Actively controlled induction noise using a multipole inlet

(19)

(11)

EP 1 085 198 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.11.2001 Bulletin 2001/45

(43)	Date of publication A2:
	21.03.2001 Bulletin 2001/12

(21)	Application number: 00119166.7

(22)	Date of filing: 05.09.2000

(51)	International Patent Classification (IPC)⁷: F02M 35/12

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

14.09.1999 US 153722 P

(71)	Applicant: SIEMENS CANADA LIMITED
	Tilbury, Ontario N0P 2LO (CA)

(72)	Inventor:
	McLean, Ian R Chatham, Ontario N7M 3V6 (CA)

(74)	Representative: Allen, Derek et al
	Siemens Shared Services Limited, Intellectual Property Department, Siemens House, Oldbury Bracknell, Berkshire RG12 8FZ Bracknell, Berkshire RG12 8FZ (GB)

(54)	Actively controlled induction noise using a multipole inlet

(57) An active noise attenuation assembly for an air induction system of an internal combustion engine is located in an air inlet duct leading to the engine. A fairing body is concentrically mounted within the duct and defines an annular space with the duct through which air travels. A loudspeaker is mounted on the fairing body facing outwardly from the duct. A controller generates an electrical signal amplified and phase shifted from a noise field emanating from the engine. The signal is applied to the loudspeaker for broadcasting a sound field phase shifted from the noise field for attenuating the noise field. A transition housing forms a first plurality of channels and a second plurality of channels. The housing mates to the outlet opening of the inlet duct. The first plurality of channels communicates with the loudspeaker and the second plurality of channels communicates with the annular space. The channels terminate at an end opposite the duct in a checkered pattern.

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