(19)
(11) EP 0 997 616 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.01.2003 Bulletin 2003/04

(43) Date of publication A2:
03.05.2000 Bulletin 2000/18

(21) Application number: 99121232.5

(22) Date of filing: 23.10.1999
(51) International Patent Classification (IPC)7: F01N 3/027, F01N 3/023, F01N 3/029
(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: 27.10.1998 JP 30523298

(71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
St. Paul, Minnesota 55133-3427 (US)

(72) Inventor:
  • Ishikami, Yuji, c/o SUMITOMO 3M LIMITED
    Sagamihara-city, Kanagawa-Pref.229-1185 (JP)

(74) Representative: Hilleringmann, Jochen, Dipl.-Ing. et al
Patentanwälte von Kreisler-Selting-Werner, Bahnhofsvorplatz 1 (Deichmannhaus)
50667 Köln
50667 Köln (DE)

   


(54) Filter regenerating method and exhaust emission control device


(57) An additive agent is added to fuel, suction gas or exhaust gas, for lowering an ignition temperature of particulate matter contained in the exhaust gas. In a desired timing at which a pressure difference between the front and rear of a filter, arranged in an exhaust pipe, is increased due to the operation of an engine, an electric heater element of the filter is supplied with electric power of at least 2 kW for 10 to 80 seconds, to quickly burn the particulate matter having a lowered ignition temperature and captured by the filter. This regeneration method can be carried out in such a condition that the engine continuously operates and the exhaust gas containing the particulate matter constantly passes through the filter, without isolating the filter.






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