(19)

(11)

EP 0 580 664 A1

(12)

(43) Date of publication: 02.02.1994 Bulletin 1994/05 (21) Application number: 92908203.0 (22) Date of filing: 15.04.1992

(51) International Patent Classification (IPC):  F01N 3/ 20( . ) F01N 7/ 02( . ) (86) International application number: PCT/GB1992/000690 (87) International publication number: WO 1992/018755 (29.10.1992 Gazette 1992/27)

(84) Designated Contracting States: DE FR GB (30) Priority: 15.04.1991 GB 19910007960 (71) Applicants: FORD-WERKE AKTIENGESELLSCHAFT D-50725 Köln (DE) FORD FRANCE S. A. F-92506 Rueil-Malmaison Cédex (FR) FORD MOTOR COMPANY LIMITED Brentwood, Essex CM13 3BW (GB)	(72) Inventor: MA, Thomas Tsoi-Hei Chelmsford CM3 5YB (GB) (74) Representative: Messulam, Alec Moses  A. Messulam & Co. 24 Broadway Leigh on Sea Essex SS9 1BN Leigh on Sea Essex SS9 1BN (GB)