JPH10100862A - Identification code judging device in immobi system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the identification code judging device in an immobi system, which can shorten judging process time for identification codes. SOLUTION: A CPU 5a reads out identification codes at the on-vehicle side, which are stored in a ROM 5b, in a reading order stored in a RAM 5c, the read-out identification codes are compared with identification codes IDk0 through IDk2 transmitted from keys 2, 3 and 4 so as to be judged whether or not the read-out identification codes coincide with the aforesaid transmitted codes. When it is judged by the CPU 5a that they coincide with those transmitted codes, an engine drive permission signal EA for enabling engine control is thereby generated by the CPU. For example, in the case of the key 3 most frequently used out of a plurality of the keys 2, 3 and 4, if only an identification code at the on-vehicle side for the identification code IDk1 of the key 3, is stored in the RAM 5c in advance so as to be compared first, judging process operations by the CPU 5a can be completed by one action, and a judging process can thereby be over for a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an identification code discriminating apparatus for an immobilizer system, and more particularly to a technique for speeding up identification code discriminating processing of an immobilizer system for preventing theft of a vehicle.

[0002]

2. Description of the Related Art Hitherto, an immobilization system has been proposed as a device for preventing theft of an automobile. This immobilizer system has a built-in transponder that oscillates an identification code registered in the key grip in advance. The identification code is an extremely complicated code for the purpose of preventing theft, and different identification codes are used for the master key and the spare key corresponding to the same automobile. On the other hand, the vehicle body is equipped with a controller (immobilizer ECU). When a master key or spare key with a built-in transponder is inserted into the key cylinder, the immobilizer ECU
Transmits an electromagnetic wave from the antenna coil provided on the key cylinder to the transponder. The transponder uses the energy of the electromagnetic wave to oscillate an identification code to the antenna coil. Immobili ECU
Is configured to input an identification code from the key via an antenna coil, and compare the identification code with respective identification codes of a master key and a spare key registered in advance in a predetermined order. For example, Immobil EC
U first performs a process of reading and comparing the identification code of the master key, and if they do not match, reading and comparing the identification code of the spare key. The immobilizer ECU performs comparison in a predetermined order, and when both codes match, permits the engine to be driven. Conversely, when both codes do not match to the end, the engine is not permitted to be driven. I have.

That is, the immobilizer ECU compares several types of pre-registered identification codes with the input identification code in the order of pre-registering, so that the master key and the spare key having different identification codes can be reliably compared and determined. can do.

[0004]

The identification code communicated between the key of the immobilizer system and the immobilizer ECU in both directions is becoming more and more complicated in order to improve the anti-theft property. For example, as a method, an electromagnetic wave transmitted from the immobilizer ECU to the key includes random number data, and the receiving transponder converts the identification code by a function stored in advance using the random number and transmits the converted code to the immobilizer ECU. On the other hand, the immobilizer ECU inversely converts the transmitted converted identification data using a function using a random number transmitted to a spare key or the like to obtain an identification code, and the identification code is determined by a master key or a spare key registered in advance. Is determined in order with the identification code of each key registered in advance.

However, the time required for the judgment process which has been complicated in this way takes about 100 to 200 milliseconds even if only one master key is used. If there are two spare keys, the entire system is required until the engine is driven. It takes a very long time of 1 second to 2 seconds. Therefore, there is a problem that the user always feels uncomfortable with the length of time until the engine is driven.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent a user from feeling uncomfortable in a vehicle equipped with an immobilizer system.
It is an object of the present invention to provide an identification code discriminating apparatus in an immobilization system capable of shortening the identification code discrimination processing time.

[0007]

According to the first aspect of the present invention, a first identification code transmitted from a plurality of transmission means and having the same content as an identification code different from each other is stored in advance as a vehicle-mounted identification code. Storage means; second storage means for storing the reading order of the plurality of vehicle-mounted identification codes stored in the first storage means; and identification code transmitted from any one of the plurality of transmission means. Receiving the on-board identification code stored in the first storage means in accordance with the read order stored in the second storage means, and comparing the read identification code with the identification code to determine whether or not they match. Control means for generating an engine drive permission signal for enabling control of the engine when the code determination means determines that they match,
The gist is that the second storage means includes a writing means for storing the next reading order.

According to a second aspect of the present invention, there is provided an identification code discriminating apparatus for an immobilizer system according to the first aspect,
The writing means, when the code determination means determines that they match, specifies the matched vehicle-side identification code as the first vehicle-side identification code in the next reading order and stores the same in the second storage means. And

According to a third aspect of the present invention, there is provided the identification code discriminating apparatus in the immobilizer system according to the first aspect,
The third transmitting means transmits a second identification code for opening the door different from each other, and stores in advance an identification code having the same content as the second identification code as a second vehicle-mounted identification code. When receiving the second identification code transmitted from the storage unit and any one of the plurality of transmission units, the second vehicle-mounted device stores the second identification code and the third storage unit in the third storage unit. A second code discriminating means for comparing the discrimination code with the side identification code and discriminating whether or not the two coincide with each other; When the second control means and the second code determination means determine that they match, the vehicle-mounted identification code stored in the first storage means of the transmission means corresponding to the matched second vehicle-mounted identification code. To Are summarized as further comprising a second writing means for storing the first designated as vehicle-side identification code the second storage means in the look out order.

According to the first aspect of the present invention, the code discriminating means reads the vehicle-mounted identification code stored in the first storage means in accordance with the reading order stored in the second storage means, and transmits the code from the transmitting means. It is compared with the identification code to determine whether they match. The control means generates an engine drive permission signal for enabling control of the engine when the code determination means determines that they match. Therefore, for example, when only one transmitting means is used among a plurality of transmitting means at all times, the vehicle-side identification code corresponding to the identification code of the one transmitting means is set to be the first comparison target. If the storing means is stored in the storage means of No. 2 by the writing means, the discriminating operation by the code discriminating means is completed in one time.
As a result, the determination processing of the code determination means is completed in a short time.

According to the second aspect of the present invention, the writing means writes the vehicle-side identification code of the transmitting means which has the highest probability of being used next after being used last in the second storage means. As a result, the probability that the discriminating process by the code discriminating means is completed once is increased, and the process can be completed in a short time.

According to the third aspect of the present invention, when the second code determining means determines the transmitting means used for unlocking the door, the second writing means stores the first storage of the transmitting means. The vehicle-mounted identification code stored in the means is designated as the first vehicle-mounted identification code in the reading order and stored in the second storage means. That is, the transmitting means used to open the door is most likely to be used continuously for starting the engine. Therefore, the probability that the discrimination processing operation by the code discrimination means is completed in one time is increased, and the operation can be completed in a short time.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing an immobilizer system for an automobile. The immobilizer system includes an automobile 1, a master key 2, and two spare keys 3 and 4 indicated by broken lines in FIG. Car 1 is an immobilizer ECU
5, transceiver 6, sensor 7, and fuel injection control device (EF
IEEC) 8.

The immobilizer ECU 5 is connected to the transceiver 6, outputs a signal including the random number α to the transceiver 6, and inputs an immobilizer code signal via the transceiver 6. The transceiver 6 includes an amplifier 6a and an antenna coil 6b disposed on the outer periphery of the key cylinder. The amplifier 6a converts a signal from the immobilizer ECU 5, converts the signal from the antenna coil 6b into an electromagnetic wave, and transmits the electromagnetic wave toward the antenna coils of the transponders 2a, 3a, and 4a of the keys 2, 3, and 4 inserted into a key cylinder (not shown). Has become. Also, the immobilizer ECU 5 is an EFI ECU 8
And outputs an engine drive permission signal EA to be described later to the EFIECU 8.

The master key 2 has a transponder 2a built in the grip portion. The spare key 3 has a transponder 3a built in the grip portion. The spare key 4 has a transponder 4a built in the grip portion. The transponders 2a, 3a, 4a are a central processing unit (CPU) 2
b, 3b, 4b, EEPROMs 2c, 3c, 4c, and an antenna coil (not shown).

The EEPROM 2c stores the key-side encryption code 3 of the master key 2 in addition to the control program of the CPU 2b.
0 is stored in advance. This key side encryption code 30
Is composed of a data processing code 30a and a fixed code 30b as shown in FIG. Data processing code 3
0a is configured as a function of 40 bits in the present embodiment, and the fixed code 30b is configured of 8 bits in the present embodiment.

The CPU 2b executes a key-side identification code generation process according to a control program stored in the EEPROM 2c. The CPU 2b calculates the random number α
This is performed based on a signal including

The CPU 2b has the key-side encryption code 30
Is read, and a 40-bit encryption code 30c is generated. This encryption code 3
The CPU 2b generates the immobilizer ECU 5 at that time.
This is done by the value of the random number α from. More specifically, the random number α is substituted into a data processing code 30a as a function consisting of 40 bits and processed into a 40-bit encryption code 30c. Accordingly, the encryption code 30c having a different value is processed according to the value of the random number at that time.

Next, the CPU 2b generates the encrypted code 3
0c and the fixed code 30b of the key-side encryption code 30 are read out, and the two codes 30c and 30b are combined to create the key-side identification code IDk0 of the master key 2. That is, as shown in FIG. 2, in this embodiment, the key-side identification code IDk0 of the master key 2 is composed of 48 bits, the lower 8 bits are composed of the fixed code 30b, and the upper 40 bits are processed. It is configured with an encrypted code 30c. Then, the CPU 2b transmits the generated key-side identification code IDk0 of the master key 2 to the antenna coil 6b of the immobilizer ECU 5 via its own antenna coil.

The transponders 3a and 4a of the other spare keys 3 and 4 have the same structure.
The data processing codes 31a, 32 are stored in the EPROMs 3c, 4c.
The key-side encryption codes 31 and 32 composed of a and fixed codes 31b and 32b are stored in advance. Then, the CPUs 3b and 4b transmit the data processing codes 31a and 32
a, the encryption codes 31c and 32c are created, and the created encryption codes 31c and 32c and the fixed codes 31b and 32c are created.
b to generate key-side identification codes IDk1 and IDk2 of the spare keys 3 and 4, respectively, and transmit them. In the present embodiment, the key-side encryption codes 30 to 3
2 data processing codes 30a to 32a and fixed code 3
0b to 32b have different values for each key.

The immobilizer ECU 5 includes a central processing unit (C)
PU) 5a, ROM 5b, RAM 5c, and input / output interface 5d. The ROM 5b stores, in addition to the control program, an immobilization encryption code 40 for the master key 2, an immobilization encryption code 41 for the first spare key 3, and an immobilization encryption code 42 for the second spare key 4 in advance. It is remembered. The immobilizer-side encryption code 40 of the master key 2 is set to a value that matches the key-side encryption code 30 of the master key 2 described above. or,
The immobilizer-side encryption code 41 of the first spare key 3 has the same value as the key-side encryption code 31 of the first spare key 3, and the immobilizer-side encryption code 42 of the second spare key 4 has the second Of the spare key 4 corresponding to the key-side encryption code 32 are set.

Therefore, each of the immobilizer-side encrypted codes 40 to 4
2 is a data processing code 40a as shown in FIG.
To 42a and fixed cords 40b to 42b. The data processing codes 40a to 42a are composed of 40 bits in the present embodiment, and are fixed codes 40b to 42b.
Is composed of 8 bits in the present embodiment.

The CPU 5a executes an immobilizer-side identification code creating process, a code discriminating process, and an immobilizer system canceling process according to a control program stored in the ROM 5b. The CPU 5a has a sensor 7 for detecting whether a key provided in the key cylinder is inserted.
And each process is executed based on the detection signal. In this embodiment, when the sensor 7 detects that a key has been inserted into a key cylinder, the sensor 7 transmits an electromagnetic wave including a random number α that is set at random to the transponder of the key, and performs the immobilization on the key used last time. An identification code creation process is executed, and then a code discrimination process is executed. The RAM 5c stores the keys (one of the master key 2, the spare key 3, and the spare key 4) inserted and used in the previous key cylinder, and the CPU.
The calculation processing result of 5a is temporarily stored,
The CPU 5a can know the key used last time.

The immobilizer-side identification code creation process is performed by the RO
The immobilizer-side identification code IDi0 for each of the keys 2 to 4 using the respective immobilizer-side encryption codes 40 to 42 stored in M5b.
.About.IDi2.

If the previously used key (one of the master key 2, spare key 3, and spare key 4) is, for example, the master key 2, the CPU 5a first searches for the previously used key stored in the RAM 5c. When it is determined that the key is the master key 2, the immobilizer-side identification code creating process is executed for the master key 2. In this immobilizer-side identification code creation processing, the CPU 5a
The data processing code 40a constituting the immobilizer-side encryption code 40 is read, and a 40-bit encryption code 40c is generated. This encryption code 40c is created by the CPU 5a
Is performed using the same random number α transmitted to the transponder 2a of the key 2 into which the key 2 is inserted. More specifically, the random number α is substituted into a data processing code 40a as a function consisting of 40 bits and processed into a 40-bit encryption code 40c. Therefore, the encryption code 40c having a different value is processed depending on the value of the random number α at each time.

Next, the CPU 5a creates the encrypted code 4
0c and the fixed code 40b of the immobilizer-side encryption code 40 are read out, and the two codes 40c and 40b are combined to create an immobilizer-side identification code IDi0. That is, as shown in FIG. 3, in the present embodiment, the immobilizer-side identification code IDi0
Is composed of 48 bits, the lower 8 bits are composed of the fixed code 40b, and the upper 40 bits are the encryption code 40c.
It consists of. And the CPU 5a
Is the immobilizer-side identification code I of the created master key 2.
Di0 is stored in the RAM 5c, and the immobilizer-side identification code creation process for the master key 2 is completed. If the previously used key is the spare key 3, the spare key 3 is similarly given priority and the immobilizer-side identification code creation process is executed to create the immobilizer-side identification code IDi1. When the previously used key is the spare key 4, the spare key 4 is similarly given priority and the immobilizer-side identification code creation processing is executed to create the immobilizer-side identification code IDi2.

Therefore, each key-side encrypted code 30 to 32 and each immobilized-side encrypted code 40 are used using the same random number α.
Key side identification code IDk0 to ID obtained from
The key identification code IDk0 and the immobilization-side identification code IDi0, the key-side identification code IDk1 and the immobilization-side identification code IDi1, the key-side identification code IDk2 and the immobilization-side identification code IDi2 respectively match k2 and the immobilization-side identification code IDi0 to IDi2. Value.

When the immobilizer-side identification code creating process for the previously used key is completed, the mode shifts to a code discriminating process for the key. The code discrimination processing is performed by the immobilization-side identification codes IDi0 to IDi2 created in the previous immobilization-side identification code creation processing and the key-side identification code IDk transmitted from the keys 2 to 4 inserted into the key cylinder.
This is a process of comparing with 0 to IDk2 to determine whether they match.

The key used last time is, for example, master key 2
If the key inserted into the key cylinder this time is the master key 2, the CPU 5a transmits the random number α and generates the immobilizer-side identification code IDi0 of the master key 2 created.
And the key-side identification code IDk0 input from the transceiver 6.
Compare. In this code discrimination processing, both codes I
When it is determined that Di0 and IDk0 match, the CPU 5a
Shifts to an immobilizer system release process described later, and stores that the last used key is the master key 2 in the RAM 5c.

If the previously used key is, for example, the master key 2 and the key inserted into the key cylinder this time is the spare key 3, the CPU 5a, as described above, uses the immobilizer-side identification code I generated for the previously used master key 2.
Di0 and the entered key-side identification code I of the spare key 3
Compare Dk1. When the CPU 5a determines that the codes IDi0 and IDk1 do not match in the code discrimination process, the CPU 5a immediately performs the immobilizer-side identification code creation process for the spare key 3 and creates the immobilizer-side identification code IDi1 of the spare key 3. Then, a code discriminating process is executed for the created immobilizer-side identification code IDi1 and the inputted key-side identification code IDk1 of the spare key 3, and
When the CPU 5a determines that the codes IDi1 and IDk1 match in the code determination process, the CPU 5a shifts to an immobilizer system release process, and stores in the RAM 5c that the last used key is the spare key 3.

Further, when the key used last time is, for example, the master key 2 and the key inserted into the key cylinder this time is the spare key 4, the CPU 5a determines the immobilizer-side identification code IDi0 created for the master key 2 used last time as described above. Then, the key identification code IDk2 of the input spare key 3 is compared. When the CPU 5a determines that the codes IDi0 and IDk2 do not match in the code discrimination process, the CPU 5a immediately performs the immobilizer-side identification code creation process for the spare key 3 and creates the immobilizer-side identification code IDi1 of the spare key 3. Then, a code discriminating process is executed for the created immobilizer-side identification code IDi1 and the inputted key-side identification code IDk2 of the spare key 4, and both codes IDi1, IDk2
When the CPU 5a determines that the spare key 4 does not match, the CPU 5a immediately performs the immobilizer-side identification code creation process for the spare key 4 and creates the immobilizer-side identification code IDi2 of the spare key 4. Then, a code discrimination process is executed for the created immobilizer-side identification code IDi2 and the inputted key-side identification code IDk2 of the spare key 4. If it is determined that the codes IDi2 and IDk2 match, the code C is determined.
The PU 5a proceeds to the immobilizer system release process, and stores in the RAM 5c that the last used key is the spare key 4.

Further, if the key used last time is, for example, the master key 2 and the key inserted into the key cylinder this time is not the keys 2, 3 and 4 registered in the ROM 5b in advance, the CPU 5a first proceeds to the previous The code discrimination process for the used master key 2, the code discrimination process for the spare key 3, and then the code discrimination process for the spare key 4 are executed, and if it is determined that they do not all match, the CPU 5 a shifts to the immobilizer system release process. do not do.

When the process proceeds to the immobilizer system release process, the CPU 5a continues to output the engine drive permission signal EA to the fuel injection control device (EFIECU) 8 until the keys 2, 3, and 4 are removed from the key cylinder.

The EFIECU 8 is a central processing unit (CP)
U) 8a, ROM 8b, RAM 8c, input / output interface 8d, and the like. The CPU 8a controls the start of the engine in accordance with the control program stored in the ROM 8b, and executes various arithmetic processing for calculating the injection amount and the injection timing of the fuel supplied to the engine and controlling the driving of the engine. I have. The RAM 8c temporarily stores the result of the arithmetic processing by the CPU 8a.

When the engine drive permission signal EA is output from the immobilizer ECU 5, the CPU 8a responds to an ON signal of an ignition key switch (not shown) to calculate an injection amount and an injection timing of the fuel supplied to the engine. To perform an operation process for controlling the driving of. When the immobilizer ECU 5 does not output the engine drive permission signal EA, the CPU 8a does not execute the above-described arithmetic processing for controlling the drive of the engine even if it inputs an ON signal of an ignition key switch (not shown). . In other words, immobility EC
When the engine drive permission signal EA is not output from U5, the engine is not driven and the automobile 1 does not move.

Next, the operation of the ID code processing system of the immobilizer system configured as described above in the code discriminating process will be described with reference to the flowchart shown in FIG.
For example, assuming that the previously used key is the spare key 3, when the user inserts the spare key 3 into the key cylinder, the sensor 7 detects it and outputs the information to the immobilizer ECU 5. When the CPU 5a of the immobilizer ECU 5 inputs the information through the input / output interface 5d in step 1, the process proceeds to step 2, outputs a signal including the random number α to the transceiver 6, and stores the signal in the RAM 5c in step 3. The immobilizer-side identification code creation processing is performed for the spare key 3 that is the previously used key, and the immobilizer-side identification code IDi1 of the spare key 3 is created. On the other hand, the transponder 3a of the spare key 3
When an electromagnetic wave including a random number α is input through its own antenna coil at step, a key-side identification code creation process is performed at step 12 to create a key-side identification code IDk1. When the key-side identification code IDk1 is created, the transponder 3a determines in step 13 the same code IDk1.
Oscillates from its own antenna coil to the antenna coil 6b of the transceiver 6.

When the CPU 5a inputs the key-side identification code IDk1 from the transceiver 6 in step 4, the CPU 5a proceeds to step 5 and performs a code discrimination process on the spare key 3 used last time. That is, in step 5, the created immobilizer-side identification code IDi1 is compared with the input key-side identification code IDk1. When it is determined that both codes IDi1 and IDk1 match, the CPU 5a immediately proceeds to step 6 where the engine drive enable signal E
A is output to the EFIECU 8, and at step 7, data indicating what key was used at that time is stored in the RAM 5c.

If it is determined in step 5 that the two codes do not match, the CPU 5a immediately determines in step 8 whether there is a key for which code generation processing has not been performed. Step 9
Then, an immobilizer-side identification code creation process is performed for the key, and the two codes are compared in step S5. If it is determined in step 8 that the code creation processing has been performed for all keys, it is determined that the keys do not match.

When the engine drive permission signal EA is input, the CPU 8a of the EFIECU 8 executes various arithmetic processes for controlling the drive of the engine in response to the ON signal of the ignition key switch. That is, the system first determines whether the input key-side identification code is correct for the previously used key.

Next, the features of the present embodiment configured as described above will be described below. (1) In the present embodiment, the RAM 5c of the immobilizer ECU 5
Is the key used last time (master key 2, spare key 3,
(One of the spare keys 4) is stored, and when it is determined whether or not the input key-side identification code is correct, first, the immobilizer-side identification code creation processing is performed preferentially for the previously used key. Code judgment processing is performed. Therefore, when the same key is used repeatedly, the key-side identification codes IDk0 and IDk1 can be used in a short time.
, IDk2 are correct.

(2) In this embodiment, the immobilizer ECU 5
Outputs an outgoing signal including the random number α to the transceiver 6, and stores the previously used key stored in the RAM 5c,
For example, the immobilizer-side identification code creation process is performed on the master key 2 and the immobilizer-side identification code IDi0 of the master key 2 is processed.
Create Therefore, the immobilizer-side identification code IDi0 can be created for the previously used key before the key-side identification code IDk0 from the master key 2 is input. The processing can be performed in a very short time.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 1 is a block diagram showing an immobilizer system of a vehicle. The immobilizer system is a vehicle 1 shown by a broken line in FIG.
1, a master key 12 and two spare keys 13 and 14.

The automobile 11 includes an immobilizer ECU 15, a transceiver 16, a sensor 17, and a fuel injection control device (EFIEC).
U) 18, radio key receiver 19 and door lock device D
Etc. are provided.

The immobilizer ECU 15 is connected to the transceiver 16, outputs a signal including the random number α to the transceiver 16, and inputs an immobilizer code signal via the transceiver 16. The transceiver 16 includes an amplifier 16a and an antenna coil 16b disposed on the outer periphery of the key cylinder. The amplifier 16a converts a signal from the immobilizer ECU 15, converts the signal into an electromagnetic wave from the antenna coil 16b, and converts the signal into a key cylinder (not shown).
The transmission is performed toward the antenna coils of the transponders 12a, 13a, and 14a.
The immobilizer ECU 5 is connected to the EFIECU 18 and outputs an engine drive permission signal EA to the EFIECU 18 as in the first embodiment. The radio key receiver 19 is connected to the door lock device D, and outputs a control signal to the door lock device D based on the received radio wave. The radio key receiver 19 is an immobilizer ECU 15.
And is connected to the immobilizer EC based on the received radio waves
A key recognition signal described later is output to U15.

The master key 12 has a transponder 12a built in the grip portion. The spare key 13 has a transponder 13a built in the grip portion. The spare key 14 has a transponder 14a built in the grip portion. The transponders 12a, 13a, 14a are connected to a central processing unit (CPU) 12b, 13b, 14b and an EEPROM.
OMs 12c, 13c, and 14c and an antenna coil (not shown) are provided. The master key 12 has a door lock on switch 12d and a door lock off switch 12e in the grip portion. The spare key 13 has a door lock on switch 13d and a door lock off switch 13e in the grip portion. The spare key 14 has a door lock on switch 14d and a door lock off switch 14e in the grip portion. In addition, master key 1
2. The spare key 13 and the spare key 14 each have a transmitter (not shown) that oscillates each signal based on each switch operation.

The EEPROM 12c stores a key-side encryption code 50 of the master key 12 in addition to the control program of the CPU 12b. The key-side encryption code 50 is composed of a data processing code 50a and a fixed code 50b as shown in FIG. The data processing code 50a is configured as a 40-bit function in the present embodiment, and the fixed code 50b is configured as 8 bits in the present embodiment.

The CPU 12b executes a key-side identification code generation process according to a control program stored in the EEPROM 12c. The CPU 12b is executed based on a signal including the random number α.

The CPU 12b executes the key-side encryption code 5
The data processing code 50a constituting 0 is read and 40
A bit encryption code 50c is generated. The creation of the encryption code 50c is performed by the CPU 12b based on the value of the random number α from the immobilizer ECU 15 at the time in the same manner as in the first embodiment.

Then, the CPU 12b determines the fixed code 50b of the created encryption code 50c and the key-side encryption code 50.
Is read out, and the two codes 50c and 50b are combined to form a key-side identification code IDk3 of the master key 12 as shown in FIG.
Create The CPU 12b transmits the created key-side identification code IDk3 of the master key 12 to the antenna coil 16b of the immobilizer ECU 15 via its own antenna coil.

The transponders 13a and 14a of the other spare keys 13 and 14 have the same configuration, and each EEPROM 13c and 14c has a key side composed of data processing codes 51a and 52a and fixed codes 51b and 52b. The encryption codes 51 and 52 are stored in advance. Then, the CPUs 13b and 14b create the encryption codes 51c and 52c from the data processing codes 51a and 52a, combine the created encryption codes 51c and 52c with the fixed codes 51b and 52b, and respectively generate the spare key 1c.
3, 14 key side identification codes IDk4 and IDk5 are created and transmitted. In the present embodiment, the data processing codes 50a to 50a of the key-side encryption codes 50 to 52 are used.
2a and the fixed codes 50b to 52b have different values for each key.

When the door lock on switch 12d of the master key 12 is pressed, the master key 12
When the lock-on signal 12X is oscillated at 9 and the door lock-off switch 12e is pressed, the master key 12 oscillates the lock-off signal 12Y to the radio key receiver 19. When the door lock-on switch 13d of the spare key 13 is pressed, the spare key 13 sends a lock-on signal 1 to the radio key receiver 19.
When 3X is oscillated and the door lock-off switch 13e is pressed, the spare key 13 oscillates a lock-off signal 13Y to the radio key receiver 19. When the door lock-on switch 14d of the spare key 14 is pressed, the spare key 14 oscillates a lock-on signal 14X to the radio key receiver 19, and when the door lock-off switch 14e is pressed, the spare key 14 outputs a lock-off signal 14Y to the radio key receiver 19. Oscillate. The lock-on signals 12X, 13X, 14X are signals for locking the door. Lock-off signal 1
Reference numerals 2Y, 13Y, and 14Y denote signals for unlocking the door.
A key identification code is included so that it is possible to determine which of the spare keys 13 and 14 is the key oscillated.

The radio key receiver 19 includes a central processing unit (CPU) 19a, a ROM 19b, a RAM 19c, an input / output interface 19d, a receiver 19e, and the like. The CPU 19a executes various arithmetic processes such as a signal discriminating process according to a control program stored in the ROM 19b. The ROM 19b stores various data such as a key identification code registered in advance for each key, in addition to the control program. RAM 19c is the CPU
The calculation processing result of 19a is temporarily stored.

The CPU 19a transmits the lock-on signals 12X, 13X, 14X and the lock-off signals 12Y, 12Y, 12X, 13X, and 14X transmitted from the keys 12, 13, and 14 via the receiver 19e.
13Y and 14Y are received. The CP
When U19a receives these signals, it executes signal discrimination processing. In the signal determination process, the CPU 19a outputs a control signal for locking the door to the door lock device D if the input signal is the lock-on signal 12X, 13X, 14X,
Lock the door.

If the input signal is the lock-off signal 12Y, the CPU 19a outputs a control signal for unlocking the door to the door lock device D to unlock the door, and the key identification code included in the lock-off signal 12Y. It recognizes that the signal is from the master key 12 and outputs a key identification signal 12Z to the immobilizer ECU 15. If the input signal is the lock-off signal 13Y, the CPU 19a outputs a control signal for unlocking the door to the door lock device D to unlock the door, and furthermore, the spare key 13 based on the key identification code included in the lock-off signal 13Y. , And outputs a key identification signal 13Z to the immobilizer ECU 15. If the input signal is the lock-off signal 14Y, the CPU 19a outputs a control signal for unlocking the door to the door lock device D to unlock the door, and the spare key 14 based on the key identification code included in the lock-off signal 14Y. From the key identification signal 14 to the immobilizer ECU 15.
Output Z. The key identification signals 12Z to 14Z are signals indicating which key of the keys 12 to 14 has opened the door by radio waves.

The immobilizer ECU 15 has a central processing unit (C
PU) 15a, ROM 15b, RAM 15c, input / output interface 15d, and the like. In the ROM 15b, in addition to the control program, an immobilizer encryption code 60 for the master key 12, an immobilizer encryption code 61 for the first spare key 13, and an immobilizer encryption code 62 for the spare key 14 are stored in advance. . RAM15
c is the key identification signal 12Z from the radio key receiver 19.
14Z and the result of the arithmetic processing by the CPU 15a are temporarily stored. The immobilizer-side encryption code 60 of the master key 12 is set to a value that matches the key-side encryption code 50 of the master key 12 described above. Further, the immobilizer-side encryption code 61 of the first spare key 13 has the same value as the key-side encryption code 51 of the first spare key 13, and the immobilizer-side encryption code 62 of the second spare key 14 has A value corresponding to the key-side encryption code 52 of the second spare key 14 is set.

Therefore, each of the immobilizer-side encrypted codes 60 to 6
2 is a data processing code 60a as shown in FIG.
62a and fixed cords 60b to 62b. The data processing codes 60a to 62a are composed of 40 bits in the present embodiment, and the fixed codes 60b to 62b
Is composed of 8 bits in the present embodiment. CPU
Reference numeral 15a executes an immobilizer-side identification code creating process, a code discriminating process, and an immobilizer system canceling process in accordance with a control program stored in the ROM 15b.
The CPU 15a is connected to a sensor 17 for detecting whether or not a key provided on the key cylinder is inserted, and executes each process based on the detection signal. In the present embodiment, when the sensor 17 detects that a key has been inserted into the key cylinder, an electromagnetic wave including a random number α that is set at random is transmitted to the transponder of the key, and a radio wave is transmitted when the vehicle 11 is boarded. Thus, the immobilizer-side identification code creation processing is executed for the key whose door has been opened, and then the code identification processing is executed.

The immobilizer-side identification code creation process is performed in accordance with the RO
The immobilizer-side identification code I for each key 12 to 14 using each immobilizer-side encryption code 60 to 62 stored in M15b.
The processing operation for creating Di3 to IDi5.

When the key (one of the master key 12, the spare key 13, and the spare key 14) for opening the door by radio waves at the time of boarding is, for example, the master key 12, the CPU 1
5a first searches for a key for opening the door stored in the RAM 15c, and when it is determined that the key is the master key 12, executes an immobilizer-side identification code creating process for the master key 12. In the immobilizer-side identification code creation process, the CPU 15a reads out the data processing code 60a constituting the immobilizer-side encryption code 60 of the master key 12, and generates a 40-bit encryption code 60c. The creation of the encryption code 60c is performed using the same random number α as the random number α transmitted to the transponder 12a of the key 12 into which the CPU 15a is inserted, in the same manner as in the first embodiment.

Then, the CPU 15a determines the fixed code 60 of the created encryption code 60c and the immobilizer-side encryption code 60.
b is read out, and both codes 60c and 60b are combined to obtain FIG.
The immobilizer-side identification code IDi3 is created as shown in FIG.
Then, the CPU 15a transmits the created master key 12
The immobilizer-side identification code IDi3 of the master key 12 is stored in the RAM 15c, and the immobilizer-side identification code creation processing of the master key 12 is terminated. The key that opened the door by radio waves was spare key 1.
In the case of No. 3, the immobilizer-side identification code creation processing is similarly executed with priority on the spare key 13 to create the immobilizer-side identification code IDi4. When the key whose door is opened by the radio wave is the spare key 14, similarly, the spare key 14 is given priority and the immobilizer-side identification code creation processing is executed to create the immobilizer-side identification code IDi5.

Therefore, each key-side encryption code 50 to 52 and each immobility-side encryption code 60 are used by using the same random number α.
Key side identification code IDk3 to ID obtained from
The key identification code IDk3 and the immobilization-side identification code IDi3, the key-side identification code IDk4 and the immobilization-side identification code IDi4, and the key-side identification code IDk5 and the immobilization-side identification code IDi5 respectively match k5 and the immobilization-side identification codes IDi3 to IDi5. Value.

When the immobilizer-side identification code creation process for the key whose door has been opened by radio waves is completed, the mode shifts to the code determination process for the key. The code discrimination process compares the immobilizer-side identification codes IDi3 to IDi5 created in the previous immobilizer-side identification code creation process with the key-side identification codes IDk3 to IDk5 transmitted from the keys 12 to 14 inserted into the key cylinders. Is a process of determining whether or not they match.

When the key whose door has been opened by radio waves is, for example, the master key 12 and the master key 12 is inserted into the key cylinder, the CPU 15a transmits a random number α and generates the immobilizer identification code IDi3 of the master key 12 and The key-side identification code IDk3 input from the transceiver 16 is compared. If the CPU 15a determines that the two codes IDi3 and IDk3 match in the code discrimination process, the CPU 15a proceeds to an immobilizer system release process described later.

If the key that opened the door by radio waves is, for example, the master key 12 and the key inserted into the key cylinder is the spare key 13, the CPU 15a creates the master key 12 that opens the door by radio waves as described above. The immobilizer-side identification code IDi3 and the input key-side identification code IDk4 of the spare key 13 are compared. In this code discriminating process, both codes IDi3,
If it is determined that the IDk4 does not match, the CPU 15a
Immediately performs the immobilizer-side identification code creation process for the spare key 13, and executes the immobilizer-side identification code I of the spare key 13.
Create Di4. Then, the CPU 15a executes a code discrimination process on the created immobilizer-side identification code IDi4 and the inputted key-side identification code IDk4 of the spare key 13. When the code discrimination process determines that the codes IDi4 and IDk4 match, the CPU 15a releases the immobilizer system. Move on to processing.

Further, if the key that opened the door by radio waves is, for example, the master key 12 and the key inserted into the key cylinder is the spare key 14, the CPU 15a transmits the master key 12 that opens the door by radio waves as described above.
Is compared with the key identification code IDk5 of the spare key 13 inputted. In this code discrimination processing, both codes IDi3
, IDk5 do not match, the CPU 1
5a immediately performs the immobilizer-side identification code creation process for the spare key 13 and creates the immobilizer-side identification code IDi4 of the spare key 13. Then, a code discriminating process is executed for the created immobilizer-side identification code IDi4 and the inputted key-side identification code IDk5 of the spare key 14. When the code discriminating process determines that the codes IDi4 and IDk5 do not match, the CPU 15a immediately proceeds to the spare key. The immobilizer-side identification code IDi5 of the spare key 14 is generated by performing an immobilizer-side identification code creation process for the spare key 14. Then, a code discrimination process is executed for the created immobilizer-side identification code IDi5 and the input key-side identification code IDk5 of the spare key 14, and when it is determined that both codes IDi5 and IDk5 match, C is determined.
The PU 15a shifts to immobilizer system release processing.

Further, for example, the master key 12 is used as a key for opening the door by radio waves, and the key inserted into the key cylinder is a key 1 registered in the ROM 15b in advance.
If it is not 2, 13, or 14, the CPU 15a first determines the master key 12 that has previously opened the door by radio waves, as described above.
Is performed, then the code determination process for the spare key 13 is performed, and then the code determination process for the spare key 14 is performed. If it is determined that they do not all match, the CPU 15a does not shift to the immobilizer system release process.

When the process is shifted to the immobilizer system release process, the CPU 15a continues to output the engine drive permission signal EA to the fuel injection control device (EFIECU) 18 until the keys 12, 13, 14 are removed from the key cylinder.

The EFIECU 18 is a central processing unit (C
PU) 18a, ROM 18b, RAM 18c, input / output interface 18d, and the like. The CPU 18a controls the start of the engine in accordance with the control program stored in the ROM 18b, and executes various arithmetic processing for calculating the injection amount and the injection timing of the fuel supplied to the engine and controlling the driving of the engine. I have.
The RAM 18c temporarily stores the result of the arithmetic processing by the CPU 18a.

When the engine drive permission signal EA is output from the immobilizer ECU 15, the CPU 18a calculates the injection amount and the injection timing of the fuel supplied to the engine in response to the ON signal of an ignition key switch (not shown). To perform an operation process for controlling the driving of. Also, the CPU 18a uses the immobilizer EC.
When the engine drive permission signal EA is not output from U15, even if an ON signal of an ignition key switch (not shown) is input, the above-described arithmetic processing for controlling the drive of the engine is not executed. That is, when the engine drive permission signal EA is not output from the immobilizer ECU 15, the engine is not driven and the automobile 11 does not move.

Next, the operation in the code discrimination processing of the ID code processing system of the immobilizer system configured as described above will be described with reference to the flowchart shown in FIG.
For example, if the user unlocks the door with the door lock-off switch 13e of the spare key 13, the CPU 15a inputs the key identification signal 13Z from the radio key receiver 19 via the input / output interface 15d in step 21, RAM 15c in step 22
To store the contents.

When the user inserts the spare key 13 into the key cylinder, the sensor 17
The detection signal is output to U15a. Immobilizer ECU15
When the CPU 15a inputs the detection signal via the input / output interface 15d in step 31, the process proceeds to step 32, in which the CPU 15a outputs a signal including the random number α to the transceiver 16, and in step 33, the RA
Based on the contents stored in M15c, an immobilizer-side identification code IDi4 of the spare key 13 is generated for the spare key 13. On the other hand, when the transponder 13a of the spare key 13 inputs an electromagnetic wave including the random number α through its own antenna coil in step 41, it performs a key-side identification code creation process in step 42 to create a key-side identification code IDk4. And
After generating the key-side identification code IDk4, the transponder 13a oscillates the code IDk4 from its own antenna coil to the antenna coil 16b of the transceiver 16 in step 43.

When the CPU 15a inputs the key-side identification code IDk4 from the transceiver 16 in step 34, the CPU 15a proceeds to step 35 and performs a code discrimination process on the spare key 13 whose door has been opened by radio waves. That is, in step 35, the created immobilizer-side identification code IDi4 is compared with the input key-side identification code IDk4. Then, when it is determined that both codes match,
Immediately, the CPU 15a outputs an engine drive permission signal EA to the EFIECU 18 in step 36.

When it is determined in step 35 that the two codes do not match, the CPU 15a immediately determines in step 37 whether there is any key for which code generation processing has not been performed. In step 38, immobilizer-side identification code creation processing is performed for the key, and in step 35, both codes are compared. If it is determined in step 37 that the code creation processing has been performed for all keys, it is determined that the keys do not match.

When the engine drive permission signal EA is input, the CPU 18a of the EFIECU 18 executes various arithmetic processes for controlling the drive of the engine in response to the ON signal of the ignition key switch. In other words, the system first determines whether or not the immobilized code ID is correct with respect to the radio key whose door has been opened.

Next, the features of the present embodiment configured as described above will be described below. (1) In the present embodiment, the RAM 1 of the immobilizer ECU 15
5c stores the radio key (one of the master key 12, the spare key 13, and the spare key 14) that opened the door. When it is determined whether the input key-side identification code is correct, first, the last door is opened. The immobilizer-side identification code creation processing is preferentially performed for the opened radio key, and the code determination processing is performed. Therefore, when using the radio key with the door open inserted in the key cylinder,
Key-side identification codes IDk3, IDk4, IDk in a short time
You can judge that 5 is correct.

(2) In this embodiment, the immobilizer ECU 1
5 outputs a signal including a random number α to the transceiver 16 and performs an immobilizer-side identification code creation process for the radio key stored in the RAM 15c with the door opened, thereby creating an immobilizer-side identification code IDi3, IDi4, IDi5. . Therefore, the immobilizer-side identification codes IDi3, IDi4, IDi5 for the radio key whose door was last opened before the key-side identification codes IDk3, IDk4, IDk5 are input from the keys 12, 13, 14 must be generated. When the door is opened with a radio key and the key is inserted into a key cylinder for use, the code discrimination processing can be performed in an extremely short time.

(3) In the present embodiment, the user performs an operation of opening the door with the radio key, thereby providing the immobilizer ECU.
Numeral 15 stores the key and performs the determination processing on the key with priority. Therefore, when the doors are opened with the radio keys 12, 13, and 14 to drive the engine, the immobilizer ECU can be operated without any special operation by the user.
Reference numeral 15 gives priority to the same key and can determine the immobilized code in a short time.

The present invention is not limited to the above embodiment, but may be implemented as follows. (1) In the first and second embodiments, the number of keys of the automobile is three, but the number of keys may be any number as long as the number is plural. The greater the number of keys, the longer the time shortened through the system and the greater the effectiveness of the system.

(2) In the first and second embodiments, the immobilizer ECUs 5 and 15 operate the immobilizer system until they are determined to be correct in the code discriminating process, and release the immobilizer system only when determined to be correct. After the engine was driven, the immobilization system was released until the code discrimination process determined that it was incorrect,
The immobilization system may be activated only when it is determined that the immobilization system is not correct.

(3) In the first and second embodiments, the 48-bit key-side identification codes IDk0 to IDk5
Are 40-bit processed encryption codes 30c to 32
c, 50c to 52c and 8-bit fixed code 30b to 3
2b, 50b to 52b. Immobility EC
U5 and 15 compare the 48-bit key-side identification codes IDk0 to IDk5 of all 48 bits of the keys in the predetermined order in the code discriminating process (the first key that was used last time or the key that last opened the door by the radio wave). It is going to do.

This is converted into an 8-bit fixed code 30b-3
2b, only 50b to 52b are transferred to the Immobili CPUs 5, 15 first.
Fixed code 40b previously registered in the ROMs 5b and 15b
To 42b, 60b to 62b in a predetermined order, and only the keys that match in this discrimination process are processed by the 40-bit encryption codes 30c to 32c, 50c.
It may be further determined whether or not .about.52c is correct. In this case, the fixed codes 30b to 32b, 5
It is not necessary to perform a comparison determination using the encryption codes 40c to 42c and 60c to 62c for keys other than the keys for which 0b to 52b are determined to be correct.

(4) In the second embodiment, the RAM 15c of the immobilizer ECU 15 stores the radio key (one of the master key 12, the spare key 13, and the spare key 14) with the door opened. The means for opening the door may be changed to a means for opening the door of another door control system such as a system for opening and closing using an IC card or a system for opening and closing by optical communication. In this case, it is necessary to provide a means for opening the door of the door control system for each transponder built-in key, and register a key identification code corresponding to each key in the means for opening each door.

(5) In the first and second embodiments, in the first embodiment, a code discriminating process is performed on a key used last time by giving priority to the key used in the first embodiment. Although the code discriminating process is performed on the radio key with the opened key being given priority, the system may be implemented simultaneously. In this case, after the door is opened with the radio key radio wave, the radio key that opened the door has priority, and if the key has not been opened from the key cylinder and the door has not been opened with the radio wave, the key previously removed from the key cylinder has priority Will do.

(6) In the first and second embodiments, the key-side identification codes IDk0 to IDk5 and the immobilization-side identification codes IDi0 to IDi5 are encryption codes 30c to 32c obtained by substituting a random number α into a function. 40c-42
c, 50c-52c, 60c-62c and fixed cord 30
b-32b, 40b-42b, 50b-52b, 60b
Although the codes consist of the codes consisting of .about.62b, any identification codes may be used as long as they are not codes that can be easily forged by a third party.

(7) In the first and second embodiments, the key-side identification codes IDk0 to IDk5 and the immobilization-side identification codes IDi0 to IDi5 are 40-bit data obtained by substituting a random number α into a 40-bit function. Encryption code 30
c-32c, 40c-42c, 50c-52c, 60c
~ 62c or 8-bit fixed code 30b ~ 32b,
Although a code composed of 40b to 42b, 50b to 52b, and 60b to 62b is used, any number of bits may be used as long as the number of bits is not easily forged.

(8) In the first embodiment, the immobilizer ECU 5 stores only the previously used key in the RAM 5c, and performs a priority determination process on the key. Among the keys other than the used keys, the time when the key was used is stored in the RAM 5c in the new order, and the key used last time is preferentially determined and if it is determined that it is different, the key used next time is determined. For example, the determination processing may be performed in the order of storage in the RAM 5c.

(9) In the second embodiment, the immobilizer ECU 15 stores only the radio key with the door opened in the RAM 15c.
, And the key is preferentially discriminated. However, the time when the key is used among the keys other than the radio key that opened the door is stored in the RAM 15c in the new order, and the door is opened. When it is determined that the radio key is different from the radio key, the radio key whose door has been opened two times before is determined.
The determination processing may be performed in the order stored in c.

(10) In the first embodiment, when the keys 2, 3, and 4 are inserted into the key cylinder, the immobilizer ECU 5 transmits the transponders 2a and 3 of the keys 2, 3, and 4.
The random number α is transmitted to the keys a, 4a and the immobilizer-side identification code generation processing is performed for the keys 2, 3, and 4 used last time. For example, the keys 2, 3, and 4 are removed from the key cylinder. Sometimes, the random number α is set in advance, and the immobilizer-side identification code generation process is performed in advance before the keys 2, 3, and 4 are inserted, and the immobilizer-side identification code I
Di0 to IDi2 may be created in advance. in this case,
When the keys 2, 3, and 4 are inserted into the key cylinder, there is no need for the immobilizer ECU 5 to perform complicated immobilizer-side identification code creation processing. Therefore, the determination processing time is further reduced.

(11) In the second embodiment, when the keys 12, 13, 14 are inserted into the key cylinders, the immobilizer ECU 15 transmits a random number α to the transponders 12a, 13a, 14a of the keys 12, 13, 14. When the door is opened by the radio waves of the spare keys 12, 13, and 14, a random number is generated. After α is set, the immobilizer-side identification codes IDi3 to IDi5 may be generated by performing the immobilizer-side identification code creation process before the keys 12, 13, and 14 are inserted into the key cylinders. In this case, when the keys 12, 13, and 14 are inserted into the key cylinders, the immobilizer ECU 15 does not need to perform complicated immobilizer-side identification code creation processing. Therefore, the determination processing time is further reduced.

(12) In each of the above embodiments, the transponder as the transmitting means is built in the ignition key, but the transmitting means for outputting the identification code like the transponder is mounted on the IC card for starting the engine. It may be.

Next, technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects. (1) The identification code discriminating apparatus in the immobilizer system according to claim 1, wherein the identification codes (IDk0 to IDk)
5) is composed of an encryption code (30c to 32c, 50c to 52c) converted using the input random number (α) and a fixed code (30b to 32b, 50b to 52b) not converted, and a code discriminating means (5a). , 15a) is one of the plurality of transmission means (2a to 4a, 12a to 14a).
Identification codes (IDk0 to IDk) transmitted from the
Dk5), when receiving the fixed code (30b
To 32b, 50b to 52b), fixed codes (40b to 4b) in the vehicle-side identification codes (IDi0 to IDi5).
2b, 60b to 62b), and when it is determined that they match, the fixed code (4) of the matching vehicle-side identification code (IDi0 to IDi5) is immediately determined.
0b-42b, 60b-62b) and the encryption code (40c) of the transmission means (2a-4a, 12a-14a).
An identification code discriminating device in an immobilizer system, which compares whether or not they match with each other.

Thus, the fixed codes 30b to 32b,
There is no need to compare and determine the encryption codes 40c to 42c and 60c to 62c for keys other than the keys for which 50b to 52b are determined to be correct. As a result, the determination process of the code determination unit can be completed in a short time.

[0093]

As described above in detail, according to the present invention, in an automobile equipped with an immobilizer system, it is possible to shorten the processing time for identification code discrimination, and to drive the engine so that the user does not feel uncomfortable. It has an excellent effect that can be made.

[Brief description of the drawings]

FIG. 1 is a block diagram of an immobilizer system according to a first embodiment.

FIG. 2 is an explanatory diagram for explaining a key-side encryption code.

FIG. 3 is an explanatory diagram for describing an immobilizer-side encryption code.

FIG. 4 is a flowchart illustrating a code determination process according to the first embodiment.

FIG. 5 is a block diagram of an immobilizer system according to a second embodiment.

FIG. 6 is an explanatory diagram for explaining a key-side encryption code.

FIG. 7 is an explanatory diagram for describing an immobilizer-side encryption code.

FIG. 8 is a flowchart illustrating a code determination process according to the second embodiment.

[Explanation of symbols]

2a-4a, 12a-14a ... transponder, 5a,
15a, 19a: CPU, 5b, 15b: ROM, 5
c, 15c RAM, 12Y to 14Y lock-off signal, IDk0 to IDk5 key-side identification code, IDi0
~ IDi5 ... Immobilizer-side identification code.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04L 9/00 673E

Claims (3)

[Claims] A plurality of transmission means (2a to 4a, 12a to
A first storage means (5b, 15b) for storing in advance as identification codes (IDi0 to IDi5) on the vehicle side, identification codes having the same contents as the identification codes (IDk0 to IDk5) different from each other transmitted from 14a); A second storage unit (5c, 15c) storing a reading order of the plurality of vehicle-side identification codes stored in the first storage unit (5b, 15b); and a plurality of transmitting units (2a to 4a, 12a to 12c). 14a), the identification code (I) transmitted from any one of the transmitting means.
Dk0 to IDk5), the in-vehicle identification codes (IDi0 to IDi5) stored in the first storage means (5b, 15b) are read in accordance with the reading order stored in the second storage means (5c, 15c). Code determining means (5a, 15a) for reading and comparing with the identification code to determine whether or not they match; and an engine for enabling control of the engine when the code determining means (5a, 15a) determines that they match. Control means (5a, 15a) for generating drive permission signal (EA)
An identification code discriminating device in an immobilizer system, comprising: a writing unit (5a, 15a) for storing a next reading order in the second storage unit (5c, 15c). 2. The identification code discriminating device in the immobilizer system according to claim 1, wherein said writing means (5a, 15a) determines that said code discriminating means (5a, 15a) matches, and that the in-vehicle matches. The vehicle-side identification code (IDi0 to IDi5) is stored in the next reading order in the first vehicle-side identification code (IDi0 to IDi0).
~ IDi5) and the second storage means (5c,
15c) An identification code discriminating device in an immobilizer system, wherein the identification code is stored in 15c). 3. The identification code discriminating device in the immobilizer system according to claim 1, wherein the plurality of transmitting means (12a to 14a) are different door opening second identification codes (12Y to 14Y).
Y), third storage means (19b) for storing in advance an identification code having the same content as the second identification code (12Y to 14Y) as a second vehicle-side identification code, and the plurality of transmission means. (12a to 14a) transmitted from any one of the second identification codes (12Y to 12Y).
14Y), the second identification code (12Y)
-14Y) and the second vehicle-side identification code stored in the third storage means (19b), and a second code determination means (19a) for determining whether or not they match each other; When the determination means (19a) determines that they match, the second control means (19a) for generating a door lock release signal for releasing the door lock and the second code determination means (19a) match. Then, the vehicle-mounted identification codes (IDi0 to IDi0-I) stored in the first storage means (15b) of the transmitting means (12a to 14a) corresponding to the matched second vehicle-mounted identification code.
Di5) is designated as the first vehicle-side identification code (IDi0 to IDi5) in the reading order, and an identification code in an immobilization system including second writing means (19a) to be stored in the second storage means (15c). Discriminator.