JP2011148332A - Active type vibration noise control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active type vibration noise control system capable of automatically deciding an abnormality of silencing performance of an active type vibration noise control device for reducing vibration noise generated in a vehicle. <P>SOLUTION: A fault diagnostic device 50 of this active type vibration noise control system 12 decides the abnormality of the silencing performance of the first active type vibration noise control device 66 by outputting reference sound RS for evaluating the silencing performance of the first active type vibration noise control device 66 by a second output part 32 and canceling the reference sound RS by first vibration sound based on first canceling sound CS or first canceling vibration by operating the first active type vibration noise control device 66. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an active vibration noise control system for diagnosing a failure of an active vibration noise control device, and more particularly, to determine an abnormality in the silencing performance of an active vibration noise control device that reduces vibration noise generated in a vehicle. The present invention relates to an active vibration noise control system.

  2. Description of the Related Art An active noise control apparatus (hereinafter referred to as “ANC apparatus”) is known as an apparatus for controlling sound in relation to vibration noise in a passenger compartment. In a general ANC device, the vibration noise is reduced by outputting a cancellation sound having an opposite phase to the vibration noise from a speaker in the vehicle interior. Further, the error between the vibration noise and the canceling sound is detected as a residual noise by a microphone disposed in the vicinity of the occupant's ear position, and is used for determining the subsequent canceling sound. Examples of the ANC device include a device that reduces noise generated in the vehicle interior (engine noise) in response to engine operation (vibration), and a noise generated in the vehicle interior due to contact between the wheels and the road surface while the vehicle is running (road There are some which reduce (noise) (for example, refer to patent documents 1 and 2).

  In addition, a method for diagnosing a failure of an ANC device has been proposed (see, for example, Patent Document 3). In Patent Document 3, an operator determines whether or not there is a failure in the ANC device by comparing the degree of mute between normal operation and operation stop of the ANC device (see paragraphs [0055] to [0058] of the same document). .

  In addition to the ANC apparatus, an active vibration control apparatus (hereinafter referred to as “AVC apparatus”) is known as an apparatus for controlling sound in relation to vibration noise in the passenger compartment. (Patent Document 1). In a general AVC apparatus, the vibration is reduced by outputting an anti-phase cancellation vibration from the actuator. Further, the error between the vibration and the canceling vibration is detected as a residual vibration by a vibration sensor arranged at the vibration canceling target position, and is used for determining the subsequent canceling vibration. Thereby, as a result, the vibration noise in a vehicle interior can be reduced. Based on the above, hereinafter, the term “active vibration noise control device” is used to include both ANC devices and AVC devices, and the term “active vibration noise control system” refers to ANC devices and It is used to mean a system including at least one of AVC devices.

JP 2004-361721 A JP 05-265471 A Japanese Patent No. 4309919

  As described above, Patent Document 3 performs failure diagnosis of the ANC device, but does not show a configuration for automatically determining an abnormality in the silencing performance of the ANC device.

  The present invention has been made in consideration of such problems, and is an active type capable of automatically determining an abnormality in the silencing performance of an active vibration noise control device that reduces vibration noise generated in a vehicle. An object is to provide a vibration noise control system.

  The active vibration noise control system according to the present invention is a first control that represents a first canceling vibration that reduces the vibration noise by canceling a first canceling sound that cancels the vibration noise generated in the vehicle or a vibration generated in the vehicle. A first active type vibration noise control device comprising: a first control signal generation unit that generates a signal; and a first output unit that outputs the first cancellation noise or the first cancellation vibration based on the first control signal; A second control signal generating unit that generates a second control signal that represents a second canceling sound that cancels the vibration noise or a second canceling vibration that reduces the vibration noise by canceling the vibration, and the second control signal And a second active vibration noise control device having a second output section for outputting the second cancellation noise or the second cancellation vibration, and a failure diagnosis device for performing a failure diagnosis of the first active vibration noise control device. The failure diagnosis device outputs a reference sound for evaluating the muffling performance of the first active vibration noise control device by the second output unit, and operates the first active vibration noise control device. The abnormality of the silencing performance of the first active vibration noise control device is determined by canceling the reference sound by the first vibration noise based on the first cancellation noise or the first vibration noise based on the first cancellation vibration. To do.

  According to the present invention, in the active vibration noise control system, the reference sound is output from the second active vibration noise control device, and the reference sound is output from the first active vibration noise control device as the first canceling sound or the first sound. The failure diagnosis apparatus determines an abnormality in the silencing performance of the first active vibration noise control apparatus by canceling with the first vibration sound based on the canceling vibration. Accordingly, it is possible to automatically determine the abnormality of the silencing performance without involving the operator.

  Further, if the reference sound from the second active vibration noise control device is set as pseudo vibration noise, the first driving state is reproduced without driving the vehicle or starting the engine. It becomes possible to diagnose a failure of the active vibration noise control device.

  The first active vibration noise control device may generate the first canceling sound or the first canceling vibration based on a reference sound signal that represents the reference sound and is input to the second output unit.

  The first active vibration noise control device further detects a difference between the reference sound and the first canceling sound or the first vibration sound, and outputs a first error signal indicating the error. The failure diagnosis device includes an amplitude of the first error signal, the reference sound, and the first sound when the reference sound is output and the first canceling sound or the first vibration sound is not output. The occurrence of a fault in the first active vibration noise control device or the first error detection unit is detected by comparing the amplitude of the first error signal when the canceling sound or the first vibration sound is output. May be.

  The reference sound signal may be a plurality of sine wave signals having different fixed frequencies. Thereby, the reference sound is output at a plurality of different fixed frequencies, and the silencing performance of the first active vibration noise control device can be evaluated for each control frequency.

  The first control signal generation unit is a speaker that generates a first control signal representing the first canceling sound, and the first output unit is a speaker that outputs the first canceling sound based on the first control signal. The second control signal generation unit generates a second control signal representing the second cancellation vibration, and the second output unit outputs the second cancellation vibration based on the second control signal. It may be.

  The vibration actuator can be installed, for example, on any of the subframe, body panel, tailgate, or trunk of the vehicle. In general, the sub-frame, the body panel, the tailgate, and the trunk are not provided with anti-vibration rubber, and it is easy to output vibration sound by the vibration actuator. Therefore, it is possible to output the reference sound suitably.

  The failure diagnosis device includes a temperature range for determining whether or not the silencing performance abnormality can be determined, and a threshold value for the engine speed or the motor speed of the vehicle for determining whether or not the silencing performance abnormality can be determined. When setting at least one of a certain rotation speed threshold value and an error threshold value that is a threshold value of the error for determining whether or not to determine abnormality of the silencing performance, and the ambient temperature of the vehicle is outside the temperature range, When the engine rotational speed or the motor rotational speed exceeds the rotational speed threshold value, or when the error exceeds the error threshold value, the determination of abnormality in the silencing performance may not be performed. As a result, failure diagnosis can be performed only under conditions suitable for failure diagnosis of the first active vibration and noise control device, and if conditions are not suitable for failure diagnosis, it is possible to ask the operator to improve the conditions. Become.

  The first active vibration noise control device further detects a first error which is an error between the vibration noise and the first canceling sound or an error between the vibration and the first canceling vibration. The second active vibration noise control device further includes an error between the vibration noise and the second canceling sound or the vibration and the second canceling signal. You may provide the 2nd error detection part which detects the 2nd error which is an error with a vibration, and outputs the 2nd error signal which shows the said 2nd error.

  The first control signal generator generates a first reference signal generator that generates a first reference signal based on the vibration noise or the vibration, and generates the first control signal based on the first reference signal. A first adaptive filter; a first reference signal correction unit that corrects the first reference signal based on a transfer characteristic from the first output unit to the first error detection unit and outputs a first correction reference signal; A first filter coefficient updating unit that sequentially updates filter coefficients of the first adaptive filter so that the first error signal is minimized based on the first error signal and the first correction reference signal; Good.

  Further, the second control signal generation unit generates a second reference signal generation unit that generates the second reference signal based on the vibration noise or the vibration, and generates the second control signal based on the second reference signal. A second reference signal correcting unit that corrects the second reference signal based on a transfer characteristic from the second output unit to the second error detection unit and outputs a second corrected reference signal; A second filter coefficient updating unit that sequentially updates filter coefficients of the second adaptive filter so that the second error signal is minimized based on the two error signals and the second corrected reference signal may be provided.

  According to the present invention, in the active vibration noise control system, the reference sound is output from the second active vibration noise control device, and the reference sound is output from the first active vibration noise control device as the first canceling sound or the first sound. The failure diagnosis apparatus determines an abnormality in the silencing performance of the first active vibration noise control apparatus by canceling with the first vibration sound based on the canceling vibration. Accordingly, it is possible to automatically determine the abnormality of the silencing performance without involving the operator.

  Further, if the reference sound from the second active vibration noise control device is set as pseudo vibration noise, the first driving state is reproduced without driving the vehicle or starting the engine. It becomes possible to diagnose a failure of the active vibration noise control device.

1 is a schematic configuration diagram of a vehicle equipped with an active vibration noise control system according to an embodiment of the present invention. It is a flowchart which performs a failure diagnosis in the said active vibration noise control system. 3 is a first flowchart showing details of failure diagnosis processing in FIG. 2. It is a 2nd flowchart which shows the detail of the failure diagnosis process in FIG. It is a figure which shows the relationship between a counter value and the frequency of a reference sound. It is a figure which shows a mode that only a reference sound is output in the case of the said failure diagnosis process. It is a figure which shows a mode that both a reference sound and a cancellation sound are output in the case of the said failure diagnosis process. It is a figure which shows an example of the data acquired in the said failure diagnosis process. It is a figure which shows a mode that only the cancellation sound as a 2nd reference sound is output in the case of the said failure diagnosis process. It is a figure which shows another example of the data acquired in the said failure diagnosis process.

[A. One Embodiment]
1. Overall and Configuration of Each Part (1) Overall Configuration FIG. 1 is a schematic configuration of a vehicle 10 equipped with an active vibration noise control system 12 (hereinafter also referred to as “control system 12”) according to an embodiment of the present invention. FIG. The vehicle 10 is a gasoline vehicle, but may be a vehicle such as an electric vehicle, a hybrid vehicle, or a fuel cell vehicle.

  In addition to the control system 12, the vehicle 10 includes an engine 14, a fuel injection control device 16 that controls fuel injection into the engine 14 (hereinafter referred to as “FI-ECU 16”), and an ambient temperature of the vehicle 10 (ambient temperature Tc). And a temperature sensor 20 that detects [° C.] and outputs an ambient temperature signal St indicating the ambient temperature Tc. The FI-ECU 16 outputs to the control system 12 an engine pulse Ep and an engine speed signal Sne indicating the speed of the engine 14 (engine speed Ne) [rpm].

(2) Control system 12
The control system 12 includes a noise / vibration control device 22 (hereinafter referred to as “noise / vibration ECU 22” or “ECU 22”), a first amplifier 24, a speaker 26, a microphone 28, a second amplifier 30, and a vibration actuator. 32 and a vibration sensor 34. Among these, active noise control (ANC) can be executed by the ECU 22, the first amplifier 24, the speaker 26 and the microphone 28, and active vibration control (AVC) is performed by the ECU 22, the second amplifier 30, the vibration actuator 32 and the vibration sensor 34. ) Can be executed.

  The ANC is a control for canceling the vibration noise NZ at the muffle target position (the microphone 28 in the present embodiment) by generating a sound having a phase opposite to that of the vibration noise NZ generated in the vehicle 10 (cancellation sound CS). The vibration noise NZ mentioned here includes engine noise and road noise. The vibration noise NZ to be canceled by the ANC in this embodiment is engine noise due to the engine 14.

  The ECU 22 may have a road noise muffling function in addition to the engine muffler noise muffling function. That is, it is also possible to have a configuration for road noise (for example, Patent Document 2) prior to the ECU 22.

  The AVC generates a vibration having a phase opposite to the vibration VN generated in the vehicle 10 (cancellation vibration CV), thereby canceling the vibration VN at the vibration suppression target position (a specific position in the subframe 36 in the present embodiment). It is. The vibration VN mentioned here includes a vibration caused by the operation of the engine 14 and a road surface input. The vibration VN to be canceled by the AVC in this embodiment is a vibration caused by the operation of the engine 14. In addition, since the vibration noise NZ can be canceled by canceling the vibration VN by the AVC, in this specification, the AVC is treated as a kind of ANC, and the vibration damping performance by the AVC is a kind of sound deadening performance by the ANC. handle. Moreover, as a structure which performs AVC, the thing (FIG. 18) described in Unexamined-Japanese-Patent No. 2007-269286 can be used, for example.

  The ECU 22 calculates a canceling sound CS for canceling the vibration noise NZ generated in the vehicle 10 and a canceling vibration CV for canceling the vibration VN, and a first control signal Sc1 representing the canceling sound CS and a first canceling vibration CV representing the canceling vibration CV. 2 The control signal Sc2 is output.

  The first amplifier 24 amplifies the first control signal Sc1 from the ECU 22 and outputs the amplified signal to the speaker 26.

  The speaker 26 outputs a canceling sound CS to the microphone 28 based on the first control signal Sc1 amplified by the first amplifier 24. Thereby, the silencing effect of the vibration noise NZ is obtained. The speaker 26 is disposed, for example, in the door inner wall on the front seat side. Alternatively, it can be provided behind the rear seat.

  The microphone 28 detects residual noise as an error (first error) between the vibration noise NZ and the canceling sound CS, and outputs a first error signal e1 corresponding to the residual noise to the ECU 22. The microphone 28 can be disposed, for example, above the driver's seat (over the passenger's head).

  The second amplifier 30 amplifies the second control signal Sc2 from the ECU 22 and outputs it to the vibration actuator 32.

  The vibration actuator 32 generates a cancellation vibration CV based on the second control signal Sc2 amplified by the second amplifier 30. The vibration actuator 32 of this embodiment is disposed so as to contact the subframe 36.

  The vibration sensor 34 detects a residual vibration as an error (second error) between the vibration VN and the cancellation vibration CV, and outputs a second error signal e2 corresponding to the residual vibration to the ECU 22.

(3) Details of Noise / Vibration ECU 22 The ECU 22 includes a microcomputer, a volatile memory, a nonvolatile memory, and the like (not shown). The microcomputer executes functions such as a function for determining the cancellation sound CS (a cancellation sound determination function) and a function for determining the cancellation vibration CV (a cancellation vibration determination function) by a program stored in the non-volatile memory.

  As shown in FIG. 1, the ECU 22 includes a frequency detection unit 40, a reference signal generation unit 42, a standard table 44, a first control signal generation unit 46, a second control signal generation unit 48, and a failure diagnosis unit 50. And a first switch 52 and a second switch 54. In FIG. 1, each component of the ECU 22 is illustrated in a simplified manner. In practice, there are also a plurality of components provided because the reference signal Sb is generated by being divided into a cosine wave and a sine wave. (For example, refer to Patent Document 1).

  The frequency detector 40 detects the engine rotation frequency f [Hz] based on the engine pulse Ep from the FI-ECU 16, and outputs a rotation frequency signal Sf indicating the engine rotation frequency f. The engine speed Ne multiplied by 60 is the engine speed Ne. Hereinafter, the engine speed f and the engine speed Ne may be used interchangeably.

  The reference signal generator 42 generates the reference signal Sb by acquiring data from the reference table 44 based on the rotation frequency signal Sf. Note that the reference signal Sb is divided into a cosine wave and a sine wave, but they are collectively shown in FIG.

  The first control signal generator 46 generates the first control signal Sc1 based on the reference signal Sb from the reference signal generator 42 and the first error signal e1 from the microphone 28. As illustrated in FIG. 1, the first control signal generation unit 46 includes a first adaptive filter 60, a first reference signal correction unit 62, and a first filter coefficient update unit 64.

  The first adaptive filter 60 performs an adaptive filter process using the first filter coefficient W1 on the reference signal Sb, and outputs a first control signal Sc1 representing a canceling sound CS for reducing the vibration noise NZ. As the first adaptive filter 60, an adaptive notch filter or an FIR (Finite impulse response) type filter can be used.

  The first reference signal correction unit 62 generates a first correction reference signal Sr1 by performing transfer function processing on the reference signal Sb from the reference signal generation unit 42. The first correction reference signal Sr1 is used when the first filter coefficient updating unit 64 calculates the first filter coefficient W1. The transfer function process is a process of correcting the reference signal Sb based on the transfer function C ^ 1 (filter coefficient) of the canceling sound CS from the speaker 26 to the microphone 28. The transfer function C ^ 1 used in this transfer function process is a measured value or predicted value of the actual transfer function C1 of the cancellation sound CS from the speaker 26 to the microphone 28.

The first filter coefficient update unit 64 sequentially calculates and updates the first filter coefficient W1. The first filter coefficient updating unit 64 calculates the first filter coefficient W1 using an adaptive algorithm calculation {for example, a least squares (LMS) algorithm calculation}. That is, based on the first error signal e1 from the first correction reference signal Sr1 and the microphone 28 from the first reference signal correcting unit 62, the first filter coefficient of the square e1 ² of the first error signal e1 to zero W1 is calculated.

  In addition, the structure which produces | generates the cancellation sound CS based on the reference signal Sb, ie, the frequency detection part 40, the reference signal production | generation part 42, the reference | standard table 44, the 1st control signal production | generation part 46, the 1st amplifier 24, the speaker 26, and a microphone A configuration including 28 is referred to as an active noise control system 66 or an ANC system 66.

  The second control signal generator 48 generates the second control signal Sc2 based on the reference signal Sb from the reference signal generator 42 and the second error signal e2 from the vibration sensor 34. As shown in FIG. 1, the second control signal generation unit 48 includes a second adaptive filter 70, a second reference signal correction unit 72, and a second filter coefficient update unit 74.

  The second adaptive filter 70 performs an adaptive filter process using the second filter coefficient W2 on the reference signal Sb, and outputs a second control signal Sc2 representing a canceling vibration CV for reducing the vibration VN. As the second adaptive filter 70, an adaptive notch filter or an FIR type filter can be used.

  The second reference signal correction unit 72 generates a second correction reference signal Sr2 by performing transfer function processing on the reference signal Sb from the reference signal generation unit 42. The second correction reference signal Sr2 is used when the second filter coefficient updating unit 74 calculates the second filter coefficient W2. The transfer function process is a process of correcting the reference signal Sb based on the transfer function C ^ 2 (filter coefficient) of the canceling vibration CV from the vibration actuator 32 to the vibration canceling target position of the subframe 36. The transfer function C ^ 2 used in this transfer function process is a measured value or predicted value of the actual transfer function C2 of the canceling vibration CV from the vibration actuator 32 to the vibration canceling target position of the subframe 36.

The second filter coefficient update unit 74 sequentially calculates and updates the second filter coefficient W2. The second filter coefficient update unit 74 calculates the second filter coefficient W2 using an adaptive algorithm calculation {for example, a least square method (LMS) algorithm calculation}. That is, based on the second correction reference signal Sr2 from the second reference signal correction unit 72 and the second error signal e2 from the vibration sensor 34, the second filter is set so that the square e2 ² of the second error signal e2 is zero. The coefficient W2 is calculated.

  The configuration for generating the cancellation vibration CV based on the reference signal Sb, that is, the frequency detection unit 40, the reference signal generation unit 42, the standard table 44, the second control signal generation unit 48, the second amplifier 30, the vibration actuator 32, and A configuration including the vibration sensor 34 is referred to as an active vibration control system 76 or an AVC system 76.

  The failure diagnosis unit 50 performs failure diagnosis of the ANC system 66 using the AVC system 76 (particularly, the vibration actuator 32). That is, the failure diagnosis unit 50 outputs the third control signal Sc3 to the vibration actuator 32 via the second amplifier 30 while the engine 14 is stopped, and vibrates the subframe 36 by the vibration actuator 32. Thus, the reference sound RS which is simulated vibration noise (simulated vibration noise) is generated. Then, the silencing performance of the ANC system 66 is determined by canceling the reference sound RS with the silencing sound CS generated by the ANC system 66 (specific processing will be described later).

  The first switch 52 connects the frequency detection unit 40 and the reference signal generation unit 42 during normal operation (when the failure diagnosis unit 50 is not performing failure diagnosis), and the failure diagnosis unit 50 performs failure diagnosis. In this case, the failure diagnosis unit 50 and the reference signal generation unit 42 are connected. Note that the operation of the first switch 52 is controlled by the failure diagnosis unit 50.

  The second switch 54 connects the reference signal generation unit 42 and the second control signal generation unit 48 during normal operation (when the failure diagnosis unit 50 is not performing failure diagnosis), and the failure diagnosis unit 50 performs failure diagnosis. When performing, the reference signal generation unit 42 and the second control signal generation unit 48 are separated. Note that the operation of the second switch 54 is controlled by the failure diagnosis unit 50.

2. Control of each part (1) Generation of cancellation sound CS (normal time)
The generation of the canceling sound CS at normal time (when failure diagnosis by the failure diagnosis unit 50 is not performed) will be described. The frequency detection unit 40 detects the engine rotation frequency f based on the engine pulse Ep from the FI-ECU 16, and outputs a rotation frequency signal Sf indicating the engine rotation frequency f.

  Next, in the reference signal generation unit 42, the reference signal Sb is generated by acquiring data from the reference table 44 based on the rotation frequency signal Sf from the frequency detection unit 40, and is output to the first control signal generation unit 46. The As described above, the reference signal Sb here is generated separately as a sine wave and a cosine wave.

  The first control signal generator 46 generates a first control signal Sc 1 based on the reference signal Sb from the reference signal generator 42 and the first error signal e 1 from the microphone 28, and the speaker via the first amplifier 24. 26.

  The speaker 26 outputs a cancellation sound CS based on the first control signal Sc1. Then, in the microphone 28, an error between the vibration noise NZ and the canceling sound CS is detected as residual noise, and a first error signal e1 corresponding to this error is output to the first control signal generator 46. The first error signal e1 is used for subsequent processing in the first control signal generator 46.

(2) Generation of cancellation vibration CV (normal time)
The generation of the canceling vibration CV at normal time (when failure diagnosis by the failure diagnosis unit 50 is not performed) will be described. The process until the reference signal Sb is generated based on the engine pulse Ep from the FI-ECU 16 is the same as the generation of the canceling sound CS.

  Next, the second control signal generation unit 48 generates the second control signal Sc2 based on the reference signal Sb from the reference signal generation unit 42 and the second error signal e2 from the vibration sensor 34, and passes through the second amplifier 30. Is output to the vibration actuator 32.

  In the vibration actuator 32, a cancellation vibration CV is generated based on the second control signal Sc2. Then, the vibration sensor 34 detects an error between the vibration VN and the cancellation vibration CV as a residual vibration, and a second error signal e2 corresponding to this error is output to the second control signal generator 48. The second error signal e2 is used for subsequent processing in the second control signal generator 48.

  During normal operation, the ANC system 66 and the AVC system 76 can be operated in parallel.

(3) Failure diagnosis of ANC system 66 Next, failure diagnosis of the ANC system 66 will be described. In the present embodiment, the failure diagnosis is performed at the time of factory shipment or at the time of inspection at a dealer, and is started when an operator performs a predetermined operation. Examples of the predetermined operation include a predetermined operation performed on a specific key on the console by connecting a console to the ECU 22 from the outside of the vehicle 10.

  FIG. 2 shows a flowchart for performing failure diagnosis of the ANC system 66. In step S1, the failure diagnosis unit 50 of the ECU 22 receives a failure diagnosis start command from the outside of the vehicle 10 by the method described above.

  In step S2, the failure diagnosis unit 50 determines whether or not the ambient temperature Tc of the vehicle 10 is suitable for performing failure diagnosis. Specifically, the failure diagnosis unit 50 determines whether or not the ambient temperature Tc detected by the temperature sensor 20 is higher than the lower limit threshold TH_t_l [° C.] and lower than the upper limit threshold TH_t_h [° C.]. The lower limit threshold TH_t_l is a lower limit value (for example, −10 ° C.) of a temperature suitable for performing failure diagnosis. The upper limit threshold TH_t_h is an upper limit value (for example, 40 ° C.) of temperature suitable for performing failure diagnosis.

  If the ambient temperature Tc is not suitable for performing a failure diagnosis (S2: NO), in step S3, the failure diagnosis unit 50 outputs an error message to a monitor (not shown). If the ambient temperature Tc is suitable for failure diagnosis (S2: YES), the process proceeds to step S4.

  In step S4, the failure diagnosis unit 50 determines whether or not the engine 14 is stopped. Specifically, failure diagnosis unit 50 determines whether or not engine speed Ne notified from FI-ECU 16 is less than speed threshold value TH_e [rpm]. The rotation speed threshold TH_e is a threshold (for example, 400 rpm) for determining stop of the engine 14.

  If the engine 14 is not stopped (S4: NO), the failure diagnosis unit 50 outputs an error message to a monitor (not shown) in step S3. If the engine 14 is stopped (S4: YES), the process proceeds to step S5.

  In step S5, the failure diagnosis unit 50 determines whether the interior of the vehicle 10 is quiet. Specifically, the failure diagnosis unit 50 determines whether the amplitude (amplitude Ap) of the first error signal e1 from the microphone 28 in a state where the speaker 26 and the vibration actuator 32 are not operated is less than the silence determination threshold value TH_p. Determine if. Here, the amplitude Ap indicates the output from the microphone 28 divided into, for example, 32 bits. The quietness determination threshold TH_p is a threshold for determining whether or not the periphery of the microphone 28 is quiet.

  If the interior of the vehicle 10 is not quiet (S5: NO), in step S3, the failure diagnosis unit 50 outputs an error message to a monitor (not shown). When the inside of the vehicle 10 is quiet (S5: YES), in step S6, the failure diagnosis unit 50 executes failure diagnosis processing.

  FIG. 3 is a first flowchart showing details of the failure diagnosis processing, and FIG. 4 is a second flowchart (showing a continuation of FIG. 3) showing details of the failure diagnosis processing. In step S11, the failure diagnosis unit 50 selects the frequency F [Hz] of the reference sound RS. The reference sound RS is a sound (pseudo vibration noise) output from the AVC system 76 in order to diagnose a failure of the ANC system 66. Specifically, by operating the vibration actuator 32 based on the third control signal Sc3 from the failure diagnosis unit 50, the subframe 36 is vibrated, and the reference sound RS is generated by the vibration of the subframe 36.

In the present embodiment, a plurality of frequencies F of the reference sound RS are set, and the reference sounds RS having different frequencies F are output in order. That is, as shown in FIG. 5, the failure diagnosis unit 50 sets a counter value i for defining the frequency F and a frequency F corresponding to the counter value i. For example, when the counter value i is 1, the frequency F is 30 Hz. When the counter value i is 2, the frequency F is 50 Hz. When the counter value i is 3, the frequency F is 80 Hz. Is N (N is the maximum value of the counter value i), the frequency F is F _n .

  Returning to FIG. 3, in step S12, the failure diagnosis unit 50 starts outputting the reference sound RS having the frequency F selected in step S11. In subsequent step S13, the failure diagnosis unit 50 acquires the amplitude (amplitude Am1) of the first error signal e1 from the microphone 28 in a state where only the reference sound RS is output. When outputting the reference sound RS, the failure diagnosis unit 50 outputs the third control signal Sc3 as a sine wave of the frequency F to the vibration actuator 32. Further, the failure diagnosis unit 50 connects the failure diagnosis unit 50 and the reference signal generation unit 42 by the first switch 52, and disconnects the reference signal generation unit 42 and the second control signal generation unit 48 by the second switch 54. Make it. However, no signal is output from the failure diagnosis unit 50 to the reference signal generation unit 42. Therefore, at this time, the canceling sound CS from the ANC system 66 is not output (see FIG. 6).

  In step S14, the failure diagnosis unit 50 determines whether the output of the microphone 28 is normal. Specifically, the failure diagnosis unit 50 determines whether or not the amplitude Am1 of the first error signal e1 when the reference sound RS is output exceeds the threshold value TH_am1. The threshold value TH_am1 is a threshold value for determining whether or not the output of the microphone 28 (first error signal e1) corresponds to the volume of the reference sound RS. For example, an experimental value or a simulation value may be used. it can.

  When the output of the microphone 28 is normal (S14: YES), in step S15, the failure diagnosis unit 50 starts outputting the cancellation sound CS. At this time, the reference sound RS from the AVC system 76 is also continuously output (see FIG. 7). Therefore, the residual noise after the cancellation sound CS cancels the reference sound RS is input to the microphone 28.

  In order to output both the reference sound RS and the canceling sound CS, the failure diagnosis unit 50 connects the failure diagnosis unit 50 and the reference signal generation unit 42 by the first switch 52, and the reference signal generation unit 42 by the second switch 54. And the second control signal generator 48 are separated. The failure diagnosis unit 50 outputs the third control signal Sc3 having the same frequency F to both the second amplifier 30 and the reference signal generation unit 42. Accordingly, the vibration actuator 32 vibrates based on the third control signal Sc3 amplified by the second amplifier 30, and the reference sound RS is output from the subframe 36. Further, the reference signal generation unit 42 generates a reference signal Sb having the same frequency F as the reference sound RS, and the ANC system 66 generates a canceling sound CS using adaptive control.

  In step S16, the failure diagnosis unit 50 acquires the amplitude (amplitude Am2) of the first error signal e1 when both the reference sound RS and the cancellation sound CS are output. In subsequent step S17, the failure diagnosis unit 50 stops the output of the reference sound RS and the cancellation sound CS. That is, the output of the third control signal Sc3 to the second amplifier 30 and the reference signal generator 42 is stopped.

  In step S18, the failure diagnosis unit 50 determines whether or not the silencing performance of the ANC system 66 is normal. Specifically, in this embodiment, the amplitude Am2 of the first error signal e1 when both the reference sound RS and the cancellation sound CS are output is the first error when only the reference sound RS is output. It is determined whether it is smaller than half of the amplitude Am1 of the signal e1. This determination method can be changed as appropriate.

  When the silencing performance of the ANC system 66 is normal (S18: YES), in step S19, the failure diagnosis unit 50 determines that the data related to the diagnosis result for the current frequency F (the silencing performance of the ANC system 66 is normal). Stored in a non-volatile memory or a volatile memory (not shown).

  In subsequent step S20, failure diagnosis unit 50 determines whether or not failure diagnosis has been completed. Specifically, it is determined whether or not the counter value i is equal to the maximum value N. If the failure diagnosis is not completed (S20: NO), the counter value i is incremented by 1 in step S21, and the process returns to step S11. When the failure diagnosis is completed (S20: YES), the process returns to the flowchart of FIG.

  Returning to step S18, if the silencing performance of the ANC system 66 is not normal (S18: NO), in step S22, the failure diagnosis unit 50 determines the data related to the diagnosis result for the current frequency F (the silencing performance of the ANC system 66 is abnormal). 2) is stored in a non-volatile memory or volatile memory (not shown), and the process returns to the flowchart of FIG.

  FIG. 8 shows an example of data stored in step S22. In the example of FIG. 8, when the frequency F is 30 Hz, 50 Hz, and 80 Hz, the ANC system 66 is operating normally, that is, the amplitude Am2 is smaller than half of the amplitude Am1. On the other hand, when the frequency F is 150 Hz, the ANC system 66 is not operating normally, that is, the amplitude Am2 is not smaller than half of the amplitude Am1.

  Returning to step S14 of FIG. 3, if the output of the microphone 28 is not normal (S14: NO), the cause is a malfunction of the failure diagnosis unit 50 of the ECU 22, a disconnection between the ECU 22 and the vibration actuator 32, the second A malfunction of the amplifier 30, a malfunction of the vibration actuator 32, a malfunction of the microphone 28, or a disconnection from the microphone 28 to the ECU 22 can be considered.

  Therefore, first, in step S23 of FIG. 4, the failure diagnosis unit 50 stops the output of the reference sound RS by stopping the output of the third control signal Sc3 to the second amplifier 30. Further, in step S24, the failure diagnosis unit 50 activates the ANC system 66 to start outputting the canceling sound CS (see FIG. 9). However, the canceling sound CS here is not intended to cancel the reference sound RS, but is a sound (second reference sound RS2) for specifying a failure site.

  When outputting the canceling sound CS, the failure diagnosis unit 50 separates the frequency detection unit 40, the failure diagnosis unit 50, and the reference signal generation unit 42 from each other by the first switch 52, and the reference signal generation unit 42 and the first signal generation unit 42 by the second switch 54. 2 The control signal generator 48 is disconnected. Then, the failure diagnosis unit 50 outputs the fourth control signal Sc4 to the first amplifier 24. Accordingly, the fourth control signal Sc4 is output to the speaker 26 via the first amplifier 24, and the canceling sound CS (second reference sound RS2) corresponding to the fourth control signal Sc4 is output from the speaker 26. The canceling sound CS is detected by the microphone 28, and a first error signal e1 corresponding to the canceling sound CS is output from the microphone 28 to the failure diagnosis unit 50.

  In step S25, the failure diagnosis unit 50 acquires the amplitude (amplitude Am3) of the first error signal e1 from the microphone 28 in a state where only the cancellation sound CS (second reference sound RS2) is output. In subsequent step S26, the failure diagnosis unit 50 stops the output of the canceling sound CS.

  In step S27, the failure diagnosis unit 50 determines whether the output of the microphone 28 is normal. Specifically, the failure diagnosis unit 50 determines whether the amplitude Am3 of the first error signal e1 when the canceling sound CS (second reference sound RS2) is output exceeds the threshold value TH_am3. The threshold value TH_am3 is a threshold value for determining whether the output (first error signal e1) of the microphone 28 corresponds to the volume of the canceling sound CS, and for example, an experimental value or a simulation value may be used. it can.

  As described above, when the output of the microphone 28 is not normal (S14: NO), the cause is a malfunction of the failure diagnosis unit 50 of the ECU 22, a disconnection between the ECU 22 and the vibration actuator 32, and an operation of the second amplifier 30. A failure, a malfunction of the vibration actuator 32, a malfunction of the microphone 28, or a disconnection from the microphone 28 to the ECU 22 can be considered. If the output of the microphone 28 is normal in step S27 (S27: YES), among the above causes, the malfunction diagnosis unit 50 of the ECU 22 malfunctions, the malfunction of the microphone 28, and between the microphone 28 and the ECU 22 occur. The possibility of disconnection is denied. For this reason, the cause may be a disconnection from the ECU 22 to the vibration actuator 32, a malfunction of the second amplifier 30, or a malfunction of the vibration actuator 32, that is, an abnormal operation of the AVC system 76.

  Therefore, when the output of the microphone 28 is normal in step S27 (S27: YES), in step S28, the failure diagnosis unit 50 determines that data relating to the current diagnosis result (operation of the AVC system 76 is abnormal). ) Is stored in a non-volatile memory or volatile memory (not shown), and the process returns to the flowchart of FIG.

  If the output of the microphone 28 is not normal in step S27 (S27: NO), the reason why the output of the microphone 28 is not normal in step S14 is the disconnection between the ECU 22 and the vibration actuator 32, the second amplifier 30 The malfunction and the malfunction of the vibration actuator 32 are denied with high possibility. For this reason, the cause may be a malfunction of the failure diagnosis unit 50, a malfunction of the microphone 28, or a disconnection between the microphone 28 and the ECU 22, that is, an abnormal operation of the ANC system 66. If attention is paid only to the case where the output of the microphone 28 is not normal in step S27 (S27: NO), the disconnection between the ECU 22 and the speaker 26, the malfunction of the first amplifier 24, and the malfunction of the speaker 26 are also causes. However, since it is not related to the abnormality in step S14, the possibility that these failures have occurred is low.

  Therefore, when the output of the microphone 28 is not normal in step S27 (S27: NO), in step S29, the failure diagnosis unit 50 determines that the data related to the current diagnosis result (the operation of the ANC system 66 including the microphone 28 is abnormal). 2 is stored in a non-volatile memory or a volatile memory (not shown), and the process returns to the flowchart of FIG.

  Returning to FIG. 2, in step S <b> 7, the failure diagnosis unit 50 starts counting a timer TMR [seconds] indicating an elapsed time from the failure diagnosis process. In step S8, the failure diagnosis unit 50 determines whether a predetermined time has elapsed since the end of the failure diagnosis process. Specifically, failure diagnosis unit 50 determines whether timer TMR is equal to or greater than threshold value TH_tmr [seconds].

  If the predetermined time has not elapsed since the end of the failure diagnosis process (S8: NO), step S8 is repeated. When a predetermined time has elapsed since the end of the failure diagnosis process (S8: YES), in step S9, the failure diagnosis unit 50 adds vehicle identification information (vehicle ID) to the data stored in step S6. In step S10, the failure diagnosis unit 50 outputs the diagnosis result to the outside (for example, a vehicle management server if it is a factory).

FIG. 10 shows an example of data stored in step S9. In the example of FIG. 10, the ANC system 66 is operating normally when the frequency F is 30 Hz, 50 Hz, 80 Hz, or F _n Hz, that is, both the reference sound RS and the cancellation sound CS are output. The amplitude Am2 of the first error signal e1 is smaller than half of the amplitude Am1 of the first error signal e1 when only the reference sound RS is output. A vehicle ID is also added.

3. According to the present embodiment as described above, the control system 12 outputs the reference sound RS from the AVC system 76 and cancels the reference sound RS by the canceling sound CS from the ANC system 66. The failure diagnosis unit 50 determines an abnormality in the silencing performance of the ANC system 66. Accordingly, it is possible to automatically determine the abnormality of the silencing performance without involving the operator.

  Further, since the reference sound RS from the AVC system 76 is set as a pseudo vibration noise, the failure of the ANC system 66 is diagnosed by reproducing the traveling situation without running the vehicle 10 or starting the engine 14. It becomes possible to do.

  In the present embodiment, the third control signal Sc3 representing the reference sound RS is a sine wave signal having a plurality of different fixed frequencies F. Thereby, the reference sound RS is output at a plurality of different fixed frequencies F, and the silencing performance of the ANC system 66 can be evaluated for each control frequency.

  In the present embodiment, the vibration actuator 32 is installed in the subframe 36 of the vehicle 10. In general, a vibration isolating rubber is not disposed in the subframe, and it is easy to output vibration sound by the vibration actuator 32. Therefore, it is possible to output the reference sound RS suitably.

  In this embodiment, the failure diagnosis unit 50 sets an upper limit threshold TH_t_h and a lower limit threshold TH_t_l of the ambient temperature Tc (S2 in FIG. 2), and the ambient temperature Tc is lower than the lower limit threshold TH_t_l or higher than the upper limit threshold TH_t_h and outside the temperature range. In some cases (S2: NO), the abnormality determination of the silencing performance is not performed. As a result, failure diagnosis can be performed only under conditions suitable for failure diagnosis of the ANC system 66, and if the conditions are not suitable for failure diagnosis, it is possible to ask the worker to improve the ambient temperature Tc.

  Further, the failure diagnosis unit 50 sets a rotation speed threshold TH_e, which is a threshold value for the engine rotation speed Ne (S4 in FIG. 2), and when the engine rotation speed Ne exceeds the rotation speed threshold TH_e (S4: NO), the silencing performance Do not judge abnormalities. As a result, when the engine speed Ne exceeds the engine speed threshold TH_e, it is possible to prompt the operator to wait for the engine 14 to stop.

  Furthermore, the failure diagnosis unit 50 sets a silence determination threshold value TH_p that is a threshold value of the amplitude Ap of the first error signal e1 in a state where the speaker 26 and the vibration actuator 32 are not operated (S5 in FIG. 2), and the amplitude Ap is quiet. When the sex determination threshold TH_p is exceeded (S5: NO), the abnormality determination of the silencing performance is not performed. Thereby, when the quietness inside the vehicle 10 cannot be secured, it is possible to prompt the operator to stop the failure diagnosis or reduce the noise around the vehicle 10.

[B. Application of the present invention]
Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the description in this specification. For example, the following configuration can be adopted.

  In the above embodiment, the ANC system 66 cancels engine noise, but it may cancel road noise, or cancel both engine noise and road noise.

  In the above-described embodiment, the ANC system 66 and the AVC system 76 are configured by one ECU 22. However, the ANC system 66 and the AVC system 76 may be configured separately.

  In the above embodiment, in the control system 12 including the ANC system 66 and the AVC system 76, the abnormality of the silencing performance of the ANC system 66 is determined using the AVC system 76, but on the contrary, the AVC system 76 is used using the ANC system 66. It is also possible to determine an abnormality in the vibration control performance. That is, by outputting the reference sound RS from the ANC system 66 and outputting the canceling sound CS based on the canceling vibration CV from the AVC system 76, it is possible to determine whether the vibration damping performance of the AVC system 76 is abnormal. Alternatively, if the cancellation vibration CV is generated by the cancellation sound CS from the ANC system 66, a reference vibration RV based on the cancellation sound CS from the ANC system 66 is generated, and this reference vibration RV is canceled from the AVC system 76. By canceling out with the vibration CV, it is also possible to determine an abnormality in the vibration control performance of the AVC system 76.

  Further, instead of the combination of the ANC system 66 and the AVC system 76, a combination of a plurality of ANC systems 66 and a combination of a plurality of AVC systems 76 may be used.

  In the above embodiment, only one speaker 26, microphone 28, vibration actuator 32, and vibration sensor 34 are shown, but this is for ease of understanding of the invention. The speaker 26, the microphone 28, the vibration actuator 32, and the vibration sensor 34 can also be used. In that case, the number of other components is also changed as appropriate.

  In the above embodiment, a plurality of frequencies F of the reference sound RS are set, but one may be used. Moreover, although the reference sound RS of the different frequency F was output in order, you may output simultaneously, for example, if it comprises a harmonic (for example, 30 Hz and 60 Hz). Furthermore, the reference sound RS may not be a sine wave but may be another sound (for example, a chime sound, a melody sound, a single sound, a chord, or a sound reminiscent of the running state of the vehicle).

  In the above embodiment, the vibration actuator 32 is provided in the subframe 36, but the present invention is not limited to this. For example, the vibration actuator 32 may be installed on any of the body panel, tailgate, or trunk of the vehicle 10.

  In the above embodiment, the upper limit threshold TH_t_h and the lower limit threshold TH_t_l of the ambient temperature Tc, the rotation speed threshold TH_e that is the threshold of the engine speed Ne, and the quietness determination threshold TH_p that is the threshold of the amplitude Ap of the first error signal e1. Is set (S2, S4, S5 in FIG. 2), but only one or two may be used, or none may be used at all. Further, whether or not the abnormality of the silencing performance is determined may be determined based on another criterion.

DESCRIPTION OF SYMBOLS 10 ... Vehicle 12 ... Active vibration noise control system 22 ... Noise / vibration ECU (1st control signal production | generation part, 2nd control signal production | generation part)
26 ... Speaker (first output unit) 28 ... Microphone (first error detection unit)
32 ... Vibration actuator (second output unit) 34 ... Vibration sensor (second error detection unit)
36 ... Subframe 40 ... Reference signal generator (first reference signal generator, second reference signal generator)
DESCRIPTION OF SYMBOLS 50 ... Failure diagnosis part (failure diagnosis apparatus) 60 ... 1st adaptive filter 62 ... 1st reference signal correction | amendment part 64 ... 1st filter coefficient update part 66 ... ANC type | system | group (1st active vibration noise control apparatus)
70: second adaptive filter 72 ... second reference signal correcting unit 74 ... second filter coefficient correcting unit 76 ... AVC system (second active vibration noise control device)
Am1... Amplitude of first error signal e1 when ANC system 66 is not operating Am2... Amplitude CS of first error signal e1 when ANC system 66 is operating... Canceling sound (first canceling sound) CV. Canceling vibration (second canceling vibration)
e1 ... first error signal e2 ... second error signal NZ ... vibration noise RS ... reference sound
Sb: Reference signal (first reference signal, second reference signal)
Sc1 ... 1st control signal Sc2 ... 2nd control signal Sc3 ... 3rd control signal (reference sound signal) Sr1 ... 1st correction reference signal Sr2 ... 2nd correction reference signal Tc ... Ambient temperature TH_e ... Revolution threshold TH_p ... Quietness Determination threshold TH_t_h: upper limit threshold of ambient temperature Tc TH_t_l: lower limit threshold VN of ambient temperature Tc ... vibration W1 ... first filter coefficient W2 ... second filter coefficient

Claims (8)

A first control signal generating unit that generates a first control signal representing a first canceling sound that cancels vibration noise generated in the vehicle or a first canceling vibration that reduces the vibration noise by canceling vibration generated in the vehicle; A first active vibration noise control device having a first output unit that outputs the first canceling sound or the first canceling vibration based on the first control signal;
Based on the second control signal, a second control signal generating unit that generates a second control signal that represents a second canceling sound that cancels the vibration noise or a second canceling vibration that reduces the vibration noise by canceling the vibration. A second active vibration noise control device having a second output unit for outputting the second cancellation noise or the second cancellation vibration;
A failure diagnosis device for performing a failure diagnosis of the first active vibration noise control device,
The fault diagnosis apparatus is
A reference sound for evaluating the silencing performance of the first active vibration and noise control device is output by the second output unit, and the first active vibration and noise control device is actuated to operate the first canceling sound or the An active vibration noise control system characterized in that an abnormality in the silencing performance of the first active vibration noise control device is determined by canceling the reference sound with a first vibration sound based on a first cancellation vibration. The active vibration noise control system according to claim 1,
The first active vibration noise control device generates the first canceling sound or the first canceling vibration based on a reference sound signal that represents the reference sound and is input to the second output unit. Active vibration noise control system. The active vibration noise control system according to claim 1 or 2,
The first active vibration noise control device further detects a difference between the reference sound and the first canceling sound or the first vibration sound, and outputs a first error signal indicating the error. Part
The fault diagnosis apparatus is
The amplitude of the first error signal when the reference sound is output and the first canceling sound or the first vibration sound is not output, and the reference sound and the first canceling sound or the first vibration sound are output. An active vibration noise control system characterized in that an abnormality in the silencing performance of the first active vibration noise control device is determined by comparing the amplitude of the first error signal when it is being operated. The active vibration noise control system according to claim 2 or claim 3 dependent on claim 2,
The active sound and noise control system, wherein the reference sound signal is a plurality of sine wave signals having different fixed frequencies. The active vibration noise control system according to any one of claims 1 to 4,
The first control signal generation unit generates a first control signal representing the first canceling sound,
The first output unit is a speaker that outputs the first muting sound based on the first control signal,
The second control signal generation unit generates a second control signal representing the second cancellation vibration,
The active vibration noise control system, wherein the second output unit is a vibration actuator that outputs the second canceling vibration based on the second control signal. The active vibration noise control system according to claim 5,
The active vibration noise control system, wherein the vibration actuator is installed in any one of a subframe, a body panel, a tailgate, and a trunk of the vehicle. The active vibration noise control system according to any one of claims 4 to 6 dependent on claim 3 or claim 3,
The fault diagnosis apparatus is
A temperature range for determining whether or not the silencing performance abnormality can be determined, a rotational speed threshold value that is a threshold value of the engine rotational speed or the motor rotational speed of the vehicle for determining whether or not the silencing performance abnormality is possible, and Setting at least one of error thresholds, which is a threshold value of the error, for determining whether or not the abnormality of the silencing performance can be determined;
When the ambient temperature of the vehicle is out of the temperature range, when the engine speed or the motor speed exceeds the speed threshold, or when the error exceeds the error threshold, determination of abnormality in the silencing performance An active vibration and noise control system characterized by The active vibration noise control system according to claim 1,
The first active vibration noise control device further detects a first error which is an error between the vibration noise and the first canceling sound or an error between the vibration and the first canceling vibration. A first error detector that outputs a first error signal indicating
The second active vibration noise control device further detects a second error that is an error between the vibration noise and the second canceling sound or an error between the vibration and the second canceling vibration. A second error detector that outputs a second error signal indicating
The first control signal generator is
A first reference signal generation unit configured to generate a first reference signal based on the vibration noise or the vibration;
A first adaptive filter that generates the first control signal based on the first reference signal;
A first reference signal correction unit that corrects the first reference signal based on a transfer characteristic from the first output unit to the first error detection unit and outputs a first correction reference signal;
A first filter coefficient updating unit that sequentially updates filter coefficients of the first adaptive filter so that the first error signal is minimized based on the first error signal and the first corrected reference signal;
The second control signal generator is
A second reference signal generator for generating a second reference signal based on the vibration noise or the vibration;
A second adaptive filter that generates the second control signal based on the second reference signal;
A second reference signal correction unit that corrects the second reference signal based on a transfer characteristic from the second output unit to the second error detection unit and outputs a second correction reference signal;
A second filter coefficient updating unit that sequentially updates filter coefficients of the second adaptive filter so that the second error signal is minimized based on the second error signal and the second corrected reference signal. Features an active vibration noise control system.

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