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JP2013216168

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2013216168
Abstract: The present invention provides a vehicle presence notification device capable of
arbitrarily controlling the directivity of a notification sound even if a dynamic speaker is attached
to an acoustic tube of an electromagnetic alarm. When the piezoelectric speaker 3 is mounted on
the spiral acoustic tube 2 of the electromagnetic alarm 1, the directivity of the notification sound
is controlled by the opening shape and the opening direction of the horn outlet α of the spiral
acoustic tube 2. Therefore, a communication hole β for connecting the inside and the outside is
provided in the acoustic pipe 2 at a portion different from the horn outlet α, and a notification
sound is emitted not only from the horn outlet α but also from the communication hole β. The
emitting direction and the emitting amount of the notification sound can be controlled by the
position (opening direction of the communicating hole β), the number and the size of the
communicating hole β. That is, by providing the communication hole β, the directivity (reaching
distance) of the notification sound can be arbitrarily controlled. [Selected figure] Figure 1
Vehicle presence notification device
[0001]
The present invention relates to a vehicle presence notification device that generates a
notification sound outside a vehicle to notify the presence of a vehicle, and is particularly suitable
for use in quiet vehicles such as electric vehicles, fuel cell vehicles, and hybrid vehicles. About.
[0002]
There has been proposed a vehicle presence notification device for notifying the presence of a
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vehicle by a notification sound (see, for example, Patent Document 1).
The vehicle presence notification device of Patent Document 1 generates a notification sound
using a dynamic speaker that directly generates an audible sound (sound wave of an audible
frequency).
[0003]
In the prior art, a dynamic speaker is mounted on a vehicle separately from an alarm (a horn)
generating an alarm sound. Therefore, it is necessary to secure a space for mounting the dynamic
speaker, and the vehicle mounting is bad. The On the other hand, unlike the alarm sound, a
notification sound notifying that the vehicle is approaching requires a sound (a pseudo engine
sound, a chord, a voice, a music, etc.) which does not make people feel unpleasant. In order to
suppress the annoyance, it is required to mix a bass (for example, an acoustic component of 600
Hz or less) into the notification sound. In order to reproduce bass as described above, it is
necessary to use a large dynamic speaker such as a woofer, which causes deterioration of the
vehicle mountability and causes an increase in cost.
[0004]
As means for solving the above problems, the present inventors attach a dynamic speaker to an
acoustic tube of an electromagnetic alarm mounted on a vehicle to generate an alarm sound, and
report sound is externally transmitted through the acoustic tube. It is proposed that the
technology to make release (not a well-known technology).
[0005]
However, the directivity of the notification sound (the reachability range of the notification
sound) is determined by the horn outlet (sound outlet provided at the end of the tube) of the
acoustic tube provided in the electromagnetic alarm.
For this reason, when the dynamic speaker is mounted on the acoustic pipe, there arises a
problem that the directivity of the notification sound can not be controlled. That is, since the
directivity of the notification sound is controlled by the horn outlet of the sound tube, (i) the
directivity (reaching range) of the notification sound can not be controlled, (ii) the directivity of
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the notification sound is enhanced There was a problem that the notification sound could not be
blown further away.
[0006]
JP 10-201001 A
[0007]
A first object of the present invention is to provide a vehicle presence notification device capable
of arbitrarily controlling the directivity (reaching range) of notification sound even if a dynamic
speaker is attached to an acoustic tube of an electromagnetic alarm.
A second object of the present invention is to provide a vehicle presence notification device
capable of transmitting the notification sound further by enhancing the directivity of the
notification sound even if the dynamic speaker is attached to the acoustic tube of the
electromagnetic alarm. is there.
[0008]
In order to achieve the first object, the vehicle presence notification device provides a
communicating hole for communicating the inside and the outside of the acoustic pipe in the
acoustic pipe at a portion different from the horn outlet. Thus, the notification sound can be
emitted not only from the horn outlet but also from the communication hole. Then, the emitting
direction and the emitting amount of the notification sound can be controlled by the “position
(opening direction of the communicating hole)”, the “number” and the “size” of the
communicating hole. That is, the directivity (reaching distance) of the notification sound can be
controlled by the "position", the "number" and the "size" of the communication holes.
[0009]
In order to achieve the above second object, the vehicle presence notification device mounts a
dynamic speaker on each of two electromagnetic alarm devices mounted on the vehicle, and the
same from the dynamic speakers of the two electromagnetic alarm devices Generate a
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notification sound of frequency. Then, the notification sound emitted from each electromagnetic
alarm (acoustic tube) interferes in the air, and the width and the width of the sound wave
combine in the air to increase the sound pressure of the notification sound. That is, the directivity
of the notification sound can be enhanced by the interference of the notification sound, and the
notification sound can be further blown away.
[0010]
(A) A front view of an electromagnetic alarm equipped with a piezoelectric speaker, (b) a
sectional view of an electromagnetic alarm equipped with a piezoelectric speaker, (c) a top view
of the main part of an acoustic pipe as viewed from below (Example 1). (A) An explanatory view
showing an arrival range of a notification sound using an acoustic pipe without a communication
hole, (b) an explanatory view showing an arrival range of a notification sound using an acoustic
pipe provided with a communication hole (Example 1) ). It is the schematic of a vehicle presence
notification apparatus (Example 1). (Example 2) which is a front view of two electromagnetic type
alarm devices mounted in a vehicle. It is a comparison figure with the reach | attainment range of
the notification sound which generate | occur | produced with only one electromagnetic alarm
and the reach | attainment range of the notification sound which generate | occur | produced
with two electromagnetic alarm (Example 2). Graph showing the relationship between the sound
pressure and the reach distance of notification sound generated only by the sound tube of one
electromagnetic alarm, and the relation between the reach distance and sound pressure of the
notification sound generated by the sound tubes of two electromagnetic alarms (Example 2). It is
the schematic of a vehicle presence notification apparatus (Example 3).
[0011]
The vehicle presence notification device of the first embodiment is provided with a dynamic
speaker 3 for generating a notification sound (a pseudo engine sound, a chord, a voice, a music,
etc.) in the acoustic tube 2 of the electromagnetic alarm 1. The communicating hole β for
emitting the sound in the acoustic tube 2 to the outside is provided in the acoustic tube 2 at a
portion different from the outlet α.
[0012]
In the vehicle presence notification device of the second embodiment, the dynamic speaker 3 is
mounted on each of the two electromagnetic alarm devices 1 mounted on the vehicle, and the
notification sound of the same frequency from the dynamic speaker 3 of each electromagnetic
alarm device 1 ( It generates pseudo engine sounds, chords, sounds, music, etc.).
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[0013]
A specific example (embodiment) to which the present invention is applied will be described
below with reference to the drawings.
The embodiment described below is a specific example, and it goes without saying that the
present invention is not limited to the embodiment.
In the following examples, the same reference numerals as those in the above-mentioned
"embodiment of the invention" indicate the same functional objects.
[0014]
Example 1 Example 1 will be described with reference to FIGS. 1 to 3. The vehicle presence
notification device notifies the pedestrian or the like around the vehicle of the presence of the
vehicle by a notification sound (for example, a pseudo engine sound, chords, voice, music, etc.),
and for example, the engine (internal combustion engine) is not mounted. Vehicles (electric
vehicles, fuel cell vehicles, etc.), vehicles that may stop the engine while driving and stopping
(hybrid vehicles, etc.), vehicles that may stop the engine while stopping (idle stop vehicles, etc.)
Or even an engine vehicle is mounted on a motor vehicle or the like having a quiet running noise.
[0015]
Here, the vehicle is equipped with the electromagnetic alarm device 1 that generates an alarm
sound. The electromagnetic alarm device 1 is a so-called vehicle horn that generates an alarm
sound when a horn switch (for example, a horn button of a steering wheel) is operated by a
passenger, and for example, a front grill (travelling It is fixedly arranged between the grille
provided at the wind intake and the heat exchanger (air conditioner heat exchanger, radiator,
etc.).
[0016]
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As shown in FIG. 1 (b), the electromagnetic alarm 1 generates an alarm sound generation unit 4
that generates an alarm sound by energization, and enhances the alarm sound generated by the
alarm sound generation unit 4 to the outside. And the coiled acoustic tube 2 (an example of the
acoustic tube 2) to discharge | release, It comprises.
[0017]
The alarm sound generation unit 4 is configured of: a coil 5 that generates a magnetic force
when energized; a fixed core 6 that generates a magnetic attraction force by the generated
magnetic force of the coil 5 (magnetic attraction core); and a center of the diaphragm 7
(diaphragm) And a movable iron core 8 (movable core) supported on the stationary iron core 6
so as to be movable toward the stationary iron core 6; and a current interrupter for continuously
interrupting the conduction circuit of the coil 5 when the coil 5 is energized. And 9 are
configured.
[0018]
The spiral acoustic pipe 2 is a spiral horn in which a trumpet member whose sound path is
expanded from the horn inlet (sound inlet) to the horn outlet α (the open end of the acoustic
pipe) is spirally provided.
And the alarm sound generation unit 4 is a side surface of the spiral acoustic pipe 2 (a plane
perpendicular to an axis passing through the spiral center: for example, the heat exchanger side
of the spiral acoustic pipe 2 when mounted on a vehicle , And is provided so as to generate an
audible alarm in the acoustic inlet at the center of the spiral acoustic tube 2.
[0019]
On the other hand, the vehicle presence notification device comprises: a piezoelectric speaker 3
(an example of a dynamic speaker) for generating a notification sound consisting of an audible
sound; and a control device 10 for controlling the operation of the piezoelectric speaker 3 .
[0020]
The piezoelectric speaker 3 is for generating an audible sound provided to generate a sound
wave in the audible band, and the primary resonance portion (primary resonance frequency) of
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the vibration system (piezo element + diaphragm) is in the audible band (for example, , Etc.).
Specifically, the piezoelectric speaker 3 uses a piezoelectric element (piezoelectric element) that
is expanded and contracted according to an applied voltage (charge and discharge), and a
diaphragm that is driven by the expansion and contraction of the piezoelectric element to
generate compression waves in air. Configured
[0021]
The control device 10 receives vehicle information from an ECU (abbreviation of engine control
unit) or the like, and generates a notification sound from the piezoelectric speaker 3 when a
driving condition for notifying the presence of the vehicle is satisfied. It is.
[0022]
As shown in FIG. 3, the control device 10: operation determination means 11 which determines
whether "the driving state of the vehicle conforms to the generation condition of the notification
sound"; A notification sound generation means 12 for generating a "frequency signal (audible
sound signal) forming a notification sound" when it is determined that the operation condition of
the "applicable to the generation condition of the notification sound"; And 12. A drive amplifier
13 for amplifying the "frequency signal forming a notification sound" output from 12 and driving
the piezoelectric speaker 3.
[0023]
The operation determination means 11 determines that the driving state of the vehicle conforms
to the condition for generating a notification sound, for example, when the vehicle travels at a
vehicle speed equal to or lower than a predetermined speed (for example, 20 km / h). (This is a
specific example for describing the embodiment, but not limited thereto).
[0024]
The notification sound generation means 12 is provided by a notification sound generation
program (sound software), and when an operation instruction is given from the operation
determination means 11, a digital signal "frequency signal forming an notification sound (electric
signal of audio frequency: so-called audio Signal) is created.
[0025]
The drive amplifier 13 is amplification means (for example, a power amplifier such as a class B
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amplifier or a class D amplifier) for driving the piezoelectric speaker 3 by the “frequency signal
forming the notification sound” generated by the notification sound generation unit 12. By
controlling the voltage applied to the speaker 3 (charging / discharging state of the piezo
element), the piezoelectric speaker 3 generates a “sound wave (sound of audible sound) forming
a notification sound”.
[0026]
Here, as shown in FIG. 1 (b), the piezoelectric speaker 3 is attached to the spiral acoustic tube 2
so as to face the alarm sound generation unit 4, and spirals the notification sound emitted by the
piezoelectric speaker 3. It is provided to emit in the center of the acoustic tube 2.
By providing in this manner, the notification sound emitted by the piezoelectric speaker 3 is
emitted to the outside of the vehicle via the spiral acoustic tube 2.
Thereby, the bass generated by the piezoelectric speaker 3 can be amplified by the spiral
acoustic tube 2 and emitted to the outside of the spiral acoustic tube 2.
[0027]
On the other hand, the horn outlet α of the spiral acoustic tube 2 is opened toward the front of
the vehicle and provided so as to fly an alarm sound forward of the vehicle.
For this reason, the directivity (the reachable range of the notification sound) of the notification
sound generated by the piezoelectric speaker 3 is also determined by the horn outlet α of the
spiral acoustic tube 2.
As described above, a solid line A in FIG. 2A shows a specific example of the directivity (the
reachable range of the notification sound) when the notification sound is generated only from the
horn outlet α.
[0028]
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As described above, when the piezoelectric speaker 3 is mounted on the spiral acoustic tube 2,
there arises a problem that the directivity of the notification sound can not be controlled.
Specifically, since the directivity of the notification sound is governed by the opening shape and
the opening direction of the horn outlet α of the spiral acoustic tube 2, it becomes impossible to
arbitrarily control the directivity (reaching range) of the notification sound. .
[0029]
Therefore, in this embodiment, as means for solving the above-mentioned problems, a technology
is provided in which a communication hole β for communicating inside and outside is made in
the middle of the horn of the spiral acoustic pipe 2 different from the horn outlet α. doing.
Thus, the notification sound can be emitted not only from the horn outlet α but also from the
communication hole β. That is, directivity can be arbitrarily controlled by the sound wave
emitted from the communication hole β. Specifically, the emitting direction and the emitting
amount of the notification sound can be controlled by the “position (opening direction of the
communicating hole β)”, the “number” and the “size” of the communicating hole β.
[0030]
As a specific example, in this embodiment, as shown in FIGS. 1 (b) and 1 (c), one communicating
hole β is formed on the lower surface of the horn in the vicinity of the horn outlet α of the
spiral acoustic tube 2. It is provided. As a result, the notification sound that has passed through
the communication hole β can be reflected by the road surface below and diffused to the
surroundings of the vehicle. As a result, as shown by the solid line B in FIG. 2B, the notification
sound can be made to reach a wide range around the vehicle.
[0031]
(Effect 1 of Embodiment 1) Although the vehicle presence notification device of this embodiment
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1 emits the notification sound generated by the piezoelectric speaker 3 through the spiral
acoustic pipe 2, as described above, the horn The directivity (reaching distance) of the
notification sound is arbitrarily controlled by the communication hole β provided at a site
different from the outlet α. The communication hole β can easily change the “position”, the
“number” and the “size” to be opened by cutting or the like. Therefore, the directivity of the
notification sound can be easily controlled by the communication hole β.
[0032]
(Effect 2 of Embodiment 1) As described above, the vehicle presence notification device of this
embodiment adopts the piezoelectric speaker 3 as a means for generating a notification sound,
but the spiral sound of the electromagnetic alarm 1 is used. By using the tube 2, the sound
pressure of the bass can be increased as in the case of using a large dynamic speaker (woofer or
the like). Therefore, the cost of the vehicle presence notification device capable of generating a
notification sound including bass can be suppressed.
[0033]
(Effect 3 of Example 1) In this example, the piezoelectric speaker 3 for generating audible sound
was used as an example of a small-sized dynamic speaker. Since the cost of the piezoelectric
speaker 3 is low, the cost of the vehicle presence notification device can be reduced as a result.
Moreover, since the piezoelectric speaker 3 can be provided smaller and lighter than the cone
speaker, it is excellent in the mountability to the electromagnetic alarm 1.
[0034]
(Effect 4 of Embodiment 1) The piezoelectric speaker 3 of this embodiment is disposed at the
opposite position of the alarm sound generating unit 4. Concretely, the piezoelectric speaker 3 is
the other side surface of the spiral acoustic tube 2 (surface perpendicular to the axis passing
through the spiral center: for example, the surface on the front grille side of the spiral acoustic
tube 2 when mounted on a vehicle ) And is provided to emit a notification sound into the acoustic
inlet at the center of the spiral acoustic tube 2. As described above, by mounting the piezoelectric
speaker 3 at the position opposite to the alarm sound generation unit 4, the mountability of the
piezoelectric speaker 3 to the spiral acoustic tube 2 can be enhanced. Furthermore, there is no
problem that the piezoelectric speaker 3 mounted on the spiral acoustic tube 2 prevents the
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operation of the alarm sound generating unit 4 (the operation of generating the alarm sound).
[0035]
Second Embodiment A second embodiment will be described with reference to FIGS. 4 to 6. In the
following embodiments, the same reference numerals as in the first embodiment indicate the
same functions. In the above-described first embodiment, as an example of controlling the
directivity of the notification sound, an example is shown in which the arrival distance of the
notification sound to the front is reduced and, instead, the arrival range of the notification sound
to the vehicle surroundings is extended. On the other hand, in the second embodiment, the
directivity of the notification sound is further enhanced, and the arrival distance of the
notification sound in front of the vehicle is lengthened.
[0036]
Usually, two electromagnetic alarms 1 are mounted on the vehicle. Alarm sounds of different
frequencies are generated from the two electromagnetic alarm devices 1 and are provided so as
not to be disturbed even if the alarm sound is loud. Therefore, as shown in FIG. 4, in the vehicle
presence notifying apparatus of this embodiment, the piezoelectric speaker 3 is mounted on each
of the two electromagnetic alarm devices 1 mounted on the vehicle. The spiral acoustic tube 2 of
the second embodiment does not have the communication hole β disclosed in the first
embodiment. Then, a specific example of directivity (reaching range of notification sound) in the
case where the notification sound is generated only from the piezoelectric speaker 3 of one or
the other electromagnetic alarm device 1 will be described with reference to FIG. Shown in.
[0037]
On the other hand, the control device 10 gives the same drive signal to the respective
piezoelectric speakers 3 of the two electromagnetic alarms 1 when the driving condition for
informing the presence of the vehicle is satisfied, and the same frequency is obtained from each
of the piezoelectric speakers 3. Generate a notification sound. Thereby, the notification sound
emitted from the spiral acoustic tube 2 of the electromagnetic alarm 1 interferes in the air
(mainly in front of the vehicle toward the horn outlet α), and the width and width of the sound
wave in the air are air By combining in, the sound pressure of the notification sound increases. As
a result, as indicated by the solid line E in FIG. 5, the directivity of the notification sound can be
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enhanced in the interference direction (front of the vehicle) of the notification sound, and the
notification sound can be blown further forward toward the front of the vehicle.
[0038]
This specific example will be described with reference to FIG. The relationship between the
distance and the sound pressure in the case where each of the piezoelectric speakers 3 of the two
electromagnetic alarm devices 1 individually generates a notification sound (in the case of single
operation) is shown by solid lines X and Y in FIG. On the other hand, the relationship between the
distance and the sound pressure when the notification sound of the same frequency is generated
from the respective piezoelectric speakers 3 of the two electromagnetic alarm devices 1 (when
double operation is performed) is shown by the solid line Z in FIG. Show. From the experimental
results shown in FIG. 6 as well, it can be read that the directivity of the notification sound can be
enhanced to increase the reach distance of the notification sound to the front of the vehicle.
[0039]
Third Embodiment A third embodiment will be described with reference to FIG. The third
embodiment is a technique applicable to any of the first and second embodiments. The control
device 10 of this embodiment controls not only the piezoelectric speaker 3 but also the
energization of the alarm sound generator 4. (i) When the horn switch is operated, the alarm
sound generator 4 (i.e., the alarm sound generator 4) The alarm sound of loud sound pressure is
generated from the electromagnetic alarm device 1). (Ii) When generating the notification sound,
the notification sound is generated from the alarm sound generation unit 4 together with the
piezoelectric speaker 3.
[0040]
Specifically, when the voltage applied to the alarm sound generation unit 4 is “self-excitation
voltage (for example, 8 V or more)” higher than the threshold value, the current interrupter 9
interrupts the energization of the coil 5 and a large sound pressure alarm Generate a sound.
Then, when the horn switch is operated by the occupant, the control device 10 applies a selfexcitation voltage (specifically, a battery voltage of 12 V) to the alarm sound generation unit 4 to
generate a loud noise from the electromagnetic alarm 1. Generate a pressure alarm sound.
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[0041]
On the other hand, when the voltage applied to the alarm sound generation unit 4 is “other
excitation voltage (for example, less than 8 V)” lower than the threshold value, the current
interrupter 9 does not perform the intermittent operation of the coil 5. Then, when the coil 5 is
driven by the audio signal by the separately excited voltage, the diaphragm 7 vibrates according
to the audio signal to generate a sound wave according to the audio signal. That is, the alarm
sound generation unit 4 functions as a dynamic speaker to perform the speaker operation.
Therefore, when generating a notification sound, the control device 10 outputs the “frequency
signal forming the notification sound” output from the notification sound generation means 12
to a drive amplifier (switching amplifier etc.) 14 different from the drive amplifier 13 described
above. At the same time, the alarm sound generation unit 4 generates a notification sound at the
same time as the piezoelectric speaker 3.
[0042]
As described above, by simultaneously generating the notification sound from both the
piezoelectric speaker 3 and the alarm sound generation unit 4, the sound pressure of the
notification sound can be increased more than in the case of the piezoelectric speaker 3 alone.
[0043]
In the above embodiment, an example in which one piezoelectric speaker 3 is attached to the
acoustic pipe 2 (in the example, the spiral acoustic pipe 2) is shown, but a plurality of
piezoelectric speakers 3 are mounted on the acoustic pipe 2 to generate a notification sound
Sound pressure may be increased.
[0044]
In the above embodiment, an example of using the piezoelectric speaker 3 as an example of the
dynamic speaker is shown, but the present invention is not limited to the piezoelectric speaker 3
and another small speaker (for example, small cone speaker) directly emitting an audible sound
Etc.).
[0045]
In the above embodiment, an example in which the notification sound is generated by the
dynamic speaker (the piezoelectric speaker 3 in the embodiment) is shown, but the parametric
speaker is mounted and the dynamic speaker is the acoustic tube 2 (the spiral acoustic tube 2 in
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the embodiment) It may be provided to emit both the notification sound generated through the
above and the notification sound generated by the parametric speaker outside the vehicle.
[0046]
The dynamic speaker may be simultaneously activated when the alarm sound generation unit 4
is activated, and the timbre of the alarm sound (generation frequency of the alarm sound) may be
controlled by the operation of the dynamic speaker.
[0047]
1 electromagnetic alarm 2 spiral sound tube 3 piezoelectric speaker (dynamic speaker) α horn
outlet β communicating hole
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