초록 ▼

A vibration/noise control system controls vibrations and noises generated with a periodicity or a quasi-periodicity from a vibration/noise source having at least a rotating member. A self-expanding engine mount is arranged in at least one of vibration/noise transmission paths and is driven by a driv

A vibration/noise control system controls vibrations and noises generated with a periodicity or a quasi-periodicity from a vibration/noise source having at least a rotating member. A self-expanding engine mount is arranged in at least one of vibration/noise transmission paths and is driven by a driving signal generated by the system. A vibration error sensor detects an error signal exhibiting a difference between the driving signal and the vibrations and noises. A reference sine wave is generated, which is superposed on a control signal for controlling the vibration/noise source, to thereby drive the self-expanding engine mount. A transfer characteristic of a portion of at least one of the vibration/noise transmission paths is identified based on the reference sine wave, a delayed sine wave delayed by a predetermined delay period M relative to the reference sine wave, and the error signal. The transfer characteristic stored is updated based on an identification signal output from an identifying filter formed by an adaptive digital filter having two taps. The predetermined delay period M is set relative to the repetition period of the reference sine wave in a range of 1/3≥M≥1/7, wherein M is a real number.

대표청구항 ▼

A vibration/noise control system for controlling vibrations and noises generated with a periodicity or a quasi-periodicity from a vibration/noise source having at least one rotating member, comprising: timing pulse signal-detecting means for detecting at least one timing pulse signal exhibiting a pe

A vibration/noise control system for controlling vibrations and noises generated with a periodicity or a quasi-periodicity from a vibration/noise source having at least one rotating member, comprising: timing pulse signal-detecting means for detecting at least one timing pulse signal exhibiting a period of vibrations and noises peculiar to at least one component part of said vibration/noise source; control signal-generating means for generating a control signal for controlling said vibration/noise source; electromechanical transducer arranged in at least one of a plurality of vibration/noise transmission paths through which said vibrations and noises from said vibration/noise source transmit; driving signal-generating means for generating a driving signal for driving said electromechanical transducer; error signal-detecting means for detecting an error signal exhibiting a difference between said driving signal and said vibrations and noises from said vibration/noise source; reference signal-generating means for storing a transfer characteristic of a portion of said at least one vibration/noise transmission path extending between said control signal-generating means and said error signal-detecting means, and for generating a reference signal based on said transfer characteristic and said timing pulse signal; control signal-updating means for updating said control signal such that said error signal is minimized, based on said error signal, said reference signal and said control signal; reference sine wave-generating means for generating a reference sine wave superposed on said control signal for driving said electromechanical transducer; delayed sine wave-generating means for generating a delayed sine wave which is delayed by a predetermined delay period M relative to said reference sine wave; transfer characteristic-identifying means for identifying said transfer characteristic of said portion of said at least one vibration/noise transmission path, based on said reference sine wave, said delayed sine wave, and said error signal, and for outputting a first identification signal indicative of completion of identification of said transfer characteristic; and transfer characteristic-updating means for updating said transfer characteristic stored in said reference signal-generating means, based on said first identification signal output from said transfer characteristic-identifying means; wherein said transfer characteristic-identifying means is formed of an adaptive digital filter having two taps; said predetermined delay period M is set relative to a repetition period of said reference sine wave in a range of 1/3≥M≥1/7, wherein M is a real number.