CN111577456B - Control method, device and system of noise reduction device and vehicle - Google Patents
Control method, device and system of noise reduction device and vehicle Download PDFInfo
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- CN111577456B CN111577456B CN201910122359.9A CN201910122359A CN111577456B CN 111577456 B CN111577456 B CN 111577456B CN 201910122359 A CN201910122359 A CN 201910122359A CN 111577456 B CN111577456 B CN 111577456B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
Abstract
The embodiment of the application discloses a control method, equipment, a system and a vehicle of noise reduction equipment. And determining the frequency of the ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of the synthesized wave formed by each ultrasonic wave and the frequency of the noise is within a certain preset range, and simultaneously determining the amplitude of the ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise so that the difference between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range, namely the amplitude of the synthesized wave is infinitely close to the amplitude of the noise, thereby further canceling the noise. Meanwhile, because the frequency of audible sound in the synthetic wave is determined by each ultrasonic frequency, the frequency of the two ultrasonic waves can be adjusted to eliminate noise as low as about 20Hz, and the noise elimination effect is improved.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to a control method, equipment, a system and a vehicle of noise reduction equipment.
Background
In the existing control technology for solving the low-frequency noise caused by the engine in the vehicle, generally, a loudspeaker is used for emitting sound waves in opposite phase with the noise, and the sound waves are superposed with the low-frequency noise generated by the engine to be eliminated, so that the aim of eliminating the low-frequency noise of the engine is fulfilled.
Since the frequency of the noise emitted by the speaker is related to the size of the speaker, the larger the speaker size, the lower the frequency of the emitted noise. However, the space in the vehicle is limited, so that the opening area of the vehicle-mounted speaker is limited, the generated low-frequency noise cannot reach 20Hz, one speaker needs to reduce noise at different positions of the vehicle, the noise at all seats cannot reach the optimal noise elimination effect, and the noise reduction is affected.
Disclosure of Invention
In view of this, embodiments of the present application provide a method, an apparatus, a system and a vehicle for controlling a noise reduction apparatus, so as to improve elimination of low-frequency noise of a vehicle engine and improve a noise reduction effect.
In order to solve the above problem, the technical solution provided by the embodiment of the present application is as follows:
in a first aspect of an embodiment of the present application, a method for controlling a noise reduction device is provided, where the method includes:
acquiring the current rotating speed and throttle signals of an engine;
determining the frequency of noise generated by the engine according to the rotating speed, and determining the frequency of ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of a synthesized wave formed by each ultrasonic wave and the frequency of the noise is in a first preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise;
determining the amplitude of noise generated by the engine according to the throttle signal, and determining the amplitude of ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise, so that the difference between the amplitude of a composite wave formed by the ultrasonic waves and the amplitude of the noise is in a second preset range; the amplitude of the composite wave is equal to the amplitude of each of the ultrasonic waves.
In one possible implementation, the method further includes: acquiring the frequency and/or amplitude of the synthetic wave;
judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range or not;
if the ultrasonic wave is not in the first preset range, adjusting the frequency of the ultrasonic wave generated by the ultrasonic probe;
and/or the presence of a gas in the gas,
and judging whether the difference value between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range, and adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave.
In a second aspect of embodiments of the present application, there is provided a noise reduction apparatus, the apparatus including: at least two ultrasonic probes;
the ultrasonic probe is used for generating corresponding ultrasonic waves according to signals sent by the controller; the composite wave formed by each ultrasonic probe is used for eliminating noise.
In one possible implementation, the noise reducing device is mounted to a seat back, a head rest, a roof, an a-pillar, a B-pillar, a C-pillar, or a D-pillar.
In a third aspect of embodiments of the present application, there is provided a control system of a noise reduction apparatus, the system including: at least two noise reduction apparatus of the second aspect, further comprising a signal processor and a controller;
the signal processor is used for acquiring the current rotating speed and throttle signal of an engine, determining the frequency of noise generated by the engine according to the rotating speed, and determining the amplitude of the noise according to the throttle signal;
the controller is used for receiving the frequency of the noise and the amplitude of the noise sent by the signal processor, and controlling the ultrasonic probes of the noise reduction equipment to generate ultrasonic waves according to the frequency of the noise and the amplitude of the noise, so that the difference between the frequency of a synthesized wave formed by the ultrasonic waves generated by each ultrasonic probe and the frequency equal to the noise is within a first preset range, and the difference between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise; the amplitude of the composite wave is equal to the amplitude of each ultrasonic wave;
the noise reduction equipment is used for generating ultrasonic waves according to the signals sent by the controller.
In one possible implementation, the system further includes:
the error sensor is used for acquiring the frequency and/or the amplitude of the synthesized wave and judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range; and/or judging whether the difference value of the amplitude of the synthetic wave and the amplitude of the noise is within a second preset range.
In a possible implementation manner, the controller is further configured to adjust the frequency of the ultrasonic wave generated by the ultrasonic probe when the judgment result of the error sensor is that the difference between the frequency of the synthesized wave and the frequency of the noise is not within the first preset range; and/or when the judgment result of the error sensor indicates that the difference value between the amplitude of the synthetic wave and the amplitude of the noise is not in a second preset range, adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave.
In a fourth aspect of the embodiments of the present application, there is provided a vehicle including the control system of the third aspect, further including: an engine;
a control system for controlling the noise reduction device to generate ultrasonic waves for eliminating noise;
the engine is used for generating power for the vehicle.
In one possible implementation, the noise reduction devices of the control system are respectively mounted on both sides of the top of the seat back.
Therefore, the embodiment of the application has the following beneficial effects:
according to the method and the device, the current rotating speed and the throttle signal of the engine are firstly obtained, the frequency of the noise is determined according to the rotating speed, and the amplitude of the noise is determined according to the throttle signal. And determining the frequency of the ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of the synthesized wave formed by each ultrasonic wave and the frequency of the noise is within a certain preset range, and simultaneously determining the amplitude of the ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise so that the difference between the amplitude of the synthesized wave formed by each ultrasonic wave and the amplitude of the noise is within a second preset range, namely the amplitude of the synthesized wave is infinitely close to the amplitude of the noise, and the noise can be counteracted because the synthesized wave and the noise have the same frequency and opposite phase. Meanwhile, because the frequency of the audible sound in the synthetic wave is determined by the frequency of each ultrasonic wave, the frequency of the audible sound in the synthetic wave can be infinitely close to various noise frequencies by adjusting the frequency of the ultrasonic wave, so that the noise as low as about 20Hz can be eliminated, and the noise elimination effect is improved. In addition, compared with the prior art that the body vibration is easily caused by using the loudspeaker for silencing, the ultrasonic wave has small volume, cannot cause the body vibration, and is easy to install.
Drawings
FIG. 1 is a diagram illustrating a prior art noise reduction using a speaker;
FIG. 2 is a schematic diagram of beat frequency effect generated by two ultrasonic waves according to an embodiment of the present application;
fig. 3 is a structural diagram of a noise reduction apparatus according to an embodiment of the present application;
fig. 4 is a structural view of a pillar provided in the embodiment of the present application;
fig. 5 is a schematic view illustrating an installation of a noise reduction device according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a control method of a noise reduction apparatus according to an embodiment of the present disclosure;
fig. 7 is a control system diagram of a noise reduction apparatus according to an embodiment of the present application;
fig. 8 is a vehicle structure diagram provided in the embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
In order to facilitate understanding of the technical solutions provided in the present application, the following first describes the background art of the present application.
The inventor finds that in the research on the traditional engine noise reduction device, the traditional low-frequency active noise reduction technology of the engine in the vehicle has two types: one is a feed-forward approach, i.e., the reference noise signal and the noise reduction region are not in one acoustic environment; the other is a feedback mode, and the reference noise signal and the noise reduction region are in one acoustic environment. However, both feed-forward and feed-back require the loudspeaker to emit sound waves in opposite phases to cancel the noise. However, the opening area of the vehicle-mounted speaker is limited, the lower limit of the low frequency of the vehicle-mounted speaker is less than 20Hz, and one speaker also can reduce noise of several seats, for example, as shown in fig. 1, because the distances between the speaker and different seats in the vehicle are different, the optimal noise reduction effect of all seats cannot be achieved, and the noise reduction effect is influenced.
Based on this, the embodiment of the present application provides a noise reduction device, which includes at least two ultrasonic probes, and the two ultrasonic probes can be located beside the ears of the passengers, that is, each seat includes two noise reduction devices, and each noise reduction device is used for eliminating the sound beside one side of the ears, so as to eliminate the noise beside both ears of the passengers. In practical application, the controller controls the two ultrasonic probes to emit ultrasonic waves according to the rotating speed and the throttle signal of the engine, and a synthesized wave formed by the two ultrasonic waves through a beat frequency effect is in the same frequency and opposite phase with the noise beside the ears so as to offset the noise. In concrete application, the frequency of two ultrasonic waves of accessible adjustment for the frequency of audible sound is infinitely close various noise frequency in the synthetic wave, thereby can realize eliminating 20 or noise about, simultaneously, all install the equipment of making an uproar on every seat, because the directive property of ultrasonic wave is close to passenger's ear side well, the location is accurate, improves the noise reduction effect.
For the convenience of understanding the technical solution of the present application, the following description will be made on the principle of noise reduction using ultrasonic waves in the present application.
Two electromagnetic waves with similar frequencies and amplitudes generate beat frequency effect when transmitted in the same direction, and the resultant wave can be regarded as a modulated wave, as shown in fig. 2. The mathematical expression of two ultrasonic waves with similar frequencies and amplitudes can be written as follows: x is the number of1＝a*sinα，x2A sin beta, the resultant wave is x ═ x1+x2By trigonometric function and difference product formula, can obtain
Wherein 2a is the amplitude of the composite wave, which may correspond to the amplitude of the noise transmitted by the engine;
the modulation frequency of the synthesized wave is high, and is more than 20KHz, but when alpha and beta are close,
may be in the audible frequency range, which may correspond to the engine-delivered noise frequency;
then the new frequency of the composite wave, is also the ultrasonic wave.
The range of human audible sound is 20Hz-20kHz, and the range of ultrasonic wave is more than 20 kHz. When the alpha and beta are infinitely close, the audible frequency in the synthesized wave can be close to zero, so that the noise as low as 20Hz can be eliminated, and the new frequency in the synthesized wave is still ultrasonic wave and does not generate new noise.
Based on the above noise reduction principle, an embodiment of the present application provides a noise reduction apparatus, as shown in fig. 3, including at least two ultrasonic probes, where each ultrasonic probe is configured to generate a corresponding ultrasonic wave according to a signal sent by a controller.
In specific implementation, two ultrasonic probes in the noise reduction equipment can respectively generate ultrasonic waves with similar frequencies and same amplitudes, and a composite wave formed by beat frequency effects of two ultrasonic waves has the same frequency and opposite phase with noise. Due to the strong directivity of the ultrasonic waves, the two ultrasonic probes can point to the head direction of the passenger, so that the synthesized wave can offset the noise beside the ear of the passenger.
It can be understood that noise is required to be removed from both ears of the passenger, and therefore, two noise reduction devices are required to be installed for removing the noise of the left and right ears, respectively. In practice, the noise reducing device may be mounted to a seat back, headrest, headliner, a-pillar, B-pillar, C-pillar, or D-pillar. The column A is a bead between a front windshield and a front door of the automobile, the column B is a column between the front door and the rear door of the automobile, the column C is a column between a rear door and a rear windshield, and the column D is a column at the rearmost side of the rear windshield, as shown in FIG. 4, A, B, C and the column D are named in sequence according to the front and the rear of the automobile body, and all columns for supporting the roof are named.
In practical application, two noise reduction devices may be mounted on each seat back, so that all seats in a vehicle can achieve efficient noise reduction effect, specifically, as shown in fig. 5, the two sides of the seat back are respectively mounted with the noise reduction devices.
In order to facilitate understanding of the solutions provided by the embodiments of the present application, the control method will be described below with reference to the accompanying drawings.
Referring to fig. 6, which is a flowchart of a control method of a noise reduction apparatus according to an embodiment of the present application, as shown in fig. 6, the method may include:
s601: and acquiring the current rotating speed and throttle signals of the engine.
In this embodiment, in order to make the frequency and amplitude of the synthesized wave formed by the ultrasonic waves generated by each ultrasonic probe in the noise reduction device as the same as possible, the rotation speed of the engine and the accelerator signal are first obtained, so as to determine the frequency of the noise according to the rotation speed of the engine, and determine the amplitude of the noise according to the accelerator signal.
S602: according to the rotating speed, the frequency of the noise generated by the engine is determined, and according to the frequency of the noise, the frequency of the ultrasonic wave generated by each ultrasonic probe in the noise reduction device is determined, so that the difference between the frequency of the synthesized wave formed by the ultrasonic waves and the frequency of the noise is within a first preset range.
In this embodiment, after the engine rotation speed is obtained, the frequency of the noise is determined according to the rotation speed, and then the frequency of the ultrasonic wave generated by each ultrasonic probe in the noise reduction device is determined according to the frequency of the noise, so that the difference between the frequency of the synthesized wave formed by each ultrasonic wave and the frequency of the noise is within a first preset range, that is, the frequency of the synthesized wave and the frequency of the noise are infinitely close.
In a specific implementation, the frequency of the noise can be determined according to the conversion relation between the rotating speed and the frequency. For example, the rotation speed r, the frequency f and the order n satisfy the following conditions: f is r/60 n. In addition, the corresponding relation between the engine rotating speed and the noise frequency can be determined through an experimental calibration method, and after the engine rotating speed is collected, the frequency corresponding to the rotating speed can be found according to the corresponding relation.
Wherein the frequency of the synthesized wave is determined by the frequency of each ultrasonic wave, and the phase of the synthesized wave is opposite to that of the noise. As can be seen from the above description, the frequency of the synthesized wave for eliminating noise is equal to half of the difference between the two ultrasonic frequencies, and in a specific implementation, the frequency of the ultrasonic wave generated by one of the ultrasonic probes is taken as a fixed value, and the frequency of the ultrasonic wave generated by the other ultrasonic probe is adjusted, so that the frequency of the synthesized wave formed by the two ultrasonic waves is as close to the noise frequency as possible.
S603: and determining the amplitude of noise generated by the engine according to the throttle signal, and determining the amplitude of ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise so that the difference between the amplitude of a composite wave formed by the ultrasonic waves and the amplitude of the noise is within a second preset range.
In this embodiment, after the throttle signal is obtained, the amplitude of the noise generated by the engine is determined according to the throttle signal. Then, the amplitude of the ultrasonic wave generated by each ultrasonic probe in the noise reduction device is determined according to the noise amplitude, so that the difference between the amplitude of the formed composite wave and the amplitude of the noise is within a second preset range, namely the amplitude of the composite wave is infinitely close to the amplitude of the noise, wherein the amplitude of the composite wave is equal to the amplitude of each ultrasonic wave, and therefore the composite wave can counteract the noise as much as possible.
In the concrete implementation, the corresponding relation between the throttle signal and the noise amplitude can be calibrated in advance through an experimental calibration method. And after the throttle signal is acquired, determining the amplitude of the noise according to the conversion relation between the throttle signal and the amplitude. As can be seen from the above description, the amplitude for eliminating noise in the composite wave is determined by the two ultrasonic amplitudes, and in a specific implementation, the ultrasonic amplitude generated by one of the ultrasonic probes can be used as a fixed value, and the ultrasonic amplitude generated by the other ultrasonic probe is adjusted, so that the composite wave amplitude formed by the two ultrasonic waves is as close to the noise amplitude as possible.
It can be understood that due to the limitation of the adjustment precision of the ultrasonic probe, in practical applications, it may not be possible to achieve an infinite approximation of the frequency of the synthesized wave formed by two ultrasonic waves to the frequency of the noise and an infinite approximation of the amplitude of the synthesized wave to the amplitude of the noise at one time. Based on this, the present embodiment provides a method, which may adjust the ultrasonic waves generated by each ultrasonic probe according to the composite waves collected in real time in the noise reduction process, specifically, obtain the frequency and/or amplitude of the composite waves; judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range or not; if the ultrasonic wave is not in the first preset range, adjusting the frequency of the ultrasonic wave generated by the ultrasonic probe; and/or judging whether the difference value between the amplitude of the synthetic wave and the amplitude of the noise is within a second preset range, and adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave. The first preset range is a difference range of the frequency of the synthetic wave and the frequency of the noise, so that the frequency of the synthetic wave is as close to the frequency of the noise as possible; the second preset range is a range that allows the amplitude of the synthesized wave to be different from the amplitude of the noise so that the amplitude of the synthesized wave is as close as possible to the amplitude of the noise.
In specific implementation, the composite wave formed by each noise reduction device is collected in real time, the frequency and the amplitude of the composite wave are obtained, whether the frequency and the noise frequency of the composite wave are within a first preset range or not is judged respectively, if yes, the ultrasonic wave generated by the ultrasonic probe in the noise reduction device does not need to be adjusted, and if not, the frequency of the ultrasonic wave generated by one ultrasonic probe can be adjusted, so that the difference between the frequency for eliminating noise and the frequency of the noise in the composite wave is within the first preset range. And similarly, judging whether the amplitude of the synthesized wave and the amplitude of the noise are in a second preset range, if so, not adjusting the ultrasonic wave generated by the ultrasonic probe in the noise reduction equipment, and if not, adjusting the amplitude of the ultrasonic wave generated by one of the ultrasonic probes so that the difference between the amplitude of the synthesized wave and the amplitude of the noise is in the second preset range.
According to the embodiment, the current rotating speed and the throttle signal of the engine are obtained, the frequency of the noise is determined according to the rotating speed, and the amplitude of the noise is determined according to the throttle signal. And determining the frequency of the ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of the synthesized wave formed by each ultrasonic wave and the frequency of the noise is within a certain preset range, and simultaneously determining the amplitude of the ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise so that the difference between the amplitude of the synthesized wave formed by each ultrasonic wave and the amplitude of the noise is within a second preset range, namely the amplitude of the synthesized wave is infinitely close to the amplitude of the noise, and the noise can be counteracted because the synthesized wave and the noise have the same frequency and opposite phase. Meanwhile, because the frequency of the audible sound in the synthetic wave is determined by each ultrasonic frequency, the frequency of the audible sound in the synthetic wave can be infinitely close to various noise frequencies by adjusting the frequency of the ultrasonic wave, so that the noise as low as about 20Hz can be eliminated, and the noise elimination effect is improved. In addition, compared with the prior art that the body vibration is easily caused by using the loudspeaker for silencing, the ultrasonic wave has small volume, cannot cause the body vibration, and is easy to install.
Based on the above method embodiments, the present application provides a control system of a noise reduction device, which will be described below with reference to the accompanying drawings.
Referring to fig. 7, which is a structural diagram of a control system of a noise reduction apparatus according to an embodiment of the present disclosure, as shown in fig. 7, the system may include: a signal processor 701, a controller 702, and at least two of the above noise reduction devices 703;
the signal processor 701 is configured to obtain a current rotation speed and an accelerator signal of an engine, determine a frequency of noise generated by the engine according to the rotation speed, and determine an amplitude of the noise according to the accelerator signal;
the controller 702 is configured to receive the frequency of the noise and the amplitude of the noise sent by the signal processor, and control the ultrasonic probes of the noise reduction device to generate ultrasonic waves according to the frequency of the noise and the amplitude of the noise, so that a difference between a frequency of a synthesized wave formed by the ultrasonic waves generated by each ultrasonic probe and a frequency equal to the noise is within a first preset range, and a difference between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise; the amplitude of the composite wave is equal to the amplitude of each ultrasonic wave;
the noise reduction device 703 is configured to generate ultrasonic waves according to the signal sent by the controller.
In one possible implementation, the system further includes:
the error sensor is used for acquiring the frequency and/or the amplitude of the synthesized wave and judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range; and/or judging whether the difference value of the amplitude of the synthetic wave and the amplitude of the noise is within a second preset range.
In a possible implementation manner, the controller is further configured to adjust the frequency of the ultrasonic wave generated by the ultrasonic probe when the judgment result of the error sensor is that the difference between the frequency of the synthesized wave and the frequency of the noise is not within the first preset range; and/or when the judgment result of the error sensor indicates that the difference value between the amplitude of the synthetic wave and the amplitude of the noise is not in a second preset range, adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave.
It should be noted that, in this embodiment, implementation of each unit or module may refer to the foregoing method embodiment, and details are not described herein again.
According to the embodiment, the current rotating speed and the throttle signal of the engine are firstly acquired, the frequency of the noise is determined according to the rotating speed, and the amplitude of the noise is determined according to the throttle signal. And determining the frequency of the ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of the synthesized wave formed by each ultrasonic wave and the frequency of the noise is within a certain preset range, and simultaneously determining the amplitude of the ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise so that the difference between the amplitude of the synthesized wave formed by each ultrasonic wave and the amplitude of the noise is within a second preset range, namely the amplitude of the synthesized wave is infinitely close to the amplitude of the noise, and the noise can be counteracted because the synthesized wave and the noise have the same frequency and opposite phase. Meanwhile, because the frequency of the audible sound in the synthetic wave is determined by the frequency of the ultrasonic wave, the frequency of the audible sound in the synthetic wave can be infinitely close to various noise frequencies by adjusting the frequency of the ultrasonic wave, so that the noise as low as about 20Hz can be eliminated, and the noise elimination effect is improved. In addition, compared with the prior art that the body vibration is easily caused by using the loudspeaker for silencing, the ultrasonic wave has small volume, cannot cause the body vibration, and is easy to install.
Based on the above system, the present application provides a vehicle, and referring to fig. 8, provides a vehicle structure diagram, and the vehicle may include: a control system 801 and an engine 802 of the noise reduction apparatus;
a control system 801 for controlling the noise reduction device to generate ultrasonic waves for noise removal;
an engine 802 for generating power for the vehicle.
In one possible implementation, the noise reduction devices of the control system are respectively mounted on both sides of the top of the seat back.
It should be noted that, for specific implementation of the control system in this embodiment, reference may be made to the above embodiments, and details of this embodiment are not described herein again.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is further noted that, herein, relational terms such as first and second, and the like may be 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 steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use 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 (9)
1. A method of controlling a noise reduction apparatus, the method comprising:
acquiring the current rotating speed and throttle signals of an engine;
determining the frequency of noise generated by the engine according to the rotating speed, and determining the frequency of ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of a synthesized wave formed by each ultrasonic wave and the frequency of the noise is in a first preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise;
determining the amplitude of noise generated by the engine according to the throttle signal, and determining the amplitude of ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise, so that the difference between the amplitude of a composite wave formed by the ultrasonic waves and the amplitude of the noise is in a second preset range; the amplitude of the composite wave is equal to the amplitude of each of the ultrasonic waves.
2. The method of claim 1, further comprising:
acquiring the frequency and/or amplitude of the synthetic wave;
judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range or not;
if the ultrasonic wave is not in the first preset range, adjusting the frequency of the ultrasonic wave generated by the ultrasonic probe;
and/or the presence of a gas in the gas,
and judging whether the difference value between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range, and adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave.
3. A noise reduction apparatus, characterized in that the apparatus comprises: at least two ultrasonic probes;
the ultrasonic probe is used for generating corresponding ultrasonic waves according to signals sent by the controller; the composite wave formed by each ultrasonic probe is used for eliminating noise; the ultrasonic probes are symmetrically arranged relative to the passenger seat;
the signal sent by the controller specifically includes: acquiring the current rotating speed and throttle signals of an engine; determining the frequency of noise generated by the engine according to the rotating speed, and determining the frequency of ultrasonic waves generated by each ultrasonic probe in the noise reduction equipment according to the frequency of the noise so that the difference between the frequency of a synthesized wave formed by each ultrasonic wave and the frequency of the noise is in a first preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise; determining the amplitude of noise generated by the engine according to the throttle signal, and determining the amplitude of ultrasonic waves generated by each ultrasonic probe according to the amplitude of the noise, so that the difference between the amplitude of a composite wave formed by the ultrasonic waves and the amplitude of the noise is in a second preset range; the amplitude of the composite wave is equal to the amplitude of each of the ultrasonic waves.
4. The apparatus of claim 3, wherein the noise reduction apparatus is mounted to a seat back, a head rest, a headliner, an A-pillar, a B-pillar, a C-pillar, or a D-pillar.
5. A control system for a noise reducing device, the system comprising: at least two noise reduction devices according to any of claims 3 or 4, further comprising a signal processor and a controller;
the signal processor is used for acquiring the current rotating speed and throttle signal of an engine, determining the frequency of noise generated by the engine according to the rotating speed, and determining the amplitude of the noise according to the throttle signal;
the controller is used for receiving the frequency of the noise and the amplitude of the noise sent by the signal processor, and controlling the ultrasonic probes of the noise reduction equipment to generate ultrasonic waves according to the frequency of the noise and the amplitude of the noise, so that the difference between the frequency of a synthesized wave formed by the ultrasonic waves generated by each ultrasonic probe and the frequency equal to the noise is within a first preset range, and the difference between the amplitude of the synthesized wave and the amplitude of the noise is within a second preset range; the frequency of the synthetic wave is determined by the frequency of each ultrasonic wave, and the synthetic wave is opposite to the phase of the noise; the amplitude of the composite wave is equal to the amplitude of each ultrasonic wave;
the noise reduction equipment is used for generating ultrasonic waves according to the signals sent by the controller.
6. The system of claim 5, further comprising:
the error sensor is used for acquiring the frequency and/or amplitude of the synthesized wave and judging whether the difference value of the frequency of the synthesized wave and the frequency of the noise is within the first preset range; and/or judging whether the difference value of the amplitude of the synthetic wave and the amplitude of the noise is within a second preset range.
7. The system of claim 6, wherein the controller is further configured to adjust the frequency of the ultrasonic wave generated by the ultrasonic probe when the difference between the frequency of the synthesized wave and the frequency of the noise is not within the first preset range according to the determination result of the error sensor; and/or when the judgment result of the error sensor indicates that the difference value between the amplitude of the synthetic wave and the amplitude of the noise is not in a second preset range, adjusting the amplitude of the ultrasonic wave generated by the ultrasonic wave.
8. A vehicle characterized by comprising the control system of any one of claims 5-7, and further comprising: an engine;
a control system for controlling the noise reduction device to generate ultrasonic waves for eliminating noise;
the engine is used for generating power for the vehicle.
9. The vehicle of claim 8, wherein the noise reduction devices of the control system are mounted on either side of the top of the seat back.
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