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(11)

EP 1 373 689 A1

(12)

(43) Date of publication: 02.01.2004 Bulletin 2004/01 (21) Application number: 02711615.1 (22) Date of filing: 14.02.2002

(51) International Patent Classification (IPC)7: F01N 1/02, F01N 7/08 (86) International application number: PCT/SE2002/000260 (87) International publication number: WO 2002/066798 (29.08.2002 Gazette 2002/35)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 21.02.2001 SE 0100585 (71) Applicant: VOLVO LASTVAGNAR AB 405 08 Göteborg (SE)	(72) Inventors: WAHLSTRÖM, Gert-Ove S-436 45 Askim (SE) HENRIKSSON, Björn S-413 18 Göteborg (SE) (74) Representative: Fröhling, Werner et al Volvo Technology Corporation,Corporate Patents,06820, M1.7 405 08 Göteborg 405 08 Göteborg (SE)