JP2017013640A - On-vehicle information apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle information apparatus whose theft detection mechanism is hardly perceived.SOLUTION: A current detection part 10 detects a dark current that undergoes a passage change from a return path B2 to be formed when an on-vehicle information apparatus 1 is mounted to a return path B1 by removing the on-vehicle information apparatus 1, and outputs a detection signal. When the detection signal is inputted from the current detection part 10, a control part 12 causes speakers 15a, 15b to output a warning sound.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an in-vehicle information device having an anti-theft mechanism.

  For example, Patent Document 1 describes a vehicle antitheft device attached to a dashboard of a vehicle. In this device, a control unit and an alarm that generates an alarm are attached to the back side of the dashboard, and an operation unit is attached to the dashboard. The operation unit and the control unit are connected by a control line that is partially exposed in the vehicle interior, and the control unit and the alarm device are connected by an alarm line. In this configuration, when the operation unit is moved and the control line is cut, the alarm device on the back side of the dashboard generates an alarm.

JP 2000-344054 A

In the prior art, the theft detection mechanism is exposed to the outside in some form, like the control line described in Patent Document 1, and the theft detection mechanism and the mounting structure of the device itself are irrelevant.
For this reason, there has been a problem that the theft detection mechanism may be invalidated by adding work from the outside. For example, in the apparatus described in Patent Document 1, the attachment structure of the operation unit and the control unit and the theft detection mechanism are irrelevant, and if both the operation unit and the control unit are removed while maintaining the connection by the control line, Can be carried outside the vehicle without sounding an alarm.
In addition, the conventional antitheft device often requires a dedicated output device such as a buzzer for generating an alarm, and in this case, there are always dimensional or cost restrictions for the output device.

  The present invention solves the above-described problems, and an object thereof is to obtain an in-vehicle information device in which a theft detection mechanism is difficult to understand.

  The in-vehicle information device according to the present invention includes a current detection unit and a control unit. The current detection unit is a dark current that is changed from a first current path formed when the in-vehicle information device is attached to the vehicle to a second current path different from the first current path by removing the in-vehicle information device. Is detected and a detection signal is output. When the control unit inputs a detection signal from the current detection unit, the control unit causes the output unit to output alarm information.

  According to the present invention, since the detection signal is output using the dark current whose current path has been changed by being removed from the vehicle, it is possible to realize an in-vehicle information device in which the theft detection mechanism is difficult to understand.

It is a figure which shows the outline | summary of the vehicle-mounted information apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the attachment to the dashboard of the vehicle-mounted information apparatus which concerns on Embodiment 1. FIG. 1 is a block diagram illustrating a configuration of an in-vehicle information device according to Embodiment 1. FIG. It is a figure which shows the electric current path in the attachment state of the vehicle-mounted information apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the electric current path in the removal state of the vehicle-mounted information apparatus which concerns on Embodiment 1. FIG.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an outline of an in-vehicle information device 1 according to Embodiment 1 of the present invention. In FIG. 1, it is described so that the internal configuration can be seen from the housing of the in-vehicle information device 1.
The in-vehicle information device 1 is an in-vehicle information device that is supplied with power from the battery 2 and performs various types of information processing. Further, a weak current of about several mA (hereinafter referred to as a dark current) flows through the in-vehicle information device 1 in order to retain data in the memory even when the power is off.
The current of the battery 2 is supplied from the positive terminal 2a to the circuit of the board 5 through the power cable 4a and the connector 3 and returns to the battery 2 through the return path having a low resistance value among the return paths B1 and B2.

The return path B1 corresponds to the second current path in the present invention, and is a current path from the connector 3 to the minus terminal 2b through the power cable 4b.
The return path B2 corresponds to the first current path in the present invention, and is a current path from the ground of the substrate 5 to the minus terminal 2b through the substrate mounting portions 6 and 7 and the vehicle ground.

  The board attachment portions 6 and 7 are conductive members that attach the board 5 in the housing of the in-vehicle information device 1. For example, the board attachment portion 6 is realized as a metal screw, and the board attachment portion 7 is realized as a metal boss that serves as a screw base. The ground of the substrate 5 is electrically connected to the substrate mounting portions 6 and 7.

FIG. 2 is a diagram illustrating attachment of the in-vehicle information device 1 according to the first embodiment to the dashboard. The in-vehicle information device 1 is attached to a dashboard attachment portion 100.
The connector 3a provided in the attachment part 100 is connected to the battery 2 via the power cables 4a and 4b shown in FIG. That is, the connector 3 a is one connector constituting the connector 3. A bracket 8 is attached to the casing of the in-vehicle information device 1.
The bracket 8 is formed of a conductive member such as a sheet metal, and is electrically connected to the board mounting portions 6 and 7 via the housing of the in-vehicle information device 1. Thereby, the ground of the substrate 5 is electrically connected to the bracket 8.

When attaching the in-vehicle information device 1 to the attachment unit 100, first, the connector 3 a is connected to the in-vehicle information device 1 and then inserted into the attachment unit 100. Thereafter, the bracket 8 is fixed to the attachment portion 100 with the screw 9 and then the decorative panels 101 and 102 are attached.
Note that the housing of the in-vehicle information device 1 may be directly fixed to the attachment portion 100 with the screw 9.
By mounting the in-vehicle information device 1 in this way, the ground of the substrate 5 is electrically connected to the vehicle ground via the substrate mounting portions 6 and 7, the housing, the bracket 8 and the screw 9.

  When detaching the in-vehicle information device 1 from the mounting portion 100, the procedure is such that after removing the decorative panels 101, 102, the screws 9 are removed, the in-vehicle information device 1 is pulled out, and the connector 3a is pulled out. Therefore, in a state where the in-vehicle information device 1 is removed, the return path B2 shown in FIG. 1 is cut, and the electrical connection between the ground of the substrate 5 and the vehicle ground is cut.

  In the present invention, when the vehicle information device 1 is attached, a dark current is caused to flow through the return path B2, and when the vehicle information device 1 is removed and the return path B2 is disconnected and the dark current changes the path to the return route B1, an alarm is output. As described above, since the theft detection mechanism and the mounting structure of the in-vehicle information device are associated with each other, it is difficult to add work from the outside, and the theft detection mechanism is difficult to be invalidated.

FIG. 3 is a block diagram showing the configuration of the in-vehicle information device 1 according to the first embodiment, and shows a case where the in-vehicle information device 1 is embodied as an audio integrated navigation device.
As shown in FIG. 3, the connector 3 a is connected to the connector 3 b provided in the in-vehicle information device 1 to connect the in-vehicle information device 1 and the battery 2.
The in-vehicle information device 1 includes a current detection unit 10, a power supply circuit 11, a control unit 12, a navigation circuit 13 and an audio circuit 14, and the ground of the substrate 5 is connected to the substrate attachment units 6 and 7, the bracket 8 and the screw 9. Connected to the vehicle ground.

The current detection unit 10 detects the dark current that has changed the path from the return path B2 formed when the in-vehicle information device 1 is attached to the vehicle to the return path B1 due to the removal of the in-vehicle information device 1. A detection signal from the current detection unit 10 is output to the control unit 12.
The power circuit 11 receives power from the battery 2 connected to the power cables 4 a and 4 b via the connector 3 and supplies power to the control unit 12, the navigation circuit 13, and the audio circuit 14.

The control unit 12 is a control unit that controls each operation of the navigation circuit 13 and the audio circuit 14. Further, as an operation peculiar to the present invention, when the detection signal is input from the current detection unit 10, the control unit 12 controls the navigation circuit 13 and the audio circuit 14 and outputs alarm information from the output unit such as the speakers 15a and 15b. Let
The navigation circuit 13 is a circuit that executes navigation processing such as map display, route search, route guidance, and the like. The audio circuit 14 is a circuit that outputs audio signals from the speakers 15a and 15b.

The navigation circuit 13 also functions as a voice output processing unit that generates voice guidance for route guidance. The voice output processing unit instructs the audio circuit 14 to output voice guidance from the speakers 15a and 15b.
Note that the speakers 15a and 15b are vehicle speakers that are standardly installed in the vehicle.

Next, the outline of theft detection in the present invention will be described by giving a specific example of the current detection unit 10.
FIG. 4 is a diagram illustrating a current path in the mounted state of the in-vehicle information device 1 according to the first embodiment. FIG. 5 is a diagram illustrating a current path in a detached state of the in-vehicle information device 1 according to the first embodiment. 4 and 5, the current detection unit 10 includes diodes D1 and D2 and a transistor TR.

In the diodes D1 and D2, the cathode terminal of the diode D1 is connected to the anode terminal of the diode D2, and the dark current flows through the return path B2 with the in-vehicle information device 1 attached to the vehicle, and the in-vehicle information device 1 is removed. And the dark current is arranged to flow in the return path B1.
That is, the cathode terminal of the diode D2 is connected to the minus terminal 2b of the battery 2 via the connector 3 and the power cable 4b, and the anode terminal of the diode D1 is connected to the minus terminal of the power circuit 11. Thereby, the diodes D1 and D2 are interposed in the middle of the return path B1.

  In the state where the vehicle-mounted information device 1 is attached to the vehicle, the current from the battery 2 is transferred from the plus terminal 2a to the plus terminal of the power circuit 11 through the power cable 4a and the connector 3 as shown by an arrow a in FIG. Flowing. And there are two paths returning from the negative terminal of the power supply circuit 11 to the battery 2, the return path B1 and the return path B2, and the return path B1 is a path where forward voltages of the diodes D1 and D2 are generated. For this reason, in a state where both the return path B1 and the return path B2 are connected, dark current flows only in the return path B2 as shown by an arrow b2 in FIG. 4, and the in-vehicle information device 1 is removed as shown by an arrow b1 in FIG. Only when the return path B2 is interrupted, the dark current flows through the return path B1.

The current detection unit 10 detects this when a current flows in the return path B1, that is, when the in-vehicle information device 1 is removed from the vehicle, and outputs a detection signal to the control unit 12. For example, the forward voltage of the diodes D1 and D2 is output to the control unit 12 as a detection signal. When dark current flows through the return path B2, the forward voltage is 0V. On the other hand, when the return path B2 is interrupted and dark current flows through the return path B1, if the forward voltages of the diodes D1 and D2 are 0.7V, the control unit 12 has 0.7 + 0.7 = 1.4V. A forward voltage is applied as a detection signal. Thereby, the control unit 12 can recognize the removal of the in-vehicle information device 1.
In this way, the current detection unit 10 can be realized only by adding inexpensive parts such as the diodes D1 and D2.

Further, for example, a bipolar transistor TR may be used for detecting the forward voltage of the diodes D1 and D2. In this case, the base terminal of the transistor TR is connected to the negative terminal of the power supply circuit 11 via the resistor R, the emitter terminal is connected to the cathode terminal of the diode D2, and the collector terminal is the detection signal input terminal of the control unit 12. Connect to.
When the return path B2 is interrupted and a dark current flows through the return path B1, a forward voltage is generated at both ends of the diodes D1 and D2, the transistor TR is turned on, and a detection signal is input to the control unit 12. Even if comprised in this way, the electric current detection part 10 is realizable only by adding cheap components, such as diode D1, D2, and transistor TR.
As a method for detecting the forward voltage of the diodes D1 and D2, a logic IC, a comparator, an A / D converter, or the like may be used in addition to the transistor.

When a detection signal is input from the current detection unit 10 to the control unit 12, the control unit 12 instructs the power supply circuit 11 to supply power to the navigation circuit 13 and the audio circuit 14.
Next, the control unit 12 instructs the navigation circuit 13 functioning as an audio output processing unit to generate alarm information. The alarm information may be an alarm sound such as a buzzer sound, or may be an alarm sound indicating that the in-vehicle information device 1 has been illegally removed from the vehicle.
The audio circuit 14 outputs the alarm information generated by the navigation circuit 13 from the speakers 15a and 15b. In this way, an alarm sound is emitted from the speakers 15a and 15b.

In many cases, a vehicle is normally equipped with a speaker that is used for outputting sound of in-vehicle information devices such as navigation devices and audio devices. Even with such a speaker, the sound can reach outside the vehicle depending on its volume.
Therefore, the control unit 12 uses the navigation circuit 13, the audio circuit 14, and the speakers 15a and 15b as alarm devices, so that it is not necessary to newly add a device dedicated to alarms. As a result, the dimensional or cost constraints caused by the addition of the dedicated device can be reduced.

In addition, when the in-vehicle information device 1 includes a communication processing unit that performs wireless communication with another communication device via a communication network, the control unit 12 instructs the communication processing unit to determine in advance. The alarm information may be transmitted to the notified device. For example, an e-mail with warning information indicating theft may be transmitted to a communication device having a predetermined address, and a synthesized sound of a warning sound is transmitted by connecting to a telephone with a predetermined telephone number. May be.
By doing so, it is possible to accurately tell the owner of the in-vehicle information device that the theft has been made.

Further, when the control unit 12 inputs a detection signal from the current detection unit 10, the situation when the in-vehicle information device 1 is removed from the drive recorder mounted on the vehicle may be recorded.
By configuring in this way, it is possible to recognize the situation such as the date and state when the in-vehicle information device is stolen from the recorded contents of the drive recorder, and it is possible to use this information for processing after the theft.

As described above, the in-vehicle information device 1 according to the first embodiment includes the current detection unit 10 and the control unit 12. The current detection unit 10 detects a dark current whose path has changed to the return path B1 due to the removal of the in-vehicle information apparatus 1 from the return path B2 formed when the in-vehicle information apparatus 1 is attached, and outputs a detection signal. When the control unit 12 receives a detection signal from the current detection unit 10, the control unit 12 outputs an alarm sound to the speakers 15a and 15b.
As described above, since the detection signal is output using the dark current whose current path is changed by removing the in-vehicle information device 1, the in-vehicle information device 1 in which the theft detection mechanism is difficult to be realized can be realized.

  In the in-vehicle information device 1 according to the first embodiment, when the control unit 12 inputs a detection signal from the current detection unit 10, the control unit 12 instructs the navigation circuit 13 or the audio circuit 14 to output alarm information from the speakers 15a and 15b. Let With this configuration, it is possible to reduce dimensional or cost restrictions caused by the addition of a dedicated device.

Furthermore, in the in-vehicle information device 1 according to the first embodiment, the current detection unit 10 includes a diode D1, which generates a forward voltage when the dark current path is changed to the return route B1 by removing the in-vehicle information device 1 from the return route B2. D2 is provided. When detecting the forward voltage of the diodes D1 and D2, the current detection unit 10 outputs the detection signal to the control unit 12 as a detection signal.
With such a configuration, the current detection unit 10 can be realized only by adding inexpensive components such as the diodes D1 and D2.

  Furthermore, in the in-vehicle information device 1 according to Embodiment 1, when the control unit 12 receives a detection signal from the current detection unit 10, the control unit 12 instructs the communication processing unit to transmit alarm information to a predetermined notification destination. By doing so, it is possible to accurately tell the owner of the in-vehicle information device that the theft has been made.

  Furthermore, in the in-vehicle information device 1 according to the first embodiment, when the control unit 12 inputs the detection signal from the current detection unit 10, the control unit 12 is configured to remove the in-vehicle information device 1 from the drive recorder mounted on the vehicle. Record the situation. By doing so, it is possible to recognize the situation such as the date and time when the in-vehicle information device is stolen from the recorded contents of the drive recorder, and it is possible to use such information for processing after the theft.

  In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

  1 onboard information device, 2 battery, 2a plus terminal, 2b minus terminal, 3, 3a, 3b connector, 4a, 4b power cable, 5 board, 6, 7 board mounting part, 8 bracket, 9 screw, 10 current detection part, DESCRIPTION OF SYMBOLS 11 Power supply circuit, 12 Control part, 13 Navigation circuit, 14 Audio circuit, 15a, 15b Speaker, 100 Mounting part, 101, 102 Cosmetic panel.

Claims (5)

Detecting a dark current that has changed from a first current path formed when an in-vehicle information device is attached to a vehicle to a second current path different from the first current path by removing the in-vehicle information device. A current detector that outputs a detection signal;
An in-vehicle information device comprising: a control unit that outputs alarm information to an output unit when a detection signal is input from the current detection unit. The output unit is a speaker mounted on a vehicle,
The control unit, when a detection signal is input from the current detection unit, instructs an audio output processing unit provided for the vehicle information device to output audio, and outputs alarm information from the speaker. The vehicle-mounted information device according to 1.   The current detection unit includes a diode that generates a forward voltage when a dark current path is changed to the second current path by removing an in-vehicle information device from the first current path. The in-vehicle information device according to claim 1, wherein a directional voltage is detected and output to the control unit as a detection signal.   The control unit, when receiving a detection signal from the current detection unit, instructs the communication processing unit to transmit alarm information to a predetermined notification destination. The in-vehicle information device according to any one of claims.   The said control part records the condition when the vehicle-mounted information apparatus was removed with respect to the drive recorder mounted in the vehicle, if a detection signal is input from the said electric current detection part. 4. The vehicle-mounted information device according to claim 1.

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