JP2001317420A - Conduit system having electromechanical transducer for generating corrective noise - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save a mounting space and component weight and to finally provide an economic solution. SOLUTION: A conduit system for conducting gas, especially an intake manifold of an internal combustion engine, comprises a conduit partition having an intake port and an electromechanical transducer for generating noise for affecting gas flow in the conduit partition, especially noise for correcting the intake noise of the internal combustion engine emitted through the intake port. The electromechanical transducer comprises an actuator for generating noise, especially a diaphragm, and a driving device for this actuator, especially an electric coil. The driving device is mounted in the conduit system so as to be exposed to the gas flow transported in the conduit system and/or to communicate to the clean side of the conduit partition formed by a filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduit system for conducting gas, in particular to an intake manifold of an internal combustion engine, provided with a conduit section having an intake port, which influences the gas flow in the conduit section. An electromagnetic or electromechanical transducer is provided for generating noise for compensating the noise of the internal combustion engine radiated through the intake port, in particular for the intake noise of the internal combustion engine. The transducer is an actuator for noise generation,
In particular, it concerns a type having a diaphragm and a drive for this actuator, in particular an electric coil.

[0002]

2. Description of the Related Art Electromechanical transducers of the type described at the outset are usually designed as loudspeakers and generate a correction noise which overlaps with the intake noise, for example in the intake region of an internal combustion engine. Is being used for. This allows the peak of the intake noise to be reduced or varied, which is then interpreted as a correction for the intake noise. An example of such a device that can be used in an intake manifold or exhaust system of an internal combustion engine is described in US Pat.
19902.

A disadvantage of using loudspeakers described above is their sensitivity to dirt. The drive of the electromechanical transducer must therefore be housed in a capsule, which incurs additional costs.
Furthermore, actuators in the form of loudspeaker diaphragms need to be acoustically shielded from the engine room. This is because, for example, only acoustic effects within the system boundaries of the intake manifold of an internal combustion engine are desired. Moreover, shielding adds additional cost,
In addition, it requires a mounting space that is not always used.

[0004]

SUMMARY OF THE INVENTION The object of the invention is to provide a conduit system with an electromechanical transducer for generating noise, which is manufactured inexpensively and requires little installation space. To provide.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the invention, a conduit system for conducting gas, in particular an intake manifold of an internal combustion engine, comprising an intake port. Conduit section is provided, the electromechanical means for generating noise affecting the gas flow in the conduit section, in particular for compensating the intake noise of the internal combustion engine radiated through the intake port. A transducer is provided, the electromechanical transducer comprising an actuator for generating noise, in particular a diaphragm,
In a drive for this actuator, in particular of the type comprising an electric coil, the drive is
By being mounted in the conduit system to be exposed to the gas stream carried in the conduit system; and
A conduit system for conducting gas, in particular an intake manifold of an internal combustion engine, comprising a conduit section with an intake port for purifying gas conveyed through the conduit section. A filter is mounted in the conduit section for generating noise which affects the gas flow in the conduit section, in particular for compensating the intake noise of the internal combustion engine radiated through the intake port. An electromechanical transducer is provided, wherein the electromechanical transducer comprises an actuator, in particular a diaphragm, for generating noise and a drive for this actuator, in particular an electric coil. In one type, the drive is a conduit section,
8. A method for controlling noise generation and at least one desired intake noise by being mounted in the conduit system in communication with the clean side formed by the filter and as claimed in claim 7. The problem is solved by the use of a conduit system provided with means for adapting to the noise.

[0006]

As described above, the feature of the present invention is that the drive of the electromechanical converter is mounted in the conduit system so as to be exposed to the gas stream conveyed in the conduit system. Is to be. According to this configuration, cooling for preventing excessive heating is performed by the conveyed gas flow. Electromechanical transducers are usually loudspeakers, in which case the actuator is a loudspeaker diaphragm, and the drive is provided by an electrical coil containing a coil body. By cooling the above components, the heating and thus the failure of the converter under continuous load is suppressed, so that a relatively small drive device for the loudspeaker can be selected. This advantageously saves not only installation space but also weight. Yet another positive effect is the possibility of using inexpensive loudspeakers.

[0007] Alternatively, the drive can be mounted in the conduit system in communication with the clean side of the conduit section formed by the filter. In this manner, the drive is protected from contamination if the drive is mounted in the conduit system so that the gas to be conveyed is in direct communication with the drive. This is especially so if the drive is directly exposed to the gas stream. The advantage of the arrangement on the clean side is that there is no need to provide a capsule to protect the sensitive drive from dirt. This measure therefore saves installation space, component weight and cost.

[0008] It is of course possible to combine the embodiments of the claims of the type described at the outset with one another, which leads to a combination of advantages. The main advantage of the described device concept results from the fact that no special volume is required for mounting the drive for the electromechanical converter. In that case, it is advantageous that both sides of the diaphragm used, for example a diaphragm which can form a loudspeaker, can communicate with the conduit section of the conduit system and thereby influence the noise emission.
This has a greater effect on noise emission if the structural dimensions of the transducer remain unchanged. This optimization step leads to a further reduction in the required installation space.

If both sides of the diaphragm are used to influence intake noise, another embodiment of the invention provides acoustic tuning through additional passages and / or volumes. In that case, the intended overlap of air vibrations occurring on both sides of the diaphragm is used. This overlap advantageously enhances the emitted vibrations in those frequency ranges that require significant correction by loudspeakers or other transducers and weakens them in other ranges.

When the conduit system is used in an intake manifold of an internal combustion engine, in order to solve the problem of the present invention, in one aspect, noise generation is controlled, and in the other, intake noise is reduced to a desired noise level. Means are provided for adapting. The desired noise need not lead to reduced intake noise. According to the device described above, the noise is brought close to an arbitrary noise characteristic within the framework of the output of the electromechanical transducer. This process is based on sound design (Sou
nd Design). In short, it is shown that the subjective impression of the intake noise depends not only on the absolute noise peak but also on the noise characteristics. However, in many cases, the above-described device facilitates the intended change in intake noise more easily than reducing or eliminating the intake noise. The installation space for uneconomical conventional acoustic means such as resonators or quarter-wave tubes is at least partially saved. Possible structures of the means for control and adaptation are described, for example, in DE 19949.
685.4, specification.

In order to obtain an optimal adaptation of the intake noise, it can be realized, for example, by an electronic control unit.
The means for control and adaptation can include storage for typical driving conditions. This running state can be stored together with the other characteristic areas in the control device and thus forms the characteristic value for the desired noise to be obtained. The storage device can also compensate for changes in the noise characteristics of the internal combustion engine or the intake manifold caused by contamination or aging. As a result, the control device forms a self-learning system, whereby the function of the operating time of the internal combustion engine can advantageously be maintained without restriction.

In particular, if the conduit system is used as an intake manifold for an internal combustion engine, a particularly advantageous installation for the drive of the electromechanical converter takes place in the air filter housing or in the intake pipe. In this case, incorporation takes place on the clean side of the filter and also in the suction air stream, with the already described advantages of avoiding contamination and cooling of the drive.

[0013] These and other features of advantageous embodiments of the invention are derived from the claims and from the description which follows.
It is also evident from the drawings, in which case the individual features are each realized alone or in the form of a sub-combination of a plurality of features in an embodiment of the invention and in other fields advantageous and advantageous It is possible to form advanced embodiments of the invention per se, for which a patent is filed.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 1 schematically shows an internal combustion engine 10. This internal combustion engine has an intake manifold 11 having a throttle valve 12 and an exhaust device 13. The flow directions of the intake and exhaust are indicated by arrows.

One conduit section 2 is located in the intake manifold.
In the region 5, an electromechanical transducer 14, which in this case is formed as a loudspeaker, is mounted. Attached to the suction connection piece 15 is a sensor 16, which in this case is formed as a microphone. In addition, a control device 17 is provided as a means for controlling the noise generation by the actuator 26 of the transducer 14 and for adapting the intake noise to at least one desired noise, which control device receives the sensor 16. The actual noise signal I and the speed signal D received from the internal combustion engine are supplied. The rotation speed signal D is measured by the rotation speed sensor 18, for example. Measurement of the throttle valve angle is also possible with the position sensor 19. The throttle valve angle gives rise to another parameter P, which can likewise be processed by the controller 17.

The control device 17 generates a control signal Ages,
This control signal is converted by the electromechanical converter 14 into corrected noise 20, 20 '. This correction noise overlaps with the intake noise 21 of the internal combustion engine diffused by the intake manifold 11. From this, the actual noise 2
2, the actual noise of which can be measured, for example, by a sensor 16 at the suction connection 15. As a result, an actual noise signal I is generated.

The electromechanical transducer 14 comprises an actuator 26, which in the embodiment shown is formed as a loudspeaker diaphragm, and a drive 27, which is formed by a coil with a core. The drive 27 is a conduit section 25
And is thus loaded by the intake air for cooling. The driving device 2 of the actuator 26
The side of the diaphragm connected to 7 forms part of the wall of the conduit section 25, whereby the diaphragm vibrations are transmitted directly to the intake air as correction noise 20.

Furthermore, the diaphragm side opposite the drive is connected to an additional volume 28, which communicates with a conduit section 25 via an additional conduit 29. Depending on the distance between the opening 30 of the additional conduit 29 into the conduit section 25 and the electromechanical transducer 14, the length of the additional conduit 29 and the size of the additional volume 28, an acoustic tuning is achieved. As a result, the desired overlap of the corrected noise 20 'and the corrected noise 20 supplied to the conduit section 25 by the additional conduit 29 is obtained.

The control device 17 is configured as a digital computer. Therefore, the control signal Ages needs to be converted by the digital-to-analog converter 24 into an analog signal, by means of which the electromechanical converter 14 can be activated. This embodiment represents the most advantageous variation with respect to component costs, manufacturing costs and reliability of the device. However, a configuration of the control device 17 as an analog computer is also conceivable. The signal is correspondingly processed in analog and, if necessary (depending on whether the sensor generates a digital signal or an analog signal), must first be converted to an analog signal. In that case, the control signal Ages provided by the analog control device 17 no longer needs to be converted. In some cases, it is necessary to amplify the control signal Ages. This is optionally performed by the amplifier 23.

A storage device 31 is arranged corresponding to the control device. The storage device serves to store the desired noise depending on the operation, the desired noise being the corrected noise 20,2.
This produces a characteristic range for the occurrence of 0 '. Further, a characteristic value used for a self-learning function of the control device can be stored in the storage device. This allows a rapid response of the control device in the event of a change in operating conditions and an adaptation of the mode of operation of the device to aging-dependent changes in the internal combustion engine 10 and the intake manifold 11.

FIG. 2 shows a filter 32, in a filter casing 34, on the clean side 33 of the filter.
An electromechanical transducer 14 is arranged in the air stream and is protected from dirt. The filter casing is formed as a part of the intake manifold 11. Air flows from the suction connection piece 15 through the filter 32 to the suction pipe (not shown) in the direction of the arrow shown. The electromechanical transducer is mounted in a partition between the suction connection piece and the filter casing, so that both sides of the diaphragm emit the generated noise into the intake manifold.
On the one hand, this radiation takes place directly into the suction connection tubing, where an overlap with the intake port noise is immediately possible. On the other hand, the noise is radiated into the casing volume on the clean side of the air filter. In order to reach the suction connection piece, this air vibration must first pass through the air filter, whereby the damping effect of the filter medium can be used as intended.

FIG. 3 shows an intake pipe 35 provided with a resonance type supercharger. The suction passage 36 starts from two resonance chambers 38 separated by an intermediate wall 37. A resonance flap 39 is arranged in the intermediate wall 37 and can be opened and closed depending on the operating state of the internal combustion engine, not shown. Furthermore, an electromechanical transducer 14 is mounted in the intermediate wall 37, in which case one side of the actuator 26 acts on one resonance chamber 38 in each case.

[Brief description of the drawings]

FIG. 1 is a block diagram of a conduit system according to the invention as an intake pipe of an internal combustion engine.

FIG. 2 is a schematic diagram in which a loudspeaker as an electromechanical transducer is incorporated in a clean side of an air filter.

FIG. 3 is a schematic view in which an electromechanical transducer is incorporated between resonance chambers of a resonance type intake pipe.

[Explanation of symbols]

Reference Signs List 10 internal combustion engine, 11 intake manifold, throttle valve, 13 exhaust system, 14 converter, 15
Suction connection pipe piece, 16 sensor, 17 means for controlling noise generation (control device), 18 rotation speed sensor, 19 position sensor, 20, 20 'correction noise,
21 intake noise, 22 actual noise, 23 amplifier,
24 digital-analog converter, 25 conduit section, 26 actuator, 27 drive, 28
Additional volume, 29 additional conduit, 30 additional conduit opening to conduit section new, 31 storage, 32 filter, 33 clean side, 34 filter casing,
36 suction passage, 37 intermediate wall, 38 resonance chamber, 3
9 resonance flap

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Frank Pricken Freiberg a. N. Grossingersheimer Werk 2/1

Claims (8)

[Claims] A conduit system for conducting gas;
In particular, an intake manifold of an internal combustion engine, comprising: a conduit section (25) with an intake port;-noise affecting the gas flow in the conduit section, in particular internal combustion radiated through the intake port. An electromechanical transducer (14) is provided for generating noise for correcting the intake air noise of the engine, the electromechanical transducer comprising an actuator (26) for generating noise, in particular In the form comprising a diaphragm and a drive (27) for this actuator, in particular an electric coil (32), said drive being exposed to a gas stream carried in a conduit system. And a conduit system having an electromechanical transducer for generating corrected noise, the conduit system being mounted within the conduit system. 2. A conduit system for conducting gas,
In particular, an intake manifold of an internal combustion engine, comprising: a conduit section (25) with an intake port; and a filter (32) for purifying gas conveyed through the conduit section being provided in the conduit section (25). -An electromechanical conversion for generating noise affecting the gas flow in the conduit section, in particular for compensating intake noise of the internal combustion engine radiated through the intake port; A device (14) is provided, in which case the electromechanical transducer comprises an actuator (26) for generating noise, in particular a diaphragm, and a drive (27) for this actuator, in particular an electric coil. (32) wherein the drive communicates with the clean side (33) of the conduit section formed by the filter (32). A conduit system with an electromechanical transducer for generating corrected noise, wherein the conduit system is mounted within the conduit system. 3. A drive is mounted in a filter casing (34) for said filter (32).
The conduit system according to claim 1. 4. The conduit system according to claim 1, wherein the drive is mounted in an intake pipe of the internal combustion engine. 5. The conduit system according to claim 1, wherein the actuator comprises a diaphragm, and both sides of the diaphragm communicate with a conduit section. 6. The method according to claim 1, wherein the electromechanical transducer communicates with the conduit section via an acoustically tuned additional conduit (29) and / or an additional volume (28). A conduit system according to claim 1. 7. A device according to claim 1, further comprising means for controlling noise generation by the actuator and adapting the intake noise to at least one desired noise. Use of the conduit system according to claim 1. 8. The conduit according to claim 7, wherein said means for controlling and adapting comprises a storage device for an operating state of the electromechanical transducer detected during operation. Use of the system.