JPH0995208A - Vehicular theft prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a master key and reduce a burden to a user by setting a code number to a theft prevention control part and a medium which can be assembled in a trouble diagnoser and can input the code number by the trouble diagnoser. SOLUTION: A trouble diagnoser 26 is connected on thw way of a communication line 24 for connecting a theft prevention control device 12 with an engine control part 16. A code number set part 28 for setting a prescribed code number is installed in the theft prevention control part 12 and an exclusive medium (cartridge) 30 of the theft prevention control part 12 is assembled and a code number input part 32 which can input the code number is installed in the trouble diagnoser 26. Thereby, the theft prevention control part 12 carrys out the reset and registration of a key data, only when the set code number is matched with the code number inputted by the trouble diagnoser 26.

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 a vehicle, and more particularly to an antitheft device for a vehicle which can reduce the burden on the user and can be inexpensive.

[0002]

2. Description of the Related Art In a vehicle, a key may be illegally opened for the purpose of theft. Therefore, an antitheft device is provided to prevent theft due to unauthorized unlocking.

This anti-theft device is provided with, for example, an engine key to which an information code is set, and the engine key is provided with an information code output section (transponder) for receiving the power supply and outputting the information code. The anti-theft control unit (immobilizer controller) is provided to output the correct information code only when the information code input from the code output unit is correct, and the engine is operated only when the correct information code output from the anti-theft control unit is input. There is an engine control unit (engine controller) for starting the engine, and a fault diagnostic device (fault diagnostic tool) connected to a communication line between the anti-theft control unit and the engine control unit.

In such an anti-theft device, when the engine key, the anti-theft control unit and the engine control unit are re-registered in the market, that is, when the engine key is lost, a new engine key is used. When re-registration is required, a master key is set separately, and when this master key is inserted into the key groove, the anti-theft control unit and engine control unit are initialized and are ready for use. . The master key is different from the normal engine key, and when re-registering the anti-theft control unit or engine control unit with a new engine key, the anti-theft control unit using the engine key that has been used until now, Since it is necessary to erase the data of the engine control unit, it is used for initializing the anti-theft control unit and the engine control unit. This master key is usually stored by the user in order to prevent registration work by a third party.

Further, as such an antitheft device,
For example, JP-A-63-93649 and JP-A-6-2
It is disclosed in JP-A-70764 and JP-A-7-69173. In the one disclosed in Japanese Patent Laid-Open No. 63-93649, information for driving the engine is transmitted and received by magnetically coupling the annular core on the lock side and the lock core on the key side, and the information from the key side is transmitted. By making it possible to drive the engine only when it matches the information on the lock side, it becomes impossible to detect the information due to the adhesion of dust or to read the wrong information by operating the key The engine is reliably driven by the magnetic coupling between the core and the shaft-shaped core. JP-A-6-27
In the one described in Japanese Patent Publication No. 0764, a plurality of communication lines are provided between the key detection circuit and the engine control circuit, and the key detection circuit allows all the communication lines to be connected to the engine if all the communication lines from the key unit match the key code. A start permission signal is sent out, and the engine control circuit starts the engine if the engine start permission signal is input to any one of the communication lines.
When the communication line is disconnected in the engine control circuit, the time interval of the disconnection is measured to determine whether or not it is stolen. Japanese Patent Laid-Open No. 7-69173 discloses that when the key is inserted into the key cylinder, the ID code of the memory held in the key is read out, compared with the ID code of the memory on the vehicle side, and the agreement is obtained. When the keys match, the engine start permission state is set, and when the key rotates in the clockwise direction, that is, the starter direction, the permission signal is output only for a certain period of time to reduce the consumption of the vehicle battery. .

[0006]

However, in the conventional antitheft device, it is necessary to attach a master key in addition to the normal engine key, which is disadvantageous in that it is expensive.

Further, since the user has to store the master key, the user is burdened with the storage, and when the master key is lost, the antitheft control unit and the engine control unit cannot be used either. However, there is an inconvenience that the user's burden is increased in terms of cost.

Further, in the conventional antitheft device, parts such as an electric circuit have to be added separately, resulting in an inconvenience of increasing the number of parts and complicating the structure.

[0009]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an engine key to which an information code is set, and the engine key is supplied with power to provide the information code. An information code output section for outputting is provided, and an anti-theft control section is provided which outputs the correct information code only when the information code input from the information code output section is correct, and the correct information output from the anti-theft control section is provided. In the antitheft device for a vehicle, which is provided with an engine control unit for starting the engine only when a code is input, and a failure diagnostic device which is connected to a communication line between the antitheft control unit and the engine control unit. A predetermined secret code is set in the prevention control unit, and a mediator that can be incorporated in the fault diagnostic device and that can input the secret code in the fault diagnostic device is provided. Characterized in that was.

[0010]

According to the structure of the present invention, since the registration work can be performed only by inputting the personal identification code, the master key is unnecessary, the burden on the user is reduced, and the cost is reduced. The existing equipment can be used, the capital investment in the market is small, the configuration is simple, and the security is excellent.

[0011]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 3 show an embodiment of the present invention. 2 and 3, reference numeral 2 is a vehicle (not shown) antitheft device, and 4 is an engine key.

A predetermined information code is set in the information code setting section 6 of the engine key 4, and the information code of the information code setting section 6 is output in response to power supply by turning on the ignition (IG). An information code output unit (transponder) 8 for performing the operation is embedded.

The engine key 4 is inserted into a key groove (not shown) and communicates with a theft prevention control section (immobilizer controller) 12 via a coil unit 10 by a FIX (fixed) code 14. Information code output section 8
Is to start the operation by electromagnetic coupling when the coil unit 10 is energized.

The anti-theft control unit 12 inputs the information code from the information code output unit 8 and only when this information code is correct, this information code is turned on at the same time as the ignition is turned on and the engine control unit (engine controller) 16 is turned on. Is output to. This anti-theft control unit 1
A relay 18 is connected to 2.

The engine control unit 16 includes an ignition device 20.
The fuel injection device 22 is contacted, and the ignition device 20 and the fuel injection device 22 are operated so as to start the engine only when the correct information code is received from the anti-theft control unit 12. If the information code is not input within several seconds after the input of the ignition and the ignition is turned on, the ignition device 2 is provided so that the engine cannot be started.
0 or the fuel injection device 22 is deactivated or operated differently.

Anti-theft control unit 12 and engine control unit 16
Are in contact with each other via a communication line 24 composed of a rolling code.

A fault diagnostic device (fault diagnostic tool) 26 is connected in the middle of the communication line 24. The failure diagnostic device 26 is used when the information code setting unit 6, the anti-theft control unit 12, and the engine control unit 16 are replaced, and is also contacted to the relay 18.

As shown in FIG. 2, the anti-theft control unit 12 has a secret code setting unit 28 for setting a predetermined secret code.
Is provided. Further, the failure diagnostic device 26 is provided with a medium (cartridge) 30 dedicated to the anti-theft control unit 12.
It is provided so that it can be embedded and a personal identification code can be entered. For this reason, the failure diagnostic device 26 is provided with a personal identification code input unit 32.

As a result, the anti-theft control unit 12 can move to the next step only when the set secret code and the secret code input by the failure diagnostic device 26 match, that is, the previous secret secret code. Reset key data,
Register new key data, engine control unit 16
The data is registered in.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

In the antitheft control unit 12, the program starts (step 102) and the ignition is turned on (step 104). At the same time when the ignition is turned on, the engine control unit 16 normally operates the ignition device 20 and the fuel injection device 22.

Then, the fault diagnostic device 26 is connected to the communication line 24 (step 106), and when the personal identification code is input through the personal identification code input section 32 (step 108), the predetermined personal identification code set by the personal identification code setting section 28 is entered. It is determined whether or not the password and the password input by the password input unit 32 match (step 110).

If NO at step 110, the process returns to step 108.

On the other hand, if YES at step 110, it is possible to move (access) to the next step, for example, to reset the information code setting section 6 of the engine key 4 or
Register new key data, engine control unit 16
Data is registered (step 112).

As a result, it is not necessary for the user to store tools (tools) such as a master key, the burden on the user is reduced, and the cost can be reduced.

Moreover, since the existing failure diagnostic device 26 can be used, the capital investment in the market can be reduced.

Further, since the personal identification code is input to the failure diagnosing device 26, the security is excellent.

Furthermore, it is not necessary to add a component such as an electric circuit separately, the number of components can be reduced, and the structure can be simplified.

[0029]

As is apparent from the above detailed description, according to the present invention, a predetermined personal identification code can be set in the anti-theft control section, can be incorporated in the failure diagnostic device, and the personal identification code can be input in the failure diagnostic device. By providing an intermediary, the registration work can be performed simply by inputting the personal identification code, thus eliminating the need for a master key, reducing the burden on the user, and reducing the cost, as well as existing equipment. Can be used, there is little capital investment in the market, and
It is easy to configure and has excellent security.

[Brief description of drawings]

FIG. 1 is a flowchart of anti-theft control.

FIG. 2 is a main part configuration diagram of an anti-theft device.

FIG. 3 is an overall configuration diagram of an anti-theft device.

[Explanation of symbols]

 2 Anti-theft device 4 Engine key 6 Information code setting unit 8 Information code output unit 12 Anti-theft control unit 16 Engine control unit 26 Fault diagnostic device 28 PIN code setting unit 30 Mediator 32 PIN code input unit

Claims (2)

[Claims] 1. An engine key to which an information code is set is provided, and the engine key is provided with an information code output section for outputting the information code when supplied with power, and the information code input from the information code output section. Is provided with an anti-theft control unit that outputs the correct information code only, and an engine control unit that starts the engine only when the correct information code output from the anti-theft control unit is input is provided. In a vehicle anti-theft device equipped with a failure diagnostic device connected to a communication line between the prevention control unit and the engine control unit, a predetermined secret code can be set in the anti-theft control unit and incorporated into the failure diagnostic device. An antitheft device for a vehicle, characterized in that an intermediary body is provided which allows a personal identification code to be input to the failure diagnostic device. 2. The anti-theft control unit can shift to the next step only when the predetermined secret code set and the secret code input by the failure diagnostic device match. The anti-theft device for a vehicle according to claim 1.