JP2010001642A - Electronic key system, potable machine, and program for potable machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system which rapidly notifies a person, carrying out a portable machine from a vehicle, that the portable machine is carried out. <P>SOLUTION: The portable machine determines whether or not a checking signal transmitted from an in-vehicle unit in a periodical manner (at a communication time interval of the order of 2-3 seconds) is received within 10 seconds (S201), and determines the state of an accessory power source of a vehicle and a speed of the vehicle, on the basis of data (the contents of the checking signal received last) stored in a memory (S205), when the checking signal is not received even after a lapse of more than 10 second (S201:No). When it is determined that the speed of the vehicle is 5 km per hour or less in the on-state of the accessory power source (S205:Yes), the checking signal, which has to be essentially received, is not received. Thus, an alarm device gives an alarm for N-seconds (e.g. 30 seconds) (S206), and processing is completed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic key system that performs wireless communication between an in-vehicle device and a portable device.

  In recent years, in the field of automobile-related technology, an electronic key system including an in-vehicle device mounted on a vehicle and a portable device (electronic key) possessed by a user of the vehicle has been put into practical use. In this type of electronic key system, if authentication by wireless communication is established between the in-vehicle device and the portable device, the user can lock / unlock the door without performing the operation with the mechanical key. This is a mechanism that enables operations such as turning on / off the accessory power supply and starting / stopping the engine.

  By the way, when such an electronic key system is adopted, the user does not need to operate with a mechanical key, and thus the portable device can be taken out of the vehicle even after the accessory power of the vehicle is turned on. Become. Therefore, for example, when the user passes a bag through the door window without recognizing that the portable device is in, there is no portable device even if the driver tries to start or restart the engine thereafter. There will be a situation where the engine cannot be started.

Conventionally, as a technique for solving such a problem, for example, in Patent Document 1 and Patent Document 2, whether or not a presence signal is returned from a portable device to a confirmation signal sent from the in-vehicle device side to the portable device is determined. A system is disclosed in which when there is no signal that is determined on the in-vehicle device side and originally returned, a notification operation is performed on the in-vehicle device side to notify the absence of the portable device.
Japanese Patent No. 2507815 JP 2000-104429 A

  However, in such a conventional system, even if the portable device is taken out from the vehicle, only the presence of the portable device is notified from the in-vehicle device side. There was a problem that I did not notice that I took out.

  In other words, when the portable device is taken out of the vehicle in the conventional system, the in-vehicle device performs a notification operation by an alarm or the like, so that a person in the vehicle compartment can notice the absence of the portable device. A person who is trying to leave the vehicle by putting it in a bag or taking it out of the vehicle cannot recognize that he has taken the portable device. Therefore, there is a possibility that the user goes away from the vehicle without noticing that the portable device has been taken out.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a system for quickly notifying a person who has taken a portable device out of a vehicle.

  The invention described in claim 1 made to achieve the above object comprises an in-vehicle device mounted on a vehicle and a portable device carried by a user, and performs wireless communication between the in-vehicle device and the portable device. Electronic key system. The in-vehicle device includes a confirmation signal transmission unit, and the confirmation signal transmission unit transmits a confirmation signal including at least an on / off state of the accessory power supply of the vehicle at a predetermined communication time interval. The portable device includes a confirmation signal receiving unit, a determination unit, and a portable unit notification unit, the confirmation signal receiving unit receives a confirmation signal transmitted from the in-vehicle device, and the determination unit receives the confirmation signal received by the confirmation signal receiving unit. The on-off state of the accessory power supply of the vehicle is determined based on the signal, and the portable device notifying means determines that the confirmation signal is received by the confirmation signal receiving means while the accessory power supply is on by the determining means. When the determination time cannot be received, a notification operation is performed.

  According to the first aspect of the present invention, when the portable device is to be taken out of the vehicle even though the accessory power supply of the vehicle is on, a notification operation is performed by the portable device. The person who brought out can quickly know the fact.

  According to a second aspect of the present invention, in the electronic key system according to the first aspect, the determination means stores an on / off state of the accessory power supply based on the confirmation signal in an internal storage device, and the accessory power supply is turned on from the stored contents. / Determine the off state.

  According to the invention described in claim 2, since it is possible to determine the on / off state of the accessory power supply of the vehicle based on the storage contents of the storage device, the portable device is in spite of the accessory power supply being in the off state. Thus, it is possible to effectively prevent the notification operation from being performed.

  According to a third aspect of the present invention, in the electronic key system according to the first or second aspect, the in-vehicle device includes a vehicle speed information acquisition unit, and the vehicle speed information acquisition unit acquires vehicle speed information representing a traveling speed of the vehicle. The confirmation signal transmission means transmits the vehicle speed information acquired by the vehicle speed information acquisition means in the confirmation signal and determines that the traveling speed of the vehicle exceeds a predetermined vehicle speed threshold based on the vehicle speed information. After transmitting the confirmation signal at least once, the transmission of the confirmation signal is stopped, and the portable device notifying means performs a notification operation when it is determined that the traveling speed of the vehicle exceeds a predetermined portable threshold based on the vehicle speed information. Not performed.

  According to the invention described in claim 3, the vehicle is traveling above a certain traveling speed, and the confirmation signal is transmitted under a situation where the possibility that the portable device goes out of the vehicle is extremely low. There is no need to perform unnecessary processing such as performing a notification operation.

  According to a fourth aspect of the present invention, in the electronic key system according to any one of the first to third aspects, the portable device includes presence signal return means, and the presence signal return means receives the confirmation signal by the confirmation signal reception means. Then, a presence signal indicating the presence of the portable device is returned to the in-vehicle device. The vehicle-mounted device includes vehicle-mounted device notification means, and the vehicle-mounted device notification means performs a notification operation when a presence signal is not returned from the portable device in response to the confirmation signal transmitted by the confirmation signal transmission means.

According to the invention described in claim 4, it is possible to know that the portable device has been taken out of the vehicle on the in-vehicle device side, and it is possible to cope with the in-vehicle device side.
According to a fifth aspect of the present invention, there is provided a portable device for use in an electronic key system that includes an in-vehicle device mounted on a vehicle and a portable device carried by a user, and performs wireless communication between the in-vehicle device and the portable device. A confirmation signal receiving means, a judging means and a portable device notifying means. The confirmation signal receiving means receives a confirmation signal that is transmitted from the in-vehicle device at a predetermined communication time interval and includes at least an on / off state of the accessory power supply of the vehicle, and the determination means is received by the confirmation signal receiving means. On the basis of the confirmation signal, the on / off state of the accessory power supply of the vehicle is determined, and the portable device notifying means determines that the confirmation signal receiving means receives the confirmation signal in a state where the determination means determines that the accessory power supply is on. When the predetermined judgment time cannot be received, a notification operation is performed.

According to the invention described in claim 5, the same effect as that of the invention described in claim 1 can be obtained.
According to a sixth aspect of the present invention, in the portable device according to the fifth aspect, the determination means stores an on / off state of the accessory power supply based on the confirmation signal in an internal storage device, and the on / off state of the accessory power supply is determined from the stored contents. Determine the off state.

According to the sixth aspect of the invention, the same effect as that of the second aspect of the invention can be obtained.
According to a seventh aspect of the present invention, a computer is provided as a portable device in an electronic key system that includes an in-vehicle device mounted on a vehicle and a portable device carried by a user, and performs wireless communication between the in-vehicle device and the portable device. It is a program for portable devices to function. Based on the confirmation signal receiving means for receiving the confirmation signal including at least the on / off state of the accessory power source of the vehicle, which is transmitted from the in-vehicle device at a predetermined communication time interval, and the confirmation signal received by the confirmation signal receiving means A determination means for determining an on / off state of the accessory power supply of the vehicle, and a confirmation signal cannot be received by the confirmation signal receiving means for a predetermined determination time in a state in which the accessory power supply is determined to be on by the determination means. The computer is caused to function as portable device notification means for performing a notification operation.

  According to the seventh aspect of the invention, the same effect as that of the first aspect of the invention can be obtained.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[1 Configuration]
FIG. 1 is a block diagram showing the overall configuration of the electronic key system of this embodiment. This electronic key system includes an in-vehicle device 1 mounted on a vehicle and a portable device 2 possessed by a user of the vehicle, and when the portable device 2 possessed by the user enters a wireless communication area around the vehicle. A function that enables operations such as unlocking the door (so-called smart entry function) and a function that executes control such as door locking / unlocking according to the button operation on the portable device 2 (so-called remote keyless entry function) ). A vehicle speed sensor 3 is connected to the in-vehicle device 1.

  The in-vehicle device 1 is an electronic control device for an electronic key system including a transmitter 4, a tuner 5, a control ECU 6, an alarm device 7, and the like, and is a battery power source (not shown) or an accessory power source (not shown). The power supply is received from the power supply to detect the on / off state of the accessory power supply.

  Here, the battery power source is a power line that is always connected to the battery, and the accessory power source is a power line that is connected to the battery via an accessory switch (not shown).

  The transmitter 4 and the tuner 5 are communication circuits for performing wireless communication with the portable device 2, and a confirmation signal (existence of the portable device 2) is transmitted from the transmitter 4 to the portable device 2 in accordance with a control signal sent from the control ECU 6. Is transmitted periodically within the wireless communication area covering the vehicle interior (an area smaller than the wireless communication area around the vehicle for the remote keyless entry function, etc.), and the confirmation signal is received. The presence signal (response signal to the confirmation signal) returned from the portable device 2 (existing in the vehicle interior) is received by the tuner 5.

  The control ECU 6 is an electronic control unit that includes a CPU 8, a memory 9, and the like. The CPU 8 reads data from the memory 9, receives data by the tuner 5, executes various data processing, writes to the memory 9, transmits data to the outside from the transmitter 4, This is a control unit that sounds an alarm. The memory 9 is a fixed storage device such as a magnetic disk in which various settings made by the user for the in-vehicle device 1, vehicle speed data acquired from the vehicle speed sensor 3, various calculation data, and the like are stored.

  The warning device 7 is a device for issuing a warning through hearing such as a warning (alarm) or voice, or through vision such as text or screen display. Here, for example, it is assumed that an alarm is set to sound.

  Next, the portable device 2 includes a CPU 10, a memory 11, a reception unit 12, a transmission unit 13, an alarm device 14, and the like, and is carried by a vehicle user. If the user of the vehicle is carrying the portable device 2 in a pocket or hand bag, etc., the vehicle door is unlocked, the vehicle accessory power is turned on, or the ignition power is turned on. The engine can be started.

The CPU 10 is a control device that performs various control processes performed by the portable device 2 such as transmission / reception of signals with the in-vehicle device 1 and writing / reading of data.
The memory 11 is a storage device for storing data. In particular, the memory 11 stores an accessory power on / off state, vehicle speed data, and the like included in the confirmation signal transmitted from the in-vehicle device 1.

  The receiving unit 12 and the transmitting unit 13 are communication circuits for the portable device 2 to perform data communication with the in-vehicle device 1. The receiving unit 12 receives the confirmation signal transmitted from the in-vehicle device 1, and the portable device 2 exists. A presence signal that means to do so is returned from the transmission unit 13 to the in-vehicle device 1.

  The alarm device 14 is a device for issuing a warning to the user by an alarm, sound, vibration (vibrator), LED, screen display, or the like. In the portable device 2, when it is determined that the portable device 2 itself has been taken out of the vehicle even though the accessory power supply of the vehicle is turned on, the portable device 2 can be used by a user carrying the portable device 2. On the other hand, it will call attention by sounding an alarm.

The vehicle speed sensor 3 is a known sensor that detects the traveling speed of the vehicle, and the detection result is input to the in-vehicle device 1 as vehicle speed data. The in-vehicle device 1 includes this vehicle speed data in the confirmation signal and sends it from the transmitter 4 to the portable device 2.
[2 processing]
Next, processing executed by the in-vehicle device 1 and the portable device 2 according to the present embodiment will be described using a flowchart.

  FIG. 2 is a flowchart showing a process executed by the control ECU 6 of the in-vehicle device 1. The CPU 8 of the control ECU 6 starts the processing of this flowchart at the timing when the accessory power supply is turned on.

  First, in S101, it is determined whether the detected accessory power supply is on and the vehicle speed is 5 km / h or less based on the vehicle speed data obtained from the vehicle speed sensor 3. If it is determined in S101 that the accessory power supply is on and the vehicle speed is 5 km / h or less (S101: YES), the process proceeds to S102; otherwise (S101: NO), the process proceeds to S109. Here, 5 km / h corresponds to the vehicle speed threshold of the present invention, but is normally set at a speed at which the portable device 2 is not likely to be taken out of the vehicle. It doesn't have to be 5 kilometers per hour.

  In S102, a confirmation signal is transmitted from the transmitter 4 to the portable device 2 existing in the passenger compartment. Specifically, a confirmation signal including data necessary for verification, data indicating that the accessory power supply is on, vehicle speed data acquired from the vehicle speed sensor 3, and the like is transmitted, and the process proceeds to the next S103.

  In S103, it is determined whether a presence signal is returned from the portable device 2 in response to the confirmation signal transmitted in S102. When the presence signal is returned from the portable device 2 (S103: YES), the process proceeds to S104. When the presence signal is not returned from the portable device 2 (S103: NO), the process proceeds to S106.

  In S104, it is determined whether or not the alarm of the alarm device 7 (sound by the process of S106 described later) is sounding (S104). If it is determined that the alarm is not sounding (S104: NO), the process returns to S101, which is the first process, and if it is determined that the alarm is sounding (S104: YES), a presence signal is returned from the portable device 2 once. (S103: NO), an alarm was sounded (S106), but since there was a reply signal from the portable device 2 thereafter, the alarm of the alarm device 7 is stopped (S105), which is the first process. Return to S101.

That is, S101 to S105 are normal processes executed when it is determined that the portable device 2 exists in the vehicle interior, and this routine is executed at a communication time interval of about 2 to 3 seconds.
If the presence signal is not returned from the portable device 2 in S103 (S103: NO), the portable device 2 is not in the vehicle interior (specifically, in the wireless communication area covering the vehicle interior). The device 7 is sounded and the process proceeds to the next S107.

  In S107, it is determined whether N seconds have elapsed since the alarm device 7 started to sound an alarm (S107). If N seconds have not elapsed (S107: NO), the process returns to S101, which is the first process. If N seconds have elapsed (S107: YES), the alarm is stopped (S108) and the process is performed. finish. N seconds can be arbitrarily set by the user operating a button (not shown). For example, it may be set to about 30 seconds. Here, the alarm device 7 does not remain sounded, for example, when the battery of the portable device 2 runs out or when there is an unplanned situation such as a failure, the alarm device 7 continues to sound. This is because the inconvenience of this is avoided.

  In the first S101, when the accessory power supply is on and the vehicle speed is not determined to be 5 km / h or less (S101: NO), that is, the accessory power supply is turned off or the vehicle speed exceeds 5 km / h. Advances to S109.

  In S109, a confirmation signal is transmitted to the portable device 2 existing in the passenger compartment. Specifically, a confirmation signal including data necessary for collation, data indicating that the accessory power supply is on or off, vehicle speed data acquired from the vehicle speed sensor 3, and the like are transmitted, and the process proceeds to the next S110. Here, the data of either one of whether the accessory power supply is in an off state or the vehicle speed exceeds 5 km / h is necessarily included.

  In S110, it is determined whether or not an alarm is sounding by the alarm device 7 (S110). If it is determined in S110 that the alarm is not sounding (S110: NO), the process is terminated, and if it is determined that the alarm is sounding (S110: YES), it is not necessary to sound the alarm device 7 any more. Then, the alarm of the alarm device 7 is stopped (S111), and the process is terminated.

  FIG. 3 is a flowchart showing processing executed by the CPU 10 of the portable device 2. In this flowchart, the confirmation signal is received from the in-vehicle device 1 at the timing when the accessory power source is turned on, and the processing is started.

  First, in S201, it is determined whether or not the reception unit 12 of the portable device 2 has received the confirmation signal (corresponding to S102 and S109) transmitted from the in-vehicle device 1 within 10 seconds. Specifically, the confirmation signal received here includes data necessary for collation of the portable device 2, data indicating that the accessory power is on or off, vehicle speed data acquired from the vehicle speed sensor 3, and the like. Yes. Here, 10 seconds corresponds to the determination time referred to in the present invention, and measurement is started from the start of processing or from the reception of the previous confirmation signal. Since the confirmation signal sent from 1 is an interval of about 2 to 3 seconds, it is determined for convenience and does not have to be 10 seconds. If the confirmation signal is received within 10 seconds (S201: YES), the process proceeds to S202, and if the confirmation signal is not received after 10 seconds (S201: NO), the process proceeds to S205.

  In S202, based on the data stored in the memory 11, it is determined whether the power state is on and the vehicle speed is 5 km / h or less. This data is stored in the memory 11 in S204, which will be described later. However, at the start of processing, vehicle speed data in which the accessory power is on and the vehicle speed is 5 km / h or less is stored as an initial value. And If the accessory power supply is on and the vehicle speed is 5 km / h or less (S202: YES), the process proceeds to S203, where the accessory power supply is off or the vehicle speed is 5 km / h or less. If not (S202: NO), the process is terminated.

In S203, a presence signal is returned from the transmission unit 13 of the portable device 2 to the in-vehicle device 1, and the process proceeds to the next S204. Further, 5 km / h corresponds to the vehicle speed threshold of the present invention.
In S204, the accessory power supply ON / OFF state and the vehicle speed data are stored in the memory 11, and the process returns to S201, which is the first process.

  That is, S201 to S204 are normal processes executed when the portable device 2 is present in the vehicle interior, and this routine is executed in accordance with the timing (S201) at which the confirmation signal is received.

  If it is determined in S201 that the confirmation signal has not been received even after 10 seconds (S201: NO), the process proceeds to S205. In S205, the state of the accessory power source is on based on the data stored in the memory 11. It is determined whether the vehicle speed is 5 km / h or less.

  If it is determined that the accessory power source is on and the vehicle speed is 5 km / h or less based on the data stored in the memory 11 (S205: YES), a confirmation signal that should have been received is received. In step S206, the alarm device 14 is sounded for N seconds (for example, 30 seconds), and the process ends.

If it is determined based on the data stored in the memory 11 that the accessory power supply is off or the vehicle speed exceeds 5 km / h (S205: NO), the confirmation signal is transmitted further. Since there is not, the process is terminated as it is.
[3 effects]
According to the electronic key system of the present embodiment, when an attempt is made to take the portable device 2 out of the vehicle even though the accessory power supply of the vehicle is on, a warning sound is output from the alarm device 14 of the portable device 2 for N seconds. Since it is sounded (for example, for 30 seconds), the user who tried to take out the portable device 2 can quickly recognize the fact.

Further, since the on / off state of the accessory power supply is included in the confirmation signal and is transmitted and stored in the memory 11 in the portable device 2, it is possible to reliably determine whether the portable device 2 has been taken out.
Furthermore, when the vehicle exceeds a certain traveling speed (for example, 5 kilometers per hour), the processing for sounding the alarm is terminated in both the in-vehicle device and the portable device (S101, S202, S205). In a situation where the possibility of going out is extremely low, unnecessary processing such as transmitting a confirmation signal or performing a notification operation is not required.

Also, the presence signal is returned from the portable device 2 (S203), this is confirmed by the in-vehicle device (S103), and if there is no reply, an alarm is sounded (S106). It is possible to know that it has been taken outside, and the vehicle-mounted device side can also handle it.
[4 Correspondence with Claims]
In the in-vehicle device 1 of the electronic key system of the present embodiment, the CPU 8 of the control ECU 6 that executes S102 and S109 executes the confirmation signal transmitting means, and in the portable device 2, the CPU 10 that executes S201 executes the confirmation signal receiving means, S204. The CPU 10 that performs the power state storage means and the CPU 10 that executes S205 and S206 correspond to the portable device notification means.

In the in-vehicle device 1, the CPU 8 of the control ECU 6 that executes S101 corresponds to vehicle speed information acquisition means.
Further, in the portable device 2, the CPU 10 that executes S203 corresponds to the presence signal return unit, and in the in-vehicle device 1, the CPU 8 of the control ECU 6 that executes S103 and S106 corresponds to the in-vehicle device notification unit.
[5 Other Embodiments]
As mentioned above, although embodiment of this invention was described, it cannot be restricted to these embodiment and it cannot be overemphasized that a various form can be taken.

  For example, in the present embodiment, the processing is terminated when the vehicle speed exceeds 5 km / h. However, this is because the vehicle speed between the in-vehicle device 1 and the portable device 2 is reduced when the vehicle speed becomes 5 km or less. It may be possible to restart the transmission / reception of the confirmation signal and the presence signal, and perform a process of sounding an alarm.

  In this embodiment, the determination process is performed based on the data stored in the memory 11 (that is, the content of the confirmation signal received last time) in S202 in the flowchart of the portable device shown in FIG. For example, the determination process may be performed based on the content of the confirmation signal received from the in-vehicle device 1 in S201 (that is, the confirmation signal received this time). In this way, when the accessory power supply is turned off or when the vehicle speed exceeds 5 km / h (S202: NO), the processing of the portable device 2 is immediately terminated. Accordingly, the processing of the portable device 2 is continued only during the period in which the accessory power source is on. In other words, the accessory power source is on and the vehicle speed is increased while the processing of the portable device 2 is continued. It can be said that the speed is 5 km / h or less. For this reason, S204 becomes unnecessary, and S205 becomes unnecessary accordingly.

  In addition to sounding alarms, the types of alarms are also announced by voice, LEDs are lit and blinking, attention is paid on the screen, vibration is notified, and other devices are signaled wirelessly. Various methods such as sending a message can be taken.

  Even if the alarm continues to sound, it does not have to be 30 seconds, and if there is no inconvenience such as sufficient measures against the battery of the portable device 2 being taken, normal operation is not performed without stopping for N seconds. It can also be configured to keep the alarm sounding until it recovers.

  The portable device 2 can be realized by a so-called electronic key (dedicated device), or any general-purpose small electronic device generally possessed by a user, such as a mobile phone or a PDA, that has a communication function. But it can be realized.

It is a block diagram which shows the whole structure of the electronic key system of embodiment. It is a flowchart which shows the process which control ECU of a vehicle-mounted apparatus performs. It is a flowchart which shows the process which CPU of a portable device performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... In-vehicle device, 2 ... Portable machine, 3 ... Vehicle speed sensor, 4 ... Transmitter, 5 ... Tuner, 6 ... Control ECU, 7 ... Alarm device, 8 ... CPU, 9 ... Memory, 10 ... CPU, 11 ... Memory, 12 ... receiving unit, 13 ... transmitting unit, 14 ... alarm device

Claims (7)

An electronic key system comprising an in-vehicle device mounted on a vehicle and a portable device carried by a user, and performing wireless communication between the in-vehicle device and the portable device,
The in-vehicle device is
A confirmation signal transmitting means for transmitting a confirmation signal including at least an on / off state of the accessory power supply of the vehicle at a predetermined communication time interval;
The portable device is
Confirmation signal receiving means for receiving the confirmation signal transmitted from the in-vehicle device;
Determining means for determining an on / off state of the accessory power supply of the vehicle based on the confirmation signal received by the confirmation signal receiving means;
Portable device notification means for performing a notification operation when the confirmation signal receiving means cannot receive the confirmation signal for a predetermined determination time while the accessory power supply is determined to be on by the determination means; An electronic key system characterized by this.   The determination unit stores an on / off state of the accessory power source based on the confirmation signal in an internal storage device, and determines an on / off state of the accessory power source from the stored content. Electronic key system as described. The in-vehicle device is
Vehicle speed information acquisition means for acquiring vehicle speed information representing the traveling speed of the vehicle,
The confirmation signal transmission means transmits the vehicle speed information acquired by the vehicle speed information acquisition means in the confirmation signal, and the traveling speed of the vehicle exceeds a predetermined vehicle speed threshold based on the vehicle speed information. If it is determined, after transmitting the confirmation signal at least once, stop transmitting the confirmation signal,
3. The electronic device according to claim 1, wherein the portable device notifying unit does not perform a notification operation when it is determined that the traveling speed of the vehicle exceeds a predetermined vehicle speed threshold based on the vehicle speed information. Key system. The portable device is
When the confirmation signal is received by the confirmation signal receiving unit, the vehicle includes a presence signal return unit that returns a presence signal indicating the presence of the portable device to the in-vehicle device,
The in-vehicle device is
4. The vehicle-mounted device notification unit that performs a notification operation when the presence signal is not returned from the portable device in response to the confirmation signal transmitted by the confirmation signal transmission unit. 5. Or electronic key system as described. A portable device for use in an electronic key system comprising an in-vehicle device mounted on a vehicle and a portable device carried by a user, and performing wireless communication between the in-vehicle device and the portable device,
Confirmation signal receiving means for receiving a confirmation signal transmitted at a predetermined communication time interval from the in-vehicle device and containing at least an on / off state of the accessory power supply of the vehicle;
Determining means for determining an on / off state of an accessory power source of the vehicle based on the confirmation signal received by the confirmation signal receiving means;
Portable device notification means for performing a notification operation when the confirmation signal receiving means cannot receive the confirmation signal for a predetermined determination time while the accessory power supply is determined to be on by the determination means; A portable device characterized by this.   6. The determination unit stores an on / off state of the accessory power source based on the confirmation signal in an internal storage device, and determines an on / off state of the accessory power source from the stored content. The portable device described. A portable device program comprising: an in-vehicle device mounted on a vehicle; and a portable device carried by a user, wherein the computer functions as a portable device in an electronic key system that performs wireless communication between the in-vehicle device and the portable device. Because
Confirmation signal receiving means for receiving a confirmation signal transmitted at a predetermined communication time interval from the in-vehicle device and including at least an on / off state of the accessory power supply of the vehicle;
Determining means for determining an on / off state of the accessory power supply of the vehicle based on the confirmation signal received by the confirmation signal receiving means;
The computer functions as a portable device notification means for performing a notification operation when the confirmation signal cannot be received by the confirmation signal receiving means for a predetermined determination time while the accessory power supply is determined to be on by the determination means. A program for portable devices characterized by having

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