JPH10175512A - Theft-proofing device using code type transponder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable registration of a novel key having a code type transponder. SOLUTION: An ECU 20 perform communication with a transponder 10a provided with a registration key 10, such as a master key. When the collation result of function data stored at an EEPROM 20f coincides with that of function data written at the transponder 10a, the starting of an engine is practicable. When function data is written at a transponder arranged at a nonregistering novel key, communication between the registration key 10 and the transponder 10a is effected. When the collation result of function data stored at the EEPROM 20f coincides with that of function data written at the transponder 10a of the registration key 10, function data stored at the EEPROM 20f is written at a transponder for a novel key.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device capable of registering a new key in addition to a registered key such as a master key.

[0002]

2. Description of the Related Art Conventionally, as a key used for starting an engine of a vehicle or locking and unlocking a door, a key which duplicates the shape of a master key is newly added in consideration of a plurality of persons using the vehicle. Sometimes. here,
When a new key is added to a vehicle provided with an anti-theft function, a key to be newly added, that is, a transponder provided in the new key and an electronic control unit (hereinafter referred to as an ECU) having the anti-theft function are used. It is necessary to register a new key in the ECU by communicating between the ECUs.

[0003] In the conventional registration of a new key, authentication data pre-written in the transponder is read from an R / O (read-only) type transponder provided in the new key, and transmitted to the ECU. It is written and stored in the ECU.

[0004]

However, in recent years,
In order to prevent key theft by a key theft, encryption transponders that cannot rewrite and read the authentication data once the authentication data is written to the transponder have begun to be used. Since the encryption type transponder cannot read the authentication data, using the conventional method, the new key with the encryption type
There is a problem that cannot be registered in U.

The present invention has been made in view of the above problems, and has as its object to enable registration of a new key having an encryption type transponder.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a communication is performed between a transponder provided in a registration key and an ECU having an anti-theft function, and correct communication is performed. The registration of the new key can be set when the operation is performed, the communication between the transponder provided for the new key and the ECU is performed, and the authentication data of the registration key stored in the ECU is transmitted to the transponder of the new key. It is characterized by writing.

Therefore, even if a new key is provided with an encryption type transponder, the registration using the registration key authentication data stored in the ECU allows the new key to be properly registered by confirming the registration key in advance. It can be carried out. According to the invention as set forth in claims 2 to 5, communication is performed between the transponder provided in the master key and the ECU having the anti-theft function, and registration of a new key can be set when communication is performed correctly. The communication is performed between the transponder provided for the new key and the ECU, and the authentication data matching the authentication data of the master key is written in the transponder of the new key.

Therefore, even if a new key has an encryption transponder, the new key can be properly registered using the master key. In the invention according to claim 6, after writing, it is checked whether or not the authentication data is correctly written to the transponder of the new key, and the check result is notified to the registration operator of the new key. The registration operator of the new key can determine whether the new key can be used based on the check result.

In the invention according to claim 7, in the anti-theft device using the encryption type transponder, when the authentication data is written in the transponder provided in the new key, communication is performed with the transponder of the registration key. When the authentication data stored in the storage means of the ECU and the authentication data written in the transponder of the registration key match, the writing is permitted.

Therefore, also in this case, a new key can be properly registered for a new key provided with an encryption type transponder by using the authentication data of the registration key stored in the ECU. The invention according to claim 8 includes means (104a) for determining that the registration key is a pre-registered master key (11). The above-mentioned writing is permitted on condition that it is determined that

As described above, the registration of a new key can be restricted by using the condition of matching a previously registered master key when registering a new key. In other words, when the anti-theft device is applied to a vehicle or the like, the registration key is lent during the period of renting a vehicle such as a rental car. However, if the registration key is not the master key, a new key cannot be registered. It is possible to prevent a new key from being illegally registered by a registration key other than the above.

[0012] According to a ninth aspect of the present invention, in addition to the above matching of the collation result, it is determined that a registration operation for registering a new key is performed, and the writing is performed. I have. Therefore, it is possible to identify both the normal operation of the anti-theft operation and the registration of the new key and perform both operations. According to the tenth aspect of the present invention, the key identification code of the new key is written in the transponder of the new key and the storage means of the ECU, and when the authentication data and the key identification code match, the start of the motor is started. The feature is that it is made possible.

Therefore, for example, even if the registered key is lost, if the key identification code corresponding to the key is stored and erased from the storage means, even if the lost key is used, the key identification code is maintained. Since they do not match, theft of the vehicle can be prevented. According to the eleventh aspect of the present invention, it is checked whether or not the authentication data is correctly written in the new key, and the check result is notified to the registration operator of the new key. The key registration operator can determine whether the new key can be used based on the check result.

According to a twelfth aspect of the present invention, in the ECU having the anti-theft function, communication is performed between the electronic key transponder and the authentication data stored in the storage means and the authentication data written in the transponder. First determining means for determining whether or not the matching results of the first key match each other, second determining means for determining whether a registration operation for registering a new key has been performed, and first determining means And a means for writing authentication data to the transponder provided in the new key when the second determination means determines that the matching result has been matched and the second determination means has determined that the registration operation has been performed. Features.

Therefore, also in the present invention, by confirming using the registration key and determining the presence or absence of the registration operation, it is possible to properly register the new key even if the new key has an encryption type transponder. it can. According to the thirteenth aspect of the present invention, an E having an anti-theft function is provided.
The CU communicates with a transponder of an electronic key and determines whether the electronic key is a pre-registered master key, and a registration unit for registering a new key. A second determining means for determining whether an operation has been performed, and a first determining means determining that the operation is a master key, and the second determining means determining that a registration operation has been performed. Means for writing authentication data matching the authentication data of the master key into the transponder provided for the new key.

Therefore, according to the present invention, it is possible to properly register a new key even with a new key having an encryption type transponder by determining whether there is a confirmation and registration operation using a master key. Can be.
Note that the above-described registration key and new key transponders are cryptographic transponders in which once the authentication data has been written, the authentication data cannot be rewritten and read, and as the authentication data, as will be described in an embodiment described later. In addition, function data for calculating and processing the question data sent from the ECU at the time of the theft determination can be used.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows the configuration of a vehicle antitheft device. The registration key (a registered master key or a new key registered) 10 is a transponder 10
This is an electronic key incorporating a. Transponder 10a
Is an encryption-type transponder in which function data as authentication data is written. When an excitation signal (for example, a SIN wave of a fixed frequency) is received from the vehicle side, the energy is stored in a capacitor, and operation is performed using the energy as a power supply. .

On the vehicle side, there is provided an ECU 20 having an anti-theft function, and an amplifier circuit 21 for receiving an excitation start signal from the ECU 20 and transmitting an excitation signal from the antenna 22 to the registration key 10. The ECU 20 has a CPU
20a, a ROM 20b, a RAM 20c, an input / output buffer 20d, an input / output circuit 20e, and an EEPROM 20f. The same function data as the function data stored in the transponder 10a is stored in the EEPROM 20f.

The ECU 20 communicates with the transponder 10a of the registration key 10, compares the function data stored in the EEPROM 20f with the function data written in the transponder 10a, and confirms that the matching results match. Is determined, the engine can be started. That is, the control of the injector 23 and the igniter 24 is started via the drive circuits 20g and 20h.

In the following description, the function data written in the transponder is represented by Ft (X), EE
The function data stored in the PROM 20f is
(X). ECU 20 and transponder 10a
Communication between the devices and collation of the function data are performed as follows.

First, the CPU 20a outputs an excitation start signal to the amplifier circuit 21, and the registration key 10
To transmit the excitation signal. CP
U20a outputs an excitation stop signal to the amplifier circuit 21 after a predetermined time (for example, 50 ms) has elapsed, and stops transmission of the excitation signal from the antenna 22. By transmitting the excitation signal for a certain period of time, the transponder 10a becomes operable.

Thereafter, the CPU 20a sends the question data X
(A data group generated by random numbers, which is different every time) is output to the amplifier circuit 21. The amplifier circuit 21
The signal group data of "1" and "0" from the CPU 20a is converted into a frequency (for example, the frequency is B when it is "1" and the frequency C when it is "0") and transmitted from the antenna 22 to the transponder 10a.

The transponder 10a transmits the function data Ft
Using (X), answer data Yt is calculated from question data X and function data Ft (X), and transmitted to antenna 22 as a data group of frequencies B and C. The amplifier circuit 21 converts the frequency data received by the antenna 22 into a data group of “1” and “0” and outputs the data group to the CPU 20a. In addition, as the function data Ft (X), for example, Ft (X) =
Four arithmetic operations such as (x ² + x) / 5 + X / 2 + x ^−1/2 +... Can be used.

The CPU 20a includes the transponder 1
0a and the function data Fe (X) (transponder 1) stored in the EEPROM 20f.
If 0a is a correct transponder, response data Ye is obtained from the same function data). And
The CPU 20a compares the two pieces of answer data Yt and Ye, and if they match, determines that the transponder is correct (the function data in the transponder 10a matches the function data stored in the EEPROM 20f) and starts the engine. Allow, but do not run the engine if there is a mismatch.

Next, the operation of the CPU 20a will be described with reference to the flowchart of FIG.
When the registration key 10 is inserted into the key cylinder and the key switch (IG switch) is turned on, the electric system shown in FIG.

First, a normal operation of starting the engine using the registration key 10 will be described. By turning on the power,
The excitation signal and the query data X are transmitted to the transponder 10a (step 101).
Function data Fe (X) stored in PROM 20f
To obtain answer data Ye (step 102), and read answer data Yt from transponder 10a (step 103).

Then, the two answer data Yt and Ye are compared to perform data collation (step 104). If the collation result matches and the key identification code described later matches, it is determined that the transponder is "correct transponder", and the ignition / injection engine is controlled through the registration mode determination (step 105, this processing will be described later). (Step 10
6). However, if they do not match, steps 101 to 1
When the number of mismatches reaches the predetermined number of times, the determination in step 107 becomes YES, the abnormal transponder is set, and the ignition / injection is prohibited from the outputs of the drive circuits 20g and 20h. After confirming this (step 108), control processing other than engine control (for example, processing for displaying an abnormality with an LED or the like) is executed (step 109). Therefore, in this case, the operation of the engine is not performed.

As can be seen from the above description, theft can be prevented by using the function data written in the transponder 10a of the registration key 10. Next, the case of registering a new key that duplicates the shape of the master key will be described. In this case, the registration key 10 is inserted into the key cylinder, the ECU 20 is operated, and the registration key 10 is confirmed. First, when the power is turned on by turning on the registration key 10,
The CPU 10a transmits the transponder 10a of the registration key 10.
It is determined whether the communication has been performed correctly (steps 101 to 104).

When it is determined that communication has been correctly performed,
After this determination, it is determined whether or not a registration operation for registering a new key has been performed within a predetermined period (for example, 10 seconds) (step 105). For example, the ON / OFF of the IG switch is set to 3
It is determined whether or not a predetermined registration operation has been performed, for example, the ON / OFF of the door switch has been performed four times. When such a registration operation is performed, registration of a new key can be set, and the registration mode process 200 is executed. When the starter is operated by the registration key 10, the determination in step 105 is NO, and the engine can be started immediately.

FIG. 3 shows a specific process of the registration mode process 200. After performing the above-described registration operation, the user inserts a new key in place of the registration key 10 into the key cylinder. At the time of this key exchange, the key switch is once turned off, so that the power supply holding process is first performed when the registration mode process is started (step 201). In this case, the power supply holding circuit (not shown) is operated to activate the ECU 20 for a predetermined time.
To maintain power supply to the

Thereafter, the CPU 10a confirms that the registration key 10 has been replaced with a new key (step 20).
2). For example, the key exchange can be confirmed using a key insertion switch (not shown) that detects the state of key insertion into the key cylinder. Next, an excitation signal is transmitted to the transponder of the new key, the transponder is made operable (step 203), and the function data Fe (X) stored in the EEPROM 20f is transmitted to the transponder of the new key. Function data Ft
(X) is written (step 204). Thereafter, the question data X is prepared, the answer data Ye is obtained from the function data Fe (X) stored in the EEPROM 20f (step 205), and the question data X is transmitted to the new key transponder. The answer data Yt based on the written function data Ft (X) is read (step 206).

Then, the two answer data Yt and Ye are compared to perform data collation (step 207). If the collation results match, the function data Ft is correctly stored in the new key.
Assuming that (X) has been written, the key identification code (key number) is written into the transponder of the new key (step 208), and the same key identification code is written into the EEPROM 20f (step 209). When a new key identification code is registered as a new key, a key having the same key identification code is not created, so that a key identification code that has never been used is set. For example, when a new key is added to a vehicle in which the key identification code is set to 1 to 5 in advance, 6, 7,...

Further, lock processing for writing a lock code to the transponder of the new key is performed so that data cannot be written (step 210). After this,
The user is notified that the new key has been registered by display means such as an LED (step 211). Thereafter, when it is confirmed that replacement with another new key has been performed within a predetermined time, the determination in step 212 becomes YES, and the registration processing after step 203 is performed on the new key.

If it is determined in step 207 that the data collation results are inconsistent, the user is informed that the new key has not been registered by display means such as an LED (step 213). Therefore, the user can check whether the new key has been registered by looking at the display on the display means such as the LED.

In the above steps 104 and 207, it has been described that data comparison is performed by comparing the two response data Yt and Ye. However, the key identification code written in the transponder is read out and the key identification code is stored in the EEPROM 20f. It is also determined whether or not it matches any of the stored key identification codes. When both the answer data and the key identification code match, it is assumed that the matching result matches.

FIG. 4 shows a master key 11 and a new key 1
., And the storage contents of the EEPROM 20f. Each of the new keys 12, 13,... Has a built-in transponder 12a, 13a,. EEP
One function data Fe (X) common to each key is stored in the ROM 20f. Therefore, the storage capacity can be made much smaller than when the function data Fe (X) is individually stored for a plurality of keys. Further, when preparing the answer data, the calculation in step 102 may be performed only for one type of function data, so that the processing load can be reduced. Also, EEPROM
In 20f, a master key 11, new keys 12, 13,...
, A key identification code is stored.

By storing the key identification code for each key in the EEPROM 20f, even if any key is lost, the key identification code corresponding to the key can be stored and erased from the EEPROM 20f. Even if a lost key is used, the key identification codes do not match, so that the vehicle can be prevented from being stolen. (Second Embodiment) In the above embodiment, the ECU 2
0 is faulty (for example, drive circuit 20g, 20h, etc. is faulty)
In such a case, the ECU 20 may be replaced with another ECU. In this case, unless the function data and the key identification code (hereinafter, referred to as function data, etc.) written in the registration key are also stored in the new ECU, the registration key cannot be used as before. .

However, since the registration key uses an encryption type transponder, it is not possible to read the written contents. In addition, the lock after writing prevents rewriting of function data and the like. For this reason, the contents written in the encryption transponder are read out, and the new E
A method of writing function data or the like to the CU or a method of setting function data or the like again with a new ECU cannot be used.

Therefore, in the present embodiment, the failed ECU
At 20, a collation using a registration key is performed, and when the collation results match, the function data and the like stored in the EEPROM 20f are written into a new ECU.
The registration key can be used for the new ECU 20 as before. FIG. 5 shows a configuration in which function data and the like stored in the EEPROM 20f of the failed ECU 20 are written to the new ECU 30.

The new ECU 30 is replaced by the failed ECU 20
And the components 30a to 30h shown in the figure.
It has. Further, the function data and the like stored in the EEPROM 20f of the failed ECU 20 are written to the EEPROM 30f of the new ECU 30 via the checker 40. This checker 40 originally has E
Check of CU, for example, reading of diagnostic code, R
It is used when performing an AM information search and the like, and is configured to execute a process of writing function data and the like to the new ECU 30 along with the processes.

FIG. 6 shows the CPU 20 of the ECU 20.
a shows the processing executed by the CPU 30a in the ECU 30 (both CPUs 20a and 30a execute the same processing). 2 and 3 shown in the first embodiment,
The difference is that steps 100, 110, 300, and 400 are added. Initially, an initial code is stored in the EEPROM as function data, and when the function data is stored using a registration key, the initial code is rewritten to the function data. Therefore, the EEPROM 20f stores not the initial code but the function data and the new EC.
An initial code is stored in the EEPROM 30f of the U30.

For this reason, when power is supplied to the ECUs 20 and 30 (power supply from a vehicle-mounted battery or power supply using an external power supply), the CP of the new ECU 30
In U30a, when the process reaches step 100, the determination is YES, and the process for writing function data 3 is performed.
00 (detailed processing is shown in FIG. 7), and the CPU 20a of the failed ECU 20 executes step 1
When the value reaches 00, the determination is NO, and the same collation processing of function data and the like as described in the first embodiment is performed. (A detailed process is shown in FIG. 8).

FIG. 9 shows the arithmetic processing performed by the checker 40. When power is supplied to the checker 40, the checker 40
It is determined whether the mode is the exchange mode (step 50).
1). The determination of the ECU replacement mode is performed based on whether or not the user operates a switch for ECU replacement (not shown). When the ECU exchange mode is not set, the original operation of the checker 40 is performed (step 51).
0) is in the ECU exchange mode, the CP
A request to read out function data or the like is output to U20a (step 502).

In response to a read request from the checker 40, the CPU 20a executes a function data read process 4 shown in FIG.
00, the function data and the like stored in the EEPROM 20f are read out and transmitted to the checker 40 (step 401). The checker 40 receives the function data and the like transmitted from the CPU 20a (step 50).
3) It is determined whether the function data or the like has been correctly read from the CPU 20a (step 504). If the data can be read correctly, a request for writing function data or the like is output to the CPU 30a to write the function data or the like (step 505).

When a write request is output from the checker 40, the CPU 30a transmits the function data and the like to the EEPROM.
It is stored in M30f (step 302). Thereafter, in order to confirm whether the function data or the like has been correctly written, the stored function data or the like is read from the EEPROM 30f and transmitted to the checker 40 (step 303). The checker 40 transmits the function data and the like transmitted from the CPU 30a to the CPU 20a (Step 506).

When the CPU 20a receives the function data and the like transmitted from the CPU 30a from the checker 40 (step 402), the CPU 20a stores the function data and the like in the EEPROM 20f.
(Step 403). If the collation results match, the information of writing OK is transmitted to the checker 40 (step 404), and the EEP
The function data and the like stored in the ROM 20f are deleted. If the collation results do not match, the information of write NG is transmitted to the checker 40 (step 406). The reason why the function data and the like stored in the EEPROM 20f are deleted is to avoid duplicating the ECU.

The checker 40 determines the transmission information from the CPU 20a (step 507), and when receiving the write OK information, transmits to the CPU 30a that the collation result is "match" (step 508). When the information of the writing NG is received, the information indicating that the collation result is “mismatch” is transmitted to the CPU 30a (step 50).
9).

The CPU 30a determines whether or not the information indicating the collation result from the checker 40 has been received (step 304). If the collation result is "match", the function data writing process is terminated. "", It is determined that the writing has failed, and the function code stored in the EEPROM 30f is cleared and the process is returned to the initial code (step 305). This is because the writing process cannot be performed again unless the function code is returned to the initial code.

As can be seen from the above description, according to the present embodiment, even if the ECU 20 fails, a new EC
Since the function data and the like stored in the EEPROM 20f of the failed ECU 20 can be written in the U30, the old key can be used for the new ECU 30. (Third Embodiment) In the above-described first embodiment, registration of a new key can be set if the registered keys are collated. However, when a new key is registered, the registration of the new key is performed in advance. The registration of a new key may be restricted on condition that the master key is collated. Hereinafter, the third embodiment will be described. In addition,
In the third embodiment, the registration key 10 that has been registered as a new key will be referred to as a subkey, and will be described separately from the master key.

FIG. 10 shows the CPU 2 in this embodiment.
0a shows a partial process. The configuration other than the processing shown in FIG. 10 is the same as that of the first embodiment. First
As in the embodiment, the process proceeds to step 104 in FIG. 2, and when it is determined by data collation that the collation results of the two answer data Yt and Ye match, and that the key identification codes also match, it is determined that the transponder is “correct transponder”. As shown in FIG. 10, based on the key identification code, it is determined whether the registration key inserted in the key cylinder is a master key or another subkey (step 104a). In this case, for example, a key corresponding to the key identification code registered first in the EEPROM 20f at the time of shipment of the vehicle is determined as a master key, and a key newly registered thereafter is determined from the key identification code as a sub-key. . The sub key is written as a key identification code different from the key identification code of the master key.

If it is determined in step 104a that the key is the master key, the process proceeds to the ignition / injection engine control process in step 106 through the registration mode determination process in step 105. When the sub key is identified, step 1 is directly executed from step 104a.
Shift to the processing of 06. As in this embodiment, by restricting the registration of a new key on condition that a master key registered in advance is registered at the time of registration of a new key, when renting a vehicle such as a rental car, a rental key is used as a sub key. By doing so, it is possible to prevent a new key from being registered illegally.

In the above, an example has been described in which a new key is registered as a sub-key when a new key is registered using master key collation. However, the present invention is not limited to this. It is of course possible to determine that a new key has been set for the master key or the sub key so that the new key can be selected and set. In the third embodiment, the authentication data (function data Ft (X)) of a plurality of keys registered and set for one ECU 20, that is, one vehicle are all the same, and the EEPRO
Although M20f is assumed to store one corresponding function data Fe (X), the present invention can be applied to a case where a plurality of original master keys are provided and each has different authentication data. Can be applied. In such a case, the same authentication data as the master key used for comparison at the time of new key registration may be written to the new key and registered, and a plurality of keys having the same authentication data are assigned differently for each key. The ECU 20 determines whether the master key or any other subkey is determined by the key identification code.
Is managed by

The present invention can be applied not only to a vehicle equipped with an engine as described above, but also to a vehicle having no engine such as an electric vehicle. For example, it can be applied to boats.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a specific process of a CPU 20a in FIG.

FIG. 3 is a flowchart showing a detailed process of a registration mode process 200 in FIG. 2;

FIG. 4 shows a master key 11, new keys 12, 13,.
FIG. 4 is a diagram showing a correspondence relationship with storage contents of an EEPROM 20f.

FIG. 5 is a configuration diagram showing a second embodiment of the present invention.

FIG. 6 is a flowchart showing specific processing of CPUs 20a and 30a in FIG.

FIG. 7 is a flowchart showing a function data writing process in FIG. 6;

FIG. 8 is a flowchart showing a function data reading process in FIG. 6;

FIG. 9 is a flowchart showing a process of a checker 40 in FIG. 5;

FIG. 10 illustrates a CPU 20a according to a third embodiment of the present invention.
5 is a flowchart showing a partial process of the first embodiment.

[Explanation of symbols]

10 registration key, 11 master key, 12, 13 new key, 10a, 11a, 12a, 13a transponder, 20 ECU, 20a CPU, 20f EEP
ROM.

Claims (13)

[Claims] 1. A new key (12, 13) having a transponder (12a, 13a) in which no authentication data is written.
13) is prepared, and the transponder (10) provided in the registration key (10) is prepared.
a) and the electronic control unit (20) having the anti-theft function are communicated to determine whether or not the communication is correctly performed. If it is determined that the communication is correctly performed, a new key is registered. When registration of a new key is set, communication is performed between the transponder provided for the new key and the electronic control unit, and authentication data of the registration key stored in the electronic control unit. Is written into the transponder of the new key. 2. A new key (12, 13) having a transponder (12a, 13a) in which no authentication data is written.
13) is prepared, and communication is performed between the transponder (11a) provided in the pre-registered master key (11) and the electronic control device (20) having the anti-theft function, and whether communication has been performed correctly. If it is determined that the communication has been performed correctly, registration of a new key can be set, and communication is performed between the transponder provided for the new key and the electronic control unit. A method of registering a new key in an anti-theft device, characterized in that authentication data matching the authentication data of the master key is written into the transponder of the new key. 3. The electronic control device stores a key identification code of the master key, and the electronic control device communicates with the master key to confirm the authentication data and the key identification code. 3. The method for registering a new key in the anti-theft device according to claim 2, wherein it is determined that communication has been correctly performed. 4. The method according to claim 3, wherein a key identification code different from the key identification code of the master key is written in the transponder of the new key, in addition to authentication data matching the authentication data of the master key. Registration method in the described anti-theft device. 5. The electronic control device stores the authentication data and the key identification code for each of a plurality of electronic keys to which the same authentication data as the authentication data is assigned, 5. The method of claim 4, wherein the registration of the new key can be set only when the key identification code is identified. 6. After the writing, a communication is performed between the transponder of the new key and the electronic control unit to check whether the authentication data is correctly written in the transponder of the new key. 6. The method for registering a new key in the anti-theft device according to claim 1, wherein a check result of the check is notified to a registration operator of the new key. 7. An electronic control unit (20) having storage means (20f) for storing authentication data of a registration key (10), the electronic control unit comprising: a transponder (10a) provided in the registration key; Communication between the storage device and the storage device, when it is determined that the comparison result between the authentication data stored in the storage device and the authentication data written in the transponder matches each other, the theft of the motor is enabled. The electronic control unit, when writing authentication data to a transponder (12a, 13a) provided for a new key (12, 13), performs communication with the transponder of the registration key, and On condition that the verification result of the authentication data stored in the storage means matches the authentication data written in the transponder of the registration key, Anti-theft device, characterized in that it is intended to permit the lump can. 8. The electronic control unit has means (104a) for determining that the registration key is a pre-registered master key (11), and determines that this means is the master key. The anti-theft device according to claim 7, wherein the writing is permitted on condition that the collation results match. 9. The electronic control device according to claim 1, wherein the electronic control unit determines that a registration operation for registering a new key has been performed.
The method according to claim 7, wherein said means determines that said registration operation has been performed, and performs said writing when said writing is permitted.
Or the antitheft device according to 8. 10. The electronic control unit has means (208, 209) for writing a key identification code of the new key in the transponder of the new key and the storage means, and checks the authentication data and the key identification code. 10. The engine according to claim 7, wherein the engine is started when the results match.
The anti-theft device described in (1). 11. The electronic control unit, after performing the writing, communicates with the transponder of the new key to check whether the authentication data has been correctly written to the new key. Means for informing the registration operator of the new key of the result (205 to 207, 211,
213), the anti-theft device according to any one of claims 7 to 10. 12. A storage unit (20f) for storing authentication data of a registration key (10), communicating with a transponder provided in an electronic key, and storing authentication data stored in said storage unit. An electronic control device that enables the operation of a theft prevention target when the result of the comparison with the authentication data written in the transponder matches, and performs communication with the transponder of the electronic key, First determining means (104) for determining whether or not the verification result of the authentication data stored in the means matches the authentication data written in the transponder; and a registration operation for registering a new key is performed. Second determination means (105) for determining whether or not the matching has been performed; and the first determination means determines that the collation results match, and the second determination means determines whether the registration has been performed. Means for writing authentication data to a transponder (12a, 13a) provided to the new key (12, 13) when it is determined that a recording operation has been performed, apparatus. 13. A storage means (20f) for storing authentication data of a registration key (10), communicating with a transponder provided in an electronic key, and storing the authentication data stored in said storage means. An electronic control unit configured to enable the operation of the anti-theft object when the collation result with the authentication data written in the transponder matches, and performs communication with the transponder of the electronic key. First determining means (104, 104a) for determining whether or not the key is a pre-registered master key; and second determining means for determining whether or not a registration operation for registering a new key has been performed. Determining means (105), when the first determining means determines that the key is the master key, and when the second determining means determines that the registration operation has been performed, An electronic control device, comprising: means (200) for writing authentication data that matches the authentication data of the master key into a transponder (12a, 13a) provided for the new key (12, 13).