JPH11325168A - Active vibration noise suppression device - Google Patents

Abstract

(57) Abstract: Provided is an active vibration noise suppression device that does not require calculation of a filter coefficient of an adaptive filter in real time. A cosine wave and a sine wave synchronized with the frequency of an engine pulse are generated from a cosine wave generator and a delay unit, and the generated cosine wave and the generated sine wave are supplied to an adaptive notch filter, based on the engine pulse. The adaptive notch filter coefficients W0 and W1 for suppressing the noise generated in the vibration noise suppression unit 9 are used to specify the address of the ROM 10 stored in advance at the address position based on the frequency of the engine pulse, and the address counter 11 which counts the number of engine pulses.
The adaptive notch filter coefficients W0 and W1 read from the ROM 10 are set in the adaptive notch filter 7, and the output of the adaptive notch filter 7 drives the secondary vibration noise generator 3 to suppress the vibration noise. The second vibration noise is generated, and the vibration noise generated in the vibration noise suppression unit 9 based on the engine pulse is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active vibration noise suppression device for suppressing vibration noise generated in synchronization with the engine speed of a vehicle or the like.

[0002]

2. Description of the Related Art In a conventional active vibration noise suppression device (hereinafter, also referred to as "ANC") for suppressing vibration noise generated in synchronization with the engine speed of a vehicle or the like, an engine pulse is used as a reference signal, and an object to be suppressed is used. Feedforward adaptive control is performed to reduce vibration noise by generating secondary vibration noise to cancel certain vibration noise.

In this conventional feedforward adaptive control, as shown in FIG. 11, a signal synchronized with an ignition signal is used as an engine pulse, and the engine pulse is supplied to the adaptive filter 1 as an input signal. An error signal based on the difference between the secondary vibration noise generated from the noise generator 3 and the vibration noise based on the engine pulse) and an engine pulse signal as a reference signal are supplied to the adaptive control algorithm operation unit 2 to provide an adaptive filter 1 Is calculated based on an adaptive control algorithm such as an LMS algorithm, and the calculated filter coefficient is set in the adaptive filter 1 to be adapted. The output of the adaptive filter 1 is output to the secondary vibration noise generator 3. Supply 2
By generating the next vibration noise, the vibration noise based on the engine pulse is suppressed.

There is also known an adaptive control using an adaptive notch filter in the conventional feedforward adaptive control.

As shown in FIG. 12, the adaptive notch filter for suppressing vibration noise receives an engine pulse, outputs a cosine wave signal synchronized with the engine pulse from the cosine wave generator 5, and generates the cosine wave signal from the cosine wave generator 5. The cosine wave signal and the sine wave signal generated by delaying the generated cosine wave signal by π / 2 radian by the delay unit 6 are supplied to the adaptive notch filter 7, and the generated cosine wave signal from the cosine wave generator 5 and the delay unit 6, a sine wave signal generated by delaying the signal by π / 2 radian is used as a reference signal. The adaptive notch filter coefficients W0 and W1 of the filter 7 are calculated, and the calculated adaptive notch filter coefficients W0 and W1 are The adaptive notch filter coefficient is adapted by setting it, and the output of the adaptive notch filter 7 is supplied to the secondary vibration noise generator 3 to generate secondary vibration noise, thereby suppressing the vibration noise based on the engine pulse.

Here, the adaptive notch filter 7 includes a multiplier 7
a and 7b, an adder 7c, a cosine wave signal and an adaptive notch filter coefficient W0 are multiplied by a multiplier 7a, and a sine wave signal and an adaptive notch filter coefficient W1 are multiplied by a multiplier 7b. The output of the multiplier 7b and the output of the multiplier 7b are added by an adder 7c and output to the secondary vibration noise generator 3. The notch frequency corresponds to the frequency of the engine pulse, which is the frequency for noise suppression.

[0007]

However, when vibration noise is suppressed using the above-described conventional feedforward adaptive control, a calculation for calculating filter coefficients of an adaptive filter and an adaptive notch filter in an active vibration noise suppression device is performed. Since the amount is large, there is a problem that a digital signal processor (DSP) having a high operation speed is required.

For this reason, an ECU which is a controller composed of a computer used for controlling combustion of an engine of a vehicle or the like.
It becomes difficult to use the (Electronic Control Unit) as a controller for ANC, and in addition to the ECU used for engine combustion control, a separate DSP for an active vibration noise suppression device must be provided. However, there is also a problem that it becomes expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an active vibration noise suppression device which does not require the calculation of the filter coefficients of an adaptive filter in real time.

[0010]

Means for Solving the Problems Claim 1 according to the present invention.
The active vibration noise suppression device described above, a cosine wave generator that generates a cosine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppression unit, and a sine wave synchronized with the frequency of the vibration noise A generated sine wave generating means, an adaptive notch filter to which a generated cosine wave from the cosine wave generator and a sine wave generated from the sine wave generating means are input, and the vibration suppression based on vibration noise of the vibration noise source. Storage means for storing an adaptive notch filter coefficient for suppressing the noise generated in the unit at an address position based on the frequency of the vibration noise of the vibration noise source, and a count value obtained by counting the frequency of the vibration noise of the vibration noise source. And an address counter for specifying an address of the storage means based on the output of the adaptive notch filter. A secondary vibration noise generator configured to generate a secondary vibration noise that suppresses vibration noise, wherein an adaptive notch filter coefficient stored in the storage unit addressed by the count value of the address counter is set in the adaptive notch filter. It is characterized by doing.

According to a first aspect of the present invention, there is provided an active vibration noise suppressing device, wherein the cosine wave and the sine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppressing unit are generated by a cosine wave generator and Generated by the sine wave generating means,
The generated cosine wave and the generated sine wave are input to the adaptive notch filter, the secondary vibration noise generator is driven by the output of the adaptive notch filter, and the vibration noise in the vibration noise suppression unit is generated from the secondary vibration noise generator. Suppressed by vibration noise. In this case, an adaptive notch filter coefficient for suppressing generated vibration noise in the vibration noise suppression unit based on the vibration noise of the vibration noise source is stored in advance in an address position based on the frequency of the vibration noise of the vibration noise source. The address position of the storage means is designated based on the count value obtained by counting the frequency of the vibration noise of the vibration noise source by the address counter, and the adaptive notch filter coefficient stored in the addressed storage means is applied to the adaptive notch filter. It is not necessary to calculate the adaptive notch filter coefficient in real time to be set, and the ECU for fuel control
Can be provided with an active vibration noise suppression device,
A high-speed DSP is not required.

According to a second aspect of the present invention, there is provided an active vibration noise suppressing device, wherein the cosine wave generator generates a cosine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppressing section. A sine wave generating means for generating a sine wave synchronized with the frequency of the vibration noise, an adaptive notch filter to which a cosine wave generated from the cosine wave generator and a sine wave generated from the sine wave generating means are inputted; The adaptive notch filter coefficient for suppressing the noise generated in the vibration suppression unit based on the vibration noise of the noise source and the noise generated in the vibration noise suppression unit based on the accelerator opening is set to the frequency of the vibration noise of the vibration noise source and the accelerator opening. Storage means pre-stored at an address position based on the degree, a count value obtained by counting the frequency of the vibration noise of the vibration noise source, and the accelerator opening Addressing means for addressing the storage means based on the output of the adaptive notch filter, and a secondary vibration noise generator driven by the output of the adaptive notch filter to generate a secondary vibration noise for suppressing the vibration noise in the vibration noise suppressing section. And setting an adaptive notch filter coefficient stored in the storage means addressed by the address specifying means in the adaptive notch filter.

According to a second aspect of the present invention, there is provided an active vibration noise suppressing device, wherein the cosine wave and the sine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppressing section are generated by a cosine wave generator and Generated by the sine wave generating means,
The generated cosine wave and the generated sine wave are input to the adaptive notch filter, the secondary vibration noise generator is driven by the output of the adaptive notch filter, and the vibration noise in the vibration noise suppression unit is generated from the secondary vibration noise generator. Suppressed by vibration noise. In this case, the storage means includes an adaptive notch filter coefficient for suppressing the noise generated in the vibration noise suppression unit based on the vibration noise of the vibration noise source and the noise generated in the vibration noise suppression unit based on the accelerator opening. The adaptive notch filter coefficient is stored in advance in the storage means addressed and stored in the adaptive notch filter based on the frequency of vibration noise and the accelerator opening, and the adaptive notch filter coefficient is calculated in real time. The active vibration and noise suppression device can be provided in the ECU for fuel control, and a high-speed processing DSP is not required.

According to a third aspect of the present invention, there is provided an active vibration noise suppressing device, wherein the cosine wave generator generates a cosine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppressing section. An adaptive notch filter including an amplifier that receives the cosine wave generated from the cosine wave generator and amplifies the cosine wave, and a phase shifter that shifts the phase of the output of the amplifier, and is driven by an output of the adaptive notch filter. hand,
A secondary vibration noise generator configured to generate a secondary vibration noise that suppresses the vibration noise in the vibration suppression unit based on the vibration noise of the vibration noise source, and a noise generated in the vibration suppression unit based on the vibration noise of the vibration noise source Storage means in which the gain of the amplifier and the phase shift amount of the phase shifter based on the adaptive notch filter coefficient for suppressing the noise are stored in advance at an address position based on the frequency of the vibration noise of the vibration noise source; An address counter for counting the frequency of the vibration and noise of the above and addressing the storage means based on the count value. The gain and the phase shift amount stored in the storage means addressed by the count value of the address counter Are set in the amplifier and the phase shifter, respectively.

According to a third aspect of the present invention, a cosine wave generator generates a cosine wave synchronized with a frequency of vibration noise of a vibration noise source, and the generated cosine wave is input to an adaptive notch filter. Is amplified and phase-shifted and output from the adaptive notch filter. The output drives a secondary vibration noise generator, and the vibration noise in the vibration noise suppression unit is generated from the secondary vibration noise generator. Is suppressed by In this case, the storage means stores the gain of the amplifier and the phase shift amount of the phase shifter based on the adaptive notch filter coefficient for suppressing the noise generated in the vibration noise suppression unit of the vibration noise source to the vibration noise frequency of the vibration noise source. The address position of the storage means is designated in advance based on the count value obtained by counting the engine pulses by the address counter, and the amplification gain and phase shift amount stored in the addressed storage means are adaptively notched. It is not necessary to calculate the adaptive notch filter coefficient, that is, the amplification gain and the amount of phase shift, in real time to be set in the amplifier and the phase shifter constituting the filter. And a high-speed DSP is not required.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an active vibration noise suppression device according to the present invention will be described with reference to embodiments.

FIG. 1 is a block diagram showing a configuration for explaining the principle of an active vibration noise suppression device according to an embodiment of the present invention, and illustrates a case where an adaptive notch filter is used.

An active vibration noise suppression device 20 according to an embodiment of the present invention shown in FIG. 1 uses an adaptive notch filter as an adaptive filter.

Upon receiving an engine pulse which is a signal synchronized with an ignition signal supplied to an engine which is a vibration noise source, a cosine wave signal synchronized with the engine pulse is output from a cosine wave generator 5. The generated cosine wave signal and a sine wave signal generated by delaying the generated cosine wave signal by π / 2 radian phase by the delay unit 6 serving as a sine wave generating means are supplied to the adaptive notch filter 7 as input signals.

Here, the adaptive notch filter 7 having a single frequency notch frequency has an adaptive notch filter coefficient W
A multiplier 7a multiplies the signal of 0 and the noise suppression frequency, in this example, the cosine wave signal output from the cosine wave generator 5 by the adaptive notch filter coefficient W1 and the signal of the noise suppression frequency by π /
The multiplier 7b multiplies the signal of the noise suppression frequency delayed by 2 radian phases and the sine wave signal output from the delay unit 6 in the embodiment of the present invention by the multiplier 7b.
It is configured to add and send by c.

The adaptive notch filter coefficients W0 and W1 of the adaptive notch filter 7, which are transmitted from the engine as a vibration noise source to the vibration noise suppression unit 9 and minimize the vibration noise in the vibration noise suppression unit 9, are developed vehicles and the like. ROM as storage means corresponding to the frequency of the engine pulse, that is, the engine (crankshaft) speed previously obtained by
10 is stored.

Here, a crankshaft rotation pulse may be used instead of the engine pulse.

On the other hand, the number of engine pulses per unit time in response to the engine pulse is counted by the address counter 11, and the address of the ROM 10 is designated by the count value of the address counter 11, and the adaptive notch based on the frequency of the engine pulse is designated. Filter coefficients W0 and W1 are stored in ROM 10
And supplies it to the adaptive notch filter 7.

That is, the ROM 10 constitutes a look-up table for converting the frequency of the engine pulse, which is the frequency of the vibration noise generated from the vibration noise source, into adaptive notch filter coefficients W0 and W1, and the ROM 10 includes Adaptive notch filter coefficients W0 and W1 for canceling the vibration noise caused by the engine by the vibration noise generated from the secondary vibration noise generator 3 correspond to the frequency of the engine pulse, and are shown by solid lines as the W0 map and the W1 map in FIG. Is stored as In the ROM 10 of FIG. 1, "xxx" indicates the adaptive notch filter coefficients W0 and W1.

In the active vibration and noise suppression device 20 according to the embodiment of the present invention configured as described above, the engine pulse is also supplied to the ROM 10 and the number of engine pulses per unit time is counted by the address counter 11. Is stored in the ROM according to the count value of the address counter 11.
10 and the adaptive notch filter coefficients W0 and W1 based on the frequency of the engine pulse are R
The data is read from the OM 10 and set in the adaptive notch filter.

On the other hand, the engine pulse is supplied to the cosine wave generator 5, and the cosine wave generator 5 outputs a cosine wave signal synchronized with the engine pulse. The generated cosine wave signal from the cosine wave generator 5 is supplied to the delay unit 6, the π / 2 radian phase is delayed, and the sine wave signal is output from the delay unit 6. The frequency of the cosine wave signal and the frequency of the sine wave signal are engine pulse frequencies.

In the adaptive notch filter 7 in which the adaptive notch filter coefficients W0 and W1 read from the ROM 10 are set, the cosine wave signal output from the cosine wave generator 5 and the adaptive notch filter coefficient W0 are supplied to the multiplier 7a. The sine wave signal output from the delay unit 6 and the adaptive notch filter coefficient W1 are multiplied by the multiplier 7b, and the output of the multiplier 7a and the output of the multiplier 7b are added by the adder 7c. Then, the added output, that is, the output from the adaptive notch filter 7 is supplied to the secondary vibration noise generator 3 provided in the vibration noise suppression unit 9, and the secondary vibration noise generator 3 generates the secondary vibration noise. Thus, the vibration noise at the notch frequency is reduced in the vibration noise suppression unit 9.

However, the adaptive notch filter coefficients W0 and W1 read from the ROM 10 are adaptive notch filter coefficients for suppressing vibration noise based on the frequency of the engine pulse, and the secondary vibration output from the secondary vibration noise generator 3. The noise cancels the noise of the notch frequency in the vibration noise suppression unit 9 due to the engine pulse. It is not necessary to calculate the adaptive notch filter coefficients in real time for this cancellation.

Next, a method of obtaining the adaptive notch filter coefficients W0 and W1 stored in the ROM 10 will be described with reference to a vehicle.

FIG. 2 is a schematic diagram for explaining a method of obtaining an adaptive notch filter coefficient stored in the ROM 10,
An example is shown in which vibration noise in the vehicle interior is suppressed based on the vibration of the engine of the vehicle and the accelerator opening. Here, the cabin corresponds to the vibration noise suppression unit 9.

A DSP 15 comprising an adaptive notch filter 7 based on an adaptive control algorithm and an adaptive notch filter coefficient calculating means (not shown) based on an adaptive control algorithm for calculating adaptive notch filter coefficients W0 and W1, a cosine wave receiving an engine pulse The development vehicle 12 includes a generator 5, a delay unit 6 for delaying the cosine wave generated from the cosine wave generator 5 by π / 2 radians, and an address counter 11 for counting engine pulses per unit time. .

A signal synchronized with an ignition signal of an engine mounted on the development vehicle 12, that is, an engine pulse,
Alternatively, the crankshaft rotation pulse is supplied to the cosine wave generator 5 and the address counter 11, and the generated cosine wave signal from the cosine wave generator 5 is supplied to the delay unit 6, so that the cosine wave and the sine wave synchronized with the engine pulse are generated. And addressing data.

The cosine wave and the sine wave and the addressing data are supplied to an adaptive notch filter coefficient calculating means which operates as an adaptive notch filter 7 and an adaptive control algorithm calculator 8 formed in the DSP 15, and
Microphones 16a and 16b provided at predetermined positions on the ceiling of the vehicle compartment of the development vehicle 12 detect the vibration noise in the vehicle compartment and convert it into an electric signal, and supply the detected vibration noise signal converted into the electric signal to the DSP 15 as an error signal. The output from the adaptive notch filter 7 formed in the DSP 15 is provided via a mixer 19 with a speaker 17a which also functions as a secondary vibration noise generator provided below the driver's seat of the development vehicle 12 and a backrest of the rear passenger seat of the development vehicle 12. Is provided to a speaker 17b which also functions as a secondary vibration noise generator provided behind the speaker 1b.
It is configured to drive 7a and 17b.

Here, the mixer 19 is provided with a speaker for reproducing an audio signal from an audio unit 18 which is an audio device such as a radio receiver and a magnetic tape reproducing device provided with a speaker 17a and 17b in a vehicle. It is provided for common use.

The development vehicle 12 configured as described above is driven. The vibration noise in the interior of the development vehicle 12 during this traveling is detected by the microphones 16a and 16b. In this case, the outputs from the microphones 16a and 16b are the vibration noise remaining in the cabin of the development vehicle 12 and the vibration noise remaining without being canceled by the reproduced sounds from the speakers 17a and 17b.

The cosine wave and the sine wave based on the engine pulse or the crankshaft rotation pulse during the running of the development vehicle 12 are supplied to the adaptive notch filter coefficient calculating means and the adaptive notch filter 7 formed in the DSP 15, and the microphone 16a, The error signal obtained by converting the vehicle interior vibration noise detected by 16b is supplied to the adaptive notch filter coefficient calculating means formed in the DSP 15,
Adaptive notch filter coefficients W0 and W1 in which the vehicle interior vibration noise detected by microphones 16a and 16b are canceled by the output vibration noise of speakers 17a and 17b driven by the output of adaptive notch filter 7 are adaptive notch filter coefficient calculation means in DSP 15. The calculated adaptive notch filter coefficients W0 and W1 are stored in the address position of the ROM 10 corresponding to the addressing data based on the frequency of the engine pulse. Note that, specifically, the adaptive notch filter coefficients W0 and W1 are written into the ROM 10 by a ROM writer that operates under the control of the DSP 15.

In short, the output from the adaptive notch filter 7 formed in the DSP 15 is supplied to the speakers 17a and 17b via the mixer 19 to drive the speakers 17a and 17b and output from the microphones 16a and 16b. The adaptive notch filter coefficients W0 and W1 when the level is "minimum" are obtained by the adaptive notch filter coefficient calculating means for each frequency of the engine pulse, and the frequency of the engine pulse (rotation of the crankshaft) is stored in the working area of the memory of the DSP 15. Number)
The adaptive notch filter coefficients W0 and W1 of the adaptive notch filter 7 are obtained by sequentially storing the values corresponding to the frequency of the engine pulse (the rotation speed of the crankshaft). The adaptive notch filter coefficients W0 and W1 thus obtained are written in the ROM 10 by a ROM writer.

Further, in order to detect the depression position of the accelerator pedal, a potentiometer 13 is provided in conjunction with the depression operation of the accelerator pedal.
, The output of the potentiometer 13 is converted into digital data by the A / D converter 14 acting as addressing means, and the accelerator is fully opened, 90% open, 80% open,... , 1
The output data from the A / D converter 14 corresponding to the 0% opening and the fully-opened accelerator opening is used as column addressing data, and the addressing data of the address counter 11 is used as row addressing data. Opening, 80%
The opening,... The adaptive notch when the output level from the microphones 16a and 16b becomes "minimum" for each frequency of the engine pulse (the number of rotations of the crankshaft) in the case of the accelerator opening of 10% opening and fully closing. The filter coefficients W0 and W1 are obtained by the adaptive notch filter coefficient calculating means, and the adaptive notch filter coefficients W0 thus obtained are obtained.
By writing W1 and W1 into the ROM 10 corresponding to the accelerator opening and the crankshaft rotation speed as shown in FIG. 3, the frequency of the engine pulse (the rotation speed of the crankshaft) and the accelerator opening are obtained. The ROM 10 storing the adaptive notch filter coefficients W0 and W1 based thereon may be obtained. In FIG. 3, the full opening, 90% opening, 80% opening,... Are referred to as opening 1, opening 2, opening 3,. is there.

Next, a case where the present invention is applied to a mass-produced vehicle 12A corresponding to the above-described developed vehicle 12 will be described with reference to FIG.

The RO storing the adaptive notch filter 7 and the adaptive notch filter coefficients W0 and W1 obtained as described above.
M10 and an ECU 21 for controlling the engine fuel of the mass-produced vehicle 12A with respect to the developed vehicle 12 as shown in FIG.
And a cosine wave generator 5, a delay unit 6, an address counter 11, a potentiometer 13 for detecting the accelerator opening, and an A / D converter 14 for converting the output of the potentiometer 13 into digital data. .

The engine pulse or the crankshaft rotation pulse of the mass-produced vehicle 12A is supplied to the cosine wave generator 5 and the address counter 11, and the cosine wave generated by the cosine wave generator 5 is supplied to the delay unit 6 and the delay unit 6 , A cosine wave and a sine wave are supplied to the adaptive notch filter 7, and an engine pulse or a crankshaft rotation pulse of the mass-produced vehicle 12A is supplied to the address counter 11 for counting. A row address of the ROM 10 is specified by a numerical value, and a column address of the ROM 10 is specified by the conversion data of the A / D converter 14. An adaptive notch filter based on the engine pulse frequency (the number of revolutions of the crankshaft) and the accelerator opening. Coefficients W0 and W1
Is read from the ROM 10 and supplied to the adaptive notch filter 7 to generate an adaptive notch filter coefficient. The output from the adaptive notch filter 7 in which the adaptive notch filter coefficients W0 and W1 read from the ROM 10 are set via the mixer 19. To drive the speakers 17a and 17b.

By doing so, the vehicle interior vibration noise generated based on the frequency of the engine pulse and the accelerator opening is canceled out by the secondary vibration noise output from the speakers 17a and 17b, as shown in FIG. It operates in the same manner as the active vibration noise suppression device 20.

In this case, since the adaptive notch filter coefficients W0 and W1 have already been stored in the ROM 10, the DSP 15 and the microphone 1
It is not necessary to provide 6a and 16b.

The adaptive notch filter coefficients W0 and W1 read from the ROM 10 suppress the vibration noise in the vehicle interior due to the frequency of the engine pulse and the vibration noise in the vehicle interior due to the accelerator opening and output from the microphones 16a and 16b. Level "minimum"
Notch filter coefficient, and the speaker 17a
And 17b cancel the vibration noise at the notch frequency in the vehicle interior due to the engine pulse and the vibration noise in the vehicle interior due to the accelerator opening. It is not necessary to calculate the adaptive notch filter coefficient in real time for canceling the vibration noise.

Next, a first modified example of the active vibration noise suppression device according to one embodiment of the present invention will be described.

FIG. 5 is a block diagram showing the configuration of a first modification of the active vibration noise suppression device according to one embodiment of the present invention.

The first modified example of the active vibration noise suppression device according to one embodiment of the present invention is an example in which vibration noise generated when the engine mounted on the vehicle has four cylinders is canceled.

When the engine is a four-cylinder engine, vibration noises of the second, fourth and sixth harmonics of the frequency of the engine pulse are generated. That is, the vibration noise of the engine is generated in the vibration noise suppression unit at a frequency of 2, 4, or 6 times the fundamental frequency due to the vibration noise of the engine.

In a first modified example of the active vibration noise suppression device according to the embodiment of the present invention, an engine pulse is supplied to a waveform shaper 31 to remove noise and extract only a fundamental wave to form a waveform. Output signal from the heater 31
It is supplied to a multiplier 32, a 4 multiplier 33 and a 6 multiplier 34 to multiply the fundamental wave output from the waveform shaper 31 by 2 and 4
A signal multiplied and multiplied by 6 is obtained.

The output from the doubler 32 is a cosine wave generator 3
5a and a sine wave generator 35b to obtain a cosine wave and a sine wave signal having a frequency twice the fundamental wave. The sine wave generator 35b may be constituted by a delay unit that delays the output of the cosine wave generator 35a by π / 2 radians. The output from the quadrupler 33 is supplied to a cosine wave generator 36a and a sine wave generator 36b to obtain cosine and sine wave signals having a frequency four times the fundamental wave. The sine wave generator 36b may be constituted by a delay unit that delays the output of the cosine wave generator 36a by π / 2 radians. The output from the 6-multiplier 34 is supplied to a cosine-wave generator 37a and a sine-wave generator 37b to obtain a cosine-wave and sine-wave signal having a frequency six times the fundamental wave. The sine wave generator 37b is a cosine wave generator 37a
Can be constituted by a delay unit that delays the output of the signal by π / 2 radians.

The adaptive notch filter 7A includes a multiplier 7a1
, A pair of multipliers 7a2 and 7b2, a pair of multipliers 7a3 and 7b3, and an adder 7c1, a cosine wave signal having a frequency obtained by doubling the frequency of the engine pulse and an adaptive notch filter coefficient W01. Multiplied by the multiplier 7a1, the sine wave signal of the frequency twice the frequency of the engine pulse and the adaptive notch filter coefficient W11 'are multiplied by the multiplier 7b.
Multiplied by 1 and the cosine wave signal of the frequency obtained by quadrupling the frequency of the engine pulse by the adaptive notch filter coefficient W21 in the multiplier 7a2, and the sine wave signal of the frequency obtained by multiplying the engine pulse frequency by 4 and the adaptive notch Filter coefficient W
31 is multiplied by a multiplier 7b2, a cosine wave signal having a frequency that is six times the frequency of the engine pulse is multiplied by an adaptive notch filter coefficient W41 by a multiplier 7a3, and a sine wave having a frequency that is six times the frequency of the engine pulse The signal and the adaptive notch filter coefficient W51 are multiplied by a multiplier 7b3, and the output of the multiplier 7a1, the output of the multiplier 7b1, the output of the multiplier 7a2, the output of the multiplier 7b2, the output of the multiplier 7a3, and the output of the multiplier 7b3 The output and the output are added by an adder 7c1 and sent to the secondary vibration noise generator 3.

The ROM 10A stores an adaptive notch filter coefficient W for canceling the vibration noise in the vibration noise suppression unit 9 with respect to the signal of the frequency twice the frequency of the engine pulse.
01 ′ and W11 ′, an adaptive notch filter coefficient W for canceling the vibration noise in the vibration noise suppression unit 9 with respect to the signal for the frequency of the engine pulse quadrupled.
21 and W31, adaptive notch filter coefficients W41 and W51 for canceling the vibration noise in the vibration noise suppression unit 9 with respect to the frequency of the engine pulse being multiplied by 6
Are stored in advance corresponding to the frequency of the engine pulse, and the fundamental wave whose waveform has been shaped by the waveform shaper 31 is supplied to the address counter 11A and counted, and the count value of the address counter 11A is calculated. It is supplied to the ROM 10A as address designation data.

The adaptive notch filter coefficients stored in the ROM 10A are schematically shown by solid and broken lines in FIG.
In FIG. 1, (secondary) is the storage address position of the adaptive notch filter coefficients W01 'and W11',
The (fourth) display is the storage address position of the adaptive notch filter coefficients W21 and W31, and the (sixth) display is the storage address position of the adaptive notch filter coefficients W41 and W51.

In the first modified example of the active vibration noise suppression device according to the embodiment of the present invention configured as described above, the engine pulse is supplied to the waveform shaper 31. The engine pulse for each unit time whose waveform has been shaped is counted by the address counter 11A, and the address of the ROM 10A is designated by the count value of the address counter 11A, and the adaptive notch filter coefficients W01 ', W1 based on the frequency of the engine pulse from the ROM 10A.
1 ′, W21, W31, W41 and W51 are read out, set in the adaptive notch filter 7A, multiplied by the corresponding cosine wave signal and sine wave signal, and output by the adaptive notch filter 7A obtained by adding the multiplied outputs. The secondary vibration noise generator 3 is driven to cancel the vibration noise in the vibration noise suppression unit 9, that is, the vibration noise in the vehicle interior.

In this case, the adaptive notch filter coefficients W01 ', W1', W21, W read from the ROM 10A
Reference numerals 31, W41, and W51 denote adaptive notch filter coefficients for suppressing vibration noise based on the frequency of the engine pulse. The notch frequency in the vehicle interior due to the engine pulse is determined by the secondary vibration noise output from the secondary vibration noise generator 3. Noise is canceled out. It is not necessary to calculate the adaptive notch filter coefficients in real time for this cancellation.

In the first modified example of the active vibration noise suppressing device according to the embodiment of the present invention, the multipliers 32, 33, and 34 are each configured to multiply the frequency of the engine pulse by 2, 4, 4, or 6. The case where the multiplication is performed is illustrated, but the case where the engine has four cylinders is illustrated.
It is apparent that the present invention can be applied to other cases of multiplying by a times, b times, and c times.

Next, a description will be given of a second modified example of the active vibration noise suppression device according to one embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of a second modification of the active vibration noise suppression device according to one embodiment of the present invention.

A second modified example of the active vibration noise suppressing device according to one embodiment of the present invention is a secondary vibration noise generator for canceling vibration noise instead of the secondary vibration noise generator 3. This is an example where a plurality of actuators, for example, four actuators are used.

In a second modification of the active vibration noise suppression device according to one embodiment of the present invention, an engine pulse is supplied to a waveform shaper 31 to remove noise and to extract only a fundamental wave, and to perform waveform shaping. The output signal from the detector 31 is supplied to a cosine wave generator 38 to generate a cosine wave signal, and the fundamental wave is supplied to a sine wave generator 39 to generate a sine wave signal. A delay unit that receives the output of the cosine wave generator 38 instead of the sine wave generator 39 and delays the phase by π / 2 radians may be used.

The adaptive notch filter 7B includes adaptive notch filters 7B1 to 7B4.

The adaptive notch filter 7B1 includes a multiplier 7a4 for multiplying the cosine wave signal output from the cosine wave generator 38 by the adaptive notch filter coefficient W01, and an adaptive sine wave signal output from the sine wave generator 39. The multiplier 7b4 multiplies the output of the notch filter coefficient W11, and the adder 7c2 adds the output of the multiplier 7a4 and the output of the multiplier 7b4. The actuator 3a is driven by the output of the adaptive notch filter 7B1.

The adaptive notch filter 7B2 multiplies the cosine wave signal output from the cosine wave generator 38 by the adaptive notch filter coefficient W02 and the sine wave signal output from the sine wave generator 39. The multiplier 7b5 multiplies the notch filter coefficient W12, and the adder 7c3 adds the output of the multiplier 7a5 and the output of the multiplier 7b5. The actuator 3b is driven by the output of the adaptive notch filter 7B2.

The adaptive notch filter 7B3 multiplies the cosine wave signal output from the cosine wave generator 38 by the adaptive notch filter coefficient W03, and the sine wave signal output from the sine wave generator 39. The multiplier 7b6 multiplies the output of the notch filter coefficient W13, and the adder 7c4 adds the output of the multiplier 7a6 and the output of the multiplier 7b6. The actuator 3c is driven by the output of the adaptive notch filter 7B3.

The adaptive notch filter 7B4 multiplies the cosine wave signal output from the cosine wave generator 38 by the adaptive notch filter coefficient W04, and the sine wave signal output from the sine wave generator 39 The multiplier 7b7 multiplies the output of the notch filter coefficient W14, and the adder 7c5 adds the output of the multiplier 7a7 and the output of the multiplier 7b7. The actuator 3d is driven by the output of the adaptive notch filter 7B4.

The ROM 10B stores an adaptive notch filter coefficient W01 for canceling vibration noise in the vibration noise suppression unit 9 with respect to the fundamental wave signal output from the waveform shaper 31.
And W11, W02 and W12, W03 and W1
3, W04 and W14 are stored in advance corresponding to the frequency of the engine pulse, and the fundamental wave whose waveform has been shaped by the waveform shaper 31 is supplied to the address counter 11A to be counted, and the count value of the address counter 11A is counted as an address. The data is supplied to the ROM 10B as designated data.

In the second modified example of the active vibration and noise suppression device according to the embodiment of the present invention configured as described above, the engine pulse is supplied to the waveform shaper 31 so that the pulse is output every unit time. The number of engine pulses is counted by the address counter 11A, the address of the ROM 10B is designated by the count value of the address counter 11A, and the adaptive notch filter coefficients W01, W11, W based on the frequency of the engine pulse from the ROM 10B.
02, W12, W03, W13, W04, W14 are read out and the adaptive notch filters 7B1, 7B2, 7B
3, 7B4, the actuators 3a, 3b,
3c and 3d are driven to cancel the vibration noise caused by the engine pulse.

In this case, the adaptive notch filter coefficients W01, W1, W02, W1 read from the ROM 10B
Reference numerals 2, W03, W13, W04, and W14 denote adaptive notch filter coefficients for suppressing vibration noise in the vibration disturbance suppression unit 9 based on the frequency of the engine pulse, and the engine uses secondary vibration noise generated by the actuators 3a to 3d. The vibration noise in the vibration noise suppression unit 9 due to the notch frequency generated by the pulse is canceled. It is not necessary to calculate the adaptive notch filter coefficient in real time to cancel the vibration noise.

Next, a description will be given of a third modification of the active vibration noise suppression device according to the embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a third modified example of the active vibration noise suppression device according to one embodiment of the present invention.

A third modification of the active vibration noise suppression device according to one embodiment of the present invention is a variable gain control device that replaces the adaptive notch filter 7 in the active vibration noise suppression device according to one embodiment of the present invention. This is an example in the case of a configuration using a substantial adaptive notch filter including an amplifier 7d and a phase shifter 7e.

In a third modification of the active vibration noise suppression device according to one embodiment of the present invention, a cosine wave signal synchronized with the engine pulse is output from the cosine wave generator 5 upon receiving the engine pulse, and the cosine wave is generated. The generated cosine wave signal from the generator 5 is supplied to an amplifier 7d and multiplied by an amplification gain (hereinafter, also simply referred to as a gain) A times read from the ROM 10C,
The output from the amplifier 7d is supplied to the phase shifter 7e to
The phase is shifted by the phase shift amount φ read from 0C.

Here, in the ROM 10C, the frequency of the engine pulse obtained in advance by the development vehicle 12 or the like, that is, in advance, in correspondence with the engine speed as in the case of the active vibration noise suppression device according to the embodiment of the present invention, is stored. Adaptive notch filter coefficient W for canceling the obtained vibration noise
Gain A = √ ｛(W
0) ² + (W1) ² } and phase shift amount φ = arctan
(W1 / W0) is stored in the ROM 10C corresponding to the frequency of the engine pulse. Since the adaptive notch filter coefficient of the adaptive notch filter 7 is W0 for the cosine wave signal and the adaptive notch filter coefficient of the adaptive notch filter 7 is W1 for the sine wave signal, the gain A =
{(W0) ² + (W1) ² } and phase shift amount φ = arc
It can be easily understood that tan (W1 / W0).

Here, the rotation pulse of the crankshaft may be used instead of the engine pulse as in the active vibration noise suppression device according to the embodiment of the present invention.

On the other hand, the number of engine pulses per unit time is counted by the address counter 11 in response to the engine pulse, and the count value of the address counter 11 is used as the ROM 10C.
, The gain A and the phase shift amount φ based on the frequency of the engine pulse are read out from the ROM 10C and supplied to the amplifier 7d and the phase shifter 7e, respectively.

In the third modification of the active vibration and noise suppression device according to the embodiment of the present invention configured as described above, the number of engine pulses is supplied to the ROM 10C, and the number of engine pulses per unit time is reduced. The count is performed by the address counter 11, the address of the ROM 10C is designated by the count value of the address counter 11, and the gain A and the phase shift amount φ based on the frequency of the engine pulse are read from the ROM 10C.

On the other hand, the engine pulse is supplied to the cosine wave generator 5, and the cosine wave generator 5 outputs a cosine wave signal synchronized with the engine pulse. The generated cosine wave signal from the cosine wave generator 5 is supplied to the amplifier 7d, the amplitude of the cosine wave signal is multiplied by the gain A, and the phase of the amplified output from the amplifier 7d is shifted by the phase shift amount φ. When the output of the phaser 7e is 2
The vibration noise is supplied to the secondary vibration noise generator 3 to generate secondary vibration noise, and the vibration noise suppression unit 9 reduces the vibration noise of the frequency of the engine pulse.

However, the gain A and the phase shift φ read from the ROM 10C are the gain A and the phase shift φ based on the adaptive notch filter coefficient for suppressing the vibration noise based on the frequency of the engine pulse. The vibration noise in the vibration noise suppression unit 9 due to the engine pulse is canceled by the secondary vibration noise output from the heater 3. It is not necessary to calculate the gain A and the phase shift amount φ in real time for this cancellation.

[0079]

Next, an embodiment of an active vibration noise suppressing apparatus according to the present invention will be described.

FIG. 8 shows the configuration of a first embodiment of the active vibration noise suppression device according to the present invention.

In the first embodiment, a cosine wave generator (5), a delay unit (not shown), which constitutes the active vibration noise suppression device 20 according to the embodiment of the present invention, converts an engine pulse of the engine 41 into an engine pulse. 6), adaptive notch filter (7), ROM (10) and address counter (1)
In order to cancel the vibration of the actuator 45 for canceling the vibration of the intake pipe 42 of the engine 41 and the vibration of the exhaust pipe 43 of the engine 41 by the output from the adaptive notch filter 7, that is, the output of the controller 44. Is driven.

In the first embodiment, the vibration noise of the intake pipe 42 and the exhaust pipe 43 based on the vibration of the engine is generated by driving the actuators 45 and 46.
Notch filter coefficient W of the adaptive notch filter in controller 44 for canceling due to secondary vibration noise
0 and W1 are stored in advance in the ROM of the controller 44 corresponding to the frequency of the engine pulse, and when the engine pulse is supplied to the controller 44, the engine pulse per unit time is counted by the address counter in the controller 44, Controller 44
The address of the ROM in the controller 44 is designated by the count value of the address counter in the controller 44, the adaptive notch filter coefficients W0 and W1 are read out from the ROM in the controller 44, and the cosine wave signal and the sine wave signal synchronized with the engine pulse are applied. Notch filter coefficients W0 and W1 are multiplied, the multiplication results are added, and actuators 45 and 46 are driven by the added output,
Vibration noise of the intake pipe 42 and vibration noise of the exhaust pipe 43 due to engine vibration are suppressed.

Regarding the suppression of the vibration noise of the intake pipe 42, in the case of the non-suppression shown by the solid line and the alternate long and short dash line in FIG. 9 and the suppression result by the conventional suppression method, in the case of the first embodiment, FIG. As indicated by the broken line, the vibration noise of the intake pipe 42 due to the vibration of the engine 41 was suppressed.

FIG. 10 shows the configuration of a second embodiment of the active vibration noise suppressing apparatus according to the present invention.

In the second embodiment, the engine pulse of the engine 41 mounted on the mass-produced vehicle 12A is converted into a cosine wave generator (not shown) constituting the active vibration noise suppression device 20 according to the embodiment of the present invention. 5), a delay unit (6), an adaptive notch filter (7), a ROM (10) and an address counter (11) are supplied to a controller 44. The output from the adaptive notch filter, that is, the output of the controller 44, The active engine mounts 50A and 50B for canceling the vibration are driven.

In the second embodiment, the adaptive notch filter coefficients W0 and W1 of the adaptive notch filter for canceling the vibration noise of the engine 41 by the secondary vibration generated by driving the active engine mounts 50A and 50B are equal to the engine pulse. Are stored in advance in the ROM corresponding to the frequency of the engine, and when the engine pulse is supplied to the controller 44, the engine pulse per unit time is counted by the address counter in the controller 44, and the count value of the address counter in the controller 44 The ROM address in the controller 44 is specified, and the R
The adaptive notch filter coefficients W0 and W1 are read from the OM, multiplied by the cosine wave signal and the sine wave signal synchronized with the engine pulse and the adaptive notch filter coefficients W0 and W1, and the multiplication results are added. The active engine mounts 50A and 50B are driven,
Vibration noise based on the vibration of the engine 41 is suppressed.

[0087]

As described above, according to the active vibration noise suppression device of the present invention, the vibration noise in the vibration noise suppression unit is output from the secondary vibration noise generator driven by the output of the adaptive notch filter. The vibration noise is suppressed by the secondary vibration noise. In this case, the adaptive notch filter coefficient for canceling the vibration noise in advance may be read out from the storage means stored in advance and set as the adaptive notch filter, and it is not necessary to calculate the adaptive notch filter coefficient in real time. The active vibration noise suppression device can be provided in the ECU for controlling the fuel of the engine without the need for the DSP.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration for explaining the principle of an active vibration noise suppression device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration for showing an example of generating an adaptive notch filter coefficient in the active vibration noise suppression device according to one embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating an example of an adaptive notch filter coefficient stored in a ROM in the active vibration noise suppression device according to one embodiment of the present invention;

FIG. 4 is a block diagram showing a configuration of an active vibration noise suppression device according to one embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a first modified example of the active vibration noise suppression device according to one embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a second modified example of the active vibration noise suppression device according to one embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a third modification of the active vibration noise suppression device according to one embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a first example of the active vibration noise suppression device according to the embodiment of the present invention;

FIG. 9 is a characteristic diagram for explaining an operation of the first example of the active vibration noise suppression device according to the embodiment of the present invention;

FIG. 10 is a block diagram showing a configuration of a second example of the active vibration noise suppression device according to the embodiment of the present invention;

FIG. 11 is a block diagram showing a configuration of a conventional active vibration noise suppression device.

FIG. 12 is a block diagram showing another configuration of the conventional active vibration noise suppression device.

[Explanation of symbols]

3 Secondary vibration noise generator 3a-3d Actuator 5 Cosine wave generator 6 Delay unit 7, 7A-7C Adaptive notch filter 7a, 7a1-7a7, 7b, 7b1-7b7 Multiplier 7c, 7c1 7c5 Adder 7d Amplifier 7e Phase shifter 9 Vibration noise suppressor 10, 10A, 10B, 10C ROM 11, 11A Address counter 13 Potentiometer 14 A / D converter 15 DSP 16a, 16b Microphones 17a, 17b Speaker 19 Mixer 21 ECU 31 Waveform shaper 32 Multiplier 33 Quadrupler 34 6 Multiplier 41 Engine 42 Intake pipe 43 Exhaust pipe 44 Controller 45, 46 … Actuator

Claims (3)

[Claims] A cosine wave generator for generating a cosine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppression unit; and a sine wave generating a sine wave synchronized with the frequency of the vibration noise. Generating means, an adaptive notch filter to which a cosine wave generated from the cosine wave generator and a sine wave generated from the sine wave generating means are input, and noise generated in the vibration suppressing section based on the vibration noise of the vibration noise source Storage means for preliminarily storing an adaptive notch filter coefficient for suppressing noise at an address position based on the frequency of the vibration noise of the vibration noise source, and the storage based on a count value obtained by counting the frequency of the vibration noise of the vibration noise source. An address counter for specifying the address of the means, and a secondary which is driven by the output of the adaptive notch filter and suppresses the vibration noise in the vibration noise suppressing section. A secondary vibration noise generator for generating dynamic noise, wherein an adaptive notch filter coefficient stored in the storage means addressed by the count value of the address counter is set in the adaptive notch filter. Vibration noise suppression device. 2. A cosine wave generator for generating a cosine wave synchronized with the frequency of the vibration noise transmitted from the vibration noise source to the vibration noise suppression unit, and a sine wave generating a sine wave synchronized with the frequency of the vibration noise. Generating means, an adaptive notch filter to which a cosine wave generated from the cosine wave generator and a sine wave generated from the sine wave generating means are input, and noise generated in the vibration suppressing section based on the vibration noise of the vibration noise source Storage means for storing in advance an adaptive notch filter coefficient for suppressing noise generated in the vibration noise suppression unit based on the accelerator opening in an address position based on the frequency of vibration noise of the vibration noise source and the accelerator opening, and Addressing means for addressing the storage means based on the count value obtained by counting the frequency of the vibration noise of the vibration noise source and the accelerator opening A secondary vibration noise generator that is driven by an output of the adaptive notch filter to generate a secondary vibration noise that suppresses the vibration noise in the vibration noise suppression unit, wherein the secondary vibration noise is addressed by the addressing unit. An active vibration noise suppression device, wherein an adaptive notch filter coefficient stored in a storage unit is set in the adaptive notch filter. 3. A cosine wave generator for generating a cosine wave synchronized with the frequency of vibration noise transmitted from a vibration noise source to a vibration noise suppression unit, and receiving a cosine wave generated from the cosine wave generator. An adaptive notch filter comprising an amplifier for amplifying a wave and a phase shifter for shifting the phase of the output of the amplifier; and the vibration suppression based on the vibration noise of the vibration noise source driven by the output of the adaptive notch filter. A secondary vibration noise generator that generates a secondary vibration noise that suppresses the vibration noise in the vibration unit, and a secondary vibration noise generator that suppresses the noise generated in the vibration suppression unit based on the vibration noise of the vibration noise source. A storage means for storing in advance an amplifier gain and a phase shift amount of the phase shifter at an address position based on a frequency of the vibration noise of the vibration noise source; and a frequency of the vibration noise of the vibration noise source. And an address counter for specifying the address of the storage means based on the count value.The gain and the phase shift amount stored in the storage means addressed by the count value of the address counter are respectively determined by the amplifier and the amplifier. An active vibration and noise suppression device, which is set in the phase shifter.