CN110021288B - Active noise reduction control method and system for vehicle - Google Patents
Active noise reduction control method and system for vehicle Download PDFInfo
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- CN110021288B CN110021288B CN201810023755.1A CN201810023755A CN110021288B CN 110021288 B CN110021288 B CN 110021288B CN 201810023755 A CN201810023755 A CN 201810023755A CN 110021288 B CN110021288 B CN 110021288B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
- G10K2210/12821—Rolling noise; Wind and body noise
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3011—Single acoustic input
Abstract
The invention relates to a vehicle active noise reduction control method and a system thereof. The control method comprises the following steps: 1) reading a noise signal at a target location; 2) calculating a frequency parameter of a drive axle according to the vehicle speed signal, and extracting a phase parameter of the noise of the drive axle from the noise signal according to the frequency parameter; 3) acquiring amplitude parameters of the noise of the drive axle according to the vehicle speed signal and the suspension compression amount signal; 4) and generating a noise reduction signal of the drive axle according to the frequency parameter, the phase parameter and the amplitude parameter of the noise of the drive axle, and reducing the noise of the target position by using the noise reduction signal of the drive axle. The invention extracts the phase parameter of the drive axle noise from the noise signal, and the amplitude parameter of the drive axle is obtained according to the vehicle speed signal and the suspension compression signal, thus greatly simplifying the logic algorithm, greatly improving the operation efficiency, shortening the reaction time, ensuring no time difference between the noise reduction signal and the noise signal, and effectively ensuring the active noise reduction effect of the invention.
Description
Technical Field
The invention relates to a vehicle active noise reduction control method and a system thereof, belonging to the technical field of vehicle active noise reduction.
Background
The riding comfort of the automobile is one of important indexes influencing the performance of the whole automobile, wherein the control of the noise level in the whole automobile is an important way for improving the brand effect of the automobile. For a passenger car, the main noise sources in the car during the driving process are engine noise and drive axle gear noise, the influence of the noise sources on the noise in the car accounts for more than 80%, for a pure electric passenger car, the drive axle noise is smaller because of the motor noise, and becomes the main factor influencing the pure electric passenger car, so that the noise level in the car can be obviously improved by reducing the drive axle gear noise, and the comfort of the whole car is improved.
The conventional automobile noise reduction measures are usually realized by optimizing the noise of a drive axle body, improving the sound absorption and insulation performance of the whole automobile, attenuating the vibration of a chassis and the like, all of the measures belong to passive noise reduction modes, the noise reduction degree is limited, and the high requirements of customers cannot be met. The active noise reduction technology is that a signal which is equal to the noise signal at the position and opposite to the noise signal is generated near the human ear, so that the signal and the noise signal are mutually offset, and the purpose of noise reduction is achieved.
The solving process of the denoising signal in the existing active denoising device is complex, the denoising signal sent by a loudspeaker is lagged, the phase difference exists between the sent signal and the noise signal, the read noise signal cannot be matched in real time, the active denoising effect is poor, and even the situation of noise increase in a vehicle is caused.
Disclosure of Invention
The invention aims to provide a vehicle active noise reduction control method and a system thereof, which are used for solving the problem that a noise reduction signal generated by the existing active noise reduction device cannot be matched with a read noise signal in real time.
In order to achieve the above object, the technical solution of the active noise reduction control method for a vehicle of the present invention comprises the following steps: 1) reading a noise signal at a target location; 2) calculating a frequency parameter of a drive axle according to the vehicle speed signal, and extracting a phase parameter of the noise of the drive axle from the noise signal according to the frequency parameter; 3) acquiring amplitude parameters of the noise of the drive axle according to the vehicle speed signal and the suspension compression amount signal; 4) and generating a noise reduction signal of the drive axle according to the frequency parameter, the phase parameter and the amplitude parameter of the noise of the drive axle, and reducing the noise of the target position by using the noise reduction signal of the drive axle.
Further, the step 3) of obtaining the amplitude parameter of the axle noise according to the vehicle speed signal and the suspension compression amount signal includes: the method comprises the steps of establishing a database of corresponding relations among vehicle speed signals, suspension compression signals and drive axle noise amplitude parameters under various operating conditions in advance, and obtaining the corresponding drive axle noise amplitude parameters from the database according to the vehicle speed signals and the suspension compression signals.
Further, the target position is a position on the seat corresponding to the height of the ear of the occupant.
The technical scheme of the active noise reduction system of the vehicle comprises a sound acquisition device, a sound playing device and a control system, wherein the control system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and the processor executes the computer program to realize the following steps: 1) reading a noise signal at a target location; 2) calculating a frequency parameter of a drive axle according to the vehicle speed signal, and extracting a phase parameter of the noise of the drive axle from the noise signal according to the frequency parameter; 3) acquiring amplitude parameters of the noise of the drive axle according to the vehicle speed signal and the suspension compression amount signal; 4) and generating a noise reduction signal of the drive axle according to the frequency parameter, the phase parameter and the amplitude parameter of the noise of the drive axle, and reducing the noise of the target position by using the noise reduction signal of the drive axle.
Further, the step 3) of obtaining the amplitude parameter of the axle noise according to the vehicle speed signal and the suspension compression amount signal includes: the method comprises the steps of establishing a database of corresponding relations among vehicle speed signals, suspension compression signals and drive axle noise amplitude parameters under various operating conditions in advance, and obtaining the corresponding drive axle noise amplitude parameters from the database according to the vehicle speed signals and the suspension compression signals.
Further, the target position is a position on the seat corresponding to the height of the ear of the occupant.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the phase parameter of the drive axle noise is extracted from the noise signal, and the amplitude parameter of the drive axle is obtained according to the vehicle speed signal and the suspension compression signal, so that the logic algorithm can be greatly simplified, the operation efficiency is greatly improved, the reaction time is shortened, no time difference between the noise reduction signal and the noise signal can be ensured, and the active noise reduction effect of the invention is effectively ensured.
Drawings
FIG. 1 is a schematic structural diagram of an active noise reduction system of a vehicle in an embodiment;
FIG. 2 is a logic flow diagram of an embodiment of a method for active noise reduction control of a vehicle;
FIG. 3 shows the noise amplitude extraction conditions of the drive axle in the entire vehicle in the embodiment;
FIG. 4 is a database of noise amplitudes of drive axles in a vehicle according to an embodiment;
FIG. 5 is a diagram showing the comparison effect before and after the active noise reduction of the in-vehicle noise in the embodiment.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The specific embodiment is as follows:
as shown in fig. 1, the active noise reduction system for a vehicle in this embodiment includes a microphone 1, a speaker 2, and a control system 3, the microphone 1 and the speaker 2 are disposed at the ear of a seat 4 and connected to the control system 3 through a wire harness, the control system 3 includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor executes the computer program to implement the active noise reduction control logic for a vehicle in this embodiment.
In this embodiment, the control system 3 mainly comprises an audio analysis module 31, a noise data module 32, and a signal generation module 33, wherein the audio analysis module 31 mainly determines a phase parameter of a noise signal read by the microphone 1, the noise data module 32 is used to store a noise amplitude parameter of the drive axle under a normal operating condition of the entire vehicle, and the signal generation module 33 mainly generates a matched drive axle noise reduction signal according to the drive axle phase parameter transmitted by the audio analysis module 31 and the drive axle amplitude parameter in the noise data module 32, and transmits the drive axle noise reduction signal through the speaker 2 to cancel the drive axle noise at the human ear in the vehicle.
The specific operation steps of the control method in this embodiment are shown in fig. 2:
firstly, according to each operation condition of the noise of the drive axle in the whole vehicle, as shown in fig. 3, testing and obtaining the amplitude parameter of the noise of the drive axle in the vehicle, and forming an amplitude database of the noise of the drive axle in the vehicle in a data difference mode, as shown in fig. 4; the noise amplitude database of the drive axle in the vehicle is calibrated to a noise data module 32 in the control system 3;
secondly, the microphone 1 and the loudspeaker 2 are arranged at the position of the ears of a person on a seat 4 in the vehicle, and the control system 3 is connected with the microphone 1, the loudspeaker 2 and the vehicle control unit 5 through lines;
the microphone 1 reads the noise signal of the seat in real time and feeds the noise signal back to the audio analysis module 31 in the control system 3;
a signal generating module 33 in the control system 3 reads a vehicle speed signal and a suspension compression signal in the vehicle control unit 5, calculates an order frequency component c of the drive axle noise according to the vehicle speed signal, and determines a phase parameter a of the drive axle noise at the seat according to the order frequency component of the drive axle noise at the moment by an audio analyzing module 31; the signal generating module 33 extracts the amplitude d of the axle noise in this state from the axle noise amplitude library in the noise data module 32 according to the axle speed signal and the suspension compression amount signal, and generates an axle noise reduction signal α (t) according to the phase parameter a of the axle noise, the order frequency component c of the axle noise and the amplitude d of the axle noise acquired at this time.
The signal generating module 33 in the control system 3 transmits the drive axle noise reduction signal alpha (t) to the loudspeaker 2 and sends out the drive axle noise reduction signal alpha (t) through the loudspeaker 2, and the drive axle noise reduction signal alpha (t) has the same amplitude and opposite phase with the drive axle noise signal, so that the noise of the drive axle at the ears of the seat can be effectively reduced, as shown in fig. 5.
In the practical application process, only the primary frequency of the drive axle noise can be calculated according to specific requirements, and the phase parameter corresponding to the drive axle noise is determined according to the primary frequency; of course, the major-order frequency of the transaxle noise and the second-order frequency … N-order frequency of the transaxle noise may be calculated according to specific requirements, and the phase parameter corresponding to the transaxle noise may be determined according to the order frequency components.
In this embodiment, the sound collection device employs a microphone, and as another embodiment, another sound collection device may be employed.
In this embodiment, the sound playing device is a speaker, and as another embodiment, other sound playing devices, such as a speaker, may also be used.
In this embodiment, the microphone and the speaker are both disposed at positions corresponding to the heights of the ears of the passenger on the seat, and as other embodiments, they may be disposed at other suitable positions according to requirements, such as on the inner wall of the vehicle compartment near the passenger.
In the embodiment, the drive axle noise amplitude parameter is obtained through the vehicle speed signal and the suspension compression amount signal by establishing a database, and as other embodiments, the drive axle noise amplitude parameter may also be obtained through the vehicle speed signal and the suspension compression amount signal by constructing a specific function expression.
By adopting the technical scheme of the embodiment, the phase parameter of the drive axle noise is extracted from the noise signal, and the amplitude parameter of the drive axle is obtained according to the vehicle speed signal and the suspension compression signal, so that the logic algorithm can be greatly simplified, the operation efficiency is greatly improved, the reaction time is shortened, no time difference between the noise reduction signal and the noise signal can be ensured, and the active noise reduction effect is effectively ensured.
Although the present invention has been described with reference to a preferred embodiment, 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 (4)
1. A vehicle active noise reduction control method is characterized by comprising the following steps:
1) reading a noise signal at a target location;
2) calculating a frequency parameter of a drive axle according to the vehicle speed signal, and extracting a phase parameter of the noise of the drive axle from the noise signal according to the frequency parameter;
3) acquiring amplitude parameters of the noise of the drive axle from an amplitude library according to the vehicle speed signal and the suspension compression quantity signal; the amplitude library is a database of corresponding relations among vehicle speed signals, suspension compression signals and amplitude parameters of the drive axle noise under each operation condition, which are established in advance;
4) and generating a noise reduction signal of the drive axle according to the frequency parameter, the phase parameter and the amplitude parameter of the noise of the drive axle, and reducing the noise of the target position by using the noise reduction signal of the drive axle.
2. The vehicle active noise reduction control method according to claim 1, wherein the target position is a position on a seat corresponding to a height of an ear of an occupant.
3. A vehicle active noise reduction system, comprising a sound collection device, a sound playing device, and a control system, wherein the control system comprises a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor executes the computer program to perform the following steps:
1) reading a noise signal at a target location;
2) calculating a frequency parameter of a drive axle according to the vehicle speed signal, and extracting a phase parameter of the noise of the drive axle from the noise signal according to the frequency parameter;
3) acquiring an amplitude parameter of the drive axle noise from an amplitude library according to the vehicle speed signal and the suspension compression quantity signal; the amplitude library is a database of corresponding relations among vehicle speed signals, suspension compression signals and amplitude parameters of the drive axle noise under each operation condition, which are established in advance;
4) and generating a noise reduction signal of the drive axle according to the frequency parameter, the phase parameter and the amplitude parameter of the noise of the drive axle, and reducing the noise of the target position by using the noise reduction signal of the drive axle.
4. The vehicle active noise reduction system of claim 3, wherein the target location is a location on the seat corresponding to a height of an ear of an occupant.
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| CN201810023755.1A CN110021288B (en) | 2018-01-10 | 2018-01-10 | Active noise reduction control method and system for vehicle |
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| CN201810023755.1A CN110021288B (en) | 2018-01-10 | 2018-01-10 | Active noise reduction control method and system for vehicle |
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| CN111938504B (en) * | 2019-09-19 | 2022-04-29 | 北京安声浩朗科技有限公司 | Space active noise reduction method, device and system and dust collector |
| CN110688956B (en) * | 2019-09-27 | 2023-06-09 | 清华大学苏州汽车研究院（相城） | Reference signal selection method for active control of automobile road noise |
| CN112185335B (en) * | 2020-09-27 | 2024-03-12 | 上海电气集团股份有限公司 | Noise reduction method and device, electronic equipment and storage medium |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co., Ltd Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: Zhengzhou Yutong Bus Co., Ltd |