JP2005527740A - Device for correcting sounds in automobiles - Google Patents

Abstract

The present invention relates to an apparatus for correcting sound in an automobile. Said device comprises a hollow body (6) which is divided into at least two spaces by at least one acoustic transmission means (7). According to the invention, one space is connected by an inlet line (3) to a gas transmission part of an internal combustion engine arranged in the automobile, and the other space is an outlet line (10 in and / or around the automobile). ). A valve device (11) is arranged in the inlet line (3) and / or the outlet line (10), said valve reducing the cross section of each conduit according to the control variable.

Description

  The present invention relates to a device for modifying the sound in a motor vehicle of the type more specifically defined in the preamble of claim 1.

  A common type of device is described in US Pat. With such a device, the sound produced by the internal combustion engine is transmitted to the driver of the vehicle, in particular during acceleration, allowing a more focused driving experience on the one hand and conveying more information on the load state of the internal combustion engine on the other hand. It is intended to communicate more strongly.

  However, the disadvantage of this known device is its relatively low efficiency and very inflexible transmission characteristics.

  In U.S. Pat. No. 6,057,059, attempts were made to improve this overall efficiency of the device. However, the optimal solution has not yet been proposed here, especially because the transfer characteristics are still relatively inflexible.

German Patent Application Publication No. 4435296A1 German Patent Application No. 10042012A1

  In various applications, it is desirable to make the amount of sound (noise) transmitted particularly dependent on the engine load, but this cannot be realized with known devices.

  Accordingly, it is an object of the present invention to provide a device for modifying the sound in a motor vehicle, and in certain driving situations, the transmission of sound produced by the engine in the interior space of the motor vehicle and / or around the motor vehicle and in particular its The object is to provide a device that can influence the amount of sound.

  This object is achieved according to the invention by the features described in claim 1.

  The valve device according to the invention in a line connected to or extending from the hollow body reduces the cross-section of each line, and thus in the interior space and / or around the vehicle by the device according to the invention. It affects the sound that is transmitted, and to be precise, it can particularly affect the amount of sound.

  The valve device in this case follows the control variable. Depending on the application or according to the desired sound transmission by the device according to the invention, various control variables are conceivable.

  In an advantageous embodiment of the invention, for example, the control variable may be the internal pressure of the gas transport line. In this way, the dependence of sound transmission on each load state of the engine is achieved. This makes it possible to transmit the corresponding information on the engine load state to the driver of the vehicle particularly advantageously.

  In this connection, the gas carrying line is an intake line connected to the engine, and a control line for branching the pressure may be branched from the upstream in the direction of the flow of the throttle valve arranged in the intake line. .

  By branching the pressure in the intake line upstream of the throttle valve, a precise coupling of the transmitted sound to the position of the throttle valve, in principle the position of the gas pedal (throttle interlocking device) is established. When driving in a type, a corresponding sound transmission to the driver is produced.

  The simple structural design in the case of this embodiment is that the valve device is directly affected by the opening of the control line in the valve device, so that in the intake line, which mainly depends on the position of the throttle valve. May be actuated by the pressure of.

  Further advantageous refinements and developments of the invention are provided by the remaining dependent claims and the following exemplary embodiments whose principles are described on the basis of the drawings.

  FIG. 1 shows an intake line 2, generally a gas transport line, leading to an internal combustion engine 1, which is connected via an inlet line 3 to a device 4 for correcting the sound produced by the internal combustion engine 1. . Instead of branching from the intake line 2, the inlet line 3 may be branched from another gas transport line of the internal combustion engine 1, for example from the exhaust line. Like the internal combustion engine 1, the intake line 2 and the inlet line 3, the device 4 is disposed in the automobile (not shown) and affects the sound transmitted to both the interior space 5 of the automobile and the surroundings of the automobile. Can do. The basic structure and operating principle of the device 4 are described, for example, in German Offenlegungsschrift 10042012A1.

  The device 4 has a hollow body 6 which is subdivided into two spaces, namely an inlet space 8 and an outlet space 9, by means of acoustic transmission means 7 formed in this case by a gas-impermeable thin film 7a which can be vibrated. . The thin film 7 a is made of a gas-impermeable material in order to prevent gas from overflowing from the intake line 2 into the outlet line 10.

  The entrance space 8 is connected to the entrance line 3. In this case, the exit line 10 connected to the indoor space 5 is connected to the exit space 9. However, it is also possible to connect the exit line 10 to a space around the vehicle not shown here. Sound generated in the intake line 2 due to pressure surge or pressure difference is guided into the inlet space 8 of the hollow body 6 via the inlet line 3, whereby the acoustic transmission means 7 acts and causes vibration. When acting in this way, the acoustic transmission means 7 vibrates at a typical natural frequency and is transmitted to the outlet line 10 by the air in the outlet space 9.

  In this case, it is the valve device 11 that is arranged in the outlet line 10. The valve device 11 serves the purpose of reducing the cross section of the outlet line 10 and consequently affecting the sound produced by the acoustic transmission means 7 and further carried by the outlet line 10. The amount transmitted is reduced by reducing the cross section of the outlet line 10. The valve device 11 is controlled depending on the control variables described in more detail below on the basis of a particularly preferred exemplary embodiment.

  In the embodiment of the device 4 according to FIG. 2, the valve device 11 is arranged in the inlet line 3 which is itself adjacent to the intake line 2 and branches off from the known collecting tank 2a, so that the cross-section of said inlet line is reduced. can do. In principle, the valve device 11 can be arranged in the inlet line 3 and / or the outlet line 10. A control line 13 branches from the upstream side of the throttle valve 12 arranged in the inlet line 2, and this control line 13 opens in the housing 14 of the valve device 11. The state shown in the figure is a case where the driver accelerates and the internal combustion engine 1 is operated at full load or at least high load. In this state, the throttle valve 12 is open. The open throttle valve 12 has the same pressure in the intake line 2, the inlet line 3, the valve device 11 and the inlet space 8 that reaches the control line 13, so that there is no pressure difference and therefore the inlet line 3 This has the effect that the sound generated in the intake line 2 can reach the unsqueezed acoustic transmission means 7 without reducing the cross section. This is also reasonable, i.e. desirable, in the open state of the throttle valve 12. This is because the above-mentioned acoustic information should be supplied from the internal combustion engine 1 to the driver, particularly when the internal combustion engine 1 is in a load state.

  However, as shown in FIG. 3, when the throttle valve 12 is in the closed state, the pressure in the control line 13 branched from the upstream side of the throttle valve 12 is in the intake line 2, the inlet line 3, and the valve device 11. Higher than in. In this position of the throttle valve 12, the influence of the valve device 11 by the control line 13 shuts off (closes) the valve device 11 and consequently reduces the cross section of the inlet line 3, as will be explained below. . As a result, in the closed state of the valve device 11, the sound produced in the intake line 2 is no longer transmitted in the inlet space 8, to the acoustic transmission means 7, or only at a greatly reduced level, whereby the automobile The driver receives only a low level of acoustic feedback from the internal combustion engine 1 when the internal combustion engine 1 is in a low load state, or receives no acoustic feedback at all.

  In both FIG. 2 and FIG. 3, the acoustic transmission means 7 is formed not by the thin film 7a but by the vibratable element 7b. The oscillating element 7 b can oscillate around the rotation point 7 c, and as a result, the sound wave from the inlet space 3 is guided to the outlet line 10. The pivot point 7c is disposed on the acoustically inactive wall 7d. The wall 7d separates the inlet space 3 from the outlet space 10 and, as a result, prevents gas from overflowing into the outlet line 10 from the intake line 2 as in the thin film 7a described above.

  FIG. 4 shows the actual configuration of the valve device 11 having a flexible hose line 15. The hose line 15 is arranged in the housing 14 and its width is, as shown, precisely when the hose line 15 is subjected to pressure via the control line, to be precise, in the inlet line 3 if possible. The amount of passage is reduced to the amount that is completely shielded. This depends on the choice of material for the hose line 15. The hose line 15 may be made of silicone, for example. In order to hold the flexible hose line 15 in the housing 14, the hose line is fixed between the housing 14 and two pipes 16 and 17 which are arranged in the housing 14 and are axially spaced from each other. Has been.

  In an embodiment not shown, the control line 13 may open into the pressure measuring device instead of into the valve device 11. In this case, a control device that can open and close the valve device 11 depending on the pressure in the control line 13 is provided. In all cases, the valve device can be formed as an on-off valve and as a speed controllable valve.

  Furthermore, other control variables can be used for opening and closing the valve device 11, for example pressures distributed in the exhaust line, or variables determined by the driver of the vehicle. Also, for example, depending on the manner of driving by the driver, adaptive control for the valve device 11 such that the sound generated by the device 4 and guided to the indoor space 5 or the space around the vehicle is made smaller or larger. It is also conceivable to provide

1 is a schematic view of a device for correcting sound according to the invention with a valve device in the outlet line. The device shown in FIG. 1 with the valve device in the inlet line in the open state. The device of FIG. 2 with the valve device in a closed state. Fig. 4 shows an enlarged view of the valve device of Fig. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake line 3 Inlet line 4 The apparatus for correcting a sound 5 Car interior space 6 Hollow body 7 Sound transmission means 8 Inlet space 9 Outlet space 10 Outlet line 11 Valve apparatus 13 Control line

Claims (8)

An apparatus for modifying sound in a motor vehicle having a hollow body, the hollow body being divided into at least two spaces by at least one acoustic transmission means, wherein one space is introduced into the motor vehicle via an inlet line. In a device connected to the gas carrier of the internal combustion engine arranged, the other space being acoustically coupled to the interior space of the vehicle and / or the periphery of the vehicle by an outlet line,
A valve device (11) capable of reducing the cross section of each line (3, 10) depending on the control variable is arranged in the inlet line (3) and / or the outlet line (10). Features device.   2. A device according to claim 1, characterized in that the valve device (11) can completely shut off the lines (3, 10).   The apparatus according to claim 1, wherein the control variable is an internal pressure of the gas transport line. The gas conveying line (2) is an intake line (9) connected to the internal combustion engine (1),
The control line (13) for branching the pressure is branched from upstream in the direction of flow of a throttle valve (12) arranged in the intake line (2). apparatus.   5. Device according to claim 4, characterized in that the control line (13) opens into the valve device (11).   The control line (13) opens into the housing (14) of the valve device (11), the valve device (11) has a flexible hose line (15), and the hose line (15) 6. Device according to claim 5, characterized in that the cross-sectional area is reduced when the hose line (15) is subjected to pressure via the control line (13).   The flexible hose line (15) is fixed between the housing (14) and two pipes (16, 17) arranged inside the housing (14). 6. The apparatus according to 6. 5. A device according to claim 4, characterized in that the pressure in the control line (13) is measured by a measuring device and transmitted to a control device provided for controlling the valve device (11).

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