JPH08324388A - Theft preventing device for vehicle - Google Patents

Abstract

PURPOSE: To register ciphers while dispensing with an exclusive tool by providing a cipher register for registering the ciphers in an immobilizer by switching a registration on and off according to a specified rule. CONSTITUTION: At the time of registering ciphers, a failure diagnostic terminal 8 is turned on to put an immobilizer ECU 4 in a registration mode, and in this state, a brake pedal is operated by the specified times in the specified order on the basis of a specified rule. A registration switch 13 is thereby switched on and off according to the specified rule, and the ciphers corresponding to the on-off operation of the registration switch 5 are registered in the memory 17 of the immobilizer ECU 4. The ciphers can therefore be registered while dispensing with an exclusive tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antitheft device used in a vehicle.

[0002]

2. Description of the Related Art Conventionally, an anti-theft device for a vehicle has an ignition key (ID code transmitting device) having a transponder for transmitting a user ID code for identifying a user.
And an immobilizer ECU that performs antitheft control and the like.

In the conventional device, when the ignition key is turned on, the transponder is driven by the transponder driving antenna coil of the immobilizer ECU, the transponder transmits the ID code, and the ID code and the immobilizer ECU are transmitted. The registered predetermined ID code is collated, and if they match each other, the engine operation permission code is output to the engine ECU.

In an emergency such as when the transponder driving antenna coil of the immobilizer ECU or the transponder itself is defective, a separately set secret code (emergency code) is input and verified to prevent the immobilizer ECU from theft. Is to be released.

When the personal identification code is registered on the immobilizer ECU side, it is registered in the ECU by a dedicated writing tool after it is set to a writable registration mode by a dedicated mode setting device such as a diagnostic tester.

[0006]

However, the above-mentioned conventional vehicle antitheft device uses a dedicated writing tool such as a master key or a diagnostic tester to write and register the above-mentioned personal identification code for canceling the antitheft function. There is a problem of cost. Further, there is a problem that a dedicated tool is required even when the registered personal identification code is input from the outside in the emergency.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle antitheft device which does not require a dedicated tool for registration of a personal identification code and emergency input. .

[0008]

The invention according to claim 1 is as shown in FIG.
As shown in FIG. 3, an ID code transmitting device 5 for transmitting an ID code for identifying a user by turning on an ignition key.
When the input ID code from the ID code transmission device 5 matches the built-in registered ID code, the engine ECU
In an anti-theft device 1 for a vehicle equipped with an immobilizer ECU 4 for transmitting an engine operation permission code to 3, a personal identification code input switch 13 that is turned on and off by operating an accelerator pedal, a brake pedal, and the like, and the immobilizer ECU 4 are ID codes. When the immobilizer ECU 4 is set to the ID code registration mode, the input switch 13 is provided with the registration mode setting means 18 for setting the registration mode and the secret code for transmitting the permission code.
PIN code registration means 1 for registering in the immobilizer ECU 4 by turning on and off according to a predetermined rule.
It is characterized by having 4 and.

According to a second aspect of the present invention, an ID for transmitting an ID code for identifying a user by turning on an ignition key.
When the code transmission device 5 and the input ID from the ID code transmission device 5 match the built-in registration ID, the engine E
In the vehicle anti-theft device 1 including an immobilizer ECU 4 that sends an engine operation permission code to the CU 3, registration mode setting means 18 for setting the immobilizer ECU 4 in an ID code registration mode, and for transmitting the permission code. Enter the PIN code above the immobilizer EC
When the U4 is set to the ID code registration mode, the immobilizer E4 is turned on and off according to a predetermined rule to turn on and off the failure diagnosis terminal of the immobilizer E4.
A feature is that the personal identification code registration means 14 for registering in the CU 4 is provided.

A third aspect of the present invention is the diagnostic mode setting means 20 according to the first or second aspect, which sets the immobilizer ECU 4 and the engine ECU 3 in a failure diagnostic mode.
When both the ECUs 4 and 3 are set to the failure diagnosis mode, the failure diagnosis terminal 8 of the immobilizer ECU 4 is turned on and off according to a predetermined rule to input the corresponding personal identification code registered in the immobilizer ECU 4. PIN code input means 1 for inputting a PIN code
It is characterized by having 5.

[0011]

According to the vehicle antitheft device 1 of the invention of claim 1,
By operating the brake pedal or the like, the input switch 13 is turned on a predetermined number of times in a predetermined order according to a predetermined rule,
It is turned off, so that an arbitrary secret code based on the above rule is registered by the registering means 14 to the immobilizer ECU.
Registered in 4.

When a regular ID code is not transmitted due to a defective transponder of the ignition key,
By entering the above PIN code, immobilizer E
The permission code is transmitted from the CU4 to the engine ECU3,
The engine can be started.

In this way, the brake switch etc. is turned on,
By turning it off, the security code is immobilizer EC
Since it is registered in U4, it is possible to cope with a defect in the transmission function on the ignition key side or the antenna coil function on the immobilizer side while eliminating the need for a dedicated writing tool such as a diagnostic tester.

In the vehicle antitheft device 1 according to the second aspect of the invention, since the personal identification code is registered by turning on / off the failure diagnosis terminal of the immobilizer ECU 4, the personal identification code is written without using a dedicated tool. Moreover, since the failure diagnosis terminal is used, it is not necessary to provide an additional input switch.

Further, in the third aspect of the invention, since the input personal identification code corresponding to the registered personal identification code registered in the immobilizer ECU 4 is input by turning on / off the failure diagnosis terminal of the immobilizer ECU 4, it is dedicated. With no need for tools, it is possible to deal with emergencies such as a transmission function on the ignition key side and a defective antenna coil function on the immobilizer ECU side.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are configuration diagrams for explaining a vehicle antitheft device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a vehicle antitheft device, and the device 1 has an I specific to each user as shown in FIG.
An ignition key 2 having a transponder (ID code transmitter device) 5 for transmitting a D code, an immobilizer ECU 4 for performing antitheft control, and the immobilizer E.
The engine ECU 3 continues the operation of the engine when the engine operation permission code is input from the CU 4.

As shown in FIG. 2, the immobilizer ECU 4 is connected with a battery 6, a check lamp 7, a test terminal (fault diagnosis terminal) switch 8, and the engine ECU 3 for controlling ignition timing and fuel injection. A test terminal (fault diagnosis terminal) switch 10 is connected to the engine ECU 3. The test terminal switches 8 and 10 are connected to the immobilizer ECU 4,
Engine ECU3 failure diagnosis mode (diag mode)
, And is generally provided in the ECU.

The immobilizer ECU 4 receives the ID code from the transponder 5 and compares the ID code with the registered ID code in the built-in memory 16 and an engine when the both codes match. Permission code transmission function 1 to transmit the driving permission code
2 is provided.

The immobilizer ECU 4 is connected with a personal identification code registration switch 13 which is turned on and off by depressing a brake pedal or the like. The immobilizer ECU 4 turns on the test terminal switch 8 to enter an ID code registration mode. Register mode setting function 21
And a secret code registration function 14 for registering the secret code based on the rule in the built-in memory 17 when the registration switch 13 is turned on / off according to a predetermined rule in the registration mode.

Furthermore, the immobilizer ECU 4
Is a diagnostic mode setting function 22 that sets the immobilizer ECU 4 to a failure diagnostic mode by turning on the terminal switches 8 and 10, and a personal identification code by turning on and off the terminal switch 8 in a predetermined rule in the diagnostic mode. It has a secret code input function 23 for inputting.

The check lamp 7 monitors the input status of the registration switch 13 and the input switch 8.

Next, the operation of the vehicle antitheft device 1 will be described. When the ignition key 2 is turned on,
The transponder is driven by the antenna coil of the immobilizer ECU 4 to transmit a user ID code, and the immobilizer ECU 4 collates the received ID code with a predetermined built-in ID code. If they match, the engine ECU 3 is permitted to drive. The engine is started when the code is output and the ignition key 2 is rotated to the starter-on position.

In the apparatus of this embodiment, a secret code is registered in the memory 17 in order to cope with an emergency such as damage to the antenna coil or failure of the transponder. The anti-theft function of the immobilizer ECU is canceled.

First, registration of the above-mentioned personal identification code is performed in the following procedure. That is, the failure diagnosis terminal (test terminal) 8 is turned on to set the immobilizer ECU 4 in the registration mode, and in this state, the brake pedal is operated a predetermined number of times in a predetermined order based on a predetermined rule. As a result, the registration switch 13 is turned on according to the predetermined rule,
It is turned off, and the secret code (emergency code) corresponding to the on / off operation of the registration switch 5 is registered in the memory 17 of the immobilizer ECU 4.

In order to start the engine in the above emergency, both the test terminal 8 of the immobilizer ECU 4 and the test terminal 10 of the engine ECU 3 are turned on so that the immobilizer ECU 4 is in the diagnostic mode and the test terminal 8 is set to a predetermined rule. When the on / off operation is performed on the basis of the operation, a personal identification code corresponding to the operation is transmitted, and the personal identification code is collated with the registered personal identification code. When the both coincide, the antitheft function of the immobilizer ECU 4 is released and the engine can be started. Become.

As described above, since the personal identification code is registered in the immobilizer ECU 4 by operating the brake pedal, the personal identification code can be registered without using a dedicated tool. Also, by operating the test terminal 8,
Since the personal identification code is input, the antitheft function of the immobilizer ECU can be canceled without the need for a dedicated tool, and the above emergency can be dealt with.

As a method of registering the personal identification code in the immobilizer ECU 4, the immobilizer ECU 4 is used.
Alternatively, the test terminal switch 8 may be turned on and off. This is the invention of claim 2, and in this case also, as in the above case, a dedicated tool can be dispensed with.

[0029]

As described above, in the vehicle antitheft device according to the invention of claim 1, the personal identification code is registered by turning on and off the brake switch and the like.
In the vehicle antitheft device according to the second aspect of the present invention, since the personal identification code is registered by turning on / off the failure diagnosis terminal, there is an effect that the personal identification code can be registered without using a dedicated tool.

Further, in the vehicle antitheft device according to the third aspect of the present invention, since the personal identification code is input by turning on / off the failure diagnosis terminal, the personal identification code can be obtained without using a dedicated tool as in the above. This has the effect of being able to input and responding to an emergency when a defect such as the ID code transmitting device or receiving function occurs.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a vehicle antitheft device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the apparatus of the above embodiment.

FIG. 3 is a configuration diagram showing the device of the embodiment.

FIG. 4 is a claim configuration diagram of the present invention.

[Explanation of symbols]

 1 Anti-theft device for vehicle 3 Engine ECU 4 Immobilizer ECU 5 ID code transmitter 8 Test terminal switch (input switch) 13 Registration switch 14 PIN code registration means 15 PIN code input device 18 Registration mode setting means 20 Diagnostic mode setting means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Omori 2-1-1 Taoyuan, Ikeda City, Osaka Daihatsu Industry Co., Ltd.

Claims (3)

[Claims] 1. An engine ECU for an engine when an ID code transmitting device for transmitting an ID code for identifying a user by turning on an ignition key and an input ID code from the ID code transmitting device and a built-in registered ID code match. Immobilizer EC that sends a driving permission code
In a vehicle anti-theft device including U, a registration switch that is turned on and off by operating an accelerator pedal, a brake pedal, and the like, a registration mode setting unit that sets the immobilizer ECU in an ID code registration mode, and the permission code. The personal identification code register means for registering a personal identification code for transmission to the immobilizer ECU by turning the registration switch on and off according to a predetermined rule when the immobilizer ECU is set to the ID code registration mode. A vehicle antitheft device characterized by the above. 2. An engine ECU is provided with an engine when an ID code transmitting device for transmitting an ID code for identifying a user when the ignition key is turned on and an input ID code from the ID code transmitting device and a built-in registered ID code match. Immobilizer EC that sends a driving permission code
In an anti-theft device for a vehicle including U, the immobilizer ECU sets a registration mode setting unit for setting the immobilizer ECU in an ID code registration mode and a secret code for transmitting the permission code in an ID code registration mode. An anti-theft device for a vehicle, comprising: a secret code registration means for registering a fault diagnosis terminal of the immobilizer ECU on and off according to a predetermined rule when the immobilizer ECU is set. 3. The immobilizer ECU according to claim 1, wherein the immobilizer ECU and the engine ECU are set in a failure diagnosis mode, and the immobilizer ECU is set when the both ECUs are set in the failure diagnosis mode.
Vehicle theft, characterized by further comprising: a personal identification code input means for inputting an input personal identification code corresponding to the registered personal identification code registered in the immobilizer ECU by turning on / off the failure diagnosis terminal of (1) according to a predetermined rule. Prevention device.