JP4407361B2 - Vehicle antitheft device - Google Patents

Description

  The present invention relates to a vehicle antitheft device, and more particularly to a vehicle for preventing vehicle theft by permitting the use of a predetermined vehicle-mounted device such as an engine start when the authentication codes of the portable device and the vehicle coincide. The present invention relates to an antitheft device.

Conventionally, in order to prevent vehicle theft, the portable device-side authentication code of the portable device carried by the vehicle user is compared with the vehicle-side authentication code registered in advance on the vehicle side, and both codes are obtained according to the comparison result. There is known a vehicle anti-theft system that cancels the anti-theft function and permits the start of the engine or the like when they match (for example, see Patent Document 1). In this system, it is possible to invalidate a specific code registered in advance by an operation of an authorized vehicle user or the like. Therefore, for example, a legitimate vehicle user notices that a legitimate portable device that transmits a portable device side authentication code corresponding to the own vehicle has been stolen, and the vehicle side authentication code corresponding to the portable device side authentication code If invalidation is requested, it is possible to prohibit the release of the anti-theft function by the portable device thereafter. For this reason, according to said system, vehicle theft using the regular portable machine can be prevented under predetermined conditions.
Japanese Patent Laid-Open No. 11-245768

  However, in the above-described system, if the authorized vehicle user is not aware of the theft of the authorized portable device, the vehicle-side authentication code is not invalidated, so that the vehicle theft cannot be effectively prevented. By the way, the portable device has a built-in transponder (communication chip) that stores the portable device side authentication code. If this communication chip is removed from the legitimate portable device by a third party in some way and attached to the vehicle at a position where it can be compared with the vehicle-side authentication code, the legitimate vehicle user will then remove the communication chip. The anti-theft function can be released using a portable device to start the engine, etc., and the above third parties can also prevent theft using an illegally duplicated key of a portable device. It is possible to cancel the function and realize engine start-up. In this case, it becomes possible for a third party to illegally use the vehicle without an authorized vehicle user or the like noticing that the communication chip has been removed from the portable device.

  The present invention has been made in view of the above points, and is a vehicle antitheft device capable of preventing vehicle theft caused by unauthorized attachment of a communication chip storing a portable device side authentication code to a vehicle. The purpose is to provide.

The above-mentioned purpose is as a result of code verification by communication between a portable device carried by a vehicle user and a vehicle side necessary for performing vehicle operation including use of a predetermined on-vehicle device within a predetermined area in the vehicle interior. A vehicle antitheft device comprising vehicle-mounted device use permission means for permitting use of a predetermined vehicle-mounted device when the portable device-side authentication code stored in the portable device matches a vehicle-side authentication code registered in advance on the vehicle side In addition, after the vehicle user gets off the vehicle, all vehicle doors are closed and the vehicle is locked by the portable device. The unauthorized use determination means for performing the code verification when an unused state is detected, and determining whether the predetermined vehicle-mounted device can be illegally used based on a result of the code verification; Unauthorized use determination If the unauthorized use of the predetermined vehicle device is determined to be performed by the step is achieved by a vehicle theft prevention device comprising a misuse suppression means for performing the suppressing operation of said non positive use, the.

  In the present invention, when a non-use state of the vehicle is detected, it is determined whether or not unauthorized use of the predetermined vehicle-mounted device can be performed based on the result of code verification between the portable device side and the vehicle side. . When the vehicle is not in use, a portable device containing a communication chip storing a portable device side authentication code is normally taken out by the vehicle user, and thereafter, the code verification between the portable device side and the vehicle side is performed. Thus, even if the code collation is performed, the collation result results in a code mismatch. On the other hand, in a situation where the communication chip built in the portable device is removed from the portable device and attached to a position where the vehicle-side authentication code can be compared with the vehicle, the portable device can be used even if the vehicle is not in use. Since it is possible to perform code verification of the authentication code between the communication chip in which the side authentication code is stored and the vehicle side, when the code verification is performed, the verification result is code matching. Therefore, if the code verification result after the vehicle is not in use is used, a communication chip that should be built in the portable device is inherently attached to the vehicle illegally. It can be determined whether unauthorized use can be performed. In the present invention, when it is determined that unauthorized use of a predetermined vehicle-mounted device can be performed, an operation for suppressing the unauthorized use is performed. When such processing is performed, unauthorized use of the predetermined vehicle-mounted device is suppressed and vehicle theft is prevented.

In this case, the antitheft apparatus for a vehicle described above, the portable device-side authentication code may be stored in the communication chip incorporated in the portable device.

In the above-described vehicle antitheft device, if the unauthorized use suppression means includes an alarm means for issuing an alarm toward the outside of the vehicle as an operation for suppressing the unauthorized use, unauthorized use of a predetermined vehicle-mounted device is performed. It is possible to notify an authorized vehicle user or the like by an alarm to the effect that it can be broken.

In addition, in the above-described vehicle antitheft device, the unauthorized use suppressing means includes a reporting means for reporting to a predetermined reporting destination as an operation for suppressing the unauthorized use. It is possible to notify an authorized vehicle user or the like by reporting to a predetermined reporting destination.

Further, in the above vehicle antitheft device, the unauthorized use suppression means invalidates the vehicle side authentication code currently matching the portable device side authentication code by the code verification as an operation to suppress the unauthorized use. Code invalidation means can be used to eliminate unauthorized use of a predetermined vehicle-mounted device using a communication chip that should be illegally attached to a vehicle and should be built in a portable device by code invalidation. .

In the above-described vehicle antitheft device, the onboard device use permission means may be engine start permission means for permitting start of an engine mounted on the vehicle.

ADVANTAGE OF THE INVENTION According to this invention, the unauthorized use of a predetermined vehicle equipment can be suppressed and prevention of vehicle theft can be aimed at.

In addition, according to the third aspect of the present invention, by informing the like authorized vehicle user by the warning to the effect that unauthorized use of the predetermined vehicle device can take place, the vehicle theft by suppressing unauthorized predetermined vehicle device Prevention can be achieved.

According to the invention described in claim 4, the unauthorized use of the predetermined vehicle-mounted device can be suppressed by notifying an authorized vehicle user or the like by a notification to a predetermined report destination that the vehicle can be illegally used. Therefore, it is possible to prevent vehicle theft.

According to the invention described in claim 5 , the vehicle is stolen by eliminating the illegal use of the predetermined vehicle-mounted device using the communication chip that is illegally attached to the vehicle and normally to be incorporated in the portable device by disabling the code. Prevention can be achieved.

According to the sixth aspect of the invention, it is possible to prevent theft of the vehicle by suppressing the unauthorized start of the engine.

  FIG. 1 is a configuration diagram of a vehicle antitheft system that prevents theft of a vehicle according to an embodiment of the present invention. As shown in FIG. 1, the vehicle antitheft system of this embodiment includes a vehicle antitheft device 10 mounted on a vehicle, and a portable terminal 12 carried by a regular vehicle user such as a vehicle owner or driver. And a center 14 as an infrastructure outside the vehicle.

  The vehicle antitheft device 10 includes an alarm control electronic control unit (hereinafter referred to as an alarm control ECU) 16. The alarm control ECU 16 closes all vehicle doors in a state where vehicle keys necessary for performing vehicle operations such as engine start and door locking / unlocking carried by the vehicle user are not inserted into the ignition key cylinder of the vehicle. It is determined whether or not it is locked. As a result of the determination, if it is determined that all vehicle doors are closed and locked when the vehicle key is not inserted, vehicle theft such as the vehicle itself, vehicle components such as a tire and an engine, and items placed in the vehicle. The mode for canceling the warning (hereinafter referred to as the no warning mode) is shifted to a mode for warning the vehicle theft (hereinafter referred to as the warning mode). Thereafter, when any vehicle door is properly unlocked or the engine is normally started in the alert mode, the mode is shifted from the alert mode to the no alert mode.

  The alarm control ECU 16 is connected with an in-vehicle alarm device 18 and a communication device 20. The vehicle-mounted alarm device 18 turns on various lamps such as a siren, a horn, a buzzer, a hazard lamp, etc., and sounds in order to notify the vehicle surroundings of an abnormal state through vision and hearing in accordance with an operation signal supplied from the alarm control ECU 16. A warning by guidance is issued to the outside of the vehicle. Note that the on-vehicle alarm device 18 connected to the alarm control ECU 16 may be a part of these sirens, horns, etc., or may be used alone or in any combination. Further, the communication device 20 can be wirelessly connected to the center 14 via the communication network using radio waves having a predetermined frequency. The communication device 20 is communicably connected to the center 14 in accordance with the operation signal supplied from the alarm control ECU 16, and wirelessly reports the abnormal state together with the ID information of the own vehicle or the vehicle user to the center 14.

  The alarm control ECU 16 has a function of detecting a vehicle theft action using various sensors and switches such as an inclination sensor and an intrusion sensor in the alert mode. When the alarm control ECU 16 detects a vehicle theft in the warning mode, the alarm control ECU 16 supplies an operation signal to the in-vehicle alarm device 18 to notify the vehicle theft, and also indicates that the vehicle theft has been performed. An operation signal is supplied to the communication device 20 so as to notify the center 14 with the ID information of the person. In this case, the in-vehicle alarm device 18 performs processing for notifying the outside of the vehicle through visual or auditory sense that the vehicle theft is being performed, and the communication device 20 includes the ID information and the vehicle theft. A process of notifying the center 14 that an action is being performed is executed. When the center 14 receives a report on the vehicle theft from the vehicle antitheft device 10 mounted on the vehicle, the center 14 is authorized to correspond to the vehicle registered in advance based on the ID information included in the report information. The vehicle user is specified, and the mobile terminal 12 carried by the authorized vehicle user is notified that the vehicle theft has been carried out by telephone call or email. When the mobile terminal 12 receives a report regarding the vehicle theft from the center 14, the mobile terminal 12 displays that fact on the display or outputs the sound from the speaker.

  Therefore, according to the system of the present embodiment, when a vehicle theft is performed in the alert mode, the vehicle-mounted alarm device 18 issues an alarm regarding the vehicle theft, so that people around the vehicle encounter the vehicle theft. In addition, the vehicle vehicle antitheft device 10 can notify the mobile terminal 12 of the authorized vehicle user of the vehicle theft via the center 14, so that the authorized vehicle user Can know that their vehicle has been stolen. In this case, a legitimate vehicle user can know information on the vehicle theft even when he / she is away from his / her vehicle, so that the countermeasures can be easily taken and the vehicle theft prevention function can be improved. It becomes.

  The vehicle antitheft device 10 includes an immobilizer electronic control unit (referred to as an immobilizer control ECU) 22 connected to the alarm control ECU 16 described above. An engine ECU 24 that controls the engine of the vehicle is connected to the immobilizer control ECU 22. The immobilizer control ECU 22 has a memory 26 for storing an authentication code corresponding to its own vehicle in advance. Hereinafter, the authentication code registered on the vehicle side is referred to as a registration authentication code. In addition, a plurality of vehicle keys 30 necessary for vehicle operations such as engine starting and door locking / unlocking carried by the vehicle user are usually provided for one vehicle, and each has its own authentication code. A transponder (communication chip) 32 for storing (hereinafter referred to as a key-side authentication code) is incorporated. The above-described memory 26 on the vehicle side stores a plurality of registration authentication codes that match all the key-side authentication codes so as to correspond to the vehicle keys 30, respectively.

  When the immobilizer control ECU 22 determines that the vehicle key 30 is inserted into the ignition key cylinder of the vehicle, the immobilization control ECU 22 is within a predetermined area around the key cylinder so as to perform code verification processing between the vehicle key 30 and the vehicle side only for a predetermined period. Generate a magnetic field. This predetermined area is limited to an extremely narrow range including at least the vehicle key 30 inserted into the ignition key cylinder. The vehicle key 30 transmits its own key-side authentication code from the communication chip 32 when detecting a magnetic field generated around the key cylinder. When the immobilization control ECU 22 receives a key-side authentication code transmitted from the vehicle key 30 inserted into the key cylinder in a state where a magnetic field is generated around the key cylinder, the immobilization control ECU 22 stores the received key-side authentication code and the memory 26 in advance. The code is verified against the registered authentication code registered in.

  The immobilizer control ECU 22 permits engine start from a mode in which engine start is prohibited (hereinafter referred to as an immobilizer system set mode) when the mutual authentication codes match as a result of code verification between the vehicle key 30 and the vehicle side. A mode (hereinafter referred to as an immobilization system unset mode) is entered, and a signal for allowing the engine to start is supplied to the engine ECU 24. The engine ECU 24 permits the start of the vehicle engine when receiving an engine start permission signal from the immobilizer control ECU 22, and then starts the vehicle engine when an engine starter switch or the like is operated. On the other hand, the immobilizer control ECU 22 continues the set mode of the immobilizer system and continues the prohibition of engine start when the mutual authentication codes do not match as a result of the code collation described above.

  When the immobilizer control ECU 22 determines that the vehicle key 30 is removed from the ignition key cylinder into which the vehicle key 30 is inserted, the immobilizer system shifts from the unset mode to the set mode. When such a set mode is realized, the engine start is prohibited thereafter until the authentication codes match by code verification.

  Therefore, according to the system of the present embodiment, when the regular vehicle key 30 with the authentication code registered on the vehicle side is inserted into the key cylinder of the vehicle with the communication chip 32 built in, the engine is allowed to start. On the other hand, when a duplicate key whose key groove matches the regular vehicle key 30 is inserted into the key cylinder, the engine is started unless the duplicate key contains the communication chip 32 storing the regular key-side authentication code. Is prohibited, so that it is possible to prevent the vehicle from being stolen by the duplicate key.

  By the way, with the above system alone, a third party who is trying to steal the vehicle removes the communication chip 32 storing the key-side authentication code from the legitimate vehicle key 30 by some method, and removes the communication chip 32 from the vehicle key. The vehicle corresponding to the vehicle 30 is mounted in the vicinity of the ignition key cylinder, and a duplicate key obtained by mechanically duplicating the regular vehicle key 30 is inserted into the ignition key cylinder, so that the vehicle can be used without being known to a regular vehicle user. It becomes possible to start the engine.

  That is, when a duplicate key, in which a regular vehicle key 30 is mechanically duplicated by a third party in the set mode of the immobilizer system, is inserted into the ignition key cylinder, a magnetic field is generated around the key cylinder. The communication chip 32 storing the attached normal key-side authentication code responds to the magnetic field and transmits the key-side authentication code, and the vehicle side receives the key-side authentication code. In this case, since the code verification between the vehicle key 30 and the vehicle side results in a match between the authentication codes, the immobilizer control ECU 22 shifts from the immobilizer set mode for prohibiting engine start to the unset mode, Engine start is permitted. A similar result is also caused when a legitimate vehicle user inserts the vehicle key 30 from which the communication chip 32 has been removed into the ignition key cylinder. Therefore, in this way, a third party can start the vehicle engine and ride around the vehicle without being known by a legitimate vehicle user.

  Therefore, the system of the present embodiment is characterized in that the engine is prevented from being illegally started due to unauthorized attachment of the communication chip 32 storing such a key-side authentication code to the vehicle, thereby preventing vehicle theft. is doing. Hereinafter, with reference to FIG.2 and FIG.3, the characteristic part of a present Example is demonstrated. FIG. 2 shows an example of a time chart realized in the vehicle antitheft device 10 of this embodiment.

  In the vehicle antitheft device 10 according to the present embodiment, the vehicle key 30 is inserted into the ignition key cylinder at time t1, whereby the vehicle key 30 and the vehicle side are subjected to code verification processing. When the match is completed, the immobilizer system switches from the set mode for prohibiting engine start to the unset mode for permitting engine start (time t2). After that, when the vehicle key 30 is removed from the ignition key cylinder at time t3, the immobilizer system is switched from the unset mode to the set mode at that time.

  When all vehicle doors are closed and locked in a state where the vehicle key 30 is removed from the ignition key cylinder, that is, in a state where the vehicle key 30 is not inserted into the ignition key cylinder, the warning of vehicle theft is released. Switching from the no-warning mode to a warning mode that warns of vehicle theft is performed (time t4).

  In the present embodiment, the alarm control ECU 16 causes the immobility control ECU 22 to perform code collation processing between the vehicle key 30 and the vehicle side when the transition from the no-warning mode to the warning mode is made (time t4). The command is supplied. When the immobilization control ECU 22 receives the command from the alarm control ECU 16, the immobilization control ECU 22 surrounds the ignition key cylinder so as to perform the code collation process for a predetermined period as in the case where the vehicle key 30 is inserted into the ignition key cylinder as described above. A magnetic field is generated in a predetermined region (indicated by a one-dot chain line in FIG. 2C).

  In the normal state in which the communication chip 32 storing the key-side authentication code that should be inherently incorporated in the vehicle key 30 is not improperly attached in the vicinity of the ignition key cylinder of the vehicle, as described above, around the ignition key cylinder in the alert mode. Even if a code verification process is performed by generating a magnetic field, the vehicle key 30 (specifically, the communication chip 32) and the vehicle side (specifically, the ignition key cylinder side) are largely separated. The code verification result at time t5 is not completed due to the coincidence of the authentication codes, and the immobilizer system is maintained in the set mode as indicated by the solid line in FIG.

  On the other hand, when the communication chip 32 is improperly attached in the vicinity of the ignition key cylinder, if a magnetic field is generated around the ignition key cylinder in the alert mode as described above and the code verification process is performed, Since the attached communication chip 32 and the ignition key cylinder side are close to each other, the code verification result at time t5 is completed when the authentication code matches, and the immobilizer system is indicated by a one-dot chain line in FIG. Switch from set mode to unset mode.

  The immobilizer control ECU 22 performs the code verification process in the alert mode as described above, and then supplies the code verification result, that is, a signal indicating the mode state of the immobilizer system to the alarm control ECU 16. After the alarm control ECU 16 shifts to the warning mode, if it is determined that the code verification result matches the authentication code and the immobilizer system is in the unset mode based on the signal supplied from the immobility control ECU 22, the alarm control ECU 16 An operation signal is supplied to the in-vehicle alarm device 18 to notify that there is a possibility that the engine may be improperly started due to the unset mode, and ID information of the own vehicle or vehicle user is added to that effect. Then, an operation signal is supplied to the communication device 20 so as to notify the center 14, and at least the registration authentication code that matches the key-side authentication code is invalidated by the code verification processing in the above-described warning mode, and A command signal is sent to the immobilizer control ECU to forcibly switch the unset mode of the immobilizer system to the set mode. Supplied to the 2.

  In this case, the in-vehicle alarm device 18 performs processing for notifying the outside of the vehicle through visual or auditory sense that the engine can be illegally started, and the communication device 20 includes the ID information to detect the illegal engine. A process of notifying the center 14 that the start can be performed is executed. When the center 14 receives a report on the unauthorized engine start from the vehicle antitheft device 10 mounted on the vehicle, the center 14 is authorized to correspond to the vehicle registered in advance based on the ID information included in the report information. The vehicle user is specified, and the mobile terminal 12 carried by the legitimate vehicle user is notified that the engine can be illegally started through a call or email. When the portable terminal 12 receives a report about the engine unauthorized start from the center 14, the portable terminal 12 displays that fact on the display or outputs the sound from the speaker. Further, the immobilizer control ECU 22 invalidates the registration authentication code that matches the key-side authentication code by the code verification process in the above-described warning mode, and thereafter prohibits the code verification process using the authentication code and the immobilizer system. Force switch to set mode.

  FIG. 3 shows a flowchart of an example of a control routine executed by the alarm control ECU 16 in the vehicle antitheft device 10 of this embodiment in order to realize the above function. The routine shown in FIG. 3 is a routine that is repeatedly activated every predetermined time. When the routine shown in FIG. 3 is started, first, the process of step 100 is executed.

  In step 100, the vehicle key 30 is removed from the ignition key cylinder, that is, the vehicle key 30 is not inserted into the ignition key cylinder. It is determined whether or not the mode has been switched to the alert mode. As a result, if it is determined that such switching has not been performed, the current routine is terminated without any further processing. On the other hand, if it is determined that such switching has been performed, the process of step 102 is executed next.

  In step 102, a process of supplying a command for causing the immobilizer control ECU 22 to execute a code matching process between the vehicle key 30 and the vehicle side is executed. When the command is supplied by executing the process of step 102, the immobilizer control ECU 22 subsequently performs the code verification process by generating a magnetic field in a predetermined area around the ignition key cylinder for a predetermined period. . If the immobilization control ECU 22 determines that the verification code does not match as a result of the code verification, the immobilization control ECU 22 maintains the immobilization set mode, and then the code verification is completed due to the verification code mismatch and the immobilization system is set. A signal indicating the mode is supplied to the alarm control ECU 16. On the other hand, if it is determined that the authentication codes match as a result of the code verification described above, the immobilizer set mode is shifted to the unset mode. A signal indicating the presence is supplied to the alarm control ECU 16.

  In step 104, after a predetermined time has elapsed since the process of supplying the command signal to the immobilizer control ECU 22 by executing the warning mode in step 102, the state of the immobilizer system supplied from the immobilizer control ECU 22 is set mode. It is determined whether or not. The predetermined time is set in consideration of at least the time from the start of code verification in the immobilizer control ECU 22 to the completion thereof and the communication time between the alarm control ECU 16 and the immobilizer control ECU 22. As a result, in the case of the set mode, it can be determined that the communication chip 32 to be built in the vehicle key 30 is not improperly attached to the vehicle. If such a determination is made, the current routine is terminated. . On the other hand, in the unset mode, since it can be determined that the communication chip 32 to be built in the vehicle key 30 has been improperly attached to the vehicle, if such determination is made, the processing of step 106 is performed next. Executed.

  In step 106, an operation signal is supplied to the in-vehicle alarm device 18, an operation signal is supplied to the communication device 20, and the authentication code is invalidated and the immobilizer system is forced to the immobilizer control ECU 22. Processing for supplying a command signal for requesting switching to the set mode is executed. After the processing of this step 106 is executed, the in-vehicle warning device 18 thereafter uses a siren, a horn, and a buzzer to inform the vehicle surroundings that the engine can be improperly started because of the immobilizer set mode in the warning mode. Various lamps such as blowing sounds, hazard lamps, etc., and warnings by voice guidance are issued to the outside of the vehicle, and the communication device 20 warns the communication-connected center 14 together with ID information of the own vehicle or the vehicle user. Because the immobilizer set mode in the mode, the wireless notification is made that the engine can be illegally started, and the immobilizer control ECU 22 invalidates the registration authentication code that matches the key-side authentication code by the code verification processing in the warning mode At the same time, the immobilizer system is forcibly switched from the unset mode to the set mode. In this case, the center 14 notifies the mobile terminal 12 carried by the authorized vehicle user of the fact according to the notification from the communication device 20. When the processing of step 106 is completed, the current routine is terminated.

  According to the routine shown in FIG. 3, when the vehicle key 30 is inserted into the ignition key cylinder, the transition from the no-warning mode to the warning mode for vehicle theft is performed, that is, the warning mode is detected. At this time, it is possible to force the immobilizer control ECU 22 to perform code verification between the vehicle key 30 and the vehicle side. Immobilization control ECU22 supplies the alarm ECU16 the signal which shows the code verification result, ie, the mode state of an immobilizer system, when performing the forced code verification based on the instruction | indication from this alarm control ECU16.

  When the vehicle is in the alert mode, there is usually no vehicle key 30 carried by a legitimate vehicle user, particularly around the ignition key cylinder in the passenger compartment. However, the code verification result will not be completed due to the match of the authentication code, and the immobilizer system should be maintained in the set mode. Therefore, when the code verification result in the warning mode is completed by the coincidence of the authentication code and the immobilizer system is switched from the set mode to the unset mode, the vehicle key carried by the authorized vehicle user around the ignition key cylinder It can be determined that the communication chip 32 to be built in 30 is improperly attached.

  In the routine shown in FIG. 3, when the immobilizer system is switched from the set mode to the unset mode by performing the above-described forced code collation, the communication chip 32 to be incorporated in the vehicle key 30 is changed to the vehicle ignition. It is determined that the engine is mounted in the vicinity of the key cylinder, and the immobilizer set mode is realized in the warning mode, so that the engine can be started illegally by driving the on-vehicle alarm device 18 and By driving the communication device 20, it is possible to notify an authorized vehicle user via the center 14 and the portable terminal 12.

  For this reason, a third party temporarily removes the communication chip 32 storing the key-side authentication code from the regular vehicle key 30 and attaches the communication chip 32 to a position near the ignition key cylinder in the vehicle corresponding to the vehicle key 30. In this case, when the vehicle shifts from the no-warning mode to the warning mode, the surroundings of the vehicle and the authorized vehicle user can know that the engine can be illegally started due to the unauthorized mounting.

  Further, in the routine shown in FIG. 3, when the immobilizer system is switched to the unset mode by performing the above-mentioned forced code collation, the communication chip 32 to be incorporated in the vehicle key 30 is the vehicle ignition key. Judgment that it is installed in the vicinity of the cylinder, and further invalidates the registration authentication code that matches the key-side authentication code by code verification processing in the warning mode, and also switches from the unset mode of the immobilizer system to the set mode. Can be realized.

  For this reason, even if the communication chip 32 storing the key-side authentication code removed from the regular vehicle key 30 is attached in the vicinity of the ignition key cylinder in the vehicle corresponding to the vehicle key 30, Then, after it is detected that the engine can be illegally started, it is avoided that the code verification using the key side authentication code of the communication chip 32 is completed by the authentication code match. Allowed is excluded. Even in this case, the engine start using the other vehicle key 30 from which the communication chip 32 has not been removed can be performed as usual, so that the other vehicle key 30 can be held by an authorized vehicle user. For example, an authorized vehicle user can start the engine using the other vehicle key 30 and use the vehicle.

  Therefore, according to the vehicle antitheft device 10 of the present embodiment, the engine chip caused by illegally attaching the communication chip 32 storing the key-side authentication code that should be built in the vehicle key 30 to the vehicle. Unauthorized starting can be suppressed, so that even if a thief enters the vehicle compartment illegally, it is possible to prevent unauthorized driving and theft of the vehicle itself. This prevention of vehicle theft is realized in a state in which engine start using the spare vehicle key 30 by an authorized vehicle user is ensured.

  By the way, in the above embodiment, the vehicle key 30 is claimed in the “portable device” described in the claims, the vehicle engine is claimed in the “predetermined in-vehicle device” described in the claims, and the key side authentication code is claimed. The registration authentication code is described in the “vehicle-side authentication code” described in the claims, and the center 14 and the mobile terminal 12 are described in the “predetermined” It corresponds to “report destination”.

  Further, in the above-described embodiment, the immobility control ECU 22 of the vehicle antitheft device 10 causes the engine ECU 24 to execute an engine operation when the key authentication code on the vehicle key 30 side matches the registration authentication code on the vehicle side. By supplying a signal permitting the start of the engine, the “on-vehicle device use permitting means” and the “engine start permitting means” described in the claims are performed by the alarm control ECU 16 in accordance with the process of step 102 in the routine shown in FIG. By executing the code verification, the “code verification determination means” described in the claims is realized.

  Further, when the alarm control ECU 16 detects the warning mode against the vehicle theft, the “non-use state detecting means” described in the claims executes the process of step 104 in the routine shown in FIG. The “unauthorized use determination unit” described in the claims executes the processing of step 106, so that the “unauthorized use suppression unit” described in the claims activates the in-vehicle alarm device 18 in step 106. The "warning means" described in the claims activates the communication device 20 in step 106, and the "report means" described in the claims invalidates the authentication code to the immobilizer control ECU 22 in step 106. By doing so, the "code invalidation means" described in the claims is realized respectively. It has been.

  In the above-described embodiment, when the mode for vehicle theft is changed from the no-warning mode to the warning mode, specifically, all the vehicle doors are opened with the vehicle key 30 not inserted into the ignition key cylinder. When it is closed and locked, the vehicle key 30 and the vehicle side are collated to determine whether or not the engine can be illegally started. The present invention is not limited, and after the vehicle key 30 is removed from the ignition key cylinder, after the vehicle key 30 is in a state where it cannot detect the magnetic field generated around the key cylinder, for example, the above-described warning mode is set. Before being realized, when the vehicle user carrying the vehicle key 30 gets off and the vehicle door moves from the open state to the closed state; It may be.

  In the above embodiment, the code verification between the vehicle key 30 and the vehicle side in the immobilization control ECU 22 is performed when the vehicle key 30 is inserted into the ignition key cylinder and the command from the alarm control ECU 16 to prevent dark current. However, this code verification may be performed at all times. In such a configuration, the immobilizer control ECU 22 always supplies the code control result, that is, the mode state of the immobilizer system, to the alarm control ECU 16. In this case, the alarm control ECU 16 can determine the mode state of the immobilizer system at any time without instructing the immobilizer control ECU 22 to perform forced code verification. After the key 30 is removed, the vehicle key 30 becomes unable to detect the magnetic field generated around the key cylinder (for example, the vehicle user carrying the vehicle key 30 gets off and the vehicle door is closed from the open state). If the mode state is determined at the time of transition to the state or when the warning mode is realized), it is possible to determine whether or not the engine can be illegally started.

  Further, in this case, after the vehicle key 30 is removed from the ignition key cylinder, the alarm control ECU 16 is always in the mode state of the immobilizer system after the vehicle key 30 becomes unable to detect the magnetic field generated around the key cylinder. If the vehicle door is determined to be improperly started when the vehicle door transitions from the open state to the closed state or when the warning mode is realized, measures are taken to suppress such engine improper start. It may be taken.

  Further, in the above embodiment, when it is determined that the communication chip 32 to be incorporated in the vehicle key 30 is attached in the vicinity of the ignition key cylinder of the vehicle, and it is determined that the engine can be illegally started. In addition, as an operation for suppressing the engine improper start, (1) an alarm by the on-vehicle alarm device 18, (2) a report to the center 14 and the mobile terminal 12 by the communication device 20, and (3) an immobilizer control ECU 22 Although it is intended to realize the invalidation of a specific registration authentication code and the forced switching of the immobilizer system to a set mode, any system that takes at least one of these (1) to (3) Good.

  Further, the above-described embodiment is a system that permits engine start based on the result of code collation between the vehicle key 30 and the vehicle side, and makes unauthorized start of the vehicle engine illegal use of the in-vehicle device. The present invention is not limited to this, and can be applied to, for example, those relating to locking and unlocking of vehicle doors and steering lock.

It is a block diagram of the system which prevents theft of the vehicle which is one Example of this invention. It is a time chart implement | achieved in the antitheft device for vehicles of a present Example. It is a flowchart of the control routine performed in the vehicle antitheft device of the present embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle antitheft device 12 Portable terminal 14 Center 16 Alarm control ECU
18 On-vehicle alarm device 20 Communication device 22 Immobilizer control ECU
30 Vehicle key 32 Communication chip

Claims (6)

Stored in the portable device as a result of code verification by communication between the portable device carried by the vehicle user and the vehicle side necessary for performing vehicle operations including the use of the predetermined vehicle-mounted device within a predetermined area in the vehicle interior When the portable device side authentication code to be matched with the vehicle side authentication code registered in advance on the vehicle side, a vehicle antitheft device comprising onboard device use permission means for permitting the use of a predetermined onboard device,
A non-use state detecting means for detecting a non-use state of a vehicle in which all vehicle doors are closed and locked by the portable device after the vehicle user gets off;
When the non-use state is detected by the non-use state detection unit, the code verification is performed, and it is determined whether the predetermined vehicle-mounted device can be illegally used based on the result of the code verification Unauthorized use determination means to
When it is determined by the unauthorized use determination means that unauthorized use of the predetermined vehicle-mounted device can be performed, unauthorized use suppression means for executing an operation for suppressing the unauthorized use;
The antitheft device for vehicles characterized by comprising.   2. The vehicle antitheft device according to claim 1, wherein the portable device side authentication code is stored in a communication chip built in the portable device.   2. The vehicle antitheft device according to claim 1, wherein the unauthorized use suppressing means includes an alarm means for issuing an alarm toward the outside of the vehicle as an operation for suppressing the unauthorized use.   4. The vehicle antitheft device according to claim 1 or 3, wherein the unauthorized use suppressing means includes reporting means for reporting to a predetermined reporting destination as an operation for suppressing the unauthorized use.   The unauthorized use suppressing means includes code invalidating means for invalidating the vehicle-side authentication code that matches the portable device-side authentication code by the code verification at present as an operation for suppressing the unauthorized use. The vehicle antitheft device according to claim 1, 3 or 4.   2. The vehicle antitheft device according to claim 1, wherein the onboard equipment use permission means is engine start permission means for permitting start of an engine mounted on the vehicle.

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