JP2015063156A - Noise suppression device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise suppression device for vehicle capable of preventing trouble from being caused for the neighborhood with a simple configuration, when a sound volume inside a vehicle is loud.SOLUTION: A noise suppression device for vehicle includes: a sound volume information acquisition part which acquires sound volume information including the sound volume inside a vehicle; a vehicle state acquisition part which acquires the state of the vehicle; a leakage sound volume estimation part which estimates a leakage sound volume from the interior of the vehicle to the outside of the vehicle in the sound volume inside the vehicle on the basis of a state of the vehicle; a peripheral state acquisition part which acquires a state of the periphery of the vehicle; an ambient sound volume estimation part which estimates a sound volume of ambient sound generated in the periphery of the vehicle on the basis of the state of the periphery of the vehicle; a recommended value calculation part which calculates a recommended value of the sound volume inside the vehicle on the basis of the leakage sound volume and sound volume of ambient sound; and an output part which outputs sound volume recommended value information including the recommended value to an external device.

Description

  The present invention relates to a vehicle noise suppression device that suppresses noise to the surroundings due to sound in a passenger compartment.

  There is a driver who travels while reproducing an acoustic signal from an audio device of a vehicle at a loud volume that blocks sound outside the vehicle. If the window is opened in such a state, there is a possibility of causing noise damage to the surroundings of the vehicle. Therefore, when the window is opened, it is necessary to control the volume so as not to cause noise damage.

  Therefore, in order to prevent external noise such as siren sound of an emergency vehicle and alarm sound of a railroad crossing from entering the vehicle interior when the window is opened, noise is reduced by using the vehicle interior S / N ratio input means. A vehicle interior environment control system has been devised in which the relative level of the musical sound is increased with the reduction of the level in mind and the relative level of the musical sound can be freely adjusted while reducing the burden on hearing (see Patent Document 1).

  In addition, when the volume in the passenger compartment is equal to or higher than the specified volume, and there is an open window among the windows of the vehicle, it is possible for the vehicle to prevent the surroundings from being disturbed by closing the open window. A noise prevention device has been devised (see Patent Document 2).

Japanese Patent No. 4711082 JP 2007-056533 A

  Patent document 1 aims at enabling passengers in the vehicle to enjoy music 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.

  In Patent Document 2, the vehicle window is closed when the volume in the passenger compartment is equal to or higher than the specified volume. However, when it is necessary to keep the window open for ventilation or the like, user convenience and comfort are improved. There is a possibility of damage. It is also conceivable that a passenger (especially a child) may be surprised when the window closes suddenly. Further, when the window is closed, the sound leaking outside the vehicle decreases, and the volume of the passenger compartment increases accordingly, which may make the passenger feel uncomfortable. It cannot be applied to a vehicle having a structure in which the window cannot be automatically opened and closed.

  Against the background of the above problems, an object of the present invention is to provide a vehicle noise suppression device that can prevent the surroundings from being disturbed when the volume in a vehicle interior is high with a simpler configuration.

  A vehicle noise suppression device for solving the above problems is based on a volume information acquisition unit that acquires volume information including a volume in a vehicle interior of a vehicle, a vehicle state acquisition unit that acquires a vehicle state, and a vehicle state. Based on the leakage volume estimation unit that estimates the leakage volume from the passenger compartment to the outside of the vehicle, the ambient state acquisition unit that acquires the surrounding state of the vehicle, and the surrounding state of the vehicle, Includes an ambient volume estimator that estimates the volume of ambient sounds generated around the vehicle, a recommended value calculator that calculates the recommended volume of the vehicle interior based on the leakage volume and ambient sound volume, and a recommended value And an output unit that outputs recommended sound volume value information to an external device.

  The present invention suppresses noise to the surroundings due to the sound in the passenger compartment without closing the window as in Patent Document 2. With the above configuration, noise outside the vehicle can be suppressed even when the window is opened, and the convenience and comfort of the user who wants to keep the window open can be ensured. Also, since the windows do not close suddenly, the passengers (especially children) are not surprised. It can also be applied to a vehicle having a structure in which the window cannot be automatically opened and closed.

  Further, in the present invention, it is highly possible that the surroundings of the vehicle will be disturbed by taking into account the open / closed state of the window and the state of the vehicle, rather than determining whether or not the noise is generated only by the volume in the vehicle interior. Only when the volume control. Therefore, the frequency at which the volume is suppressed is reduced, and the frequency at which an occupant who is listening to music in the passenger compartment feels uncomfortable due to the volume being reduced is also reduced.

The figure which shows the structural example of the noise suppression apparatus for vehicles of this invention. The flowchart explaining a noise suppression process.

  The configuration of the present invention will be described below with reference to the drawings. In FIG. 1, the structure of the vehicle noise suppression apparatus 1 of this invention and a related apparatus is shown. The vehicle noise suppression device 1 includes a control unit 2 (leakage sound volume estimation unit, ambient sound volume estimation unit, recommended value calculation unit of the present invention) including a well-known CPU, ROM, RAM (all not shown) and the like. To communicate with other vehicle devices via the memory 3 for storing necessary data, the wireless communication unit 4 (peripheral state acquisition unit, communication unit of the present invention) that performs wireless communication with an external device, and the in-vehicle LAN 90 LAN I / F5 (volume information acquisition unit, vehicle state acquisition unit, ambient state acquisition unit, output unit of the present invention).

  A control program is stored in the ROM (or memory 3) of the control unit 2, and various functions of the vehicle noise suppression device 1 are realized by the CPU executing the control program.

  The wireless communication unit 4 is, for example, a tablet-type terminal represented by a well-known smartphone possessed by a user (a general term for a portable information terminal equipped with a touch panel on a display portion such as a liquid crystal display and operated with a finger), a mobile phone ( These are collectively referred to as a portable communication terminal 70) and an external facility such as the server 80.

  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.

  The vehicle noise suppression device 1 may be included in the audio device 10 or the navigation device 30, that is, a device that outputs an acoustic signal.

  The audio device 10 is a device that reproduces various music media and receives radio signals and outputs them as sound. Note that the navigation device 30 described later may have such an audio function. The audio device 10 includes an operation unit 11 that allows an occupant to perform operations such as reproduction of music, and a volume adjustment unit 12 that adjusts the volume. The audio device 10 can also adjust the volume based on a control command (recommended sound volume value information of the present invention) from the vehicle noise suppression device 1.

  The power window ECU 20 controls opening and closing of a vehicle window (corresponding to each seat, not shown). 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) that opens and closes each window, and is an open / close switch operated by a passenger. The corresponding drive motor is driven to open and close the window. Moreover, the open / close state detection part 21 which detects the open / close state of a window is included. The power window mechanism may not be provided and only the open / close state detection unit 21 may be configured.

  The navigation device 30 is a known device that detects the current position of the vehicle and displays a map around the current position on the screen and a mark indicating the current position on the map. 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.

  Each of the position detectors 31 has a well-known geomagnetic sensor, gyroscope, distance sensor, and GPS receiver for GPS (Global Positioning System) that detects the position of the vehicle based on radio waves from the satellite, Use while complementing.

  The map data input unit 32 displays background data, a place name, and the like for displaying a background relating to terrain and facilities when displaying road map data indicating a road connection structure and a road map using the road map data. Are input to a control circuit (not shown) that controls various processes of the navigation device 30.

  The road map data includes node data regarding points where a plurality of roads intersect, merge and branch, and link data regarding roads connecting the points. The node data includes a node ID for identifying a 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 for identifying a road, a link length, start and end coordinates, a road type such as an expressway and a general road, road width, link travel time, and gradient.

  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 known wheel speed sensor that generates wheel speed pulses using a 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 is described in detail in JP 2013-170980 A. Moreover, you may detect a vibration using a wheel speed sensor. Details are described in JP-A No. 2005-1112017. Further, the vibration level of the vehicle may be detected based on the detection state of the air pressure sensor that detects the air pressure of the tire of the vehicle (that is, the change in air pressure).

  The state of the road surface can be estimated from the detection state of the vibration sensor 42. That is, when the vibration in a predetermined range continues for a predetermined time, it can be estimated that the vehicle is traveling on an unpaved road, a gravel road, and a road with unevenness (so-called bad road).

  The human detection sensor group 50 includes a radar 51 that detects an object around the vehicle, a camera 52 that captures an image around the vehicle, and an infrared sensor 53 that detects an object around the vehicle. The human detection sensor group 50 is provided, for example, in a known vehicle antitheft device that prevents the vehicle from being stolen. 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 that is included in a known airbag device and detects whether or not an occupant is seated in a seat.

  The meteorological 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 well-known vehicle air conditioner that performs air conditioning in the passenger compartment. The illuminance sensor 63 is provided 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.

The noise suppression process included in the above-described control program and repeatedly executed by the control unit 2 at a predetermined timing will be described with reference to FIG. First, a vehicle state is acquired via in-vehicle LAN 90 (S11). The vehicle state includes the following, but here, at least the open / close state of the vehicle window is acquired.
The open / close state of the vehicle window (obtained from the power window ECU 20).
Vehicle speed (acquired detection value of the vehicle speed sensor 41).
-Vehicle vibration state (acquired detection value of vibration sensor 42).

  Next, it is determined whether there is an open window based on the open / closed state of the vehicle window. When there is no open window (S12: No), this process is terminated. On the other hand, when there is an open window (S12: Yes), volume information including the volume set by the volume adjustment unit 12 is acquired from the audio device 10 (S13).

  Depending on the sound volume, sound may leak out of the vehicle even when the window is fully closed, so step S12 may not be executed, and the processing after step S13 may be executed regardless of the open / closed state of the window.

Next, the leakage volume that leaks out of the vehicle is estimated based on the degree of opening of the window and the volume (S14). For example, the leak volume is stored in the memory 3 as map data in advance for each combination with a vehicle type and an audio device. Any of the following may be used as the map data setting method.
For example, map data is the leak volume when the opening degree of a predetermined open state of the window is changed as in the driver's seat side window or the sidewalk side (left side of the vehicle if left-side traffic).
The map volume is the leakage volume when the open state of all windows is changed in the same way.
・ For each window, the leakage volume when the opening degree of the open state is changed is used as map data. When a plurality of windows are open, the sum of the respective leakage volumes is taken as the vehicle leakage volume.
The open state of the window used for measurement is, for example, full open, 3/4 open, half open, or 1/4 open. When the opening is other than the above, the leak volume is obtained by map interpolation. The measurement position is the sidewalk side of the vehicle.

  The above-described configuration is “the vehicle state acquisition unit acquires the open / closed state of the window of the vehicle, and the leak volume estimation unit estimates the leak volume based on the open / closed state”. With this configuration, the leak volume can be estimated with a simple configuration.

  Next, the vehicle speed is reflected in the leakage volume (S15). For example, a correction value (which may be positive or negative) according to the vehicle speed is added to the leakage volume. Alternatively, the leakage coefficient is multiplied by a correction coefficient (a number greater than or equal to zero) according to the vehicle speed. The correction value or correction coefficient is stored in the memory 3 in advance. The same applies when reflecting various states in subsequent steps. This configuration is “the vehicle state acquisition unit acquires the speed of the vehicle, and the leak volume estimation unit reflects the speed of the vehicle in the leak volume”. With this configuration, the leak volume can be estimated more accurately.

  For example, the above-described correction value and correction coefficient are maximum when the vehicle speed is zero, and decrease as the vehicle speed increases. For a pedestrian, when the vehicle is stopped, the time affected by the leakage volume (that is, noise) is long, so the correction value and coefficient are increased. On the other hand, when the vehicle is traveling, the time affected by the leakage volume is short, and the leakage volume is attenuated by the running sound and wind noise, so the correction value and coefficient are reduced.

  Next, the vibration state of the vehicle is reflected in the leakage volume (S16). This configuration is “the vehicle state acquisition unit acquires the vibration of the vehicle, and the leakage volume estimation unit reflects the vibration of the vehicle in the leakage volume”. With this configuration, the leak volume can be estimated more accurately.

  The above-described correction value and correction coefficient are, for example, maximum when the vibration is zero 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 a paved road. Therefore, the amount of leakage volume reduction due to the traveling sound is small, and the correction value and 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 leakage volume reduction due to the traveling sound is large, and the correction value and correction coefficient are set small.

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 / time information. 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.

The human detection information uses at least one of the following.
A human detection state by the human detection sensor group 50 (at least one of the radar 51, the camera 52, and the infrared sensor 53). From this detection state, the number or density of people around the vehicle can be known.
The reception state of radio waves of the mobile communication terminal 70 in the wireless communication unit 4. For example, 2.4 GHz band or 5 GHz band is used for wireless LAN communication of a tablet terminal. Moreover, in a mobile phone, a communication frequency band is determined according to a 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 status of each channel or the intensity of the received radio wave. This configuration is “the ambient state acquisition unit includes a communication unit that communicates with mobile communication terminals owned by people around the vehicle, and based on the communication result between the communication unit and the mobile communication terminal, "Get the presence of a person". It is said that the household penetration rate of mobile phones in recent years has exceeded 90%. The mobile phone always communicates with the base station. With this configuration, the presence of people around the vehicle can be acquired with a simple configuration.

The weather information includes at least one of the following.
The 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 illuminance sensor 63).
Weather information around the vehicle received by the wireless communication unit 4 from the server 80.
For example, date / time information acquired from the navigation device 30. Since the GPS reception data described above includes date and time information, it can be used.

Next, the weather information acquired in step S17 is reflected in the leakage volume (S18). The reflected weather information uses at least one of the following, and sets a correction value or a correction coefficient according to it.
・ Weather: When the weather gets worse, the sound propagates far away. Thus, the sound volume is set to increase as the weather gets worse.
・ Humidity: When the humidity is high, sound propagates far away. Therefore, the leakage volume is set to increase as the humidity increases.
・ Wind speed: When the wind speed increases, sound propagates far away. Accordingly, the leakage volume is set to increase as the wind speed increases.
・ Temperature or amount of solar radiation: During the day, the ground is warmed by solar radiation, and the speed of sound near the surface increases. For this reason, the sound is refracted upward (propagating upward) and becomes difficult to propagate. On the other hand, at night, the temperature near the surface of the earth decreases due to radiation cooling, and conversely, the sound is bent downward (propagating downward) and easily propagates. Therefore, the leakage volume is set to increase as the mood decreases or the amount of solar radiation decreases.

  The above-described configuration is “the ambient state acquisition unit acquires the weather information of the region including the current position of the vehicle, and the leakage volume estimation unit reflects the weather information in the leakage volume”. With this configuration, the leak volume can be estimated more accurately.

Next, the date and time information acquired in step S17 is reflected in the leakage volume (S19). As the date and time information to be reflected, at least one of the following is used, and a correction value or a correction coefficient corresponding thereto is set.
-Day and night (the amount of solar radiation may be used): During the day and at night, the attenuation by air absorption is smaller at night and the sound is more easily transmitted. Therefore, the leakage volume is set to be larger at night than during the day.
・ Season: The tendency of upward propagation is strong in summer, and the tendency of downward propagation is strong in winter. Set so that the leakage volume is higher in winter than in summer.

  The configuration described above is “the ambient state acquisition unit acquires date and time information, and the ambient state acquisition unit reflects the date and time information in the leakage volume”. With this configuration, the leak volume can be estimated more accurately.

  Next, ambient sounds are estimated based on the current position of the vehicle (S20). The relationship between the current position of the vehicle and ambient sounds is stored in the memory 3 in advance. For example, the map data is divided into urban areas, residential areas, downtown areas, suburbs, farmlands, forests, road types (general roads / highways), and ambient sounds are set according to these classifications. In urban areas, residential areas, downtown areas, and general roads, the influence of leakage volume is large, so ambient sounds are set low. In suburbs, farmland, forests, and highways, the influence of leakage volume is relatively small, so the ambient sound is set high. You may use the position of the running lane. For example, the ambient sound when traveling in a lane near a sidewalk is set to be smaller than that when traveling near a median. In other words, it can be said that the ambient sound has the character of “allowable value of leakage volume”.

  The above-described configuration is “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 sound volume of ambient sound based on the current position information”. . With this configuration, the leak volume can be estimated more accurately.

  Next, the human detection information acquired in step S17 is reflected in 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. It is judged that the more people there are, the greater the influence of noise.

  The configuration described above is “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”. The degree of the influence of noise on the surroundings also changes depending on the number of people around the vehicle. With this configuration, the volume of the ambient sound can be estimated more finely.

Next, based on the leakage volume and the ambient sound, a recommended value for the volume in the audio device 10 is calculated (S22). Any of the following is used as the calculation method.
-The recommended volume is the volume at which the ratio between the leakage volume and ambient sound (noise level ratio) is a predetermined value. First, an allowable value for the leakage volume is calculated from the ambient sound and the noise level ratio. Next, a recommended value is calculated from the allowable value of the leakage volume and the open / closed state of the vehicle window using, for example, the map data described above. This configuration is “the recommended value calculation unit calculates the recommended value so that the ratio of the leakage volume and the volume of the ambient sound becomes a predetermined value”. With this configuration, the leakage volume can be set to a level that does not feel noise.
-The recommended volume is the volume at which the difference between the leakage volume and the ambient sound (noise level difference) is a predetermined value. First, an allowable value of the leakage sound volume is calculated from the ambient sound and the noise level difference. Next, a recommended value is calculated from the allowable value of the leakage volume and the open / closed state of the vehicle window using, for example, the map data described above.

  Finally, the recommended sound volume value information including the recommended value is output to at least the audio apparatus 10 via the LAN I / F 5 (S23). In the audio device 10, when the recommended volume value information is acquired, the volume adjustment unit 12 adjusts the volume so that the recommended value is obtained.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

DESCRIPTION OF SYMBOLS 1 Vehicle noise suppression apparatus 2 Control part (leakage sound volume estimation part, ambient sound volume estimation part, recommended value calculation part)
3 memory 4 wireless communication unit (ambient state acquisition unit, communication unit)
5 LAN I / F (volume information acquisition unit, vehicle state acquisition unit, ambient state acquisition unit, output unit)
70 Mobile communication terminal

Claims (10)

A volume information acquisition unit for acquiring volume information including the volume in the passenger compartment of the vehicle;
A vehicle state acquisition unit for acquiring the state of the vehicle;
A leakage volume estimation unit for estimating a leakage volume from the vehicle interior to the outside of the vehicle based on the state of the vehicle,
An ambient condition acquisition unit that acquires an ambient condition of the vehicle;
An ambient sound volume estimation unit that estimates a sound volume of ambient sounds generated around the vehicle based on a state around the vehicle;
A recommended value calculation unit for calculating a recommended value of the volume in the vehicle interior based on the leakage volume and the volume of the ambient sound;
An output unit for outputting recommended volume information including the recommended value to an external device;
A vehicle noise suppression device comprising:   The vehicle noise suppression device according to claim 1, wherein the recommended value calculation unit calculates the recommended value so that a ratio between the leakage volume and the volume of the ambient sound is a predetermined value. The vehicle state acquisition unit acquires an opening / closing state of the window of the vehicle,
The vehicle noise suppression device according to claim 1, wherein the leak volume estimation unit estimates the leak volume based on the open / closed state. The vehicle state acquisition unit acquires the speed of the vehicle,
The vehicle noise suppression device according to any one of claims 1 to 3, wherein the leak volume estimation unit reflects a speed of the vehicle in the leak volume. The vehicle state acquisition unit acquires the vibration of the vehicle,
The vehicle noise suppression device according to any one of claims 1 to 4, wherein the leakage volume estimation unit reflects vibrations of the vehicle in the leakage volume. The ambient state acquisition unit acquires local weather information including the current position of the vehicle,
The vehicle noise suppression device according to any one of claims 1 to 5, wherein the leak volume estimation unit reflects the weather information on the leak volume. The ambient state acquisition unit acquires date and time information,
7. The vehicle noise suppression device according to claim 1, wherein the ambient state acquisition unit reflects the date and time information in the leakage volume. The ambient state acquisition unit acquires current position information reflecting the current position of the vehicle,
The vehicle ambient noise suppression device according to claim 1, wherein the ambient sound volume estimation unit estimates a sound volume of the ambient sound based on the current position information. The ambient state acquisition unit acquires the presence of people around the vehicle,
The vehicle noise suppression device according to any one of claims 1 to 8, wherein the ambient sound volume estimation unit reflects the presence of the person in the sound volume of the ambient sound. The ambient state acquisition unit includes a communication unit that communicates with a mobile communication terminal possessed by a person around the vehicle,
The vehicle noise suppression device according to claim 9, wherein the presence of a person around the vehicle is acquired based on a communication result between the communication unit and the mobile communication terminal.

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