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DESCRIPTION JP2015063156

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DESCRIPTION JP2015063156
To provide a noise suppressing device for a vehicle capable of preventing a surrounding area
from being disturbed when the volume inside a vehicle compartment is large with a simple
configuration. A volume information acquisition unit for acquiring volume information including
a volume in a vehicle compartment of a vehicle, a vehicle condition acquisition unit for acquiring
a condition of the vehicle, and a vehicle interior in volume in the vehicle interior based on the
condition of the vehicle Based on the leaked volume estimation unit that estimates the leaked
volume from the vehicle to the outside of the vehicle, the ambient state acquisition unit that
acquires the ambient state of the vehicle, and the volume of ambient sound generated around the
vehicle based on the ambient state of the vehicle To the external device, and a recommended
value calculation unit that calculates a recommended value of the volume in the vehicle
compartment based on the leaked volume and the volume of the ambient sound, and the
recommended volume information including the recommended value to the external device And
an output unit for outputting. [Selected figure] Figure 1
Noise control device for vehicle
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
noise suppression device for a vehicle that suppresses noise to the surroundings due to noise in a
vehicle compartment.
[0002]
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1
There is a driver that travels while reproducing an acoustic signal from an audio device or the
like of a vehicle at a large volume that blocks a sound outside the vehicle.
Under such a condition, opening the window may cause noise damage to the surroundings of the
vehicle. Therefore, when the window is opened, it is necessary to control the sound volume to
such an extent as not to cause noise damage.
[0003]
Therefore, when the window is opened, noise is prevented by using the vehicle interior S / N
ratio input means in order to prevent external noise such as a siren sound of an emergency
vehicle and a crossing alarm sound from entering the vehicle interior when the window is
opened. A car interior environment control system has been devised which can freely adjust the
relative levels of musical tones while reducing the burden on hearing while raising the relative
levels of musical tones in view of reducing the level (see Patent Document 1).
[0004]
In addition, when the volume in the vehicle compartment is above the specified volume, if there
is an open window among the windows of the vehicle, by closing the open window, it is possible
to prevent inconvenience to the surroundings. A noise prevention device has been devised (see
Patent Document 2).
[0005]
Patent No. 4711082 gazette JP, 2007-056533, A
[0006]
Patent Document 1 aims to enable a passenger inside the vehicle to enjoy musical tones without
being affected by noise outside the vehicle, and does not consider the influence of the sound of
the music leaking out of the vehicle.
[0007]
Patent Document 2 closes the window of the vehicle when the volume in the vehicle
compartment is equal to or higher than the specified volume, but when it is necessary to keep the
window open for ventilation etc., the user's convenience and comfort There is a possibility of
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2
damage.
The sudden closing of the window may also surprise the occupants (especially children).
Furthermore, when the window is closed, the sound leaking to the outside of the vehicle is
reduced, and the volume in the vehicle compartment is increased accordingly, which may make
the occupants feel uncomfortable.
It can not be applied to vehicles whose structure does not allow automatic opening and closing of
windows.
[0008]
With the background of the above problems, it is an object of the present invention to provide a
vehicle noise suppression device capable of preventing inconvenience around the surroundings
when the volume in the vehicle compartment is large with a simpler configuration.
[0009]
The vehicle noise suppression device for solving the above problems includes a volume
information acquisition unit that acquires volume information including a volume of a vehicle
interior of the vehicle, a vehicle state acquisition unit that acquires a vehicle state, and a vehicle
state. A leak volume estimation unit that estimates the volume of leaks from the vehicle
compartment to the outside of the vehicle, the ambient condition acquisition unit that obtains the
ambient condition of the vehicle, and the ambient condition of the vehicle; It includes a
recommended value calculation unit that calculates a recommended value of the volume in the
vehicle compartment based on the ambient volume estimation unit that estimates the volume of
the ambient sound that occurs around the vehicle, the leaked volume and the volume of the
ambient sound, And an output unit that outputs volume recommended value information to an
external device.
[0010]
The present invention suppresses the noise to the surroundings due to the sound in the
passenger compartment without closing the window as in Patent Document 2.
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With the above configuration, noise to the outside of the vehicle can be suppressed even when
the window is opened, and the convenience and comfort of the user to keep the window open
can be secured.
In addition, since the window does not close suddenly, the occupants (especially, children) are
not surprised.
In addition, the present invention can be applied to vehicles having a structure in which the
windows can not be automatically opened and closed.
[0011]
Further, in the present invention, it is possible to cause inconvenience around the vehicle by
adding the open / close state of the window and the state of the vehicle, instead of judging
whether the noise is generated only by the volume in the vehicle compartment. Perform volume
control only when. Therefore, the frequency at which the volume is suppressed is reduced, and
the frequency at which the occupant listening to the music in the vehicle cabin is offensive due to
the reduction in the volume is also reduced.
[0012]
The figure which shows the structural example of the noise control apparatus for vehicles of this
invention. FIG. 7 is a flow chart for explaining noise suppression processing.
[0013]
Hereinafter, the configuration of the present invention will be described using the drawings. FIG.
1 shows the configuration of the vehicle noise suppression device 1 and related devices of the
present invention. The vehicle noise suppression device 1 includes a control unit 2 (a leak
volume estimation unit, an ambient volume estimation unit, and a recommended value
calculation unit according to the present invention) including a known CPU, a ROM, a RAM (all
not shown) and the like. A memo 3 for storing necessary data, a wireless communication unit 4
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(wireless communication unit 4 according to the present invention, a communication unit) for
wireless communication with an external device, and communication with other vehicle devices
via an in-vehicle LAN 90 LAN I / F 5 (a sound volume information acquisition unit according to
the present invention, a vehicle state acquisition unit, an ambient state acquisition unit, and an
output unit), which is an interface circuit for performing the above.
[0014]
A control program is stored in the ROM (or the memory 3) of the control unit 2 and the CPU
executes the control program to realize various functions of the vehicle noise suppression device
1.
[0015]
The wireless communication unit 4 is, for example, a tablet type terminal represented by a
known smart phone carried by a user (a generic name of a portable information terminal
operated by a finger with a touch panel mounted on a display portion such as a liquid crystal
display), These can be communicated with an external facility such as a mobile communication
terminal 70) and the server 80 or the like.
[0016]
The vehicle noise suppression device 1 transmits data between the audio device 10, the power
window ECU 20, the navigation device 30, the vehicle state detection sensor group 40, the
human detection sensor group 50, and the weather information detection sensor group 60 via
the in-vehicle LAN 90. Communicate.
[0017]
The vehicle noise control device 1 may be included in the audio device 10 or the navigation
device 30, that is, the device that outputs an acoustic signal.
[0018]
The audio device 10 is a device that reproduces media for various music and receives a radio
signal and outputs it as sound.
The navigation device 30 described later may be provided with such an audio function.
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The audio device 10 includes an operation unit 11 that allows the occupant to perform
operations such as playing music, and a volume adjustment unit 12 that adjusts the volume.
The audio device 10 can also adjust the volume based on the control command (volume
recommended value information of the present invention) from the vehicle noise suppression
device 1.
[0019]
The power window ECU 20 controls the opening and closing of a window (corresponding to each
seat, not shown) of the vehicle.
The power window ECU 20 is connected to an open / close switch (not shown) corresponding to
each window of the vehicle and a drive motor (power window mechanism, not shown) for
opening / closing each window. The corresponding drive motor is driven to open and close the
window. Further, it includes an open / close state detection unit 21 that detects the open / close
state of the window. The power window mechanism may not be provided, and only the open /
close state detection unit 21 may be configured.
[0020]
The navigation device 30 is a device that detects the current position of the vehicle and displays
a map around the current position and a mark indicating the current position on the map on the
screen. The navigation device 30 includes at least a position detection unit 31 that detects the
current position of the vehicle, and a map data input unit 32 that inputs map data to be displayed
on the screen.
[0021]
The position detection unit 31 includes a well-known geomagnetic sensor, a gyroscope, a
distance sensor, and a GPS receiver for a GPS (Global Positioning System) that detects the
position of the vehicle based on radio waves from satellites. Use while complementing.
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[0022]
The map data input unit 32 is for displaying background data for displaying a background
regarding terrain and facilities, a place name, and the like when displaying a road map data
indicating a road connection structure and a road map using the road map data. The various map
data such as character data is input to a control circuit (not shown) that controls various
processes of the navigation device 30.
[0023]
Road map data includes node data on a point at which a plurality of roads intersect, merge, and
branch, and link data on a road connecting between the points.
The node data includes a node ID for identifying the node, node coordinates, a node name, a
connection link ID in which link IDs of all links connected to the node are described, and an
intersection type.
The link data includes a link ID identifying a road, a link length, start point and end point
coordinates, a road type such as an expressway or a general road, a road width, a link travel time,
a slope, and the like.
[0024]
The vehicle state detection sensor group 40 includes, for example, a vehicle speed sensor 41 and
a vibration sensor 42. The vehicle speed sensor 41 is a wheel speed sensor that generates wheel
speed pulses using a well-known Hall element or the like, and calculates the vehicle speed based
on the number of pulses per unit time. The vibration sensor 42 detects the vibration level of the
vehicle, and the details are described in Japanese Patent Application Laid-Open No. 2013170980. Alternatively, the wheel speed sensor may be used to detect the vibration. Details are
described in JP-A-2005-112017. Also, the vibration level of the vehicle may be detected based on
the detection state of the air pressure sensor (ie, change in air pressure) that detects the air
pressure of the tire of the vehicle.
[0025]
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The state of the road surface can be estimated from the detection state of the vibration sensor
42. That is, when vibration in a predetermined range continues beyond a predetermined time, it
can be estimated that the vehicle is traveling on an unpaved road, a gravel road, or a continuous
road with unevenness (so-called bad road).
[0026]
The human detection sensor group 50 includes a radar 51 for detecting an object around the
vehicle, a camera 52 for photographing the periphery of the vehicle, and an infrared sensor 53
for detecting an object around the vehicle. The human detection sensor group 50 is provided, for
example, in a known vehicle antitheft device for preventing the theft of the vehicle. In this case,
human detection information is acquired from the vehicle antitheft device via the in-vehicle LAN
90. Further, for example, the human detection information may be acquired from a seating
sensor which is included in a known airbag device and detects whether or not the occupant is
seated on the seat.
[0027]
The weather information detection sensor group 60 includes a solar radiation sensor 61, a
temperature sensor 62, and an illuminance sensor 63. The solar radiation sensor 61 and the
temperature sensor 62 are provided in a known vehicle air conditioner for air conditioning the
vehicle interior. Further, the illuminance sensor 63 is included in a known auto light system that
performs lighting control of the lighting device according to the brightness around the vehicle. In
this case, weather information is acquired from the vehicle air conditioner or the auto light
system via the in-vehicle LAN 90.
[0028]
A noise suppression process, which is included in the above-mentioned control program and
repeatedly executed at a predetermined timing, will be described with reference to FIG. First, the
vehicle state is acquired via the in-vehicle LAN 90 (S11). The vehicle state includes the following,
but in this case, at least an open / closed state of a window of the vehicle is acquired. Open and
closed state of the window of the vehicle (obtained from the power window ECU 20). Vehicle
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speed (acquired value detected by the vehicle speed sensor 41). Vibration state of the vehicle
(acquired value detected by the vibration sensor 42).
[0029]
Next, based on the open / close state of the window of the vehicle, it is determined whether there
is an open state window. When there is no window in the open state (S12: No), this processing
ends. On the other hand, when there is a window in an open state (S12: Yes), volume information
including the volume set by the volume adjustment unit 12 is acquired from the audio device 10
(S13).
[0030]
Depending on the volume, the sound may leak outside the vehicle even if the window is fully
closed, so step S12 and subsequent steps may be executed regardless of the open / closed state
of the window without executing step S12.
[0031]
Next, based on the degree of opening of the window and the volume, a leakage volume leaking
out of the vehicle is estimated (S14).
The leak volume is stored in the memory 3 as map data, which is measured in advance for each
combination with the vehicle type and the audio device, for example. As a setting method of map
data, any of the following may be used. For example, as in the driver's seat side window or the
sidewalk side (left side of the vehicle when traveling on the left side), the leakage volume when
changing the opening degree of the predetermined window is used as map data. • The leak
volume when changing the open state of all the windows in the same way is used as map data. •
The leak volume when changing the opening degree of the open state is made map data for each
window. When multiple windows are open, the sum of the leak volume of each is taken as the
leak volume of the vehicle. The open state of the window used for measurement is, for example,
full open, 3/4 open, half open, and 1⁄4 open, and at other opening degrees, the leakage volume is
determined by map interpolation. Also, the measurement position is on the sidewalk of the
vehicle.
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[0032]
The above-described configuration is that “the vehicle state acquisition unit acquires the open /
close state of the window of the vehicle, and the leak volume estimation unit estimates the leak
volume based on the open / close state”. According to this configuration, the leak volume can be
estimated with a simple configuration.
[0033]
Next, the vehicle speed is reflected on the leak volume (S15). For example, a correction value
(either positive or negative) corresponding to the vehicle speed is added to the leak volume.
Alternatively, the leak volume is multiplied by a correction coefficient (a number of zero or more)
according to the vehicle speed. The correction value or the correction coefficient is stored in
advance in the memory 3. The same applies to the case where various states are reflected in the
subsequent steps. The present configuration is such that “the vehicle state acquisition unit
acquires the speed of the vehicle, and the leakage volume estimation unit reflects the speed of
the vehicle on the leakage volume”. This configuration makes it possible to estimate the leak
volume more accurately.
[0034]
The above-described correction value and correction coefficient are maximum at, for example,
zero vehicle speed, and decrease as the vehicle speed increases. For pedestrians, when the
vehicle is at a standstill, the correction value and the coefficient are increased because the time
affected by the leak volume (i.e. noise) is long. On the other hand, when the vehicle is running,
the time affected by the leak volume is short, and the leak volume is reduced by the running
noise and wind noise, so the correction value and the coefficient are reduced.
[0035]
Next, the vibration state of the vehicle is reflected on the leak volume (S16). The present
configuration is such that “the vehicle state acquisition unit acquires the vibration of the
vehicle, and the leakage volume estimation unit reflects the vibration of the vehicle to the leakage
volume”. This configuration makes it possible to estimate the leak volume more accurately.
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[0036]
The above-mentioned correction value and correction coefficient are maximum at, for example,
zero vibration and decrease as the vibration increases. As described above, when the vibration is
close to zero, it can be estimated that the vehicle is traveling on the pavement, so the amount of
decrease in the volume of leakage due to the traveling sound is small, and the correction value
and the coefficient are set large. On the other hand, when the vibration is large, it can be
estimated that the vehicle is traveling on a rough road such as a gravel road, so the amount of
reduction of the leakage volume due to the traveling sound is large, and the correction value and
the correction coefficient are set small.
[0037]
Next, the surrounding state of the vehicle is acquired (S17). The ambient state includes at least
one of the current position of the vehicle, human detection information, weather information
around the vehicle, and date and time information. The details are as follows. The current
position of the vehicle is acquired from the navigation device 30. In addition, road map data
around the current position is also acquired.
[0038]
The human detection information uses at least one of the following. A detection state of a person
by the human detection sensor group 50 (at least one of the radar 51, the camera 52, and the
infrared sensor 53). This detection state indicates the number or density of people around the
vehicle. The reception state of the radio wave of the mobile communication terminal 70 in the
wireless communication unit 4. For example, the wireless LAN communication of the tablet type
terminal uses the 2.4 GHz band or 5 GHz band. Also, in the mobile phone, the communication
frequency band is determined according to the communication method (3G or the like).
Therefore, the number or density of the mobile communication terminals 70 (that is, people)
around the vehicle can be estimated from the use condition of each channel or the intensity of
the received radio waves. According to the present configuration, “the ambient state acquisition
unit includes a communication unit that communicates with a mobile communication terminal
carried by a person around the vehicle, and based on the communication result between the
communication unit and the mobile communication terminal, It is what "acquires the existence of
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a person." The household penetration rate of mobile phones in recent years is said to have
exceeded 90%. The mobile phone always communicates with the base station. According to this
configuration, the presence of people around the vehicle can be acquired with a simple
configuration.
[0039]
The weather information includes at least one of the following. A detection state of the weather
information detection sensor group 60 (at least one of the solar radiation sensor 61, the
temperature sensor 62, and the illumination sensor 63). Weather information around the vehicle
received by the wireless communication unit 4 from the server 80. For example, date and time
information acquired from the navigation device 30. The GPS reception data described above
includes date and time information, which can be used.
[0040]
Next, the weather information acquired in step S17 is reflected on the leak volume (S18). As the
weather information to be reflected, at least one of the following is used, and a correction value
or correction coefficient corresponding to it is set. Weather: When the weather gets worse, the
sound travels far. Therefore, the leakage volume is set to increase as the weather gets worse.
Humidity: When humidity gets high, sound propagates far. Therefore, the leakage volume is set
to increase as the humidity increases. ・ Wind speed: When the wind speed is high, the sound
propagates to a distance. Therefore, the leakage volume is set to increase as the wind speed
increases. Temperature or solar radiation: During the daytime, the ground is warmed by solar
radiation, and the speed of sound near the surface is high. Therefore, the sound is refracted
upward (propagating upward) and it becomes difficult to transmit. On the other hand, at night,
the temperature near the surface drops due to radiation cooling, and conversely, the sound is
bent downward (downward propagation) and easily transmitted. Therefore, the leakage volume is
set to increase as the airiness decreases or as the amount of solar radiation decreases.
[0041]
The above-described configuration is that “the ambient state acquisition unit acquires weather
information of the area including the current position of the vehicle, and the leakage volume
estimation unit reflects the weather information on the leakage volume”. This configuration
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makes it possible to estimate the leak volume more accurately.
[0042]
Next, the date and time information acquired in step S17 is reflected on the leak volume (S19). As
the date and time information to be reflected, at least one of the following is used, and a
correction value or correction coefficient corresponding to it is set. Day and Night (The amount
of solar radiation may be used): During daytime and nighttime, attenuation by air absorption is
smaller at night and sound is more easily transmitted. Therefore, the leak volume is set to be
larger at night than at daytime. ・ Seasonal: The tendency of upward propagation is strong in
summer, and the tendency of downward propagation is strong in winter. Set the leak volume to
be higher in winter than in summer.
[0043]
The above-described configuration is that “the ambient state acquisition unit acquires date and
time information, and the ambient state acquisition unit reflects the date and time information on
the leak volume”. This configuration makes it possible to estimate the leak volume more
accurately.
[0044]
Next, ambient sound is estimated based on the current position of the vehicle (S20). The
relationship between the current position of the vehicle and the ambient sound is stored in
advance in the memory 3. For example, the map data is divided into a city area, a residential area,
a downtown area, a suburb, a farmland, a mountain forest, and a road type (general road /
highway), and ambient sound is set according to these divisions. In urban areas, residential areas,
downtown areas, and general roads, the influence of leakage volume is large, so set the ambient
sound small. In suburbs, farmland, forestry, and expressways, the influence of leak volume is
relatively small, so ambient noise should be set large. You may use the position of the lane in
which you are driving. For example, the ambient sound when traveling in a lane near the
sidewalk is set smaller than when traveling near the central separation band. That is, it can be
said that the ambient sound has the property of "the allowable value of leak volume".
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[0045]
The above-described configuration is that “the ambient state acquisition unit acquires current
position information reflecting the current position of the vehicle, and the ambient sound volume
estimation unit estimates the volume of the ambient sound based on the current position
information”. . This configuration makes it possible to estimate the leak volume more
accurately.
[0046]
Next, the human detection information acquired in step S17 is reflected on the ambient sound
(S21). For example, the correction value and the correction coefficient are set to decrease as the
number of people around the vehicle increases or as the density of people increases. The more
people there are, the greater the impact of noise.
[0047]
The above-described configuration is that “the ambient state acquisition unit acquires the
presence of a person around the vehicle, and the ambient volume estimation unit reflects the
presence of the person in the volume of the ambient sound”. Depending on the number of
people around the vehicle, the degree of influence of the noise on the surroundings also changes.
With this configuration, it is possible to estimate the volume of ambient sound more finely.
[0048]
Next, based on the leaked volume and the ambient sound, a recommended value of the volume in
the audio device 10 is calculated (S22). The calculation method uses one of the following. The
recommended value is a volume at which the ratio of the leak volume to the ambient sound
(noise level ratio) is a predetermined value. First, the allowable value of the leak volume is
calculated from the ambient sound and the noise level ratio. Next, a recommended value is
calculated from the allowable value of the leak volume and the open / close state of the window
of the vehicle, for example, using the above-mentioned map data. The present configuration is
such that “the recommended value calculation unit calculates the recommended value so that
the ratio of the leak volume to the volume of the ambient sound is a predetermined value”.
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According to this configuration, it is possible to make the leakage volume not be a noise level.
The recommended value is a volume at which the difference between the leak volume and the
ambient sound (noise level difference) is a predetermined value. First, the allowable value of the
leak volume is calculated from the ambient sound and the noise level difference. Next, a
recommended value is calculated from the allowable value of the leak volume and the open /
close state of the window of the vehicle, for example, using the above-mentioned map data.
[0049]
Finally, the volume recommended value information including the recommended value is output
to at least the audio device 10 via the LAN I / F 5 (S23). In the audio device 10, when the volume
recommended value information is acquired, the volume adjustment unit 12 adjusts the volume
to be the recommended value.
[0050]
The embodiments of the present invention have been described above, but these are merely
examples, and the present invention is not limited to these, as long as they do not deviate from
the scope of the claims, without departing from the knowledge of those skilled in the art. Various
changes based on are possible.
[0051]
1 vehicle noise suppression device 2 control unit (leakage volume estimation unit, ambient
volume estimation unit, recommended value calculation unit) 3 memory 4 wireless
communication unit (ambient condition acquisition unit, communication unit) 5 LAN I / F
(volume information acquisition unit , Vehicle condition acquisition unit, ambient condition
acquisition unit, output unit) 70 Mobile communication terminal
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