JP6356529B2 - Electronic key and electronic key system - Google Patents

Description

  The present invention relates to an electronic key and an electronic key system.

  In the conventional electronic key system, locking / unlocking of the vehicle door, engine starting, etc. are permitted through wireless communication between the electronic key and the vehicle-mounted device. The in-vehicle device transmits a request signal around the vehicle. When receiving the request signal, the electronic key transmits a response signal including the ID code. The vehicle-mounted device permits locking / unlocking of the vehicle door when collation of the ID code included in the response signal from the electronic key is established (see, for example, Patent Document 1).

JP 2002-029385 A

In recent years, there has been concern about unauthorized communication in which an electronic key that exists far away using a repeater that relays radio waves (request signal, response signal) is disguised as if it exists outside the vehicle interior. Unauthorized communication using this repeater may cause unauthorized unlocking of vehicle doors. For this reason, security technology against unauthorized communication using a repeater has been demanded.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electronic key and an electronic key system with improved security.

  In order to solve the above-mentioned problem, a magnetic sensor for detecting magnetism in at least three axial directions in an electronic key including an electronic key control unit that enables operation of an in-vehicle device by performing wireless communication with the in-vehicle device. The electronic key control unit determines whether or not the electronic key is in a stationary state by analyzing the detection result of the magnetic sensor in time series, and if it is determined that the electronic key is in a stationary state, The main point is not to perform wireless communication with the machine.

  A legitimate user operates the in-vehicle device by approaching the vehicle while touching or operating a specific part of the vehicle while holding the electronic key. That is, when the user tries to operate the in-vehicle device, the direction of the electronic key possessed by the moving user changes in time series. In other words, if the direction of the electronic key does not change, the user is not trying to operate the in-vehicle device.

  According to this configuration, the electronic key control unit can detect a change in the direction of the electronic key based on the detection result of the magnetic sensor. The electronic key control unit does not perform wireless communication with the in-vehicle device when the electronic key is in a stationary state, that is, in a state where there is no change in the direction of the electronic key. Therefore, even if a third party illegally relays a wireless signal from a vehicle using a repeater to an electronic key stored in a storage location such as a house, the electronic key Do not respond. That is, wireless communication between the in-vehicle device and the electronic key is not established. For this reason, since in-vehicle equipment is not used by a third party, security is good.

In the above configuration, the magnetic sensor preferably detects magnetism intermittently.
According to this configuration, power consumption in the magnetic sensor is suppressed. Usually, since the electronic key is driven by a battery, the function of the electronic key can be used for a long time by suppressing power consumption in the magnetic sensor.

  In the above configuration, the detection interval of the magnetic sensor is shorter when the electronic key control unit determines that the electronic key is in a non-stationary state than when it is determined that the electronic key is in a stationary state. It is preferable.

  Since the electronic key stored in the storage location is in a stationary state, if the detection interval of the magnetic sensor in this state is short, a large amount of power is wasted. In this respect, according to this configuration, if the stationary state is set, the detection interval of the magnetic sensor becomes longer than that in the non-stationary state, so that useless power consumption in the magnetic sensor is suppressed.

  In the above configuration, the electronic key control unit determines that the electronic key is in a stationary state when a change in the detection result of the magnetic sensor over a plurality of times is included in a preset tolerance range. It is preferable to determine that the electronic key is in a non-stationary state when the change in the detection result is not included in the tolerance range.

According to this configuration, when it is judged that the electronic key control unit there is a change in orientation of the electronic key through either Luke not included in the scope variation tolerance of the detection results over a plurality of times of the magnetic sensor, the magnetic sensor immediately Therefore, it is possible to prevent the electronic key from being determined to be in a stationary state. Therefore, a legitimate user can easily use the electronic key.

  In the above configuration, the electronic key control unit acquires information indicating a position of the vehicle through the wireless communication, and the electronic key is in a non-stationary state while the vehicle is located at a preset registration position. When the state determined to be present continues for a preset time, it is preferable to process the electronic key as being in a stationary state.

  For example, when a vehicle is parked at a station or airport parking lot in order to use a train or an airplane, it is expected that the user moves a long distance, that is, the non-stationary state of the electronic key continues for a long time. In other words, it is expected that the time during which wireless communication can be performed between the in-vehicle device and the electronic key, that is, the time during which unauthorized communication using a repeater by a third party can be performed continues for a long time.

  Therefore, according to this configuration, when the vehicle is located at a registered position such as a parking lot at a station or an airport and the state where the electronic key is determined to be in a non-stationary state continues for a set time, the electronic The key control unit performs processing assuming that the electronic key is in a stationary state. Thereby, an electronic key control part does not perform radio | wireless communication between vehicle equipment. Therefore, since unauthorized communication using a repeater by a third party cannot be performed, security is good.

  In the above configuration, a gravity sensor that detects acceleration in the direction of gravity is provided, and the electronic key control unit electronically analyzes the detection result of the gravity sensor in addition to the time series analysis of the detection result of the magnetic sensor. It is preferable to determine whether the key is in a stationary state.

  Gravity applied to the electronic key possessed by the moving user changes in time series. According to this configuration, the electronic key control unit does not generate a response signal even if it receives a request signal when there is no change in the direction of gravity in addition to no change in the direction of the electronic key. For this reason, higher security can be obtained.

  In order to solve the above-described problem, an electronic key that wirelessly communicates with an in-vehicle device is provided, and the in-vehicle device enables operation of the in-vehicle device when wireless communication is established with the electronic key. In the system, the electronic key includes a magnetic sensor that detects magnetism in at least three axial directions, and an electronic key control unit that wirelessly transmits information indicating a detection result of the magnetic sensor to the in-vehicle device. Determines whether there is a change in the direction of the electronic key based on the received information indicating the detection result of the magnetic sensor, and if it is determined that there is a change in the direction of the electronic key, It is preferable to include an in-vehicle control unit that enables the above.

According to this system, since the vehicle equipment can not be used unless it is determined that in addition to collation of the identification code is established there is a change in orientation of the electronic key, the vehicle-mounted devices are used by a third party difficult. For this reason, this system has good security.

  The electronic key and electronic key system of the present invention have good security.

The block diagram which shows schematic structure of an electronic key system. The perspective view of the electronic key in which a geomagnetic sensor is mounted. The time chart which shows the process of an electronic key control part. The time chart which shows the process of the electronic key control part in another example.

Hereinafter, an embodiment of an electronic key system will be described with reference to the drawings.
As shown in FIG. 1, the electronic key system 1 performs various vehicle controls through wireless communication between the vehicle 10 and the electronic key 20.

  The electronic key 20 includes an electronic key control unit 21, an LF reception unit 22, a UHF transmission unit 23, a geomagnetic sensor 24, and a gravity sensor 25. Among these, each part except the electronic key control part 21 is electrically connected to the electronic key control part 21, respectively, and is comprehensively controlled by the electronic key control part 21. Each unit of the electronic key 20 is driven by consuming driving power supplied from a battery (not shown).

The LF receiver 22 receives a radio signal in the LF (Low Frequency) band and demodulates the received signal into an electrical signal.
UHF transmitter 23, an electrical signal with modulating the UHF (Ultra Hi gh Frequency) band, and transmits the modulated radio signal.

The geomagnetic sensor 24 detects the intensity of geomagnetism in three directions intermittently. As shown in FIG. 2, the geomagnetic sensor 24 detects the strength of geomagnetism in the vertical direction, horizontal direction, and thickness direction of the electronic key 20. Here, as shown in FIG. 2, the vertical direction is the Z direction, the horizontal direction is the Y direction, and the thickness direction is the X direction, and the geomagnetic sensor 24 measures the strength of the geomagnetism in each direction. Note that the geomagnetic sensor 24, a first detection interval when in the non-stationary state electronic key 20 will be described later, the interval longer than the first detection interval when the electronic key 20 is in a constant stationary state you later the The intensity of geomagnetism is detected at each detection interval of 2. For example, the first detection interval is set to 1 second interval, and the second detection interval is set to 10 second interval.

An ID code (corresponding to an identification code) common to the vehicle 10 is stored in the memory 21 a of the electronic key control unit 21. In addition, the detection result of the geomagnetic sensor 24 is stored in the memory 21a.
Whenever the geomagnetic sensor 24 detects the strength of the geomagnetism, the electronic key control unit 21 compares the detection result with the previous detection result stored in the memory 21a, and the electronic key 20 is not moving (hereinafter referred to as the electronic key 20). , A stationary state) or a moving state (hereinafter, non-stationary state), and the detection result of the memory 21a is updated.

  When the electronic key control unit 21 is in a non-stationary state and receives a request signal to be described later through the LF reception unit 22, the electronic key control unit 21 generates a response signal including the ID code stored in the memory 21a. The generated response signal is modulated by the UHF transmitter 23 and then wirelessly transmitted. The electronic key control unit 21 does not generate a response signal even if it receives a request signal in a stationary state.

<Vehicle>
As shown in FIG. 1, the vehicle 10 includes an in-vehicle controller 11, an LF transmitter 12, a UHF receiver 13, a door handle sensor 14, and a door lock device 15. Among these, each part except the vehicle-mounted control part 11 is each electrically connected with the vehicle-mounted control part 11, and is generally controlled by the said vehicle-mounted control part 11. Note that the in-vehicle control unit 11, the LF transmission unit 12, and the UHF reception unit 13 correspond to the in-vehicle device 19.

The LF transmission unit 12 modulates an electrical signal into an LF band radio signal and transmits the modulated radio signal.
The UHF receiving unit 13 receives a UHF band radio signal and demodulates the received signal into an electrical signal.

The door handle sensor 14 detects contact with the door handle.
The door lock device 15 switches between locking and unlocking the vehicle door.
An ID code common to the electronic key 20 is stored in the memory 11 a of the in-vehicle control unit 11.

  The in-vehicle control unit 11 periodically generates a request signal including information requesting transmission of the ID code. The request signal is modulated by the LF transmitter 12 and wirelessly transmitted.

  When the in-vehicle controller 11 receives a response signal as a response to the request signal through the UHF receiver 13, the in-vehicle controller 11 collates the ID code included in the response signal with the ID code stored in the memory 11a. When the verification is established, the in-vehicle control unit 11 permits switching between locking and unlocking the vehicle door. In this state, when contact with the door handle is detected through the door handle sensor 14, the in-vehicle control unit 11 switches between locking and unlocking the vehicle door through the door lock device 15.

<Action>
Next, the operation of the electronic key system 1 will be described with reference to FIG. The user who holds the electronic key 20 contacts the door handle to switch the vehicle door from unlocked to locked, and then leaves the vehicle and returns home, stores the electronic key 20, and then uses the vehicle 10 again. Therefore, a description will be given assuming that the electronic key 20 is possessed. Here, the strength of the geomagnetism in each of the X, Y, and Z directions detected by the geomagnetic sensor 24 shown in FIG. 3 is shown as an example.

As shown in FIG. 3, after the vehicle door is locked (timing T <b> 0), since the user is moving while the user is moving from the vehicle toward the home, the electronic key 20 possessed by the user is also moved. Therefore, the detection result of the geomagnetic sensor 24 also changes at every detection (timing T1, T2, T3).
Thereafter, when the user returns home and stores the electronic key 20 in the storage location (timing T4), the electronic key 20 does not move thereafter (timing T5). Here, since the detection result of the geomagnetic sensor 24 at the timing T5 is the same as the detection result of the previous time (here, the timing T4), the electronic key control unit 21 changes the electronic key 20 from the non-stationary state to the stationary state. Judge that it has migrated. Thereby, the geomagnetic sensor 24 after the timing T5 detects the strength of the geomagnetism at the second detection interval (timing T7, T8).

  Thereafter, when the user possesses the electronic key 20 from the storage location in order to use the vehicle 10 again (between timing T7 and timing T8), the electronic key control unit 21 detects the detection result of the geomagnetic sensor 24 and the previous time (here, Since the detection result at timing T7) is different, it is determined that the electronic key 20 has shifted from the stationary state to the non-stationary state. Thereby, the geomagnetic sensor 24 after timing T8 detects the strength of geomagnetism at the first detection interval (timing T9, T10).

  The electronic key control unit 21 does not generate a response signal even if it receives a request signal while it is determined that the electronic key 20 is in a stationary state (here, timings T5 to T8). That is, even if a third party causes the electronic key 20 to receive a request signal that is illegally wirelessly transmitted from the vehicle 10 using a repeater, the vehicle 10 cannot receive a response signal to the request signal. Thereby, security is ensured. During this time, since the measurement interval of the geomagnetism intensity in the geomagnetic sensor 24 is also the second detection interval, power consumption in the electronic key 20 is suppressed.

  Further, the electronic key control unit 21 requests the request signal while it is determined that the electronic key 20 is in a non-stationary state (here, from the time when the electronic key 20 is verified until the timing T5 is reached, and after the timing T8). When a signal is received, a response signal is generated. Therefore, the user can hold the electronic key 20 and switch between locking and unlocking the vehicle door immediately after getting off the vehicle 10 or when using the vehicle 10.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) When the previous value and the current value of the detection result of the geomagnetic sensor 24 are compared to determine whether the electronic key 20 is in a stationary state or a non-stationary state, and when it is determined that the electronic key 20 is in a stationary state The electronic key control unit 21 is configured not to generate a response signal even if a request signal from the vehicle 10 is received. Thus, even if a third party illegally relays a request signal from the vehicle 10 to the electronic key 20 stored in a storage place such as a house by using a repeater, the electronic key 20 (electronic key control) The unit 21) does not generate a response signal. For this reason, since the third person cannot switch between locking and unlocking the vehicle door, the security is good.

(2) The geomagnetic sensor 24 is configured to detect the strength of geomagnetism intermittently. Thereby, the power consumption in the geomagnetic sensor 24 is suppressed. As a result, the function of the electronic key 20 can be used for a long time.

(3) When the electronic key control unit 21 determines that the electronic key 20 is in the non-stationary state, the geomagnetic sensor 24 determines that the electronic key 20 is in the stationary state at the first detection interval. Is configured to detect the strength of geomagnetism at a second detection interval that is longer than the first detection interval. Stationary state, the state stored in the storage location, i.e., the user is in a state without a vehicle 10, the detection interval of the detection interval of the geomagnetic sensor 24 in the state in the non-stationary conditions that may vehicle 10 is used By making the length longer, power consumption in the geomagnetic sensor 24 is suppressed.

In addition, you may change the said embodiment as follows.
In the above embodiment, as shown in FIG. 1, the electronic key 20 preferably includes a gravity sensor 25 that detects a change in acceleration in the gravity direction. The electronic key control unit 21 determines whether the electronic key 20 is in a stationary state or a non-stationary state by analyzing the detection result of the gravity sensor 25 in addition to the time series analysis of the geomagnetic sensor 24. It is preferable to do. If the time series analysis of the detection result of the gravity sensor 25 is added, for example, even when the user simply moves in the north-south direction and the geomagnetic direction does not change, the electronic key 20 Is easily determined to be in a non-stationary state.

It should be noted that the one-chip sensor in which the three-axis geomagnetic sensor and the gravity sensor are integrated can be used for the electronic key 20.
In the above embodiment, the electronic key control unit 21 determines whether the electronic key 20 is in a stationary state or a non-stationary state by analyzing the detection result of the geomagnetic sensor 24 in time series. If the electronic key 20 is located at a specific position, it may be processed that the electronic key 20 is in a stationary state regardless of the result of time series analysis of the detection result of the geomagnetic sensor 24.

As shown by a broken line in FIG. 1, the vehicle 10 includes a GPS sensor 16 that measures the position of the vehicle 10 by receiving radio waves from GPS satellites. In addition, the memory 11a, the position information of the parking lot of transportation such as electric cars and airplanes are stored in advance. The position indicated by the position information corresponds to the registered position .

  When the position of the vehicle 10 measured by the GPS sensor 16 corresponds to the position of the parking lot of the transportation facility stored in the memory 11a, the in-vehicle control unit 11 wirelessly transmits information indicating that. This wireless transmission may be performed by including information indicating the position of the vehicle 10 in the request signal, or transmitting the information indicating the position of the vehicle 10 in a signal different from the request signal. It may be a thing. The information indicating the position of the vehicle 10 is preferably transmitted with at least a vehicle door being switched from unlocked to locked (timing T0). When the vehicle door is switched from unlocked to locked, there is a high possibility that there is a user holding the electronic key 20 in the vicinity of the vehicle 10, and the electronic key control unit 21 can acquire information indicating the position of the vehicle 10. It is because the nature is high.

  When the position of the vehicle 10 corresponds to the position of a parking lot for transportation through reception of a radio signal, the electronic key control unit 21 determines that the electronic key 20 is not in accordance with the result of time series analysis of the detection result of the geomagnetic sensor 24. When the state determined to be in the stationary state continues for a set time (for example, 1 minute), the electronic key 20 is processed as being in the stationary state as shown in FIG.

When the vehicle 10 is parked at a station or airport parking lot in order to use a train or an airplane, and the user moves a long distance, in the configuration of the above embodiment, the non-stationary state of the electronic key 20 continues for a long time. For this reason, it is expected that the time during which wireless communication between the in-vehicle device 19 and the electronic key 20 can be performed, that is, the time during which unauthorized communication using a repeater can be performed continues for a long time.

  In this regard, according to this another example, when the vehicle 10 is located in a parking lot for transportation, if the state in which the electronic key 20 is determined to be in the non-stationary state exceeds the set time, the electronic key 20 is stationary. Treat as in state. Thereby, as shown in FIG. 4, even if the electronic key control unit 21 receives the request signal, it does not generate a response signal. That is, the electronic key control unit 21 does not perform wireless communication with the in-vehicle device 19. Therefore, since unauthorized communication using a repeater by a third party cannot be performed, security is good.

  In this alternative example, the electronic key control unit 21 processes that the electronic key 20 is in a stationary state, and then performs a time-series analysis of the detection results of the geomagnetic sensor 24 periodically performed, so that the electronic key 20 is not stationary. In some cases, it is determined that the state is present, and the state continues for a set time. Even in this case, as shown in FIG. 4, when the set time is exceeded, the electronic key control unit 21 again processes the electronic key 20 as being in a stationary state.

  With this configuration, if the user moves, the electronic key control unit 21 determines that the electronic key 20 is in a non-stationary state at regular intervals. Therefore, if the user touches the door handle, You can switch between locked and unlocked.

It should be noted that, in this another example, has illustrated the position of the parking lot of transportation such as trains and airplanes as a registered position, these are merely illustrative. The registration position is not limited to those related to transportation. It may be related to home or work.

  In this example, the setting time is 1 minute, but this is only an example. The set time is longer than the time during which the electronic key control unit 21 determines that the electronic key 20 is in the non-stationary state and obtains a plurality of detection results of the geomagnetic sensor 24 and can analyze the detection results in time series. I just need it.

  In the above embodiment, the electronic key control unit 21 compares the previous value with the current value of the geomagnetic sensor 24, that is, whether the electronic key 20 is in a stationary state by time series analysis of the detection result of the geomagnetic sensor 24 twice. Although it has been determined whether or not it is in a non-stationary state, three or more time series analyzes may be performed.

  In the above embodiment, for easy understanding, it is determined that a non-stationary state is obtained if these values are different from each other by comparing the previous value and the current value, and a stationary state is determined if these values are the same value. Is set. Therefore, the non-stationary state may be determined when the difference between the previous value and the current value exceeds the tolerance range, and the stationary state may be determined when the difference is within the tolerance range.

  In the above embodiment, the first detection interval in the geomagnetic sensor 24 is exemplified as 1 second interval, and the second detection interval is exemplified as 10 second interval. However, this may be arbitrarily set. The detection interval in the geomagnetic sensor 24 is not limited to two stages. The detection interval may be one step or three or more steps. When the detection interval is set to three or more stages, it is better to use a plurality of detection intervals corresponding to the second detection interval of the above embodiment. If the detection intervals are two or more intervals, power consumption in the electronic key 20 can be suppressed.

  In the above-described embodiment, the case where the in-vehicle device is the door lock device 15 has been described, but other devices such as an engine control device that controls engine start by operating a switch or the like provided in the vehicle. Also good.

In the above embodiment, the electronic key 20 may be a key that can be remotely operated to operate the in-vehicle device by a switch operation. The electronic key control unit 21 may immediately shift to the stationary state when a remote operation is detected in the non-stationary state. With this configuration, the user can remotely operate the in-vehicle device at any time.

  In the above embodiment, the electronic key control unit 21 determines whether the electronic key 20 is in a stationary state or a non-stationary state. However, the in-vehicle control unit 11 determines whether the electronic key 20 is in a stationary state or a door lock device in the above embodiment. It may be determined whether or not the operation 15) is permitted. In this case, the electronic key control unit 21 generates a response signal including the detection result of the geomagnetic sensor 24. The in-vehicle control unit 11 analyzes the detection result included in the response signal in time series to determine whether the electronic key 20 is in a stationary state or a non-stationary state. Even in such a configuration, the same effect as (1) of the above embodiment can be obtained.

  In the other example, the operation of the door lock device 15 is permitted when the in-vehicle control unit 11 determines that the outside verification of the electronic key 20 is established, and the engine control device starts the engine by the in-vehicle control unit 11. Is permitted when it is determined that the in-vehicle verification of the electronic key 20 is established. Therefore, when the door lock device 15 operates and when the engine starts, the position of the user is different, that is, the direction of the electronic key 20 is usually different. In other words, when the direction of the electronic key 20 is the same when the door lock device 15 operates and when the engine is started, there is a risk of unauthorized use of the in-vehicle device by a third party using a repeater. It is preferable that the in-vehicle control unit 11 does not allow the engine to be started.

  In this case, it is preferable to notify the vehicle 10 that there is a risk of theft using a notification device such as a horn or turn signal provided on the vehicle 10 or a notification device such as an indicator provided on the electronic key 20. .

  In the above embodiment, the geomagnetic sensor 24 is used as the magnetic sensor. However, the magnetic key is not limited to the one that detects geomagnetism, and the electronic key control unit 21 or the vehicle-mounted control unit 11 determines the direction of the electronic key 20 by detecting magnetism. Anything is possible.

  In the above embodiment, the stationary electronic key control unit 21 does not generate a response signal when receiving a request signal, but the LF receiving unit 22 itself does not receive a radio signal (request signal) itself. There may be.

  In the above embodiment, the electronic key 20 is not limited to a car-only key. It may be a key using a portable terminal.

DESCRIPTION OF SYMBOLS 1 ... Electronic key system, 10 ... Vehicle, 11 ... In-vehicle control part, 12 ... LF transmission part, 13 ... UHF receiving part, 14 ... Door handle sensor, 15 ... Door lock apparatus, 16 ... GPS sensor, 19 ... In-vehicle machine, DESCRIPTION OF SYMBOLS 20 ... Electronic key, 21 ... Electronic key control part, 22 ... LF receiving part, 23 ... UHF transmission part, 24 ... Geomagnetic sensor, 25 ... Gravity sensor.

Claims (5)

In an electronic key provided with an electronic key control unit that enables operation of an in-vehicle device by performing wireless communication with the in-vehicle device,
A magnetic sensor for detecting magnetism in at least three axial directions;
The magnetic sensor intermittently detects magnetism,
The electronic key control unit determines whether or not the electronic key is in a stationary state by analyzing the detection result of the magnetic sensor in a time series, and when it is determined that the electronic key is in a stationary state, without wireless communication with,
The electronic key has a shorter detection interval when the electronic key control unit determines that the electronic key is in a non-stationary state than the stationary state than when the electronic key controller determines that the electronic key is in a stationary state . The electronic key according to claim 1 , wherein
The electronic key control unit determines that the electronic key is in a stationary state when a change in the detection result of the magnetic sensor over a plurality of times is included in a preset tolerance range, and the detection result of the detection over a plurality of times is determined. An electronic key that determines that the electronic key is in a non-stationary state when a change is not included in the tolerance range. The electronic key according to claim 1 or 2 ,
The electronic key control unit acquires information indicating the position of the vehicle through the wireless communication, and the electronic key is determined to be located at a preset registration position and the electronic key is in a non-stationary state. An electronic key which is processed as if the electronic key is in a stationary state when the state is continuously set for a preset time. In the electronic key as described in any one of Claims 1-3 ,
It has a gravity sensor that detects acceleration in the direction of gravity,
The electronic key control unit determines whether or not the electronic key is in a stationary state by performing time series analysis of the detection result of the gravity sensor in addition to time series analysis of the detection result of the magnetic sensor. In an electronic key system that includes an electronic key that wirelessly communicates with an in-vehicle device, the in-vehicle device enables operation of the in-vehicle device when wireless communication is established with the electronic key,
The electronic key includes a magnetic sensor for detecting magnetism in at least three axial directions;
An electronic key control unit that wirelessly transmits information indicating the detection result of the magnetic sensor to the in-vehicle device,
The vehicle-mounted device is electronically operated when a door lock device that switches between locking and unlocking the vehicle door is operated and when the engine is started by the engine control device based on the received information indicating the detection result of the magnetic sensor. An electronic key system including an in-vehicle control unit that determines whether there is a change in the direction of the key and determines that the direction of the electronic key is the same, and does not allow the engine that is the in-vehicle device to be started .