EP2604844B1 - Vehicle with air supply conduit - Google Patents

Description

The invention relates to a vehicle with an air supply line via an opening fresh air from the environment for air supply z. As a cooling or combustion, a drive and / or storage unit, wherein the air supply comprises a pipe section which is fixed in the region of a passenger compartment at least partially surrounding the passenger compartment housing.

For example, from the prior art DE 103 01 055 A1 an acoustic amplification of frequencies with large amplitude variation in an active noise cancellation system known. This method uses electronic components to selectively suppress existing sounds.

The publication 199 22 216 A1 teaches a sound transmission device for a motor vehicle that performs sound transmission from the intake tract to a passenger compartment, the connection having a cross-sectional widening to have resonances in a particular frequency band. In this case, a membrane arranged in a pipe branched off from this pipe is influenced from a pipe of the intake tract, which membrane is specifically aligned with the interior of a motor vehicle. However, this system does not work in a turbocharged internal combustion engine, as at the tapped point in a turbo engine are no longer sufficient pressure pulsations. These pressure pulsations are attenuated or smoothed by the turbo.

A similar device is from the patent application DE 197 04 376 A1 which describes an air filter assembly, wherein an acoustic connection of the air filter and passenger compartments is provided. This version is also not included a turbocharged internal combustion engine can be used. Also, this device does not impart noise to the environment.

EP 1 813 801 A1 describes an arrangement of an air cleaner tank disposed in an intake path disposed between an outside air intake port and an intake port of an engine. The air filter container comprises an acoustic transducer whose generated sound waves interfere with the sound waves occurring in the air filter container. These formed superimposed sound waves are directed by a branching off of the air filter tank pipe to the vehicle interior.

It has been recognized by the inventor that it is generally desirable to transmit noise resulting from the pressure pulsation in the intake tract into the interior of the vehicle in order to give the driver an authentic feedback on the load condition of the engine or to produce a specific noise. The driver's acceptance of the engine noise is compromised when there is some discrepancy between the noise of the engine sensed inside the passenger compartment and the sound of the engine outside the passenger compartment. The driver is irritated when the engine outside the passenger compartment is much quieter than in the vehicle itself. Furthermore, an acceptance of the engine noise by the driver requires some authenticity of the engine noise.

The invention has the object of providing a vehicle with an air supply line with the features of the preamble of claim 1 or 15 such that the driver both an authentic engine noise, and this engine noise despite using a turbocharger in a simple and effective manner uniformly within the passenger compartment and outside the passenger compartment. This may well be a certain volume difference between inside and outside the passenger compartment of the engine noise, but the sound is very similar in nature and in particular identical.

This object is solved by the features of claim 1. Advantageous developments of the invention will become apparent from the dependent claims 2 to 14.

As a core of the invention, it is considered that the pipe section is connected back to a sound insertion unit, which at least temporarily introduces a sound into the pipe section, the sound insertion unit is connected to a transmission means and via the transmission means the sound insertion unit is controlled by signals and / or excitable wherein the pipe section is acoustically coupled to the environment and the passenger compartment so that the sound introduced by the sound insertion unit into the pipe section can be coupled into the environment and to the passenger compartment and / or radiated in. Thus, a supply line of a vehicle connected to a sound input unit is used as the sound box, in particular, the pipe section itself is used as the sound box. Due to the fact that the pipe section or this resonance body with both the passenger compartment and the passenger compartment by z. B. whose connection is acoustically coupled with this and on the other side of the pipe section through its opening to the environment is also acoustically coupled to this, the sound produced there or the affected noise is radiated through the pipe section similar in the environment and in the passenger compartment , This measure is simple constructive executable and has a high efficiency to achieve a high level of acceptance by the driver, since the sound sounds similar inside and outside the vehicle and the sound works in a simple manner authentic.

In order to increase the driver's acceptance of the noise characteristic of his vehicle, it is provided according to the invention to interpret the linearly evaluated sound pressure within the passenger compartment and in the environment at one meter distance from the opening such that it is equal or offset by a maximum of 3 dB ,

In an advantageous development of the invention, the fresh air supplied in the air supply line serves an internal combustion engine, wherein preferably at least one compressor of an exhaust gas turbo and / or compressor unit is arranged after the pipe section and in front of the engine, which is run through by the fresh air. In particular, in vehicles comprising an exhaust gas turbocharger or a compressor unit, the equalization of the pressure pulsations of the intake air, the typical noise characteristics of the engine is severely impaired for the subjective feeling of the driver negatively. This can be especially with at Exhaust gas turbochargers or compressor units provided vehicles by the use of the pipe section as a sound box for both the environment and for the noise of the passenger compartment to achieve a greater positive influence on the sense of noise.

In a preferred embodiment, the signal and / or the excitation of the sound input unit is at least partially influenced by the structure-borne sound components generated by the internal combustion engine, whereby the structure-borne sound components on the internal combustion engine and / or on a component acoustically operatively connected to the internal combustion engine can be removed. For example, the activation takes place under the excitation of the sound insertion unit or the signal at least partially mechanically, wherein transmission means such. B. a pipe or rod connection, which is connected at a first end portion with the internal combustion engine and / or connected to an internal combustion engine component and is connected at a second end portion with the sound insertion unit. In particular, the pipe connection with its second end region can have a membrane or another flexible element that separates the interior of the pipe connection to the interior of the pipe section. Thus, the end of the pipe connection acts similar to a speaker or sound transducer, which introduces noise as a sound input unit in the pipe section and the pipe section in turn emits the sound as a sound box both in the passenger compartment and the environment of the vehicle similar.

Alternatively or in addition to a mechanical design of the sound insertion unit, this can also be at least partially electrically and / or electronically, for example, the control and / or the excitation of the sound insertion unit is preferably transmitted via a transmission means which is designed as a current-conducting element wherein a current signal to a trained as a speaker or transducer sound insertion unit is transported and in turn changed the noise within the pipe section and the sound generated there over the resonant body aspect of the pipe section to the environment emits the same to the passenger compartment.

A particularly advantageous and authentic noise influence within the tube section of the sound insertion unit can be achieved by tapping the signal from a microphone or pickup in the region of the internal combustion engine and preferably by modifying it before reaching the sound insertion unit. As a function of the signal and / or in dependence on at least one further input information, a modification of the signal can be carried out by the modification device, preferably vehicle operating, driver desired and / or location information can be used as input information. For example, the signal picked up by a pickup on the internal combustion engine is stamped with a modification in order to change the signal depending on the driver's request and / or pending location information. For example, recognizes a GPS device as location information that it is located within a closed locality and thus acts on the signal so that it generates a lower noise level by influencing the sound insertion unit in the pipe section and thus in the sound box.

On the other hand, a specific driver request such. B. Full throttle or kickdown or a certain vehicle operating condition such as operating the internal combustion engine in a high speed range have a modification of the signal that the signal affects the sound insertion unit such that the resulting noise from the sound insertion unit and the pipe section (sound box) a higher and / or more powerful "sound" to provide the driver with more "feedback" about the load condition of the engine.

Also, a temporarily higher volume of perceptible in the passenger compartment and in the environment engine noise that are controllable by the vehicle operation or driver information described above, warn the environment of the vehicle from its higher acceleration and thus increase the passive safety of road traffic.

The modification allows a lower engine noise emission for defined operating phases of the vehicle (eg highway travel in normal speed range / constant speed) and a higher one for further operating phases Engine noise emission (eg overtaking maneuvers, acceleration, low speed in traffic areas and / or reverse) to obtain.

Preferably, the means of a Fourier analysis with a frequency separation of <4 Hz, wherein the sound pressure level with a constant of <0.125 seconds can be determined. In particular, taking into account the defined limit of deviations from the environment and interior noise described here, the acceptance of the operator of the vehicle with respect to the engine noise is positively influenced. at least forms a part of the protective element. In a particularly preferred embodiment, the predominant (> 20%) area of the elastic and thus weaker formed first portion of the pipe section of the passenger compartment housing of mechanical influences such. B. Rockfall protected.

In order to achieve a particularly advantageous noise emission to the environment, it is advantageous if the opening of the pipe section to the environment has at least a round and / or oval cross section and / or alternatively additionally the pipe section in the region of the sound input device has a flow cross section of at least 10 cm ² of at least 20 cm ² , more preferably of at least 30 cm ² . The pipe section in the section that comprises the sound introducing device and thus forms a resonator body should have a volume range of at least 2000 cm ³ , preferably at least 3500 cm ³ , more preferably at least 4500 cm ³ , wherein the volume range is limited by that within there are no cross-sectional constrictions of more than 15%. Thus, the volume range is defined as the resonance body without substantial constrictions as a volume space.

In a further advantageous embodiment, the pipe section is provided, at least in regions, with a vibration influencing region, which comprises a jacket surface and a vibration influencing surface, wherein the jacket surface and the vibration influencing surface have different elasticities. By such Schwingeineinflussbereiche the vibration behavior of the entire pipe section can be selectively influenced both activated and deactivated in the sound insertion unit. In other words, the oscillation influence region serves for the targeted change of the resonance body and thus the sound emission characteristic of the pipe section. Further information on an embodiment according to the invention of the vibration-influencing surfaces on the pipe section will be apparent from the German patent application with the application number 10 2011 112 157.2 show, there are these Schwingeinflussbereiche described on an oil pan. In the context of the invention these Schwingeinflussbereiche are part of the preferably made of plastic pipe section. On the properties, effects and Dimeonsionierungen is fully on the content of the German patent application with the application number 10 2011 112 157.2 Referenced.

Alternatively or additionally, the pipe section may be provided with a rib structure, which is preferably arranged at least in regions on the outside of the pipe section. The rib structure is designed such that it effects extinction of sound in the near field. In this case, reference is made in full to the rib structure and its effect and their nature from the German patent application with the application number 10 2011 112 313.3 , By the rib structure, the resonance effect of the pipe section can be selectively changed. For example, a rib structure is provided on defined surface sections of the pipe section and not on further surface sections.

In addition to the device aspects, the invention also aims at a method for influencing the sound radiation of a vehicle, wherein the drive and / or storage unit is supplied with fresh air and a pipe section for conveying the fresh air is arranged in the region of a passenger compartment housing. In this case, the pipe section is operatively connected to a sound insertion unit which at least temporarily introduces a sound into the pipe section, wherein the sound insertion unit is connected to a transmission means and via the transmission means the sound insertion unit can be controlled and / or excited. Here, the pipe section to the environment and the passenger compartment is acoustically coupled in such a way that the sound introduced by the sound insertion unit into the pipe section can be coupled in or emitted to the environment as well as into the passenger compartment. Furthermore, the method provides that the signal for controlling the sound insertion unit is picked up and / or modified mechanically and / or electrically / electronically by an engine component or a component close to the engine.

The invention is explained in more detail with reference to embodiments in the drawing figures.

Fig.1:

eine schematische Darstellung eines Fahrzeugs mit einer Luftzuführung gemäß des Erfindungsgegenstandes;

Fig. 2:

eine schematische vergrößerte Darstellung des Fahrzeugs gemäß 1;

Fig. 3:

eine schematische Darstellung einer alternativen Ausführungsform des in Fig. 2 dargestellten erfindungsgemäßen Fahrzeugs;

Fig. 4:

eine schematische Detaildarstellung im Vollschnitt eines Klangeinflussbereiches gemäß Detail IV aus Zeichnungsfigur 3;

Fig. 5:

eine schematische Vollschnittdarstellung im Querschnitt des Rohrabschnittes mit einer Rippenstruktur;

Fig. 6:

eine schematische Draufsicht auf eine in Zeichnungsfigur 5 dargestellte Rippenstruktur des Rohrabschnittes.

These show:

Fig.1:

a schematic representation of a vehicle with an air supply according to the subject invention;

Fig. 2:

a schematic enlarged view of the vehicle according to FIG. 1;

3:

a schematic representation of an alternative embodiment of the in Fig. 2 illustrated vehicle according to the invention;

4:

a schematic detail view in full section of a Klangeinflussbereiches according to detail IV of Figure 3;

Fig. 5:

a schematic full sectional view in cross section of the pipe section with a rib structure;

Fig. 6:

a schematic plan view of a rib structure shown in Figure 5 of the pipe section.

In the drawing figures, the inventive concept is shown using a preferred embodiment of a tractor. In principle, the subject of the invention can also be used on a truck, tanks, tractors, construction machines and / or other on- or off-road vehicles. This concept of air supply is particularly suitable for commercial vehicles. In drawing figure 1, an air supply line 1 is shown, which via an opening 2 fresh air from the environment for supplying air to a drive and / or storage unit, here shown as a motor 3, supplies. The air supply line 1 in this case comprises a pipe section 4 which is fastened in the region of a passenger compartment 6 surrounding a passenger compartment 5. The vehicle according to the invention has a sound insertion unit 7 which is operatively connected to the pipe section 4 and which at least temporarily introduces a sound into the pipe section 4. Furthermore, the sound insertion unit 7 is connected to a transmission means 8 and via the transmission means 8, the sound insertion unit 7 is driven or excitable by signals, so that varies depending on the nature of the signals introduced into the pipe section 4 sound. Moreover, the pipe section 4 is acoustically coupled to the environment and at the same time to the passenger compartment 5 such that the sound introduced by the sound insertion unit 7 into the pipe section 4 is coupled into the environment and at the same time into the passenger compartment 5.

The vehicle shown is designed as a tractor and includes an internal combustion engine 3 wherein the fresh air supplied through the pipe section 4 is guided and charged by a compressor region 9 of an exhaust gas turbocharger 10 wherein the charged fresh air is supplied to the motor 3. After the combustion process, the exhaust gas passes via an exhaust pipe 11 a (manifold) to a turbine section 12 of the exhaust gas turbocharger 10 and from there via the exhaust pipe 11 b in an exhaust aftertreatment system 13 and finally through an opening 14 into the environment. The compressor 9 is connected via a shaft to the turbine region 12 and together forms the exhaust gas turbocharger 10. The exhaust gas aftertreatment system 13 comprises one or more catalysts and serves to purify the combustion gas.

Instead of an exhaust gas turbocharger 10, a compressor unit (not shown) which is not driven by the exhaust gas pressure may also be arranged between the pipe section 4 and the engine 3.

In the embodiment shown in drawing Figure 2, the signal for controlling the sound input unit 7 is at least partially set depending on the structure-borne sound components generated by the internal combustion engine. These structure-borne sound components can be removed from the internal combustion engine itself and / or at a component which is acoustically operatively connected to the internal combustion engine. According to drawing Figure 2, the control and / or excitation of the sound insertion unit 7 takes place mechanically, wherein the transmission means 8 is formed as a pipe or rod connection, which at a first end portion 15 on the motor 3 and at a first end portion 15 opposite the second end portion 16 with the Sound insertion unit 7 is connected. In this case, the second end region 16 is provided with a membrane or a flexible element (not shown) through which the interior of the pipe connection to the interior 17 of the pipe section 4 is spatially separated.

The pipe section 4 is directly connected in the drawing figure via two coupling elements 18, 18 'to the passenger compartment housing 6 acoustically conductive. The coupling element 18, 18 'in this case has a natural frequency in the range of 10 to 150 Hz. The coupling elements 18, 18 'are formed, for example, as a sleeve-like rubber buffer, through the central bore fixing means 19, 19', are performed, wherein the fixing means 19, 19 ', the mechanical fixation or attachment Ensure the pipe section 4 with the passenger compartment housing 6. The coupling elements 18, 18 'rather serve the desired acoustic connection and the conduction of the sound starting from the pipe section 4 to the passenger compartment housing 6. In a further advantageous embodiment, the transmission means 8 in at least one of the coupling elements 18, 18' integrated.

In the illustrated embodiment, the pipe section 4 is arranged at the rear end of the passenger compartment housing 6 parallel thereto. In this case, the pipe section 4 with the passenger compartment housing 6 forms a projection surface 20 which is at least 100 cm ² . Furthermore, the at least two acoustically connecting coupling elements 18, 18 'which are acoustically connected to the tubular section 4 are arranged at a distance from one another, wherein the spacing 21 comprises at least 20 cm.

Alternatively or in addition to the mechanical transmission of structure-borne noise from the engine 3 to the sound input unit 7, this can also be done electrically and / or electronically, cf. FIG. 3 , The transmission means 8 is in this case preferably designed as a current-conducting element which transports a current signal to a trained as a speaker or sound transducer sound insertion unit 7. In this case, the structure-borne noise of the engine 3 or a component operatively connected to the engine 3 is picked up by a microphone and / or a pickup. In a further embodiment according to FIG 3, the signal is picked up by a microphone or pickup as a structure-borne sound pickup 22 on the motor 3 and performed by the transmission means 8 before reaching the sound insertion unit 7 by a modification device 23. The signal is modified within the modification device 23, it being possible for the modification device 23 to make a modification of the signal as a function of the signal and / or as a function of at least one further input information 24, 24 '. Vehicle operating, driver request and / or location information (GPS, Galileo or information derived therefrom, such as speed restrictions), for example, can be used as input information 24, 24 'and, depending on the respective values / information, relay the signal to the sound application unit 7 thus affect the noise within the pipe section 4 and finally within the passenger compartment housing 6.

Since the pipe section 4 does not require the same mechanical protection on all its sides in its position arranged behind the passenger compartment housing 6, since the passenger compartment housing 6 itself acts as mechanical protection on the side facing the passenger compartment housing 6, it is advantageous if the pipe section 4 in FIG first and second regions with different elasticity is formed, wherein the wall thickness of the pipe section 4 in the first region is less and / or less provided with stiffening elements than the second region. The second region is arranged substantially on the opposite side within a cross-sectional plane which runs perpendicular to the longitudinal axis 25 of an elongate tubular section 4. Particularly preferably, the longitudinal axis 25 simultaneously forms the main flow direction 26 of the fresh air within the pipe section 4.

The elastic and less elastic regions of the pipe section 4 also contribute to the Schallabstrahlverhalten and thus to the noise and noise modification of the pipe section 4 at. The more elastic and e.g. mechanically weaker areas of the pipe section 4 may preferably be covered or protected by a protective element 27 which acts substantially like a shield. In the illustrated embodiment, the passenger compartment housing 6 may serve as a protective element 27 for the region of the pipe section 4 facing the passenger compartment housing 6. This is particularly suitable for the passenger compartment housing 6 facing side of the pipe section 4 in the final assembly state of the pipe section 4 for changing and / or acoustic "adjustment" of the pipe section 4. The opening 2 of the pipe section 4 to the environment is round and oval.

The pipe section 4 has a fresh air flow cross section 28 of at least 10 cm ² in the area of the sound insertion unit 7.

The sound introduction unit 7 has a volume area of at least 2,000 cm ³ , the volume area being limited and defined by no cross-sectional constriction of more than 15% within it. In order for the standing with the sound insertion unit 7 in connection space and thus the sound box of the pipe section 4 to be demarcated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With detail IV, a vibration influence region 29 is shown in drawing FIG. 3, which has a jacket surface 30 and a vibration influence surface 31, wherein the jacket surface 30 and the vibration influence surface 31 have different elasticities and / or are coupled to one another such that they can oscillate differently. In drawing figure 4, the detail IV is off FIG. 3 shown enlarged in section, it can be seen that the lateral surface 30 is provided with a stiffening this stiffening ribs 32, where against the Schwingeinflussfläche 31 no stiffening ribs 32 and thus has a higher elasticity and thus a different vibration behavior than the adjacent lateral surface 30. In the illustrated embodiment, the oscillation-influencing region 29 is designed in the manner of a pot, with the adjoining lateral surface 30, 30 ', 30 ", the jacket surface of the pot and the oscillation-influencing surface 31 forming the bottom of the pot.

The oscillation influence region 29 is arranged in the region between the passenger compartment housing 6 and the pipe section 4. At this installation location, the vibration influence region 29 of the pipe section 4, which may be partially weakened in its material thickness, is protected from mechanical influences by the protective element 27, here in the form of the passenger compartment housing 6, in a simple manner.

A further advantageous measure is when a sound in the near field extinguishing rib structure 33 is disposed on the pipe section 4 at least partially on its outside, cf. FIGS. 5 and 6 , Such a rib structure 33 functions as set out in the German patent application with the application number 10 2011 112 313.3, the content of this application is hereby incorporated by reference, in particular, the embodiment and description of the operation of the rib structure 33 and the chambers 34 reference. In drawing figure 6, the rib structure 33 is shown enlarged. In this case, it is essential that the ribs 39 or the chambers 34 formed by them are designed to be irregular relative to one another in such a way that the sound radiated through the bottom of the individual rib areas or chambers 34 is influenced / adjusted in such a way that it essentially coincides with canceled or at least reduced the generated in the adjacent chambers 34 sound. The ribs 39 are arranged relative to the base body to be understood as a pipe section 4 and dimensioned that only a slight stiffening of the body or the pipe section is accompanied, so that the component despite the ribs 39 has a natural frequency of 200 to 1000 Hz.

The maximum longitudinal extension 36 of the chambers 34 of the component is a maximum of 95 mm and a minimum of 5 mm. Within this range of values for the maximum longitudinal extent 36 of the chambers 34, the sound reduction in the near range, taking into account the wall thickness 37, is favorable. Preferably, this value range is applicable to at least 70%, preferably to all chambers 34 of the pipe section 4. A further increase in the near field sound reduction according to the invention is given by the narrower value range for the maximum longitudinal extent 36 of a maximum of 50 mm and a minimum of 10 mm. The maximum longitudinal extension 36 here is the maximum length within a chamber 34.

Rib height 38 plus chamber bottom thickness 35 is less than 4: 1, preferably less than or equal to 3.5: 1.0, more preferably less than or equal to 3: 1 relative to chamber bottom thickness 35. As a chamber floor thickness 35, for example, the material thickness of the pipe section 4 without ribs 34 can be used. Wall thickness 37 is less than or equal to chamber bottom thickness 35 and / or less than or equal to fin height 38. <B> LIST OF REFERENCES </ b> 1 air supply 26 main direction 2 Opening v. 1 27 protection element 3 engine 28 Fresh air flow area 4 pipe section 29 Vibrating sphere of influence 5 passenger compartment 30 lateral surface 6 Passenger cell case 31 Vibrating influence area 7 Schalleinbringeinheit 32 Verstreifungsrippen 8th transmission means 33 rib structure 9 compressor section 34 chamber 10 turbocharger 35 Chamber floor thickness 11a, 11b exhaust pipe 36 longitudinal extension 12 Turbine area v. 10 37 Wall thickness 13 Abgasnachbehandlungssys. 38 fin height 14 Opening v. 13 39 ribs 15 End area v. 8th 16 End area v. 8th 17 inner space 18.18 ' coupling element 19.19 ' fixer 20 Projection surface v. 4 on 6 21 Distance between 18,18 ' 22 Acoustic emission sensor 23 modification device 24.24 ' input information 25 Longitudinal axis v. 4

Claims (14)

1. Vehicle having an air feed line (1) which, via an opening (2), feeds fresh air from the surroundings for the supply of air to a drive and/or storage assembly, in particular an engine (3), wherein the air feed line (1) comprises a pipe section (4) which is fastened in the region of a passenger compartment housing (6) which at least regionally surrounds a passenger space (5), wherein the pipe section (4) is operatively connected to a sound introduction unit (7) which at least temporarily introduces sound into the pipe section (4), wherein the sound introduction unit (7) is connected to a transmission means (8) and, by way of the transmission means (8), the sound introduction unit (7) can be actuated and/or excited by signals, wherein the pipe section (4) is acoustically coupled to the surroundings and to the passenger space (5) such that the sound introduced into the pipe section (4) by the sound introduction unit (7) is coupled and/or radiated to the surroundings and into the passenger space (5), characterized in that the linearly evaluated sound pressure within the passenger space (6) and the linearly evaluated sound pressure in the surroundings at 1 m distance from the opening (2) are equal or differ by at most 3 dB.
2. Vehicle having an air feed line (1) according to Claim 1, characterized in that the fresh air is fed at least partially to an internal combustion engine for combustion, wherein it is preferably the case that, downstream of the pipe section (4) and upstream of the engine (3), the fresh air flows through at least one compressor (9) of an exhaust-gas turbocharging unit and/or supercharger unit.
3. Vehicle having an air feed line (1) according to Claim 1 or 2, characterized in that the signal for the actuation and/or excitation of the sound introduction unit (7) is at least partially dependent on body-borne sound components generated by the internal combustion engine, wherein the body-borne sound components can be picked off at the internal combustion engine and/or at a component acoustically operatively connected to the internal combustion engine.
4. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the actuation and/or excitation of the sound introduction unit (7) is performed at least partially mechanically, wherein the transmission means (8) is preferably in the form of a pipe or rod connection which, at a first end region, is connected to the internal combustion engine and/or to a component operatively connected to the internal combustion engine, and, at a second end region (16), is connected to the sound introduction unit (7), it particularly preferably being the case that the second end region (16) is equipped with a diaphragm or a flexible element which separates an interior space (17) of the pipe connection with respect to the interior space (17) of the pipe section (4).
5. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the actuation and/or excitation of the sound introduction unit (7) is performed at least partially electrically and/or electronically, wherein the transmission means (8) is preferably in the form of a current-conducting element and transports a current signal to a sound introduction unit (7) in the form of a loudspeaker or sound transducer.
6. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the signal is picked off by a microphone or sound pickup in the region of the internal combustion engine and can preferably be modified by way of a modification device (23) before reaching the sound introduction unit (7), wherein a modification of the signal can be performed by way of the modification device (23) in a manner dependent on the signal and/or in a manner dependent on at least one further item of input information (24, 24'), and items of vehicle operation information, items of driver demand information and/or items of location information can preferably be used as input information (24, 24') for the modification of the signal.
7. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the evaluation of the sound pressure is performed by way of a Fourier analysis with a frequency interval of < 4 Hz, wherein the sound pressure level can be determined with a time constant of ≤ 0.125 s.
8. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the pipe section (4) is directly acoustically connected, via at least one coupling element (18, 18'), to the passenger compartment housing (6), and the coupling element (18, 18') preferably has a natural frequency in the range from 10 - 150 Hz, and the coupling element (18, 18') particularly preferably forms an assembly with the fixing means (19, 19') which fastens the pipe section (4) to the passenger compartment housing (6), and/or said coupling element is at least regionally formed integrally with said fixing means (19, 19').
9. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the pipe section (4) overlaps the passenger compartment housing (6) over a projection area (20) of at least 100 cm², preferably over a projection area (20) of at least 1000 cm², particularly preferably over a projection area (20) of at least 2500 cm², and/or at least two coupling elements (18, 18') which acoustically connect the pipe section (4) to the passenger compartment housing (6) have a spacing (21) of at least 20 cm, preferably a spacing (21) of at least 50 cm, particularly preferably a spacing (21) of at least 100 cm.
10. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the pipe section (4) has first and second regions of different elasticity, and the wall thickness of the pipe section (4) in the first region is preferably smaller and/or equipped with fewer stiffening elements than the second region, and the two regions are particularly preferably situated at least regionally on opposite sides within a cross-section plane which runs perpendicular to the longitudinal axis (25) of the pipe section (4).
11. Vehicle having an air feed line (1) according to Claim 10, characterized in that the first region is of more elastic form than the second region and is arranged relative to a protective element (27) such that the protective element (27) covers the first region over at least 20% of the area of the first region, and preferably, in the fully assembled state, the second region is arranged so as to point away from the passenger compartment housing (6) and, in.the fully assembled state, the first region is arranged so as to point toward the passenger compartment housing (6), wherein the passenger compartment housing (6) forms at least a part of a protective element (27).
12. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the opening (2) of the pipe section (4) to the surroundings has at least a circular and/or oval cross section, and/or the pipe section (4) has, in the region of the sound introduction unit (6), a fresh-air flow cross section (28) of at least 10 cm², preferably of at least 20 cm² and particularly preferably of at least 30 cm².
13. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the pipe section (4), in the subsection which comprises the sound introduction unit (6), has a volume region of at least 2000 cm³, preferably of at least 3500 cm³, particularly preferably of at least 4500 cm³, wherein the volume region is limited by the fact that no cross-sectional constriction of greater than 15% occurs within said volume region.
14. Vehicle having an air feed line (1) according to one of the preceding claims, characterized in that the pipe section (4) comprises at least one vibration-influencing region (29) which comprises a shell surface (30) and a vibration-influencing surface (31), wherein the shell surface (30) and vibration-influencing surface (31) have different elasticities, and/or in that the pipe section (4) is at least regionally equipped, on its outer side, with a rib structure (33) which eliminates sound in the near field.

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