Active muffler with dynamic tuning

Details Active muffler with dynamic tuning Active muffler with dynamic tuning

1990-05-04

1991-10-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

181206, G10K 1116

Patent

active

050602713

ABSTRACT:
A method and apparatus for muffling motor vehicle engine noise comprises conventional noise attenuation apparatus and techniques as well as a tuning circuit for delivering separate signal outputs to at least two transducers separated along the length of the exhaust conduit. A spacing between the transducers corresponds to the range of tuned exhaust lengths required at various engine speeds within the operating range of the motor vehicle engine. The tuning circuit varies the strength of the signal delivered to each of the transducers to vary the cancellation point within the conduit so as to vary the effective length of the conduit in a manner that maintains a minimum or negative pressure pulse at the valve exhaust port and aids in the exhaustion of combustion gases from the cylinder. As a result, engine performance is improved throughout the operating range of the motor vehicle engine.

REFERENCES:
patent: 4153815 (1979-05-01), Chaplin et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4480333 (1984-10-01), Ross
patent: 4669122 (1987-05-01), Swinbanks
patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
patent: 4736431 (1988-04-01), Allie et al.
patent: 4783817 (1988-11-01), Hamada et al.
patent: 4805733 (1989-02-01), Kato et al.
patent: 4815139 (1989-03-01), Eriksson et al.
patent: 4837834 (1989-06-01), Allie
patent: 4876722 (1989-10-01), Dekker et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.

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