U.S. patent application number 10/998358 was filed with the patent office on 2005-06-09 for device for establishing noise in a motor vehicle.
Invention is credited to Hofmann, Marcus, Starobinski, Roudolf.
Application Number | 20050121255 10/998358 |
Document ID | / |
Family ID | 34635071 |
Filed Date | 2005-06-09 |
United States Patent
Application |
20050121255 |
Kind Code |
A1 |
Hofmann, Marcus ; et
al. |
June 9, 2005 |
Device for establishing noise in a motor vehicle
Abstract
In a device for establishing noise in a motor vehicle,
comprising a housing which is divided by a sound transmission
device into at least two spaces, of which one space is in
communication with a gas-carrying part of an internal combustion
engine arranged in the motor vehicle and the other space is
acoustically coupled to an interior space of the motor vehicle via
an outlet line, the outlet line is connected via a hollow rigid
deflecting element to an interior space lining element, the rigid
deflecting element being capable of transmitting forces applied
thereto by the sound radiation to the interior space lining
element.
Inventors: |
Hofmann, Marcus; (Stuttgart,
DE) ; Starobinski, Roudolf; (Hamburg, DE) |
Correspondence
Address: |
KLAUS J. BACH
4407 TWIN OAKS DRIVE
MURRYSVILLE
PA
15668
US
|
Family ID: |
34635071 |
Appl. No.: |
10/998358 |
Filed: |
November 27, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10998358 |
Nov 27, 2004 |
|
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PCT/EP03/03480 |
Apr 3, 2003 |
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Current U.S.
Class: |
181/250 ;
181/273; 181/276 |
Current CPC
Class: |
F02M 35/1294 20130101;
G10K 11/22 20130101 |
Class at
Publication: |
181/250 ;
181/273; 181/276 |
International
Class: |
F01N 001/02; F01N
001/08 |
Foreign Application Data
Date |
Code |
Application Number |
May 29, 2002 |
DE |
102 23 872.3 |
Claims
What is claimed is:
1. A device for establishing noise in a motor vehicle, comprising a
housing (5), a sound transmission device (6) disposed in the
housing (5) so as to divide the housing (5) into at least two
spaces (7, 8), an inlet line (3) extending between one of said
spaces (7) and a gas-carrying part (1) of an internal combustion
engine (2) arranged in the motor vehicle so as to be in
communication with the gas carrying part (1) and an outlet line (9)
connected to the other space (8) of the housing (8) for
acoustically coupling the other space (8) to an interior space (10)
of the motor vehicle, said outlet line (9) being connected to an
interior lining element (12) of the motor vehicle via a hollow
rigid deflecting element (11) formed in such a way that it is
capable of transmitting forces applied to it to the interior space
lining element (12) for transmitting the sound radiation into the
interior space (10) of the motor vehicle.
2. The device as claimed in claim 1, wherein a flexible connecting
element (13) is arranged between the outlet line (9) and the
deflecting element (11).
3. The device as claimed in claim 1, wherein an absorption material
(15) is arranged at the transition from the deflecting element (11)
to the interior space (10).
4. The device as claimed in claim 1, wherein a constricting element
(16) is arranged at the transition from the deflecting element (11)
to the interior space (10).
5. The device as claimed in claim 1, wherein a widening element
(21) is arranged at the transition from the deflecting element (11)
to the interior space (10).
6. The device as claimed in claim 1, wherein the deflecting element
(11) is angled by at least approximately 90.degree..
7. The device as claimed in claim 1, wherein the interior space
lining element (12) is acoustically decoupled from an interior
vehicle lining (14) at least partly lining the interior space (10)
or from a dashboard arranged in the interior space (10).
8. The device as claimed in claim 7, wherein the deflecting element
(11) includes a hollow body (17).
9. The device as claimed in claim 8, wherein the hollow body (17)
has two separate volumes (19, 20), which are in communication with
each other.
10. The device as claimed in claim 8, wherein the hollow body (17)
is connected to the interior space lining element (12) via at least
one rigid connecting element (18).
Description
[0001] This is a continuation-in-part application of international
application PCT/EP03/03480 filed Apr. 3, 2003 and claiming the
priority of German application 102 23 872.3 filed May 29, 2002.
BACKGROUND OF THE INVENTION
[0002] The invention relates to a device for establishing noise in
a motor vehicle including a housing which is divided by a sound
transmission device into at least two spaces of which one is in
communication with a gas-carrying part of an internal combustion
engine of the motor vehicle and the other space is acoustically
coupled to the vehicle interior.
[0003] Such a device is known, for example, from DE 44 35 296 A1.
Such devices are intended to transmit the noises produced by the
internal combustion engine more intensely to the driver of the
motor vehicle, in particular during acceleration, in order, on the
one hand, to provide for a more intensive driving experience and,
on the other hand, to provide to the driver more information
concerning the load state of the engine.
[0004] The disadvantages of this known device, however, are its
relatively low efficiency and the very inflexible transmission
characteristics.
[0005] DE 100 42 012 A1 attempts to improve the efficiency of the
overall device. However, an optimum solution in particular with
regard to more flexible transmission characteristics is still not
provided.
[0006] It is therefore the object of the present invention to
provide a device for establishing noise in a motor vehicle by which
the characteristics of the transmission of the noises and their
transmission from the engine into the interior space of the motor
vehicle are improved.
SUMMARY OF THE INVENTION
[0007] In a device for establishing noise in a motor vehicle,
comprising a housing which is divided by a sound transmission
device into at least two spaces, of which one space is in
communication with a gas-carrying part of an internal combustion
engine of the motor vehicle and the other space is acoustically
coupled to an interior space of the motor vehicle via an outlet
line, the outlet line is connected via a hollow rigid deflecting
element to an interior space lining element, the deflecting element
being capable of transmitting forces applied thereto by the sound
radiation to the interior space lining element.
[0008] A deflecting element according to the invention between the
outlet line and the interior lining element has the effect that the
sound waves that are produced by the sound transmission device and
introduced to the vehicle interior via the outlet line are
deflected in the direction of the interior space, whereby an
intensification of the sound effect is achieved. This intensified
sound effect leads to a force acting on the deflecting element,
which then, on account of the connection of the deflecting element
to the inner lining element, induces the latter to undergo
vibrations and in this way provides further intensification of the
sound effect.
[0009] Therefore, in addition to changing the sound radiation there
is also the advantageous effect that vibrations of the interior
lining element are produced, so that overall considerably improved
influencing of the noise in the interior space is possible by the
device according to the invention, enabling the driver to
acoustically perceive the load state of the engine.
[0010] The interior space of the motor vehicle can be insulated
considerably better in this way for protection from disturbing
external noises, without depriving the driver of acoustic
information concerning the load state of the engine.
[0011] Decoupling the outlet line from the deflecting element, and
the resultant possibility of intensifying the vibrations of the
interior lining element induced by the sound can be achieved if, in
an advantageous development of the invention, a flexible connecting
element is arranged between the outlet line and the deflecting
element.
[0012] In a further advantageous refinement of the invention, the
deflecting element may be a hollow body. This represents an
additional possibility for influencing the sound frequencies
radiated into the interior space by varying the volume of the
hollow body.
[0013] Advantageous refinements and embodiments of the invention
will be described below on the basis of the accompanying
drawing:
DETAILED DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 shows a first basic embodiment of the device
according to the invention;
[0015] FIG. 2 shows a first development of the device of FIG.
1;
[0016] FIG. 3 shows a second development of the device of FIG.
1;
[0017] FIG. 4 shows a third development of the device of FIG.
1;
[0018] FIG. 5 shows a development of the device shown in FIG. 4;
and
[0019] FIG. 6 shows a fourth development of the device of FIG.
1.
DETAILED DESCRIPTION OF THE VARIOUS EMBODIMENTS
[0020] FIG. 1 shows a gas-carrying line 1 of an internal combustion
engine 2, which may be an exhaust line or an intake line of the
engine 2. From the gas-carrying line 1, an inlet line 3 leads to a
device 4 for establishing engine noise in the interior of a motor
vehicle, which is not represented in its entirety the engine 2
being mounted in the motor vehicle in a way known per se.
[0021] The device 4, the basic construction and operating principle
of which are known for example from DE 100 42 012 A1, has a hollow
body 5, in the interior of which there is arranged a sound
transmission device. The sound transmission device in the present
case is formed as a vibratable membrane 6 and divides the hollow
body 2 into two spaces, namely an inlet space 7 and an outlet space
8. Of these, the inlet space 7 is connected to the inlet line 3 and
the outlet space 8 is connected to an outlet line 9 which leads to
an interior space 10 of the motor vehicle.
[0022] Vibrations or sound waves inside the gas-carrying line 1,
which are introduced into the hollow body 5 via the inlet line 3,
have the effect that the membrane 6 is induced to undergo
vibrations, which in turn are introduced as sound waves into the
interior space 10 via the outlet line 9. In this way, the driver of
the motor vehicle located in the interior space 10 is acoustically
informed about the load state of the engine 2.
[0023] The outlet line 9 is connected via a deflecting element 11
to an interior space lining element 12, a flexible connecting
element 13 being arranged between the outlet line 9 and the
deflecting element 11. On the side that is opposite the flexible
connecting element 13, the deflecting element 11 is attached
substantially rigidly to the interior space lining element 12. The
interior space lining element 12 is part of a complete interior
space lining 14, which at least partly lines the interior space 10
in a way not represented, but may also be part of a dashboard which
is not represented.
[0024] The deflecting element 11, consisting for example of
plastic, has the effect that the sound waves arriving via the
outlet line 9 are deflected, which leads to an acoustic flow, and
consequently to an intensification of the sound effect in the
interior space 10. In the present case, the deflecting element 11
has for this purpose an angle of substantially 90.degree., which
has proven to be the most suitable for the intensification of the
sound waves explained in more detail below. Of course, an angle of
the deflecting element 11 other than 90.degree. is conceivable in
particular installation cases.
[0025] The reacting force or counteracting force on the deflecting
element 11 that is produced as a result of the acoustic flow
described and is indicated by an arrow causes the deflecting
element to exert a force on the interior lining element 12, which
in turn induces the latter to undergo vibrations, and consequently
to produce sound of its own. These vibrations of the interior
lining element 12 intensify further the described acoustic
information for the driver with respect to the load state of the
engine 2. In the present case, the interior lining element 12 is
decoupled from the interior lining 14, in order to prevent the
complete interior lining 14 from vibrating and to offer the
interior lining element 12 an independent possibility of radiating
vibration. This makes it possible to provide the interior lining
element 12 with a special geometry, in order to achieve a further
possibility for influencing the way in which sound is produced.
However, this special geometry of the interior lining element 12 is
not discussed herein in detail.
[0026] FIG. 2 shows a development of the device 4 based on FIG. 1.
Arranged herein at the outlet of the device 4, that is at the
transition of the deflecting element 11 into the interior space 10,
is an absorption material 15, which influences the sound radiation
into the interior space 10. The absorption material 15 may have an
acoustic impedance of, for example, 40 rayl. The acoustic impedance
that is produced results in a further force, which acts on the
interior lining element 12.
[0027] FIG. 3 shows a further refinement of the device 4 shown in
FIG. 1. Arranged herein at the outlet or transition into the
interior space 10 is a constricting element 16, which may be
connected to the interior space lining element 12 or the deflecting
element 11 and extends into the interior space 10. The constricting
element 16 has the effect of increasing the flow velocity from the
deflecting element 11 into the interior space 10, and consequently
of achieving an intensification of the acoustic flow described
above, which leads to a higher resultant force on the deflecting
element 11, and consequently also to a stronger inducement to
vibrate.
[0028] A further configuration of the device 4 is represented in
FIG. 4. In this case the deflecting element 11 has a hollow body
17, which is connected via line elements 17a and 17b on the one
hand via the flexible connecting element 13 to the outlet line 9
and on the other hand to the interior lining element 12. The hollow
body 17 achieves the effect of further influencing the sound waves
produced or passed on by the sound transmission device or membrane
6, this influencing being dependent of course on the form, and in
particular the volume, of the hollow body 17 and being controllable
by changing these variables. To achieve the effect of inducing the
interior lining element 12 to vibrate in this case too, the hollow
body 17 is connected to the interior lining element 12 by means of
a rigid, rod-shaped connecting element 18.
[0029] FIG. 5 shows a development of the embodiment according to
FIG. 4. In this case the hollow body 17 has two volumes, namely a
first volume 19 and a second volume 20. The first volume 19 is
connected via the line element 17a and the flexible connecting
element 13 to the output line 9 and the second volume 20 is
connected via the line element 17b to the interior lining element
12. For connecting the first volume 19 to the second volume 20, a
further line element 17c is provided. In this case, too, the hollow
body 17 is connected via the rigid connecting element 18 to the
interior space lining element 12, for which purpose the connecting
element 18 extends between the interior lining element 12 and the
first volume 19.
[0030] FIG. 6 shows a further embodiment of the device 4, which in
this case has at the outlet into the interior space 10 a widening
element 21, which, by contrast with the constricting element 16
according to FIG. 3 provides a reduction of the reacting force on
the deflecting element 11 and consequently likewise serves for
influencing the sound radiation into the interior space 10.
[0031] All the embodiments that are represented in FIGS. 1 to 6 may
be combined with one another in any way desired if they are not
mutually exclusive. For example, the absorption material 15 may be
provided in all the embodiments and the decoupling of the interior
space lining element 12 from the interior vehicle lining 14 may be
provided in each case.
* * * * *