CN111749754A - Sound quality adjusting device and method for exhaust system - Google Patents
Sound quality adjusting device and method for exhaust system Download PDFInfo
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- CN111749754A CN111749754A CN201910239904.2A CN201910239904A CN111749754A CN 111749754 A CN111749754 A CN 111749754A CN 201910239904 A CN201910239904 A CN 201910239904A CN 111749754 A CN111749754 A CN 111749754A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
- F01N1/20—Silencing apparatus characterised by method of silencing by using movable parts having oscillating or vibrating movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention provides an acoustic quality adjusting device of an exhaust system, which comprises a sounding shell, a connecting pipe and a vibrating device, wherein the sounding shell is arranged on a tail pipe, the sounding shell comprises an accommodating cavity, the connecting pipe is used for connecting the sounding shell and the tail pipe, the vibrating device moves up and down in the accommodating cavity, the vibrating device comprises a vibrating plate capable of moving up and down and vibrating and an adjusting plate telescopically arranged at the same side and opposite ends of the vibrating plate, the vibrating plate is close to the top end of the sounding shell, the tail end of the adjusting plate abuts against the bottom of the sounding shell, and the vibrating plate, the adjusting plate. The invention also relates to a sound quality adjusting device and method for the exhaust system, which can timely and accurately control and adjust the vibration frequency of the vibration cavity by controlling the vibration and the up-and-down movement of the vibration plate, realize the functions of sound compensation and noise elimination, improve the sound quality of the exhaust system, and solve the problems of sudden drop of sound pressure, insufficient pleasure and the like when the exhaust noise of the fuel vehicle rises along with the rotation speed of the engine.
Description
Technical Field
The invention relates to the field of vehicle bodies, in particular to a device and a method for adjusting sound quality of an exhaust system.
Background
With the improvement of living standard of people, the requirements of people on the whole vehicle are changed from the original tools for riding instead of walk to comfortable household necessities, so that the requirements on the sound quality of the whole vehicle are also improved besides the stricter requirements on the dynamic property of the vehicle type, and the optimization of the noise of the whole vehicle in the running and accelerating processes is particularly important. The exhaust system is an important component of the automobile, and combustion noise is brought to the tail of the automobile while exhaust gas is exhausted, so that order noise and friction noise with high sound pressure level can be generated at the tail of the automobile, the noise is transmitted to the passenger cabin, and the resonance of the sound cavity of the passenger cabin caused by the mode of the sound cavity of the passenger cabin is possibly excited, so that the NVH of the whole automobile is seriously influenced.
At present, most vehicle models are not provided with an exhaust system sound quality adjusting device, and even though some vehicle models are provided with electromagnetic valves, the electromagnetic valves mainly reduce back pressure and flow noise and cannot compensate sound loss under certain rotating speeds; some vehicle models use front end exhaust pulsation as excitation to compensate exhaust sound by resonance of a resonant cavity, but the sound quality compensation device can only compensate sound at a rotating speed or frequency, cannot change along with the change of the rotating speed or the frequency to compensate sound of different frequencies, and cannot adjust the amplitude of the sound, so that the sound quality adjustment is limited.
Disclosure of Invention
Accordingly, there is a need for an exhaust system sound quality adjusting apparatus and method that can improve the noise quality of the entire vehicle.
The invention provides an acoustic quality adjusting device of an exhaust system, which comprises a sounding shell, a connecting pipe and a vibrating device, wherein the sounding shell is arranged on an exhaust tail pipe, the sounding shell internally comprises a containing cavity, the connecting pipe is used for connecting the sounding shell and the exhaust tail pipe, the vibrating device moves up and down in the containing cavity, the vibrating device comprises a vibrating plate capable of moving up and down and vibrating and an adjusting plate telescopically arranged at the same side and opposite ends of the vibrating plate, the vibrating plate is close to the top end of the sounding shell, the tail end of the adjusting plate is fixedly connected with the bottom of the sounding shell, and the vibrating plate, the adjusting plate and the inner wall of the sounding.
Further, when the vibrating plate moves up and down, the adjusting plate is driven to stretch up and down, so that the vibration frequency of the resonant cavity is changed; the vibration plate drives the resonant cavity to vibrate when vibrating.
Further, the sound shell includes first casing and second casing, first casing includes first open end and first closed end, the second casing includes second open end and second closed end, first open end assemble in the second open end, and with first closed end the second closed end forms the confined together hold the chamber.
Furthermore, the vibrating plate is close to the second closed end, and the adjusting plate is a bent vibrating reed, and the tail end of the adjusting plate is fixedly connected to the first closed end.
Further, in the initial state, the vibration plate abuts against the inner surface of the second closed end.
Furthermore, a first through hole is formed in the first closed end, one end of the connecting pipe penetrates through the first through hole and is fixedly connected to the inner wall of the first through hole, and the other end of the connecting pipe is connected to the tail pipe.
Furthermore, a second through hole is formed in the second closed end, and the exhaust system sound quality adjusting device further comprises a push rod welded on the vibration plate and penetrating through the second through hole, and a controller for controlling the push rod to move up and down and vibrate.
Further, the mounting hole that is equipped with on the controller, the push rod cup joint in the mounting hole, the bottom rigid coupling of controller in second blind end on the second casing.
Furthermore, the controller is a vibration excitation controller which can control the push rod to move up and down and vibrate in the second through hole according to a frequency control signal corresponding to the noise frequency and the vibration amplitude transmitted by the ECU.
The invention also provides an exhaust system sound quality adjusting method, which comprises the following steps of adjusting the sound quality of the tail pipe by using the exhaust system sound quality adjusting device:
the ECU judges whether the tail pipe needs sound compensation according to the noise frequency and the amplitude under the rotating speed;
when the ECU judges that the tail pipe does not need sound compensation, the resonant cavity and the connecting pipe form a silencer, and the controller controls the vibrating plate to move up and down according to a silencing frequency command signal obtained by the ECU analysis, so that the silencing frequency of the resonant cavity is changed;
when the ECU judges that the tail pipe needs sound compensation, the ECU transmits a control signal corresponding to the target frequency and the target amplitude of the sound compensation to the controller, the controller controls the push rod to move the vibration plate to a specific position according to the control signal, the vibration frequency of the resonant cavity is adjusted to a first frequency, the controller further controls the push rod to drive the vibration plate to vibrate at the first frequency according to the control signal, the resonant cavity resonates and produces sound, and the sound is transmitted to the tail pipe through the connecting pipe to complete the sound compensation. .
In summary, the sound producing housing including the containing cavity inside is connected to the tail pipe through the connecting pipe, the vibrating plate capable of vibrating and moving up and down and the adjusting plate capable of stretching up and down along with the vibrating plate are arranged inside the containing cavity, and meanwhile, the vibration frequency of the vibrating cavity is timely and accurately adjusted by controlling the vibrating and moving up and down of the vibrating plate, so that the functions of sound compensation and sound elimination are realized, and the sound quality of the exhaust system is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an apparatus and method for adjusting the acoustic quality of an exhaust system according to the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along the line A-A in FIG. 2;
FIG. 4 is a schematic view of a first closed end of the first housing of the sound outputting housing of FIG. 1;
FIG. 5 is a schematic view of a second closed end of the second housing of the sound outputting housing of FIG. 1;
FIG. 6 is a schematic structural diagram of the vibration device and a push rod for pushing the vibration device to move up and down in FIG. 1;
fig. 7 is a schematic structural view of a controller for controlling the up-and-down movement and vibration of the push rod of fig. 1.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1 to 7, the present invention provides an acoustic quality adjusting apparatus for an exhaust system, which includes a sounding housing 10 mounted on a tail pipe 20 and including a receiving cavity 100 therein, a connecting pipe 30 connecting the sounding housing 10 and the tail pipe 20, and a vibration device 40 (refer to fig. 1, 2, and 3 with emphasis on) moving up and down in the receiving cavity 100 to adjust an amplitude of an output sound pressure transmitted to the tail pipe 20.
The vibrating device 40 includes a vibrating plate 41 capable of moving up and down (sliding back and forth up and down) and vibrating, and an adjusting plate 42 telescopically disposed at the same side and opposite end of the vibrating plate 41, the vibrating plate 41 is close to the top end of the sound-generating housing 10, the end of the adjusting plate 42 is fixedly connected to the bottom of the sound-generating housing 10, the vibrating plate 41, the adjusting plate 42 and the inner wall of the sound-generating housing 10 together form a resonant cavity 400, and the smooth change of the vibration frequency of the resonant cavity 400 is ensured. In a preferred embodiment, the adjusting plate 42 is fixedly connected to the vibrating plate 41 by welding, riveting, or the like.
When the tail pipe 20 does not need sound compensation, the adjusting plate 42 is driven to synchronously stretch up and down by the up-and-down movement of the vibrating plate 41, so that the vibration frequency of the resonant cavity 400 is changed to change the noise elimination frequency, and further, the noise is reduced or eliminated; when the tail pipe 20 needs sound compensation, the vibration frequency of the resonant cavity 400 is changed and maintained according to the noise frequency, and the vibration of the vibration plate 41 is weak relative to the up-down movement of the vibration plate 41, so that the vibration of the vibration plate 41 is further controlled to cause the resonance of the resonant cavity 400 to generate sound, and the sound compensation of the tail pipe 20 is realized.
Specifically, referring to fig. 4 and 5 together, the sounding case 10 includes a first case 11 and a second case 12, the first case 11 includes a first open end and a first closed end 11a, the second case 12 includes a second open end and a second closed end 12a, and the first open end is assembled with the second open end and forms a closed accommodating chamber 100 together with the first closed end 11a and the second closed end 12 a. In a preferred embodiment, the first housing 11 and the second housing 12 are square box-shaped structures, and the first housing 11 is a bottom cover welded to the second open end of the second housing 12.
In the present invention, the first closed end 11a is provided with a first through hole 111, one end of the connection pipe 30 passes through the first through hole 111 and is fixedly connected to the inner wall of the first through hole 111, and the other end is connected to the tail pipe 20.
The second closed end 12a is provided with a second through hole 112; correspondingly, as shown in fig. 3, 6 and 7, the exhaust system sound quality adjusting device further includes a push rod 51 welded to the vibration plate 41 and passing through the second through hole 112, and a controller 52 for controlling the push rod 51 to move up and down and vibrate, the controller 52 controls the push rod 51 to move up and down and vibrate to drive the vibration plate 41 to move up and down and vibrate (the controller 52 controls the push rod 51 to move up and down to drive the vibration plate 41 to move up and down, and the controller 52 controls the push rod 51 to vibrate to drive the vibration plate 41 to vibrate), so as to drive the resonance of the resonant cavity 400, which is accurate in control and timely in response. In a preferred embodiment, the push rod 51 is a cylindrical solid rod and is located at the center of the vibration plate 41, and the controller 52 is a vibration exciting controller capable of controlling the push rod 51 to move up and down and vibrate in the second through hole 112 according to a frequency control signal corresponding to the noise frequency and the vibration amplitude transmitted by the ECU.
Furthermore, the controller 52 provided by the present invention is provided with a mounting hole 52a, the push rod 51 is sleeved in the mounting hole 52a, and the bottom end of the controller 52 is fixedly connected (welded) to the second closed end 12a of the second housing 12.
In the invention, the vibrating plate 41 is close to the second closed end 12a, the adjusting plate 42 is a bent vibrating reed, the tail end of the adjusting plate is fixedly connected (welded) to the first closed end 11a, and the volume of the resonant cavity 400 is changed and the vibration frequency of the resonant cavity 400 is adjusted under the action of the telescopic vibrating reed and the vibrating plate 41 capable of vibrating and moving up and down, so that the volume change is fast, the efficiency is high, the sound adjustment and the excitation of the resonant cavity 400 are facilitated, and the noise quality of the whole vehicle is improved.
In a preferred embodiment of the present invention, in an initial state when the vibration device 40 formed by the vibration plate 41 and the adjustment plate 42 is mounted on the sound-emitting housing 10, the upper surface of the vibration plate 41 abuts against the inner surface of the second closed end 12a, and the height of the vibration device 40 is slightly greater than or just equal to the height of the accommodating cavity 100 in the sound-emitting housing 10, so that the adjustable vibration frequency range of the resonant cavity 400 is maximized. Naturally, in other embodiments, the relative position of the vibration plate 41 and the second closed end 12a can be adjusted as needed.
According to the invention, the controller 52 controls the up-and-down movement and vibration of the push rod 51 to drive the vibration plate 41 to move up and down and vibrate, so as to drive the adjusting plate 42 to extend and retract up and down along with the vibration plate 41, thereby achieving the purposes of changing the volume of the resonant cavity 400 and changing the vibration frequency of the resonant cavity 400. Specifically, the push rod 51 moves downward, the vibration plate 41 moves downward, the adjustment plate 42 compresses downward, and the vibration frequency of the resonance chamber 100 becomes small; the push rod 51 moves upward, the vibration plate 41 moves upward, the adjustment plate 42 extends upward, and the vibration frequency of the resonance chamber 400 becomes larger, that is, the frequency of the resonance chamber 400 is inversely proportional to the volume.
The invention also provides an exhaust system sound quality adjusting method, which comprises a method for adjusting the sound quality of the tail pipe 20 by using the exhaust system sound quality adjusting device, and the method comprises the following steps:
the ECU judges whether the tail pipe 20 needs sound compensation according to the noise frequency and the amplitude under the rotating speed;
when the ECU judges that the tail pipe 20 does not need sound compensation, the resonance cavity 400 and the connection pipe 30 form a silencer, and the controller 52 controls the vibration plate 41 to move up and down according to a silencing frequency command signal obtained by the ECU analysis, so as to change the silencing frequency of the resonance cavity 400, thereby reducing the noise under a specific frequency;
when the ECU determines that the tail pipe 20 needs sound compensation, the ECU transmits a control signal corresponding to a target frequency and a target amplitude of the sound compensation to the controller 52, the controller 52 controls the push rod 51 to move the vibration plate 41 up and down to a specific position according to the control signal (at this time, the adjustment plate 42 is compressed to the specific position to ensure that the volume of the resonance cavity 400 is not changed), so as to adjust (change) the vibration frequency of the resonance cavity 400 to a first frequency, and the controller 52 further controls the push rod 51 to vibrate according to the control signal, so as to drive the vibration plate 41 to vibrate at the first frequency, at this time, the resonance cavity 400 resonates and generates sound, and the sound is transmitted to the tail pipe 20 through the connection pipe 30, thereby completing the.
The sound pressure amplitude output to the tail pipe by the exhaust system sound quality adjusting device provided by the invention is adjustable, and the sound frequency and amplitude needing to be compensated can be adjusted timely according to the change of the rotating speed and the noise frequency, so that the noise under each rotating speed and noise frequency can be compensated better, and the working frequency range of the exhaust system sound quality adjusting device is greatly enlarged; when the sound compensation is not needed, the mode of the resonant cavity 400 (sound cavity) is adjusted, and the resonant cavity is changed into a silencer without applying vibration excitation, so that the noise of specific frequency is reduced.
The device and the method for adjusting the sound quality of the exhaust system are used for solving the problems that the sound pressure suddenly drops and is not pleasant enough when the exhaust noise of a fuel vehicle rises along with the rotating speed of an engine, improving the sound quality of the exhaust system and providing better exhaust sound for the whole vehicle.
In summary, the sound producing housing including the containing cavity therein is connected to the tail pipe through the connecting pipe, the vibrating plate capable of vibrating and moving up and down and the adjusting plate capable of stretching up and down along with the vibrating plate are arranged in the containing cavity, and the controller controls the up-and-down movement and the vibration of the push rod fixedly connected with the vibrating plate, so as to control the vibration and the up-and-down movement of the vibrating plate, and timely and accurately adjust the vibration frequency of the vibrating cavity, thereby realizing the functions of sound compensation and sound elimination, and improving the sound quality of the exhaust system.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an exhaust system sound quality adjusting device, its characterized in that, including install on tail pipe (20) and inside including sound production casing (10), the connection that holds chamber (100) sound production casing (10) with connecting pipe (30) of tail pipe (20) and hold up vibration device (40) of up-and-down motion in chamber (100), vibration device (40) including vibration board (41) that can reciprocate and vibrate and telescopically locate adjustment plate (42) of vibration board (41) homonymy opposite end, vibration board (41) are close to the top of sound production casing (10), the terminal rigid coupling of adjustment plate (42) in the bottom of sound production casing (10), vibration board (41) adjustment plate (42) reach the inner wall of sound production casing (10) forms resonant cavity (400) jointly.
2. The exhaust system sound quality adjusting apparatus according to claim 1, wherein the vibration plate (41) moves up and down to drive the adjusting plate (42) to extend and contract up and down, so as to change the vibration frequency of the resonant cavity (400); when the vibrating plate (41) vibrates, the resonant cavity (400) is driven to vibrate.
3. The exhaust system sound quality adjusting apparatus according to claim 1, wherein the sound generating casing (10) includes a first casing (11) and a second casing (12), the first casing (11) includes a first open end and a first closed end (11a), the second casing (12) includes a second open end and a second closed end (12a), the first open end is assembled to the second open end, and forms the closed containing chamber (100) together with the first closed end (11a) and the second closed end (12 a).
4. The exhaust system sound quality adjusting apparatus according to claim 3, wherein the vibration plate (41) is adjacent to the second closed end (12a), and the adjusting plate (42) is a bent vibration reed and has a tip end fixed to the first closed end (11 a).
5. The exhaust system acoustic quality adjustment apparatus according to claim 4, wherein in an initial state, the vibration plate (41) abuts against an inner surface of the second closed end (12 a).
6. The acoustic quality control apparatus for an exhaust system according to claim 3, wherein the first closed end (11a) is provided with a first through hole (111), one end of the connection pipe (30) passes through the first through hole (111) and is fixedly connected to an inner wall of the first through hole (111), and the other end is connected to the tail pipe (20).
7. The exhaust system sound quality adjusting apparatus according to claim 6, wherein a second through hole (112) is provided in the second closed end (12a), and the exhaust system sound quality adjusting apparatus further comprises a push rod (51) welded to the vibration plate (41) and passing through the second through hole (112), and a controller (52) controlling the push rod (51) to move up and down and vibrate.
8. The exhaust system sound quality adjusting device according to claim 7, characterized in that the controller (52) is provided with a mounting hole (52a), the push rod (51) is sleeved in the mounting hole (52a), and the bottom end of the controller (52) is fixedly connected to the second closed end (12a) of the second housing (12).
9. The exhaust system sound quality adjusting apparatus according to claim 7 or 8, wherein the controller (52) is a vibration exciting controller capable of controlling the push rod (51) to move up and down and vibrate in the second through hole (112) according to a frequency control signal corresponding to a noise frequency and a vibration amplitude transmitted from the ECU.
10. An exhaust system acoustic quality adjusting method, comprising a method of adjusting an acoustic quality of a tail pipe (20) with an exhaust system acoustic quality adjusting device:
the ECU judges whether the tail pipe (20) needs sound compensation according to the noise frequency and the amplitude under the rotating speed;
when the ECU judges that the tail pipe (20) does not need sound compensation, the resonant cavity (400) and the connecting pipe (30) form a silencer, and the controller (52) controls the vibration plate (41) to move up and down according to a silencing frequency command signal obtained by ECU analysis, so that the silencing frequency of the resonant cavity (400) is changed;
when the ECU judges that the tail pipe (20) needs sound compensation, the ECU transmits a control signal corresponding to the target frequency and the target amplitude of the sound compensation to the controller (52), the controller (52) controls the push rod (51) to move the vibration plate (41) up and down to a specific position according to the control signal, the vibration frequency of the resonant cavity (400) is adjusted to a first frequency, the controller (52) further controls the push rod (51) to drive the vibration plate (41) to vibrate at the first frequency according to the control signal, the resonant cavity (400) resonates and produces sound, the sound is transmitted to the tail pipe (20) through the connecting pipe (30), and the sound compensation is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910239904.2A CN111749754B (en) | 2019-03-27 | 2019-03-27 | Exhaust system sound quality adjusting device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910239904.2A CN111749754B (en) | 2019-03-27 | 2019-03-27 | Exhaust system sound quality adjusting device and method |
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| CN111749754A true CN111749754A (en) | 2020-10-09 |
| CN111749754B CN111749754B (en) | 2023-08-15 |
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| CN111828129A (en) * | 2019-04-15 | 2020-10-27 | 广州汽车集团股份有限公司 | Exhaust noise adjusting device and method, exhaust noise adjusting system and vehicle |
| CN113183750A (en) * | 2021-04-29 | 2021-07-30 | 东风汽车集团股份有限公司 | Structure for sounding by using automobile exhaust, control method thereof and exhaust system tail pipe |
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| CN113183750A (en) * | 2021-04-29 | 2021-07-30 | 东风汽车集团股份有限公司 | Structure for sounding by using automobile exhaust, control method thereof and exhaust system tail pipe |
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| Publication number | Publication date |
|---|---|
| CN111749754B (en) | 2023-08-15 |
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