JPH0592748A - Burglary and robbery prevention device for automobile - Google Patents

Abstract

PURPOSE:To prevent to unjustly start the engine of an automobile due to the use of a reproduced key or direct connection of wire. CONSTITUTION:A secret certification symbol is recorded on a magnet card 1 in which a plurality of permanent magnets 4 are embedded in a certain developing pattern, by combination of existence of the permanent magnet 4 on the magnetic record part position or the magnetic direction of the permanent magnet 4. Meanwhile, the secret certification symbol recorded on the magnet card 1 is read out with the magnetism detector 8 in a card reader 6 formed with a slit 7 for inserting the magnet card 1, mounted in the automobile, and compared with a previously set reference secret certification symbol with a comparator 12. When both coincide with each other, a coincidence signal is taken out from the comparator 12, and the electric circuit necessary for running of the automobile is controlled by the coincidence signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antitheft device for an automobile, and more particularly to an antitheft device for an automobile which can prevent the engine from being started by an illegal means such as a duplicated key or a direct connection of an electric wire.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. 1-3255.
Based on No. 50, we proposed a new anti-theft device for automobiles. This anti-theft device for an automobile embeds a plurality of permanent magnets in a key of an automobile, and assigns a specific identification code to the key by combining the magnetizing directions of these permanent magnets.

On the other hand, for example, a magnetic sensitive switch for detecting the magnetizing direction of the permanent magnet is incorporated in a cylinder lock for controlling a switch of a starter of an automobile, and when a key is inserted into a key hole of the cylinder lock, a group of permanent magnets. Read the identification code carried by the key, confirm that the inner cylinder of the cylinder lock has been turned with a key, and confirm that the key is a duplicate key of the cylinder lock, so to speak, duplicate the information carried by the key. It is configured that the starter is powered on for the first time after checking.

[0004]

The above-mentioned antitheft device for an automobile according to the above-mentioned proposal by the applicant of the present invention, of course, exhibits the intended function and sufficiently achieves its purpose.

However, since a device for reading the identification code carried by the permanent magnet group embedded in the key must be incorporated in the cylinder lock, in the case of a cylinder lock for an automobile designed for that purpose from the beginning, Anyway,
The existing cylinder lock for automobiles has a disadvantage that it is difficult to apply the invention of the above-mentioned applicant's previous proposal.

It is an object of the present invention to solve the above-mentioned inconvenience and to propose an antitheft device for an automobile, which can be easily applied to an existing automobile.

[0007]

In order to achieve the above object, the invention according to claim 1 has a plurality of magnetic recordings in which a permanent magnet is embedded in a plate-like substrate made of a non-magnetic material in a constant development pattern. Part is formed, the presence or absence of a magnet in each magnetic recording site, or a magnet card in which a personal identification code is recorded by a combination of the magnetizing directions of the permanent magnets embedded in each magnetic recording site, and it is mounted in the car. A card reader in which a plurality of magnetizers for detecting the magnetizing direction of the permanent magnets are attached to a portion aligned with the magnetic recording portion when the magnet card is inserted, and a personal identification code of the magnet card read by the card reader. A comparator that compares a preset reference secret code and outputs a match signal when both match,
An electric switch controlled by the comparator is provided, and an electric circuit essential for traveling of the automobile is controlled by the electric switch.

According to a second aspect of the present invention, a plurality of magnetic recording portions in which permanent magnets are embedded are formed in a plate-like substrate made of a non-magnetic material in a fixed development pattern and are arranged in parallel with each other. A plurality of magnetic recording rows provided, and a magnet card in which a personal identification code is recorded by combining the presence or absence of a magnet in each magnetic recording portion or the combination of the magnetizing directions of the permanent magnets embedded in each magnetic recording portion; A plurality of magnetizers that are mounted inside the card and that form a card slit into which the magnet card is inserted and that correspond to the magnetic recording portions of the magnetic recording row corresponding to one row of the magnetic card and that detect the magnetization direction of the permanent magnets. When a magnet is inserted into the card slit, a card reader for reading the personal identification code carried by the magnet for each porcelain recording row at a time interval and a signal carried in each porcelain recording row are temporarily provided. The memory to be stored, a comparator for comparing the personal identification code of the magnetic card read by the card reader with a preset reference personal identification code, and outputting a coincidence signal when the both coincide with each other, and is controlled by this comparator. And an electric switch for controlling an electric circuit which is indispensable for traveling of the automobile.

[0009]

According to the anti-theft device for an automobile according to the present invention having the above-mentioned constitution, the door of the automobile is opened to sit in the driver's seat, the magnet card is inserted into the slit of the card reader, and the starter is provided. A key of a cylinder lock for the switch lock (hereinafter, simply referred to as a cylinder lock) is inserted into a key hole of the cylinder lock and turned in a predetermined direction.

By inserting the magnet card into the slit of the card reader, each magnetic recording portion formed on the magnet card is aligned with the corresponding one of the plurality of magnetizers mounted in the card reader.

Then, each magnetizer is driven by the corresponding permanent magnet, and the presence or absence of the permanent magnet in each magnetic recording portion or the magnetization direction of the permanent magnet embedded in the magnetic recording portion is detected, and these permanent magnets are detected. The personal identification code of the magnet card recorded in the form of the combination of the embedding modes is read out.

This secret code is sent to a comparator and compared with a preset standard secret code. Here, the reference personal identification code is a code set on the magnet card that is set uniquely to the vehicle and is owned by a legitimate occupant of the vehicle.

When the personal identification code read from the magnet card matches the reference personal identification code, the comparator outputs a coincidence signal, and the electric switch controlled by the coincidence signal is an electric circuit indispensable for running the automobile. Is ready for operation.

The electric circuit indispensable for running this automobile is
For example, a starter circuit, an ignition circuit, a fuel pump control circuit, or a semiconductor integrated circuit which is the core of a comprehensive control device for an automobile using a microcomputer which has been widely adopted in recent years.

When a regular magnet card is inserted into the card reader as described above, the electric circuit indispensable to the running of the automobile is placed in an operable state, so that the key is inserted into the key hole of the cylinder lock. When this is rotated in a predetermined direction, the starter switch is closed, the starter motor is rotated, and the engine can be started.

However, when a non-genuine magnetic card is inserted into the card reader, or even a legitimate magnetic card is not inserted into the card reader, the electric switch controlled by the above-mentioned match signal. The electric circuit that is essential for driving the car does not work.
The engine cannot be started, or the vehicle cannot be driven even if the engine can be started.

For example, if this electric switch is connected in series with a starter of a car and a starter switch that is locked by a cylinder lock, a malicious third party who does not have a proper magnet card can obtain a proper one. Even if an attempt is made to turn the starter by unlocking the cylinder lock using a key, an electric switch controlled by the above-mentioned match signal is inserted between the starter switch controlled by the cylinder lock and the starter motor. Since it is open, the starter motor cannot be turned and therefore the engine cannot be started improperly.
This is the same when another magnet card that is not a regular magnet card is inserted into the card reader.

If an electric switch controlled by the match signal is inserted between the ignition coil and the igniter, for example, when a non-genuine magnetic card is inserted in the card reader, or the regular magnetic card is inserted. However, if this is not inserted into the card reader, the ignition circuit does not work and the engine cannot be started.

Furthermore, if an electric switch controlled by the above-mentioned match signal is inserted between, for example, the fuel pump and the power source, the fuel supply to the engine is cut off, so the engine is normally started. I can't.

According to the second aspect of the present invention, the personal identification code carried on the magnet card is read out by dividing it for each magnetic recording row and temporarily storing it in the memory.
The comparator is different only in comparison with a preset secret code, and the other points are the same as those in the invention described in claim 1 above, and therefore the detailed description will be omitted.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 indicates the entire magnet card. Magnet card 1 in the illustrated embodiment
Is a body plate 2 made of a non-magnetic material such as a plastic plate.
A plurality of rectangular recesses 3 and 3 (see FIG. 2) are formed in a fixed pattern on the magnetic recording medium, and these are used as magnetic recording sites. After the rectangular permanent magnets 4 are inserted into the recesses 3, the recesses 3 are formed. A cover sheet 5 such as a thin plastic sheet is attached to the surface of the main body plate 2 having an opening.

The permanent magnets 4 and 4 in the illustrated embodiment are
Two rows are provided along the insertion direction of the magnet card 1 into the card reader (longitudinal direction of the magnet card 1), four rows in each row, for a total of eight pieces.

Each of the eight permanent magnets 4 and 4 corresponds to the power of the binary coded code. In other words, each permanent magnet 4 corresponds to each digit of a binary number as a secret code. Therefore, the illustrated magnetic card 1 can make a maximum of 2 to the 8th power, that is, 256 kinds of card differences.

Each of the permanent magnets 4 is magnetized in the thickness direction (vertical direction in FIG. 2), and the surface on the cover sheet 5 side is N
The bit content of 0 or 1 of each digit is represented by the pole or the S pole.

On the other hand, as shown in FIG. 3, the card reader 6 for reading the personal identification code carried on the magnet card 1 is mounted at a place where it is easy to operate from the driver's seat of the automobile, for example, near the steering wheel. When the slit 7 into which 1 is inserted is opened to the driver side, it is easy to operate.

The card reader 6 is constructed as shown in FIGS. 4 and 5, for example. That is, the card reader 6
Is a flat box-like body with an opening of the slit 7 into which the magnet card 1 is inserted, and is located at a position aligned with the permanent magnets 4 and 4 when the magnet card 1 is fully inserted into the slit 7. Is provided with a magnetizer 8 such as a Hall IC.

The magnetic detector 8 in the illustrated embodiment employs a Hall IC in which a so-called Hall element for detecting the magnetization direction of the permanent magnet 4 is combined with an amplifier and a switching circuit made of a semiconductor integrated circuit. However, in some cases, a Hall element or a reed switch whose contacts are opened and closed by magnetism can be used.

The magnetometers 8 and 8 are, as shown in FIG.
The protective body 9 and the printed circuit board 11 are integrally combined and mounted on the card reader 6. These outputs are
As shown in FIG. 4, it is taken out as a password signal D having an 8-bit structure and supplied to a comparator described below.

As shown in FIG. 6, the 0th to 7th order secret code signals D0 to D7 forming the binarized secret code signal D are respectively converted into 0th to 7th order composing a comparator 12.
To the exclusive NOR gates 13-0 to 13-7.

On the other hand, as shown in FIG. 6, the 0th to 7th orders which are preset by a reference code generator (hereinafter simply referred to as a generator) 14 and constitute a binary coded reference code S. The respective secret identification signals S1 to S7 are supplied to the 0th to 7th exclusive NOR gates 13-0 to 13-7 constituting the comparator 12, respectively.

The reference secret code S is, for example, 8 bits for each of the eight dip switches 15 and 15, and
Or set it to the closed state and set it. In the embodiment shown in FIG. 6, the bit content of 1 is set by closing the dip switch 15. By the way, in the illustrated embodiment, the output of the detector 8 facing the N pole face is set to 1
And

The 0th to 7th dip switches 15-
Each of 0 to 15-7 corresponds to each of the 0th to 7th identification signals D0 to D7, and the output S-n of the dip switch of the same order and the identification signal D-n are the same exclusive NOR gate 13. Supply to -n.

The outputs of the 0th to 7th exclusive NOR gates 13-0 to 13-7 are supplied to the AND gate 16.
Are supplied in parallel to the AND gate 16 and a match signal C
Take out S. As is well known, the output of the exclusive NOR gate 13 becomes 1 when the same signal is applied, so that the coincidence signal CS is generated only when the secret identification signals of respective orders and the reference secretory signal all match. In other words,
The match signal CS is generated only when the code code recorded on the magnet card 1 and read by the card reader 6 matches the preset reference code code.

An electric circuit essential for traveling of the automobile is controlled via an electric switch which is opened / closed by the coincidence signal CS.

For example, as shown in FIG. 7, the matching signal CS from the comparator 12 is amplified to drive the electromagnetic coil of the first starter relay 17, and is inserted between the starter motor 18 and the battery 19 to lock the cylinder. The first starter relay 17 connected in series to the second starter relay 22 controlled by 21 is configured to be closed. With this configuration, even if the second starter relay 22 is closed by directly connecting the electric wire, the first starter relay 17 remains open unless the regular magnet card 1 is inserted into the card reader 17, The starter motor 18 does not rotate and therefore the engine does not start.

Further, as shown in FIG. 8, the matching signal C
An electric switch controlled by S is inserted in the ignition circuit between the ignition coil 23 and the igniter 24, for example.

With this configuration, if the magnet card 1 is not inserted in the card reader 6 or if the inserted magnet card 1 is not a proper one, the ignition circuit does not operate, and therefore the engine 25 starts. do not do.

In FIG. 8, reference numeral 26 is an ignition switch, 27 is an electromagnetic pickup, and 28 is an electromagnetic pickup.
Indicate the distributors, and the parts in FIG. 7 designated by the same reference numerals as those in FIG. 7 are equivalent to those in FIG.

Furthermore, an electric switch controlled by the coincidence signal CS is inserted between the fuel pump and the battery (not shown). Then, since fuel is not supplied to the engine, the engine will not start unless at least the regular magnet card is inserted into the card reader, and at least the vehicle cannot continue running.

In the above-mentioned invention according to claim 1, as shown in FIGS. 4 to 6, the secret codes carried by the permanent magnet groups 1 and 1 embedded in the magnet card 1 are permanent magnets. Are read in parallel by the same number of magnetic detector groups, in other words, at the same time, and are simultaneously supplied to the comparator 12.

However, the secret code recorded on the magnet card 1 can be read out for each magnetic recording line as in the invention described in claim 2. in this case,
In Fig. 1, four permanent magnets 4 in each row divided into left and right
The four magnetic detectors 8 and 8 corresponding to 4 are provided in the card reader 6, and the personal identification code carried on the magnet card 1 is read out at intervals of time for each magnetic recording row, and these are combined. And use the PIN code.

In this case, a strobe signal generator (not shown) for detecting the timing of matching between each magnetic recording train and the magnetic detector, and a memory (for temporarily storing the signal read from each magnetic recording train) ( Although not shown in the drawings) or the like is required, these can be easily designed by a person skilled in the art as necessary, and thus further detailed description will be omitted.

Further, in the magnet card in the illustrated embodiment, permanent magnets are tentatively packed in all the magnetic recording portions, each permanent magnet 4 carries a 1-bit information unit, and the permanent magnets 4 are set to 0 depending on the magnetization direction. It represents the bit content of one or one.

However, some Hall ICs can detect the presence or absence of magnetism in addition to the magnetizing direction. When using such Hall ICs, a dummy filling, which is not a permanent magnet, is buried in the magnetic recording portion. As a result, three states can be displayed in one magnetic recording portion, and the amount of information of the personal identification code carried on the magnet card can be increased accordingly.

Furthermore, although the comparator, generator and the like in the illustrated embodiment are made up of so-called concrete circuits, this may be software using a microcomputer or the like. Of course.

As is apparent from the above description, according to the present invention, a card reader is mounted in an automobile, and a standard personal identification code specific to the automobile is preset in the card reader. Assigns to the driver a magnet card carrying a secret code that should be the same as the above standard secret code, insert this magnet card into the card reader before starting the engine, and the secret code carried on the magnet card is the standard. It is verified whether it is the same as that of the one, and when the secret code of the magnetic card and the standard secret code set in the card reader match, a match signal is output, and an electric switch that opens and closes by this match signal, Since the electric circuit that is indispensable for running the car is controlled, it is possible to completely prevent the engine from being illegally started by copying the duplicated key or directly connecting the electric wire. Kill.

In addition, since the secret code in the magnet card is recorded in the form of the presence or absence of a permanent magnet or the direction of magnetization, it is external compared with a magnetic card such as a so-called telephone card or a bank CD card. The recording is stable without being affected by the magnetism, and an amplifier or the like is not required for reading the magnetism, which simplifies the structure of the card reader.

Furthermore, since it is not necessary to incorporate the card reader into the cylinder lock, various effects such as easy application of the present invention to existing automobiles can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a magnet card by breaking it.

FIG. 2 is a vertical cross-sectional view of a magnet card.

FIG. 3 is a perspective view showing a part of a driver's seat of an automobile.

FIG. 4 is a plan view of a card reader.

FIG. 5 is a vertical sectional view of the card reader, showing a state in which a magnet card is inserted.

FIG. 6 is a block diagram showing an example of the configuration of a comparator.

FIG. 7 is a diagram showing an embodiment of the present invention.

FIG. 8 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Magnet Card 4 Permanent Magnet 6 Card Reader 7 Slit 8 Magnifier 12 Comparator 13 Exclusive NOR Gate 14 Generator 21 Cylinder Lock D Personal Identification Signal S Standard Personal Identification Signal CS Consistency Signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02N 15/00 F 9149-3G

Claims (2)

[Claims] 1. A non-magnetic plate-shaped substrate is provided with a plurality of magnetic recording portions in which permanent magnets are embedded in a constant development pattern, and the presence or absence of magnets at each magnetic recording portion, or each magnetic recording portion. A permanent magnet attached to the magnetic card, which has a secret code recorded by a combination of the magnetizing directions of the permanent magnets embedded in the vehicle, and the permanent magnet attached to the magnetic recording part when the magnet card is inserted into the automobile and inserted. A card reader equipped with a plurality of magnetic field detectors for detecting the magnetic direction is compared with the personal identification code of the magnetic card read by the card reader and a preset reference personal identification code. It has an output comparator and an electric switch controlled by this comparator, and the electric switch controls an electric circuit indispensable for traveling of the automobile. Anti-theft device for car. 2. A plate-shaped substrate made of a non-magnetic material, in which a plurality of magnetic recording portions for embedding permanent magnets are formed in a fixed development pattern, and a plurality of magnetic recording rows arranged in parallel with each other are provided. , The presence or absence of a magnet in each magnetic recording portion, or the combination of the magnetizing directions of the permanent magnets embedded in each magnetic recording portion, and the magnetic card in which the personal identification code is recorded, and the magnetic card mounted in the automobile Along with forming a card slit to be inserted, a plurality of magnetizers that respectively detect the magnetization direction of the permanent magnets are provided corresponding to the magnetic recording portions of the magnetic recording row for one row of the magnet card, and the magnet is provided in the card slit. A card reader for reading out the personal identification code carried on each of the porcelain recording rows at a time interval when inserted,
A memory for temporarily storing the signal carried in each porcelain recording row, compares the secret code of the magnet card read by the card reader with a preset standard secret code,
It has a comparator that outputs a match signal when both match, and an electric switch that is controlled by this comparator, and this electric switch controls an electric circuit that is indispensable for running a vehicle. A featured anti-theft device for automobiles.