JP2014116963A - Rear view field display system of transporter vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an image behind a transport vehicle to be checked not only when the transport vehicle travels backward but also during or after discharging soil.SOLUTION: A rear view field display system of a transport vehicle is configured to image a field of view behind a vehicle body by a camera 10 mounted to a rear portion of the vehicle body of the transport vehicle provided with a vessel 110 and to display the imaged image on the display section. In a case where the vessel 110 is not seated, the rear view field display system displays an image imaged by the camera 10 on a display section. In response to a signal representing lifting up of the vessel, the system displays an image representing the field of view behind the vehicle body of the transport vehicle on the display section.

Description

  The present invention provides a rear view display system for a transport vehicle that captures a field of view behind the vehicle body with a camera attached to the rear of the vehicle body of the transport vehicle having a vessel and displays the captured image on a display unit provided in a driver's cab or the like. About.

  A transport vehicle such as a dump truck has a vessel on which a load is loaded, and at the time of earth removal work, the vehicle moves backward and raises the vessel to discharge the load to the earth removal site.

  The transport vehicle has a large blind spot behind the vehicle body, and it is difficult to visually confirm the field of view behind the vehicle body directly from the cab. For this reason, conventionally, in a transport vehicle, a rear view of photographing a field of view behind the vehicle body by a camera attached to the rear of the vehicle body, and displaying the photographed image on a display unit of a monitor provided in the cab is used to confirm the rear. A field of view display system has been adopted and various patent applications have been filed.

  In Patent Document 1 below, a camera is mounted on the upper part of a rear combination lamp composed of a plurality of lamps such as a dump truck stop lamp, turn signal, and tail lamp, and an image of the rear of the vehicle taken by the camera when driving backward is driven. The invention of checking with an indoor monitor is described.

Japanese Patent Application Laid-Open No. 11-255018

  As shown in the above-mentioned Patent Document 1, a transport vehicle such as a dump truck is generally capable of confirming a captured image of a camera on a monitor only when a shift lever is switched to a reverse speed position. .

  Here, a series of operations when a transport vehicle such as a dump truck performs a soil removal operation is as follows.

(A) The shift lever is positioned at the reverse speed position R, and the transport vehicle is moved back to the earth discharging position (when the transport vehicle is moving backward)
(B) When the transport vehicle reaches the soil removal position, it stops and places the shift lever in the neutral position N (neutral) and raises the vessel (body) with the hoist lever in the “up” position to discharge the load. Soil (when the vessel rises when the transport vehicle stops and raises the vessel)
(C) When the earth has been discharged, the hoist lever is moved to the “down” position and the vessel (body) is lowered (when the vessel is lowered while the vessel is being lowered).
(D) Position the shift lever at the forward speed position F and move away from the soil removal point (during forward travel when the transport vehicle finishes soil removal and starts from the soil removal point).
In the prior art, only the image of the camera is displayed on the monitor when the vehicle reverses as shown in (a) above, and the vessel rises and falls as shown in (b), (c) and (d) above. The image behind the vehicle could not be confirmed on the monitor while the vehicle was moving forward, that is, during or after soil removal.

  The present invention has been made in view of such circumstances, and it is a solution to be able to check an image of the rear of the vehicle not only when the transporting vehicle is moving backward, but also during or after soil removal. To do.

The first invention is
In the rear view display system of the transport vehicle that captures the field of view behind the vehicle body with a camera attached to the rear of the vehicle body of the transport vehicle equipped with the vessel and displays the captured image on the display unit, when the vessel is not seated, A display control means for displaying a photographed image of the camera on a display unit is provided.

The second invention is
The first invention is characterized in that an image showing a field of view behind the vehicle body of the transporting vehicle is displayed on the display unit based on a signal indicating that the vessel is rising.

The third invention is
In the first invention, an image showing a field of view behind the vehicle body of the transporting vehicle is displayed on the display unit based on a signal indicating that the vessel is descending.

The fourth invention is
In the first invention, when the current shift position is a neutral position and the vessel is not seated, the display control means displays an image showing the field of view behind the vehicle body of the transport vehicle on the display unit. It is characterized by.

The fifth invention
In the first invention, the display control means is the case where the current vehicle speed is less than or equal to a predetermined value or the shift position is within a predetermined time after switching from the neutral position to the forward speed position, and the vessel is seated. If not, an image showing the field of view behind the vehicle body of the transport vehicle is displayed on the display unit.

The sixth invention
In the fifth invention, the display control means displays the display on the display unit when the current vehicle speed exceeds the predetermined value or when the shift position exceeds the predetermined time after switching from the neutral position to the forward speed position. It is characterized by being turned off.
The seventh invention
In the first aspect of the invention, the display unit displays an earthing area indicating an area where the load of the vessel is earthed on the image captured by the camera.

  According to the present invention, an image behind the vehicle can be confirmed during or after earth removal.

  In particular, according to the seventh aspect, since the earth discharge area where the load is discharged can be confirmed during or after the earth is discharged, it is possible to check how the load is settled at the unloading place.

FIGS. 1A and 1B are diagrams showing a camera mounting position on a vehicle body when the vehicle is a dump truck. FIG. 2 is a system configuration diagram including a rear view display system. FIG. 3 is an internal block diagram of the rear view monitor. 4 (a), (b), (c), (d), and (e) are diagrams showing screens displayed on the main monitor display unit, and are diagrams showing a rear view monitor setting screen. (F), (g), (h), and (i) are displayed on the rear view monitor display unit corresponding to FIGS. 4 (a) and (b), (c), (d), and (e), respectively. FIG. FIGS. 5A and 5B are diagrams showing display examples of the earth removal area, respectively. 6A and 6B are diagrams in which the soil removal area is superimposed on the field of view of the camera, FIG. 6A is a view of the soil removal area as viewed from above, and FIG. 6B is a diagram corresponding to FIG. It is the figure which looked at the earth removal area | region from the side. FIG. 7 is a diagram illustrating a process for setting a soil removal area when the vehicle is a dump truck. FIG. 8 is a flowchart illustrating the processing procedure of the embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a rear view display system for a transport vehicle according to the present invention will be described with reference to the drawings. Hereinafter, a description will be given assuming a dump truck (hereinafter referred to as a vehicle) as a transport vehicle. There are rigid dump trucks and articulated dump trucks. The articulated dump truck is a dump truck having a configuration in which a front frame is connected to a rear frame in a refractive manner. In the present embodiment, description will be made assuming an articulated dump. In the specification, the “left” side of the vehicle body means the left side when the front is viewed from the driver's seat, and the “right” side of the vehicle body is the right side when the front is viewed from the driver's seat. It shall be said. In the following description, it is assumed that the image of the camera is displayed on the monitor of the cab of the vehicle. However, in addition to the monitor of the cab, the display on the monitor of the base station of the unmanned dump truck system is naturally performed. Is possible.
FIG. 1 is a diagram illustrating a mounting position of a rear-view imaging camera 10 (hereinafter referred to as a camera) to a vehicle body when the vehicle 100 is a dump truck. FIG. 1A is a view showing a side surface of the vehicle 100, and FIG. 1B is a view of the rear portion of the vehicle body of the vehicle 100. The dump truck 100 is a transport vehicle provided with a cab 120 and a vessel (body) 110 on which loads can be loaded on the front frame 102F and the rear frame 102R, respectively.

The vessel 110 is raised or lowered by the hoist cylinder 110a. The hoist cylinder 110a is operated by a switching operation of a hydraulic valve (not shown).
The camera 10 is mounted above the rear axle 101 and at an upper part of the rear combination lamp 103 mounted on the rear frame 102R, preferably at an upper central position. The rear combination lamp 103 is composed of a plurality of lamps such as a stop lamp, a turn signal, and a tail lamp. FIG. 1 shows a state where the vessel 110 is seated. The camera 10 is disposed so as to be positioned in front of the rear end position S1 of the rear wheel tire 104. It is desirable to attach the camera 10 at a position where the earth and sand jumped up at the rear of the vehicle body does not adhere.
In FIG. 1A, the hatched portion indicates the field of view (shooting range) of the camera 10. The camera 10 captures the field of view behind the vehicle body. A rear wheel tire 104 enters the field of view of the camera 10.

  6A and 6B are diagrams in which the soil removal region V is superimposed on the field of view of the camera 10, FIG. 6A is a view of the soil removal region V as viewed from above, and FIG. 6B is a diagram in FIG. It is the figure which looked at the actual earth removal area | region V 'from the side in the corresponding figure.

  As can be seen from FIG. 6A, the soil removal area V is generally in a range wider than the vehicle width of the vehicle 100. In FIG. 6A, the region indicated by the alternate long and short dash line indicates the soil removal region V ′ where the load is actually discharged. However, for the convenience of display in the image of the camera 10, the earth removal area V is represented by being approximated to a rectangular shape. That is, the soil removal area V (a two-dimensional area on the road surface) includes a right vehicle width direction position guide line 11R, a left vehicle width direction position guide line 11L, a vehicle body front direction position guide line 12F, and a vehicle body rear direction position guideline. It is represented by a region surrounded by the line 12R.

FIG. 2 shows a system configuration diagram of the rear view display system.
A rear view monitor 20 that displays an image of the camera 10 on the display unit 21 is disposed in a front console (not shown) in the cab 120 of the vehicle 100 and in front of the driver's seat.

  The display unit 21 of the rear view monitor 20 is configured by a liquid crystal display, for example. A luminance adjustment switch 22 is disposed below the display unit 21 of the rear view monitor 20. The luminance adjustment switch 22 is a switch for adjusting the luminance (brightness) of the screen of the display unit 21 and also serves as a setting operation switch described later. The brightness adjustment switch 22 is constituted by a seesaw switch, for example.

  On the left side of the rear view monitor 20, a main monitor 30 for displaying various information on the display unit 31 is disposed. The display unit 31 of the main monitor 30 is composed of, for example, a liquid crystal display. A speedometer 107 and an engine tachometer 108 are arranged on the right side of the display unit 31 of the main monitor 30.

The shift lever 109 is arranged on the right side of the front as viewed from the driver's seat. For this reason, in consideration of operability, the switch panel 40 is disposed on the left side of the front console (not shown) opposite to the shift lever 109 and below the front console.
On the switch panel 40, there are arranged operation switches 41 for performing an operation for setting display contents of the display unit 21 of the rear view monitor 20.
The rear view monitor 20, the main monitor 30, and the switch panel 40 are connected to each other through a communication line 50 that performs serial communication. For example, the camera 10 is connected to the rear view monitor 20 via a video signal line 55 of the NTSC signal standard.

  A video signal indicating an image of the field of view behind the vehicle body taken by the camera 10 is sent to the rear view monitor 20 via the video signal line 55 and displayed on the rear view monitor display unit 21.

The rear view monitor 20, the main monitor 30, and the switch panel 40 are connected to a monitor controller 60 via a communication line 50 so as to communicate with each other. The monitor controller 60 is further connected to a T / M (transmission) controller 51, an RH (retarder, hoist) controller 52, and an engine controller 53 via a communication line 50 so as to be communicable with each other.
The T / M controller 51 is a controller that controls a transmission (not shown), and a sensor 109 a that detects the shift position of the shift lever 109 is connected via a sensor signal line 56. A signal indicating the shift position of the shift lever 109 is sent from the sensor 109 a of the shift lever 109 to the T / M controller 51 via the sensor signal line 56.

The T / M controller 51 controls the transmission so that a shift according to the shift position of the shift lever 109 is performed. Further, the T / M controller 51 sends a command signal for the transmission, that is, a signal indicating the speed stage currently selected in the transmission, that is, a signal indicating the actual speed stage, to the monitor controller 60 via the communication line 50. Further, the T / M controller 51 calculates the actual speed of the vehicle 100 (hereinafter referred to as the actual vehicle speed) based on the currently selected speed stage and the rotational speed of each input / output shaft of the transmission (not shown). A signal indicating the speed is sent to the monitor controller 60 via the communication line 50.
The sensor 109 a of the shift lever 109 is connected to the rear view monitor 20 via the sensor signal line 57. A signal indicating the shift position of the shift lever 109 is sent from the sensor 109 a of the shift lever 109 to the rear view monitor 20 via the sensor signal line 57.

The cab 120 is provided with a hoist lever 111. Further, a position sensor 112 for detecting the rising / lowering position of the vessel 110 is provided. The position sensor 112 is configured by an on / off switch that is turned on when the vessel 110 is seated on the rear frame 102R by the operation of the hoist cylinder 110a and turned off when the other vessels 110 are not seated on the rear frame 102R. Has been.
Whether the vessel 110 is seated on the rear frame 102R or not can be determined by using a detecting means other than the position sensor 112, for example, a detecting means for detecting the cylinder stroke position of the hoist cylinder 110a. it can.
The RH controller 52 is a controller that controls the adjustment of a retarder (brake) (not shown) and the rise and fall of the vessel 110, and a sensor 111 a that detects the operation position of the hoist lever 111 is connected via a sensor signal line 58. The position sensor 112 is connected via a sensor signal line 59. A hoist lever operation signal indicating the hoist lever operation position is sent from the sensor 111a of the hoist lever 111 to the RH controller 52 via the sensor signal line 58, and a signal indicating the vessel position is transmitted from the position sensor 112. It is sent to the RH controller 52 via the sensor signal line 59. The RH controller 52 controls the raising and lowering of the vessel 110 according to the hoist lever operation signal. Further, the RH controller 52 sends a hoist lever operation signal to the monitor controller 60 via the communication line 50.

  The engine controller 53 is a controller that controls an engine (not shown).

  The monitor controller 60 is connected to the main monitor 30 via the video signal line 54.

  By operating the operation switch 41 of the switch panel 40, it is possible to perform settings such as the D range start speed stage and the display contents of the rear view monitor 20. The D range start speed stage is a speed stage selected at the start when the shift lever 109 is positioned in the D (drive) range. The D range start speed stage is set in consideration of the slipperiness of the road surface and the like.

  The display unit 31 of the main monitor 30 is switched to a rear view monitor setting screen or a normal screen according to the operation of the operation switch 41 of the switch panel 40.

Various menus for setting the display contents of the rear view monitor display unit 21 are displayed. The normal screen displays vehicle information necessary for running and working, that is, engine cooling water temperature, hydraulic oil temperature, fuel remaining amount, service meter (cumulative engine operating time), various cautions, and the like. Engine cooling water temperature, hydraulic oil temperature, fuel remaining amount, service meter (cumulative engine operating time), various cautions, and the like are detected by sensors and input to the engine controller 53 and the like as sensor signals. These sensor signals are sent to the monitor controller 60 via the engine controller 53 and the like.
When an operation for switching to the normal screen is performed by the operation switch 41 of the switch panel 40, a signal indicating the operation content of the switch panel operation switch 41 is sent to the monitor controller 60 via the communication line 50. In response to this, the monitor controller 60 constructs a normal screen in combination with the vehicle information described above, and sends a video signal for displaying the constructed normal screen to the main monitor 30 via the video signal line 54. In accordance with the video signal, the main monitor display unit 31 displays a normal screen.

  When the operation switch 41 of the switch panel 40 is used to select a menu on the rear view monitor setting screen while the vehicle is stopped, a signal indicating the operation content of the switch panel operation switch 41 passes through the communication line 50. And sent to the monitor controller 60. In response to this, the monitor controller 60 sends a signal indicating the setting according to the operation content to the rear view monitor 20 via the communication line 50. The rear view monitor 20 processes the camera video sent from the camera 10 according to the set content, and generates a display signal. In addition, a control signal is generated so that shooting according to the set content is performed. As a result, an image corresponding to the display signal is displayed on the rear view monitor display unit 21. The camera 10 performs shooting according to the control signal.

  By operating the operation switch 41 of the switch panel 40, for example, the following display content setting operation can be performed on the rear view monitor display unit 21.

a) Setting operation for switching between normal image and mirror image This is the same as when the image captured by the camera 10 and displayed on the rear view monitor display unit 21 is a normal image (image similar to visual observation) or a mirror image (projected in a mirror). This is a setting operation for switching the image. In the present embodiment, it is assumed that all images displayed on the rear view monitor display unit 21 are normal images.
b) Setting operation of the position of the earth removal area V The earth removal area V includes the right vehicle width direction position guide line 11R, the left vehicle width direction position guide line 11L, the vehicle body front position guide line 12F, and the vehicle body rear position. It is represented by a region surrounded by the reference line 12R (FIG. 6A). By this setting operation, the positions of the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body longitudinal direction position guide lines 12F and 12R in the image can be arbitrarily changed. When setting the positions of the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines 12F and 12R, the captured image of the camera 10 is displayed on the rear view monitor display unit 21 and the current Left and right vehicle width direction position guide lines 11L and 11R and vehicle body front and rear direction position guide lines 12F and 12R corresponding to the setting operation are displayed superimposed on the captured image of the camera 10. In addition, when performing the setting operation of the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines 12F and 12R, the brightness adjustment switch 22 is used for the left and right vehicle width direction position guide lines 11L, 11R functions as a setting operation switch for finely adjusting the setting positions of the vehicle body longitudinal direction reference lines 12F and 12R.
c) On / off setting operation of the display of the earth removal area V This is whether or not to display the earth removal area V in the image displayed on the rear view monitor display unit 21, that is, the display of the earth discharge area V. It is an operation to set whether to turn on or off. In the following description, it is assumed that the display of the soil removal area V is set to ON.
FIG. 3 is an internal block diagram of the rear view monitor 20. The CPU 23 shown in FIG. 3 constitutes display control means of the present invention.

  A signal transmitted from the monitor controller 60 is input to the CPU 23 via the communication interface 24.

  A signal indicating the operation content of the brightness adjustment switch 22 is input to the CPU 23 via the on / off input circuit 25. A signal indicating the shift position of the shift lever 109 is input to the CPU 23 via the on / off input circuit 5.

  A video signal indicating an image of the field of view behind the vehicle body taken by the camera 10 is input to the CPU 23 via the camera video input circuit 26.

  When a signal indicating the setting operation of the rear view monitor setting screen is input from the monitor controller 60 to the CPU 23, the data of the setting operation content is stored in the nonvolatile memory 27.

  When the setting operation content stored in the nonvolatile memory 27 is a setting for switching between the normal image and the mirror image of the camera 10, the CPU 23 sends a signal indicating the setting content to the camera normal image / mirror image switching output circuit 28. Output to. The camera normal image / mirror image switching output circuit 28 generates a control signal for causing the camera 10 to capture a normal image or a control signal for causing the camera 10 to capture a mirror image according to the set content. Output. Accordingly, the camera 10 captures a normal image or a mirror image.

  When the setting operation content stored in the nonvolatile memory 27 is the setting of the position of the earth removal area V, the CPU 23 sets the setting operation in the image based on the setting content and the video of the camera 10. A display signal is generated so that the earth removal area V is located at the position. The display signal is output to the display controller 29. The display controller 29 controls the display of the rear view monitor display unit 21 according to the display signal. As a result, the earth removal area V is superimposed and displayed at the set position in the image displayed on the rear view monitor display unit 21.

  Below, the procedure of the setting operation of the earth removal area | region V is demonstrated.

(Procedure for setting the soil removal area V)
With reference to the screen transition diagram shown in FIG. 4, the procedure for setting the position of the earth removal area V according to the embodiment will be described.
4, FIGS. 4 (a), (b), (c), (d), and (e) shown on the left in the drawing are diagrams showing screens displayed on the main monitor display unit 21, respectively. It is a transition diagram of a setting screen. 4 (f), (g), (h), and (i) correspond to FIGS. 4 (a) and (b), (c), (d), and (e), respectively, and the rear view monitor display unit 21. It is a transition diagram of a screen displayed on the screen. The screen changes according to the black arrow (→) in the figure. A white arrow (⇒) in the figure indicates a box currently selected in the menu of the rear view monitor setting screen.

In the initial state, a captured image of the camera 10 is displayed on the rear view monitor display unit 21. In order to set the earth removal area V from this state, a box for “earth disposal area position setting” is selected by the switch panel operation switch 41 from the menu of the rear view monitor setting screen (FIG. 4A). Then, the rear view monitor setting screen transits to the next point selection menu screen (FIG. 4B). Accordingly, the rear view monitor display unit 21 displays the initial positions of the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines 12F and 12R superimposed on the captured image of the camera 10 (FIG. 4). (F)).
Here, the vehicle body rearward position guide line 12R intersects with the right vehicle width direction position guide line 11R at point 1, and at point 2 with the left vehicle width direction position guide line 11L. Further, the vehicle body front direction position guide line 12F intersects the right vehicle width direction position guide line 11R at the point 3 and also intersects the left vehicle width direction position guide line 11L at the point 4.

  In the image of the rear view monitor display unit 21, a display indicating the locations of point 1, point 2, point 3, and point 4 where position setting is performed is made. That is, “1”, “2”, “3”, and “4” that are marks for the operation of the operator are displayed at locations corresponding to the points 1, 2, 3, and 4 where the position is set in the image. .

  The left-right direction in the figure of the image of the rear view monitor display unit 21 is defined as “X direction”, and the vertical direction in the figure is defined as “Y direction”.

Next, when the “point 1” box is selected by the switch panel operation switch 41 from the point selection menu on the rear view monitor setting screen (FIG. 4B), the point 1 in the image on the rear view monitor display unit 21 is displayed. An auxiliary line 13 serving as an auxiliary for moving the point 1 in the X direction is displayed (FIG. 4G). The auxiliary line 13 and the auxiliary line 14, which will be described later, are configured by cross lines having different colors from these reference lines so that they can be distinguished from the left and right vehicle width direction position reference lines 11L and 11R and the vehicle body longitudinal direction position reference lines 12F and 12R. Yes. The reason for the cross is to make it easier to understand the intersection of the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines 12F and 12R. Further, the length of each line constituting the cross line changes according to the moving direction so that the moving direction can be understood. When adjusting the intersection point in the X direction, the auxiliary line 13 in which the length of the X direction line of the cross lines is longer than the length of the Y direction line (FIG. 4G) is used. When adjusting the intersection point, the auxiliary line 14 is used in which the length of the Y direction line of the cross lines is longer than the length of the X direction line (FIG. 4H).
Further, the brightness adjustment switch 22 is switched to a setting operation switch for finely adjusting the setting position of the point 1 in the image (setting positions of the right vehicle width direction position guide line 11R and the vehicle body rearward direction position guide line 12R) (FIG. 4 ( g)). Further, the rear view monitor setting screen transitions to the next X-direction position adjustment screen (FIG. 4C).

  Thereafter, when the brightness adjustment switch 22 (seesaw switch) is operated, the point 1 together with the auxiliary line 13 in the left and right direction according to the operation direction and the auxiliary line 13 in the image of the rear view monitor display unit 21. It moves in the X direction (see FIG. 4G; broken line arrow).

  When the X direction position of the point 1 is determined, an operation for determining the X direction position of the point 1 is performed by the switch panel operation switch 41. In response to this operation, the rear view monitor setting screen transits to the next Y direction position adjustment screen (FIG. 4D), and point 1 is set to point 1 in the image of the rear view monitor display unit 21 in the Y direction. An auxiliary line 14 serving as an auxiliary for moving is displayed. The brightness adjustment switch 22 continues to function as a setting operation switch.

  Thereafter, when the brightness adjustment switch 22 (seesaw switch) is operated, the point 1 together with the auxiliary line 14 in the up and down direction according to the operation direction and the auxiliary line 14 in the image of the rear view monitor display unit 21. Move in the Y direction (see FIG. 4 (h); dashed arrow).

  When the Y direction position of the point 1 is determined, an operation for determining the Y direction position of the point 1 is performed by the switch panel operation switch 41. In response to this operation, the rear view monitor setting screen transitions to the next point selection menu screen (FIG. 4 (e)), and it is assumed that the setting of point 1 has been completed. The auxiliary line 14 is erased. Further, the X and Y coordinate positions of the set point 1 are stored in a predetermined memory. Also, the brightness adjustment switch 22 switches to the original brightness adjustment function.

Thereafter, for points 2, 3 and 4 in the same manner, “Point 2”, “Point 3” and “Point 4” are selected from the point selection menu on the rear view monitor setting screen, and the same as described above. By performing the processing, the position of each point can be set.
Accordingly, the positions of the left and right vehicle width direction position guide lines 11L and 11R and the positions of the vehicle body front and rear direction position guide lines 12F and 12R are adjusted, and the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines. The position, size, and shape of the soil removal area V surrounded by 12F and 12R can be adjusted.
Next, a procedure for setting the earth removal area V will be described.

  When setting the earth removal area V, as shown in FIG. 7, each point of the road surface corresponding to point 1, point 2, point 3, and point 4 to be set, point 1 and point 2 to be set, The pylon 200 is installed at the intermediate point, the intermediate point between the point 3 and the point 4, the intermediate point between the point 1 and the point 3, and the road surface corresponding to the intermediate point between the point 2 and the point 4.

Next, an operator such as an operator or a serviceman moves the auxiliary lines 13 and 14 on the screen with the pylon 200 reflected in the image of the rear view monitor display unit 21 as a mark in the same procedure as in FIG. The positions of 1, 2, 3, and 4 are adjusted, and the earth removal area V is set so as to have a desired position, size, and shape. That is, the front, back, left and right positions of the area surrounded by point 1, point 2, point 3, and point 4, the size of the area surrounded by points 1 to 4, and the figure surrounded by points 1 to 4 (for example, a rectangle) ).
As described above, the work for setting the earth removal area V is performed.

  When the setting work for the earth removal area V as described above is completed, the operation switch 41 of the switch panel 40 is operated to switch the main monitor display unit 31 to the normal screen. Thus, the operator can obtain vehicle information necessary for traveling and working from the main monitor display unit 31, and can perform traveling and working.

  Further, what is to be displayed on the rear view monitor display unit 21 when the main monitor display unit 31 is switched to the normal screen is selected. When the display of “earth removal area V” is selected, the earth removal area V is displayed on the rear view monitor display unit 21 while being superimposed on the image captured by the camera 10 during traveling and working. As a result, the operator can move the vehicle 100 backward with reference to the soil removal area V while confirming the soil removal area V in the camera image. Will be able to unload the load.

  As described above, in this embodiment, the position, shape, and size of the soil removal area V are set by manually adjusting the positions of the points 1, 2, 3, and 4 in the image. For this reason, even if the model of the vehicle 100 and the number of units are different, the position to be earthed, the shape of the area to be earthed, and the area of the cargo to be earthed differ easily. The soil removal area V can be accurately set so as to have the same position, shape and size.

Even if the soil removal area V is the same vehicle 100, the position, size, and shape of the soil removal area vary depending on the state of the load, that is, the amount and type of the load.
Therefore, a plurality of soil removal areas V having different positions, sizes, and shapes are set according to the state of the load of the vehicle 100, and the soil removal areas V corresponding to the current state of the load are included in the image of the camera 10. You may make it display on.

  In this case, the current state of the load is automatically determined, and the soil removal region V having the optimum position, size and shape for the current state of the load is automatically selected to correspond to the current state of the load. The earth removal area V to be displayed may be displayed in the image of the camera 10. For example, it is conceivable to provide a weight sensor for detecting the weight of the vessel 110 and select the optimum soil removal region V according to the detection value of the weight sensor.

  In addition, the operator determines the current load state, manually selects the soil discharge region V having the optimum position, size, and shape for the current load state, and then selects the soil discharge region corresponding to the current load state. V may be displayed in the image of the camera 10. For example, the operator may instruct the type of load and the weight of the load by operating a switch, and the earthing area V corresponding to the instructed type of load and the weight of the load may be displayed in the image of the camera 10.

  In the embodiment described above, the earth removal area V is described as an area surrounded by four lines, that is, the left and right vehicle width direction position guide lines 11L and 11R and the vehicle body front and rear direction position guide lines 12F and 12R. However, the soil removal area V is not necessarily represented by four lines.

For example, as shown in FIG. 5 (a), an area in the image corresponding to the earth removal area V may be displayed so that the image background area and the shade (brightness) of the pixel are different, as shown in FIG. 5 (b). As shown, the left and right vehicle width direction position guide lines 11L and 11R may be omitted, and the soil removal area V may be displayed as being sandwiched between the vehicle body front and rear direction position guide lines 12F and 12R, or only one of them. May be displayed.
The captured image of the camera 10 is displayed on the rear view monitor display unit 21 when the earth removal work is being performed.

  Here, “when the earth removal work is performed” corresponds to a series of operations during the earth removal work described below.

(A) The shift lever 109 is positioned at the reverse speed position R and the vehicle 100 is moved backward to the earth discharging position (when the vehicle 100 is moving backward)
(B) When the vehicle 100 reaches the soil removal position, the vehicle 100 stops and the shift lever 109 is positioned at the neutral position N (neutral), the hoist lever is moved to the “up” position, the vessel (body) is raised, Destroy (when vehicle 100 stops and vessel 110 is raised)
(C) When the earth is discharged, the hoist lever 111 is moved to the “lower” position and the vessel (body) 110 is lowered (when the vessel is lowered while the vessel is being lowered).
(D) The shift lever 109 is positioned at the forward speed position F and is separated from the soil removal point. When the vessel 110 is not completely seated, it often leaves the soil removal point (when the vehicle 100 completes the soil removal and moves forward from the soil removal point).
FIG. 8 is a flowchart showing a processing procedure for controlling whether to display or hide the captured image of the camera 10 on the rear view monitor display unit 21 (to turn off the display of the rear view monitor display unit 21).

  A signal indicating information such as the actual vehicle speed necessary for the control shown in FIG. 8 may be sent from the monitor controller 60 to the rear view monitor 20, and the CPU 23 of the rear view monitor display unit 21 may perform a series of processes shown in FIG. A series of processing shown in FIG. 8 may be performed by the monitor controller 60 so that a signal instructing whether to display the image captured by the camera 10 or not is sent to the rear view monitor 20.

  That is, when the position of the shift lever 109 is the reverse speed position R (determination Y in step 201), it is determined that the vehicle 100 is moving backward toward the soil removal point, that is, the state (a). Then, the video of the camera 10 is displayed on the rear view monitor display unit 21 (step 205).

  Further, when the position of the shift lever 109 is not the reverse speed position R (determination N in step 201) and the position of the shift lever 109 is the neutral position N (neutral) (determination Y in step 202), Next, based on the hoist lever operation signal, it is determined whether or not the hoist lever 111 has been operated to the “raised” position or “lowered” position (step 203). As a result, when the hoist lever 111 is operated to the “raised” position or “lowered” position (determination Y in step 203), the vehicle 100 is stopped and the vessel 110 is raised, or the vehicle 100 Is stopped and the vessel 110 is lowered. That is, it is determined that the state is (b) or (c), and the video of the camera 10 is displayed on the rear view monitor display unit 21 (step 205). However, when the hoist lever 111 is not operated to the “raised” position or “lowered” position (determination N in step 203), the display of the rear view monitor display unit 21 is turned off and the video of the camera 10 is not displayed. (Step 206).

If the position of the shift lever 109 is not the neutral position N (neutral) (determination N in step 202), it is determined that the position of the shift lever 109 is in the forward speed position F (D range), and the process proceeds to step 204. To do. In step 204, based on the hoist lever operation signal, the signal indicating the actual vehicle speed, and the signal indicating the set vehicle speed, it is determined whether or not the following conditions 1) and 2) are both satisfied. The set vehicle speed is set, for example, by the monitor controller 60 and sent from the monitor controller 60 to the CPU 23 of the rear view monitor display unit 21.
1) The hoist lever 111 is operated to the “raised” position or “lowered” position, and the vessel 110 is not seated. 2) The actual vehicle speed is lower than a predetermined set vehicle speed (for example, 10 km / h). (Step 204)
As a result, when both of the above conditions 1) and 2) are established (determination Y in step 204), the vessel 110 is not completely seated and is away from the soil removal point. It is determined that the state is (d), and the video of the camera 10 is displayed on the rear view monitor display unit 21 (step 205).

  On the other hand, if both of the above conditions 1) and 2) are not satisfied (determination N in step 204), the vessel 110 is completely seated after the vehicle 100 travels forward, or the vessel 110 is completely seated. Even if not, the vehicle is running at an actual vehicle speed higher than the set vehicle speed, and it is determined that it is no longer necessary to check the rear of the vehicle body, and the display of the rear view monitor display unit 21 is turned off. The video is not displayed (step 206).

  In the embodiment described above, it is determined whether the vessel 110 is not seated or seated by determining whether the hoist lever 111 has been operated to the “up” position or the “down” position. ing. However, instead of the hoist lever operation signal, a signal indicating the vessel position may be used to determine whether the vessel 110 is not seated or is seated.

  In this case, in step 203, based on the signal indicating the vessel position detected by the position sensor 112, the vessel 110 is not seated (decision Y in step 203), or the vessel 110 is seated (step 203). Determination N) will be determined.

  In step 204, it is determined whether or not the following conditions 1) and 2) are both satisfied.

1) The vessel position signal indicates a position where the vessel 110 is not seated. 2) The actual vehicle speed is lower than a preset vehicle speed (for example, 10 km / h). In step 204, the actual vehicle speed is predetermined. The vehicle speed is determined to be lower than the set vehicle speed (for example, 10 km / h), but the following 2 ′) or 2 ″) condition may be used instead.

2 ′) The actual speed stage is equal to or less than the D range start speed stage 2 ′, ′) The speed stage is within a predetermined time after the neutral position N is switched to the forward speed position F (D range), that is, the above 1) And the condition of 2 ′) or 2 ″) is satisfied and the current actual speed stage is equal to or lower than the D range start speed stage, or the current speed stage advances from the neutral position N. If it is within a predetermined time after switching to the speed position F (D range) (determination Y in step 204), an image of the camera 10 showing the field of view behind the vehicle body of the vehicle 100 is displayed on the rear view monitor display unit 12. (Step 205).

  On the other hand, when the above condition 1) is not satisfied, or when the condition 2 ′) or 2 ″) is not satisfied (determination Y in step 204), the rear view monitor display unit 12 The display is turned off, and the image of the camera 10 showing the field of view behind the vehicle body of the vehicle 100 is not displayed (step 206). For example, when the condition 2 ′) or 2 ″) is not satisfied and the current vehicle speed exceeds a predetermined value or the speed stage is switched from the neutral position N to the forward speed position F (D range), the predetermined speed is reached. When the time is exceeded, it is determined that the display is no longer necessary, and the display on the rear view monitor display unit 21 is turned off.

  As described above, according to the present embodiment, as long as the vessel 110 is not seated not only when the vehicle 100 is moving backward toward the soil removal point but also during or after the soil removal, the vehicle 100 is not seated. The rear view monitor display unit 21 in the cab 120 can be confirmed.

  In particular, when the earth removal area V is displayed superimposed on the captured image of the camera 10, the earth removal area V is confirmed on the rear view monitor display unit 21 in the cab 120 during or after earth removal. Therefore, it is possible to confirm whether or not the load has been securely received at the unloading place.

1, 2, 3, 4 points, 10 cameras, V earth removal area, 20 rear view monitor, 21 display unit, 23 CPU, 100 vehicle

Claims (3)

In the rear view display system of the transport vehicle that captures the view of the rear of the vehicle body by a camera attached to the rear of the vehicle body of the transport vehicle including the vessel, and displays the captured image on the display unit.
Using a signal for raising and lowering the vessel or a signal indicating the raising and lowering operation position of the vessel and a signal indicating a shift position, during a predetermined period after or after discharging the load of the vessel, Comprising display control means for displaying a photographed image of the camera on the display unit;
The display control means includes
A rear view display system for a transporting vehicle, characterized in that a captured image of the camera is displayed on the display unit on the condition that the signal indicating the shift position indicates a neutral position or a forward speed position. The signal is
A signal sent from a detecting means for detecting an operating position of a hoist lever for raising and lowering the vessel, a signal sent from a detecting means for detecting the raising and lowering position of the vessel, or a hoist cylinder for raising or lowering the vessel 2. The rear view display system for a transport vehicle according to claim 1, wherein the signal is one of signals sent from detection means for detecting the stroke position of the transport vehicle. The display control means includes
The signal indicating the shift position indicates the forward speed position, and the actual speed is equal to or lower than the set speed, or
On condition that the signal indicating the shift position is within a predetermined time after indicating that the neutral position is switched to the forward speed position,
The rear view display system for a transport vehicle according to claim 1, wherein a captured image of the camera is displayed on the display unit.

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