and a traveling device 5 as a traveling body. The upper revolving body 3 has an operator's cab 4 . The travel device 5 has the upper revolving body 3 mounted thereon. The traveling device 5 has a crawler belt. The traveling device 5 causes the hydraulic excavator 1 to travel by rotating the crawler belt. The working machine 2 is attached to the side of the operator's cab 4 of the upper revolving body 3 .

The upper revolving body 3 has a front side on which the working machine 2 and the operator's cab 4 are arranged, and a rear side on which the counterweight 9 is arranged. The left side of the upper revolving body 3 is the left side when viewed forward, and the right side of the upper revolving body 3 is the right side when viewed forward. The hydraulic excavator 1 or the vehicle body 1B has the travel device 5 side with the upper revolving body 3 as a reference, and the upper revolving body 3 side with the travel device 5 as a reference. When the hydraulic excavator 1 is installed on a horizontal plane, the bottom is the vertical direction, that is, the side in which gravity acts, and the top is the side opposite to the vertical direction.

The working machine 2 has a boom 6 , an arm 7 , a bucket 8 as a working tool, a boom cylinder 10 , an arm cylinder 11 and a bucket cylinder 12 . Bucket 8 has a plurality of blades 8B. The cutting edge 8T is the tip of the cutting edge 8B. Bucket 8 is not limited to one having a plurality of blades 8B. Bucket 8 may be a tilt bucket. In addition, instead of the bucket 8, the work machine 2 may include a slope bucket or a rock-drilling attachment having a chip for rock-drilling as a work tool.

The boom cylinder 10, the arm cylinder 11, and the bucket cylinder 12 are hydraulic cylinders driven by the pressure of hydraulic oil discharged from hydraulic pumps. A boom cylinder 10 drives the boom 6 . Arm cylinder 11 drives arm 7 . Bucket cylinder 12 drives bucket 8 .

Antennas 21 , 22 and an antenna 24 are attached to the upper part of the upper revolving body 3 . Antennas 21 and 22 are used to detect the position of hydraulic excavator 1 . Antennas 21 and 22 are electrically connected to a position calculation device 23 .

The antennas 21 and 22 are antennas for GNSS (Kinematic-Global Navigation Satellite Systems, GNSS means global navigation satellite system). The antennas 21 and 22 are arranged apart from each other by a certain distance along the direction parallel to the width direction of the upper swing body 3 . The antennas 21 and 22 receive GNSS radio waves from the positioning satellite 200 and output signals corresponding to the received GNSS radio waves. The antennas 21 and 22 may be GPS (Global Positioning System) antennas. In the following description, the antennas 21, 22 are appropriately referred to as GNSS antennas 21, 22. The position calculation device 23 detects the position of the hydraulic excavator 1 using GNSS, for example.

The imaging device 19 captures an image of the work target WA shown in FIG. 1, and the distance detection device 20 obtains the distance from itself (predetermined position of the hydraulic excavator 1) to the work target WA. It is preferable to obtain information from Therefore, in the embodiment, the antenna 24 , the imaging device 19 and the distance detection device 20 are installed above the driver's cab 4 of the upper swing body 3 . The place where the imaging device 19 and the distance detection device 20 are installed is not limited to above the driver's cab 4 . For example, the imaging device 19 and the distance detection device 20 may be installed inside and above the driver's cab 4 .

The incident surface 19L of the imaging device 19 faces the front of the upper revolving body 3 . The incident surface 20L of the distance detection device 20 faces the front of the upper revolving body 3 . In an embodiment, the imaging device 19 is a monocular camera with an image sensor such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. In embodiments, the distance detection device 20 is a three-dimensional laser range finder or distance sensor. The imaging device 19 and the distance detection device 20 are not limited to these. For example, instead of the imaging device 19 and the distance detection device 20, a device having both a function of acquiring an image of the work target WA and a function of obtaining the distance to the work target WA may be used. An example of such a device is a stereo camera.

<Control system of hydraulic excavator 1>
FIG. 2 is a diagram showing the control system 1S of the hydraulic excavator 1, which is the work machine according to the embodiment. The control system 1S includes a communication device 25, a sensor controller 26, a work machine control device 27, an imaging device 19, a distance detection device 20, a position calculation device 23, an attitude detection device 32, and an IMU (Inertial Measurement Unit). : inertial measurement device) 33 and a hydraulic system 36 . Communication device 25 , sensor controller 26 , and working machine control device 27 are connected by signal line 35 . With such a structure, the communication device 25 , the sensor controller 26 , and the working machine control device 27 can mutually exchange information via the signal line 35 . An in-vehicle signal line such as a CAN (Controller Area Network) is exemplified as a signal line for transmitting information within the control system 1S.

The sensor controller 26 has a processor such as a CPU and storage devices such as RAM and ROM. The sensor controller 26 receives the detection values of the position calculation device 23, the information of the image captured by the imaging device 19, the detection values of the distance detection device 20, the detection values of the orientation detection device 32, and the detection values of the IMU 33. The sensor controller 26 transmits the input detection values and image information to the processing device 51 of the facility 50 shown in FIG. 1 via the signal line 35 and the communication device 25 .

The work machine control device 27 has a processor such as a CPU and storage devices such as RAM and ROM. The work machine control device 27 acquires a command for operating at least one of the work machine 2 and the upper swing body 3 generated by the processing device 51 of the facility 50 via the communication device 25 . The work implement control device 27 controls the electromagnetic control valve 28 of the hydraulic system 36 based on the acquired command.

The hydraulic system 36 includes an electromagnetic control valve 28, a hydraulic pump 29, and hydraulic actuators such as the boom cylinder 10, the arm cylinder 11, the bucket cylinder 12 and the swing motor 30. The hydraulic pump 29 is driven by the engine 31 and discharges hydraulic oil for operating the hydraulic actuators. The work machine control device 27 controls the flow rate of hydraulic oil supplied to the boom cylinder 10 , the arm cylinder 11 , the bucket cylinder 12 and the swing motor 30 by controlling the electromagnetic control valve 28 . In this manner, the work implement control device 27 controls the operations of the boom cylinder 10 , the arm cylinder 11 , the bucket cylinder 12 and the swing motor 30 .

The sensor controller 26 acquires detection values of the first stroke sensor 16 , the second stroke sensor 17 and the third stroke sensor 18 . The first stroke sensor 16 is provided on the boom cylinder 10, the second stroke sensor 17 is provided on the arm cylinder 11, and the third stroke sensor 18 is provided on the bucket cylinder 12, respectively.

The first stroke sensor 16 detects the boom cylinder length, which is the length of the boom cylinder 10 , and outputs it to the sensor controller 26 . The second stroke sensor 17 detects the arm cylinder length, which is the length of the arm cylinder 11 , and outputs it to the sensor controller 26 . The third stroke sensor 18 detects the bucket cylinder length, which is the length of the bucket cylinder 12 , and outputs it to the sensor controller 26 .

Once the boom cylinder length, the arm cylinder length, and the bucket cylinder length are determined, the attitude of the work implement 2 is determined. Therefore, the first stroke sensor 16 , the second stroke sensor 17 and the third stroke sensor 18 that detect these correspond to the attitude detection device 32 that detects the attitude of the working machine 2 . The posture detection device 32 is not limited to the first stroke sensor 16, the second stroke sensor 17 and the third stroke sensor 18, and may be an angle detector.

Based on the boom cylinder length detected by the first stroke sensor 16 , the sensor controller 26 calculates the tilt angle of the boom 6 with respect to the direction orthogonal to the horizontal plane in the vehicle body coordinate system, which is the coordinate system of the hydraulic excavator 1 . The sensor controller 26 calculates the tilt angle of the arm 7 with respect to the boom 6 from the arm cylinder length detected by the second stroke sensor 17 . The sensor controller 26 calculates the tilt angle of the bucket 8 with respect to the arm 7 from the bucket cylinder length detected by the third stroke sensor 18 . The tilt angles of the boom 6 , the arm 7 and the bucket 8 are information indicating the posture of the work implement 2 . That is, the sensor controller 26 obtains information indicating the attitude of the work implement 2 . The sensor controller 26 transmits the calculated tilt angle to the processing device 51 of the facility 50 shown in FIG. 1 via the signal line 35 and the communication device 25 .

The position calculation device 23 has a processor such as a CPU and storage devices such as RAM and ROM. The position calculation device 23 obtains the position of the hydraulic excavator 1 . Specifically, the position calculation device 23 uses signals acquired from the antennas 21 and 22 to detect and output the positions of the antennas 21 and 22 and the azimuth of the upper rotating body 3 in the global coordinate system. The orientation of the upper revolving structure 3 represents the orientation of the upper revolving structure 3 in the global coordinate system. The orientation of the upper revolving structure 3 can be represented, for example, by the longitudinal direction of the upper revolving structure 3 around the vertical axis of the global coordinate system. The azimuth angle is the rotation angle of the reference axis in the front-rear direction of the upper revolving body 3 around the vertical axis of the global coordinate system. The azimuth angle represents the azimuth of the upper revolving body 3 .

The IMU 33 detects the motion and posture of the hydraulic excavator 1 . The operation of the hydraulic excavator 1 includes at least one of the operation of the upper revolving body 3 and the operation of the travel device 5 . The posture of the hydraulic excavator 1 is represented by the roll angle, pitch angle, and yaw angle of the hydraulic excavator 1 . In the embodiment, the IMU 33 detects and outputs the angle or angular velocity and acceleration of the excavator 1 . The angles of the hydraulic excavator 1 detected by the IMU 33 are the roll angle, pitch angle and yaw angle of the hydraulic excavator 1 .

<About the coordinate system>
FIG. 3 is a diagram for explaining coordinate systems of the image display system 100 and the remote control system 101 according to the embodiment. FIG. 4 is a rear view of the hydraulic excavator 1. FIG. FIG. 5 is a diagram for explaining the coordinate system of the imaging device 19 and the distance detection device 20. As shown in FIG.

In the image display system 100 and the remote control system 101, a global coordinate system, a vehicle body coordinate system, a coordinate system of the imaging device 19, and a coordinate system of the distance detection device 20 exist. The global coordinate system (Xg, Yg, Zg) is a three-dimensional coordinate system based on the origin PG fixed on the earth. In embodiments, the global coordinate system is, for example, the coordinate system in GNSS or GPS.

The vehicle body coordinate system is a three-dimensional coordinate system represented by (Xm, Ym, Zm) with the excavator 1 as a reference. In the embodiment, the origin position PL of the vehicle body coordinate system is the intersection of the Zm axis, which is the central axis of rotation of the upper revolving structure 3, and the plane perpendicular to the Zm axis within the swing circle of the upper revolving structure 3. It is not limited. The Xm-axis extends in the front-rear direction of the upper revolving body 3 and is perpendicular to the Zm-axis. The Xm axis is a reference axis in the front-rear direction of the upper rotating body 3 . The Ym-axis is an axis extending in the width direction of the upper revolving body 3 that is perpendicular to the Zm-axis and the Xm-axis. The plane perpendicular to the Zm-axis in the swing circle can be a plane passing through the center of the swing circle in the Zm-axis direction.

In the embodiment, as shown in FIG. 5, the coordinate system of the imaging device 19 (hereinafter referred to as the imaging device coordinate system) has an origin PC (Xc , Yc, Zc). The Xc axis of the imaging device coordinate system (Xc, Yc, Zc) is an axis passing through the optical center of the imaging device 19 and extending in a direction perpendicular to the imaging surface 19P. The Yc-axis is an axis perpendicular to the Xc-axis. The Zc-axis is an axis orthogonal to both the Xc-axis and the Yc-axis.

In the embodiment, the coordinate system of the distance detection device 20 is three-dimensional coordinates indicated by (Xd, Yd, Zd) with the center of the detection surface 20P of the distance detection element 20RC as the origin PD, as shown in FIG. It is a system.

<Posture of hydraulic excavator 1>
As shown in FIG. 4, the inclination angle θ4 of the upper revolving structure 3 with respect to the lateral direction, that is, the width direction is the roll angle of the excavator 1, and the inclination angle θ5 of the upper revolving structure 3 with respect to the longitudinal direction is the pitch of the hydraulic excavator 1. The angle of the upper revolving body 3 about the vertical axis is the yaw angle of the hydraulic excavator 1 . The roll angle, pitch angle and yaw angle are obtained by integrating the angular velocities detected by the IMU 33 over time.

The acceleration and angular velocity detected by the IMU 33 are output to the sensor controller 26 as motion information. The sensor controller 26 performs processing such as filtering and integration on the motion information acquired from the IMU 33 to obtain a tilt angle θ4 that is a roll angle, a tilt angle θ5 that is a pitch angle, and a yaw angle. The sensor controller 26 transmits the calculated inclination angle θ4, inclination angle θ5, and yaw angle as information related to the posture of the hydraulic excavator 1, as shown in FIG. It is transmitted to the processing device 51 of the facility 50 where the data is sent.

The sensor controller 26 obtains information indicating the attitude of the work implement 2 as described above. Specifically, the information indicating the posture of the work implement 2 is the inclination angle θ1 of the boom 6 with respect to the direction (Zm-axis direction) orthogonal to the horizontal plane in the vehicle body coordinate system, the inclination angle θ2 of the arm 7 with respect to the boom 6, and the angle θ2 with respect to the arm 7. It is the inclination angle θ3 of the bucket 8 . The processing device 51 of the facility 50 shown in FIG. , P4, which is appropriately referred to as the cutting edge position, is calculated.

The storage unit 51M of the processing device 51 stores data of the working machine 2 (hereinafter referred to as working machine data as appropriate). The work machine data includes the length L1 of the boom 6, the length L2 of the arm 7, and the length L3 of the bucket 8. As shown in FIG. 3 , the length L1 of boom 6 corresponds to the length from boom pin 13 to arm pin 14 . The length L2 of arm 7 corresponds to the length from arm pin 14 to bucket pin 15 . The length L3 of the bucket 8 corresponds to the length from the bucket pin 15 to the cutting edge 8T of the bucket 8. As shown in FIG. The cutting edge 8T is the tip of the cutting edge 8B shown in FIG. The work machine data includes information on the position up to the boom pin 13 with respect to the origin position PL of the vehicle body coordinate system. Using the lengths L1, L2, L3, the inclination angles θ1, θ2, θ3, and the origin position PL, the processing device 51 can obtain the cutting edge position P4 with respect to the origin position PL. In the embodiment, the processing device 51 of the facility 50 obtains the cutting edge position P4, but the sensor controller 26 of the hydraulic excavator 1 may obtain the cutting edge position P4 and transmit it to the processing device 51 of the facility 50. FIG. The cutting edge position P<b>4 is the position of the cutting edge 8</b>T of the bucket 8 that is a part of the working machine 2 , so it is the position of the working machine 2 . In the former case, the posture detection device 32, the sensor controller 26, and the processing device 51 correspond to a position detection section that detects the position of the working machine. In the latter case, the attitude detection device 32 and the sensor controller 26 correspond to a position detection section that detects the position of the working machine.

The position detection unit is not limited to the orientation detection device 32, the sensor controller 26 and the processing device 51, or the orientation detection device 32 and the sensor controller 26 described above. For example, the position of the working machine may be detected by a distance measuring device such as a stereo camera or a laser scanner. In this case, the distance measuring device corresponds to the position detection section that detects the position of the working machine.

<Example of Control Executed by Image Display System 100 and Remote Control System 101>
FIG. 6 is a flowchart of an example of control executed by the image display system 100 and the remote control system 101 according to the embodiment. FIG. 7 is a diagram showing the imaging device 19, the distance detection device 20, and the work target WA.

In step S<b>101 , the sensor controller 26 shown in FIG. 2 acquires information on the excavator 1 . The information of the hydraulic excavator 1 is information obtained from the imaging device 19 , the distance detection device 20 , the position calculation device 23 , the attitude detection device 32 and the IMU 33 . As shown in FIG. 7, the imaging device 19 images the work target WA within the imaging range TA to obtain an image of the work target WA. The distance detection device 20 detects the distance Ld from the distance detection device 20 to the work target WA and other objects present within the detection range MA. The position calculation device 23 obtains reference position information Pga1 and Pga2 corresponding to the positions P1 and P2 of the GNSS antennas 21 and 22 in the global coordinate system. The posture detection device 32 detects the boom cylinder length, the arm cylinder length, and the bucket cylinder length. The IMU 33 detects the attitude of the hydraulic excavator 1 , more specifically, the roll angle θ4, the pitch angle θ5 and the yaw angle of the upper swing body 3 .

In step S<b>102 , the image display system 100 and the processing device 51 of the remote control system 101 receive the hydraulic pressure from the sensor controller 26 of the hydraulic excavator 1 via the communication device 25 of the hydraulic excavator 1 and the communication device 54 connected to the processing device 51 . Get the information of Excavator 1.

The information of the hydraulic excavator 1 acquired by the processing device 51 from the sensor controller 26 includes the image of the work target WA captured by the imaging device 19 and the distance from the distance detection device 20 to the work target WA detected by the distance detection device 20. Information on the distance, information on the attitude of the work implement 2 included in the hydraulic excavator 1 detected by the attitude detection device 32, reference position information Pga1 and Pga2, and information on the attitude of the hydraulic excavator 1 are included.

The information on the distance from the distance detection device 20 to the work target WA includes the distance Ld to the work target WA or the object OB existing within the detection range MA, and the azimuth information of the position Pd corresponding to the distance Ld. In the example shown in FIG. 7, the distance Ld is shown as the distance to the work target WA. The azimuth information of the position Pd is the azimuth of the position Pd with respect to the distance detection device 20 and the angles with respect to the axes Xd, Yd, and Zd of the coordinate system of the distance detection device 20 . The information on the posture of the work implement 2 acquired by the processing device 51 is the inclination angles θ1, θ2, and θ3 of the work implement 2 obtained by the sensor controller 26 using the boom cylinder length, the arm cylinder length, and the bucket cylinder length. The posture information of the hydraulic excavator 1 is the hydraulic excavator 1, more specifically, the roll angle θ4, the pitch angle θ5, and the yaw angle of the upper revolving body 3. FIG.

The processing device 51 acquires the tilt angles θ1, θ2, and θ3 of the working machine 2 obtained from the sensor controller 26, the length L1 of the boom 6, the length L2 of the arm 7, and the length of the bucket 8 stored in the storage unit 51M. The cutting edge position P4 of the bucket 8 is obtained using the height L3. The cutting edge position P4 of the bucket 8 is a set of coordinates in the vehicle body coordinate system (Xm, Ym, Zm) of the excavator 1 .

In step S103, the processing device 51 converts the distance Ld to the work target WA into position information using the distance information to the work target WA. The positional information is the coordinates of the position Pd in the coordinate system (Xd, Yd, Zd) of the distance detection device 20 . In step S103, all the distances Ld detected by the distance detection device 20 within the detection range MA are converted into position information. The processing device 51 converts the distance Ld into positional information using the distance Ld and the azimuth information of the position Pd corresponding to the distance Ld. In step S103, the distance to the object OB existing within the detection range MA is also converted into position information in the same manner as the distance Ld of the work target WA. Information on the position of the work target WA within the detection range MA is obtained by the processing of step S103. Information on the shape of the work target WA can be obtained from information on the position of the work target WA.

The position information and shape information of the work target WA are a set of coordinates of the position Pd in the coordinate system (Xd, Yd, Zd) of the distance detection device 20 . The processing device 51 converts the shape information of the work target WA into values in the imaging device coordinate system (Xc, Yc, Zc), and then into values in the vehicle body coordinate system (Xm, Ym, Zm). Next, in step S104, the processing device 51 obtains the occupied area SA.

FIG. 8 is a diagram for explaining the occupied area SA. The occupied area SA is an area occupied by the work implement 2 within the information on the shape of the work target WA. In the example shown in FIG. 8, the bucket 8 of the working machine 2 is within the detection range MA of the distance detection device 20 and between the distance detection device 20 and the work target WA. Therefore, in the occupied area SA, the distance detection device 20 detects the distance to the bucket 8 instead of the distance to the work target WA. In step S105, the processing device 51 removes the occupied area SA from the shape information of the work target WA obtained in step S103.

In removing the portion of the occupied area SA, the processing device 51 stores information on at least one of the position and orientation detected by the distance detection device 20 according to at least one of the position and orientation of the bucket 8, for example, in the storage unit 51M. let me Such information is included in the attitude of the work implement 2 of the hydraulic excavator 1 in this embodiment. The posture of the work implement 2 is determined using the inclination angles θ1, θ2, and θ3 of the work implement 2, the length L1 of the boom 6, the length L2 of the arm 7, and the length L3 of the bucket 8. It can be obtained using posture. Then, the processing device 51 compares the information detected by the distance detection device 20 and the information stored in the storage unit 51M, and if the two match, it can be assumed that the bucket 8 has been detected. Since the portion where both are matched corresponds to the occupied area SA, the processing device 51 removes the portion of the occupied area SA from the shape information of the work target WA.

By the process of removing the occupied area SA using the attitude of the work machine 2, the processing device 51 can remove the occupied area SA when generating the reference image 65, which is an index representing the position of the work target WA shown in FIG. Since the information of the bucket 8 of 1 is not used, the reference image 65 can be generated accurately.

The process of removing the portion of the occupied area SA using the attitude of the work implement 2 may be performed by the following method. Information about at least one of the position and attitude of the bucket 8 in the vehicle body coordinate system included in the attitude of the work implement 2 includes the tilt angles θ1, θ2, and θ3 of the work implement 2, the length L1 of the boom 6, the length of the arm 7, and the It is obtained from L2 and the length L3 of the bucket 8. In step S103, information on the shape of the work target WA in the vehicle body coordinate system is obtained. In step S105, the processing device 51 removes the area obtained by projecting the position of the bucket 8 onto the shape information of the work target WA as the occupied area SA from the shape of the work target WA.

FIG. 9 is a diagram showing information on the shape of the work target WA from which the occupied area has been removed. The shape information IMWA of the work target WA is a set of coordinates Pmd (Xmd, Ymd, Zmd) in the vehicle body coordinate system (Xm, Ym, Zm). The occupied area SA does not have coordinate information due to the processing in step S105. Next, proceeding to step S106, the processing device 51 generates a first image. The first image is an image including a portion corresponding to the bucket 8 or a portion corresponding to a part of the bucket 8 on the work target WA and extending along the direction in which the upper rotating body 3 of the hydraulic excavator 1 rotates. .

<1st image>
FIG. 10 is a diagram showing an example of the first image IMC. 11 and 12 are diagrams for explaining the process of generating the first image IMC by the processing device 51. FIG. In the embodiment, the first image IMC shown in FIG. 10 shows the position of the cutting edge 8T of the bucket 8 on the work target WA, and the upper revolving body 3 revolves while the work implement 2 maintains its current attitude. 4 shows the position of the cutting edge 8T on the surface of the work target WA in this case. Next, processing for generating the first image IMC by the processing device 51 will be described.

As shown in FIGS. 10 and 12, the first image IMC has a radius equal to the distance Rbt between the Zm-axis and the bucket 8 when viewed from the Zm-axis of the vehicle body coordinate system, which is the turning center axis of the upper turning body 3. It is also an image of an arc centered at a position corresponding to the Zm axis. In the embodiment, the position of the bucket 8 used when obtaining the distance Rbt is the position of the cutting edge 8T of the bucket 8 that is present in the center of the bucket 8 in the width direction Wb, as shown in FIG. The position of the bucket 8 used when obtaining the distance Rbt is not limited to the cutting edge 8T at the center of the bucket 8 in the width direction Wb. The distance Rbt is between the Zm axis of the vehicle body coordinate system along the direction parallel to the Xm-Ym plane of the vehicle body coordinate system and the position Pbt (Xmbt, Ymbt, Zmbt) of the cutting edge 8T at the center of the width direction Wb of the bucket 8. is the distance of A position Pbt (Xmbt, Ymbt, Zmbt) is a position in the vehicle body coordinate system.

A line LC in FIG. 12 indicates the center of the bucket 8 in the width direction Wb. The width direction Wb of the bucket 8 is parallel to the direction in which the bucket pin 15 connecting the bucket 8 and the arm 7 extends, and is parallel to the Ym axis of the vehicle body coordinate system. The distance Rbt is the distance between the Zm-axis and the tooth edge 8T of the bucket 8 along the direction parallel to the Xm-axis in the vehicle body coordinate system.

The position indicated by the first image IMC is the position of the surface WAS of the work target WA. The processing device 51 projects a circular arc having a radius of a distance Rbt centered on the Zm axis of the vehicle body coordinate system onto the surface WAS of the axial work target WA in a direction parallel to the Zm axis of the vehicle body coordinate system (hereinafter referred to as The position Pt (Xmt, Ymt, Zmt) of the crossing portion is obtained. The image of the intersecting portion becomes the first image IMC.

The position of intersection Pt (Xmt, Ymt, Zmt) is, for example, the position of the intersection of a curved surface having a radius of distance Rbt centered on the Zm axis of the vehicle body coordinate system and the surface WAS of the work target WA. . A portion where a straight line VL extending in a direction parallel to the Zm axis of the vehicle body coordinate system and passing through the cutting edge 8T of the bucket 8 located in the center of the width direction Wb of the bucket 8 intersects the surface WAS of the work target WA is the crossing portion. Some positions. The processing device 51 generates the first image IMC using the information on the intersection position Pt (Xmt, Ymt, Zmt). The first image IMC corresponds to information on the intersection position Pt (Xmt, Ymt, Zmt).

A first position Ptc in the intersection position Pt (Xmt, Ymt, Zmt) is the position of the bucket 8 on the surface WAS of the work target WA facing the bucket 8, in the embodiment, the center of the bucket 8 in the width direction Wb. corresponds to the position of the cutting edge 8T of the bucket 8 existing at . The first position Ptc is not limited to the position of the cutting edge 8T at the center in the width direction Wb, and may be at one end in the width direction Wp, for example.

The position of the portion extending from the first position Ptc along the turning direction Rtd of the upper turning body 3 is the portion of the intersection position Pt (Xmt, Ymt, Zmt) extending from the first position Ptc along the turning direction Rtd. is the position of The first image IMC corresponds to information on the first position Ptc and information on the position of a portion extending from the first position Ptc along the turning direction Rtd. That is, the first image IMC is generated based on information on the first position Ptc and information on the position of the portion extending from the first position Ptc along the turning direction Rtd.

In the embodiment, the processing device 51 also causes the display device 52 shown in FIG. 1 to display the first straight line image 62, which is the image of the straight line LV1, and the second straight line image 63, which is the image of the straight line LV2. The straight line LV1 is a straight line extending from the outer position Pb1 of the blade 8B on one end 8Wt1 side in the width direction Wb of the bucket 8 to the surface WAS of the work target WA along the direction parallel to the Zm axis of the vehicle body coordinate system. is. A straight line LV2 is a straight line extending from a position Pb2 outside the blade 8B on the side of the other end 8Wt2 in the width direction Wb of the bucket 8 to the surface WAS of the work target WA along a direction parallel to the Zm axis of the vehicle body coordinate system. is. Let Pt1 be the position of the intersection of the straight line LV1 and the surface WAS of the work target WA, and Pt2 be the position of the intersection of the straight line LV2 and the surface WAS of the work target WA. Since the position of each part of the bucket 8 in the vehicle body coordinate system and the position of the surface WAS of the work target WA in the vehicle body coordinate system are known, the processing device 51 can obtain the positions Pb1, Pb2, Pt1 and Pt2 from these positions. can. If the positions Pb1, Pb2, Pt1, and Pt2 are obtained, the straight line LV1 and the straight line LV2 are also obtained, so the processing device 51 can generate the first straight line image 62 and the second straight line image 63. FIG.

Once the first image IMC, the first linear image 62 and the second linear image 63 are obtained, the processing device 51 converts them into images of the viewpoint of the imaging device 19 . The image of the viewpoint of the imaging device 19 is an image with the imaging device 19 as a reference. Next, processing for converting the first image IMC, the first straight line image 62 and the second straight line image 63 into images of the viewpoint of the imaging device 19 will be described.

FIG. 13 is a diagram showing the positional relationship between the origin PC of the imaging device 19 and the first image IMC, the first straight line image 62 and the second straight line image 63. As shown in FIG. The viewpoint image of the imaging device 19 is an image when the first image IMC, the first linear image 62, and the second linear image 63 are viewed from the origin PC of the imaging device in the vehicle body coordinate system (Xm, Ym, Zm). .

The first image IMC, the first linear image 62, and the second linear image 63 are images in a three-dimensional space, but the image at the viewpoint of the imaging device 19 is a two-dimensional image. Therefore, the processing device 51 converts the first image IMC, the first linear image 62, and the second linear image 63 defined in the three-dimensional space, that is, the vehicle body coordinate system (Xm, Ym, Zm) onto the two-dimensional plane. Performs a perspective projection transformation that projects. The first image IMC, the first straight line image 62 and the second straight line image 63 converted into the image of the viewpoint of the imaging device 19 are hereinafter appropriately referred to as the guide image 60 .

FIG. 14 is a diagram showing the reference image 65 and the first image IMC shown in FIG. After the guide image 60 is generated, the process proceeds to step S107, and the processing device 51 generates the reference image 65. FIG. The reference image 65 is a line image along the surface WAS of the work target WA. The processing device 51 generates the reference image 65 using the information on the position of the work target WA, more specifically, the information on the position of the work target WA on the surface WAS.

The reference image 65 includes a plurality of first line images RL radially extending from a position corresponding to the Zm axis, which is the central axis of rotation of the upper rotating body 3, and a plurality of first line images RL extending radially from the Zm axis in the rotating direction Rtd of the upper rotating body 3. and a plurality of second line images CL extending along. In the embodiment, when viewed from the Zm-axis direction of the vehicle body coordinate system (Xm, Ym, Zm), the plurality of first line images RL radially extend from the Zm-axis and extend in the circumferential direction of a circle centered on the Zm-axis. is a line image arranged along the The plurality of second line images CL are images of arcs or circles extending along the circumferential direction of a circle centered on the Zm axis when viewed from the Zm axis direction of the vehicle body coordinate system (Xm, Ym, Zm), They are arranged along the radial direction of a circle centered on the Zm axis.

Since the first line image RL and the second line image CL are defined by the vehicle body coordinate system (Xm, Ym, Zm), they contain three-dimensional information. In the embodiment, the plurality of first line images RL are arranged at regular intervals of angle α along the circumferential direction of a circle centered on Zm. The plurality of second line images CL are arranged at regular intervals of distance ΔR along the radial direction of a circle centered at Zm.

After generating the first line image RL and the second line image CL, the processing device 51 converts them into images of the viewpoint of the imaging device 19 to generate a reference image 65 . By converting the first line image RL and the second line image CL into images of the viewpoint of the imaging device 19, the display device 52 deforms and displays the reference image 65 according to the shape of the work target WA. be able to.

Next, in step S108, the processing device 51 removes the occupation area SA described above from the guide image 60 and the reference image 65 that have been generated. Since the guide image 60 and the reference image 65 are generated from information on the shape of the work object WA, removing the occupied area SA from the guide image 60 and the reference image 65 does not remove the occupied area SA from the information on the shape of the work object WA. means to remove from The processing device 51 may generate the guide image 60 and the reference image 65 using information on the shape of the work target WA from which the occupied area SA has been removed.

In step S<b>108 , the processing device 51 converts the occupied area SA into an image of the viewpoint of the imaging device 19 and removes it from the guide image 60 and the reference image 65 . The processing device 51 generates a first image IMC, a first linear image 62, and a second linear image 63 before being converted into images of the viewpoint of the imaging device 19, and a first image IMC before being converted into images of the viewpoint of the imaging device 19. From the one line image RL and the second line image CL, the occupied area SA before being converted into the image of the viewpoint of the imaging device 19 may be removed.

FIG. 15 is a diagram showing an image 69 for work. In step S109, the processing device 51 synthesizes the guide image 60 from which the occupied area SA has been removed, the reference image 65, and the second image 68 of the work target WA captured by the imaging device 19, and Image 69 is generated. In step S<b>110 , the processing device 51 causes the display device 52 to display the generated work image 69 . The work image 69 is an image in which the image 68 of the work target WA, the reference image 65, and the guide image 60 are combined.

The reference image 65 is a plurality of line images extending on the surface WAS of the work target WA along the circumferential and radial directions of a circle centered on the central axis of revolving of the upper revolving body 3. By referring to the image 65, the position of the work target WA can be grasped. For example, the operator can grasp the depth, that is, the position of the upper revolving body 3 of the hydraulic excavator 1 in the front-rear direction from the second line image CL, and the position of the upper revolving body 3 in the revolving direction Rtd from the first line image RL. can be grasped.

Since the distance Rbt changes according to the distance between the bucket 8 and the Zm-axis, the first image IMC also moves away from the excavator 1 or approaches the excavator 1 according to the distance between the bucket 8 and the Zm-axis. Since the first image IMC moves according to the current position of the bucket 8, the operator grasps the positions of the work target WA and the bucket 8 by operating the work implement 2 while referring to the first image IMC. can. As a result, a decrease in work efficiency is suppressed. In addition, a decrease in work accuracy is suppressed.

By referring to the first image IMC and the second line image CL, the operator can determine that the position of the excavation target is farther than the bucket 8 when the upper rotating body 3 rotates with the current posture of the work machine 2. It can be easily grasped whether it is on the side or on the near side. As a result, a decrease in work efficiency is suppressed. In addition, a decrease in work accuracy is suppressed.

The first linear image 62 and the second linear image 63 indicate the position of the cutting edge 8T of the bucket 8 on the surface WAS of the work target WA. That is, the portion sandwiched between the first linear image 62 and the second linear image 63 on the surface WAS of the work target WA is the position of the cutting edge 8T of the bucket 8 . Therefore, the operator can more easily grasp the positional relationship between the bucket 8 and the work target WA from the first straight image 62 and the second straight image 63 . As a result, a decrease in work efficiency is suppressed. In addition, a decrease in work accuracy is suppressed.

The reference image 65 and the first image IMC are displayed along the shape of the work target WA, for example, the terrain on which the hydraulic excavator 1 works. The relative positional relationship between the image 65 and the first image IMC can be easily grasped. Furthermore, since the first line image RL and the second line image CL, which constitute the reference image 65, are arranged at equal intervals in the vehicle body coordinate system, the operator can easily grasp the sense of distance on the topographic surface. It becomes easier to grasp the sense of perspective.

In the embodiment, the work image 69 may include information 64 indicating the distance between the cutting edge 8T of the bucket 8 and the work target WA. The information 64 has the advantage that the operator can grasp the actual distance between the cutting edge 8T of the bucket 8 and the work target WA. The distance between the cutting edge 8T of the bucket 8 and the work target WA can be the distance from the cutting edge 8T at the center of the bucket 8 in the width direction Wb to the surface WAS of the work target WA.

The information 64 may be spatial position information regarding the work implement or work target WA. The spatial position information includes, in place of or in addition to the distance between the cutting edge 8T of the bucket 8 and the work target WA, information on the posture such as the angle of the bucket 8, information indicating the relative distance between the bucket 8 and the work target WA, Information indicating the relationship between, for example, the orientation of the cutting edge 8T of the bucket 8 and the orientation of the surface of the work target WA, information indicating the position of the bucket 8 in coordinates, information indicating the orientation of the surface of the work target WA, and the bucket 8 includes information such as information indicating the distance in the Xm direction in the vehicle body coordinate system to the cutting edge 8T of 8.

That is, the processing device 51 can determine the position of the bucket 8 which is a working tool, the attitude of the bucket 8, the position of the work object WA, the relative attitude of the work object WA, the relative distance between the bucket 8 and the work object WA, the bucket At least one of the relative postures between 8 and the work target WA may be obtained and displayed on the display device 52 .

<Reference image according to modification>
FIG. 16 is a diagram showing a reference image 65a according to a modification. The reference image 65a is different from the reference image 65 in which the vehicle body coordinate system is the polar coordinate system. It is an image of a grid formed by a plurality of second linear images 67 orthogonal to . The plurality of first linear images 66 are parallel to the Xm axis of the vehicle body coordinate system, and the plurality of second linear images 67 are parallel to the Ym axis of the vehicle body coordinate system. The intervals at which the plurality of first linear images 66 are arranged are equal. Also, the intervals at which the plurality of second linear images 67 are arranged are equal. The interval at which the plurality of first linear images 66 are arranged is equal to the interval at which the plurality of second linear images 67 are arranged.

The processing device 51 synthesizes the guide image 60 from which the occupied area SA has been removed, the reference image 65a, and the second image 68 of the work target WA captured by the imaging device 19 to generate a work image 69. do. The processing device 51 causes the display device 52 to display such a lattice image together with the guide image 60, so that the operator can easily grasp the positional relationship between the position of the bucket 8 and the work target WA during turning and excavation. can be done.

<3rd image>
FIG. 17 is a diagram showing an example of the first image IMC and the third image 61. FIG. The third image 61 is a line image connecting the positions Pt1 and Pt2 and along the surface WAS of the work target WA. The position Pt1 is the position where the straight line LV1 corresponding to the first straight line image 62 and the surface WAS of the work target WA intersect. The position Pt2 is the position where the straight line LV2 corresponding to the second straight line image 63 and the surface WAS of the work target WA intersect. The processing device 51 makes a third image 61 a set of positions of the surface WAS of the work target WA when a straight line connecting the first position Pt1 and the second position Pt2 is projected onto the surface WAS. A position Pt where a straight line parallel to the Zm axis of the vehicle body coordinate system extending from the cutting edge 8T at the center position in the width direction Wb of the bucket 8 intersects the surface WAS of the work target WA is part of the third image 61. . The position Pt is also part of the first image IMC.

The processing device 51 may cause the display device 52 to display the third image 61 in addition to the first image IMC. The third image 61 allows the operator to grasp the current position of the bucket 8 on the surface WAS of the work target WA. As a result, the operator can easily and reliably grasp the positional relationship between the bucket 8 and the work position. When the processing device 51 causes the display device 52 to display the first image IMC and the third image 61, the display modes of both may be different. To make the display form different, for example, the colors of the first image IMC and the colors of the third image 61 are made different, and the thickness of the lines of the first image IMC and the thickness of the lines of the third image 61 are made different. differentiating the line type of the first image IMC from the line type of the third image 61; and combining two or more of these. By making the display forms of the first image IMC and the third image 61 different, the operator can easily distinguish the third image 61 from the first image IMC.

<Control system of hydraulic excavator 1 according to modification>
FIG. 18 is a diagram showing a control system 1Sa of the hydraulic excavator 1 according to the modification. The image display system 100 and the remote control system 101 described above remotely controlled the hydraulic excavator 1 using the control device 53 of the facility 50 shown in FIG. In this modified example, a display device 52a is provided in the driver's cab 4 shown in FIG. In this modification, a work image 69 is displayed on the display device 52a in order to cause the hydraulic excavator 1 to assist the operator's work.

The control system 1Sa has a processing device 51 and an operation device 53a connected to the signal line 35 of the control system 1S. A display device 52 a is connected to the processing device 51 . The processing device 51 provided in the control system 1Sa has the same function as the processing device 51 provided in the facility 50 shown in FIG. 1 in the image display system 100 and the remote control system 101 described above. An image display system 100a according to a modification is configured by the processing device 51 and the display device 52a.

In a modified example, the processing device 51 may obtain the blade edge position P4 using the detection values of the orientation detection device 32 and the sensor controller 26, or the sensor controller 26 may use the detection values of the orientation detection device 32 to obtain the blade edge position P4. you may ask. In the former case, the position detection device 32, the sensor controller 26, and the processing device 51 correspond to a position detection section that detects the position of the work implement. In the latter case, the position detection device 32 and the sensor controller 26 correspond to a position detection section that detects the position of the work implement. The position detection unit may be a distance measurement device such as a stereo camera or a laser scanner as described above.

The display device 52a of the control system 1Sa is a head-up display that projects an image onto the front window FG of the driver's seat. The display device 52a may be a head mounted display. The display device 52a displays a working image 69 at a position aligned with the bucket 8 that can be seen through the front window FG. In this case, since the work target WA and the bucket 8 can be seen through the front window FG, the work image 69 displayed by the display device 52a should include at least the first image IMC. That is, when the display device 52a is a head-up display or a head-mounted display, the processing device 51 causes the display device 52a to display the first image IMC. In a modification, the reference image 65 is also displayed on the display device 52a in addition to the first image IMC.

The display device 52a is not limited to a head-up display, and may be a normal display. When the display device 52a is a normal display, the processing device 51 displays on the display device 52a a working image 69 obtained by synthesizing at least the first image IMC and the second image 68 captured by the imaging device 19. Let

The operating device 53a is a device for operating the hydraulic excavator 1, and includes a left operating lever 53La and a right operating lever 53Ra. The operating device 53a may be of a pilot hydraulic type or an electric type.

The hydraulic excavator 1 including the control system 1Sa includes at least the first image IMC when the work target WA is viewed from a predetermined position, for example, a position corresponding to the viewpoint of the operator seated in the driver's seat, by the image display system 100a. A working image 69 is displayed on the front window FG. Through such processing, the operator can easily and reliably grasp the positional relationship between the bucket 8 and the work position from the first image IMC displayed on the front window FG. As a result, the image display system 100a can suppress a decrease in work efficiency and a decrease in work accuracy. The farther the bucket 8 is from the vehicle body 1B of the hydraulic excavator, the more difficult it is for the operator to grasp the sense of perspective. Therefore, in such a case, the image display system 100a can suppress deterioration in work efficiency and work accuracy.

Also, even an inexperienced operator can easily grasp the perspective of the bucket 8 by using the hydraulic excavator 1 equipped with the image display system 100a. As a result, a decrease in work efficiency is suppressed. In addition, a decrease in work accuracy is suppressed. Furthermore, even in a situation where it is difficult for the operator to see the actual work target WA, such as during nighttime work, the operator can work while looking at the work image 69 displayed on the display device 52a. A decrease in efficiency and work accuracy is suppressed.

The image display systems 100 and 100a and the remote control system 101 superimpose the guide image 60 and the reference image 65 or 65a generated from the viewpoint of the imaging device 19 on the image 68 of the actual work target WA captured by the imaging device 19. Together, they are displayed on the display device 52 . Through such processing, the image display system 100 and the remote control system 101 display the position of the bucket 8 and the work target WA to the operator who remotely operates the hydraulic excavator 1 using the image of the work target WA displayed on the display device 52 . It is possible to make it easier to grasp the positional relationship with. As a result, a decrease in work efficiency is suppressed. In addition, a decrease in work accuracy is suppressed.

The first image IMC included in the guide image 60 extends along the revolving direction of the upper revolving body 3. Therefore, by referring to the guide image 60, the operator can see the bucket 8 and the operation when the upper revolving body 3 revolves. A relative positional relationship with the work point in the target WA can be easily grasped. As a result, the image display system 100 and the remote control system 101 can suppress a decrease in work efficiency and a decrease in work accuracy in a work machine having a revolving body.

Even an inexperienced operator can easily grasp the positional relationship between the position of the bucket 8 and the work point on the work target WA by using the image display systems 100 and 100a and the remote control system 101 . As a result, deterioration in work efficiency and work accuracy is suppressed. In addition, the image display system 100 and the remote control system 101 superimpose the guide image 60, the reference image 65 or 65a, and the image 68 of the actual work target WA on the display device 52 to display the image during work. It is possible to suppress a decrease in work efficiency by setting a single screen to which the operator pays attention.

In the reference image 65 or 65a, the intervals between adjacent first line images RL are equal, and the intervals between adjacent second line images CL are equal. Therefore, by superimposing and displaying the reference image 65 or 65a and the image 68 of the actual work target WA captured by the imaging device 19, it becomes easier to grasp the work point on the work target WA. Also, by superimposing the first image IMC of the guide image 60 and the reference image 65, the operator can easily grasp the distance that the bucket 8 has moved, thereby suppressing a decrease in work efficiency.

The guide image 60 and the reference image 65 or 65a have the occupied area SA, which is the area of the work machine 2, removed. 60 and the reference image 65 can be avoided from being superimposed and displayed. As a result, the image display system 100 and the remote control system 101 can display the working image 69 on the display device 52 in a form that is easy for the operator to see.

In the embodiment and modifications, the guide image 60 should include at least the first image IMC. That is, the guide image 60 does not have to include the first linear image 62 and the second linear image 63 . Further, the processing device 51 may change the display form of, for example, the first image IMC in the guide image 60 according to the distance between the cutting edge 8T of the bucket 8 and the work target WA. By doing so, the operator can easily grasp the distance between the position of the bucket 8 and the work target WA.

In the embodiment, the processing device 51 may cause the display device 52 to display at least the first image IMC and the second image 68 . Even in this case, the operator can refer to the first image IMC extending along the revolving direction Rtd of the upper revolving structure 3 to determine the relative position between the bucket 8 and the work point on the work target WA when the upper revolving structure 3 revolves. positional relationship can be easily grasped. As a result, at least the first image IMC and the second image 68 are displayed on the display device 52, thereby suppressing a decrease in work efficiency and a decrease in work accuracy in a work machine having a revolving body. .

In the embodiment, the processing device 51 generated the working image 69 in the vehicle body coordinate system (Xm, Ym, Zm), but the global coordinate system (Xg, Yg, Zg), the imaging device coordinate system (Xc, Yc, Zc) or the coordinate system of the distance detection device 20 (Xd, Yd, Zd) may be used to generate the working image 69 . If the working image 69 is generated in the global coordinate system (Xg, Yg, Zg), the GNSS antennas 21, 22 and the position calculator 23 are required. When the working image 69 is generated in the vehicle body coordinate system (Xm, Ym, Zm), the imaging device coordinate system (Xc, Yc, Zc), and the distance detection device 20 coordinate system (Xd, Yd, Zd), GNSS antennas 21, 22 and position calculator 23 are not required.

In the embodiment, the occupied area SA, which is the area of the work machine 2 , does not have to be removed from the guide image 60 and the reference image 65 . Even in this case, the first image IMC and the second image 68 displayed on the display device 52 allow the operator to understand the relative positional relationship between the bucket 8 and the work point on the work target WA when the upper swing body 3 swings. can be easily grasped. Therefore, in the work machine having the revolving body, a decrease in work efficiency is suppressed. Moreover, in a working machine having a revolving body, work accuracy is suppressed.

In the above-described embodiment, a part of the excavator 1 detected by the distance detection device 20, for example, the bucket 8 as described above is removed to obtain shape information (three-dimensional terrain data) of the work target WA. However, the 3D terrain data acquired in the past, for example, several seconds ago is stored in the storage unit 51M of the processing device 51, and the processing unit 51P of the processing device 51 stores the current work target WA and the stored 3D terrain data. It is also possible to determine whether the position is the same as the dimensional topographical data, and if the position is the same, the reference image 65 or 65a may be displayed using the past three-dimensional topographical data. In other words, the processing device 51 can display the reference image 65 or 65a if there is past three-dimensional topography data even if there is a topography hidden by a part of the hydraulic excavator 1 when viewed from the imaging device 19 . can.

<Example of image display in loading work>
In the embodiment and modified examples, an example of image display by the image display systems 100 and 100a will be described in a loading operation in which the hydraulic excavator 1 loads loads such as rocks and soil onto a vessel of a dump truck. The processing device 51 of the image display system 100, 100a acquires the position of the dump truck, which is the target of the loading operation, detected by the distance detection device 20. FIG. Since the first image IMC and the reference image 65 or 65a included in the working image 69 rise at the position of the dump truck, the operator can grasp the relationship between the working machine 2 and the height and position of the dump truck. By adding the position of the dump truck to the work image 69, the operator can determine at what position the bucket 8 will approach the dump truck when the upper rotating body 3 is rotated to bring the bucket 8 of the working machine 2 closer to the dump truck. you can figure out how to get there. Therefore, interference between the work implement 2 and the dump truck is suppressed.

The processing device 51 may handle the position of the dump truck detected by the distance detection device 20 as part of the work target WA, or may receive the position of the dump truck from the management server or the like via the communication device 25 shown in FIG. may be obtained. In the latter case, the processing device 51 may apply information of the model of the dump truck to the obtained position of the dump truck to obtain the position of the dump truck.

The processing device 51 compares the height of the dump truck and the height of the working machine 2, specifically the height of the cutting edge 8T of the bucket 8, and changes the display form of the first image IMC according to the comparison result. good. Through such processing, the operator can grasp the relationship between the height of the work implement 2 and the height of the dump truck, thereby suppressing interference between the work implement 2 and the dump truck. When changing the display form of the first image, for example, if the height of the work implement 2 is lower than the height of the dump truck, the processing device 51 displays the first image IMC in red. 2, the first image IMC can be displayed in orange, and if the height of the work implement 2 is higher than the height of the dump truck, the first image IMC can be displayed in green.

When at least one of the third image 61 and the first linear image 61 and the second linear image 62 is displayed together with the first image IMC, the processing device 51 displays the first image IMC together with the first image IMC according to the height of the dump truck. The display form of at least one of the third image 61 and the first linear image 61 and the second linear image 62 may be changed. Such processing makes it easier for the operator to grasp the relationship between the height of the work implement 2 and the height of the dump truck.

In the embodiment and modifications, the type of work machine 2 and the type of work machine are not limited as long as the work machine includes a revolving body having the work machine 2 .

Although the embodiments and modifications have been described above, the embodiments are not limited by the above-described contents. In addition, the components described above include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within the so-called equivalent range. Furthermore, the components described above can be combined as appropriate. Furthermore, at least one of various omissions, replacements, and modifications of components can be made without departing from the gist of the embodiments and modifications.

1 Hydraulic Excavator 1B Vehicle Main Body 1S, 1Sa Control System 2 Work Machine 3 Upper Revolving Body 8 Bucket 8B Blade 8T Cutting Edge 19 Imaging Device 20 Distance Detecting Device 23 Position Computing Device 50 Facility 51 Processing Device 51IO Input/Output Unit 51M Storage Unit 51P Processing Unit 52, 52a Display device 60 Guide image 61 Third image 62 First linear image 63 Second linear image 65, 65a Reference image 68 Second image 69 Work images 100, 100a Image display system for working machine (image display system)
101 Remote control system for working machine (remote control system)
CL Second line image RL First line image FG Front window IMC First image Rtd Turning direction WA Work target WAS Surface Wb Width direction

Claims (6)

An image display system for a work machine applied to a work machine having a work tool and a revolving body to which the work machine is attached,
A display image including a straight line image extending from an end in the width direction of the work tool to a work target of the work machine and a line image extending in the width direction of the work tool from one end of the straight line image is displayed on a display device. Including a processing device to display,
Image display system for working machines. wherein the linear image extends in the vertical direction from a widthwise end of the work implement;
The image display system for a working machine according to claim 1. the line image extends outside the bucket width;
The image display system for a working machine according to claim 1 or 2. The processing device synthesizes the display image and the image of the work target and causes the display device to display the synthesized image.
The image display system for a working machine according to any one of claims 1 to 3. The processing device causes the display device to display information about a transport vehicle loaded by the work machine.
The image display system for a working machine according to any one of claims 1 to 4. The display device is provided outside the working machine,
The image display system for a working machine according to any one of claims 1 to 5.

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