JP4700552B2 - Communication terminal, communication device, and communication system - Google Patents

Description

  The present invention relates to a communication terminal having a clock function, a communication device capable of bidirectional communication with the communication terminal, and a communication system including the communication terminal and the communication device.

  In recent years, there has been proposed an electronic key system that permits an operation of a controlled object by an operation control device when a corresponding communication terminal (electronic key) is used. In Patent Document 1, when the holder of the corresponding electronic key (portable device) enters a predetermined area outside the vehicle, the operation control device (transmission / reception device on the vehicle side) automatically permits the unlocking of the vehicle-mounted door. An electronic key system (vehicle remote control device) is disclosed.

  In this type of electronic key system, in order to monitor the approach of the corresponding electronic key holder to the vehicle, a request signal is transmitted from the operation control device to a predetermined area outside the vehicle while the in-vehicle door is locked. When the request signal is received by the electronic key receiving unit, a signal (ID code signal) including an ID code individually set for each electronic key is generated by the electronic key control unit, and the ID code A signal is transmitted from the transmission unit of the electronic key.

  When the ID code signal is received by the operation control device, the operation control device determines whether or not the ID code included in the ID code signal matches the reference ID code. When the two ID codes match, the operation control device recognizes that the corresponding electronic key has been used and permits the unlocking of the vehicle-mounted door. Then, when the door outside handle is touched in such a state that unlocking of the vehicle-mounted door is permitted, the vehicle-mounted door is unlocked.

  Therefore, according to the electronic key system, the owner of the electronic key does not need to perform a complicated operation using the mechanical key when getting on. Therefore, the electronic key system is excellent in convenience. Moreover, according to the electronic key system, the unlocking of the vehicle-mounted door is not permitted unless an electronic key that is much more difficult to duplicate than a mechanical key is used. Therefore, the electronic key system has a high security level.

And in order to make the electronic key provided for such an electronic key system wearable (body wearable type), the electronic key and the wrist watch are fused, thereby preventing the electronic key from being stolen, or Japanese Patent Application Laid-Open No. H10-228707 discloses an idea of preventing the electronic key from being left behind in the vehicle when getting off the vehicle.
Japanese Patent Laid-Open No. 2002-029385 (paragraph numbers 0002 to 0007) Japanese Unexamined Patent Publication No. 2004-242105 (paragraph numbers 0003 and 0021, FIG. 1)

  By the way, various types of wristwatches have been proposed in response to various needs of users, and one of them is a standard radio wave carrying time information in a watch case or band. Some have a radio clock function that corrects the time by receiving with a high-performance antenna.

  However, when trying to realize a wristwatch that has both the function of a radio timepiece and the function of an electronic key, the following problems arise. That is, in such a wristwatch, components necessary for the function of the radio clock (radio clock unit) and components necessary for the function of the electronic key (reception unit + control unit + transmission unit = electronic key unit) must be incorporated. However, if it does so, bulk and weight will increase and the mounting property to a body will worsen. Therefore, in the wristwatch having the function of the electronic key, when it originally has the function of the radio clock, the electronic key unit is built in by replacing the radio clock unit, thereby avoiding an increase in size. Therefore, consideration was given to improving wearability to the body. In short, a wristwatch equipped with a function of an electronic key omits the function of a radio timepiece, and so far it has not realized a highly accurate time display.

  The present invention has been made paying attention to such problems, and the object thereof is to provide a high accuracy with respect to time display while providing an electronic key function, and to avoid an increase in size. An object of the present invention is to provide a communication terminal capable of bidirectional communication with the communication terminal, and a communication system including the communication terminal and the communication apparatus.

In order to achieve the above object, the invention described in claim 1 transmits a request signal for establishing bidirectional communication with a communication terminal having an electronic key function, and When the ID code transmitted in response matches the reference ID code, the communication device for recognizing that the corresponding communication terminal is used has a generating means for generating the request signal with the GPS time information added thereto. And the generation means generates the request signal to which the GPS time information is added on condition that a clock index code indicating that the communication terminal has a clock function is transmitted from the communication terminal. Is the gist.
According to this configuration, the communication device generates a request signal to which GPS time information is added. When the communication terminal acquires GPS time information added to the request signal, the GPS time information can be utilized in the communication terminal. For example, in a communication terminal having a clock function, it is possible to display a time corrected using time information having extremely high accuracy such as GPS time information. Therefore, suitable two-way communication can be performed with a communication terminal having a clock function.
In particular, a request signal to which GPS time information is added is not transmitted to any communication terminal, and the transmission destination of such a request signal is limited to one having a clock function. Therefore, an appropriate request signal can be transmitted for each communication terminal after determining the functions of the communication partner (communication terminal).
The invention according to claim 2 is a function of a clock for displaying time and an ID code set individually for each communication terminal in response to a request signal transmitted from the communication device according to claim 1. In a communication terminal having a function of an electronic key for transmitting an ID code signal including the terminal-side generation means for generating a signal including a clock index code indicating that the communication terminal has the clock function, and the terminal-side generation Terminal-side transmission means for transmitting the signal generated by the means, and terminal-side control means for displaying the time corrected using the GPS time information when the GPS time information added to the request signal is acquired. It is the gist of having.

  According to this configuration, the communication terminal has both a clock function and an electronic key function. And when a communication terminal acquires the time information which has the very high precision called GPS time information regarding the function of a clock, it displays the time corrected using it, therefore, it is proud of the high precision regarding the display of the time. Here, since the communication terminal acquires the GPS time information by using the function of the electronic key that is originally provided, the communication terminal needs a GPS receiving antenna that directly receives the GPS time information transmitted from the GPS satellite. do not do. Therefore, while providing the function of the electronic key, it is highly accurate with respect to the time display, and it is possible to avoid an increase in size.

According to a third aspect of the present invention, in the communication terminal according to the second aspect, the terminal side control means indicates that the time correction is completed when the correction of the display time using the GPS time information is completed. The gist is to generate the ID code signal to which the correction completion code is added.

  According to the configuration, when the communication device acquires the correction completion code added to the ID code signal, the time when the communication device is to transmit GPS time information next is set using the time when the correction completion code is acquired as an index. It becomes possible to decide. Here, if the display time is corrected once using the GPS time information, it is not necessary to repeat the time correction frequently. For example, the time correction may be performed on the next day. Therefore, by adopting a configuration in which the correction completion code is transmitted from the communication terminal, it is possible to avoid that the request signal to which the GPS time information is added is transmitted from the communication device more than necessary.

The gist of the invention described in claim 4 is that it comprises the communication terminal according to claim 2 or claim 3 and the communication device according to claim 1 .
According to this configuration, it is possible to carry out suitable two-way communication between a communication terminal and a communication device that have a high accuracy with respect to time display while having an electronic key function and can avoid an increase in size. Can do.

Since this invention is comprised as mentioned above, there exist the following effects.
According to the present invention, while providing the function of an electronic key, it is highly accurate with respect to time display, and it is possible to avoid an increase in size.

Hereinafter, an embodiment in which the present invention is embodied in an automobile electronic key system will be described.
As shown in FIG. 1, an electronic key system 1 is applied to the automobile of this embodiment. The electronic key system 1 includes a portable device 2 possessed by a vehicle owner and a security device 3 provided on the vehicle side, and bidirectional communication between the portable device 2 and the security device 3 is possible. is there.

  The portable device 2 has a reception function by wireless communication and a transmission function by wireless communication, and includes a reception antenna 21, a reception circuit 22, a microcomputer 23, a transmission circuit 24, and a transmission antenna 25. The receiving antenna 21 is a medium for receiving a request signal transmitted from the security device 3. The reception circuit 22 demodulates the request signal received by the reception antenna 21 to generate a reception signal and outputs the reception signal to the microcomputer 23.

  The microcomputer 23 includes a nonvolatile memory 23a. In the memory 23a, an ID code (ID code of the portable device 2) set individually for each portable device 2 is stored. When the reception signal is input from the reception circuit 22, the microcomputer 23 generates a signal (ID code signal) including the ID code of the portable device 2 and responds to the request signal, and transmits the ID code signal to the transmission circuit 24. Output to. The transmission circuit 24 modulates the ID code signal input from the microcomputer 23 into a radio wave having a predetermined frequency (300 MHz in this embodiment). The transmission antenna 25 is a medium for transmitting the ID code signal modulated by the transmission circuit 24.

  The security device 3 has a transmission function by wireless communication and a reception function by wireless communication, and includes a transmission circuit 31, a transmission antenna 32, a reception antenna 33, a reception circuit 34, and a verification control device 35. The transmission circuit 31 modulates the request signal input from the verification control device 35 into a radio wave having a predetermined frequency (134 KHz in this embodiment). The transmission antenna 32 is a medium for transmitting the request signal modulated by the transmission circuit 31.

  Here, as indicated by a two-dot chain line in FIG. 2, the request signal is transmitted within the range of a region (predetermined region A32 outside the vehicle) that reaches a point about 1 m away from the door outside handle outside the vehicle. As a result, bidirectional communication between the portable device 2 and the security device 3 is possible within the predetermined area A32 outside the vehicle. That is, the request signal is a trigger signal for establishing bidirectional communication between the portable device 2 and the security device 3. As a result, when the portable device 2 is brought into the range within the range of the predetermined area A32 outside the vehicle, the request signal is received by the portable device 2 from the portable device 2. An ID code signal is transmitted.

  The receiving antenna 33 is a medium for receiving the ID code signal transmitted from the portable device 2 in response to the request signal. The reception circuit 34 demodulates the ID code signal received by the reception antenna 33 to generate a reception signal, and outputs the reception signal to the collation control device 35.

  The verification control device 35 includes a nonvolatile memory 35a. The memory 35a stores the same ID code (reference ID code) as the ID code of the corresponding portable device 2. The collation control device 35 outputs a request signal to the transmission circuit 31 in a state where the vehicle-mounted door is locked in order to monitor the approach of the vehicle by the owner of the corresponding portable device 2 (approach to the predetermined area A32 outside the vehicle). To do. That is, in this case, the collation control device 35 executes vehicle exterior communication control. As a result, a request signal is transmitted from the transmission antenna 32.

  The collation control device 35 determines whether or not the ID code included in the received signal matches the reference ID code when the received signal is input from the receiving circuit 34 based on the vehicle exterior communication control. That is, in this case, the collation control device 35 executes ID code collation. And when both ID codes correspond by ID code collation, while the collation control apparatus 35 recognizes that the corresponding portable device 2 was utilized, a door unlock permission signal is output to the door control apparatus 41 in this case To do. As a result, when the door outside handle is touched in such a state where unlocking of the vehicle-mounted door is permitted, the door control device 41 unlocks the vehicle-mounted door.

  Thus, when using the automobile to which the electronic key system 1 is applied, the operation at the time of boarding is simplified by using the portable device 2 as an electronic key. In other words, the portable device 2 provided for the electronic key system 1 has an electronic key function.

Next, features of the electronic key system 1 will be described.
Now, the portable device 2 of this embodiment is a wristwatch itself as shown in FIG. That is, in the present embodiment, the portable device 2 is a combination of an electronic key and a wristwatch, and thus has both an electronic key function and a watch function. Therefore, in this embodiment, the wristwatch provided with the reception antenna 21, the reception circuit 22, the microcomputer 23, the transmission circuit 24, and the transmission antenna 25 is used as the portable device 2.

  Here, as long as the portable device 2 is a wristwatch, the display time includes some errors, so it is desirable to correct it to an accurate time. In relation to this, the car navigation system 50 is electrically connected to the collation control device 35 in this embodiment. The car navigation system 50 performs operations such as acquiring GPS time information from radio waves emitted from the GPS satellite 60 and displaying an extremely accurate time corrected using the GPS time information on an in-vehicle monitor. Of course, the car navigation system 50 acquires the GPS position information from the radio wave emitted from the GPS satellite 60, but this is not directly related to the main part of the present embodiment, and is therefore omitted.

The car navigation system 50 outputs the GPS time information acquired from the GPS satellite 60 in this way to the collation control device 35.
As described above, the collation control device 35 outputs a request signal to the transmission circuit 31. In this embodiment, at this time, a request signal to which GPS time information input from the car navigation system 50 is added is generated. At the same time, such a request signal is output to the transmission circuit 31. As a result, in the present embodiment, a request signal to which GPS time information is added is transmitted from the transmission antenna 32.

  And when such a request signal is transmitted within the range of the predetermined area A32 outside the vehicle, when the portable device 2 is brought into the range, the request signal is received by the portable device 2. At this time, a reception signal (including GPS time information) of the request signal is output from the reception circuit 22 to the microcomputer 23. Then, the microcomputer 23 outputs an ID code signal to the transmission circuit 24 in order to respond to the request signal, and also instructs the display time to be corrected at the time grasped from the GPS time information included in the received signal. Is output to the clock IC 26 (time correction command signal). As a result, the clock IC 26 corrects the display time of the portable device 2 (wristwatch) to one that has extremely high accuracy suitable for GPS time information.

  In this embodiment, when the GPS time information added to the request signal is acquired by the microcomputer 23 and the clock IC 26, a control unit is configured to display the time corrected using the GPS time information. .

As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) The portable device 2 has both a clock function and an electronic key function. And when the portable device 2 acquires time information with extremely high accuracy, which is GPS time information, with respect to the function of the clock, it displays the time corrected using the time information, so it has high accuracy with respect to time display. . Here, since the portable device 2 acquires the GPS time information using the function of the electronic key that is originally provided, a GPS receiving antenna that directly receives the GPS time information transmitted from the GPS satellite 60 is provided. do not need. Therefore, as an effect related to the portable device 2, while providing the function of the electronic key, it boasts high accuracy with respect to time display and can avoid an increase in size.

  (2) The security device 3 generates a request signal to which GPS time information is added. When the portable device 2 acquires the GPS time information added to the request signal, the GPS time information can be used in the portable device 2. In the present embodiment, in the portable device 2 having a clock function, it is possible to display a time corrected using time information having extremely high accuracy such as GPS time information. Therefore, as an effect related to the security device 3, suitable two-way communication can be performed with the portable device 2 having a clock function.

  (3) The effect relating to the electronic key system 1 is that between the security device 3 and the portable device 2 that has a function of an electronic key, has high accuracy in terms of time display, and can avoid an increase in size. Can perform suitable two-way communication.

  (4) A request signal is transmitted from the security device 3 in the form of waiting for boarding, and when the user approaches the vehicle, an ID code signal is transmitted from the portable device 2 in response to the request signal. And along with such bidirectional communication, the portable device 2 acquires GPS time information and corrects the display time. Therefore, since GPS time information is exchanged by two-way communication between the portable device 2 and the security device 3, for the user, the time of the portable device 2 can be set without being aware of it. It is easy to do. In other words, the time can be adjusted every time you get on.

(5) Even if the portable device 2 does not have a radio clock function, it is possible to display a very accurate time using the GPS time information acquired from the security device 3.
In addition, the said embodiment can also be changed and actualized as follows.

  When the display time correction using the GPS time information is completed in the portable device 2, an ID code signal to which a correction completion code indicating that the time correction is completed is added (of course, the ID code of the portable device 2 is May be generated by the microcomputer 23.

  According to the same configuration, when the security device 3 acquires the correction completion code added to the ID code signal, the GPS time information should be transmitted next using the time at which the correction completion code is acquired in the security device 3 as an index. It is possible to determine the timing. Here, if the display time is corrected once using the GPS time information, it is not necessary to repeat the time correction frequently. For example, the time correction may be performed on the next day. Therefore, by adopting a configuration in which the correction completion code is transmitted from the portable device 2, it is possible to avoid that the request signal to which the GPS time information is added is transmitted from the security device 3 more than necessary.

  -In the said embodiment, regarding the bidirectional | two-way communication between the portable device 2 and the security device 3, what was transmitted from the security device 3 is called a request signal, and what is transmitted from the portable device 2 is called. This is collectively called an ID code signal. However, actually, in such bidirectional communication, the request signal and the ID code signal are transmitted stepwise. Therefore, this may be used as follows.

  That is, when the portable device 2 receives the wake signal transmitted from the security device 3, the microcomputer 23 generates a signal including a clock index code indicating that the mobile device 2 is a communication terminal having a clock function, It is transmitted from the transmission antenna 25. Then, on the condition that the clock index code has been transmitted from the portable device 2, the security device 3 generates a request signal with GPS time information added thereto, and transmits it from the transmission antenna 32. To do.

  According to this configuration, the security device 3 does not transmit a request signal to which GPS time information is added to any communication terminal, and the transmission destination of such a request signal has a clock function ( For example, it is limited to the portable device 2). Therefore, an appropriate request signal can be transmitted for each communication terminal after determining the functions of the communication partner (communication terminal).

In a wristwatch having both a clock function and an electronic key function, such as the portable device 2, the time display format may be either digital or analog.
In the above-described embodiment, the electronic key unit (mainly the microcomputer 23) and the clock unit (mainly the clock IC 26) are separate from each other in the portable device 2, but the single IC has the functions of the electronic key unit and the clock unit. You may embody in the structure which combines a function.

  In the above embodiment, the portable device 2 acquires the GPS time information in accordance with the two-way communication performed outside the vehicle between the portable device 2 and the security device 3, but the portable device 2 and the security device 3 A configuration may be adopted in which the portable device 2 acquires GPS time information in association with two-way communication performed in the vehicle. That is, the present invention may be embodied in the electronic key system 1 that automatically permits the start of the in-vehicle engine by the security device 3 when the corresponding portable device 2 is brought into the vehicle. In this case, the time of the portable device 2 can be adjusted every time the engine is started.

The block diagram which shows the structure of the motor vehicle of this embodiment to which the electronic key system is applied. Explanatory drawing which shows the predetermined area | region outside a vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic key system (communication system), 2 ... Portable machine (communication terminal), 3 ... Security apparatus (communication apparatus), 23 ... Microcomputer ( terminal side production | generation means, terminal side control means), 25 ... Transmission antenna (terminal side) Transmitting means), 26 ... clock IC (control means), 35 ... collation control device (generation means).

Claims (4)

When a request signal for establishing two-way communication with a communication terminal having an electronic key function is transmitted and the ID code transmitted in response to the request signal matches the reference ID code In a communication device that recognizes that the corresponding communication terminal has been used,
Comprises a generating means for generating the request signal added with the GPS time information,
Said generating means generates said request signal Clock index code on condition that has been transmitted from the communication terminal, obtained by adding the GPS time information indicating that the communication terminal having the function of the watch A communication device. An electronic key for transmitting an ID code signal including an ID code individually set for each communication terminal in response to a request signal transmitted from the communication device according to claim 1 and a clock function for displaying time In a communication terminal having the function of
Terminal-side generating means for generating a signal including a clock index code indicating that the communication terminal has the clock function;
Terminal-side transmission means for transmitting the signal generated by the terminal-side generation means;
When acquired GPS time information that is added to the request signal, the communication terminal characterized by comprising a terminal-side control means for displaying the time corrected by using the GPS time information. The communication terminal according to claim 2,
The terminal-side control means generates the ID code signal to which a correction completion code indicating that the time correction is completed is added when the correction of the display time using the GPS time information is completed. Terminal. Communication system for a communication terminal according to claim 2 or claim 3, characterized in that a communication device according to claim 1.

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