JP4896933B2 - Anti-theft device for construction machinery - Google Patents

Description

  The present invention relates to an anti-theft device for construction machinery.

  Various antitheft devices for construction machines have been proposed so far. As an example, a password input screen etc. is displayed on the display screen of the engine coolant temperature, fuel remaining amount, etc., and the password is entered by the input means, and the construction is performed when the entered password matches the previously stored password. A device that releases a locked state of a machine start function or work function is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-70084

  However, in the above-described prior art, when the display device cannot be displayed due to a failure, temperature condition, or the like, the input state of the password cannot be grasped, and it becomes difficult to unlock the construction machine.

  In this state, for example, when the construction machine needs to be moved urgently, such as moving from a place where there is a risk of landslide, the construction machine itself can be moved quickly even though it is operable. It is possible that nothing will happen. Even if it is not urgent, if the password input screen is not visible, it is possible to input the password itself, but it takes time for unlocking, and a corresponding time is wasted. If it cannot be unlocked, the construction machine may be left on the spot.

  The present invention has been made in view of the above, and an object of the present invention is to provide an antitheft device for a construction machine that can support a proper unlocking procedure of a locked state when a password input screen falls into a display impossible state. And

  (1) In order to achieve the above object, the present invention provides an antitheft device for restricting the start of a construction machine, an input means provided with a plurality of push buttons, and an illumination means provided for each of the plurality of push buttons. Display means for displaying the input state of the password input by the input means; password storage means for storing a predetermined password; and the password input by the input means matches the password stored in the password storage means A control means for sending an unlocking signal permitting the start of the construction machine to a start means for starting the construction machine, and a detection means for detecting a state quantity that changes in accordance with the display state of the display means. A threshold value storage means that is set for a detection value of the detection means and stores a threshold value for estimating a display state of the display device, and the control unit includes: When the detection value from the detection means is on the abnormal state side with respect to the threshold value, the state of the illumination means of the plurality of push buttons is changed from the display mode for displaying the password input state on the display device. It shall switch to the alerting | reporting mode which alert | reports.

  As described above, the display state of the display device is estimated from the current consumption of the display device, and when the display state is estimated to be abnormal, the operator is notified of the password input state based on the state of the illumination device of the push button of the input device. Since the mode is switched to the notification mode, it is possible to support the proper unlocking procedure of the locked state even when the password input screen falls into a display impossible state.

  (2) In the above (1), preferably, the front detection means is a current detection means for detecting a current consumption of the display means.

  (3) In the above (1), preferably, the detection means is a temperature detection means for detecting a temperature of the display means.

  (4) In the above (2) or (3), preferably, it further includes mode switching means for switching from the display mode to the notification mode.

  (5) In the above (1), preferably, when the control unit switches to the notification mode, at least one of the total number of characters of the password or the number of input characters as the password input state is set to the plurality of push buttons. It is assumed that the state of the illumination means is changed to on / off / flashing to notify.

  (6) Further, in the above (1), preferably, further comprising an illumination lighting means for turning on the night illumination of the construction machine, and when the control unit inputs a lighting signal from the illumination lighting means, The input state is notified by changing the state of the illumination means of all the push buttons that can be used for inputting the password to lighting or blinking.

  As described above, since the state of the illumination means of the push button is changed to lighting or blinking so as to notify the password input state, even when it is difficult to visually recognize the push button only by natural light, such as at night work, Can be easily recognized.

  ADVANTAGE OF THE INVENTION According to this invention, when the password input screen falls into a display impossible state, the legal cancellation | release procedure of a locked state can be supported.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 10 is a side view showing the overall structure of the hydraulic excavator shown as an example of the construction machine according to the first embodiment of the present invention.

  In FIG. 10, a hydraulic excavator (construction machine) 100 includes a lower traveling body 110, an upper swing body 120, and a front work machine 130.

  The lower traveling body 110 is provided with left and right traveling motors 111 (only one side is shown), and the traveling motor 111 rotationally drives the crawler 112 to travel forward or backward.

  The upper swing body 120 includes a cab 121 in which an operation device (not shown) of the excavator 100 is disposed, a prime mover (not shown) such as an engine, a swing motor (not shown), and the like. The upper revolving unit 120 is revolved right or left with respect to the lower traveling unit 110 by the revolving motor.

  The front work machine 130 includes a boom 131, an arm 132, and a bucket 133. The boom 131 is moved up and down by a boom cylinder 134, and the arm 132 is dumped (opened) or clouded (stucked) by the arm cylinder 135. The bucket 133 is operated to the dump side or the cloud side by the bucket cylinder 136.

  The driver's cab 121 is provided with a key switch (not shown). By inserting a key (not shown) and switching from the OFF position to the ON position, the electric system of the hydraulic excavator is turned on, and from the ON position to the START position. Thus, the starter motor is driven to start a prime mover such as an engine.

  The antitheft device of this embodiment is mounted on such a hydraulic excavator (construction machine) 100.

  Next, an antitheft device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing an overall configuration of the antitheft device according to the present embodiment.

  In FIG. 1, the anti-theft device of this embodiment includes a display device 10 for displaying a password input screen, an input device 30 for inputting a password and the like, and a control device 20 for controlling the operation of the anti-theft device. ing.

  The display device 10 displays various information regarding the excavator 100. When the engine is started (when the key switch is in the ON position), information such as a password input screen and whether or not the lock state can be released is displayed. During normal operation after releasing the locked state (after starting the engine), the state of the excavator (machine information) such as the temperature of the engine coolant and the remaining amount of fuel is displayed.

  The input device 10 includes a plurality of (for example, ten) push buttons 40 to 49 each including a lighting device. Numbers "0" to "9" are displayed one by one on the push buttons 40 to 49 in order. When the engine is started, the operator of the excavator 100 appropriately presses the push buttons 40 to 49 of the input device 10 while confirming the password input state (the total number of characters, the number of input characters, etc.) on the password input screen displayed on the display device 10. By pressing and inputting the password, the locked state (locked state) of the start function or work function of the construction machine 100 is released (described later). In addition, during normal work after releasing the locked state (after starting the engine), input of the machine condition settings according to various work is performed.

  The control device 20 is connected to the display device 10 and the input device 30 via the interfaces 20a and 20c, and controls the overall operation of the anti-theft device including the control device 20, the control unit 21, and the display device 10. A detection unit 22 that detects an operating current supplied from the control unit 21 to the display device 10, a memory 23 that stores a preset password, a timer 24 that counts time, A mode switch 25 that switches an operation method of the input device 30 at the time of password input (hereinafter referred to as an input mode) from a display mode to a notification mode (described later), and a light switch 26 that switches on / off of night illumination. Yes.

  The memory 23 temporarily stores a password storage unit 23a that stores a preset password, a threshold storage unit 23b that stores a threshold value used to estimate the display state of the display device 10, and a password input to the input device 30. It has an input storage unit 23c for storing, and a program storage unit 23d for storing a control program for controlling the operation of the input device 30 and the like.

  The password stored in the password storage unit 23a is used for password verification when starting the engine. This password can be changed as appropriate by an appropriate method. For example, after the engine is started (after password verification is completed), the input device 30 is changed.

  The threshold value storage unit 23b stores a lower limit value or an upper limit value in the specification range of current consumption of the display device 10 or both a lower limit value and an upper limit value as threshold values used for estimating the display state of the display device 10.

  The input storage unit 23c temporarily stores the password input by the input device 30 and is used for password verification when starting the engine. Further, after the engine is started, various setting values input to the input device 30 are temporarily stored.

  The program storage unit 23d stores a control program for controlling the operation of the input device 30 (the operation of the illumination device of the push buttons 40 to 49). For the display mode (described later) and notification according to the password input mode. A control program for a mode (described later) is stored.

  The detection unit 22 is provided in a wiring path for supplying display data (display contents) and an operation current from the control unit 21 to the display unit 10, and an operation current supplied from the control unit 21 to the display device 10, that is, a display The current consumption of the device 10 is detected, and this detected value (current value) is sent to the control unit 21.

  The mode switch 25 switches the password input mode from the display mode to the notification mode. The display mode is a mode in which the password input screen (displayed on the display device 10) indicates a password input state (total number of characters, number of input characters, etc.) to the operator. The notification mode is a mode that indicates the password input state to the operator according to the state (lighting, extinguishing, blinking) of each lighting device of the push buttons 40 to 49 of the input device 30 (details will be described later). The mode switch 25 sends a mode signal to the control unit 21 according to the selected input mode.

  The light switch 26 switches the state (lighting / extinguishing) of night illumination (not shown) that illuminates the vicinity of the front work machine 130 and the like. Further, the light switch 26 sends an illumination signal (lighting signal / light-off signal) to the control unit 21 in accordance with the state of lighting at night (lighting / light-off).

  The timer 24 calculates the operation time of each part of the anti-theft device. For example, according to an instruction from the control unit 21, the timer 24 calculates the blinking time (described later) of the lighting devices of the push buttons 40 to 49 of the input device 30. .

  The control unit 21 includes a display control unit 21a that controls the operation of the display device 10, a mode switching unit 21b that switches a password input mode, a password verification unit 21c that performs verification of a password input to the input device 30, and an input And an input control unit 21d for controlling the operation of the device 30. The control unit 21 exchanges various data and supplies operating current (operating power) with the display device 10 and the input device 30 connected via the interfaces 20a and 20c. The control unit 21 is connected to a host control device (not shown) via the interface 20b. The host control device controls the overall operation of the excavator 100, and controls the operations of the engine, the lower traveling body 110, the upper swing body 120, the front work machine 130, and the like.

  The password collation unit 21c collates the password input to the input device 30 and stored in the input storage unit 23c with the password stored in advance in the password storage unit 23a. The unlocking signal for releasing the locked state and permitting the start is sent to the upper control device that controls the start of the excavator 100 and the like. However, when the password input to the input device 30 and stored in the input storage unit 23c does not match the password stored in advance in the password storage unit 23a (when the input password is incorrect), an unlock signal is sent. Do not send. The host control device starts the engine by driving the starter motor when the key switch position is switched to the START position while receiving the unlock signal, but does not receive the unlock signal. When the position is switched to the START position, the starter motor is not driven. Moreover, the password verification part 21c will be in the state which cannot input a password and the engine start (security lock state), when the input password is an error continuously for a predetermined number of times (for example, 3 times). The security lock state is released by switching the key switch position to the OFF position.

  The mode switching unit 21b sends a mode switching signal to the input control unit 21d based on the detection value from the detection unit 22 and the mode signal from the mode switch 25, and notifies the input mode of the password by the input device 30 from the display mode. Switch to mode.

  The mode switching unit 21b compares the detection value from the detection unit 22 with the threshold value stored in advance in the threshold value storage unit 23b of the memory 23, and estimates that the display state of the display device 10 is normal with respect to the detection value. The input mode is set to the display mode when the display state is on the normal side (normal state side), and the input mode is switched to the notification mode when the display state is on the side estimated to be abnormal (the abnormal state side). For example, when the threshold value stored in advance in the threshold value storage unit 23b is the lower limit value of the specification range of the current consumption of the display device 10, if the detection value from the detection unit 22 is equal to or greater than the threshold value (if it is in the normal state side) The display state of the display device 10 is estimated to be normal and the input mode is set to the display mode. If the detected value is smaller than the threshold value (if it is on the abnormal state side), the display state of the display device 10 is estimated to be abnormal. Then, the input mode is switched to the notification mode.

  When the mode signal from the mode switch 25 is the notification mode (when the notification mode is selected by the mode switch 25), the mode is forcibly switched to the notification mode. That is, the mode switching unit 21b estimates that the display state of the display device 10 is normal and selects the display mode with the mode switch 25, and assumes that the display state of the display device 10 is abnormal. If the notification mode is selected by the mode switch 25, the mode is switched to the notification mode.

  As described above, when the display state of the display device 10 is estimated to be abnormal, by switching the password input mode to the notification mode, it is possible to support a proper release procedure of the lock state of the excavator 100. Further, since the password input mode can be switched to the notification mode by the mode switch 25, when the display state of the display device 10 is abnormal (not displayed), it is estimated that the display state is normal by the mode switching unit 21b. Even in this case, the password input mode can be forcibly switched to the notification mode, and a proper release procedure of the locked state of the excavator 100 can be performed.

  The display control unit 21a controls the operation of the display device 10, and displays information such as a password input screen, lock state release, security lock state when the engine is started (when the key switch is in the ON position). Let During normal operation after releasing the locked state (after starting the engine), the state of the excavator (machine information) such as the temperature of the engine coolant and the remaining amount of fuel is displayed.

  The input control unit 21d controls the operation of the input device 30 using a control program stored in the program storage unit 23d of the memory 23, and the password input to the input device 30 is input to the memory 23 when the engine is started. After sending to the memory | storage part 23c, based on the mode switching signal from the mode switching part 21b, the state (lighting, light extinction, blinking) of each illuminating device of the pushbuttons 40-49 of the input device 30 is controlled, and after a lock state cancellation | release During normal operations, input values from the input means 30 for various settings are sent as appropriate.

  When the mode switching signal from the mode switching unit 21b is the display mode, the input control unit 21d controls the input device 30 using the display mode control program. In this case, when the illumination signal from the light switch 26 is an extinguished signal, all the illumination devices of the push buttons 40 to 49 of the input device 30 (hereinafter referred to as push buttons 40 to 49) are extinguished. Lights all the push buttons 40-49. When the mode switching signal from the mode switching unit 21 is the notification mode, the input device 30 is controlled using the control program for the notification mode. In this case, the operations of the push buttons 40 to 49 of the input device 30 differ depending on whether the illumination signal from the light switch 26 is a turn-off signal or a turn-on signal. Here, the case where the illumination signal is a turn-off signal is referred to as a notification mode (daytime), and the case where the illumination signal is a turn-on signal is referred to as a notification mode (nighttime). It is explained with the procedure.

  First, the states of the push buttons 40 to 49 of the input device 30 will be described with reference to FIG. FIG. 2 is a diagram illustrating the state of the push button 41 on which the number “1” is displayed among the plurality of push buttons 40 to 49.

  The push button 41 has three states: a blinking state (left side in FIG. 2), a lighting state (center in FIG. 2), and a light-off state (right side in FIG. 2). The blinking state is a state in which the lighting state and the unlighting state are switched at regular intervals. This interval is calculated by the timer 24 and controlled by the input control unit 21d. The same applies to the other push buttons 40 and 42 to 49 in the input device 30.

  Next, a password input procedure in the notification mode will be described with reference to FIGS.

  3-5 is a figure which shows the input procedure of the password of the input device 30 in alerting | reporting mode (daytime) by the state of the pushbuttons 40-49 in each procedure. 3A shows A in FIG. 4, B in FIG. 4 shows B in FIG. 5, and C in FIG. 5 shows C in FIG.

  When the engine is started (when the key switch is in the ON position), when the password input mode is switched to the notification mode (daytime), all the push buttons 40 to 49 flash (for example, once / one second) and input. The operator is notified that the mode has been switched to the notification mode (step S100), and after flashing for a certain time (for example, 3 seconds), the push button on which the number “4” indicating the total number of characters (for example, 4 characters) of the password is displayed Only 44 lights up (step S110).

  When the first password is input in this state, the push button 44 displaying the number “4” indicating the total number of characters of the password and the number “1” indicating that the first character of the password has been input are displayed. Only two of the push buttons 41 are lit (step S120), and when the second character password is input, the push button 44 displaying the number “4” indicating the total number of characters of the password and the second character of the password are displayed. Only two of the push buttons 42 on which the number “2” indicating that the input has been completed are lit (step S130), and when the third character password is subsequently input, the number “4” indicating the total number of characters in the password. Only the push button 44 on which “” is displayed and the push button 43 on which the number “3” indicating that the third character of the password has already been input are lit (step S140).

  In this way, in steps S110 to S140, the total number of characters in the password and the number of characters that have already been entered in the password can be confirmed by the input device 30.

  Next, when the password of the fourth character, that is, the password of the total number of necessary characters is input, the password verification unit 21c of the control unit 21 determines whether the password is correct (whether the input password is the same as the password stored in advance). If it is determined (step S150) and the determination result is YES, all the pushbuttons 40 to 49 are lit for a certain time (for example, 3 seconds) (step S160), and then all the pushbuttons 40 to 49 are turned off. The operator is notified that the locked state has been released (step S170).

  In step S150, if the determination result is NO, it is determined whether or not the number of times the input password is different from the previously stored password (NG) exceeds a predetermined number (for example, 3 times) (step S152). If the result is YES, all the push buttons 40 to 49 flash rapidly (for example, twice / one second), and the operator is notified that the excavator 100 is in the security lock state (step S154). If a determination result is NO, it will return to Step S100 of Drawing 3.

6-8 is a figure which shows the input procedure of the password of the input device 30 in alerting | reporting mode (nighttime) in the state of the pushbuttons 40-49 in each procedure. 6 indicates A2 in FIG. 7, B2 in FIG. 7 indicates B2 in FIG. 8, and C2 in FIG. 8 indicates C2 in FIG.

  When the engine is started (when the key switch is in the ON position), when the password input mode is switched to the notification mode (nighttime), all the push buttons 40 to 49 flash (for example, once / one second) and input. The operator is informed that the mode has been switched to the notification mode (step S200), flashes for a certain period of time (for example, 3 seconds), and then a push button on which the number “4” indicating the total number of characters (for example, 4 characters) of the password is displayed. Only 44 blinks, and the other pushbuttons 40 to 43 and 45 to 49 are lit (step S210).

  When the first password is input in this state, the push button 44 displaying the number “4” indicating the total number of characters of the password and the number “1” indicating that the first character of the password has been input are displayed. Only two of the push buttons 41 blink (for example, once / one second), and the other push buttons 40, 42, 43, 45 to 49 are lit (step S220), and then the second character password is input. Only two of the push button 44 displaying the number “4” indicating the total number of characters of the password and the push button 42 displaying the number “2” indicating that the second character of the password has been input are flashing. The other pushbuttons 40, 41, 43, 45 to 49 are lit (step S230). When the third character password is subsequently input, the pushbutton on which the number “4” indicating the total number of characters of the password is displayed. 4 and the two pushbuttons 43 on which the number “3” indicating that the third character of the password has already been entered blinks, and the other pushbuttons 40 to 42 and 45 to 49 are lit (steps). S240).

  As described above, in steps S210 to S240, the total number of characters in the password and the number of characters that have been entered in the password can be confirmed by the input device 30.

  Next, when the password of the fourth character, that is, the password of the total number of necessary characters is input, the password verification unit 21c of the control unit 21 determines whether the password is correct (whether the input password is the same as the password stored in advance). If it is determined (step S250) and the determination result is YES, all the push buttons 40 to 49 blink (for example, once / one second) for a certain time (for example, 3 seconds) (for example, once / one second) (step S260), and then all the push buttons 40 to 49 are. And the operator is notified that the locked state of the excavator 100 has been released (step S270).

  If the determination result is NO in step S250, it is determined whether or not the number of times when the input password is different from the previously stored password (NG) exceeds a predetermined number (eg, 3 times) (step S252). If the result is YES, all the push buttons 40 to 49 are flashed rapidly (for example, twice / one second) to notify the operator that the excavator 100 is in the security lock state (step S254). If a determination result is NO, it will return to Step S200 of FIG.

  As described above, in the notification mode (daytime), the push buttons 40 to 49 are turned on, blinked, or turned off to notify the operator of the password input state. On the other hand, in the notification mode (nighttime), when it is difficult to visually recognize the push buttons 40 to 49 by natural light as in the night work, the push buttons 40 to 49 can be easily seen and the push buttons 40 to 49 are lit. Or by flashing, the operator is notified of the password input state.

  The operation of the present embodiment configured as described above will be described.

<When the display state of the display device 10 is normal>
When the excavator 100 is in the engine stop state, when a key is inserted into the key switch of the cab 121 to change from the OFF position to the ON position and the electric system of the excavator 100 is energized, a password input screen is displayed on the display device 10. The

  When operating at night, the push buttons 40 to 49 of the input device 30 are turned on by switching the light switch 26 to light.

  Next, the password is input using the input device 30 while looking at the password input screen. If the entered password is correct, the display device 10 displays that the locked state has been released. In this state, by changing the key switch from the ON position to the START position, the starter motor is driven and the engine is started.

  If the entered password is incorrect, it is displayed on the display device 10 that the locked state cannot be released, so the password is input to the input device 30 again. If the password is incorrect for a predetermined number of times (for example, 3 times), the display device 10 displays that the security lock state has been entered, and the password cannot be entered and the engine cannot be started. In this case, when the key switch is set to the OFF position and then set to the ON position again, the password input screen is displayed again on the display device 10, and the password can be input. If the entered password is correct, the display device 10 displays that the locked state has been released. In this state, by changing the key switch from the ON position to the START position, the starter motor is driven and the engine is started.

<When display state of display device 10 is abnormal (daytime)>
When the excavator 100 is in the engine stopped state, the password input screen of the display device 10 is displayed even when the key is inserted into the key switch of the cab 121 to change from the OFF position to the ON position and the electric system of the excavator 100 is energized. Without
All the push buttons 40 to 49 of the input device 30 blink (step S100 in FIG. 3), and then only the push button 44 (the number “4”) is lit (step S110 in FIG. 3). Subsequently, when a password is input to the input device 30, a number indicating the number of characters already input is sequentially turned on in accordance with this (step S120 in FIG. 3 to step S140 in FIG. 4). When a password (4 characters) of the required total number of characters is input and this password is correct, all the push buttons 40 to 49 are lit for 3 seconds, and then all the push buttons 40 to 49 are turned off (step S160 in FIG. 4). Step S170). In this state, by changing the key switch from the ON position to the START position, the starter motor is driven and the engine is started.

  If the input password is incorrect, all the push buttons 40 to 49 of the input device 30 blink (step S100 in FIG. 3), and then only the push button 44 (number “4”) is lit (step S110 in FIG. 3). The password is input again to the input device 30. When an incorrect password is input three times, the push buttons 40 to 49 blink rapidly (step S154 in FIG. 5). In this state, the password cannot be entered and the engine cannot be started. In this case, the password can be input again by returning the key switch to the OFF position and then to the ON position.

<When there is an abnormality in the display state of the display device 10 (nighttime)>
Even when the excavator 100 is in the engine stop state, the light switch 26 is switched on, a key is inserted into the key switch of the cab 121 to change from the OFF position to the ON position, and the electric system of the excavator 100 is turned on. 10 password input screen is not displayed,
All the push buttons 40 to 49 of the input device 30 blink (step S200 in FIG. 3), and then only the push button 44 (number “4”) blinks, and the other push buttons 40 to 43 and 45 to 49 are lit (FIG. 3). 3 step S210). Subsequently, when a password is input to the input device 30, numbers indicating the number of characters that have already been input flash in sequence (step S 220 in FIG. 6 to step S 240 in FIG. 7). When a password (4 characters) of the required total number of characters is input and this password is correct, all the push buttons 40 to 49 blink for 3 seconds, and then all the push buttons 40 to 49 are lit (step S260 in FIG. 7). Step S270). In this state, by changing the key switch from the ON position to the START position, the starter motor is driven and the engine is started.

  If the entered password is incorrect, all of the push buttons 40 to 49 of the input device 30 blink (step S200 in FIG. 6), and then only the push button 44 (number “4”) is lit (step S210 in FIG. 6). The password is input again to the input device 30. When an incorrect password is input three times, the push buttons 40 to 49 blink rapidly (step S254 in FIG. 8). In this state, the password cannot be entered and the engine cannot be started. In this case, the password can be input again by returning the key switch to the OFF position and then to the ON position.

  In the present embodiment configured as described above, when the display state of the display device is estimated from the current consumption of the display device 10 and it is estimated that the display state is abnormal, the push buttons 40 to 49 of the input device 30 are Since the mode is switched to the notification mode for notifying the operator of the password input state depending on the state of the lighting device, it is possible to support a proper unlocking procedure of the locked state even when the password input screen falls into a display impossible state.

  Further, since the mode switch 25 for switching to the notification mode is provided so that the password input mode can be switched to the notification mode, the display state is changed from the current consumption of the display device 10 even though the actual display state is abnormal. Even when it is estimated to be normal and the mode is not switched to the notification mode, the mode can be forcibly switched to the notification mode, and a proper release procedure of the lock state can be supported.

  In this embodiment, the total number of characters of the password that needs to be input is four. However, the number is not limited to this, and any number of characters may be used as long as it is less than the number of push buttons provided in the input device.

  Moreover, although the case where the characters displayed on the pushbuttons 40 to 49 of the input device 30 and input as the password is a number has been described as an example, the present invention is not limited thereto, and other characters (such as English letters and katakana) may be used.

  In the present embodiment, the lighting device states of the push buttons 40 to 49 of the input device 30 have been described as examples of lighting, extinguishing, and blinking. However, the present invention is not limited to this, and the lighting device state includes color and brightness. May be used.

  It should be noted that the engine start in the notification mode, that is, when the display state of the display device 10 is abnormal is an urgent countermeasure, and therefore, the turning operation of the upper swing body 120 that is an operation other than the traveling of the hydraulic excavator 100 and the front It is preferable to limit the operation of the work machine 130 as much as possible. For example, it is conceivable to limit the operation speed of operations other than traveling to the minimum speed necessary for making the aircraft movable so that normal operations cannot be performed.

  A second embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, a detector 22A for detecting the temperature of the display device 10 is provided instead of the detector 22 in the first embodiment. In the figure, members equivalent to those in FIG.

  FIG. 9 is a diagram showing an overall configuration of an antitheft device according to the second embodiment of the present invention.

  In FIG. 9, the antitheft device of the present embodiment includes a detection unit 22A that detects the display device 10 or the ambient temperature thereof.

  The detection unit 22 </ b> A is provided on the outer periphery of the display device 10, detects the operating temperature of the display device 10, and sends the detected value (temperature) to the control unit 21.

  The mode switching unit 21b of the control unit 21 compares the detection value from the detection unit 22A with the threshold value stored in advance in the threshold value storage unit 23b of the memory 23, and the display state of the display device 10 is normal with respect to the detection value. The input mode is set to the display mode when it is on the estimated side (normal state side), and the input mode is switched to the notification mode when the display state is on the estimated side (abnormal state side). . For example, when the threshold value stored in advance in the threshold value storage unit 23b is the lower limit value of the specification range of the operating temperature of the display device 10, if the detection value from the detection unit 22A is equal to or greater than the threshold value (if it is in the normal state side) The display state of the display device 10 is estimated to be normal and the input mode is set to the display mode. If the detected value is smaller than the threshold value (if it is on the abnormal state side), the display state of the display device 10 is estimated to be abnormal. Then, the input mode is switched to the notification mode.

  Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the display state of the display device is estimated from the operating temperature of the display device 10, and when it is estimated that the display state is abnormal, the push buttons 40 to 49 of the input device 30 Even when the display device 10 (for example, liquid crystal) is difficult to display in a place where the temperature is very low, such as in a cold district, it becomes difficult to display because the mode is switched to a notification mode that notifies the operator of the password input state depending on the state of the lighting device. It is possible to support a proper unlocking procedure of the locked state, and work can be started immediately.

It is a side view showing the whole antitheft device structure concerning a 1st embodiment of the present invention. It is a figure explaining the state of the pushbutton of an input device. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (daytime) by the state of the pushbutton in each procedure. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (daytime) by the state of the pushbutton in each procedure. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (daytime) by the state of the pushbutton in each procedure. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (night) by the state of the pushbutton in each procedure. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (night) by the state of the pushbutton in each procedure. It is a figure which shows the input procedure of the password of the input device in alerting | reporting mode (night) by the state of the pushbutton in each procedure. It is a side view showing the whole antitheft device structure concerning a 2nd embodiment of the present invention. It is a side view showing the whole structure of the hydraulic excavator shown as an example of the construction machine concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Control apparatus 20a, 20b, 20c Interface 21 Control part 21a Display control part 21b Mode switching part 21c Password collation part 21d Input control part 22, 22A Detection part 23 Memory 23a Password storage part 23b Threshold storage part 23c Input storage part 23d Program storage unit 24 Timer 25 Mode switch 26 Light switch 30 Input device 40-49 Push button 100 Construction machine 110 Lower traveling body 120 Upper turning body 121 Driver's cab 130 Front work machine

Claims (6)

In an anti-theft device that limits the start of construction machinery,
Input means provided with a plurality of push buttons;
Illumination means provided in each of the plurality of push buttons;
Display means for displaying an input state of a password input by the input means;
Password storage means for storing a predetermined password;
Control means for sending an unlocking signal for permitting the start of the construction machine to the start means for starting the construction machine when the password entered by the input means matches the password stored in the password storage means;
Detecting means for detecting a state quantity that changes in accordance with a display state of the display means;
Threshold value storage means that is set for the detection value of the detection means and stores a threshold value for estimating the display state of the display device;
The control unit changes the state of the illumination means of the plurality of push buttons from a display mode in which a password input state is displayed on the display device when a detection value from the detection means is on an abnormal state side with respect to the threshold value. An anti-theft device for construction machinery, wherein the anti-theft device is switched to a notification mode for notifying a password input state. In the construction machine antitheft device according to claim 1,
The construction machine antitheft device, wherein the detection means is current detection means for detecting current consumption of the display means. In the construction machine antitheft device according to claim 1,
The construction device antitheft device, wherein the detection means is a temperature detection means for detecting a temperature of the display means. In the construction machine antitheft device according to claim 3 or 4,
An antitheft device for construction machinery, further comprising mode switching means for switching from the display mode to the notification mode. In the construction machine antitheft device according to claim 1,
When the control unit is switched to the notification mode, at least one of the total number of characters or the number of input characters as the password input state is changed to lighting / extinguishing / flashing of the lighting means of the plurality of push buttons. An anti-theft device for construction machinery, characterized in that it is notified. In the construction machine antitheft device according to claim 1,
It further comprises illumination lighting means for lighting the night illumination of the construction machine,
When the lighting signal from the lighting lighting means is input, the control section notifies the password input state by changing the lighting means of all push buttons that can be used for password input to lighting or blinking. An anti-theft device for construction machinery.

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