EP 0657630 B1 19961002 - Arrangement for active silencing
Title (en)
Arrangement for active silencing
Title (de)
Anordnung zur aktiven Schalldämpfung
Title (fr)
Arrangement d'atténuation active de son
Publication
Application
Priority
DE 4342133 A 19931210
Abstract (en)
[origin: EP0657630A1] According to the prior art, it is known to damp noise emissions by means of "antisound". In exhaust gas systems of internal combustion engines this is mostly implemented by subjecting the exhaust gas stream flowing past in the exhaust gas system with "antisound" emitted by loudspeakers (12). However, arrangements of this type have the disadvantage that the hot exhaust gases flowing past reduce the lifetime of the loudspeakers, or measures of this type for active silencing operate only inadequately. According to the invention, an arrangement is therefore described which avoids the disadvantages arising from the prior art. According to the invention, this is realised in that the exhaust gas pipe (10) opens into one of the two chambers of a double-chamber box (17) and a bass reflex pipe (21) projects into this chamber of the double-chamber box (17). The outstanding cancellation of sound at low loudspeaker power is effected by the cancellation of sound being carried out in the chamber of the box (17) into which the ends of the bass reflex pipe (21) and of the exhaust gas pipe (10) open, and by the beam axis S intersecting the centre line M at a distance A between the two pipes (10, 21) or in the pipe (21), and the length of separation L between partition (18) and centre line M being a maximum of 75% of the greatest diametral extent of the loudspeaker (12). <IMAGE>
IPC 1-7
IPC 8 full level
F01N 1/00 (2006.01); F01N 1/06 (2006.01); F16L 55/04 (2006.01); G10K 11/16 (2006.01); G10K 11/178 (2006.01)
CPC (source: EP US)
F01N 1/065 (2013.01 - EP US); G10K 11/17857 (2018.01 - EP US); G10K 11/1787 (2018.01 - EP US); F01N 2470/18 (2013.01 - EP US); G10K 2210/101 (2013.01 - EP US); G10K 2210/112 (2013.01 - EP US); G10K 2210/12822 (2013.01 - EP US); G10K 2210/32272 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE DK ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0657630 A1 19950614; EP 0657630 B1 19961002; AT E143715 T1 19961015; CA 2136293 A1 19950611; DE 4342133 A1 19950614; DE 59400768 D1 19961107; DK 0657630 T3 19970224; ES 2095124 T3 19970201; JP H07271381 A 19951020; US 5466899 A 19951114
DOCDB simple family (application)
EP 94118621 A 19941126; AT 94118621 T 19941126; CA 2136293 A 19941121; DE 4342133 A 19931210; DE 59400768 T 19941126; DK 94118621 T 19941126; ES 94118621 T 19941126; JP 30797194 A 19941212; US 34873994 A 19941202