JP5638989B2 - Electronic key and electronic key system - Google Patents

Electronic key and electronic key system Download PDF

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JP5638989B2
JP5638989B2 JP2011061370A JP2011061370A JP5638989B2 JP 5638989 B2 JP5638989 B2 JP 5638989B2 JP 2011061370 A JP2011061370 A JP 2011061370A JP 2011061370 A JP2011061370 A JP 2011061370A JP 5638989 B2 JP5638989 B2 JP 5638989B2
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electronic key
communication
operation
vehicle
battery voltage
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JP2012197576A (en
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明暁 岩下
明暁 岩下
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株式会社東海理化電機製作所
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Description

  The present invention relates to an electronic key that enables operation of a communication target device by mutual communication with a communication target, and an electronic key that enables operation of a communication target device by mutual communication between the communication target and the electronic key. About the system.

  2. Description of the Related Art Recently, in vehicle key systems, electronic key systems that perform ID verification by wirelessly transmitting an ID code as a key code from an electronic key as a vehicle key have been adopted in various vehicle types. In this electronic key system, a request communication area is formed around the vehicle by an LF band signal as an ID code return request, and when the electronic key enters the communication area and receives the request, the electronic key transmits the ID code to the RF code. Reply to vehicle with band signal. When the vehicle receives the ID code, the vehicle performs ID verification. If the ID verification is established, the vehicle permits or executes door lock / unlock and engine start (see, for example, Patent Document 1).

  In this electronic key system, a request is periodically transmitted from the vehicle, the electronic key receives the request outside the vehicle, and the vehicle performs ID verification (verification outside the vehicle) with an ID code returned in response to the request. Run. The vehicle permits or executes door lock / unlock when the vehicle outside verification is established. In the electronic key system, the electronic key receives the ID code in the vehicle, and the vehicle performs ID verification (in-vehicle verification) with the ID code returned by the electronic key in response to the request. The vehicle permits or executes the start of the engine when the in-vehicle verification is established.

  Since the electronic key operates using a battery as a power source, when the battery voltage reaches the limit operating voltage with the passage of the use year (number of times of use), ID collation cannot be performed. As a guide, the battery can be used for over a year without replacement. Therefore, in preparation for the battery running out of the electronic key, a mechanical key is accommodated in the electronic key, and the door lock and unlocking when the battery runs out is handled by using the mechanical key. Further, the electronic key has a built-in transponder, and engine start when the battery runs out is handled by bringing the electronic key closer to the coil antenna in the vehicle and establishing ID verification (trapon verification) by the transponder.

JP 2000-185628 A

  However, even when the electronic key is equipped with a mechanical key or a transponder to take measures against running out of the battery, it is rare that the electronic key runs out of battery. For this reason, when the battery actually runs out, it can be dealt with by using a mechanical key or transponder, but the user can actually operate the vehicle even if he has an electronic key. There was a current situation where we faced a situation where we couldn't be confused by facing a situation where we couldn't. Therefore, there has been a demand for a new technique for prompting battery replacement before the electronic key runs out of battery.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electronic key that can notify the user that the electronic key is not in good condition and can ensure the convenience of the electronic key. To provide an electronic key system.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is a first communication that starts wireless communication with the vehicle triggered by communication from the vehicle, and a second communication that starts wireless communication with the vehicle triggered by communication from itself. In any electronic key that can operate the door lock and engine installed on the vehicle on condition that the ID verification is established, the voltage of the battery that supplies power is predetermined. Battery voltage determination means for determining whether or not the value is equal to or less than a value, and when the battery voltage determination means determines that the value is equal to or less than the predetermined value, the second communication remains valid, but the first communication Receiving stop means for stopping the receiving operation, operation detecting means for detecting that the operating means operated at the time of execution of the second communication is operated, and when the operation detecting means detects the operation, only for a certain period of time Reception operation of the first communication And a reception resuming means resumes, the operating means, which performs locking and unlocking operations of the door lock, the certain time is required to perform the ID verification which allows starting operation of the engine and as its gist the such a time.

According to this configuration, when the battery voltage becomes a predetermined value or less before the battery runs out, the reception operation of the first communication is stopped, so that it is possible to suppress battery consumption due to the reception operation and the electronic key. It is possible to make the user recognize that the battery is not in a good state (for example, a state in which the remaining battery level is significantly reduced). At this time, since the reception operation of the first communication is permitted for a certain period of time when the operation means is operated, for example, the first communication performed as a normal action can be executed with a time limit. Therefore, while making the user recognize that the electronic key is not in a good state, the user can operate the vehicle with a normal action without greatly impairing convenience. In addition, since the user is prompted to replace the battery, it is difficult for the electronic key to run out of battery.
In addition, when the battery voltage falls below a predetermined value, the electronic key cannot receive a wireless signal, and ID verification is not established. Therefore, the user takes out the electronic key and operates the operating means to transmit a wireless signal to lock the door lock. Unlock or lock. The electronic key restarts reception of the radio signal only for the time required for starting the engine by operating the operating means, so that ID verification is established and the engine can be started. . Therefore, it is possible to recognize that the battery is almost exhausted by manually operating the door lock, and start the engine as usual.

  According to a second aspect of the present invention, in the electronic key according to the first aspect, the reception stopping means stops the operation of an analog front end that receives a radio signal.

According to this configuration, since the operation of the analog front end, which consumes a relatively large voltage in the electronic key, is stopped, battery consumption can be efficiently suppressed .

According to a third aspect of the present invention, in the electronic key according to the first or second aspect , the battery voltage determination means uses the wireless reception or the operation means to operate the battery voltage as a trigger. The gist is to make the determination.

According to this configuration, since the battery voltage is determined when wireless reception or operation of the operation means is performed, it is possible to determine the latest battery voltage at which the electronic key itself operates.
According to a fourth aspect of the present invention, in the electronic key according to any one of the first to third aspects, the battery remaining amount is determined after a predetermined time has elapsed after getting on the vehicle or from the vehicle. The gist is that the battery voltage is detected when the transmitted battery remaining amount confirmation signal is received, and the battery voltage determination means determines the battery voltage based on the battery voltage detected before the determination.

  According to this configuration, the electronic key can perform the first communication and the second communication to detect the battery voltage in a state where the temperature is balanced and stable, and the battery exhaustion is notified based on the accurate battery voltage. It becomes possible to do.

According to a fifth aspect of the present invention, there is provided a first communication in which the vehicle and the electronic key start wireless communication in response to communication from the vehicle, and the vehicle and the electronic key in response to communication from the electronic key. In an electronic key system that allows ID verification in any of the second communications that start wireless communication, and allows operation of a door lock and an engine installed in the vehicle on condition that the ID verification is established Battery voltage determination means for determining whether or not the voltage of the battery supplying the power is equal to or lower than a predetermined value; and when the battery voltage determination means determines that the voltage is equal to or lower than the predetermined value, the second communication is enabled The reception stop means for stopping the reception operation of the first communication, the operation detection means for detecting that the operation means operated during the execution of the second communication is operated, and the operation detection means Detects operation Resuming reception resuming means receiving operation of the first communication only certain time during the, the preparation for the electronic key, the operating means, which performs locking and unlocking operations of the door lock, the predetermined time, The gist of the present invention is that it is a time required to perform the ID verification that enables the engine to be started .

According to this configuration, since the reception operation of the first communication is stopped when the battery voltage becomes equal to or lower than the predetermined value before the battery runs out, battery consumption due to the reception operation of receiving the radio signal transmitted from the vehicle is suppressed. It becomes possible. Further, it is possible to make the user recognize that the electronic key is in an unfavorable state (for example, a state in which the remaining battery level is significantly reduced). And since the reception operation | movement of 1st communication is permitted only for fixed time when an operation means is operated, for example, 1st communication performed as a normal action can be performed although there is time restriction. Therefore, while making the user recognize that the electronic key is not in a good state, the user can operate the vehicle with a normal action without greatly impairing convenience. In addition, since the user is prompted to replace the battery, it is difficult for the electronic key to run out of battery.
In addition, when the battery voltage falls below a predetermined value, the electronic key cannot receive a wireless signal, and ID verification is not established. Unlock or lock. The electronic key restarts reception of the radio signal only for the time required for starting the engine by operating the operating means, so that ID verification is established and the engine can be started. . Therefore, it is possible to recognize that the battery is almost exhausted by manually operating the door lock, and start the engine as usual.

  According to the present invention, it is possible to notify the user that the electronic key is not in a good state, and the convenience of the electronic key can be ensured.

The block diagram which shows schematic structure of an electronic key system. The figure which shows the operation | movement change by the battery voltage fall of an electronic key. The flowchart which shows the operation | movement by the battery voltage of an electronic key. The sequence chart which shows the battery voltage measurement of an electronic key system.

Hereinafter, an embodiment in which the present invention is embodied in a vehicle electronic key system will be described with reference to FIGS.
As shown in FIG. 1, the vehicle 2 includes an electronic key that can perform vehicle operations such as locking / unlocking a door lock and starting / stopping an engine without the driver actually operating the vehicle key. System 3 is installed. The electronic key system 3 uses an electronic key 1 capable of transmitting a key-specific ID code by wireless communication as a vehicle key, and executes ID collation with the vehicle 2 by narrow-area wireless communication (communication range: several meters). The vehicle 2 corresponds to a communication target. A door lock or an engine corresponds to the device.

  The electronic key system 3 includes a key operation-free system that starts bidirectional communication (smart communication) triggered by communication from the vehicle 2 and performs ID verification. This will be described below. The vehicle 2 is provided with a verification ECU (Electronic Control Unit) 21 that performs ID verification with the electronic key 1 and a main body ECU 31 that manages the locking and unlocking of the door lock and the like. Yes. The verification ECU 21 is embedded in the door of the vehicle 2 and can transmit an LF (Low Frequency) band radio signal to the outside of the passenger compartment, and is embedded in the vehicle body in the passenger compartment and wirelessly in the LF band. A vehicle interior LF transmitter 23 capable of transmitting a signal into the vehicle interior and a UHF receiver 24 embedded in a vehicle body in the vehicle interior and capable of receiving a UHF (Ultra High Frequency) band radio signal are connected. Smart communication corresponds to the first communication.

  On the other hand, the electronic key 1 is provided with a communication control unit 11 as a control unit for performing wireless communication with the vehicle 2 according to the electronic key system 3. The communication control unit 11 includes a memory 11a in which an ID code is stored as a unique key code. Connected to the communication control unit 11 is an LF reception unit 12 that can receive an externally transmitted LF band radio signal and a UHF transmission unit 14 that can transmit a UHF band radio signal in accordance with a command from the communication control unit 11. Has been.

  The verification ECU 21 intermittently transmits a request signal Srq from the outside LF transmitter 22 to attempt establishment of smart communication. The electronic key 1 receives the request signal Srq by the LF receiver 12 and establishes smart communication. In response to the request signal Srq, the electronic key 1 includes an ID code signal Sid including the ID code registered in its own memory 11a. Is returned from the UHF transmitter 14. The verification ECU 21 compares the ID code of the ID code signal Sid returned by the electronic key 1 with the ID code registered in its own memory 21a, and confirms that this ID verification is established. Assuming that the key 1 is located outside the passenger compartment, processing is performed as the vehicle exterior verification is established.

  When the verification ECU 21 confirms that the vehicle exterior verification is established, the verification ECU 21 permits the locking and unlocking of the door lock. In this permitted state, when the lock sensor 25 is touched, the verification ECU 21 causes the main body ECU 31 to drive the door lock device 34 to lock the door lock. On the other hand, when the unlock sensor 26 is touch-operated, the verification ECU 21 causes the main body ECU 31 to drive the door lock device 34 to unlock the door lock. That is, the door lock is unlocked simply by holding the electronic key 1 and approaching the vehicle 2 and touching the unlock sensor 26.

  Here, when the user gets off the vehicle 2, the verification ECU 21 intermittently receives the request signal Srq from the LF transmitter 22 outside the vehicle, triggered by the touch operation of the lock sensor 25 or the unlock sensor 26. Try to establish smart communication.

  In addition, the vehicle 2 is provided with an engine ECU 32 that performs engine ignition control and fuel injection control based on the ID verification establishment result of the verification ECU 21. The engine ECU 32 is connected to various ECUs such as the verification ECU 21 through the in-vehicle LAN 30. The driver's seat of the vehicle 2 is provided with an engine switch 33 that is operated when switching the power supply state (power supply position) of the vehicle 2. The engine switch 33 is connected to the verification ECU 21.

  When the engine switch 33 is pushed, the verification ECU 21 transmits a request signal Srq from the vehicle interior LF transmitter 23 to execute ID verification in the vehicle interior. When it is confirmed that the ID verification is established, the verification ECU 21 determines that the electronic key 1 is located in the vehicle interior and processes the vehicle interior verification as being established.

  The verification ECU 21 permits the operation of the engine switch 33 when it is confirmed that the vehicle interior verification is established. When the electronic key 1 is present in the passenger compartment, the verification ECU 21 repeatedly changes the power state in the order of ACC on → IG on → power off every time the engine switch 33 is pressed. In addition, when the electronic key 1 is present in the vehicle interior, the verification ECU 21 causes the engine ECU 32 to start the engine when the engine switch 33 is operated while the brake pedal is depressed when the engine is stopped.

  Further, the vehicle 2 is provided with a wireless key system that performs ID collation by unidirectional communication (wireless communication) triggered by communication from the electronic key 1. The electronic key 1 is provided with an unlock button 15 for unlocking the door lock of the push button type vehicle 2 and a lock button 16 for locking the door lock. The unlock button 15 and the lock button 16 are connected to the communication control unit 11. Note that the unlock button 15 and the lock button 16 correspond to operation means. Wireless communication corresponds to second communication.

  When the unlock button 15 is operated, the communication control unit 11 transmits an unlock signal Sul including a unique ID code and unlock operation information from the UHF transmission unit 14. When the verification ECU 21 receives the unlock signal Sul including the unlock information of the door lock by the UHF receiver 24, the verification ECU 21 compares the ID code registered in its own memory 21a with the ID code of the unlock signal Sul. Perform (wireless verification). And if collation ECU21 confirms ID collation establishment, it will output the unlocking command of a door lock to the door lock apparatus 34, and will unlock a door lock.

  Further, when the locking button 16 is operated, the communication control unit 11 transmits a locking signal Sl including a unique ID code and unlocking operation information from the UHF transmission unit 14. When the UHF receiver 24 receives the locking signal Sl including the door lock locking information, the verification ECU 21 compares the ID code registered in its own memory 21a with the ID code of the locking signal Sl (wireless verification). )I do. And if collation ECU21 confirms ID collation establishment, it will output the door lock locking command to the door lock apparatus 34, and will lock a door lock.

  As shown in FIG. 2, the electronic key 1 according to the present embodiment is provided with a notification function for notifying that the battery is almost exhausted when the voltage of its own battery 17 falls below a predetermined value. That is, in the so-called non-operating area where the battery voltage of the electronic key 1 is equal to or lower than the operation stop voltage, the electronic key 1 is inoperative. In the notification area where the battery voltage of the electronic key 1 is higher than the operation stop voltage and is not more than the notification voltage notifying the user that the battery is almost exhausted, the electronic key 1 stops the reception function. The electronic key 1 cannot perform normal smart communication by stopping the reception function.

  Specifically, the communication control unit 11 of the electronic key 1 includes a battery voltage determination unit 11b that determines whether or not the voltage of the battery 17 is equal to or lower than a predetermined value, and an analog front end (AFE) provided in the LF reception unit 12. An AFE operation control unit 11c that controls the operation of (Analog Front End) 13, a button operation detection unit 11 d that detects button operations, and a timer 11 e that counts time are provided. In addition, the battery voltage determination part 11b functions as a battery voltage determination means. The AFE operation control unit 11c functions as a reception stop unit and a reception restart unit. Further, the button operation detection unit 11d functions as an operation detection unit.

  The battery voltage determination unit 11b compares the notification voltage with the current battery voltage to determine whether the current battery voltage is equal to or lower than the notification voltage. Further, when the current battery voltage is equal to or lower than the notification voltage, the battery voltage determination unit 11b compares the inoperative voltage with the current battery voltage to determine whether the current battery voltage is equal to or lower than the inoperative voltage. Determine whether.

  The AFE operation control unit 11c turns off the power of the AFE 13 when the battery voltage determination unit 11b determines that the battery voltage is higher than the non-operation voltage and equal to or lower than the notification voltage. That is, the electronic key 1 stops the radio communication standby for smart communication. Even when the power of the AFE 13 is turned off, the wireless communication function in the communication control unit 11 is turned on, so that wireless communication can be executed without any problem. Then, when the button operation detection unit 11d detects a button operation, the AFE operation control unit 11c turns on the AFE 13 for a predetermined time T with the power of the AFE 13 as a fixed time. Note that the predetermined time T corresponds to a time from when the door lock is unlocked by a button operation to get into the vehicle 2 to establish vehicle interior verification.

Next, the operation when the battery voltage of the electronic key 1 decreases will be described with reference to FIG.
First, when the electronic key 1 receives the request signal Srq or when the buttons 15 and 16 are operated, the AFE 13 is stopped because the battery voltage is determined to be equal to or lower than the notification voltage. . For this reason, even if the user approaches the vehicle 2, the electronic key 1 does not receive the request signal Srq transmitted from the vehicle 2, so that smart communication is not established and the door lock cannot be unlocked. . Then, the user takes out the electronic key 1 from a pocket or the like and operates the unlock button 15. That is, a wireless operation is performed on the electronic key 1.

  As illustrated in FIG. 3, the communication control unit 11 starts a communication operation when a wireless operation is performed. That is, the button operation detection unit 11d detects an operation on the unlock button 15 or the lock button 16, and causes the battery voltage determination unit 11b to determine the battery voltage. The battery voltage determination unit 11b determines whether or not the battery voltage is equal to or lower than the notification voltage (step S1). If the battery voltage is greater than the notification voltage (step S1: NO), the communication control unit 11 activates the AFE 13 assuming that the battery 17 has been replaced (step S6). That is, the AFE operation control unit 11 c turns on the power of the AFE 13. That is, the normal mode is restored and the request signal Srq can be received.

  On the other hand, when the battery voltage is equal to or lower than the notification voltage (step S1: YES), the communication control unit 11 determines whether or not the battery voltage is greater than the inoperative voltage (step S2). If the battery voltage is smaller than the inoperative voltage (step S2: NO), the communication control unit 11 sets the battery to run out of operation (step S7). That is, the communication control unit 11 stops the operation of the electronic key 1 itself.

  On the other hand, when the battery voltage is higher than the non-operation voltage (step S2: YES), the communication control unit 11 activates the AFE 13 only for a predetermined time (step S3). That is, the AFE operation control unit 11 c turns on the power of the AFE 13. And the communication control part 11 determines whether predetermined time T passed (step S4). The predetermined time T is counted by the timer 11e.

  Here, when the battery voltage is greater than the inoperative voltage (step S2: YES), the communication control unit 11 activates the AFE 13 and sends an unlock signal Sul in response to an operation on the unlock button 15 via UHF. Transmit from unit 14. When the collation ECU 21 receives the unlock signal Sul by the UHF receiver 24 and wireless collation is established, the collation ECU 21 causes the door lock device 34 to unlock the door lock. The user opens the door and gets into the vehicle interior. At this time, the verification ECU 21 transmits a request signal Srq to the passenger compartment when the user gets in. Since the AFE 13 of the electronic key 1 is temporarily activated, the request signal Srq is received. Then, the electronic key 1 returns an ID code signal Sid in response to the request signal Srq. Thus, the verification ECU 21 performs vehicle interior verification, and permits the engine start operation because vehicle interior verification is established. Therefore, the user can start the engine by operating the engine switch 33.

When the predetermined time T has elapsed, the communication control unit 11 stops the AFE 13 (step S5). That is, the AFE operation control unit 11c turns off the power of the AFE 13.
In this embodiment, when the battery voltage of the electronic key 1 becomes equal to or lower than the notification voltage, the AFE 13 is stopped and the request signal Srq from the vehicle 2 cannot be received, so that smart communication cannot be performed. For this reason, the user operates the unlock button 15 (lock button 16) to unlock the door lock, and notices that the electronic key 1 is different from usual. Further, when the unlocking button 15 (locking button 16) is operated, the electronic key 1 can activate the AFE 13 for a predetermined time T, and the vehicle interior verification can be established as usual. For this reason, it is not necessary to reduce the convenience in starting the engine. Therefore, the battery can be replaced by recognizing the abnormality of the electronic key 1.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) When the battery voltage becomes equal to or lower than the notification voltage before the battery runs out, reception of the radio signal is stopped, so that consumption of the battery 17 due to the reception operation can be suppressed, and the electronic key 1 can be used normally by the user. It can be recognized that ID verification by smart communication outside the vehicle cannot be performed. Then, when the unlock button 15 or the lock button 16 is operated, the reception of the radio signal is resumed only for a predetermined time T, so that the user recognizes that the electronic key 1 is not in a good state and performs normal smart communication in the vehicle. Therefore, convenience can be maintained. Therefore, by letting the user recognize the abnormality of the electronic key 1, it is possible to prompt the user to replace the battery before the battery runs out.

(2) Since the operation of the analog front end 13 having a relatively large voltage consumption in the electronic key 1 is stopped, the consumption of the battery 17 can be efficiently suppressed.
(3) When the battery voltage becomes equal to or lower than the notification voltage, the electronic key 1 cannot receive a radio signal and ID verification is not established. Therefore, the user inevitably takes out the electronic key 1 and operates the unlock button 15 or the lock button 16. Thus, a radio signal is transmitted to unlock or lock the door lock. The electronic key 1 resumes reception of the radio signal only for the time required to start the engine by operating the unlock button 15 or the lock button 16, so that ID verification is established, The engine can be started. Therefore, by manually operating the door lock, it can be recognized that the battery is almost exhausted, and the engine can be started normally by smart communication.

  (4) Since the battery voltage is determined when the request signal Srq is received or the unlock button 15 or the lock button 16 is operated, it is possible to determine the latest battery voltage at which the electronic key 1 itself operates. it can.

  (5) Since the smart communication is not established even when the user approaches the vehicle 2, the door lock cannot be unlocked even if the unlock sensor 26 is touched, and the electronic key 1 is taken out and the unlock button 15 is pressed. The door lock can be unlocked by operation. When the door is opened and the passenger enters the vehicle compartment, smart communication is established as usual, and the engine can be started by operating the engine switch 33. In other words, smart communication is not possible outside the vehicle compartment, and smart communication is established in the vehicle interior when the door lock is unlocked by wireless communication and the vehicle interior is entered. Therefore, since it is such a characteristic state (symptom), it can be easily recognized that the battery of the electronic key 1 is almost exhausted by a dealer or the like.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the battery voltage of the electronic key 1 may be detected on the condition that a predetermined time has elapsed since the user got on the vehicle or a battery remaining amount determination signal has been received. For example, the battery voltage of the electronic key 1 may be detected after a predetermined time has elapsed since the start of the engine. That is, as shown in FIG. 4, when the engine is started (step S11), the vehicle 2 checks whether or not a predetermined time has elapsed from the engine start, and when the predetermined time has elapsed (step S12). Then, a battery remaining amount determination command signal is transmitted from the vehicle interior LF transmitter 23 (step S13). When the electronic key 1 receives the battery remaining amount determination command signal transmitted from the vehicle 2 by the LF receiver 12, the electronic key 1 detects the battery voltage (step S14). Then, the electronic key 1 determines the remaining battery level from the detected battery voltage (step S15), and stores the battery voltage as the remaining battery level in the memory 11a of the communication control unit 11 (step S16). In this way, the electronic key 1 can perform wireless communication or smart communication to detect the battery voltage in a stable state with the temperature balanced and to notify the battery exhaustion based on the accurate battery voltage. Can do.

  In the above embodiment, the battery voltage is determined when the request signal Srq is received or the unlock button 15 or the lock button 16 is operated. However, the battery voltage may be determined as needed.

  In the above embodiment, the AFE 13 is stopped (power off) in order to stop the reception of the radio signal, but the reception itself may be stopped, for example. That is, the process accompanying reception of the radio signal is stopped.

  In the above embodiment, the frequency of the radio signal used in the electronic key system 3 is not necessarily limited to LF or UHF, and other frequencies can be used. Further, the frequency when the wireless signal is transmitted from the vehicle 2 to the electronic key 1 and the frequency when the wireless signal is returned from the electronic key 1 to the vehicle 2 are not necessarily limited to different ones. Also good.

In the above configuration, the positions of the LF transmitters 22 and 23 can be arbitrarily changed.
In the above configuration, the quantity of the LF transmitters 22 and 23 can be arbitrarily changed.
In the above embodiment, the lock sensor 25 and the unlock sensor 26 corresponding to the locking and unlocking of the door lock are provided. However, only one sensor is provided and locked and unlocked each time it is operated. Also good.

  -In above-mentioned embodiment, 1st communication is not limited to smart communication, For example, near field communication may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Electronic key, 2 ... Vehicle, 3 ... Electronic key system, 11 ... Communication control part, 11a ... Memory, 11b ... Battery voltage determination part as battery voltage determination means, 11c ... AFE as reception stop means and reception resumption means Operation control unit, 11d ... button operation detection unit as operation detection means, 11e ... timer, 12 ... LF reception unit, 13 ... analog front end (AFE), 14 ... UHF transmission unit, 15 ... unlocking button as operation means , 16 ... Locking button as operating means, 17 ... Battery, 21 ... Verification ECU, 22 ... Outside LF transmitter, 23 ... LF transmitter in vehicle, 24 ... UHF receiver, 30 ... LAN in vehicle, 31 ... Main body ECU, 32 ... Engine ECU, 33 ... Engine switch, 34 ... Door lock device, Sid ... ID code signal, Sl ... Lock signal, Srq ... Request Nos., Sul ... unlock signal.

Claims (5)

  1. ID verification is possible in either the first communication that starts wireless communication with the vehicle triggered by communication from the vehicle or the second communication that starts wireless communication with the vehicle triggered by communication from itself. Yes, in the electronic key that enables operation of the door lock and engine installed in the vehicle on condition that the ID verification is established,
    Battery voltage determination means for determining whether or not the voltage of the battery supplying the power is a predetermined value or less
    A reception stop means for stopping the reception operation of the first communication even if the second communication remains valid when the battery voltage determination means determines that the battery voltage determination means is less than or equal to the predetermined value;
    Operation detecting means for detecting that an operating means operated at the time of executing the second communication is operated;
    Receiving restarting means for restarting the receiving operation of the first communication only for a predetermined time when the operation detecting means detects an operation ;
    The operation means performs a locking / unlocking operation of the door lock,
    The electronic key according to claim 1, wherein the predetermined time is a time required for performing the ID collation that enables the engine to be started .
  2. The electronic key according to claim 1, wherein
    The electronic key characterized in that the reception stop means stops the operation of an analog front end that receives a radio signal.
  3. The electronic key according to claim 1 or 2 ,
    The electronic key according to claim 1, wherein the battery voltage determination means determines the battery voltage triggered by the wireless reception or the operation of the operation means.
  4. In the electronic key as described in any one of Claims 1-3 ,
    When a predetermined time has elapsed after getting on the vehicle, or when a battery remaining amount determination signal transmitted to determine the remaining battery amount is received from the vehicle, the battery voltage is detected,
    The electronic key according to claim 1, wherein the battery voltage determining means determines the battery voltage based on the battery voltage detected before the determination.
  5. A first communication in which the vehicle and the electronic key start wireless communication triggered by communication from the vehicle; and a second communication in which the vehicle and the electronic key start wireless communication triggered by communication from the electronic key. In an electronic key system that allows ID verification in any of the above, and enables door lock and engine operation installed in the vehicle on condition that the ID verification is established,
    Battery voltage determination means for determining whether or not the voltage of the battery supplying the power is a predetermined value or less;
    A reception stop means for stopping the reception operation of the first communication even if the second communication remains valid when the battery voltage determination means determines that the battery voltage determination means is less than or equal to the predetermined value;
    Operation detecting means for detecting that an operating means operated at the time of executing the second communication is operated;
    A reception restarting means for restarting the reception operation of the first communication only for a predetermined time when the operation detection means detects an operation ;
    The operation means performs a locking / unlocking operation of the door lock,
    The electronic key system according to claim 1, wherein the predetermined time is a time required for performing the ID collation that enables the engine to be started .
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JP2011061370A JP5638989B2 (en) 2011-03-18 2011-03-18 Electronic key and electronic key system

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Application Number Priority Date Filing Date Title
JP2011061370A JP5638989B2 (en) 2011-03-18 2011-03-18 Electronic key and electronic key system

Publications (2)

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JP2012197576A JP2012197576A (en) 2012-10-18
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