EP 0589516 A3 19950920 - SILENCER ARRANGEMENT FOR COMBUSTION ENGINES
Title (en)
SILENCER ARRANGEMENT FOR COMBUSTION ENGINES
Publication
Application
Priority
- EP 93202669 A 19930915
- EP 92202914 A 19920923
Abstract (en)
[origin: EP0589516A2] A silencer arrangement for a combustion engine (1) whose exhaust gases are discharged via a exhaust pipe (3) comprises a microphone (9), a tachometer (11) for the engine speed, a control unit (13) and a loudspeaker enclosure (19). The loudspeaker enclosure accommodates two loudspeakers (15, 17) secured to a partition (21). The partition divides the volume of the loudspeaker enclosure into two subvolumes (23, 25). The subvolumes communicate with one another via a tube (27) in order to reduce the electric power required to obtain the desired acoustic power of the sound emitted by the loudspeaker enclosure. One of the subvolumes (25) is acoustically coupled to a tube (33). One end (35) of the tube is situated near the end (7) of the exhaust pipe (3). The sound issuing from the loudspeaker enclosure via the tube interferes with the exhaust-gas sound. A Helmholtz resonator (41) is acoustically coupled to the tube (33) in order to suppress undesired resonances in the tube (33). The Helmholtz resonator contains such an amount of an acoustic damping material (43) in the form of glass wool or rock wool that the quality factor QHelmh. of the Helmholtz resonator lies between the values 1 and 3. <IMAGE>
IPC 1-7
IPC 8 full level
F01N 1/06 (2006.01); G10K 11/172 (2006.01)
CPC (source: EP)
F01N 1/065 (2013.01); G10K 11/172 (2013.01)
Citation (search report)
- [DA] EP 0429121 A1 19910529 - PHILIPS NV [NL]
- [DA] US 5025885 A 19910625 - FROESCHLE THOMAS A [US]
- [A] L.E. KINSLER & A.R. FREY: "Fundamentals of Acoustics", WILEY & SONS, NEW YORK, USA
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 93202669 A 19930915