JP4310632B2 - Construction machine display device - Google Patents

Description

  The present invention relates to a display device for a construction machine that is installed in a cab of a construction machine such as a hydraulic excavator and allows an operator to recognize various types of information.

  There is a hydraulic excavator as an example of a construction machine. As is well known, a hydraulic excavator is configured such that a hydraulic pump is driven by an engine, and hydraulic oil output from the hydraulic pump is supplied to hydraulic actuators including hydraulic cylinders and hydraulic motors that are mounted on respective operating parts. . Each of these operating parts is usually carried by an operator in the cab and operated by operating means such as an operating lever to perform work such as excavation of earth and sand.

  Various kinds of instruments are mounted in the cab so that the operator can recognize the operating status of the machine. For example, there are an engine speed meter, a fuel meter, a coolant temperature meter, a hydraulic oil temperature meter, an hour meter, and the like. In addition, information related to the safe operation of the machine, for example, whether or not the gate lock lever is in a proper position is also displayed. Further, it is determined whether or not a starter key has been entered. Furthermore, the type of attachment attached to the front work machine is also recognized. A display device is provided to display such information, that is, vehicle status information.

As this display device, a liquid crystal display having a configuration in which a color image is collectively displayed on a monitor screen has been put into practical use as the liquid crystal display is improved in accuracy and price. By using this display device, various types of information can be displayed with a compact configuration, and the operator can accurately grasp the operating status of the machine. When an abnormal condition that significantly affects the operation of the machine occurs, for example, when there is a possibility that the engine will overheat, the abnormality detection means detects it and notifies the operator quickly and reliably. In order to achieve this, what is configured to be displayed on the screen is conventionally known as disclosed in, for example, Patent Document 1. That is, when there is no abnormality in the machine, the above-mentioned vehicle status information is displayed on the screen, and when a certain abnormality is detected by the abnormality detection means, a message is displayed indicating that an abnormal condition has occurred. The monitor is switched, so that the operator can avoid abnormal conditions, for example, when the engine is overheated, take appropriate measures such as turning the engine to idling, etc. Can be prevented in advance.
JP-A-11-81393

  In recent years, there has been a tendency for demands for work safety to increase, and reflecting the low prices of cameras (video cameras, digital cameras, etc.), the blind spots when operators operate machines. In particular, a camera is installed at the rear position of the vehicle, and an image from this camera is displayed so that the operator can not see the rear view, or the rear view is difficult to see. It has been developed and put into practical use.

  Here, the camera image is generally displayed on a monitor composed of a liquid crystal display or the like provided in the driver's cab. For this reason, in the driver's cab, the above-described vehicle status information display device is placed at a position that is easy for the operator to see. In addition, a monitor that displays external images must be installed. Since the operator in his / her work usually looks forward in front, these two monitors must be placed in front of the driver's seat. These monitors obstruct the front view and limit the operator's attention. There is a problem that may become distracted.

  From the above, one monitor is provided in the cab. There are various types of information that must be displayed on the monitor or that are desirably displayed. Although it is conceivable to divide the screen into a plurality of pieces and display different information for each display area, each display image becomes small and difficult to see. Therefore, a method of switching various types of information to a monitor for display must be employed. The display image is switched by an operator's operation. For this reason, as the number of types of display images increases, there is a problem that more time is required for switching and the operability of the machine becomes worse.

  Therefore, the problem to be solved by the present invention is that the frequency of manual switching of the screen by the operator can be selected by enabling selection of an image preferentially displayed on the monitor according to the situation or the like according to the operation status of the construction machine. It is to be able to reduce.

In order to achieve the above-described object, the means adopted by the present invention includes an engine, a hydraulic pump driven by the engine, and a plurality of operating parts driven by pressure oil supplied from the hydraulic pump, A sensor for detecting at least a remaining amount of fuel supplied to the engine, an engine cooling water temperature and a hydraulic oil temperature, an abnormality detecting means for detecting an abnormality in an operating state based on signals from these sensors, and a camera for monitoring the surroundings a construction machine provided, on the cab of the construction machine, before Symbol vehicle status information output from the sensor, the abnormality information detected by the acquired supplementary view image information by the camera, and the abnormality detecting means includes to these vehicle state information and the auxiliary view image information is installed selectively displayable monitor image information different from the one or more types, contact on the monitor Was the control device includes an image selecting unit that selects a display image, the image selection unit, idle mode and the start time of driving of the actuating portion at engine start is in a state before the work start stopping The plurality of images that can be displayed on the monitor as images that are preferentially displayed on the monitor in accordance with the operating state of the construction machine in the working mode that is the working state in which the engine rotational speed is increased or the operating unit is driven. It includes priority image setting means for selecting and displaying the vehicle status information or the auxiliary visual field image information from among the types of images , and a manual switching means is connected to the image selection section. The manual switching means can switch the display image on the monitor from the priority image to a desired image.

Here, as various kinds of image information displayed on the monitor, first, there is information relating to the vehicle operation status, that is, a vehicle status display image. Also, there are images acquired by the camera, whereby it is possible to viewing the operator can not visually recognized obtained auxiliary, i.e. viewing the auxiliary image is obtained. As this auxiliary visual field image, for example, a rear visual field or a lateral visual field that cannot be obtained when the operator is facing forward, a position for safety confirmation and a position that cannot be viewed from the inside of the cab, for example, deep drilling There is also a work area confirmation device for confirming the operating state of the front end portion of the front work machine when working at a high altitude. In addition, as image information other than these, it is temporarily included in the information related to the vehicle operating status, but when an abnormality occurs in the machine, in order to make the operator recognize the abnormal information without fail, In addition, in order to notify where and what kind of abnormality has occurred, it is desirable to display this abnormality information on a monitor as an abnormality information display image. Furthermore, in order to perform centralized management of construction machines, a management center is provided, and each construction machine is used to issue commands and give various information to each construction machine from this management center. It is also possible to connect the communication facility and related facilities such as a management center by communication means. In order to accurately transmit necessary commands and transmission information performed through the communication means to an operator operating the construction machine, there is also a so-called communication information display image that is displayed as a message on the monitor. Is preferable.

  The image information exemplified above is displayed on a single monitor, but depending on the work content and work status of the construction machine, there are those that require high display and those that do not, and it is necessary to display them. Some are not. However, the vehicle status display image and the auxiliary visual field image for safety confirmation can always be displayed. Then, considering the operating state of the construction machine, etc., the frequency of the image switching operation by the operator can be significantly reduced by setting in advance such that the information with the highest degree of demand is preferentially displayed on the monitor. Can do. However, if the preferentially displayed image is uniquely set, the switching frequency of the image may increase.

  The operation state after the construction machine is started is roughly divided into a work state in which work is actually performed and an idling state in which no special work is performed. Therefore, first, priority images can be selected during work and idling. Therefore, the priority image selection unit is configured to set a priority image at the time of work and a priority image at the time of idling. In these two states, different image information may be displayed, or the same image information can be selected. Although the image candidate displayed as the priority image is not particularly limited, at least the vehicle status display image constitutes image information selected as the priority image. In order to ensure the safe operation of the construction machine, it is desirable that the auxiliary visual field display image used for safety confirmation among the auxiliary visual field display images also constitute image information selected as the priority image.

  When abnormalities occur in various mechanisms that make up construction machinery, for example, when the battery charging voltage is below a specified value, when the engine oil pressure is below a specified value, the engine cooling water or hydraulic oil temperature is specified. If the temperature is higher than this, or if the filter provided on the intake side of the engine filter is clogged, etc., these abnormalities must be reported to the operator quickly and reliably, and various measures must be taken. This will damage the equipment. The occurrence of such an abnormality can be recognized or estimated by the operator from the vehicle status information, but it is desirable to notify the operator more reliably and quickly. The display of the abnormal information display image is indispensable from the viewpoint of preventing the failure of the construction machine. For example, when the vehicle status information is displayed, the display includes the occurrence of an abnormal state. It can also be. Further, this abnormal information display image is not displayed unless an abnormal state is detected, and when the abnormal information is displayed, it is desirable to stop the engine in principle. From this point, when an abnormal state occurs, Whatever the image displayed at that time, what is necessary is just to interrupt and display the abnormal information display image. Therefore, this abnormality information display image is not familiar with the selection target.

  For example, when the vehicle state display image is displayed in the working state, it is preferable to display an auxiliary visual field image for safety confirmation when the vehicle is moved backward or turned. Also, it may be desirable to display an auxiliary visual field image for confirming the work area, such as when performing a deep drilling operation. Furthermore, when communication information is received, it may be desirable to display it immediately. In consideration of the above points, detailed setting means that can basically select a detailed screen according to the operating state of the construction machine after setting a priority image that is preferentially displayed during and outside the work. If this is provided, the frequency of manual screen switching can be further reduced.

  Since the present invention is configured as described above, information that is most necessary for the operator is selectively displayed on the monitor, and it is possible to reduce the frequency of manual image switching during work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a display device for a hydraulic excavator will be described as a construction machine. However, the construction machine to which the display device is attached is not limited to this hydraulic excavator.

  First, FIG. 1 shows the overall configuration of the hydraulic excavator. In the figure, reference numeral 1 is a crawler type lower traveling body, 2 is an upper swing body, and 3 is a front work machine comprising excavation means provided on the upper swing body 2. In addition, a driver's cab (cab) 4 is installed on the upper swing body 2 so that an operator can board the machine and operate the machine. Operation means including an operation lever for performing operations such as operation of a boom 3a, an arm 3b, and a bucket 3c constituting the front work machine 3 for performing operations such as turning of the body 2 and excavation of earth and sand is provided.

  The hydraulic excavator is configured as described above. Normally, the hydraulic excavator is driven by a hydraulic drive system in which a hydraulic pump is operated by an engine to drive a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder. Accordingly, various sensors for detecting engine-related operating conditions and various sensors are also provided in each part of the hydraulic drive system, and sensors are also mounted in each operating part of the front work machine 3 and the like, so that each part of the hydraulic excavator Is monitoring. Among the detection information by these sensors, there are information that is preferably recognized by the operator, information that is essential to be recognized, and information that is not required to be notified to the operator. Further, the information that the operator needs to recognize is information related to the operation status of the vehicle, and among these, there is information that must be recognized urgently and reliably. That is, the information that needs to be notified to the operator includes general vehicle status information and abnormality information related to the occurrence of an abnormal state that may cause a serious failure in the hydraulic excavator.

  The hydraulic excavator is provided with a monitoring camera in order to assist an external visual field by the operator. Reference numeral 10 is attached to a counterweight 5 installed at a rear position of the upper swing body 2 in order to secure a rear visual field, and in order to confirm safety to an operator who operates the machine in the cab 4, the visual field is auxiliary. It is a camera to secure. Reference numeral 11 is attached to the vicinity of the tip of the arm 3b in the front work machine 3, and is provided for confirming the state of the deep digging position that the operator cannot look into from the cab 4, that is, the excavation state. . In addition, an auxiliary visual field is obtained when working at a high place with the camera 11. In addition, it is not essential to provide both of these cameras 10 and 11, and the cameras 10 and 11 may be appropriately provided according to the working mode performed by the hydraulic excavator, the situation at the work site, and the like. The camera 10 that acquires the rear visual field is necessary from the viewpoint of ensuring the safety of work. In addition to these positions, for example, a camera for acquiring an auxiliary visual field on the side can be installed.

  Furthermore, the excavator is equipped with a communication means, and this communication means enables wireless communication with related facilities such as a management center at a remote location. This makes it possible to centrally manage various construction machines including hydraulic excavators. For example, to grasp the work status at the work site, manage the distribution of consumables, and manage the schedule of construction machines. can do. For this purpose, at least a hydraulic excavator is provided with a communication device 12 (see FIG. 7) and its antenna 12a. The communication may be dedicated for reception on the hydraulic excavator side, or may be configured to allow bidirectional communication.

  As shown in FIG. 2, a monitor 13 composed of a liquid crystal display or the like is installed in the cab 4. By displaying various information on the monitor 13, an operator who operates the machine can see it. This information can be recognized. Therefore, the monitor 13 can be seen even while the operator is operating each mechanism constituting the hydraulic excavator. However, during work, it is necessary to prevent the front vision as much as possible. For this purpose, the monitor 13 has a relatively small screen, and is disposed obliquely in front of the driver's seat 6 in the cab 4, for example, attached to the pillar 7.

  Although the information displayed on the monitor 13 includes the information described above, it is not preferable to display these on the monitor 13 in terms of easiness to see. In view of this, the various types of information described above are grouped and a plurality of display screen modes are set, so that they can be switched and displayed as necessary. The images displayed on the display device include, for example, the four modes shown in FIGS.

  First, the display mode shown in FIG. 3 illustrates a vehicle status display image displayed as vehicle status information. As display information specifically shown in the figure, as an icon display, in order from the left side of the drawing, whether the anti-theft mechanism is operating A1, the tip of the arm 3b constituting the front working machine 3 A2 indicating whether the bucket 3c is mounted or other front attachment is mounted, an operating load status display A3, a traveling speed display A4, an auto idle display A5, and whether or not the illumination lamp is lit Display A6 and wiper operation presence / absence display A7, and along with these, there is an operation time display section B, and the operation time is displayed numerically. Further, in the lower stage, that is, a large area in the central portion of the monitor 13, the engine cooling water temperature display C1, the hydraulic oil temperature display C2, and the fuel remaining amount display C3 are arranged side by side for character display. Furthermore, there are display units D1 and D2 for the remaining battery level and the engine oil pressure at the bottom, but when the battery charge amount and the engine oil pressure are maintained at a certain level, the battery charge amount and the engine When the oil pressure falls below a predetermined level, the display state changes, such as a change in shade and a change in color tone.

  In addition, what is displayed as vehicle status information does not have to include all these information, and information other than these information can also be included. In short, the current state of the vehicle to be recognized by the operator may be displayed. However, aside from the display form, at least the engine coolant temperature display C1, the hydraulic oil temperature display C2, and the remaining fuel display C3 must be included.

  Next, FIG. 4 shows an example of an auxiliary visual field image for displaying a camera image. In the figure, for safety confirmation, an image obtained by the camera 10 that acquires the rear visual field is displayed, and a landscape image of the rear of the vehicle is displayed on the entire screen of the monitor 13. Further, when the video information from the camera 11 that acquires the video of the excavation state is displayed for checking the work area, the video information is displayed using the entire screen.

  Furthermore, FIG. 5 shows an example of the received information display image. The received information is basically a message display, and the message is a command or message transmitted from the related facility such as the management center. The message content may be of any type, such as work schedule, work place, etc., related to the machine. The message display location is a location where the character displays C1 to C3 of FIG. 3 are made, and a message is displayed instead of these character displays. In addition, when two-way communication is possible, the transmission content from the operator may be displayed on this part. When a message from the management center or the like is received, a mark is provided at an appropriate location on the monitor 13, for example, the lower right corner in FIG. Can be set to open or open windows.

  FIG. 6 shows an example of the abnormality information display image. An abnormal state is an occurrence of a situation that causes a failure or accident if the device continues to operate as it is. More specifically, when the battery charging voltage is below a specified value, engine oil The oil pressure of the engine is below the specified value, the engine coolant is above the specified temperature, the hydraulic oil temperature is abnormally high, the filter provided on the intake side of the engine filter is clogged, etc. . Although these situations can be recognized based on the vehicle status information, in view of the seriousness of the situation, in order to make the operator recognize the abnormal state quickly and reliably, the central portion of the screen of the monitor 13, That is, it is set as the location where character display C1-C3 of FIG. 3 is made | formed, and it replaces with these character displays, and the message display is made so that it may stand out in terms of character size, color, and the like. In addition, in consideration of safety, it is desirable that alarms be simultaneously generated for several seconds to several tens of seconds in addition to the message display on the monitor 13.

  The monitor 13 is controlled by the control device 20 shown in FIG. 7 so that the various images described above are displayed selectively and switchably. That is, the control device 20 is provided with an input control unit 21. The input control unit 21 receives a detection signal from a sensor provided in each unit, and also receives from the camera 10 (and the camera 11). A video signal is captured, and a reception signal input to the communication device 12 is also captured.

  A signal transmitted from the camera 10 is taken into the video signal processing unit 22 from the input control unit 21, and a video signal to be displayed on the monitor 13 is generated by the video signal processing unit 22. Stored in the image memory 23. Further, message information from the management center received by the communication device 12 is stored in the communication information memory 24. Furthermore, detection signals from various sensors are inputted to the control device 20 every moment, and these input signals are taken into the data processing circuit 25 to detect the current state of each part, and the vehicle Data necessary for displaying the situation information is created and taken into the character generation circuit 26 for forming a vehicle situation display image. When the input signal from any sensor changes, this change is detected by the data processing circuit 25 and reflected in the character generation circuit 26.

  Further, a data comparison unit 27 is connected to the data processing circuit 25, and the data comparison unit 27 determines an abnormal state among various data input to the data processing circuit 25 among various sensors. Therefore, the numerical data necessary for this purpose is selected and imported. The data comparison unit 27 holds numerical data serving as a reference for abnormality detection, and the current numerical value taken into the data comparison unit 27 from the data processing circuit 25 is compared with a set reference value. Whether or not an abnormal situation has occurred is determined. Therefore, the data comparison unit 27 constitutes an abnormality detection unit. When it is determined by the data comparison unit 27 that an abnormal situation has occurred, an appropriate message is generated by the message generation unit 28 that generates a message corresponding thereto.

  The control device 20 includes an output control unit 29, which includes a video signal from the image memory 23, a vehicle status signal from the character generation circuit 26, received information from the communication information memory 24, and an abnormality generated by the message generation unit 28. Any of the information is selectively displayed on the monitor 13 via the output control unit 29. As described above, in order to select an image to be displayed on the monitor 13, the image selection unit 30 is connected to the output control unit 29, and the image selected by the image selection unit 30 is output from the output control unit 29. Is displayed on the monitor 13. The operation of each part of the control unit 20 configured as described above is controlled by the CPU 31. Therefore, the CPU 31 and each of these parts are connected by a bus, and the operation procedure and the like are recorded in the CPU 31. And a RAM for executing various signal processing in accordance with the procedure recorded in the ROM.

  Here, a priority image setting unit 32 and a selection switch group 33 as its input means are connected to the image selection unit 30, and the priority image setting unit 32 is displayed on the screen of the monitor 13 according to the operating state of the machine. The type of image to be displayed with priority is set and registered. The selection switch group 33 is provided for the operator to select a priority image displayed on the monitor 13 by manual operation, and includes, for example, UP, DOWN, RIGHT, LEFT cursor movement buttons and a confirmation button. As shown in FIG. 8, the selection switch group 33 is provided in a region of a frame 13b formed around the screen 13a in the monitor 13, and an image changeover switch 34 as manual switching means is also provided in the frame. 13b.

  In the priority image setting unit 32, which of the various images illustrated in FIG. 3 to FIG. 6 is displayed, and the image to be displayed is automatically switched according to changes in the operating state, etc. As automatic switching, a program is set to switch from which image to which image in what state. Accordingly, when the hydraulic excavator is operated, a priority image corresponding to the program set in the priority image setting unit 32 is automatically displayed on the monitor 13.

  Basically, an image that is preferentially displayed when the operation state of the hydraulic excavator as a construction machine is operating in the work mode, and an image that is preferentially displayed when the idle state is in the idling mode. Is set in the priority image setting unit 32. Here, the work mode is a state in which each part constituting the hydraulic excavator is operated, that is, the front work machine 3 is driven, the lower traveling body 1 travels, the upper revolving body 2 rotates, and so on. In addition, the idling state is a state in which the operation of each part is stopped for a break, standby or the like. These two states can be detected by the rotational speed of the engine, the position of the gate lock lever, and the like. That is, the hydraulic excavator is in the idling mode when the engine speed is below a certain level or when the gate lock lever is raised and locked. On the other hand, when the engine is in a high rotation state or the gate lock lever is lowered and is in the unlocked state, the hydraulic excavator is in the working mode. Accordingly, the priority image setting unit 32 can set images to be preferentially displayed in the engine speed or the position of the gate lock lever, and also in the working mode and idling mode detected by other than these. Yes.

  Here, the preferentially displayed images are a vehicle status display image and an auxiliary visual field image, and in particular, an image for safety confirmation for monitoring the rear of the vehicle among the auxiliary visual field images. When the hydraulic excavator continuously operates under severe conditions, the temperature of the engine cooling water and hydraulic oil becomes high, so the operator always displays the vehicle status display image, particularly the engine cooling water temperature display C1 and the hydraulic oil temperature. It is necessary to visually check an indicator such as display C2. On the other hand, it is extremely important to obtain a rear view when there is a lot of traffic and workers are in the vicinity, or when operating at a position close to the structure.

  Therefore, by operating the selection switch group 33, it is possible to select images preferentially displayed on the screen 13a of the monitor 13 in the idling mode and the work mode, respectively. The selection of the priority image is set in accordance with the work situation. For example, when the machine operates under severe conditions, the vehicle state display image is selected in the work mode, and the assist image is selected in the idling mode. A field of view image can be selected to be displayed. As a result, it can be confirmed that there are no obstacles or people in the vicinity until immediately before the work is actually started, and the temperature of the engine coolant, the hydraulic oil, etc. can be constantly checked when the work is started. In addition, when the machine is operating in an urban area, etc., the operation of the machine itself is not so severe, but there is a possibility that structures, vehicles, people, etc. may exist around the machine within the range of movement. Then, in order to minimize the area that becomes a blind spot for the operator, it is desirable to select to display the auxiliary visual field image preferentially in the work mode and to preferentially display the vehicle status display screen in the idling mode. Note that the same image can be set to be displayed preferentially in the idling mode and the work mode.

  As described above, the most appropriate image is always displayed on the monitor 13 by operating the selection switch group 33 in advance and selecting the optimum image in each mode according to the operating conditions of the machine. Therefore, the frequency of manual image switching can be reduced. In addition, a desired image can be displayed by operating the screen changeover switch 34. Here, in FIG. 7, the engine speed meter is taken into the image selection unit 30, and it is detected by this engine speed meter whether the excavator is in the working mode or the idling mode. Like to do.

  As described above, selecting either the vehicle status display image or the auxiliary visual field image in the idling mode and the work mode is a basic selection, but depending on the movement of each part of the machine, etc. Further, so-called detailed setting for selecting an image to be displayed can be performed. Here, for example, even if the vehicle situation display image is preferentially displayed, the detailed setting is switched from the vehicle situation display screen to the auxiliary visual field image while the reverse operation lever is operated. When the camera is mounted not only on the rear position of the counterweight but also on the left and right sides, or when the camera is mounted on the front work machine 3 or the like, the operator moves the vehicle backward or turns right. When the operation means such as the control lever is operated to turn left or deepen, the camera 13 is set to display the related camera image on the monitor 13 in conjunction with it. When there is communication from the center, etc., the message is set to be displayed for a predetermined time immediately or when the work mode is switched to the idling mode. And it can also be.

  On the other hand, the abnormal information display image is not displayed unless an abnormal state occurs. Moreover, if an abnormal state occurs, the operator must be made to recognize it as quickly and reliably as possible. Therefore, no matter what image is displayed on the monitor 13, if an abnormal state occurs, it is set to automatically switch to the abnormal information display image immediately. For example, as for the temperature of the engine cooling water, the temperature of the engine cooling water is always detected by a temperature sensor, and when the temperature-related data is input to the data processing circuit 25 and the temperature changes, FIG. This is reflected in the engine coolant temperature display C1 shown in FIG. At the same time, the data relating to the temperature is taken into the data comparison unit 27. In the data comparison unit 27, the maximum temperature of the engine coolant is set as a reference value. When the measured value of the engine coolant temperature obtained by the data processing circuit 25 exceeds this reference value, the output control unit 29 is used. The abnormality information shown in FIG. 6 is displayed. That is, the output of the data comparison unit 27 becomes a trigger, and the monitor 13 is immediately and automatically switched from the camera image display screen to the abnormal state display screen.

  Thus, regarding the type of image displayed preferentially for each operation mode, detailed settings for automatically switching the display image according to the operating status of the hydraulic excavator, and items displayed as abnormality information, etc. Can be set by connecting a personal computer or the like as an input means to the control device 20. The personal computer or the like can also be used to set priority images and detailed settings.

  Now, the selection switch group 33 preferentially displays the vehicle situation table image on the monitor 13 in the work mode, and preferentially displays the rear visual field image obtained from the camera 10 among the auxiliary visual field images in the idling mode. In addition, when the front work machine 3 is in a deep position as a detailed setting, a setting is made so that a priority display of the work area confirmation image obtained from the camera 11 is performed among the auxiliary visual field images. Suppose that

  In this state, when the hydraulic excavator is activated by the starter key, that is, when the engine is driven, display on the monitor 13 is started. Here, at the time of start-up, the engine is idling and the engine speed is low. Therefore, a signal from the engine speed meter is taken into the image selection unit 30. Therefore, among the priority images set and registered in the priority image setting unit 32, the rear visual field image which is the priority image in the idling mode is read out, and the rear visual field image shown in FIG. Will be displayed. Since it is important to check that there are no obstacles around the vehicle and that no workers have entered, it is important to check before starting work, so the operator looks back while sitting on the driver's seat 6. You can check the safety of the surroundings without having to.

  After confirming the safety in this way, the engine speed is increased and the operation mode is entered. However, since the change in the engine speed is taken into the control device 20, the operation is started from the priority image in the idling mode. The vehicle status display image of FIG. 3, which is the priority image in the mode, is automatically switched to the state displayed on the monitor 13. Therefore, the work can be performed while checking the state of each operating part. And while this vehicle status display image is displayed, for example, when trying to reverse the vehicle, it is also necessary to confirm the safety behind, so by pressing the image changeover switch 34, The monitor 13 switches to a rear view image. And if it becomes unnecessary to obtain a back visual field, it will return to the vehicle condition display image which is a priority image. The restoration to the priority image may be performed by the operation of the image changeover switch 34. For example, when the reverse operation lever returns to the neutral position, the restoration to the priority image is performed in conjunction therewith. It can also be. Further, the images that can be manually selected by the image changeover switch 34 are not limited to those described above. For example, when the communication information image shown in FIG. 5 is to be viewed, the image changeover switch 34 may be operated.

  During the operation of the hydraulic excavator, for example, when the engine coolant reaches or exceeds the temperature set as the upper limit, the monitor 13 automatically switches from the priority image, and the abnormal state display image of FIG. 6 is displayed. . In this case, it is necessary to take measures to eliminate the abnormal state. If the engine coolant temperature exceeds the upper limit temperature, the operation is interrupted and the abnormal state is resolved by reducing the engine speed. To do. The display of this abnormal state continues until the abnormality is resolved. Therefore, since the engine speed is decreasing, when the abnormal state is resolved and the screen is switched, it is in the idling mode, so the next automatically switched image is the rear view image. Therefore, it becomes possible to perform a safety check before starting work after the abnormal state is resolved, and when the engine speed is increased again and the work is started, the vehicle status display image that is the priority image at that time is displayed. Switch.

  Further, as a detailed setting, during deep drilling, the work area confirmation image at the excavation position is set as a priority display image. Therefore, when the front work machine 3 is in the deep drilling state, the vehicle status display image It automatically switches to a state in which video from the camera 11 is displayed. Therefore, it becomes possible to accurately grasp the state of the excavation position that cannot be seen by the operator in the cab 6 in a normal state, and the work can be performed efficiently. Further, when the front work machine 3 moves and rises from the deep position, the monitor 13 switches to a state in which a vehicle status display image is displayed.

  As described above, since the most desirable display content is displayed on the single monitor 13 in accordance with the work situation, the machine can be operated safely and efficiently. Since the frequency of image switching that must be performed manually by the operator can be significantly reduced, efficient and safe work can be ensured from this point of view, and the burden on the operator does not increase.

It is a schematic block diagram of the hydraulic shovel as an example of a construction machine. It is a principal part block diagram inside the cab of the hydraulic shovel of FIG. It is a figure which shows an example of the vehicle condition display screen in a display apparatus. It is a figure which shows an example of the back visual field image display screen in a display apparatus. It is a figure which shows an example of the communication information display screen in a display apparatus. It is a figure which shows an example of the abnormal condition display screen in a display apparatus. It is a block diagram of a control apparatus. It is a schematic block diagram of a display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 3 Front work machine 4 Driver's cab 10, 11 Camera 12 Communication apparatus 13 Display apparatus 20 Control apparatus 32 Priority image setting part 33 Selection switch group 34 Screen change switch

Claims (5)

An engine, a hydraulic pump driven by the engine, and a plurality of operating parts driven by pressure oil supplied from the hydraulic pump, at least a remaining amount of fuel supplied to the engine, an engine cooling water temperature, and an operation In a construction machine provided with a sensor for detecting an oil temperature, an abnormality detection means for detecting an abnormality in an operating state based on signals from each of these sensors, and a camera for monitoring the surroundings,
Wherein the cab of the construction machine, before Symbol vehicle status information outputted from the sensors includes an abnormality information detected by the auxiliary view image information and the abnormality detecting means is acquired by the camera, and their vehicle status information auxiliary field A monitor capable of selectively displaying one or more types of image information different from the image information is installed,
The control device connected to the monitor includes an image selection unit that selects a display image.
This image selection unit is an idling mode that is a state before the start of work in which driving of the operation unit is stopped at the time of starting the engine, and an increase in the engine speed from the time of starting or a work state in which the operation unit is driven. The vehicle status information or the auxiliary visual field image information is selected from the plurality of types of images that can be displayed on the monitor as images that are preferentially displayed on the monitor in accordance with the operating state of the construction machine in the work mode. Priority image setting means for selecting and displaying ,
Further, manual switching means is connected to the image selection section, and the manual switching means can switch the display image of the monitor from the priority image to a desired image. Display device. The configuration is such that when abnormality information is output from the abnormality detecting means, the display of the monitor is switched so as to display the abnormality information image from the priority image selected by the image selection unit. The display device for a construction machine according to 1. The construction machine is further provided with communication means for receiving a message from a related facility, and the manual switching means can display the communication information message received by the communication means from the vehicle status information or camera image information. 3. The display device for a construction machine according to claim 1, wherein the display device is a construction machine. The priority image setting means can set different priority images or the same priority image when the construction machine is operating in the working mode and when the construction machine is operating in the idling mode. 2. The display device for a construction machine according to claim 1, wherein the display device is configured as described above. 5. The display device for a construction machine according to claim 4, wherein the priority image setting means is further configured to be able to set an image to be preferentially displayed according to an operating state of each part constituting the construction machine.

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