JP2011006936A - Display device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device of a construction machine which can improve convenience since the operation of displaying a display screen on a display which is the same kind as the most recently displayed display screen on the display becomes unnecessary when it is judged that the construction machine has been started last time and that it has been in a working condition.SOLUTION: When the kind of the most recent display screen displayed on a monitor 13 in the previous working condition is an ML functional screen or an interference prevention functional screen, a display screen which is the same kind as the display screen displayed on the monitor 13 is displayed on the monitor 13 when a key switch 126 is turned on this time. Because of this, since the operation of calling up the most recent display screen displayed on the monitor 13 in the previous working condition becomes unnecessary when the key switch 126 is turned on this time, convenience can be increased. Furthermore, important items associated with the work can be visually identified easily, and it is convenient from a work viewpoint.

Description

  The present invention relates to a display device for a construction machine that displays an operation state or the like of the construction machine.

  In the operator's cab of the construction machine, a display device is provided for allowing an operator to visually recognize the operation status of the construction machine. In this display device, when the displayed screen is switched, the type of the displayed screen is changed, the screen displaying the status of each part of the construction machine such as the water temperature and oil temperature, the screen for the maintenance, and the moment Various screens such as a screen related to the limiter and a screen related to the interference prevention function are displayed (see Patent Document 1).

JP 2006-16916 A

  However, in the conventional construction machine display device described above, when the engine key switch is turned off, for example, a screen for displaying the status of each part of the construction machine such as water temperature and oil temperature, such as a screen related to the interference prevention function ( Even if a screen other than the basic screen is displayed, if the engine key switch is turned off and turned on again, the displayed screen returns to the basic screen. Therefore, for example, when the setting related to the interference prevention function is performed immediately before the engine key switch is turned off last time, and the setting related to the interference prevention function is subsequently performed after the engine key switch is turned on this time, Since the display screen must be switched from the screen to the screen related to the interference prevention function, the operation becomes complicated and the workability is poor.

(1) A display device for a construction machine according to a first aspect of the invention includes a display for switching a plurality of types of display screens including at least a display screen for displaying an operation state of the construction machine, and the construction machine is in a working state. A work state detecting means for detecting whether or not the construction machine is in a non-working state when at least the work state detecting means detects that the construction machine has changed from the working state to the non-working state. A storage means for storing information relating to the display screen displayed on the display, a start detection means for detecting that the construction machine has been started, and a start detection means detecting that the construction machine has been started. And display control means for controlling the display so as to display on the display the same type of display screen as the information based on the information stored in the storage means.
(2) According to a second aspect of the present invention, in the construction machine display device according to the first aspect, when the start of the construction machine is detected by the start detection means, the information stored in the storage means is a predetermined type of display. Display image type determining means for determining whether or not the information is related to the screen, and when the display control means determines that the information stored in the storage means is information related to a predetermined type of display screen. When the start of the construction machine is detected by the start detecting means, the display device is controlled to display the same type of display screen as the information stored in the storage means.
(3) The invention of claim 3 is a display device for a construction machine according to claim 1 or claim 2, which should be displayed with priority over the display when the construction machine is started (priority display item). And a priority display presence / absence determining means for determining whether or not there is a priority display, and when the start detection means detects the start of the construction machine, the display control means determines that there is a priority display item by the priority display presence / absence determination means. Then, prior to displaying the same type of display screen as the information stored in the storage means, a display screen related to the priority display items is displayed on the display.
(4) According to a fourth aspect of the present invention, in the construction machine display device according to any one of the first to third aspects, the work state detection means includes an operation signal for the operation lever and / or an operation signal for the gate lock lever. Based on the above, whether the construction machine is in a working state or not is detected.
(5) According to a fifth aspect of the present invention, in the construction machine display device according to the third aspect, the priority display item is a matter related to the maintenance of the construction machine.

  According to the present invention, the display screen of the same type as the type of the display screen last displayed on the display when the construction machine was started last time and was determined to be in the working state This eliminates the need for an operation for display on the screen, which is highly convenient.

It is a figure which shows the external appearance of the hydraulic shovel as an example of a construction machine. 3 is a diagram illustrating a configuration of a display control device 140. It is a figure which shows the monitor 13 with which the basic screen was displayed. It is a figure which shows the monitor 13 on which the ML function screen was displayed. It is a figure which shows the external appearance of an offset type construction machine (hydraulic excavator 200). It is a figure which shows the monitor 13 on which the interference prevention function screen was displayed. It is a figure which shows the monitor 13 on which the time setting screen was displayed. It is a figure which shows the monitor 13 on which an example of the maintenance screen was displayed. It is a flowchart about control of the display screen of the monitor 13 when the key switch 126 is turned on. It is a figure which shows a modification.

  With reference to FIGS. 1-9, one Embodiment of the display apparatus of the construction machine by this invention is described. FIG. 1 is an external view of a hydraulic excavator as an example of a construction machine according to the present invention. In this hydraulic excavator 100, an upper swing body 102 is mounted on an endless track-type lower traveling body 101 via a swing wheel 110 so as to freely rotate. The upper revolving structure 102 is provided with a revolving frame 103 that forms a structure. A driver's cab 104 is provided on the left side of the front portion of the revolving frame 103, a front work arm 105 is provided at the front center of the revolving frame 103, and a revolving frame 103 is provided. On the rear side, a counterweight 106 for balancing the front work arm 105 is provided.

  The driver's cab 104 is provided with a driver's seat 104a and a display device (monitor) 13. Between the cab 104 and the counterweight 106 on the swivel frame 103, a building cover 107 that defines a machine room is installed. An engine 1 and a hydraulic pump (main pump) 7 driven by the engine 1 are installed in the machine room.

  The front work arm 105 includes a boom 113 attached to the upper swing body 102 so as to be rotatable in the vertical direction by the boom cylinder 114, and an arm connected to the boom 113 and attached to the boom 113 so as to be rotatable in the vertical direction. 115 and a work tool (bucket) 117 that is connected to the tip portion of the arm 115 and attached to the bucket cylinder 118 so as to be rotatable in the vertical direction.

  The display device (monitor) 13 is attached to, for example, a pillar (not shown) so that the operator of the excavator 100 can easily see and does not disturb the view of the operator. The monitor 13 displays the status of each part of the excavator 100 as will be described later, and also displays contents related to settings such as a moment limiter and work range restriction. Even if a key switch 126 described later is operated to the accessory position (ACC position), no screen is displayed on the monitor 13, but when the key switch 126 is operated to the ON position (when the key switch 126 is turned ON). Regardless of the operation position of the gate lock lever (not shown), the monitor 13 displays information about the state of each part of the excavator 100, for example. The monitor 13 and the display screen displayed on the monitor 13 will be described in detail later. The display screen displayed on the monitor 13 is controlled by the display control device 140 shown in FIG. The display control device 140 includes a control unit 141, a sensor signal input unit 142, a key switch signal detection unit 143, a gate lock lever signal detection unit 144, an operation lever signal detection unit 145, a switch signal detection unit 146, A work state screen storage unit 147 and a setting / operation state storage unit 148 are included.

  The control unit 141 includes a CPU and peripheral circuits such as a ROM and a RAM, and controls each unit so that a predetermined display screen is displayed on the monitor 13. The sensor signal input unit 142 receives a signal output from each sensor connected to the sensor signal input unit 142 and transmits the signal to the control unit 141. An angle sensor 121, a pressure sensor 122, a remaining fuel sensor 123, a water temperature sensor 124, and an oil temperature sensor 125 are connected to the sensor signal input unit 142.

  The angle sensor 121 is a sensor that detects the angles of the boom 113, the arm 115, and the bucket 117, and the pressure sensor 122 is a pressure oil pressure in each oil chamber of the boom cylinder 114, the arm cylinder 116, and the bucket cylinder 118. It is a sensor to detect. The remaining fuel sensor 123 is a sensor that detects the remaining amount of fuel in the excavator 100, the water temperature sensor 124 is a sensor that detects the cooling water temperature of the engine 1, and the oil temperature sensor 125 drives each hydraulic actuator. It is a sensor which detects the hydraulic oil temperature of the hydraulic circuit which performs.

  The key switch signal detection unit 143 detects the operation state of the key switch (engine key switch) 126 and outputs information on the detected operation state to the control unit 141. The gate lock lever signal detection unit 144 receives a detection signal of a gate lock lever switch 127 that detects an operation state of a gate lock lever (not shown), and outputs information on the operation state of the gate lock lever to the control unit 141. The operation lever signal detection unit 145 detects the operation state of each operation lever 128 for the operation of the front work arm 105, the traveling operation, and the turning operation, and outputs the detected operation state information to the control unit 141. The switch signal detection unit 146 receives signals output from the switches 129 for switching the display screen of the monitor 13 and inputting various set values, and controls the operation state of each switch 129 to the control unit 141. Output to.

  The work state screen storage unit 147 sequentially stores the types of display screens that the control unit 141 displays on the monitor 13 in the “work state” of the excavator 100. Here, for example, in this embodiment, the “working state” is a state in which the key switch 126 is turned on and the engine 1 is started, and the gate lock is released and the excavator 100 can be moved. Yes, in addition to the state where the operation lever is actually operated, the state where the operation can be started immediately is included. The setting / operating state storage unit 148, like a setting value related to an interference prevention function, which will be described later, is a setting value that has been set or changed by an operator, and information on whether or not the setting value has been set or changed, for example, hydraulic oil replacement Information on the operating state of the excavator 100, such as the later operating time, for example, the presence or absence of important maintenance notices to be notified to the operator, such as when the hydraulic oil replacement time is approaching, is stored.

  Next, the monitor 13 will be described. The monitor 13 is composed of a liquid crystal screen or the like, and as shown in FIG. 3, a screen portion 13A for displaying various information and a button portion 13B for an operator to operate at a position close to the screen portion 13A. This is a display device that is configured to have. The screen portion 13A is divided into a first display area FA and a second display area SA, and the second display area SA is formed as a thin band-like area at the bottom of the screen section 13A. Is divided into a plurality of sections. In the normal time, the water temperature gauge M1, the oil temperature gauge M2, and the fuel fuel gauge M3 are displayed in analog form in the first display area FA, and a clock M4 indicating the current time is displayed in the upper part. An hour meter M5 that is the operation time of the construction machine is displayed. In the present embodiment, the screen on which such information is displayed is referred to as a machine state screen or a basic screen. However, since the oil temperature gauge M2, the clock M4, and the hour meter M5 are not necessarily required, the basic screen is at least a water temperature gauge. What is necessary is just to have M1 and fuel fuel gauge M3.

  In the present embodiment, as shown in FIG. 3, the second display area SA is divided into seven sections, and the divided sections are defined as section forming portions D1 to D7. The area of the screen portion 13A other than the second display area SA, which is a thin band-like area, is assigned to the first display area FA.

  The button unit 13B is a button pressed by an operator, and is configured to have nine buttons F1 to F9 located at the lower part of the screen unit 13A as shown in FIG. That is, the buttons F1 to F7 are arranged in a line immediately below the screen part 13A, and the buttons F8 and F9 are arranged in a line further directly below the button parts F1 to F7. Each of the nine buttons F1 to F9 is provided with a switch 129 corresponding to each button. The button F8 is a button for starting up a function for performing initial settings, and the button F9 is a button for projecting an image of a rear camera (not shown) in order to secure a visual field behind the construction machine. These buttons F8 and F9 are not necessarily essential buttons.

  On the other hand, the buttons F1 to F7 are provided so as to correspond to the partition forming portions D1 to D7 directly above the buttons F1 to F7, respectively. In the partition forming portions D1 to D7, icons indicating the roles played by the buttons F1 to F7 located immediately below are displayed. For example, what is illustrated in FIG. 3 is an icon IC6 “ML” displayed on the partition forming unit D6, which is an icon for calling a moment limiter (ML) function screen described later, and is displayed on the partition forming unit D7. The “interference” icon IC7 is an icon for calling up an interference prevention function (work range restriction function) screen to be described later. That is, in this case, the button F6 plays a role for calling the ML function screen, and the button F7 plays a role for calling the interference prevention function screen. The operator presses the button F6 immediately below the icon IC6 “ML” when calling the ML function screen, and presses the button F7 immediately below the icon IC7 “interference” when calling the interference prevention function screen. As a result, the operator only has to press the button directly below the icon, and thus can intuitively and quickly grasp the button to be pressed.

  Further, an icon IC5 “time” displayed on the partition formation unit D5 is an icon for calling a time setting screen described later, and an icon IC4 “maintenance” displayed on the partition formation unit D4 displays a maintenance screen described later. It is an icon for calling.

  The moment limiter (ML) function can be performed by attaching a hooked attachment to the bucket 117, for example, to perform a crane operation. However, the moment limiter (ML) function is provided for the purpose of preventing a fall during the crane operation. . The ML function screen displays four pieces of information: rated load, actual load, work radius, and suspended load height. Of these, the rated load refers to the limit value of the load of the suspended load, and the actual load refers to the actual load of the suspended load.

  The control unit 141 calculates the posture of the front work arm 105 based on the angle detection signal of the angle sensor 121 received via the sensor signal input unit 142 and the dimensions of each part of the front work arm 105 stored in advance. At the same time, the rated load, work radius, and suspended load height are calculated. The control unit 141 calculates the actual load based on the pressure detection signal of the pressure sensor 122 received via the sensor signal input unit 142 and the calculated posture of the front work arm 105. The control unit 141 causes the monitor 13 to display information on the calculated rated load, actual load, work radius, and suspended load height on the ML function screen.

  In order to display the ML function screen on the monitor 13, as described above, for example, the button F6 immediately below the icon IC6 “ML” displayed on the partition forming portion D6 of the basic screen shown in FIG. That's fine. When the button F6 is pressed, an operation signal of the switch 129 corresponding to the button F6 is output to the switch signal detection unit 146, and information indicating that the switch 129 is operated is output from the switch signal detection unit 146 to the control unit 141. Is done. Upon receiving the information, the control unit 141 displays an ML function screen on the monitor 13 as shown in FIG. 4 and displays the calculated rated load, actual load, work radius, suspension in a predetermined display area of the ML function screen. Each value of the load height is displayed.

  By displaying the ML function screen during the crane operation, the operator can grasp the rated load, the actual load, the work radius, and the height of the suspended load. When it is no longer necessary to display the ML function screen such as when the crane work is completed, the user presses the button F7 immediately below the icon IC8 “display switching” displayed in the section forming unit D1. When the button F7 is pressed, an operation signal of the switch 129 corresponding to the button F7 is output to the switch signal detection unit 146, and information indicating that the switch 129 is operated is output from the switch signal detection unit 146 to the control unit 141. Is done. When the control unit 141 receives the information, the control unit 141 displays a basic screen as shown in FIG. When the button F7 is not pressed, the ML function screen is continuously displayed. However, the control unit 141 calculates the rated load, the actual load, the working radius, and the height of the suspended load for each predetermined period, and calculates the calculated values. Are displayed in a predetermined display area of the ML function screen.

  Next, the interference prevention function will be described. For example, when digging a gutter, the work is performed using an offset construction machine as shown in FIG. In FIG. 5, the offset construction machine (hydraulic excavator 200) is the same as the construction machine shown in FIG. 1, the lower traveling body 101 and the upper swinging body 102, but the front work arm 205 is different. That is, the front work arm 205 of the excavator 200 is connected to a lower boom 213L that is pivotable in the vertical direction by a boom cylinder 214L, and is pivotally connected to the tip of the lower boom 213L in a lateral direction by a swing cylinder 214U. It has an upper boom 213U and an arm connecting portion 213J provided at the tip of the upper boom 213U so as to be swingable in the left-right direction. The front work arm 205 of the excavator 200 is connected to the arm connecting portion 213J and attached to the arm cylinder 216 so as to be vertically rotatable. The front working arm 205 is connected to the tip portion of the arm 215 and is moved up and down by the bucket cylinder 218. And a bucket 117 that is pivotably mounted in the direction.

  The excavator 200 is provided with angle sensors 121 for detecting the angles of the lower boom 213L, the upper boom 213U, the arm 215, and the bucket 117, respectively. In such a hydraulic excavator 200, in order to prevent the front work arm 205 from colliding with the cab 104, a maximum value that can be offset is set, and work that exceeds this maximum value is limited. . At this time, the restriction of work is to lock the boom cylinder 214L, the swing cylinder 214U, the arm cylinder 216, and the bucket cylinder 218 by cutting off the hydraulic pressure.

  Further, depending on the work site, there may be a restriction on the height of the front work arm 205. For example, when working indoors or when there are obstacles such as electric wires, it is necessary to provide a height restriction on the front work arm 205. Further, depending on the work site, there may be a limit on the depth of the front work arm 205. For example, when there is an obstacle such as an embedded pipe at the work site, it is necessary to provide a depth limit on the front work arm 205.

  At this time, the position of the bucket 117 is the deepest in the depth direction, but in the height direction, depending on the posture of the front work arm 205, the case where the base end of the arm 215 is positioned at the highest position and the bucket 117. May be located at the highest position. Therefore, it is necessary to perform control so that the position of the bucket 117 does not exceed the depth limit and the position of the bucket 117 or the position of the base end of the arm 215 exceeds the height limit. is there. Therefore, when the limit is exceeded, the boom cylinder 214L, the arm cylinder 216, and the bucket cylinder 218 are locked by cutting the hydraulic pressure.

  Thus, in order to prevent the front work arm 205 from colliding with the cab 104 or coming into contact with an obstacle, it is necessary to set the offset restriction, height restriction, and depth restriction of the front work arm 205. . The control unit 141 always calculates the offset value, the position of the base end of the arm 215, and the position of the bucket 117 from the angle sensor 121 and the lengths of the arm 215, the upper boom 213U, and the lower boom 213L, and sets the offset limit. When the range of the height limit and the depth limit is exceeded, the boom cylinder 214L, the arm cylinder 216, and the bucket cylinder 218 are locked by cutting the hydraulic pressure.

  When using the interference prevention function, the operator uses the monitor 13 to set an offset limit, a height limit, and a depth limit. At this time, the setting of the offset restriction, the height restriction, and the depth restriction is performed by setting the posture of the front work arm 205 when performing the setting, that is, the position of the base end portion of the arm 215, the position of the bucket 117, and the offset when performing the setting. Done by value.

  In order to display the interference prevention function screen on the monitor 13, as described above, for example, the button F7 immediately below the “ICLE” icon IC7 displayed on the partition forming portion D7 of the basic screen shown in FIG. do it. When the button F7 is pressed, an operation signal of the switch 129 corresponding to the button F7 is output to the switch signal detection unit 146, and information indicating that the switch 129 is operated is output from the switch signal detection unit 146 to the control unit 141. Is done. Upon receiving the information, the control unit 141 displays the interference prevention function screen on the monitor 13 as shown in FIG. 6, and the calculated height, depth, and offset are displayed in a predetermined display area of the interference prevention function screen. Three types of information are displayed. Of these three types of information, the depth is the position of the bucket 117 at that time, and the offset is the offset value of the front work arm 205 at that time. On the other hand, the height is a higher position of the position of the bucket 117 and the position of the base end portion of the arm 215.

  The control unit 141 hides the icon “IC” IC6 “ML” and the icon “IC7” “interference” displayed in the partition forming units D6 and D7 in FIG. ”, An icon IC10“ depth restriction ”on the partition formation portion D2, an icon IC11“ offset restriction ”on the partition formation portion D3, and an icon IC8“ display switch ”on the partition formation portion D7. .

  Unlike the ML function, the interference prevention function needs to set a height limit, a depth limit, and an offset limit. The operator can make these settings by using the buttons F1 to F3. The height limit, the depth limit, and the offset limit may be set by inputting a numerical value that is known in advance or by setting the front work machine 3 to operate, but details are publicly known. Omitted. The setting value is stored in the setting / operation state storage unit 148.

  In order to display the time setting screen on the monitor 13, for example, the button F <b> 5 immediately below the icon IC <b> 5 “time” displayed in the section forming unit D <b> 5 of the basic screen illustrated in FIG. 3 may be pressed. When the button F5 is pressed, an operation signal of the switch 129 corresponding to the button F5 is output to the switch signal detection unit 146, and information indicating that the switch 129 is operated is output from the switch signal detection unit 146 to the control unit 141. Is done. Upon receiving the information, the control unit 141 displays a time setting screen on the monitor 13 as shown in FIG.

  In the time setting screen shown in FIG. 7, the items to be set (changed) can be sequentially changed by pressing the buttons F1 and F2, and the values of the selected items can be changed by pressing the buttons F3 and F4. You can increase or decrease. The set value can be confirmed and registered by pressing the button F5. FIG. 7 shows a state where the “minute” item is selected from the “year”, “month”, “day”, “hour”, and “minute” items.

  In order to display the maintenance screen on the monitor 13, for example, the button F <b> 4 immediately below the “maintenance” icon IC <b> 4 displayed in the section forming unit D <b> 4 of the basic screen shown in FIG. 3 may be pressed. When the button F4 is pressed, an operation signal of the switch 129 corresponding to the button F4 is output to the switch signal detection unit 146, and information indicating that the switch 129 is operated is output from the switch signal detection unit 146 to the control unit 141. Is done. Upon receiving the information, the control unit 141 displays a maintenance screen on the monitor 13 as shown in FIG.

  The screen shown in FIG. 8 is a setting screen related to hydraulic oil replacement timing as an example of a maintenance screen. The items to be set (changed) can be sequentially changed by pressing the buttons F1 and F2, and by pressing the buttons F3 and F4, the value of the selected item can be increased or decreased or turned on / off. The set value can be confirmed and registered by pressing the button F5. FIG. 8 shows a state in which the hydraulic oil replacement interval item is selected among the items.

  In the hydraulic excavators 100 and 200 according to the present embodiment, after the key switch 126 is turned off, the hydraulic excavators 100 and 200 are started again (for example, when the key switch 126 is turned on and the engine 1 is restarted). The display screen of the type described in the following (A) to (D) is displayed on the monitor 13. In the following description, the time before the key switch 126 is turned off and when the excavators 100 and 200 are in the “working state” is simply referred to as the previous working state. Of the display screens displayed on the monitor 13 in the work state, the display screen displayed immediately before the key switch is turned off or the gate lock lever is operated to the lock position, that is, the display state is not changed. The display screen displayed in the work state immediately before entering the non-work state when changing to the work state is referred to as the display screen last displayed on the monitor 13.

(A) If the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, the same type of display screen as that screen is displayed on the monitor 13.
(B) In the case of (A) above, when the type of the display screen last displayed on the monitor 13 in the previous work state is the interference prevention function screen and the set value has been changed The display portion of the changed set value in the interference prevention function screen blinks for a certain time and is displayed on the monitor 13.
(C) If the type of the display screen last displayed on the monitor 13 in the previous work state is neither the ML function screen nor the interference prevention function screen, the basic screen is displayed on the monitor 13.
(D) Even in the cases (A) to (C) above, matters that should be displayed preferentially (priority notifications such as important notices for maintenance such as the time for replacement of hydraulic oil approaching) If there is a display item), the maintenance screen is displayed on the monitor 13 for a certain period of time prior to the display of the ML function screen, the interference prevention function screen or the basic screen. At this time, an item related to a notice important for maintenance (for example, remaining time until hydraulic oil replacement time) blinks and is highlighted.

  The control of the display screen of the monitor 13 when the key switch 126 is turned on will be described based on the flowchart of FIG. When the key switch 126 is turned on, a program for performing this process is started and executed by the control unit 141. That is, when the control unit 141 receives information (signal) that the key switch 126 is turned on from the key switch signal detection unit 143, the setting / operation state storage unit 148 stores information indicating that there is an important maintenance notice. It is determined whether it has been performed (step S1).

  When information indicating that there is an important notification for maintenance is stored in the setting / operation state storage unit 148 (Yes determination in step S1), the control unit 141 displays a maintenance screen on the monitor 13 and is important for maintenance. Each unit is controlled so that the item related to the notification blinks (step S3). Then, the control unit 141 waits until a predetermined time elapses (step S5), and when the predetermined time elapses (step S5 affirmative determination), based on the information stored in the work state screen storage unit 147, the previous time It is determined whether or not the type of the display screen last displayed on the monitor 13 in the work state (that is, the latest display screen type stored in the work state screen storage unit 147) is the ML function screen (step S7). ). On the other hand, when the information indicating that there is an important maintenance notice is not stored in the setting / operation state storage unit 148 (No in step S1), the control unit 141 similarly stores the information in the work state screen storage unit 147. Based on the information that has been displayed, it is determined whether or not the type of the display screen that was last displayed on the monitor 13 in the previous work state was the ML function screen (step S7).

  When the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen (Yes determination in step S7), the control unit 141 displays the ML function screen on the monitor 13 (step S13). . When the ML function screen is displayed on the monitor 13, this program is terminated, and thereafter, similarly to the conventional construction machine, the control unit 141 controls each unit to switch the display screen according to the operation of the operator.

  When the type of the display screen that was last displayed on the monitor 13 in the previous work state is not the ML function screen (No in step S7), the control unit 141 was last displayed on the monitor 13 in the previous work state. It is determined whether or not the display screen type is an interference prevention function screen (step S9). When the type of the display screen last displayed on the monitor 13 in the previous work state is the interference prevention function screen (Yes determination in step S9), the control unit 141 is stored in the setting / operation state storage unit 148. Based on the information, it is determined whether or not the setting value of the interference prevention function has been changed on the interference prevention function screen last displayed on the monitor 13 in the previous work state (step S15).

  When it is determined that the setting value of the interference prevention function has been changed on the interference prevention function screen displayed last on the monitor 13 in the previous work state (Yes in step S15), the control unit 141 performs the interference prevention function. A screen is displayed on the monitor 13, and each part is controlled so that the display location of the changed set value blinks (step S17). Then, the control unit 141 waits until a predetermined time elapses (step S19). When the predetermined time elapses (step S19 affirmative determination), the control unit 141 stops the blinking of the display and displays the interference prevention function screen on the monitor 13. It is displayed (step S21). On the other hand, when it is determined that the setting value of the interference prevention function has not been changed on the interference prevention function screen last displayed on the monitor 13 in the previous work state (No in step S15), the control unit similarly 141 displays an interference prevention function screen on the monitor 13 (step S21). When the interference prevention function screen is displayed on the monitor 13, this program is terminated, and thereafter, similarly to the conventional construction machine, the control unit 141 controls each unit to switch the display screen according to the operation of the operator.

  When the type of the display screen last displayed on the monitor 13 in the previous work state is not the interference prevention function screen (No determination at Step S9), the control unit 141 displays the basic screen on the monitor 13 (Step S11). . When the basic screen is displayed on the monitor 13, this program is terminated, and thereafter, similarly to the conventional construction machine, the control unit 141 controls each unit to switch the display screen according to the operation of the operator.

The hydraulic excavator of the present embodiment has the following operational effects.
(1) If the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, the same type as that screen when the key switch 126 is turned on this time The display screen is configured to be displayed on the monitor 13. Accordingly, when the key switch 126 is turned on this time, an operation for calling the display screen last displayed on the monitor 13 in the previous work state is not required, which is highly convenient. Moreover, it is easy to visually recognize important items related to work, which is convenient for work. For example, when a crane operation is being performed, if the operator temporarily turns off the key switch 126 to get off, gets off the vehicle, gets on again to resume the operation, and turns on the key switch 126, the display screen switching operation is performed. Since the ML function screen is displayed on the monitor 13 even if it is not performed, it is convenient when the work is resumed. Further, if the type of the display screen last displayed on the monitor 13 in the previous work state is the interference prevention function screen, the interference prevention function screen is displayed on the monitor 13 when the key switch 126 is turned on this time. Thus, it is possible to easily determine whether or not important setting changes related to work are reflected.

(2) When the type of the display screen displayed last on the monitor 13 in the previous work state is the interference prevention function screen and the set value has been changed, when the key switch 126 is turned on this time The display portion of the changed set value on the interference prevention function screen blinks for a certain time and is displayed on the monitor 13. Thus, since it is possible to notify the operator that there has been an important setting change related to the work, the operator can be alerted.

(3) If the type of the display screen last displayed on the monitor 13 in the previous work state is not the ML function screen or the interference prevention function screen, the basic screen is displayed on the monitor 13 when the key switch 126 is turned on this time. Configured to be. As a result, for example, a display screen that is not directly related to work, such as a time setting screen or a maintenance screen, is not displayed again on the monitor 13 when the key switch 126 is turned on this time. There is no need for an operation for display, which is convenient.

(4) Even if the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, if there is a priority display item, the current key switch 126 is turned on. The maintenance screen is configured to be displayed on the monitor 13 for a certain period of time. Thereby, since priority display items can be displayed with priority, it is possible to alert the operator about the priority display items.

(5) Based on the state of the key switch 126 and the gate lock lever switch 127, it is configured to determine whether or not it is in the working state. Therefore, as compared with the case where only the on / off state of the key switch 126 is detected, it is possible to more accurately determine whether or not it is a state in which work is being performed (a state where the work is started). As a result, for example, when the operator displays the interference prevention function screen or the ML function screen from the basic screen only for confirmation in the state immediately before getting off when the gate lock is applied immediately before turning off the key switch 126 last time. When it is not necessary to display the interference prevention function screen or the ML function screen first when the key switch 126 is turned on next time, when the key switch 126 is turned on next time, the interference prevention function screen or the ML function screen is displayed. Instead, the basic screen is displayed. In this way, since the type of display screen displayed on the monitor 13 when the key switch 126 is turned on can be made more suitable, unnecessary display screen switching operations can be suppressed.

---- Modified example ---
(1) In the above description, the working state is described as a state in which the key switch 126 is turned on and the gate lock is released, but the present invention is not limited to this. For example, a state where the key switch 126 is turned on and any one of the operation levers is operated may be determined as a working state, the key switch 126 is turned on, the gate lock is released, and A state in which any one of the operation levers is operated may be determined as a working state. Further, the state in which the key switch 126 is turned on and the rotation speed of the engine 1 is maintained at a higher rotation speed than that of normal idling, for example, by operating an idle up knob (not shown) may be determined as a working state. . That is, the state of each part of the excavators 100 and 200 may be appropriately detected, and it may be determined whether or not the working state is based on the detected result. The working state includes not only a state in which the operation lever is actually operated, but also a state in which work is being attempted, a state in which work is being performed, a state in which work is immediately started, and the like.

(2) In the above description, when the key switch 126 is turned on, the display of the monitor 13 is controlled as described above, but the present invention is not limited to this. For example, the display of the monitor 13 is controlled as described above after the key switch 126 is turned on and immediately after the engine 1 is started, or when the engine 1 is started and the gate lock is released. You may comprise. That is, when the start of the engine 1 is detected, or when it is detected that the engine 1 is started and the gate lock is released, the program shown in the flowchart of FIG. 9 is executed. Also good. Further, the program execution start condition shown in the flowchart of FIG. 9 may be the same condition as the condition related to the determination of the work state described above.

(3) In the above description, if the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, when the key switch 126 is turned on this time, Although the display screen of the same type as the screen is configured to be displayed on the monitor 13, the present invention is not limited to this. For example, if the type of the display screen last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, the basic screen is displayed once for a certain period of time when the key switch 126 is turned on this time. Thereafter, a display screen of the same type as that of the display screen last displayed on the monitor 13 in the previous work state may be displayed on the monitor 13.

(4) In the above description, when there is a priority display item, the maintenance screen is displayed on the monitor 13 for a certain period of time when the key switch 126 is turned on this time. However, the present invention is not limited to this. Not. For example, when there is a priority display item, the maintenance screen may be continuously displayed on the monitor 13 until the operator switches the display screen when the key switch 126 is turned on this time. Further, for example, when there is a priority display item, if the number of revolutions of the engine 1 is equal to or less than a predetermined number when the key switch 126 is turned on this time, the maintenance screen is continuously displayed on the monitor 13. If the number of rotations of 1 exceeds a predetermined number of rotations, it may be determined that the work is immediately started, and the display of the maintenance screen may be stopped after a few seconds.

(5) In the above description, as an example of the priority display item, a notification that the hydraulic oil replacement time is approaching is given, but the present invention is not limited to this. For example, a notice that the time for replacement of engine oil is imminent or a notice that it is time for replacement of a filter (Diesel Particulate Filter) that collects particulate matter contained in exhaust gas. Matters are also included. Even if the item is not related to the maintenance, if there is an important matter to be displayed prior to the display of the ML function screen or the interference prevention function screen, this may be used as a priority display item.

(6) In the above description, if the type of the display screen that was last displayed on the monitor 13 in the previous work state is the ML function screen or the interference prevention function screen, when the key switch 126 is turned on this time, Although the display screen of the same type as the screen is configured to be displayed on the monitor 13, the present invention is not limited to this. For example, even when the type of the display screen displayed last on the monitor 13 in the previous work state is a screen other than the ML function screen and the interference prevention function screen, when performing work such as a setting screen for work As long as the screen displays necessary information, the same type of display screen as that screen may be displayed on the monitor 13 when the key switch 126 is turned on this time. As an example of a screen for displaying information necessary for performing the work, for example, an attachment adjustment screen for adjusting the pump flow rate as shown in FIG.
(7) You may combine each embodiment and modification which were mentioned above, respectively.

  Note that the present invention is not limited to the above-described embodiment, and at least a display device that displays a plurality of types of display screens including a display screen that displays an operation state of the construction machine, and a construction machine A work state detection means for detecting whether or not the construction machine is in a work state, and a work immediately before the construction machine is brought into a non-work state when at least the work state detection means detects that the construction machine has changed from the work state to the non-work state. A storage means for storing information relating to the display screen displayed on the display in the state, a start detection means for detecting that the construction machine has been started, and a start detection means for detecting that the construction machine has been started. And display control means for controlling the display so as to display the same type of display screen as the information on the display based on the information stored in the storage means. It is intended to include a display device for a construction machine various structures.

DESCRIPTION OF SYMBOLS 13 Display apparatus (monitor) 100,200 Hydraulic excavator 101 Lower traveling body 103 Turning frame 105 Front work arm 140 Display control apparatus 141 Control part 142 Sensor signal input part 143 Key switch signal detection part 144 Gate lock lever signal detection part 145 Operation lever Signal detection unit 146 Switch signal detection unit 147 Work state screen storage unit 148 Setting / operation state storage unit

Claims (5)

A display for switching and displaying a plurality of types of display screens, including at least a display screen for displaying the operating state of the construction machine;
Working state detecting means for detecting whether or not the construction machine is in a working state;
A display screen displayed on the display unit when the working state detecting unit detects that the construction machine has changed from the working state to the non-working state in the working state immediately before the non-working state is entered. Storage means for storing information about,
Start detection means for detecting that the construction machine is started; and
When it is detected by the start detection means that the construction machine has been started, based on the information stored in the storage means, the display screen of the same type as that information is displayed on the display. A display device for a construction machine, comprising display control means for controlling the display. The display device for a construction machine according to claim 1,
A display image type determining means for determining whether the information stored in the storage means is information relating to a predetermined type of display screen when the start detection means detects the start of the construction machine;
When the display control means determines that the information stored in the storage means is information relating to a predetermined type of display screen, the start detection means detects the start of the construction machine. The display device for the construction machine is controlled so as to display a display screen of the same type as the information stored in the storage means on the display. The display device for a construction machine according to claim 1 or 2,
Further comprising priority display presence / absence judging means for judging whether or not there is a matter to be displayed preferentially on the indicator (priority display matter) when the construction machine is started,
The display control means, when the start detection means detects the start of the construction machine, and when the priority display presence / absence determination means determines that the priority display item is present, the display control means stores the storage means. Prior to displaying a display screen of the same type as that of information, a display screen for the priority display item is displayed on the display device. In the display device of the construction machine according to any one of claims 1 to 3,
The display device for a construction machine, wherein the work state detection means detects whether or not the construction machine is in a work state based on an operation signal of an operation lever and / or an operation signal of a gate lock lever. The display device for a construction machine according to claim 3,
The display device for a construction machine, wherein the priority display item is an item related to maintenance of the construction machine.

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