JP2010054962A - Noise control device and noise control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently control noise by restricting a control space of a noise control object, in a position where a human body exists, and to provide a noise reduction effect surely in a head position of the human body. <P>SOLUTION: A control command value calculation section 32 of a control unit 30 specifies a set of seats where crews are seated based on a crew detection signal from a crew existence detecting sensor 40, and removes the control space corresponding to the seat position where the crews are not seated, from the control object, and the control space corresponding to the seat position where the crew members are seated is expanded, and a control command value creating filter for reducing noise in the expanded control space is selected. Based on the control command value creating filter and an acceleration signal from an accelerator sensor 10, a control command value is created. Then, the control command value is outputted to an actuator 20, to control wave application by the actuator 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a noise control device and a noise control method for reducing noise inside a structure by detecting a vibration of the structure and applying a wave that cancels the noise inside the structure.

2. Description of the Related Art Conventionally, there has been known a noise control device that measures noise generated as a vehicle travels in a passenger compartment or the like and generates sound waves and vibrations that cancel the noise to reduce noise. In this type of noise control device, if the configuration is such that the noise in the entire passenger compartment is uniformly reduced, there is a certain limit to the noise reduction at the position where the occupant is present. Attempts have also been made to reduce noise. For example, in Patent Document 1, detection means for detecting a riding state such as a seating position of an occupant is provided, and the noise reduction effect is small at a seat position where the occupant is not seated. There has been proposed a noise control device that can perform noise control efficiently by controlling the noise reduction effect to be large.
Japanese Patent No. 2778976

  However, in the noise control device described in Patent Document 1, since the control space to be subjected to noise control is limited to the seating position of the occupant, the noise reduction effect in the control space can be enhanced, but the seating of the occupant Since the size of the control space at the position does not change, for example, if the occupant's head position deviates from the control space due to a change in the occupant's posture, the noise reduction effect at the head position cannot be guaranteed. There was a point.

  The present invention was devised to solve the above-mentioned problems of the prior art, and can efficiently perform noise control by limiting the control space to be subjected to noise control to a position where a human body exists. In addition, an object of the present invention is to provide a noise control device and a noise control method capable of reliably obtaining a noise reduction effect at the head position of a human body.

  In order to solve the above problems, the present invention sets a control space to be subjected to noise control in advance for a plurality of positions where a human body inside the structure may exist, and When a human body is detected and the position where the human body actually exists is specified, and the human body does not exist at any of the multiple positions set in advance, noise control is performed on the control space corresponding to the position. And the operation of the wave applying means is controlled so as to reduce noise in the expanded control space by expanding at least one of the other control spaces corresponding to the position where the human body exists.

  According to the present invention, instead of performing noise control in the control space corresponding to the position where the human body does not exist, the control space corresponding to the position where the human body exists is expanded to reduce noise in the expanded control space. Since control is performed, efficient noise control can be performed, and a noise reduction effect can be reliably obtained at the head position of the human body.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention can be effectively applied to, for example, a vehicle noise control device that reduces noise in a vehicle cabin and improves passenger comfort. Below, the example which applied this invention to such a noise control apparatus for vehicles is demonstrated concretely.

  In general, the causes of vehicle interior noise entering from the outside of the vehicle are typically engine noise due to engine vibration, road noise due to road surface unevenness entering from tires during driving, There is a wind noise generated by the air flow. In the following embodiments, an example in which road noise is mainly reduced will be specifically described.

  FIG. 1 shows main propagation paths of vehicle body vibration and road noise caused by road surface unevenness.

  The vibration that is the main component of road noise that has entered the vehicle body from the tire 200 first enters a highly rigid beam-like member called the member 140 from the mounting portion of the axle 120 and the suspension 130. Thereafter, vibration propagates to a plate-like member called floor panel 110 surrounded by the member 140 and having relatively low rigidity, and the floor panel 110 vibrates. Then, the vibration of the floor panel 110 causes air vibrations in the vehicle interior and causes a resonance phenomenon in the vehicle interior, so that road noise can be heard in a predetermined space in the vehicle interior (hereinafter referred to as the control space 100). Become. In addition to the floor panel 110, noise is also generated when a roof panel or window glass (not shown) vibrates, but most of the road noise that enters mainly from the attachment portion of the suspension 130 is vibration of the floor panel 110. It is known that the causal relationship is high. For this reason, if noise control is performed so as to cancel road noise based on vibration of floor panel 110, road noise in control space 100 can be reduced. In addition, since all noise generated from the floor panel 110 is included as a control target, wind noise generated when air flows through part of the engine noise or the bottom of the vehicle body should be handled in the same way as road noise. Can do.

  In the noise control apparatus of this embodiment, as shown in FIG. 1, acceleration sensors 10a, 10b, 10c, 10d for vibration detection are provided on the floor panel 110 (hereinafter, these are collectively referred to as acceleration sensor 10). And actuators 20a and 20b (hereinafter, collectively referred to as actuator 20) serving as a wave application unit. Then, the vehicle interior noise is estimated based on the output signal of the acceleration sensor 10, a control command value for canceling the estimated vehicle interior noise is generated, and the actuator 20 is driven based on this control command value to the floor panel 110. Vehicle interior noise is reduced by applying vibration and applying control sound to cancel the noise into the vehicle interior.

  Here, in this embodiment, the method of estimating the noise of the control space 100 from the output signal of the acceleration sensor 10 is used without detecting the noise using the microphone. Since the acceleration sensor 10 installed on the floor panel 110 is used, road noise caused by the floor panel 110 is handled as a control target. Here, the reason why the floor panel 110 is selected as the installation location of the acceleration sensor 10 is that coherence with the vehicle interior noise (definition will be described later) is high.

  In addition, the scope of the effect of the present invention is not limited to the category of noise reduction due to vibration of the floor panel 110. For example, it can be applied to a noise generation source in a vehicle cabin generated by the same mechanism such as a dash panel, a windshield, a door panel, and a roof panel. In contrast, if the acceleration sensor 10 and the actuator 20 are installed in the part, similarly, noise generated by the vibration of the part can be reduced.

  FIG. 2 is a block diagram illustrating a schematic configuration of the noise control device of the present embodiment. The noise control device according to the present embodiment includes, in addition to the acceleration sensor 10 (10a to 10e) and the actuator 20 (20a, 20b) described above, occupant presence / absence detection sensors 40a, 40b that detect the presence / absence of occupants for each seat in the vehicle interior. (Hereinafter, these are collectively referred to as an occupant presence / absence detection sensor 40), and a control command value for reducing vehicle interior noise is calculated based on a signal obtained by the acceleration sensor 10 to control the actuator 20. And a control unit 30 to perform. An input signal to the control unit 30 is an output of the acceleration sensor 10 and an output of the occupant presence / absence detection sensor 40, and an output signal of the control unit 30 is a control command signal to the actuator 20.

  In FIG. 1 and FIG. 2, for the sake of simplicity, the number of acceleration sensors 10 is four and the number of actuators is two. However, the numbers of acceleration sensors 10 and actuators 20 are examples of these. The number is not limited to the above number, but may be any number that satisfies the following conditions.

Generally, the number of acceleration sensors 10 needs to be larger than the number of vibration sources. The specific number and installation positions of the acceleration sensors 10 may be determined so that the coherence between each acceleration sensor 10 and the sound pressure of noise in the control space 100 is sufficiently high (for example, 0.9 or more). Here, coherence C _xy (ω) is defined by the following equation (1), and represents the degree of the causal relationship between the signal x and the signal y.

In the equation (1), P _xy is a cross power spectrum between the signal x and the signal y, P _xx is an auto power spectrum of the signal x, and P _yy is an auto power spectrum of the signal y. P ^H represents a Hermitian transpose matrix of P.

  Further, a sufficient number of actuators 20 may be attached to appropriate positions on the floor panel 110 of the vehicle in order to reduce noise in the control space 100. The actuator 20 is not limited to the one installed on the floor panel 110, and for example, one installed on a part such as a dash panel, a windshield, a door panel, or a roof panel can be used. Furthermore, a speaker installed in the vehicle compartment can be used as the actuator 20.

  Here, a piezo-electric actuator that expands and contracts when a voltage is applied is used as the actuator 20. Further, as the occupant presence / absence detection sensor 40, a load sensor that is installed under the seat in the passenger compartment or behind the seat and detects the presence / absence of the occupant seated on the seat is used. Further, as the control space 100, four control spaces 100a, 100b, 100c, and 100d can be set in correspondence with the driver's seat and the passenger seat and the two rear seats. In particular, the noise control device of the present embodiment. Then, as will be described in detail later, instead of changing the position and range of the control space to be controlled according to the combination of seats on which the occupant is seated, and not performing noise control on seats without occupants, The control space corresponding to the seat on which the passenger is seated is expanded.

  As shown in FIG. 2, the control unit 30 includes amplification units 31 a to 31 h for signal amplification, and a control command value calculation unit 32 that calculates a control command value for the actuator 20 and outputs it as a control command signal. Yes.

  The amplifying units 31 a and 31 b amplify the occupant detection signal from the occupant presence / absence detection sensor 40 and output the amplified signal to the control command value calculation unit 32. The amplifying units 31 c to 31 f amplify the acceleration signal from the acceleration sensor 10 and output the amplified acceleration signal to the control command value calculating unit 32. The amplifying units 31 g and 31 h amplify the control command signal generated by the control command value calculating unit 32 and output the amplified signal to the actuator 20. The amplifying units 31a to 31h also have a function of converting between charge and voltage when the acceleration sensor 10 or the occupant presence / absence detection sensor 40 is a so-called charge charge type.

  As shown in FIG. 3, the control command value calculation unit 32 includes A / D conversion units 33 a and 33 b, a filter selection unit 34, a calculation unit 35, and a D / A conversion unit 36.

  The A / D converter 33a converts the passenger detection signals n1 and n2 detected by the passenger presence / absence detection sensor 40 and amplified by the amplifiers 31a and 31b into digital signals. The A / D converter 33b converts the acceleration signals α1, α2, α3, and α4 detected by the acceleration sensor 10 and amplified by the amplifiers 31c to 31f into digital signals. The D / A converter 36 converts the control command signal calculated by the calculator 35 into an analog signal and outputs the analog signal to the amplifiers 31g and 31h.

  The filter selection unit 34 selects and outputs a filter for generating a control command value based on information on a combination of seats on which an occupant is seated detected by the occupant presence / absence detection sensor 40.

  The calculation unit 35 uses the acceleration signals α1 to α4 output from the acceleration sensor 10 and the filter selected by the filter selection unit 34 to calculate a control command value so as to reduce noise in a space where an occupant is present.

  The control command value calculation unit 32 as described above can be realized, for example, by mounting the functions of the above-described units on the CPU of the microcomputer.

  FIG. 4 is a flowchart showing a flow of a series of processes in the control command value calculation unit 32. In the noise control apparatus of the present embodiment, the control command value calculation unit 32 of the control unit 30 repeatedly performs the process shown in the flowchart of FIG. 4 at a predetermined period, thereby driving the actuators 20a and 20b to perform noise control. .

  First, in step S101, acceleration signals α1 to α4 from the acceleration sensors 10a to 10d amplified by the amplification units 31c to 31f are A / D converted by the A / D conversion unit 33b and input to the calculation unit 32.

  Next, in step SS102, the occupant detection signals n1, n2 from the occupant presence / absence detection sensors 40a, 40b amplified by the amplifying units 31a, 31b are A / D converted by the A / D conversion unit 33a, and the filter selection unit 34 is obtained. To enter.

  Next, in step S103, the filter selection unit 34 executes a subroutine for selecting a control command value generation filter used for noise control based on the combination of seats on which the occupant is seated, which is obtained from the occupant detection signals n1 and n2. Then, the filter coefficient of the obtained control command value generation filter is transmitted to the calculation unit 35. Note that if there is no change from the occupant state one sample time ago, the filter is not updated, so the filter coefficient may not be transmitted.

  Next, in step S104, the calculation unit 35 executes a subroutine for calculating a control command value by a convolution operation using the acceleration signals α1 to α4 and the control command value generation filter selected by the filter selection unit 34. The calculated control command value is output to the D / A converter 36 as a control command signal.

  Next, in step S105, the control command signal from the calculation unit 35 is D / A converted by the D / A conversion unit 36, amplified by the amplification units 31g and 31h, and output to the actuators 20a and 20b.

  FIG. 5 is a flowchart showing a subroutine executed by the filter selection unit 34 in step S103 in the flowchart of FIG. When the occupant detection signals n1 and n2 from the occupant presence / absence detection sensors 40a and 40b are input, the filter selection unit 34 executes the subroutine of FIG. 4 and selects a control command value generation filter.

  First, in step S201, the filter selection unit 34 obtains occupant detection signals n1 and n2 from the occupant presence / absence detection sensors 40a and 40b, thereby calculating occupant position information indicating which seat is currently occupied by the occupant. .

  Next, in step S202, occupant position information one sample time before held in the memory is read.

  Next, in step S203, the current occupant position information calculated in step S201 is compared with the occupant position information one sample time before read in step S202 to determine whether the occupant position has changed. . If there is a change in the occupant position, the process proceeds to step S204, and if there is no change, the process proceeds to step S205.

  In step S204, only the current occupant position information is output to the calculation unit 35, and the subroutine of FIG. 5 is terminated.

  On the other hand, in step S205, based on the current occupant position information calculated in step S201, a subroutine for setting a control space for the seat where the occupant is present is executed, and information on the set control space is output.

  Next, in step S206, a control command value generation filter for controlling the control space set in step S205 is read from the memory. Here, each filter is described as being designed in advance and stored in the memory. However, the filter is not held in the memory, but the transfer function up to each control space candidate is held. Alternatively, an algorithm of recalculating a filter for controlling the control space determined in S205 may be employed. Details of the filter design method will be described later.

  Next, in step S207, the filter coefficient obtained in step S206 and the occupant position information obtained in step S201 are output to the calculation unit 35, and the subroutine of FIG. 5 is terminated.

  FIG. 6 is a flowchart showing a subroutine executed by the calculation unit 35 in step S104 in the flowchart of FIG. When the acceleration signals α1 to α4 are input from the acceleration sensors 10a to 10d and the occupant position information is input from the filter selection unit 34, the calculation unit 35 executes the subroutine of FIG. 5 to calculate the control command value. I do.

  First, in step S301, the calculation unit 35 determines whether or not the current occupant position information has been changed from the occupant position information one sample time ago. If the occupant position information has been changed, the calculation unit 35 proceeds to step S302. In step S303, the process proceeds to step S303.

  In step S302, the filter coefficient of the control command value generation filter is updated to the value obtained by the filter selection unit 34.

  Next, in step S303, the input acceleration signals α1 to α4 are multiplied by a control command value generation filter to calculate a control command value.

  Next, in step S304, the control command value calculated in step S303 is output as a control command signal to the D / A converter 36, and the subroutine of FIG. 6 is terminated.

FIG. 7 is a block diagram illustrating a method for designing a control command value generation filter. In the figure, a block denoted by “C” represents a control command value generation filter to be designed, and a block denoted by “G _α ” represents a transfer function from the acceleration signal α when the vehicle travels to the sound pressure in the control space. Represents. Here, the control space is appropriately set from the occupant position information by a method described later. In the figure, a block denoted as “G _p ” represents a transfer function from the actuator 20 to the sound pressure in the control space, and a block denoted as “G _a ” represents from the actuator 20 to the acceleration signal α. Represents the transfer function. In FIG. 7, the signal line is described as a single line. However, when there are a plurality of acceleration sensors 10, actuators 20, and control spaces 100 as in this embodiment, a plurality of signal lines corresponding to the number of the acceleration sensors 10, actuators 20, and control spaces 100 are used. In this case, each block is a multi-input / output block.

Further, in the figure, a block denoted by “W _c3 ” and a block denoted by “W _c4 ” are design parameters (weight functions), respectively. "W _c3" is to have a frequency characteristic of the acceleration to be input when the vehicle is traveling. As a result, it becomes possible to perform greater control at a frequency with a large sound pressure. “W _c4 ” is used to limit the maximum voltage of the control command signal. Increasing this value will decrease the gain of the corresponding actuator 20. This value may also have frequency characteristics. In this case, the gain of the actuator 20 can be lowered only in a certain frequency band.

  The transfer function of each block described above uses a mathematical model expressed by a differential equation or Laplace transform. This modeling may be performed as follows.

For the transfer function “G _p ”, white noise or an impulse signal is input to the actuator 20, and system identification is performed using the sound pressure signal and the input signal in the control space determined according to the occupant position obtained at that time. Can be obtained. The transfer function “G _a ” can be obtained by inputting white noise or an impulse signal to the actuator 20 and performing system identification using the acceleration signal α obtained at that time. System identification methods include, for example, “Structural Dynamical Toolbox”, which is a tool box of the control system design tool MATLAB (manufactured by The MathWorks, registered trademark), literature “Adachi,“ System identification for control ”, Tokyo Denki University The subspace identification method described in “Publishing Bureau, 1996” may be used. The transfer function “G _α ” can be obtained by measuring the acceleration signal α and the sound pressure level when the vehicle is running and using the above method.

At this time, the filter “that minimizes the norm of the transfer function from α to SPL and the transfer function from α to u while ensuring the stability of the closed loop created by the filter“ C ”and the transfer function“ G _a ”. C "is designed. Various design methods can be considered. For example, the H∞ control method and the H2 control method described in the literature “Hosoe, Araki,“ Control system design—H∞ control and its application ”, Asakura Shoten, 1994” are used. Can be designed.

In this embodiment, the control command value generation filter is designed using two design parameters “W _c3 ” and “W _c4 ” as design parameters (weight functions). It is also possible to design using other design parameters (weight function). Further, when the transfer functions “G _α ”, “G _p ”, and “G _a ” are modeled as a continuous time system, the obtained filter is discretized using a Tustin transform or the like, or the transfer function “G _The digital controller may be designed by modeling _α ′, “G _p ”, and “G _a ” as a discrete time system and using a design method for the discrete time system.

  Next, a method for setting the control space according to the occupant position, that is, a method for setting a wide control space for the seat on which the occupant is currently seated will be described with a specific example. The noise control apparatus according to the present embodiment, when there is a seat where no occupant is seated, does not perform noise control in the control space corresponding to the seat, but instead of the control space corresponding to the seat where the occupant is seated. The noise reduction effect can be obtained in a wide range by expanding.

  FIG. 8 and FIG. 9 are schematic diagrams for explaining candidate positions of the control space to be added to the seat on which the passenger is seated.

  In the present embodiment, as shown in FIG. 8, with respect to the control space 100 originally set for each seat, the space at a position where the control space 100 is moved to the front side in the front-rear direction perpendicular to the back surface of the seat. 110a and a space 110b at a position where the control space 100 is moved to the lower side (or the upper side) in a plane parallel to the back surface of the seat are candidates for additional control space. Further, as shown in FIG. 9, with respect to the control space 100 originally set for each seat, the control space 100 is moved to the right (or left) in the left-right direction in a plane parallel to the back of the seat. The position space 110c is a candidate for a control space to be added. 8 and 9, only the control space 100 corresponding to the driver's seat is illustrated, but the seats with respect to the control space 100 that is originally set are similarly located at the positions corresponding to the other seats. Control space candidates to be added in the front-rear direction, the up-down direction, and the left-right direction are set with respect to the back surface of each. In this case, priorities are determined in advance for all seats, and if there are seats where no occupants are seated, the control space is preferentially expanded from the seats with higher priorities among the other seats. .

  The control space candidates 110 a to 110 c to be added may be set at positions where the correlation with the original control space 100 is small. For example, the magnitude of the correlation can be calculated by installing a microphone array in the vicinity of the occupant's head position, measuring the noise during the traveling of the vehicle with this microphone array, and calculating the correlation coefficient between the microphones. . With this method, by setting the control space candidates 110a to 110c to be added at positions where the correlation coefficient with respect to the original control space 100 is a predetermined value or less, it is possible to perform noise control in a wider space. . In addition, in the examples shown in FIGS. 8 and 9, the control space candidates 110a to 110c to be added are limited to one specific point in each direction, but the control space candidates to be added at two or more points in each direction. Candidates can also be set.

  FIG. 10 is a flowchart showing a subroutine (subroutine executed by the filter selection unit 34 in step S205 of the flowchart of FIG. 5) for determining an additional control space from the new control space candidates set by the above method. . When the current occupant position information has been changed from the occupant position information of one sample time ago, the filter selection unit 34 executes the subroutine of FIG. 10 and is wide with respect to the seat on which the occupant is seated. Set control space by range.

  First, in step S401, the filter selection unit 34 identifies a set of seats on which the occupant is seated based on the current occupant position information obtained in step S201 in the flowchart of FIG.

  Next, in step S402, the actuator 20 that is operating normally among the actuators 20 currently used is identified. At this time, the actuator 20 that is operating normally may be identified by any method. For example, if an acceleration sensor is installed in the vicinity of the actuator 20, it is determined whether or not the output signal from the acceleration sensor when a test signal is input to the actuator 20 is greater than or equal to a predetermined value. Normal / abnormal can be determined.

  Next, in step S403, it is determined whether or not the number of normal actuators 20 is greater than the number of seats on which a passenger is seated, that is, the number of seats on which noise control is performed. If the number of normal actuators 20 is greater than the number of seats that perform noise control, the process proceeds to step S404. If the number of normal actuators 20 is smaller, the position of the control space set in advance for all seats on which the occupant is seated is output. Then, the subroutine of FIG. 10 is completed.

  In step S404, the vertical space (the space 110b shown in FIG. 8) in the plane parallel to the back surface of the seat is added as a new control space from the above-described high priority seats in the seat where the occupant is seated. To do.

  Next, in step S405, the total number of control spaces after adding a new control space in step S404 is compared with the number of actuators 20 operating normally. Then, if the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S406. If the number of normal actuators 20 is small, the positions of all the control spaces including the control space added in step S404 are output. Exit the subroutine.

  In step S406, the front-rear direction space (the space 110a shown in FIG. 8) perpendicular to the back surface of the seat is added as a new control space from the above-described high priority seats in the seat where the occupant is seated.

  Next, in step S407, the total number of control spaces after adding a new control space in step S406 is compared with the number of actuators 20 operating normally. If the number of normal actuators 20 is greater than the number of control spaces, the process proceeds to step S408, and if less, the positions of all control spaces including the control spaces added in steps S404 and S406 are output. The subroutine of FIG. 10 is terminated.

  In step S408, the left-right space in the plane parallel to the back of the seat (the space 110c shown in FIG. 9) is added as a new control space from the above-described high-priority seat in the seat where the occupant is seated. To do. Then, the positions of all control spaces including the control space added so far are output, and the subroutine of FIG. 10 is terminated.

  In the noise control device according to the present embodiment, the filter selecting unit 34 executes the above subroutine to set the control space for the seat on which the occupant is seated, thereby obtaining the following effects.

  That is, in step S403, the number of seats that perform noise control is compared with the number of normal actuators 20. If the number of normal actuators 20 is greater than the number of seats that perform noise control, Since the corresponding control space is expanded, the control space can be changed efficiently.

  Further, in step S404, by increasing the control space in the vertical direction in the plane parallel to the back of the seat, for example, there is a difference in the seat height of the occupant sitting on the seat such as an adult and a child. Even in some cases, noise in the passenger's head space can be reliably reduced.

  In step S406, the control space is expanded in the front-rear direction perpendicular to the back surface of the seat, for example, the ear position is moved back and forth by rotating the head so that the occupant seated in the seat faces sideways. Even in the case of deviation, the noise reduction effect can be maintained.

  In step S408, the control space is expanded in the left-right direction in the plane parallel to the back of the seat, so that even if the occupant seated in the seat translates the head from side to side, the noise is increased. The reduction effect can be maintained.

  Further, in step S404, step S406, and step S408, since the reference of the direction in which the control space is expanded is not the floor panel but the back of the seat, the head position of the occupant can be obtained even when the occupant is reclining the back of the seat. A new control space can be accurately added to the range in which the robot can move.

  In this embodiment, the control space is added on condition that the number of normal actuators 20 is larger than the number of control spaces. However, in actuality, the total after adding the control space is added. Even when the number of control spaces exceeds the number of normal actuators 20, it is possible to reduce noise in each control space. Therefore, it is possible to omit the step of determining whether or not to add a new control space by comparing the number of normal actuators 20 and the number of control spaces. In this case, for example, a vehicle occupant If an input device that accepts an operation input is provided, and a process for adding a new control space (the process in steps S404, S406, and S408) is performed in response to an operation input by an occupant using the input device. Good. Further, in the present embodiment, when the number of control spaces becomes equal to or greater than the number of normal actuators 20, the process of adding the control space is terminated and the positions of all control spaces to be controlled are determined and determined. The noise control is performed by switching to a filter for performing noise control in the control space, but the timing for performing this filter switching and noise control depends on the operation input by the occupant using the input device. You may make it specify.

  FIG. 11 is a flowchart showing another example of a subroutine (a subroutine executed by the filter selection unit 34 in step S205 in the flowchart of FIG. 5) for determining an additional control space from new control space candidates. The filter selection unit 34 may set the control space for the seat on which the occupant is seated by executing the subroutine of FIG. 11 instead of the subroutine of FIG. The subroutine shown in FIG. 11 gives priority to the control space for seats other than the driver's seat on the premise that the driver of the vehicle is an adult and does not move his head much compared to other seats. It is intended to expand to.

  First, in step S501, the filter selection unit 34 identifies a set of seats on which the occupant is seated based on the current occupant position information obtained in step S201 in the flowchart of FIG.

  Next, in step S502, the actuator 20 that is currently operating is identified from among the actuators 20 currently used.

  Next, in step S503, it is determined whether or not the number of normal actuators 20 is greater than the number of seats on which a passenger is seated, that is, the number of seats on which noise control is performed. If the number of normal actuators 20 is greater than the number of seats that perform noise control, the process proceeds to step S504. If the number of normal actuators 20 is smaller, the position of the control space that is set in advance for all seats on which occupants are seated is output. Then, the subroutine of FIG. 11 is completed.

  In step S504, it is determined whether the occupant is seated only on the driver's seat. If the seat on which the occupant is seated is not only the driver's seat, the process proceeds to step S505. If the seat on which the occupant is seated is only the driver's seat, the process proceeds to step S511.

  In step S505, in the seats where passengers other than the driver's seat are seated, a vertical space (space 110b shown in FIG. 8) in the plane parallel to the back surface of the seat is newly selected from the above-described high priority seats. Added as a control space.

  Next, in step S506, the total number of control spaces after adding a new control space in step S505 is compared with the number of actuators 20 operating normally. Then, if the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S507. If the number of normal actuators 20 is small, the positions of all the control spaces including the control space added in step S505 are output. Exit the subroutine.

  In step S507, in the seats where passengers other than the driver's seat are seated, a space in the front-rear direction perpendicular to the back of the seat (the space 110a shown in FIG. 8) is renewed as a new control space. Add as

  Next, in step S508, the total number of control spaces after adding a new control space in step S507 is compared with the number of actuators 20 operating normally. Then, if the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S509. If the number of normal actuators 20 is small, the positions of all control spaces including the control spaces added in step S505 and step S507 are output. The subroutine of FIG. 11 is terminated.

  In step S509, among the seats where passengers other than the driver's seat are seated, a left-right space (space 110c shown in FIG. 9) in the plane parallel to the back of the seat is newly created from the above-described high priority seats. Added as a control space.

  Next, in step S510, the total number of control spaces after adding a new control space in step S509 is compared with the number of actuators 20 operating normally. If the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S511. If the number of normal actuators 20 is small, the positions of all control spaces including the control spaces added in steps S505, S507, and S509 are output. Then, the subroutine of FIG. 11 is completed.

  In step S511, in the driver's seat, a vertical space (space 110b shown in FIG. 8) in a plane parallel to the back of the seat is added as a new control space.

  Next, in step S512, the total number of control spaces after adding a new control space in step S511 is compared with the number of actuators 20 operating normally. If the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S513. If the number of normal actuators 20 is small, all control spaces including the control spaces added in steps S505, S507, S509, and S511 are included. The position is output and the subroutine of FIG. 11 is terminated.

  In step S513, in the driver's seat, a space in the front-rear direction perpendicular to the back of the seat (the space 110a shown in FIG. 8) is added as a new control space.

  Next, in step S514, the total number of control spaces after adding a new control space in step S513 is compared with the number of actuators 20 operating normally. If the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S515. If the number of normal actuators 20 is small, all the control spaces including the control spaces added in steps S505, S507, S509, S511, and S513 are included. The position of the control space is output and the subroutine of FIG. 11 is terminated.

  In step S515, in the driver's seat, a left-right space (space 110c shown in FIG. 9) in a plane parallel to the back of the seat is added as a new control space. Then, the positions of all control spaces including the control space added so far are output, and the subroutine of FIG. 11 is terminated.

  By the way, in the example demonstrated above, as a candidate of the control space newly added with respect to the seat where the passenger | crew is seating, the space 110a of the front-back direction perpendicular | vertical to the back surface of a seat, and the in-plane parallel to the back surface of a seat Although the vertical space 110b and the horizontal space 110c in the plane parallel to the back of the seat are mentioned, for example, as shown in FIG. If a 120 or the like is installed so that the height position of the occupant's head can be detected by using the distance measuring sensor 120 or the like, the position of the control space in the vertical direction can be determined. It is only necessary to expand the control space only in the front-rear direction and the left-right direction, which is a simple direction, and the control space can be expanded more efficiently.

  FIG. 13 is a flowchart showing a subroutine (a subroutine executed by the filter selection unit 34 in step S205 of the flowchart of FIG. 5) for determining the control space when the height position of the occupant's head can be detected. is there. When the height position of the occupant's head can be detected, the filter selection unit 34 executes the subroutine of FIG. 13 instead of the subroutine of FIG. 10 or FIG. Set the control space for.

  First, in step S601, the filter selection unit 34 specifies a set of seats on which the occupant is seated based on the current occupant position information obtained in step S201 in the flowchart of FIG.

  Next, in step S602, the actuator 20 that is operating normally among the actuators 20 currently used is specified.

  Next, in step S603, it is determined whether or not the number of normal actuators 20 is greater than the number of seats on which a passenger is seated, that is, the number of seats on which noise control is performed. If the number of normal actuators 20 is greater than the number of seats that perform noise control, the process proceeds to step S604. Then, the subroutine of FIG. 13 is completed.

  In step S604, the height position of the occupant head is detected by the distance measuring sensor 120 installed above the occupant's head, and the vertical position of the control space in the seat on which the occupant is seated is determined. Fix in position.

  Next, in step S605, in the seat where the occupant is seated, a space in the front-rear direction perpendicular to the back of the seat (the space 110a shown in FIG. 8) is added as a new control space.

  Next, in step S606, the total number of control spaces after adding a new control space in step S605 is compared with the number of actuators 20 operating normally. Then, if the number of normal actuators 20 is larger than the number of control spaces, the process proceeds to step S607. If the number of normal actuators 20 is small, the positions of all control spaces including the control space added in step S605 are output. Exit the subroutine.

  In step S607, in the seat on which the occupant is seated, a left-right space (space 110c shown in FIG. 9) in a plane parallel to the back of the seat is added as a new control space. Then, the positions of all control spaces including the control space added so far are output, and the subroutine of FIG. 13 is terminated.

  As described above, when the control space is set for the seat on which the occupant is seated by executing the subroutine of FIG. 13 by the filter selection unit 34, the control in the seat on which the occupant is seated is performed. Since the position in the vertical direction of the space is fixed and the control space can be expanded in the front-rear direction and the left-right direction, which are uncertain directions, the control space can be efficiently expanded.

  In the above example, only the height position of the occupant's head is detected by using the distance measuring sensor 120 installed on the occupant's head. For example, as shown in FIG. If a similar distance measuring sensor 130 or the like is installed on the front side so that the front / rear position (position in the vehicle front / rear direction) of the occupant's head can be detected using the distance measuring sensor 130 or the like, the vertical direction Since the position of the control space in the front-rear direction can be determined, it is only necessary to expand the control space only in the left-right direction, which is an uncertain direction, and the control space can be expanded more efficiently. Is possible.

  FIG. 15 shows a subroutine (a subroutine executed by the filter selection unit 34 in step S205 in the flowchart of FIG. 5) for determining the control space when the height position and the front-rear position of the passenger's head can be detected. It is a flowchart to show. When the height position and the front-rear position of the occupant's head can be detected, the filter selection unit 34 executes the subroutine of FIG. 15 instead of the subroutine of FIG. 10, FIG. 11 or FIG. A control space is set for the seat on which is seated.

  First, in step S701, the filter selection unit 34 identifies a set of seats on which the occupant is seated based on the current occupant position information obtained in step S201 in the flowchart of FIG.

  Next, in step S702, the actuator 20 that is operating normally among the actuators 20 currently used is identified.

  Next, in step S703, it is determined whether or not the number of normal actuators 20 is greater than the number of seats on which a passenger is seated, that is, the number of seats on which noise control is performed. If the number of normal actuators 20 is greater than the number of seats that perform noise control, the process proceeds to step S704. If the number of normal actuators 20 is smaller, the position of the control space set in advance for all seats on which the occupant is seated is output. Then, the subroutine of FIG. 15 is completed.

  In step S704, the height position of the occupant head is detected by the distance measuring sensor 120 installed on the occupant's head, and the vertical position of the control space in the seat on which the occupant is seated is determined as the height of the occupant head. Fix in position.

  Next, in step S705, the front-rear position of the occupant head is detected by the distance measuring sensor 130 installed in front of the occupant head, and the position in the front-rear direction of the control space in the seat on which the occupant is seated is determined. Fix the front and back positions of the part.

  Next, in step S706, in the seat on which the occupant is seated, a left-right space (space 110c shown in FIG. 9) in a plane parallel to the back of the seat is added as a new control space. Then, the positions of all control spaces including the added control space are output, and the subroutine of FIG. 15 is terminated.

  As described above, when the control space is set for the seat on which the occupant is seated by executing the subroutine of FIG. 15 by the filter selection unit 34, the control on the seat on which the occupant is seated is performed. Since the position of the space in the vertical direction and the front-back direction can be fixed and the control space can be expanded only in the left-right direction, which is an uncertain direction, the control space can be expanded more efficiently.

  FIG. 16 shows an example of the noise reduction effect when the noise control is performed by enlarging the control space in the seat where the occupant is seated by the noise control device of the present embodiment (Example), where the control space is fixed. It is the figure shown in contrast with the case (comparative example). Note that the horizontal axis in FIG. 16 indicates the position in the horizontal direction when a space including an occupant head near a certain seat is viewed from the front side of the vehicle, and the vertical axis in FIG. 16 indicates the degree of noise reduction effect. Show. Moreover, the solid line graph in the figure represents the noise reduction effect in the example, and the broken line graph in the figure represents the noise reduction effect in the comparative example.

  As shown in FIG. 16, in the comparative example, the control space is fixedly set around the position of “b” in the figure, and therefore, in the range from “a” to “c” around “b”. Although the noise reduction effect is obtained, the noise reduction effect cannot be obtained in the range from “c” to “e”. On the other hand, in the embodiment, a control space centered on the position “d” in the figure is added to the control space centered on the position “b” in the figure, so that a wide range of control space can be obtained. Therefore, the noise reduction effect can be obtained in a wide range from “a” to “e”.

  As described above in detail with specific examples, in the noise control device according to the present embodiment, the control command value calculation unit 32 of the control unit 30 is based on the passenger detection signal from the passenger presence / absence detection sensor 40. Identify the set of seats on which the passengers are seated. Then, the control space corresponding to the seat position where the occupant is not seated is excluded from the control object, and instead, the control space corresponding to the seat position where the occupant is seated is expanded, and the noise in the expanded control space is increased. A control command value generation filter that reduces the control command value is selected, and a control command value is generated based on the control command value generation filter and the acceleration signal from the acceleration sensor 10. Then, the control command value is output to the actuator 20 to control the wave application by the actuator 20. Therefore, according to the noise control device of the present embodiment, efficient noise control can be performed by effectively using the limited actuator 20, and the head position of the occupant has changed due to a change in the posture of the occupant. Even in this case, the noise reduction effect can be reliably obtained at the head position of the passenger.

  Further, according to the noise control device of the present embodiment, when there is a seat on which the occupant is not seated, by expanding the control space corresponding to the seat on which the occupant is seated in the vertical direction of the seat, for example, Even when there is a difference in the height of the occupant seated in the seat, such as an adult and a child, noise in the occupant's head space can be reliably reduced.

  Further, according to the noise control device of the present embodiment, when there is a seat on which the occupant is not seated, by expanding the control space corresponding to the seat on which the occupant is seated in the front-rear direction of the seat, for example, The noise reduction effect can be maintained even when the ear position is shifted back and forth by rotating the head so that the occupant seated in the seat faces sideways.

  Further, according to the noise control device of the present embodiment, when there is a seat on which the occupant is not seated, the control space corresponding to the seat on which the occupant is seated is expanded in the left-right direction of the seat. Even when the occupant seated in the seat translates the head from side to side, the noise reduction effect can be maintained.

  In addition, according to the noise control device of the present embodiment, the distance sensor 120 that detects the height position of the head of the occupant is provided, and when there is a seat where the occupant is not seated, the seat where the occupant is seated Is expanded at the height position detected by the distance measuring sensor 120 in the front-rear direction of the seat or in the left-right direction of the seat, so that the control space in the seat on which the passenger is seated The control space can be expanded in the front-rear direction and the left-right direction, which are uncertain directions, and the control space can be efficiently expanded.

  In addition, according to the noise control device of the present embodiment, the distance measuring sensor 120 that detects the height position of the head of the occupant and the distance measuring sensor 130 that detects the front and rear position of the head of the occupant are provided. When there is a seat that is not seated, the control space corresponding to the seat on which the occupant is seated is the height position detected by the distance measuring sensor 120 and the front and rear position detected by the distance measuring sensor 130. By expanding in the left-right direction, the position of the control space in the seat in which the occupant is seated can be fixed in the vertical direction and the front-back direction, and the control space can be expanded only in the left-right direction, which is an uncertain direction The control space can be expanded more efficiently.

  Further, according to the noise control apparatus of the present embodiment, when there is an input device that receives an operation input by a vehicle occupant and there is a seat in which the occupant is not seated, a control space corresponding to the seat in which the occupant is seated Is expanded according to the operation input by the occupant using the input device, so that the noise control reflecting the occupant's intention can be performed.

  In addition, according to the noise control device of the present embodiment, when there is a seat where no occupant is seated, at least one of the control spaces corresponding to the seat where the occupant is seated is correlated with the original control space. By expanding the number to a position equal to or less than a predetermined value, it is possible to include in the control space a space where the noise reduction effect was not originally obtained, and it is possible to perform noise control in a wider space.

  Further, according to the noise control device of the present embodiment, the number of normal actuators 20 is compared with the number of seats on which the occupant is seated, and when the number of normal actuators 20 is large, the occupant is seated. By enlarging at least one of the control spaces corresponding to the seats that are present, the control space can be expanded to the occupant's head position without significantly reducing the noise reduction effect in each control space. Control can be realized.

  Further, according to the noise control device of the present embodiment, when there is a seat on which the occupant is not seated, at least one of the control spaces corresponding to the seat on which the occupant is seated is based on the back surface of the seat. For example, even when the occupant is reclining the back of the seat, the control space can be expanded to a range in which the occupant's head position can move. Noise can be reliably reduced.

  The embodiment described above is merely an example of application of the present invention, and the technical scope of the present invention is not intended to be limited to the contents described in the above embodiment. Absent. That is, the technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiments, but includes various modifications, changes, alternative techniques, and the like that can be easily derived from this disclosure.

  For example, the embodiment described above is an example in which the present invention is applied to a vehicle noise control device that reduces noise in a vehicle cabin and improves passenger comfort. The present invention can be widely applied not only to a conventional noise control device but also to a noise control device that reduces noise in a closed space inside a structure.

It is a figure which shows the main propagation path | route of the vibration of a vehicle body and road noise by the influence of the unevenness | corrugation of a road surface, (a) is the schematic diagram which looked at the floor panel of the vehicle from diagonally upward, (b) is horizontal in the tire vicinity of the vehicle It is the schematic diagram seen in the direction. It is a block diagram explaining the schematic structure of the noise control apparatus to which this invention is applied. It is a block diagram which shows the internal structure of a control command value calculation part. It is a flowchart which shows the flow of a series of processes in a control command value calculation part. It is a flowchart which shows the subroutine performed by step S103 of FIG. It is a flowchart which shows the subroutine performed by step S104 of FIG. It is a block diagram explaining the design method of a control command value generation filter. It is a schematic diagram explaining the candidate position of the control space added with respect to the seat where the passenger | crew is seated. It is a schematic diagram explaining the candidate position of the control space added with respect to the seat where the passenger | crew is seated. It is a flowchart which shows the subroutine performed by step S205 of FIG. It is a flowchart which shows the other example of the subroutine performed by step S205 of FIG. It is a schematic diagram which shows a mode that the ranging sensor was installed in the passenger | crew's overhead position in the vehicle body. It is a flowchart which shows the further another example of the subroutine performed by step S205 of FIG. It is a schematic diagram which shows a mode that the ranging sensor was installed in the passenger | crew's overhead position and the front side in the vehicle body. It is a flowchart which shows the further another example of the subroutine performed by step S205 of FIG. The figure which shows an example of the noise reduction effect at the time of performing noise control by expanding the control space in the seat where the passenger | crew is seated by the noise control apparatus of this embodiment compared with the case where control space is fixed It is.

Explanation of symbols

10 (10a to 10d) Acceleration sensor 20 (20a, 20b) Actuator 30 Control unit 32 Control command value calculation unit 34 Filter selection unit 35 Calculation unit 40 (40a, 40b) Occupant presence / absence detection sensor 100 (100a to 100d) Control space 120 , 130 Distance sensor

Claims (12)

A sensor for detecting the vibration of the structure;
Wave applying means for applying a wave for reducing noise in the structure;
Control means for controlling the operation of the wave applying means based on the detection signal of the sensor;
Detecting means for detecting a human body existing inside the structure,
The control means sets a control space to be subjected to noise control in advance for a plurality of positions where a human body inside the structure may exist, and based on a detection result by the detection means. When the position where the human body actually exists inside the structure is specified and the human body does not exist at any of a plurality of positions where the control space is set in advance, the control space corresponding to the position is determined from the target of noise control. And at least one of the other control spaces corresponding to the position where the human body exists is enlarged to control the operation of the wave applying means so as to reduce noise in the enlarged control space. Noise control device. The structure is a vehicle body;
The control means sets the control space in advance with respect to the position of the head of the occupant seated in each seat in the passenger compartment, and the seat on which the occupant is actually seated based on the detection result of the detection means If there is a seat where no occupant is seated, the control space corresponding to the seat is excluded from the target of noise control, and at least one of the other control spaces corresponding to the seat where the occupant is seated The noise control apparatus according to claim 1, wherein the operation of the wave applying unit is controlled so as to reduce noise in the expanded control space.   The control means, when there is a seat where no occupant is seated, expands at least one of the control spaces corresponding to the seat where the occupant is seated in the vertical direction of the seat. 2. The noise control device according to 2.   The said control means expands at least 1 of the control space corresponding to the seat in which the passenger | crew is seated in the front-back direction of the said seat, when there exists the seat which the passenger | crew is not seated. 2. The noise control device according to 2.   The control means, when there is a seat where no occupant is seated, expands at least one of the control spaces corresponding to the seat where the occupant is seated in the left-right direction of the seat. 2. The noise control device according to 2. Further comprising a head height position detecting means for detecting the height position of the head of the occupant,
In the case where there is a seat on which the occupant is not seated, the control means has at least one of the control spaces corresponding to the seat on which the occupant is seated, the height position detected by the head height position detection means. The noise control device according to claim 2, wherein the noise control device expands in the front-rear direction of the seat or in the left-right direction of the seat. A head height position detecting means for detecting the height position of the occupant head;
A head front and rear position detecting means for detecting the position of the passenger head in the vehicle front and rear direction;
In the case where there is a seat on which the occupant is not seated, the control means has at least one of the control spaces corresponding to the seat on which the occupant is seated, the height position detected by the head height position detection means. The noise control apparatus according to claim 2, wherein the noise control apparatus expands in the left-right direction of the seat at the front-rear position detected by the head front-rear position detecting means. It further comprises an input means for receiving an operation input by a passenger,
The control means expands at least one of the control spaces corresponding to the seat on which the occupant is seated according to an operation input by the occupant using the input means when there is a seat on which the occupant is not seated. The noise control apparatus according to claim 2.   In the case where there is a seat on which no occupant is seated, the control means has at least one control space corresponding to the seat on which the occupant is seated with a predetermined correlation coefficient for the control space. The noise control device according to any one of claims 2 to 8, wherein the noise control device expands to the following position.   The control means expands at least one of the control spaces corresponding to the seat on which the occupant is seated when the number of the wave applying means that normally operate is larger than the number of seats on which the occupant is seated. The noise control device according to any one of claims 2 to 9, wherein   The said control means expands at least 1 of the control space corresponding to the seat in which the passenger | crew is seated in the direction on the basis of the back surface of the said seat. The noise control device described in 1. A noise control method for detecting noise in a structure by a vibration sensor and reducing noise in the structure by applying a wave according to a detection signal of the sensor,
A control space to be subjected to noise control is set in advance for a plurality of positions where a human body inside the structure may exist, and a human body existing inside the structure is detected and actually detected. If a human body does not exist at any of a plurality of positions for which a control space is set in advance, the control space corresponding to the position is excluded from noise control targets and the human body exists. A noise control method, comprising: enlarging at least one of the other control spaces corresponding to the position to be controlled and controlling the operation of the wave applying means so as to reduce noise in the enlarged control space.

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