JPH0798595A - Vibration reducing device - Google Patents

Abstract

PURPOSE:To secure an effective vibration reducing control even when a transfer characteristic of vibration is varied by correcting transfer characteristic data of vibration referring to the original characteristic data based on a vibration reducing signal outputted to a vibrating means and an input signal from a vibration detecting means. CONSTITUTION:A synthesized sound by noise transmitted from an engine to a vehicular room and sound outputted from each loudspeaker 2 is detected by each microphone 1, and microphone signals e1-eM is outputted to controller 3. Loudspeaker output signals y1-yL outputted to each loudspeaker 2 is a reversed sound signal of an opposite phase to engine noise, and it is obtained by passing through a reference signal outputted from an engine rotation period synchronizing circuit 6 into digital filters F1-FL based on an ignition pulse of an engine. And transfer characteristic data of a sound between the loudspeaker 2 and the microphone 1 is corrected referring to the existing data based on a speaker output signal y(t) and a microphone signal (t).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device for reducing a vibration at a predetermined vibration reducing position by causing an oscillating means such as a speaker to generate an inverting vibration having a phase opposite to that of a vibration from a vibration source. In particular, the present invention relates to a device for identifying vibration transfer characteristic data between the vibrating means and the vibration reducing portion. In addition, "sound" is also a kind of "vibration", and the term "vibration" includes "sound" in the present invention.

[0002]

2. Description of the Related Art Conventionally, as an active vibration reducing device of this kind, a reference signal for generating a reference signal corresponding to noise generated by an in-vehicle engine, as disclosed in, for example, Japanese Patent Publication No. 1-501344. A generator, an adaptive filter that generates an inverted sound signal that has an opposite phase and the same amplitude as the reference signal generated by this reference signal, and a vehicle interior that receives the inverted sound signal that is generated by this adaptive filter. And a speaker that produces a reversal sound and are placed in the vehicle interior where noise should be reduced.
A microphone that detects air vibrations at the location, and an LM that sequentially updates the filter coefficient of the adaptive filter so that the sound detected by the microphone is reduced.
An S (Least Mean Square Method) algorithm is known.

That is, the reference signal generator detects an ignition pulse signal corresponding to engine vibration, and generates a reference signal as a digital signal from the ignition pulse signal. This reference signal is input to the adaptive filter, and the gain and phase of the reference signal are adjusted in this adaptive filter, so that the engine noise and the sound generated by the speaker cancel each other at the microphone placement position. A signal is generated, the inverted sound signal is output to the speaker, and the inverted sound is output from the speaker.

Further, the reference signal is also input to the LMS algorithm calculating means, and in this calculating means, the filter coefficient of the adaptive filter is sequentially updated and optimized so that the level of the signal output from the microphone becomes low. It is supposed to do.

[0005]

By the way, in such a vibration reduction device, a vibration reduction signal is generated based on the transfer characteristic of vibration from the vibration means such as a speaker to the vibration detection means such as a microphone at the vibration reduction location. Since it is generated, in order to always obtain a good vibration reduction effect, it is necessary to accurately identify the data of the transfer characteristic under various changing conditions.

That is, for example, the transmission characteristics of the above-mentioned vibrations change due to the opening and closing of windows and changes in the seating condition of occupants in automobiles. On the other hand, when the transfer characteristic data is constant, the optimum vibration reduction signal is generated. Can not
Not only the vibration reduction performance is deteriorated, but in extreme cases, there is a possibility that the vibration is increased due to the reverse vibration output from the speaker.

In identifying the transfer characteristic data,
For example, a test vibration may be generated from a speaker and the transfer characteristic data may be identified based on this test vibration. In that case, however, it is necessary to generate the test vibration from the speaker or the like each time the transfer characteristic data is identified. There is.

The present invention has been made in view of the above points, and an object thereof is to improve the configuration of a control system,
It is possible to properly identify the vibration transfer characteristic data from the vibrating means to the vibration detecting means such as the microphone at the vibration reducing portion without generating the test vibration from the vibrating means such as the speaker. It is to ensure effective vibration reduction control even if the transfer characteristic changes.

[0009]

In order to achieve the above object, in the invention of claim 1, a vibration reducing signal output to a vibrating means such as a speaker and a vibration detecting means such as a microphone at a vibration reducing portion. It is decided that the transmission characteristic data of the vibration between the vibrating means and the vibration detecting means is corrected from the original characteristic data based on both signals using the input signal from the.

Specifically, in the invention of claim 1, as shown in FIG. 1, the vibrating means 2 such as a speaker for generating vibration is used.
And a vibration detecting means 1 such as a microphone which is disposed at a predetermined vibration reducing location and detects vibration at the vibration reducing location.
And a vibration reduction signal having a phase opposite to the vibration signal from the data of the vibration signal of the predetermined frequency component of the vibration from the vibration source detected by the vibration detection means 1 between the vibration means 2 and the vibration detection means 1. And a vibration reduction signal generating means F for generating the vibration reduction signal generated by the vibration reduction signal generating means F to the vibrating means 2 to generate a reverse vibration from the vibrating means 2. It is premised on a vibration reducing device that reduces the vibration detected by the vibration detecting means 1 by generating the vibration.

Further, based on the output signal to the vibrating means 2 and the input signal from the vibration detecting means 1, the vibration between the vibrating means 2 and the vibration detecting means 1 in the vibration reduction signal generating means F. Transfer characteristic correcting means 1 for correcting transfer characteristic data of
1 is set.

According to the second aspect of the present invention, the transfer characteristic correcting means 11 is configured to gradually correct the transfer characteristic data of the vibration between the vibrating means 2 and the vibration detecting means 1. To do.

According to the third aspect of the present invention, the vibration is a vibration having a predetermined frequency component synchronized with the operation of the vibration source.
Also, based on the vibration of this synchronized predetermined frequency component,
A transfer characteristic estimating unit 12 is provided for estimating transfer characteristic data of vibration between the vibration unit 2 and the vibration detecting unit 1 for vibration of frequency components other than the predetermined frequency component.

[0014]

With the above construction, in the invention of claim 1, when the vibration is reduced at the vibration reducing portion, the vibration at the vibration reducing portion is detected by the vibration detecting means 1, and the vibration reducing signal generating means F detects the vibration. From the data of the vibration signal of the predetermined frequency component of the vibration from the vibration source detected by the means 1, the vibration reduction signal having the opposite phase to the vibration signal is based on the vibration transfer characteristic data between the vibration means 2 and the vibration detection means 1. The vibration reducing signal generated by the vibration reducing signal generating means F is output to the vibrating means 2 so that the inverted vibration is generated from the vibrating means 2. The reversal vibration from the vibrating means 2 cancels out with the vibration at the vibration reducing portion, and the vibration detected by the vibration detecting means 1 is reduced.

Then, the transfer characteristic correction means 11 detects the vibration means 2 and the vibration in the vibration reduction signal generation means F based on the output signal to the vibration means 2 and the input signal from the vibration detection means 1. The vibration transfer characteristic data with the means 1 is corrected. By correcting the transfer characteristic data in this manner, the vibration transfer characteristic data of the vibrating means 2 and the vibration detecting means 1 can be properly identified without requiring test vibration.
It is possible to ensure the optimal generation of the vibration reduction signal.

According to the second aspect of the present invention, since the transfer characteristic correcting means 11 gradually corrects the transfer characteristic data of the vibration between the vibrating means 2 and the vibration detecting means 1, the operating state of the vibration source changes. Even so, it can be dealt with well.

According to the invention of claim 3, the transfer characteristic estimating means 1 is provided.
2, the transfer characteristic data of the vibration between the vibration applying means 2 and the vibration detecting means 1 for the vibration of the frequency component other than the predetermined frequency component is obtained based on the vibration of the predetermined frequency component synchronized with the operation of the vibration source. Presumed. By doing so, even if the transfer characteristic data of vibration for the vibration of the frequency component other than the predetermined frequency component is missing, the transfer characteristic data for the frequency component can be complemented well.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings starting from FIG.

(Embodiment 1) FIG. 8 shows the overall structure of a vibration reducing apparatus according to Embodiment 1 of the present invention. This vibration reducing apparatus has a vehicle interior 22 to be subjected to vibration reducing control, as will be described later. M as a vibration detecting means arranged at a noise reduction location (vibration reduction location) inside to detect vibration (sound) of air
The microphones 1, 1, ... And L speakers 2, 2, ... As a vibrating unit that is arranged at a predetermined position in the vehicle compartment 22 and vibrates air to generate sound in the vehicle compartment 22. , And these microphones 1, 1, ... And speakers 2, 2 ,.
And a controller 3 connected to each of the microphones 1, and each microphone 1 produces a synthetic sound of a noise transmitted from the engine 13 (see FIG. 9) as a vibration source into the vehicle interior 22 and a sound emitted from each speaker 2. Detect and microphone 1
Outputs the microphone signals e1 to eM to the controller 3. Speaker output signals y1 to be output to each speaker 2
yL is a reversal sound signal (vibration reduction signal) having a phase opposite to that of the engine noise, and this is the ignition pulse detector 5
A signal called a reference signal output from the engine rotation cycle measurement circuit 6 that measures the engine rotation cycle based on the ignition pulse of the engine 13 detected in
It is obtained by passing it through the digital filters F1 to FL as the vibration reduction signal generating means in the controller 3.

The controller 3 is composed of a CPU for generating the output signals y1 to yL to the speakers 2 by operating the digital filters F1 to FL.
The adaptive algorithm unit 4 in the controller 3 minimizes the sum of squares of the synthetic sound signals detected by the microphones 1 to the digital filters F1 to F1.
The FL parameters are automatically adjusted. As an algorithm for this adjustment, for example, LMS (= Least Mean S
quare method), and by this adjustment, output signals y1 to yL to each speaker 2 are generated so that noise detected by each microphone 1 is reduced based on the reference signal from the engine rotation cycle measurement circuit 6. To do.
Note that the reference signals are digital filters H11 to
The signals are input to the adaptive algorithm unit 4 via the HLM, and the filters H11 to HLM are models of transfer characteristics between the Lth speaker 2 and the Mth microphone 1, and by this, the engine An inverted sound signal having a phase opposite to that of the noise is generated according to sound transfer characteristic data between the speakers 2 and the microphones 1.

Since the signal processing in the controller 3 is performed by digital calculation, similar microphone amplifiers 7, 7, ... And A / D converters 8, 8, ... Are provided at the input stages of the microphone signals e1 to eM. Further, D / A converters 9, 9, ... And speaker amplifiers 10, 10, .. .. which are linear amplifiers are provided at the output stages of the speaker output signals y1 to yL, respectively, and are output from the engine rotation cycle measuring circuit 6. The reference signal is input to the controller 3. The microphone signals e1 to eM, which are analog signals output from the microphones 1, are amplified by the microphone amplifiers 7, digitally converted by the A / D converters 8 and input to the controller 3. Further, the speaker output signals y1 to yL of digital values output from the controller 3 are converted into analog signals by the D / A converter 9, respectively, and then amplified by the speaker amplifier 10 and output to the speakers 2. There is.

FIG. 9 concretely shows the layout of the above-mentioned devices 1, 2, 3, 5 in a vehicle.
Is a vehicle body, 22 is a vehicle compartment provided in a central portion of the vehicle body 21, 23 is an engine room provided in a front portion of the vehicle body 21 to accommodate the engine 13, and 24 and 25 are doors before and after opening and closing the vehicle compartment 22. A pair of left and right front seats 27, 27 are installed on the front side in the vehicle compartment 22, and a rear seat 28 is installed on the rear side. Reference numeral 29 is a steering wheel. Left and right sides of the headrest 27a in each front seat 27 (positions close to the ears of an occupant seated in the front seat 27), and left and right headrests 28a, 28a of the rear seat 28 (ear of the occupant seated on both sides of the rear seat 28). Are positioned as noise reduction points (vibration reduction points), and a total of four microphones 1, 1, ... Are attached to these points (when M = 4), and these microphones 1, 1 ,.
Thus, the sound in the passenger compartment 22 of the automobile is detected near the ears of the occupant.

Further, the number of speakers 2 for generating sound in the vehicle compartment 22 is five (when L = 5), and the left and right center of the instrument panel 26 at the front end of the vehicle compartment 22 and the left and right front doors 24, 24 are provided. The speakers 2, 2, ... Are arranged on the inner side surface of the passenger compartment 22 and on the left and right sides of the package tray portion at the rear end of the passenger compartment 22, and are also used for audio.

The ignition pulse detector 5 is arranged in the engine room 23 and ignites from the primary side of the IG coil 15 which sends an ignition voltage to the ignition plug 13a of each cylinder of the engine 13 via the distributor 14. A signal is detected, and a reference signal is generated based on the output of the signal to control the engine noise that changes according to the operating state of the engine 13 as noise.

The controller 3 for outputting a speaker output signal to the above-mentioned speakers 2, 2, ... Is a left front seat 28 on the passenger side.
It is arranged in the instrument panel 26 in the front. Further, in the controller 3, an operation switch 30 for switching the operation of the noise control system and the audio system by the controller 3 is arranged, for example, on the roof portion of the vehicle compartment.

Here, the signal processing operation for identifying the transfer characteristic data of the sound between each speaker 2 and each microphone 1 in the controller 3 will be described with reference to the flow charts of FIGS. This process is basically performed according to FIG. That is, first, in step S1, a frequency component not synchronized with the engine speed is removed from the microphone signal output from each microphone 1,
In the next step S2, the impulse response data of the sound between each speaker 2 and each microphone 1 is corrected to correct the transfer characteristic data of the sound between them, and thereafter, based on the impulse response data in step S3. Interpolation eliminates missing data.

The details of the signal processing performed in steps S1 to S3 are as shown in FIGS. In the frequency component removal processing of step S1, as shown in FIG. 2, first, the engine speed r is input in step S11, and in the next step S12, the number N of data equal in length to twice the engine rotation cycle is calculated. Calculate from the following formula. sf is a sampling period. N = sf * (60 / r) * 2 Then, in step S13, the microphone signal e (t-n).
Two ring-shaped data structures R (n), R ′ of length N
(N) (where 0 ≦ n ≦ N) is input, and so-called moving average processing is performed on the one ring-shaped data structure R ′ (n) in step S14. After that, in step S15, the difference between the other ring-shaped data structure R (n) and the one ring-shaped data structure R '(n) subjected to the moving average processing is set as a new microphone signal e (t-n). The microphone signal e (t-n) is the original signal with the components not synchronized with the engine rotation removed.

In the impulse response data correction processing in step S2, as shown in FIG.
In step S22, the microphone signal e (t) is input in step 21.
Then, the microphone signal e (t) is Fourier transformed to obtain a microphone signal spectrum function E (ω). Next, in step S23, the speaker output signal y (t) is similarly Fourier-transformed to obtain the output signal spectrum function Y (ω), and in the next step S24, the impulse response data h
Fourier transform of (t) and speaker / microphone transfer function H
Get (ω). Then, in step S25, the speaker / microphone transfer function H (ω) is corrected by the following equation to obtain a corrected speaker / microphone transfer function H ′ (ω). H ′ (ω) = H (ω) − {E (ω) / Y (ω)} In the final step S26, the corrected speaker / microphone transfer function H ′ (ω) is inverse Fourier transformed to obtain a new impulse response. Obtain the data h (t).

Further, the data loss interpolation processing in step S3 is performed as shown in FIG. First step S31
And the new impulse response data h (t) obtained above
Fourier transform of the speaker / microphone transfer function H (ω)
After obtaining, the engine speed r is input in step S32. Next, in step S33, the engine rotation frequency R is calculated from the equation R = r / 60. In the next step S34, as shown in FIG. 6, ω = n · R (where n is an integer)
Using the value of the speaker / microphone transfer function H (ω) that becomes, the transfer function H of another frequency ω ′ (broken line in FIG. 6)
(Ω ′) is obtained by an interpolation method (curve fit), and then, in step S35, this speaker / microphone transfer function H (ω ′) is subjected to inverse Fourier transform to obtain new impulse response data at another frequency ω ′. Get h (t).

In this embodiment, each speaker output signal y is obtained by the above step S2 or steps S21 to S26.
Based on (t) and the microphone signal (t), each speaker 2 and each microphone 1 in the controller 3 (noise reduction location)
The transfer characteristic correction means 11 is configured to correct the transfer characteristic data of the sound between and.

Further, step S3 or step S31-
By S35, based on the engine noise having the predetermined frequency component n · (r / 60) synchronized with the engine rotation, each speaker 2 and each of the noises of the frequency components other than the predetermined frequency component n · (r / 60) are A transfer characteristic estimating unit 12 is configured to estimate transfer characteristic data of sound with the microphone 1.

Therefore, in the above embodiment, when the noise control system is operated by the operation switch 30, the ignition signal detected by the ignition pulse detector 5 is input to the controller 3 and the engine rotation cycle measuring circuit 6 is provided. A reference signal is generated at. Also,
Noises at noise reduction points near the occupants' ears in the passenger compartment 22 are detected by the respective microphones 1 in the passenger compartment 22, and the microphone signals e1 to eM, which are analog signals output from the respective microphones 1, similarly, After being respectively amplified by the microphone amplifiers 7, 7, ..., The A / D converters 8, 8,
Is digitally converted by ... And input to the controller 3. Furthermore, the reference signal passes through the digital filters F1 to FL in the controller 3, and as a result, the speaker output signals y1 to yL for reducing the noise detected by each microphone 1 correspond to the order of engine rotation. An inverted sound signal having the same amplitude as the engine noise having a frequency component and having the same phase is generated based on the transfer characteristic data of the sound between each speaker 2 and each microphone 1, and the speaker output signals y1 to y1 which are the digital signals are generated. The yL is converted into an analog signal by the D / A converters 9, 9, ..., Amplified by the speaker amplifiers 10, 10 ,. Then, the reversal sound from the speakers 2, 2, ... And the engine noise cancel each other out at a noise reduction portion near the ears of the occupant,
This reduces the noise detected by the microphones 1, 1, ... At the noise reduction location.

During the execution of such noise reduction control, the transfer characteristic data of the sound between each speaker 2 and each microphone 1 at the noise reduction location is corrected from the initial data. That is, the frequency transfer function H (ω) between the speaker and the microphone is obtained from the already used speaker / microphone impulse response data h (t), and this transfer function H (ω) is the microphone signal (t).
Spectrum of (noise signal remaining without being muted at each microphone 1) and speaker output signal y (t)
The new transfer function H '(ω) by the ratio with the spectrum of
Is corrected, and the corrected transfer function H ′ (ω) is converted into impulse response data h (t) again for use. In this way, the sound transfer characteristic data between the speaker 2 and the microphone 1 is corrected from the existing data based on the speaker output signal y (t) and the microphone signal (t). It is possible to properly identify the transfer characteristic data of the sound between the speaker 2 and the microphone 1 without requiring, and to secure the optimum generation of the inverted sound signal.

Further, the impulse response data newly obtained in this way is converted into the speaker / microphone transfer function H (ω), and the value of the speaker / microphone transfer function H (ω) such that ω = n · (r / 60) is obtained. Based on this, the same transfer function H (ω ') at another frequency ω'is obtained by the interpolation method, and the new impulse response data at another frequency ω'is obtained by the conversion of this speaker / microphone transfer function H (ω'). h (t) is obtained. As described above, based on the engine noise of the predetermined frequency component synchronized with the engine rotation, the sound transfer characteristic data between the speaker 2 and the microphone 1 for the engine noise of the other frequency component not synchronized with the engine rotation is interpolated. Therefore, even if sound transfer characteristic data for frequency components other than the predetermined frequency component is missing in the engine noise, the data of the frequency component can be complemented well, and the speaker 2 and the microphone for noise for all frequency components can be obtained. It is possible to properly identify the transfer characteristic data of the sound between 1 and 1.

The impulse response data (transfer characteristic data) may be corrected little by little. That is, FIG. 7 shows a modified example of the transfer characteristic correction means 11 '(note that the same parts as those in FIG. 3 are designated by the same reference numerals and detailed description thereof will be omitted). Do the same. Then, the different process is step S2.
5 ′, the microphone signal spectrum function E (ω) obtained by Fourier transforming the microphone signal e (t) and the output signal spectrum function Y (obtained by Fourier transforming the speaker output signal y (t). ω), when correcting the speaker / microphone transfer function H (ω), a coefficient μ (where 0 <μ <
The following equation with 1) is used. H ′ (ω) = H (ω) −μ · {E (ω) / Y (ω)} In this case, the speakers 2, 2, ... And the microphone 1,
Since the sound transmission characteristic data between the speakers 1, 2, ... Is gradually corrected, even if the engine speed changes, the speaker 2, 2 ,.
It is possible to properly identify the transfer characteristic data of the sound between and.

(Second Embodiment) FIGS. 10 to 12 show a second embodiment of the present invention. In the first embodiment, the vibration detecting means is the microphone 13 and the vibrating means is the speaker 14, whereas in this embodiment, the vibration detecting means is an acceleration sensor and the vibrating means is an engine mount. .

That is, in this embodiment, as shown in FIG. 10, the engine 13 is supported on the vehicle body 1 by a plurality of (L) mounts 40, 40, ... (Only one is shown). Each of the mounts 40 has a flange 41a at the upper end as shown in the enlarged detail of FIG.
Side lower base member 41 fixed to the side, upper cylindrical mounting member 42 mounted on the engine 13 side, and lid member 43 for sealing the upper end of this mounting member 42.
And a frustoconical partition plate 4 connected and fixed to the flange 41a of the base member 41 by a flange 44a at the lower end.
4 and an inverted umbrella-shaped elastic member 45 for connecting the outer peripheral surface of the partition plate 44 to the lower end portion of the mounting member 42 in a liquid-tight manner, and the bottom portion of the base member 41 includes the frame of the vehicle body 21. A mounting bolt 46, which is fixed by penetrating to, is fixed. In addition, the flange 41a of the base member 41 and the partition plate 4
A diaphragm 49 that divides the space between the base member 41 and the partition plate 44 into an upper diaphragm chamber 47 and a lower chamber 48 is sandwiched between the four flanges 44a. Further, an orifice 51 that connects the diaphragm chamber 47 and the main chamber 50 surrounded by the cylindrical mounting member 42 and the elastic member 45 is formed in the center of the partition plate 44, and the diaphragm chamber 47 and the main chamber 50 are connected to each other. Is filled with hydraulic fluid.

Each mount 40 contains an actuator 52 for vibrating the mount 40. That is, the actuator 52 is provided with a vibrating plate 53 made of a magnetic disc, and the vibrating plate 53 is located at a position above the inner peripheral surface of the mounting member 42 at a predetermined distance from the lower surface of the lid member 43. Is mounted and supported in an airtight manner so as to be movable up and down via a circular elastic member 54, and has a cylindrical mounting member 42 and a lid member 43.
A space surrounded by the elastic member 45 is divided into a lower main chamber 50 and an upper chamber 55 by a vibrating plate 53.

A magnetic plate 56 is arranged on the lower surface of the lid member 43 so as to face the vibrating plate 53, and the electromagnetic coil 5 for demagnetizing the magnetic plate 56 is provided on the lid member 43 around the magnetic plate 56.
7 is buried. This electromagnetic coil 57 is connected to the controller 3, and by supplying an actuator output signal from the controller 3 to the electromagnetic coil 57,
The vibrating plate 53 is vibrated with the same amplitude in the opposite phase with respect to the vibration input from the engine 13 to the mount 40 to generate vibration in the hydraulic fluid and vibrate the mount 40.

Further, as shown in FIG. 10, at a predetermined position of the vehicle body 21, a plurality of (M) acceleration sensors 6 as vibration detecting means for detecting the vibration in the predetermined direction as acceleration.
0, 60, ... (Only one is shown) are installed, and the output signal of each acceleration sensor 60 is input to the controller 3.

The configuration of the controller 3 is the same as that of the first embodiment.
As shown in FIG. 12, the engine rotation cycle measurement circuit 6 that generates and outputs a reference signal, and the reference signal output from the engine rotation cycle measurement circuit 6 are processed to actuate the actuator of each mount 40. 5
The digital filters F1 to FL for generating the actuator output signals y1 to yL to the second motor 2 and the reference signal from the engine rotation cycle measuring circuit 6 are digital filters H1 to H2.
Each acceleration sensor 60 is input via 11 to HLM.
An adaptive algorithm unit 4 for automatically adjusting the parameters of the digital filters F1 to FL so that the sum of squares of the vibration signals detected by
, Which amplify the signals e1 to eM from
A / D converters 8, 8, ... For converting these signals e1 to eM into digital signals, and actuator output signals y1 to yL
, Which converts the signal into an analog value, and an amplifier 1 which amplifies the actuator output signals y1 to yL
0, 10, ..., The actuator output signals amplified by the amplifiers 10 are output to the actuators 52 of the mounts 40, respectively. Other configurations are the same as those in the first embodiment.

Therefore, in the case of this embodiment, in the vibration reduction control state, the vibration of the vehicle body 21 by the engine 13 is detected by each acceleration sensor 60, and the output signal of each acceleration sensor 60 is input to the controller 3. In this controller 3, an actuator output signal for reducing the vibration detected by each acceleration sensor 60 is generated, and this actuator output signal is sent to each mount 40.
Output to the actuator 52 of the mount 40, and the inversion vibration having the same amplitude as that of the engine vibration having the frequency component corresponding to the order of the engine rotation is generated from each of the mounts 40. Cancel each other out, and this allows each acceleration sensor 60 to
The engine vibration detected by is reduced.

During the execution of such vibration reduction control, the vibration transfer characteristic data between the actuator 52 of each mount 40 and each acceleration sensor 60 at the vibration reduction location is corrected from the initial data. That is, as in the first embodiment, the mount 4 for engine vibration of other frequency components not synchronized with the engine rotation based on the engine vibration of the predetermined frequency component synchronized with the engine rotation.
The transfer characteristic data of the vibration between the actuator 52 of 0 and the acceleration sensor 60 is obtained by the interpolation method. As a result, even if the transmission characteristic data of the vibration for the frequency components other than the predetermined frequency component is missing in the engine vibration, the data of the frequency component can be satisfactorily complemented, and the actuator of the mount 40 against the vibration for all the frequency components. It is possible to properly identify the transfer characteristic data of the vibration between the 52 and the acceleration sensor 60.

In the second embodiment, as shown in FIG. 13, the microphone 1 as in the first embodiment may be used instead of the acceleration sensor 60, and the same effect can be obtained.

Further, although the vibration source is the engine 13 of the automobile in each of the above-mentioned embodiments, the present invention can be applied to the case of reducing other vibrations such as road noise and exhaust noise of the engine 13 in the automobile. Further, it can be applied to the case where the vibration from other vibration source than the automobile is actively reduced and controlled.

[0046]

As described above, according to the first aspect of the invention, the inversion vibration having the opposite phase to the vibration of the vibration source is generated from the vibrating means and the vibration detecting means at the vibration reducing portion. In the case of reducing the vibration at the vibration reducing portion by generating it according to the transfer characteristic data of the vibration between the By correcting the vibration transfer characteristic data with the detecting means, the vibration transfer characteristic data between the vibrating means and the vibration detecting means can be properly identified without requiring the test vibration for identification. Thus, it is possible to ensure generation of an optimum vibration reduction signal and ensure effective vibration reduction control even if the transfer characteristic of vibration changes.

According to the second aspect of the present invention, since the transfer characteristic data is gradually corrected, even if the operating state of the vibration source changes, it can be coped with well. It is possible to reliably achieve the vibration reduction effect when the engine speed changes.

According to the invention of claim 3, when the vibration is a vibration having a predetermined frequency component synchronized with the operation of the vibration source, based on the vibration of the synchronized predetermined frequency component, other than the predetermined frequency component. By estimating the transfer characteristic data of the vibration between the vibration means and the vibration detecting means for the vibration of the frequency component, the transfer characteristic data of the vibration for the vibration of the frequency component other than the predetermined frequency component is missing. However, the data can be satisfactorily complemented, and the vibration transfer characteristic data between the vibration applying means and the vibration detecting means can be properly identified for all frequency components of the vibration.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a flow chart diagram showing a signal processing operation for removing a frequency component that is not synchronized with the engine speed from the microphone signal in the first embodiment of the present invention.

FIG. 3 is a flowchart showing a signal processing operation for correcting sound transfer characteristic data between each speaker and a microphone.

FIG. 4 is a flowchart showing a signal processing operation for obtaining data of a frequency component that is not synchronized with the engine speed.

FIG. 5 is a flowchart showing a processing operation for identifying transfer characteristic data of sound between each speaker and a microphone.

FIG. 6 is an explanatory diagram showing the concept of data replenishment for a data missing portion.

FIG. 7 is a diagram corresponding to FIG. 3 showing a modified example of the signal processing operation by the transfer characteristic correction means.

FIG. 8 is a block diagram showing an overall configuration of a vibration reduction device.

FIG. 9 is a plan view schematically showing an arrangement configuration of each device in an automobile.

FIG. 10 is a side view showing an overall configuration of a vibration reduction device according to a second exemplary embodiment.

FIG. 11 is an enlarged sectional view of the mount.

FIG. 12 is a view corresponding to FIG. 8 showing the second embodiment.

FIG. 13 is a view corresponding to FIG. 10 and showing a modified example of the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Microphone (vibration detection means) 2 Speaker (vibration means) 3 Controller 4 Adaptive algorithm part 11, 11 'Transfer characteristic correction means 12 Transfer characteristic estimation means 13 Engine (vibration source) 21 Vehicle body 22 Vehicle compartment 40 Mount 52 Actuator (addition Shaking means) 60 Acceleration sensor (vibration detecting means) F1 to FL digital filter (vibration reducing signal generating means) y1 to yL, y (t) output signal (vibration reducing signal) e1 to eM, e (t) signal

Claims (3)

[Claims] 1. A vibrating means for generating a vibration, a vibration detecting means arranged at a predetermined vibration reducing location for detecting vibration at the vibration reducing location, and a vibration source detected by the vibration detecting means. Vibration reduction signal generation means for generating a vibration reduction signal having a phase opposite to that of the vibration signal from the vibration signal of the predetermined frequency component of the vibration based on the vibration transfer characteristic data between the vibration means and the vibration detection means. By outputting the vibration reduction signal generated by the vibration reduction signal generating means to the vibration applying means to generate the inverted vibration from the vibration applying means,
In a vibration reducing device for reducing the vibration detected by the vibration detecting means, the vibrating means in the vibration reducing signal generating means is based on an output signal to the vibrating means and an input signal from the vibration detecting means. A vibration reduction device comprising a transfer characteristic correction means for correcting the transfer characteristic data of vibration between the vibration detecting means and the vibration detecting means. 2. The vibration reducing device according to claim 1, wherein the transfer characteristic correcting means is configured to gradually correct the transfer characteristic data of the vibration between the vibrating means and the vibration detecting means. Vibration reduction device. 3. The vibration reducing device according to claim 1, wherein the vibration has a predetermined frequency component that is synchronized with the operation of the vibration source, and the predetermined frequency component is based on the vibration of the synchronized predetermined frequency component. A vibration reducing device, characterized in that a transfer characteristic estimating means for estimating transfer characteristic data of vibration between a vibration applying means and a vibration detecting means for vibrations of frequency components other than is provided.