JP2005206048A - Antitheft device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a vehicle from being easily thieved by a new mechanical key being registered as a regular one even if one mechanical key and a portable device are handed to other person in a set state, without changing the composition of an immobilizer system including the register method of the new mechanical key as much as possible when a smart keyless entry system is added to the immobilizer system. <P>SOLUTION: A smart keyless entry control means 5 is provided with a key identification code change means 9 changing the key identification code of the mechanical key 1 to a second key identification code. The second key identification code changed by the key identification code change means 9 is previously registered to an engine control means 10, and the engine control means 10 makes the engine be ready for starting when the second key identification code to be registered coincides with the second key identification code received from the smart keyless entry control means 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle antitheft device, and in particular, when a mechanical key inserted into an ignition key cylinder of the vehicle is a regular mechanical key of the vehicle, or an application of the vehicle door carried by the vehicle occupant. The present invention belongs to the technical field of an antitheft device for a vehicle in which the engine of the vehicle can be started when the lock portable device is an authorized portable device of the vehicle.

  Conventionally, for example, as shown in Patent Document 1 below, an immobilizer system for preventing theft of a vehicle is well known. In this system, the transmitter that transmits the key identification code to the mechanical key is built in, and when this mechanical key is inserted into the ignition key cylinder of the vehicle, the key identification code transmitted from the transmitter is the vicinity of the ignition key cylinder. The key identification code is transmitted to the engine control unit. The engine control unit compares the received key identification code with a key identification code registered in advance in the engine control unit and the like. Then, the engine is allowed to start, whereby the occupant can start the engine with the mechanical key.

  In recent years, for example, as shown in Patent Document 2 below, a smart keyless entry system has been proposed in which a passenger can lock and unlock a door and start an engine without using a mechanical key. In this system, the portable device carried by the passenger incorporates a transmitter that periodically transmits a portable device identification code wirelessly, and the portable device identification code transmitted from the transmitter is received by the receiver, and the portable device identification code is transmitted to the portable device. The machine identification code is transmitted to the smart keyless entry control unit. The smart keyless entry control unit compares the received portable device identification code with the portable device identification code registered in the smart keyless entry control unit or the like in advance, and when the portable device identification code matches the portable device identification code, The door of the vehicle is locked / unlocked according to the received electric field strength of the radio signal transmitted from the transmitter of the portable device, assuming that it is genuine. When an occupant carrying the portable device enters the passenger compartment, the engine of the vehicle is brought into a startable state, so that the occupant can start the engine keylessly by simply rotating the engine starting knob. become.

JP-A-10-86793 JP 2003-269019 A

  By the way, when adding the smart keyless entry system to the immobilizer system, it is simple and preferable not to change the configuration of the immobilizer system (particularly the engine control unit) as much as possible. In this case, when a smart keyless entry control unit is provided in the middle part connecting the receiver that receives the key identification code transmitted by the mechanical key transmitter and the engine control unit, and the key identification code is received, the key When the identification code is transmitted to the engine control unit and the portable device identification code is received, the portable device identification code is collated, and when it is determined that the portable device is genuine, a plurality of such codes are set for the vehicle. It is conceivable that the same key identification code as that of any one of the regular mechanical keys is transmitted to the engine control unit. When the engine control unit receives a key identification code transmitted from the smart keyless entry control unit when it is determined that the portable device is genuine, the received key identification code is registered in the engine control unit or the like. By matching the key identification code, the vehicle engine is always in a startable state.

  Further, in the above-described immobilizer system, normally, the same key identification code as that of the new mechanical key can be registered in the engine control unit or the like so that the new mechanical key can be used as a regular one. When performing this registration, two regular mechanical keys (main key M and sub key S) corresponding to the key identification code already registered in the engine control unit or the like are continuously used for a predetermined operation (for example, main key). After the engine is started using the key M, the engine is once stopped, and then the engine is started using the sub key S, and then the engine is stopped). That is, when the engine control unit receives two different key identification codes in succession, the engine control unit is ready for registration. In this state, a new mechanical key is inserted into the ignition key cylinder to perform a predetermined operation (for example, engine start operation). Is performed, the same key identification code as the new mechanical key is registered in the engine control unit. In this way, a new mechanical key can be easily registered while securing theft resistance.

  However, as described above, in the configuration in which the smart keyless entry system is added to the immobilizer system that can register a new mechanical key, when a vehicle is rented to another person, the new mechanical key is illegally registered to others. There is a risk of being. In other words, a legitimate owner of a vehicle and a person who drives the vehicle usually lends the vehicle to another person from the point of having one mechanical key and a portable device set for convenience. In this case, it is common to hand over a person with one mechanical key and a portable device set, and if another person uses the portable device continuously following the mechanical key, the portable device is A smart keyless entry control unit that transmits the same key identification code as any one of a plurality of regular mechanical keys set for the vehicle to the engine control unit when it is determined to be a regular one. May send different key identification codes to the engine control unit twice in succession. Similar to when continued use, the engine control unit, will be continuously received twice a different key identification code to each other, thereby, it becomes possible to illegally registering a new mechanical key.

  Therefore, in order to deal with such problems, for example, when a portable device is continuously used following a mechanical key and a portable device identification code is received, the smart keyless entry control unit checks the portable device identification code. When it is determined that the portable device is authorized, the same key identification code as the most recently used mechanical key among the authorized mechanical keys set for the vehicle is transmitted to the engine control unit. Can be considered. That is, in this case, since the same key identification code is transmitted to the engine control unit twice in succession, a new mechanical key cannot be illegally registered.

  However, even if such anti-theft measures are taken, after authenticating the smart keyless entry control unit using a regular portable device following the mechanical key, the smart keyless entry control unit is removed and the key identification code receiver When the engine control unit is directly connected to the engine control unit and a new mechanical key is inserted into the ignition key cylinder, the key identification code of the new mechanical key is registered in the engine control unit. That is, if the key identification code receiver and the engine control unit are illegally connected in this manner, the system is close to the system described in Patent Document 1, and the anti-theft property may not be ensured. is there.

  As described above, in the present invention, when a smart keyless entry system is added to an immobilizer system, the configuration of the immobilizer system is changed as much as possible including a new mechanical key registration method, and one mechanical key is assigned to another person. It is an object to prevent a vehicle from being easily stolen by registering a new mechanical key as a legitimate item even if the portable device is passed in a set state.

  The first configuration of the vehicle antitheft device according to the present invention is that the engine of the vehicle can be started when the mechanical key inserted into the ignition key cylinder of the vehicle is a regular mechanical key of the vehicle. An anti-theft device for a vehicle that enables the engine of the vehicle to be started even when the portable device for locking and unlocking the door of the vehicle carried by a vehicle occupant is an authorized portable device of the vehicle. The key identification code transmitting means provided in the mechanical key for transmitting the key identification code, the portable identification code transmitting means provided in the portable device for transmitting the portable machine identification code, and the key identification code transmitting means. When the portable device identification code transmitted by the portable device identification code transmitting means is received, The key key code transmitted from the key identification code transmitting means is the second key identification, the smart keyless entry control means capable of locking and unlocking the engine, the engine control means for permitting or not permitting the start of the vehicle engine, and the key identification code transmitting means. A key identification code converting means for converting into a code. The same key identification code as the mechanical key can be registered in the smart keyless entry control means, and the engine control means is converted by the key identification code converting means. The second key identification code is registered in advance, and when the engine control means receives the second key identification code via the key identification code conversion means, the engine control means registers in advance with the received second key identification code. The second key identification code is collated, and when they match, the vehicle engine is brought into a startable state. Are those configured urchin.

  According to the first configuration, the vehicle antitheft device according to the present invention includes a mechanical key provided with a key identification code transmitting unit for transmitting a key identification code, and a key identification code transmitting unit, which are conventionally used. A portable device for transmitting a portable device identification code to an immobilizer system comprising engine control means for enabling the engine to be started when the key identification code received from the key matches the key identification code stored in advance A portable device provided with a machine identification code transmission means, a key identification code transmitted by the key identification code transmission means, and a smart keyless entry control means for receiving the portable machine identification code transmitted by the portable machine identification code transmission means; To create an immobilizer system with a so-called smart keyless entry system. It is obtained by adding a key identification code converting means for converting the key identification code transmitted from the identification code transmitting means to the second key identifier. Therefore, the same immobilizer system with a smart keyless entry system can be used. That is, the main configuration change can be minimized. Under such a configuration, the smart keyless entry system usually determines whether the portable device is genuine, and the immobilizer system (engine control means) can store the key identification code of the mechanical key. Has been. For this reason, after handing the mechanical key and portable device to another person in a set state, the smart keyless entry system is obtained after the other person uses the portable device to determine that the smart keyless entry system is a legitimate portable device. , Remove the key identification code, and connect the key identification code receiving means directly. After that, insert a new mechanical key into the ignition key cylinder and register the new mechanical key in the immobilizer system (engine control means). Even if the vehicle and the set of the mechanical key and portable device are returned to the owner of the legitimate vehicle by connecting to the above state, the above-mentioned other person can steal the vehicle using a new mechanical key. End up. However, according to the configuration of the present invention, the second key identification code is not transmitted to the engine control means and is not registered without passing through the keyless entry control means and the key identification code conversion means. The second key identification code for starting the engine is not registered even with another person's trick. Therefore, there is almost no possibility of registering a new mechanical key, and the anti-theft property can be improved.

  According to a second configuration of the present invention, when the smart keyless entry control means determines that the mechanical key and the portable device are consecutive ones of the vehicle, the smart keyless entry control means The second key identification code that is the same as the most recently transmitted second key identification code is transmitted to the engine control means, and the engine control means continuously receives different second key identification codes from each other. Only after the reception, a new second key identification code can be registered.

  According to the second configuration, the smart keyless entry control means determines that the mechanical key is a mechanical key for the vehicle, and the key identification code of the mechanical key is converted to the second key identification code by the key identification code conversion means. And after the converted second key identification code is transmitted to the engine control means, the smart keyless entry control means determines that the portable device is a portable machine for the vehicle, or the smart keyless entry control means. It is determined that the portable device is a portable device for the vehicle, and one of the key identification codes registered in the smart keyless entry control means is converted into a second key identification code by the key identification code conversion means, After the converted second key identification code is transmitted to the engine control means When the smart key is determined to be a mechanical key for the vehicle by the smart keyless entry control means, the smart keyless entry control means uses the second key that is the same as the second key identification code transmitted most recently to the engine control means. This means that the identification code is transmitted to the engine control means. That is, even if it is determined that the portable device is also a genuine one for the vehicle following the mechanical key, or the mechanical key is also determined for the vehicle following the portable device, the engine control means Only the same second key identification code is transmitted continuously. The engine control means can register a new second key identification code only after continuously receiving different second key identification codes. Therefore, it is not permitted to insert a new mechanical key into the key cylinder and register it as a new second key identification code after this. After using the mechanical key in advance, set the mechanical key and portable device to others. Since a new mechanical key is not registered even if handed over in the state, the effect of improving theft resistance can be further exhibited.

  In a third configuration relating to the present invention, the key identification code conversion means is provided in the smart keyless entry control means.

  According to the third configuration, since the key identification code conversion means is provided in the smart keyless entry control means, the anti-theft device is a modification in which only the key identification code conversion means is provided in the smart keyless entry control means. The anti-theft property has the same effect as the first configuration.

  According to a fourth configuration relating to the present invention, the mechanical key can be stored in a housing portion formed in the portable device.

  According to the fourth configuration, the engine can be started normally without a key, and the engine can be started immediately using a mechanical key in the event of an emergency such as a failure of the portable device, thereby improving the convenience of passengers. . Also, if the mechanical key can be stored in the housing portion formed in the portable device, it is normal to hand the portable device to another person as a spare key for the mechanical key, and two mechanical keys such as the main mechanical key are provided. The act of passing the key and the sub mechanical key in a set can be avoided, and as a result, as described in the first configuration, the anti-theft property of the vehicle is improved.

  As described above, according to the present invention, when a smart keyless entry system is added to an immobilizer system, the configuration of the immobilizer system including a new mechanical key registration method is prevented from being changed as much as possible, and one is assigned to another person. Even if the mechanical key and the portable device are passed in a set state, it is possible to prevent the new mechanical key from being registered as a regular one and the vehicle from being easily stolen.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a vehicle antitheft device according to an embodiment of the present invention. This antitheft device transmits a key identification code wirelessly to a mechanical key 1 to prevent the vehicle from being stolen. An immobilizer system including a key identification code transmitter 1a as a means, and a portable device identification code transmitter 2a as a portable device identification code transmission means for a vehicle occupant to periodically transmit a portable device identification code wirelessly This is a combination with a smart keyless entry system that locks and unlocks the door of the vehicle and enables the engine of the vehicle to be started by carrying the portable device 2 containing the.

  The portable device 2 is formed with a housing portion 2b for storing the mechanical key 1 (main key M described later in the present embodiment) (in this embodiment, a housing hole for inserting the mechanical key 1 into one side surface portion of the portable device. The occupant can carry the portable device 2 in a set state in which the mechanical key 1 is stored in the housing portion 2b. When the engine is to be started with the mechanical key 1, the mechanical key 1 is taken out from the accommodating portion 2 b and inserted into an ignition key cylinder (not shown), and the ignition switch is turned on with the mechanical key 1. Operate the starter switch (not shown) in the ON state. However, as will be described later, when the portable device 2 is in the vehicle interior, the engine cannot be started with the mechanical key 1.

  As the key identification code transmitted from the key identification code transmitter 1 a of the mechanical key 1, a different code is set for each mechanical key 1. When the mechanical key 1 is inserted into the ignition key cylinder of the vehicle, the key identification code transmitted from the key identification code transmitter 1a of the mechanical key 1 is a key identification code disposed in the vicinity of the ignition key cylinder. This is received by the smart keyless entry control means 5 mounted on the vehicle via the receiver 6.

  In the smart keyless entry control means 5, all the same key identification codes as the plurality of regular mechanical keys 1 set for the vehicle are registered and stored. For example, in this embodiment, the main key M and the sub key S are initially set as the regular mechanical keys 1, the key identification code of the main key M is set as the key identification code a, and the key identification code of the sub key S is set as the key identification. As the code b, both the key identification codes a and b are registered in the smart keyless entry control means 5.

  Further, the smart keyless entry control means 5 is provided with a key identification code converting means 9. In this key identification code converting means 9, for example, the key identification code a of the main key M is the second key identification code. Convert to key identification code A. The same applies to the sub key S, and the key identification code b of the sub key S is converted into a key identification code B which is a second key identification code.

  In the key identification code conversion means 9, for example, the second key identification code is obtained by multiplying the number of the key identification code registered in the mechanical key 1 by a specific integer value, that is, according to a predetermined rule. Is converted to

  When the smart keyless entry control means 5 receives the key identification code transmitted from the key identification code transmitter 1a of the mechanical key 1 inserted into the ignition key cylinder, the smart keyless entry control means 5 authenticates the mechanical key 1 based on the key identification code. (This determination is performed every time the ignition switch is operated from the OFF state to the ON state by the mechanical key 1). That is, to turn on the ignition switch depending on whether or not the received key identification code matches one of a plurality of key identification codes registered in the smart keyless entry control means 5 mounted on the vehicle. It is determined whether or not the used mechanical key 1 is genuine.

  If it is determined that the mechanical key 1 is genuine, that is, the received key identification code matches one of a plurality of registered key identification codes, the key identification is performed. The code is converted into a second key identification code by the key identification code conversion means 9, and the converted second key identification code is transmitted to the engine control means 10. When the mechanical key 1 is not legitimate (when the received key identification code does not match any of the registered key identification codes), the mechanical key 1 The key identification code received from the key identification code transmitter 1a is transmitted to the engine control means 10 as it is.

  As the portable device identification code transmitted from the portable device identification code transmitter 2 a of the portable device 2, a different code is set for each portable device 2. When the occupant is outside the passenger compartment carrying the portable device 2, the portable device identification code transmitted from the portable device identification code transmitter 2a of the portable device 2 is installed outside the vehicle compartment of the vehicle. The data is received by the smart keyless entry control means 5 through the outdoor antenna 7 (portable device identification code receiver).

  The smart keyless entry control means 5 has a portable device identification code received via the antenna 7 outside the vehicle compartment, in which a portable device identification code registered in the smart keyless entry control means in advance (in this embodiment, for the vehicle The one mobile phone 2 is set and the same mobile phone identification code as that of the mobile phone 2 is registered). It is determined whether or not the portable device 2 is genuine, that is, when it is determined that the received portable device identification code matches the registered portable device identification code, The door lock actuator 12 is made according to the distance to the occupant, that is, the received electric field strength of the radio signal transmitted from the portable device identification code transmitter 2a of the portable device 2 carried by the occupant. It is to carry out the locking and unlocking of the door of the vehicle. That is, when the distance between the vehicle and the occupant is smaller than a predetermined value (the received electric field strength is larger than the predetermined value), the door is unlocked, while the distance between the vehicle and the occupant is equal to or larger than the predetermined value (reception When the electric field strength is smaller than a predetermined value), the door is locked.

  Further, when the occupant enters the vehicle interior of the vehicle with the portable device 2 carried (when the portable device 2 is in the vehicle interior), the portable device transmitted from the portable device identification code transmitter 2a of the portable device 2 The identification code is received by the smart keyless entry control means 5 via the vehicle interior antenna 8 (portable device identification code receiver) installed in the vehicle interior of the vehicle.

  The smart keyless entry control means 5 uses the portable device identification code transmitted from the portable device identification code transmitting means 2a of the portable device 2 via the vehicle interior antenna 8 as the portable device identification code. Based on this, it is determined whether or not the portable device 2 is genuine.

  That is, whether or not the portable device 2 is genuine for the vehicle depending on whether or not the portable device identification code received via the vehicle interior antenna 8 matches the registered and stored portable device identification code. When the portable device 2 is genuine, that is, when the received portable device identification code matches the portable device identification code registered and stored in the smart keyless entry control means 5, the smart keyless One of a plurality of key identification codes registered and stored in the entry control means 5 is selected, and the selected key identification code is converted into a second key identification code by the key identification code conversion means 9. Then, the converted second key identification code is transmitted to the engine control means 10. When it is determined that the portable device 2 is genuine, if it is subsequent to the regular determination of the regular mechanical key 1, a plurality of registered and stored in the smart keyless entry control means 5 is used. Of these key identification codes, the key identification code of the regular mechanical key 1 used most recently is selected. On the other hand, when the portable device 2 is not legitimate, that is, when it is determined that the received portable device identification code does not match the registered portable device identification code, any key identification code is a key. It is not converted by the identification code conversion means 9, and nothing is transmitted to the engine control means 10. Therefore, in this case, the engine cannot be started by an operation of turning an engine start knob 14 provided separately from an ignition key cylinder described later.

  The smart keyless entry control means 5 is provided with an ignition key cylinder while periodically receiving the portable device identification code transmitted from the portable device identification code transmitter 2a of the portable device 2 via the vehicle interior antenna 8. Even if the key identification code transmitted from the key identification code transmitter 1a of the mechanical key 1 inserted into is received, the determination as to whether or not the portable device 2 is legitimate is performed with priority. Therefore, even when the passenger carries the portable device 2 and operates the ignition switch from the OFF state to the ON state with the mechanical key 1, it is not determined whether or not the mechanical key 1 is authorized. Only the determination as to whether or not the portable device 2 is genuine is performed. The determination as to whether or not the mechanical key 1 is genuine is when the portable device identification code is not received periodically, and the ignition switch is operated from the OFF state to the ON state by the mechanical key 1. Sometimes once. Further, after the ignition switch is operated to the ON state by the mechanical key 1, even if the mobile device identification code is received, the portable device 2 is normal until the ignition switch is operated to the OFF state. This is not determined. Further, during the operation of the engine, it is not determined whether the mechanical key 1 or the portable device 2 is authorized.

  The smart keyless entry control means 5 is connected to an engine start detection means 13 (for example, an engine speed detection means) that detects that the engine of the vehicle has been started.

  When the engine control unit 10 receives the second key identification code transmitted from the smart keyless entry control unit 5 when the mechanical key 1 or the portable device 2 is properly determined, the engine control unit 10 sets the vehicle engine to a startable state, A start signal is transmitted to the engine starter 11 by operation. Specifically, the engine control means 10 has the same second key identification code (in this embodiment, the main key M as the key identification code of the regular mechanical key 1 converted by the key identification code conversion means 9). The key identification code A converted from the key identification code a by the key identification code conversion means 9 and the key identification code B converted from the key identification code b by the key identification code conversion means 9 are all registered and stored. ing. However, the key identification codes a and b of the regular mechanical key 1 are not registered in the engine control means 10. The engine control means 10 receives the second key identification code transmitted from the smart keyless entry control means 5, and the received second key identification code is registered and stored in the engine control means 10 in advance. It is determined whether or not it coincides with one of the second key identification codes, and when it coincides, the engine of the vehicle is brought into a startable state.

  The predetermined operation of the occupant is an operation in which the occupant carrying the portable device 2 in the passenger compartment rotates the engine starting knob 14 provided separately from the ignition key cylinder, or a mechanical key. When the portable device 2 is not carried or the portable device 2 is broken, the mechanical key 1 is inserted into the ignition key cylinder and turned to the ignition ON position. When the starter switch 14 is turned on by turning the start knob 14, the engine can be started without the mechanical key 1, that is, in a keyless state, which improves convenience for the passenger. To do.

  According to the vehicle antitheft device configured as described above, the key identification code of the mechanical key 1 is transmitted as it is to the engine control means 10 via the smart keyless entry control means 5 when the mechanical key 1 is determined to be unauthorized. Since only the second key identification code is registered and stored in the engine control means 10 and does not match the key identification code of the unauthorized mechanical key 1, the engine is not brought into a startable state.

  Furthermore, according to the vehicle antitheft device configured as described above, after the smart keyless entry control means 5 determines that the portable device 2 is genuine using the authorized portable device 2, the smart keyless device is used. The entry control means 5 is removed and the key identification code receiver 6 and the engine control means 10 are directly connected, and then a new mechanical key is inserted into the ignition key cylinder, and the key of the new mechanical key is inserted into the engine control means 10. Even if an attempt is made to register the identification code, since it does not go through the key identification code conversion means 9 provided in the smart keyless entry control means 5, the engine control means 10 will respond to the key identification code of this new mechanical key. Thus, the converted second key identification code is not registered and stored. Therefore, another person who borrows the vehicle, the portable device 2 and the set of the mechanical key 1 from the authorized owner connects the smart keyless entry control means 5 again as if nothing happened, and the authorized owner of the vehicle. Even if the vehicle, the portable device 2 and the set of the mechanical key 1 are returned to the vehicle, and then the vehicle is stolen with the new mechanical key, the engine control means 10 receives the second mechanical key corresponding to the new mechanical key. The key identification code is not registered and stored, and the vehicle can be prevented from being stolen.

  Next, the authorized owner of the vehicle registers and stores the key identification code of the new mechanical key 1 in the smart keyless entry control means 5 and also uses the engine control means 10 as the key identification code of the new mechanical key 1. A method for registering and storing the corresponding second key identification code will be described.

  The engine control means 10 performs a predetermined operation for registration by successively using two regular mechanical keys (main key M and sub key S) corresponding to the second key identification code already registered and stored therein. Thus, the second key identification code corresponding to the same key identification code as that of the new mechanical key 1 can be registered and stored in the engine control means 10 so that the new mechanical key 1 can be used as a regular one. Yes. Specifically, when the smart keyless entry control means 5 receives different key identification codes twice in succession, and then a new mechanical key 1 is inserted into the ignition key cylinder and a predetermined operation for registration is performed. The key identification code conversion means 9 provided in the smart keyless entry control means 5 additionally registers and stores the key identification code of the new mechanical key 1 inserted into the ignition key cylinder, and also the new mechanical key 1 The key identification code is converted into a new second key identification code by the key identification code conversion means 9, and the new second key identification code corresponding to the key identification code of the new mechanical key 1 is further converted into the engine control means. 10 and the engine control means 10 receives the new second key. It is registered and stored a different code. Note that the second key identification code of the new mechanical key 1 registered and stored here is a second key different from two regular mechanical keys (main key M and sub key S) registered and stored in advance. A third second key identification code different from the identification code is used.

  Here, the smart keyless entry control means 5 selects which of the registered second key identification codes to transmit to the engine control means 10 when the mechanical key 1 or the portable device 2 is properly determined. A description will be given based on the flowchart of FIG. This flow is a control flow until the smart keyless entry control means 5 receives the second identification code in the engine control means 10, and an engine control means for registering a new second key identification code. The control flow of 10 is not shown.

  First, in step S1, it is determined whether the key identification code is received via the key identification code receiver 6 or the portable device identification code is received via the vehicle interior antenna 8, and the portable device identification code is received. If it is determined, the process proceeds to step S2 to determine whether or not the portable device 2 is genuine. When the determination in step S2 is YES, the process proceeds to step S3, and the key identification code that is the same as the mechanical key 1 that has been normally determined most recently for the normal determination of the portable device 2 is converted by the key identification code conversion means 9 into the second key. When converted to a key identification code, the second key identification code (set as the second key identification code A at the time of factory shipment) is transmitted to the engine control means 10 and the process ends. On the other hand, when the determination in step S2 is NO That is, when it is determined that the portable device 2 is not legitimate, the process ends without doing anything.

  When it is determined in step S1 that the key identification code has been received, the process proceeds to step S4 to determine whether or not the mechanical key 1 is genuine. When the determination in step S4 is NO, the process proceeds to step S5, where the key identification code received in the determination is converted into a new second key identification code by the key identification code conversion means 9, and the new second key identification code is converted. The key identification code is transmitted to the engine control means 10 and the process is terminated.

  On the other hand, if the determination in step S4 is YES, that is, if it is determined that the currently used mechanical key 1 is authentic, the process proceeds to step S6, where the first mechanical following the normal determination of the portable device 2 is performed. It is determined whether or not the key 1 is properly determined. Here, the normal determination of the first mechanical key 1 following the normal determination of the portable device 2 is the normal determination of the mechanical key 1 following the normal determination of the portable device 2 or the normal determination of the portable device 2. When the normal determination of the mechanical key 1 is performed twice or more consecutively, the received key identification code is continuously received from the first normal determination of the mechanical key 1 at the second and subsequent normal determinations of the mechanical key 1. The judgment when it is the same. More specifically, it is determined whether or not the key identification code a of the regular main key M has been received following the portable device 2, or the key identification code of the regular main key M following the portable device 2. This is to determine whether or not a key identification code a of the regular main key M has been received.

  When the determination in step S6 is NO, that is, when it is determined that the mechanical key 1 used subsequent to the portable device 2 is not an authorized one, or the mechanical key 1 used subsequent to the portable device 2 When it is determined that the mechanical key 1 that has been used is not a regular one, the process proceeds to step S5. On the other hand, when the determination is YES, the process proceeds to step S7, where the engine start detection means 13 determines whether or not the engine has been started with the first mechanical key 1 following the normal determination of the portable device 2. That is, after the normal determination of the mechanical key 1 after the normal determination of the portable device 2, the normal determination of the mechanical key 1 is performed after the first determination of the mechanical key 1 after the second determination. It is determined whether or not it is detected that the engine has been started. When the determination in step S7 is YES, the process proceeds to step S5. On the other hand, when the determination in step S7 is NO, that is, when it is detected that the engine has been started after the first regular determination of the mechanical key 1, Proceeding to S8, the key identification code used for the normal determination of the portable device 2 immediately before the normal determination of the first mechanical key 1 is converted into the second key identification code by the key identification code converting means 9, and the second key The identification code is transmitted to the engine control means 10 and the process is terminated.

  That is, the smart keyless entry control means 5 converts the same key identification code as that of the mechanical key 1 that has been legitimately determined most recently into the second key identification code by the key identification code conversion means 9 when the portable device 2 is legitimately determined. Then, the second key identification code is transmitted to the engine control means 10, and when the mechanical key 1 is normally determined following the normal determination of the portable device 2, the normal determination of the portable device 2 immediately before the normal determination of the mechanical key 1 is performed. The key identification code used at the time is converted into a second key identification code by the key identification code conversion means 9, the second key identification code is transmitted to the engine control means 10, and further, following the normal determination of the portable device 2 The key identification received when the mechanical key 1 is judged normally for the second and subsequent times when the mechanical key 1 is judged for two or more consecutive times. When the mode is continuously the same from the time of the normal determination of the first mechanical key 1 (that is, at the time of the normal determination of the first mechanical key 1), the mobile phone immediately before the normal determination of the first mechanical key 1 The key identification code used at the time of the normal determination of the machine 2 is converted into the second key identification code by the key identification code conversion means 9, and the second key identification code is transmitted to the engine control means 10.

  Therefore, after using the mechanical key 1 (for example, the main key M) and passing the mechanical key 1 and the portable device 2 to another person in a set state, how the other person uses the portable device 2 or the mechanical key 1 Even then, only the second key identification code A is transmitted to the engine control means 10. Subsequently, even if the engine control means 10 receives a new second key identification code, the engine control means 10 cannot register the new second key identification code. This will be described with reference to FIG. 3 which is a schematic diagram showing permission and non-permission of registration of a new mechanical key in the engine control means 10 that has received the second key identification code. As shown in FIG. Since only the second key identification code A is transmitted, the new mechanical key 1 is not registered.

  In addition, the smart keyless entry control means 5 receives the reception of the mechanical key 1 for the second and subsequent regular determinations when the mechanical key 1 is determined for two or more consecutive times following the normal determination of the portable device 2. At the time of normal determination of the mechanical key 1 after the first time the key identification code is different from the previous normal determination of the mechanical key 1 (that is, at the time of normal determination of the second mechanical key), A second key identification code corresponding to the same key identification code as key 1 (second mechanical key) is transmitted to engine control means 10. That is, also in this case, as shown in FIG. 3 (1), only the second key identification code A is continuously transmitted, so that a new mechanical key 1 is not registered.

  Furthermore, the smart keyless entry control means 5 receives the reception of the mechanical key 1 for the second and subsequent regular determinations when the mechanical key 1 is determined for two or more consecutive times following the normal determination of the portable device 2. The engine start detecting means 13 starts the engine after the first determination of the mechanical key 1 even if the key identification code is the same continuously from the first determination of the normal determination of the mechanical key 1. When the mechanical key 1 is detected after the engine start is detected, the same key identification code as that of the mechanical key 1 subjected to the regular determination is converted into the second key identification code by the key identification code conversion means 9. Then, the second key identification code is transmitted to the engine control means 10. That is, also in this case, as shown in FIG. 3 (1), only the second key identification code A is continuously transmitted, so that a new mechanical key 1 is not registered.

  For example, at the time of the normal determination of the portable device 2 following the normal determination of the main key M, the same key identification code as the main key M which is the mechanical key 1 that has been normally determined most recently is the second key identification code (that is, the main key M When the second key identification code A) corresponding to the M key identification code a) is converted, the second key identification code is transmitted to the engine control means 10, and then the normal determination of the portable device 2 continues. Each time the portable device 2 is properly determined, the same key identification code as the main key M, which is the mechanical key 1 that has been most recently normally determined, is converted into the second key identification code. That is, the second key identification code A corresponding to the key identification code a of the main key M is transmitted to the engine control means 10.

  When the main key M is normally determined following the normal determination of the portable device 2, the key identification code A (the number transmitted to the engine control means 10 during the normal determination of the portable device 2 immediately before the main key M is normally determined). 2) is transmitted to the engine control means 10, and the normal determination of the main key M is continued twice or more following the normal determination of the portable device 2 (the received key identification code a is the first mechanical identification code A). In the case of the normal determination of the key 1, the second key identification code A corresponding to the key identification code a (the normality of the first mechanical key 1) The second key identification code A transmitted to the engine control means 10 at the time of the normal determination of the portable device 2 immediately before the determination is transmitted to the engine control means 10 (in this example, the engine is started with the main key M). Second engine identification code corresponding to the key identification code a is transmitted to the engine control unit 10 without).

  At the time of the normal determination of the sub key S following the normal determination of the main key M (when the received key identification code is different for the first time from the previous normal determination of the mechanical key 1, that is, the key identification code b following the key identification code a) Is received), the key identification code b is converted to the second key identification code B (the second key identification code corresponding to the same key identification code as the mechanical key 1 determined to be normal) by the key identification code conversion means 9. The second key identification code B is transmitted to the engine control means 10. At the subsequent normal determination of the mechanical key 1 (when the received key identification code is different from the previous normal determination of the mechanical key 1 for the first time after the normal determination of the mechanical key 1), The same key identification code as the key is sent by the key identification code conversion means 9 to the second key identification code (second key identification code A for the main key M, second key identification code B for the sub key S). And the second key identification code is transmitted to the engine control means 10. That is, in this case, as shown in FIG. 3 (2), different second key identification code A and second key identification code B are successively determined, so that a new mechanical key 1 can be registered. It becomes.

  As another example, the identification code b of the sub key S is converted into the second key identification code B by the key identification code conversion means 9 at the time of the normal determination of the portable device 2 following the normal determination of the sub key S. Key identification code B is transmitted to the engine control means 10, and thereafter, when the regular determination of the portable device 2 continues, the second key identification code B is the engine control means for each regular determination of the portable device 2. 10 will be transmitted. When the main key M is normally determined following the normal determination of the portable device 2, the second key identification code B is transmitted to the engine control means 10, and the normal determination of the main key M is performed following the normal determination of the portable device 2. Is continuously transmitted twice or more, the second key identification code B is transmitted to the engine control means 10 every time the main key M is properly determined. However, when the main key M is properly determined after it has been detected that the main key M has been started, the second key identification code A corresponding to the key identification code a of the main key M (the normal determination is performed). The same second key identification code A) as the main key M which is the mechanical key 1 is transmitted to the engine control means 10.

  In the simplest explanation, the main key M and then the sub key S (or vice versa, ie, the sub key S followed by the main key M) are different from each other except that the key is inserted into the ignition key cylinder. This means that the smart keyless entry control means 5 cannot receive the identification code.

  Therefore, when both the main key M and the portable device 2 are delivered in a set state in order to lend the vehicle to another person, if the other person passes the main key M in the set state after using the main key M, the other person will receive the main key M and the portable device 2. In any case, only the second key identification code A corresponding to the same key identification code a as the main key M is transmitted to the engine control means 10. As a result, it is possible to register a new mechanical key 1 by performing a predetermined operation for registration by continuously using the main key M and the sub key S which are two regular mechanical keys 1. Since the other person has only the main key M of the two regular mechanical keys 1, the new mechanical key 1 cannot be registered.

  Moreover, the key identification code converting means 9 provided in the smart keyless entry control means 5 converts the key identification code for each mechanical key 1 (main key M and sub key S) into a second key identification code, Since the converted second key identification code is transmitted to the engine control means 10, after authenticating the smart keyless entry control means 5 using the authorized portable device 2, the smart keyless entry control means. 5 is removed, and the key identification code receiver 6 and the engine control means 10 are directly connected. Then, a new mechanical key is inserted into the ignition key cylinder, and the key identification code of the new mechanical key is registered in the engine control means. Smart keyless even with a malicious trick The key identification code of the new mechanical key to over control unit 5, and will not be the second key identification code of the new mechanical key to the engine control unit 10 is registered and stored.

  Therefore, a smart keyless entry system can be easily added with almost no change in the configuration of the engine control means 10 in the conventional immobilizer system, and at the same time, both anti-theft and new mechanical key 1 registration workability can be achieved. Can be improved.

  INDUSTRIAL APPLICABILITY The present invention is useful for a vehicle antitheft device combining an immobilizer system and a smart keyless entry system. In particular, a new mechanical key is illegally registered while the configuration of the immobilizer system is not changed as much as possible. This is useful in preventing

1 is a schematic configuration diagram showing a vehicle antitheft device according to an embodiment of the present invention. Flowchart diagram showing smart keyless entry control procedure Schematic diagram showing new mechanical key registration permission and disapproval processing in engine control means

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mechanical key 1a ... Key identification code transmitter 2 ... Portable machine 2a ... Portable machine identification code transmitter 2b ... Storage part 5 ... Smart keyless entry control means 9 ... Key identification code conversion means 10 ... engine control means 13 ... engine start detection means

Claims (4)

When the mechanical key inserted into the ignition key cylinder of the vehicle is an authorized mechanical key of the vehicle, the engine of the vehicle can be started and the door of the vehicle carried by the vehicle occupant is unlocked / unlocked Even if the portable device is a regular portable device of the vehicle, a vehicle antitheft device that enables the engine of the vehicle to be started,
A key identification code transmitting means provided on the mechanical key for transmitting a key identification code; a portable machine identification code transmitting means provided on the portable device for transmitting a portable machine identification code;
The key identification code transmitted by the key identification code transmitting means can be received, and when the portable machine identification code transmitted by the portable machine identification code transmitting means is received, the door can be locked and unlocked. Smart keyless entry control means,
Engine control means that permits or disallows starting of the engine of the vehicle;
Key identification code conversion means for converting the key identification code transmitted from the key identification code transmission means into a second key identification code;
The smart keyless entry control means can be registered with the same key identification code as the mechanical key, and the engine control means has a second key identification code converted by the key identification code conversion means in advance. Registered,
When the engine control means receives the second key identification code via the key identification code conversion means, the engine control means obtains the received second key identification code and a pre-registered second key identification code. An anti-theft device for a vehicle, wherein the vehicle engine is configured to be in a startable state when they are collated and match.   In Claim 1, when the smart keyless entry control means determines that the mechanical key and the portable device are consecutive ones of the vehicle, the smart keyless entry control means sends the engine control means to the engine control means. The second key identification code which is the same as the second key identification code transmitted most recently is transmitted to the engine control means, and the engine control means is provided with a second key identification code which is continuously different from each other. The vehicle antitheft device is characterized in that a new second key identification code can be registered for the first time after receiving.   3. The vehicle antitheft device according to claim 1, wherein the key identification code conversion means is provided in the smart keyless entry control means.   4. The vehicle antitheft device according to claim 1, wherein the mechanical key can be stored in a storage portion formed in a portable device. 5.

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