CN113724681A

CN113724681A - Active silencing method and system

Info

Publication number: CN113724681A
Application number: CN202110944278.4A
Authority: CN
Inventors: 王洋; 黄进; 王飞跃; 胡旋; 邓湘
Original assignee: Lantu Automobile Technology Co Ltd
Current assignee: Lantu Automobile Technology Co Ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2021-11-30
Anticipated expiration: 2041-08-17
Also published as: CN113724681B

Abstract

The application relates to an active silencing method and system, relating to the technical field of automobile silencing, wherein the method comprises the following steps: the method comprises the steps of obtaining a plurality of noise audio signals to be silenced in advance, and taking a gear and an engine rotating speed interval corresponding to each noise audio signal as a section to be silenced; after the vehicle is powered on, the gear and the engine speed of the vehicle are obtained, and when the gear and the engine speed are in any section to be silenced, the loudspeaker device is controlled to send out audio with the opposite phase of a corresponding noise audio signal of the section to be silenced. The system comprises: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the gear and the engine speed of the vehicle after the vehicle is powered on; the silencing controller prestores all to-be-silenced intervals and is used for sending a control instruction to the loudspeaker device when the gear and the engine rotating speed are in any to-be-silenced interval; the loudspeaker device is used for sending out audio to perform noise cancellation based on the control instruction. The active noise reduction method and the active noise reduction system can achieve real-time noise cancellation and provide good driving experience for users.

Description

Active silencing method and system

Technical Field

The application relates to the technical field of automobile silencing, in particular to an active silencing method and system.

Background

Currently, vehicle mufflers come in a variety of forms, including resistive, and hybrid resistive mufflers. The impedance hybrid muffler is usually adopted and comprises a shell and an inner muffling component, wherein the shell of the muffler comprises a cylinder body and front and rear end covers or upper and lower clam shells, and the inner muffling component of the muffler comprises a partition plate, a muffling material, an inner insert tube and a quarter-wave tube.

In the related art, with the competitive automobile market, each large host factory has increasingly strict NVH (Noise, Vibration, and Harshness) targets.

However, for new energy vehicles such as PHEVs (Plug in Hybrid Electric vehicles), HEVs (Hybrid Electric vehicles), REVs (Range Electric vehicles), and the like, the layout is compact, so that the layout space left for the silencer is limited, the silencing volume often cannot meet the noise of the frequency of the target part of NVH, bad experience is brought to users, the market competitiveness of the vehicles after the vehicles are on the market is not strong, the sales cycle is affected, and meanwhile, the word of the brand at the users is damaged.

Disclosure of Invention

Aiming at the defects in the prior art, the application aims to provide an active silencing method and system to solve the problem that the layout space of a silencer is limited due to the compact layout of new energy vehicles in the related art, so that the silencing volume cannot meet the NVH target.

A first aspect of the present application provides an active silencing method, comprising:

the method comprises the steps of obtaining a plurality of noise audio signals to be silenced in advance, and taking a gear and an engine rotating speed interval corresponding to each noise audio signal as a section to be silenced;

after the vehicle is powered on, the gear and the engine speed of the vehicle are obtained, and when the gear and the engine speed are in any section to be silenced, the loudspeaker device is controlled to send out audio with the phase opposite to that of a noise audio signal corresponding to the section to be silenced, so that noise cancellation is carried out.

In some embodiments, after obtaining the plurality of noise audio signals to be muted, the method further includes:

and acquiring audio with the phase opposite to that of the noise audio signal and storing the audio in the loudspeaker device.

In some embodiments, the speaker device includes a recorder and a speaker connected to the recorder, and the recorder stores therein audio in a phase opposite to the noise audio signal.

In some embodiments, the obtaining a plurality of noise audio signals to be muted in advance specifically includes:

starting the engine under different working conditions in sequence, and recording process noise;

and extracting audio signals which cannot be eliminated through an in-vehicle silencer in the process of noise to serve as the noise audio signals to be silenced, and acquiring a gear and an engine rotating speed interval corresponding to each noise audio signal.

In some embodiments, the audio signals of the process noise that cannot be cancelled by the in-vehicle microphone are: an audio signal of noise having a noise sound pressure level greater than a noise sound pressure level threshold.

In some embodiments, when the process noise is recorded, the method further includes:

recording the emission positions of the noise audio signals, and determining the primary and secondary relations between the emission positions;

the emitting position comprises at least one of a front wall position, a front silencer position and a rear silencer position, and a loudspeaker device is respectively arranged at the position adjacent to the front wall position, the position adjacent to the front silencer position and the position adjacent to the rear silencer position.

In some embodiments, when the gear and the engine speed are not in the section to be silenced, the loudspeaker device is controlled not to work.

The second aspect of the present application provides an active silencing system based on the above method, which includes:

the acquisition module is used for acquiring the gear and the engine speed of the vehicle after the vehicle is powered on and sending the gear and the engine speed to the silencing controller;

the silencing controller prestores all to-be-silenced intervals and is used for sending a control instruction to the loudspeaker device when the gear and the engine rotating speed are in any to-be-silenced interval;

the loudspeaker device is used for sending out the audio with the phase opposite to the phase of the noise audio signal corresponding to the section to be silenced for noise cancellation based on the control instruction.

In some embodiments, the system further includes a recording module, and the recording module is configured to acquire an audio signal with a phase opposite to that of the noise audio signal, and record the audio signal into the speaker device.

In some embodiments, the above-described noise reduction controller includes:

the storage submodule is used for storing all the sections to be silenced;

the judging submodule is used for judging whether the received gear and the engine rotating speed are in any section to be silenced;

and the control submodule is used for sending a control instruction to the loudspeaker device when the judgment submodule judges that the loudspeaker device is yes.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides an active silencing method and system, wherein a plurality of noise audio signals to be silenced are obtained in advance, and a gear and an engine rotating speed interval corresponding to each noise audio signal are respectively used as a to-be-silenced interval; after a vehicle is powered on, acquiring a gear and an engine rotating speed of the vehicle, judging whether the gear and the engine rotating speed are in a certain section to be silenced, and controlling a loudspeaker device to send out audio with a phase opposite to a noise audio signal corresponding to the section to be silenced to perform noise cancellation when the gear and the engine rotating speed are judged to be in any section to be silenced; in this application, based on the sound wave principle of offsetting each other, select and wait that the sound frequency that the interval corresponds the opposite phase place of noise audio signal of amortization carries out real-time noise and offsets, can avoid leading to the problem that can't satisfy NVH development target inadequately because of the amortization volume in the car, still can bring good driving experience for the user simultaneously.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of an active silencing method in an embodiment of the present application;

fig. 2 is a schematic layout of an active silencing system in an embodiment of the present application.

Reference numerals:

1. an acquisition module; 2. a noise reduction controller; 3. a first recorder; 4. a first speaker; 5. a second recorder; 6. a second speaker; 7. a third recorder; 8. a third speaker.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment of the application provides an active silencing method, which can solve the problem that in the related art, the layout of a new energy vehicle type is compact, so that the layout space of a silencer is limited, and the silencing volume cannot meet the NVH target.

As shown in fig. 1, the active silencing method in the embodiment of the present application specifically includes the following steps:

s10, acquiring a plurality of noise audio signals to be silenced in advance, and taking a gear and an engine rotating speed interval corresponding to each noise audio signal as a section to be silenced.

S20, after the vehicle is powered on, the gear and the engine rotating speed of the vehicle are obtained, and when the gear and the engine rotating speed are in any section to be silenced, the loudspeaker device is controlled to send out audio with the phase opposite to that of the noise audio signal corresponding to the section to be silenced, so that noise cancellation is carried out.

According to the active silencing method, a plurality of noise audio signals to be silenced are obtained in advance, and a gear and an engine rotating speed interval corresponding to each noise audio signal are respectively used as a section to be silenced; after a vehicle is powered on, acquiring a gear and an engine rotating speed of the vehicle, judging whether the gear and the engine rotating speed are in a certain section to be silenced, and controlling a loudspeaker device to send out audio with a phase opposite to a noise audio signal corresponding to the section to be silenced to perform noise cancellation when the gear and the engine rotating speed are judged to be in any section to be silenced; the active silencing method is based on the principle that sound waves offset each other, and selects the audio frequency with the phase opposite to the phase of the corresponding noise audio signal in the section to be silenced to offset the noise in real time, so that the problem that the NVH development target cannot be met due to insufficient silencing volume in a vehicle can be avoided, and meanwhile, good driving experience can be brought to a user.

On the basis of the above embodiment, in this embodiment, after acquiring a plurality of noise audio signals to be muted in the above step S10, the method further includes the following steps:

In this embodiment, after acquiring a plurality of noise audio signals to be muted, an audio wave with a phase opposite to that of the noise audio signal to be muted may be recorded and stored in the speaker device, so that in a subsequent actual driving process, sound wave cancellation is performed through the recorded audio wave and noise.

Further, the speaker device includes a recorder and a speaker, the recorder is connected to the speaker, and the recorder stores therein an audio signal having a phase opposite to that of the noise audio signal.

In this embodiment, the recorder uses a hard magnetic material as a carrier, and records the sound signal in the carrier by using the remanence property of the magnetic material. Specifically, when the speaker needs to emit audio with a phase opposite to that of the noise audio signal corresponding to the section to be silenced, the recorder amplifies the generated audio current and sends the amplified audio current to the speaker, and the speaker restores the audio current into audio for playing so as to cancel the current noise.

On the basis of the foregoing embodiment, in this embodiment, the step S10 of obtaining a plurality of noise audio signals to be muted in advance specifically includes the following steps:

first, the engine is started sequentially at different operating conditions and process noise is recorded.

The different working conditions include idle speed and AC ON (air condition ON) working conditions, idle speed and AC OFF (air condition OFF) working conditions, acceleration working conditions and the like of the vehicle.

In the embodiment, the process noise is recorded through the microphone during the previous tuning, specifically, the engine is started under the working condition of vehicle idling and AC ON, and the first process noise is recorded through the microphone; starting the engine under the working condition that the vehicle is idling and AC OFF, and recording second process noise through a microphone; the engine is started in the acceleration mode, and the third process noise is recorded through the microphone. Optionally, the acceleration condition is a full throttle acceleration condition.

And then, extracting audio signals which cannot be eliminated through an in-vehicle silencer in the process noise to serve as noise audio signals to be silenced, and acquiring a gear and an engine rotating speed interval corresponding to each noise audio signal to serve as the interval to be silenced corresponding to each noise audio signal.

In this embodiment, audio signals that cannot be eliminated by the in-vehicle muffler in the first process noise, the second process noise, and the third process noise are sequentially extracted as noise audio signals to be silenced.

In this embodiment, the audio signals that cannot be eliminated by the in-vehicle muffler in the process noise are: an audio signal of noise having a noise sound pressure level greater than a noise sound pressure level threshold.

Namely, the audio signal which cannot be eliminated by the in-vehicle silencer in the process of extracting the noise specifically comprises the following steps:

and in the process of extracting the noise, the audio signal of the noise with the noise sound pressure level larger than the noise sound pressure level threshold value is taken as the audio signal which can not be eliminated by the silencer in the vehicle.

Therefore, a noise sound pressure level threshold needs to be preset before extracting an audio signal that cannot be eliminated by the in-vehicle muffler in the noise during the process. In this embodiment, the noise sound pressure level threshold may be set according to actual conditions or NVH development targets. That is, in the process noise, if the noise sound pressure level of a certain noise is greater than the noise sound pressure level threshold, the audio signal of the certain noise is a noise audio signal to be muted, and active cancellation needs to be performed through the speaker device.

In addition to the above embodiments, in this embodiment, when the shift position and the engine speed are not in the sound deadening region, the speaker device is controlled not to operate. When the gear and the engine speed are not in the section to be silenced, the current noise is not generated or can be eliminated by an in-vehicle silencer, and the noise is not eliminated through a loudspeaker device.

On the basis of the above embodiment, in this embodiment, when recording the process noise, the method further includes the following steps:

the emission positions of the noise audio signals are recorded, and the primary and secondary relationships between the emission positions are determined.

The said emitting position includes at least one of the front wall, the front silencer and the back silencer, and there are loudspeaker units set near the front wall, the front silencer and the back silencer separately.

In this embodiment, the speaker devices include a first speaker device, a second speaker device, and a third speaker device.

The first speaker device is disposed near the front wall, and the first speaker device stores an audio frequency with a phase opposite to a noise audio signal emitted from the front wall.

The second speaker device is disposed in the vicinity of the pre-silencer, and stores therein an audio signal having a phase opposite to that of the noise audio signal emitted from the pre-silencer.

The third speaker device is disposed near the rear muffler, and the third speaker device stores therein an audio having a phase opposite to that of a noise audio signal emitted from the rear muffler.

In this embodiment, the step S10 specifically includes the following steps:

s11, starting the engine under different working conditions in sequence, and recording process noise through a microphone;

s12, extracting audio signals which cannot be eliminated through a silencer in the process noise through sound processing to serve as noise audio signals to be silenced, and simultaneously recording gears and engine rotating speed intervals corresponding to the noise audio signals to serve as intervals to be silenced;

and S13, storing the primary and secondary relations between the section to be silenced corresponding to each noise audio signal and the sending position of the noise audio signal in a silencing controller.

And S14, recording the audio with the phase opposite to that of the noise audio signal and storing the audio in the loudspeaker device.

In the embodiment, the gear and the engine speed interval corresponding to each noise audio signal are calibrated at the early stage to serve as the to-be-silenced interval corresponding to each noise audio signal, and then the to-be-silenced interval information is stored, so that after the vehicle is powered on at the later stage, the gear and the engine speed of the vehicle CAN be obtained according to the CAN bus to judge in real time, and whether the current gear and the engine speed are in the to-be-silenced interval corresponding to the audio signal which cannot be eliminated through an in-vehicle silencer or not is judged; when the current gear and the engine rotating speed are in any section to be silenced, the loudspeaker device is controlled to send out audio with the opposite phase of the corresponding noise audio signal of the section to be silenced, and noise cancellation is carried out. And if the current gear and the engine rotating speed are not in any section to be silenced, controlling the loudspeaker device to stop sounding.

The embodiment of the present application further provides an active silencing system based on the above method, where the active silencing system includes: the device comprises an acquisition module, a silencing controller and a loudspeaker device.

The acquisition module is used for acquiring the gear and the engine speed of the vehicle after the vehicle is powered on and sending the gear and the engine speed to the silencing controller.

The silencing controller is prestored with all the to-be-silenced sections and used for sending a control command to the loudspeaker device when the gear and the engine rotating speed are in any to-be-silenced section.

Optionally, the speakers include a first speaker, a second speaker and a third speaker, the first speaker is disposed at the front wall, the second speaker is disposed at the front silencer, and the third speaker is disposed at the rear silencer.

Wherein, the first loudspeaking device comprises a first recorder and a first loudspeaker; the first loudspeaker device comprises a second recorder and a second loudspeaker; the third speaker device includes a third recorder and a third speaker.

According to the active silencing system, after a vehicle is powered on, a gear and an engine speed of the vehicle are obtained through the obtaining module and are sent to the silencing controller, and then the silencing controller judges whether the gear and the engine speed are in any silencing area or not based on all prestored silencing areas; if the gear and the engine rotating speed are in a certain section to be silenced, the silencing controller sends a control instruction to control the loudspeaker device to send out audio with the phase opposite to that of the corresponding noise audio signal in the section to be silenced for noise cancellation; if the gear and the engine rotating speed are not in any section to be silenced, the silencing controller controls the loudspeaker device to not work; according to the active silencing system, under the condition that partial frequency still cannot meet the NVH target after tuning in a limited arrangement space, real-time noise cancellation is achieved through active selective silencing, good driving experience is brought to a user, and the problems of customer complaints and poor sales caused by influence on the vehicle market or after the vehicle market is brought are avoided.

In this embodiment, when the amortization controller judges that above-mentioned gear and engine speed are not in waiting to amortize the interval, if speaker is in the vocal state this moment, the amortization controller still is used for controlling speaker not work.

In this embodiment, the active silencing method for canceling noise after the vehicle is powered on specifically includes the following steps:

s21, the silencing controller acquires the gear and the engine speed sent by the acquisition module through a CAN bus;

s22, judging whether the gear and the rotating speed of the engine are in a certain section to be silenced by the silencing controller; if so, the process goes to S23, otherwise, the process goes to S25.

S23, the silencing controller sends a control instruction to the loudspeaker device;

and S24, the loudspeaker device sends out audio with the phase opposite to that of the noise audio signal corresponding to the section to be silenced for noise cancellation based on the control instruction, and the process goes to S21.

S25, judging whether the loudspeaker device is in a sounding state, if so, turning to S26; otherwise, the process goes to S21.

S26. turn off the speaker, and go to S21.

Optionally, the obtaining module includes a gear position sensor and a rotation speed sensor.

The gear sensor is used for acquiring the gear of the vehicle, and after the gear of the vehicle is acquired, the gear is sent to the silencing controller through the CAN bus.

The rotating speed sensor is used for acquiring the rotating speed of the engine, and after the rotating speed of the engine is acquired, the rotating speed of the engine is sent to the silencing controller through the CAN bus.

On the basis of the foregoing embodiment, in this embodiment, the active silencing system further includes a recording module, where the recording module is configured to acquire an audio frequency with a phase opposite to that of the noise audio signal, and record the audio frequency into the speaker device.

Further, the silencing controller comprises a storage submodule, a judgment submodule and a control submodule.

The storage submodule is used for storing all the sections to be silenced. Wherein, one waiting noise section is a gear and engine speed section corresponding to the noise audio signal.

The judging submodule is used for acquiring the current gear and the engine speed of the vehicle from the CAN bus signal and judging whether the received gear and the engine speed are in any section to be silenced stored in the storage submodule. The judgment submodule is also used for sending the judgment result to the control submodule.

And when the judgment of the judgment submodule is yes, namely the received gear and the engine speed are in a certain to-be-silenced interval stored in the storage submodule, the control submodule is used for sending a control instruction to the loudspeaker. And the control submodule is also used for controlling the loudspeaker device not to sound when the judgment submodule judges that the loudspeaker device does not sound.

Preferably, the active silencing system of the embodiment further comprises a calibration module, wherein the calibration module is used for starting the engine under different working conditions in sequence and recording process noise through the microphone; the calibration module is also used for extracting audio signals which cannot be eliminated through an in-vehicle silencer in the process noise to serve as noise audio signals to be silenced, and acquiring gears and engine rotating speed intervals corresponding to the noise audio signals.

In this embodiment, the audio signal that cannot be eliminated by the in-vehicle muffler in the process noise is: an audio signal of noise having a noise sound pressure level greater than a noise sound pressure level threshold.

Optionally, the calibration module further records emission positions of the noise audio signals, and determines primary and secondary relationships between the emission positions; the emitting position comprises at least one of a front wall position, a front silencer position and a rear silencer position.

Preferably, a speaker device is respectively disposed adjacent to the front wall, the front muffler and the rear muffler.

In this embodiment, the silencing controller also prestores the emission position of each noise audio signal and the primary and secondary relationships between the emission positions.

Preferably, the sound-deadening controller is further configured to control the speaker device at each emission position based on the primary-secondary relationship between the emission positions of the noise audio signal.

As shown in fig. 2, the active silencing system of the embodiment of the present application includes an obtaining module 1, a silencing controller 2, a first audio recorder 3, a first speaker 4, a second audio recorder 5, a second speaker 6, a third audio recorder 7, and a third speaker 8. The first recorder 3 and the first speaker 4 are disposed adjacent to the front wall, the second recorder 5 and the second speaker 6 are disposed adjacent to the front muffler, and the third recorder 7 and the third speaker 8 are disposed adjacent to the rear muffler.

In this embodiment, when the silencing controller determines that the current gear and the engine speed are in a certain section to be silenced, the silencing controller can correspondingly control the speaker at each emission position based on the noise audio signal a corresponding to the section to be silenced and the primary-secondary relationship between the emission positions of the noise audio signal a.

If the noise audio signal a is only emitted from the front wall and the front silencer, and the front wall occupies the main sound source (the decibel value is higher), and the front silencer occupies the secondary sound source (the decibel value is lower), the silencing controller controls the first recorder 3 and the first loudspeaker 4 to emit the main silencing audio frequency with the phase opposite to that of the noise audio signal a and with the higher decibel, and controls the second recorder 5 and the second loudspeaker 6 to emit the secondary silencing audio frequency with the phase opposite to that of the noise audio signal a and with the lower decibel, so as to perform noise cancellation, and meanwhile, the third recorder 7 and the third loudspeaker 8 do not work.

If the noise audio signal a is only emitted from the front silencer and the rear silencer, and the rear silencer occupies the main sound source, and the front silencer occupies the secondary sound source, the silencing controller controls the third recorder 7 and the third speaker 8 to emit the main silencing audio with the phase opposite to that of the noise audio signal a, controls the second recorder 5 and the second speaker 6 to emit the secondary silencing audio with the phase opposite to that of the noise audio signal a, and controls the first recorder 3 and the first speaker 4 not to operate.

If the noise audio signal a is only emitted from the front wall and the rear silencer, and the front wall occupies the main sound source, and the rear silencer occupies the secondary sound source, the silencing controller controls the first recorder 3 and the first loudspeaker 4 to emit the main silencing audio with the phase opposite to that of the noise audio signal a, controls the third recorder 7 and the third loudspeaker 8 to emit the secondary silencing audio with the phase opposite to that of the noise audio signal a, and controls the second recorder 5 and the second loudspeaker 6 to be out of operation.

If the noise audio signal a is emitted only from the front wall, the silencing controller controls only the first recorder 3 and the first loudspeaker 4 to emit silencing audio with a phase opposite to that of the noise audio signal a, and controls the second recorder 5, the second loudspeaker 6, the third recorder 7 and the third loudspeaker 8 not to work.

If the noise audio signal a is only emitted from the rear silencer, the silencing controller only controls the third recorder 7 and the third loudspeaker 8 to emit silencing audio with a phase opposite to that of the noise audio signal a, and controls the first recorder 3, the first loudspeaker 4, the second recorder 5 and the second loudspeaker 6 not to work.

If the noise audio signal a is emitted from the front wall, the front silencer and the rear silencer, the front wall occupies the main sound source, and the front silencer and the rear silencer both occupy the secondary sound source, the silencing controller controls the first recorder 3 and the first loudspeaker 4 to emit a main silencing audio frequency with a phase opposite to that of the noise audio signal a, and controls the second recorder 5, the second loudspeaker 6, the third recorder 7 and the third loudspeaker 8 to emit a secondary silencing audio frequency with a phase opposite to that of the noise audio signal a, so as to cancel noise.

The active silencing system provided by the embodiment of the application is suitable for each active silencing method, when the silencing controller judges that the gear and the engine rotating speed are in a certain silencing interval to be treated, the silencing controller sends a control instruction to the loudspeaker device, so that the loudspeaker device sends out the audio with the phase opposite to that of the corresponding noise audio signal in the silencing interval to perform noise cancellation, and a silencing effect is achieved.

Optionally, an embodiment of the present application further provides an electronic device for active silencing, where the electronic device includes a processor and a memory, and the processor executes code in the memory to implement the following active silencing method:

Optionally, the processor executing the code in the memory may further implement an active muting method as follows:

after a plurality of noise audio signals to be silenced are acquired, audio with the phase opposite to that of the noise audio signals is acquired and stored in the loudspeaker device.

extracting the audio signal of the noise with the noise sound pressure level larger than the noise sound pressure level threshold value in the noise in the process as the audio signal which can not be eliminated by the silencer in the vehicle

and when the gear and the engine rotating speed are not in the section to be silenced, controlling the loudspeaker device not to work.

Preferably, the processor executing the code in the memory may also implement other steps in the aforementioned active muting method.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An active silencing method, comprising the steps of:

after the vehicle is powered on, the gear and the engine speed of the vehicle are obtained, and when the gear and the engine speed are in any section to be silenced, the loudspeaker device is controlled to send out audio with the opposite phase of a corresponding noise audio signal of the section to be silenced, so that noise cancellation is carried out.

2. The active silencing method of claim 1, wherein after said obtaining a plurality of noise audio signals to be silenced, further comprising:

3. The active silencing method of claim 1, wherein: speaker includes recorder and the speaker of being connected with the recorder, the storage has the audio frequency with noise audio signal opposite phase in the recorder.

4. The active silencing method of claim 1, wherein the pre-acquiring a plurality of noise audio signals to be silenced specifically comprises:

5. The active silencing method of claim 4, wherein the audio signals of the process noise that cannot be cancelled by the in-vehicle silencer are: an audio signal of noise having a noise sound pressure level greater than a noise sound pressure level threshold.

6. The active silencing method of claim 4, wherein said recording process noise further comprises:

7. The active silencing method of claim 1, wherein: and when the gear and the engine rotating speed are not in the section to be silenced, controlling the loudspeaker device to be out of work.

8. An active silencing system based on the method of claim 1, comprising:

and the loudspeaker device is used for sending out audio with the phase opposite to that of the noise audio signal corresponding to the section to be silenced for noise cancellation based on the control instruction.

9. The active silencing system of claim 8, further comprising a recording module for capturing audio in phase opposition to the noise audio signal and recording to said speaker.

10. The active muffler system of claim 8, wherein the muffler controller comprises:

the storage submodule is used for storing all the sections to be silenced;