Vibration control system

Abstract

The present disclosure relates to a vibration control system that makes it possible to suppress vibration noise in a more suitable manner. A vibration control system according to the present disclosure is configured to include: one or more acceleration sensors that are provided in a vehicle body of a vehicle, and acquire vibration information by detecting vibration; and one or more actuators that are provided in a control target portion to be subjected to vibration control in the vehicle body, and control the vibration of the control target portion in accordance with the vibration information of the acceleration sensor provided at least at a vibration detection position different from the control target portion. The technology according to the present disclosure can be applied to, for example, a vibration noise canceling system.

Description

Vibration control system

[0001] The present disclosure relates to a vibration control system, and particularly to a vibration control system capable of realizing suppression of vibration noise in a more suitable manner.

[0002] In recent years, with the spread of electric vehicles (EVs), the quietness inside the vehicle cabin has improved, while the need to suppress the noise inside the vehicle cabin generated during driving has increased.

[0003] Among them, an active noise cancellation (ANC) of a feedforward method is known in which road noise generated by friction and impact between a tire and a road surface is acquired from a reference sensor, and a cancellation sound is generated from a speaker to cancel the noise. Patent Document 1 discloses a noise cancellation signal generation device that improves noise reduction performance by generating a noise cancellation signal using a transfer function considering the change in the relative position between the speaker and the noise cancellation point. ]>

[0004] In addition to the above-described road noise, the noise inside the vehicle cabin generated during driving includes, for example, vibration noise generated by vibration of the vehicle body such as a windshield.

[0005] Japanese Patent Application Laid-Open No. 2022-59096

[0006] In vibration noise cancellation (vibration NC) for suppressing vibration noise, sufficient consideration has not been given to how to arrange an acceleration sensor for detecting vibration and an actuator provided for the object of vibration control.

[0007] The present disclosure has been made in view of such a situation, and is intended to realize suppression of vibration noise in a more suitable manner.

[0008] The vibration control system of this disclosure comprises one or more acceleration sensors provided on the vehicle body and which acquire vibration information by detecting vibrations, and one or more actuators provided on the control target portion of the vehicle body that is subject to vibration control and which are provided at vibration detection locations different from the control target portion, and which control the vibration of the control target portion in accordance with the vibration information from the acceleration sensors.

[0009] In this disclosure, one or more acceleration sensors are provided on the vehicle body to detect vibrations and acquire vibration information, and one or more actuators are provided on the control target portion of the vehicle body that is subject to vibration control, and the vibration of the control target portion is controlled according to the vibration information from the acceleration sensors provided at least at vibration detection locations different from the control target portion.

[0010] This is a diagram illustrating the causes of vibration noise and its suppression. This is a diagram illustrating an example of a typical arrangement of acceleration sensors and actuators. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating the basic principles of multi-panel control. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating an example of the arrangement of acceleration sensors and actuators according to this disclosure. This is a diagram illustrating an example of the arrangement of acceleration sensors. This is a diagram comparing measured acceleration data. This is a diagram illustrating an example of the arrangement of acceleration sensors. This is a diagram comparing measured acceleration data. This is a diagram comparing measured acceleration data. This is a diagram illustrating the correlation between double-layered panels. This is a diagram illustrating vibration control in a double-layered panel. This is a diagram illustrating latency in a double-layered panel.

[0011] The following describes the forms for implementing this disclosure (hereinafter referred to as embodiments). The explanation will be given in the following order.

[0012] 1. Causes of vibration noise and their suppression 2. Overview of the technology related to this disclosure 3. Arrangement of acceleration sensors and actuators in this disclosure 4. Correlation between device arrangement and panels in a vehicle 5. Double-layered panel and its vibration control 6. Others

[0013] <1. Causes and Suppression of Vibration Noise> In recent years, with the spread of EVs, the quietness inside the vehicle has improved, but at the same time, the need to suppress the noise inside the vehicle that occurs during driving has increased. In addition to road noise caused by friction and impact between the tires and the road surface, noise inside the vehicle that occurs during driving includes vibration noise caused by vibrations of the vehicle body, such as the windshield.

[0014] As shown in Figure 1A, vibration noise is generated when the panels P10 that make up the vehicle body vibrate due to noise and vibration from outside the vehicle, and that vibration is radiated as sound into the vehicle's interior.

[0015] In response to this, a control method that directly controls the vibration of panel P10 is being considered, as shown in Figure 1B. Specifically, this control method aims to reduce noise inside the vehicle by having an acceleration sensor 11 sense the vibration of panel P10, which is the source of noise, and by having an NC processing unit 12 directly control the vibration of panel P10 via an actuator 13 (also called an exciter).

[0016] In this control method, in order to directly control the noise-emitting panel P10, multiple acceleration sensors 11 and multiple actuators 13 are directly attached to the panel P10 that is the target of vibration control, as shown in Figure 2.

[0017] However, in vibration NC systems designed to suppress such vibration noise, sufficient consideration has not been given to how to arrange the acceleration sensors that detect vibrations and the actuators that are installed on the target of vibration control. For example, the panels that make up a vehicle body may include not only windshields and other window glass, but also the body, inner trim, and instrument panel. Considering their applications and available space, it is not always possible to place multiple acceleration sensors and multiple actuators on all of these panels.

[0018] <2. Overview of the Technology Related to This Disclosure> In the technology related to this disclosure, each panel, which is a plate-shaped component that makes up the vehicle body, becomes a controlled portion that is subject to vibration control in vibration NC, and also becomes a vibration detection point that detects vibration. The controlled portion and vibration detection points include window glass such as the windshield, roof glass, side glass, and rear glass, body such as doors, hood, and roof, inner trim, and instrument panel.

[0019] Furthermore, in the technology disclosed herein, the panel that is the part to be controlled and the panel that is the vibration detection point do not necessarily have to be the same panel. For example, acceleration sensors can be placed on multiple panels as vibration detection points, and the vibration of one panel can be controlled based on the vibration information acquired by the acceleration sensors. Alternatively, an acceleration sensor can be placed on one panel as the vibration detection point, and the vibrations of multiple panels can be controlled based on the vibration information acquired by that acceleration sensor.

[0020] In other words, in the technology disclosed herein, if there is a correlation between vibration noise radiated into the vehicle cabin and vibration at the vibration detection point, it is not a necessary condition to place an acceleration sensor on the panel that is the part to be controlled.

[0021] In the following, the control of the vibration of the panel to be controlled by an actuator provided on the panel to be controlled, in accordance with vibration information from an acceleration sensor provided on at least one panel different from the panel to be controlled, is also referred to as multi-panel control.

[0022] <3. Arrangement of acceleration sensors and actuators in this disclosure> A vibration control system applying the technology of this disclosure is configured to include one or more acceleration sensors provided on the vehicle body that acquire vibration information by detecting vibrations, and one or more actuators provided on the control target portion of the vehicle body that is subject to vibration control, and which control the vibration of the control target portion in accordance with the vibration information from acceleration sensors provided at least at vibration detection locations different from the control target portion.

[0023] The following describes the arrangement of acceleration sensors and actuators that realize multi-panel control in a vibration control system to which the technology described herein is applied.

[0024] (First example) Figure 3 shows an example of the arrangement of the acceleration sensor and actuator according to the present disclosure.

[0025] In the vibration control system 100 shown in Figure 3, multiple actuators 13 are provided on panel P10, which is the part to be controlled, and multiple acceleration sensors 11 are provided on panel P20, which is different from panel P10, as the vibration detection point. In other words, in the example of Figure 3, the part to be controlled and the vibration detection point are completely different panels. There may be only one actuator 13 on panel P10. Similarly, there may be only one acceleration sensor 11 on panel P20.

[0026] The acceleration sensor 11 acquires vibration information by detecting vibrations of panel P20. The acceleration sensor 11 is configured, for example, as a MEMS (Micro Electro Mechanical Systems) acceleration sensor. The acceleration sensor 11 acquires and outputs acceleration values ​​(acceleration data) as vibration information by detecting the rate of change of velocity such as "motion," "gravity," "vibration," and "shock" per unit time.

[0027] The NC processing unit 12 functions as a signal generation unit that generates a control signal to suppress vibrations of the panel P10 (the part to be controlled) based on the acceleration value output as vibration information by the acceleration sensor 11.

[0028] The actuator 13 then controls the vibration of the panel P10 (the part to be controlled) based on the control signal generated by the NC processing unit 12.

[0029] In the vibration control system 100, the NC processing unit 12 generates a control signal using vibration information from an acceleration sensor 11 installed on panel P20 (vibration detection point) where vibrations correlated with the vibration of panel P10 (control target portion) are detected. As shown in Figure 4, the control signal is generated using a transfer function D1 from panel P20 to panel P10 and a transfer function D2 from panel P10 to a noise cancellation point (for example, the ear position of user U), both of which have been measured in advance. The transfer function D2 is measured, for example, using a measurement microphone MC placed near the headrest HR of the seat. In other words, in the vibration control system 100, a feedback-type vibration NC is executed to control the vibration of panel P10 by detecting the vibration of panel P20.

[0030] In this way, even if the controlled portion and the vibration detection point are on completely different panels, it is possible to suppress vibration noise radiated into the vehicle cabin due to vibrations in the controlled portion.

[0031] Furthermore, if the panel to be controlled and the panel where vibration is detected are the same panel, howling is more likely to occur due to the close distance between the acceleration sensor 11 and the actuator 13. In contrast, in the technology disclosed herein, howling can be prevented by using different panels for the panel to be controlled and the panel where vibration is detected.

[0032] (Second example) Figure 5 shows another example of the arrangement of the acceleration sensor and actuator according to the present disclosure.

[0033] In the vibration control system 100A shown in Figure 5, multiple actuators 13 are provided on panel P10, which is the part to be controlled, and one or more acceleration sensors 11 are provided on panels P20 and P21, which are different from panel P10, as vibration detection points. In other words, in the example of Figure 5, there are multiple panels that serve as vibration detection points relative to the panel that is the part to be controlled.

[0034] In this case, in the vibration control system 100A, the NC processing unit 12 generates a control signal using vibration information from acceleration sensors 11 provided at two or more vibration detection locations (panels P20, P21).

[0035] In this way, even when there are multiple vibration detection points on the controlled part, vibration noise can be suppressed.

[0036] (Third example) Figure 6 shows yet another example of the arrangement of the acceleration sensor and actuator of the present disclosure.

[0037] In the vibration control system 100B shown in Figure 6, multiple actuators 13 are provided on panel P10, which is the part to be controlled, and one or more acceleration sensors 11 are provided on panels P20 and P21, which are different from panel P10, as vibration detection points. Furthermore, one or more acceleration sensors 11 are also provided on panel P10, which is the part to be controlled. In other words, in the example of Figure 6, acceleration sensors 11 are arranged on both the panel that is the part to be controlled and the panel that is the vibration detection point.

[0038] In this case, in the vibration control system 100B, the NC processing unit 12 generates a control signal by using vibration information from acceleration sensors 11 installed on the control target part (panel P10) in addition to vibration information from acceleration sensors 11 installed on the vibration detection points (panels P20, P21).

[0039] Thus, even when acceleration sensors 11 are placed on both the panel that is the part to be controlled and the panel that is the vibration detection point, vibration noise can be suppressed.

[0040] (Fourth Example) FIG. 7 is a diagram showing yet another example of the arrangement of the acceleration sensors and the actuators of the present disclosure.

[0041] In the vibration control system 100C shown in FIG. 7, a plurality of acceleration sensors 11 and a plurality of actuators 13 are provided on the panel P10, and a plurality of acceleration sensors 11 and a plurality of actuators 13 are also provided on the panel P20. That is, in the example of FIG. 6, each panel becomes a vibration detection location and a control target portion.

[0042] In this case, in the vibration control system 100C, the NC processing unit 12 uses the vibration information of the acceleration sensor 11 provided on the panel P20 as the vibration detection location to generate a control signal for suppressing the vibration of the panel P10 as the control target portion. At this time, a control signal may be generated to suppress the vibration of the panel P10 by further using the vibration information of the acceleration sensor 11 provided on the control target portion (panel P10).

[0043] Further, the NC processing unit 12 uses the vibration information of the acceleration sensor 11 provided on the panel P10 as the vibration detection location to generate a control signal for suppressing the vibration of the panel P20 as the control target portion. At this time, a control signal may be generated to suppress the vibration of the panel P20 by further using the vibration information of the acceleration sensor 11 provided on the control target portion (panel P20).

[0044] Thus, even when each panel is a vibration detection location and a control target portion, suppression of vibration noise can be achieved.

[0045] (Fifth Example) FIG. 8 is a diagram showing yet another example of the arrangement of the acceleration sensors and the actuators of the present disclosure.

[0046] In the vibration control system 100D shown in FIG. 8, a plurality of actuators 13 are provided on the panel P10 that is the control target portion, and one or more acceleration sensors 11 are provided with different cross members M30 and axles D31 from the panel P10 as vibration detection locations. Not limited to this, in the example of FIG. 8, the vicinity of the vehicle tire W32 may be included in the vibration detection location. That is, in the example of FIG. 8, the acceleration sensor 11 is arranged at a location other than the above-described panel. Usually, the acceleration sensor 11 arranged at such a location is used for load noise cancellation (RNC). In the vibration control system 100D, vibration NC of the feedforward method using the acceleration sensor 11 provided on the cross member M30 and the axle D31 is executed.

[0047] In this case, in the vibration control system 100D, the NC processing unit 12 generates a control signal using the vibration information of the acceleration sensor 11 provided on the cross member M30 and the axle D31 as the vibration detection location.

[0048] In this way, by using a configuration for suppressing load noise, vibration noise can also be suppressed.

[0049] (Sixth example) FIG. 9 is a diagram showing still another example of the arrangement of the acceleration sensor and the actuator of the present disclosure.

[0050] In the vibration control system 100E shown in FIG. 9, a plurality of actuators 13 are provided on the panel P10 that is the control target portion, and one or more acceleration sensors 11 are provided with different panels P20, cross members M30, and axles D31 from the panel P10 as vibration detection locations. In the example of FIG. 9, the acceleration sensor 11 is arranged at each vibration detection location that vibrates at a different frequency.

[0051] In this case, in the vibration control system 100E, the NC processing unit 12 generates a control signal using vibration information from acceleration sensors 11 installed at different vibration detection locations (panel P20, cross member M30, and axle D31) for each vibration control band of the part to be controlled. For example, to control vibrations of 200 to 500 Hz, a control signal is generated using vibration information from acceleration sensors 11 installed on the cross member M30 and axle D31, which are correlated with that frequency band. Also, to control vibrations of about 50 to 200 Hz, a control signal is generated using vibration information from acceleration sensor 11 installed on panel P20, which is correlated with that frequency band. In the vibration control system 100E, a feedback-type vibration NC using the acceleration sensor 11 installed on panel P20 and a feedforward-type vibration NC using the acceleration sensor 11 installed on the cross member M30 and axle D31 are executed together.

[0052] In this way, vibration noise can be suppressed according to the frequency band of the vibration to be controlled.

[0053] <4. Device placement in the vehicle and correlation between panels> (Device placement in the vehicle) Referring to Figure 10, the parts of the vehicle where each device, such as the acceleration sensor 11 and the actuator 13, is placed will be described.

[0054] The vehicle 200 shown in Figure 10 includes, as described above, a windshield 211, left and right front door windows 221L, 221R, left and right rear door windows 222L, 222R, left and right quarter windows 231L, 231R, front roof window 241, and rear roof window 242, as well as an instrument panel 251.

[0055] These panels serve as the controlled parts subject to vibration control in the vibration NC, and also as vibration detection points for detecting vibrations. Specifically, when these panels are the controlled parts, actuators 13 are provided on them, and when these panels are vibration detection points, acceleration sensors 11 are provided on them.

[0056] However, if the controlled part or vibration detection location is a window glass, the actuator 13 and acceleration sensor 11 are installed in a position on the window glass that is not visible from inside the vehicle 200.

[0057] For example, if the part to be controlled or the vibration detection point is the windshield 211, the actuator 13 and acceleration sensor 11 are installed in the windshield 211 in areas such as IP1 along the roof and IP2 along the hood, as shown in Figure 11.

[0058] Furthermore, devices such as the acceleration sensor 11 and actuator 13 may be placed not only in the areas described with reference to Figure 11, but also in the body such as the doors, hood, and roof, as well as in the interior trim such as the interior lining of the passenger compartment, and on the passenger compartment side of the pillars.

[0059] (Correlation between panels) The technology described herein can achieve its effect by having a correlation between the vibration of the panel where vibration detection takes place and the vibration of the panel where the controlled portion is located. In other words, it is sufficient that there is a correlation between the vibration information (acceleration values) of each acceleration sensor 11 located on different panels in the vehicle 200.

[0060] Therefore, as described below, the applicant measured the acceleration values ​​of acceleration sensors 11 located on different panels in the vehicle 200 and compared them.

[0061] For example, as shown in Figure 12, in the vehicle 200, 17 channels of acceleration sensors 11 (hereinafter referred to as acceleration sensors 11-17, etc.) are placed on the right rear door glass 222R, and acceleration sensor 11-24 is placed on the left quarter glass 231L. Then, noise (vibration) of 20 to 500 Hz is applied from outside the vehicle 200, and the acceleration values ​​of acceleration sensors 11-17 and 11-24 are measured.

[0062] Figure 13 is a diagram comparing the measured acceleration values ​​from acceleration sensors 11-17 and 11-24.

[0063] As shown in Figure 13, similar measured data was obtained for noise in the range of 20 to approximately 400 Hz, particularly for acceleration sensors 11-17 (solid line) and 11-24 (dashed line). In other words, a correlation was confirmed between the right rear door glass 222R and the left quarter glass 231L.

[0064] Furthermore, as shown in Figure 14, in the vehicle 200, four acceleration sensors 11-1 to 11-4 are placed above the windshield 211, and acceleration sensors 11-11 and 11-14 are placed on the front right and rear left sides of the front roof glass 241, respectively. Then, noise (vibration) of 20 to 500 Hz is applied from outside the vehicle 200, and the acceleration values ​​of each of the acceleration sensors 11-1 to 11-4, 11-11, and 11-14 are measured.

[0065] Figure 15 is a diagram comparing the measured acceleration values ​​of each of the acceleration sensors 11-1 to 11-4.

[0066] As shown in Figure 15, similar measured data (solid lines) were obtained for noise levels from 20 to 500 Hz for each of the acceleration sensors 11-1 to 11-4. This is natural, as each of the acceleration sensors 11-1 to 11-4 is located on the same panel (windshield 211).

[0067] Figure 16 is a diagram comparing the measured acceleration values ​​of acceleration sensors 11-1 to 11-4, 11-11, and 11-14.

[0068] As shown in Figure 16, the acceleration values ​​of acceleration sensors 11-1 to 11-4 (solid lines), acceleration value of acceleration sensor 11-11 (dotted line), and acceleration value of acceleration sensor 11-14 (dashed line), as explained with reference to Figure 15, show that similar measured data was obtained, particularly for noise between 20 and 260 Hz. In other words, a correlation was confirmed between the windshield 211 and the front roof glass 241.

[0069] Thus, if it is found that there is a correlation between different panels in the vehicle 200, the vibration control system of this disclosure makes it possible to control the vibration of one panel in accordance with the vibration information of the other panel.

[0070] <5. Double-layered panels and their vibration control> Above, we have described an example of vibration control (multi-panel control) when there is only one panel separating the exterior and interior of the vehicle. However, it is not always the case that there is only one panel separating the exterior and interior of the vehicle.

[0071] For example, as shown in Figure 17A, if the exterior of a vehicle and the interior of the vehicle are separated only by panel P10, the vibration of panel P10 can be controlled using vibration information from other panels whose vibrations are correlated with the vibration of panel P10.

[0072] In contrast, as shown in Figure 17B, suppose the exterior and interior of the vehicle are separated by two panels P10 and P20. For example, suppose panel P10 is the interior trim on the interior side and panel P20 is the exterior body of the vehicle. In this case, the vibration of panel P10 is controlled by providing an acceleration sensor 11 on panel P20 as a vibration detection point and an actuator 13 on panel P10 as a vibration control target. However, the vibration of panel P20 may also be controlled by providing an acceleration sensor 11 on panel P10 as a vibration detection point and an actuator 13 on panel P20 as a vibration control target.

[0073] However, in the case of a double structure as shown in Figure B, since panel P10 (inner trim) and panel P20 (body) are coupled, external noise (vibration) is attenuated and transmitted, which may cause the correlation between the panels to be unstable.

[0074] Therefore, as shown in Figure 18, acceleration sensors 11 are provided on both panel P10 (e.g., the controlled portion) and panel P20 (e.g., the vibration detection location). In the example in Figure 18, actuators 13 are also provided on both panel P10 and panel P20. The NC processing unit 12 determines the degree of correlation between the panels based on the vibration information (acceleration values) from the acceleration sensors 11 provided on each of the panels P10 and P20. The NC processing unit 12 then generates a corrected control signal according to the determined degree of correlation.

[0075] This configuration makes it possible to appropriately control the vibrations of both panel P10 and panel P20.

[0076] As shown in Figure 19, in a double-layered panel, latency occurs between noise N1 from outside the vehicle and noise N2 that propagates into the vehicle interior where the user U is located. The following steps A to D are taken before noise N1 from outside the vehicle propagates into the vehicle interior as noise N2.

[0077] A. Panel P20 (body) vibrates due to noise N1 from outside the vehicle. B. The vibration of panel P20 is attenuated by the vehicle body's coupling structure. C. Panel P10 (inner trim) vibrates due to the vibration of panel P20. D. Noise N2 is transmitted into the vehicle interior due to the vibration of panel P10.

[0078] If latency increases during processes A through D, it may affect the vibration control bandwidth of the vibration NC. To address this, the following latency countermeasures can be taken.

[0079] First, the transfer functions of panel P20 (body) and panel P10 (inner trim) are measured in advance.

[0080] Next, panel P20 is designated as the vibration detection point and panel P10 as the control target part. An acceleration sensor 11 is provided on panel P20, and an actuator 13 is provided on panel P10.

[0081] Then, the NC processing unit 12 controls the vibration of panel P10 by adjusting the filter coefficient of the adaptive filter for generating a control signal using the vibration information (acceleration value) detected in panel P20.

[0082] As described above, latency can be suppressed by the hardware configuration.

[0083] <6. Others> In this specification, a system means a collection of multiple components (devices, modules (parts), etc.), regardless of whether all components are located in the same enclosure or not. Therefore, multiple devices housed in separate enclosures and connected via a network, and a single device in which multiple modules are housed in one enclosure, are both considered systems.

[0084] The effects described herein are illustrative and not limited to those described herein, and other effects may also occur.

[0085] The embodiments of this disclosure are not limited to those described above, and various modifications are possible without departing from the spirit of this disclosure.

[0086] Furthermore, the technology relating to this disclosure can take the following configurations: (1) A vibration control system comprising: one or more acceleration sensors provided on the body of a vehicle and acquiring vibration information by detecting vibration; and one or more actuators provided on a control target portion of the vehicle body that is subject to vibration control, and which control the vibration of the control target portion in accordance with the vibration information of the acceleration sensors provided at least at vibration detection locations different from the control target portion. (2) The vibration control system according to (1), further comprising a signal generation unit that generates a control signal for suppressing the vibration of the control target portion based on the vibration information of the acceleration sensors, wherein the actuator controls the vibration of the control target portion based on the control signal. (3) The vibration control system according to (2), wherein the signal generation unit generates the control signal using the vibration information of the acceleration sensors provided at vibration detection locations where vibrations correlated with the vibration of the control target portion are detected. (4) The vibration control system according to (3), wherein the signal generation unit generates the control signal using the vibration information of the acceleration sensors provided at two or more vibration detection locations. (5) The vibration control system according to (3), wherein the signal generation unit generates the control signal using the vibration information from the acceleration sensor provided at the vibration detection location, in addition to the vibration information from the acceleration sensor provided at the controlled portion. (6) The vibration control system according to (3), wherein the signal generation unit generates the control signal using the vibration information from the acceleration sensor provided at different vibration detection locations for each vibration control band of the controlled portion. (7) The vibration control system according to any one of (1) to (6), wherein the controlled portion includes at least one of the window glass, body, inner trim, and instrument panel that constitute the vehicle body. (8) The vibration control system according to (7), wherein, if the controlled portion is the window glass, the actuator is provided at a position on the window glass that is not visible from inside the vehicle.(9) The vibration control system according to (7) or (8), wherein the vibration detection location includes at least one of the window glass, the body, the inner trim, and the instrument panel, which is different from the controlled portion. (10) The vibration control system according to (9), wherein if the vibration detection location is the window glass, the acceleration sensor is provided in the window glass at a position that is not visible from inside the vehicle. (11) The vibration control system according to any one of (7) to (10), wherein the vibration detection location includes the vicinity of the vehicle's tires. (12) The vibration control system according to any one of (3) to (11), wherein the signal generation unit determines the degree of correlation based on the vibration information from the acceleration sensors provided in the controlled portion and the vibration detection location, respectively. (13) The vibration control system according to (12), wherein the signal generation unit generates the control signal corrected according to the degree of correlation.

[0087] 11 Acceleration sensor, 12 NC processing unit, 13 Actuator, 100 Vibration control system, 200 Vehicle, P10, P20 Panel

Claims

1. A vibration control system comprising: one or more acceleration sensors provided on the vehicle body to acquire vibration information by detecting vibrations; and one or more actuators provided on the control target portion of the vehicle body that is subject to vibration control, and which are provided at vibration detection locations different from the control target portion, to control the vibration of the control target portion in accordance with the vibration information from the acceleration sensors.

2. The vibration control system according to claim 1, further comprising a signal generation unit that generates a control signal for suppressing vibration of the controlled portion based on the vibration information of the acceleration sensor, wherein the actuator controls the vibration of the controlled portion based on the control signal.

3. The vibration control system according to claim 2, wherein the signal generation unit generates the control signal using the vibration information from the acceleration sensor provided at the vibration detection location where vibrations correlated with the vibration of the controlled portion are detected.

4. The vibration control system according to claim 3, wherein the signal generation unit generates the control signal using the vibration information from the acceleration sensors provided at two or more vibration detection locations.

5. The vibration control system according to claim 3, wherein the signal generation unit generates the control signal by further using the vibration information from the acceleration sensor provided at the vibration detection location, as well as the vibration information from the acceleration sensor provided at the control target portion.

6. The vibration control system according to claim 3, wherein the signal generation unit generates the control signal using the vibration information from the acceleration sensors provided at different vibration detection locations for each vibration control band of the controlled portion.

7. The vibration control system according to claim 1, wherein the controlled portion includes at least one of the window glass, body, inner trim, and instrument panel that constitute the vehicle body.

8. The vibration control system according to claim 7, wherein, if the portion to be controlled is the window glass, the actuator is provided in the window glass at a position that is not visible from inside the vehicle.

9. The vibration control system according to claim 7, wherein the vibration detection location includes at least one of the window glass, the body, the inner trim, and the instrument panel, which are different from the portion to be controlled.

10. The vibration control system according to claim 9, wherein, if the vibration detection location is the window glass, the acceleration sensor is provided on the window glass at a position that is not visible from inside the vehicle.

11. The vibration control system according to claim 7, wherein the vibration detection location includes the vicinity of the vehicle's tires.

12. The vibration control system according to claim 3, wherein the signal generation unit determines the degree of correlation based on the vibration information from the acceleration sensors provided at the controlled portion and the vibration detection location, respectively.

13. The vibration control system according to claim 12, wherein the signal generation unit generates the control signal corrected according to the degree of correlation.

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