VIBRATION DAMPING DEVICE AND VEHICLE PROVIDED WITH THE VIBRATION DAMPING DEVICE
First Claim
1. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device comprising:
- a calculator including an adaptive control algorithm that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position;
a vibration applying actuator that generates the canceling vibration at the position based on the pseudo vibration;
a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the adaptive control algorithm is adapted by learning to reduce the remaining vibration;
a frequency recognizer that recognizes a frequency of the vibration at the position based on a signal related to the vibration caused by the vibration generating source, the frequency of the vibration at the position serving as a basis to determine a frequency of the pseudo vibration;
a phase difference identifier that detects the remaining vibration, identifies a phase of the remaining vibration, and identifies a phase difference between the phase of the remaining vibration and a phase of the canceling vibration generated at the position based on the pseudo vibration; and
a frequency corrector that corrects, based on the phase difference, the frequency of the vibration recognized by the frequency recognizer in a direction of eliminating the phase difference.
1 Assignment
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Accused Products
Abstract
A damping device includes a calculator calculating a pseudo vibration to cancel a source vibration transmitted from a vibration source to a position to be damped, using an adaptive control algorithm. The canceling vibration is generated according to the pseudo vibration. A vibration detector detects an error vibration remaining at the position. The adaptive control algorithm is adapted by learning to reduce the error vibration. A frequency recognizer recognizes a frequency of the source vibration from a signal related to the vibration source. The frequency of the vibration is used to determine a frequency of the pseudo vibration. A phase difference identifier identifies a phase difference between the error vibration and the canceling vibration according to the pseudo vibration, and a frequency corrector corrects, according to the phase difference, the frequency of the vibration to eliminate the phase difference.
67 Citations
16 Claims
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1. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device comprising:
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a calculator including an adaptive control algorithm that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a vibration applying actuator that generates the canceling vibration at the position based on the pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the adaptive control algorithm is adapted by learning to reduce the remaining vibration; a frequency recognizer that recognizes a frequency of the vibration at the position based on a signal related to the vibration caused by the vibration generating source, the frequency of the vibration at the position serving as a basis to determine a frequency of the pseudo vibration; a phase difference identifier that detects the remaining vibration, identifies a phase of the remaining vibration, and identifies a phase difference between the phase of the remaining vibration and a phase of the canceling vibration generated at the position based on the pseudo vibration; and a frequency corrector that corrects, based on the phase difference, the frequency of the vibration recognized by the frequency recognizer in a direction of eliminating the phase difference. - View Dependent Claims (2, 3, 4, 5)
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6. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device comprising:
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a controller that receives frequency information corresponding to the vibration and generates a canceling signal for canceling the vibration transmitted from the vibration generating source to the position; a vibration applying actuator that generates, based on the canceling signal, the canceling vibration to be transmitted to the position; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, the controller generating the canceling signal based on the remaining vibration detected by the vibration detector to reduce the remaining vibration at the position; a memory that stores transmission characteristics corresponding to a vibration transmission path from the vibration applying actuator to the position, the transmission characteristics indicating sensitivity information in association with frequency of the canceling vibration; and a sensitivity determiner that determines, based on the sensitivity information, whether a present frequency of the canceling vibration is in a low sensitivity region in which the canceling vibration is not substantially transmitted on the vibration transmission path, wherein when the sensitivity determiner determines that the present frequency of the canceling vibration is in the low sensitivity region, the controller corrects the canceling signal in a direction of suppressing the canceling vibration generated by the vibration applying actuator. - View Dependent Claims (7, 8, 9)
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10. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device comprising:
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a pseudo vibration calculator including an adaptive filter that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a canceling vibration generator that generates the canceling vibration at the position based on the pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the pseudo vibration calculator repeats calculation of the adaptive filter to reduce the remaining vibration based on the remaining vibration detected by the vibration detector and a convergence coefficient for determining a speed of convergence of the adaptive filter to a true value, and the pseudo vibration calculator converges the pseudo vibration and the adaptive filter to the true value by repeating calculations of the adaptive filter; a deviation information obtainer that obtains deviation information corresponding to a deviation between the vibration transmitted from the vibration generating source to the position and the canceling vibration generated at the position based on the pseudo vibration; and a convergence coefficient changer that changes, based on the deviation information, the convergence coefficient to increase the speed of convergence of the adaptive filter as the deviation is increased. - View Dependent Claims (13)
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11. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device comprising:
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a pseudo vibration calculator including an adaptive filter that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a canceling vibration generator that generates the canceling vibration at the position based on the pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the pseudo vibration calculator repeats calculation of the adaptive filter to reduce the remaining vibration based on the remaining vibration detected by the vibration detector and a convergence coefficient for determining a speed of convergence of the adaptive filter to a true value, and the pseudo vibration calculator converges the pseudo vibration and the adaptive filter to the true value by repeating calculations of the adaptive filter; a deviation information obtainer that obtains deviation information corresponding to a deviation between the vibration transmitted from the vibration generating source to the position and the canceling vibration generated at the position based on the pseudo vibration; and a convergence coefficient changer that changes, based on the deviation information, the convergence coefficient to decrease the speed of convergence of the adaptive filter as the deviation is decreased.
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12. A vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling, the vibration damping device comprising:
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a pseudo vibration calculator including an adaptive filter that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a canceling vibration generator that generates the canceling vibration at the position based on the pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the pseudo vibration calculator repeats calculation of the adaptive filter to reduce the remaining vibration based on the remaining vibration detected by the vibration detector and a convergence coefficient for determining a speed of convergence of the adaptive filter to a true value, and the pseudo vibration calculator converges the pseudo vibration and the adaptive filter to the true value by repeating calculations of the adaptive filter; a deviation information obtainer that obtains deviation information corresponding to a deviation between the vibration transmitted from the vibration generating source to the position and the canceling vibration generated at the position based on the pseudo vibration; and a convergence coefficient changer that changes, based on the deviation information, the convergence coefficient to increase the speed of convergence of the adaptive filter as the deviation is increased and to decrease the speed of convergence of the adaptive filter as the deviation is decreased.
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14. A vehicle comprising:
a vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device including; a calculator including an adaptive control algorithm that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a vibration applying actuator that generates the canceling vibration at the position based on the calculated pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, the adaptive control algorithm adapted by learning to reduce the remaining vibration; a frequency recognizer that recognizes a frequency of the vibration at the position based on a signal corresponding to the vibration caused by the vibration generating source, the frequency of the vibration at the position serving as a basis to determine a frequency of the pseudo vibration; a phase difference identifier that detects the remaining vibration, identifies a phase of the remaining vibration, and identifies a phase difference between the phase of the remaining vibration and a phase of the canceling vibration generated at the position based on the pseudo vibration; and a frequency corrector that corrects, in accordance with the phase difference, the frequency of the vibration recognized by the frequency recognizer in a direction of eliminating the phase difference.
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15. A vehicle comprising:
a vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device including; a controller that receives frequency information corresponding to the vibration and generates a canceling signal for canceling the vibration transmitted from the vibration generating source to the position; a vibration applying actuator that generates, based on the canceling signal, the canceling vibration to be transmitted to the position; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, the controller generating the canceling signal based on the remaining vibration detected by the vibration detector to reduce the remaining vibration at the position; a memory that stores transmission characteristics corresponding to a vibration transmission path from the vibration applying actuator to the position, the transmission characteristics indicating sensitivity information in association with frequency of the canceling vibration; and a sensitivity determiner that determines, based on the sensitivity information, whether a present frequency of the canceling vibration is in a low sensitivity region in which the canceling vibration is not substantially transmitted on the vibration transmission path, wherein when the sensitivity determiner determines that the present frequency of the canceling vibration is in the low sensitivity region, the controller corrects the canceling signal in a direction of suppressing the canceling vibration generated by the vibration applying actuator.
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16. A vehicle comprising:
a vibration damping device for canceling out, at a position to be damped, a vibration caused by a vibration generating source with a canceling vibration, the vibration damping device including; a pseudo vibration calculator including an adaptive filter that calculates a pseudo vibration to cancel the vibration transmitted from the vibration generating source to the position; a canceling vibration generator that generates the canceling vibration at the position based on the pseudo vibration; a vibration detector that detects a remaining vibration remaining as a cancellation error at the position, wherein the pseudo vibration calculator repeats calculation of the adaptive filter to reduce the remaining vibration based on the remaining vibration detected by the vibration detector and a convergence coefficient for determining a speed of convergence of the adaptive filter to a true value, and the pseudo vibration calculator converges the pseudo vibration and the adaptive filter to the true value by repeating calculations of the adaptive filter; a deviation information obtainer that obtains deviation information corresponding to a deviation between the vibration transmitted from the vibration generating source to the position and the canceling vibration generated at the position based on the pseudo vibration; and a convergence coefficient changer that changes, based on the deviation information, the convergence coefficient to increase the speed of convergence of the adaptive filter as the deviation is increased.
Specification