US 5,544,080 AGranted

Vibration/noise control system

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsToshiaki Kobayashi, Hidetaka Ozawa

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Abstract

A sine wave signal generated in synchronism with a pulse signal determining a frequency of vibrations and noises generated by a vibration/noise source is input to a W filter and a C filter. The C filter selects filter coefficients dependent on the rotational speed of an engine, and generates a transfer characteristic-dependent reference signal R dependent on a transfer characteristic of a vibration/noise-transmitting path, based on the filter coefficients. Alternatively, a divisional signal is prepared by dividing a repetition period of vibrations and noises by a predetermined number, and values of a sine wave generated in synchronism with occurrence of said divisional signal is delivered to a W filter, while the transfer characteristic-dependent reference signal is delivered from the C filter storing data of the transfer characteristic identified in advance to the W filter. Alternatively, a sine wave signal and a delayed sine wave signal delayed by a quarter of a repetition period of the sine wave relative to the sine wave, as well as phase and amplitude-related information of the transfer characteristic of the path are generated and delivered in synchronism with generation of the divisional signal. These sine wave signals and the transfer characteristic-dependent reference signal (phase and amplitude-related information) are used to actively control the vibrations and noises.

Claims16

Dependent claims

In a vibration/noise control system for controlling vibrations and noises generated from a vibration/noise source, with a periodicity or a quasi-periodicity, said vibration/noise source having at least a rotational member, including first filter means for generating a control signal for control of said vibrations and noises, a driving signal-forming means for converting said control signal into a driving signal to be delivered to a vibration/noise-transmitting path through which said vibrations and noises are transmitted, error signal-forming means for generating an error signal indicative of a difference between said driving signal transmitted through said vibration/noise-transmitting path and a vibration/noise signal indicative of said vibrations and noises generated from said vibration/noise source, second filter means for generating a transfer characteristic-dependent reference signal reflecting a transfer characteristic of said vibration/noise-transmitting path, and control signal-updating means for updating filter coefficients of said first filter means based on said error signal output from said error signal-forming means, said transfer characteristic-dependent reference signal output from said second filter means, and said filter coefficients of said first filter means, such that said error signal becomes the minimum,

the improvement comprising:
pulse signal-generating means for detecting rotation of said rotational member whenever said rotational member rotates through each predetermined very small degree, and generating a pulse signal indicative of detected rotation;
and
reference signal-forming means for forming a reference signal corresponding to a repetition period of vibrations and noises peculiar to a component part of said vibration/noise source, based on an interval of occurrences of pulses of said pulse signal generated by said pulse signal-generating means, and delivering said reference signal to said first filter means;
wherein said reference signal-forming means has sine wave-forming means for forming a sine wave having a single repetition period per said repetition period of said vibrations and noises peculiar to said component part of said vibration/noise source, and
wherein said second filter means has:
correction value-selecting means for selecting a correction value representative of said transfer characteristic according to a rotational speed of said rotational member, and
transfer characteristic-dependent reference signal-forming means for correcting said reference signal based on said correction value selected by said correction value-selecting means, into said transfer characteristic-dependent reference signal.

5 more elements

In a vibration/noise control system for controlling vibrations and noises generated from a vibration/noise source, with a periodicity or a quasi-periodicity, said vibration/noise source having at least a rotational member, including first filter means having an adaptive digital filter for generating a control signal for control of said vibrations and noises, a driving signal-forming means for converting said control signal into a driving signal to be delivered to a vibration/noise-transmitting path through which said vibrations and noises are transmitted, error signal-forming means for generating an error signal indicative of a difference between said driving signal transmitted through said vibration/noise-transmitting path and a vibration/noise signal indicative of said vibrations and noises generated from said vibration/noise source, second filter means for generating a transfer characteristic-dependent signal reflecting a transfer characteristic of said vibration/noise-transmitting path, and control signal-updating means for updating filter coefficients of said first filter means based on said error signal output from said error signal-forming means, said transfer characteristic-dependent reference signal output from said second filter means, and said filter coefficients of said first filter means, such that said error signal becomes the minimum,

the improvement comprising:
driving repetition period signal-generating means for generating a driving repetition period signal corresponding to a repetition period of vibrations and noises peculiar to a component part of said vibration/noise source, whenever said rotational member rotates through a predetermined rotational angle;
divisional signal-generating means for generating a plurality of pulses of a divisional signal during a repetition period of said driving repetition period signal generated by said driving repetition period signal-generating means;
and
reference signal generating means for generating a reference signal formed of a sine wave having a single repetition period per said repetition period of vibrations and noises according to timing of inputting of said divisional signal generated by said divisional signal generating means;
wherein said adaptive digital filter of said first filter means has two taps;
and
the number N of said plurality of pulses of said divisional signal generated by said divisional signal-generating means per said repetition period of said driving repetition period signal is within a range of 3.ltoreq.N.ltoreq.7, where N is a real number.

5 more elements

In a vibration/noise control system for controlling vibrations and noises generated from a vibration/noise source, with a periodicity or a quasi-periodicity, said vibration/noise source having at least a rotational member, including first filter means having an adaptive digital filter for generating a control signal for control of said vibrations and noises, a driving signal-forming means for converting said control signal into a driving signal to be delivered to a vibration/noise-transmitting path through which said vibrations and noises are transmitted, error signal-forming means for generating an error signal indicative of a difference between said driving signal transmitted through said vibration/noise-transmitting path and a vibration/noise signal indicative of said vibrations and noises generated from said vibration/noise source, second filter means for generating a transfer characteristic-dependent reference signal reflecting a transfer characteristic of said vibration/noise-transmitting path, and control signal-updating means for updating filter coefficients of said first filter means based on said error signal output from said error signal-forming means, said transfer characteristic-dependent reference signal output from said second filter means, and said filter coefficients of said first filter means, such that said error signal becomes the minimum,

the improvement comprising:
driving repetition period signal-generating means for generating a driving repetition period signal corresponding to a repetition period of vibrations and noises peculiar to a component part of said vibration/noise source, whenever said rotational member rotates through a predetermined rotational angle;
divisional signal-generating means for generating a large number of pulses of a divisional signal during each repetition period of said driving repetition period signal generated by said driving repetition period signal generating means whenever said rotational member rotates through each very small rotational angle;
and
reference signal-storing means for storing a reference signal dependent on timing of occurrence of pulses of said divisional signal, said reference signal being delivered to said first filter means;
wherein said adaptive digital filter of said first filter means has two taps;
and
wherein said reference signal storing means has sine wave storing means for storing a single repetition period of a sine wave corresponding to said repetition period of said vibrations and noises generated from said vibration/noise source, and delayed signal storing means for storing a delayed sine wave signal delayed by a predetermined delay ratio M relative to said repetition period of said sine wave signal,
said predetermined delay ratio M is within a range of 1/3.gtoreq.M.gtoreq.1/7, where M is a real number.

6 more elements

Dependencies are inferred from the claim text.