Combined active noise control and resonator

Abstract

A vehicle air supply noise attenuation system utilizes both active and passive methods of noise attenuation. A helmholtz resonator communicates with an air supply duct, and is designed to attenuate a narrow band of noise. An active noise control system, including a speaker and an electronic controller, is mounted within the resonator volume and attenuates noise over a wider band of frequencies. The combination of the active and passive noise control attenuates noise over a wide band of frequencies without requiring an overly large speaker.

What is claimed is:  
     
         1 . A vehicle air supply system comprising: 
 a duct for supplying air to a vehicle engine;    a resonator volume communicating with said duct, said resonator volume being designed to attenuate a noise emanating through said duct from a vehicle engine; and    an active noise control system including a controller and a speaker, said controller driving said speaker to attenuate engine noise over a wide band of frequencies.    
     
     
         2 . A vehicle air supply system as recited in  claim 1 , wherein said speaker is mounted within said resonator volume.  
     
     
         3 . An air supply system as set forth in  claim 1 , wherein said resonator is a helmholtz resonator having a narrow neck communicating said duct to an enlarged volume.  
     
     
         4 . A vehicle air supply system comprising: 
 a duct for supplying air to a vehicle engine;    a resonator volume communicating with said duct, said resonator volume being designed to attenuate a noise emanating through said duct from a vehicle engine; and    an active noise control system including a controller and a speaker, said controller driving said speaker to attenuate engine noise over a wide band of frequencies, said duct communicating an air cleaner to said vehicle engine through a throttle.    
     
     
         5 . A system as set forth in  claim 4 , wherein said helmholtz resonator is mounted between said air cleaner and said throttle body.  
     
     
         6 . A vehicle air supply system as recited in  claim 4 , wherein said speaker is mounted within said resonator volume.  
     
     
         7 . A vehicle air supply system comprising: 
 a duct for supplying air to a vehicle engine;    a helmholtz resonator having a narrow neck communicating said duct to an enlarged volume, said volume being designed to attenuate a noise passing through said duct from a vehicle engine;    an active noise control system including a controller and a speaker, said controller driving said speaker to attenuate engine noise over a wide band of frequencies;    said speaker being mounted within said resonator volume; and    an air cleaner mounted to provide air to said duct, and a throttle body, said resonator communicating with said duct intermediate said air cleaner and said throttle body.