JP2006076489A - Anti-theft device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-theft device of a construction machine capable of correctly detecting a thief entering a driver's cabin to prevent the theft. <P>SOLUTION: The anti-theft device comprises a plurality of CO2 sensors 28 installed in a driver's cabin 18, and a control means 27 which determines abnormality by a change of CO2 concentration detected by the CO2 sensors 28, prohibits the operation of a construction machine when an abnormality is determined, and notifying the abnormality to the outside by an alarm or radio. Since the abnormality is determined by detecting the change in the concentration of CO2 discharged by the thief, the reliability is higher than the system of detecting the vibration, and since the abnormality can be notified to the outside by radio, the theft of the construction machine can be reliably prevented even at a site where no houses are present around a parking area of the construction machine. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antitheft device that detects carbon dioxide (CO2) discharged by a person and prevents theft of construction machines.

Construction machines such as hydraulic excavators often work in mountainous areas, etc., away from homes, and are parked at work sites after completion of work.
For this reason, theft of construction machines has been frequent in recent years.
Construction machines are expensive, and secondary damages such as using a stolen construction machine to damage a cash deposit machine frequently occur, so countermeasures are demanded.

In view of such circumstances, various antitheft measures have been studied and put into practical use.
For example, the operator of the construction machine is confirmed by an immobilizer, password, fingerprint, etc. If the operator cannot confirm, the construction machine cannot be operated, or a vibration sensor etc. is installed in the construction room of the construction machine. An anti-theft device has been proposed for preventing theft in advance by generating an alarm sound or notifying wirelessly when a subtle vibration that occurs is detected (for example, Patent Documents 1 and 2).
On the other hand, Patent Document 3 proposes a vehicle trunk confinement prevention device that detects CO2 emitted by a person and prevents an infant or the like from being confined in the trunk of the vehicle.
JP 2003-161199 A JP 2002-285582 A JP 2002-38788 A

However, in the anti-theft device in which the operator of the work machine inputs an immobilizer or a personal identification number or identifies the operator by the operator's fingerprint, the anti-theft device can be released if it has such knowledge. Therefore, there is a problem that theft cannot be reliably prevented.
In addition, if the alarm is issued by detecting the vibration of the thief, if there are no people near the construction machine, the alarm cannot prevent theft and detect the subtle vibration. The vibration detectors that are affected by the natural environment such as wind and rain, or may detect vibrations caused by other vehicles passing near the parked construction machine, may malfunction. There are also problems such as being easy.

On the other hand, a confinement prevention device that senses CO2 emitted by a person and prevents an infant or the like from being confined in the trunk of the vehicle does not prevent theft, but it should be applied to the antitheft device in that it senses a person. Is also conceivable.
However, it is possible to detect the concentration of air components that change in a narrow space such as the trunk of a vehicle. However, if a concentration sensor is installed in a relatively large space such as a cab of a construction machine, the concentration change can be detected accurately. There are some problems such as lack of reliability.

  The present invention was made in order to improve such a conventional problem, and provides an antitheft device for a construction machine that prevents theft by accurately detecting CO2 discharged by a thief who has entered a driver's cab. Is intended to

  The anti-theft device for construction machines according to the present invention is an anti-theft device for construction machines provided with a driver's cab, and a plurality of CO2 sensors installed in the driver's cab and abnormalities caused by changes in the CO2 concentration detected by the CO2 sensors. When it is determined and determined to be abnormal, the operation of the construction machine is prohibited, and at the same time, the control unit is configured to notify the abnormality to the outside by an alarm or wireless.

  According to the above configuration, abnormalities are determined by detecting changes in the concentration of CO2 discharged by a thief who has entered the driver's cab. Therefore, compared to those detecting vibrations, it is affected by natural environments such as wind and rain. Because it does not malfunction due to vibrations caused by other vehicles that have passed nearby, it is highly reliable and can be notified of abnormalities by radio, so construction machinery can be used even when there are no houses near the parking lot. Can be surely prevented.

  The construction machine antitheft device according to the present invention has a CO2 sensor in the vicinity of a display means provided with a key switch, a control box in which a control device for controlling the operation of the construction machine is accommodated, and a thief. It was installed so that it would not stand out in the vicinity of the thief's face when working.

  With the above configuration, even if the CO2 sensor is installed in a relatively large space such as a cab of a construction machine, the CO2 discharged by the thief can be reliably detected, so that the reliability is high.

  The anti-theft device for a construction machine according to the present invention enables monitoring and stopping of the cab by the anti-theft device wirelessly from the outside of the cab.

  With the above configuration, you can monitor the theft by turning on the anti-theft device by operation from a portable communication device or communication equipment, or stop monitoring, so forget to turn on the anti-theft device after work Even if you leave the site, you do not need to go to the parking area again.

  The anti-theft device for construction machinery according to the present invention counts the change in the CO2 concentration detected by the CO2 sensor, and determines that it is abnormal when the number of detection times exceeds a preset number of times.

  With the above-described configuration, when the CO2 concentration in the cab is temporarily changed due to CO2 discharged from another vehicle, it is not detected as an abnormality, so that malfunction hardly occurs.

  The antitheft device for a construction machine according to the present invention includes a self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, and a driving machine provided on the revolving body. When a thief works in the vicinity of a display means provided with a key switch in the cab or near a control box containing a control device for controlling the operation of the construction machine, A plurality of CO2 sensors installed so as to be inconspicuous near the face and the change in CO2 concentration detected by the CO2 sensor are counted, and when the number of detection times exceeds a predetermined number of times, it is determined as abnormal. In addition, when it is determined that there is an abnormality, the operation of the construction machine is prohibited, and at the same time, the control means for notifying the abnormality to the outside by an alarm or radio, and monitoring and stopping of the cab by the antitheft device are performed Possible by It is obtained by construction and means for.

According to the above configuration, abnormalities are determined by detecting changes in the concentration of CO2 discharged by a thief who has entered the driver's cab. Therefore, compared to those detecting vibrations, it is affected by natural environments such as wind and rain. Because it does not malfunction due to vibrations caused by other vehicles that have passed nearby, it is highly reliable and can be notified of abnormalities by radio, so construction machinery can be used even when there are no houses near the parking lot. Theft can be reliably prevented, and even if a CO2 sensor is installed in a relatively large space such as a cab of a construction machine, the CO2 discharged by the thief can be reliably detected, so that the reliability is high.
In addition, you can turn on the anti-theft device to monitor the theft or stop monitoring by operating from a portable communication device or communication equipment, so you forget to turn on the anti-theft device after work and leave the site. Even if it is, it is not necessary to go to the parking lot again, and when the change in the CO2 concentration detected by the CO2 sensor exceeds the preset specified number of times, it is determined that there is an abnormality. Cause almost no malfunction.

  According to the antitheft device of the construction machine of the present invention, the abnormality is determined by detecting the change in the concentration of CO2 discharged by the thief who has entered the driver's cabin. It is highly reliable because it is not affected by the natural environment such as rain or malfunctions due to vibrations caused by other vehicles passing nearby.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view of a construction machine including a hydraulic excavator, FIG. 2 is a side view of a cab, FIG. 3 is a plan view thereof, FIG. 4 is a block diagram of an antitheft device, and FIGS. 5 and 6 are operations of the antitheft device. It is a flowchart which shows.
A construction machine including a hydraulic excavator illustrated in FIG. 1 includes a traveling body 1 that can freely travel and a revolving body 2 that is rotatably disposed on the traveling body 1.
The traveling body 1 has a track frame 3 including a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a. An idler 4 is provided at one end of each side frame 3b. A sprocket 6 that is movably supported and is rotationally driven by a traveling motor 5 made of a hydraulic motor is provided on the other end side.
An endless crawler belt 7 is provided between the idler 4 and the sprocket 6, and the crawler belt 7 is driven by the sprocket 6 so that the traveling body 1 can self-propel and the side frame 3b. A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions.

The revolving structure 2 installed on the center frame 3 a of the track frame 3 so as to be able to swivel is constituted by a vehicle body frame 10 at the bottom, and a work machine 11 is mounted at the front center of the vehicle body frame 10.
As shown in FIG. 1, the work machine 11 has a base end pivotally attached to the vehicle body frame 10, a boom 12 that can be raised and lowered by a boom cylinder 13, a base end side pivotally attached to the tip of the boom 12, and an arm cylinder 14. The arm 15 is configured to be pivotable by the arm 15, and the bucket 17 is pivotally attached to the tip of the arm 15 and is pivotable by the bucket cylinder 16.
A cab 18 is installed on the left side of the work machine 11 at the front of the body frame 10, and an engine room 19 is installed at the rear of the body frame 10. A power engine (see FIG. (Not shown) is accommodated, and a counterweight 20 is attached to the rear end of the vehicle body frame 10.

On the other hand, as shown in FIGS. 2 and 3, a driver's seat 21 on which an operator is seated is installed in the operator's cab 18, and work is performed on the front of the armrest portion 21 a of the driver's seat 21 by the work machine 11. An operation lever 22 that is operated when the revolving body 21 is turned is provided, and a traveling lever 23 and a traveling pedal 24 that control the traveling of the traveling body 1 are provided in front of the driver seat 21. For example, on the right side of 23, a display means 25 including a monitor for displaying an operation status and a work status is installed in the pillar.
A control box 26 is installed behind the driver's seat 21, and the control means 27 shown in FIG. 3 is accommodated in the control box 26. The control means 27 is installed in the cab 18. A plurality of CO2 sensors 28 including a first CO2 sensor 28a, a second CO2 sensor 28b, and a third CO2 sensor 28c are connected.
The CO2 sensor 28 generates a signal by detecting that the concentration of CO2 existing in the atmosphere has changed due to CO2 discharged from a person. A sensor with high sensitivity is already on the market. In the embodiment, a commercially available high-sensitivity CO2 sensor 28 is employed.

Further, since the CO2 sensor 28 detects a change in the concentration of CO2 existing in the air, if it is installed in a relatively wide space such as the cab 18, the CO2 concentration that slightly changes cannot be detected or is erroneously detected. Sometimes.
In order to prevent this, in the present embodiment, a CO2 sensor is installed in the following place assuming an action when a thief steals a construction machine.
When a normal thief enters the cab 18, the lock provided on the door of the cab 18 is broken, or the window glass of the door is broken to release the lock from the inside and enter. Thereafter, the engine is often started by directly connecting an electric system around the key switch 29 provided in the vicinity of the display means 25 installed in front of the driver's seat 21.
Therefore, the first CO2 sensor 28 is installed in the vicinity of the display means 25 so that the face of the thief is not conspicuous when the thief performs an operation such as directly connecting the electric system.

If the engine cannot be started even if the electrical system around the key switch 29 is directly connected, the thief approaches the control box 26 in order to modify the control means 28 in the control box 26 and is expected to start work. .
Accordingly, the second and third CO2 sensors 28b and 28c are installed in the vicinity of the control box 26 so that the face of the thief is closest when the control means 28 is touched.
These CO2 sensors 28 are connected to the control means 27 in the control box 26 as shown in FIG. 4, and when a CO2 concentration change is detected, a detection signal is output to the control means 27.
A control determination unit 27a is provided in the control means 27. When the CO2 concentration is determined by the detection signal sent from the CO2 sensor 28 and exceeds a predetermined value (threshold value) set in advance, Processing described in the later-described action is performed.
The control means 27 is provided with a wireless communication unit 27b, a storage unit 27c, and a communication unit 27d connected to the vehicle body network 33.
The wireless communication unit 27b can wirelessly communicate with an external portable communication device 32 through an antenna 31, and can start the antitheft device using the portable communication device 32 even from the outside.

When the anti-theft device is activated, the control means 27 starts to operate, measures the CO2 concentration detected by each CO2 sensor 28, the CO2 concentration is lower than a preset specified value, and the state does not change for a certain period of time. The value is stored in the storage unit 27c, and the CO2 concentration detected by the CO2 sensor 28 is continuously monitored during the operation of the anti-theft device.
The vehicle body network 33 connected to the determination unit 27a through the communication unit 27d includes an information recording unit 36 in addition to the display unit 25, the engine control unit 34, the hydraulic pressure control unit 35, and the like that display the driving situation. When the anti-theft device detects that the thief has entered the operation room 18 when the construction machine is out of service, the intrusion of the thief is transmitted to the external communication facility 38 via the communication means 37. The information is recorded, and at the same time, even if the key switch 29 is turned on, a command is issued via the vehicle body network 33 to prohibit all operations of the construction machine. It can be released only from the communication equipment 38. In FIG. 3, reference numeral 30 denotes alarm means for generating an alarm when an abnormality is detected.

Next, the operation of the antitheft device configured as described above will be described with reference to the flowcharts shown in FIGS.
When the work by the hydraulic excavator is completed and the hydraulic excavator is stopped at the parking lot, the anti-theft device is turned on, and then the cab 18 is locked and parked.
When the antitheft device is turned on, the operation starts from the start shown in FIG. 5. In step S 1, each CO 2 sensor 28 measures the CO 2 concentration and sends the measured value to the control means 27.
In step S2, the control means 27 determines whether the absolute value of the CO2 concentration detected by the first CO2 sensor 28a and the second CO2 sensor 28b of the CO2 sensor 28 is larger than the specified value. If it is smaller than the specified value, the process proceeds to step S3. In step S4, it is determined whether the absolute value of the CO2 concentration detected by the second CO2 sensor 28b and the third CO2 sensor 28c is larger than a specified value.

In step S4, it is determined whether the absolute value of the CO2 concentration detected by the third CO2 sensor 28c and the first CO2 sensor 28a is larger than a specified value. If the absolute value is smaller than the specified value, the process proceeds to step S5 and monitoring is started.
When the CO2 concentration detected by the CO2 sensor 28 in steps S2 and S3 exceeds the specified value, the number of times is counted and stored in the storage unit 27c in steps S2-1, S3-1, and S4-1.
Then, it is determined in steps S2-2, S3-2, and S4-2 whether the number of times the CO2 concentration has exceeded the specified value has exceeded the specified number. If the specified number has not been exceeded, the flow returns to step S1 and the flow is repeated. Again, if the number of times the CO2 concentration exceeds the specified value exceeds the specified number even though it is not the above, an error is displayed on the display means in steps S2-3, S3-3, and S4-3 as a malfunction of the anti-theft device. At the same time, the wireless communication unit 27b notifies the portable communication device 32 and the communication facility 38 that an error has occurred.

On the other hand, during the monitoring operation, each CO2 sensor 28 measures the CO2 concentration in the cab 18 in step S11 of the flowchart shown in FIG. 6, and the CO2 concentration detected by the first CO2 sensor 28a and the second CO2 sensor 28b in step S12. It is determined whether the absolute value is larger than the specified value. If the absolute value is smaller, the process proceeds to step S13 to determine whether the absolute value of the CO2 concentration detected by the second CO2 sensor 28b and the third CO2 sensor 28c is larger than the specified value. If smaller, the process proceeds to step S14.
In step S14, it is determined whether the absolute value of the CO2 concentration detected by the third CO2 sensor 28c and the first CO2 sensor 28a is larger than the specified value. If the absolute value is smaller than the specified value, the flow returns to step S11 to repeat the flow.
If the absolute value of the CO2 concentration detected by the first CO2 sensor 28a and the second CO2 sensor 28b exceeds the specified value in step S12, the process proceeds to step S12-1, and the number is counted. In step S12-2, the number is counted. It is determined whether or not the specified number of times has been exceeded.
And when the frequency | count does not exceed a regulation value, it returns to step S11 and repeats the said flow.

Similarly, when the absolute value of the CO2 concentration detected by the second CO2 sensor 28b and the third CO2 sensor 28c exceeds the specified value in step S13, the process proceeds to step S13-1, and the number of times is counted. In step S13-2, It is determined whether the number of times exceeds the specified number. And when the frequency | count does not exceed a regulation value, it returns to step S11 and repeats the said flow.
Further, when the absolute value of the CO2 concentration detected by the third CO2 sensor 28c and the first CO2 sensor 28a exceeds the specified value in step S14, the process proceeds to step S14-1, and the number of times is counted. In step S14-2, the number of times is counted. It is determined whether or not the specified number of times has been exceeded.
And when the frequency | count does not exceed a regulation value, it returns to step S11 and repeats the said flow.
That is, when the change in the CO2 concentration detected by the CO2 sensor 28c in the cab 18 is equal to or less than the predetermined number of times, it is assumed that no abnormality has occurred in the cab 18 and the monitoring flow is repeated.

On the other hand, when a thief enters the driver's room 18 by unlocking the door 18a of the driver's cab 18 or by breaking the glass, the thief directly connects the key switch 29 provided near the display means 25. Often attempts to start the engine.
At this time, the first CO2 sensor 28a installed in the vicinity of the display means 25 is in the vicinity of the face of the thief, detects CO2 discharged by the thief, and sends it to the control means 27. The control means 27 is a flowchart shown in FIG. In step S12, it is determined that the CO2 concentration has exceeded the specified value, and the number of times is counted in step S12-1.
If the engine cannot be started even if the key switch 29 is directly connected, an operation to start the control means 27 is started in the vicinity of the control box 26 in which the control means 27 is accommodated. The installed second and third CO2 sensors 28b and 28c are in the vicinity of the face of the thief, detect the CO2 discharged by the thief, and send it to the control means 27.

The control means 27 determines whether or not the CO2 concentration sent from the second and third CO2 sensors 28b and 28c exceeds the specified value in steps S13 and S14, and if so, the number of times is determined in steps S13-1 and S14-1. Count.
The thief often repeats the direct connection of the key switch and the operation of trying to start the engine by modifying the control means 27, so that each CO2 sensor 28a, 28b, 28c detects the specified number of times as set in advance. Only when the number of changes in CO2 concentration exceeds the specified value, the process proceeds to steps S12-3, S13-3, and S14-3 to generate an alarm, and at the same time, the communication unit 27d may cause the portable communication device 32 to be stolen. Notify by radio that there is.
In addition, the communication unit 32 of the control unit 27 commands the engine control unit 34, the hydraulic control unit 35, etc. via the vehicle body network 33 to prohibit any control, and the communication facility 38 is also stolen via the communication unit 37. Notify the possibility of occurrence by radio.

As a result, even if the person who has the portable communication device 32 cannot be notified of the theft information for any reason, the administrator of the communication equipment 38 is notified of the theft information. Because of this, it is possible to instruct the aircraft to rush to the parking area, thereby preventing the theft of construction machinery.
In addition, although the example implemented to the hydraulic excavator was demonstrated in the said form of the actual form, it can apply to the construction machine in general which has a driver's cab.

It is a side view of the construction machine which employ | adopted the antitheft device which becomes embodiment of this invention. It is a side view in the cab of the construction machine which employ | adopted the antitheft device which becomes embodiment of this invention. It is a top view inside the cab of the construction machine which employ | adopted the drain apparatus which becomes embodiment of this invention. It is a block diagram of the antitheft device of the construction machine which becomes the embodiment of this invention. It is a flowchart which shows the effect | action of the antitheft device of the construction machine which becomes embodiment of this invention. It is a flowchart which shows the effect | action of the antitheft device of the construction machine which becomes embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 18 Driver's cab 25 Display means 26 Control box 27 Control means 28 CO2 sensor 29 Key switch 32 Portable communication device

Claims (5)

  An anti-theft device for a construction machine equipped with a driver's cab, wherein the abnormality is determined based on a plurality of CO2 sensors installed in the driver's cab and the change in CO2 concentration detected by the CO2 sensor, and the abnormality is determined. And a control means for prohibiting the operation of the construction machine and simultaneously notifying the outside by an alarm or radio.   The CO2 sensor is located in the vicinity of the display means provided with the key switch, in the vicinity of the control box in which the control device for controlling the operation of the construction machine is accommodated, and when the thief works, near the face of the thief The antitheft device for construction machinery according to claim 1, wherein the antitheft device is installed so as not to be conspicuous.   The anti-theft device for construction equipment according to claim 1 or 2, wherein the operation room can be monitored and stopped by the anti-theft device wirelessly from outside the operation room.   The construction machine antitheft device according to any one of claims 1 to 3, wherein a change in the CO2 concentration detected by the CO2 sensor is counted, and an abnormality is determined when the number of detection times exceeds a predetermined number of times set in advance. . An anti-theft device for a construction machine, comprising: a self-propelled traveling body; a revolving body that is pivotably provided on the traveling body; and a cab provided on the revolving body, In the vicinity of the display means provided with the key switch, in the vicinity of the control box in which the control device for controlling the operation of the construction machine is accommodated, and when the thief works, the position near the face of the thief is not conspicuous When a plurality of CO2 sensors installed in this way and the change in the CO2 concentration detected by the CO2 sensor are counted, it is determined that there is an abnormality when the number of detection times exceeds a preset number of times, and it is determined that there is an abnormality In addition, the operation of the construction machine is prohibited, and at the same time, the control means for notifying the outside by an alarm or radio, and the monitoring and stopping of the cab by the antitheft device can be made from outside the cab by radio. Anti-theft system for a construction machine characterized by comprising a stage.

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