WO2012141326A1

WO2012141326A1 - Acoustic device for vehicle

Info

Publication number: WO2012141326A1
Application number: PCT/JP2012/060271
Authority: WO
Inventors: 秀樹大澤; 平二丸山; 鈴木　保之; 洋佑久野
Original assignee: ヤマハ発動機株式会社
Priority date: 2011-04-14
Filing date: 2012-04-16
Publication date: 2012-10-18
Also published as: JP2014131880A

Abstract

An acoustic device (20) for a vehicle is configured from a pressure sensor (21) for detecting the acoustic pressure of the suction noise of an engine (12) and for outputting said acoustic pressure as an acoustic pressure signal, a signal processing unit (23) for changing the acoustic pressure signal in accordance with the operational state of an automobile (10), and speakers (26a, 26b) for outputting the acoustic pressure signal as the suction noise of the engine (12). The pressure sensor (21) is disposed on a section of a suction duct (15) for connecting an air cleaner (16) with a throttle body (17), the aforementioned section being in the vicinity of an air flow meter (18) closer to the air cleaner (16) than to the center of the suction duct (15).

Description

Vehicle acoustic device

The present invention relates to an audio device for a vehicle for transmitting an intake sound of an engine of the vehicle to a passenger in the vehicle.

In recent vehicles such as automobiles, the noise generated in relation to the engine sound and the running state of the vehicle is made as small as possible in order to increase the comfort of passengers and not to emit noise outside the vehicle. However, according to this, there is a problem that the relevance between the actual traveling state such as the vehicle speed and the sound heard by the occupant is reduced, and the driving feeling of the automobile is lowered. For this reason, a vehicular acoustic device has been developed that emits engine sound from a speaker only toward the vehicle interior without emitting sound to the outside (see, for example, JP-A-2008-13064).

This vehicle acoustic device (driving sound transmission device) includes an engine intake intake and a sound pressure sensor disposed in an intake pipe, a rotation pulse sensor for detecting an ignition pulse of the engine, and an accelerator opening for detecting an accelerator pedal depression amount. A degree sensor, a speaker arranged in the engine room and the vehicle compartment, and a controller for outputting engine operation sound are provided. The controller also includes an order filter that changes the sound wave signal of the sound pressure sensor that is passed according to the input frequency from the rotation pulse sensor, and the opening signal from the accelerator opening sensor that is used to change the sound pressure of the sound wave signal that has passed the order filter. And a level adjuster that increases or decreases according to the condition. The sound wave signal output from the controller is amplified by the amplifier and output from the speaker.

However, in the above-described conventional vehicle acoustic device, the sound pressure sensor is attached to the outside air intake port of the air cleaner and the outside air intake port of the air duct arranged on the upstream side of the air cleaner, or the intake manifold. For this reason, when the sound pressure sensor is attached to the air cleaner and the outside air intake port of the air cleaner, the intake sound is reduced and it is difficult to detect the sound pressure of the intake sound. As a result, a highly accurate device is required as a device for reproducing the intake sound. In addition, when the sound pressure sensor is attached to the intake manifold, the fluctuation of the pulsation increases because it is close to the engine that generates the explosion sound, and the sound generated by the speaker becomes a sound with rough stimulation. is there. Further, when a microphone is used as a sound pressure sensor and attached to an air cleaner and an outside air intake port of the air cleaner, a sound from the outside is also detected and it is difficult to obtain a preferable engine intake sound.

The present invention has been made to address the above-described problems, and an object of the present invention is to provide a vehicular acoustic device capable of generating a comfortable sound close to an actual engine intake sound in the vehicle. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

In order to achieve the above-mentioned object, the structural feature of the vehicle acoustic device according to the present invention is that the intake sound of the engine (12, 42, 52) of the vehicle (10, 40, 50, 60, 70) In the vehicle acoustic device (20) for transmitting to an occupant, an air intake duct (16) connecting an air cleaner (16) provided on the intake port side for taking in external air and a throttle body (17) provided on the engine side 15) A pressure sensor (21) which is provided in the air cleaner side portion from the center and detects the pressure fluctuation of the intake air pulsation of the engine and outputs it as a pressure signal, and a signal which performs a process of changing the pressure signal according to the driving state of the vehicle A speaker (26a, 26b, 46a, which outputs a sound pressure signal installed in the vehicle and processed by the signal processing unit as an engine intake sound in the vehicle. 6b, 56,66a, 66b, 76a, 76b) and that with a certain.

The vehicle acoustic device according to the present invention makes it possible to hear the engine intake sound according to the driving condition by the driver's operation clearly in the vehicle while emitting the sound to the outside with a small sound. Further, in the present invention, since the pressure sensor is provided on the air cleaner side portion of the intake duct connecting the throttle body and the air cleaner, it is not affected by sound outside the vehicle such as traveling wind, driving sound of the engine, and explosion sound, It becomes possible to effectively detect the pressure fluctuation of the intake pulsation, so that the sound heard by the occupant in the vehicle is close to the actual intake sound of the engine. It should be noted that the engine sound that can be actually heard while the vehicle is running is heard from outside the upstream side of the air cleaner, and according to the present invention, the intake sound generated from the speaker is close to the actual intake sound. .

Another structural feature of the vehicle acoustic device according to the present invention is that an air flow meter (18) for detecting the air flow rate is installed in the vicinity of the air cleaner in the intake duct, and the pressure sensor is directed from the air flow meter toward the throttle body. Is provided in a portion within 20 cm. According to the present invention, the pulsation of the intake pressure generated in the intake duct can be detected by the pressure sensor with less noise. There are various lengths of intake ducts, but according to the experimental results, even if a short intake duct is used, it is good when the pressure sensor is provided within 20 cm from the air flow meter toward the throttle body. I was able to get a good result.

Still another structural feature of the vehicle acoustic device according to the present invention is that a tubular communication portion (21a) extending outward from the outer peripheral portion of the intake duct is provided, and a pressure sensor is installed at the tip of the communication portion, The distance between the base end portion on the intake duct side in the communication portion and the pressure sensitive portion provided in the pressure sensor is set within 4 cm.

When the frequency detected by the pressure sensor is 2 kHz or higher, for example, a sound uncomfortable for the passenger may be generated. For this reason, in the present invention, in order to prevent generation of unpleasant sound, it is preferable to use a pressure sensor having a sensitivity range of 1 to 2 kHz. In the case of this sensitivity range, it is possible to prevent resonance between the intake duct and the pressure sensor by making the length of the communication portion connecting the intake duct and the pressure sensor within 4 cm.

That is, when the sound speed of the intake sound is 340 m / sec and the frequency of the intake sound is 2 k Hertz, the wavelength is 340 m / 2000 Hertz, so it is 170 mm. And, in the case of a tubular body that is open at one end and closed at the other, such as a communicating portion that connects the intake duct and the pressure sensor, resonance occurs when the length is ¼ or more of the wavelength. Therefore, it becomes a case of 42.5 mm or more. For this reason, in consideration of some allowance, the distance between the intake duct and the pressure sensing part of the pressure sensor should be set within 4 cm so as to be shorter than a quarter wavelength of the frequency to be obtained. This can prevent the occurrence of resonance. According to the present invention, it is possible to prevent the detection of the pressure sensor from being adversely affected by providing the pressure sensor via the communication portion.

Still another structural feature of the vehicle acoustic device according to the present invention is that the pressure sensor measures both positive pressure and negative pressure. When a pressure sensor that can only measure negative pressure is used, if a positive pressure region occurs when the accelerator is stepped on suddenly, the sound generated by the speaker may be cracked. In the present invention, the pressure sensor measures both the positive pressure and the negative pressure, so that it is possible to detect the intake pulsation faithfully without erasing the intake pulsation even in the full load transient period.

Still another structural feature of the vehicular audio apparatus according to the present invention is that the speaker is arranged so as to be able to generate intake sound in a direction from the direction in which the engine in the vehicle is arranged toward the vehicle interior. According to the present invention, since the intake sound generated from the speaker can be heard from the direction in which the engine is disposed, it can be felt that the actual intake sound of the engine can be heard. Further, in the present invention, it is preferable that the speaker is arranged facing the driver's seat. According to this, since the intake sound is generated from the speaker toward the driver sitting in the driver's seat, the driver directly hears the intake sound. It becomes audible and the feeling of maneuvering increases.

Still another structural feature of the vehicular audio apparatus according to the present invention is that an odd number of speakers are provided, and one of the speakers (56) is arranged at the center in the width direction of the vehicle. The number of speakers may be an odd number or an even number, but in the case of an odd number, one speaker is arranged at the center in the vehicle width direction. As a result, the intake sound is not heard from one side in the vehicle width direction, and the balance in the direction in which the intake sound is heard is improved.

As another structural feature of the vehicle acoustic device according to the present invention, an arrangement in which the speaker is directly exposed in the vehicle interior, such as an audio speaker, can be considered, but the dashboard is located in the front of the vehicle interior of the vehicle. (71). In this case, it is preferable that the speaker is directly fixed to a part on the vehicle body side such as a wall surface of the dashboard. According to the present invention, the intake sound can be heard from the back side of the vehicle body, and the fluctuation feeling of the intake sound becomes natural. In addition, intake noise can be felt from the entire vehicle body using vibration propagation of the vehicle body.

Still another structural feature of the vehicle acoustic device according to the present invention includes a rotation sensor that detects the engine speed and an opening sensor that detects the opening of a throttle valve provided in the throttle body, and performs signal processing. Is to perform a process of changing the sound pressure signal using the engine speed detected by the rotation sensor and the throttle opening detected by the opening sensor.

According to the present invention, the intake sound output from the speaker can be reproduced in the vehicle interior as an intake sound having attenuation characteristics close to actual engine intake sound and transmission loss. The engine speed and the throttle opening are preferably used as parameters for amplifying the sound pressure level and the order component. As the opening sensor, a sensor that directly detects the rotation angle of the throttle valve or a sensor that detects the amount of accelerator depression as the throttle opening can be used. Furthermore, the vehicle speed detected by the vehicle speed sensor can be added as a parameter to the process of changing the sound pressure signal performed by the signal processing unit.

It is a top view showing the outline of the car provided with the audio equipment for vehicles concerning a 1st embodiment of the present invention. It is the schematic which showed the attachment position of the pressure sensor with which the acoustic apparatus for vehicles is provided. It is a block diagram of the audio equipment for vehicles. It is the schematic sectional drawing which showed the positional relationship of an intake duct and a pressure sensor. It is the graph which showed the pressure characteristic of the pressure sensor. It is the graph which showed the output waveform of the pressure sensor. It is the graph which showed the filter characteristic. It is a map of the sound pressure increase / decrease by engine speed and throttle opening. It is the top view which showed the outline of the motor vehicle provided with the vehicle audio apparatus which concerns on 2nd Embodiment of this invention. It is the top view which showed the outline of the motor vehicle provided with the audio equipment for vehicles which concerns on 3rd Embodiment of this invention. It is the top view which showed the outline of the motor vehicle provided with the vehicle audio apparatus which concerns on 4th Embodiment of this invention. It is the top view which showed the outline of the motor vehicle provided with the audio equipment for vehicles which concerns on 5th Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an automobile 10 provided with a vehicle acoustic device 20 (see FIG. 3) according to the embodiment. The vehicle 10 is configured by an FF (front engine / front drive) vehicle or an FR (front engine / rear drive) vehicle in which an engine 12 is disposed at the front center of the vehicle body 11. Are provided with a pair of front and rear wheels (not shown) and a handle 13, respectively. As shown in FIG. 2, an air cleaner 16 is connected to the engine 12 via a surge tank 14 and an intake duct 15, and a throttle body 17 is installed at a connecting portion between the surge tank 14 and the intake duct 15. An air flow meter 18 is installed at the end of the intake duct 15 on the air cleaner 16 side.

External air is taken into the air cleaner 16 through an air duct provided on the outside, and foreign matter is removed in the air cleaner 16 and sent to the intake duct 15. A throttle valve that opens and closes the air passage in the throttle body 17 by rotating about the shaft is disposed in the throttle body 17, and the air passing through the intake duct 15 depends on the opening of the throttle valve. Is sucked into the surge tank 14. The surge tank 14 temporarily stores air to relieve flow rate fluctuations, and equalizes the amount of air supplied to a plurality of cylinders included in the engine 12. The engine 12 generates a driving force by mixing the fuel supplied from the fuel system with air to cause an explosion. The air flow meter 18 detects the flow rate of air flowing from the air cleaner 16 to the intake duct 15.

As shown in FIG. 3, the vehicle acoustic device 20 includes a pressure sensor 21, an A / D converter 22, a signal processing unit 23, a D / A converter 24, an amplifier 25, and

speakers

26a and 26b. A control unit 27 is connected to the signal processing unit 23. Further, the vehicle acoustic device 20 also includes a rotation sensor 28, an opening degree sensor 29, a vehicle speed sensor 31, a changeover switch 32, and a memory unit 27a connected to the control unit 27. The pressure sensor 21 is connected to the vicinity of the air flow meter 18 in the intake duct 15 (see FIG. 2) by the tubular communication portion 21a shown in FIG. The pressure sensor 21 detects the pressure of air flowing through the intake duct 15 as a voltage.

FIG. 5 shows the pressure characteristics of the pressure sensor 21 and shows that the pressure applied to the pressure sensor 21 is proportional to the voltage generated thereby. Further, the pressure sensor 21 is constituted by a sensor that detects both positive pressure and negative pressure, and the solid line in FIG. 6 indicates an output indicating the relationship between pressure and time when the pressure sensor 21 detects pressure. It is a waveform. The broken line in FIG. 6 is an output waveform showing the relationship between pressure and time when the same pressure as the solid line is detected using a pressure sensor that detects only negative pressure. All values with "0" or more are cut. The sensitivity range of the pressure sensor 21 is between 1 Hz and 2 kHz.

The communication portion 21a is formed of a flexible resin pipe having an inner diameter of 3 mm, an outer diameter of 6 mm, and a length of 4 cm. It extends upward from the top. And the pressure sensor 21 is attached to the upper end of the communication part 21a. The pressure sensor 21 closes the upper end of the communication portion 21a with the pressure-sensitive portion facing the communication portion 21a. Moreover, the center part of the base end part of the communication part 21a is located in a part within 20 cm from the air flow meter 18. The pressure pulsation detected by the pressure sensor 21 is sent to the A / D converter 22 as an electric signal, converted into a digital signal by the A / D converter 22 and sent to the signal processing unit 23.

The signal processing unit 23 filters the digital signal sent from the A / D converter 22 to change the frequency characteristics, and includes

filters

23a and 23b. The filter 23a includes, for example, a plurality of filters a and b shown in FIG. The filter a indicated by the solid line in FIG. 7 increases the gain in each of the low frequency region and the high frequency region, and decreases the gain in the region between them. Further, the filter b indicated by a broken line in FIG. 7 decreases the gain in the low frequency region and the high frequency region, and increases the gain in the region between them. Although illustration is omitted, the filter 23a includes filters other than the filters a and b, and an arbitrary filter among these filters can be selected.

Then, for example, by selecting one of the filters a and b in FIG. 7, various changes such as changing the sound quality to the engine sound of a normal type car or the engine sound of a sport type car can be made. The filter 23b changes the overall gain of the filter characteristics of the filter 23a, and is configured by, for example, the map shown in FIG. This map generally increases the gain of the filter 23 a based on the rotational speed of the engine 12 detected by the rotation sensor 28 and the opening of the throttle valve detected by the opening sensor 29.

In the map of FIG. 8, the interval between the minimum value (0) and the maximum value of the engine speed rpm shown on the horizontal axis is divided into four equal parts, and the minimum value (0) of the throttle opening shown on the vertical axis. And the maximum value (100) are divided into five equal parts, and a gain that is increased in a region where each engine speed region and each throttle opening region intersect is described. Then, by using this map, the gain of the filter 23a is increased as a whole by performing interpolation based on numerical values obtained from the engine speed and the throttle opening. The digital signal processed by the signal processing unit 23 is converted into an analog signal by the D / A converter 24, amplified by the amplifier 25, and then output from the

speakers

26 a and 26 b.

The

speakers

26a and 26b are provided on the left and right of the front portion of the vehicle body 11, and as shown in FIG. 1, the speaker 26a is a small case provided on the left side of the dashboard provided on the front portion of the vehicle body 11. The speaker 26b is installed inside the wall panel on the right side of the dashboard. The

speakers

26a and 26b are both installed in a direction that allows sound generation from the engine 12 side toward the vehicle interior.

The control unit 27 is connected to the memory unit 27a, and the memory unit 27a stores a control program for controlling the vehicle acoustic device 20, various data, and the like. And the control part 27 runs the control program memorize | stored in the memory part 27a based on the signal from each sensor mentioned later. The rotation sensor 28 is installed in the vicinity of the engine 12, detects the rotation speed of the engine 12, and sends the detected value to the control unit 27 as a signal. The opening sensor 29 is installed on the shaft of the throttle valve, detects the rotation angle of the shaft as the opening of the throttle valve, and sends the detected value to the control unit 27 as a signal.

The vehicle speed sensor 31 is installed in the transmission, detects the traveling speed of the automobile 10, and sends the detected value as a signal to the control unit 27. The changeover switch 32 is installed on the front surface of the dashboard of the vehicle body 11 and is operated to select an arbitrary filter in the filter 23a. Although not shown, the vehicle acoustic device 20 includes a main switch for turning on and off the vehicle acoustic device 20, an operator and a speaker for adjusting the overall volume of the

speakers

26a and 26b. A localization operator for adjusting the localization of the sound by changing the volume balance of the sound generated from the

sounds

26a and 26b is provided. Moreover, the changeover switch 32 can perform remote operation using radio, and can switch the filter 23a using, for example, a mobile phone. The signal processing unit 23 can be rewritten via a mobile phone or the like.

Next, when the vehicle 10 configured as described above is driven, the operation when the vehicle acoustic device 20 is operated to generate the intake sound of the engine 12 from the

speakers

26a and 26b and the control performed by the control unit 27 will be described. To do. First, the changeover switch 32 is operated to select an arbitrary filter in the filter 23a. Next, the start switch is turned on to operate the engine 12, and the main switch of the vehicle acoustic device 20 is turned on. Then, the automobile 10 is driven by stepping on the accelerator. As a result, the control unit 27 determines a gain value to be amplified from the filter 23b based on the detection values sent from the rotation sensor 28 and the opening sensor 29, and selects the value in the filter 23a. Add to filter. Further, the filter 23a can be changed by operating the changeover switch 32 during traveling.

Thus, the pressure pulsation detected by the pressure sensor 21 is processed by the signal processing unit 23, and the

speakers

26 a and 26 b sound according to the filter characteristics processed by the signal processing unit 23. The intake sound generated from the

speakers

26 a and 26 b changes according to changes in the detected values of the pressure sensor 21, the rotation sensor 28 and the opening sensor 29. In addition, the intake sound generated from the

speakers

26a and 26b can be heard only by the passengers in the vehicle without leaking outside the vehicle when the window of the automobile 10 is closed.

Thus, in the vehicle acoustic device 20 according to the present embodiment, the pressure sensor 21 is provided in the vicinity of the air flow meter 18 in the intake duct 15. Therefore, the pulsation of the natural intake sound of the engine 12 is effective without being too close to the engine 12 and being affected by the explosion sound or being too close to the outside to make it difficult to detect the sound pressure of the intake sound. Can be detected. As a result, the intake sound generated from the

speakers

26 a and 26 b is close to the actual intake sound of the engine 12. In addition, the length between the center part of the base end part of the communication part 21a and the air flow meter 18 was calculated | required from experiment. In this experiment, when the length of the intake duct 15 is set to 40 cm as the shortest length, the length between the central portion of the base end portion of the communication portion 21a and the air flow meter 18 is within 20 cm. Good results could be obtained.

In this embodiment, a pressure sensor 21 having a sensitivity range of 1 to 2 kHz is used, and this pressure sensor 21 is connected to the outer periphery of the intake duct 15 by a tubular communication portion 21a having a length of 4 cm. ing. As described above, by changing the sensitivity range of the pressure sensor 21 from 1 Hz to 2 kHz, it is possible to generate only comfortable sounds on the

speakers

26a and 26b, excluding sounds uncomfortable for the occupant, and the communication portion 21a. By setting the length to 4 cm, it is possible to prevent resonance from occurring in the communication portion 21a.

That is, in the case of a tubular body in which the proximal end portion on the intake duct 15 side is opened and the distal end portion is closed by the pressure sensor 21 as in the communication portion 21a, resonance occurs because the length is 1/4 of the wavelength. Since it is the above case, by setting the length of the communication portion 21a to 4 cm, it can be made shorter than a quarter wavelength of the frequency to be obtained. Thus, the occurrence of resonance can be prevented, and the detection of the pressure sensor 21 can be prevented from being adversely affected by providing the pressure sensor 21 via the communication portion 21a. Further, since the communication portion 21a extends upward from the upper part of the outer peripheral surface of the intake duct 15, even if oil accumulates inside the intake duct 15, it can be prevented from flowing to the pressure sensor 21 side. Further, since the pressure sensor 21 can measure both the positive pressure and the negative pressure, it is possible to faithfully take out all the intake pulsations without erasing them.

Furthermore, because the

speakers

26a and 26b are arranged on the left and right sides of the dashboard at the front of the vehicle body 11 so that sound can be generated from the engine 12 side toward the interior of the vehicle, the intake sound generated from the

speakers

26a and 26b The sound can be heard from the direction of the engine 12, and it can be felt that the actual intake sound of the engine 12 can be heard.

In this embodiment, the map of the filter 23b for amplifying the sound pressure signal is based on the engine speed detected by the rotation sensor 28 and the throttle opening detected by the opening sensor 29. Therefore, the sound output from the

speakers

26a and 26b can be reproduced as a sound having an attenuation characteristic close to the actual intake sound of the engine 12 and a transmission loss. Further, the filter 23a includes a plurality of filters, and any filter can be selected. Therefore, the sound output from the

speakers

26a and 26b can be changed to an arbitrary one, and the volume and sound localization can also be changed. can do.

(Second Embodiment)
FIG. 9 schematically shows an automobile 40 provided with the vehicle acoustic device according to the second embodiment of the present invention. The automobile 40 is configured by an MR (midship engine / rear drive) vehicle or an RR (rear engine / rear drive) vehicle in which an engine 42 is disposed at the center of the rear portion of a vehicle body 41. A pair of

speakers

46 a and 46 b are provided on the left and right of the rear seat of the vehicle body 41. The

speakers

46a and 46b are both installed in a direction in which sound can be produced from the engine 42 side toward the vehicle interior. The rotation sensor 48 is provided in the engine 42. An opening sensor for detecting the opening of the throttle valve is provided in the throttle body. The configuration of the other parts of the vehicle acoustic device provided in the automobile 40 is the same as that of the vehicle acoustic device 20 described above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the

speakers

46a and 46b are arranged on the left and right sides behind the rear seat of the vehicle body 41 so that sound can be emitted from the engine 42 side installed at the rear of the vehicle body 41 toward the vehicle interior. The intake sound generated from 46a and 46b can be heard from the direction of the engine 42, and it can be felt that the actual intake sound of the engine 42 can be heard. Other functions and effects of the vehicle acoustic device according to the second embodiment are the same as those of the vehicle acoustic device 20 described above.

(Third embodiment)
FIG. 10 shows an outline of an automobile 50 including a vehicle acoustic device according to the third embodiment of the present invention. Similar to the automobile 10 of the first embodiment described above, the automobile 50 is configured by an FF vehicle or an FR vehicle in which an engine 52 is disposed at the front center of the vehicle body 51. In place of the

speakers

26 a and 26 b of the automobile 10, one speaker 56 is provided on the dashboard at the front of the vehicle body 51. The speaker 56 is installed in a direction in which sound can be generated from the engine 52 side toward the vehicle interior. The configuration of the other parts of the vehicle acoustic device provided in the automobile 50 is the same as that of the vehicle acoustic device 20 described above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the speaker 56 is arranged on the dashboard at the front portion of the vehicle body 51 so that sound can be emitted from the engine 52 side installed at the front portion of the vehicle body 51 toward the inside of the vehicle. Inspired sound does not vary from side to side and can be heard in a balanced manner. The other effects of the vehicle acoustic device according to the third embodiment are the same as those of the vehicle acoustic device 20 described above.

(Fourth embodiment)
FIG. 11 schematically shows an automobile 60 provided with the vehicle acoustic device according to the fourth embodiment of the present invention. The automobile 60 is configured by an FF vehicle or an FR vehicle, which is the same as the automobile 10 of the first embodiment described above. The automobile 10 is further provided with a pair of

speakers

66a and 66b. The speaker 66a is installed indoors on the front left door, and the speaker 66b is installed indoors on the front right door. The configuration of the other parts of the vehicle acoustic device provided in the automobile 60 is the same as that of the vehicle acoustic device 20 described above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the intake sound generated from the

speakers

26a and 26b can be heard from the direction of the engine 12, and the intake sound generated from the

speakers

66a and 66b can be heard from the left and right sides of the vehicle body 11, thus providing a three-dimensional effect. You can hear the intake sound. Other functions and effects of the vehicle acoustic device according to the fourth embodiment are the same as those of the vehicle acoustic device 20 described above.

(Fifth embodiment)
FIG. 12 shows an outline of an automobile 70 including a vehicle acoustic device according to the fifth embodiment of the present invention. This automobile 70 is configured by an FF vehicle or an FR vehicle, which is the same as the automobile 10 of the first embodiment described above, and has a configuration in which

speakers

76a and 76b are provided instead of the

speakers

26a and 26b of the automobile 10. ing. The

speakers

76 a and 76 b are installed in the dashboard 71. The configuration of the other parts of the vehicle acoustic device provided in the automobile 70 is the same as that of the vehicle acoustic device 20 described above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the intake sound can be heard from the back side of the vehicle body 11, and the fluctuation feeling of the intake sound becomes natural. In addition, the intake sound can be felt from the entire vehicle body 11 by utilizing the vibration propagation of the vehicle body 11. Other functions and effects of the vehicle acoustic device according to the fifth embodiment are the same as those of the vehicle acoustic device 20 described above.

Further, the vehicle acoustic device according to the present invention is not limited to the embodiment described above, and can be implemented with appropriate modifications. For example, in the above-described embodiment, the signal processing unit 23 performs the process of changing the sound pressure signal using the engine speed detected by the rotation sensor 28 and the throttle opening detected by the opening sensor 29. In this process, the vehicle speed detected by the vehicle speed sensor 31 can be added as a parameter. Each of the

speakers

26a and 26b described above may be provided as a dedicated speaker for the vehicle acoustic device 20, or may be used in combination with an audio speaker provided in the automobile 10 or the like.

Claims

In the vehicle acoustic device for transmitting the intake sound of the vehicle engine to the passengers in the vehicle,
Detects the pressure of the intake air pulsation of the engine provided at the air cleaner side part from the center of the intake duct connecting the air cleaner provided on the intake port side for taking in external air and the throttle body provided on the engine side A pressure sensor that outputs a pressure signal;
A signal processing unit that performs a process of changing the pressure signal according to the driving state of the vehicle;
A vehicle acoustic device comprising: a speaker installed in the vehicle and outputting a sound pressure signal processed by the signal processing unit as an intake sound of the engine.
2. The vehicle according to claim 1, wherein an air flow meter that detects an air flow rate is installed in the intake duct in the vicinity of the air cleaner, and the pressure sensor is provided in a portion within 20 cm from the air flow meter toward the throttle body. Acoustic device.
A tubular communication portion extending outward from the outer peripheral portion of the intake duct is provided, and the pressure sensor is installed at a distal end of the communication portion, and a proximal end portion on the intake duct side in the communication portion, and the pressure sensor The vehicle acoustic device according to claim 1 or 2, wherein a distance between the pressure sensing unit and the pressure sensor is provided within 4 cm.
4. The vehicle acoustic device according to claim 1, wherein the pressure sensor measures both positive pressure and negative pressure.
The vehicle acoustic device according to any one of claims 1 to 4, wherein the speaker is disposed so as to be able to generate an intake sound in a direction from the direction in which the engine in the vehicle is disposed toward the vehicle interior.
The vehicle acoustic device according to any one of claims 1 to 5, wherein an odd number of the speakers are provided, and one of the speakers is disposed at a central portion in the width direction of the vehicle.
The vehicle acoustic device according to any one of claims 1 to 6, wherein the speaker is disposed in a dashboard located in a front part of the vehicle compartment of the vehicle.
A rotation sensor for detecting the rotation speed of the engine and an opening degree sensor for detecting an opening degree of a throttle valve provided in the throttle body, wherein the signal processing unit detects the rotation speed of the engine detected by the rotation sensor and The vehicle acoustic device according to any one of claims 1 to 7, wherein a process of changing the sound pressure signal is performed using a throttle opening detected by an opening sensor.