JP2001098587A - Antitheft device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent illicit use of an engine key by another person even when an owner of a construction machine stays in a distant place. SOLUTION: A power switch 2 is arranged in the cab of a hydraulic excavator, and a power source is supplied to a fuel solenoid valve 3 via a relay 4 from this power switch 2. ON/OFF operation of the relay 4 is performed by a control part 1, and a code input device 6, a camera 8 and a transmitter 9 are connected to this control part 1. Thus, when an identification code inputted via the code input device 6 is a prescribed code, the relay 4 is turned on the start an engine, and while, when an inputted identification code is not a prescribed code, the relay 4 is turned off to stop starting of the engine, an operator in the cab is photographed by operating the camera 8 to remotely transmit the image data and an alarm signal to an external receiver 10 from the transmitter 9. A buzzer 11 and a display device 12 are connected to this receiver 10 to buzz the buzzer 11 by the alarm signal to display the image data on the display device 12 to enable a controller staying in a place distant from the hydraulic excavator to confirm illicit use of an engine key.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine antitheft device for preventing construction machines such as hydraulic excavators from being stolen.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic shovel generally includes an engine which is a power source of the construction machine, and an operator's cab in which a power switch for starting the engine is installed. In such a construction machine, in order to prevent theft and mischief, the cab is locked when the construction machine is not used, and a specific engine key that can be inserted into the key groove of the power switch is used. The owner can enter the cab and start the engine.

[0003]

In the above-mentioned prior art, if any person can obtain an engine key, the engine key can be used to unlock the cab and the power switch installed in the cab can be used. Since the engine can be started by inserting the engine key into the key groove, there is a problem that theft of the construction machine by someone other than the authorized owner cannot be prevented. In particular, if the construction equipment is located away from its legal owner,
Since the use status of the construction machine cannot be determined, the risk of theft increases, and even if the construction machine itself is not stolen, there is a problem that mischief such as damage to instruments in the cab cannot be prevented. .

[0004]

SUMMARY OF THE INVENTION According to the present invention, a person entering a cab of a construction machine is checked by a secret code to determine whether or not the driver is a regular driver, and the engine is activated only when the driver is confirmed to be a regular driver. And if it is confirmed that the driver is not a legitimate driver, disable the engine and
The abnormal signal is transmitted to an external receiver remotely. With this configuration, even if another person illegally obtains the engine key, not only the construction machine can be prevented from being stolen, but also the owner at a remote place can be notified that the construction machine has been illegally used.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a construction machine antitheft device according to the present invention, an engine as a power source of a construction machine, starting means for enabling the engine to start, and a code input device provided in a cab are provided. A code determining unit for determining whether the password input to the code input device is a predetermined code, and a transmitting unit for remotely transmitting an abnormal signal to an external receiving unit. When the determined security code is determined to be a predetermined one, the starting means enables the engine to be started, the operation of the transmission means is stopped, and the code determination unit converts the input security code into a predetermined security code. When it is determined that the received signal is not an abnormal one, the engine is stopped and the transmitting means is operated to remotely transmit an abnormal signal to an external receiver.

With this configuration, the engine cannot be started if the password is not the predetermined code, so that even if another person illegally obtains the engine key,
It is possible to prevent construction equipment from being stolen, and since the abnormal signal is transmitted to external receiving means remotely, even if the owner is away from the construction equipment, it is possible to know the unauthorized use without fail. it can.

It is preferable to use one or both of an alarm signal and image data of a driver as the abnormal signal remotely transmitted from the transmitting means. In the case of including, if the display unit and the recording unit of the image data are provided in the receiving means, the figure of the unauthorized user can be displayed or recorded, and this is used as history information to prevent the unauthorized user from escaping. be able to.

[0008]

Embodiments will be described with reference to the drawings.
FIG. 1 is a block diagram showing a construction machine antitheft device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a processing procedure of the antitheft device.

As shown in FIG. 1, a hydraulic excavator as an example of a construction machine includes a control unit 1, a power switch 2 for supplying power to the control unit 1, and a fuel which enters a combustion chamber of an engine (not shown). A fuel solenoid valve 3 to be stopped and a relay 4 for selectively shutting off the power supplied to the fuel solenoid valve 3 are provided, and the power switch 2 is installed in an operation room (not shown). The control unit 1 includes a code input instruction lamp 5, a code input device 6, a code reading start switch 7,
The camera 8 and the transmitter 9 are connected. Of these, the code input instruction lamp 5, the code input device 6, the code reading start switch 7, and the camera 8 are installed at predetermined positions in the cab.

The code input instruction lamp 5 is turned on by the control unit 1.
Is turned on, and the driver in the driver's cab is prompted to input a recitation code. The code input device 6 is, for example, 4
The code reading start switch 7 is made up of a numeric keypad capable of inputting a digit reciting number, and causes the control unit 1 to read an input code input to the code input device 6. here,
When the recitation code input to the code input device 6 is incorrect, an operation command signal is output from the control unit 1 to the camera 8, and the camera 8 captures an image of the driver in the cab. Camera 8
Is captured by the control unit 1, which outputs the image data and the alarm signal to the transmitter 9, which transmits the image data and the alarm signal to the receiver 10. Send. The receiver 10 is located near the owner or manager of the excavator, and a buzzer 11 and a display device 12 are connected.
The buzzer 11 sounds in response to the alarm signal received by the receiver 9, and notifies the manager or the like of the sound. The display device 12 displays the image data received by the receiver 9 on a display, and can record the image data and print out the recorded data as needed.

In the embodiment constructed as described above,
According to the processing procedure shown in FIG. 2, the hydraulic excavator is prevented from being stolen. That is, when the driver who has obtained the engine key enters the driver's cab and operates the power switch 2 using the engine key, it is determined whether or not the power switch 2 is turned on in the procedure 1, and when the power switch 2 is turned on. Power is supplied to the control unit 1, and the control unit 1 is turned on as a procedure 2. When the control unit 1 is turned on, as a procedure 3, the code input instruction lamp 5 is turned on to prompt the user to input a recitation code. Then, the driver confirms that the code input instruction lamp 5 is turned on.
After the user inputs the recitation code, the controller 1 turns on the code reading start switch 7 as a procedure 5, thereby causing the control unit 1 to read the driver recitation code. Thereby, the control unit 1 determines whether or not the input code is correct in the procedure 6.

If it is determined in step 6 that the input code is correct, that is, if it is determined that the person who entered the recitation code is a legitimate driver, the process proceeds from step 6 to step 7. In step 7, the control section 1 turns on the relay 4 to supply power to the fuel solenoid valve 3, and in step 8, the engine can be started, and the code input instruction lamp 5 is turned off. Therefore, the authorized driver can operate the engine key from the accessory mode to the ignition mode to start the engine and perform various operations.

On the other hand, if it is determined in step 6 that the input code is incorrect, the control section 1 determines the number of times of reading of the recitation code in step 9 and returns to step 4 if the code input is less than three times. The lighting of the code input instruction lamp 5 is maintained to urge the driver to re-enter the recitation code. Step 9
If it is determined that the chord input is not performed within three times in step (i), that is, if a correct rehearsal code is not input within three times, the procedure proceeds from step 9 to step 10. In this procedure 10, the control unit 1 keeps the relay 4 OFF to shut off the power supply to the fuel solenoid valve 3 and stops the fuel entering the combustion chamber of the engine, thereby making it impossible to start the engine. Further, as a procedure 11, the camera 8 is operated by an operation command signal from the control unit 1, and an image of the driver is taken by the camera 8. The image data photographed by the camera 8 is taken into the control unit 1, and as a procedure 12, the control unit 1 outputs the image data and the alarm signal to the transmitter 9, and the transmitter 9 transmits the image data and the alarm signal to an external device. Remote transmission to the receiver 10 is performed. As a result, the buzzer 11 connected to the receiver 10 sounds in response to the alarm signal, and the driver's appearance is displayed on the display of the display device 12 connected to the receiver 10 by image data.
Therefore, the administrator or the like having the receiver 10 can know in real time that a person other than the authorized driver has entered the cab by listening to the ringing sound or looking at the display screen, and can therefore know the hydraulic excavator. Going straight to the site where it is located can prevent theft and mischief. Further, when the thief escapes, if image data is recorded on a recording device attached to the display device 12 or if the recorded data is printed out, the recorded data can be used as criminal history information. Re-entry can be effectively prevented.

When a legitimate driver inadvertently inputs a recitation code three times or more by mistake, image data and an alarm signal are remotely transmitted from the transmitter 9 to the receiver 10 as described above. However, the administrator or the like can see that the driver is displayed on the display device 12 and determine that the driver is not stolen. Further, in this case, if the power supply switch 2 is turned off once and then turned on after returning to the procedure 1, the above-described procedure can be executed again. The engine can be started.

As described above, in the above embodiment, when the recite code input through the code input device 6 is not a predetermined code, the relay 4 is kept OFF to prevent the engine from being started, so that the owner other than the authorized owner is required. Even if another person illegally obtains the engine key, theft of the construction machine can be reliably prevented. In addition, when the input recitation code is incorrect a predetermined number of times (three times in the embodiment), the transmitter 9 on the construction machine side transmits the camera 8 to the external receiver 10.
Image data and abnormal signals such as alarm signals are remotely transmitted, so that even if the manager who owns the receiver 10 is away from the construction machine, unauthorized use of the engine key by others can be performed in real time. You can know for sure. Further, the display device 12 connected to the receiver 10
If the image data is recorded on the computer or the recorded data is printed out, the recorded data can be used as criminal history information, and re-entry by the same criminal can be effectively prevented.

[0016]

The present invention is embodied in the form described above and has the following effects.

A person entering the operator's cab of the construction machine is confirmed by a personal identification code as to whether or not the driver is an authorized driver, and the engine can be started only when it is confirmed that the operator is an authorized driver,
If it is confirmed that the driver is not a legitimate driver, the engine will not be able to be started, and an abnormal signal will be transmitted to an external receiver remotely. In addition to preventing theft of the engine key, even if the owner of the construction machine is away from the construction machine, it is possible to reliably know that the engine key has been illegally used by another person.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a construction machine antitheft device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the anti-theft device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control part 2 Power switch 3 Fuel solenoid valve 4 Relay 5 Code input instruction lamp 6 Code input device 7 Code reading start switch 8 Camera 9 Transmitter 10 Receiver 11 Buzzer 12 Display device

Claims (5)

[Claims] An engine which is a power source of a construction machine, a starting means for starting the engine, a code input device provided in a driver's cab, and a secret code input to the code input device are designated by a predetermined code. A code judging unit for judging whether or not the code is a code, and a transmitting means for remotely transmitting an abnormal signal to an external receiving means, when the code judging unit judges that the inputted security code is a predetermined one. Enabling the engine to be started by the starting means, stopping the operation of the transmitting means, and stopping the start of the engine when the code determining unit determines that the inputted password is not a predetermined one. An anti-theft device for a construction machine, wherein the transmitting means is operated to remotely transmit an abnormal signal to an external receiving means. 2. The anti-theft device for a construction machine according to claim 1, wherein the abnormal signal is an alarm signal. 3. The anti-theft device for a construction machine according to claim 1, wherein the abnormal signal is image data of a photographed driver. 4. The anti-theft device for a construction machine according to claim 1, wherein the abnormal signal includes both an alarm signal and image data of an image of a driver. 5. The anti-theft device for a construction machine according to claim 3, wherein the receiving means has a display unit and a recording unit for the image data.