JP2002308052A - Theft prevention device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the crime-prevention by holding a locked state even when a key cylinder is wrongly operated. SOLUTION: This theft prevention device 1 for a vehicle is provided with a key 3, signal reading means 5, and a signal processing means 7. The key 3 can be inserted into a door 11, a trunk 13, and key cylinders 11a, 13a, 15a of an ignition in common, and a transmitting means 17 is buried in the key 3 to transmit the inherent information for enquiry. The signal reading means 5 are respectively mounted near the key cylinders 11a, 13a, 15a and receive signals transmitted form the transmitting means 17. The signal processing means 7 is electrically connected to each signal reading means 5, and sends an unlocking permission signal to the door 11 and the trunk 13, and a start permission signal to the ignition under a condition that the signal transmitted from the signal reading means 5 is agreed with the registration information registered in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle anti-theft device for preventing a vehicle from being stolen due to an illegal operation of a key cylinder.

[0002]

2. Description of the Related Art As one of devices for preventing theft of a car, a device (product name: immobilizer) which starts after exchanging authority with a key and an engine control circuit is known.
In an automobile equipped with this immobilizer, a correct key registered in advance is not inserted into a key cylinder, and if the key (signal) does not match, the engine does not start (or an alarm sounds).

Therefore, according to the automobile equipped with the immobilizer, there is an advantage that the effect of preventing the start of the direct connection to the cell after the key prying is great.

[0004]

In recent years, crimes called so-called picking in which a key cylinder is illegally operated by using a special tool have frequently occurred. Also, in the car equipped with the above-mentioned immobilizer, pry open the trunk, remove the key cylinder, open the passenger seat door with a duplicate key produced based on the extracted key cylinder,
It has been reported that the in-vehicle computer at the foot of the passenger seat was replaced with another computer, the engine was started, and the car was taken away. Therefore, if the duplicate key is forged, for example, by removing the key cylinder, there is a problem that the theft prevention cannot be prevented even in a vehicle equipped with this kind of immobilizer.

[0005] The present invention has been made in view of the above-described circumstances, and can be used to lock a key cylinder even if the key cylinder is tampered with by means such as picking, or if the key cylinder is tampered with a forged key. Provide a vehicle anti-theft device whose state is maintained,
The purpose is to improve the crime prevention of vehicle theft.

[0006]

In order to achieve the above object, a vehicle anti-theft device according to the first aspect of the present invention is inserted commonly into key cylinders of a door, a trunk and an ignition of a vehicle, and is used for inquiry. Transmitting means for transmitting specific information for use as a signal, a signal reading means for receiving the signal transmitted from the transmitting means, disposed near each of the key cylinders, The unlocking signal for the door and the trunk and the ignition are provided on condition that the signal sent from the signal reading unit and the registered information match in advance. And a signal processing means for sending a start permission signal to the controller.

In the vehicle antitheft device according to the first aspect,
For example, even if the door key cylinder is unlocked by an illegal method such as picking, an inquiry signal is not obtained from the transmission means, and an unlock permission signal is not transmitted from the signal processing means. For this reason, for example, in the case of a door or trunk,
The lock device is held in the locked state, and the door or trunk cannot be opened. Similarly, if the inquiry signal from the transmitting means is not obtained, the start permission signal is not transmitted, so that power is not supplied to the ignition coil and the engine cannot be started. Thus, even if the key cylinder is illegally operated by means such as picking or the key is forged, the locked state is maintained, and the security against vehicle theft is improved.

According to a second aspect of the present invention, the key cylinders of the door and the trunk are connected to respective lock devices through a connecting mechanism, and the key cylinder is unlocked through the connecting mechanism by an unlocking operation. 2. The vehicle anti-theft device according to claim 1, wherein a movement restricting means for restricting a movement of the connecting mechanism is attached to the connecting mechanism, and the signal when the key is inserted into the key cylinder. On the condition that the signal from the reading unit matches registered information registered in advance, the signal processing unit sends a movement restriction canceling signal to the movement restriction unit.

In the vehicle anti-theft device according to the second aspect,
When a key is inserted into a key cylinder of a door or a trunk, a signal transmitted from the key is received by a signal reading unit, and the signal is input to a signal processing unit. The signal processing means sends a movement restriction release signal to the movement restriction means on condition that the input signal matches registered information registered in advance. Therefore, if the signal reading means does not receive the signal from the key or the signal received by the signal processing means does not match the registration information, the movement of the connecting mechanism is restricted by the movement restricting means, and the locking device is locked. Doors and trunks are not opened.

According to a third aspect of the present invention, in the vehicle anti-theft device of the first aspect, the signal from the signal reading means when the key is inserted into the key cylinder of the door and the pre-registered signal are transmitted. The registration information and the signal from the signal reading means when the key is inserted into the key cylinder of the ignition,
The signal processing means sends a start permission signal on condition that the registered information matches the registered information.

In the vehicle anti-theft device according to the third aspect,
When the key is inserted into the key cylinder of the door, a signal from the key is received by the signal reading means, and the received signal is sent to the signal processing means. Next, when the key is inserted into the key cylinder of the ignition, a signal from this key is sent to a signal processing means from a signal reading means provided in the vicinity of the key cylinder. Then, the signal processing means matches the signal when the key is inserted into the key cylinder of the door with the registration information registered in advance, and the signal when the key is inserted into the key cylinder of the ignition. Only when the registered information matches, the start permission signal is transmitted to the ignition coil. Therefore, a double inquiry is made,
Security is further improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a vehicle antitheft device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing a vehicle anti-theft system according to the present invention, FIG. 2 is a block diagram of the vehicle anti-theft system shown in FIG. 1, and FIG. , Key cylinder and signal reading means, enlarged perspective view, FIG.
FIG. 2 is a front view of a partially cutaway automobile door showing a coupling mechanism provided with a movement restricting means.

A vehicle antitheft device 1 according to the present embodiment.
Has a key 3, a signal reading means 5, a signal processing means 7, and a movement restricting means 9 as its main components. The key 3, which is commonly used for the key cylinders 11a, 13a and 15a of the door 11, the trunk 13 and the ignition 15, has a transmitting means 17 called a tag embedded therein.

The signal reading means 5 is disposed near the key cylinders 11a, 13a, 15a of the door 11, the trunk 13, and the ignition 15, respectively, and a coil 21 is wound around the ferrite core 19 as shown in FIG. It is configured as a transmitting and receiving antenna.

In this embodiment, the signal processing means 7
Is divided by an integration unit 23 and an electronic control circuit 25. The signal reading means 5 is electrically and integrally connected to an integrated unit 23 installed at an arbitrary position on the vehicle. In addition, the integration unit 23
It is connected to the electronic control circuit 25 and transmits and receives signals to and from the electronic control circuit 25. For the integrated unit 23 and the electronic control circuit 25, a computer having a CPU and a memory is used.

In the integration unit 23, the same information as the inquiry specific information transmitted from the transmission means 17 is stored in the memory as electronic information in advance. This registration information,
For example, the key 3 and the key cylinders 11a, 13a, 1
The relationship with 5a is registered at the time of factory shipment of the vehicle specified. The integration unit 23 has a function of inquiring the information based on the signal input from the signal reading means 5 and the registered information, and sends the result of the determination of the match or mismatch to the electronic control circuit 25 as a determination signal. It has become.

The signal processing means 7 may be one in which the integrated unit 23 and the electronic control circuit 25 are integrally formed, and in this case, a computer having a CPU and a memory can be used. .

In the present embodiment, the signal reading means 5 is controlled by the control signal sent from the electronic control circuit 25 to be in the vicinity of the key cylinders 11a, 13a, 15a.
A magnetic region is formed. When the key 3 enters the magnetic area, the transmitting means 17 incorporated in the key 3 detects the signal from the signal reading means 5 and transmits the signal of the unique information stored therein, and the signal reading means 5 is returned.

That is, the magnetic signal transmitted from the signal reading means 5 gives an output necessary for the signal transmission of the transmitting means 17. Therefore, the key 3 does not require a power source for signal transmission.

The integration unit 23 receives the signal transmitted from the key 3 in this manner, determines whether registered information registered in advance matches the unique information based on the received signal, and performs electronic control. A determination signal is sent to the circuit 25. Thereby, it is determined whether the key 3 inserted into the key cylinders 11a, 13a, 15a is genuine.

When the electronic control circuit 25 receives the determination signal indicating that the received information from the integrated unit 23 matches the registered information, the electronic control circuit 25 transmits an unlock permission signal for the door 11 and the trunk 13 and a start permission signal for the ignition 15. The internal circuit is formed as follows.

In this embodiment, the door 11,
Each key cylinder 11a, 13 of the trunk 13
a is connected to each locking device 29 via the connecting mechanism 27.
It is connected to the. That is, as shown in FIG. 4, the door inner panel 31 of the vehicle is provided with an inside handle 33 at the front and a lock device 29 at the rear, and the inside handle 33 is opened via the handle rod 35 to open the lock device 29. It is connected to a lever 39.

A lock knob 41 is provided above the inside handle 33 and is connected via a lock rod 45 to a knob lever 43 associated with a locking lever (not shown) of the lock device 29. With this mechanism, when the inside handle 33 is operated, the open lever 39 is rotated via the handle rod 35, and the door 11 and the trunk 13 can be opened. Also,
By operating the lock knob 41, the lock rod 4
By rotating a locking lever (not shown) through 5,
The lock device 29 can be brought into an unlocked state.

The movement restricting means 9 is disposed near the lock rod 45, which is a component of the connecting mechanism 27. The movement restricting means 9 receives an unlocking permission signal from the electronic control circuit 25. By doing so, the lock rod 45
The restriction on the movement of the is released. As the movement restricting means 9, for example, a solenoid that releases the engagement of the plunger 9a with the lock rod 45 by inputting an unlock permission signal can be used.

Next, the operation of the vehicle antitheft device 1 configured as described above will be described. FIG. 5 is a flowchart showing an operation procedure of the vehicle antitheft device according to the present invention.

The key cylinders 11a, 13a, 15a of the door 11, the trunk 13, or the ignition 15
When the key 3 is inserted (st1), the signal reading means 5
Receives the signal from the key 3 (st3). When the signal reading means 5 receives the signal from the key 3, the integration unit 23 determines whether or not the received signal matches the registration signal. (St5).

This determination signal is sent from the integration unit 23 to the electronic control circuit 25 (st7). When a determination signal indicating that the reception information matches the registration information is input from the integration unit 23 (st9), the electronic control circuit 25 performs
A release permission signal and a start permission signal are sent to the movement restricting means 9 or the ignition 15 (st11).

The key cylinders 11a, 13a, 1
If 5a does not receive the signal from the key 3, it determines it in st3, and the permission signal is not transmitted (st1).
3). In this case, an alarm transmission process may be performed (st15).

Therefore, according to the vehicle anti-theft device 1, even if the key cylinder 11a of the door 11 is unlocked by an illegal method such as picking, the inquiry signal from the transmitting means 17 is not obtained, and the signal is not transmitted. The unlocking permission signal is not sent from the processing means 7. Therefore, the movement restricting means 9
Is in a state where the movement of the lock rod 45 is restricted,
The lock device 29 holds the locked state, and the door 11 cannot be opened. Similarly, if the inquiry signal from the key 3 is not obtained, the engine cannot be started because the start permission signal is not sent to the ignition 15.

Next, the vehicle antitheft device 1 according to the present invention.
Another embodiment will be described. FIG. 6 is a flowchart showing the operation procedure of another embodiment of the vehicle antitheft device according to the present invention.

In this embodiment, the signal from the signal reading means 5 when the key 3 is inserted into the key cylinder 11a of the door 11 matches the registered information registered in advance, and the key cylinder of the ignition 15 The signal processing means 7 sends out a start permission signal on condition that a signal from the signal reading means 5 when the key 3 is inserted into the key 15a matches registered information registered in advance.

In the vehicle antitheft device according to this embodiment, when the key 3 is inserted into the key cylinder 15a of the ignition 15 (st17), the signal reading means 5
Receives the signal from the key 3 (st19). When the signal reading means 5 receives the signal from the key 3, the integration unit 23 determines whether or not the received signal matches the registration signal. (St21).

This determination signal is sent from the integration unit 23 to the electronic control circuit 25 (st23). The electronic control circuit 25 receives the determination signal indicating that the received information matches the registered information from the integration unit 23 (st2).
5) Immediately before that, it is determined whether or not the reception information of the key 3 inserted into the door key cylinder 11a and the registration information match (st27).

If the received information in the door key cylinder 11a matches the registered information, a start permission signal is sent from the electronic control circuit 25 to the ignition 15 (st29). In st19,
Key cylinder 15a without receiving signal from key 3
Is operated, or when the received information and the registered information do not match in st25 and st27, the start permission signal is not transmitted (st31). Also in this case, similarly to the above-described embodiment, a process of transmitting an alarm (st33) may be performed.

In this embodiment, a process for determining whether or not the received information of the key 3 inserted into the door key cylinder 11a and the registered information match immediately before is performed.
Although the case where the processing is performed by the electronic control circuit 25 has been described as an example, this processing may be performed by the integration unit 23.

According to the vehicle antitheft device, the door 1
When the key 3 is inserted into one key cylinder 11a, a signal from the key 3 is received by the signal reading means 5, and the received signal is sent to the signal processing means 7. Next, when the key 3 is inserted into the key cylinder 15a of the ignition 15, this key cylinder 15a
From the signal reading means 5 provided near the
Is sent to the signal processing means 7. Then, the signal processing means 7 determines that the signal when the key 3 is inserted into the key cylinder 11 a of the door 11 matches the pre-registered information, and that the key 3 is inserted into the key cylinder 15 a of the ignition 15. A start permission signal is sent to an ignition coil or the like only when the signal at the time of the match and the registered information registered in advance match. Therefore, a double inquiry is made, and the security can be further improved.

The signal reading means 5 has been described as forming a magnetic area.
May have only a function of receiving a signal from the key 3. In this case, the key 3 is provided with a power source such as a small battery. According to such a configuration, the signal output transmitted from the key 3 can be increased. In addition, the circuit configuration of the signal processing means 7 can be simplified as compared with the case of the above embodiment.

[0039]

As described above in detail, the vehicle antitheft device according to the present invention has a key in which a transmitting means for transmitting unique information is embedded, and a key disposed near the key cylinder and transmitted from the transmitting means. Signal reading means for receiving a signal to be transmitted, and signal processing for sending an unlocking permission signal or a start permission signal on condition that the signal sent from the signal reading means matches registered information registered in advance. Means, for example, even if the key cylinder of the door is unlocked by an illegal method such as picking, the inquiry signal is not obtained from the transmitting means, and the unlocking permission signal is not sent from the signal processing means. The lock device keeps the locked state and the door cannot be opened. Similarly, if the inquiry signal from the transmitting means is not obtained, the engine cannot be started because the start permission signal is not sent. As a result, even when the key cylinder is tampered with, the locked state can be maintained, and the security against vehicle theft can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an on-vehicle situation of a vehicle antitheft device according to the present invention.

FIG. 2 is a block diagram of the vehicle anti-theft device shown in FIG. 1;

FIG. 3 is an enlarged perspective view of a key, a key cylinder, and signal reading means shown in FIG. 2;

FIG. 4 is a front view of a partially cutaway automobile door showing a coupling mechanism provided with a movement restricting means.

FIG. 5 is a flowchart showing an operation procedure of the vehicle anti-theft device according to the present invention;

FIG. 6 is a flowchart showing an operation procedure of another embodiment of the vehicle antitheft device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vehicle anti-theft device, 3 ... Key, 5 ... Signal reading means, 7 ... Signal processing means, 9 ... Movement restriction means, 11a,
13a, 15a: key cylinder, 13: trunk, 1
5: ignition, 17: transmitting means, 27: coupling mechanism, 29: locking device.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E250 AA21 BB08 BB66 CC10 DD06 FF23 FF26 FF27 FF36 HH01 JJ05 KK03 LL00 LL01 LL14 NN04 PP00 PP15 QQ00 UU02 VV00

Claims (3)

[Claims] 1. A key which is inserted in common into each key cylinder of a door, a trunk and an ignition of a vehicle, and has a transmitting means embedded therein for transmitting specific information for inquiry as a signal, and in the vicinity of each of said key cylinders. A signal reading unit disposed to receive the signal transmitted from the transmitting unit; and the signal transmitted from the signal reading unit electrically connected to each of the signal reading units; A vehicle antitheft device comprising: signal processing means for transmitting an unlock permission signal for the door and the trunk and a start permission signal for the ignition on condition that the registration information matches. 2. The key cylinder of each of the door and the trunk is connected to a respective locking device via a connecting mechanism, and the locking device is released via the connecting mechanism by an unlocking operation of the key cylinder. The vehicle antitheft device according to claim 1, wherein a movement restricting means for restricting the movement of the connecting mechanism is attached to the connecting mechanism, and the signal from the signal reading means when the key is inserted into the key cylinder. A vehicle anti-theft device characterized in that the signal processing means sends a movement restriction release signal to the movement restriction means, on condition that the signal matches registered information registered in advance. 3. The signal from the signal reading means when the key is inserted into the key cylinder of the door, and the registration information registered in advance match, and the key cylinder is inserted into the key cylinder of the ignition. The signal processing means sends out a start permission signal on condition that the signal from the signal reading means at the time of insertion is coincident with the registered information registered in advance. 2. The vehicle antitheft device according to 1.