JP6523828B2 - In-vehicle information equipment - Google Patents

Description

  The present invention relates to an on-vehicle information device having an antitheft mechanism.

  For example, Patent Document 1 describes a vehicle anti-theft device attached to a dashboard or the like of a vehicle. In this device, a control unit and an alarm that generates an alarm are attached to the back 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 partially exposed in the vehicle compartment, and the control unit and the alarm are connected by an alarm line. In this configuration, when the operation unit is moved and the control line is disconnected, the alarm on the back of the dashboard generates an alarm.

Japanese Patent Laid-Open No. 2000-344054

In the prior art, as in the control line described in Patent Document 1, the theft detection mechanism is somehow exposed to the outside, and the theft detection mechanism and the attachment structure of the device itself are irrelevant.
For this reason, there has been a problem that theft detection mechanism may be invalidated by the addition of an external work. For example, in the device described in Patent Document 1, the attachment structure of the operation unit and the control unit and the detection mechanism of the theft are irrelevant, and if both the operation unit and the control unit are removed while maintaining the connection by the control line, It can be carried outside the vehicle without sounding an alarm.
In addition, conventional antitheft devices often require a dedicated output device such as a buzzer for generating an alarm, in which case dimensional or cost constraints have always occurred for the output device.

  The present invention is to solve the above-mentioned problems, and it is an object of the present invention to obtain an on-vehicle information device in which the detection mechanism of theft is difficult to realize.

An on-vehicle information device according to the present invention includes a current detection unit and a control unit. The current detection unit is configured such that when the in - vehicle information device is attached to the vehicle, the current supplied from the power supply to the in- vehicle information device flows to the ground of the vehicle. In the second current path which is returned to, the dark current whose path is changed is detected by disconnecting the electrical connection between the in-vehicle information device and the ground of the vehicle by removing the in- vehicle information device, and a detection signal is output. When the control unit receives the 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 changed due to removal from the vehicle, it is possible to realize the on-vehicle information device in which the detection mechanism of the theft is difficult to realize.

It is a figure which shows the outline | summary of the vehicle-mounted information apparatus based on Embodiment 1 of this invention. FIG. 6 is a diagram showing the attachment of the in-vehicle information device according to Embodiment 1 to a dashboard. FIG. 1 is a block diagram showing a configuration of an on-vehicle information device according to Embodiment 1. FIG. 6 is a diagram showing a current path in the mounted state of the in-vehicle information device according to the first embodiment. FIG. 7 is a diagram showing a current path in a detached state of the in-vehicle information device according to the first embodiment.

Embodiment 1
FIG. 1 is a view showing an outline of an on-vehicle information device 1 according to Embodiment 1 of the present invention. In FIG. 1, it is shown that the internal configuration can be seen from the case of the on-vehicle information device 1.
The on-vehicle information device 1 is an on-vehicle information device that is supplied with power from the battery 2 and performs various information processing, and can be embodied by, for example, a navigation device, an audio device, and the like. Also, in the on-vehicle information device 1, a weak current of about several mA (hereinafter referred to as dark current) flows to hold 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 substrate 5 in the forward path A passing through the power cable 4a and the connector 3 and returns to the battery 2 through the return path with low resistance among return paths B1 and B2.

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

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

FIG. 2 is a diagram showing the attachment of the in-vehicle information device 1 according to the first embodiment to a dashboard. The in-vehicle information device 1 is attached to the attachment portion 100 of the dashboard.
The connector 3a provided in the mounting portion 100 is connected to the battery 2 via the power supply cables 4a and 4b shown in FIG. That is, the connector 3 a is one of the connectors constituting the connector 3. A bracket 8 is attached to the housing 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 attachment parts 6 and 7 through the housing of the on-vehicle information device 1. Thus, the ground of the substrate 5 is conducted to the bracket 8.

When the in-vehicle information device 1 is attached to the attachment portion 100, first, the connector 3a is connected to the in-vehicle information device 1 and then inserted into the attachment portion 100. After this, after fixing the bracket 8 to the attachment portion 100 with the screw 9, it becomes a procedure of attaching the decorative panels 101 and 102.
Alternatively, the housing of the in-vehicle information device 1 may be fixed to the mounting portion 100 directly with the screws 9.
By mounting the on-vehicle information device 1 in this manner, 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 removing the in-vehicle information device 1 from the mounting portion 100, after removing the cosmetic panels 101 and 102, the screw 9 is removed, the in-vehicle information device 1 is pulled out, and the connector 3a is removed. Therefore, when the in-vehicle information device 1 is removed, the return path B2 shown in FIG. 1 is disconnected, and the electrical connection between the ground of the substrate 5 and the vehicle ground is disconnected.

  In the present invention, when the in-vehicle information device 1 is attached, a dark current is supplied to the return path B2, and when the in-line information device 1 is removed and the return path B2 is disconnected and the dark current changes in the return path 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 a work from the outside, and the theft detection mechanism is hard 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 engaged with 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 on-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. The substrate 5 is grounded by attaching the substrate attachment units 6, 7 and the bracket 8 and screw 9 It is connected to the vehicle ground via

The current detection unit 10 detects a dark current whose path is changed to the return route B1 by removing the on-vehicle information device 1 from the return route B2 formed when the on-vehicle information device 1 is attached to the vehicle. A detection signal from the current detection unit 10 is output to the control unit 12.
The power supply circuit 11 receives power from the battery 2 connected to the power supply 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 unique to the present invention, the control unit 12 controls the navigation circuit 13 and the audio circuit 14 to output alarm information from an output unit such as the speakers 15a and 15b when a detection signal is input from the current detection unit 10. Let
The navigation circuit 13 is a circuit that executes navigation processing such as map display, route search, and route guidance. The audio circuit 14 is a circuit that causes an audio signal to be output from the speakers 15a and 15b.

The navigation circuit 13 also functions as an audio output processing unit that generates audio guidance of route guidance. The audio output processing unit instructs the audio circuit 14 to output audio guidance from the speakers 15a and 15b.
Loudspeakers 15a and 15b are vehicle speakers that are normally equipped in a vehicle.

Next, an outline of the theft detection in the present invention will be described by taking a specific example of the current detection unit 10.
FIG. 4 is a diagram showing a current path in the mounted state of the in-vehicle information device 1 according to the first embodiment. FIG. 5 is a diagram showing a current path in the removed state of the in-vehicle information device 1 according to the first embodiment. In FIGS. 4 and 5, the current detection unit 10 is configured to include 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, dark current flows through the return path B2 in a state where the in-vehicle information device 1 is attached to the vehicle, and the in-vehicle information device 1 is removed And dark current are arranged to flow to the return path B1.
That is, the cathode terminal of the diode D2 is connected to the negative terminal 2b of the battery 2 via the connector 3 and the power supply cable 4b, and the anode terminal of the diode D1 is connected to the negative terminal of the power supply circuit 11. Thus, the diodes D1 and D2 are interposed in the middle of the return path B1.

  When the vehicle 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 supply circuit 11 through the power cable 4a and the connector 3 as shown by arrow a in FIG. Flow. There are two paths from the minus terminal of the power supply circuit 11 back to the battery 2: return path B1 and return path B2, but the return path B1 is a path for generating forward voltages of the diodes D1 and D2. For this reason, in a state where both the return path B1 and the return path B2 are connected, the dark current flows only to the return path B2 as shown by the arrow b2 in FIG. 4 and the on-vehicle information device 1 is removed as shown by the arrow b1 in FIG. The dark current flows in the return path B1 only when the return path B2 is cut off.

The current detection unit 10 detects a current flowing through the return path B1, that is, when the on-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 in the return path B2, the forward voltage is 0V. On the other hand, when the return path B2 is cut off and the dark current flows through the return path B1, if the forward voltage of each of the diodes D1 and D2 is 0.7 V, the control unit 12 calculates 0.7 + 0.7 = 1.4 V 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.
Thus, the current detection unit 10 can be realized only by adding inexpensive components such as the diodes D1 and D2.

Further, for example, a bipolar transistor TR may be used to detect 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 through 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 controller 12. Connect to
When the return path B2 is cut off and a dark current flows through the return path B1, 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 with this configuration, the current detection unit 10 can be realized only by adding inexpensive components such as the diodes D1 and D2 and the transistor TR.
In addition, as a method of detecting the forward voltage of the diodes D1 and D2, for example, a logic IC, a comparator, an A / D converter, or the like may be used other than 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 on-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. Thus, the alarm sound is emitted from the speakers 15a and 15b.

In many cases, a vehicle is usually equipped with a speaker used for audio output of in-vehicle information devices such as navigation devices and audio devices. Even with such a speaker, depending on the volume of the speaker, the sound can be transmitted outside the vehicle.
Therefore, the control unit 12 uses the navigation circuit 13, the audio circuit 14, and the speakers 15a and 15b as an alarm, so that it is not necessary to newly add an alarm-dedicated device. This can alleviate the dimensional or cost constraints that arise from the addition of dedicated devices.

Further, when the on-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 of warning information indicating that the phone has been stolen may be transmitted to a communication device of a predetermined address, and it is connected to a telephone of a predetermined telephone number to transmit a synthesized sound of a warning voice. You may
By doing this, it is possible to accurately inform the owner of the in-vehicle information device of the theft.

Furthermore, when the control unit 12 receives a detection signal from the current detection unit 10, the control unit 12 may record the situation when the in-vehicle information device 1 is removed from the drive recorder mounted on the vehicle.
By this configuration, it is possible to recognize the status such as the date and time of the theft of the in-vehicle information device from the recorded contents of the drive recorder, and to use the information for post-theft processing.

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

  In the on-vehicle information device 1 according to the first embodiment, when the control unit 12 receives 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 Such a configuration can reduce the dimensional or cost constraints that arise from the addition of a dedicated device.

Furthermore, in the on-vehicle information device 1 according to the first embodiment, the current detection unit 10 generates the forward voltage from the diode D1, which generates the forward voltage when the path of the dark current changes to the return passage B1 due to the removal of the on-vehicle information device 1 from the return passage B2. It has D2. When detecting the forward voltage of the diodes D1 and D2, the current detection unit 10 outputs the detection voltage to the control unit 12 as a detection signal.
With this configuration, the current detection unit 10 can be realized simply by adding inexpensive components such as the diodes D1 and D2.

  Furthermore, in the on-vehicle information device 1 according to the first embodiment, when the detection signal is input 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 this, it is possible to accurately inform the owner of the in-vehicle information device of the theft.

  Furthermore, in the on-vehicle information device 1 according to the first embodiment, when the control unit 12 receives a detection signal from the current detection unit 10, the on-vehicle information device 1 is removed from the drive recorder mounted on the vehicle. Record the situation. By doing this, it is possible to recognize the conditions such as the date and time when the in-vehicle information device was stolen from the recorded contents of the drive recorder, and to use these information for post-theft processing.

  In the present invention, within the scope of the invention, modification of any component of the embodiment or omission of any component of the embodiment is possible.

  1 in-vehicle information device, 2 battery, 2a positive terminal, 2b minus terminal, 3, 3a, 3b connector, 4a, 4b power cable, 5 substrates, 6, 7 substrate mounting portion, 8 bracket, 9 screw, 10 current detection portion, 11 power supply circuit 12 control unit 13 navigation circuit 14 audio circuit 15a, 15b speaker 100 mounting unit 101, 102 cosmetic panel.

Claims (5)

When a vehicle-mounted information device is attached to a vehicle, the current supplied from the power supply to the vehicle-mounted information device flows to the ground of the vehicle, and the current supplied from the power supply to the vehicle-mounted information device is the power supply In the second current path, the detection signal is output by detecting the dark current whose path has been changed by disconnecting the electrical connection between the on-board information device and the ground of the vehicle by removing the on- vehicle information device. Current detection unit,
And a controller configured to output 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.
When the control unit inputs a detection signal from the current detection unit, the control unit instructs an audio output processing unit with which the in-vehicle information device is equipped to output a sound, and causes the speaker to output alarm information. The vehicle-mounted information apparatus of 1 statement.   The current detection unit includes a diode that generates a forward voltage when the dark current path is changed to the second current path by removing the in-vehicle information device from the first current path, and the forward direction of the diode The on-vehicle information device according to claim 1 or 2, wherein a direction voltage is detected and output as a detection signal to the control unit.   The control unit instructs the communication processing unit to transmit alarm information to a predetermined notification destination when a detection signal is input from the current detection unit. The in-vehicle information device according to any one of the items.   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 the detection signal is input from the said electric current detection part, The 1st aspect is characterized by the above-mentioned. The in-vehicle information device according to any one of the items 4).

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