JP2017224049A - On-vehicle device and notification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect with sensitivity, a portable terminal which is left behind.SOLUTION: An on-vehicle device is an on-vehicle device which is mounted on a vehicle and is connected to a portable terminal in radio communication, and comprises: an occupant getting-off determination part for determining that, an occupant of the vehicle has gotten off from the vehicle; a radio communication part capable of changing signal intensity of a radio signal which is transmitted to the portable terminal between first intensity and second intensity which is weaker than the first intensity and for performing radio communication with the portable communication by using radio signal; a connection state confirmation part for confirming a connection state with the portable terminal; a notification part for notifying a user of the portable terminal being left behind on the vehicle; and a control part for, when the signal intensity of the radio communication part is changed from the first intensity to the second intensity, it is confirmed that the portable terminal is connected by the connection state confirmation part, and it is determined that the occupant has gotten off from the vehicle by the occupant getting-off determination part, notifying using the notification part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-vehicle device and a notification method.

  2. Description of the Related Art In recent years, a configuration is known in which a function of an in-vehicle device is extended by wirelessly connecting an in-vehicle device installed in a vehicle and a mobile terminal. When the user misplaces the portable terminal in the vehicle, the user feels a great inconvenience. Therefore, a technique for preventing the portable terminal from being misplaced is required. For example, Patent Document 1 discloses means for monitoring the electric field strength when performing short-range wireless communication with a mobile phone and detecting that the mobile phone has been taken out of the passenger compartment.

Japanese Patent No. 4551676

  A technique for detecting misplacement of a mobile terminal with high sensitivity is desired.

According to the first aspect of the present invention, the vehicle-mounted device is a vehicle-mounted device that is mounted on a vehicle and is connected to a mobile terminal by wireless communication, and determines that the vehicle occupant has got off the vehicle. The signal strength of the wireless signal transmitted to the determination unit and the portable terminal can be changed between a first strength and a second strength that is weaker than the first strength, and the portable signal is transmitted using the wireless signal. A wireless communication unit that performs wireless communication with the terminal, a connection state confirmation unit that confirms a connection state with the mobile terminal, a notification unit that notifies that the mobile terminal has been left in the vehicle, and a wireless communication unit When the signal strength is changed from the first strength to the second strength, the connection state confirmation unit confirms that the mobile terminal is connected, and the occupant getting-off determination unit determines that the occupant is It is determined that the car got off When a control unit for informing using the notification unit.
According to the second aspect of the present invention, the notification method is a notification method that is executed in an in-vehicle device that is mounted on a vehicle and connected to the mobile terminal by wireless communication, and is transmitted from the in-vehicle device to the mobile terminal. The signal strength of the radio signal can be changed between a first strength and a second strength that is weaker than the first strength, and the on-vehicle device has the signal strength changed from the first strength to the second strength. When it is confirmed that the mobile terminal and the in-vehicle device are connected and it is determined that the passenger has got off, the mobile terminal is informed that the mobile terminal has been left behind in the vehicle. .

  According to the present invention, misplacement of a mobile terminal can be detected with high sensitivity.

Diagram showing configuration of in-vehicle device Plan view of the vehicle Flow chart showing operation of control unit The flowchart showing operation | movement of the control part in the modification 1. The figure which shows the structure of the vehicle-mounted apparatus in 2nd Embodiment. Plan view of the vehicle in the second embodiment The flowchart showing operation | movement of the control part in 2nd Embodiment.

Hereinafter, with reference to FIGS. 1-3, 1st Embodiment of the vehicle-mounted apparatus which concerns on this invention is described.
(Constitution)
FIG. 1 is a diagram illustrating a configuration of an in-vehicle device 1, a vehicle 3 in which the in-vehicle device 1 is mounted, and a mobile terminal 2 that communicates with the in-vehicle device 1. Although the in-vehicle device 1 and the portable terminal 2 can communicate wirelessly, as will be described later, the communication cannot be performed due to the distance between the in-vehicle device 1 and the portable terminal 2 and the magnitude of the output of radio waves used for communication.
In the first embodiment, only one user is assumed. The vehicle-mounted device 1 is mounted on the vehicle 3 on which the user gets on and off. The user owns the mobile terminal 2 and intends to always carry the mobile terminal 2. Therefore, if the user detects that the mobile terminal 2 is left in the vehicle 3, the user is notified.

The vehicle 3 includes the in-vehicle device 1, a door state detection unit 51, a communication antenna 52, an in-vehicle camera 53, and a light source control unit 54.
The door state detection unit 51 detects the open / closed state and the locked state of each door provided in the vehicle 3 and outputs a signal indicating these states to the in-vehicle device 1. The communication antenna 52 is connected to the in-vehicle device 1 by wire and is used as an external antenna of the in-vehicle device 1. That is, the in-vehicle device 1 communicates with the mobile terminal 2 via the communication antenna 52. The in-vehicle camera 53 images the interior of the vehicle 3 and outputs an image obtained by capturing the image to the in-vehicle device 1. The light source control unit 54 controls a light source provided in the vehicle 3, for example, a headlight or a room light, based on an operation command of the in-vehicle device 1.

The in-vehicle device 1 includes a control unit 11, a power management unit 12, a door state input unit 13, an in-vehicle device communication unit 15, an image input unit 16, and a notification unit 17.
The control unit 11 includes a CPU, ROM, and RAM (not shown). The program stored in the ROM is expanded in the RAM and executed by the CPU, thereby performing the operations described later. The power management unit 12 receives an operation signal of an ignition key switch (not shown) operated by the user, and controls the power sources of the in-vehicle device 1, the door state detection unit 51, the in-vehicle camera 53, and the light source control unit 54. That is, in the present embodiment, even if the ignition key switch is turned off by the user, the power sources of the in-vehicle device 1, the door state detection unit 51, the in-vehicle camera 53, and the light source control unit 54 are not immediately shut off. The power sources of the in-vehicle device 1, the door state detection unit 51, the in-vehicle camera 53, and the light source control unit 54 are cut off after the processing described later is performed by the in-vehicle device 1. The door state input unit 13 receives signals indicating the open / closed state and the locked state of each door provided in the vehicle 3 from the door state detecting unit 51.

  The in-vehicle device communication unit 15 is a communication module that performs wireless communication, such as Bluetooth (registered trademark) or a wireless LAN communication module. The in-vehicle device communication unit 15 performs wireless communication with the mobile terminal 2 via the communication antenna 52. The in-vehicle device communication unit 15 has a connection confirmation function for determining whether communication with the mobile terminal 2 is possible, that is, whether connection with the mobile terminal 2 is possible. The in-vehicle device communication unit 15 controls the power supplied to the communication antenna 52 based on the operation command of the control unit 11 and controls the output of the radio wave output from the communication antenna 52. The in-vehicle device communication unit 15 can control the power supplied to the communication antenna 52 in several stages. In the present embodiment, the in-vehicle apparatus communication unit 15 controls the power in two stages of maximum output and limited output. The in-vehicle device communication unit 15 normally has a maximum output, and a limited output in the case described later. That is, the strength used for normal communication of a radio signal transmitted to the mobile terminal 2 is strength at which the power supplied from the in-vehicle device communication unit 15 to the communication antenna 52 is the maximum output. Hereinafter, switching from the maximum output to the limited output is also referred to as lowering the output. In addition, the distance which can receive in the portable terminal 2 the radio signal transmitted via the communication antenna 52 from the vehicle-mounted apparatus 1 becomes long, so that the electric power which the vehicle-mounted apparatus communication part 15 outputs is large. Therefore, if the intensity of the radio signal transmitted from the mobile terminal 2 is sufficient, the greater the power output from the in-vehicle device communication unit 15 is, the longer the communicable distance between the in-vehicle device 1 and the mobile terminal 2 is. The communication area is expanded. Furthermore, the communication speed can be increased.

The image input unit 16 outputs the captured image input from the in-vehicle camera 53 to the control unit 11. The notification unit 17 controls the light source control unit 54 based on the operation command from the control unit 11. By this control, the light source control unit 54 turns on the headlight or blinks the room light.
The mobile terminal 2 includes a mobile terminal communication unit 25. The portable terminal communication unit 25 is a wireless communication module including an antenna, and communicates with the in-vehicle device 1 using a wireless signal, that is, a radio wave. However, since the in-vehicle device 1 does not include an antenna, the in-vehicle device 1 communicates with the in-vehicle device 1 via the antenna 52 provided in the vehicle 3.

(Plan view of the vehicle)
FIG. 2 is a plan view of the vehicle 3. The upper direction in the figure is the traveling direction of the vehicle 3. The vehicle 3 includes an in-vehicle device 1, a communication antenna 52, a driver seat 61, a driver seat door 61d, a passenger seat 62, a passenger seat door 62d, a right rear seat 63, and a right rear seat door 63d. The left rear seat 64 and the left rear seat door 64d are provided. In FIG. 2, two concentric circles 52 </ b> S and 52 </ b> L centering on the communication antenna 52 indicate a communication area that can communicate with the in-vehicle device communication unit 15, that is, an output limited communication area 52 </ b> S and a normal communication area 52 </ b> L. The normal communication area 52L is wider than the output limited communication area 52S. Positions A, B, and C are positions used for the explanation to be described later. The position A exists inside the output limited communication area 52S and the normal communication area 52L. The position B exists outside the output limited communication area 52S and inside the normal communication area 52L. The position C exists outside the output limited communication area 52S and the normal communication area 52L.

The driver seat door 61d, the passenger seat door 62d, the right rear seat door 63d, and the left rear seat door 64d are connected to the door state detection unit 51 described above. The door state detection unit 51 detects the open / closed state and the locked state for each of these four doors.
The normal communication area 52L is a communication area at the normal time, that is, when the in-vehicle device communication unit 15 outputs power to the communication antenna 52 with the maximum output. The output restricted communication area 52S is a communication area at the time of restricted output. The output limited communication area 52S is a minimum range including all seats of the vehicle 3 with the communication antenna 52 as the center. The limited output is an output of power limited so that the communication area becomes the output limited communication area 52S, and its value is determined in advance by design or actual machine test.
If the mobile terminal 2 is outside the communication area, the mobile terminal 2 cannot receive a radio signal transmitted from the in-vehicle apparatus 1 via the communication antenna 52. Therefore, the in-vehicle apparatus 1 and the mobile terminal 2 cannot communicate with each other and are connected. Can not. That is, when the mobile terminal 2 is at the position B, communication is possible when the communication area of the in-vehicle device communication unit 15 is the normal communication area 52L, but the communication area of the in-vehicle device communication unit 15 is the output restriction communication area 52S. In the case of, communication is not possible. Further, when the mobile terminal 2 is at the position A, the position A is inside the output limited communication area 52S, and therefore communication is possible in any case where the communication area of the in-vehicle device communication unit 15 is any of the above. Further, when the mobile terminal 2 is at the position C, since the position C is outside the normal communication area 52L, communication cannot be performed when the communication area of the in-vehicle device communication unit 15 is any of the above.

(Outline of processing)
The in-vehicle device 1 normally does not limit the output of the in-vehicle device communication unit 15 and sets the communication area of the in-vehicle device communication unit 15 as a normal communication area 52L. When the in-vehicle device 1 detects the user's getting off, the output of the in-vehicle device communication unit 15 is limited, and the communication area of the in-vehicle device communication unit 15 is set as the output limited communication area 52S. And the connection state of the vehicle-mounted apparatus 1 and the portable terminal 2 is confirmed, and if it is connected, it will alert | report to a user using the alerting | reporting part 17. FIG. This is to notify that the user has left the portable terminal 2 in the vehicle because the portable terminal 2 is left inside the output restricted communication area 52S, that is, inside the vehicle 3, even though the user gets off. It is.
The in-vehicle device 1 determines that the user has got off when detecting the following three. That is, the ignition key switch is turned off by the user, the driver's seat door 61d is opened and closed, and the driver's seat door 61d is locked.

(flowchart)
When the power management unit 12 receives the ignition key switch OFF operation signal, the control unit 11 of the in-vehicle device 1 executes a program whose operation is represented by FIG. The execution subject of each step described below is a CPU constituting the control unit 11.
In step S101, it is determined whether or not the door state input unit 13 detects opening / closing and locking of the driver's seat door 61d within a predetermined time. When it is determined that opening / closing and locking of the driver's seat door 61d are detected, the process proceeds to step S102, and when it is determined that at least one of opening / closing and locking of the driver's seat door 61d is not detected, the flowchart of FIG. Situations where a negative determination is made in this step are, for example, when the ignition key switch is turned OFF for a break in the vehicle but the driver's seat door 61d cannot be opened, that is, when the user does not get off, This is a case where the lock is not intentionally made to return.

In step S102, the output for wireless communication, that is, the power supplied to the communication antenna 52 is reduced in the in-vehicle device communication unit 15, and the process proceeds to step S103. By the processing in this step, the communication area of the in-vehicle device communication unit 15 becomes the output limited communication area 52S.
In step S103, the in-vehicle device communication unit 15 is made to confirm the connection state with the portable terminal 2, and the process proceeds to step S104. When the mobile terminal 2 has successfully received a radio signal transmitted from the in-vehicle device 1 via the communication antenna 52, the mobile terminal 2 transmits a radio signal indicating that to the in-vehicle device 1 via the communication antenna 52. To do. The in-vehicle device communication unit 15 can check the connection state with the portable terminal 2 depending on whether or not the wireless signal has been received.

In step S104, it is determined whether or not connection with the portable terminal 2 is detected in step S103. If it is determined that a connection has been detected, the process proceeds to step S105. If it is determined that a connection has not been detected, the flowchart of FIG. 3 ends. The case where a negative determination is made in this step is a case where the user carries the mobile terminal 2 and leaves the vehicle 3.
In step S105, the notification unit 17 is used to notify the user that the portable terminal 2 has been left behind, and the flowchart of FIG.
After executing the flowchart of FIG. 3, the control unit 11 shuts off the power to the in-vehicle device 1, the door state detection unit 51, the in-vehicle camera 53, and the light source control unit 54.

According to the first embodiment described above, the following operational effects are obtained.
(1) The in-vehicle device 1 is mounted on the vehicle 3 and connected to the mobile terminal 2 by wireless communication. The in-vehicle device 1 is configured to determine whether an occupant getting off the vehicle 3 gets out of the vehicle 3 (step S101 in FIG. 3) and the strength of the radio signal transmitted to the mobile terminal 2 to the first strength, that is, normal It is possible to change between the intensity corresponding to the maximum output used for the communication and the second intensity that is weaker than the first intensity, that is, the intensity corresponding to the limited output. A wireless communication unit that performs communication, that is, an in-vehicle device communication unit 15 and a connection state confirmation unit (Step S103 in FIG. 3) for confirming a connection state between the portable terminal 2 and the misplacement of the portable terminal 2 in the vehicle 3 When the signal strength of the notification unit 17 and the wireless communication unit is changed from the first strength to the second strength, the connection state confirmation unit confirms that the portable terminal 2 is connected and determines whether the occupant gets out of the vehicle. Depending on the part If it is determined that the vehicle, and a control unit 11 for notifying with the notification unit 17.

  Since the in-vehicle device 1 changes the signal strength of wireless communication to a strength weaker than that used for normal communication and evaluates the presence or absence of connection with the portable terminal 2, the portable terminal 2 exists in the output restricted communication area 52S. Whether or not the portable terminal 2 is left in the vehicle can be detected with high sensitivity. Unlike the present embodiment, for example, a method of estimating the distance of the portable terminal 2 by detecting the electric field strength at the time of wireless communication and comparing the electric field strength with a predetermined threshold value may be considered. However, since the electric field strength changes depending on factors other than the distance, the threshold value of the electric field strength for determining whether or not the mobile terminal 2 exists inside the vehicle 3 needs to be set strictly in order to prevent overdetection. Yes, the sensitivity to detect forgetting to place the mobile terminal 2 in the vehicle must be poor. However, according to the control unit 11 described above, there is no such problem, and the misplacement of the mobile terminal 2 can be detected with high sensitivity.

(2) When the occupant getting-off determination unit (step S101 in FIG. 3) determines that the occupant gets off, the control unit 11 changes the signal strength of the wireless communication unit from the first strength to the second strength, and then The connection state confirmation unit (step S103 in FIG. 3) confirms the connection state.
(3) The passenger getting-off determination unit (step S101 in FIG. 3) uses the opening / closing of the door provided in the vehicle to determine whether the passenger gets off. Therefore, it is possible to easily determine getting off.
(4) The notification method is executed in an in-vehicle device mounted on a vehicle and connected to the mobile terminal by wireless communication, and the signal strength of the radio signal transmitted from the in-vehicle device to the mobile terminal is set to the first strength and the first strength. The in-vehicle device can be changed between the weaker second strength and the in-vehicle device is connected to the in-vehicle device when the signal strength is changed from the first strength to the second strength. If it is confirmed that the occupant has got off the vehicle, the mobile terminal is informed that the mobile terminal has been left in the vehicle.

(Modification 1)
In 1st Embodiment, after determining that the user got off, the output of the vehicle-mounted apparatus communication part 15 was restrict | limited. However, the output of the in-vehicle device communication unit 15 may be limited only on the condition that the ignition key switch is turned off. That is, when the ignition key switch is turned OFF by the user, the in-vehicle device 1 restricts the output of the in-vehicle device communication unit 15 and sets the communication area as the output restricted communication area 52S. When the opening / closing and locking of the driver's seat door 61d are detected, the connection state of the in-vehicle device 1 and the portable terminal 2 is confirmed. If the connection is being established, the notification unit 17 is used to notify the user.

The operation of the control unit 11 in Modification 1 will be described with reference to FIG. FIG. 4 is a flowchart showing processing executed by the CPU of the control unit 11 in Modification 1 instead of FIG. 3 in the first embodiment. In FIG. 4, the same step numbers are assigned to the same processes as in FIG.
When the power management unit 12 receives the ignition key switch OFF operation signal, the control unit 11 of the in-vehicle device 1 executes a program whose operation is represented by FIG.

In step S111, the in-vehicle device communication unit 15 reduces the output of wireless communication, and the process proceeds to step S112. In a succeeding step S112, it is determined whether or not the door state input unit 13 detects opening / closing and locking of the driver's seat door 61d. When it is determined that opening / closing and locking of the driver's seat door 61d are detected, the process proceeds to step S103, and when it is determined that at least one of opening / closing and locking of the driver's door 61d is not detected, the process stays at step S112.
Since the processing after step S103 is the same as that of the first embodiment, the description thereof is omitted.

According to the first modification described above, the following operational effects are obtained in addition to the operational effects of the first embodiment.
(1) The in-vehicle device 1 includes an operation signal receiving unit that receives operation information of the ignition key of the vehicle 3, that is, a power management unit 12. When the operation signal receiving unit receives information that the ignition key is turned off, the control unit 11 uses the signal strength of the wireless communication unit, that is, the in-vehicle device communication unit 15 to be weaker than the strength used for normal communication with the portable terminal. When the occupant getting-off determination unit determines that the passenger has got off, the connection state is checked by the connection state checking unit.
Therefore, since the signal strength is reduced before the passenger getting off is determined and the communication area is changed to the output-restricted communication area 52S, the connection state is quickly compared with the case where the signal strength is reduced after the passenger is determined to have got off the vehicle. Can be confirmed.

(Modification 2)
You may further utilize the picked-up image acquired by the camera 53 in the vehicle for the detection of a user's getting off. In this case, after the driver's seat door 61d is opened and closed and locked, the in-vehicle camera 53 captures the interior of the vehicle, and if the user cannot be detected from the captured image, it is determined that the user has got off the vehicle.
Further, a weight sensor may be provided under the driver's seat 61, and an output of the weight sensor may be further used to detect the passenger getting off. In this case, after the driver's seat door 61d is opened and closed and locked, the output of the weight sensor is acquired, and when it is estimated that the output is small and the user is not sitting, it is determined that the user has got off the vehicle.
According to the second modification, it is carefully determined that the user has got off the vehicle, and over-detection, that is, the user is prevented from leaving the portable terminal 2 in the vehicle even though the user remains in the vehicle is prevented. can do.

(Modification 3)
The control part 11 may alert | report that it is not misplaced, when the misplacement of the portable terminal 2 is not detected. In this case, the notification when the misplacement is detected is determined to be distinguishable notification. For example, when misplacement is detected, the headlight is turned on, and when no misplacement is detected, the room light is turned on.

(Modification 4)
The alerting | reporting part 17 may alert | report using an audio | voice. For example, the notification unit 17 may use a horn provided in the vehicle 3 or may include a separate audio output unit.

(Second Embodiment)
A second embodiment of the in-vehicle device will be described with reference to FIGS. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. Points that are not particularly described are the same as those in the first embodiment. The present embodiment is different from the first embodiment in that it is mainly based on the premise that there are a plurality of users and forgetting to leave the mobile terminal for each seat.

(Constitution)
FIG. 5 is a diagram illustrating a configuration of the in-vehicle apparatus 1A according to the second embodiment.
The vehicle 3A according to the second embodiment is different from the first embodiment in that a communication antenna is provided in each seat. That is, the vehicle 3 </ b> A includes the first antenna 521 to the fourth antenna 524.
The in-vehicle apparatus 1A in the second embodiment is different from the first embodiment in the program stored in the ROM of the control unit 11. That is, the operation of the control unit 11 is different from that of the first embodiment.

The in-vehicle device communication unit 15 is connected to the four antennas described above via signal lines, and communicates with the mobile terminal 2 via these antennas. The in-vehicle device communication unit 15 determines the strength of the signal received from the mobile terminal 2 for each antenna and communicates using the antenna having the strongest signal strength. The in-vehicle device communication unit 15 can control the power supplied to each antenna. The in-vehicle device communication unit 15 can control the power supplied to each antenna in several stages, but in this embodiment, the in-vehicle apparatus communication unit 15 uniformly controls the power in two stages of maximum output and limited output. In other words, when the in-vehicle device communication unit 15 supplies power to the first antenna 521 with the maximum output, it also supplies power to the second antenna 522 to the fourth antenna 524 with the maximum output. Similarly, when the in-vehicle device communication unit 15 supplies power to the first antenna 521 with limited output, the power is also supplied to the second antenna 522 to the fourth antenna 524 with limited output. However, the specific limit output value differs for each antenna due to the individual differences of the antennas and the influence of the antenna installation position. Details will be described later. The in-vehicle device communication unit 15 normally has a maximum output, and a limited output in the case described later.
The configuration of the portable terminal 2 is the same as that of the first embodiment.

(Plan view of the vehicle)
FIG. 6 is a plan view of the vehicle 3A according to the second embodiment. The driver seat 61 is provided with a first antenna 521, the passenger seat 62 is provided with a second antenna 522, the right rear seat 63 is provided with a third antenna 523, and the left rear seat 64 is provided with a fourth antenna 524. Is provided. The first antenna 521 to the fourth antenna 524 are connected to the in-vehicle device 1 by a signal line (not shown). Since the relationship between each antenna, seat, and communication area is the same, the relationship between the first antenna 521, the driver's seat 61, and the communication areas 61S and 61L will be described as a representative.
In the second embodiment, a driver seated in the driver's seat 61, a passenger seat 62, a right rear seat 63, and a passenger seated in at least one of the left rear seat 64 are collectively referred to as a user. Any user has a portable terminal 2.

  The communication area 61 </ b> S is an area where the mobile terminal 2 in which the in-vehicle device communication unit 15 can communicate via the first antenna 521 when the power supplied to the first antenna 521 is a limited output. The communication area 61 </ b> L is an area where the mobile terminal 2 in which the in-vehicle device communication unit 15 can communicate via the first antenna 521 when the power supplied to the first antenna 521 is the maximum output. The communication area 61S is a minimum range including the driver's seat 61 with the first antenna 521 as the center. The limited output supplied to the first antenna 521 is a power output in which an area in which communication via the first antenna 521 can be performed is the communication area 61S described above. The communication area 61L is wider than the communication area 61S. That is, the first antenna 521 includes at least the driver's seat 61 in the communication range.

(Outline of processing)
The in-vehicle device 1 normally does not limit the output of the in-vehicle device communication unit 15 and supplies power to each antenna with the maximum output. Therefore, the normal communication areas of each antenna are communication areas 61L, 62L, 63L, and 64L.
When detecting the opening / closing of the door, the in-vehicle device 1 reduces the power supplied to each antenna of the in-vehicle device communication unit 15 to the limited output, and narrows the communication area. When the connection with the mobile terminal 2 is confirmed via the antenna corresponding to the opened / closed door, the notification unit 17 is used to notify the user.

(flowchart)
The operation of the control unit 11 in the second embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing processing executed by the CPU of the control unit 11 in the second embodiment instead of FIG. 3 in the first embodiment. In FIG. 7, the same step numbers are assigned to the same processes as in FIG. The control unit 11 always executes a program whose operation is represented by FIG.
In step S121, it is determined whether the door state input unit 13 has detected opening / closing of any of the doors 61d to 64d. If it is determined that the opening / closing of any door is detected, the process proceeds to step S122. If it is determined that at least one of the opening / closing or locking of any door is not detected, the process stays at step S121.

In step S122, the power supplied to the first antenna 521 to the fourth antenna 524 is reduced to a limited output. In continuing step S123, the vehicle-mounted apparatus communication part 15 is made to confirm the connection state with the portable terminal 2, and it progresses to step S124. If the mobile terminal 2 has successfully received a radio signal transmitted from the in-vehicle device 1 via any one of the first antenna 521 to the fourth antenna 524, the mobile terminal 2 transmits a radio signal indicating the fact to the antenna. It transmits to the vehicle-mounted apparatus 1 via. The in-vehicle device communication unit 15 can check the connection state with the portable terminal 2 depending on whether or not the wireless signal has been received. Depending on the transmission output of the mobile terminal 2, the in-vehicle device 1 and the mobile terminal 2 may be communicable via a plurality of antennas. In such a case, the radio signal received from the mobile terminal 2 is the most What is necessary is just to select the antenna from which high signal strength is obtained, and to confirm the connection state with the portable terminal 2.
In step S124, it is determined whether or not the connection with the portable terminal 2 has been confirmed via the antenna corresponding to the door whose opening / closing is detected in step S121. For example, when the opening / closing of the left rear seat door 64d is detected in step S121, it is determined whether or not the connection with the portable terminal 2 is confirmed via the fourth antenna 524. If it is determined that a connection has been detected, the process proceeds to step S105. If it is determined that a connection has not been detected, the flowchart of FIG. 7 ends.

According to the second embodiment described above, the following operational effects can be obtained.
(1) The vehicle 3A is wired-connected to a plurality of seats 61 to 64, a plurality of doors 61d to 64d corresponding to each of the plurality of seats, and a wireless communication unit including at least a communication range of each of the plurality of seats. A plurality of antennas 521 to 524 are provided. The passenger getting-off determination unit (step S121 in FIG. 7) uses the opening and closing of the door to determine whether the passenger gets off. When the occupant getting-off determination unit determines that the occupant gets off, the control unit 11 changes the signal strength of the wireless communication unit to a strength that is weaker than the strength used for normal communication with the mobile terminal (step S122 in FIG. 7). After that, when the connection state confirmation unit confirms the connection with the portable terminal through the antenna including at least the communication range of the seat corresponding to the door used by the passenger getting-off determination unit for the determination of getting off, the notification unit 17 notifies the user. To do.
Therefore, the mobile terminal 2 misplaced by each occupant of the vehicle 3A can be detected and the misplacement can be notified.

(Modification 1 of the second embodiment)
You may further utilize the picked-up image obtained by the camera 53 in the vehicle for the detection of a passenger | crew's getting off. For example, it is also possible to detect a person from a plurality of photographed images taken at different times and to reduce the number of detected persons as an additional condition for alighting determination. Further, it may be determined whether or not the opened / closed door corresponds to the position of the person who is no longer detected. Each seat may be provided with a weight sensor, and the output of the weight sensor may be further used to detect the passenger getting off.

(Modification 2 of the second embodiment)
Not all seats may be equipped with an antenna. An antenna may be provided only in a specific seat, for example, a driver seat with a high seating rate and the rear right, and only forgetting to leave the mobile terminal 2 in the two seats may be detected.

(Modification 3 of the second embodiment)
The vehicle 3A may include only three antennas, and the presence / absence of the portable terminal 2 at an arbitrary position in the vehicle may be determined by a triangulation mechanism using the three antennas. That is, based on the strength of the radio signal transmitted from the mobile terminal 2 and received by each of the three antennas, the presence / absence of the mobile terminal 2 in the vehicle is determined, and if the mobile terminal 2 exists, the position thereof is determined. it can. Thereby, the misplacement of the mobile terminal 2 in an arbitrary seat can be detected. In this case, the number of antennas can be suppressed to 3 regardless of the number of seats. Moreover, it is not necessary to adjust the communication area at the time of restricted output according to each seat. Four or more antennas may be used.

(Modification 4 of the second embodiment)
When detecting the opening / closing of the door, the in-vehicle device 1 may reduce the power supplied to the antenna corresponding to the opened / closed door to the limited output and stop the power supplied to other antennas. According to this modification, it is possible to easily detect forgetting to place the mobile terminal 2 in the seat corresponding to the opened / closed door.

Although the program is stored in a ROM (not shown), the program may be stored in a nonvolatile memory. Further, the in-vehicle device may include an input / output interface (not shown), and a program may be read from another device via the input / output interface and a medium when necessary. Here, the medium refers to, for example, a storage medium that can be attached to and detached from the input / output interface, or a communication medium, that is, a wired, wireless, or optical network, or a carrier wave or digital signal that propagates through the network. Also, part or all of the functions realized by the program may be realized by a hardware circuit or FPGA.
The above-described embodiments and modifications may be combined.
Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 1A ... In-vehicle apparatus 2 ... Portable terminal 3, 3A ... Vehicle 11 ... Control part 12 ... Power supply management part 13 ... Door state input part 15 ... In-vehicle apparatus communication part 17 ... Informing part 61, 62, 63, 64 ... Seat 61d , 62d, 63d, 64d ... door 521 ... first antenna 522 ... second antenna 523 ... third antenna 524 ... fourth antenna

Claims (6)

An in-vehicle device mounted on a vehicle and connected to a mobile terminal by wireless communication,
An occupant getting-off determination unit for determining that an occupant of the vehicle has got off the vehicle;
The signal strength of a radio signal transmitted to the portable terminal can be changed between a first strength and a second strength that is weaker than the first strength, and the portable terminal and the radio are transmitted using the radio signal. A wireless communication unit for communication;
A connection state confirmation unit for confirming a connection state with the mobile terminal;
A notifying unit for notifying that the mobile terminal is left behind in the vehicle;
When the signal strength of the wireless communication unit is changed from the first strength to the second strength, the connection state confirmation unit confirms that the portable terminal is connected, and the passenger getting-off determination An in-vehicle device comprising: a control unit that notifies using the notification unit when the unit determines that the occupant has got off the vehicle. The in-vehicle device according to claim 1,
The controller is
When the passenger getting-off determination unit determines that the passenger gets off, the signal strength of the wireless communication unit is changed from the first strength to the second strength,
A vehicle-mounted device that causes the connection state confirmation unit to confirm the connection state thereafter. The in-vehicle device according to claim 1,
An operation signal receiving unit for receiving operation information of an ignition key of the vehicle;
The controller is
When the operation signal receiving unit receives information that the ignition key is turned off, the signal strength of the wireless communication unit is changed from the first strength to the second strength,
The in-vehicle device that confirms the connection state by the connection state confirmation unit when the occupant departure determination unit determines that the passenger is getting off. In the in-vehicle device according to claim 2 or claim 3,
The occupant getting-off determination unit is an in-vehicle device that uses opening / closing of a door provided in the vehicle to determine whether the occupant gets out. The in-vehicle device according to claim 1,
The vehicle includes a plurality of seats, a plurality of doors corresponding to each of the plurality of seats, and a plurality of antennas that are wired to the wireless communication unit and include each of the plurality of seats in at least a communication range. ,
The passenger getting-off determination unit uses the opening and closing of the door to determine whether the passenger gets off,
The controller is
When the passenger getting-off determination unit determines that the passenger gets off, the signal strength of the wireless communication unit is changed from the first strength to the second strength,
Thereafter, when the connection state confirmation unit confirms the connection with the portable terminal via the antenna including at least the seat corresponding to the door used by the passenger getting-off determination unit for the determination of getting off, the notification In-vehicle device that reports using the unit. A notification method executed in an in-vehicle device mounted on a vehicle and connected to a mobile terminal by wireless communication,
The signal strength of a radio signal transmitted from the in-vehicle device to the mobile terminal can be changed between a first strength and a second strength that is weaker than the first strength,
When the signal strength is changed from the first strength to the second strength, the in-vehicle device is confirmed to be in a state where the mobile terminal and the in-vehicle device are connected, and an occupant gets off the vehicle. If determined, a notification method for notifying that the mobile terminal is left behind in the vehicle.

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