JP2966297B2 - Vehicle anti-theft device - Google Patents

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, and more particularly to a vehicle anti-theft device which is capable of starting an engine on condition that an ID code registered in an engine key matches an ID code registered in a vehicle. Vehicle anti-theft device.

[0002]

2. Description of the Related Art While various proposals have been made to prevent theft of vehicles such as automobiles, when an attempt is made to start or run a vehicle using an incorrect key, the vehicle is mechanically or electrically driven. Prohibition of starting and running (immobilize)
There are things that I try to do. For this purpose, an identification code, that is, an ID code is built in the key, and when the key is inserted into the key cylinder to start the vehicle, the ID code built in the key is read and the reference ID stored in the vehicle is stored in advance. The engine is enabled by generating a permission signal only when the codes match with each other and when the codes match.

[0003] In this case, if the permission signal is a binary signal of ON / OFF, there is a possibility that the theft may be performed due to mechanical destruction or improper wiring. Therefore, it has been proposed to code the permission signal. (For example, “Automotive Technology” 19
1994, Vol. 48, No. 8, pp. 59-64).

FIG. 3 shows an example of such a conventional transponder type immobilizer. Key 2
Has a memory (not shown) in which a key ID code (for example, 64 bits) is stored in advance, and a transmitter 4 for transmitting the key ID code. The transmitter 4 of the key 2 and the key cylinder 5 are connected by, for example, an induction coil (antenna) 6.

When the key 2 is inserted into the key cylinder 5 and turned to the ignition position, the ignition switch 7 is closed. In response, the immobilizer CPU 13 built in the immobilizer unit 30 operates,
Power is supplied from the power amplifier 11 of the immobilizer ECU 10 to the transmitter 4 via the coil (antenna) 6.
In response, the transmitter 4 reads the key ID code and transmits it to the key cylinder 5 side.

[0006] The received key ID code is digitized by an R / F (high frequency) circuit 12 in the immobilizer 10 and read into the CPU 13 to store an appropriate ID therein.
It is temporarily stored in the code register 13B. In the EEPROM 13A of the CPU 13, a unique reference ID code assigned to each vehicle is stored in advance.
The code and the read key ID code are compared and collated by the collation function unit 13S of the CPU 13. If it is determined that they match or have a predetermined relationship, the permission code is sent from the matching function unit 13S to the engine E.
It is transmitted to the CU 16. At the same time, the starter relay is energized and the starter motor (both not shown) starts rotating. When the engine ECU 16 determines and confirms the reception of the permission code, the engine ECU 16 sets the fuel injection valve 1
7, the various drive / control means such as the fuel pump 18 and the ignition control unit 20 are controlled in accordance with a predetermined procedure and timing so that the vehicle can be started and run.

On the other hand, the reference ID code stored in the EEPROM 13A and the key I transmitted and read from the key 2 are read.
When the D code does not match or does not have a predetermined relationship, the matching function unit 13S does not send out the permission code. Therefore, the start of the vehicle by the engine ECU 16 is prohibited, and the alarm device 14 is activated by the CPU 13 to provide an appropriate alarm and display. In this way, unauthorized starting and running of the engine by an unauthorized key are prevented, and vehicle theft is reliably prevented.

[0008]

The functions of the transponder-type immobilizer described above to prevent unauthorized starting and running of the engine are very effective in a region where theft is frequent or a vehicle destined for a country. It is not preferable to install it on the vehicle because it imposes a cost burden on the user for unnecessary equipment. Therefore, even if the vehicle types are exactly the same, a vehicle with the anti-theft function and a vehicle without the anti-theft function are produced in parallel depending on the destination.

FIG. 4 is a diagram showing a configuration of a main part of a vehicle to which the anti-theft function is not added. As apparent from comparison with FIG. 3, the transmitter 4 of the key 2 and the key cylinder 5
The immobilizer ECU 10 is removed in the immobilizer unit 30 '.

On the other hand, for convenience in production or management,
The engine ECU 16 is common regardless of whether the anti-theft function is added or not, and the immobilizer CPU 13
Is not installed, the signal level of the permission code input terminal of the engine ECU 16 is pulled up or down to a predetermined value to determine whether or not to execute the processing related to the permission code.

The electrical connection between the immobilizer unit 30, the induction coil 6, the ignition switch 7, the fuel injection valve 17, the fuel pump 18, and the ignition control unit 20 is maintained by a pair of connectors. ing.
In FIG. 3, the illustration of the connector main body is omitted, and only the pin numbers are represented by circled numbers.

Therefore, a malicious third party illegally obtains the immobilizer unit 30 'without the anti-theft function, replaces it with the immobilizer unit 30 with the anti-theft function, and connects both the connectors. If they are fitted, there is a problem that the vehicle is stolen.

It is an object of the present invention to provide a vehicle anti-theft device which solves the above-mentioned problems of the prior art and makes it difficult to replace an electronic circuit unit relating to an anti-theft function.

[0014]

In order to achieve the above object, according to the present invention, an input ID code is compared and collated with a reference ID code stored in advance in a vehicle body, and both are set in advance. An engine control means for enabling the engine to start when it is in a relationship, various drive / control means controlled by the engine control means, provided on each signal line of the engine control means and various drive / control means, respectively. A vehicle anti-theft device comprising a pair of connector means which are fitted to each other and electrically connect the respective means, is characterized in that the following means are further provided. (1) The shape of the fitting portion between the pair of connector means is a specific shape according to the configuration of the engine control means. (2) The connection relationship between each electrical contact and each signal line in the pair of connector means is a specific relationship according to the configuration of the engine control means.

[0015]

According to the above configuration (1), the electrical connection between the engine control means and the various drive / control means is performed via the connector means having a specific shape according to the configuration of the engine control means. Therefore, the connector of the engine control means having another configuration and the connectors of the various drive / control means cannot be fitted, and the two cannot be electrically connected.

According to the above configuration (2), the electrical connection between the engine control means and the various drive / control means has a unique connection relationship between each electrical contact and each signal line according to the configuration of the engine control means. Therefore, even if the connector of the engine control means having another configuration is mated with the connector of the various drive / control means, it is not possible to electrically connect both of them properly. Can not.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing a shape of a fitting portion of a connector on an immobilizer unit side and a connector on a fuel injection valve 17 and the like side according to an embodiment of the present invention. FIG. FIG. 2B shows the case of the immobilizer unit 30 ′ which does not include the immobilizer ECU 10.

In this embodiment, the shape of the fitting portion between the connector on the side of the immobilizer unit and the connector on the side of the fuel injection valve 17 or the like is different depending on whether the immobilizer unit has the immobilizer ECU 10 or not. That is, they have different shapes.

In FIG. 1A, the positions of the grooves 8a, 8b, 8c and 8d provided on the connector 40a on the immobilizer unit 30 are the ribs 9a and 9b provided on the connector 50a on the fuel injection valve 17 and the like. , 9c and 9d. Similarly, in FIG. 3B, the positions of the grooves 8a, 8b, 8c and 8d provided in the connector 40b coincide with the positions of the ribs 9a, 9b, 9c and 9d provided in the connector 50b. Therefore, the connectors 40a and 50a and the connectors 40b and 50b are completely fitted to each other, and a regular electrical connection between the immobilizer unit 30 (30 ') and the fuel injection valve 17 or the like is obtained.

On the other hand, the connector 40b of the immobilizer unit 30 'having no immobilizer ECU 10
And the connector 50a to be connected to the immobilizer unit 30 originally having the immobilizer ECU 10 cannot be fitted because the rib positions and the groove positions of the two do not match.

Therefore, even if a malicious third party illegally obtains the immobilizer unit 30 ′ without the immobilizer ECU 10 and tries to use it instead of the immobilizer unit 30 with the immobilizer ECU 10, Since electrical connection cannot be obtained, the vehicle is prevented from being stolen by replacing the immobilizer unit 30 with the immobilizer unit 30 '.

In the above-described embodiment, the description has been made on the assumption that the incorrect connector fitting is prevented by changing the relative positional relationship between the groove and the rib. However, the present invention is not limited to this, and the present invention is not limited to this. Alternatively, illegal connector fitting may be prevented by completely changing the presence or absence of the ribs and the connector shape or size.

FIG. 2 is a circuit diagram showing another embodiment of the present invention, showing the pin connections of the signal lines a, b and c in the connector on the immobilizer unit side and the connector on the fuel injection valve 17 side. FIG. 5A is a diagram showing an immobilizer ECU.
(B) of FIG.
Shows a case of the immobilizer unit 30 ′ without the immobilizer ECU 10.

In this embodiment, the connection relationship between each electrical contact (connection pin) and each signal line in the connector on the side of the immobilizer unit and the connector on the side of the fuel injection valve 17 and the like is described, and the immobilizer unit includes the immobilizer ECU 10. A specific relationship, that is, a different connection relationship, is determined depending on whether or not the connection exists.

In FIG. 2A, the signal line a is connected to the pin number of the connector 40a of the immobilizer unit 30, the signal line b is connected to the pin number, and the signal line c is connected to the pin number. Then, the fuel injection valve 17 is used for the pin number, and the fuel pump 1 is used for the pin number.
8, the ignition control unit 20 is connected to the pin numbers.
As a result, the signal line a is connected to the fuel injection valve 17, the signal line b is connected to the fuel pump 18, and the signal line c is connected to the ignition control unit 20, so that proper electrical connection is obtained.

In FIG. 2B, the pin numbers of the signal lines a and b of the connector 40b on the side of the immobilizer unit 30 'are shown.
(a) is replaced, but also in the connector 50b, since the pin numbers of the fuel injection valve 17 and the fuel pump 18 are replaced, a proper electrical connection is obtained as a result.

Here, a malicious third party illegally obtains the immobilizer unit 30 'without the immobilizer ECU 10 and mounts it in place of the immobilizer unit 30 with the immobilizer ECU 10, as shown in FIG. ), The connector 40b on the immobilizer unit 30 'side
Is fitted to the connector 50a, the signal line a is connected to the fuel pump 18 and the signal line b is connected to the fuel injection valve 17a.
Will be connected. Therefore, proper electrical connection cannot be obtained, and vehicle theft due to replacement of the immobilizer unit 30 is prevented. Incidentally, when such an incorrect connection is made, the connection may be detected by an appropriate detection means, and an alarm sound or the like may be emitted.

Further, in each of the above embodiments, the shape of the fitting portion of the connector or the connection relationship between each electrical contact and each signal line in the connector is specific according to the configuration of the immobilizer unit. Any of the fitting part shape and the connection relationship may be specific.

[0029]

As described above, according to the present invention, the key control unit compares the key ID code with the reference ID code, and enables the engine to be started if the two have a preset relationship. The electrical connection with the various drive / control means controlled by the engine control means has a specific shape depending on the configuration of the engine control means, or the signal line has a specific shape depending on the configuration of the engine control means. Therefore, the connector of the engine control means having another configuration and the connectors of the various drive / control means cannot be properly electrically connected. Therefore, vehicle theft caused by replacing the original engine control means with another engine control means having a different configuration is prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a connector according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a connector according to a second embodiment of the present invention.

FIG. 3 is a block diagram of an immobilizer unit having an anti-theft function.

FIG. 4 is a block diagram of an immobilizer unit having no anti-theft function.

[Explanation of symbols]

2 ... key, 10 ... immobilizer ECU, 13 ... CPU,
13A: EEPROM, 13B: ID code register,
13S: verification function unit, 13R: starter relay drive signal generation unit, 16: engine ECU, 17: fuel injection valve, 1
8 fuel pump, 20 ignition control unit, 30 immobilizer unit, 40, 50 connector

Continuation of the front page (56) References JP-A-6-227364 (JP, A) JP-A-1-502103 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60R 25 / 04 602

Claims (3)

(57) [Claims] An engine control system without a vehicle theft prevention function
When used as a system, there is no anti-theft circuit
Engine control device with the anti-theft circuit
Engine control system with anti-theft function
And the engine is properly connected to each of the engine control systems.
At least one terminal device that performs the functions required for
When the said vehicle antitheft function engine control system
A pair of connector means for properly connecting to the terminal device.
The shape of the fitting portion of the pair of connector means is the same as the vehicle theft.
The engine control system without the prevention function and the terminal device
An anti-theft device for a vehicle, wherein the anti-theft device is configured so that it cannot be connected properly . 2. An engine control system without a vehicle theft prevention function.
When used as a system, there is no anti-theft circuit
The anti-theft device is mounted on a new engine control device.
Engine control system with anti-theft function
And the engine is properly connected to each of the engine control systems.
At least one terminal device that performs the functions required for
When the said vehicle antitheft function engine control system
A pair of connector means for properly connecting to the terminal device.
And Bei, each electrical contact and the signal La in the pair of connector means
The connection relationship with the
Connection control system and the terminal device cannot be properly connected
Vehicle anti-theft function engine control system, characterized in that it is configured to 3. The shape of the fitting portion of the pair of connector means is different from that of the engine control system without the vehicle theft prevention function.
The vehicle antitheft device according to claim 2, wherein the terminal device is not properly connected to the terminal device.