JPH08169303A - Vehicle antitheft device - Google Patents

Abstract

PURPOSE: To facilitate the replacement of an EGI which does not have an antitheft function with an EGI which has an antitheft function. CONSTITUTION: In a vehicle antitheft device incorporating a control device 14 composed of a code identifying function in which a code inputted from the outside is identified with a preset code, and if these code coincide with each other, the operation of an engine is allowed, shape of a joint at a position of a terminal in an external input connecting part of the control device 14, which terminal directly relates to engine operation, or between terminals is different from that of a control device 14' which has the same type as that of the control device 14 but does not have a code identifying function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device for preventing theft of a vehicle.

[0002]

2. Description of the Related Art In recent years, theft of vehicles has become frequent in various countries. To prevent this theft,
Conventionally, many alarm devices and the like have been proposed. As a system similar to such an alarm device, there is a keyless entry system or the like. As a keyless entry system, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 2-105469, a system in which an ID code transmitted from a transmitter is stored after a reset switch on a receiver side is turned on is proposed. However, the keyless entry system can prevent a thief from entering the vehicle interior, but once the window glass etc. is broken, it is not so difficult to start the engine. In many cases.

For example, if a thief jumps the ignition switch and directly connects the battery and the ignition system of the engine, the engine is easily started. As a method for preventing this, for example, JP-A-56-
As disclosed in Japanese Patent No. 21931, there is known one in which the engine is prevented from starting when a thief jumps the ignition switch. However, even if this technology is used, if the thief prepares a key with the same shape as the correct ignition key, the engine can be easily started without the trouble of jumping the ignition switch. I can do it.

Therefore, as a method proposed in consideration of such a case, as disclosed in Japanese Patent Laid-Open No. 58-78847, a cipher set in advance in a cipher reference device and a driver are used. It is known that the engine starting circuit is activated when the designated signs match. Recently, the immobilizer unit (immobilizer uni
A system called "t" (hereinafter referred to as "immobili unit") has been developed. In this system, a transmitter is attached to the ignition key, and an ID signal is sent from this transmitter to the immobilizer unit installed on the vehicle side
It only allows the engine to start if the signal matches the correct key on the vehicle. Therefore, even if the thief prepares a key having exactly the same shape as the correct key, the ID signal is not transmitted or the ID signal is not transmitted.
Even if the signal is transmitted, the engine cannot be started because it does not match the preset ID.

[0005]

However, the method using the immobilizer unit is not perfect.
The reason will be explained. First, below the immobilizer unit is an ECU (that is, EG) that controls the entire operation of the engine.
I) is connected, and the immobilizer unit is
Only if D matches, send a signal to the EGI to allow the engine to start. Normally, the EGI corresponding to the immobilizer function has a function of locking the engine start in a prohibited state unless the engine start permission signal is received. However, when the EGI is replaced with one that does not support the immobilizer function, the EGI that does not support the immobilizer function.
However, since there is no function to receive the start permission signal from the immobilizer unit, the engine may be started if a predetermined trigger signal is given.

For example, in the case where there is an old-type vehicle that does not have an immobilizer unit and a new-type vehicle that has an immobilizer unit in the same vehicle type, there is no immobilizer function from the old-type vehicle.
If the GI is removed and replaced with the EGI of the new model vehicle, the immobilizing function will not work even in the new model vehicle, and the engine can be started by the above method. Further, the method disclosed in Japanese Patent Laid-Open No. 58-78847 has the same problem.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an EGI having no antitheft function and an EGI having an antitheft function.
It is an object of the present invention to provide a vehicle theft prevention device in which the replacement of the vehicle cannot be easily performed.

[0008]

In order to solve the above-mentioned problems and achieve the object, a vehicle theft prevention device according to the present invention collates a code input from the outside with a preset code, and In a vehicle anti-theft device equipped with a control device having a code collating function that allows the engine to operate when the codes of the above are matched, in the external input connection part of the control device, a terminal position directly related to the engine operation or a joint shape between the terminals Is different from the control device of the same type having no code collating function.

Further, the vehicle theft prevention device according to the present invention is characterized by further comprising a cover for covering at least the external input connection portion of the control device.

Further, in the vehicle anti-theft device according to the present invention, the cover is configured to cover the external input connecting portion and a wire harness connected to the external input connecting portion. .

Further, in the vehicle anti-theft device according to the present invention, the cover is attached to the vehicle body with a bolt for separating the tool engaging portion from the bolt main body with a predetermined torque.

Further, the vehicle antitheft device of the present invention has a code collating function for collating a code inputted from the outside with a preset code and permitting the engine to operate when the codes coincide. A vehicle anti-theft device including a device is characterized by including a cover that covers at least an external input connection portion of the control device.

Further, in the vehicle theft prevention device according to the present invention, the cover is attached to the vehicle body by using a bolt for separating the tool locking portion from the bolt body with a predetermined torque.

[0014]

Since the vehicle theft prevention device according to the present invention is constructed as described above, a thief prepares a control device of the same type without a code reference function and replaces it with a control device having a code reference function. Therefore, when the engine is operated with the code reference function in the inoperative state, the terminal arrangement of the external input connection portion or the joint shape between the terminals is different between the above two control devices. It is prevented that the two control devices are interchanged.

Further, since the external input connection part of the control device is covered with the cover, the connector coupled to the external input connection part cannot be easily removed, so that the control device can be replaced easily. Is prevented.

Further, by making the cover cover not only the external input connection portion but also the wire harness, it is possible to prevent the harness from being cut and the connection being changed.

Further, since the tool engaging portion of the bolt for attaching the cover is separated from the bolt main body with a predetermined torque, the bolt cannot be easily removed after the cover is attached, and the control device Is prevented from being easily replaced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. Before that, the background of the present invention will be briefly described once again.

As described in the section of the prior art, a system called an immobilizer unit has recently been developed to prevent the vehicle from being stolen. The immobilizer unit (hereinafter, referred to as an immobilizer unit) is a device that prevents the engine from starting even if a thief enters a vehicle cabin and turns on an ignition switch, for example. The principle is, as already explained, that a transmitter is attached to the ignition key, an ID signal is sent from this transmitter to the immobilizer unit of the vehicle, and when this ID signal matches that of the correct key of the vehicle. The first is to allow the engine to start.
Specifically, an EGI unit that controls the operation of the engine is provided between the immobilizer unit and the engine, and the immobilizer unit starts the engine to the EGI unit only when it is confirmed that the ID matches the key. Send a signal to allow. If the ID does not match the key, a signal that prohibits engine start is sent. Therefore,
Even if the thief prepares a key with the same shape as the correct key, the ID signal is not transmitted, or even if the ID signal is transmitted, it does not match the preset ID, so the immobilizer unit prohibits engine start That is, it cannot output the signal to start the engine.

However, when an immobilizer unit is newly adopted due to a model change or the like for a certain car model, an old model vehicle without the immobilizer unit and a new model car equipped with the immobilizer unit coexist in the same car model. It will be. In that case, even if the model is changed, the design of the entire vehicle is not changed at all, and the EGI unit and the engine are connected for the purpose of cost reduction due to common parts. The pin layout and connector shape of the connector often follow those of the old model. Therefore, the EG of the new vehicle
It is easy to remove the I unit and replace it with that of an old vehicle. In such a case,
Since the EGI unit of the old model vehicle does not have a function of receiving the permission signal or the prohibition signal from the immobilizer unit, the engine is started if a predetermined trigger signal is given. In particular, recently, there is a strong tendency for theft of vehicles to be carried out systematically.
It is not difficult to start the engine by removing the I unit and replacing it with the EGI unit of the new model vehicle in a short time.

Therefore, in the following embodiments, a vehicle theft prevention device that assumes such a situation will be described.

FIG. 1 is a block diagram showing the overall construction of a vehicle theft prevention device according to an embodiment.

In FIG. 1, the engine 12 of the vehicle is
An EGI control unit 14 for controlling the overall operation of the engine is connected via a connector 15, and an EMOBI unit 16 is connected to this EGI control unit 14 via a connector 17. An ID signal is input to the immobilizer unit 16 from the key 18 via the key cylinder 20 on the vehicle side. A preamplifier 21 for amplifying an ID signal is connected between the key cylinder 20 and the immobilizer unit 16.

The operation of the vehicle antitheft device thus constructed will be described with reference to FIG.

First, when the key 18 is inserted into the key cylinder 20, the key 1 is electromagnetically coupled to the key 1 by the key 1.
The ID signal set to 8 is transmitted to the immobilizer unit 16 via the coil 19 in the key cylinder 20. The immobilizer unit 16 collates the ID from the key 18 with the ID preset in the immobilizer unit 16, and when the IDs match, sends a signal to the EGI control unit 14 to permit engine start. Also,
If the IDs do not match, the EGI control unit 14 is sent a signal that prohibits engine starting. E
The GI control unit 14 makes a first determination as to whether to start the engine 12 based on these signals.

On the other hand, the EGI control unit 14 is also sent with an ID signal set in the immobilizer unit 16, and the EGI control unit 14 compares this ID with the ID set in the unit 14 in advance. As a result, the EGI control unit 14
Makes a second determination as to whether to start the engine 12.

Then, the engine is started only when the IDs of both the first determination result and the second determination result match. That is, in the present embodiment, there is a double check of the first check whether the key 18 and the immobilizer unit 16 correspond and the second check whether the immobilizer unit 16 and the EGI control unit 14 correspond. It will be done. In addition, in the above-mentioned first determination and second determination, the EGI control unit 1
When neither the engine start permission signal nor the prohibition signal is input to 4, or the ID signal from the immobilizer unit is not input, the EGI control unit 14 is locked in a state where the engine is not started.

Next, the reason for performing the double check as described above will be described with reference to FIG.

There are three possible combinations of EGI control unit 14 and vehicle as shown in FIG.

First, as shown in FIG. 3A, a vehicle having an immobilizing function (vehicle having the immobilizing unit 16 mounted) is connected to an EGI control unit 14 corresponding to the vehicle. If there is. In this case, even if the thief brings a key with the same shape as the original key (however, the ID is different), the ID of the key does not match the ID of the immobilizer unit 16 due to the original immobilizing function. Can not be started.
In addition, for example, when the connector 17 is removed and the EGI control unit 14 and the immobilizer unit 16 are separated, the EGI control unit 14 does not receive the ID signal from the immobilizer unit 16, so E
The GI control unit 14 is automatically locked, and the engine cannot be started even if a trigger or the like is externally applied.

The next conceivable case is, as shown in FIG. 3B, a case where an EGI control unit 14 'of an old model vehicle having no immobilizing function is connected to a vehicle having an immobilizing function. In this case, E which does not have immobilization function
The GI control unit 14 'is the immobilizer unit 1
Since it operates completely independently of 6, the engine will start if a predetermined trigger signal is applied from the outside. In consideration of this case, in the present embodiment, the EGI control unit is devised so as not to be replaced with another one by the configuration described in detail later.

The last conceivable thing is FIG. 3 (c),
As shown in (d), a vehicle having an immobilizing function is connected to an EGI control unit 14 "corresponding to the immobilizing function, which is detached from another vehicle of the same type. In this case, the EGI control unit 14" is connected as shown in FIG. Control unit 1
If the 4 "is connected to both the engine and the immobilizer unit 16, the ID from the immobilizer unit 16 does not match the ID of the EGI control unit 14".
The control unit 14 "is in a locked state and the engine cannot be started. Also, when the EGI control unit 14" is connected to the engine only as shown in Fig. 3 (d), the EGI control unit 14 "
No signal from the immobilizer unit 16 is input to the EGI control unit 1 as described above.
The 4 "is still locked and the engine cannot be started.

As described above, in each of the above cases, starting of the engine is prohibited and the vehicle is prevented from being stolen.

Next, as a countermeasure for the case of FIG. 3 (b) described above, a configuration will be described in which the EGI control unit of the vehicle cannot be easily replaced with another.

FIG. 4 is a view showing the mounting structure of the vehicle theft prevention device of this embodiment to the vehicle body.

In FIG. 4, an instrument panel center member 22 is integrally formed at a substantially central portion of an instrument panel of a vehicle. Instrument panel center member 22
Is a pair of vertical portions 22a, 22b extending in the vertical direction of the vehicle body.
And a horizontal portion 22c bridging the vertical portions 22a and 22b. EGI control unit 14
Is fixed to the front surface of the horizontal portion 22c of the instrument panel center member 22 with bolts 24. The EGI control unit 14 is formed with female connectors 15a, 15b, 17a as external input connection parts, and the wire harness 26 disposed on the vehicle body side of the female connectors is connected to the male connectors 15c, 15d. , 17b. The female connectors 15a and 15b and the male connectors 15c and 15d are
The connector 15 corresponds to the connector 15 in FIG.
The I control unit 14 and the engine 12 are connected. Further, the female side connector 17a and the male side connector 17b correspond to the connector 17 in FIG. 1, and connect the EGI control unit 14 and the immobilizer unit 16. The immobilizer unit 16 is installed at a predetermined position on the vehicle body that cannot be easily reached.

On the other hand, a cover mounting bracket 28 extending from the vehicle body side is provided above the horizontal portion 22c of the instrument panel center member 22, and a cover mounting nut 30 is fixed to the rear surface of the bracket 28 by welding or the like. Has been done. A cover 32 is fixed to the bracket 28 by a bolt 34 to cover the EGI control unit 14 so that the male connectors 15a, 15b, 17a of the wire harness 26 cannot be easily removed from the EGI control unit 14. The cover 32 is integrally formed with a mounting portion 32a for the bracket 28 and mounting portions 32b, 32c for the vertical portions 22a, 22b of the instrument panel center member 22. Mounting part 32
The b and 32c are fixed to the vertical portions 22a and 22b by bolts 36. Further, the lower end 32d of the cover 32 may be damaged to the wire harness 26 if it has a sharp edge, so that the flange 32e is bent outward.
Is composed. This flange portion 32e is a cover 32
Also plays a role of reinforcing.

FIG. 5 is a side view of the mounting structure of FIG.

In FIG. 5, the EGI control unit 14 is located on the front side of the vehicle body with respect to the audio unit 42 and the ashtray 44 arranged on the vehicle compartment side of the instrument panel. First, the audio unit 42 and the ashtray 44 are arranged. It is located in a position that cannot be reached without removing the etc. The EGI control unit 14 is attached to the instrument panel center member 22 as already described with reference to FIG.
4, a wire harness 26 for exchanging signals with the engine 12 and the immobilizer unit 16 is provided with male connectors 15c, 15d, 17b and female connectors 15a, 15b.
b, 17a. The connectors 15c, 15d and 17b are connected to the EGI control unit 1
The periphery of the portion connected to 4 is covered with a cover 32. Further, since the wire harness 26 is flexible, it may come into contact with the lower end portion 32d of the cover 32. At this time, the lower end portion 32d of the cover 32 is bent outward and rounded so that the wire harness 26 is not damaged at the lower end portion 32d of the cover 32 and is not broken. The cover 3 is shown in FIG.
2 is configured to cover only the connector portion, but it may be configured to cover the whole including the wire harness 26.

Next, FIG. 6 is a view showing the structure of the bolts 34 and 36 for attaching the cover 32 to the vehicle body side. Since the bolts 34 and 36 have a completely common structure,
As a representative of these, the structure of the bolt 34 will be described.

In FIG. 6, the bolt 34 includes a male screw portion 34a screwed into a nut on the vehicle body side, and the male screw portion 3
It is composed of a head portion 34b attached to the end of 4a and a tool engaging portion 34c connected to this head portion. The connecting portion between the head portion 34b and the tool engaging portion 34c is formed in a constricted shape as shown in FIG. 6 (a) and constitutes a cutting portion 34d.

The bolt 34 thus constructed is
First, when screwed into the nut on the vehicle body side, a tool such as a wrench is engaged with the tool engaging portion 34c and rotated. Then, when the bolt 34 is completely screwed in and further tightened to a certain tightening torque, the cutting portion 34d is screwed and the tool engaging portion 34c becomes the head portion 34b as shown in FIG. 6 (b).
Separated from Therefore, when the attachment of the bolt 34 is completed, only the head portion 34b remains outside the cover 32. Since the outer shape of the head portion 34b is formed in a circular shape, the tool cannot engage with the head portion 34b, and the bolt 34 cannot be loosened easily. In this way, the bolt 34 cannot be easily removed after the cover 32 is attached by the bolt 34, and the EGI control unit 14 is prevented from being replaced.

Next, FIG. 7 is a view showing the pin arrangement of the connector for connecting the EGI control unit 14 to the engine 12 and the immobilizer unit 16. here,
Since the connector 15 and the connector 17 have substantially the same configuration, the features of the pin arrangement of the connectors 15a and 15c will be described as a representative thereof.

In FIG. 7A, the connectors 15a, 1
If the signal pins (for example, the pins that pass the control signals of the fuel pump system and the ignition system) directly related to the 5c engine start are A and B, in the EGI control unit 14 corresponding to the immobilizer function, the connector 15c on the wire harness side is used. The positions of the pins A and B are the same. Therefore, the connector 1
If the 5a and 15c are connected, the EGI control unit 14 and the engine 12 are normally connected, and the normal immobilizing function works.

In this embodiment, at least the signal pin A, B of the new type EGI control unit 14 corresponding to the immobilizer function, which is directly related to the start of the engine, does not correspond to the immobilizer function of the old model EGI. The control unit 14 'is consciously different. Therefore, for example, when the thief tries to start the engine by replacing the new EGI control unit 14 with the old EGI control unit 14 ', even if the connector 15a' and the connector 15c are connected, the signal pins A and B are connected. Are not properly connected as shown in FIG. Therefore, the correct control signal from the EGI control unit is not transmitted to the engine, the engine is not started, and the theft of the vehicle can be prevented.

As described above, in the above embodiment, the first anti-theft measure is to cover the EGI control unit with the cover that cannot be easily removed, and the new EGI is used even if the cover is removed. Since the control unit and the old-type EGI control unit have different pin arrangements, the EGI control unit cannot be easily replaced, so a double anti-theft measure is implemented, which is a second anti-theft measure. Theft can be effectively prevented.

The present invention can be applied to modifications or variations of the above embodiments without departing from the spirit of the present invention.

[0048]

As described above, according to the vehicle theft prevention device according to the present invention, a thief prepares a control device of the same type which does not have a code reference function and a control device having a code reference function. When trying to operate the engine with the code reference function in the inoperative state by exchanging the code, the terminal arrangement of the external input connection part or the joint shape between the terminals is different between the above two control devices. It is prevented that the two control devices are replaced with each other.

Further, since the external input connection part of the control device is covered with the cover, the connector connected to the external input connection part cannot be easily removed, so that the control device can be easily replaced. Is prevented.

Further, by making the cover cover not only the external input connection portion but also the wire harness, it is possible to prevent the harness from being cut and the connection being changed.

Further, by making the tool engaging portion of the bolt for attaching the cover separate from the bolt main body with a predetermined torque, the bolt cannot be easily removed after the cover is attached, and the control device can be removed. Is prevented from being easily replaced.

[0052]

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a vehicle theft prevention device according to an embodiment.

FIG. 2 is a diagram for explaining the operation of the vehicle antitheft device.

FIG. 3 is a diagram showing a combination of an EGI control unit and a vehicle.

FIG. 4 is a view showing a mounting structure of a vehicle antitheft device to a vehicle body.

5 is a side view of the mounting structure of FIG.

FIG. 6 is a diagram showing a structure of a bolt for attaching the cover to the vehicle body side.

FIG. 7 is a diagram showing a pin arrangement of a connector that connects an EGI control unit to an engine and an immobilizer unit.

[Explanation of symbols]

 12 engine 14 EGI control unit 15,17 connector 16 immobilizer unit 18 key 20 key cylinder 21 preamplifier 22 instrument panel center member 24 bolt 26 wire harness 28 cover mounting bracket 30 nut 32 cover 34,36 bolt

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshifumi Shirai 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (6)

[Claims] 1. A vehicle theft prevention device comprising a controller having a code collating function that collates a code input from the outside with a preset code and allows the engine to operate when the codes match. A vehicle antitheft device characterized in that a terminal position directly related to engine operation or a joint shape between terminals in an external input connection portion of the control device is different from that of the same type control device having no code matching function. . 2. The vehicle antitheft device according to claim 1, further comprising a cover that covers at least the external input connection portion of the control device. 3. The vehicle antitheft device according to claim 2, wherein the cover is configured to cover the external input connection part and a wire harness connected to the external input connection part. . 4. The vehicle antitheft device according to claim 1, wherein the cover is attached to the vehicle body with a bolt that separates the tool locking portion from the bolt body with a predetermined torque. 5. A vehicle theft prevention device comprising a control device having a code collating function for collating a code inputted from the outside with a preset code and permitting engine operation when the codes coincide. A vehicle antitheft device comprising a cover for covering at least the external input connection portion of the control device. 6. The vehicle antitheft device according to claim 5, wherein the cover is attached to the vehicle body with a bolt that separates the tool locking portion from the bolt body with a predetermined torque.