JP2008149744A - Anti-theft system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the time for authentication at the time of start-up of an engine in an anti-theft system for a vehicle, and to complicate invalidation of the anti-theft system by part replacement. <P>SOLUTION: This anti-theft device S selects at least one vehicle device B randomly out of vehicle devices A-E at the time of registration of an identification code ID, and then, registers the identification code ID to the selected vehicle device B. At the time of authentication of the ID, it performs authentication between the selected vehicle device B and itself, and allows the start-up of a driving source 17 when the ID is authenticated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle antitheft system that prevents a vehicle from being stolen by an unauthorized engine start operation by a malicious third party.

  2. Description of the Related Art Conventionally, a vehicle antitheft system (also referred to as an immobilizer system) is known as a system for preventing theft of a vehicle due to an illegal engine start operation.

  This vehicle anti-theft system permits the engine to be started when the authentication code is authenticated through communication between an ignition key with a built-in communication device and an in-vehicle anti-theft device (immobilizer ECU: Electronic Control Unit). It is configured as follows.

  However, in this vehicle antitheft system, when the ignition key and the immobilizer ECU are exchanged together by a malicious third party, the start of the engine is permitted by the exchanged ignition key and the antitheft ( There is a problem that the anti-theft property is low.

  In order to enhance the anti-theft property, the authentication code is also registered in the meter ECU and the air conditioner ECU, which are other control devices (ECUs) connected to the immobilizer ECU via a communication line, and the ignition key and the immobilizer ECU An anti-theft system has been proposed that allows the engine to be started on the condition that the authentication between the immobilizer ECU, the meter ECU, and the air conditioner ECU can be performed when the authentication between the immobilizer ECU, the meter ECU, and the air conditioner ECU is obtained. Patent Document 1).

  In this anti-theft system, when the ignition key and the immobilizer ECU are replaced together, authentication can be obtained between the replaced ignition key and the immobilizer ECU, but the replaced immobilizer ECU and the unreplaced meter ECU and air conditioner Since authentication cannot be obtained with the ECU, engine start is not permitted and anti-theft performance is high.

  However, in the anti-theft system according to Patent Document 1, it takes a long time to perform the authentication process between a large number of ECUs, and the time from the ignition key rotation operation (on-trigger generation) to the engine start becomes long. , The user may feel uncomfortable.

  In order to solve this problem, all other ECUs such as a meter ECU, an air conditioner ECU, an air bag ECU, an ABS (Antilock Breaking System) ECU, and a tire pressure monitor ECU are used as an engine ECU that also serves as an immobilizer ECU. A unique authentication code such as a serial number is registered (stored) in advance. When the authentication between the engine ECU and the ignition key is obtained, at least one of the registered ECUs is randomly selected by the in-vehicle device random selection unit in the engine ECU, and the randomly selected ECU and authentication code are selected. An anti-theft system has been proposed that performs an authentication operation using the system and permits the start of the engine when this authentication is obtained (Patent Document 2).

  In the anti-theft system according to Patent Document 2, the number of ECUs to be authenticated that actually perform authentication communication is smaller than the number of ECUs to be authenticated in the anti-theft system according to Patent Document 1, so the authentication time is shortened. It is supposed to be possible.

Japanese Patent Laid-Open No. 10-238444 JP 2004-359036 A (FIG. 4)

  However, in the anti-theft system described in Patent Document 2, it is necessary to register (store) an authentication code unique to each of all the ECUs mounted on the vehicle mounted with the engine ECU in advance. In addition, since it is necessary to operate the on-vehicle device random selection unit incorporated in the engine ECU every time the engine is started, the burden on the engine ECU (data capacity and processing amount at the time of starting, that is, when the antitheft system is released) There is a problem that is large.

  Moreover, in the antitheft system for vehicles described in Patent Document 2, when adding an in-vehicle control device (equipment), it is necessary to update the registered content of the engine ECU, which makes it difficult to add the equipment. There is also a problem.

  The present invention has been made in consideration of such problems, and while maintaining the authentication time at the time of starting the drive source short, the data capacity and the data processing amount at the time of releasing the antitheft system are small, and the in-vehicle control device (equipment) It is an object of the present invention to provide a vehicle antitheft system that can be easily added, and in which the antitheft system cannot be easily disabled by replacing parts.

  The vehicle antitheft system according to the first aspect of the present invention is connected to the first control device that performs authentication by collating the authentication code and controls the start of the drive source, and the first control device via in-vehicle communication, And a plurality of second control devices capable of registering the authentication code, wherein the first control device includes a plurality of second control devices when the authentication code is registered. , Randomly selecting at least one second control device, registering the authentication code to the selected second control device, and at the time of authentication of the authentication code, between the selected second control device and Authentication is performed, and starting of the drive source is permitted when authentication is obtained.

  Here, the drive source includes an engine that is an internal combustion engine of the vehicle, a motor for driving the vehicle, a fuel cell of the fuel cell vehicle, and the like.

  According to the first invention, the first control device performs authentication with the specific second control device already selected when the drive source is started, that is, when the authentication code is authenticated. Since the start of the drive source is permitted when it is taken, the authentication time can be shortened. Moreover, since the 1st control apparatus should just have memorize | stored the identification code and authentication code of the 2nd control apparatus selected as a minimum, data capacity decreases. Further, at the time of authentication (when the antitheft system is released), since it is not necessary to operate the selection unit as in Patent Document 2, the data processing amount is also small. In addition, since it is not necessary to change the registered contents of the first control device for authentication when adding equipment, it is easy to add equipment.

  In addition, the probability of invalidation of the anti-theft system by replacing parts of a malicious third party can be reduced. Even if the first control device and the second control device are exchanged at the same time, the probability that authentication cannot be obtained is extremely high, and as a result, it becomes difficult to invalidate the anti-theft system by replacing parts.

  Furthermore, at the time of registration, it is only necessary to target the second control device connected to the first control device via in-vehicle communication at the time of registration, so that the registration work of the authentication code is easy.

  The vehicle antitheft system according to the second aspect of the invention is connected to the first control device that performs authentication by collating the authentication code and controls the start of the drive source, and the first control device via in-vehicle communication. And a plurality of second control devices each capable of registering the authentication code, wherein the first control device is configured to register the plurality of second control devices when the authentication code is registered. The fact that an authentication code has been registered in at least one second control device selected at random by an external registration machine is stored, and when the authentication code is authenticated, the authentication code is registered with the selected second control device. And the start of the drive source is permitted when the authentication is obtained.

  According to the second invention, in addition to achieving the effect of the first invention, among the functions of the first control device, at least one of the plurality of second control devices when registering the authentication code. Since the function of randomly selecting the two control devices becomes unnecessary, the configuration of the first control device becomes simpler.

  In the third invention having the features of the first or second invention, the first control device may perform the other ones other than the second control device in which the authentication code is registered when the authentication code is authenticated. (2) When a response related to authentication is received from the control device, the drive source cannot be started.

  According to the third invention, when a malicious third party exchanges parts of the first control device and the second control device in which the authentication code is not registered, the second control in which the authentication code is not registered. When a response is received from the device, the drive source cannot be started, so that it becomes more difficult to invalidate the anti-theft system by replacing parts.

  According to the present invention, while maintaining the authentication time at the time of starting the drive source (when releasing the anti-theft system), the data capacity and the data processing amount are small, and the addition of the in-vehicle control device (equipment) can be easily handled. In addition, it becomes difficult to invalidate the anti-theft system by replacing parts. Therefore, the anti-theft property of the vehicle is improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an anti-theft system 10 according to an embodiment of the present invention mounted on a vehicle (not shown).

  The anti-theft system 10 includes an anti-theft device S as a first control device, and the anti-theft device S includes a plurality of communication lines 12 such as in-vehicle communication (CAN (Car Area Network)). It is connected so as to be communicable with vehicle devices (in-vehicle devices) A, B, C, D, and E which are second control apparatuses. Vehicle devices A to E refer to vehicle-mounted control devices (equipment) such as the meter ECU, air conditioner ECU, and air bag ECU described above.

  A connector 15 is attached to the communication line 12. For example, the vehicle devices A to E and the antitheft device S connected to the communication line 12 are connected to the connector 15 before shipping the vehicle to the factory. A tester (line end tester) 14 which is a test device for testing / inspecting the control device is connected. The tester 14 can also be connected at a maintenance factory such as a dealer. Therefore, the present invention can also be implemented in a maintenance factory such as a dealer having the tester 14.

  The antitheft device S is connected to the vehicle devices A to E and the tester 14 via the communication line 12 and is configured to be able to communicate with an electronic key K such as an ignition key. Since the electronic key K also functions as a user recognition function, authentication using the electronic key K can be replaced with biometric authentication for authenticating a fingerprint, a face, and the like. Further, the anti-theft device S is connected to the drive source ECU 16 and the alarm device 18. The drive source ECU 16 starts and controls the drive of a drive source 17 such as an engine that is an internal combustion engine. In addition to the engine, the drive source 17 corresponds to a vehicle driving motor, a fuel cell such as a fuel cell vehicle, and the like.

  The anti-theft device S is provided with a registration area 21 for a communication device that performs authentication communication and a registration area 22 for a unique authentication code ID. Further, the anti-theft device S incorporates a random number generator 23 for generating a random number Rd for authentication and a random number for selecting a vehicle device, and further for authentication using a random number Rd for authentication and an authentication code ID as variables. A storage unit 24 for the function f (Rd, ID) is provided.

  Further, the vehicle devices A to E that are candidates for the authentication of the anti-theft device S include the same authentication function f (Rd, ID) storage units 41 to 45 and the above authentication code ID or dummy code. Registration areas 31 to 35 capable of registering DC are provided.

  The anti-theft device S, the vehicle devices A to E, and the drive source ECU 16 are each configured by an ECU including a CPU, a ROM, and a RAM, and the CPU executes programs stored in the ROM as various function realizing means. Operate.

  The registration areas 21, 22, 31 to 35 and the storage units 24 and 41 to 45 are configured by an electrically rewritable EEPROM or an electrically writable ROM.

  Before the tester 14 is connected before shipment from the factory, in other words, at the time of incorporation into the anti-theft device S in the vehicle, as shown in FIG. In the communication device, the electronic key K is registered in one of the registration areas {(K), ()} 21 ((K)), and the other one of the communication devices (vehicle devices A to E). ) Is not registered and is empty (()). Further, as shown in FIG. 1, in this embodiment, the authentication code ID is registered only in the registration area 22 of the antitheft device S (denoted as “ID” in the figure), and the authentication code is registered. Before, nothing is registered in the registration areas 31 to 35 of the vehicle devices A to E (in the figure, nothing is described in the squares of the registration areas 31 to 35). .

  The anti-theft system 10 according to this embodiment is basically configured as described above, and the operation thereof will be described with reference to a flowchart.

  FIG. 2 shows that the anti-theft device S is executed when the production line is output (when the anti-theft device S and the vehicle devices A to E are installed in the vehicle), etc., and selects the communication device (vehicle device) to be authenticated. FIG. 6 is a flowchart for explaining an operation when registering an authentication code in a selected vehicle device.

  At this time, first, the tester 14 is connected via the connector 15 of the communication line 12 of the vehicle. In step S1, when the anti-theft device S receives a command to incorporate the anti-theft system from the tester 14, the anti-theft device S is selected in step S2 in order to select a vehicle device for authentication communication. Recognizes all vehicle devices A to E connected to the communication line 12 and calculates the total number, in this case “5”. In addition, by having the process (means) for confirming the vehicle device connected to the communication line 12 in step S2, the anti-theft system 10 can be used even in vehicles with different vehicle devices connected to the communication line 12. Can be applied.

  Next, in step S3, the anti-theft device S has values 0, 1, 2, 3, 4 (for example, 0 is A, 1 is B, 2 is 2) corresponding to the total number “5” by the random number generator 23. In C, 3 corresponds to D, and 4 corresponds to E.), an arbitrary numerical value is generated (shuffled), and a vehicle device corresponding to the generated numerical value is selected. Here, it is assumed that the vehicle device B is selected at random. At this time, the identification code of the vehicle device B (here, Ba for convenience of understanding) is registered in the other registration area 21 of the communication device of the anti-theft device S. The registration area {(K), ()} 21 (FIG. 1) is the registration area {(K), (Ba)} 21 (FIG. 3).

  Next, in step S4, authentication communication including transmission / reception of registration information with the selected vehicle device B is performed.

  In this step S4, first, the same authentication code ID as the authentication code ID registered in the registration area 22 of the antitheft device S is registered in the authentication code registration area 32 of the selected vehicle device B. Next, an arbitrary random number Rd is generated by the random number generator 23, transmitted to the vehicle device B, and calculated by substituting it into the authentication function f (Rd, ID) stored in its own storage unit 24. Holds the result (denoted x). In the authentication function f (Rd, ID), the authentication code ID read from its own registration area 22 is substituted for the variable ID.

  On the other hand, the vehicle device B that has received the random number Rd substitutes the authentication function f (Rd, ID) in the storage unit 42 for calculation, and sends the calculation result (denoted y) to the anti-theft device S. In this case, in the authentication function f (Rd, ID), the authentication code ID read from the self registration area 32 is substituted for the variable ID.

  The antitheft device S collates the calculation result y sent from the vehicle device B with its own calculation result x, and determines that the authentication has been obtained if x = y.

  Next, in step S5, a specific dummy code (here, referred to as no response code) is registered in the registration areas 31, 33 to 35 of the vehicle devices A and C to E other than the selected vehicle device B. . After registering the dummy code DC, authentication communication is performed with the vehicle devices A, C to E, and it is confirmed that there is no response for a predetermined time. This specific dummy code is also stored in the anti-theft device S.

  An arbitrary code may be registered instead of a specific dummy code, and nothing need be registered. The process of step S5 is a step for improving the anti-theft property and can be omitted.

  Thereafter, the tester 14 is removed from the connector 15 and the process for registering the authentication code is completed. That is, the anti-theft system is set.

  FIG. 3 schematically shows the configuration of the anti-theft system 10A after code registration in the registration areas 21, 31 to 35 after executing the flowchart of FIG.

  As shown in FIG. 3, in addition to the electric key K, the identification code Ba of the vehicle device B is registered in the registration area 21 of the communication device that performs authentication communication of the anti-theft device S, and the vehicle device B selected at random. The same authentication code ID registered in the anti-theft device S is registered in the registration area 22, and the registration areas 31 and 33 to 35 of the remaining vehicle devices A and C to E are registered from the anti-theft device S. A dummy code (no response code) DC indicating that no reply is made to the inquiry communication at the time of authentication is registered.

  In the lower part of FIG. 3, in selecting a communication device, vehicle 1 has been selected for vehicle 1, vehicle device D has been selected for vehicle 2, and vehicle device E has been selected for vehicle 3. The respective identification codes Aa, Da, and Ea to be shown are registered in the registration area 21.

  Next, an operation during authentication of the authentication code executed when the antitheft system 10A is released to start the drive source 17 will be described with reference to the flowchart of FIG.

  In step S11, when the anti-theft device S receives an on-trigger from the electronic key K, the anti-theft device S checks whether it can be authenticated with the electronic key K. If the authentication is successful, the random number generator 23 selects an arbitrary value in step S12. Is generated, and a command is sent to all the vehicle devices A to E via the communication line 12 to send the calculation result, and the authentication function f (Rd, The calculation is performed by substituting the random number Rd and the authentication code ID into (ID), and the calculation result (x) is held.

  Next, in step S <b> 13, the vehicle device B that has received the random number Rd substitutes the authentication function f (Rd, ID) in the storage unit 42 for calculation, and sends the calculation result y to the anti-theft device S. The anti-theft device S compares the calculation result y sent from the vehicle device B with its own calculation result x, and if x = y, determines that the authentication has been obtained.

  Next, in step S14, it is determined whether or not there is a response from the vehicle devices A, C to E other than the selected vehicle device B. In this case, other normal vehicle devices A, C to E in which the dummy code DC of the non-response code is stored in the registration areas 31, 33 to 35, when the random number Rd is received, Does not respond.

  When the determination in step S14 is negative for a predetermined time, the anti-theft system is released in step S15, the drive source ECU 16 is given permission to start the drive source 17, and the drive source 17 is started through the drive source ECU 16. .

  On the other hand, if the authentication with the electronic key K is not obtained in step S1, or if the authentication with the vehicle device B selected in step S13 is not obtained, the vehicle devices A other than the vehicle device B selected in step S14. If there is a response from C to E, in step S16, without giving permission to start the drive source ECU 16, the warning device 18 is used to warn or warn that the authentication has failed. In this way, the operation at the time of authentication ends.

  Next, the operation from the system release to the system set of the antitheft system 10A performed in step S15 will be described with reference to the flowchart of FIG.

  When the system setting precondition is satisfied in step S21 in the system release state in step S15, specifically, when the anti-theft device S receives an off trigger for the electronic key K, in step S22, Check the communication status. That is, communication confirmation with the vehicle devices A to E is performed via the communication line 12. If the confirmation of in-vehicle communication is OK in step S23, the antitheft system 10A is set in step S27. That is, the state immediately before step S11 in FIG. 4 is restored.

  In step S23, if the confirmation of in-vehicle communication is NG, in step S24, the alarm device 18 warns or warns that the vehicle devices A to E in the in-vehicle communication confirmation are NG.

  Next, in step S25, it is determined whether or not the inoperative vehicle devices A to E are selected vehicle devices B. If not, the antitheft system 10A is set in step S27.

  If the inoperative vehicle devices A to E are selected vehicle devices B in step S25, a setting for bypassing authentication with the vehicle device B is performed, and the antitheft system 10A is set in step S27. .

  As described above, according to the above-described embodiment, the anti-theft system 10A includes the anti-theft device S as the first control device that performs authentication by checking the authentication code ID and controls the start of the drive source 17, and the anti-theft. The anti-theft device S is registered with the authentication code ID, and includes five vehicle devices A to E as the second control devices that are connected to the device S via the communication line 12 and can register the authentication code ID. Sometimes, at least one vehicle device B is randomly selected among the vehicle devices A to E, an authentication code ID is registered for the selected vehicle device B, and when the authentication code ID is authenticated, Authentication is performed, and the start of the drive source 17 is permitted when the authentication is obtained.

  As described above, the anti-theft device S performs authentication with the specific vehicle device B that has already been selected when the drive source 17 is started, that is, when the authentication code ID is authenticated. Since the start of the drive source 17 is allowed to be, the authentication time can be shortened. Further, the anti-theft device S only needs to store at least the identification code Ba of the selected vehicle device B and the authentication code ID, so the data capacity is reduced. Further, as in Patent Document 2, since it is not necessary to operate the selection unit at the time of authentication, the data processing amount is also small. Further, when adding equipment, it is only necessary to connect the vehicle device having the dummy code DC stored in the registration area to the communication line 12, and it is not necessary to change the anti-theft device S for authentication, so addition of equipment is easy. .

  Furthermore, at the time of registration of the authentication code ID, it is only necessary to target the vehicle devices A to E connected to the anti-theft device S via the communication line 12 at the time of registration, so that the registration work of the authentication code ID is easy. .

  Furthermore, when registering the authentication code ID, the anti-theft device S (and a tester 14A described later) checks the vehicle device connected to the communication line 12, so that the anti-theft system 10 The present invention can also be applied to vehicles having different numbers and types of vehicle devices connected to the line 12.

  Furthermore, it is possible to increase the probability of invalidation of the anti-theft system 10A by replacing parts of a malicious third party. Even if one of the anti-theft devices S and the vehicle devices A, C to E that are not selected by a malicious third party is exchanged at the same time, authentication cannot be obtained. Invalidation becomes difficult. In fact, there are many commercial vehicles equipped with more than five vehicle devices, and it is extremely difficult for a malicious third party to specify the selected vehicle device B.

  Furthermore, when the anti-theft device S receives a response related to authentication from other vehicle devices A, C to E other than the vehicle device B in which the authentication code ID is registered when the authentication code ID is authenticated, Since the drive source 17 cannot be started, it is more difficult to invalidate the anti-theft system 10 by replacing parts.

  Therefore, according to this embodiment, the authentication time at the time of starting the drive source 17 is kept short, the data capacity and the data processing amount are small, the addition of the vehicle device can be easily handled, and theft prevention by parts replacement is prevented. It is possible to provide an anti-theft system 10, 10A that makes it difficult to invalidate the system 10.

  In the above-described embodiment, the authentication code ID is registered and the vehicle devices A to E to be certified are selected by the anti-theft device S. However, as another embodiment of the present invention, the authentication code ID is used. And the selection of the vehicle devices A to E to be certified can be performed by the tester 14 which is an external registration machine.

  Another embodiment will be described with reference to the flowchart of FIG. FIG. 6 is a flowchart executed by the tester 14 at the time of registration of the authentication code (when incorporated in the vehicle).

  FIG. 7 is a block diagram showing a configuration of an anti-theft system 10B according to another embodiment. The anti-theft system 10B differs from the anti-theft system 10 shown in FIG. 1 in that a random number generator 50 and an authentication code ID storage unit 52 are provided in the tester 14A. For this reason, the authentication code ID is not registered in the registration area 22 of the antitheft device S when the authentication code is registered with the vehicle device, but the authentication code ID is registered in the registration area 22 of the antitheft device S. Will be explained at the same time.

  First, the tester 14 is connected through the connector 15 of the vehicle communication line 12. Next, in step S31, the tester 14 starts communication with in-vehicle devices such as the anti-theft device S and vehicle devices A to E via the communication line 12.

  Next, in step S32, the tester 14 confirms the vehicle devices A to E connected to the communication line 12, and calculates the total number, in this case “5”.

  Next, in step S33, the tester 14 generates an arbitrary numerical value from 0 to 4 corresponding to the total number “5” by the random number generator 50, and selects the vehicle devices A to E corresponding to the generated numerical value. . Here, it is assumed that the vehicle device B is selected at random. At this time, the identification code of the vehicle device B (here, Ba for convenience of understanding) is recorded on the other side of the registration area 21 of the communication device of the anti-theft device S.

  Next, in step S34, the tester 14 registers the same unique authentication code ID stored in its own storage unit 52 in the registration area 32 of the selected vehicle device B and the registration area 22 of the anti-theft device S. . If the anti-theft device S has already registered the authentication code ID, the same authentication code ID as that authentication code ID is registered from the anti-theft device S. The tester 14 authenticates the anti-theft device S and the vehicle device B using the random number generator 23 and the authentication function f (Rd, ID) using the authentication code ID described in step S4. Make communication.

  Next, in step S35, the tester 14 uses a specific dummy code (here, a no-response code) in the registration areas 31, 33-35 of the vehicle devices A, C to E other than the selected vehicle device B. Register the DC. This specific dummy code DC is also stored in the anti-theft device S. Any code other than the specific dummy code DC may be registered, or nothing may be registered. The process of step S35 can be omitted. In this way, the process for registering the authentication code is completed, and the tester 14 is removed from the connector 15.

  Also in this case, after the registration process is completed, the anti-theft system 10A shown in FIG. 3 is entered.

  The anti-theft system 10B according to another embodiment of the present invention performs authentication through verification of the authentication code ID, and controls the start of the drive source 17 through the anti-theft device S, the anti-theft device S and the communication line 12. And a plurality of vehicle devices A to E that are connected to each other and can register an authentication code ID. In this case, the anti-theft device S registers the authentication code ID in at least one vehicle device B randomly selected by the tester 14 that is an external registration device among the plurality of vehicle devices A to E when the authentication code ID is registered. When the authentication code ID is authenticated, authentication is performed with the selected vehicle device B, and the start of the drive source 17 is permitted when the authentication is obtained.

  According to another embodiment of the present invention, in addition to achieving the effects of the above-described embodiment, the anti-theft device S can register at least one of the plurality of vehicle devices A to E when registering the authentication code ID. Since the function of randomly selecting the vehicle devices A to E is not required, the configuration of the anti-theft device S is further simplified.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the description in the specification and the drawings.

1 is a block diagram of a vehicle antitheft system (before authentication code registration) according to an embodiment of the present invention. FIG. It is a flowchart provided for operation | movement description at the time of registration of an authentication code (at the time of incorporating in a vehicle). 1 is a block diagram of a vehicle antitheft system (after registration of an authentication code) according to an embodiment of the present invention. It is a flowchart with which operation | movement description at the time of authentication of an authentication code (at the time of anti-theft system cancellation | release) is provided. It is a flowchart with which operation | movement description at the time of setting of an antitheft system is provided. It is a flowchart provided for operation | movement description at the time of registration of the authentication code which concerns on other embodiment of this invention (at the time of incorporating in a vehicle). It is a block diagram of the antitheft system (after authentication code registration) of vehicles concerning other embodiments of this invention.

Explanation of symbols

10, 10A, 10B ... Anti-theft system 12 ... Communication line 14, 14A ... Tester 15 ... Connector 16 ... Drive source ECU 17 ... Drive source 18 ... Alarm device 21, 22, 31-35 ... Registration area 23, 50 ... Random number generation 24, 41-45, 152 ... Storage units A-E ... Vehicle device K ... Electronic key S ... Anti-theft device

Claims (3)

A first control device that performs authentication by verifying an authentication code and controls start of the drive source;
A plurality of second control devices connected to the first control device via in-vehicle communication, each capable of registering the authentication code;
A vehicle antitheft system comprising:
The first control device includes:
At the time of registration of the authentication code, at least one second control device is randomly selected from the plurality of second control devices, and the authentication code is registered with respect to the selected second control device,
The vehicle anti-theft system, wherein authentication with the selected second control device is performed when the authentication code is authenticated, and start of the drive source is permitted when authentication is achieved. A first control device that performs authentication by verifying an authentication code and controls start of the drive source;
A plurality of second control devices connected to the first control device via in-vehicle communication, each capable of registering the authentication code;
A vehicle antitheft system comprising:
The first control device includes:
Storing that the authentication code has been registered in at least one second control device randomly selected by an external registration device among the plurality of second control devices at the time of registration of the authentication code;
The vehicle antitheft system, wherein authentication with the selected second control device is performed at the time of authentication of the authentication code, and start of the drive source is permitted when authentication is obtained. The vehicle antitheft system according to claim 1 or 2,
The first control device includes:
At the time of authentication of the authentication code, if a response related to authentication is received from the second control device other than the second control device in which the authentication code is registered, the drive source is not allowed to start. An anti-theft system for vehicles.

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