JP2005170191A - Anti-theft device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hold a constitution of an immobilizer system including a registration method of a new mechanical key unchanged as much as possible when a smart keyless entry system is added to the immobilizer system, and to prevent the new mechanical key 1 from being fraudulently registered even if a set of one mechanical key and a portable unit 2 are given to a third person. <P>SOLUTION: The anti-theft device for the vehicle is constituted such that a smart keyless entry control unit 5 performs collation of key discrimination code in addition to collation of portable unit discrimination code and upon regular determination that it is determined that the mechanical key 1 or the portable unit 2 is regular, the same key discrimination code as any one of a plurality of regular mechanical keys 1 is transmitted to an engine control unit 10. The key discrimination code transmitted to the engine control unit 10 is made to have the same key discrimination code so long as one mechanical key 1 and the portable unit 2 are used. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, when the mechanical key inserted into the ignition key cylinder of the vehicle is a regular mechanical key of the vehicle, or the portable device for locking and unlocking the door of the vehicle carried by the vehicle occupant is provided in the vehicle. In the case of a legitimate portable device, the present invention belongs to a technical field relating to a vehicle antitheft device that can start an engine of the vehicle.

  Conventionally, as shown in Patent Document 1, for example, an immobilizer system for preventing theft of a vehicle is well known. In this system, a transmitter that transmits a key identification code to a mechanical key is built in, and when this mechanical key is inserted into an ignition key cylinder of a vehicle, the key identification code transmitted from the transmitter is the ignition key cylinder. The key identification code is transmitted to the engine control unit by being received by a nearby receiver. This engine control unit compares the received key identification code with a key identification code registered in advance in the engine control unit or the like. The engine can be started, so that the occupant can start the engine with the mechanical key.

In recent years, for example, as shown in Patent Document 2, 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 a portable device identification code registered in the smart keyless entry control unit or the like in advance. The door of the vehicle is locked and unlocked according to the received electric field strength of the radio signal transmitted from the transmitter of the portable device. 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 intermediate part connecting the receiver that receives the key identification code transmitted from the transmitter of the mechanical key 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 settings are made 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.

  In addition, for the convenience of keyless, the occupant normally starts the engine without the key, and uses the mechanical key to start the engine in the event of a failure of the portable device. It is preferable for the passenger to be able to accommodate.

  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 and sub key) corresponding to the key identification code already registered in the engine control unit or the like are continuously used to perform a predetermined operation. . That is, when the engine control unit receives two different key identification codes in succession, the engine control unit enters a registerable state. In this state, when a new mechanical key is inserted into the ignition key cylinder and a predetermined operation is performed, the new operation is performed. The same key identification code as the mechanical key is registered in the engine control unit or the like. In this way, a new mechanical key can be easily registered while securing theft resistance.

  However, in the configuration in which the smart keyless entry system is added to the immobilizer system that can register a new mechanical key as described above, when a vehicle is rented to another person, a new mechanical key is illegally registered by others. There is a risk. In other words, when lending a vehicle to another person, it is common to hand over the other person with one mechanical key and a portable device set, and if another person uses the mechanical key and the portable device continuously, There is a possibility that the smart keyless entry control unit may send different key identification codes to the engine control unit twice in succession. In this case, as in the case of using two mechanical keys continuously, the engine control unit Different key identification codes are received twice in succession, which makes it possible to illegally register a new mechanical key.

  The present invention has been made in view of such points, and an object of the present invention is to provide a configuration of an immobilizer system including a new mechanical key registration method when a smart keyless entry system is added to the immobilizer system. In order to prevent unauthorized registration of a new mechanical key even if it is handed over to another person with one mechanical key and a portable device set.

  In order to achieve the above object, according to the present invention, the control means performs verification of the key identification code in addition to verification of the portable device identification code, and determines that the mechanical key or the portable device is genuine. A key identification code that is the same as any one of a plurality of regular mechanical keys is transmitted to the engine control unit at the time of a certain regular determination, and the key identification code transmitted to the engine control unit is one mechanical key. And the same key identification code as long as the mobile device is used.

  Specifically, in the first aspect of the invention, when the mechanical key inserted into the ignition key cylinder of the vehicle is a regular mechanical key of the vehicle, or the vehicle door is carried by a passenger of the vehicle. An object of the present invention is a vehicle antitheft device that allows the engine of the vehicle to be started when the lock portable device is an authorized portable device of the vehicle.

  And 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 the portable machine identification code; and inserted into the ignition key cylinder. When the key identification code transmitted from the key identification code transmission means of the received mechanical key is received, it is determined based on the key identification code whether the mechanical key is authentic, When the portable machine identification code transmitted from the machine identification code transmitting means is received, it is determined whether or not the portable machine is genuine based on the portable machine identification code, and the mechanical key or portable machine is The key identification code transmitting means set for the vehicle at the time of normal determination, which is determination as being normal Control means for transmitting the same key identification code as any one of a plurality of regular mechanical keys having different key identification codes to be transmitted to an engine control unit that controls the engine of the vehicle, At the time of normal determination of the portable device, the control means transmits the same key identification code as the mechanical key that has been normally determined most recently to the engine control unit, and at the time of normal determination of the mechanical key following the normal determination of the portable device, The key identification code transmitted to the engine control unit at the time of normal determination of the portable device immediately before the normal determination of the mechanical key is transmitted to the engine control unit. At the time of the regular determination of the mechanical key after the second time when the determination is made, The key identification code transmitted to the engine control unit at the time of normal determination of the portable device immediately before the normal determination of the first mechanical key is The engine control unit is configured to transmit to the engine control unit, and the engine control unit starts the engine of the vehicle when receiving a mechanical key or a key identification code transmitted at the time of normal determination of the portable device from the control means. Assume that it is configured to be in a possible state.

  With the above configuration, the control means controls the engine with the same key identification code as any one of the mechanical keys of the regular mechanical keys, regardless of whether the mechanical keys are properly determined or the portable device is normally determined. Since it is transmitted to the unit, an engine control unit similar to a conventional immobilizer system can be used. That is, the engine control unit of the conventional immobilizer system determines whether the key identification code received by the engine control unit matches the key identification code registered in the engine control unit or the like in advance. By registering the same key identification code as the mechanical key, it will be determined that they match, and as a result, when the key identification code transmitted when the mechanical key or portable device is properly determined is received from the control means, the vehicle Make the engine ready to start. And if you set and pass a mechanical key and a portable device to lend a vehicle to another person, if you set and pass it after using the mechanical key, how can others pass the mechanical key and the portable device? Even if it is used, only the same key identification code as that mechanical key is transmitted to the engine control unit. Therefore, even if it is possible to register a new mechanical key by continuously using two regular mechanical keys and performing a predetermined operation, it is not possible for another person to illegally register a new mechanical key. Can not. Therefore, a smart keyless entry system can be easily added with almost no change in the configuration of the engine control unit in the conventional immobilizer system, and both the anti-theft and new mechanical key registration workability are improved. be able to.

  According to a second aspect of the present invention, in the first aspect of the present invention, the same key identification code as that of a regular mechanical key is registered in each of the control means and the engine control unit.

  According to a third aspect of the present invention, in the second aspect of the invention, when the control means receives the key identification code, the control means uses the key identification code among the plurality of key identification codes registered in the control means. It is determined whether or not the mechanical key is authentic depending on whether or not it matches one, and at the time of normal determination of the mechanical key or the portable device, of the plurality of key identification codes registered in the control means One is transmitted to the engine control unit, the engine control unit receives the key identification code transmitted from the control means, and the key identification code is registered in the engine control unit. It is assumed that the vehicle engine is brought into a startable state when it matches one of the plurality of key identification codes.

  According to the inventions of claims 2 and 3, it is possible to reliably determine whether the mechanical key is proper or not by the engine control unit in the conventional immobilizer system, instead of the engine control unit. become. In addition, when the mechanical key or the portable device is properly determined by the control means, the engine control unit always makes the vehicle engine startable.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the control means performs the second determination when the mechanical key is determined to be normal two or more times following the normal determination of the portable device. When the received key identification code is different for the first time from the previous mechanical key normal determination, the same key identification code as that of the mechanical key that has been determined as normal Is transmitted to the engine control unit.

  Thus, as long as the same mechanical key is used continuously after the portable device is used, the key identification code transmitted to the engine control unit at the time of regular determination of the portable device is transmitted to the engine control unit. At the time of normal determination after the use of the key, the same key identification code as the mechanical key determined to be normal is transmitted to the engine control unit. Therefore, if there are two mechanical keys, different key identification codes can be transmitted to the engine control unit twice in succession, and a new mechanical key can be easily registered. Become.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, an engine start detecting means for detecting that the engine has started is provided, and the control means is performed two or more times following the normal determination of the portable device. At the time of normal determination of the second and subsequent mechanical keys when the mechanical key is normally determined, even if the received key identification code is the same continuously from the time of the first mechanical key normal determination, When the engine start detecting means detects that the engine has been started after the first mechanical key is determined to be normal, the mechanical key that has been determined to be normal is determined when the mechanical key is determined to be normal after the engine start is detected. The same key identification code is transmitted to the engine control unit.

  In this way, if the engine is started with the mechanical key, the same key identification code as that of the mechanical key determined to be properly transmitted is transmitted to the engine control unit when the mechanical key is correctly determined after the engine is started. Therefore, similarly to the invention of claim 4, if there are two mechanical keys, different key identification codes can be transmitted to the engine control unit twice in succession, and a new mechanical key is registered. Can be easily performed.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the mechanical key is configured to be storable in a housing portion formed in the portable device.

  As a result, the engine can be started normally without a key, and the engine can be started immediately using the mechanical key in the event of an emergency such as a failure of the portable device, thereby improving the convenience of the passenger.

  As described above, according to the vehicle antitheft device of the present invention, a smart keyless entry system can be easily added with almost no change in the configuration of the engine control unit in the conventional immobilizer system, and theft resistance is also improved. And new mechanical key registration workability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail 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 transmission as a portable device identification code transmission means in which a vehicle occupant periodically transmits a portable device identification code wirelessly This is a combination with a smart keyless entry system in which the portable device 2 incorporating the device 2a is carried, whereby the door of the vehicle is locked and unlocked and the vehicle engine can be started.

  The portable device 2 is formed with a housing portion 2b for storing the mechanical key 1 (a main key to be described later in this embodiment) (in this embodiment, the mechanical key 1 is inserted 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. When the engine is to be started with the mechanical key 1, the mechanical key 1 is taken out from the housing 2b and inserted into the ignition key cylinder. After the ignition switch is turned on with the mechanical key 1, the starter switch is turned on. Turn it on. However, as will be described later, the engine cannot be started with the mechanical key 1 if the portable device 2 is in the vehicle interior.

  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 the key identification arranged in the vicinity of the ignition key cylinder. It is received via the code receiver 6 by the smart keyless entry control unit 5 as control means mounted on the vehicle.

  In the smart keyless entry control unit 5, all the same key identification codes as the plurality of regular mechanical keys 1 set for the vehicle are registered and stored. In this embodiment, the main key and the sub key are initially set as the regular mechanical key 1, the key identification code of the main key is the key identification code 1, and the key identification code of the sub key is the key identification code 2. Both key identification codes 1 and 2 are registered in the smart keyless entry control unit 5 (may be registered and stored in a storage device different from the smart keyless entry control unit 5).

  When the smart keyless entry control unit 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 unit 5 performs the mechanical key 1 based on the key identification code. Is determined whether or not it is a regular one (note that this determination is performed every time the ignition switch is turned ON from the mechanical key 1). That is, whether or not the mechanical key 1 is genuine 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 unit 5. It comes to judge. When the mechanical key 1 is genuine (when the received key identification code matches one of the registered key identification codes), the plurality of regular keys are used. The same key identification code as any one of the mechanical keys 1 among the mechanical keys 1, that is, one of a plurality of key identification codes registered in the smart keyless entry control unit 5 (not necessarily the same as the received key identification code) (In this embodiment, it is either one of the key identification codes 1 and 2, which key identification code is specifically transmitted will be described later)), an engine control unit for controlling the engine of the vehicle 10 is transmitted. Further, when the mechanical key 1 is not legitimate (the received key identification code does not match any of the registered key identification codes), the key identification code of the mechanical key 1 is determined. The key identification code received from the transmitter 1a is transmitted to the engine control unit 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 a vehicle installed outside the vehicle compartment of the vehicle. The data is received by the smart keyless entry control unit 5 through the outdoor antenna 7 (portable device identification code receiver). The smart keyless entry control unit 5 has a portable device identification code received via the antenna 7 outside the vehicle compartment, in which the portable device identification code is registered and stored in the smart keyless entry control unit 5 in advance (in this embodiment, the vehicle One portable device 2 is set for use and the same portable device identification code as that portable device 2 is registered). At the time of normal determination, which is a determination that the portable device 2 is genuine (the received portable device identification code matches the registered portable device identification code), Depending on 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, the door lock actuator 12 Is actuated perform 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 reception 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 (the reception above). When the electric field strength is below a predetermined value), the door is locked.

  When the occupant enters the vehicle compartment with the portable device 2 carried (when the portable device 2 is in the vehicle compartment), the portable device identification code transmitted from the portable device identification code transmitter 2a of the portable device 2 is The smart keyless entry control unit 5 receives the signal via a vehicle interior antenna 8 (portable device identification code receiver) installed in the vehicle interior of the vehicle.

  Even when the smart keyless entry control unit 5 receives the portable device identification code transmitted from the portable device identification code transmitter 2a of the portable device 2 through the vehicle interior antenna 8, it is based on the portable device identification code. 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 portable device identification code. When the normal determination is a determination that the portable device 2 is genuine (the received portable device identification code matches the portable device identification code registered in the smart keyless entry control unit 5), The same key identification code as any one of the plurality of regular mechanical keys 1, that is, one of the plurality of key identification codes registered in the smart keyless entry control unit 5 (in this embodiment, the key identification code One of the identification codes 1 and 2 but which key identification code is specifically transmitted will be described later). It is adapted to transmit to the door 10. In addition, when the portable device 2 is not authorized (ie, when the received portable device identification code does not match the registered portable device identification code), any key identification code is assigned to the engine control unit. Do not send to 10.

  The smart keyless entry control unit 5 receives the ignition key 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 when the key identification code transmitted from the key identification code transmitter 1a of the mechanical key 1 inserted into the cylinder is received, the determination as to whether or not the portable device 2 is genuine is made with priority. Therefore, even if the ignition key is turned from OFF to ON with the mechanical key 1 in the state where the occupant carries the portable device 2, it is not determined whether or not the mechanical key 1 is a regular one. Only a determination is made as to whether 2 is legitimate. Whether the mechanical key 1 is authorized is determined once when the portable device identification code is not periodically received and the ignition switch is turned from OFF to ON by the mechanical key 1. . Further, after the ignition switch is turned on by the mechanical key 1, even if the portable device identification code is received, it is determined whether or not the portable device 2 is genuine until the ignition switch is turned off. Absent. 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 unit 5 is connected to an engine start detecting means 13 (for example, a starter switch or an engine speed detection sensor) that detects that the engine of the vehicle has started.

  The engine control unit 10 is configured to make the vehicle engine startable when the 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 is received. Has been. Specifically, the engine control unit 10 has the same configuration as that used in a conventional immobilizer system, and has the same key identification code as that of the regular mechanical key 1 as in the smart keyless entry control unit 5. (In this embodiment, all of the key identification codes 1 and 2) are registered and stored (may be registered and stored in a storage device or the like different from the engine control unit 10). The engine control unit 10 receives the key identification code transmitted from the smart keyless entry control unit 5, and the received key identification code is a plurality of key identification codes registered in the engine control unit 10. It is determined whether or not it matches one of these, and when it is determined that they match, the vehicle engine is brought into a startable state. That is, the 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 matches one of the plurality of key identification codes registered in the engine control unit 10. When the key identification code is received, the engine control unit 10 determines that the key identification code matches one of a plurality of registered key identification codes. Is ready to start.

  When the engine control unit 10 is ready to start the engine in this way, an occupant carrying the portable device 2 in the vehicle interior rotates an engine start knob provided separately from the ignition key cylinder. The starter switch is turned on and the engine can be started without a key. Further, when only the mechanical key 1 is carried and the portable device 2 is not carried, or when the portable device 2 is out of order, the engine can be started with the mechanical key 1.

  In addition, since the key identification code transmitted from the smart keyless entry control unit 5 at the time of the irregular determination of the mechanical key 1 does not match one of a plurality of key identification codes registered in the engine control unit 10, The engine control unit 10 does not make the vehicle engine startable. However, as described below, when the same key identification code as that of the new mechanical key 1 is registered in the engine control unit 10, the engine of the vehicle is brought into a startable state.

  The engine control unit 10 performs a predetermined operation by continuously using two regular mechanical keys (main key and sub key) corresponding to a key identification code already registered in the engine control unit, thereby creating a new mechanical control unit. The same key identification code as that of the new mechanical key 1 can be registered in the engine control unit 10 so that the key 1 can be used as a regular one. That is, when the engine control unit 10 receives different key identification codes twice consecutively, the engine control unit 10 enters a registerable state. When the occupant inserts a new mechanical key 1 into the ignition key cylinder and performs a predetermined operation in this state. When the engine is ready to start, the same key identification code as that of the new mechanical key 1 is registered in the engine control unit 10, and the key identification code is also registered in the smart keyless entry control unit 10 together with this registration. It has become.

  Here, the key identification code that the smart keyless entry control unit 5 transmits to the engine control unit 10 when the mechanical key 1 or the portable device 2 is properly determined will be described with reference to the flowchart of FIG.

  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. When 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 same key identification code as the mechanical key 1 that has been normally determined most recently for the normal determination of the portable device 2 (set as the key identification code 1 when shipped from the factory). Is transmitted to the engine control unit 10 and the process ends. On the other hand, if the determination in step S2 is NO, the process ends without performing anything.

  If 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, and the key identification code received in the determination is transmitted to the engine control unit 10 as it is, and the process ends.

  On the other hand, when the determination in step S4 is YES, the process proceeds to step S6, and it is determined whether or not the first mechanical key 1 is determined to be normal following the normal determination of the portable device 2. Here, the normal determination of the first mechanical key 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 2 following the normal determination of the portable device 2. The received key identification code is the same continuously from the first normal determination of the mechanical key 1 in the second and subsequent normal determinations of the mechanical key 1 when the normal determination of the mechanical key 1 is performed more than once. The regular judgment when it is.

  When the determination in step S6 is NO, the process proceeds to step S5. On the other hand, when the determination is YES, the process proceeds to step S7, and the engine start detection means 13 performs the first determination following the normal determination of the portable device 2. It is determined whether or not the engine has been started with the mechanical key 1. That is, after the normal determination of the mechanical key 1 in the second and subsequent mechanical keys 1 when the normal determination of the mechanical key 1 is continuously performed twice or more following the normal determination of the portable device 2, after the first normal determination of the mechanical key 1 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, the process proceeds to step S8 and the normality of the portable device 2 immediately before the normal determination of the first mechanical key 1 is performed. The key identification code transmitted to the engine control unit 10 at the time of determination is transmitted to the engine control unit and the process ends.

  Therefore, the smart keyless entry control unit 5 transmits to the engine control unit 10 the same key identification code as that of the mechanical key 1 that has been most recently legitimately determined when the portable device 2 is properly determined. When the mechanical key 1 subsequent to the normal determination is transmitted, the key identification code transmitted to the engine control unit 10 at the normal determination of the portable device 2 immediately before the normal determination of the mechanical key 1 is transmitted to the engine control unit 10. When the mechanical key 1 is normally determined two or more times after the normal determination, the received key identification code is the first normal determination of the mechanical key 1 at the second and subsequent normal determinations of the mechanical key 1. When it is the same continuously from the time (that is, when the first mechanical key is properly judged) Sends a key identification code transmitted to the engine control unit when the regular determination of the portable unit 2 normal judgment immediately before the first mechanical key 1 to the engine control unit 10.

  In addition, the smart keyless entry control unit 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. When the key identification code is different from the last time when the mechanical key 1 is properly determined for the first time, when the mechanical key 1 is normally determined (that is, when the second mechanical key is normally determined), The same key identification code as 1 (second mechanical key) is transmitted to the engine control unit 10.

  Further, the smart keyless entry control unit 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 this is detected, the same key identification code as that of the mechanical key 1 that has been properly determined is transmitted to the engine control unit 10 when the mechanical key 1 is determined to be normal after detection of the engine start.

  For example, at the time of normal determination of the portable device 2 following the normal determination of the main key, the key identification code 1 (the same key identification code as the mechanical key 1 that has been normally determined most recently) is transmitted to the engine control unit 10 and then the portable When the normal determination of the machine 2 continues, the key identification code 1 (the same key identification code as the mechanical key 1 that has been normally determined most recently) is transmitted to the engine control unit 10 for each normal determination of the portable machine 2. Will be.

  Then, at the time of normal determination of the main key following the normal determination of the portable device 2, the key identification code 1 (the key identification code transmitted to the engine control unit 10 at the normal determination of the portable device 2 immediately before the main key normal determination) is the engine. Transmitted to the control unit 10 and subsequent to the normal determination of the portable device 2, the main key normal determination continues two or more times (the received key identification code is the same continuously from the time of the first mechanical key 1 normal determination) If the main key is properly determined, the key identification code 1 (the key identification code transmitted to the engine control unit 10 during the normal determination of the portable device 2 immediately before the normal determination of the first mechanical key 1) is obtained. The key identification code 1 is transmitted to the engine control unit 10 (in this example, whether or not the engine is started with the main key). It is sent to the door 10).

  At the time of sub key normal determination following the main key normal determination (when the received key identification code is different for the first time from the previous mechanical key 1 normal determination), the key identification code 2 (the mechanical key determined to be normal) 1 is transmitted to the engine control unit 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 (key identification code 1 for the main key and key identification code 2 for the sub key) is transmitted to the engine control unit 10.

  As another example, when the portable device 2 is properly determined following the normal determination of the sub key, the key identification code 2 is transmitted to the engine control unit 10, and thereafter when the normal determination of the portable device 2 continues, The key identification code 2 is transmitted to the engine control unit 10 every time the portable device 2 is properly determined. At the time of normal determination of the main key following the normal determination of the portable device 2, the key identification code 2 is transmitted to the engine control unit 10, and the normal determination of the main key is performed twice or more following the normal determination of the portable device 2. If they are consecutive, the key identification code 2 is transmitted to the engine control unit 10 every time the main key is properly determined. However, at the time of normal determination of the main key after it is detected that the engine is started with the main key, the key identification code 1 (the same key identification code as the mechanical key 1 determined to be normal) is sent to the engine control unit 10. Sent.

  Therefore, when both the main key 1 and the portable device 2 are set and handed over to lend the vehicle to another person, if the main key is used and then set and handed over, the other person passes the main key and the portable device 2 over. Whatever the use, only the same key identification code (key identification code 1) as that main key is transmitted to the engine control unit 10. As a result, even if it is possible to register a new mechanical key 1 by continuously using two regular mechanical keys 1 and performing a predetermined operation, another person illegally uses the new mechanical key 1. You cannot register. Therefore, a smart keyless entry system can be easily added with almost no change in the configuration of the engine control unit 10 in the conventional immobilizer system, and 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 illustrating a vehicle antitheft device according to an embodiment of the present invention. It is a flowchart which shows the control procedure when the key identification code in a smart keyless entry control unit or a portable device identification code is received.

Explanation of symbols

1 Mechanical Key 1a Key Identification Code Transmitter (Key Identification Code Transmitting Means)
2 portable device 2a portable device identification code transmitter (portable device identification code transmitting means)
2b Housing 5 Smart keyless entry control unit (control means)
10 Engine control unit 13 Engine start detection means

Claims (6)

When the mechanical key inserted into the ignition key cylinder of the vehicle is an authorized mechanical key of the vehicle, or the portable device for locking and unlocking the door of the vehicle carried by the vehicle occupant is an authorized portable device of the vehicle A vehicle anti-theft device capable of starting the vehicle engine,
Key identification code transmitting means provided on the mechanical key for transmitting a key identification code;
A portable device identification code transmitting means for transmitting the portable device identification code provided in the portable device;
When the key identification code transmitted from the key identification code transmitting means of the mechanical key inserted into the ignition key cylinder is received, it is determined whether or not the mechanical key is authentic based on the key identification code. When the portable device identification code transmitted from the portable device identification code transmitting means of the portable device is received, it is determined whether or not the portable device is genuine based on the portable device identification code, and A plurality of regular mechanical keys having different key identification codes that are set for the vehicle and transmitted from the key identification code transmitting means at the time of regular determination, which is a determination that the mechanical key or the portable device is genuine. The same key identification code as any one of the mechanical keys is used to control the engine of the vehicle. And control means for transmitting to the unit,
At the time of normal determination of the portable device, the control means transmits the same key identification code as the mechanical key that has been normally determined most recently to the engine control unit, and at the time of normal determination of the mechanical key following the normal determination of the portable device, The key identification code transmitted to the engine control unit at the time of normal determination of the portable device immediately before the normal determination of the mechanical key is transmitted to the engine control unit. If the received key identification code is the same continuously from the time of the normal determination of the first mechanical key at the time of the normal determination of the second and subsequent mechanical keys at the time of determination, the normality of the first mechanical key is determined. The key identification code sent to the engine control unit at the time of regular judgment of the portable device immediately before judgment is Is configured to transmit to the control unit,
The engine control unit is configured to bring the engine of the vehicle into a startable state when a mechanical key or a key identification code transmitted at the time of normal determination of the portable device is received from the control means. A vehicle antitheft device. The vehicle antitheft device according to claim 1,
An anti-theft device for a vehicle, wherein the same key identification code as a regular mechanical key is registered in each of the control means and the engine control unit. The vehicle antitheft device according to claim 2,
When the control means receives the key identification code, the mechanical key is authorized depending on whether or not the key identification code matches one of a plurality of key identification codes registered in the control means. In addition to determining whether or not there is a mechanical key or portable device during normal determination, one of a plurality of key identification codes registered in the control means is transmitted to the engine control unit,
The engine control unit receives the key identification code transmitted from the control means, and when the key identification code matches one of a plurality of key identification codes registered in the engine control unit, An anti-theft device for a vehicle, wherein the vehicle engine is configured to be in a startable state. In the vehicle antitheft device according to any one of claims 1 to 3,
The control means is configured such that the received key identification code is the previous mechanical key at the second and subsequent mechanical key normal determinations when the mechanical key normal determination is performed twice or more consecutively following the normal determination of the portable device. The vehicle is configured to transmit the same key identification code as that of the mechanical key determined to be normal to the engine control unit at the time of normal determination of the mechanical key when it is different from the time of normal determination for the first time. Anti-theft device. In the vehicle antitheft device according to any one of claims 1 to 3,
Engine start detection means for detecting that the engine has started,
The control means is configured such that the received key identification code is the first mechanical key at the second and subsequent mechanical key normal determinations when the mechanical key normal determination is performed continuously twice or more following the normal determination of the portable device. If the engine start detection means detects that the engine has been started after the first mechanical key normal determination, even if the key is continuously the same from the time of normal determination, An anti-theft device for a vehicle, characterized in that, when the mechanical key is properly determined, the same key identification code as that of the mechanical key determined to be normally transmitted is transmitted to the engine control unit. In the antitheft device for a vehicle according to any one of claims 1 to 5,
An anti-theft device for a vehicle, wherein the mechanical key is configured to be stored in a housing portion formed in the portable device.

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