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(11)

EP 1 639 238 A1

(12)

(43) Date of publication: 29.03.2006 Bulletin 2006/13 (21) Application number: 04736821.2 (22) Date of filing: 14.06.2004

(51) International Patent Classification (IPC):  F01N 3/023(2000.01) (86) International application number: PCT/SE2004/000937 (87) International publication number: WO 2004/111399 (23.12.2004 Gazette 2004/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 18.06.2003 SE 0301799 (71) Applicant: VOLVO LASTVAGNAR AB 405 08 Göteborg (SE)	(72) Inventors: KARLSSON, Carl-Johan S-413 20 Göteborg (SE) TENGSTRÖM, Paulina S-436 39 Askim (SE) (74) Representative: Fröhling, Werner Otto et al Volvo Technology Corporation, Corporate Patents, 06820, M1.7 405 08 Göteborg 405 08 Göteborg (SE)