Air intake system for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 35/12 (2006.01) F02M 35/14 (2006.01)

Patent

CA 2254138

The invention concern an air intake system for an internal combustion engine. The intaken air passes via an air filter (3) to the internal combustion engine. Within the intake passage an attenuation volume (5) is provided which acts as a Helmholtz resonator. The size of the attenuating volume is such that a given noise frequency range can be attenuated. To achieve optimum noise reduction at least a partial flow of air passes through the attenuation volume (5) and the size of the effective attenuation volume (5) through which the air passes can be varied by reversible switches and valves.

L'invention concerne un dispositif d'admission pour moteur à combustion interne, dans lequel l'air aspiré passe par un filtre à air (3) pour entrer dans le moteur à combustion interne. Dans la zone du trajet suivi par l'air aspiré, est disposé un volume d'atténuation (5) qui agit comme un résonateur de Helmholtz. La taille de ce volume d'atténuation est telle qu'un bruit compris dans une plage de fréquence donnée peut être atténué. Pour que la réduction du bruit soit optimale, au moins un flux partiel d'air passe par ce volume d'atténuation (5), et la taille du volume d'atténuation (5) efficace traversée par l'air peut subir des variations au moyen d'aiguillages et de clapets réversibles.

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