JP2000233719A - Vehicular theft preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release an engine lock by outputting a driving permiting signal to a relay when preset identification codes of both coincide with each other when a noncontact IC card or an IC tag carried by a vehicle driver approaches and communicates in an electromagnetic field generated by a fixed station arranged in a vehicle. SOLUTION: When a vehicle driver approaches a vehicle 40 by carrying an IC card 1, the IC card enters an electromagnetic field range made by a fixed station 2, so that an electric current is generated. This is used as a power source by a regulator 13. An identification code transmitted by the fixed station 2 is received by a transmission/reception antenna 11 to be sent to a control circuit 15. The control circuit 15 receives the power source from the regulator 13, reads the identification code written in an EEPROM 18, checks up with the identification code of the fixed station 2, and sends back a response signal to the fixed station 2 when both coincide with each other. The response signal is received by a transmission/reception antenna 21 to output a driving permitting signal to a relay 20. Thus, a starter motor 6 can be driven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device having a fixed station capable of communicating with a non-contact IC card or an ID tag in an area where the vehicle can communicate.

[0002]

2. Description of the Related Art Conventional vehicle theft is frequent and troubles vehicle users. Key theft often, for example,
Excavators and other construction equipment (hereinafter referred to as construction equipment) have only a few keys of the same type, so that an unspecified number of people can ride on the site. Therefore, he notices that there are only a few types of malicious people trying to steal these construction machines, and obtains those keys to commit the crime. Once a vehicle is stolen, especially the construction machine itself is larger and more expensive than a general vehicle such as a passenger car, hinders work, and suffers enormous damage. In recent antitheft devices, various methods have been developed for locking the vehicle not only at the key but also at other parts. A typical example uses a password, and unless a valid password is entered using a numeric keypad, no current flows from the power supply and the starter motor does not operate even when the engine key is turned, so that the engine does not start. (See, for example, Japanese Unexamined Utility Model Publication No. 6-85156.) However, a thief has also found an escape route skillfully from these devices and continues to steal as usual. Therefore, more advanced anti-theft technology is being researched and developed. For example, devices have been developed that do not require special attention to the driver. Memorizing the specific person's system, habits, preferences, etc. of the specific person driving the vehicle, the specific person's pupil movement, the specific person's voice, and the specific person's fingerprint, and the specific person approaches the vehicle and just trains It is a structure to release the lock.

On the other hand, as a practical anti-theft device for construction equipment, there is a structure in which a password is input wirelessly from a place away from the vehicle. (See, for example, Japanese Patent Application Laid-Open No. 9-48324.) This is a hydraulic machine antitheft device E that does not impair the ability to prevent theft and can easily resume the operation even when the operation of the hydraulic machine is repeatedly started and stopped frequently. As shown in FIG. 7, the antitheft device E includes a wireless receiver 62, and a wireless transmitter 61 that wirelessly transmits a password and a lock button signal to the wireless receiver 62. When a password or a signal of the lock button 61 c is wirelessly input to 62, the wireless receiver 62 transmits those signals to the unlocking electronic device 58. The wireless transmitter 61 stores a password, and when the vehicle driver presses one button 61b, the stored password is transmitted to the wireless receiver 62 wirelessly. In the figure, 61
a is a transmitting antenna, 62a is a receiving antenna, 55 is an engine, 56 is a starter motor, 57 is a starter switch, 58 is an unlocking electronic device, 59 is an auto lock switch, 60 is a key switch start relay, and 65 is a solenoid valve. , 70 indicate a battery, and the solenoid valve 65 is connected to a hydraulic machine 69 that operates a hydraulic pump.

The anti-theft device E operates the unlocking electronic device 58 and the solenoid valve 65 wirelessly via the antennas 61a and 62a by pressing a button or a lock button 61b of the transmitter 61, thereby unlocking the unlocking electronic device. When the device 58 outputs the unlocking signal, the solenoid drive of the solenoid valve 65 is energized, and the spool (not shown) of the solenoid valve 65 is moved to the open position, the primary pipe 69 is brought into a conductive state, and finally the hydraulic pressure is increased. Move the machine. Conversely, if the unlocking electronic device 58 does not output the unlocking signal, the spool of the solenoid valve 65 is closed, the primary pressure pipe 69 is shut off, and finally the hydraulic machine cannot be operated.

[0005]

Except for a general anti-theft device for setting a personal identification number using a numeric keypad, the former technique is sophisticated, expensive and unprofitable, and is not suitable for general vehicles and construction equipment. Difficult to be adopted. Also, the latter anti-theft device E
Is convenient because the vehicle driver only needs to carry the wireless transmitter 61 in which the personal identification number is stored without having to remember the personal identification number. Although the device is small, there is a problem that a device for input is required and the device is bulky.

[0006] The present invention has been made in view of the above, and the engine lock is released when a proprietary user approaches an automobile with an IC card or ID tag without having to input a personal identification number. An object of the present invention is to provide an anti-theft device that enables a normal engine start and to provide a device that emphasizes economy.

[0007]

In order to achieve the above object, a vehicle antitheft device according to the present invention is provided in a non-contact vehicle carried by a vehicle driver on a vehicle provided with a traveling drive device and a vehicle mounted device. A fixed station that communicates with an IC card or an ID tag in a communicable area, a relay that is provided in the traveling drive device and the vehicle-mounted device and controls opening and closing of a power supply to the traveling drive device and the vehicle-mounted device, and a fixed station that is generated. A non-contact IC card or ID tag comes close to the electromagnetic field, and the control means is provided in a fixed station that communicates and outputs a drive permission signal to a relay when the preset identification codes of the two coincide with each other.

[0008] The vehicle is a construction machine.

[0009] The traveling drive device is a starter motor, and a relay is provided on the minus ground wire of the starter motor.

A line between the engine key switch and the other connection terminals among the lines of the connection terminals for connecting the starter motor to the traveling drive device and connecting the relay to the magnet switch section via the connection terminal of the starter motor and the engine key switch. Provided.

The traveling drive device is a starter motor, and the relay is provided on a conductive portion between a conductive end of a magnet switch portion of the starter motor and a brush of the motor portion.

According to the anti-theft device of the present invention, a relay is provided in a line between the device and the power supply so as to prevent power supply to at least one of a driving device for moving the vehicle and a device mounted on the vehicle. At the same time as turning off the engine so that it does not operate, cut off the power to the relay, and when approaching the vehicle again, provide an IC card or ID tag that automatically turns on the power of the relay by wireless communication, and the engine is in the normal state It works with. Therefore, even if the thief has the key, the engine lock is not released. In addition, the engine lock is released only by the person approaching the vehicle, and the engine is started by turning the key as usual.

[0013] Wireless communication uses an identification code (secret code) issued by a fixed station (parent side) installed on the instrument of the vehicle and a non-contact IC card or ID tag (child side) carried by the vehicle driver. By matching the electromagnetic wave of the code, the drive signal is sent to the relay installed in the device, the current is obtained from the power supply, the anti-theft protection of the device is released and the vehicle can run. Non-contact IC card or ID tag (child side) is small and thin,
It does not have a power supply, generates power by receiving electromagnetic waves from a fixed station, and emits a specially set identification code into the air as electromagnetic waves. The fixed station (parent side) installed in the vehicle transmits and receives the same electromagnetic wave with the identification code of the contactless card,
When the signals match, a drive permission signal is sent to the relay. The power supply of the fixed station is taken in from a power supply provided in the fixed station itself or a power supply of the vehicle via a switch.

The traveling drive device and the vehicle-mounted device of the vehicle according to the present invention include an engine key switch and a starter motor of a traveling device for a general vehicle, an engine key switch, a traveling motor, a starter motor, an engine cut solenoid for a construction machine, An unload lever, a running unload, and the like are included. Most of these traveling driving devices and on-vehicle devices have a structure that operates by receiving power from a vehicle battery.

The vehicle antitheft device of the present invention supplies power to each device or to a line (lead wire) to the device so as to cut off the power from the battery for the vehicle and not to operate the driving device or the device mounted on the vehicle. A relay is provided to control the opening and closing of the power supply.

The vehicle is provided with a fixed station, a power source is provided from a power source provided in the fixed station or a power source of the vehicle via a switch, an electromagnetic field is generated from the fixed station, and a non-contact area provided in a communicable area is provided. Communication with an IC card or ID tag is possible.

The fixed station has a control unit as built-in control means. The fixed section checks the identification code of the non-contact IC card or ID tag against the identification code of the fixed station, and when it is determined that the base station is compatible, a relay is provided. When the engine is turned on when the engine key switch is inserted into the start contact of the starter motor using the key, and the engine is determined to be incompatible, no drive permission signal is output to the relay. The engine does not start even if it is placed in the motor start contact.

An IC card is a compact, thin plastic card having a microcomputer and an IC memory built in and attached to a person. The ID tag is a personal accessory such as a bag, a button, a badge, etc., attached to a person or an article. I
The internal configuration of the C card and the ID tag is the same, and the description is omitted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a general vehicle anti-theft device A in which a traveling drive device according to the present invention is provided with a relay on the minus side of a starter motor will be described in detail with reference to FIGS. explain.

The non-contact IC card or ID tag is provided in the non-contact IC card 1, the fixed station 2 is provided in the instrument 10, the traveling drive device is provided in the vehicle starter motor 6, and the relay 20 is provided in the minus ground wire 50a of the starter motor 6. This will be described below as an example. A starter motor 6 has a small cylindrical magnet switch 6a, a large cylindrical motor 6b,
And a clutch section 6c. A relay 20 that operates with a non-contact card is provided in the middle of the ground wire 50a where the field coil 50 of the motor unit 6b is grounded to the body. The magnet switch section 6a includes a plunger 35.
And a pull-in coil 48 wound around a shaft 38 of the plunger 35, a holding coil 49, a movable contact 36, and fixed contacts 37a and 37b. The power supply 30 and the connection terminal 33 are connected via a line 47, and the connection terminal 33 and the connection terminal 32 are connected via a line 46 having the engine key switch 31 and the like in between.
Is connected to the brush 44 of the motor section 6b via a conductive section 45. The connection terminal 32 is a conductor 4
2 is connected to the magnet switch section 6a. or,
The conductive end 34 having the fixed contact 37b at its end is connected to the brush 44 of the motor section 6b via a conductive section 45. The motor section 6b includes a yoke, a field coil, an armature, a brush, a commutator, and a shaft. The current is grounded from the motor section 6b via the field coil 50 to the vehicle body. The relay 20 is provided on the minus ground wire 50 a of the starter motor 6. Reference numeral 19 denotes a power switch to the fixed station 2, which may be operated manually or automatically turned on when the engine key switch 31 is turned off. In the figure, reference numeral 39 denotes a conductor for supplying a current from the power supply 30 to the relay 20. still,
If the fixed station 2 has its own power supply, the conducting wire 39 is unnecessary.

The contactless IC card 1 includes a transmitting / receiving antenna 1
1, a rectifier circuit 12 for converting alternating current to direct current, a regulator 13 for generating power, a low-pass filter 14 for extracting signals in the range of the identification code, and responding when the transmission signal is matched with a preset ID code and matched. A control circuit 15, an EEPROM 18 that stores only a preset identification code and cannot rewrite data, and a control circuit 15.
And a power supply driver 16 that radiates a signal to the electromagnetic field via the transmitting / receiving antenna 11.

The fixed station 2 is fixed in a vehicle 40 where communication is possible, in a position where others cannot easily operate from outside, for example, in the instrument 10. The fixed station 2 is covered with a strong cover (not shown) so as not to be destroyed.
The fixed station 2 includes a transmitting / receiving antenna 21 for performing communication in a non-contact state with the outside, a band-pass filter 24 for passing only a specific frequency, that is, an identification code, a demodulation circuit 25 for extracting information on an electromagnetic wave, and an input. Control means for outputting a signal for driving the relay 20 provided in the traveling device when the electronic code by the means is collated with the specific information for collation set in advance as input information and the collation result is determined to be appropriate. A control circuit 26, a memory 28 for recording data, a modulation circuit 23 for carrying information on electromagnetic waves, an overdriver 22, and a unique power supply 29 or power switch 19 for supplying power to each device are provided. And a power supply 30 of a vehicle 40 connected to the vehicle, and connected so as to send a drive signal from the control circuit 26 to the relay 20 of the traveling device.

The operation of the anti-theft device A of this embodiment will be described. When the engine key switch 31 of the vehicle 40 is turned off,
Power cannot be obtained from power supply 30, and vehicle 40 stops. The relay 20 turns off automatically. The relay 20 is connected to the fixed station 2 by the identification code from the non-contact IC card 1.
When the driving signal is not transmitted from the fixed station 2 to the relay 20, it does not operate. When the power switch 19 is turned on after the engine of the vehicle 40 is turned off, the power supply 30 of the vehicle
Alternatively, in the case of the power supply 29 provided in the fixed station 2, a weak current of 5 to 6 V for operating the IC of the fixed station 2 is automatically supplied to the fixed station 2, and the vehicle 40 is stopped, A predetermined electromagnetic field is generated via the transmitting / receiving antenna 21 and an identification code assigned to the fixed station 2 is constantly transmitted. The power switch 19 is the engine key switch 3
In the structure linked with 1, the value is automatically input. The communicable area of the electromagnetic field is about 1 meter. The user is ready to communicate with the non-contact IC card 1 at any time.

In this state, even if a thief attempts to steal the vehicle 40 and turns on the engine by turning on the engine key switch 31 using a key obtained without an IC card or an ID tag, the relay 20 of the ground line 50a is used. Is off,
The electric circuit of the starter motor 6 is not formed, no current flows from the vehicle battery 30, and the starter motor 6 is not driven. In addition, the thief does not notice that there is a modification on the minus side of the starter motor 6. Therefore, the engine does not start.

Even if the thief uses another IC card,
Since the electromagnetic wave of the unique code transmitted from the fixed station 2 does not match the identification number of the IC card, the control unit 26 of the fixed station 2 does not react, and the relay 20 remains off. Therefore, the engine does not start. After all, where does the thief operate?
It is determined whether the engine will be started or not, and the vehicle 40 will be given up and will be sent out.

Next, the operation of the engine will be described.
When the vehicle driver carries the IC card 1 and approaches the vehicle 40, the vehicle driver enters the electromagnetic field range created by the fixed station 2 installed in the vehicle interior, the electromagnetic wave acts on the coil of the non-contact IC card 1, The coil is induced into a resonance state to generate a current. The rectifier circuit 12 converts the alternating current into direct current, and a regulator 13 generates a power supply with a constant voltage.
This power is sent to the control circuit 15. The identification code constantly transmitted from the transmitting / receiving antenna 21 of the fixed station 2 is received by the transmitting / receiving antenna 11 of the non-contact IC card 1 and sent to the control circuit 15. The control circuit 15 receives the power from the regulator 13, reads the identification code (child side) written in the EEPROM 18, compares it with the identification code of the fixed station 2 (parent side), and when they match, the demodulation circuit 17. Transmitting / receiving antenna 11 via driver 16
Thus, a response signal is returned to the fixed station 2.

The fixed station 2 receives the response signal from the IC card by the transmission / reception antenna 21, takes it into the memory 28 via the band pass filter 24, the demodulation circuit 25, and the controller 26, and uses the true non-contact IC card. After confirming that there is, the control circuit 26, which is the control unit of the fixed station 2, outputs a drive permission signal to the relay 20 of the ground line 50a,
0 is opened, power is supplied from the power supply 30 of the vehicle 40,
The starter motor 6 can be driven. That is, the engine can be started. Accordingly, when the vehicle driver enters the cabin and turns on the engine key switch 31 as usual using a key, the starter motor 6 is driven to start the engine. When the engine is started, the power supply from the power supply 30 or 29 of the fixed station 2 is cut off, and no identification signal is transmitted.

FIG. 3 shows an anti-theft device B for the starter motor 6, in which the relay 20a is connected to the connection terminal 3 of the starter motor 6.
This is a structure provided in the line 46 between the engine key switch 31 and the other connection terminals 32 among the lines 46 of the connection terminal 32 connected to the magnet switch section 6a via the 3 and the engine key switch 31. The current flow is the same as that of the first embodiment. When the relay 20a is open, no circuit is formed even when the engine key switch 31 is turned on.
No current flows from the starter motor, and thus the starter motor does not operate. The structure and operation of the IC card or ID tag 1 and the fixed station 2 are the same as those in the first embodiment and will not be described.

FIG. 4 shows an anti-theft device C for the starter motor 6, which has a structure in which the relay 20b is provided on a conductive portion 45 between the conductive end 34 of the magnet portion 6a of the starter motor 6 and the brush 44 of the motor portion 6b. is there. Current flow, IC
The structure and operation of the card or ID tag 1 and the fixed station 2 are the same as in the first embodiment, and a description thereof will be omitted.

FIG. 5 shows a modification of the anti-theft device A for the starter motor 6, in which two connection terminals 32, 3 are added to the first embodiment.
3, a terminal cover 52 is provided. The terminal cover 52 is connected to the connection terminal 3 on one end face of the magnet switch.
The inner and outer layers are made of a solid material, and the inner layer is made of an insulating material. In addition, the wiring to the connection terminals is formed by molding the inner surface of the terminal cover 52 into a wiring shape so that the wirings cannot be connected to each other (direct connection). The inside of the terminal cover 52 is solid. Attachment and detachment of the terminal cover 52 are designed to be impossible for ordinary users. The provision of such an integral terminal cover 52 can be achieved by directly connecting the two connection terminals 32 and 33 with separate conductors, without connecting the power source via the line 57 to the power source 30, the line 56 and the connection. The current flows through the terminal 33, the conducting wire, and the connection terminal 32, and the engine may be started. Therefore, the two connection terminals 32, 33 cannot be directly connected. Current flow, IC card or ID tag 1 and fixed station 2
The structure and operation are the same as in the first embodiment, and a description thereof will be omitted.

A relay 20 similar to the above may be provided on the line to the other driving devices and on-vehicle devices, and an anti-theft device for turning on and off the power from the power source 30 may be provided.

Next, when the anti-theft device D of the present invention is applied to the construction machine 4, each device for mounting a relay is shown in FIG.
This will be described with reference to FIG. The starter motor 6 has been described for the general vehicle 3 and will not be described.

[0033] The engine cut solenoid 8 is interposed in a fuel supply pipe system connecting the fuel tank and the engine.
During normal operation, the valve opens to enable fuel supply, but when it is determined that fuel supply is unnecessary, that is, when stopping running, the valve is closed by receiving a fuel supply stop signal and fuel is cut. I do. A relay is provided in a power supply unit that opens and closes a valve of the fuel supply pipe.

The unload lever 7 is a safety lever for preventing accidents. When the unload lever 7 is lowered, the boom 5 and the hydraulic system can be operated. Therefore, when the unload lever 7 is raised, the hydraulic system does not operate. A lock mechanism for locking the lever in the raised state is provided, and a relay is provided in the lock mechanism. If the relay is not turned on, power cannot be obtained from the power supply.

The traveling unload 8 sends a hydraulic pressure to the traveling motor 9 to drive the traveling motor 9, and the supply of hydraulic pressure is controlled by a solenoid. A relay is provided on the solenoid wiring to activate and deactivate the solenoid.

In the above description, the relay 20 of the fixed station 2 for the non-contact IC card 1 has been described as an example of a vehicle device, but is not limited to one. It may be provided in each device, and a plurality of fixed stations 2 may be operated simultaneously.

The communication means of the IC card or ID tag may be not only radio waves but also light such as electromagnetic coupling and infrared rays.

[0038]

According to the present invention having the above configuration, the following effects can be obtained.

Since the non-contact IC card and ID tag are used for unlocking the anti-theft device, the trouble of setting the security code using the numeric keypad every time in the related art and deterioration of the code reading performance due to wear of the contact IC card. Disappears.

The contactless IC card or ID tag is compact and can be easily carried by a vehicle driver.

A fixed station is set up in an unknown place in the vehicle cabin,
The very existence of the anti-theft device can be hidden from the thief.

Since the vehicle driver carries the IC card or ID tag and approaches the vehicle in which the fixed station is installed, the anti-theft device is released. Forgetting the security code using the numeric keypad and hitting the security code. Worries such as incorrect arrangement order of time are eliminated.

When the terminal cover is covered with the connection terminal of the starter motor in addition to the anti-theft device A, double theft is prevented, and the thief has to clear the double barrier, which takes more than double the time and theft The effect of giving up is great.

Since only a relay is provided at a portion connected to a power supply of a vehicle driving device and a vehicle-mounted device, and a fixed station is provided in a vehicle cabin, it is economical without requiring a conventional advanced device.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing communication between a non-contact card or ID tag of the present invention and a fixed station in a general vehicle.

FIG. 2 is a schematic explanatory view in which a traveling drive device is a starter motor and a relay is provided on a ground wire.

FIG. 3 is a schematic explanatory view in which a traveling drive device is a starter motor and a relay is provided in a line connecting an engine key switch and a connection terminal.

FIG. 4 is a schematic explanatory view in which a traveling drive device is a starter motor, and a relay is provided in a conductive portion between a conductive end portion of a magnet switch portion and a brush of a motor portion.

FIG. 5 is a schematic explanatory view showing a modified example of FIG. 1 in which a relay is provided at a minus portion of a starter motor, and a terminal cover is further provided at a connection terminal.

FIG. 6 is an explanatory diagram when a fixed station, a traveling drive device, and a vehicle-mounted device are applied to a power shovel of an industrial vehicle.

FIG. 7 is a system configuration diagram of a conventional hydraulic machine that communicates with a wireless transmitter and a wireless receiver.

[Explanation of symbols]

 A, B, C, D Anti-theft device 1 Non-contact IC card, ID tag 2 Fixed station 6 Starter motor 6a Magnet switch unit 6b Motor unit 6c Clutch unit 10 Instrument 11 Transmission / reception antenna (IC card side) 12 Rectifier circuit 13 Regulator 14 Low-pass filter 15 Control circuit 16 Driver 17 Demodulation circuit 18 EEPROM 19 Power switch 20, 20a, 20b Relay 21 Transmission / reception antenna (fixed station side) 22 Overdriver 23 Modulation circuit 24 Band-pass filter 25 Demodulation circuit 26 Control circuit 28 Memory 29 Power supply (fixed station side) 30 Power supply (vehicle) 31 Engine key switch 32, 33 Connection terminal 34 Conductive end 44 Brush 45 Conductive part 46, 47 Line 50 Field coil 50a Ground wire 52 Terminal cover

Claims (6)

[Claims] 1. A fixed station that communicates with a non-contact IC card or ID tag carried by a vehicle driver in a communicable area with a vehicle including a traveling driving device and a vehicle-mounted device, a traveling driving device, and a vehicle. A relay provided on the on-board equipment and controlling the opening and closing of the power supply to the traveling drive equipment and the on-vehicle equipment, and a non-contact IC card or ID tag approaching in the electromagnetic field generated by the fixed station, and communicate with each other in advance. A vehicle anti-theft device comprising: a control unit provided in a fixed station that outputs a drive permission signal to a relay when the set identification codes match. 2. The vehicle anti-theft device according to claim 1, wherein the vehicle is a construction machine. 3. The travel driving device is a starter motor,
3. The anti-theft device for a vehicle according to claim 1, wherein the relay is provided on a negative ground line of the starter motor. 4. The traveling drive device is a starter motor,
2. The relay according to claim 1, wherein the relay is provided on a line between the engine key switch and another connection terminal among lines of a connection terminal connected to the magnet switch section via the connection terminal of the starter motor and the engine key switch. Or the vehicle antitheft device according to claim 2. 5. A travel driving device is a starter motor,
3. The vehicle anti-theft device according to claim 1, wherein the relay is provided on a conductive portion between a conductive end portion of a magnet switch portion of the starter motor and a brush of the motor portion. 6. The vehicle antitheft device according to claim 4, wherein each connection terminal of the starter motor is covered with a robust terminal cover.