JP2008068738A - In-vehicle system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle system capable of easily detecting any theft even if a plurality of in-vehicle devices are mounted to a vehicle, and allowing the easy installation of the in-vehicle devices. <P>SOLUTION: In the in-vehicle system 100 comprising a plurality of instruments such as an acoustic instrument body 1, an antitheft device 2 and external connection instruments 3, 4, the plurality of instruments are successively connected to each other in series. Each instrument has a function of detecting the connection state of the adjacent instruments and outputting the result of the detection. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle system including a plurality of devices mounted on a vehicle.

2. Description of the Related Art Conventionally, there is an anti-theft device that detects theft of an in-vehicle navigation device, and an anti-theft device that detects the theft of an in-vehicle navigation device by mounting the anti-theft device on a vehicle is known (see, for example, Patent Document 1). ).
JP 2004-136737 A

  By the way, when a plurality of in-vehicle devices are mounted on the vehicle, the plurality of in-vehicle devices are respectively connected to the anti-theft device, so that the connection work is complicated. Moreover, since the anti-theft device on the vehicle side must detect the theft for all of the plurality of in-vehicle devices, there is a problem that the configuration of the anti-theft device on the vehicle side becomes complicated.

  Therefore, an object of the present invention is to make it possible to easily detect a theft even when a plurality of in-vehicle devices are mounted on a vehicle, and to easily install the in-vehicle devices.

  In order to solve the above-described problems, the present invention provides a vehicle-mounted system including a plurality of vehicle-mounted devices, wherein the plurality of vehicle-mounted devices are sequentially connected in series, and each of the vehicle-mounted devices is connected to the adjacent vehicle-mounted device. An in-vehicle system comprising: a detecting unit that detects an abnormality in a connection state; and an output unit that outputs a detection result by the detecting unit.

  According to the present invention, a plurality of in-vehicle devices connected in series sequentially detect an abnormality in the connection state of adjacent on-vehicle devices, and output a detection result. As a result, when any on-vehicle device is unintentionally removed, that is, when it is stolen, this can be detected quickly, so that an alarm operation such as outputting an alarm sound based on the detection result can be performed. . And when installing this vehicle-mounted system, since a vehicle-mounted apparatus should just be connected in series, installation work is easy. For example, when connecting a plurality of devices in a one-to-many manner with respect to one main device, it is necessary to route wiring etc. to a device located away from the main device, and the main device includes a plurality of devices extending to a plurality of devices. Wiring etc. must be connected, but in the configuration of the present invention, only the wiring etc. for connecting each in-vehicle device to the adjacent in-vehicle device is required, so there is a burden of work related to connection work and routing of wiring etc. It is greatly reduced. Therefore, even if a plurality of in-vehicle devices are mounted on the vehicle, the theft can be easily detected, and the in-vehicle devices can be easily installed.

In the present invention, a detection line is disposed between two adjacent on-vehicle devices, and the on-vehicle device includes voltage supply means for applying a predetermined voltage to the detection line, and the detection means May be configured to detect an abnormality in the connection state of the in-vehicle devices connected via the detection line based on the voltage of the detection line.
In this case, by detecting the voltage of the detection line provided between the adjacent on-vehicle devices, it is possible to reliably detect an abnormality in the connection state with an extremely simple configuration.

In the present invention, among the plurality of in-vehicle devices that are sequentially connected in series, all the in-vehicle devices except for the in-vehicle device at one end may include the voltage supply unit.
In this case, even if the number of in-vehicle devices increases, it is only necessary to connect in-vehicle devices in series so as to extend the row of in-vehicle devices starting from the one-side in-vehicle device that does not have voltage supply means. In-vehicle devices can be easily connected, and the configuration can be easily changed.

  Further, the present invention provides an in-vehicle system configured by mounting a control device, a plurality of controlled devices that operate according to the control of the control device, and an anti-theft device on a vehicle, and the anti-theft device is included in the control device. A plurality of controlled devices are sequentially connected in series to the anti-theft device, and the anti-theft device and each of the controlled devices detect an abnormal connection state of the adjacent controlled devices. An in-vehicle system comprising: a detecting means for detecting, wherein the anti-theft device comprises an alarm means for outputting an alarm based on a detection result of the detecting means provided by itself and a detection means provided in the controlled device. I will provide a.

  According to the present invention, in an in-vehicle system configured by mounting a control device, a plurality of controlled devices that operate according to the control of the control device, and an anti-theft device on a vehicle, a plurality of serially connected devices The controlled device and the anti-theft device each detect an abnormality in the connection state of the adjacent controlled devices, and the anti-theft device outputs an alarm based on the detection result. As a result, when any one of the controlled devices is unintentionally removed, that is, when it is stolen, this can be detected quickly and an alarm can be output. And when installing this vehicle-mounted system, since a control apparatus, a theft prevention apparatus, and a several to-be-controlled device should just be connected in series, installation work is easy. For example, when connecting a plurality of devices in a one-to-many manner with respect to one main device, it is necessary to route wiring etc. to a device located away from the main device, and the main device includes a plurality of devices extending to a plurality of devices. Wiring etc. must be connected, but in the configuration of the present invention, since there is only a wiring etc. for connecting the anti-theft device and a plurality of controlled devices in series starting from the control device, connection work, wiring etc. The burden of work related to the handling of the is greatly reduced. Therefore, even when a large number of devices are included, an in-vehicle system that can easily detect theft and can be easily installed can be realized. In addition, since the anti-theft device different from the control device is provided and the anti-theft device outputs an alarm, the alarm can be reliably output even when both the control device and the controlled device are stopped.

In this invention, the said control apparatus is good also as a structure provided with the detection means which detects the abnormality of the connection state of the said antitheft device, and the alarm means which outputs a warning based on the detection result by this detection means.
In this case, the control device can detect an abnormality in the connection state of the anti-theft device, that is, the theft and output an alarm, and can reliably cope with the theft of the anti-theft device itself.

  According to the present invention, theft can be easily detected even when a plurality of in-vehicle devices are mounted on a vehicle, and the in-vehicle devices can be easily installed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an in-vehicle system 100 according to an embodiment to which the present invention is applied.
This in-vehicle system 100 includes an in-vehicle device including an audio device main body 1 as a control device mounted on a vehicle and external connection devices 3 and 4 as controlled devices that operate under the control of the audio device main body 1. An acoustic system that reproduces and outputs music in the passenger compartment. The in-vehicle system 100 has a function of outputting an alarm when each device such as the externally connected devices 3 and 4 constituting the in-vehicle system 100 is removed by the anti-theft device 2 as the in-vehicle device.

  The audio device main body 1 is a main body of the in-vehicle audio apparatus, and outputs sound from the speaker 8 based on a built-in sound source (not shown) such as a tuner or audio signals input from the external connection devices 3 and 4. The external connection devices 3 and 4 are a CD changer device, a DVD player, or the like, and operate under the control of the audio device main body 1 to output an audio signal to the audio device main body 1. The antitheft device 2 outputs an alarm sound from the speaker 9 when an abnormality occurs in the connection state of the externally connected devices 3 and 4 while the operation of the audio device main body 1 is stopped.

  The devices constituting the in-vehicle system 100 are sequentially connected in series so as to form a so-called daisy chain via a communication line. Specifically, the anti-theft device 2 is connected to the audio equipment body 1 via the communication line 5, the external connection device 3 is connected to the anti-theft device 2 via the communication line 6, and An external connection device 4 is connected to the connection device 3 via a communication line 7. Control information, audio signals, and the like are transmitted and received via the communication line 6.

In addition, the in-vehicle system 100 is provided with an activation command signal line 10 as a detection line extending from the audio device main body 1 to the anti-theft device 2 and the external connection devices 3 and 4.
Furthermore, a DC power supply of about 12 to 14 volts is supplied from the vehicle via the power supply line 20 to the audio device main body 1, the anti-theft device 2, and the external connection devices 3 and 4 constituting the in-vehicle system 100. Is done. The power line 20 is a so-called constant power line, and supplies power regardless of the operation state of the vehicle.

FIG. 2 is a diagram showing the configuration of the in-vehicle system 100 in more detail.
The acoustic device main body 1 includes a microprocessor 11, and executes operations such as control of the external connection devices 3 and 4 and sound reproduction based on a sound signal according to the control of the microprocessor 11.
The audio device main body 1 includes an operation unit (not shown). When an operation for turning on / off the power is performed in the operation unit, the built-in switch 21 is turned on / off in response to the operation. The switch 21 is a switch connected to the activation command signal line 10, and a current flows from the activation command signal line 10 to the audio equipment body 1 when the switch 21 is turned on (conductive state).
The audio equipment body 1 also includes a voltage detection unit 15 that is connected to the activation command signal line 10 and detects the voltage of the activation command signal line 10.

  The anti-theft device 2 includes a microprocessor 12, and monitors the connection state of the externally connected devices 3 and 4 when the audio device body 1 is stopped (not operating) according to the control of the microprocessor 12. The antitheft device 2 also includes a voltage detection unit 16 that is connected to the activation command signal line 10 and detects the voltage of the activation command signal line 10.

  The externally connected devices 3 and 4 have built-in microprocessors 13 and 14, respectively, and execute operations such as CD reproduction and DVD reproduction under the control of the microprocessors 13 and 14. The externally connected devices 3 and 4 include voltage detection units 17 and 18 that are connected to the activation command signal line 10 and detect the voltage of the activation command signal line 10, respectively.

Furthermore, each device of the anti-theft device 2 and the external connection devices 3 and 4 includes switches 22, 23 and 24.
The switches 22, 23, and 24 are switches that connect the power supply line 20 and the activation command signal line 10, respectively, and are linked to ON / OFF of the switch 21 built in the audio equipment body 1. That is, when the switch 21 is turned on and a current flows from the activation command signal line 10 to the audio device main body 1, the switches 22, 23 and 24 are all turned on. When the switch 21 is turned off, the switches 22 and 23 are turned on. , 24 are switched off.

The switch 22 functions as a power switch for the anti-theft device 2. When the switch 22 is on, power is supplied from the power line 20 to the antitheft device 2 via the switch 22. Since the anti-theft device 2 monitors the connection state of the externally connected devices 3 and 4 when the audio device main body 1 is stopped (not operating), the operation start / stop of the audio device main body 1, that is, the switch 22 The monitoring operation is stopped / started with turning on / off.
The switches 23 and 24 function as power switches for the externally connected devices 3 and 4, and the externally connected devices 3 and 4 start / stop operation according to the on / off of the switches 23 and 24.
However, since these switches 23 and 24 are switches for switching start / stop of normal operation (CD playback or the like) of each device, even if the switches 23 and 24 are off, the microprocessors 13 and 14 and the voltage detection unit 16 and 17 are operable. In addition, the microprocessor 12 and the voltage detection unit 15 of the antitheft device 2 are operable because the monitoring operation is being performed with the switch 22 turned off.

On the start command signal line 10, a diode 31 is provided between the switch 22 and the switch 23, and a diode 32 is provided between the switch 23 and the switch 24. The diode 31 is arranged in such a direction that the switch 22 is on the cathode side and the diode 32 is on the switch 23 on the cathode side. In the external connection device 4, a diode 33 is connected to the far end of the switch 24.
And the voltage detection part 15 which the audio equipment main body 1 has is connected to the cathode side of the diode 31, the voltage detection part 16 of the antitheft device 2 is connected to the cathode side of the diode 32, and the voltage detection part 17 of the external connection device 3. Is connected to the cathode side of the diode 33.

  For this reason, when the switch 22 is on, a current flows from the power supply line 20 to the cathode side of the diode 31. Similarly, when the switch 23 is on, a current flows to the cathode side of the diode 32, and when the switch 24 is on, a current flows from the power supply line 20 to the cathode side of the diode 33.

On the other hand, when the switch 22 is off, the cathode side of the diode 31 is connected to the power supply line 20 via the resistor 25. For this reason, the voltage of the start command signal line 10 becomes a predetermined voltage that is dropped from the power supply line 20 by the resistor 25.
Similarly, the cathode side of the diode 32 is connected to the power supply line 20 via the resistor 26 when the switch 23 is off, and the cathode side of the diode 33 is connected via the resistor 27 when the switch 24 is off. 20. For this reason, the voltage of the start command signal line 10 is kept at a predetermined voltage with the switches 23 and 24 being OFF.

  When the sound device main body 1 is instructed to stop its operation by operating an operation unit (not shown), the switch 21 is turned off to stop the operation. Here, in conjunction with the switch 21, when the switches 22, 23, 24 as voltage supply means are turned off, the antitheft device 2 starts the monitoring operation, while the externally connected devices 3, 4 stop the operation. Accordingly, the start command signal line 10 is connected to the power supply line 20 via the resistors 25, 26, and 27. The voltage of the start command signal line 10 at this time is hereinafter referred to as a high voltage.

  As described above, since the switch 22 is connected to the cathode side of the diode 31, even if the switch 22 is turned off, the voltage on the anode side (that is, the external device 3 side) of the diode 31 is not affected. Only on the cathode side of the diode 31, the voltage of the start command signal line 10 becomes a high voltage. Similarly, since the switch 23 is connected to the cathode side of the diode 32, even if the switch 23 is turned off, the voltage on the anode side of the diode 32 (that is, the external connection device 4 side) is not affected. The voltage of the start command signal line 10 becomes higher on the cathode side than 32. Further, since the switch 24 is connected to the cathode side of the diode 33, even if the switch 24 is turned off, the voltage on the anode side of the diode 33 is not affected, and the start command is issued only on the cathode side of the diode 33. The voltage of the signal line 10 becomes a high voltage.

  For this reason, when the switch 22 is OFF, the voltage detector 15 detects a high voltage. Further, when the switch 23 is off, the voltage detector 16 detects a high voltage, and when the switch 24 is off, the voltage detector 17 detects a high voltage.

  When the switch 21 is turned on, the switches 22, 23, and 24 are turned on in conjunction with this, and the voltage of the start command signal line 10 is higher than the above high voltage because the switch 21 is conductive. Low voltage. Therefore, while the switch 21 is on, the voltage value detected by the voltage detectors 15, 16, and 17 is lower than the high voltage.

  Thus, in the state where the switch 21 is switched off, a high voltage is detected in all of the voltage detection units 15, 16, and 17. Here, when a voltage value lower than the high voltage is detected by any one of the voltage detection units 15, 16, and 17, this means that the connection between the anti-theft device 2 and the external connection devices 3 and 4 has been disconnected. . Therefore, it is possible to detect whether or not the anti-theft device 2 and the externally connected devices 3 and 4 are connected based on the voltage values detected by the voltage detectors 15, 16 and 17.

In the configuration of the in-vehicle system 100 shown in FIGS. 1 and 2, the external connection device 4 is connected to the end. For this reason, the voltage detection unit 18 included in the external connection device 4 is connected to the end of the activation command signal line 10 on the anode side of the diode 33, and thus does not detect a high voltage.
Here, another device having the same configuration as the external connection devices 3 and 4 can be connected to the external connection device 4 to extend the daisy chain. In this case, the other device is connected to the start command signal line 10 on the anode side of the diode 33, and the connection state of the other device is determined based on whether or not the high voltage is detected by the voltage detection unit 18. Can be detected.

  In the configuration shown in FIGS. 1 and 2, the microprocessor 11 included in the audio equipment main body 1 and the microprocessor 12 included in the antitheft device 2 are connected via a communication line 5 so as to be able to communicate with each other. Similarly, the microprocessor 12 included in the anti-theft device 2 and the microprocessor 13 included in the external connection device 3 are connected to each other via the communication line 6 so that they can communicate with each other, and are externally connected to the microprocessor 13 included in the external connection device 3. The microprocessor 14 included in the device 4 is connected to be able to communicate with each other via the communication line 7.

  With this configuration, the microprocessors 11 to 14 communicate control information, audio signals, and the like with the microprocessors connected via the communication line, and control information between the microprocessors at remote locations. Audio signals etc. can be relayed. For example, when transmitting control information and audio signals from the microprocessor 14 to the microprocessor 11, the control information and audio signals output from the microprocessor 14 are sequentially transmitted and received by the microprocessors 13 and 12 and input to the microprocessor 11. Is done.

  Therefore, when the microprocessor 13 included in the externally connected device 3 detects that the externally connected device 4 is not connected based on the voltage detected by the voltage detection unit 17, the externally connected device is connected to the microprocessor 12. 4 connection state abnormality can be notified. Further, the microprocessor 11 detects an abnormality in the connection state of the antitheft device 2 based on the voltage detected by the voltage detection unit 15, and the microprocessor 12 has the voltage value detected by the voltage detection unit 16. In addition, an abnormality in the connection state of the external device 3 is detected. For this reason, if an abnormality occurs in the connection state of either the antitheft device 2 or the externally connected devices 3, 4, this can be quickly detected by the microprocessors 11, 12.

Further, the communication line 5, the activation command signal line 10, and the power supply line 20 that straddle the acoustic device main body 1 and the anti-theft device 2 can be bundled to form a single cable. Similarly, a communication line 6 disposed across the anti-theft device 2 and the external connection device 3, a start command signal line 10 and a power line 20, a communication line 7 straddling the external connection device 3 and the external connection device 4, The start command signal line 10 and the power supply line 20 can be bundled to form one cable.
In this case, the in-vehicle system 100 can be constructed by connecting each device in series while being connected by a single cable, and the installation work in the vehicle is very easy.

Hereinafter, the operation in the in-vehicle system 100 will be described.
FIG. 3 is a flowchart showing the operation of the audio device main body 1, and particularly shows the operation related to theft prevention. In the operation shown in FIG. 3, the microprocessor 11 functions as a detection unit together with the voltage detection unit 15 and also functions as an alarm unit together with the speaker 8.
When a switch operation by an operation unit (not shown) is performed in the audio equipment main body 1 (step S11), the microprocessor 11 determines whether the switch operation is an instruction to turn on the power or an instruction to turn off the power (step S11). S12).
Here, when the power-on is instructed (step S12; No), the microprocessor 11 switches on the switch 21 (step S13). Along with this, the switches 22, 23, and 24 are turned on.

  Subsequently, the microprocessor 11 checks whether or not an adjacent device (theft prevention device 2) is connected to the audio device main body 1 (step S14), and if it is connected (step S15; Yes). ), The value of the connection confirmation flag is set to 1 and stored (step S16), and the process returns to step S11. If the anti-theft device 2 is not connected (step S15; No), the microprocessor 11 sets the value of the connection confirmation flag to 0 and stores it (step S17), and returns to step S11.

  On the other hand, when power-off is instructed by a switch operation in the operation unit (step S12; Yes), the microprocessor 11 switches the switch 21 to off (step S18), and the voltage detection unit 15 causes the start command signal line 10 to be turned off. The voltage is detected (step S19). If the high voltage is detected (step S20; Yes), the microprocessor 11 returns to step S19 and continues to monitor the voltage of the start command signal line 10.

  Here, when the voltage detected by the voltage detector 15 is not a high voltage (step S20; No), the microprocessor 11 determines whether or not the value of the stored connection confirmation flag is 1 ( Step S21). If the value of the connection confirmation flag is 0 (step S21; No), since the antitheft device 2 is not originally connected, the microprocessor 11 returns to step S11. Here, if the value of the connection confirmation flag is 1, it indicates that the anti-theft device 2 is connected but is not currently connected. The microprocessor 11 shifts to the theft detection state (step S22) and outputs an alarm sound from the speaker 8 (step S23).

  Thus, the audio equipment main body 1 confirms the presence / absence of the anti-theft device 2 while the power is on, and sets the value of the connection confirmation flag corresponding to the presence / absence. Then, based on the voltage of the start command signal line 10 and the value of the connection confirmation flag, an abnormality in the connection state of the antitheft device 2 is detected and an alarm is output. Thereby, the abnormality of the connection state of the antitheft device 2, that is, the theft, can be reliably detected and an alarm can be output.

FIG. 4 is a flowchart showing the operation of the external connection device 3, and particularly shows the operation related to theft prevention. In the operation shown in FIG. 4, the microprocessor 13 functions as a detection unit together with the voltage detection unit 17 and also functions as an output unit.
When the switch 23 is on (step S31; No), the microprocessor 13 included in the externally connected device 3 checks whether an adjacent device (externally connected device 4) is connected (step S32). Here, when the external device 4 is connected (step S33; Yes), the microprocessor 13 sets the value of the connection confirmation flag to 1 (step S34), and returns to step S31. If the external device 4 is not connected (step S33; No), the microprocessor 13 sets the value of the connection confirmation flag to 0 (step S35), and returns to step S31.

  On the other hand, when the switch 23 is off (step S31; Yes), the microprocessor 13 causes the voltage detection unit 17 to detect the voltage of the activation command signal line 10 (step S36). If the above high voltage is detected (step S37; Yes), the microprocessor 13 returns to step S36 and continues to monitor the voltage of the start command signal line 10.

  When the voltage detected by the voltage detector 17 is not a high voltage (step S37; No), the microprocessor 13 determines whether or not the value of the stored connection confirmation flag is 1 (step S38). . If the value of the connection confirmation flag is 0 (step S38; No), the microprocessor 13 returns to step S31. Here, if the value of the connection confirmation flag is 1, it indicates that the externally connected device 4 is not currently connected although it is connected. Therefore, the microprocessor 13 shifts to a theft detection state (step S39), and outputs control information indicating an abnormality in the connection state of the external connection device 4 to the microprocessor 12 of the antitheft device 2 (step S40). ).

  As described above, when another device is connected to the end of the external connection device 4, the external connection device 4 performs the operation shown in FIG. In this case, control information output from the microprocessor 14 of the external connection device 4 to the microprocessor 12 is relayed by the microprocessor 13.

  As described above, the externally connected device 3 confirms the presence or absence of the externally connected device 4 while the power is on, and sets the value of the connection confirmation flag corresponding to the presence or absence. Then, the abnormality of the connection state of the external connection device 4 is detected based on the voltage of the activation command signal line 10 and the value of the connection confirmation flag, and notifies the antitheft device 2 that the theft has been detected.

FIG. 5 is a flowchart showing the operation of the anti-theft device 2, and particularly shows the operation related to anti-theft. In the operation shown in FIG. 5, the microprocessor 12 functions as a detection unit together with the voltage detection unit 16 and also functions as an alarm unit together with the speaker 9.
When the switch 22 is on (Step S51; No), the microprocessor 12 included in the anti-theft device 2 checks whether an adjacent device (external connection device 3) is connected (Step S52). If the external device 3 is connected (step S53; Yes), the microprocessor 12 sets the value of the connection confirmation flag to 1 and stores it (step S54), and returns to step S51. If the external device 3 is not connected (step S53; No), the microprocessor 12 sets the value of the connection confirmation flag to 0 (step S55), and returns to step S51.

On the other hand, when the switch 22 is off (step S51; Yes), the antitheft device 2 performs a monitoring operation.
During this monitoring operation, the microprocessor 12 determines whether or not the microprocessor 13 has been notified that the theft has been detected (step S56). When notified, the microprocessor 12 proceeds to step S60 described later, and when not notified, proceeds to step S57.
In step S57, the microprocessor 12 causes the voltage detection unit 16 to detect the voltage of the activation command signal line 10 (step S57). When the high voltage is detected (step S58; Yes), the microprocessor 12 returns to step S56, and continues to determine whether or not there is a notification and monitor the voltage of the start command signal line 10.

  If the voltage detected by the voltage detector 16 is not a high voltage (step S58; No), the microprocessor 12 determines whether or not the value of the stored connection confirmation flag is 1 (step S58). S59). If the value of this connection confirmation flag is 0 (step S59; No), the microprocessor 12 returns to step S51. Here, if the value of the connection confirmation flag is 1, it indicates that the externally connected device 3 is not currently connected although it is connected. Therefore, the microprocessor 12 proceeds to step S60, enters a theft detection state, and outputs an alarm from the speaker 9 (step S61).

  In this way, the anti-theft device 2 confirms the presence / absence of the externally connected device 3 while the power is on, and sets the value of the connection confirmation flag corresponding to the presence / absence thereof. Based on the voltage of the start command signal line 10 and the value of the connection confirmation flag, an abnormality in the connection state of the external device 3 is detected and an alarm is output. At the same time, the antitheft device 2 outputs an alarm based on the notification from the externally connected device 3 when the externally connected device 3 detects the theft of the externally connected device 4. Thereby, the antitheft device 2 can reliably detect the theft of the external connection device 3 and the external connection device 4 and output an alarm.

  As described above, in the in-vehicle system 100 according to the embodiment to which the present invention is applied, the audio device main body 1, the antitheft device 2, the external connection devices 3 and 4 are sequentially daisy chain connected, and these devices are Since it is configured to detect an abnormality in the connection status of adjacent devices, if any device is unintentionally removed, that is, if it is stolen, this can be detected promptly and an alarm sound is output. Alarm action can be performed. In addition, an anti-theft device 2 is provided separately from the audio device main body 1, and the anti-theft device 2 monitors the connection status of the external connection devices 3 and 4 while the audio device main body 1 is stopped. If detected, an alarm is output. As a result, even when the operation of the audio device main body 1 and the external connection devices 3 and 4 is both stopped, an alarm can be reliably output.

  Moreover, when installing the vehicle-mounted system 100 in a vehicle, since the audio equipment main body 1, the antitheft device 2, and the external connection devices 3 and 4 may be connected in series, installation work is easy. For example, when connecting a plurality of devices in a one-to-many manner with respect to one main device, it is necessary to route wiring etc. to a device located away from the main device, and the main device includes a plurality of devices extending to a plurality of devices. Wiring etc. must be connected, but in the in-vehicle system 100, the wiring corresponding to the communication lines 5, 6, 7, the start command signal line 10, and the power supply line 20 is simply arranged between adjacent devices. Since it is good, the burden of the operation | work concerning the operation of connection work, wiring, etc. is reduced significantly.

  In addition, by connecting the external connection devices similar to the external connection devices 3 and 4 sequentially in series from the end of the external connection device 4, the configuration of the in-vehicle system 100 can be easily changed, and a large number of external connection devices can be obtained. Can be used. Also in this case, the configuration of the audio device main body 1 and the antitheft device 2 is not complicated, and an in-vehicle system using a large number of devices can be constructed without causing an increase in cost.

  Further, in the in-vehicle system 100, when an abnormality in the connection state of the external connection devices 3, 4 is detected, an alarm is output by the anti-theft device 2, and an abnormality in the connection state of the anti-theft device 2 to the acoustic device main body 1. Since the alarm is output by the audio device main body 1, an alarm against theft can be output for all devices.

  In addition, in the said embodiment, although the vehicle-mounted system 100 containing two external connection apparatuses was demonstrated, this invention is not limited to this, It shall be set as the structure which connected more external connection apparatuses. Is also possible. Further, the speaker 8 included in the audio equipment main body 1 may be the same as the speaker 9 included in the antitheft device 2. Furthermore, although the audio equipment main body 1 and the antitheft device 2 are configured to output an alarm sound from the speakers 8 and 9, they may be configured to include a light source such as a light bulb and emit light together with the alarm sound, a wireless communication line, or the like. Information for notifying abnormality may be transmitted to a predetermined communication destination. Of course, other detailed configurations can be arbitrarily changed.

It is a figure which shows the structure of the vehicle-mounted system which concerns on embodiment to which this invention is applied. It is a figure which shows the structure of a vehicle-mounted system in detail. It is a flowchart which shows operation | movement of an audio equipment main body. It is a flowchart which shows operation | movement of an external connection apparatus. It is a flowchart which shows operation | movement of an antitheft device.

Explanation of symbols

1 Audio equipment body (on-vehicle equipment, control equipment)
2 Anti-theft device (on-vehicle device)
3, 4 Externally connected equipment (on-vehicle equipment, controlled equipment)
5, 6, 7 Communication line 8, 9 Speaker (alarm means)
10 Start command signal line (detection line)
11, 12 Microprocessor (detection means, alarm means)
13, 14 Microprocessor (detection means, output means)
15, 16, 17, 18 Voltage detector (detection means)
20 power line 21 switch 22, 23, 24 switch (voltage supply means)
31, 32, 33 Diode 100 In-vehicle system

Claims (5)

In an in-vehicle system configured with a plurality of in-vehicle devices,
The plurality of in-vehicle devices are sequentially connected in series,
Each of the in-vehicle devices is
Detection means for detecting an abnormality in the connection state of the adjacent in-vehicle device;
Output means for outputting a detection result by the detection means,
In-vehicle system characterized by A detection line is disposed between two adjacent on-vehicle devices,
The in-vehicle device includes a voltage supply unit that applies a predetermined voltage to the detection line,
The detecting means detects an abnormality in a connection state of the in-vehicle device connected via the detection line based on a voltage of the detection line;
The in-vehicle system according to claim 1. Among the plurality of in-vehicle devices sequentially connected in series, all the in-vehicle devices except for the in-vehicle device at one end include the voltage supply means.
The in-vehicle system according to claim 2. In an in-vehicle system configured by mounting a control device, a plurality of controlled devices that operate according to the control of the control device, and an anti-theft device on a vehicle,
The anti-theft device is connected to the control device, a plurality of the controlled devices are sequentially connected in series to the anti-theft device,
The anti-theft device and each of the controlled devices comprises a detecting means for detecting an abnormal connection state of the adjacent controlled devices;
The anti-theft device comprises alarm means for outputting an alarm based on a detection result by the detection means provided by itself and a detection means provided by the controlled device;
In-vehicle system characterized by The control device includes a detection unit that detects an abnormality in a connection state of the antitheft device, and an alarm unit that outputs an alarm based on a detection result by the detection unit,
The in-vehicle system according to claim 4.

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