JPH0657524B2 - Vehicle theft prevention device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device, and more particularly to a device that prevents vehicle theft by using both mechanical key verification and electronic code verification.

<Prior Art> Conventionally, in order to start a vehicle engine, a key switch using a mechanical cylinder lock is required to prevent the vehicle from being stolen. However, since the key can be copied relatively easily, a sufficient antitheft effect has not necessarily been obtained.

Therefore, for example, in Japanese Unexamined Patent Publication (Kokai) No. 57-90237, after inserting a mechanical key into an ignition key switch and performing key verification, a signal having a unique electronic code set for each vehicle is sent from a portable transmitter. There is disclosed a vehicle anti-theft device that transmits to a side receiver, and the receiver can start a vehicle engine according to the result of the electronic code being compared with a regular code. According to this device,
The vehicle engine cannot be started simply by duplicating the key, and the theft of the vehicle is relatively reliably prevented.

However, if the owner of the vehicle loses or damages the mechanical key, it is possible to duplicate the key relatively early, but if the transmitter becomes unusable due to loss or failure, the unique code signal Since it requires a relatively long period to prepare a transmitter capable of transmitting the vehicle, there is a problem that the vehicle cannot be driven during that time.

Therefore, for example, Japanese Utility Model Laid-Open No. 57-8366 discloses a keyboard input means provided on the vehicle side so that an electronic code can be inputted as a personal identification number. However, when such a keyboard is simply installed. Had a problem that the PIN could be entered by trial and error.

<Problems to be Solved by the Invention> In view of the above-mentioned problems of the prior art, a main object of the present invention is to provide a vehicle antitheft device capable of surely preventing the vehicle theft and improving the handleability. To provide.

<Means for Solving Problems> According to the present invention, the object is to have means for collating an electronic code with a preset regular code and means for collating a mechanical key, A vehicle anti-theft device capable of starting a vehicle engine when both verification results match, wherein the electronic code verification means has a keyboard input means for inputting a personal identification code on the vehicle side. The present invention is achieved by providing a vehicle theft prevention device characterized in that the vehicle engine can be started only when both the mechanical key and the electronic code match within a predetermined time.

<Operation> In this way, the electronic code can be input to the vehicle side without using the transmitter, so that not only the handling property is improved, but also the antitheft effect for a person who does not know the personal identification number is improved. To do.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a vehicle antitheft device according to the present invention. This device includes a key switch unit 2 provided on a steering column or the like on the side of the vehicle 1 that also serves as a steering lock and an ignition switch, a control device 3 for controlling the start of an engine and an operation of an alarm means described later, and this control. It comprises a keyboard 4 which is connected to the device 3 and which is provided inside the vehicle compartment of the vehicle 1, and a key device 5 which is inserted into the key switch 2a provided in the key switch unit 2 so as to start the engine.

The key device 5 includes a key body 6 and a grip portion 7, and the grip portion 7 has a transmitter 8 built therein. A pair of light emitting elements 9 made of LED elements are provided in the gripping portion 7 facing the base end portion of the key body 6 so as to face each other, and the optical axis of the pair of light emitting elements 9 is oriented substantially in the direction of the tip of the key body 6. ing.
Further, a pair of contacts 10 are provided on the edge portion near the base end portion of the key body 6.

The key switch 2a provided on the key switch unit 2 on the vehicle 1 side is a well-known cylinder lock type, and the key body 6
And a pair of corresponding contacts 1 capable of contacting the above-described contact 10 and a mechanical contact that is closed according to the rotational position of the key device 5 while being inserted thereinto.
1 and are provided. Also, the key switch unit 2
Is provided with a light emitting element 12 composed of a phototransistor facing one light emitting element 9 of the key body 6 inserted in the key switch 2a. The corresponding contact 11 and the light receiving element 12 are connected to the control device 3 described above.

FIG. 2 is a block diagram schematically showing the configuration of the vehicle antitheft device according to the present invention.

The light emitting element 9 provided on the grip portion 7 of the key device 5 is connected to the light emitting circuit 13 which is a part of the transmitter 8. The light emitting circuit 13 is connected to a CPU 14 that stores a unique regular code set for each vehicle, and a trigger circuit 15 is connected to the CPU 14. The contact circuit 17 connected to the contact 10 and the rechargeable battery 16 is connected to the trigger circuit 15.

The control device 3 provided on the vehicle 1 side is provided therein with a light receiving circuit 20 connected to the light receiving element 12, and the light receiving circuit 20 stores a CPU 21 that stores the same code as the above-mentioned unique code for each vehicle. It is connected to the.

The CPU 21 is connected to the keyboard 4 provided with numeric keys, the relay control output circuit 22 and the alarm generation circuit 23. The relay control output circuit 22 drives and controls the engine ignition device and the fuel injection device.
0 is connected to a main relay 32 for supplying power from the vehicle-mounted battery 31 and a starter relay 34 for enabling the starter motor 33 of the engine. The alarm generation circuit 23 is connected to the horn 35 and the headlight 36 via the alarm signal output circuit 24.
Further, the alarm generation circuit 23 includes a sensor 37 that detects that the key switch 2a is in the “ON” position described later, a sensor 38 that detects that power is being supplied to the engine control device 30, and a starter motor 33. It is connected via an input circuit 25 to a sensor 39 that detects that power is being supplied to the.

The charging control circuit 26 connected to the vehicle-mounted battery 31 is connected to the corresponding contact 11 in the key switch 2a, and when the contact is connected to the contact 10, the battery 16 can be charged via the contact circuit 17. It is like this.

Key switches 2a are "LOCK", "ACC", "O"
It can be set to each position of "N" and "ST", and when set to the "ON" position, the main relay 32
Power is supplied from the in-vehicle battery 31 to the
When the position is set to the "ST" position, power is supplied to the main relay 32 and the starter relay 34.

In the engine control device 30, when the main relay 32 is turned on and the key switch 2a is set to the "ON" position, power is supplied from the vehicle-mounted battery 31. In the starter motor 33, the starter relay 34 is turned on and the key switch 2a is "ON".
Power is supplied from the vehicle-mounted battery 31 via the magnet switch 40 when the position is set to the “ST” position.

Next, the operation of the vehicle theft prevention device described above will be described in detail.

First, when the key body 6 is inserted into the key switch 2a and the contact 10 and the corresponding contact 11 are brought into contact with each other, a signal for confirming this contact is sent from the contact circuit 17 to the trigger circuit 15. Then, the CPU 14 generates a unique code signal based on a command from the trigger circuit 15, and transmits an infrared code signal to the light receiving element 12 via the light emitting circuit 13 and the light emitting element 9. From the light receiving element 12 to the light receiving circuit 2
When this code signal is transmitted to the CPU 21 of the control device 3 via 0, the CPU 21 performs collation of a proper regular code.

At this time, for example, when the code signal is not transmitted to the CPU 21 due to a failure of the key device 5 side, the driver inputs a preset personal identification number into the keyboard 4, converts it into a unique code using the keyboard, and transmits it to the CPU 21. It is possible to do. In this case, if the personal identification number is not input to the keyboard 4 within a predetermined time which may be, for example, 30 seconds before and after inserting the key body 6 into the key switch 2a, C
The PU 21 is set so as not to accept a personal identification number, that is, a unique code input from the keyboard 4. If an incorrect personal identification number is input to the keyboard 4 a predetermined number of times, which may be, for example, three times, the CPU will wait until a predetermined time elapses.
Reference numeral 21 is set so as not to accept the input of the unique code from the keyboard 4.

When the unique codes are collated and it is confirmed that they match, the main relay 32 and the starter relay 34 are turned on via the relay control output circuit 22, and the vehicle-mounted battery 31 causes the engine control device 30 and the starter motor 33 to operate. Power can be supplied. When an alarm generation prohibition command is issued to the alarm generation circuit 23, the key device 5 is rotated, and the key switch 2a is set to the "ST" position through the "ON" position, the engine is actually started. To do. After that, the vehicle 1 can be operated normally such as until the key switch 2a reaches the "LOCK" position. Here, the alarm generation circuit 23 always detects the sensors 37 to 39 when the CPU 21 does not issue an alarm generation prohibition command.
An alarm can be generated by a signal from.

In addition, especially when the personal identification number is input from the keyboard 4,
Since the CPU 21 is set so that the code matching result is valid, for example, 30 seconds after the function of the vehicle 1 is stopped, that is, after the key switch 2a is in the “LOCK” position, the key switch 2a is set to “LOCK”. When the engine is restarted immediately after the position is reached, it is not necessary to repeatedly input the personal identification number on the keyboard 4.

On the other hand, if the CPU 21 does not confirm that the unique codes match, that is, if a code different from the unique code is entered, or if the code is not entered from either the key device 5 or the keyboard 4, an alarm is issued. Generation circuit 23
Is still able to generate an alarm, and the relay control output circuit 22 does not receive a command to turn on both relays 32 and 34, so that the engine control device 30 and the starter motor 33 cannot be driven. At this time, if the key switch 2a is set to the "ON" position, the sensor 37 causes the input circuit 2 to move.
A signal is input to the alarm generating circuit 23 via the alarm generating circuit 23, and the alarm generating circuit outputs the signal to the horn 35 via the alarm signal output circuit 24.
Also, the headlight 36 is driven to generate an alarm.

Also, a key is not inserted into the key switch 2a, and for example, as shown by a broken line A in FIG. 2, power is directly supplied to the engine control device 30 and the starter motor 33 without passing through the relays 32 and 34. Sensor 38
Alternatively, a signal is input from 39 to the alarm generation circuit 23 via the sensor input circuit 25, and an alarm is generated as described above.

In this way, when the vehicle 1 is not driven by using the duplicate key that does not have the circuit for transmitting the above-mentioned code signal, power is not supplied to the engine control device 30 and the starter 34, and the engine is not started. It will be impossible and the alarm will continue to be generated. In addition, the engine control device 3
0 and the starter motor 33 are directly connected to each other to connect the wires to drive the vehicle, the alarm continues to be issued.

If the keyboard and transmitter are used together and the engine can be started by matching the electronic code input to the vehicle from either the keyboard or transmitter, the transmitter will be lost or damaged. Allows you to enter an electronic code from the keyboard even if
There is no need to make the vehicle inoperable.

Needless to say, the present invention is not limited to the above-mentioned embodiment and various applications are possible. For example, although the transmitter and the keyboard are used together in this embodiment, only the keyboard may be used as the electronic code input means. Further, in the present embodiment, the power is supplied from the battery 16 on the key device 5 side to each circuit in the transmitter 8. However, by inserting the key body 6 into the key switch 2a, the battery 8 from the vehicle-mounted battery 31 to the transmitter 8. Power may be supplied. Further, as an auxiliary transmission means on the transmitter 8 side, the key device 5
A push button switch connected to the trigger circuit 15 may be provided on the surface of the grip portion 7, and a structure for transmitting a code signal by turning on the switch may be provided.

<Effects of the Invention> As described above, according to the present invention, the vehicle can be surely prevented from being stolen, and the transmitter is not essential. Therefore, the handling of the vehicle theft prevention device that performs electronic code matching is not only improved. However, the effect is extremely large because the anti-theft effect for a person who tries to steal by entering the personal identification number by trial and error is improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a state in which a key device of a vehicle antitheft device according to the present invention is inserted in a key switch. FIG. 2 is a block diagram showing the structure of a vehicle theft prevention device according to the present invention. 1 ... Vehicle, 2 ... Key switch unit 2a ... Key switch, 3 ... Control device 4 ... Keyboard, 5 ... Key device 6 ... Key body, 7 ... Gripping portion 8 ... Transmitter, 9 ...... Light emitting element 10 ...... Contact, 11 ...... Corresponding contact 12 ...... Light receiving element, 13 ...... Light emitting circuit 14 ...... CPU, 15 ...... Trigger circuit 16 ...... Battery, 17 ...... Contact circuit 20 ...... Light receiving circuit , 21 ... CPU 22 ... relay control output circuit, 23 ... alarm generation circuit 24 ... alarm signal output circuit 25 ... input circuit, 26 ... charging control circuit 30 ... engine control device 31 ... vehicle battery, 32 ... Main relay 33 ... Starter motor, 34 ... Starter relay 35 ... Horn, 36 ... Headlight 37-39 ... Sensor, 40 ... Magnet switch

Front Page Continuation (72) Inventor Kazuhiro Sakata 3700 Wadayama, Shimonaka, Sadohara-cho, Miyazaki-gun, Miyazaki Prefecture Honda Locks Co., Ltd. (56) References JP 62-88644 (JP, A) 57-8366 (JP, U)

Claims (3)

[Claims] 1. A means for collating an electronic code with a preset regular code and a means for collating a mechanical key, wherein the vehicle engine can be started when both collation results match. A vehicle theft prevention device, wherein the electronic code collating means has keyboard input means for inputting a personal identification code on the vehicle side, and both the mechanical key and the electronic code match within a predetermined time. A vehicle theft prevention device, wherein the vehicle engine can be started only occasionally. 2. The invention according to claim 1, wherein the starting of the vehicle engine after a lapse of a predetermined time from the stopping of the vehicle engine requires the coincidence of both the mechanical key and the electronic code. The vehicle antitheft device according to item 1. 3. A vehicle engine starting before the lapse of the predetermined time after the vehicle engine is stopped does not necessarily require adaptation of both the mechanical key and the electronic code. The vehicle antitheft device according to claim 2.