JP6350862B2 - Electronic key system - Google Patents

Description

The present invention relates to an electronic key system .

  An electronic key system (also referred to as a smart entry system) that realizes various functions in a vehicle by wireless communication between a portable device possessed by a user and an in-vehicle device mounted on the vehicle does not use a mechanical key. However, authentication can be performed between the portable device and the in-vehicle device, and operations desired by the user such as door unlocking, trunk opening, and engine starting can be performed based on the authentication result.

  In recent years, in addition to the original function of the electronic key system, when the user puts the portable device in the search mode, the response signal from the in-vehicle device is received by the portable device, the direction of the received signal is determined, and the corresponding direction is determined. A moving body position detection system capable of turning on an LED of a portable device has been devised (see Patent Document 1). Thus, the direction in which the vehicle is located is displayed on the portable device according to the user's instruction, and the corresponding own vehicle can be found only by displaying the portable device.

  Moreover, when there are a plurality of portable devices, an electronic key system has been devised that allows portable devices to search each other (see Patent Document 2). Thus, unlike a dedicated portable device search device that is used only for searching portable devices, each of the plurality of portable devices can be used for the original purpose of the portable device (use as an electronic key). More operational opportunities than machine search devices.

JP 2001-208820 A Japanese Patent No. 48882725

  When patent document 1 and patent document 2 are combined, the search of the vehicle by a portable device and the portable device search by portable devices can be performed. However, when the user in the vehicle interior puts the portable device in the search mode, the response signal from the vehicle is received in addition to the response signal from the portable device, and there is a problem that the approach of the desired portable device cannot be determined.

In view of the above problems, an object of the present invention is to provide an electronic key system capable of searching for a vehicle or another portable device more reliably.

An electronic key system for solving the above problems includes an in-vehicle device mounted on a vehicle and a portable device possessed by a user, and the portable device uses a radio wave in the first frequency band from the in-vehicle device. A first portable device receiving unit that receives a predetermined response request signal, and a second portable device transmission that transmits a response signal to the response request signal using radio waves in a second frequency band different from the first frequency band. A vehicle-mounted device includes a first vehicle-mounted device transmitting unit that transmits a response request signal and a second vehicle-mounted device receiving unit that receives the response signal. An electronic key system that executes control, and when the portable device transitions to a search mode different from the normal operation mode, the second portable device transmission unit identifies the portable device at a predetermined timing. Search frame including mobile device ID A second mobile device receiver that receives a search response signal including a vehicle-mounted device ID for identifying the vehicle-mounted device, which is a transmission source ID, in response to a search command from the vehicle-mounted device, and a search response when a signal is received, and a notification unit for notifying to that effect, further example Bei a vehicle device, includes a vehicle device storage unit for previously registered portable device ID, a search command to the second vehicle device receiving section has received And a second in-vehicle device transmission unit that transmits a search response signal when the portable device ID is stored in the in-vehicle device storage unit , the response signal includes the portable device ID, and the in-vehicle device is included in the response signal A collation unit that collates the portable device ID that is stored in the in-vehicle device storage unit, and a temporary storage unit that stores the portable device ID of the portable device that has been correctly collated by the collation unit. , Mobile devices included in the search command When D is stored in the temporary storage unit, the second vehicle device transmission unit characterized in that it does not transmit a search response signal.

  In addition, a portable device of an electronic key system for solving the above problem is a first portable device that receives a predetermined response request signal using radio waves in the first frequency band from an in-vehicle device mounted on a vehicle. And a second portable device transmitter that transmits a response signal to the response request signal using radio waves in the second frequency band, which is different from the first frequency band, and the in-vehicle device uses the response signal as a response signal. When the portable device of the electronic key system that executes various controls based on the search mode is changed from the normal operation mode, the second portable device transmission unit obtains a portable device ID for identifying the portable device. A second portable device receiving unit for receiving a search response signal including an in-vehicle device ID for identifying the in-vehicle device, which is a transmission source ID, which transmits a search command including, and responds to the search command from the in-vehicle device; The second portable device receiver When receiving a search response signal further comprises a notification unit for notifying to that effect, the.

  Unlike the conventional configuration, in the configuration of the present invention, the in-vehicle device can receive radio waves in the second frequency band even after the engine is started (for example, when the ignition switch is on). Thereby, it is possible to respond to a search command from the portable device. Further, since the in-vehicle device transmits a search response signal only when a search command is received from a portable device having a pre-registered portable device ID, the vehicle can be searched more reliably.

The figure which shows the structure of an electronic key system. The flowchart explaining the normal processing of a portable machine. The flowchart explaining the search process of a portable device. The flowchart which shows the communication control process of a vehicle-mounted apparatus. The figure which shows the example of the communication sequence between vehicle equipment and a portable device. The figure which shows another example of the communication sequence between vehicle equipment and a portable device.

  As shown in FIG. 1, an electronic key system 100 includes an in-vehicle device 1 mounted on a vehicle 101, and portable devices 2 and 3 (a portable device of the electronic key system according to the present invention) possessed by a user. Note that although a plurality of portable devices are illustrated, in the configuration in which the portable device searches for the in-vehicle device 1 (see FIG. 5), which will be described later, at least one portable device is sufficient.

  The in-vehicle device 1 includes an ECU 10, an LF transmission unit 11, a UHF transmission / reception unit 12, an engine switch 15, a door antenna 16 (a general term for 16FR, 16RR, 16FL, and 16FR), an indoor antenna 17, a trunk antenna 18, an trunk trunk antenna 19, and the like. Is provided.

  The ECU 10 includes a well-known CPU 10a (a collation unit of the present invention), a memory 10b for storing an in-vehicle device control program (an in-vehicle device storage unit and a temporary storage unit of the present invention), a signal input / output circuit (not shown), and the like. Configured as a computer. Various functions as the vehicle-mounted device 1 are realized by the CPU 10a executing the vehicle-mounted device control program.

  The memory 10b uses, for example, a nonvolatile storage medium such as a flash memory, and stores data necessary for the operation of the in-vehicle device 1 in addition to the in-vehicle device control program. Further, the memory 10b stores an in-vehicle device ID for identifying the in-vehicle device 1. Further, a portable device ID for identifying a portable device (generic name for the portable devices 2 and 3, hereinafter the same) is registered. Registration is performed at the time of factory shipment or when a portable device is added. This portable device ID is used as a master code described later.

  The LF transmitter 11 transmits a radio signal to the portable device using radio waves in the LF band (first frequency band of the present invention). Radio signals transmitted from the LF transmission unit 11 are respectively near the door (outside the vehicle compartment), inside the vehicle compartment, inside the trunk, and outside the trunk via the door antenna 16, the indoor antenna 17, the antenna inside the trunk 18, and the antenna outside the trunk 19, respectively. It reaches only within a limited communication area in the vicinity (for example, a radius of about 1 m from each antenna).

  The UHF transmission / reception unit 12 transmits / receives a radio signal to / from a portable device using radio waves in the UHF band (second frequency band of the present invention). As a result, a communication distance (for example, a range of about 100 m from the vehicle 101) can be obtained even if the output level of the radio wave is relatively weak.

  The LF transmission unit 11, the door antenna 16, the indoor antenna 17, the trunk internal antenna 18, and the trunk external antenna 19 correspond to the first vehicle-mounted device transmission unit of the present invention. Moreover, the UHF transmission / reception unit 12 corresponds to the second in-vehicle device transmission unit and the second in-vehicle device reception unit of the present invention.

  The engine switch 15 is a switch operated by the user when starting the engine. When the user operates the engine switch 15, the ECU 10 determines whether or not the engine can be permitted to start. When the engine can be permitted to start, the ECU 10 outputs an engine start signal to the engine control system.

  The portable devices 2 and 3 have the same configuration, and include a control unit 20, an LF reception unit 21, a UHF transmission / reception unit 22, operation buttons 24 to 26, a display device 27, a buzzer 28, a vibrator 29, and a memory 30. Machine storage unit, transmission source storage unit) and the like.

  The control unit 20 is configured as a computer including, for example, a well-known CPU and a signal input / output circuit (both not shown). Then, the CPU executes the portable device control program stored in the memory 30, thereby realizing various functions as the portable device.

  The LF receiving unit 21 receives a radio signal transmitted from the in-vehicle device 1 using an LF band radio wave. The UHF transmission / reception unit 22 transmits / receives a radio signal to / from the in-vehicle device 1 and other portable devices using UHF band radio waves. The LF receiver 21 corresponds to the first portable device receiver of the present invention. Moreover, the UHF transmission / reception unit 22 corresponds to the second portable device transmission unit and the second portable device reception unit of the present invention.

  The operation buttons 24 to 26 (operation unit of the present invention) are mainly used for a remote keyless entry (hereinafter abbreviated as “RKE”) function, and are, for example, well-known mechanical switches. For example, an RKE command for locking / unlocking the door and unlocking the trunk is transmitted from the UHF transmission / reception unit 22 according to the operation content. These operation buttons are used when shifting from the normal operation mode to the search mode. The operation buttons used for the transition may be dedicated ones, or long pressing of existing operation buttons or simultaneous pressing of a plurality of existing operation buttons may be used.

  The display device 27 is composed of, for example, a well-known LCD or electronic paper that does not require power consumption or can be minimized during display, and displays the operating state of the portable device. The buzzer 28 notifies the operation state of the portable device with sound. Vibrator 29 notifies the operating state of the portable device by vibration. The display 27, the buzzer 28, and the vibrator 29 correspond to the notification unit of the present invention.

  The memory 30 uses, for example, a nonvolatile storage medium such as a flash memory, and stores data necessary for the operation of the portable device in addition to the portable device control program. The memory 30 stores a portable device ID for identifying the portable device. Furthermore, the in-vehicle device ID and the portable device ID for identifying another portable device (in the case of FIG. 1, any of the portable devices 2 and 3) are registered. At the time of factory shipment or when a portable device is added, the registration content of the in-vehicle device 1 is received from the in-vehicle device 1 and stored in the memory 30. When the collation with the in-vehicle device 1 is normally performed, the registered content may be received.

  With the above configuration, the electronic key system 100 transmits a response request signal to the portable device via the LF transmission unit 11 from the in-vehicle device 1 in the normal operation mode. The portable device that has received the response request signal via the LF receiver 21 transmits a response signal including a portable device ID for identifying itself to the in-vehicle device 1 via the UHF transceiver 22. The ECU 10 collates the received portable device ID with the master code stored in advance in the memory 10a. When the two match and the collation is normally performed, for example, permission to lock or unlock the door, or A control signal including permission to start the engine is output to the corresponding device. This corresponds to the regulation process of the electronic key system.

  The normal process of the portable device that is included in the portable device control program of FIG. 2 and that is executed by the control unit 20 at a predetermined timing will be described. The portable device operates in either a normal state that is a normal operation state or a sleep state that consumes less power than the normal state. In the sleep state, at least the circuit that detects the operation of the operation buttons (generally referred to as 24-26, the same applies hereinafter) and the LF receiver 21 are operated. That is, it is possible to detect the presence / absence of an operation button operation (hereinafter referred to as “button operation”) and to receive LF radio waves.

  First, the presence / absence of a button operation is determined. When there is a button operation (S11: Yes), it is determined whether or not the button operation is for shifting to the search mode. When the button operation is for shifting to the search mode (S20: Yes), the normal operation mode is shifted to the search mode, and the search process (see FIG. 3) is performed. On the other hand, when the button operation is not for shifting to the search mode (S20: No), since it is an operation for using the RKE function, the provision of the RKE function such as transmitting the RKE command from the UHF transmission / reception unit 22 is performed. The process is executed (S21), and the normal state is shifted to the sleep state (S22). At this time, for example, the clock signal supplied to the CPU included in the control unit 20 is stopped.

  On the other hand, when there is no button operation (S11: No), the LF receiver 21 determines whether or not a WAKE request from the in-vehicle device 1 has been received. When the WAKE request has not been received (S12: No), the process returns to step S11. On the other hand, when the WAKE request is received (S12: Yes), the sleep state is shifted to the normal state, and the WAKE response is transmitted from the UHF transmission / reception unit 22 (S13). Subsequently, a timer T1 (for example, a 3-second timer) for waiting for reception of a response request signal is started (S14).

  Next, the LF receiver 21 determines whether or not a response request signal from the in-vehicle device 1 has been received. When the response request signal is not received (S15: No), it is determined whether or not the timer T1 has timed out. When the timer T1 has not timed out (S18: No), the process returns to step S15 to enter a response request signal reception waiting state.

  On the other hand, when the timer T1 times out (S18: Yes), the normal state is shifted to the sleep state (S19). At this time, for example, the clock signal supplied to the CPU included in the control unit 20 is stopped. Then, it returns to step S11.

  On the other hand, when the response request signal is received (S15: Yes), for example, the response process including the portable device ID is transmitted, and the electronic key system defining process is executed (S16). Next, the timer T1 is restarted (S17), and the process returns to step S15 to enter a response request signal reception waiting state.

  The search process included in the portable device control program of FIG. 3 will be described. The configuration of FIG. 3 is “when the portable device transits to the search mode, the second portable device transmission unit transmits the transmission source ID when the second portable device reception unit receives a search command from another portable device. The search response signal including the portable device ID is transmitted, and the notification unit notifies that when the second portable device reception unit receives a search response signal from another portable device. With this configuration, it is possible to search for another portable device.

  First, a timer T2 (for example, 3 to 5 seconds) for generating a search command transmission timing (corresponding to a predetermined timing of the present invention) is started (S31).

  Next, it is determined whether or not there is a button operation. When there is a button operation (S32: Yes), it is determined whether or not the operation is for ending the search mode. When the button operation is to end the search mode (S43: Yes), the search mode is shifted to the normal operation mode, and the normal process (see FIG. 2) is performed. You may transfer to the sleep state. On the other hand, when the button operation is not for ending the search mode (S43: No), since it is an operation for using the RKE function, the RKE function defining process is executed as in step S21 of FIG. (S44).

  On the other hand, when there is no button operation (S32: No), the LF receiver 21 determines whether or not the WAKE signal from the in-vehicle device 1 has been received. When the WAKE signal is not received (S33: No), it is determined whether or not the timer T2 has timed out. When the timer T2 has not timed out (S34: No), the process returns to step S32 to enter a button operation waiting state.

  On the other hand, when the timer T2 times out (S34: Yes), the timer T2 is restarted (S35). Next, a search command is transmitted from the UHF transceiver 22 (S36). Then, a search response signal (indicated as “response” in FIG. 3) is waited. When the UHF transmission / reception unit 22 does not receive data (S37: No), the process returns to step S32 and waits for a button operation.

  On the other hand, when any data is received by the UHF transmission / reception unit 22 (S37: Yes), whether the ID (transmission source ID: in-vehicle device ID or portable device ID) included in the data has been registered in the memory 30 or not. Determine. When the ID has not been registered (S38: No), the process returns to step S32 to enter a button operation waiting state.

On the other hand, when the transmission source ID is already registered (S38: Yes), the content of the data is determined. When the content of the data is a response to the search command (S39: Yes), the fact that there is a response to the search command from the in-vehicle device 1 or another portable device is notified using at least one of the following: (S42).
-A message such as “The mobile device has been detected” or “The car is near” is displayed on the display 27.
The buzzer 28 is sounded with a sound pattern corresponding to the transmission source ID.
The vibrator 29 is vibrated with a vibration pattern corresponding to the transmission source ID.
Thereafter, the process returns to step S32 to enter a button operation waiting state.

  The configuration of step S38 is “the portable device includes a transmission source storage unit that registers a transmission source ID in advance, and the notification unit includes the transmission source ID included in the search response signal received by the second portable device reception unit. Is notified when stored in the transmission source storage unit ”. With this configuration, notification is not performed when a search response signal is received from a vehicle-mounted device or portable device that is not related to the user, so that false alarms can be prevented, user convenience is impaired, and the user feels uncomfortable. You can avoid that.

  Step S42 is "The notification unit performs notification in a notification mode corresponding to the transmission source ID". With this configuration, it can be determined whether the search response signal is received from the in-vehicle device or the portable device.

  On the other hand, when the content of the data is a search command from a registered portable device (S39: No → S40: Yes), a search response signal (response) including its own portable device ID is sent from the UHF transmission / reception unit 22. Transmit (S41). Thereafter, the process returns to step S32 to enter a button operation waiting state.

  The above-described configuration is as follows: “The portable device includes a portable device storage unit that pre-registers portable device IDs of other portable devices, and the second portable device transmission unit receives the search command received by the second portable device reception unit. When the portable device ID included in is stored in the portable device storage unit, a search response signal is transmitted. With this configuration, it is possible to avoid transmitting an unnecessary search response signal and to suppress power consumption.

  If the content of the data is neither a response nor a search command (S40: No), the process returns to step S32 and enters a button operation waiting state.

  In step S33, when a WAKE signal is received (S33: Yes), a WAKE response signal is transmitted from the UHF transceiver 22 (S45), and the timer T1 is started in the same manner as in step S14 of FIG. 2 (S46). Thereafter, a response request signal reception wait state is entered.

  Next, when the response request signal is not received (S47: No), it is determined whether or not the timer T1 has timed out. When the timer T1 has not timed out (S50: No), the process returns to step S47 to enter a response request signal reception waiting state. On the other hand, when the timer T1 times out (S50: Yes), the process returns to step S32 without entering the sleep state, and enters the button operation waiting state.

  On the other hand, when the response request signal is received (S47: Yes), the above-described electronic key system defining process is executed (S48). Next, the timer T1 is restarted (S49), and the process returns to step S47 to enter a response request signal reception waiting state.

  The configuration of step S48 is “when the portable device transitions to the search mode, the first portable device receiver transmits a response signal from the second portable device transmitter when the response request signal is received”. With this configuration, the portable device and the in-vehicle device can be verified even in the search mode.

  A communication control process included in the in-vehicle device control program of FIG. 4 and executed at a predetermined timing by the ECU 10 will be described. First, the value of the counter A indicating the number of times the portable device ID is temporarily stored is cleared to zero (S71).

  Next, a timer T3 (for example, 1 second) that generates timing for transmitting the WAKE request is started (S72). When the timer T3 expires (that is, when a predetermined time has elapsed after the timer is started) (S73: Yes), a WAKE request is transmitted from the LF transmission unit 11 (S74), and a WAKE response reception waiting state is entered.

  For example, when the UHF transmission / reception unit 12 does not receive data even after a predetermined time has elapsed (S75: No), the counter A is referred to. When the value of the counter A is not zero (S87: No), the process returns to step S72, and the timer T3 is started. On the other hand, when the value of the counter A is zero (S87: Yes), the portable device ID temporarily stored in the memory 10b is deleted (S88).

  On the other hand, when the UHF transmission / reception unit 12 receives some data (S75: Yes), it determines whether the data is a WAKE response from the portable device. When it is a WAKE response (S76: Yes), a response request signal is transmitted to the portable device (S77), and a response signal reception waiting state is entered.

  For example, when the UHF transmission / reception unit 12 does not receive data even after a predetermined time has elapsed (S78: No), the process returns to step S72, and the timer T3 is started. On the other hand, when the UHF transmission / reception unit 12 receives some data (S78: Yes), it is determined whether the data is a response signal from the portable device.

  When the received data is a response signal (S79: Yes), the portable device ID included in the response signal is collated with the master data stored in the memory 10b. When the collation cannot be correctly performed (S80: No), the process returns to step S72 and the timer T3 is started. On the other hand, when the collation is correctly performed (S80: Yes), the portable device ID at this time is temporarily stored in the memory 10b (S81). At this time, according to the state of the vehicle 101, for example, a control signal including permission to lock or unlock the door or permission to start the engine is output to the corresponding device. Thereafter, the process returns to step S72, and the timer T3 is started.

  The above configuration is “the response signal includes the portable device ID, and the in-vehicle device collates the portable device ID included in the response signal with the portable device ID stored in the in-vehicle device storage unit; A temporary storage unit that stores the portable device ID of the portable device that has been correctly verified by the unit, and when the portable device ID included in the search command is stored in the temporary storage unit, the second in-vehicle device transmission unit Does not transmit a search response signal.

  The reach of the response request signal from the in-vehicle device (also referred to as a collation area) is adjusted to be about 1 m from the antenna in order to prevent unlocking only when the portable device is in the vicinity of the vehicle. . That is, being able to collate is either whether the user is in the vehicle or in the vicinity of the vehicle. It may be considered that the user does not search for a vehicle, and by transmitting an unnecessary search response signal, it is possible to avoid impairing the convenience of the user or causing the user to feel uncomfortable. Further, since an unnecessary search response signal is not transmitted, power is not wasted.

  In step S76, when the received data is not a WAKE response (S76: No), and in step S79, when the received data is not a response signal (S79: No), it is determined whether the data is a search command. To do.

  When the data is not a search command (S82: No), it is determined whether or not the data is an RKE command. When the command is not the RKE command (S89: No), the process returns to step S72, and the timer T3 is started. On the other hand, when the data is an RKE command (S89: Yes), an RKE function defining process for locking / unlocking the door in response to the RKE command is executed (S90). Thereafter, the process returns to step S72, and the timer T3 is started.

  On the other hand, when the data is a search command (S82: Yes), it is determined whether or not the portable device ID included in the search command is registered in the memory 10b. When the portable device ID is not registered (S83: No), the process returns to step S72, and the timer T3 is started. On the other hand, when the portable device ID has been registered (S83: Yes), it is determined whether or not the portable device ID is temporarily stored in the memory 10b. Note that the registration area and the temporary storage area are secured in the memory 10b as different areas.

  When the portable device ID is not temporarily stored, that is, when it is a regular portable device but is not verified (that is, the portable device does not exist in the vehicle interior or the vicinity of the vehicle) (S84: No), A search response signal (response) including its own in-vehicle device ID is transmitted from the UHF transceiver unit 12 (S85). Thereafter, a timer T4 (which generates a specified time according to the present invention) for determining whether or not a response can be transmitted is started (S86). Thereafter, the process returns to step S72, and the timer T3 is started.

  The time of the timer T4 is, for example, about twice that of the timer T2 (6 to 10 seconds). Even if the portable device exists in the vehicle interior or in the vicinity of the vehicle, radio waves from the portable device may not be received due to disturbance or the like, so at least one reception error is allowed.

  On the other hand, when the portable device ID is temporarily stored (S84: Yes), the counter A is incremented (S91). When the value of the counter A is 1, that is, when the search command from the portable device having the temporarily stored portable device ID is temporarily stored (S92: Yes), the timer T4 is started (S92: Yes). S86). Thereafter, the process returns to step S72, and the timer T3 is started.

  The above-described configuration is as follows: “When the portable device ID included in the search command is stored in the temporary storage unit, even if the matching with the portable device corresponding to the portable device ID is not correctly performed, However, when a search command is received from the portable device at a predetermined timing within a specified time, the second in-vehicle device transmission unit does not transmit a search response signal ”.

  This corresponds to a state in which the user who has the portable device leaves the vehicle while the portable device is in the search mode. In this state, since the user does not intend to search for the vehicle, it is possible to avoid losing convenience for the user or feeling uncomfortable by transmitting an unnecessary search response signal. Further, since an unnecessary search response signal is not transmitted, power is not wasted.

  On the other hand, when the value of the counter A is other than 1 (that is, 2 or more) (S92: No), it is determined whether or not the timer T4 has expired (a predetermined time has elapsed). When the timer T4 has not expired (S93: No), the process returns to step S72, and the timer T3 is started.

  On the other hand, when the timer T4 expires (S93: Yes), the portable device ID temporarily stored in the memory 10b is deleted (S94). Next, the counter A is cleared to zero (S95). Then, it progresses to step S85 and transmits a search response signal (response).

  The above-described configuration is “the in-vehicle device corresponds to the portable device stored in the temporary storage unit when the second in-vehicle device receiving unit does not receive a search command from the portable device at a predetermined timing within a specified time. It includes an erasing unit that erases the portable device ID.

  This corresponds to a state in which the user who has the portable device has moved out of the search command receivable range. In this state, collation is not performed correctly and a search command cannot be received. With the above-described configuration, the portable device is excluded from a target that does not transmit a search response signal, so that it is possible to search for a vehicle when the mobile device approaches again within the receivable range of the search command.

  A communication sequence in the configuration of the present invention will be described with reference to FIGS. Here, a situation is shown in which a user U2 is waiting for a vehicle 101 to be driven by the user U1 at a hospital.

  In FIG. 5, when the portable device 3 possessed by the user U2 is set to the search mode, a search command including a portable device ID representing the portable device 3 is transmitted (S1). When the vehicle 101 exists within the transmission range of the search command and the in-vehicle device 1 receives the search command, the search response including the in-vehicle device ID representing the in-vehicle device 1 when the portable device 3 is registered in the in-vehicle device 1 in advance. A signal (response) is transmitted (S2). When the portable device 3 receives the search response signal, when the in-vehicle device ID is registered in the portable device 3 in advance, it is notified that the vehicle 101 exists nearby (S5).

  In FIG. 5, when a search command is received from the portable device 3 when the portable device 2 that the user U1 who gets on the vehicle 101 or is in the vicinity of the vehicle 101 is in the search mode (S3), the portable device 3 Is registered in the portable device 2 in advance, a search response signal including a portable device ID representing the portable device 2 is transmitted (S4). When the portable device 3 receives the search response signal, when the portable device 2 is pre-registered in the portable device 3, it notifies that the portable device 2 exists nearby (S5).

  In FIG. 6, when the portable device 2 possessed by the user U1 is in the search mode, a search command is also transmitted from the portable device 2 (S6). When the portable device 3 in the search mode receives a search command from the portable device 2, when the portable device 2 is registered in advance in the portable device 3, a search response signal including a portable device ID representing the portable device 3 is transmitted ( S7). When the portable device 2 receives the search response signal, when the portable device 3 is pre-registered in the portable device 2, it notifies that the portable device 3 exists nearby (S8).

  In FIG. 6, the search command from the portable device 2 is also received by the in-vehicle device 1 (S9). At this time, since the user U1 is in the vehicle 101 or in the vicinity of the vehicle 101, the verification is performed between the in-vehicle device 1 and the portable device 2. Of course, since the collation result is normal, no response is transmitted from the in-vehicle device 1. Therefore, the user U1 is not notified that there is a vehicle 101 on board or in the vicinity.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

1 On-vehicle device 2, 3 Mobile device (Electronic key system mobile device)
10 ECU
10a CPU (collation unit)
10b Memory (on-vehicle device storage unit, temporary storage unit)
11 LF transmitter (first in-vehicle device transmitter)
12 UHF transmitter / receiver (second in-vehicle device transmitter, second in-vehicle device receiver)
16 Door antenna (first in-vehicle device transmitter)
17 Indoor antenna (first in-vehicle device transmitter)
18 Trunk antenna (first in-vehicle device transmitter)
19 Antenna outside trunk (first in-vehicle device transmitter)
20 control unit 21 LF receiving unit (first portable device receiving unit)
22 UHF transmitter / receiver (second portable device transmitter, second portable device receiver)
24-26 operation buttons (operation unit)
27 Display (notification part)
28 Buzzer (notification part)
29 Vibrator (notification part)
30 memory (portable device storage unit, transmission source storage unit)
100 electronic key system 101 vehicle

Claims (7)

Including an in-vehicle device mounted on a vehicle and a portable device possessed by a user;
The portable device is
A first portable device receiver that receives a predetermined response request signal using radio waves in the first frequency band from the in-vehicle device;
A second portable device transmitter for transmitting a response signal to the response request signal using a radio wave of a second frequency band different from the first frequency band;
With
The in-vehicle device is
A first in-vehicle device transmitter for transmitting the response request signal;
A second in-vehicle device receiving unit for receiving the response signal;
With
The in-vehicle device is an electronic key system that executes various controls based on the response signal,
When the portable device transitions to a search mode different from the normal operation mode,
The second portable device transmission unit transmits a search command including a portable device ID for identifying the portable device at a predetermined timing,
A second portable device receiver that receives a search response signal including a vehicle-mounted device ID for identifying the vehicle-mounted device that is a transmission source ID in response to the search command from the vehicle-mounted device;
When receiving the search response signal, a notification unit that notifies that,
Further comprising a,
The in-vehicle device is
An in-vehicle device storage unit that registers the portable device ID in advance;
A second in-vehicle device transmission unit that transmits the search response signal when a portable device ID included in the search command received by the second in-vehicle device reception unit has been stored in the in-vehicle device storage unit;
Equipped with a,
The response signal includes the portable device ID,
The in-vehicle device is
A collation unit for collating the portable device ID included in the response signal with the portable device ID stored in the in-vehicle device storage unit;
A temporary storage unit that stores the portable device ID of the portable device that has been correctly verified by the verification unit;
With
The electronic key system , wherein when the portable device ID included in the search command is stored in the temporary storage unit, the second in-vehicle device transmission unit does not transmit the search response signal . When the portable device ID included in the search command is stored in the temporary storage unit,
When the second in-vehicle device receiving unit receives a search command from the portable device at a predetermined timing within a specified time even if the matching with the portable device corresponding to the portable device ID is not correctly performed. The electronic key system according to claim 1 , wherein the second in-vehicle device transmitter does not transmit the search response signal. The in-vehicle device is
When the second in-vehicle device receiving unit does not receive a search command from the portable device at a predetermined timing within the specified time, the portable device ID corresponding to the portable device stored in the temporary storage unit is deleted. The electronic key system according to claim 2 , further comprising an erasing unit. When the portable device transitions to the search mode,
When the second portable device receiver receives the search command from another portable device, the second portable device transmitter transmits a search response signal including the portable device ID that is a transmission source ID,
The electronic key according to any one of claims 1 to 3 , wherein when the second portable device receiving unit receives a search response signal from the other portable device, the notification unit notifies the fact. system. The portable device is
A portable device storage unit that pre-registers portable device IDs of other portable devices,
Said second portable device transmitting unit, when the portable device ID, wherein the second portable device receiving unit is included in the search command received is stored in the portable device storage unit, according to claim transmits the search response signal 4 Electronic key system as described in. The portable device is
A transmission source storage unit for storing the transmission source ID in advance;
The notification unit, said second received portable device receiving unit, a source ID included in the search response signal, when it is stored in the transmission source storage unit, claims 1 performs notification claim 5 The electronic key system according to any one of the above. The electronic key system according to claim 6 , wherein the notification unit performs notification in a notification mode corresponding to the transmission source ID.

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