JP2009094767A - Radio device, control method therefor and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve key position discrimination required for a smart key or the like by a simple constitution by a directivity switching antenna. <P>SOLUTION: A planar directional antenna 8 installed on the ceiling of a vehicle 9 receives an electric wave from a mobile radio device 6 to measure an electric wave intensity level, whereby the location of the mobile radio device 6 is discriminated from a relationship between directions of directivities 10, 11 and 12 and RSSI values. Thus, functions of unlocking only a door at the side of the mobile radio device 6, preventing the start of unauthorized engine having no mobile radio device 6, preventing doors from being left locked by a key in the vehicle, etc. when locking and unlocking doors of the vehicle or starting an engine can be conducted without installing a plurality of additional antennas for keyless entry and smart key functions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-vehicle wireless key device such as a smart entry (registered trademark) or smart key (registered trademark) of a vehicle. In particular, the present invention unlocks only the door on the side close to the user holding the portable device. Or the security function of the in-vehicle wireless key device that prevents the key from being confined in the vehicle.

  In recent years, the door lock is unlocked just by holding a portable key with a built-in wireless device, such as Smart Entry (registered trademark) or Smart Key (registered trademark) as an in-vehicle wireless key device, just by approaching the vehicle. Now, there is a wireless key device that allows you to open the door and get in just by raising the door knob or touching the entry switch without turning the key into the keyhole.

  In such a wireless key device, when a user touches a knob or switch on a door of a vehicle, or when the radio wave intensity level of transmission / reception that is intermittently repeated exceeds a threshold value, the user holding the portable key approaches the vehicle. The ciphertext including an authentication code (hereinafter referred to as ID) is communicated with each other to collate the ID, and if it is determined that the mobile key is correct, the door is unlocked.

  In addition to this function, from the viewpoint of security, a protective function that unlocks only the door on the side where the mobile key is located to prevent a suspicious person hidden on the other side of the vehicle from getting in, and destroying the window to the vehicle It is usually equipped with functions such as a protection function that prevents the engine from starting unless you have a portable key even if you get in, a convenience function that prevents locking if you forget to put the portable key in the car It is.

  In order to realize such a function, it is necessary to determine the position of the portable key at the time of locking / unlocking or engine starting, and weak wireless for performing communication that triggers the start of communication and communication including ID In addition to the machine, 5-6 or more long-wave antennas are provided in each part of the vehicle under the dashboard, between the driver's seat and the front passenger seat, inside each door, and inside the mirror to specify the position of the portable key. (For example, refer to Patent Document 1).

In Patent Document 1, an electric field intensity level is measured between a plurality of antennas installed at a plurality of positions and a portable key, and a position of the portable device is specified from a correlation between each of the plurality of antenna positions and the electric field intensity level. It has become.
JP 2002-77972 A

  In the conventional method, it is necessary to install a plurality of antennas for determining the position of the portable key. There are many cases where the installation location must be installed on a movable part such as a door or a mirror. For example, it is not a good idea in view of the number of man-hours for installation work and the cost required for harnesses.

  The present invention has been made in order to solve the above-described conventional problems, and the direction of the switched directivity is switched by switching the area (hereinafter referred to as directivity) where the radio wave transmission / reception sensitivity of the antenna provided at one place is strong. The position of the portable key is determined by measuring the electric field strength level for each.

  This eliminates the need to install multiple antennas for each part of the vehicle for keyless entry and smart key functions, and allows the position of the portable key to be determined when the vehicle door is locked and unlocked or when the engine is started. Unlock only the door on the side where the mobile device is located, prevent unauthorized engine starting, and prevent key lock-in without increasing the design and installation man-hours and adjustment effort Such a function can be realized, and an improvement effect of security and convenience can be realized.

  Therefore, in order to solve the conventional problem, in a wireless device having a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable wireless device, the portable wireless device includes: First receiving means for receiving a request signal from the in-vehicle wireless device, measuring means for measuring the electric field strength level of the request signal, and first transmitting means for returning an answer signal including a measurement value of the measuring means The in-vehicle wireless device includes a directional antenna unit that switches an area having a high radio wave transmission / reception sensitivity in a plurality of directions, and a second transmission unit that switches at least a part of the request signal in the plurality of directions and transmits the request signal. Second receiving means for receiving an answer signal returned from the portable wireless device, and the portable information based on the measurement values for each of the plurality of directions included in the answer signal. So that and a position determining means for performing position determination of the radio.

  This makes it possible to determine the direction of presence of the portable device from the relationship between the directivity of the antenna and the electric field strength level without having to provide multiple antennas in each part of the vehicle. It is possible to perform control with high security and convenience according to the result of determining the position of the machine.

  Thus, the keyless entry and smart key functions can be realized without the need to install a plurality of antennas in each part of the vehicle, and an in-vehicle wireless device that is excellent in security and convenience can be provided.

  1st invention is a radio | wireless apparatus which has the portable radio | wireless machine which a user possesses, and the vehicle-mounted radio | wireless machine which performs radio | wireless communication between the said portable radio | wireless machines, The said portable radio | wireless machine is a request from the said vehicle-mounted radio | wireless machine. A first receiving means for receiving a signal; a measuring means for measuring an electric field strength level of the request signal; and a first transmitting means for returning an answer signal including a measurement value of the measuring means. A directional antenna means for switching an area where radio wave transmission / reception sensitivity is strong in a plurality of directions, a second transmission means for switching at least a part of the request signal in the plurality of directions, and a portable radio A second receiving means for receiving the returned answer signal, and a position for determining the position of the portable wireless device based on the measured values for each of the plurality of directions included in the answer signal; So that and a determination unit.

  As a result, by switching the directivity of the antenna installed at one place, it is not necessary to newly install a plurality of antennas for determining the position of the portable wireless device in each part of the vehicle, and according to the position of the portable wireless device. It is possible to control the optimal vehicle equipment.

According to a second aspect of the present invention, in the wireless device having a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable device, the portable wireless device transmits an electric field strength level measurement signal. The in-vehicle wireless device includes a directional antenna unit that switches an area having high radio wave transmission / reception sensitivity in a plurality of directions, and at least a part of the electric field strength level measurement signal in the plurality of directions. The second receiving means for switching and receiving, the measuring means for measuring the electric field intensity level of the electric field intensity level measurement signal, and the measured value of the electric field intensity level for each of the plurality of directions measured by the electric field intensity level measuring means. Based on this, a position determining means for determining the position of the portable wireless device is provided.

  As a result, by switching the directivity of the antenna installed at one place, it is not necessary to newly install a plurality of antennas for determining the position of the portable wireless device in each part of the vehicle, and according to the position of the portable wireless device. In addition, it is possible to control the optimal vehicle equipment, and the field strength level is measured on the in-vehicle wireless device side, so there is no need to transmit the measured value from the form wireless device, improving security against eavesdropping etc. it can.

  In addition to the first and second inventions, the third invention performs the position determination of the portable wireless device by the position determination means when a user operates an unlocking switch provided in the door of the vehicle, When the position is in the vicinity of the touched vehicle door, the door is unlocked.

  This eliminates the need to install a plurality of antennas in each part of the vehicle to determine the position of the portable wireless device by using radio waves from the tire pressure sensor wireless device, and does not unlock any doors other than the necessary doors. A wireless device can be realized.

  According to a fourth aspect of the invention, in addition to the first to second aspects, when the user operates a locking switch provided on the door of the vehicle, the position determination unit determines the position of the portable wireless device, The door is locked when the position is outside the vehicle.

  As a result, by switching the directivity of the antenna installed in one place, it is not necessary to install a plurality of antennas in each part of the vehicle in order to determine the position of the portable wireless device, Therefore, it is possible to realize a highly convenient wireless device that does not cause inconvenience.

  According to a fifth invention, in addition to the first to second inventions, when a user operates an engine start switch of the vehicle, the position determination unit performs position determination of the portable wireless device, and the position is The engine is started when the vehicle is in the vehicle.

  By switching the directivity of the antenna installed at one place, it is not necessary to install a plurality of antennas for determining the position of the portable wireless device in each part of the vehicle. A wireless device with high security in which the engine cannot be started even when boarded.

  According to a sixth aspect of the present invention, in the wireless device control method including a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable wireless device, the in-vehicle wireless device has strong radio wave transmission / reception sensitivity. A step of switching an area in a plurality of directions, a step in which the portable radio transmits at least a part of a request signal from the in-vehicle radio to the portable radio in the plurality of directions, and the in-vehicle radio The step of receiving the request signal, the step of measuring the electric field strength level of the request signal by the in-vehicle wireless device, and the answer signal including the measurement value in the measuring step from the portable wireless device from the portable wireless device Returning to the in-vehicle device, receiving the answer signal from the portable radio, and receiving the answer signal from the portable radio A control method of a wireless apparatus for performing the steps of performing position determination of the portable radio device based on Mareta measurement value of each of the plurality of directions.

  As a result, by switching the directivity of the antenna installed at one place, it is not necessary to install multiple antennas for determining the position of the portable wireless device in each part of the vehicle, and the optimum according to the location of the portable wireless device. A control method for vehicle equipment becomes possible.

  A seventh invention is a program for executing at least a part of the wireless device according to the first to fifth inventions.

  Since it is a program, it is possible to easily realize at least a part of the wireless key system of the present invention by cooperating hardware resources such as an electric / information device, a computer, and a server. In addition, the program can be distributed / updated and installed easily by recording on a recording medium or distributing the program using a communication line.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to these embodiments.

(Embodiment 1)
FIG. 1 shows a schematic configuration diagram in the case of configuring as an in-vehicle wireless key device as an example of the wireless device according to the first embodiment. FIG. 1 shows a schematic top view of the vehicle 9, and only the arrangement of each wireless device in the tires 1, 2, 3, 4 and the vehicle body is schematically shown except for structures such as the upper part of the vehicle and seats. The upper part of the figure is the vehicle front side.

  In FIG. 1, an in-vehicle wireless device 8 is installed on a ceiling in a vehicle as an example, and is connected to a vehicle control device (hereinafter, ECU) that is an electric control unit that performs electric control of the entire vehicle. The direction of the areas 10, 11, 12 (hereinafter referred to as directivity) can be switched so that the radio wave transmission / reception sensitivities at 11, 12 are increased.

  For example, a typical example of a method for realizing an antenna capable of switching directivity is a low-profile antenna using a capacity-loaded monopole antenna. These can be configured as a planar antenna that can be mounted on a ceiling of a vehicle. An antenna center polygonal patch is provided, and patch electrodes serving as radiating elements are arranged around the antenna patch at every 120 degrees, and electrically with respect to any one or two patch electrodes. Some devices can change directivity in three directions by switching power feeding.

  This in-vehicle wireless device 8 has a function as a receiver of a keyless entry function by interlocking with the program of the ECU 7, and an operation such as pressing or touching a switch provided in the portable wireless device 6 possessed by the user 5 When the radio wave is received, the received content is input to the ECU, and control such as unlocking the door and starting the engine is performed.

  In FIG. 1, the portable wireless device 6 is easily carried by the user 5 such as a key holder as a portable key held by the user 5 as an integral configuration with a mechanical key for manually opening and closing the door, starting the engine, and the like. Configure in shape.

  In the first embodiment, when communicating between the portable wireless device 6 and the in-vehicle wireless device 8, the directivity of the in-vehicle portable device 8 is switched to the areas 10, 11, and 12, and the radio waves in the respective directivities are switched. The field strength level (hereinafter, RSSI) is measured, and the position of the portable wireless device 6 is determined based on the RSSI magnitude relationship in each directivity.

  Thereby, the ECU 7 determines the position of the portable wireless device 6 when the user locks / unlocks the vehicle door or starts the engine, and executes control according to the position, thereby providing convenience such as security and prevention of key confinement. An improved wireless device can be realized.

That is, when the user touches a knob or switch (not shown) of the vehicle door to open the door, the portable wireless device 6 does not exist in the existing area including the vehicle door, and the portable wireless device 8 is used when starting the engine. If the vehicle does not exist in the vehicle including the driver's seat, the vehicle door is locked and the vehicle door is locked as well as a security function that keeps the vehicle door locked and prevents the engine from starting. If the portable wireless device 6 is present in the vehicle when the operation is performed, a utility function can be realized such that the lock is not executed and a buzzer notifies the user and prevents key confinement.

  FIG. 2 is a block diagram showing the configuration of each wireless device. The portable wireless device 6 is a wireless device portion configured in a portable key possessed by the user. The transmission unit 16 as the transmission means, the reception unit 18 as the first reception means, and the identification code (hereinafter referred to as ID) included in the received message determines whether the message is from the other party to communicate with and decrypts the encrypted message The authentication part 17 which performs etc., the electric field strength level measurement part 14 which is a measurement means which measures RSSI of a received telegram, and the antenna part 13 are provided. The control unit 15 may be configured by a microcomputer, a memory, and its peripheral circuits, and the authentication unit 17 may be executed as part of the processing of the microcomputer that configures the control unit 15 according to a program stored in advance.

  Similarly, the in-vehicle wireless device 8 includes a control unit 20, a field strength level measurement unit 19, an authentication unit 22, a transmission unit 21 serving as a second transmission unit, a reception unit 23 serving as a second reception unit, and an antenna unit 25. Is provided. Furthermore, the in-vehicle wireless device 8 includes a directivity switching unit 24. The directivity switching unit 24 constitutes a directional antenna unit together with the antenna unit 25, and connects or disconnects the plurality of radiating patch electrodes constituting the antenna unit 25 by a signal from the control unit 20. Switch. In addition, the directivity switching unit 24 is configured to include a phase circuit that advances and delays the phase of the radio signal as necessary, depending on the number and configuration of the radiating patch electrodes.

  In general, when the influence of multipath such as reflection or diffraction of radio waves is not large, the RSSI of the received radio waves is attenuated along with the distance from the transmission source due to propagation attenuation. Also, the radio wave from the direction of directivity has a larger RSSI than the radio wave from the other direction. Therefore, the relative position between the in-vehicle wireless device 8 and the portable wireless device 6 can be substantially determined based on the direction of directivity and RSSI. Further, in order to accurately perform this position determination, a reference table is created based on data obtained by measuring RSSI in advance in the vehicle interior and in the vicinity of the vehicle and stored in the control unit 20 to calculate an error distance from the reference table. Such a method is also effective.

  In the case of a simplified example in FIG. 1, when the RSSI measured with the portable key 6 is compared, the directivity of the directional antenna 8 is switched to the area 10, and the directivity is transferred to the other areas 11 and 12. If the RSSI is the maximum compared to the bag that has been switched, it can be determined that there is a user near the door on the driver's seat side. In addition, if the RSSI is maximum when the directivity is switched to the area 12 as compared with the case where the directivity is switched to the other areas 10 and 11, it can be determined that there is a user in the rear trunk direction. Furthermore, when large RSSI is measured in a plurality of areas, such as when the directivity is switched to the areas 10 and 11 is extremely larger than the remaining area 12, it can be determined that the vehicle is in the vehicle interior.

  These determination methods are examples when the area is set to three as shown in FIG. 1 for simplification, but the number of radiating patch electrodes of the antenna unit 25 is increased to increase the switching area, It is possible to improve the accuracy of the position determination of the portable key 6 by a method such as calculating a ratio with the RSSI place of another area and limiting the numerical range of the RSSI value by providing a threshold value.

  Therefore, for example, such a determination is made at the timing when the user 5 touches the door knob or the entry switch provided for the keyless entry function to open the vehicle door, and the user possesses the portable key 6 indicating that the user is a legitimate user. However, by determining whether the door of the driver's seat, the passenger seat, or the rear trunk is intended to be opened, the door at the location where the user 5 is not left is kept locked.

  As a result, when the user 5 tries to get into the vehicle 9, the suspicious person lurking on the opposite side of the vehicle opens the opposite door at the timing of opening the door of the user 5, and performs an illegal act. A keyless entry device that can be prevented and has high crime prevention can be realized.

  Finally, an example of a flow showing the operation of the ECU 7 and each radio when determining which direction the user 5 holding the portable key 6 is in will be described with reference to FIGS. 3 and 4.

  First, in the operation flow diagram of FIG. 3, when the user holding the portable key 3 touches the door knob or the entry switch for keyless entry to open any one of the driver seat, the passenger seat, and the rear trunk (step S30). The ECU detects that the door is about to be opened from a touch sensor installed on the door. The ECU sends a signal to the in-vehicle wireless device 8 to switch the antenna directivity to the areas 10, 11, and 12, respectively, and transmit the radio waves RF42, 43, and 44 that sequentially become request signals.

  On the other hand, the portable wireless device 6 performs carrier sense for checking whether or not radio waves are transmitted every predetermined time (step S35). If no radio waves are transmitted, step S35 is repeated every predetermined time.

  The radio wave RF42 transmits a synchronization signal for an interval time in which the portable radio 6 performs carrier sense to the header portion, and the portable radio 5 receives the RFs 42, 43, and 44 in synchronization with this synchronization signal. At this time, each of the RFs 42, 43, and 44 may be provided with a synchronization signal, but may be transmitted as a part of each continuous message.

  When it is detected in step S35 that the radio wave is transmitted by carrier sense, the portable wireless device 6 measures and stores the RSSI with the directivity of each of the areas 10, 11, and 12. In this case, the directivity switching on the in-vehicle wireless device 8 side can be carried out if a communication protocol is determined in advance so that switching is made to RF43 and RF44 every time a fixed-length or fixed-length message is transmitted after the synchronization portion of the radio wave RF42. The wireless device 6 can detect any directivity switching timing, and can determine the RSSI for each directivity.

  Although not shown, the radio waves RF42, RF43, and RF44 include an ID for authenticating that the in-vehicle wireless device 8 and the portable wireless device 6 are a valid combination. Is not authenticated, the measured RSSI is discarded. The RSSI value is also discarded when the radio wave with any directivity is too weak to be received or when the radio wave is smaller than a predetermined threshold.

  When the RSSI values for the respective orientations of the areas 10, 11, and 12 are measured in step S 36, the telegram RF 45 that is an answer signal including these values is transmitted to the in-vehicle wireless device 8. The in-vehicle wireless device 8 that has received the electronic message RF45 inputs this to the ECU 7 (step S37). Upon obtaining the RSSI measurement values for each directivity, the ECU determines the location of the portable wireless device 6 from these values (step S38), and the position of the portable key 6 matches the direction of the door touched in step S30. If (step S39), the door is unlocked (step S41). If they do not match in step S39, the door is locked or remains locked (step S40).

  At this time, if answer back control that notifies that the door unlocking has been accepted or that the door at an illegal position has been operated, such as turning on a hazard lamp or sounding a horn or warning buzzer, More effective.

  Moreover, instead of determining the position of the portable key 6 in the ECU 7 in step S38 by returning the RSSI, the position determination on the portable wireless device 6 or the in-vehicle wireless device 8 is performed until the position is determined. May be transmitted as an RF46 message.

  In addition, depending on which door is to be determined, the directivity areas do not necessarily have to be three, and may be increased or decreased. For example, when only the driver's seat door is determined, a configuration in which a radio wave for RSSI measurement is transmitted only from the directivity direction toward the areas 10 and 11 is also possible.

  Next, FIG. 4 illustrates a configuration in which a radio wave for RSSI measurement is transmitted from the portable key 6 side as another sequence. Compared to FIG. 3, since it is not necessary to transmit the measured RSSI, it is effective in enhancing security against sophisticated fraud such as wiretapping.

  In FIG. 4, when the user approaches the vehicle and touches the door (step S43), the ECU sends a signal indicating that the door has been touched to the in-vehicle wireless device 8, and the in-vehicle wireless device 8 A request message (RF52) for transmitting the RSSI measurement message for determining the position from the portable key 6 is transmitted (step S44).

  On the other hand, the portable wireless device 6 performs carrier sense to check whether there is a transmission radio wave at a certain interval (step S45). If there is a radio wave, this request message (RF52) is received and the RSSI measurement is performed. The process proceeds to a process for sending an answer message (RF53). If there is no radio wave, the carrier sense process in step S45 is continued.

  The in-vehicle wireless device 8 sequentially switches the directivity to areas 10, 11, and 12 to measure the RSSI of the answer telegram RF52 (steps S47 to S49), and is input to the ECU 7 by an interface signal that connects the in-vehicle wireless device 8 and the ECU 7. The Subsequently, the ECU 7 determines the position of the portable key 6 from the input RSSI (step S50).

  As a determination method, the same method as described in FIG. 3 can be applied. In other words, as an example of a determination method that simplifies the description, the RSSI measured by the RSSI measurement message (RF53) indicates in which area the portable device key 6 exists, that is, the largest RSSI is obtained. It can be determined that the portable device key 6 is present in the measured area. Now, if the RSSI measured when switching to the directional area 10 is maximum, it can be determined that the user who has the portable key 6 is in the vicinity of the door on the driver's seat side.

  In the above description, the configuration in which the presence position of the portable key 6 is determined by the ECU 7 is described. However, a configuration in which the determination is performed by the in-vehicle wireless device 8 and the result is input to the ECU 7 may be employed.

  Subsequently, the position of the portable device is determined in step S50, and it is determined whether or not the result coincides with a certain direction of the touched door in step S43 (step S51). If they match, the touched door is unlocked. If they do not match, it is determined that the door has been touched by a suspicious person who does not have the portable key 6 and the door remains locked (step S52).

In the description so far, the description has been made when unlocking the vehicle door, but the present invention can be similarly applied when the engine is started or when the vehicle is getting off. For example, when the engine start switch is operated, a determination is made according to the sequence of FIG. 3 or FIG. 4 and control is performed so that the engine is not started unless the portable key 6 is in the vehicle or in the vicinity of the driver's seat. When the door lock switch is operated, the judgment is made according to the sequence shown in FIG. 3 or FIG. 4. The portable key 6 is not in the car or is not locked near the door on the driver's side. It is possible to realize a configuration for performing control to perform the notification.

  In the description of FIG. 4 so far, the example in which RSSI is measured by wireless communication that is transmitted / received by using the operation of the user 5 touching the door of the vehicle as a trigger has been shown, but the portable wireless device 6 periodically transmits the RSSI measurement message. If the transmission is repeated and received by the in-vehicle wireless device 8 and the location of the mobile key 6 is determined in advance, the location of the mobile key 6 can be determined in advance when the user 5 approaches the vehicle. This is effective in that the response is faster than the determination after touching the door.

  Furthermore, even when the user 5 implements a remote operation function in which the user 5 manually performs the operation of locking and unlocking the vehicle door provided in the portable key 6 by pressing the manual switch, the in-vehicle wireless device 8 performs this remote operation. If the RSSI of the operation radio wave is measured to determine the location of the portable key 6, the door on the opposite side of the vehicle is kept locked to prevent suspicious people from entering the vehicle or extremely away from the vehicle. Security can be improved by not accepting unlocking.

  Finally, the first embodiment has been described as a wireless device for keyless entry (registered trademark) and smart entry (registered trademark) of a vehicle. For example, if there is no portable key in the vicinity, a settlement function, an address book display, a call A mobile phone system that locks functions, a system that automatically unlocks when a mobile key is brought close to the electronic lock of the front door, and an administrator who has the mobile key is in the vicinity of the device. If not, it can be widely applied to devices other than mobile phones, such as printers and personal computers that cannot accept input.

  Note that the means described in this embodiment causes hardware resources such as a CPU (or microcomputer), a RAM, a ROM, a storage / recording device, an electrical / information device including an I / O, a computer, a server, and the like to cooperate. You may implement with the form of a program. In the form of a program, new functions can be easily distributed / updated and installed by recording them on a recording medium such as magnetic media or optical media or distributing them via a communication line such as the Internet.

  As described above, according to the present invention, the position of the portable wireless device can be specified without requiring man-hours for attaching antennas to a plurality of locations of the vehicle, and the portable wireless device can be used when locking / unlocking the vehicle door or starting the engine. It is possible to realize a wireless device with high security and convenience according to the result of determining the position of.

  Further, the present invention can be used not only for keys but also for wireless authentication systems that perform authentication.

1 is a schematic perspective view showing an example in which a wireless device according to Embodiment 1 as an example of the present invention is arranged in a vehicle. Schematic block diagram showing the configuration of each radio of the radio device according to the first embodiment of the present invention. The flowchart which shows an example of the communication sequence in the case of unlocking of the vehicle door in Embodiment 1 of this invention. The flowchart which shows another example of the communication sequence in the case of unlocking of the vehicle door in Embodiment 1 of this invention.

Explanation of symbols

5 User 6 Mobile key (mobile radio)
7 Vehicle control unit (ECU)
8 In-vehicle wireless device 9 Vehicle 10, 11, 12 Directionality (area with strong electric field transmission / reception sensitivity)
14 Electric field strength level measurement unit (measuring means)
16 Transmitter (first transmitter)
18 Receiving unit (first receiving means)
19 Electric field strength level measuring unit (measuring means)
21 Transmitter (second transmitter)
23 Receiving unit (second receiving means)
24 Directivity switching unit (directivity unten means)
25 Antenna part (directional antenna means)

Claims (7)

In a wireless device having a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable wireless device, the portable wireless device receives a request signal from the in-vehicle wireless device. Receiving means, measuring means for measuring the electric field intensity level of the request signal, and first transmitting means for returning an answer signal including a measurement value of the measuring means, and the in-vehicle wireless device has radio wave transmission / reception sensitivity. Directional antenna means for switching a strong area in a plurality of directions, second transmission means for switching and transmitting at least a part of the request signal in the plurality of directions, and an answer signal returned from the portable radio Second receiving means for receiving, and position determining means for determining the position of the portable wireless device based on the measurement values for each of the plurality of directions included in the answer signal. For example was the wireless device. In a wireless device having a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable device, the portable wireless device transmits first signal strength level measurement signals. The in-vehicle wireless device includes a directional antenna means for switching an area where radio wave transmission / reception sensitivity is strong in a plurality of directions, and a second for switching and receiving at least a part of the electric field strength level measurement signal in the plurality of directions. Receiving means, measuring means for measuring the electric field intensity level of the electric field intensity level measurement signal, and the portable radio based on the measured value of the electric field intensity level for each of the plurality of directions measured by the electric field intensity level measuring means A wireless device comprising position determining means for determining the position of the machine. When the position of the portable wireless device is determined by the position determining means when the user operates an unlocking switch provided on the door of the vehicle, and the position of the portable wireless device is in the vicinity of the touched vehicle door The wireless device according to claim 1, wherein the door is unlocked. When a user operates a locking switch provided on a vehicle door, the position determination unit determines the position of the portable wireless device, and locks the door when the position of the portable wireless device is outside the vehicle. The wireless device according to claim 1 or 2. Claims: When a user operates an engine start switch of a vehicle, the position determination unit determines the position of the portable wireless device, and starts the engine when the position of the portable wireless device is within the vehicle. Item 3. The wireless device according to Item 1 or 2. In a control method of a wireless device having a portable wireless device possessed by a user and an in-vehicle wireless device that performs wireless communication with the portable wireless device, the in-vehicle wireless device has areas where radio wave transmission / reception sensitivity is strong in a plurality of directions. A step of switching, a step in which the portable wireless device switches and transmits at least a part of a request signal from the vehicle-mounted wireless device to the portable wireless device in the plurality of directions, and the vehicle-mounted wireless device receives the request signal. A step of measuring the electric field strength level of the request signal by the in-vehicle wireless device; and the in-vehicle wireless device returns an answer signal including a measurement value in the measuring step from the portable wireless device to the in-vehicle device. A step in which the portable radio device receives the answer signal; and the portable radio device is included in the answer signal. Control method for a wireless device based on the measurement values for each direction of performing the steps of performing position determination of the portable radio. The program which performs at least one part of the radio | wireless apparatus of any one of Claims 1-5.

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