JP4906787B2 - Active vibration noise control device - Google Patents

Description

  The present invention comprises an active vibration comprising a first cancellation signal generator for generating a first cancellation signal for a first noise event and a second cancellation signal generator for generating a second cancellation signal for a second noise event. In the noise control device, the identification signal is used to identify the first transfer characteristic until the first cancellation signal output from the first cancellation signal generator returns to the first cancellation signal generator as an error signal through the sound field. The present invention relates to an active vibration noise control apparatus.

  When the vehicle travels, the vibration of the wheels received from the road (road) is transmitted to the vehicle body via the suspension, and is excited by the acoustic resonance characteristics of the closed space such as the vehicle interior. Road noise having a peak of about [Hz] and a bandwidth of 20 to 150 [Hz] (a sound with a “go” sound, also called drumming noise) is generated. Further, due to the rotation of various rotating bodies such as the engine crank, transmission main shaft, counter shaft, propeller shaft and the like related to the operation of the engine, the rotational frequency of the rotating body is set in the vehicle interior during the operation of the vehicle. Related noises (for the sake of convenience, they are referred to as engine noises) are generated.

  In Patent Document 1, road noise, engine noise, and wind noise generated by the airflow flowing on the surface of the vehicle body at the evaluation point (listening point) where the microphone is arranged are noises actually generated. There has been proposed an active vibration noise control apparatus that determines the type and performs noise suppression control on the road noise, the engine booming noise, and / or the wind noise based on the determination result.

  In order to generate a canceling sound from the speaker for each noise event and reduce residual noise at the evaluation point due to interference between the canceling sound and each noise, the sound from the speaker to the microphone is reduced. It is desirable that a transfer characteristic is modeled and set in the active vibration noise control device, and a canceling signal corresponding to the canceling sound is generated in consideration of the set transfer characteristic (hereinafter also referred to as a simulated transfer characteristic). . In this case, transmission characteristics are measured (identification processing) in the vehicle production process, and the simulated transmission characteristics after the identification processing are set in the active vibration noise control device.

  In Patent Document 2, when measuring and setting vibration transmission characteristics in a vehicle, an inspection tool box is connected to an AEM (active engine mount) controller from the inspection tool box to the AEM controller. It has been proposed to instruct the start of identification inspection work (measurement of vibration transfer characteristics) and to display the result of the identification inspection work.

JP-A-7-104767 Japanese Patent Laid-Open No. 7-248781

  The active vibration noise control device of Patent Document 1 described above includes a first cancellation signal generator that generates a cancellation signal for canceling engine noise, and a second cancellation signal that generates a cancellation signal for canceling road noise. A signal generator and a third cancellation signal generator for generating a cancellation signal for canceling wind noise are provided, and the first to third cancellation signal generators are connected in parallel to a speaker and a microphone. .

  Therefore, each modeled simulated transfer characteristic set for each canceling signal generator differs depending on the operating state of each canceling signal generator (operation or stoppage of each canceling signal generator). Become.

  For example, the simulated transfer characteristic set in the first cancellation signal generator is a transfer characteristic of a path from the first cancellation signal generator through the speaker and the microphone, and the simulated transfer characteristic is (1) When the first to third cancellation signal generators are in operation, the transfer characteristics take into account the second and third cancellation signal generators, and (2) the first and second cancellation signal generators operate. When the first canceling signal generator is in operation, and (3) when the first and third canceling signal generators are in operation, the transfer characteristic considering the third canceling signal generator is used. (4) When only the first cancellation signal generator is operating, the transmission characteristic of the path from the first cancellation signal generator through the speaker and the microphone is obtained.

  Therefore, when the active vibration noise control apparatus has a plurality of canceling signal generators, it is desirable to identify the transfer characteristics in consideration of the operation state of each canceling signal generator.

  However, in the techniques of Patent Documents 1 and 2 described above, transfer characteristic identification processing is not performed in consideration of the operation state of each canceling signal generator.

  The present invention has been made in consideration of such problems, and provides an active vibration noise control device capable of identifying a transfer characteristic in accordance with the operating state of each cancellation signal generator. Objective.

The present invention generates a first reference signal having a frequency related to a first noise event, and simulates a first transfer characteristic until the first cancellation signal output by itself returns to itself as an error signal through the sound field. A first cancellation signal generator for generating the first cancellation signal based on a transfer characteristic;
A second reference signal having a frequency related to the second noise event is generated, and based on a second simulated transfer characteristic that simulates the second transfer characteristic until the second cancellation signal output by itself returns to itself as an error signal through the sound field. A second cancellation signal generator for generating the second cancellation signal;
In an active vibration noise control apparatus comprising:
The first simulated transfer characteristic varies depending on an operating state of the second cancellation signal generator,
A transfer characteristic identifier that identifies the first simulated transfer characteristic by performing identification processing of the first transfer characteristic using an identification signal;
The transfer characteristic identifier performs the identification process of the first transfer characteristic by switching the operation state of the second cancellation signal generator.

  According to the present invention, in the active vibration noise control apparatus that performs mute control for a plurality of noise events, when the first transfer characteristic identification process is performed in one cancellation signal generator (the first cancellation signal generator). In addition, the first transfer characteristic is identified according to the operation state of the other cancellation signal generator by switching the operation state of the other cancellation signal generator (the second cancellation signal generator) and performing identification processing. It becomes possible to do.

  Here, the transfer characteristic identifier performs the identification process of the first transfer characteristic by switching the operation or stop of the second cancellation signal generator, and further, based on command information from an external device, Preferably, the operating state of the second cancellation signal generator is switched.

  This makes it possible to identify the first transfer characteristic according to the operation or stop of the second cancellation signal generator. Further, by performing the identification process based on the command information from the outside, it is possible to perform the switching control of the operation state from the external device.

  According to the present invention, in the active vibration noise control apparatus that performs mute control for a plurality of noise events, when performing identification processing of the first transfer characteristic in one cancellation signal generator (first cancellation signal generator), The first transfer characteristic can be identified according to the operating state of the other cancellation signal generator by switching the operating state of the other cancellation signal generator (second cancellation signal generator) and performing the identification process. It becomes possible.

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

  FIG. 1 is a block diagram showing a configuration of an active vibration noise control apparatus 10 according to an embodiment of the present invention.

  The active vibration noise control apparatus 10 basically includes a first control signal generating unit (first control signal) for generating a first control signal (first canceling signal) Sc1 for generating a canceling sound that cancels the engine noise. Canceling signal generator) 14, and a second control signal generating unit (second canceling signal generator) 16 that generates a second control signal (second canceling signal) Sc2 for generating a canceling sound that cancels road noise. , Identifying (measuring or acquiring) a simulated transmission characteristic C ^ (first simulated transmission characteristic) simulating the transmission characteristic C (first transmission characteristic) of sound in the vehicle interior space (sound field) 24 from the speaker 26 to the microphone 22 And an identification signal generating unit 18 for generating an identification signal Scs for generating an identification sound used for generating the identification sound.

  Note that the simulated transfer characteristic C ^ actually includes the transfer characteristic C from the speaker 26 to the microphone 22 and is transmitted from the adder 40 side of the switch 52 in the first control signal generation unit 14 to the filter coefficient updater 46. Characteristics, that is, transmission characteristics of a route from the first control signal generation unit 14 via the speaker 26 and the microphone 22 (vehicle interior space 24), more specifically, the first control signal output by the first control signal generation unit 14 A simulated transmission characteristic that simulates the transmission characteristic C until Sc1 returns to the first control signal generation unit 14 as the error signal ea through the vehicle interior space 24.

  In this case, as shown in FIG. 1, the first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18 include an adder 40, a D / A converter 28, and an A / D converter 30. Are connected in parallel to the speaker 26 and the microphone 22. Therefore, as will be described later, the simulated transfer characteristic C ^ takes into account the second control signal generation unit 16 if (1) the second control signal generation unit 16 operates (outputs the second control signal Sc2). On the other hand, if (2) the second control signal generation unit 16 is stopped (the output of the second control signal Sc2 is stopped), the transfer characteristics when the second control signal generation unit 16 is not considered Become.

  The first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18 are configured in a controller 12 including a computer, and the CPU stores programs stored in a memory such as a ROM based on various inputs. It also operates as a function realization means for realizing various functions by executing.

  The microphone 22 that detects the identification sound and the residual noise due to the interference between the engine noise or the road noise and the canceling sound at a predetermined evaluation point (evaluation position, listening point) in the vehicle interior space 24 as an error signal ea. Is the position of the abdominal portion in the primary or secondary mode of the acoustic eigenmode in the front-rear direction of the vehicle interior space 24 {in the road noise of 20 to 150 [Hz] bandwidth, the vehicle of 42 [Hz] or 84 [Hz] It is provided at a position where the sound pressure of the standing wave of the room resonance sound is large. Specifically, if the vehicle is a sedan, the cross-section in the width direction of the vehicle is a closed space, for example, near the front position, for example, near the feet of the front seat, near the rearview mirror, behind the instrument panel, etc. is there.

  The first control signal Sc1 output from the first control signal generation unit 14, the second control signal Sc2 output from the second control signal generation unit 16, and / or the identification signal Scs output from the identification signal generation unit 18 Is supplied to the D / A converter 28 through the adder 40 as a digital signal control signal Sc, and is further supplied from the D / A converter 28 to the speaker 26 as an analog signal control signal Sc (output signal). .

  The speaker 26 outputs a canceling sound or identification sound to the vehicle interior space 24 based on the control signal Sc. That is, the speaker 26 outputs the first control signal Sc1 of the control signal Sc as an engine noise canceling sound, the second control signal Sc2 as a road noise canceling sound, and the identification signal Scs as an identification sound. Output. In this case, in order to enhance the surround effect of the 5ch sound, the speaker 26 is disposed, for example, on the left and right kick panel portions on the front seat side of the vehicle, on the lower center of the instrument panel, on the left and right body portions on the lower portion of the C pillar on the rear seat side. Is done. Note that the 0.1ch woofers have almost no directionality and are therefore arranged at arbitrary positions.

  The error signal ea output from the microphone 22 is converted into a digital signal error signal ea through the A / D converter 30, and is sent to the first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18. Supplied.

  The first control signal generation unit 14 is a circuit using a feed-forward type filtered-X LMS algorithm, and includes a frequency detector 42, a first reference signal generator 44, a filter coefficient updater (algorithm calculator) 46, 1 includes an adaptive filter 48 and a reference signal generator (filter) 50.

  A frequency detector 42 as a frequency counter detects a rotation frequency fe of an engine crank (rotary body) from an engine rotation signal (engine pulse) supplied from a fuel injection ECU (FIECU) (not shown). The first reference signal generator 44 generates a first reference signal Sr1 having a frequency of the rotation frequency fe. The reference signal generator 50 generates the reference signal r by applying (correcting or convolution) the first reference signal Sr1 to the preset simulation transfer characteristic C ^. The first adaptive filter 48 is a one-tap adaptive filter, and generates the first control signal Sc1 by multiplying the first reference signal Sr1 by the filter coefficient W1. Based on the reference signal r and the error signal ea, the filter coefficient updater 46 performs a first operation according to an adaptive control algorithm that minimizes the error signal ea, for example, an LMS (Least Mean Square) algorithm that is a kind of steepest descent method. The filter coefficient W1 of the adaptive filter 48 is updated.

The second control signal generation unit 16 is configured as an adaptive notch filter that functions as a bandpass filter (BPF), and includes a second reference signal generator 54, a second adaptive filter 56, a filter coefficient updater 58, a filter 60, and a subtraction. And a sample time delay unit (Z ⁻¹ ) 66.

  The second reference signal generator 54 generates a second reference signal Sr2 that is fixed according to the vehicle type, for example, synchronized with a road noise frequency fd [Hz] of about 42 [Hz]. The second adaptive filter 56 is a one-tap adaptive filter, and generates the second control signal Sc2 by multiplying the second reference signal Sr2 by the filter coefficient W2. The subtractor 64 generates a corrected error signal eb obtained by subtracting the second control signal Sc2 from the error signal ea. The one sample time delay unit 66 delays the correction error signal eb by one sampling and outputs it to the filter coefficient update unit 58 so that the filter coefficient update unit 58 can use the correction error signal eb at the next sampling. . Based on the second reference signal Sr2 and the correction error signal eb delayed by one sampling by the one sample time delay unit 66, the filter coefficient updater 58 follows an adaptive control algorithm (LMS algorithm) that minimizes the correction error signal eb. The filter coefficient W2 of the second adaptive filter 56 is updated.

  The filter 60 transmits sound from the speaker 26 to the microphone 22 (second characteristic) so that residual noise at the position of the microphone 22 due to interference between the canceling sound corresponding to the second control signal Sc2 and road noise is reduced. A filter for adjusting the phase and amplitude of the second control signal Sc2 based on a simulated transfer characteristic (second simulated transfer characteristic) simulating the transfer characteristic), and a phase adjuster for adjusting the phase and the amplitude And a gain adjuster to be adjusted. Note that the second simulated transfer characteristic is that the second control signal Sc2 output from the second control signal generation unit 16 actually returns to the second control signal generation unit 16 as an error signal ea through the vehicle interior space 24. This is a simulated transfer characteristic simulating the second transfer characteristic up to.

The identification signal generation unit 18 includes an identification frequency setting unit 68, a reference signal generator 70, a gain adjuster 72, an adaptive filter 74, a filter coefficient updater 76, a subtracter 80, and a one sample time delay unit (Z ⁻¹ ) 82. Have

  The identification frequency setting unit 68 outputs the set identification frequency fs (the same frequency as the rotation frequency fe). The reference signal generator 70 generates a reference signal Srs having an identification frequency fs. The gain adjuster 72 generates the identification signal Scs by multiplying the amplitude of the reference signal Srs by the gain G. The adaptive filter 74 generates a control signal Scc by multiplying the identification signal Scs by a filter coefficient Ws. The subtracter 80 generates a corrected error signal ec obtained by subtracting the control signal Scc from the error signal ea. The 1-sample time delay unit 82 has the same function as the 1-sample time delay unit 66, delays the correction error signal ec by 1 sampling, and outputs it to the filter coefficient updater 76. Based on the identification signal Scs and the correction error signal ec delayed by one sampling by the one sample time delay unit 82, the filter coefficient updater 76 adapts according to an adaptive control algorithm (LMS algorithm) that minimizes the correction error signal ec. The filter coefficient Ws of the mold filter 74 is updated.

  Further, the controller 12 includes an information communication device 36 connected to a personal computer (PC) 32 as an external device via a coupler 34 in the vehicle, and an operation determination device 38. The first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18 are provided with switches 52, 62, and 78 that are switch-controlled by the operation determiner 38, respectively. In this case, the information communication device 36, the operation determination device 38, the switches 52, 62, 78 and the identification signal generation unit 18 constitute a transfer characteristic identification device 90. The information communication device 36 is connected to a CAN (Car Area Network) as a vehicle network wine.

  The PC 32 has command information including the table of FIG. 2 indicating the operation state {operation (ON) or stop (OFF)} of the first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18. Then, when connected to the information communication device 36 via the coupler 34, the control command information Si including the patterns 0 to 6 (any one of the patterns) in FIG. 2 is transmitted to the information communication device 36. Thus, the identification processing by the transfer characteristic identifier 90 is started, and the active vibration noise control apparatus 10 is controlled so as to output the identification processing result (output data So as identification result information). In addition to the patterns 0 to 6 shown in the table of FIG. 2, the control command information Si includes the identification frequency fs set in the identification frequency setting unit 68 and the gain G set in the gain adjuster 72.

  The information communication device 36 outputs the pattern included in the received control command information Si to the operation determination device 38 and outputs the identification frequency fs and the gain G to the identification signal generation unit 18. The operation determination unit 38 outputs switching control signals Ss1, Ss2, and Sss based on the input pattern to the switches 52, 62, and 78, and turns on or off the switches 52, 62, and 78.

  Accordingly, if the switches 52, 62, and 78 are turned on based on the switching control signals Ss1, Ss2, and Sss, the first control signal Sc1, the second control signal Sc2, and the identification signal Scs are output to the adder 40. The control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18 are in an operating state (an operating state). On the other hand, if the switches 52, 62, 78 are turned off based on the switching control signals Ss1, Ss2, Sss, the first control signal Sc1, the second control signal Sc2, and the identification signal Scs are output to the adder 40. Therefore, the first control signal generation unit 14, the second control signal generation unit 16, and the identification signal generation unit 18 are stopped.

  In FIG. 2, patterns 4 to 6 surrounded by a thick frame generate an identification signal Scs by the identification signal generation unit 18 and simulate transmission based on the identification signal Scs and the error signal ea (correction error signal ec). The pattern for performing the identification process which identifies (measures or acquires) the characteristic C ^ is shown.

  That is, in the identification process, the identification frequency fs in the control command information Si is set in the identification frequency setting unit 68, the gain G in the control command information Si is set in the gain adjuster 72, and the pattern 4 To 6 in a state where the switches 52, 62, 78 are turned on or off according to any one pattern (the switch 78 is always turned on in the identification process), the control signal Sc (identification signal Scs) is output from the speaker 26. The corresponding identification sound (including sound) is output to the vehicle interior space 24, and the microphone 22 outputs an error signal ea corresponding to the identification sound (including the sound) as an error signal for identification processing.

  As described above, the filter coefficient updater 76 updates the filter coefficient Ws of the adaptive filter 74 based on the identification signal Scs and the correction error signal ec so that the correction error signal ec is minimized. The filter coefficient Ws at the predetermined value is the simulated transfer characteristic C ^ at the set identification frequency fs.

  In this case, the simulated transfer characteristic C ^ is (1) in the case of pattern 4, the first control signal generation unit 14 when both the first control signal generation unit 14 and the second control signal generation unit 16 are off (stopped). (2) In the case of pattern 5, the first control signal generation unit 14 is off and the second control signal generation unit 16 is on (operation). The transmission characteristic takes into account the second control signal generation unit 16 on the route from the control signal generation unit 14 through the vehicle interior space 24. (3) In the case of pattern 6, the first control signal generation unit 14 is turned on and 2 When the control signal generation unit 16 is off, the transmission characteristic of the route from the first control signal generation unit 14 through the vehicle interior space 24 is obtained.

  The operation of the active vibration noise control apparatus 10 configured as described above will be described with reference to FIGS.

  Here, the identification process of the simulated transfer characteristic C ^ in the active vibration noise control apparatus 10 will be described.

  In step S1 of FIG. 3, the information communication device 36 (see FIG. 1) determines whether or not the control command information Si has been received.

  If it is determined in step S1 that the control command information Si has been received (YES in step S1), the information communicator 36 then determines whether or not the pattern in the control command information Si is patterns 4-6. (Step S2).

  If it is determined in Step S2 that the patterns are 4 to 6 (YES in Step S2), the information communication device 36 next determines whether or not the pattern in the control command information Si is the pattern 4 (Step S2). S3).

  If it is determined in step S3 that the pattern 4 is present (YES in step S3), the information communicator 36 outputs the information of the pattern 4 to the operation determiner 38 and also identifies the identification frequency fs included in the control command information Si. And the gain G are output to the identification signal generation unit 18.

  The operation determination unit 38 outputs the switching control signals Ss1, Ss2, and Sss based on the input pattern 4 to the switches 52, 62, and 78, respectively. As a result, the switch 52 is turned off based on the switching control signal Ss1, so that the first control signal generation unit 14 reaches a stopped state (step S4). Further, since the switch 62 is turned off based on the switching control signal Ss2, the second control signal generation unit 16 is also stopped (step S5). Furthermore, since the switch 78 is turned on based on the switching control signal Sss, the identification signal generation unit 18 uses the identification signal Scs based on the identification frequency fs and the gain G from the information communication device 36 to be described later. Processing is performed (step S6).

  If it is determined in step S3 that the pattern is not pattern 4 (NO in step S3), the information communication device 36 next determines whether or not the pattern is pattern 5 (step S7). If it is determined in step S7 that the pattern is 5 (YES in step S7), the information communicator 36 outputs the information of the pattern 5 to the operation determiner 38 and the identification frequency fs included in the control command information Si and The gain G is output to the identification signal generation unit 18.

  The operation determiner 38 outputs switching control signals Ss1, Ss2, and Sss based on the input pattern 5 to the switches 52, 62, and 78, respectively. Thereby, since the switch 52 is turned off based on the switching control signal Ss1, the first control signal generation unit 14 is brought into a stopped state (step S8). Further, since the switch 62 is turned on based on the switching control signal Ss2, the second control signal generation unit 16 reaches an operating state in which the second control signal Sc2 can be output (step S9). Furthermore, since the switch 78 is turned on based on the switching control signal Sss, the identification signal generation unit 18 performs the identification process in step S6.

  Further, if it is determined in step S7 that the pattern is not pattern 5 (NO in step S7), the information communication device 36 regards it as pattern 6, outputs the information of this pattern 6 to the operation determination unit 38, and performs control. The identification frequency fs and the gain G included in the command information Si are output to the identification signal generation unit 18.

  The operation determiner 38 outputs switching control signals Ss1, Ss2, and Sss based on the input pattern 6 to the switches 52, 62, and 78, respectively. As a result, the switch 52 is turned on based on the switching control signal Ss1, so that the first control signal generation unit 14 reaches an operating state in which the first control signal Sc1 can be output (step S10). Further, since the switch 62 is turned off based on the switching control signal Ss2, the second control signal generation unit 16 reaches a stopped state (step S11). Furthermore, since the switch 78 is turned on based on the switching control signal Sss, the identification signal generation unit 18 performs the identification process in step S6.

  And after the identification process in step S6, the active vibration noise control apparatus 10 returns to the process of step S1.

  If the pattern 0 to 3 is NO in step S2 (NO in step S2), the active vibration noise control apparatus 10 performs the mute control for engine noise or road noise based on the patterns 0 to 3, that is, identification. Processing other than the processing is performed (step S12), and then the processing returns to step S1.

  Moreover, if the control command information Si cannot be received in step S1 (NO in step S1), the active vibration noise control device 10 does not execute the processes after step S2.

  FIG. 4 is a flowchart showing details of the identification process in step S6.

  First, the identification signal generation unit 18 sets the identification frequency fs indicated by the control command information Si in the identification frequency setting unit 68 (step S21) and sets the gain G in the gain adjuster 72 (step S22).

  Thereby, the reference signal generator 70 generates the reference signal Srs of the set identification frequency fs (step S23), and the gain adjuster 72 multiplies the reference signal Srs by the set gain G to obtain the identification signal Scs. Generate (step S24). The generated identification signal Scs is output from the switch 78 to the speaker 26 via the adder 49 and the D / A converter 28, and is output from the speaker 26 to the vehicle interior space 24 as an identification sound.

  Then, the filter coefficient updating unit 76 updates the filter coefficient Ws of the adaptive filter 74 based on the identification signal Scs and the correction error signal ec delayed by one sampling by the one sample time delay unit 82 (step S25). . The adaptive filter 74 multiplies the identification signal Scs by the filter coefficient Ws to generate a control signal (filter output signal) Scc (step S26).

  On the other hand, the microphone 22 detects sound (including identification sound) in the vehicle interior space 24 (step S27), and uses the detected sound as an error signal ea via the A / D converter 30, the first control signal generation unit 14, It outputs to the 2nd control signal generation unit 16 and the identification signal generation unit 18 (step S28). The subtracter 80 generates a correction error signal ec obtained by subtracting the control signal Scc from the error signal ea, and the one-sample time delay unit 82 delays the correction error signal ec by one sampling and outputs it to the filter coefficient updater 76. .

  Therefore, the filter coefficient updating unit 76 is until the correction error signal ec becomes minimum at the identification frequency fs set in the identification frequency setting unit 68 {until a determination result of YES in step S29 (ec ≦ predetermined value)}. The processing of steps S25 to S29 is repeatedly executed to update the filter coefficient Ws of the adaptive filter 74.

  When the correction error signal ec is minimized (YES in step S29), the identification signal generation unit 18 uses the filter coefficient Ws of the adaptive filter 74 with ec ≦ predetermined value as a simulated transfer characteristic at the identification frequency fs. C ^ is regarded (acquired as), and the data of the obtained simulated transfer characteristic C ^ is output to the information communication device 36 in association with the identification frequency fs and the gain G. The information communicator 36 transmits (outputs) the input data of the simulated transfer characteristic C ^ as output data (identification result information) So to the PC 32 via the coupler 34 (step S30).

  Upon receiving the output data So, the PC 32 transmits control command information Si including the next identification frequency fs and gain G to the information communication device 36 via the coupler 34, and the information communication device 36 receives the received control command information Si. Is output to the operation determination unit 38 and the identification signal generation unit 18. When the identification signal generation unit 18 receives the control command information Si (step S31), the identification signal generation unit 18 returns to step S21, and performs the processing subsequent to step S21 again for the next identification frequency fs and gain G.

  FIG. 5 is an example of the output data So obtained by the PC 32 by the process of FIG. 4, and shows the real part and the imaginary part of the simulated transfer characteristic C ^ when the identification frequency fs is 30 [Hz] to 39 [Hz]. .

  The PC 32 uses the received output data So as a modeled simulated transfer characteristic C ^ including the transfer characteristic C of sound from the speaker 26 to the microphone 22, and through the coupler 34 and the information communication device 36 in the vehicle production process. Thus, the simulated transfer characteristic C ^ is set in the reference signal generator 50 of the active vibration noise control apparatus 10 mounted on each vehicle.

  As described above, the active vibration noise control apparatus 10 according to this embodiment generates the first reference signal Sr1 of the rotational frequency fe related to the engine noise, and the first control signal Sc1 output by itself is the speaker 26. The first control signal for generating the first control signal Sc1 based on the simulated transfer characteristic C ^ that simulates the sound transfer characteristic C until it returns to itself as the error signal ea via the vehicle interior space 24 from the microphone 22 to the microphone 22 The generation unit 14 generates a second reference signal Sr2 having a road noise frequency fd related to road noise, and the second control signal Sc2 output by the generation unit 14 passes through the vehicle interior space 24 from the speaker 26 to the microphone 22 to generate an error signal ea. Second control for generating the second control signal Sc2 based on the simulated transfer characteristic that simulates the transfer characteristic of sound until it returns to itself And a No. generation unit 16.

  In this case, the active vibration noise control apparatus 10 further includes a transfer characteristic identifier 90 for specifying the simulated transfer characteristic C ^ by performing identification processing of the transfer characteristic C (simulated transfer characteristic C ^) using the identification signal. The transfer characteristic identifier 90 switches the operating states of the first control signal generation unit 14 and the second control signal generation unit 16 to perform the identification process of the simulated transfer characteristic C ^.

  As a result, in the active vibration noise control device 10 that performs mute control for a plurality of noise events (engine noise and road noise), the simulated transfer characteristic C set in the reference signal generator 50 of the first control signal generation unit 14. When performing the identification process of ^, the first control signal generation unit 14 and the second control signal generation are performed by performing the identification process by switching the operation state of the first control signal generation unit 14 and the second control signal generation unit 16. The simulation transfer characteristic C ^ according to the operation state of the unit 16 can be identified.

  Further, the transfer characteristic identifier 90 switches the operation or stop of the first control signal generation unit 14 and the second control signal generation unit 16 by turning the switches 52 and 62 on or off, thereby identifying the simulated transfer characteristic C ^. I do. Furthermore, the operating state of the first control signal generation unit 14 and the second control signal generation unit 16 is switched due to receiving control command information Si related to the identification process from the PC 32 via the coupler 34.

  Thereby, it is possible to identify the simulated transfer characteristic C ^ according to the operation or stop of the first control signal generation unit 14 and the second control signal generation unit 16. In addition, since the identification process is performed based on the control command information Si from the outside, the operation or the stop switching control can be performed from the PC 32.

  Further, the active vibration noise control device 10 outputs a residual noise due to interference between the canceling sound and the engine noise or road noise as an error signal, and a speaker 26 that outputs the first control signal Sc1 or the second control signal Sc2 as a canceling sound. and the identification signal generation unit 18 constituting the first control signal generation unit 14, the second control signal generation unit 16, and the transfer characteristic identifier 90, the speaker 26 and the microphone 22. The transfer characteristic identifier 90 outputs the control signal Sc output to the speaker 26 as an output signal when performing the identification process of the simulated transfer characteristic C ^, from the first control signal generation unit 14. The transfer characteristic of the route through the speaker 26 and the microphone 22 is changed to the transfer characteristic of the output signal (simulated transmission of the control signal Sc). A characteristic C ^), performs the simulated transfer characteristics C ^ identification process.

  Thereby, in the active vibration noise control apparatus 10 including the speaker 26 and the microphone 22, the simulated transfer characteristic C ^ is accurately identified according to the operation state of the first control signal generation unit 14 and the second control signal generation unit 16. It becomes possible.

  Furthermore, when the gain G is included in the control command information Si and the filter coefficient Ws is small, the amplitude of the identification signal Scs is increased by the gain G of the gain adjuster 72, whereby the error signals ea and ec in the identification process are increased. The detection resolution is improved, and the identification accuracy of the simulated transfer characteristic C ^ can be improved. That is, it is possible to perform identification processing of the simulated transfer characteristic C ^ with a wider dynamic range.

  Of course, the present invention is not limited to the above-described embodiment, and various modifications as described below are possible based on the description in the specification and the drawings.

  That is, the reference signal Srs for each identification frequency fs may be further included in the control command information Si, and the identification signal may be directly set in the reference signal generator 70 during the identification process. .

  Furthermore, each of the first reference signal generator 44, the second reference signal generator 54, and the reference signal generator 70 may be configured as a sine wave generator. The first reference signal generator 44, the second reference signal generator 54, and the reference signal generator 70 are respectively configured as a sine wave generator and a cosine wave generator, and the adaptive filters 48, 56, 74 are A sine wave signal generated by a sine wave generator (adaptation type) may be used as a notch filter and a cosine wave signal generated by a cosine wave generator (adaptation type) as a notch filter.

  Furthermore, in this embodiment, it is determined based on the patterns 0 to 6 in the control command information Si whether the identification process is performed or whether the muffling control is performed on the engine noise or road noise (see FIG. 3), instead of this configuration, if the patterns 4 to 6 cannot be received even after a lapse of a fixed time after the identification processing start command is received from the PC 32 via the coupler 34 to the information communication device 36, Silence control may be performed. Alternatively, the identification process is started due to the reception of the start command, and if the patterns 4 to 6 cannot be received even after a predetermined time has elapsed from the reception time of the start command, the mute control is performed after the identification process is stopped. May be performed.

It is a block diagram which shows the structure of the active vibration noise control apparatus which concerns on one Embodiment of this invention. It is a list which shows the operation state of a 1st control signal generation unit, a 2nd control signal generation unit, and an identification signal generation unit. 2 is a flowchart for explaining a simulation transfer characteristic identification process in the active vibration noise control apparatus of FIG. 1; It is a flowchart which shows the detail of the identification process of FIG.3 S6. FIG. 5 is a table showing simulated transfer characteristic data acquired by the identification processing of FIGS. 3 and 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Active vibration noise control apparatus 14 ... 1st control signal generation unit 16 ... 2nd control signal generation unit 18 ... Identification signal generation unit 22 ... Microphone 26 ... Speaker 32 ... PC 36 ... Information communication device 38 ... Operation determination device 52 62, 78 ... switch 68 ... identification frequency setter 70 ... reference signal generator 72 ... gain adjuster 74 ... adaptive filter 76 ... filter coefficient updater 80 ... subtractor 82 ... 1 sample time delay 90 ... transfer characteristic identification vessel

Claims (3)

A first reference signal having a frequency related to the first noise event is generated, and based on a first simulated transfer characteristic simulating the first transfer characteristic until the first cancellation signal output by itself returns to itself as an error signal through the sound field. A first cancellation signal generator for generating the first cancellation signal;
A second reference signal having a frequency related to the second noise event is generated, and based on a second simulated transfer characteristic that simulates the second transfer characteristic until the second cancellation signal output by itself returns to itself as an error signal through the sound field. A second cancellation signal generator for generating the second cancellation signal;
In an active vibration noise control apparatus comprising:
The first simulated transfer characteristic varies depending on an operating state of the second cancellation signal generator,
A transfer characteristic identifier that identifies the first simulated transfer characteristic by performing identification processing of the first transfer characteristic using an identification signal;
The active vibration noise control device, wherein the transfer characteristic identifier performs identification processing of the first transfer characteristic by switching an operation state of the second cancellation signal generator. The active vibration noise control apparatus according to claim 1,
The active vibration noise control apparatus, wherein the transfer characteristic identifier performs the first transfer characteristic identification process by switching between operation and stop of the second cancellation signal generator. The active vibration noise control apparatus according to claim 1,
The active vibration noise control device, wherein the transfer characteristic identifier switches the operation state of the second cancellation signal generator based on command information from an external device.

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