JP3348875B2 - Vibration noise control device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration and noise control apparatus for a vehicle, and more particularly, to a vibration and noise control apparatus for a vehicle capable of actively controlling vibration and noise generated by running of a vehicle and reducing such vibration and noise. The present invention relates to a noise control device.

[0002]

2. Description of the Related Art In recent years, adaptive digital filters (Adaptive Digital Filters) have been developed.
Digital Filters (hereinafter referred to as "ADFs") have been actively developed in various fields to attenuate the vibration noise generated from the vibration noise source and reduce the vibration noise. ing.

[0003] Among these various types of active vibration noise control devices, an active vibration noise control device developed for vehicles such as automobiles is provided with a predetermined pulse signal (trigger signal) relevant to driving of a power plant. The applicant of the present application has already proposed a vibration and noise control apparatus which inputs the signal to an adaptive control circuit and performs adaptive control on the periodic or pseudo-periodic vibration noise by a first filter means comprising an ADF (Japanese Patent Application No. Hei 10-26139). 4-88075) (hereinafter referred to as "first prior art").

According to the first prior art, since the pulse signal is directly input to the adaptive control circuit, complicated product-sum operation is reduced, and the convergence speed for reducing vibration noise is improved. Can be. Further, according to the first prior art, the pulse signal is input at a predetermined interval according to the operating state of the engine and adaptive control is performed according to the predetermined interval. It can be performed.

Further, according to the first prior art, since the sampling period is made variable in accordance with the detection timing of the pulse signal, a power plant in which the vibration noise waveform changes greatly due to engine rotation fluctuations or the like. On the other hand, the sampling period changes in accordance with the rotation fluctuation and the like, so that the adaptive following speed is high, and highly accurate adaptive control can be performed.

[0006] The applicant of the present application has set out to maintain good followability even when the vibration noise waveform of the input signal changes suddenly in a very short period of time.
A vibration and noise control device for a vehicle, which is an improvement on the first prior application, has already been proposed (Japanese Patent Application No. 4-118281).
(Hereinafter, referred to as “second prior application technology”).

According to the second prior art, an adaptive digital filter having the number of taps of "1" is provided on the output side of the first filter means, and the adaptive digital filter outputs the signal from the first filter means. By performing the change rate (gain) correction on the output control signal, the control signal from the first filter unit is appropriately corrected, and the vibration noise transmission characteristics can be quickly corrected even during the transient operation state of the power plant. Therefore, it is possible to perform the vibration noise control with good followability.

Further, when the active vibration noise control device is applied to a vehicle such as an automobile, it is necessary to correct a change in transmission characteristic phase of the system caused by the vibration noise transmission path.
In the second prior art, a second filter is provided in the adaptive control circuit, and the first filter is controlled in consideration of a reference signal output from the second filter in accordance with a change in a sampling period. The filter coefficient is being updated.

Further, in the above prior art, the filter coefficient of the second filter means is calculated by a predetermined arithmetic program, and then the filter coefficient is sequentially added at a predetermined cycle, thereby obtaining a W filter. A pseudo-periodic sequence of the second filter means corresponding to a tap length is created.

[0010]

However, in the first and second prior arts, the reference signal output from the second filter means is a plurality of reference signals stored in the second filter means. The optimum transfer characteristic is selected from the transfer characteristics of the second filter means, or the higher-order transfer characteristic stored in advance in the second filter means is divided to calculate the optimum transfer characteristic, and the transfer characteristic thus selected or calculated is used. ing. That is, the transfer characteristics of the system pre-stored in the second filter means change with time (deterioration) or environmental change (change in ambient temperature).
Can not follow the change in transfer characteristics due to
There is a new problem that the filter coefficient of the first filter means may not be updated properly.

In the first and second prior arts, it is necessary to identify the transmission characteristics of the vibration and noise transmission path with high precision in advance. However, it is inefficient to perform the identification work on all vehicles. In practice, the transmission characteristics are identified with a specific vehicle as a representative vehicle, and the transmission characteristics thus identified are mounted on other vehicles, so that the production quality of the vehicles varies, and the specifications of the vehicles are changed. -There was a problem that it was not possible to cope with fluctuations in the transfer characteristics due to the equipment and further the usage conditions of the driver.

Further, in the first and second prior arts, the selection or calculation of the optimum transfer characteristics requires a complicated program operation, and not only takes time to identify such optimum transfer characteristics, but also the control. There is a problem that the calculation load in the system also increases.

Further, in the first and second prior arts, a plurality of pulse signals specific to each component of the vibration noise source are input to the first filter means. Is created by a multiplier circuit, etc.
It is necessary to provide a synchronization monitoring circuit for monitoring the synchronization of the plurality of pulse signals at predetermined timings, which causes a problem that the system becomes complicated.

[0014] Further, in the method of creating a pseudo-periodic sequence of the second filter means according to the prior application, a pseudo-periodic sequence is generated after calculating a filter coefficient of the second filter means. However, since the calculation load is large and the calculation time is relatively long, there is a problem that the convergence speed is slow, and it is difficult to always keep good follow-up to the system.

The present invention has been made in view of such a problem, and can easily and quickly identify a transmission characteristic of a vibration noise transmission path and perform highly accurate adaptive control with a relatively simple system. It is an object of the present invention to provide a vibration noise control device for a vehicle.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides at least one of a vehicle body and a vehicle interior due to a vibration noise source including at least a vehicle driving power plant.
For a periodic or pseudo-periodic vibration noise generated in one or more predetermined regions, a predetermined input signal indicating a vibration noise waveform is filtered to change a transfer characteristic from the vibration noise source to the predetermined region. a first filter means for outputting a control signal for the said control signal
Converts to a drive signal and controls vibration noise by the drive signal
An electromechanical conversion means, an error signal detection means for detecting a vibration noise error signal reduced by a vector sum by an output from the electromechanical conversion means in the predetermined area, the electromechanical conversion means and the error signal detection Second filter means for expressing a transfer characteristic of a vibration noise transmission path formed between the first and second means, a detection result of the error signal detection means, a reference signal output from the second filter means, and the first filter means. A control signal updating unit that updates a filter coefficient of the first filter unit so that the vibration noise error signal has a minimum value based on a filter coefficient of the filter unit. and Rupa pulse signal detecting means for issuing test the Rupa pulse signal to determine the driving period of the vibration noise source, superimposed on the control signal outputted from the pre-Symbol first filter means A sampling cycle determining means for determining a random signal generating means, the sampling period in response to the detection timing of the detected by pre Kipa pulse signal detection means Rupa pulse signal for generating a random signal that, the second with at the sampling period A driving means for controlling a series of operations including an output of the first filter means and an update of a filter coefficient of the first filter means, and
Filter means for outputting a residual signal obtained by removing a periodic signal caused by the vibration noise source from the error signal detected by the error signal detecting means, and a random signal generating means for outputting the residual signal. Transfer characteristic for identifying a transfer characteristic of the vibration noise transmission path based on a random signal, a residual signal output from the periodic signal removing unit, and a filter coefficient of an identification filter provided in the second filter unit. It is characterized by having identification means, and first storage means for storing the transfer characteristics identified by the transfer characteristic identification means .

[0017] The periodic signal removing means, specifically, before
A <br/> third filter means for outputting a periodic signal of opposite phase to the serial predetermined input signal, and the error signal from the periodic signal output from said third filter means and said error signal detecting means A residual signal generating means for generating a residual signal based on
And a periodic signal identifying means for identifying the periodic signal on the basis of Kipa pulse signal and the residual signal and the filter coefficient of the third filter means.

Furthermore, before Kipa pulse signal detecting means, the a first basic pulse signal detecting means for detecting a rotation signal of the flywheel secured to the crankshaft of the power plant, a rotation signal of the crankshaft Second basic pulse signal detection means for detecting at every predetermined minute angle of the crankshaft ;
At least one or more basic pulse signal detecting means among the third basic pulse signal detecting means for detecting a rotation signal of a camshaft of the power plant at every predetermined minute angle of the camshaft. ing.

The present invention also relates to a random signal generated by the random signal generation means and the residual signal generation.
A second storage unit comprising a plurality of storage columns for sequentially storing the residual signal output from the unit for each sampling cycle determined by the sampling cycle determination unit ;
Serial identification filter as characterized by having a plurality of one quasi-periodic row creation hand stage sequentially adds the stored contents to create a quasi-periodic sequence stored in the storage columns of the storage columns I have.

[0020]

According to the above construction, the transmission characteristic of the vibration noise transmission path is identified based on the random signal, the residual signal, and the filter coefficient of the second filter means, and the transmission characteristic is further determined by the second filter means. Is stored in the storage means. Then, the transfer characteristic stored in the storage unit is output from the second filter unit as a reference signal, and a first signal is output based on the reference signal, an error signal from the error signal detection unit, and a filter coefficient of the first filter unit. Are updated.

Further, the filter coefficient of the third filter means constituting the periodic signal removing means is updated based on the predetermined input signal , the residual signal and the current filter coefficient of the third filter means. Also, the output characteristics and the error signal the error signal RaAmane phase signal is removed Toka with residual signal detection means of the third filter means is generated, it said residue difference signal is input to the transfer characteristic identifying means.

The first pulse signal is detected based on any one of the rotation signals of the flywheel, the crankshaft, and the camshaft.

Further, the pseudo-periodic sequence of the second filter means includes a random signal and a residual signal stored in one storage column among random signals and residual signals sequentially stored in a plurality of storage columns for each sampling period. The difference signals are identified by sequentially adding them.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a mounting state of a self-expandable engine mount constituting a vehicle vibration and noise control apparatus according to the present invention on a vehicle body, and an arrangement position of an adder as an error signal detecting means in a vehicle interior. FIG.

That is, reference numeral 1 in the figure denotes a four-cycle engine (hereinafter simply referred to as "engine") of a vehicle driving power plant having, for example, in-line four cylinders. The engine 1 includes an engine mount 2 and front wheels ( The vehicle body 8 is supported by a suspension device 5 of a driving wheel 4 and a support 7 of an exhaust pipe 6.

Further, the engine mount 2 includes an appropriate number of self-expandable engine mounts 2a capable of changing the vibration noise transmission characteristics, and an appropriate number of normal engine mounts 2b capable of not changing the vibration noise transmission characteristics. It is composed of

The self-expandable engine mount 2a includes an actuator such as a voice coil motor (VCM) or a piezoelectric element or a magnetostrictive element, and an electronic mount control unit (EMCU) according to the vibration of the engine.
The vibration of the engine is controlled by a signal from a motor (not shown). That is, the self-expandable engine mount 2a has a liquid chamber filled with liquid, and the vibration noise source (engine 1)
The vibration of the vibration source is controlled to be transmitted to the vehicle body 8 by the actuator via the elastic rubber fixed to the side.

The suspension device 5 and the support 7
Are respectively an appropriate number of self-expandable suspension devices 5a and an appropriate number of self-expandable supports 7a, and an appropriate number of normal suspension devices 5b.
And the appropriate number of supports 7b, and the self-expandable suspension device 5a and the self-expandable support 7a
As in the case of the self-expandable engine mount 2a, the self-contracting engine mount has an actuator,
The vibration of the engine is controlled by a signal from the MCU. Further, a speaker 40 is provided at an appropriate place in the dashboard of the vehicle cabin 9, and the speaker 40 controls noise generated from the engine 1. The self-expandable engine mount 2
a, the suspension device 5a, the support 7a, and the speaker 40 constitute the electromechanical conversion means 50 .

In the vicinity of a flywheel fixed to a crankshaft (not shown) of the engine 1, a rotation detection sensor such as a pulse encoder is provided.

A noise error sensor 10 such as a microphone is provided at a substantially central ceiling in the vehicle compartment 9.
A floor vibration error sensor 11 is provided on the inner floor surface, and a steering vibration error sensor 13 is provided on the steering wheel 12.

The noise error sensor 10, floor vibration error sensor 11, and steering vibration error sensor 13 each constitute a first adder 14.

FIG. 2 is a system configuration diagram showing an embodiment of a vehicle vibration and noise control apparatus according to the present invention.

That is, the ring gear of the flywheel is counted by the rotation detection sensor 15 and the basic pulse signal X
Is generated and the basic pulse signal can be calculated at high speed
(Digital Signal Processor) 16.

On the other hand, the sampling frequency Fs corresponding to the fluctuation of the flywheel, that is, the fluctuation of the engine speed is directly created from the basic pulse signal X and input to the DSP 16, and the DSP 1 is controlled by the sampling frequency Fs.
6 is governed by the sequence of operations performed. Also, DSP
The output signal V output from the D / A converter 1
7, an amplifier 18, while the further input as a self-expanding electromechanical converter 5 0 of the engine mount or the like, the driving signal Z to the first adder 14 through the vibration noise transmission path such body 8, the vibration noise source Is input to the first adder 14. Then, an error signal ε is output from the first adder 14, fed back to the DSP 16 via the A / D converter 19, and
Predetermined adaptive control is executed in SP16 to reduce vibration noise of the vehicle.

[0036] Thus, DSP 16 includes a timing pulse generation section 20 for outputting a timing pulse signal X 'which is synchronized with the specific vibration noise period to each component part of the basic pulse signal X by counting the engine 1, the low amplitude level (For example,
A random signal generating means 21 for generating a random signal having a noise level conversion of 20 dB or less, and removing a random signal in a predetermined frequency band from the random signal L from the random signal generating means 21 to output a random reference signal L ' And the adaptive control unit 23 to which the timing pulse signal X 'and the random reference signal L' are input and perform predetermined adaptive control.

More specifically, the timing pulse generator 20 counts a basic pulse signal X, which is a rotation signal detected by the rotation detection sensor 15, with a counter, and generates a vibration-noise source such as a valve operating system or a crankshaft. Alternatively, the adaptive control unit 2 generates a plurality of types of timing pulse signals X ′ according to the vibration noise characteristics specific to each component of the engine such as the combustion chamber.
Output to 3. That is, in the present embodiment, the vibration order (vibration component) of a piston system or the like that generates regular vibration noise characteristics in synchronization with the rotation of the engine, and the explosion pressure (irregular vibration noise characteristics that generate irregular vibration noise characteristics according to the combustion state) A timing pulse signal X ′ is generated which is divided into a vibration order (vibration component) due to the excitation force). Specifically, a first-order timing pulse signal X 'is generated to indicate the order of vibration of a regular piston system or the like, and a second-order timing pulse signal X' is generated to indicate the order of vibration due to the explosion pressure. You. Here, the case where the vibration order is “primary” means that the timing pulse signal X ′ is generated once every time the crankshaft makes one rotation, and the case where the vibration order is “secondary” means that the crankshaft Means that one pulse is generated for every 0.5 rotation. That is, as shown in FIG.
"CRK signal pulse") is, for example, a crank angle of 30.
° each time the crankshaft makes one revolution.
Two pulses are generated, and the primary pulse is generated once every 12 pulses (one rotation) of the crankshaft, and the secondary pulse is generated once every six pulses (0.5 rotation) of the crankshaft. I do. In the present embodiment, the basic pulse signal X is detected by counting the number of ring gears of the flywheel, and the timing pulse generator 20 outputs the first and second vibration orders for each predetermined count corresponding to the predetermined crank angle.
The next timing pulse signal X 'is output.

As described above, by dividing the vibration order components into a plurality of types and performing adaptive control, vibration noise can be more effectively reduced.

That is, the first-order vibration order relates to a vibration component generated regularly, such as rotation of the crankshaft.
By individually performing adaptive control on only such primary vibration components, it is possible to efficiently reduce vibration noise generated due to inertial force such as engine rotation.

On the other hand, since an explosion stroke is executed once per cylinder during two revolutions of the crankshaft, in the case of a four-cylinder engine, there are four explosion strokes during two revolutions of the crankshaft. The second order indicates a vibration component related to the explosion pressure.

Then, adaptive control is performed by classifying the secondary vibration order component related to the explosion pressure having the irregular vibration noise characteristic into the primary vibration order component having the regular vibration noise characteristic. In addition, vibration noise can be more effectively reduced.

Since the timing pulse generator 20 counts the basic pulse signal X and detects a desired timing pulse signal X 'at every predetermined timing, a complicated frequency dividing / multiplying circuit is required. Therefore, a plurality of types of vibration order components can be easily created. Also,
For example, the vibration order component needs to be generated in synchronism with each other for one revolution of the crankshaft between the primary pulse and the secondary pulse, but the timing pulse signal X ′ is counted by the counter in the timing pulse generator 20. Since the detection is performed, the necessity of a complicated synchronization monitoring mechanism is eliminated, and the robustness (robustness) is improved and the apparatus can be simplified.

Further, the adaptive control section 23 specifically includes two adaptive control circuits 2 so that adaptive control processing is separately performed on the two types of timing pulse signals X 'described above.
4 ₁ and 24 ₂ , and furthermore, adaptive control circuits 24 ₁ and 24 ₂
Is input in synchronization with the generation of the timing pulse signal X '.
Filtering of noise and vibration waveforms (predetermined input signals)
Finite impulse response (Finite Impulse Respons
e: Wiener filter (hereinafter, referred to as “W filter”) 25 ₁ as an ADF of the “FIR” type, hereinafter,
25 ₂ (first filter means) and the least mean square method (Lea
st Mean SquareMethod: less, W filters 25 ₁ using) called "LMS method", 25 ₂ of the SFX-LMS performing arithmetic processing for updating the filter coefficients (Synchroniz
ed Filtered-X-LMS) processing units 26 ₁ , 26 ₂ (control signal update
Means) and the vibration noise waveform generated by the electromechanical conversion means 50, the vehicle body 8 and the like disposed in the vibration noise transmission path .
Correction filter units 27 ₁ and 27 ₂ ( _second filter unit) that correct the phase of the transfer characteristic of control signal Y from W filters 25 ₁ and 25 ₂ in accordance with a change in phase (including amplitude; the same applies hereinafter).
Stage) .

As shown in FIG. 4, the correction filter section 27 controls the timing pulse signal X 'and the A / D converter 1
9, a periodic signal removing unit 28 that removes a periodic signal having a large amplitude based on the error signal ε from the signal 9 and outputs a first residual signal η; the first residual signal η; A transfer characteristic identification unit 29 for identifying a transfer characteristic and a register unit 30 ( first storage unit ) for storing the transfer characteristic identified by the transfer characteristic identification unit are provided.

Further, the periodic signal removing means 28, more specifically, receives the timing pulse signal X 'and cancels out the opposite phase with respect to the vibration noise waveform regulated by the generation interval of the timing pulse signal X'. An echo canceler filter (hereinafter, referred to as “E filter”) 31 (third filter means) composed of an ADF that outputs a signal ρ (periodic signal) , and the canceling signal ρ and an error signal ε from the A / D converter 23. And a second adder 32 (residual signal generating means) for outputting a first residual signal η and performing an operation for updating the filter coefficient of the E filter 31.
LMS (Synchronized-LMS) processing unit 33 (periodic signal identification
Means) . And the E filter 31
Are updated based on the timing pulse signal X ′, the first residual signal η, and the current filter coefficient of the E filter 31, and the cancellation signal ρ output from the E filter 31, that is, the periodic signal is identified. Is done.

The transfer characteristic identification means 29 is a transfer characteristic identification filter (hereinafter referred to as "C filter") 34 to which the random reference signal L 'from the band-pass filter 19 is input, and is converted into a negative value. A third adder 35 to which the output signal τ from the C filter 34 and the first residual signal η from the second adder 32 are input and outputs a second residual signal φ; And an LMS processing unit 36 for performing an operation for updating the filter coefficient.
Then, the filter coefficient of the C filter 34 is updated based on the random reference signal L ′, the second residual signal φ, and the current filter coefficient of the C filter 34, and the C filter 3
4, the transmission characteristics of the vibration noise transmission path are identified.

Further, the band pass filter 19 and C
Between the filter 34 and between the second adder 32 and the third adder 35, a first ring composed of a plurality of ring-shaped storage columns formed according to the tap length of the W filter 25 Buffer 37 and second ring buffer 38 (second
Storage means) are interposed. The W filter 2 is provided by the first and second ring buffers 37 and 38.
Pseudo-periodic sequence of C filter 34 corresponding to tap length of 5
(Filter coefficient) is created.

That is, as shown in FIG. 5A, the first and second ring buffers 37, 38
5 m storage columns having a predetermined memory space corresponding to the tap length n (1), n (2 ), ... made n (m), the run
The dam reference signal L ′ and the first residual signal η are stored in each of the storage columns n (1), n (2),.
Are sequentially stored. Then, for example, from the storage column n (1), as shown in FIG. 5B, the first sampling period n (1) and the (m + 1) th sampling period n
(M + 1),..., The (km + 1) -th sampling period n (km + 1) (k is an integer) are sequentially added to output an output signal, and as shown in FIG.
, A pseudo-periodic sequence having a tap length m corresponding to the tap length m is created.

In the vibration noise control device for a vehicle configured as described above, the basic pulse signal X detected by the rotation detection sensor 15 is input to the timing pulse generator 20 at every predetermined sampling frequency Fs. The timing pulse X ′ of the primary and secondary vibration components is supplied from the creating unit 20 to the W filter 25 and the correction filter unit 27.
, The S-LMS processing unit 33 and the register unit 30, and the control signal Y from the W filter 25.
Is output.

On the other hand, the low- amplitude level random signal L output from the random signal generating means 21 is converted into a first ring buffer as a random reference signal L 'from which a random signal outside a predetermined frequency band is removed by the band-pass filter 22. 37, a C filter 34 and an LMS processing unit 36
And the random reference signal L 'is superimposed on the control signal Y from the W filter 25 to generate an output signal V. The output signal V is input to the D / A converter 17, and further the amplifier 18, the electromechanical converter 40 , And is input to the first adder 14 as a drive signal Z via the vehicle body 8.

On the other hand, the vibration and noise signal D from the engine 1 is input to the first adder 14, and the first adder 14 adds the analog output signal Z and the vibration and noise signal D to generate an error signal. is output to the LMS processing unit 26 and the second adder 32 of the correction filter unit 27 via the A / D converter 19 .

The cancellation signal ρ from the E filter 31 is input to the second adder 32, and the second adder 32
Outputs a first residual signal η, and the first residual signal η is supplied to a third adder 3 via a second ring buffer 38.
5 is input. On the other hand, the output signal τ from the C filter 34 is input to the third adder 35. And the third
Adder 35 outputs a second residual signal φ. Based on the second residual signal φ, the random reference signal L ′, and the current filter coefficient of the C filter 34, the C filter 3
4 and the transmission characteristics (CＣ) of the vibration noise transmission path are identified, and the transmission characteristics (C〜) thus identified are updated.
Is stored in the register unit 30.

The reference signal R as a transfer characteristic is input from the register unit 30 to the SFX-LMS processing unit 26, and the reference signal R, the timing pulse signal X ', the error signal ε, and the current filter of the W filter 25 The filter coefficient of the W filter 25 is updated based on the coefficient, and the vibration noise of the engine 1 is controlled based on the updated control signal Y.

As described above, in the vibration noise control device for a vehicle, the transmission characteristics of the vibration noise transmission path are identified based on the timing pulse signal X ', the random reference signal L' and the error signal ε while controlling the vibration noise. Because, the transfer characteristics are identified in advance with high accuracy, without the need for complicated arithmetic functions associated with the sampling frequency variation system,
It is possible to easily and quickly follow a change in characteristics of the system such as a change with time (deterioration) or a change in environmental temperature. Moreover, the periodic signal removing means 28 removes a periodic signal (or a pseudo-periodic signal) having a large amplitude generated according to the operating state of the engine, so that the noise level is low, that is, S / N.
The first residual signal η having a good ratio is input to the transfer characteristic identification means 29, and the reference signal R identified with high accuracy can be obtained.

In the above embodiment, the W filter 25 is connected via the first and second ring buffers 37 and 38.
Of the random reference signal L ' corresponding to the tap length of
Since the pseudo-periodic sequence of the residual signal η is created in advance, the complicated calculation steps as described in the section of [Prior Art] can be omitted, and the calculation load can be reduced. Therefore, it is possible to further improve the followability of the adaptive control to the system.

In the above-described vehicle vibration noise control device, the rotation detection sensor 15 detects the basic pulse signal X based on the rotation of the flywheel having a large moment of inertia and a small rotation fluctuation. As in the case where the basic pulse signal is detected from the ECU of the engine based on the CRK sensor, the rotation of the camshaft pulley and the crankshaft pulley are affected by elongation of the timing belt and torsional vibration of the crankshaft. A desired sampling frequency Fs can be created with high accuracy without causing a detection error.

It is needless to say that the present invention is not limited to the above embodiment, but can be changed without departing from the scope of the invention. For example, a filter having a tap number of “1”, for example, is provided on the output side of the W filter 25 so as to be able to cope with a transient operation state such as a sudden change in the engine speed, and the gain of the filter coefficient is corrected. However, it goes without saying that the same effects as those of the above embodiment can be obtained.

In the above embodiment, the rotation signal of the flywheel is detected by the pulse encoder. However, a rotary encoder as rotation signal detection means is provided near the camshaft or the crankshaft, and the rotary encoder detects the rotation signal. The frequency of the detected rotation signal is divided to obtain a sampling frequency Fs.
Alternatively, the timing pulse signal X ′ may be generated. Also,
The present invention relates to a multi-cylinder engine other than a four-cylinder engine, for example, a six-cylinder engine.
Needless to say, the present invention can be applied to an eight-cylinder engine, and the number of timing pulse signals is not limited to two but may be a single one. Alternatively, the number of timing pulse signals may be increased to four or six. It is also preferable to perform finer vibration noise control.

[0059]

As described in detail above, the present invention relates to a periodic or pseudo period generated in at least one or more predetermined regions of a vehicle body or a vehicle cabin due to a vibration noise source including at least a power plant for driving a vehicle. A first control signal for changing a transfer characteristic between the predetermined area from the vibration noise source by filtering a predetermined input signal indicating a vibration noise waveform with respect to a typical vibration noise;
Filter means, and converting the control signal into a drive signal
Electromechanical conversion means for controlling vibration noise by the drive signal
When the error signal detection means for detecting the vibration noise error signal is reduced by the vectorial sum the output from the electromechanical converter in the predetermined area, the electromechanical variable
A second filter for expressing a transmission characteristic of a vibration noise transmission path formed between the switching means and the error signal detecting means, a detection result of the error signal detecting means and an output from the second filter. Control signal updating means for updating the filter coefficient of the first filter means so that the vibration noise error signal has a minimum value based on the reference signal and the filter coefficient of the first filter means. in the vibration noise control apparatus, superimposed and Rupa pulse signal detecting means for issuing test the Rupa pulse signal to determine the driving period of the vibration noise source, the control signal output from the pre <br/> Symbol first filter means A random signal generating means for generating a random signal
A sampling period determining means for determining a sampling period in response to the detection timing of the detected Rupa pulse signal by Kipa pulse signal detecting means, the output and the first filter means of the with in the sampling period the first filter means And a driving unit that controls a series of operations including an update of the filter coefficient, and wherein the second filter unit includes:
A periodic signal removing unit that outputs a residual signal in which a periodic signal due to the vibration noise source is removed from the error signal detected by the error signal detecting unit; a random signal output from the random signal generating unit; said a residual signal outputted from the periodic signal removing means second filter means
Transfer characteristic identification means for identifying a transfer characteristic of the vibration noise transmission path based on a filter coefficient of an identification filter provided, and first storage means for storing the transfer characteristic identified by the transfer characteristic identification means Therefore, the transmission characteristics of the vibration noise transmission path can be quickly and easily identified while performing the vibration noise control without requiring a complicated arithmetic function, and a desired reduction of the vibration noise can be achieved.

That is, characteristic changes such as aging (deterioration) and environmental temperature changes can be performed without previously identifying the vibration noise transmission characteristics with high precision and without requiring a complicated arithmetic function associated with a sampling frequency fluctuation system. Can be easily and quickly followed. Moreover, since the transmission characteristics of the vibration noise transmission path are identified while performing the vibration noise control,
Variations in quality can be avoided as much as possible, and a vibration and noise control device for a vehicle can be obtained that can cope with fluctuations in the transmission characteristics due to the specifications and equipment of the vehicle and the usage conditions of the driver.

[0061] More specifically, the periodic signal removing means outputs a periodic signal having an opposite phase to the predetermined input signal.
A third filter means for the force, and the residual signal generating means for generating a residual signal based on the error signal from the periodic signal output from said third filter means and said error signal detecting means, before Kipa because and a periodic signal identifying means for identifying the periodic signal on the basis of the pulse signal and the residual signal and the filter coefficient of the third filter means, the pulse signal synchronized to that periodic signals are removed The obtained residual signal is input to the transfer characteristic identification means, and the transfer characteristics of the two filter means are updated easily and quickly.

[0062] Further, before Kipa pulse signal detecting means, the a first basic pulse signal detecting means for detecting a rotation signal of the flywheel secured to the crankshaft of the power plant, a rotation signal of the crankshaft Second basic pulse signal detection means for detecting at every predetermined minute angle of the crankshaft ;
At least one or more basic pulse signal detecting means among the third basic pulse signal detecting means for detecting a rotation signal of a camshaft of the power plant at every predetermined minute angle of the camshaft. Accordingly, a high-precision sampling frequency can be easily and easily generated without causing a detection error of the basic pulse signal due to the rotation fluctuation, and appropriate desired vibration noise control can be performed.

A plurality of storage columns for sequentially storing the random signal generated by the random signal generating means and the residual signal output from the residual signal generating means for each sampling cycle determined by the sampling cycle determining means. The identification filter, the second storage means comprising:
It is one by having sequentially adding pseudo periodic sequence creation means to create a quasi-periodic sequence with a stored content stored in the storage column, the conventional complicated operation steps, such as the one of the plurality of storage columns , The pseudo-periodic sequence of the second filter means can be identified, the transmission characteristics in the vibration noise transmission path can be identified easily and quickly, and the computation load can be reduced and the adaptive control system can be identified. Follow-up performance can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an attachment state of an engine to a vehicle body and an arrangement position of an error signal detection unit.

FIG. 2 is an overall configuration diagram showing an embodiment of a vehicle vibration noise control device according to the present invention.

FIG. 3 is a time chart for explaining a vibration order.

FIG. 4 is a detailed view of a main part of the present invention.

FIG. 5 is a diagram illustrating a method of creating a pseudo-periodic sequence.

[Explanation of symbols]

 1 Internal combustion engine (vibration noise source) 2a Self-expanding engine mount (electromechanical converter
Stage) 5a Self-expandable suspension device (electromechanical conversion means) 7a Self-expandable support (electromechanical conversion means) 14 First adder (error signal detection means) 15 Rotation detection sensor (first pulse signal detection means) 17) Timing pulse generator (second pulse signal detection)
Means) 21 random signal generating means 25 W filter (first filter means) 26 SFX-LMS processing section (control signal updating means) 27 correction filterDepartment  Reference Signs List 28 periodic signal removing unit 29 transfer characteristic identifying unit 30 register unit (storage unit) 31 E filter (third filter unit) 32 second adder (cancellation signal generation unit) 37 first ring buffer (storage unit) 38 Second ring buffer (storage means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI G10K 11/16 G10K 11/16 J (56) References JP-A-5-333880 (JP, A) JP-A-62-193310 ( JP, A) JP-A-63-148709 (JP, A) JP-A-4-267298 (JP, A) JP-A-4-226498 (JP, A) JP-A-3-204354 (JP, A) Hei 6-74298 (JP, A) JP-A Hei 5-288238 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10K 11/178 B60R 11/02 F01N 1/00 F01N 1 / 06 F16F 15/02 G10K 11/16

Claims (4)

(57) [Claims] At least a power plant for driving a vehicle
Body (8) or cabin due to vibration noise source including (1)
(9) with respect to periodic or quasi-periodic vibration noise generated in at least one or more predetermined regions in the vibration Noise
First filter means (25) for outputting a control signal for changing a transfer characteristic between the predetermined area from the vibration noise source by filtering a predetermined input signal indicating a sound waveform; and It is converted to a drive signal and
Electromechanical transducer means for controlling the dynamic noise (50), the error signal detection means for a vibration noise error signal is reduced by the vectorial sum the output from the electromechanical converter (50) detected in the predetermined region (14 ) , Said electromechanical conversion means (50) and said error signal detection means
(14) a second filter means (27) expressing the transfer characteristic of the vibration noise transmission path formed between the second filter means (27) and the detection result of the error signal detection means (14) and the second filter means (27). ) And the filter coefficient of the first filter means (25) is updated based on the reference signal output from the first filter means (25) and the filter coefficient of the first filter means (25) so that the vibration noise error signal has a minimum value. in vehicle vibration noise control device and a control signal renewal means (26), and Rupa pulse signal detecting means to <br/> detect the Rupa pulse signal to determine the driving period of the vibration noise source, before First filter means
(25) and the random signal generating means (21) for generating a random signal to be superimposed on the control signal outputted from depending on the detection timing before Kipa <br/> detected by pulse signal detection means Rupa pulse signal governing the sampling period determining means for determining a sampling period, a series of operations including the updating of the output and the filter coefficient of said first filter means (25) of the with in the sampling period the first filter means (25) Driving means (16) , and the second filter means (27) removes a periodic signal caused by the vibration noise source from the error signal detected by the error signal detecting means (14) . a periodic signal removing means for outputting a residual signal (28), a random signal output from the random signal generating means (2 1) and the periodic signal removing means (28) And the identification filter provided in the second filter means (27).
Transfer characteristic identification means (2) for identifying the transfer characteristic of the vibration noise transmission path based on the filter coefficient of the filter (34).
9) and a first storage means (30) for storing the transfer characteristics identified by the transfer characteristic identification means (29) . Wherein said periodic signal removing means (28), wherein
A third filter means for outputting a periodic signal of opposite phase (31) for a given input signal, the periodic signal output from said third filter means (31) and said error signal detecting means (14) A residual signal generating means (32) for generating a residual signal based on the error signal of the first and second signals, and the period based on the predetermined input signal , the residual signal, and a filter coefficient of the third filter means (31). The vibration noise control device for a vehicle according to claim 1, further comprising a periodic signal identification means (33) for identifying a signal. 3. Before Kipa pulse signal detecting means, a first basic pulse signal detecting means for detecting a rotation signal of the flywheel secured to the crankshaft of the power plant (1)
And (15) transmitting the crankshaft rotation signal to the crankshaft.
該Ka a second basic pulse signal detecting means for detecting a predetermined minute angle, a rotation signal of the camshaft of the power plant
3. The apparatus according to claim 1, further comprising at least one or more basic pulse signal detecting means among the third basic pulse signal detecting means for detecting at every predetermined minute angle of the system axis. Vibration noise control device for vehicles. 4. The random signal generated by the random signal generating means (21) and the residual signal generating means.
The second storage means (3) comprising a plurality of storage columns for sequentially storing the residual signal output from (32) and the sampling signal determined by the sampling cycle determination means.
7, 38), and the identification filter (34) is a pseudo-periodic sequence generator that sequentially adds the storage contents stored in one of the plurality of storage columns to generate a pseudo-periodic sequence. 4. The vibration and noise control device for a vehicle according to claim 1 , further comprising a step .