JP4375724B2 - Automotive security system - Google Patents

Description

  The present invention relates to an automobile security system.

JP2002-274276

  Recently, car theft and car roughening have occurred frequently. Therefore, the number of cars equipped with security systems is increasing.

  The security system for automobiles detects the vibration of the car during theft or roughing of the car with a vibration sensor built in the car, and if a vibration exceeding the set level is detected, it is judged as an abnormal situation. , It sounds a siren or blinks a hazard lamp to tell the outside that there is an abnormal situation.

  Conventionally, as a vibration sensor of an automobile security system, a dedicated vibration sensor such as an acceleration sensor or a level is used. However, these dedicated vibration sensors are expensive, and there are limitations on the mounting location and mounting method.

  Therefore, instead of using a dedicated vibration sensor, as disclosed in Patent Document 1, a focus coil and a tracking coil of a CD player are used as a vibration sensor.

  In other words, the focus coil and tracking coil of the CD player are for performing servo control of the focus and tracking of the optical pickup of the CD player. When the power of the CD player is off, the focus coil and the tracking coil vibrate with the vibration of the automobile. A voltage is generated because the coil is placed in a magnetic field. Therefore, the vibration of the automobile can be detected by the voltage from the focus coil and the tracking coil.

  However, in general, a CD player is often installed in the center of a car with little vibration. Therefore, in the method of using the focus coil and tracking coil of a CD player as a vibration sensor, in the case of theft or roughing on the car. There is a case where the vibration of the car cannot be detected well.

  The present invention has been made in view of the above points, and, like a focus coil and a tracking coil of a CD player, in an automobile security system that uses other components as vibration sensors, an automobile in the case of theft or roughing on the vehicle. It is an object of the present invention to provide an automotive security system that can detect the vibration of the vehicle with a vibration sensor and can reliably report theft or roughing of the vehicle.

The automobile security system of the present invention is a car audio speaker having a voice coil, and is installed at a plurality of locations in the automobile, and the voice coil vibrates with the vibration of the automobile during non-reproduction. A car audio speaker used as a vibration sensor by generating a back electromotive force from the coil, and detecting a back electromotive force generated from the voice coil of the speaker due to vibration of the automobile when the speaker is not reproduced, Detecting means for determining whether the back electromotive force is higher than a set level, notifying means for notifying that the vehicle is in an abnormal state, and when the detecting means determines that the back electromotive force is higher than a set level, and control means for operating the informing means, said detecting means is included in the microcomputer, each various units of the speaker It can absorb the difference in detection characteristics due to the difference of the different characteristics and installation conditions, and characterized in that it is started every predetermined time.

As a preferred embodiment, the detecting means and the control means are contained within a car audio equipment or a car navigation device. Further, the speaker, Ru is installed in the vicinity of the vehicle door or doors.

  According to the automobile security system of the present invention, a car audio speaker is used as a vibration sensor. However, the speaker is usually installed at or near the door of an automobile and is stolen or rough on the vehicle. It is easy to pick up the vibration of the car, and it is installed at a plurality of locations in the car to pick up the vibration of the whole car evenly, so the effect as a sensor is great. Therefore, the vibration of the automobile during theft or roughing on the vehicle can be detected well by the vibration sensor (car audio speaker), so that theft or roughing on the car can be reliably notified.

  Next, an embodiment of an automobile security system according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of an automobile security system according to the present invention. In the first embodiment, the circuit portion of the security system of the present invention is accommodated in a car audio device installed in a car. Therefore, in the main body 10, a car stereo unit 11 as a car audio device, a switch 12 as a circuit part of the security system of the present invention, an amplifying unit 13, a microcomputer 15 including a detecting unit 14, a horn and hazard control unit 16. And a remote control receiver 17 are provided.

  A hazard line is connected to the main body 10 via a hazard switch (not shown) near the driver's seat. A horn line is connected to the main body 10 via a horn switch (not shown) of the handle portion. Furthermore, the main body 10 is connected to a horn speaker 18 and a hazard lamp 19 that are also used as notification means when an abnormal situation such as theft or roughing of the vehicle occurs.

  Further, a car audio speaker 20 is connected to the main body 10. The car audio speakers 20 are installed at or near the door of the automobile, and there are a total of four on the front, rear, left and right sides of the car. The car audio speaker 20 is used as a vibration sensor of an automobile during non-reproduction.

  That is, the speaker 20 has a voice coil arranged in a magnetic field by a magnet, and when this voice coil vibrates due to the vibration of the automobile during non-reproduction, a back electromotive force is generated from the voice coil. Therefore, the vibration of the automobile can be detected by detecting the counter electromotive force from the speaker 20, and the speaker 20 can be used as a vibration sensor of the automobile at the time of theft and roughing on the vehicle.

  The switch 12 provided in the main body 10 switches whether the hazard lamp 19 and the horn speaker 18 are connected to the original hazard line and horn line, or connected to the output of the horn and hazard control unit 16. The switch 12 switches between connecting the output of the car stereo unit 11 to the car audio speaker 20 or connecting the output of the car audio speaker 20 to the amplifying unit 13. The amplifying unit 13 amplifies the back electromotive force generated in the speaker 20 supplied from the speaker 20 via the switch 12. The detection unit 14 of the microcomputer 15 determines whether the back electromotive force from the speaker 20 amplified by the amplification unit 13 is equal to or higher than a set level. The horn and hazard controller 16 detects that the microcomputer 15 detects that the hazard lamp 19 and the horn speaker 18 are connected to the output of the horn and hazard controller 16 via the switch 12 and the back electromotive force from the speaker 20 is equal to or higher than a set level. When the determination is made by the unit 14, based on the command from the microcomputer 15, the hazard lamp 19 is controlled to blink and the horn speaker 18 is sounded.

  The microcomputer 15 further controls the entire main body 10. By giving a command to the microcomputer 15 from the remote controller 21 via the remote control receiver 17, the main body 10 is selectively set in two modes: a normal mode and an antitheft mode.

  The normal mode is a normal car audio playback mode. The speaker 20 is connected to the output of the car stereo unit 11 by the switch 12, and car stereo music is played from the speaker 20. The hazard lamp 19 and the horn speaker 18 are also connected to the hazard line and the horn line by the switch 12 as originally connected, and play an original role.

  On the other hand, in the anti-theft mode, the hazard lamp 19 and the horn speaker 18 are connected to the output of the horn and hazard controller 16 by the switch 12. The car audio speaker 20 is connected to the amplifying unit 13 by the switch 12 and further connected to the detecting unit 14 of the microcomputer 15 via the amplifying unit 13. At this time, the car audio speaker 20 is in a non-reproducing state. Therefore, when the automobile vibrates due to theft or roughing of the car, the voice coil vibrates with the vibration to generate back electromotive force. The counter electromotive force is amplified by the amplification unit 13 and then supplied to the detection unit 14 of the microcomputer 15. If the detection unit 14 determines that the back electromotive force is greater than or equal to the set level, that is, if it is determined that the vibration of the vehicle is greater than or equal to the set value, the microcomputer 15 causes the vehicle to be stolen or rough on the vehicle. It is determined that this is an abnormal situation, and a command is given to the horn and hazard control unit 16, the hazard lamp 19 is blinked by the control unit 16, and the horn speaker 18 is sounded (the horn is sounded). To the outside.

  Switching from the normal mode to the anti-theft mode is performed by the remote controller 21 as described above, but when all the door locks are detected (can be detected by a door key interlocking switch) with the car engine key removed. Mode switching can also be performed.

  In addition, although switching from the anti-theft mode to the normal mode is also performed by the remote controller 21, the mode switching can be performed by detecting that the door lock is normally released. In the latter case, it is effective when the door can be locked and unlocked with the remote control. However, in the case of a type in which the door is locked and unlocked by inserting a key into the keyhole of the door, the security system of the present invention is vibrated at that time. May malfunction, so it is effective to use a remote control for mode switching.

  FIG. 2 is a flowchart showing the above operation in more detail. As a normal mode, for example, a state in which a car stereo is being reproduced is assumed (step S1). When the anti-theft mode is selected by a remote controller or the like, the mode is shifted to the anti-theft mode (step S2), and the vibration of the vehicle is detected by switching the speaker 20 to the security system side, that is, the detection unit 14 side of the microcomputer 15 (step S3). ). During vibration detection, when vibration greater than a set value, that is, back electromotive force from the speaker 20 greater than a set level is detected (step S4), for the horn switched to the security system side, that is, the output side of the horn and hazard control unit 16. The speaker 18 is sounded (the horn is sounded) and the hazard lamp 19 is blinked to inform the surroundings of the abnormal situation (step S5). During an abnormal situation notification, when the set time is reached and a time-out occurs or the anti-theft mode is canceled by a stop command from the remote controller or the like (step S6), the normal mode is restored. Also, when the normal mode is selected by the remote controller or the like during vibration detection by the speaker 20 (step S7), the normal mode is restored. In addition, since the anti-theft mode is performed in a parked state where the car engine is stopped, the vibration detection by the speaker 20 is performed by activating the circuit portion of the security system of the present invention at regular intervals in order to reduce power consumption. To do.

  FIG. 3 is a block diagram showing a second embodiment of the automobile security system of the present invention. In the second embodiment, the car stereo unit 11 is outside the main body 10, and the circuit portion of the security system of the present invention is configured separately from the car audio device. In this case, the main body 10 can be connected between the car stereo unit 11 (car audio equipment) and the speaker 20 to operate in exactly the same manner as in the first embodiment. It can also be applied to car audio devices.

  According to the security system of the present invention as described above, by using the car audio speaker 20 as a vibration sensor, it is possible to satisfactorily detect the vibration of the automobile during theft or roughing of the vehicle and And it is possible to reliably notify the rough on the vehicle. That is, the speaker 20 is usually installed at or near the door of an automobile to easily pick up vibrations of the automobile during theft or roughing of the automobile, and is installed at a plurality of locations to uniformly pick up vibrations of the entire automobile. Therefore, the effect as a sensor is great. Therefore, it is possible to detect well the vibration of the automobile at the time of theft or roughing on the vehicle, and to reliably report theft or roughing on the vehicle.

  Moreover, according to said security system, by detecting the back electromotive force with the microcomputer 15, it becomes possible to absorb the difference in the detection characteristic by the different characteristic for every unit of a speaker, and the difference in installation conditions. As a result, it is possible to cope with whatever kind of speaker is installed in the vehicle in advance, or even if the speaker is replaced with another one, and the versatility can be enhanced.

  Furthermore, if the circuit portion of the security system of the present invention is incorporated in a car audio device (or car navigation device) as in the first embodiment of FIG. 1, it is integrated with the car audio device or the car navigation device. Therefore, no additional space is required, and there is no need to be particularly conscious of the security system during installation. On the other hand, when the circuit portion of the security system of the present invention is configured separately from the car audio device as in the second embodiment of FIG. 3, it is easy to connect the circuit portion between the car audio device and the speaker. It can be made to correspond to the current car audio device.

The block diagram which shows 1st Embodiment of the security system for motor vehicles by this invention. The flowchart which shows operation | movement of this invention. The block diagram which shows 2nd Embodiment of the vehicle security system by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body 11 Car stereo part 12 Switcher 13 Amplification part 14 Detection part 15 Microcomputer 16 Horn and hazard control part 17 Remote control receiving part 18 Horn speaker 19 Hazard lamp 20 Car audio speaker 21 Remote control

Claims (3)

A speaker for a car audio having a voice coil, which is installed in a plurality of locations in the automobile, and the voice coil vibrates with the vibration of the automobile and a back electromotive force is generated from the voice coil during non-reproduction. A car audio speaker used as a vibration sensor by
Detecting means for detecting a back electromotive force generated from a voice coil of the speaker in response to vibration of the vehicle when the speaker is not reproduced, and determining whether the back electromotive force is equal to or higher than a set level;
Informing means for informing that the automobile is in an abnormal state;
Control means for operating the notification means when the detection means determines that the back electromotive force is equal to or higher than a set level ;
The detection means is included in a microcomputer, can absorb differences in detection characteristics due to different characteristics and installation conditions of each unit of the speaker, and is activated at regular intervals . Security system. The vehicle security system according to claim 1, wherein the detection unit and the control unit are included in a car audio device or a car navigation device. The vehicle security system according to claim 1 or 2 , wherein the speaker is installed at or near a door of the vehicle.

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