JP2009280001A - Acoustic generator for theft alarm and antitheft control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic generator for theft alarm and an antitheft control system capable of suppressing the lowering of the sound pressure of alarm sound while preventing the breaking of a theft alarm siren from the outside of a vehicle. <P>SOLUTION: A high-strength and high-Young's-modulus cutoff part 16 resonated by the frequency of the alarm sound emitted from the theft alarm siren 10 is provided between the outside of the vehicle and theft alarm siren 10, so that the vibration of the alarm sound emitted from the theft alarm siren 10 and collided on the cutoff part 16 is transmitted to air in the outside of the vehicle by the resonance of the cutoff part 16 at the frequency of the alarm sound, and consequently the alarm sound is transmitted to the outside of the vehicle without being cut off by the cutoff part 16. This constitution can thus suppress the lowering of the volume of the alarm sound while preventing the breaking of the theft alarm siren 10 from the outside of the vehicle so as to effectively intimidate a thief trying to steal the vehicle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a burglar alarm sound generator and a burglarproof control system. In particular, the present invention relates to a technique for suppressing a decrease in sound pressure of an alarm sound emitted from a siren provided inside a vehicle to the outside.

  2. Description of the Related Art Antitheft devices mounted on vehicles are widely known for the purpose of preventing vehicle theft damage.

  The vehicle antitheft device includes one or more detection sensors for detecting an abnormality related to vehicle theft, antitheft means implemented based on a detection signal from the detection sensor, and a main unit that supervises the antitheft means. The one with is known. As the anti-theft means, a system including a theft alarm siren that emits an alarm sound for threatening the thief toward the outside of the vehicle based on an instruction from the main unit is widely applied. As such a configuration, for example, Patent Document 1 discloses a technique for generating an alarm sound by using an audio speaker as a notification unit.

  The above-described antitheft device is installed inside a vehicle that prevents theft, and in particular, the antitheft alarm siren is often installed inside the vehicle body on the side opposite to the fuel filler opening next to the trunk behind the vehicle. However, a thief who intends to steal a vehicle may access the theft alarm siren from outside the vehicle and attempt to invalidate or destroy the siren when stealing the vehicle. For this reason, the burglar alarm siren may be invalidated or destroyed by installing it as deep inside the vehicle as difficult to access from the outside as much as possible, or by providing a protective cover on the burglar alarm siren. Measures to prevent this can be considered. As such a configuration, for example, Patent Document 2 discloses a technique for covering the alarm bell portion with a cover so that the operation of the theft alarm bell is not obstructed from the outside.

JP-A-7-329722 JP-A-8-040328

  However, in the anti-theft alarm device of Patent Document 2, the alarm sound is blocked by the protective cover that covers the alarm bell, so that the sound pressure is lowered, so that the threat to the thief who tries to steal the vehicle is attenuated. There is a problem such as.

  Similarly, when the burglar alarm siren is installed deep inside a vehicle that is more difficult to access from the outside, the sound pressure is reduced because the alarm sound is blocked by a plurality of components inside the vehicle, etc. The problem is concerned.

  The present invention has been made in view of such a point, and protects a theft alarm siren from an attack by a thief from the outside of the vehicle and suppresses a reduction in sound pressure of an alarm sound emitted from the siren. An object of the present invention is to provide an anti-theft alarm sound generating device and an anti-theft control system having a blocking unit that can be used.

  In order to achieve the above object, a sound alarm device for a burglar alarm according to the present invention includes a sound generator installed in a vehicle as a component of a vehicle anti-theft device, the sound generator and the vehicle. Provided with an external side, and includes a blocking unit that blocks the sound generation device from the outside of the vehicle, the blocking unit being a frequency of an alarm sound emitted from the sound generation device toward the outside of the vehicle (Claim 1).

  In particular, in the acoustic alarm device for theft alarm according to the present invention, the shut-off unit is configured to make the natural frequency of the shut-off unit an integral multiple ± α of the frequency of an alarm sound emitted from the sound generator toward the outside of the vehicle. (Claim 2).

  In the burglar alarm sound generator according to the present invention, the blocking part may be an attachment member for fixing the sound generator inside the vehicle (claim 3).

  Further, in the burglar alarm sound generator according to the present invention, the blocking portion is a part of a component of the vehicle body of the vehicle (claim 4).

  And the antitheft control system of this invention is for vehicles provided with the acoustic generator for burglar alarms of any one of Claims 1-4, and the control part which controls the said acoustic generator for burglar alarms The anti-theft control system (claim 5).

  According to the theft alarm sound generator and the anti-theft control system of the present invention, between the outside of the vehicle and the anti-theft alarm siren is provided with a blocking part that resonates at the frequency of the alarm sound emitted from the siren, Since it is possible to prevent the sound pressure of the alarm sound from decreasing while preventing the theft alarm siren from being destroyed from the outside of the vehicle, it is possible to effectively threaten a thief who attempts to steal the vehicle.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of a vehicle anti-theft device incorporating the anti-theft alarm generator of the present invention.

  As shown in FIG. 1, the anti-theft device 1 includes a plurality of detection sensors, a main unit 2 that controls the entire system, and anti-theft means for threatening a thief who attempts to steal a vehicle.

  In the anti-theft device 1 of this embodiment, a door sensor 3, a bonnet sensor 4, a trunk sensor 5, and an intrusion detection sensor 6 are installed. Each of these detection sensors plays a role of detecting a vehicle abnormality when the alert mode is ON and sending a signal to the main unit 2.

  The door sensor 3 is a sensor that detects that a locked door is pry open, and may be any type that detects the rotation of the door rotation shaft or directly detects the movement of the door, such as a rotation sensor, a magnetic sensor, an optical sensor, etc. Applies. The bonnet sensor 4 and the trunk sensor 5 are sensors for detecting opening and closing of the bonnet and the trunk, and a rotation sensor, a magnetic sensor, an optical sensor, and the like are applied in the same manner as the door sensor 3. The intrusion detection sensor 6 detects a person who approaches the vehicle and tries to enter the vehicle. A barrier is formed in a certain space by the electromagnetic wave of the microwave. When a suspicious person enters the barrier, the output state of the microwave is changed. A type in which an intrusion is detected by changing, or a type in which an infrared radar detects a moving object in a vehicle is applied. In addition, as other detection sensors, a vibration sensor that detects the vibration of the vehicle body using an acceleration sensor, a tilt sensor that detects that the vehicle body is tilted using a biaxial acceleration sensor, and a window glass that uses ultrasonic waves. There is an ultrasonic sensor or the like that detects the breakage of the vehicle, and by combining these detection sensors, an abnormality relating to theft of the vehicle can be detected.

  The main unit 2 controls the entire system of the antitheft device 1. When the ignition switch of the vehicle is turned off and the main unit 2 receives the door lock signal from the keyless 20, the main unit 2 is turned on in the warning mode and starts each control of the antitheft device 1. In this case, a tuner (not shown) separate from the main unit 2 may receive a door lock signal from the keyless 20 and send a signal to the main unit 2. Moreover, although the security mode ON / OFF of the antitheft device 1 can be interlocked with the door lock by the mechanical key, the security mode of the antitheft device 1 is also canceled by releasing the door lock by picking or the like. Therefore, it is preferable that ON / OFF of the warning mode is interlocked with the keyless 20 door lock signal. The main unit 2 can be integrated with an ECU (Electronic Control Unit) of the vehicle, or can be provided separately from the ECU. The main unit 2 corresponds to a control unit that controls the burglar alarm sound generator of the present invention.

  Next, the operation of the antitheft device 1 will be described along the control flow of the main unit 2. FIG. 2 is an example of a flowchart showing processing of the main unit 2. First, the main unit 2 determines whether or not an engine stop request is made in step S1, that is, whether or not the ignition is turned off. If the determination result in step S1 is YES, that is, if the ignition is off, the process proceeds to step S2.

  The main unit 2 determines whether or not the door lock request signal from the keyless 20 has been received in step S2. If the determination result in step S2 is YES, that is, if the door lock request signal is received from the keyless 20, the main unit 2 proceeds to the next step S3. When the determination result of step S2 is NO, that is, when the door lock request signal from the keyless 20 is not received, the main unit 2 repeats the process of step S1 again.

  In step S3, the main unit 2 turns on the alert mode and starts control of each system of the antitheft device 1. Subsequently, the main unit 2 proceeds to step S4 after the process of step S3.

  In step S4, the main unit 2 determines whether or not the vehicle is stolen based on information from each detection sensor. When the determination result of step S4 is YES, that is, when the vehicle is stolen, the main unit 2 proceeds to the next step S8. If the determination result in step S4 is NO, that is, if the vehicle has not been stolen, the main unit 2 proceeds from step S5 to step S6.

  The main unit 2 determines whether or not the ignition of the vehicle is turned on in step S5, and subsequently determines whether or not the door lock is turned off in step S6. If the determination result in step S5 is YES, that is, if the ignition is turned on, or if the determination result in step S6 is YES, that is, if the door lock is turned off, the main unit 2 performs the next step S7. Then, the warning mode is turned off, the control of each system is terminated, and the process of step S1 is repeated again. Here, if the vehicle ignition is not turned on, that is, if the determination result in step S5 is NO, if the determination result in step S6 is NO, that is, if the door lock is ON, the main Unit 2 repeats the process of step S4 again without releasing the alert mode.

  When the determination result of step S4 is YES, the main unit 2 proceeds to the next step S8. In step S8, the main unit 2 instructs the head lamp 7, the hazard lamp 8, the horn 9, and the burglar alarm siren 10 to execute the anti-theft means, and ends the control process.

  Here, the anti-theft means of this embodiment turns on the vehicle headlamp 7 and the hazard lamp 8, rings the vehicle horn 9, and next to the trunk at the rear of the vehicle, on the inside of the vehicle body opposite to the fuel filler opening By sounding an alarm sound from the theft alarm siren 10 installed in the vehicle, a thief who attempts to steal the vehicle is intimidated.

  FIG. 3 is an explanatory view showing a schematic configuration of the inside of the anti-theft alarm siren 10 which is an anti-theft means of the present embodiment. The burglar alarm siren 10 includes an internal battery 11, a communication circuit 12, a microcomputer 13, a blowing circuit 14, and a speaker 15. The communication circuit 12 transmits an instruction from the main unit 2 that has detected an abnormality to the microcomputer 13. The microcomputer 13 performs communication control for instructing the sounding circuit 14 and the speaker 15 to generate and stop the alarm sound based on the instruction from the main unit 2. The microcomputer 13 also detects disconnection of a communication line that communicates between the main unit 2 and the burglar alarm siren 10. That is, when the communication line between the theft alarm siren 10 and the main unit 2 is disconnected, the microcomputer 13 detects the disconnection and uses the power of the internal battery 11 to generate an alarm sound in the blowing circuit 14. Instruct. Therefore, even when the thief cuts the communication line with the main unit 2, the thief alarm siren 10 can sound the alarm sound by itself to threaten the thief. The microcomputer 13 corresponds to a control unit that controls the burglar alarm sound generator according to the present invention.

  In addition, the frequency of the alarm sound generated from the blowing circuit 14 through the speaker 15 is preferably set between 2.0 kHz and 3.55 kHz, which is easily heard by human ears, in order to enhance the threat to the thief. More preferably, it may be set to around 2.5 kHz.

  FIG. 4 is an explanatory diagram showing a state in which the blocking unit 16 is attached to the burglar alarm siren 10. The blocking unit 16 is provided between the outside of the vehicle and the burglar alarm siren 10 in the vicinity of the burglar alarm siren 10 in order to protect the burglar alarm siren 10 from the outside. The above is the structure joined to the burglar alarm siren 10. The burglar alarm siren 10 and the blocking portion 16 are fixed to the inside of the vehicle by the mounting member 17.

  Thus, by installing a blocking part between the outside of the vehicle and the burglar alarm siren, the burglar alarm siren can be protected from the invalidation or destruction of the burglar alarm siren from the outside of the vehicle by the thief. Can do.

  Furthermore, the blocking unit 16 is configured to resonate with the frequency of the alarm sound from the theft alarm siren 10.

  When an abnormality relating to theft of the vehicle is detected and an alarm sound is emitted from the siren, the alarm sound vibrates in the air and is transmitted to the outside of the vehicle, but most of it collides with a shut-off unit installed near the siren. Then, the cutoff unit starts to resonate with the frequency of the alarm sound transmitted from the siren. And since the resonance | blocking part which resonated transmits the vibration to the air of the exterior side of a vehicle, as a result, the alarm sound which collided with the interruption | blocking part is transmitted to the vehicle exterior, without being interrupted by the interruption | blocking part. Therefore, it is possible to prevent the sound pressure of the alarm sound from decreasing by causing the shut-off portion of the theft alarm siren to resonate at the frequency of the alarm sound.

  The cutoff unit 16 can resonate at the frequency of the alarm sound of the theft alarm siren 10 by adjusting its natural frequency. The natural vibration is a specific vibration detected when an object is freely vibrated. The resonance means that an object having energy causes a natural vibration by an externally applied stimulus, and particularly a state in which the external stimulus is close to the natural frequency of the object. Therefore, by adjusting the natural frequency of the cutoff unit 16 to a value that is equal to or close to the frequency of the alarm sound emitted from the theft alarm siren 10, the cutoff unit 16 is caused to resonate by the frequency of the alarm sound. . As a result, the alarm sound that collided with the blocking portion can be transmitted to the outside of the vehicle without being blocked.

  Generally, the natural frequency of an object is expressed by the following equation.

f (Hz) = (1 / 2π) · (K / m) ^1/2 (1)

  Here, K is the spring constant of the object, and m is the effective mass. The spring constant K is expressed by the following equation.

K = P / δ = βEI / l 3 = βEbt 3 / 12l 3 ··· (2)

  Here, P is a load, δ is a maximum deflection, and β is a coefficient determined by an object support method and a load state. For example, cantilever β = 3, both-end support beam β = 48, both-end fixed beam β = 192 It is. E is the Young's modulus of the object, I is the moment of inertia of the cross section, and b, t, and l are the width, thickness, and length of the object, respectively.

  From the above equations (1) and (2), the natural frequency of the object is determined by the mass of the object, the support method, the Young's modulus, and the shape. From this, by adjusting the mass, support method, Young's modulus, and shape of the blocking portion 16, the natural frequency of the blocking portion 16 can be set to a value equal to the frequency of the warning sound. The interruption | blocking part 16 can be resonated.

  The blocking unit 16 is required to have high strength in order to protect the burglar alarm siren 10 from an attack from the outside of the vehicle. Furthermore, since a natural frequency that resonates at a frequency of 2.0 kHz to 3.55 kHz of an alarm sound emitted from the theft alarm siren 10 is required, a high Young's modulus is required. Therefore, the material applied to the blocking portion 16 may be a high strength / high Young's modulus material such as a metal, a composite material, an inorganic material such as crystal, carbon, and ceramics.

  The mass of the blocking unit 16 is determined such that the natural frequency of the blocking unit 16 is a value that resonates with the frequency of the alarm sound from the theft alarm siren 10, but depending on the frequency from 2.0 kHz to 3.55 kHz. Since a high natural frequency is necessary for resonance, the mass of the blocking portion 16 is preferably light.

  Further, the shape of the blocking portion 16 is a shape that can protect the burglar alarm siren 10 from the outside. For example, the blocking portion 16 can be joined to the lower portion of the burglar alarm siren 10 by an adhesive or screwing, and can adopt a plate shape that is bent in a dogleg shape in front of the burglar alarm siren 10 therefrom. . Moreover, the support method of the interruption | blocking part 16 is determined by how many places the interruption | blocking part 16 and the burglar alarm siren 10 are joined. In this case, when the blocking unit 16 is attacked from the outside of the vehicle, the blocking unit 16 is provided with a burglar alarm siren in order to prevent the bent portion of the blocking unit 16 from being damaged or the joint portion from being peeled off. 10 can be joined to a shape supported at two or more places, for example, a lower portion and an upper portion of the burglar alarm siren 10 by a U-shape or an arch shape.

  For example, the natural frequency of the blocking unit 16 can be adjusted by, for example, confirming the natural frequency of the blocking unit 16 using an FFT (Fast Fourier Transform) analyzer after the blocking unit 16 is joined to the burglar alarm siren 10. However, it is possible to proceed by a method of adjusting the Young's modulus, support method, mass and shape of the blocking portion 16.

  As described above, in the burglar alarm siren 10 of the first embodiment, the cutoff unit 16 that resonates with the frequency of the alarm sound emitted from the burglar alarm siren 10 between the outside of the vehicle and the burglar alarm siren 10. By being provided, it is possible to prevent the sound pressure of the warning sound emitted from the theft alarm siren 10 from being lowered while preventing the theft alarm siren 10 from being destroyed from the outside of the vehicle. Therefore, it is possible to effectively threaten a thief who tries to steal a vehicle.

  Next, a second embodiment of the present invention will be described. FIG. 5 is an explanatory diagram showing a state in which the blocking portion 18 is attached to the burglar alarm siren 10 of the embodiment. In addition, about the component similar to Example 1, the same reference number is attached | subjected in drawing and the detailed description is abbreviate | omitted.

  As in the first embodiment, the blocking portion 18 is provided between the outside of the vehicle and the burglar alarm siren 10 and in a position close to the burglar alarm siren 10, and at least one location is a burglar alarm siren. However, at least one place other than the joint portion with the burglar alarm siren 10 is joined to the inside of the vehicle.

  By adopting such a configuration, the attachment member of the burglar alarm siren that originally exists inside the vehicle also serves as a blocking portion, so that it is not necessary to add new parts. Therefore, it is possible to reduce the number of manufacturing steps and reduce the cost without increasing the number of parts while protecting the burglar alarm siren from an attack from the outside.

  Further, similarly to the first embodiment, the blocking unit 18 is configured to resonate with the frequency of the alarm sound from the theft alarm siren 10. Therefore, as the material of the blocking part 18, a material having a light weight, a high strength, and a high Young's modulus can be applied similarly to the blocking part 16 of the first embodiment.

  Here, the shape of the blocking portion 18 is a shape that can fix the theft alarm siren 10 to the inside of the vehicle while protecting the theft alarm siren 10 from the outside. For example, the blocking portion 18 is joined to the lower part of the burglar alarm siren 10 by an adhesive or screwing, bent from there to the front of the burglar alarm siren 10 and then bent in the reverse direction again. A plate shape or the like that is bent into a mold and joined to a vehicle can be employed. In addition, the blocking unit 18 is connected to the burglar alarm siren 10 or the vehicle in order to prevent the bent part of the blocking unit 18 from being damaged or the joint part from being peeled off when attacked from outside the vehicle. Each can be joined at two or more locations.

  Similarly to the first embodiment, the natural frequency of the blocking unit 18 is adjusted by, for example, joining the blocking unit 18 to the burglar alarm siren 10 and the vehicle and then using the FFT analyzer to detect the natural vibration of the blocking unit 18. While confirming the number, it is possible to proceed by adjusting the Young's modulus, support method, mass and shape of the blocking portion 18.

  As described above, the burglar alarm siren 10 of the second embodiment resonates between the outside of the vehicle and the burglar alarm siren 10 at the frequency of the alarm sound emitted from the burglar alarm siren 10, and the burglar alarm. By installing the blocking portion 18 that also serves as an attachment member for fixing the siren 10 for a vehicle inside the vehicle, it is possible to prevent the theft alarm siren 10 from being destroyed from the outside of the vehicle while suppressing an increase in the number of parts. And a reduction in the sound pressure of the alarm sound can be suppressed. Therefore, it is possible to effectively threaten a thief who attempts to steal a vehicle while achieving a reduction in manufacturing man-hours and a reduction in cost.

  The above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to these, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

  For example, a part of the vehicle body component inside the vehicle can be used as a blocking unit of the burglar alarm sound generator.

By setting it as such a structure, since the member which originally comprises a vehicle body also serves as the interruption | blocking part, the increase in the number of parts can be suppressed. Therefore, it is possible to effectively threaten a thief who attempts to steal a vehicle while achieving a reduction in manufacturing man-hours and a reduction in cost.

  In this case, in order to resonate the vehicle body component used as a shut-off part with the frequency of the alarm sound emitted from the siren, a high-strength, high Young's modulus material is joined to the vehicle body component, or the vehicle body component is ground or bent. The natural frequency can be adjusted by changing the mass and shape.

  Moreover, even if the natural frequency of the cutoff part is set to an integer multiple of the frequency of the alarm sound emitted from the siren, resonance of the cutoff part can be induced. Furthermore, even if there is an error between the natural frequency of the shut-off part and the frequency of the alarm sound, if the error ± α is 0 to 20%, resonance is induced, but to make it easier to induce resonance. In addition, the error ± α is preferably a small value. For example, ± α may be adjusted to 0 to 5%.

It is the figure which showed the external appearance of the antitheft device. The flow of the control which a main unit performs is shown. It is explanatory drawing which showed schematic structure inside the siren for burglar alarms. It is explanatory drawing which showed the state by which the interruption | blocking part was attached to the siren for burglar alarms. It is explanatory drawing which showed the state by which the interruption | blocking part was attached to the siren for burglar alarms.

Explanation of symbols

1 Anti-theft device 2 Main unit (control unit)
3 Door Sensor 4 Bonnet Sensor 5 Trunk Sensor 6 Intrusion Detection Sensor 10 Burglar Alarm Siren 11 Internal Battery 12 Communication Circuit 13 Microcomputer (Control Unit)
14 Sounding circuit 15 Speaker 16 Blocking part 17 Mounting member

Claims (5)

As a component of a vehicle antitheft device, a sound generator installed inside the vehicle,
Provided between the sound generator and the outside of the vehicle, and includes a blocking unit that blocks the sound generator from the outside of the vehicle,
The burglar alarm sound generating device, wherein the blocking unit is configured to resonate at a frequency of an alarm sound emitted from the sound generating device toward the outside of the vehicle. The sound generator for theft alarm according to claim 1,
The blocking unit adjusts the natural frequency of the blocking unit to an integer multiple ± α of the frequency of a warning sound emitted from the sound generation device toward the outside of the vehicle. Generator. The theft alarm sound generator according to any one of claims 1 and 2,
The burglar alarm sound generating device, wherein the blocking portion is an attachment member for fixing the sound generating device inside the vehicle. The theft alarm sound generator according to any one of claims 1 and 2,
The burglar alarm sound generating device, wherein the blocking part is a part of a component of the vehicle body of the vehicle. The sound generator for burglar alarm according to any one of claims 1 to 4,
The anti-theft control system for vehicles provided with the control part which controls the said acoustic generator for the theft alarm.

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