EP1865187B1 - Verbesserungen bei oder im Zusammenhang mit Fahrzeuggeräuschen - Google Patents

Verbesserungen bei oder im Zusammenhang mit Fahrzeuggeräuschen Download PDF

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Publication number
EP1865187B1
EP1865187B1 EP07109532A EP07109532A EP1865187B1 EP 1865187 B1 EP1865187 B1 EP 1865187B1 EP 07109532 A EP07109532 A EP 07109532A EP 07109532 A EP07109532 A EP 07109532A EP 1865187 B1 EP1865187 B1 EP 1865187B1
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EP
European Patent Office
Prior art keywords
composite membrane
frequency
intake
elastic
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP07109532A
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English (en)
French (fr)
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EP1865187A2 (de
EP1865187A3 (de
Inventor
Shinichi Takeuchi
Hiroshi Shimada
Takeharu Sasaoka
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Publication date
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Publication of EP1865187A2 publication Critical patent/EP1865187A2/de
Publication of EP1865187A3 publication Critical patent/EP1865187A3/de
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Publication of EP1865187B1 publication Critical patent/EP1865187B1/de
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10295—Damping means, e.g. tranquillising chamber to dampen air oscillations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10301—Flexible, resilient, pivotally or movable parts; Membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/112—Intake manifolds for engines with cylinders all in one line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1294—Amplifying, modulating, tuning or transmitting sound, e.g. directing sound to the passenger cabin; Sound modulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/161—Arrangement of the air intake system in the engine compartment, e.g. with respect to the bonnet or the vehicle front face

Definitions

  • the present invention is concerned generally with improvements in or relating to vehicle noise.
  • Embodiments of the invention relate particularly, but not exclusively, to a type of device for improving the sound quality of a suction noise generated by an intake system of an automobile or the like.
  • aspects of the invention relate to an apparatus, to an engine and to a vehicle.
  • European patent application EP 1 111 228 A2 describes a suction filter having a sound absorbing membrane located in a casing for absorbing the suction noise of a vehicle.
  • the membrane comprises several zones having different masses and/or rigidity in order to absorb sound at several frequencies. Mass and/or rigidity differences between the membrane zones are obtained by having different thicknesses or by having different mass elements made of plastic material applied on the membrane zones.
  • PCT patent application W02005/045225 describes air intake sound tuning, and in particular a resonator connected to the air intake of a vehicle in order to compensate sound decrease at certain speed range.
  • the resonator comprises a main body section that can be either a pipe or a chamber and includes a resonating body made of rubber.
  • W02005/045225 describes suitably setting the dimensions of the main body section to tune the frequency range and magnitude of sound pressure released to the outside.
  • Japanese Patent No. 3613665 describes a known device that boosts suction noise.
  • the device described therein is for amplifying suction noise and has plural intake ducts having resonance frequencies that are different from each other, so that it is possible to boost the suction noise at different frequencies, and permits introduction of suction noise into the vehicle passenger compartment.
  • the device for amplifying suction noise described in Japanese Patent No. 3613665 has some disadvantages.
  • the device is constituted with plural intake ducts, there is no leeway in the space required inside the engine compartment. Thus, there are restrictions on the layout, and the device is difficult to install in the engine compartment.
  • Embodiments of the invention may boost the suction noise of a vehicle thanks to the fact that resonance of an elastic membrane, due to variation in pressure of air transmitted into an engine intake port, is allowed to occur at least two different frequencies.
  • an apparatus for amplifying the suction noise of a vehicle comprising an intake duct for feeding air to an engine intake port, a connecting pipe connected to an interior of the intake duct, a composite membrane positioned within the connecting pipe, wherein the composite membrane is arranged to block an interior passage formed in the connecting pipe, characterized in that the composite membrane includes at least two elastic membranes with at least one of masses and rigidities that differ from each other, and in that the composite membrane further comprises a rigidity changing portion formed between the at least two elastic membranes, with the rigidity of the rigidity changing portion being different from that of the at least two elastic membranes.
  • the at least two elastic membranes have different areas from each other.
  • At least two elastic membranes are made of materials having one of different moduli and densities from each other.
  • the at least two elastic membranes have different thicknesses from each other.
  • the rigidity changing portion is one of a convex portion and concave portion formed on a surface of the composite membrane.
  • the rigidity changing portion further comprises a core member with a rigidity higher than that of the elastic membranes.
  • the rigidity changing portion further comprises at least an annular rigidity changing portion of one of a generally circular or elliptical shape and arranged inward of an outer periphery of the composite membrane and radial rigidity changing portions that extend from the annular rigidity changing portion to the outer periphery of the composite membrane, and which divide the region between the portion surrounded by the annular rigidity changing portion and the outer periphery of the composite membrane into at least two portions.
  • a device for amplifying the suction noise of a vehicle may comprise an intake duct, a connecting pipe and a composite membrane.
  • the intake duct is for feeding air to an engine intake port.
  • a connecting pipe is connected to an interior of the intake duct.
  • the composite membrane is positioned within the connecting pipe.
  • the composite member blocks an interior passage formed in the connecting pipe.
  • the composite member further includes at least two elastic membranes with one of masses and rigidities that different from each other.
  • an engine or a vehicle having an apparatus as defined above.
  • Figures 1A-1C includes diagrams illustrating a vehicle C carrying a device 1 for amplifying suction noise according to a first embodiment.
  • Figure 1A is a side view of a vehicle C.
  • Figure 1B is a top view of vehicle C.
  • Figure 1C is a front view of vehicle C.
  • device 1 that boosts suction noise in the first embodiment is arranged in front of a vehicle passenger compartment 2. Indeed, device 1 is arranged in an engine compartment 6 that is separated from vehicle passenger compartment 2 by a dash panel 4. Further, device 1 is arranged on an intake duct 10 that is connected to an engine 8.
  • the resonant vibration of air in intake duct 10 takes place in air intake duct 10.
  • pressure variations develop in air in intake duct 10, and these pressure variations in the air are perceived by humans as noise.
  • the noise accompanying intake is called suction noise.
  • the frequency of the suction noise depends on the frequency of the pressure variations generated due to the resonance phenomenon.
  • the frequency of the pressure variation that takes place due to the resonance phenomenon is determined by the resonance frequency, which depends on the length of the intake duct, etc.
  • FIG 2 is a diagram illustrating the structure of device 1 that amplifies the suction noise in the first embodiment.
  • device 1 that amplifies the suction noise in the first embodiment comprises a connecting pipe 12, an additional pipe 14, and a composite membrane 16 (represented by dashed lines in Figure 2 ).
  • connecting pipe 12 is generally cylindrical, and is attached to an outer peripheral surface of intake duct 10, which may be formed of a draft tube with air inside it. Connecting pipe 12 communicates with intake duct 10.
  • additional pipe 14 may also be generally cylindrical. A first opening at one end of additional pipe 14 is connected to connecting pipe 12, and a second opening at the other end of additional pipe 14 opens to external air.
  • Composite membrane 16 is generally disk-shaped and may be made of, for example, rubber or another elastic material.
  • Composite member 16 is attached on an inner peripheral surface of connecting pipe 12 and extends across an interior of connecting pipe 12 so as to close connecting pipe 12.
  • Composite membrane 16 undergoes elastic deformation during intake by engine 8, corresponding to variation in an intake vacuum generated in air inside intake duct 10, so that vibration of composite membrane 16 occurs in an out-of-plane direction. The detailed structure of composite membrane 16 will be explained later.
  • Intake duct 10 forms an intake path from the external air to engine 8, and is comprised of a dust side intake duct 20 and a clean side intake duct 18.
  • a first opening at one end of dust side intake duct 20 is connected to an air cleaner 22, and a second opening at the other end of dust side intake duct 20 opens to the external air.
  • Clean side intake duct 18 includes a throttle chamber 24. A first opening at one end of clean side intake duct 18 is connected to air cleaner 22, and a second opening at the other end of clean side intake duct 18 is connected via a surge tank 26 to various portions of an intake manifold 28 to the various cylinders (not shown in the figure) of engine 8.
  • air cleaner 22 includes an oiled filter or other filter part for cleaning air flowing from the second opening at one end of dust side intake duct 10 as it passes through the filter portion.
  • Throttle chamber 24 is installed between air cleaner 22 and surge tank 26, and is connected to an accelerator pedal (not shown in the figure). Throttle chamber 24 adjusts the airflow rate from air cleaner 22 to surge tank 26 corresponding to the amount of accelerator pedal depression. When the amount of accelerator pedal depression is reduced, the airflow rate from air cleaner 22 to surge tank 26 is decreased, so that the rotational velocity of engine 8 falls, and at the same time the intake vacuum generated in the air inside intake duct 10 is reduced. On the other hand, when the amount of accelerator pedal depression is increased, the airflow rate from air cleaner 22 to surge tank 26 is increased, so that the rotational velocity of engine 8 rises, and at the same time, the intake vacuum generated in the air in intake duct 10 is increased.
  • engine 8 draws air that has flowed from the opening at the second end of dust side intake duct 20 and is present inside clean side intake duct 18 into the various cylinders via surge tank 26 and intake manifold 28.
  • engine 8 becomes a pressure source that generates intake pulsation in the air inside intake duct 10, and this intake pulsation results in suction noise.
  • the intake pulsation that occurs in conjunction with the intake operation of engine 8 is a pressure variation generated in the air inside intake duct 10.
  • This pressure variation is composed of plural pressure variations at different frequencies. That is, the intake pulsation that occurs in conjunction with the intake operation of engine 8 is composed of plural intake pulsations at different frequencies.
  • engine 8 is assumed to be a 6-cylinder in-line engine. However, engine 8 is not limited to this construction.
  • Figure 3 is a diagram illustrating the detailed structure of composite membrane 16.
  • composite membrane 16 includes three elastic membranes 30a-30c. Elastic membranes 30a-30c are separated from each other by slots 32 formed in the surface on an intake duct side of composite membrane 16. In the embodiment shown, and slots 32 are formed in shapes having different areas. More specifically, area Sa of elastic membrane 30a is larger than area Sb of elastic membrane 30b, and area Sb of said elastic membrane 30b is larger than area Sc of elastic membrane 30c. That is, elastic membranes 30a-30c are formed to satisfy the relationship Sa > Sb > Sc.
  • the resonance frequency is that for vibration at a prescribed frequency detected when an object is allowed to vibration freely. Any object has a natural resonance frequency. Usually, an object has plural resonance frequencies.
  • the resonance frequency depends on the rigidity and mass of the object. More specifically, the higher the rigidity, the higher the resonance frequency, while the larger the mass, the lower the resonance frequency.
  • rigidity refers to the proportionality coefficient between a bending or twisting force applied to the structural body and the deflection of the structural body as a whole.
  • elastic membranes 30a-30c have different areas, they differ from each other in rigidity and mass. As a result, they have different resonance frequencies.
  • elastic membrane 30a with a larger area has a lower resonance frequency for vibration in the out-of-plane direction. Consequently, for said elastic membranes 30a-30c, assuming the resonance frequency of elastic membrane 30a to be first resonance frequency f1, the resonance frequency of elastic membrane 30b to be second resonance frequency f2, and the resonance frequency of elastic membrane 30c to be third resonance frequency f3, the following conditional relationship among them applies: f1 ⁇ f2 ⁇ f3.
  • elastic membranes 30a-30c are appropriately formed such that their resonance frequencies correspond to intake pulsation at a first frequency, intake pulsation at a second frequency and intake pulsation at a third frequency selected from among the intake pulsations at plural frequencies that form the intake pulsation generated in conjunction with the intake operation of engine 8. More specifically, first resonance frequency f1 of elastic membrane 30a matches the first intake pulsation frequency, second resonance frequency f2 of elastic membrane 30b matches the second intake pulsation frequency, and third resonance frequency f3 of elastic membrane 30c matches the third intake pulsation frequency.
  • the first frequency is lower than the second frequency and the second frequency is lower than the third frequency. That is, the first frequency, second frequency and third frequency satisfy the following relationship: first frequency ⁇ second frequency ⁇ third frequency.
  • the first frequency is the frequency of the intake pulsation generated when the engine rotates at a prescribed rotational velocity R1
  • the second frequency is the frequency of the intake pulsation generated at a prescribed rotational velocity R2
  • the third frequency is the frequency of the intake pulsation generated at a prescribed rotational velocity R3.
  • R1 is a rotational velocity lower than R2 and R2 is a rotational velocity lower than R3. That is, rotational velocities R1, R2, R3 satisfy the following relationship: R1 ⁇ R2 ⁇ R3.
  • each of slots 32 is formed between two adjacent elastic membranes, and they form rigidity changing portions having different rigidities from those of elastic membranes 30a-30c.
  • acceleration mode While engine 8 is running, as the amount of accelerator pedal depression is increased, the airflow rate from air cleaner 22 to surge tank 26 is increased (hereinafter to be referred to as acceleration mode). As a result, while the rotational velocity of engine 8 is increased, the intake vacuum generated for the air in intake duct 10 rises (see Figure 2 ).
  • Figures 4-6 are diagrams illustrating the vibration of elastic membranes 30a-30c in the out-of-plane direction of the composite membrane 16 during the acceleration mode.
  • Figure 4 is a diagram illustrating the state when the rotational velocity of the engine is R1;
  • Figure 5 is a diagram illustrating the state when the rotational velocity of the engine is R2;
  • Figure 6 is a diagram illustrating the state when the rotational velocity of the engine is R3.
  • an intake pulsation at the first frequency is propagated via connecting pipe 12 to composite membrane 16.
  • the intake pulsation at the second frequency is propagated via connecting pipe 12 to composite membrane 16.
  • the intake pulsation at the third frequency is propagated via connecting pipe 12 to composite membrane 16.
  • three elastic membranes 30a-30c are formed to have different resonance frequencies for vibration in the out-of-plane direction of composite membrane 16.
  • the present embodiment is not limited to this scheme. Indeed, a scheme may also be adopted in which among three elastic membranes 30a-30c, at least two elastic membranes have resonance frequencies for vibration in the out-of-plane direction of the composite membrane that are different from each other.
  • three elastic membranes 30a-30c are formed to have different resonance frequencies for vibration in the out-of-plane direction of composite membrane 16 by virtue of having different areas.
  • the present embodiment is not limited to this scheme, however. That is, a scheme may also be adopted in which three elastic membranes 30a-30c are formed with the same area, and at the same time, they are formed different from each other with respect to rigidity and/or mass, so that the resonance frequencies for vibration in the out-of-plane direction of the composite membrane are different from each other.
  • an elastic membrane 30 having increased rigidity and/or mass a core member may be arranged inside it, or a processed mass body for forming ribs on elastic membrane 30 may be attached, or the thickness of elastic membrane 30 may be increased.
  • elastic membrane 30 has the same area as the other elastic membranes, elastic membrane 30 nevertheless has higher rigidity and/or larger mass than the others.
  • device 1 that amplifies the suction noise has a composite membrane 16 composed of three elastic membranes 30a-30c.
  • the present embodiment is not limited to this scheme, however.
  • a scheme can also be adopted in which composite membrane 16 is composed of two elastic membranes 30 or more than three elastic membranes 30.
  • device 1 that amplifies the suction noise is set in engine compartment 6 in front of vehicle passenger compartment 2.
  • other locations for device 1 that amplifies the suction noise are contemplated. That is, for example, when vehicle C has an engine compartment 6 arranged behind vehicle passenger compartment 2, the location for device 1 that amplifies the suction noise can be in engine compartment 6 located behind vehicle passenger compartment 2. Also, for example, when vehicle C has an engine compartment 6 beneath vehicle passenger compartment 2, the location for device 1 that amplifies the suction noise can be within engine compartment 6 set beneath vehicle passenger compartment 2. In any case, the location of device 1 that amplifies the suction noise can be adjusted appropriately according to the configuration of vehicle C, that is, the position of engine compartment 6.
  • the composite membrane 16 is composed of three elastic membranes 30a, 30b, 30c.
  • Elastic membranes 30a, 30b, 30c have resonance frequencies for vibrations in the out-of-plane direction of composite membrane 16 that differ from each other.
  • the various elastic membranes 30a, 30b, 30c vibrate in the out-of-plane direction of composite membrane 16 corresponding to variation in the rotational velocity of the engine.
  • the intake pulsation at the first frequency, and the suction noises at the second frequency and third frequency are amplified corresponding to variation in the rotational velocity of the engine, and the amplified suction noise is emitted from the second opening of additional pipe 14 on the external air side.
  • the emitted suction noise is propagated via the air into the vehicle passenger compartment, so that an impressive suction noise is transmitted into vehicle passenger compartment 2.
  • composite membrane 16 is comprised of three elastic membranes, and these elastic membranes are formed with different areas, so that they have different vibration frequencies in the out-of-plane direction of composite membrane 16.
  • Figure 7 is a diagram illustrating the structure of composite membrane 16 for device 1 for amplifying the suction noise of a vehicle.
  • the structure of device 1 for amplifying the suction noise of a vehicle C in the second embodiment is the same as that of the first embodiment, except for the structure of composite membrane 16. That is, composite membrane 16 in the second embodiment is divided by rigidity changing portions 34 formed between every pair of adjacent elastic membranes and having rigidities different from those of said elastic membranes 30a-30d. Viewed in the thickness direction, composite membrane 16 has four elastic membranes 30a-30d.
  • Rigidity changing portions 34 include an annular rigidity changing portion 36 and radial rigidity changing portions 38a-38c.
  • Annular rigidity changing portion 36 is formed as a slot arranged in the surface of composite membrane 16 on an intake duct side of composite membrane 16. Annular rigidity changing portion 36 is shaped to surround a portion of composite membrane 16 that includes the center of composite membrane 16, and it has an overall circular or elliptical shape. In the second embodiment, the center portion surrounded with annular rigidity changing portion 36 is referred to as elastic membrane 30d in the following description.
  • radial rigidity changing portions 38a-38c are formed as slots in the surface of composite membrane 16 on the intake duct side of composite member 16, and annular rigidity changing portions 38a-38d extend from annular rigidity changing portion 36 towards an outer periphery of composite membrane 16, so that they divide the portions other than that surrounded by annular rigidity changing portion 36 into plural portions.
  • annular rigidity changing portions 38a-38c in the second embodiment an example is explained in which three radial rigidity changing portions 38a-38c are formed extending from annular rigidity changing portion 36 towards the outer periphery of composite membrane 16.
  • the three elastic membranes 30 divided by said three radial rigidity changing portions 38a-38c are described as elastic membranes 30a-30c, respectively.
  • Elastic membranes 30a-30d are formed into shapes with different areas by means of rigidity changing portions 34. More specifically, area Sa of elastic membrane 30a is larger than area Sb of elastic membrane 30b; area Sb of elastic membrane 30b is larger than area Sc of elastic membrane 30c; and area Sc of elastic membrane 30c is larger than area Sd of elastic membrane 30d. That is, elastic membranes 30a-30d are formed to satisfy the following relationship: Sa > Sb > Sc > Sd.
  • elastic membranes 30a-30d have different areas, their resonance frequencies in the out-of-plane direction of composite membrane 16 are different from each other. More specifically, assuming the resonance frequency of elastic membrane 30a to be first resonance frequency f1, the resonance frequency of elastic membrane 30b to be second resonance frequency f2, the resonance frequency of elastic membrane 30c to be third resonance frequency f3, and the resonance frequency of elastic membrane 30d to be fourth resonance frequency f4, the following relationship is established:f1 ⁇ f2 ⁇ f3 ⁇ f4.
  • elastic membranes 30a-30d are appropriately shaped such that their resonance frequencies match those of the intake pulsations at the first frequency, the second frequency, the third frequency and the fourth frequency, selected from among the intake pulsations at plural frequencies that form the intake pulsation generated in conjunction with the intake operation of engine 8. More specifically, first resonance frequency f1 of elastic membrane 30a matches the frequency of the intake pulsation at the first frequency, second resonance frequency f2 of elastic membrane 30b matches the frequency of the intake pulsation at the second frequency, third resonance frequency f3 of elastic membrane 30c matches the frequency of the intake pulsation at the third frequency, and fourth resonance frequency f4 of elastic membrane 30d matches the frequency of the intake pulsation at the fourth frequency.
  • the first frequency is lower than the second frequency
  • the second frequency is lower than the third frequency
  • the third frequency is lower than the fourth frequency. That is, the first frequency, second frequency, third frequency and fourth frequency satisfy the following relationship: first frequency ⁇ second frequency ⁇ third frequency ⁇ fourth frequency.
  • the first frequency is the frequency of the intake pulsation generated when the engine rotates at a prescribed rotational velocity R1
  • the second frequency is the frequency of the intake pulsation generated at a prescribed rotational velocity R2
  • the third frequency is the frequency of the intake pulsation generated at a prescribed rotational velocity R3
  • the fourth frequency is the frequency of the intake pulsation generated at a prescribed rotational velocity R4.
  • R1 is a rotational velocity lower than R2
  • R2 is a rotational velocity lower than R3
  • R3 is a rotational velocity lower than R4. That is, rotational velocities R1, R2, R3, R4 satisfy the following relationship: R1 ⁇ R2 ⁇ R3 ⁇ R4.
  • composite member 16 and device 1 is substantially the same as that of in the first embodiment.
  • the intake pulsation at the first frequency is propagated via connecting pipe 12 to the composite membrane 16.
  • the intake pulsation at the second frequency is propagated via connecting pipe 12 to the composite membrane 16 (elastic membrane).
  • the intake pulsation at the fourth frequency is propagated via connecting pipe 12 to composite membrane 16 (elastic membrane member).
  • composite membrane 16 is composed of four elastic membranes 30a-30d.
  • the second embodiment is not limited to this scheme. That is, viewing in the thickness direction of composite membrane 16, composite membrane 16 may be composed of five or more elastic membranes. In this case, composite membrane 16 may work with frequencies over a wider range than composite membrane 16 with just four elastic membranes 30a-30d as viewed in the thickness direction of composite membrane 16.
  • composite membrane 16 is comprised of four elastic membranes 30a-30d. Elastic membranes 30a-30d are formed with different areas, and their resonance frequencies for vibration in the out-of-plane direction of composite membrane 16 are different from each other.
  • the device for amplifying the suction noise of a vehicle in the first embodiment that is, the device for amplifying the suction noise of a vehicle having three elastic membranes as viewed in the thickness direction, it is possible to further expand the frequency range where the suction noise can be amplified, and it is possible to improve the sound quality of the suction noise transmitted into vehicle passenger compartment 2.
  • Figures 8 and 9 are diagrams illustrating the structure of device 1 that amplifies suction noise in the third embodiment.
  • Figure 8 is a diagram illustrating the structure of composite membrane 16
  • Figure 9 is a cross section taken across X-Y in Figure 8 .
  • the structure of device 1 that amplifies suction noise in the third embodiment is substantially the same as that of the first embodiment except for the structure of composite membrane 16. That is, the rigidity changing portion for composite membrane 16 in the third embodiment, is formed of convex portions 40 formed on the surface of composite membrane 16 on the intake duct side.
  • convex portions 40 are each generally V-shaped and project toward the intake duct side when composite member 16 is installed in connecting pipe 12.
  • the thickness of composite membrane 16 where convex portions 40 are formed is substantially equal to the thickness of the remaining portions. That is, composite membrane 16 is formed with a generally uniform thickness throughout.
  • Composite membrane 16 with convex portions 40 formed thereon, may be formed by integral molding using dies.
  • the remainder of the structure of device 1 is generally the same as that of the first embodiment.
  • acceleration mode While engine 8 is running, as the amount of accelerator pedal depression is increased, the airflow rate from air cleaner 22 to surge tank 26 is increased (hereinafter to be referred to as acceleration mode). As a result, while the rotational velocity of engine 8 is increased, the intake vacuum generated for the air in intake duct 10 rises (see Figure 2 ).
  • device 1 that amplifies the suction noise in the third embodiment has convex portions 40 formed on composite membrane 16, each being V-shaped and projecting to the intake duct side, and the thickness of composite membrane 16 is substantially uniform throughout when the shape is formed.
  • the third embodiment is not limited to this scheme.
  • a scheme may also be adopted in which the thickness of the portions of composite membrane 16 where convex portions 40 are positioned is thicker than the remaining portions.
  • convex portions 40 are each generally U-shaped as viewed in the radial direction of composite membrane 16, and the thickness of composite membrane 16 is substantially uniform throughout.
  • convex portions 40 are each U-shaped projecting toward the intake duct side as viewed in the radial direction of composite membrane 16, and the thickness of composite membrane 16 where convex portions 40 are formed is thicker than the remaining portions.
  • the rigidity changing portions in device 1 that amplifies suction noise in the present embodiment consist of convex portions 40 formed on the surface of composite membrane 16 on the intake duct side.
  • the third embodiment is not limited to this scheme, however.
  • the rigidity changing portions may also comprise generally concave portions 42 formed in the surface of composite membrane (elastic membrane member) 16 on the intake duct side.
  • a scheme may also be adopted in which the rigidity changing portions comprise generally convex portions 40 formed on the surface of composite membrane 16 on the external air side.
  • the device 1 for amplifying the suction noise of a vehicle in the third embodiment has rigidity changing portions that divide composite membrane 16 into plural elastic membranes by convex or concave portions 40, 42 formed on the surface of composite membrane 16 on the intake duct side.
  • composite membrane 16 may be formed with plural elastic membranes by means of a simple structure.
  • Figures 12 and 13 are diagrams illustrating the structure of composite membrane 16 for device 1 that amplifies suction noise in the fourth embodiment.
  • Figure 13 is a cross section of composite member 16 taken across Y-Y in Figure 12 .
  • the structure of device 1 that amplifies suction noise in the fourth embodiment is generally the same as that of the first embodiment except for the structure of composite membrane 16. That is, the rigidity changing portion of composite membrane 16 in the fourth embodiment is formed of convex portions 40 formed on the surface of composite membrane 16 on the intake duct side, and each convex portion 40 has a core member 44.
  • each convex portion 40 is generally nV-shaped and projects toward the intake duct side.
  • the thickness of the portions of composite membrane 16 where convex portions 40 are formed is substantially equal to the thickness of the remaining portions. That is, thickness of composite membrane 16 is substantially uniform throughout.
  • Core member 44 is made of a wire material more rigid than composite membrane 16, and it is arranged on the surface of composite membrane 16 on the external air side.
  • the remainder of the structure of device 1 is generally the same as that of the first embodiment 1.
  • acceleration mode While engine 8 is running, as the amount of accelerator pedal depression is increased, the airflow rate from air cleaner 22 to surge tank 26 is increased (hereinafter to be referred to as acceleration mode). As a result, while the rotational velocity of engine 8 is increased, the intake vacuum generated in the air inside intake duct 10 rises (see Figure 2 ).
  • Convex portions 40 formed on composite membrane 16 of device 1 that amplifies the suction noise in the present embodiment are each generally V-shaped and project to the intake duct side as viewed in the radial direction of composite membrane 16.
  • the thickness of composite membrane 16 is substantially uniform throughout when the shape is formed, and core member 44 is arranged on the surface of composite membrane 16 on the external air side.
  • the fourth embodiment is not limited to this scheme.
  • a scheme may also be adopted in which the thickness of composite film 16 where convex portions 40 are set is greater than in the remaining portions, with core member 44 being arranged inside convex portions 40 set on composite membrane 16.
  • each convex portion 40 is generally U-shaped as viewed in the radial direction of composite membrane 16.
  • a scheme may also be adopted in which each convex portion 40 of composite film 16 is generally U-shaped and projects toward the intake duct side as viewed from the radial direction of composite membrane 16, and the composite membrane 16 is formed thicker where convex portions 40 are set than in the remaining portions, with core member 44 being arranged inside the convex portions 40.
  • the rigidity changing portions of device 1 that amplifies suction noise in the fourth embodiment comprise convex portions 40 formed on the surface of composite membrane 16 on the intake duct side.
  • the fourth embodiment is not limited to this scheme.
  • the rigidity changing portions can also comprise concave portions 42 formed on the surface of the composite membrane 16 on the intake duct side, and as shown in Figures 15B and 15D , a scheme may also be adopted in which the rigidity changing portions consist of convex portions 40 formed on the surface of composite membrane 16 on the external air side.
  • the device 1 for amplifying the suction noise of a vehicle in the fourth embodiment has rigidity changing portions that divide composite membrane 16 into plural elastic membranes by convex portions 40 formed on the surface of the composite membrane on the intake duct side, and the convex portions each have a core member.
  • composite membrane 16 may be formed with plural elastic membranes with a simple structure, and at the same time, the strength of the convex portions 40 may be increased.
  • the strength of composite membrane 16 may be increased compared to that in the device for amplifying the suction noise of a vehicle in the third embodiment, so that the durability of composite membrane 16 may be improved.
  • Figure 16 is a diagram illustrating the structure of composite member 16 of device 1 that amplifies suction noise in the present embodiment.
  • the structure of device 1 that amplifies suction noise in the fifth embodiment is substantially the same as that of the first embodiment except for the structure of composite membrane 16. That is, elastic membranes 30a-30c of composite membrane 16 in the fifth embodiment are made of materials having different modulus values.
  • the modulus refers to the property representing resistance to deformation of the object per unit volume. When the deformation and stress are proportional to each other, the modulus is the proportionality coefficient, and it depends on the material.
  • rigidity refers to the proportionality coefficient between a bending and twisting force applied to a structural body and the overall change in the structural body. The factors determining rigidity include the modulus of the material, the dimensions, and the shape of the structure.
  • the rigidity when a material with a higher modulus is used, the rigidity is higher. When a single material is used, the thicker the sheet, the higher the rigidity. Also, the rigidity changes depending on the three-dimensional shape of the member that is obtained by pressing processes.
  • the modulus of elastic membrane 30a is lower than the modulus of elastic membrane 30b, and the modulus of elastic membrane 30b is lower than the modulus of elastic membrane 30c. Consequently, rigidity Ra of elastic membrane 30a is lower than rigidity Rb of elastic membrane 30b, and rigidity Rb of elastic membrane 30b is lower than rigidity Rc of elastic membrane 30c.
  • elastic membranes 30a-30c have different rigidities, their resonance frequencies for vibration in the out-of-plane direction of composite membrane 16 are different from each other. Also, elastic membrane 30 with a higher rigidity has a lower resonance frequency for vibration in the out-of-plane direction than does elastic membrane 30 with a lower rigidity. Consequently, for elastic membranes 30a-30c, assuming the resonance frequency of elastic membrane 30a to be first resonance frequency f1, the resonance frequency of elastic membrane 30b to be second resonance frequency f2, and the resonance frequency of elastic membrane 30c to be third resonance frequency f3, the relationship f1 ⁇ f2 ⁇ f3 is established.
  • elastic membranes 30a-30c are made of materials having different modulus values. As a result, the structure is divided into three elastic membranes 30a-30c without providing slots or other rigidity changing portions on the intake duct side of composite membrane 16.
  • acceleration mode While engine 8 is running, as the amount of accelerator pedal depression is increased, the airflow rate from air cleaner 22 to surge tank 26 is increased (hereinafter to be referred to as acceleration mode). As a result, while the rotational velocity of engine 8 is increased, the intake vacuum generated in the air inside intake duct 10 rises (see Figure 2 ).
  • the intake pulsation at the first frequency, the intake pulsation at the second frequency and the intake pulsation at the third frequency are amplified, and the amplified suction noise is emitted to the external air side from additional pipe 14 (see Figure 2 ).
  • elastic membranes 30a-30c of device 1 that amplifies the suction noise have rigidities different from each other, so that their resonance frequencies for vibration in the out-of-plane direction of composite membrane 16 are different from each other.
  • the fifth embodiment is not limited to this scheme. That is, a scheme may also be adopted in which elastic membranes 30a-30c are made of materials having different mass values, so that they have different resonance frequencies for vibration in the out-of-plane direction of composite membrane 16. Also, one may adopt a scheme in which elastic membranes 30a-30c are made of materials different from each other with respect to their modulus and/or mass, so that they have different resonance frequencies for vibration in the out-of-plane direction of composite membrane 16.
  • elastic membranes 30a-30c are made of materials having different modulus values.
  • the structure is provided with three divided elastic membranes 30a-30c without setting slots or other rigidity changing portions on the intake duct side of composite membrane 16.
  • the fifth embodiment is not limited to this scheme.
  • a scheme may also be adopted in which composite membrane 16 is composed of three separated elastic membranes 30a-30c by forming slots or other rigidity changing portions on the surface of composite membrane (elastic membrane member) 16 on the intake duct side, just as in any of the previous embodiments.
  • composite membrane 16 of the device 1 for amplifying the suction noise of a vehicle in the fifth embodiment is composed of three elastic membranes. Because the elastic membranes have different rigidity values, their resonance frequencies for vibration in the out-of-plane direction of composite membrane 16 are different from each other.
  • the intake pulsation at the first frequency, the intake pulsation at the second frequency and the intake pulsation at the third frequency are amplified corresponding to changes in the rotational velocity of engine 8, and the amplified suction noise is emitted to the external air side from the second opening of the additional pipe.
  • the emitted suction noise is propagated via dash panel 4 into vehicle passenger compartment 2, and an impressive suction noise is transmitted into vehicle passenger compartment 2.
  • composite membrane 16 of the device 1 for amplifying suction noise in the fifth embodiment is composed of three elastic membranes, and these elastic membranes are made of materials with different modulus values, so that they have different frequencies for vibration in the out-of-plane direction of composite membrane 16.
  • composite membrane 16 in the device 1 for amplifying the suction noise of a vehicle in the fifth embodiment has elastic membranes made of materials having different modulus values
  • composite membrane 16 is constituted as three separated elastic membranes without the provision of slots or other rigidity changing portions on the surface of composite membrane 16 on the intake duct side.
  • composite membrane 16 is improved due to the lack of rigidity changing portions with thicknesses different from other portions set at the boundaries between adjacent elastic membranes of composite membrane 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Claims (8)

  1. Vorrichtung zum Verstärken des Ansauggeräusches eines Fahrzeugs, umfassend:
    einen Ansaugkanal (10) zum Zuführen von Luft zu einer Motoransaugöffnung, ein Verbindungsrohr (12), das mit einem Inneren des Ansaugkanals (10) verbunden ist, eine Kompositmembran (16), die innerhalb des Verbindungsrohres (12) positioniert ist;
    wobei die Kompositmembran (16) da zu ausgebildet ist, einen inneren Durchgang zu sperren, der in dem Verbindungsrohr (12) ausgebildet ist,
    dadurch gekennzeichnet, dass
    die Kompositmembran (16) mindestens zwei elastische Membranen (30a, 30b, 30c) aufweist, wobei sich entweder die Massen oder die Steifigkeiten oder beide voneinander unterscheiden; und
    die Kompositmembran (16) ferner einen Steifigkeitsänderungsabschnitt (40, 42) umfasst, der zwischen den mindestens zwei elastischen Membranen (30a, 30b, 30c) ausgebildet ist, wobei die Steifigkeit des Steifigkeitsänderungsabschnitts von derjenigen der mindestens zwei elastischen Membranen verschieden ist.
  2. Vorrichtung gemäß Anspruch 1, wobei die mindestens zwei elastischen Membranen (30a, 30b, 30c) voneinander verschiedene Flächen aufweisen.
  3. Vorrichtung gemäß Anspruch 1 oder Anspruch 2, wobei die mindestens zwei elastischen Membranen (30a, 30b, 30c) aus Materialien hergestellt sind, die voneinander verschiedene Moduln und/oder Dichten aufweisen.
  4. Vorrichtung gemäß einem der Ansprüche 1 bis 3, wobei die mindestens zwei elastischen Membranen (30a, 30b, 30c) voneinander verschiedene Dicken aufweisen.
  5. Vorrichtung gemäß einem der Ansprüche 1 bis 4, wobei der Steifigkeitsänderungsabschnitt (40, 42) entweder ein konvexer Abschnitt oder ein konkaver Abschnitt ist, der auf einer Fläche der Kompositmembran ausgebildet ist.
  6. Vorrichtung gemäß einem der Ansprüche 1 bis 5, wobei der Steifigkeitsänderungsabschnitt (40, 42) ferner ein Kernelement mit einer Steifigkeit umfasst, die höher ist als diejenige der elastischen Membranen.
  7. Vorrichtung gemäß einem der Ansprüche 1 bis 6, wobei der Steifigkeitsänderungsabschnitt (40, 42) umfasst:
    mindestens einen ringförmigen Steifigkeitsänderungsabschnitt (36) mit einer allgemein kreisförmigen oder elliptischen Form, der einwärts von einem Außenumfang der Kompositmembran angeordnet ist, und
    radiale Steifigkeitsänderungsabschnitte (38a, 38b, 38c), welche sich von dem ringförmigen Steifigkeitsänderungsabschnitt (36) zu dem Außenumfang der Kompositmembran erstrecken und welche den Bereich zwischen dem Abschnitt, der von dem ringförmigen Steifigkeitsänderungsabschnitt umgeben ist, und dem Außenumfang der Kompositmembran in mindestens zwei Abschnitte aufteilen.
  8. Kraftmaschine oder Fahrzeug, mit einer Vorrichtung gemäß einem der vorhergehenden Ansprüche.
EP07109532A 2006-06-05 2007-06-04 Verbesserungen bei oder im Zusammenhang mit Fahrzeuggeräuschen Expired - Fee Related EP1865187B1 (de)

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Application Number Priority Date Filing Date Title
JP2006155945A JP4661695B2 (ja) 2006-06-05 2006-06-05 吸気音強調装置

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EP1865187A3 EP1865187A3 (de) 2008-12-24
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CN101086240B (zh) 2010-06-09
DE602007011001D1 (de) 2011-01-20
CN101086240A (zh) 2007-12-12
EP1865187A2 (de) 2007-12-12
JP4661695B2 (ja) 2011-03-30
EP1865187A3 (de) 2008-12-24
USRE42490E1 (en) 2011-06-28
JP2007321724A (ja) 2007-12-13

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