WO2013094417A1

WO2013094417A1 - Vehicle security device

Info

Publication number: WO2013094417A1
Application number: PCT/JP2012/081546
Authority: WO
Inventors: 齋藤　誠; 博之田村; 弘幸白井; 高橋　寿; 賢太石澤
Original assignee: 日本精機株式会社
Priority date: 2011-12-23
Filing date: 2012-12-05
Publication date: 2013-06-27
Also published as: JP2013132912A

Abstract

Provided is a vehicle security device capable of saving costs by using the same components in both transmitting and receiving circuits. The vehicle security device comprises an automotive radio (B) which performs authentication processing as to whether a portable radio (A) is suitable for a vehicle through wireless communication with the portable radio (A). The automotive radio (B) comprises: a signal transmitting unit (4) which sends a request signal through wireless communication using a long wave band frequency based on a vehicle operation signal; a signal receiving unit (5) which receives an identification signal generated by the portable radio (A) through the wireless communication using the long wave band frequency in response to the request signal; a storage unit (6) which stores identification information corresponding to the vehicle; and an authentication unit (7) which determines whether the identification signal and the identification information are suitable or not.

Description

Vehicle security device

The present invention relates to a vehicle security device that determines an authentication code by wireless communication with a portable device.

2. Description of the Related Art In recent years, it has been known that an in-vehicle device such as a door locking / unlocking of a vehicle can be controlled by wireless communication between a portable wireless device possessed by a vehicle driver and an in-vehicle wireless device mounted on the vehicle. Yes.
Patent Document 1 enables control of a vehicle-mounted device when wireless communication between a portable wireless device and a vehicle-mounted wireless device matches an identification code held by each wireless device. It is disclosed that an identification code is transmitted from a portable wireless device as a signal of an ultra high frequency (hereinafter referred to as UHF) band in response to a transmission request signal to the wireless device. At this time, the transmission request signal from the in-vehicle wireless device is a long frequency (hereinafter referred to as LF) band when the portable wireless device is in the vicinity of the vehicle, and a UHF signal when the portable wireless device is in a remote location. Sending using.

In addition, when controlling a vehicle-mounted device, communication in only a short distance is assumed in addition to the case assumed in Patent Document 1. In general, an immobilizer is known as a device for controlling a vehicle-mounted device by short-range communication. This is a device for authenticating a vehicle by communicating between the key and the cylinder using the LF band frequency when a mechanical key is inserted into the key cylinder in order to start the engine. Since the key is inserted into the cylinder, the communication distance is limited to a very close distance (several centimeters).

JP 2010-138623 A

In the above device, the frequency band used for wireless communication between the portable wireless device and the vehicle-mounted wireless device is switched between transmission / reception by LF and UHF or transmission / reception by UHF according to the separation distance between the portable wireless device and the vehicle. Yes. Therefore, since communication using different frequency bands is included, it is necessary to prepare a communication circuit suitable for each frequency band, and there is a problem of increasing costs.

Moreover, it is conceivable that using UHF enables communication over a long distance while increasing the possibility of being intercepted from the outside. In addition, because of the high frequency band, there is a problem that the current consumption of the power source (battery) of the portable wireless device increases during standby and the life of the power source is shortened.

Furthermore, an immobilizer that needs to have a mechanical key inserts the key into the cylinder every time the engine is started. It can be thought that the user feels bothersome.

Accordingly, an object of the present invention has been made in view of the above-described problems. By using the same frequency band, parts used for transmission and reception circuits can be shared, so that the cost can be reduced. It becomes a security device. In addition, the use of the LF band as the operating frequency band reduces the possibility of eavesdropping because the communication distance is shortened compared to the case of using the UHF band, and it is excellent in secrecy and suppresses current consumption during standby. Can do.

The vehicle security device of the present invention is a vehicle security device including an in-vehicle wireless device that performs authentication processing to determine whether or not the vehicle and the portable wireless device are compatible by wireless communication with the portable wireless device. The radio device uses signal transmission means for issuing a request signal by radio communication using a long wave band frequency based on the operation signal of the vehicle, and uses the long wave band frequency from the portable radio device according to the request signal. A signal receiving means for receiving an identification signal generated by the wireless communication, a storage means for storing the identification information corresponding to the vehicle, and an authentication means for determining whether or not the identification signal and the identification information match. And is provided.

Further, the in-vehicle wireless device is characterized in that the request signal from the signal transmission unit and the identification signal from the signal reception unit use different modulation schemes.

The in-vehicle wireless device includes a control unit that issues to the in-vehicle device either a permission / prohibition signal in the control of the in-vehicle device based on a determination result of the authentication unit, and the control unit includes the identification signal. When it is determined that the in-vehicle device is not operating for a predetermined time based on the vehicle information from the vehicle, the prohibition signal is issued to the in-vehicle device. And

The on-vehicle wireless device is built in a vehicle display device mounted on the vehicle, and the vehicle display device and the on-vehicle device communicate with each other via a harness.

The present invention relates to a vehicle security device that determines an authentication code by wireless communication with a portable device, and by using the same frequency band, parts used for transmission and reception circuits can be shared, thereby reducing costs. Is possible.

The block diagram regarding the security apparatus in embodiment of this invention. The flowchart which shows the process sequence in embodiment same as the above.

Hereinafter, embodiments of a vehicle security device according to the present invention will be described with reference to the drawings, taking as an example a device applied to a motorcycle instrument device (vehicle display device).

FIG. 1 shows a configuration related to a security system of an instrument device, in which a portable radio A and an in-vehicle radio B perform radio communication.

The portable wireless device A includes a storage unit 1 that stores an identification code corresponding to a vehicle (vehicle-mounted wireless device), and a wireless communication unit 2 that includes an antenna and a transmission / reception circuit for performing wireless communication using a long wave band frequency. And a control means 3 for controlling the wireless communication means 2 so as to emit an identification signal including the identification code based on a request signal from a vehicle-mounted radio B to be described later received using the wireless communication means 2, and these A storage battery (not shown) serving as a power source for operating the means is provided.

The in-vehicle wireless device B includes a signal transmission unit 4, a signal reception unit 5, a storage unit 6, an authentication unit 7, a control unit 8, and a display 9, each of which is electrically connected to a circuit board (not shown). And is housed in a housing of a vehicle instrument.

The signal transmission means 4 can be applied with an antenna or a transmission circuit for emitting a request signal by wireless communication using a frequency in a long wave band based on an input of an operation signal according to an operation of a vehicle user such as an in-vehicle switch. In this case, the signal transmission means 4 emits a request signal under the control of the control means 8, and the operation signal is input as one of the vehicle information. In this case, the in-vehicle switch is provided separately from the instrument device, but can also be provided as a switch in the instrument device. For example, it can also be used as another function switch such as a dimming switch or a screen switch. , Component parts can be reduced.

The signal receiving means 5 can be applied with an antenna or a receiving circuit for receiving an identification signal from the portable wireless device A, and is configured to be able to perform wireless communication using a long-wave band frequency like the signal transmitting means 4. ing. The signal transmitting means 4 and the signal receiving means 5 can be configured at low cost without providing a dedicated circuit board or power supply circuit by being mounted on the circuit board of the instrument device.

In addition, wireless communication is performed with a portable wireless device A that is assumed to be carried by a user of the vehicle (two-wheeled vehicle) at a location with relatively few obstacles and at a short distance (within 1 meter). Therefore, authentication processing by highly reliable wireless communication is possible. Moreover, the antenna of the signal receiving means 5 and the signal transmitting means 4 can be shared (so-called transceiver), and the number of components can be reduced.

Further, confidentiality can be improved by performing communication using a different modulation method (for example, amplitude shift keying and frequency shift keying) between the request signal generated by the signal transmitting unit 4 and the identification signal received by the signal unit 5. Can be increased.

The storage means 6 can be a non-volatile storage medium such as an EEPROM or a flash ROM connected to the control means 8 and the authentication means 7, and the display 9 is displayed based on the identification information corresponding to the vehicle and the input vehicle information. Information necessary for each control, such as a control program, is stored.

The authentication means 7 can apply a microcomputer and determines whether or not the identification signal from the portable wireless device A and the identification information stored in the storage means 6 are compatible (authenticated). Judgment is made based on the program, and determination result of either conformity / non-conformity is determined.

As the control means 8, a microcomputer including the authentication means 7 can be applied, and vehicle information based on signals from various sensors and switches of the vehicle is input, and the vehicle information and various programs stored in the storage means 6 are used. The display 9 displays desired vehicle information, for example, measured values such as the traveling speed of the vehicle, the cruising distance, the accumulated traveling distance, operating indicators such as headlamps, direction indicators, and gear positions, and various alarms. A control signal for display can be generated and output to the display.

Further, based on the determination result of the authentication means 7, the control means 8 issues a signal prompting permission / prohibition in the control of the in-vehicle device C to the in-vehicle device C connected by the harness. In this case, the in-vehicle device C is composed of an engine starter control unit, which enables the engine starter based on a permission signal from the control means 8, and when a prohibition signal is issued from the control means 8, the engine is started. The starter can be switched so that it cannot operate.

The indicator 9 displays a plurality of vehicle information, and is composed of a liquid crystal display panel, a display lamp, a so-called pointer instrument provided with a rotating pointer and an indicator portion indicated by the pointer, a warning light, and the like. Based on the control signal from the means 8, the vehicle user is notified of the vehicle state. In this case, the display device 9 can also display an authentication result by an authentication process described later.

With the above configuration, authentication processing between the portable radio A and the in-vehicle radio B can be performed. Hereinafter, a processing procedure by the microcomputer constituting the control unit 8 and the authentication unit 7 will be described.

The control means 8 issues a request signal using a long-band frequency to the periphery of the instrument device based on the input of the operation signal (step S1). In this case, the signal transmission unit 4 transmits a request signal obtained by modulation (for example, amplitude shift keying). Further, when the portable radio device A receives this request signal, the portable radio device A transmits an identification signal including the identification code stored in the storage means of the portable radio device A as described above. Note that the wireless communication unit 2 of the portable wireless device A transmits the identification signal by modulation (in this case, frequency shift keying) different from the request signal.

The control means 8 determines whether or not the identification signal from the portable wireless device A has been received (step S2). If received, the control means 8 transmits a request signal for a predetermined time after the last transmission. It is determined whether or not an identification signal has been received (for example, for 1 second) (step S3). By this determination, useless authentication processing can be prevented from being performed. It should be noted that the starting point for timing may start not from the time for transmitting the request signal but from the time for receiving the operation signal.

Next, the authenticating means 7 collates the received identification signal with the identification information stored in the storage means 6, and performs an authentication process for determining whether or not the identification signal is suitable for the vehicle (step S4). ). In this determination, when the identification signal matches the identification information stored in the storage unit 6, the control unit 8 transmits a permission signal that prompts the control of the in-vehicle device C to be permitted (step S5). At this time, the control means 8 can notify the vehicle user by controlling the display 9 so as to indicate that it has been authenticated or that the in-vehicle device C is operable.

In addition, when each condition is not satisfy | filled by the above-mentioned process (especially step S3, S4), it will be in the state where the prohibition signal was transmitted to the vehicle equipment C (step S6). At this time, the control means 8 outputs a control signal for prompting the display 9 to indicate that the authentication has not been performed for a certain period of time (for example, 10 seconds).

Further, even when the permission signal is transmitted in step S5, the control means 8 determines whether or not the in-vehicle device C is operated within a predetermined time (for example, 60 seconds) from the transmission of the permission signal. If it is determined based on the vehicle information and the in-vehicle device C is not operating, a time-counting process (step S7) is performed so as not to continue an unnecessary permission state by transmitting a prohibition signal to the in-vehicle device C. .

With the above processing, even with a simple configuration using the vehicle-mounted radio B stored in the instrument device, highly confidential authentication processing can be performed.

In an instrument device including such a vehicle security device, a vehicle including an in-vehicle wireless device B that authenticates whether the vehicle and the portable wireless device A are compatible by wireless communication with the portable wireless device A. The in-vehicle wireless device B, which is a security device, includes a signal transmission unit 4 that issues a request signal by wireless communication using a long wave band frequency based on an operation signal of the vehicle, and a portable wireless device that responds to the request signal. A signal receiving means 5 for receiving an identification signal emitted from the machine A by radio communication using a long-wave band frequency, a storage means 6 for storing identification information corresponding to the vehicle, the identification signal and the identification information; And authentication means 7 for determining whether or not the above is compatible.

Therefore, the parts using the same frequency band can share the parts used for the transmission and reception circuits, so that the number of parts can be reduced and the cost can be reduced. For example, the antenna, the antenna and the signal transmitting means 4, or the matching element for matching the antenna and the signal receiving means 5, various electronic parts for supplying power to the transmission / reception IC, and these wiring patterns can be shared. The overall configuration can be simplified. In addition, the use of the long wave band as the operating frequency band reduces the possibility of eavesdropping because the communication distance is shortened compared to the case of using the ultra high frequency band, providing superior confidentiality and reducing current consumption during standby. be able to.

In addition, since the in-vehicle wireless device B uses a modulation scheme in which the request signal from the signal transmission unit 4 and the identification signal from the signal reception unit 5 are different, the confidentiality can be improved.

Further, the in-vehicle wireless device B includes a control unit 8 that issues any of the permission / prohibition signals in the control of the in-vehicle device C to the in-vehicle device C based on the determination result of the authentication unit 7. By issuing the prohibition signal to the in-vehicle device C when it is determined that the in-vehicle device is not operating for a predetermined time based on the vehicle information from the vehicle even though the identification signal is matched with the identification information. Unnecessary permission states that the user does not recognize can be suppressed.

The in-vehicle wireless device B is built in an instrument device mounted on the vehicle, and the instrument device and the in-vehicle device C communicate with each other via a harness, thereby performing highly reliable wireless communication. be able to. In particular, a motorcycle instrument device is effective because it is an electrical component close to the driver and at a relatively high position, and is less affected by obstacles and other devices. In addition, an inexpensive system that can control the in-vehicle device C without inserting a mechanical key can be achieved.

Although the vehicle security device of the present invention has been described by way of example in the configuration of the above-described embodiment, the present invention is not limited to this, and other configurations depart from the gist of the present invention. It goes without saying that various improvements and display changes can be made without departing from the scope. For example, by transmitting a request signal including an identification code from the in-vehicle wireless device B, and the portable wireless device A is configured to transmit the identification signal only when the identification code is received, the portable device The wireless system A and the in-vehicle wireless system B can be mutually authenticated.

Moreover, although it comprised so that it might alert | report using the indicator 9 according to an authentication result, when not authenticating, the information including what was not authenticated in step S2 to S4 may also be alert | reported. it can. In addition, the contents to be notified can be notified of a communication state such as one of reception and transmission, or both, and an authentication result regardless of whether it is a portable wireless device or a vehicle-mounted wireless device. In addition to the above contents, it is also possible to notify that there is a decrease in the remaining power of each wireless device, or that the in-vehicle device is being controlled after authentication. *

Further, in the notification indicating the authentication result, not only the display by the display 9 but also the light emission by the illumination such as LED, buzzer sound, voice, vibration, etc. can be effectively transmitted to the user. In the embodiment of the present invention, the in-vehicle wireless device is the starting point of the operation. However, the portable wireless device can be the starting point of the operation.

The present invention can be applied to a vehicle security device that is mounted on a vehicle and displays various types of vehicle information, for example, as a security device that is mounted on a mobile body including a car, a motorcycle, an agricultural machine, or a construction machine.

4 Signal transmission means
5 Signal receiving means
6 Memory means
7 Authentication means
8 Control means
9 Display
A Portable radio
B Car radio
C In-vehicle equipment

Claims

A vehicle security device including an in-vehicle wireless device that performs authentication processing as to whether or not the vehicle and the portable wireless device are compatible by wireless communication with the portable wireless device,
The in-vehicle wireless device includes a signal transmission unit that issues a request signal by wireless communication using a long wave band frequency based on the operation signal of the vehicle;
A signal receiving means for receiving an identification signal generated by wireless communication using a frequency of a long wave band from the portable wireless device in response to the request signal;
Storage means for storing identification information corresponding to the vehicle;
Authentication means for determining whether the identification signal and the identification information match;
A vehicle security device characterized by comprising:
2. The vehicle security device according to claim 1, wherein the in-vehicle wireless device uses a modulation method in which a request signal from the signal transmission unit and an identification signal from the signal reception unit are different.
The in-vehicle wireless device includes a control unit that issues any of the permission / prohibition signals in the control of the in-vehicle device to the in-vehicle device based on the determination result of the authentication unit,
When the control means determines that the in-vehicle device has not been operated for a predetermined time based on the vehicle information from the vehicle even though the identification signal is matched with the identification information, the control signal outputs the prohibition signal. The vehicle security device according to claim 1, wherein the vehicle security device is issued to the in-vehicle device.
The in-vehicle wireless device is built in a vehicle display device mounted on the vehicle,
The vehicle security device according to any one of claims 1 to 3, wherein the vehicle display device and the in-vehicle device communicate via a harness.