WO2018186069A1

WO2018186069A1 - Vehicle power source noise reduction device

Info

Publication number: WO2018186069A1
Application number: PCT/JP2018/007788
Authority: WO
Inventors: 伊藤　篤史
Original assignee: アイシン精機株式会社
Priority date: 2017-04-04
Filing date: 2018-03-01
Publication date: 2018-10-11
Also published as: JP2018180059A

Abstract

This vehicle power source noise reduction device: is to be arranged inside a housing part that houses a vehicle power source that is for driving a vehicle; reduces noise emitted from the vehicle power source; and comprises a speaker that generates cancellation sound that is antiphase to the noise. The speaker is arranged to emit the cancellation sound: in a direction that is along the emission direction of the noise emitted from the vehicle power source; and toward an opening part that connects the housing part to the outside.

Description

Vehicle power source noise reduction device

The present invention relates to a vehicle power source noise reduction device, and more particularly to a vehicle power source noise reduction device that reduces noise radiated from a vehicle power source.

Conventionally, a vehicle power source noise reduction device that reduces noise radiated from a vehicle power source is known. Such a vehicle power source noise reduction device is disclosed in, for example, Japanese Patent Laid-Open No. 2-306845.

Japanese Patent Laid-Open No. 2-306845 discloses a technique for reducing noise caused by an engine explosion at the driver's ear (listening point) in the passenger compartment behind the engine housing section (engine room) in which the engine is housed. A vehicle interior noise reduction device is disclosed. The vehicle interior noise reduction device includes a speaker provided in the vehicle interior, and a control unit that adjusts the phase and sound pressure of the sound so as to reduce the noise at the listening point and outputs the sound to the speaker.

JP-A-2-306845

However, in the vehicle interior noise reducing device described in Japanese Patent Laid-Open No. 2-306845, noise caused by the engine can be reduced at one point in the passenger compartment as the listening point. There is an inconvenience that noise leaking from the engine room to the outside of the vehicle is not reduced. For this reason, there is a problem that noise leaking outside the vehicle (outside the vehicle) cannot be sufficiently reduced.

The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a vehicle power source noise reduction device capable of sufficiently reducing noise leaking outside the vehicle. It is to be.

In order to achieve the above object, a vehicle power source noise reduction device according to one aspect of the present invention is arranged in a housing portion in which a vehicle power source for driving a vehicle is housed and radiated from the vehicle power source. A speaker that generates a canceling sound having a phase opposite to that of the noise. The speaker is an opening that communicates between the housing portion and the outside of the vehicle in a direction along the radiation direction of the noise radiated from the vehicle power source. It arrange | positions so that a cancellation sound may be radiated | emitted toward a part.

In the vehicle power source noise reduction device according to one aspect of the present invention, as described above, the speaker is in a direction along the radiation direction of the noise radiated from the vehicle power source and is accommodated in which the vehicle power source is accommodated. The canceling sound is radiated toward the opening provided in the portion. Thereby, since a cancellation sound can be radiated | emitted from the opening part of an accommodating part, the noise which leaks out of a vehicle can be reduced. In addition, noise that leaks out of the vehicle from the opening of the housing, which tends to generate a large sound pressure, compared to the noise that leaks out of the vehicle from the portion other than the opening of the housing is caused by the canceling sound radiated toward the opening. It can be effectively reduced. As a result, noise leaking out of the vehicle can be sufficiently reduced.

In the vehicle power source noise reduction device according to the above aspect, preferably, a plurality of speakers are provided, and each of the plurality of speakers is associated with each of a plurality of openings provided in the housing portion. The canceling sound is radiated toward the corresponding opening.

According to this configuration, noise leaking out of the vehicle from each of the plurality of openings can be effectively reduced by the canceling sound radiated from the corresponding speaker. Can be reduced.

In this case, preferably, the opening of the housing portion includes a first opening formed on the side of the housing portion opposite to the vehicle interior, and a second opening formed at least on the bottom of the housing portion, The plurality of speakers includes a first speaker arranged to radiate a cancellation sound toward the first opening, and a second speaker arranged to radiate a cancellation sound toward the second opening. .

If comprised in this way, the noise which leaks out of a vehicle from the 1st opening part formed in the other side of the vehicle interior of the accommodating part and the 2nd opening part formed in at least the bottom part of the accommodating part, respectively, The canceling sound emitted from the corresponding first speaker and second speaker can be effectively reduced.

In the configuration in which the plurality of speakers include the second speaker, preferably, the second opening is formed across the bottom and the side of the accommodating portion, and the second speaker is the second opening, One speaker arranged to radiate a canceling sound toward the first opening formed over the one side of the side and the bottom of the one side, and the side of the second opening And the other speaker arranged to radiate a canceling sound toward the second opening formed on the other side and the bottom on the other side.

If comprised in this way, even if it is a big 2nd opening formed over the bottom part and side part of an accommodating part, the one speaker corresponding to the 1st opening part of a 2nd opening part, and a 2nd opening By the other speaker corresponding to the second opening portion of the portion, noise leaking out of the vehicle from the second opening portion can be effectively reduced.

In the vehicle power source noise reduction device according to the above aspect, the speaker is preferably disposed in the vicinity of the opening.

With such a configuration, the canceling sound can be reliably radiated from the speaker arranged in the vicinity of the opening to the outside of the vehicle, so that the noise leaking out of the vehicle can be sufficiently reduced. Further, it is possible to suppress a part of the canceling sound radiated from the speaker from being reflected inside the housing portion without coming out of the vehicle from the opening. As a result, it is possible to suppress the phase of the canceling sound reflected due to reflection in the accommodating portion from changing when it exits from the opening, and therefore it becomes impossible to reduce noise due to the phase change. Can be suppressed. As a result, noise can be reliably reduced.

In the vehicle power source noise reduction device according to the above aspect, any one of the plurality of speakers preferably doubles as a vehicle horn that generates a warning sound.

If comprised in this way, since it is not necessary to provide a horn separately from a vehicle power source noise reduction apparatus, it can suppress that a number of parts increases in the vehicle provided with the vehicle power source noise reduction apparatus. .

In the vehicle power source noise reduction device according to the above aspect, the vehicle power source preferably includes an engine having an engine body, an intake distribution pipe and an exhaust merging pipe connected to the engine body.

In a vehicle equipped with such an engine, even if the noise caused by the engine, the intake distribution pipe and the exhaust merging pipe is radiated from the engine, the speaker is arranged in the direction along the radiation direction of the noise radiated from the engine. In addition, the noise leaking outside the vehicle can be sufficiently reduced by disposing the canceling sound toward the opening communicating with the engine room and the outside of the vehicle.

In the configuration in which the opening includes the first opening and the second opening, preferably, the vehicle power source includes an engine having an engine main body, and an intake manifold pipe and an exhaust merging pipe connected to the engine main body. The first opening is an opening of a front grille of the vehicle, the second opening is an opening for a steering rod or suspension of the vehicle, an opening for an exhaust duct connected to an exhaust merging pipe, And it is at least any one of the opening part for discharge | releasing the air in a accommodating part.

With this configuration, when an opening is formed in a vehicle equipped with an engine to drive the engine and transmit the driving force to the driving mechanism, noise leaking from the opening to the outside of the vehicle is directed toward the opening. Can be sufficiently reduced by a speaker that emits a canceling sound.

In the vehicle power source noise reduction device according to the above aspect, the speaker is preferably disposed in the vicinity of the outer surface of the vehicle power source.

With this configuration, since it is possible to suppress a large phase difference between the noise and the canceling sound, it is possible to reliably suppress the strengthening of the noise and the canceling sound due to the large phase difference. be able to.

In this case, preferably, the sound wave generator that generates the canceling sound of the speaker is disposed within a range of less than a quarter distance of the minimum wavelength corresponding to the maximum frequency of noise from the outer surface of the vehicle power source. .

If configured in this way, it is possible to reliably suppress a large phase difference between the noise and the canceling sound.

1 is a side view schematically showing a vehicle equipped with an engine noise reduction device according to a first embodiment of the present invention. It is the cross-sectional view which showed the inside of the engine room of the engine noise reduction apparatus by 1st Embodiment of this invention. It is the longitudinal section showing the inside of the engine room of the engine noise reduction device by a 1st embodiment of the present invention. It is the longitudinal section showing the inside of the engine room of the engine noise reduction device by a 1st embodiment of the present invention. It is the bottom view seen from the bottom of vehicles carrying the engine noise reduction device by a 1st embodiment of the present invention. 1 is a block diagram of an engine noise reduction device according to a first embodiment of the present invention. It is a typical top view for demonstrating acquisition of the cancellation sound data of the engine noise reduction apparatus by 1st Embodiment of this invention. It is a figure for demonstrating the cancellation sound data memorize | stored in the memory | storage part of the engine noise reduction apparatus by 1st Embodiment of this invention. It is the longitudinal cross-sectional view which showed the inside of the engine room of the engine noise reduction apparatus by 2nd Embodiment of this invention. It is the longitudinal cross-sectional view which showed the inside of the engine room of the engine noise reduction apparatus by 2nd Embodiment of this invention. It is the bottom view seen from the bottom of vehicles carrying the engine noise reduction device by a 2nd embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A vehicle 1 equipped with an engine noise reduction device 100 (an example of a vehicle power source noise reduction device) according to a first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the front of the traveling direction (X-axis direction) of the vehicle 1 is the X1 direction, and the rear is the X2 direction. Further, the upper direction in the direction perpendicular to the ground G (see FIG. 1) (Z-axis direction) is defined as the Z1 direction, and the lower direction (ground G side) is defined as the Z2 direction. Further, one side of the width direction (Y-axis direction) of the vehicle 1 orthogonal to the X-axis direction and the Z-axis direction is defined as the Y1 direction, and the other side is defined as the Y2 direction.

(Vehicle configuration)
A so-called FF drive type vehicle 1 on which the engine noise reduction device 100 according to the first embodiment of the present invention is mounted, as shown in FIG. 1, an engine room 2 in which an engine 10 for driving the vehicle 1 is accommodated ( An example of a housing part) and a vehicle interior 3 provided behind the engine room 2 are provided. The vehicle interior 3 is a vehicle interior space in which a seat 3a is arranged and a driver and a passenger (not shown) get on the vehicle. The engine room 2 and the vehicle interior 3 are partitioned by a dashboard 4. A soundproofing material (not shown) for sound insulation is attached to the dashboard 4 on the engine room 2 side.

The vehicle 1 further includes a steering unit 5 and four wheels 6 for changing the traveling direction of the vehicle 1 when the direction is changed by the steering unit 5. The steering unit 5 includes a steering wheel 5 a operated by a driver, a steering shaft 5 b extending forward and downward from the steering wheel 5 a toward the engine room 2, and a pair of wheels 6 extending in the width direction and in front of the vehicle 1. A steering rod 5c connected to the gearbox 5 and a gear box 5d are included. The gear box 5d connects the steering shaft 5b and the steering rod 5c.

The vehicle 1 further includes a suspension 8 that is disposed between the wheel 6 and the body (frame 7) and that reduces vibration from the ground G transmitted to the body. The suspension 8 includes a coil spring 8a disposed in the vicinity of the wheel 6, and an arm portion 8b (see FIG. 2) extending from the wheel 6 toward the engine room 2 and connected to the coil spring 8a and the frame 7. .

As shown in FIGS. 1 and 2, the engine room 2 includes a bumper 2a disposed in the front (X1 direction), a pair of side panels 2b disposed in both sides (Y1 and Y2 directions), and a rear ( It is formed by being surrounded by the dashboard 4 arranged in the (X2 direction), the bonnet 2c arranged in the upper direction (Z1 direction), and the under covers 2d and 2e arranged in the lower direction. That is, both side portions in the Y-axis direction of the engine room 2 are each constituted by a pair of side panels 2b, and the bottom portion of the engine room 2 is constituted by

undercovers

2d and 2e.

The bumper 2a, the pair of side panels 2b, the dashboard 4, the bonnet 2c, and the under covers 2d and 2e are attached to the frame 7. A front grill 9 is arranged between the bumper 2a and the bonnet 2c.

In the engine room 2, as shown in FIGS. 2 to 5, a four-cylinder in-line engine 10 in which four cylinders are arranged in the width direction (Y-axis direction) (hereinafter abbreviated as the engine 10 is an example of a vehicle power source). ) And a radiator 20 for cooling the engine coolant that is connected to the engine 10 and circulates in the engine 10 is housed. The engine 10 is provided to drive the vehicle 1, and is disposed in the approximate center of the engine room 2. The radiator 20 is disposed in front of the engine 10 and behind the front grill 9. The radiator 20 has a function of cooling the engine coolant with the air taken in from the front grill 9.

Further, an engine room 2 and an opening 2f (an example of a first opening) are formed on the front grille 9 on the opposite side (front) of the vehicle 1 to the inside 3 of the vehicle. Further, between the pair of side panels 2b disposed on both sides (Y1 and Y2 directions) and the bottom (the Z2 direction side portion) and the rear portion (the X2 direction side portion) under cover 2e. Has an opening 2g (an example of a second opening). The opening 2f and the opening 2g communicate the engine room 2 and the outside of the vehicle (the outside of the vehicle 1).

The opening 2 f is formed in a lattice shape at the approximate center in the width direction of the vehicle 1 and the front grille 9. The opening 2f is formed in front of the engine body 11 of the engine 10 (X1 direction). The opening 2 f is provided for taking air into the engine room 2 from the front of the vehicle 1.

The opening 2g includes opening

portions

2h and 2i formed on one side and the other side of the engine room 2 in the Y-axis direction, and the rear and bottom of the engine room 2, respectively. It has the opening

parts

2j and 2k formed over the whole width direction. The opening 2j is formed on the Y1 direction side of the bottom of the engine room 2, and the opening 2k is formed on the Y2 direction side of the bottom of the engine room 2. Further, the opening portions 2h to 2k of the opening 2g communicate with each other.

Also, of the opening 2g, the

openings

2h and 2i are both provided for connecting the steering rod 5c and the wheel 6 and for drawing the arm 8b of the suspension 8 into the engine room 2. Of the opening 2g,

openings

2j and 2k at the bottom of the engine room 2 are provided to guide the exhaust duct 14 from the engine room 2 to the outside of the vehicle. The opening 2g is provided for discharging air taken from the front grill 9 into the engine room 2 to the outside of the vehicle.

The engine 10 is provided with four cylinders 10a, and an engine body 11 in which intake, compression, expansion (combustion), and exhaust processes are continuously performed in the cylinder, and an intake manifold 12 ( And an exhaust manifold 13 (an example of an exhaust merging pipe).

The intake manifold 12 is connected to an intake duct (not shown). The exhaust manifold 13 is connected to the exhaust duct 14. The exhaust duct 14 extends rearward at the bottom of the vehicle 1.

The intake manifold 12 includes a surge tank 12a and four branch pipes 12b branched from the surge tank 12a. Each of the four branch pipes 12b has a function of supplying (distributing) intake air to the corresponding four cylinders 10a. The exhaust manifold 13 includes four branch pipes 13a. Each of the four branch pipes 13 a has a function of collecting exhaust from the corresponding four cylinders 10 a in the exhaust duct 14.

In the engine 10, various sounds are generated as noise. Specifically, a sound caused by explosion sound, intake pulsation, or the like in the engine body 11 in the expansion (combustion) process is generated as noise. The generated noise is radiated from the entire outer surface 10b in a radial direction away from the outer surface 10b of the engine 10, and leaks out of the vehicle mainly from the

openings

2f and 2g of the engine room 2. Note that the frequency and sound pressure of the noise change according to the driving state of the engine 10. The changes in frequency and sound pressure due to noise are mainly caused by the engine speed and the engine load factor.

Here, in the first embodiment, the vehicle 1 is equipped with an engine noise reduction device 100 for reducing the noise of the engine 10. As shown in FIG. 6, the engine noise reduction device 100 includes three (plural) speakers 30 (a front speaker 30a, a rear speaker 30b, and a rear side) that generate a canceling sound having a phase opposite to that of the noise emitted from the engine 10. A speaker 30c) and an output unit 40 for causing the speaker 30 to generate a canceling sound. Note that the three speakers 30 are arranged in the engine room 2 as shown in FIG.

The three speakers 30 have the same structure. Specifically, as shown in FIG. 7, the speaker 30 includes a speaker box 31, a coil 32, a magnet 33, and a diaphragm 34 (an example of a sound wave generator) disposed in the speaker box 31. is doing. In the speaker 30, when a current flows through the coil 32, the magnetic field of the magnet 33 vibrates the coil 32 and the diaphragm 34 connected to the coil 32. This vibration is configured to be radiated from the speaker box 31 as a sound wave. Note that the speaker 30 is a speaker having general directivity, and has a front axis (an axis extending through the center of the diaphragm 34 and extending in a direction orthogonal to the diaphragm 34) of 90 degrees or more and 180 degrees. It has a directivity angle of less than 60 degrees (the angle at which the sound becomes 6 dB smaller than the sound pressure level of the front axis).

Here, in the first embodiment, as shown in FIGS. 2 to 5, the three speakers 30 are each configured to generate a canceling sound in a direction away from the outer surface 10 b of the engine 10. Yes. Further, the three speakers 30 are arranged so as to radiate a canceling sound toward either the

opening

2f or 2g communicating the engine room 2 and the outside of the vehicle. Of the three speakers 30, a front speaker 30a (an example of a first speaker) corresponds to the opening 2f, and a rear speaker 30b (an example of a second speaker and one speaker) and a rear speaker 30c. (An example of the second speaker and the other speaker) corresponds to the opening 2g.

Specifically, the front speaker 30a is disposed in front of the engine 10 (X1 direction) and in the vicinity of the outer surface 10b of the engine 10 as shown in FIGS. Further, the front speaker 30 a is disposed in the vicinity of the opening 2 f formed in front of the engine room 2. The front speaker 30a is configured to generate a cancellation sound forward toward the opening 2f.

2, the rear speaker 30b is disposed on one side in the width direction of the engine 10 (Y1 direction side) and in the vicinity of the outer surface 10b of the engine 10, as shown in FIGS. Further, the rear speaker 30b is disposed in the vicinity of the opening 2g formed behind and below the engine room 2. The rear speaker 30b is configured to generate a cancellation sound in the rear, lower, and Y1 directions toward the opening 2g.

2, the rear speaker 30c is disposed on the other side in the width direction of the engine 10 (Y2 direction side) and in the vicinity of the outer surface 10b of the engine 10, as shown in FIGS. Further, the rear speaker 30c is disposed in the vicinity of the opening 2g. The rear speaker 30c is configured to generate a cancellation sound in the rear, lower, and Y2 directions toward the opening 2g of the engine room 2.

2 and 5, the rear speaker 30b includes an opening portion 2h (an example of a first opening portion) on the Y1 direction side of the opening portion 2g in the side portion, and an opening portion 2g in the bottom portion. A canceling sound is generated toward the opening portion 2j (an example of the first opening portion) on the Y1 direction side. The rear speaker 30c includes an opening portion 2i (an example of a second opening portion) in the Y2 direction side of the opening portion 2g in the side portion, and an opening portion 2k (in the Y2 direction side in the opening portion 2g of the bottom portion). An example of the second opening portion) is configured to generate a canceling sound.

In addition, since the plurality of speakers 30 generate canceling sounds in different directions, it is possible to suppress the canceling sounds from interfering with each other.

Further, as shown in FIG. 7, the diaphragms 34 of the plurality of speakers 30 are each arranged at a distance L from the outer surface 10 b of the engine 10. The distance L satisfies L <λmin / 4, where λmin is the minimum wavelength corresponding to the maximum noise frequency fmax. That is, the diaphragm 34 of the speaker 30 is disposed within a range less than a quarter distance of the minimum wavelength λmin corresponding to the maximum noise frequency fmax from the outer surface 10b of the engine 10 (that is, in the vicinity of the outer surface 10b). ing. Thus, the noise radiation source and the cancellation sound radiation source can be reliably arranged in the vicinity.

As shown in FIG. 6, the output unit 40 includes an ECU (Engine Control Unit) 41 and an amplifier 42 that amplifies the signal. The ECU 41 has a function of controlling the entire engine 10. Further, the ECU 41 is provided with a storage unit 43 including a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 43 includes a plurality of cancel sound data 43a corresponding to the cancel sound generated from the front speaker 30a, a plurality of cancel sound data 43b corresponding to the cancel sound generated from the rear speaker 30b, and the rear speaker 30c. A plurality of cancel sound data 43c corresponding to the cancel sound to be generated is stored.

The cancel sound data 43a to 43c are cancel sound cancel data corresponding to noise at each engine load factor and each engine speed when both the engine load factor and the engine speed of the engine 10 are changed. It is. In the storage unit 43, as shown in FIG. 8, cancel sound data 43a corresponding to an engine load factor greater than 0% and equal to or less than 100% and an engine speed greater than 0 rpm and equal to or less than 6000 rpm (maximum rotation speed). To 43c are stored. For example, the cancel sound data 43a to 43c when the engine load factor is 20% and the engine speed is 4000 rpm, or the cancel sound when the engine load factor is 60% and the engine speed is 5000 rpm. Data 43a to 43c are stored.

Although not described in detail in FIG. 8, in the storage unit 43, the cancel sound data 43a to 43c are stored in increments of 5% for the engine load factor and in increments of 50 rpm for the engine speed. Yes. That is, 2400 (= 20 × 120) pieces of cancel sound data 43a to 43c are stored in the storage unit 43, respectively.

Here, the cancellation sound data 43a to 43c are acquired in advance by the following method. First, as shown in FIG. 7, the engine 10 and the three microphones are arranged in an anechoic chamber that is a space without wall surface echoes. Here, the sound collecting positions of the three microphones are substantially matched with the positions of the diaphragms 34 of the front speaker 30a, the rear speaker 30b, and the rear speaker 30c. And the engine sound (noise) at the time of driving the engine 10 with the engine load factor and engine speed which are measured is acquired with three microphones. Then, by converting the acquired noise data of the noise into an anti-phase waveform, cancel sound data 43a to 43c corresponding to the cancel sound at the engine load factor and the engine speed to be measured are acquired and stored in the storage unit 43. Is done.

Then, the ECU 41 cancels the cancel sound data 43a to 43c corresponding to the current engine speed and the engine load factor from the cancel sound data 43a to 43c (see FIG. 8) stored in the storage unit 43 when the vehicle travels. Is configured to get. Then, as shown in FIG. 6, the ECU 41 transmits the acquired cancel sound data 43a to 43c as signals to the front speaker 30a, the rear speaker 30b, and the rear speaker 30c via the amplifier 42, respectively. It is configured. As a result, cancel sounds corresponding to the current engine speed and engine load factor are output from each of the front speaker 30a, the rear speaker 30b, and the rear speaker 30c.

The storage unit 43 stores horn sound data 43d for generating a warning sound. The ECU 41 is configured to transmit the horn sound data 43d stored in the storage unit 43 as a signal to the front speaker 30a when an instruction to generate a warning sound is issued from the driver. As a result, a warning sound is generated from the front speaker 30a disposed in front of the engine 10. The front speaker 30a also serves as the horn of the vehicle 1 that generates a warning sound. The front speaker 30a is configured to generate a warning sound while generating a canceling sound.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the speaker 30 is arranged in the direction along the radiation direction of the noise radiated from the engine 10 and the opening 2f provided in the engine room 2 in which the engine 10 is housed. It arrange | positions so that a cancellation sound may be radiated | emitted toward 2g. Thereby, since the canceling sound can be radiated out of the vehicle from the

openings

2f and 2g of the engine room 2, noise leaking out of the vehicle can be reduced. Further, the noise that leaks out of the vehicle from the

openings

2f and 2g of the engine room 2 that tends to have a large sound pressure compared to the noise that leaks out of the vehicle from the portions other than the

openings

2f and 2g of the engine room 2 is reduced. And the canceling sound radiated toward 2g can be effectively reduced. As a result, noise leaking out of the vehicle can be sufficiently reduced.

In the first embodiment, the front speaker 30a among the plurality of speakers 30 is associated with the opening 2f among the plurality of openings provided in the engine room 2 and canceled toward the corresponding opening 2f. Arrange to emit sound. Further, the rear speaker 30b and the rear speaker 30c among the plurality of speakers 30 are associated with the opening 2g among the plurality of openings provided in the engine room 2 and canceled toward the corresponding opening 2g. Arrange to emit sound. As a result, noise leaking out of the vehicle from each of the plurality of

openings

2f and 2g can be effectively reduced by the canceling sound radiated from the corresponding speaker 30, so that the noise leaking out of the vehicle can be sufficiently and reliably detected. Can be reduced.

Further, in the first embodiment, the front speaker 30a is disposed so as to radiate a canceling sound toward the opening 2f formed on the opposite side (front) of the vehicle 1 of the vehicle 1 in the engine room 2. Further, the rear speaker 30b and the rear speaker 30c are arranged so as to radiate a canceling sound toward the opening 2g formed at the bottom of the engine room 2. As a result, noise that leaks out of the vehicle from the opening 2f formed on the side opposite to the interior 3 of the vehicle 1 in the engine room 2 and the opening 2g formed on the bottom of the engine room 2 respectively corresponds. The canceling sound emitted from the front speaker 30a, the rear speaker 30b, and the rear speaker 30c can be effectively reduced.

In the first embodiment, the opening 2g is formed across the bottom and both sides of the engine room 2. Then, the rear speaker 30b is disposed so as to radiate a canceling sound toward the opening

portions

2h and 2j formed over the one side portion of the side portion and the bottom portion of the one side portion of the opening portion 2g. . Further, the rear speaker 30c is arranged so as to radiate a canceling sound toward the opening

portions

2i and 2k formed over the other side portion of the side portion and the bottom portion on the other side portion of the opening portion 2g. . As a result, even with the large opening 2g formed across the bottom and side of the engine room 2, the rear speaker 30b corresponding to the opening

portions

2h and 2j of the opening 2g and the opening of the opening 2g By the rear speaker 30c corresponding to the

portions

2i and 2k, noise leaking out of the vehicle from the opening 2g can be effectively reduced.

In the first embodiment, the front speaker 30a is disposed in the vicinity of the opening 2f, and the

rear speakers

30b and 30c are both disposed in the vicinity of the opening 2g. As a result, the canceling sound can be reliably radiated outside the vehicle from the speaker 30 disposed in the vicinity of the

opening

2f or 2g, so that the noise leaking outside the vehicle can be sufficiently reduced. Further, it is possible to suppress a part of the canceling sound radiated from the speaker 30 from being reflected in the engine room 2 without coming out of the vehicle from the

openings

2f and 2g. As a result, it is possible to suppress the phase of the canceling sound reflected due to reflection in the accommodating portion from changing when it exits from the

openings

2f and 2g, so that noise can be reduced due to the phase change. It is possible to suppress the inability to perform. As a result, noise can be reliably reduced.

In the first embodiment, the front speaker 30a among the plurality of speakers 30 also serves as the horn of the vehicle 1 that generates a warning sound. Thereby, since it is not necessary to provide a horn separately from the engine noise reduction device 100, it is possible to suppress an increase in the number of parts in the vehicle 1 provided with the engine noise reduction device 100.

In the first embodiment, the engine 10 includes an engine main body 11, an intake manifold 12 and an exhaust manifold 13 connected to the engine main body 11. When such a sound caused by the vertical movement of the piston in the engine body 11 or a sound caused by the intake pulsation or the like in the intake manifold 12 is emitted from the engine 10 as noise, the speaker 30 is emitted from the engine 10. The canceling sound is radiated in the direction along the radiation direction of the noise and toward the

openings

2f and 2g communicating the engine room 2 and the outside of the vehicle. Thereby, the noise leaking out of the vehicle can be sufficiently reduced.

In the first embodiment, the opening 2 f formed on the opposite side (front) of the engine room 2 to the vehicle interior 3 of the vehicle 1 takes air from the front of the vehicle 1 of the front grill 9 into the engine room 2. Is the opening. An opening 2g formed at the bottom of the engine room 2 includes an opening for the steering rod 5c and the suspension 8 of the vehicle 1, an opening for the exhaust duct 14 connected to the exhaust manifold 13, and an engine. It is an opening for releasing air in the room 2. Thus, when the

openings

2f and 2g are formed to drive the engine 10 and transmit the driving force to the wheels 6 in the vehicle 1 including the engine 10, noise leaking from the

openings

2f and 2g to the outside of the vehicle. It can be sufficiently reduced by the speaker 30 that emits a canceling sound toward the

openings

2f and 2g.

In the first embodiment, the speaker 30 is disposed in the vicinity of the outer surface 10b of the engine 10. As a result, it is possible to suppress the occurrence of a large phase difference between the noise and the canceling sound, and thus it is possible to reliably suppress the strengthening of the noise and the canceling sound due to the large phase difference. is there.

Also, in the first embodiment, the diaphragm 34 of the speaker 30 is disposed within a range less than ¼ distance of the minimum wavelength λmin corresponding to the maximum noise frequency fmax from the outer surface 10b of the engine 10. Thereby, it is possible to reliably suppress a large phase difference between the noise and the canceling sound.

(Second Embodiment)
Next, the configuration of the vehicle 201 on which the engine noise reduction device 200 (an example of a vehicle power source noise reduction device) according to the second embodiment of the present invention is mounted will be described with reference to FIGS. In the second embodiment, unlike the first embodiment, an example in which an engine room 202 (an example of a housing portion) is formed behind the vehicle interior 3 (X2 direction) will be described. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

A so-called RR drive type vehicle 201 according to the second embodiment of the present invention includes an engine room 202 (an example of a storage unit) in which an engine 210 for driving the vehicle 201 is stored, as shown in FIGS. I have. The engine room 202 is formed behind the vehicle interior 3 (X2 direction). In addition, an opening 202f is formed in the rear portion (portion on the X2 direction side) of the engine room 202. The opening 202f is formed in a lattice shape at substantially the center in the width direction of the vehicle 201.

Further, as shown in FIG. 11, an opening 202l is formed in the side and bottom (X2 direction) of the engine room 202 on the Y1 direction, and the side and bottom of the engine room 202 on the Y2 direction. An opening 202m is formed in the opening. These

openings

202f, 202l, and 202m communicate between the engine room 202 and the outside of the vehicle.

Here, in the second embodiment, as shown in FIGS. 9 to 11, the vehicle 201 is equipped with an engine noise reduction device 200 for reducing the noise of the engine 210. The engine noise reduction device 200 includes three (plural) speakers 230 (a rear speaker 230a, a front speaker 230b, and a front speaker 230c) that generate a canceling sound having a phase opposite to that of noise radiated from the engine 210. Note that the three speakers 230 are arranged in the engine room 202.

Each of the three speakers 230 is configured to generate a canceling sound in a direction away from the outer surface 210b of the engine 210. Further, the three speakers 230 are arranged so as to emit a canceling sound toward the

openings

202f, 202l, and 202m that communicate the engine room 202 with the outside of the vehicle. Of the three speakers 230, the rear speaker 230a corresponds to the opening 202f, the front speaker 230b corresponds to the opening 202l, and the front speaker 230c corresponds to the opening 202m.

Specifically, the rear speaker 230a is arranged behind the engine 210 (X2 direction) and in the vicinity of the outer surface 210b of the engine 210. Further, the rear speaker 230 a is disposed in the vicinity of the opening 202 f formed at the rear of the engine room 202. The rear speaker 230a is configured to generate a cancellation sound forward toward the opening 202f.

The front speaker 230 b is disposed on one side in the width direction of the engine 210 (Y1 direction side) and in the vicinity of the outer surface 210 b of the engine 210. Further, the front speaker 230b is disposed in the vicinity of the opening 202l formed in front of and below the engine room 202. The front speaker 230b is configured to generate a canceling sound downward and in the Y1 direction toward the opening 202l.

The front speaker 230c is arranged on the other side (Y2 direction side) in the width direction of the engine 210 and in the vicinity of the outer surface 210b of the engine 210. Further, the front speaker 230c is disposed in the vicinity of the opening 202m formed in front of and below the engine room 202. The front speaker 230c is configured to generate a canceling sound downward and in the Y2 direction toward the opening 202m of the engine room 202. Other configurations of the second embodiment are the same as those of the first embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the canceling sound is emitted from the speaker 230 in the direction along the radiation direction of the noise radiated from the engine 210 and toward the openings 202f and 202g provided in the engine room 202. To radiate. Thereby, the noise which leaks out of a vehicle can be fully reduced like 1st Embodiment.

In the second embodiment, the rear speaker 230a, the front speaker 230b, and the front speaker 230c are arranged so as to radiate a cancellation sound toward the

openings

202f, 202l, and 202m of the engine room 202, respectively. Thereby, the noise leaking out of the vehicle through the opening 202f of the engine room 202 can be effectively reduced by the canceling sound from the rear speaker 230a radiated toward the opening 202f. Further, the noise leaking out of the vehicle from the openings 202l and 202m of the engine room 202 is more effective due to the canceling sound from the front speaker 230b and the canceling sound from the front speaker 230c radiated toward the openings 202l and 202m, respectively. Can be reduced. Therefore, noise leaking out of the vehicle can be sufficiently reduced. The remaining effects of the second embodiment are similar to those of the first embodiment.

[Modification]
It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the description of the above-described embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

For example, in the first and second embodiments, an example in which the noise of the in-line four-cylinder engine 10 (210, vehicle power source) is reduced by the engine noise reduction device 100 (200, vehicle power source noise reduction device) is shown. However, the present invention is not limited to this. In the present invention, the vehicle power source noise reduction device may be used to reduce noise of a multi-cylinder engine other than the in-line four-cylinder engine, a V-type multi-cylinder engine, or the like. Further, the vehicle power source noise reduction device may be used to reduce the noise of an engine mounted on, for example, equipment other than that for automobiles that needs to reduce noise. The vehicle power source is not limited to the engine, and may be a motor, for example. Furthermore, the number of vehicle power sources is not limited to one, and a vehicle power source noise reduction device may be used so as to reduce the noise of two or more vehicle power sources. For example, in a vehicle equipped with both an engine and a motor, a vehicle power source noise reduction device may be used so as to reduce the noise of both the engine and the motor.

In addition to the configuration of the first or second embodiment, the vehicle power source noise reduction device may further include a sound collector that collects noise radiated from the vehicle power source. The vehicle power source noise reduction device corrects the deviation when the deviation amount between the noise collected by the sound collector and the reference noise (for example, initial vehicle power source noise) exceeds a deviation threshold. You may comprise as follows. In this case, it is preferable that the microphone can preferentially collect noise from the vehicle power source.

Further, different speakers having different directivities or different frequency characteristics may be used as the three speakers 30 (230) in the first or second embodiment.

In the first embodiment, the storage unit 43 stores cancel sound data 43a to 43 corresponding to engine load factors greater than 0% and less than or equal to 100% and engine speeds greater than 0 rpm and less than or equal to 6000 rpm (maximum rotation speed). Although an example is shown in which 43c is stored, the present invention is not limited to this. In the present invention, the value of the maximum rotational speed may be changed depending on the performance of the vehicle power source. Further, the cancel sound data may be stored in accordance with parameters other than the load factor and the rotational speed (for example, throttle opening degree, etc.).

In the first embodiment, the cancel sound data 43a to 43c are stored in the storage unit 43 in units of 5% for the engine load factor and in units of 50 rpm for the engine speed, respectively. The present invention is not limited to this. In the present invention, the number of cancel sound data may be changed as appropriate according to the desired degree of noise reduction.

In the first and second embodiments, the three speakers 30 (230) are arranged in the vicinity of the outer surface 10b (210b) of the engine 10 (210) in the engine room 2 (202, accommodating portion). However, the present invention is not limited to this. In the present invention, the speaker only needs to be disposed in the housing portion, and the speaker may be disposed at a position away from the outer surface of the engine.

In the first and second embodiments, the example using the three speakers 30 (230) is shown, but the present invention is not limited to this. In the present invention, the number of speakers may be one, two, or four or more.

In the first embodiment, the example is shown in which the front speaker 30a is associated with the opening 2f and the

rear speakers

30b and 30c are associated with the opening 2g. In the second embodiment, the rear speaker 230a is associated with the opening 202f, the front speaker 230b is associated with the opening 202l, and the front speaker 230b is associated with the opening 202m. The invention is not limited to this. In the present invention, one speaker may correspond to a plurality of openings by configuring one speaker to emit a canceling sound toward the plurality of openings.

In the first embodiment, an example in which two speakers (rear speaker 30b and rear speaker 30c) are used for one large opening 2g has been described. However, the present invention is not limited to this. I can't. In the present invention, one or three or more speakers may be used for a large opening. Note that the number of speakers can be reduced by using a speaker having a wide directivity (a large directivity angle) for a large opening.

In the first and second embodiments, an example in which a directional speaker is used as the plurality of speakers 30 (230) is shown, but the present invention is not limited to this. In the present invention, the speaker may be an omnidirectional speaker as long as the canceling sound can be emitted toward the opening. Note that it is preferable to use a speaker having directivity in order to prevent the canceling sound from moving to other than the opening.

In the first embodiment, the so-called FF drive type vehicle 1 is shown, and in the second embodiment, the so-called RR drive type vehicle 201 is shown, but the present invention is not limited to this. For example, the vehicle may be a so-called FR drive system. In this case, the speaker of the vehicle power source noise reduction device is arranged together with the vehicle power source in a housing portion formed in front of the vehicle interior, as in the first embodiment. Further, for example, the vehicle may be a so-called MR drive system. In this case, the speaker of the vehicle power source noise reduction device is disposed together with the vehicle power source in a housing portion formed at the rear of the vehicle interior, as in the second embodiment.

Moreover, in the said 1st Embodiment, as the opening part which connects the engine room 2 and the vehicle exterior which the speaker 30 radiates | emits cancellation sound, in the opening part 2f formed in the front, a side, back, and the downward direction An opening 2g formed over the surface is shown as an example. Further, in the second embodiment, as the opening from which the speaker 230 emits the canceling sound, the opening 202f formed at the rear and the openings 202l and 202m formed across the side and the lower side are exemplified. However, the present invention is not limited to this. In the present invention, the opening where the speaker emits the canceling sound is not particularly limited as long as the opening is an opening that communicates the housing portion with the outside of the vehicle. For example, if there is an opening between the side panel and the bonnet that communicates the housing and the outside of the vehicle, the vehicle emits a canceling sound toward the opening between the side panel and the bonnet. A power source noise reduction device may be configured.

Further, in addition to the configuration of the first or second embodiment, a speaker that does not emit cancellation sound toward the opening may be newly provided. In this case, in order to reliably reduce the noise radiated from the vehicle power source by the canceling sound, it is preferable that the newly provided speaker is provided in the vicinity of the outer surface of the vehicle power source.

1,201 Vehicle 2,202 Engine room (container)
2f, 202f opening (first opening)
2g, 202l, 202m opening (second opening)
2h, 2j opening part (first opening part)
2i, 2k opening (second opening)
5c Steering rod 8 Suspension 9 Front grille 10 Engine (vehicle power source)
10a engine body 10b outer surface 12 intake manifold (intake merging pipe)
13 Exhaust manifold (exhaust merging pipe)
14

Exhaust duct

30, 230 Speaker 30a Front speaker (first speaker)
30b Rear speaker (second speaker, one speaker)
30c Rear speaker (second speaker, other speaker)
34 Diaphragm (Sound wave generator)
100, 200 Engine noise reduction device (vehicle power source noise reduction device)
230a Rear speaker (first speaker)
230b, 230c Front speaker (second speaker)

Claims

A speaker that is disposed in a housing portion in which a vehicle power source for driving the vehicle is housed, reduces noise emitted from the vehicle power source, and generates a cancellation sound having a phase opposite to that of the noise;
The speaker is arranged to radiate the canceling sound in a direction along a radiation direction of the noise radiated from the vehicle power source and toward an opening communicating the housing portion with the outside of the vehicle. Vehicle power source noise reduction device.
A plurality of the speakers are provided,
Each of the plurality of speakers is associated with each of the plurality of openings provided in the accommodating portion, and is arranged to radiate the canceling sound toward the corresponding opening. The vehicle power source noise reduction device according to claim 1.
The opening of the housing includes a first opening formed on the side of the housing opposite to the interior of the vehicle, and a second opening formed at least on the bottom of the housing,
The plurality of speakers are arranged to radiate the cancellation sound toward the first opening and the first speaker arranged to radiate the cancellation sound toward the first opening. The vehicle power source noise reduction device according to claim 2, comprising two speakers.
The second opening is formed across the bottom and side of the housing part,
The second speaker radiates the canceling sound toward a first opening portion formed over one side portion of the side portion and the bottom portion on the one side portion side of the second opening portion. The cancellation sound is radiated toward the second opening portion formed over the one side speaker arranged on the side and the second side portion of the second opening portion and the bottom portion on the other side portion side. The vehicle power source noise reduction device according to claim 3, further comprising: the other speaker arranged to perform.
The vehicle power source noise reduction device according to any one of claims 1 to 4, wherein the speaker is disposed in the vicinity of the opening.
The vehicle power source noise reduction device according to any one of claims 1 to 5, wherein the speaker also serves as a horn of the vehicle that generates a warning sound.
The vehicle power source noise reduction device according to any one of claims 1 to 6, wherein the vehicle power source includes an engine having an engine body and an intake pipe and an exhaust junction pipe connected to the engine body. .
The vehicle power source includes an engine having an engine body, and an intake pipe and an exhaust merging pipe connected to the engine body,
The first opening is an opening of a front grill of the vehicle, and the second opening is an opening for a steering rod or suspension of the vehicle and an exhaust duct connected to the exhaust merging pipe. 5. The vehicle power source noise reduction device according to claim 3, wherein the vehicle power source noise reduction device is at least one of an opening for discharging air in the housing portion.
The vehicle power source noise reduction device according to any one of claims 1 to 8, wherein the speaker is disposed in the vicinity of an outer surface of the vehicle power source.
The sound wave generator for generating the canceling sound of the speaker is disposed within a range of less than 1/4 distance of the minimum wavelength corresponding to the maximum frequency of the noise from the outer surface of the vehicle power source. The vehicle power source noise reduction device according to claim 9.