JP2001082010A - Burglarproof system of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain usability and improve the degree of security by changing at one time certified codes given to respective construction machines, when a burglarproof system concerning many sets of construction machines is constructed to control these construction machines. SOLUTION: This burglarproof system is constituted of a key switch 12 provided on a construction machine, a control device 19, and a key 13 mounted on the key switch 12. The key switch 12 is provided with a contact 14 outputting an electric power source ON signal when the key is on the ON position, a trigger signal outputting means 17, and a receiving means 21. The key is provided with a key memory 15 memorizing a specific code, and a code signal outputting means 16. The control device 19 collates the specific code signal from the key with a certified code stored in a certified code memory 20, and when both coincide with each other, an electric power source ON signal is made valid. This burglarproof system of a construction machine is provided with a code transmitting device changing the certified code stored in the certified code memory 20 of the control device 19 by external operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for a construction machine, and more particularly, to an aerial propagation signal relating to a specific code for identification from a key inserted into a mechanical switch structure of a key switch of a construction machine. An anti-theft device that activates a power-on signal when a matching between a specific code given from a key and an authentication code previously stored in a memory of a control device of the construction machine is stored in a memory of the construction machine. The present invention relates to an anti-theft device for construction machinery in which an authentication code can be changed from outside.

[0002]

2. Description of the Related Art As a device for preventing a vehicle from being stolen, a device disclosed in Japanese Patent Application No.
There is an apparatus disclosed in JP-A-7-76261. The anti-theft device disclosed in this document inserts a key having a built-in transmitting unit into a key cylinder of a starting key switch provided in a vehicle, and in this state, transmits from the key to the airborne transmission of a specific code for identification. On the other hand, the control device on the vehicle side is provided with a receiving unit and a storage unit (memory), which is stored in advance as a code (authentication code) used for authentication, and is given by radio waves from a key. The specific code and the authentication code stored on the vehicle side are collated, and when they match, the power-on signal is validated. In the above-mentioned document, especially when the two do not match in the first collation operation, the collation operation can be performed a plurality of times without removing the key from the key cylinder, and as a result, reliable collation can be performed. The operation can be performed. As a basic configuration, according to the above-described anti-theft device, the relationship between the starting key switch and the key, the combination of the specific code given to the key and the authentication code stored in the storage unit of the control means on the key switch side are determined. Increases security against theft.

[0003]

As described above, in the conventional vehicle anti-theft device, the security against theft is increased by a combination of a key switch for starting and a specific code for identification. Since the code is set, it corresponds to one vehicle. Therefore, for example, when the vehicle is a construction machine, and a rental company owns a large number of construction machines and manages and rents these construction machines individually, a plurality of construction machines are rented in order to prevent theft. Multiple keys are required for each of the construction machines. Since these many keys have different specific codes, anti-theft management becomes very troublesome. On the other hand, it is also possible to adopt a configuration in which the identification codes of a number of construction machines are the same, and a number of construction machines are managed with the same identification code. In this case, since there is only one type of identification code, one type of key can be used. However, in this case, by obtaining one key related to one construction machine, it becomes possible to operate all other construction machines, so that the security degree is very low from the viewpoint of theft prevention.

[0004] An object of the present invention is to solve the above-mentioned problems. For example, when a certain company owns a large number of construction machines and constructs an anti-theft system to manage these construction machines. One identification code given to a key is stored as an authentication code in each storage unit of a large number of construction machines to achieve ease of use in which all keys can be started with one key. An object of the present invention is to provide a construction machine anti-theft device capable of realizing a high degree of security by changing an authentication code given to each of the construction machines at a time.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a construction machine antitheft device according to the present invention is configured as follows. The anti-theft device for a construction machine according to the present invention includes a key switch and a control device provided on a vehicle side of the construction machine, and a key mounted on the key switch. The key switch has a mechanical switch structure and a contact (which are called switch means) for outputting a power-on signal when the mounted key is in an ON position, a trigger signal output means for transmitting a trigger signal, and an airborne signal. Receiving means for receiving. The key includes a key memory (EEPROM) for storing a specific code for identification in advance, and a code signal output means for reading out the specific code stored in the key memory when a trigger signal is given and generating an airborne signal of the specific code. . Further, the control device causes the trigger signal output means to output a trigger signal when the power-on signal is output from the switch means, and in response thereto, the specific code from the key code signal output means received by the reception means. Is compared with an authentication code stored in an authentication code memory (EEPROM), and when both match, the power-on signal is validated. Further, the construction machine antitheft device includes an authentication code changing device (code transmission device) that allows an authentication code stored in an authentication code memory of the control device to be changed by an external operation. In the anti-theft device for construction machines, as an anti-theft system, when the key corresponding to the construction machine is stolen, for example, the authentication code stored in the authentication code memory of the control device of the construction machine is changed by the authentication code changing device. , So that the function of the stolen key can be disabled, that is, disabled. In particular, a rental company such as a hydraulic excavator stores the same authentication code in each hydraulic excavator and provides the same specific code to each key of each hydraulic excavator in relation to the management of use of a plurality of hydraulic excavators for rental. Since the shovel is configured to operate, theft or loss of one key may cause theft of multiple hydraulic shovels that use the same authentication code, but the authentication code stored in each hydraulic shovel This can be prevented beforehand by changing. In the above configuration, preferably, the authentication code changing device includes an authentication code changing receiving means provided on the construction machine, which is always kept in a receivable state, and a radio wave generating means provided outside the construction machine. Upon receiving the radio wave for changing the code from the radio wave generating means, the receiving means for changing the authentication code supplies power to the control means to make it active, and changes the authentication code stored in the authentication code memory via the control means. It is configured to be. By changing the authentication code set on the construction machine side by radio waves using the radio wave generating means for outputting radio waves, the authentication code on the construction machine side can be changed by the remote method. In the above configuration,
A plurality of construction machines having authentication code change receiving means are prepared, and one radio wave generating means sends a code change radio wave to each of the plurality of authentication code change receiving means, and each of the plurality of construction machines All of the authentication codes stored in the authentication code memory are changed at the same time. Thus, the same authentication code set for each of the plurality of construction machines can be simultaneously changed to another code. Therefore, even if one of the keys of a plurality of construction machines is stolen, the construction machine is changed by collectively changing the authentication codes of the other construction machines having the same authentication code as the specific code of the key. Can be prevented from being stolen. In the above configuration, preferably, the authentication code memory of each of the plurality of construction machines is configured to store a plurality of authentication codes, and one radio wave generating unit is provided for each of the plurality of authentication code change receiving units. It is configured to transmit radio waves and simultaneously add or delete the authentication codes stored in the authentication code memories of the plurality of construction machines. It is preferable that the radio wave used in the radio wave generation means is a radio wave in a frequency range used for satellite communication. Further, a specific code changing device (code signal changing device) for changing a specific code stored in the key memory of the key by an external operation can be provided.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a typical embodiment of the present invention. In the figure, 11 is a battery, and 12 is a key switch for starting a vehicle engine. The battery 11 and the key switch 12 are provided on a vehicle of a construction machine. The key switch 12 has a mechanical switch structure (not shown) in which the key 13 is inserted and which is turned by turning operation of the key 13. This mechanical switch structure is a well-known ignition key cylinder. When the key 13 is inserted into the key insertion portion of the mechanical switch structure of the key switch 12 and the key 13 is rotated, each circuit is electrically connected by the contact 14. The battery side terminal of the contact 14 is connected to the + terminal of the battery 11, and an ON position and a START position are provided as connection terminals selected by turning the key 13. Key switch 1
At the two contact points 14, a power-on signal is output when connected to the ON position, and a starter signal is output when connected to the START position.

The key 13 has an electrically rewritable nonvolatile memory 15 (hereinafter referred to as "EEPROM 15").
And code signal output means 16 are incorporated. E
The EPROM 15 stores a specific code for identification. The code signal output means 16 outputs the EE under a predetermined condition.
The specific code stored in the PROM 15 is read,
Transmit by radio. That is, the code signal output means 16 outputs an airborne signal relating to the specific code.

The key switch 12 includes a trigger signal output means 17 which operates in conjunction with the code signal output means 16 incorporated in the key 13, and a receiving means 18. When the key 13 is inserted into the mechanical switch structure of the key switch 12 and the key 13 is set to the ON position of the contact 14, a power-on signal is output to the control device 19. The control device 19 is means for controlling the overall operation of the anti-theft device according to the present invention. Control device 19
Has a CPU, a ROM, a RAM, and the like, and is electrically rewritable.
PROM 20 ”). EEPROM2
In 0, an authentication code is stored in advance. The authentication code is a code having the same content as the specific code. When a specific code is given by radio waves from the key 13 side, the control device 19 compares / collates the specific code with an authentication code stored in the EEPROM 20, and determines whether the anti-theft function is enabled or disabled. .

When the control device 19 receives the power-on signal from the contact 14, the control device 19 operates the trigger signal output means 17 of the key switch 12 to generate a trigger signal for the key 13. The key 13 is a key switch 12
When a trigger signal is received from the EEPROM, a specific code is read from the EEPROM 15 and transmitted as a radio signal by the code signal output means 16. The specific code transmitted from the key 13 is input to the receiving device 18 via the antenna 21, and the specific code is modulated and input to the control device 19.

The control device 19 that has input the specific code is
The authentication code stored in the EPROM 20 is called and collated with the specific code. If the specific code and the authentication code match, the control device 19 turns on the battery relay 22 via the drive circuit to supply power to the vehicle body and cut off the starter signal cut relay 23 for cutting off the starter signal.
Is turned on, the starter motor is energized when the key 13 is at the START position of the contact point 14, and a hydraulic lock relay 24 for cutting off a hydraulic pressure source for operating with hydraulic pressure is turned on to be operable. Of the vehicle body can be operated. When the specific code and the authentication code do not match, the control device 19 keeps the battery relay 22, the starter signal cut relay 23, the hydraulic lock relay 24, and the like in an off state to keep the construction machine inoperable.

The receiving device 25 provided on the vehicle side is a device for receiving a radio wave from outside the construction machine and rewriting the authentication code stored in the EEPROM 20. The means for transmitting the radio wave for rewriting the authentication code is, for example, a code transmission device 35 shown in FIG. 3 described later. The receiving device 25 is always connected to the battery 11 and is supplied with power, and is always on standby to receive radio waves from outside. The receiving device 25 turns on the transistor 27 and inputs a power-on signal to the control device 19 when receiving a code including an authentication code having a predetermined content or a code to be changed, which is given from the outside, via the antenna 26. Then, the control device 19 is operated, and the received code is transferred to the control device 19. At this time, in the control device 19, the authentication code transferred from the receiving device 25 and the EEPROM
The authentication code stored in the EEPROM 20 is compared with the authentication code stored in the EEPROM 20, and when they match, the authentication code stored in the EEPROM 20 is electrically rewritten with the received change code. When the rewriting operation is completed, the construction machine cannot be operated even if the key 13 having the specific code before the rewriting is used. As described above, the authentication code changing device that changes the authentication code stored in the EEPROM 20 attached to the control device 19 of the construction machine by an external operation is provided by the receiving device 25 attached to the construction machine.
And a code transmission device 35 outside the construction machine.

FIG. 2 shows a code signal changing device 28 for changing a specific code for identification stored in the EEPROM 15 of the key 13. The key 13 is the code signal changing device 2
8 has a terminal 29 connectable to the terminal 8. When the key 13 is set on the mounting portion 30 of the code signal changing device 28, the terminal 29 is connected to the power supply 3 built in the code signal changing device 28.
1 and the code output means 32. Key 13
Is supplied with power from a power supply 31 via a terminal 29,
In addition, a new specific code is input from the code output unit 32. The change of the specific code is performed by the personal computer 33.
And the key 13 through the code output means 32
Is overwritten with the specific code of the EEPROM 15 in the.

By the above operation, the authentication code of the construction machine and the specific code of the key 13 can be rewritten.

FIG. 3 shows a code change operation for simultaneously and collectively changing the authentication codes stored in each of the plurality of construction machines. As described above, the code transmission device 35 for changing the authentication code is provided outside the construction machine. According to the code transmission device 35, the authentication codes stored in each of the plurality of construction machines can be changed collectively. As shown in FIG. 3, for example, for example, three hydraulic excavators 34A and 34 having the same authentication code
B and 34C are each provided with the anti-theft device according to the present invention shown in FIG. 1, and similarly store the same specific code corresponding to each of the hydraulic excavators 34A, 34B and 34C. Output keys 13A, 13B, 1
Suppose there is 3C. When the code is changed, a code including a predetermined content of an authentication code and a code to be changed is transmitted by a radio wave from a code transmitting device 35 that generates a radio wave.
Receiving the radio wave transmitted from the device, and changes the stored authentication code. Hydraulic excavators 34A, 34B, 3
If the authentication code in 4C is changed, the keys 13A, 13B, and 13C corresponding to each excavator cannot be used. Therefore, when the keys 13A, 13B, and 13C are overwritten with the specific code using the code signal changing device 28 so as to match the authentication code as described above, the hydraulic excavator 34
A, 34B and 34C are keys 13A, 13B and 1
It can also be used by 3C.

The above embodiment can be modified as follows. In the above-mentioned EEPROM 20, one authentication code is stored in advance as a premise, and this authentication code is stored in the control device 1 by the code transmitting device 35 and the receiving device 25.
Although the authentication code is changed to another authentication code via 9, a plurality of authentication codes can be stored in the EEPROM 20. In this case, a plurality of authentication codes are stored in advance in the EEPROM 20 of each of the plurality of construction machines, and thereafter, an authentication code is added.
It is also possible to configure to delete. Also in this case, one code transmission device 35 outside the construction machine
Thus, it is possible to simultaneously add or change a plurality of construction machines. When there are a plurality of authentication codes that can be stored in the EEPROM 20, a specific code different for each construction machine is used, a key having a new specific code is used depending on the construction machine, or a lost key is used. It is possible to delete a specific code.

As the frequency of the radio wave used in the code transmitting device 35, it is preferable to use a frequency included in a frequency band used in satellite communication.

A specific code stored in the EEPROM 15 built in the key 13 was changed using a code changing device 28 as shown in FIG. In this case, the key 13 is mounted on the mounting portion 30 of the code changing device 28, and a specific connection in the EEPROM 15 is changed by making an electrical connection. The specific code may be changed by using the above.

A numeric keypad is provided as a key 13 side, and a specific code is input using the numeric keypad.
It is also possible to provide a construction machine with a specific code. Further, instead of a structure in which the key 13 is inserted into the key switch 12, a ten-key is provided on the construction machine side without using a plug-in key, and a specific code may be given to the construction machine by operating the ten key. . Even in such a configuration, it is possible to adopt the above-described configuration in which the authentication codes on the construction machine side are simultaneously and collectively changed.

[0020]

As is apparent from the above description, the present invention has the following effects.

An authentication code changing device for changing the authentication code stored in the authentication code memory of the control means of the construction machine by an external operation is provided, so that when the key is stolen or duplicated, it is handled. By changing the authentication code given to the construction machine in advance by the authentication code changing device, the possibility of theft can be reduced, thereby increasing the security against theft.

One identification code given to the key is stored as an authentication code in each storage unit of a number of construction machines, all construction machines are started with the same key, and the number of construction machines is Since the authentication code given to each of them can be changed at once by the authentication code changing device, it is possible to handle a plurality of construction machines with a plurality of keys given the same specific code, and one key is stolen. If the construction code is copied or copied, the possibility that all other construction machines will be stolen will increase.However, the possibility of theft will be reduced by changing the authentication code given in advance with the authentication code changing device. can do. This can greatly increase security against theft.

Since the authentication code changing device can change the authentication code from outside using the radio wave of the satellite communication or the like, the authentication code can be changed even from a place away from the construction machine, and more than one construction machine can be changed at a time. Can be changed, and the change operation can be easily performed.

The authentication code memory provided in the construction machine is configured to be able to store a plurality of authentication codes, and the authentication code changing device is used to add and set an authentication code when a key having a new specific code is added. Since the authentication code related to the key specific code is deleted, the usability is further improved, and the possibility of theft can be reduced.

Further, since a code changing device for changing the specific code stored in the key memory of the key by an external operation is provided, the specific code on the key side can be easily changed with the change of the authentication code on the construction machine side. It can be changed and usability can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing an overall configuration of a construction machine antitheft device according to the present invention.

FIG. 2 is a configuration diagram of a code changing device that changes a specific code of a key.

FIG. 3 is a diagram showing a system configuration for simultaneously changing authentication codes stored in a plurality of construction machines. DESCRIPTION OF SYMBOLS 12 Key switch 13, 13A to 13C Key 14 Contact 15 EEPROM 16 Code output means 17 Trigger signal output means 18 Receiving means 19 Control device 20 EEPROM 25 Receiving device 26 Antenna 28 Code signal changing means 34A to 34C Hydraulic shovel 35 Code transmitting device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadatoshi Shimamura 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2E250 AA21 BB08 BB28 BB66 DD06 EE12 FF27 FF36 GG05 GG12 HH06 JJ05 KK03 LL00 TT04

Claims (6)

[Claims] 1. A key switch and control means provided on a construction machine, and a key mounted on the key switch, wherein the key switch generates a power-on signal when the mounted key is in an ON position. A switch means for outputting, a trigger signal output means for transmitting a trigger signal, and a receiving means for receiving an airborne signal, wherein the key is a key memory for storing a specific code in advance,
Code signal output means for reading the specific code stored in the key memory when the trigger signal is given and generating an airborne signal thereof, wherein the control means outputs a power-on signal from the switch means When the trigger signal output means outputs the trigger signal, the specific code signal received from the code signal output means of the key received by the receiving means is stored in an authentication code memory. In a construction machine anti-theft device configured to collate with a code and validate the power-on signal when they match, the authentication code stored in the authentication code memory of the control unit is An anti-theft device for a construction machine, comprising an authentication code changing device which is changed by an external operation. 2. The authentication code changing device comprises: an authentication code changing receiving means provided on the construction machine, which is always kept in a receivable state; and a radio wave generating means provided outside the construction machine. Upon receiving a code change radio wave from the radio wave generating means, the authentication code change receiving means supplies power to the control means to make it active, and is stored in the authentication code memory via the control means. The anti-theft device for a construction machine according to claim 1, wherein the authentication code is changed. 3. A plurality of construction machines having the authentication code change receiving means are provided, and one radio wave generating means transmits a code change radio wave to each of the plurality of authentication code change receiving means. 3. The method according to claim 2, wherein all of the authentication codes stored in the authentication code memory of each of the plurality of construction machines are simultaneously changed.
The anti-theft device for construction equipment according to the above. 4. The authentication code memory of each of the plurality of construction machines is configured to store a plurality of authentication codes, and each of the plurality of authentication code change receiving units is provided by a single radio wave generating unit. The anti-theft device for a construction machine according to claim 3, wherein a radio wave is transmitted to the plurality of construction machines to simultaneously add or delete an authentication code stored in the authentication code memory of each of the plurality of construction machines. 5. The construction machine according to claim 2, wherein a radio wave in a frequency band used for satellite communication is used as the radio wave used by said radio wave generation means. Anti-theft device. 6. The construction according to claim 1, further comprising a code changing device for changing the specific code stored in the key memory of the key by an external operation. Machine anti-theft device.