JP2005008018A - Security device, and keyless entry device and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a security device capable of rightly detecting a suspicious person even in an environment where an interference of radio waves is generated. <P>SOLUTION: This security device 3A for a vehicle A is provided with a decision means for deciding whether or not a user is a regular user of the vehicle A based on transmission data including identification information transmitted from a radio card key 2 and a detection means for detecting that the suspicious person approaches when it is decided that the user is not the regular user of the vehicle A by the decision means. When it is decided that the user is not the regular user of the vehicle A by the decision means, whether or not the transmission data is transmitted from a regular user of a vehicle B is decided based on information on the regular user of the vehicle B acquired from the vehicle B by using an inter-vehicle communication device 30A. When the transmission data are transmitted from the regular user of the vehicle B as the result of the decision, detection information on the approaching of the suspicious person is made invalid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security device, a keyless entry device, and a system.
[0002]
[Prior art]
Conventionally, vehicle security devices have been proposed. This security device is for preventing the vehicle itself and the in-vehicle device (article) from being stolen when the vehicle is not used. When the security device is set to the security mode, the third party When the door of the car is opened, the trunk of the car is opened, or a large impact is applied to the car, for example, an alarm means such as generating a siren sound or blinking the headlight is operated, and the engine is driven, for example. The vehicle start prevention means such as stopping is operated.
[0003]
The following are proposed as such conventional techniques. The security device described in Patent Document 1 includes a transmission unit and a security reception unit. When transmission data composed of an ID code including a fixed code and a variable code and a command code is transmitted from the transmission unit, Only when the fixed code and the variable code are predetermined, the security receiving unit responds to the transmission data.
[0004]
In addition to the security device described above, the following prior art has been proposed for a keyless entry device. The keyless entry device described in Patent Document 2 is provided with door lock control means for locking / unlocking the door to the door lock means in response to a signal sent from the transmitter to the receiver.
[0005]
In recent years, it has been proposed to use a non-contact type IC card using an LF band (long wave band) as a key used in a security device or a keyless entry device.
[0006]
[Patent Document 1]
JP-A-8-56387
[Patent Document 2]
JP-A-4-244456
[Problems to be solved by the invention]
However, when a non-contact type IC card is used as a key used in the security device described in Patent Document 1 or the keyless entry device described in Patent Document 2, in a place where a vehicle is adjacent, such as a parking lot, Since the communication ranges of the non-contact type IC card overlap, there is a problem that radio wave interference occurs.
[0007]
Accordingly, the present invention has been made to solve these problems, and provides a security device, a keyless entry device, and a system capable of correctly detecting a suspicious person even in an environment where radio wave interference occurs. For the purpose.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a security device according to the present invention includes a determination unit that determines whether or not the vehicle is an authorized user based on transmission data that includes identification information transmitted from a transmitter, and the determination unit determines whether the vehicle is an authorized user. Obtained from surrounding vehicles when the determination means determines that the user is not a regular user of the vehicle. Based on the information related to the authorized user of the surrounding vehicle, it is determined whether the transmission data is transmitted from the authorized user of the surrounding vehicle, and as a result of the determination, the transmitted data is transmitted from the authorized user of the surrounding vehicle. In some cases, there is provided invalid means for invalidating detection by the detection means.
[0009]
According to the present invention, even when the communication range interferes with the surrounding vehicle, the insufficient information portion is acquired from the surrounding vehicle, so that correct suspicious person detection can be performed. Thereby, for example, a safe parking environment can be provided.
[0010]
Further, the present invention is characterized in that, in the security device, the invalid means obtains information on an authorized user of the surrounding vehicle via a vehicle-to-vehicle communication device that performs vehicle-to-vehicle communication. According to the present invention, since information related to authorized users of surrounding vehicles is acquired via the inter-vehicle communication device, the inter-vehicle communication device can be effectively used.
[0011]
Further, the present invention is characterized in that the security device further comprises alarm means for issuing an alarm when the detection means detects that a suspicious person has approached. According to the present invention, it is possible to notify that the suspicious person has approached by the warning means.
[0012]
The keyless entry device of the present invention is a keyless entry device comprising a security device and door lock means for locking / unlocking a door, wherein the security device uses the security device. To do. ADVANTAGE OF THE INVENTION According to this invention, the keyless entry apparatus which can detect a suspicious person correctly can be provided.
[0013]
The system of the present invention is a system comprising a transmitter and a keyless entry device, wherein the keyless entry device uses the keyless entry device. ADVANTAGE OF THE INVENTION According to this invention, the system which can detect a suspicious person correctly can be provided.
[0014]
The present invention is also characterized in that, in the above system, the transmitter is a non-contact IC card. According to the present invention, it is possible to correctly detect a suspicious person even when a communication range interferes with a surrounding vehicle by a non-contact IC card.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram for explaining an overview of a system according to the present embodiment. The system according to the present embodiment uses the inter-vehicle communication (PSS) device 30 to actively use the interference of the wireless card key 2 to effectively use the inter-vehicle communication device 30 during parking.
[0016]
FIG. 1 is a diagram illustrating a state in which two vehicles A and B equipped with a security device are parked side by side. In FIG. 1, 2 is a wireless card key, A and B are vehicles, 3A is a security device mounted on the vehicle A, 3B is a security device mounted on the vehicle B, and 30A is an inter-vehicle communication device mounted on the vehicle A. , 30B denotes an inter-vehicle communication device mounted on the vehicle B, S1 denotes a communication range of the vehicle A, S2 denotes a communication range of the vehicle B, and S3 denotes a range where radio waves of the vehicles A and B interfere.
[0017]
As shown in FIG. 1, when a vehicle A and a vehicle B equipped with inter-vehicle communication devices 30A and 30B are parked side by side, a user of the vehicle B having the wireless card key 2 (owned by the vehicle B) When approaching B, since the communication range of the wireless card key 2 interferes between the vehicle A and the vehicle B, the information of the wireless card key 2 can be read even by the vehicle A parked next.
[0018]
In this case, the vehicle A is required to determine whether or not the wireless card key 2 is the own user or a suspicious person. However, when viewed from the vehicle A, since there is no information on the wireless card key 2 of the vehicle B, all other than the own user are suspicious. In the system according to the present embodiment, the shortage information part can be complemented with each other using the inter-vehicle communication devices 30A and 30B, so that a suspicious person can be detected and a safe parking environment can be provided. .
[0019]
Next, a specific configuration of the system according to the present embodiment will be described. FIG. 2 is a configuration diagram of a system according to the present embodiment. In FIG. 2, reference numeral 1 denotes a system, 2 non-related card keys, 3A denotes a security device mounted on the vehicle A, 10 denotes a keyless entry device, and 30A denotes an inter-vehicle communication device mounted on the vehicle A. Note that the security device 3B and the vehicle-to-vehicle communication device 30B mounted on the vehicle B have the same configuration as the security device 3A and the vehicle-to-vehicle communication device 30A mounted on the vehicle A, and thus description thereof is omitted.
[0020]
As shown in FIG. 2, the wireless card key 2 includes a control unit 2a, a coil antenna 2b, an activation detection unit 2c, a power supply unit 2d, a storage unit 2e, and a transmission circuit 2f. The keyless entry device 10 includes a door latch portion 9 in addition to the security device 3A.
[0021]
The security device 3A includes an activation signal generation unit 4, a control unit 5, a receiving circuit 6, an alarm unit 7, and an engine stop unit 8. The activation signal generation unit 4 includes a coil antenna 4a and an activation generation circuit unit 4b. The control unit 5 includes a control unit 5a, a door lock relay 5b, a door lock detection SW 5c, and a door switch 5d. The receiving circuit 6 demodulates the carrier signal from the wireless card key 2 received by the receiving antenna and reproduces the transmission data.
[0022]
The alarm means 7 is configured to issue an alarm when it is detected by the control unit 5a that a suspicious person has approached. For example, the alarm means 7 is configured by a speaker or a headlight. When the control unit 5a detects a suspicious person, the alarm unit 7 The means 7 is driven to generate a siren sound from the speaker, blink the headlight, and the like. The engine stop means 8 stops the drive of the engine. The door latch portion 9 includes a door lock motor 9a and a door lock link SW9b.
[0023]
The wireless card key 2 is usually possessed by the owner who is away from the vehicle when the vehicle is not in use. When the activation signal is received from the activation signal generator 4, the transmission data including the ID code and the command code is secured. Output to device 3. In the present embodiment, a contactless IC card is used as the wireless card key 2. The detailed configuration of the wireless card key 2 is as follows.
[0024]
The coil antenna 2 b receives the activation signal transmitted from the coil antenna 4 a of the activation signal generator 4. The activation detector 2c sends the activation signal received by the coil antenna 2b to the controller 2a. The power supply unit 2d supplies power to the control unit 2a. The storage unit 2e stores a predetermined ID code and command code. When the activation signal from the security device 3A is a normal activation signal, the control unit 2a receives supply of current from the power supply unit 2d, and sends the ID code and command code stored in the storage unit 2e to the transmission circuit 2f. Output.
[0025]
The transmission circuit 2f modulates the transmission data including the ID code and the command code from the control unit 2a into a carrier frequency signal, converts the data into a carrier wave signal, amplifies the power to an appropriate transmission level, Transmit to the security device 3A. Note that the control unit 2a is activated for several seconds, during which the power supply unit 2d is connected and transmission data including an ID code and the like is transmitted. If the next activation signal is received during this period, the ID code is continuously transmitted. If the activation signal is not received from the security device 3A for several seconds or longer, transmission of transmission data including the ID code and the like is stopped.
[0026]
The security device 3A is normally mounted on the vehicle side at all times, responds only when the unique ID (identification) code included in the transmission data transmitted from the wireless card key 2 matches, and the transmission data The security mode is set, the security mode is canceled, etc., according to the command code included in. Since the security device 3A does not respond to data other than transmission data including a unique ID code, the security device 3A is useful for the theft of an automobile or an in-vehicle device (article).
[0027]
The activation signal generator 4 is attached to a predetermined location of the automobile and transmits an activation signal by electromagnetic dielectric for activating the wireless card key 2 based on a signal from the controller 5. In response to an instruction from the control unit 5, the activation signal generation unit 4 operates the activation generation circuit unit 4 b to transmit an activation signal by electromagnetic dielectric to the card key 2 from the coil antenna 4 a. The transmission distance of this activation signal is several meters, and the wireless card key 2 is activated when the wireless card key 2 approaches within several meters.
[0028]
The control unit 5 controls each member of the security device 3, and outputs a command for causing the activation generation circuit unit 4 b to transmit an activation signal to the activation signal generation unit 4.
[0029]
When the control unit 5a receives the reproduction transmission data from the receiving circuit 6, the control unit 5a collates the ID code included in the transmission data, detects that the suspicious person has approached, and if the ID code matches as a result of the collation. The alarm unit 7, the engine stop unit 8, the door latch unit 9, and the inter-vehicle communication device 30A are operated according to the command code included in the transmission data. In addition, the control part 5a is equivalent to a detection means.
[0030]
Further, when the IDs do not match as a result of the collation, that is, when it is determined that the vehicle is not a regular user of the vehicle, the control unit 5a transmits the transmission data based on the information about the regular user of the surrounding vehicle acquired from the surrounding vehicle. It is determined whether or not the information is transmitted from an authorized user of the surrounding vehicle. If the result of the determination is that the information is transmitted from an authorized user of the surrounding vehicle, the suspicious person detection once detected is invalidated. The control unit 5a corresponds to invalid means.
[0031]
Here, the control part 5a acquires the information regarding the regular user of a surrounding vehicle via the vehicle-to-vehicle communication apparatus 30A which performs vehicle-to-vehicle communication.
[0032]
The control unit 5a receives the transmission data including the regular ID code from the wireless card key 2, and unlocks the door to the door lock relay 5b when the transmission data includes a door lock release command. A drive signal is output. In addition, when it is impossible to receive the regular ID code from the wireless card key 2 when the door locking device is unlocked, a drive signal for locking the door is sent to the door lock relay 5b, and the door lock motor 9a is turned on. Drive.
[0033]
When the door is locked or unlocked according to the transmission data, the controller 5a may blink a hazard lamp to inform the driver whether the door is locked or unlocked. When the door lock detection SW 5c receives a signal indicating whether the door is in a locked state or an unlocked state from the door latch unit 9, the door lock detection SW 5c outputs the signal to the control unit 5a.
[0034]
The door latch part 9 drives or locks the lock device (not shown) in the door latch part 9 by driving the door lock motor 9a according to the direction of the current from the door lock relay 5b of the control part 5. . The door lock link SW9b outputs a signal indicating whether the lock device is locked or unlocked to the door lock detection switch 5c.
[0035]
In addition, the control unit 5a detects an abnormality by, for example, prying the automobile door by a third party when the reproduction transmission data is not supplied, or detects an abnormality by applying a large impact to the automobile. Or, when an abnormality is detected by, for example, opening a car trunk by a third party, the alarm means 7 is driven in response to the detection, and the headlight of the car is blinked, and / or A siren sound is generated or the engine stop means 8 is driven to stop the engine drive. For this reason, when the automobile is not used at night or the like, it is possible to prevent the third person from stealing the automobile and the articles mounted on the automobile.
[0036]
Next, the vehicle-to-vehicle communication device according to the present embodiment will be described. FIG. 3 is a block diagram of the inter-vehicle communication apparatus according to the present embodiment. As illustrated in FIG. 3, the inter-vehicle communication device 30 </ b> A includes an inter-vehicle transmission / reception unit 31 and an inter-vehicle communication control unit 32. The inter-vehicle transmission / reception unit 31 includes a reception unit 311 and a transmission unit 312.
[0037]
This inter-vehicle communication device 30A is connected to the control unit 5a of the security device 3A as described above. When the control unit 5a of the security device 3A determines that the ID code from the wireless card key 2 is not that of the authorized user of the vehicle, the inter-vehicle communication device 30A obtains information on the authorized user of the surrounding vehicle from the surrounding vehicle. Used to obtain. When an ID code other than the ID code of a legitimate user is received due to interference between the surrounding vehicle and the communication range, an insufficient information portion is acquired from the surrounding vehicle and accurate suspicious person detection is performed.
[0038]
The inter-vehicle communication control unit 32 includes a received message analysis unit 321, a virtual network configuration unit 322, a virtual network holding unit 323, an automatic situation determination back end unit 44, a message creation unit 324, a resource database 33, a position detection unit 325, and an input unit. 328 and a detection sensor 329 are provided. The automatic situation determination back-end unit 44 includes an environment / situation monitoring unit 441, a request input unit 442, a virtual network selection unit 443, and a communication destination determination message creation unit 444.
[0039]
The reception message analysis unit 321 analyzes the reception message from the reception unit 311, and inputs the message to the virtual network configuration unit 322 if the message is ID information, resource content, own vehicle position information, or the like of the communication destination vehicle. The virtual network configuration unit 322 obtains a virtual logical network to which the communication destination vehicle belongs by referring to the received information, registers the communication destination vehicle as a member of the virtual logical network in the member table of the virtual network table holding unit 323, and simultaneously The resource related to the network owned by the communication destination vehicle is registered in the resource table RSTi.
[0040]
The inter-vehicle communication control unit 32 controls the message creating unit 324 to transmit the information when transmitting its own ID information, resource contents, etc. to other vehicles. The message creation unit 324 creates ID information, resource contents, and the like using various information in the resource database 33 and the own vehicle position information detected by the position detection unit 325, and transmits the ID information, resource contents, etc. to the other vehicle via the transmission unit 312. To do.
[0041]
In addition, in a state where several virtual logical networks are configured, the environmental status monitoring unit 441 of the automatic status determination back-end unit 44 monitors the environment and status of the driver and the vehicle, and the monitoring result is displayed as a virtual network selection unit 443. Output to. The request input unit 442 outputs the driver request to the virtual network selection unit 443.
[0042]
The virtual network selection unit 443 selects an optimal virtual logical network from a plurality of virtual logical networks in accordance with the environment / situation of both, changes in the driver's emotion / physical condition, and the driver's request. The communication destination determination / message creation unit 444 creates a transmission message for requesting or notifying the selected virtual logical network as a production network, and requesting or notifying necessary information, and sends the created message to the production network. It transmits toward the predetermined moving body which comprises.
[0043]
An operation when acquiring information about authorized users of surrounding vehicles will be described. The inter-vehicle communication control unit 32 transmits its own ID information, resource content, etc. to another vehicle when receiving a command for acquiring information related to the authorized user of the surrounding vehicle from the control unit 5a of the security device 3A. Therefore, the message creation unit 324 is controlled to transmit these pieces of information.
[0044]
The message creation unit 324 creates ID information, resource content, and the like using various information in the resource database 33 and the vehicle position information detected by the position detection unit 325, and the surrounding vehicle (vehicle B) via the transmission unit 312. ). Note that the inter-vehicle communication device 30 </ b> A transmits a message only to the surrounding vehicles of the host vehicle because the transmission is performed during parking.
[0045]
In addition, when the reception unit 311 of the vehicle-to-vehicle communication device 30A acquires information about the authorized user of the vehicle B from the vehicle-to-vehicle communication device 30B of the vehicle B, the reception unit 311 It outputs to the control part 5a. Thereby, 3 A of security apparatuses can acquire the information regarding the regular owner of a surrounding vehicle.
[0046]
Next, the operation of the system according to the present embodiment will be described with reference to FIGS. FIG. 4 is an operation flowchart of the system according to the present embodiment. A case where the user of the vehicle B carries the wireless card key 2 and approaches the vehicle B will be described. In step S101, the activation signal generation unit 4 of the security device 3B of the vehicle B transmits an activation signal to the wireless card key 2 of the vehicle B user.
[0047]
In step S102, the coil antenna 2b of the wireless card key 2 receives the activation signal from the security device 3B. The activation detector 2c sends the activation signal received by the coil antenna 2b to the controller 2a.
[0048]
In step S103, if the activation signal received from the security device 3B is a regular activation signal, the controller 2a of the wireless card key 2 reads the ID code from the storage unit 2e and transmits transmission data including the ID code. It is transmitted from the circuit 2f to the security device 3B.
[0049]
In step S <b> 104, the security device 3 </ b> B of the vehicle B receives transmission data from the wireless card key 2 via the reception circuit 6. The control unit 5a of the security device 3B of the vehicle B compares the ID code included in the transmission data with the ID code stored in advance, and responds to various command codes included in the transmission data when both ID codes match. For example, the key of the automobile door is opened or the key of the automobile door is closed.
[0050]
In step S105, if the vehicle A is also within the communication range, the security device 3A of the vehicle A also receives the transmission data from the wireless card key 2. In step S105, when the security device 3A of the vehicle A receives the transmission data from the wireless card key 2 via the receiving circuit 6, the control unit 5a is included in the transmission data from the wireless card key 2 in step S106. The ID code is compared with the ID code stored in advance, and it is verified whether or not it belongs to the authorized user.
[0051]
If it is detected in step S106 that the user is an authorized user, in step S107, door unlocking or the like is performed in accordance with the command code included in the transmission data, and the process is terminated. Since the user is not a regular user of the vehicle A, this process is not performed.
[0052]
In step S106, if the control unit 5a of the security device 3A of the vehicle A detects that the received ID code is not that of the authorized user as a result of collating information from the wireless card key 2, the inter-vehicle communication device 30A Confirmation request information is output. Here, the confirmation request information includes a confirmation request signal, the vehicle position, the received wireless card information, and the like.
[0053]
In step S108, the vehicle-to-vehicle communication device 30A of the vehicle A transmits the confirmation request information sent from the security device 3A to the vehicle-to-vehicle communication device of the surrounding vehicle.
[0054]
In addition, 30 A of inter-vehicle communication apparatuses are transmitted only with respect to the surrounding vehicle by sending own vehicle position information for the transmission in the parking state in which the network is not formed. That is, the inter-vehicle communication device 30A performs non-network type communication (one-to-many communication) because it is communication during parking.
[0055]
In step S109, when the inter-vehicle communication device 30B of the vehicle B receives the confirmation request information from the inter-vehicle communication device 30A of the vehicle A, in step S110, the confirmation sent to the security device 3B mounted on the own vehicle. Outputs request information. In step S110, the security device 3B of the vehicle B collates based on the received confirmation request signal as to whether or not the vehicle is an authorized user.
[0056]
When the wireless card key information included in the confirmation request information is information on the wireless card key registered in the own vehicle, the security device 3B displays the verification result indicating that the vehicle is a registered wireless card key. Output to the inter-vehicle communication device 30A.
[0057]
In step S111, the inter-vehicle communication device 30B of the vehicle B transmits the verification result from the security device 3B to the inter-vehicle communication device 30A of the vehicle A. In step S112, the inter-vehicle communication device 30A of the vehicle A receives the verification result from the vehicle B, and outputs the confirmation result sent to the security device 3A mounted on the host vehicle.
[0058]
In step S113, the control unit 5a of the security device 3A determines whether the transmission data of the wireless card key 2 is an authorized user of the surrounding vehicle based on the collation result, and detects that the data is that of an authorized user of the surrounding vehicle. In this case, it is determined that the card is not a suspicious card, and the process is terminated without performing an alarm or the like by the alarm means 7.
[0059]
In step S113, when the control unit 5a of the security device 3A detects that the transmission data from the wireless card key 2 is not from the authorized user of the surrounding vehicle based on the collation result, the control unit 5a in step S114. The alarm means 7 is operated, for example, after generating a siren sound, blinking the headlight, etc., the process is terminated. In addition, when operating the alarm unit 7, the control unit 5a may operate, for example, an engine stop unit 8 of an automobile that stops driving the engine.
[0060]
According to this embodiment, when it is detected by the control unit 5a that the ID code from the wireless card key 2 is not that of a regular user of the vehicle, information on the regular user of the surrounding vehicle is obtained from the surrounding vehicle, Based on the acquired information, when it is found that the transmission data is transmitted from an authorized user of the surrounding vehicle, the detection of the suspicious person by the detecting means is invalidated. Even when an ID code other than the ID code of the authorized user is received due to interference of the communication range, correct suspicious person detection can be performed. Thereby, for example, a safe parking environment can be provided. Moreover, according to this system, the vehicle-to-vehicle communication device which is not used during parking can be effectively used.
[0061]
The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible. For example, in the present embodiment, information on authorized users of surrounding vehicles is acquired using the inter-vehicle communication device. However, the present invention is not limited to this, and other methods can be used for the surrounding vehicles. You may make it acquire the information regarding a regular user.
[0062]
In this embodiment, a non-contact type IC card key has been described as an example of a transmitter. However, the present invention is not limited to this, and a remote controller or the like conventionally used may be used. Further, in this embodiment, based on the confirmation signal request information, the peripheral vehicle is verified as to whether it is a legitimate user. However, the present invention is not limited to this. Information related to the user may be acquired, and the security device may check whether the user is an authorized user of the surrounding vehicle based on the acquired information related to the authorized user of the surrounding vehicle.
[0063]
Further, in the present embodiment, as shown in FIG. 1, the case where two vehicles are parked has been described as an example, but the present invention is not limited to this, for example, a monthly decision, a company, etc. It can also be applied in a parking lot.
[0064]
【The invention's effect】
As described above, the present invention provides a security device, a keyless entry device, and a system that can correctly detect a suspicious person even in an environment where radio wave interference occurs.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state in which two vehicles A and B equipped with a security device are arranged.
FIG. 2 is a configuration diagram of a system according to the present embodiment.
FIG. 3 is a block diagram of the inter-vehicle communication device according to the present embodiment.
FIG. 4 is an operation flowchart of the system according to the present embodiment.
[Explanation of symbols]
1 system
2 Wireless card key
3A, 3B security device
4 Start signal generator
5 Control part
7 Alarm means
8 Engine stop means
9 Door latch
30A, 30B Inter-vehicle communication device

Claims (6)

Based on transmission data including identification information sent from the transmitter, a determination unit that determines whether or not the vehicle is a regular user, and a suspicious person approaches when the determination unit determines that the vehicle is not a regular user In a security device comprising detection means for detecting
Whether or not the transmission data is transmitted from the authorized user of the surrounding vehicle based on the information about the authorized user of the surrounding vehicle acquired from the surrounding vehicle when the determining means determines that the vehicle is not an authorized user of the vehicle A security device comprising invalid means for invalidating detection by the detection means when the determination result indicates that the information is transmitted from a regular user of a surrounding vehicle. The security device according to claim 1, wherein the invalidating unit obtains information on an authorized user of the surrounding vehicle via a vehicle-to-vehicle communication device that performs vehicle-to-vehicle communication. The security device according to claim 1, further comprising a warning unit that issues a warning when the detection unit detects that a suspicious person has approached. A keyless entry device comprising a security device and a door lock means for locking / unlocking the door,
The keyless entry device according to any one of claims 1 to 3, wherein the security device is the security device according to any one of claims 1 to 3. A system comprising a transmitter and a keyless entry device,
The system according to claim 4, wherein the keyless entry device is the keyless entry device according to claim 4. 6. The system according to claim 5, wherein the transmitter is a contactless IC card.

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