CN1603528A - Display device for construction machinery - Google Patents

Abstract

A camera picture signal provided from a camera 10, communication information provided from a communication device 12, and vehicle state information provided from various sensors, are inputted to a control device 20 of a hydraulic excavator. Abnormal information likely to cause failure of a vehicle, is acquired when exceeding a reference value in a comparing part 27 among signals from the sensors. When the abnormal information is outputted from the comparing part 27, the abnormal information is automatically displayed on a monitor 13.

Description

Display device for construction machinery

technical field

The present invention relates to a display device for a construction machine installed in a cab of a construction machine such as a hydraulic excavator to let an operator know various information.

Background technique

An example of a construction machine is a hydraulic excavator. As is well known, a hydraulic excavator drives a hydraulic pump by an engine, and supplies pressure oil output from the hydraulic pump to a hydraulic actuator including a hydraulic cylinder and a hydraulic motor mounted on each operating part. In addition, usually, an operator is boarded in a cab, and the operator operates each of these actuating parts through an operating mechanism such as an operating lever to perform operations such as excavation of earth and sand.

In order to let the operator understand the working condition of the machine, various instruments are installed in the cab. For example, engine tachometer, fuel gauge, cooling water temperature gauge, working oil temperature gauge, hour meter, etc. In addition, information about the safe operation of the machine is also carried out, such as the display of whether the door lock lever is in the normal position, etc. In addition, it is also determined whether the starter key is inserted or not. In addition, identification of the type of attachment attached to the front working machine, etc. are also performed. Furthermore, a display device is provided for displaying this information, that is, vehicle status information.

As such a display device, a display device that collectively displays a color image on a monitor screen using a liquid crystal display has been put into practical use along with the improvement in precision and price reduction of liquid crystal displays. By using this display device, a variety of information can be displayed with a compact structure, and the operator can accurately grasp the working condition of the machine. In addition, in order to allow the operator to quickly and surely understand the situation, in order to detect it by the abnormality detection device when an abnormality that greatly affects the operation of the machine occurs, such as when there is a possibility of engine overheating, etc., A configuration for displaying on a monitor screen is disclosed in, for example, Patent Document 1 or the like. That is, when there is no abnormality in the machine, the above-mentioned vehicle condition information is displayed on the monitoring screen, and when a certain abnormality is detected by the abnormality detection device, the monitor is switched to a state in which the abnormal state has occurred with information, so that The operator avoids an abnormal state, such as when the engine becomes overheated, and takes appropriate measures such as idling the engine to prevent the occurrence of mechanical failure in advance.

(Patent Document 1) Japanese Patent Application Laid-Open No. 11-81393

Contents of the invention

In recent years, there is a tendency to increase the safety requirements for work. In addition, reflecting the price reduction of video cameras (video cameras, digital cameras, etc.), when the operator performs mechanical operations, the camera is installed at a position that becomes a blind spot. In particular, the image from the camera is displayed at the rear position of the vehicle. In this way, a display device that ensures the operator's rear view and the like has been developed and put into practical use.

Here, the camera image is generally displayed on a display device such as a liquid crystal display installed in the cab. For this reason, in the cab, the display device for external image display and the display device for displaying the above-mentioned vehicle status information must be installed in the driver's cab. Easily visible to the operator. In principle, the operator's field of vision is directed forward during operation, so the two display devices need to be placed in front of the driver's seat. These display devices become obstacles, restricting the forward field of vision, and there is a possibility that the operator may not be able to concentrate sex.

However, the above-mentioned vehicle condition information is not necessarily always displayed during mechanical operation, and abnormality information requires urgency, and if an abnormality occurs, it must be displayed promptly. Of course, when the machine works normally, no abnormal information is displayed. On the other hand, regarding the assurance of the operator's field of vision, the front and side of the machine can be visually ensured, and the parts that become blind spots are mainly the rear and oblique rear. When it is necessary to check the rear and oblique rear, it is when turning and retreating, and when carrying out normal excavation work and moving the vehicle forward, field of view assistance by the camera is not necessarily required.

In addition, for the centralized management of construction machines, a management center is installed, and in order to issue commands and provide various information to each construction machine from the management center, each construction machine and related facilities between the management center can also be connected by a communication device. In addition, in order to accurately convey the necessary commands and transmission information to be carried out through the communication device to the operator who operates the construction machine, it is preferable to display the message as a message on the display device.

The present invention was made in view of the above points, and its purpose is to suppress as much as possible the problem that the operator's field of vision is restricted in the cab, so that the operator can reliably understand the various aspects required for the smooth and efficient operation of the machine at an appropriate time. kind of information.

In order to achieve the above objects, the present invention provides a display device for a construction machine having an engine, a hydraulic pump driven by the engine, and a plurality of actuating parts driven by pressure oil supplied from the hydraulic pump, provided with at least A sensor that detects the remaining amount of fuel supplied to the above-mentioned engine, engine cooling water temperature and operating oil temperature, an abnormality detection device that detects an abnormality in the operating state based on the signals of these sensors, and a camera that monitors the surroundings; it is characterized in that: A monitor that can selectively display vehicle condition information output from at least one of the sensors, abnormality information output from the abnormality detection device, and camera image information output from the camera is installed in the cab of the machine; A control device is connected to the monitor, and the control device includes a manual switching device and an automatic switching device; the manual switching device switches to display any one of the above-mentioned vehicle condition information and camera image information; the automatic switching device is at least from When the above-mentioned abnormality detection device outputs the abnormality information, it automatically switches so that the abnormality information is displayed.

In addition, with the development of communication networks in recent years, equipment equipped with communication devices in construction machines has also been put into practical use in order to transmit various commands and information such as work plans and the like to construction machines from related facilities such as management centers. Therefore, it is preferable that information transmitted by the communication means, that is, communication information, can also be displayed on the monitor.

The monitor installed in the cab is arranged in the cab at a position in front of the driver's seat where the operator sits. It is installed obliquely in front of the driver's seat, preferably on a column, so that the front view is not hindered. At least 3 types of information are displayed on the monitor, and 4 types of information are displayed if communication information is included. As the display format, there are icon format, message format, graphic format, etc., although the video captured by the camera is not essential, but it is preferable to display it in a moving image state. As described above, the information that can be displayed on the monitor includes at least four types of information including vehicle condition information, abnormality information, camera image information, and reception information. In addition, when the camera is installed not only at the rear position but also at multiple locations including excavation equipment, any one of these camera image information can be selected by the manual switching device, and can also be displayed on the monitor in 2 screens.

Among the information composed of the above four types, the information that the operator must understand and requires urgency is abnormal information, and when the abnormal information is detected by the abnormal detection device, the abnormal information is automatically displayed on the monitor. Here, as abnormal information, there are cases where the charging voltage of the battery is below a predetermined value, when the oil pressure of the engine oil is below a predetermined value, when the temperature of the engine cooling water or working oil is above a predetermined temperature, and when the When the mesh of the filter on the intake side of the filter is clogged, etc. These abnormality information are set in advance, and the output signals from the sensors provided in each part are taken into the abnormality detection device, and the output values from the sensors are compared with the set values to detect abnormalities. The abnormality information includes not only information that is initially set as necessary information and cannot be changed, but also variable abnormality information that can be arbitrarily added or changed on the user side. In addition, as the display form of the abnormality information, the screen may be completely switched, and the message may be superimposed and displayed on the original screen in a superimposed form. However, exception information must be displayed prominently. In addition, in order for the operator to know the abnormal state more reliably, an alarm sound may be generated.

Abnormal information is only displayed when an abnormal state occurs, and other information is displayed on the monitor when no abnormal state occurs. Among other information, information about the condition of the vehicle is obtained from time to time while the vehicle is in operation. On the other hand, it is not necessary to obtain camera images during normal excavation work. In addition, it is not necessary to operate the camera all the time. For example, a camera for obtaining a rear view is necessary especially when the vehicle is moving backward or rotating. , it may be set so that the camera will not take pictures unless these conditions are met. In view of the above situation, it is possible to set the information displayed at all times so that the vehicle status information is displayed when the machine is started.

On the other hand, when an abnormal state occurs, it is immediately displayed on the monitor, so it is not always necessary to monitor the normal vehicle condition. On the other hand, the confirmation of the rear view is not necessarily necessary during normal excavation work, but it is extremely important for the operator to grasp the situation around the machine from the viewpoint of work safety and the like. From this point of view, it can also be arranged to display the photographed image on the monitor at all times, and operate the switching device according to the needs of the operator to display vehicle status information or receive information. In addition, when the vehicle status information (or the vehicle status information and received information) is displayed on the monitor, although it is necessary to ensure the rear view originally, it is conceivable that the operation is performed without switching the displayed content. For this reason, it is set to switch between the reverse operation device and the rotation operation device of the construction machine so that the camera image information is displayed on the monitor in the state where the rear view must be obtained, in order to ensure the safety of the work, etc. more ideal.

Since the present invention is constituted as above, only a single monitor is installed in the operator's cab, and the operator can properly obtain necessary information, so that the operability of the construction machine is improved, and at the same time, safe operation, etc. can be obtained. Effect.

Description of drawings

FIG. 1 is a schematic configuration diagram of a hydraulic excavator as an example of a construction machine.

Fig. 2 is a configuration diagram of main parts inside a cab of the hydraulic excavator shown in Fig. 1 .

FIG. 3 is a diagram showing an example of a vehicle status display screen of a monitor.

FIG. 4 is a diagram showing an example of a camera video display screen of a monitor.

FIG. 5 is a diagram showing an example of a communication information display screen of a monitor.

FIG. 6 is a diagram showing an example of an abnormal state display screen of a monitor.

Fig. 7 is a block diagram of a control device.

Fig. 8 is an explanatory diagram showing a switching state of a monitoring screen according to the first embodiment of the present invention.

Fig. 9 is an explanatory diagram showing a switching state of a monitoring screen according to a second embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows the overall configuration of a hydraulic excavator as an example of a construction machine. In this figure, reference numeral 1 is a crawler-type lower traveling body, reference numeral 2 is an upper revolving body, and reference numeral 3 is a front working machine constituted by an excavation work device and the like provided on the upper revolving body 2 . In addition, on the upper revolving body 2, an operator's cab 4 for carrying out mechanical operations is provided, and an operating device is provided in the cab 4. Rotation constitutes an operation lever used for operations such as operation of the boom 3a, the arm 3b, and the bucket 3c of the front working machine 3, such as excavation of earth and sand.

A hydraulic excavator is roughly configured as described above, and its drive is usually a hydraulic drive type in which an engine activates a hydraulic pump and drives hydraulic actuators such as hydraulic motors and hydraulic cylinders. Therefore, various sensors are installed to detect the operating conditions related to the engine, and various sensors are also installed in each part of the hydraulic drive system. In addition, sensors are also installed in each operating part of the front work machine 3 to monitor each part of the hydraulic excavator. . The detection information obtained by each of these sensors includes information that is preferably known to the operator, information that must be known, and information that may not be notified to the operator. In addition, the information that the operator needs to know is the information on the working condition of the vehicle, and there is also information that is urgent and must be known with certainty. That is, the information that needs to be notified to the operator includes general vehicle condition information and abnormality information about the occurrence of an abnormal state that may cause a serious failure of the hydraulic excavator or the like.

In addition, a monitoring camera is installed in this hydraulic excavator. Reference numeral 10 is a camera of the counterweight 5 installed at the rear of the upper revolving body 2 for ensuring the rear view. In addition, reference numeral 11 is a camera installed near the front end of the arm 3 b of the front working machine 3 for checking the state of the deep digging position that the operator cannot see from the cab 4 , that is, the digging state. It is not necessary to install both of these cameras 10, 11, and they can be appropriately installed according to the working state of the hydraulic excavator and the conditions of the work site, etc., but the camera 10 that obtains the rear view among the two cameras 10, 11 can ensure the safety of the work. Safety and other considerations are necessary. In addition, cameras may also be installed in positions other than these positions.

In addition, a communication device is mounted on the hydraulic excavator, and the communication device can perform wireless communication with related facilities such as a remote management center. In this way, various construction machines including hydraulic excavators can be collectively managed, for example, it is possible to grasp the work status at the work site, manage distribution of consumables, etc., or perform planning management of construction machines. 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 to reception on the hydraulic excavator side, or may be configured to allow two-way communication.

In the cab 4, as shown in FIG. 2, a monitor 13 is provided, and various information is displayed on the monitor 13, so that the operator who operates the machine can know the information. Therefore, it is necessary for the operator to be able to see the monitor 13 even while the machine is being operated, and to not obstruct the front view as much as possible during the work. For this reason, the monitor 13 has a relatively small screen, is arranged obliquely in front of the driver's seat 6 in the cab 4 , and is attached to the column 7 , for example.

The information displayed on the monitor 13 includes the above-mentioned information, but it is not preferable to display all of them on the monitor 13 in terms of visibility and the like. Therefore, the above-mentioned various information is divided into groups, a plurality of display screen states are set, and the display can be switched as necessary. The display screen includes four states shown in FIGS. 3 to 6 .

First, the display state shown in FIG. 3 exemplifies the content displayed as vehicle status information. However, the content displayed as the vehicle condition information does not necessarily include all of them, and information other than these information may be included. In short, it is only necessary to display the current state of the vehicle that the operator should know.

The display information specifically shown in the figure, as an icon display, from the left side of the drawing, there is a display A1 indicating whether the anti-theft mechanism is working, whether a bucket 3c is installed at the front end of the arm 3b constituting the front working machine 3, or whether it is The display A2 of other front attachments installed, the status display of the workload A3, the display of the walking speed A4, the display of whether the automatic idling is A5, the display of whether the lights are on or not A6, and the operation of the wiper. There is no display A7, and an operation time display part B is arranged side by side with it, and the operation time is displayed numerically. In addition, in a large area at the center of the monitor 13 at the lower stage, engine coolant temperature indication C1, hydraulic oil temperature indication C2, and fuel remaining amount indication C3 are displayed side by side in characters. In addition, there are display units D1 and D2 for the remaining battery level and engine oil pressure at the lowest stage. When the charge level of the battery and the oil pressure of the engine oil are maintained at a certain level, the ratio of the charge level of the battery and the oil pressure of the engine oil to a predetermined level When it is low, the display state changes due to changes in shading or color tone.

FIG. 4 shows the state of camera image display. This figure shows the display of the image obtained by the camera 10 for rear monitoring. Only the rear scenery image is displayed on the entire screen of the monitor 13, and other information is not displayed on the screen in principle. In addition, when displaying the image information from the camera 11 which acquired the image of the excavation state, the whole screen is also used for display.

In addition, FIG. 5 shows a screen displaying a state of receiving information. This received information is basically a display using a message indicating a command and a message transmitted from a related facility such as a management center. The contents of the message include machine-related information such as a work plan and a work place, regardless of the type. The message display locations are the locations of pattern displays C1 to C3 in FIG. 3 , and messages are displayed instead of these pattern displays. In addition, when two-way communication is possible, the contents of the transmission from the operator may be displayed at this location. When receiving a message from the management center, etc., in order to let the operator understand this state, a mark is set on an appropriate part of the monitor 13, such as the lower right corner of FIG. 3, the mark is flashed, or a window is opened.

FIG. 6 shows a state where abnormality information is displayed. An abnormal state is the occurrence of a situation that will cause a failure or an accident if the operation continues in this state. As a specific state, there are cases where the charging voltage of the battery is below a specified value, and the oil pressure of the engine oil is below a specified value. , when the engine cooling water is above the specified temperature, when the temperature of the working oil rises abnormally, and when the mesh of the filter provided on the intake side of the engine filter is clogged, etc. There are many occasions where these situations can be detected based on vehicle status information, but in view of the seriousness of the situation, in order to make the operator understand the abnormal state reliably and quickly, the pattern display C1-C3 in FIG. 3 is displayed in the center of the screen of the monitor 13 In place of these patterns, the message is conspicuously displayed in terms of character size and color, etc. Furthermore, in consideration of safety, it is preferable to issue an alarm simultaneously for several to tens of seconds in addition to the message display on the monitor 13 . Here, as the abnormality information, there are information that must be displayed due to its nature, and information that should be displayed as abnormality information in consideration of the structure of the machine and the state of the work. That is, as abnormality information, there are necessary information that cannot be changed after the initial setting, and information that is not necessarily such. Therefore, in addition to the necessary abnormality information that cannot be changed, there may be variable information that can be appropriately set or canceled as an abnormal state on the user side. For example, the charging voltage of the battery falls below the set value, and the engine cooling water temperature rises abnormally, etc., which cannot be changed.

FIG. 7 shows a block diagram configuration of a control device that controls the display of the monitor 13 . The control device 20 is provided with an input control unit 21, and the input control unit 21 takes in signals from sensors provided in each part, and also takes in video signals from the camera 10 (and the camera 11), and also takes in input signals. Receive signal to communication device 12 .

A signal sent from the camera 10 is generated by the video signal processing unit 22 to be displayed on the monitor 13 and stored in the video memory 23 . In addition, messages received by the communication device 12 from the management center and the like are stored in the communication information memory 24 . In addition, various sensors are input to the control device 20 every moment, and these input signals are taken into the signal processing circuit 25 to detect the current state of each part and write the data necessary for displaying vehicle status information into the memory 26 . When the input signal from any sensor changes, the change is detected by the signal processing circuit 25 and reflected in the memory 26 .

In addition, a comparator 27 is connected to the signal processing circuit 25, and among various sensors and various data input to the signal processing circuit 25, numerical data required for judging an abnormal state is selectively taken into the comparator. Section 27. Numerical data used as a reference for abnormality detection is held in the comparison unit 27 , and the current numerical value taken into the comparison unit 27 from the signal processing circuit 25 is compared with a set reference value to determine whether an abnormal situation has occurred. Therefore, the comparison unit 27 constitutes an abnormality detection device.

The control device 20 has an output control unit 28, through which the video signal from the image memory 23, the vehicle condition signal from the memory 26, the received information from the communication information memory 24, and the data received by the comparison unit 28 are selectively displayed on the monitor 13. Any one of 27 detected abnormal information.

The operation of each part constituting the above-mentioned control device 20 is controlled by the CPU 29. Therefore, the CPU 29 and the above-mentioned parts are connected by a bus. In addition, the CPU 29 has a ROM for recording operation programs and the like and is used to perform various tasks according to the programs recorded in the ROM. A RAM for signal processing. In addition, the CPU 29 starts operating in conjunction with the starter key 30 . Therefore, when the starter key 30 is turned on, the control device 20 enters an operating state, and a predetermined information is displayed on the monitor 13 . In addition, one or more switches 31 are provided on the edge of the monitor 13 (or around the driver's seat 6 ), and the state of the display screen of the monitor 13 is changed by operating the switches 31 .

The present invention is constituted as above, and two embodiments will be described below regarding the state of the screen displayed on the monitor 13 according to the situation.

(Example 1)

FIG. 8 shows one state of the screen display on the monitor 13 of the control device 20 . In the embodiment shown in FIG. 8 , camera image information, in particular, images captured by the camera 10 for obtaining a rear view are first displayed on the monitor 13 . That is, when the starter key 30 is turned on, a signal thereof is taken into the CPU 29, the control device 20 becomes an active state, and shooting by the camera 10 is started. The surrounding video obtained by the camera 10 is input to the video signal processing unit 22 from the input control unit 21 of the control device 20, and predetermined image processing is performed, and stored in the image memory 23, and the camera video is output to the The monitor 13 displays the camera image shown in FIG. 4 on the monitor 13 .

As a result, the operator who operates the hydraulic excavator can know the state of the rear through the display of the monitor 13 . The operator's forward field of view can be confirmed with the naked eye, and the rear field of view that cannot be obtained in a normal posture can be confirmed by looking at the monitor 13, so the situation of the hydraulic excavator can be grasped substantially all around. Therefore, the operator can safely and sequentially operate the hydraulic excavator.

Although the image from the camera 10 is displayed on the monitor 13, the signals of the sensors provided in each part are also taken into the control device 20, and the data related to the vehicle condition information shown in FIG. 3 is generated and processed by the signal processing circuit 25. change. In addition, among the numerical data input to the signal processing circuit 25 , data necessary for abnormality detection is taken into the comparison unit 27 and compared with the numerical data used as a reference. For example, regarding the temperature of the engine cooling water, the temperature of the engine cooling water is constantly detected by the temperature sensor, and the data on the temperature is input to the signal processing circuit 25. When the temperature changes, it is reflected in the engine cooling water temperature display C1 shown in FIG. 3 . Then, the data on the temperature is taken into the comparison unit 27 . The maximum temperature of the engine cooling water is set as a reference value in the comparison part 27, and when the measured value of the engine cooling water temperature obtained by the signal processing circuit 25 exceeds the reference value, the abnormal information shown in FIG. 6 is displayed through the output control part 28. . In other words, the output of the comparison unit 27 is a trigger to instantly and automatically switch from the camera image display screen to the abnormal state display screen on the monitor 13 .

That is, as can be seen from FIG. 6 , the message "overheating occurs" is displayed. At the same time, regarding a method for resolving the abnormal state, for example, a suggestion such as "please put the engine in an idle state" is also displayed. By idling the engine (or stopping the engine) in this way, the overload state of the engine can be eliminated and the temperature of the cooling water can be lowered. When the temperature of the engine cooling water is lower than the set reference value, it becomes a trigger, and the abnormal state display screen is automatically switched to the camera image display screen. In this way, situations such as engine overheating and failure can be reliably avoided.

In addition, if the temperature of the working oil rises abnormally, its viscosity will drop, and there is a risk of seal leakage of the hydraulic circuit. Similar to the above, the monitor 13 automatically switches from the camera image display screen to the abnormal state display screen. Of course, the message displayed at the time of abnormality is used to let the operator know that the working oil temperature has risen. Moreover, even when another abnormal state occurs, the screen of the monitor 13 can be switched automatically by the same procedure using the output signal from the comparison part 27 as a trigger.

When an abnormal state has occurred, the abnormal state may or may not be eliminated by an operator performing some kind of operation. Where an abnormal state can be eliminated, a message can be used to display advice on its elimination procedure. On the other hand, there are abnormal conditions that cannot be eliminated by the operator in the cab 4, such as the clogging of the engine filter, which requires cleaning or even replacement of the filter, but in this case, it becomes "engine filter The content of the abnormal situation such as filter mesh clogging occurs" and the advice of "please move to a safe place and replace the filter", and the advice of "please contact the maintenance personnel" is displayed together with the message.

Here, the display of the abnormal state may be displayed by a sign or the like instead of a message, or a mixed display of a message and a sign, etc. In short, as long as the operator can understand the abnormal state more quickly and surely. In addition, it is preferable that a program for eliminating an abnormal state is also displayed so that the operator can easily understand it. In addition, in order for the operator to more reliably understand the occurrence of an abnormal state, it is preferable to use the generation of an alarm sound or the like in combination.

On the monitor 13, unless the above-mentioned abnormal state occurs, the camera video is displayed. However, sometimes it is not necessary to obtain the rear view depending on certain work contents, the movement situation of the hydraulic excavator, and the like. In this case, the monitor 13 can be switched to the vehicle status display screen shown in FIG. 3 . The switching of the screen is triggered by the operation of the changeover switch 31, and the operator can manually switch between the camera image display screen and the vehicle status display screen at any time. In addition, even in the state where the vehicle status display screen is displayed, when an abnormal state occurs, it is automatically switched to the abnormal state display screen.

Communication information can also be displayed on the monitor 13, and a message sent from a management center or the like is displayed by operating the switch 31 from the camera image display screen, that is, by manually operating the operator. Therefore, the operator can receive commands such as work programs and other messages sent from the management center or the like at any time. Of course, during the display of the communication information, if an abnormal situation occurs, it will directly and automatically switch to the abnormal state display screen. After the operator understands the communication information, the operator operates the changeover switch 31 to switch to the camera image display screen.

Also, when the camera 11 is also installed on the arm 3 b of the front working machine 3 , the monitor 13 is switched to display the image from the camera 11 by switching the switch 31 .

(Example 2)

FIG. 9 shows other states of the screen display of the monitor 13 by the control device 20 . In the exemplary embodiment of FIG. 9 , the vehicle status is preferentially displayed on the monitor 13 first. Then, when the selector switch 31 is operated, the monitor 13 switches to a state of displaying a camera image captured by the camera 10 for obtaining a rear view. Also, when obtaining communication information, the screen is switched by operating the changeover switch 31 . On the other hand, when an abnormal state occurs, similarly to the first embodiment, the display screen is automatically switched to the abnormal state display screen using the output signal from the comparison unit 27 as a trigger.

Claims (6)

1. the display unit of a construction machinery, described construction machinery has motor, by this engine-driven hydraulic pump and a plurality of Actuator Divisions of driving by the pressure oil of supplying with from this hydraulic pump, at least the sensor that detects surplus, engine coolant temperature and the working oil temperature of the fuel that supplies to above-mentioned motor is set, according to the unusual abnormal detector of the signal detection duty of these each sensors, and the video camera that monitors periphery; It is characterized in that:

The vehicle condition information optionally show from least 1 sensor output of above-mentioned each sensor is set in the driver's cabin of above-mentioned construction machinery, from the abnormal information of above-mentioned abnormal detector output with from the monitor of the video camera image information of above-mentioned video camera output;

Be connected with control device on this monitor, this control device comprises manual switching device and automatic switching control equipment; Described manual switching device switches feasible any one that shows in above-mentioned vehicle condition information and the video camera image information; Described automatic switching control equipment automatically switches the display abnormality information that makes at least from above-mentioned abnormal detector output abnormality information the time.

2. the display unit of construction machinery according to claim 1, it is characterized in that: also be provided with the communicator that receives message from related facility on above-mentioned construction machinery, available above-mentioned manual switching device switches to the communication information message that is received by this communicator in above-mentioned monitor demonstration from above-mentioned vehicle condition information or video camera image information.

3. the display unit of construction machinery according to claim 2, it is characterized in that: above-mentioned control device makes that often carrying out the video camera image as reference pictures on above-mentioned monitor shows, switches to picture that shows above-mentioned vehicle condition information or the picture that shows reception information by above-mentioned manual switching device.

4. the display unit of construction machinery according to claim 2, it is characterized in that: above-mentioned control device makes and often show above-mentioned vehicle condition information as reference pictures on above-mentioned monitor, shows the picture of above-mentioned video camera image and shows that the picture of reception information can switch demonstration by above-mentioned manual switching device.

5. the display unit of construction machinery according to claim 1 and 2, it is characterized in that: in above-mentioned construction machinery, at least be in setting when following when the charging voltage of battery, or engine cooling water or working oil temperature be in set point of temperature when above, is presented on the above-mentioned monitor as above-mentioned abnormal information.

6. the display unit of construction machinery according to claim 5 is characterized in that: above-mentioned abnormal information is set with comprising initial property, inalterable information and the variable information that can append and delete, and described variable information is set and cancellation by input unit.

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