JP3742702B2 - Active vibration suppression device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an active vibration suppressing device that suppresses vehicle interior noise of a vehicle, and more particularly to an active vibration suppressing device that suppresses vibrations caused by multiple events such as road noise, booming noise, and idle noise in a vehicle.
[0002]
[Prior art]
In this specification, the term “vibration” is used to mean “noise”.
[0003]
As one of measures against vehicle interior vibration, an active vibration suppression device (also referred to as ANC) that suppresses vibration in the vehicle interior by generating vibration in the opposite phase to that in the vehicle interior is known.
[0004]
In a conventional active vibration suppression device, vibration from a vehicle tire, so-called vehicle interior vibration suppression based on so-called road noise, vehicle drive system vibration, so-called booming noise suppression, vehicle interior vibration generated during idling. For suppression, independent feedforward control systems are configured, and a secondary sound source device installed in a vehicle interior driven by the output from the feedforward control system is driven to suppress vibrations.
[0005]
This example is as shown in the schematic diagram of the vehicle in which the conventional active vibration suppressing device shown in FIG. 6 is installed and the block diagram shown in FIG. FIG. 7 is a block diagram corresponding to the active vibration suppressing device shown in FIG.
[0006]
The conventional active vibration suppression device shown in FIGS. 6 and 7 detects the vibration of the suspension by the vibration detector 1, and feeds for vibration suppression based on road noise using the output from the vibration detector 1 as a road noise reference signal. Based on the output of the feedforward control circuit 27, the speaker 3 provided in the vehicle interior is driven to suppress the vibration in the vehicle interior based on the road noise, and the vibration of the engine is detected by the vibration detector 7. The output from the vibration detector 7 while the vehicle is running is supplied to the feedforward control circuit 28 for suppressing vibration based on the muffled sound as a muffled sound reference signal, and based on the output of the feedforward control circuit 28 The speaker 6 provided in the vehicle is driven to suppress vibrations in the passenger compartment based on the booming noise, and vibration during idle operation is suppressed. The output from the detector 7 is supplied as an idle noise reference signal to a feedforward control circuit 29 for vibration suppression based on idle noise, and a speaker 9 provided in the vehicle interior is driven based on the output of the feedforward control circuit 29. This suppresses vibrations in the passenger compartment due to idle noise.
[0007]
Here, the vibration detectors 1 and 7 send output signals as serial digital signals, and the speakers 3, 6 and 9 convert the supplied serial digital signals into analog signals and are driven by the converted analog signals.
[0008]
In FIG. 6, a part of the transmission path of the generated sound from each speaker 3, 6, 9 as the secondary sound source is schematically shown by a solid line arrow, and a part of the transmission path of the transmission sound from the noise source is indicated by a broken line. This is schematically indicated by an arrow.
[0009]
In FIG. 7, reference numeral 11 denotes a transmission element of a transmission system from a vibration (primary sound) generation position based on road noise to a vibration suppression target position in the passenger compartment, for example, a head position of an occupant, and reference numeral 14 denotes a booming sound. Reference numeral 17 denotes a transmission element of a transmission system from a vibration (primary sound) generation position to a vibration suppression target position in the vehicle interior. Reference numeral 17 denotes a vibration (primary sound) generation position based on idle noise to a vibration suppression target position in the vehicle interior. Each of the transmission elements of the transmission system is schematically shown.
[0010]
Reference numeral 12 denotes a transmission element of the transmission system from the position of the speaker 3 (secondary sound source) to the vibration suppression target position in the vehicle interior. Reference numeral 15 denotes the position of the speaker 6 (secondary sound source) to the vibration suppression target position in the vehicle interior. , 18 schematically shows the transmission elements of the transmission system from the position of the speaker 9 (secondary sound source) to the vibration suppression target position in the passenger compartment.
[0011]
Furthermore, reference numeral 13 denotes a residual sound detection unit that is the difference between the vibration sound based on the road noise at the vibration suppression target position and the vibration sound from the speaker 3, and 16 denotes the booming sound at the vibration suppression target position and the vibration sound from the speaker 6. , 19 schematically shows a residual sound detection unit, which is a difference between idle noise at the vibration suppression target position and vibration sound from the speaker 9, and 20 is a residual sound detection unit at the vibration suppression target position. A sound detection part is shown typically. Reference numeral 26 denotes a vehicle.
[0012]
[Problems to be solved by the invention]
In the conventional active vibration suppression device described above, a plurality of independent control systems are required to suppress vibrations in the vehicle interior, and when these are mounted on a single vehicle, the space required for control system installation increases. In addition, there is a problem that the weight increases due to the installation of the active vibration suppression device and the cost becomes high.
[0013]
In addition, in order to solve these problems, if it is attempted to suppress the vibration in the vehicle interior based on road noise, booming noise, and idle noise with only one control system, the amount of calculation in the control system becomes enormous, and control sampling is performed. There is also a problem that the frequency and control accuracy are lowered, and that the causality of the feedforward type noise suppression device cannot be satisfied.
[0014]
An object of the present invention is to provide an active vibration suppression device capable of suppressing vibration in a vehicle interior based on a plurality of events such as road noise, booming noise, and idle noise with a single control system.
[0015]
[Means for Solving the Problems]
  According to the present inventionClaim 1Active vibration suppression deviceAn acceleration detector that is provided on the ceiling of the passenger compartment and detects the resonance of the passenger compartment ceiling together with the acceleration of the vehicle, and a drive system vibration detector that detects vibration of the vehicle drive systemVibration detection means for detecting vibration from each vibration source of the vehicle separately;
  An output signal from each of the vibration detection means is input as a reference signal, and a canceling signal having a vibration transmission characteristic having an opposite phase to each vibration transmission characteristic from each vibration source to the vehicle interior corresponds to the input reference signal. Vibration suppression signal generating means having a coefficient multiplier in which a coefficient corresponding to each reference signal is set as a multiplication coefficient,
  The vehicle traveling state is determined, and an output signal from the vibration detecting means selected based on the determined traveling state is sent as a reference signal to the vibration suppression signal generating unit, and the coefficient multiplier is set to the determined traveling state. A traveling state determination means for switching to a coefficient multiplier of a multiplication coefficient based on
  A canceling vibration generator provided in the passenger compartment and driven by a canceling signal output from the vibration suppression signal generating means;,
  With,
  When it is determined from the output signal of the acceleration detector that the traveling state determination means is an acceleration within a predetermined range in which the vehicle compartment ceiling resonates, the driving state determination unit selects the output signal from the acceleration detector as a reference signal, and If it is determined that the four-wheel drive is switched based on the switching of the drive system, the output signal from the drive system vibration detector is added to form a new reference signal,
  It is characterized by.
  The active vibration suppression device according to claim 2 according to the present invention includes vibration detection means for individually detecting vibration from each vibration source of the vehicle,
  An output signal from each of the vibration detection means is input as a reference signal, and a canceling signal having a vibration transmission characteristic having an opposite phase to each vibration transmission characteristic from each vibration source to the vehicle interior corresponds to the input reference signal. Vibration suppression signal generating means having a coefficient multiplier in which a coefficient corresponding to each reference signal is set as a multiplication coefficient,
  The vehicle traveling state is determined, and an output signal from the vibration detecting means selected based on the determined traveling state is sent as a reference signal to the vibration suppression signal generating unit, and the coefficient multiplier is set to the determined traveling state. A traveling state determination means for switching to a coefficient multiplier of a multiplication coefficient based on
  A canceling vibration generator provided in the passenger compartment and driven by a canceling signal output from the vibration suppression signal generating means;
  With
  When it is determined that the travel state has changed based on the travel state determined by the travel state determination means, the coefficient multiplier is used to determine the change in the coefficient multiplier using an initial value determined in advance according to the new travel state determined to have changed. Performing a coefficient update operation,
  It is characterized by.
[0016]
  According to the present inventionClaim 1According to the active vibration suppressing device, the traveling state of the vehicle is determined by the traveling state determining unit, the output signal from the vibration detecting unit is selected based on the determined traveling state, and the output signal from the selected vibration detecting unit is selected. Is sent as a reference signal to the vibration suppression signal generating means, and the multiplication coefficient of the coefficient multiplier is switched to the coefficient multiplier of the multiplication coefficient based on the determined running state.The Further, when it is determined from the output signal of the acceleration detector that the acceleration is within a predetermined range in which the vehicle compartment ceiling resonates, the output signal from the acceleration detector is selected as a reference signal, and the vehicle is driven. When it is determined that the four-wheel drive is switched based on the switching of the method, the output signal from the drive system vibration detector is added to become a new reference signal,Vibration in the passenger compartment is suppressed.
  According to the active vibration suppressing device of the second aspect of the present invention, when it is determined that the traveling state has changed based on the traveling state determined by the traveling state determining means, a new one determined to have changed is provided. A coefficient update operation of the coefficient multiplier is performed using an initial value determined in advance according to the running state.
[0017]
  Thus, according to the present inventionClaim 1According to the active vibration suppression device, the vehicle driving mode is determined, the event for performing noise suppression control is switched based on the determined driving mode, and the vehicle interior noise suppression control based on the event corresponding to the driving mode is switched. Therefore, the control system can be combined into one, and the cost, weight, and required space can be reduced.
  Furthermore, according to the active vibration suppression device of the second aspect of the present invention, when the coefficient change of the coefficient multiplier is performed based on the determined traveling state, it is determined that the determined traveling state has changed. In some cases, the coefficient update operation of the coefficient multiplier is performed using an initial value that is determined in advance according to a new driving state that has been determined to have changed, so that the amount of control is reduced and the speed of control is increased. The
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an active vibration suppression device according to the present invention will be described with reference to embodiments.
[0019]
FIG. 1 is a schematic diagram of a vehicle in which an active vibration suppression device according to an embodiment of the present invention is installed, and shows a case of two-wheel drive. 2 is a block diagram of the active vibration suppressing device according to the embodiment of the present invention shown in FIG.
[0020]
An active vibration suppression device according to an embodiment of the present invention detects vibration of a suspension by a vibration detector 1, supplies an output from the vibration detector 1 to a controller 2 as a road noise reference signal, and controls engine vibration. Detected by the vibration detector 7, the output from the vibration detector 7 during traveling of the vehicle is supplied to the controller 2 as a booming sound reference signal, and the output from the vibration detector 7 during idle operation is supplied to the controller 2 as an idle noise reference signal. The vehicle is driven by the speakers 3, 6 and 9 as secondary sound sources provided in the vehicle interior based on the output from the controller 2 to suppress the vehicle interior vibration based on road noise and Suppresses vibrations in the room and suppresses vibrations in the passenger compartment based on idle noise.
[0021]
On the other hand, the output from the speed detector 31 that detects the speed of the vehicle 26 and the output from the acceleration detector 32 that detects the acceleration of the vehicle 26 are supplied to the controller 2 to set the travel mode based on the speed and acceleration of the vehicle 26. Determine. Here, the acceleration detector 32 is provided on the ceiling of the passenger compartment to detect acceleration and resonance of the passenger compartment ceiling plate. This is because vibration based on resonance of the ceiling plate can be detected at a certain vehicle speed and a certain engine speed.
[0022]
Here, the vibration detectors 1 and 7 send output signals as serial digital signals, and the speakers 3, 6 and 9 convert the supplied serial digital signals into analog signals and are driven by the converted analog signals. It is the same as the case of.
[0023]
In FIG. 1, a part of the transmission path of the sound generated from each speaker 3, 6, 9 as the secondary sound source is schematically shown by a solid line arrow, and a part of the transmission path of the transmission sound from the noise source is shown by a broken line. This is schematically indicated by an arrow.
[0024]
As shown in FIG. 2, the controller 2 receives the reference signal and outputs the FIR type digital filter 34 that drives the speakers 3, 6 and 9 by the output, the output of the speed detector 31 and the output of the acceleration detector 32. A travel mode switching controller 35 that determines the travel mode and generates a switching signal for switching the reference signal and the coefficient of the digital filter 34 based on the determined travel mode is provided.
[0025]
The digital filter 34 extracts one reference signal from among the road noise reference signal, the booming noise reference signal, and the idle noise reference signal based on the switching signal output from the traveling mode switching controller 35, and substantially performs the digital filter 34. Switching means 36 as input, unit delay elements 39a, ..., 39n connected in series to which an input signal is supplied via the switching means 36, and input signals and unit delay elements input via the switching means 36 39a,..., 39n are supplied separately, and an amplifier 38a amplifies the input signal with a preset gain for suppressing vehicle interior vibration based on road noise.₀..., 38a_nSimilarly, the input signal input through the switching means 36 and the output signals from the unit delay elements 39a,..., 39n are separately supplied and set in advance to suppress vibrations in the vehicle interior based on the booming noise. Amplifier 38b for amplifying input signal with gain_O..., 38b_nSimilarly, the input signal input through the switching means 36 and the output signals from the unit delay elements 39a, ..., 39n are supplied separately and preset in order to suppress vibrations in the vehicle interior based on idle noise. Amplifier 38c for amplifying input signal with gain₀..., 38c_nAnd.
[0026]
Here, the amplifier 38a₀..., 38a_n38b_O..., 38b_n38c₀..., 38c_nIs a coefficient multiplier, and its gain corresponds to the multiplication coefficient of the coefficient multiplier.
[0027]
The digital filter 34 further includes an amplifier 38a.₀38b₀And 38c₀Switching means 37a for taking out one of the output signals in synchronization with the switching of the switching means 36, and an amplifier 38a₁38b₁38c₁Switching means 37b for taking out one of the output signals in synchronization with the switching of the switching means 36, and an amplifier 38a₂38b₂And 38c₂Switching means 37c for taking out one of the output signals in synchronism with the switching of the switching means 36,..., An amplifier 38a_n38b_n38c_nSwitching means 37n for taking out one of the output signals in synchronization with the switching of the switching means 36, an adder 40a for adding the output of the switching means 37a and the output of the switching means 37b, the output of the adder 40a and the switching means An adder 40b for adding the output of 37c, and an adder 40n for adding the output of the previous stage adder and the output of the switching means 37n to the output signal of the digital filter 34.
[0028]
In FIG. 2, reference numeral 23 denotes a transmission element of a transmission system from each vibration generation source position to a vibration suppression target position in the vehicle interior, and reference numeral 24 denotes a transmission system from speakers 3, 6 and 9 to the vibration suppression target position in the vehicle interior. Reference numeral 25 denotes a residual sound detection unit at the vibration suppression target position.
[0029]
For example, as shown in FIG. 3, the travel mode switching controller 35 determines the travel mode and sends a switching signal.
[0030]
That is, when the acceleration a of the vehicle 26 detected by the acceleration detector 32 is 0 and the speed v of the vehicle 26 detected by the speed detector 31 is 0 ≦ v ≦ Xi, the traveling mode switching controller 35. Determines that the driving mode is mode 1, that is, the vibration in the passenger compartment is vibration due to idle noise, and the switching means 36 selects the output signal from the vibration detector 7 during idle operation, that is, the idle noise reference signal, Switching means 37a,.₀Output signal from the amplifier 38a₁Output signal from the amplifier 38a₂Output signal from the amplifier 38a_nThe output signal from is selected. Here, Xi is a predetermined value, and is set in advance to an upper limit value that can be regarded as idle operation.
[0031]
When the acceleration a of the vehicle 26 detected by the acceleration detector 32 is Xa ≦ a and the speed v of the vehicle 26 detected by the speed detector 31 is xi <v, the traveling mode switching controller 35 is It is determined that the driving mode is mode 2, that is, the vibration in the passenger compartment is mainly a vibration caused by a booming sound. 37a, 37b,..., 37n through amplifier 38b₀Output signal from the amplifier 38b₁Output signal from the amplifier 38b₂Output signal from the amplifier 38b_nThe output signal from is selected. Here, Xa is set in advance to a lower limit value at which it is determined that the vibration in the passenger compartment is a loud noise.
[0032]
When the acceleration a of the vehicle 26 detected by the acceleration detector 32 is a ≦ xa and the speed v of the vehicle 26 detected by the speed detector 31 is xi <v, the traveling mode switching controller 35 is It is determined that the driving mode is mode 3, that is, the vehicle interior vibration is mainly due to road noise, and the switching means 36 selects the output signal from the vibration detector 1, that is, the road noise reference signal, and the switching means 37a, 37b, ..., amplifier 38c by 37n₀Output signal from the amplifier 38c₁Output signal from the amplifier 38c₂Output signal from the amplifier 38c_nThe output signal from is selected.
[0033]
According to the active vibration suppressing device according to the embodiment of the present invention configured as described above, based on the vehicle speed detected by the speed detector 31 and the vehicle acceleration detected by the acceleration detector 32, The travel mode is determined by the travel mode switching controller 35, and the switching means 36 and 37a, 37b, 37c,..., 37n are switched in conjunction with each other according to the determined travel mode.
[0034]
As a result, when the traveling mode is determined to be mode 1, the output signal from the vibration detector 7 during idle operation is selected and input to the digital filter 34 as an idle noise reference signal, and the vibration suppression target position in the passenger compartment An amplifier 38a set to a gain for suppressing vibration based on idle noise in₀Output signal from the amplifier 38a₁Output signal from the amplifier 38a₂Output signal from the amplifier 38a_nIs selected, and the speakers 3, 6 and 9 are driven based on the output from the adder 40n, and the vibration at the vibration suppression target position in the vehicle interior based on the idle noise is suppressed.
[0035]
When the travel mode is determined to be mode 2 by the travel mode switching controller 35, the output signal from the vibration detector 7 while the vehicle is traveling is selected and input to the digital filter 34 as a booming sound reference signal, and the vehicle interior vibration is detected. An amplifier 38b set to a gain for suppressing vibration based on the booming noise at the suppression target position.₀Output signal from the amplifier 38b₁Output signal from the amplifier 38b₂Output signal from the amplifier 38b_nIs selected, and the speakers 3, 6 and 9 are driven based on the output from the adder 40n, and the vibration at the vibration suppression target position in the vehicle interior based on the booming noise is suppressed.
[0036]
When the travel mode is determined to be mode 3 by the travel mode switching controller 35, the output signal from the vibration detector 1 is selected and input to the digital filter 34 as a road noise reference signal, and at the vibration suppression target position in the passenger compartment. Amplifier 38c set to a gain for suppressing vibration based on road noise₀Output signal from the amplifier 38c₁Output signal from the amplifier 38c₂Output signal from the amplifier 38c_nIs selected, and the speakers 3, 6 and 9 are driven based on the output from the adder 40n, and the vibration at the vibration suppression target position in the vehicle interior based on the road noise is suppressed.
[0037]
As described above, in the active vibration suppression device according to the embodiment of the present invention, attention is paid to the fact that idle noise, booming noise, and road noise are independent events for the occupant depending on the driving mode. Since the vibration based on the noise limited to the event to be suppressed is suppressed, the control amount of the controller 2 can be reduced and the control speed can be increased, and the controller can be miniaturized and the required volume can be reduced.
[0038]
In the active vibration suppression device according to the embodiment of the present invention described above, when the detection output from the acceleration detector 32 is in a predetermined level range in which the ceiling panel resonates, the detection output from the acceleration detector 32 is obtained. It can also be selected by the switching means 36 as a reference signal.
[0039]
Further, when the vehicle drive system can be switched between four-wheel drive and two-wheel drive, for example, as shown in FIG. 1, vibrations of the vehicle drive system 10 such as a propeller shaft portion and a rear differential gear mount portion are provided. A vibration detector 4 is provided for detecting. In this case, as shown in FIG. 4, the travel mode switching controller 35 is supplied with a switching signal (2WD / 4WD switching signal) between two-wheel drive and four-wheel drive in addition to the above-described configuration, and switched to four-wheel drive. The switching means 361 is configured to be switched to the on state when
[0040]
When the switching means 361 is switched to the on state, the output signal from the vibration detector 4 is synthesized with the booming sound reference signal that is the output signal from the vibration detector 7 while the vehicle is running, and a new booming sound reference is made. Signal and input to the digital filter 34. In this case, the sum of the analog output signal from the vibration detector 7 and the analog output signal from the vibration detector 4 during the traveling of the vehicle is converted into a serial digital signal and used as a new bulk reference signal.
[0041]
Here, the determination of the running mode and the switching of the reference signal based on the output signal from the speed detector 31 and the output signal from the acceleration detector 32 are the same as in the case shown in FIG.
[0042]
Therefore, in the case of two-wheel drive, the same operation as that shown in FIG. 2 is performed, and when switching to four-wheel drive, the output signal from the vibration detector 4 is added to the booming sound reference signal in the case of two-wheel drive. In addition, a new booming sound reference signal is generated, and the vibration at the vibration suppression target position in the vehicle interior based on the new booming sound is suppressed.
[0043]
Further amplifier 38b₀38b₁..., 38b_nThe amplifier 38b can be switched between two stages, and the amplifier 38b is adapted to switch between two-wheel drive and four-wheel drive.₀38b₁..., 38b_nThe degree of amplification may be switched. In this case, vibration suppression is optimally performed corresponding to four-wheel drive / two-wheel drive.
[0044]
Next, a modification of the active vibration suppressing device according to the embodiment of the present invention will be described.
[0045]
A modification of the active vibration suppression device according to the embodiment of the present invention is an example in which an adaptive controller 2A is used instead of the controller 2.
[0046]
FIG. 5 is a block diagram of the controller 2A of the present invention, in which the same components as those of the controller 2 are denoted by the same reference numerals.
[0047]
In the modified example of the active vibration suppression device according to the embodiment of the present invention, as shown in FIG. 1, in addition to the vehicle to which the active vibration suppression device according to the embodiment of the present invention is applied, A microphone 8 is provided in the vicinity of the vibration suppression target position. The microphone 8 is configured to send output as a serial digital signal.
[0048]
The controller 2A includes an adaptive digital filter 34A and a travel mode switching controller 35.
[0049]
The adaptive digital filter 34A includes unit delay elements 39a, ..., 39n, adders 40a, ..., 40n, switching means 36, 37a, ..., 37n, and an amplifier 38a of the digital filter 34.₀..., 38a_n38b₀..., 38b_n38c₀..., 38c_nInstead of amplifier 38a₀..., 38a_n38b₀..., 38b_n38c₀..., 38c_n, And the gain is controlled based on a coefficient correction algorithm which will be described later.₀... 38va_n38vb₀..., 38vb_n, 38vc₀..., 38vc_nAnd a fixed transfer function substantially equal to the transfer function of the secondary sound transfer system 24, and an output signal from the switching means 36, that is, a digital filter 41 that receives a reference signal, and an output signal from the digital filter 41, The output signal from the microphone 8 is input, and the expected value of the square of the output signal from the microphone 8 is minimized.₀... 38va_n38vb₀..., 38vb_n, 38vc₀..., 38vc_nAnd an adaptive control processor 42 for controlling the gain of the adaptive digital filter 34A.
[0050]
In the modified example of the active vibration suppression apparatus according to the embodiment of the present invention including the adaptive digital filter 34A configured as described above, an amplifier 38va₀... 38va_n38vb₀..., 38vb_n, 38vc₀..., 38vc_nThe reference gain as an initial value at the start of operation such as turning on the power of the amplifier 38a₀..., 38a_n38b₀..., 38b_n38c₀..., 38c_nThe gain is set to the same gain as the first gain, and the correction control is performed from the reference gain as the initial value based on the coefficient correction algorithm by the adaptive control processor 42. Thereafter, the gain immediately before the correction control is performed based on the coefficient correction algorithm. Are sequentially controlled.
[0051]
When the travel mode is determined to be mode 1 by the travel mode switching controller 35, the output signal from the vibration detector 7 during idling is selected and input to the adaptive digital filter 34A as an idle noise reference signal, An amplifier 38va set to a reference gain as an initial value for suppressing vibration based on idle noise at the vibration suppression target position.₀Output signal from the amplifier 38va₁Output signal from the amplifier 38va₂Output signal from ..., amplifier 38va_nOutput signal from the adder 40n, the speakers 3, 6 and 9 are driven based on the output from the adder 40n, the output from the digital filter 41 to which the output signal from the vibration detector 7 is input, and the microphone 8 So that the square of the difference from the output of the amplifier 38va is minimized.₀Gain of the amplifier 38va₁Gain of the amplifier 38va₂Gain of the amplifier 38 va_nIs controlled, and vibration at the vibration suppression target position in the vehicle interior based on idle noise is suppressed.
[0052]
When the travel mode is determined to be mode 2 by the travel mode switching controller 35, the output signal from the vibration detector 7 while the vehicle is traveling is selected and input to the adaptive digital filter 34A as a pick-up reference signal, and the vehicle interior vibration is detected. An amplifier 38vb set to a gain for suppressing vibration based on the booming noise at the suppression target position₀Output signal from the amplifier 38vb₁Output signal from the amplifier 38vb₂Output signal from ..., amplifier 38vb_nOutput signal from the adder 40n, the speakers 3, 6 and 9 are driven based on the output from the adder 40n, the output from the digital filter 41 to which the output signal from the vibration detector 4 is input, and the microphone 8 Amplifier 38vb so that the square of the difference from the output of₀Gain of amplifier 38vb₁Gain of amplifier 38vb₂Gain of amplifier 38vb_nIs controlled to suppress the vibration at the vibration suppression target position in the vehicle interior based on the booming noise.
[0053]
When the travel mode is determined to be mode 3 by the travel mode switching controller 35, the output signal from the vibration detector 1 is selected and input to the adaptive digital filter 34A as a road noise reference signal, and the vehicle interior vibration suppression target Amplifier 38vc set to gain to suppress vibration due to road noise at location₀Output signal from the amplifier 38vc₁Output signal from the amplifier 38vc₂Output signal from ..., amplifier 38vc_nOutput signal from the adder 40n, the speakers 3, 6 and 9 are driven based on the output from the adder 40n, the output from the digital filter 41 to which the output signal from the vibration detector 1 is input, and the microphone 8 So that the square of the difference from the output of the amplifier is minimized.₀Gain, amplifier 38vc₁Gain, amplifier 38vc₂Gain of the amplifier 38vc_nIs controlled, and vibration at the vibration suppression target position in the vehicle interior based on road noise is suppressed.
[0054]
As described above, in the modified example of the active vibration suppressing device according to the embodiment of the present invention, attention is paid to the fact that idle noise, booming noise, and road noise are independent events for the occupant in the traveling mode. The vibration based on the noise limited to the event corresponding to the driving mode is suppressed by the adaptive control, and at this time, the reference gain as the initial value at the start of the operation is adaptively controlled from the gain based on the driving mode. In addition to the reduction in the control amount of the controller 2A and the speeding up of the control, the controller 2A can be miniaturized and the required volume can be reduced.
[0055]
【The invention's effect】
As described above, according to the active vibration suppression device of the present invention, the vehicle driving mode is determined, and the event corresponding to the driving mode is switched by switching the event for performing the noise suppression control based on the determined driving mode. Since the vehicle interior noise suppression control can be performed and the above-described problems can be solved and the control system can be gathered into one, the cost, weight, and necessary space can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view of a vehicle in which an active vibration suppression device according to an embodiment of the present invention is installed.
FIG. 2 is a block diagram of an active vibration suppression device according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of traveling mode discrimination by a traveling mode switching controller in the active vibration suppressing device according to the embodiment of the present invention.
FIG. 4 is a block diagram of a modified example of the active vibration suppression device according to the embodiment of the present invention, showing a case where there is switching between four-wheel drive / two-wheel drive.
FIG. 5 is a block diagram of a modification of the active vibration suppressing device according to the embodiment of the present invention.
FIG. 6 is a schematic diagram of a vehicle in which a conventional active vibration suppression device is installed.
FIG. 7 is a block diagram of a conventional active vibration suppression device.
[Explanation of symbols]
1, 4, 7 Vibration detector for road noise, booming noise and idle noise
2, 2A controller
3, 6, 9 Speaker
8 Microphone
10 Vehicle drive system
26 Vehicle
31 Speed detector
32 Acceleration detector
34, 41 Digital filter
34A Digital filter
35 Driving mode switching controller
36, 37a, ..., 37n switching means
38a₀..., 38a_n38b₀..., 38b_n38c₀..., 38c_n38va₀... 38va_n38vb₀..., 38vb_n, 38vc₀..., 38vc_n  amplifier
39a, ..., 39n Unit delay element
40a, ..., 40n Adder

Claims (4)

An acceleration detector that is provided on the ceiling of the passenger compartment and detects the resonance of the passenger compartment ceiling along with the acceleration of the vehicle, and a drive system vibration detector that detects vibrations of the vehicle drive system. Vibration detecting means for detecting each separately;
An output signal from each of the vibration detection means is input as a reference signal, and a canceling signal having a vibration transmission characteristic having an opposite phase to each vibration transmission characteristic from each vibration source to the vehicle interior corresponds to the input reference signal. Vibration suppression signal generating means having a coefficient multiplier in which a coefficient corresponding to each reference signal is set as a multiplication coefficient,
The vehicle traveling state is determined, and an output signal from the vibration detecting means selected based on the determined traveling state is sent as a reference signal to the vibration suppression signal generating unit, and the coefficient multiplier is set to the determined traveling state. A traveling state determination means for switching to a coefficient multiplier of a multiplication coefficient based on
A canceling vibration generator provided in the passenger compartment and driven by a canceling signal output from the vibration suppression signal generating means ;
Equipped with a,
When it is determined from the output signal of the acceleration detector that the traveling state determination means is an acceleration within a predetermined range in which the vehicle compartment ceiling resonates, the driving state determination unit selects the output signal from the acceleration detector as a reference signal, and If it is determined that the four-wheel drive is switched based on the switching of the drive system, the output signal from the drive system vibration detector is added to form a new reference signal,
An active vibration suppression device characterized by the above. Vibration detection means for detecting vibration from each vibration source of the vehicle separately;
An output signal from each of the vibration detection means is input as a reference signal, and a canceling signal having a vibration transmission characteristic having an opposite phase to each vibration transmission characteristic from each vibration source to the vehicle interior corresponds to the input reference signal. Vibration suppression signal generating means having a coefficient multiplier in which a coefficient corresponding to each reference signal is set as a multiplication coefficient,
The vehicle traveling state is determined, and an output signal from the vibration detecting means selected based on the determined traveling state is sent as a reference signal to the vibration suppression signal generating unit, and the coefficient multiplier is set to the determined traveling state. A traveling state determination means for switching to a coefficient multiplier of a multiplication coefficient based on
A canceling vibration generator provided in the passenger compartment and driven by a canceling signal output from the vibration suppression signal generating means;
With
When it is determined that the travel state has changed based on the travel state determined by the travel state determination means, the coefficient multiplier is used to determine the change in the coefficient multiplier using an initial value determined in advance according to the new travel state determined to have changed. Performing a coefficient update operation,
An active vibration suppression device characterized by the above. 3. The active vibration suppressing device according to claim 1, wherein the traveling state determining means determines a traveling state based on a traveling speed of the vehicle. 3. The active vibration suppression device according to claim 1, wherein the traveling state determination means is based on vibration from the tire when the traveling speed of the vehicle is not less than a predetermined value and the acceleration of the vehicle is not more than a predetermined acceleration. An active vibration suppression device that determines that the vehicle is in a running state using an output signal from a vibration detection means for detecting vibration as a reference signal.

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