Active exhaust-noise attenuation muffler

Details Active exhaust-noise attenuation muffler Active exhaust-noise attenuation muffler

1994-08-09

1996-11-12

Dang, Khanh

Acoustics

Sound-modifying means

By wave interference

181228, 381 71, F01N 106

Patent

active

055742645

ABSTRACT:
An electronically controlled active exhaust-noise attenuation muffler, comprises a loudspeaker serving as a secondary sound source arranged upstream of a tailpipe and communicating with an interior of an exhaust pipe, for attenuating a noise level of exhaust noise produced by the exhaust system by emitting a secondary sound, which is in opposite phase to the exhaust noise, into the exhaust pipe. The tailpipe is formed in a flared-out fashion so that a cross-sectional area of the tailpipe gradually increases towards a downstream end thereof, to reduce pressure loss in exhaust gas flow in the exhaust pipe by radiating the exhaust gas through the flared-out tailpipe. The tailpipe section is a high-frequency exhaust noise attenuation structure to attenuate a high-frequency noise component propagated with a moving stream of the exhaust gases.

REFERENCES:
patent: 2929462 (1960-03-01), Nowak
patent: 3786791 (1974-01-01), Richardson
patent: 4444288 (1984-04-01), Sekiya et al.
patent: 4665549 (1987-05-01), Eriksson et al.
patent: 5119902 (1992-06-01), Geddes
patent: 5272286 (1993-12-01), Cain et al.
patent: 5371331 (1994-12-01), Wall

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