JP4401927B2 - Loss of protection status warning system - Google Patents

Description

  The present invention relates to a loss-of-protection warning system, and more particularly when a guardian, such as a young child or an elderly person, leaves the guardian's supervision (that is, when a loss of protection occurs). The present invention relates to a warning system for surrounding vehicles.

  Conventionally, a parent and a child are carried by a parent and a guardian respectively, and when the parent and the child are separated by a certain distance or more, this is detected and an alarm is generated on the parent. Technology has already been provided. In such a technology, the guardian who owns the parent device himself / herself has been separated by more than a certain distance due to the occurrence of an alarm (that is, the guardian who owns the child device). Is in a “loss of protection state” away from the supervision of the guardian). However, there is a risk that the protected person who owns the child machine may act dangerously without knowing that he / she is away from the supervision of the guardian and encounter a dangerous state.

  As a technique for dealing with such inconvenience, for example, as described in Patent Document 1, when a parent device possessed by a guardian and a child device possessed by a guardian are separated by a certain distance or more, this is used. Detecting and generating an alarm on the base unit side, and selecting a selection switch for the slave unit from the base unit side to generate an alarm such as sound and light, etc., to alert the protected person is there.

Further, as another technique related to the above-described conventional technique, for example, as described in Patent Document 2, an ID that identifies a pair as a pair between a parent machine and a child machine from another group, for example, While sending and receiving codes, there is one that detects when the two aircraft are separated by more than a certain distance and generates an alarm on the parent machine side.
JP 2003-109147 A JP-A-6-68367

  As mentioned above, as a technique to prevent the guardian who owns the child machine from operating under the supervision of the guardian and not encountering a dangerous state, When the parent machine) and the person to be protected (child machine) are separated from each other by a certain distance, this is detected by the parent machine and notified to the child machine to alert the guardian. (Patent Documents 1 and 2).

  However, in the techniques described in these documents, information is exchanged only between the parent machine and the child machine, and only the protected person can know that he / she is away from the supervision of the guardian. Therefore, depending on the place where the guardian is located, the situation where the guardian is located, the thinking ability of the guardian, etc., it may be difficult to avoid the guardian from being in a dangerous state. For example, when a young child (protected person) walks away from the parent and walks near a road with relatively large traffic, the parent (parent machine) is notified that the distance is over a certain distance. If you are able to immediately understand that you are in a dangerous place and take appropriate measures, there will be no problem. Depending on the behavior of the person, you may not encounter a dangerous situation (traffic accidents, etc.).

  That is, in the above-described conventional technology, only the parties are informed that “the guardian is away from the guardian's supervision” and has not been notified to the surrounding vehicles. There was a problem that could occur.

  The present invention was created in view of the problems in the prior art, and notifies the surrounding vehicle that the person to be protected is in a state of loss of protection away from the guardian's supervision, and pay attention to the driver of the vehicle. It is an object of the present invention to provide a loss-of-protection state warning system capable of preventing injuries that may occur to the person being protected from the vehicle.

  In order to solve the above-described problems of the prior art, according to the basic form of the present invention, a parent device to which a unique identification code is assigned and a child device connected to be communicable with the parent device are provided. The identification code is continuously transmitted from the machine for at least a certain period of time, the reception status of the identification code is monitored in the slave unit, and predetermined identification information is provided when it is determined that the distance from the master unit is a predetermined distance or more. A loss-of-protection state warning system is provided, characterized in that a warning signal is generated and the warning signal is transmitted to a surrounding vehicle equipped with an in-vehicle device that can be communicably connected to the slave unit. The

  According to the protection loss state warning system of the present invention, when the parent device carried by the guardian and the child device carried by the guardian are separated by a predetermined distance or more, the guardian leaves the guardian's supervision. By transmitting a signal (warning signal) indicating that this has occurred to the surrounding vehicles, the guarded person is warned not to cause an unexpected traffic accident. In other words, by alerting the driver of the vehicle, it is possible to prevent the danger that the guardian may receive from the vehicle.

  Other structural features of the present invention and the advantages obtained thereby will be described with reference to preferred embodiments described below.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows a configuration of a loss-of-protection state warning system according to an embodiment of the present invention in the form of a block diagram, and FIG. 2 supplementarily explains the configuration and functions of the system. FIG.

  As shown in FIG. 1, the protection loss state warning system 50 according to the present embodiment includes a parent device 10, a child device 20, and an in-vehicle device 30, and the child device 20 includes the parent device 10 and the in-vehicle device. 30 are communicably wirelessly connected. In the system 50 of the present embodiment, the slave unit 20 can receive a radio signal (identification code ID1) transmitted from the master unit 10 within a predetermined distance and a radio signal (under a predetermined condition) The warning signal ALM) is adapted to be transmitted to a surrounding vehicle (on-vehicle device 30) within a predetermined distance. Further, each of the parent device 10 and the child device 20 is adapted to operate using a battery as a power source.

  As shown in FIG. 2A, the base unit 10 is carried in a pocket of clothes worn by the guardian 1, and similarly, the handset 20 is worn by the guardian 2. In your pocket. Each of the parent device 10 and the child device 20 has a unique identification code ID1, ID2 (a distinction between “guardian” and “protected person” is given as an attribute, respectively). Function as a portable information terminal.

  As will be described later, the slave unit 20 constantly monitors the reception of the radio signal (identification code ID1) emitted from the master unit 10 and determines whether or not it is not more than a predetermined distance from the master unit 10 (that is, the guardian 1 Always staying within the prescribed distance). Then, as shown in FIG. 2B, when the protected person 2 is separated from the parent 1 and the child machine 20 and the parent machine 10 are separated by a predetermined distance or more, the child machine 20 is 2 is judged to be in a dangerous state (protection loss state) where the guardian's 1 eyes have not reached, and a radio signal (warning signal ALM) is transmitted. The determination of “when the distance is greater than or equal to a predetermined distance” is, for example, determined as the “time” when reception of the radio signal (identification code ID1) from the parent device 10 monitored in the child device 20 is interrupted. .

  The warning signal ALM transmitted from the child device 20 is received by the in-vehicle device 30 mounted on the surrounding vehicle 3 existing within a predetermined distance from the child device 20, and based on the warning signal ALM as described later, For example, warning information such as “a child near the guardian's eyes is not present” is issued to alert the driver of the vehicle 3.

  In the example of FIG. 2, both the parent device 10 and the child device 20 are put in the pockets of the wearers 1 and 2, but they are not necessarily in the pockets. It is enough if it is built into what you are doing. In particular, the handset 20 carried by the person to be protected 2 can be incorporated into shoes, a baby carriage, etc. in addition to clothes. If the person to be protected is an elderly person with weak legs, the person to be protected It may be incorporated into a walking stick.

  Referring to FIG. 1, base unit 10 includes control unit 11, register 12 connected to control unit 11, and RF (radio frequency) transmission that performs signal amplification and transmission based on control from control unit 11. And a modulation unit 14 that performs predetermined modulation processing based on control from the control unit 11. The control part 11 is comprised by the microcomputer (microcomputer) etc., and controls the process concerning a loss-of-protection state warning in cooperation with the subunit | mobile_unit 20 side so that it may mention later. The register 12 stores an identification code ID1 of the parent device 10 that can be set based on an external input operation by the user (in this case, the guardian 1).

  Further, the slave unit 20 includes a control unit 21, a warning generation unit 22 that generates a warning signal ALM including predetermined identification information based on control from the control unit 21, and a register 23 connected to the control unit 21. The RF transmitter / receiver 24 and the antenna 24A that perform amplification and transmission / reception of signals based on the control from the control unit 21 and the modulation / demodulation unit 25 that performs predetermined modulation / demodulation processing based on the control from the control unit 21 are provided. The control unit 21 is similarly configured by a microcomputer or the like, and controls processing related to the protection loss state warning in cooperation with the parent device 10 and the in-vehicle device 30 as described later. Similarly to the register 12 of the parent device 10, the register 23 stores the identification code ID1 of the parent device 10 together with the identification code ID2 of the child device 20 that can be set based on an input operation from the outside. Further, the predetermined identification information included in the warning signal ALM generated from the warning generation unit 22 includes an identification code ID2 of the child device 20 and a pair of sets mutually authenticated with the parent device 10 to which the child device 20 corresponds. That is, information that indicates that the information is identified, that is, information that is identified from another set (the parent device and the child device).

  The in-vehicle device 30 also includes a control unit 31, a speaker 32 that outputs warning information as a voice, a display unit 33 such as an LCD monitor that displays warning information on a screen, and a speaker 32 based on control from the control unit 31. A warning voice generation unit 34 that generates warning information to be output from the voice, a drawing processing unit 35 that performs a drawing process of warning information to be displayed on the screen of the display unit 33 based on control from the control unit 31, and a control An RF receiving unit 36 and an antenna 36 </ b> A that receive and amplify signals based on control from the unit 31, and a demodulation unit 37 that performs predetermined demodulation processing based on control from the control unit 31 are provided. The control part 31 is similarly comprised by the microcomputer (microcomputer) etc., and controls the process concerning a protection loss state warning in cooperation with the subunit | mobile_unit 20 side so that it may mention later.

  Hereinafter, processing related to the protection loss state warning performed by the parent device 10 and the child device 20 in cooperation with each other in the system 50 according to the present embodiment will be described with reference to FIG. 3 showing an example of the processing flow.

  First, in the first step S11 (base unit side), the base unit identification code ID1 read from the register 12 based on the control from the control unit 11 is modulated through the modulation unit 14 and further amplified through the RF transmission unit 13. Then, the signal is transmitted through the antenna 13A. It is desirable to transmit the identification code ID1 continuously and intermittently for at least a fixed time.

  As will be described later, since reception of the identification code ID1 is monitored on the side of the slave unit 20, it is ideal that the transmission of the identification code ID1 is continued without interruption. Since power is consumed unnecessarily, it is desirable to perform transmission intermittently as described above. With respect to the processing flow on the base unit side related to the present invention, this is “end”.

  In the next step S21 (on the handset side), the identification code ID1 transmitted from the base unit 10 is received and amplified through the RF transmitting / receiving unit 24 based on the control from the control unit 21, and further demodulated through the modem unit 25. In the control unit 21, the received identification code ID 1 is compared with the identification code ID 1 of the base unit 10 stored in advance in the register 23, and a match between both identification codes is detected. This “coincidence detection state” is continued as long as the identification code ID1 transmitted from the parent device 10 is received. That is, the handset 20 side constantly monitors the reception of the identification code ID1, and checks the comparison result at a constant cycle.

  In the next step S22, the control unit 21 determines whether or not the reception of the identification code ID1 transmitted from the parent device 10 has been interrupted (YES) or not (NO). If the determination result is YES, the process proceeds to the next step S23, and if the determination result is NO, the process returns to step S21 to repeat the above processing.

  In the next step S23, the control unit 21 determines whether a predetermined time has elapsed (YES) or not (NO) after the occurrence of the state where reception of the identification code ID1 is interrupted. There are three possible causes for this “discontinuation of reception”. First, the first factor is a case where the slave unit 20 is separated from the master unit 10 by a predetermined distance or more and out of the receivable range, and the second factor is within the receivable range, but the master unit 10 Is the case where the intermittent transmission of the identification code ID1 from is in a dormant state, and the third factor is temporarily longer than the intermittent period, for example, when an obstacle enters between the parent device 10 and the child device 20 Or when the distance between the two is long, and the dangerous state is not reached. In the case of the second and third factors, reception of the identification code ID1 is resumed after a certain time has elapsed. Therefore, in the determination process of this step, the “predetermined time” to be compared is longer than the “certain period” in which the comparison result of both identification codes is checked in step S21, and communication is interrupted. It is set longer than the length of time considered to have reached a dangerous state. If the determination result is YES, the process proceeds to the next step S24, and if the determination result is NO, the process returns to step S21 to repeat the above process.

  In the next step S24 (when coincidence of both identification codes is not detected for a predetermined time), a warning signal ALM including predetermined identification information is generated from the warning generation unit 22 based on the control from the control unit 21, and further, the modulation / demodulation unit After modulation through 25, the signal is amplified through the RF transmission / reception unit 24 based on the control from the control unit 21 and transmitted through the antenna 24A. This alerts the surrounding vehicles. Then, the processing flow on the handset side is “end”.

  The subsequent processing is performed in the in-vehicle device 30 mounted on the surrounding vehicle. Although not particularly illustrated, for example, the following processing is performed.

  That is, the in-vehicle device 30 receives and amplifies the signal transmitted from the outside (including the warning signal ALM transmitted from the slave device 20) through the RF receiving unit 36 based on the control from the control unit 31, and the demodulation unit When the control unit 31 detects that the received signal is the warning signal ALM including the predetermined identification information, the warning information indicating the fact is generated. That is, by controlling the warning sound generation unit 34, for example, a warning sound such as “a child who is away from the guardian is near” is generated, and the sound is output via the speaker 32. Call attention to the driver (Fig. 2).

  Alternatively, the driver of the vehicle 3 (FIG. 2) is noted by controlling the drawing processing unit 35 to display warning information (character information, icons, etc.) indicating that on the screen of the display unit 33. May be prompted. Moreover, you may make it perform the warning by the audio | voice from the speaker 32 with the warning on the screen by the display part 33 as needed.

  FIG. 4 is a block diagram schematically showing the configuration of a loss-of-protection state warning system according to another embodiment of the present invention.

  The loss-of-protection state warning system 50a according to the present embodiment is provided with an identification code ID1 (a distinction of “guardian” is given as an attribute) in the same manner as the loss-of-protection state warning system 50 (FIG. 1) according to the above-described embodiment. And the in-vehicle device 30a. The in-vehicle device 30a includes the main device 10a, the in-vehicle device 30a, and the in-vehicle device 30a. Each of the devices 30a is wirelessly connected to be communicable. Similarly, the parent device 10a and the child device 20a function as a pair of portable information terminals by performing an authentication procedure with each other using the identification codes ID1 and ID2. In the system 50a of the present embodiment, the parent device 10a and the child device 20a can receive radio signals (identification codes ID1, ID2 and coincidence detection signals DT1, DT2 described later) transmitted from the other party within a predetermined distance. Thus, the slave unit 20a is adapted to transmit a radio wave signal (warning signal ALM) generated under a specified condition to a surrounding vehicle (on-vehicle unit 30a) within a predetermined distance. Further, each of the parent device 10a and the child device 20a uses a battery as a power source.

  The system 50a (FIG. 4) according to the present embodiment is different from the system 50 according to the embodiment of FIG. 1 in the following points. Since other configurations and functions thereof are basically the same as those in the embodiment of FIG. 1, the description thereof is omitted. The differences are as follows.

  First, for the base unit 10a, an RF transmission / reception unit 13a that performs signal amplification and transmission / reception based on control from the control unit 11a, and a modulation / demodulation unit 14a that performs predetermined modulation / demodulation processing based on control from the control unit 11a. Furthermore, a speaker 15 that outputs warning information as a voice and a warning voice generation unit 16 that generates warning information that should be output as a voice from the speaker 15 based on control from the control unit 11a are provided. However, the register 12 stores in advance the identification code ID2 of the child device 20a as well as the identification code ID1 of the parent device 10a that can be set based on an input operation from the outside.

  Moreover, the subunit | mobile_unit 20a is further provided with the GPS receiver 26 connected to the control part 21a so that operation | movement is possible. The GPS receiver 26 detects its current position (in this case, the longitude and latitude of the slave 20a carried by the guardian) based on the GPS signal transmitted from the GPS satellite.

  Further, the in-vehicle device 30a further includes a navigation device 38 that is operatively connected to the control unit 31a. The navigation device 38 includes a map database 39. The map database 39 includes the latest map data (for display and route search) divided into longitude and latitude widths of an appropriate size according to each scale level. Road data, location data of various facilities, etc.) are stored. Since the navigation device 38 is usually provided with a display device (not shown), this display device may also be used as the display unit 33.

  Hereinafter, processing related to the protection loss state warning performed by the parent device 10a and the child device 20a in cooperation with each other in the system 50a according to the present embodiment will be described with reference to FIG. 5 showing an example of the processing flow.

  In the first step S31 (base unit side), the base unit identification code ID1 read from the register 12 based on the control from the control unit 11a is modulated through the modulation / demodulation unit 14a and further amplified through the RF transmission / reception unit 13a. Then, the signal is transmitted through the antenna 13A. Similarly, the transmission of the identification code ID1 is performed continuously and intermittently for at least a fixed time.

  Similarly, in step S41 (on the slave unit side), the slave unit identification code ID2 read from the register 23 based on the control from the control unit 21a is modulated through the modem unit 25 and further amplified through the RF transceiver unit 24. It transmits via the antenna 24A. Similarly, transmission of the identification code ID2 is performed continuously and intermittently for at least a fixed time.

  In the next step S32 (base unit side), the identification code ID2 transmitted from the slave unit 20a is received and amplified through the RF transceiver unit 13a based on the control from the control unit 11a, and further demodulated through the modem unit 14a. In the control unit 11a, the received identification code ID2 is compared with the identification code ID2 of the slave unit 20a stored in advance in the register 12, and a match between both identification codes is detected (a coincidence detection signal DT1 is generated).

  Similarly, in step S42 (child device side), the identification code ID1 transmitted from the parent device 10a is received and amplified through the RF transmitting / receiving unit 24 based on the control from the control unit 21a, and further demodulated through the modem unit 25. In the control unit 21a, the received identification code ID1 is compared with the identification code ID1 of the base unit 10a stored in advance in the register 23, and a coincidence of both identification codes is detected (a coincidence detection signal DT2 is generated).

  In the next step S33 (base unit side), the coincidence detection signal DT1 generated in the control unit 11a is modulated through the modulation / demodulation unit 14a together with the base unit identification code ID1 read from the register 12, and further through the RF transmission / reception unit 13a. After amplification, the signal is transmitted through the antenna 13A.

  Similarly, in step S43 (child device side), the coincidence detection signal DT2 generated in the control unit 21a is modulated through the modem unit 25 together with the slave unit identification code ID2 read out from the register 23, and further through the RF transmitting / receiving unit 24. After amplification, the signal is transmitted through the antenna 24A.

  In the next step S34 (master unit side), the control unit 11a determines whether or not reception of the coincidence detection signal DT2 transmitted from the slave unit 20a has been interrupted (YES) or not (NO). At this time, the base unit 10a checks the reception of the coincidence detection signal DT2 at a constant period. If the determination result is YES, the process proceeds to the next step S35, and if the determination result is NO, the process returns to step S32 and the above processing is repeated.

  Similarly, in step S44 (child device side), the control unit 21a determines whether reception of the coincidence detection signal DT1 transmitted from the parent device 10a has been interrupted (YES) or not (NO). Similarly, the slave unit 20a checks the reception of the coincidence detection signal DT1 at a constant period. If the determination result is YES, the process proceeds to the next step S45, and if the determination result is NO, the process returns to step S42 to repeat the above processing.

  In the next step S35 (master unit side), the control unit 11a determines whether or not a predetermined time has elapsed (YES) or not (NO) after occurrence of a state where reception of the coincidence detection signal DT2 is interrupted. There are three possible causes for the occurrence of this “discontinuous reception” as in the case of the above-described embodiment (step S23 in FIG. 3). Therefore, in the determination process of this step, the “predetermined time” to be compared is longer than the “certain period” in which the reception of the coincidence detection signal DT2 is checked in step S34, and communication is interrupted. It is set longer than the length of time considered to have reached a dangerous state. If the determination result is YES, the process proceeds to the next step S36, and if the determination result is NO, the process returns to step S32 to repeat the above processing.

  Similarly, in step S45 (on the handset side), the control unit 21a determines whether a predetermined time has elapsed (YES) or not (NO) after the state where reception of the coincidence detection signal DT1 is interrupted. Similar to the “predetermined time” in step S35, the “predetermined time” to be compared is longer than the “certain period” in which the reception of the coincidence detection signal DT1 is checked in step S44. It is set to be longer than the length of time considered to be a dangerous situation. If the determination result is YES, the process proceeds to the next step S46, and if the determination result is NO, the process returns to step S42 to repeat the above process.

  In the next step S36 (base unit side), a warning sound such as “a child is far away” is generated by the warning sound generation unit 16 based on the control from the control unit 11a, and the speaker 15 is turned on. The guardian is warned by outputting sound through Then, the processing flow on the base unit side is “end”.

  Similarly, in step S46 (on the side of the handset), the control unit 21a detects the current position of the handset 20a based on the position information (longitude and latitude) detected by the GPS receiver 26, and from the control unit 21a. Based on the control, a warning signal ALM including predetermined identification information is generated from the warning generator 22. Further, based on the control from the control unit 21a, the signal is modulated through the modulation / demodulation unit 25, amplified through the RF transmission / reception unit 24, and then the warning signal ALM is transmitted through the antenna 24A together with the position information indicating the current position of the slave unit 20a. send. This alerts the surrounding vehicles. Then, the processing flow on the handset side is “end”.

  The subsequent processing is performed in the in-vehicle device 30a mounted on the surrounding vehicle. Although not particularly illustrated, for example, the following processing is performed.

  That is, in the in-vehicle device 30a, a signal transmitted from the outside (including the warning signal ALM transmitted from the slave device 20a) is received and amplified through the RF receiving unit 36 based on the control from the control unit 31a, and the demodulation unit When the control unit 31a detects that the received signal is the warning signal ALM including the predetermined identification information, the control unit 31a generates warning information indicating the fact. That is, the warning sound generation unit 34 is controlled to generate a warning sound such as “There is a child away from the guardian nearby”, and the sound is output through the speaker 32, so that the vehicle 3 (FIG. 2) Call the driver's attention. In addition, by controlling the drawing processing unit 35 and displaying warning information (character information, icons, etc.) indicating that on the screen of the display unit 33, attention is paid to the driver of the vehicle 3 (FIG. 2). May be prompted. Moreover, you may make it perform the warning by the audio | voice from the speaker 32 with the warning on the screen by the display part 33 as needed.

  Furthermore, as a function peculiar to this embodiment, in the in-vehicle device 30a, the control unit 31a draws based on the map information obtained from the map database 39 of the navigation device 38 and the position information transmitted from the slave device 20a. The processing unit 35 is controlled to display on the screen of the display unit 33 the point where the child device 20a is present superimposed on the map image. Accordingly, the driver of the vehicle 3 (FIG. 2) can recognize how close the child who is away from the guardian is, so that further attention is urged.

  In each of the above-described embodiments, when reception of the identification code ID1 (coincidence detection signal DT1) from the parent device 10 (10a) monitored on the child device 20 (20a) side is interrupted, “separated more than a predetermined distance” However, the method (means) for detecting whether or not a predetermined distance has been exceeded is not limited to this.

  For example, a GPS receiver is provided in each of the parent device 10 (10a) and the child device 20 (20a), and the distance between the two is calculated from the difference in position information detected by each GPS receiver. Based on this, transmission of the warning signal ALM may be controlled. In addition, it receives radio signals including position and time information transmitted from a plurality of roadside devices installed on the shoulders of the road, and specifies the positions of the parent device 10 (10a) and the child device 20 (20a). You may do it.

  In each of the above-described embodiments, all are based on the warning signal ALM transmitted from the slave unit 20 (20a) when the master unit 10 (10a) and the slave unit 20 (20a) are separated by a predetermined distance or more. Although the case where warning is given to the driver of the surrounding vehicle has been described as an example, the form of calling attention to the driver of the surrounding vehicle is not limited to this, and various other forms are conceivable. An example is shown in FIG.

  In the embodiment illustrated in FIG. 6, a GPS receiver (not shown) is provided in each of the parent device 10b carried by the guardian 1 and the child device 20b carried by the guardian 2, and each GPS reception is performed. Information indicating the current position detected by the machine (the longitude and latitude of the point where the guardian 1 and the guardian 2 are respectively present) is a pair of the parent machine 10b and the slave machine 20b that are mutually authenticated. This is transmitted to the surroundings together with information for identifying from other groups (master unit and slave unit). And in the surrounding vehicle 3 (vehicle equipment 30b), this information (position information and identification information) is received, map information and each position information are compared with reference to a vehicle-mounted map database, and based on this comparison result, When it is determined that the parent device 10b (guardian 1) and the child device 20b (protected person 2) that make a pair with each other exist on opposite sides of the road as shown in the figure, the driver of the vehicle 3 Call attention to. That is, it is determined that there is a possibility that the protected person 2 may jump out of the road toward the guardian 1, and warning information (for example, “a child may jump out on the road ahead”) A message is output from the speaker or displayed on the screen of the display unit to alert the driver of the vehicle 3.

It is a block diagram showing roughly the composition of the protection loss state warning system concerning one embodiment of the present invention. It is a figure for demonstrating supplementarily the structure and function of the system of FIG. It is a flowchart which shows an example of the process which concerns on the protection loss state warning which a main | base station and a subunit | mobile_unit perform in cooperation in the system of FIG. It is a block diagram which shows roughly the structure of the protection loss state warning system which concerns on other embodiment of this invention. FIG. 5 is a flowchart showing an example of processing related to a protection loss state warning performed in cooperation between the parent device and the child device in the system of FIG. 4. It is a figure for demonstrating other embodiment of this invention.

Explanation of symbols

1 ... Parents,
2… Protected person,
3 ... neighboring vehicles,
10, 10, 10b ... Master unit,
11, 11a, 21, 21a, 31, 31a ... control unit,
12, 23 ... registers,
13 ... RF transmitter,
14 Modulation unit,
15, 32 ... speaker,
16, 34 ... warning sound generation unit,
20, 20a, 20b ... handset,
24 ... RF transmitter / receiver,
25. Modulator / demodulator,
30, 30a, 30b ... in-vehicle device,
33 ... Display unit (LCD monitor, etc.)
35 ... drawing processing unit,
36 ... RF receiver,
37. Demodulator,
38 ... navigation device,
39 ... Map database,
50, 50a ... Loss of protection warning system,
ALM ... Warning signal,
DT1, DT2 ... coincidence detection signals,
ID1, ID2 ... identification codes.

Claims (9)

A base unit with a unique identification code,
A slave unit communicably connected to the master unit,
The identification code is continuously transmitted from the master unit for at least a predetermined time, the reception status of the identification code is monitored in the slave unit, and the predetermined identification is performed when it is determined that the master unit is separated from the master unit by a predetermined distance or more. A loss-of-protection state warning system characterized in that a warning signal including information is generated and the warning signal is transmitted to a surrounding vehicle equipped with an in-vehicle device that can be communicably connected to the slave unit.   The predetermined identification information included in the warning signal includes an identification code that uniquely identifies the slave unit, and information that indicates that the slave unit and the master unit are a pair that is mutually authenticated. The loss-of-protection status warning system according to claim 1. The master unit has a transmitter capable of communicating with the slave unit within a predetermined distance,
The slave unit includes a warning generation unit capable of generating the warning signal, a register storing an identification code of the master unit, a transmission / reception unit capable of communicating with the master unit within a predetermined distance, and a control unit. The control unit compares the identification code received via the transmission / reception unit with the identification code stored in the register, and when the coincidence of both identification codes is not detected for a predetermined time, the warning generation unit is The loss-of-protection status warning system according to claim 1, wherein the warning signal is generated by control.   The in-vehicle device includes a speaker, a receiving unit capable of communicating with the slave unit within a predetermined distance, and a control unit, and the control unit receives a signal received via the receiving unit. 4. The loss-of-protection-state warning system according to claim 3, wherein when a warning signal including identification information is detected, warning information indicating the fact is output from the speaker.   The in-vehicle device has a display unit, and the control unit displays warning information indicating that when the received signal is detected as a warning signal including the predetermined identification information. The loss-of-protection status warning system according to claim 3, wherein the system is displayed on the screen. The master unit includes a first register that stores an identification code of the slave unit together with its own identification code, a first transmission / reception unit capable of communicating with the slave unit within a predetermined distance, a speaker, and a first A control unit,
The slave unit includes a warning generation unit capable of generating the warning signal, a second register storing the identification code of the master unit together with its own identification code, and a second register capable of communicating with the master unit within a predetermined distance. 2 transmission / reception units and a second control unit,
In the master unit, the first control unit compares the identification code received via the first transmission / reception unit with the identification code of the slave unit stored in the first register. Transmitting a first match detection signal indicating a match and a self-identification code;
In the slave unit, the second control unit compares the identification code received via the second transmission / reception unit with the identification code of the master unit stored in the second register, and A second coincidence detection signal indicating a coincidence and a self-identification code are transmitted;
In the master unit, the first control unit generates a warning sound through the speaker when reception of the second coincidence detection signal is not detected for a predetermined time,
The warning signal is generated by controlling the warning generation unit by the second control unit in the slave unit when the reception of the first coincidence detection signal is not detected for a predetermined time. The loss-of-protection status warning system according to 1.   The in-vehicle device includes a speaker, a receiving unit capable of communicating with the slave unit within a predetermined distance, and a control unit, and the control unit receives a signal received via the receiving unit. 7. The loss-of-protection status warning system according to claim 6, wherein when it is detected that the warning signal includes identification information, warning information indicating the fact is output from the speaker. The slave unit has a GPS receiver that detects its current position, and the second control unit controls the warning generation unit to generate the warning signal by the GPS receiver. Send the detected self location information,
The in-vehicle device has a display unit and a map database, and the control unit displays warning information indicating that on the screen of the display unit when the reception of the warning signal is detected, Based on the map information obtained from the map database and the position information transmitted from the slave unit, the point where the slave unit is present is displayed superimposed on the map image on the screen of the display unit, The protection loss state warning system according to claim 6. A master unit equipped with a GPS receiver that detects its current position;
A handset provided with a GPS receiver that is mutually authenticated with the base unit and detects its current position;
Equipped with a vehicle equipped with an in-vehicle device having a map database,
Instructing the current position detected by each GPS receiver together with information for identifying from the other set that the parent unit and the child unit are a pair that is mutually authenticated from the parent unit and the child unit Send location information,
In the in-vehicle device, the position information and the identification information transmitted from the parent device and the child device are received, the map information is compared with each other by referring to the map database, and the parent information is based on the comparison result. A loss-of-protection state warning system characterized by generating warning information to that effect when it is determined that there is a machine and a slave on opposite sides of the road.

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